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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/ext4/super.c
4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 *
10 * from
11 *
12 * linux/fs/minix/inode.c
13 *
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 *
16 * Big-endian to little-endian byte-swapping/bitmaps by
17 * David S. Miller (davem@caip.rutgers.edu), 1995
18 */
19
20#include <linux/module.h>
21#include <linux/string.h>
22#include <linux/fs.h>
23#include <linux/time.h>
24#include <linux/vmalloc.h>
25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
28#include <linux/backing-dev.h>
29#include <linux/parser.h>
30#include <linux/buffer_head.h>
31#include <linux/exportfs.h>
32#include <linux/vfs.h>
33#include <linux/random.h>
34#include <linux/mount.h>
35#include <linux/namei.h>
36#include <linux/quotaops.h>
37#include <linux/seq_file.h>
38#include <linux/ctype.h>
39#include <linux/log2.h>
40#include <linux/crc16.h>
41#include <linux/dax.h>
42#include <linux/cleancache.h>
43#include <linux/uaccess.h>
44#include <linux/iversion.h>
45
46#include <linux/kthread.h>
47#include <linux/freezer.h>
48
49#include "ext4.h"
50#include "ext4_extents.h" /* Needed for trace points definition */
51#include "ext4_jbd2.h"
52#include "xattr.h"
53#include "acl.h"
54#include "mballoc.h"
55#include "fsmap.h"
56
57#define CREATE_TRACE_POINTS
58#include <trace/events/ext4.h>
59
60static struct ext4_lazy_init *ext4_li_info;
61static struct mutex ext4_li_mtx;
62static struct ratelimit_state ext4_mount_msg_ratelimit;
63
64static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
65 unsigned long journal_devnum);
66static int ext4_show_options(struct seq_file *seq, struct dentry *root);
67static int ext4_commit_super(struct super_block *sb, int sync);
68static void ext4_mark_recovery_complete(struct super_block *sb,
69 struct ext4_super_block *es);
70static void ext4_clear_journal_err(struct super_block *sb,
71 struct ext4_super_block *es);
72static int ext4_sync_fs(struct super_block *sb, int wait);
73static int ext4_remount(struct super_block *sb, int *flags, char *data);
74static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
75static int ext4_unfreeze(struct super_block *sb);
76static int ext4_freeze(struct super_block *sb);
77static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
78 const char *dev_name, void *data);
79static inline int ext2_feature_set_ok(struct super_block *sb);
80static inline int ext3_feature_set_ok(struct super_block *sb);
81static int ext4_feature_set_ok(struct super_block *sb, int readonly);
82static void ext4_destroy_lazyinit_thread(void);
83static void ext4_unregister_li_request(struct super_block *sb);
84static void ext4_clear_request_list(void);
85static struct inode *ext4_get_journal_inode(struct super_block *sb,
86 unsigned int journal_inum);
87
88/*
89 * Lock ordering
90 *
91 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
92 * i_mmap_rwsem (inode->i_mmap_rwsem)!
93 *
94 * page fault path:
95 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
96 * page lock -> i_data_sem (rw)
97 *
98 * buffered write path:
99 * sb_start_write -> i_mutex -> mmap_sem
100 * sb_start_write -> i_mutex -> transaction start -> page lock ->
101 * i_data_sem (rw)
102 *
103 * truncate:
104 * sb_start_write -> i_mutex -> i_mmap_sem (w) -> i_mmap_rwsem (w) -> page lock
105 * sb_start_write -> i_mutex -> i_mmap_sem (w) -> transaction start ->
106 * i_data_sem (rw)
107 *
108 * direct IO:
109 * sb_start_write -> i_mutex -> mmap_sem
110 * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw)
111 *
112 * writepages:
113 * transaction start -> page lock(s) -> i_data_sem (rw)
114 */
115
116#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
117static struct file_system_type ext2_fs_type = {
118 .owner = THIS_MODULE,
119 .name = "ext2",
120 .mount = ext4_mount,
121 .kill_sb = kill_block_super,
122 .fs_flags = FS_REQUIRES_DEV,
123};
124MODULE_ALIAS_FS("ext2");
125MODULE_ALIAS("ext2");
126#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
127#else
128#define IS_EXT2_SB(sb) (0)
129#endif
130
131
132static struct file_system_type ext3_fs_type = {
133 .owner = THIS_MODULE,
134 .name = "ext3",
135 .mount = ext4_mount,
136 .kill_sb = kill_block_super,
137 .fs_flags = FS_REQUIRES_DEV,
138};
139MODULE_ALIAS_FS("ext3");
140MODULE_ALIAS("ext3");
141#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
142
143static int ext4_verify_csum_type(struct super_block *sb,
144 struct ext4_super_block *es)
145{
146 if (!ext4_has_feature_metadata_csum(sb))
147 return 1;
148
149 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
150}
151
152static __le32 ext4_superblock_csum(struct super_block *sb,
153 struct ext4_super_block *es)
154{
155 struct ext4_sb_info *sbi = EXT4_SB(sb);
156 int offset = offsetof(struct ext4_super_block, s_checksum);
157 __u32 csum;
158
159 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
160
161 return cpu_to_le32(csum);
162}
163
164static int ext4_superblock_csum_verify(struct super_block *sb,
165 struct ext4_super_block *es)
166{
167 if (!ext4_has_metadata_csum(sb))
168 return 1;
169
170 return es->s_checksum == ext4_superblock_csum(sb, es);
171}
172
173void ext4_superblock_csum_set(struct super_block *sb)
174{
175 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
176
177 if (!ext4_has_metadata_csum(sb))
178 return;
179
180 es->s_checksum = ext4_superblock_csum(sb, es);
181}
182
183void *ext4_kvmalloc(size_t size, gfp_t flags)
184{
185 void *ret;
186
187 ret = kmalloc(size, flags | __GFP_NOWARN);
188 if (!ret)
189 ret = __vmalloc(size, flags, PAGE_KERNEL);
190 return ret;
191}
192
193void *ext4_kvzalloc(size_t size, gfp_t flags)
194{
195 void *ret;
196
197 ret = kzalloc(size, flags | __GFP_NOWARN);
198 if (!ret)
199 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
200 return ret;
201}
202
203ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
204 struct ext4_group_desc *bg)
205{
206 return le32_to_cpu(bg->bg_block_bitmap_lo) |
207 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
208 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
209}
210
211ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
212 struct ext4_group_desc *bg)
213{
214 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
215 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
216 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
217}
218
219ext4_fsblk_t ext4_inode_table(struct super_block *sb,
220 struct ext4_group_desc *bg)
221{
222 return le32_to_cpu(bg->bg_inode_table_lo) |
223 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
224 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
225}
226
227__u32 ext4_free_group_clusters(struct super_block *sb,
228 struct ext4_group_desc *bg)
229{
230 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
231 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
232 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
233}
234
235__u32 ext4_free_inodes_count(struct super_block *sb,
236 struct ext4_group_desc *bg)
237{
238 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
239 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
240 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
241}
242
243__u32 ext4_used_dirs_count(struct super_block *sb,
244 struct ext4_group_desc *bg)
245{
246 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
247 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
248 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
249}
250
251__u32 ext4_itable_unused_count(struct super_block *sb,
252 struct ext4_group_desc *bg)
253{
254 return le16_to_cpu(bg->bg_itable_unused_lo) |
255 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
256 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
257}
258
259void ext4_block_bitmap_set(struct super_block *sb,
260 struct ext4_group_desc *bg, ext4_fsblk_t blk)
261{
262 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
263 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
264 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
265}
266
267void ext4_inode_bitmap_set(struct super_block *sb,
268 struct ext4_group_desc *bg, ext4_fsblk_t blk)
269{
270 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
271 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
272 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
273}
274
275void ext4_inode_table_set(struct super_block *sb,
276 struct ext4_group_desc *bg, ext4_fsblk_t blk)
277{
278 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
279 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
280 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
281}
282
283void ext4_free_group_clusters_set(struct super_block *sb,
284 struct ext4_group_desc *bg, __u32 count)
285{
286 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
287 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
288 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
289}
290
291void ext4_free_inodes_set(struct super_block *sb,
292 struct ext4_group_desc *bg, __u32 count)
293{
294 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
295 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
296 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
297}
298
299void ext4_used_dirs_set(struct super_block *sb,
300 struct ext4_group_desc *bg, __u32 count)
301{
302 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
303 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
304 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
305}
306
307void ext4_itable_unused_set(struct super_block *sb,
308 struct ext4_group_desc *bg, __u32 count)
309{
310 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
311 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
312 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
313}
314
315
316static void __save_error_info(struct super_block *sb, const char *func,
317 unsigned int line)
318{
319 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
320
321 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
322 if (bdev_read_only(sb->s_bdev))
323 return;
324 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
325 es->s_last_error_time = cpu_to_le32(get_seconds());
326 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
327 es->s_last_error_line = cpu_to_le32(line);
328 if (!es->s_first_error_time) {
329 es->s_first_error_time = es->s_last_error_time;
330 strncpy(es->s_first_error_func, func,
331 sizeof(es->s_first_error_func));
332 es->s_first_error_line = cpu_to_le32(line);
333 es->s_first_error_ino = es->s_last_error_ino;
334 es->s_first_error_block = es->s_last_error_block;
335 }
336 /*
337 * Start the daily error reporting function if it hasn't been
338 * started already
339 */
340 if (!es->s_error_count)
341 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
342 le32_add_cpu(&es->s_error_count, 1);
343}
344
345static void save_error_info(struct super_block *sb, const char *func,
346 unsigned int line)
347{
348 __save_error_info(sb, func, line);
349 ext4_commit_super(sb, 1);
350}
351
352/*
353 * The del_gendisk() function uninitializes the disk-specific data
354 * structures, including the bdi structure, without telling anyone
355 * else. Once this happens, any attempt to call mark_buffer_dirty()
356 * (for example, by ext4_commit_super), will cause a kernel OOPS.
357 * This is a kludge to prevent these oops until we can put in a proper
358 * hook in del_gendisk() to inform the VFS and file system layers.
359 */
360static int block_device_ejected(struct super_block *sb)
361{
362 struct inode *bd_inode = sb->s_bdev->bd_inode;
363 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
364
365 return bdi->dev == NULL;
366}
367
368static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
369{
370 struct super_block *sb = journal->j_private;
371 struct ext4_sb_info *sbi = EXT4_SB(sb);
372 int error = is_journal_aborted(journal);
373 struct ext4_journal_cb_entry *jce;
374
375 BUG_ON(txn->t_state == T_FINISHED);
376
377 ext4_process_freed_data(sb, txn->t_tid);
378
379 spin_lock(&sbi->s_md_lock);
380 while (!list_empty(&txn->t_private_list)) {
381 jce = list_entry(txn->t_private_list.next,
382 struct ext4_journal_cb_entry, jce_list);
383 list_del_init(&jce->jce_list);
384 spin_unlock(&sbi->s_md_lock);
385 jce->jce_func(sb, jce, error);
386 spin_lock(&sbi->s_md_lock);
387 }
388 spin_unlock(&sbi->s_md_lock);
389}
390
391/* Deal with the reporting of failure conditions on a filesystem such as
392 * inconsistencies detected or read IO failures.
393 *
394 * On ext2, we can store the error state of the filesystem in the
395 * superblock. That is not possible on ext4, because we may have other
396 * write ordering constraints on the superblock which prevent us from
397 * writing it out straight away; and given that the journal is about to
398 * be aborted, we can't rely on the current, or future, transactions to
399 * write out the superblock safely.
400 *
401 * We'll just use the jbd2_journal_abort() error code to record an error in
402 * the journal instead. On recovery, the journal will complain about
403 * that error until we've noted it down and cleared it.
404 */
405
406static void ext4_handle_error(struct super_block *sb)
407{
408 if (sb_rdonly(sb))
409 return;
410
411 if (!test_opt(sb, ERRORS_CONT)) {
412 journal_t *journal = EXT4_SB(sb)->s_journal;
413
414 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
415 if (journal)
416 jbd2_journal_abort(journal, -EIO);
417 }
418 if (test_opt(sb, ERRORS_RO)) {
419 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
420 /*
421 * Make sure updated value of ->s_mount_flags will be visible
422 * before ->s_flags update
423 */
424 smp_wmb();
425 sb->s_flags |= SB_RDONLY;
426 }
427 if (test_opt(sb, ERRORS_PANIC)) {
428 if (EXT4_SB(sb)->s_journal &&
429 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
430 return;
431 panic("EXT4-fs (device %s): panic forced after error\n",
432 sb->s_id);
433 }
434}
435
436#define ext4_error_ratelimit(sb) \
437 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
438 "EXT4-fs error")
439
440void __ext4_error(struct super_block *sb, const char *function,
441 unsigned int line, const char *fmt, ...)
442{
443 struct va_format vaf;
444 va_list args;
445
446 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
447 return;
448
449 trace_ext4_error(sb, function, line);
450 if (ext4_error_ratelimit(sb)) {
451 va_start(args, fmt);
452 vaf.fmt = fmt;
453 vaf.va = &args;
454 printk(KERN_CRIT
455 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
456 sb->s_id, function, line, current->comm, &vaf);
457 va_end(args);
458 }
459 save_error_info(sb, function, line);
460 ext4_handle_error(sb);
461}
462
463void __ext4_error_inode(struct inode *inode, const char *function,
464 unsigned int line, ext4_fsblk_t block,
465 const char *fmt, ...)
466{
467 va_list args;
468 struct va_format vaf;
469 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
470
471 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
472 return;
473
474 trace_ext4_error(inode->i_sb, function, line);
475 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
476 es->s_last_error_block = cpu_to_le64(block);
477 if (ext4_error_ratelimit(inode->i_sb)) {
478 va_start(args, fmt);
479 vaf.fmt = fmt;
480 vaf.va = &args;
481 if (block)
482 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
483 "inode #%lu: block %llu: comm %s: %pV\n",
484 inode->i_sb->s_id, function, line, inode->i_ino,
485 block, current->comm, &vaf);
486 else
487 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
488 "inode #%lu: comm %s: %pV\n",
489 inode->i_sb->s_id, function, line, inode->i_ino,
490 current->comm, &vaf);
491 va_end(args);
492 }
493 save_error_info(inode->i_sb, function, line);
494 ext4_handle_error(inode->i_sb);
495}
496
497void __ext4_error_file(struct file *file, const char *function,
498 unsigned int line, ext4_fsblk_t block,
499 const char *fmt, ...)
500{
501 va_list args;
502 struct va_format vaf;
503 struct ext4_super_block *es;
504 struct inode *inode = file_inode(file);
505 char pathname[80], *path;
506
507 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
508 return;
509
510 trace_ext4_error(inode->i_sb, function, line);
511 es = EXT4_SB(inode->i_sb)->s_es;
512 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
513 if (ext4_error_ratelimit(inode->i_sb)) {
514 path = file_path(file, pathname, sizeof(pathname));
515 if (IS_ERR(path))
516 path = "(unknown)";
517 va_start(args, fmt);
518 vaf.fmt = fmt;
519 vaf.va = &args;
520 if (block)
521 printk(KERN_CRIT
522 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
523 "block %llu: comm %s: path %s: %pV\n",
524 inode->i_sb->s_id, function, line, inode->i_ino,
525 block, current->comm, path, &vaf);
526 else
527 printk(KERN_CRIT
528 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
529 "comm %s: path %s: %pV\n",
530 inode->i_sb->s_id, function, line, inode->i_ino,
531 current->comm, path, &vaf);
532 va_end(args);
533 }
534 save_error_info(inode->i_sb, function, line);
535 ext4_handle_error(inode->i_sb);
536}
537
538const char *ext4_decode_error(struct super_block *sb, int errno,
539 char nbuf[16])
540{
541 char *errstr = NULL;
542
543 switch (errno) {
544 case -EFSCORRUPTED:
545 errstr = "Corrupt filesystem";
546 break;
547 case -EFSBADCRC:
548 errstr = "Filesystem failed CRC";
549 break;
550 case -EIO:
551 errstr = "IO failure";
552 break;
553 case -ENOMEM:
554 errstr = "Out of memory";
555 break;
556 case -EROFS:
557 if (!sb || (EXT4_SB(sb)->s_journal &&
558 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
559 errstr = "Journal has aborted";
560 else
561 errstr = "Readonly filesystem";
562 break;
563 default:
564 /* If the caller passed in an extra buffer for unknown
565 * errors, textualise them now. Else we just return
566 * NULL. */
567 if (nbuf) {
568 /* Check for truncated error codes... */
569 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
570 errstr = nbuf;
571 }
572 break;
573 }
574
575 return errstr;
576}
577
578/* __ext4_std_error decodes expected errors from journaling functions
579 * automatically and invokes the appropriate error response. */
580
581void __ext4_std_error(struct super_block *sb, const char *function,
582 unsigned int line, int errno)
583{
584 char nbuf[16];
585 const char *errstr;
586
587 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
588 return;
589
590 /* Special case: if the error is EROFS, and we're not already
591 * inside a transaction, then there's really no point in logging
592 * an error. */
593 if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))
594 return;
595
596 if (ext4_error_ratelimit(sb)) {
597 errstr = ext4_decode_error(sb, errno, nbuf);
598 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
599 sb->s_id, function, line, errstr);
600 }
601
602 save_error_info(sb, function, line);
603 ext4_handle_error(sb);
604}
605
606/*
607 * ext4_abort is a much stronger failure handler than ext4_error. The
608 * abort function may be used to deal with unrecoverable failures such
609 * as journal IO errors or ENOMEM at a critical moment in log management.
610 *
611 * We unconditionally force the filesystem into an ABORT|READONLY state,
612 * unless the error response on the fs has been set to panic in which
613 * case we take the easy way out and panic immediately.
614 */
615
616void __ext4_abort(struct super_block *sb, const char *function,
617 unsigned int line, const char *fmt, ...)
618{
619 struct va_format vaf;
620 va_list args;
621
622 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
623 return;
624
625 save_error_info(sb, function, line);
626 va_start(args, fmt);
627 vaf.fmt = fmt;
628 vaf.va = &args;
629 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n",
630 sb->s_id, function, line, &vaf);
631 va_end(args);
632
633 if (sb_rdonly(sb) == 0) {
634 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
635 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
636 /*
637 * Make sure updated value of ->s_mount_flags will be visible
638 * before ->s_flags update
639 */
640 smp_wmb();
641 sb->s_flags |= SB_RDONLY;
642 if (EXT4_SB(sb)->s_journal)
643 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
644 save_error_info(sb, function, line);
645 }
646 if (test_opt(sb, ERRORS_PANIC)) {
647 if (EXT4_SB(sb)->s_journal &&
648 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
649 return;
650 panic("EXT4-fs panic from previous error\n");
651 }
652}
653
654void __ext4_msg(struct super_block *sb,
655 const char *prefix, const char *fmt, ...)
656{
657 struct va_format vaf;
658 va_list args;
659
660 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
661 return;
662
663 va_start(args, fmt);
664 vaf.fmt = fmt;
665 vaf.va = &args;
666 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
667 va_end(args);
668}
669
670#define ext4_warning_ratelimit(sb) \
671 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
672 "EXT4-fs warning")
673
674void __ext4_warning(struct super_block *sb, const char *function,
675 unsigned int line, const char *fmt, ...)
676{
677 struct va_format vaf;
678 va_list args;
679
680 if (!ext4_warning_ratelimit(sb))
681 return;
682
683 va_start(args, fmt);
684 vaf.fmt = fmt;
685 vaf.va = &args;
686 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
687 sb->s_id, function, line, &vaf);
688 va_end(args);
689}
690
691void __ext4_warning_inode(const struct inode *inode, const char *function,
692 unsigned int line, const char *fmt, ...)
693{
694 struct va_format vaf;
695 va_list args;
696
697 if (!ext4_warning_ratelimit(inode->i_sb))
698 return;
699
700 va_start(args, fmt);
701 vaf.fmt = fmt;
702 vaf.va = &args;
703 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
704 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
705 function, line, inode->i_ino, current->comm, &vaf);
706 va_end(args);
707}
708
709void __ext4_grp_locked_error(const char *function, unsigned int line,
710 struct super_block *sb, ext4_group_t grp,
711 unsigned long ino, ext4_fsblk_t block,
712 const char *fmt, ...)
713__releases(bitlock)
714__acquires(bitlock)
715{
716 struct va_format vaf;
717 va_list args;
718 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
719
720 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
721 return;
722
723 trace_ext4_error(sb, function, line);
724 es->s_last_error_ino = cpu_to_le32(ino);
725 es->s_last_error_block = cpu_to_le64(block);
726 __save_error_info(sb, function, line);
727
728 if (ext4_error_ratelimit(sb)) {
729 va_start(args, fmt);
730 vaf.fmt = fmt;
731 vaf.va = &args;
732 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
733 sb->s_id, function, line, grp);
734 if (ino)
735 printk(KERN_CONT "inode %lu: ", ino);
736 if (block)
737 printk(KERN_CONT "block %llu:",
738 (unsigned long long) block);
739 printk(KERN_CONT "%pV\n", &vaf);
740 va_end(args);
741 }
742
743 if (test_opt(sb, ERRORS_CONT)) {
744 ext4_commit_super(sb, 0);
745 return;
746 }
747
748 ext4_unlock_group(sb, grp);
749 ext4_commit_super(sb, 1);
750 ext4_handle_error(sb);
751 /*
752 * We only get here in the ERRORS_RO case; relocking the group
753 * may be dangerous, but nothing bad will happen since the
754 * filesystem will have already been marked read/only and the
755 * journal has been aborted. We return 1 as a hint to callers
756 * who might what to use the return value from
757 * ext4_grp_locked_error() to distinguish between the
758 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
759 * aggressively from the ext4 function in question, with a
760 * more appropriate error code.
761 */
762 ext4_lock_group(sb, grp);
763 return;
764}
765
766void ext4_update_dynamic_rev(struct super_block *sb)
767{
768 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
769
770 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
771 return;
772
773 ext4_warning(sb,
774 "updating to rev %d because of new feature flag, "
775 "running e2fsck is recommended",
776 EXT4_DYNAMIC_REV);
777
778 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
779 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
780 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
781 /* leave es->s_feature_*compat flags alone */
782 /* es->s_uuid will be set by e2fsck if empty */
783
784 /*
785 * The rest of the superblock fields should be zero, and if not it
786 * means they are likely already in use, so leave them alone. We
787 * can leave it up to e2fsck to clean up any inconsistencies there.
788 */
789}
790
791/*
792 * Open the external journal device
793 */
794static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
795{
796 struct block_device *bdev;
797 char b[BDEVNAME_SIZE];
798
799 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
800 if (IS_ERR(bdev))
801 goto fail;
802 return bdev;
803
804fail:
805 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
806 __bdevname(dev, b), PTR_ERR(bdev));
807 return NULL;
808}
809
810/*
811 * Release the journal device
812 */
813static void ext4_blkdev_put(struct block_device *bdev)
814{
815 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
816}
817
818static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
819{
820 struct block_device *bdev;
821 bdev = sbi->journal_bdev;
822 if (bdev) {
823 ext4_blkdev_put(bdev);
824 sbi->journal_bdev = NULL;
825 }
826}
827
828static inline struct inode *orphan_list_entry(struct list_head *l)
829{
830 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
831}
832
833static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
834{
835 struct list_head *l;
836
837 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
838 le32_to_cpu(sbi->s_es->s_last_orphan));
839
840 printk(KERN_ERR "sb_info orphan list:\n");
841 list_for_each(l, &sbi->s_orphan) {
842 struct inode *inode = orphan_list_entry(l);
843 printk(KERN_ERR " "
844 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
845 inode->i_sb->s_id, inode->i_ino, inode,
846 inode->i_mode, inode->i_nlink,
847 NEXT_ORPHAN(inode));
848 }
849}
850
851#ifdef CONFIG_QUOTA
852static int ext4_quota_off(struct super_block *sb, int type);
853
854static inline void ext4_quota_off_umount(struct super_block *sb)
855{
856 int type;
857
858 /* Use our quota_off function to clear inode flags etc. */
859 for (type = 0; type < EXT4_MAXQUOTAS; type++)
860 ext4_quota_off(sb, type);
861}
862#else
863static inline void ext4_quota_off_umount(struct super_block *sb)
864{
865}
866#endif
867
868static void ext4_put_super(struct super_block *sb)
869{
870 struct ext4_sb_info *sbi = EXT4_SB(sb);
871 struct ext4_super_block *es = sbi->s_es;
872 int aborted = 0;
873 int i, err;
874
875 ext4_unregister_li_request(sb);
876 ext4_quota_off_umount(sb);
877
878 destroy_workqueue(sbi->rsv_conversion_wq);
879
880 if (sbi->s_journal) {
881 aborted = is_journal_aborted(sbi->s_journal);
882 err = jbd2_journal_destroy(sbi->s_journal);
883 sbi->s_journal = NULL;
884 if ((err < 0) && !aborted)
885 ext4_abort(sb, "Couldn't clean up the journal");
886 }
887
888 ext4_unregister_sysfs(sb);
889 ext4_es_unregister_shrinker(sbi);
890 del_timer_sync(&sbi->s_err_report);
891 ext4_release_system_zone(sb);
892 ext4_mb_release(sb);
893 ext4_ext_release(sb);
894
895 if (!sb_rdonly(sb) && !aborted) {
896 ext4_clear_feature_journal_needs_recovery(sb);
897 es->s_state = cpu_to_le16(sbi->s_mount_state);
898 }
899 if (!sb_rdonly(sb))
900 ext4_commit_super(sb, 1);
901
902 for (i = 0; i < sbi->s_gdb_count; i++)
903 brelse(sbi->s_group_desc[i]);
904 kvfree(sbi->s_group_desc);
905 kvfree(sbi->s_flex_groups);
906 percpu_counter_destroy(&sbi->s_freeclusters_counter);
907 percpu_counter_destroy(&sbi->s_freeinodes_counter);
908 percpu_counter_destroy(&sbi->s_dirs_counter);
909 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
910 percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
911#ifdef CONFIG_QUOTA
912 for (i = 0; i < EXT4_MAXQUOTAS; i++)
913 kfree(sbi->s_qf_names[i]);
914#endif
915
916 /* Debugging code just in case the in-memory inode orphan list
917 * isn't empty. The on-disk one can be non-empty if we've
918 * detected an error and taken the fs readonly, but the
919 * in-memory list had better be clean by this point. */
920 if (!list_empty(&sbi->s_orphan))
921 dump_orphan_list(sb, sbi);
922 J_ASSERT(list_empty(&sbi->s_orphan));
923
924 sync_blockdev(sb->s_bdev);
925 invalidate_bdev(sb->s_bdev);
926 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
927 /*
928 * Invalidate the journal device's buffers. We don't want them
929 * floating about in memory - the physical journal device may
930 * hotswapped, and it breaks the `ro-after' testing code.
931 */
932 sync_blockdev(sbi->journal_bdev);
933 invalidate_bdev(sbi->journal_bdev);
934 ext4_blkdev_remove(sbi);
935 }
936 if (sbi->s_ea_inode_cache) {
937 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
938 sbi->s_ea_inode_cache = NULL;
939 }
940 if (sbi->s_ea_block_cache) {
941 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
942 sbi->s_ea_block_cache = NULL;
943 }
944 if (sbi->s_mmp_tsk)
945 kthread_stop(sbi->s_mmp_tsk);
946 brelse(sbi->s_sbh);
947 sb->s_fs_info = NULL;
948 /*
949 * Now that we are completely done shutting down the
950 * superblock, we need to actually destroy the kobject.
951 */
952 kobject_put(&sbi->s_kobj);
953 wait_for_completion(&sbi->s_kobj_unregister);
954 if (sbi->s_chksum_driver)
955 crypto_free_shash(sbi->s_chksum_driver);
956 kfree(sbi->s_blockgroup_lock);
957 fs_put_dax(sbi->s_daxdev);
958 kfree(sbi);
959}
960
961static struct kmem_cache *ext4_inode_cachep;
962
963/*
964 * Called inside transaction, so use GFP_NOFS
965 */
966static struct inode *ext4_alloc_inode(struct super_block *sb)
967{
968 struct ext4_inode_info *ei;
969
970 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
971 if (!ei)
972 return NULL;
973
974 inode_set_iversion(&ei->vfs_inode, 1);
975 spin_lock_init(&ei->i_raw_lock);
976 INIT_LIST_HEAD(&ei->i_prealloc_list);
977 spin_lock_init(&ei->i_prealloc_lock);
978 ext4_es_init_tree(&ei->i_es_tree);
979 rwlock_init(&ei->i_es_lock);
980 INIT_LIST_HEAD(&ei->i_es_list);
981 ei->i_es_all_nr = 0;
982 ei->i_es_shk_nr = 0;
983 ei->i_es_shrink_lblk = 0;
984 ei->i_reserved_data_blocks = 0;
985 ei->i_da_metadata_calc_len = 0;
986 ei->i_da_metadata_calc_last_lblock = 0;
987 spin_lock_init(&(ei->i_block_reservation_lock));
988#ifdef CONFIG_QUOTA
989 ei->i_reserved_quota = 0;
990 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
991#endif
992 ei->jinode = NULL;
993 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
994 spin_lock_init(&ei->i_completed_io_lock);
995 ei->i_sync_tid = 0;
996 ei->i_datasync_tid = 0;
997 atomic_set(&ei->i_unwritten, 0);
998 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
999 return &ei->vfs_inode;
1000}
1001
1002static int ext4_drop_inode(struct inode *inode)
1003{
1004 int drop = generic_drop_inode(inode);
1005
1006 trace_ext4_drop_inode(inode, drop);
1007 return drop;
1008}
1009
1010static void ext4_i_callback(struct rcu_head *head)
1011{
1012 struct inode *inode = container_of(head, struct inode, i_rcu);
1013 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1014}
1015
1016static void ext4_destroy_inode(struct inode *inode)
1017{
1018 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
1019 ext4_msg(inode->i_sb, KERN_ERR,
1020 "Inode %lu (%p): orphan list check failed!",
1021 inode->i_ino, EXT4_I(inode));
1022 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1023 EXT4_I(inode), sizeof(struct ext4_inode_info),
1024 true);
1025 dump_stack();
1026 }
1027 call_rcu(&inode->i_rcu, ext4_i_callback);
1028}
1029
1030static void init_once(void *foo)
1031{
1032 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
1033
1034 INIT_LIST_HEAD(&ei->i_orphan);
1035 init_rwsem(&ei->xattr_sem);
1036 init_rwsem(&ei->i_data_sem);
1037 init_rwsem(&ei->i_mmap_sem);
1038 inode_init_once(&ei->vfs_inode);
1039}
1040
1041static int __init init_inodecache(void)
1042{
1043 ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",
1044 sizeof(struct ext4_inode_info), 0,
1045 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
1046 SLAB_ACCOUNT),
1047 offsetof(struct ext4_inode_info, i_data),
1048 sizeof_field(struct ext4_inode_info, i_data),
1049 init_once);
1050 if (ext4_inode_cachep == NULL)
1051 return -ENOMEM;
1052 return 0;
1053}
1054
1055static void destroy_inodecache(void)
1056{
1057 /*
1058 * Make sure all delayed rcu free inodes are flushed before we
1059 * destroy cache.
1060 */
1061 rcu_barrier();
1062 kmem_cache_destroy(ext4_inode_cachep);
1063}
1064
1065void ext4_clear_inode(struct inode *inode)
1066{
1067 invalidate_inode_buffers(inode);
1068 clear_inode(inode);
1069 dquot_drop(inode);
1070 ext4_discard_preallocations(inode);
1071 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1072 if (EXT4_I(inode)->jinode) {
1073 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1074 EXT4_I(inode)->jinode);
1075 jbd2_free_inode(EXT4_I(inode)->jinode);
1076 EXT4_I(inode)->jinode = NULL;
1077 }
1078 fscrypt_put_encryption_info(inode);
1079}
1080
1081static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1082 u64 ino, u32 generation)
1083{
1084 struct inode *inode;
1085
1086 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1087 return ERR_PTR(-ESTALE);
1088 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1089 return ERR_PTR(-ESTALE);
1090
1091 /* iget isn't really right if the inode is currently unallocated!!
1092 *
1093 * ext4_read_inode will return a bad_inode if the inode had been
1094 * deleted, so we should be safe.
1095 *
1096 * Currently we don't know the generation for parent directory, so
1097 * a generation of 0 means "accept any"
1098 */
1099 inode = ext4_iget_normal(sb, ino);
1100 if (IS_ERR(inode))
1101 return ERR_CAST(inode);
1102 if (generation && inode->i_generation != generation) {
1103 iput(inode);
1104 return ERR_PTR(-ESTALE);
1105 }
1106
1107 return inode;
1108}
1109
1110static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1111 int fh_len, int fh_type)
1112{
1113 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1114 ext4_nfs_get_inode);
1115}
1116
1117static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1118 int fh_len, int fh_type)
1119{
1120 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1121 ext4_nfs_get_inode);
1122}
1123
1124/*
1125 * Try to release metadata pages (indirect blocks, directories) which are
1126 * mapped via the block device. Since these pages could have journal heads
1127 * which would prevent try_to_free_buffers() from freeing them, we must use
1128 * jbd2 layer's try_to_free_buffers() function to release them.
1129 */
1130static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1131 gfp_t wait)
1132{
1133 journal_t *journal = EXT4_SB(sb)->s_journal;
1134
1135 WARN_ON(PageChecked(page));
1136 if (!page_has_buffers(page))
1137 return 0;
1138 if (journal)
1139 return jbd2_journal_try_to_free_buffers(journal, page,
1140 wait & ~__GFP_DIRECT_RECLAIM);
1141 return try_to_free_buffers(page);
1142}
1143
1144#ifdef CONFIG_EXT4_FS_ENCRYPTION
1145static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
1146{
1147 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1148 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
1149}
1150
1151static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
1152 void *fs_data)
1153{
1154 handle_t *handle = fs_data;
1155 int res, res2, credits, retries = 0;
1156
1157 /*
1158 * Encrypting the root directory is not allowed because e2fsck expects
1159 * lost+found to exist and be unencrypted, and encrypting the root
1160 * directory would imply encrypting the lost+found directory as well as
1161 * the filename "lost+found" itself.
1162 */
1163 if (inode->i_ino == EXT4_ROOT_INO)
1164 return -EPERM;
1165
1166 if (WARN_ON_ONCE(IS_DAX(inode) && i_size_read(inode)))
1167 return -EINVAL;
1168
1169 res = ext4_convert_inline_data(inode);
1170 if (res)
1171 return res;
1172
1173 /*
1174 * If a journal handle was specified, then the encryption context is
1175 * being set on a new inode via inheritance and is part of a larger
1176 * transaction to create the inode. Otherwise the encryption context is
1177 * being set on an existing inode in its own transaction. Only in the
1178 * latter case should the "retry on ENOSPC" logic be used.
1179 */
1180
1181 if (handle) {
1182 res = ext4_xattr_set_handle(handle, inode,
1183 EXT4_XATTR_INDEX_ENCRYPTION,
1184 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1185 ctx, len, 0);
1186 if (!res) {
1187 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1188 ext4_clear_inode_state(inode,
1189 EXT4_STATE_MAY_INLINE_DATA);
1190 /*
1191 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1192 * S_DAX may be disabled
1193 */
1194 ext4_set_inode_flags(inode);
1195 }
1196 return res;
1197 }
1198
1199 res = dquot_initialize(inode);
1200 if (res)
1201 return res;
1202retry:
1203 res = ext4_xattr_set_credits(inode, len, false /* is_create */,
1204 &credits);
1205 if (res)
1206 return res;
1207
1208 handle = ext4_journal_start(inode, EXT4_HT_MISC, credits);
1209 if (IS_ERR(handle))
1210 return PTR_ERR(handle);
1211
1212 res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION,
1213 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1214 ctx, len, 0);
1215 if (!res) {
1216 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1217 /*
1218 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1219 * S_DAX may be disabled
1220 */
1221 ext4_set_inode_flags(inode);
1222 res = ext4_mark_inode_dirty(handle, inode);
1223 if (res)
1224 EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
1225 }
1226 res2 = ext4_journal_stop(handle);
1227
1228 if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
1229 goto retry;
1230 if (!res)
1231 res = res2;
1232 return res;
1233}
1234
1235static bool ext4_dummy_context(struct inode *inode)
1236{
1237 return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode->i_sb));
1238}
1239
1240static unsigned ext4_max_namelen(struct inode *inode)
1241{
1242 return S_ISLNK(inode->i_mode) ? inode->i_sb->s_blocksize :
1243 EXT4_NAME_LEN;
1244}
1245
1246static const struct fscrypt_operations ext4_cryptops = {
1247 .key_prefix = "ext4:",
1248 .get_context = ext4_get_context,
1249 .set_context = ext4_set_context,
1250 .dummy_context = ext4_dummy_context,
1251 .empty_dir = ext4_empty_dir,
1252 .max_namelen = ext4_max_namelen,
1253};
1254#endif
1255
1256#ifdef CONFIG_QUOTA
1257static const char * const quotatypes[] = INITQFNAMES;
1258#define QTYPE2NAME(t) (quotatypes[t])
1259
1260static int ext4_write_dquot(struct dquot *dquot);
1261static int ext4_acquire_dquot(struct dquot *dquot);
1262static int ext4_release_dquot(struct dquot *dquot);
1263static int ext4_mark_dquot_dirty(struct dquot *dquot);
1264static int ext4_write_info(struct super_block *sb, int type);
1265static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1266 const struct path *path);
1267static int ext4_quota_on_mount(struct super_block *sb, int type);
1268static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1269 size_t len, loff_t off);
1270static ssize_t ext4_quota_write(struct super_block *sb, int type,
1271 const char *data, size_t len, loff_t off);
1272static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1273 unsigned int flags);
1274static int ext4_enable_quotas(struct super_block *sb);
1275static int ext4_get_next_id(struct super_block *sb, struct kqid *qid);
1276
1277static struct dquot **ext4_get_dquots(struct inode *inode)
1278{
1279 return EXT4_I(inode)->i_dquot;
1280}
1281
1282static const struct dquot_operations ext4_quota_operations = {
1283 .get_reserved_space = ext4_get_reserved_space,
1284 .write_dquot = ext4_write_dquot,
1285 .acquire_dquot = ext4_acquire_dquot,
1286 .release_dquot = ext4_release_dquot,
1287 .mark_dirty = ext4_mark_dquot_dirty,
1288 .write_info = ext4_write_info,
1289 .alloc_dquot = dquot_alloc,
1290 .destroy_dquot = dquot_destroy,
1291 .get_projid = ext4_get_projid,
1292 .get_inode_usage = ext4_get_inode_usage,
1293 .get_next_id = ext4_get_next_id,
1294};
1295
1296static const struct quotactl_ops ext4_qctl_operations = {
1297 .quota_on = ext4_quota_on,
1298 .quota_off = ext4_quota_off,
1299 .quota_sync = dquot_quota_sync,
1300 .get_state = dquot_get_state,
1301 .set_info = dquot_set_dqinfo,
1302 .get_dqblk = dquot_get_dqblk,
1303 .set_dqblk = dquot_set_dqblk,
1304 .get_nextdqblk = dquot_get_next_dqblk,
1305};
1306#endif
1307
1308static const struct super_operations ext4_sops = {
1309 .alloc_inode = ext4_alloc_inode,
1310 .destroy_inode = ext4_destroy_inode,
1311 .write_inode = ext4_write_inode,
1312 .dirty_inode = ext4_dirty_inode,
1313 .drop_inode = ext4_drop_inode,
1314 .evict_inode = ext4_evict_inode,
1315 .put_super = ext4_put_super,
1316 .sync_fs = ext4_sync_fs,
1317 .freeze_fs = ext4_freeze,
1318 .unfreeze_fs = ext4_unfreeze,
1319 .statfs = ext4_statfs,
1320 .remount_fs = ext4_remount,
1321 .show_options = ext4_show_options,
1322#ifdef CONFIG_QUOTA
1323 .quota_read = ext4_quota_read,
1324 .quota_write = ext4_quota_write,
1325 .get_dquots = ext4_get_dquots,
1326#endif
1327 .bdev_try_to_free_page = bdev_try_to_free_page,
1328};
1329
1330static const struct export_operations ext4_export_ops = {
1331 .fh_to_dentry = ext4_fh_to_dentry,
1332 .fh_to_parent = ext4_fh_to_parent,
1333 .get_parent = ext4_get_parent,
1334};
1335
1336enum {
1337 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1338 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1339 Opt_nouid32, Opt_debug, Opt_removed,
1340 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1341 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1342 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1343 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1344 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1345 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
1346 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1347 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1348 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1349 Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax,
1350 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1351 Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize,
1352 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1353 Opt_inode_readahead_blks, Opt_journal_ioprio,
1354 Opt_dioread_nolock, Opt_dioread_lock,
1355 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1356 Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
1357};
1358
1359static const match_table_t tokens = {
1360 {Opt_bsd_df, "bsddf"},
1361 {Opt_minix_df, "minixdf"},
1362 {Opt_grpid, "grpid"},
1363 {Opt_grpid, "bsdgroups"},
1364 {Opt_nogrpid, "nogrpid"},
1365 {Opt_nogrpid, "sysvgroups"},
1366 {Opt_resgid, "resgid=%u"},
1367 {Opt_resuid, "resuid=%u"},
1368 {Opt_sb, "sb=%u"},
1369 {Opt_err_cont, "errors=continue"},
1370 {Opt_err_panic, "errors=panic"},
1371 {Opt_err_ro, "errors=remount-ro"},
1372 {Opt_nouid32, "nouid32"},
1373 {Opt_debug, "debug"},
1374 {Opt_removed, "oldalloc"},
1375 {Opt_removed, "orlov"},
1376 {Opt_user_xattr, "user_xattr"},
1377 {Opt_nouser_xattr, "nouser_xattr"},
1378 {Opt_acl, "acl"},
1379 {Opt_noacl, "noacl"},
1380 {Opt_noload, "norecovery"},
1381 {Opt_noload, "noload"},
1382 {Opt_removed, "nobh"},
1383 {Opt_removed, "bh"},
1384 {Opt_commit, "commit=%u"},
1385 {Opt_min_batch_time, "min_batch_time=%u"},
1386 {Opt_max_batch_time, "max_batch_time=%u"},
1387 {Opt_journal_dev, "journal_dev=%u"},
1388 {Opt_journal_path, "journal_path=%s"},
1389 {Opt_journal_checksum, "journal_checksum"},
1390 {Opt_nojournal_checksum, "nojournal_checksum"},
1391 {Opt_journal_async_commit, "journal_async_commit"},
1392 {Opt_abort, "abort"},
1393 {Opt_data_journal, "data=journal"},
1394 {Opt_data_ordered, "data=ordered"},
1395 {Opt_data_writeback, "data=writeback"},
1396 {Opt_data_err_abort, "data_err=abort"},
1397 {Opt_data_err_ignore, "data_err=ignore"},
1398 {Opt_offusrjquota, "usrjquota="},
1399 {Opt_usrjquota, "usrjquota=%s"},
1400 {Opt_offgrpjquota, "grpjquota="},
1401 {Opt_grpjquota, "grpjquota=%s"},
1402 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1403 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1404 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1405 {Opt_grpquota, "grpquota"},
1406 {Opt_noquota, "noquota"},
1407 {Opt_quota, "quota"},
1408 {Opt_usrquota, "usrquota"},
1409 {Opt_prjquota, "prjquota"},
1410 {Opt_barrier, "barrier=%u"},
1411 {Opt_barrier, "barrier"},
1412 {Opt_nobarrier, "nobarrier"},
1413 {Opt_i_version, "i_version"},
1414 {Opt_dax, "dax"},
1415 {Opt_stripe, "stripe=%u"},
1416 {Opt_delalloc, "delalloc"},
1417 {Opt_lazytime, "lazytime"},
1418 {Opt_nolazytime, "nolazytime"},
1419 {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"},
1420 {Opt_nodelalloc, "nodelalloc"},
1421 {Opt_removed, "mblk_io_submit"},
1422 {Opt_removed, "nomblk_io_submit"},
1423 {Opt_block_validity, "block_validity"},
1424 {Opt_noblock_validity, "noblock_validity"},
1425 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1426 {Opt_journal_ioprio, "journal_ioprio=%u"},
1427 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1428 {Opt_auto_da_alloc, "auto_da_alloc"},
1429 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1430 {Opt_dioread_nolock, "dioread_nolock"},
1431 {Opt_dioread_lock, "dioread_lock"},
1432 {Opt_discard, "discard"},
1433 {Opt_nodiscard, "nodiscard"},
1434 {Opt_init_itable, "init_itable=%u"},
1435 {Opt_init_itable, "init_itable"},
1436 {Opt_noinit_itable, "noinit_itable"},
1437 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1438 {Opt_test_dummy_encryption, "test_dummy_encryption"},
1439 {Opt_nombcache, "nombcache"},
1440 {Opt_nombcache, "no_mbcache"}, /* for backward compatibility */
1441 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1442 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1443 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1444 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1445 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
1446 {Opt_err, NULL},
1447};
1448
1449static ext4_fsblk_t get_sb_block(void **data)
1450{
1451 ext4_fsblk_t sb_block;
1452 char *options = (char *) *data;
1453
1454 if (!options || strncmp(options, "sb=", 3) != 0)
1455 return 1; /* Default location */
1456
1457 options += 3;
1458 /* TODO: use simple_strtoll with >32bit ext4 */
1459 sb_block = simple_strtoul(options, &options, 0);
1460 if (*options && *options != ',') {
1461 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1462 (char *) *data);
1463 return 1;
1464 }
1465 if (*options == ',')
1466 options++;
1467 *data = (void *) options;
1468
1469 return sb_block;
1470}
1471
1472#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1473static const char deprecated_msg[] =
1474 "Mount option \"%s\" will be removed by %s\n"
1475 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1476
1477#ifdef CONFIG_QUOTA
1478static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1479{
1480 struct ext4_sb_info *sbi = EXT4_SB(sb);
1481 char *qname;
1482 int ret = -1;
1483
1484 if (sb_any_quota_loaded(sb) &&
1485 !sbi->s_qf_names[qtype]) {
1486 ext4_msg(sb, KERN_ERR,
1487 "Cannot change journaled "
1488 "quota options when quota turned on");
1489 return -1;
1490 }
1491 if (ext4_has_feature_quota(sb)) {
1492 ext4_msg(sb, KERN_INFO, "Journaled quota options "
1493 "ignored when QUOTA feature is enabled");
1494 return 1;
1495 }
1496 qname = match_strdup(args);
1497 if (!qname) {
1498 ext4_msg(sb, KERN_ERR,
1499 "Not enough memory for storing quotafile name");
1500 return -1;
1501 }
1502 if (sbi->s_qf_names[qtype]) {
1503 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1504 ret = 1;
1505 else
1506 ext4_msg(sb, KERN_ERR,
1507 "%s quota file already specified",
1508 QTYPE2NAME(qtype));
1509 goto errout;
1510 }
1511 if (strchr(qname, '/')) {
1512 ext4_msg(sb, KERN_ERR,
1513 "quotafile must be on filesystem root");
1514 goto errout;
1515 }
1516 sbi->s_qf_names[qtype] = qname;
1517 set_opt(sb, QUOTA);
1518 return 1;
1519errout:
1520 kfree(qname);
1521 return ret;
1522}
1523
1524static int clear_qf_name(struct super_block *sb, int qtype)
1525{
1526
1527 struct ext4_sb_info *sbi = EXT4_SB(sb);
1528
1529 if (sb_any_quota_loaded(sb) &&
1530 sbi->s_qf_names[qtype]) {
1531 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1532 " when quota turned on");
1533 return -1;
1534 }
1535 kfree(sbi->s_qf_names[qtype]);
1536 sbi->s_qf_names[qtype] = NULL;
1537 return 1;
1538}
1539#endif
1540
1541#define MOPT_SET 0x0001
1542#define MOPT_CLEAR 0x0002
1543#define MOPT_NOSUPPORT 0x0004
1544#define MOPT_EXPLICIT 0x0008
1545#define MOPT_CLEAR_ERR 0x0010
1546#define MOPT_GTE0 0x0020
1547#ifdef CONFIG_QUOTA
1548#define MOPT_Q 0
1549#define MOPT_QFMT 0x0040
1550#else
1551#define MOPT_Q MOPT_NOSUPPORT
1552#define MOPT_QFMT MOPT_NOSUPPORT
1553#endif
1554#define MOPT_DATAJ 0x0080
1555#define MOPT_NO_EXT2 0x0100
1556#define MOPT_NO_EXT3 0x0200
1557#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1558#define MOPT_STRING 0x0400
1559
1560static const struct mount_opts {
1561 int token;
1562 int mount_opt;
1563 int flags;
1564} ext4_mount_opts[] = {
1565 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1566 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1567 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1568 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1569 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1570 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1571 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1572 MOPT_EXT4_ONLY | MOPT_SET},
1573 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1574 MOPT_EXT4_ONLY | MOPT_CLEAR},
1575 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1576 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1577 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1578 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1579 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1580 MOPT_EXT4_ONLY | MOPT_CLEAR},
1581 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1582 MOPT_EXT4_ONLY | MOPT_CLEAR},
1583 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1584 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1585 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1586 EXT4_MOUNT_JOURNAL_CHECKSUM),
1587 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1588 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1589 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1590 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1591 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1592 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1593 MOPT_NO_EXT2},
1594 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1595 MOPT_NO_EXT2},
1596 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1597 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1598 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1599 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1600 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1601 {Opt_commit, 0, MOPT_GTE0},
1602 {Opt_max_batch_time, 0, MOPT_GTE0},
1603 {Opt_min_batch_time, 0, MOPT_GTE0},
1604 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1605 {Opt_init_itable, 0, MOPT_GTE0},
1606 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
1607 {Opt_stripe, 0, MOPT_GTE0},
1608 {Opt_resuid, 0, MOPT_GTE0},
1609 {Opt_resgid, 0, MOPT_GTE0},
1610 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1611 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1612 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1613 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1614 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1615 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1616 MOPT_NO_EXT2 | MOPT_DATAJ},
1617 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1618 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
1619#ifdef CONFIG_EXT4_FS_POSIX_ACL
1620 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1621 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1622#else
1623 {Opt_acl, 0, MOPT_NOSUPPORT},
1624 {Opt_noacl, 0, MOPT_NOSUPPORT},
1625#endif
1626 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1627 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1628 {Opt_debug_want_extra_isize, 0, MOPT_GTE0},
1629 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1630 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1631 MOPT_SET | MOPT_Q},
1632 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1633 MOPT_SET | MOPT_Q},
1634 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1635 MOPT_SET | MOPT_Q},
1636 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1637 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1638 MOPT_CLEAR | MOPT_Q},
1639 {Opt_usrjquota, 0, MOPT_Q},
1640 {Opt_grpjquota, 0, MOPT_Q},
1641 {Opt_offusrjquota, 0, MOPT_Q},
1642 {Opt_offgrpjquota, 0, MOPT_Q},
1643 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1644 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1645 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1646 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
1647 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
1648 {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
1649 {Opt_err, 0, 0}
1650};
1651
1652static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1653 substring_t *args, unsigned long *journal_devnum,
1654 unsigned int *journal_ioprio, int is_remount)
1655{
1656 struct ext4_sb_info *sbi = EXT4_SB(sb);
1657 const struct mount_opts *m;
1658 kuid_t uid;
1659 kgid_t gid;
1660 int arg = 0;
1661
1662#ifdef CONFIG_QUOTA
1663 if (token == Opt_usrjquota)
1664 return set_qf_name(sb, USRQUOTA, &args[0]);
1665 else if (token == Opt_grpjquota)
1666 return set_qf_name(sb, GRPQUOTA, &args[0]);
1667 else if (token == Opt_offusrjquota)
1668 return clear_qf_name(sb, USRQUOTA);
1669 else if (token == Opt_offgrpjquota)
1670 return clear_qf_name(sb, GRPQUOTA);
1671#endif
1672 switch (token) {
1673 case Opt_noacl:
1674 case Opt_nouser_xattr:
1675 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1676 break;
1677 case Opt_sb:
1678 return 1; /* handled by get_sb_block() */
1679 case Opt_removed:
1680 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1681 return 1;
1682 case Opt_abort:
1683 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1684 return 1;
1685 case Opt_i_version:
1686 sb->s_flags |= SB_I_VERSION;
1687 return 1;
1688 case Opt_lazytime:
1689 sb->s_flags |= SB_LAZYTIME;
1690 return 1;
1691 case Opt_nolazytime:
1692 sb->s_flags &= ~SB_LAZYTIME;
1693 return 1;
1694 }
1695
1696 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1697 if (token == m->token)
1698 break;
1699
1700 if (m->token == Opt_err) {
1701 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1702 "or missing value", opt);
1703 return -1;
1704 }
1705
1706 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1707 ext4_msg(sb, KERN_ERR,
1708 "Mount option \"%s\" incompatible with ext2", opt);
1709 return -1;
1710 }
1711 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1712 ext4_msg(sb, KERN_ERR,
1713 "Mount option \"%s\" incompatible with ext3", opt);
1714 return -1;
1715 }
1716
1717 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
1718 return -1;
1719 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1720 return -1;
1721 if (m->flags & MOPT_EXPLICIT) {
1722 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1723 set_opt2(sb, EXPLICIT_DELALLOC);
1724 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1725 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
1726 } else
1727 return -1;
1728 }
1729 if (m->flags & MOPT_CLEAR_ERR)
1730 clear_opt(sb, ERRORS_MASK);
1731 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1732 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1733 "options when quota turned on");
1734 return -1;
1735 }
1736
1737 if (m->flags & MOPT_NOSUPPORT) {
1738 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1739 } else if (token == Opt_commit) {
1740 if (arg == 0)
1741 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1742 sbi->s_commit_interval = HZ * arg;
1743 } else if (token == Opt_debug_want_extra_isize) {
1744 sbi->s_want_extra_isize = arg;
1745 } else if (token == Opt_max_batch_time) {
1746 sbi->s_max_batch_time = arg;
1747 } else if (token == Opt_min_batch_time) {
1748 sbi->s_min_batch_time = arg;
1749 } else if (token == Opt_inode_readahead_blks) {
1750 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1751 ext4_msg(sb, KERN_ERR,
1752 "EXT4-fs: inode_readahead_blks must be "
1753 "0 or a power of 2 smaller than 2^31");
1754 return -1;
1755 }
1756 sbi->s_inode_readahead_blks = arg;
1757 } else if (token == Opt_init_itable) {
1758 set_opt(sb, INIT_INODE_TABLE);
1759 if (!args->from)
1760 arg = EXT4_DEF_LI_WAIT_MULT;
1761 sbi->s_li_wait_mult = arg;
1762 } else if (token == Opt_max_dir_size_kb) {
1763 sbi->s_max_dir_size_kb = arg;
1764 } else if (token == Opt_stripe) {
1765 sbi->s_stripe = arg;
1766 } else if (token == Opt_resuid) {
1767 uid = make_kuid(current_user_ns(), arg);
1768 if (!uid_valid(uid)) {
1769 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1770 return -1;
1771 }
1772 sbi->s_resuid = uid;
1773 } else if (token == Opt_resgid) {
1774 gid = make_kgid(current_user_ns(), arg);
1775 if (!gid_valid(gid)) {
1776 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1777 return -1;
1778 }
1779 sbi->s_resgid = gid;
1780 } else if (token == Opt_journal_dev) {
1781 if (is_remount) {
1782 ext4_msg(sb, KERN_ERR,
1783 "Cannot specify journal on remount");
1784 return -1;
1785 }
1786 *journal_devnum = arg;
1787 } else if (token == Opt_journal_path) {
1788 char *journal_path;
1789 struct inode *journal_inode;
1790 struct path path;
1791 int error;
1792
1793 if (is_remount) {
1794 ext4_msg(sb, KERN_ERR,
1795 "Cannot specify journal on remount");
1796 return -1;
1797 }
1798 journal_path = match_strdup(&args[0]);
1799 if (!journal_path) {
1800 ext4_msg(sb, KERN_ERR, "error: could not dup "
1801 "journal device string");
1802 return -1;
1803 }
1804
1805 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1806 if (error) {
1807 ext4_msg(sb, KERN_ERR, "error: could not find "
1808 "journal device path: error %d", error);
1809 kfree(journal_path);
1810 return -1;
1811 }
1812
1813 journal_inode = d_inode(path.dentry);
1814 if (!S_ISBLK(journal_inode->i_mode)) {
1815 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1816 "is not a block device", journal_path);
1817 path_put(&path);
1818 kfree(journal_path);
1819 return -1;
1820 }
1821
1822 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1823 path_put(&path);
1824 kfree(journal_path);
1825 } else if (token == Opt_journal_ioprio) {
1826 if (arg > 7) {
1827 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1828 " (must be 0-7)");
1829 return -1;
1830 }
1831 *journal_ioprio =
1832 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1833 } else if (token == Opt_test_dummy_encryption) {
1834#ifdef CONFIG_EXT4_FS_ENCRYPTION
1835 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1836 ext4_msg(sb, KERN_WARNING,
1837 "Test dummy encryption mode enabled");
1838#else
1839 ext4_msg(sb, KERN_WARNING,
1840 "Test dummy encryption mount option ignored");
1841#endif
1842 } else if (m->flags & MOPT_DATAJ) {
1843 if (is_remount) {
1844 if (!sbi->s_journal)
1845 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1846 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
1847 ext4_msg(sb, KERN_ERR,
1848 "Cannot change data mode on remount");
1849 return -1;
1850 }
1851 } else {
1852 clear_opt(sb, DATA_FLAGS);
1853 sbi->s_mount_opt |= m->mount_opt;
1854 }
1855#ifdef CONFIG_QUOTA
1856 } else if (m->flags & MOPT_QFMT) {
1857 if (sb_any_quota_loaded(sb) &&
1858 sbi->s_jquota_fmt != m->mount_opt) {
1859 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1860 "quota options when quota turned on");
1861 return -1;
1862 }
1863 if (ext4_has_feature_quota(sb)) {
1864 ext4_msg(sb, KERN_INFO,
1865 "Quota format mount options ignored "
1866 "when QUOTA feature is enabled");
1867 return 1;
1868 }
1869 sbi->s_jquota_fmt = m->mount_opt;
1870#endif
1871 } else if (token == Opt_dax) {
1872#ifdef CONFIG_FS_DAX
1873 ext4_msg(sb, KERN_WARNING,
1874 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1875 sbi->s_mount_opt |= m->mount_opt;
1876#else
1877 ext4_msg(sb, KERN_INFO, "dax option not supported");
1878 return -1;
1879#endif
1880 } else if (token == Opt_data_err_abort) {
1881 sbi->s_mount_opt |= m->mount_opt;
1882 } else if (token == Opt_data_err_ignore) {
1883 sbi->s_mount_opt &= ~m->mount_opt;
1884 } else {
1885 if (!args->from)
1886 arg = 1;
1887 if (m->flags & MOPT_CLEAR)
1888 arg = !arg;
1889 else if (unlikely(!(m->flags & MOPT_SET))) {
1890 ext4_msg(sb, KERN_WARNING,
1891 "buggy handling of option %s", opt);
1892 WARN_ON(1);
1893 return -1;
1894 }
1895 if (arg != 0)
1896 sbi->s_mount_opt |= m->mount_opt;
1897 else
1898 sbi->s_mount_opt &= ~m->mount_opt;
1899 }
1900 return 1;
1901}
1902
1903static int parse_options(char *options, struct super_block *sb,
1904 unsigned long *journal_devnum,
1905 unsigned int *journal_ioprio,
1906 int is_remount)
1907{
1908 struct ext4_sb_info *sbi = EXT4_SB(sb);
1909 char *p;
1910 substring_t args[MAX_OPT_ARGS];
1911 int token;
1912
1913 if (!options)
1914 return 1;
1915
1916 while ((p = strsep(&options, ",")) != NULL) {
1917 if (!*p)
1918 continue;
1919 /*
1920 * Initialize args struct so we know whether arg was
1921 * found; some options take optional arguments.
