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Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / fs / ext3 / super.c
1 /*
2 * linux/fs/ext3/super.c
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19 #include <linux/module.h>
20 #include <linux/blkdev.h>
21 #include <linux/parser.h>
22 #include <linux/exportfs.h>
23 #include <linux/statfs.h>
24 #include <linux/random.h>
25 #include <linux/mount.h>
26 #include <linux/quotaops.h>
27 #include <linux/seq_file.h>
28 #include <linux/log2.h>
29 #include <linux/cleancache.h>
30 #include <linux/namei.h>
31
32 #include <asm/uaccess.h>
33
34 #define CREATE_TRACE_POINTS
35
36 #include "ext3.h"
37 #include "xattr.h"
38 #include "acl.h"
39 #include "namei.h"
40
41 #ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
42 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
43 #else
44 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
45 #endif
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 int 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 int ext3_unfreeze(struct super_block *sb);
64 static int ext3_freeze(struct super_block *sb);
65
66 /*
67 * Wrappers for journal_start/end.
68 */
69 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
70 {
71 journal_t *journal;
72
73 if (sb->s_flags & MS_RDONLY)
74 return ERR_PTR(-EROFS);
75
76 /* Special case here: if the journal has aborted behind our
77 * backs (eg. EIO in the commit thread), then we still need to
78 * take the FS itself readonly cleanly. */
79 journal = EXT3_SB(sb)->s_journal;
80 if (is_journal_aborted(journal)) {
81 ext3_abort(sb, __func__,
82 "Detected aborted journal");
83 return ERR_PTR(-EROFS);
84 }
85
86 return journal_start(journal, nblocks);
87 }
88
89 int __ext3_journal_stop(const char *where, handle_t *handle)
90 {
91 struct super_block *sb;
92 int err;
93 int rc;
94
95 sb = handle->h_transaction->t_journal->j_private;
96 err = handle->h_err;
97 rc = journal_stop(handle);
98
99 if (!err)
100 err = rc;
101 if (err)
102 __ext3_std_error(sb, where, err);
103 return err;
104 }
105
106 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
107 struct buffer_head *bh, handle_t *handle, int err)
108 {
109 char nbuf[16];
110 const char *errstr = ext3_decode_error(NULL, err, nbuf);
111
112 if (bh)
113 BUFFER_TRACE(bh, "abort");
114
115 if (!handle->h_err)
116 handle->h_err = err;
117
118 if (is_handle_aborted(handle))
119 return;
120
121 printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
122 caller, errstr, err_fn);
123
124 journal_abort_handle(handle);
125 }
126
127 void ext3_msg(struct super_block *sb, const char *prefix,
128 const char *fmt, ...)
129 {
130 struct va_format vaf;
131 va_list args;
132
133 va_start(args, fmt);
134
135 vaf.fmt = fmt;
136 vaf.va = &args;
137
138 printk("%sEXT3-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
139
140 va_end(args);
141 }
142
143 /* Deal with the reporting of failure conditions on a filesystem such as
144 * inconsistencies detected or read IO failures.
145 *
146 * On ext2, we can store the error state of the filesystem in the
147 * superblock. That is not possible on ext3, because we may have other
148 * write ordering constraints on the superblock which prevent us from
149 * writing it out straight away; and given that the journal is about to
150 * be aborted, we can't rely on the current, or future, transactions to
151 * write out the superblock safely.
152 *
153 * We'll just use the journal_abort() error code to record an error in
154 * the journal instead. On recovery, the journal will complain about
155 * that error until we've noted it down and cleared it.
156 */
157
158 static void ext3_handle_error(struct super_block *sb)
159 {
160 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
161
162 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
163 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
164
165 if (sb->s_flags & MS_RDONLY)
166 return;
167
168 if (!test_opt (sb, ERRORS_CONT)) {
169 journal_t *journal = EXT3_SB(sb)->s_journal;
170
171 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
172 if (journal)
173 journal_abort(journal, -EIO);
174 }
175 if (test_opt (sb, ERRORS_RO)) {
176 ext3_msg(sb, KERN_CRIT,
177 "error: remounting filesystem read-only");
178 /*
179 * Make sure updated value of ->s_mount_state will be visible
180 * before ->s_flags update.
181 */
182 smp_wmb();
183 sb->s_flags |= MS_RDONLY;
184 }
185 ext3_commit_super(sb, es, 1);
186 if (test_opt(sb, ERRORS_PANIC))
187 panic("EXT3-fs (%s): panic forced after error\n",
188 sb->s_id);
189 }
190
191 void ext3_error(struct super_block *sb, const char *function,
192 const char *fmt, ...)
193 {
194 struct va_format vaf;
195 va_list args;
196
197 va_start(args, fmt);
198
199 vaf.fmt = fmt;
200 vaf.va = &args;
201
202 printk(KERN_CRIT "EXT3-fs error (device %s): %s: %pV\n",
203 sb->s_id, function, &vaf);
204
205 va_end(args);
206
207 ext3_handle_error(sb);
208 }
209
210 static const char *ext3_decode_error(struct super_block * sb, int errno,
211 char nbuf[16])
212 {
213 char *errstr = NULL;
214
215 switch (errno) {
216 case -EIO:
217 errstr = "IO failure";
218 break;
219 case -ENOMEM:
220 errstr = "Out of memory";
221 break;
222 case -EROFS:
223 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
224 errstr = "Journal has aborted";
225 else
226 errstr = "Readonly filesystem";
227 break;
228 default:
229 /* If the caller passed in an extra buffer for unknown
230 * errors, textualise them now. Else we just return
231 * NULL. */
232 if (nbuf) {
233 /* Check for truncated error codes... */
234 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
235 errstr = nbuf;
236 }
237 break;
238 }
239
240 return errstr;
241 }
242
243 /* __ext3_std_error decodes expected errors from journaling functions
244 * automatically and invokes the appropriate error response. */
245
246 void __ext3_std_error (struct super_block * sb, const char * function,
247 int errno)
248 {
249 char nbuf[16];
250 const char *errstr;
251
252 /* Special case: if the error is EROFS, and we're not already
253 * inside a transaction, then there's really no point in logging
254 * an error. */
255 if (errno == -EROFS && journal_current_handle() == NULL &&
256 (sb->s_flags & MS_RDONLY))
257 return;
258
259 errstr = ext3_decode_error(sb, errno, nbuf);
260 ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
261
262 ext3_handle_error(sb);
263 }
264
265 /*
266 * ext3_abort is a much stronger failure handler than ext3_error. The
267 * abort function may be used to deal with unrecoverable failures such
268 * as journal IO errors or ENOMEM at a critical moment in log management.
269 *
270 * We unconditionally force the filesystem into an ABORT|READONLY state,
271 * unless the error response on the fs has been set to panic in which
272 * case we take the easy way out and panic immediately.
273 */
274
275 void ext3_abort(struct super_block *sb, const char *function,
276 const char *fmt, ...)
277 {
278 struct va_format vaf;
279 va_list args;
280
281 va_start(args, fmt);
282
283 vaf.fmt = fmt;
284 vaf.va = &args;
285
286 printk(KERN_CRIT "EXT3-fs (%s): error: %s: %pV\n",
287 sb->s_id, function, &vaf);
288
289 va_end(args);
290
291 if (test_opt(sb, ERRORS_PANIC))
292 panic("EXT3-fs: panic from previous error\n");
293
294 if (sb->s_flags & MS_RDONLY)
295 return;
296
297 ext3_msg(sb, KERN_CRIT,
298 "error: remounting filesystem read-only");
299 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
300 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
301 /*
302 * Make sure updated value of ->s_mount_state will be visible
303 * before ->s_flags update.
304 */
305 smp_wmb();
306 sb->s_flags |= MS_RDONLY;
307
308 if (EXT3_SB(sb)->s_journal)
309 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
310 }
311
312 void ext3_warning(struct super_block *sb, const char *function,
313 const char *fmt, ...)
314 {
315 struct va_format vaf;
316 va_list args;
317
318 va_start(args, fmt);
319
320 vaf.fmt = fmt;
321 vaf.va = &args;
322
323 printk(KERN_WARNING "EXT3-fs (%s): warning: %s: %pV\n",
324 sb->s_id, function, &vaf);
325
326 va_end(args);
327 }
328
329 void ext3_update_dynamic_rev(struct super_block *sb)
330 {
331 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
332
333 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
334 return;
335
336 ext3_msg(sb, KERN_WARNING,
337 "warning: updating to rev %d because of "
338 "new feature flag, running e2fsck is recommended",
339 EXT3_DYNAMIC_REV);
340
341 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
342 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
343 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
344 /* leave es->s_feature_*compat flags alone */
345 /* es->s_uuid will be set by e2fsck if empty */
346
347 /*
348 * The rest of the superblock fields should be zero, and if not it
349 * means they are likely already in use, so leave them alone. We
350 * can leave it up to e2fsck to clean up any inconsistencies there.
351 */
352 }
353
354 /*
355 * Open the external journal device
356 */
357 static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
358 {
359 struct block_device *bdev;
360 char b[BDEVNAME_SIZE];
361
362 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
363 if (IS_ERR(bdev))
364 goto fail;
365 return bdev;
366
367 fail:
368 ext3_msg(sb, KERN_ERR, "error: failed to open journal device %s: %ld",
369 __bdevname(dev, b), PTR_ERR(bdev));
370
371 return NULL;
372 }
373
374 /*
375 * Release the journal device
376 */
377 static void ext3_blkdev_put(struct block_device *bdev)
378 {
379 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
380 }
381
382 static void ext3_blkdev_remove(struct ext3_sb_info *sbi)
383 {
384 struct block_device *bdev;
385 bdev = sbi->journal_bdev;
386 if (bdev) {
387 ext3_blkdev_put(bdev);
388 sbi->journal_bdev = NULL;
389 }
390 }
391
392 static inline struct inode *orphan_list_entry(struct list_head *l)
393 {
394 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
395 }
396
397 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
398 {
399 struct list_head *l;
400
401 ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
402 le32_to_cpu(sbi->s_es->s_last_orphan));
403
404 ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
405 list_for_each(l, &sbi->s_orphan) {
406 struct inode *inode = orphan_list_entry(l);
407 ext3_msg(sb, KERN_ERR, " "
408 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
409 inode->i_sb->s_id, inode->i_ino, inode,
410 inode->i_mode, inode->i_nlink,
411 NEXT_ORPHAN(inode));
412 }
413 }
414
415 static void ext3_put_super (struct super_block * sb)
416 {
417 struct ext3_sb_info *sbi = EXT3_SB(sb);
418 struct ext3_super_block *es = sbi->s_es;
419 int i, err;
420
421 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
422 ext3_xattr_put_super(sb);
423 err = journal_destroy(sbi->s_journal);
424 sbi->s_journal = NULL;
425 if (err < 0)
426 ext3_abort(sb, __func__, "Couldn't clean up the journal");
427
428 if (!(sb->s_flags & MS_RDONLY)) {
429 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
430 es->s_state = cpu_to_le16(sbi->s_mount_state);
431 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
432 mark_buffer_dirty(sbi->s_sbh);
433 ext3_commit_super(sb, es, 1);
434 }
435
436 for (i = 0; i < sbi->s_gdb_count; i++)
437 brelse(sbi->s_group_desc[i]);
438 kfree(sbi->s_group_desc);
439 percpu_counter_destroy(&sbi->s_freeblocks_counter);
440 percpu_counter_destroy(&sbi->s_freeinodes_counter);
441 percpu_counter_destroy(&sbi->s_dirs_counter);
442 brelse(sbi->s_sbh);
443 #ifdef CONFIG_QUOTA
444 for (i = 0; i < EXT3_MAXQUOTAS; i++)
445 kfree(sbi->s_qf_names[i]);
446 #endif
447
448 /* Debugging code just in case the in-memory inode orphan list
449 * isn't empty. The on-disk one can be non-empty if we've
450 * detected an error and taken the fs readonly, but the
451 * in-memory list had better be clean by this point. */
452 if (!list_empty(&sbi->s_orphan))
453 dump_orphan_list(sb, sbi);
454 J_ASSERT(list_empty(&sbi->s_orphan));
455
456 invalidate_bdev(sb->s_bdev);
457 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
458 /*
459 * Invalidate the journal device's buffers. We don't want them
460 * floating about in memory - the physical journal device may
461 * hotswapped, and it breaks the `ro-after' testing code.
