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1/*
2 * linux/fs/ext3/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/blkdev.h>
21#include <linux/parser.h>
22#include <linux/exportfs.h>
23#include <linux/statfs.h>
24#include <linux/random.h>
25#include <linux/mount.h>
26#include <linux/quotaops.h>
27#include <linux/seq_file.h>
28#include <linux/log2.h>
29#include <linux/cleancache.h>
30
31#include <asm/uaccess.h>
32
33#define CREATE_TRACE_POINTS
34
35#include "ext3.h"
36#include "xattr.h"
37#include "acl.h"
38#include "namei.h"
39
40#ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
41 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
42#else
43 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
44#endif
45
46static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
47 unsigned long journal_devnum);
48static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
49 unsigned int);
50static int ext3_commit_super(struct super_block *sb,
51 struct ext3_super_block *es,
52 int sync);
53static void ext3_mark_recovery_complete(struct super_block * sb,
54 struct ext3_super_block * es);
55static void ext3_clear_journal_err(struct super_block * sb,
56 struct ext3_super_block * es);
57static int ext3_sync_fs(struct super_block *sb, int wait);
58static const char *ext3_decode_error(struct super_block * sb, int errno,
59 char nbuf[16]);
60static int ext3_remount (struct super_block * sb, int * flags, char * data);
61static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
62static int ext3_unfreeze(struct super_block *sb);
63static int ext3_freeze(struct super_block *sb);
64
65/*
66 * Wrappers for journal_start/end.
67 *
68 * The only special thing we need to do here is to make sure that all
69 * journal_end calls result in the superblock being marked dirty, so
70 * that sync() will call the filesystem's write_super callback if
71 * appropriate.
72 */
73handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
74{
75 journal_t *journal;
76
77 if (sb->s_flags & MS_RDONLY)
78 return ERR_PTR(-EROFS);
79
80 /* Special case here: if the journal has aborted behind our
81 * backs (eg. EIO in the commit thread), then we still need to
82 * take the FS itself readonly cleanly. */
83 journal = EXT3_SB(sb)->s_journal;
84 if (is_journal_aborted(journal)) {
85 ext3_abort(sb, __func__,
86 "Detected aborted journal");
87 return ERR_PTR(-EROFS);
88 }
89
90 return journal_start(journal, nblocks);
91}
92
93/*
94 * The only special thing we need to do here is to make sure that all
95 * journal_stop calls result in the superblock being marked dirty, so
96 * that sync() will call the filesystem's write_super callback if
97 * appropriate.
98 */
99int __ext3_journal_stop(const char *where, handle_t *handle)
100{
101 struct super_block *sb;
102 int err;
103 int rc;
104
105 sb = handle->h_transaction->t_journal->j_private;
106 err = handle->h_err;
107 rc = journal_stop(handle);
108
109 if (!err)
110 err = rc;
111 if (err)
112 __ext3_std_error(sb, where, err);
113 return err;
114}
115
116void ext3_journal_abort_handle(const char *caller, const char *err_fn,
117 struct buffer_head *bh, handle_t *handle, int err)
118{
119 char nbuf[16];
120 const char *errstr = ext3_decode_error(NULL, err, nbuf);
121
122 if (bh)
123 BUFFER_TRACE(bh, "abort");
124
125 if (!handle->h_err)
126 handle->h_err = err;
127
128 if (is_handle_aborted(handle))
129 return;
130
131 printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
132 caller, errstr, err_fn);
133
134 journal_abort_handle(handle);
135}
136
137void ext3_msg(struct super_block *sb, const char *prefix,
138 const char *fmt, ...)
139{
140 struct va_format vaf;
141 va_list args;
142
143 va_start(args, fmt);
144
145 vaf.fmt = fmt;
146 vaf.va = &args;
147
148 printk("%sEXT3-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
149
150 va_end(args);
151}
152
153/* Deal with the reporting of failure conditions on a filesystem such as
154 * inconsistencies detected or read IO failures.
155 *
156 * On ext2, we can store the error state of the filesystem in the
157 * superblock. That is not possible on ext3, because we may have other
158 * write ordering constraints on the superblock which prevent us from
159 * writing it out straight away; and given that the journal is about to
160 * be aborted, we can't rely on the current, or future, transactions to
161 * write out the superblock safely.
162 *
163 * We'll just use the journal_abort() error code to record an error in
164 * the journal instead. On recovery, the journal will complain about
165 * that error until we've noted it down and cleared it.
166 */
167
168static void ext3_handle_error(struct super_block *sb)
169{
170 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
171
172 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
173 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
174
175 if (sb->s_flags & MS_RDONLY)
176 return;
177
178 if (!test_opt (sb, ERRORS_CONT)) {
179 journal_t *journal = EXT3_SB(sb)->s_journal;
180
181 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
182 if (journal)
183 journal_abort(journal, -EIO);
184 }
185 if (test_opt (sb, ERRORS_RO)) {
186 ext3_msg(sb, KERN_CRIT,
187 "error: remounting filesystem read-only");
188 sb->s_flags |= MS_RDONLY;
189 }
190 ext3_commit_super(sb, es, 1);
191 if (test_opt(sb, ERRORS_PANIC))
192 panic("EXT3-fs (%s): panic forced after error\n",
193 sb->s_id);
194}
195
196void ext3_error(struct super_block *sb, const char *function,
197 const char *fmt, ...)
198{
199 struct va_format vaf;
200 va_list args;
201
202 va_start(args, fmt);
203
204 vaf.fmt = fmt;
205 vaf.va = &args;
206
207 printk(KERN_CRIT "EXT3-fs error (device %s): %s: %pV\n",
208 sb->s_id, function, &vaf);
209
210 va_end(args);
211
212 ext3_handle_error(sb);
213}
214
215static const char *ext3_decode_error(struct super_block * sb, int errno,
216 char nbuf[16])
217{
218 char *errstr = NULL;
219
220 switch (errno) {
221 case -EIO:
222 errstr = "IO failure";
223 break;
224 case -ENOMEM:
225 errstr = "Out of memory";
226 break;
227 case -EROFS:
228 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
229 errstr = "Journal has aborted";
230 else
231 errstr = "Readonly filesystem";
232 break;
233 default:
234 /* If the caller passed in an extra buffer for unknown
235 * errors, textualise them now. Else we just return
236 * NULL. */
237 if (nbuf) {
238 /* Check for truncated error codes... */
239 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
240 errstr = nbuf;
241 }
242 break;
243 }
244
245 return errstr;
246}
247
248/* __ext3_std_error decodes expected errors from journaling functions
249 * automatically and invokes the appropriate error response. */
250
251void __ext3_std_error (struct super_block * sb, const char * function,
252 int errno)
253{
254 char nbuf[16];
255 const char *errstr;
256
257 /* Special case: if the error is EROFS, and we're not already
258 * inside a transaction, then there's really no point in logging
259 * an error. */
260 if (errno == -EROFS && journal_current_handle() == NULL &&
261 (sb->s_flags & MS_RDONLY))
262 return;
263
264 errstr = ext3_decode_error(sb, errno, nbuf);
265 ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
266
267 ext3_handle_error(sb);
268}
269
270/*
271 * ext3_abort is a much stronger failure handler than ext3_error. The
272 * abort function may be used to deal with unrecoverable failures such
273 * as journal IO errors or ENOMEM at a critical moment in log management.
274 *
275 * We unconditionally force the filesystem into an ABORT|READONLY state,
276 * unless the error response on the fs has been set to panic in which
277 * case we take the easy way out and panic immediately.
278 */
279
280void ext3_abort(struct super_block *sb, const char *function,
281 const char *fmt, ...)
282{
283 struct va_format vaf;
284 va_list args;
285
286 va_start(args, fmt);
287
288 vaf.fmt = fmt;
289 vaf.va = &args;
290
291 printk(KERN_CRIT "EXT3-fs (%s): error: %s: %pV\n",
292 sb->s_id, function, &vaf);
293
294 va_end(args);
295
296 if (test_opt(sb, ERRORS_PANIC))
297 panic("EXT3-fs: panic from previous error\n");
298
299 if (sb->s_flags & MS_RDONLY)
300 return;
301
302 ext3_msg(sb, KERN_CRIT,
303 "error: remounting filesystem read-only");
304 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
305 sb->s_flags |= MS_RDONLY;
306 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
307 if (EXT3_SB(sb)->s_journal)
308 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
309}
310
311void ext3_warning(struct super_block *sb, const char *function,
312 const char *fmt, ...)
313{
314 struct va_format vaf;
315 va_list args;
316
317 va_start(args, fmt);
318
319 vaf.fmt = fmt;
320 vaf.va = &args;
321
322 printk(KERN_WARNING "EXT3-fs (%s): warning: %s: %pV\n",
323 sb->s_id, function, &vaf);
324
325 va_end(args);
326}
327
328void ext3_update_dynamic_rev(struct super_block *sb)
329{
330 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
331
332 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
333 return;
334
335 ext3_msg(sb, KERN_WARNING,
336 "warning: updating to rev %d because of "
337 "new feature flag, running e2fsck is recommended",
338 EXT3_DYNAMIC_REV);
339
340 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
341 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
342 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
343 /* leave es->s_feature_*compat flags alone */
344 /* es->s_uuid will be set by e2fsck if empty */
345
346 /*
347 * The rest of the superblock fields should be zero, and if not it
348 * means they are likely already in use, so leave them alone. We
349 * can leave it up to e2fsck to clean up any inconsistencies there.
350 */
351}
352
353/*
354 * Open the external journal device
355 */
356static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
357{
358 struct block_device *bdev;
359 char b[BDEVNAME_SIZE];
360
361 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
362 if (IS_ERR(bdev))
363 goto fail;
364 return bdev;
365
366fail:
367 ext3_msg(sb, "error: failed to open journal device %s: %ld",
368 __bdevname(dev, b), PTR_ERR(bdev));
369
370 return NULL;
371}
372
373/*
374 * Release the journal device
375 */
376static int ext3_blkdev_put(struct block_device *bdev)
377{
378 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
379}
380
381static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
382{
383 struct block_device *bdev;
384 int ret = -ENODEV;
385
386 bdev = sbi->journal_bdev;
387 if (bdev) {
388 ret = ext3_blkdev_put(bdev);
389 sbi->journal_bdev = NULL;
390 }
391 return ret;
392}
393
394static inline struct inode *orphan_list_entry(struct list_head *l)
395{
396 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
397}
398
399static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
400{
401 struct list_head *l;
402
403 ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
404 le32_to_cpu(sbi->s_es->s_last_orphan));
405
406 ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
407 list_for_each(l, &sbi->s_orphan) {
408 struct inode *inode = orphan_list_entry(l);
409 ext3_msg(sb, KERN_ERR, " "
410 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
411 inode->i_sb->s_id, inode->i_ino, inode,
412 inode->i_mode, inode->i_nlink,
413 NEXT_ORPHAN(inode));
414 }
415}
416
417static void ext3_put_super (struct super_block * sb)
418{
419 struct ext3_sb_info *sbi = EXT3_SB(sb);
420 struct ext3_super_block *es = sbi->s_es;
421 int i, err;
422
423 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
424 ext3_xattr_put_super(sb);
425 err = journal_destroy(sbi->s_journal);
426 sbi->s_journal = NULL;
427 if (err < 0)
428 ext3_abort(sb, __func__, "Couldn't clean up the journal");
429
430 if (!(sb->s_flags & MS_RDONLY)) {
431 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
432 es->s_state = cpu_to_le16(sbi->s_mount_state);
433 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
434 mark_buffer_dirty(sbi->s_sbh);
435 ext3_commit_super(sb, es, 1);
436 }
437
438 for (i = 0; i < sbi->s_gdb_count; i++)
439 brelse(sbi->s_group_desc[i]);
440 kfree(sbi->s_group_desc);
441 percpu_counter_destroy(&sbi->s_freeblocks_counter);
442 percpu_counter_destroy(&sbi->s_freeinodes_counter);
443 percpu_counter_destroy(&sbi->s_dirs_counter);
444 brelse(sbi->s_sbh);
445#ifdef CONFIG_QUOTA
446 for (i = 0; i < MAXQUOTAS; i++)
447 kfree(sbi->s_qf_names[i]);
448#endif
449
450 /* Debugging code just in case the in-memory inode orphan list
451 * isn't empty. The on-disk one can be non-empty if we've
452 * detected an error and taken the fs readonly, but the
453 * in-memory list had better be clean by this point. */
454 if (!list_empty(&sbi->s_orphan))
455 dump_orphan_list(sb, sbi);
456 J_ASSERT(list_empty(&sbi->s_orphan));
457
458 invalidate_bdev(sb->s_bdev);
459 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
460 /*
461 * Invalidate the journal device's buffers. We don't want them
462 * floating about in memory - the physical journal device may
463 * hotswapped, and it breaks the `ro-after' testing code.
464 */
465 sync_blockdev(sbi->journal_bdev);
466 invalidate_bdev(sbi->journal_bdev);
467 ext3_blkdev_remove(sbi);
468 }
469 sb->s_fs_info = NULL;
470 kfree(sbi->s_blockgroup_lock);
471 kfree(sbi);
472}
473
474static struct kmem_cache *ext3_inode_cachep;
475
476/*
477 * Called inside transaction, so use GFP_NOFS
478 */
479static struct inode *ext3_alloc_inode(struct super_block *sb)
480{
481 struct ext3_inode_info *ei;
482
483 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
484 if (!ei)
485 return NULL;
486 ei->i_block_alloc_info = NULL;
487 ei->vfs_inode.i_version = 1;
488 atomic_set(&ei->i_datasync_tid, 0);
489 atomic_set(&ei->i_sync_tid, 0);
490 return &ei->vfs_inode;
491}
492
493static int ext3_drop_inode(struct inode *inode)
494{
495 int drop = generic_drop_inode(inode);
496
497 trace_ext3_drop_inode(inode, drop);
498 return drop;
499}
500
501static void ext3_i_callback(struct rcu_head *head)
502{
503 struct inode *inode = container_of(head, struct inode, i_rcu);
504 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
505}
506
507static void ext3_destroy_inode(struct inode *inode)
508{
509 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
510 printk("EXT3 Inode %p: orphan list check failed!\n",
511 EXT3_I(inode));
512 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
513 EXT3_I(inode), sizeof(struct ext3_inode_info),
514 false);
515 dump_stack();
516 }
517 call_rcu(&inode->i_rcu, ext3_i_callback);
518}
519
520static void init_once(void *foo)
521{
522 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
523
524 INIT_LIST_HEAD(&ei->i_orphan);
525#ifdef CONFIG_EXT3_FS_XATTR
526 init_rwsem(&ei->xattr_sem);
527#endif
528 mutex_init(&ei->truncate_mutex);
529 inode_init_once(&ei->vfs_inode);
530}
531
532static int init_inodecache(void)
533{
534 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
535 sizeof(struct ext3_inode_info),
536 0, (SLAB_RECLAIM_ACCOUNT|
537 SLAB_MEM_SPREAD),
538 init_once);
539 if (ext3_inode_cachep == NULL)
540 return -ENOMEM;
541 return 0;
542}
543
544static void destroy_inodecache(void)
545{
546 kmem_cache_destroy(ext3_inode_cachep);
547}
548
549static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
550{
551#if defined(CONFIG_QUOTA)
552 struct ext3_sb_info *sbi = EXT3_SB(sb);
553
554 if (sbi->s_jquota_fmt) {
555 char *fmtname = "";
556
557 switch (sbi->s_jquota_fmt) {
558 case QFMT_VFS_OLD:
559 fmtname = "vfsold";
560 break;
561 case QFMT_VFS_V0:
562 fmtname = "vfsv0";
563 break;
564 case QFMT_VFS_V1:
565 fmtname = "vfsv1";
566 break;
567 }
568 seq_printf(seq, ",jqfmt=%s", fmtname);
569 }
570
571 if (sbi->s_qf_names[USRQUOTA])
572 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
573
574 if (sbi->s_qf_names[GRPQUOTA])
575 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
576
577 if (test_opt(sb, USRQUOTA))
578 seq_puts(seq, ",usrquota");
579
580 if (test_opt(sb, GRPQUOTA))
581 seq_puts(seq, ",grpquota");
582#endif
583}
584
585static char *data_mode_string(unsigned long mode)
586{
587 switch (mode) {
588 case EXT3_MOUNT_JOURNAL_DATA:
589 return "journal";
590 case EXT3_MOUNT_ORDERED_DATA:
591 return "ordered";
592 case EXT3_MOUNT_WRITEBACK_DATA:
593 return "writeback";
594 }
595 return "unknown";
596}
597
598/*
599 * Show an option if
600 * - it's set to a non-default value OR
601 * - if the per-sb default is different from the global default
602 */
603static int ext3_show_options(struct seq_file *seq, struct dentry *root)
604{
605 struct super_block *sb = root->d_sb;
606 struct ext3_sb_info *sbi = EXT3_SB(sb);
607 struct ext3_super_block *es = sbi->s_es;
608 unsigned long def_mount_opts;
609
610 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
611
612 if (sbi->s_sb_block != 1)
613 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
614 if (test_opt(sb, MINIX_DF))
615 seq_puts(seq, ",minixdf");
616 if (test_opt(sb, GRPID))
617 seq_puts(seq, ",grpid");
618 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
619 seq_puts(seq, ",nogrpid");
620 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT3_DEF_RESUID)) ||
621 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
622 seq_printf(seq, ",resuid=%u",
623 from_kuid_munged(&init_user_ns, sbi->s_resuid));
624 }
625 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT3_DEF_RESGID)) ||
626 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
627 seq_printf(seq, ",resgid=%u",
628 from_kgid_munged(&init_user_ns, sbi->s_resgid));
629 }
630 if (test_opt(sb, ERRORS_RO)) {
631 int def_errors = le16_to_cpu(es->s_errors);
632
633 if (def_errors == EXT3_ERRORS_PANIC ||
634 def_errors == EXT3_ERRORS_CONTINUE) {
635 seq_puts(seq, ",errors=remount-ro");
636 }
637 }
638 if (test_opt(sb, ERRORS_CONT))
639 seq_puts(seq, ",errors=continue");
640 if (test_opt(sb, ERRORS_PANIC))
641 seq_puts(seq, ",errors=panic");
642 if (test_opt(sb, NO_UID32))
643 seq_puts(seq, ",nouid32");
644 if (test_opt(sb, DEBUG))
645 seq_puts(seq, ",debug");
646#ifdef CONFIG_EXT3_FS_XATTR
647 if (test_opt(sb, XATTR_USER))
648 seq_puts(seq, ",user_xattr");
649 if (!test_opt(sb, XATTR_USER) &&
650 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
651 seq_puts(seq, ",nouser_xattr");
652 }
653#endif
654#ifdef CONFIG_EXT3_FS_POSIX_ACL
655 if (test_opt(sb, POSIX_ACL))
656 seq_puts(seq, ",acl");
657 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
658 seq_puts(seq, ",noacl");
659#endif
660 if (!test_opt(sb, RESERVATION))
661 seq_puts(seq, ",noreservation");
662 if (sbi->s_commit_interval) {
663 seq_printf(seq, ",commit=%u",
664 (unsigned) (sbi->s_commit_interval / HZ));
665 }
666
667 /*
668 * Always display barrier state so it's clear what the status is.
669 */
670 seq_puts(seq, ",barrier=");
671 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
672 seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
673 if (test_opt(sb, DATA_ERR_ABORT))
674 seq_puts(seq, ",data_err=abort");
675
676 if (test_opt(sb, NOLOAD))
677 seq_puts(seq, ",norecovery");
678
679 ext3_show_quota_options(seq, sb);
680
681 return 0;
682}
683
684
685static struct inode *ext3_nfs_get_inode(struct super_block *sb,
686 u64 ino, u32 generation)
687{
688 struct inode *inode;
689
690 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
691 return ERR_PTR(-ESTALE);
692 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
693 return ERR_PTR(-ESTALE);
694
695 /* iget isn't really right if the inode is currently unallocated!!
696 *
697 * ext3_read_inode will return a bad_inode if the inode had been
698 * deleted, so we should be safe.
699 *
700 * Currently we don't know the generation for parent directory, so
701 * a generation of 0 means "accept any"
702 */
703 inode = ext3_iget(sb, ino);
704 if (IS_ERR(inode))
705 return ERR_CAST(inode);
706 if (generation && inode->i_generation != generation) {
707 iput(inode);
708 return ERR_PTR(-ESTALE);
709 }
710
711 return inode;
712}
713
714static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
715 int fh_len, int fh_type)
716{
717 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
718 ext3_nfs_get_inode);
719}
720
721static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
722 int fh_len, int fh_type)
723{
724 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
725 ext3_nfs_get_inode);
726}
727
728/*
729 * Try to release metadata pages (indirect blocks, directories) which are
730 * mapped via the block device. Since these pages could have journal heads
731 * which would prevent try_to_free_buffers() from freeing them, we must use
732 * jbd layer's try_to_free_buffers() function to release them.
733 */
734static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
735 gfp_t wait)
736{
737 journal_t *journal = EXT3_SB(sb)->s_journal;
738
739 WARN_ON(PageChecked(page));
740 if (!page_has_buffers(page))
741 return 0;
742 if (journal)
743 return journal_try_to_free_buffers(journal, page,
744 wait & ~__GFP_WAIT);
745 return try_to_free_buffers(page);
746}
747
748#ifdef CONFIG_QUOTA
749#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
750#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
751
752static int ext3_write_dquot(struct dquot *dquot);
753static int ext3_acquire_dquot(struct dquot *dquot);
754static int ext3_release_dquot(struct dquot *dquot);
755static int ext3_mark_dquot_dirty(struct dquot *dquot);
756static int ext3_write_info(struct super_block *sb, int type);
757static int ext3_quota_on(struct super_block *sb, int type, int format_id,
758 struct path *path);
759static int ext3_quota_on_mount(struct super_block *sb, int type);
760static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
761 size_t len, loff_t off);
762static ssize_t ext3_quota_write(struct super_block *sb, int type,
763 const char *data, size_t len, loff_t off);
764
765static const struct dquot_operations ext3_quota_operations = {
766 .write_dquot = ext3_write_dquot,
767 .acquire_dquot = ext3_acquire_dquot,
768 .release_dquot = ext3_release_dquot,
769 .mark_dirty = ext3_mark_dquot_dirty,
770 .write_info = ext3_write_info,
771 .alloc_dquot = dquot_alloc,
772 .destroy_dquot = dquot_destroy,
773};
774
775static const struct quotactl_ops ext3_qctl_operations = {
776 .quota_on = ext3_quota_on,
777 .quota_off = dquot_quota_off,
778 .quota_sync = dquot_quota_sync,
779 .get_info = dquot_get_dqinfo,
780 .set_info = dquot_set_dqinfo,
781 .get_dqblk = dquot_get_dqblk,
782 .set_dqblk = dquot_set_dqblk
783};
784#endif
785
786static const struct super_operations ext3_sops = {
787 .alloc_inode = ext3_alloc_inode,
788 .destroy_inode = ext3_destroy_inode,
789 .write_inode = ext3_write_inode,
790 .dirty_inode = ext3_dirty_inode,
791 .drop_inode = ext3_drop_inode,
792 .evict_inode = ext3_evict_inode,
793 .put_super = ext3_put_super,
794 .sync_fs = ext3_sync_fs,
795 .freeze_fs = ext3_freeze,
796 .unfreeze_fs = ext3_unfreeze,
797 .statfs = ext3_statfs,
798 .remount_fs = ext3_remount,
799 .show_options = ext3_show_options,
800#ifdef CONFIG_QUOTA
801 .quota_read = ext3_quota_read,
802 .quota_write = ext3_quota_write,
803#endif
804 .bdev_try_to_free_page = bdev_try_to_free_page,
805};
806
807static const struct export_operations ext3_export_ops = {
808 .fh_to_dentry = ext3_fh_to_dentry,
809 .fh_to_parent = ext3_fh_to_parent,
810 .get_parent = ext3_get_parent,
811};
812
813enum {
814 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
815 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
816 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
817 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
818 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
819 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
820 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
821 Opt_data_err_abort, Opt_data_err_ignore,
822 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
823 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
824 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
825 Opt_resize, Opt_usrquota, Opt_grpquota
826};
827
828static const match_table_t tokens = {
829 {Opt_bsd_df, "bsddf"},
830 {Opt_minix_df, "minixdf"},
831 {Opt_grpid, "grpid"},
832 {Opt_grpid, "bsdgroups"},
833 {Opt_nogrpid, "nogrpid"},
834 {Opt_nogrpid, "sysvgroups"},
835 {Opt_resgid, "resgid=%u"},
836 {Opt_resuid, "resuid=%u"},
837 {Opt_sb, "sb=%u"},
838 {Opt_err_cont, "errors=continue"},
839 {Opt_err_panic, "errors=panic"},
840 {Opt_err_ro, "errors=remount-ro"},
841 {Opt_nouid32, "nouid32"},
842 {Opt_nocheck, "nocheck"},
843 {Opt_nocheck, "check=none"},
844 {Opt_debug, "debug"},
845 {Opt_oldalloc, "oldalloc"},
846 {Opt_orlov, "orlov"},
847 {Opt_user_xattr, "user_xattr"},
848 {Opt_nouser_xattr, "nouser_xattr"},
849 {Opt_acl, "acl"},
850 {Opt_noacl, "noacl"},
851 {Opt_reservation, "reservation"},
852 {Opt_noreservation, "noreservation"},
853 {Opt_noload, "noload"},
854 {Opt_noload, "norecovery"},
855 {Opt_nobh, "nobh"},
856 {Opt_bh, "bh"},
857 {Opt_commit, "commit=%u"},
858 {Opt_journal_update, "journal=update"},
859 {Opt_journal_inum, "journal=%u"},
860 {Opt_journal_dev, "journal_dev=%u"},
861 {Opt_abort, "abort"},
862 {Opt_data_journal, "data=journal"},
863 {Opt_data_ordered, "data=ordered"},
864 {Opt_data_writeback, "data=writeback"},
865 {Opt_data_err_abort, "data_err=abort"},
866 {Opt_data_err_ignore, "data_err=ignore"},
867 {Opt_offusrjquota, "usrjquota="},
868 {Opt_usrjquota, "usrjquota=%s"},
869 {Opt_offgrpjquota, "grpjquota="},
870 {Opt_grpjquota, "grpjquota=%s"},
871 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
872 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
873 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
874 {Opt_grpquota, "grpquota"},
875 {Opt_noquota, "noquota"},
876 {Opt_quota, "quota"},
877 {Opt_usrquota, "usrquota"},
878 {Opt_barrier, "barrier=%u"},
879 {Opt_barrier, "barrier"},
880 {Opt_nobarrier, "nobarrier"},
881 {Opt_resize, "resize"},
882 {Opt_err, NULL},
883};
884
885static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
886{
887 ext3_fsblk_t sb_block;
888 char *options = (char *) *data;
889
890 if (!options || strncmp(options, "sb=", 3) != 0)
891 return 1; /* Default location */
892 options += 3;
893 /*todo: use simple_strtoll with >32bit ext3 */
894 sb_block = simple_strtoul(options, &options, 0);
895 if (*options && *options != ',') {
896 ext3_msg(sb, "error: invalid sb specification: %s",
897 (char *) *data);
898 return 1;
899 }
900 if (*options == ',')
901 options++;
902 *data = (void *) options;
903 return sb_block;
904}
905
906#ifdef CONFIG_QUOTA
907static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
908{
909 struct ext3_sb_info *sbi = EXT3_SB(sb);
910 char *qname;
911
912 if (sb_any_quota_loaded(sb) &&
913 !sbi->s_qf_names[qtype]) {
914 ext3_msg(sb, KERN_ERR,
915 "Cannot change journaled "
916 "quota options when quota turned on");
917 return 0;
918 }
919 qname = match_strdup(args);
920 if (!qname) {
921 ext3_msg(sb, KERN_ERR,
922 "Not enough memory for storing quotafile name");
923 return 0;
924 }
925 if (sbi->s_qf_names[qtype] &&
926 strcmp(sbi->s_qf_names[qtype], qname)) {
927 ext3_msg(sb, KERN_ERR,
928 "%s quota file already specified", QTYPE2NAME(qtype));
929 kfree(qname);
930 return 0;
931 }
932 sbi->s_qf_names[qtype] = qname;
933 if (strchr(sbi->s_qf_names[qtype], '/')) {
934 ext3_msg(sb, KERN_ERR,
935 "quotafile must be on filesystem root");
936 kfree(sbi->s_qf_names[qtype]);
937 sbi->s_qf_names[qtype] = NULL;
938 return 0;
939 }
940 set_opt(sbi->s_mount_opt, QUOTA);
941 return 1;
942}
943
944static int clear_qf_name(struct super_block *sb, int qtype) {
945
946 struct ext3_sb_info *sbi = EXT3_SB(sb);
947
948 if (sb_any_quota_loaded(sb) &&
949 sbi->s_qf_names[qtype]) {
950 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
951 " when quota turned on");
952 return 0;
953 }
954 /*
955 * The space will be released later when all options are confirmed
956 * to be correct
957 */
958 sbi->s_qf_names[qtype] = NULL;
959 return 1;
960}
961#endif
962
963static int parse_options (char *options, struct super_block *sb,
964 unsigned int *inum, unsigned long *journal_devnum,
965 ext3_fsblk_t *n_blocks_count, int is_remount)
966{
967 struct ext3_sb_info *sbi = EXT3_SB(sb);
968 char * p;
969 substring_t args[MAX_OPT_ARGS];
970 int data_opt = 0;
971 int option;
972 kuid_t uid;
973 kgid_t gid;
974#ifdef CONFIG_QUOTA
975 int qfmt;
976#endif
977
978 if (!options)
979 return 1;
980
981 while ((p = strsep (&options, ",")) != NULL) {
982 int token;
983 if (!*p)
984 continue;
985 /*
986 * Initialize args struct so we know whether arg was
987 * found; some options take optional arguments.
988 */
989 args[0].to = args[0].from = 0;
990 token = match_token(p, tokens, args);
991 switch (token) {
992 case Opt_bsd_df:
993 clear_opt (sbi->s_mount_opt, MINIX_DF);
994 break;
995 case Opt_minix_df:
996 set_opt (sbi->s_mount_opt, MINIX_DF);
997 break;
998 case Opt_grpid:
999 set_opt (sbi->s_mount_opt, GRPID);
1000 break;
1001 case Opt_nogrpid:
1002 clear_opt (sbi->s_mount_opt, GRPID);
1003 break;
1004 case Opt_resuid:
1005 if (match_int(&args[0], &option))
1006 return 0;
1007 uid = make_kuid(current_user_ns(), option);
1008 if (!uid_valid(uid)) {
1009 ext3_msg(sb, KERN_ERR, "Invalid uid value %d", option);
1010 return -1;
1011
1012 }
1013 sbi->s_resuid = uid;
1014 break;
1015 case Opt_resgid:
1016 if (match_int(&args[0], &option))
1017 return 0;
1018 gid = make_kgid(current_user_ns(), option);
1019 if (!gid_valid(gid)) {
1020 ext3_msg(sb, KERN_ERR, "Invalid gid value %d", option);
1021 return -1;
1022 }
1023 sbi->s_resgid = gid;
1024 break;
1025 case Opt_sb:
1026 /* handled by get_sb_block() instead of here */
1027 /* *sb_block = match_int(&args[0]); */
1028 break;
1029 case Opt_err_panic:
1030 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1031 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1032 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1033 break;
1034 case Opt_err_ro:
1035 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1036 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1037 set_opt (sbi->s_mount_opt, ERRORS_RO);
1038 break;
1039 case Opt_err_cont:
1040 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1041 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1042 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1043 break;
1044 case Opt_nouid32:
1045 set_opt (sbi->s_mount_opt, NO_UID32);
1046 break;
1047 case Opt_nocheck:
1048 clear_opt (sbi->s_mount_opt, CHECK);
1049 break;
1050 case Opt_debug:
1051 set_opt (sbi->s_mount_opt, DEBUG);
1052 break;
1053 case Opt_oldalloc:
1054 ext3_msg(sb, KERN_WARNING,
1055 "Ignoring deprecated oldalloc option");
1056 break;
1057 case Opt_orlov:
1058 ext3_msg(sb, KERN_WARNING,
1059 "Ignoring deprecated orlov option");
1060 break;
1061#ifdef CONFIG_EXT3_FS_XATTR
1062 case Opt_user_xattr:
1063 set_opt (sbi->s_mount_opt, XATTR_USER);
1064 break;
1065 case Opt_nouser_xattr:
1066 clear_opt (sbi->s_mount_opt, XATTR_USER);
1067 break;
1068#else
1069 case Opt_user_xattr:
1070 case Opt_nouser_xattr:
1071 ext3_msg(sb, KERN_INFO,
1072 "(no)user_xattr options not supported");
1073 break;
1074#endif
1075#ifdef CONFIG_EXT3_FS_POSIX_ACL
1076 case Opt_acl:
1077 set_opt(sbi->s_mount_opt, POSIX_ACL);
1078 break;
1079 case Opt_noacl:
1080 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1081 break;
1082#else
1083 case Opt_acl:
1084 case Opt_noacl:
1085 ext3_msg(sb, KERN_INFO,
1086 "(no)acl options not supported");
1087 break;
1088#endif
1089 case Opt_reservation:
1090 set_opt(sbi->s_mount_opt, RESERVATION);
1091 break;
1092 case Opt_noreservation:
1093 clear_opt(sbi->s_mount_opt, RESERVATION);
1094 break;
1095 case Opt_journal_update:
1096 /* @@@ FIXME */
1097 /* Eventually we will want to be able to create
1098 a journal file here. For now, only allow the
1099 user to specify an existing inode to be the
1100 journal file. */
1101 if (is_remount) {
1102 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1103 "journal on remount");
1104 return 0;
1105 }
1106 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1107 break;
1108 case Opt_journal_inum:
1109 if (is_remount) {
1110 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1111 "journal on remount");
1112 return 0;
1113 }
1114 if (match_int(&args[0], &option))
1115 return 0;
1116 *inum = option;
1117 break;
1118 case Opt_journal_dev:
1119 if (is_remount) {
1120 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1121 "journal on remount");
1122 return 0;
1123 }
1124 if (match_int(&args[0], &option))
1125 return 0;
1126 *journal_devnum = option;
1127 break;
1128 case Opt_noload:
1129 set_opt (sbi->s_mount_opt, NOLOAD);
1130 break;
1131 case Opt_commit:
1132 if (match_int(&args[0], &option))
1133 return 0;
1134 if (option < 0)
1135 return 0;
1136 if (option == 0)
1137 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1138 sbi->s_commit_interval = HZ * option;
1139 break;
1140 case Opt_data_journal:
1141 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1142 goto datacheck;
1143 case Opt_data_ordered:
1144 data_opt = EXT3_MOUNT_ORDERED_DATA;
1145 goto datacheck;
1146 case Opt_data_writeback:
1147 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1148 datacheck:
1149 if (is_remount) {
1150 if (test_opt(sb, DATA_FLAGS) == data_opt)
1151 break;
1152 ext3_msg(sb, KERN_ERR,
1153 "error: cannot change "
1154 "data mode on remount. The filesystem "
1155 "is mounted in data=%s mode and you "
1156 "try to remount it in data=%s mode.",
1157 data_mode_string(test_opt(sb,
1158 DATA_FLAGS)),
1159 data_mode_string(data_opt));
1160 return 0;
1161 } else {
1162 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1163 sbi->s_mount_opt |= data_opt;
1164 }
1165 break;
1166 case Opt_data_err_abort:
1167 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1168 break;
1169 case Opt_data_err_ignore:
1170 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1171 break;
1172#ifdef CONFIG_QUOTA
1173 case Opt_usrjquota:
1174 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1175 return 0;
1176 break;
1177 case Opt_grpjquota:
1178 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1179 return 0;
1180 break;
1181 case Opt_offusrjquota:
1182 if (!clear_qf_name(sb, USRQUOTA))
1183 return 0;
1184 break;
1185 case Opt_offgrpjquota:
1186 if (!clear_qf_name(sb, GRPQUOTA))
1187 return 0;
1188 break;
1189 case Opt_jqfmt_vfsold:
1190 qfmt = QFMT_VFS_OLD;
1191 goto set_qf_format;
1192 case Opt_jqfmt_vfsv0:
1193 qfmt = QFMT_VFS_V0;
1194 goto set_qf_format;
1195 case Opt_jqfmt_vfsv1:
1196 qfmt = QFMT_VFS_V1;
1197set_qf_format:
1198 if (sb_any_quota_loaded(sb) &&
1199 sbi->s_jquota_fmt != qfmt) {
1200 ext3_msg(sb, KERN_ERR, "error: cannot change "
1201 "journaled quota options when "
1202 "quota turned on.");
1203 return 0;
1204 }
1205 sbi->s_jquota_fmt = qfmt;
1206 break;
1207 case Opt_quota:
1208 case Opt_usrquota:
1209 set_opt(sbi->s_mount_opt, QUOTA);
1210 set_opt(sbi->s_mount_opt, USRQUOTA);
1211 break;
1212 case Opt_grpquota:
1213 set_opt(sbi->s_mount_opt, QUOTA);
1214 set_opt(sbi->s_mount_opt, GRPQUOTA);
1215 break;
1216 case Opt_noquota:
1217 if (sb_any_quota_loaded(sb)) {
1218 ext3_msg(sb, KERN_ERR, "error: cannot change "
1219 "quota options when quota turned on.");
1220 return 0;
1221 }
1222 clear_opt(sbi->s_mount_opt, QUOTA);
1223 clear_opt(sbi->s_mount_opt, USRQUOTA);
1224 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1225 break;
1226#else
1227 case Opt_quota:
1228 case Opt_usrquota:
1229 case Opt_grpquota:
1230 ext3_msg(sb, KERN_ERR,
1231 "error: quota options not supported.");
1232 break;
1233 case Opt_usrjquota:
1234 case Opt_grpjquota:
1235 case Opt_offusrjquota:
1236 case Opt_offgrpjquota:
1237 case Opt_jqfmt_vfsold:
1238 case Opt_jqfmt_vfsv0:
1239 case Opt_jqfmt_vfsv1:
1240 ext3_msg(sb, KERN_ERR,
1241 "error: journaled quota options not "
1242 "supported.");
1243 break;
1244 case Opt_noquota:
1245 break;
1246#endif
1247 case Opt_abort:
1248 set_opt(sbi->s_mount_opt, ABORT);
1249 break;
1250 case Opt_nobarrier:
1251 clear_opt(sbi->s_mount_opt, BARRIER);
1252 break;
1253 case Opt_barrier:
1254 if (args[0].from) {
1255 if (match_int(&args[0], &option))
1256 return 0;
1257 } else
1258 option = 1; /* No argument, default to 1 */
1259 if (option)
1260 set_opt(sbi->s_mount_opt, BARRIER);
1261 else
1262 clear_opt(sbi->s_mount_opt, BARRIER);
1263 break;
1264 case Opt_ignore:
1265 break;
1266 case Opt_resize:
1267 if (!is_remount) {
1268 ext3_msg(sb, KERN_ERR,
1269 "error: resize option only available "
1270 "for remount");
1271 return 0;
1272 }
1273 if (match_int(&args[0], &option) != 0)
1274 return 0;
1275 *n_blocks_count = option;
1276 break;
1277 case Opt_nobh:
1278 ext3_msg(sb, KERN_WARNING,
1279 "warning: ignoring deprecated nobh option");
1280 break;
1281 case Opt_bh:
1282 ext3_msg(sb, KERN_WARNING,
1283 "warning: ignoring deprecated bh option");
1284 break;
1285 default:
1286 ext3_msg(sb, KERN_ERR,
1287 "error: unrecognized mount option \"%s\" "
1288 "or missing value", p);
1289 return 0;
1290 }
1291 }
1292#ifdef CONFIG_QUOTA
1293 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1294 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1295 clear_opt(sbi->s_mount_opt, USRQUOTA);
1296 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1297 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1298
1299 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1300 ext3_msg(sb, KERN_ERR, "error: old and new quota "
1301 "format mixing.");
1302 return 0;
1303 }
1304
1305 if (!sbi->s_jquota_fmt) {
1306 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1307 "not specified.");
1308 return 0;
1309 }
1310 } else {
1311 if (sbi->s_jquota_fmt) {
1312 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1313 "specified with no journaling "
1314 "enabled.");
1315 return 0;
1316 }
1317 }
1318#endif
1319 return 1;
1320}
1321
1322static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1323 int read_only)
1324{
1325 struct ext3_sb_info *sbi = EXT3_SB(sb);
1326 int res = 0;
1327
1328 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1329 ext3_msg(sb, KERN_ERR,
1330 "error: revision level too high, "
1331 "forcing read-only mode");
1332 res = MS_RDONLY;
1333 }
1334 if (read_only)
1335 return res;
1336 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1337 ext3_msg(sb, KERN_WARNING,
1338 "warning: mounting unchecked fs, "
1339 "running e2fsck is recommended");
1340 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1341 ext3_msg(sb, KERN_WARNING,
1342 "warning: mounting fs with errors, "
1343 "running e2fsck is recommended");
1344 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1345 le16_to_cpu(es->s_mnt_count) >=
1346 le16_to_cpu(es->s_max_mnt_count))
1347 ext3_msg(sb, KERN_WARNING,
1348 "warning: maximal mount count reached, "
1349 "running e2fsck is recommended");
1350 else if (le32_to_cpu(es->s_checkinterval) &&
1351 (le32_to_cpu(es->s_lastcheck) +
1352 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1353 ext3_msg(sb, KERN_WARNING,
1354 "warning: checktime reached, "
1355 "running e2fsck is recommended");
1356#if 0
1357 /* @@@ We _will_ want to clear the valid bit if we find
1358 inconsistencies, to force a fsck at reboot. But for
1359 a plain journaled filesystem we can keep it set as
1360 valid forever! :) */
1361 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1362#endif
1363 if (!le16_to_cpu(es->s_max_mnt_count))
1364 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1365 le16_add_cpu(&es->s_mnt_count, 1);
1366 es->s_mtime = cpu_to_le32(get_seconds());
1367 ext3_update_dynamic_rev(sb);
1368 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1369
1370 ext3_commit_super(sb, es, 1);
1371 if (test_opt(sb, DEBUG))
1372 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1373 "bpg=%lu, ipg=%lu, mo=%04lx]",
1374 sb->s_blocksize,
1375 sbi->s_groups_count,
1376 EXT3_BLOCKS_PER_GROUP(sb),
1377 EXT3_INODES_PER_GROUP(sb),
1378 sbi->s_mount_opt);
1379
1380 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1381 char b[BDEVNAME_SIZE];
1382 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1383 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1384 } else {
1385 ext3_msg(sb, KERN_INFO, "using internal journal");
1386 }
1387 cleancache_init_fs(sb);
1388 return res;
1389}
1390
1391/* Called at mount-time, super-block is locked */
1392static int ext3_check_descriptors(struct super_block *sb)
1393{
1394 struct ext3_sb_info *sbi = EXT3_SB(sb);
1395 int i;
1396
1397 ext3_debug ("Checking group descriptors");
1398
1399 for (i = 0; i < sbi->s_groups_count; i++) {
1400 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1401 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1402 ext3_fsblk_t last_block;
1403
1404 if (i == sbi->s_groups_count - 1)
1405 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1406 else
1407 last_block = first_block +
1408 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1409
1410 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1411 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1412 {
1413 ext3_error (sb, "ext3_check_descriptors",
1414 "Block bitmap for group %d"
1415 " not in group (block %lu)!",
1416 i, (unsigned long)
1417 le32_to_cpu(gdp->bg_block_bitmap));
1418 return 0;
1419 }
1420 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1421 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1422 {
1423 ext3_error (sb, "ext3_check_descriptors",
1424 "Inode bitmap for group %d"
1425 " not in group (block %lu)!",
1426 i, (unsigned long)
1427 le32_to_cpu(gdp->bg_inode_bitmap));
1428 return 0;
1429 }
1430 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1431 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1432 last_block)
1433 {
1434 ext3_error (sb, "ext3_check_descriptors",
1435 "Inode table for group %d"
1436 " not in group (block %lu)!",
1437 i, (unsigned long)
1438 le32_to_cpu(gdp->bg_inode_table));
1439 return 0;
1440 }
1441 }
1442
1443 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1444 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1445 return 1;
1446}
1447
1448
1449/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1450 * the superblock) which were deleted from all directories, but held open by
1451 * a process at the time of a crash. We walk the list and try to delete these
1452 * inodes at recovery time (only with a read-write filesystem).
1453 *
1454 * In order to keep the orphan inode chain consistent during traversal (in
1455 * case of crash during recovery), we link each inode into the superblock
1456 * orphan list_head and handle it the same way as an inode deletion during
1457 * normal operation (which journals the operations for us).
1458 *
1459 * We only do an iget() and an iput() on each inode, which is very safe if we
1460 * accidentally point at an in-use or already deleted inode. The worst that
1461 * can happen in this case is that we get a "bit already cleared" message from
1462 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1463 * e2fsck was run on this filesystem, and it must have already done the orphan
1464 * inode cleanup for us, so we can safely abort without any further action.
1465 */
1466static void ext3_orphan_cleanup (struct super_block * sb,
1467 struct ext3_super_block * es)
1468{
1469 unsigned int s_flags = sb->s_flags;
1470 int nr_orphans = 0, nr_truncates = 0;
1471#ifdef CONFIG_QUOTA
1472 int i;
1473#endif
1474 if (!es->s_last_orphan) {
1475 jbd_debug(4, "no orphan inodes to clean up\n");
1476 return;
1477 }
1478
1479 if (bdev_read_only(sb->s_bdev)) {
1480 ext3_msg(sb, KERN_ERR, "error: write access "
1481 "unavailable, skipping orphan cleanup.");
1482 return;
1483 }
1484
1485 /* Check if feature set allows readwrite operations */
1486 if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) {
1487 ext3_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
1488 "unknown ROCOMPAT features");
1489 return;
1490 }
1491
1492 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1493 if (es->s_last_orphan)
1494 jbd_debug(1, "Errors on filesystem, "
1495 "clearing orphan list.\n");
1496 es->s_last_orphan = 0;
1497 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1498 return;
1499 }
1500
1501 if (s_flags & MS_RDONLY) {
1502 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1503 sb->s_flags &= ~MS_RDONLY;
1504 }
1505#ifdef CONFIG_QUOTA
1506 /* Needed for iput() to work correctly and not trash data */
1507 sb->s_flags |= MS_ACTIVE;
1508 /* Turn on quotas so that they are updated correctly */
1509 for (i = 0; i < MAXQUOTAS; i++) {
1510 if (EXT3_SB(sb)->s_qf_names[i]) {
1511 int ret = ext3_quota_on_mount(sb, i);
1512 if (ret < 0)
1513 ext3_msg(sb, KERN_ERR,
1514 "error: cannot turn on journaled "
1515 "quota: %d", ret);
1516 }
1517 }
1518#endif
1519
1520 while (es->s_last_orphan) {
1521 struct inode *inode;
1522
1523 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1524 if (IS_ERR(inode)) {
1525 es->s_last_orphan = 0;
1526 break;
1527 }
1528
1529 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1530 dquot_initialize(inode);
1531 if (inode->i_nlink) {
1532 printk(KERN_DEBUG
1533 "%s: truncating inode %lu to %Ld bytes\n",
1534 __func__, inode->i_ino, inode->i_size);
1535 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1536 inode->i_ino, inode->i_size);
1537 ext3_truncate(inode);
1538 nr_truncates++;
1539 } else {
1540 printk(KERN_DEBUG
1541 "%s: deleting unreferenced inode %lu\n",
1542 __func__, inode->i_ino);
1543 jbd_debug(2, "deleting unreferenced inode %lu\n",
1544 inode->i_ino);
1545 nr_orphans++;
1546 }
1547 iput(inode); /* The delete magic happens here! */
1548 }
1549
1550#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1551
1552 if (nr_orphans)
1553 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1554 PLURAL(nr_orphans));
1555 if (nr_truncates)
1556 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1557 PLURAL(nr_truncates));
1558#ifdef CONFIG_QUOTA
1559 /* Turn quotas off */
1560 for (i = 0; i < MAXQUOTAS; i++) {
1561 if (sb_dqopt(sb)->files[i])
1562 dquot_quota_off(sb, i);
1563 }
1564#endif
1565 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1566}
1567
1568/*
1569 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1570 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1571 * We need to be 1 filesystem block less than the 2^32 sector limit.
1572 */
1573static loff_t ext3_max_size(int bits)
1574{
1575 loff_t res = EXT3_NDIR_BLOCKS;
1576 int meta_blocks;
1577 loff_t upper_limit;
1578
1579 /* This is calculated to be the largest file size for a
1580 * dense, file such that the total number of
1581 * sectors in the file, including data and all indirect blocks,
1582 * does not exceed 2^32 -1
1583 * __u32 i_blocks representing the total number of
1584 * 512 bytes blocks of the file
1585 */
1586 upper_limit = (1LL << 32) - 1;
1587
1588 /* total blocks in file system block size */
1589 upper_limit >>= (bits - 9);
1590
1591
1592 /* indirect blocks */
1593 meta_blocks = 1;
1594 /* double indirect blocks */
1595 meta_blocks += 1 + (1LL << (bits-2));
1596 /* tripple indirect blocks */
1597 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1598
1599 upper_limit -= meta_blocks;
1600 upper_limit <<= bits;
1601
1602 res += 1LL << (bits-2);
1603 res += 1LL << (2*(bits-2));
1604 res += 1LL << (3*(bits-2));
1605 res <<= bits;
1606 if (res > upper_limit)
1607 res = upper_limit;
1608
1609 if (res > MAX_LFS_FILESIZE)
1610 res = MAX_LFS_FILESIZE;
1611
1612 return res;
1613}
1614
1615static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1616 ext3_fsblk_t logic_sb_block,
1617 int nr)
1618{
1619 struct ext3_sb_info *sbi = EXT3_SB(sb);
1620 unsigned long bg, first_meta_bg;
1621 int has_super = 0;
1622
1623 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1624
1625 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1626 nr < first_meta_bg)
1627 return (logic_sb_block + nr + 1);
1628 bg = sbi->s_desc_per_block * nr;
1629 if (ext3_bg_has_super(sb, bg))
1630 has_super = 1;
1631 return (has_super + ext3_group_first_block_no(sb, bg));
1632}
1633
1634
1635static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1636{
1637 struct buffer_head * bh;
1638 struct ext3_super_block *es = NULL;
1639 struct ext3_sb_info *sbi;
1640 ext3_fsblk_t block;
1641 ext3_fsblk_t sb_block = get_sb_block(&data, sb);
1642 ext3_fsblk_t logic_sb_block;
1643 unsigned long offset = 0;
1644 unsigned int journal_inum = 0;
1645 unsigned long journal_devnum = 0;
1646 unsigned long def_mount_opts;
1647 struct inode *root;
1648 int blocksize;
1649 int hblock;
1650 int db_count;
1651 int i;
1652 int needs_recovery;
1653 int ret = -EINVAL;
1654 __le32 features;
1655 int err;
1656
1657 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1658 if (!sbi)
1659 return -ENOMEM;
1660
1661 sbi->s_blockgroup_lock =
1662 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1663 if (!sbi->s_blockgroup_lock) {
1664 kfree(sbi);
1665 return -ENOMEM;
1666 }
1667 sb->s_fs_info = sbi;
1668 sbi->s_mount_opt = 0;
1669 sbi->s_resuid = make_kuid(&init_user_ns, EXT3_DEF_RESUID);
1670 sbi->s_resgid = make_kgid(&init_user_ns, EXT3_DEF_RESGID);
1671 sbi->s_sb_block = sb_block;
1672
1673 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1674 if (!blocksize) {
1675 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1676 goto out_fail;
1677 }
1678
1679 /*
1680 * The ext3 superblock will not be buffer aligned for other than 1kB
1681 * block sizes. We need to calculate the offset from buffer start.
1682 */
1683 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1684 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1685 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1686 } else {
1687 logic_sb_block = sb_block;
1688 }
1689
1690 if (!(bh = sb_bread(sb, logic_sb_block))) {
1691 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1692 goto out_fail;
1693 }
1694 /*
1695 * Note: s_es must be initialized as soon as possible because
1696 * some ext3 macro-instructions depend on its value
1697 */
1698 es = (struct ext3_super_block *) (bh->b_data + offset);
1699 sbi->s_es = es;
1700 sb->s_magic = le16_to_cpu(es->s_magic);
1701 if (sb->s_magic != EXT3_SUPER_MAGIC)
1702 goto cantfind_ext3;
1703
1704 /* Set defaults before we parse the mount options */
1705 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1706 if (def_mount_opts & EXT3_DEFM_DEBUG)
1707 set_opt(sbi->s_mount_opt, DEBUG);
1708 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1709 set_opt(sbi->s_mount_opt, GRPID);
1710 if (def_mount_opts & EXT3_DEFM_UID16)
1711 set_opt(sbi->s_mount_opt, NO_UID32);
1712#ifdef CONFIG_EXT3_FS_XATTR
1713 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1714 set_opt(sbi->s_mount_opt, XATTR_USER);
1715#endif
1716#ifdef CONFIG_EXT3_FS_POSIX_ACL
1717 if (def_mount_opts & EXT3_DEFM_ACL)
1718 set_opt(sbi->s_mount_opt, POSIX_ACL);
1719#endif
1720 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1721 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1722 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1723 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1724 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1725 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1726
1727 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1728 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1729 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1730 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1731 else
1732 set_opt(sbi->s_mount_opt, ERRORS_RO);
1733
1734 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
1735 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
1736
1737 /* enable barriers by default */
1738 set_opt(sbi->s_mount_opt, BARRIER);
1739 set_opt(sbi->s_mount_opt, RESERVATION);
1740
1741 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1742 NULL, 0))
1743 goto failed_mount;
1744
1745 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1746 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1747
1748 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1749 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1750 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1751 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1752 ext3_msg(sb, KERN_WARNING,
1753 "warning: feature flags set on rev 0 fs, "
1754 "running e2fsck is recommended");
1755 /*
1756 * Check feature flags regardless of the revision level, since we
1757 * previously didn't change the revision level when setting the flags,
1758 * so there is a chance incompat flags are set on a rev 0 filesystem.
1759 */
1760 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1761 if (features) {
1762 ext3_msg(sb, KERN_ERR,
1763 "error: couldn't mount because of unsupported "
1764 "optional features (%x)", le32_to_cpu(features));
1765 goto failed_mount;
1766 }
1767 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1768 if (!(sb->s_flags & MS_RDONLY) && features) {
1769 ext3_msg(sb, KERN_ERR,
1770 "error: couldn't mount RDWR because of unsupported "
1771 "optional features (%x)", le32_to_cpu(features));
1772 goto failed_mount;
1773 }
1774 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1775
1776 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1777 blocksize > EXT3_MAX_BLOCK_SIZE) {
1778 ext3_msg(sb, KERN_ERR,
1779 "error: couldn't mount because of unsupported "
1780 "filesystem blocksize %d", blocksize);
1781 goto failed_mount;
1782 }
1783
1784 hblock = bdev_logical_block_size(sb->s_bdev);
1785 if (sb->s_blocksize != blocksize) {
1786 /*
1787 * Make sure the blocksize for the filesystem is larger
1788 * than the hardware sectorsize for the machine.
1789 */
1790 if (blocksize < hblock) {
1791 ext3_msg(sb, KERN_ERR,
1792 "error: fsblocksize %d too small for "
1793 "hardware sectorsize %d", blocksize, hblock);
1794 goto failed_mount;
1795 }
1796
1797 brelse (bh);
1798 if (!sb_set_blocksize(sb, blocksize)) {
1799 ext3_msg(sb, KERN_ERR,
1800 "error: bad blocksize %d", blocksize);
1801 goto out_fail;
1802 }
1803 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1804 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1805 bh = sb_bread(sb, logic_sb_block);
1806 if (!bh) {
1807 ext3_msg(sb, KERN_ERR,
1808 "error: can't read superblock on 2nd try");
1809 goto failed_mount;
1810 }
1811 es = (struct ext3_super_block *)(bh->b_data + offset);
1812 sbi->s_es = es;
1813 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1814 ext3_msg(sb, KERN_ERR,
1815 "error: magic mismatch");
1816 goto failed_mount;
1817 }
1818 }
1819
1820 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1821
1822 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1823 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1824 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1825 } else {
1826 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1827 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1828 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1829 (!is_power_of_2(sbi->s_inode_size)) ||
1830 (sbi->s_inode_size > blocksize)) {
1831 ext3_msg(sb, KERN_ERR,
1832 "error: unsupported inode size: %d",
1833 sbi->s_inode_size);
1834 goto failed_mount;
1835 }
1836 }
1837 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1838 le32_to_cpu(es->s_log_frag_size);
1839 if (blocksize != sbi->s_frag_size) {
1840 ext3_msg(sb, KERN_ERR,
1841 "error: fragsize %lu != blocksize %u (unsupported)",
1842 sbi->s_frag_size, blocksize);
1843 goto failed_mount;
1844 }
1845 sbi->s_frags_per_block = 1;
1846 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1847 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1848 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1849 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1850 goto cantfind_ext3;
1851 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1852 if (sbi->s_inodes_per_block == 0)
1853 goto cantfind_ext3;
1854 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1855 sbi->s_inodes_per_block;
1856 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1857 sbi->s_sbh = bh;
1858 sbi->s_mount_state = le16_to_cpu(es->s_state);
1859 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1860 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1861 for (i=0; i < 4; i++)
1862 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1863 sbi->s_def_hash_version = es->s_def_hash_version;
1864 i = le32_to_cpu(es->s_flags);
1865 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1866 sbi->s_hash_unsigned = 3;
1867 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1868#ifdef __CHAR_UNSIGNED__
1869 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1870 sbi->s_hash_unsigned = 3;
1871#else
1872 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1873#endif
1874 }
1875
1876 if (sbi->s_blocks_per_group > blocksize * 8) {
1877 ext3_msg(sb, KERN_ERR,
1878 "#blocks per group too big: %lu",
1879 sbi->s_blocks_per_group);
1880 goto failed_mount;
1881 }
1882 if (sbi->s_frags_per_group > blocksize * 8) {
1883 ext3_msg(sb, KERN_ERR,
1884 "error: #fragments per group too big: %lu",
1885 sbi->s_frags_per_group);
1886 goto failed_mount;
1887 }
1888 if (sbi->s_inodes_per_group > blocksize * 8) {
1889 ext3_msg(sb, KERN_ERR,
1890 "error: #inodes per group too big: %lu",
1891 sbi->s_inodes_per_group);
1892 goto failed_mount;
1893 }
1894
1895 err = generic_check_addressable(sb->s_blocksize_bits,
1896 le32_to_cpu(es->s_blocks_count));
1897 if (err) {
1898 ext3_msg(sb, KERN_ERR,
1899 "error: filesystem is too large to mount safely");
1900 if (sizeof(sector_t) < 8)
1901 ext3_msg(sb, KERN_ERR,
1902 "error: CONFIG_LBDAF not enabled");
1903 ret = err;
1904 goto failed_mount;
1905 }
1906
1907 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1908 goto cantfind_ext3;
1909 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1910 le32_to_cpu(es->s_first_data_block) - 1)
1911 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1912 db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
1913 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1914 GFP_KERNEL);
1915 if (sbi->s_group_desc == NULL) {
1916 ext3_msg(sb, KERN_ERR,
1917 "error: not enough memory");
1918 ret = -ENOMEM;
1919 goto failed_mount;
1920 }
1921
1922 bgl_lock_init(sbi->s_blockgroup_lock);
1923
1924 for (i = 0; i < db_count; i++) {
1925 block = descriptor_loc(sb, logic_sb_block, i);
1926 sbi->s_group_desc[i] = sb_bread(sb, block);
1927 if (!sbi->s_group_desc[i]) {
1928 ext3_msg(sb, KERN_ERR,
1929 "error: can't read group descriptor %d", i);
1930 db_count = i;
1931 goto failed_mount2;
1932 }
1933 }
1934 if (!ext3_check_descriptors (sb)) {
1935 ext3_msg(sb, KERN_ERR,
1936 "error: group descriptors corrupted");
1937 goto failed_mount2;
1938 }
1939 sbi->s_gdb_count = db_count;
1940 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1941 spin_lock_init(&sbi->s_next_gen_lock);
1942
1943 /* per fileystem reservation list head & lock */
1944 spin_lock_init(&sbi->s_rsv_window_lock);
1945 sbi->s_rsv_window_root = RB_ROOT;
1946 /* Add a single, static dummy reservation to the start of the
1947 * reservation window list --- it gives us a placeholder for
1948 * append-at-start-of-list which makes the allocation logic
1949 * _much_ simpler. */
1950 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1951 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1952 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1953 sbi->s_rsv_window_head.rsv_goal_size = 0;
1954 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1955
1956 /*
1957 * set up enough so that it can read an inode
1958 */
1959 sb->s_op = &ext3_sops;
1960 sb->s_export_op = &ext3_export_ops;
1961 sb->s_xattr = ext3_xattr_handlers;
1962#ifdef CONFIG_QUOTA
1963 sb->s_qcop = &ext3_qctl_operations;
1964 sb->dq_op = &ext3_quota_operations;
1965#endif
1966 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
1967 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1968 mutex_init(&sbi->s_orphan_lock);
1969 mutex_init(&sbi->s_resize_lock);
1970
1971 sb->s_root = NULL;
1972
1973 needs_recovery = (es->s_last_orphan != 0 ||
1974 EXT3_HAS_INCOMPAT_FEATURE(sb,
1975 EXT3_FEATURE_INCOMPAT_RECOVER));
1976
1977 /*
1978 * The first inode we look at is the journal inode. Don't try
1979 * root first: it may be modified in the journal!
1980 */
1981 if (!test_opt(sb, NOLOAD) &&
1982 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1983 if (ext3_load_journal(sb, es, journal_devnum))
1984 goto failed_mount2;
1985 } else if (journal_inum) {
1986 if (ext3_create_journal(sb, es, journal_inum))
1987 goto failed_mount2;
1988 } else {
1989 if (!silent)
1990 ext3_msg(sb, KERN_ERR,
1991 "error: no journal found. "
1992 "mounting ext3 over ext2?");
1993 goto failed_mount2;
1994 }
1995 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1996 ext3_count_free_blocks(sb));
1997 if (!err) {
1998 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1999 ext3_count_free_inodes(sb));
2000 }
2001 if (!err) {
2002 err = percpu_counter_init(&sbi->s_dirs_counter,
2003 ext3_count_dirs(sb));
2004 }
2005 if (err) {
2006 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
2007 ret = err;
2008 goto failed_mount3;
2009 }
2010
2011 /* We have now updated the journal if required, so we can
2012 * validate the data journaling mode. */
2013 switch (test_opt(sb, DATA_FLAGS)) {
2014 case 0:
2015 /* No mode set, assume a default based on the journal
2016 capabilities: ORDERED_DATA if the journal can
2017 cope, else JOURNAL_DATA */
2018 if (journal_check_available_features
2019 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
2020 set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
2021 else
2022 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2023 break;
2024
2025 case EXT3_MOUNT_ORDERED_DATA:
2026 case EXT3_MOUNT_WRITEBACK_DATA:
2027 if (!journal_check_available_features
2028 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
2029 ext3_msg(sb, KERN_ERR,
2030 "error: journal does not support "
2031 "requested data journaling mode");
2032 goto failed_mount3;
2033 }
2034 default:
2035 break;
2036 }
2037
2038 /*
2039 * The journal_load will have done any necessary log recovery,
2040 * so we can safely mount the rest of the filesystem now.
2041 */
2042
2043 root = ext3_iget(sb, EXT3_ROOT_INO);
2044 if (IS_ERR(root)) {
2045 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
2046 ret = PTR_ERR(root);
2047 goto failed_mount3;
2048 }
2049 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2050 iput(root);
2051 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
2052 goto failed_mount3;
2053 }
2054 sb->s_root = d_make_root(root);
2055 if (!sb->s_root) {
2056 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
2057 ret = -ENOMEM;
2058 goto failed_mount3;
2059 }
2060
2061 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
2062
2063 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2064 ext3_orphan_cleanup(sb, es);
2065 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2066 if (needs_recovery) {
2067 ext3_mark_recovery_complete(sb, es);
2068 ext3_msg(sb, KERN_INFO, "recovery complete");
2069 }
2070 ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
2071 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2072 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2073 "writeback");
2074
2075 return 0;
2076
2077cantfind_ext3:
2078 if (!silent)
2079 ext3_msg(sb, KERN_INFO,
2080 "error: can't find ext3 filesystem on dev %s.",
2081 sb->s_id);
2082 goto failed_mount;
2083
2084failed_mount3:
2085 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2086 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2087 percpu_counter_destroy(&sbi->s_dirs_counter);
2088 journal_destroy(sbi->s_journal);
2089failed_mount2:
2090 for (i = 0; i < db_count; i++)
2091 brelse(sbi->s_group_desc[i]);
2092 kfree(sbi->s_group_desc);
2093failed_mount:
2094#ifdef CONFIG_QUOTA
2095 for (i = 0; i < MAXQUOTAS; i++)
2096 kfree(sbi->s_qf_names[i]);
2097#endif
2098 ext3_blkdev_remove(sbi);
2099 brelse(bh);
2100out_fail:
2101 sb->s_fs_info = NULL;
2102 kfree(sbi->s_blockgroup_lock);
2103 kfree(sbi);
2104 return ret;
2105}
2106
2107/*
2108 * Setup any per-fs journal parameters now. We'll do this both on
2109 * initial mount, once the journal has been initialised but before we've
2110 * done any recovery; and again on any subsequent remount.
2111 */
2112static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2113{
2114 struct ext3_sb_info *sbi = EXT3_SB(sb);
2115
2116 if (sbi->s_commit_interval)
2117 journal->j_commit_interval = sbi->s_commit_interval;
2118 /* We could also set up an ext3-specific default for the commit
2119 * interval here, but for now we'll just fall back to the jbd
2120 * default. */
2121
2122 spin_lock(&journal->j_state_lock);
2123 if (test_opt(sb, BARRIER))
2124 journal->j_flags |= JFS_BARRIER;
2125 else
2126 journal->j_flags &= ~JFS_BARRIER;
2127 if (test_opt(sb, DATA_ERR_ABORT))
2128 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2129 else
2130 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2131 spin_unlock(&journal->j_state_lock);
2132}
2133
2134static journal_t *ext3_get_journal(struct super_block *sb,
2135 unsigned int journal_inum)
2136{
2137 struct inode *journal_inode;
2138 journal_t *journal;
2139
2140 /* First, test for the existence of a valid inode on disk. Bad
2141 * things happen if we iget() an unused inode, as the subsequent
2142 * iput() will try to delete it. */
2143
2144 journal_inode = ext3_iget(sb, journal_inum);
2145 if (IS_ERR(journal_inode)) {
2146 ext3_msg(sb, KERN_ERR, "error: no journal found");
2147 return NULL;
2148 }
2149 if (!journal_inode->i_nlink) {
2150 make_bad_inode(journal_inode);
2151 iput(journal_inode);
2152 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
2153 return NULL;
2154 }
2155
2156 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2157 journal_inode, journal_inode->i_size);
2158 if (!S_ISREG(journal_inode->i_mode)) {
2159 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
2160 iput(journal_inode);
2161 return NULL;
2162 }
2163
2164 journal = journal_init_inode(journal_inode);
2165 if (!journal) {
2166 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
2167 iput(journal_inode);
2168 return NULL;
2169 }
2170 journal->j_private = sb;
2171 ext3_init_journal_params(sb, journal);
2172 return journal;
2173}
2174
2175static journal_t *ext3_get_dev_journal(struct super_block *sb,
2176 dev_t j_dev)
2177{
2178 struct buffer_head * bh;
2179 journal_t *journal;
2180 ext3_fsblk_t start;
2181 ext3_fsblk_t len;
2182 int hblock, blocksize;
2183 ext3_fsblk_t sb_block;
2184 unsigned long offset;
2185 struct ext3_super_block * es;
2186 struct block_device *bdev;
2187
2188 bdev = ext3_blkdev_get(j_dev, sb);
2189 if (bdev == NULL)
2190 return NULL;
2191
2192 blocksize = sb->s_blocksize;
2193 hblock = bdev_logical_block_size(bdev);
2194 if (blocksize < hblock) {
2195 ext3_msg(sb, KERN_ERR,
2196 "error: blocksize too small for journal device");
2197 goto out_bdev;
2198 }
2199
2200 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2201 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2202 set_blocksize(bdev, blocksize);
2203 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2204 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2205 "external journal");
2206 goto out_bdev;
2207 }
2208
2209 es = (struct ext3_super_block *) (bh->b_data + offset);
2210 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2211 !(le32_to_cpu(es->s_feature_incompat) &
2212 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2213 ext3_msg(sb, KERN_ERR, "error: external journal has "
2214 "bad superblock");
2215 brelse(bh);
2216 goto out_bdev;
2217 }
2218
2219 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2220 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
2221 brelse(bh);
2222 goto out_bdev;
2223 }
2224
2225 len = le32_to_cpu(es->s_blocks_count);
2226 start = sb_block + 1;
2227 brelse(bh); /* we're done with the superblock */
2228
2229 journal = journal_init_dev(bdev, sb->s_bdev,
2230 start, len, blocksize);
2231 if (!journal) {
2232 ext3_msg(sb, KERN_ERR,
2233 "error: failed to create device journal");
2234 goto out_bdev;
2235 }
2236 journal->j_private = sb;
2237 if (!bh_uptodate_or_lock(journal->j_sb_buffer)) {
2238 if (bh_submit_read(journal->j_sb_buffer)) {
2239 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2240 goto out_journal;
2241 }
2242 }
2243 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2244 ext3_msg(sb, KERN_ERR,
2245 "error: external journal has more than one "
2246 "user (unsupported) - %d",
2247 be32_to_cpu(journal->j_superblock->s_nr_users));
2248 goto out_journal;
2249 }
2250 EXT3_SB(sb)->journal_bdev = bdev;
2251 ext3_init_journal_params(sb, journal);
2252 return journal;
2253out_journal:
2254 journal_destroy(journal);
2255out_bdev:
2256 ext3_blkdev_put(bdev);
2257 return NULL;
2258}
2259
2260static int ext3_load_journal(struct super_block *sb,
2261 struct ext3_super_block *es,
2262 unsigned long journal_devnum)
2263{
2264 journal_t *journal;
2265 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2266 dev_t journal_dev;
2267 int err = 0;
2268 int really_read_only;
2269
2270 if (journal_devnum &&
2271 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2272 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2273 "numbers have changed");
2274 journal_dev = new_decode_dev(journal_devnum);
2275 } else
2276 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2277
2278 really_read_only = bdev_read_only(sb->s_bdev);
2279
2280 /*
2281 * Are we loading a blank journal or performing recovery after a
2282 * crash? For recovery, we need to check in advance whether we
2283 * can get read-write access to the device.