1922 */
1923 args[0].to = args[0].from = NULL;
1924 token = match_token(p, tokens, args);
1925 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1926 journal_ioprio, is_remount) < 0)
1927 return 0;
1928 }
1929#ifdef CONFIG_QUOTA
1930 /*
1931 * We do the test below only for project quotas. 'usrquota' and
1932 * 'grpquota' mount options are allowed even without quota feature
1933 * to support legacy quotas in quota files.
1934 */
1935 if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
1936 ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
1937 "Cannot enable project quota enforcement.");
1938 return 0;
1939 }
1940 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1941 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1942 clear_opt(sb, USRQUOTA);
1943
1944 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1945 clear_opt(sb, GRPQUOTA);
1946
1947 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1948 ext4_msg(sb, KERN_ERR, "old and new quota "
1949 "format mixing");
1950 return 0;
1951 }
1952
1953 if (!sbi->s_jquota_fmt) {
1954 ext4_msg(sb, KERN_ERR, "journaled quota format "
1955 "not specified");
1956 return 0;
1957 }
1958 }
1959#endif
1960 if (test_opt(sb, DIOREAD_NOLOCK)) {
1961 int blocksize =
1962 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1963
1964 if (blocksize < PAGE_SIZE) {
1965 ext4_msg(sb, KERN_ERR, "can't mount with "
1966 "dioread_nolock if block size != PAGE_SIZE");
1967 return 0;
1968 }
1969 }
1970 return 1;
1971}
1972
1973static inline void ext4_show_quota_options(struct seq_file *seq,
1974 struct super_block *sb)
1975{
1976#if defined(CONFIG_QUOTA)
1977 struct ext4_sb_info *sbi = EXT4_SB(sb);
1978
1979 if (sbi->s_jquota_fmt) {
1980 char *fmtname = "";
1981
1982 switch (sbi->s_jquota_fmt) {
1983 case QFMT_VFS_OLD:
1984 fmtname = "vfsold";
1985 break;
1986 case QFMT_VFS_V0:
1987 fmtname = "vfsv0";
1988 break;
1989 case QFMT_VFS_V1:
1990 fmtname = "vfsv1";
1991 break;
1992 }
1993 seq_printf(seq, ",jqfmt=%s", fmtname);
1994 }
1995
1996 if (sbi->s_qf_names[USRQUOTA])
1997 seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
1998
1999 if (sbi->s_qf_names[GRPQUOTA])
2000 seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
2001#endif
2002}
2003
2004static const char *token2str(int token)
2005{
2006 const struct match_token *t;
2007
2008 for (t = tokens; t->token != Opt_err; t++)
2009 if (t->token == token && !strchr(t->pattern, '='))
2010 break;
2011 return t->pattern;
2012}
2013
2014/*
2015 * Show an option if
2016 * - it's set to a non-default value OR
2017 * - if the per-sb default is different from the global default
2018 */
2019static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
2020 int nodefs)
2021{
2022 struct ext4_sb_info *sbi = EXT4_SB(sb);
2023 struct ext4_super_block *es = sbi->s_es;
2024 int def_errors, def_mount_opt = sbi->s_def_mount_opt;
2025 const struct mount_opts *m;
2026 char sep = nodefs ? '\n' : ',';
2027
2028#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2029#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2030
2031 if (sbi->s_sb_block != 1)
2032 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
2033
2034 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
2035 int want_set = m->flags & MOPT_SET;
2036 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
2037 (m->flags & MOPT_CLEAR_ERR))
2038 continue;
2039 if (!nodefs && !(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
2040 continue; /* skip if same as the default */
2041 if ((want_set &&
2042 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
2043 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
2044 continue; /* select Opt_noFoo vs Opt_Foo */
2045 SEQ_OPTS_PRINT("%s", token2str(m->token));
2046 }
2047
2048 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
2049 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
2050 SEQ_OPTS_PRINT("resuid=%u",
2051 from_kuid_munged(&init_user_ns, sbi->s_resuid));
2052 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
2053 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
2054 SEQ_OPTS_PRINT("resgid=%u",
2055 from_kgid_munged(&init_user_ns, sbi->s_resgid));
2056 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
2057 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
2058 SEQ_OPTS_PUTS("errors=remount-ro");
2059 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
2060 SEQ_OPTS_PUTS("errors=continue");
2061 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
2062 SEQ_OPTS_PUTS("errors=panic");
2063 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
2064 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
2065 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
2066 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
2067 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
2068 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2069 if (sb->s_flags & SB_I_VERSION)
2070 SEQ_OPTS_PUTS("i_version");
2071 if (nodefs || sbi->s_stripe)
2072 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
2073 if (nodefs || EXT4_MOUNT_DATA_FLAGS &
2074 (sbi->s_mount_opt ^ def_mount_opt)) {
2075 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2076 SEQ_OPTS_PUTS("data=journal");
2077 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2078 SEQ_OPTS_PUTS("data=ordered");
2079 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
2080 SEQ_OPTS_PUTS("data=writeback");
2081 }
2082 if (nodefs ||
2083 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
2084 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2085 sbi->s_inode_readahead_blks);
2086
2087 if (test_opt(sb, INIT_INODE_TABLE) && (nodefs ||
2088 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
2089 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
2090 if (nodefs || sbi->s_max_dir_size_kb)
2091 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2092 if (test_opt(sb, DATA_ERR_ABORT))
2093 SEQ_OPTS_PUTS("data_err=abort");
2094
2095 ext4_show_quota_options(seq, sb);
2096 return 0;
2097}
2098
2099static int ext4_show_options(struct seq_file *seq, struct dentry *root)
2100{
2101 return _ext4_show_options(seq, root->d_sb, 0);
2102}
2103
2104int ext4_seq_options_show(struct seq_file *seq, void *offset)
2105{
2106 struct super_block *sb = seq->private;
2107 int rc;
2108
2109 seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");
2110 rc = _ext4_show_options(seq, sb, 1);
2111 seq_puts(seq, "\n");
2112 return rc;
2113}
2114
2115static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
2116 int read_only)
2117{
2118 struct ext4_sb_info *sbi = EXT4_SB(sb);
2119 int res = 0;
2120
2121 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
2122 ext4_msg(sb, KERN_ERR, "revision level too high, "
2123 "forcing read-only mode");
2124 res = SB_RDONLY;
2125 }
2126 if (read_only)
2127 goto done;
2128 if (!(sbi->s_mount_state & EXT4_VALID_FS))
2129 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
2130 "running e2fsck is recommended");
2131 else if (sbi->s_mount_state & EXT4_ERROR_FS)
2132 ext4_msg(sb, KERN_WARNING,
2133 "warning: mounting fs with errors, "
2134 "running e2fsck is recommended");
2135 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
2136 le16_to_cpu(es->s_mnt_count) >=
2137 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
2138 ext4_msg(sb, KERN_WARNING,
2139 "warning: maximal mount count reached, "
2140 "running e2fsck is recommended");
2141 else if (le32_to_cpu(es->s_checkinterval) &&
2142 (le32_to_cpu(es->s_lastcheck) +
2143 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
2144 ext4_msg(sb, KERN_WARNING,
2145 "warning: checktime reached, "
2146 "running e2fsck is recommended");
2147 if (!sbi->s_journal)
2148 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
2149 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
2150 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
2151 le16_add_cpu(&es->s_mnt_count, 1);
2152 es->s_mtime = cpu_to_le32(get_seconds());
2153 ext4_update_dynamic_rev(sb);
2154 if (sbi->s_journal)
2155 ext4_set_feature_journal_needs_recovery(sb);
2156
2157 ext4_commit_super(sb, 1);
2158done:
2159 if (test_opt(sb, DEBUG))
2160 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
2161 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
2162 sb->s_blocksize,
2163 sbi->s_groups_count,
2164 EXT4_BLOCKS_PER_GROUP(sb),
2165 EXT4_INODES_PER_GROUP(sb),
2166 sbi->s_mount_opt, sbi->s_mount_opt2);
2167
2168 cleancache_init_fs(sb);
2169 return res;
2170}
2171
2172int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
2173{
2174 struct ext4_sb_info *sbi = EXT4_SB(sb);
2175 struct flex_groups *new_groups;
2176 int size;
2177
2178 if (!sbi->s_log_groups_per_flex)
2179 return 0;
2180
2181 size = ext4_flex_group(sbi, ngroup - 1) + 1;
2182 if (size <= sbi->s_flex_groups_allocated)
2183 return 0;
2184
2185 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
2186 new_groups = kvzalloc(size, GFP_KERNEL);
2187 if (!new_groups) {
2188 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
2189 size / (int) sizeof(struct flex_groups));
2190 return -ENOMEM;
2191 }
2192
2193 if (sbi->s_flex_groups) {
2194 memcpy(new_groups, sbi->s_flex_groups,
2195 (sbi->s_flex_groups_allocated *
2196 sizeof(struct flex_groups)));
2197 kvfree(sbi->s_flex_groups);
2198 }
2199 sbi->s_flex_groups = new_groups;
2200 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
2201 return 0;
2202}
2203
2204static int ext4_fill_flex_info(struct super_block *sb)
2205{
2206 struct ext4_sb_info *sbi = EXT4_SB(sb);
2207 struct ext4_group_desc *gdp = NULL;
2208 ext4_group_t flex_group;
2209 int i, err;
2210
2211 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
2212 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
2213 sbi->s_log_groups_per_flex = 0;
2214 return 1;
2215 }
2216
2217 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2218 if (err)
2219 goto failed;
2220
2221 for (i = 0; i < sbi->s_groups_count; i++) {
2222 gdp = ext4_get_group_desc(sb, i, NULL);
2223
2224 flex_group = ext4_flex_group(sbi, i);
2225 atomic_add(ext4_free_inodes_count(sb, gdp),
2226 &sbi->s_flex_groups[flex_group].free_inodes);
2227 atomic64_add(ext4_free_group_clusters(sb, gdp),
2228 &sbi->s_flex_groups[flex_group].free_clusters);
2229 atomic_add(ext4_used_dirs_count(sb, gdp),
2230 &sbi->s_flex_groups[flex_group].used_dirs);
2231 }
2232
2233 return 1;
2234failed:
2235 return 0;
2236}
2237
2238static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
2239 struct ext4_group_desc *gdp)
2240{
2241 int offset = offsetof(struct ext4_group_desc, bg_checksum);
2242 __u16 crc = 0;
2243 __le32 le_group = cpu_to_le32(block_group);
2244 struct ext4_sb_info *sbi = EXT4_SB(sb);
2245
2246 if (ext4_has_metadata_csum(sbi->s_sb)) {
2247 /* Use new metadata_csum algorithm */
2248 __u32 csum32;
2249 __u16 dummy_csum = 0;
2250
2251 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2252 sizeof(le_group));
2253 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
2254 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
2255 sizeof(dummy_csum));
2256 offset += sizeof(dummy_csum);
2257 if (offset < sbi->s_desc_size)
2258 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
2259 sbi->s_desc_size - offset);
2260
2261 crc = csum32 & 0xFFFF;
2262 goto out;
2263 }
2264
2265 /* old crc16 code */
2266 if (!ext4_has_feature_gdt_csum(sb))
2267 return 0;
2268
2269 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2270 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2271 crc = crc16(crc, (__u8 *)gdp, offset);
2272 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2273 /* for checksum of struct ext4_group_desc do the rest...*/
2274 if (ext4_has_feature_64bit(sb) &&
2275 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2276 crc = crc16(crc, (__u8 *)gdp + offset,
2277 le16_to_cpu(sbi->s_es->s_desc_size) -
2278 offset);
2279
2280out:
2281 return cpu_to_le16(crc);
2282}
2283
2284int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
2285 struct ext4_group_desc *gdp)
2286{
2287 if (ext4_has_group_desc_csum(sb) &&
2288 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
2289 return 0;
2290
2291 return 1;
2292}
2293
2294void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2295 struct ext4_group_desc *gdp)
2296{
2297 if (!ext4_has_group_desc_csum(sb))
2298 return;
2299 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
2300}
2301
2302/* Called at mount-time, super-block is locked */
2303static int ext4_check_descriptors(struct super_block *sb,
2304 ext4_fsblk_t sb_block,
2305 ext4_group_t *first_not_zeroed)
2306{
2307 struct ext4_sb_info *sbi = EXT4_SB(sb);
2308 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2309 ext4_fsblk_t last_block;
2310 ext4_fsblk_t block_bitmap;
2311 ext4_fsblk_t inode_bitmap;
2312 ext4_fsblk_t inode_table;
2313 int flexbg_flag = 0;
2314 ext4_group_t i, grp = sbi->s_groups_count;
2315
2316 if (ext4_has_feature_flex_bg(sb))
2317 flexbg_flag = 1;
2318
2319 ext4_debug("Checking group descriptors");
2320
2321 for (i = 0; i < sbi->s_groups_count; i++) {
2322 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2323
2324 if (i == sbi->s_groups_count - 1 || flexbg_flag)
2325 last_block = ext4_blocks_count(sbi->s_es) - 1;
2326 else
2327 last_block = first_block +
2328 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2329
2330 if ((grp == sbi->s_groups_count) &&
2331 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2332 grp = i;
2333
2334 block_bitmap = ext4_block_bitmap(sb, gdp);
2335 if (block_bitmap == sb_block) {
2336 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2337 "Block bitmap for group %u overlaps "
2338 "superblock", i);
2339 if (!sb_rdonly(sb))
2340 return 0;
2341 }
2342 if (block_bitmap < first_block || block_bitmap > last_block) {
2343 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2344 "Block bitmap for group %u not in group "
2345 "(block %llu)!", i, block_bitmap);
2346 return 0;
2347 }
2348 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2349 if (inode_bitmap == sb_block) {
2350 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2351 "Inode bitmap for group %u overlaps "
2352 "superblock", i);
2353 if (!sb_rdonly(sb))
2354 return 0;
2355 }
2356 if (inode_bitmap < first_block || inode_bitmap > last_block) {
2357 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2358 "Inode bitmap for group %u not in group "
2359 "(block %llu)!", i, inode_bitmap);
2360 return 0;
2361 }
2362 inode_table = ext4_inode_table(sb, gdp);
2363 if (inode_table == sb_block) {
2364 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2365 "Inode table for group %u overlaps "
2366 "superblock", i);
2367 if (!sb_rdonly(sb))
2368 return 0;
2369 }
2370 if (inode_table < first_block ||
2371 inode_table + sbi->s_itb_per_group - 1 > last_block) {
2372 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2373 "Inode table for group %u not in group "
2374 "(block %llu)!", i, inode_table);
2375 return 0;
2376 }
2377 ext4_lock_group(sb, i);
2378 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2379 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2380 "Checksum for group %u failed (%u!=%u)",
2381 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
2382 gdp)), le16_to_cpu(gdp->bg_checksum));
2383 if (!sb_rdonly(sb)) {
2384 ext4_unlock_group(sb, i);
2385 return 0;
2386 }
2387 }
2388 ext4_unlock_group(sb, i);
2389 if (!flexbg_flag)
2390 first_block += EXT4_BLOCKS_PER_GROUP(sb);
2391 }
2392 if (NULL != first_not_zeroed)
2393 *first_not_zeroed = grp;
2394 return 1;
2395}
2396
2397/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2398 * the superblock) which were deleted from all directories, but held open by
2399 * a process at the time of a crash. We walk the list and try to delete these
2400 * inodes at recovery time (only with a read-write filesystem).
2401 *
2402 * In order to keep the orphan inode chain consistent during traversal (in
2403 * case of crash during recovery), we link each inode into the superblock
2404 * orphan list_head and handle it the same way as an inode deletion during
2405 * normal operation (which journals the operations for us).
2406 *
2407 * We only do an iget() and an iput() on each inode, which is very safe if we
2408 * accidentally point at an in-use or already deleted inode. The worst that
2409 * can happen in this case is that we get a "bit already cleared" message from
2410 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2411 * e2fsck was run on this filesystem, and it must have already done the orphan
2412 * inode cleanup for us, so we can safely abort without any further action.
2413 */
2414static void ext4_orphan_cleanup(struct super_block *sb,
2415 struct ext4_super_block *es)
2416{
2417 unsigned int s_flags = sb->s_flags;
2418 int ret, nr_orphans = 0, nr_truncates = 0;
2419#ifdef CONFIG_QUOTA
2420 int quota_update = 0;
2421 int i;
2422#endif
2423 if (!es->s_last_orphan) {
2424 jbd_debug(4, "no orphan inodes to clean up\n");
2425 return;
2426 }
2427
2428 if (bdev_read_only(sb->s_bdev)) {
2429 ext4_msg(sb, KERN_ERR, "write access "
2430 "unavailable, skipping orphan cleanup");
2431 return;
2432 }
2433
2434 /* Check if feature set would not allow a r/w mount */
2435 if (!ext4_feature_set_ok(sb, 0)) {
2436 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2437 "unknown ROCOMPAT features");
2438 return;
2439 }
2440
2441 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2442 /* don't clear list on RO mount w/ errors */
2443 if (es->s_last_orphan && !(s_flags & SB_RDONLY)) {
2444 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
2445 "clearing orphan list.\n");
2446 es->s_last_orphan = 0;
2447 }
2448 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2449 return;
2450 }
2451
2452 if (s_flags & SB_RDONLY) {
2453 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2454 sb->s_flags &= ~SB_RDONLY;
2455 }
2456#ifdef CONFIG_QUOTA
2457 /* Needed for iput() to work correctly and not trash data */
2458 sb->s_flags |= SB_ACTIVE;
2459
2460 /*
2461 * Turn on quotas which were not enabled for read-only mounts if
2462 * filesystem has quota feature, so that they are updated correctly.
2463 */
2464 if (ext4_has_feature_quota(sb) && (s_flags & SB_RDONLY)) {
2465 int ret = ext4_enable_quotas(sb);
2466
2467 if (!ret)
2468 quota_update = 1;
2469 else
2470 ext4_msg(sb, KERN_ERR,
2471 "Cannot turn on quotas: error %d", ret);
2472 }
2473
2474 /* Turn on journaled quotas used for old sytle */
2475 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2476 if (EXT4_SB(sb)->s_qf_names[i]) {
2477 int ret = ext4_quota_on_mount(sb, i);
2478
2479 if (!ret)
2480 quota_update = 1;
2481 else
2482 ext4_msg(sb, KERN_ERR,
2483 "Cannot turn on journaled "
2484 "quota: type %d: error %d", i, ret);
2485 }
2486 }
2487#endif
2488
2489 while (es->s_last_orphan) {
2490 struct inode *inode;
2491
2492 /*
2493 * We may have encountered an error during cleanup; if
2494 * so, skip the rest.
2495 */
2496 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2497 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2498 es->s_last_orphan = 0;
2499 break;
2500 }
2501
2502 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2503 if (IS_ERR(inode)) {
2504 es->s_last_orphan = 0;
2505 break;
2506 }
2507
2508 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2509 dquot_initialize(inode);
2510 if (inode->i_nlink) {
2511 if (test_opt(sb, DEBUG))
2512 ext4_msg(sb, KERN_DEBUG,
2513 "%s: truncating inode %lu to %lld bytes",
2514 __func__, inode->i_ino, inode->i_size);
2515 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2516 inode->i_ino, inode->i_size);
2517 inode_lock(inode);
2518 truncate_inode_pages(inode->i_mapping, inode->i_size);
2519 ret = ext4_truncate(inode);
2520 if (ret)
2521 ext4_std_error(inode->i_sb, ret);
2522 inode_unlock(inode);
2523 nr_truncates++;
2524 } else {
2525 if (test_opt(sb, DEBUG))
2526 ext4_msg(sb, KERN_DEBUG,
2527 "%s: deleting unreferenced inode %lu",
2528 __func__, inode->i_ino);
2529 jbd_debug(2, "deleting unreferenced inode %lu\n",
2530 inode->i_ino);
2531 nr_orphans++;
2532 }
2533 iput(inode); /* The delete magic happens here! */
2534 }
2535
2536#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2537
2538 if (nr_orphans)
2539 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2540 PLURAL(nr_orphans));
2541 if (nr_truncates)
2542 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2543 PLURAL(nr_truncates));
2544#ifdef CONFIG_QUOTA
2545 /* Turn off quotas if they were enabled for orphan cleanup */
2546 if (quota_update) {
2547 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2548 if (sb_dqopt(sb)->files[i])
2549 dquot_quota_off(sb, i);
2550 }
2551 }
2552#endif
2553 sb->s_flags = s_flags; /* Restore SB_RDONLY status */
2554}
2555
2556/*
2557 * Maximal extent format file size.
2558 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2559 * extent format containers, within a sector_t, and within i_blocks
2560 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2561 * so that won't be a limiting factor.
2562 *
2563 * However there is other limiting factor. We do store extents in the form
2564 * of starting block and length, hence the resulting length of the extent
2565 * covering maximum file size must fit into on-disk format containers as
2566 * well. Given that length is always by 1 unit bigger than max unit (because
2567 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2568 *
2569 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2570 */
2571static loff_t ext4_max_size(int blkbits, int has_huge_files)
2572{
2573 loff_t res;
2574 loff_t upper_limit = MAX_LFS_FILESIZE;
2575
2576 /* small i_blocks in vfs inode? */
2577 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2578 /*
2579 * CONFIG_LBDAF is not enabled implies the inode
2580 * i_block represent total blocks in 512 bytes
2581 * 32 == size of vfs inode i_blocks * 8
2582 */
2583 upper_limit = (1LL << 32) - 1;
2584
2585 /* total blocks in file system block size */
2586 upper_limit >>= (blkbits - 9);
2587 upper_limit <<= blkbits;
2588 }
2589
2590 /*
2591 * 32-bit extent-start container, ee_block. We lower the maxbytes
2592 * by one fs block, so ee_len can cover the extent of maximum file
2593 * size
2594 */
2595 res = (1LL << 32) - 1;
2596 res <<= blkbits;
2597
2598 /* Sanity check against vm- & vfs- imposed limits */
2599 if (res > upper_limit)
2600 res = upper_limit;
2601
2602 return res;
2603}
2604
2605/*
2606 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2607 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2608 * We need to be 1 filesystem block less than the 2^48 sector limit.
2609 */
2610static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2611{
2612 loff_t res = EXT4_NDIR_BLOCKS;
2613 int meta_blocks;
2614 loff_t upper_limit;
2615 /* This is calculated to be the largest file size for a dense, block
2616 * mapped file such that the file's total number of 512-byte sectors,
2617 * including data and all indirect blocks, does not exceed (2^48 - 1).
2618 *
2619 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2620 * number of 512-byte sectors of the file.
2621 */
2622
2623 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2624 /*
2625 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2626 * the inode i_block field represents total file blocks in
2627 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2628 */
2629 upper_limit = (1LL << 32) - 1;
2630
2631 /* total blocks in file system block size */
2632 upper_limit >>= (bits - 9);
2633
2634 } else {
2635 /*
2636 * We use 48 bit ext4_inode i_blocks
2637 * With EXT4_HUGE_FILE_FL set the i_blocks
2638 * represent total number of blocks in
2639 * file system block size
2640 */
2641 upper_limit = (1LL << 48) - 1;
2642
2643 }
2644
2645 /* indirect blocks */
2646 meta_blocks = 1;
2647 /* double indirect blocks */
2648 meta_blocks += 1 + (1LL << (bits-2));
2649 /* tripple indirect blocks */
2650 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2651
2652 upper_limit -= meta_blocks;
2653 upper_limit <<= bits;
2654
2655 res += 1LL << (bits-2);
2656 res += 1LL << (2*(bits-2));
2657 res += 1LL << (3*(bits-2));
2658 res <<= bits;
2659 if (res > upper_limit)
2660 res = upper_limit;
2661
2662 if (res > MAX_LFS_FILESIZE)
2663 res = MAX_LFS_FILESIZE;
2664
2665 return res;
2666}
2667
2668static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2669 ext4_fsblk_t logical_sb_block, int nr)
2670{
2671 struct ext4_sb_info *sbi = EXT4_SB(sb);
2672 ext4_group_t bg, first_meta_bg;
2673 int has_super = 0;
2674
2675 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2676
2677 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
2678 return logical_sb_block + nr + 1;
2679 bg = sbi->s_desc_per_block * nr;
2680 if (ext4_bg_has_super(sb, bg))
2681 has_super = 1;
2682
2683 /*
2684 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2685 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2686 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2687 * compensate.
2688 */
2689 if (sb->s_blocksize == 1024 && nr == 0 &&
2690 le32_to_cpu(sbi->s_es->s_first_data_block) == 0)
2691 has_super++;
2692
2693 return (has_super + ext4_group_first_block_no(sb, bg));
2694}
2695
2696/**
2697 * ext4_get_stripe_size: Get the stripe size.
2698 * @sbi: In memory super block info
2699 *
2700 * If we have specified it via mount option, then
2701 * use the mount option value. If the value specified at mount time is
2702 * greater than the blocks per group use the super block value.
2703 * If the super block value is greater than blocks per group return 0.
2704 * Allocator needs it be less than blocks per group.
2705 *
2706 */
2707static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2708{
2709 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2710 unsigned long stripe_width =
2711 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2712 int ret;
2713
2714 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2715 ret = sbi->s_stripe;
2716 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
2717 ret = stripe_width;
2718 else if (stride && stride <= sbi->s_blocks_per_group)
2719 ret = stride;
2720 else
2721 ret = 0;
2722
2723 /*
2724 * If the stripe width is 1, this makes no sense and
2725 * we set it to 0 to turn off stripe handling code.
2726 */
2727 if (ret <= 1)
2728 ret = 0;
2729
2730 return ret;
2731}
2732
2733/*
2734 * Check whether this filesystem can be mounted based on
2735 * the features present and the RDONLY/RDWR mount requested.
2736 * Returns 1 if this filesystem can be mounted as requested,
2737 * 0 if it cannot be.
2738 */
2739static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2740{
2741 if (ext4_has_unknown_ext4_incompat_features(sb)) {
2742 ext4_msg(sb, KERN_ERR,
2743 "Couldn't mount because of "
2744 "unsupported optional features (%x)",
2745 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2746 ~EXT4_FEATURE_INCOMPAT_SUPP));
2747 return 0;
2748 }
2749
2750 if (readonly)
2751 return 1;
2752
2753 if (ext4_has_feature_readonly(sb)) {
2754 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
2755 sb->s_flags |= SB_RDONLY;
2756 return 1;
2757 }
2758
2759 /* Check that feature set is OK for a read-write mount */
2760 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
2761 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2762 "unsupported optional features (%x)",
2763 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2764 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2765 return 0;
2766 }
2767 /*
2768 * Large file size enabled file system can only be mounted
2769 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2770 */
2771 if (ext4_has_feature_huge_file(sb)) {
2772 if (sizeof(blkcnt_t) < sizeof(u64)) {
2773 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2774 "cannot be mounted RDWR without "
2775 "CONFIG_LBDAF");
2776 return 0;
2777 }
2778 }
2779 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
2780 ext4_msg(sb, KERN_ERR,
2781 "Can't support bigalloc feature without "
2782 "extents feature\n");
2783 return 0;
2784 }
2785
2786#ifndef CONFIG_QUOTA
2787 if (ext4_has_feature_quota(sb) && !readonly) {
2788 ext4_msg(sb, KERN_ERR,
2789 "Filesystem with quota feature cannot be mounted RDWR "
2790 "without CONFIG_QUOTA");
2791 return 0;
2792 }
2793 if (ext4_has_feature_project(sb) && !readonly) {
2794 ext4_msg(sb, KERN_ERR,
2795 "Filesystem with project quota feature cannot be mounted RDWR "
2796 "without CONFIG_QUOTA");
2797 return 0;
2798 }
2799#endif /* CONFIG_QUOTA */
2800 return 1;
2801}
2802
2803/*
2804 * This function is called once a day if we have errors logged
2805 * on the file system
2806 */
2807static void print_daily_error_info(struct timer_list *t)
2808{
2809 struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);
2810 struct super_block *sb = sbi->s_sb;
2811 struct ext4_super_block *es = sbi->s_es;
2812
2813 if (es->s_error_count)
2814 /* fsck newer than v1.41.13 is needed to clean this condition. */
2815 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
2816 le32_to_cpu(es->s_error_count));
2817 if (es->s_first_error_time) {
2818 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
2819 sb->s_id, le32_to_cpu(es->s_first_error_time),
2820 (int) sizeof(es->s_first_error_func),
2821 es->s_first_error_func,
2822 le32_to_cpu(es->s_first_error_line));
2823 if (es->s_first_error_ino)
2824 printk(KERN_CONT ": inode %u",
2825 le32_to_cpu(es->s_first_error_ino));
2826 if (es->s_first_error_block)
2827 printk(KERN_CONT ": block %llu", (unsigned long long)
2828 le64_to_cpu(es->s_first_error_block));
2829 printk(KERN_CONT "\n");
2830 }
2831 if (es->s_last_error_time) {
2832 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
2833 sb->s_id, le32_to_cpu(es->s_last_error_time),
2834 (int) sizeof(es->s_last_error_func),
2835 es->s_last_error_func,
2836 le32_to_cpu(es->s_last_error_line));
2837 if (es->s_last_error_ino)
2838 printk(KERN_CONT ": inode %u",
2839 le32_to_cpu(es->s_last_error_ino));
2840 if (es->s_last_error_block)
2841 printk(KERN_CONT ": block %llu", (unsigned long long)
2842 le64_to_cpu(es->s_last_error_block));
2843 printk(KERN_CONT "\n");
2844 }
2845 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2846}
2847
2848/* Find next suitable group and run ext4_init_inode_table */
2849static int ext4_run_li_request(struct ext4_li_request *elr)
2850{
2851 struct ext4_group_desc *gdp = NULL;
2852 ext4_group_t group, ngroups;
2853 struct super_block *sb;
2854 unsigned long timeout = 0;
2855 int ret = 0;
2856
2857 sb = elr->lr_super;
2858 ngroups = EXT4_SB(sb)->s_groups_count;
2859
2860 for (group = elr->lr_next_group; group < ngroups; group++) {
2861 gdp = ext4_get_group_desc(sb, group, NULL);
2862 if (!gdp) {
2863 ret = 1;
2864 break;
2865 }
2866
2867 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2868 break;
2869 }
2870
2871 if (group >= ngroups)
2872 ret = 1;
2873
2874 if (!ret) {
2875 timeout = jiffies;
2876 ret = ext4_init_inode_table(sb, group,
2877 elr->lr_timeout ? 0 : 1);
2878 if (elr->lr_timeout == 0) {
2879 timeout = (jiffies - timeout) *
2880 elr->lr_sbi->s_li_wait_mult;
2881 elr->lr_timeout = timeout;
2882 }
2883 elr->lr_next_sched = jiffies + elr->lr_timeout;
2884 elr->lr_next_group = group + 1;
2885 }
2886 return ret;
2887}
2888
2889/*
2890 * Remove lr_request from the list_request and free the
2891 * request structure. Should be called with li_list_mtx held
2892 */
2893static void ext4_remove_li_request(struct ext4_li_request *elr)
2894{
2895 struct ext4_sb_info *sbi;
2896
2897 if (!elr)
2898 return;
2899
2900 sbi = elr->lr_sbi;
2901
2902 list_del(&elr->lr_request);
2903 sbi->s_li_request = NULL;
2904 kfree(elr);
2905}
2906
2907static void ext4_unregister_li_request(struct super_block *sb)
2908{
2909 mutex_lock(&ext4_li_mtx);
2910 if (!ext4_li_info) {
2911 mutex_unlock(&ext4_li_mtx);
2912 return;
2913 }
2914
2915 mutex_lock(&ext4_li_info->li_list_mtx);
2916 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2917 mutex_unlock(&ext4_li_info->li_list_mtx);
2918 mutex_unlock(&ext4_li_mtx);
2919}
2920
2921static struct task_struct *ext4_lazyinit_task;
2922
2923/*
2924 * This is the function where ext4lazyinit thread lives. It walks
2925 * through the request list searching for next scheduled filesystem.
2926 * When such a fs is found, run the lazy initialization request
2927 * (ext4_rn_li_request) and keep track of the time spend in this
2928 * function. Based on that time we compute next schedule time of
2929 * the request. When walking through the list is complete, compute
2930 * next waking time and put itself into sleep.
2931 */
2932static int ext4_lazyinit_thread(void *arg)
2933{
2934 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2935 struct list_head *pos, *n;
2936 struct ext4_li_request *elr;
2937 unsigned long next_wakeup, cur;
2938
2939 BUG_ON(NULL == eli);
2940
2941cont_thread:
2942 while (true) {
2943 next_wakeup = MAX_JIFFY_OFFSET;
2944
2945 mutex_lock(&eli->li_list_mtx);
2946 if (list_empty(&eli->li_request_list)) {
2947 mutex_unlock(&eli->li_list_mtx);
2948 goto exit_thread;
2949 }
2950 list_for_each_safe(pos, n, &eli->li_request_list) {
2951 int err = 0;
2952 int progress = 0;
2953 elr = list_entry(pos, struct ext4_li_request,
2954 lr_request);
2955
2956 if (time_before(jiffies, elr->lr_next_sched)) {
2957 if (time_before(elr->lr_next_sched, next_wakeup))
2958 next_wakeup = elr->lr_next_sched;
2959 continue;
2960 }
2961 if (down_read_trylock(&elr->lr_super->s_umount)) {
2962 if (sb_start_write_trylock(elr->lr_super)) {
2963 progress = 1;
2964 /*
2965 * We hold sb->s_umount, sb can not
2966 * be removed from the list, it is
2967 * now safe to drop li_list_mtx
2968 */
2969 mutex_unlock(&eli->li_list_mtx);
2970 err = ext4_run_li_request(elr);
2971 sb_end_write(elr->lr_super);
2972 mutex_lock(&eli->li_list_mtx);
2973 n = pos->next;
2974 }
2975 up_read((&elr->lr_super->s_umount));
2976 }
2977 /* error, remove the lazy_init job */
2978 if (err) {
2979 ext4_remove_li_request(elr);
2980 continue;
2981 }
2982 if (!progress) {
2983 elr->lr_next_sched = jiffies +
2984 (prandom_u32()
2985 % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
2986 }
2987 if (time_before(elr->lr_next_sched, next_wakeup))
2988 next_wakeup = elr->lr_next_sched;
2989 }
2990 mutex_unlock(&eli->li_list_mtx);
2991
2992 try_to_freeze();
2993
2994 cur = jiffies;
2995 if ((time_after_eq(cur, next_wakeup)) ||
2996 (MAX_JIFFY_OFFSET == next_wakeup)) {
2997 cond_resched();
2998 continue;
2999 }
3000
3001 schedule_timeout_interruptible(next_wakeup - cur);
3002
3003 if (kthread_should_stop()) {
3004 ext4_clear_request_list();
3005 goto exit_thread;
3006 }
3007 }
3008
3009exit_thread:
3010 /*
3011 * It looks like the request list is empty, but we need
3012 * to check it under the li_list_mtx lock, to prevent any
3013 * additions into it, and of course we should lock ext4_li_mtx
3014 * to atomically free the list and ext4_li_info, because at
3015 * this point another ext4 filesystem could be registering
3016 * new one.
3017 */
3018 mutex_lock(&ext4_li_mtx);
3019 mutex_lock(&eli->li_list_mtx);
3020 if (!list_empty(&eli->li_request_list)) {
3021 mutex_unlock(&eli->li_list_mtx);
3022 mutex_unlock(&ext4_li_mtx);
3023 goto cont_thread;
3024 }
3025 mutex_unlock(&eli->li_list_mtx);
3026 kfree(ext4_li_info);
3027 ext4_li_info = NULL;
3028 mutex_unlock(&ext4_li_mtx);
3029
3030 return 0;
3031}
3032
3033static void ext4_clear_request_list(void)
3034{
3035 struct list_head *pos, *n;
3036 struct ext4_li_request *elr;
3037
3038 mutex_lock(&ext4_li_info->li_list_mtx);
3039 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3040 elr = list_entry(pos, struct ext4_li_request,
3041 lr_request);
3042 ext4_remove_li_request(elr);
3043 }
3044 mutex_unlock(&ext4_li_info->li_list_mtx);
3045}
3046
3047static int ext4_run_lazyinit_thread(void)
3048{
3049 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3050 ext4_li_info, "ext4lazyinit");
3051 if (IS_ERR(ext4_lazyinit_task)) {
3052 int err = PTR_ERR(ext4_lazyinit_task);
3053 ext4_clear_request_list();
3054 kfree(ext4_li_info);
3055 ext4_li_info = NULL;
3056 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
3057 "initialization thread\n",
3058 err);
3059 return err;
3060 }
3061 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
3062 return 0;
3063}
3064
3065/*
3066 * Check whether it make sense to run itable init. thread or not.
3067 * If there is at least one uninitialized inode table, return
3068 * corresponding group number, else the loop goes through all
3069 * groups and return total number of groups.
3070 */
3071static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3072{
3073 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3074 struct ext4_group_desc *gdp = NULL;
3075
3076 for (group = 0; group < ngroups; group++) {
3077 gdp = ext4_get_group_desc(sb, group, NULL);
3078 if (!gdp)
3079 continue;
3080
3081 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3082 break;
3083 }
3084
3085 return group;
3086}
3087
3088static int ext4_li_info_new(void)
3089{
3090 struct ext4_lazy_init *eli = NULL;
3091
3092 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3093 if (!eli)
3094 return -ENOMEM;
3095
3096 INIT_LIST_HEAD(&eli->li_request_list);
3097 mutex_init(&eli->li_list_mtx);
3098
3099 eli->li_state |= EXT4_LAZYINIT_QUIT;
3100
3101 ext4_li_info = eli;
3102
3103 return 0;
3104}
3105
3106static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3107 ext4_group_t start)
3108{
3109 struct ext4_sb_info *sbi = EXT4_SB(sb);
3110 struct ext4_li_request *elr;
3111
3112 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3113 if (!elr)
3114 return NULL;
3115
3116 elr->lr_super = sb;
3117 elr->lr_sbi = sbi;
3118 elr->lr_next_group = start;
3119
3120 /*
3121 * Randomize first schedule time of the request to
3122 * spread the inode table initialization requests
3123 * better.
3124 */
3125 elr->lr_next_sched = jiffies + (prandom_u32() %
3126 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
3127 return elr;
3128}
3129
3130int ext4_register_li_request(struct super_block *sb,
3131 ext4_group_t first_not_zeroed)
3132{
3133 struct ext4_sb_info *sbi = EXT4_SB(sb);
3134 struct ext4_li_request *elr = NULL;
3135 ext4_group_t ngroups = sbi->s_groups_count;
3136 int ret = 0;
3137
3138 mutex_lock(&ext4_li_mtx);
3139 if (sbi->s_li_request != NULL) {
3140 /*
3141 * Reset timeout so it can be computed again, because
3142 * s_li_wait_mult might have changed.
3143 */
3144 sbi->s_li_request->lr_timeout = 0;
3145 goto out;
3146 }
3147
3148 if (first_not_zeroed == ngroups || sb_rdonly(sb) ||
3149 !test_opt(sb, INIT_INODE_TABLE))
3150 goto out;
3151
3152 elr = ext4_li_request_new(sb, first_not_zeroed);
3153 if (!elr) {
3154 ret = -ENOMEM;
3155 goto out;
3156 }
3157
3158 if (NULL == ext4_li_info) {
3159 ret = ext4_li_info_new();
3160 if (ret)
3161 goto out;
3162 }
3163
3164 mutex_lock(&ext4_li_info->li_list_mtx);
3165 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3166 mutex_unlock(&ext4_li_info->li_list_mtx);
3167
3168 sbi->s_li_request = elr;
3169 /*
3170 * set elr to NULL here since it has been inserted to
3171 * the request_list and the removal and free of it is
3172 * handled by ext4_clear_request_list from now on.
3173 */
3174 elr = NULL;
3175
3176 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3177 ret = ext4_run_lazyinit_thread();
3178 if (ret)
3179 goto out;
3180 }
3181out:
3182 mutex_unlock(&ext4_li_mtx);
3183 if (ret)
3184 kfree(elr);
3185 return ret;
3186}
3187
3188/*
3189 * We do not need to lock anything since this is called on
3190 * module unload.
3191 */
3192static void ext4_destroy_lazyinit_thread(void)
3193{
3194 /*
3195 * If thread exited earlier
3196 * there's nothing to be done.
3197 */
3198 if (!ext4_li_info || !ext4_lazyinit_task)
3199 return;
3200
3201 kthread_stop(ext4_lazyinit_task);
3202}
3203
3204static int set_journal_csum_feature_set(struct super_block *sb)
3205{
3206 int ret = 1;
3207 int compat, incompat;
3208 struct ext4_sb_info *sbi = EXT4_SB(sb);
3209
3210 if (ext4_has_metadata_csum(sb)) {
3211 /* journal checksum v3 */
3212 compat = 0;
3213 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
3214 } else {
3215 /* journal checksum v1 */
3216 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3217 incompat = 0;
3218 }
3219
3220 jbd2_journal_clear_features(sbi->s_journal,
3221 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3222 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3223 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3224 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3225 ret = jbd2_journal_set_features(sbi->s_journal,
3226 compat, 0,
3227 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3228 incompat);
3229 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3230 ret = jbd2_journal_set_features(sbi->s_journal,
3231 compat, 0,
3232 incompat);
3233 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3234 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3235 } else {
3236 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3237 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3238 }
3239
3240 return ret;
3241}
3242
3243/*
3244 * Note: calculating the overhead so we can be compatible with
3245 * historical BSD practice is quite difficult in the face of
3246 * clusters/bigalloc. This is because multiple metadata blocks from
3247 * different block group can end up in the same allocation cluster.
3248 * Calculating the exact overhead in the face of clustered allocation
3249 * requires either O(all block bitmaps) in memory or O(number of block
3250 * groups**2) in time. We will still calculate the superblock for
3251 * older file systems --- and if we come across with a bigalloc file
3252 * system with zero in s_overhead_clusters the estimate will be close to
3253 * correct especially for very large cluster sizes --- but for newer
3254 * file systems, it's better to calculate this figure once at mkfs
3255 * time, and store it in the superblock. If the superblock value is
3256 * present (even for non-bigalloc file systems), we will use it.
3257 */
3258static int count_overhead(struct super_block *sb, ext4_group_t grp,
3259 char *buf)
3260{
3261 struct ext4_sb_info *sbi = EXT4_SB(sb);
3262 struct ext4_group_desc *gdp;
3263 ext4_fsblk_t first_block, last_block, b;
3264 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3265 int s, j, count = 0;
3266
3267 if (!ext4_has_feature_bigalloc(sb))
3268 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3269 sbi->s_itb_per_group + 2);
3270
3271 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3272 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3273 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3274 for (i = 0; i < ngroups; i++) {
3275 gdp = ext4_get_group_desc(sb, i, NULL);
3276 b = ext4_block_bitmap(sb, gdp);
3277 if (b >= first_block && b <= last_block) {
3278 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3279 count++;
3280 }
3281 b = ext4_inode_bitmap(sb, gdp);
3282 if (b >= first_block && b <= last_block) {
3283 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3284 count++;
3285 }
3286 b = ext4_inode_table(sb, gdp);
3287 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3288 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3289 int c = EXT4_B2C(sbi, b - first_block);
3290 ext4_set_bit(c, buf);
3291 count++;
3292 }
3293 if (i != grp)
3294 continue;
3295 s = 0;
3296 if (ext4_bg_has_super(sb, grp)) {
3297 ext4_set_bit(s++, buf);
3298 count++;
3299 }
3300 j = ext4_bg_num_gdb(sb, grp);
3301 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
3302 ext4_error(sb, "Invalid number of block group "
3303 "descriptor blocks: %d", j);
3304 j = EXT4_BLOCKS_PER_GROUP(sb) - s;
3305 }
3306 count += j;
3307 for (; j > 0; j--)
3308 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3309 }
3310 if (!count)
3311 return 0;
3312 return EXT4_CLUSTERS_PER_GROUP(sb) -
3313 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3314}
3315
3316/*
3317 * Compute the overhead and stash it in sbi->s_overhead
3318 */
3319int ext4_calculate_overhead(struct super_block *sb)
3320{
3321 struct ext4_sb_info *sbi = EXT4_SB(sb);
3322 struct ext4_super_block *es = sbi->s_es;
3323 struct inode *j_inode;
3324 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
3325 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3326 ext4_fsblk_t overhead = 0;
3327 char *buf = (char *) get_zeroed_page(GFP_NOFS);
3328
3329 if (!buf)
3330 return -ENOMEM;
3331
3332 /*
3333 * Compute the overhead (FS structures). This is constant
3334 * for a given filesystem unless the number of block groups
3335 * changes so we cache the previous value until it does.
3336 */
3337
3338 /*
3339 * All of the blocks before first_data_block are overhead
3340 */
3341 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3342
3343 /*
3344 * Add the overhead found in each block group
3345 */
3346 for (i = 0; i < ngroups; i++) {
3347 int blks;
3348
3349 blks = count_overhead(sb, i, buf);
3350 overhead += blks;
3351 if (blks)
3352 memset(buf, 0, PAGE_SIZE);
3353 cond_resched();
3354 }
3355
3356 /*
3357 * Add the internal journal blocks whether the journal has been
3358 * loaded or not
3359 */
3360 if (sbi->s_journal && !sbi->journal_bdev)
3361 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3362 else if (ext4_has_feature_journal(sb) && !sbi->s_journal) {
3363 j_inode = ext4_get_journal_inode(sb, j_inum);
3364 if (j_inode) {
3365 j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
3366 overhead += EXT4_NUM_B2C(sbi, j_blocks);
3367 iput(j_inode);
3368 } else {
3369 ext4_msg(sb, KERN_ERR, "can't get journal size");
3370 }
3371 }
3372 sbi->s_overhead = overhead;
3373 smp_wmb();
3374 free_page((unsigned long) buf);
3375 return 0;
3376}
3377
3378static void ext4_set_resv_clusters(struct super_block *sb)
3379{
3380 ext4_fsblk_t resv_clusters;
3381 struct ext4_sb_info *sbi = EXT4_SB(sb);
3382
3383 /*
3384 * There's no need to reserve anything when we aren't using extents.
3385 * The space estimates are exact, there are no unwritten extents,
3386 * hole punching doesn't need new metadata... This is needed especially
3387 * to keep ext2/3 backward compatibility.
3388 */
3389 if (!ext4_has_feature_extents(sb))
3390 return;
3391 /*
3392 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3393 * This should cover the situations where we can not afford to run
3394 * out of space like for example punch hole, or converting
3395 * unwritten extents in delalloc path. In most cases such
3396 * allocation would require 1, or 2 blocks, higher numbers are
3397 * very rare.
3398 */
3399 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3400 sbi->s_cluster_bits);
3401
3402 do_div(resv_clusters, 50);
3403 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3404
3405 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
3406}
3407
3408static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3409{
3410 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
3411 char *orig_data = kstrdup(data, GFP_KERNEL);
3412 struct buffer_head *bh;
3413 struct ext4_super_block *es = NULL;
3414 struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3415 ext4_fsblk_t block;
3416 ext4_fsblk_t sb_block = get_sb_block(&data);
3417 ext4_fsblk_t logical_sb_block;
3418 unsigned long offset = 0;
3419 unsigned long journal_devnum = 0;
3420 unsigned long def_mount_opts;
3421 struct inode *root;
3422 const char *descr;
3423 int ret = -ENOMEM;
3424 int blocksize, clustersize;
3425 unsigned int db_count;
3426 unsigned int i;
3427 int needs_recovery, has_huge_files, has_bigalloc;
3428 __u64 blocks_count;
3429 int err = 0;
3430 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3431 ext4_group_t first_not_zeroed;
3432
3433 if ((data && !orig_data) || !sbi)
3434 goto out_free_base;
3435
3436 sbi->s_daxdev = dax_dev;
3437 sbi->s_blockgroup_lock =
3438 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3439 if (!sbi->s_blockgroup_lock)
3440 goto out_free_base;
3441
3442 sb->s_fs_info = sbi;
3443 sbi->s_sb = sb;
3444 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3445 sbi->s_sb_block = sb_block;
3446 if (sb->s_bdev->bd_part)
3447 sbi->s_sectors_written_start =
3448 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3449
3450 /* Cleanup superblock name */
3451 strreplace(sb->s_id, '/', '!');
3452
3453 /* -EINVAL is default */
3454 ret = -EINVAL;
3455 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3456 if (!blocksize) {
3457 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3458 goto out_fail;
3459 }
3460
3461 /*
3462 * The ext4 superblock will not be buffer aligned for other than 1kB
3463 * block sizes. We need to calculate the offset from buffer start.
3464 */
3465 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3466 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3467 offset = do_div(logical_sb_block, blocksize);
3468 } else {
3469 logical_sb_block = sb_block;
3470 }
3471
3472 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
3473 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3474 goto out_fail;
3475 }
3476 /*
3477 * Note: s_es must be initialized as soon as possible because
3478 * some ext4 macro-instructions depend on its value
3479 */
3480 es = (struct ext4_super_block *) (bh->b_data + offset);
3481 sbi->s_es = es;
3482 sb->s_magic = le16_to_cpu(es->s_magic);
3483 if (sb->s_magic != EXT4_SUPER_MAGIC)
3484 goto cantfind_ext4;
3485 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3486
3487 /* Warn if metadata_csum and gdt_csum are both set. */
3488 if (ext4_has_feature_metadata_csum(sb) &&
3489 ext4_has_feature_gdt_csum(sb))
3490 ext4_warning(sb, "metadata_csum and uninit_bg are "
3491 "redundant flags; please run fsck.");
3492
3493 /* Check for a known checksum algorithm */
3494 if (!ext4_verify_csum_type(sb, es)) {
3495 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3496 "unknown checksum algorithm.");
3497 silent = 1;
3498 goto cantfind_ext4;
3499 }
3500
3501 /* Load the checksum driver */
3502 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3503 if (IS_ERR(sbi->s_chksum_driver)) {
3504 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3505 ret = PTR_ERR(sbi->s_chksum_driver);
3506 sbi->s_chksum_driver = NULL;
3507 goto failed_mount;
3508 }
3509
3510 /* Check superblock checksum */
3511 if (!ext4_superblock_csum_verify(sb, es)) {
3512 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3513 "invalid superblock checksum. Run e2fsck?");
3514 silent = 1;
3515 ret = -EFSBADCRC;
3516 goto cantfind_ext4;
3517 }
3518
3519 /* Precompute checksum seed for all metadata */
3520 if (ext4_has_feature_csum_seed(sb))
3521 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
3522 else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
3523 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3524 sizeof(es->s_uuid));
3525
3526 /* Set defaults before we parse the mount options */
3527 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3528 set_opt(sb, INIT_INODE_TABLE);
3529 if (def_mount_opts & EXT4_DEFM_DEBUG)
3530 set_opt(sb, DEBUG);
3531 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3532 set_opt(sb, GRPID);
3533 if (def_mount_opts & EXT4_DEFM_UID16)
3534 set_opt(sb, NO_UID32);
3535 /* xattr user namespace & acls are now defaulted on */
3536 set_opt(sb, XATTR_USER);
3537#ifdef CONFIG_EXT4_FS_POSIX_ACL
3538 set_opt(sb, POSIX_ACL);
3539#endif
3540 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3541 if (ext4_has_metadata_csum(sb))
3542 set_opt(sb, JOURNAL_CHECKSUM);
3543
3544 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3545 set_opt(sb, JOURNAL_DATA);
3546 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3547 set_opt(sb, ORDERED_DATA);
3548 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3549 set_opt(sb, WRITEBACK_DATA);
3550
3551 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3552 set_opt(sb, ERRORS_PANIC);
3553 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3554 set_opt(sb, ERRORS_CONT);
3555 else
3556 set_opt(sb, ERRORS_RO);
3557 /* block_validity enabled by default; disable with noblock_validity */
3558 set_opt(sb, BLOCK_VALIDITY);
3559 if (def_mount_opts & EXT4_DEFM_DISCARD)
3560 set_opt(sb, DISCARD);
3561
3562 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3563 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
3564 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3565 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3566 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3567
3568 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3569 set_opt(sb, BARRIER);
3570
3571 /*
3572 * enable delayed allocation by default
3573 * Use -o nodelalloc to turn it off
3574 */
3575 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3576 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3577 set_opt(sb, DELALLOC);
3578
3579 /*
3580 * set default s_li_wait_mult for lazyinit, for the case there is
3581 * no mount option specified.