462 */
463 sync_blockdev(sbi->journal_bdev);
464 invalidate_bdev(sbi->journal_bdev);
465 ext3_blkdev_remove(sbi);
466 }
467 sb->s_fs_info = NULL;
468 kfree(sbi->s_blockgroup_lock);
469 kfree(sbi);
470 }
471
472 static struct kmem_cache *ext3_inode_cachep;
473
474 /*
475 * Called inside transaction, so use GFP_NOFS
476 */
477 static struct inode *ext3_alloc_inode(struct super_block *sb)
478 {
479 struct ext3_inode_info *ei;
480
481 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
482 if (!ei)
483 return NULL;
484 ei->i_block_alloc_info = NULL;
485 ei->vfs_inode.i_version = 1;
486 atomic_set(&ei->i_datasync_tid, 0);
487 atomic_set(&ei->i_sync_tid, 0);
488 return &ei->vfs_inode;
489 }
490
491 static int ext3_drop_inode(struct inode *inode)
492 {
493 int drop = generic_drop_inode(inode);
494
495 trace_ext3_drop_inode(inode, drop);
496 return drop;
497 }
498
499 static void ext3_i_callback(struct rcu_head *head)
500 {
501 struct inode *inode = container_of(head, struct inode, i_rcu);
502 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
503 }
504
505 static void ext3_destroy_inode(struct inode *inode)
506 {
507 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
508 printk("EXT3 Inode %p: orphan list check failed!\n",
509 EXT3_I(inode));
510 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
511 EXT3_I(inode), sizeof(struct ext3_inode_info),
512 false);
513 dump_stack();
514 }
515 call_rcu(&inode->i_rcu, ext3_i_callback);
516 }
517
518 static void init_once(void *foo)
519 {
520 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
521
522 INIT_LIST_HEAD(&ei->i_orphan);
523 #ifdef CONFIG_EXT3_FS_XATTR
524 init_rwsem(&ei->xattr_sem);
525 #endif
526 mutex_init(&ei->truncate_mutex);
527 inode_init_once(&ei->vfs_inode);
528 }
529
530 static int __init init_inodecache(void)
531 {
532 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
533 sizeof(struct ext3_inode_info),
534 0, (SLAB_RECLAIM_ACCOUNT|
535 SLAB_MEM_SPREAD),
536 init_once);
537 if (ext3_inode_cachep == NULL)
538 return -ENOMEM;
539 return 0;
540 }
541
542 static void destroy_inodecache(void)
543 {
544 /*
545 * Make sure all delayed rcu free inodes are flushed before we
546 * destroy cache.
547 */
548 rcu_barrier();
549 kmem_cache_destroy(ext3_inode_cachep);
550 }
551
552 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
553 {
554 #if defined(CONFIG_QUOTA)
555 struct ext3_sb_info *sbi = EXT3_SB(sb);
556
557 if (sbi->s_jquota_fmt) {
558 char *fmtname = "";
559
560 switch (sbi->s_jquota_fmt) {
561 case QFMT_VFS_OLD:
562 fmtname = "vfsold";
563 break;
564 case QFMT_VFS_V0:
565 fmtname = "vfsv0";
566 break;
567 case QFMT_VFS_V1:
568 fmtname = "vfsv1";
569 break;
570 }
571 seq_printf(seq, ",jqfmt=%s", fmtname);
572 }
573
574 if (sbi->s_qf_names[USRQUOTA])
575 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
576
577 if (sbi->s_qf_names[GRPQUOTA])
578 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
579
580 if (test_opt(sb, USRQUOTA))
581 seq_puts(seq, ",usrquota");
582
583 if (test_opt(sb, GRPQUOTA))
584 seq_puts(seq, ",grpquota");
585 #endif
586 }
587
588 static char *data_mode_string(unsigned long mode)
589 {
590 switch (mode) {
591 case EXT3_MOUNT_JOURNAL_DATA:
592 return "journal";
593 case EXT3_MOUNT_ORDERED_DATA:
594 return "ordered";
595 case EXT3_MOUNT_WRITEBACK_DATA:
596 return "writeback";
597 }
598 return "unknown";
599 }
600
601 /*
602 * Show an option if
603 * - it's set to a non-default value OR
604 * - if the per-sb default is different from the global default
605 */
606 static int ext3_show_options(struct seq_file *seq, struct dentry *root)
607 {
608 struct super_block *sb = root->d_sb;
609 struct ext3_sb_info *sbi = EXT3_SB(sb);
610 struct ext3_super_block *es = sbi->s_es;
611 unsigned long def_mount_opts;
612
613 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
614
615 if (sbi->s_sb_block != 1)
616 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
617 if (test_opt(sb, MINIX_DF))
618 seq_puts(seq, ",minixdf");
619 if (test_opt(sb, GRPID))
620 seq_puts(seq, ",grpid");
621 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
622 seq_puts(seq, ",nogrpid");
623 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT3_DEF_RESUID)) ||
624 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
625 seq_printf(seq, ",resuid=%u",
626 from_kuid_munged(&init_user_ns, sbi->s_resuid));
627 }
628 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT3_DEF_RESGID)) ||
629 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
630 seq_printf(seq, ",resgid=%u",
631 from_kgid_munged(&init_user_ns, sbi->s_resgid));
632 }
633 if (test_opt(sb, ERRORS_RO)) {
634 int def_errors = le16_to_cpu(es->s_errors);
635
636 if (def_errors == EXT3_ERRORS_PANIC ||
637 def_errors == EXT3_ERRORS_CONTINUE) {
638 seq_puts(seq, ",errors=remount-ro");
639 }
640 }
641 if (test_opt(sb, ERRORS_CONT))
642 seq_puts(seq, ",errors=continue");
643 if (test_opt(sb, ERRORS_PANIC))
644 seq_puts(seq, ",errors=panic");
645 if (test_opt(sb, NO_UID32))
646 seq_puts(seq, ",nouid32");
647 if (test_opt(sb, DEBUG))
648 seq_puts(seq, ",debug");
649 #ifdef CONFIG_EXT3_FS_XATTR
650 if (test_opt(sb, XATTR_USER))
651 seq_puts(seq, ",user_xattr");
652 if (!test_opt(sb, XATTR_USER) &&
653 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
654 seq_puts(seq, ",nouser_xattr");
655 }
656 #endif
657 #ifdef CONFIG_EXT3_FS_POSIX_ACL
658 if (test_opt(sb, POSIX_ACL))
659 seq_puts(seq, ",acl");
660 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
661 seq_puts(seq, ",noacl");
662 #endif
663 if (!test_opt(sb, RESERVATION))
664 seq_puts(seq, ",noreservation");
665 if (sbi->s_commit_interval) {
666 seq_printf(seq, ",commit=%u",
667 (unsigned) (sbi->s_commit_interval / HZ));
668 }
669
670 /*
671 * Always display barrier state so it's clear what the status is.
672 */
673 seq_puts(seq, ",barrier=");
674 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
675 seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
676 if (test_opt(sb, DATA_ERR_ABORT))
677 seq_puts(seq, ",data_err=abort");
678
679 if (test_opt(sb, NOLOAD))
680 seq_puts(seq, ",norecovery");
681
682 ext3_show_quota_options(seq, sb);
683
684 return 0;
685 }
686
687
688 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
689 u64 ino, u32 generation)
690 {
691 struct inode *inode;
692
693 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
694 return ERR_PTR(-ESTALE);
695 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
696 return ERR_PTR(-ESTALE);
697
698 /* iget isn't really right if the inode is currently unallocated!!
699 *
700 * ext3_read_inode will return a bad_inode if the inode had been
701 * deleted, so we should be safe.
702 *
703 * Currently we don't know the generation for parent directory, so
704 * a generation of 0 means "accept any"
705 */
706 inode = ext3_iget(sb, ino);
707 if (IS_ERR(inode))
708 return ERR_CAST(inode);
709 if (generation && inode->i_generation != generation) {
710 iput(inode);
711 return ERR_PTR(-ESTALE);
712 }
713
714 return inode;
715 }
716
717 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
718 int fh_len, int fh_type)
719 {
720 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
721 ext3_nfs_get_inode);
722 }
723
724 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
725 int fh_len, int fh_type)
726 {
727 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
728 ext3_nfs_get_inode);
729 }
730
731 /*
732 * Try to release metadata pages (indirect blocks, directories) which are
733 * mapped via the block device. Since these pages could have journal heads
734 * which would prevent try_to_free_buffers() from freeing them, we must use
735 * jbd layer's try_to_free_buffers() function to release them.
736 */
737 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
738 gfp_t wait)
739 {
740 journal_t *journal = EXT3_SB(sb)->s_journal;
741
742 WARN_ON(PageChecked(page));
743 if (!page_has_buffers(page))
744 return 0;
745 if (journal)
746 return journal_try_to_free_buffers(journal, page,
747 wait & ~__GFP_WAIT);
748 return try_to_free_buffers(page);
749 }
750
751 #ifdef CONFIG_QUOTA
752 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
753 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
754
755 static int ext3_write_dquot(struct dquot *dquot);
756 static int ext3_acquire_dquot(struct dquot *dquot);
757 static int ext3_release_dquot(struct dquot *dquot);
758 static int ext3_mark_dquot_dirty(struct dquot *dquot);
759 static int ext3_write_info(struct super_block *sb, int type);
760 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
761 struct path *path);
762 static int ext3_quota_on_mount(struct super_block *sb, int type);
763 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
764 size_t len, loff_t off);
765 static ssize_t ext3_quota_write(struct super_block *sb, int type,
766 const char *data, size_t len, loff_t off);
767
768 static const struct dquot_operations ext3_quota_operations = {
769 .write_dquot = ext3_write_dquot,
770 .acquire_dquot = ext3_acquire_dquot,
771 .release_dquot = ext3_release_dquot,
772 .mark_dirty = ext3_mark_dquot_dirty,
773 .write_info = ext3_write_info,
774 .alloc_dquot = dquot_alloc,
775 .destroy_dquot = dquot_destroy,
776 };
777
778 static const struct quotactl_ops ext3_qctl_operations = {
779 .quota_on = ext3_quota_on,
780 .quota_off = dquot_quota_off,
781 .quota_sync = dquot_quota_sync,
782 .get_info = dquot_get_dqinfo,
783 .set_info = dquot_set_dqinfo,
784 .get_dqblk = dquot_get_dqblk,
785 .set_dqblk = dquot_set_dqblk
786 };
787 #endif
788
789 static const struct super_operations ext3_sops = {
790 .alloc_inode = ext3_alloc_inode,
791 .destroy_inode = ext3_destroy_inode,
792 .write_inode = ext3_write_inode,
793 .dirty_inode = ext3_dirty_inode,
794 .drop_inode = ext3_drop_inode,
795 .evict_inode = ext3_evict_inode,
796 .put_super = ext3_put_super,
797 .sync_fs = ext3_sync_fs,
798 .freeze_fs = ext3_freeze,
799 .unfreeze_fs = ext3_unfreeze,
800 .statfs = ext3_statfs,
801 .remount_fs = ext3_remount,
802 .show_options = ext3_show_options,
803 #ifdef CONFIG_QUOTA
804 .quota_read = ext3_quota_read,
805 .quota_write = ext3_quota_write,
806 #endif
807 .bdev_try_to_free_page = bdev_try_to_free_page,
808 };
809
810 static const struct export_operations ext3_export_ops = {
811 .fh_to_dentry = ext3_fh_to_dentry,
812 .fh_to_parent = ext3_fh_to_parent,
813 .get_parent = ext3_get_parent,
814 };
815
816 enum {
817 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
818 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
819 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
820 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
821 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
822 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
823 Opt_journal_path,
824 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
825 Opt_data_err_abort, Opt_data_err_ignore,
826 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
827 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
828 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
829 Opt_resize, Opt_usrquota, Opt_grpquota
830 };
831
832 static const match_table_t tokens = {
833 {Opt_bsd_df, "bsddf"},
834 {Opt_minix_df, "minixdf"},
835 {Opt_grpid, "grpid"},
836 {Opt_grpid, "bsdgroups"},
837 {Opt_nogrpid, "nogrpid"},
838 {Opt_nogrpid, "sysvgroups"},
839 {Opt_resgid, "resgid=%u"},
840 {Opt_resuid, "resuid=%u"},
841 {Opt_sb, "sb=%u"},
842 {Opt_err_cont, "errors=continue"},
843 {Opt_err_panic, "errors=panic"},
