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genirq: Prevent potential NULL dereference in irq_set_irq_wake()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ext3 / super.c
blobaad153ef6b783a6820e9f38e60d61d6cbea2c8eb
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/string.h>
21 #include <linux/fs.h>
22 #include <linux/time.h>
23 #include <linux/jbd.h>
24 #include <linux/ext3_fs.h>
25 #include <linux/ext3_jbd.h>
26 #include <linux/slab.h>
27 #include <linux/init.h>
28 #include <linux/blkdev.h>
29 #include <linux/parser.h>
30 #include <linux/buffer_head.h>
31 #include <linux/exportfs.h>
32 #include <linux/vfs.h>
33 #include <linux/random.h>
34 #include <linux/mount.h>
35 #include <linux/namei.h>
36 #include <linux/quotaops.h>
37 #include <linux/seq_file.h>
38 #include <linux/log2.h>
39 #include <linux/cleancache.h>
40
41 #include <asm/uaccess.h>
42
43 #include "xattr.h"
44 #include "acl.h"
45 #include "namei.h"
46
47 #ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
48 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
49 #else
50 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
51 #endif
52
53 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
54 unsigned long journal_devnum);
55 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
56 unsigned int);
57 static int ext3_commit_super(struct super_block *sb,
58 struct ext3_super_block *es,
59 int sync);
60 static void ext3_mark_recovery_complete(struct super_block * sb,
61 struct ext3_super_block * es);
62 static void ext3_clear_journal_err(struct super_block * sb,
63 struct ext3_super_block * es);
64 static int ext3_sync_fs(struct super_block *sb, int wait);
65 static const char *ext3_decode_error(struct super_block * sb, int errno,
66 char nbuf[16]);
67 static int ext3_remount (struct super_block * sb, int * flags, char * data);
68 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
69 static int ext3_unfreeze(struct super_block *sb);
70 static int ext3_freeze(struct super_block *sb);
71
72 /*
73 * Wrappers for journal_start/end.
74 *
75 * The only special thing we need to do here is to make sure that all
76 * journal_end calls result in the superblock being marked dirty, so
77 * that sync() will call the filesystem's write_super callback if
78 * appropriate.
79 */
80 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
81 {
82 journal_t *journal;
83
84 if (sb->s_flags & MS_RDONLY)
85 return ERR_PTR(-EROFS);
86
87 /* Special case here: if the journal has aborted behind our
88 * backs (eg. EIO in the commit thread), then we still need to
89 * take the FS itself readonly cleanly. */
90 journal = EXT3_SB(sb)->s_journal;
91 if (is_journal_aborted(journal)) {
92 ext3_abort(sb, __func__,
93 "Detected aborted journal");
94 return ERR_PTR(-EROFS);
95 }
96
97 return journal_start(journal, nblocks);
98 }
99
100 /*
101 * The only special thing we need to do here is to make sure that all
102 * journal_stop calls result in the superblock being marked dirty, so
103 * that sync() will call the filesystem's write_super callback if
104 * appropriate.
105 */
106 int __ext3_journal_stop(const char *where, handle_t *handle)
107 {
108 struct super_block *sb;
109 int err;
110 int rc;
111
112 sb = handle->h_transaction->t_journal->j_private;
113 err = handle->h_err;
114 rc = journal_stop(handle);
115
116 if (!err)
117 err = rc;
118 if (err)
119 __ext3_std_error(sb, where, err);
120 return err;
121 }
122
123 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
124 struct buffer_head *bh, handle_t *handle, int err)
125 {
126 char nbuf[16];
127 const char *errstr = ext3_decode_error(NULL, err, nbuf);
128
129 if (bh)
130 BUFFER_TRACE(bh, "abort");
131
132 if (!handle->h_err)
133 handle->h_err = err;
134
135 if (is_handle_aborted(handle))
136 return;
137
138 printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
139 caller, errstr, err_fn);
140
141 journal_abort_handle(handle);
142 }
143
144 void ext3_msg(struct super_block *sb, const char *prefix,
145 const char *fmt, ...)
146 {
147 struct va_format vaf;
148 va_list args;
149
150 va_start(args, fmt);
151
152 vaf.fmt = fmt;
153 vaf.va = &args;
154
155 printk("%sEXT3-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
156
157 va_end(args);
158 }
159
160 /* Deal with the reporting of failure conditions on a filesystem such as
161 * inconsistencies detected or read IO failures.
162 *
163 * On ext2, we can store the error state of the filesystem in the
164 * superblock. That is not possible on ext3, because we may have other
165 * write ordering constraints on the superblock which prevent us from
166 * writing it out straight away; and given that the journal is about to
167 * be aborted, we can't rely on the current, or future, transactions to
168 * write out the superblock safely.
169 *
170 * We'll just use the journal_abort() error code to record an error in
171 * the journal instead. On recovery, the journal will complain about
172 * that error until we've noted it down and cleared it.
173 */
174
175 static void ext3_handle_error(struct super_block *sb)
176 {
177 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
178
179 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
180 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
181
182 if (sb->s_flags & MS_RDONLY)
183 return;
184
185 if (!test_opt (sb, ERRORS_CONT)) {
186 journal_t *journal = EXT3_SB(sb)->s_journal;
187
188 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
189 if (journal)
190 journal_abort(journal, -EIO);
191 }
192 if (test_opt (sb, ERRORS_RO)) {
193 ext3_msg(sb, KERN_CRIT,
194 "error: remounting filesystem read-only");
195 sb->s_flags |= MS_RDONLY;
196 }
197 ext3_commit_super(sb, es, 1);
198 if (test_opt(sb, ERRORS_PANIC))
199 panic("EXT3-fs (%s): panic forced after error\n",
200 sb->s_id);
201 }
202
203 void ext3_error(struct super_block *sb, const char *function,
204 const char *fmt, ...)
205 {
206 struct va_format vaf;
207 va_list args;
208
209 va_start(args, fmt);
210
211 vaf.fmt = fmt;
212 vaf.va = &args;
213
214 printk(KERN_CRIT "EXT3-fs error (device %s): %s: %pV\n",
215 sb->s_id, function, &vaf);
216
217 va_end(args);
218
219 ext3_handle_error(sb);
220 }
221
222 static const char *ext3_decode_error(struct super_block * sb, int errno,
223 char nbuf[16])
224 {
225 char *errstr = NULL;
226
227 switch (errno) {
228 case -EIO:
229 errstr = "IO failure";
230 break;
231 case -ENOMEM:
232 errstr = "Out of memory";
233 break;
234 case -EROFS:
235 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
236 errstr = "Journal has aborted";
237 else
238 errstr = "Readonly filesystem";
239 break;
240 default:
241 /* If the caller passed in an extra buffer for unknown
242 * errors, textualise them now. Else we just return
243 * NULL. */
244 if (nbuf) {
245 /* Check for truncated error codes... */
246 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
247 errstr = nbuf;
248 }
249 break;
250 }
251
252 return errstr;
253 }
254
255 /* __ext3_std_error decodes expected errors from journaling functions
256 * automatically and invokes the appropriate error response. */
257
258 void __ext3_std_error (struct super_block * sb, const char * function,
259 int errno)
260 {
261 char nbuf[16];
262 const char *errstr;
263
264 /* Special case: if the error is EROFS, and we're not already
265 * inside a transaction, then there's really no point in logging
266 * an error. */
267 if (errno == -EROFS && journal_current_handle() == NULL &&
268 (sb->s_flags & MS_RDONLY))
269 return;
270
271 errstr = ext3_decode_error(sb, errno, nbuf);
272 ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
273
274 ext3_handle_error(sb);
275 }
276
277 /*
278 * ext3_abort is a much stronger failure handler than ext3_error. The
279 * abort function may be used to deal with unrecoverable failures such
280 * as journal IO errors or ENOMEM at a critical moment in log management.
281 *
282 * We unconditionally force the filesystem into an ABORT|READONLY state,
283 * unless the error response on the fs has been set to panic in which
284 * case we take the easy way out and panic immediately.
285 */
286
287 void ext3_abort(struct super_block *sb, const char *function,
288 const char *fmt, ...)
289 {
290 struct va_format vaf;
291 va_list args;
292
293 va_start(args, fmt);
294
295 vaf.fmt = fmt;
296 vaf.va = &args;
297
298 printk(KERN_CRIT "EXT3-fs (%s): error: %s: %pV\n",
299 sb->s_id, function, &vaf);
300
301 va_end(args);
302
303 if (test_opt(sb, ERRORS_PANIC))
304 panic("EXT3-fs: panic from previous error\n");
305
306 if (sb->s_flags & MS_RDONLY)
307 return;
308
309 ext3_msg(sb, KERN_CRIT,
310 "error: remounting filesystem read-only");
311 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
312 sb->s_flags |= MS_RDONLY;
313 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
314 if (EXT3_SB(sb)->s_journal)
315 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
316 }
317
318 void ext3_warning(struct super_block *sb, const char *function,
319 const char *fmt, ...)
320 {
321 struct va_format vaf;
322 va_list args;
323
324 va_start(args, fmt);
325
326 vaf.fmt = fmt;
327 vaf.va = &args;
328
329 printk(KERN_WARNING "EXT3-fs (%s): warning: %s: %pV\n",
330 sb->s_id, function, &vaf);
331
332 va_end(args);
333 }
334
335 void ext3_update_dynamic_rev(struct super_block *sb)
336 {
337 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
338
339 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
340 return;
341
342 ext3_msg(sb, KERN_WARNING,
343 "warning: updating to rev %d because of "
344 "new feature flag, running e2fsck is recommended",
345 EXT3_DYNAMIC_REV);
346
347 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
348 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
349 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
350 /* leave es->s_feature_*compat flags alone */
351 /* es->s_uuid will be set by e2fsck if empty */
352
353 /*
354 * The rest of the superblock fields should be zero, and if not it
355 * means they are likely already in use, so leave them alone. We
356 * can leave it up to e2fsck to clean up any inconsistencies there.
357 */
358 }
359
360 /*
361 * Open the external journal device
362 */
363 static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
364 {
365 struct block_device *bdev;
366 char b[BDEVNAME_SIZE];
367
368 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
369 if (IS_ERR(bdev))
370 goto fail;
371 return bdev;
372
373 fail:
374 ext3_msg(sb, "error: failed to open journal device %s: %ld",
375 __bdevname(dev, b), PTR_ERR(bdev));
376
377 return NULL;
378 }
379
380 /*
381 * Release the journal device
382 */
383 static int ext3_blkdev_put(struct block_device *bdev)
384 {
385 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
386 }
387
388 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
389 {
390 struct block_device *bdev;
391 int ret = -ENODEV;
392
393 bdev = sbi->journal_bdev;
394 if (bdev) {
395 ret = ext3_blkdev_put(bdev);
396 sbi->journal_bdev = NULL;
397 }
398 return ret;
399 }
400
401 static inline struct inode *orphan_list_entry(struct list_head *l)
402 {
403 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
404 }
405
406 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
407 {
408 struct list_head *l;
409
410 ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
411 le32_to_cpu(sbi->s_es->s_last_orphan));
412
413 ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
414 list_for_each(l, &sbi->s_orphan) {
415 struct inode *inode = orphan_list_entry(l);
416 ext3_msg(sb, KERN_ERR, " "
417 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
418 inode->i_sb->s_id, inode->i_ino, inode,
419 inode->i_mode, inode->i_nlink,
420 NEXT_ORPHAN(inode));
421 }
422 }
423
424 static void ext3_put_super (struct super_block * sb)
425 {
426 struct ext3_sb_info *sbi = EXT3_SB(sb);
427 struct ext3_super_block *es = sbi->s_es;
428 int i, err;
429
430 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
431 ext3_xattr_put_super(sb);
432 err = journal_destroy(sbi->s_journal);
433 sbi->s_journal = NULL;
434 if (err < 0)
435 ext3_abort(sb, __func__, "Couldn't clean up the journal");
436
437 if (!(sb->s_flags & MS_RDONLY)) {
438 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
439 es->s_state = cpu_to_le16(sbi->s_mount_state);
440 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
441 mark_buffer_dirty(sbi->s_sbh);
442 ext3_commit_super(sb, es, 1);
443 }
444
445 for (i = 0; i < sbi->s_gdb_count; i++)
446 brelse(sbi->s_group_desc[i]);
447 kfree(sbi->s_group_desc);
448 percpu_counter_destroy(&sbi->s_freeblocks_counter);
449 percpu_counter_destroy(&sbi->s_freeinodes_counter);
450 percpu_counter_destroy(&sbi->s_dirs_counter);
451 brelse(sbi->s_sbh);
452 #ifdef CONFIG_QUOTA
453 for (i = 0; i < MAXQUOTAS; i++)
454 kfree(sbi->s_qf_names[i]);
455 #endif
456
457 /* Debugging code just in case the in-memory inode orphan list
458 * isn't empty. The on-disk one can be non-empty if we've
459 * detected an error and taken the fs readonly, but the
460 * in-memory list had better be clean by this point. */
461 if (!list_empty(&sbi->s_orphan))
462 dump_orphan_list(sb, sbi);
463 J_ASSERT(list_empty(&sbi->s_orphan));
464
465 invalidate_bdev(sb->s_bdev);
466 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
467 /*
468 * Invalidate the journal device's buffers. We don't want them
469 * floating about in memory - the physical journal device may
470 * hotswapped, and it breaks the `ro-after' testing code.