3582 */
3583 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3584
3585 if (sbi->s_es->s_mount_opts[0]) {
3586 char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
3587 sizeof(sbi->s_es->s_mount_opts),
3588 GFP_KERNEL);
3589 if (!s_mount_opts)
3590 goto failed_mount;
3591 if (!parse_options(s_mount_opts, sb, &journal_devnum,
3592 &journal_ioprio, 0)) {
3593 ext4_msg(sb, KERN_WARNING,
3594 "failed to parse options in superblock: %s",
3595 s_mount_opts);
3596 }
3597 kfree(s_mount_opts);
3598 }
3599 sbi->s_def_mount_opt = sbi->s_mount_opt;
3600 if (!parse_options((char *) data, sb, &journal_devnum,
3601 &journal_ioprio, 0))
3602 goto failed_mount;
3603
3604 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3605 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3606 "with data=journal disables delayed "
3607 "allocation and O_DIRECT support!\n");
3608 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3609 ext4_msg(sb, KERN_ERR, "can't mount with "
3610 "both data=journal and delalloc");
3611 goto failed_mount;
3612 }
3613 if (test_opt(sb, DIOREAD_NOLOCK)) {
3614 ext4_msg(sb, KERN_ERR, "can't mount with "
3615 "both data=journal and dioread_nolock");
3616 goto failed_mount;
3617 }
3618 if (test_opt(sb, DAX)) {
3619 ext4_msg(sb, KERN_ERR, "can't mount with "
3620 "both data=journal and dax");
3621 goto failed_mount;
3622 }
3623 if (ext4_has_feature_encrypt(sb)) {
3624 ext4_msg(sb, KERN_WARNING,
3625 "encrypted files will use data=ordered "
3626 "instead of data journaling mode");
3627 }
3628 if (test_opt(sb, DELALLOC))
3629 clear_opt(sb, DELALLOC);
3630 } else {
3631 sb->s_iflags |= SB_I_CGROUPWB;
3632 }
3633
3634 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
3635 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
3636
3637 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3638 (ext4_has_compat_features(sb) ||
3639 ext4_has_ro_compat_features(sb) ||
3640 ext4_has_incompat_features(sb)))
3641 ext4_msg(sb, KERN_WARNING,
3642 "feature flags set on rev 0 fs, "
3643 "running e2fsck is recommended");
3644
3645 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3646 set_opt2(sb, HURD_COMPAT);
3647 if (ext4_has_feature_64bit(sb)) {
3648 ext4_msg(sb, KERN_ERR,
3649 "The Hurd can't support 64-bit file systems");
3650 goto failed_mount;
3651 }
3652
3653 /*
3654 * ea_inode feature uses l_i_version field which is not
3655 * available in HURD_COMPAT mode.
3656 */
3657 if (ext4_has_feature_ea_inode(sb)) {
3658 ext4_msg(sb, KERN_ERR,
3659 "ea_inode feature is not supported for Hurd");
3660 goto failed_mount;
3661 }
3662 }
3663
3664 if (IS_EXT2_SB(sb)) {
3665 if (ext2_feature_set_ok(sb))
3666 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3667 "using the ext4 subsystem");
3668 else {
3669 /*
3670 * If we're probing be silent, if this looks like
3671 * it's actually an ext[34] filesystem.
3672 */
3673 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
3674 goto failed_mount;
3675 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3676 "to feature incompatibilities");
3677 goto failed_mount;
3678 }
3679 }
3680
3681 if (IS_EXT3_SB(sb)) {
3682 if (ext3_feature_set_ok(sb))
3683 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3684 "using the ext4 subsystem");
3685 else {
3686 /*
3687 * If we're probing be silent, if this looks like
3688 * it's actually an ext4 filesystem.
3689 */
3690 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
3691 goto failed_mount;
3692 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3693 "to feature incompatibilities");
3694 goto failed_mount;
3695 }
3696 }
3697
3698 /*
3699 * Check feature flags regardless of the revision level, since we
3700 * previously didn't change the revision level when setting the flags,
3701 * so there is a chance incompat flags are set on a rev 0 filesystem.
3702 */
3703 if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))
3704 goto failed_mount;
3705
3706 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3707 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3708 blocksize > EXT4_MAX_BLOCK_SIZE) {
3709 ext4_msg(sb, KERN_ERR,
3710 "Unsupported filesystem blocksize %d (%d log_block_size)",
3711 blocksize, le32_to_cpu(es->s_log_block_size));
3712 goto failed_mount;
3713 }
3714 if (le32_to_cpu(es->s_log_block_size) >
3715 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3716 ext4_msg(sb, KERN_ERR,
3717 "Invalid log block size: %u",
3718 le32_to_cpu(es->s_log_block_size));
3719 goto failed_mount;
3720 }
3721
3722 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
3723 ext4_msg(sb, KERN_ERR,
3724 "Number of reserved GDT blocks insanely large: %d",
3725 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
3726 goto failed_mount;
3727 }
3728
3729 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
3730 if (ext4_has_feature_inline_data(sb)) {
3731 ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
3732 " that may contain inline data");
3733 sbi->s_mount_opt &= ~EXT4_MOUNT_DAX;
3734 }
3735 err = bdev_dax_supported(sb, blocksize);
3736 if (err) {
3737 ext4_msg(sb, KERN_ERR,
3738 "DAX unsupported by block device. Turning off DAX.");
3739 sbi->s_mount_opt &= ~EXT4_MOUNT_DAX;
3740 }
3741 }
3742
3743 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
3744 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3745 es->s_encryption_level);
3746 goto failed_mount;
3747 }
3748
3749 if (sb->s_blocksize != blocksize) {
3750 /* Validate the filesystem blocksize */
3751 if (!sb_set_blocksize(sb, blocksize)) {
3752 ext4_msg(sb, KERN_ERR, "bad block size %d",
3753 blocksize);
3754 goto failed_mount;
3755 }
3756
3757 brelse(bh);
3758 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3759 offset = do_div(logical_sb_block, blocksize);
3760 bh = sb_bread_unmovable(sb, logical_sb_block);
3761 if (!bh) {
3762 ext4_msg(sb, KERN_ERR,
3763 "Can't read superblock on 2nd try");
3764 goto failed_mount;
3765 }
3766 es = (struct ext4_super_block *)(bh->b_data + offset);
3767 sbi->s_es = es;
3768 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3769 ext4_msg(sb, KERN_ERR,
3770 "Magic mismatch, very weird!");
3771 goto failed_mount;
3772 }
3773 }
3774
3775 has_huge_files = ext4_has_feature_huge_file(sb);
3776 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3777 has_huge_files);
3778 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
3779
3780 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3781 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3782 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3783 } else {
3784 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3785 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3786 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3787 (!is_power_of_2(sbi->s_inode_size)) ||
3788 (sbi->s_inode_size > blocksize)) {
3789 ext4_msg(sb, KERN_ERR,
3790 "unsupported inode size: %d",
3791 sbi->s_inode_size);
3792 goto failed_mount;
3793 }
3794 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3795 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3796 }
3797
3798 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3799 if (ext4_has_feature_64bit(sb)) {
3800 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3801 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
3802 !is_power_of_2(sbi->s_desc_size)) {
3803 ext4_msg(sb, KERN_ERR,
3804 "unsupported descriptor size %lu",
3805 sbi->s_desc_size);
3806 goto failed_mount;
3807 }
3808 } else
3809 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3810
3811 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
3812 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
3813
3814 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3815 if (sbi->s_inodes_per_block == 0)
3816 goto cantfind_ext4;
3817 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
3818 sbi->s_inodes_per_group > blocksize * 8) {
3819 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
3820 sbi->s_blocks_per_group);
3821 goto failed_mount;
3822 }
3823 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3824 sbi->s_inodes_per_block;
3825 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3826 sbi->s_sbh = bh;
3827 sbi->s_mount_state = le16_to_cpu(es->s_state);
3828 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3829 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3830
3831 for (i = 0; i < 4; i++)
3832 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3833 sbi->s_def_hash_version = es->s_def_hash_version;
3834 if (ext4_has_feature_dir_index(sb)) {
3835 i = le32_to_cpu(es->s_flags);
3836 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3837 sbi->s_hash_unsigned = 3;
3838 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3839#ifdef __CHAR_UNSIGNED__
3840 if (!sb_rdonly(sb))
3841 es->s_flags |=
3842 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3843 sbi->s_hash_unsigned = 3;
3844#else
3845 if (!sb_rdonly(sb))
3846 es->s_flags |=
3847 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3848#endif
3849 }
3850 }
3851
3852 /* Handle clustersize */
3853 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3854 has_bigalloc = ext4_has_feature_bigalloc(sb);
3855 if (has_bigalloc) {
3856 if (clustersize < blocksize) {
3857 ext4_msg(sb, KERN_ERR,
3858 "cluster size (%d) smaller than "
3859 "block size (%d)", clustersize, blocksize);
3860 goto failed_mount;
3861 }
3862 if (le32_to_cpu(es->s_log_cluster_size) >
3863 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3864 ext4_msg(sb, KERN_ERR,
3865 "Invalid log cluster size: %u",
3866 le32_to_cpu(es->s_log_cluster_size));
3867 goto failed_mount;
3868 }
3869 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3870 le32_to_cpu(es->s_log_block_size);
3871 sbi->s_clusters_per_group =
3872 le32_to_cpu(es->s_clusters_per_group);
3873 if (sbi->s_clusters_per_group > blocksize * 8) {
3874 ext4_msg(sb, KERN_ERR,
3875 "#clusters per group too big: %lu",
3876 sbi->s_clusters_per_group);
3877 goto failed_mount;
3878 }
3879 if (sbi->s_blocks_per_group !=
3880 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3881 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3882 "clusters per group (%lu) inconsistent",
3883 sbi->s_blocks_per_group,
3884 sbi->s_clusters_per_group);
3885 goto failed_mount;
3886 }
3887 } else {
3888 if (clustersize != blocksize) {
3889 ext4_warning(sb, "fragment/cluster size (%d) != "
3890 "block size (%d)", clustersize,
3891 blocksize);
3892 clustersize = blocksize;
3893 }
3894 if (sbi->s_blocks_per_group > blocksize * 8) {
3895 ext4_msg(sb, KERN_ERR,
3896 "#blocks per group too big: %lu",
3897 sbi->s_blocks_per_group);
3898 goto failed_mount;
3899 }
3900 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3901 sbi->s_cluster_bits = 0;
3902 }
3903 sbi->s_cluster_ratio = clustersize / blocksize;
3904
3905 /* Do we have standard group size of clustersize * 8 blocks ? */
3906 if (sbi->s_blocks_per_group == clustersize << 3)
3907 set_opt2(sb, STD_GROUP_SIZE);
3908
3909 /*
3910 * Test whether we have more sectors than will fit in sector_t,
3911 * and whether the max offset is addressable by the page cache.
3912 */
3913 err = generic_check_addressable(sb->s_blocksize_bits,
3914 ext4_blocks_count(es));
3915 if (err) {
3916 ext4_msg(sb, KERN_ERR, "filesystem"
3917 " too large to mount safely on this system");
3918 if (sizeof(sector_t) < 8)
3919 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3920 goto failed_mount;
3921 }
3922
3923 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3924 goto cantfind_ext4;
3925
3926 /* check blocks count against device size */
3927 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3928 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
3929 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3930 "exceeds size of device (%llu blocks)",
3931 ext4_blocks_count(es), blocks_count);
3932 goto failed_mount;
3933 }
3934
3935 /*
3936 * It makes no sense for the first data block to be beyond the end
3937 * of the filesystem.
3938 */
3939 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
3940 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3941 "block %u is beyond end of filesystem (%llu)",
3942 le32_to_cpu(es->s_first_data_block),
3943 ext4_blocks_count(es));
3944 goto failed_mount;
3945 }
3946 blocks_count = (ext4_blocks_count(es) -
3947 le32_to_cpu(es->s_first_data_block) +
3948 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3949 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
3950 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3951 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3952 "(block count %llu, first data block %u, "
3953 "blocks per group %lu)", sbi->s_groups_count,
3954 ext4_blocks_count(es),
3955 le32_to_cpu(es->s_first_data_block),
3956 EXT4_BLOCKS_PER_GROUP(sb));
3957 goto failed_mount;
3958 }
3959 sbi->s_groups_count = blocks_count;
3960 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3961 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3962 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3963 EXT4_DESC_PER_BLOCK(sb);
3964 if (ext4_has_feature_meta_bg(sb)) {
3965 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
3966 ext4_msg(sb, KERN_WARNING,
3967 "first meta block group too large: %u "
3968 "(group descriptor block count %u)",
3969 le32_to_cpu(es->s_first_meta_bg), db_count);
3970 goto failed_mount;
3971 }
3972 }
3973 sbi->s_group_desc = kvmalloc(db_count *
3974 sizeof(struct buffer_head *),
3975 GFP_KERNEL);
3976 if (sbi->s_group_desc == NULL) {
3977 ext4_msg(sb, KERN_ERR, "not enough memory");
3978 ret = -ENOMEM;
3979 goto failed_mount;
3980 }
3981
3982 bgl_lock_init(sbi->s_blockgroup_lock);
3983
3984 /* Pre-read the descriptors into the buffer cache */
3985 for (i = 0; i < db_count; i++) {
3986 block = descriptor_loc(sb, logical_sb_block, i);
3987 sb_breadahead(sb, block);
3988 }
3989
3990 for (i = 0; i < db_count; i++) {
3991 block = descriptor_loc(sb, logical_sb_block, i);
3992 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
3993 if (!sbi->s_group_desc[i]) {
3994 ext4_msg(sb, KERN_ERR,
3995 "can't read group descriptor %d", i);
3996 db_count = i;
3997 goto failed_mount2;
3998 }
3999 }
4000 if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
4001 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
4002 ret = -EFSCORRUPTED;
4003 goto failed_mount2;
4004 }
4005
4006 sbi->s_gdb_count = db_count;
4007
4008 timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
4009
4010 /* Register extent status tree shrinker */
4011 if (ext4_es_register_shrinker(sbi))
4012 goto failed_mount3;
4013
4014 sbi->s_stripe = ext4_get_stripe_size(sbi);
4015 sbi->s_extent_max_zeroout_kb = 32;
4016
4017 /*
4018 * set up enough so that it can read an inode
4019 */
4020 sb->s_op = &ext4_sops;
4021 sb->s_export_op = &ext4_export_ops;
4022 sb->s_xattr = ext4_xattr_handlers;
4023#ifdef CONFIG_EXT4_FS_ENCRYPTION
4024 sb->s_cop = &ext4_cryptops;
4025#endif
4026#ifdef CONFIG_QUOTA
4027 sb->dq_op = &ext4_quota_operations;
4028 if (ext4_has_feature_quota(sb))
4029 sb->s_qcop = &dquot_quotactl_sysfile_ops;
4030 else
4031 sb->s_qcop = &ext4_qctl_operations;
4032 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
4033#endif
4034 memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
4035
4036 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
4037 mutex_init(&sbi->s_orphan_lock);
4038
4039 sb->s_root = NULL;
4040
4041 needs_recovery = (es->s_last_orphan != 0 ||
4042 ext4_has_feature_journal_needs_recovery(sb));
4043
4044 if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb))
4045 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
4046 goto failed_mount3a;
4047
4048 /*
4049 * The first inode we look at is the journal inode. Don't try
4050 * root first: it may be modified in the journal!
4051 */
4052 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
4053 err = ext4_load_journal(sb, es, journal_devnum);
4054 if (err)
4055 goto failed_mount3a;
4056 } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&
4057 ext4_has_feature_journal_needs_recovery(sb)) {
4058 ext4_msg(sb, KERN_ERR, "required journal recovery "
4059 "suppressed and not mounted read-only");
4060 goto failed_mount_wq;
4061 } else {
4062 /* Nojournal mode, all journal mount options are illegal */
4063 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
4064 ext4_msg(sb, KERN_ERR, "can't mount with "
4065 "journal_checksum, fs mounted w/o journal");
4066 goto failed_mount_wq;
4067 }
4068 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4069 ext4_msg(sb, KERN_ERR, "can't mount with "
4070 "journal_async_commit, fs mounted w/o journal");
4071 goto failed_mount_wq;
4072 }
4073 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
4074 ext4_msg(sb, KERN_ERR, "can't mount with "
4075 "commit=%lu, fs mounted w/o journal",
4076 sbi->s_commit_interval / HZ);
4077 goto failed_mount_wq;
4078 }
4079 if (EXT4_MOUNT_DATA_FLAGS &
4080 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
4081 ext4_msg(sb, KERN_ERR, "can't mount with "
4082 "data=, fs mounted w/o journal");
4083 goto failed_mount_wq;
4084 }
4085 sbi->s_def_mount_opt &= EXT4_MOUNT_JOURNAL_CHECKSUM;
4086 clear_opt(sb, JOURNAL_CHECKSUM);
4087 clear_opt(sb, DATA_FLAGS);
4088 sbi->s_journal = NULL;
4089 needs_recovery = 0;
4090 goto no_journal;
4091 }
4092
4093 if (ext4_has_feature_64bit(sb) &&
4094 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4095 JBD2_FEATURE_INCOMPAT_64BIT)) {
4096 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
4097 goto failed_mount_wq;
4098 }
4099
4100 if (!set_journal_csum_feature_set(sb)) {
4101 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4102 "feature set");
4103 goto failed_mount_wq;
4104 }
4105
4106 /* We have now updated the journal if required, so we can
4107 * validate the data journaling mode. */
4108 switch (test_opt(sb, DATA_FLAGS)) {
4109 case 0:
4110 /* No mode set, assume a default based on the journal
4111 * capabilities: ORDERED_DATA if the journal can
4112 * cope, else JOURNAL_DATA
4113 */
4114 if (jbd2_journal_check_available_features
4115 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4116 set_opt(sb, ORDERED_DATA);
4117 sbi->s_def_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
4118 } else {
4119 set_opt(sb, JOURNAL_DATA);
4120 sbi->s_def_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
4121 }
4122 break;
4123
4124 case EXT4_MOUNT_ORDERED_DATA:
4125 case EXT4_MOUNT_WRITEBACK_DATA:
4126 if (!jbd2_journal_check_available_features
4127 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4128 ext4_msg(sb, KERN_ERR, "Journal does not support "
4129 "requested data journaling mode");
4130 goto failed_mount_wq;
4131 }
4132 default:
4133 break;
4134 }
4135
4136 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4137 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4138 ext4_msg(sb, KERN_ERR, "can't mount with "
4139 "journal_async_commit in data=ordered mode");
4140 goto failed_mount_wq;
4141 }
4142
4143 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4144
4145 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4146
4147no_journal:
4148 if (!test_opt(sb, NO_MBCACHE)) {
4149 sbi->s_ea_block_cache = ext4_xattr_create_cache();
4150 if (!sbi->s_ea_block_cache) {
4151 ext4_msg(sb, KERN_ERR,
4152 "Failed to create ea_block_cache");
4153 goto failed_mount_wq;
4154 }
4155
4156 if (ext4_has_feature_ea_inode(sb)) {
4157 sbi->s_ea_inode_cache = ext4_xattr_create_cache();
4158 if (!sbi->s_ea_inode_cache) {
4159 ext4_msg(sb, KERN_ERR,
4160 "Failed to create ea_inode_cache");
4161 goto failed_mount_wq;
4162 }
4163 }
4164 }
4165
4166 if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
4167 (blocksize != PAGE_SIZE)) {
4168 ext4_msg(sb, KERN_ERR,
4169 "Unsupported blocksize for fs encryption");
4170 goto failed_mount_wq;
4171 }
4172
4173 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !sb_rdonly(sb) &&
4174 !ext4_has_feature_encrypt(sb)) {
4175 ext4_set_feature_encrypt(sb);
4176 ext4_commit_super(sb, 1);
4177 }
4178
4179 /*
4180 * Get the # of file system overhead blocks from the
4181 * superblock if present.
4182 */
4183 if (es->s_overhead_clusters)
4184 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4185 else {
4186 err = ext4_calculate_overhead(sb);
4187 if (err)
4188 goto failed_mount_wq;
4189 }
4190
4191 /*
4192 * The maximum number of concurrent works can be high and
4193 * concurrency isn't really necessary. Limit it to 1.
4194 */
4195 EXT4_SB(sb)->rsv_conversion_wq =
4196 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4197 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4198 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
4199 ret = -ENOMEM;
4200 goto failed_mount4;
4201 }
4202
4203 /*
4204 * The jbd2_journal_load will have done any necessary log recovery,
4205 * so we can safely mount the rest of the filesystem now.
4206 */
4207
4208 root = ext4_iget(sb, EXT4_ROOT_INO);
4209 if (IS_ERR(root)) {
4210 ext4_msg(sb, KERN_ERR, "get root inode failed");
4211 ret = PTR_ERR(root);
4212 root = NULL;
4213 goto failed_mount4;
4214 }
4215 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
4216 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
4217 iput(root);
4218 goto failed_mount4;
4219 }
4220 sb->s_root = d_make_root(root);
4221 if (!sb->s_root) {
4222 ext4_msg(sb, KERN_ERR, "get root dentry failed");
4223 ret = -ENOMEM;
4224 goto failed_mount4;
4225 }
4226
4227 if (ext4_setup_super(sb, es, sb_rdonly(sb)))
4228 sb->s_flags |= SB_RDONLY;
4229
4230 /* determine the minimum size of new large inodes, if present */
4231 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE &&
4232 sbi->s_want_extra_isize == 0) {
4233 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4234 EXT4_GOOD_OLD_INODE_SIZE;
4235 if (ext4_has_feature_extra_isize(sb)) {
4236 if (sbi->s_want_extra_isize <
4237 le16_to_cpu(es->s_want_extra_isize))
4238 sbi->s_want_extra_isize =
4239 le16_to_cpu(es->s_want_extra_isize);
4240 if (sbi->s_want_extra_isize <
4241 le16_to_cpu(es->s_min_extra_isize))
4242 sbi->s_want_extra_isize =
4243 le16_to_cpu(es->s_min_extra_isize);
4244 }
4245 }
4246 /* Check if enough inode space is available */
4247 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
4248 sbi->s_inode_size) {
4249 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4250 EXT4_GOOD_OLD_INODE_SIZE;
4251 ext4_msg(sb, KERN_INFO, "required extra inode space not"
4252 "available");
4253 }
4254
4255 ext4_set_resv_clusters(sb);
4256
4257 err = ext4_setup_system_zone(sb);
4258 if (err) {
4259 ext4_msg(sb, KERN_ERR, "failed to initialize system "
4260 "zone (%d)", err);
4261 goto failed_mount4a;
4262 }
4263
4264 ext4_ext_init(sb);
4265 err = ext4_mb_init(sb);
4266 if (err) {
4267 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4268 err);
4269 goto failed_mount5;
4270 }
4271
4272 block = ext4_count_free_clusters(sb);
4273 ext4_free_blocks_count_set(sbi->s_es,
4274 EXT4_C2B(sbi, block));
4275 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4276 GFP_KERNEL);
4277 if (!err) {
4278 unsigned long freei = ext4_count_free_inodes(sb);
4279 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
4280 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4281 GFP_KERNEL);
4282 }
4283 if (!err)
4284 err = percpu_counter_init(&sbi->s_dirs_counter,
4285 ext4_count_dirs(sb), GFP_KERNEL);
4286 if (!err)
4287 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4288 GFP_KERNEL);
4289 if (!err)
4290 err = percpu_init_rwsem(&sbi->s_journal_flag_rwsem);
4291
4292 if (err) {
4293 ext4_msg(sb, KERN_ERR, "insufficient memory");
4294 goto failed_mount6;
4295 }
4296
4297 if (ext4_has_feature_flex_bg(sb))
4298 if (!ext4_fill_flex_info(sb)) {
4299 ext4_msg(sb, KERN_ERR,
4300 "unable to initialize "
4301 "flex_bg meta info!");
4302 goto failed_mount6;
4303 }
4304
4305 err = ext4_register_li_request(sb, first_not_zeroed);
4306 if (err)
4307 goto failed_mount6;
4308
4309 err = ext4_register_sysfs(sb);
4310 if (err)
4311 goto failed_mount7;
4312
4313#ifdef CONFIG_QUOTA
4314 /* Enable quota usage during mount. */
4315 if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
4316 err = ext4_enable_quotas(sb);
4317 if (err)
4318 goto failed_mount8;
4319 }
4320#endif /* CONFIG_QUOTA */
4321
4322 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4323 ext4_orphan_cleanup(sb, es);
4324 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
4325 if (needs_recovery) {
4326 ext4_msg(sb, KERN_INFO, "recovery complete");
4327 ext4_mark_recovery_complete(sb, es);
4328 }
4329 if (EXT4_SB(sb)->s_journal) {
4330 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4331 descr = " journalled data mode";
4332 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4333 descr = " ordered data mode";
4334 else
4335 descr = " writeback data mode";
4336 } else
4337 descr = "out journal";
4338
4339 if (test_opt(sb, DISCARD)) {
4340 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4341 if (!blk_queue_discard(q))
4342 ext4_msg(sb, KERN_WARNING,
4343 "mounting with \"discard\" option, but "
4344 "the device does not support discard");
4345 }
4346
4347 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
4348 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4349 "Opts: %.*s%s%s", descr,
4350 (int) sizeof(sbi->s_es->s_mount_opts),
4351 sbi->s_es->s_mount_opts,
4352 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
4353
4354 if (es->s_error_count)
4355 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
4356
4357 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4358 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4359 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4360 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4361
4362 kfree(orig_data);
4363 return 0;
4364
4365cantfind_ext4:
4366 if (!silent)
4367 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4368 goto failed_mount;
4369
4370#ifdef CONFIG_QUOTA
4371failed_mount8:
4372 ext4_unregister_sysfs(sb);
4373#endif
4374failed_mount7:
4375 ext4_unregister_li_request(sb);
4376failed_mount6:
4377 ext4_mb_release(sb);
4378 if (sbi->s_flex_groups)
4379 kvfree(sbi->s_flex_groups);
4380 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4381 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4382 percpu_counter_destroy(&sbi->s_dirs_counter);
4383 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
4384failed_mount5:
4385 ext4_ext_release(sb);
4386 ext4_release_system_zone(sb);
4387failed_mount4a:
4388 dput(sb->s_root);
4389 sb->s_root = NULL;
4390failed_mount4:
4391 ext4_msg(sb, KERN_ERR, "mount failed");
4392 if (EXT4_SB(sb)->rsv_conversion_wq)
4393 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4394failed_mount_wq:
4395 if (sbi->s_ea_inode_cache) {
4396 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
4397 sbi->s_ea_inode_cache = NULL;
4398 }
4399 if (sbi->s_ea_block_cache) {
4400 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
4401 sbi->s_ea_block_cache = NULL;
4402 }
4403 if (sbi->s_journal) {
4404 jbd2_journal_destroy(sbi->s_journal);
4405 sbi->s_journal = NULL;
4406 }
4407failed_mount3a:
4408 ext4_es_unregister_shrinker(sbi);
4409failed_mount3:
4410 del_timer_sync(&sbi->s_err_report);
4411 if (sbi->s_mmp_tsk)
4412 kthread_stop(sbi->s_mmp_tsk);
4413failed_mount2:
4414 for (i = 0; i < db_count; i++)
4415 brelse(sbi->s_group_desc[i]);
4416 kvfree(sbi->s_group_desc);
4417failed_mount:
4418 if (sbi->s_chksum_driver)
4419 crypto_free_shash(sbi->s_chksum_driver);
4420#ifdef CONFIG_QUOTA
4421 for (i = 0; i < EXT4_MAXQUOTAS; i++)
4422 kfree(sbi->s_qf_names[i]);
4423#endif
4424 ext4_blkdev_remove(sbi);
4425 brelse(bh);
4426out_fail:
4427 sb->s_fs_info = NULL;
4428 kfree(sbi->s_blockgroup_lock);
4429out_free_base:
4430 kfree(sbi);
4431 kfree(orig_data);
4432 fs_put_dax(dax_dev);
4433 return err ? err : ret;
4434}
4435
4436/*
4437 * Setup any per-fs journal parameters now. We'll do this both on
4438 * initial mount, once the journal has been initialised but before we've
4439 * done any recovery; and again on any subsequent remount.
4440 */
4441static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4442{
4443 struct ext4_sb_info *sbi = EXT4_SB(sb);
4444
4445 journal->j_commit_interval = sbi->s_commit_interval;
4446 journal->j_min_batch_time = sbi->s_min_batch_time;
4447 journal->j_max_batch_time = sbi->s_max_batch_time;
4448
4449 write_lock(&journal->j_state_lock);
4450 if (test_opt(sb, BARRIER))
4451 journal->j_flags |= JBD2_BARRIER;
4452 else
4453 journal->j_flags &= ~JBD2_BARRIER;
4454 if (test_opt(sb, DATA_ERR_ABORT))
4455 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4456 else
4457 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4458 write_unlock(&journal->j_state_lock);
4459}
4460
4461static struct inode *ext4_get_journal_inode(struct super_block *sb,
4462 unsigned int journal_inum)
4463{
4464 struct inode *journal_inode;
4465
4466 /*
4467 * Test for the existence of a valid inode on disk. Bad things
4468 * happen if we iget() an unused inode, as the subsequent iput()
4469 * will try to delete it.
4470 */
4471 journal_inode = ext4_iget(sb, journal_inum);
4472 if (IS_ERR(journal_inode)) {
4473 ext4_msg(sb, KERN_ERR, "no journal found");
4474 return NULL;
4475 }
4476 if (!journal_inode->i_nlink) {
4477 make_bad_inode(journal_inode);
4478 iput(journal_inode);
4479 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4480 return NULL;
4481 }
4482
4483 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4484 journal_inode, journal_inode->i_size);
4485 if (!S_ISREG(journal_inode->i_mode)) {
4486 ext4_msg(sb, KERN_ERR, "invalid journal inode");
4487 iput(journal_inode);
4488 return NULL;
4489 }
4490 return journal_inode;
4491}
4492
4493static journal_t *ext4_get_journal(struct super_block *sb,
4494 unsigned int journal_inum)
4495{
4496 struct inode *journal_inode;
4497 journal_t *journal;
4498
4499 BUG_ON(!ext4_has_feature_journal(sb));
4500
4501 journal_inode = ext4_get_journal_inode(sb, journal_inum);
4502 if (!journal_inode)
4503 return NULL;
4504
4505 journal = jbd2_journal_init_inode(journal_inode);
4506 if (!journal) {
4507 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4508 iput(journal_inode);
4509 return NULL;
4510 }
4511 journal->j_private = sb;
4512 ext4_init_journal_params(sb, journal);
4513 return journal;
4514}
4515
4516static journal_t *ext4_get_dev_journal(struct super_block *sb,
4517 dev_t j_dev)
4518{
4519 struct buffer_head *bh;
4520 journal_t *journal;
4521 ext4_fsblk_t start;
4522 ext4_fsblk_t len;
4523 int hblock, blocksize;
4524 ext4_fsblk_t sb_block;
4525 unsigned long offset;
4526 struct ext4_super_block *es;
4527 struct block_device *bdev;
4528
4529 BUG_ON(!ext4_has_feature_journal(sb));
4530
4531 bdev = ext4_blkdev_get(j_dev, sb);
4532 if (bdev == NULL)
4533 return NULL;
4534
4535 blocksize = sb->s_blocksize;
4536 hblock = bdev_logical_block_size(bdev);
4537 if (blocksize < hblock) {
4538 ext4_msg(sb, KERN_ERR,
4539 "blocksize too small for journal device");
4540 goto out_bdev;
4541 }
4542
4543 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4544 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4545 set_blocksize(bdev, blocksize);
4546 if (!(bh = __bread(bdev, sb_block, blocksize))) {
4547 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4548 "external journal");
4549 goto out_bdev;
4550 }
4551
4552 es = (struct ext4_super_block *) (bh->b_data + offset);
4553 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4554 !(le32_to_cpu(es->s_feature_incompat) &
4555 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4556 ext4_msg(sb, KERN_ERR, "external journal has "
4557 "bad superblock");
4558 brelse(bh);
4559 goto out_bdev;
4560 }
4561
4562 if ((le32_to_cpu(es->s_feature_ro_compat) &
4563 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4564 es->s_checksum != ext4_superblock_csum(sb, es)) {
4565 ext4_msg(sb, KERN_ERR, "external journal has "
4566 "corrupt superblock");
4567 brelse(bh);
4568 goto out_bdev;
4569 }
4570
4571 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4572 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4573 brelse(bh);
4574 goto out_bdev;
4575 }
4576
4577 len = ext4_blocks_count(es);
4578 start = sb_block + 1;
4579 brelse(bh); /* we're done with the superblock */
4580
4581 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4582 start, len, blocksize);
4583 if (!journal) {
4584 ext4_msg(sb, KERN_ERR, "failed to create device journal");
4585 goto out_bdev;
4586 }
4587 journal->j_private = sb;
4588 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4589 wait_on_buffer(journal->j_sb_buffer);
4590 if (!buffer_uptodate(journal->j_sb_buffer)) {
4591 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4592 goto out_journal;
4593 }
4594 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4595 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4596 "user (unsupported) - %d",
4597 be32_to_cpu(journal->j_superblock->s_nr_users));
4598 goto out_journal;
4599 }
4600 EXT4_SB(sb)->journal_bdev = bdev;
4601 ext4_init_journal_params(sb, journal);
4602 return journal;
4603
4604out_journal:
4605 jbd2_journal_destroy(journal);
4606out_bdev:
4607 ext4_blkdev_put(bdev);
4608 return NULL;
4609}
4610
4611static int ext4_load_journal(struct super_block *sb,
4612 struct ext4_super_block *es,
4613 unsigned long journal_devnum)
4614{
4615 journal_t *journal;
4616 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4617 dev_t journal_dev;
4618 int err = 0;
4619 int really_read_only;
4620
4621 BUG_ON(!ext4_has_feature_journal(sb));
4622
4623 if (journal_devnum &&
4624 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4625 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4626 "numbers have changed");
4627 journal_dev = new_decode_dev(journal_devnum);
4628 } else
4629 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4630
4631 really_read_only = bdev_read_only(sb->s_bdev);
4632
4633 /*
4634 * Are we loading a blank journal or performing recovery after a
4635 * crash? For recovery, we need to check in advance whether we
4636 * can get read-write access to the device.
4637 */
4638 if (ext4_has_feature_journal_needs_recovery(sb)) {
4639 if (sb_rdonly(sb)) {
4640 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4641 "required on readonly filesystem");
4642 if (really_read_only) {
4643 ext4_msg(sb, KERN_ERR, "write access "
4644 "unavailable, cannot proceed "
4645 "(try mounting with noload)");
4646 return -EROFS;
4647 }
4648 ext4_msg(sb, KERN_INFO, "write access will "
4649 "be enabled during recovery");
4650 }
4651 }
4652
4653 if (journal_inum && journal_dev) {
4654 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4655 "and inode journals!");
4656 return -EINVAL;
4657 }
4658
4659 if (journal_inum) {
4660 if (!(journal = ext4_get_journal(sb, journal_inum)))
4661 return -EINVAL;
4662 } else {
4663 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4664 return -EINVAL;
4665 }
4666
4667 if (!(journal->j_flags & JBD2_BARRIER))
4668 ext4_msg(sb, KERN_INFO, "barriers disabled");
4669
4670 if (!ext4_has_feature_journal_needs_recovery(sb))
4671 err = jbd2_journal_wipe(journal, !really_read_only);
4672 if (!err) {
4673 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4674 if (save)
4675 memcpy(save, ((char *) es) +
4676 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
4677 err = jbd2_journal_load(journal);
4678 if (save)
4679 memcpy(((char *) es) + EXT4_S_ERR_START,
4680 save, EXT4_S_ERR_LEN);
4681 kfree(save);
4682 }
4683
4684 if (err) {
4685 ext4_msg(sb, KERN_ERR, "error loading journal");
4686 jbd2_journal_destroy(journal);
4687 return err;
4688 }
4689
4690 EXT4_SB(sb)->s_journal = journal;
4691 ext4_clear_journal_err(sb, es);
4692
4693 if (!really_read_only && journal_devnum &&
4694 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4695 es->s_journal_dev = cpu_to_le32(journal_devnum);
4696
4697 /* Make sure we flush the recovery flag to disk. */
4698 ext4_commit_super(sb, 1);
4699 }
4700
4701 return 0;
4702}
4703
4704static int ext4_commit_super(struct super_block *sb, int sync)
4705{
4706 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4707 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4708 int error = 0;
4709
4710 if (!sbh || block_device_ejected(sb))
4711 return error;
4712 /*
4713 * If the file system is mounted read-only, don't update the
4714 * superblock write time. This avoids updating the superblock
4715 * write time when we are mounting the root file system
4716 * read/only but we need to replay the journal; at that point,
4717 * for people who are east of GMT and who make their clock
4718 * tick in localtime for Windows bug-for-bug compatibility,
4719 * the clock is set in the future, and this will cause e2fsck
4720 * to complain and force a full file system check.
4721 */
4722 if (!(sb->s_flags & SB_RDONLY))
4723 es->s_wtime = cpu_to_le32(get_seconds());
4724 if (sb->s_bdev->bd_part)
4725 es->s_kbytes_written =
4726 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
4727 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4728 EXT4_SB(sb)->s_sectors_written_start) >> 1));
4729 else
4730 es->s_kbytes_written =
4731 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4732 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4733 ext4_free_blocks_count_set(es,
4734 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4735 &EXT4_SB(sb)->s_freeclusters_counter)));
4736 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4737 es->s_free_inodes_count =
4738 cpu_to_le32(percpu_counter_sum_positive(
4739 &EXT4_SB(sb)->s_freeinodes_counter));
4740 BUFFER_TRACE(sbh, "marking dirty");
4741 ext4_superblock_csum_set(sb);
4742 if (sync)
4743 lock_buffer(sbh);
4744 if (buffer_write_io_error(sbh)) {
4745 /*
4746 * Oh, dear. A previous attempt to write the
4747 * superblock failed. This could happen because the
4748 * USB device was yanked out. Or it could happen to
4749 * be a transient write error and maybe the block will
4750 * be remapped. Nothing we can do but to retry the
4751 * write and hope for the best.
4752 */
4753 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4754 "superblock detected");
4755 clear_buffer_write_io_error(sbh);
4756 set_buffer_uptodate(sbh);
4757 }
4758 mark_buffer_dirty(sbh);
4759 if (sync) {
4760 unlock_buffer(sbh);
4761 error = __sync_dirty_buffer(sbh,
4762 REQ_SYNC | (test_opt(sb, BARRIER) ? REQ_FUA : 0));
4763 if (error)
4764 return error;
4765
4766 error = buffer_write_io_error(sbh);
4767 if (error) {
4768 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4769 "superblock");
4770 clear_buffer_write_io_error(sbh);
4771 set_buffer_uptodate(sbh);
4772 }
4773 }
4774 return error;
4775}
4776
4777/*
4778 * Have we just finished recovery? If so, and if we are mounting (or
4779 * remounting) the filesystem readonly, then we will end up with a
4780 * consistent fs on disk. Record that fact.
4781 */
4782static void ext4_mark_recovery_complete(struct super_block *sb,
4783 struct ext4_super_block *es)
4784{
4785 journal_t *journal = EXT4_SB(sb)->s_journal;
4786
4787 if (!ext4_has_feature_journal(sb)) {
4788 BUG_ON(journal != NULL);
4789 return;
4790 }
4791 jbd2_journal_lock_updates(journal);
4792 if (jbd2_journal_flush(journal) < 0)
4793 goto out;
4794
4795 if (ext4_has_feature_journal_needs_recovery(sb) && sb_rdonly(sb)) {
4796 ext4_clear_feature_journal_needs_recovery(sb);
4797 ext4_commit_super(sb, 1);
4798 }
4799
4800out:
4801 jbd2_journal_unlock_updates(journal);
4802}
4803
4804/*
4805 * If we are mounting (or read-write remounting) a filesystem whose journal
4806 * has recorded an error from a previous lifetime, move that error to the
4807 * main filesystem now.
4808 */
4809static void ext4_clear_journal_err(struct super_block *sb,
4810 struct ext4_super_block *es)
4811{
4812 journal_t *journal;
4813 int j_errno;
4814 const char *errstr;
4815
4816 BUG_ON(!ext4_has_feature_journal(sb));
4817
4818 journal = EXT4_SB(sb)->s_journal;
4819
4820 /*
4821 * Now check for any error status which may have been recorded in the
4822 * journal by a prior ext4_error() or ext4_abort()
4823 */
4824
4825 j_errno = jbd2_journal_errno(journal);
4826 if (j_errno) {
4827 char nbuf[16];
4828
4829 errstr = ext4_decode_error(sb, j_errno, nbuf);
4830 ext4_warning(sb, "Filesystem error recorded "
4831 "from previous mount: %s", errstr);
4832 ext4_warning(sb, "Marking fs in need of filesystem check.");
4833
4834 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4835 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4836 ext4_commit_super(sb, 1);
4837
4838 jbd2_journal_clear_err(journal);
4839 jbd2_journal_update_sb_errno(journal);
4840 }
4841}
4842
4843/*
4844 * Force the running and committing transactions to commit,
4845 * and wait on the commit.
4846 */
4847int ext4_force_commit(struct super_block *sb)
4848{
4849 journal_t *journal;
4850
4851 if (sb_rdonly(sb))
4852 return 0;
4853
4854 journal = EXT4_SB(sb)->s_journal;
4855 return ext4_journal_force_commit(journal);
4856}
4857
4858static int ext4_sync_fs(struct super_block *sb, int wait)
4859{
4860 int ret = 0;
4861 tid_t target;
4862 bool needs_barrier = false;
4863 struct ext4_sb_info *sbi = EXT4_SB(sb);
4864
4865 if (unlikely(ext4_forced_shutdown(sbi)))
4866 return 0;
4867
4868 trace_ext4_sync_fs(sb, wait);
4869 flush_workqueue(sbi->rsv_conversion_wq);
4870 /*
4871 * Writeback quota in non-journalled quota case - journalled quota has
4872 * no dirty dquots
4873 */
4874 dquot_writeback_dquots(sb, -1);
4875 /*
4876 * Data writeback is possible w/o journal transaction, so barrier must
4877 * being sent at the end of the function. But we can skip it if
4878 * transaction_commit will do it for us.
4879 */
4880 if (sbi->s_journal) {
4881 target = jbd2_get_latest_transaction(sbi->s_journal);
4882 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4883 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4884 needs_barrier = true;
4885
4886 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4887 if (wait)
4888 ret = jbd2_log_wait_commit(sbi->s_journal,
4889 target);
4890 }
4891 } else if (wait && test_opt(sb, BARRIER))
4892 needs_barrier = true;
4893 if (needs_barrier) {
4894 int err;
4895 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4896 if (!ret)
4897 ret = err;
4898 }
4899
4900 return ret;
4901}
4902
4903/*
4904 * LVM calls this function before a (read-only) snapshot is created. This
4905 * gives us a chance to flush the journal completely and mark the fs clean.
4906 *
4907 * Note that only this function cannot bring a filesystem to be in a clean
4908 * state independently. It relies on upper layer to stop all data & metadata
4909 * modifications.
4910 */
4911static int ext4_freeze(struct super_block *sb)
4912{
4913 int error = 0;
4914 journal_t *journal;
4915
4916 if (sb_rdonly(sb))
4917 return 0;
4918
4919 journal = EXT4_SB(sb)->s_journal;
4920
4921 if (journal) {
4922 /* Now we set up the journal barrier. */
4923 jbd2_journal_lock_updates(journal);
4924
4925 /*
4926 * Don't clear the needs_recovery flag if we failed to
4927 * flush the journal.
4928 */
4929 error = jbd2_journal_flush(journal);
4930 if (error < 0)
4931 goto out;
4932
4933 /* Journal blocked and flushed, clear needs_recovery flag. */
4934 ext4_clear_feature_journal_needs_recovery(sb);
4935 }
4936
4937 error = ext4_commit_super(sb, 1);
4938out:
4939 if (journal)
4940 /* we rely on upper layer to stop further updates */
4941 jbd2_journal_unlock_updates(journal);
4942 return error;
4943}
4944
4945/*
4946 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4947 * flag here, even though the filesystem is not technically dirty yet.
4948 */
4949static int ext4_unfreeze(struct super_block *sb)
4950{
4951 if (sb_rdonly(sb) || ext4_forced_shutdown(EXT4_SB(sb)))
4952 return 0;
4953
4954 if (EXT4_SB(sb)->s_journal) {
4955 /* Reset the needs_recovery flag before the fs is unlocked. */
4956 ext4_set_feature_journal_needs_recovery(sb);
4957 }
4958
4959 ext4_commit_super(sb, 1);
4960 return 0;
4961}
4962
4963/*
4964 * Structure to save mount options for ext4_remount's benefit
4965 */
4966struct ext4_mount_options {
4967 unsigned long s_mount_opt;
4968 unsigned long s_mount_opt2;
4969 kuid_t s_resuid;
4970 kgid_t s_resgid;
4971 unsigned long s_commit_interval;
4972 u32 s_min_batch_time, s_max_batch_time;
4973#ifdef CONFIG_QUOTA
4974 int s_jquota_fmt;
4975 char *s_qf_names[EXT4_MAXQUOTAS];
4976#endif
4977};
4978
4979static int ext4_remount(struct super_block *sb, int *flags, char *data)
4980{
4981 struct ext4_super_block *es;
4982 struct ext4_sb_info *sbi = EXT4_SB(sb);
4983 unsigned long old_sb_flags;
4984 struct ext4_mount_options old_opts;
4985 int enable_quota = 0;
4986 ext4_group_t g;
4987 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4988 int err = 0;
4989#ifdef CONFIG_QUOTA
4990 int i, j;
4991#endif
4992 char *orig_data = kstrdup(data, GFP_KERNEL);
4993
4994 /* Store the original options */
4995 old_sb_flags = sb->s_flags;
4996 old_opts.s_mount_opt = sbi->s_mount_opt;
4997 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4998 old_opts.s_resuid = sbi->s_resuid;
4999 old_opts.s_resgid = sbi->s_resgid;
5000 old_opts.s_commit_interval = sbi->s_commit_interval;
5001 old_opts.s_min_batch_time = sbi->s_min_batch_time;
5002 old_opts.s_max_batch_time = sbi->s_max_batch_time;
5003#ifdef CONFIG_QUOTA
5004 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
5005 for (i = 0; i < EXT4_MAXQUOTAS; i++)
5006 if (sbi->s_qf_names[i]) {
5007 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
5008 GFP_KERNEL);
5009 if (!old_opts.s_qf_names[i]) {
5010 for (j = 0; j < i; j++)
5011 kfree(old_opts.s_qf_names[j]);
5012 kfree(orig_data);
5013 return -ENOMEM;
5014 }
5015 } else
5016 old_opts.s_qf_names[i] = NULL;
5017#endif
5018 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
5019 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
5020
5021 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
5022 err = -EINVAL;
5023 goto restore_opts;
5024 }
5025
5026 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
5027 test_opt(sb, JOURNAL_CHECKSUM)) {
5028 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
5029 "during remount not supported; ignoring");
5030 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
5031 }
5032
5033 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
5034 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
5035 ext4_msg(sb, KERN_ERR, "can't mount with "
5036 "both data=journal and delalloc");
5037 err = -EINVAL;
5038 goto restore_opts;
5039 }
5040 if (test_opt(sb, DIOREAD_NOLOCK)) {
5041 ext4_msg(sb, KERN_ERR, "can't mount with "
5042 "both data=journal and dioread_nolock");
5043 err = -EINVAL;
5044 goto restore_opts;
5045 }
5046 if (test_opt(sb, DAX)) {
5047 ext4_msg(sb, KERN_ERR, "can't mount with "
5048 "both data=journal and dax");
5049 err = -EINVAL;
5050 goto restore_opts;
5051 }
5052 } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
5053 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
5054 ext4_msg(sb, KERN_ERR, "can't mount with "
5055 "journal_async_commit in data=ordered mode");
5056 err = -EINVAL;
5057 goto restore_opts;
5058 }
5059 }
5060
5061 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
5062 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
5063 err = -EINVAL;
5064 goto restore_opts;
5065 }
5066
5067 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
5068 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
5069 "dax flag with busy inodes while remounting");
5070 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
5071 }
5072
5073 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
5074 ext4_abort(sb, "Abort forced by user");
5075
5076 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
5077 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
5078
5079 es = sbi->s_es;
5080
5081 if (sbi->s_journal) {
5082 ext4_init_journal_params(sb, sbi->s_journal);
5083 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
5084 }
5085
5086 if (*flags & SB_LAZYTIME)
5087 sb->s_flags |= SB_LAZYTIME;
5088
5089 if ((bool)(*flags & SB_RDONLY) != sb_rdonly(sb)) {
5090 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
5091 err = -EROFS;
5092 goto restore_opts;
5093 }
5094
5095 if (*flags & SB_RDONLY) {
5096 err = sync_filesystem(sb);
5097 if (err < 0)
5098 goto restore_opts;
5099 err = dquot_suspend(sb, -1);
5100 if (err < 0)
5101 goto restore_opts;
5102
5103 /*
5104 * First of all, the unconditional stuff we have to do
5105 * to disable replay of the journal when we next remount
5106 */
5107 sb->s_flags |= SB_RDONLY;
5108
5109 /*
5110 * OK, test if we are remounting a valid rw partition
5111 * readonly, and if so set the rdonly flag and then
5112 * mark the partition as valid again.
5113 */
5114 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
5115 (sbi->s_mount_state & EXT4_VALID_FS))
5116 es->s_state = cpu_to_le16(sbi->s_mount_state);
5117
5118 if (sbi->s_journal)
5119 ext4_mark_recovery_complete(sb, es);
5120 } else {
5121 /* Make sure we can mount this feature set readwrite */
5122 if (ext4_has_feature_readonly(sb) ||
5123 !ext4_feature_set_ok(sb, 0)) {
5124 err = -EROFS;
5125 goto restore_opts;
5126 }
5127 /*
5128 * Make sure the group descriptor checksums
5129 * are sane. If they aren't, refuse to remount r/w.
5130 */
5131 for (g = 0; g < sbi->s_groups_count; g++) {
5132 struct ext4_group_desc *gdp =
5133 ext4_get_group_desc(sb, g, NULL);
5134
5135 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
5136 ext4_msg(sb, KERN_ERR,
5137 "ext4_remount: Checksum for group %u failed (%u!=%u)",
5138 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
5139 le16_to_cpu(gdp->bg_checksum));
5140 err = -EFSBADCRC;
5141 goto restore_opts;
5142 }
5143 }
5144
5145 /*
5146 * If we have an unprocessed orphan list hanging
5147 * around from a previously readonly bdev mount,
5148 * require a full umount/remount for now.
5149 */
5150 if (es->s_last_orphan) {
5151 ext4_msg(sb, KERN_WARNING, "Couldn't "
5152 "remount RDWR because of unprocessed "
5153 "orphan inode list. Please "
5154 "umount/remount instead");
5155 err = -EINVAL;
5156 goto restore_opts;
5157 }
5158
5159 /*
5160 * Mounting a RDONLY partition read-write, so reread
5161 * and store the current valid flag. (It may have
5162 * been changed by e2fsck since we originally mounted
5163 * the partition.)
5164 */
5165 if (sbi->s_journal)
5166 ext4_clear_journal_err(sb, es);
5167 sbi->s_mount_state = le16_to_cpu(es->s_state);
5168 if (!ext4_setup_super(sb, es, 0))
5169 sb->s_flags &= ~SB_RDONLY;
5170 if (ext4_has_feature_mmp(sb))
5171 if (ext4_multi_mount_protect(sb,
5172 le64_to_cpu(es->s_mmp_block))) {
5173 err = -EROFS;
5174 goto restore_opts;
5175 }
5176 enable_quota = 1;
5177 }
5178 }
5179
5180 /*
5181 * Reinitialize lazy itable initialization thread based on
5182 * current settings
5183 */
5184 if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
5185 ext4_unregister_li_request(sb);
5186 else {
5187 ext4_group_t first_not_zeroed;
5188 first_not_zeroed = ext4_has_uninit_itable(sb);
5189 ext4_register_li_request(sb, first_not_zeroed);
5190 }
5191
5192 ext4_setup_system_zone(sb);
5193 if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY))
5194 ext4_commit_super(sb, 1);
5195
5196#ifdef CONFIG_QUOTA
5197 /* Release old quota file names */
5198 for (i = 0; i < EXT4_MAXQUOTAS; i++)
5199 kfree(old_opts.s_qf_names[i]);
5200 if (enable_quota) {
5201 if (sb_any_quota_suspended(sb))
5202 dquot_resume(sb, -1);
5203 else if (ext4_has_feature_quota(sb)) {
5204 err = ext4_enable_quotas(sb);
5205 if (err)
5206 goto restore_opts;
5207 }
5208 }
5209#endif
5210
5211 *flags = (*flags & ~SB_LAZYTIME) | (sb->s_flags & SB_LAZYTIME);
5212 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5213 kfree(orig_data);
5214 return 0;
5215
5216restore_opts:
5217 sb->s_flags = old_sb_flags;
5218 sbi->s_mount_opt = old_opts.s_mount_opt;
5219 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
5220 sbi->s_resuid = old_opts.s_resuid;
5221 sbi->s_resgid = old_opts.s_resgid;
5222 sbi->s_commit_interval = old_opts.s_commit_interval;
5223 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5224 sbi->s_max_batch_time = old_opts.s_max_batch_time;
5225#ifdef CONFIG_QUOTA
5226 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
5227 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
5228 kfree(sbi->s_qf_names[i]);
5229 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
5230 }
5231#endif
5232 kfree(orig_data);
5233 return err;
5234}
5235
5236#ifdef CONFIG_QUOTA
5237static int ext4_statfs_project(struct super_block *sb,
5238 kprojid_t projid, struct kstatfs *buf)
5239{
5240 struct kqid qid;
5241 struct dquot *dquot;
5242 u64 limit;
5243 u64 curblock;
5244
5245 qid = make_kqid_projid(projid);
5246 dquot = dqget(sb, qid);
5247 if (IS_ERR(dquot))
5248 return PTR_ERR(dquot);
5249 spin_lock(&dquot->dq_dqb_lock);
5250
5251 limit = (dquot->dq_dqb.dqb_bsoftlimit ?
5252 dquot->dq_dqb.dqb_bsoftlimit :
5253 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
5254 if (limit && buf->f_blocks > limit) {
5255 curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits;
5256 buf->f_blocks = limit;
5257 buf->f_bfree = buf->f_bavail =
5258 (buf->f_blocks > curblock) ?
5259 (buf->f_blocks - curblock) : 0;
5260 }
5261
5262 limit = dquot->dq_dqb.dqb_isoftlimit ?
5263 dquot->dq_dqb.dqb_isoftlimit :
5264 dquot->dq_dqb.dqb_ihardlimit;
5265 if (limit && buf->f_files > limit) {
5266 buf->f_files = limit;
5267 buf->f_ffree =
5268 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
5269 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
5270 }
5271
5272 spin_unlock(&dquot->dq_dqb_lock);
5273 dqput(dquot);
5274 return 0;
5275}
5276#endif
5277
5278static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
5279{
5280 struct super_block *sb = dentry->d_sb;
5281 struct ext4_sb_info *sbi = EXT4_SB(sb);
5282 struct ext4_super_block *es = sbi->s_es;
5283 ext4_fsblk_t overhead = 0, resv_blocks;
5284 u64 fsid;
5285 s64 bfree;
5286 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
5287
5288 if (!test_opt(sb, MINIX_DF))
5289 overhead = sbi->s_overhead;
5290
5291 buf->f_type = EXT4_SUPER_MAGIC;
5292 buf->f_bsize = sb->s_blocksize;
5293 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
5294 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5295 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
5296 /* prevent underflow in case that few free space is available */
5297 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
5298 buf->f_bavail = buf->f_bfree -
5299 (ext4_r_blocks_count(es) + resv_blocks);
5300 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
5301 buf->f_bavail = 0;
5302 buf->f_files = le32_to_cpu(es->s_inodes_count);
5303 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5304 buf->f_namelen = EXT4_NAME_LEN;
5305 fsid = le64_to_cpup((void *)es->s_uuid) ^
5306 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5307 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5308 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
5309
5310#ifdef CONFIG_QUOTA
5311 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
5312 sb_has_quota_limits_enabled(sb, PRJQUOTA))
5313 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
5314#endif
5315 return 0;
5316}
5317
5318
5319#ifdef CONFIG_QUOTA
5320
5321/*
5322 * Helper functions so that transaction is started before we acquire dqio_sem
5323 * to keep correct lock ordering of transaction > dqio_sem
5324 */
5325static inline struct inode *dquot_to_inode(struct dquot *dquot)
5326{
5327 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
5328}
5329
5330static int ext4_write_dquot(struct dquot *dquot)
5331{
5332 int ret, err;
5333 handle_t *handle;
5334 struct inode *inode;
5335
5336 inode = dquot_to_inode(dquot);
5337 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
5338 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
5339 if (IS_ERR(handle))
5340 return PTR_ERR(handle);
5341 ret = dquot_commit(dquot);
5342 err = ext4_journal_stop(handle);
5343 if (!ret)
5344 ret = err;
5345 return ret;
5346}
5347
5348static int ext4_acquire_dquot(struct dquot *dquot)
5349{
5350 int ret, err;
5351 handle_t *handle;
5352
5353 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5354 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
5355 if (IS_ERR(handle))
5356 return PTR_ERR(handle);
5357 ret = dquot_acquire(dquot);
5358 err = ext4_journal_stop(handle);
5359 if (!ret)
5360 ret = err;
5361 return ret;
5362}
5363
5364static int ext4_release_dquot(struct dquot *dquot)
5365{
5366 int ret, err;
5367 handle_t *handle;
5368
5369 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5370 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
5371 if (IS_ERR(handle)) {
5372 /* Release dquot anyway to avoid endless cycle in dqput() */
5373 dquot_release(dquot);
5374 return PTR_ERR(handle);
5375 }
5376 ret = dquot_release(dquot);
5377 err = ext4_journal_stop(handle);
5378 if (!ret)
5379 ret = err;
5380 return ret;
5381}
5382
5383static int ext4_mark_dquot_dirty(struct dquot *dquot)
5384{
5385 struct super_block *sb = dquot->dq_sb;
5386 struct ext4_sb_info *sbi = EXT4_SB(sb);
5387
5388 /* Are we journaling quotas? */
5389 if (ext4_has_feature_quota(sb) ||
5390 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
5391 dquot_mark_dquot_dirty(dquot);
5392 return ext4_write_dquot(dquot);
5393 } else {
5394 return dquot_mark_dquot_dirty(dquot);
5395 }
5396}
5397
5398static int ext4_write_info(struct super_block *sb, int type)
5399{
5400 int ret, err;
5401 handle_t *handle;
5402
5403 /* Data block + inode block */
5404 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
5405 if (IS_ERR(handle))
5406 return PTR_ERR(handle);
5407 ret = dquot_commit_info(sb, type);
5408 err = ext4_journal_stop(handle);
5409 if (!ret)
5410 ret = err;
5411 return ret;
5412}
5413
5414/*
5415 * Turn on quotas during mount time - we need to find
5416 * the quota file and such...
5417 */
5418static int ext4_quota_on_mount(struct super_block *sb, int type)
5419{
5420 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5421 EXT4_SB(sb)->s_jquota_fmt, type);
5422}
5423
5424static void lockdep_set_quota_inode(struct inode *inode, int subclass)
5425{
5426 struct ext4_inode_info *ei = EXT4_I(inode);
5427
5428 /* The first argument of lockdep_set_subclass has to be
5429 * *exactly* the same as the argument to init_rwsem() --- in
5430 * this case, in init_once() --- or lockdep gets unhappy
5431 * because the name of the lock is set using the
5432 * stringification of the argument to init_rwsem().
5433 */
5434 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
5435 lockdep_set_subclass(&ei->i_data_sem, subclass);
5436}
5437
5438/*
5439 * Standard function to be called on quota_on
5440 */
5441static int ext4_quota_on(struct super_block *sb, int type, int format_id,
5442 const struct path *path)
5443{
5444 int err;
5445
5446 if (!test_opt(sb, QUOTA))
5447 return -EINVAL;
5448
5449 /* Quotafile not on the same filesystem? */
5450 if (path->dentry->d_sb != sb)
5451 return -EXDEV;
5452 /* Journaling quota? */
5453 if (EXT4_SB(sb)->s_qf_names[type]) {
5454 /* Quotafile not in fs root? */
5455 if (path->dentry->d_parent != sb->s_root)
5456 ext4_msg(sb, KERN_WARNING,
5457 "Quota file not on filesystem root. "
5458 "Journaled quota will not work");
5459 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
5460 } else {
5461 /*
5462 * Clear the flag just in case mount options changed since
5463 * last time.
5464 */
5465 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
5466 }
5467
5468 /*
5469 * When we journal data on quota file, we have to flush journal to see
5470 * all updates to the file when we bypass pagecache...
5471 */
5472 if (EXT4_SB(sb)->s_journal &&
5473 ext4_should_journal_data(d_inode(path->dentry))) {
5474 /*
5475 * We don't need to lock updates but journal_flush() could
5476 * otherwise be livelocked...
5477 */
5478 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
5479 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
5480 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
5481 if (err)
5482 return err;
5483 }
5484
5485 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
5486 err = dquot_quota_on(sb, type, format_id, path);
5487 if (err) {
5488 lockdep_set_quota_inode(path->dentry->d_inode,
5489 I_DATA_SEM_NORMAL);
5490 } else {
5491 struct inode *inode = d_inode(path->dentry);
5492 handle_t *handle;
5493
5494 /*
5495 * Set inode flags to prevent userspace from messing with quota
5496 * files. If this fails, we return success anyway since quotas
5497 * are already enabled and this is not a hard failure.
5498 */
5499 inode_lock(inode);
5500 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5501 if (IS_ERR(handle))
5502 goto unlock_inode;
5503 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
5504 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
5505 S_NOATIME | S_IMMUTABLE);
5506 ext4_mark_inode_dirty(handle, inode);
5507 ext4_journal_stop(handle);
5508 unlock_inode:
5509 inode_unlock(inode);
5510 }
5511 return err;
5512}
5513
5514static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5515 unsigned int flags)
5516{
5517 int err;
5518 struct inode *qf_inode;
5519 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5520 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5521 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5522 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
5523 };
5524
5525 BUG_ON(!ext4_has_feature_quota(sb));
5526
5527 if (!qf_inums[type])
5528 return -EPERM;
5529
5530 qf_inode = ext4_iget(sb, qf_inums[type]);
5531 if (IS_ERR(qf_inode)) {
5532 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5533 return PTR_ERR(qf_inode);
5534 }
5535
5536 /* Don't account quota for quota files to avoid recursion */
5537 qf_inode->i_flags |= S_NOQUOTA;
5538 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
5539 err = dquot_enable(qf_inode, type, format_id, flags);
5540 iput(qf_inode);
5541 if (err)
5542 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
5543
5544 return err;
5545}
5546
5547/* Enable usage tracking for all quota types. */
5548static int ext4_enable_quotas(struct super_block *sb)
5549{
5550 int type, err = 0;
5551 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5552 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5553 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5554 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
5555 };
5556 bool quota_mopt[EXT4_MAXQUOTAS] = {
5557 test_opt(sb, USRQUOTA),
5558 test_opt(sb, GRPQUOTA),
5559 test_opt(sb, PRJQUOTA),
5560 };
5561
5562 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
5563 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
5564 if (qf_inums[type]) {
5565 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5566 DQUOT_USAGE_ENABLED |
5567 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
5568 if (err) {
5569 for (type--; type >= 0; type--)
5570 dquot_quota_off(sb, type);
5571
5572 ext4_warning(sb,
5573 "Failed to enable quota tracking "
5574 "(type=%d, err=%d). Please run "
5575 "e2fsck to fix.", type, err);
5576 return err;
5577 }
5578 }
5579 }
5580 return 0;
5581}
5582
5583static int ext4_quota_off(struct super_block *sb, int type)
5584{
5585 struct inode *inode = sb_dqopt(sb)->files[type];
5586 handle_t *handle;
5587 int err;
5588
5589 /* Force all delayed allocation blocks to be allocated.
5590 * Caller already holds s_umount sem */
5591 if (test_opt(sb, DELALLOC))
5592 sync_filesystem(sb);
5593
5594 if (!inode || !igrab(inode))
5595 goto out;
5596
5597 err = dquot_quota_off(sb, type);
5598 if (err || ext4_has_feature_quota(sb))
5599 goto out_put;
5600
5601 inode_lock(inode);
5602 /*
5603 * Update modification times of quota files when userspace can
5604 * start looking at them. If we fail, we return success anyway since
5605 * this is not a hard failure and quotas are already disabled.
5606 */
5607 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5608 if (IS_ERR(handle))
5609 goto out_unlock;
5610 EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
5611 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
5612 inode->i_mtime = inode->i_ctime = current_time(inode);
5613 ext4_mark_inode_dirty(handle, inode);
5614 ext4_journal_stop(handle);
5615out_unlock:
5616 inode_unlock(inode);
5617out_put:
5618 lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);
5619 iput(inode);
5620 return err;
5621out:
5622 return dquot_quota_off(sb, type);
5623}
5624
5625/* Read data from quotafile - avoid pagecache and such because we cannot afford
5626 * acquiring the locks... As quota files are never truncated and quota code
5627 * itself serializes the operations (and no one else should touch the files)
5628 * we don't have to be afraid of races */
5629static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5630 size_t len, loff_t off)
5631{
5632 struct inode *inode = sb_dqopt(sb)->files[type];
5633 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5634 int offset = off & (sb->s_blocksize - 1);
5635 int tocopy;
5636 size_t toread;
5637 struct buffer_head *bh;
5638 loff_t i_size = i_size_read(inode);
5639
5640 if (off > i_size)
5641 return 0;
5642 if (off+len > i_size)
5643 len = i_size-off;
5644 toread = len;
5645 while (toread > 0) {
5646 tocopy = sb->s_blocksize - offset < toread ?
5647 sb->s_blocksize - offset : toread;
5648 bh = ext4_bread(NULL, inode, blk, 0);
5649 if (IS_ERR(bh))
5650 return PTR_ERR(bh);
5651 if (!bh) /* A hole? */
5652 memset(data, 0, tocopy);
5653 else
5654 memcpy(data, bh->b_data+offset, tocopy);
5655 brelse(bh);
5656 offset = 0;
5657 toread -= tocopy;
5658 data += tocopy;
5659 blk++;
5660 }
5661 return len;
5662}
5663
5664/* Write to quotafile (we know the transaction is already started and has
5665 * enough credits) */
5666static ssize_t ext4_quota_write(struct super_block *sb, int type,
5667 const char *data, size_t len, loff_t off)
5668{
5669 struct inode *inode = sb_dqopt(sb)->files[type];
5670 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5671 int err, offset = off & (sb->s_blocksize - 1);
5672 int retries = 0;
5673 struct buffer_head *bh;
5674 handle_t *handle = journal_current_handle();
5675
5676 if (EXT4_SB(sb)->s_journal && !handle) {
5677 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5678 " cancelled because transaction is not started",
5679 (unsigned long long)off, (unsigned long long)len);
5680 return -EIO;
5681 }
5682 /*
5683 * Since we account only one data block in transaction credits,
5684 * then it is impossible to cross a block boundary.
5685 */
5686 if (sb->s_blocksize - offset < len) {
5687 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5688 " cancelled because not block aligned",
5689 (unsigned long long)off, (unsigned long long)len);
5690 return -EIO;
5691 }
5692
5693 do {
5694 bh = ext4_bread(handle, inode, blk,
5695 EXT4_GET_BLOCKS_CREATE |
5696 EXT4_GET_BLOCKS_METADATA_NOFAIL);
5697 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
5698 ext4_should_retry_alloc(inode->i_sb, &retries));
5699 if (IS_ERR(bh))
5700 return PTR_ERR(bh);
5701 if (!bh)
5702 goto out;
5703 BUFFER_TRACE(bh, "get write access");
5704 err = ext4_journal_get_write_access(handle, bh);
5705 if (err) {
5706 brelse(bh);
5707 return err;
5708 }
5709 lock_buffer(bh);
5710 memcpy(bh->b_data+offset, data, len);
5711 flush_dcache_page(bh->b_page);
5712 unlock_buffer(bh);
5713 err = ext4_handle_dirty_metadata(handle, NULL, bh);
5714 brelse(bh);
5715out:
5716 if (inode->i_size < off + len) {
5717 i_size_write(inode, off + len);
5718 EXT4_I(inode)->i_disksize = inode->i_size;
5719 ext4_mark_inode_dirty(handle, inode);
5720 }
5721 return len;
5722}
5723
5724static int ext4_get_next_id(struct super_block *sb, struct kqid *qid)
5725{
5726 const struct quota_format_ops *ops;
5727
5728 if (!sb_has_quota_loaded(sb, qid->type))
5729 return -ESRCH;
5730 ops = sb_dqopt(sb)->ops[qid->type];
5731 if (!ops || !ops->get_next_id)
5732 return -ENOSYS;
5733 return dquot_get_next_id(sb, qid);
5734}
5735#endif
5736
5737static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5738 const char *dev_name, void *data)
5739{
5740 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5741}
5742
5743#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
5744static inline void register_as_ext2(void)
5745{
5746 int err = register_filesystem(&ext2_fs_type);
5747 if (err)
5748 printk(KERN_WARNING
5749 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5750}
5751
5752static inline void unregister_as_ext2(void)
5753{
5754 unregister_filesystem(&ext2_fs_type);
5755}
5756
5757static inline int ext2_feature_set_ok(struct super_block *sb)
5758{
5759 if (ext4_has_unknown_ext2_incompat_features(sb))
5760 return 0;
5761 if (sb_rdonly(sb))
5762 return 1;
5763 if (ext4_has_unknown_ext2_ro_compat_features(sb))
5764 return 0;
5765 return 1;
5766}
5767#else
5768static inline void register_as_ext2(void) { }
5769static inline void unregister_as_ext2(void) { }
5770static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5771#endif
5772
5773static inline void register_as_ext3(void)
5774{
5775 int err = register_filesystem(&ext3_fs_type);
5776 if (err)
5777 printk(KERN_WARNING
5778 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5779}
5780
5781static inline void unregister_as_ext3(void)
5782{
5783 unregister_filesystem(&ext3_fs_type);
5784}
5785
5786static inline int ext3_feature_set_ok(struct super_block *sb)
5787{
5788 if (ext4_has_unknown_ext3_incompat_features(sb))
5789 return 0;
5790 if (!ext4_has_feature_journal(sb))
5791 return 0;
5792 if (sb_rdonly(sb))
5793 return 1;
5794 if (ext4_has_unknown_ext3_ro_compat_features(sb))
5795 return 0;
5796 return 1;
5797}
5798
5799static struct file_system_type ext4_fs_type = {
5800 .owner = THIS_MODULE,
5801 .name = "ext4",
5802 .mount = ext4_mount,
5803 .kill_sb = kill_block_super,
5804 .fs_flags = FS_REQUIRES_DEV,
5805};
5806MODULE_ALIAS_FS("ext4");
5807
5808/* Shared across all ext4 file systems */
5809wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5810
5811static int __init ext4_init_fs(void)
5812{
5813 int i, err;
5814
5815 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
5816 ext4_li_info = NULL;
5817 mutex_init(&ext4_li_mtx);
5818
5819 /* Build-time check for flags consistency */
5820 ext4_check_flag_values();
5821
5822 for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
5823 init_waitqueue_head(&ext4__ioend_wq[i]);
5824
5825 err = ext4_init_es();
5826 if (err)
5827 return err;
5828
5829 err = ext4_init_pageio();
5830 if (err)
5831 goto out5;
5832
5833 err = ext4_init_system_zone();
5834 if (err)
5835 goto out4;
5836
5837 err = ext4_init_sysfs();
5838 if (err)
5839 goto out3;
5840
5841 err = ext4_init_mballoc();
5842 if (err)
5843 goto out2;
5844 err = init_inodecache();
5845 if (err)
5846 goto out1;
5847 register_as_ext3();
5848 register_as_ext2();
5849 err = register_filesystem(&ext4_fs_type);
5850 if (err)
5851 goto out;
5852
5853 return 0;
5854out:
5855 unregister_as_ext2();
5856 unregister_as_ext3();
5857 destroy_inodecache();
5858out1:
5859 ext4_exit_mballoc();
5860out2:
5861 ext4_exit_sysfs();
5862out3:
5863 ext4_exit_system_zone();
5864out4:
5865 ext4_exit_pageio();
5866out5:
5867 ext4_exit_es();
5868
5869 return err;
5870}
5871
5872static void __exit ext4_exit_fs(void)
5873{
5874 ext4_destroy_lazyinit_thread();
5875 unregister_as_ext2();
5876 unregister_as_ext3();
5877 unregister_filesystem(&ext4_fs_type);
5878 destroy_inodecache();
5879 ext4_exit_mballoc();
5880 ext4_exit_sysfs();
5881 ext4_exit_system_zone();
5882 ext4_exit_pageio();
5883 ext4_exit_es();
5884}
5885
5886MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5887MODULE_DESCRIPTION("Fourth Extended Filesystem");
5888MODULE_LICENSE("GPL");
5889MODULE_SOFTDEP("pre: crc32c");
5890module_init(ext4_init_fs)
5891module_exit(ext4_exit_fs)
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/ext4/super.c
4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 *
10 * from
11 *
12 * linux/fs/minix/inode.c
13 *
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 *
16 * Big-endian to little-endian byte-swapping/bitmaps by
17 * David S. Miller (davem@caip.rutgers.edu), 1995
18 */
19
20#include <linux/module.h>
21#include <linux/string.h>
22#include <linux/fs.h>
23#include <linux/time.h>
24#include <linux/vmalloc.h>
25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
28#include <linux/backing-dev.h>
29#include <linux/parser.h>
30#include <linux/buffer_head.h>
31#include <linux/exportfs.h>
32#include <linux/vfs.h>
33#include <linux/random.h>
34#include <linux/mount.h>
35#include <linux/namei.h>
36#include <linux/quotaops.h>
37#include <linux/seq_file.h>
38#include <linux/ctype.h>
39#include <linux/log2.h>
40#include <linux/crc16.h>
41#include <linux/dax.h>
42#include <linux/uaccess.h>
43#include <linux/iversion.h>
44#include <linux/unicode.h>
45#include <linux/part_stat.h>
46#include <linux/kthread.h>
47#include <linux/freezer.h>
48#include <linux/fsnotify.h>
49#include <linux/fs_context.h>
50#include <linux/fs_parser.h>
51
52#include "ext4.h"
53#include "ext4_extents.h" /* Needed for trace points definition */
54#include "ext4_jbd2.h"
55#include "xattr.h"
56#include "acl.h"
57#include "mballoc.h"
58#include "fsmap.h"
59
60#define CREATE_TRACE_POINTS
61#include <trace/events/ext4.h>
62
63static struct ext4_lazy_init *ext4_li_info;
64static DEFINE_MUTEX(ext4_li_mtx);
65static struct ratelimit_state ext4_mount_msg_ratelimit;
66
67static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
68 unsigned long journal_devnum);
69static int ext4_show_options(struct seq_file *seq, struct dentry *root);
70static void ext4_update_super(struct super_block *sb);
71static int ext4_commit_super(struct super_block *sb);
72static int ext4_mark_recovery_complete(struct super_block *sb,
73 struct ext4_super_block *es);
74static int ext4_clear_journal_err(struct super_block *sb,
75 struct ext4_super_block *es);
76static int ext4_sync_fs(struct super_block *sb, int wait);
77static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
78static int ext4_unfreeze(struct super_block *sb);
79static int ext4_freeze(struct super_block *sb);
80static inline int ext2_feature_set_ok(struct super_block *sb);
81static inline int ext3_feature_set_ok(struct super_block *sb);
82static void ext4_destroy_lazyinit_thread(void);
83static void ext4_unregister_li_request(struct super_block *sb);
84static void ext4_clear_request_list(void);
85static struct inode *ext4_get_journal_inode(struct super_block *sb,
86 unsigned int journal_inum);
87static int ext4_validate_options(struct fs_context *fc);
88static int ext4_check_opt_consistency(struct fs_context *fc,
89 struct super_block *sb);
90static void ext4_apply_options(struct fs_context *fc, struct super_block *sb);
91static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param);
92static int ext4_get_tree(struct fs_context *fc);
93static int ext4_reconfigure(struct fs_context *fc);
94static void ext4_fc_free(struct fs_context *fc);
95static int ext4_init_fs_context(struct fs_context *fc);
96static void ext4_kill_sb(struct super_block *sb);
97static const struct fs_parameter_spec ext4_param_specs[];
98
99/*
100 * Lock ordering
101 *
102 * page fault path:
103 * mmap_lock -> sb_start_pagefault -> invalidate_lock (r) -> transaction start
104 * -> page lock -> i_data_sem (rw)
105 *
106 * buffered write path:
107 * sb_start_write -> i_mutex -> mmap_lock
108 * sb_start_write -> i_mutex -> transaction start -> page lock ->
109 * i_data_sem (rw)
110 *
111 * truncate:
112 * sb_start_write -> i_mutex -> invalidate_lock (w) -> i_mmap_rwsem (w) ->
113 * page lock
114 * sb_start_write -> i_mutex -> invalidate_lock (w) -> transaction start ->
115 * i_data_sem (rw)
116 *
117 * direct IO:
118 * sb_start_write -> i_mutex -> mmap_lock
119 * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw)
120 *
121 * writepages:
122 * transaction start -> page lock(s) -> i_data_sem (rw)
123 */
124
125static const struct fs_context_operations ext4_context_ops = {
126 .parse_param = ext4_parse_param,
127 .get_tree = ext4_get_tree,
128 .reconfigure = ext4_reconfigure,
129 .free = ext4_fc_free,
130};
131
132
133#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
134static struct file_system_type ext2_fs_type = {
135 .owner = THIS_MODULE,
136 .name = "ext2",
137 .init_fs_context = ext4_init_fs_context,
138 .parameters = ext4_param_specs,
139 .kill_sb = ext4_kill_sb,
140 .fs_flags = FS_REQUIRES_DEV,
141};
142MODULE_ALIAS_FS("ext2");
143MODULE_ALIAS("ext2");
144#define IS_EXT2_SB(sb) ((sb)->s_type == &ext2_fs_type)
145#else
146#define IS_EXT2_SB(sb) (0)
147#endif
148
149
150static struct file_system_type ext3_fs_type = {
151 .owner = THIS_MODULE,
152 .name = "ext3",
153 .init_fs_context = ext4_init_fs_context,
154 .parameters = ext4_param_specs,
155 .kill_sb = ext4_kill_sb,
156 .fs_flags = FS_REQUIRES_DEV,
157};
158MODULE_ALIAS_FS("ext3");
159MODULE_ALIAS("ext3");
160#define IS_EXT3_SB(sb) ((sb)->s_type == &ext3_fs_type)
161
162
163static inline void __ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags,
164 bh_end_io_t *end_io)
165{
166 /*
167 * buffer's verified bit is no longer valid after reading from
168 * disk again due to write out error, clear it to make sure we
169 * recheck the buffer contents.
170 */
171 clear_buffer_verified(bh);
172
173 bh->b_end_io = end_io ? end_io : end_buffer_read_sync;
174 get_bh(bh);
175 submit_bh(REQ_OP_READ | op_flags, bh);
176}
177
178void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags,
179 bh_end_io_t *end_io)
180{
181 BUG_ON(!buffer_locked(bh));
182
183 if (ext4_buffer_uptodate(bh)) {
184 unlock_buffer(bh);
185 return;
186 }
187 __ext4_read_bh(bh, op_flags, end_io);
188}
189
190int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags, bh_end_io_t *end_io)
191{
192 BUG_ON(!buffer_locked(bh));
193
194 if (ext4_buffer_uptodate(bh)) {
195 unlock_buffer(bh);
196 return 0;
197 }
198
199 __ext4_read_bh(bh, op_flags, end_io);
200
201 wait_on_buffer(bh);
202 if (buffer_uptodate(bh))
203 return 0;
204 return -EIO;
205}
206
207int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait)
208{
209 lock_buffer(bh);
210 if (!wait) {
211 ext4_read_bh_nowait(bh, op_flags, NULL);
212 return 0;
213 }
214 return ext4_read_bh(bh, op_flags, NULL);
215}
216
217/*
218 * This works like __bread_gfp() except it uses ERR_PTR for error
219 * returns. Currently with sb_bread it's impossible to distinguish
220 * between ENOMEM and EIO situations (since both result in a NULL
221 * return.
222 */
223static struct buffer_head *__ext4_sb_bread_gfp(struct super_block *sb,
224 sector_t block,
225 blk_opf_t op_flags, gfp_t gfp)
226{
227 struct buffer_head *bh;
228 int ret;
229
230 bh = sb_getblk_gfp(sb, block, gfp);
231 if (bh == NULL)
232 return ERR_PTR(-ENOMEM);
233 if (ext4_buffer_uptodate(bh))
234 return bh;
235
236 ret = ext4_read_bh_lock(bh, REQ_META | op_flags, true);
237 if (ret) {
238 put_bh(bh);
239 return ERR_PTR(ret);
240 }
241 return bh;
242}
243
244struct buffer_head *ext4_sb_bread(struct super_block *sb, sector_t block,
245 blk_opf_t op_flags)
246{
247 gfp_t gfp = mapping_gfp_constraint(sb->s_bdev->bd_inode->i_mapping,
248 ~__GFP_FS) | __GFP_MOVABLE;
249
250 return __ext4_sb_bread_gfp(sb, block, op_flags, gfp);
251}
252
253struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
254 sector_t block)
255{
256 gfp_t gfp = mapping_gfp_constraint(sb->s_bdev->bd_inode->i_mapping,
257 ~__GFP_FS);
258
259 return __ext4_sb_bread_gfp(sb, block, 0, gfp);
260}
261
262void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block)
263{
264 struct buffer_head *bh = bdev_getblk(sb->s_bdev, block,
265 sb->s_blocksize, GFP_NOWAIT | __GFP_NOWARN);
266
267 if (likely(bh)) {
268 if (trylock_buffer(bh))
269 ext4_read_bh_nowait(bh, REQ_RAHEAD, NULL);
270 brelse(bh);
271 }
272}
273
274static int ext4_verify_csum_type(struct super_block *sb,
275 struct ext4_super_block *es)
276{
277 if (!ext4_has_feature_metadata_csum(sb))
278 return 1;
279
280 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
281}
282
283__le32 ext4_superblock_csum(struct super_block *sb,
284 struct ext4_super_block *es)
285{
286 struct ext4_sb_info *sbi = EXT4_SB(sb);
287 int offset = offsetof(struct ext4_super_block, s_checksum);
288 __u32 csum;
289
290 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
291
292 return cpu_to_le32(csum);
293}
294
295static int ext4_superblock_csum_verify(struct super_block *sb,
296 struct ext4_super_block *es)
297{
298 if (!ext4_has_metadata_csum(sb))
299 return 1;
300
301 return es->s_checksum == ext4_superblock_csum(sb, es);
302}
303
304void ext4_superblock_csum_set(struct super_block *sb)
305{
306 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
307
308 if (!ext4_has_metadata_csum(sb))
309 return;
310
311 es->s_checksum = ext4_superblock_csum(sb, es);
312}
313
314ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
315 struct ext4_group_desc *bg)
316{
317 return le32_to_cpu(bg->bg_block_bitmap_lo) |
318 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
319 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
320}
321
322ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
323 struct ext4_group_desc *bg)
324{
325 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
326 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
327 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
328}
329
330ext4_fsblk_t ext4_inode_table(struct super_block *sb,
331 struct ext4_group_desc *bg)
332{
333 return le32_to_cpu(bg->bg_inode_table_lo) |
334 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
335 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
336}
337
338__u32 ext4_free_group_clusters(struct super_block *sb,
339 struct ext4_group_desc *bg)
340{
341 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
342 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
343 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
344}
345
346__u32 ext4_free_inodes_count(struct super_block *sb,
347 struct ext4_group_desc *bg)
348{
349 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
350 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
351 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
352}
353
354__u32 ext4_used_dirs_count(struct super_block *sb,
355 struct ext4_group_desc *bg)
356{
357 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
358 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
359 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
360}
361
362__u32 ext4_itable_unused_count(struct super_block *sb,
363 struct ext4_group_desc *bg)
364{
365 return le16_to_cpu(bg->bg_itable_unused_lo) |
366 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
367 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
368}
369
370void ext4_block_bitmap_set(struct super_block *sb,
371 struct ext4_group_desc *bg, ext4_fsblk_t blk)
372{
373 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
374 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
375 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
376}
377
378void ext4_inode_bitmap_set(struct super_block *sb,
379 struct ext4_group_desc *bg, ext4_fsblk_t blk)
380{
381 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
382 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
383 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
384}
385
386void ext4_inode_table_set(struct super_block *sb,
387 struct ext4_group_desc *bg, ext4_fsblk_t blk)
388{
389 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
390 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
391 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
392}
393
394void ext4_free_group_clusters_set(struct super_block *sb,
395 struct ext4_group_desc *bg, __u32 count)
396{
397 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
398 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
399 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
400}
401
402void ext4_free_inodes_set(struct super_block *sb,
403 struct ext4_group_desc *bg, __u32 count)
404{
405 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
406 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
407 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
408}
409
410void ext4_used_dirs_set(struct super_block *sb,
411 struct ext4_group_desc *bg, __u32 count)
412{
413 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
414 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
415 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
416}
417
418void ext4_itable_unused_set(struct super_block *sb,
419 struct ext4_group_desc *bg, __u32 count)
420{
421 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
422 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
423 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
424}
425
426static void __ext4_update_tstamp(__le32 *lo, __u8 *hi, time64_t now)
427{
428 now = clamp_val(now, 0, (1ull << 40) - 1);
429
430 *lo = cpu_to_le32(lower_32_bits(now));
431 *hi = upper_32_bits(now);
432}
433
434static time64_t __ext4_get_tstamp(__le32 *lo, __u8 *hi)
435{
436 return ((time64_t)(*hi) << 32) + le32_to_cpu(*lo);
437}
438#define ext4_update_tstamp(es, tstamp) \
439 __ext4_update_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi, \
440 ktime_get_real_seconds())
441#define ext4_get_tstamp(es, tstamp) \
442 __ext4_get_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
443
444#define EXT4_SB_REFRESH_INTERVAL_SEC (3600) /* seconds (1 hour) */
445#define EXT4_SB_REFRESH_INTERVAL_KB (16384) /* kilobytes (16MB) */
446
447/*
448 * The ext4_maybe_update_superblock() function checks and updates the
449 * superblock if needed.
450 *
451 * This function is designed to update the on-disk superblock only under
452 * certain conditions to prevent excessive disk writes and unnecessary
453 * waking of the disk from sleep. The superblock will be updated if:
454 * 1. More than an hour has passed since the last superblock update, and
455 * 2. More than 16MB have been written since the last superblock update.
456 *
457 * @sb: The superblock
458 */
459static void ext4_maybe_update_superblock(struct super_block *sb)
460{
461 struct ext4_sb_info *sbi = EXT4_SB(sb);
462 struct ext4_super_block *es = sbi->s_es;
463 journal_t *journal = sbi->s_journal;
464 time64_t now;
465 __u64 last_update;
466 __u64 lifetime_write_kbytes;
467 __u64 diff_size;
468
469 if (sb_rdonly(sb) || !(sb->s_flags & SB_ACTIVE) ||
470 !journal || (journal->j_flags & JBD2_UNMOUNT))
471 return;
472
473 now = ktime_get_real_seconds();
474 last_update = ext4_get_tstamp(es, s_wtime);
475
476 if (likely(now - last_update < EXT4_SB_REFRESH_INTERVAL_SEC))
477 return;
478
479 lifetime_write_kbytes = sbi->s_kbytes_written +
480 ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -
481 sbi->s_sectors_written_start) >> 1);
482
483 /* Get the number of kilobytes not written to disk to account
484 * for statistics and compare with a multiple of 16 MB. This
485 * is used to determine when the next superblock commit should
486 * occur (i.e. not more often than once per 16MB if there was
487 * less written in an hour).
488 */
489 diff_size = lifetime_write_kbytes - le64_to_cpu(es->s_kbytes_written);
490
491 if (diff_size > EXT4_SB_REFRESH_INTERVAL_KB)
492 schedule_work(&EXT4_SB(sb)->s_sb_upd_work);
493}
494
495/*
496 * The del_gendisk() function uninitializes the disk-specific data
497 * structures, including the bdi structure, without telling anyone
498 * else. Once this happens, any attempt to call mark_buffer_dirty()
499 * (for example, by ext4_commit_super), will cause a kernel OOPS.
500 * This is a kludge to prevent these oops until we can put in a proper
501 * hook in del_gendisk() to inform the VFS and file system layers.
502 */
503static int block_device_ejected(struct super_block *sb)
504{
505 struct inode *bd_inode = sb->s_bdev->bd_inode;
506 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
507
508 return bdi->dev == NULL;
509}
510
511static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
512{
513 struct super_block *sb = journal->j_private;
514 struct ext4_sb_info *sbi = EXT4_SB(sb);
515 int error = is_journal_aborted(journal);
516 struct ext4_journal_cb_entry *jce;
517
518 BUG_ON(txn->t_state == T_FINISHED);
519
520 ext4_process_freed_data(sb, txn->t_tid);
521 ext4_maybe_update_superblock(sb);
522
523 spin_lock(&sbi->s_md_lock);
524 while (!list_empty(&txn->t_private_list)) {
525 jce = list_entry(txn->t_private_list.next,
526 struct ext4_journal_cb_entry, jce_list);
527 list_del_init(&jce->jce_list);
528 spin_unlock(&sbi->s_md_lock);
529 jce->jce_func(sb, jce, error);
530 spin_lock(&sbi->s_md_lock);
531 }
532 spin_unlock(&sbi->s_md_lock);
533}
534
535/*
536 * This writepage callback for write_cache_pages()
537 * takes care of a few cases after page cleaning.
538 *
539 * write_cache_pages() already checks for dirty pages
540 * and calls clear_page_dirty_for_io(), which we want,
541 * to write protect the pages.
542 *
543 * However, we may have to redirty a page (see below.)
544 */
545static int ext4_journalled_writepage_callback(struct folio *folio,
546 struct writeback_control *wbc,
547 void *data)
548{
549 transaction_t *transaction = (transaction_t *) data;
550 struct buffer_head *bh, *head;
551 struct journal_head *jh;
552
553 bh = head = folio_buffers(folio);
554 do {
555 /*
556 * We have to redirty a page in these cases:
557 * 1) If buffer is dirty, it means the page was dirty because it
558 * contains a buffer that needs checkpointing. So the dirty bit
559 * needs to be preserved so that checkpointing writes the buffer
560 * properly.
561 * 2) If buffer is not part of the committing transaction
562 * (we may have just accidentally come across this buffer because
563 * inode range tracking is not exact) or if the currently running
564 * transaction already contains this buffer as well, dirty bit
565 * needs to be preserved so that the buffer gets writeprotected
566 * properly on running transaction's commit.
567 */
568 jh = bh2jh(bh);
569 if (buffer_dirty(bh) ||
570 (jh && (jh->b_transaction != transaction ||
571 jh->b_next_transaction))) {
572 folio_redirty_for_writepage(wbc, folio);
573 goto out;
574 }
575 } while ((bh = bh->b_this_page) != head);
576
577out:
578 return AOP_WRITEPAGE_ACTIVATE;
579}
580
581static int ext4_journalled_submit_inode_data_buffers(struct jbd2_inode *jinode)
582{
583 struct address_space *mapping = jinode->i_vfs_inode->i_mapping;
584 struct writeback_control wbc = {
585 .sync_mode = WB_SYNC_ALL,
586 .nr_to_write = LONG_MAX,
587 .range_start = jinode->i_dirty_start,
588 .range_end = jinode->i_dirty_end,
589 };
590
591 return write_cache_pages(mapping, &wbc,
592 ext4_journalled_writepage_callback,
593 jinode->i_transaction);
594}
595
596static int ext4_journal_submit_inode_data_buffers(struct jbd2_inode *jinode)
597{
598 int ret;
599
600 if (ext4_should_journal_data(jinode->i_vfs_inode))
601 ret = ext4_journalled_submit_inode_data_buffers(jinode);
602 else
603 ret = ext4_normal_submit_inode_data_buffers(jinode);
604 return ret;
605}
606
607static int ext4_journal_finish_inode_data_buffers(struct jbd2_inode *jinode)
608{
609 int ret = 0;
610
611 if (!ext4_should_journal_data(jinode->i_vfs_inode))
612 ret = jbd2_journal_finish_inode_data_buffers(jinode);
613
614 return ret;
615}
616
617static bool system_going_down(void)
618{
619 return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF
620 || system_state == SYSTEM_RESTART;
621}
622
623struct ext4_err_translation {
624 int code;
625 int errno;
626};
627
628#define EXT4_ERR_TRANSLATE(err) { .code = EXT4_ERR_##err, .errno = err }
629
630static struct ext4_err_translation err_translation[] = {
631 EXT4_ERR_TRANSLATE(EIO),
632 EXT4_ERR_TRANSLATE(ENOMEM),
633 EXT4_ERR_TRANSLATE(EFSBADCRC),
634 EXT4_ERR_TRANSLATE(EFSCORRUPTED),
635 EXT4_ERR_TRANSLATE(ENOSPC),
636 EXT4_ERR_TRANSLATE(ENOKEY),
637 EXT4_ERR_TRANSLATE(EROFS),
638 EXT4_ERR_TRANSLATE(EFBIG),
639 EXT4_ERR_TRANSLATE(EEXIST),
640 EXT4_ERR_TRANSLATE(ERANGE),
641 EXT4_ERR_TRANSLATE(EOVERFLOW),
642 EXT4_ERR_TRANSLATE(EBUSY),
643 EXT4_ERR_TRANSLATE(ENOTDIR),
644 EXT4_ERR_TRANSLATE(ENOTEMPTY),
645 EXT4_ERR_TRANSLATE(ESHUTDOWN),
646 EXT4_ERR_TRANSLATE(EFAULT),
647};
648
649static int ext4_errno_to_code(int errno)
650{
651 int i;
652
653 for (i = 0; i < ARRAY_SIZE(err_translation); i++)
654 if (err_translation[i].errno == errno)
655 return err_translation[i].code;
656 return EXT4_ERR_UNKNOWN;
657}
658
659static void save_error_info(struct super_block *sb, int error,
660 __u32 ino, __u64 block,
661 const char *func, unsigned int line)
662{
663 struct ext4_sb_info *sbi = EXT4_SB(sb);
664
665 /* We default to EFSCORRUPTED error... */
666 if (error == 0)
667 error = EFSCORRUPTED;
668
669 spin_lock(&sbi->s_error_lock);
670 sbi->s_add_error_count++;
671 sbi->s_last_error_code = error;
672 sbi->s_last_error_line = line;
673 sbi->s_last_error_ino = ino;
674 sbi->s_last_error_block = block;
675 sbi->s_last_error_func = func;
676 sbi->s_last_error_time = ktime_get_real_seconds();
677 if (!sbi->s_first_error_time) {
678 sbi->s_first_error_code = error;
679 sbi->s_first_error_line = line;
680 sbi->s_first_error_ino = ino;
681 sbi->s_first_error_block = block;
682 sbi->s_first_error_func = func;
683 sbi->s_first_error_time = sbi->s_last_error_time;
684 }
685 spin_unlock(&sbi->s_error_lock);
686}
687
688/* Deal with the reporting of failure conditions on a filesystem such as
689 * inconsistencies detected or read IO failures.
690 *
691 * On ext2, we can store the error state of the filesystem in the
692 * superblock. That is not possible on ext4, because we may have other
693 * write ordering constraints on the superblock which prevent us from
694 * writing it out straight away; and given that the journal is about to
695 * be aborted, we can't rely on the current, or future, transactions to
696 * write out the superblock safely.
697 *
698 * We'll just use the jbd2_journal_abort() error code to record an error in
699 * the journal instead. On recovery, the journal will complain about
700 * that error until we've noted it down and cleared it.
701 *
702 * If force_ro is set, we unconditionally force the filesystem into an
703 * ABORT|READONLY state, unless the error response on the fs has been set to
704 * panic in which case we take the easy way out and panic immediately. This is
705 * used to deal with unrecoverable failures such as journal IO errors or ENOMEM
706 * at a critical moment in log management.
707 */
708static void ext4_handle_error(struct super_block *sb, bool force_ro, int error,
709 __u32 ino, __u64 block,
710 const char *func, unsigned int line)
711{
712 journal_t *journal = EXT4_SB(sb)->s_journal;
713 bool continue_fs = !force_ro && test_opt(sb, ERRORS_CONT);
714
715 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
716 if (test_opt(sb, WARN_ON_ERROR))
717 WARN_ON_ONCE(1);
718
719 if (!continue_fs && !sb_rdonly(sb)) {
720 set_bit(EXT4_FLAGS_SHUTDOWN, &EXT4_SB(sb)->s_ext4_flags);
721 if (journal)
722 jbd2_journal_abort(journal, -EIO);
723 }
724
725 if (!bdev_read_only(sb->s_bdev)) {
726 save_error_info(sb, error, ino, block, func, line);
727 /*
728 * In case the fs should keep running, we need to writeout
729 * superblock through the journal. Due to lock ordering
730 * constraints, it may not be safe to do it right here so we
731 * defer superblock flushing to a workqueue.
732 */
733 if (continue_fs && journal)
734 schedule_work(&EXT4_SB(sb)->s_sb_upd_work);
735 else
736 ext4_commit_super(sb);
737 }
738
739 /*
740 * We force ERRORS_RO behavior when system is rebooting. Otherwise we
741 * could panic during 'reboot -f' as the underlying device got already
742 * disabled.
743 */
744 if (test_opt(sb, ERRORS_PANIC) && !system_going_down()) {
745 panic("EXT4-fs (device %s): panic forced after error\n",
746 sb->s_id);
747 }
748
749 if (sb_rdonly(sb) || continue_fs)
750 return;
751
752 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
753 /*
754 * Make sure updated value of ->s_mount_flags will be visible before
755 * ->s_flags update
756 */
757 smp_wmb();
758 sb->s_flags |= SB_RDONLY;
759}
760
761static void update_super_work(struct work_struct *work)
762{
763 struct ext4_sb_info *sbi = container_of(work, struct ext4_sb_info,
764 s_sb_upd_work);
765 journal_t *journal = sbi->s_journal;
766 handle_t *handle;
767
768 /*
769 * If the journal is still running, we have to write out superblock
770 * through the journal to avoid collisions of other journalled sb
771 * updates.
772 *
773 * We use directly jbd2 functions here to avoid recursing back into
774 * ext4 error handling code during handling of previous errors.
775 */
776 if (!sb_rdonly(sbi->s_sb) && journal) {
777 struct buffer_head *sbh = sbi->s_sbh;
778 bool call_notify_err = false;
779
780 handle = jbd2_journal_start(journal, 1);
781 if (IS_ERR(handle))
782 goto write_directly;
783 if (jbd2_journal_get_write_access(handle, sbh)) {
784 jbd2_journal_stop(handle);
785 goto write_directly;
786 }
787
788 if (sbi->s_add_error_count > 0)
789 call_notify_err = true;
790
791 ext4_update_super(sbi->s_sb);
792 if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
793 ext4_msg(sbi->s_sb, KERN_ERR, "previous I/O error to "
794 "superblock detected");
795 clear_buffer_write_io_error(sbh);
796 set_buffer_uptodate(sbh);
797 }
798
799 if (jbd2_journal_dirty_metadata(handle, sbh)) {
800 jbd2_journal_stop(handle);
801 goto write_directly;
802 }
803 jbd2_journal_stop(handle);
804
805 if (call_notify_err)
806 ext4_notify_error_sysfs(sbi);
807
808 return;
809 }
810write_directly:
811 /*
812 * Write through journal failed. Write sb directly to get error info
813 * out and hope for the best.
814 */
815 ext4_commit_super(sbi->s_sb);
816 ext4_notify_error_sysfs(sbi);
817}
818
819#define ext4_error_ratelimit(sb) \
820 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
821 "EXT4-fs error")
822
823void __ext4_error(struct super_block *sb, const char *function,
824 unsigned int line, bool force_ro, int error, __u64 block,
825 const char *fmt, ...)
826{
827 struct va_format vaf;
828 va_list args;
829
830 if (unlikely(ext4_forced_shutdown(sb)))
831 return;
832
833 trace_ext4_error(sb, function, line);
834 if (ext4_error_ratelimit(sb)) {
835 va_start(args, fmt);
836 vaf.fmt = fmt;
837 vaf.va = &args;
838 printk(KERN_CRIT
839 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
840 sb->s_id, function, line, current->comm, &vaf);
841 va_end(args);
842 }
843 fsnotify_sb_error(sb, NULL, error ? error : EFSCORRUPTED);
844
845 ext4_handle_error(sb, force_ro, error, 0, block, function, line);
846}
847
848void __ext4_error_inode(struct inode *inode, const char *function,
849 unsigned int line, ext4_fsblk_t block, int error,
850 const char *fmt, ...)
851{
852 va_list args;
853 struct va_format vaf;
854
855 if (unlikely(ext4_forced_shutdown(inode->i_sb)))
856 return;
857
858 trace_ext4_error(inode->i_sb, function, line);
859 if (ext4_error_ratelimit(inode->i_sb)) {
860 va_start(args, fmt);
861 vaf.fmt = fmt;
862 vaf.va = &args;
863 if (block)
864 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
865 "inode #%lu: block %llu: comm %s: %pV\n",
866 inode->i_sb->s_id, function, line, inode->i_ino,
867 block, current->comm, &vaf);
868 else
869 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
870 "inode #%lu: comm %s: %pV\n",
871 inode->i_sb->s_id, function, line, inode->i_ino,
872 current->comm, &vaf);
873 va_end(args);
874 }
875 fsnotify_sb_error(inode->i_sb, inode, error ? error : EFSCORRUPTED);
876
877 ext4_handle_error(inode->i_sb, false, error, inode->i_ino, block,
878 function, line);
879}
880
881void __ext4_error_file(struct file *file, const char *function,
882 unsigned int line, ext4_fsblk_t block,
883 const char *fmt, ...)
884{
885 va_list args;
886 struct va_format vaf;
887 struct inode *inode = file_inode(file);
888 char pathname[80], *path;
889
890 if (unlikely(ext4_forced_shutdown(inode->i_sb)))
891 return;
892
893 trace_ext4_error(inode->i_sb, function, line);
894 if (ext4_error_ratelimit(inode->i_sb)) {
895 path = file_path(file, pathname, sizeof(pathname));
896 if (IS_ERR(path))
897 path = "(unknown)";
898 va_start(args, fmt);
899 vaf.fmt = fmt;
900 vaf.va = &args;
901 if (block)
902 printk(KERN_CRIT
903 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
904 "block %llu: comm %s: path %s: %pV\n",
905 inode->i_sb->s_id, function, line, inode->i_ino,
906 block, current->comm, path, &vaf);
907 else
908 printk(KERN_CRIT
909 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
910 "comm %s: path %s: %pV\n",
911 inode->i_sb->s_id, function, line, inode->i_ino,
912 current->comm, path, &vaf);
913 va_end(args);
914 }
915 fsnotify_sb_error(inode->i_sb, inode, EFSCORRUPTED);
916
917 ext4_handle_error(inode->i_sb, false, EFSCORRUPTED, inode->i_ino, block,
918 function, line);
919}
920
921const char *ext4_decode_error(struct super_block *sb, int errno,
922 char nbuf[16])
923{
924 char *errstr = NULL;
925
926 switch (errno) {
927 case -EFSCORRUPTED:
928 errstr = "Corrupt filesystem";
929 break;
930 case -EFSBADCRC:
931 errstr = "Filesystem failed CRC";
932 break;
933 case -EIO:
934 errstr = "IO failure";
935 break;
936 case -ENOMEM:
937 errstr = "Out of memory";
938 break;
939 case -EROFS:
940 if (!sb || (EXT4_SB(sb)->s_journal &&
941 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
942 errstr = "Journal has aborted";
943 else
944 errstr = "Readonly filesystem";
945 break;
946 default:
947 /* If the caller passed in an extra buffer for unknown
948 * errors, textualise them now. Else we just return
949 * NULL. */
950 if (nbuf) {
951 /* Check for truncated error codes... */
952 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
953 errstr = nbuf;
954 }
955 break;
956 }
957
958 return errstr;
959}
960
961/* __ext4_std_error decodes expected errors from journaling functions
962 * automatically and invokes the appropriate error response. */
963
964void __ext4_std_error(struct super_block *sb, const char *function,
965 unsigned int line, int errno)
966{
967 char nbuf[16];
968 const char *errstr;
969
970 if (unlikely(ext4_forced_shutdown(sb)))
971 return;
972
973 /* Special case: if the error is EROFS, and we're not already
974 * inside a transaction, then there's really no point in logging
975 * an error. */
976 if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))
977 return;
978
979 if (ext4_error_ratelimit(sb)) {
980 errstr = ext4_decode_error(sb, errno, nbuf);
981 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
982 sb->s_id, function, line, errstr);
983 }
984 fsnotify_sb_error(sb, NULL, errno ? errno : EFSCORRUPTED);
985
986 ext4_handle_error(sb, false, -errno, 0, 0, function, line);
987}
988
989void __ext4_msg(struct super_block *sb,
990 const char *prefix, const char *fmt, ...)
991{
992 struct va_format vaf;
993 va_list args;
994
995 if (sb) {
996 atomic_inc(&EXT4_SB(sb)->s_msg_count);
997 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state),
998 "EXT4-fs"))
999 return;
1000 }
1001
1002 va_start(args, fmt);
1003 vaf.fmt = fmt;
1004 vaf.va = &args;
1005 if (sb)
1006 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
1007 else
1008 printk("%sEXT4-fs: %pV\n", prefix, &vaf);
1009 va_end(args);
1010}
1011
1012static int ext4_warning_ratelimit(struct super_block *sb)
1013{
1014 atomic_inc(&EXT4_SB(sb)->s_warning_count);
1015 return ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),
1016 "EXT4-fs warning");
1017}
1018
1019void __ext4_warning(struct super_block *sb, const char *function,
1020 unsigned int line, const char *fmt, ...)
1021{
1022 struct va_format vaf;
1023 va_list args;
1024
1025 if (!ext4_warning_ratelimit(sb))
1026 return;
1027
1028 va_start(args, fmt);
1029 vaf.fmt = fmt;
1030 vaf.va = &args;
1031 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
1032 sb->s_id, function, line, &vaf);
1033 va_end(args);
1034}
1035
1036void __ext4_warning_inode(const struct inode *inode, const char *function,
1037 unsigned int line, const char *fmt, ...)
1038{
1039 struct va_format vaf;
1040 va_list args;
1041
1042 if (!ext4_warning_ratelimit(inode->i_sb))
1043 return;
1044
1045 va_start(args, fmt);
1046 vaf.fmt = fmt;
1047 vaf.va = &args;
1048 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
1049 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
1050 function, line, inode->i_ino, current->comm, &vaf);
1051 va_end(args);
1052}
1053
1054void __ext4_grp_locked_error(const char *function, unsigned int line,
1055 struct super_block *sb, ext4_group_t grp,
1056 unsigned long ino, ext4_fsblk_t block,
1057 const char *fmt, ...)
1058__releases(bitlock)
1059__acquires(bitlock)
1060{
1061 struct va_format vaf;
1062 va_list args;
1063
1064 if (unlikely(ext4_forced_shutdown(sb)))
1065 return;
1066
1067 trace_ext4_error(sb, function, line);
1068 if (ext4_error_ratelimit(sb)) {
1069 va_start(args, fmt);
1070 vaf.fmt = fmt;
1071 vaf.va = &args;
1072 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
1073 sb->s_id, function, line, grp);
1074 if (ino)
1075 printk(KERN_CONT "inode %lu: ", ino);
1076 if (block)
1077 printk(KERN_CONT "block %llu:",
1078 (unsigned long long) block);
1079 printk(KERN_CONT "%pV\n", &vaf);
1080 va_end(args);
1081 }
1082
1083 if (test_opt(sb, ERRORS_CONT)) {
1084 if (test_opt(sb, WARN_ON_ERROR))
1085 WARN_ON_ONCE(1);
1086 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
1087 if (!bdev_read_only(sb->s_bdev)) {
1088 save_error_info(sb, EFSCORRUPTED, ino, block, function,
1089 line);
1090 schedule_work(&EXT4_SB(sb)->s_sb_upd_work);
1091 }
1092 return;
1093 }
1094 ext4_unlock_group(sb, grp);
1095 ext4_handle_error(sb, false, EFSCORRUPTED, ino, block, function, line);
1096 /*
1097 * We only get here in the ERRORS_RO case; relocking the group
1098 * may be dangerous, but nothing bad will happen since the
1099 * filesystem will have already been marked read/only and the
1100 * journal has been aborted. We return 1 as a hint to callers
1101 * who might what to use the return value from
1102 * ext4_grp_locked_error() to distinguish between the
1103 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
1104 * aggressively from the ext4 function in question, with a
1105 * more appropriate error code.
1106 */
1107 ext4_lock_group(sb, grp);
1108 return;
1109}
1110
1111void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
1112 ext4_group_t group,
1113 unsigned int flags)
1114{
1115 struct ext4_sb_info *sbi = EXT4_SB(sb);
1116 struct ext4_group_info *grp = ext4_get_group_info(sb, group);
1117 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL);
1118 int ret;
1119
1120 if (!grp || !gdp)
1121 return;
1122 if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) {
1123 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
1124 &grp->bb_state);
1125 if (!ret)
1126 percpu_counter_sub(&sbi->s_freeclusters_counter,
1127 grp->bb_free);
1128 }
1129
1130 if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) {
1131 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT,
1132 &grp->bb_state);
1133 if (!ret && gdp) {
1134 int count;
1135
1136 count = ext4_free_inodes_count(sb, gdp);
1137 percpu_counter_sub(&sbi->s_freeinodes_counter,
1138 count);
1139 }
1140 }
1141}
1142
1143void ext4_update_dynamic_rev(struct super_block *sb)
1144{
1145 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
1146
1147 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
1148 return;
1149
1150 ext4_warning(sb,
1151 "updating to rev %d because of new feature flag, "
1152 "running e2fsck is recommended",
1153 EXT4_DYNAMIC_REV);
1154
1155 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
1156 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
1157 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
1158 /* leave es->s_feature_*compat flags alone */
1159 /* es->s_uuid will be set by e2fsck if empty */
1160
1161 /*
1162 * The rest of the superblock fields should be zero, and if not it
1163 * means they are likely already in use, so leave them alone. We
1164 * can leave it up to e2fsck to clean up any inconsistencies there.
1165 */
1166}
1167
1168static inline struct inode *orphan_list_entry(struct list_head *l)
1169{
1170 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
1171}
1172
1173static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
1174{
1175 struct list_head *l;
1176
1177 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
1178 le32_to_cpu(sbi->s_es->s_last_orphan));
1179
1180 printk(KERN_ERR "sb_info orphan list:\n");
1181 list_for_each(l, &sbi->s_orphan) {
1182 struct inode *inode = orphan_list_entry(l);
1183 printk(KERN_ERR " "
1184 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
1185 inode->i_sb->s_id, inode->i_ino, inode,
1186 inode->i_mode, inode->i_nlink,
1187 NEXT_ORPHAN(inode));
1188 }
1189}
1190
1191#ifdef CONFIG_QUOTA
1192static int ext4_quota_off(struct super_block *sb, int type);
1193
1194static inline void ext4_quotas_off(struct super_block *sb, int type)
1195{
1196 BUG_ON(type > EXT4_MAXQUOTAS);
1197
1198 /* Use our quota_off function to clear inode flags etc. */
1199 for (type--; type >= 0; type--)
1200 ext4_quota_off(sb, type);
1201}
1202
1203/*
1204 * This is a helper function which is used in the mount/remount
1205 * codepaths (which holds s_umount) to fetch the quota file name.
1206 */
1207static inline char *get_qf_name(struct super_block *sb,
1208 struct ext4_sb_info *sbi,
1209 int type)
1210{
1211 return rcu_dereference_protected(sbi->s_qf_names[type],
1212 lockdep_is_held(&sb->s_umount));
1213}
1214#else
1215static inline void ext4_quotas_off(struct super_block *sb, int type)
1216{
1217}
1218#endif
1219
1220static int ext4_percpu_param_init(struct ext4_sb_info *sbi)
1221{
1222 ext4_fsblk_t block;
1223 int err;
1224
1225 block = ext4_count_free_clusters(sbi->s_sb);
1226 ext4_free_blocks_count_set(sbi->s_es, EXT4_C2B(sbi, block));
1227 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
1228 GFP_KERNEL);
1229 if (!err) {
1230 unsigned long freei = ext4_count_free_inodes(sbi->s_sb);
1231 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
1232 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
1233 GFP_KERNEL);
1234 }
1235 if (!err)
1236 err = percpu_counter_init(&sbi->s_dirs_counter,
1237 ext4_count_dirs(sbi->s_sb), GFP_KERNEL);
1238 if (!err)
1239 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
1240 GFP_KERNEL);
1241 if (!err)
1242 err = percpu_counter_init(&sbi->s_sra_exceeded_retry_limit, 0,
1243 GFP_KERNEL);
1244 if (!err)
1245 err = percpu_init_rwsem(&sbi->s_writepages_rwsem);
1246
1247 if (err)
1248 ext4_msg(sbi->s_sb, KERN_ERR, "insufficient memory");
1249
1250 return err;
1251}
1252
1253static void ext4_percpu_param_destroy(struct ext4_sb_info *sbi)
1254{
1255 percpu_counter_destroy(&sbi->s_freeclusters_counter);
1256 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1257 percpu_counter_destroy(&sbi->s_dirs_counter);
1258 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
1259 percpu_counter_destroy(&sbi->s_sra_exceeded_retry_limit);
1260 percpu_free_rwsem(&sbi->s_writepages_rwsem);
1261}
1262
1263static void ext4_group_desc_free(struct ext4_sb_info *sbi)
1264{
1265 struct buffer_head **group_desc;
1266 int i;
1267
1268 rcu_read_lock();
1269 group_desc = rcu_dereference(sbi->s_group_desc);
1270 for (i = 0; i < sbi->s_gdb_count; i++)
1271 brelse(group_desc[i]);
1272 kvfree(group_desc);
1273 rcu_read_unlock();
1274}
1275
1276static void ext4_flex_groups_free(struct ext4_sb_info *sbi)
1277{
1278 struct flex_groups **flex_groups;
1279 int i;
1280
1281 rcu_read_lock();
1282 flex_groups = rcu_dereference(sbi->s_flex_groups);
1283 if (flex_groups) {
1284 for (i = 0; i < sbi->s_flex_groups_allocated; i++)
1285 kvfree(flex_groups[i]);
1286 kvfree(flex_groups);
1287 }
1288 rcu_read_unlock();
1289}
1290
1291static void ext4_put_super(struct super_block *sb)
1292{
1293 struct ext4_sb_info *sbi = EXT4_SB(sb);
1294 struct ext4_super_block *es = sbi->s_es;
1295 int aborted = 0;
1296 int err;
1297
1298 /*
1299 * Unregister sysfs before destroying jbd2 journal.
1300 * Since we could still access attr_journal_task attribute via sysfs
1301 * path which could have sbi->s_journal->j_task as NULL
1302 * Unregister sysfs before flush sbi->s_sb_upd_work.
1303 * Since user may read /proc/fs/ext4/xx/mb_groups during umount, If
1304 * read metadata verify failed then will queue error work.
1305 * update_super_work will call start_this_handle may trigger
1306 * BUG_ON.
1307 */
1308 ext4_unregister_sysfs(sb);
1309
1310 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs unmount"))
1311 ext4_msg(sb, KERN_INFO, "unmounting filesystem %pU.",
1312 &sb->s_uuid);
1313
1314 ext4_unregister_li_request(sb);
1315 ext4_quotas_off(sb, EXT4_MAXQUOTAS);
1316
1317 flush_work(&sbi->s_sb_upd_work);
1318 destroy_workqueue(sbi->rsv_conversion_wq);
1319 ext4_release_orphan_info(sb);
1320
1321 if (sbi->s_journal) {
1322 aborted = is_journal_aborted(sbi->s_journal);
1323 err = jbd2_journal_destroy(sbi->s_journal);
1324 sbi->s_journal = NULL;
1325 if ((err < 0) && !aborted) {
1326 ext4_abort(sb, -err, "Couldn't clean up the journal");
1327 }
1328 }
1329
1330 ext4_es_unregister_shrinker(sbi);
1331 timer_shutdown_sync(&sbi->s_err_report);
1332 ext4_release_system_zone(sb);
1333 ext4_mb_release(sb);
1334 ext4_ext_release(sb);
1335
1336 if (!sb_rdonly(sb) && !aborted) {
1337 ext4_clear_feature_journal_needs_recovery(sb);
1338 ext4_clear_feature_orphan_present(sb);
1339 es->s_state = cpu_to_le16(sbi->s_mount_state);
1340 }
1341 if (!sb_rdonly(sb))
1342 ext4_commit_super(sb);
1343
1344 ext4_group_desc_free(sbi);
1345 ext4_flex_groups_free(sbi);
1346 ext4_percpu_param_destroy(sbi);
1347#ifdef CONFIG_QUOTA
1348 for (int i = 0; i < EXT4_MAXQUOTAS; i++)
1349 kfree(get_qf_name(sb, sbi, i));
1350#endif
1351
1352 /* Debugging code just in case the in-memory inode orphan list
1353 * isn't empty. The on-disk one can be non-empty if we've
1354 * detected an error and taken the fs readonly, but the
1355 * in-memory list had better be clean by this point. */
1356 if (!list_empty(&sbi->s_orphan))
1357 dump_orphan_list(sb, sbi);
1358 ASSERT(list_empty(&sbi->s_orphan));
1359
1360 sync_blockdev(sb->s_bdev);
1361 invalidate_bdev(sb->s_bdev);
1362 if (sbi->s_journal_bdev_file) {
1363 /*
1364 * Invalidate the journal device's buffers. We don't want them
1365 * floating about in memory - the physical journal device may
1366 * hotswapped, and it breaks the `ro-after' testing code.
1367 */
1368 sync_blockdev(file_bdev(sbi->s_journal_bdev_file));
1369 invalidate_bdev(file_bdev(sbi->s_journal_bdev_file));
1370 }
1371
1372 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
1373 sbi->s_ea_inode_cache = NULL;
1374
1375 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
1376 sbi->s_ea_block_cache = NULL;
1377
1378 ext4_stop_mmpd(sbi);
1379
1380 brelse(sbi->s_sbh);
1381 sb->s_fs_info = NULL;
1382 /*
1383 * Now that we are completely done shutting down the
1384 * superblock, we need to actually destroy the kobject.
1385 */
1386 kobject_put(&sbi->s_kobj);
1387 wait_for_completion(&sbi->s_kobj_unregister);
1388 if (sbi->s_chksum_driver)
1389 crypto_free_shash(sbi->s_chksum_driver);
1390 kfree(sbi->s_blockgroup_lock);
1391 fs_put_dax(sbi->s_daxdev, NULL);
1392 fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy);
1393#if IS_ENABLED(CONFIG_UNICODE)
1394 utf8_unload(sb->s_encoding);
1395#endif
1396 kfree(sbi);
1397}
1398
1399static struct kmem_cache *ext4_inode_cachep;
1400
1401/*
1402 * Called inside transaction, so use GFP_NOFS
1403 */
1404static struct inode *ext4_alloc_inode(struct super_block *sb)
1405{
1406 struct ext4_inode_info *ei;
1407
1408 ei = alloc_inode_sb(sb, ext4_inode_cachep, GFP_NOFS);
1409 if (!ei)
1410 return NULL;
1411
1412 inode_set_iversion(&ei->vfs_inode, 1);
1413 ei->i_flags = 0;
1414 spin_lock_init(&ei->i_raw_lock);
1415 ei->i_prealloc_node = RB_ROOT;
1416 atomic_set(&ei->i_prealloc_active, 0);
1417 rwlock_init(&ei->i_prealloc_lock);
1418 ext4_es_init_tree(&ei->i_es_tree);
1419 rwlock_init(&ei->i_es_lock);
1420 INIT_LIST_HEAD(&ei->i_es_list);
1421 ei->i_es_all_nr = 0;
1422 ei->i_es_shk_nr = 0;
1423 ei->i_es_shrink_lblk = 0;
1424 ei->i_reserved_data_blocks = 0;
1425 spin_lock_init(&(ei->i_block_reservation_lock));
1426 ext4_init_pending_tree(&ei->i_pending_tree);
1427#ifdef CONFIG_QUOTA
1428 ei->i_reserved_quota = 0;
1429 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
1430#endif
1431 ei->jinode = NULL;
1432 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
1433 spin_lock_init(&ei->i_completed_io_lock);
1434 ei->i_sync_tid = 0;
1435 ei->i_datasync_tid = 0;
1436 atomic_set(&ei->i_unwritten, 0);
1437 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
1438 ext4_fc_init_inode(&ei->vfs_inode);
1439 mutex_init(&ei->i_fc_lock);
1440 return &ei->vfs_inode;
1441}
1442
1443static int ext4_drop_inode(struct inode *inode)
1444{
1445 int drop = generic_drop_inode(inode);
1446
1447 if (!drop)
1448 drop = fscrypt_drop_inode(inode);
1449
1450 trace_ext4_drop_inode(inode, drop);
1451 return drop;
1452}
1453
1454static void ext4_free_in_core_inode(struct inode *inode)
1455{
1456 fscrypt_free_inode(inode);
1457 if (!list_empty(&(EXT4_I(inode)->i_fc_list))) {
1458 pr_warn("%s: inode %ld still in fc list",
1459 __func__, inode->i_ino);
1460 }
1461 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1462}
1463
1464static void ext4_destroy_inode(struct inode *inode)
1465{
1466 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
1467 ext4_msg(inode->i_sb, KERN_ERR,
1468 "Inode %lu (%p): orphan list check failed!",
1469 inode->i_ino, EXT4_I(inode));
1470 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1471 EXT4_I(inode), sizeof(struct ext4_inode_info),
1472 true);
1473 dump_stack();
1474 }
1475
1476 if (EXT4_I(inode)->i_reserved_data_blocks)
1477 ext4_msg(inode->i_sb, KERN_ERR,
1478 "Inode %lu (%p): i_reserved_data_blocks (%u) not cleared!",
1479 inode->i_ino, EXT4_I(inode),
1480 EXT4_I(inode)->i_reserved_data_blocks);
1481}
1482
1483static void ext4_shutdown(struct super_block *sb)
1484{
1485 ext4_force_shutdown(sb, EXT4_GOING_FLAGS_NOLOGFLUSH);
1486}
1487
1488static void init_once(void *foo)
1489{
1490 struct ext4_inode_info *ei = foo;
1491
1492 INIT_LIST_HEAD(&ei->i_orphan);
1493 init_rwsem(&ei->xattr_sem);
1494 init_rwsem(&ei->i_data_sem);
1495 inode_init_once(&ei->vfs_inode);
1496 ext4_fc_init_inode(&ei->vfs_inode);
1497}
1498
1499static int __init init_inodecache(void)
1500{
1501 ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",
1502 sizeof(struct ext4_inode_info), 0,
1503 SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT,
1504 offsetof(struct ext4_inode_info, i_data),
1505 sizeof_field(struct ext4_inode_info, i_data),
1506 init_once);
1507 if (ext4_inode_cachep == NULL)
1508 return -ENOMEM;
1509 return 0;
1510}
1511
1512static void destroy_inodecache(void)
1513{
1514 /*
1515 * Make sure all delayed rcu free inodes are flushed before we
1516 * destroy cache.
1517 */
1518 rcu_barrier();
1519 kmem_cache_destroy(ext4_inode_cachep);
1520}
1521
1522void ext4_clear_inode(struct inode *inode)
1523{
1524 ext4_fc_del(inode);
1525 invalidate_inode_buffers(inode);
1526 clear_inode(inode);
1527 ext4_discard_preallocations(inode);
1528 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1529 dquot_drop(inode);
1530 if (EXT4_I(inode)->jinode) {
1531 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1532 EXT4_I(inode)->jinode);
1533 jbd2_free_inode(EXT4_I(inode)->jinode);
1534 EXT4_I(inode)->jinode = NULL;
1535 }
1536 fscrypt_put_encryption_info(inode);
1537 fsverity_cleanup_inode(inode);
1538}
1539
1540static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1541 u64 ino, u32 generation)
1542{
1543 struct inode *inode;
1544
1545 /*
1546 * Currently we don't know the generation for parent directory, so
1547 * a generation of 0 means "accept any"
1548 */
1549 inode = ext4_iget(sb, ino, EXT4_IGET_HANDLE);
1550 if (IS_ERR(inode))
1551 return ERR_CAST(inode);
1552 if (generation && inode->i_generation != generation) {
1553 iput(inode);
1554 return ERR_PTR(-ESTALE);
1555 }
1556
1557 return inode;
1558}
1559
1560static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1561 int fh_len, int fh_type)
1562{
1563 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1564 ext4_nfs_get_inode);
1565}
1566
1567static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1568 int fh_len, int fh_type)
1569{
1570 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1571 ext4_nfs_get_inode);
1572}
1573
1574static int ext4_nfs_commit_metadata(struct inode *inode)
1575{
1576 struct writeback_control wbc = {
1577 .sync_mode = WB_SYNC_ALL
1578 };
1579
1580 trace_ext4_nfs_commit_metadata(inode);
1581 return ext4_write_inode(inode, &wbc);
1582}
1583
1584#ifdef CONFIG_QUOTA
1585static const char * const quotatypes[] = INITQFNAMES;
1586#define QTYPE2NAME(t) (quotatypes[t])
1587
1588static int ext4_write_dquot(struct dquot *dquot);
1589static int ext4_acquire_dquot(struct dquot *dquot);
1590static int ext4_release_dquot(struct dquot *dquot);
1591static int ext4_mark_dquot_dirty(struct dquot *dquot);
1592static int ext4_write_info(struct super_block *sb, int type);
1593static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1594 const struct path *path);
1595static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1596 size_t len, loff_t off);
1597static ssize_t ext4_quota_write(struct super_block *sb, int type,
1598 const char *data, size_t len, loff_t off);
1599static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1600 unsigned int flags);
1601
1602static struct dquot __rcu **ext4_get_dquots(struct inode *inode)
1603{
1604 return EXT4_I(inode)->i_dquot;
1605}
1606
1607static const struct dquot_operations ext4_quota_operations = {
1608 .get_reserved_space = ext4_get_reserved_space,
1609 .write_dquot = ext4_write_dquot,
1610 .acquire_dquot = ext4_acquire_dquot,
1611 .release_dquot = ext4_release_dquot,
1612 .mark_dirty = ext4_mark_dquot_dirty,
1613 .write_info = ext4_write_info,
1614 .alloc_dquot = dquot_alloc,
1615 .destroy_dquot = dquot_destroy,
1616 .get_projid = ext4_get_projid,
1617 .get_inode_usage = ext4_get_inode_usage,
1618 .get_next_id = dquot_get_next_id,
1619};
1620
1621static const struct quotactl_ops ext4_qctl_operations = {
1622 .quota_on = ext4_quota_on,
1623 .quota_off = ext4_quota_off,
1624 .quota_sync = dquot_quota_sync,
1625 .get_state = dquot_get_state,
1626 .set_info = dquot_set_dqinfo,
1627 .get_dqblk = dquot_get_dqblk,
1628 .set_dqblk = dquot_set_dqblk,
1629 .get_nextdqblk = dquot_get_next_dqblk,
1630};
1631#endif
1632
1633static const struct super_operations ext4_sops = {
1634 .alloc_inode = ext4_alloc_inode,
1635 .free_inode = ext4_free_in_core_inode,
1636 .destroy_inode = ext4_destroy_inode,
1637 .write_inode = ext4_write_inode,
1638 .dirty_inode = ext4_dirty_inode,
1639 .drop_inode = ext4_drop_inode,
1640 .evict_inode = ext4_evict_inode,
1641 .put_super = ext4_put_super,
1642 .sync_fs = ext4_sync_fs,
1643 .freeze_fs = ext4_freeze,
1644 .unfreeze_fs = ext4_unfreeze,
1645 .statfs = ext4_statfs,
1646 .show_options = ext4_show_options,
1647 .shutdown = ext4_shutdown,
1648#ifdef CONFIG_QUOTA
1649 .quota_read = ext4_quota_read,
1650 .quota_write = ext4_quota_write,
1651 .get_dquots = ext4_get_dquots,
1652#endif
1653};
1654
1655static const struct export_operations ext4_export_ops = {
1656 .encode_fh = generic_encode_ino32_fh,
1657 .fh_to_dentry = ext4_fh_to_dentry,
1658 .fh_to_parent = ext4_fh_to_parent,
1659 .get_parent = ext4_get_parent,
1660 .commit_metadata = ext4_nfs_commit_metadata,
1661};
1662
1663enum {
1664 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1665 Opt_resgid, Opt_resuid, Opt_sb,
1666 Opt_nouid32, Opt_debug, Opt_removed,
1667 Opt_user_xattr, Opt_acl,
1668 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1669 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1670 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1671 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1672 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
1673 Opt_inlinecrypt,
1674 Opt_usrjquota, Opt_grpjquota, Opt_quota,
1675 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1676 Opt_usrquota, Opt_grpquota, Opt_prjquota,
1677 Opt_dax, Opt_dax_always, Opt_dax_inode, Opt_dax_never,
1678 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error,
1679 Opt_nowarn_on_error, Opt_mblk_io_submit, Opt_debug_want_extra_isize,
1680 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1681 Opt_inode_readahead_blks, Opt_journal_ioprio,
1682 Opt_dioread_nolock, Opt_dioread_lock,
1683 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1684 Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
1685 Opt_no_prefetch_block_bitmaps, Opt_mb_optimize_scan,
1686 Opt_errors, Opt_data, Opt_data_err, Opt_jqfmt, Opt_dax_type,
1687#ifdef CONFIG_EXT4_DEBUG
1688 Opt_fc_debug_max_replay, Opt_fc_debug_force
1689#endif
1690};
1691
1692static const struct constant_table ext4_param_errors[] = {
1693 {"continue", EXT4_MOUNT_ERRORS_CONT},
1694 {"panic", EXT4_MOUNT_ERRORS_PANIC},
1695 {"remount-ro", EXT4_MOUNT_ERRORS_RO},
1696 {}
1697};
1698
1699static const struct constant_table ext4_param_data[] = {
1700 {"journal", EXT4_MOUNT_JOURNAL_DATA},
1701 {"ordered", EXT4_MOUNT_ORDERED_DATA},
1702 {"writeback", EXT4_MOUNT_WRITEBACK_DATA},
1703 {}
1704};
1705
1706static const struct constant_table ext4_param_data_err[] = {
1707 {"abort", Opt_data_err_abort},
1708 {"ignore", Opt_data_err_ignore},
1709 {}
1710};
1711
1712static const struct constant_table ext4_param_jqfmt[] = {
1713 {"vfsold", QFMT_VFS_OLD},
1714 {"vfsv0", QFMT_VFS_V0},
1715 {"vfsv1", QFMT_VFS_V1},
1716 {}
1717};
1718
1719static const struct constant_table ext4_param_dax[] = {
1720 {"always", Opt_dax_always},
1721 {"inode", Opt_dax_inode},
1722 {"never", Opt_dax_never},
1723 {}
1724};
1725
1726/* String parameter that allows empty argument */
1727#define fsparam_string_empty(NAME, OPT) \
1728 __fsparam(fs_param_is_string, NAME, OPT, fs_param_can_be_empty, NULL)
1729
1730/*
1731 * Mount option specification
1732 * We don't use fsparam_flag_no because of the way we set the
1733 * options and the way we show them in _ext4_show_options(). To
1734 * keep the changes to a minimum, let's keep the negative options
1735 * separate for now.
1736 */
1737static const struct fs_parameter_spec ext4_param_specs[] = {
1738 fsparam_flag ("bsddf", Opt_bsd_df),
1739 fsparam_flag ("minixdf", Opt_minix_df),
1740 fsparam_flag ("grpid", Opt_grpid),
1741 fsparam_flag ("bsdgroups", Opt_grpid),
1742 fsparam_flag ("nogrpid", Opt_nogrpid),
1743 fsparam_flag ("sysvgroups", Opt_nogrpid),
1744 fsparam_u32 ("resgid", Opt_resgid),
1745 fsparam_u32 ("resuid", Opt_resuid),
1746 fsparam_u32 ("sb", Opt_sb),
1747 fsparam_enum ("errors", Opt_errors, ext4_param_errors),
1748 fsparam_flag ("nouid32", Opt_nouid32),
1749 fsparam_flag ("debug", Opt_debug),
1750 fsparam_flag ("oldalloc", Opt_removed),
1751 fsparam_flag ("orlov", Opt_removed),
1752 fsparam_flag ("user_xattr", Opt_user_xattr),
1753 fsparam_flag ("acl", Opt_acl),
1754 fsparam_flag ("norecovery", Opt_noload),
1755 fsparam_flag ("noload", Opt_noload),
1756 fsparam_flag ("bh", Opt_removed),
1757 fsparam_flag ("nobh", Opt_removed),
1758 fsparam_u32 ("commit", Opt_commit),
1759 fsparam_u32 ("min_batch_time", Opt_min_batch_time),
1760 fsparam_u32 ("max_batch_time", Opt_max_batch_time),
1761 fsparam_u32 ("journal_dev", Opt_journal_dev),
1762 fsparam_bdev ("journal_path", Opt_journal_path),
1763 fsparam_flag ("journal_checksum", Opt_journal_checksum),
1764 fsparam_flag ("nojournal_checksum", Opt_nojournal_checksum),
1765 fsparam_flag ("journal_async_commit",Opt_journal_async_commit),
1766 fsparam_flag ("abort", Opt_abort),
1767 fsparam_enum ("data", Opt_data, ext4_param_data),
1768 fsparam_enum ("data_err", Opt_data_err,
1769 ext4_param_data_err),
1770 fsparam_string_empty
1771 ("usrjquota", Opt_usrjquota),
1772 fsparam_string_empty
1773 ("grpjquota", Opt_grpjquota),
1774 fsparam_enum ("jqfmt", Opt_jqfmt, ext4_param_jqfmt),
1775 fsparam_flag ("grpquota", Opt_grpquota),
1776 fsparam_flag ("quota", Opt_quota),
1777 fsparam_flag ("noquota", Opt_noquota),
1778 fsparam_flag ("usrquota", Opt_usrquota),
1779 fsparam_flag ("prjquota", Opt_prjquota),
1780 fsparam_flag ("barrier", Opt_barrier),
1781 fsparam_u32 ("barrier", Opt_barrier),
1782 fsparam_flag ("nobarrier", Opt_nobarrier),
1783 fsparam_flag ("i_version", Opt_removed),
1784 fsparam_flag ("dax", Opt_dax),
1785 fsparam_enum ("dax", Opt_dax_type, ext4_param_dax),
1786 fsparam_u32 ("stripe", Opt_stripe),
1787 fsparam_flag ("delalloc", Opt_delalloc),
1788 fsparam_flag ("nodelalloc", Opt_nodelalloc),
1789 fsparam_flag ("warn_on_error", Opt_warn_on_error),
1790 fsparam_flag ("nowarn_on_error", Opt_nowarn_on_error),
1791 fsparam_u32 ("debug_want_extra_isize",
1792 Opt_debug_want_extra_isize),
1793 fsparam_flag ("mblk_io_submit", Opt_removed),
1794 fsparam_flag ("nomblk_io_submit", Opt_removed),
1795 fsparam_flag ("block_validity", Opt_block_validity),
1796 fsparam_flag ("noblock_validity", Opt_noblock_validity),
1797 fsparam_u32 ("inode_readahead_blks",
1798 Opt_inode_readahead_blks),
1799 fsparam_u32 ("journal_ioprio", Opt_journal_ioprio),
1800 fsparam_u32 ("auto_da_alloc", Opt_auto_da_alloc),
1801 fsparam_flag ("auto_da_alloc", Opt_auto_da_alloc),
1802 fsparam_flag ("noauto_da_alloc", Opt_noauto_da_alloc),
1803 fsparam_flag ("dioread_nolock", Opt_dioread_nolock),
1804 fsparam_flag ("nodioread_nolock", Opt_dioread_lock),
1805 fsparam_flag ("dioread_lock", Opt_dioread_lock),
1806 fsparam_flag ("discard", Opt_discard),
1807 fsparam_flag ("nodiscard", Opt_nodiscard),
1808 fsparam_u32 ("init_itable", Opt_init_itable),
1809 fsparam_flag ("init_itable", Opt_init_itable),
1810 fsparam_flag ("noinit_itable", Opt_noinit_itable),
1811#ifdef CONFIG_EXT4_DEBUG
1812 fsparam_flag ("fc_debug_force", Opt_fc_debug_force),
1813 fsparam_u32 ("fc_debug_max_replay", Opt_fc_debug_max_replay),
1814#endif
1815 fsparam_u32 ("max_dir_size_kb", Opt_max_dir_size_kb),
1816 fsparam_flag ("test_dummy_encryption",
1817 Opt_test_dummy_encryption),
1818 fsparam_string ("test_dummy_encryption",
1819 Opt_test_dummy_encryption),
1820 fsparam_flag ("inlinecrypt", Opt_inlinecrypt),
1821 fsparam_flag ("nombcache", Opt_nombcache),
1822 fsparam_flag ("no_mbcache", Opt_nombcache), /* for backward compatibility */
1823 fsparam_flag ("prefetch_block_bitmaps",
1824 Opt_removed),
1825 fsparam_flag ("no_prefetch_block_bitmaps",
1826 Opt_no_prefetch_block_bitmaps),
1827 fsparam_s32 ("mb_optimize_scan", Opt_mb_optimize_scan),
1828 fsparam_string ("check", Opt_removed), /* mount option from ext2/3 */
1829 fsparam_flag ("nocheck", Opt_removed), /* mount option from ext2/3 */
1830 fsparam_flag ("reservation", Opt_removed), /* mount option from ext2/3 */
1831 fsparam_flag ("noreservation", Opt_removed), /* mount option from ext2/3 */
1832 fsparam_u32 ("journal", Opt_removed), /* mount option from ext2/3 */
1833 {}
1834};
1835
1836#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1837
1838#define MOPT_SET 0x0001
1839#define MOPT_CLEAR 0x0002
1840#define MOPT_NOSUPPORT 0x0004
1841#define MOPT_EXPLICIT 0x0008
1842#ifdef CONFIG_QUOTA
1843#define MOPT_Q 0
1844#define MOPT_QFMT 0x0010
1845#else
1846#define MOPT_Q MOPT_NOSUPPORT
1847#define MOPT_QFMT MOPT_NOSUPPORT
1848#endif
1849#define MOPT_NO_EXT2 0x0020
1850#define MOPT_NO_EXT3 0x0040
1851#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1852#define MOPT_SKIP 0x0080
1853#define MOPT_2 0x0100
1854
1855static const struct mount_opts {
1856 int token;
1857 int mount_opt;
1858 int flags;
1859} ext4_mount_opts[] = {
1860 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1861 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1862 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1863 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1864 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1865 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1866 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1867 MOPT_EXT4_ONLY | MOPT_SET},
1868 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1869 MOPT_EXT4_ONLY | MOPT_CLEAR},
1870 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1871 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1872 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1873 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1874 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1875 MOPT_EXT4_ONLY | MOPT_CLEAR},
1876 {Opt_warn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_SET},
1877 {Opt_nowarn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_CLEAR},
1878 {Opt_commit, 0, MOPT_NO_EXT2},
1879 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1880 MOPT_EXT4_ONLY | MOPT_CLEAR},
1881 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1882 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1883 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1884 EXT4_MOUNT_JOURNAL_CHECKSUM),
1885 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1886 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1887 {Opt_data_err, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_NO_EXT2},
1888 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1889 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1890 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1891 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1892 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1893 {Opt_dax_type, 0, MOPT_EXT4_ONLY},
1894 {Opt_journal_dev, 0, MOPT_NO_EXT2},
1895 {Opt_journal_path, 0, MOPT_NO_EXT2},
1896 {Opt_journal_ioprio, 0, MOPT_NO_EXT2},
1897 {Opt_data, 0, MOPT_NO_EXT2},
1898 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1899#ifdef CONFIG_EXT4_FS_POSIX_ACL
1900 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1901#else
1902 {Opt_acl, 0, MOPT_NOSUPPORT},
1903#endif
1904 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1905 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1906 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1907 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1908 MOPT_SET | MOPT_Q},
1909 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1910 MOPT_SET | MOPT_Q},
1911 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1912 MOPT_SET | MOPT_Q},
1913 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1914 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1915 MOPT_CLEAR | MOPT_Q},
1916 {Opt_usrjquota, 0, MOPT_Q},
1917 {Opt_grpjquota, 0, MOPT_Q},
1918 {Opt_jqfmt, 0, MOPT_QFMT},
1919 {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
1920 {Opt_no_prefetch_block_bitmaps, EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS,
1921 MOPT_SET},
1922#ifdef CONFIG_EXT4_DEBUG
1923 {Opt_fc_debug_force, EXT4_MOUNT2_JOURNAL_FAST_COMMIT,
1924 MOPT_SET | MOPT_2 | MOPT_EXT4_ONLY},
1925#endif
1926 {Opt_abort, EXT4_MOUNT2_ABORT, MOPT_SET | MOPT_2},
1927 {Opt_err, 0, 0}
1928};
1929
1930#if IS_ENABLED(CONFIG_UNICODE)
1931static const struct ext4_sb_encodings {
1932 __u16 magic;
1933 char *name;
1934 unsigned int version;
1935} ext4_sb_encoding_map[] = {
1936 {EXT4_ENC_UTF8_12_1, "utf8", UNICODE_AGE(12, 1, 0)},
1937};
1938
1939static const struct ext4_sb_encodings *
1940ext4_sb_read_encoding(const struct ext4_super_block *es)
1941{
1942 __u16 magic = le16_to_cpu(es->s_encoding);
1943 int i;
1944
1945 for (i = 0; i < ARRAY_SIZE(ext4_sb_encoding_map); i++)
1946 if (magic == ext4_sb_encoding_map[i].magic)
1947 return &ext4_sb_encoding_map[i];
1948
1949 return NULL;
1950}
1951#endif
1952
1953#define EXT4_SPEC_JQUOTA (1 << 0)
1954#define EXT4_SPEC_JQFMT (1 << 1)
1955#define EXT4_SPEC_DATAJ (1 << 2)
1956#define EXT4_SPEC_SB_BLOCK (1 << 3)
1957#define EXT4_SPEC_JOURNAL_DEV (1 << 4)
1958#define EXT4_SPEC_JOURNAL_IOPRIO (1 << 5)
1959#define EXT4_SPEC_s_want_extra_isize (1 << 7)
1960#define EXT4_SPEC_s_max_batch_time (1 << 8)
1961#define EXT4_SPEC_s_min_batch_time (1 << 9)
1962#define EXT4_SPEC_s_inode_readahead_blks (1 << 10)
1963#define EXT4_SPEC_s_li_wait_mult (1 << 11)
1964#define EXT4_SPEC_s_max_dir_size_kb (1 << 12)
1965#define EXT4_SPEC_s_stripe (1 << 13)
1966#define EXT4_SPEC_s_resuid (1 << 14)
1967#define EXT4_SPEC_s_resgid (1 << 15)
1968#define EXT4_SPEC_s_commit_interval (1 << 16)
1969#define EXT4_SPEC_s_fc_debug_max_replay (1 << 17)
1970#define EXT4_SPEC_s_sb_block (1 << 18)
1971#define EXT4_SPEC_mb_optimize_scan (1 << 19)
1972
1973struct ext4_fs_context {
1974 char *s_qf_names[EXT4_MAXQUOTAS];
1975 struct fscrypt_dummy_policy dummy_enc_policy;
1976 int s_jquota_fmt; /* Format of quota to use */
1977#ifdef CONFIG_EXT4_DEBUG
1978 int s_fc_debug_max_replay;
1979#endif
1980 unsigned short qname_spec;
1981 unsigned long vals_s_flags; /* Bits to set in s_flags */
1982 unsigned long mask_s_flags; /* Bits changed in s_flags */
1983 unsigned long journal_devnum;
1984 unsigned long s_commit_interval;
1985 unsigned long s_stripe;
1986 unsigned int s_inode_readahead_blks;
1987 unsigned int s_want_extra_isize;
1988 unsigned int s_li_wait_mult;
1989 unsigned int s_max_dir_size_kb;
1990 unsigned int journal_ioprio;
1991 unsigned int vals_s_mount_opt;
1992 unsigned int mask_s_mount_opt;
1993 unsigned int vals_s_mount_opt2;
1994 unsigned int mask_s_mount_opt2;
1995 unsigned int opt_flags; /* MOPT flags */
1996 unsigned int spec;
1997 u32 s_max_batch_time;
1998 u32 s_min_batch_time;
1999 kuid_t s_resuid;
2000 kgid_t s_resgid;
2001 ext4_fsblk_t s_sb_block;
2002};
2003
2004static void ext4_fc_free(struct fs_context *fc)
2005{
2006 struct ext4_fs_context *ctx = fc->fs_private;
2007 int i;
2008
2009 if (!ctx)
2010 return;
2011
2012 for (i = 0; i < EXT4_MAXQUOTAS; i++)
2013 kfree(ctx->s_qf_names[i]);
2014
2015 fscrypt_free_dummy_policy(&ctx->dummy_enc_policy);
2016 kfree(ctx);
2017}
2018
2019int ext4_init_fs_context(struct fs_context *fc)
2020{
2021 struct ext4_fs_context *ctx;
2022
2023 ctx = kzalloc(sizeof(struct ext4_fs_context), GFP_KERNEL);
2024 if (!ctx)
2025 return -ENOMEM;
2026
2027 fc->fs_private = ctx;
2028 fc->ops = &ext4_context_ops;
2029
2030 return 0;
2031}
2032
2033#ifdef CONFIG_QUOTA
2034/*
2035 * Note the name of the specified quota file.
2036 */
2037static int note_qf_name(struct fs_context *fc, int qtype,
2038 struct fs_parameter *param)
2039{
2040 struct ext4_fs_context *ctx = fc->fs_private;
2041 char *qname;
2042
2043 if (param->size < 1) {
2044 ext4_msg(NULL, KERN_ERR, "Missing quota name");
2045 return -EINVAL;
2046 }
2047 if (strchr(param->string, '/')) {
2048 ext4_msg(NULL, KERN_ERR,
2049 "quotafile must be on filesystem root");
2050 return -EINVAL;
2051 }
2052 if (ctx->s_qf_names[qtype]) {
2053 if (strcmp(ctx->s_qf_names[qtype], param->string) != 0) {
2054 ext4_msg(NULL, KERN_ERR,
2055 "%s quota file already specified",
2056 QTYPE2NAME(qtype));
2057 return -EINVAL;
2058 }
2059 return 0;
2060 }
2061
2062 qname = kmemdup_nul(param->string, param->size, GFP_KERNEL);
2063 if (!qname) {
2064 ext4_msg(NULL, KERN_ERR,
2065 "Not enough memory for storing quotafile name");
2066 return -ENOMEM;
2067 }
2068 ctx->s_qf_names[qtype] = qname;
2069 ctx->qname_spec |= 1 << qtype;
2070 ctx->spec |= EXT4_SPEC_JQUOTA;
2071 return 0;
2072}
2073
2074/*
2075 * Clear the name of the specified quota file.
2076 */
2077static int unnote_qf_name(struct fs_context *fc, int qtype)
2078{
2079 struct ext4_fs_context *ctx = fc->fs_private;
2080
2081 if (ctx->s_qf_names[qtype])
2082 kfree(ctx->s_qf_names[qtype]);
2083
2084 ctx->s_qf_names[qtype] = NULL;
2085 ctx->qname_spec |= 1 << qtype;
2086 ctx->spec |= EXT4_SPEC_JQUOTA;
2087 return 0;
2088}
2089#endif
2090
2091static int ext4_parse_test_dummy_encryption(const struct fs_parameter *param,
2092 struct ext4_fs_context *ctx)
2093{
2094 int err;
2095
2096 if (!IS_ENABLED(CONFIG_FS_ENCRYPTION)) {
2097 ext4_msg(NULL, KERN_WARNING,
2098 "test_dummy_encryption option not supported");
2099 return -EINVAL;
2100 }
2101 err = fscrypt_parse_test_dummy_encryption(param,
2102 &ctx->dummy_enc_policy);
2103 if (err == -EINVAL) {
2104 ext4_msg(NULL, KERN_WARNING,
2105 "Value of option \"%s\" is unrecognized", param->key);
2106 } else if (err == -EEXIST) {
2107 ext4_msg(NULL, KERN_WARNING,
2108 "Conflicting test_dummy_encryption options");
2109 return -EINVAL;
2110 }
2111 return err;
2112}
2113
2114#define EXT4_SET_CTX(name) \
2115static inline void ctx_set_##name(struct ext4_fs_context *ctx, \
2116 unsigned long flag) \
2117{ \
2118 ctx->mask_s_##name |= flag; \
2119 ctx->vals_s_##name |= flag; \
2120}
2121
2122#define EXT4_CLEAR_CTX(name) \
2123static inline void ctx_clear_##name(struct ext4_fs_context *ctx, \
2124 unsigned long flag) \
2125{ \
2126 ctx->mask_s_##name |= flag; \
2127 ctx->vals_s_##name &= ~flag; \
2128}
2129
2130#define EXT4_TEST_CTX(name) \
2131static inline unsigned long \
2132ctx_test_##name(struct ext4_fs_context *ctx, unsigned long flag) \
2133{ \
2134 return (ctx->vals_s_##name & flag); \
2135}
2136
2137EXT4_SET_CTX(flags); /* set only */
2138EXT4_SET_CTX(mount_opt);
2139EXT4_CLEAR_CTX(mount_opt);
2140EXT4_TEST_CTX(mount_opt);
2141EXT4_SET_CTX(mount_opt2);
2142EXT4_CLEAR_CTX(mount_opt2);
2143EXT4_TEST_CTX(mount_opt2);
2144
2145static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param)
2146{
2147 struct ext4_fs_context *ctx = fc->fs_private;
2148 struct fs_parse_result result;
2149 const struct mount_opts *m;
2150 int is_remount;
2151 kuid_t uid;
2152 kgid_t gid;
2153 int token;
2154
2155 token = fs_parse(fc, ext4_param_specs, param, &result);
2156 if (token < 0)
2157 return token;
2158 is_remount = fc->purpose == FS_CONTEXT_FOR_RECONFIGURE;
2159
2160 for (m = ext4_mount_opts; m->token != Opt_err; m++)
2161 if (token == m->token)
2162 break;
2163
2164 ctx->opt_flags |= m->flags;
2165
2166 if (m->flags & MOPT_EXPLICIT) {
2167 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
2168 ctx_set_mount_opt2(ctx, EXT4_MOUNT2_EXPLICIT_DELALLOC);
2169 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
2170 ctx_set_mount_opt2(ctx,
2171 EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM);
2172 } else
2173 return -EINVAL;
2174 }
2175
2176 if (m->flags & MOPT_NOSUPPORT) {
2177 ext4_msg(NULL, KERN_ERR, "%s option not supported",
2178 param->key);
2179 return 0;
2180 }
2181
2182 switch (token) {
2183#ifdef CONFIG_QUOTA
2184 case Opt_usrjquota:
2185 if (!*param->string)
2186 return unnote_qf_name(fc, USRQUOTA);
2187 else
2188 return note_qf_name(fc, USRQUOTA, param);
2189 case Opt_grpjquota:
2190 if (!*param->string)
2191 return unnote_qf_name(fc, GRPQUOTA);
2192 else
2193 return note_qf_name(fc, GRPQUOTA, param);
2194#endif
2195 case Opt_sb:
2196 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
2197 ext4_msg(NULL, KERN_WARNING,
2198 "Ignoring %s option on remount", param->key);
2199 } else {
2200 ctx->s_sb_block = result.uint_32;
2201 ctx->spec |= EXT4_SPEC_s_sb_block;
2202 }
2203 return 0;
2204 case Opt_removed:
2205 ext4_msg(NULL, KERN_WARNING, "Ignoring removed %s option",
2206 param->key);
2207 return 0;
2208 case Opt_inlinecrypt:
2209#ifdef CONFIG_FS_ENCRYPTION_INLINE_CRYPT
2210 ctx_set_flags(ctx, SB_INLINECRYPT);
2211#else
2212 ext4_msg(NULL, KERN_ERR, "inline encryption not supported");
2213#endif
2214 return 0;
2215 case Opt_errors:
2216 ctx_clear_mount_opt(ctx, EXT4_MOUNT_ERRORS_MASK);
2217 ctx_set_mount_opt(ctx, result.uint_32);
2218 return 0;
2219#ifdef CONFIG_QUOTA
2220 case Opt_jqfmt:
2221 ctx->s_jquota_fmt = result.uint_32;
2222 ctx->spec |= EXT4_SPEC_JQFMT;
2223 return 0;
2224#endif
2225 case Opt_data:
2226 ctx_clear_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS);
2227 ctx_set_mount_opt(ctx, result.uint_32);
2228 ctx->spec |= EXT4_SPEC_DATAJ;
2229 return 0;
2230 case Opt_commit:
2231 if (result.uint_32 == 0)
2232 result.uint_32 = JBD2_DEFAULT_MAX_COMMIT_AGE;
2233 else if (result.uint_32 > INT_MAX / HZ) {
2234 ext4_msg(NULL, KERN_ERR,
2235 "Invalid commit interval %d, "
2236 "must be smaller than %d",
2237 result.uint_32, INT_MAX / HZ);
2238 return -EINVAL;
2239 }
2240 ctx->s_commit_interval = HZ * result.uint_32;
2241 ctx->spec |= EXT4_SPEC_s_commit_interval;
2242 return 0;
2243 case Opt_debug_want_extra_isize:
2244 if ((result.uint_32 & 1) || (result.uint_32 < 4)) {
2245 ext4_msg(NULL, KERN_ERR,
2246 "Invalid want_extra_isize %d", result.uint_32);
2247 return -EINVAL;
2248 }
2249 ctx->s_want_extra_isize = result.uint_32;
2250 ctx->spec |= EXT4_SPEC_s_want_extra_isize;
2251 return 0;
2252 case Opt_max_batch_time:
2253 ctx->s_max_batch_time = result.uint_32;
2254 ctx->spec |= EXT4_SPEC_s_max_batch_time;
2255 return 0;
2256 case Opt_min_batch_time:
2257 ctx->s_min_batch_time = result.uint_32;
2258 ctx->spec |= EXT4_SPEC_s_min_batch_time;
2259 return 0;
2260 case Opt_inode_readahead_blks:
2261 if (result.uint_32 &&
2262 (result.uint_32 > (1 << 30) ||
2263 !is_power_of_2(result.uint_32))) {
2264 ext4_msg(NULL, KERN_ERR,
2265 "EXT4-fs: inode_readahead_blks must be "
2266 "0 or a power of 2 smaller than 2^31");
2267 return -EINVAL;
2268 }
2269 ctx->s_inode_readahead_blks = result.uint_32;
2270 ctx->spec |= EXT4_SPEC_s_inode_readahead_blks;
2271 return 0;
2272 case Opt_init_itable:
2273 ctx_set_mount_opt(ctx, EXT4_MOUNT_INIT_INODE_TABLE);
2274 ctx->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
2275 if (param->type == fs_value_is_string)
2276 ctx->s_li_wait_mult = result.uint_32;
2277 ctx->spec |= EXT4_SPEC_s_li_wait_mult;
2278 return 0;
2279 case Opt_max_dir_size_kb:
2280 ctx->s_max_dir_size_kb = result.uint_32;
2281 ctx->spec |= EXT4_SPEC_s_max_dir_size_kb;
2282 return 0;
2283#ifdef CONFIG_EXT4_DEBUG
2284 case Opt_fc_debug_max_replay:
2285 ctx->s_fc_debug_max_replay = result.uint_32;
2286 ctx->spec |= EXT4_SPEC_s_fc_debug_max_replay;
2287 return 0;
2288#endif
2289 case Opt_stripe:
2290 ctx->s_stripe = result.uint_32;
2291 ctx->spec |= EXT4_SPEC_s_stripe;
2292 return 0;
2293 case Opt_resuid:
2294 uid = make_kuid(current_user_ns(), result.uint_32);
2295 if (!uid_valid(uid)) {
2296 ext4_msg(NULL, KERN_ERR, "Invalid uid value %d",
2297 result.uint_32);
2298 return -EINVAL;
2299 }
2300 ctx->s_resuid = uid;
2301 ctx->spec |= EXT4_SPEC_s_resuid;
2302 return 0;
2303 case Opt_resgid:
2304 gid = make_kgid(current_user_ns(), result.uint_32);
2305 if (!gid_valid(gid)) {
2306 ext4_msg(NULL, KERN_ERR, "Invalid gid value %d",
2307 result.uint_32);
2308 return -EINVAL;
2309 }
2310 ctx->s_resgid = gid;
2311 ctx->spec |= EXT4_SPEC_s_resgid;
2312 return 0;
2313 case Opt_journal_dev:
2314 if (is_remount) {
2315 ext4_msg(NULL, KERN_ERR,
2316 "Cannot specify journal on remount");
2317 return -EINVAL;
2318 }
2319 ctx->journal_devnum = result.uint_32;
2320 ctx->spec |= EXT4_SPEC_JOURNAL_DEV;
2321 return 0;
2322 case Opt_journal_path:
2323 {
2324 struct inode *journal_inode;
2325 struct path path;
2326 int error;
2327
2328 if (is_remount) {
2329 ext4_msg(NULL, KERN_ERR,
2330 "Cannot specify journal on remount");
2331 return -EINVAL;
2332 }
2333
2334 error = fs_lookup_param(fc, param, 1, LOOKUP_FOLLOW, &path);
2335 if (error) {
2336 ext4_msg(NULL, KERN_ERR, "error: could not find "
2337 "journal device path");
2338 return -EINVAL;
2339 }
2340
2341 journal_inode = d_inode(path.dentry);
2342 ctx->journal_devnum = new_encode_dev(journal_inode->i_rdev);
2343 ctx->spec |= EXT4_SPEC_JOURNAL_DEV;
2344 path_put(&path);
2345 return 0;
2346 }
2347 case Opt_journal_ioprio:
2348 if (result.uint_32 > 7) {
2349 ext4_msg(NULL, KERN_ERR, "Invalid journal IO priority"
2350 " (must be 0-7)");
2351 return -EINVAL;
2352 }
2353 ctx->journal_ioprio =
2354 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, result.uint_32);
2355 ctx->spec |= EXT4_SPEC_JOURNAL_IOPRIO;
2356 return 0;
2357 case Opt_test_dummy_encryption:
2358 return ext4_parse_test_dummy_encryption(param, ctx);
2359 case Opt_dax:
2360 case Opt_dax_type:
2361#ifdef CONFIG_FS_DAX
2362 {
2363 int type = (token == Opt_dax) ?
2364 Opt_dax : result.uint_32;
2365
2366 switch (type) {
2367 case Opt_dax:
2368 case Opt_dax_always:
2369 ctx_set_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);
2370 ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);
2371 break;
2372 case Opt_dax_never:
2373 ctx_set_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);
2374 ctx_clear_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);
2375 break;
2376 case Opt_dax_inode:
2377 ctx_clear_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);
2378 ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);
2379 /* Strictly for printing options */
2380 ctx_set_mount_opt2(ctx, EXT4_MOUNT2_DAX_INODE);
2381 break;
2382 }
2383 return 0;
2384 }
2385#else
2386 ext4_msg(NULL, KERN_INFO, "dax option not supported");
2387 return -EINVAL;
2388#endif
2389 case Opt_data_err:
2390 if (result.uint_32 == Opt_data_err_abort)
2391 ctx_set_mount_opt(ctx, m->mount_opt);
2392 else if (result.uint_32 == Opt_data_err_ignore)
2393 ctx_clear_mount_opt(ctx, m->mount_opt);
2394 return 0;
2395 case Opt_mb_optimize_scan:
2396 if (result.int_32 == 1) {
2397 ctx_set_mount_opt2(ctx, EXT4_MOUNT2_MB_OPTIMIZE_SCAN);
2398 ctx->spec |= EXT4_SPEC_mb_optimize_scan;
2399 } else if (result.int_32 == 0) {
2400 ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_MB_OPTIMIZE_SCAN);
2401 ctx->spec |= EXT4_SPEC_mb_optimize_scan;
2402 } else {
2403 ext4_msg(NULL, KERN_WARNING,
2404 "mb_optimize_scan should be set to 0 or 1.");
2405 return -EINVAL;
2406 }
2407 return 0;
2408 }
2409
2410 /*
2411 * At this point we should only be getting options requiring MOPT_SET,
2412 * or MOPT_CLEAR. Anything else is a bug
2413 */
2414 if (m->token == Opt_err) {
2415 ext4_msg(NULL, KERN_WARNING, "buggy handling of option %s",
2416 param->key);
2417 WARN_ON(1);
2418 return -EINVAL;
2419 }
2420
2421 else {
2422 unsigned int set = 0;
2423
2424 if ((param->type == fs_value_is_flag) ||
2425 result.uint_32 > 0)
2426 set = 1;
2427
2428 if (m->flags & MOPT_CLEAR)
2429 set = !set;
2430 else if (unlikely(!(m->flags & MOPT_SET))) {
2431 ext4_msg(NULL, KERN_WARNING,
2432 "buggy handling of option %s",
2433 param->key);
2434 WARN_ON(1);
2435 return -EINVAL;
2436 }
2437 if (m->flags & MOPT_2) {
2438 if (set != 0)
2439 ctx_set_mount_opt2(ctx, m->mount_opt);
2440 else
2441 ctx_clear_mount_opt2(ctx, m->mount_opt);
2442 } else {
2443 if (set != 0)
2444 ctx_set_mount_opt(ctx, m->mount_opt);
2445 else
2446 ctx_clear_mount_opt(ctx, m->mount_opt);
2447 }
2448 }
2449
2450 return 0;
2451}
2452
2453static int parse_options(struct fs_context *fc, char *options)
2454{
2455 struct fs_parameter param;
2456 int ret;
2457 char *key;
2458
2459 if (!options)
2460 return 0;
2461
2462 while ((key = strsep(&options, ",")) != NULL) {
2463 if (*key) {
2464 size_t v_len = 0;
2465 char *value = strchr(key, '=');
2466
2467 param.type = fs_value_is_flag;
2468 param.string = NULL;
2469
2470 if (value) {
2471 if (value == key)
2472 continue;
2473
2474 *value++ = 0;
2475 v_len = strlen(value);
2476 param.string = kmemdup_nul(value, v_len,
2477 GFP_KERNEL);
2478 if (!param.string)
2479 return -ENOMEM;
2480 param.type = fs_value_is_string;
2481 }
2482
2483 param.key = key;
2484 param.size = v_len;
2485
2486 ret = ext4_parse_param(fc, ¶m);
2487 if (param.string)
2488 kfree(param.string);
2489 if (ret < 0)
2490 return ret;
2491 }
2492 }
2493
2494 ret = ext4_validate_options(fc);
2495 if (ret < 0)
2496 return ret;
2497
2498 return 0;
2499}
2500
2501static int parse_apply_sb_mount_options(struct super_block *sb,
2502 struct ext4_fs_context *m_ctx)
2503{
2504 struct ext4_sb_info *sbi = EXT4_SB(sb);
2505 char *s_mount_opts = NULL;
2506 struct ext4_fs_context *s_ctx = NULL;
2507 struct fs_context *fc = NULL;
2508 int ret = -ENOMEM;
2509
2510 if (!sbi->s_es->s_mount_opts[0])
2511 return 0;
2512
2513 s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
2514 sizeof(sbi->s_es->s_mount_opts),
2515 GFP_KERNEL);
2516 if (!s_mount_opts)
2517 return ret;
2518
2519 fc = kzalloc(sizeof(struct fs_context), GFP_KERNEL);
2520 if (!fc)
2521 goto out_free;
2522
2523 s_ctx = kzalloc(sizeof(struct ext4_fs_context), GFP_KERNEL);
2524 if (!s_ctx)
2525 goto out_free;
2526
2527 fc->fs_private = s_ctx;
2528 fc->s_fs_info = sbi;
2529
2530 ret = parse_options(fc, s_mount_opts);
2531 if (ret < 0)
2532 goto parse_failed;
2533
2534 ret = ext4_check_opt_consistency(fc, sb);
2535 if (ret < 0) {
2536parse_failed:
2537 ext4_msg(sb, KERN_WARNING,
2538 "failed to parse options in superblock: %s",
2539 s_mount_opts);
2540 ret = 0;
2541 goto out_free;
2542 }
2543
2544 if (s_ctx->spec & EXT4_SPEC_JOURNAL_DEV)
2545 m_ctx->journal_devnum = s_ctx->journal_devnum;
2546 if (s_ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO)
2547 m_ctx->journal_ioprio = s_ctx->journal_ioprio;
2548
2549 ext4_apply_options(fc, sb);
2550 ret = 0;
2551
2552out_free:
2553 if (fc) {
2554 ext4_fc_free(fc);
2555 kfree(fc);
2556 }
2557 kfree(s_mount_opts);
2558 return ret;
2559}
2560
2561static void ext4_apply_quota_options(struct fs_context *fc,
2562 struct super_block *sb)
2563{
2564#ifdef CONFIG_QUOTA
2565 bool quota_feature = ext4_has_feature_quota(sb);
2566 struct ext4_fs_context *ctx = fc->fs_private;
2567 struct ext4_sb_info *sbi = EXT4_SB(sb);
2568 char *qname;
2569 int i;
2570
2571 if (quota_feature)
2572 return;
2573
2574 if (ctx->spec & EXT4_SPEC_JQUOTA) {
2575 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2576 if (!(ctx->qname_spec & (1 << i)))
2577 continue;
2578
2579 qname = ctx->s_qf_names[i]; /* May be NULL */
2580 if (qname)
2581 set_opt(sb, QUOTA);
2582 ctx->s_qf_names[i] = NULL;
2583 qname = rcu_replace_pointer(sbi->s_qf_names[i], qname,
2584 lockdep_is_held(&sb->s_umount));
2585 if (qname)
2586 kfree_rcu_mightsleep(qname);
2587 }
2588 }
2589
2590 if (ctx->spec & EXT4_SPEC_JQFMT)
2591 sbi->s_jquota_fmt = ctx->s_jquota_fmt;
2592#endif
2593}
2594
2595/*
2596 * Check quota settings consistency.
2597 */
2598static int ext4_check_quota_consistency(struct fs_context *fc,
2599 struct super_block *sb)
2600{
2601#ifdef CONFIG_QUOTA
2602 struct ext4_fs_context *ctx = fc->fs_private;
2603 struct ext4_sb_info *sbi = EXT4_SB(sb);
2604 bool quota_feature = ext4_has_feature_quota(sb);
2605 bool quota_loaded = sb_any_quota_loaded(sb);
2606 bool usr_qf_name, grp_qf_name, usrquota, grpquota;
2607 int quota_flags, i;
2608
2609 /*
2610 * We do the test below only for project quotas. 'usrquota' and
2611 * 'grpquota' mount options are allowed even without quota feature
2612 * to support legacy quotas in quota files.
2613 */
2614 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_PRJQUOTA) &&
2615 !ext4_has_feature_project(sb)) {
2616 ext4_msg(NULL, KERN_ERR, "Project quota feature not enabled. "
2617 "Cannot enable project quota enforcement.");
2618 return -EINVAL;
2619 }
2620
2621 quota_flags = EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
2622 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA;
2623 if (quota_loaded &&
2624 ctx->mask_s_mount_opt & quota_flags &&
2625 !ctx_test_mount_opt(ctx, quota_flags))
2626 goto err_quota_change;
2627
2628 if (ctx->spec & EXT4_SPEC_JQUOTA) {
2629
2630 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2631 if (!(ctx->qname_spec & (1 << i)))
2632 continue;
2633
2634 if (quota_loaded &&
2635 !!sbi->s_qf_names[i] != !!ctx->s_qf_names[i])
2636 goto err_jquota_change;
2637
2638 if (sbi->s_qf_names[i] && ctx->s_qf_names[i] &&
2639 strcmp(get_qf_name(sb, sbi, i),
2640 ctx->s_qf_names[i]) != 0)
2641 goto err_jquota_specified;
2642 }
2643
2644 if (quota_feature) {
2645 ext4_msg(NULL, KERN_INFO,
2646 "Journaled quota options ignored when "
2647 "QUOTA feature is enabled");
2648 return 0;
2649 }
2650 }
2651
2652 if (ctx->spec & EXT4_SPEC_JQFMT) {
2653 if (sbi->s_jquota_fmt != ctx->s_jquota_fmt && quota_loaded)
2654 goto err_jquota_change;
2655 if (quota_feature) {
2656 ext4_msg(NULL, KERN_INFO, "Quota format mount options "
2657 "ignored when QUOTA feature is enabled");
2658 return 0;
2659 }
2660 }
2661
2662 /* Make sure we don't mix old and new quota format */
2663 usr_qf_name = (get_qf_name(sb, sbi, USRQUOTA) ||
2664 ctx->s_qf_names[USRQUOTA]);
2665 grp_qf_name = (get_qf_name(sb, sbi, GRPQUOTA) ||
2666 ctx->s_qf_names[GRPQUOTA]);
2667
2668 usrquota = (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) ||
2669 test_opt(sb, USRQUOTA));
2670
2671 grpquota = (ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA) ||
2672 test_opt(sb, GRPQUOTA));
2673
2674 if (usr_qf_name) {
2675 ctx_clear_mount_opt(ctx, EXT4_MOUNT_USRQUOTA);
2676 usrquota = false;
2677 }
2678 if (grp_qf_name) {
2679 ctx_clear_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA);
2680 grpquota = false;
2681 }
2682
2683 if (usr_qf_name || grp_qf_name) {
2684 if (usrquota || grpquota) {
2685 ext4_msg(NULL, KERN_ERR, "old and new quota "
2686 "format mixing");
2687 return -EINVAL;
2688 }
2689
2690 if (!(ctx->spec & EXT4_SPEC_JQFMT || sbi->s_jquota_fmt)) {
2691 ext4_msg(NULL, KERN_ERR, "journaled quota format "
2692 "not specified");
2693 return -EINVAL;
2694 }
2695 }
2696
2697 return 0;
2698
2699err_quota_change:
2700 ext4_msg(NULL, KERN_ERR,
2701 "Cannot change quota options when quota turned on");
2702 return -EINVAL;
2703err_jquota_change:
2704 ext4_msg(NULL, KERN_ERR, "Cannot change journaled quota "
2705 "options when quota turned on");
2706 return -EINVAL;
2707err_jquota_specified:
2708 ext4_msg(NULL, KERN_ERR, "%s quota file already specified",
2709 QTYPE2NAME(i));
2710 return -EINVAL;
2711#else
2712 return 0;
2713#endif
2714}
2715
2716static int ext4_check_test_dummy_encryption(const struct fs_context *fc,
2717 struct super_block *sb)
2718{
2719 const struct ext4_fs_context *ctx = fc->fs_private;
2720 const struct ext4_sb_info *sbi = EXT4_SB(sb);
2721
2722 if (!fscrypt_is_dummy_policy_set(&ctx->dummy_enc_policy))
2723 return 0;
2724
2725 if (!ext4_has_feature_encrypt(sb)) {
2726 ext4_msg(NULL, KERN_WARNING,
2727 "test_dummy_encryption requires encrypt feature");
2728 return -EINVAL;
2729 }
2730 /*
2731 * This mount option is just for testing, and it's not worthwhile to
2732 * implement the extra complexity (e.g. RCU protection) that would be
2733 * needed to allow it to be set or changed during remount. We do allow
2734 * it to be specified during remount, but only if there is no change.
2735 */
2736 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
2737 if (fscrypt_dummy_policies_equal(&sbi->s_dummy_enc_policy,
2738 &ctx->dummy_enc_policy))
2739 return 0;
2740 ext4_msg(NULL, KERN_WARNING,
2741 "Can't set or change test_dummy_encryption on remount");
2742 return -EINVAL;
2743 }
2744 /* Also make sure s_mount_opts didn't contain a conflicting value. */
2745 if (fscrypt_is_dummy_policy_set(&sbi->s_dummy_enc_policy)) {
2746 if (fscrypt_dummy_policies_equal(&sbi->s_dummy_enc_policy,
2747 &ctx->dummy_enc_policy))
2748 return 0;
2749 ext4_msg(NULL, KERN_WARNING,
2750 "Conflicting test_dummy_encryption options");
2751 return -EINVAL;
2752 }
2753 return 0;
2754}
2755
2756static void ext4_apply_test_dummy_encryption(struct ext4_fs_context *ctx,
2757 struct super_block *sb)
2758{
2759 if (!fscrypt_is_dummy_policy_set(&ctx->dummy_enc_policy) ||
2760 /* if already set, it was already verified to be the same */
2761 fscrypt_is_dummy_policy_set(&EXT4_SB(sb)->s_dummy_enc_policy))
2762 return;
2763 EXT4_SB(sb)->s_dummy_enc_policy = ctx->dummy_enc_policy;
2764 memset(&ctx->dummy_enc_policy, 0, sizeof(ctx->dummy_enc_policy));
2765 ext4_msg(sb, KERN_WARNING, "Test dummy encryption mode enabled");
2766}
2767
2768static int ext4_check_opt_consistency(struct fs_context *fc,
2769 struct super_block *sb)
2770{
2771 struct ext4_fs_context *ctx = fc->fs_private;
2772 struct ext4_sb_info *sbi = fc->s_fs_info;
2773 int is_remount = fc->purpose == FS_CONTEXT_FOR_RECONFIGURE;
2774 int err;
2775
2776 if ((ctx->opt_flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
2777 ext4_msg(NULL, KERN_ERR,
2778 "Mount option(s) incompatible with ext2");
2779 return -EINVAL;
2780 }
2781 if ((ctx->opt_flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
2782 ext4_msg(NULL, KERN_ERR,
2783 "Mount option(s) incompatible with ext3");
2784 return -EINVAL;
2785 }
2786
2787 if (ctx->s_want_extra_isize >
2788 (sbi->s_inode_size - EXT4_GOOD_OLD_INODE_SIZE)) {
2789 ext4_msg(NULL, KERN_ERR,
2790 "Invalid want_extra_isize %d",
2791 ctx->s_want_extra_isize);
2792 return -EINVAL;
2793 }
2794
2795 err = ext4_check_test_dummy_encryption(fc, sb);
2796 if (err)
2797 return err;
2798
2799 if ((ctx->spec & EXT4_SPEC_DATAJ) && is_remount) {
2800 if (!sbi->s_journal) {
2801 ext4_msg(NULL, KERN_WARNING,
2802 "Remounting file system with no journal "
2803 "so ignoring journalled data option");
2804 ctx_clear_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS);
2805 } else if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS) !=
2806 test_opt(sb, DATA_FLAGS)) {
2807 ext4_msg(NULL, KERN_ERR, "Cannot change data mode "
2808 "on remount");
2809 return -EINVAL;
2810 }
2811 }
2812
2813 if (is_remount) {
2814 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS) &&
2815 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
2816 ext4_msg(NULL, KERN_ERR, "can't mount with "
2817 "both data=journal and dax");
2818 return -EINVAL;
2819 }
2820
2821 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS) &&
2822 (!(sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) ||
2823 (sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER))) {
2824fail_dax_change_remount:
2825 ext4_msg(NULL, KERN_ERR, "can't change "
2826 "dax mount option while remounting");
2827 return -EINVAL;
2828 } else if (ctx_test_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER) &&
2829 (!(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER) ||
2830 (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS))) {
2831 goto fail_dax_change_remount;
2832 } else if (ctx_test_mount_opt2(ctx, EXT4_MOUNT2_DAX_INODE) &&
2833 ((sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) ||
2834 (sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER) ||
2835 !(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_INODE))) {
2836 goto fail_dax_change_remount;
2837 }
2838 }
2839
2840 return ext4_check_quota_consistency(fc, sb);
2841}
2842
2843static void ext4_apply_options(struct fs_context *fc, struct super_block *sb)
2844{
2845 struct ext4_fs_context *ctx = fc->fs_private;
2846 struct ext4_sb_info *sbi = fc->s_fs_info;
2847
2848 sbi->s_mount_opt &= ~ctx->mask_s_mount_opt;
2849 sbi->s_mount_opt |= ctx->vals_s_mount_opt;
2850 sbi->s_mount_opt2 &= ~ctx->mask_s_mount_opt2;
2851 sbi->s_mount_opt2 |= ctx->vals_s_mount_opt2;
2852 sb->s_flags &= ~ctx->mask_s_flags;
2853 sb->s_flags |= ctx->vals_s_flags;
2854
2855#define APPLY(X) ({ if (ctx->spec & EXT4_SPEC_##X) sbi->X = ctx->X; })
2856 APPLY(s_commit_interval);
2857 APPLY(s_stripe);
2858 APPLY(s_max_batch_time);
2859 APPLY(s_min_batch_time);
2860 APPLY(s_want_extra_isize);
2861 APPLY(s_inode_readahead_blks);
2862 APPLY(s_max_dir_size_kb);
2863 APPLY(s_li_wait_mult);
2864 APPLY(s_resgid);
2865 APPLY(s_resuid);
2866
2867#ifdef CONFIG_EXT4_DEBUG
2868 APPLY(s_fc_debug_max_replay);
2869#endif
2870
2871 ext4_apply_quota_options(fc, sb);
2872 ext4_apply_test_dummy_encryption(ctx, sb);
2873}
2874
2875
2876static int ext4_validate_options(struct fs_context *fc)
2877{
2878#ifdef CONFIG_QUOTA
2879 struct ext4_fs_context *ctx = fc->fs_private;
2880 char *usr_qf_name, *grp_qf_name;
2881
2882 usr_qf_name = ctx->s_qf_names[USRQUOTA];
2883 grp_qf_name = ctx->s_qf_names[GRPQUOTA];
2884
2885 if (usr_qf_name || grp_qf_name) {
2886 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) && usr_qf_name)
2887 ctx_clear_mount_opt(ctx, EXT4_MOUNT_USRQUOTA);
2888
2889 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA) && grp_qf_name)
2890 ctx_clear_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA);
2891
2892 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) ||
2893 ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA)) {
2894 ext4_msg(NULL, KERN_ERR, "old and new quota "
2895 "format mixing");
2896 return -EINVAL;
2897 }
2898 }
2899#endif
2900 return 1;
2901}
2902
2903static inline void ext4_show_quota_options(struct seq_file *seq,
2904 struct super_block *sb)
2905{
2906#if defined(CONFIG_QUOTA)
2907 struct ext4_sb_info *sbi = EXT4_SB(sb);
2908 char *usr_qf_name, *grp_qf_name;
2909
2910 if (sbi->s_jquota_fmt) {
2911 char *fmtname = "";
2912
2913 switch (sbi->s_jquota_fmt) {
2914 case QFMT_VFS_OLD:
2915 fmtname = "vfsold";
2916 break;
2917 case QFMT_VFS_V0:
2918 fmtname = "vfsv0";
2919 break;
2920 case QFMT_VFS_V1:
2921 fmtname = "vfsv1";
2922 break;
2923 }
2924 seq_printf(seq, ",jqfmt=%s", fmtname);
2925 }
2926
2927 rcu_read_lock();
2928 usr_qf_name = rcu_dereference(sbi->s_qf_names[USRQUOTA]);
2929 grp_qf_name = rcu_dereference(sbi->s_qf_names[GRPQUOTA]);
2930 if (usr_qf_name)
2931 seq_show_option(seq, "usrjquota", usr_qf_name);
2932 if (grp_qf_name)
2933 seq_show_option(seq, "grpjquota", grp_qf_name);
2934 rcu_read_unlock();
2935#endif
2936}
2937
2938static const char *token2str(int token)
2939{
2940 const struct fs_parameter_spec *spec;
2941
2942 for (spec = ext4_param_specs; spec->name != NULL; spec++)
2943 if (spec->opt == token && !spec->type)
2944 break;
2945 return spec->name;
2946}
2947
2948/*
2949 * Show an option if
2950 * - it's set to a non-default value OR
2951 * - if the per-sb default is different from the global default
2952 */
2953static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
2954 int nodefs)
2955{
2956 struct ext4_sb_info *sbi = EXT4_SB(sb);
2957 struct ext4_super_block *es = sbi->s_es;
2958 int def_errors;
2959 const struct mount_opts *m;
2960 char sep = nodefs ? '\n' : ',';
2961
2962#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2963#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2964
2965 if (sbi->s_sb_block != 1)
2966 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
2967
2968 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
2969 int want_set = m->flags & MOPT_SET;
2970 int opt_2 = m->flags & MOPT_2;
2971 unsigned int mount_opt, def_mount_opt;
2972
2973 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
2974 m->flags & MOPT_SKIP)
2975 continue;
2976
2977 if (opt_2) {
2978 mount_opt = sbi->s_mount_opt2;
2979 def_mount_opt = sbi->s_def_mount_opt2;
2980 } else {
2981 mount_opt = sbi->s_mount_opt;
2982 def_mount_opt = sbi->s_def_mount_opt;
2983 }
2984 /* skip if same as the default */
2985 if (!nodefs && !(m->mount_opt & (mount_opt ^ def_mount_opt)))
2986 continue;
2987 /* select Opt_noFoo vs Opt_Foo */
2988 if ((want_set &&
2989 (mount_opt & m->mount_opt) != m->mount_opt) ||
2990 (!want_set && (mount_opt & m->mount_opt)))
2991 continue;
2992 SEQ_OPTS_PRINT("%s", token2str(m->token));
2993 }
2994
2995 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
2996 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
2997 SEQ_OPTS_PRINT("resuid=%u",
2998 from_kuid_munged(&init_user_ns, sbi->s_resuid));
2999 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
3000 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
3001 SEQ_OPTS_PRINT("resgid=%u",
3002 from_kgid_munged(&init_user_ns, sbi->s_resgid));
3003 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
3004 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
3005 SEQ_OPTS_PUTS("errors=remount-ro");
3006 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
3007 SEQ_OPTS_PUTS("errors=continue");
3008 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
3009 SEQ_OPTS_PUTS("errors=panic");
3010 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
3011 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
3012 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
3013 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
3014 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
3015 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
3016 if (nodefs || sbi->s_stripe)
3017 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
3018 if (nodefs || EXT4_MOUNT_DATA_FLAGS &
3019 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
3020 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3021 SEQ_OPTS_PUTS("data=journal");
3022 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3023 SEQ_OPTS_PUTS("data=ordered");
3024 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
3025 SEQ_OPTS_PUTS("data=writeback");
3026 }
3027 if (nodefs ||
3028 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
3029 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
3030 sbi->s_inode_readahead_blks);
3031
3032 if (test_opt(sb, INIT_INODE_TABLE) && (nodefs ||
3033 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
3034 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
3035 if (nodefs || sbi->s_max_dir_size_kb)
3036 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
3037 if (test_opt(sb, DATA_ERR_ABORT))
3038 SEQ_OPTS_PUTS("data_err=abort");
3039
3040 fscrypt_show_test_dummy_encryption(seq, sep, sb);
3041
3042 if (sb->s_flags & SB_INLINECRYPT)
3043 SEQ_OPTS_PUTS("inlinecrypt");
3044
3045 if (test_opt(sb, DAX_ALWAYS)) {
3046 if (IS_EXT2_SB(sb))
3047 SEQ_OPTS_PUTS("dax");
3048 else
3049 SEQ_OPTS_PUTS("dax=always");
3050 } else if (test_opt2(sb, DAX_NEVER)) {
3051 SEQ_OPTS_PUTS("dax=never");
3052 } else if (test_opt2(sb, DAX_INODE)) {
3053 SEQ_OPTS_PUTS("dax=inode");
3054 }
3055
3056 if (sbi->s_groups_count >= MB_DEFAULT_LINEAR_SCAN_THRESHOLD &&
3057 !test_opt2(sb, MB_OPTIMIZE_SCAN)) {
3058 SEQ_OPTS_PUTS("mb_optimize_scan=0");
3059 } else if (sbi->s_groups_count < MB_DEFAULT_LINEAR_SCAN_THRESHOLD &&
3060 test_opt2(sb, MB_OPTIMIZE_SCAN)) {
3061 SEQ_OPTS_PUTS("mb_optimize_scan=1");
3062 }
3063
3064 ext4_show_quota_options(seq, sb);
3065 return 0;
3066}
3067
3068static int ext4_show_options(struct seq_file *seq, struct dentry *root)
3069{
3070 return _ext4_show_options(seq, root->d_sb, 0);
3071}
3072
3073int ext4_seq_options_show(struct seq_file *seq, void *offset)
3074{
3075 struct super_block *sb = seq->private;
3076 int rc;
3077
3078 seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");
3079 rc = _ext4_show_options(seq, sb, 1);
3080 seq_puts(seq, "\n");
3081 return rc;
3082}
3083
3084static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
3085 int read_only)
3086{
3087 struct ext4_sb_info *sbi = EXT4_SB(sb);
3088 int err = 0;
3089
3090 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
3091 ext4_msg(sb, KERN_ERR, "revision level too high, "
3092 "forcing read-only mode");
3093 err = -EROFS;
3094 goto done;
3095 }
3096 if (read_only)
3097 goto done;
3098 if (!(sbi->s_mount_state & EXT4_VALID_FS))
3099 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
3100 "running e2fsck is recommended");
3101 else if (sbi->s_mount_state & EXT4_ERROR_FS)
3102 ext4_msg(sb, KERN_WARNING,
3103 "warning: mounting fs with errors, "
3104 "running e2fsck is recommended");
3105 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
3106 le16_to_cpu(es->s_mnt_count) >=
3107 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
3108 ext4_msg(sb, KERN_WARNING,
3109 "warning: maximal mount count reached, "
3110 "running e2fsck is recommended");
3111 else if (le32_to_cpu(es->s_checkinterval) &&
3112 (ext4_get_tstamp(es, s_lastcheck) +
3113 le32_to_cpu(es->s_checkinterval) <= ktime_get_real_seconds()))
3114 ext4_msg(sb, KERN_WARNING,
3115 "warning: checktime reached, "
3116 "running e2fsck is recommended");
3117 if (!sbi->s_journal)
3118 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
3119 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
3120 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
3121 le16_add_cpu(&es->s_mnt_count, 1);
3122 ext4_update_tstamp(es, s_mtime);
3123 if (sbi->s_journal) {
3124 ext4_set_feature_journal_needs_recovery(sb);
3125 if (ext4_has_feature_orphan_file(sb))
3126 ext4_set_feature_orphan_present(sb);
3127 }
3128
3129 err = ext4_commit_super(sb);
3130done:
3131 if (test_opt(sb, DEBUG))
3132 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
3133 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
3134 sb->s_blocksize,
3135 sbi->s_groups_count,
3136 EXT4_BLOCKS_PER_GROUP(sb),
3137 EXT4_INODES_PER_GROUP(sb),
3138 sbi->s_mount_opt, sbi->s_mount_opt2);
3139 return err;
3140}
3141
3142int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
3143{
3144 struct ext4_sb_info *sbi = EXT4_SB(sb);
3145 struct flex_groups **old_groups, **new_groups;
3146 int size, i, j;
3147
3148 if (!sbi->s_log_groups_per_flex)
3149 return 0;
3150
3151 size = ext4_flex_group(sbi, ngroup - 1) + 1;
3152 if (size <= sbi->s_flex_groups_allocated)
3153 return 0;
3154
3155 new_groups = kvzalloc(roundup_pow_of_two(size *
3156 sizeof(*sbi->s_flex_groups)), GFP_KERNEL);
3157 if (!new_groups) {
3158 ext4_msg(sb, KERN_ERR,
3159 "not enough memory for %d flex group pointers", size);
3160 return -ENOMEM;
3161 }
3162 for (i = sbi->s_flex_groups_allocated; i < size; i++) {
3163 new_groups[i] = kvzalloc(roundup_pow_of_two(
3164 sizeof(struct flex_groups)),
3165 GFP_KERNEL);
3166 if (!new_groups[i]) {
3167 for (j = sbi->s_flex_groups_allocated; j < i; j++)
3168 kvfree(new_groups[j]);
3169 kvfree(new_groups);
3170 ext4_msg(sb, KERN_ERR,
3171 "not enough memory for %d flex groups", size);
3172 return -ENOMEM;
3173 }
3174 }
3175 rcu_read_lock();
3176 old_groups = rcu_dereference(sbi->s_flex_groups);
3177 if (old_groups)
3178 memcpy(new_groups, old_groups,
3179 (sbi->s_flex_groups_allocated *
3180 sizeof(struct flex_groups *)));
3181 rcu_read_unlock();
3182 rcu_assign_pointer(sbi->s_flex_groups, new_groups);
3183 sbi->s_flex_groups_allocated = size;
3184 if (old_groups)
3185 ext4_kvfree_array_rcu(old_groups);
3186 return 0;
3187}
3188
3189static int ext4_fill_flex_info(struct super_block *sb)
3190{
3191 struct ext4_sb_info *sbi = EXT4_SB(sb);
3192 struct ext4_group_desc *gdp = NULL;
3193 struct flex_groups *fg;
3194 ext4_group_t flex_group;
3195 int i, err;
3196
3197 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
3198 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
3199 sbi->s_log_groups_per_flex = 0;
3200 return 1;
3201 }
3202
3203 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
3204 if (err)
3205 goto failed;
3206
3207 for (i = 0; i < sbi->s_groups_count; i++) {
3208 gdp = ext4_get_group_desc(sb, i, NULL);
3209
3210 flex_group = ext4_flex_group(sbi, i);
3211 fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group);
3212 atomic_add(ext4_free_inodes_count(sb, gdp), &fg->free_inodes);
3213 atomic64_add(ext4_free_group_clusters(sb, gdp),
3214 &fg->free_clusters);
3215 atomic_add(ext4_used_dirs_count(sb, gdp), &fg->used_dirs);
3216 }
3217
3218 return 1;
3219failed:
3220 return 0;
3221}
3222
3223static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
3224 struct ext4_group_desc *gdp)
3225{
3226 int offset = offsetof(struct ext4_group_desc, bg_checksum);
3227 __u16 crc = 0;
3228 __le32 le_group = cpu_to_le32(block_group);
3229 struct ext4_sb_info *sbi = EXT4_SB(sb);
3230
3231 if (ext4_has_metadata_csum(sbi->s_sb)) {
3232 /* Use new metadata_csum algorithm */
3233 __u32 csum32;
3234 __u16 dummy_csum = 0;
3235
3236 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
3237 sizeof(le_group));
3238 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
3239 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
3240 sizeof(dummy_csum));
3241 offset += sizeof(dummy_csum);
3242 if (offset < sbi->s_desc_size)
3243 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
3244 sbi->s_desc_size - offset);
3245
3246 crc = csum32 & 0xFFFF;
3247 goto out;
3248 }
3249
3250 /* old crc16 code */
3251 if (!ext4_has_feature_gdt_csum(sb))
3252 return 0;
3253
3254 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
3255 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
3256 crc = crc16(crc, (__u8 *)gdp, offset);
3257 offset += sizeof(gdp->bg_checksum); /* skip checksum */
3258 /* for checksum of struct ext4_group_desc do the rest...*/
3259 if (ext4_has_feature_64bit(sb) && offset < sbi->s_desc_size)
3260 crc = crc16(crc, (__u8 *)gdp + offset,
3261 sbi->s_desc_size - offset);
3262
3263out:
3264 return cpu_to_le16(crc);
3265}
3266
3267int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
3268 struct ext4_group_desc *gdp)
3269{
3270 if (ext4_has_group_desc_csum(sb) &&
3271 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
3272 return 0;
3273
3274 return 1;
3275}
3276
3277void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
3278 struct ext4_group_desc *gdp)
3279{
3280 if (!ext4_has_group_desc_csum(sb))
3281 return;
3282 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
3283}
3284
3285/* Called at mount-time, super-block is locked */
3286static int ext4_check_descriptors(struct super_block *sb,
3287 ext4_fsblk_t sb_block,
3288 ext4_group_t *first_not_zeroed)
3289{
3290 struct ext4_sb_info *sbi = EXT4_SB(sb);
3291 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
3292 ext4_fsblk_t last_block;
3293 ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0);
3294 ext4_fsblk_t block_bitmap;
3295 ext4_fsblk_t inode_bitmap;
3296 ext4_fsblk_t inode_table;
3297 int flexbg_flag = 0;
3298 ext4_group_t i, grp = sbi->s_groups_count;
3299
3300 if (ext4_has_feature_flex_bg(sb))
3301 flexbg_flag = 1;
3302
3303 ext4_debug("Checking group descriptors");
3304
3305 for (i = 0; i < sbi->s_groups_count; i++) {
3306 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
3307
3308 if (i == sbi->s_groups_count - 1 || flexbg_flag)
3309 last_block = ext4_blocks_count(sbi->s_es) - 1;
3310 else
3311 last_block = first_block +
3312 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
3313
3314 if ((grp == sbi->s_groups_count) &&
3315 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3316 grp = i;
3317
3318 block_bitmap = ext4_block_bitmap(sb, gdp);
3319 if (block_bitmap == sb_block) {
3320 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3321 "Block bitmap for group %u overlaps "
3322 "superblock", i);
3323 if (!sb_rdonly(sb))
3324 return 0;
3325 }
3326 if (block_bitmap >= sb_block + 1 &&
3327 block_bitmap <= last_bg_block) {
3328 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3329 "Block bitmap for group %u overlaps "
3330 "block group descriptors", i);
3331 if (!sb_rdonly(sb))
3332 return 0;
3333 }
3334 if (block_bitmap < first_block || block_bitmap > last_block) {
3335 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3336 "Block bitmap for group %u not in group "
3337 "(block %llu)!", i, block_bitmap);
3338 return 0;
3339 }
3340 inode_bitmap = ext4_inode_bitmap(sb, gdp);
3341 if (inode_bitmap == sb_block) {
3342 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3343 "Inode bitmap for group %u overlaps "
3344 "superblock", i);
3345 if (!sb_rdonly(sb))
3346 return 0;
3347 }
3348 if (inode_bitmap >= sb_block + 1 &&
3349 inode_bitmap <= last_bg_block) {
3350 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3351 "Inode bitmap for group %u overlaps "
3352 "block group descriptors", i);
3353 if (!sb_rdonly(sb))
3354 return 0;
3355 }
3356 if (inode_bitmap < first_block || inode_bitmap > last_block) {
3357 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3358 "Inode bitmap for group %u not in group "
3359 "(block %llu)!", i, inode_bitmap);
3360 return 0;
3361 }
3362 inode_table = ext4_inode_table(sb, gdp);
3363 if (inode_table == sb_block) {
3364 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3365 "Inode table for group %u overlaps "
3366 "superblock", i);
3367 if (!sb_rdonly(sb))
3368 return 0;
3369 }
3370 if (inode_table >= sb_block + 1 &&
3371 inode_table <= last_bg_block) {
3372 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3373 "Inode table for group %u overlaps "
3374 "block group descriptors", i);
3375 if (!sb_rdonly(sb))
3376 return 0;
3377 }
3378 if (inode_table < first_block ||
3379 inode_table + sbi->s_itb_per_group - 1 > last_block) {
3380 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3381 "Inode table for group %u not in group "
3382 "(block %llu)!", i, inode_table);
3383 return 0;
3384 }
3385 ext4_lock_group(sb, i);
3386 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
3387 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3388 "Checksum for group %u failed (%u!=%u)",
3389 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
3390 gdp)), le16_to_cpu(gdp->bg_checksum));
3391 if (!sb_rdonly(sb)) {
3392 ext4_unlock_group(sb, i);
3393 return 0;
3394 }
3395 }
3396 ext4_unlock_group(sb, i);
3397 if (!flexbg_flag)
3398 first_block += EXT4_BLOCKS_PER_GROUP(sb);
3399 }
3400 if (NULL != first_not_zeroed)
3401 *first_not_zeroed = grp;
3402 return 1;
3403}
3404
3405/*
3406 * Maximal extent format file size.
3407 * Resulting logical blkno at s_maxbytes must fit in our on-disk
3408 * extent format containers, within a sector_t, and within i_blocks
3409 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
3410 * so that won't be a limiting factor.
3411 *
3412 * However there is other limiting factor. We do store extents in the form
3413 * of starting block and length, hence the resulting length of the extent
3414 * covering maximum file size must fit into on-disk format containers as
3415 * well. Given that length is always by 1 unit bigger than max unit (because
3416 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
3417 *
3418 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
3419 */
3420static loff_t ext4_max_size(int blkbits, int has_huge_files)
3421{
3422 loff_t res;
3423 loff_t upper_limit = MAX_LFS_FILESIZE;
3424
3425 BUILD_BUG_ON(sizeof(blkcnt_t) < sizeof(u64));
3426
3427 if (!has_huge_files) {
3428 upper_limit = (1LL << 32) - 1;
3429
3430 /* total blocks in file system block size */
3431 upper_limit >>= (blkbits - 9);
3432 upper_limit <<= blkbits;
3433 }
3434
3435 /*
3436 * 32-bit extent-start container, ee_block. We lower the maxbytes
3437 * by one fs block, so ee_len can cover the extent of maximum file
3438 * size
3439 */
3440 res = (1LL << 32) - 1;
3441 res <<= blkbits;
3442
3443 /* Sanity check against vm- & vfs- imposed limits */
3444 if (res > upper_limit)
3445 res = upper_limit;
3446
3447 return res;
3448}
3449
3450/*
3451 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
3452 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
3453 * We need to be 1 filesystem block less than the 2^48 sector limit.
3454 */
3455static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
3456{
3457 loff_t upper_limit, res = EXT4_NDIR_BLOCKS;
3458 int meta_blocks;
3459 unsigned int ppb = 1 << (bits - 2);
3460
3461 /*
3462 * This is calculated to be the largest file size for a dense, block
3463 * mapped file such that the file's total number of 512-byte sectors,
3464 * including data and all indirect blocks, does not exceed (2^48 - 1).
3465 *
3466 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
3467 * number of 512-byte sectors of the file.
3468 */
3469 if (!has_huge_files) {
3470 /*
3471 * !has_huge_files or implies that the inode i_block field
3472 * represents total file blocks in 2^32 512-byte sectors ==
3473 * size of vfs inode i_blocks * 8
3474 */
3475 upper_limit = (1LL << 32) - 1;
3476
3477 /* total blocks in file system block size */
3478 upper_limit >>= (bits - 9);
3479
3480 } else {
3481 /*
3482 * We use 48 bit ext4_inode i_blocks
3483 * With EXT4_HUGE_FILE_FL set the i_blocks
3484 * represent total number of blocks in
3485 * file system block size
3486 */
3487 upper_limit = (1LL << 48) - 1;
3488
3489 }
3490
3491 /* Compute how many blocks we can address by block tree */
3492 res += ppb;
3493 res += ppb * ppb;
3494 res += ((loff_t)ppb) * ppb * ppb;
3495 /* Compute how many metadata blocks are needed */
3496 meta_blocks = 1;
3497 meta_blocks += 1 + ppb;
3498 meta_blocks += 1 + ppb + ppb * ppb;
3499 /* Does block tree limit file size? */
3500 if (res + meta_blocks <= upper_limit)
3501 goto check_lfs;
3502
3503 res = upper_limit;
3504 /* How many metadata blocks are needed for addressing upper_limit? */
3505 upper_limit -= EXT4_NDIR_BLOCKS;
3506 /* indirect blocks */
3507 meta_blocks = 1;
3508 upper_limit -= ppb;
3509 /* double indirect blocks */
3510 if (upper_limit < ppb * ppb) {
3511 meta_blocks += 1 + DIV_ROUND_UP_ULL(upper_limit, ppb);
3512 res -= meta_blocks;
3513 goto check_lfs;
3514 }
3515 meta_blocks += 1 + ppb;
3516 upper_limit -= ppb * ppb;
3517 /* tripple indirect blocks for the rest */
3518 meta_blocks += 1 + DIV_ROUND_UP_ULL(upper_limit, ppb) +
3519 DIV_ROUND_UP_ULL(upper_limit, ppb*ppb);
3520 res -= meta_blocks;
3521check_lfs:
3522 res <<= bits;
3523 if (res > MAX_LFS_FILESIZE)
3524 res = MAX_LFS_FILESIZE;
3525
3526 return res;
3527}
3528
3529static ext4_fsblk_t descriptor_loc(struct super_block *sb,
3530 ext4_fsblk_t logical_sb_block, int nr)
3531{
3532 struct ext4_sb_info *sbi = EXT4_SB(sb);
3533 ext4_group_t bg, first_meta_bg;
3534 int has_super = 0;
3535
3536 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
3537
3538 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
3539 return logical_sb_block + nr + 1;
3540 bg = sbi->s_desc_per_block * nr;
3541 if (ext4_bg_has_super(sb, bg))
3542 has_super = 1;
3543
3544 /*
3545 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
3546 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
3547 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
3548 * compensate.
3549 */
3550 if (sb->s_blocksize == 1024 && nr == 0 &&
3551 le32_to_cpu(sbi->s_es->s_first_data_block) == 0)
3552 has_super++;
3553
3554 return (has_super + ext4_group_first_block_no(sb, bg));
3555}
3556
3557/**
3558 * ext4_get_stripe_size: Get the stripe size.
3559 * @sbi: In memory super block info
3560 *
3561 * If we have specified it via mount option, then
3562 * use the mount option value. If the value specified at mount time is
3563 * greater than the blocks per group use the super block value.
3564 * If the super block value is greater than blocks per group return 0.
3565 * Allocator needs it be less than blocks per group.
3566 *
3567 */
3568static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
3569{
3570 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
3571 unsigned long stripe_width =
3572 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3573 int ret;
3574
3575 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3576 ret = sbi->s_stripe;
3577 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
3578 ret = stripe_width;
3579 else if (stride && stride <= sbi->s_blocks_per_group)
3580 ret = stride;
3581 else
3582 ret = 0;
3583
3584 /*
3585 * If the stripe width is 1, this makes no sense and
3586 * we set it to 0 to turn off stripe handling code.
3587 */
3588 if (ret <= 1)
3589 ret = 0;
3590
3591 return ret;
3592}
3593
3594/*
3595 * Check whether this filesystem can be mounted based on
3596 * the features present and the RDONLY/RDWR mount requested.
3597 * Returns 1 if this filesystem can be mounted as requested,
3598 * 0 if it cannot be.
3599 */
3600int ext4_feature_set_ok(struct super_block *sb, int readonly)
3601{
3602 if (ext4_has_unknown_ext4_incompat_features(sb)) {
3603 ext4_msg(sb, KERN_ERR,
3604 "Couldn't mount because of "
3605 "unsupported optional features (%x)",
3606 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
3607 ~EXT4_FEATURE_INCOMPAT_SUPP));
3608 return 0;
3609 }
3610
3611#if !IS_ENABLED(CONFIG_UNICODE)
3612 if (ext4_has_feature_casefold(sb)) {
3613 ext4_msg(sb, KERN_ERR,
3614 "Filesystem with casefold feature cannot be "
3615 "mounted without CONFIG_UNICODE");
3616 return 0;
3617 }
3618#endif
3619
3620 if (readonly)
3621 return 1;
3622
3623 if (ext4_has_feature_readonly(sb)) {
3624 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
3625 sb->s_flags |= SB_RDONLY;
3626 return 1;
3627 }
3628
3629 /* Check that feature set is OK for a read-write mount */
3630 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
3631 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
3632 "unsupported optional features (%x)",
3633 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
3634 ~EXT4_FEATURE_RO_COMPAT_SUPP));
3635 return 0;
3636 }
3637 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
3638 ext4_msg(sb, KERN_ERR,
3639 "Can't support bigalloc feature without "
3640 "extents feature\n");
3641 return 0;
3642 }
3643
3644#if !IS_ENABLED(CONFIG_QUOTA) || !IS_ENABLED(CONFIG_QFMT_V2)
3645 if (!readonly && (ext4_has_feature_quota(sb) ||
3646 ext4_has_feature_project(sb))) {
3647 ext4_msg(sb, KERN_ERR,
3648 "The kernel was not built with CONFIG_QUOTA and CONFIG_QFMT_V2");
3649 return 0;
3650 }
3651#endif /* CONFIG_QUOTA */
3652 return 1;
3653}
3654
3655/*
3656 * This function is called once a day if we have errors logged
3657 * on the file system
3658 */
3659static void print_daily_error_info(struct timer_list *t)
3660{
3661 struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);
3662 struct super_block *sb = sbi->s_sb;
3663 struct ext4_super_block *es = sbi->s_es;
3664
3665 if (es->s_error_count)
3666 /* fsck newer than v1.41.13 is needed to clean this condition. */
3667 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
3668 le32_to_cpu(es->s_error_count));
3669 if (es->s_first_error_time) {
3670 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %llu: %.*s:%d",
3671 sb->s_id,
3672 ext4_get_tstamp(es, s_first_error_time),
3673 (int) sizeof(es->s_first_error_func),
3674 es->s_first_error_func,
3675 le32_to_cpu(es->s_first_error_line));
3676 if (es->s_first_error_ino)
3677 printk(KERN_CONT ": inode %u",
3678 le32_to_cpu(es->s_first_error_ino));
3679 if (es->s_first_error_block)
3680 printk(KERN_CONT ": block %llu", (unsigned long long)
3681 le64_to_cpu(es->s_first_error_block));
3682 printk(KERN_CONT "\n");
3683 }
3684 if (es->s_last_error_time) {
3685 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %llu: %.*s:%d",
3686 sb->s_id,
3687 ext4_get_tstamp(es, s_last_error_time),
3688 (int) sizeof(es->s_last_error_func),
3689 es->s_last_error_func,
3690 le32_to_cpu(es->s_last_error_line));
3691 if (es->s_last_error_ino)
3692 printk(KERN_CONT ": inode %u",
3693 le32_to_cpu(es->s_last_error_ino));
3694 if (es->s_last_error_block)
3695 printk(KERN_CONT ": block %llu", (unsigned long long)
3696 le64_to_cpu(es->s_last_error_block));
3697 printk(KERN_CONT "\n");
3698 }
3699 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
3700}
3701
3702/* Find next suitable group and run ext4_init_inode_table */
3703static int ext4_run_li_request(struct ext4_li_request *elr)
3704{
3705 struct ext4_group_desc *gdp = NULL;
3706 struct super_block *sb = elr->lr_super;
3707 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3708 ext4_group_t group = elr->lr_next_group;
3709 unsigned int prefetch_ios = 0;
3710 int ret = 0;
3711 int nr = EXT4_SB(sb)->s_mb_prefetch;
3712 u64 start_time;
3713
3714 if (elr->lr_mode == EXT4_LI_MODE_PREFETCH_BBITMAP) {
3715 elr->lr_next_group = ext4_mb_prefetch(sb, group, nr, &prefetch_ios);
3716 ext4_mb_prefetch_fini(sb, elr->lr_next_group, nr);
3717 trace_ext4_prefetch_bitmaps(sb, group, elr->lr_next_group, nr);
3718 if (group >= elr->lr_next_group) {
3719 ret = 1;
3720 if (elr->lr_first_not_zeroed != ngroups &&
3721 !sb_rdonly(sb) && test_opt(sb, INIT_INODE_TABLE)) {
3722 elr->lr_next_group = elr->lr_first_not_zeroed;
3723 elr->lr_mode = EXT4_LI_MODE_ITABLE;
3724 ret = 0;
3725 }
3726 }
3727 return ret;
3728 }
3729
3730 for (; group < ngroups; group++) {
3731 gdp = ext4_get_group_desc(sb, group, NULL);
3732 if (!gdp) {
3733 ret = 1;
3734 break;
3735 }
3736
3737 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3738 break;
3739 }
3740
3741 if (group >= ngroups)
3742 ret = 1;
3743
3744 if (!ret) {
3745 start_time = ktime_get_real_ns();
3746 ret = ext4_init_inode_table(sb, group,
3747 elr->lr_timeout ? 0 : 1);
3748 trace_ext4_lazy_itable_init(sb, group);
3749 if (elr->lr_timeout == 0) {
3750 elr->lr_timeout = nsecs_to_jiffies((ktime_get_real_ns() - start_time) *
3751 EXT4_SB(elr->lr_super)->s_li_wait_mult);
3752 }
3753 elr->lr_next_sched = jiffies + elr->lr_timeout;
3754 elr->lr_next_group = group + 1;
3755 }
3756 return ret;
3757}
3758
3759/*
3760 * Remove lr_request from the list_request and free the
3761 * request structure. Should be called with li_list_mtx held
3762 */
3763static void ext4_remove_li_request(struct ext4_li_request *elr)
3764{
3765 if (!elr)
3766 return;
3767
3768 list_del(&elr->lr_request);
3769 EXT4_SB(elr->lr_super)->s_li_request = NULL;
3770 kfree(elr);
3771}
3772
3773static void ext4_unregister_li_request(struct super_block *sb)
3774{
3775 mutex_lock(&ext4_li_mtx);
3776 if (!ext4_li_info) {
3777 mutex_unlock(&ext4_li_mtx);
3778 return;
3779 }
3780
3781 mutex_lock(&ext4_li_info->li_list_mtx);
3782 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
3783 mutex_unlock(&ext4_li_info->li_list_mtx);
3784 mutex_unlock(&ext4_li_mtx);
3785}
3786
3787static struct task_struct *ext4_lazyinit_task;
3788
3789/*
3790 * This is the function where ext4lazyinit thread lives. It walks
3791 * through the request list searching for next scheduled filesystem.
3792 * When such a fs is found, run the lazy initialization request
3793 * (ext4_rn_li_request) and keep track of the time spend in this
3794 * function. Based on that time we compute next schedule time of
3795 * the request. When walking through the list is complete, compute
3796 * next waking time and put itself into sleep.
3797 */
3798static int ext4_lazyinit_thread(void *arg)
3799{
3800 struct ext4_lazy_init *eli = arg;
3801 struct list_head *pos, *n;
3802 struct ext4_li_request *elr;
3803 unsigned long next_wakeup, cur;
3804
3805 BUG_ON(NULL == eli);
3806 set_freezable();
3807
3808cont_thread:
3809 while (true) {
3810 next_wakeup = MAX_JIFFY_OFFSET;
3811
3812 mutex_lock(&eli->li_list_mtx);
3813 if (list_empty(&eli->li_request_list)) {
3814 mutex_unlock(&eli->li_list_mtx);
3815 goto exit_thread;
3816 }
3817 list_for_each_safe(pos, n, &eli->li_request_list) {
3818 int err = 0;
3819 int progress = 0;
3820 elr = list_entry(pos, struct ext4_li_request,
3821 lr_request);
3822
3823 if (time_before(jiffies, elr->lr_next_sched)) {
3824 if (time_before(elr->lr_next_sched, next_wakeup))
3825 next_wakeup = elr->lr_next_sched;
3826 continue;
3827 }
3828 if (down_read_trylock(&elr->lr_super->s_umount)) {
3829 if (sb_start_write_trylock(elr->lr_super)) {
3830 progress = 1;
3831 /*
3832 * We hold sb->s_umount, sb can not
3833 * be removed from the list, it is
3834 * now safe to drop li_list_mtx
3835 */
3836 mutex_unlock(&eli->li_list_mtx);
3837 err = ext4_run_li_request(elr);
3838 sb_end_write(elr->lr_super);
3839 mutex_lock(&eli->li_list_mtx);
3840 n = pos->next;
3841 }
3842 up_read((&elr->lr_super->s_umount));
3843 }
3844 /* error, remove the lazy_init job */
3845 if (err) {
3846 ext4_remove_li_request(elr);
3847 continue;
3848 }
3849 if (!progress) {
3850 elr->lr_next_sched = jiffies +
3851 get_random_u32_below(EXT4_DEF_LI_MAX_START_DELAY * HZ);
3852 }
3853 if (time_before(elr->lr_next_sched, next_wakeup))
3854 next_wakeup = elr->lr_next_sched;
3855 }
3856 mutex_unlock(&eli->li_list_mtx);
3857
3858 try_to_freeze();
3859
3860 cur = jiffies;
3861 if ((time_after_eq(cur, next_wakeup)) ||
3862 (MAX_JIFFY_OFFSET == next_wakeup)) {
3863 cond_resched();
3864 continue;
3865 }
3866
3867 schedule_timeout_interruptible(next_wakeup - cur);
3868
3869 if (kthread_should_stop()) {
3870 ext4_clear_request_list();
3871 goto exit_thread;
3872 }
3873 }
3874
3875exit_thread:
3876 /*
3877 * It looks like the request list is empty, but we need
3878 * to check it under the li_list_mtx lock, to prevent any
3879 * additions into it, and of course we should lock ext4_li_mtx
3880 * to atomically free the list and ext4_li_info, because at
3881 * this point another ext4 filesystem could be registering
3882 * new one.
3883 */
3884 mutex_lock(&ext4_li_mtx);
3885 mutex_lock(&eli->li_list_mtx);
3886 if (!list_empty(&eli->li_request_list)) {
3887 mutex_unlock(&eli->li_list_mtx);
3888 mutex_unlock(&ext4_li_mtx);
3889 goto cont_thread;
3890 }
3891 mutex_unlock(&eli->li_list_mtx);
3892 kfree(ext4_li_info);
3893 ext4_li_info = NULL;
3894 mutex_unlock(&ext4_li_mtx);
3895
3896 return 0;
3897}
3898
3899static void ext4_clear_request_list(void)
3900{
3901 struct list_head *pos, *n;
3902 struct ext4_li_request *elr;
3903
3904 mutex_lock(&ext4_li_info->li_list_mtx);
3905 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3906 elr = list_entry(pos, struct ext4_li_request,
3907 lr_request);
3908 ext4_remove_li_request(elr);
3909 }
3910 mutex_unlock(&ext4_li_info->li_list_mtx);
3911}
3912
3913static int ext4_run_lazyinit_thread(void)
3914{
3915 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3916 ext4_li_info, "ext4lazyinit");
3917 if (IS_ERR(ext4_lazyinit_task)) {
3918 int err = PTR_ERR(ext4_lazyinit_task);
3919 ext4_clear_request_list();
3920 kfree(ext4_li_info);
3921 ext4_li_info = NULL;
3922 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
3923 "initialization thread\n",
3924 err);
3925 return err;
3926 }
3927 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
3928 return 0;
3929}
3930
3931/*
3932 * Check whether it make sense to run itable init. thread or not.
3933 * If there is at least one uninitialized inode table, return
3934 * corresponding group number, else the loop goes through all
3935 * groups and return total number of groups.
3936 */
3937static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3938{
3939 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3940 struct ext4_group_desc *gdp = NULL;
3941
3942 if (!ext4_has_group_desc_csum(sb))
3943 return ngroups;
3944
3945 for (group = 0; group < ngroups; group++) {
3946 gdp = ext4_get_group_desc(sb, group, NULL);
3947 if (!gdp)
3948 continue;
3949
3950 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3951 break;
3952 }
3953
3954 return group;
3955}
3956
3957static int ext4_li_info_new(void)
3958{
3959 struct ext4_lazy_init *eli = NULL;
3960
3961 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3962 if (!eli)
3963 return -ENOMEM;
3964
3965 INIT_LIST_HEAD(&eli->li_request_list);
3966 mutex_init(&eli->li_list_mtx);
3967
3968 eli->li_state |= EXT4_LAZYINIT_QUIT;
3969
3970 ext4_li_info = eli;
3971
3972 return 0;
3973}
3974
3975static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3976 ext4_group_t start)
3977{
3978 struct ext4_li_request *elr;
3979
3980 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3981 if (!elr)
3982 return NULL;
3983
3984 elr->lr_super = sb;
3985 elr->lr_first_not_zeroed = start;
3986 if (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS)) {
3987 elr->lr_mode = EXT4_LI_MODE_ITABLE;
3988 elr->lr_next_group = start;
3989 } else {
3990 elr->lr_mode = EXT4_LI_MODE_PREFETCH_BBITMAP;
3991 }
3992
3993 /*
3994 * Randomize first schedule time of the request to
3995 * spread the inode table initialization requests
3996 * better.
3997 */
3998 elr->lr_next_sched = jiffies + get_random_u32_below(EXT4_DEF_LI_MAX_START_DELAY * HZ);
3999 return elr;
4000}
4001
4002int ext4_register_li_request(struct super_block *sb,
4003 ext4_group_t first_not_zeroed)
4004{
4005 struct ext4_sb_info *sbi = EXT4_SB(sb);
4006 struct ext4_li_request *elr = NULL;
4007 ext4_group_t ngroups = sbi->s_groups_count;
4008 int ret = 0;
4009
4010 mutex_lock(&ext4_li_mtx);
4011 if (sbi->s_li_request != NULL) {
4012 /*
4013 * Reset timeout so it can be computed again, because
4014 * s_li_wait_mult might have changed.
4015 */
4016 sbi->s_li_request->lr_timeout = 0;
4017 goto out;
4018 }
4019
4020 if (sb_rdonly(sb) ||
4021 (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS) &&
4022 (first_not_zeroed == ngroups || !test_opt(sb, INIT_INODE_TABLE))))
4023 goto out;
4024
4025 elr = ext4_li_request_new(sb, first_not_zeroed);
4026 if (!elr) {
4027 ret = -ENOMEM;
4028 goto out;
4029 }
4030
4031 if (NULL == ext4_li_info) {
4032 ret = ext4_li_info_new();
4033 if (ret)
4034 goto out;
4035 }
4036
4037 mutex_lock(&ext4_li_info->li_list_mtx);
4038 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
4039 mutex_unlock(&ext4_li_info->li_list_mtx);
4040
4041 sbi->s_li_request = elr;
4042 /*
4043 * set elr to NULL here since it has been inserted to
4044 * the request_list and the removal and free of it is
4045 * handled by ext4_clear_request_list from now on.
4046 */
4047 elr = NULL;
4048
4049 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
4050 ret = ext4_run_lazyinit_thread();
4051 if (ret)
4052 goto out;
4053 }
4054out:
4055 mutex_unlock(&ext4_li_mtx);
4056 if (ret)
4057 kfree(elr);
4058 return ret;
4059}
4060
4061/*
4062 * We do not need to lock anything since this is called on
4063 * module unload.
4064 */
4065static void ext4_destroy_lazyinit_thread(void)
4066{
4067 /*
4068 * If thread exited earlier
4069 * there's nothing to be done.
4070 */
4071 if (!ext4_li_info || !ext4_lazyinit_task)
4072 return;
4073
4074 kthread_stop(ext4_lazyinit_task);
4075}
4076
4077static int set_journal_csum_feature_set(struct super_block *sb)
4078{
4079 int ret = 1;
4080 int compat, incompat;
4081 struct ext4_sb_info *sbi = EXT4_SB(sb);
4082
4083 if (ext4_has_metadata_csum(sb)) {
4084 /* journal checksum v3 */
4085 compat = 0;
4086 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
4087 } else {
4088 /* journal checksum v1 */
4089 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
4090 incompat = 0;
4091 }
4092
4093 jbd2_journal_clear_features(sbi->s_journal,
4094 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
4095 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
4096 JBD2_FEATURE_INCOMPAT_CSUM_V2);
4097 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4098 ret = jbd2_journal_set_features(sbi->s_journal,
4099 compat, 0,
4100 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
4101 incompat);
4102 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
4103 ret = jbd2_journal_set_features(sbi->s_journal,
4104 compat, 0,
4105 incompat);
4106 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
4107 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
4108 } else {
4109 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
4110 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
4111 }
4112
4113 return ret;
4114}
4115
4116/*
4117 * Note: calculating the overhead so we can be compatible with
4118 * historical BSD practice is quite difficult in the face of
4119 * clusters/bigalloc. This is because multiple metadata blocks from
4120 * different block group can end up in the same allocation cluster.
4121 * Calculating the exact overhead in the face of clustered allocation
4122 * requires either O(all block bitmaps) in memory or O(number of block
4123 * groups**2) in time. We will still calculate the superblock for
4124 * older file systems --- and if we come across with a bigalloc file
4125 * system with zero in s_overhead_clusters the estimate will be close to
4126 * correct especially for very large cluster sizes --- but for newer
4127 * file systems, it's better to calculate this figure once at mkfs
4128 * time, and store it in the superblock. If the superblock value is
4129 * present (even for non-bigalloc file systems), we will use it.
4130 */
4131static int count_overhead(struct super_block *sb, ext4_group_t grp,
4132 char *buf)
4133{
4134 struct ext4_sb_info *sbi = EXT4_SB(sb);
4135 struct ext4_group_desc *gdp;
4136 ext4_fsblk_t first_block, last_block, b;
4137 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
4138 int s, j, count = 0;
4139 int has_super = ext4_bg_has_super(sb, grp);
4140
4141 if (!ext4_has_feature_bigalloc(sb))
4142 return (has_super + ext4_bg_num_gdb(sb, grp) +
4143 (has_super ? le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) : 0) +
4144 sbi->s_itb_per_group + 2);
4145
4146 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
4147 (grp * EXT4_BLOCKS_PER_GROUP(sb));
4148 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
4149 for (i = 0; i < ngroups; i++) {
4150 gdp = ext4_get_group_desc(sb, i, NULL);
4151 b = ext4_block_bitmap(sb, gdp);
4152 if (b >= first_block && b <= last_block) {
4153 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
4154 count++;
4155 }
4156 b = ext4_inode_bitmap(sb, gdp);
4157 if (b >= first_block && b <= last_block) {
4158 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
4159 count++;
4160 }
4161 b = ext4_inode_table(sb, gdp);
4162 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
4163 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
4164 int c = EXT4_B2C(sbi, b - first_block);
4165 ext4_set_bit(c, buf);
4166 count++;
4167 }
4168 if (i != grp)
4169 continue;
4170 s = 0;
4171 if (ext4_bg_has_super(sb, grp)) {
4172 ext4_set_bit(s++, buf);
4173 count++;
4174 }
4175 j = ext4_bg_num_gdb(sb, grp);
4176 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
4177 ext4_error(sb, "Invalid number of block group "
4178 "descriptor blocks: %d", j);
4179 j = EXT4_BLOCKS_PER_GROUP(sb) - s;
4180 }
4181 count += j;
4182 for (; j > 0; j--)
4183 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
4184 }
4185 if (!count)
4186 return 0;
4187 return EXT4_CLUSTERS_PER_GROUP(sb) -
4188 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
4189}
4190
4191/*
4192 * Compute the overhead and stash it in sbi->s_overhead
4193 */
4194int ext4_calculate_overhead(struct super_block *sb)
4195{
4196 struct ext4_sb_info *sbi = EXT4_SB(sb);
4197 struct ext4_super_block *es = sbi->s_es;
4198 struct inode *j_inode;
4199 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
4200 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
4201 ext4_fsblk_t overhead = 0;
4202 char *buf = (char *) get_zeroed_page(GFP_NOFS);
4203
4204 if (!buf)
4205 return -ENOMEM;
4206
4207 /*
4208 * Compute the overhead (FS structures). This is constant
4209 * for a given filesystem unless the number of block groups
4210 * changes so we cache the previous value until it does.
