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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/fs/ext2/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/slab.h>
24#include <linux/init.h>
25#include <linux/blkdev.h>
26#include <linux/parser.h>
27#include <linux/random.h>
28#include <linux/buffer_head.h>
29#include <linux/exportfs.h>
30#include <linux/vfs.h>
31#include <linux/seq_file.h>
32#include <linux/mount.h>
33#include <linux/log2.h>
34#include <linux/quotaops.h>
35#include <linux/uaccess.h>
36#include <linux/dax.h>
37#include <linux/iversion.h>
38#include "ext2.h"
39#include "xattr.h"
40#include "acl.h"
41
42static void ext2_write_super(struct super_block *sb);
43static int ext2_remount (struct super_block * sb, int * flags, char * data);
44static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
45static int ext2_sync_fs(struct super_block *sb, int wait);
46static int ext2_freeze(struct super_block *sb);
47static int ext2_unfreeze(struct super_block *sb);
48
49void ext2_error(struct super_block *sb, const char *function,
50 const char *fmt, ...)
51{
52 struct va_format vaf;
53 va_list args;
54 struct ext2_sb_info *sbi = EXT2_SB(sb);
55 struct ext2_super_block *es = sbi->s_es;
56
57 if (!sb_rdonly(sb)) {
58 spin_lock(&sbi->s_lock);
59 sbi->s_mount_state |= EXT2_ERROR_FS;
60 es->s_state |= cpu_to_le16(EXT2_ERROR_FS);
61 spin_unlock(&sbi->s_lock);
62 ext2_sync_super(sb, es, 1);
63 }
64
65 va_start(args, fmt);
66
67 vaf.fmt = fmt;
68 vaf.va = &args;
69
70 printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n",
71 sb->s_id, function, &vaf);
72
73 va_end(args);
74
75 if (test_opt(sb, ERRORS_PANIC))
76 panic("EXT2-fs: panic from previous error\n");
77 if (!sb_rdonly(sb) && test_opt(sb, ERRORS_RO)) {
78 ext2_msg(sb, KERN_CRIT,
79 "error: remounting filesystem read-only");
80 sb->s_flags |= SB_RDONLY;
81 }
82}
83
84void ext2_msg(struct super_block *sb, const char *prefix,
85 const char *fmt, ...)
86{
87 struct va_format vaf;
88 va_list args;
89
90 va_start(args, fmt);
91
92 vaf.fmt = fmt;
93 vaf.va = &args;
94
95 printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
96
97 va_end(args);
98}
99
100/*
101 * This must be called with sbi->s_lock held.
102 */
103void ext2_update_dynamic_rev(struct super_block *sb)
104{
105 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
106
107 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV)
108 return;
109
110 ext2_msg(sb, KERN_WARNING,
111 "warning: updating to rev %d because of "
112 "new feature flag, running e2fsck is recommended",
113 EXT2_DYNAMIC_REV);
114
115 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO);
116 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE);
117 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV);
118 /* leave es->s_feature_*compat flags alone */
119 /* es->s_uuid will be set by e2fsck if empty */
120
121 /*
122 * The rest of the superblock fields should be zero, and if not it
123 * means they are likely already in use, so leave them alone. We
124 * can leave it up to e2fsck to clean up any inconsistencies there.
125 */
126}
127
128#ifdef CONFIG_QUOTA
129static int ext2_quota_off(struct super_block *sb, int type);
130
131static void ext2_quota_off_umount(struct super_block *sb)
132{
133 int type;
134
135 for (type = 0; type < MAXQUOTAS; type++)
136 ext2_quota_off(sb, type);
137}
138#else
139static inline void ext2_quota_off_umount(struct super_block *sb)
140{
141}
142#endif
143
144static void ext2_put_super (struct super_block * sb)
145{
146 int db_count;
147 int i;
148 struct ext2_sb_info *sbi = EXT2_SB(sb);
149
150 ext2_quota_off_umount(sb);
151
152 ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
153 sbi->s_ea_block_cache = NULL;
154
155 if (!sb_rdonly(sb)) {
156 struct ext2_super_block *es = sbi->s_es;
157
158 spin_lock(&sbi->s_lock);
159 es->s_state = cpu_to_le16(sbi->s_mount_state);
160 spin_unlock(&sbi->s_lock);
161 ext2_sync_super(sb, es, 1);
162 }
163 db_count = sbi->s_gdb_count;
164 for (i = 0; i < db_count; i++)
165 brelse(sbi->s_group_desc[i]);
166 kfree(sbi->s_group_desc);
167 kfree(sbi->s_debts);
168 percpu_counter_destroy(&sbi->s_freeblocks_counter);
169 percpu_counter_destroy(&sbi->s_freeinodes_counter);
170 percpu_counter_destroy(&sbi->s_dirs_counter);
171 brelse (sbi->s_sbh);
172 sb->s_fs_info = NULL;
173 kfree(sbi->s_blockgroup_lock);
174 fs_put_dax(sbi->s_daxdev);
175 kfree(sbi);
176}
177
178static struct kmem_cache * ext2_inode_cachep;
179
180static struct inode *ext2_alloc_inode(struct super_block *sb)
181{
182 struct ext2_inode_info *ei;
183 ei = kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL);
184 if (!ei)
185 return NULL;
186 ei->i_block_alloc_info = NULL;
187 inode_set_iversion(&ei->vfs_inode, 1);
188#ifdef CONFIG_QUOTA
189 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
190#endif
191
192 return &ei->vfs_inode;
193}
194
195static void ext2_free_in_core_inode(struct inode *inode)
196{
197 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
198}
199
200static void init_once(void *foo)
201{
202 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
203
204 rwlock_init(&ei->i_meta_lock);
205#ifdef CONFIG_EXT2_FS_XATTR
206 init_rwsem(&ei->xattr_sem);
207#endif
208 mutex_init(&ei->truncate_mutex);
209#ifdef CONFIG_FS_DAX
210 init_rwsem(&ei->dax_sem);
211#endif
212 inode_init_once(&ei->vfs_inode);
213}
214
215static int __init init_inodecache(void)
216{
217 ext2_inode_cachep = kmem_cache_create_usercopy("ext2_inode_cache",
218 sizeof(struct ext2_inode_info), 0,
219 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
220 SLAB_ACCOUNT),
221 offsetof(struct ext2_inode_info, i_data),
222 sizeof_field(struct ext2_inode_info, i_data),
223 init_once);
224 if (ext2_inode_cachep == NULL)
225 return -ENOMEM;
226 return 0;
227}
228
229static void destroy_inodecache(void)
230{
231 /*
232 * Make sure all delayed rcu free inodes are flushed before we
233 * destroy cache.
234 */
235 rcu_barrier();
236 kmem_cache_destroy(ext2_inode_cachep);
237}
238
239static int ext2_show_options(struct seq_file *seq, struct dentry *root)
240{
241 struct super_block *sb = root->d_sb;
242 struct ext2_sb_info *sbi = EXT2_SB(sb);
243 struct ext2_super_block *es = sbi->s_es;
244 unsigned long def_mount_opts;
245
246 spin_lock(&sbi->s_lock);
247 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
248
249 if (sbi->s_sb_block != 1)
250 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
251 if (test_opt(sb, MINIX_DF))
252 seq_puts(seq, ",minixdf");
253 if (test_opt(sb, GRPID))
254 seq_puts(seq, ",grpid");
255 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS))
256 seq_puts(seq, ",nogrpid");
257 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) ||
258 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) {
259 seq_printf(seq, ",resuid=%u",
260 from_kuid_munged(&init_user_ns, sbi->s_resuid));
261 }
262 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) ||
263 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) {
264 seq_printf(seq, ",resgid=%u",
265 from_kgid_munged(&init_user_ns, sbi->s_resgid));
266 }
267 if (test_opt(sb, ERRORS_RO)) {
268 int def_errors = le16_to_cpu(es->s_errors);
269
270 if (def_errors == EXT2_ERRORS_PANIC ||
271 def_errors == EXT2_ERRORS_CONTINUE) {
272 seq_puts(seq, ",errors=remount-ro");
273 }
274 }
275 if (test_opt(sb, ERRORS_CONT))
276 seq_puts(seq, ",errors=continue");
277 if (test_opt(sb, ERRORS_PANIC))
278 seq_puts(seq, ",errors=panic");
279 if (test_opt(sb, NO_UID32))
280 seq_puts(seq, ",nouid32");
281 if (test_opt(sb, DEBUG))
282 seq_puts(seq, ",debug");
283 if (test_opt(sb, OLDALLOC))
284 seq_puts(seq, ",oldalloc");
285
286#ifdef CONFIG_EXT2_FS_XATTR
287 if (test_opt(sb, XATTR_USER))
288 seq_puts(seq, ",user_xattr");
289 if (!test_opt(sb, XATTR_USER) &&
290 (def_mount_opts & EXT2_DEFM_XATTR_USER)) {
291 seq_puts(seq, ",nouser_xattr");
292 }
293#endif
294
295#ifdef CONFIG_EXT2_FS_POSIX_ACL
296 if (test_opt(sb, POSIX_ACL))
297 seq_puts(seq, ",acl");
298 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL))
299 seq_puts(seq, ",noacl");
300#endif
301
302 if (test_opt(sb, NOBH))
303 seq_puts(seq, ",nobh");
304
305 if (test_opt(sb, USRQUOTA))
306 seq_puts(seq, ",usrquota");
307
308 if (test_opt(sb, GRPQUOTA))
309 seq_puts(seq, ",grpquota");
310
311 if (test_opt(sb, XIP))
312 seq_puts(seq, ",xip");
313
314 if (test_opt(sb, DAX))
315 seq_puts(seq, ",dax");
316
317 if (!test_opt(sb, RESERVATION))
318 seq_puts(seq, ",noreservation");
319
320 spin_unlock(&sbi->s_lock);
321 return 0;
322}
323
324#ifdef CONFIG_QUOTA
325static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
326static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
327static int ext2_quota_on(struct super_block *sb, int type, int format_id,
328 const struct path *path);
329static struct dquot **ext2_get_dquots(struct inode *inode)
330{
331 return EXT2_I(inode)->i_dquot;
332}
333
334static const struct quotactl_ops ext2_quotactl_ops = {
335 .quota_on = ext2_quota_on,
336 .quota_off = ext2_quota_off,
337 .quota_sync = dquot_quota_sync,
338 .get_state = dquot_get_state,
339 .set_info = dquot_set_dqinfo,
340 .get_dqblk = dquot_get_dqblk,
341 .set_dqblk = dquot_set_dqblk,
342 .get_nextdqblk = dquot_get_next_dqblk,
343};
344#endif
345
346static const struct super_operations ext2_sops = {
347 .alloc_inode = ext2_alloc_inode,
348 .free_inode = ext2_free_in_core_inode,
349 .write_inode = ext2_write_inode,
350 .evict_inode = ext2_evict_inode,
351 .put_super = ext2_put_super,
352 .sync_fs = ext2_sync_fs,
353 .freeze_fs = ext2_freeze,
354 .unfreeze_fs = ext2_unfreeze,
355 .statfs = ext2_statfs,
356 .remount_fs = ext2_remount,
357 .show_options = ext2_show_options,
358#ifdef CONFIG_QUOTA
359 .quota_read = ext2_quota_read,
360 .quota_write = ext2_quota_write,
361 .get_dquots = ext2_get_dquots,
362#endif
363};
364
365static struct inode *ext2_nfs_get_inode(struct super_block *sb,
366 u64 ino, u32 generation)
367{
368 struct inode *inode;
369
370 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
371 return ERR_PTR(-ESTALE);
372 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
373 return ERR_PTR(-ESTALE);
374
375 /*
376 * ext2_iget isn't quite right if the inode is currently unallocated!
377 * However ext2_iget currently does appropriate checks to handle stale
378 * inodes so everything is OK.