471 */
472 sync_blockdev(sbi->journal_bdev);
473 invalidate_bdev(sbi->journal_bdev);
474 ext3_blkdev_remove(sbi);
475 }
476 sb->s_fs_info = NULL;
477 kfree(sbi->s_blockgroup_lock);
478 kfree(sbi);
479 }
480
481 static struct kmem_cache *ext3_inode_cachep;
482
483 /*
484 * Called inside transaction, so use GFP_NOFS
485 */
486 static struct inode *ext3_alloc_inode(struct super_block *sb)
487 {
488 struct ext3_inode_info *ei;
489
490 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
491 if (!ei)
492 return NULL;
493 ei->i_block_alloc_info = NULL;
494 ei->vfs_inode.i_version = 1;
495 atomic_set(&ei->i_datasync_tid, 0);
496 atomic_set(&ei->i_sync_tid, 0);
497 return &ei->vfs_inode;
498 }
499
500 static void ext3_i_callback(struct rcu_head *head)
501 {
502 struct inode *inode = container_of(head, struct inode, i_rcu);
503 INIT_LIST_HEAD(&inode->i_dentry);
504 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
505 }
506
507 static void ext3_destroy_inode(struct inode *inode)
508 {
509 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
510 printk("EXT3 Inode %p: orphan list check failed!\n",
511 EXT3_I(inode));
512 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
513 EXT3_I(inode), sizeof(struct ext3_inode_info),
514 false);
515 dump_stack();
516 }
517 call_rcu(&inode->i_rcu, ext3_i_callback);
518 }
519
520 static void init_once(void *foo)
521 {
522 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
523
524 INIT_LIST_HEAD(&ei->i_orphan);
525 #ifdef CONFIG_EXT3_FS_XATTR
526 init_rwsem(&ei->xattr_sem);
527 #endif
528 mutex_init(&ei->truncate_mutex);
529 inode_init_once(&ei->vfs_inode);
530 }
531
532 static int init_inodecache(void)
533 {
534 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
535 sizeof(struct ext3_inode_info),
536 0, (SLAB_RECLAIM_ACCOUNT|
537 SLAB_MEM_SPREAD),
538 init_once);
539 if (ext3_inode_cachep == NULL)
540 return -ENOMEM;
541 return 0;
542 }
543
544 static void destroy_inodecache(void)
545 {
546 kmem_cache_destroy(ext3_inode_cachep);
547 }
548
549 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
550 {
551 #if defined(CONFIG_QUOTA)
552 struct ext3_sb_info *sbi = EXT3_SB(sb);
553
554 if (sbi->s_jquota_fmt) {
555 char *fmtname = "";
556
557 switch (sbi->s_jquota_fmt) {
558 case QFMT_VFS_OLD:
559 fmtname = "vfsold";
560 break;
561 case QFMT_VFS_V0:
562 fmtname = "vfsv0";
563 break;
564 case QFMT_VFS_V1:
565 fmtname = "vfsv1";
566 break;
567 }
568 seq_printf(seq, ",jqfmt=%s", fmtname);
569 }
570
571 if (sbi->s_qf_names[USRQUOTA])
572 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
573
574 if (sbi->s_qf_names[GRPQUOTA])
575 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
576
577 if (test_opt(sb, USRQUOTA))
578 seq_puts(seq, ",usrquota");
579
580 if (test_opt(sb, GRPQUOTA))
581 seq_puts(seq, ",grpquota");
582 #endif
583 }
584
585 static char *data_mode_string(unsigned long mode)
586 {
587 switch (mode) {
588 case EXT3_MOUNT_JOURNAL_DATA:
589 return "journal";
590 case EXT3_MOUNT_ORDERED_DATA:
591 return "ordered";
592 case EXT3_MOUNT_WRITEBACK_DATA:
593 return "writeback";
594 }
595 return "unknown";
596 }
597
598 /*
599 * Show an option if
600 * - it's set to a non-default value OR
601 * - if the per-sb default is different from the global default
602 */
603 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
604 {
605 struct super_block *sb = vfs->mnt_sb;
606 struct ext3_sb_info *sbi = EXT3_SB(sb);
607 struct ext3_super_block *es = sbi->s_es;
608 unsigned long def_mount_opts;
609
610 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
611
612 if (sbi->s_sb_block != 1)
613 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
614 if (test_opt(sb, MINIX_DF))
615 seq_puts(seq, ",minixdf");
616 if (test_opt(sb, GRPID))
617 seq_puts(seq, ",grpid");
618 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
619 seq_puts(seq, ",nogrpid");
620 if (sbi->s_resuid != EXT3_DEF_RESUID ||
621 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
622 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
623 }
624 if (sbi->s_resgid != EXT3_DEF_RESGID ||
625 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
626 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
627 }
628 if (test_opt(sb, ERRORS_RO)) {
629 int def_errors = le16_to_cpu(es->s_errors);
630
631 if (def_errors == EXT3_ERRORS_PANIC ||
632 def_errors == EXT3_ERRORS_CONTINUE) {
633 seq_puts(seq, ",errors=remount-ro");
634 }
635 }
636 if (test_opt(sb, ERRORS_CONT))
637 seq_puts(seq, ",errors=continue");
638 if (test_opt(sb, ERRORS_PANIC))
639 seq_puts(seq, ",errors=panic");
640 if (test_opt(sb, NO_UID32))
641 seq_puts(seq, ",nouid32");
642 if (test_opt(sb, DEBUG))
643 seq_puts(seq, ",debug");
644 if (test_opt(sb, OLDALLOC))
645 seq_puts(seq, ",oldalloc");
646 #ifdef CONFIG_EXT3_FS_XATTR
647 if (test_opt(sb, XATTR_USER))
648 seq_puts(seq, ",user_xattr");
649 if (!test_opt(sb, XATTR_USER) &&
650 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
651 seq_puts(seq, ",nouser_xattr");
652 }
653 #endif
654 #ifdef CONFIG_EXT3_FS_POSIX_ACL
655 if (test_opt(sb, POSIX_ACL))
656 seq_puts(seq, ",acl");
657 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
658 seq_puts(seq, ",noacl");
659 #endif
660 if (!test_opt(sb, RESERVATION))
661 seq_puts(seq, ",noreservation");
662 if (sbi->s_commit_interval) {
663 seq_printf(seq, ",commit=%u",
664 (unsigned) (sbi->s_commit_interval / HZ));
665 }
666
667 /*
668 * Always display barrier state so it's clear what the status is.
669 */
670 seq_puts(seq, ",barrier=");
671 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
672 seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
673 if (test_opt(sb, DATA_ERR_ABORT))
674 seq_puts(seq, ",data_err=abort");
675
676 if (test_opt(sb, NOLOAD))
677 seq_puts(seq, ",norecovery");
678
679 ext3_show_quota_options(seq, sb);
680
681 return 0;
682 }
683
684
685 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
686 u64 ino, u32 generation)
687 {
688 struct inode *inode;
689
690 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
691 return ERR_PTR(-ESTALE);
692 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
693 return ERR_PTR(-ESTALE);
694
695 /* iget isn't really right if the inode is currently unallocated!!
696 *
697 * ext3_read_inode will return a bad_inode if the inode had been
698 * deleted, so we should be safe.
699 *
700 * Currently we don't know the generation for parent directory, so
701 * a generation of 0 means "accept any"
702 */
703 inode = ext3_iget(sb, ino);
704 if (IS_ERR(inode))
705 return ERR_CAST(inode);
706 if (generation && inode->i_generation != generation) {
707 iput(inode);
708 return ERR_PTR(-ESTALE);
709 }
710
711 return inode;
712 }
713
714 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
715 int fh_len, int fh_type)
716 {
717 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
718 ext3_nfs_get_inode);
719 }
720
721 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
722 int fh_len, int fh_type)
723 {
724 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
725 ext3_nfs_get_inode);
726 }
727
728 /*
729 * Try to release metadata pages (indirect blocks, directories) which are
730 * mapped via the block device. Since these pages could have journal heads
731 * which would prevent try_to_free_buffers() from freeing them, we must use
732 * jbd layer's try_to_free_buffers() function to release them.
733 */
734 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
735 gfp_t wait)
736 {
737 journal_t *journal = EXT3_SB(sb)->s_journal;
738
739 WARN_ON(PageChecked(page));
740 if (!page_has_buffers(page))
741 return 0;
742 if (journal)
743 return journal_try_to_free_buffers(journal, page,
744 wait & ~__GFP_WAIT);
745 return try_to_free_buffers(page);
746 }
747
748 #ifdef CONFIG_QUOTA
749 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
750 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
751
752 static int ext3_write_dquot(struct dquot *dquot);
753 static int ext3_acquire_dquot(struct dquot *dquot);
754 static int ext3_release_dquot(struct dquot *dquot);
755 static int ext3_mark_dquot_dirty(struct dquot *dquot);
756 static int ext3_write_info(struct super_block *sb, int type);
757 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
758 struct path *path);
759 static int ext3_quota_on_mount(struct super_block *sb, int type);
760 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
761 size_t len, loff_t off);
762 static ssize_t ext3_quota_write(struct super_block *sb, int type,
763 const char *data, size_t len, loff_t off);
764
765 static const struct dquot_operations ext3_quota_operations = {
766 .write_dquot = ext3_write_dquot,
767 .acquire_dquot = ext3_acquire_dquot,
768 .release_dquot = ext3_release_dquot,
769 .mark_dirty = ext3_mark_dquot_dirty,
770 .write_info = ext3_write_info,
771 .alloc_dquot = dquot_alloc,
772 .destroy_dquot = dquot_destroy,
773 };
774
775 static const struct quotactl_ops ext3_qctl_operations = {
776 .quota_on = ext3_quota_on,
777 .quota_off = dquot_quota_off,
778 .quota_sync = dquot_quota_sync,
779 .get_info = dquot_get_dqinfo,
780 .set_info = dquot_set_dqinfo,
781 .get_dqblk = dquot_get_dqblk,
782 .set_dqblk = dquot_set_dqblk
783 };
784 #endif
785
786 static const struct super_operations ext3_sops = {
787 .alloc_inode = ext3_alloc_inode,
788 .destroy_inode = ext3_destroy_inode,
789 .write_inode = ext3_write_inode,
790 .dirty_inode = ext3_dirty_inode,
791 .evict_inode = ext3_evict_inode,
792 .put_super = ext3_put_super,
793 .sync_fs = ext3_sync_fs,
794 .freeze_fs = ext3_freeze,
795 .unfreeze_fs = ext3_unfreeze,
796 .statfs = ext3_statfs,
797 .remount_fs = ext3_remount,
798 .show_options = ext3_show_options,
799 #ifdef CONFIG_QUOTA
800 .quota_read = ext3_quota_read,
801 .quota_write = ext3_quota_write,
802 #endif
803 .bdev_try_to_free_page = bdev_try_to_free_page,
804 };
805
806 static const struct export_operations ext3_export_ops = {
807 .fh_to_dentry = ext3_fh_to_dentry,
808 .fh_to_parent = ext3_fh_to_parent,
809 .get_parent = ext3_get_parent,
810 };
811
812 enum {
813 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
814 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
815 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
816 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
817 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
818 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
819 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
820 Opt_data_err_abort, Opt_data_err_ignore,
821 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
822 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
823 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
824 Opt_resize, Opt_usrquota, Opt_grpquota
825 };
826
827 static const match_table_t tokens = {
828 {Opt_bsd_df, "bsddf"},
829 {Opt_minix_df, "minixdf"},
830 {Opt_grpid, "grpid"},
831 {Opt_grpid, "bsdgroups"},
832 {Opt_nogrpid, "nogrpid"},
833 {Opt_nogrpid, "sysvgroups"},
834 {Opt_resgid, "resgid=%u"},
835 {Opt_resuid, "resuid=%u"},
836 {Opt_sb, "sb=%u"},
837 {Opt_err_cont, "errors=continue"},
838 {Opt_err_panic, "errors=panic"},
839 {Opt_err_ro, "errors=remount-ro"},
840 {Opt_nouid32, "nouid32"},
841 {Opt_nocheck, "nocheck"},
842 {Opt_nocheck, "check=none"},
843 {Opt_debug, "debug"},
844 {Opt_oldalloc, "oldalloc"},
845 {Opt_orlov, "orlov"},
846 {Opt_user_xattr, "user_xattr"},
847 {Opt_nouser_xattr, "nouser_xattr"},
848 {Opt_acl, "acl"},
849 {Opt_noacl, "noacl"},
850 {Opt_reservation, "reservation"},
851 {Opt_noreservation, "noreservation"},
852 {Opt_noload, "noload"},
853 {Opt_noload, "norecovery"},
854 {Opt_nobh, "nobh"},
855 {Opt_bh, "bh"},
856 {Opt_commit, "commit=%u"},
857 {Opt_journal_update, "journal=update"},
858 {Opt_journal_inum, "journal=%u"},
859 {Opt_journal_dev, "journal_dev=%u"},
860 {Opt_abort, "abort"},
861 {Opt_data_journal, "data=journal"},
862 {Opt_data_ordered, "data=ordered"},
863 {Opt_data_writeback, "data=writeback"},
864 {Opt_data_err_abort, "data_err=abort"},
865 {Opt_data_err_ignore, "data_err=ignore"},
866 {Opt_offusrjquota, "usrjquota="},
867 {Opt_usrjquota, "usrjquota=%s"},
868 {Opt_offgrpjquota, "grpjquota="},
869 {Opt_grpjquota, "grpjquota=%s"},
870 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
871 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
872 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
873 {Opt_grpquota, "grpquota"},
874 {Opt_noquota, "noquota"},
875 {Opt_quota, "quota"},
876 {Opt_usrquota, "usrquota"},
877 {Opt_barrier, "barrier=%u"},
878 {Opt_barrier, "barrier"},
879 {Opt_nobarrier, "nobarrier"},
880 {Opt_resize, "resize"},
881 {Opt_err, NULL},
882 };
883
884 static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
885 {
886 ext3_fsblk_t sb_block;
887 char *options = (char *) *data;
888
889 if (!options || strncmp(options, "sb=", 3) != 0)
890 return 1; /* Default location */
891 options += 3;
892 /*todo: use simple_strtoll with >32bit ext3 */
893 sb_block = simple_strtoul(options, &options, 0);
894 if (*options && *options != ',') {
895 ext3_msg(sb, "error: invalid sb specification: %s",
896 (char *) *data);
897 return 1;
898 }
899 if (*options == ',')
900 options++;
901 *data = (void *) options;
902 return sb_block;
903 }
904
905 #ifdef CONFIG_QUOTA
906 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
907 {
908 struct ext3_sb_info *sbi = EXT3_SB(sb);
909 char *qname;
910
911 if (sb_any_quota_loaded(sb) &&
912 !sbi->s_qf_names[qtype]) {
913 ext3_msg(sb, KERN_ERR,
914 "Cannot change journaled "
915 "quota options when quota turned on");
916 return 0;
917 }
918 qname = match_strdup(args);
919 if (!qname) {
920 ext3_msg(sb, KERN_ERR,
921 "Not enough memory for storing quotafile name");
922 return 0;
923 }
924 if (sbi->s_qf_names[qtype] &&
925 strcmp(sbi->s_qf_names[qtype], qname)) {
926 ext3_msg(sb, KERN_ERR,
927 "%s quota file already specified", QTYPE2NAME(qtype));
928 kfree(qname);
929 return 0;
930 }
931 sbi->s_qf_names[qtype] = qname;
932 if (strchr(sbi->s_qf_names[qtype], '/')) {
933 ext3_msg(sb, KERN_ERR,
934 "quotafile must be on filesystem root");
935 kfree(sbi->s_qf_names[qtype]);
936 sbi->s_qf_names[qtype] = NULL;
937 return 0;
938 }
939 set_opt(sbi->s_mount_opt, QUOTA);
940 return 1;
941 }
942
943 static int clear_qf_name(struct super_block *sb, int qtype) {
944
945 struct ext3_sb_info *sbi = EXT3_SB(sb);
946
947 if (sb_any_quota_loaded(sb) &&
948 sbi->s_qf_names[qtype]) {
949 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
950 " when quota turned on");
951 return 0;
952 }
953 /*
954 * The space will be released later when all options are confirmed
955 * to be correct
956 */
957 sbi->s_qf_names[qtype] = NULL;
958 return 1;
959 }
960 #endif
961
962 static int parse_options (char *options, struct super_block *sb,
963 unsigned int *inum, unsigned long *journal_devnum,
964 ext3_fsblk_t *n_blocks_count, int is_remount)
965 {
966 struct ext3_sb_info *sbi = EXT3_SB(sb);
967 char * p;
968 substring_t args[MAX_OPT_ARGS];
969 int data_opt = 0;
970 int option;
971 #ifdef CONFIG_QUOTA
972 int qfmt;
973 #endif
974
975 if (!options)
976 return 1;
977
978 while ((p = strsep (&options, ",")) != NULL) {
979 int token;
980 if (!*p)
981 continue;
982 /*
983 * Initialize args struct so we know whether arg was
984 * found; some options take optional arguments.
985 */
986 args[0].to = args[0].from = 0;
987 token = match_token(p, tokens, args);
988 switch (token) {
989 case Opt_bsd_df:
990 clear_opt (sbi->s_mount_opt, MINIX_DF);
991 break;
992 case Opt_minix_df:
993 set_opt (sbi->s_mount_opt, MINIX_DF);
994 break;
995 case Opt_grpid:
996 set_opt (sbi->s_mount_opt, GRPID);
997 break;
998 case Opt_nogrpid:
999 clear_opt (sbi->s_mount_opt, GRPID);
1000 break;
1001 case Opt_resuid:
1002 if (match_int(&args[0], &option))
1003 return 0;
1004 sbi->s_resuid = option;
1005 break;
1006 case Opt_resgid:
1007 if (match_int(&args[0], &option))
1008 return 0;
1009 sbi->s_resgid = option;
1010 break;
1011 case Opt_sb:
1012 /* handled by get_sb_block() instead of here */
1013 /* *sb_block = match_int(&args[0]); */
1014 break;
1015 case Opt_err_panic:
1016 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1017 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1018 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1019 break;
1020 case Opt_err_ro:
1021 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1022 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1023 set_opt (sbi->s_mount_opt, ERRORS_RO);
1024 break;
1025 case Opt_err_cont:
1026 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1027 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1028 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1029 break;
1030 case Opt_nouid32:
1031 set_opt (sbi->s_mount_opt, NO_UID32);
1032 break;
1033 case Opt_nocheck:
1034 clear_opt (sbi->s_mount_opt, CHECK);
1035 break;
1036 case Opt_debug:
1037 set_opt (sbi->s_mount_opt, DEBUG);
1038 break;
1039 case Opt_oldalloc:
1040 set_opt (sbi->s_mount_opt, OLDALLOC);
1041 break;
1042 case Opt_orlov:
1043 clear_opt (sbi->s_mount_opt, OLDALLOC);
1044 break;
1045 #ifdef CONFIG_EXT3_FS_XATTR
1046 case Opt_user_xattr:
1047 set_opt (sbi->s_mount_opt, XATTR_USER);
1048 break;
1049 case Opt_nouser_xattr:
1050 clear_opt (sbi->s_mount_opt, XATTR_USER);
1051 break;
1052 #else
1053 case Opt_user_xattr:
1054 case Opt_nouser_xattr:
1055 ext3_msg(sb, KERN_INFO,
1056 "(no)user_xattr options not supported");
1057 break;
1058 #endif
1059 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1060 case Opt_acl:
1061 set_opt(sbi->s_mount_opt, POSIX_ACL);
1062 break;
1063 case Opt_noacl:
1064 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1065 break;
1066 #else
1067 case Opt_acl:
1068 case Opt_noacl:
1069 ext3_msg(sb, KERN_INFO,
1070 "(no)acl options not supported");
1071 break;
1072 #endif
1073 case Opt_reservation:
1074 set_opt(sbi->s_mount_opt, RESERVATION);
1075 break;
1076 case Opt_noreservation:
1077 clear_opt(sbi->s_mount_opt, RESERVATION);
1078 break;
1079 case Opt_journal_update:
1080 /* @@@ FIXME */
1081 /* Eventually we will want to be able to create
1082 a journal file here. For now, only allow the
1083 user to specify an existing inode to be the
1084 journal file. */
1085 if (is_remount) {
1086 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1087 "journal on remount");
1088 return 0;
1089 }
1090 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1091 break;
1092 case Opt_journal_inum:
1093 if (is_remount) {
1094 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1095 "journal on remount");
1096 return 0;
1097 }
1098 if (match_int(&args[0], &option))
1099 return 0;
1100 *inum = option;
1101 break;
1102 case Opt_journal_dev:
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 *journal_devnum = option;
1111 break;
1112 case Opt_noload:
1113 set_opt (sbi->s_mount_opt, NOLOAD);
1114 break;
1115 case Opt_commit:
1116 if (match_int(&args[0], &option))
1117 return 0;
1118 if (option < 0)
1119 return 0;
1120 if (option == 0)
1121 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1122 sbi->s_commit_interval = HZ * option;
1123 break;
1124 case Opt_data_journal:
1125 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1126 goto datacheck;
1127 case Opt_data_ordered:
1128 data_opt = EXT3_MOUNT_ORDERED_DATA;
1129 goto datacheck;
1130 case Opt_data_writeback:
1131 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1132 datacheck:
1133 if (is_remount) {
1134 if (test_opt(sb, DATA_FLAGS) == data_opt)
1135 break;
1136 ext3_msg(sb, KERN_ERR,
1137 "error: cannot change "
1138 "data mode on remount. The filesystem "
1139 "is mounted in data=%s mode and you "
1140 "try to remount it in data=%s mode.",
1141 data_mode_string(test_opt(sb,
1142 DATA_FLAGS)),
1143 data_mode_string(data_opt));
1144 return 0;
1145 } else {
1146 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1147 sbi->s_mount_opt |= data_opt;
1148 }
1149 break;
1150 case Opt_data_err_abort:
1151 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1152 break;
1153 case Opt_data_err_ignore:
1154 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1155 break;
1156 #ifdef CONFIG_QUOTA
1157 case Opt_usrjquota:
1158 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1159 return 0;
1160 break;
1161 case Opt_grpjquota:
1162 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1163 return 0;
1164 break;
1165 case Opt_offusrjquota:
1166 if (!clear_qf_name(sb, USRQUOTA))
1167 return 0;
1168 break;
1169 case Opt_offgrpjquota:
1170 if (!clear_qf_name(sb, GRPQUOTA))
1171 return 0;
1172 break;
1173 case Opt_jqfmt_vfsold:
1174 qfmt = QFMT_VFS_OLD;
1175 goto set_qf_format;
1176 case Opt_jqfmt_vfsv0:
1177 qfmt = QFMT_VFS_V0;
1178 goto set_qf_format;
1179 case Opt_jqfmt_vfsv1:
1180 qfmt = QFMT_VFS_V1;
1181 set_qf_format:
1182 if (sb_any_quota_loaded(sb) &&
1183 sbi->s_jquota_fmt != qfmt) {
1184 ext3_msg(sb, KERN_ERR, "error: cannot change "
1185 "journaled quota options when "
1186 "quota turned on.");
1187 return 0;
1188 }
1189 sbi->s_jquota_fmt = qfmt;
1190 break;
1191 case Opt_quota:
1192 case Opt_usrquota:
1193 set_opt(sbi->s_mount_opt, QUOTA);
1194 set_opt(sbi->s_mount_opt, USRQUOTA);
1195 break;
1196 case Opt_grpquota:
1197 set_opt(sbi->s_mount_opt, QUOTA);
1198 set_opt(sbi->s_mount_opt, GRPQUOTA);
1199 break;
1200 case Opt_noquota:
1201 if (sb_any_quota_loaded(sb)) {
1202 ext3_msg(sb, KERN_ERR, "error: cannot change "
1203 "quota options when quota turned on.");
1204 return 0;
1205 }
1206 clear_opt(sbi->s_mount_opt, QUOTA);
1207 clear_opt(sbi->s_mount_opt, USRQUOTA);
1208 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1209 break;
1210 #else
1211 case Opt_quota:
1212 case Opt_usrquota:
1213 case Opt_grpquota:
1214 ext3_msg(sb, KERN_ERR,
1215 "error: quota options not supported.");
1216 break;
1217 case Opt_usrjquota:
1218 case Opt_grpjquota:
1219 case Opt_offusrjquota:
1220 case Opt_offgrpjquota:
1221 case Opt_jqfmt_vfsold:
1222 case Opt_jqfmt_vfsv0:
1223 case Opt_jqfmt_vfsv1:
1224 ext3_msg(sb, KERN_ERR,
1225 "error: journaled quota options not "
1226 "supported.");
1227 break;
1228 case Opt_noquota:
1229 break;
1230 #endif
1231 case Opt_abort:
1232 set_opt(sbi->s_mount_opt, ABORT);
1233 break;
1234 case Opt_nobarrier:
1235 clear_opt(sbi->s_mount_opt, BARRIER);
1236 break;
1237 case Opt_barrier:
1238 if (args[0].from) {
1239 if (match_int(&args[0], &option))
1240 return 0;
1241 } else
1242 option = 1; /* No argument, default to 1 */
1243 if (option)
1244 set_opt(sbi->s_mount_opt, BARRIER);
1245 else
1246 clear_opt(sbi->s_mount_opt, BARRIER);
1247 break;
1248 case Opt_ignore:
1249 break;
1250 case Opt_resize:
1251 if (!is_remount) {
1252 ext3_msg(sb, KERN_ERR,
1253 "error: resize option only available "
1254 "for remount");
1255 return 0;
1256 }
1257 if (match_int(&args[0], &option) != 0)
1258 return 0;
1259 *n_blocks_count = option;
1260 break;
1261 case Opt_nobh:
1262 ext3_msg(sb, KERN_WARNING,
1263 "warning: ignoring deprecated nobh option");
1264 break;
1265 case Opt_bh:
1266 ext3_msg(sb, KERN_WARNING,
1267 "warning: ignoring deprecated bh option");
1268 break;
1269 default:
1270 ext3_msg(sb, KERN_ERR,
1271 "error: unrecognized mount option \"%s\" "
1272 "or missing value", p);
1273 return 0;
1274 }
1275 }
1276 #ifdef CONFIG_QUOTA
1277 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1278 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1279 clear_opt(sbi->s_mount_opt, USRQUOTA);
1280 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1281 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1282
1283 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1284 ext3_msg(sb, KERN_ERR, "error: old and new quota "
1285 "format mixing.");
1286 return 0;
1287 }
1288
1289 if (!sbi->s_jquota_fmt) {
1290 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1291 "not specified.");
1292 return 0;
1293 }
1294 } else {
1295 if (sbi->s_jquota_fmt) {
1296 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1297 "specified with no journaling "
1298 "enabled.");
1299 return 0;
1300 }
1301 }
1302 #endif
1303 return 1;
1304 }
1305
1306 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1307 int read_only)
1308 {
1309 struct ext3_sb_info *sbi = EXT3_SB(sb);
1310 int res = 0;
1311
1312 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1313 ext3_msg(sb, KERN_ERR,
1314 "error: revision level too high, "
1315 "forcing read-only mode");
1316 res = MS_RDONLY;
1317 }
1318 if (read_only)
1319 return res;
1320 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1321 ext3_msg(sb, KERN_WARNING,
1322 "warning: mounting unchecked fs, "
1323 "running e2fsck is recommended");
1324 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1325 ext3_msg(sb, KERN_WARNING,
1326 "warning: mounting fs with errors, "
1327 "running e2fsck is recommended");
1328 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1329 le16_to_cpu(es->s_mnt_count) >=
1330 le16_to_cpu(es->s_max_mnt_count))
1331 ext3_msg(sb, KERN_WARNING,
1332 "warning: maximal mount count reached, "
1333 "running e2fsck is recommended");
1334 else if (le32_to_cpu(es->s_checkinterval) &&
1335 (le32_to_cpu(es->s_lastcheck) +
1336 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1337 ext3_msg(sb, KERN_WARNING,
1338 "warning: checktime reached, "
1339 "running e2fsck is recommended");
1340 #if 0
1341 /* @@@ We _will_ want to clear the valid bit if we find
1342 inconsistencies, to force a fsck at reboot. But for
1343 a plain journaled filesystem we can keep it set as
1344 valid forever! :) */
1345 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1346 #endif
1347 if (!le16_to_cpu(es->s_max_mnt_count))
1348 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1349 le16_add_cpu(&es->s_mnt_count, 1);
1350 es->s_mtime = cpu_to_le32(get_seconds());
1351 ext3_update_dynamic_rev(sb);
1352 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1353
1354 ext3_commit_super(sb, es, 1);
1355 if (test_opt(sb, DEBUG))
1356 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1357 "bpg=%lu, ipg=%lu, mo=%04lx]",
1358 sb->s_blocksize,
1359 sbi->s_groups_count,
1360 EXT3_BLOCKS_PER_GROUP(sb),
1361 EXT3_INODES_PER_GROUP(sb),
1362 sbi->s_mount_opt);
1363
1364 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1365 char b[BDEVNAME_SIZE];
1366 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1367 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1368 } else {
1369 ext3_msg(sb, KERN_INFO, "using internal journal");
1370 }
1371 cleancache_init_fs(sb);
1372 return res;
1373 }
1374
1375 /* Called at mount-time, super-block is locked */
1376 static int ext3_check_descriptors(struct super_block *sb)
1377 {
1378 struct ext3_sb_info *sbi = EXT3_SB(sb);
1379 int i;
1380
1381 ext3_debug ("Checking group descriptors");
1382
1383 for (i = 0; i < sbi->s_groups_count; i++) {
1384 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1385 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1386 ext3_fsblk_t last_block;
1387
1388 if (i == sbi->s_groups_count - 1)
1389 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1390 else
1391 last_block = first_block +
1392 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1393
1394 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1395 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1396 {
1397 ext3_error (sb, "ext3_check_descriptors",
1398 "Block bitmap for group %d"
1399 " not in group (block %lu)!",
1400 i, (unsigned long)
1401 le32_to_cpu(gdp->bg_block_bitmap));
1402 return 0;
1403 }
1404 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1405 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1406 {
1407 ext3_error (sb, "ext3_check_descriptors",
1408 "Inode bitmap for group %d"
1409 " not in group (block %lu)!",
1410 i, (unsigned long)
1411 le32_to_cpu(gdp->bg_inode_bitmap));
1412 return 0;
1413 }
1414 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1415 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1416 last_block)
1417 {
1418 ext3_error (sb, "ext3_check_descriptors",
1419 "Inode table for group %d"
1420 " not in group (block %lu)!",
1421 i, (unsigned long)
1422 le32_to_cpu(gdp->bg_inode_table));
1423 return 0;
1424 }
1425 }
1426
1427 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1428 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1429 return 1;
1430 }
1431
1432
1433 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1434 * the superblock) which were deleted from all directories, but held open by
1435 * a process at the time of a crash. We walk the list and try to delete these
1436 * inodes at recovery time (only with a read-write filesystem).
1437 *
1438 * In order to keep the orphan inode chain consistent during traversal (in
1439 * case of crash during recovery), we link each inode into the superblock
1440 * orphan list_head and handle it the same way as an inode deletion during
1441 * normal operation (which journals the operations for us).
1442 *
1443 * We only do an iget() and an iput() on each inode, which is very safe if we
1444 * accidentally point at an in-use or already deleted inode. The worst that
1445 * can happen in this case is that we get a "bit already cleared" message from
1446 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1447 * e2fsck was run on this filesystem, and it must have already done the orphan
1448 * inode cleanup for us, so we can safely abort without any further action.
1449 */
1450 static void ext3_orphan_cleanup (struct super_block * sb,
1451 struct ext3_super_block * es)
1452 {
1453 unsigned int s_flags = sb->s_flags;
1454 int nr_orphans = 0, nr_truncates = 0;
1455 #ifdef CONFIG_QUOTA
1456 int i;
1457 #endif
1458 if (!es->s_last_orphan) {
1459 jbd_debug(4, "no orphan inodes to clean up\n");
1460 return;
1461 }
1462
1463 if (bdev_read_only(sb->s_bdev)) {
1464 ext3_msg(sb, KERN_ERR, "error: write access "
1465 "unavailable, skipping orphan cleanup.");
1466 return;
1467 }
1468
1469 /* Check if feature set allows readwrite operations */
1470 if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) {
1471 ext3_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
1472 "unknown ROCOMPAT features");
1473 return;
1474 }
1475
1476 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1477 if (es->s_last_orphan)
1478 jbd_debug(1, "Errors on filesystem, "
1479 "clearing orphan list.\n");
1480 es->s_last_orphan = 0;
1481 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1482 return;
1483 }
1484
1485 if (s_flags & MS_RDONLY) {
1486 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1487 sb->s_flags &= ~MS_RDONLY;
1488 }
1489 #ifdef CONFIG_QUOTA
1490 /* Needed for iput() to work correctly and not trash data */
1491 sb->s_flags |= MS_ACTIVE;
1492 /* Turn on quotas so that they are updated correctly */
1493 for (i = 0; i < MAXQUOTAS; i++) {
1494 if (EXT3_SB(sb)->s_qf_names[i]) {
1495 int ret = ext3_quota_on_mount(sb, i);
1496 if (ret < 0)
1497 ext3_msg(sb, KERN_ERR,
1498 "error: cannot turn on journaled "
1499 "quota: %d", ret);
1500 }
1501 }
1502 #endif
1503
1504 while (es->s_last_orphan) {
1505 struct inode *inode;
1506
1507 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1508 if (IS_ERR(inode)) {
1509 es->s_last_orphan = 0;
1510 break;
1511 }
1512
1513 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1514 dquot_initialize(inode);
1515 if (inode->i_nlink) {
1516 printk(KERN_DEBUG
1517 "%s: truncating inode %lu to %Ld bytes\n",
1518 __func__, inode->i_ino, inode->i_size);
1519 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1520 inode->i_ino, inode->i_size);
1521 ext3_truncate(inode);
1522 nr_truncates++;
1523 } else {
1524 printk(KERN_DEBUG
1525 "%s: deleting unreferenced inode %lu\n",
1526 __func__, inode->i_ino);
1527 jbd_debug(2, "deleting unreferenced inode %lu\n",
1528 inode->i_ino);
1529 nr_orphans++;
1530 }
1531 iput(inode); /* The delete magic happens here! */
1532 }
1533
1534 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1535
1536 if (nr_orphans)
1537 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1538 PLURAL(nr_orphans));
1539 if (nr_truncates)
1540 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1541 PLURAL(nr_truncates));
1542 #ifdef CONFIG_QUOTA
1543 /* Turn quotas off */
1544 for (i = 0; i < MAXQUOTAS; i++) {
1545 if (sb_dqopt(sb)->files[i])
1546 dquot_quota_off(sb, i);
1547 }
1548 #endif
1549 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1550 }
1551
1552 /*
1553 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1554 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1555 * We need to be 1 filesystem block less than the 2^32 sector limit.
1556 */
1557 static loff_t ext3_max_size(int bits)
1558 {
1559 loff_t res = EXT3_NDIR_BLOCKS;
1560 int meta_blocks;
1561 loff_t upper_limit;
1562
1563 /* This is calculated to be the largest file size for a
1564 * dense, file such that the total number of
1565 * sectors in the file, including data and all indirect blocks,
1566 * does not exceed 2^32 -1
1567 * __u32 i_blocks representing the total number of
1568 * 512 bytes blocks of the file
1569 */
1570 upper_limit = (1LL << 32) - 1;
1571
1572 /* total blocks in file system block size */
1573 upper_limit >>= (bits - 9);
1574
1575
1576 /* indirect blocks */
1577 meta_blocks = 1;
1578 /* double indirect blocks */
1579 meta_blocks += 1 + (1LL << (bits-2));
1580 /* tripple indirect blocks */
1581 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1582
1583 upper_limit -= meta_blocks;
1584 upper_limit <<= bits;
1585
1586 res += 1LL << (bits-2);
1587 res += 1LL << (2*(bits-2));
1588 res += 1LL << (3*(bits-2));
1589 res <<= bits;
1590 if (res > upper_limit)
1591 res = upper_limit;
1592
1593 if (res > MAX_LFS_FILESIZE)
1594 res = MAX_LFS_FILESIZE;
1595
1596 return res;
1597 }
1598
1599 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1600 ext3_fsblk_t logic_sb_block,
1601 int nr)
1602 {
1603 struct ext3_sb_info *sbi = EXT3_SB(sb);
1604 unsigned long bg, first_meta_bg;
1605 int has_super = 0;
1606
1607 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1608
1609 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1610 nr < first_meta_bg)
1611 return (logic_sb_block + nr + 1);
1612 bg = sbi->s_desc_per_block * nr;
1613 if (ext3_bg_has_super(sb, bg))
1614 has_super = 1;
1615 return (has_super + ext3_group_first_block_no(sb, bg));
1616 }
1617
1618
1619 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1620 {
1621 struct buffer_head * bh;
1622 struct ext3_super_block *es = NULL;
1623 struct ext3_sb_info *sbi;
1624 ext3_fsblk_t block;
1625 ext3_fsblk_t sb_block = get_sb_block(&data, sb);
1626 ext3_fsblk_t logic_sb_block;
1627 unsigned long offset = 0;
1628 unsigned int journal_inum = 0;
1629 unsigned long journal_devnum = 0;
1630 unsigned long def_mount_opts;
1631 struct inode *root;
1632 int blocksize;
1633 int hblock;
1634 int db_count;
1635 int i;
1636 int needs_recovery;
1637 int ret = -EINVAL;
1638 __le32 features;
1639 int err;
1640
1641 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1642 if (!sbi)
1643 return -ENOMEM;
1644
1645 sbi->s_blockgroup_lock =
1646 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1647 if (!sbi->s_blockgroup_lock) {
1648 kfree(sbi);
1649 return -ENOMEM;
1650 }
1651 sb->s_fs_info = sbi;
1652 sbi->s_mount_opt = 0;
1653 sbi->s_resuid = EXT3_DEF_RESUID;
1654 sbi->s_resgid = EXT3_DEF_RESGID;
1655 sbi->s_sb_block = sb_block;
1656
1657 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1658 if (!blocksize) {
1659 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1660 goto out_fail;
1661 }
1662
1663 /*
1664 * The ext3 superblock will not be buffer aligned for other than 1kB
1665 * block sizes. We need to calculate the offset from buffer start.
1666 */
1667 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1668 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1669 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1670 } else {
1671 logic_sb_block = sb_block;
1672 }
1673
1674 if (!(bh = sb_bread(sb, logic_sb_block))) {
1675 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1676 goto out_fail;
1677 }
1678 /*
1679 * Note: s_es must be initialized as soon as possible because
1680 * some ext3 macro-instructions depend on its value
1681 */
1682 es = (struct ext3_super_block *) (bh->b_data + offset);
1683 sbi->s_es = es;
1684 sb->s_magic = le16_to_cpu(es->s_magic);
1685 if (sb->s_magic != EXT3_SUPER_MAGIC)
1686 goto cantfind_ext3;
1687
1688 /* Set defaults before we parse the mount options */
1689 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1690 if (def_mount_opts & EXT3_DEFM_DEBUG)
1691 set_opt(sbi->s_mount_opt, DEBUG);
1692 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1693 set_opt(sbi->s_mount_opt, GRPID);
1694 if (def_mount_opts & EXT3_DEFM_UID16)
1695 set_opt(sbi->s_mount_opt, NO_UID32);
1696 #ifdef CONFIG_EXT3_FS_XATTR
1697 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1698 set_opt(sbi->s_mount_opt, XATTR_USER);
1699 #endif
1700 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1701 if (def_mount_opts & EXT3_DEFM_ACL)
1702 set_opt(sbi->s_mount_opt, POSIX_ACL);
1703 #endif
1704 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1705 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1706 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1707 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1708 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1709 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1710
1711 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1712 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1713 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1714 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1715 else
1716 set_opt(sbi->s_mount_opt, ERRORS_RO);
1717
1718 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1719 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1720
1721 set_opt(sbi->s_mount_opt, RESERVATION);
1722
1723 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1724 NULL, 0))
1725 goto failed_mount;
1726
1727 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1728 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1729
1730 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1731 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1732 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1733 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1734 ext3_msg(sb, KERN_WARNING,
1735 "warning: feature flags set on rev 0 fs, "
1736 "running e2fsck is recommended");
1737 /*
1738 * Check feature flags regardless of the revision level, since we
1739 * previously didn't change the revision level when setting the flags,
1740 * so there is a chance incompat flags are set on a rev 0 filesystem.
1741 */
1742 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1743 if (features) {
1744 ext3_msg(sb, KERN_ERR,
1745 "error: couldn't mount because of unsupported "
1746 "optional features (%x)", le32_to_cpu(features));
1747 goto failed_mount;
1748 }
1749 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1750 if (!(sb->s_flags & MS_RDONLY) && features) {
1751 ext3_msg(sb, KERN_ERR,
1752 "error: couldn't mount RDWR because of unsupported "
1753 "optional features (%x)", le32_to_cpu(features));
1754 goto failed_mount;
1755 }
1756 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1757
1758 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1759 blocksize > EXT3_MAX_BLOCK_SIZE) {
1760 ext3_msg(sb, KERN_ERR,
1761 "error: couldn't mount because of unsupported "
1762 "filesystem blocksize %d", blocksize);
1763 goto failed_mount;
1764 }
1765
1766 hblock = bdev_logical_block_size(sb->s_bdev);
1767 if (sb->s_blocksize != blocksize) {
1768 /*
1769 * Make sure the blocksize for the filesystem is larger
1770 * than the hardware sectorsize for the machine.
1771 */
1772 if (blocksize < hblock) {
1773 ext3_msg(sb, KERN_ERR,
1774 "error: fsblocksize %d too small for "
1775 "hardware sectorsize %d", blocksize, hblock);
1776 goto failed_mount;
1777 }
1778
1779 brelse (bh);
1780 if (!sb_set_blocksize(sb, blocksize)) {
1781 ext3_msg(sb, KERN_ERR,
1782 "error: bad blocksize %d", blocksize);
1783 goto out_fail;
1784 }
1785 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1786 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1787 bh = sb_bread(sb, logic_sb_block);
1788 if (!bh) {
1789 ext3_msg(sb, KERN_ERR,
1790 "error: can't read superblock on 2nd try");
1791 goto failed_mount;
1792 }
1793 es = (struct ext3_super_block *)(bh->b_data + offset);
1794 sbi->s_es = es;
1795 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1796 ext3_msg(sb, KERN_ERR,
1797 "error: magic mismatch");
1798 goto failed_mount;
1799 }
1800 }
1801
1802 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1803
1804 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1805 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1806 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1807 } else {
1808 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1809 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1810 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1811 (!is_power_of_2(sbi->s_inode_size)) ||
1812 (sbi->s_inode_size > blocksize)) {
1813 ext3_msg(sb, KERN_ERR,
1814 "error: unsupported inode size: %d",
1815 sbi->s_inode_size);
1816 goto failed_mount;
1817 }
1818 }
1819 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1820 le32_to_cpu(es->s_log_frag_size);
1821 if (blocksize != sbi->s_frag_size) {
1822 ext3_msg(sb, KERN_ERR,
1823 "error: fragsize %lu != blocksize %u (unsupported)",
1824 sbi->s_frag_size, blocksize);
1825 goto failed_mount;
1826 }
1827 sbi->s_frags_per_block = 1;
1828 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1829 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1830 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1831 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1832 goto cantfind_ext3;
1833 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1834 if (sbi->s_inodes_per_block == 0)
1835 goto cantfind_ext3;
1836 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1837 sbi->s_inodes_per_block;
1838 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1839 sbi->s_sbh = bh;
1840 sbi->s_mount_state = le16_to_cpu(es->s_state);
1841 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1842 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1843 for (i=0; i < 4; i++)
1844 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1845 sbi->s_def_hash_version = es->s_def_hash_version;
1846 i = le32_to_cpu(es->s_flags);
1847 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1848 sbi->s_hash_unsigned = 3;
1849 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1850 #ifdef __CHAR_UNSIGNED__
1851 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1852 sbi->s_hash_unsigned = 3;
1853 #else
1854 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1855 #endif
1856 }
1857
1858 if (sbi->s_blocks_per_group > blocksize * 8) {
1859 ext3_msg(sb, KERN_ERR,
1860 "#blocks per group too big: %lu",
1861 sbi->s_blocks_per_group);
1862 goto failed_mount;
1863 }
1864 if (sbi->s_frags_per_group > blocksize * 8) {
1865 ext3_msg(sb, KERN_ERR,
1866 "error: #fragments per group too big: %lu",
1867 sbi->s_frags_per_group);
1868 goto failed_mount;
1869 }
1870 if (sbi->s_inodes_per_group > blocksize * 8) {
1871 ext3_msg(sb, KERN_ERR,
1872 "error: #inodes per group too big: %lu",
1873 sbi->s_inodes_per_group);
1874 goto failed_mount;
1875 }
1876
1877 err = generic_check_addressable(sb->s_blocksize_bits,
1878 le32_to_cpu(es->s_blocks_count));
1879 if (err) {
1880 ext3_msg(sb, KERN_ERR,
1881 "error: filesystem is too large to mount safely");
1882 if (sizeof(sector_t) < 8)
1883 ext3_msg(sb, KERN_ERR,
1884 "error: CONFIG_LBDAF not enabled");
1885 ret = err;
1886 goto failed_mount;
1887 }
1888
1889 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1890 goto cantfind_ext3;
1891 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1892 le32_to_cpu(es->s_first_data_block) - 1)
1893 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1894 db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
1895 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1896 GFP_KERNEL);
1897 if (sbi->s_group_desc == NULL) {
1898 ext3_msg(sb, KERN_ERR,
1899 "error: not enough memory");
1900 ret = -ENOMEM;
1901 goto failed_mount;
1902 }
1903
1904 bgl_lock_init(sbi->s_blockgroup_lock);
1905
1906 for (i = 0; i < db_count; i++) {
1907 block = descriptor_loc(sb, logic_sb_block, i);
1908 sbi->s_group_desc[i] = sb_bread(sb, block);
1909 if (!sbi->s_group_desc[i]) {
1910 ext3_msg(sb, KERN_ERR,
1911 "error: can't read group descriptor %d", i);
1912 db_count = i;
1913 goto failed_mount2;
1914 }
1915 }
1916 if (!ext3_check_descriptors (sb)) {
1917 ext3_msg(sb, KERN_ERR,
1918 "error: group descriptors corrupted");
1919 goto failed_mount2;
1920 }
1921 sbi->s_gdb_count = db_count;
1922 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1923 spin_lock_init(&sbi->s_next_gen_lock);
1924
1925 /* per fileystem reservation list head & lock */
1926 spin_lock_init(&sbi->s_rsv_window_lock);
1927 sbi->s_rsv_window_root = RB_ROOT;
1928 /* Add a single, static dummy reservation to the start of the
1929 * reservation window list --- it gives us a placeholder for
1930 * append-at-start-of-list which makes the allocation logic
1931 * _much_ simpler. */
1932 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1933 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1934 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1935 sbi->s_rsv_window_head.rsv_goal_size = 0;
1936 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1937
1938 /*
1939 * set up enough so that it can read an inode
1940 */
1941 sb->s_op = &ext3_sops;
1942 sb->s_export_op = &ext3_export_ops;
1943 sb->s_xattr = ext3_xattr_handlers;
1944 #ifdef CONFIG_QUOTA
1945 sb->s_qcop = &ext3_qctl_operations;
1946 sb->dq_op = &ext3_quota_operations;
1947 #endif
1948 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
1949 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1950 mutex_init(&sbi->s_orphan_lock);
1951 mutex_init(&sbi->s_resize_lock);
1952
1953 sb->s_root = NULL;
1954
1955 needs_recovery = (es->s_last_orphan != 0 ||
1956 EXT3_HAS_INCOMPAT_FEATURE(sb,
1957 EXT3_FEATURE_INCOMPAT_RECOVER));
1958
1959 /*
1960 * The first inode we look at is the journal inode. Don't try
1961 * root first: it may be modified in the journal!