4211 */
4212
4213 /*
4214 * All of the blocks before first_data_block are overhead
4215 */
4216 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
4217
4218 /*
4219 * Add the overhead found in each block group
4220 */
4221 for (i = 0; i < ngroups; i++) {
4222 int blks;
4223
4224 blks = count_overhead(sb, i, buf);
4225 overhead += blks;
4226 if (blks)
4227 memset(buf, 0, PAGE_SIZE);
4228 cond_resched();
4229 }
4230
4231 /*
4232 * Add the internal journal blocks whether the journal has been
4233 * loaded or not
4234 */
4235 if (sbi->s_journal && !sbi->s_journal_bdev_file)
4236 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_total_len);
4237 else if (ext4_has_feature_journal(sb) && !sbi->s_journal && j_inum) {
4238 /* j_inum for internal journal is non-zero */
4239 j_inode = ext4_get_journal_inode(sb, j_inum);
4240 if (!IS_ERR(j_inode)) {
4241 j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
4242 overhead += EXT4_NUM_B2C(sbi, j_blocks);
4243 iput(j_inode);
4244 } else {
4245 ext4_msg(sb, KERN_ERR, "can't get journal size");
4246 }
4247 }
4248 sbi->s_overhead = overhead;
4249 smp_wmb();
4250 free_page((unsigned long) buf);
4251 return 0;
4252}
4253
4254static void ext4_set_resv_clusters(struct super_block *sb)
4255{
4256 ext4_fsblk_t resv_clusters;
4257 struct ext4_sb_info *sbi = EXT4_SB(sb);
4258
4259 /*
4260 * There's no need to reserve anything when we aren't using extents.
4261 * The space estimates are exact, there are no unwritten extents,
4262 * hole punching doesn't need new metadata... This is needed especially
4263 * to keep ext2/3 backward compatibility.
4264 */
4265 if (!ext4_has_feature_extents(sb))
4266 return;
4267 /*
4268 * By default we reserve 2% or 4096 clusters, whichever is smaller.
4269 * This should cover the situations where we can not afford to run
4270 * out of space like for example punch hole, or converting
4271 * unwritten extents in delalloc path. In most cases such
4272 * allocation would require 1, or 2 blocks, higher numbers are
4273 * very rare.
4274 */
4275 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
4276 sbi->s_cluster_bits);
4277
4278 do_div(resv_clusters, 50);
4279 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
4280
4281 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
4282}
4283
4284static const char *ext4_quota_mode(struct super_block *sb)
4285{
4286#ifdef CONFIG_QUOTA
4287 if (!ext4_quota_capable(sb))
4288 return "none";
4289
4290 if (EXT4_SB(sb)->s_journal && ext4_is_quota_journalled(sb))
4291 return "journalled";
4292 else
4293 return "writeback";
4294#else
4295 return "disabled";
4296#endif
4297}
4298
4299static void ext4_setup_csum_trigger(struct super_block *sb,
4300 enum ext4_journal_trigger_type type,
4301 void (*trigger)(
4302 struct jbd2_buffer_trigger_type *type,
4303 struct buffer_head *bh,
4304 void *mapped_data,
4305 size_t size))
4306{
4307 struct ext4_sb_info *sbi = EXT4_SB(sb);
4308
4309 sbi->s_journal_triggers[type].sb = sb;
4310 sbi->s_journal_triggers[type].tr_triggers.t_frozen = trigger;
4311}
4312
4313static void ext4_free_sbi(struct ext4_sb_info *sbi)
4314{
4315 if (!sbi)
4316 return;
4317
4318 kfree(sbi->s_blockgroup_lock);
4319 fs_put_dax(sbi->s_daxdev, NULL);
4320 kfree(sbi);
4321}
4322
4323static struct ext4_sb_info *ext4_alloc_sbi(struct super_block *sb)
4324{
4325 struct ext4_sb_info *sbi;
4326
4327 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
4328 if (!sbi)
4329 return NULL;
4330
4331 sbi->s_daxdev = fs_dax_get_by_bdev(sb->s_bdev, &sbi->s_dax_part_off,
4332 NULL, NULL);
4333
4334 sbi->s_blockgroup_lock =
4335 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
4336
4337 if (!sbi->s_blockgroup_lock)
4338 goto err_out;
4339
4340 sb->s_fs_info = sbi;
4341 sbi->s_sb = sb;
4342 return sbi;
4343err_out:
4344 fs_put_dax(sbi->s_daxdev, NULL);
4345 kfree(sbi);
4346 return NULL;
4347}
4348
4349static void ext4_set_def_opts(struct super_block *sb,
4350 struct ext4_super_block *es)
4351{
4352 unsigned long def_mount_opts;
4353
4354 /* Set defaults before we parse the mount options */
4355 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
4356 set_opt(sb, INIT_INODE_TABLE);
4357 if (def_mount_opts & EXT4_DEFM_DEBUG)
4358 set_opt(sb, DEBUG);
4359 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
4360 set_opt(sb, GRPID);
4361 if (def_mount_opts & EXT4_DEFM_UID16)
4362 set_opt(sb, NO_UID32);
4363 /* xattr user namespace & acls are now defaulted on */
4364 set_opt(sb, XATTR_USER);
4365#ifdef CONFIG_EXT4_FS_POSIX_ACL
4366 set_opt(sb, POSIX_ACL);
4367#endif
4368 if (ext4_has_feature_fast_commit(sb))
4369 set_opt2(sb, JOURNAL_FAST_COMMIT);
4370 /* don't forget to enable journal_csum when metadata_csum is enabled. */
4371 if (ext4_has_metadata_csum(sb))
4372 set_opt(sb, JOURNAL_CHECKSUM);
4373
4374 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
4375 set_opt(sb, JOURNAL_DATA);
4376 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
4377 set_opt(sb, ORDERED_DATA);
4378 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
4379 set_opt(sb, WRITEBACK_DATA);
4380
4381 if (le16_to_cpu(es->s_errors) == EXT4_ERRORS_PANIC)
4382 set_opt(sb, ERRORS_PANIC);
4383 else if (le16_to_cpu(es->s_errors) == EXT4_ERRORS_CONTINUE)
4384 set_opt(sb, ERRORS_CONT);
4385 else
4386 set_opt(sb, ERRORS_RO);
4387 /* block_validity enabled by default; disable with noblock_validity */
4388 set_opt(sb, BLOCK_VALIDITY);
4389 if (def_mount_opts & EXT4_DEFM_DISCARD)
4390 set_opt(sb, DISCARD);
4391
4392 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
4393 set_opt(sb, BARRIER);
4394
4395 /*
4396 * enable delayed allocation by default
4397 * Use -o nodelalloc to turn it off
4398 */
4399 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
4400 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
4401 set_opt(sb, DELALLOC);
4402
4403 if (sb->s_blocksize <= PAGE_SIZE)
4404 set_opt(sb, DIOREAD_NOLOCK);
4405}
4406
4407static int ext4_handle_clustersize(struct super_block *sb)
4408{
4409 struct ext4_sb_info *sbi = EXT4_SB(sb);
4410 struct ext4_super_block *es = sbi->s_es;
4411 int clustersize;
4412
4413 /* Handle clustersize */
4414 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
4415 if (ext4_has_feature_bigalloc(sb)) {
4416 if (clustersize < sb->s_blocksize) {
4417 ext4_msg(sb, KERN_ERR,
4418 "cluster size (%d) smaller than "
4419 "block size (%lu)", clustersize, sb->s_blocksize);
4420 return -EINVAL;
4421 }
4422 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
4423 le32_to_cpu(es->s_log_block_size);
4424 } else {
4425 if (clustersize != sb->s_blocksize) {
4426 ext4_msg(sb, KERN_ERR,
4427 "fragment/cluster size (%d) != "
4428 "block size (%lu)", clustersize, sb->s_blocksize);
4429 return -EINVAL;
4430 }
4431 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
4432 ext4_msg(sb, KERN_ERR,
4433 "#blocks per group too big: %lu",
4434 sbi->s_blocks_per_group);
4435 return -EINVAL;
4436 }
4437 sbi->s_cluster_bits = 0;
4438 }
4439 sbi->s_clusters_per_group = le32_to_cpu(es->s_clusters_per_group);
4440 if (sbi->s_clusters_per_group > sb->s_blocksize * 8) {
4441 ext4_msg(sb, KERN_ERR, "#clusters per group too big: %lu",
4442 sbi->s_clusters_per_group);
4443 return -EINVAL;
4444 }
4445 if (sbi->s_blocks_per_group !=
4446 (sbi->s_clusters_per_group * (clustersize / sb->s_blocksize))) {
4447 ext4_msg(sb, KERN_ERR,
4448 "blocks per group (%lu) and clusters per group (%lu) inconsistent",
4449 sbi->s_blocks_per_group, sbi->s_clusters_per_group);
4450 return -EINVAL;
4451 }
4452 sbi->s_cluster_ratio = clustersize / sb->s_blocksize;
4453
4454 /* Do we have standard group size of clustersize * 8 blocks ? */
4455 if (sbi->s_blocks_per_group == clustersize << 3)
4456 set_opt2(sb, STD_GROUP_SIZE);
4457
4458 return 0;
4459}
4460
4461static void ext4_fast_commit_init(struct super_block *sb)
4462{
4463 struct ext4_sb_info *sbi = EXT4_SB(sb);
4464
4465 /* Initialize fast commit stuff */
4466 atomic_set(&sbi->s_fc_subtid, 0);
4467 INIT_LIST_HEAD(&sbi->s_fc_q[FC_Q_MAIN]);
4468 INIT_LIST_HEAD(&sbi->s_fc_q[FC_Q_STAGING]);
4469 INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_MAIN]);
4470 INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_STAGING]);
4471 sbi->s_fc_bytes = 0;
4472 ext4_clear_mount_flag(sb, EXT4_MF_FC_INELIGIBLE);
4473 sbi->s_fc_ineligible_tid = 0;
4474 spin_lock_init(&sbi->s_fc_lock);
4475 memset(&sbi->s_fc_stats, 0, sizeof(sbi->s_fc_stats));
4476 sbi->s_fc_replay_state.fc_regions = NULL;
4477 sbi->s_fc_replay_state.fc_regions_size = 0;
4478 sbi->s_fc_replay_state.fc_regions_used = 0;
4479 sbi->s_fc_replay_state.fc_regions_valid = 0;
4480 sbi->s_fc_replay_state.fc_modified_inodes = NULL;
4481 sbi->s_fc_replay_state.fc_modified_inodes_size = 0;
4482 sbi->s_fc_replay_state.fc_modified_inodes_used = 0;
4483}
4484
4485static int ext4_inode_info_init(struct super_block *sb,
4486 struct ext4_super_block *es)
4487{
4488 struct ext4_sb_info *sbi = EXT4_SB(sb);
4489
4490 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
4491 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
4492 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
4493 } else {
4494 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
4495 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
4496 if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) {
4497 ext4_msg(sb, KERN_ERR, "invalid first ino: %u",
4498 sbi->s_first_ino);
4499 return -EINVAL;
4500 }
4501 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
4502 (!is_power_of_2(sbi->s_inode_size)) ||
4503 (sbi->s_inode_size > sb->s_blocksize)) {
4504 ext4_msg(sb, KERN_ERR,
4505 "unsupported inode size: %d",
4506 sbi->s_inode_size);
4507 ext4_msg(sb, KERN_ERR, "blocksize: %lu", sb->s_blocksize);
4508 return -EINVAL;
4509 }
4510 /*
4511 * i_atime_extra is the last extra field available for
4512 * [acm]times in struct ext4_inode. Checking for that
4513 * field should suffice to ensure we have extra space
4514 * for all three.
4515 */
4516 if (sbi->s_inode_size >= offsetof(struct ext4_inode, i_atime_extra) +
4517 sizeof(((struct ext4_inode *)0)->i_atime_extra)) {
4518 sb->s_time_gran = 1;
4519 sb->s_time_max = EXT4_EXTRA_TIMESTAMP_MAX;
4520 } else {
4521 sb->s_time_gran = NSEC_PER_SEC;
4522 sb->s_time_max = EXT4_NON_EXTRA_TIMESTAMP_MAX;
4523 }
4524 sb->s_time_min = EXT4_TIMESTAMP_MIN;
4525 }
4526
4527 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
4528 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4529 EXT4_GOOD_OLD_INODE_SIZE;
4530 if (ext4_has_feature_extra_isize(sb)) {
4531 unsigned v, max = (sbi->s_inode_size -
4532 EXT4_GOOD_OLD_INODE_SIZE);
4533
4534 v = le16_to_cpu(es->s_want_extra_isize);
4535 if (v > max) {
4536 ext4_msg(sb, KERN_ERR,
4537 "bad s_want_extra_isize: %d", v);
4538 return -EINVAL;
4539 }
4540 if (sbi->s_want_extra_isize < v)
4541 sbi->s_want_extra_isize = v;
4542
4543 v = le16_to_cpu(es->s_min_extra_isize);
4544 if (v > max) {
4545 ext4_msg(sb, KERN_ERR,
4546 "bad s_min_extra_isize: %d", v);
4547 return -EINVAL;
4548 }
4549 if (sbi->s_want_extra_isize < v)
4550 sbi->s_want_extra_isize = v;
4551 }
4552 }
4553
4554 return 0;
4555}
4556
4557#if IS_ENABLED(CONFIG_UNICODE)
4558static int ext4_encoding_init(struct super_block *sb, struct ext4_super_block *es)
4559{
4560 const struct ext4_sb_encodings *encoding_info;
4561 struct unicode_map *encoding;
4562 __u16 encoding_flags = le16_to_cpu(es->s_encoding_flags);
4563
4564 if (!ext4_has_feature_casefold(sb) || sb->s_encoding)
4565 return 0;
4566
4567 encoding_info = ext4_sb_read_encoding(es);
4568 if (!encoding_info) {
4569 ext4_msg(sb, KERN_ERR,
4570 "Encoding requested by superblock is unknown");
4571 return -EINVAL;
4572 }
4573
4574 encoding = utf8_load(encoding_info->version);
4575 if (IS_ERR(encoding)) {
4576 ext4_msg(sb, KERN_ERR,
4577 "can't mount with superblock charset: %s-%u.%u.%u "
4578 "not supported by the kernel. flags: 0x%x.",
4579 encoding_info->name,
4580 unicode_major(encoding_info->version),
4581 unicode_minor(encoding_info->version),
4582 unicode_rev(encoding_info->version),
4583 encoding_flags);
4584 return -EINVAL;
4585 }
4586 ext4_msg(sb, KERN_INFO,"Using encoding defined by superblock: "
4587 "%s-%u.%u.%u with flags 0x%hx", encoding_info->name,
4588 unicode_major(encoding_info->version),
4589 unicode_minor(encoding_info->version),
4590 unicode_rev(encoding_info->version),
4591 encoding_flags);
4592
4593 sb->s_encoding = encoding;
4594 sb->s_encoding_flags = encoding_flags;
4595
4596 return 0;
4597}
4598#else
4599static inline int ext4_encoding_init(struct super_block *sb, struct ext4_super_block *es)
4600{
4601 return 0;
4602}
4603#endif
4604
4605static int ext4_init_metadata_csum(struct super_block *sb, struct ext4_super_block *es)
4606{
4607 struct ext4_sb_info *sbi = EXT4_SB(sb);
4608
4609 /* Warn if metadata_csum and gdt_csum are both set. */
4610 if (ext4_has_feature_metadata_csum(sb) &&
4611 ext4_has_feature_gdt_csum(sb))
4612 ext4_warning(sb, "metadata_csum and uninit_bg are "
4613 "redundant flags; please run fsck.");
4614
4615 /* Check for a known checksum algorithm */
4616 if (!ext4_verify_csum_type(sb, es)) {
4617 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
4618 "unknown checksum algorithm.");
4619 return -EINVAL;
4620 }
4621 ext4_setup_csum_trigger(sb, EXT4_JTR_ORPHAN_FILE,
4622 ext4_orphan_file_block_trigger);
4623
4624 /* Load the checksum driver */
4625 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
4626 if (IS_ERR(sbi->s_chksum_driver)) {
4627 int ret = PTR_ERR(sbi->s_chksum_driver);
4628 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
4629 sbi->s_chksum_driver = NULL;
4630 return ret;
4631 }
4632
4633 /* Check superblock checksum */
4634 if (!ext4_superblock_csum_verify(sb, es)) {
4635 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
4636 "invalid superblock checksum. Run e2fsck?");
4637 return -EFSBADCRC;
4638 }
4639
4640 /* Precompute checksum seed for all metadata */
4641 if (ext4_has_feature_csum_seed(sb))
4642 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
4643 else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
4644 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
4645 sizeof(es->s_uuid));
4646 return 0;
4647}
4648
4649static int ext4_check_feature_compatibility(struct super_block *sb,
4650 struct ext4_super_block *es,
4651 int silent)
4652{
4653 struct ext4_sb_info *sbi = EXT4_SB(sb);
4654
4655 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
4656 (ext4_has_compat_features(sb) ||
4657 ext4_has_ro_compat_features(sb) ||
4658 ext4_has_incompat_features(sb)))
4659 ext4_msg(sb, KERN_WARNING,
4660 "feature flags set on rev 0 fs, "
4661 "running e2fsck is recommended");
4662
4663 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
4664 set_opt2(sb, HURD_COMPAT);
4665 if (ext4_has_feature_64bit(sb)) {
4666 ext4_msg(sb, KERN_ERR,
4667 "The Hurd can't support 64-bit file systems");
4668 return -EINVAL;
4669 }
4670
4671 /*
4672 * ea_inode feature uses l_i_version field which is not
4673 * available in HURD_COMPAT mode.
4674 */
4675 if (ext4_has_feature_ea_inode(sb)) {
4676 ext4_msg(sb, KERN_ERR,
4677 "ea_inode feature is not supported for Hurd");
4678 return -EINVAL;
4679 }
4680 }
4681
4682 if (IS_EXT2_SB(sb)) {
4683 if (ext2_feature_set_ok(sb))
4684 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
4685 "using the ext4 subsystem");
4686 else {
4687 /*
4688 * If we're probing be silent, if this looks like
4689 * it's actually an ext[34] filesystem.
4690 */
4691 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
4692 return -EINVAL;
4693 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
4694 "to feature incompatibilities");
4695 return -EINVAL;
4696 }
4697 }
4698
4699 if (IS_EXT3_SB(sb)) {
4700 if (ext3_feature_set_ok(sb))
4701 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
4702 "using the ext4 subsystem");
4703 else {
4704 /*
4705 * If we're probing be silent, if this looks like
4706 * it's actually an ext4 filesystem.
4707 */
4708 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
4709 return -EINVAL;
4710 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
4711 "to feature incompatibilities");
4712 return -EINVAL;
4713 }
4714 }
4715
4716 /*
4717 * Check feature flags regardless of the revision level, since we
4718 * previously didn't change the revision level when setting the flags,
4719 * so there is a chance incompat flags are set on a rev 0 filesystem.
4720 */
4721 if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))
4722 return -EINVAL;
4723
4724 if (sbi->s_daxdev) {
4725 if (sb->s_blocksize == PAGE_SIZE)
4726 set_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags);
4727 else
4728 ext4_msg(sb, KERN_ERR, "unsupported blocksize for DAX\n");
4729 }
4730
4731 if (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) {
4732 if (ext4_has_feature_inline_data(sb)) {
4733 ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
4734 " that may contain inline data");
4735 return -EINVAL;
4736 }
4737 if (!test_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags)) {
4738 ext4_msg(sb, KERN_ERR,
4739 "DAX unsupported by block device.");
4740 return -EINVAL;
4741 }
4742 }
4743
4744 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
4745 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
4746 es->s_encryption_level);
4747 return -EINVAL;
4748 }
4749
4750 return 0;
4751}
4752
4753static int ext4_check_geometry(struct super_block *sb,
4754 struct ext4_super_block *es)
4755{
4756 struct ext4_sb_info *sbi = EXT4_SB(sb);
4757 __u64 blocks_count;
4758 int err;
4759
4760 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (sb->s_blocksize / 4)) {
4761 ext4_msg(sb, KERN_ERR,
4762 "Number of reserved GDT blocks insanely large: %d",
4763 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
4764 return -EINVAL;
4765 }
4766 /*
4767 * Test whether we have more sectors than will fit in sector_t,
4768 * and whether the max offset is addressable by the page cache.
4769 */
4770 err = generic_check_addressable(sb->s_blocksize_bits,
4771 ext4_blocks_count(es));
4772 if (err) {
4773 ext4_msg(sb, KERN_ERR, "filesystem"
4774 " too large to mount safely on this system");
4775 return err;
4776 }
4777
4778 /* check blocks count against device size */
4779 blocks_count = sb_bdev_nr_blocks(sb);
4780 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
4781 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
4782 "exceeds size of device (%llu blocks)",
4783 ext4_blocks_count(es), blocks_count);
4784 return -EINVAL;
4785 }
4786
4787 /*
4788 * It makes no sense for the first data block to be beyond the end
4789 * of the filesystem.
4790 */
4791 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
4792 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4793 "block %u is beyond end of filesystem (%llu)",
4794 le32_to_cpu(es->s_first_data_block),
4795 ext4_blocks_count(es));
4796 return -EINVAL;
4797 }
4798 if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) &&
4799 (sbi->s_cluster_ratio == 1)) {
4800 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4801 "block is 0 with a 1k block and cluster size");
4802 return -EINVAL;
4803 }
4804
4805 blocks_count = (ext4_blocks_count(es) -
4806 le32_to_cpu(es->s_first_data_block) +
4807 EXT4_BLOCKS_PER_GROUP(sb) - 1);
4808 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4809 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
4810 ext4_msg(sb, KERN_WARNING, "groups count too large: %llu "
4811 "(block count %llu, first data block %u, "
4812 "blocks per group %lu)", blocks_count,
4813 ext4_blocks_count(es),
4814 le32_to_cpu(es->s_first_data_block),
4815 EXT4_BLOCKS_PER_GROUP(sb));
4816 return -EINVAL;
4817 }
4818 sbi->s_groups_count = blocks_count;
4819 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
4820 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
4821 if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) !=
4822 le32_to_cpu(es->s_inodes_count)) {
4823 ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu",
4824 le32_to_cpu(es->s_inodes_count),
4825 ((u64)sbi->s_groups_count * sbi->s_inodes_per_group));
4826 return -EINVAL;
4827 }
4828
4829 return 0;
4830}
4831
4832static int ext4_group_desc_init(struct super_block *sb,
4833 struct ext4_super_block *es,
4834 ext4_fsblk_t logical_sb_block,
4835 ext4_group_t *first_not_zeroed)
4836{
4837 struct ext4_sb_info *sbi = EXT4_SB(sb);
4838 unsigned int db_count;
4839 ext4_fsblk_t block;
4840 int i;
4841
4842 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
4843 EXT4_DESC_PER_BLOCK(sb);
4844 if (ext4_has_feature_meta_bg(sb)) {
4845 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
4846 ext4_msg(sb, KERN_WARNING,
4847 "first meta block group too large: %u "
4848 "(group descriptor block count %u)",
4849 le32_to_cpu(es->s_first_meta_bg), db_count);
4850 return -EINVAL;
4851 }
4852 }
4853 rcu_assign_pointer(sbi->s_group_desc,
4854 kvmalloc_array(db_count,
4855 sizeof(struct buffer_head *),
4856 GFP_KERNEL));
4857 if (sbi->s_group_desc == NULL) {
4858 ext4_msg(sb, KERN_ERR, "not enough memory");
4859 return -ENOMEM;
4860 }
4861
4862 bgl_lock_init(sbi->s_blockgroup_lock);
4863
4864 /* Pre-read the descriptors into the buffer cache */
4865 for (i = 0; i < db_count; i++) {
4866 block = descriptor_loc(sb, logical_sb_block, i);
4867 ext4_sb_breadahead_unmovable(sb, block);
4868 }
4869
4870 for (i = 0; i < db_count; i++) {
4871 struct buffer_head *bh;
4872
4873 block = descriptor_loc(sb, logical_sb_block, i);
4874 bh = ext4_sb_bread_unmovable(sb, block);
4875 if (IS_ERR(bh)) {
4876 ext4_msg(sb, KERN_ERR,
4877 "can't read group descriptor %d", i);
4878 sbi->s_gdb_count = i;
4879 return PTR_ERR(bh);
4880 }
4881 rcu_read_lock();
4882 rcu_dereference(sbi->s_group_desc)[i] = bh;
4883 rcu_read_unlock();
4884 }
4885 sbi->s_gdb_count = db_count;
4886 if (!ext4_check_descriptors(sb, logical_sb_block, first_not_zeroed)) {
4887 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
4888 return -EFSCORRUPTED;
4889 }
4890
4891 return 0;
4892}
4893
4894static int ext4_load_and_init_journal(struct super_block *sb,
4895 struct ext4_super_block *es,
4896 struct ext4_fs_context *ctx)
4897{
4898 struct ext4_sb_info *sbi = EXT4_SB(sb);
4899 int err;
4900
4901 err = ext4_load_journal(sb, es, ctx->journal_devnum);
4902 if (err)
4903 return err;
4904
4905 if (ext4_has_feature_64bit(sb) &&
4906 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4907 JBD2_FEATURE_INCOMPAT_64BIT)) {
4908 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
4909 goto out;
4910 }
4911
4912 if (!set_journal_csum_feature_set(sb)) {
4913 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4914 "feature set");
4915 goto out;
4916 }
4917
4918 if (test_opt2(sb, JOURNAL_FAST_COMMIT) &&
4919 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4920 JBD2_FEATURE_INCOMPAT_FAST_COMMIT)) {
4921 ext4_msg(sb, KERN_ERR,
4922 "Failed to set fast commit journal feature");
4923 goto out;
4924 }
4925
4926 /* We have now updated the journal if required, so we can
4927 * validate the data journaling mode. */
4928 switch (test_opt(sb, DATA_FLAGS)) {
4929 case 0:
4930 /* No mode set, assume a default based on the journal
4931 * capabilities: ORDERED_DATA if the journal can
4932 * cope, else JOURNAL_DATA
4933 */
4934 if (jbd2_journal_check_available_features
4935 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4936 set_opt(sb, ORDERED_DATA);
4937 sbi->s_def_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
4938 } else {
4939 set_opt(sb, JOURNAL_DATA);
4940 sbi->s_def_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
4941 }
4942 break;
4943
4944 case EXT4_MOUNT_ORDERED_DATA:
4945 case EXT4_MOUNT_WRITEBACK_DATA:
4946 if (!jbd2_journal_check_available_features
4947 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4948 ext4_msg(sb, KERN_ERR, "Journal does not support "
4949 "requested data journaling mode");
4950 goto out;
4951 }
4952 break;
4953 default:
4954 break;
4955 }
4956
4957 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4958 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4959 ext4_msg(sb, KERN_ERR, "can't mount with "
4960 "journal_async_commit in data=ordered mode");
4961 goto out;
4962 }
4963
4964 set_task_ioprio(sbi->s_journal->j_task, ctx->journal_ioprio);
4965
4966 sbi->s_journal->j_submit_inode_data_buffers =
4967 ext4_journal_submit_inode_data_buffers;
4968 sbi->s_journal->j_finish_inode_data_buffers =
4969 ext4_journal_finish_inode_data_buffers;
4970
4971 return 0;
4972
4973out:
4974 /* flush s_sb_upd_work before destroying the journal. */
4975 flush_work(&sbi->s_sb_upd_work);
4976 jbd2_journal_destroy(sbi->s_journal);
4977 sbi->s_journal = NULL;
4978 return -EINVAL;
4979}
4980
4981static int ext4_check_journal_data_mode(struct super_block *sb)
4982{
4983 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4984 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting with "
4985 "data=journal disables delayed allocation, "
4986 "dioread_nolock, O_DIRECT and fast_commit support!\n");
4987 /* can't mount with both data=journal and dioread_nolock. */
4988 clear_opt(sb, DIOREAD_NOLOCK);
4989 clear_opt2(sb, JOURNAL_FAST_COMMIT);
4990 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4991 ext4_msg(sb, KERN_ERR, "can't mount with "
4992 "both data=journal and delalloc");
4993 return -EINVAL;
4994 }
4995 if (test_opt(sb, DAX_ALWAYS)) {
4996 ext4_msg(sb, KERN_ERR, "can't mount with "
4997 "both data=journal and dax");
4998 return -EINVAL;
4999 }
5000 if (ext4_has_feature_encrypt(sb)) {
5001 ext4_msg(sb, KERN_WARNING,
5002 "encrypted files will use data=ordered "
5003 "instead of data journaling mode");
5004 }
5005 if (test_opt(sb, DELALLOC))
5006 clear_opt(sb, DELALLOC);
5007 } else {
5008 sb->s_iflags |= SB_I_CGROUPWB;
5009 }
5010
5011 return 0;
5012}
5013
5014static int ext4_load_super(struct super_block *sb, ext4_fsblk_t *lsb,
5015 int silent)
5016{
5017 struct ext4_sb_info *sbi = EXT4_SB(sb);
5018 struct ext4_super_block *es;
5019 ext4_fsblk_t logical_sb_block;
5020 unsigned long offset = 0;
5021 struct buffer_head *bh;
5022 int ret = -EINVAL;
5023 int blocksize;
5024
5025 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
5026 if (!blocksize) {
5027 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
5028 return -EINVAL;
5029 }
5030
5031 /*
5032 * The ext4 superblock will not be buffer aligned for other than 1kB
5033 * block sizes. We need to calculate the offset from buffer start.
5034 */
5035 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
5036 logical_sb_block = sbi->s_sb_block * EXT4_MIN_BLOCK_SIZE;
5037 offset = do_div(logical_sb_block, blocksize);
5038 } else {
5039 logical_sb_block = sbi->s_sb_block;
5040 }
5041
5042 bh = ext4_sb_bread_unmovable(sb, logical_sb_block);
5043 if (IS_ERR(bh)) {
5044 ext4_msg(sb, KERN_ERR, "unable to read superblock");
5045 return PTR_ERR(bh);
5046 }
5047 /*
5048 * Note: s_es must be initialized as soon as possible because
5049 * some ext4 macro-instructions depend on its value
5050 */
5051 es = (struct ext4_super_block *) (bh->b_data + offset);
5052 sbi->s_es = es;
5053 sb->s_magic = le16_to_cpu(es->s_magic);
5054 if (sb->s_magic != EXT4_SUPER_MAGIC) {
5055 if (!silent)
5056 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
5057 goto out;
5058 }
5059
5060 if (le32_to_cpu(es->s_log_block_size) >
5061 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
5062 ext4_msg(sb, KERN_ERR,
5063 "Invalid log block size: %u",
5064 le32_to_cpu(es->s_log_block_size));
5065 goto out;
5066 }
5067 if (le32_to_cpu(es->s_log_cluster_size) >
5068 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
5069 ext4_msg(sb, KERN_ERR,
5070 "Invalid log cluster size: %u",
5071 le32_to_cpu(es->s_log_cluster_size));
5072 goto out;
5073 }
5074
5075 blocksize = EXT4_MIN_BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
5076
5077 /*
5078 * If the default block size is not the same as the real block size,
5079 * we need to reload it.
5080 */
5081 if (sb->s_blocksize == blocksize) {
5082 *lsb = logical_sb_block;
5083 sbi->s_sbh = bh;
5084 return 0;
5085 }
5086
5087 /*
5088 * bh must be released before kill_bdev(), otherwise
5089 * it won't be freed and its page also. kill_bdev()
5090 * is called by sb_set_blocksize().
5091 */
5092 brelse(bh);
5093 /* Validate the filesystem blocksize */
5094 if (!sb_set_blocksize(sb, blocksize)) {
5095 ext4_msg(sb, KERN_ERR, "bad block size %d",
5096 blocksize);
5097 bh = NULL;
5098 goto out;
5099 }
5100
5101 logical_sb_block = sbi->s_sb_block * EXT4_MIN_BLOCK_SIZE;
5102 offset = do_div(logical_sb_block, blocksize);
5103 bh = ext4_sb_bread_unmovable(sb, logical_sb_block);
5104 if (IS_ERR(bh)) {
5105 ext4_msg(sb, KERN_ERR, "Can't read superblock on 2nd try");
5106 ret = PTR_ERR(bh);
5107 bh = NULL;
5108 goto out;
5109 }
5110 es = (struct ext4_super_block *)(bh->b_data + offset);
5111 sbi->s_es = es;
5112 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
5113 ext4_msg(sb, KERN_ERR, "Magic mismatch, very weird!");
5114 goto out;
5115 }
5116 *lsb = logical_sb_block;
5117 sbi->s_sbh = bh;
5118 return 0;
5119out:
5120 brelse(bh);
5121 return ret;
5122}
5123
5124static void ext4_hash_info_init(struct super_block *sb)
5125{
5126 struct ext4_sb_info *sbi = EXT4_SB(sb);
5127 struct ext4_super_block *es = sbi->s_es;
5128 unsigned int i;
5129
5130 for (i = 0; i < 4; i++)
5131 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
5132
5133 sbi->s_def_hash_version = es->s_def_hash_version;
5134 if (ext4_has_feature_dir_index(sb)) {
5135 i = le32_to_cpu(es->s_flags);
5136 if (i & EXT2_FLAGS_UNSIGNED_HASH)
5137 sbi->s_hash_unsigned = 3;
5138 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
5139#ifdef __CHAR_UNSIGNED__
5140 if (!sb_rdonly(sb))
5141 es->s_flags |=
5142 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
5143 sbi->s_hash_unsigned = 3;
5144#else
5145 if (!sb_rdonly(sb))
5146 es->s_flags |=
5147 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
5148#endif
5149 }
5150 }
5151}
5152
5153static int ext4_block_group_meta_init(struct super_block *sb, int silent)
5154{
5155 struct ext4_sb_info *sbi = EXT4_SB(sb);
5156 struct ext4_super_block *es = sbi->s_es;
5157 int has_huge_files;
5158
5159 has_huge_files = ext4_has_feature_huge_file(sb);
5160 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
5161 has_huge_files);
5162 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
5163
5164 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
5165 if (ext4_has_feature_64bit(sb)) {
5166 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
5167 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
5168 !is_power_of_2(sbi->s_desc_size)) {
5169 ext4_msg(sb, KERN_ERR,
5170 "unsupported descriptor size %lu",
5171 sbi->s_desc_size);
5172 return -EINVAL;
5173 }
5174 } else
5175 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
5176
5177 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
5178 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
5179
5180 sbi->s_inodes_per_block = sb->s_blocksize / EXT4_INODE_SIZE(sb);
5181 if (sbi->s_inodes_per_block == 0 || sbi->s_blocks_per_group == 0) {
5182 if (!silent)
5183 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
5184 return -EINVAL;
5185 }
5186 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
5187 sbi->s_inodes_per_group > sb->s_blocksize * 8) {
5188 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
5189 sbi->s_inodes_per_group);
5190 return -EINVAL;
5191 }
5192 sbi->s_itb_per_group = sbi->s_inodes_per_group /
5193 sbi->s_inodes_per_block;
5194 sbi->s_desc_per_block = sb->s_blocksize / EXT4_DESC_SIZE(sb);
5195 sbi->s_mount_state = le16_to_cpu(es->s_state) & ~EXT4_FC_REPLAY;
5196 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
5197 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
5198
5199 return 0;
5200}
5201
5202static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
5203{
5204 struct ext4_super_block *es = NULL;
5205 struct ext4_sb_info *sbi = EXT4_SB(sb);
5206 ext4_fsblk_t logical_sb_block;
5207 struct inode *root;
5208 int needs_recovery;
5209 int err;
5210 ext4_group_t first_not_zeroed;
5211 struct ext4_fs_context *ctx = fc->fs_private;
5212 int silent = fc->sb_flags & SB_SILENT;
5213
5214 /* Set defaults for the variables that will be set during parsing */
5215 if (!(ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO))
5216 ctx->journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
5217
5218 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
5219 sbi->s_sectors_written_start =
5220 part_stat_read(sb->s_bdev, sectors[STAT_WRITE]);
5221
5222 err = ext4_load_super(sb, &logical_sb_block, silent);
5223 if (err)
5224 goto out_fail;
5225
5226 es = sbi->s_es;
5227 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
5228
5229 err = ext4_init_metadata_csum(sb, es);
5230 if (err)
5231 goto failed_mount;
5232
5233 ext4_set_def_opts(sb, es);
5234
5235 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
5236 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
5237 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
5238 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
5239 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
5240
5241 /*
5242 * set default s_li_wait_mult for lazyinit, for the case there is
5243 * no mount option specified.
5244 */
5245 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
5246
5247 err = ext4_inode_info_init(sb, es);
5248 if (err)
5249 goto failed_mount;
5250
5251 err = parse_apply_sb_mount_options(sb, ctx);
5252 if (err < 0)
5253 goto failed_mount;
5254
5255 sbi->s_def_mount_opt = sbi->s_mount_opt;
5256 sbi->s_def_mount_opt2 = sbi->s_mount_opt2;
5257
5258 err = ext4_check_opt_consistency(fc, sb);
5259 if (err < 0)
5260 goto failed_mount;
5261
5262 ext4_apply_options(fc, sb);
5263
5264 err = ext4_encoding_init(sb, es);
5265 if (err)
5266 goto failed_mount;
5267
5268 err = ext4_check_journal_data_mode(sb);
5269 if (err)
5270 goto failed_mount;
5271
5272 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
5273 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
5274
5275 /* i_version is always enabled now */
5276 sb->s_flags |= SB_I_VERSION;
5277
5278 err = ext4_check_feature_compatibility(sb, es, silent);
5279 if (err)
5280 goto failed_mount;
5281
5282 err = ext4_block_group_meta_init(sb, silent);
5283 if (err)
5284 goto failed_mount;
5285
5286 ext4_hash_info_init(sb);
5287
5288 err = ext4_handle_clustersize(sb);
5289 if (err)
5290 goto failed_mount;
5291
5292 err = ext4_check_geometry(sb, es);
5293 if (err)
5294 goto failed_mount;
5295
5296 timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
5297 spin_lock_init(&sbi->s_error_lock);
5298 INIT_WORK(&sbi->s_sb_upd_work, update_super_work);
5299
5300 err = ext4_group_desc_init(sb, es, logical_sb_block, &first_not_zeroed);
5301 if (err)
5302 goto failed_mount3;
5303
5304 err = ext4_es_register_shrinker(sbi);
5305 if (err)
5306 goto failed_mount3;
5307
5308 sbi->s_stripe = ext4_get_stripe_size(sbi);
5309 /*
5310 * It's hard to get stripe aligned blocks if stripe is not aligned with
5311 * cluster, just disable stripe and alert user to simpfy code and avoid
5312 * stripe aligned allocation which will rarely successes.
5313 */
5314 if (sbi->s_stripe > 0 && sbi->s_cluster_ratio > 1 &&
5315 sbi->s_stripe % sbi->s_cluster_ratio != 0) {
5316 ext4_msg(sb, KERN_WARNING,
5317 "stripe (%lu) is not aligned with cluster size (%u), "
5318 "stripe is disabled",
5319 sbi->s_stripe, sbi->s_cluster_ratio);
5320 sbi->s_stripe = 0;
5321 }
5322 sbi->s_extent_max_zeroout_kb = 32;
5323
5324 /*
5325 * set up enough so that it can read an inode
5326 */
5327 sb->s_op = &ext4_sops;
5328 sb->s_export_op = &ext4_export_ops;
5329 sb->s_xattr = ext4_xattr_handlers;
5330#ifdef CONFIG_FS_ENCRYPTION
5331 sb->s_cop = &ext4_cryptops;
5332#endif
5333#ifdef CONFIG_FS_VERITY
5334 sb->s_vop = &ext4_verityops;
5335#endif
5336#ifdef CONFIG_QUOTA
5337 sb->dq_op = &ext4_quota_operations;
5338 if (ext4_has_feature_quota(sb))
5339 sb->s_qcop = &dquot_quotactl_sysfile_ops;
5340 else
5341 sb->s_qcop = &ext4_qctl_operations;
5342 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
5343#endif
5344 super_set_uuid(sb, es->s_uuid, sizeof(es->s_uuid));
5345
5346 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
5347 mutex_init(&sbi->s_orphan_lock);
5348
5349 ext4_fast_commit_init(sb);
5350
5351 sb->s_root = NULL;
5352
5353 needs_recovery = (es->s_last_orphan != 0 ||
5354 ext4_has_feature_orphan_present(sb) ||
5355 ext4_has_feature_journal_needs_recovery(sb));
5356
5357 if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb)) {
5358 err = ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block));
5359 if (err)
5360 goto failed_mount3a;
5361 }
5362
5363 err = -EINVAL;
5364 /*
5365 * The first inode we look at is the journal inode. Don't try
5366 * root first: it may be modified in the journal!
5367 */
5368 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
5369 err = ext4_load_and_init_journal(sb, es, ctx);
5370 if (err)
5371 goto failed_mount3a;
5372 } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&
5373 ext4_has_feature_journal_needs_recovery(sb)) {
5374 ext4_msg(sb, KERN_ERR, "required journal recovery "
5375 "suppressed and not mounted read-only");
5376 goto failed_mount3a;
5377 } else {
5378 /* Nojournal mode, all journal mount options are illegal */
5379 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
5380 ext4_msg(sb, KERN_ERR, "can't mount with "
5381 "journal_async_commit, fs mounted w/o journal");
5382 goto failed_mount3a;
5383 }
5384
5385 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
5386 ext4_msg(sb, KERN_ERR, "can't mount with "
5387 "journal_checksum, fs mounted w/o journal");
5388 goto failed_mount3a;
5389 }
5390 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
5391 ext4_msg(sb, KERN_ERR, "can't mount with "
5392 "commit=%lu, fs mounted w/o journal",
5393 sbi->s_commit_interval / HZ);
5394 goto failed_mount3a;
5395 }
5396 if (EXT4_MOUNT_DATA_FLAGS &
5397 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
5398 ext4_msg(sb, KERN_ERR, "can't mount with "
5399 "data=, fs mounted w/o journal");
5400 goto failed_mount3a;
5401 }
5402 sbi->s_def_mount_opt &= ~EXT4_MOUNT_JOURNAL_CHECKSUM;
5403 clear_opt(sb, JOURNAL_CHECKSUM);
5404 clear_opt(sb, DATA_FLAGS);
5405 clear_opt2(sb, JOURNAL_FAST_COMMIT);
5406 sbi->s_journal = NULL;
5407 needs_recovery = 0;
5408 }
5409
5410 if (!test_opt(sb, NO_MBCACHE)) {
5411 sbi->s_ea_block_cache = ext4_xattr_create_cache();
5412 if (!sbi->s_ea_block_cache) {
5413 ext4_msg(sb, KERN_ERR,
5414 "Failed to create ea_block_cache");
5415 err = -EINVAL;
5416 goto failed_mount_wq;
5417 }
5418
5419 if (ext4_has_feature_ea_inode(sb)) {
5420 sbi->s_ea_inode_cache = ext4_xattr_create_cache();
5421 if (!sbi->s_ea_inode_cache) {
5422 ext4_msg(sb, KERN_ERR,
5423 "Failed to create ea_inode_cache");
5424 err = -EINVAL;
5425 goto failed_mount_wq;
5426 }
5427 }
5428 }
5429
5430 /*
5431 * Get the # of file system overhead blocks from the
5432 * superblock if present.
5433 */
5434 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
5435 /* ignore the precalculated value if it is ridiculous */
5436 if (sbi->s_overhead > ext4_blocks_count(es))
5437 sbi->s_overhead = 0;
5438 /*
5439 * If the bigalloc feature is not enabled recalculating the
5440 * overhead doesn't take long, so we might as well just redo
5441 * it to make sure we are using the correct value.
5442 */
5443 if (!ext4_has_feature_bigalloc(sb))
5444 sbi->s_overhead = 0;
5445 if (sbi->s_overhead == 0) {
5446 err = ext4_calculate_overhead(sb);
5447 if (err)
5448 goto failed_mount_wq;
5449 }
5450
5451 /*
5452 * The maximum number of concurrent works can be high and
5453 * concurrency isn't really necessary. Limit it to 1.
5454 */
5455 EXT4_SB(sb)->rsv_conversion_wq =
5456 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
5457 if (!EXT4_SB(sb)->rsv_conversion_wq) {
5458 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
5459 err = -ENOMEM;
5460 goto failed_mount4;
5461 }
5462
5463 /*
5464 * The jbd2_journal_load will have done any necessary log recovery,
5465 * so we can safely mount the rest of the filesystem now.
5466 */
5467
5468 root = ext4_iget(sb, EXT4_ROOT_INO, EXT4_IGET_SPECIAL);
5469 if (IS_ERR(root)) {
5470 ext4_msg(sb, KERN_ERR, "get root inode failed");
5471 err = PTR_ERR(root);
5472 root = NULL;
5473 goto failed_mount4;
5474 }
5475 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
5476 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
5477 iput(root);
5478 err = -EFSCORRUPTED;
5479 goto failed_mount4;
5480 }
5481
5482 generic_set_sb_d_ops(sb);
5483 sb->s_root = d_make_root(root);
5484 if (!sb->s_root) {
5485 ext4_msg(sb, KERN_ERR, "get root dentry failed");
5486 err = -ENOMEM;
5487 goto failed_mount4;
5488 }
5489
5490 err = ext4_setup_super(sb, es, sb_rdonly(sb));
5491 if (err == -EROFS) {
5492 sb->s_flags |= SB_RDONLY;
5493 } else if (err)
5494 goto failed_mount4a;
5495
5496 ext4_set_resv_clusters(sb);
5497
5498 if (test_opt(sb, BLOCK_VALIDITY)) {
5499 err = ext4_setup_system_zone(sb);
5500 if (err) {
5501 ext4_msg(sb, KERN_ERR, "failed to initialize system "
5502 "zone (%d)", err);
5503 goto failed_mount4a;
5504 }
5505 }
5506 ext4_fc_replay_cleanup(sb);
5507
5508 ext4_ext_init(sb);
5509
5510 /*
5511 * Enable optimize_scan if number of groups is > threshold. This can be
5512 * turned off by passing "mb_optimize_scan=0". This can also be
5513 * turned on forcefully by passing "mb_optimize_scan=1".
5514 */
5515 if (!(ctx->spec & EXT4_SPEC_mb_optimize_scan)) {
5516 if (sbi->s_groups_count >= MB_DEFAULT_LINEAR_SCAN_THRESHOLD)
5517 set_opt2(sb, MB_OPTIMIZE_SCAN);
5518 else
5519 clear_opt2(sb, MB_OPTIMIZE_SCAN);
5520 }
5521
5522 err = ext4_mb_init(sb);
5523 if (err) {
5524 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
5525 err);
5526 goto failed_mount5;
5527 }
5528
5529 /*
5530 * We can only set up the journal commit callback once
5531 * mballoc is initialized
5532 */
5533 if (sbi->s_journal)
5534 sbi->s_journal->j_commit_callback =
5535 ext4_journal_commit_callback;
5536
5537 err = ext4_percpu_param_init(sbi);
5538 if (err)
5539 goto failed_mount6;
5540
5541 if (ext4_has_feature_flex_bg(sb))
5542 if (!ext4_fill_flex_info(sb)) {
5543 ext4_msg(sb, KERN_ERR,
5544 "unable to initialize "
5545 "flex_bg meta info!");
5546 err = -ENOMEM;
5547 goto failed_mount6;
5548 }
5549
5550 err = ext4_register_li_request(sb, first_not_zeroed);
5551 if (err)
5552 goto failed_mount6;
5553
5554 err = ext4_register_sysfs(sb);
5555 if (err)
5556 goto failed_mount7;
5557
5558 err = ext4_init_orphan_info(sb);
5559 if (err)
5560 goto failed_mount8;
5561#ifdef CONFIG_QUOTA
5562 /* Enable quota usage during mount. */
5563 if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
5564 err = ext4_enable_quotas(sb);
5565 if (err)
5566 goto failed_mount9;
5567 }
5568#endif /* CONFIG_QUOTA */
5569
5570 /*
5571 * Save the original bdev mapping's wb_err value which could be
5572 * used to detect the metadata async write error.
5573 */
5574 spin_lock_init(&sbi->s_bdev_wb_lock);
5575 errseq_check_and_advance(&sb->s_bdev->bd_inode->i_mapping->wb_err,
5576 &sbi->s_bdev_wb_err);
5577 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
5578 ext4_orphan_cleanup(sb, es);
5579 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
5580 /*
5581 * Update the checksum after updating free space/inode counters and
5582 * ext4_orphan_cleanup. Otherwise the superblock can have an incorrect
5583 * checksum in the buffer cache until it is written out and
5584 * e2fsprogs programs trying to open a file system immediately
5585 * after it is mounted can fail.
5586 */
5587 ext4_superblock_csum_set(sb);
5588 if (needs_recovery) {
5589 ext4_msg(sb, KERN_INFO, "recovery complete");
5590 err = ext4_mark_recovery_complete(sb, es);
5591 if (err)
5592 goto failed_mount10;
5593 }
5594
5595 if (test_opt(sb, DISCARD) && !bdev_max_discard_sectors(sb->s_bdev))
5596 ext4_msg(sb, KERN_WARNING,
5597 "mounting with \"discard\" option, but the device does not support discard");
5598
5599 if (es->s_error_count)
5600 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
5601
5602 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
5603 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
5604 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
5605 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
5606 atomic_set(&sbi->s_warning_count, 0);
5607 atomic_set(&sbi->s_msg_count, 0);
5608
5609 return 0;
5610
5611failed_mount10:
5612 ext4_quotas_off(sb, EXT4_MAXQUOTAS);
5613failed_mount9: __maybe_unused
5614 ext4_release_orphan_info(sb);
5615failed_mount8:
5616 ext4_unregister_sysfs(sb);
5617 kobject_put(&sbi->s_kobj);
5618failed_mount7:
5619 ext4_unregister_li_request(sb);
5620failed_mount6:
5621 ext4_mb_release(sb);
5622 ext4_flex_groups_free(sbi);
5623 ext4_percpu_param_destroy(sbi);
5624failed_mount5:
5625 ext4_ext_release(sb);
5626 ext4_release_system_zone(sb);
5627failed_mount4a:
5628 dput(sb->s_root);
5629 sb->s_root = NULL;
5630failed_mount4:
5631 ext4_msg(sb, KERN_ERR, "mount failed");
5632 if (EXT4_SB(sb)->rsv_conversion_wq)
5633 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
5634failed_mount_wq:
5635 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
5636 sbi->s_ea_inode_cache = NULL;
5637
5638 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
5639 sbi->s_ea_block_cache = NULL;
5640
5641 if (sbi->s_journal) {
5642 /* flush s_sb_upd_work before journal destroy. */
5643 flush_work(&sbi->s_sb_upd_work);
5644 jbd2_journal_destroy(sbi->s_journal);
5645 sbi->s_journal = NULL;
5646 }
5647failed_mount3a:
5648 ext4_es_unregister_shrinker(sbi);
5649failed_mount3:
5650 /* flush s_sb_upd_work before sbi destroy */
5651 flush_work(&sbi->s_sb_upd_work);
5652 del_timer_sync(&sbi->s_err_report);
5653 ext4_stop_mmpd(sbi);
5654 ext4_group_desc_free(sbi);
5655failed_mount:
5656 if (sbi->s_chksum_driver)
5657 crypto_free_shash(sbi->s_chksum_driver);
5658
5659#if IS_ENABLED(CONFIG_UNICODE)
5660 utf8_unload(sb->s_encoding);
5661#endif
5662
5663#ifdef CONFIG_QUOTA
5664 for (unsigned int i = 0; i < EXT4_MAXQUOTAS; i++)
5665 kfree(get_qf_name(sb, sbi, i));
5666#endif
5667 fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy);
5668 brelse(sbi->s_sbh);
5669 if (sbi->s_journal_bdev_file) {
5670 invalidate_bdev(file_bdev(sbi->s_journal_bdev_file));
5671 bdev_fput(sbi->s_journal_bdev_file);
5672 }
5673out_fail:
5674 invalidate_bdev(sb->s_bdev);
5675 sb->s_fs_info = NULL;
5676 return err;
5677}
5678
5679static int ext4_fill_super(struct super_block *sb, struct fs_context *fc)
5680{
5681 struct ext4_fs_context *ctx = fc->fs_private;
5682 struct ext4_sb_info *sbi;
5683 const char *descr;
5684 int ret;
5685
5686 sbi = ext4_alloc_sbi(sb);
5687 if (!sbi)
5688 return -ENOMEM;
5689
5690 fc->s_fs_info = sbi;
5691
5692 /* Cleanup superblock name */
5693 strreplace(sb->s_id, '/', '!');
5694
5695 sbi->s_sb_block = 1; /* Default super block location */
5696 if (ctx->spec & EXT4_SPEC_s_sb_block)
5697 sbi->s_sb_block = ctx->s_sb_block;
5698
5699 ret = __ext4_fill_super(fc, sb);
5700 if (ret < 0)
5701 goto free_sbi;
5702
5703 if (sbi->s_journal) {
5704 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
5705 descr = " journalled data mode";
5706 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
5707 descr = " ordered data mode";
5708 else
5709 descr = " writeback data mode";
5710 } else
5711 descr = "out journal";
5712
5713 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
5714 ext4_msg(sb, KERN_INFO, "mounted filesystem %pU %s with%s. "
5715 "Quota mode: %s.", &sb->s_uuid,
5716 sb_rdonly(sb) ? "ro" : "r/w", descr,
5717 ext4_quota_mode(sb));
5718
5719 /* Update the s_overhead_clusters if necessary */
5720 ext4_update_overhead(sb, false);
5721 return 0;
5722
5723free_sbi:
5724 ext4_free_sbi(sbi);
5725 fc->s_fs_info = NULL;
5726 return ret;
5727}
5728
5729static int ext4_get_tree(struct fs_context *fc)
5730{
5731 return get_tree_bdev(fc, ext4_fill_super);
5732}
5733
5734/*
5735 * Setup any per-fs journal parameters now. We'll do this both on
5736 * initial mount, once the journal has been initialised but before we've
5737 * done any recovery; and again on any subsequent remount.
5738 */
5739static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
5740{
5741 struct ext4_sb_info *sbi = EXT4_SB(sb);
5742
5743 journal->j_commit_interval = sbi->s_commit_interval;
5744 journal->j_min_batch_time = sbi->s_min_batch_time;
5745 journal->j_max_batch_time = sbi->s_max_batch_time;
5746 ext4_fc_init(sb, journal);
5747
5748 write_lock(&journal->j_state_lock);
5749 if (test_opt(sb, BARRIER))
5750 journal->j_flags |= JBD2_BARRIER;
5751 else
5752 journal->j_flags &= ~JBD2_BARRIER;
5753 if (test_opt(sb, DATA_ERR_ABORT))
5754 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
5755 else
5756 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
5757 /*
5758 * Always enable journal cycle record option, letting the journal
5759 * records log transactions continuously between each mount.
5760 */
5761 journal->j_flags |= JBD2_CYCLE_RECORD;
5762 write_unlock(&journal->j_state_lock);
5763}
5764
5765static struct inode *ext4_get_journal_inode(struct super_block *sb,
5766 unsigned int journal_inum)
5767{
5768 struct inode *journal_inode;
5769
5770 /*
5771 * Test for the existence of a valid inode on disk. Bad things
5772 * happen if we iget() an unused inode, as the subsequent iput()
5773 * will try to delete it.
5774 */
5775 journal_inode = ext4_iget(sb, journal_inum, EXT4_IGET_SPECIAL);
5776 if (IS_ERR(journal_inode)) {
5777 ext4_msg(sb, KERN_ERR, "no journal found");
5778 return ERR_CAST(journal_inode);
5779 }
5780 if (!journal_inode->i_nlink) {
5781 make_bad_inode(journal_inode);
5782 iput(journal_inode);
5783 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
5784 return ERR_PTR(-EFSCORRUPTED);
5785 }
5786 if (!S_ISREG(journal_inode->i_mode) || IS_ENCRYPTED(journal_inode)) {
5787 ext4_msg(sb, KERN_ERR, "invalid journal inode");
5788 iput(journal_inode);
5789 return ERR_PTR(-EFSCORRUPTED);
5790 }
5791
5792 ext4_debug("Journal inode found at %p: %lld bytes\n",
5793 journal_inode, journal_inode->i_size);
5794 return journal_inode;
5795}
5796
5797static int ext4_journal_bmap(journal_t *journal, sector_t *block)
5798{
5799 struct ext4_map_blocks map;
5800 int ret;
5801
5802 if (journal->j_inode == NULL)
5803 return 0;
5804
5805 map.m_lblk = *block;
5806 map.m_len = 1;
5807 ret = ext4_map_blocks(NULL, journal->j_inode, &map, 0);
5808 if (ret <= 0) {
5809 ext4_msg(journal->j_inode->i_sb, KERN_CRIT,
5810 "journal bmap failed: block %llu ret %d\n",
5811 *block, ret);
5812 jbd2_journal_abort(journal, ret ? ret : -EIO);
5813 return ret;
5814 }
5815 *block = map.m_pblk;
5816 return 0;
5817}
5818
5819static journal_t *ext4_open_inode_journal(struct super_block *sb,
5820 unsigned int journal_inum)
5821{
5822 struct inode *journal_inode;
5823 journal_t *journal;
5824
5825 journal_inode = ext4_get_journal_inode(sb, journal_inum);
5826 if (IS_ERR(journal_inode))
5827 return ERR_CAST(journal_inode);
5828
5829 journal = jbd2_journal_init_inode(journal_inode);
5830 if (IS_ERR(journal)) {
5831 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
5832 iput(journal_inode);
5833 return ERR_CAST(journal);
5834 }
5835 journal->j_private = sb;
5836 journal->j_bmap = ext4_journal_bmap;
5837 ext4_init_journal_params(sb, journal);
5838 return journal;
5839}
5840
5841static struct file *ext4_get_journal_blkdev(struct super_block *sb,
5842 dev_t j_dev, ext4_fsblk_t *j_start,
5843 ext4_fsblk_t *j_len)
5844{
5845 struct buffer_head *bh;
5846 struct block_device *bdev;
5847 struct file *bdev_file;
5848 int hblock, blocksize;
5849 ext4_fsblk_t sb_block;
5850 unsigned long offset;
5851 struct ext4_super_block *es;
5852 int errno;
5853
5854 bdev_file = bdev_file_open_by_dev(j_dev,
5855 BLK_OPEN_READ | BLK_OPEN_WRITE | BLK_OPEN_RESTRICT_WRITES,
5856 sb, &fs_holder_ops);
5857 if (IS_ERR(bdev_file)) {
5858 ext4_msg(sb, KERN_ERR,
5859 "failed to open journal device unknown-block(%u,%u) %ld",
5860 MAJOR(j_dev), MINOR(j_dev), PTR_ERR(bdev_file));
5861 return bdev_file;
5862 }
5863
5864 bdev = file_bdev(bdev_file);
5865 blocksize = sb->s_blocksize;
5866 hblock = bdev_logical_block_size(bdev);
5867 if (blocksize < hblock) {
5868 ext4_msg(sb, KERN_ERR,
5869 "blocksize too small for journal device");
5870 errno = -EINVAL;
5871 goto out_bdev;
5872 }
5873
5874 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
5875 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
5876 set_blocksize(bdev, blocksize);
5877 bh = __bread(bdev, sb_block, blocksize);
5878 if (!bh) {
5879 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
5880 "external journal");
5881 errno = -EINVAL;
5882 goto out_bdev;
5883 }
5884
5885 es = (struct ext4_super_block *) (bh->b_data + offset);
5886 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
5887 !(le32_to_cpu(es->s_feature_incompat) &
5888 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
5889 ext4_msg(sb, KERN_ERR, "external journal has bad superblock");
5890 errno = -EFSCORRUPTED;
5891 goto out_bh;
5892 }
5893
5894 if ((le32_to_cpu(es->s_feature_ro_compat) &
5895 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
5896 es->s_checksum != ext4_superblock_csum(sb, es)) {
5897 ext4_msg(sb, KERN_ERR, "external journal has corrupt superblock");
5898 errno = -EFSCORRUPTED;
5899 goto out_bh;
5900 }
5901
5902 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
5903 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
5904 errno = -EFSCORRUPTED;
5905 goto out_bh;
5906 }
5907
5908 *j_start = sb_block + 1;
5909 *j_len = ext4_blocks_count(es);
5910 brelse(bh);
5911 return bdev_file;
5912
5913out_bh:
5914 brelse(bh);
5915out_bdev:
5916 bdev_fput(bdev_file);
5917 return ERR_PTR(errno);
5918}
5919
5920static journal_t *ext4_open_dev_journal(struct super_block *sb,
5921 dev_t j_dev)
5922{
5923 journal_t *journal;
5924 ext4_fsblk_t j_start;
5925 ext4_fsblk_t j_len;
5926 struct file *bdev_file;
5927 int errno = 0;
5928
5929 bdev_file = ext4_get_journal_blkdev(sb, j_dev, &j_start, &j_len);
5930 if (IS_ERR(bdev_file))
5931 return ERR_CAST(bdev_file);
5932
5933 journal = jbd2_journal_init_dev(file_bdev(bdev_file), sb->s_bdev, j_start,
5934 j_len, sb->s_blocksize);
5935 if (IS_ERR(journal)) {
5936 ext4_msg(sb, KERN_ERR, "failed to create device journal");
5937 errno = PTR_ERR(journal);
5938 goto out_bdev;
5939 }
5940 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
5941 ext4_msg(sb, KERN_ERR, "External journal has more than one "
5942 "user (unsupported) - %d",
5943 be32_to_cpu(journal->j_superblock->s_nr_users));
5944 errno = -EINVAL;
5945 goto out_journal;
5946 }
5947 journal->j_private = sb;
5948 EXT4_SB(sb)->s_journal_bdev_file = bdev_file;
5949 ext4_init_journal_params(sb, journal);
5950 return journal;
5951
5952out_journal:
5953 jbd2_journal_destroy(journal);
5954out_bdev:
5955 bdev_fput(bdev_file);
5956 return ERR_PTR(errno);
5957}
5958
5959static int ext4_load_journal(struct super_block *sb,
5960 struct ext4_super_block *es,
5961 unsigned long journal_devnum)
5962{
5963 journal_t *journal;
5964 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
5965 dev_t journal_dev;
5966 int err = 0;
5967 int really_read_only;
5968 int journal_dev_ro;
5969
5970 if (WARN_ON_ONCE(!ext4_has_feature_journal(sb)))
5971 return -EFSCORRUPTED;
5972
5973 if (journal_devnum &&
5974 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
5975 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
5976 "numbers have changed");
5977 journal_dev = new_decode_dev(journal_devnum);
5978 } else
5979 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
5980
5981 if (journal_inum && journal_dev) {
5982 ext4_msg(sb, KERN_ERR,
5983 "filesystem has both journal inode and journal device!");
5984 return -EINVAL;
5985 }
5986
5987 if (journal_inum) {
5988 journal = ext4_open_inode_journal(sb, journal_inum);
5989 if (IS_ERR(journal))
5990 return PTR_ERR(journal);
5991 } else {
5992 journal = ext4_open_dev_journal(sb, journal_dev);
5993 if (IS_ERR(journal))
5994 return PTR_ERR(journal);
5995 }
5996
5997 journal_dev_ro = bdev_read_only(journal->j_dev);
5998 really_read_only = bdev_read_only(sb->s_bdev) | journal_dev_ro;
5999
6000 if (journal_dev_ro && !sb_rdonly(sb)) {
6001 ext4_msg(sb, KERN_ERR,
6002 "journal device read-only, try mounting with '-o ro'");
6003 err = -EROFS;
6004 goto err_out;
6005 }
6006
6007 /*
6008 * Are we loading a blank journal or performing recovery after a
6009 * crash? For recovery, we need to check in advance whether we
6010 * can get read-write access to the device.
6011 */
6012 if (ext4_has_feature_journal_needs_recovery(sb)) {
6013 if (sb_rdonly(sb)) {
6014 ext4_msg(sb, KERN_INFO, "INFO: recovery "
6015 "required on readonly filesystem");
6016 if (really_read_only) {
6017 ext4_msg(sb, KERN_ERR, "write access "
6018 "unavailable, cannot proceed "
6019 "(try mounting with noload)");
6020 err = -EROFS;
6021 goto err_out;
6022 }
6023 ext4_msg(sb, KERN_INFO, "write access will "
6024 "be enabled during recovery");
6025 }
6026 }
6027
6028 if (!(journal->j_flags & JBD2_BARRIER))
6029 ext4_msg(sb, KERN_INFO, "barriers disabled");
6030
6031 if (!ext4_has_feature_journal_needs_recovery(sb))
6032 err = jbd2_journal_wipe(journal, !really_read_only);
6033 if (!err) {
6034 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
6035 __le16 orig_state;
6036 bool changed = false;
6037
6038 if (save)
6039 memcpy(save, ((char *) es) +
6040 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
6041 err = jbd2_journal_load(journal);
6042 if (save && memcmp(((char *) es) + EXT4_S_ERR_START,
6043 save, EXT4_S_ERR_LEN)) {
6044 memcpy(((char *) es) + EXT4_S_ERR_START,
6045 save, EXT4_S_ERR_LEN);
6046 changed = true;
6047 }
6048 kfree(save);
6049 orig_state = es->s_state;
6050 es->s_state |= cpu_to_le16(EXT4_SB(sb)->s_mount_state &
6051 EXT4_ERROR_FS);
6052 if (orig_state != es->s_state)
6053 changed = true;
6054 /* Write out restored error information to the superblock */
6055 if (changed && !really_read_only) {
6056 int err2;
6057 err2 = ext4_commit_super(sb);
6058 err = err ? : err2;
6059 }
6060 }
6061
6062 if (err) {
6063 ext4_msg(sb, KERN_ERR, "error loading journal");
6064 goto err_out;
6065 }
6066
6067 EXT4_SB(sb)->s_journal = journal;
6068 err = ext4_clear_journal_err(sb, es);
6069 if (err) {
6070 EXT4_SB(sb)->s_journal = NULL;
6071 jbd2_journal_destroy(journal);
6072 return err;
6073 }
6074
6075 if (!really_read_only && journal_devnum &&
6076 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
6077 es->s_journal_dev = cpu_to_le32(journal_devnum);
6078 ext4_commit_super(sb);
6079 }
6080 if (!really_read_only && journal_inum &&
6081 journal_inum != le32_to_cpu(es->s_journal_inum)) {
6082 es->s_journal_inum = cpu_to_le32(journal_inum);
6083 ext4_commit_super(sb);
6084 }
6085
6086 return 0;
6087
6088err_out:
6089 jbd2_journal_destroy(journal);
6090 return err;
6091}
6092
6093/* Copy state of EXT4_SB(sb) into buffer for on-disk superblock */
6094static void ext4_update_super(struct super_block *sb)
6095{
6096 struct ext4_sb_info *sbi = EXT4_SB(sb);
6097 struct ext4_super_block *es = sbi->s_es;
6098 struct buffer_head *sbh = sbi->s_sbh;
6099
6100 lock_buffer(sbh);
6101 /*
6102 * If the file system is mounted read-only, don't update the
6103 * superblock write time. This avoids updating the superblock
6104 * write time when we are mounting the root file system
6105 * read/only but we need to replay the journal; at that point,
6106 * for people who are east of GMT and who make their clock
6107 * tick in localtime for Windows bug-for-bug compatibility,
6108 * the clock is set in the future, and this will cause e2fsck
6109 * to complain and force a full file system check.
6110 */
6111 if (!sb_rdonly(sb))
6112 ext4_update_tstamp(es, s_wtime);
6113 es->s_kbytes_written =
6114 cpu_to_le64(sbi->s_kbytes_written +
6115 ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -
6116 sbi->s_sectors_written_start) >> 1));
6117 if (percpu_counter_initialized(&sbi->s_freeclusters_counter))
6118 ext4_free_blocks_count_set(es,
6119 EXT4_C2B(sbi, percpu_counter_sum_positive(
6120 &sbi->s_freeclusters_counter)));
6121 if (percpu_counter_initialized(&sbi->s_freeinodes_counter))
6122 es->s_free_inodes_count =
6123 cpu_to_le32(percpu_counter_sum_positive(
6124 &sbi->s_freeinodes_counter));
6125 /* Copy error information to the on-disk superblock */
6126 spin_lock(&sbi->s_error_lock);
6127 if (sbi->s_add_error_count > 0) {
6128 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
6129 if (!es->s_first_error_time && !es->s_first_error_time_hi) {
6130 __ext4_update_tstamp(&es->s_first_error_time,
6131 &es->s_first_error_time_hi,
6132 sbi->s_first_error_time);
6133 strncpy(es->s_first_error_func, sbi->s_first_error_func,
6134 sizeof(es->s_first_error_func));
6135 es->s_first_error_line =
6136 cpu_to_le32(sbi->s_first_error_line);
6137 es->s_first_error_ino =
6138 cpu_to_le32(sbi->s_first_error_ino);
6139 es->s_first_error_block =
6140 cpu_to_le64(sbi->s_first_error_block);
6141 es->s_first_error_errcode =
6142 ext4_errno_to_code(sbi->s_first_error_code);
6143 }
6144 __ext4_update_tstamp(&es->s_last_error_time,
6145 &es->s_last_error_time_hi,
6146 sbi->s_last_error_time);
6147 strncpy(es->s_last_error_func, sbi->s_last_error_func,
6148 sizeof(es->s_last_error_func));
6149 es->s_last_error_line = cpu_to_le32(sbi->s_last_error_line);
6150 es->s_last_error_ino = cpu_to_le32(sbi->s_last_error_ino);
6151 es->s_last_error_block = cpu_to_le64(sbi->s_last_error_block);
6152 es->s_last_error_errcode =
6153 ext4_errno_to_code(sbi->s_last_error_code);
6154 /*
6155 * Start the daily error reporting function if it hasn't been
6156 * started already
6157 */
6158 if (!es->s_error_count)
6159 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);
6160 le32_add_cpu(&es->s_error_count, sbi->s_add_error_count);
6161 sbi->s_add_error_count = 0;
6162 }
6163 spin_unlock(&sbi->s_error_lock);
6164
6165 ext4_superblock_csum_set(sb);
6166 unlock_buffer(sbh);
6167}
6168
6169static int ext4_commit_super(struct super_block *sb)
6170{
6171 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
6172
6173 if (!sbh)
6174 return -EINVAL;
6175 if (block_device_ejected(sb))
6176 return -ENODEV;
6177
6178 ext4_update_super(sb);
6179
6180 lock_buffer(sbh);
6181 /* Buffer got discarded which means block device got invalidated */
6182 if (!buffer_mapped(sbh)) {
6183 unlock_buffer(sbh);
6184 return -EIO;
6185 }
6186
6187 if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
6188 /*
6189 * Oh, dear. A previous attempt to write the
6190 * superblock failed. This could happen because the
6191 * USB device was yanked out. Or it could happen to
6192 * be a transient write error and maybe the block will
6193 * be remapped. Nothing we can do but to retry the
6194 * write and hope for the best.
6195 */
6196 ext4_msg(sb, KERN_ERR, "previous I/O error to "
6197 "superblock detected");
6198 clear_buffer_write_io_error(sbh);
6199 set_buffer_uptodate(sbh);
6200 }
6201 get_bh(sbh);
6202 /* Clear potential dirty bit if it was journalled update */
6203 clear_buffer_dirty(sbh);
6204 sbh->b_end_io = end_buffer_write_sync;
6205 submit_bh(REQ_OP_WRITE | REQ_SYNC |
6206 (test_opt(sb, BARRIER) ? REQ_FUA : 0), sbh);
6207 wait_on_buffer(sbh);
6208 if (buffer_write_io_error(sbh)) {
6209 ext4_msg(sb, KERN_ERR, "I/O error while writing "
6210 "superblock");
6211 clear_buffer_write_io_error(sbh);
6212 set_buffer_uptodate(sbh);
6213 return -EIO;
6214 }
6215 return 0;
6216}
6217
6218/*
6219 * Have we just finished recovery? If so, and if we are mounting (or
6220 * remounting) the filesystem readonly, then we will end up with a
6221 * consistent fs on disk. Record that fact.
6222 */
6223static int ext4_mark_recovery_complete(struct super_block *sb,
6224 struct ext4_super_block *es)
6225{
6226 int err;
6227 journal_t *journal = EXT4_SB(sb)->s_journal;
6228
6229 if (!ext4_has_feature_journal(sb)) {
6230 if (journal != NULL) {
6231 ext4_error(sb, "Journal got removed while the fs was "
6232 "mounted!");
6233 return -EFSCORRUPTED;
6234 }
6235 return 0;
6236 }
6237 jbd2_journal_lock_updates(journal);
6238 err = jbd2_journal_flush(journal, 0);
6239 if (err < 0)
6240 goto out;
6241
6242 if (sb_rdonly(sb) && (ext4_has_feature_journal_needs_recovery(sb) ||
6243 ext4_has_feature_orphan_present(sb))) {
6244 if (!ext4_orphan_file_empty(sb)) {
6245 ext4_error(sb, "Orphan file not empty on read-only fs.");
6246 err = -EFSCORRUPTED;
6247 goto out;
6248 }
6249 ext4_clear_feature_journal_needs_recovery(sb);
6250 ext4_clear_feature_orphan_present(sb);
6251 ext4_commit_super(sb);
6252 }
6253out:
6254 jbd2_journal_unlock_updates(journal);
6255 return err;
6256}
6257
6258/*
6259 * If we are mounting (or read-write remounting) a filesystem whose journal
6260 * has recorded an error from a previous lifetime, move that error to the
6261 * main filesystem now.
6262 */
6263static int ext4_clear_journal_err(struct super_block *sb,
6264 struct ext4_super_block *es)
6265{
6266 journal_t *journal;
6267 int j_errno;
6268 const char *errstr;
6269
6270 if (!ext4_has_feature_journal(sb)) {
6271 ext4_error(sb, "Journal got removed while the fs was mounted!");
6272 return -EFSCORRUPTED;
6273 }
6274
6275 journal = EXT4_SB(sb)->s_journal;
6276
6277 /*
6278 * Now check for any error status which may have been recorded in the
6279 * journal by a prior ext4_error() or ext4_abort()
6280 */
6281
6282 j_errno = jbd2_journal_errno(journal);
6283 if (j_errno) {
6284 char nbuf[16];
6285
6286 errstr = ext4_decode_error(sb, j_errno, nbuf);
6287 ext4_warning(sb, "Filesystem error recorded "
6288 "from previous mount: %s", errstr);
6289
6290 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
6291 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
6292 j_errno = ext4_commit_super(sb);
6293 if (j_errno)
6294 return j_errno;
6295 ext4_warning(sb, "Marked fs in need of filesystem check.");
6296
6297 jbd2_journal_clear_err(journal);
6298 jbd2_journal_update_sb_errno(journal);
6299 }
6300 return 0;
6301}
6302
6303/*
6304 * Force the running and committing transactions to commit,
6305 * and wait on the commit.
6306 */
6307int ext4_force_commit(struct super_block *sb)
6308{
6309 return ext4_journal_force_commit(EXT4_SB(sb)->s_journal);
6310}
6311
6312static int ext4_sync_fs(struct super_block *sb, int wait)
6313{
6314 int ret = 0;
6315 tid_t target;
6316 bool needs_barrier = false;
6317 struct ext4_sb_info *sbi = EXT4_SB(sb);
6318
6319 if (unlikely(ext4_forced_shutdown(sb)))
6320 return 0;
6321
6322 trace_ext4_sync_fs(sb, wait);
6323 flush_workqueue(sbi->rsv_conversion_wq);
6324 /*
6325 * Writeback quota in non-journalled quota case - journalled quota has
6326 * no dirty dquots
6327 */
6328 dquot_writeback_dquots(sb, -1);
6329 /*
6330 * Data writeback is possible w/o journal transaction, so barrier must
6331 * being sent at the end of the function. But we can skip it if
6332 * transaction_commit will do it for us.
6333 */
6334 if (sbi->s_journal) {
6335 target = jbd2_get_latest_transaction(sbi->s_journal);
6336 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
6337 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
6338 needs_barrier = true;
6339
6340 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
6341 if (wait)
6342 ret = jbd2_log_wait_commit(sbi->s_journal,
6343 target);
6344 }
6345 } else if (wait && test_opt(sb, BARRIER))
6346 needs_barrier = true;
6347 if (needs_barrier) {
6348 int err;
6349 err = blkdev_issue_flush(sb->s_bdev);
6350 if (!ret)
6351 ret = err;
6352 }
6353
6354 return ret;
6355}
6356
6357/*
6358 * LVM calls this function before a (read-only) snapshot is created. This
6359 * gives us a chance to flush the journal completely and mark the fs clean.
6360 *
6361 * Note that only this function cannot bring a filesystem to be in a clean
6362 * state independently. It relies on upper layer to stop all data & metadata
6363 * modifications.
6364 */
6365static int ext4_freeze(struct super_block *sb)
6366{
6367 int error = 0;
6368 journal_t *journal = EXT4_SB(sb)->s_journal;
6369
6370 if (journal) {
6371 /* Now we set up the journal barrier. */
6372 jbd2_journal_lock_updates(journal);
6373
6374 /*
6375 * Don't clear the needs_recovery flag if we failed to
6376 * flush the journal.
6377 */
6378 error = jbd2_journal_flush(journal, 0);
6379 if (error < 0)
6380 goto out;
6381
6382 /* Journal blocked and flushed, clear needs_recovery flag. */
6383 ext4_clear_feature_journal_needs_recovery(sb);
6384 if (ext4_orphan_file_empty(sb))
6385 ext4_clear_feature_orphan_present(sb);
6386 }
6387
6388 error = ext4_commit_super(sb);
6389out:
6390 if (journal)
6391 /* we rely on upper layer to stop further updates */
6392 jbd2_journal_unlock_updates(journal);
6393 return error;
6394}
6395
6396/*
6397 * Called by LVM after the snapshot is done. We need to reset the RECOVER
6398 * flag here, even though the filesystem is not technically dirty yet.
6399 */
6400static int ext4_unfreeze(struct super_block *sb)
6401{
6402 if (ext4_forced_shutdown(sb))
6403 return 0;
6404
6405 if (EXT4_SB(sb)->s_journal) {
6406 /* Reset the needs_recovery flag before the fs is unlocked. */
6407 ext4_set_feature_journal_needs_recovery(sb);
6408 if (ext4_has_feature_orphan_file(sb))
6409 ext4_set_feature_orphan_present(sb);
6410 }
6411
6412 ext4_commit_super(sb);
6413 return 0;
6414}
6415
6416/*
6417 * Structure to save mount options for ext4_remount's benefit
6418 */
6419struct ext4_mount_options {
6420 unsigned long s_mount_opt;
6421 unsigned long s_mount_opt2;
6422 kuid_t s_resuid;
6423 kgid_t s_resgid;
6424 unsigned long s_commit_interval;
6425 u32 s_min_batch_time, s_max_batch_time;
6426#ifdef CONFIG_QUOTA
6427 int s_jquota_fmt;
6428 char *s_qf_names[EXT4_MAXQUOTAS];
6429#endif
6430};
6431
6432static int __ext4_remount(struct fs_context *fc, struct super_block *sb)
6433{
6434 struct ext4_fs_context *ctx = fc->fs_private;
6435 struct ext4_super_block *es;
6436 struct ext4_sb_info *sbi = EXT4_SB(sb);
6437 unsigned long old_sb_flags;
6438 struct ext4_mount_options old_opts;
6439 ext4_group_t g;
6440 int err = 0;
6441 int alloc_ctx;
6442#ifdef CONFIG_QUOTA
6443 int enable_quota = 0;
6444 int i, j;
6445 char *to_free[EXT4_MAXQUOTAS];
6446#endif
6447
6448
6449 /* Store the original options */
6450 old_sb_flags = sb->s_flags;
6451 old_opts.s_mount_opt = sbi->s_mount_opt;
6452 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
6453 old_opts.s_resuid = sbi->s_resuid;
6454 old_opts.s_resgid = sbi->s_resgid;
6455 old_opts.s_commit_interval = sbi->s_commit_interval;
6456 old_opts.s_min_batch_time = sbi->s_min_batch_time;
6457 old_opts.s_max_batch_time = sbi->s_max_batch_time;
6458#ifdef CONFIG_QUOTA
6459 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
6460 for (i = 0; i < EXT4_MAXQUOTAS; i++)
6461 if (sbi->s_qf_names[i]) {
6462 char *qf_name = get_qf_name(sb, sbi, i);
6463
6464 old_opts.s_qf_names[i] = kstrdup(qf_name, GFP_KERNEL);
6465 if (!old_opts.s_qf_names[i]) {
6466 for (j = 0; j < i; j++)
6467 kfree(old_opts.s_qf_names[j]);
6468 return -ENOMEM;
6469 }
6470 } else
6471 old_opts.s_qf_names[i] = NULL;
6472#endif
6473 if (!(ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO)) {
6474 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
6475 ctx->journal_ioprio =
6476 sbi->s_journal->j_task->io_context->ioprio;
6477 else
6478 ctx->journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
6479
6480 }
6481
6482 /*
6483 * Changing the DIOREAD_NOLOCK or DELALLOC mount options may cause
6484 * two calls to ext4_should_dioread_nolock() to return inconsistent
6485 * values, triggering WARN_ON in ext4_add_complete_io(). we grab
6486 * here s_writepages_rwsem to avoid race between writepages ops and
6487 * remount.
6488 */
6489 alloc_ctx = ext4_writepages_down_write(sb);
6490 ext4_apply_options(fc, sb);
6491 ext4_writepages_up_write(sb, alloc_ctx);
6492
6493 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
6494 test_opt(sb, JOURNAL_CHECKSUM)) {
6495 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
6496 "during remount not supported; ignoring");
6497 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6498 }
6499
6500 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
6501 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
6502 ext4_msg(sb, KERN_ERR, "can't mount with "
6503 "both data=journal and delalloc");
6504 err = -EINVAL;
6505 goto restore_opts;
6506 }
6507 if (test_opt(sb, DIOREAD_NOLOCK)) {
6508 ext4_msg(sb, KERN_ERR, "can't mount with "
6509 "both data=journal and dioread_nolock");
6510 err = -EINVAL;
6511 goto restore_opts;
6512 }
6513 } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
6514 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
6515 ext4_msg(sb, KERN_ERR, "can't mount with "
6516 "journal_async_commit in data=ordered mode");
6517 err = -EINVAL;
6518 goto restore_opts;
6519 }
6520 }
6521
6522 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
6523 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
6524 err = -EINVAL;
6525 goto restore_opts;
6526 }
6527
6528 if (test_opt2(sb, ABORT))
6529 ext4_abort(sb, ESHUTDOWN, "Abort forced by user");
6530
6531 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
6532 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
6533
6534 es = sbi->s_es;
6535
6536 if (sbi->s_journal) {
6537 ext4_init_journal_params(sb, sbi->s_journal);
6538 set_task_ioprio(sbi->s_journal->j_task, ctx->journal_ioprio);
6539 }
6540
6541 /* Flush outstanding errors before changing fs state */
6542 flush_work(&sbi->s_sb_upd_work);
6543
6544 if ((bool)(fc->sb_flags & SB_RDONLY) != sb_rdonly(sb)) {
6545 if (ext4_forced_shutdown(sb)) {
6546 err = -EROFS;
6547 goto restore_opts;
6548 }
6549
6550 if (fc->sb_flags & SB_RDONLY) {
6551 err = sync_filesystem(sb);
6552 if (err < 0)
6553 goto restore_opts;
6554 err = dquot_suspend(sb, -1);
6555 if (err < 0)
6556 goto restore_opts;
6557
6558 /*
6559 * First of all, the unconditional stuff we have to do
6560 * to disable replay of the journal when we next remount
6561 */
6562 sb->s_flags |= SB_RDONLY;
6563
6564 /*
6565 * OK, test if we are remounting a valid rw partition
6566 * readonly, and if so set the rdonly flag and then
6567 * mark the partition as valid again.
6568 */
6569 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
6570 (sbi->s_mount_state & EXT4_VALID_FS))
6571 es->s_state = cpu_to_le16(sbi->s_mount_state);
6572
6573 if (sbi->s_journal) {
6574 /*
6575 * We let remount-ro finish even if marking fs
6576 * as clean failed...
6577 */
6578 ext4_mark_recovery_complete(sb, es);
6579 }
6580 } else {
6581 /* Make sure we can mount this feature set readwrite */
6582 if (ext4_has_feature_readonly(sb) ||
6583 !ext4_feature_set_ok(sb, 0)) {
6584 err = -EROFS;
6585 goto restore_opts;
6586 }
6587 /*
6588 * Make sure the group descriptor checksums
6589 * are sane. If they aren't, refuse to remount r/w.
6590 */
6591 for (g = 0; g < sbi->s_groups_count; g++) {
6592 struct ext4_group_desc *gdp =
6593 ext4_get_group_desc(sb, g, NULL);
6594
6595 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
6596 ext4_msg(sb, KERN_ERR,
6597 "ext4_remount: Checksum for group %u failed (%u!=%u)",
6598 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
6599 le16_to_cpu(gdp->bg_checksum));
6600 err = -EFSBADCRC;
6601 goto restore_opts;
6602 }
6603 }
6604
6605 /*
6606 * If we have an unprocessed orphan list hanging
6607 * around from a previously readonly bdev mount,
6608 * require a full umount/remount for now.
6609 */
6610 if (es->s_last_orphan || !ext4_orphan_file_empty(sb)) {
6611 ext4_msg(sb, KERN_WARNING, "Couldn't "
6612 "remount RDWR because of unprocessed "
6613 "orphan inode list. Please "
6614 "umount/remount instead");
6615 err = -EINVAL;
6616 goto restore_opts;
6617 }
6618
6619 /*
6620 * Mounting a RDONLY partition read-write, so reread
6621 * and store the current valid flag. (It may have
6622 * been changed by e2fsck since we originally mounted
6623 * the partition.)
6624 */
6625 if (sbi->s_journal) {
6626 err = ext4_clear_journal_err(sb, es);
6627 if (err)
6628 goto restore_opts;
6629 }
6630 sbi->s_mount_state = (le16_to_cpu(es->s_state) &
6631 ~EXT4_FC_REPLAY);
6632
6633 err = ext4_setup_super(sb, es, 0);
6634 if (err)
6635 goto restore_opts;
6636
6637 sb->s_flags &= ~SB_RDONLY;
6638 if (ext4_has_feature_mmp(sb)) {
6639 err = ext4_multi_mount_protect(sb,
6640 le64_to_cpu(es->s_mmp_block));
6641 if (err)
6642 goto restore_opts;
6643 }
6644#ifdef CONFIG_QUOTA
6645 enable_quota = 1;
6646#endif
6647 }
6648 }
6649
6650 /*
6651 * Handle creation of system zone data early because it can fail.
6652 * Releasing of existing data is done when we are sure remount will
6653 * succeed.
6654 */
6655 if (test_opt(sb, BLOCK_VALIDITY) && !sbi->s_system_blks) {
6656 err = ext4_setup_system_zone(sb);
6657 if (err)
6658 goto restore_opts;
6659 }
6660
6661 if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) {
6662 err = ext4_commit_super(sb);
6663 if (err)
6664 goto restore_opts;
6665 }
6666
6667#ifdef CONFIG_QUOTA
6668 if (enable_quota) {
6669 if (sb_any_quota_suspended(sb))
6670 dquot_resume(sb, -1);
6671 else if (ext4_has_feature_quota(sb)) {
6672 err = ext4_enable_quotas(sb);
6673 if (err)
6674 goto restore_opts;
6675 }
6676 }
6677 /* Release old quota file names */
6678 for (i = 0; i < EXT4_MAXQUOTAS; i++)
6679 kfree(old_opts.s_qf_names[i]);
6680#endif
6681 if (!test_opt(sb, BLOCK_VALIDITY) && sbi->s_system_blks)
6682 ext4_release_system_zone(sb);
6683
6684 /*
6685 * Reinitialize lazy itable initialization thread based on
6686 * current settings
6687 */
6688 if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
6689 ext4_unregister_li_request(sb);
6690 else {
6691 ext4_group_t first_not_zeroed;
6692 first_not_zeroed = ext4_has_uninit_itable(sb);
6693 ext4_register_li_request(sb, first_not_zeroed);
6694 }
6695
6696 if (!ext4_has_feature_mmp(sb) || sb_rdonly(sb))
6697 ext4_stop_mmpd(sbi);
6698
6699 return 0;
6700
6701restore_opts:
6702 /*
6703 * If there was a failing r/w to ro transition, we may need to
6704 * re-enable quota
6705 */
6706 if (sb_rdonly(sb) && !(old_sb_flags & SB_RDONLY) &&
6707 sb_any_quota_suspended(sb))
6708 dquot_resume(sb, -1);
6709
6710 alloc_ctx = ext4_writepages_down_write(sb);
6711 sb->s_flags = old_sb_flags;
6712 sbi->s_mount_opt = old_opts.s_mount_opt;
6713 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
6714 sbi->s_resuid = old_opts.s_resuid;
6715 sbi->s_resgid = old_opts.s_resgid;
6716 sbi->s_commit_interval = old_opts.s_commit_interval;
6717 sbi->s_min_batch_time = old_opts.s_min_batch_time;
6718 sbi->s_max_batch_time = old_opts.s_max_batch_time;
6719 ext4_writepages_up_write(sb, alloc_ctx);
6720
6721 if (!test_opt(sb, BLOCK_VALIDITY) && sbi->s_system_blks)
6722 ext4_release_system_zone(sb);
6723#ifdef CONFIG_QUOTA
6724 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
6725 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
6726 to_free[i] = get_qf_name(sb, sbi, i);
6727 rcu_assign_pointer(sbi->s_qf_names[i], old_opts.s_qf_names[i]);
6728 }
6729 synchronize_rcu();
6730 for (i = 0; i < EXT4_MAXQUOTAS; i++)
6731 kfree(to_free[i]);
6732#endif
6733 if (!ext4_has_feature_mmp(sb) || sb_rdonly(sb))
6734 ext4_stop_mmpd(sbi);
6735 return err;
6736}
6737
6738static int ext4_reconfigure(struct fs_context *fc)
6739{
6740 struct super_block *sb = fc->root->d_sb;
6741 int ret;
6742
6743 fc->s_fs_info = EXT4_SB(sb);
6744
6745 ret = ext4_check_opt_consistency(fc, sb);
6746 if (ret < 0)
6747 return ret;
6748
6749 ret = __ext4_remount(fc, sb);
6750 if (ret < 0)
6751 return ret;
6752
6753 ext4_msg(sb, KERN_INFO, "re-mounted %pU %s. Quota mode: %s.",
6754 &sb->s_uuid, sb_rdonly(sb) ? "ro" : "r/w",
6755 ext4_quota_mode(sb));
6756
6757 return 0;
6758}
6759
6760#ifdef CONFIG_QUOTA
6761static int ext4_statfs_project(struct super_block *sb,
6762 kprojid_t projid, struct kstatfs *buf)
6763{
6764 struct kqid qid;
6765 struct dquot *dquot;
6766 u64 limit;
6767 u64 curblock;
6768
6769 qid = make_kqid_projid(projid);
6770 dquot = dqget(sb, qid);
6771 if (IS_ERR(dquot))
6772 return PTR_ERR(dquot);
6773 spin_lock(&dquot->dq_dqb_lock);
6774
6775 limit = min_not_zero(dquot->dq_dqb.dqb_bsoftlimit,
6776 dquot->dq_dqb.dqb_bhardlimit);
6777 limit >>= sb->s_blocksize_bits;
6778
6779 if (limit && buf->f_blocks > limit) {
6780 curblock = (dquot->dq_dqb.dqb_curspace +
6781 dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits;
6782 buf->f_blocks = limit;
6783 buf->f_bfree = buf->f_bavail =
6784 (buf->f_blocks > curblock) ?
6785 (buf->f_blocks - curblock) : 0;
6786 }
6787
6788 limit = min_not_zero(dquot->dq_dqb.dqb_isoftlimit,
6789 dquot->dq_dqb.dqb_ihardlimit);
6790 if (limit && buf->f_files > limit) {
6791 buf->f_files = limit;
6792 buf->f_ffree =
6793 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
6794 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
6795 }
6796
6797 spin_unlock(&dquot->dq_dqb_lock);
6798 dqput(dquot);
6799 return 0;
6800}
6801#endif
6802
6803static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
6804{
6805 struct super_block *sb = dentry->d_sb;
6806 struct ext4_sb_info *sbi = EXT4_SB(sb);
6807 struct ext4_super_block *es = sbi->s_es;
6808 ext4_fsblk_t overhead = 0, resv_blocks;
6809 s64 bfree;
6810 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
6811
6812 if (!test_opt(sb, MINIX_DF))
6813 overhead = sbi->s_overhead;
6814
6815 buf->f_type = EXT4_SUPER_MAGIC;
6816 buf->f_bsize = sb->s_blocksize;
6817 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
6818 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
6819 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
6820 /* prevent underflow in case that few free space is available */
6821 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
6822 buf->f_bavail = buf->f_bfree -
6823 (ext4_r_blocks_count(es) + resv_blocks);
6824 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
6825 buf->f_bavail = 0;
6826 buf->f_files = le32_to_cpu(es->s_inodes_count);
6827 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
6828 buf->f_namelen = EXT4_NAME_LEN;
6829 buf->f_fsid = uuid_to_fsid(es->s_uuid);
6830
6831#ifdef CONFIG_QUOTA
6832 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
6833 sb_has_quota_limits_enabled(sb, PRJQUOTA))
6834 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
6835#endif
6836 return 0;
6837}
6838
6839
6840#ifdef CONFIG_QUOTA
6841
6842/*
6843 * Helper functions so that transaction is started before we acquire dqio_sem
6844 * to keep correct lock ordering of transaction > dqio_sem
6845 */
6846static inline struct inode *dquot_to_inode(struct dquot *dquot)
6847{
6848 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
6849}
6850
6851static int ext4_write_dquot(struct dquot *dquot)
6852{
6853 int ret, err;
6854 handle_t *handle;
6855 struct inode *inode;
6856
6857 inode = dquot_to_inode(dquot);
6858 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
6859 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
6860 if (IS_ERR(handle))
6861 return PTR_ERR(handle);
6862 ret = dquot_commit(dquot);
6863 if (ret < 0)
6864 ext4_error_err(dquot->dq_sb, -ret,
6865 "Failed to commit dquot type %d",
6866 dquot->dq_id.type);
6867 err = ext4_journal_stop(handle);
6868 if (!ret)
6869 ret = err;
6870 return ret;
6871}
6872
6873static int ext4_acquire_dquot(struct dquot *dquot)
6874{
6875 int ret, err;
6876 handle_t *handle;
6877
6878 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
6879 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
6880 if (IS_ERR(handle))
6881 return PTR_ERR(handle);
6882 ret = dquot_acquire(dquot);
6883 if (ret < 0)
6884 ext4_error_err(dquot->dq_sb, -ret,
6885 "Failed to acquire dquot type %d",
6886 dquot->dq_id.type);
6887 err = ext4_journal_stop(handle);
6888 if (!ret)
6889 ret = err;
6890 return ret;
6891}
6892
6893static int ext4_release_dquot(struct dquot *dquot)
6894{
6895 int ret, err;
6896 handle_t *handle;
6897
6898 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
6899 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
6900 if (IS_ERR(handle)) {
6901 /* Release dquot anyway to avoid endless cycle in dqput() */
6902 dquot_release(dquot);
6903 return PTR_ERR(handle);
6904 }
6905 ret = dquot_release(dquot);
6906 if (ret < 0)
6907 ext4_error_err(dquot->dq_sb, -ret,
6908 "Failed to release dquot type %d",
6909 dquot->dq_id.type);
6910 err = ext4_journal_stop(handle);
6911 if (!ret)
6912 ret = err;
6913 return ret;
6914}
6915
6916static int ext4_mark_dquot_dirty(struct dquot *dquot)
6917{
6918 struct super_block *sb = dquot->dq_sb;
6919
6920 if (ext4_is_quota_journalled(sb)) {
6921 dquot_mark_dquot_dirty(dquot);
6922 return ext4_write_dquot(dquot);
6923 } else {
6924 return dquot_mark_dquot_dirty(dquot);
6925 }
6926}
6927
6928static int ext4_write_info(struct super_block *sb, int type)
6929{
6930 int ret, err;
6931 handle_t *handle;
6932
6933 /* Data block + inode block */
6934 handle = ext4_journal_start_sb(sb, EXT4_HT_QUOTA, 2);
6935 if (IS_ERR(handle))
6936 return PTR_ERR(handle);
6937 ret = dquot_commit_info(sb, type);
6938 err = ext4_journal_stop(handle);
6939 if (!ret)
6940 ret = err;
6941 return ret;
6942}
6943
6944static void lockdep_set_quota_inode(struct inode *inode, int subclass)
6945{
6946 struct ext4_inode_info *ei = EXT4_I(inode);
6947
6948 /* The first argument of lockdep_set_subclass has to be
6949 * *exactly* the same as the argument to init_rwsem() --- in
6950 * this case, in init_once() --- or lockdep gets unhappy
6951 * because the name of the lock is set using the
6952 * stringification of the argument to init_rwsem().
6953 */
6954 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
6955 lockdep_set_subclass(&ei->i_data_sem, subclass);
6956}
6957
6958/*
6959 * Standard function to be called on quota_on
6960 */
6961static int ext4_quota_on(struct super_block *sb, int type, int format_id,
6962 const struct path *path)
6963{
6964 int err;
6965
6966 if (!test_opt(sb, QUOTA))
6967 return -EINVAL;
6968
6969 /* Quotafile not on the same filesystem? */
6970 if (path->dentry->d_sb != sb)
6971 return -EXDEV;
6972
6973 /* Quota already enabled for this file? */
6974 if (IS_NOQUOTA(d_inode(path->dentry)))
6975 return -EBUSY;
6976
6977 /* Journaling quota? */
6978 if (EXT4_SB(sb)->s_qf_names[type]) {
6979 /* Quotafile not in fs root? */
6980 if (path->dentry->d_parent != sb->s_root)
6981 ext4_msg(sb, KERN_WARNING,
6982 "Quota file not on filesystem root. "
6983 "Journaled quota will not work");
6984 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
6985 } else {
6986 /*
6987 * Clear the flag just in case mount options changed since
6988 * last time.
6989 */
6990 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
6991 }
6992
6993 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
6994 err = dquot_quota_on(sb, type, format_id, path);
6995 if (!err) {
6996 struct inode *inode = d_inode(path->dentry);
6997 handle_t *handle;
6998
6999 /*
7000 * Set inode flags to prevent userspace from messing with quota
7001 * files. If this fails, we return success anyway since quotas
7002 * are already enabled and this is not a hard failure.
7003 */
7004 inode_lock(inode);
7005 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
7006 if (IS_ERR(handle))
7007 goto unlock_inode;
7008 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
7009 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
7010 S_NOATIME | S_IMMUTABLE);
7011 err = ext4_mark_inode_dirty(handle, inode);
7012 ext4_journal_stop(handle);
7013 unlock_inode:
7014 inode_unlock(inode);
7015 if (err)
7016 dquot_quota_off(sb, type);
7017 }
7018 if (err)
7019 lockdep_set_quota_inode(path->dentry->d_inode,
7020 I_DATA_SEM_NORMAL);
7021 return err;
7022}
7023
7024static inline bool ext4_check_quota_inum(int type, unsigned long qf_inum)
7025{
7026 switch (type) {
7027 case USRQUOTA:
7028 return qf_inum == EXT4_USR_QUOTA_INO;
7029 case GRPQUOTA:
7030 return qf_inum == EXT4_GRP_QUOTA_INO;
7031 case PRJQUOTA:
7032 return qf_inum >= EXT4_GOOD_OLD_FIRST_INO;
7033 default:
7034 BUG();
7035 }
7036}
7037
7038static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
7039 unsigned int flags)
7040{
7041 int err;
7042 struct inode *qf_inode;
7043 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7044 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
7045 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
7046 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7047 };
7048
7049 BUG_ON(!ext4_has_feature_quota(sb));
7050
7051 if (!qf_inums[type])
7052 return -EPERM;
7053
7054 if (!ext4_check_quota_inum(type, qf_inums[type])) {
7055 ext4_error(sb, "Bad quota inum: %lu, type: %d",
7056 qf_inums[type], type);
7057 return -EUCLEAN;
7058 }
7059
7060 qf_inode = ext4_iget(sb, qf_inums[type], EXT4_IGET_SPECIAL);
7061 if (IS_ERR(qf_inode)) {
7062 ext4_error(sb, "Bad quota inode: %lu, type: %d",
7063 qf_inums[type], type);
7064 return PTR_ERR(qf_inode);
7065 }
7066
7067 /* Don't account quota for quota files to avoid recursion */
7068 qf_inode->i_flags |= S_NOQUOTA;
7069 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
7070 err = dquot_load_quota_inode(qf_inode, type, format_id, flags);
7071 if (err)
7072 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
7073 iput(qf_inode);
7074
7075 return err;
7076}
7077
7078/* Enable usage tracking for all quota types. */
7079int ext4_enable_quotas(struct super_block *sb)
7080{
7081 int type, err = 0;
7082 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7083 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
7084 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
7085 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7086 };
7087 bool quota_mopt[EXT4_MAXQUOTAS] = {
7088 test_opt(sb, USRQUOTA),
7089 test_opt(sb, GRPQUOTA),
7090 test_opt(sb, PRJQUOTA),
7091 };
7092
7093 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
7094 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7095 if (qf_inums[type]) {
7096 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
7097 DQUOT_USAGE_ENABLED |
7098 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
7099 if (err) {
7100 ext4_warning(sb,
7101 "Failed to enable quota tracking "
7102 "(type=%d, err=%d, ino=%lu). "
7103 "Please run e2fsck to fix.", type,
7104 err, qf_inums[type]);
7105
7106 ext4_quotas_off(sb, type);
7107 return err;
7108 }
7109 }
7110 }
7111 return 0;
7112}
7113
7114static int ext4_quota_off(struct super_block *sb, int type)
7115{
7116 struct inode *inode = sb_dqopt(sb)->files[type];
7117 handle_t *handle;
7118 int err;
7119
7120 /* Force all delayed allocation blocks to be allocated.
7121 * Caller already holds s_umount sem */
7122 if (test_opt(sb, DELALLOC))
7123 sync_filesystem(sb);
7124
7125 if (!inode || !igrab(inode))
7126 goto out;
7127
7128 err = dquot_quota_off(sb, type);
7129 if (err || ext4_has_feature_quota(sb))
7130 goto out_put;
7131 /*
7132 * When the filesystem was remounted read-only first, we cannot cleanup
7133 * inode flags here. Bad luck but people should be using QUOTA feature
7134 * these days anyway.
7135 */
7136 if (sb_rdonly(sb))
7137 goto out_put;
7138
7139 inode_lock(inode);
7140 /*
7141 * Update modification times of quota files when userspace can
7142 * start looking at them. If we fail, we return success anyway since
7143 * this is not a hard failure and quotas are already disabled.
7144 */
7145 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
7146 if (IS_ERR(handle)) {
7147 err = PTR_ERR(handle);
7148 goto out_unlock;
7149 }
7150 EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
7151 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
7152 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
7153 err = ext4_mark_inode_dirty(handle, inode);
7154 ext4_journal_stop(handle);
7155out_unlock:
7156 inode_unlock(inode);
7157out_put:
7158 lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);
7159 iput(inode);
7160 return err;
7161out:
7162 return dquot_quota_off(sb, type);
7163}
7164
7165/* Read data from quotafile - avoid pagecache and such because we cannot afford
7166 * acquiring the locks... As quota files are never truncated and quota code
7167 * itself serializes the operations (and no one else should touch the files)
7168 * we don't have to be afraid of races */
7169static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
7170 size_t len, loff_t off)
7171{
7172 struct inode *inode = sb_dqopt(sb)->files[type];
7173 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
7174 int offset = off & (sb->s_blocksize - 1);
7175 int tocopy;
7176 size_t toread;
7177 struct buffer_head *bh;
7178 loff_t i_size = i_size_read(inode);
7179
7180 if (off > i_size)
7181 return 0;
7182 if (off+len > i_size)
7183 len = i_size-off;
7184 toread = len;
7185 while (toread > 0) {
7186 tocopy = min_t(unsigned long, sb->s_blocksize - offset, toread);
7187 bh = ext4_bread(NULL, inode, blk, 0);
7188 if (IS_ERR(bh))
7189 return PTR_ERR(bh);
7190 if (!bh) /* A hole? */
7191 memset(data, 0, tocopy);
7192 else
7193 memcpy(data, bh->b_data+offset, tocopy);
7194 brelse(bh);
7195 offset = 0;
7196 toread -= tocopy;
7197 data += tocopy;
7198 blk++;
7199 }
7200 return len;
7201}
7202
7203/* Write to quotafile (we know the transaction is already started and has
7204 * enough credits) */
7205static ssize_t ext4_quota_write(struct super_block *sb, int type,
7206 const char *data, size_t len, loff_t off)
7207{
7208 struct inode *inode = sb_dqopt(sb)->files[type];
7209 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
7210 int err = 0, err2 = 0, offset = off & (sb->s_blocksize - 1);
7211 int retries = 0;
7212 struct buffer_head *bh;
7213 handle_t *handle = journal_current_handle();
7214
7215 if (!handle) {
7216 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
7217 " cancelled because transaction is not started",
7218 (unsigned long long)off, (unsigned long long)len);
7219 return -EIO;
7220 }
7221 /*
7222 * Since we account only one data block in transaction credits,
7223 * then it is impossible to cross a block boundary.
7224 */
7225 if (sb->s_blocksize - offset < len) {
7226 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
7227 " cancelled because not block aligned",
7228 (unsigned long long)off, (unsigned long long)len);
7229 return -EIO;
7230 }
7231
7232 do {
7233 bh = ext4_bread(handle, inode, blk,
7234 EXT4_GET_BLOCKS_CREATE |
7235 EXT4_GET_BLOCKS_METADATA_NOFAIL);
7236 } while (PTR_ERR(bh) == -ENOSPC &&
7237 ext4_should_retry_alloc(inode->i_sb, &retries));
7238 if (IS_ERR(bh))
7239 return PTR_ERR(bh);
7240 if (!bh)
7241 goto out;
7242 BUFFER_TRACE(bh, "get write access");
7243 err = ext4_journal_get_write_access(handle, sb, bh, EXT4_JTR_NONE);
7244 if (err) {
7245 brelse(bh);
7246 return err;
7247 }
7248 lock_buffer(bh);
7249 memcpy(bh->b_data+offset, data, len);
7250 flush_dcache_page(bh->b_page);
7251 unlock_buffer(bh);
7252 err = ext4_handle_dirty_metadata(handle, NULL, bh);
7253 brelse(bh);
7254out:
7255 if (inode->i_size < off + len) {
7256 i_size_write(inode, off + len);
7257 EXT4_I(inode)->i_disksize = inode->i_size;
7258 err2 = ext4_mark_inode_dirty(handle, inode);
7259 if (unlikely(err2 && !err))
7260 err = err2;
7261 }
7262 return err ? err : len;
7263}
7264#endif
7265
7266#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
7267static inline void register_as_ext2(void)
7268{
7269 int err = register_filesystem(&ext2_fs_type);
7270 if (err)
7271 printk(KERN_WARNING
7272 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
7273}
7274
7275static inline void unregister_as_ext2(void)
7276{
7277 unregister_filesystem(&ext2_fs_type);
7278}
7279
7280static inline int ext2_feature_set_ok(struct super_block *sb)
7281{
7282 if (ext4_has_unknown_ext2_incompat_features(sb))
7283 return 0;
7284 if (sb_rdonly(sb))
7285 return 1;
7286 if (ext4_has_unknown_ext2_ro_compat_features(sb))
7287 return 0;
7288 return 1;
7289}
7290#else
7291static inline void register_as_ext2(void) { }
7292static inline void unregister_as_ext2(void) { }
7293static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
7294#endif
7295
7296static inline void register_as_ext3(void)
7297{
7298 int err = register_filesystem(&ext3_fs_type);
7299 if (err)
7300 printk(KERN_WARNING
7301 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
7302}
7303
7304static inline void unregister_as_ext3(void)
7305{
7306 unregister_filesystem(&ext3_fs_type);
7307}
7308
7309static inline int ext3_feature_set_ok(struct super_block *sb)
7310{
7311 if (ext4_has_unknown_ext3_incompat_features(sb))
7312 return 0;
7313 if (!ext4_has_feature_journal(sb))
7314 return 0;
7315 if (sb_rdonly(sb))
7316 return 1;
7317 if (ext4_has_unknown_ext3_ro_compat_features(sb))
7318 return 0;
7319 return 1;
7320}
7321
7322static void ext4_kill_sb(struct super_block *sb)
7323{
7324 struct ext4_sb_info *sbi = EXT4_SB(sb);
7325 struct file *bdev_file = sbi ? sbi->s_journal_bdev_file : NULL;
7326
7327 kill_block_super(sb);
7328
7329 if (bdev_file)
7330 bdev_fput(bdev_file);
7331}
7332
7333static struct file_system_type ext4_fs_type = {
7334 .owner = THIS_MODULE,
7335 .name = "ext4",
7336 .init_fs_context = ext4_init_fs_context,
7337 .parameters = ext4_param_specs,
7338 .kill_sb = ext4_kill_sb,
7339 .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
7340};
7341MODULE_ALIAS_FS("ext4");
7342
7343/* Shared across all ext4 file systems */
7344wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
7345
7346static int __init ext4_init_fs(void)
7347{
7348 int i, err;
7349
7350 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
7351 ext4_li_info = NULL;
7352
7353 /* Build-time check for flags consistency */
7354 ext4_check_flag_values();
7355
7356 for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
7357 init_waitqueue_head(&ext4__ioend_wq[i]);
7358
7359 err = ext4_init_es();
7360 if (err)
7361 return err;
7362
7363 err = ext4_init_pending();
7364 if (err)
7365 goto out7;
7366
7367 err = ext4_init_post_read_processing();
7368 if (err)
7369 goto out6;
7370
7371 err = ext4_init_pageio();
7372 if (err)
7373 goto out5;
7374
7375 err = ext4_init_system_zone();
7376 if (err)
7377 goto out4;
7378
7379 err = ext4_init_sysfs();
7380 if (err)
7381 goto out3;
7382
7383 err = ext4_init_mballoc();
7384 if (err)
7385 goto out2;
7386 err = init_inodecache();
7387 if (err)
7388 goto out1;
7389
7390 err = ext4_fc_init_dentry_cache();
7391 if (err)
7392 goto out05;
7393
7394 register_as_ext3();
7395 register_as_ext2();
7396 err = register_filesystem(&ext4_fs_type);
7397 if (err)
7398 goto out;
7399
7400 return 0;
7401out:
7402 unregister_as_ext2();
7403 unregister_as_ext3();
7404 ext4_fc_destroy_dentry_cache();
7405out05:
7406 destroy_inodecache();
7407out1:
7408 ext4_exit_mballoc();
7409out2:
7410 ext4_exit_sysfs();
7411out3:
7412 ext4_exit_system_zone();
7413out4:
7414 ext4_exit_pageio();
7415out5:
7416 ext4_exit_post_read_processing();
7417out6:
7418 ext4_exit_pending();
7419out7:
7420 ext4_exit_es();
7421
7422 return err;
7423}
7424
7425static void __exit ext4_exit_fs(void)
7426{
7427 ext4_destroy_lazyinit_thread();
7428 unregister_as_ext2();
7429 unregister_as_ext3();
7430 unregister_filesystem(&ext4_fs_type);
7431 ext4_fc_destroy_dentry_cache();
7432 destroy_inodecache();
7433 ext4_exit_mballoc();
7434 ext4_exit_sysfs();
7435 ext4_exit_system_zone();
7436 ext4_exit_pageio();
7437 ext4_exit_post_read_processing();
7438 ext4_exit_es();
7439 ext4_exit_pending();
7440}
7441
7442MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
7443MODULE_DESCRIPTION("Fourth Extended Filesystem");
7444MODULE_LICENSE("GPL");
7445MODULE_SOFTDEP("pre: crc32c");
7446module_init(ext4_init_fs)
7447module_exit(ext4_exit_fs)