379 */
380 inode = ext2_iget(sb, ino);
381 if (IS_ERR(inode))
382 return ERR_CAST(inode);
383 if (generation && inode->i_generation != generation) {
384 /* we didn't find the right inode.. */
385 iput(inode);
386 return ERR_PTR(-ESTALE);
387 }
388 return inode;
389}
390
391static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid,
392 int fh_len, int fh_type)
393{
394 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
395 ext2_nfs_get_inode);
396}
397
398static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid,
399 int fh_len, int fh_type)
400{
401 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
402 ext2_nfs_get_inode);
403}
404
405static const struct export_operations ext2_export_ops = {
406 .fh_to_dentry = ext2_fh_to_dentry,
407 .fh_to_parent = ext2_fh_to_parent,
408 .get_parent = ext2_get_parent,
409};
410
411static unsigned long get_sb_block(void **data)
412{
413 unsigned long sb_block;
414 char *options = (char *) *data;
415
416 if (!options || strncmp(options, "sb=", 3) != 0)
417 return 1; /* Default location */
418 options += 3;
419 sb_block = simple_strtoul(options, &options, 0);
420 if (*options && *options != ',') {
421 printk("EXT2-fs: Invalid sb specification: %s\n",
422 (char *) *data);
423 return 1;
424 }
425 if (*options == ',')
426 options++;
427 *data = (void *) options;
428 return sb_block;
429}
430
431enum {
432 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
433 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
434 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
435 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
436 Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota,
437 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
438};
439
440static const match_table_t tokens = {
441 {Opt_bsd_df, "bsddf"},
442 {Opt_minix_df, "minixdf"},
443 {Opt_grpid, "grpid"},
444 {Opt_grpid, "bsdgroups"},
445 {Opt_nogrpid, "nogrpid"},
446 {Opt_nogrpid, "sysvgroups"},
447 {Opt_resgid, "resgid=%u"},
448 {Opt_resuid, "resuid=%u"},
449 {Opt_sb, "sb=%u"},
450 {Opt_err_cont, "errors=continue"},
451 {Opt_err_panic, "errors=panic"},
452 {Opt_err_ro, "errors=remount-ro"},
453 {Opt_nouid32, "nouid32"},
454 {Opt_nocheck, "check=none"},
455 {Opt_nocheck, "nocheck"},
456 {Opt_debug, "debug"},
457 {Opt_oldalloc, "oldalloc"},
458 {Opt_orlov, "orlov"},
459 {Opt_nobh, "nobh"},
460 {Opt_user_xattr, "user_xattr"},
461 {Opt_nouser_xattr, "nouser_xattr"},
462 {Opt_acl, "acl"},
463 {Opt_noacl, "noacl"},
464 {Opt_xip, "xip"},
465 {Opt_dax, "dax"},
466 {Opt_grpquota, "grpquota"},
467 {Opt_ignore, "noquota"},
468 {Opt_quota, "quota"},
469 {Opt_usrquota, "usrquota"},
470 {Opt_reservation, "reservation"},
471 {Opt_noreservation, "noreservation"},
472 {Opt_err, NULL}
473};
474
475static int parse_options(char *options, struct super_block *sb,
476 struct ext2_mount_options *opts)
477{
478 char *p;
479 substring_t args[MAX_OPT_ARGS];
480 int option;
481 kuid_t uid;
482 kgid_t gid;
483
484 if (!options)
485 return 1;
486
487 while ((p = strsep (&options, ",")) != NULL) {
488 int token;
489 if (!*p)
490 continue;
491
492 token = match_token(p, tokens, args);
493 switch (token) {
494 case Opt_bsd_df:
495 clear_opt (opts->s_mount_opt, MINIX_DF);
496 break;
497 case Opt_minix_df:
498 set_opt (opts->s_mount_opt, MINIX_DF);
499 break;
500 case Opt_grpid:
501 set_opt (opts->s_mount_opt, GRPID);
502 break;
503 case Opt_nogrpid:
504 clear_opt (opts->s_mount_opt, GRPID);
505 break;
506 case Opt_resuid:
507 if (match_int(&args[0], &option))
508 return 0;
509 uid = make_kuid(current_user_ns(), option);
510 if (!uid_valid(uid)) {
511 ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option);
512 return 0;
513
514 }
515 opts->s_resuid = uid;
516 break;
517 case Opt_resgid:
518 if (match_int(&args[0], &option))
519 return 0;
520 gid = make_kgid(current_user_ns(), option);
521 if (!gid_valid(gid)) {
522 ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option);
523 return 0;
524 }
525 opts->s_resgid = gid;
526 break;
527 case Opt_sb:
528 /* handled by get_sb_block() instead of here */
529 /* *sb_block = match_int(&args[0]); */
530 break;
531 case Opt_err_panic:
532 clear_opt (opts->s_mount_opt, ERRORS_CONT);
533 clear_opt (opts->s_mount_opt, ERRORS_RO);
534 set_opt (opts->s_mount_opt, ERRORS_PANIC);
535 break;
536 case Opt_err_ro:
537 clear_opt (opts->s_mount_opt, ERRORS_CONT);
538 clear_opt (opts->s_mount_opt, ERRORS_PANIC);
539 set_opt (opts->s_mount_opt, ERRORS_RO);
540 break;
541 case Opt_err_cont:
542 clear_opt (opts->s_mount_opt, ERRORS_RO);
543 clear_opt (opts->s_mount_opt, ERRORS_PANIC);
544 set_opt (opts->s_mount_opt, ERRORS_CONT);
545 break;
546 case Opt_nouid32:
547 set_opt (opts->s_mount_opt, NO_UID32);
548 break;
549 case Opt_nocheck:
550 ext2_msg(sb, KERN_WARNING,
551 "Option nocheck/check=none is deprecated and"
552 " will be removed in June 2020.");
553 clear_opt (opts->s_mount_opt, CHECK);
554 break;
555 case Opt_debug:
556 set_opt (opts->s_mount_opt, DEBUG);
557 break;
558 case Opt_oldalloc:
559 set_opt (opts->s_mount_opt, OLDALLOC);
560 break;
561 case Opt_orlov:
562 clear_opt (opts->s_mount_opt, OLDALLOC);
563 break;
564 case Opt_nobh:
565 set_opt (opts->s_mount_opt, NOBH);
566 break;
567#ifdef CONFIG_EXT2_FS_XATTR
568 case Opt_user_xattr:
569 set_opt (opts->s_mount_opt, XATTR_USER);
570 break;
571 case Opt_nouser_xattr:
572 clear_opt (opts->s_mount_opt, XATTR_USER);
573 break;
574#else
575 case Opt_user_xattr:
576 case Opt_nouser_xattr:
577 ext2_msg(sb, KERN_INFO, "(no)user_xattr options"
578 "not supported");
579 break;
580#endif
581#ifdef CONFIG_EXT2_FS_POSIX_ACL
582 case Opt_acl:
583 set_opt(opts->s_mount_opt, POSIX_ACL);
584 break;
585 case Opt_noacl:
586 clear_opt(opts->s_mount_opt, POSIX_ACL);
587 break;
588#else
589 case Opt_acl:
590 case Opt_noacl:
591 ext2_msg(sb, KERN_INFO,
592 "(no)acl options not supported");
593 break;
594#endif
595 case Opt_xip:
596 ext2_msg(sb, KERN_INFO, "use dax instead of xip");
597 set_opt(opts->s_mount_opt, XIP);
598 /* Fall through */
599 case Opt_dax:
600#ifdef CONFIG_FS_DAX
601 ext2_msg(sb, KERN_WARNING,
602 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
603 set_opt(opts->s_mount_opt, DAX);
604#else
605 ext2_msg(sb, KERN_INFO, "dax option not supported");
606#endif
607 break;
608
609#if defined(CONFIG_QUOTA)
610 case Opt_quota:
611 case Opt_usrquota:
612 set_opt(opts->s_mount_opt, USRQUOTA);
613 break;
614
615 case Opt_grpquota:
616 set_opt(opts->s_mount_opt, GRPQUOTA);
617 break;
618#else
619 case Opt_quota:
620 case Opt_usrquota:
621 case Opt_grpquota:
622 ext2_msg(sb, KERN_INFO,
623 "quota operations not supported");
624 break;
625#endif
626
627 case Opt_reservation:
628 set_opt(opts->s_mount_opt, RESERVATION);
629 ext2_msg(sb, KERN_INFO, "reservations ON");
630 break;
631 case Opt_noreservation:
632 clear_opt(opts->s_mount_opt, RESERVATION);
633 ext2_msg(sb, KERN_INFO, "reservations OFF");
634 break;
635 case Opt_ignore:
636 break;
637 default:
638 return 0;
639 }
640 }
641 return 1;
642}
643
644static int ext2_setup_super (struct super_block * sb,
645 struct ext2_super_block * es,
646 int read_only)
647{
648 int res = 0;
649 struct ext2_sb_info *sbi = EXT2_SB(sb);
650
651 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
652 ext2_msg(sb, KERN_ERR,
653 "error: revision level too high, "
654 "forcing read-only mode");
655 res = SB_RDONLY;
656 }
657 if (read_only)
658 return res;
659 if (!(sbi->s_mount_state & EXT2_VALID_FS))
660 ext2_msg(sb, KERN_WARNING,
661 "warning: mounting unchecked fs, "
662 "running e2fsck is recommended");
663 else if ((sbi->s_mount_state & EXT2_ERROR_FS))
664 ext2_msg(sb, KERN_WARNING,
665 "warning: mounting fs with errors, "
666 "running e2fsck is recommended");
667 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
668 le16_to_cpu(es->s_mnt_count) >=
669 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
670 ext2_msg(sb, KERN_WARNING,
671 "warning: maximal mount count reached, "
672 "running e2fsck is recommended");
673 else if (le32_to_cpu(es->s_checkinterval) &&
674 (le32_to_cpu(es->s_lastcheck) +
675 le32_to_cpu(es->s_checkinterval) <=
676 ktime_get_real_seconds()))
677 ext2_msg(sb, KERN_WARNING,
678 "warning: checktime reached, "
679 "running e2fsck is recommended");
680 if (!le16_to_cpu(es->s_max_mnt_count))
681 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
682 le16_add_cpu(&es->s_mnt_count, 1);
683 if (test_opt (sb, DEBUG))
684 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, "
685 "bpg=%lu, ipg=%lu, mo=%04lx]",
686 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
687 sbi->s_frag_size,
688 sbi->s_groups_count,
689 EXT2_BLOCKS_PER_GROUP(sb),
690 EXT2_INODES_PER_GROUP(sb),
691 sbi->s_mount_opt);
692 return res;
693}
694
695static int ext2_check_descriptors(struct super_block *sb)
696{
697 int i;
698 struct ext2_sb_info *sbi = EXT2_SB(sb);
699
700 ext2_debug ("Checking group descriptors");
701
702 for (i = 0; i < sbi->s_groups_count; i++) {
703 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL);
704 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i);
705 ext2_fsblk_t last_block;
706
707 if (i == sbi->s_groups_count - 1)
708 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
709 else
710 last_block = first_block +
711 (EXT2_BLOCKS_PER_GROUP(sb) - 1);
712
713 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
714 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
715 {
716 ext2_error (sb, "ext2_check_descriptors",
717 "Block bitmap for group %d"
718 " not in group (block %lu)!",
719 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap));
720 return 0;
721 }
722 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
723 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
724 {
725 ext2_error (sb, "ext2_check_descriptors",
726 "Inode bitmap for group %d"
727 " not in group (block %lu)!",
728 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap));
729 return 0;
730 }
731 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
732 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
733 last_block)
734 {
735 ext2_error (sb, "ext2_check_descriptors",
736 "Inode table for group %d"
737 " not in group (block %lu)!",
738 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table));
739 return 0;
740 }
741 }
742 return 1;
743}
744
745/*
746 * Maximal file size. There is a direct, and {,double-,triple-}indirect
747 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
748 * We need to be 1 filesystem block less than the 2^32 sector limit.
749 */
750static loff_t ext2_max_size(int bits)
751{
752 loff_t res = EXT2_NDIR_BLOCKS;
753 int meta_blocks;
754 unsigned int upper_limit;
755 unsigned int ppb = 1 << (bits-2);
756
757 /* This is calculated to be the largest file size for a
758 * dense, file such that the total number of
759 * sectors in the file, including data and all indirect blocks,
760 * does not exceed 2^32 -1
761 * __u32 i_blocks representing the total number of
762 * 512 bytes blocks of the file
763 */
764 upper_limit = (1LL << 32) - 1;
765
766 /* total blocks in file system block size */
767 upper_limit >>= (bits - 9);
768
769 /* Compute how many blocks we can address by block tree */
770 res += 1LL << (bits-2);
771 res += 1LL << (2*(bits-2));
772 res += 1LL << (3*(bits-2));
773 /* Does block tree limit file size? */
774 if (res < upper_limit)
775 goto check_lfs;
776
777 res = upper_limit;
778 /* How many metadata blocks are needed for addressing upper_limit? */
779 upper_limit -= EXT2_NDIR_BLOCKS;
780 /* indirect blocks */
781 meta_blocks = 1;
782 upper_limit -= ppb;
783 /* double indirect blocks */
784 if (upper_limit < ppb * ppb) {
785 meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb);
786 res -= meta_blocks;
787 goto check_lfs;
788 }
789 meta_blocks += 1 + ppb;
790 upper_limit -= ppb * ppb;
791 /* tripple indirect blocks for the rest */
792 meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb) +
793 DIV_ROUND_UP(upper_limit, ppb*ppb);
794 res -= meta_blocks;
795check_lfs:
796 res <<= bits;
797 if (res > MAX_LFS_FILESIZE)
798 res = MAX_LFS_FILESIZE;
799
800 return res;
801}
802
803static unsigned long descriptor_loc(struct super_block *sb,
804 unsigned long logic_sb_block,
805 int nr)
806{
807 struct ext2_sb_info *sbi = EXT2_SB(sb);
808 unsigned long bg, first_meta_bg;
809 int has_super = 0;
810
811 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
812
813 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
814 nr < first_meta_bg)
815 return (logic_sb_block + nr + 1);
816 bg = sbi->s_desc_per_block * nr;
817 if (ext2_bg_has_super(sb, bg))
818 has_super = 1;
819
820 return ext2_group_first_block_no(sb, bg) + has_super;
821}
822
823static int ext2_fill_super(struct super_block *sb, void *data, int silent)
824{
825 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
826 struct buffer_head * bh;
827 struct ext2_sb_info * sbi;
828 struct ext2_super_block * es;
829 struct inode *root;
830 unsigned long block;
831 unsigned long sb_block = get_sb_block(&data);
832 unsigned long logic_sb_block;
833 unsigned long offset = 0;
834 unsigned long def_mount_opts;
835 long ret = -ENOMEM;
836 int blocksize = BLOCK_SIZE;
837 int db_count;
838 int i, j;
839 __le32 features;
840 int err;
841 struct ext2_mount_options opts;
842
843 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
844 if (!sbi)
845 goto failed;
846
847 sbi->s_blockgroup_lock =
848 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
849 if (!sbi->s_blockgroup_lock) {
850 kfree(sbi);
851 goto failed;
852 }
853 sb->s_fs_info = sbi;
854 sbi->s_sb_block = sb_block;
855 sbi->s_daxdev = dax_dev;
856
857 spin_lock_init(&sbi->s_lock);
858 ret = -EINVAL;
859
860 /*
861 * See what the current blocksize for the device is, and
862 * use that as the blocksize. Otherwise (or if the blocksize
863 * is smaller than the default) use the default.