844 {Opt_err_ro, "errors=remount-ro"},
845 {Opt_nouid32, "nouid32"},
846 {Opt_nocheck, "nocheck"},
847 {Opt_nocheck, "check=none"},
848 {Opt_debug, "debug"},
849 {Opt_oldalloc, "oldalloc"},
850 {Opt_orlov, "orlov"},
851 {Opt_user_xattr, "user_xattr"},
852 {Opt_nouser_xattr, "nouser_xattr"},
853 {Opt_acl, "acl"},
854 {Opt_noacl, "noacl"},
855 {Opt_reservation, "reservation"},
856 {Opt_noreservation, "noreservation"},
857 {Opt_noload, "noload"},
858 {Opt_noload, "norecovery"},
859 {Opt_nobh, "nobh"},
860 {Opt_bh, "bh"},
861 {Opt_commit, "commit=%u"},
862 {Opt_journal_update, "journal=update"},
863 {Opt_journal_inum, "journal=%u"},
864 {Opt_journal_dev, "journal_dev=%u"},
865 {Opt_journal_path, "journal_path=%s"},
866 {Opt_abort, "abort"},
867 {Opt_data_journal, "data=journal"},
868 {Opt_data_ordered, "data=ordered"},
869 {Opt_data_writeback, "data=writeback"},
870 {Opt_data_err_abort, "data_err=abort"},
871 {Opt_data_err_ignore, "data_err=ignore"},
872 {Opt_offusrjquota, "usrjquota="},
873 {Opt_usrjquota, "usrjquota=%s"},
874 {Opt_offgrpjquota, "grpjquota="},
875 {Opt_grpjquota, "grpjquota=%s"},
876 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
877 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
878 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
879 {Opt_grpquota, "grpquota"},
880 {Opt_noquota, "noquota"},
881 {Opt_quota, "quota"},
882 {Opt_usrquota, "usrquota"},
883 {Opt_barrier, "barrier=%u"},
884 {Opt_barrier, "barrier"},
885 {Opt_nobarrier, "nobarrier"},
886 {Opt_resize, "resize"},
887 {Opt_err, NULL},
888 };
889
890 static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
891 {
892 ext3_fsblk_t sb_block;
893 char *options = (char *) *data;
894
895 if (!options || strncmp(options, "sb=", 3) != 0)
896 return 1; /* Default location */
897 options += 3;
898 /*todo: use simple_strtoll with >32bit ext3 */
899 sb_block = simple_strtoul(options, &options, 0);
900 if (*options && *options != ',') {
901 ext3_msg(sb, KERN_ERR, "error: invalid sb specification: %s",
902 (char *) *data);
903 return 1;
904 }
905 if (*options == ',')
906 options++;
907 *data = (void *) options;
908 return sb_block;
909 }
910
911 #ifdef CONFIG_QUOTA
912 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
913 {
914 struct ext3_sb_info *sbi = EXT3_SB(sb);
915 char *qname;
916
917 if (sb_any_quota_loaded(sb) &&
918 !sbi->s_qf_names[qtype]) {
919 ext3_msg(sb, KERN_ERR,
920 "Cannot change journaled "
921 "quota options when quota turned on");
922 return 0;
923 }
924 qname = match_strdup(args);
925 if (!qname) {
926 ext3_msg(sb, KERN_ERR,
927 "Not enough memory for storing quotafile name");
928 return 0;
929 }
930 if (sbi->s_qf_names[qtype]) {
931 int same = !strcmp(sbi->s_qf_names[qtype], qname);
932
933 kfree(qname);
934 if (!same) {
935 ext3_msg(sb, KERN_ERR,
936 "%s quota file already specified",
937 QTYPE2NAME(qtype));
938 }
939 return same;
940 }
941 if (strchr(qname, '/')) {
942 ext3_msg(sb, KERN_ERR,
943 "quotafile must be on filesystem root");
944 kfree(qname);
945 return 0;
946 }
947 sbi->s_qf_names[qtype] = qname;
948 set_opt(sbi->s_mount_opt, QUOTA);
949 return 1;
950 }
951
952 static int clear_qf_name(struct super_block *sb, int qtype) {
953
954 struct ext3_sb_info *sbi = EXT3_SB(sb);
955
956 if (sb_any_quota_loaded(sb) &&
957 sbi->s_qf_names[qtype]) {
958 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
959 " when quota turned on");
960 return 0;
961 }
962 if (sbi->s_qf_names[qtype]) {
963 kfree(sbi->s_qf_names[qtype]);
964 sbi->s_qf_names[qtype] = NULL;
965 }
966 return 1;
967 }
968 #endif
969
970 static int parse_options (char *options, struct super_block *sb,
971 unsigned int *inum, unsigned long *journal_devnum,
972 ext3_fsblk_t *n_blocks_count, int is_remount)
973 {
974 struct ext3_sb_info *sbi = EXT3_SB(sb);
975 char * p;
976 substring_t args[MAX_OPT_ARGS];
977 int data_opt = 0;
978 int option;
979 kuid_t uid;
980 kgid_t gid;
981 char *journal_path;
982 struct inode *journal_inode;
983 struct path path;
984 int error;
985
986 #ifdef CONFIG_QUOTA
987 int qfmt;
988 #endif
989
990 if (!options)
991 return 1;
992
993 while ((p = strsep (&options, ",")) != NULL) {
994 int token;
995 if (!*p)
996 continue;
997 /*
998 * Initialize args struct so we know whether arg was
999 * found; some options take optional arguments.
1000 */
1001 args[0].to = args[0].from = NULL;
1002 token = match_token(p, tokens, args);
1003 switch (token) {
1004 case Opt_bsd_df:
1005 clear_opt (sbi->s_mount_opt, MINIX_DF);
1006 break;
1007 case Opt_minix_df:
1008 set_opt (sbi->s_mount_opt, MINIX_DF);
1009 break;
1010 case Opt_grpid:
1011 set_opt (sbi->s_mount_opt, GRPID);
1012 break;
1013 case Opt_nogrpid:
1014 clear_opt (sbi->s_mount_opt, GRPID);
1015 break;
1016 case Opt_resuid:
1017 if (match_int(&args[0], &option))
1018 return 0;
1019 uid = make_kuid(current_user_ns(), option);
1020 if (!uid_valid(uid)) {
1021 ext3_msg(sb, KERN_ERR, "Invalid uid value %d", option);
1022 return 0;
1023
1024 }
1025 sbi->s_resuid = uid;
1026 break;
1027 case Opt_resgid:
1028 if (match_int(&args[0], &option))
1029 return 0;
1030 gid = make_kgid(current_user_ns(), option);
1031 if (!gid_valid(gid)) {
1032 ext3_msg(sb, KERN_ERR, "Invalid gid value %d", option);
1033 return 0;
1034 }
1035 sbi->s_resgid = gid;
1036 break;
1037 case Opt_sb:
1038 /* handled by get_sb_block() instead of here */
1039 /* *sb_block = match_int(&args[0]); */
1040 break;
1041 case Opt_err_panic:
1042 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1043 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1044 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1045 break;
1046 case Opt_err_ro:
1047 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1048 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1049 set_opt (sbi->s_mount_opt, ERRORS_RO);
1050 break;
1051 case Opt_err_cont:
1052 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1053 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1054 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1055 break;
1056 case Opt_nouid32:
1057 set_opt (sbi->s_mount_opt, NO_UID32);
1058 break;
1059 case Opt_nocheck:
1060 clear_opt (sbi->s_mount_opt, CHECK);
1061 break;
1062 case Opt_debug:
1063 set_opt (sbi->s_mount_opt, DEBUG);
1064 break;
1065 case Opt_oldalloc:
1066 ext3_msg(sb, KERN_WARNING,
1067 "Ignoring deprecated oldalloc option");
1068 break;
1069 case Opt_orlov:
1070 ext3_msg(sb, KERN_WARNING,
1071 "Ignoring deprecated orlov option");
1072 break;
1073 #ifdef CONFIG_EXT3_FS_XATTR
1074 case Opt_user_xattr:
1075 set_opt (sbi->s_mount_opt, XATTR_USER);
1076 break;
1077 case Opt_nouser_xattr:
1078 clear_opt (sbi->s_mount_opt, XATTR_USER);
1079 break;
1080 #else
1081 case Opt_user_xattr:
1082 case Opt_nouser_xattr:
1083 ext3_msg(sb, KERN_INFO,
1084 "(no)user_xattr options not supported");
1085 break;
1086 #endif
1087 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1088 case Opt_acl:
1089 set_opt(sbi->s_mount_opt, POSIX_ACL);
1090 break;
1091 case Opt_noacl:
1092 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1093 break;
1094 #else
1095 case Opt_acl:
1096 case Opt_noacl:
1097 ext3_msg(sb, KERN_INFO,
1098 "(no)acl options not supported");
1099 break;
1100 #endif
1101 case Opt_reservation:
1102 set_opt(sbi->s_mount_opt, RESERVATION);
1103 break;
1104 case Opt_noreservation:
1105 clear_opt(sbi->s_mount_opt, RESERVATION);
1106 break;
1107 case Opt_journal_update:
1108 /* @@@ FIXME */
1109 /* Eventually we will want to be able to create
1110 a journal file here. For now, only allow the
1111 user to specify an existing inode to be the
1112 journal file. */
1113 if (is_remount) {
1114 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1115 "journal on remount");
1116 return 0;
1117 }
1118 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1119 break;
1120 case Opt_journal_inum:
1121 if (is_remount) {
1122 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1123 "journal on remount");
1124 return 0;
1125 }
1126 if (match_int(&args[0], &option))
1127 return 0;
1128 *inum = option;
1129 break;
1130 case Opt_journal_dev:
1131 if (is_remount) {
1132 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1133 "journal on remount");
1134 return 0;
1135 }
1136 if (match_int(&args[0], &option))
1137 return 0;
1138 *journal_devnum = option;
1139 break;
1140 case Opt_journal_path:
1141 if (is_remount) {
1142 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1143 "journal on remount");
1144 return 0;
1145 }
1146
1147 journal_path = match_strdup(&args[0]);
1148 if (!journal_path) {
1149 ext3_msg(sb, KERN_ERR, "error: could not dup "
1150 "journal device string");
1151 return 0;
1152 }
1153
1154 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1155 if (error) {
1156 ext3_msg(sb, KERN_ERR, "error: could not find "
1157 "journal device path: error %d", error);
1158 kfree(journal_path);
1159 return 0;
1160 }
1161
1162 journal_inode = path.dentry->d_inode;
1163 if (!S_ISBLK(journal_inode->i_mode)) {
1164 ext3_msg(sb, KERN_ERR, "error: journal path %s "
1165 "is not a block device", journal_path);
1166 path_put(&path);
1167 kfree(journal_path);
1168 return 0;
1169 }
1170
1171 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1172 path_put(&path);
1173 kfree(journal_path);
1174 break;
1175 case Opt_noload:
1176 set_opt (sbi->s_mount_opt, NOLOAD);
1177 break;
1178 case Opt_commit:
1179 if (match_int(&args[0], &option))
1180 return 0;
1181 if (option < 0)
1182 return 0;
1183 if (option == 0)
1184 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1185 sbi->s_commit_interval = HZ * option;
1186 break;
1187 case Opt_data_journal:
1188 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1189 goto datacheck;
1190 case Opt_data_ordered:
1191 data_opt = EXT3_MOUNT_ORDERED_DATA;
1192 goto datacheck;
1193 case Opt_data_writeback:
1194 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1195 datacheck:
1196 if (is_remount) {
1197 if (test_opt(sb, DATA_FLAGS) == data_opt)
1198 break;
1199 ext3_msg(sb, KERN_ERR,
1200 "error: cannot change "
1201 "data mode on remount. The filesystem "
1202 "is mounted in data=%s mode and you "
1203 "try to remount it in data=%s mode.",
1204 data_mode_string(test_opt(sb,
1205 DATA_FLAGS)),
1206 data_mode_string(data_opt));
1207 return 0;
1208 } else {
1209 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1210 sbi->s_mount_opt |= data_opt;
1211 }
1212 break;
1213 case Opt_data_err_abort:
1214 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1215 break;
1216 case Opt_data_err_ignore:
1217 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1218 break;
1219 #ifdef CONFIG_QUOTA
1220 case Opt_usrjquota:
1221 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1222 return 0;
1223 break;
1224 case Opt_grpjquota:
1225 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1226 return 0;
1227 break;
1228 case Opt_offusrjquota:
1229 if (!clear_qf_name(sb, USRQUOTA))
1230 return 0;
1231 break;
1232 case Opt_offgrpjquota:
1233 if (!clear_qf_name(sb, GRPQUOTA))
1234 return 0;
1235 break;
1236 case Opt_jqfmt_vfsold:
1237 qfmt = QFMT_VFS_OLD;
1238 goto set_qf_format;
1239 case Opt_jqfmt_vfsv0:
1240 qfmt = QFMT_VFS_V0;
1241 goto set_qf_format;
1242 case Opt_jqfmt_vfsv1:
1243 qfmt = QFMT_VFS_V1;
1244 set_qf_format:
1245 if (sb_any_quota_loaded(sb) &&
1246 sbi->s_jquota_fmt != qfmt) {
1247 ext3_msg(sb, KERN_ERR, "error: cannot change "
1248 "journaled quota options when "
1249 "quota turned on.");
1250 return 0;
1251 }
1252 sbi->s_jquota_fmt = qfmt;
1253 break;
1254 case Opt_quota:
1255 case Opt_usrquota:
1256 set_opt(sbi->s_mount_opt, QUOTA);
1257 set_opt(sbi->s_mount_opt, USRQUOTA);
1258 break;
1259 case Opt_grpquota:
1260 set_opt(sbi->s_mount_opt, QUOTA);
1261 set_opt(sbi->s_mount_opt, GRPQUOTA);
1262 break;
1263 case Opt_noquota:
1264 if (sb_any_quota_loaded(sb)) {
1265 ext3_msg(sb, KERN_ERR, "error: cannot change "
1266 "quota options when quota turned on.");
1267 return 0;
1268 }
1269 clear_opt(sbi->s_mount_opt, QUOTA);
1270 clear_opt(sbi->s_mount_opt, USRQUOTA);
1271 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1272 break;
1273 #else
1274 case Opt_quota:
1275 case Opt_usrquota:
1276 case Opt_grpquota:
1277 ext3_msg(sb, KERN_ERR,
1278 "error: quota options not supported.");
1279 break;
1280 case Opt_usrjquota:
1281 case Opt_grpjquota:
1282 case Opt_offusrjquota:
1283 case Opt_offgrpjquota:
1284 case Opt_jqfmt_vfsold:
1285 case Opt_jqfmt_vfsv0:
1286 case Opt_jqfmt_vfsv1:
1287 ext3_msg(sb, KERN_ERR,
1288 "error: journaled quota options not "
1289 "supported.");
1290 break;
1291 case Opt_noquota:
1292 break;
1293 #endif
1294 case Opt_abort:
1295 set_opt(sbi->s_mount_opt, ABORT);
1296 break;
1297 case Opt_nobarrier:
1298 clear_opt(sbi->s_mount_opt, BARRIER);
1299 break;
1300 case Opt_barrier:
1301 if (args[0].from) {
1302 if (match_int(&args[0], &option))
1303 return 0;
1304 } else
1305 option = 1; /* No argument, default to 1 */
1306 if (option)
1307 set_opt(sbi->s_mount_opt, BARRIER);
1308 else
1309 clear_opt(sbi->s_mount_opt, BARRIER);
1310 break;
1311 case Opt_ignore:
1312 break;
1313 case Opt_resize:
1314 if (!is_remount) {
1315 ext3_msg(sb, KERN_ERR,
1316 "error: resize option only available "
1317 "for remount");
1318 return 0;
1319 }
1320 if (match_int(&args[0], &option) != 0)
1321 return 0;
1322 *n_blocks_count = option;
1323 break;
1324 case Opt_nobh:
1325 ext3_msg(sb, KERN_WARNING,
1326 "warning: ignoring deprecated nobh option");
1327 break;
1328 case Opt_bh:
1329 ext3_msg(sb, KERN_WARNING,
1330 "warning: ignoring deprecated bh option");
1331 break;
1332 default:
1333 ext3_msg(sb, KERN_ERR,
1334 "error: unrecognized mount option \"%s\" "
1335 "or missing value", p);
1336 return 0;
1337 }
1338 }
1339 #ifdef CONFIG_QUOTA
1340 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1341 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1342 clear_opt(sbi->s_mount_opt, USRQUOTA);
1343 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1344 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1345
1346 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1347 ext3_msg(sb, KERN_ERR, "error: old and new quota "
1348 "format mixing.");
1349 return 0;
1350 }
1351
1352 if (!sbi->s_jquota_fmt) {
1353 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1354 "not specified.");
1355 return 0;
1356 }
1357 }
1358 #endif
1359 return 1;
1360 }
1361
1362 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1363 int read_only)
1364 {
1365 struct ext3_sb_info *sbi = EXT3_SB(sb);
1366 int res = 0;
1367
1368 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1369 ext3_msg(sb, KERN_ERR,
1370 "error: revision level too high, "
1371 "forcing read-only mode");
1372 res = MS_RDONLY;
1373 }
1374 if (read_only)
1375 return res;
1376 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1377 ext3_msg(sb, KERN_WARNING,
1378 "warning: mounting unchecked fs, "
1379 "running e2fsck is recommended");
1380 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1381 ext3_msg(sb, KERN_WARNING,
1382 "warning: mounting fs with errors, "
1383 "running e2fsck is recommended");
1384 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1385 le16_to_cpu(es->s_mnt_count) >=
1386 le16_to_cpu(es->s_max_mnt_count))
1387 ext3_msg(sb, KERN_WARNING,
1388 "warning: maximal mount count reached, "
1389 "running e2fsck is recommended");
1390 else if (le32_to_cpu(es->s_checkinterval) &&
1391 (le32_to_cpu(es->s_lastcheck) +
1392 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1393 ext3_msg(sb, KERN_WARNING,
1394 "warning: checktime reached, "
1395 "running e2fsck is recommended");
1396 #if 0
1397 /* @@@ We _will_ want to clear the valid bit if we find
1398 inconsistencies, to force a fsck at reboot. But for
1399 a plain journaled filesystem we can keep it set as
1400 valid forever! :) */
1401 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1402 #endif
1403 if (!le16_to_cpu(es->s_max_mnt_count))
1404 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1405 le16_add_cpu(&es->s_mnt_count, 1);
1406 es->s_mtime = cpu_to_le32(get_seconds());
1407 ext3_update_dynamic_rev(sb);
1408 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1409
1410 ext3_commit_super(sb, es, 1);
1411 if (test_opt(sb, DEBUG))
1412 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1413 "bpg=%lu, ipg=%lu, mo=%04lx]",
1414 sb->s_blocksize,
1415 sbi->s_groups_count,
1416 EXT3_BLOCKS_PER_GROUP(sb),
1417 EXT3_INODES_PER_GROUP(sb),
1418 sbi->s_mount_opt);
1419
1420 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1421 char b[BDEVNAME_SIZE];
1422 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1423 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1424 } else {
1425 ext3_msg(sb, KERN_INFO, "using internal journal");
1426 }
1427 cleancache_init_fs(sb);
1428 return res;
1429 }
1430
1431 /* Called at mount-time, super-block is locked */
1432 static int ext3_check_descriptors(struct super_block *sb)
1433 {
1434 struct ext3_sb_info *sbi = EXT3_SB(sb);
1435 int i;
1436
1437 ext3_debug ("Checking group descriptors");
1438
1439 for (i = 0; i < sbi->s_groups_count; i++) {
1440 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1441 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1442 ext3_fsblk_t last_block;
1443
1444 if (i == sbi->s_groups_count - 1)
1445 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1446 else
1447 last_block = first_block +
1448 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1449
1450 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1451 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1452 {
1453 ext3_error (sb, "ext3_check_descriptors",
1454 "Block bitmap for group %d"
1455 " not in group (block %lu)!",
1456 i, (unsigned long)
1457 le32_to_cpu(gdp->bg_block_bitmap));
1458 return 0;
1459 }
1460 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1461 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1462 {
1463 ext3_error (sb, "ext3_check_descriptors",
1464 "Inode bitmap for group %d"
1465 " not in group (block %lu)!",
1466 i, (unsigned long)
1467 le32_to_cpu(gdp->bg_inode_bitmap));
1468 return 0;
1469 }
1470 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1471 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1472 last_block)
1473 {
1474 ext3_error (sb, "ext3_check_descriptors",
1475 "Inode table for group %d"
1476 " not in group (block %lu)!",
1477 i, (unsigned long)
1478 le32_to_cpu(gdp->bg_inode_table));
1479 return 0;
1480 }
1481 }
1482
1483 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1484 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1485 return 1;
1486 }
1487
1488
1489 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1490 * the superblock) which were deleted from all directories, but held open by
1491 * a process at the time of a crash. We walk the list and try to delete these
1492 * inodes at recovery time (only with a read-write filesystem).
1493 *
1494 * In order to keep the orphan inode chain consistent during traversal (in
1495 * case of crash during recovery), we link each inode into the superblock
1496 * orphan list_head and handle it the same way as an inode deletion during
1497 * normal operation (which journals the operations for us).
1498 *
1499 * We only do an iget() and an iput() on each inode, which is very safe if we
1500 * accidentally point at an in-use or already deleted inode. The worst that
1501 * can happen in this case is that we get a "bit already cleared" message from
1502 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1503 * e2fsck was run on this filesystem, and it must have already done the orphan
1504 * inode cleanup for us, so we can safely abort without any further action.
1505 */
1506 static void ext3_orphan_cleanup (struct super_block * sb,
1507 struct ext3_super_block * es)
1508 {
1509 unsigned int s_flags = sb->s_flags;
1510 int nr_orphans = 0, nr_truncates = 0;
1511 #ifdef CONFIG_QUOTA
1512 int i;
1513 #endif
1514 if (!es->s_last_orphan) {
1515 jbd_debug(4, "no orphan inodes to clean up\n");
1516 return;
1517 }
1518
1519 if (bdev_read_only(sb->s_bdev)) {
1520 ext3_msg(sb, KERN_ERR, "error: write access "
1521 "unavailable, skipping orphan cleanup.");
1522 return;
1523 }
1524
1525 /* Check if feature set allows readwrite operations */
1526 if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) {
1527 ext3_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
1528 "unknown ROCOMPAT features");
1529 return;
1530 }
1531
1532 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1533 /* don't clear list on RO mount w/ errors */
1534 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
1535 jbd_debug(1, "Errors on filesystem, "
1536 "clearing orphan list.\n");
1537 es->s_last_orphan = 0;
1538 }
1539 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1540 return;
1541 }
1542
1543 if (s_flags & MS_RDONLY) {
1544 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1545 sb->s_flags &= ~MS_RDONLY;
1546 }
1547 #ifdef CONFIG_QUOTA
1548 /* Needed for iput() to work correctly and not trash data */
1549 sb->s_flags |= MS_ACTIVE;
1550 /* Turn on quotas so that they are updated correctly */
1551 for (i = 0; i < EXT3_MAXQUOTAS; i++) {
1552 if (EXT3_SB(sb)->s_qf_names[i]) {
1553 int ret = ext3_quota_on_mount(sb, i);
1554 if (ret < 0)
1555 ext3_msg(sb, KERN_ERR,
1556 "error: cannot turn on journaled "
1557 "quota: %d", ret);
1558 }
1559 }
1560 #endif
1561
1562 while (es->s_last_orphan) {
1563 struct inode *inode;
1564
1565 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1566 if (IS_ERR(inode)) {
1567 es->s_last_orphan = 0;
1568 break;
1569 }
1570
1571 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1572 dquot_initialize(inode);
1573 if (inode->i_nlink) {
1574 printk(KERN_DEBUG
1575 "%s: truncating inode %lu to %Ld bytes\n",
1576 __func__, inode->i_ino, inode->i_size);
1577 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1578 inode->i_ino, inode->i_size);
1579 ext3_truncate(inode);
1580 nr_truncates++;
1581 } else {
1582 printk(KERN_DEBUG
1583 "%s: deleting unreferenced inode %lu\n",
1584 __func__, inode->i_ino);
1585 jbd_debug(2, "deleting unreferenced inode %lu\n",
1586 inode->i_ino);
1587 nr_orphans++;
1588 }
1589 iput(inode); /* The delete magic happens here! */
1590 }
1591
1592 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1593
1594 if (nr_orphans)
1595 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1596 PLURAL(nr_orphans));
1597 if (nr_truncates)
1598 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1599 PLURAL(nr_truncates));
1600 #ifdef CONFIG_QUOTA
1601 /* Turn quotas off */
1602 for (i = 0; i < EXT3_MAXQUOTAS; i++) {
1603 if (sb_dqopt(sb)->files[i])
1604 dquot_quota_off(sb, i);
1605 }
1606 #endif
1607 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1608 }
1609
1610 /*
1611 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1612 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1613 * We need to be 1 filesystem block less than the 2^32 sector limit.
1614 */
1615 static loff_t ext3_max_size(int bits)
1616 {
1617 loff_t res = EXT3_NDIR_BLOCKS;
1618 int meta_blocks;
1619 loff_t upper_limit;
1620
1621 /* This is calculated to be the largest file size for a
1622 * dense, file such that the total number of
1623 * sectors in the file, including data and all indirect blocks,
1624 * does not exceed 2^32 -1
1625 * __u32 i_blocks representing the total number of
1626 * 512 bytes blocks of the file
1627 */
1628 upper_limit = (1LL << 32) - 1;
1629
1630 /* total blocks in file system block size */
1631 upper_limit >>= (bits - 9);
1632
1633
1634 /* indirect blocks */
1635 meta_blocks = 1;
1636 /* double indirect blocks */
1637 meta_blocks += 1 + (1LL << (bits-2));
1638 /* tripple indirect blocks */
1639 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1640
1641 upper_limit -= meta_blocks;
1642 upper_limit <<= bits;
1643
1644 res += 1LL << (bits-2);
1645 res += 1LL << (2*(bits-2));
1646 res += 1LL << (3*(bits-2));
1647 res <<= bits;
1648 if (res > upper_limit)
1649 res = upper_limit;
1650
1651 if (res > MAX_LFS_FILESIZE)
1652 res = MAX_LFS_FILESIZE;
1653
1654 return res;
1655 }
1656
1657 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1658 ext3_fsblk_t logic_sb_block,
1659 int nr)
1660 {
1661 struct ext3_sb_info *sbi = EXT3_SB(sb);
1662 unsigned long bg, first_meta_bg;
1663 int has_super = 0;
1664
1665 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1666
1667 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1668 nr < first_meta_bg)
1669 return (logic_sb_block + nr + 1);
1670 bg = sbi->s_desc_per_block * nr;
1671 if (ext3_bg_has_super(sb, bg))
1672 has_super = 1;
1673 return (has_super + ext3_group_first_block_no(sb, bg));
1674 }
1675
1676
1677 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1678 {
1679 struct buffer_head * bh;
1680 struct ext3_super_block *es = NULL;
1681 struct ext3_sb_info *sbi;
1682 ext3_fsblk_t block;
1683 ext3_fsblk_t sb_block = get_sb_block(&data, sb);
1684 ext3_fsblk_t logic_sb_block;
1685 unsigned long offset = 0;
1686 unsigned int journal_inum = 0;
1687 unsigned long journal_devnum = 0;
1688 unsigned long def_mount_opts;
1689 struct inode *root;
1690 int blocksize;
1691 int hblock;
1692 int db_count;
1693 int i;
1694 int needs_recovery;
1695 int ret = -EINVAL;
1696 __le32 features;
1697 int err;
1698
1699 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1700 if (!sbi)
1701 return -ENOMEM;
1702
1703 sbi->s_blockgroup_lock =
1704 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1705 if (!sbi->s_blockgroup_lock) {
1706 kfree(sbi);
1707 return -ENOMEM;
1708 }
1709 sb->s_fs_info = sbi;
1710 sbi->s_sb_block = sb_block;
1711
1712 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1713 if (!blocksize) {
1714 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1715 goto out_fail;
1716 }
1717
1718 /*
1719 * The ext3 superblock will not be buffer aligned for other than 1kB
1720 * block sizes. We need to calculate the offset from buffer start.
1721 */
1722 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1723 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1724 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1725 } else {
1726 logic_sb_block = sb_block;
1727 }
1728
1729 if (!(bh = sb_bread(sb, logic_sb_block))) {
1730 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1731 goto out_fail;
1732 }
1733 /*
1734 * Note: s_es must be initialized as soon as possible because
1735 * some ext3 macro-instructions depend on its value
1736 */
1737 es = (struct ext3_super_block *) (bh->b_data + offset);
1738 sbi->s_es = es;
1739 sb->s_magic = le16_to_cpu(es->s_magic);
1740 if (sb->s_magic != EXT3_SUPER_MAGIC)
1741 goto cantfind_ext3;
1742
1743 /* Set defaults before we parse the mount options */
1744 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1745 if (def_mount_opts & EXT3_DEFM_DEBUG)
1746 set_opt(sbi->s_mount_opt, DEBUG);
1747 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1748 set_opt(sbi->s_mount_opt, GRPID);
1749 if (def_mount_opts & EXT3_DEFM_UID16)
1750 set_opt(sbi->s_mount_opt, NO_UID32);
1751 #ifdef CONFIG_EXT3_FS_XATTR
1752 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1753 set_opt(sbi->s_mount_opt, XATTR_USER);
1754 #endif
1755 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1756 if (def_mount_opts & EXT3_DEFM_ACL)
1757 set_opt(sbi->s_mount_opt, POSIX_ACL);
1758 #endif
1759 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1760 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1761 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1762 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1763 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1764 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1765
1766 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1767 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1768 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1769 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1770 else
1771 set_opt(sbi->s_mount_opt, ERRORS_RO);
1772
1773 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
1774 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
1775
1776 /* enable barriers by default */
1777 set_opt(sbi->s_mount_opt, BARRIER);
1778 set_opt(sbi->s_mount_opt, RESERVATION);
1779
1780 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1781 NULL, 0))
1782 goto failed_mount;
1783
1784 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1785 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1786
1787 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1788 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1789 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1790 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1791 ext3_msg(sb, KERN_WARNING,
1792 "warning: feature flags set on rev 0 fs, "
1793 "running e2fsck is recommended");
1794 /*
1795 * Check feature flags regardless of the revision level, since we
1796 * previously didn't change the revision level when setting the flags,
1797 * so there is a chance incompat flags are set on a rev 0 filesystem.
1798 */
1799 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1800 if (features) {
1801 ext3_msg(sb, KERN_ERR,
1802 "error: couldn't mount because of unsupported "
1803 "optional features (%x)", le32_to_cpu(features));
1804 goto failed_mount;
1805 }
1806 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1807 if (!(sb->s_flags & MS_RDONLY) && features) {
1808 ext3_msg(sb, KERN_ERR,
1809 "error: couldn't mount RDWR because of unsupported "
1810 "optional features (%x)", le32_to_cpu(features));
1811 goto failed_mount;
1812 }
1813 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1814
1815 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1816 blocksize > EXT3_MAX_BLOCK_SIZE) {
1817 ext3_msg(sb, KERN_ERR,
1818 "error: couldn't mount because of unsupported "
1819 "filesystem blocksize %d", blocksize);
1820 goto failed_mount;
1821 }
1822
1823 hblock = bdev_logical_block_size(sb->s_bdev);
1824 if (sb->s_blocksize != blocksize) {
1825 /*
1826 * Make sure the blocksize for the filesystem is larger
1827 * than the hardware sectorsize for the machine.
1828 */
1829 if (blocksize < hblock) {
1830 ext3_msg(sb, KERN_ERR,
1831 "error: fsblocksize %d too small for "
1832 "hardware sectorsize %d", blocksize, hblock);
1833 goto failed_mount;
1834 }
1835
1836 brelse (bh);
1837 if (!sb_set_blocksize(sb, blocksize)) {
1838 ext3_msg(sb, KERN_ERR,
1839 "error: bad blocksize %d", blocksize);
1840 goto out_fail;
1841 }
1842 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1843 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1844 bh = sb_bread(sb, logic_sb_block);
1845 if (!bh) {
1846 ext3_msg(sb, KERN_ERR,
1847 "error: can't read superblock on 2nd try");
1848 goto failed_mount;
1849 }
1850 es = (struct ext3_super_block *)(bh->b_data + offset);
1851 sbi->s_es = es;
1852 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1853 ext3_msg(sb, KERN_ERR,
1854 "error: magic mismatch");
1855 goto failed_mount;
1856 }
1857 }
1858
1859 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1860
1861 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1862 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1863 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1864 } else {
1865 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1866 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1867 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1868 (!is_power_of_2(sbi->s_inode_size)) ||
1869 (sbi->s_inode_size > blocksize)) {
1870 ext3_msg(sb, KERN_ERR,
1871 "error: unsupported inode size: %d",
1872 sbi->s_inode_size);
1873 goto failed_mount;
1874 }
1875 }
1876 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1877 le32_to_cpu(es->s_log_frag_size);
1878 if (blocksize != sbi->s_frag_size) {
1879 ext3_msg(sb, KERN_ERR,
1880 "error: fragsize %lu != blocksize %u (unsupported)",
1881 sbi->s_frag_size, blocksize);
1882 goto failed_mount;
1883 }
1884 sbi->s_frags_per_block = 1;
1885 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1886 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1887 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1888 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1889 goto cantfind_ext3;
1890 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1891 if (sbi->s_inodes_per_block == 0)
1892 goto cantfind_ext3;
1893 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1894 sbi->s_inodes_per_block;
1895 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1896 sbi->s_sbh = bh;
1897 sbi->s_mount_state = le16_to_cpu(es->s_state);
1898 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1899 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1900 for (i=0; i < 4; i++)
1901 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1902 sbi->s_def_hash_version = es->s_def_hash_version;
1903 i = le32_to_cpu(es->s_flags);
1904 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1905 sbi->s_hash_unsigned = 3;
1906 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1907 #ifdef __CHAR_UNSIGNED__
1908 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1909 sbi->s_hash_unsigned = 3;
1910 #else
1911 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1912 #endif
1913 }
1914
1915 if (sbi->s_blocks_per_group > blocksize * 8) {
1916 ext3_msg(sb, KERN_ERR,
1917 "#blocks per group too big: %lu",
1918 sbi->s_blocks_per_group);
1919 goto failed_mount;
1920 }
1921 if (sbi->s_frags_per_group > blocksize * 8) {
1922 ext3_msg(sb, KERN_ERR,
1923 "error: #fragments per group too big: %lu",
1924 sbi->s_frags_per_group);
1925 goto failed_mount;
1926 }
1927 if (sbi->s_inodes_per_group > blocksize * 8) {
1928 ext3_msg(sb, KERN_ERR,
1929 "error: #inodes per group too big: %lu",
1930 sbi->s_inodes_per_group);
1931 goto failed_mount;
1932 }
1933
1934 err = generic_check_addressable(sb->s_blocksize_bits,
1935 le32_to_cpu(es->s_blocks_count));
1936 if (err) {
1937 ext3_msg(sb, KERN_ERR,
1938 "error: filesystem is too large to mount safely");
1939 if (sizeof(sector_t) < 8)
1940 ext3_msg(sb, KERN_ERR,
1941 "error: CONFIG_LBDAF not enabled");
1942 ret = err;
1943 goto failed_mount;
1944 }
1945
1946 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1947 goto cantfind_ext3;
1948 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1949 le32_to_cpu(es->s_first_data_block) - 1)
1950 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1951 db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
1952 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1953 GFP_KERNEL);
1954 if (sbi->s_group_desc == NULL) {
1955 ext3_msg(sb, KERN_ERR,
1956 "error: not enough memory");
1957 ret = -ENOMEM;
1958 goto failed_mount;
1959 }
1960
1961 bgl_lock_init(sbi->s_blockgroup_lock);
1962
1963 for (i = 0; i < db_count; i++) {
1964 block = descriptor_loc(sb, logic_sb_block, i);
1965 sbi->s_group_desc[i] = sb_bread(sb, block);
1966 if (!sbi->s_group_desc[i]) {
1967 ext3_msg(sb, KERN_ERR,
1968 "error: can't read group descriptor %d", i);
1969 db_count = i;
1970 goto failed_mount2;
1971 }
1972 }
1973 if (!ext3_check_descriptors (sb)) {
1974 ext3_msg(sb, KERN_ERR,
1975 "error: group descriptors corrupted");
1976 goto failed_mount2;
1977 }
1978 sbi->s_gdb_count = db_count;
1979 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1980 spin_lock_init(&sbi->s_next_gen_lock);
1981
1982 /* per fileystem reservation list head & lock */
1983 spin_lock_init(&sbi->s_rsv_window_lock);
1984 sbi->s_rsv_window_root = RB_ROOT;
1985 /* Add a single, static dummy reservation to the start of the
1986 * reservation window list --- it gives us a placeholder for
1987 * append-at-start-of-list which makes the allocation logic
1988 * _much_ simpler. */
1989 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1990 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1991 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1992 sbi->s_rsv_window_head.rsv_goal_size = 0;
1993 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1994
1995 /*
1996 * set up enough so that it can read an inode
1997 */
1998 sb->s_op = &ext3_sops;
1999 sb->s_export_op = &ext3_export_ops;
2000 sb->s_xattr = ext3_xattr_handlers;
2001 #ifdef CONFIG_QUOTA
2002 sb->s_qcop = &ext3_qctl_operations;
2003 sb->dq_op = &ext3_quota_operations;
2004 #endif
2005 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
2006 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2007 mutex_init(&sbi->s_orphan_lock);
2008 mutex_init(&sbi->s_resize_lock);
2009
2010 sb->s_root = NULL;
2011
2012 needs_recovery = (es->s_last_orphan != 0 ||
2013 EXT3_HAS_INCOMPAT_FEATURE(sb,
2014 EXT3_FEATURE_INCOMPAT_RECOVER));
2015
2016 /*
2017 * The first inode we look at is the journal inode. Don't try
2018 * root first: it may be modified in the journal!
2019 */
2020 if (!test_opt(sb, NOLOAD) &&
2021 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
2022 if (ext3_load_journal(sb, es, journal_devnum))
2023 goto failed_mount2;
2024 } else if (journal_inum) {
2025 if (ext3_create_journal(sb, es, journal_inum))
2026 goto failed_mount2;
2027 } else {
2028 if (!silent)
2029 ext3_msg(sb, KERN_ERR,
2030 "error: no journal found. "
2031 "mounting ext3 over ext2?");
2032 goto failed_mount2;
2033 }
2034 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2035 ext3_count_free_blocks(sb), GFP_KERNEL);
2036 if (!err) {
2037 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2038 ext3_count_free_inodes(sb), GFP_KERNEL);
2039 }
2040 if (!err) {
2041 err = percpu_counter_init(&sbi->s_dirs_counter,
2042 ext3_count_dirs(sb), GFP_KERNEL);
2043 }
2044 if (err) {
2045 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
2046 ret = err;
2047 goto failed_mount3;
2048 }
2049
2050 /* We have now updated the journal if required, so we can
2051 * validate the data journaling mode. */
2052 switch (test_opt(sb, DATA_FLAGS)) {
2053 case 0:
2054 /* No mode set, assume a default based on the journal
2055 capabilities: ORDERED_DATA if the journal can
2056 cope, else JOURNAL_DATA */
2057 if (journal_check_available_features
2058 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
2059 set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
2060 else
2061 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2062 break;
2063
2064 case EXT3_MOUNT_ORDERED_DATA:
2065 case EXT3_MOUNT_WRITEBACK_DATA:
2066 if (!journal_check_available_features
2067 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
2068 ext3_msg(sb, KERN_ERR,
2069 "error: journal does not support "
2070 "requested data journaling mode");
2071 goto failed_mount3;
2072 }
2073 default:
2074 break;
2075 }
2076
2077 /*
2078 * The journal_load will have done any necessary log recovery,
2079 * so we can safely mount the rest of the filesystem now.
2080 */
2081
2082 root = ext3_iget(sb, EXT3_ROOT_INO);
2083 if (IS_ERR(root)) {
2084 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
2085 ret = PTR_ERR(root);
2086 goto failed_mount3;
2087 }
2088 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2089 iput(root);
2090 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
2091 goto failed_mount3;
2092 }
2093 sb->s_root = d_make_root(root);
2094 if (!sb->s_root) {
2095 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
2096 ret = -ENOMEM;
2097 goto failed_mount3;
2098 }
2099
2100 if (ext3_setup_super(sb, es, sb->s_flags & MS_RDONLY))
2101 sb->s_flags |= MS_RDONLY;
2102
2103 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2104 ext3_orphan_cleanup(sb, es);
2105 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2106 if (needs_recovery) {
2107 ext3_mark_recovery_complete(sb, es);
2108 ext3_msg(sb, KERN_INFO, "recovery complete");
2109 }
2110 ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
2111 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2112 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2113 "writeback");
2114
2115 return 0;
2116
2117 cantfind_ext3:
2118 if (!silent)
2119 ext3_msg(sb, KERN_INFO,
2120 "error: can't find ext3 filesystem on dev %s.",
2121 sb->s_id);
2122 goto failed_mount;
2123
2124 failed_mount3:
2125 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2126 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2127 percpu_counter_destroy(&sbi->s_dirs_counter);
2128 journal_destroy(sbi->s_journal);
2129 failed_mount2:
2130 for (i = 0; i < db_count; i++)
2131 brelse(sbi->s_group_desc[i]);
2132 kfree(sbi->s_group_desc);
2133 failed_mount:
2134 #ifdef CONFIG_QUOTA
2135 for (i = 0; i < EXT3_MAXQUOTAS; i++)
2136 kfree(sbi->s_qf_names[i]);
2137 #endif
2138 ext3_blkdev_remove(sbi);
2139 brelse(bh);
2140 out_fail:
2141 sb->s_fs_info = NULL;
2142 kfree(sbi->s_blockgroup_lock);
2143 kfree(sbi);
2144 return ret;
2145 }
2146
2147 /*
2148 * Setup any per-fs journal parameters now. We'll do this both on
2149 * initial mount, once the journal has been initialised but before we've
2150 * done any recovery; and again on any subsequent remount.
2151 */
2152 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2153 {
2154 struct ext3_sb_info *sbi = EXT3_SB(sb);
2155
2156 if (sbi->s_commit_interval)
2157 journal->j_commit_interval = sbi->s_commit_interval;
2158 /* We could also set up an ext3-specific default for the commit
2159 * interval here, but for now we'll just fall back to the jbd
2160 * default. */
2161
2162 spin_lock(&journal->j_state_lock);
2163 if (test_opt(sb, BARRIER))
2164 journal->j_flags |= JFS_BARRIER;
2165 else
2166 journal->j_flags &= ~JFS_BARRIER;
2167 if (test_opt(sb, DATA_ERR_ABORT))
2168 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2169 else
2170 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2171 spin_unlock(&journal->j_state_lock);
2172 }
2173
2174 static journal_t *ext3_get_journal(struct super_block *sb,
2175 unsigned int journal_inum)
2176 {
2177 struct inode *journal_inode;
2178 journal_t *journal;
2179
2180 /* First, test for the existence of a valid inode on disk. Bad
2181 * things happen if we iget() an unused inode, as the subsequent
2182 * iput() will try to delete it. */
2183
2184 journal_inode = ext3_iget(sb, journal_inum);
2185 if (IS_ERR(journal_inode)) {
2186 ext3_msg(sb, KERN_ERR, "error: no journal found");
2187 return NULL;
2188 }
2189 if (!journal_inode->i_nlink) {
2190 make_bad_inode(journal_inode);
2191 iput(journal_inode);
2192 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
2193 return NULL;
2194 }
2195
2196 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2197 journal_inode, journal_inode->i_size);
2198 if (!S_ISREG(journal_inode->i_mode)) {
2199 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
2200 iput(journal_inode);
2201 return NULL;
2202 }
2203
2204 journal = journal_init_inode(journal_inode);
2205 if (!journal) {
2206 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
2207 iput(journal_inode);
2208 return NULL;
2209 }
2210 journal->j_private = sb;
2211 ext3_init_journal_params(sb, journal);
2212 return journal;
2213 }
2214
2215 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2216 dev_t j_dev)
2217 {
2218 struct buffer_head * bh;
2219 journal_t *journal;
2220 ext3_fsblk_t start;
2221 ext3_fsblk_t len;
2222 int hblock, blocksize;
2223 ext3_fsblk_t sb_block;
2224 unsigned long offset;
2225 struct ext3_super_block * es;
2226 struct block_device *bdev;
2227
2228 bdev = ext3_blkdev_get(j_dev, sb);
2229 if (bdev == NULL)
2230 return NULL;
2231
2232 blocksize = sb->s_blocksize;
2233 hblock = bdev_logical_block_size(bdev);
2234 if (blocksize < hblock) {
2235 ext3_msg(sb, KERN_ERR,
2236 "error: blocksize too small for journal device");
2237 goto out_bdev;
2238 }
2239
2240 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2241 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2242 set_blocksize(bdev, blocksize);
2243 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2244 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2245 "external journal");
2246 goto out_bdev;
2247 }
2248
2249 es = (struct ext3_super_block *) (bh->b_data + offset);
2250 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2251 !(le32_to_cpu(es->s_feature_incompat) &
2252 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2253 ext3_msg(sb, KERN_ERR, "error: external journal has "
2254 "bad superblock");
2255 brelse(bh);
2256 goto out_bdev;
2257 }
2258
2259 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2260 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
2261 brelse(bh);
2262 goto out_bdev;
2263 }
2264
2265 len = le32_to_cpu(es->s_blocks_count);
2266 start = sb_block + 1;
2267 brelse(bh); /* we're done with the superblock */
2268
2269 journal = journal_init_dev(bdev, sb->s_bdev,
2270 start, len, blocksize);
2271 if (!journal) {
2272 ext3_msg(sb, KERN_ERR,
2273 "error: failed to create device journal");
2274 goto out_bdev;
2275 }
2276 journal->j_private = sb;
2277 if (!bh_uptodate_or_lock(journal->j_sb_buffer)) {
2278 if (bh_submit_read(journal->j_sb_buffer)) {
2279 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2280 goto out_journal;
2281 }
2282 }
2283 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2284 ext3_msg(sb, KERN_ERR,
2285 "error: external journal has more than one "
2286 "user (unsupported) - %d",
2287 be32_to_cpu(journal->j_superblock->s_nr_users));
2288 goto out_journal;
2289 }
2290 EXT3_SB(sb)->journal_bdev = bdev;
2291 ext3_init_journal_params(sb, journal);
2292 return journal;
2293 out_journal:
2294 journal_destroy(journal);
2295 out_bdev:
2296 ext3_blkdev_put(bdev);
2297 return NULL;
2298 }
2299
2300 static int ext3_load_journal(struct super_block *sb,
2301 struct ext3_super_block *es,
2302 unsigned long journal_devnum)
2303 {
2304 journal_t *journal;
2305 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2306 dev_t journal_dev;
2307 int err = 0;
2308 int really_read_only;
2309
2310 if (journal_devnum &&
2311 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2312 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2313 "numbers have changed");
2314 journal_dev = new_decode_dev(journal_devnum);
2315 } else
2316 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2317
2318 really_read_only = bdev_read_only(sb->s_bdev);
2319
2320 /*
2321 * Are we loading a blank journal or performing recovery after a
2322 * crash? For recovery, we need to check in advance whether we
2323 * can get read-write access to the device.
2324 */
2325
2326 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2327 if (sb->s_flags & MS_RDONLY) {
2328 ext3_msg(sb, KERN_INFO,
2329 "recovery required on readonly filesystem");
2330 if (really_read_only) {
2331 ext3_msg(sb, KERN_ERR, "error: write access "
2332 "unavailable, cannot proceed");
2333 return -EROFS;
2334 }
2335 ext3_msg(sb, KERN_INFO,
2336 "write access will be enabled during recovery");
2337 }
2338 }
2339
2340 if (journal_inum && journal_dev) {
2341 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2342 "and inode journals");
2343 return -EINVAL;
2344 }
2345
2346 if (journal_inum) {
2347 if (!(journal = ext3_get_journal(sb, journal_inum)))
2348 return -EINVAL;
2349 } else {
2350 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2351 return -EINVAL;
2352 }
2353
2354 if (!(journal->j_flags & JFS_BARRIER))
2355 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2356
2357 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2358 err = journal_update_format(journal);
2359 if (err) {
2360 ext3_msg(sb, KERN_ERR, "error updating journal");
2361 journal_destroy(journal);
2362 return err;
2363 }
2364 }
2365
2366 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2367 err = journal_wipe(journal, !really_read_only);
2368 if (!err)
2369 err = journal_load(journal);
2370
2371 if (err) {
2372 ext3_msg(sb, KERN_ERR, "error loading journal");
2373 journal_destroy(journal);
2374 return err;
2375 }
2376
2377 EXT3_SB(sb)->s_journal = journal;
2378 ext3_clear_journal_err(sb, es);
2379
2380 if (!really_read_only && journal_devnum &&
2381 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2382 es->s_journal_dev = cpu_to_le32(journal_devnum);
2383
2384 /* Make sure we flush the recovery flag to disk. */
2385 ext3_commit_super(sb, es, 1);
2386 }
2387
2388 return 0;
2389 }
2390
2391 static int ext3_create_journal(struct super_block *sb,
2392 struct ext3_super_block *es,
2393 unsigned int journal_inum)
2394 {
2395 journal_t *journal;
2396 int err;
2397
2398 if (sb->s_flags & MS_RDONLY) {
2399 ext3_msg(sb, KERN_ERR,
2400 "error: readonly filesystem when trying to "
2401 "create journal");
2402 return -EROFS;
2403 }
2404
2405 journal = ext3_get_journal(sb, journal_inum);
2406 if (!journal)
2407 return -EINVAL;
2408
2409 ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
2410 journal_inum);
2411
2412 err = journal_create(journal);
2413 if (err) {
2414 ext3_msg(sb, KERN_ERR, "error creating journal");
2415 journal_destroy(journal);
2416 return -EIO;
2417 }
2418
2419 EXT3_SB(sb)->s_journal = journal;
2420
2421 ext3_update_dynamic_rev(sb);
2422 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2423 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2424
2425 es->s_journal_inum = cpu_to_le32(journal_inum);
2426
2427 /* Make sure we flush the recovery flag to disk. */
2428 ext3_commit_super(sb, es, 1);
2429
2430 return 0;
2431 }
2432
2433 static int ext3_commit_super(struct super_block *sb,
2434 struct ext3_super_block *es,
2435 int sync)
2436 {
2437 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2438 int error = 0;
2439
2440 if (!sbh)
2441 return error;
2442
2443 if (buffer_write_io_error(sbh)) {
2444 /*
2445 * Oh, dear. A previous attempt to write the
2446 * superblock failed. This could happen because the
2447 * USB device was yanked out. Or it could happen to
2448 * be a transient write error and maybe the block will
2449 * be remapped. Nothing we can do but to retry the
2450 * write and hope for the best.
2451 */
2452 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2453 "superblock detected");
2454 clear_buffer_write_io_error(sbh);
2455 set_buffer_uptodate(sbh);
2456 }
2457 /*
2458 * If the file system is mounted read-only, don't update the
2459 * superblock write time. This avoids updating the superblock
2460 * write time when we are mounting the root file system
2461 * read/only but we need to replay the journal; at that point,
2462 * for people who are east of GMT and who make their clock
2463 * tick in localtime for Windows bug-for-bug compatibility,
2464 * the clock is set in the future, and this will cause e2fsck
2465 * to complain and force a full file system check.
2466 */
2467 if (!(sb->s_flags & MS_RDONLY))
2468 es->s_wtime = cpu_to_le32(get_seconds());
2469 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2470 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2471 BUFFER_TRACE(sbh, "marking dirty");
2472 mark_buffer_dirty(sbh);
2473 if (sync) {
2474 error = sync_dirty_buffer(sbh);
2475 if (buffer_write_io_error(sbh)) {
2476 ext3_msg(sb, KERN_ERR, "I/O error while writing "
2477 "superblock");
2478 clear_buffer_write_io_error(sbh);
2479 set_buffer_uptodate(sbh);
2480 }
2481 }
2482 return error;
2483 }
2484
2485
2486 /*
2487 * Have we just finished recovery? If so, and if we are mounting (or
2488 * remounting) the filesystem readonly, then we will end up with a
2489 * consistent fs on disk. Record that fact.
2490 */
2491 static void ext3_mark_recovery_complete(struct super_block * sb,
2492 struct ext3_super_block * es)
2493 {
2494 journal_t *journal = EXT3_SB(sb)->s_journal;
2495
2496 journal_lock_updates(journal);
2497 if (journal_flush(journal) < 0)
2498 goto out;
2499
2500 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2501 sb->s_flags & MS_RDONLY) {
2502 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2503 ext3_commit_super(sb, es, 1);
2504 }
2505
2506 out:
2507 journal_unlock_updates(journal);
2508 }
2509
2510 /*
2511 * If we are mounting (or read-write remounting) a filesystem whose journal
2512 * has recorded an error from a previous lifetime, move that error to the
2513 * main filesystem now.
2514 */
2515 static void ext3_clear_journal_err(struct super_block *sb,
2516 struct ext3_super_block *es)
2517 {
2518 journal_t *journal;
2519 int j_errno;
2520 const char *errstr;
2521
2522 journal = EXT3_SB(sb)->s_journal;
2523
2524 /*
2525 * Now check for any error status which may have been recorded in the
2526 * journal by a prior ext3_error() or ext3_abort()
2527 */
2528
2529 j_errno = journal_errno(journal);
2530 if (j_errno) {
2531 char nbuf[16];
2532
2533 errstr = ext3_decode_error(sb, j_errno, nbuf);
2534 ext3_warning(sb, __func__, "Filesystem error recorded "
2535 "from previous mount: %s", errstr);
2536 ext3_warning(sb, __func__, "Marking fs in need of "
2537 "filesystem check.");
2538
2539 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2540 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2541 ext3_commit_super (sb, es, 1);
2542
2543 journal_clear_err(journal);
2544 }
2545 }
2546
2547 /*
2548 * Force the running and committing transactions to commit,
2549 * and wait on the commit.
2550 */
2551 int ext3_force_commit(struct super_block *sb)
2552 {
2553 journal_t *journal;
2554 int ret;
2555
2556 if (sb->s_flags & MS_RDONLY)
2557 return 0;
2558
2559 journal = EXT3_SB(sb)->s_journal;
2560 ret = ext3_journal_force_commit(journal);
2561 return ret;
2562 }
2563
2564 static int ext3_sync_fs(struct super_block *sb, int wait)
2565 {
2566 tid_t target;
2567
2568 trace_ext3_sync_fs(sb, wait);
2569 /*
2570 * Writeback quota in non-journalled quota case - journalled quota has
2571 * no dirty dquots
2572 */
2573 dquot_writeback_dquots(sb, -1);
2574 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2575 if (wait)
2576 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2577 }
2578 return 0;
2579 }
2580
2581 /*
2582 * LVM calls this function before a (read-only) snapshot is created. This
2583 * gives us a chance to flush the journal completely and mark the fs clean.
2584 */
2585 static int ext3_freeze(struct super_block *sb)
2586 {
2587 int error = 0;
2588 journal_t *journal;
2589
2590 if (!(sb->s_flags & MS_RDONLY)) {
2591 journal = EXT3_SB(sb)->s_journal;
2592
2593 /* Now we set up the journal barrier. */
2594 journal_lock_updates(journal);
2595
2596 /*
2597 * We don't want to clear needs_recovery flag when we failed
2598 * to flush the journal.
2599 */
2600 error = journal_flush(journal);
2601 if (error < 0)
2602 goto out;
2603
2604 /* Journal blocked and flushed, clear needs_recovery flag. */
2605 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2606 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2607 if (error)
2608 goto out;
2609 }
2610 return 0;
2611
2612 out:
2613 journal_unlock_updates(journal);
2614 return error;
2615 }
2616
2617 /*
2618 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2619 * flag here, even though the filesystem is not technically dirty yet.
2620 */
2621 static int ext3_unfreeze(struct super_block *sb)
2622 {
2623 if (!(sb->s_flags & MS_RDONLY)) {
2624 /* Reser the needs_recovery flag before the fs is unlocked. */
2625 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2626 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2627 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2628 }
2629 return 0;
2630 }
2631
2632 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2633 {
2634 struct ext3_super_block * es;
2635 struct ext3_sb_info *sbi = EXT3_SB(sb);
2636 ext3_fsblk_t n_blocks_count = 0;
2637 unsigned long old_sb_flags;
2638 struct ext3_mount_options old_opts;
2639 int enable_quota = 0;
2640 int err;
2641 #ifdef CONFIG_QUOTA
2642 int i;
2643 #endif
2644
2645 sync_filesystem(sb);
2646
2647 /* Store the original options */
2648 old_sb_flags = sb->s_flags;
2649 old_opts.s_mount_opt = sbi->s_mount_opt;
2650 old_opts.s_resuid = sbi->s_resuid;
2651 old_opts.s_resgid = sbi->s_resgid;
2652 old_opts.s_commit_interval = sbi->s_commit_interval;
2653 #ifdef CONFIG_QUOTA
2654 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2655 for (i = 0; i < EXT3_MAXQUOTAS; i++)
2656 if (sbi->s_qf_names[i]) {
2657 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
2658 GFP_KERNEL);
2659 if (!old_opts.s_qf_names[i]) {
2660 int j;
2661
2662 for (j = 0; j < i; j++)
2663 kfree(old_opts.s_qf_names[j]);
2664 return -ENOMEM;
2665 }
2666 } else
2667 old_opts.s_qf_names[i] = NULL;
2668 #endif
2669
2670 /*
2671 * Allow the "check" option to be passed as a remount option.
2672 */
2673 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2674 err = -EINVAL;
2675 goto restore_opts;
2676 }
2677
2678 if (test_opt(sb, ABORT))
2679 ext3_abort(sb, __func__, "Abort forced by user");
2680
2681 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2682 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2683
2684 es = sbi->s_es;
2685
2686 ext3_init_journal_params(sb, sbi->s_journal);
2687
2688 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2689 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2690 if (test_opt(sb, ABORT)) {
2691 err = -EROFS;
2692 goto restore_opts;
2693 }
2694
2695 if (*flags & MS_RDONLY) {
2696 err = dquot_suspend(sb, -1);
2697 if (err < 0)
2698 goto restore_opts;
2699
2700 /*
2701 * First of all, the unconditional stuff we have to do
2702 * to disable replay of the journal when we next remount
2703 */
2704 sb->s_flags |= MS_RDONLY;
2705
2706 /*
2707 * OK, test if we are remounting a valid rw partition
2708 * readonly, and if so set the rdonly flag and then
2709 * mark the partition as valid again.
2710 */
2711 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2712 (sbi->s_mount_state & EXT3_VALID_FS))
2713 es->s_state = cpu_to_le16(sbi->s_mount_state);
2714
2715 ext3_mark_recovery_complete(sb, es);
2716 } else {
2717 __le32 ret;
2718 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2719 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2720 ext3_msg(sb, KERN_WARNING,
2721 "warning: couldn't remount RDWR "
2722 "because of unsupported optional "
2723 "features (%x)", le32_to_cpu(ret));
2724 err = -EROFS;
2725 goto restore_opts;
2726 }
2727
2728 /*
2729 * If we have an unprocessed orphan list hanging
2730 * around from a previously readonly bdev mount,
2731 * require a full umount & mount for now.
2732 */
2733 if (es->s_last_orphan) {
2734 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
2735 "remount RDWR because of unprocessed "
2736 "orphan inode list. Please "
2737 "umount & mount instead.");
2738 err = -EINVAL;
2739 goto restore_opts;
2740 }
2741
2742 /*
2743 * Mounting a RDONLY partition read-write, so reread
2744 * and store the current valid flag. (It may have
2745 * been changed by e2fsck since we originally mounted
2746 * the partition.)
2747 */
2748 ext3_clear_journal_err(sb, es);
2749 sbi->s_mount_state = le16_to_cpu(es->s_state);
2750 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2751 goto restore_opts;
2752 if (!ext3_setup_super (sb, es, 0))
2753 sb->s_flags &= ~MS_RDONLY;
2754 enable_quota = 1;
2755 }
2756 }
2757 #ifdef CONFIG_QUOTA
2758 /* Release old quota file names */
2759 for (i = 0; i < EXT3_MAXQUOTAS; i++)
2760 kfree(old_opts.s_qf_names[i]);
2761 #endif
2762 if (enable_quota)
2763 dquot_resume(sb, -1);
2764 return 0;
2765 restore_opts:
2766 sb->s_flags = old_sb_flags;
2767 sbi->s_mount_opt = old_opts.s_mount_opt;
2768 sbi->s_resuid = old_opts.s_resuid;
2769 sbi->s_resgid = old_opts.s_resgid;
2770 sbi->s_commit_interval = old_opts.s_commit_interval;
2771 #ifdef CONFIG_QUOTA
2772 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2773 for (i = 0; i < EXT3_MAXQUOTAS; i++) {
2774 kfree(sbi->s_qf_names[i]);
2775 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2776 }
2777 #endif
2778 return err;
2779 }
2780
2781 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2782 {
2783 struct super_block *sb = dentry->d_sb;
2784 struct ext3_sb_info *sbi = EXT3_SB(sb);
2785 struct ext3_super_block *es = sbi->s_es;
2786 u64 fsid;
2787
2788 if (test_opt(sb, MINIX_DF)) {
2789 sbi->s_overhead_last = 0;
2790 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2791 unsigned long ngroups = sbi->s_groups_count, i;
2792 ext3_fsblk_t overhead = 0;
2793 smp_rmb();
2794
2795 /*
2796 * Compute the overhead (FS structures). This is constant
2797 * for a given filesystem unless the number of block groups
2798 * changes so we cache the previous value until it does.
2799 */
2800
2801 /*
2802 * All of the blocks before first_data_block are
2803 * overhead
2804 */
2805 overhead = le32_to_cpu(es->s_first_data_block);
2806
2807 /*
2808 * Add the overhead attributed to the superblock and
2809 * block group descriptors. If the sparse superblocks
2810 * feature is turned on, then not all groups have this.
2811 */
2812 for (i = 0; i < ngroups; i++) {
2813 overhead += ext3_bg_has_super(sb, i) +
2814 ext3_bg_num_gdb(sb, i);
2815 cond_resched();
2816 }
2817
2818 /*
2819 * Every block group has an inode bitmap, a block
2820 * bitmap, and an inode table.
2821 */
2822 overhead += ngroups * (2 + sbi->s_itb_per_group);
2823
2824 /* Add the internal journal blocks as well */
2825 if (sbi->s_journal && !sbi->journal_bdev)
2826 overhead += sbi->s_journal->j_maxlen;
2827
2828 sbi->s_overhead_last = overhead;
2829 smp_wmb();
2830 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2831 }
2832
2833 buf->f_type = EXT3_SUPER_MAGIC;
2834 buf->f_bsize = sb->s_blocksize;
2835 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2836 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2837 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2838 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2839 buf->f_bavail = 0;
2840 buf->f_files = le32_to_cpu(es->s_inodes_count);
2841 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2842 buf->f_namelen = EXT3_NAME_LEN;
2843 fsid = le64_to_cpup((void *)es->s_uuid) ^
2844 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2845 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2846 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2847 return 0;
2848 }
2849
2850 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2851 * is locked for write. Otherwise the are possible deadlocks:
2852 * Process 1 Process 2
2853 * ext3_create() quota_sync()
2854 * journal_start() write_dquot()
2855 * dquot_initialize() down(dqio_mutex)
2856 * down(dqio_mutex) journal_start()
2857 *
2858 */
2859
2860 #ifdef CONFIG_QUOTA
2861
2862 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2863 {
2864 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
2865 }
2866
2867 static int ext3_write_dquot(struct dquot *dquot)
2868 {
2869 int ret, err;
2870 handle_t *handle;
2871 struct inode *inode;
2872
2873 inode = dquot_to_inode(dquot);
2874 handle = ext3_journal_start(inode,
2875 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2876 if (IS_ERR(handle))
2877 return PTR_ERR(handle);
2878 ret = dquot_commit(dquot);
2879 err = ext3_journal_stop(handle);
2880 if (!ret)
2881 ret = err;
2882 return ret;
2883 }
2884
2885 static int ext3_acquire_dquot(struct dquot *dquot)
2886 {
2887 int ret, err;
2888 handle_t *handle;
2889
2890 handle = ext3_journal_start(dquot_to_inode(dquot),
2891 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2892 if (IS_ERR(handle))
2893 return PTR_ERR(handle);
2894 ret = dquot_acquire(dquot);
2895 err = ext3_journal_stop(handle);
2896 if (!ret)
2897 ret = err;
2898 return ret;
2899 }
2900
2901 static int ext3_release_dquot(struct dquot *dquot)
2902 {
2903 int ret, err;
2904 handle_t *handle;
2905
2906 handle = ext3_journal_start(dquot_to_inode(dquot),
2907 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2908 if (IS_ERR(handle)) {
2909 /* Release dquot anyway to avoid endless cycle in dqput() */
2910 dquot_release(dquot);
2911 return PTR_ERR(handle);
2912 }
2913 ret = dquot_release(dquot);
2914 err = ext3_journal_stop(handle);
2915 if (!ret)
2916 ret = err;
2917 return ret;
2918 }
2919
2920 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2921 {
2922 /* Are we journaling quotas? */
2923 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2924 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2925 dquot_mark_dquot_dirty(dquot);
2926 return ext3_write_dquot(dquot);
2927 } else {
2928 return dquot_mark_dquot_dirty(dquot);
2929 }
2930 }
2931
2932 static int ext3_write_info(struct super_block *sb, int type)
2933 {
2934 int ret, err;
2935 handle_t *handle;
2936
2937 /* Data block + inode block */
2938 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2939 if (IS_ERR(handle))
2940 return PTR_ERR(handle);
2941 ret = dquot_commit_info(sb, type);
2942 err = ext3_journal_stop(handle);
2943 if (!ret)
2944 ret = err;
2945 return ret;
2946 }
2947
2948 /*
2949 * Turn on quotas during mount time - we need to find
2950 * the quota file and such...
2951 */
2952 static int ext3_quota_on_mount(struct super_block *sb, int type)
2953 {
2954 return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2955 EXT3_SB(sb)->s_jquota_fmt, type);
2956 }
2957
2958 /*
2959 * Standard function to be called on quota_on
2960 */
2961 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2962 struct path *path)
2963 {
2964 int err;
2965
2966 if (!test_opt(sb, QUOTA))
2967 return -EINVAL;
2968
2969 /* Quotafile not on the same filesystem? */
2970 if (path->dentry->d_sb != sb)
2971 return -EXDEV;
2972 /* Journaling quota? */
2973 if (EXT3_SB(sb)->s_qf_names[type]) {
2974 /* Quotafile not of fs root? */
2975 if (path->dentry->d_parent != sb->s_root)
2976 ext3_msg(sb, KERN_WARNING,
2977 "warning: Quota file not on filesystem root. "
2978 "Journaled quota will not work.");
2979 }
2980
2981 /*
2982 * When we journal data on quota file, we have to flush journal to see
2983 * all updates to the file when we bypass pagecache...
2984 */
2985 if (ext3_should_journal_data(path->dentry->d_inode)) {
2986 /*
2987 * We don't need to lock updates but journal_flush() could
2988 * otherwise be livelocked...
2989 */
2990 journal_lock_updates(EXT3_SB(sb)->s_journal);
2991 err = journal_flush(EXT3_SB(sb)->s_journal);
2992 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2993 if (err)
2994 return err;
2995 }
2996
2997 return dquot_quota_on(sb, type, format_id, path);
2998 }
2999
3000 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3001 * acquiring the locks... As quota files are never truncated and quota code
3002 * itself serializes the operations (and no one else should touch the files)
3003 * we don't have to be afraid of races */
3004 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
3005 size_t len, loff_t off)
3006 {
3007 struct inode *inode = sb_dqopt(sb)->files[type];
3008 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
3009 int err = 0;
3010 int offset = off & (sb->s_blocksize - 1);
3011 int tocopy;
3012 size_t toread;
3013 struct buffer_head *bh;
3014 loff_t i_size = i_size_read(inode);
3015
3016 if (off > i_size)
3017 return 0;
3018 if (off+len > i_size)
3019 len = i_size-off;
3020 toread = len;
3021 while (toread > 0) {
3022 tocopy = sb->s_blocksize - offset < toread ?
3023 sb->s_blocksize - offset : toread;
3024 bh = ext3_bread(NULL, inode, blk, 0, &err);
3025 if (err)
3026 return err;
3027 if (!bh) /* A hole? */
3028 memset(data, 0, tocopy);
3029 else
3030 memcpy(data, bh->b_data+offset, tocopy);
3031 brelse(bh);
3032 offset = 0;
3033 toread -= tocopy;
3034 data += tocopy;
3035 blk++;
3036 }
3037 return len;
3038 }
3039
3040 /* Write to quotafile (we know the transaction is already started and has
3041 * enough credits) */
3042 static ssize_t ext3_quota_write(struct super_block *sb, int type,
3043 const char *data, size_t len, loff_t off)
3044 {
3045 struct inode *inode = sb_dqopt(sb)->files[type];
3046 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
3047 int err = 0;
3048 int offset = off & (sb->s_blocksize - 1);
3049 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
3050 struct buffer_head *bh;
3051 handle_t *handle = journal_current_handle();
3052
3053 if (!handle) {
3054 ext3_msg(sb, KERN_WARNING,
3055 "warning: quota write (off=%llu, len=%llu)"
3056 " cancelled because transaction is not started.",
3057 (unsigned long long)off, (unsigned long long)len);
3058 return -EIO;
3059 }
3060
3061 /*
3062 * Since we account only one data block in transaction credits,
3063 * then it is impossible to cross a block boundary.
3064 */
3065 if (sb->s_blocksize - offset < len) {
3066 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3067 " cancelled because not block aligned",
3068 (unsigned long long)off, (unsigned long long)len);
3069 return -EIO;
3070 }
3071 bh = ext3_bread(handle, inode, blk, 1, &err);
3072 if (!bh)
3073 goto out;
3074 if (journal_quota) {
3075 err = ext3_journal_get_write_access(handle, bh);
3076 if (err) {
3077 brelse(bh);
3078 goto out;
3079 }
3080 }
3081 lock_buffer(bh);
3082 memcpy(bh->b_data+offset, data, len);
3083 flush_dcache_page(bh->b_page);
3084 unlock_buffer(bh);
3085 if (journal_quota)
3086 err = ext3_journal_dirty_metadata(handle, bh);
3087 else {
3088 /* Always do at least ordered writes for quotas */
3089 err = ext3_journal_dirty_data(handle, bh);
3090 mark_buffer_dirty(bh);
3091 }
3092 brelse(bh);
3093 out:
3094 if (err)
3095 return err;
3096 if (inode->i_size < off + len) {
3097 i_size_write(inode, off + len);
3098 EXT3_I(inode)->i_disksize = inode->i_size;
3099 }
3100 inode->i_version++;
3101 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3102 ext3_mark_inode_dirty(handle, inode);
3103 return len;
3104 }
3105
3106 #endif
3107
3108 static struct dentry *ext3_mount(struct file_system_type *fs_type,
3109 int flags, const char *dev_name, void *data)
3110 {
3111 return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
3112 }
3113
3114 static struct file_system_type ext3_fs_type = {
3115 .owner = THIS_MODULE,
3116 .name = "ext3",
3117 .mount = ext3_mount,
3118 .kill_sb = kill_block_super,
3119 .fs_flags = FS_REQUIRES_DEV,
3120 };
3121 MODULE_ALIAS_FS("ext3");
3122
3123 static int __init init_ext3_fs(void)
3124 {
3125 int err = init_ext3_xattr();
3126 if (err)
3127 return err;
3128 err = init_inodecache();
3129 if (err)
3130 goto out1;
3131 err = register_filesystem(&ext3_fs_type);
3132 if (err)
3133 goto out;
3134 return 0;
3135 out:
3136 destroy_inodecache();
3137 out1:
3138 exit_ext3_xattr();
3139 return err;
3140 }
3141
3142 static void __exit exit_ext3_fs(void)
3143 {
3144 unregister_filesystem(&ext3_fs_type);
3145 destroy_inodecache();
3146 exit_ext3_xattr();
3147 }
3148
3149 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3150 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3151 MODULE_LICENSE("GPL");
3152 module_init(init_ext3_fs)
3153 module_exit(exit_ext3_fs)
Linux kernel - Deliverables
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