2284 */
2285
2286 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2287 if (sb->s_flags & MS_RDONLY) {
2288 ext3_msg(sb, KERN_INFO,
2289 "recovery required on readonly filesystem");
2290 if (really_read_only) {
2291 ext3_msg(sb, KERN_ERR, "error: write access "
2292 "unavailable, cannot proceed");
2293 return -EROFS;
2294 }
2295 ext3_msg(sb, KERN_INFO,
2296 "write access will be enabled during recovery");
2297 }
2298 }
2299
2300 if (journal_inum && journal_dev) {
2301 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2302 "and inode journals");
2303 return -EINVAL;
2304 }
2305
2306 if (journal_inum) {
2307 if (!(journal = ext3_get_journal(sb, journal_inum)))
2308 return -EINVAL;
2309 } else {
2310 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2311 return -EINVAL;
2312 }
2313
2314 if (!(journal->j_flags & JFS_BARRIER))
2315 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2316
2317 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2318 err = journal_update_format(journal);
2319 if (err) {
2320 ext3_msg(sb, KERN_ERR, "error updating journal");
2321 journal_destroy(journal);
2322 return err;
2323 }
2324 }
2325
2326 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2327 err = journal_wipe(journal, !really_read_only);
2328 if (!err)
2329 err = journal_load(journal);
2330
2331 if (err) {
2332 ext3_msg(sb, KERN_ERR, "error loading journal");
2333 journal_destroy(journal);
2334 return err;
2335 }
2336
2337 EXT3_SB(sb)->s_journal = journal;
2338 ext3_clear_journal_err(sb, es);
2339
2340 if (!really_read_only && journal_devnum &&
2341 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2342 es->s_journal_dev = cpu_to_le32(journal_devnum);
2343
2344 /* Make sure we flush the recovery flag to disk. */
2345 ext3_commit_super(sb, es, 1);
2346 }
2347
2348 return 0;
2349}
2350
2351static int ext3_create_journal(struct super_block *sb,
2352 struct ext3_super_block *es,
2353 unsigned int journal_inum)
2354{
2355 journal_t *journal;
2356 int err;
2357
2358 if (sb->s_flags & MS_RDONLY) {
2359 ext3_msg(sb, KERN_ERR,
2360 "error: readonly filesystem when trying to "
2361 "create journal");
2362 return -EROFS;
2363 }
2364
2365 journal = ext3_get_journal(sb, journal_inum);
2366 if (!journal)
2367 return -EINVAL;
2368
2369 ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
2370 journal_inum);
2371
2372 err = journal_create(journal);
2373 if (err) {
2374 ext3_msg(sb, KERN_ERR, "error creating journal");
2375 journal_destroy(journal);
2376 return -EIO;
2377 }
2378
2379 EXT3_SB(sb)->s_journal = journal;
2380
2381 ext3_update_dynamic_rev(sb);
2382 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2383 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2384
2385 es->s_journal_inum = cpu_to_le32(journal_inum);
2386
2387 /* Make sure we flush the recovery flag to disk. */
2388 ext3_commit_super(sb, es, 1);
2389
2390 return 0;
2391}
2392
2393static int ext3_commit_super(struct super_block *sb,
2394 struct ext3_super_block *es,
2395 int sync)
2396{
2397 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2398 int error = 0;
2399
2400 if (!sbh)
2401 return error;
2402
2403 if (buffer_write_io_error(sbh)) {
2404 /*
2405 * Oh, dear. A previous attempt to write the
2406 * superblock failed. This could happen because the
2407 * USB device was yanked out. Or it could happen to
2408 * be a transient write error and maybe the block will
2409 * be remapped. Nothing we can do but to retry the
2410 * write and hope for the best.
2411 */
2412 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2413 "superblock detected");
2414 clear_buffer_write_io_error(sbh);
2415 set_buffer_uptodate(sbh);
2416 }
2417 /*
2418 * If the file system is mounted read-only, don't update the
2419 * superblock write time. This avoids updating the superblock
2420 * write time when we are mounting the root file system
2421 * read/only but we need to replay the journal; at that point,
2422 * for people who are east of GMT and who make their clock
2423 * tick in localtime for Windows bug-for-bug compatibility,
2424 * the clock is set in the future, and this will cause e2fsck
2425 * to complain and force a full file system check.
2426 */
2427 if (!(sb->s_flags & MS_RDONLY))
2428 es->s_wtime = cpu_to_le32(get_seconds());
2429 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2430 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2431 BUFFER_TRACE(sbh, "marking dirty");
2432 mark_buffer_dirty(sbh);
2433 if (sync) {
2434 error = sync_dirty_buffer(sbh);
2435 if (buffer_write_io_error(sbh)) {
2436 ext3_msg(sb, KERN_ERR, "I/O error while writing "
2437 "superblock");
2438 clear_buffer_write_io_error(sbh);
2439 set_buffer_uptodate(sbh);
2440 }
2441 }
2442 return error;
2443}
2444
2445
2446/*
2447 * Have we just finished recovery? If so, and if we are mounting (or
2448 * remounting) the filesystem readonly, then we will end up with a
2449 * consistent fs on disk. Record that fact.
2450 */
2451static void ext3_mark_recovery_complete(struct super_block * sb,
2452 struct ext3_super_block * es)
2453{
2454 journal_t *journal = EXT3_SB(sb)->s_journal;
2455
2456 journal_lock_updates(journal);
2457 if (journal_flush(journal) < 0)
2458 goto out;
2459
2460 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2461 sb->s_flags & MS_RDONLY) {
2462 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2463 ext3_commit_super(sb, es, 1);
2464 }
2465
2466out:
2467 journal_unlock_updates(journal);
2468}
2469
2470/*
2471 * If we are mounting (or read-write remounting) a filesystem whose journal
2472 * has recorded an error from a previous lifetime, move that error to the
2473 * main filesystem now.
2474 */
2475static void ext3_clear_journal_err(struct super_block *sb,
2476 struct ext3_super_block *es)
2477{
2478 journal_t *journal;
2479 int j_errno;
2480 const char *errstr;
2481
2482 journal = EXT3_SB(sb)->s_journal;
2483
2484 /*
2485 * Now check for any error status which may have been recorded in the
2486 * journal by a prior ext3_error() or ext3_abort()
2487 */
2488
2489 j_errno = journal_errno(journal);
2490 if (j_errno) {
2491 char nbuf[16];
2492
2493 errstr = ext3_decode_error(sb, j_errno, nbuf);
2494 ext3_warning(sb, __func__, "Filesystem error recorded "
2495 "from previous mount: %s", errstr);
2496 ext3_warning(sb, __func__, "Marking fs in need of "
2497 "filesystem check.");
2498
2499 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2500 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2501 ext3_commit_super (sb, es, 1);
2502
2503 journal_clear_err(journal);
2504 }
2505}
2506
2507/*
2508 * Force the running and committing transactions to commit,
2509 * and wait on the commit.
2510 */
2511int ext3_force_commit(struct super_block *sb)
2512{
2513 journal_t *journal;
2514 int ret;
2515
2516 if (sb->s_flags & MS_RDONLY)
2517 return 0;
2518
2519 journal = EXT3_SB(sb)->s_journal;
2520 ret = ext3_journal_force_commit(journal);
2521 return ret;
2522}
2523
2524static int ext3_sync_fs(struct super_block *sb, int wait)
2525{
2526 tid_t target;
2527
2528 trace_ext3_sync_fs(sb, wait);
2529 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2530 if (wait)
2531 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2532 }
2533 return 0;
2534}
2535
2536/*
2537 * LVM calls this function before a (read-only) snapshot is created. This
2538 * gives us a chance to flush the journal completely and mark the fs clean.
2539 */
2540static int ext3_freeze(struct super_block *sb)
2541{
2542 int error = 0;
2543 journal_t *journal;
2544
2545 if (!(sb->s_flags & MS_RDONLY)) {
2546 journal = EXT3_SB(sb)->s_journal;
2547
2548 /* Now we set up the journal barrier. */
2549 journal_lock_updates(journal);
2550
2551 /*
2552 * We don't want to clear needs_recovery flag when we failed
2553 * to flush the journal.
2554 */
2555 error = journal_flush(journal);
2556 if (error < 0)
2557 goto out;
2558
2559 /* Journal blocked and flushed, clear needs_recovery flag. */
2560 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2561 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2562 if (error)
2563 goto out;
2564 }
2565 return 0;
2566
2567out:
2568 journal_unlock_updates(journal);
2569 return error;
2570}
2571
2572/*
2573 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2574 * flag here, even though the filesystem is not technically dirty yet.
2575 */
2576static int ext3_unfreeze(struct super_block *sb)
2577{
2578 if (!(sb->s_flags & MS_RDONLY)) {
2579 lock_super(sb);
2580 /* Reser the needs_recovery flag before the fs is unlocked. */
2581 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2582 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2583 unlock_super(sb);
2584 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2585 }
2586 return 0;
2587}
2588
2589static int ext3_remount (struct super_block * sb, int * flags, char * data)
2590{
2591 struct ext3_super_block * es;
2592 struct ext3_sb_info *sbi = EXT3_SB(sb);
2593 ext3_fsblk_t n_blocks_count = 0;
2594 unsigned long old_sb_flags;
2595 struct ext3_mount_options old_opts;
2596 int enable_quota = 0;
2597 int err;
2598#ifdef CONFIG_QUOTA
2599 int i;
2600#endif
2601
2602 /* Store the original options */
2603 lock_super(sb);
2604 old_sb_flags = sb->s_flags;
2605 old_opts.s_mount_opt = sbi->s_mount_opt;
2606 old_opts.s_resuid = sbi->s_resuid;
2607 old_opts.s_resgid = sbi->s_resgid;
2608 old_opts.s_commit_interval = sbi->s_commit_interval;
2609#ifdef CONFIG_QUOTA
2610 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2611 for (i = 0; i < MAXQUOTAS; i++)
2612 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2613#endif
2614
2615 /*
2616 * Allow the "check" option to be passed as a remount option.
2617 */
2618 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2619 err = -EINVAL;
2620 goto restore_opts;
2621 }
2622
2623 if (test_opt(sb, ABORT))
2624 ext3_abort(sb, __func__, "Abort forced by user");
2625
2626 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2627 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2628
2629 es = sbi->s_es;
2630
2631 ext3_init_journal_params(sb, sbi->s_journal);
2632
2633 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2634 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2635 if (test_opt(sb, ABORT)) {
2636 err = -EROFS;
2637 goto restore_opts;
2638 }
2639
2640 if (*flags & MS_RDONLY) {
2641 err = dquot_suspend(sb, -1);
2642 if (err < 0)
2643 goto restore_opts;
2644
2645 /*
2646 * First of all, the unconditional stuff we have to do
2647 * to disable replay of the journal when we next remount
2648 */
2649 sb->s_flags |= MS_RDONLY;
2650
2651 /*
2652 * OK, test if we are remounting a valid rw partition
2653 * readonly, and if so set the rdonly flag and then
2654 * mark the partition as valid again.
2655 */
2656 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2657 (sbi->s_mount_state & EXT3_VALID_FS))
2658 es->s_state = cpu_to_le16(sbi->s_mount_state);
2659
2660 ext3_mark_recovery_complete(sb, es);
2661 } else {
2662 __le32 ret;
2663 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2664 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2665 ext3_msg(sb, KERN_WARNING,
2666 "warning: couldn't remount RDWR "
2667 "because of unsupported optional "
2668 "features (%x)", le32_to_cpu(ret));
2669 err = -EROFS;
2670 goto restore_opts;
2671 }
2672
2673 /*
2674 * If we have an unprocessed orphan list hanging
2675 * around from a previously readonly bdev mount,
2676 * require a full umount & mount for now.
2677 */
2678 if (es->s_last_orphan) {
2679 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
2680 "remount RDWR because of unprocessed "
2681 "orphan inode list. Please "
2682 "umount & mount instead.");
2683 err = -EINVAL;
2684 goto restore_opts;
2685 }
2686
2687 /*
2688 * Mounting a RDONLY partition read-write, so reread
2689 * and store the current valid flag. (It may have
2690 * been changed by e2fsck since we originally mounted
2691 * the partition.)
2692 */
2693 ext3_clear_journal_err(sb, es);
2694 sbi->s_mount_state = le16_to_cpu(es->s_state);
2695 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2696 goto restore_opts;
2697 if (!ext3_setup_super (sb, es, 0))
2698 sb->s_flags &= ~MS_RDONLY;
2699 enable_quota = 1;
2700 }
2701 }
2702#ifdef CONFIG_QUOTA
2703 /* Release old quota file names */
2704 for (i = 0; i < MAXQUOTAS; i++)
2705 if (old_opts.s_qf_names[i] &&
2706 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2707 kfree(old_opts.s_qf_names[i]);
2708#endif
2709 unlock_super(sb);
2710
2711 if (enable_quota)
2712 dquot_resume(sb, -1);
2713 return 0;
2714restore_opts:
2715 sb->s_flags = old_sb_flags;
2716 sbi->s_mount_opt = old_opts.s_mount_opt;
2717 sbi->s_resuid = old_opts.s_resuid;
2718 sbi->s_resgid = old_opts.s_resgid;
2719 sbi->s_commit_interval = old_opts.s_commit_interval;
2720#ifdef CONFIG_QUOTA
2721 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2722 for (i = 0; i < MAXQUOTAS; i++) {
2723 if (sbi->s_qf_names[i] &&
2724 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2725 kfree(sbi->s_qf_names[i]);
2726 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2727 }
2728#endif
2729 unlock_super(sb);
2730 return err;
2731}
2732
2733static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2734{
2735 struct super_block *sb = dentry->d_sb;
2736 struct ext3_sb_info *sbi = EXT3_SB(sb);
2737 struct ext3_super_block *es = sbi->s_es;
2738 u64 fsid;
2739
2740 if (test_opt(sb, MINIX_DF)) {
2741 sbi->s_overhead_last = 0;
2742 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2743 unsigned long ngroups = sbi->s_groups_count, i;
2744 ext3_fsblk_t overhead = 0;
2745 smp_rmb();
2746
2747 /*
2748 * Compute the overhead (FS structures). This is constant
2749 * for a given filesystem unless the number of block groups
2750 * changes so we cache the previous value until it does.
2751 */
2752
2753 /*
2754 * All of the blocks before first_data_block are
2755 * overhead
2756 */
2757 overhead = le32_to_cpu(es->s_first_data_block);
2758
2759 /*
2760 * Add the overhead attributed to the superblock and
2761 * block group descriptors. If the sparse superblocks
2762 * feature is turned on, then not all groups have this.
2763 */
2764 for (i = 0; i < ngroups; i++) {
2765 overhead += ext3_bg_has_super(sb, i) +
2766 ext3_bg_num_gdb(sb, i);
2767 cond_resched();
2768 }
2769
2770 /*
2771 * Every block group has an inode bitmap, a block
2772 * bitmap, and an inode table.
2773 */
2774 overhead += ngroups * (2 + sbi->s_itb_per_group);
2775 sbi->s_overhead_last = overhead;
2776 smp_wmb();
2777 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2778 }
2779
2780 buf->f_type = EXT3_SUPER_MAGIC;
2781 buf->f_bsize = sb->s_blocksize;
2782 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2783 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2784 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2785 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2786 buf->f_bavail = 0;
2787 buf->f_files = le32_to_cpu(es->s_inodes_count);
2788 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2789 buf->f_namelen = EXT3_NAME_LEN;
2790 fsid = le64_to_cpup((void *)es->s_uuid) ^
2791 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2792 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2793 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2794 return 0;
2795}
2796
2797/* Helper function for writing quotas on sync - we need to start transaction before quota file
2798 * is locked for write. Otherwise the are possible deadlocks:
2799 * Process 1 Process 2
2800 * ext3_create() quota_sync()
2801 * journal_start() write_dquot()
2802 * dquot_initialize() down(dqio_mutex)
2803 * down(dqio_mutex) journal_start()
2804 *
2805 */
2806
2807#ifdef CONFIG_QUOTA
2808
2809static inline struct inode *dquot_to_inode(struct dquot *dquot)
2810{
2811 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2812}
2813
2814static int ext3_write_dquot(struct dquot *dquot)
2815{
2816 int ret, err;
2817 handle_t *handle;
2818 struct inode *inode;
2819
2820 inode = dquot_to_inode(dquot);
2821 handle = ext3_journal_start(inode,
2822 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2823 if (IS_ERR(handle))
2824 return PTR_ERR(handle);
2825 ret = dquot_commit(dquot);
2826 err = ext3_journal_stop(handle);
2827 if (!ret)
2828 ret = err;
2829 return ret;
2830}
2831
2832static int ext3_acquire_dquot(struct dquot *dquot)
2833{
2834 int ret, err;
2835 handle_t *handle;
2836
2837 handle = ext3_journal_start(dquot_to_inode(dquot),
2838 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2839 if (IS_ERR(handle))
2840 return PTR_ERR(handle);
2841 ret = dquot_acquire(dquot);
2842 err = ext3_journal_stop(handle);
2843 if (!ret)
2844 ret = err;
2845 return ret;
2846}
2847
2848static int ext3_release_dquot(struct dquot *dquot)
2849{
2850 int ret, err;
2851 handle_t *handle;
2852
2853 handle = ext3_journal_start(dquot_to_inode(dquot),
2854 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2855 if (IS_ERR(handle)) {
2856 /* Release dquot anyway to avoid endless cycle in dqput() */
2857 dquot_release(dquot);
2858 return PTR_ERR(handle);
2859 }
2860 ret = dquot_release(dquot);
2861 err = ext3_journal_stop(handle);
2862 if (!ret)
2863 ret = err;
2864 return ret;
2865}
2866
2867static int ext3_mark_dquot_dirty(struct dquot *dquot)
2868{
2869 /* Are we journaling quotas? */
2870 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2871 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2872 dquot_mark_dquot_dirty(dquot);
2873 return ext3_write_dquot(dquot);
2874 } else {
2875 return dquot_mark_dquot_dirty(dquot);
2876 }
2877}
2878
2879static int ext3_write_info(struct super_block *sb, int type)
2880{
2881 int ret, err;
2882 handle_t *handle;
2883
2884 /* Data block + inode block */
2885 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2886 if (IS_ERR(handle))
2887 return PTR_ERR(handle);
2888 ret = dquot_commit_info(sb, type);
2889 err = ext3_journal_stop(handle);
2890 if (!ret)
2891 ret = err;
2892 return ret;
2893}
2894
2895/*
2896 * Turn on quotas during mount time - we need to find
2897 * the quota file and such...
2898 */
2899static int ext3_quota_on_mount(struct super_block *sb, int type)
2900{
2901 return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2902 EXT3_SB(sb)->s_jquota_fmt, type);
2903}
2904
2905/*
2906 * Standard function to be called on quota_on
2907 */
2908static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2909 struct path *path)
2910{
2911 int err;
2912
2913 if (!test_opt(sb, QUOTA))
2914 return -EINVAL;
2915
2916 /* Quotafile not on the same filesystem? */
2917 if (path->dentry->d_sb != sb)
2918 return -EXDEV;
2919 /* Journaling quota? */
2920 if (EXT3_SB(sb)->s_qf_names[type]) {
2921 /* Quotafile not of fs root? */
2922 if (path->dentry->d_parent != sb->s_root)
2923 ext3_msg(sb, KERN_WARNING,
2924 "warning: Quota file not on filesystem root. "
2925 "Journaled quota will not work.");
2926 }
2927
2928 /*
2929 * When we journal data on quota file, we have to flush journal to see
2930 * all updates to the file when we bypass pagecache...
2931 */
2932 if (ext3_should_journal_data(path->dentry->d_inode)) {
2933 /*
2934 * We don't need to lock updates but journal_flush() could
2935 * otherwise be livelocked...
2936 */
2937 journal_lock_updates(EXT3_SB(sb)->s_journal);
2938 err = journal_flush(EXT3_SB(sb)->s_journal);
2939 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2940 if (err)
2941 return err;
2942 }
2943
2944 return dquot_quota_on(sb, type, format_id, path);
2945}
2946
2947/* Read data from quotafile - avoid pagecache and such because we cannot afford
2948 * acquiring the locks... As quota files are never truncated and quota code
2949 * itself serializes the operations (and no one else should touch the files)
2950 * we don't have to be afraid of races */
2951static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2952 size_t len, loff_t off)
2953{
2954 struct inode *inode = sb_dqopt(sb)->files[type];
2955 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2956 int err = 0;
2957 int offset = off & (sb->s_blocksize - 1);
2958 int tocopy;
2959 size_t toread;
2960 struct buffer_head *bh;
2961 loff_t i_size = i_size_read(inode);
2962
2963 if (off > i_size)
2964 return 0;
2965 if (off+len > i_size)
2966 len = i_size-off;
2967 toread = len;
2968 while (toread > 0) {
2969 tocopy = sb->s_blocksize - offset < toread ?
2970 sb->s_blocksize - offset : toread;
2971 bh = ext3_bread(NULL, inode, blk, 0, &err);
2972 if (err)
2973 return err;
2974 if (!bh) /* A hole? */
2975 memset(data, 0, tocopy);
2976 else
2977 memcpy(data, bh->b_data+offset, tocopy);
2978 brelse(bh);
2979 offset = 0;
2980 toread -= tocopy;
2981 data += tocopy;
2982 blk++;
2983 }
2984 return len;
2985}
2986
2987/* Write to quotafile (we know the transaction is already started and has
2988 * enough credits) */
2989static ssize_t ext3_quota_write(struct super_block *sb, int type,
2990 const char *data, size_t len, loff_t off)
2991{
2992 struct inode *inode = sb_dqopt(sb)->files[type];
2993 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2994 int err = 0;
2995 int offset = off & (sb->s_blocksize - 1);
2996 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2997 struct buffer_head *bh;
2998 handle_t *handle = journal_current_handle();
2999
3000 if (!handle) {
3001 ext3_msg(sb, KERN_WARNING,
3002 "warning: quota write (off=%llu, len=%llu)"
3003 " cancelled because transaction is not started.",
3004 (unsigned long long)off, (unsigned long long)len);
3005 return -EIO;
3006 }
3007
3008 /*
3009 * Since we account only one data block in transaction credits,
3010 * then it is impossible to cross a block boundary.
3011 */
3012 if (sb->s_blocksize - offset < len) {
3013 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3014 " cancelled because not block aligned",
3015 (unsigned long long)off, (unsigned long long)len);
3016 return -EIO;
3017 }
3018 bh = ext3_bread(handle, inode, blk, 1, &err);
3019 if (!bh)
3020 goto out;
3021 if (journal_quota) {
3022 err = ext3_journal_get_write_access(handle, bh);
3023 if (err) {
3024 brelse(bh);
3025 goto out;
3026 }
3027 }
3028 lock_buffer(bh);
3029 memcpy(bh->b_data+offset, data, len);
3030 flush_dcache_page(bh->b_page);
3031 unlock_buffer(bh);
3032 if (journal_quota)
3033 err = ext3_journal_dirty_metadata(handle, bh);
3034 else {
3035 /* Always do at least ordered writes for quotas */
3036 err = ext3_journal_dirty_data(handle, bh);
3037 mark_buffer_dirty(bh);
3038 }
3039 brelse(bh);
3040out:
3041 if (err)
3042 return err;
3043 if (inode->i_size < off + len) {
3044 i_size_write(inode, off + len);
3045 EXT3_I(inode)->i_disksize = inode->i_size;
3046 }
3047 inode->i_version++;
3048 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3049 ext3_mark_inode_dirty(handle, inode);
3050 return len;
3051}
3052
3053#endif
3054
3055static struct dentry *ext3_mount(struct file_system_type *fs_type,
3056 int flags, const char *dev_name, void *data)
3057{
3058 return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
3059}
3060
3061static struct file_system_type ext3_fs_type = {
3062 .owner = THIS_MODULE,
3063 .name = "ext3",
3064 .mount = ext3_mount,
3065 .kill_sb = kill_block_super,
3066 .fs_flags = FS_REQUIRES_DEV,
3067};
3068
3069static int __init init_ext3_fs(void)
3070{
3071 int err = init_ext3_xattr();
3072 if (err)
3073 return err;
3074 err = init_inodecache();
3075 if (err)
3076 goto out1;
3077 err = register_filesystem(&ext3_fs_type);
3078 if (err)
3079 goto out;
3080 return 0;
3081out:
3082 destroy_inodecache();
3083out1:
3084 exit_ext3_xattr();
3085 return err;
3086}
3087
3088static void __exit exit_ext3_fs(void)
3089{
3090 unregister_filesystem(&ext3_fs_type);
3091 destroy_inodecache();
3092 exit_ext3_xattr();
3093}
3094
3095MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3096MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3097MODULE_LICENSE("GPL");
3098module_init(init_ext3_fs)
3099module_exit(exit_ext3_fs)