864 * This is important for devices that have a hardware
865 * sectorsize that is larger than the default.
866 */
867 blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
868 if (!blocksize) {
869 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize");
870 goto failed_sbi;
871 }
872
873 /*
874 * If the superblock doesn't start on a hardware sector boundary,
875 * calculate the offset.
876 */
877 if (blocksize != BLOCK_SIZE) {
878 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
879 offset = (sb_block*BLOCK_SIZE) % blocksize;
880 } else {
881 logic_sb_block = sb_block;
882 }
883
884 if (!(bh = sb_bread(sb, logic_sb_block))) {
885 ext2_msg(sb, KERN_ERR, "error: unable to read superblock");
886 goto failed_sbi;
887 }
888 /*
889 * Note: s_es must be initialized as soon as possible because
890 * some ext2 macro-instructions depend on its value
891 */
892 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
893 sbi->s_es = es;
894 sb->s_magic = le16_to_cpu(es->s_magic);
895
896 if (sb->s_magic != EXT2_SUPER_MAGIC)
897 goto cantfind_ext2;
898
899 opts.s_mount_opt = 0;
900 /* Set defaults before we parse the mount options */
901 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
902 if (def_mount_opts & EXT2_DEFM_DEBUG)
903 set_opt(opts.s_mount_opt, DEBUG);
904 if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
905 set_opt(opts.s_mount_opt, GRPID);
906 if (def_mount_opts & EXT2_DEFM_UID16)
907 set_opt(opts.s_mount_opt, NO_UID32);
908#ifdef CONFIG_EXT2_FS_XATTR
909 if (def_mount_opts & EXT2_DEFM_XATTR_USER)
910 set_opt(opts.s_mount_opt, XATTR_USER);
911#endif
912#ifdef CONFIG_EXT2_FS_POSIX_ACL
913 if (def_mount_opts & EXT2_DEFM_ACL)
914 set_opt(opts.s_mount_opt, POSIX_ACL);
915#endif
916
917 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
918 set_opt(opts.s_mount_opt, ERRORS_PANIC);
919 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
920 set_opt(opts.s_mount_opt, ERRORS_CONT);
921 else
922 set_opt(opts.s_mount_opt, ERRORS_RO);
923
924 opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
925 opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
926
927 set_opt(opts.s_mount_opt, RESERVATION);
928
929 if (!parse_options((char *) data, sb, &opts))
930 goto failed_mount;
931
932 sbi->s_mount_opt = opts.s_mount_opt;
933 sbi->s_resuid = opts.s_resuid;
934 sbi->s_resgid = opts.s_resgid;
935
936 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
937 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
938 sb->s_iflags |= SB_I_CGROUPWB;
939
940 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
941 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
942 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
943 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
944 ext2_msg(sb, KERN_WARNING,
945 "warning: feature flags set on rev 0 fs, "
946 "running e2fsck is recommended");
947 /*
948 * Check feature flags regardless of the revision level, since we
949 * previously didn't change the revision level when setting the flags,
950 * so there is a chance incompat flags are set on a rev 0 filesystem.
951 */
952 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
953 if (features) {
954 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of "
955 "unsupported optional features (%x)",
956 le32_to_cpu(features));
957 goto failed_mount;
958 }
959 if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
960 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of "
961 "unsupported optional features (%x)",
962 le32_to_cpu(features));
963 goto failed_mount;
964 }
965
966 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
967
968 if (test_opt(sb, DAX)) {
969 if (!bdev_dax_supported(sb->s_bdev, blocksize)) {
970 ext2_msg(sb, KERN_ERR,
971 "DAX unsupported by block device. Turning off DAX.");
972 clear_opt(sbi->s_mount_opt, DAX);
973 }
974 }
975
976 /* If the blocksize doesn't match, re-read the thing.. */
977 if (sb->s_blocksize != blocksize) {
978 brelse(bh);
979
980 if (!sb_set_blocksize(sb, blocksize)) {
981 ext2_msg(sb, KERN_ERR,
982 "error: bad blocksize %d", blocksize);
983 goto failed_sbi;
984 }
985
986 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
987 offset = (sb_block*BLOCK_SIZE) % blocksize;
988 bh = sb_bread(sb, logic_sb_block);
989 if(!bh) {
990 ext2_msg(sb, KERN_ERR, "error: couldn't read"
991 "superblock on 2nd try");
992 goto failed_sbi;
993 }
994 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
995 sbi->s_es = es;
996 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
997 ext2_msg(sb, KERN_ERR, "error: magic mismatch");
998 goto failed_mount;
999 }
1000 }
1001
1002 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
1003 sb->s_max_links = EXT2_LINK_MAX;
1004 sb->s_time_min = S32_MIN;
1005 sb->s_time_max = S32_MAX;
1006
1007 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
1008 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
1009 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
1010 } else {
1011 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1012 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1013 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
1014 !is_power_of_2(sbi->s_inode_size) ||
1015 (sbi->s_inode_size > blocksize)) {
1016 ext2_msg(sb, KERN_ERR,
1017 "error: unsupported inode size: %d",
1018 sbi->s_inode_size);
1019 goto failed_mount;
1020 }
1021 }
1022
1023 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
1024 le32_to_cpu(es->s_log_frag_size);
1025 if (sbi->s_frag_size == 0)
1026 goto cantfind_ext2;
1027 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
1028
1029 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1030 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1031 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1032
1033 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
1034 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
1035 goto cantfind_ext2;
1036 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1037 sbi->s_inodes_per_block;
1038 sbi->s_desc_per_block = sb->s_blocksize /
1039 sizeof (struct ext2_group_desc);
1040 sbi->s_sbh = bh;
1041 sbi->s_mount_state = le16_to_cpu(es->s_state);
1042 sbi->s_addr_per_block_bits =
1043 ilog2 (EXT2_ADDR_PER_BLOCK(sb));
1044 sbi->s_desc_per_block_bits =
1045 ilog2 (EXT2_DESC_PER_BLOCK(sb));
1046
1047 if (sb->s_magic != EXT2_SUPER_MAGIC)
1048 goto cantfind_ext2;
1049
1050 if (sb->s_blocksize != bh->b_size) {
1051 if (!silent)
1052 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize");
1053 goto failed_mount;
1054 }
1055
1056 if (sb->s_blocksize != sbi->s_frag_size) {
1057 ext2_msg(sb, KERN_ERR,
1058 "error: fragsize %lu != blocksize %lu"
1059 "(not supported yet)",
1060 sbi->s_frag_size, sb->s_blocksize);
1061 goto failed_mount;
1062 }
1063
1064 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
1065 ext2_msg(sb, KERN_ERR,
1066 "error: #blocks per group too big: %lu",
1067 sbi->s_blocks_per_group);
1068 goto failed_mount;
1069 }
1070 if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
1071 ext2_msg(sb, KERN_ERR,
1072 "error: #fragments per group too big: %lu",
1073 sbi->s_frags_per_group);
1074 goto failed_mount;
1075 }
1076 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
1077 ext2_msg(sb, KERN_ERR,
1078 "error: #inodes per group too big: %lu",
1079 sbi->s_inodes_per_group);
1080 goto failed_mount;
1081 }
1082
1083 if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
1084 goto cantfind_ext2;
1085 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1086 le32_to_cpu(es->s_first_data_block) - 1)
1087 / EXT2_BLOCKS_PER_GROUP(sb)) + 1;
1088 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
1089 EXT2_DESC_PER_BLOCK(sb);
1090 sbi->s_group_desc = kmalloc_array (db_count,
1091 sizeof(struct buffer_head *),
1092 GFP_KERNEL);
1093 if (sbi->s_group_desc == NULL) {
1094 ret = -ENOMEM;
1095 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1096 goto failed_mount;
1097 }
1098 bgl_lock_init(sbi->s_blockgroup_lock);
1099 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
1100 if (!sbi->s_debts) {
1101 ret = -ENOMEM;
1102 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1103 goto failed_mount_group_desc;
1104 }
1105 for (i = 0; i < db_count; i++) {
1106 block = descriptor_loc(sb, logic_sb_block, i);
1107 sbi->s_group_desc[i] = sb_bread(sb, block);
1108 if (!sbi->s_group_desc[i]) {
1109 for (j = 0; j < i; j++)
1110 brelse (sbi->s_group_desc[j]);
1111 ext2_msg(sb, KERN_ERR,
1112 "error: unable to read group descriptors");
1113 goto failed_mount_group_desc;
1114 }
1115 }
1116 if (!ext2_check_descriptors (sb)) {
1117 ext2_msg(sb, KERN_ERR, "group descriptors corrupted");
1118 goto failed_mount2;
1119 }
1120 sbi->s_gdb_count = db_count;
1121 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1122 spin_lock_init(&sbi->s_next_gen_lock);
1123
1124 /* per fileystem reservation list head & lock */
1125 spin_lock_init(&sbi->s_rsv_window_lock);
1126 sbi->s_rsv_window_root = RB_ROOT;
1127 /*
1128 * Add a single, static dummy reservation to the start of the
1129 * reservation window list --- it gives us a placeholder for
1130 * append-at-start-of-list which makes the allocation logic
1131 * _much_ simpler.
1132 */
1133 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1134 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1135 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1136 sbi->s_rsv_window_head.rsv_goal_size = 0;
1137 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head);
1138
1139 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1140 ext2_count_free_blocks(sb), GFP_KERNEL);
1141 if (!err) {
1142 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1143 ext2_count_free_inodes(sb), GFP_KERNEL);
1144 }
1145 if (!err) {
1146 err = percpu_counter_init(&sbi->s_dirs_counter,
1147 ext2_count_dirs(sb), GFP_KERNEL);
1148 }
1149 if (err) {
1150 ext2_msg(sb, KERN_ERR, "error: insufficient memory");
1151 goto failed_mount3;
1152 }
1153
1154#ifdef CONFIG_EXT2_FS_XATTR
1155 sbi->s_ea_block_cache = ext2_xattr_create_cache();
1156 if (!sbi->s_ea_block_cache) {
1157 ret = -ENOMEM;
1158 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache");
1159 goto failed_mount3;
1160 }
1161#endif
1162 /*
1163 * set up enough so that it can read an inode
1164 */
1165 sb->s_op = &ext2_sops;
1166 sb->s_export_op = &ext2_export_ops;
1167 sb->s_xattr = ext2_xattr_handlers;
1168
1169#ifdef CONFIG_QUOTA
1170 sb->dq_op = &dquot_operations;
1171 sb->s_qcop = &ext2_quotactl_ops;
1172 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1173#endif
1174
1175 root = ext2_iget(sb, EXT2_ROOT_INO);
1176 if (IS_ERR(root)) {
1177 ret = PTR_ERR(root);
1178 goto failed_mount3;
1179 }
1180 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1181 iput(root);
1182 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
1183 goto failed_mount3;
1184 }
1185
1186 sb->s_root = d_make_root(root);
1187 if (!sb->s_root) {
1188 ext2_msg(sb, KERN_ERR, "error: get root inode failed");
1189 ret = -ENOMEM;
1190 goto failed_mount3;
1191 }
1192 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
1193 ext2_msg(sb, KERN_WARNING,
1194 "warning: mounting ext3 filesystem as ext2");
1195 if (ext2_setup_super (sb, es, sb_rdonly(sb)))
1196 sb->s_flags |= SB_RDONLY;
1197 ext2_write_super(sb);
1198 return 0;
1199
1200cantfind_ext2:
1201 if (!silent)
1202 ext2_msg(sb, KERN_ERR,
1203 "error: can't find an ext2 filesystem on dev %s.",
1204 sb->s_id);
1205 goto failed_mount;
1206failed_mount3:
1207 ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
1208 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1209 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1210 percpu_counter_destroy(&sbi->s_dirs_counter);
1211failed_mount2:
1212 for (i = 0; i < db_count; i++)
1213 brelse(sbi->s_group_desc[i]);
1214failed_mount_group_desc:
1215 kfree(sbi->s_group_desc);
1216 kfree(sbi->s_debts);
1217failed_mount:
1218 brelse(bh);
1219failed_sbi:
1220 sb->s_fs_info = NULL;
1221 kfree(sbi->s_blockgroup_lock);
1222 kfree(sbi);
1223failed:
1224 fs_put_dax(dax_dev);
1225 return ret;
1226}
1227
1228static void ext2_clear_super_error(struct super_block *sb)
1229{
1230 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh;
1231
1232 if (buffer_write_io_error(sbh)) {
1233 /*
1234 * Oh, dear. A previous attempt to write the
1235 * superblock failed. This could happen because the
1236 * USB device was yanked out. Or it could happen to
1237 * be a transient write error and maybe the block will
1238 * be remapped. Nothing we can do but to retry the
1239 * write and hope for the best.
1240 */
1241 ext2_msg(sb, KERN_ERR,
1242 "previous I/O error to superblock detected");
1243 clear_buffer_write_io_error(sbh);
1244 set_buffer_uptodate(sbh);
1245 }
1246}
1247
1248void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
1249 int wait)
1250{
1251 ext2_clear_super_error(sb);
1252 spin_lock(&EXT2_SB(sb)->s_lock);
1253 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1254 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1255 es->s_wtime = cpu_to_le32(ktime_get_real_seconds());
1256 /* unlock before we do IO */
1257 spin_unlock(&EXT2_SB(sb)->s_lock);
1258 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
1259 if (wait)
1260 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
1261}
1262
1263/*
1264 * In the second extended file system, it is not necessary to
1265 * write the super block since we use a mapping of the
1266 * disk super block in a buffer.
1267 *
1268 * However, this function is still used to set the fs valid
1269 * flags to 0. We need to set this flag to 0 since the fs
1270 * may have been checked while mounted and e2fsck may have
1271 * set s_state to EXT2_VALID_FS after some corrections.
1272 */
1273static int ext2_sync_fs(struct super_block *sb, int wait)
1274{
1275 struct ext2_sb_info *sbi = EXT2_SB(sb);
1276 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
1277
1278 /*
1279 * Write quota structures to quota file, sync_blockdev() will write
1280 * them to disk later
1281 */
1282 dquot_writeback_dquots(sb, -1);
1283
1284 spin_lock(&sbi->s_lock);
1285 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) {
1286 ext2_debug("setting valid to 0\n");
1287 es->s_state &= cpu_to_le16(~EXT2_VALID_FS);
1288 }
1289 spin_unlock(&sbi->s_lock);
1290 ext2_sync_super(sb, es, wait);
1291 return 0;
1292}
1293
1294static int ext2_freeze(struct super_block *sb)
1295{
1296 struct ext2_sb_info *sbi = EXT2_SB(sb);
1297
1298 /*
1299 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared
1300 * because we have unattached inodes and thus filesystem is not fully
1301 * consistent.
1302 */
1303 if (atomic_long_read(&sb->s_remove_count)) {
1304 ext2_sync_fs(sb, 1);
1305 return 0;
1306 }
1307 /* Set EXT2_FS_VALID flag */
1308 spin_lock(&sbi->s_lock);
1309 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state);
1310 spin_unlock(&sbi->s_lock);
1311 ext2_sync_super(sb, sbi->s_es, 1);
1312
1313 return 0;
1314}
1315
1316static int ext2_unfreeze(struct super_block *sb)
1317{
1318 /* Just write sb to clear EXT2_VALID_FS flag */
1319 ext2_write_super(sb);
1320
1321 return 0;
1322}
1323
1324static void ext2_write_super(struct super_block *sb)
1325{
1326 if (!sb_rdonly(sb))
1327 ext2_sync_fs(sb, 1);
1328}
1329
1330static int ext2_remount (struct super_block * sb, int * flags, char * data)
1331{
1332 struct ext2_sb_info * sbi = EXT2_SB(sb);
1333 struct ext2_super_block * es;
1334 struct ext2_mount_options new_opts;
1335 int err;
1336
1337 sync_filesystem(sb);
1338
1339 spin_lock(&sbi->s_lock);
1340 new_opts.s_mount_opt = sbi->s_mount_opt;
1341 new_opts.s_resuid = sbi->s_resuid;
1342 new_opts.s_resgid = sbi->s_resgid;
1343 spin_unlock(&sbi->s_lock);
1344
1345 if (!parse_options(data, sb, &new_opts))
1346 return -EINVAL;
1347
1348 spin_lock(&sbi->s_lock);
1349 es = sbi->s_es;
1350 if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) {
1351 ext2_msg(sb, KERN_WARNING, "warning: refusing change of "
1352 "dax flag with busy inodes while remounting");
1353 new_opts.s_mount_opt ^= EXT2_MOUNT_DAX;
1354 }
1355 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
1356 goto out_set;
1357 if (*flags & SB_RDONLY) {
1358 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
1359 !(sbi->s_mount_state & EXT2_VALID_FS))
1360 goto out_set;
1361
1362 /*
1363 * OK, we are remounting a valid rw partition rdonly, so set
1364 * the rdonly flag and then mark the partition as valid again.
1365 */
1366 es->s_state = cpu_to_le16(sbi->s_mount_state);
1367 es->s_mtime = cpu_to_le32(ktime_get_real_seconds());
1368 spin_unlock(&sbi->s_lock);
1369
1370 err = dquot_suspend(sb, -1);
1371 if (err < 0)
1372 return err;
1373
1374 ext2_sync_super(sb, es, 1);
1375 } else {
1376 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
1377 ~EXT2_FEATURE_RO_COMPAT_SUPP);
1378 if (ret) {
1379 spin_unlock(&sbi->s_lock);
1380 ext2_msg(sb, KERN_WARNING,
1381 "warning: couldn't remount RDWR because of "
1382 "unsupported optional features (%x).",
1383 le32_to_cpu(ret));
1384 return -EROFS;
1385 }
1386 /*
1387 * Mounting a RDONLY partition read-write, so reread and
1388 * store the current valid flag. (It may have been changed
1389 * by e2fsck since we originally mounted the partition.)
1390 */
1391 sbi->s_mount_state = le16_to_cpu(es->s_state);
1392 if (!ext2_setup_super (sb, es, 0))
1393 sb->s_flags &= ~SB_RDONLY;
1394 spin_unlock(&sbi->s_lock);
1395
1396 ext2_write_super(sb);
1397
1398 dquot_resume(sb, -1);
1399 }
1400
1401 spin_lock(&sbi->s_lock);
1402out_set:
1403 sbi->s_mount_opt = new_opts.s_mount_opt;
1404 sbi->s_resuid = new_opts.s_resuid;
1405 sbi->s_resgid = new_opts.s_resgid;
1406 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
1407 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
1408 spin_unlock(&sbi->s_lock);
1409
1410 return 0;
1411}
1412
1413static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
1414{
1415 struct super_block *sb = dentry->d_sb;
1416 struct ext2_sb_info *sbi = EXT2_SB(sb);
1417 struct ext2_super_block *es = sbi->s_es;
1418 u64 fsid;
1419
1420 spin_lock(&sbi->s_lock);
1421
1422 if (test_opt (sb, MINIX_DF))
1423 sbi->s_overhead_last = 0;
1424 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
1425 unsigned long i, overhead = 0;
1426 smp_rmb();
1427
1428 /*
1429 * Compute the overhead (FS structures). This is constant
1430 * for a given filesystem unless the number of block groups
1431 * changes so we cache the previous value until it does.
1432 */
1433
1434 /*
1435 * All of the blocks before first_data_block are
1436 * overhead
1437 */
1438 overhead = le32_to_cpu(es->s_first_data_block);
1439
1440 /*
1441 * Add the overhead attributed to the superblock and
1442 * block group descriptors. If the sparse superblocks
1443 * feature is turned on, then not all groups have this.
1444 */
1445 for (i = 0; i < sbi->s_groups_count; i++)
1446 overhead += ext2_bg_has_super(sb, i) +
1447 ext2_bg_num_gdb(sb, i);
1448
1449 /*
1450 * Every block group has an inode bitmap, a block
1451 * bitmap, and an inode table.
1452 */
1453 overhead += (sbi->s_groups_count *
1454 (2 + sbi->s_itb_per_group));
1455 sbi->s_overhead_last = overhead;
1456 smp_wmb();
1457 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1458 }
1459
1460 buf->f_type = EXT2_SUPER_MAGIC;
1461 buf->f_bsize = sb->s_blocksize;
1462 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
1463 buf->f_bfree = ext2_count_free_blocks(sb);
1464 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
1465 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
1466 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
1467 buf->f_bavail = 0;
1468 buf->f_files = le32_to_cpu(es->s_inodes_count);
1469 buf->f_ffree = ext2_count_free_inodes(sb);
1470 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
1471 buf->f_namelen = EXT2_NAME_LEN;
1472 fsid = le64_to_cpup((void *)es->s_uuid) ^
1473 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
1474 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
1475 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1476 spin_unlock(&sbi->s_lock);
1477 return 0;
1478}
1479
1480static struct dentry *ext2_mount(struct file_system_type *fs_type,
1481 int flags, const char *dev_name, void *data)
1482{
1483 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super);
1484}
1485
1486#ifdef CONFIG_QUOTA
1487
1488/* Read data from quotafile - avoid pagecache and such because we cannot afford
1489 * acquiring the locks... As quota files are never truncated and quota code
1490 * itself serializes the operations (and no one else should touch the files)
1491 * we don't have to be afraid of races */
1492static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
1493 size_t len, loff_t off)
1494{
1495 struct inode *inode = sb_dqopt(sb)->files[type];
1496 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1497 int err = 0;
1498 int offset = off & (sb->s_blocksize - 1);
1499 int tocopy;
1500 size_t toread;
1501 struct buffer_head tmp_bh;
1502 struct buffer_head *bh;
1503 loff_t i_size = i_size_read(inode);
1504
1505 if (off > i_size)
1506 return 0;
1507 if (off+len > i_size)
1508 len = i_size-off;
1509 toread = len;
1510 while (toread > 0) {
1511 tocopy = sb->s_blocksize - offset < toread ?
1512 sb->s_blocksize - offset : toread;
1513
1514 tmp_bh.b_state = 0;
1515 tmp_bh.b_size = sb->s_blocksize;
1516 err = ext2_get_block(inode, blk, &tmp_bh, 0);
1517 if (err < 0)
1518 return err;
1519 if (!buffer_mapped(&tmp_bh)) /* A hole? */
1520 memset(data, 0, tocopy);
1521 else {
1522 bh = sb_bread(sb, tmp_bh.b_blocknr);
1523 if (!bh)
1524 return -EIO;
1525 memcpy(data, bh->b_data+offset, tocopy);
1526 brelse(bh);
1527 }
1528 offset = 0;
1529 toread -= tocopy;
1530 data += tocopy;
1531 blk++;
1532 }
1533 return len;
1534}
1535
1536/* Write to quotafile */
1537static ssize_t ext2_quota_write(struct super_block *sb, int type,
1538 const char *data, size_t len, loff_t off)
1539{
1540 struct inode *inode = sb_dqopt(sb)->files[type];
1541 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1542 int err = 0;
1543 int offset = off & (sb->s_blocksize - 1);
1544 int tocopy;
1545 size_t towrite = len;
1546 struct buffer_head tmp_bh;
1547 struct buffer_head *bh;
1548
1549 while (towrite > 0) {
1550 tocopy = sb->s_blocksize - offset < towrite ?
1551 sb->s_blocksize - offset : towrite;
1552
1553 tmp_bh.b_state = 0;
1554 tmp_bh.b_size = sb->s_blocksize;
1555 err = ext2_get_block(inode, blk, &tmp_bh, 1);
1556 if (err < 0)
1557 goto out;
1558 if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
1559 bh = sb_bread(sb, tmp_bh.b_blocknr);
1560 else
1561 bh = sb_getblk(sb, tmp_bh.b_blocknr);
1562 if (unlikely(!bh)) {
1563 err = -EIO;
1564 goto out;
1565 }
1566 lock_buffer(bh);
1567 memcpy(bh->b_data+offset, data, tocopy);
1568 flush_dcache_page(bh->b_page);
1569 set_buffer_uptodate(bh);
1570 mark_buffer_dirty(bh);
1571 unlock_buffer(bh);
1572 brelse(bh);
1573 offset = 0;
1574 towrite -= tocopy;
1575 data += tocopy;
1576 blk++;
1577 }
1578out:
1579 if (len == towrite)
1580 return err;
1581 if (inode->i_size < off+len-towrite)
1582 i_size_write(inode, off+len-towrite);
1583 inode_inc_iversion(inode);
1584 inode->i_mtime = inode->i_ctime = current_time(inode);
1585 mark_inode_dirty(inode);
1586 return len - towrite;
1587}
1588
1589static int ext2_quota_on(struct super_block *sb, int type, int format_id,
1590 const struct path *path)
1591{
1592 int err;
1593 struct inode *inode;
1594
1595 err = dquot_quota_on(sb, type, format_id, path);
1596 if (err)
1597 return err;
1598
1599 inode = d_inode(path->dentry);
1600 inode_lock(inode);
1601 EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL;
1602 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
1603 S_NOATIME | S_IMMUTABLE);
1604 inode_unlock(inode);
1605 mark_inode_dirty(inode);
1606
1607 return 0;
1608}
1609
1610static int ext2_quota_off(struct super_block *sb, int type)
1611{
1612 struct inode *inode = sb_dqopt(sb)->files[type];
1613 int err;
1614
1615 if (!inode || !igrab(inode))
1616 goto out;
1617
1618 err = dquot_quota_off(sb, type);
1619 if (err)
1620 goto out_put;
1621
1622 inode_lock(inode);
1623 EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL);
1624 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
1625 inode_unlock(inode);
1626 mark_inode_dirty(inode);
1627out_put:
1628 iput(inode);
1629 return err;
1630out:
1631 return dquot_quota_off(sb, type);
1632}
1633
1634#endif
1635
1636static struct file_system_type ext2_fs_type = {
1637 .owner = THIS_MODULE,
1638 .name = "ext2",
1639 .mount = ext2_mount,
1640 .kill_sb = kill_block_super,
1641 .fs_flags = FS_REQUIRES_DEV,
1642};
1643MODULE_ALIAS_FS("ext2");
1644
1645static int __init init_ext2_fs(void)
1646{
1647 int err;
1648
1649 err = init_inodecache();
1650 if (err)
1651 return err;
1652 err = register_filesystem(&ext2_fs_type);
1653 if (err)
1654 goto out;
1655 return 0;
1656out:
1657 destroy_inodecache();
1658 return err;
1659}
1660
1661static void __exit exit_ext2_fs(void)
1662{
1663 unregister_filesystem(&ext2_fs_type);
1664 destroy_inodecache();
1665}
1666
1667MODULE_AUTHOR("Remy Card and others");
1668MODULE_DESCRIPTION("Second Extended Filesystem");
1669MODULE_LICENSE("GPL");
1670module_init(init_ext2_fs)
1671module_exit(exit_ext2_fs)
1/*
2 * linux/fs/ext2/super.c
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/slab.h>
23#include <linux/init.h>
24#include <linux/blkdev.h>
25#include <linux/parser.h>
26#include <linux/random.h>
27#include <linux/buffer_head.h>
28#include <linux/exportfs.h>
29#include <linux/vfs.h>
30#include <linux/seq_file.h>
31#include <linux/mount.h>
32#include <linux/log2.h>
33#include <linux/quotaops.h>
34#include <asm/uaccess.h>
35#include "ext2.h"
36#include "xattr.h"
37#include "acl.h"
38#include "xip.h"
39
40static void ext2_sync_super(struct super_block *sb,
41 struct ext2_super_block *es, int wait);
42static int ext2_remount (struct super_block * sb, int * flags, char * data);
43static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
44static int ext2_sync_fs(struct super_block *sb, int wait);
45static int ext2_freeze(struct super_block *sb);
46static int ext2_unfreeze(struct super_block *sb);
47
48void ext2_error(struct super_block *sb, const char *function,
49 const char *fmt, ...)
50{
51 struct va_format vaf;
52 va_list args;
53 struct ext2_sb_info *sbi = EXT2_SB(sb);
54 struct ext2_super_block *es = sbi->s_es;
55
56 if (!(sb->s_flags & MS_RDONLY)) {
57 spin_lock(&sbi->s_lock);
58 sbi->s_mount_state |= EXT2_ERROR_FS;
59 es->s_state |= cpu_to_le16(EXT2_ERROR_FS);
60 spin_unlock(&sbi->s_lock);
61 ext2_sync_super(sb, es, 1);
62 }
63
64 va_start(args, fmt);
65
66 vaf.fmt = fmt;
67 vaf.va = &args;
68
69 printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n",
70 sb->s_id, function, &vaf);
71
72 va_end(args);
73
74 if (test_opt(sb, ERRORS_PANIC))
75 panic("EXT2-fs: panic from previous error\n");
76 if (test_opt(sb, ERRORS_RO)) {
77 ext2_msg(sb, KERN_CRIT,
78 "error: remounting filesystem read-only");
79 sb->s_flags |= MS_RDONLY;
80 }
81}
82
83void ext2_msg(struct super_block *sb, const char *prefix,
84 const char *fmt, ...)
85{
86 struct va_format vaf;
87 va_list args;
88
89 va_start(args, fmt);
90
91 vaf.fmt = fmt;
92 vaf.va = &args;
93
94 printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
95
96 va_end(args);
97}
98
99/*
100 * This must be called with sbi->s_lock held.
101 */
102void ext2_update_dynamic_rev(struct super_block *sb)
103{
104 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
105
106 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV)
107 return;
108
109 ext2_msg(sb, KERN_WARNING,
110 "warning: updating to rev %d because of "
111 "new feature flag, running e2fsck is recommended",
112 EXT2_DYNAMIC_REV);
113
114 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO);
115 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE);
116 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV);
117 /* leave es->s_feature_*compat flags alone */
118 /* es->s_uuid will be set by e2fsck if empty */
119
120 /*
121 * The rest of the superblock fields should be zero, and if not it
122 * means they are likely already in use, so leave them alone. We
123 * can leave it up to e2fsck to clean up any inconsistencies there.
124 */
125}
126
127static void ext2_put_super (struct super_block * sb)
128{
129 int db_count;
130 int i;
131 struct ext2_sb_info *sbi = EXT2_SB(sb);
132
133 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
134
135 ext2_xattr_put_super(sb);
136 if (!(sb->s_flags & MS_RDONLY)) {
137 struct ext2_super_block *es = sbi->s_es;
138
139 spin_lock(&sbi->s_lock);
140 es->s_state = cpu_to_le16(sbi->s_mount_state);
141 spin_unlock(&sbi->s_lock);
142 ext2_sync_super(sb, es, 1);
143 }
144 db_count = sbi->s_gdb_count;
145 for (i = 0; i < db_count; i++)
146 if (sbi->s_group_desc[i])
147 brelse (sbi->s_group_desc[i]);
148 kfree(sbi->s_group_desc);
149 kfree(sbi->s_debts);
150 percpu_counter_destroy(&sbi->s_freeblocks_counter);
151 percpu_counter_destroy(&sbi->s_freeinodes_counter);
152 percpu_counter_destroy(&sbi->s_dirs_counter);
153 brelse (sbi->s_sbh);
154 sb->s_fs_info = NULL;
155 kfree(sbi->s_blockgroup_lock);
156 kfree(sbi);
157}
158
159static struct kmem_cache * ext2_inode_cachep;
160
161static struct inode *ext2_alloc_inode(struct super_block *sb)
162{
163 struct ext2_inode_info *ei;
164 ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL);
165 if (!ei)
166 return NULL;
167 ei->i_block_alloc_info = NULL;
168 ei->vfs_inode.i_version = 1;
169 return &ei->vfs_inode;
170}
171
172static void ext2_i_callback(struct rcu_head *head)
173{
174 struct inode *inode = container_of(head, struct inode, i_rcu);
175 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
176}
177
178static void ext2_destroy_inode(struct inode *inode)
179{
180 call_rcu(&inode->i_rcu, ext2_i_callback);
181}
182
183static void init_once(void *foo)
184{
185 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
186
187 rwlock_init(&ei->i_meta_lock);
188#ifdef CONFIG_EXT2_FS_XATTR
189 init_rwsem(&ei->xattr_sem);
190#endif
191 mutex_init(&ei->truncate_mutex);
192 inode_init_once(&ei->vfs_inode);
193}
194
195static int __init init_inodecache(void)
196{
197 ext2_inode_cachep = kmem_cache_create("ext2_inode_cache",
198 sizeof(struct ext2_inode_info),
199 0, (SLAB_RECLAIM_ACCOUNT|
200 SLAB_MEM_SPREAD),
201 init_once);
202 if (ext2_inode_cachep == NULL)
203 return -ENOMEM;
204 return 0;
205}
206
207static void destroy_inodecache(void)
208{
209 /*
210 * Make sure all delayed rcu free inodes are flushed before we
211 * destroy cache.
212 */
213 rcu_barrier();
214 kmem_cache_destroy(ext2_inode_cachep);
215}
216
217static int ext2_show_options(struct seq_file *seq, struct dentry *root)
218{
219 struct super_block *sb = root->d_sb;
220 struct ext2_sb_info *sbi = EXT2_SB(sb);
221 struct ext2_super_block *es = sbi->s_es;
222 unsigned long def_mount_opts;
223
224 spin_lock(&sbi->s_lock);
225 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
226
227 if (sbi->s_sb_block != 1)
228 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
229 if (test_opt(sb, MINIX_DF))
230 seq_puts(seq, ",minixdf");
231 if (test_opt(sb, GRPID))
232 seq_puts(seq, ",grpid");
233 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS))
234 seq_puts(seq, ",nogrpid");
235 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) ||
236 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) {
237 seq_printf(seq, ",resuid=%u",
238 from_kuid_munged(&init_user_ns, sbi->s_resuid));
239 }
240 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) ||
241 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) {
242 seq_printf(seq, ",resgid=%u",
243 from_kgid_munged(&init_user_ns, sbi->s_resgid));
244 }
245 if (test_opt(sb, ERRORS_RO)) {
246 int def_errors = le16_to_cpu(es->s_errors);
247
248 if (def_errors == EXT2_ERRORS_PANIC ||
249 def_errors == EXT2_ERRORS_CONTINUE) {
250 seq_puts(seq, ",errors=remount-ro");
251 }
252 }
253 if (test_opt(sb, ERRORS_CONT))
254 seq_puts(seq, ",errors=continue");
255 if (test_opt(sb, ERRORS_PANIC))
256 seq_puts(seq, ",errors=panic");
257 if (test_opt(sb, NO_UID32))
258 seq_puts(seq, ",nouid32");
259 if (test_opt(sb, DEBUG))
260 seq_puts(seq, ",debug");
261 if (test_opt(sb, OLDALLOC))
262 seq_puts(seq, ",oldalloc");
263
264#ifdef CONFIG_EXT2_FS_XATTR
265 if (test_opt(sb, XATTR_USER))
266 seq_puts(seq, ",user_xattr");
267 if (!test_opt(sb, XATTR_USER) &&
268 (def_mount_opts & EXT2_DEFM_XATTR_USER)) {
269 seq_puts(seq, ",nouser_xattr");
270 }
271#endif
272
273#ifdef CONFIG_EXT2_FS_POSIX_ACL
274 if (test_opt(sb, POSIX_ACL))
275 seq_puts(seq, ",acl");
276 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL))
277 seq_puts(seq, ",noacl");
278#endif
279
280 if (test_opt(sb, NOBH))
281 seq_puts(seq, ",nobh");
282
283#if defined(CONFIG_QUOTA)
284 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA)
285 seq_puts(seq, ",usrquota");
286
287 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA)
288 seq_puts(seq, ",grpquota");
289#endif
290
291#if defined(CONFIG_EXT2_FS_XIP)
292 if (sbi->s_mount_opt & EXT2_MOUNT_XIP)
293 seq_puts(seq, ",xip");
294#endif
295
296 if (!test_opt(sb, RESERVATION))
297 seq_puts(seq, ",noreservation");
298
299 spin_unlock(&sbi->s_lock);
300 return 0;
301}
302
303#ifdef CONFIG_QUOTA
304static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
305static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
306#endif
307
308static const struct super_operations ext2_sops = {
309 .alloc_inode = ext2_alloc_inode,
310 .destroy_inode = ext2_destroy_inode,
311 .write_inode = ext2_write_inode,
312 .evict_inode = ext2_evict_inode,
313 .put_super = ext2_put_super,
314 .sync_fs = ext2_sync_fs,
315 .freeze_fs = ext2_freeze,
316 .unfreeze_fs = ext2_unfreeze,
317 .statfs = ext2_statfs,
318 .remount_fs = ext2_remount,
319 .show_options = ext2_show_options,
320#ifdef CONFIG_QUOTA
321 .quota_read = ext2_quota_read,
322 .quota_write = ext2_quota_write,
323#endif
324};
325
326static struct inode *ext2_nfs_get_inode(struct super_block *sb,
327 u64 ino, u32 generation)
328{
329 struct inode *inode;
330
331 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
332 return ERR_PTR(-ESTALE);
333 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
334 return ERR_PTR(-ESTALE);
335
336 /*
337 * ext2_iget isn't quite right if the inode is currently unallocated!
338 * However ext2_iget currently does appropriate checks to handle stale
339 * inodes so everything is OK.
340 */
341 inode = ext2_iget(sb, ino);
342 if (IS_ERR(inode))
343 return ERR_CAST(inode);
344 if (generation && inode->i_generation != generation) {
345 /* we didn't find the right inode.. */
346 iput(inode);
347 return ERR_PTR(-ESTALE);
348 }
349 return inode;
350}
351
352static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid,
353 int fh_len, int fh_type)
354{
355 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
356 ext2_nfs_get_inode);
357}
358
359static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid,
360 int fh_len, int fh_type)
361{
362 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
363 ext2_nfs_get_inode);
364}
365
366static const struct export_operations ext2_export_ops = {
367 .fh_to_dentry = ext2_fh_to_dentry,
368 .fh_to_parent = ext2_fh_to_parent,
369 .get_parent = ext2_get_parent,
370};
371
372static unsigned long get_sb_block(void **data)
373{
374 unsigned long sb_block;
375 char *options = (char *) *data;
376
377 if (!options || strncmp(options, "sb=", 3) != 0)
378 return 1; /* Default location */
379 options += 3;
380 sb_block = simple_strtoul(options, &options, 0);
381 if (*options && *options != ',') {
382 printk("EXT2-fs: Invalid sb specification: %s\n",
383 (char *) *data);
384 return 1;
385 }
386 if (*options == ',')
387 options++;
388 *data = (void *) options;
389 return sb_block;
390}
391
392enum {
393 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
394 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
395 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
396 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
397 Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota,
398 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
399};
400
401static const match_table_t tokens = {
402 {Opt_bsd_df, "bsddf"},
403 {Opt_minix_df, "minixdf"},
404 {Opt_grpid, "grpid"},
405 {Opt_grpid, "bsdgroups"},
406 {Opt_nogrpid, "nogrpid"},
407 {Opt_nogrpid, "sysvgroups"},
408 {Opt_resgid, "resgid=%u"},
409 {Opt_resuid, "resuid=%u"},
410 {Opt_sb, "sb=%u"},
411 {Opt_err_cont, "errors=continue"},
412 {Opt_err_panic, "errors=panic"},
413 {Opt_err_ro, "errors=remount-ro"},
414 {Opt_nouid32, "nouid32"},
415 {Opt_nocheck, "check=none"},
416 {Opt_nocheck, "nocheck"},
417 {Opt_debug, "debug"},
418 {Opt_oldalloc, "oldalloc"},
419 {Opt_orlov, "orlov"},
420 {Opt_nobh, "nobh"},
421 {Opt_user_xattr, "user_xattr"},
422 {Opt_nouser_xattr, "nouser_xattr"},
423 {Opt_acl, "acl"},
424 {Opt_noacl, "noacl"},
425 {Opt_xip, "xip"},
426 {Opt_grpquota, "grpquota"},
427 {Opt_ignore, "noquota"},
428 {Opt_quota, "quota"},
429 {Opt_usrquota, "usrquota"},
430 {Opt_reservation, "reservation"},
431 {Opt_noreservation, "noreservation"},
432 {Opt_err, NULL}
433};
434
435static int parse_options(char *options, struct super_block *sb)
436{
437 char *p;
438 struct ext2_sb_info *sbi = EXT2_SB(sb);
439 substring_t args[MAX_OPT_ARGS];
440 int option;
441 kuid_t uid;
442 kgid_t gid;
443
444 if (!options)
445 return 1;
446
447 while ((p = strsep (&options, ",")) != NULL) {
448 int token;
449 if (!*p)
450 continue;
451
452 token = match_token(p, tokens, args);
453 switch (token) {
454 case Opt_bsd_df:
455 clear_opt (sbi->s_mount_opt, MINIX_DF);
456 break;
457 case Opt_minix_df:
458 set_opt (sbi->s_mount_opt, MINIX_DF);
459 break;
460 case Opt_grpid:
461 set_opt (sbi->s_mount_opt, GRPID);
462 break;
463 case Opt_nogrpid:
464 clear_opt (sbi->s_mount_opt, GRPID);
465 break;
466 case Opt_resuid:
467 if (match_int(&args[0], &option))
468 return 0;
469 uid = make_kuid(current_user_ns(), option);
470 if (!uid_valid(uid)) {
471 ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option);
472 return 0;
473
474 }
475 sbi->s_resuid = uid;
476 break;
477 case Opt_resgid:
478 if (match_int(&args[0], &option))
479 return 0;
480 gid = make_kgid(current_user_ns(), option);
481 if (!gid_valid(gid)) {
482 ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option);
483 return 0;
484 }
485 sbi->s_resgid = gid;
486 break;
487 case Opt_sb:
488 /* handled by get_sb_block() instead of here */
489 /* *sb_block = match_int(&args[0]); */
490 break;
491 case Opt_err_panic:
492 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
493 clear_opt (sbi->s_mount_opt, ERRORS_RO);
494 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
495 break;
496 case Opt_err_ro:
497 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
498 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
499 set_opt (sbi->s_mount_opt, ERRORS_RO);
500 break;
501 case Opt_err_cont:
502 clear_opt (sbi->s_mount_opt, ERRORS_RO);
503 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
504 set_opt (sbi->s_mount_opt, ERRORS_CONT);
505 break;
506 case Opt_nouid32:
507 set_opt (sbi->s_mount_opt, NO_UID32);
508 break;
509 case Opt_nocheck:
510 clear_opt (sbi->s_mount_opt, CHECK);
511 break;
512 case Opt_debug:
513 set_opt (sbi->s_mount_opt, DEBUG);
514 break;
515 case Opt_oldalloc:
516 set_opt (sbi->s_mount_opt, OLDALLOC);
517 break;
518 case Opt_orlov:
519 clear_opt (sbi->s_mount_opt, OLDALLOC);
520 break;
521 case Opt_nobh:
522 set_opt (sbi->s_mount_opt, NOBH);
523 break;
524#ifdef CONFIG_EXT2_FS_XATTR
525 case Opt_user_xattr:
526 set_opt (sbi->s_mount_opt, XATTR_USER);
527 break;
528 case Opt_nouser_xattr:
529 clear_opt (sbi->s_mount_opt, XATTR_USER);
530 break;
531#else
532 case Opt_user_xattr:
533 case Opt_nouser_xattr:
534 ext2_msg(sb, KERN_INFO, "(no)user_xattr options"
535 "not supported");
536 break;
537#endif
538#ifdef CONFIG_EXT2_FS_POSIX_ACL
539 case Opt_acl:
540 set_opt(sbi->s_mount_opt, POSIX_ACL);
541 break;
542 case Opt_noacl:
543 clear_opt(sbi->s_mount_opt, POSIX_ACL);
544 break;
545#else
546 case Opt_acl:
547 case Opt_noacl:
548 ext2_msg(sb, KERN_INFO,
549 "(no)acl options not supported");
550 break;
551#endif
552 case Opt_xip:
553#ifdef CONFIG_EXT2_FS_XIP
554 set_opt (sbi->s_mount_opt, XIP);
555#else
556 ext2_msg(sb, KERN_INFO, "xip option not supported");
557#endif
558 break;
559
560#if defined(CONFIG_QUOTA)
561 case Opt_quota:
562 case Opt_usrquota:
563 set_opt(sbi->s_mount_opt, USRQUOTA);
564 break;
565
566 case Opt_grpquota:
567 set_opt(sbi->s_mount_opt, GRPQUOTA);
568 break;
569#else
570 case Opt_quota:
571 case Opt_usrquota:
572 case Opt_grpquota:
573 ext2_msg(sb, KERN_INFO,
574 "quota operations not supported");
575 break;
576#endif
577
578 case Opt_reservation:
579 set_opt(sbi->s_mount_opt, RESERVATION);
580 ext2_msg(sb, KERN_INFO, "reservations ON");
581 break;
582 case Opt_noreservation:
583 clear_opt(sbi->s_mount_opt, RESERVATION);
584 ext2_msg(sb, KERN_INFO, "reservations OFF");
585 break;
586 case Opt_ignore:
587 break;
588 default:
589 return 0;
590 }
591 }
592 return 1;
593}
594
595static int ext2_setup_super (struct super_block * sb,
596 struct ext2_super_block * es,
597 int read_only)
598{
599 int res = 0;
600 struct ext2_sb_info *sbi = EXT2_SB(sb);
601
602 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
603 ext2_msg(sb, KERN_ERR,
604 "error: revision level too high, "
605 "forcing read-only mode");
606 res = MS_RDONLY;
607 }
608 if (read_only)
609 return res;
610 if (!(sbi->s_mount_state & EXT2_VALID_FS))
611 ext2_msg(sb, KERN_WARNING,
612 "warning: mounting unchecked fs, "
613 "running e2fsck is recommended");
614 else if ((sbi->s_mount_state & EXT2_ERROR_FS))
615 ext2_msg(sb, KERN_WARNING,
616 "warning: mounting fs with errors, "
617 "running e2fsck is recommended");
618 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
619 le16_to_cpu(es->s_mnt_count) >=
620 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
621 ext2_msg(sb, KERN_WARNING,
622 "warning: maximal mount count reached, "
623 "running e2fsck is recommended");
624 else if (le32_to_cpu(es->s_checkinterval) &&
625 (le32_to_cpu(es->s_lastcheck) +
626 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
627 ext2_msg(sb, KERN_WARNING,
628 "warning: checktime reached, "
629 "running e2fsck is recommended");
630 if (!le16_to_cpu(es->s_max_mnt_count))
631 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
632 le16_add_cpu(&es->s_mnt_count, 1);
633 if (test_opt (sb, DEBUG))
634 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, "
635 "bpg=%lu, ipg=%lu, mo=%04lx]",
636 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
637 sbi->s_frag_size,
638 sbi->s_groups_count,
639 EXT2_BLOCKS_PER_GROUP(sb),
640 EXT2_INODES_PER_GROUP(sb),
641 sbi->s_mount_opt);
642 return res;
643}
644
645static int ext2_check_descriptors(struct super_block *sb)
646{
647 int i;
648 struct ext2_sb_info *sbi = EXT2_SB(sb);
649
650 ext2_debug ("Checking group descriptors");
651
652 for (i = 0; i < sbi->s_groups_count; i++) {
653 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL);
654 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i);
655 ext2_fsblk_t last_block;
656
657 if (i == sbi->s_groups_count - 1)
658 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
659 else
660 last_block = first_block +
661 (EXT2_BLOCKS_PER_GROUP(sb) - 1);
662
663 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
664 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
665 {
666 ext2_error (sb, "ext2_check_descriptors",
667 "Block bitmap for group %d"
668 " not in group (block %lu)!",
669 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap));
670 return 0;
671 }
672 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
673 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
674 {
675 ext2_error (sb, "ext2_check_descriptors",
676 "Inode bitmap for group %d"
677 " not in group (block %lu)!",
678 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap));
679 return 0;
680 }
681 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
682 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
683 last_block)
684 {
685 ext2_error (sb, "ext2_check_descriptors",
686 "Inode table for group %d"
687 " not in group (block %lu)!",
688 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table));
689 return 0;
690 }
691 }
692 return 1;
693}
694
695/*
696 * Maximal file size. There is a direct, and {,double-,triple-}indirect
697 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
698 * We need to be 1 filesystem block less than the 2^32 sector limit.
699 */
700static loff_t ext2_max_size(int bits)
701{
702 loff_t res = EXT2_NDIR_BLOCKS;
703 int meta_blocks;
704 loff_t upper_limit;
705
706 /* This is calculated to be the largest file size for a
707 * dense, file such that the total number of
708 * sectors in the file, including data and all indirect blocks,
709 * does not exceed 2^32 -1
710 * __u32 i_blocks representing the total number of
711 * 512 bytes blocks of the file
712 */
713 upper_limit = (1LL << 32) - 1;
714
715 /* total blocks in file system block size */
716 upper_limit >>= (bits - 9);
717
718
719 /* indirect blocks */
720 meta_blocks = 1;
721 /* double indirect blocks */
722 meta_blocks += 1 + (1LL << (bits-2));
723 /* tripple indirect blocks */
724 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
725
726 upper_limit -= meta_blocks;
727 upper_limit <<= bits;
728
729 res += 1LL << (bits-2);
730 res += 1LL << (2*(bits-2));
731 res += 1LL << (3*(bits-2));
732 res <<= bits;
733 if (res > upper_limit)
734 res = upper_limit;
735
736 if (res > MAX_LFS_FILESIZE)
737 res = MAX_LFS_FILESIZE;
738
739 return res;
740}
741
742static unsigned long descriptor_loc(struct super_block *sb,
743 unsigned long logic_sb_block,
744 int nr)
745{
746 struct ext2_sb_info *sbi = EXT2_SB(sb);
747 unsigned long bg, first_meta_bg;
748 int has_super = 0;
749
750 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
751
752 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
753 nr < first_meta_bg)
754 return (logic_sb_block + nr + 1);
755 bg = sbi->s_desc_per_block * nr;
756 if (ext2_bg_has_super(sb, bg))
757 has_super = 1;
758
759 return ext2_group_first_block_no(sb, bg) + has_super;
760}
761
762static int ext2_fill_super(struct super_block *sb, void *data, int silent)
763{
764 struct buffer_head * bh;
765 struct ext2_sb_info * sbi;
766 struct ext2_super_block * es;
767 struct inode *root;
768 unsigned long block;
769 unsigned long sb_block = get_sb_block(&data);
770 unsigned long logic_sb_block;
771 unsigned long offset = 0;
772 unsigned long def_mount_opts;
773 long ret = -EINVAL;
774 int blocksize = BLOCK_SIZE;
775 int db_count;
776 int i, j;
777 __le32 features;
778 int err;
779
780 err = -ENOMEM;
781 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
782 if (!sbi)
783 goto failed;
784
785 sbi->s_blockgroup_lock =
786 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
787 if (!sbi->s_blockgroup_lock) {
788 kfree(sbi);
789 goto failed;
790 }
791 sb->s_fs_info = sbi;
792 sbi->s_sb_block = sb_block;
793
794 spin_lock_init(&sbi->s_lock);
795
796 /*
797 * See what the current blocksize for the device is, and
798 * use that as the blocksize. Otherwise (or if the blocksize
799 * is smaller than the default) use the default.
800 * This is important for devices that have a hardware
801 * sectorsize that is larger than the default.
802 */
803 blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
804 if (!blocksize) {
805 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize");
806 goto failed_sbi;
807 }
808
809 /*
810 * If the superblock doesn't start on a hardware sector boundary,
811 * calculate the offset.
812 */
813 if (blocksize != BLOCK_SIZE) {
814 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
815 offset = (sb_block*BLOCK_SIZE) % blocksize;
816 } else {
817 logic_sb_block = sb_block;
818 }
819
820 if (!(bh = sb_bread(sb, logic_sb_block))) {
821 ext2_msg(sb, KERN_ERR, "error: unable to read superblock");
822 goto failed_sbi;
823 }
824 /*
825 * Note: s_es must be initialized as soon as possible because
826 * some ext2 macro-instructions depend on its value
827 */
828 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
829 sbi->s_es = es;
830 sb->s_magic = le16_to_cpu(es->s_magic);
831
832 if (sb->s_magic != EXT2_SUPER_MAGIC)
833 goto cantfind_ext2;
834
835 /* Set defaults before we parse the mount options */
836 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
837 if (def_mount_opts & EXT2_DEFM_DEBUG)
838 set_opt(sbi->s_mount_opt, DEBUG);
839 if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
840 set_opt(sbi->s_mount_opt, GRPID);
841 if (def_mount_opts & EXT2_DEFM_UID16)
842 set_opt(sbi->s_mount_opt, NO_UID32);
843#ifdef CONFIG_EXT2_FS_XATTR
844 if (def_mount_opts & EXT2_DEFM_XATTR_USER)
845 set_opt(sbi->s_mount_opt, XATTR_USER);
846#endif
847#ifdef CONFIG_EXT2_FS_POSIX_ACL
848 if (def_mount_opts & EXT2_DEFM_ACL)
849 set_opt(sbi->s_mount_opt, POSIX_ACL);
850#endif
851
852 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
853 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
854 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
855 set_opt(sbi->s_mount_opt, ERRORS_CONT);
856 else
857 set_opt(sbi->s_mount_opt, ERRORS_RO);
858
859 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
860 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
861
862 set_opt(sbi->s_mount_opt, RESERVATION);
863
864 if (!parse_options((char *) data, sb))
865 goto failed_mount;
866
867 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
868 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
869 MS_POSIXACL : 0);
870
871 ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
872 EXT2_MOUNT_XIP if not */
873
874 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
875 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
876 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
877 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
878 ext2_msg(sb, KERN_WARNING,
879 "warning: feature flags set on rev 0 fs, "
880 "running e2fsck is recommended");
881 /*
882 * Check feature flags regardless of the revision level, since we
883 * previously didn't change the revision level when setting the flags,
884 * so there is a chance incompat flags are set on a rev 0 filesystem.
885 */
886 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
887 if (features) {
888 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of "
889 "unsupported optional features (%x)",
890 le32_to_cpu(features));
891 goto failed_mount;
892 }
893 if (!(sb->s_flags & MS_RDONLY) &&
894 (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
895 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of "
896 "unsupported optional features (%x)",
897 le32_to_cpu(features));
898 goto failed_mount;
899 }
900
901 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
902
903 if (ext2_use_xip(sb) && blocksize != PAGE_SIZE) {
904 if (!silent)
905 ext2_msg(sb, KERN_ERR,
906 "error: unsupported blocksize for xip");
907 goto failed_mount;
908 }
909
910 /* If the blocksize doesn't match, re-read the thing.. */
911 if (sb->s_blocksize != blocksize) {
912 brelse(bh);
913
914 if (!sb_set_blocksize(sb, blocksize)) {
915 ext2_msg(sb, KERN_ERR,
916 "error: bad blocksize %d", blocksize);
917 goto failed_sbi;
918 }
919
920 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
921 offset = (sb_block*BLOCK_SIZE) % blocksize;
922 bh = sb_bread(sb, logic_sb_block);
923 if(!bh) {
924 ext2_msg(sb, KERN_ERR, "error: couldn't read"
925 "superblock on 2nd try");
926 goto failed_sbi;
927 }
928 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
929 sbi->s_es = es;
930 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
931 ext2_msg(sb, KERN_ERR, "error: magic mismatch");
932 goto failed_mount;
933 }
934 }
935
936 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
937 sb->s_max_links = EXT2_LINK_MAX;
938
939 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
940 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
941 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
942 } else {
943 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
944 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
945 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
946 !is_power_of_2(sbi->s_inode_size) ||
947 (sbi->s_inode_size > blocksize)) {
948 ext2_msg(sb, KERN_ERR,
949 "error: unsupported inode size: %d",
950 sbi->s_inode_size);
951 goto failed_mount;
952 }
953 }
954
955 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
956 le32_to_cpu(es->s_log_frag_size);
957 if (sbi->s_frag_size == 0)
958 goto cantfind_ext2;
959 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
960
961 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
962 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
963 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
964
965 if (EXT2_INODE_SIZE(sb) == 0)
966 goto cantfind_ext2;
967 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
968 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
969 goto cantfind_ext2;
970 sbi->s_itb_per_group = sbi->s_inodes_per_group /
971 sbi->s_inodes_per_block;
972 sbi->s_desc_per_block = sb->s_blocksize /
973 sizeof (struct ext2_group_desc);
974 sbi->s_sbh = bh;
975 sbi->s_mount_state = le16_to_cpu(es->s_state);
976 sbi->s_addr_per_block_bits =
977 ilog2 (EXT2_ADDR_PER_BLOCK(sb));
978 sbi->s_desc_per_block_bits =
979 ilog2 (EXT2_DESC_PER_BLOCK(sb));
980
981 if (sb->s_magic != EXT2_SUPER_MAGIC)
982 goto cantfind_ext2;
983
984 if (sb->s_blocksize != bh->b_size) {
985 if (!silent)
986 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize");
987 goto failed_mount;
988 }
989
990 if (sb->s_blocksize != sbi->s_frag_size) {
991 ext2_msg(sb, KERN_ERR,
992 "error: fragsize %lu != blocksize %lu"
993 "(not supported yet)",
994 sbi->s_frag_size, sb->s_blocksize);
995 goto failed_mount;
996 }
997
998 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
999 ext2_msg(sb, KERN_ERR,
1000 "error: #blocks per group too big: %lu",
1001 sbi->s_blocks_per_group);
1002 goto failed_mount;
1003 }
1004 if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
1005 ext2_msg(sb, KERN_ERR,
1006 "error: #fragments per group too big: %lu",
1007 sbi->s_frags_per_group);
1008 goto failed_mount;
1009 }
1010 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
1011 ext2_msg(sb, KERN_ERR,
1012 "error: #inodes per group too big: %lu",
1013 sbi->s_inodes_per_group);
1014 goto failed_mount;
1015 }
1016
1017 if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
1018 goto cantfind_ext2;
1019 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1020 le32_to_cpu(es->s_first_data_block) - 1)
1021 / EXT2_BLOCKS_PER_GROUP(sb)) + 1;
1022 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
1023 EXT2_DESC_PER_BLOCK(sb);
1024 sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
1025 if (sbi->s_group_desc == NULL) {
1026 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1027 goto failed_mount;
1028 }
1029 bgl_lock_init(sbi->s_blockgroup_lock);
1030 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
1031 if (!sbi->s_debts) {
1032 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1033 goto failed_mount_group_desc;
1034 }
1035 for (i = 0; i < db_count; i++) {
1036 block = descriptor_loc(sb, logic_sb_block, i);
1037 sbi->s_group_desc[i] = sb_bread(sb, block);
1038 if (!sbi->s_group_desc[i]) {
1039 for (j = 0; j < i; j++)
1040 brelse (sbi->s_group_desc[j]);
1041 ext2_msg(sb, KERN_ERR,
1042 "error: unable to read group descriptors");
1043 goto failed_mount_group_desc;
1044 }
1045 }
1046 if (!ext2_check_descriptors (sb)) {
1047 ext2_msg(sb, KERN_ERR, "group descriptors corrupted");
1048 goto failed_mount2;
1049 }
1050 sbi->s_gdb_count = db_count;
1051 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1052 spin_lock_init(&sbi->s_next_gen_lock);
1053
1054 /* per fileystem reservation list head & lock */
1055 spin_lock_init(&sbi->s_rsv_window_lock);
1056 sbi->s_rsv_window_root = RB_ROOT;
1057 /*
1058 * Add a single, static dummy reservation to the start of the
1059 * reservation window list --- it gives us a placeholder for
1060 * append-at-start-of-list which makes the allocation logic
1061 * _much_ simpler.
1062 */
1063 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1064 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1065 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1066 sbi->s_rsv_window_head.rsv_goal_size = 0;
1067 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head);
1068
1069 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1070 ext2_count_free_blocks(sb));
1071 if (!err) {
1072 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1073 ext2_count_free_inodes(sb));
1074 }
1075 if (!err) {
1076 err = percpu_counter_init(&sbi->s_dirs_counter,
1077 ext2_count_dirs(sb));
1078 }
1079 if (err) {
1080 ext2_msg(sb, KERN_ERR, "error: insufficient memory");
1081 goto failed_mount3;
1082 }
1083 /*
1084 * set up enough so that it can read an inode
1085 */
1086 sb->s_op = &ext2_sops;
1087 sb->s_export_op = &ext2_export_ops;
1088 sb->s_xattr = ext2_xattr_handlers;
1089
1090#ifdef CONFIG_QUOTA
1091 sb->dq_op = &dquot_operations;
1092 sb->s_qcop = &dquot_quotactl_ops;
1093#endif
1094
1095 root = ext2_iget(sb, EXT2_ROOT_INO);
1096 if (IS_ERR(root)) {
1097 ret = PTR_ERR(root);
1098 goto failed_mount3;
1099 }
1100 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1101 iput(root);
1102 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
1103 goto failed_mount3;
1104 }
1105
1106 sb->s_root = d_make_root(root);
1107 if (!sb->s_root) {
1108 ext2_msg(sb, KERN_ERR, "error: get root inode failed");
1109 ret = -ENOMEM;
1110 goto failed_mount3;
1111 }
1112 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
1113 ext2_msg(sb, KERN_WARNING,
1114 "warning: mounting ext3 filesystem as ext2");
1115 if (ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY))
1116 sb->s_flags |= MS_RDONLY;
1117 ext2_write_super(sb);
1118 return 0;
1119
1120cantfind_ext2:
1121 if (!silent)
1122 ext2_msg(sb, KERN_ERR,
1123 "error: can't find an ext2 filesystem on dev %s.",
1124 sb->s_id);
1125 goto failed_mount;
1126failed_mount3:
1127 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1128 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1129 percpu_counter_destroy(&sbi->s_dirs_counter);
1130failed_mount2:
1131 for (i = 0; i < db_count; i++)
1132 brelse(sbi->s_group_desc[i]);
1133failed_mount_group_desc:
1134 kfree(sbi->s_group_desc);
1135 kfree(sbi->s_debts);
1136failed_mount:
1137 brelse(bh);
1138failed_sbi:
1139 sb->s_fs_info = NULL;
1140 kfree(sbi->s_blockgroup_lock);
1141 kfree(sbi);
1142failed:
1143 return ret;
1144}
1145
1146static void ext2_clear_super_error(struct super_block *sb)
1147{
1148 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh;
1149
1150 if (buffer_write_io_error(sbh)) {
1151 /*
1152 * Oh, dear. A previous attempt to write the
1153 * superblock failed. This could happen because the
1154 * USB device was yanked out. Or it could happen to
1155 * be a transient write error and maybe the block will
1156 * be remapped. Nothing we can do but to retry the
1157 * write and hope for the best.
1158 */
1159 ext2_msg(sb, KERN_ERR,
1160 "previous I/O error to superblock detected\n");
1161 clear_buffer_write_io_error(sbh);
1162 set_buffer_uptodate(sbh);
1163 }
1164}
1165
1166static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
1167 int wait)
1168{
1169 ext2_clear_super_error(sb);
1170 spin_lock(&EXT2_SB(sb)->s_lock);
1171 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1172 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1173 es->s_wtime = cpu_to_le32(get_seconds());
1174 /* unlock before we do IO */
1175 spin_unlock(&EXT2_SB(sb)->s_lock);
1176 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
1177 if (wait)
1178 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
1179}
1180
1181/*
1182 * In the second extended file system, it is not necessary to
1183 * write the super block since we use a mapping of the
1184 * disk super block in a buffer.
1185 *
1186 * However, this function is still used to set the fs valid
1187 * flags to 0. We need to set this flag to 0 since the fs
1188 * may have been checked while mounted and e2fsck may have
1189 * set s_state to EXT2_VALID_FS after some corrections.
1190 */
1191static int ext2_sync_fs(struct super_block *sb, int wait)
1192{
1193 struct ext2_sb_info *sbi = EXT2_SB(sb);
1194 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
1195
1196 /*
1197 * Write quota structures to quota file, sync_blockdev() will write
1198 * them to disk later
1199 */
1200 dquot_writeback_dquots(sb, -1);
1201
1202 spin_lock(&sbi->s_lock);
1203 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) {
1204 ext2_debug("setting valid to 0\n");
1205 es->s_state &= cpu_to_le16(~EXT2_VALID_FS);
1206 }
1207 spin_unlock(&sbi->s_lock);
1208 ext2_sync_super(sb, es, wait);
1209 return 0;
1210}
1211
1212static int ext2_freeze(struct super_block *sb)
1213{
1214 struct ext2_sb_info *sbi = EXT2_SB(sb);
1215
1216 /*
1217 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared
1218 * because we have unattached inodes and thus filesystem is not fully
1219 * consistent.
1220 */
1221 if (atomic_long_read(&sb->s_remove_count)) {
1222 ext2_sync_fs(sb, 1);
1223 return 0;
1224 }
1225 /* Set EXT2_FS_VALID flag */
1226 spin_lock(&sbi->s_lock);
1227 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state);
1228 spin_unlock(&sbi->s_lock);
1229 ext2_sync_super(sb, sbi->s_es, 1);
1230
1231 return 0;
1232}
1233
1234static int ext2_unfreeze(struct super_block *sb)
1235{
1236 /* Just write sb to clear EXT2_VALID_FS flag */
1237 ext2_write_super(sb);
1238
1239 return 0;
1240}
1241
1242void ext2_write_super(struct super_block *sb)
1243{
1244 if (!(sb->s_flags & MS_RDONLY))
1245 ext2_sync_fs(sb, 1);
1246}
1247
1248static int ext2_remount (struct super_block * sb, int * flags, char * data)
1249{
1250 struct ext2_sb_info * sbi = EXT2_SB(sb);
1251 struct ext2_super_block * es;
1252 unsigned long old_mount_opt = sbi->s_mount_opt;
1253 struct ext2_mount_options old_opts;
1254 unsigned long old_sb_flags;
1255 int err;
1256
1257 sync_filesystem(sb);
1258 spin_lock(&sbi->s_lock);
1259
1260 /* Store the old options */
1261 old_sb_flags = sb->s_flags;
1262 old_opts.s_mount_opt = sbi->s_mount_opt;
1263 old_opts.s_resuid = sbi->s_resuid;
1264 old_opts.s_resgid = sbi->s_resgid;
1265
1266 /*
1267 * Allow the "check" option to be passed as a remount option.
1268 */
1269 if (!parse_options(data, sb)) {
1270 err = -EINVAL;
1271 goto restore_opts;
1272 }
1273
1274 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1275 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1276
1277 ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
1278 EXT2_MOUNT_XIP if not */
1279
1280 if ((ext2_use_xip(sb)) && (sb->s_blocksize != PAGE_SIZE)) {
1281 ext2_msg(sb, KERN_WARNING,
1282 "warning: unsupported blocksize for xip");
1283 err = -EINVAL;
1284 goto restore_opts;
1285 }
1286
1287 es = sbi->s_es;
1288 if ((sbi->s_mount_opt ^ old_mount_opt) & EXT2_MOUNT_XIP) {
1289 ext2_msg(sb, KERN_WARNING, "warning: refusing change of "
1290 "xip flag with busy inodes while remounting");
1291 sbi->s_mount_opt &= ~EXT2_MOUNT_XIP;
1292 sbi->s_mount_opt |= old_mount_opt & EXT2_MOUNT_XIP;
1293 }
1294 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
1295 spin_unlock(&sbi->s_lock);
1296 return 0;
1297 }
1298 if (*flags & MS_RDONLY) {
1299 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
1300 !(sbi->s_mount_state & EXT2_VALID_FS)) {
1301 spin_unlock(&sbi->s_lock);
1302 return 0;
1303 }
1304
1305 /*
1306 * OK, we are remounting a valid rw partition rdonly, so set
1307 * the rdonly flag and then mark the partition as valid again.
1308 */
1309 es->s_state = cpu_to_le16(sbi->s_mount_state);
1310 es->s_mtime = cpu_to_le32(get_seconds());
1311 spin_unlock(&sbi->s_lock);
1312
1313 err = dquot_suspend(sb, -1);
1314 if (err < 0) {
1315 spin_lock(&sbi->s_lock);
1316 goto restore_opts;
1317 }
1318
1319 ext2_sync_super(sb, es, 1);
1320 } else {
1321 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
1322 ~EXT2_FEATURE_RO_COMPAT_SUPP);
1323 if (ret) {
1324 ext2_msg(sb, KERN_WARNING,
1325 "warning: couldn't remount RDWR because of "
1326 "unsupported optional features (%x).",
1327 le32_to_cpu(ret));
1328 err = -EROFS;
1329 goto restore_opts;
1330 }
1331 /*
1332 * Mounting a RDONLY partition read-write, so reread and
1333 * store the current valid flag. (It may have been changed
1334 * by e2fsck since we originally mounted the partition.)
1335 */
1336 sbi->s_mount_state = le16_to_cpu(es->s_state);
1337 if (!ext2_setup_super (sb, es, 0))
1338 sb->s_flags &= ~MS_RDONLY;
1339 spin_unlock(&sbi->s_lock);
1340
1341 ext2_write_super(sb);
1342
1343 dquot_resume(sb, -1);
1344 }
1345
1346 return 0;
1347restore_opts:
1348 sbi->s_mount_opt = old_opts.s_mount_opt;
1349 sbi->s_resuid = old_opts.s_resuid;
1350 sbi->s_resgid = old_opts.s_resgid;
1351 sb->s_flags = old_sb_flags;
1352 spin_unlock(&sbi->s_lock);
1353 return err;
1354}
1355
1356static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
1357{
1358 struct super_block *sb = dentry->d_sb;
1359 struct ext2_sb_info *sbi = EXT2_SB(sb);
1360 struct ext2_super_block *es = sbi->s_es;
1361 u64 fsid;
1362
1363 spin_lock(&sbi->s_lock);
1364
1365 if (test_opt (sb, MINIX_DF))
1366 sbi->s_overhead_last = 0;
1367 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
1368 unsigned long i, overhead = 0;
1369 smp_rmb();
1370
1371 /*
1372 * Compute the overhead (FS structures). This is constant
1373 * for a given filesystem unless the number of block groups
1374 * changes so we cache the previous value until it does.
1375 */
1376
1377 /*
1378 * All of the blocks before first_data_block are
1379 * overhead
1380 */
1381 overhead = le32_to_cpu(es->s_first_data_block);
1382
1383 /*
1384 * Add the overhead attributed to the superblock and
1385 * block group descriptors. If the sparse superblocks
1386 * feature is turned on, then not all groups have this.
1387 */
1388 for (i = 0; i < sbi->s_groups_count; i++)
1389 overhead += ext2_bg_has_super(sb, i) +
1390 ext2_bg_num_gdb(sb, i);
1391
1392 /*
1393 * Every block group has an inode bitmap, a block
1394 * bitmap, and an inode table.
1395 */
1396 overhead += (sbi->s_groups_count *
1397 (2 + sbi->s_itb_per_group));
1398 sbi->s_overhead_last = overhead;
1399 smp_wmb();
1400 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1401 }
1402
1403 buf->f_type = EXT2_SUPER_MAGIC;
1404 buf->f_bsize = sb->s_blocksize;
1405 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
1406 buf->f_bfree = ext2_count_free_blocks(sb);
1407 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
1408 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
1409 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
1410 buf->f_bavail = 0;
1411 buf->f_files = le32_to_cpu(es->s_inodes_count);
1412 buf->f_ffree = ext2_count_free_inodes(sb);
1413 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
1414 buf->f_namelen = EXT2_NAME_LEN;
1415 fsid = le64_to_cpup((void *)es->s_uuid) ^
1416 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
1417 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
1418 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1419 spin_unlock(&sbi->s_lock);
1420 return 0;
1421}
1422
1423static struct dentry *ext2_mount(struct file_system_type *fs_type,
1424 int flags, const char *dev_name, void *data)
1425{
1426 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super);
1427}
1428
1429#ifdef CONFIG_QUOTA
1430
1431/* Read data from quotafile - avoid pagecache and such because we cannot afford
1432 * acquiring the locks... As quota files are never truncated and quota code
1433 * itself serializes the operations (and no one else should touch the files)
1434 * we don't have to be afraid of races */
1435static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
1436 size_t len, loff_t off)
1437{
1438 struct inode *inode = sb_dqopt(sb)->files[type];
1439 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1440 int err = 0;
1441 int offset = off & (sb->s_blocksize - 1);
1442 int tocopy;
1443 size_t toread;
1444 struct buffer_head tmp_bh;
1445 struct buffer_head *bh;
1446 loff_t i_size = i_size_read(inode);
1447
1448 if (off > i_size)
1449 return 0;
1450 if (off+len > i_size)
1451 len = i_size-off;
1452 toread = len;
1453 while (toread > 0) {
1454 tocopy = sb->s_blocksize - offset < toread ?
1455 sb->s_blocksize - offset : toread;
1456
1457 tmp_bh.b_state = 0;
1458 tmp_bh.b_size = sb->s_blocksize;
1459 err = ext2_get_block(inode, blk, &tmp_bh, 0);
1460 if (err < 0)
1461 return err;
1462 if (!buffer_mapped(&tmp_bh)) /* A hole? */
1463 memset(data, 0, tocopy);
1464 else {
1465 bh = sb_bread(sb, tmp_bh.b_blocknr);
1466 if (!bh)
1467 return -EIO;
1468 memcpy(data, bh->b_data+offset, tocopy);
1469 brelse(bh);
1470 }
1471 offset = 0;
1472 toread -= tocopy;
1473 data += tocopy;
1474 blk++;
1475 }
1476 return len;
1477}
1478
1479/* Write to quotafile */
1480static ssize_t ext2_quota_write(struct super_block *sb, int type,
1481 const char *data, size_t len, loff_t off)
1482{
1483 struct inode *inode = sb_dqopt(sb)->files[type];
1484 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1485 int err = 0;
1486 int offset = off & (sb->s_blocksize - 1);
1487 int tocopy;
1488 size_t towrite = len;
1489 struct buffer_head tmp_bh;
1490 struct buffer_head *bh;
1491
1492 while (towrite > 0) {
1493 tocopy = sb->s_blocksize - offset < towrite ?
1494 sb->s_blocksize - offset : towrite;
1495
1496 tmp_bh.b_state = 0;
1497 tmp_bh.b_size = sb->s_blocksize;
1498 err = ext2_get_block(inode, blk, &tmp_bh, 1);
1499 if (err < 0)
1500 goto out;
1501 if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
1502 bh = sb_bread(sb, tmp_bh.b_blocknr);
1503 else
1504 bh = sb_getblk(sb, tmp_bh.b_blocknr);
1505 if (unlikely(!bh)) {
1506 err = -EIO;
1507 goto out;
1508 }
1509 lock_buffer(bh);
1510 memcpy(bh->b_data+offset, data, tocopy);
1511 flush_dcache_page(bh->b_page);
1512 set_buffer_uptodate(bh);
1513 mark_buffer_dirty(bh);
1514 unlock_buffer(bh);
1515 brelse(bh);
1516 offset = 0;
1517 towrite -= tocopy;
1518 data += tocopy;
1519 blk++;
1520 }
1521out:
1522 if (len == towrite)
1523 return err;
1524 if (inode->i_size < off+len-towrite)
1525 i_size_write(inode, off+len-towrite);
1526 inode->i_version++;
1527 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1528 mark_inode_dirty(inode);
1529 return len - towrite;
1530}
1531
1532#endif
1533
1534static struct file_system_type ext2_fs_type = {
1535 .owner = THIS_MODULE,
1536 .name = "ext2",
1537 .mount = ext2_mount,
1538 .kill_sb = kill_block_super,
1539 .fs_flags = FS_REQUIRES_DEV,
1540};
1541MODULE_ALIAS_FS("ext2");
1542
1543static int __init init_ext2_fs(void)
1544{
1545 int err = init_ext2_xattr();
1546 if (err)
1547 return err;
1548 err = init_inodecache();
1549 if (err)
1550 goto out1;
1551 err = register_filesystem(&ext2_fs_type);
1552 if (err)
1553 goto out;
1554 return 0;
1555out:
1556 destroy_inodecache();
1557out1:
1558 exit_ext2_xattr();
1559 return err;
1560}
1561
1562static void __exit exit_ext2_fs(void)
1563{
1564 unregister_filesystem(&ext2_fs_type);
1565 destroy_inodecache();
1566 exit_ext2_xattr();
1567}
1568
1569MODULE_AUTHOR("Remy Card and others");
1570MODULE_DESCRIPTION("Second Extended Filesystem");
1571MODULE_LICENSE("GPL");
1572module_init(init_ext2_fs)
1573module_exit(exit_ext2_fs)