projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
[GitHub/mt8127/android_kernel_alcatel_ttab.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 /*
536 * Make sure all delayed rcu free inodes are flushed before we
537 * destroy cache.
538 */
539 rcu_barrier();
540 kmem_cache_destroy(ext3_inode_cachep);
541 }
542
543 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
544 {
545 #if defined(CONFIG_QUOTA)
546 struct ext3_sb_info *sbi = EXT3_SB(sb);
547
548 if (sbi->s_jquota_fmt) {
549 char *fmtname = "";
550
551 switch (sbi->s_jquota_fmt) {
552 case QFMT_VFS_OLD:
553 fmtname = "vfsold";
554 break;
555 case QFMT_VFS_V0:
556 fmtname = "vfsv0";
557 break;
558 case QFMT_VFS_V1:
559 fmtname = "vfsv1";
560 break;
561 }
562 seq_printf(seq, ",jqfmt=%s", fmtname);
563 }
564
565 if (sbi->s_qf_names[USRQUOTA])
566 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
567
568 if (sbi->s_qf_names[GRPQUOTA])
569 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
570
571 if (test_opt(sb, USRQUOTA))
572 seq_puts(seq, ",usrquota");
573
574 if (test_opt(sb, GRPQUOTA))
575 seq_puts(seq, ",grpquota");
576 #endif
577 }
578
579 static char *data_mode_string(unsigned long mode)
580 {
581 switch (mode) {
582 case EXT3_MOUNT_JOURNAL_DATA:
583 return "journal";
584 case EXT3_MOUNT_ORDERED_DATA:
585 return "ordered";
586 case EXT3_MOUNT_WRITEBACK_DATA:
587 return "writeback";
588 }
589 return "unknown";
590 }
591
592 /*
593 * Show an option if
594 * - it's set to a non-default value OR
595 * - if the per-sb default is different from the global default
596 */
597 static int ext3_show_options(struct seq_file *seq, struct dentry *root)
598 {
599 struct super_block *sb = root->d_sb;
600 struct ext3_sb_info *sbi = EXT3_SB(sb);
601 struct ext3_super_block *es = sbi->s_es;
602 unsigned long def_mount_opts;
603
604 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
605
606 if (sbi->s_sb_block != 1)
607 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
608 if (test_opt(sb, MINIX_DF))
609 seq_puts(seq, ",minixdf");
610 if (test_opt(sb, GRPID))
611 seq_puts(seq, ",grpid");
612 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
613 seq_puts(seq, ",nogrpid");
614 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT3_DEF_RESUID)) ||
615 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
616 seq_printf(seq, ",resuid=%u",
617 from_kuid_munged(&init_user_ns, sbi->s_resuid));
618 }
619 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT3_DEF_RESGID)) ||
620 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
621 seq_printf(seq, ",resgid=%u",
622 from_kgid_munged(&init_user_ns, sbi->s_resgid));
623 }
624 if (test_opt(sb, ERRORS_RO)) {
625 int def_errors = le16_to_cpu(es->s_errors);
626
627 if (def_errors == EXT3_ERRORS_PANIC ||
628 def_errors == EXT3_ERRORS_CONTINUE) {
629 seq_puts(seq, ",errors=remount-ro");
630 }
631 }
632 if (test_opt(sb, ERRORS_CONT))
633 seq_puts(seq, ",errors=continue");
634 if (test_opt(sb, ERRORS_PANIC))
635 seq_puts(seq, ",errors=panic");
636 if (test_opt(sb, NO_UID32))
637 seq_puts(seq, ",nouid32");
638 if (test_opt(sb, DEBUG))
639 seq_puts(seq, ",debug");
640 #ifdef CONFIG_EXT3_FS_XATTR
641 if (test_opt(sb, XATTR_USER))
642 seq_puts(seq, ",user_xattr");
643 if (!test_opt(sb, XATTR_USER) &&
644 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
645 seq_puts(seq, ",nouser_xattr");
646 }
647 #endif
648 #ifdef CONFIG_EXT3_FS_POSIX_ACL
649 if (test_opt(sb, POSIX_ACL))
650 seq_puts(seq, ",acl");
651 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
652 seq_puts(seq, ",noacl");
653 #endif
654 if (!test_opt(sb, RESERVATION))
655 seq_puts(seq, ",noreservation");
656 if (sbi->s_commit_interval) {
657 seq_printf(seq, ",commit=%u",
658 (unsigned) (sbi->s_commit_interval / HZ));
659 }
660
661 /*
662 * Always display barrier state so it's clear what the status is.
663 */
664 seq_puts(seq, ",barrier=");
665 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
666 seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
667 if (test_opt(sb, DATA_ERR_ABORT))
668 seq_puts(seq, ",data_err=abort");
669
670 if (test_opt(sb, NOLOAD))
671 seq_puts(seq, ",norecovery");
672
673 ext3_show_quota_options(seq, sb);
674
675 return 0;
676 }
677
678
679 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
680 u64 ino, u32 generation)
681 {
682 struct inode *inode;
683
684 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
685 return ERR_PTR(-ESTALE);
686 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
687 return ERR_PTR(-ESTALE);
688
689 /* iget isn't really right if the inode is currently unallocated!!
690 *
691 * ext3_read_inode will return a bad_inode if the inode had been
692 * deleted, so we should be safe.
693 *
694 * Currently we don't know the generation for parent directory, so
695 * a generation of 0 means "accept any"
696 */
697 inode = ext3_iget(sb, ino);
698 if (IS_ERR(inode))
699 return ERR_CAST(inode);
700 if (generation && inode->i_generation != generation) {
701 iput(inode);
702 return ERR_PTR(-ESTALE);
703 }
704
705 return inode;
706 }
707
708 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
709 int fh_len, int fh_type)
710 {
711 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
712 ext3_nfs_get_inode);
713 }
714
715 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
716 int fh_len, int fh_type)
717 {
718 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
719 ext3_nfs_get_inode);
720 }
721
722 /*
723 * Try to release metadata pages (indirect blocks, directories) which are
724 * mapped via the block device. Since these pages could have journal heads
725 * which would prevent try_to_free_buffers() from freeing them, we must use
726 * jbd layer's try_to_free_buffers() function to release them.
727 */
728 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
729 gfp_t wait)
730 {
731 journal_t *journal = EXT3_SB(sb)->s_journal;
732
733 WARN_ON(PageChecked(page));
734 if (!page_has_buffers(page))
735 return 0;
736 if (journal)
737 return journal_try_to_free_buffers(journal, page,
738 wait & ~__GFP_WAIT);
739 return try_to_free_buffers(page);
740 }
741
742 #ifdef CONFIG_QUOTA
743 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
744 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
745
746 static int ext3_write_dquot(struct dquot *dquot);
747 static int ext3_acquire_dquot(struct dquot *dquot);
748 static int ext3_release_dquot(struct dquot *dquot);
749 static int ext3_mark_dquot_dirty(struct dquot *dquot);
750 static int ext3_write_info(struct super_block *sb, int type);
751 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
752 struct path *path);
753 static int ext3_quota_on_mount(struct super_block *sb, int type);
754 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
755 size_t len, loff_t off);
756 static ssize_t ext3_quota_write(struct super_block *sb, int type,
757 const char *data, size_t len, loff_t off);
758
759 static const struct dquot_operations ext3_quota_operations = {
760 .write_dquot = ext3_write_dquot,
761 .acquire_dquot = ext3_acquire_dquot,
762 .release_dquot = ext3_release_dquot,
763 .mark_dirty = ext3_mark_dquot_dirty,
764 .write_info = ext3_write_info,
765 .alloc_dquot = dquot_alloc,
766 .destroy_dquot = dquot_destroy,
767 };
768
769 static const struct quotactl_ops ext3_qctl_operations = {
770 .quota_on = ext3_quota_on,
771 .quota_off = dquot_quota_off,
772 .quota_sync = dquot_quota_sync,
773 .get_info = dquot_get_dqinfo,
774 .set_info = dquot_set_dqinfo,
775 .get_dqblk = dquot_get_dqblk,
776 .set_dqblk = dquot_set_dqblk
777 };
778 #endif
779
780 static const struct super_operations ext3_sops = {
781 .alloc_inode = ext3_alloc_inode,
782 .destroy_inode = ext3_destroy_inode,
783 .write_inode = ext3_write_inode,
784 .dirty_inode = ext3_dirty_inode,
785 .drop_inode = ext3_drop_inode,
786 .evict_inode = ext3_evict_inode,
787 .put_super = ext3_put_super,
788 .sync_fs = ext3_sync_fs,
789 .freeze_fs = ext3_freeze,
790 .unfreeze_fs = ext3_unfreeze,
791 .statfs = ext3_statfs,
792 .remount_fs = ext3_remount,
793 .show_options = ext3_show_options,
794 #ifdef CONFIG_QUOTA
795 .quota_read = ext3_quota_read,
796 .quota_write = ext3_quota_write,
797 #endif
798 .bdev_try_to_free_page = bdev_try_to_free_page,
799 };
800
801 static const struct export_operations ext3_export_ops = {
802 .fh_to_dentry = ext3_fh_to_dentry,
803 .fh_to_parent = ext3_fh_to_parent,
804 .get_parent = ext3_get_parent,
805 };
806
807 enum {
808 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
809 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
810 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
811 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
812 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
813 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
814 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
815 Opt_data_err_abort, Opt_data_err_ignore,
816 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
817 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
818 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
819 Opt_resize, Opt_usrquota, Opt_grpquota
820 };
821
822 static const match_table_t tokens = {
823 {Opt_bsd_df, "bsddf"},
824 {Opt_minix_df, "minixdf"},
825 {Opt_grpid, "grpid"},
826 {Opt_grpid, "bsdgroups"},
827 {Opt_nogrpid, "nogrpid"},
828 {Opt_nogrpid, "sysvgroups"},
829 {Opt_resgid, "resgid=%u"},
830 {Opt_resuid, "resuid=%u"},
831 {Opt_sb, "sb=%u"},
832 {Opt_err_cont, "errors=continue"},
833 {Opt_err_panic, "errors=panic"},
834 {Opt_err_ro, "errors=remount-ro"},
835 {Opt_nouid32, "nouid32"},
836 {Opt_nocheck, "nocheck"},
837 {Opt_nocheck, "check=none"},
838 {Opt_debug, "debug"},
839 {Opt_oldalloc, "oldalloc"},
840 {Opt_orlov, "orlov"},
841 {Opt_user_xattr, "user_xattr"},
842 {Opt_nouser_xattr, "nouser_xattr"},
843 {Opt_acl, "acl"},
844 {Opt_noacl, "noacl"},
845 {Opt_reservation, "reservation"},
846 {Opt_noreservation, "noreservation"},
847 {Opt_noload, "noload"},
848 {Opt_noload, "norecovery"},
849 {Opt_nobh, "nobh"},
850 {Opt_bh, "bh"},
851 {Opt_commit, "commit=%u"},
852 {Opt_journal_update, "journal=update"},
853 {Opt_journal_inum, "journal=%u"},
854 {Opt_journal_dev, "journal_dev=%u"},
855 {Opt_abort, "abort"},
856 {Opt_data_journal, "data=journal"},
857 {Opt_data_ordered, "data=ordered"},
858 {Opt_data_writeback, "data=writeback"},
859 {Opt_data_err_abort, "data_err=abort"},
860 {Opt_data_err_ignore, "data_err=ignore"},
861 {Opt_offusrjquota, "usrjquota="},
862 {Opt_usrjquota, "usrjquota=%s"},
863 {Opt_offgrpjquota, "grpjquota="},
864 {Opt_grpjquota, "grpjquota=%s"},
865 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
866 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
867 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
868 {Opt_grpquota, "grpquota"},
869 {Opt_noquota, "noquota"},
870 {Opt_quota, "quota"},
871 {Opt_usrquota, "usrquota"},
872 {Opt_barrier, "barrier=%u"},
873 {Opt_barrier, "barrier"},
874 {Opt_nobarrier, "nobarrier"},
875 {Opt_resize, "resize"},
876 {Opt_err, NULL},
877 };
878
879 static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
880 {
881 ext3_fsblk_t sb_block;
882 char *options = (char *) *data;
883
884 if (!options || strncmp(options, "sb=", 3) != 0)
885 return 1; /* Default location */
886 options += 3;
887 /*todo: use simple_strtoll with >32bit ext3 */
888 sb_block = simple_strtoul(options, &options, 0);
889 if (*options && *options != ',') {
890 ext3_msg(sb, "error: invalid sb specification: %s",
891 (char *) *data);
892 return 1;
893 }
894 if (*options == ',')
895 options++;
896 *data = (void *) options;
897 return sb_block;
898 }
899
900 #ifdef CONFIG_QUOTA
901 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
902 {
903 struct ext3_sb_info *sbi = EXT3_SB(sb);
904 char *qname;
905
906 if (sb_any_quota_loaded(sb) &&
907 !sbi->s_qf_names[qtype]) {
908 ext3_msg(sb, KERN_ERR,
909 "Cannot change journaled "
910 "quota options when quota turned on");
911 return 0;
912 }
913 qname = match_strdup(args);
914 if (!qname) {
915 ext3_msg(sb, KERN_ERR,
916 "Not enough memory for storing quotafile name");
917 return 0;
918 }
919 if (sbi->s_qf_names[qtype] &&
920 strcmp(sbi->s_qf_names[qtype], qname)) {
921 ext3_msg(sb, KERN_ERR,
922 "%s quota file already specified", QTYPE2NAME(qtype));
923 kfree(qname);
924 return 0;
925 }
926 sbi->s_qf_names[qtype] = qname;
927 if (strchr(sbi->s_qf_names[qtype], '/')) {
928 ext3_msg(sb, KERN_ERR,
929 "quotafile must be on filesystem root");
930 kfree(sbi->s_qf_names[qtype]);
931 sbi->s_qf_names[qtype] = NULL;
932 return 0;
933 }
934 set_opt(sbi->s_mount_opt, QUOTA);
935 return 1;
936 }
937
938 static int clear_qf_name(struct super_block *sb, int qtype) {
939
940 struct ext3_sb_info *sbi = EXT3_SB(sb);
941
942 if (sb_any_quota_loaded(sb) &&
943 sbi->s_qf_names[qtype]) {
944 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
945 " when quota turned on");
946 return 0;
947 }
948 /*
949 * The space will be released later when all options are confirmed
950 * to be correct
951 */
952 sbi->s_qf_names[qtype] = NULL;
953 return 1;
954 }
955 #endif
956
957 static int parse_options (char *options, struct super_block *sb,
958 unsigned int *inum, unsigned long *journal_devnum,
959 ext3_fsblk_t *n_blocks_count, int is_remount)
960 {
961 struct ext3_sb_info *sbi = EXT3_SB(sb);
962 char * p;
963 substring_t args[MAX_OPT_ARGS];
964 int data_opt = 0;
965 int option;
966 kuid_t uid;
967 kgid_t gid;
968 #ifdef CONFIG_QUOTA
969 int qfmt;
970 #endif
971
972 if (!options)
973 return 1;
974
975 while ((p = strsep (&options, ",")) != NULL) {
976 int token;
977 if (!*p)
978 continue;
979 /*
980 * Initialize args struct so we know whether arg was
981 * found; some options take optional arguments.
982 */
983 args[0].to = args[0].from = NULL;
984 token = match_token(p, tokens, args);
985 switch (token) {
986 case Opt_bsd_df:
987 clear_opt (sbi->s_mount_opt, MINIX_DF);
988 break;
989 case Opt_minix_df:
990 set_opt (sbi->s_mount_opt, MINIX_DF);
991 break;
992 case Opt_grpid:
993 set_opt (sbi->s_mount_opt, GRPID);
994 break;
995 case Opt_nogrpid:
996 clear_opt (sbi->s_mount_opt, GRPID);
997 break;
998 case Opt_resuid:
999 if (match_int(&args[0], &option))
1000 return 0;
1001 uid = make_kuid(current_user_ns(), option);
1002 if (!uid_valid(uid)) {
1003 ext3_msg(sb, KERN_ERR, "Invalid uid value %d", option);
1004 return -1;
1005
1006 }
1007 sbi->s_resuid = uid;
1008 break;
1009 case Opt_resgid:
1010 if (match_int(&args[0], &option))
1011 return 0;
1012 gid = make_kgid(current_user_ns(), option);
1013 if (!gid_valid(gid)) {
1014 ext3_msg(sb, KERN_ERR, "Invalid gid value %d", option);
1015 return -1;
1016 }
1017 sbi->s_resgid = gid;
1018 break;
1019 case Opt_sb:
1020 /* handled by get_sb_block() instead of here */
1021 /* *sb_block = match_int(&args[0]); */
1022 break;
1023 case Opt_err_panic:
1024 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1025 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1026 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1027 break;
1028 case Opt_err_ro:
1029 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1030 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1031 set_opt (sbi->s_mount_opt, ERRORS_RO);
1032 break;
1033 case Opt_err_cont:
1034 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1035 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1036 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1037 break;
1038 case Opt_nouid32:
1039 set_opt (sbi->s_mount_opt, NO_UID32);
1040 break;
1041 case Opt_nocheck:
1042 clear_opt (sbi->s_mount_opt, CHECK);
1043 break;
1044 case Opt_debug:
1045 set_opt (sbi->s_mount_opt, DEBUG);
1046 break;
1047 case Opt_oldalloc:
1048 ext3_msg(sb, KERN_WARNING,
1049 "Ignoring deprecated oldalloc option");
1050 break;
1051 case Opt_orlov:
1052 ext3_msg(sb, KERN_WARNING,
1053 "Ignoring deprecated orlov option");
1054 break;
1055 #ifdef CONFIG_EXT3_FS_XATTR
1056 case Opt_user_xattr:
1057 set_opt (sbi->s_mount_opt, XATTR_USER);
1058 break;
1059 case Opt_nouser_xattr:
1060 clear_opt (sbi->s_mount_opt, XATTR_USER);
1061 break;
1062 #else
1063 case Opt_user_xattr:
1064 case Opt_nouser_xattr:
1065 ext3_msg(sb, KERN_INFO,
1066 "(no)user_xattr options not supported");
1067 break;
1068 #endif
1069 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1070 case Opt_acl:
1071 set_opt(sbi->s_mount_opt, POSIX_ACL);
1072 break;
1073 case Opt_noacl:
1074 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1075 break;
1076 #else
1077 case Opt_acl:
1078 case Opt_noacl:
1079 ext3_msg(sb, KERN_INFO,
1080 "(no)acl options not supported");
1081 break;
1082 #endif
1083 case Opt_reservation:
1084 set_opt(sbi->s_mount_opt, RESERVATION);
1085 break;
1086 case Opt_noreservation:
1087 clear_opt(sbi->s_mount_opt, RESERVATION);
1088 break;
1089 case Opt_journal_update:
1090 /* @@@ FIXME */
1091 /* Eventually we will want to be able to create
1092 a journal file here. For now, only allow the
1093 user to specify an existing inode to be the
1094 journal file. */
1095 if (is_remount) {
1096 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1097 "journal on remount");
1098 return 0;
1099 }
1100 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1101 break;
1102 case Opt_journal_inum:
1103 if (is_remount) {
1104 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1105 "journal on remount");
1106 return 0;
1107 }
1108 if (match_int(&args[0], &option))
1109 return 0;
1110 *inum = option;
1111 break;
1112 case Opt_journal_dev:
1113 if (is_remount) {
1114 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1115 "journal on remount");
1116 return 0;
1117 }
1118 if (match_int(&args[0], &option))
1119 return 0;
1120 *journal_devnum = option;
1121 break;
1122 case Opt_noload:
1123 set_opt (sbi->s_mount_opt, NOLOAD);
1124 break;
1125 case Opt_commit:
1126 if (match_int(&args[0], &option))
1127 return 0;
1128 if (option < 0)
1129 return 0;
1130 if (option == 0)
1131 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1132 sbi->s_commit_interval = HZ * option;
1133 break;
1134 case Opt_data_journal:
1135 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1136 goto datacheck;
1137 case Opt_data_ordered:
1138 data_opt = EXT3_MOUNT_ORDERED_DATA;
1139 goto datacheck;
1140 case Opt_data_writeback:
1141 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1142 datacheck:
1143 if (is_remount) {
1144 if (test_opt(sb, DATA_FLAGS) == data_opt)
1145 break;
1146 ext3_msg(sb, KERN_ERR,
1147 "error: cannot change "
1148 "data mode on remount. The filesystem "
1149 "is mounted in data=%s mode and you "
1150 "try to remount it in data=%s mode.",
1151 data_mode_string(test_opt(sb,
1152 DATA_FLAGS)),
1153 data_mode_string(data_opt));
1154 return 0;
1155 } else {
1156 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1157 sbi->s_mount_opt |= data_opt;
1158 }
1159 break;
1160 case Opt_data_err_abort:
1161 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1162 break;
1163 case Opt_data_err_ignore:
1164 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1165 break;
1166 #ifdef CONFIG_QUOTA
1167 case Opt_usrjquota:
1168 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1169 return 0;
1170 break;
1171 case Opt_grpjquota:
1172 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1173 return 0;
1174 break;
1175 case Opt_offusrjquota:
1176 if (!clear_qf_name(sb, USRQUOTA))
1177 return 0;
1178 break;
1179 case Opt_offgrpjquota:
1180 if (!clear_qf_name(sb, GRPQUOTA))
1181 return 0;
1182 break;
1183 case Opt_jqfmt_vfsold:
1184 qfmt = QFMT_VFS_OLD;
1185 goto set_qf_format;
1186 case Opt_jqfmt_vfsv0:
1187 qfmt = QFMT_VFS_V0;
1188 goto set_qf_format;
1189 case Opt_jqfmt_vfsv1:
1190 qfmt = QFMT_VFS_V1;
1191 set_qf_format:
1192 if (sb_any_quota_loaded(sb) &&
1193 sbi->s_jquota_fmt != qfmt) {
1194 ext3_msg(sb, KERN_ERR, "error: cannot change "
1195 "journaled quota options when "
1196 "quota turned on.");
1197 return 0;
1198 }
1199 sbi->s_jquota_fmt = qfmt;
1200 break;
1201 case Opt_quota:
1202 case Opt_usrquota:
1203 set_opt(sbi->s_mount_opt, QUOTA);
1204 set_opt(sbi->s_mount_opt, USRQUOTA);
1205 break;
1206 case Opt_grpquota:
1207 set_opt(sbi->s_mount_opt, QUOTA);
1208 set_opt(sbi->s_mount_opt, GRPQUOTA);
1209 break;
1210 case Opt_noquota:
1211 if (sb_any_quota_loaded(sb)) {
1212 ext3_msg(sb, KERN_ERR, "error: cannot change "
1213 "quota options when quota turned on.");
1214 return 0;
1215 }
1216 clear_opt(sbi->s_mount_opt, QUOTA);
1217 clear_opt(sbi->s_mount_opt, USRQUOTA);
1218 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1219 break;
1220 #else
1221 case Opt_quota:
1222 case Opt_usrquota:
1223 case Opt_grpquota:
1224 ext3_msg(sb, KERN_ERR,
1225 "error: quota options not supported.");
1226 break;
1227 case Opt_usrjquota:
1228 case Opt_grpjquota:
1229 case Opt_offusrjquota:
1230 case Opt_offgrpjquota:
1231 case Opt_jqfmt_vfsold:
1232 case Opt_jqfmt_vfsv0:
1233 case Opt_jqfmt_vfsv1:
1234 ext3_msg(sb, KERN_ERR,
1235 "error: journaled quota options not "
1236 "supported.");
1237 break;
1238 case Opt_noquota:
1239 break;
1240 #endif
1241 case Opt_abort:
1242 set_opt(sbi->s_mount_opt, ABORT);
1243 break;
1244 case Opt_nobarrier:
1245 clear_opt(sbi->s_mount_opt, BARRIER);
1246 break;
1247 case Opt_barrier:
1248 if (args[0].from) {
1249 if (match_int(&args[0], &option))
1250 return 0;
1251 } else
1252 option = 1; /* No argument, default to 1 */
1253 if (option)
1254 set_opt(sbi->s_mount_opt, BARRIER);
1255 else
1256 clear_opt(sbi->s_mount_opt, BARRIER);
1257 break;
1258 case Opt_ignore:
1259 break;
1260 case Opt_resize:
1261 if (!is_remount) {
1262 ext3_msg(sb, KERN_ERR,
1263 "error: resize option only available "
1264 "for remount");
1265 return 0;
1266 }
1267 if (match_int(&args[0], &option) != 0)
1268 return 0;
1269 *n_blocks_count = option;
1270 break;
1271 case Opt_nobh:
1272 ext3_msg(sb, KERN_WARNING,
1273 "warning: ignoring deprecated nobh option");
1274 break;
1275 case Opt_bh:
1276 ext3_msg(sb, KERN_WARNING,
1277 "warning: ignoring deprecated bh option");
1278 break;
1279 default:
1280 ext3_msg(sb, KERN_ERR,
1281 "error: unrecognized mount option \"%s\" "
1282 "or missing value", p);
1283 return 0;
1284 }
1285 }
1286 #ifdef CONFIG_QUOTA
1287 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1288 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1289 clear_opt(sbi->s_mount_opt, USRQUOTA);
1290 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1291 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1292
1293 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1294 ext3_msg(sb, KERN_ERR, "error: old and new quota "
1295 "format mixing.");
1296 return 0;
1297 }
1298
1299 if (!sbi->s_jquota_fmt) {
1300 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1301 "not specified.");
1302 return 0;
1303 }
1304 } else {
1305 if (sbi->s_jquota_fmt) {
1306 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1307 "specified with no journaling "
1308 "enabled.");
1309 return 0;
1310 }
1311 }
1312 #endif
1313 return 1;
1314 }
1315
1316 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1317 int read_only)
1318 {
1319 struct ext3_sb_info *sbi = EXT3_SB(sb);
1320 int res = 0;
1321
1322 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1323 ext3_msg(sb, KERN_ERR,
1324 "error: revision level too high, "
1325 "forcing read-only mode");
1326 res = MS_RDONLY;
1327 }
1328 if (read_only)
1329 return res;
1330 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1331 ext3_msg(sb, KERN_WARNING,
1332 "warning: mounting unchecked fs, "
1333 "running e2fsck is recommended");
1334 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1335 ext3_msg(sb, KERN_WARNING,
1336 "warning: mounting fs with errors, "
1337 "running e2fsck is recommended");
1338 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1339 le16_to_cpu(es->s_mnt_count) >=
1340 le16_to_cpu(es->s_max_mnt_count))
1341 ext3_msg(sb, KERN_WARNING,
1342 "warning: maximal mount count reached, "
1343 "running e2fsck is recommended");
1344 else if (le32_to_cpu(es->s_checkinterval) &&
1345 (le32_to_cpu(es->s_lastcheck) +
1346 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1347 ext3_msg(sb, KERN_WARNING,
1348 "warning: checktime reached, "
1349 "running e2fsck is recommended");
1350 #if 0
1351 /* @@@ We _will_ want to clear the valid bit if we find
1352 inconsistencies, to force a fsck at reboot. But for
1353 a plain journaled filesystem we can keep it set as
1354 valid forever! :) */
1355 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1356 #endif
1357 if (!le16_to_cpu(es->s_max_mnt_count))
1358 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1359 le16_add_cpu(&es->s_mnt_count, 1);
1360 es->s_mtime = cpu_to_le32(get_seconds());
1361 ext3_update_dynamic_rev(sb);
1362 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1363
1364 ext3_commit_super(sb, es, 1);
1365 if (test_opt(sb, DEBUG))
1366 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1367 "bpg=%lu, ipg=%lu, mo=%04lx]",
1368 sb->s_blocksize,
1369 sbi->s_groups_count,
1370 EXT3_BLOCKS_PER_GROUP(sb),
1371 EXT3_INODES_PER_GROUP(sb),
1372 sbi->s_mount_opt);
1373
1374 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1375 char b[BDEVNAME_SIZE];
1376 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1377 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1378 } else {
1379 ext3_msg(sb, KERN_INFO, "using internal journal");
1380 }
1381 cleancache_init_fs(sb);
1382 return res;
1383 }
1384
1385 /* Called at mount-time, super-block is locked */
1386 static int ext3_check_descriptors(struct super_block *sb)
1387 {
1388 struct ext3_sb_info *sbi = EXT3_SB(sb);
1389 int i;
1390
1391 ext3_debug ("Checking group descriptors");
1392
1393 for (i = 0; i < sbi->s_groups_count; i++) {
1394 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1395 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1396 ext3_fsblk_t last_block;
1397
1398 if (i == sbi->s_groups_count - 1)
1399 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1400 else
1401 last_block = first_block +
1402 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1403
1404 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1405 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1406 {
1407 ext3_error (sb, "ext3_check_descriptors",
1408 "Block bitmap for group %d"
1409 " not in group (block %lu)!",
1410 i, (unsigned long)
1411 le32_to_cpu(gdp->bg_block_bitmap));
1412 return 0;
1413 }
1414 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1415 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1416 {
1417 ext3_error (sb, "ext3_check_descriptors",
1418 "Inode bitmap for group %d"
1419 " not in group (block %lu)!",
1420 i, (unsigned long)
1421 le32_to_cpu(gdp->bg_inode_bitmap));
1422 return 0;
1423 }
1424 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1425 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1426 last_block)
1427 {
1428 ext3_error (sb, "ext3_check_descriptors",
1429 "Inode table for group %d"
1430 " not in group (block %lu)!",
1431 i, (unsigned long)
1432 le32_to_cpu(gdp->bg_inode_table));
1433 return 0;
1434 }
1435 }
1436
1437 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1438 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1439 return 1;
1440 }
1441
1442
1443 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1444 * the superblock) which were deleted from all directories, but held open by
1445 * a process at the time of a crash. We walk the list and try to delete these
1446 * inodes at recovery time (only with a read-write filesystem).
1447 *
1448 * In order to keep the orphan inode chain consistent during traversal (in
1449 * case of crash during recovery), we link each inode into the superblock
1450 * orphan list_head and handle it the same way as an inode deletion during
1451 * normal operation (which journals the operations for us).
1452 *
1453 * We only do an iget() and an iput() on each inode, which is very safe if we
1454 * accidentally point at an in-use or already deleted inode. The worst that
1455 * can happen in this case is that we get a "bit already cleared" message from
1456 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1457 * e2fsck was run on this filesystem, and it must have already done the orphan
1458 * inode cleanup for us, so we can safely abort without any further action.
1459 */
1460 static void ext3_orphan_cleanup (struct super_block * sb,
1461 struct ext3_super_block * es)
1462 {
1463 unsigned int s_flags = sb->s_flags;
1464 int nr_orphans = 0, nr_truncates = 0;
1465 #ifdef CONFIG_QUOTA
1466 int i;
1467 #endif
1468 if (!es->s_last_orphan) {
1469 jbd_debug(4, "no orphan inodes to clean up\n");
1470 return;
1471 }
1472
1473 if (bdev_read_only(sb->s_bdev)) {
1474 ext3_msg(sb, KERN_ERR, "error: write access "
1475 "unavailable, skipping orphan cleanup.");
1476 return;
1477 }
1478
1479 /* Check if feature set allows readwrite operations */
1480 if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) {
1481 ext3_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
1482 "unknown ROCOMPAT features");
1483 return;
1484 }
1485
1486 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1487 /* don't clear list on RO mount w/ errors */
1488 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
1489 jbd_debug(1, "Errors on filesystem, "
1490 "clearing orphan list.\n");
1491 es->s_last_orphan = 0;
1492 }
1493 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1494 return;
1495 }
1496
1497 if (s_flags & MS_RDONLY) {
1498 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1499 sb->s_flags &= ~MS_RDONLY;
1500 }
1501 #ifdef CONFIG_QUOTA
1502 /* Needed for iput() to work correctly and not trash data */
1503 sb->s_flags |= MS_ACTIVE;
1504 /* Turn on quotas so that they are updated correctly */
1505 for (i = 0; i < MAXQUOTAS; i++) {
1506 if (EXT3_SB(sb)->s_qf_names[i]) {
1507 int ret = ext3_quota_on_mount(sb, i);
1508 if (ret < 0)
1509 ext3_msg(sb, KERN_ERR,
1510 "error: cannot turn on journaled "
1511 "quota: %d", ret);
1512 }
1513 }
1514 #endif
1515
1516 while (es->s_last_orphan) {
1517 struct inode *inode;
1518
1519 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1520 if (IS_ERR(inode)) {
1521 es->s_last_orphan = 0;
1522 break;
1523 }
1524
1525 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1526 dquot_initialize(inode);
1527 if (inode->i_nlink) {
1528 printk(KERN_DEBUG
1529 "%s: truncating inode %lu to %Ld bytes\n",
1530 __func__, inode->i_ino, inode->i_size);
1531 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1532 inode->i_ino, inode->i_size);
1533 ext3_truncate(inode);
1534 nr_truncates++;
1535 } else {
1536 printk(KERN_DEBUG
1537 "%s: deleting unreferenced inode %lu\n",
1538 __func__, inode->i_ino);
1539 jbd_debug(2, "deleting unreferenced inode %lu\n",
1540 inode->i_ino);
1541 nr_orphans++;
1542 }
1543 iput(inode); /* The delete magic happens here! */
1544 }
1545
1546 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1547
1548 if (nr_orphans)
1549 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1550 PLURAL(nr_orphans));
1551 if (nr_truncates)
1552 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1553 PLURAL(nr_truncates));
1554 #ifdef CONFIG_QUOTA
1555 /* Turn quotas off */
1556 for (i = 0; i < MAXQUOTAS; i++) {
1557 if (sb_dqopt(sb)->files[i])
1558 dquot_quota_off(sb, i);
1559 }
1560 #endif
1561 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1562 }
1563
1564 /*
1565 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1566 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1567 * We need to be 1 filesystem block less than the 2^32 sector limit.
1568 */
1569 static loff_t ext3_max_size(int bits)
1570 {
1571 loff_t res = EXT3_NDIR_BLOCKS;
1572 int meta_blocks;
1573 loff_t upper_limit;
1574
1575 /* This is calculated to be the largest file size for a
1576 * dense, file such that the total number of
1577 * sectors in the file, including data and all indirect blocks,
1578 * does not exceed 2^32 -1
1579 * __u32 i_blocks representing the total number of
1580 * 512 bytes blocks of the file
1581 */
1582 upper_limit = (1LL << 32) - 1;
1583
1584 /* total blocks in file system block size */
1585 upper_limit >>= (bits - 9);
1586
1587
1588 /* indirect blocks */
1589 meta_blocks = 1;
1590 /* double indirect blocks */
1591 meta_blocks += 1 + (1LL << (bits-2));
1592 /* tripple indirect blocks */
1593 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1594
1595 upper_limit -= meta_blocks;
1596 upper_limit <<= bits;
1597
1598 res += 1LL << (bits-2);
1599 res += 1LL << (2*(bits-2));
1600 res += 1LL << (3*(bits-2));
1601 res <<= bits;
1602 if (res > upper_limit)
1603 res = upper_limit;
1604
1605 if (res > MAX_LFS_FILESIZE)
1606 res = MAX_LFS_FILESIZE;
1607
1608 return res;
1609 }
1610
1611 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1612 ext3_fsblk_t logic_sb_block,
1613 int nr)
1614 {
1615 struct ext3_sb_info *sbi = EXT3_SB(sb);
1616 unsigned long bg, first_meta_bg;
1617 int has_super = 0;
1618
1619 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1620
1621 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1622 nr < first_meta_bg)
1623 return (logic_sb_block + nr + 1);
1624 bg = sbi->s_desc_per_block * nr;
1625 if (ext3_bg_has_super(sb, bg))
1626 has_super = 1;
1627 return (has_super + ext3_group_first_block_no(sb, bg));
1628 }
1629
1630
1631 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1632 {
1633 struct buffer_head * bh;
1634 struct ext3_super_block *es = NULL;
1635 struct ext3_sb_info *sbi;
1636 ext3_fsblk_t block;
1637 ext3_fsblk_t sb_block = get_sb_block(&data, sb);
1638 ext3_fsblk_t logic_sb_block;
1639 unsigned long offset = 0;
1640 unsigned int journal_inum = 0;
1641 unsigned long journal_devnum = 0;
1642 unsigned long def_mount_opts;
1643 struct inode *root;
1644 int blocksize;
1645 int hblock;
1646 int db_count;
1647 int i;
1648 int needs_recovery;
1649 int ret = -EINVAL;
1650 __le32 features;
1651 int err;
1652
1653 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1654 if (!sbi)
1655 return -ENOMEM;
1656
1657 sbi->s_blockgroup_lock =
1658 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1659 if (!sbi->s_blockgroup_lock) {
1660 kfree(sbi);
1661 return -ENOMEM;
1662 }
1663 sb->s_fs_info = sbi;
1664 sbi->s_mount_opt = 0;
1665 sbi->s_resuid = make_kuid(&init_user_ns, EXT3_DEF_RESUID);
1666 sbi->s_resgid = make_kgid(&init_user_ns, EXT3_DEF_RESGID);
1667 sbi->s_sb_block = sb_block;
1668
1669 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1670 if (!blocksize) {
1671 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1672 goto out_fail;
1673 }
1674
1675 /*
1676 * The ext3 superblock will not be buffer aligned for other than 1kB
1677 * block sizes. We need to calculate the offset from buffer start.
1678 */
1679 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1680 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1681 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1682 } else {
1683 logic_sb_block = sb_block;
1684 }
1685
1686 if (!(bh = sb_bread(sb, logic_sb_block))) {
1687 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1688 goto out_fail;
1689 }
1690 /*
1691 * Note: s_es must be initialized as soon as possible because
1692 * some ext3 macro-instructions depend on its value
1693 */
1694 es = (struct ext3_super_block *) (bh->b_data + offset);
1695 sbi->s_es = es;
1696 sb->s_magic = le16_to_cpu(es->s_magic);
1697 if (sb->s_magic != EXT3_SUPER_MAGIC)
1698 goto cantfind_ext3;
1699
1700 /* Set defaults before we parse the mount options */
1701 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1702 if (def_mount_opts & EXT3_DEFM_DEBUG)
1703 set_opt(sbi->s_mount_opt, DEBUG);
1704 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1705 set_opt(sbi->s_mount_opt, GRPID);
1706 if (def_mount_opts & EXT3_DEFM_UID16)
1707 set_opt(sbi->s_mount_opt, NO_UID32);
1708 #ifdef CONFIG_EXT3_FS_XATTR
1709 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1710 set_opt(sbi->s_mount_opt, XATTR_USER);
1711 #endif
1712 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1713 if (def_mount_opts & EXT3_DEFM_ACL)
1714 set_opt(sbi->s_mount_opt, POSIX_ACL);
1715 #endif
1716 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1717 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1718 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1719 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1720 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1721 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1722
1723 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1724 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1725 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1726 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1727 else
1728 set_opt(sbi->s_mount_opt, ERRORS_RO);
1729
1730 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
1731 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
1732
1733 /* enable barriers by default */
1734 set_opt(sbi->s_mount_opt, BARRIER);
1735 set_opt(sbi->s_mount_opt, RESERVATION);
1736
1737 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1738 NULL, 0))
1739 goto failed_mount;
1740
1741 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1742 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1743
1744 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1745 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1746 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1747 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1748 ext3_msg(sb, KERN_WARNING,
1749 "warning: feature flags set on rev 0 fs, "
1750 "running e2fsck is recommended");
1751 /*
1752 * Check feature flags regardless of the revision level, since we
1753 * previously didn't change the revision level when setting the flags,
1754 * so there is a chance incompat flags are set on a rev 0 filesystem.
1755 */
1756 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1757 if (features) {
1758 ext3_msg(sb, KERN_ERR,
1759 "error: couldn't mount because of unsupported "
1760 "optional features (%x)", le32_to_cpu(features));
1761 goto failed_mount;
1762 }
1763 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1764 if (!(sb->s_flags & MS_RDONLY) && features) {
1765 ext3_msg(sb, KERN_ERR,
1766 "error: couldn't mount RDWR because of unsupported "
1767 "optional features (%x)", le32_to_cpu(features));
1768 goto failed_mount;
1769 }
1770 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1771
1772 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1773 blocksize > EXT3_MAX_BLOCK_SIZE) {
1774 ext3_msg(sb, KERN_ERR,
1775 "error: couldn't mount because of unsupported "
1776 "filesystem blocksize %d", blocksize);
1777 goto failed_mount;
1778 }
1779
1780 hblock = bdev_logical_block_size(sb->s_bdev);
1781 if (sb->s_blocksize != blocksize) {
1782 /*
1783 * Make sure the blocksize for the filesystem is larger
1784 * than the hardware sectorsize for the machine.
1785 */
1786 if (blocksize < hblock) {
1787 ext3_msg(sb, KERN_ERR,
1788 "error: fsblocksize %d too small for "
1789 "hardware sectorsize %d", blocksize, hblock);
1790 goto failed_mount;
1791 }
1792
1793 brelse (bh);
1794 if (!sb_set_blocksize(sb, blocksize)) {
1795 ext3_msg(sb, KERN_ERR,
1796 "error: bad blocksize %d", blocksize);
1797 goto out_fail;
1798 }
1799 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1800 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1801 bh = sb_bread(sb, logic_sb_block);
1802 if (!bh) {
1803 ext3_msg(sb, KERN_ERR,
1804 "error: can't read superblock on 2nd try");
1805 goto failed_mount;
1806 }
1807 es = (struct ext3_super_block *)(bh->b_data + offset);
1808 sbi->s_es = es;
1809 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1810 ext3_msg(sb, KERN_ERR,
1811 "error: magic mismatch");
1812 goto failed_mount;
1813 }
1814 }
1815
1816 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1817
1818 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1819 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1820 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1821 } else {
1822 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1823 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1824 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1825 (!is_power_of_2(sbi->s_inode_size)) ||
1826 (sbi->s_inode_size > blocksize)) {
1827 ext3_msg(sb, KERN_ERR,
1828 "error: unsupported inode size: %d",
1829 sbi->s_inode_size);
1830 goto failed_mount;
1831 }
1832 }
1833 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1834 le32_to_cpu(es->s_log_frag_size);
1835 if (blocksize != sbi->s_frag_size) {
1836 ext3_msg(sb, KERN_ERR,
1837 "error: fragsize %lu != blocksize %u (unsupported)",
1838 sbi->s_frag_size, blocksize);
1839 goto failed_mount;
1840 }
1841 sbi->s_frags_per_block = 1;
1842 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1843 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1844 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1845 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1846 goto cantfind_ext3;
1847 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1848 if (sbi->s_inodes_per_block == 0)
1849 goto cantfind_ext3;
1850 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1851 sbi->s_inodes_per_block;
1852 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1853 sbi->s_sbh = bh;
1854 sbi->s_mount_state = le16_to_cpu(es->s_state);
1855 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1856 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1857 for (i=0; i < 4; i++)
1858 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1859 sbi->s_def_hash_version = es->s_def_hash_version;
1860 i = le32_to_cpu(es->s_flags);
1861 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1862 sbi->s_hash_unsigned = 3;
1863 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1864 #ifdef __CHAR_UNSIGNED__
1865 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1866 sbi->s_hash_unsigned = 3;
1867 #else
1868 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1869 #endif
1870 }
1871
1872 if (sbi->s_blocks_per_group > blocksize * 8) {
1873 ext3_msg(sb, KERN_ERR,
1874 "#blocks per group too big: %lu",
1875 sbi->s_blocks_per_group);
1876 goto failed_mount;
1877 }
1878 if (sbi->s_frags_per_group > blocksize * 8) {
1879 ext3_msg(sb, KERN_ERR,
1880 "error: #fragments per group too big: %lu",
1881 sbi->s_frags_per_group);
1882 goto failed_mount;
1883 }
1884 if (sbi->s_inodes_per_group > blocksize * 8) {
1885 ext3_msg(sb, KERN_ERR,
1886 "error: #inodes per group too big: %lu",
1887 sbi->s_inodes_per_group);
1888 goto failed_mount;
1889 }
1890
1891 err = generic_check_addressable(sb->s_blocksize_bits,
1892 le32_to_cpu(es->s_blocks_count));
1893 if (err) {
1894 ext3_msg(sb, KERN_ERR,
1895 "error: filesystem is too large to mount safely");
1896 if (sizeof(sector_t) < 8)
1897 ext3_msg(sb, KERN_ERR,
1898 "error: CONFIG_LBDAF not enabled");
1899 ret = err;
1900 goto failed_mount;
1901 }
1902
1903 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1904 goto cantfind_ext3;
1905 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1906 le32_to_cpu(es->s_first_data_block) - 1)
1907 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1908 db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
1909 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1910 GFP_KERNEL);
1911 if (sbi->s_group_desc == NULL) {
1912 ext3_msg(sb, KERN_ERR,
1913 "error: not enough memory");
1914 ret = -ENOMEM;
1915 goto failed_mount;
1916 }
1917
1918 bgl_lock_init(sbi->s_blockgroup_lock);
1919
1920 for (i = 0; i < db_count; i++) {
1921 block = descriptor_loc(sb, logic_sb_block, i);
1922 sbi->s_group_desc[i] = sb_bread(sb, block);
1923 if (!sbi->s_group_desc[i]) {
1924 ext3_msg(sb, KERN_ERR,
1925 "error: can't read group descriptor %d", i);
1926 db_count = i;
1927 goto failed_mount2;
1928 }
1929 }
1930 if (!ext3_check_descriptors (sb)) {
1931 ext3_msg(sb, KERN_ERR,
1932 "error: group descriptors corrupted");
1933 goto failed_mount2;
1934 }
1935 sbi->s_gdb_count = db_count;
1936 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1937 spin_lock_init(&sbi->s_next_gen_lock);
1938
1939 /* per fileystem reservation list head & lock */
1940 spin_lock_init(&sbi->s_rsv_window_lock);
1941 sbi->s_rsv_window_root = RB_ROOT;
1942 /* Add a single, static dummy reservation to the start of the
1943 * reservation window list --- it gives us a placeholder for
1944 * append-at-start-of-list which makes the allocation logic
1945 * _much_ simpler. */
1946 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1947 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1948 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1949 sbi->s_rsv_window_head.rsv_goal_size = 0;
1950 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1951
1952 /*
1953 * set up enough so that it can read an inode
1954 */
1955 sb->s_op = &ext3_sops;
1956 sb->s_export_op = &ext3_export_ops;
1957 sb->s_xattr = ext3_xattr_handlers;
1958 #ifdef CONFIG_QUOTA
1959 sb->s_qcop = &ext3_qctl_operations;
1960 sb->dq_op = &ext3_quota_operations;
1961 #endif
1962 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
1963 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1964 mutex_init(&sbi->s_orphan_lock);
1965 mutex_init(&sbi->s_resize_lock);
1966
1967 sb->s_root = NULL;
1968
1969 needs_recovery = (es->s_last_orphan != 0 ||
1970 EXT3_HAS_INCOMPAT_FEATURE(sb,
1971 EXT3_FEATURE_INCOMPAT_RECOVER));
1972
1973 /*
1974 * The first inode we look at is the journal inode. Don't try
1975 * root first: it may be modified in the journal!
1976 */
1977 if (!test_opt(sb, NOLOAD) &&
1978 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1979 if (ext3_load_journal(sb, es, journal_devnum))
1980 goto failed_mount2;
1981 } else if (journal_inum) {
1982 if (ext3_create_journal(sb, es, journal_inum))
1983 goto failed_mount2;
1984 } else {
1985 if (!silent)
1986 ext3_msg(sb, KERN_ERR,
1987 "error: no journal found. "
1988 "mounting ext3 over ext2?");
1989 goto failed_mount2;
1990 }
1991 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1992 ext3_count_free_blocks(sb));
1993 if (!err) {
1994 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1995 ext3_count_free_inodes(sb));
1996 }
1997 if (!err) {
1998 err = percpu_counter_init(&sbi->s_dirs_counter,
1999 ext3_count_dirs(sb));
2000 }
2001 if (err) {
2002 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
2003 ret = err;
2004 goto failed_mount3;
2005 }
2006
2007 /* We have now updated the journal if required, so we can
2008 * validate the data journaling mode. */
2009 switch (test_opt(sb, DATA_FLAGS)) {
2010 case 0:
2011 /* No mode set, assume a default based on the journal
2012 capabilities: ORDERED_DATA if the journal can
2013 cope, else JOURNAL_DATA */
2014 if (journal_check_available_features
2015 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
2016 set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
2017 else
2018 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2019 break;
2020
2021 case EXT3_MOUNT_ORDERED_DATA:
2022 case EXT3_MOUNT_WRITEBACK_DATA:
2023 if (!journal_check_available_features
2024 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
2025 ext3_msg(sb, KERN_ERR,
2026 "error: journal does not support "
2027 "requested data journaling mode");
2028 goto failed_mount3;
2029 }
2030 default:
2031 break;
2032 }
2033
2034 /*
2035 * The journal_load will have done any necessary log recovery,
2036 * so we can safely mount the rest of the filesystem now.
2037 */
2038
2039 root = ext3_iget(sb, EXT3_ROOT_INO);
2040 if (IS_ERR(root)) {
2041 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
2042 ret = PTR_ERR(root);
2043 goto failed_mount3;
2044 }
2045 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2046 iput(root);
2047 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
2048 goto failed_mount3;
2049 }
2050 sb->s_root = d_make_root(root);
2051 if (!sb->s_root) {
2052 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
2053 ret = -ENOMEM;
2054 goto failed_mount3;
2055 }
2056
2057 if (ext3_setup_super(sb, es, sb->s_flags & MS_RDONLY))
2058 sb->s_flags |= MS_RDONLY;
2059
2060 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2061 ext3_orphan_cleanup(sb, es);
2062 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2063 if (needs_recovery) {
2064 ext3_mark_recovery_complete(sb, es);
2065 ext3_msg(sb, KERN_INFO, "recovery complete");
2066 }
2067 ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
2068 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2069 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2070 "writeback");
2071
2072 return 0;
2073
2074 cantfind_ext3:
2075 if (!silent)
2076 ext3_msg(sb, KERN_INFO,
2077 "error: can't find ext3 filesystem on dev %s.",
2078 sb->s_id);
2079 goto failed_mount;
2080
2081 failed_mount3:
2082 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2083 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2084 percpu_counter_destroy(&sbi->s_dirs_counter);
2085 journal_destroy(sbi->s_journal);
2086 failed_mount2:
2087 for (i = 0; i < db_count; i++)
2088 brelse(sbi->s_group_desc[i]);
2089 kfree(sbi->s_group_desc);
2090 failed_mount:
2091 #ifdef CONFIG_QUOTA
2092 for (i = 0; i < MAXQUOTAS; i++)
2093 kfree(sbi->s_qf_names[i]);
2094 #endif
2095 ext3_blkdev_remove(sbi);
2096 brelse(bh);
2097 out_fail:
2098 sb->s_fs_info = NULL;
2099 kfree(sbi->s_blockgroup_lock);
2100 kfree(sbi);
2101 return ret;
2102 }
2103
2104 /*
2105 * Setup any per-fs journal parameters now. We'll do this both on
2106 * initial mount, once the journal has been initialised but before we've
2107 * done any recovery; and again on any subsequent remount.
2108 */
2109 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2110 {
2111 struct ext3_sb_info *sbi = EXT3_SB(sb);
2112
2113 if (sbi->s_commit_interval)
2114 journal->j_commit_interval = sbi->s_commit_interval;
2115 /* We could also set up an ext3-specific default for the commit
2116 * interval here, but for now we'll just fall back to the jbd
2117 * default. */
2118
2119 spin_lock(&journal->j_state_lock);
2120 if (test_opt(sb, BARRIER))
2121 journal->j_flags |= JFS_BARRIER;
2122 else
2123 journal->j_flags &= ~JFS_BARRIER;
2124 if (test_opt(sb, DATA_ERR_ABORT))
2125 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2126 else
2127 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2128 spin_unlock(&journal->j_state_lock);
2129 }
2130
2131 static journal_t *ext3_get_journal(struct super_block *sb,
2132 unsigned int journal_inum)
2133 {
2134 struct inode *journal_inode;
2135 journal_t *journal;
2136
2137 /* First, test for the existence of a valid inode on disk. Bad
2138 * things happen if we iget() an unused inode, as the subsequent
2139 * iput() will try to delete it. */
2140
2141 journal_inode = ext3_iget(sb, journal_inum);
2142 if (IS_ERR(journal_inode)) {
2143 ext3_msg(sb, KERN_ERR, "error: no journal found");
2144 return NULL;
2145 }
2146 if (!journal_inode->i_nlink) {
2147 make_bad_inode(journal_inode);
2148 iput(journal_inode);
2149 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
2150 return NULL;
2151 }
2152
2153 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2154 journal_inode, journal_inode->i_size);
2155 if (!S_ISREG(journal_inode->i_mode)) {
2156 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
2157 iput(journal_inode);
2158 return NULL;
2159 }
2160
2161 journal = journal_init_inode(journal_inode);
2162 if (!journal) {
2163 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
2164 iput(journal_inode);
2165 return NULL;
2166 }
2167 journal->j_private = sb;
2168 ext3_init_journal_params(sb, journal);
2169 return journal;
2170 }
2171
2172 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2173 dev_t j_dev)
2174 {
2175 struct buffer_head * bh;
2176 journal_t *journal;
2177 ext3_fsblk_t start;
2178 ext3_fsblk_t len;
2179 int hblock, blocksize;
2180 ext3_fsblk_t sb_block;
2181 unsigned long offset;
2182 struct ext3_super_block * es;
2183 struct block_device *bdev;
2184
2185 bdev = ext3_blkdev_get(j_dev, sb);
2186 if (bdev == NULL)
2187 return NULL;
2188
2189 blocksize = sb->s_blocksize;
2190 hblock = bdev_logical_block_size(bdev);
2191 if (blocksize < hblock) {
2192 ext3_msg(sb, KERN_ERR,
2193 "error: blocksize too small for journal device");
2194 goto out_bdev;
2195 }
2196
2197 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2198 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2199 set_blocksize(bdev, blocksize);
2200 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2201 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2202 "external journal");
2203 goto out_bdev;
2204 }
2205
2206 es = (struct ext3_super_block *) (bh->b_data + offset);
2207 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2208 !(le32_to_cpu(es->s_feature_incompat) &
2209 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2210 ext3_msg(sb, KERN_ERR, "error: external journal has "
2211 "bad superblock");
2212 brelse(bh);
2213 goto out_bdev;
2214 }
2215
2216 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2217 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
2218 brelse(bh);
2219 goto out_bdev;
2220 }
2221
2222 len = le32_to_cpu(es->s_blocks_count);
2223 start = sb_block + 1;
2224 brelse(bh); /* we're done with the superblock */
2225
2226 journal = journal_init_dev(bdev, sb->s_bdev,
2227 start, len, blocksize);
2228 if (!journal) {
2229 ext3_msg(sb, KERN_ERR,
2230 "error: failed to create device journal");
2231 goto out_bdev;
2232 }
2233 journal->j_private = sb;
2234 if (!bh_uptodate_or_lock(journal->j_sb_buffer)) {
2235 if (bh_submit_read(journal->j_sb_buffer)) {
2236 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2237 goto out_journal;
2238 }
2239 }
2240 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2241 ext3_msg(sb, KERN_ERR,
2242 "error: external journal has more than one "
2243 "user (unsupported) - %d",
2244 be32_to_cpu(journal->j_superblock->s_nr_users));
2245 goto out_journal;
2246 }
2247 EXT3_SB(sb)->journal_bdev = bdev;
2248 ext3_init_journal_params(sb, journal);
2249 return journal;
2250 out_journal:
2251 journal_destroy(journal);
2252 out_bdev:
2253 ext3_blkdev_put(bdev);
2254 return NULL;
2255 }
2256
2257 static int ext3_load_journal(struct super_block *sb,
2258 struct ext3_super_block *es,
2259 unsigned long journal_devnum)
2260 {
2261 journal_t *journal;
2262 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2263 dev_t journal_dev;
2264 int err = 0;
2265 int really_read_only;
2266
2267 if (journal_devnum &&
2268 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2269 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2270 "numbers have changed");
2271 journal_dev = new_decode_dev(journal_devnum);
2272 } else
2273 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2274
2275 really_read_only = bdev_read_only(sb->s_bdev);
2276
2277 /*
2278 * Are we loading a blank journal or performing recovery after a
2279 * crash? For recovery, we need to check in advance whether we
2280 * can get read-write access to the device.
2281 */
2282
2283 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2284 if (sb->s_flags & MS_RDONLY) {
2285 ext3_msg(sb, KERN_INFO,
2286 "recovery required on readonly filesystem");
2287 if (really_read_only) {
2288 ext3_msg(sb, KERN_ERR, "error: write access "
2289 "unavailable, cannot proceed");
2290 return -EROFS;
2291 }
2292 ext3_msg(sb, KERN_INFO,
2293 "write access will be enabled during recovery");
2294 }
2295 }
2296
2297 if (journal_inum && journal_dev) {
2298 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2299 "and inode journals");
2300 return -EINVAL;
2301 }
2302
2303 if (journal_inum) {
2304 if (!(journal = ext3_get_journal(sb, journal_inum)))
2305 return -EINVAL;
2306 } else {
2307 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2308 return -EINVAL;
2309 }
2310
2311 if (!(journal->j_flags & JFS_BARRIER))
2312 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2313
2314 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2315 err = journal_update_format(journal);
2316 if (err) {
2317 ext3_msg(sb, KERN_ERR, "error updating journal");
2318 journal_destroy(journal);
2319 return err;
2320 }
2321 }
2322
2323 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2324 err = journal_wipe(journal, !really_read_only);
2325 if (!err)
2326 err = journal_load(journal);
2327
2328 if (err) {
2329 ext3_msg(sb, KERN_ERR, "error loading journal");
2330 journal_destroy(journal);
2331 return err;
2332 }
2333
2334 EXT3_SB(sb)->s_journal = journal;
2335 ext3_clear_journal_err(sb, es);
2336
2337 if (!really_read_only && journal_devnum &&
2338 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2339 es->s_journal_dev = cpu_to_le32(journal_devnum);
2340
2341 /* Make sure we flush the recovery flag to disk. */
2342 ext3_commit_super(sb, es, 1);
2343 }
2344
2345 return 0;
2346 }
2347
2348 static int ext3_create_journal(struct super_block *sb,
2349 struct ext3_super_block *es,
2350 unsigned int journal_inum)
2351 {
2352 journal_t *journal;
2353 int err;
2354
2355 if (sb->s_flags & MS_RDONLY) {
2356 ext3_msg(sb, KERN_ERR,
2357 "error: readonly filesystem when trying to "
2358 "create journal");
2359 return -EROFS;
2360 }
2361
2362 journal = ext3_get_journal(sb, journal_inum);
2363 if (!journal)
2364 return -EINVAL;
2365
2366 ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
2367 journal_inum);
2368
2369 err = journal_create(journal);
2370 if (err) {
2371 ext3_msg(sb, KERN_ERR, "error creating journal");
2372 journal_destroy(journal);
2373 return -EIO;
2374 }
2375
2376 EXT3_SB(sb)->s_journal = journal;
2377
2378 ext3_update_dynamic_rev(sb);
2379 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2380 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2381
2382 es->s_journal_inum = cpu_to_le32(journal_inum);
2383
2384 /* Make sure we flush the recovery flag to disk. */
2385 ext3_commit_super(sb, es, 1);
2386
2387 return 0;
2388 }
2389
2390 static int ext3_commit_super(struct super_block *sb,
2391 struct ext3_super_block *es,
2392 int sync)
2393 {
2394 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2395 int error = 0;
2396
2397 if (!sbh)
2398 return error;
2399
2400 if (buffer_write_io_error(sbh)) {
2401 /*
2402 * Oh, dear. A previous attempt to write the
2403 * superblock failed. This could happen because the
2404 * USB device was yanked out. Or it could happen to
2405 * be a transient write error and maybe the block will
2406 * be remapped. Nothing we can do but to retry the
2407 * write and hope for the best.
2408 */
2409 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2410 "superblock detected");
2411 clear_buffer_write_io_error(sbh);
2412 set_buffer_uptodate(sbh);
2413 }
2414 /*
2415 * If the file system is mounted read-only, don't update the
2416 * superblock write time. This avoids updating the superblock
2417 * write time when we are mounting the root file system
2418 * read/only but we need to replay the journal; at that point,
2419 * for people who are east of GMT and who make their clock
2420 * tick in localtime for Windows bug-for-bug compatibility,
2421 * the clock is set in the future, and this will cause e2fsck
2422 * to complain and force a full file system check.
2423 */
2424 if (!(sb->s_flags & MS_RDONLY))
2425 es->s_wtime = cpu_to_le32(get_seconds());
2426 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2427 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2428 BUFFER_TRACE(sbh, "marking dirty");
2429 mark_buffer_dirty(sbh);
2430 if (sync) {
2431 error = sync_dirty_buffer(sbh);
2432 if (buffer_write_io_error(sbh)) {
2433 ext3_msg(sb, KERN_ERR, "I/O error while writing "
2434 "superblock");
2435 clear_buffer_write_io_error(sbh);
2436 set_buffer_uptodate(sbh);
2437 }
2438 }
2439 return error;
2440 }
2441
2442
2443 /*
2444 * Have we just finished recovery? If so, and if we are mounting (or
2445 * remounting) the filesystem readonly, then we will end up with a
2446 * consistent fs on disk. Record that fact.
2447 */
2448 static void ext3_mark_recovery_complete(struct super_block * sb,
2449 struct ext3_super_block * es)
2450 {
2451 journal_t *journal = EXT3_SB(sb)->s_journal;
2452
2453 journal_lock_updates(journal);
2454 if (journal_flush(journal) < 0)
2455 goto out;
2456
2457 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2458 sb->s_flags & MS_RDONLY) {
2459 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2460 ext3_commit_super(sb, es, 1);
2461 }
2462
2463 out:
2464 journal_unlock_updates(journal);
2465 }
2466
2467 /*
2468 * If we are mounting (or read-write remounting) a filesystem whose journal
2469 * has recorded an error from a previous lifetime, move that error to the
2470 * main filesystem now.
2471 */
2472 static void ext3_clear_journal_err(struct super_block *sb,
2473 struct ext3_super_block *es)
2474 {
2475 journal_t *journal;
2476 int j_errno;
2477 const char *errstr;
2478
2479 journal = EXT3_SB(sb)->s_journal;
2480
2481 /*
2482 * Now check for any error status which may have been recorded in the
2483 * journal by a prior ext3_error() or ext3_abort()
2484 */
2485
2486 j_errno = journal_errno(journal);
2487 if (j_errno) {
2488 char nbuf[16];
2489
2490 errstr = ext3_decode_error(sb, j_errno, nbuf);
2491 ext3_warning(sb, __func__, "Filesystem error recorded "
2492 "from previous mount: %s", errstr);
2493 ext3_warning(sb, __func__, "Marking fs in need of "
2494 "filesystem check.");
2495
2496 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2497 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2498 ext3_commit_super (sb, es, 1);
2499
2500 journal_clear_err(journal);
2501 }
2502 }
2503
2504 /*
2505 * Force the running and committing transactions to commit,
2506 * and wait on the commit.
2507 */
2508 int ext3_force_commit(struct super_block *sb)
2509 {
2510 journal_t *journal;
2511 int ret;
2512
2513 if (sb->s_flags & MS_RDONLY)
2514 return 0;
2515
2516 journal = EXT3_SB(sb)->s_journal;
2517 ret = ext3_journal_force_commit(journal);
2518 return ret;
2519 }
2520
2521 static int ext3_sync_fs(struct super_block *sb, int wait)
2522 {
2523 tid_t target;
2524
2525 trace_ext3_sync_fs(sb, wait);
2526 /*
2527 * Writeback quota in non-journalled quota case - journalled quota has
2528 * no dirty dquots
2529 */
2530 dquot_writeback_dquots(sb, -1);
2531 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2532 if (wait)
2533 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2534 }
2535 return 0;
2536 }
2537
2538 /*
2539 * LVM calls this function before a (read-only) snapshot is created. This
2540 * gives us a chance to flush the journal completely and mark the fs clean.
2541 */
2542 static int ext3_freeze(struct super_block *sb)
2543 {
2544 int error = 0;
2545 journal_t *journal;
2546
2547 if (!(sb->s_flags & MS_RDONLY)) {
2548 journal = EXT3_SB(sb)->s_journal;
2549
2550 /* Now we set up the journal barrier. */
2551 journal_lock_updates(journal);
2552
2553 /*
2554 * We don't want to clear needs_recovery flag when we failed
2555 * to flush the journal.
2556 */
2557 error = journal_flush(journal);
2558 if (error < 0)
2559 goto out;
2560
2561 /* Journal blocked and flushed, clear needs_recovery flag. */
2562 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2563 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2564 if (error)
2565 goto out;
2566 }
2567 return 0;
2568
2569 out:
2570 journal_unlock_updates(journal);
2571 return error;
2572 }
2573
2574 /*
2575 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2576 * flag here, even though the filesystem is not technically dirty yet.
2577 */
2578 static int ext3_unfreeze(struct super_block *sb)
2579 {
2580 if (!(sb->s_flags & MS_RDONLY)) {
2581 lock_super(sb);
2582 /* Reser the needs_recovery flag before the fs is unlocked. */
2583 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2584 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2585 unlock_super(sb);
2586 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2587 }
2588 return 0;
2589 }
2590
2591 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2592 {
2593 struct ext3_super_block * es;
2594 struct ext3_sb_info *sbi = EXT3_SB(sb);
2595 ext3_fsblk_t n_blocks_count = 0;
2596 unsigned long old_sb_flags;
2597 struct ext3_mount_options old_opts;
2598 int enable_quota = 0;
2599 int err;
2600 #ifdef CONFIG_QUOTA
2601 int i;
2602 #endif
2603
2604 /* Store the original options */
2605 lock_super(sb);
2606 old_sb_flags = sb->s_flags;
2607 old_opts.s_mount_opt = sbi->s_mount_opt;
2608 old_opts.s_resuid = sbi->s_resuid;
2609 old_opts.s_resgid = sbi->s_resgid;
2610 old_opts.s_commit_interval = sbi->s_commit_interval;
2611 #ifdef CONFIG_QUOTA
2612 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2613 for (i = 0; i < MAXQUOTAS; i++)
2614 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2615 #endif
2616
2617 /*
2618 * Allow the "check" option to be passed as a remount option.
2619 */
2620 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2621 err = -EINVAL;
2622 goto restore_opts;
2623 }
2624
2625 if (test_opt(sb, ABORT))
2626 ext3_abort(sb, __func__, "Abort forced by user");
2627
2628 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2629 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2630
2631 es = sbi->s_es;
2632
2633 ext3_init_journal_params(sb, sbi->s_journal);
2634
2635 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2636 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2637 if (test_opt(sb, ABORT)) {
2638 err = -EROFS;
2639 goto restore_opts;
2640 }
2641
2642 if (*flags & MS_RDONLY) {
2643 err = dquot_suspend(sb, -1);
2644 if (err < 0)
2645 goto restore_opts;
2646
2647 /*
2648 * First of all, the unconditional stuff we have to do
2649 * to disable replay of the journal when we next remount
2650 */
2651 sb->s_flags |= MS_RDONLY;
2652
2653 /*
2654 * OK, test if we are remounting a valid rw partition
2655 * readonly, and if so set the rdonly flag and then
2656 * mark the partition as valid again.
2657 */
2658 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2659 (sbi->s_mount_state & EXT3_VALID_FS))
2660 es->s_state = cpu_to_le16(sbi->s_mount_state);
2661
2662 ext3_mark_recovery_complete(sb, es);
2663 } else {
2664 __le32 ret;
2665 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2666 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2667 ext3_msg(sb, KERN_WARNING,
2668 "warning: couldn't remount RDWR "
2669 "because of unsupported optional "
2670 "features (%x)", le32_to_cpu(ret));
2671 err = -EROFS;
2672 goto restore_opts;
2673 }
2674
2675 /*
2676 * If we have an unprocessed orphan list hanging
2677 * around from a previously readonly bdev mount,
2678 * require a full umount & mount for now.
2679 */
2680 if (es->s_last_orphan) {
2681 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
2682 "remount RDWR because of unprocessed "
2683 "orphan inode list. Please "
2684 "umount & mount instead.");
2685 err = -EINVAL;
2686 goto restore_opts;
2687 }
2688
2689 /*
2690 * Mounting a RDONLY partition read-write, so reread
2691 * and store the current valid flag. (It may have
2692 * been changed by e2fsck since we originally mounted
2693 * the partition.)
2694 */
2695 ext3_clear_journal_err(sb, es);
2696 sbi->s_mount_state = le16_to_cpu(es->s_state);
2697 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2698 goto restore_opts;
2699 if (!ext3_setup_super (sb, es, 0))
2700 sb->s_flags &= ~MS_RDONLY;
2701 enable_quota = 1;
2702 }
2703 }
2704 #ifdef CONFIG_QUOTA
2705 /* Release old quota file names */
2706 for (i = 0; i < MAXQUOTAS; i++)
2707 if (old_opts.s_qf_names[i] &&
2708 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2709 kfree(old_opts.s_qf_names[i]);
2710 #endif
2711 unlock_super(sb);
2712
2713 if (enable_quota)
2714 dquot_resume(sb, -1);
2715 return 0;
2716 restore_opts:
2717 sb->s_flags = old_sb_flags;
2718 sbi->s_mount_opt = old_opts.s_mount_opt;
2719 sbi->s_resuid = old_opts.s_resuid;
2720 sbi->s_resgid = old_opts.s_resgid;
2721 sbi->s_commit_interval = old_opts.s_commit_interval;
2722 #ifdef CONFIG_QUOTA
2723 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2724 for (i = 0; i < MAXQUOTAS; i++) {
2725 if (sbi->s_qf_names[i] &&
2726 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2727 kfree(sbi->s_qf_names[i]);
2728 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2729 }
2730 #endif
2731 unlock_super(sb);
2732 return err;
2733 }
2734
2735 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2736 {
2737 struct super_block *sb = dentry->d_sb;
2738 struct ext3_sb_info *sbi = EXT3_SB(sb);
2739 struct ext3_super_block *es = sbi->s_es;
2740 u64 fsid;
2741
2742 if (test_opt(sb, MINIX_DF)) {
2743 sbi->s_overhead_last = 0;
2744 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2745 unsigned long ngroups = sbi->s_groups_count, i;
2746 ext3_fsblk_t overhead = 0;
2747 smp_rmb();
2748
2749 /*
2750 * Compute the overhead (FS structures). This is constant
2751 * for a given filesystem unless the number of block groups
2752 * changes so we cache the previous value until it does.
2753 */
2754
2755 /*
2756 * All of the blocks before first_data_block are
2757 * overhead
2758 */
2759 overhead = le32_to_cpu(es->s_first_data_block);
2760
2761 /*
2762 * Add the overhead attributed to the superblock and
2763 * block group descriptors. If the sparse superblocks
2764 * feature is turned on, then not all groups have this.
2765 */
2766 for (i = 0; i < ngroups; i++) {
2767 overhead += ext3_bg_has_super(sb, i) +
2768 ext3_bg_num_gdb(sb, i);
2769 cond_resched();
2770 }
2771
2772 /*
2773 * Every block group has an inode bitmap, a block
2774 * bitmap, and an inode table.
2775 */
2776 overhead += ngroups * (2 + sbi->s_itb_per_group);
2777 sbi->s_overhead_last = overhead;
2778 smp_wmb();
2779 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2780 }
2781
2782 buf->f_type = EXT3_SUPER_MAGIC;
2783 buf->f_bsize = sb->s_blocksize;
2784 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2785 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2786 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2787 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2788 buf->f_bavail = 0;
2789 buf->f_files = le32_to_cpu(es->s_inodes_count);
2790 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2791 buf->f_namelen = EXT3_NAME_LEN;
2792 fsid = le64_to_cpup((void *)es->s_uuid) ^
2793 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2794 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2795 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2796 return 0;
2797 }
2798
2799 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2800 * is locked for write. Otherwise the are possible deadlocks:
2801 * Process 1 Process 2
2802 * ext3_create() quota_sync()
2803 * journal_start() write_dquot()
2804 * dquot_initialize() down(dqio_mutex)
2805 * down(dqio_mutex) journal_start()
2806 *
2807 */
2808
2809 #ifdef CONFIG_QUOTA
2810
2811 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2812 {
2813 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
2814 }
2815
2816 static int ext3_write_dquot(struct dquot *dquot)
2817 {
2818 int ret, err;
2819 handle_t *handle;
2820 struct inode *inode;
2821
2822 inode = dquot_to_inode(dquot);
2823 handle = ext3_journal_start(inode,
2824 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2825 if (IS_ERR(handle))
2826 return PTR_ERR(handle);
2827 ret = dquot_commit(dquot);
2828 err = ext3_journal_stop(handle);
2829 if (!ret)
2830 ret = err;
2831 return ret;
2832 }
2833
2834 static int ext3_acquire_dquot(struct dquot *dquot)
2835 {
2836 int ret, err;
2837 handle_t *handle;
2838
2839 handle = ext3_journal_start(dquot_to_inode(dquot),
2840 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2841 if (IS_ERR(handle))
2842 return PTR_ERR(handle);
2843 ret = dquot_acquire(dquot);
2844 err = ext3_journal_stop(handle);
2845 if (!ret)
2846 ret = err;
2847 return ret;
2848 }
2849
2850 static int ext3_release_dquot(struct dquot *dquot)
2851 {
2852 int ret, err;
2853 handle_t *handle;
2854
2855 handle = ext3_journal_start(dquot_to_inode(dquot),
2856 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2857 if (IS_ERR(handle)) {
2858 /* Release dquot anyway to avoid endless cycle in dqput() */
2859 dquot_release(dquot);
2860 return PTR_ERR(handle);
2861 }
2862 ret = dquot_release(dquot);
2863 err = ext3_journal_stop(handle);
2864 if (!ret)
2865 ret = err;
2866 return ret;
2867 }
2868
2869 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2870 {
2871 /* Are we journaling quotas? */
2872 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2873 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2874 dquot_mark_dquot_dirty(dquot);
2875 return ext3_write_dquot(dquot);
2876 } else {
2877 return dquot_mark_dquot_dirty(dquot);
2878 }
2879 }
2880
2881 static int ext3_write_info(struct super_block *sb, int type)
2882 {
2883 int ret, err;
2884 handle_t *handle;
2885
2886 /* Data block + inode block */
2887 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2888 if (IS_ERR(handle))
2889 return PTR_ERR(handle);
2890 ret = dquot_commit_info(sb, type);
2891 err = ext3_journal_stop(handle);
2892 if (!ret)
2893 ret = err;
2894 return ret;
2895 }
2896
2897 /*
2898 * Turn on quotas during mount time - we need to find
2899 * the quota file and such...
2900 */
2901 static int ext3_quota_on_mount(struct super_block *sb, int type)
2902 {
2903 return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2904 EXT3_SB(sb)->s_jquota_fmt, type);
2905 }
2906
2907 /*
2908 * Standard function to be called on quota_on
2909 */
2910 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2911 struct path *path)
2912 {
2913 int err;
2914
2915 if (!test_opt(sb, QUOTA))
2916 return -EINVAL;
2917
2918 /* Quotafile not on the same filesystem? */
2919 if (path->dentry->d_sb != sb)
2920 return -EXDEV;
2921 /* Journaling quota? */
2922 if (EXT3_SB(sb)->s_qf_names[type]) {
2923 /* Quotafile not of fs root? */
2924 if (path->dentry->d_parent != sb->s_root)
2925 ext3_msg(sb, KERN_WARNING,
2926 "warning: Quota file not on filesystem root. "
2927 "Journaled quota will not work.");
2928 }
2929
2930 /*
2931 * When we journal data on quota file, we have to flush journal to see
2932 * all updates to the file when we bypass pagecache...
2933 */
2934 if (ext3_should_journal_data(path->dentry->d_inode)) {
2935 /*
2936 * We don't need to lock updates but journal_flush() could
2937 * otherwise be livelocked...
2938 */
2939 journal_lock_updates(EXT3_SB(sb)->s_journal);
2940 err = journal_flush(EXT3_SB(sb)->s_journal);
2941 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2942 if (err)
2943 return err;
2944 }
2945
2946 return dquot_quota_on(sb, type, format_id, path);
2947 }
2948
2949 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2950 * acquiring the locks... As quota files are never truncated and quota code
2951 * itself serializes the operations (and no one else should touch the files)
2952 * we don't have to be afraid of races */
2953 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2954 size_t len, loff_t off)
2955 {
2956 struct inode *inode = sb_dqopt(sb)->files[type];
2957 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2958 int err = 0;
2959 int offset = off & (sb->s_blocksize - 1);
2960 int tocopy;
2961 size_t toread;
2962 struct buffer_head *bh;
2963 loff_t i_size = i_size_read(inode);
2964
2965 if (off > i_size)
2966 return 0;
2967 if (off+len > i_size)
2968 len = i_size-off;
2969 toread = len;
2970 while (toread > 0) {
2971 tocopy = sb->s_blocksize - offset < toread ?
2972 sb->s_blocksize - offset : toread;
2973 bh = ext3_bread(NULL, inode, blk, 0, &err);
2974 if (err)
2975 return err;
2976 if (!bh) /* A hole? */
2977 memset(data, 0, tocopy);
2978 else
2979 memcpy(data, bh->b_data+offset, tocopy);
2980 brelse(bh);
2981 offset = 0;
2982 toread -= tocopy;
2983 data += tocopy;
2984 blk++;
2985 }
2986 return len;
2987 }
2988
2989 /* Write to quotafile (we know the transaction is already started and has
2990 * enough credits) */
2991 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2992 const char *data, size_t len, loff_t off)
2993 {
2994 struct inode *inode = sb_dqopt(sb)->files[type];
2995 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2996 int err = 0;
2997 int offset = off & (sb->s_blocksize - 1);
2998 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2999 struct buffer_head *bh;
3000 handle_t *handle = journal_current_handle();
3001
3002 if (!handle) {
3003 ext3_msg(sb, KERN_WARNING,
3004 "warning: quota write (off=%llu, len=%llu)"
3005 " cancelled because transaction is not started.",
3006 (unsigned long long)off, (unsigned long long)len);
3007 return -EIO;
3008 }
3009
3010 /*
3011 * Since we account only one data block in transaction credits,
3012 * then it is impossible to cross a block boundary.
3013 */
3014 if (sb->s_blocksize - offset < len) {
3015 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3016 " cancelled because not block aligned",
3017 (unsigned long long)off, (unsigned long long)len);
3018 return -EIO;
3019 }
3020 bh = ext3_bread(handle, inode, blk, 1, &err);
3021 if (!bh)
3022 goto out;
3023 if (journal_quota) {
3024 err = ext3_journal_get_write_access(handle, bh);
3025 if (err) {
3026 brelse(bh);
3027 goto out;
3028 }
3029 }
3030 lock_buffer(bh);
3031 memcpy(bh->b_data+offset, data, len);
3032 flush_dcache_page(bh->b_page);
3033 unlock_buffer(bh);
3034 if (journal_quota)
3035 err = ext3_journal_dirty_metadata(handle, bh);
3036 else {
3037 /* Always do at least ordered writes for quotas */
3038 err = ext3_journal_dirty_data(handle, bh);
3039 mark_buffer_dirty(bh);
3040 }
3041 brelse(bh);
3042 out:
3043 if (err)
3044 return err;
3045 if (inode->i_size < off + len) {
3046 i_size_write(inode, off + len);
3047 EXT3_I(inode)->i_disksize = inode->i_size;
3048 }
3049 inode->i_version++;
3050 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3051 ext3_mark_inode_dirty(handle, inode);
3052 return len;
3053 }
3054
3055 #endif
3056
3057 static struct dentry *ext3_mount(struct file_system_type *fs_type,
3058 int flags, const char *dev_name, void *data)
3059 {
3060 return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
3061 }
3062
3063 static struct file_system_type ext3_fs_type = {
3064 .owner = THIS_MODULE,
3065 .name = "ext3",
3066 .mount = ext3_mount,
3067 .kill_sb = kill_block_super,
3068 .fs_flags = FS_REQUIRES_DEV,
3069 };
3070
3071 static int __init init_ext3_fs(void)
3072 {
3073 int err = init_ext3_xattr();
3074 if (err)
3075 return err;
3076 err = init_inodecache();
3077 if (err)
3078 goto out1;
3079 err = register_filesystem(&ext3_fs_type);
3080 if (err)
3081 goto out;
3082 return 0;
3083 out:
3084 destroy_inodecache();
3085 out1:
3086 exit_ext3_xattr();
3087 return err;
3088 }
3089
3090 static void __exit exit_ext3_fs(void)
3091 {
3092 unregister_filesystem(&ext3_fs_type);
3093 destroy_inodecache();
3094 exit_ext3_xattr();
3095 }
3096
3097 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3098 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3099 MODULE_LICENSE("GPL");
3100 module_init(init_ext3_fs)
3101 module_exit(exit_ext3_fs)
kernel source for telekom puls (alcatel/mediatek)