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ext3: provide function to release metadata pages under memory pressure
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ext3 / super.c
blob6900ff05e3ab1d392def2418f909251762533814
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/smp_lock.h>
31 #include <linux/buffer_head.h>
32 #include <linux/exportfs.h>
33 #include <linux/vfs.h>
34 #include <linux/random.h>
35 #include <linux/mount.h>
36 #include <linux/namei.h>
37 #include <linux/quotaops.h>
38 #include <linux/seq_file.h>
39 #include <linux/log2.h>
40
41 #include <asm/uaccess.h>
42
43 #include "xattr.h"
44 #include "acl.h"
45 #include "namei.h"
46
47 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
48 unsigned long journal_devnum);
49 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
50 unsigned int);
51 static void ext3_commit_super (struct super_block * sb,
52 struct ext3_super_block * es,
53 int sync);
54 static void ext3_mark_recovery_complete(struct super_block * sb,
55 struct ext3_super_block * es);
56 static void ext3_clear_journal_err(struct super_block * sb,
57 struct ext3_super_block * es);
58 static int ext3_sync_fs(struct super_block *sb, int wait);
59 static const char *ext3_decode_error(struct super_block * sb, int errno,
60 char nbuf[16]);
61 static int ext3_remount (struct super_block * sb, int * flags, char * data);
62 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
63 static void ext3_unlockfs(struct super_block *sb);
64 static void ext3_write_super (struct super_block * sb);
65 static void ext3_write_super_lockfs(struct super_block *sb);
66
67 /*
68 * Wrappers for journal_start/end.
69 *
70 * The only special thing we need to do here is to make sure that all
71 * journal_end calls result in the superblock being marked dirty, so
72 * that sync() will call the filesystem's write_super callback if
73 * appropriate.
74 */
75 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
76 {
77 journal_t *journal;
78
79 if (sb->s_flags & MS_RDONLY)
80 return ERR_PTR(-EROFS);
81
82 /* Special case here: if the journal has aborted behind our
83 * backs (eg. EIO in the commit thread), then we still need to
84 * take the FS itself readonly cleanly. */
85 journal = EXT3_SB(sb)->s_journal;
86 if (is_journal_aborted(journal)) {
87 ext3_abort(sb, __func__,
88 "Detected aborted journal");
89 return ERR_PTR(-EROFS);
90 }
91
92 return journal_start(journal, nblocks);
93 }
94
95 /*
96 * The only special thing we need to do here is to make sure that all
97 * journal_stop calls result in the superblock being marked dirty, so
98 * that sync() will call the filesystem's write_super callback if
99 * appropriate.
100 */
101 int __ext3_journal_stop(const char *where, handle_t *handle)
102 {
103 struct super_block *sb;
104 int err;
105 int rc;
106
107 sb = handle->h_transaction->t_journal->j_private;
108 err = handle->h_err;
109 rc = journal_stop(handle);
110
111 if (!err)
112 err = rc;
113 if (err)
114 __ext3_std_error(sb, where, err);
115 return err;
116 }
117
118 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
119 struct buffer_head *bh, handle_t *handle, int err)
120 {
121 char nbuf[16];
122 const char *errstr = ext3_decode_error(NULL, err, nbuf);
123
124 if (bh)
125 BUFFER_TRACE(bh, "abort");
126
127 if (!handle->h_err)
128 handle->h_err = err;
129
130 if (is_handle_aborted(handle))
131 return;
132
133 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
134 caller, errstr, err_fn);
135
136 journal_abort_handle(handle);
137 }
138
139 /* Deal with the reporting of failure conditions on a filesystem such as
140 * inconsistencies detected or read IO failures.
141 *
142 * On ext2, we can store the error state of the filesystem in the
143 * superblock. That is not possible on ext3, because we may have other
144 * write ordering constraints on the superblock which prevent us from
145 * writing it out straight away; and given that the journal is about to
146 * be aborted, we can't rely on the current, or future, transactions to
147 * write out the superblock safely.
148 *
149 * We'll just use the journal_abort() error code to record an error in
150 * the journal instead. On recovery, the journal will compain about
151 * that error until we've noted it down and cleared it.
152 */
153
154 static void ext3_handle_error(struct super_block *sb)
155 {
156 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
157
158 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
159 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
160
161 if (sb->s_flags & MS_RDONLY)
162 return;
163
164 if (!test_opt (sb, ERRORS_CONT)) {
165 journal_t *journal = EXT3_SB(sb)->s_journal;
166
167 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
168 if (journal)
169 journal_abort(journal, -EIO);
170 }
171 if (test_opt (sb, ERRORS_RO)) {
172 printk (KERN_CRIT "Remounting filesystem read-only\n");
173 sb->s_flags |= MS_RDONLY;
174 }
175 ext3_commit_super(sb, es, 1);
176 if (test_opt(sb, ERRORS_PANIC))
177 panic("EXT3-fs (device %s): panic forced after error\n",
178 sb->s_id);
179 }
180
181 void ext3_error (struct super_block * sb, const char * function,
182 const char * fmt, ...)
183 {
184 va_list args;
185
186 va_start(args, fmt);
187 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
188 vprintk(fmt, args);
189 printk("\n");
190 va_end(args);
191
192 ext3_handle_error(sb);
193 }
194
195 static const char *ext3_decode_error(struct super_block * sb, int errno,
196 char nbuf[16])
197 {
198 char *errstr = NULL;
199
200 switch (errno) {
201 case -EIO:
202 errstr = "IO failure";
203 break;
204 case -ENOMEM:
205 errstr = "Out of memory";
206 break;
207 case -EROFS:
208 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
209 errstr = "Journal has aborted";
210 else
211 errstr = "Readonly filesystem";
212 break;
213 default:
214 /* If the caller passed in an extra buffer for unknown
215 * errors, textualise them now. Else we just return
216 * NULL. */
217 if (nbuf) {
218 /* Check for truncated error codes... */
219 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
220 errstr = nbuf;
221 }
222 break;
223 }
224
225 return errstr;
226 }
227
228 /* __ext3_std_error decodes expected errors from journaling functions
229 * automatically and invokes the appropriate error response. */
230
231 void __ext3_std_error (struct super_block * sb, const char * function,
232 int errno)
233 {
234 char nbuf[16];
235 const char *errstr;
236
237 /* Special case: if the error is EROFS, and we're not already
238 * inside a transaction, then there's really no point in logging
239 * an error. */
240 if (errno == -EROFS && journal_current_handle() == NULL &&
241 (sb->s_flags & MS_RDONLY))
242 return;
243
244 errstr = ext3_decode_error(sb, errno, nbuf);
245 printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
246 sb->s_id, function, errstr);
247
248 ext3_handle_error(sb);
249 }
250
251 /*
252 * ext3_abort is a much stronger failure handler than ext3_error. The
253 * abort function may be used to deal with unrecoverable failures such
254 * as journal IO errors or ENOMEM at a critical moment in log management.
255 *
256 * We unconditionally force the filesystem into an ABORT|READONLY state,
257 * unless the error response on the fs has been set to panic in which
258 * case we take the easy way out and panic immediately.
259 */
260
261 void ext3_abort (struct super_block * sb, const char * function,
262 const char * fmt, ...)
263 {
264 va_list args;
265
266 printk (KERN_CRIT "ext3_abort called.\n");
267
268 va_start(args, fmt);
269 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
270 vprintk(fmt, args);
271 printk("\n");
272 va_end(args);
273
274 if (test_opt(sb, ERRORS_PANIC))
275 panic("EXT3-fs panic from previous error\n");
276
277 if (sb->s_flags & MS_RDONLY)
278 return;
279
280 printk(KERN_CRIT "Remounting filesystem read-only\n");
281 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
282 sb->s_flags |= MS_RDONLY;
283 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
284 if (EXT3_SB(sb)->s_journal)
285 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
286 }
287
288 void ext3_warning (struct super_block * sb, const char * function,
289 const char * fmt, ...)
290 {
291 va_list args;
292
293 va_start(args, fmt);
294 printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
295 sb->s_id, function);
296 vprintk(fmt, args);
297 printk("\n");
298 va_end(args);
299 }
300
301 void ext3_update_dynamic_rev(struct super_block *sb)
302 {
303 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
304
305 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
306 return;
307
308 ext3_warning(sb, __func__,
309 "updating to rev %d because of new feature flag, "
310 "running e2fsck is recommended",
311 EXT3_DYNAMIC_REV);
312
313 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
314 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
315 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
316 /* leave es->s_feature_*compat flags alone */
317 /* es->s_uuid will be set by e2fsck if empty */
318
319 /*
320 * The rest of the superblock fields should be zero, and if not it
321 * means they are likely already in use, so leave them alone. We
322 * can leave it up to e2fsck to clean up any inconsistencies there.
323 */
324 }
325
326 /*
327 * Open the external journal device
328 */
329 static struct block_device *ext3_blkdev_get(dev_t dev)
330 {
331 struct block_device *bdev;
332 char b[BDEVNAME_SIZE];
333
334 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
335 if (IS_ERR(bdev))
336 goto fail;
337 return bdev;
338
339 fail:
340 printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
341 __bdevname(dev, b), PTR_ERR(bdev));
342 return NULL;
343 }
344
345 /*
346 * Release the journal device
347 */
348 static int ext3_blkdev_put(struct block_device *bdev)
349 {
350 bd_release(bdev);
351 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
352 }
353
354 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
355 {
356 struct block_device *bdev;
357 int ret = -ENODEV;
358
359 bdev = sbi->journal_bdev;
360 if (bdev) {
361 ret = ext3_blkdev_put(bdev);
362 sbi->journal_bdev = NULL;
363 }
364 return ret;
365 }
366
367 static inline struct inode *orphan_list_entry(struct list_head *l)
368 {
369 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
370 }
371
372 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
373 {
374 struct list_head *l;
375
376 printk(KERN_ERR "sb orphan head is %d\n",
377 le32_to_cpu(sbi->s_es->s_last_orphan));
378
379 printk(KERN_ERR "sb_info orphan list:\n");
380 list_for_each(l, &sbi->s_orphan) {
381 struct inode *inode = orphan_list_entry(l);
382 printk(KERN_ERR " "
383 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
384 inode->i_sb->s_id, inode->i_ino, inode,
385 inode->i_mode, inode->i_nlink,
386 NEXT_ORPHAN(inode));
387 }
388 }
389
390 static void ext3_put_super (struct super_block * sb)
391 {
392 struct ext3_sb_info *sbi = EXT3_SB(sb);
393 struct ext3_super_block *es = sbi->s_es;
394 int i, err;
395
396 ext3_xattr_put_super(sb);
397 err = journal_destroy(sbi->s_journal);
398 sbi->s_journal = NULL;
399 if (err < 0)
400 ext3_abort(sb, __func__, "Couldn't clean up the journal");
401
402 if (!(sb->s_flags & MS_RDONLY)) {
403 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
404 es->s_state = cpu_to_le16(sbi->s_mount_state);
405 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
406 mark_buffer_dirty(sbi->s_sbh);
407 ext3_commit_super(sb, es, 1);
408 }
409
410 for (i = 0; i < sbi->s_gdb_count; i++)
411 brelse(sbi->s_group_desc[i]);
412 kfree(sbi->s_group_desc);
413 percpu_counter_destroy(&sbi->s_freeblocks_counter);
414 percpu_counter_destroy(&sbi->s_freeinodes_counter);
415 percpu_counter_destroy(&sbi->s_dirs_counter);
416 brelse(sbi->s_sbh);
417 #ifdef CONFIG_QUOTA
418 for (i = 0; i < MAXQUOTAS; i++)
419 kfree(sbi->s_qf_names[i]);
420 #endif
421
422 /* Debugging code just in case the in-memory inode orphan list
423 * isn't empty. The on-disk one can be non-empty if we've
424 * detected an error and taken the fs readonly, but the
425 * in-memory list had better be clean by this point. */
426 if (!list_empty(&sbi->s_orphan))
427 dump_orphan_list(sb, sbi);
428 J_ASSERT(list_empty(&sbi->s_orphan));
429
430 invalidate_bdev(sb->s_bdev);
431 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
432 /*
433 * Invalidate the journal device's buffers. We don't want them
434 * floating about in memory - the physical journal device may
435 * hotswapped, and it breaks the `ro-after' testing code.
436 */
437 sync_blockdev(sbi->journal_bdev);
438 invalidate_bdev(sbi->journal_bdev);
439 ext3_blkdev_remove(sbi);
440 }
441 sb->s_fs_info = NULL;
442 kfree(sbi);
443 return;
444 }
445
446 static struct kmem_cache *ext3_inode_cachep;
447
448 /*
449 * Called inside transaction, so use GFP_NOFS
450 */
451 static struct inode *ext3_alloc_inode(struct super_block *sb)
452 {
453 struct ext3_inode_info *ei;
454
455 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
456 if (!ei)
457 return NULL;
458 #ifdef CONFIG_EXT3_FS_POSIX_ACL
459 ei->i_acl = EXT3_ACL_NOT_CACHED;
460 ei->i_default_acl = EXT3_ACL_NOT_CACHED;
461 #endif
462 ei->i_block_alloc_info = NULL;
463 ei->vfs_inode.i_version = 1;
464 return &ei->vfs_inode;
465 }
466
467 static void ext3_destroy_inode(struct inode *inode)
468 {
469 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
470 printk("EXT3 Inode %p: orphan list check failed!\n",
471 EXT3_I(inode));
472 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
473 EXT3_I(inode), sizeof(struct ext3_inode_info),
474 false);
475 dump_stack();
476 }
477 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
478 }
479
480 static void init_once(void *foo)
481 {
482 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
483
484 INIT_LIST_HEAD(&ei->i_orphan);
485 #ifdef CONFIG_EXT3_FS_XATTR
486 init_rwsem(&ei->xattr_sem);
487 #endif
488 mutex_init(&ei->truncate_mutex);
489 inode_init_once(&ei->vfs_inode);
490 }
491
492 static int init_inodecache(void)
493 {
494 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
495 sizeof(struct ext3_inode_info),
496 0, (SLAB_RECLAIM_ACCOUNT|
497 SLAB_MEM_SPREAD),
498 init_once);
499 if (ext3_inode_cachep == NULL)
500 return -ENOMEM;
501 return 0;
502 }
503
504 static void destroy_inodecache(void)
505 {
506 kmem_cache_destroy(ext3_inode_cachep);
507 }
508
509 static void ext3_clear_inode(struct inode *inode)
510 {
511 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
512 #ifdef CONFIG_EXT3_FS_POSIX_ACL
513 if (EXT3_I(inode)->i_acl &&
514 EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
515 posix_acl_release(EXT3_I(inode)->i_acl);
516 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
517 }
518 if (EXT3_I(inode)->i_default_acl &&
519 EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
520 posix_acl_release(EXT3_I(inode)->i_default_acl);
521 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
522 }
523 #endif
524 ext3_discard_reservation(inode);
525 EXT3_I(inode)->i_block_alloc_info = NULL;
526 if (unlikely(rsv))
527 kfree(rsv);
528 }
529
530 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
531 {
532 #if defined(CONFIG_QUOTA)
533 struct ext3_sb_info *sbi = EXT3_SB(sb);
534
535 if (sbi->s_jquota_fmt)
536 seq_printf(seq, ",jqfmt=%s",
537 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
538
539 if (sbi->s_qf_names[USRQUOTA])
540 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
541
542 if (sbi->s_qf_names[GRPQUOTA])
543 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
544
545 if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
546 seq_puts(seq, ",usrquota");
547
548 if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
549 seq_puts(seq, ",grpquota");
550 #endif
551 }
552
553 /*
554 * Show an option if
555 * - it's set to a non-default value OR
556 * - if the per-sb default is different from the global default
557 */
558 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
559 {
560 struct super_block *sb = vfs->mnt_sb;
561 struct ext3_sb_info *sbi = EXT3_SB(sb);
562 struct ext3_super_block *es = sbi->s_es;
563 unsigned long def_mount_opts;
564
565 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
566
567 if (sbi->s_sb_block != 1)
568 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
569 if (test_opt(sb, MINIX_DF))
570 seq_puts(seq, ",minixdf");
571 if (test_opt(sb, GRPID))
572 seq_puts(seq, ",grpid");
573 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
574 seq_puts(seq, ",nogrpid");
575 if (sbi->s_resuid != EXT3_DEF_RESUID ||
576 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
577 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
578 }
579 if (sbi->s_resgid != EXT3_DEF_RESGID ||
580 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
581 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
582 }
583 if (test_opt(sb, ERRORS_RO)) {
584 int def_errors = le16_to_cpu(es->s_errors);
585
586 if (def_errors == EXT3_ERRORS_PANIC ||
587 def_errors == EXT3_ERRORS_CONTINUE) {
588 seq_puts(seq, ",errors=remount-ro");
589 }
590 }
591 if (test_opt(sb, ERRORS_CONT))
592 seq_puts(seq, ",errors=continue");
593 if (test_opt(sb, ERRORS_PANIC))
594 seq_puts(seq, ",errors=panic");
595 if (test_opt(sb, NO_UID32))
596 seq_puts(seq, ",nouid32");
597 if (test_opt(sb, DEBUG))
598 seq_puts(seq, ",debug");
599 if (test_opt(sb, OLDALLOC))
600 seq_puts(seq, ",oldalloc");
601 #ifdef CONFIG_EXT3_FS_XATTR
602 if (test_opt(sb, XATTR_USER))
603 seq_puts(seq, ",user_xattr");
604 if (!test_opt(sb, XATTR_USER) &&
605 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
606 seq_puts(seq, ",nouser_xattr");
607 }
608 #endif
609 #ifdef CONFIG_EXT3_FS_POSIX_ACL
610 if (test_opt(sb, POSIX_ACL))
611 seq_puts(seq, ",acl");
612 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
613 seq_puts(seq, ",noacl");
614 #endif
615 if (!test_opt(sb, RESERVATION))
616 seq_puts(seq, ",noreservation");
617 if (sbi->s_commit_interval) {
618 seq_printf(seq, ",commit=%u",
619 (unsigned) (sbi->s_commit_interval / HZ));
620 }
621 if (test_opt(sb, BARRIER))
622 seq_puts(seq, ",barrier=1");
623 if (test_opt(sb, NOBH))
624 seq_puts(seq, ",nobh");
625
626 if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
627 seq_puts(seq, ",data=journal");
628 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
629 seq_puts(seq, ",data=ordered");
630 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
631 seq_puts(seq, ",data=writeback");
632
633 if (test_opt(sb, DATA_ERR_ABORT))
634 seq_puts(seq, ",data_err=abort");
635
636 ext3_show_quota_options(seq, sb);
637
638 return 0;
639 }
640
641
642 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
643 u64 ino, u32 generation)
644 {
645 struct inode *inode;
646
647 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
648 return ERR_PTR(-ESTALE);
649 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
650 return ERR_PTR(-ESTALE);
651
652 /* iget isn't really right if the inode is currently unallocated!!
653 *
654 * ext3_read_inode will return a bad_inode if the inode had been
655 * deleted, so we should be safe.
656 *
657 * Currently we don't know the generation for parent directory, so
658 * a generation of 0 means "accept any"
659 */
660 inode = ext3_iget(sb, ino);
661 if (IS_ERR(inode))
662 return ERR_CAST(inode);
663 if (generation && inode->i_generation != generation) {
664 iput(inode);
665 return ERR_PTR(-ESTALE);
666 }
667
668 return inode;
669 }
670
671 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
672 int fh_len, int fh_type)
673 {
674 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
675 ext3_nfs_get_inode);
676 }
677
678 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
679 int fh_len, int fh_type)
680 {
681 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
682 ext3_nfs_get_inode);
683 }
684
685 /*
686 * Try to release metadata pages (indirect blocks, directories) which are
687 * mapped via the block device. Since these pages could have journal heads
688 * which would prevent try_to_free_buffers() from freeing them, we must use
689 * jbd layer's try_to_free_buffers() function to release them.
690 */
691 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
692 gfp_t wait)
693 {
694 journal_t *journal = EXT3_SB(sb)->s_journal;
695
696 WARN_ON(PageChecked(page));
697 if (!page_has_buffers(page))
698 return 0;
699 if (journal)
700 return journal_try_to_free_buffers(journal, page,
701 wait & ~__GFP_WAIT);
702 return try_to_free_buffers(page);
703 }
704
705 #ifdef CONFIG_QUOTA
706 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
707 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
708
709 static int ext3_dquot_initialize(struct inode *inode, int type);
710 static int ext3_dquot_drop(struct inode *inode);
711 static int ext3_write_dquot(struct dquot *dquot);
712 static int ext3_acquire_dquot(struct dquot *dquot);
713 static int ext3_release_dquot(struct dquot *dquot);
714 static int ext3_mark_dquot_dirty(struct dquot *dquot);
715 static int ext3_write_info(struct super_block *sb, int type);
716 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
717 char *path, int remount);
718 static int ext3_quota_on_mount(struct super_block *sb, int type);
719 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
720 size_t len, loff_t off);
721 static ssize_t ext3_quota_write(struct super_block *sb, int type,
722 const char *data, size_t len, loff_t off);
723
724 static struct dquot_operations ext3_quota_operations = {
725 .initialize = ext3_dquot_initialize,
726 .drop = ext3_dquot_drop,
727 .alloc_space = dquot_alloc_space,
728 .alloc_inode = dquot_alloc_inode,
729 .free_space = dquot_free_space,
730 .free_inode = dquot_free_inode,
731 .transfer = dquot_transfer,
732 .write_dquot = ext3_write_dquot,
733 .acquire_dquot = ext3_acquire_dquot,
734 .release_dquot = ext3_release_dquot,
735 .mark_dirty = ext3_mark_dquot_dirty,
736 .write_info = ext3_write_info
737 };
738
739 static struct quotactl_ops ext3_qctl_operations = {
740 .quota_on = ext3_quota_on,
741 .quota_off = vfs_quota_off,
742 .quota_sync = vfs_quota_sync,
743 .get_info = vfs_get_dqinfo,
744 .set_info = vfs_set_dqinfo,
745 .get_dqblk = vfs_get_dqblk,
746 .set_dqblk = vfs_set_dqblk
747 };
748 #endif
749
750 static const struct super_operations ext3_sops = {
751 .alloc_inode = ext3_alloc_inode,
752 .destroy_inode = ext3_destroy_inode,
753 .write_inode = ext3_write_inode,
754 .dirty_inode = ext3_dirty_inode,
755 .delete_inode = ext3_delete_inode,
756 .put_super = ext3_put_super,
757 .write_super = ext3_write_super,
758 .sync_fs = ext3_sync_fs,
759 .write_super_lockfs = ext3_write_super_lockfs,
760 .unlockfs = ext3_unlockfs,
761 .statfs = ext3_statfs,
762 .remount_fs = ext3_remount,
763 .clear_inode = ext3_clear_inode,
764 .show_options = ext3_show_options,
765 #ifdef CONFIG_QUOTA
766 .quota_read = ext3_quota_read,
767 .quota_write = ext3_quota_write,
768 #endif
769 .bdev_try_to_free_page = bdev_try_to_free_page,
770 };
771
772 static const struct export_operations ext3_export_ops = {
773 .fh_to_dentry = ext3_fh_to_dentry,
774 .fh_to_parent = ext3_fh_to_parent,
775 .get_parent = ext3_get_parent,
776 };
777
778 enum {
779 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
780 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
781 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
782 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
783 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
784 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
785 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
786 Opt_data_err_abort, Opt_data_err_ignore,
787 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
788 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
789 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
790 Opt_grpquota
791 };
792
793 static const match_table_t tokens = {
794 {Opt_bsd_df, "bsddf"},
795 {Opt_minix_df, "minixdf"},
796 {Opt_grpid, "grpid"},
797 {Opt_grpid, "bsdgroups"},
798 {Opt_nogrpid, "nogrpid"},
799 {Opt_nogrpid, "sysvgroups"},
800 {Opt_resgid, "resgid=%u"},
801 {Opt_resuid, "resuid=%u"},
802 {Opt_sb, "sb=%u"},
803 {Opt_err_cont, "errors=continue"},
804 {Opt_err_panic, "errors=panic"},
805 {Opt_err_ro, "errors=remount-ro"},
806 {Opt_nouid32, "nouid32"},
807 {Opt_nocheck, "nocheck"},
808 {Opt_nocheck, "check=none"},
809 {Opt_debug, "debug"},
810 {Opt_oldalloc, "oldalloc"},
811 {Opt_orlov, "orlov"},
812 {Opt_user_xattr, "user_xattr"},
813 {Opt_nouser_xattr, "nouser_xattr"},
814 {Opt_acl, "acl"},
815 {Opt_noacl, "noacl"},
816 {Opt_reservation, "reservation"},
817 {Opt_noreservation, "noreservation"},
818 {Opt_noload, "noload"},
819 {Opt_nobh, "nobh"},
820 {Opt_bh, "bh"},
821 {Opt_commit, "commit=%u"},
822 {Opt_journal_update, "journal=update"},
823 {Opt_journal_inum, "journal=%u"},
824 {Opt_journal_dev, "journal_dev=%u"},
825 {Opt_abort, "abort"},
826 {Opt_data_journal, "data=journal"},
827 {Opt_data_ordered, "data=ordered"},
828 {Opt_data_writeback, "data=writeback"},
829 {Opt_data_err_abort, "data_err=abort"},
830 {Opt_data_err_ignore, "data_err=ignore"},
831 {Opt_offusrjquota, "usrjquota="},
832 {Opt_usrjquota, "usrjquota=%s"},
833 {Opt_offgrpjquota, "grpjquota="},
834 {Opt_grpjquota, "grpjquota=%s"},
835 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
836 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
837 {Opt_grpquota, "grpquota"},
838 {Opt_noquota, "noquota"},
839 {Opt_quota, "quota"},
840 {Opt_usrquota, "usrquota"},
841 {Opt_barrier, "barrier=%u"},
842 {Opt_resize, "resize"},
843 {Opt_err, NULL},
844 };
845
846 static ext3_fsblk_t get_sb_block(void **data)
847 {
848 ext3_fsblk_t sb_block;
849 char *options = (char *) *data;
850
851 if (!options || strncmp(options, "sb=", 3) != 0)
852 return 1; /* Default location */
853 options += 3;
854 /*todo: use simple_strtoll with >32bit ext3 */
855 sb_block = simple_strtoul(options, &options, 0);
856 if (*options && *options != ',') {
857 printk("EXT3-fs: Invalid sb specification: %s\n",
858 (char *) *data);
859 return 1;
860 }
861 if (*options == ',')
862 options++;
863 *data = (void *) options;
864 return sb_block;
865 }
866
867 static int parse_options (char *options, struct super_block *sb,
868 unsigned int *inum, unsigned long *journal_devnum,
869 ext3_fsblk_t *n_blocks_count, int is_remount)
870 {
871 struct ext3_sb_info *sbi = EXT3_SB(sb);
872 char * p;
873 substring_t args[MAX_OPT_ARGS];
874 int data_opt = 0;
875 int option;
876 #ifdef CONFIG_QUOTA
877 int qtype, qfmt;
878 char *qname;
879 #endif
880
881 if (!options)
882 return 1;
883
884 while ((p = strsep (&options, ",")) != NULL) {
885 int token;
886 if (!*p)
887 continue;
888
889 token = match_token(p, tokens, args);
890 switch (token) {
891 case Opt_bsd_df:
892 clear_opt (sbi->s_mount_opt, MINIX_DF);
893 break;
894 case Opt_minix_df:
895 set_opt (sbi->s_mount_opt, MINIX_DF);
896 break;
897 case Opt_grpid:
898 set_opt (sbi->s_mount_opt, GRPID);
899 break;
900 case Opt_nogrpid:
901 clear_opt (sbi->s_mount_opt, GRPID);
902 break;
903 case Opt_resuid:
904 if (match_int(&args[0], &option))
905 return 0;
906 sbi->s_resuid = option;
907 break;
908 case Opt_resgid:
909 if (match_int(&args[0], &option))
910 return 0;
911 sbi->s_resgid = option;
912 break;
913 case Opt_sb:
914 /* handled by get_sb_block() instead of here */
915 /* *sb_block = match_int(&args[0]); */
916 break;
917 case Opt_err_panic:
918 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
919 clear_opt (sbi->s_mount_opt, ERRORS_RO);
920 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
921 break;
922 case Opt_err_ro:
923 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
924 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
925 set_opt (sbi->s_mount_opt, ERRORS_RO);
926 break;
927 case Opt_err_cont:
928 clear_opt (sbi->s_mount_opt, ERRORS_RO);
929 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
930 set_opt (sbi->s_mount_opt, ERRORS_CONT);
931 break;
932 case Opt_nouid32:
933 set_opt (sbi->s_mount_opt, NO_UID32);
934 break;
935 case Opt_nocheck:
936 clear_opt (sbi->s_mount_opt, CHECK);
937 break;
938 case Opt_debug:
939 set_opt (sbi->s_mount_opt, DEBUG);
940 break;
941 case Opt_oldalloc:
942 set_opt (sbi->s_mount_opt, OLDALLOC);
943 break;
944 case Opt_orlov:
945 clear_opt (sbi->s_mount_opt, OLDALLOC);
946 break;
947 #ifdef CONFIG_EXT3_FS_XATTR
948 case Opt_user_xattr:
949 set_opt (sbi->s_mount_opt, XATTR_USER);
950 break;
951 case Opt_nouser_xattr:
952 clear_opt (sbi->s_mount_opt, XATTR_USER);
953 break;
954 #else
955 case Opt_user_xattr:
956 case Opt_nouser_xattr:
957 printk("EXT3 (no)user_xattr options not supported\n");
958 break;
959 #endif
960 #ifdef CONFIG_EXT3_FS_POSIX_ACL
961 case Opt_acl:
962 set_opt(sbi->s_mount_opt, POSIX_ACL);
963 break;
964 case Opt_noacl:
965 clear_opt(sbi->s_mount_opt, POSIX_ACL);
966 break;
967 #else
968 case Opt_acl:
969 case Opt_noacl:
970 printk("EXT3 (no)acl options not supported\n");
971 break;
972 #endif
973 case Opt_reservation:
974 set_opt(sbi->s_mount_opt, RESERVATION);
975 break;
976 case Opt_noreservation:
977 clear_opt(sbi->s_mount_opt, RESERVATION);
978 break;
979 case Opt_journal_update:
980 /* @@@ FIXME */
981 /* Eventually we will want to be able to create
982 a journal file here. For now, only allow the
983 user to specify an existing inode to be the
984 journal file. */
985 if (is_remount) {
986 printk(KERN_ERR "EXT3-fs: cannot specify "
987 "journal on remount\n");
988 return 0;
989 }
990 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
991 break;
992 case Opt_journal_inum:
993 if (is_remount) {
994 printk(KERN_ERR "EXT3-fs: cannot specify "
995 "journal on remount\n");
996 return 0;
997 }
998 if (match_int(&args[0], &option))
999 return 0;
1000 *inum = option;
1001 break;
1002 case Opt_journal_dev:
1003 if (is_remount) {
1004 printk(KERN_ERR "EXT3-fs: cannot specify "
1005 "journal on remount\n");
1006 return 0;
1007 }
1008 if (match_int(&args[0], &option))
1009 return 0;
1010 *journal_devnum = option;
1011 break;
1012 case Opt_noload:
1013 set_opt (sbi->s_mount_opt, NOLOAD);
1014 break;
1015 case Opt_commit:
1016 if (match_int(&args[0], &option))
1017 return 0;
1018 if (option < 0)
1019 return 0;
1020 if (option == 0)
1021 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1022 sbi->s_commit_interval = HZ * option;
1023 break;
1024 case Opt_data_journal:
1025 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1026 goto datacheck;
1027 case Opt_data_ordered:
1028 data_opt = EXT3_MOUNT_ORDERED_DATA;
1029 goto datacheck;
1030 case Opt_data_writeback:
1031 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1032 datacheck:
1033 if (is_remount) {
1034 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
1035 != data_opt) {
1036 printk(KERN_ERR
1037 "EXT3-fs: cannot change data "
1038 "mode on remount\n");
1039 return 0;
1040 }
1041 } else {
1042 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
1043 sbi->s_mount_opt |= data_opt;
1044 }
1045 break;
1046 case Opt_data_err_abort:
1047 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1048 break;
1049 case Opt_data_err_ignore:
1050 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1051 break;
1052 #ifdef CONFIG_QUOTA
1053 case Opt_usrjquota:
1054 qtype = USRQUOTA;
1055 goto set_qf_name;
1056 case Opt_grpjquota:
1057 qtype = GRPQUOTA;
1058 set_qf_name:
1059 if ((sb_any_quota_enabled(sb) ||
1060 sb_any_quota_suspended(sb)) &&
1061 !sbi->s_qf_names[qtype]) {
1062 printk(KERN_ERR
1063 "EXT3-fs: Cannot change journaled "
1064 "quota options when quota turned on.\n");
1065 return 0;
1066 }
1067 qname = match_strdup(&args[0]);
1068 if (!qname) {
1069 printk(KERN_ERR
1070 "EXT3-fs: not enough memory for "
1071 "storing quotafile name.\n");
1072 return 0;
1073 }
1074 if (sbi->s_qf_names[qtype] &&
1075 strcmp(sbi->s_qf_names[qtype], qname)) {
1076 printk(KERN_ERR
1077 "EXT3-fs: %s quota file already "
1078 "specified.\n", QTYPE2NAME(qtype));
1079 kfree(qname);
1080 return 0;
1081 }
1082 sbi->s_qf_names[qtype] = qname;
1083 if (strchr(sbi->s_qf_names[qtype], '/')) {
1084 printk(KERN_ERR
1085 "EXT3-fs: quotafile must be on "
1086 "filesystem root.\n");
1087 kfree(sbi->s_qf_names[qtype]);
1088 sbi->s_qf_names[qtype] = NULL;
1089 return 0;
1090 }
1091 set_opt(sbi->s_mount_opt, QUOTA);
1092 break;
1093 case Opt_offusrjquota:
1094 qtype = USRQUOTA;
1095 goto clear_qf_name;
1096 case Opt_offgrpjquota:
1097 qtype = GRPQUOTA;
1098 clear_qf_name:
1099 if ((sb_any_quota_enabled(sb) ||
1100 sb_any_quota_suspended(sb)) &&
1101 sbi->s_qf_names[qtype]) {
1102 printk(KERN_ERR "EXT3-fs: Cannot change "
1103 "journaled quota options when "
1104 "quota turned on.\n");
1105 return 0;
1106 }
1107 /*
1108 * The space will be released later when all options
1109 * are confirmed to be correct
1110 */
1111 sbi->s_qf_names[qtype] = NULL;
1112 break;
1113 case Opt_jqfmt_vfsold:
1114 qfmt = QFMT_VFS_OLD;
1115 goto set_qf_format;
1116 case Opt_jqfmt_vfsv0:
1117 qfmt = QFMT_VFS_V0;
1118 set_qf_format:
1119 if ((sb_any_quota_enabled(sb) ||
1120 sb_any_quota_suspended(sb)) &&
1121 sbi->s_jquota_fmt != qfmt) {
1122 printk(KERN_ERR "EXT3-fs: Cannot change "
1123 "journaled quota options when "
1124 "quota turned on.\n");
1125 return 0;
1126 }
1127 sbi->s_jquota_fmt = qfmt;
1128 break;
1129 case Opt_quota:
1130 case Opt_usrquota:
1131 set_opt(sbi->s_mount_opt, QUOTA);
1132 set_opt(sbi->s_mount_opt, USRQUOTA);
1133 break;
1134 case Opt_grpquota:
1135 set_opt(sbi->s_mount_opt, QUOTA);
1136 set_opt(sbi->s_mount_opt, GRPQUOTA);
1137 break;
1138 case Opt_noquota:
1139 if (sb_any_quota_enabled(sb) ||
1140 sb_any_quota_suspended(sb)) {
1141 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1142 "options when quota turned on.\n");
1143 return 0;
1144 }
1145 clear_opt(sbi->s_mount_opt, QUOTA);
1146 clear_opt(sbi->s_mount_opt, USRQUOTA);
1147 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1148 break;
1149 #else
1150 case Opt_quota:
1151 case Opt_usrquota:
1152 case Opt_grpquota:
1153 printk(KERN_ERR
1154 "EXT3-fs: quota options not supported.\n");
1155 break;
1156 case Opt_usrjquota:
1157 case Opt_grpjquota:
1158 case Opt_offusrjquota:
1159 case Opt_offgrpjquota:
1160 case Opt_jqfmt_vfsold:
1161 case Opt_jqfmt_vfsv0:
1162 printk(KERN_ERR
1163 "EXT3-fs: journaled quota options not "
1164 "supported.\n");
1165 break;
1166 case Opt_noquota:
1167 break;
1168 #endif
1169 case Opt_abort:
1170 set_opt(sbi->s_mount_opt, ABORT);
1171 break;
1172 case Opt_barrier:
1173 if (match_int(&args[0], &option))
1174 return 0;
1175 if (option)
1176 set_opt(sbi->s_mount_opt, BARRIER);
1177 else
1178 clear_opt(sbi->s_mount_opt, BARRIER);
1179 break;
1180 case Opt_ignore:
1181 break;
1182 case Opt_resize:
1183 if (!is_remount) {
1184 printk("EXT3-fs: resize option only available "
1185 "for remount\n");
1186 return 0;
1187 }
1188 if (match_int(&args[0], &option) != 0)
1189 return 0;
1190 *n_blocks_count = option;
1191 break;
1192 case Opt_nobh:
1193 set_opt(sbi->s_mount_opt, NOBH);
1194 break;
1195 case Opt_bh:
1196 clear_opt(sbi->s_mount_opt, NOBH);
1197 break;
1198 default:
1199 printk (KERN_ERR
1200 "EXT3-fs: Unrecognized mount option \"%s\" "
1201 "or missing value\n", p);
1202 return 0;
1203 }
1204 }
1205 #ifdef CONFIG_QUOTA
1206 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1207 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1208 sbi->s_qf_names[USRQUOTA])
1209 clear_opt(sbi->s_mount_opt, USRQUOTA);
1210
1211 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1212 sbi->s_qf_names[GRPQUOTA])
1213 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1214
1215 if ((sbi->s_qf_names[USRQUOTA] &&
1216 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1217 (sbi->s_qf_names[GRPQUOTA] &&
1218 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1219 printk(KERN_ERR "EXT3-fs: old and new quota "
1220 "format mixing.\n");
1221 return 0;
1222 }
1223
1224 if (!sbi->s_jquota_fmt) {
1225 printk(KERN_ERR "EXT3-fs: journaled quota format "
1226 "not specified.\n");
1227 return 0;
1228 }
1229 } else {
1230 if (sbi->s_jquota_fmt) {
1231 printk(KERN_ERR "EXT3-fs: journaled quota format "
1232 "specified with no journaling "
1233 "enabled.\n");
1234 return 0;
1235 }
1236 }
1237 #endif
1238 return 1;
1239 }
1240
1241 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1242 int read_only)
1243 {
1244 struct ext3_sb_info *sbi = EXT3_SB(sb);
1245 int res = 0;
1246
1247 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1248 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1249 "forcing read-only mode\n");
1250 res = MS_RDONLY;
1251 }
1252 if (read_only)
1253 return res;
1254 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1255 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1256 "running e2fsck is recommended\n");
1257 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1258 printk (KERN_WARNING
1259 "EXT3-fs warning: mounting fs with errors, "
1260 "running e2fsck is recommended\n");
1261 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1262 le16_to_cpu(es->s_mnt_count) >=
1263 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1264 printk (KERN_WARNING
1265 "EXT3-fs warning: maximal mount count reached, "
1266 "running e2fsck is recommended\n");
1267 else if (le32_to_cpu(es->s_checkinterval) &&
1268 (le32_to_cpu(es->s_lastcheck) +
1269 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1270 printk (KERN_WARNING
1271 "EXT3-fs warning: checktime reached, "
1272 "running e2fsck is recommended\n");
1273 #if 0
1274 /* @@@ We _will_ want to clear the valid bit if we find
1275 inconsistencies, to force a fsck at reboot. But for
1276 a plain journaled filesystem we can keep it set as
1277 valid forever! :) */
1278 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1279 #endif
1280 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1281 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1282 le16_add_cpu(&es->s_mnt_count, 1);
1283 es->s_mtime = cpu_to_le32(get_seconds());
1284 ext3_update_dynamic_rev(sb);
1285 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1286
1287 ext3_commit_super(sb, es, 1);
1288 if (test_opt(sb, DEBUG))
1289 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1290 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1291 sb->s_blocksize,
1292 sbi->s_groups_count,
1293 EXT3_BLOCKS_PER_GROUP(sb),
1294 EXT3_INODES_PER_GROUP(sb),
1295 sbi->s_mount_opt);
1296
1297 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1298 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1299 char b[BDEVNAME_SIZE];
1300
1301 printk("external journal on %s\n",
1302 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1303 } else {
1304 printk("internal journal\n");
1305 }
1306 return res;
1307 }
1308
1309 /* Called at mount-time, super-block is locked */
1310 static int ext3_check_descriptors(struct super_block *sb)
1311 {
1312 struct ext3_sb_info *sbi = EXT3_SB(sb);
1313 int i;
1314
1315 ext3_debug ("Checking group descriptors");
1316
1317 for (i = 0; i < sbi->s_groups_count; i++) {
1318 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1319 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1320 ext3_fsblk_t last_block;
1321
1322 if (i == sbi->s_groups_count - 1)
1323 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1324 else
1325 last_block = first_block +
1326 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1327
1328 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1329 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1330 {
1331 ext3_error (sb, "ext3_check_descriptors",
1332 "Block bitmap for group %d"
1333 " not in group (block %lu)!",
1334 i, (unsigned long)
1335 le32_to_cpu(gdp->bg_block_bitmap));
1336 return 0;
1337 }
1338 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1339 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1340 {
1341 ext3_error (sb, "ext3_check_descriptors",
1342 "Inode bitmap for group %d"
1343 " not in group (block %lu)!",
1344 i, (unsigned long)
1345 le32_to_cpu(gdp->bg_inode_bitmap));
1346 return 0;
1347 }
1348 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1349 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1350 last_block)
1351 {
1352 ext3_error (sb, "ext3_check_descriptors",
1353 "Inode table for group %d"
1354 " not in group (block %lu)!",
1355 i, (unsigned long)
1356 le32_to_cpu(gdp->bg_inode_table));
1357 return 0;
1358 }
1359 }
1360
1361 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1362 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1363 return 1;
1364 }
1365
1366
1367 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1368 * the superblock) which were deleted from all directories, but held open by
1369 * a process at the time of a crash. We walk the list and try to delete these
1370 * inodes at recovery time (only with a read-write filesystem).
1371 *
1372 * In order to keep the orphan inode chain consistent during traversal (in
1373 * case of crash during recovery), we link each inode into the superblock
1374 * orphan list_head and handle it the same way as an inode deletion during
1375 * normal operation (which journals the operations for us).
1376 *
1377 * We only do an iget() and an iput() on each inode, which is very safe if we
1378 * accidentally point at an in-use or already deleted inode. The worst that
1379 * can happen in this case is that we get a "bit already cleared" message from
1380 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1381 * e2fsck was run on this filesystem, and it must have already done the orphan
1382 * inode cleanup for us, so we can safely abort without any further action.
1383 */
1384 static void ext3_orphan_cleanup (struct super_block * sb,
1385 struct ext3_super_block * es)
1386 {
1387 unsigned int s_flags = sb->s_flags;
1388 int nr_orphans = 0, nr_truncates = 0;
1389 #ifdef CONFIG_QUOTA
1390 int i;
1391 #endif
1392 if (!es->s_last_orphan) {
1393 jbd_debug(4, "no orphan inodes to clean up\n");
1394 return;
1395 }
1396
1397 if (bdev_read_only(sb->s_bdev)) {
1398 printk(KERN_ERR "EXT3-fs: write access "
1399 "unavailable, skipping orphan cleanup.\n");
1400 return;
1401 }
1402
1403 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1404 if (es->s_last_orphan)
1405 jbd_debug(1, "Errors on filesystem, "
1406 "clearing orphan list.\n");
1407 es->s_last_orphan = 0;
1408 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1409 return;
1410 }
1411
1412 if (s_flags & MS_RDONLY) {
1413 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1414 sb->s_id);
1415 sb->s_flags &= ~MS_RDONLY;
1416 }
1417 #ifdef CONFIG_QUOTA
1418 /* Needed for iput() to work correctly and not trash data */
1419 sb->s_flags |= MS_ACTIVE;
1420 /* Turn on quotas so that they are updated correctly */
1421 for (i = 0; i < MAXQUOTAS; i++) {
1422 if (EXT3_SB(sb)->s_qf_names[i]) {
1423 int ret = ext3_quota_on_mount(sb, i);
1424 if (ret < 0)
1425 printk(KERN_ERR
1426 "EXT3-fs: Cannot turn on journaled "
1427 "quota: error %d\n", ret);
1428 }
1429 }
1430 #endif
1431
1432 while (es->s_last_orphan) {
1433 struct inode *inode;
1434
1435 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1436 if (IS_ERR(inode)) {
1437 es->s_last_orphan = 0;
1438 break;
1439 }
1440
1441 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1442 DQUOT_INIT(inode);
1443 if (inode->i_nlink) {
1444 printk(KERN_DEBUG
1445 "%s: truncating inode %lu to %Ld bytes\n",
1446 __func__, inode->i_ino, inode->i_size);
1447 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1448 inode->i_ino, inode->i_size);
1449 ext3_truncate(inode);
1450 nr_truncates++;
1451 } else {
1452 printk(KERN_DEBUG
1453 "%s: deleting unreferenced inode %lu\n",
1454 __func__, inode->i_ino);
1455 jbd_debug(2, "deleting unreferenced inode %lu\n",
1456 inode->i_ino);
1457 nr_orphans++;
1458 }
1459 iput(inode); /* The delete magic happens here! */
1460 }
1461
1462 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1463
1464 if (nr_orphans)
1465 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1466 sb->s_id, PLURAL(nr_orphans));
1467 if (nr_truncates)
1468 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1469 sb->s_id, PLURAL(nr_truncates));
1470 #ifdef CONFIG_QUOTA
1471 /* Turn quotas off */
1472 for (i = 0; i < MAXQUOTAS; i++) {
1473 if (sb_dqopt(sb)->files[i])
1474 vfs_quota_off(sb, i, 0);
1475 }
1476 #endif
1477 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1478 }
1479
1480 /*
1481 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1482 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1483 * We need to be 1 filesystem block less than the 2^32 sector limit.
1484 */
1485 static loff_t ext3_max_size(int bits)
1486 {
1487 loff_t res = EXT3_NDIR_BLOCKS;
1488 int meta_blocks;
1489 loff_t upper_limit;
1490
1491 /* This is calculated to be the largest file size for a
1492 * dense, file such that the total number of
1493 * sectors in the file, including data and all indirect blocks,
1494 * does not exceed 2^32 -1
1495 * __u32 i_blocks representing the total number of
1496 * 512 bytes blocks of the file
1497 */
1498 upper_limit = (1LL << 32) - 1;
1499
1500 /* total blocks in file system block size */
1501 upper_limit >>= (bits - 9);
1502
1503
1504 /* indirect blocks */
1505 meta_blocks = 1;
1506 /* double indirect blocks */
1507 meta_blocks += 1 + (1LL << (bits-2));
1508 /* tripple indirect blocks */
1509 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1510
1511 upper_limit -= meta_blocks;
1512 upper_limit <<= bits;
1513
1514 res += 1LL << (bits-2);
1515 res += 1LL << (2*(bits-2));
1516 res += 1LL << (3*(bits-2));
1517 res <<= bits;
1518 if (res > upper_limit)
1519 res = upper_limit;
1520
1521 if (res > MAX_LFS_FILESIZE)
1522 res = MAX_LFS_FILESIZE;
1523
1524 return res;
1525 }
1526
1527 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1528 ext3_fsblk_t logic_sb_block,
1529 int nr)
1530 {
1531 struct ext3_sb_info *sbi = EXT3_SB(sb);
1532 unsigned long bg, first_meta_bg;
1533 int has_super = 0;
1534
1535 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1536
1537 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1538 nr < first_meta_bg)
1539 return (logic_sb_block + nr + 1);
1540 bg = sbi->s_desc_per_block * nr;
1541 if (ext3_bg_has_super(sb, bg))
1542 has_super = 1;
1543 return (has_super + ext3_group_first_block_no(sb, bg));
1544 }
1545
1546
1547 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1548 {
1549 struct buffer_head * bh;
1550 struct ext3_super_block *es = NULL;
1551 struct ext3_sb_info *sbi;
1552 ext3_fsblk_t block;
1553 ext3_fsblk_t sb_block = get_sb_block(&data);
1554 ext3_fsblk_t logic_sb_block;
1555 unsigned long offset = 0;
1556 unsigned int journal_inum = 0;
1557 unsigned long journal_devnum = 0;
1558 unsigned long def_mount_opts;
1559 struct inode *root;
1560 int blocksize;
1561 int hblock;
1562 int db_count;
1563 int i;
1564 int needs_recovery;
1565 int ret = -EINVAL;
1566 __le32 features;
1567 int err;
1568
1569 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1570 if (!sbi)
1571 return -ENOMEM;
1572 sb->s_fs_info = sbi;
1573 sbi->s_mount_opt = 0;
1574 sbi->s_resuid = EXT3_DEF_RESUID;
1575 sbi->s_resgid = EXT3_DEF_RESGID;
1576 sbi->s_sb_block = sb_block;
1577
1578 unlock_kernel();
1579
1580 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1581 if (!blocksize) {
1582 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1583 goto out_fail;
1584 }
1585
1586 /*
1587 * The ext3 superblock will not be buffer aligned for other than 1kB
1588 * block sizes. We need to calculate the offset from buffer start.
1589 */
1590 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1591 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1592 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1593 } else {
1594 logic_sb_block = sb_block;
1595 }
1596
1597 if (!(bh = sb_bread(sb, logic_sb_block))) {
1598 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1599 goto out_fail;
1600 }
1601 /*
1602 * Note: s_es must be initialized as soon as possible because
1603 * some ext3 macro-instructions depend on its value
1604 */
1605 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1606 sbi->s_es = es;
1607 sb->s_magic = le16_to_cpu(es->s_magic);
1608 if (sb->s_magic != EXT3_SUPER_MAGIC)
1609 goto cantfind_ext3;
1610
1611 /* Set defaults before we parse the mount options */
1612 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1613 if (def_mount_opts & EXT3_DEFM_DEBUG)
1614 set_opt(sbi->s_mount_opt, DEBUG);
1615 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1616 set_opt(sbi->s_mount_opt, GRPID);
1617 if (def_mount_opts & EXT3_DEFM_UID16)
1618 set_opt(sbi->s_mount_opt, NO_UID32);
1619 #ifdef CONFIG_EXT3_FS_XATTR
1620 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1621 set_opt(sbi->s_mount_opt, XATTR_USER);
1622 #endif
1623 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1624 if (def_mount_opts & EXT3_DEFM_ACL)
1625 set_opt(sbi->s_mount_opt, POSIX_ACL);
1626 #endif
1627 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1628 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1629 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1630 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1631 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1632 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1633
1634 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1635 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1636 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1637 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1638 else
1639 set_opt(sbi->s_mount_opt, ERRORS_RO);
1640
1641 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1642 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1643
1644 set_opt(sbi->s_mount_opt, RESERVATION);
1645
1646 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1647 NULL, 0))
1648 goto failed_mount;
1649
1650 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1651 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1652
1653 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1654 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1655 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1656 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1657 printk(KERN_WARNING
1658 "EXT3-fs warning: feature flags set on rev 0 fs, "
1659 "running e2fsck is recommended\n");
1660 /*
1661 * Check feature flags regardless of the revision level, since we
1662 * previously didn't change the revision level when setting the flags,
1663 * so there is a chance incompat flags are set on a rev 0 filesystem.
1664 */
1665 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1666 if (features) {
1667 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1668 "unsupported optional features (%x).\n",
1669 sb->s_id, le32_to_cpu(features));
1670 goto failed_mount;
1671 }
1672 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1673 if (!(sb->s_flags & MS_RDONLY) && features) {
1674 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1675 "unsupported optional features (%x).\n",
1676 sb->s_id, le32_to_cpu(features));
1677 goto failed_mount;
1678 }
1679 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1680
1681 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1682 blocksize > EXT3_MAX_BLOCK_SIZE) {
1683 printk(KERN_ERR
1684 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1685 blocksize, sb->s_id);
1686 goto failed_mount;
1687 }
1688
1689 hblock = bdev_hardsect_size(sb->s_bdev);
1690 if (sb->s_blocksize != blocksize) {
1691 /*
1692 * Make sure the blocksize for the filesystem is larger
1693 * than the hardware sectorsize for the machine.
1694 */
1695 if (blocksize < hblock) {
1696 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1697 "device blocksize %d.\n", blocksize, hblock);
1698 goto failed_mount;
1699 }
1700
1701 brelse (bh);
1702 if (!sb_set_blocksize(sb, blocksize)) {
1703 printk(KERN_ERR "EXT3-fs: bad blocksize %d.\n",
1704 blocksize);
1705 goto out_fail;
1706 }
1707 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1708 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1709 bh = sb_bread(sb, logic_sb_block);
1710 if (!bh) {
1711 printk(KERN_ERR
1712 "EXT3-fs: Can't read superblock on 2nd try.\n");
1713 goto failed_mount;
1714 }
1715 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1716 sbi->s_es = es;
1717 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1718 printk (KERN_ERR
1719 "EXT3-fs: Magic mismatch, very weird !\n");
1720 goto failed_mount;
1721 }
1722 }
1723
1724 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1725
1726 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1727 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1728 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1729 } else {
1730 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1731 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1732 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1733 (!is_power_of_2(sbi->s_inode_size)) ||
1734 (sbi->s_inode_size > blocksize)) {
1735 printk (KERN_ERR
1736 "EXT3-fs: unsupported inode size: %d\n",
1737 sbi->s_inode_size);
1738 goto failed_mount;
1739 }
1740 }
1741 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1742 le32_to_cpu(es->s_log_frag_size);
1743 if (blocksize != sbi->s_frag_size) {
1744 printk(KERN_ERR
1745 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1746 sbi->s_frag_size, blocksize);
1747 goto failed_mount;
1748 }
1749 sbi->s_frags_per_block = 1;
1750 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1751 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1752 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1753 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1754 goto cantfind_ext3;
1755 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1756 if (sbi->s_inodes_per_block == 0)
1757 goto cantfind_ext3;
1758 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1759 sbi->s_inodes_per_block;
1760 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1761 sbi->s_sbh = bh;
1762 sbi->s_mount_state = le16_to_cpu(es->s_state);
1763 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1764 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1765 for (i=0; i < 4; i++)
1766 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1767 sbi->s_def_hash_version = es->s_def_hash_version;
1768 i = le32_to_cpu(es->s_flags);
1769 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1770 sbi->s_hash_unsigned = 3;
1771 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1772 #ifdef __CHAR_UNSIGNED__
1773 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1774 sbi->s_hash_unsigned = 3;
1775 #else
1776 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1777 #endif
1778 sb->s_dirt = 1;
1779 }
1780
1781 if (sbi->s_blocks_per_group > blocksize * 8) {
1782 printk (KERN_ERR
1783 "EXT3-fs: #blocks per group too big: %lu\n",
1784 sbi->s_blocks_per_group);
1785 goto failed_mount;
1786 }
1787 if (sbi->s_frags_per_group > blocksize * 8) {
1788 printk (KERN_ERR
1789 "EXT3-fs: #fragments per group too big: %lu\n",
1790 sbi->s_frags_per_group);
1791 goto failed_mount;
1792 }
1793 if (sbi->s_inodes_per_group > blocksize * 8) {
1794 printk (KERN_ERR
1795 "EXT3-fs: #inodes per group too big: %lu\n",
1796 sbi->s_inodes_per_group);
1797 goto failed_mount;
1798 }
1799
1800 if (le32_to_cpu(es->s_blocks_count) >
1801 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1802 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1803 " too large to mount safely\n", sb->s_id);
1804 if (sizeof(sector_t) < 8)
1805 printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1806 "enabled\n");
1807 goto failed_mount;
1808 }
1809
1810 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1811 goto cantfind_ext3;
1812 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1813 le32_to_cpu(es->s_first_data_block) - 1)
1814 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1815 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1816 EXT3_DESC_PER_BLOCK(sb);
1817 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1818 GFP_KERNEL);
1819 if (sbi->s_group_desc == NULL) {
1820 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1821 goto failed_mount;
1822 }
1823
1824 bgl_lock_init(&sbi->s_blockgroup_lock);
1825
1826 for (i = 0; i < db_count; i++) {
1827 block = descriptor_loc(sb, logic_sb_block, i);
1828 sbi->s_group_desc[i] = sb_bread(sb, block);
1829 if (!sbi->s_group_desc[i]) {
1830 printk (KERN_ERR "EXT3-fs: "
1831 "can't read group descriptor %d\n", i);
1832 db_count = i;
1833 goto failed_mount2;
1834 }
1835 }
1836 if (!ext3_check_descriptors (sb)) {
1837 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1838 goto failed_mount2;
1839 }
1840 sbi->s_gdb_count = db_count;
1841 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1842 spin_lock_init(&sbi->s_next_gen_lock);
1843
1844 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1845 ext3_count_free_blocks(sb));
1846 if (!err) {
1847 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1848 ext3_count_free_inodes(sb));
1849 }
1850 if (!err) {
1851 err = percpu_counter_init(&sbi->s_dirs_counter,
1852 ext3_count_dirs(sb));
1853 }
1854 if (err) {
1855 printk(KERN_ERR "EXT3-fs: insufficient memory\n");
1856 goto failed_mount3;
1857 }
1858
1859 /* per fileystem reservation list head & lock */
1860 spin_lock_init(&sbi->s_rsv_window_lock);
1861 sbi->s_rsv_window_root = RB_ROOT;
1862 /* Add a single, static dummy reservation to the start of the
1863 * reservation window list --- it gives us a placeholder for
1864 * append-at-start-of-list which makes the allocation logic
1865 * _much_ simpler. */
1866 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1867 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1868 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1869 sbi->s_rsv_window_head.rsv_goal_size = 0;
1870 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1871
1872 /*
1873 * set up enough so that it can read an inode
1874 */
1875 sb->s_op = &ext3_sops;
1876 sb->s_export_op = &ext3_export_ops;
1877 sb->s_xattr = ext3_xattr_handlers;
1878 #ifdef CONFIG_QUOTA
1879 sb->s_qcop = &ext3_qctl_operations;
1880 sb->dq_op = &ext3_quota_operations;
1881 #endif
1882 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1883
1884 sb->s_root = NULL;
1885
1886 needs_recovery = (es->s_last_orphan != 0 ||
1887 EXT3_HAS_INCOMPAT_FEATURE(sb,
1888 EXT3_FEATURE_INCOMPAT_RECOVER));
1889
1890 /*
1891 * The first inode we look at is the journal inode. Don't try
1892 * root first: it may be modified in the journal!
1893 */
1894 if (!test_opt(sb, NOLOAD) &&
1895 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1896 if (ext3_load_journal(sb, es, journal_devnum))
1897 goto failed_mount3;
1898 } else if (journal_inum) {
1899 if (ext3_create_journal(sb, es, journal_inum))
1900 goto failed_mount3;
1901 } else {
1902 if (!silent)
1903 printk (KERN_ERR
1904 "ext3: No journal on filesystem on %s\n",
1905 sb->s_id);
1906 goto failed_mount3;
1907 }
1908
1909 /* We have now updated the journal if required, so we can
1910 * validate the data journaling mode. */
1911 switch (test_opt(sb, DATA_FLAGS)) {
1912 case 0:
1913 /* No mode set, assume a default based on the journal
1914 capabilities: ORDERED_DATA if the journal can
1915 cope, else JOURNAL_DATA */
1916 if (journal_check_available_features
1917 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1918 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1919 else
1920 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1921 break;
1922
1923 case EXT3_MOUNT_ORDERED_DATA:
1924 case EXT3_MOUNT_WRITEBACK_DATA:
1925 if (!journal_check_available_features
1926 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1927 printk(KERN_ERR "EXT3-fs: Journal does not support "
1928 "requested data journaling mode\n");
1929 goto failed_mount4;
1930 }
1931 default:
1932 break;
1933 }
1934
1935 if (test_opt(sb, NOBH)) {
1936 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1937 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1938 "its supported only with writeback mode\n");
1939 clear_opt(sbi->s_mount_opt, NOBH);
1940 }
1941 }
1942 /*
1943 * The journal_load will have done any necessary log recovery,
1944 * so we can safely mount the rest of the filesystem now.
1945 */
1946
1947 root = ext3_iget(sb, EXT3_ROOT_INO);
1948 if (IS_ERR(root)) {
1949 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1950 ret = PTR_ERR(root);
1951 goto failed_mount4;
1952 }
1953 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1954 iput(root);
1955 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1956 goto failed_mount4;
1957 }
1958 sb->s_root = d_alloc_root(root);
1959 if (!sb->s_root) {
1960 printk(KERN_ERR "EXT3-fs: get root dentry failed\n");
1961 iput(root);
1962 ret = -ENOMEM;
1963 goto failed_mount4;
1964 }
1965
1966 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1967 /*
1968 * akpm: core read_super() calls in here with the superblock locked.
1969 * That deadlocks, because orphan cleanup needs to lock the superblock
1970 * in numerous places. Here we just pop the lock - it's relatively
1971 * harmless, because we are now ready to accept write_super() requests,
1972 * and aviro says that's the only reason for hanging onto the
1973 * superblock lock.
1974 */
1975 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1976 ext3_orphan_cleanup(sb, es);
1977 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1978 if (needs_recovery)
1979 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1980 ext3_mark_recovery_complete(sb, es);
1981 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1982 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1983 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1984 "writeback");
1985
1986 lock_kernel();
1987 return 0;
1988
1989 cantfind_ext3:
1990 if (!silent)
1991 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1992 sb->s_id);
1993 goto failed_mount;
1994
1995 failed_mount4:
1996 journal_destroy(sbi->s_journal);
1997 failed_mount3:
1998 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1999 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2000 percpu_counter_destroy(&sbi->s_dirs_counter);
2001 failed_mount2:
2002 for (i = 0; i < db_count; i++)
2003 brelse(sbi->s_group_desc[i]);
2004 kfree(sbi->s_group_desc);
2005 failed_mount:
2006 #ifdef CONFIG_QUOTA
2007 for (i = 0; i < MAXQUOTAS; i++)
2008 kfree(sbi->s_qf_names[i]);
2009 #endif
2010 ext3_blkdev_remove(sbi);
2011 brelse(bh);
2012 out_fail:
2013 sb->s_fs_info = NULL;
2014 kfree(sbi);
2015 lock_kernel();
2016 return ret;
2017 }
2018
2019 /*
2020 * Setup any per-fs journal parameters now. We'll do this both on
2021 * initial mount, once the journal has been initialised but before we've
2022 * done any recovery; and again on any subsequent remount.
2023 */
2024 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2025 {
2026 struct ext3_sb_info *sbi = EXT3_SB(sb);
2027
2028 if (sbi->s_commit_interval)
2029 journal->j_commit_interval = sbi->s_commit_interval;
2030 /* We could also set up an ext3-specific default for the commit
2031 * interval here, but for now we'll just fall back to the jbd
2032 * default. */
2033
2034 spin_lock(&journal->j_state_lock);
2035 if (test_opt(sb, BARRIER))
2036 journal->j_flags |= JFS_BARRIER;
2037 else
2038 journal->j_flags &= ~JFS_BARRIER;
2039 if (test_opt(sb, DATA_ERR_ABORT))
2040 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2041 else
2042 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2043 spin_unlock(&journal->j_state_lock);
2044 }
2045
2046 static journal_t *ext3_get_journal(struct super_block *sb,
2047 unsigned int journal_inum)
2048 {
2049 struct inode *journal_inode;
2050 journal_t *journal;
2051
2052 /* First, test for the existence of a valid inode on disk. Bad
2053 * things happen if we iget() an unused inode, as the subsequent
2054 * iput() will try to delete it. */
2055
2056 journal_inode = ext3_iget(sb, journal_inum);
2057 if (IS_ERR(journal_inode)) {
2058 printk(KERN_ERR "EXT3-fs: no journal found.\n");
2059 return NULL;
2060 }
2061 if (!journal_inode->i_nlink) {
2062 make_bad_inode(journal_inode);
2063 iput(journal_inode);
2064 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
2065 return NULL;
2066 }
2067
2068 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2069 journal_inode, journal_inode->i_size);
2070 if (!S_ISREG(journal_inode->i_mode)) {
2071 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
2072 iput(journal_inode);
2073 return NULL;
2074 }
2075
2076 journal = journal_init_inode(journal_inode);
2077 if (!journal) {
2078 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
2079 iput(journal_inode);
2080 return NULL;
2081 }
2082 journal->j_private = sb;
2083 ext3_init_journal_params(sb, journal);
2084 return journal;
2085 }
2086
2087 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2088 dev_t j_dev)
2089 {
2090 struct buffer_head * bh;
2091 journal_t *journal;
2092 ext3_fsblk_t start;
2093 ext3_fsblk_t len;
2094 int hblock, blocksize;
2095 ext3_fsblk_t sb_block;
2096 unsigned long offset;
2097 struct ext3_super_block * es;
2098 struct block_device *bdev;
2099
2100 bdev = ext3_blkdev_get(j_dev);
2101 if (bdev == NULL)
2102 return NULL;
2103
2104 if (bd_claim(bdev, sb)) {
2105 printk(KERN_ERR
2106 "EXT3: failed to claim external journal device.\n");
2107 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
2108 return NULL;
2109 }
2110
2111 blocksize = sb->s_blocksize;
2112 hblock = bdev_hardsect_size(bdev);
2113 if (blocksize < hblock) {
2114 printk(KERN_ERR
2115 "EXT3-fs: blocksize too small for journal device.\n");
2116 goto out_bdev;
2117 }
2118
2119 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2120 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2121 set_blocksize(bdev, blocksize);
2122 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2123 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
2124 "external journal\n");
2125 goto out_bdev;
2126 }
2127
2128 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2129 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2130 !(le32_to_cpu(es->s_feature_incompat) &
2131 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2132 printk(KERN_ERR "EXT3-fs: external journal has "
2133 "bad superblock\n");
2134 brelse(bh);
2135 goto out_bdev;
2136 }
2137
2138 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2139 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
2140 brelse(bh);
2141 goto out_bdev;
2142 }
2143
2144 len = le32_to_cpu(es->s_blocks_count);
2145 start = sb_block + 1;
2146 brelse(bh); /* we're done with the superblock */
2147
2148 journal = journal_init_dev(bdev, sb->s_bdev,
2149 start, len, blocksize);
2150 if (!journal) {
2151 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
2152 goto out_bdev;
2153 }
2154 journal->j_private = sb;
2155 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2156 wait_on_buffer(journal->j_sb_buffer);
2157 if (!buffer_uptodate(journal->j_sb_buffer)) {
2158 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
2159 goto out_journal;
2160 }
2161 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2162 printk(KERN_ERR "EXT3-fs: External journal has more than one "
2163 "user (unsupported) - %d\n",
2164 be32_to_cpu(journal->j_superblock->s_nr_users));
2165 goto out_journal;
2166 }
2167 EXT3_SB(sb)->journal_bdev = bdev;
2168 ext3_init_journal_params(sb, journal);
2169 return journal;
2170 out_journal:
2171 journal_destroy(journal);
2172 out_bdev:
2173 ext3_blkdev_put(bdev);
2174 return NULL;
2175 }
2176
2177 static int ext3_load_journal(struct super_block *sb,
2178 struct ext3_super_block *es,
2179 unsigned long journal_devnum)
2180 {
2181 journal_t *journal;
2182 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2183 dev_t journal_dev;
2184 int err = 0;
2185 int really_read_only;
2186
2187 if (journal_devnum &&
2188 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2189 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
2190 "numbers have changed\n");
2191 journal_dev = new_decode_dev(journal_devnum);
2192 } else
2193 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2194
2195 really_read_only = bdev_read_only(sb->s_bdev);
2196
2197 /*
2198 * Are we loading a blank journal or performing recovery after a
2199 * crash? For recovery, we need to check in advance whether we
2200 * can get read-write access to the device.
2201 */
2202
2203 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2204 if (sb->s_flags & MS_RDONLY) {
2205 printk(KERN_INFO "EXT3-fs: INFO: recovery "
2206 "required on readonly filesystem.\n");
2207 if (really_read_only) {
2208 printk(KERN_ERR "EXT3-fs: write access "
2209 "unavailable, cannot proceed.\n");
2210 return -EROFS;
2211 }
2212 printk (KERN_INFO "EXT3-fs: write access will "
2213 "be enabled during recovery.\n");
2214 }
2215 }
2216
2217 if (journal_inum && journal_dev) {
2218 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2219 "and inode journals!\n");
2220 return -EINVAL;
2221 }
2222
2223 if (journal_inum) {
2224 if (!(journal = ext3_get_journal(sb, journal_inum)))
2225 return -EINVAL;
2226 } else {
2227 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2228 return -EINVAL;
2229 }
2230
2231 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2232 err = journal_update_format(journal);
2233 if (err) {
2234 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2235 journal_destroy(journal);
2236 return err;
2237 }
2238 }
2239
2240 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2241 err = journal_wipe(journal, !really_read_only);
2242 if (!err)
2243 err = journal_load(journal);
2244
2245 if (err) {
2246 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2247 journal_destroy(journal);
2248 return err;
2249 }
2250
2251 EXT3_SB(sb)->s_journal = journal;
2252 ext3_clear_journal_err(sb, es);
2253
2254 if (journal_devnum &&
2255 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2256 es->s_journal_dev = cpu_to_le32(journal_devnum);
2257 sb->s_dirt = 1;
2258
2259 /* Make sure we flush the recovery flag to disk. */
2260 ext3_commit_super(sb, es, 1);
2261 }
2262
2263 return 0;
2264 }
2265
2266 static int ext3_create_journal(struct super_block * sb,
2267 struct ext3_super_block * es,
2268 unsigned int journal_inum)
2269 {
2270 journal_t *journal;
2271 int err;
2272
2273 if (sb->s_flags & MS_RDONLY) {
2274 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2275 "create journal.\n");
2276 return -EROFS;
2277 }
2278
2279 journal = ext3_get_journal(sb, journal_inum);
2280 if (!journal)
2281 return -EINVAL;
2282
2283 printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
2284 journal_inum);
2285
2286 err = journal_create(journal);
2287 if (err) {
2288 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2289 journal_destroy(journal);
2290 return -EIO;
2291 }
2292
2293 EXT3_SB(sb)->s_journal = journal;
2294
2295 ext3_update_dynamic_rev(sb);
2296 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2297 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2298
2299 es->s_journal_inum = cpu_to_le32(journal_inum);
2300 sb->s_dirt = 1;
2301
2302 /* Make sure we flush the recovery flag to disk. */
2303 ext3_commit_super(sb, es, 1);
2304
2305 return 0;
2306 }
2307
2308 static void ext3_commit_super (struct super_block * sb,
2309 struct ext3_super_block * es,
2310 int sync)
2311 {
2312 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2313
2314 if (!sbh)
2315 return;
2316 es->s_wtime = cpu_to_le32(get_seconds());
2317 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2318 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2319 BUFFER_TRACE(sbh, "marking dirty");
2320 mark_buffer_dirty(sbh);
2321 if (sync)
2322 sync_dirty_buffer(sbh);
2323 }
2324
2325
2326 /*
2327 * Have we just finished recovery? If so, and if we are mounting (or
2328 * remounting) the filesystem readonly, then we will end up with a
2329 * consistent fs on disk. Record that fact.
2330 */
2331 static void ext3_mark_recovery_complete(struct super_block * sb,
2332 struct ext3_super_block * es)
2333 {
2334 journal_t *journal = EXT3_SB(sb)->s_journal;
2335
2336 journal_lock_updates(journal);
2337 if (journal_flush(journal) < 0)
2338 goto out;
2339
2340 lock_super(sb);
2341 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2342 sb->s_flags & MS_RDONLY) {
2343 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2344 sb->s_dirt = 0;
2345 ext3_commit_super(sb, es, 1);
2346 }
2347 unlock_super(sb);
2348
2349 out:
2350 journal_unlock_updates(journal);
2351 }
2352
2353 /*
2354 * If we are mounting (or read-write remounting) a filesystem whose journal
2355 * has recorded an error from a previous lifetime, move that error to the
2356 * main filesystem now.
2357 */
2358 static void ext3_clear_journal_err(struct super_block * sb,
2359 struct ext3_super_block * es)
2360 {
2361 journal_t *journal;
2362 int j_errno;
2363 const char *errstr;
2364
2365 journal = EXT3_SB(sb)->s_journal;
2366
2367 /*
2368 * Now check for any error status which may have been recorded in the
2369 * journal by a prior ext3_error() or ext3_abort()
2370 */
2371
2372 j_errno = journal_errno(journal);
2373 if (j_errno) {
2374 char nbuf[16];
2375
2376 errstr = ext3_decode_error(sb, j_errno, nbuf);
2377 ext3_warning(sb, __func__, "Filesystem error recorded "
2378 "from previous mount: %s", errstr);
2379 ext3_warning(sb, __func__, "Marking fs in need of "
2380 "filesystem check.");
2381
2382 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2383 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2384 ext3_commit_super (sb, es, 1);
2385
2386 journal_clear_err(journal);
2387 }
2388 }
2389
2390 /*
2391 * Force the running and committing transactions to commit,
2392 * and wait on the commit.
2393 */
2394 int ext3_force_commit(struct super_block *sb)
2395 {
2396 journal_t *journal;
2397 int ret;
2398
2399 if (sb->s_flags & MS_RDONLY)
2400 return 0;
2401
2402 journal = EXT3_SB(sb)->s_journal;
2403 sb->s_dirt = 0;
2404 ret = ext3_journal_force_commit(journal);
2405 return ret;
2406 }
2407
2408 /*
2409 * Ext3 always journals updates to the superblock itself, so we don't
2410 * have to propagate any other updates to the superblock on disk at this
2411 * point. (We can probably nuke this function altogether, and remove
2412 * any mention to sb->s_dirt in all of fs/ext3; eventual cleanup...)
2413 */
2414 static void ext3_write_super (struct super_block * sb)
2415 {
2416 if (mutex_trylock(&sb->s_lock) != 0)
2417 BUG();
2418 sb->s_dirt = 0;
2419 }
2420
2421 static int ext3_sync_fs(struct super_block *sb, int wait)
2422 {
2423 sb->s_dirt = 0;
2424 if (wait)
2425 ext3_force_commit(sb);
2426 else
2427 journal_start_commit(EXT3_SB(sb)->s_journal, NULL);
2428
2429 return 0;
2430 }
2431
2432 /*
2433 * LVM calls this function before a (read-only) snapshot is created. This
2434 * gives us a chance to flush the journal completely and mark the fs clean.
2435 */
2436 static void ext3_write_super_lockfs(struct super_block *sb)
2437 {
2438 sb->s_dirt = 0;
2439
2440 if (!(sb->s_flags & MS_RDONLY)) {
2441 journal_t *journal = EXT3_SB(sb)->s_journal;
2442
2443 /* Now we set up the journal barrier. */
2444 journal_lock_updates(journal);
2445
2446 /*
2447 * We don't want to clear needs_recovery flag when we failed
2448 * to flush the journal.
2449 */
2450 if (journal_flush(journal) < 0)
2451 return;
2452
2453 /* Journal blocked and flushed, clear needs_recovery flag. */
2454 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2455 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2456 }
2457 }
2458
2459 /*
2460 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2461 * flag here, even though the filesystem is not technically dirty yet.
2462 */
2463 static void ext3_unlockfs(struct super_block *sb)
2464 {
2465 if (!(sb->s_flags & MS_RDONLY)) {
2466 lock_super(sb);
2467 /* Reser the needs_recovery flag before the fs is unlocked. */
2468 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2469 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2470 unlock_super(sb);
2471 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2472 }
2473 }
2474
2475 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2476 {
2477 struct ext3_super_block * es;
2478 struct ext3_sb_info *sbi = EXT3_SB(sb);
2479 ext3_fsblk_t n_blocks_count = 0;
2480 unsigned long old_sb_flags;
2481 struct ext3_mount_options old_opts;
2482 int err;
2483 #ifdef CONFIG_QUOTA
2484 int i;
2485 #endif
2486
2487 /* Store the original options */
2488 old_sb_flags = sb->s_flags;
2489 old_opts.s_mount_opt = sbi->s_mount_opt;
2490 old_opts.s_resuid = sbi->s_resuid;
2491 old_opts.s_resgid = sbi->s_resgid;
2492 old_opts.s_commit_interval = sbi->s_commit_interval;
2493 #ifdef CONFIG_QUOTA
2494 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2495 for (i = 0; i < MAXQUOTAS; i++)
2496 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2497 #endif
2498
2499 /*
2500 * Allow the "check" option to be passed as a remount option.
2501 */
2502 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2503 err = -EINVAL;
2504 goto restore_opts;
2505 }
2506
2507 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2508 ext3_abort(sb, __func__, "Abort forced by user");
2509
2510 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2511 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2512
2513 es = sbi->s_es;
2514
2515 ext3_init_journal_params(sb, sbi->s_journal);
2516
2517 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2518 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2519 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2520 err = -EROFS;
2521 goto restore_opts;
2522 }
2523
2524 if (*flags & MS_RDONLY) {
2525 /*
2526 * First of all, the unconditional stuff we have to do
2527 * to disable replay of the journal when we next remount
2528 */
2529 sb->s_flags |= MS_RDONLY;
2530
2531 /*
2532 * OK, test if we are remounting a valid rw partition
2533 * readonly, and if so set the rdonly flag and then
2534 * mark the partition as valid again.
2535 */
2536 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2537 (sbi->s_mount_state & EXT3_VALID_FS))
2538 es->s_state = cpu_to_le16(sbi->s_mount_state);
2539
2540 /*
2541 * We have to unlock super so that we can wait for
2542 * transactions.
2543 */
2544 unlock_super(sb);
2545 ext3_mark_recovery_complete(sb, es);
2546 lock_super(sb);
2547 } else {
2548 __le32 ret;
2549 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2550 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2551 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2552 "remount RDWR because of unsupported "
2553 "optional features (%x).\n",
2554 sb->s_id, le32_to_cpu(ret));
2555 err = -EROFS;
2556 goto restore_opts;
2557 }
2558
2559 /*
2560 * If we have an unprocessed orphan list hanging
2561 * around from a previously readonly bdev mount,
2562 * require a full umount/remount for now.
2563 */
2564 if (es->s_last_orphan) {
2565 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2566 "remount RDWR because of unprocessed "
2567 "orphan inode list. Please "
2568 "umount/remount instead.\n",
2569 sb->s_id);
2570 err = -EINVAL;
2571 goto restore_opts;
2572 }
2573
2574 /*
2575 * Mounting a RDONLY partition read-write, so reread
2576 * and store the current valid flag. (It may have
2577 * been changed by e2fsck since we originally mounted
2578 * the partition.)
2579 */
2580 ext3_clear_journal_err(sb, es);
2581 sbi->s_mount_state = le16_to_cpu(es->s_state);
2582 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2583 goto restore_opts;
2584 if (!ext3_setup_super (sb, es, 0))
2585 sb->s_flags &= ~MS_RDONLY;
2586 }
2587 }
2588 #ifdef CONFIG_QUOTA
2589 /* Release old quota file names */
2590 for (i = 0; i < MAXQUOTAS; i++)
2591 if (old_opts.s_qf_names[i] &&
2592 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2593 kfree(old_opts.s_qf_names[i]);
2594 #endif
2595 return 0;
2596 restore_opts:
2597 sb->s_flags = old_sb_flags;
2598 sbi->s_mount_opt = old_opts.s_mount_opt;
2599 sbi->s_resuid = old_opts.s_resuid;
2600 sbi->s_resgid = old_opts.s_resgid;
2601 sbi->s_commit_interval = old_opts.s_commit_interval;
2602 #ifdef CONFIG_QUOTA
2603 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2604 for (i = 0; i < MAXQUOTAS; i++) {
2605 if (sbi->s_qf_names[i] &&
2606 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2607 kfree(sbi->s_qf_names[i]);
2608 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2609 }
2610 #endif
2611 return err;
2612 }
2613
2614 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2615 {
2616 struct super_block *sb = dentry->d_sb;
2617 struct ext3_sb_info *sbi = EXT3_SB(sb);
2618 struct ext3_super_block *es = sbi->s_es;
2619 u64 fsid;
2620
2621 if (test_opt(sb, MINIX_DF)) {
2622 sbi->s_overhead_last = 0;
2623 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2624 unsigned long ngroups = sbi->s_groups_count, i;
2625 ext3_fsblk_t overhead = 0;
2626 smp_rmb();
2627
2628 /*
2629 * Compute the overhead (FS structures). This is constant
2630 * for a given filesystem unless the number of block groups
2631 * changes so we cache the previous value until it does.
2632 */
2633
2634 /*
2635 * All of the blocks before first_data_block are
2636 * overhead
2637 */
2638 overhead = le32_to_cpu(es->s_first_data_block);
2639
2640 /*
2641 * Add the overhead attributed to the superblock and
2642 * block group descriptors. If the sparse superblocks
2643 * feature is turned on, then not all groups have this.
2644 */
2645 for (i = 0; i < ngroups; i++) {
2646 overhead += ext3_bg_has_super(sb, i) +
2647 ext3_bg_num_gdb(sb, i);
2648 cond_resched();
2649 }
2650
2651 /*
2652 * Every block group has an inode bitmap, a block
2653 * bitmap, and an inode table.
2654 */
2655 overhead += ngroups * (2 + sbi->s_itb_per_group);
2656 sbi->s_overhead_last = overhead;
2657 smp_wmb();
2658 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2659 }
2660
2661 buf->f_type = EXT3_SUPER_MAGIC;
2662 buf->f_bsize = sb->s_blocksize;
2663 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2664 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2665 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
2666 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2667 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2668 buf->f_bavail = 0;
2669 buf->f_files = le32_to_cpu(es->s_inodes_count);
2670 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2671 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
2672 buf->f_namelen = EXT3_NAME_LEN;
2673 fsid = le64_to_cpup((void *)es->s_uuid) ^
2674 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2675 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2676 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2677 return 0;
2678 }
2679
2680 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2681 * is locked for write. Otherwise the are possible deadlocks:
2682 * Process 1 Process 2
2683 * ext3_create() quota_sync()
2684 * journal_start() write_dquot()
2685 * DQUOT_INIT() down(dqio_mutex)
2686 * down(dqio_mutex) journal_start()
2687 *
2688 */
2689
2690 #ifdef CONFIG_QUOTA
2691
2692 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2693 {
2694 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2695 }
2696
2697 static int ext3_dquot_initialize(struct inode *inode, int type)
2698 {
2699 handle_t *handle;
2700 int ret, err;
2701
2702 /* We may create quota structure so we need to reserve enough blocks */
2703 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2704 if (IS_ERR(handle))
2705 return PTR_ERR(handle);
2706 ret = dquot_initialize(inode, type);
2707 err = ext3_journal_stop(handle);
2708 if (!ret)
2709 ret = err;
2710 return ret;
2711 }
2712
2713 static int ext3_dquot_drop(struct inode *inode)
2714 {
2715 handle_t *handle;
2716 int ret, err;
2717
2718 /* We may delete quota structure so we need to reserve enough blocks */
2719 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2720 if (IS_ERR(handle)) {
2721 /*
2722 * We call dquot_drop() anyway to at least release references
2723 * to quota structures so that umount does not hang.
2724 */
2725 dquot_drop(inode);
2726 return PTR_ERR(handle);
2727 }
2728 ret = dquot_drop(inode);
2729 err = ext3_journal_stop(handle);
2730 if (!ret)
2731 ret = err;
2732 return ret;
2733 }
2734
2735 static int ext3_write_dquot(struct dquot *dquot)
2736 {
2737 int ret, err;
2738 handle_t *handle;
2739 struct inode *inode;
2740
2741 inode = dquot_to_inode(dquot);
2742 handle = ext3_journal_start(inode,
2743 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2744 if (IS_ERR(handle))
2745 return PTR_ERR(handle);
2746 ret = dquot_commit(dquot);
2747 err = ext3_journal_stop(handle);
2748 if (!ret)
2749 ret = err;
2750 return ret;
2751 }
2752
2753 static int ext3_acquire_dquot(struct dquot *dquot)
2754 {
2755 int ret, err;
2756 handle_t *handle;
2757
2758 handle = ext3_journal_start(dquot_to_inode(dquot),
2759 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2760 if (IS_ERR(handle))
2761 return PTR_ERR(handle);
2762 ret = dquot_acquire(dquot);
2763 err = ext3_journal_stop(handle);
2764 if (!ret)
2765 ret = err;
2766 return ret;
2767 }
2768
2769 static int ext3_release_dquot(struct dquot *dquot)
2770 {
2771 int ret, err;
2772 handle_t *handle;
2773
2774 handle = ext3_journal_start(dquot_to_inode(dquot),
2775 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2776 if (IS_ERR(handle)) {
2777 /* Release dquot anyway to avoid endless cycle in dqput() */
2778 dquot_release(dquot);
2779 return PTR_ERR(handle);
2780 }
2781 ret = dquot_release(dquot);
2782 err = ext3_journal_stop(handle);
2783 if (!ret)
2784 ret = err;
2785 return ret;
2786 }
2787
2788 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2789 {
2790 /* Are we journaling quotas? */
2791 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2792 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2793 dquot_mark_dquot_dirty(dquot);
2794 return ext3_write_dquot(dquot);
2795 } else {
2796 return dquot_mark_dquot_dirty(dquot);
2797 }
2798 }
2799
2800 static int ext3_write_info(struct super_block *sb, int type)
2801 {
2802 int ret, err;
2803 handle_t *handle;
2804
2805 /* Data block + inode block */
2806 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2807 if (IS_ERR(handle))
2808 return PTR_ERR(handle);
2809 ret = dquot_commit_info(sb, type);
2810 err = ext3_journal_stop(handle);
2811 if (!ret)
2812 ret = err;
2813 return ret;
2814 }
2815
2816 /*
2817 * Turn on quotas during mount time - we need to find
2818 * the quota file and such...
2819 */
2820 static int ext3_quota_on_mount(struct super_block *sb, int type)
2821 {
2822 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2823 EXT3_SB(sb)->s_jquota_fmt, type);
2824 }
2825
2826 /*
2827 * Standard function to be called on quota_on
2828 */
2829 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2830 char *name, int remount)
2831 {
2832 int err;
2833 struct path path;
2834
2835 if (!test_opt(sb, QUOTA))
2836 return -EINVAL;
2837 /* When remounting, no checks are needed and in fact, name is NULL */
2838 if (remount)
2839 return vfs_quota_on(sb, type, format_id, name, remount);
2840
2841 err = kern_path(name, LOOKUP_FOLLOW, &path);
2842 if (err)
2843 return err;
2844
2845 /* Quotafile not on the same filesystem? */
2846 if (path.mnt->mnt_sb != sb) {
2847 path_put(&path);
2848 return -EXDEV;
2849 }
2850 /* Journaling quota? */
2851 if (EXT3_SB(sb)->s_qf_names[type]) {
2852 /* Quotafile not of fs root? */
2853 if (path.dentry->d_parent != sb->s_root)
2854 printk(KERN_WARNING
2855 "EXT3-fs: Quota file not on filesystem root. "
2856 "Journaled quota will not work.\n");
2857 }
2858
2859 /*
2860 * When we journal data on quota file, we have to flush journal to see
2861 * all updates to the file when we bypass pagecache...
2862 */
2863 if (ext3_should_journal_data(path.dentry->d_inode)) {
2864 /*
2865 * We don't need to lock updates but journal_flush() could
2866 * otherwise be livelocked...
2867 */
2868 journal_lock_updates(EXT3_SB(sb)->s_journal);
2869 err = journal_flush(EXT3_SB(sb)->s_journal);
2870 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2871 if (err) {
2872 path_put(&path);
2873 return err;
2874 }
2875 }
2876
2877 err = vfs_quota_on_path(sb, type, format_id, &path);
2878 path_put(&path);
2879 return err;
2880 }
2881
2882 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2883 * acquiring the locks... As quota files are never truncated and quota code
2884 * itself serializes the operations (and noone else should touch the files)
2885 * we don't have to be afraid of races */
2886 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2887 size_t len, loff_t off)
2888 {
2889 struct inode *inode = sb_dqopt(sb)->files[type];
2890 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2891 int err = 0;
2892 int offset = off & (sb->s_blocksize - 1);
2893 int tocopy;
2894 size_t toread;
2895 struct buffer_head *bh;
2896 loff_t i_size = i_size_read(inode);
2897
2898 if (off > i_size)
2899 return 0;
2900 if (off+len > i_size)
2901 len = i_size-off;
2902 toread = len;
2903 while (toread > 0) {
2904 tocopy = sb->s_blocksize - offset < toread ?
2905 sb->s_blocksize - offset : toread;
2906 bh = ext3_bread(NULL, inode, blk, 0, &err);
2907 if (err)
2908 return err;
2909 if (!bh) /* A hole? */
2910 memset(data, 0, tocopy);
2911 else
2912 memcpy(data, bh->b_data+offset, tocopy);
2913 brelse(bh);
2914 offset = 0;
2915 toread -= tocopy;
2916 data += tocopy;
2917 blk++;
2918 }
2919 return len;
2920 }
2921
2922 /* Write to quotafile (we know the transaction is already started and has
2923 * enough credits) */
2924 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2925 const char *data, size_t len, loff_t off)
2926 {
2927 struct inode *inode = sb_dqopt(sb)->files[type];
2928 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2929 int err = 0;
2930 int offset = off & (sb->s_blocksize - 1);
2931 int tocopy;
2932 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2933 size_t towrite = len;
2934 struct buffer_head *bh;
2935 handle_t *handle = journal_current_handle();
2936
2937 if (!handle) {
2938 printk(KERN_WARNING "EXT3-fs: Quota write (off=%Lu, len=%Lu)"
2939 " cancelled because transaction is not started.\n",
2940 (unsigned long long)off, (unsigned long long)len);
2941 return -EIO;
2942 }
2943 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2944 while (towrite > 0) {
2945 tocopy = sb->s_blocksize - offset < towrite ?
2946 sb->s_blocksize - offset : towrite;
2947 bh = ext3_bread(handle, inode, blk, 1, &err);
2948 if (!bh)
2949 goto out;
2950 if (journal_quota) {
2951 err = ext3_journal_get_write_access(handle, bh);
2952 if (err) {
2953 brelse(bh);
2954 goto out;
2955 }
2956 }
2957 lock_buffer(bh);
2958 memcpy(bh->b_data+offset, data, tocopy);
2959 flush_dcache_page(bh->b_page);
2960 unlock_buffer(bh);
2961 if (journal_quota)
2962 err = ext3_journal_dirty_metadata(handle, bh);
2963 else {
2964 /* Always do at least ordered writes for quotas */
2965 err = ext3_journal_dirty_data(handle, bh);
2966 mark_buffer_dirty(bh);
2967 }
2968 brelse(bh);
2969 if (err)
2970 goto out;
2971 offset = 0;
2972 towrite -= tocopy;
2973 data += tocopy;
2974 blk++;
2975 }
2976 out:
2977 if (len == towrite) {
2978 mutex_unlock(&inode->i_mutex);
2979 return err;
2980 }
2981 if (inode->i_size < off+len-towrite) {
2982 i_size_write(inode, off+len-towrite);
2983 EXT3_I(inode)->i_disksize = inode->i_size;
2984 }
2985 inode->i_version++;
2986 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2987 ext3_mark_inode_dirty(handle, inode);
2988 mutex_unlock(&inode->i_mutex);
2989 return len - towrite;
2990 }
2991
2992 #endif
2993
2994 static int ext3_get_sb(struct file_system_type *fs_type,
2995 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2996 {
2997 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2998 }
2999
3000 static struct file_system_type ext3_fs_type = {
3001 .owner = THIS_MODULE,
3002 .name = "ext3",
3003 .get_sb = ext3_get_sb,
3004 .kill_sb = kill_block_super,
3005 .fs_flags = FS_REQUIRES_DEV,
3006 };
3007
3008 static int __init init_ext3_fs(void)
3009 {
3010 int err = init_ext3_xattr();
3011 if (err)
3012 return err;
3013 err = init_inodecache();
3014 if (err)
3015 goto out1;
3016 err = register_filesystem(&ext3_fs_type);
3017 if (err)
3018 goto out;
3019 return 0;
3020 out:
3021 destroy_inodecache();
3022 out1:
3023 exit_ext3_xattr();
3024 return err;
3025 }
3026
3027 static void __exit exit_ext3_fs(void)
3028 {
3029 unregister_filesystem(&ext3_fs_type);
3030 destroy_inodecache();
3031 exit_ext3_xattr();
3032 }
3033
3034 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3035 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3036 MODULE_LICENSE("GPL");
3037 module_init(init_ext3_fs)
3038 module_exit(exit_ext3_fs)
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree