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