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Merge branch 'for-linus' into for-next
[deliverable/linux.git] / fs / ext3 / super.c
1 /*
2 * linux/fs/ext3/super.c
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19 #include <linux/module.h>
20 #include <linux/blkdev.h>
21 #include <linux/parser.h>
22 #include <linux/exportfs.h>
23 #include <linux/statfs.h>
24 #include <linux/random.h>
25 #include <linux/mount.h>
26 #include <linux/quotaops.h>
27 #include <linux/seq_file.h>
28 #include <linux/log2.h>
29 #include <linux/cleancache.h>
30
31 #include <asm/uaccess.h>
32
33 #define CREATE_TRACE_POINTS
34
35 #include "ext3.h"
36 #include "xattr.h"
37 #include "acl.h"
38 #include "namei.h"
39
40 #ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
41 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
42 #else
43 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
44 #endif
45
46 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
47 unsigned long journal_devnum);
48 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
49 unsigned int);
50 static int ext3_commit_super(struct super_block *sb,
51 struct ext3_super_block *es,
52 int sync);
53 static void ext3_mark_recovery_complete(struct super_block * sb,
54 struct ext3_super_block * es);
55 static void ext3_clear_journal_err(struct super_block * sb,
56 struct ext3_super_block * es);
57 static int ext3_sync_fs(struct super_block *sb, int wait);
58 static const char *ext3_decode_error(struct super_block * sb, int errno,
59 char nbuf[16]);
60 static int ext3_remount (struct super_block * sb, int * flags, char * data);
61 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
62 static int ext3_unfreeze(struct super_block *sb);
63 static int ext3_freeze(struct super_block *sb);
64
65 /*
66 * Wrappers for journal_start/end.
67 */
68 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
69 {
70 journal_t *journal;
71
72 if (sb->s_flags & MS_RDONLY)
73 return ERR_PTR(-EROFS);
74
75 /* Special case here: if the journal has aborted behind our
76 * backs (eg. EIO in the commit thread), then we still need to
77 * take the FS itself readonly cleanly. */
78 journal = EXT3_SB(sb)->s_journal;
79 if (is_journal_aborted(journal)) {
80 ext3_abort(sb, __func__,
81 "Detected aborted journal");
82 return ERR_PTR(-EROFS);
83 }
84
85 return journal_start(journal, nblocks);
86 }
87
88 int __ext3_journal_stop(const char *where, handle_t *handle)
89 {
90 struct super_block *sb;
91 int err;
92 int rc;
93
94 sb = handle->h_transaction->t_journal->j_private;
95 err = handle->h_err;
96 rc = journal_stop(handle);
97
98 if (!err)
99 err = rc;
100 if (err)
101 __ext3_std_error(sb, where, err);
102 return err;
103 }
104
105 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
106 struct buffer_head *bh, handle_t *handle, int err)
107 {
108 char nbuf[16];
109 const char *errstr = ext3_decode_error(NULL, err, nbuf);
110
111 if (bh)
112 BUFFER_TRACE(bh, "abort");
113
114 if (!handle->h_err)
115 handle->h_err = err;
116
117 if (is_handle_aborted(handle))
118 return;
119
120 printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
121 caller, errstr, err_fn);
122
123 journal_abort_handle(handle);
124 }
125
126 void ext3_msg(struct super_block *sb, const char *prefix,
127 const char *fmt, ...)
128 {
129 struct va_format vaf;
130 va_list args;
131
132 va_start(args, fmt);
133
134 vaf.fmt = fmt;
135 vaf.va = &args;
136
137 printk("%sEXT3-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
138
139 va_end(args);
140 }
141
142 /* Deal with the reporting of failure conditions on a filesystem such as
143 * inconsistencies detected or read IO failures.
144 *
145 * On ext2, we can store the error state of the filesystem in the
146 * superblock. That is not possible on ext3, because we may have other
147 * write ordering constraints on the superblock which prevent us from
148 * writing it out straight away; and given that the journal is about to
149 * be aborted, we can't rely on the current, or future, transactions to
150 * write out the superblock safely.
151 *
152 * We'll just use the journal_abort() error code to record an error in
153 * the journal instead. On recovery, the journal will complain about
154 * that error until we've noted it down and cleared it.
155 */
156
157 static void ext3_handle_error(struct super_block *sb)
158 {
159 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
160
161 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
162 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
163
164 if (sb->s_flags & MS_RDONLY)
165 return;
166
167 if (!test_opt (sb, ERRORS_CONT)) {
168 journal_t *journal = EXT3_SB(sb)->s_journal;
169
170 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
171 if (journal)
172 journal_abort(journal, -EIO);
173 }
174 if (test_opt (sb, ERRORS_RO)) {
175 ext3_msg(sb, KERN_CRIT,
176 "error: remounting filesystem read-only");
177 sb->s_flags |= MS_RDONLY;
178 }
179 ext3_commit_super(sb, es, 1);
180 if (test_opt(sb, ERRORS_PANIC))
181 panic("EXT3-fs (%s): panic forced after error\n",
182 sb->s_id);
183 }
184
185 void ext3_error(struct super_block *sb, const char *function,
186 const char *fmt, ...)
187 {
188 struct va_format vaf;
189 va_list args;
190
191 va_start(args, fmt);
192
193 vaf.fmt = fmt;
194 vaf.va = &args;
195
196 printk(KERN_CRIT "EXT3-fs error (device %s): %s: %pV\n",
197 sb->s_id, function, &vaf);
198
199 va_end(args);
200
201 ext3_handle_error(sb);
202 }
203
204 static const char *ext3_decode_error(struct super_block * sb, int errno,
205 char nbuf[16])
206 {
207 char *errstr = NULL;
208
209 switch (errno) {
210 case -EIO:
211 errstr = "IO failure";
212 break;
213 case -ENOMEM:
214 errstr = "Out of memory";
215 break;
216 case -EROFS:
217 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
218 errstr = "Journal has aborted";
219 else
220 errstr = "Readonly filesystem";
221 break;
222 default:
223 /* If the caller passed in an extra buffer for unknown
224 * errors, textualise them now. Else we just return
225 * NULL. */
226 if (nbuf) {
227 /* Check for truncated error codes... */
228 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
229 errstr = nbuf;
230 }
231 break;
232 }
233
234 return errstr;
235 }
236
237 /* __ext3_std_error decodes expected errors from journaling functions
238 * automatically and invokes the appropriate error response. */
239
240 void __ext3_std_error (struct super_block * sb, const char * function,
241 int errno)
242 {
243 char nbuf[16];
244 const char *errstr;
245
246 /* Special case: if the error is EROFS, and we're not already
247 * inside a transaction, then there's really no point in logging
248 * an error. */
249 if (errno == -EROFS && journal_current_handle() == NULL &&
250 (sb->s_flags & MS_RDONLY))
251 return;
252
253 errstr = ext3_decode_error(sb, errno, nbuf);
254 ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
255
256 ext3_handle_error(sb);
257 }
258
259 /*
260 * ext3_abort is a much stronger failure handler than ext3_error. The
261 * abort function may be used to deal with unrecoverable failures such
262 * as journal IO errors or ENOMEM at a critical moment in log management.
263 *
264 * We unconditionally force the filesystem into an ABORT|READONLY state,
265 * unless the error response on the fs has been set to panic in which
266 * case we take the easy way out and panic immediately.
267 */
268
269 void ext3_abort(struct super_block *sb, const char *function,
270 const char *fmt, ...)
271 {
272 struct va_format vaf;
273 va_list args;
274
275 va_start(args, fmt);
276
277 vaf.fmt = fmt;
278 vaf.va = &args;
279
280 printk(KERN_CRIT "EXT3-fs (%s): error: %s: %pV\n",
281 sb->s_id, function, &vaf);
282
283 va_end(args);
284
285 if (test_opt(sb, ERRORS_PANIC))
286 panic("EXT3-fs: panic from previous error\n");
287
288 if (sb->s_flags & MS_RDONLY)
289 return;
290
291 ext3_msg(sb, KERN_CRIT,
292 "error: remounting filesystem read-only");
293 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
294 sb->s_flags |= MS_RDONLY;
295 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
296 if (EXT3_SB(sb)->s_journal)
297 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
298 }
299
300 void ext3_warning(struct super_block *sb, const char *function,
301 const char *fmt, ...)
302 {
303 struct va_format vaf;
304 va_list args;
305
306 va_start(args, fmt);
307
308 vaf.fmt = fmt;
309 vaf.va = &args;
310
311 printk(KERN_WARNING "EXT3-fs (%s): warning: %s: %pV\n",
312 sb->s_id, function, &vaf);
313
314 va_end(args);
315 }
316
317 void ext3_update_dynamic_rev(struct super_block *sb)
318 {
319 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
320
321 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
322 return;
323
324 ext3_msg(sb, KERN_WARNING,
325 "warning: updating to rev %d because of "
326 "new feature flag, running e2fsck is recommended",
327 EXT3_DYNAMIC_REV);
328
329 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
330 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
331 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
332 /* leave es->s_feature_*compat flags alone */
333 /* es->s_uuid will be set by e2fsck if empty */
334
335 /*
336 * The rest of the superblock fields should be zero, and if not it
337 * means they are likely already in use, so leave them alone. We
338 * can leave it up to e2fsck to clean up any inconsistencies there.
339 */
340 }
341
342 /*
343 * Open the external journal device
344 */
345 static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
346 {
347 struct block_device *bdev;
348 char b[BDEVNAME_SIZE];
349
350 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
351 if (IS_ERR(bdev))
352 goto fail;
353 return bdev;
354
355 fail:
356 ext3_msg(sb, "error: failed to open journal device %s: %ld",
357 __bdevname(dev, b), PTR_ERR(bdev));
358
359 return NULL;
360 }
361
362 /*
363 * Release the journal device
364 */
365 static int ext3_blkdev_put(struct block_device *bdev)
366 {
367 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
368 }
369
370 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
371 {
372 struct block_device *bdev;
373 int ret = -ENODEV;
374
375 bdev = sbi->journal_bdev;
376 if (bdev) {
377 ret = ext3_blkdev_put(bdev);
378 sbi->journal_bdev = NULL;
379 }
380 return ret;
381 }
382
383 static inline struct inode *orphan_list_entry(struct list_head *l)
384 {
385 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
386 }
387
388 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
389 {
390 struct list_head *l;
391
392 ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
393 le32_to_cpu(sbi->s_es->s_last_orphan));
394
395 ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
396 list_for_each(l, &sbi->s_orphan) {
397 struct inode *inode = orphan_list_entry(l);
398 ext3_msg(sb, KERN_ERR, " "
399 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
400 inode->i_sb->s_id, inode->i_ino, inode,
401 inode->i_mode, inode->i_nlink,
402 NEXT_ORPHAN(inode));
403 }
404 }
405
406 static void ext3_put_super (struct super_block * sb)
407 {
408 struct ext3_sb_info *sbi = EXT3_SB(sb);
409 struct ext3_super_block *es = sbi->s_es;
410 int i, err;
411
412 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
413 ext3_xattr_put_super(sb);
414 err = journal_destroy(sbi->s_journal);
415 sbi->s_journal = NULL;
416 if (err < 0)
417 ext3_abort(sb, __func__, "Couldn't clean up the journal");
418
419 if (!(sb->s_flags & MS_RDONLY)) {
420 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
421 es->s_state = cpu_to_le16(sbi->s_mount_state);
422 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
423 mark_buffer_dirty(sbi->s_sbh);
424 ext3_commit_super(sb, es, 1);
425 }
426
427 for (i = 0; i < sbi->s_gdb_count; i++)
428 brelse(sbi->s_group_desc[i]);
429 kfree(sbi->s_group_desc);
430 percpu_counter_destroy(&sbi->s_freeblocks_counter);
431 percpu_counter_destroy(&sbi->s_freeinodes_counter);
432 percpu_counter_destroy(&sbi->s_dirs_counter);
433 brelse(sbi->s_sbh);
434 #ifdef CONFIG_QUOTA
435 for (i = 0; i < MAXQUOTAS; i++)
436 kfree(sbi->s_qf_names[i]);
437 #endif
438
439 /* Debugging code just in case the in-memory inode orphan list
440 * isn't empty. The on-disk one can be non-empty if we've
441 * detected an error and taken the fs readonly, but the
442 * in-memory list had better be clean by this point. */
443 if (!list_empty(&sbi->s_orphan))
444 dump_orphan_list(sb, sbi);
445 J_ASSERT(list_empty(&sbi->s_orphan));
446
447 invalidate_bdev(sb->s_bdev);
448 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
449 /*
450 * Invalidate the journal device's buffers. We don't want them
451 * floating about in memory - the physical journal device may
452 * hotswapped, and it breaks the `ro-after' testing code.
453 */
454 sync_blockdev(sbi->journal_bdev);
455 invalidate_bdev(sbi->journal_bdev);
456 ext3_blkdev_remove(sbi);
457 }
458 sb->s_fs_info = NULL;
459 kfree(sbi->s_blockgroup_lock);
460 kfree(sbi);
461 }
462
463 static struct kmem_cache *ext3_inode_cachep;
464
465 /*
466 * Called inside transaction, so use GFP_NOFS
467 */
468 static struct inode *ext3_alloc_inode(struct super_block *sb)
469 {
470 struct ext3_inode_info *ei;
471
472 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
473 if (!ei)
474 return NULL;
475 ei->i_block_alloc_info = NULL;
476 ei->vfs_inode.i_version = 1;
477 atomic_set(&ei->i_datasync_tid, 0);
478 atomic_set(&ei->i_sync_tid, 0);
479 return &ei->vfs_inode;
480 }
481
482 static int ext3_drop_inode(struct inode *inode)
483 {
484 int drop = generic_drop_inode(inode);
485
486 trace_ext3_drop_inode(inode, drop);
487 return drop;
488 }
489
490 static void ext3_i_callback(struct rcu_head *head)
491 {
492 struct inode *inode = container_of(head, struct inode, i_rcu);
493 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
494 }
495
496 static void ext3_destroy_inode(struct inode *inode)
497 {
498 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
499 printk("EXT3 Inode %p: orphan list check failed!\n",
500 EXT3_I(inode));
501 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
502 EXT3_I(inode), sizeof(struct ext3_inode_info),
503 false);
504 dump_stack();
505 }
506 call_rcu(&inode->i_rcu, ext3_i_callback);
507 }
508
509 static void init_once(void *foo)
510 {
511 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
512
513 INIT_LIST_HEAD(&ei->i_orphan);
514 #ifdef CONFIG_EXT3_FS_XATTR
515 init_rwsem(&ei->xattr_sem);
516 #endif
517 mutex_init(&ei->truncate_mutex);
518 inode_init_once(&ei->vfs_inode);
519 }
520
521 static int init_inodecache(void)
522 {
523 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
524 sizeof(struct ext3_inode_info),
525 0, (SLAB_RECLAIM_ACCOUNT|
526 SLAB_MEM_SPREAD),
527 init_once);
528 if (ext3_inode_cachep == NULL)
529 return -ENOMEM;
530 return 0;
531 }
532
533 static void destroy_inodecache(void)
534 {
535 kmem_cache_destroy(ext3_inode_cachep);
536 }
537
538 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
539 {
540 #if defined(CONFIG_QUOTA)
541 struct ext3_sb_info *sbi = EXT3_SB(sb);
542
543 if (sbi->s_jquota_fmt) {
544 char *fmtname = "";
545
546 switch (sbi->s_jquota_fmt) {
547 case QFMT_VFS_OLD:
548 fmtname = "vfsold";
549 break;
550 case QFMT_VFS_V0:
551 fmtname = "vfsv0";
552 break;
553 case QFMT_VFS_V1:
554 fmtname = "vfsv1";
555 break;
556 }
557 seq_printf(seq, ",jqfmt=%s", fmtname);
558 }
559
560 if (sbi->s_qf_names[USRQUOTA])
561 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
562
563 if (sbi->s_qf_names[GRPQUOTA])
564 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
565
566 if (test_opt(sb, USRQUOTA))
567 seq_puts(seq, ",usrquota");
568
569 if (test_opt(sb, GRPQUOTA))
570 seq_puts(seq, ",grpquota");
571 #endif
572 }
573
574 static char *data_mode_string(unsigned long mode)
575 {
576 switch (mode) {
577 case EXT3_MOUNT_JOURNAL_DATA:
578 return "journal";
579 case EXT3_MOUNT_ORDERED_DATA:
580 return "ordered";
581 case EXT3_MOUNT_WRITEBACK_DATA:
582 return "writeback";
583 }
584 return "unknown";
585 }
586
587 /*
588 * Show an option if
589 * - it's set to a non-default value OR
590 * - if the per-sb default is different from the global default
591 */
592 static int ext3_show_options(struct seq_file *seq, struct dentry *root)
593 {
594 struct super_block *sb = root->d_sb;
595 struct ext3_sb_info *sbi = EXT3_SB(sb);
596 struct ext3_super_block *es = sbi->s_es;
597 unsigned long def_mount_opts;
598
599 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
600
601 if (sbi->s_sb_block != 1)
602 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
603 if (test_opt(sb, MINIX_DF))
604 seq_puts(seq, ",minixdf");
605 if (test_opt(sb, GRPID))
606 seq_puts(seq, ",grpid");
607 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
608 seq_puts(seq, ",nogrpid");
609 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT3_DEF_RESUID)) ||
610 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
611 seq_printf(seq, ",resuid=%u",
612 from_kuid_munged(&init_user_ns, sbi->s_resuid));
613 }
614 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT3_DEF_RESGID)) ||
615 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
616 seq_printf(seq, ",resgid=%u",
617 from_kgid_munged(&init_user_ns, sbi->s_resgid));
618 }
619 if (test_opt(sb, ERRORS_RO)) {
620 int def_errors = le16_to_cpu(es->s_errors);
621
622 if (def_errors == EXT3_ERRORS_PANIC ||
623 def_errors == EXT3_ERRORS_CONTINUE) {
624 seq_puts(seq, ",errors=remount-ro");
625 }
626 }
627 if (test_opt(sb, ERRORS_CONT))
628 seq_puts(seq, ",errors=continue");
629 if (test_opt(sb, ERRORS_PANIC))
630 seq_puts(seq, ",errors=panic");
631 if (test_opt(sb, NO_UID32))
632 seq_puts(seq, ",nouid32");
633 if (test_opt(sb, DEBUG))
634 seq_puts(seq, ",debug");
635 #ifdef CONFIG_EXT3_FS_XATTR
636 if (test_opt(sb, XATTR_USER))
637 seq_puts(seq, ",user_xattr");
638 if (!test_opt(sb, XATTR_USER) &&
639 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
640 seq_puts(seq, ",nouser_xattr");
641 }
642 #endif
643 #ifdef CONFIG_EXT3_FS_POSIX_ACL
644 if (test_opt(sb, POSIX_ACL))
645 seq_puts(seq, ",acl");
646 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
647 seq_puts(seq, ",noacl");
648 #endif
649 if (!test_opt(sb, RESERVATION))
650 seq_puts(seq, ",noreservation");
651 if (sbi->s_commit_interval) {
652 seq_printf(seq, ",commit=%u",
653 (unsigned) (sbi->s_commit_interval / HZ));
654 }
655
656 /*
657 * Always display barrier state so it's clear what the status is.
658 */
659 seq_puts(seq, ",barrier=");
660 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
661 seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
662 if (test_opt(sb, DATA_ERR_ABORT))
663 seq_puts(seq, ",data_err=abort");
664
665 if (test_opt(sb, NOLOAD))
666 seq_puts(seq, ",norecovery");
667
668 ext3_show_quota_options(seq, sb);
669
670 return 0;
671 }
672
673
674 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
675 u64 ino, u32 generation)
676 {
677 struct inode *inode;
678
679 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
680 return ERR_PTR(-ESTALE);
681 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
682 return ERR_PTR(-ESTALE);
683
684 /* iget isn't really right if the inode is currently unallocated!!
685 *
686 * ext3_read_inode will return a bad_inode if the inode had been
687 * deleted, so we should be safe.
688 *
689 * Currently we don't know the generation for parent directory, so
690 * a generation of 0 means "accept any"
691 */
692 inode = ext3_iget(sb, ino);
693 if (IS_ERR(inode))
694 return ERR_CAST(inode);
695 if (generation && inode->i_generation != generation) {
696 iput(inode);
697 return ERR_PTR(-ESTALE);
698 }
699
700 return inode;
701 }
702
703 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
704 int fh_len, int fh_type)
705 {
706 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
707 ext3_nfs_get_inode);
708 }
709
710 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
711 int fh_len, int fh_type)
712 {
713 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
714 ext3_nfs_get_inode);
715 }
716
717 /*
718 * Try to release metadata pages (indirect blocks, directories) which are
719 * mapped via the block device. Since these pages could have journal heads
720 * which would prevent try_to_free_buffers() from freeing them, we must use
721 * jbd layer's try_to_free_buffers() function to release them.
722 */
723 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
724 gfp_t wait)
725 {
726 journal_t *journal = EXT3_SB(sb)->s_journal;
727
728 WARN_ON(PageChecked(page));
729 if (!page_has_buffers(page))
730 return 0;
731 if (journal)
732 return journal_try_to_free_buffers(journal, page,
733 wait & ~__GFP_WAIT);
734 return try_to_free_buffers(page);
735 }
736
737 #ifdef CONFIG_QUOTA
738 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
739 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
740
741 static int ext3_write_dquot(struct dquot *dquot);
742 static int ext3_acquire_dquot(struct dquot *dquot);
743 static int ext3_release_dquot(struct dquot *dquot);
744 static int ext3_mark_dquot_dirty(struct dquot *dquot);
745 static int ext3_write_info(struct super_block *sb, int type);
746 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
747 struct path *path);
748 static int ext3_quota_on_mount(struct super_block *sb, int type);
749 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
750 size_t len, loff_t off);
751 static ssize_t ext3_quota_write(struct super_block *sb, int type,
752 const char *data, size_t len, loff_t off);
753
754 static const struct dquot_operations ext3_quota_operations = {
755 .write_dquot = ext3_write_dquot,
756 .acquire_dquot = ext3_acquire_dquot,
757 .release_dquot = ext3_release_dquot,
758 .mark_dirty = ext3_mark_dquot_dirty,
759 .write_info = ext3_write_info,
760 .alloc_dquot = dquot_alloc,
761 .destroy_dquot = dquot_destroy,
762 };
763
764 static const struct quotactl_ops ext3_qctl_operations = {
765 .quota_on = ext3_quota_on,
766 .quota_off = dquot_quota_off,
767 .quota_sync = dquot_quota_sync,
768 .get_info = dquot_get_dqinfo,
769 .set_info = dquot_set_dqinfo,
770 .get_dqblk = dquot_get_dqblk,
771 .set_dqblk = dquot_set_dqblk
772 };
773 #endif
774
775 static const struct super_operations ext3_sops = {
776 .alloc_inode = ext3_alloc_inode,
777 .destroy_inode = ext3_destroy_inode,
778 .write_inode = ext3_write_inode,
779 .dirty_inode = ext3_dirty_inode,
780 .drop_inode = ext3_drop_inode,
781 .evict_inode = ext3_evict_inode,
782 .put_super = ext3_put_super,
783 .sync_fs = ext3_sync_fs,
784 .freeze_fs = ext3_freeze,
785 .unfreeze_fs = ext3_unfreeze,
786 .statfs = ext3_statfs,
787 .remount_fs = ext3_remount,
788 .show_options = ext3_show_options,
789 #ifdef CONFIG_QUOTA
790 .quota_read = ext3_quota_read,
791 .quota_write = ext3_quota_write,
792 #endif
793 .bdev_try_to_free_page = bdev_try_to_free_page,
794 };
795
796 static const struct export_operations ext3_export_ops = {
797 .fh_to_dentry = ext3_fh_to_dentry,
798 .fh_to_parent = ext3_fh_to_parent,
799 .get_parent = ext3_get_parent,
800 };
801
802 enum {
803 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
804 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
805 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
806 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
807 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
808 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
809 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
810 Opt_data_err_abort, Opt_data_err_ignore,
811 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
812 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
813 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
814 Opt_resize, Opt_usrquota, Opt_grpquota
815 };
816
817 static const match_table_t tokens = {
818 {Opt_bsd_df, "bsddf"},
819 {Opt_minix_df, "minixdf"},
820 {Opt_grpid, "grpid"},
821 {Opt_grpid, "bsdgroups"},
822 {Opt_nogrpid, "nogrpid"},
823 {Opt_nogrpid, "sysvgroups"},
824 {Opt_resgid, "resgid=%u"},
825 {Opt_resuid, "resuid=%u"},
826 {Opt_sb, "sb=%u"},
827 {Opt_err_cont, "errors=continue"},
828 {Opt_err_panic, "errors=panic"},
829 {Opt_err_ro, "errors=remount-ro"},
830 {Opt_nouid32, "nouid32"},
831 {Opt_nocheck, "nocheck"},
832 {Opt_nocheck, "check=none"},
833 {Opt_debug, "debug"},
834 {Opt_oldalloc, "oldalloc"},
835 {Opt_orlov, "orlov"},
836 {Opt_user_xattr, "user_xattr"},
837 {Opt_nouser_xattr, "nouser_xattr"},
838 {Opt_acl, "acl"},
839 {Opt_noacl, "noacl"},
840 {Opt_reservation, "reservation"},
841 {Opt_noreservation, "noreservation"},
842 {Opt_noload, "noload"},
843 {Opt_noload, "norecovery"},
844 {Opt_nobh, "nobh"},
845 {Opt_bh, "bh"},
846 {Opt_commit, "commit=%u"},
847 {Opt_journal_update, "journal=update"},
848 {Opt_journal_inum, "journal=%u"},
849 {Opt_journal_dev, "journal_dev=%u"},
850 {Opt_abort, "abort"},
851 {Opt_data_journal, "data=journal"},
852 {Opt_data_ordered, "data=ordered"},
853 {Opt_data_writeback, "data=writeback"},
854 {Opt_data_err_abort, "data_err=abort"},
855 {Opt_data_err_ignore, "data_err=ignore"},
856 {Opt_offusrjquota, "usrjquota="},
857 {Opt_usrjquota, "usrjquota=%s"},
858 {Opt_offgrpjquota, "grpjquota="},
859 {Opt_grpjquota, "grpjquota=%s"},
860 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
861 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
862 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
863 {Opt_grpquota, "grpquota"},
864 {Opt_noquota, "noquota"},
865 {Opt_quota, "quota"},
866 {Opt_usrquota, "usrquota"},
867 {Opt_barrier, "barrier=%u"},
868 {Opt_barrier, "barrier"},
869 {Opt_nobarrier, "nobarrier"},
870 {Opt_resize, "resize"},
871 {Opt_err, NULL},
872 };
873
874 static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
875 {
876 ext3_fsblk_t sb_block;
877 char *options = (char *) *data;
878
879 if (!options || strncmp(options, "sb=", 3) != 0)
880 return 1; /* Default location */
881 options += 3;
882 /*todo: use simple_strtoll with >32bit ext3 */
883 sb_block = simple_strtoul(options, &options, 0);
884 if (*options && *options != ',') {
885 ext3_msg(sb, "error: invalid sb specification: %s",
886 (char *) *data);
887 return 1;
888 }
889 if (*options == ',')
890 options++;
891 *data = (void *) options;
892 return sb_block;
893 }
894
895 #ifdef CONFIG_QUOTA
896 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
897 {
898 struct ext3_sb_info *sbi = EXT3_SB(sb);
899 char *qname;
900
901 if (sb_any_quota_loaded(sb) &&
902 !sbi->s_qf_names[qtype]) {
903 ext3_msg(sb, KERN_ERR,
904 "Cannot change journaled "
905 "quota options when quota turned on");
906 return 0;
907 }
908 qname = match_strdup(args);
909 if (!qname) {
910 ext3_msg(sb, KERN_ERR,
911 "Not enough memory for storing quotafile name");
912 return 0;
913 }
914 if (sbi->s_qf_names[qtype] &&
915 strcmp(sbi->s_qf_names[qtype], qname)) {
916 ext3_msg(sb, KERN_ERR,
917 "%s quota file already specified", QTYPE2NAME(qtype));
918 kfree(qname);
919 return 0;
920 }
921 sbi->s_qf_names[qtype] = qname;
922 if (strchr(sbi->s_qf_names[qtype], '/')) {
923 ext3_msg(sb, KERN_ERR,
924 "quotafile must be on filesystem root");
925 kfree(sbi->s_qf_names[qtype]);
926 sbi->s_qf_names[qtype] = NULL;
927 return 0;
928 }
929 set_opt(sbi->s_mount_opt, QUOTA);
930 return 1;
931 }
932
933 static int clear_qf_name(struct super_block *sb, int qtype) {
934
935 struct ext3_sb_info *sbi = EXT3_SB(sb);
936
937 if (sb_any_quota_loaded(sb) &&
938 sbi->s_qf_names[qtype]) {
939 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
940 " when quota turned on");
941 return 0;
942 }
943 /*
944 * The space will be released later when all options are confirmed
945 * to be correct
946 */
947 sbi->s_qf_names[qtype] = NULL;
948 return 1;
949 }
950 #endif
951
952 static int parse_options (char *options, struct super_block *sb,
953 unsigned int *inum, unsigned long *journal_devnum,
954 ext3_fsblk_t *n_blocks_count, int is_remount)
955 {
956 struct ext3_sb_info *sbi = EXT3_SB(sb);
957 char * p;
958 substring_t args[MAX_OPT_ARGS];
959 int data_opt = 0;
960 int option;
961 kuid_t uid;
962 kgid_t gid;
963 #ifdef CONFIG_QUOTA
964 int qfmt;
965 #endif
966
967 if (!options)
968 return 1;
969
970 while ((p = strsep (&options, ",")) != NULL) {
971 int token;
972 if (!*p)
973 continue;
974 /*
975 * Initialize args struct so we know whether arg was
976 * found; some options take optional arguments.
977 */
978 args[0].to = args[0].from = 0;
979 token = match_token(p, tokens, args);
980 switch (token) {
981 case Opt_bsd_df:
982 clear_opt (sbi->s_mount_opt, MINIX_DF);
983 break;
984 case Opt_minix_df:
985 set_opt (sbi->s_mount_opt, MINIX_DF);
986 break;
987 case Opt_grpid:
988 set_opt (sbi->s_mount_opt, GRPID);
989 break;
990 case Opt_nogrpid:
991 clear_opt (sbi->s_mount_opt, GRPID);
992 break;
993 case Opt_resuid:
994 if (match_int(&args[0], &option))
995 return 0;
996 uid = make_kuid(current_user_ns(), option);
997 if (!uid_valid(uid)) {
998 ext3_msg(sb, KERN_ERR, "Invalid uid value %d", option);
999 return -1;
1000
1001 }
1002 sbi->s_resuid = uid;
1003 break;
1004 case Opt_resgid:
1005 if (match_int(&args[0], &option))
1006 return 0;
1007 gid = make_kgid(current_user_ns(), option);
1008 if (!gid_valid(gid)) {
1009 ext3_msg(sb, KERN_ERR, "Invalid gid value %d", option);
1010 return -1;
1011 }
1012 sbi->s_resgid = gid;
1013 break;
1014 case Opt_sb:
1015 /* handled by get_sb_block() instead of here */
1016 /* *sb_block = match_int(&args[0]); */
1017 break;
1018 case Opt_err_panic:
1019 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1020 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1021 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1022 break;
1023 case Opt_err_ro:
1024 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1025 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1026 set_opt (sbi->s_mount_opt, ERRORS_RO);
1027 break;
1028 case Opt_err_cont:
1029 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1030 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1031 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1032 break;
1033 case Opt_nouid32:
1034 set_opt (sbi->s_mount_opt, NO_UID32);
1035 break;
1036 case Opt_nocheck:
1037 clear_opt (sbi->s_mount_opt, CHECK);
1038 break;
1039 case Opt_debug:
1040 set_opt (sbi->s_mount_opt, DEBUG);
1041 break;
1042 case Opt_oldalloc:
1043 ext3_msg(sb, KERN_WARNING,
1044 "Ignoring deprecated oldalloc option");
1045 break;
1046 case Opt_orlov:
1047 ext3_msg(sb, KERN_WARNING,
1048 "Ignoring deprecated orlov option");
1049 break;
1050 #ifdef CONFIG_EXT3_FS_XATTR
1051 case Opt_user_xattr:
1052 set_opt (sbi->s_mount_opt, XATTR_USER);
1053 break;
1054 case Opt_nouser_xattr:
1055 clear_opt (sbi->s_mount_opt, XATTR_USER);
1056 break;
1057 #else
1058 case Opt_user_xattr:
1059 case Opt_nouser_xattr:
1060 ext3_msg(sb, KERN_INFO,
1061 "(no)user_xattr options not supported");
1062 break;
1063 #endif
1064 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1065 case Opt_acl:
1066 set_opt(sbi->s_mount_opt, POSIX_ACL);
1067 break;
1068 case Opt_noacl:
1069 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1070 break;
1071 #else
1072 case Opt_acl:
1073 case Opt_noacl:
1074 ext3_msg(sb, KERN_INFO,
1075 "(no)acl options not supported");
1076 break;
1077 #endif
1078 case Opt_reservation:
1079 set_opt(sbi->s_mount_opt, RESERVATION);
1080 break;
1081 case Opt_noreservation:
1082 clear_opt(sbi->s_mount_opt, RESERVATION);
1083 break;
1084 case Opt_journal_update:
1085 /* @@@ FIXME */
1086 /* Eventually we will want to be able to create
1087 a journal file here. For now, only allow the
1088 user to specify an existing inode to be the
1089 journal file. */
1090 if (is_remount) {
1091 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1092 "journal on remount");
1093 return 0;
1094 }
1095 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1096 break;
1097 case Opt_journal_inum:
1098 if (is_remount) {
1099 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1100 "journal on remount");
1101 return 0;
1102 }
1103 if (match_int(&args[0], &option))
1104 return 0;
1105 *inum = option;
1106 break;
1107 case Opt_journal_dev:
1108 if (is_remount) {
1109 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1110 "journal on remount");
1111 return 0;
1112 }
1113 if (match_int(&args[0], &option))
1114 return 0;
1115 *journal_devnum = option;
1116 break;
1117 case Opt_noload:
1118 set_opt (sbi->s_mount_opt, NOLOAD);
1119 break;
1120 case Opt_commit:
1121 if (match_int(&args[0], &option))
1122 return 0;
1123 if (option < 0)
1124 return 0;
1125 if (option == 0)
1126 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1127 sbi->s_commit_interval = HZ * option;
1128 break;
1129 case Opt_data_journal:
1130 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1131 goto datacheck;
1132 case Opt_data_ordered:
1133 data_opt = EXT3_MOUNT_ORDERED_DATA;
1134 goto datacheck;
1135 case Opt_data_writeback:
1136 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1137 datacheck:
1138 if (is_remount) {
1139 if (test_opt(sb, DATA_FLAGS) == data_opt)
1140 break;
1141 ext3_msg(sb, KERN_ERR,
1142 "error: cannot change "
1143 "data mode on remount. The filesystem "
1144 "is mounted in data=%s mode and you "
1145 "try to remount it in data=%s mode.",
1146 data_mode_string(test_opt(sb,
1147 DATA_FLAGS)),
1148 data_mode_string(data_opt));
1149 return 0;
1150 } else {
1151 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1152 sbi->s_mount_opt |= data_opt;
1153 }
1154 break;
1155 case Opt_data_err_abort:
1156 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1157 break;
1158 case Opt_data_err_ignore:
1159 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1160 break;
1161 #ifdef CONFIG_QUOTA
1162 case Opt_usrjquota:
1163 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1164 return 0;
1165 break;
1166 case Opt_grpjquota:
1167 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1168 return 0;
1169 break;
1170 case Opt_offusrjquota:
1171 if (!clear_qf_name(sb, USRQUOTA))
1172 return 0;
1173 break;
1174 case Opt_offgrpjquota:
1175 if (!clear_qf_name(sb, GRPQUOTA))
1176 return 0;
1177 break;
1178 case Opt_jqfmt_vfsold:
1179 qfmt = QFMT_VFS_OLD;
1180 goto set_qf_format;
1181 case Opt_jqfmt_vfsv0:
1182 qfmt = QFMT_VFS_V0;
1183 goto set_qf_format;
1184 case Opt_jqfmt_vfsv1:
1185 qfmt = QFMT_VFS_V1;
1186 set_qf_format:
1187 if (sb_any_quota_loaded(sb) &&
1188 sbi->s_jquota_fmt != qfmt) {
1189 ext3_msg(sb, KERN_ERR, "error: cannot change "
1190 "journaled quota options when "
1191 "quota turned on.");
1192 return 0;
1193 }
1194 sbi->s_jquota_fmt = qfmt;
1195 break;
1196 case Opt_quota:
1197 case Opt_usrquota:
1198 set_opt(sbi->s_mount_opt, QUOTA);
1199 set_opt(sbi->s_mount_opt, USRQUOTA);
1200 break;
1201 case Opt_grpquota:
1202 set_opt(sbi->s_mount_opt, QUOTA);
1203 set_opt(sbi->s_mount_opt, GRPQUOTA);
1204 break;
1205 case Opt_noquota:
1206 if (sb_any_quota_loaded(sb)) {
1207 ext3_msg(sb, KERN_ERR, "error: cannot change "
1208 "quota options when quota turned on.");
1209 return 0;
1210 }
1211 clear_opt(sbi->s_mount_opt, QUOTA);
1212 clear_opt(sbi->s_mount_opt, USRQUOTA);
1213 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1214 break;
1215 #else
1216 case Opt_quota:
1217 case Opt_usrquota:
1218 case Opt_grpquota:
1219 ext3_msg(sb, KERN_ERR,
1220 "error: quota options not supported.");
1221 break;
1222 case Opt_usrjquota:
1223 case Opt_grpjquota:
1224 case Opt_offusrjquota:
1225 case Opt_offgrpjquota:
1226 case Opt_jqfmt_vfsold:
1227 case Opt_jqfmt_vfsv0:
1228 case Opt_jqfmt_vfsv1:
1229 ext3_msg(sb, KERN_ERR,
1230 "error: journaled quota options not "
1231 "supported.");
1232 break;
1233 case Opt_noquota:
1234 break;
1235 #endif
1236 case Opt_abort:
1237 set_opt(sbi->s_mount_opt, ABORT);
1238 break;
1239 case Opt_nobarrier:
1240 clear_opt(sbi->s_mount_opt, BARRIER);
1241 break;
1242 case Opt_barrier:
1243 if (args[0].from) {
1244 if (match_int(&args[0], &option))
1245 return 0;
1246 } else
1247 option = 1; /* No argument, default to 1 */
1248 if (option)
1249 set_opt(sbi->s_mount_opt, BARRIER);
1250 else
1251 clear_opt(sbi->s_mount_opt, BARRIER);
1252 break;
1253 case Opt_ignore:
1254 break;
1255 case Opt_resize:
1256 if (!is_remount) {
1257 ext3_msg(sb, KERN_ERR,
1258 "error: resize option only available "
1259 "for remount");
1260 return 0;
1261 }
1262 if (match_int(&args[0], &option) != 0)
1263 return 0;
1264 *n_blocks_count = option;
1265 break;
1266 case Opt_nobh:
1267 ext3_msg(sb, KERN_WARNING,
1268 "warning: ignoring deprecated nobh option");
1269 break;
1270 case Opt_bh:
1271 ext3_msg(sb, KERN_WARNING,
1272 "warning: ignoring deprecated bh option");
1273 break;
1274 default:
1275 ext3_msg(sb, KERN_ERR,
1276 "error: unrecognized mount option \"%s\" "
1277 "or missing value", p);
1278 return 0;
1279 }
1280 }
1281 #ifdef CONFIG_QUOTA
1282 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1283 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1284 clear_opt(sbi->s_mount_opt, USRQUOTA);
1285 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1286 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1287
1288 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1289 ext3_msg(sb, KERN_ERR, "error: old and new quota "
1290 "format mixing.");
1291 return 0;
1292 }
1293
1294 if (!sbi->s_jquota_fmt) {
1295 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1296 "not specified.");
1297 return 0;
1298 }
1299 } else {
1300 if (sbi->s_jquota_fmt) {
1301 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1302 "specified with no journaling "
1303 "enabled.");
1304 return 0;
1305 }
1306 }
1307 #endif
1308 return 1;
1309 }
1310
1311 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1312 int read_only)
1313 {
1314 struct ext3_sb_info *sbi = EXT3_SB(sb);
1315 int res = 0;
1316
1317 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1318 ext3_msg(sb, KERN_ERR,
1319 "error: revision level too high, "
1320 "forcing read-only mode");
1321 res = MS_RDONLY;
1322 }
1323 if (read_only)
1324 return res;
1325 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1326 ext3_msg(sb, KERN_WARNING,
1327 "warning: mounting unchecked fs, "
1328 "running e2fsck is recommended");
1329 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1330 ext3_msg(sb, KERN_WARNING,
1331 "warning: mounting fs with errors, "
1332 "running e2fsck is recommended");
1333 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1334 le16_to_cpu(es->s_mnt_count) >=
1335 le16_to_cpu(es->s_max_mnt_count))
1336 ext3_msg(sb, KERN_WARNING,
1337 "warning: maximal mount count reached, "
1338 "running e2fsck is recommended");
1339 else if (le32_to_cpu(es->s_checkinterval) &&
1340 (le32_to_cpu(es->s_lastcheck) +
1341 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1342 ext3_msg(sb, KERN_WARNING,
1343 "warning: checktime reached, "
1344 "running e2fsck is recommended");
1345 #if 0
1346 /* @@@ We _will_ want to clear the valid bit if we find
1347 inconsistencies, to force a fsck at reboot. But for
1348 a plain journaled filesystem we can keep it set as
1349 valid forever! :) */
1350 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1351 #endif
1352 if (!le16_to_cpu(es->s_max_mnt_count))
1353 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1354 le16_add_cpu(&es->s_mnt_count, 1);
1355 es->s_mtime = cpu_to_le32(get_seconds());
1356 ext3_update_dynamic_rev(sb);
1357 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1358
1359 ext3_commit_super(sb, es, 1);
1360 if (test_opt(sb, DEBUG))
1361 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1362 "bpg=%lu, ipg=%lu, mo=%04lx]",
1363 sb->s_blocksize,
1364 sbi->s_groups_count,
1365 EXT3_BLOCKS_PER_GROUP(sb),
1366 EXT3_INODES_PER_GROUP(sb),
1367 sbi->s_mount_opt);
1368
1369 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1370 char b[BDEVNAME_SIZE];
1371 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1372 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1373 } else {
1374 ext3_msg(sb, KERN_INFO, "using internal journal");
1375 }
1376 cleancache_init_fs(sb);
1377 return res;
1378 }
1379
1380 /* Called at mount-time, super-block is locked */
1381 static int ext3_check_descriptors(struct super_block *sb)
1382 {
1383 struct ext3_sb_info *sbi = EXT3_SB(sb);
1384 int i;
1385
1386 ext3_debug ("Checking group descriptors");
1387
1388 for (i = 0; i < sbi->s_groups_count; i++) {
1389 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1390 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1391 ext3_fsblk_t last_block;
1392
1393 if (i == sbi->s_groups_count - 1)
1394 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1395 else
1396 last_block = first_block +
1397 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1398
1399 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1400 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1401 {
1402 ext3_error (sb, "ext3_check_descriptors",
1403 "Block bitmap for group %d"
1404 " not in group (block %lu)!",
1405 i, (unsigned long)
1406 le32_to_cpu(gdp->bg_block_bitmap));
1407 return 0;
1408 }
1409 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1410 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1411 {
1412 ext3_error (sb, "ext3_check_descriptors",
1413 "Inode bitmap for group %d"
1414 " not in group (block %lu)!",
1415 i, (unsigned long)
1416 le32_to_cpu(gdp->bg_inode_bitmap));
1417 return 0;
1418 }
1419 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1420 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1421 last_block)
1422 {
1423 ext3_error (sb, "ext3_check_descriptors",
1424 "Inode table for group %d"
1425 " not in group (block %lu)!",
1426 i, (unsigned long)
1427 le32_to_cpu(gdp->bg_inode_table));
1428 return 0;
1429 }
1430 }
1431
1432 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1433 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1434 return 1;
1435 }
1436
1437
1438 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1439 * the superblock) which were deleted from all directories, but held open by
1440 * a process at the time of a crash. We walk the list and try to delete these
1441 * inodes at recovery time (only with a read-write filesystem).
1442 *
1443 * In order to keep the orphan inode chain consistent during traversal (in
1444 * case of crash during recovery), we link each inode into the superblock
1445 * orphan list_head and handle it the same way as an inode deletion during
1446 * normal operation (which journals the operations for us).
1447 *
1448 * We only do an iget() and an iput() on each inode, which is very safe if we
1449 * accidentally point at an in-use or already deleted inode. The worst that
1450 * can happen in this case is that we get a "bit already cleared" message from
1451 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1452 * e2fsck was run on this filesystem, and it must have already done the orphan
1453 * inode cleanup for us, so we can safely abort without any further action.
1454 */
1455 static void ext3_orphan_cleanup (struct super_block * sb,
1456 struct ext3_super_block * es)
1457 {
1458 unsigned int s_flags = sb->s_flags;
1459 int nr_orphans = 0, nr_truncates = 0;
1460 #ifdef CONFIG_QUOTA
1461 int i;
1462 #endif
1463 if (!es->s_last_orphan) {
1464 jbd_debug(4, "no orphan inodes to clean up\n");
1465 return;
1466 }
1467
1468 if (bdev_read_only(sb->s_bdev)) {
1469 ext3_msg(sb, KERN_ERR, "error: write access "
1470 "unavailable, skipping orphan cleanup.");
1471 return;
1472 }
1473
1474 /* Check if feature set allows readwrite operations */
1475 if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) {
1476 ext3_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
1477 "unknown ROCOMPAT features");
1478 return;
1479 }
1480
1481 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1482 if (es->s_last_orphan)
1483 jbd_debug(1, "Errors on filesystem, "
1484 "clearing orphan list.\n");
1485 es->s_last_orphan = 0;
1486 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1487 return;
1488 }
1489
1490 if (s_flags & MS_RDONLY) {
1491 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1492 sb->s_flags &= ~MS_RDONLY;
1493 }
1494 #ifdef CONFIG_QUOTA
1495 /* Needed for iput() to work correctly and not trash data */
1496 sb->s_flags |= MS_ACTIVE;
1497 /* Turn on quotas so that they are updated correctly */
1498 for (i = 0; i < MAXQUOTAS; i++) {
1499 if (EXT3_SB(sb)->s_qf_names[i]) {
1500 int ret = ext3_quota_on_mount(sb, i);
1501 if (ret < 0)
1502 ext3_msg(sb, KERN_ERR,
1503 "error: cannot turn on journaled "
1504 "quota: %d", ret);
1505 }
1506 }
1507 #endif
1508
1509 while (es->s_last_orphan) {
1510 struct inode *inode;
1511
1512 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1513 if (IS_ERR(inode)) {
1514 es->s_last_orphan = 0;
1515 break;
1516 }
1517
1518 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1519 dquot_initialize(inode);
1520 if (inode->i_nlink) {
1521 printk(KERN_DEBUG
1522 "%s: truncating inode %lu to %Ld bytes\n",
1523 __func__, inode->i_ino, inode->i_size);
1524 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1525 inode->i_ino, inode->i_size);
1526 ext3_truncate(inode);
1527 nr_truncates++;
1528 } else {
1529 printk(KERN_DEBUG
1530 "%s: deleting unreferenced inode %lu\n",
1531 __func__, inode->i_ino);
1532 jbd_debug(2, "deleting unreferenced inode %lu\n",
1533 inode->i_ino);
1534 nr_orphans++;
1535 }
1536 iput(inode); /* The delete magic happens here! */
1537 }
1538
1539 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1540
1541 if (nr_orphans)
1542 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1543 PLURAL(nr_orphans));
1544 if (nr_truncates)
1545 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1546 PLURAL(nr_truncates));
1547 #ifdef CONFIG_QUOTA
1548 /* Turn quotas off */
1549 for (i = 0; i < MAXQUOTAS; i++) {
1550 if (sb_dqopt(sb)->files[i])
1551 dquot_quota_off(sb, i);
1552 }
1553 #endif
1554 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1555 }
1556
1557 /*
1558 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1559 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1560 * We need to be 1 filesystem block less than the 2^32 sector limit.
1561 */
1562 static loff_t ext3_max_size(int bits)
1563 {
1564 loff_t res = EXT3_NDIR_BLOCKS;
1565 int meta_blocks;
1566 loff_t upper_limit;
1567
1568 /* This is calculated to be the largest file size for a
1569 * dense, file such that the total number of
1570 * sectors in the file, including data and all indirect blocks,
1571 * does not exceed 2^32 -1
1572 * __u32 i_blocks representing the total number of
1573 * 512 bytes blocks of the file
1574 */
1575 upper_limit = (1LL << 32) - 1;
1576
1577 /* total blocks in file system block size */
1578 upper_limit >>= (bits - 9);
1579
1580
1581 /* indirect blocks */
1582 meta_blocks = 1;
1583 /* double indirect blocks */
1584 meta_blocks += 1 + (1LL << (bits-2));
1585 /* tripple indirect blocks */
1586 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1587
1588 upper_limit -= meta_blocks;
1589 upper_limit <<= bits;
1590
1591 res += 1LL << (bits-2);
1592 res += 1LL << (2*(bits-2));
1593 res += 1LL << (3*(bits-2));
1594 res <<= bits;
1595 if (res > upper_limit)
1596 res = upper_limit;
1597
1598 if (res > MAX_LFS_FILESIZE)
1599 res = MAX_LFS_FILESIZE;
1600
1601 return res;
1602 }
1603
1604 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1605 ext3_fsblk_t logic_sb_block,
1606 int nr)
1607 {
1608 struct ext3_sb_info *sbi = EXT3_SB(sb);
1609 unsigned long bg, first_meta_bg;
1610 int has_super = 0;
1611
1612 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1613
1614 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1615 nr < first_meta_bg)
1616 return (logic_sb_block + nr + 1);
1617 bg = sbi->s_desc_per_block * nr;
1618 if (ext3_bg_has_super(sb, bg))
1619 has_super = 1;
1620 return (has_super + ext3_group_first_block_no(sb, bg));
1621 }
1622
1623
1624 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1625 {
1626 struct buffer_head * bh;
1627 struct ext3_super_block *es = NULL;
1628 struct ext3_sb_info *sbi;
1629 ext3_fsblk_t block;
1630 ext3_fsblk_t sb_block = get_sb_block(&data, sb);
1631 ext3_fsblk_t logic_sb_block;
1632 unsigned long offset = 0;
1633 unsigned int journal_inum = 0;
1634 unsigned long journal_devnum = 0;
1635 unsigned long def_mount_opts;
1636 struct inode *root;
1637 int blocksize;
1638 int hblock;
1639 int db_count;
1640 int i;
1641 int needs_recovery;
1642 int ret = -EINVAL;
1643 __le32 features;
1644 int err;
1645
1646 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1647 if (!sbi)
1648 return -ENOMEM;
1649
1650 sbi->s_blockgroup_lock =
1651 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1652 if (!sbi->s_blockgroup_lock) {
1653 kfree(sbi);
1654 return -ENOMEM;
1655 }
1656 sb->s_fs_info = sbi;
1657 sbi->s_mount_opt = 0;
1658 sbi->s_resuid = make_kuid(&init_user_ns, EXT3_DEF_RESUID);
1659 sbi->s_resgid = make_kgid(&init_user_ns, EXT3_DEF_RESGID);
1660 sbi->s_sb_block = sb_block;
1661
1662 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1663 if (!blocksize) {
1664 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1665 goto out_fail;
1666 }
1667
1668 /*
1669 * The ext3 superblock will not be buffer aligned for other than 1kB
1670 * block sizes. We need to calculate the offset from buffer start.
1671 */
1672 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1673 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1674 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1675 } else {
1676 logic_sb_block = sb_block;
1677 }
1678
1679 if (!(bh = sb_bread(sb, logic_sb_block))) {
1680 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1681 goto out_fail;
1682 }
1683 /*
1684 * Note: s_es must be initialized as soon as possible because
1685 * some ext3 macro-instructions depend on its value
1686 */
1687 es = (struct ext3_super_block *) (bh->b_data + offset);
1688 sbi->s_es = es;
1689 sb->s_magic = le16_to_cpu(es->s_magic);
1690 if (sb->s_magic != EXT3_SUPER_MAGIC)
1691 goto cantfind_ext3;
1692
1693 /* Set defaults before we parse the mount options */
1694 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1695 if (def_mount_opts & EXT3_DEFM_DEBUG)
1696 set_opt(sbi->s_mount_opt, DEBUG);
1697 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1698 set_opt(sbi->s_mount_opt, GRPID);
1699 if (def_mount_opts & EXT3_DEFM_UID16)
1700 set_opt(sbi->s_mount_opt, NO_UID32);
1701 #ifdef CONFIG_EXT3_FS_XATTR
1702 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1703 set_opt(sbi->s_mount_opt, XATTR_USER);
1704 #endif
1705 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1706 if (def_mount_opts & EXT3_DEFM_ACL)
1707 set_opt(sbi->s_mount_opt, POSIX_ACL);
1708 #endif
1709 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1710 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1711 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1712 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1713 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1714 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1715
1716 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1717 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1718 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1719 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1720 else
1721 set_opt(sbi->s_mount_opt, ERRORS_RO);
1722
1723 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
1724 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
1725
1726 /* enable barriers by default */
1727 set_opt(sbi->s_mount_opt, BARRIER);
1728 set_opt(sbi->s_mount_opt, RESERVATION);
1729
1730 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1731 NULL, 0))
1732 goto failed_mount;
1733
1734 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1735 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1736
1737 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1738 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1739 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1740 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1741 ext3_msg(sb, KERN_WARNING,
1742 "warning: feature flags set on rev 0 fs, "
1743 "running e2fsck is recommended");
1744 /*
1745 * Check feature flags regardless of the revision level, since we
1746 * previously didn't change the revision level when setting the flags,
1747 * so there is a chance incompat flags are set on a rev 0 filesystem.
1748 */
1749 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1750 if (features) {
1751 ext3_msg(sb, KERN_ERR,
1752 "error: couldn't mount because of unsupported "
1753 "optional features (%x)", le32_to_cpu(features));
1754 goto failed_mount;
1755 }
1756 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1757 if (!(sb->s_flags & MS_RDONLY) && features) {
1758 ext3_msg(sb, KERN_ERR,
1759 "error: couldn't mount RDWR because of unsupported "
1760 "optional features (%x)", le32_to_cpu(features));
1761 goto failed_mount;
1762 }
1763 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1764
1765 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1766 blocksize > EXT3_MAX_BLOCK_SIZE) {
1767 ext3_msg(sb, KERN_ERR,
1768 "error: couldn't mount because of unsupported "
1769 "filesystem blocksize %d", blocksize);
1770 goto failed_mount;
1771 }
1772
1773 hblock = bdev_logical_block_size(sb->s_bdev);
1774 if (sb->s_blocksize != blocksize) {
1775 /*
1776 * Make sure the blocksize for the filesystem is larger
1777 * than the hardware sectorsize for the machine.
1778 */
1779 if (blocksize < hblock) {
1780 ext3_msg(sb, KERN_ERR,
1781 "error: fsblocksize %d too small for "
1782 "hardware sectorsize %d", blocksize, hblock);
1783 goto failed_mount;
1784 }
1785
1786 brelse (bh);
1787 if (!sb_set_blocksize(sb, blocksize)) {
1788 ext3_msg(sb, KERN_ERR,
1789 "error: bad blocksize %d", blocksize);
1790 goto out_fail;
1791 }
1792 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1793 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1794 bh = sb_bread(sb, logic_sb_block);
1795 if (!bh) {
1796 ext3_msg(sb, KERN_ERR,
1797 "error: can't read superblock on 2nd try");
1798 goto failed_mount;
1799 }
1800 es = (struct ext3_super_block *)(bh->b_data + offset);
1801 sbi->s_es = es;
1802 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1803 ext3_msg(sb, KERN_ERR,
1804 "error: magic mismatch");
1805 goto failed_mount;
1806 }
1807 }
1808
1809 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1810
1811 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1812 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1813 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1814 } else {
1815 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1816 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1817 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1818 (!is_power_of_2(sbi->s_inode_size)) ||
1819 (sbi->s_inode_size > blocksize)) {
1820 ext3_msg(sb, KERN_ERR,
1821 "error: unsupported inode size: %d",
1822 sbi->s_inode_size);
1823 goto failed_mount;
1824 }
1825 }
1826 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1827 le32_to_cpu(es->s_log_frag_size);
1828 if (blocksize != sbi->s_frag_size) {
1829 ext3_msg(sb, KERN_ERR,
1830 "error: fragsize %lu != blocksize %u (unsupported)",
1831 sbi->s_frag_size, blocksize);
1832 goto failed_mount;
1833 }
1834 sbi->s_frags_per_block = 1;
1835 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1836 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1837 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1838 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1839 goto cantfind_ext3;
1840 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1841 if (sbi->s_inodes_per_block == 0)
1842 goto cantfind_ext3;
1843 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1844 sbi->s_inodes_per_block;
1845 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1846 sbi->s_sbh = bh;
1847 sbi->s_mount_state = le16_to_cpu(es->s_state);
1848 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1849 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1850 for (i=0; i < 4; i++)
1851 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1852 sbi->s_def_hash_version = es->s_def_hash_version;
1853 i = le32_to_cpu(es->s_flags);
1854 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1855 sbi->s_hash_unsigned = 3;
1856 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1857 #ifdef __CHAR_UNSIGNED__
1858 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1859 sbi->s_hash_unsigned = 3;
1860 #else
1861 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1862 #endif
1863 }
1864
1865 if (sbi->s_blocks_per_group > blocksize * 8) {
1866 ext3_msg(sb, KERN_ERR,
1867 "#blocks per group too big: %lu",
1868 sbi->s_blocks_per_group);
1869 goto failed_mount;
1870 }
1871 if (sbi->s_frags_per_group > blocksize * 8) {
1872 ext3_msg(sb, KERN_ERR,
1873 "error: #fragments per group too big: %lu",
1874 sbi->s_frags_per_group);
1875 goto failed_mount;
1876 }
1877 if (sbi->s_inodes_per_group > blocksize * 8) {
1878 ext3_msg(sb, KERN_ERR,
1879 "error: #inodes per group too big: %lu",
1880 sbi->s_inodes_per_group);
1881 goto failed_mount;
1882 }
1883
1884 err = generic_check_addressable(sb->s_blocksize_bits,
1885 le32_to_cpu(es->s_blocks_count));
1886 if (err) {
1887 ext3_msg(sb, KERN_ERR,
1888 "error: filesystem is too large to mount safely");
1889 if (sizeof(sector_t) < 8)
1890 ext3_msg(sb, KERN_ERR,
1891 "error: CONFIG_LBDAF not enabled");
1892 ret = err;
1893 goto failed_mount;
1894 }
1895
1896 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1897 goto cantfind_ext3;
1898 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1899 le32_to_cpu(es->s_first_data_block) - 1)
1900 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1901 db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
1902 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1903 GFP_KERNEL);
1904 if (sbi->s_group_desc == NULL) {
1905 ext3_msg(sb, KERN_ERR,
1906 "error: not enough memory");
1907 ret = -ENOMEM;
1908 goto failed_mount;
1909 }
1910
1911 bgl_lock_init(sbi->s_blockgroup_lock);
1912
1913 for (i = 0; i < db_count; i++) {
1914 block = descriptor_loc(sb, logic_sb_block, i);
1915 sbi->s_group_desc[i] = sb_bread(sb, block);
1916 if (!sbi->s_group_desc[i]) {
1917 ext3_msg(sb, KERN_ERR,
1918 "error: can't read group descriptor %d", i);
1919 db_count = i;
1920 goto failed_mount2;
1921 }
1922 }
1923 if (!ext3_check_descriptors (sb)) {
1924 ext3_msg(sb, KERN_ERR,
1925 "error: group descriptors corrupted");
1926 goto failed_mount2;
1927 }
1928 sbi->s_gdb_count = db_count;
1929 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1930 spin_lock_init(&sbi->s_next_gen_lock);
1931
1932 /* per fileystem reservation list head & lock */
1933 spin_lock_init(&sbi->s_rsv_window_lock);
1934 sbi->s_rsv_window_root = RB_ROOT;
1935 /* Add a single, static dummy reservation to the start of the
1936 * reservation window list --- it gives us a placeholder for
1937 * append-at-start-of-list which makes the allocation logic
1938 * _much_ simpler. */
1939 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1940 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1941 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1942 sbi->s_rsv_window_head.rsv_goal_size = 0;
1943 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1944
1945 /*
1946 * set up enough so that it can read an inode
1947 */
1948 sb->s_op = &ext3_sops;
1949 sb->s_export_op = &ext3_export_ops;
1950 sb->s_xattr = ext3_xattr_handlers;
1951 #ifdef CONFIG_QUOTA
1952 sb->s_qcop = &ext3_qctl_operations;
1953 sb->dq_op = &ext3_quota_operations;
1954 #endif
1955 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
1956 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1957 mutex_init(&sbi->s_orphan_lock);
1958 mutex_init(&sbi->s_resize_lock);
1959
1960 sb->s_root = NULL;
1961
1962 needs_recovery = (es->s_last_orphan != 0 ||
1963 EXT3_HAS_INCOMPAT_FEATURE(sb,
1964 EXT3_FEATURE_INCOMPAT_RECOVER));
1965
1966 /*
1967 * The first inode we look at is the journal inode. Don't try
1968 * root first: it may be modified in the journal!
1969 */
1970 if (!test_opt(sb, NOLOAD) &&
1971 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1972 if (ext3_load_journal(sb, es, journal_devnum))
1973 goto failed_mount2;
1974 } else if (journal_inum) {
1975 if (ext3_create_journal(sb, es, journal_inum))
1976 goto failed_mount2;
1977 } else {
1978 if (!silent)
1979 ext3_msg(sb, KERN_ERR,
1980 "error: no journal found. "
1981 "mounting ext3 over ext2?");
1982 goto failed_mount2;
1983 }
1984 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1985 ext3_count_free_blocks(sb));
1986 if (!err) {
1987 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1988 ext3_count_free_inodes(sb));
1989 }
1990 if (!err) {
1991 err = percpu_counter_init(&sbi->s_dirs_counter,
1992 ext3_count_dirs(sb));
1993 }
1994 if (err) {
1995 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
1996 ret = err;
1997 goto failed_mount3;
1998 }
1999
2000 /* We have now updated the journal if required, so we can
2001 * validate the data journaling mode. */
2002 switch (test_opt(sb, DATA_FLAGS)) {
2003 case 0:
2004 /* No mode set, assume a default based on the journal
2005 capabilities: ORDERED_DATA if the journal can
2006 cope, else JOURNAL_DATA */
2007 if (journal_check_available_features
2008 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
2009 set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
2010 else
2011 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2012 break;
2013
2014 case EXT3_MOUNT_ORDERED_DATA:
2015 case EXT3_MOUNT_WRITEBACK_DATA:
2016 if (!journal_check_available_features
2017 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
2018 ext3_msg(sb, KERN_ERR,
2019 "error: journal does not support "
2020 "requested data journaling mode");
2021 goto failed_mount3;
2022 }
2023 default:
2024 break;
2025 }
2026
2027 /*
2028 * The journal_load will have done any necessary log recovery,
2029 * so we can safely mount the rest of the filesystem now.
2030 */
2031
2032 root = ext3_iget(sb, EXT3_ROOT_INO);
2033 if (IS_ERR(root)) {
2034 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
2035 ret = PTR_ERR(root);
2036 goto failed_mount3;
2037 }
2038 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2039 iput(root);
2040 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
2041 goto failed_mount3;
2042 }
2043 sb->s_root = d_make_root(root);
2044 if (!sb->s_root) {
2045 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
2046 ret = -ENOMEM;
2047 goto failed_mount3;
2048 }
2049
2050 if (ext3_setup_super(sb, es, sb->s_flags & MS_RDONLY))
2051 sb->s_flags |= MS_RDONLY;
2052
2053 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2054 ext3_orphan_cleanup(sb, es);
2055 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2056 if (needs_recovery) {
2057 ext3_mark_recovery_complete(sb, es);
2058 ext3_msg(sb, KERN_INFO, "recovery complete");
2059 }
2060 ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
2061 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2062 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2063 "writeback");
2064
2065 return 0;
2066
2067 cantfind_ext3:
2068 if (!silent)
2069 ext3_msg(sb, KERN_INFO,
2070 "error: can't find ext3 filesystem on dev %s.",
2071 sb->s_id);
2072 goto failed_mount;
2073
2074 failed_mount3:
2075 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2076 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2077 percpu_counter_destroy(&sbi->s_dirs_counter);
2078 journal_destroy(sbi->s_journal);
2079 failed_mount2:
2080 for (i = 0; i < db_count; i++)
2081 brelse(sbi->s_group_desc[i]);
2082 kfree(sbi->s_group_desc);
2083 failed_mount:
2084 #ifdef CONFIG_QUOTA
2085 for (i = 0; i < MAXQUOTAS; i++)
2086 kfree(sbi->s_qf_names[i]);
2087 #endif
2088 ext3_blkdev_remove(sbi);
2089 brelse(bh);
2090 out_fail:
2091 sb->s_fs_info = NULL;
2092 kfree(sbi->s_blockgroup_lock);
2093 kfree(sbi);
2094 return ret;
2095 }
2096
2097 /*
2098 * Setup any per-fs journal parameters now. We'll do this both on
2099 * initial mount, once the journal has been initialised but before we've
2100 * done any recovery; and again on any subsequent remount.
2101 */
2102 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2103 {
2104 struct ext3_sb_info *sbi = EXT3_SB(sb);
2105
2106 if (sbi->s_commit_interval)
2107 journal->j_commit_interval = sbi->s_commit_interval;
2108 /* We could also set up an ext3-specific default for the commit
2109 * interval here, but for now we'll just fall back to the jbd
2110 * default. */
2111
2112 spin_lock(&journal->j_state_lock);
2113 if (test_opt(sb, BARRIER))
2114 journal->j_flags |= JFS_BARRIER;
2115 else
2116 journal->j_flags &= ~JFS_BARRIER;
2117 if (test_opt(sb, DATA_ERR_ABORT))
2118 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2119 else
2120 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2121 spin_unlock(&journal->j_state_lock);
2122 }
2123
2124 static journal_t *ext3_get_journal(struct super_block *sb,
2125 unsigned int journal_inum)
2126 {
2127 struct inode *journal_inode;
2128 journal_t *journal;
2129
2130 /* First, test for the existence of a valid inode on disk. Bad
2131 * things happen if we iget() an unused inode, as the subsequent
2132 * iput() will try to delete it. */
2133
2134 journal_inode = ext3_iget(sb, journal_inum);
2135 if (IS_ERR(journal_inode)) {
2136 ext3_msg(sb, KERN_ERR, "error: no journal found");
2137 return NULL;
2138 }
2139 if (!journal_inode->i_nlink) {
2140 make_bad_inode(journal_inode);
2141 iput(journal_inode);
2142 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
2143 return NULL;
2144 }
2145
2146 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2147 journal_inode, journal_inode->i_size);
2148 if (!S_ISREG(journal_inode->i_mode)) {
2149 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
2150 iput(journal_inode);
2151 return NULL;
2152 }
2153
2154 journal = journal_init_inode(journal_inode);
2155 if (!journal) {
2156 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
2157 iput(journal_inode);
2158 return NULL;
2159 }
2160 journal->j_private = sb;
2161 ext3_init_journal_params(sb, journal);
2162 return journal;
2163 }
2164
2165 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2166 dev_t j_dev)
2167 {
2168 struct buffer_head * bh;
2169 journal_t *journal;
2170 ext3_fsblk_t start;
2171 ext3_fsblk_t len;
2172 int hblock, blocksize;
2173 ext3_fsblk_t sb_block;
2174 unsigned long offset;
2175 struct ext3_super_block * es;
2176 struct block_device *bdev;
2177
2178 bdev = ext3_blkdev_get(j_dev, sb);
2179 if (bdev == NULL)
2180 return NULL;
2181
2182 blocksize = sb->s_blocksize;
2183 hblock = bdev_logical_block_size(bdev);
2184 if (blocksize < hblock) {
2185 ext3_msg(sb, KERN_ERR,
2186 "error: blocksize too small for journal device");
2187 goto out_bdev;
2188 }
2189
2190 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2191 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2192 set_blocksize(bdev, blocksize);
2193 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2194 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2195 "external journal");
2196 goto out_bdev;
2197 }
2198
2199 es = (struct ext3_super_block *) (bh->b_data + offset);
2200 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2201 !(le32_to_cpu(es->s_feature_incompat) &
2202 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2203 ext3_msg(sb, KERN_ERR, "error: external journal has "
2204 "bad superblock");
2205 brelse(bh);
2206 goto out_bdev;
2207 }
2208
2209 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2210 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
2211 brelse(bh);
2212 goto out_bdev;
2213 }
2214
2215 len = le32_to_cpu(es->s_blocks_count);
2216 start = sb_block + 1;
2217 brelse(bh); /* we're done with the superblock */
2218
2219 journal = journal_init_dev(bdev, sb->s_bdev,
2220 start, len, blocksize);
2221 if (!journal) {
2222 ext3_msg(sb, KERN_ERR,
2223 "error: failed to create device journal");
2224 goto out_bdev;
2225 }
2226 journal->j_private = sb;
2227 if (!bh_uptodate_or_lock(journal->j_sb_buffer)) {
2228 if (bh_submit_read(journal->j_sb_buffer)) {
2229 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2230 goto out_journal;
2231 }
2232 }
2233 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2234 ext3_msg(sb, KERN_ERR,
2235 "error: external journal has more than one "
2236 "user (unsupported) - %d",
2237 be32_to_cpu(journal->j_superblock->s_nr_users));
2238 goto out_journal;
2239 }
2240 EXT3_SB(sb)->journal_bdev = bdev;
2241 ext3_init_journal_params(sb, journal);
2242 return journal;
2243 out_journal:
2244 journal_destroy(journal);
2245 out_bdev:
2246 ext3_blkdev_put(bdev);
2247 return NULL;
2248 }
2249
2250 static int ext3_load_journal(struct super_block *sb,
2251 struct ext3_super_block *es,
2252 unsigned long journal_devnum)
2253 {
2254 journal_t *journal;
2255 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2256 dev_t journal_dev;
2257 int err = 0;
2258 int really_read_only;
2259
2260 if (journal_devnum &&
2261 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2262 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2263 "numbers have changed");
2264 journal_dev = new_decode_dev(journal_devnum);
2265 } else
2266 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2267
2268 really_read_only = bdev_read_only(sb->s_bdev);
2269
2270 /*
2271 * Are we loading a blank journal or performing recovery after a
2272 * crash? For recovery, we need to check in advance whether we
2273 * can get read-write access to the device.
2274 */
2275
2276 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2277 if (sb->s_flags & MS_RDONLY) {
2278 ext3_msg(sb, KERN_INFO,
2279 "recovery required on readonly filesystem");
2280 if (really_read_only) {
2281 ext3_msg(sb, KERN_ERR, "error: write access "
2282 "unavailable, cannot proceed");
2283 return -EROFS;
2284 }
2285 ext3_msg(sb, KERN_INFO,
2286 "write access will be enabled during recovery");
2287 }
2288 }
2289
2290 if (journal_inum && journal_dev) {
2291 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2292 "and inode journals");
2293 return -EINVAL;
2294 }
2295
2296 if (journal_inum) {
2297 if (!(journal = ext3_get_journal(sb, journal_inum)))
2298 return -EINVAL;
2299 } else {
2300 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2301 return -EINVAL;
2302 }
2303
2304 if (!(journal->j_flags & JFS_BARRIER))
2305 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2306
2307 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2308 err = journal_update_format(journal);
2309 if (err) {
2310 ext3_msg(sb, KERN_ERR, "error updating journal");
2311 journal_destroy(journal);
2312 return err;
2313 }
2314 }
2315
2316 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2317 err = journal_wipe(journal, !really_read_only);
2318 if (!err)
2319 err = journal_load(journal);
2320
2321 if (err) {
2322 ext3_msg(sb, KERN_ERR, "error loading journal");
2323 journal_destroy(journal);
2324 return err;
2325 }
2326
2327 EXT3_SB(sb)->s_journal = journal;
2328 ext3_clear_journal_err(sb, es);
2329
2330 if (!really_read_only && journal_devnum &&
2331 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2332 es->s_journal_dev = cpu_to_le32(journal_devnum);
2333
2334 /* Make sure we flush the recovery flag to disk. */
2335 ext3_commit_super(sb, es, 1);
2336 }
2337
2338 return 0;
2339 }
2340
2341 static int ext3_create_journal(struct super_block *sb,
2342 struct ext3_super_block *es,
2343 unsigned int journal_inum)
2344 {
2345 journal_t *journal;
2346 int err;
2347
2348 if (sb->s_flags & MS_RDONLY) {
2349 ext3_msg(sb, KERN_ERR,
2350 "error: readonly filesystem when trying to "
2351 "create journal");
2352 return -EROFS;
2353 }
2354
2355 journal = ext3_get_journal(sb, journal_inum);
2356 if (!journal)
2357 return -EINVAL;
2358
2359 ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
2360 journal_inum);
2361
2362 err = journal_create(journal);
2363 if (err) {
2364 ext3_msg(sb, KERN_ERR, "error creating journal");
2365 journal_destroy(journal);
2366 return -EIO;
2367 }
2368
2369 EXT3_SB(sb)->s_journal = journal;
2370
2371 ext3_update_dynamic_rev(sb);
2372 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2373 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2374
2375 es->s_journal_inum = cpu_to_le32(journal_inum);
2376
2377 /* Make sure we flush the recovery flag to disk. */
2378 ext3_commit_super(sb, es, 1);
2379
2380 return 0;
2381 }
2382
2383 static int ext3_commit_super(struct super_block *sb,
2384 struct ext3_super_block *es,
2385 int sync)
2386 {
2387 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2388 int error = 0;
2389
2390 if (!sbh)
2391 return error;
2392
2393 if (buffer_write_io_error(sbh)) {
2394 /*
2395 * Oh, dear. A previous attempt to write the
2396 * superblock failed. This could happen because the
2397 * USB device was yanked out. Or it could happen to
2398 * be a transient write error and maybe the block will
2399 * be remapped. Nothing we can do but to retry the
2400 * write and hope for the best.
2401 */
2402 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2403 "superblock detected");
2404 clear_buffer_write_io_error(sbh);
2405 set_buffer_uptodate(sbh);
2406 }
2407 /*
2408 * If the file system is mounted read-only, don't update the
2409 * superblock write time. This avoids updating the superblock
2410 * write time when we are mounting the root file system
2411 * read/only but we need to replay the journal; at that point,
2412 * for people who are east of GMT and who make their clock
2413 * tick in localtime for Windows bug-for-bug compatibility,
2414 * the clock is set in the future, and this will cause e2fsck
2415 * to complain and force a full file system check.
2416 */
2417 if (!(sb->s_flags & MS_RDONLY))
2418 es->s_wtime = cpu_to_le32(get_seconds());
2419 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2420 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2421 BUFFER_TRACE(sbh, "marking dirty");
2422 mark_buffer_dirty(sbh);
2423 if (sync) {
2424 error = sync_dirty_buffer(sbh);
2425 if (buffer_write_io_error(sbh)) {
2426 ext3_msg(sb, KERN_ERR, "I/O error while writing "
2427 "superblock");
2428 clear_buffer_write_io_error(sbh);
2429 set_buffer_uptodate(sbh);
2430 }
2431 }
2432 return error;
2433 }
2434
2435
2436 /*
2437 * Have we just finished recovery? If so, and if we are mounting (or
2438 * remounting) the filesystem readonly, then we will end up with a
2439 * consistent fs on disk. Record that fact.
2440 */
2441 static void ext3_mark_recovery_complete(struct super_block * sb,
2442 struct ext3_super_block * es)
2443 {
2444 journal_t *journal = EXT3_SB(sb)->s_journal;
2445
2446 journal_lock_updates(journal);
2447 if (journal_flush(journal) < 0)
2448 goto out;
2449
2450 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2451 sb->s_flags & MS_RDONLY) {
2452 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2453 ext3_commit_super(sb, es, 1);
2454 }
2455
2456 out:
2457 journal_unlock_updates(journal);
2458 }
2459
2460 /*
2461 * If we are mounting (or read-write remounting) a filesystem whose journal
2462 * has recorded an error from a previous lifetime, move that error to the
2463 * main filesystem now.
2464 */
2465 static void ext3_clear_journal_err(struct super_block *sb,
2466 struct ext3_super_block *es)
2467 {
2468 journal_t *journal;
2469 int j_errno;
2470 const char *errstr;
2471
2472 journal = EXT3_SB(sb)->s_journal;
2473
2474 /*
2475 * Now check for any error status which may have been recorded in the
2476 * journal by a prior ext3_error() or ext3_abort()
2477 */
2478
2479 j_errno = journal_errno(journal);
2480 if (j_errno) {
2481 char nbuf[16];
2482
2483 errstr = ext3_decode_error(sb, j_errno, nbuf);
2484 ext3_warning(sb, __func__, "Filesystem error recorded "
2485 "from previous mount: %s", errstr);
2486 ext3_warning(sb, __func__, "Marking fs in need of "
2487 "filesystem check.");
2488
2489 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2490 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2491 ext3_commit_super (sb, es, 1);
2492
2493 journal_clear_err(journal);
2494 }
2495 }
2496
2497 /*
2498 * Force the running and committing transactions to commit,
2499 * and wait on the commit.
2500 */
2501 int ext3_force_commit(struct super_block *sb)
2502 {
2503 journal_t *journal;
2504 int ret;
2505
2506 if (sb->s_flags & MS_RDONLY)
2507 return 0;
2508
2509 journal = EXT3_SB(sb)->s_journal;
2510 ret = ext3_journal_force_commit(journal);
2511 return ret;
2512 }
2513
2514 static int ext3_sync_fs(struct super_block *sb, int wait)
2515 {
2516 tid_t target;
2517
2518 trace_ext3_sync_fs(sb, wait);
2519 /*
2520 * Writeback quota in non-journalled quota case - journalled quota has
2521 * no dirty dquots
2522 */
2523 dquot_writeback_dquots(sb, -1);
2524 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2525 if (wait)
2526 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2527 }
2528 return 0;
2529 }
2530
2531 /*
2532 * LVM calls this function before a (read-only) snapshot is created. This
2533 * gives us a chance to flush the journal completely and mark the fs clean.
2534 */
2535 static int ext3_freeze(struct super_block *sb)
2536 {
2537 int error = 0;
2538 journal_t *journal;
2539
2540 if (!(sb->s_flags & MS_RDONLY)) {
2541 journal = EXT3_SB(sb)->s_journal;
2542
2543 /* Now we set up the journal barrier. */
2544 journal_lock_updates(journal);
2545
2546 /*
2547 * We don't want to clear needs_recovery flag when we failed
2548 * to flush the journal.
2549 */
2550 error = journal_flush(journal);
2551 if (error < 0)
2552 goto out;
2553
2554 /* Journal blocked and flushed, clear needs_recovery flag. */
2555 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2556 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2557 if (error)
2558 goto out;
2559 }
2560 return 0;
2561
2562 out:
2563 journal_unlock_updates(journal);
2564 return error;
2565 }
2566
2567 /*
2568 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2569 * flag here, even though the filesystem is not technically dirty yet.
2570 */
2571 static int ext3_unfreeze(struct super_block *sb)
2572 {
2573 if (!(sb->s_flags & MS_RDONLY)) {
2574 lock_super(sb);
2575 /* Reser the needs_recovery flag before the fs is unlocked. */
2576 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2577 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2578 unlock_super(sb);
2579 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2580 }
2581 return 0;
2582 }
2583
2584 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2585 {
2586 struct ext3_super_block * es;
2587 struct ext3_sb_info *sbi = EXT3_SB(sb);
2588 ext3_fsblk_t n_blocks_count = 0;
2589 unsigned long old_sb_flags;
2590 struct ext3_mount_options old_opts;
2591 int enable_quota = 0;
2592 int err;
2593 #ifdef CONFIG_QUOTA
2594 int i;
2595 #endif
2596
2597 /* Store the original options */
2598 lock_super(sb);
2599 old_sb_flags = sb->s_flags;
2600 old_opts.s_mount_opt = sbi->s_mount_opt;
2601 old_opts.s_resuid = sbi->s_resuid;
2602 old_opts.s_resgid = sbi->s_resgid;
2603 old_opts.s_commit_interval = sbi->s_commit_interval;
2604 #ifdef CONFIG_QUOTA
2605 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2606 for (i = 0; i < MAXQUOTAS; i++)
2607 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2608 #endif
2609
2610 /*
2611 * Allow the "check" option to be passed as a remount option.
2612 */
2613 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2614 err = -EINVAL;
2615 goto restore_opts;
2616 }
2617
2618 if (test_opt(sb, ABORT))
2619 ext3_abort(sb, __func__, "Abort forced by user");
2620
2621 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2622 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2623
2624 es = sbi->s_es;
2625
2626 ext3_init_journal_params(sb, sbi->s_journal);
2627
2628 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2629 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2630 if (test_opt(sb, ABORT)) {
2631 err = -EROFS;
2632 goto restore_opts;
2633 }
2634
2635 if (*flags & MS_RDONLY) {
2636 err = dquot_suspend(sb, -1);
2637 if (err < 0)
2638 goto restore_opts;
2639
2640 /*
2641 * First of all, the unconditional stuff we have to do
2642 * to disable replay of the journal when we next remount
2643 */
2644 sb->s_flags |= MS_RDONLY;
2645
2646 /*
2647 * OK, test if we are remounting a valid rw partition
2648 * readonly, and if so set the rdonly flag and then
2649 * mark the partition as valid again.
2650 */
2651 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2652 (sbi->s_mount_state & EXT3_VALID_FS))
2653 es->s_state = cpu_to_le16(sbi->s_mount_state);
2654
2655 ext3_mark_recovery_complete(sb, es);
2656 } else {
2657 __le32 ret;
2658 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2659 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2660 ext3_msg(sb, KERN_WARNING,
2661 "warning: couldn't remount RDWR "
2662 "because of unsupported optional "
2663 "features (%x)", le32_to_cpu(ret));
2664 err = -EROFS;
2665 goto restore_opts;
2666 }
2667
2668 /*
2669 * If we have an unprocessed orphan list hanging
2670 * around from a previously readonly bdev mount,
2671 * require a full umount & mount for now.
2672 */
2673 if (es->s_last_orphan) {
2674 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
2675 "remount RDWR because of unprocessed "
2676 "orphan inode list. Please "
2677 "umount & mount instead.");
2678 err = -EINVAL;
2679 goto restore_opts;
2680 }
2681
2682 /*
2683 * Mounting a RDONLY partition read-write, so reread
2684 * and store the current valid flag. (It may have
2685 * been changed by e2fsck since we originally mounted
2686 * the partition.)
2687 */
2688 ext3_clear_journal_err(sb, es);
2689 sbi->s_mount_state = le16_to_cpu(es->s_state);
2690 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2691 goto restore_opts;
2692 if (!ext3_setup_super (sb, es, 0))
2693 sb->s_flags &= ~MS_RDONLY;
2694 enable_quota = 1;
2695 }
2696 }
2697 #ifdef CONFIG_QUOTA
2698 /* Release old quota file names */
2699 for (i = 0; i < MAXQUOTAS; i++)
2700 if (old_opts.s_qf_names[i] &&
2701 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2702 kfree(old_opts.s_qf_names[i]);
2703 #endif
2704 unlock_super(sb);
2705
2706 if (enable_quota)
2707 dquot_resume(sb, -1);
2708 return 0;
2709 restore_opts:
2710 sb->s_flags = old_sb_flags;
2711 sbi->s_mount_opt = old_opts.s_mount_opt;
2712 sbi->s_resuid = old_opts.s_resuid;
2713 sbi->s_resgid = old_opts.s_resgid;
2714 sbi->s_commit_interval = old_opts.s_commit_interval;
2715 #ifdef CONFIG_QUOTA
2716 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2717 for (i = 0; i < MAXQUOTAS; i++) {
2718 if (sbi->s_qf_names[i] &&
2719 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2720 kfree(sbi->s_qf_names[i]);
2721 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2722 }
2723 #endif
2724 unlock_super(sb);
2725 return err;
2726 }
2727
2728 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2729 {
2730 struct super_block *sb = dentry->d_sb;
2731 struct ext3_sb_info *sbi = EXT3_SB(sb);
2732 struct ext3_super_block *es = sbi->s_es;
2733 u64 fsid;
2734
2735 if (test_opt(sb, MINIX_DF)) {
2736 sbi->s_overhead_last = 0;
2737 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2738 unsigned long ngroups = sbi->s_groups_count, i;
2739 ext3_fsblk_t overhead = 0;
2740 smp_rmb();
2741
2742 /*
2743 * Compute the overhead (FS structures). This is constant
2744 * for a given filesystem unless the number of block groups
2745 * changes so we cache the previous value until it does.
2746 */
2747
2748 /*
2749 * All of the blocks before first_data_block are
2750 * overhead
2751 */
2752 overhead = le32_to_cpu(es->s_first_data_block);
2753
2754 /*
2755 * Add the overhead attributed to the superblock and
2756 * block group descriptors. If the sparse superblocks
2757 * feature is turned on, then not all groups have this.
2758 */
2759 for (i = 0; i < ngroups; i++) {
2760 overhead += ext3_bg_has_super(sb, i) +
2761 ext3_bg_num_gdb(sb, i);
2762 cond_resched();
2763 }
2764
2765 /*
2766 * Every block group has an inode bitmap, a block
2767 * bitmap, and an inode table.
2768 */
2769 overhead += ngroups * (2 + sbi->s_itb_per_group);
2770 sbi->s_overhead_last = overhead;
2771 smp_wmb();
2772 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2773 }
2774
2775 buf->f_type = EXT3_SUPER_MAGIC;
2776 buf->f_bsize = sb->s_blocksize;
2777 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2778 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2779 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2780 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2781 buf->f_bavail = 0;
2782 buf->f_files = le32_to_cpu(es->s_inodes_count);
2783 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2784 buf->f_namelen = EXT3_NAME_LEN;
2785 fsid = le64_to_cpup((void *)es->s_uuid) ^
2786 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2787 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2788 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2789 return 0;
2790 }
2791
2792 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2793 * is locked for write. Otherwise the are possible deadlocks:
2794 * Process 1 Process 2
2795 * ext3_create() quota_sync()
2796 * journal_start() write_dquot()
2797 * dquot_initialize() down(dqio_mutex)
2798 * down(dqio_mutex) journal_start()
2799 *
2800 */
2801
2802 #ifdef CONFIG_QUOTA
2803
2804 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2805 {
2806 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2807 }
2808
2809 static int ext3_write_dquot(struct dquot *dquot)
2810 {
2811 int ret, err;
2812 handle_t *handle;
2813 struct inode *inode;
2814
2815 inode = dquot_to_inode(dquot);
2816 handle = ext3_journal_start(inode,
2817 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2818 if (IS_ERR(handle))
2819 return PTR_ERR(handle);
2820 ret = dquot_commit(dquot);
2821 err = ext3_journal_stop(handle);
2822 if (!ret)
2823 ret = err;
2824 return ret;
2825 }
2826
2827 static int ext3_acquire_dquot(struct dquot *dquot)
2828 {
2829 int ret, err;
2830 handle_t *handle;
2831
2832 handle = ext3_journal_start(dquot_to_inode(dquot),
2833 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2834 if (IS_ERR(handle))
2835 return PTR_ERR(handle);
2836 ret = dquot_acquire(dquot);
2837 err = ext3_journal_stop(handle);
2838 if (!ret)
2839 ret = err;
2840 return ret;
2841 }
2842
2843 static int ext3_release_dquot(struct dquot *dquot)
2844 {
2845 int ret, err;
2846 handle_t *handle;
2847
2848 handle = ext3_journal_start(dquot_to_inode(dquot),
2849 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2850 if (IS_ERR(handle)) {
2851 /* Release dquot anyway to avoid endless cycle in dqput() */
2852 dquot_release(dquot);
2853 return PTR_ERR(handle);
2854 }
2855 ret = dquot_release(dquot);
2856 err = ext3_journal_stop(handle);
2857 if (!ret)
2858 ret = err;
2859 return ret;
2860 }
2861
2862 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2863 {
2864 /* Are we journaling quotas? */
2865 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2866 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2867 dquot_mark_dquot_dirty(dquot);
2868 return ext3_write_dquot(dquot);
2869 } else {
2870 return dquot_mark_dquot_dirty(dquot);
2871 }
2872 }
2873
2874 static int ext3_write_info(struct super_block *sb, int type)
2875 {
2876 int ret, err;
2877 handle_t *handle;
2878
2879 /* Data block + inode block */
2880 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2881 if (IS_ERR(handle))
2882 return PTR_ERR(handle);
2883 ret = dquot_commit_info(sb, type);
2884 err = ext3_journal_stop(handle);
2885 if (!ret)
2886 ret = err;
2887 return ret;
2888 }
2889
2890 /*
2891 * Turn on quotas during mount time - we need to find
2892 * the quota file and such...
2893 */
2894 static int ext3_quota_on_mount(struct super_block *sb, int type)
2895 {
2896 return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2897 EXT3_SB(sb)->s_jquota_fmt, type);
2898 }
2899
2900 /*
2901 * Standard function to be called on quota_on
2902 */
2903 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2904 struct path *path)
2905 {
2906 int err;
2907
2908 if (!test_opt(sb, QUOTA))
2909 return -EINVAL;
2910
2911 /* Quotafile not on the same filesystem? */
2912 if (path->dentry->d_sb != sb)
2913 return -EXDEV;
2914 /* Journaling quota? */
2915 if (EXT3_SB(sb)->s_qf_names[type]) {
2916 /* Quotafile not of fs root? */
2917 if (path->dentry->d_parent != sb->s_root)
2918 ext3_msg(sb, KERN_WARNING,
2919 "warning: Quota file not on filesystem root. "
2920 "Journaled quota will not work.");
2921 }
2922
2923 /*
2924 * When we journal data on quota file, we have to flush journal to see
2925 * all updates to the file when we bypass pagecache...
2926 */
2927 if (ext3_should_journal_data(path->dentry->d_inode)) {
2928 /*
2929 * We don't need to lock updates but journal_flush() could
2930 * otherwise be livelocked...
2931 */
2932 journal_lock_updates(EXT3_SB(sb)->s_journal);
2933 err = journal_flush(EXT3_SB(sb)->s_journal);
2934 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2935 if (err)
2936 return err;
2937 }
2938
2939 return dquot_quota_on(sb, type, format_id, path);
2940 }
2941
2942 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2943 * acquiring the locks... As quota files are never truncated and quota code
2944 * itself serializes the operations (and no one else should touch the files)
2945 * we don't have to be afraid of races */
2946 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2947 size_t len, loff_t off)
2948 {
2949 struct inode *inode = sb_dqopt(sb)->files[type];
2950 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2951 int err = 0;
2952 int offset = off & (sb->s_blocksize - 1);
2953 int tocopy;
2954 size_t toread;
2955 struct buffer_head *bh;
2956 loff_t i_size = i_size_read(inode);
2957
2958 if (off > i_size)
2959 return 0;
2960 if (off+len > i_size)
2961 len = i_size-off;
2962 toread = len;
2963 while (toread > 0) {
2964 tocopy = sb->s_blocksize - offset < toread ?
2965 sb->s_blocksize - offset : toread;
2966 bh = ext3_bread(NULL, inode, blk, 0, &err);
2967 if (err)
2968 return err;
2969 if (!bh) /* A hole? */
2970 memset(data, 0, tocopy);
2971 else
2972 memcpy(data, bh->b_data+offset, tocopy);
2973 brelse(bh);
2974 offset = 0;
2975 toread -= tocopy;
2976 data += tocopy;
2977 blk++;
2978 }
2979 return len;
2980 }
2981
2982 /* Write to quotafile (we know the transaction is already started and has
2983 * enough credits) */
2984 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2985 const char *data, size_t len, loff_t off)
2986 {
2987 struct inode *inode = sb_dqopt(sb)->files[type];
2988 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2989 int err = 0;
2990 int offset = off & (sb->s_blocksize - 1);
2991 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2992 struct buffer_head *bh;
2993 handle_t *handle = journal_current_handle();
2994
2995 if (!handle) {
2996 ext3_msg(sb, KERN_WARNING,
2997 "warning: quota write (off=%llu, len=%llu)"
2998 " cancelled because transaction is not started.",
2999 (unsigned long long)off, (unsigned long long)len);
3000 return -EIO;
3001 }
3002
3003 /*
3004 * Since we account only one data block in transaction credits,
3005 * then it is impossible to cross a block boundary.
3006 */
3007 if (sb->s_blocksize - offset < len) {
3008 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3009 " cancelled because not block aligned",
3010 (unsigned long long)off, (unsigned long long)len);
3011 return -EIO;
3012 }
3013 bh = ext3_bread(handle, inode, blk, 1, &err);
3014 if (!bh)
3015 goto out;
3016 if (journal_quota) {
3017 err = ext3_journal_get_write_access(handle, bh);
3018 if (err) {
3019 brelse(bh);
3020 goto out;
3021 }
3022 }
3023 lock_buffer(bh);
3024 memcpy(bh->b_data+offset, data, len);
3025 flush_dcache_page(bh->b_page);
3026 unlock_buffer(bh);
3027 if (journal_quota)
3028 err = ext3_journal_dirty_metadata(handle, bh);
3029 else {
3030 /* Always do at least ordered writes for quotas */
3031 err = ext3_journal_dirty_data(handle, bh);
3032 mark_buffer_dirty(bh);
3033 }
3034 brelse(bh);
3035 out:
3036 if (err)
3037 return err;
3038 if (inode->i_size < off + len) {
3039 i_size_write(inode, off + len);
3040 EXT3_I(inode)->i_disksize = inode->i_size;
3041 }
3042 inode->i_version++;
3043 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3044 ext3_mark_inode_dirty(handle, inode);
3045 return len;
3046 }
3047
3048 #endif
3049
3050 static struct dentry *ext3_mount(struct file_system_type *fs_type,
3051 int flags, const char *dev_name, void *data)
3052 {
3053 return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
3054 }
3055
3056 static struct file_system_type ext3_fs_type = {
3057 .owner = THIS_MODULE,
3058 .name = "ext3",
3059 .mount = ext3_mount,
3060 .kill_sb = kill_block_super,
3061 .fs_flags = FS_REQUIRES_DEV,
3062 };
3063
3064 static int __init init_ext3_fs(void)
3065 {
3066 int err = init_ext3_xattr();
3067 if (err)
3068 return err;
3069 err = init_inodecache();
3070 if (err)
3071 goto out1;
3072 err = register_filesystem(&ext3_fs_type);
3073 if (err)
3074 goto out;
3075 return 0;
3076 out:
3077 destroy_inodecache();
3078 out1:
3079 exit_ext3_xattr();
3080 return err;
3081 }
3082
3083 static void __exit exit_ext3_fs(void)
3084 {
3085 unregister_filesystem(&ext3_fs_type);
3086 destroy_inodecache();
3087 exit_ext3_xattr();
3088 }
3089
3090 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3091 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3092 MODULE_LICENSE("GPL");
3093 module_init(init_ext3_fs)
3094 module_exit(exit_ext3_fs)
Linux kernel - Deliverables
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