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Linux 3.4.102
[linux/fpc-iii.git] / fs / ext3 / super.c
blobef4c812c7a6393dd39e2b9ad6206030301e90420
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 * The only special thing we need to do here is to make sure that all
69 * journal_end calls result in the superblock being marked dirty, so
70 * that sync() will call the filesystem's write_super callback if
71 * appropriate.
72 */
73 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
74 {
75 journal_t *journal;
76
77 if (sb->s_flags & MS_RDONLY)
78 return ERR_PTR(-EROFS);
79
80 /* Special case here: if the journal has aborted behind our
81 * backs (eg. EIO in the commit thread), then we still need to
82 * take the FS itself readonly cleanly. */
83 journal = EXT3_SB(sb)->s_journal;
84 if (is_journal_aborted(journal)) {
85 ext3_abort(sb, __func__,
86 "Detected aborted journal");
87 return ERR_PTR(-EROFS);
88 }
89
90 return journal_start(journal, nblocks);
91 }
92
93 /*
94 * The only special thing we need to do here is to make sure that all
95 * journal_stop calls result in the superblock being marked dirty, so
96 * that sync() will call the filesystem's write_super callback if
97 * appropriate.
98 */
99 int __ext3_journal_stop(const char *where, handle_t *handle)
100 {
101 struct super_block *sb;
102 int err;
103 int rc;
104
105 sb = handle->h_transaction->t_journal->j_private;
106 err = handle->h_err;
107 rc = journal_stop(handle);
108
109 if (!err)
110 err = rc;
111 if (err)
112 __ext3_std_error(sb, where, err);
113 return err;
114 }
115
116 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
117 struct buffer_head *bh, handle_t *handle, int err)
118 {
119 char nbuf[16];
120 const char *errstr = ext3_decode_error(NULL, err, nbuf);
121
122 if (bh)
123 BUFFER_TRACE(bh, "abort");
124
125 if (!handle->h_err)
126 handle->h_err = err;
127
128 if (is_handle_aborted(handle))
129 return;
130
131 printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
132 caller, errstr, err_fn);
133
134 journal_abort_handle(handle);
135 }
136
137 void ext3_msg(struct super_block *sb, const char *prefix,
138 const char *fmt, ...)
139 {
140 struct va_format vaf;
141 va_list args;
142
143 va_start(args, fmt);
144
145 vaf.fmt = fmt;
146 vaf.va = &args;
147
148 printk("%sEXT3-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
149
150 va_end(args);
151 }
152
153 /* Deal with the reporting of failure conditions on a filesystem such as
154 * inconsistencies detected or read IO failures.
155 *
156 * On ext2, we can store the error state of the filesystem in the
157 * superblock. That is not possible on ext3, because we may have other
158 * write ordering constraints on the superblock which prevent us from
159 * writing it out straight away; and given that the journal is about to
160 * be aborted, we can't rely on the current, or future, transactions to
161 * write out the superblock safely.
162 *
163 * We'll just use the journal_abort() error code to record an error in
164 * the journal instead. On recovery, the journal will complain about
165 * that error until we've noted it down and cleared it.
166 */
167
168 static void ext3_handle_error(struct super_block *sb)
169 {
170 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
171
172 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
173 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
174
175 if (sb->s_flags & MS_RDONLY)
176 return;
177
178 if (!test_opt (sb, ERRORS_CONT)) {
179 journal_t *journal = EXT3_SB(sb)->s_journal;
180
181 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
182 if (journal)
183 journal_abort(journal, -EIO);
184 }
185 if (test_opt (sb, ERRORS_RO)) {
186 ext3_msg(sb, KERN_CRIT,
187 "error: remounting filesystem read-only");
188 sb->s_flags |= MS_RDONLY;
189 }
190 ext3_commit_super(sb, es, 1);
191 if (test_opt(sb, ERRORS_PANIC))
192 panic("EXT3-fs (%s): panic forced after error\n",
193 sb->s_id);
194 }
195
196 void ext3_error(struct super_block *sb, const char *function,
197 const char *fmt, ...)
198 {
199 struct va_format vaf;
200 va_list args;
201
202 va_start(args, fmt);
203
204 vaf.fmt = fmt;
205 vaf.va = &args;
206
207 printk(KERN_CRIT "EXT3-fs error (device %s): %s: %pV\n",
208 sb->s_id, function, &vaf);
209
210 va_end(args);
211
212 ext3_handle_error(sb);
213 }
214
215 static const char *ext3_decode_error(struct super_block * sb, int errno,
216 char nbuf[16])
217 {
218 char *errstr = NULL;
219
220 switch (errno) {
221 case -EIO:
222 errstr = "IO failure";
223 break;
224 case -ENOMEM:
225 errstr = "Out of memory";
226 break;
227 case -EROFS:
228 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
229 errstr = "Journal has aborted";
230 else
231 errstr = "Readonly filesystem";
232 break;
233 default:
234 /* If the caller passed in an extra buffer for unknown
235 * errors, textualise them now. Else we just return
236 * NULL. */
237 if (nbuf) {
238 /* Check for truncated error codes... */
239 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
240 errstr = nbuf;
241 }
242 break;
243 }
244
245 return errstr;
246 }
247
248 /* __ext3_std_error decodes expected errors from journaling functions
249 * automatically and invokes the appropriate error response. */
250
251 void __ext3_std_error (struct super_block * sb, const char * function,
252 int errno)
253 {
254 char nbuf[16];
255 const char *errstr;
256
257 /* Special case: if the error is EROFS, and we're not already
258 * inside a transaction, then there's really no point in logging
259 * an error. */
260 if (errno == -EROFS && journal_current_handle() == NULL &&
261 (sb->s_flags & MS_RDONLY))
262 return;
263
264 errstr = ext3_decode_error(sb, errno, nbuf);
265 ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
266
267 ext3_handle_error(sb);
268 }
269
270 /*
271 * ext3_abort is a much stronger failure handler than ext3_error. The
272 * abort function may be used to deal with unrecoverable failures such
273 * as journal IO errors or ENOMEM at a critical moment in log management.
274 *
275 * We unconditionally force the filesystem into an ABORT|READONLY state,
276 * unless the error response on the fs has been set to panic in which
277 * case we take the easy way out and panic immediately.
278 */
279
280 void ext3_abort(struct super_block *sb, const char *function,
281 const char *fmt, ...)
282 {
283 struct va_format vaf;
284 va_list args;
285
286 va_start(args, fmt);
287
288 vaf.fmt = fmt;
289 vaf.va = &args;
290
291 printk(KERN_CRIT "EXT3-fs (%s): error: %s: %pV\n",
292 sb->s_id, function, &vaf);
293
294 va_end(args);
295
296 if (test_opt(sb, ERRORS_PANIC))
297 panic("EXT3-fs: panic from previous error\n");
298
299 if (sb->s_flags & MS_RDONLY)
300 return;
301
302 ext3_msg(sb, KERN_CRIT,
303 "error: remounting filesystem read-only");
304 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
305 sb->s_flags |= MS_RDONLY;
306 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
307 if (EXT3_SB(sb)->s_journal)
308 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
309 }
310
311 void ext3_warning(struct super_block *sb, const char *function,
312 const char *fmt, ...)
313 {
314 struct va_format vaf;
315 va_list args;
316
317 va_start(args, fmt);
318
319 vaf.fmt = fmt;
320 vaf.va = &args;
321
322 printk(KERN_WARNING "EXT3-fs (%s): warning: %s: %pV\n",
323 sb->s_id, function, &vaf);
324
325 va_end(args);
326 }
327
328 void ext3_update_dynamic_rev(struct super_block *sb)
329 {
330 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
331
332 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
333 return;
334
335 ext3_msg(sb, KERN_WARNING,
336 "warning: updating to rev %d because of "
337 "new feature flag, running e2fsck is recommended",
338 EXT3_DYNAMIC_REV);
339
340 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
341 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
342 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
343 /* leave es->s_feature_*compat flags alone */
344 /* es->s_uuid will be set by e2fsck if empty */
345
346 /*
347 * The rest of the superblock fields should be zero, and if not it
348 * means they are likely already in use, so leave them alone. We
349 * can leave it up to e2fsck to clean up any inconsistencies there.
350 */
351 }
352
353 /*
354 * Open the external journal device
355 */
356 static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
357 {
358 struct block_device *bdev;
359 char b[BDEVNAME_SIZE];
360
361 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
362 if (IS_ERR(bdev))
363 goto fail;
364 return bdev;
365
366 fail:
367 ext3_msg(sb, KERN_ERR, "error: failed to open journal device %s: %ld",
368 __bdevname(dev, b), PTR_ERR(bdev));
369
370 return NULL;
371 }
372
373 /*
374 * Release the journal device
375 */
376 static int ext3_blkdev_put(struct block_device *bdev)
377 {
378 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
379 }
380
381 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
382 {
383 struct block_device *bdev;
384 int ret = -ENODEV;
385
386 bdev = sbi->journal_bdev;
387 if (bdev) {
388 ret = ext3_blkdev_put(bdev);
389 sbi->journal_bdev = NULL;
390 }
391 return ret;
392 }
393
394 static inline struct inode *orphan_list_entry(struct list_head *l)
395 {
396 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
397 }
398
399 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
400 {
401 struct list_head *l;
402
403 ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
404 le32_to_cpu(sbi->s_es->s_last_orphan));
405
406 ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
407 list_for_each(l, &sbi->s_orphan) {
408 struct inode *inode = orphan_list_entry(l);
409 ext3_msg(sb, KERN_ERR, " "
410 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
411 inode->i_sb->s_id, inode->i_ino, inode,
412 inode->i_mode, inode->i_nlink,
413 NEXT_ORPHAN(inode));
414 }
415 }
416
417 static void ext3_put_super (struct super_block * sb)
418 {
419 struct ext3_sb_info *sbi = EXT3_SB(sb);
420 struct ext3_super_block *es = sbi->s_es;
421 int i, err;
422
423 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
424 ext3_xattr_put_super(sb);
425 err = journal_destroy(sbi->s_journal);
426 sbi->s_journal = NULL;
427 if (err < 0)
428 ext3_abort(sb, __func__, "Couldn't clean up the journal");
429
430 if (!(sb->s_flags & MS_RDONLY)) {
431 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
432 es->s_state = cpu_to_le16(sbi->s_mount_state);
433 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
434 mark_buffer_dirty(sbi->s_sbh);
435 ext3_commit_super(sb, es, 1);
436 }
437
438 for (i = 0; i < sbi->s_gdb_count; i++)
439 brelse(sbi->s_group_desc[i]);
440 kfree(sbi->s_group_desc);
441 percpu_counter_destroy(&sbi->s_freeblocks_counter);
442 percpu_counter_destroy(&sbi->s_freeinodes_counter);
443 percpu_counter_destroy(&sbi->s_dirs_counter);
444 brelse(sbi->s_sbh);
445 #ifdef CONFIG_QUOTA
446 for (i = 0; i < MAXQUOTAS; i++)
447 kfree(sbi->s_qf_names[i]);
448 #endif
449
450 /* Debugging code just in case the in-memory inode orphan list
451 * isn't empty. The on-disk one can be non-empty if we've
452 * detected an error and taken the fs readonly, but the
453 * in-memory list had better be clean by this point. */
454 if (!list_empty(&sbi->s_orphan))
455 dump_orphan_list(sb, sbi);
456 J_ASSERT(list_empty(&sbi->s_orphan));
457
458 invalidate_bdev(sb->s_bdev);
459 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
460 /*
461 * Invalidate the journal device's buffers. We don't want them
462 * floating about in memory - the physical journal device may
463 * hotswapped, and it breaks the `ro-after' testing code.
464 */
465 sync_blockdev(sbi->journal_bdev);
466 invalidate_bdev(sbi->journal_bdev);
467 ext3_blkdev_remove(sbi);
468 }
469 sb->s_fs_info = NULL;
470 kfree(sbi->s_blockgroup_lock);
471 kfree(sbi);
472 }
473
474 static struct kmem_cache *ext3_inode_cachep;
475
476 /*
477 * Called inside transaction, so use GFP_NOFS
478 */
479 static struct inode *ext3_alloc_inode(struct super_block *sb)
480 {
481 struct ext3_inode_info *ei;
482
483 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
484 if (!ei)
485 return NULL;
486 ei->i_block_alloc_info = NULL;
487 ei->vfs_inode.i_version = 1;
488 atomic_set(&ei->i_datasync_tid, 0);
489 atomic_set(&ei->i_sync_tid, 0);
490 return &ei->vfs_inode;
491 }
492
493 static int ext3_drop_inode(struct inode *inode)
494 {
495 int drop = generic_drop_inode(inode);
496
497 trace_ext3_drop_inode(inode, drop);
498 return drop;
499 }
500
501 static void ext3_i_callback(struct rcu_head *head)
502 {
503 struct inode *inode = container_of(head, struct inode, i_rcu);
504 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
505 }
506
507 static void ext3_destroy_inode(struct inode *inode)
508 {
509 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
510 printk("EXT3 Inode %p: orphan list check failed!\n",
511 EXT3_I(inode));
512 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
513 EXT3_I(inode), sizeof(struct ext3_inode_info),
514 false);
515 dump_stack();
516 }
517 call_rcu(&inode->i_rcu, ext3_i_callback);
518 }
519
520 static void init_once(void *foo)
521 {
522 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
523
524 INIT_LIST_HEAD(&ei->i_orphan);
525 #ifdef CONFIG_EXT3_FS_XATTR
526 init_rwsem(&ei->xattr_sem);
527 #endif
528 mutex_init(&ei->truncate_mutex);
529 inode_init_once(&ei->vfs_inode);
530 }
531
532 static int init_inodecache(void)
533 {
534 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
535 sizeof(struct ext3_inode_info),
536 0, (SLAB_RECLAIM_ACCOUNT|
537 SLAB_MEM_SPREAD),
538 init_once);
539 if (ext3_inode_cachep == NULL)
540 return -ENOMEM;
541 return 0;
542 }
543
544 static void destroy_inodecache(void)
545 {
546 kmem_cache_destroy(ext3_inode_cachep);
547 }
548
549 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
550 {
551 #if defined(CONFIG_QUOTA)
552 struct ext3_sb_info *sbi = EXT3_SB(sb);
553
554 if (sbi->s_jquota_fmt) {
555 char *fmtname = "";
556
557 switch (sbi->s_jquota_fmt) {
558 case QFMT_VFS_OLD:
559 fmtname = "vfsold";
560 break;
561 case QFMT_VFS_V0:
562 fmtname = "vfsv0";
563 break;
564 case QFMT_VFS_V1:
565 fmtname = "vfsv1";
566 break;
567 }
568 seq_printf(seq, ",jqfmt=%s", fmtname);
569 }
570
571 if (sbi->s_qf_names[USRQUOTA])
572 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
573
574 if (sbi->s_qf_names[GRPQUOTA])
575 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
576
577 if (test_opt(sb, USRQUOTA))
578 seq_puts(seq, ",usrquota");
579
580 if (test_opt(sb, GRPQUOTA))
581 seq_puts(seq, ",grpquota");
582 #endif
583 }
584
585 static char *data_mode_string(unsigned long mode)
586 {
587 switch (mode) {
588 case EXT3_MOUNT_JOURNAL_DATA:
589 return "journal";
590 case EXT3_MOUNT_ORDERED_DATA:
591 return "ordered";
592 case EXT3_MOUNT_WRITEBACK_DATA:
593 return "writeback";
594 }
595 return "unknown";
596 }
597
598 /*
599 * Show an option if
600 * - it's set to a non-default value OR
601 * - if the per-sb default is different from the global default
602 */
603 static int ext3_show_options(struct seq_file *seq, struct dentry *root)
604 {
605 struct super_block *sb = root->d_sb;
606 struct ext3_sb_info *sbi = EXT3_SB(sb);
607 struct ext3_super_block *es = sbi->s_es;
608 unsigned long def_mount_opts;
609
610 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
611
612 if (sbi->s_sb_block != 1)
613 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
614 if (test_opt(sb, MINIX_DF))
615 seq_puts(seq, ",minixdf");
616 if (test_opt(sb, GRPID))
617 seq_puts(seq, ",grpid");
618 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
619 seq_puts(seq, ",nogrpid");
620 if (sbi->s_resuid != EXT3_DEF_RESUID ||
621 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
622 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
623 }
624 if (sbi->s_resgid != EXT3_DEF_RESGID ||
625 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
626 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
627 }
628 if (test_opt(sb, ERRORS_RO)) {
629 int def_errors = le16_to_cpu(es->s_errors);
630
631 if (def_errors == EXT3_ERRORS_PANIC ||
632 def_errors == EXT3_ERRORS_CONTINUE) {
633 seq_puts(seq, ",errors=remount-ro");
634 }
635 }
636 if (test_opt(sb, ERRORS_CONT))
637 seq_puts(seq, ",errors=continue");
638 if (test_opt(sb, ERRORS_PANIC))
639 seq_puts(seq, ",errors=panic");
640 if (test_opt(sb, NO_UID32))
641 seq_puts(seq, ",nouid32");
642 if (test_opt(sb, DEBUG))
643 seq_puts(seq, ",debug");
644 #ifdef CONFIG_EXT3_FS_XATTR
645 if (test_opt(sb, XATTR_USER))
646 seq_puts(seq, ",user_xattr");
647 if (!test_opt(sb, XATTR_USER) &&
648 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
649 seq_puts(seq, ",nouser_xattr");
650 }
651 #endif
652 #ifdef CONFIG_EXT3_FS_POSIX_ACL
653 if (test_opt(sb, POSIX_ACL))
654 seq_puts(seq, ",acl");
655 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
656 seq_puts(seq, ",noacl");
657 #endif
658 if (!test_opt(sb, RESERVATION))
659 seq_puts(seq, ",noreservation");
660 if (sbi->s_commit_interval) {
661 seq_printf(seq, ",commit=%u",
662 (unsigned) (sbi->s_commit_interval / HZ));
663 }
664
665 /*
666 * Always display barrier state so it's clear what the status is.
667 */
668 seq_puts(seq, ",barrier=");
669 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
670 seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
671 if (test_opt(sb, DATA_ERR_ABORT))
672 seq_puts(seq, ",data_err=abort");
673
674 if (test_opt(sb, NOLOAD))
675 seq_puts(seq, ",norecovery");
676
677 ext3_show_quota_options(seq, sb);
678
679 return 0;
680 }
681
682
683 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
684 u64 ino, u32 generation)
685 {
686 struct inode *inode;
687
688 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
689 return ERR_PTR(-ESTALE);
690 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
691 return ERR_PTR(-ESTALE);
692
693 /* iget isn't really right if the inode is currently unallocated!!
694 *
695 * ext3_read_inode will return a bad_inode if the inode had been
696 * deleted, so we should be safe.
697 *
698 * Currently we don't know the generation for parent directory, so
699 * a generation of 0 means "accept any"
700 */
701 inode = ext3_iget(sb, ino);
702 if (IS_ERR(inode))
703 return ERR_CAST(inode);
704 if (generation && inode->i_generation != generation) {
705 iput(inode);
706 return ERR_PTR(-ESTALE);
707 }
708
709 return inode;
710 }
711
712 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
713 int fh_len, int fh_type)
714 {
715 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
716 ext3_nfs_get_inode);
717 }
718
719 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
720 int fh_len, int fh_type)
721 {
722 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
723 ext3_nfs_get_inode);
724 }
725
726 /*
727 * Try to release metadata pages (indirect blocks, directories) which are
728 * mapped via the block device. Since these pages could have journal heads
729 * which would prevent try_to_free_buffers() from freeing them, we must use
730 * jbd layer's try_to_free_buffers() function to release them.
731 */
732 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
733 gfp_t wait)
734 {
735 journal_t *journal = EXT3_SB(sb)->s_journal;
736
737 WARN_ON(PageChecked(page));
738 if (!page_has_buffers(page))
739 return 0;
740 if (journal)
741 return journal_try_to_free_buffers(journal, page,
742 wait & ~__GFP_WAIT);
743 return try_to_free_buffers(page);
744 }
745
746 #ifdef CONFIG_QUOTA
747 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
748 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
749
750 static int ext3_write_dquot(struct dquot *dquot);
751 static int ext3_acquire_dquot(struct dquot *dquot);
752 static int ext3_release_dquot(struct dquot *dquot);
753 static int ext3_mark_dquot_dirty(struct dquot *dquot);
754 static int ext3_write_info(struct super_block *sb, int type);
755 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
756 struct path *path);
757 static int ext3_quota_on_mount(struct super_block *sb, int type);
758 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
759 size_t len, loff_t off);
760 static ssize_t ext3_quota_write(struct super_block *sb, int type,
761 const char *data, size_t len, loff_t off);
762
763 static const struct dquot_operations ext3_quota_operations = {
764 .write_dquot = ext3_write_dquot,
765 .acquire_dquot = ext3_acquire_dquot,
766 .release_dquot = ext3_release_dquot,
767 .mark_dirty = ext3_mark_dquot_dirty,
768 .write_info = ext3_write_info,
769 .alloc_dquot = dquot_alloc,
770 .destroy_dquot = dquot_destroy,
771 };
772
773 static const struct quotactl_ops ext3_qctl_operations = {
774 .quota_on = ext3_quota_on,
775 .quota_off = dquot_quota_off,
776 .quota_sync = dquot_quota_sync,
777 .get_info = dquot_get_dqinfo,
778 .set_info = dquot_set_dqinfo,
779 .get_dqblk = dquot_get_dqblk,
780 .set_dqblk = dquot_set_dqblk
781 };
782 #endif
783
784 static const struct super_operations ext3_sops = {
785 .alloc_inode = ext3_alloc_inode,
786 .destroy_inode = ext3_destroy_inode,
787 .write_inode = ext3_write_inode,
788 .dirty_inode = ext3_dirty_inode,
789 .drop_inode = ext3_drop_inode,
790 .evict_inode = ext3_evict_inode,
791 .put_super = ext3_put_super,
792 .sync_fs = ext3_sync_fs,
793 .freeze_fs = ext3_freeze,
794 .unfreeze_fs = ext3_unfreeze,
795 .statfs = ext3_statfs,
796 .remount_fs = ext3_remount,
797 .show_options = ext3_show_options,
798 #ifdef CONFIG_QUOTA
799 .quota_read = ext3_quota_read,
800 .quota_write = ext3_quota_write,
801 #endif
802 .bdev_try_to_free_page = bdev_try_to_free_page,
803 };
804
805 static const struct export_operations ext3_export_ops = {
806 .fh_to_dentry = ext3_fh_to_dentry,
807 .fh_to_parent = ext3_fh_to_parent,
808 .get_parent = ext3_get_parent,
809 };
810
811 enum {
812 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
813 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
814 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
815 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
816 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
817 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
818 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
819 Opt_data_err_abort, Opt_data_err_ignore,
820 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
821 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
822 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
823 Opt_resize, Opt_usrquota, Opt_grpquota
824 };
825
826 static const match_table_t tokens = {
827 {Opt_bsd_df, "bsddf"},
828 {Opt_minix_df, "minixdf"},
829 {Opt_grpid, "grpid"},
830 {Opt_grpid, "bsdgroups"},
831 {Opt_nogrpid, "nogrpid"},
832 {Opt_nogrpid, "sysvgroups"},
833 {Opt_resgid, "resgid=%u"},
834 {Opt_resuid, "resuid=%u"},
835 {Opt_sb, "sb=%u"},
836 {Opt_err_cont, "errors=continue"},
837 {Opt_err_panic, "errors=panic"},
838 {Opt_err_ro, "errors=remount-ro"},
839 {Opt_nouid32, "nouid32"},
840 {Opt_nocheck, "nocheck"},
841 {Opt_nocheck, "check=none"},
842 {Opt_debug, "debug"},
843 {Opt_oldalloc, "oldalloc"},
844 {Opt_orlov, "orlov"},
845 {Opt_user_xattr, "user_xattr"},
846 {Opt_nouser_xattr, "nouser_xattr"},
847 {Opt_acl, "acl"},
848 {Opt_noacl, "noacl"},
849 {Opt_reservation, "reservation"},
850 {Opt_noreservation, "noreservation"},
851 {Opt_noload, "noload"},
852 {Opt_noload, "norecovery"},
853 {Opt_nobh, "nobh"},
854 {Opt_bh, "bh"},
855 {Opt_commit, "commit=%u"},
856 {Opt_journal_update, "journal=update"},
857 {Opt_journal_inum, "journal=%u"},
858 {Opt_journal_dev, "journal_dev=%u"},
859 {Opt_abort, "abort"},
860 {Opt_data_journal, "data=journal"},
861 {Opt_data_ordered, "data=ordered"},
862 {Opt_data_writeback, "data=writeback"},
863 {Opt_data_err_abort, "data_err=abort"},
864 {Opt_data_err_ignore, "data_err=ignore"},
865 {Opt_offusrjquota, "usrjquota="},
866 {Opt_usrjquota, "usrjquota=%s"},
867 {Opt_offgrpjquota, "grpjquota="},
868 {Opt_grpjquota, "grpjquota=%s"},
869 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
870 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
871 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
872 {Opt_grpquota, "grpquota"},
873 {Opt_noquota, "noquota"},
874 {Opt_quota, "quota"},
875 {Opt_usrquota, "usrquota"},
876 {Opt_barrier, "barrier=%u"},
877 {Opt_barrier, "barrier"},
878 {Opt_nobarrier, "nobarrier"},
879 {Opt_resize, "resize"},
880 {Opt_err, NULL},
881 };
882
883 static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
884 {
885 ext3_fsblk_t sb_block;
886 char *options = (char *) *data;
887
888 if (!options || strncmp(options, "sb=", 3) != 0)
889 return 1; /* Default location */
890 options += 3;
891 /*todo: use simple_strtoll with >32bit ext3 */
892 sb_block = simple_strtoul(options, &options, 0);
893 if (*options && *options != ',') {
894 ext3_msg(sb, KERN_ERR, "error: invalid sb specification: %s",
895 (char *) *data);
896 return 1;
897 }
898 if (*options == ',')
899 options++;
900 *data = (void *) options;
901 return sb_block;
902 }
903
904 #ifdef CONFIG_QUOTA
905 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
906 {
907 struct ext3_sb_info *sbi = EXT3_SB(sb);
908 char *qname;
909
910 if (sb_any_quota_loaded(sb) &&
911 !sbi->s_qf_names[qtype]) {
912 ext3_msg(sb, KERN_ERR,
913 "Cannot change journaled "
914 "quota options when quota turned on");
915 return 0;
916 }
917 qname = match_strdup(args);
918 if (!qname) {
919 ext3_msg(sb, KERN_ERR,
920 "Not enough memory for storing quotafile name");
921 return 0;
922 }
923 if (sbi->s_qf_names[qtype] &&
924 strcmp(sbi->s_qf_names[qtype], qname)) {
925 ext3_msg(sb, KERN_ERR,
926 "%s quota file already specified", QTYPE2NAME(qtype));
927 kfree(qname);
928 return 0;
929 }
930 sbi->s_qf_names[qtype] = qname;
931 if (strchr(sbi->s_qf_names[qtype], '/')) {
932 ext3_msg(sb, KERN_ERR,
933 "quotafile must be on filesystem root");
934 kfree(sbi->s_qf_names[qtype]);
935 sbi->s_qf_names[qtype] = NULL;
936 return 0;
937 }
938 set_opt(sbi->s_mount_opt, QUOTA);
939 return 1;
940 }
941
942 static int clear_qf_name(struct super_block *sb, int qtype) {
943
944 struct ext3_sb_info *sbi = EXT3_SB(sb);
945
946 if (sb_any_quota_loaded(sb) &&
947 sbi->s_qf_names[qtype]) {
948 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
949 " when quota turned on");
950 return 0;
951 }
952 /*
953 * The space will be released later when all options are confirmed
954 * to be correct
955 */
956 sbi->s_qf_names[qtype] = NULL;
957 return 1;
958 }
959 #endif
960
961 static int parse_options (char *options, struct super_block *sb,
962 unsigned int *inum, unsigned long *journal_devnum,
963 ext3_fsblk_t *n_blocks_count, int is_remount)
964 {
965 struct ext3_sb_info *sbi = EXT3_SB(sb);
966 char * p;
967 substring_t args[MAX_OPT_ARGS];
968 int data_opt = 0;
969 int option;
970 #ifdef CONFIG_QUOTA
971 int qfmt;
972 #endif
973
974 if (!options)
975 return 1;
976
977 while ((p = strsep (&options, ",")) != NULL) {
978 int token;
979 if (!*p)
980 continue;
981 /*
982 * Initialize args struct so we know whether arg was
983 * found; some options take optional arguments.
984 */
985 args[0].to = args[0].from = 0;
986 token = match_token(p, tokens, args);
987 switch (token) {
988 case Opt_bsd_df:
989 clear_opt (sbi->s_mount_opt, MINIX_DF);
990 break;
991 case Opt_minix_df:
992 set_opt (sbi->s_mount_opt, MINIX_DF);
993 break;
994 case Opt_grpid:
995 set_opt (sbi->s_mount_opt, GRPID);
996 break;
997 case Opt_nogrpid:
998 clear_opt (sbi->s_mount_opt, GRPID);
999 break;
1000 case Opt_resuid:
1001 if (match_int(&args[0], &option))
1002 return 0;
1003 sbi->s_resuid = option;
1004 break;
1005 case Opt_resgid:
1006 if (match_int(&args[0], &option))
1007 return 0;
1008 sbi->s_resgid = option;
1009 break;
1010 case Opt_sb:
1011 /* handled by get_sb_block() instead of here */
1012 /* *sb_block = match_int(&args[0]); */
1013 break;
1014 case Opt_err_panic:
1015 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1016 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1017 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1018 break;
1019 case Opt_err_ro:
1020 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1021 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1022 set_opt (sbi->s_mount_opt, ERRORS_RO);
1023 break;
1024 case Opt_err_cont:
1025 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1026 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1027 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1028 break;
1029 case Opt_nouid32:
1030 set_opt (sbi->s_mount_opt, NO_UID32);
1031 break;
1032 case Opt_nocheck:
1033 clear_opt (sbi->s_mount_opt, CHECK);
1034 break;
1035 case Opt_debug:
1036 set_opt (sbi->s_mount_opt, DEBUG);
1037 break;
1038 case Opt_oldalloc:
1039 ext3_msg(sb, KERN_WARNING,
1040 "Ignoring deprecated oldalloc option");
1041 break;
1042 case Opt_orlov:
1043 ext3_msg(sb, KERN_WARNING,
1044 "Ignoring deprecated orlov option");
1045 break;
1046 #ifdef CONFIG_EXT3_FS_XATTR
1047 case Opt_user_xattr:
1048 set_opt (sbi->s_mount_opt, XATTR_USER);
1049 break;
1050 case Opt_nouser_xattr:
1051 clear_opt (sbi->s_mount_opt, XATTR_USER);
1052 break;
1053 #else
1054 case Opt_user_xattr:
1055 case Opt_nouser_xattr:
1056 ext3_msg(sb, KERN_INFO,
1057 "(no)user_xattr options not supported");
1058 break;
1059 #endif
1060 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1061 case Opt_acl:
1062 set_opt(sbi->s_mount_opt, POSIX_ACL);
1063 break;
1064 case Opt_noacl:
1065 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1066 break;
1067 #else
1068 case Opt_acl:
1069 case Opt_noacl:
1070 ext3_msg(sb, KERN_INFO,
1071 "(no)acl options not supported");
1072 break;
1073 #endif
1074 case Opt_reservation:
1075 set_opt(sbi->s_mount_opt, RESERVATION);
1076 break;
1077 case Opt_noreservation:
1078 clear_opt(sbi->s_mount_opt, RESERVATION);
1079 break;
1080 case Opt_journal_update:
1081 /* @@@ FIXME */
1082 /* Eventually we will want to be able to create
1083 a journal file here. For now, only allow the
1084 user to specify an existing inode to be the
1085 journal file. */
1086 if (is_remount) {
1087 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1088 "journal on remount");
1089 return 0;
1090 }
1091 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1092 break;
1093 case Opt_journal_inum:
1094 if (is_remount) {
1095 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1096 "journal on remount");
1097 return 0;
1098 }
1099 if (match_int(&args[0], &option))
1100 return 0;
1101 *inum = option;
1102 break;
1103 case Opt_journal_dev:
1104 if (is_remount) {
1105 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1106 "journal on remount");
1107 return 0;
1108 }
1109 if (match_int(&args[0], &option))
1110 return 0;
1111 *journal_devnum = option;
1112 break;
1113 case Opt_noload:
1114 set_opt (sbi->s_mount_opt, NOLOAD);
1115 break;
1116 case Opt_commit:
1117 if (match_int(&args[0], &option))
1118 return 0;
1119 if (option < 0)
1120 return 0;
1121 if (option == 0)
1122 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1123 sbi->s_commit_interval = HZ * option;
1124 break;
1125 case Opt_data_journal:
1126 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1127 goto datacheck;
1128 case Opt_data_ordered:
1129 data_opt = EXT3_MOUNT_ORDERED_DATA;
1130 goto datacheck;
1131 case Opt_data_writeback:
1132 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1133 datacheck:
1134 if (is_remount) {
1135 if (test_opt(sb, DATA_FLAGS) == data_opt)
1136 break;
1137 ext3_msg(sb, KERN_ERR,
1138 "error: cannot change "
1139 "data mode on remount. The filesystem "
1140 "is mounted in data=%s mode and you "
1141 "try to remount it in data=%s mode.",
1142 data_mode_string(test_opt(sb,
1143 DATA_FLAGS)),
1144 data_mode_string(data_opt));
1145 return 0;
1146 } else {
1147 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1148 sbi->s_mount_opt |= data_opt;
1149 }
1150 break;
1151 case Opt_data_err_abort:
1152 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1153 break;
1154 case Opt_data_err_ignore:
1155 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1156 break;
1157 #ifdef CONFIG_QUOTA
1158 case Opt_usrjquota:
1159 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1160 return 0;
1161 break;
1162 case Opt_grpjquota:
1163 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1164 return 0;
1165 break;
1166 case Opt_offusrjquota:
1167 if (!clear_qf_name(sb, USRQUOTA))
1168 return 0;
1169 break;
1170 case Opt_offgrpjquota:
1171 if (!clear_qf_name(sb, GRPQUOTA))
1172 return 0;
1173 break;
1174 case Opt_jqfmt_vfsold:
1175 qfmt = QFMT_VFS_OLD;
1176 goto set_qf_format;
1177 case Opt_jqfmt_vfsv0:
1178 qfmt = QFMT_VFS_V0;
1179 goto set_qf_format;
1180 case Opt_jqfmt_vfsv1:
1181 qfmt = QFMT_VFS_V1;
1182 set_qf_format:
1183 if (sb_any_quota_loaded(sb) &&
1184 sbi->s_jquota_fmt != qfmt) {
1185 ext3_msg(sb, KERN_ERR, "error: cannot change "
1186 "journaled quota options when "
1187 "quota turned on.");
1188 return 0;
1189 }
1190 sbi->s_jquota_fmt = qfmt;
1191 break;
1192 case Opt_quota:
1193 case Opt_usrquota:
1194 set_opt(sbi->s_mount_opt, QUOTA);
1195 set_opt(sbi->s_mount_opt, USRQUOTA);
1196 break;
1197 case Opt_grpquota:
1198 set_opt(sbi->s_mount_opt, QUOTA);
1199 set_opt(sbi->s_mount_opt, GRPQUOTA);
1200 break;
1201 case Opt_noquota:
1202 if (sb_any_quota_loaded(sb)) {
1203 ext3_msg(sb, KERN_ERR, "error: cannot change "
1204 "quota options when quota turned on.");
1205 return 0;
1206 }
1207 clear_opt(sbi->s_mount_opt, QUOTA);
1208 clear_opt(sbi->s_mount_opt, USRQUOTA);
1209 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1210 break;
1211 #else
1212 case Opt_quota:
1213 case Opt_usrquota:
1214 case Opt_grpquota:
1215 ext3_msg(sb, KERN_ERR,
1216 "error: quota options not supported.");
1217 break;
1218 case Opt_usrjquota:
1219 case Opt_grpjquota:
1220 case Opt_offusrjquota:
1221 case Opt_offgrpjquota:
1222 case Opt_jqfmt_vfsold:
1223 case Opt_jqfmt_vfsv0:
1224 case Opt_jqfmt_vfsv1:
1225 ext3_msg(sb, KERN_ERR,
1226 "error: journaled quota options not "
1227 "supported.");
1228 break;
1229 case Opt_noquota:
1230 break;
1231 #endif
1232 case Opt_abort:
1233 set_opt(sbi->s_mount_opt, ABORT);
1234 break;
1235 case Opt_nobarrier:
1236 clear_opt(sbi->s_mount_opt, BARRIER);
1237 break;
1238 case Opt_barrier:
1239 if (args[0].from) {
1240 if (match_int(&args[0], &option))
1241 return 0;
1242 } else
1243 option = 1; /* No argument, default to 1 */
1244 if (option)
1245 set_opt(sbi->s_mount_opt, BARRIER);
1246 else
1247 clear_opt(sbi->s_mount_opt, BARRIER);
1248 break;
1249 case Opt_ignore:
1250 break;
1251 case Opt_resize:
1252 if (!is_remount) {
1253 ext3_msg(sb, KERN_ERR,
1254 "error: resize option only available "
1255 "for remount");
1256 return 0;
1257 }
1258 if (match_int(&args[0], &option) != 0)
1259 return 0;
1260 *n_blocks_count = option;
1261 break;
1262 case Opt_nobh:
1263 ext3_msg(sb, KERN_WARNING,
1264 "warning: ignoring deprecated nobh option");
1265 break;
1266 case Opt_bh:
1267 ext3_msg(sb, KERN_WARNING,
1268 "warning: ignoring deprecated bh option");
1269 break;
1270 default:
1271 ext3_msg(sb, KERN_ERR,
1272 "error: unrecognized mount option \"%s\" "
1273 "or missing value", p);
1274 return 0;
1275 }
1276 }
1277 #ifdef CONFIG_QUOTA
1278 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1279 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1280 clear_opt(sbi->s_mount_opt, USRQUOTA);
1281 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1282 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1283
1284 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1285 ext3_msg(sb, KERN_ERR, "error: old and new quota "
1286 "format mixing.");
1287 return 0;
1288 }
1289
1290 if (!sbi->s_jquota_fmt) {
1291 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1292 "not specified.");
1293 return 0;
1294 }
1295 } else {
1296 if (sbi->s_jquota_fmt) {
1297 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1298 "specified with no journaling "
1299 "enabled.");
1300 return 0;
1301 }
1302 }
1303 #endif
1304 return 1;
1305 }
1306
1307 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1308 int read_only)
1309 {
1310 struct ext3_sb_info *sbi = EXT3_SB(sb);
1311 int res = 0;
1312
1313 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1314 ext3_msg(sb, KERN_ERR,
1315 "error: revision level too high, "
1316 "forcing read-only mode");
1317 res = MS_RDONLY;
1318 }
1319 if (read_only)
1320 return res;
1321 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1322 ext3_msg(sb, KERN_WARNING,
1323 "warning: mounting unchecked fs, "
1324 "running e2fsck is recommended");
1325 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1326 ext3_msg(sb, KERN_WARNING,
1327 "warning: mounting fs with errors, "
1328 "running e2fsck is recommended");
1329 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1330 le16_to_cpu(es->s_mnt_count) >=
1331 le16_to_cpu(es->s_max_mnt_count))
1332 ext3_msg(sb, KERN_WARNING,
1333 "warning: maximal mount count reached, "
1334 "running e2fsck is recommended");
1335 else if (le32_to_cpu(es->s_checkinterval) &&
1336 (le32_to_cpu(es->s_lastcheck) +
1337 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1338 ext3_msg(sb, KERN_WARNING,
1339 "warning: checktime reached, "
1340 "running e2fsck is recommended");
1341 #if 0
1342 /* @@@ We _will_ want to clear the valid bit if we find
1343 inconsistencies, to force a fsck at reboot. But for
1344 a plain journaled filesystem we can keep it set as
1345 valid forever! :) */
1346 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1347 #endif
1348 if (!le16_to_cpu(es->s_max_mnt_count))
1349 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1350 le16_add_cpu(&es->s_mnt_count, 1);
1351 es->s_mtime = cpu_to_le32(get_seconds());
1352 ext3_update_dynamic_rev(sb);
1353 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1354
1355 ext3_commit_super(sb, es, 1);
1356 if (test_opt(sb, DEBUG))
1357 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1358 "bpg=%lu, ipg=%lu, mo=%04lx]",
1359 sb->s_blocksize,
1360 sbi->s_groups_count,
1361 EXT3_BLOCKS_PER_GROUP(sb),
1362 EXT3_INODES_PER_GROUP(sb),
1363 sbi->s_mount_opt);
1364
1365 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1366 char b[BDEVNAME_SIZE];
1367 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1368 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1369 } else {
1370 ext3_msg(sb, KERN_INFO, "using internal journal");
1371 }
1372 cleancache_init_fs(sb);
1373 return res;
1374 }
1375
1376 /* Called at mount-time, super-block is locked */
1377 static int ext3_check_descriptors(struct super_block *sb)
1378 {
1379 struct ext3_sb_info *sbi = EXT3_SB(sb);
1380 int i;
1381
1382 ext3_debug ("Checking group descriptors");
1383
1384 for (i = 0; i < sbi->s_groups_count; i++) {
1385 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1386 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1387 ext3_fsblk_t last_block;
1388
1389 if (i == sbi->s_groups_count - 1)
1390 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1391 else
1392 last_block = first_block +
1393 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1394
1395 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1396 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1397 {
1398 ext3_error (sb, "ext3_check_descriptors",
1399 "Block bitmap for group %d"
1400 " not in group (block %lu)!",
1401 i, (unsigned long)
1402 le32_to_cpu(gdp->bg_block_bitmap));
1403 return 0;
1404 }
1405 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1406 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1407 {
1408 ext3_error (sb, "ext3_check_descriptors",
1409 "Inode bitmap for group %d"
1410 " not in group (block %lu)!",
1411 i, (unsigned long)
1412 le32_to_cpu(gdp->bg_inode_bitmap));
1413 return 0;
1414 }
1415 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1416 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1417 last_block)
1418 {
1419 ext3_error (sb, "ext3_check_descriptors",
1420 "Inode table for group %d"
1421 " not in group (block %lu)!",
1422 i, (unsigned long)
1423 le32_to_cpu(gdp->bg_inode_table));
1424 return 0;
1425 }
1426 }
1427
1428 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1429 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1430 return 1;
1431 }
1432
1433
1434 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1435 * the superblock) which were deleted from all directories, but held open by
1436 * a process at the time of a crash. We walk the list and try to delete these
1437 * inodes at recovery time (only with a read-write filesystem).
1438 *
1439 * In order to keep the orphan inode chain consistent during traversal (in
1440 * case of crash during recovery), we link each inode into the superblock
1441 * orphan list_head and handle it the same way as an inode deletion during
1442 * normal operation (which journals the operations for us).
1443 *
1444 * We only do an iget() and an iput() on each inode, which is very safe if we
1445 * accidentally point at an in-use or already deleted inode. The worst that
1446 * can happen in this case is that we get a "bit already cleared" message from
1447 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1448 * e2fsck was run on this filesystem, and it must have already done the orphan
1449 * inode cleanup for us, so we can safely abort without any further action.
1450 */
1451 static void ext3_orphan_cleanup (struct super_block * sb,
1452 struct ext3_super_block * es)
1453 {
1454 unsigned int s_flags = sb->s_flags;
1455 int nr_orphans = 0, nr_truncates = 0;
1456 #ifdef CONFIG_QUOTA
1457 int i;
1458 #endif
1459 if (!es->s_last_orphan) {
1460 jbd_debug(4, "no orphan inodes to clean up\n");
1461 return;
1462 }
1463
1464 if (bdev_read_only(sb->s_bdev)) {
1465 ext3_msg(sb, KERN_ERR, "error: write access "
1466 "unavailable, skipping orphan cleanup.");
1467 return;
1468 }
1469
1470 /* Check if feature set allows readwrite operations */
1471 if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) {
1472 ext3_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
1473 "unknown ROCOMPAT features");
1474 return;
1475 }
1476
1477 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1478 if (es->s_last_orphan)
1479 jbd_debug(1, "Errors on filesystem, "
1480 "clearing orphan list.\n");
1481 es->s_last_orphan = 0;
1482 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1483 return;
1484 }
1485
1486 if (s_flags & MS_RDONLY) {
1487 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1488 sb->s_flags &= ~MS_RDONLY;
1489 }
1490 #ifdef CONFIG_QUOTA
1491 /* Needed for iput() to work correctly and not trash data */
1492 sb->s_flags |= MS_ACTIVE;
1493 /* Turn on quotas so that they are updated correctly */
1494 for (i = 0; i < MAXQUOTAS; i++) {
1495 if (EXT3_SB(sb)->s_qf_names[i]) {
1496 int ret = ext3_quota_on_mount(sb, i);
1497 if (ret < 0)
1498 ext3_msg(sb, KERN_ERR,
1499 "error: cannot turn on journaled "
1500 "quota: %d", ret);
1501 }
1502 }
1503 #endif
1504
1505 while (es->s_last_orphan) {
1506 struct inode *inode;
1507
1508 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1509 if (IS_ERR(inode)) {
1510 es->s_last_orphan = 0;
1511 break;
1512 }
1513
1514 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1515 dquot_initialize(inode);
1516 if (inode->i_nlink) {
1517 printk(KERN_DEBUG
1518 "%s: truncating inode %lu to %Ld bytes\n",
1519 __func__, inode->i_ino, inode->i_size);
1520 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1521 inode->i_ino, inode->i_size);
1522 ext3_truncate(inode);
1523 nr_truncates++;
1524 } else {
1525 printk(KERN_DEBUG
1526 "%s: deleting unreferenced inode %lu\n",
1527 __func__, inode->i_ino);
1528 jbd_debug(2, "deleting unreferenced inode %lu\n",
1529 inode->i_ino);
1530 nr_orphans++;
1531 }
1532 iput(inode); /* The delete magic happens here! */
1533 }
1534
1535 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1536
1537 if (nr_orphans)
1538 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1539 PLURAL(nr_orphans));
1540 if (nr_truncates)
1541 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1542 PLURAL(nr_truncates));
1543 #ifdef CONFIG_QUOTA
1544 /* Turn quotas off */
1545 for (i = 0; i < MAXQUOTAS; i++) {
1546 if (sb_dqopt(sb)->files[i])
1547 dquot_quota_off(sb, i);
1548 }
1549 #endif
1550 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1551 }
1552
1553 /*
1554 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1555 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1556 * We need to be 1 filesystem block less than the 2^32 sector limit.
1557 */
1558 static loff_t ext3_max_size(int bits)
1559 {
1560 loff_t res = EXT3_NDIR_BLOCKS;
1561 int meta_blocks;
1562 loff_t upper_limit;
1563
1564 /* This is calculated to be the largest file size for a
1565 * dense, file such that the total number of
1566 * sectors in the file, including data and all indirect blocks,
1567 * does not exceed 2^32 -1
1568 * __u32 i_blocks representing the total number of
1569 * 512 bytes blocks of the file
1570 */
1571 upper_limit = (1LL << 32) - 1;
1572
1573 /* total blocks in file system block size */
1574 upper_limit >>= (bits - 9);
1575
1576
1577 /* indirect blocks */
1578 meta_blocks = 1;
1579 /* double indirect blocks */
1580 meta_blocks += 1 + (1LL << (bits-2));
1581 /* tripple indirect blocks */
1582 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1583
1584 upper_limit -= meta_blocks;
1585 upper_limit <<= bits;
1586
1587 res += 1LL << (bits-2);
1588 res += 1LL << (2*(bits-2));
1589 res += 1LL << (3*(bits-2));
1590 res <<= bits;
1591 if (res > upper_limit)
1592 res = upper_limit;
1593
1594 if (res > MAX_LFS_FILESIZE)
1595 res = MAX_LFS_FILESIZE;
1596
1597 return res;
1598 }
1599
1600 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1601 ext3_fsblk_t logic_sb_block,
1602 int nr)
1603 {
1604 struct ext3_sb_info *sbi = EXT3_SB(sb);
1605 unsigned long bg, first_meta_bg;
1606 int has_super = 0;
1607
1608 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1609
1610 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1611 nr < first_meta_bg)
1612 return (logic_sb_block + nr + 1);
1613 bg = sbi->s_desc_per_block * nr;
1614 if (ext3_bg_has_super(sb, bg))
1615 has_super = 1;
1616 return (has_super + ext3_group_first_block_no(sb, bg));
1617 }
1618
1619
1620 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1621 {
1622 struct buffer_head * bh;
1623 struct ext3_super_block *es = NULL;
1624 struct ext3_sb_info *sbi;
1625 ext3_fsblk_t block;
1626 ext3_fsblk_t sb_block = get_sb_block(&data, sb);
1627 ext3_fsblk_t logic_sb_block;
1628 unsigned long offset = 0;
1629 unsigned int journal_inum = 0;
1630 unsigned long journal_devnum = 0;
1631 unsigned long def_mount_opts;
1632 struct inode *root;
1633 int blocksize;
1634 int hblock;
1635 int db_count;
1636 int i;
1637 int needs_recovery;
1638 int ret = -EINVAL;
1639 __le32 features;
1640 int err;
1641
1642 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1643 if (!sbi)
1644 return -ENOMEM;
1645
1646 sbi->s_blockgroup_lock =
1647 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1648 if (!sbi->s_blockgroup_lock) {
1649 kfree(sbi);
1650 return -ENOMEM;
1651 }
1652 sb->s_fs_info = sbi;
1653 sbi->s_mount_opt = 0;
1654 sbi->s_resuid = EXT3_DEF_RESUID;
1655 sbi->s_resgid = EXT3_DEF_RESGID;
1656 sbi->s_sb_block = sb_block;
1657
1658 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1659 if (!blocksize) {
1660 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1661 goto out_fail;
1662 }
1663
1664 /*
1665 * The ext3 superblock will not be buffer aligned for other than 1kB
1666 * block sizes. We need to calculate the offset from buffer start.
1667 */
1668 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1669 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1670 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1671 } else {
1672 logic_sb_block = sb_block;
1673 }
1674
1675 if (!(bh = sb_bread(sb, logic_sb_block))) {
1676 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1677 goto out_fail;
1678 }
1679 /*
1680 * Note: s_es must be initialized as soon as possible because
1681 * some ext3 macro-instructions depend on its value
1682 */
1683 es = (struct ext3_super_block *) (bh->b_data + offset);
1684 sbi->s_es = es;
1685 sb->s_magic = le16_to_cpu(es->s_magic);
1686 if (sb->s_magic != EXT3_SUPER_MAGIC)
1687 goto cantfind_ext3;
1688
1689 /* Set defaults before we parse the mount options */
1690 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1691 if (def_mount_opts & EXT3_DEFM_DEBUG)
1692 set_opt(sbi->s_mount_opt, DEBUG);
1693 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1694 set_opt(sbi->s_mount_opt, GRPID);
1695 if (def_mount_opts & EXT3_DEFM_UID16)
1696 set_opt(sbi->s_mount_opt, NO_UID32);
1697 #ifdef CONFIG_EXT3_FS_XATTR
1698 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1699 set_opt(sbi->s_mount_opt, XATTR_USER);
1700 #endif
1701 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1702 if (def_mount_opts & EXT3_DEFM_ACL)
1703 set_opt(sbi->s_mount_opt, POSIX_ACL);
1704 #endif
1705 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1706 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1707 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1708 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1709 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1710 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1711
1712 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1713 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1714 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1715 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1716 else
1717 set_opt(sbi->s_mount_opt, ERRORS_RO);
1718
1719 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1720 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1721
1722 /* enable barriers by default */
1723 set_opt(sbi->s_mount_opt, BARRIER);
1724 set_opt(sbi->s_mount_opt, RESERVATION);
1725
1726 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1727 NULL, 0))
1728 goto failed_mount;
1729
1730 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1731 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1732
1733 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1734 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1735 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1736 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1737 ext3_msg(sb, KERN_WARNING,
1738 "warning: feature flags set on rev 0 fs, "
1739 "running e2fsck is recommended");
1740 /*
1741 * Check feature flags regardless of the revision level, since we
1742 * previously didn't change the revision level when setting the flags,
1743 * so there is a chance incompat flags are set on a rev 0 filesystem.
1744 */
1745 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1746 if (features) {
1747 ext3_msg(sb, KERN_ERR,
1748 "error: couldn't mount because of unsupported "
1749 "optional features (%x)", le32_to_cpu(features));
1750 goto failed_mount;
1751 }
1752 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1753 if (!(sb->s_flags & MS_RDONLY) && features) {
1754 ext3_msg(sb, KERN_ERR,
1755 "error: couldn't mount RDWR because of unsupported "
1756 "optional features (%x)", le32_to_cpu(features));
1757 goto failed_mount;
1758 }
1759 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1760
1761 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1762 blocksize > EXT3_MAX_BLOCK_SIZE) {
1763 ext3_msg(sb, KERN_ERR,
1764 "error: couldn't mount because of unsupported "
1765 "filesystem blocksize %d", blocksize);
1766 goto failed_mount;
1767 }
1768
1769 hblock = bdev_logical_block_size(sb->s_bdev);
1770 if (sb->s_blocksize != blocksize) {
1771 /*
1772 * Make sure the blocksize for the filesystem is larger
1773 * than the hardware sectorsize for the machine.
1774 */
1775 if (blocksize < hblock) {
1776 ext3_msg(sb, KERN_ERR,
1777 "error: fsblocksize %d too small for "
1778 "hardware sectorsize %d", blocksize, hblock);
1779 goto failed_mount;
1780 }
1781
1782 brelse (bh);
1783 if (!sb_set_blocksize(sb, blocksize)) {
1784 ext3_msg(sb, KERN_ERR,
1785 "error: bad blocksize %d", blocksize);
1786 goto out_fail;
1787 }
1788 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1789 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1790 bh = sb_bread(sb, logic_sb_block);
1791 if (!bh) {
1792 ext3_msg(sb, KERN_ERR,
1793 "error: can't read superblock on 2nd try");
1794 goto failed_mount;
1795 }
1796 es = (struct ext3_super_block *)(bh->b_data + offset);
1797 sbi->s_es = es;
1798 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1799 ext3_msg(sb, KERN_ERR,
1800 "error: magic mismatch");
1801 goto failed_mount;
1802 }
1803 }
1804
1805 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1806
1807 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1808 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1809 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1810 } else {
1811 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1812 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1813 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1814 (!is_power_of_2(sbi->s_inode_size)) ||
1815 (sbi->s_inode_size > blocksize)) {
1816 ext3_msg(sb, KERN_ERR,
1817 "error: unsupported inode size: %d",
1818 sbi->s_inode_size);
1819 goto failed_mount;
1820 }
1821 }
1822 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1823 le32_to_cpu(es->s_log_frag_size);
1824 if (blocksize != sbi->s_frag_size) {
1825 ext3_msg(sb, KERN_ERR,
1826 "error: fragsize %lu != blocksize %u (unsupported)",
1827 sbi->s_frag_size, blocksize);
1828 goto failed_mount;
1829 }
1830 sbi->s_frags_per_block = 1;
1831 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1832 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1833 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1834 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1835 goto cantfind_ext3;
1836 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1837 if (sbi->s_inodes_per_block == 0)
1838 goto cantfind_ext3;
1839 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1840 sbi->s_inodes_per_block;
1841 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1842 sbi->s_sbh = bh;
1843 sbi->s_mount_state = le16_to_cpu(es->s_state);
1844 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1845 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1846 for (i=0; i < 4; i++)
1847 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1848 sbi->s_def_hash_version = es->s_def_hash_version;
1849 i = le32_to_cpu(es->s_flags);
1850 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1851 sbi->s_hash_unsigned = 3;
1852 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1853 #ifdef __CHAR_UNSIGNED__
1854 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1855 sbi->s_hash_unsigned = 3;
1856 #else
1857 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1858 #endif
1859 }
1860
1861 if (sbi->s_blocks_per_group > blocksize * 8) {
1862 ext3_msg(sb, KERN_ERR,
1863 "#blocks per group too big: %lu",
1864 sbi->s_blocks_per_group);
1865 goto failed_mount;
1866 }
1867 if (sbi->s_frags_per_group > blocksize * 8) {
1868 ext3_msg(sb, KERN_ERR,
1869 "error: #fragments per group too big: %lu",
1870 sbi->s_frags_per_group);
1871 goto failed_mount;
1872 }
1873 if (sbi->s_inodes_per_group > blocksize * 8) {
1874 ext3_msg(sb, KERN_ERR,
1875 "error: #inodes per group too big: %lu",
1876 sbi->s_inodes_per_group);
1877 goto failed_mount;
1878 }
1879
1880 err = generic_check_addressable(sb->s_blocksize_bits,
1881 le32_to_cpu(es->s_blocks_count));
1882 if (err) {
1883 ext3_msg(sb, KERN_ERR,
1884 "error: filesystem is too large to mount safely");
1885 if (sizeof(sector_t) < 8)
1886 ext3_msg(sb, KERN_ERR,
1887 "error: CONFIG_LBDAF not enabled");
1888 ret = err;
1889 goto failed_mount;
1890 }
1891
1892 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1893 goto cantfind_ext3;
1894 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1895 le32_to_cpu(es->s_first_data_block) - 1)
1896 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1897 db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
1898 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1899 GFP_KERNEL);
1900 if (sbi->s_group_desc == NULL) {
1901 ext3_msg(sb, KERN_ERR,
1902 "error: not enough memory");
1903 ret = -ENOMEM;
1904 goto failed_mount;
1905 }
1906
1907 bgl_lock_init(sbi->s_blockgroup_lock);
1908
1909 for (i = 0; i < db_count; i++) {
1910 block = descriptor_loc(sb, logic_sb_block, i);
1911 sbi->s_group_desc[i] = sb_bread(sb, block);
1912 if (!sbi->s_group_desc[i]) {
1913 ext3_msg(sb, KERN_ERR,
1914 "error: can't read group descriptor %d", i);
1915 db_count = i;
1916 goto failed_mount2;
1917 }
1918 }
1919 if (!ext3_check_descriptors (sb)) {
1920 ext3_msg(sb, KERN_ERR,
1921 "error: group descriptors corrupted");
1922 goto failed_mount2;
1923 }
1924 sbi->s_gdb_count = db_count;
1925 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1926 spin_lock_init(&sbi->s_next_gen_lock);
1927
1928 /* per fileystem reservation list head & lock */
1929 spin_lock_init(&sbi->s_rsv_window_lock);
1930 sbi->s_rsv_window_root = RB_ROOT;
1931 /* Add a single, static dummy reservation to the start of the
1932 * reservation window list --- it gives us a placeholder for
1933 * append-at-start-of-list which makes the allocation logic
1934 * _much_ simpler. */
1935 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1936 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1937 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1938 sbi->s_rsv_window_head.rsv_goal_size = 0;
1939 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1940
1941 /*
1942 * set up enough so that it can read an inode
1943 */
1944 sb->s_op = &ext3_sops;
1945 sb->s_export_op = &ext3_export_ops;
1946 sb->s_xattr = ext3_xattr_handlers;
1947 #ifdef CONFIG_QUOTA
1948 sb->s_qcop = &ext3_qctl_operations;
1949 sb->dq_op = &ext3_quota_operations;
1950 #endif
1951 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
1952 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1953 mutex_init(&sbi->s_orphan_lock);
1954 mutex_init(&sbi->s_resize_lock);
1955
1956 sb->s_root = NULL;
1957
1958 needs_recovery = (es->s_last_orphan != 0 ||
1959 EXT3_HAS_INCOMPAT_FEATURE(sb,
1960 EXT3_FEATURE_INCOMPAT_RECOVER));
1961
1962 /*
1963 * The first inode we look at is the journal inode. Don't try
1964 * root first: it may be modified in the journal!
1965 */
1966 if (!test_opt(sb, NOLOAD) &&
1967 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1968 if (ext3_load_journal(sb, es, journal_devnum))
1969 goto failed_mount2;
1970 } else if (journal_inum) {
1971 if (ext3_create_journal(sb, es, journal_inum))
1972 goto failed_mount2;
1973 } else {
1974 if (!silent)
1975 ext3_msg(sb, KERN_ERR,
1976 "error: no journal found. "
1977 "mounting ext3 over ext2?");
1978 goto failed_mount2;
1979 }
1980 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1981 ext3_count_free_blocks(sb));
1982 if (!err) {
1983 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1984 ext3_count_free_inodes(sb));
1985 }
1986 if (!err) {
1987 err = percpu_counter_init(&sbi->s_dirs_counter,
1988 ext3_count_dirs(sb));
1989 }
1990 if (err) {
1991 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
1992 ret = err;
1993 goto failed_mount3;
1994 }
1995
1996 /* We have now updated the journal if required, so we can
1997 * validate the data journaling mode. */
1998 switch (test_opt(sb, DATA_FLAGS)) {
1999 case 0:
2000 /* No mode set, assume a default based on the journal
2001 capabilities: ORDERED_DATA if the journal can
2002 cope, else JOURNAL_DATA */
2003 if (journal_check_available_features
2004 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
2005 set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
2006 else
2007 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2008 break;
2009
2010 case EXT3_MOUNT_ORDERED_DATA:
2011 case EXT3_MOUNT_WRITEBACK_DATA:
2012 if (!journal_check_available_features
2013 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
2014 ext3_msg(sb, KERN_ERR,
2015 "error: journal does not support "
2016 "requested data journaling mode");
2017 goto failed_mount3;
2018 }
2019 default:
2020 break;
2021 }
2022
2023 /*
2024 * The journal_load will have done any necessary log recovery,
2025 * so we can safely mount the rest of the filesystem now.
2026 */
2027
2028 root = ext3_iget(sb, EXT3_ROOT_INO);
2029 if (IS_ERR(root)) {
2030 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
2031 ret = PTR_ERR(root);
2032 goto failed_mount3;
2033 }
2034 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2035 iput(root);
2036 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
2037 goto failed_mount3;
2038 }
2039 sb->s_root = d_make_root(root);
2040 if (!sb->s_root) {
2041 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
2042 ret = -ENOMEM;
2043 goto failed_mount3;
2044 }
2045
2046 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
2047
2048 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2049 ext3_orphan_cleanup(sb, es);
2050 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2051 if (needs_recovery) {
2052 ext3_mark_recovery_complete(sb, es);
2053 ext3_msg(sb, KERN_INFO, "recovery complete");
2054 }
2055 ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
2056 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2057 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2058 "writeback");
2059
2060 return 0;
2061
2062 cantfind_ext3:
2063 if (!silent)
2064 ext3_msg(sb, KERN_INFO,
2065 "error: can't find ext3 filesystem on dev %s.",
2066 sb->s_id);
2067 goto failed_mount;
2068
2069 failed_mount3:
2070 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2071 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2072 percpu_counter_destroy(&sbi->s_dirs_counter);
2073 journal_destroy(sbi->s_journal);
2074 failed_mount2:
2075 for (i = 0; i < db_count; i++)
2076 brelse(sbi->s_group_desc[i]);
2077 kfree(sbi->s_group_desc);
2078 failed_mount:
2079 #ifdef CONFIG_QUOTA
2080 for (i = 0; i < MAXQUOTAS; i++)
2081 kfree(sbi->s_qf_names[i]);
2082 #endif
2083 ext3_blkdev_remove(sbi);
2084 brelse(bh);
2085 out_fail:
2086 sb->s_fs_info = NULL;
2087 kfree(sbi->s_blockgroup_lock);
2088 kfree(sbi);
2089 return ret;
2090 }
2091
2092 /*
2093 * Setup any per-fs journal parameters now. We'll do this both on
2094 * initial mount, once the journal has been initialised but before we've
2095 * done any recovery; and again on any subsequent remount.
2096 */
2097 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2098 {
2099 struct ext3_sb_info *sbi = EXT3_SB(sb);
2100
2101 if (sbi->s_commit_interval)
2102 journal->j_commit_interval = sbi->s_commit_interval;
2103 /* We could also set up an ext3-specific default for the commit
2104 * interval here, but for now we'll just fall back to the jbd
2105 * default. */
2106
2107 spin_lock(&journal->j_state_lock);
2108 if (test_opt(sb, BARRIER))
2109 journal->j_flags |= JFS_BARRIER;
2110 else
2111 journal->j_flags &= ~JFS_BARRIER;
2112 if (test_opt(sb, DATA_ERR_ABORT))
2113 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2114 else
2115 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2116 spin_unlock(&journal->j_state_lock);
2117 }
2118
2119 static journal_t *ext3_get_journal(struct super_block *sb,
2120 unsigned int journal_inum)
2121 {
2122 struct inode *journal_inode;
2123 journal_t *journal;
2124
2125 /* First, test for the existence of a valid inode on disk. Bad
2126 * things happen if we iget() an unused inode, as the subsequent
2127 * iput() will try to delete it. */
2128
2129 journal_inode = ext3_iget(sb, journal_inum);
2130 if (IS_ERR(journal_inode)) {
2131 ext3_msg(sb, KERN_ERR, "error: no journal found");
2132 return NULL;
2133 }
2134 if (!journal_inode->i_nlink) {
2135 make_bad_inode(journal_inode);
2136 iput(journal_inode);
2137 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
2138 return NULL;
2139 }
2140
2141 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2142 journal_inode, journal_inode->i_size);
2143 if (!S_ISREG(journal_inode->i_mode)) {
2144 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
2145 iput(journal_inode);
2146 return NULL;
2147 }
2148
2149 journal = journal_init_inode(journal_inode);
2150 if (!journal) {
2151 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
2152 iput(journal_inode);
2153 return NULL;
2154 }
2155 journal->j_private = sb;
2156 ext3_init_journal_params(sb, journal);
2157 return journal;
2158 }
2159
2160 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2161 dev_t j_dev)
2162 {
2163 struct buffer_head * bh;
2164 journal_t *journal;
2165 ext3_fsblk_t start;
2166 ext3_fsblk_t len;
2167 int hblock, blocksize;
2168 ext3_fsblk_t sb_block;
2169 unsigned long offset;
2170 struct ext3_super_block * es;
2171 struct block_device *bdev;
2172
2173 bdev = ext3_blkdev_get(j_dev, sb);
2174 if (bdev == NULL)
2175 return NULL;
2176
2177 blocksize = sb->s_blocksize;
2178 hblock = bdev_logical_block_size(bdev);
2179 if (blocksize < hblock) {
2180 ext3_msg(sb, KERN_ERR,
2181 "error: blocksize too small for journal device");
2182 goto out_bdev;
2183 }
2184
2185 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2186 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2187 set_blocksize(bdev, blocksize);
2188 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2189 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2190 "external journal");
2191 goto out_bdev;
2192 }
2193
2194 es = (struct ext3_super_block *) (bh->b_data + offset);
2195 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2196 !(le32_to_cpu(es->s_feature_incompat) &
2197 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2198 ext3_msg(sb, KERN_ERR, "error: external journal has "
2199 "bad superblock");
2200 brelse(bh);
2201 goto out_bdev;
2202 }
2203
2204 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2205 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
2206 brelse(bh);
2207 goto out_bdev;
2208 }
2209
2210 len = le32_to_cpu(es->s_blocks_count);
2211 start = sb_block + 1;
2212 brelse(bh); /* we're done with the superblock */
2213
2214 journal = journal_init_dev(bdev, sb->s_bdev,
2215 start, len, blocksize);
2216 if (!journal) {
2217 ext3_msg(sb, KERN_ERR,
2218 "error: failed to create device journal");
2219 goto out_bdev;
2220 }
2221 journal->j_private = sb;
2222 if (!bh_uptodate_or_lock(journal->j_sb_buffer)) {
2223 if (bh_submit_read(journal->j_sb_buffer)) {
2224 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2225 goto out_journal;
2226 }
2227 }
2228 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2229 ext3_msg(sb, KERN_ERR,
2230 "error: external journal has more than one "
2231 "user (unsupported) - %d",
2232 be32_to_cpu(journal->j_superblock->s_nr_users));
2233 goto out_journal;
2234 }
2235 EXT3_SB(sb)->journal_bdev = bdev;
2236 ext3_init_journal_params(sb, journal);
2237 return journal;
2238 out_journal:
2239 journal_destroy(journal);
2240 out_bdev:
2241 ext3_blkdev_put(bdev);
2242 return NULL;
2243 }
2244
2245 static int ext3_load_journal(struct super_block *sb,
2246 struct ext3_super_block *es,
2247 unsigned long journal_devnum)
2248 {
2249 journal_t *journal;
2250 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2251 dev_t journal_dev;
2252 int err = 0;
2253 int really_read_only;
2254
2255 if (journal_devnum &&
2256 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2257 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2258 "numbers have changed");
2259 journal_dev = new_decode_dev(journal_devnum);
2260 } else
2261 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2262
2263 really_read_only = bdev_read_only(sb->s_bdev);
2264
2265 /*
2266 * Are we loading a blank journal or performing recovery after a
2267 * crash? For recovery, we need to check in advance whether we
2268 * can get read-write access to the device.
2269 */
2270
2271 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2272 if (sb->s_flags & MS_RDONLY) {
2273 ext3_msg(sb, KERN_INFO,
2274 "recovery required on readonly filesystem");
2275 if (really_read_only) {
2276 ext3_msg(sb, KERN_ERR, "error: write access "
2277 "unavailable, cannot proceed");
2278 return -EROFS;
2279 }
2280 ext3_msg(sb, KERN_INFO,
2281 "write access will be enabled during recovery");
2282 }
2283 }
2284
2285 if (journal_inum && journal_dev) {
2286 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2287 "and inode journals");
2288 return -EINVAL;
2289 }
2290
2291 if (journal_inum) {
2292 if (!(journal = ext3_get_journal(sb, journal_inum)))
2293 return -EINVAL;
2294 } else {
2295 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2296 return -EINVAL;
2297 }
2298
2299 if (!(journal->j_flags & JFS_BARRIER))
2300 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2301
2302 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2303 err = journal_update_format(journal);
2304 if (err) {
2305 ext3_msg(sb, KERN_ERR, "error updating journal");
2306 journal_destroy(journal);
2307 return err;
2308 }
2309 }
2310
2311 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2312 err = journal_wipe(journal, !really_read_only);
2313 if (!err)
2314 err = journal_load(journal);
2315
2316 if (err) {
2317 ext3_msg(sb, KERN_ERR, "error loading journal");
2318 journal_destroy(journal);
2319 return err;
2320 }
2321
2322 EXT3_SB(sb)->s_journal = journal;
2323 ext3_clear_journal_err(sb, es);
2324
2325 if (!really_read_only && journal_devnum &&
2326 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2327 es->s_journal_dev = cpu_to_le32(journal_devnum);
2328
2329 /* Make sure we flush the recovery flag to disk. */
2330 ext3_commit_super(sb, es, 1);
2331 }
2332
2333 return 0;
2334 }
2335
2336 static int ext3_create_journal(struct super_block *sb,
2337 struct ext3_super_block *es,
2338 unsigned int journal_inum)
2339 {
2340 journal_t *journal;
2341 int err;
2342
2343 if (sb->s_flags & MS_RDONLY) {
2344 ext3_msg(sb, KERN_ERR,
2345 "error: readonly filesystem when trying to "
2346 "create journal");
2347 return -EROFS;
2348 }
2349
2350 journal = ext3_get_journal(sb, journal_inum);
2351 if (!journal)
2352 return -EINVAL;
2353
2354 ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
2355 journal_inum);
2356
2357 err = journal_create(journal);
2358 if (err) {
2359 ext3_msg(sb, KERN_ERR, "error creating journal");
2360 journal_destroy(journal);
2361 return -EIO;
2362 }
2363
2364 EXT3_SB(sb)->s_journal = journal;
2365
2366 ext3_update_dynamic_rev(sb);
2367 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2368 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2369
2370 es->s_journal_inum = cpu_to_le32(journal_inum);
2371
2372 /* Make sure we flush the recovery flag to disk. */
2373 ext3_commit_super(sb, es, 1);
2374
2375 return 0;
2376 }
2377
2378 static int ext3_commit_super(struct super_block *sb,
2379 struct ext3_super_block *es,
2380 int sync)
2381 {
2382 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2383 int error = 0;
2384
2385 if (!sbh)
2386 return error;
2387
2388 if (buffer_write_io_error(sbh)) {
2389 /*
2390 * Oh, dear. A previous attempt to write the
2391 * superblock failed. This could happen because the
2392 * USB device was yanked out. Or it could happen to
2393 * be a transient write error and maybe the block will
2394 * be remapped. Nothing we can do but to retry the
2395 * write and hope for the best.
2396 */
2397 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2398 "superblock detected");
2399 clear_buffer_write_io_error(sbh);
2400 set_buffer_uptodate(sbh);
2401 }
2402 /*
2403 * If the file system is mounted read-only, don't update the
2404 * superblock write time. This avoids updating the superblock
2405 * write time when we are mounting the root file system
2406 * read/only but we need to replay the journal; at that point,
2407 * for people who are east of GMT and who make their clock
2408 * tick in localtime for Windows bug-for-bug compatibility,
2409 * the clock is set in the future, and this will cause e2fsck
2410 * to complain and force a full file system check.
2411 */
2412 if (!(sb->s_flags & MS_RDONLY))
2413 es->s_wtime = cpu_to_le32(get_seconds());
2414 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2415 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2416 BUFFER_TRACE(sbh, "marking dirty");
2417 mark_buffer_dirty(sbh);
2418 if (sync) {
2419 error = sync_dirty_buffer(sbh);
2420 if (buffer_write_io_error(sbh)) {
2421 ext3_msg(sb, KERN_ERR, "I/O error while writing "
2422 "superblock");
2423 clear_buffer_write_io_error(sbh);
2424 set_buffer_uptodate(sbh);
2425 }
2426 }
2427 return error;
2428 }
2429
2430
2431 /*
2432 * Have we just finished recovery? If so, and if we are mounting (or
2433 * remounting) the filesystem readonly, then we will end up with a
2434 * consistent fs on disk. Record that fact.
2435 */
2436 static void ext3_mark_recovery_complete(struct super_block * sb,
2437 struct ext3_super_block * es)
2438 {
2439 journal_t *journal = EXT3_SB(sb)->s_journal;
2440
2441 journal_lock_updates(journal);
2442 if (journal_flush(journal) < 0)
2443 goto out;
2444
2445 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2446 sb->s_flags & MS_RDONLY) {
2447 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2448 ext3_commit_super(sb, es, 1);
2449 }
2450
2451 out:
2452 journal_unlock_updates(journal);
2453 }
2454
2455 /*
2456 * If we are mounting (or read-write remounting) a filesystem whose journal
2457 * has recorded an error from a previous lifetime, move that error to the
2458 * main filesystem now.
2459 */
2460 static void ext3_clear_journal_err(struct super_block *sb,
2461 struct ext3_super_block *es)
2462 {
2463 journal_t *journal;
2464 int j_errno;
2465 const char *errstr;
2466
2467 journal = EXT3_SB(sb)->s_journal;
2468
2469 /*
2470 * Now check for any error status which may have been recorded in the
2471 * journal by a prior ext3_error() or ext3_abort()
2472 */
2473
2474 j_errno = journal_errno(journal);
2475 if (j_errno) {
2476 char nbuf[16];
2477
2478 errstr = ext3_decode_error(sb, j_errno, nbuf);
2479 ext3_warning(sb, __func__, "Filesystem error recorded "
2480 "from previous mount: %s", errstr);
2481 ext3_warning(sb, __func__, "Marking fs in need of "
2482 "filesystem check.");
2483
2484 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2485 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2486 ext3_commit_super (sb, es, 1);
2487
2488 journal_clear_err(journal);
2489 }
2490 }
2491
2492 /*
2493 * Force the running and committing transactions to commit,
2494 * and wait on the commit.
2495 */
2496 int ext3_force_commit(struct super_block *sb)
2497 {
2498 journal_t *journal;
2499 int ret;
2500
2501 if (sb->s_flags & MS_RDONLY)
2502 return 0;
2503
2504 journal = EXT3_SB(sb)->s_journal;
2505 ret = ext3_journal_force_commit(journal);
2506 return ret;
2507 }
2508
2509 static int ext3_sync_fs(struct super_block *sb, int wait)
2510 {
2511 tid_t target;
2512
2513 trace_ext3_sync_fs(sb, wait);
2514 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2515 if (wait)
2516 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2517 }
2518 return 0;
2519 }
2520
2521 /*
2522 * LVM calls this function before a (read-only) snapshot is created. This
2523 * gives us a chance to flush the journal completely and mark the fs clean.
2524 */
2525 static int ext3_freeze(struct super_block *sb)
2526 {
2527 int error = 0;
2528 journal_t *journal;
2529
2530 if (!(sb->s_flags & MS_RDONLY)) {
2531 journal = EXT3_SB(sb)->s_journal;
2532
2533 /* Now we set up the journal barrier. */
2534 journal_lock_updates(journal);
2535
2536 /*
2537 * We don't want to clear needs_recovery flag when we failed
2538 * to flush the journal.
2539 */
2540 error = journal_flush(journal);
2541 if (error < 0)
2542 goto out;
2543
2544 /* Journal blocked and flushed, clear needs_recovery flag. */
2545 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2546 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2547 if (error)
2548 goto out;
2549 }
2550 return 0;
2551
2552 out:
2553 journal_unlock_updates(journal);
2554 return error;
2555 }
2556
2557 /*
2558 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2559 * flag here, even though the filesystem is not technically dirty yet.
2560 */
2561 static int ext3_unfreeze(struct super_block *sb)
2562 {
2563 if (!(sb->s_flags & MS_RDONLY)) {
2564 lock_super(sb);
2565 /* Reser the needs_recovery flag before the fs is unlocked. */
2566 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2567 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2568 unlock_super(sb);
2569 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2570 }
2571 return 0;
2572 }
2573
2574 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2575 {
2576 struct ext3_super_block * es;
2577 struct ext3_sb_info *sbi = EXT3_SB(sb);
2578 ext3_fsblk_t n_blocks_count = 0;
2579 unsigned long old_sb_flags;
2580 struct ext3_mount_options old_opts;
2581 int enable_quota = 0;
2582 int err;
2583 #ifdef CONFIG_QUOTA
2584 int i;
2585 #endif
2586
2587 /* Store the original options */
2588 lock_super(sb);
2589 old_sb_flags = sb->s_flags;
2590 old_opts.s_mount_opt = sbi->s_mount_opt;
2591 old_opts.s_resuid = sbi->s_resuid;
2592 old_opts.s_resgid = sbi->s_resgid;
2593 old_opts.s_commit_interval = sbi->s_commit_interval;
2594 #ifdef CONFIG_QUOTA
2595 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2596 for (i = 0; i < MAXQUOTAS; i++)
2597 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2598 #endif
2599
2600 /*
2601 * Allow the "check" option to be passed as a remount option.
2602 */
2603 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2604 err = -EINVAL;
2605 goto restore_opts;
2606 }
2607
2608 if (test_opt(sb, ABORT))
2609 ext3_abort(sb, __func__, "Abort forced by user");
2610
2611 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2612 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2613
2614 es = sbi->s_es;
2615
2616 ext3_init_journal_params(sb, sbi->s_journal);
2617
2618 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2619 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2620 if (test_opt(sb, ABORT)) {
2621 err = -EROFS;
2622 goto restore_opts;
2623 }
2624
2625 if (*flags & MS_RDONLY) {
2626 err = dquot_suspend(sb, -1);
2627 if (err < 0)
2628 goto restore_opts;
2629
2630 /*
2631 * First of all, the unconditional stuff we have to do
2632 * to disable replay of the journal when we next remount
2633 */
2634 sb->s_flags |= MS_RDONLY;
2635
2636 /*
2637 * OK, test if we are remounting a valid rw partition
2638 * readonly, and if so set the rdonly flag and then
2639 * mark the partition as valid again.
2640 */
2641 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2642 (sbi->s_mount_state & EXT3_VALID_FS))
2643 es->s_state = cpu_to_le16(sbi->s_mount_state);
2644
2645 ext3_mark_recovery_complete(sb, es);
2646 } else {
2647 __le32 ret;
2648 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2649 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2650 ext3_msg(sb, KERN_WARNING,
2651 "warning: couldn't remount RDWR "
2652 "because of unsupported optional "
2653 "features (%x)", le32_to_cpu(ret));
2654 err = -EROFS;
2655 goto restore_opts;
2656 }
2657
2658 /*
2659 * If we have an unprocessed orphan list hanging
2660 * around from a previously readonly bdev mount,
2661 * require a full umount & mount for now.
2662 */
2663 if (es->s_last_orphan) {
2664 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
2665 "remount RDWR because of unprocessed "
2666 "orphan inode list. Please "
2667 "umount & mount instead.");
2668 err = -EINVAL;
2669 goto restore_opts;
2670 }
2671
2672 /*
2673 * Mounting a RDONLY partition read-write, so reread
2674 * and store the current valid flag. (It may have
2675 * been changed by e2fsck since we originally mounted
2676 * the partition.)
2677 */
2678 ext3_clear_journal_err(sb, es);
2679 sbi->s_mount_state = le16_to_cpu(es->s_state);
2680 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2681 goto restore_opts;
2682 if (!ext3_setup_super (sb, es, 0))
2683 sb->s_flags &= ~MS_RDONLY;
2684 enable_quota = 1;
2685 }
2686 }
2687 #ifdef CONFIG_QUOTA
2688 /* Release old quota file names */
2689 for (i = 0; i < MAXQUOTAS; i++)
2690 if (old_opts.s_qf_names[i] &&
2691 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2692 kfree(old_opts.s_qf_names[i]);
2693 #endif
2694 unlock_super(sb);
2695
2696 if (enable_quota)
2697 dquot_resume(sb, -1);
2698 return 0;
2699 restore_opts:
2700 sb->s_flags = old_sb_flags;
2701 sbi->s_mount_opt = old_opts.s_mount_opt;
2702 sbi->s_resuid = old_opts.s_resuid;
2703 sbi->s_resgid = old_opts.s_resgid;
2704 sbi->s_commit_interval = old_opts.s_commit_interval;
2705 #ifdef CONFIG_QUOTA
2706 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2707 for (i = 0; i < MAXQUOTAS; i++) {
2708 if (sbi->s_qf_names[i] &&
2709 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2710 kfree(sbi->s_qf_names[i]);
2711 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2712 }
2713 #endif
2714 unlock_super(sb);
2715 return err;
2716 }
2717
2718 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2719 {
2720 struct super_block *sb = dentry->d_sb;
2721 struct ext3_sb_info *sbi = EXT3_SB(sb);
2722 struct ext3_super_block *es = sbi->s_es;
2723 u64 fsid;
2724
2725 if (test_opt(sb, MINIX_DF)) {
2726 sbi->s_overhead_last = 0;
2727 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2728 unsigned long ngroups = sbi->s_groups_count, i;
2729 ext3_fsblk_t overhead = 0;
2730 smp_rmb();
2731
2732 /*
2733 * Compute the overhead (FS structures). This is constant
2734 * for a given filesystem unless the number of block groups
2735 * changes so we cache the previous value until it does.
2736 */
2737
2738 /*
2739 * All of the blocks before first_data_block are
2740 * overhead
2741 */
2742 overhead = le32_to_cpu(es->s_first_data_block);
2743
2744 /*
2745 * Add the overhead attributed to the superblock and
2746 * block group descriptors. If the sparse superblocks
2747 * feature is turned on, then not all groups have this.
2748 */
2749 for (i = 0; i < ngroups; i++) {
2750 overhead += ext3_bg_has_super(sb, i) +
2751 ext3_bg_num_gdb(sb, i);
2752 cond_resched();
2753 }
2754
2755 /*
2756 * Every block group has an inode bitmap, a block
2757 * bitmap, and an inode table.
2758 */
2759 overhead += ngroups * (2 + sbi->s_itb_per_group);
2760 sbi->s_overhead_last = overhead;
2761 smp_wmb();
2762 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2763 }
2764
2765 buf->f_type = EXT3_SUPER_MAGIC;
2766 buf->f_bsize = sb->s_blocksize;
2767 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2768 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2769 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2770 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2771 buf->f_bavail = 0;
2772 buf->f_files = le32_to_cpu(es->s_inodes_count);
2773 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2774 buf->f_namelen = EXT3_NAME_LEN;
2775 fsid = le64_to_cpup((void *)es->s_uuid) ^
2776 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2777 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2778 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2779 return 0;
2780 }
2781
2782 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2783 * is locked for write. Otherwise the are possible deadlocks:
2784 * Process 1 Process 2
2785 * ext3_create() quota_sync()
2786 * journal_start() write_dquot()
2787 * dquot_initialize() down(dqio_mutex)
2788 * down(dqio_mutex) journal_start()
2789 *
2790 */
2791
2792 #ifdef CONFIG_QUOTA
2793
2794 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2795 {
2796 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2797 }
2798
2799 static int ext3_write_dquot(struct dquot *dquot)
2800 {
2801 int ret, err;
2802 handle_t *handle;
2803 struct inode *inode;
2804
2805 inode = dquot_to_inode(dquot);
2806 handle = ext3_journal_start(inode,
2807 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2808 if (IS_ERR(handle))
2809 return PTR_ERR(handle);
2810 ret = dquot_commit(dquot);
2811 err = ext3_journal_stop(handle);
2812 if (!ret)
2813 ret = err;
2814 return ret;
2815 }
2816
2817 static int ext3_acquire_dquot(struct dquot *dquot)
2818 {
2819 int ret, err;
2820 handle_t *handle;
2821
2822 handle = ext3_journal_start(dquot_to_inode(dquot),
2823 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2824 if (IS_ERR(handle))
2825 return PTR_ERR(handle);
2826 ret = dquot_acquire(dquot);
2827 err = ext3_journal_stop(handle);
2828 if (!ret)
2829 ret = err;
2830 return ret;
2831 }
2832
2833 static int ext3_release_dquot(struct dquot *dquot)
2834 {
2835 int ret, err;
2836 handle_t *handle;
2837
2838 handle = ext3_journal_start(dquot_to_inode(dquot),
2839 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2840 if (IS_ERR(handle)) {
2841 /* Release dquot anyway to avoid endless cycle in dqput() */
2842 dquot_release(dquot);
2843 return PTR_ERR(handle);
2844 }
2845 ret = dquot_release(dquot);
2846 err = ext3_journal_stop(handle);
2847 if (!ret)
2848 ret = err;
2849 return ret;
2850 }
2851
2852 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2853 {
2854 /* Are we journaling quotas? */
2855 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2856 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2857 dquot_mark_dquot_dirty(dquot);
2858 return ext3_write_dquot(dquot);
2859 } else {
2860 return dquot_mark_dquot_dirty(dquot);
2861 }
2862 }
2863
2864 static int ext3_write_info(struct super_block *sb, int type)
2865 {
2866 int ret, err;
2867 handle_t *handle;
2868
2869 /* Data block + inode block */
2870 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2871 if (IS_ERR(handle))
2872 return PTR_ERR(handle);
2873 ret = dquot_commit_info(sb, type);
2874 err = ext3_journal_stop(handle);
2875 if (!ret)
2876 ret = err;
2877 return ret;
2878 }
2879
2880 /*
2881 * Turn on quotas during mount time - we need to find
2882 * the quota file and such...
2883 */
2884 static int ext3_quota_on_mount(struct super_block *sb, int type)
2885 {
2886 return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2887 EXT3_SB(sb)->s_jquota_fmt, type);
2888 }
2889
2890 /*
2891 * Standard function to be called on quota_on
2892 */
2893 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2894 struct path *path)
2895 {
2896 int err;
2897
2898 if (!test_opt(sb, QUOTA))
2899 return -EINVAL;
2900
2901 /* Quotafile not on the same filesystem? */
2902 if (path->dentry->d_sb != sb)
2903 return -EXDEV;
2904 /* Journaling quota? */
2905 if (EXT3_SB(sb)->s_qf_names[type]) {
2906 /* Quotafile not of fs root? */
2907 if (path->dentry->d_parent != sb->s_root)
2908 ext3_msg(sb, KERN_WARNING,
2909 "warning: Quota file not on filesystem root. "
2910 "Journaled quota will not work.");
2911 }
2912
2913 /*
2914 * When we journal data on quota file, we have to flush journal to see
2915 * all updates to the file when we bypass pagecache...
2916 */
2917 if (ext3_should_journal_data(path->dentry->d_inode)) {
2918 /*
2919 * We don't need to lock updates but journal_flush() could
2920 * otherwise be livelocked...
2921 */
2922 journal_lock_updates(EXT3_SB(sb)->s_journal);
2923 err = journal_flush(EXT3_SB(sb)->s_journal);
2924 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2925 if (err)
2926 return err;
2927 }
2928
2929 return dquot_quota_on(sb, type, format_id, path);
2930 }
2931
2932 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2933 * acquiring the locks... As quota files are never truncated and quota code
2934 * itself serializes the operations (and no one else should touch the files)
2935 * we don't have to be afraid of races */
2936 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2937 size_t len, loff_t off)
2938 {
2939 struct inode *inode = sb_dqopt(sb)->files[type];
2940 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2941 int err = 0;
2942 int offset = off & (sb->s_blocksize - 1);
2943 int tocopy;
2944 size_t toread;
2945 struct buffer_head *bh;
2946 loff_t i_size = i_size_read(inode);
2947
2948 if (off > i_size)
2949 return 0;
2950 if (off+len > i_size)
2951 len = i_size-off;
2952 toread = len;
2953 while (toread > 0) {
2954 tocopy = sb->s_blocksize - offset < toread ?
2955 sb->s_blocksize - offset : toread;
2956 bh = ext3_bread(NULL, inode, blk, 0, &err);
2957 if (err)
2958 return err;
2959 if (!bh) /* A hole? */
2960 memset(data, 0, tocopy);
2961 else
2962 memcpy(data, bh->b_data+offset, tocopy);
2963 brelse(bh);
2964 offset = 0;
2965 toread -= tocopy;
2966 data += tocopy;
2967 blk++;
2968 }
2969 return len;
2970 }
2971
2972 /* Write to quotafile (we know the transaction is already started and has
2973 * enough credits) */
2974 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2975 const char *data, size_t len, loff_t off)
2976 {
2977 struct inode *inode = sb_dqopt(sb)->files[type];
2978 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2979 int err = 0;
2980 int offset = off & (sb->s_blocksize - 1);
2981 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2982 struct buffer_head *bh;
2983 handle_t *handle = journal_current_handle();
2984
2985 if (!handle) {
2986 ext3_msg(sb, KERN_WARNING,
2987 "warning: quota write (off=%llu, len=%llu)"
2988 " cancelled because transaction is not started.",
2989 (unsigned long long)off, (unsigned long long)len);
2990 return -EIO;
2991 }
2992
2993 /*
2994 * Since we account only one data block in transaction credits,
2995 * then it is impossible to cross a block boundary.
2996 */
2997 if (sb->s_blocksize - offset < len) {
2998 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
2999 " cancelled because not block aligned",
3000 (unsigned long long)off, (unsigned long long)len);
3001 return -EIO;
3002 }
3003 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3004 bh = ext3_bread(handle, inode, blk, 1, &err);
3005 if (!bh)
3006 goto out;
3007 if (journal_quota) {
3008 err = ext3_journal_get_write_access(handle, bh);
3009 if (err) {
3010 brelse(bh);
3011 goto out;
3012 }
3013 }
3014 lock_buffer(bh);
3015 memcpy(bh->b_data+offset, data, len);
3016 flush_dcache_page(bh->b_page);
3017 unlock_buffer(bh);
3018 if (journal_quota)
3019 err = ext3_journal_dirty_metadata(handle, bh);
3020 else {
3021 /* Always do at least ordered writes for quotas */
3022 err = ext3_journal_dirty_data(handle, bh);
3023 mark_buffer_dirty(bh);
3024 }
3025 brelse(bh);
3026 out:
3027 if (err) {
3028 mutex_unlock(&inode->i_mutex);
3029 return err;
3030 }
3031 if (inode->i_size < off + len) {
3032 i_size_write(inode, off + len);
3033 EXT3_I(inode)->i_disksize = inode->i_size;
3034 }
3035 inode->i_version++;
3036 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3037 ext3_mark_inode_dirty(handle, inode);
3038 mutex_unlock(&inode->i_mutex);
3039 return len;
3040 }
3041
3042 #endif
3043
3044 static struct dentry *ext3_mount(struct file_system_type *fs_type,
3045 int flags, const char *dev_name, void *data)
3046 {
3047 return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
3048 }
3049
3050 static struct file_system_type ext3_fs_type = {
3051 .owner = THIS_MODULE,
3052 .name = "ext3",
3053 .mount = ext3_mount,
3054 .kill_sb = kill_block_super,
3055 .fs_flags = FS_REQUIRES_DEV,
3056 };
3057
3058 static int __init init_ext3_fs(void)
3059 {
3060 int err = init_ext3_xattr();
3061 if (err)
3062 return err;
3063 err = init_inodecache();
3064 if (err)
3065 goto out1;
3066 err = register_filesystem(&ext3_fs_type);
3067 if (err)
3068 goto out;
3069 return 0;
3070 out:
3071 destroy_inodecache();
3072 out1:
3073 exit_ext3_xattr();
3074 return err;
3075 }
3076
3077 static void __exit exit_ext3_fs(void)
3078 {
3079 unregister_filesystem(&ext3_fs_type);
3080 destroy_inodecache();
3081 exit_ext3_xattr();
3082 }
3083
3084 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3085 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3086 MODULE_LICENSE("GPL");
3087 module_init(init_ext3_fs)
3088 module_exit(exit_ext3_fs)
Linux with added FPC-III support