1962 */
1963 if (!test_opt(sb, NOLOAD) &&
1964 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1965 if (ext3_load_journal(sb, es, journal_devnum))
1966 goto failed_mount2;
1967 } else if (journal_inum) {
1968 if (ext3_create_journal(sb, es, journal_inum))
1969 goto failed_mount2;
1970 } else {
1971 if (!silent)
1972 ext3_msg(sb, KERN_ERR,
1973 "error: no journal found. "
1974 "mounting ext3 over ext2?");
1975 goto failed_mount2;
1976 }
1977 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1978 ext3_count_free_blocks(sb));
1979 if (!err) {
1980 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1981 ext3_count_free_inodes(sb));
1982 }
1983 if (!err) {
1984 err = percpu_counter_init(&sbi->s_dirs_counter,
1985 ext3_count_dirs(sb));
1986 }
1987 if (err) {
1988 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
1989 ret = err;
1990 goto failed_mount3;
1991 }
1992
1993 /* We have now updated the journal if required, so we can
1994 * validate the data journaling mode. */
1995 switch (test_opt(sb, DATA_FLAGS)) {
1996 case 0:
1997 /* No mode set, assume a default based on the journal
1998 capabilities: ORDERED_DATA if the journal can
1999 cope, else JOURNAL_DATA */
2000 if (journal_check_available_features
2001 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
2002 set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
2003 else
2004 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2005 break;
2006
2007 case EXT3_MOUNT_ORDERED_DATA:
2008 case EXT3_MOUNT_WRITEBACK_DATA:
2009 if (!journal_check_available_features
2010 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
2011 ext3_msg(sb, KERN_ERR,
2012 "error: journal does not support "
2013 "requested data journaling mode");
2014 goto failed_mount3;
2015 }
2016 default:
2017 break;
2018 }
2019
2020 /*
2021 * The journal_load will have done any necessary log recovery,
2022 * so we can safely mount the rest of the filesystem now.
2023 */
2024
2025 root = ext3_iget(sb, EXT3_ROOT_INO);
2026 if (IS_ERR(root)) {
2027 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
2028 ret = PTR_ERR(root);
2029 goto failed_mount3;
2030 }
2031 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2032 iput(root);
2033 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
2034 goto failed_mount3;
2035 }
2036 sb->s_root = d_alloc_root(root);
2037 if (!sb->s_root) {
2038 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
2039 iput(root);
2040 ret = -ENOMEM;
2041 goto failed_mount3;
2042 }
2043
2044 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
2045
2046 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2047 ext3_orphan_cleanup(sb, es);
2048 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2049 if (needs_recovery)
2050 ext3_msg(sb, KERN_INFO, "recovery complete");
2051 ext3_mark_recovery_complete(sb, es);
2052 ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
2053 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2054 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2055 "writeback");
2056
2057 return 0;
2058
2059 cantfind_ext3:
2060 if (!silent)
2061 ext3_msg(sb, KERN_INFO,
2062 "error: can't find ext3 filesystem on dev %s.",
2063 sb->s_id);
2064 goto failed_mount;
2065
2066 failed_mount3:
2067 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2068 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2069 percpu_counter_destroy(&sbi->s_dirs_counter);
2070 journal_destroy(sbi->s_journal);
2071 failed_mount2:
2072 for (i = 0; i < db_count; i++)
2073 brelse(sbi->s_group_desc[i]);
2074 kfree(sbi->s_group_desc);
2075 failed_mount:
2076 #ifdef CONFIG_QUOTA
2077 for (i = 0; i < MAXQUOTAS; i++)
2078 kfree(sbi->s_qf_names[i]);
2079 #endif
2080 ext3_blkdev_remove(sbi);
2081 brelse(bh);
2082 out_fail:
2083 sb->s_fs_info = NULL;
2084 kfree(sbi->s_blockgroup_lock);
2085 kfree(sbi);
2086 return ret;
2087 }
2088
2089 /*
2090 * Setup any per-fs journal parameters now. We'll do this both on
2091 * initial mount, once the journal has been initialised but before we've
2092 * done any recovery; and again on any subsequent remount.
2093 */
2094 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2095 {
2096 struct ext3_sb_info *sbi = EXT3_SB(sb);
2097
2098 if (sbi->s_commit_interval)
2099 journal->j_commit_interval = sbi->s_commit_interval;
2100 /* We could also set up an ext3-specific default for the commit
2101 * interval here, but for now we'll just fall back to the jbd
2102 * default. */
2103
2104 spin_lock(&journal->j_state_lock);
2105 if (test_opt(sb, BARRIER))
2106 journal->j_flags |= JFS_BARRIER;
2107 else
2108 journal->j_flags &= ~JFS_BARRIER;
2109 if (test_opt(sb, DATA_ERR_ABORT))
2110 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2111 else
2112 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2113 spin_unlock(&journal->j_state_lock);
2114 }
2115
2116 static journal_t *ext3_get_journal(struct super_block *sb,
2117 unsigned int journal_inum)
2118 {
2119 struct inode *journal_inode;
2120 journal_t *journal;
2121
2122 /* First, test for the existence of a valid inode on disk. Bad
2123 * things happen if we iget() an unused inode, as the subsequent
2124 * iput() will try to delete it. */
2125
2126 journal_inode = ext3_iget(sb, journal_inum);
2127 if (IS_ERR(journal_inode)) {
2128 ext3_msg(sb, KERN_ERR, "error: no journal found");
2129 return NULL;
2130 }
2131 if (!journal_inode->i_nlink) {
2132 make_bad_inode(journal_inode);
2133 iput(journal_inode);
2134 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
2135 return NULL;
2136 }
2137
2138 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2139 journal_inode, journal_inode->i_size);
2140 if (!S_ISREG(journal_inode->i_mode)) {
2141 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
2142 iput(journal_inode);
2143 return NULL;
2144 }
2145
2146 journal = journal_init_inode(journal_inode);
2147 if (!journal) {
2148 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
2149 iput(journal_inode);
2150 return NULL;
2151 }
2152 journal->j_private = sb;
2153 ext3_init_journal_params(sb, journal);
2154 return journal;
2155 }
2156
2157 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2158 dev_t j_dev)
2159 {
2160 struct buffer_head * bh;
2161 journal_t *journal;
2162 ext3_fsblk_t start;
2163 ext3_fsblk_t len;
2164 int hblock, blocksize;
2165 ext3_fsblk_t sb_block;
2166 unsigned long offset;
2167 struct ext3_super_block * es;
2168 struct block_device *bdev;
2169
2170 bdev = ext3_blkdev_get(j_dev, sb);
2171 if (bdev == NULL)
2172 return NULL;
2173
2174 blocksize = sb->s_blocksize;
2175 hblock = bdev_logical_block_size(bdev);
2176 if (blocksize < hblock) {
2177 ext3_msg(sb, KERN_ERR,
2178 "error: blocksize too small for journal device");
2179 goto out_bdev;
2180 }
2181
2182 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2183 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2184 set_blocksize(bdev, blocksize);
2185 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2186 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2187 "external journal");
2188 goto out_bdev;
2189 }
2190
2191 es = (struct ext3_super_block *) (bh->b_data + offset);
2192 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2193 !(le32_to_cpu(es->s_feature_incompat) &
2194 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2195 ext3_msg(sb, KERN_ERR, "error: external journal has "
2196 "bad superblock");
2197 brelse(bh);
2198 goto out_bdev;
2199 }
2200
2201 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2202 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
2203 brelse(bh);
2204 goto out_bdev;
2205 }
2206
2207 len = le32_to_cpu(es->s_blocks_count);
2208 start = sb_block + 1;
2209 brelse(bh); /* we're done with the superblock */
2210
2211 journal = journal_init_dev(bdev, sb->s_bdev,
2212 start, len, blocksize);
2213 if (!journal) {
2214 ext3_msg(sb, KERN_ERR,
2215 "error: failed to create device journal");
2216 goto out_bdev;
2217 }
2218 journal->j_private = sb;
2219 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2220 wait_on_buffer(journal->j_sb_buffer);
2221 if (!buffer_uptodate(journal->j_sb_buffer)) {
2222 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2223 goto out_journal;
2224 }
2225 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2226 ext3_msg(sb, KERN_ERR,
2227 "error: external journal has more than one "
2228 "user (unsupported) - %d",
2229 be32_to_cpu(journal->j_superblock->s_nr_users));
2230 goto out_journal;
2231 }
2232 EXT3_SB(sb)->journal_bdev = bdev;
2233 ext3_init_journal_params(sb, journal);
2234 return journal;
2235 out_journal:
2236 journal_destroy(journal);
2237 out_bdev:
2238 ext3_blkdev_put(bdev);
2239 return NULL;
2240 }
2241
2242 static int ext3_load_journal(struct super_block *sb,
2243 struct ext3_super_block *es,
2244 unsigned long journal_devnum)
2245 {
2246 journal_t *journal;
2247 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2248 dev_t journal_dev;
2249 int err = 0;
2250 int really_read_only;
2251
2252 if (journal_devnum &&
2253 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2254 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2255 "numbers have changed");
2256 journal_dev = new_decode_dev(journal_devnum);
2257 } else
2258 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2259
2260 really_read_only = bdev_read_only(sb->s_bdev);
2261
2262 /*
2263 * Are we loading a blank journal or performing recovery after a
2264 * crash? For recovery, we need to check in advance whether we
2265 * can get read-write access to the device.
2266 */
2267
2268 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2269 if (sb->s_flags & MS_RDONLY) {
2270 ext3_msg(sb, KERN_INFO,
2271 "recovery required on readonly filesystem");
2272 if (really_read_only) {
2273 ext3_msg(sb, KERN_ERR, "error: write access "
2274 "unavailable, cannot proceed");
2275 return -EROFS;
2276 }
2277 ext3_msg(sb, KERN_INFO,
2278 "write access will be enabled during recovery");
2279 }
2280 }
2281
2282 if (journal_inum && journal_dev) {
2283 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2284 "and inode journals");
2285 return -EINVAL;
2286 }
2287
2288 if (journal_inum) {
2289 if (!(journal = ext3_get_journal(sb, journal_inum)))
2290 return -EINVAL;
2291 } else {
2292 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2293 return -EINVAL;
2294 }
2295
2296 if (!(journal->j_flags & JFS_BARRIER))
2297 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2298
2299 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2300 err = journal_update_format(journal);
2301 if (err) {
2302 ext3_msg(sb, KERN_ERR, "error updating journal");
2303 journal_destroy(journal);
2304 return err;
2305 }
2306 }
2307
2308 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2309 err = journal_wipe(journal, !really_read_only);
2310 if (!err)
2311 err = journal_load(journal);
2312
2313 if (err) {
2314 ext3_msg(sb, KERN_ERR, "error loading journal");
2315 journal_destroy(journal);
2316 return err;
2317 }
2318
2319 EXT3_SB(sb)->s_journal = journal;
2320 ext3_clear_journal_err(sb, es);
2321
2322 if (!really_read_only && journal_devnum &&
2323 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2324 es->s_journal_dev = cpu_to_le32(journal_devnum);
2325
2326 /* Make sure we flush the recovery flag to disk. */
2327 ext3_commit_super(sb, es, 1);
2328 }
2329
2330 return 0;
2331 }
2332
2333 static int ext3_create_journal(struct super_block *sb,
2334 struct ext3_super_block *es,
2335 unsigned int journal_inum)
2336 {
2337 journal_t *journal;
2338 int err;
2339
2340 if (sb->s_flags & MS_RDONLY) {
2341 ext3_msg(sb, KERN_ERR,
2342 "error: readonly filesystem when trying to "
2343 "create journal");
2344 return -EROFS;
2345 }
2346
2347 journal = ext3_get_journal(sb, journal_inum);
2348 if (!journal)
2349 return -EINVAL;
2350
2351 ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
2352 journal_inum);
2353
2354 err = journal_create(journal);
2355 if (err) {
2356 ext3_msg(sb, KERN_ERR, "error creating journal");
2357 journal_destroy(journal);
2358 return -EIO;
2359 }
2360
2361 EXT3_SB(sb)->s_journal = journal;
2362
2363 ext3_update_dynamic_rev(sb);
2364 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2365 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2366
2367 es->s_journal_inum = cpu_to_le32(journal_inum);
2368
2369 /* Make sure we flush the recovery flag to disk. */
2370 ext3_commit_super(sb, es, 1);
2371
2372 return 0;
2373 }
2374
2375 static int ext3_commit_super(struct super_block *sb,
2376 struct ext3_super_block *es,
2377 int sync)
2378 {
2379 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2380 int error = 0;
2381
2382 if (!sbh)
2383 return error;
2384
2385 if (buffer_write_io_error(sbh)) {
2386 /*
2387 * Oh, dear. A previous attempt to write the
2388 * superblock failed. This could happen because the
2389 * USB device was yanked out. Or it could happen to
2390 * be a transient write error and maybe the block will
2391 * be remapped. Nothing we can do but to retry the
2392 * write and hope for the best.
2393 */
2394 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2395 "superblock detected");
2396 clear_buffer_write_io_error(sbh);
2397 set_buffer_uptodate(sbh);
2398 }
2399 /*
2400 * If the file system is mounted read-only, don't update the
2401 * superblock write time. This avoids updating the superblock
2402 * write time when we are mounting the root file system
2403 * read/only but we need to replay the journal; at that point,
2404 * for people who are east of GMT and who make their clock
2405 * tick in localtime for Windows bug-for-bug compatibility,
2406 * the clock is set in the future, and this will cause e2fsck
2407 * to complain and force a full file system check.
2408 */
2409 if (!(sb->s_flags & MS_RDONLY))
2410 es->s_wtime = cpu_to_le32(get_seconds());
2411 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2412 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2413 BUFFER_TRACE(sbh, "marking dirty");
2414 mark_buffer_dirty(sbh);
2415 if (sync) {
2416 error = sync_dirty_buffer(sbh);
2417 if (buffer_write_io_error(sbh)) {
2418 ext3_msg(sb, KERN_ERR, "I/O error while writing "
2419 "superblock");
2420 clear_buffer_write_io_error(sbh);
2421 set_buffer_uptodate(sbh);
2422 }
2423 }
2424 return error;
2425 }
2426
2427
2428 /*
2429 * Have we just finished recovery? If so, and if we are mounting (or
2430 * remounting) the filesystem readonly, then we will end up with a
2431 * consistent fs on disk. Record that fact.
2432 */
2433 static void ext3_mark_recovery_complete(struct super_block * sb,
2434 struct ext3_super_block * es)
2435 {
2436 journal_t *journal = EXT3_SB(sb)->s_journal;
2437
2438 journal_lock_updates(journal);
2439 if (journal_flush(journal) < 0)
2440 goto out;
2441
2442 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2443 sb->s_flags & MS_RDONLY) {
2444 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2445 ext3_commit_super(sb, es, 1);
2446 }
2447
2448 out:
2449 journal_unlock_updates(journal);
2450 }
2451
2452 /*
2453 * If we are mounting (or read-write remounting) a filesystem whose journal
2454 * has recorded an error from a previous lifetime, move that error to the
2455 * main filesystem now.
2456 */
2457 static void ext3_clear_journal_err(struct super_block *sb,
2458 struct ext3_super_block *es)
2459 {
2460 journal_t *journal;
2461 int j_errno;
2462 const char *errstr;
2463
2464 journal = EXT3_SB(sb)->s_journal;
2465
2466 /*
2467 * Now check for any error status which may have been recorded in the
2468 * journal by a prior ext3_error() or ext3_abort()
2469 */
2470
2471 j_errno = journal_errno(journal);
2472 if (j_errno) {
2473 char nbuf[16];
2474
2475 errstr = ext3_decode_error(sb, j_errno, nbuf);
2476 ext3_warning(sb, __func__, "Filesystem error recorded "
2477 "from previous mount: %s", errstr);
2478 ext3_warning(sb, __func__, "Marking fs in need of "
2479 "filesystem check.");
2480
2481 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2482 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2483 ext3_commit_super (sb, es, 1);
2484
2485 journal_clear_err(journal);
2486 }
2487 }
2488
2489 /*
2490 * Force the running and committing transactions to commit,
2491 * and wait on the commit.
2492 */
2493 int ext3_force_commit(struct super_block *sb)
2494 {
2495 journal_t *journal;
2496 int ret;
2497
2498 if (sb->s_flags & MS_RDONLY)
2499 return 0;
2500
2501 journal = EXT3_SB(sb)->s_journal;
2502 ret = ext3_journal_force_commit(journal);
2503 return ret;
2504 }
2505
2506 static int ext3_sync_fs(struct super_block *sb, int wait)
2507 {
2508 tid_t target;
2509
2510 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2511 if (wait)
2512 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2513 }
2514 return 0;
2515 }
2516
2517 /*
2518 * LVM calls this function before a (read-only) snapshot is created. This
2519 * gives us a chance to flush the journal completely and mark the fs clean.
2520 */
2521 static int ext3_freeze(struct super_block *sb)
2522 {
2523 int error = 0;
2524 journal_t *journal;
2525
2526 if (!(sb->s_flags & MS_RDONLY)) {
2527 journal = EXT3_SB(sb)->s_journal;
2528
2529 /* Now we set up the journal barrier. */
2530 journal_lock_updates(journal);
2531
2532 /*
2533 * We don't want to clear needs_recovery flag when we failed
2534 * to flush the journal.
2535 */
2536 error = journal_flush(journal);
2537 if (error < 0)
2538 goto out;
2539
2540 /* Journal blocked and flushed, clear needs_recovery flag. */
2541 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2542 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2543 if (error)
2544 goto out;
2545 }
2546 return 0;
2547
2548 out:
2549 journal_unlock_updates(journal);
2550 return error;
2551 }
2552
2553 /*
2554 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2555 * flag here, even though the filesystem is not technically dirty yet.
2556 */
2557 static int ext3_unfreeze(struct super_block *sb)
2558 {
2559 if (!(sb->s_flags & MS_RDONLY)) {
2560 lock_super(sb);
2561 /* Reser the needs_recovery flag before the fs is unlocked. */
2562 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2563 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2564 unlock_super(sb);
2565 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2566 }
2567 return 0;
2568 }
2569
2570 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2571 {
2572 struct ext3_super_block * es;
2573 struct ext3_sb_info *sbi = EXT3_SB(sb);
2574 ext3_fsblk_t n_blocks_count = 0;
2575 unsigned long old_sb_flags;
2576 struct ext3_mount_options old_opts;
2577 int enable_quota = 0;
2578 int err;
2579 #ifdef CONFIG_QUOTA
2580 int i;
2581 #endif
2582
2583 /* Store the original options */
2584 lock_super(sb);
2585 old_sb_flags = sb->s_flags;
2586 old_opts.s_mount_opt = sbi->s_mount_opt;
2587 old_opts.s_resuid = sbi->s_resuid;
2588 old_opts.s_resgid = sbi->s_resgid;
2589 old_opts.s_commit_interval = sbi->s_commit_interval;
2590 #ifdef CONFIG_QUOTA
2591 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2592 for (i = 0; i < MAXQUOTAS; i++)
2593 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2594 #endif
2595
2596 /*
2597 * Allow the "check" option to be passed as a remount option.
2598 */
2599 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2600 err = -EINVAL;
2601 goto restore_opts;
2602 }
2603
2604 if (test_opt(sb, ABORT))
2605 ext3_abort(sb, __func__, "Abort forced by user");
2606
2607 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2608 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2609
2610 es = sbi->s_es;
2611
2612 ext3_init_journal_params(sb, sbi->s_journal);
2613
2614 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2615 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2616 if (test_opt(sb, ABORT)) {
2617 err = -EROFS;
2618 goto restore_opts;
2619 }
2620
2621 if (*flags & MS_RDONLY) {
2622 err = dquot_suspend(sb, -1);
2623 if (err < 0)
2624 goto restore_opts;
2625
2626 /*
2627 * First of all, the unconditional stuff we have to do
2628 * to disable replay of the journal when we next remount
2629 */
2630 sb->s_flags |= MS_RDONLY;
2631
2632 /*
2633 * OK, test if we are remounting a valid rw partition
2634 * readonly, and if so set the rdonly flag and then
2635 * mark the partition as valid again.
2636 */
2637 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2638 (sbi->s_mount_state & EXT3_VALID_FS))
2639 es->s_state = cpu_to_le16(sbi->s_mount_state);
2640
2641 ext3_mark_recovery_complete(sb, es);
2642 } else {
2643 __le32 ret;
2644 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2645 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2646 ext3_msg(sb, KERN_WARNING,
2647 "warning: couldn't remount RDWR "
2648 "because of unsupported optional "
2649 "features (%x)", le32_to_cpu(ret));
2650 err = -EROFS;
2651 goto restore_opts;
2652 }
2653
2654 /*
2655 * If we have an unprocessed orphan list hanging
2656 * around from a previously readonly bdev mount,
2657 * require a full umount/remount for now.
2658 */
2659 if (es->s_last_orphan) {
2660 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
2661 "remount RDWR because of unprocessed "
2662 "orphan inode list. Please "
2663 "umount/remount instead.");
2664 err = -EINVAL;
2665 goto restore_opts;
2666 }
2667
2668 /*
2669 * Mounting a RDONLY partition read-write, so reread
2670 * and store the current valid flag. (It may have
2671 * been changed by e2fsck since we originally mounted
2672 * the partition.)
2673 */
2674 ext3_clear_journal_err(sb, es);
2675 sbi->s_mount_state = le16_to_cpu(es->s_state);
2676 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2677 goto restore_opts;
2678 if (!ext3_setup_super (sb, es, 0))
2679 sb->s_flags &= ~MS_RDONLY;
2680 enable_quota = 1;
2681 }
2682 }
2683 #ifdef CONFIG_QUOTA
2684 /* Release old quota file names */
2685 for (i = 0; i < MAXQUOTAS; i++)
2686 if (old_opts.s_qf_names[i] &&
2687 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2688 kfree(old_opts.s_qf_names[i]);
2689 #endif
2690 unlock_super(sb);
2691
2692 if (enable_quota)
2693 dquot_resume(sb, -1);
2694 return 0;
2695 restore_opts:
2696 sb->s_flags = old_sb_flags;
2697 sbi->s_mount_opt = old_opts.s_mount_opt;
2698 sbi->s_resuid = old_opts.s_resuid;
2699 sbi->s_resgid = old_opts.s_resgid;
2700 sbi->s_commit_interval = old_opts.s_commit_interval;
2701 #ifdef CONFIG_QUOTA
2702 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2703 for (i = 0; i < MAXQUOTAS; i++) {
2704 if (sbi->s_qf_names[i] &&
2705 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2706 kfree(sbi->s_qf_names[i]);
2707 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2708 }
2709 #endif
2710 unlock_super(sb);
2711 return err;
2712 }
2713
2714 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2715 {
2716 struct super_block *sb = dentry->d_sb;
2717 struct ext3_sb_info *sbi = EXT3_SB(sb);
2718 struct ext3_super_block *es = sbi->s_es;
2719 u64 fsid;
2720
2721 if (test_opt(sb, MINIX_DF)) {
2722 sbi->s_overhead_last = 0;
2723 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2724 unsigned long ngroups = sbi->s_groups_count, i;
2725 ext3_fsblk_t overhead = 0;
2726 smp_rmb();
2727
2728 /*
2729 * Compute the overhead (FS structures). This is constant
2730 * for a given filesystem unless the number of block groups
2731 * changes so we cache the previous value until it does.
2732 */
2733
2734 /*
2735 * All of the blocks before first_data_block are
2736 * overhead
2737 */
2738 overhead = le32_to_cpu(es->s_first_data_block);
2739
2740 /*
2741 * Add the overhead attributed to the superblock and
2742 * block group descriptors. If the sparse superblocks
2743 * feature is turned on, then not all groups have this.
2744 */
2745 for (i = 0; i < ngroups; i++) {
2746 overhead += ext3_bg_has_super(sb, i) +
2747 ext3_bg_num_gdb(sb, i);
2748 cond_resched();
2749 }
2750
2751 /*
2752 * Every block group has an inode bitmap, a block
2753 * bitmap, and an inode table.
2754 */
2755 overhead += ngroups * (2 + sbi->s_itb_per_group);
2756 sbi->s_overhead_last = overhead;
2757 smp_wmb();
2758 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2759 }
2760
2761 buf->f_type = EXT3_SUPER_MAGIC;
2762 buf->f_bsize = sb->s_blocksize;
2763 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2764 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2765 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2766 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2767 buf->f_bavail = 0;
2768 buf->f_files = le32_to_cpu(es->s_inodes_count);
2769 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2770 buf->f_namelen = EXT3_NAME_LEN;
2771 fsid = le64_to_cpup((void *)es->s_uuid) ^
2772 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2773 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2774 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2775 return 0;
2776 }
2777
2778 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2779 * is locked for write. Otherwise the are possible deadlocks:
2780 * Process 1 Process 2
2781 * ext3_create() quota_sync()
2782 * journal_start() write_dquot()
2783 * dquot_initialize() down(dqio_mutex)
2784 * down(dqio_mutex) journal_start()
2785 *
2786 */
2787
2788 #ifdef CONFIG_QUOTA
2789
2790 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2791 {
2792 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2793 }
2794
2795 static int ext3_write_dquot(struct dquot *dquot)
2796 {
2797 int ret, err;
2798 handle_t *handle;
2799 struct inode *inode;
2800
2801 inode = dquot_to_inode(dquot);
2802 handle = ext3_journal_start(inode,
2803 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2804 if (IS_ERR(handle))
2805 return PTR_ERR(handle);
2806 ret = dquot_commit(dquot);
2807 err = ext3_journal_stop(handle);
2808 if (!ret)
2809 ret = err;
2810 return ret;
2811 }
2812
2813 static int ext3_acquire_dquot(struct dquot *dquot)
2814 {
2815 int ret, err;
2816 handle_t *handle;
2817
2818 handle = ext3_journal_start(dquot_to_inode(dquot),
2819 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2820 if (IS_ERR(handle))
2821 return PTR_ERR(handle);
2822 ret = dquot_acquire(dquot);
2823 err = ext3_journal_stop(handle);
2824 if (!ret)
2825 ret = err;
2826 return ret;
2827 }
2828
2829 static int ext3_release_dquot(struct dquot *dquot)
2830 {
2831 int ret, err;
2832 handle_t *handle;
2833
2834 handle = ext3_journal_start(dquot_to_inode(dquot),
2835 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2836 if (IS_ERR(handle)) {
2837 /* Release dquot anyway to avoid endless cycle in dqput() */
2838 dquot_release(dquot);
2839 return PTR_ERR(handle);
2840 }
2841 ret = dquot_release(dquot);
2842 err = ext3_journal_stop(handle);
2843 if (!ret)
2844 ret = err;
2845 return ret;
2846 }
2847
2848 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2849 {
2850 /* Are we journaling quotas? */
2851 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2852 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2853 dquot_mark_dquot_dirty(dquot);
2854 return ext3_write_dquot(dquot);
2855 } else {
2856 return dquot_mark_dquot_dirty(dquot);
2857 }
2858 }
2859
2860 static int ext3_write_info(struct super_block *sb, int type)
2861 {
2862 int ret, err;
2863 handle_t *handle;
2864
2865 /* Data block + inode block */
2866 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2867 if (IS_ERR(handle))
2868 return PTR_ERR(handle);
2869 ret = dquot_commit_info(sb, type);
2870 err = ext3_journal_stop(handle);
2871 if (!ret)
2872 ret = err;
2873 return ret;
2874 }
2875
2876 /*
2877 * Turn on quotas during mount time - we need to find
2878 * the quota file and such...
2879 */
2880 static int ext3_quota_on_mount(struct super_block *sb, int type)
2881 {
2882 return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2883 EXT3_SB(sb)->s_jquota_fmt, type);
2884 }
2885
2886 /*
2887 * Standard function to be called on quota_on
2888 */
2889 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2890 struct path *path)
2891 {
2892 int err;
2893
2894 if (!test_opt(sb, QUOTA))
2895 return -EINVAL;
2896
2897 /* Quotafile not on the same filesystem? */
2898 if (path->mnt->mnt_sb != sb)
2899 return -EXDEV;
2900 /* Journaling quota? */
2901 if (EXT3_SB(sb)->s_qf_names[type]) {
2902 /* Quotafile not of fs root? */
2903 if (path->dentry->d_parent != sb->s_root)
2904 ext3_msg(sb, KERN_WARNING,
2905 "warning: Quota file not on filesystem root. "
2906 "Journaled quota will not work.");
2907 }
2908
2909 /*
2910 * When we journal data on quota file, we have to flush journal to see
2911 * all updates to the file when we bypass pagecache...
2912 */
2913 if (ext3_should_journal_data(path->dentry->d_inode)) {
2914 /*
2915 * We don't need to lock updates but journal_flush() could
2916 * otherwise be livelocked...
2917 */
2918 journal_lock_updates(EXT3_SB(sb)->s_journal);
2919 err = journal_flush(EXT3_SB(sb)->s_journal);
2920 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2921 if (err)
2922 return err;
2923 }
2924
2925 return dquot_quota_on(sb, type, format_id, path);
2926 }
2927
2928 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2929 * acquiring the locks... As quota files are never truncated and quota code
2930 * itself serializes the operations (and no one else should touch the files)
2931 * we don't have to be afraid of races */
2932 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2933 size_t len, loff_t off)
2934 {
2935 struct inode *inode = sb_dqopt(sb)->files[type];
2936 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2937 int err = 0;
2938 int offset = off & (sb->s_blocksize - 1);
2939 int tocopy;
2940 size_t toread;
2941 struct buffer_head *bh;
2942 loff_t i_size = i_size_read(inode);
2943
2944 if (off > i_size)
2945 return 0;
2946 if (off+len > i_size)
2947 len = i_size-off;
2948 toread = len;
2949 while (toread > 0) {
2950 tocopy = sb->s_blocksize - offset < toread ?
2951 sb->s_blocksize - offset : toread;
2952 bh = ext3_bread(NULL, inode, blk, 0, &err);
2953 if (err)
2954 return err;
2955 if (!bh) /* A hole? */
2956 memset(data, 0, tocopy);
2957 else
2958 memcpy(data, bh->b_data+offset, tocopy);
2959 brelse(bh);
2960 offset = 0;
2961 toread -= tocopy;
2962 data += tocopy;
2963 blk++;
2964 }
2965 return len;
2966 }
2967
2968 /* Write to quotafile (we know the transaction is already started and has
2969 * enough credits) */
2970 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2971 const char *data, size_t len, loff_t off)
2972 {
2973 struct inode *inode = sb_dqopt(sb)->files[type];
2974 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2975 int err = 0;
2976 int offset = off & (sb->s_blocksize - 1);
2977 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2978 struct buffer_head *bh;
2979 handle_t *handle = journal_current_handle();
2980
2981 if (!handle) {
2982 ext3_msg(sb, KERN_WARNING,
2983 "warning: quota write (off=%llu, len=%llu)"
2984 " cancelled because transaction is not started.",
2985 (unsigned long long)off, (unsigned long long)len);
2986 return -EIO;
2987 }
2988
2989 /*
2990 * Since we account only one data block in transaction credits,
2991 * then it is impossible to cross a block boundary.
2992 */
2993 if (sb->s_blocksize - offset < len) {
2994 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
2995 " cancelled because not block aligned",
2996 (unsigned long long)off, (unsigned long long)len);
2997 return -EIO;
2998 }
2999 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3000 bh = ext3_bread(handle, inode, blk, 1, &err);
3001 if (!bh)
3002 goto out;
3003 if (journal_quota) {
3004 err = ext3_journal_get_write_access(handle, bh);
3005 if (err) {
3006 brelse(bh);
3007 goto out;
3008 }
3009 }
3010 lock_buffer(bh);
3011 memcpy(bh->b_data+offset, data, len);
3012 flush_dcache_page(bh->b_page);
3013 unlock_buffer(bh);
3014 if (journal_quota)
3015 err = ext3_journal_dirty_metadata(handle, bh);
3016 else {
3017 /* Always do at least ordered writes for quotas */
3018 err = ext3_journal_dirty_data(handle, bh);
3019 mark_buffer_dirty(bh);
3020 }
3021 brelse(bh);
3022 out:
3023 if (err) {
3024 mutex_unlock(&inode->i_mutex);
3025 return err;
3026 }
3027 if (inode->i_size < off + len) {
3028 i_size_write(inode, off + len);
3029 EXT3_I(inode)->i_disksize = inode->i_size;
3030 }
3031 inode->i_version++;
3032 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3033 ext3_mark_inode_dirty(handle, inode);
3034 mutex_unlock(&inode->i_mutex);
3035 return len;
3036 }
3037
3038 #endif
3039
3040 static struct dentry *ext3_mount(struct file_system_type *fs_type,
3041 int flags, const char *dev_name, void *data)
3042 {
3043 return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
3044 }
3045
3046 static struct file_system_type ext3_fs_type = {
3047 .owner = THIS_MODULE,
3048 .name = "ext3",
3049 .mount = ext3_mount,
3050 .kill_sb = kill_block_super,
3051 .fs_flags = FS_REQUIRES_DEV,
3052 };
3053
3054 static int __init init_ext3_fs(void)
3055 {
3056 int err = init_ext3_xattr();
3057 if (err)
3058 return err;
3059 err = init_inodecache();
3060 if (err)
3061 goto out1;
3062 err = register_filesystem(&ext3_fs_type);
3063 if (err)
3064 goto out;
3065 return 0;
3066 out:
3067 destroy_inodecache();
3068 out1:
3069 exit_ext3_xattr();
3070 return err;
3071 }
3072
3073 static void __exit exit_ext3_fs(void)
3074 {
3075 unregister_filesystem(&ext3_fs_type);
3076 destroy_inodecache();
3077 exit_ext3_xattr();
3078 }
3079
3080 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3081 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3082 MODULE_LICENSE("GPL");
3083 module_init(init_ext3_fs)
3084 module_exit(exit_ext3_fs)
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree