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Merge tag 'for-linus-20141215' of git://git.infradead.org/linux-mtd
[mirror_ubuntu-artful-kernel.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 #ifdef CONFIG_QUOTA
489 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
490 #endif
491
492 return &ei->vfs_inode;
493 }
494
495 static int ext3_drop_inode(struct inode *inode)
496 {
497 int drop = generic_drop_inode(inode);
498
499 trace_ext3_drop_inode(inode, drop);
500 return drop;
501 }
502
503 static void ext3_i_callback(struct rcu_head *head)
504 {
505 struct inode *inode = container_of(head, struct inode, i_rcu);
506 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
507 }
508
509 static void ext3_destroy_inode(struct inode *inode)
510 {
511 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
512 printk("EXT3 Inode %p: orphan list check failed!\n",
513 EXT3_I(inode));
514 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
515 EXT3_I(inode), sizeof(struct ext3_inode_info),
516 false);
517 dump_stack();
518 }
519 call_rcu(&inode->i_rcu, ext3_i_callback);
520 }
521
522 static void init_once(void *foo)
523 {
524 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
525
526 INIT_LIST_HEAD(&ei->i_orphan);
527 #ifdef CONFIG_EXT3_FS_XATTR
528 init_rwsem(&ei->xattr_sem);
529 #endif
530 mutex_init(&ei->truncate_mutex);
531 inode_init_once(&ei->vfs_inode);
532 }
533
534 static int __init init_inodecache(void)
535 {
536 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
537 sizeof(struct ext3_inode_info),
538 0, (SLAB_RECLAIM_ACCOUNT|
539 SLAB_MEM_SPREAD),
540 init_once);
541 if (ext3_inode_cachep == NULL)
542 return -ENOMEM;
543 return 0;
544 }
545
546 static void destroy_inodecache(void)
547 {
548 /*
549 * Make sure all delayed rcu free inodes are flushed before we
550 * destroy cache.
551 */
552 rcu_barrier();
553 kmem_cache_destroy(ext3_inode_cachep);
554 }
555
556 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
557 {
558 #if defined(CONFIG_QUOTA)
559 struct ext3_sb_info *sbi = EXT3_SB(sb);
560
561 if (sbi->s_jquota_fmt) {
562 char *fmtname = "";
563
564 switch (sbi->s_jquota_fmt) {
565 case QFMT_VFS_OLD:
566 fmtname = "vfsold";
567 break;
568 case QFMT_VFS_V0:
569 fmtname = "vfsv0";
570 break;
571 case QFMT_VFS_V1:
572 fmtname = "vfsv1";
573 break;
574 }
575 seq_printf(seq, ",jqfmt=%s", fmtname);
576 }
577
578 if (sbi->s_qf_names[USRQUOTA])
579 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
580
581 if (sbi->s_qf_names[GRPQUOTA])
582 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
583
584 if (test_opt(sb, USRQUOTA))
585 seq_puts(seq, ",usrquota");
586
587 if (test_opt(sb, GRPQUOTA))
588 seq_puts(seq, ",grpquota");
589 #endif
590 }
591
592 static char *data_mode_string(unsigned long mode)
593 {
594 switch (mode) {
595 case EXT3_MOUNT_JOURNAL_DATA:
596 return "journal";
597 case EXT3_MOUNT_ORDERED_DATA:
598 return "ordered";
599 case EXT3_MOUNT_WRITEBACK_DATA:
600 return "writeback";
601 }
602 return "unknown";
603 }
604
605 /*
606 * Show an option if
607 * - it's set to a non-default value OR
608 * - if the per-sb default is different from the global default
609 */
610 static int ext3_show_options(struct seq_file *seq, struct dentry *root)
611 {
612 struct super_block *sb = root->d_sb;
613 struct ext3_sb_info *sbi = EXT3_SB(sb);
614 struct ext3_super_block *es = sbi->s_es;
615 unsigned long def_mount_opts;
616
617 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
618
619 if (sbi->s_sb_block != 1)
620 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
621 if (test_opt(sb, MINIX_DF))
622 seq_puts(seq, ",minixdf");
623 if (test_opt(sb, GRPID))
624 seq_puts(seq, ",grpid");
625 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
626 seq_puts(seq, ",nogrpid");
627 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT3_DEF_RESUID)) ||
628 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
629 seq_printf(seq, ",resuid=%u",
630 from_kuid_munged(&init_user_ns, sbi->s_resuid));
631 }
632 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT3_DEF_RESGID)) ||
633 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
634 seq_printf(seq, ",resgid=%u",
635 from_kgid_munged(&init_user_ns, sbi->s_resgid));
636 }
637 if (test_opt(sb, ERRORS_RO)) {
638 int def_errors = le16_to_cpu(es->s_errors);
639
640 if (def_errors == EXT3_ERRORS_PANIC ||
641 def_errors == EXT3_ERRORS_CONTINUE) {
642 seq_puts(seq, ",errors=remount-ro");
643 }
644 }
645 if (test_opt(sb, ERRORS_CONT))
646 seq_puts(seq, ",errors=continue");
647 if (test_opt(sb, ERRORS_PANIC))
648 seq_puts(seq, ",errors=panic");
649 if (test_opt(sb, NO_UID32))
650 seq_puts(seq, ",nouid32");
651 if (test_opt(sb, DEBUG))
652 seq_puts(seq, ",debug");
653 #ifdef CONFIG_EXT3_FS_XATTR
654 if (test_opt(sb, XATTR_USER))
655 seq_puts(seq, ",user_xattr");
656 if (!test_opt(sb, XATTR_USER) &&
657 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
658 seq_puts(seq, ",nouser_xattr");
659 }
660 #endif
661 #ifdef CONFIG_EXT3_FS_POSIX_ACL
662 if (test_opt(sb, POSIX_ACL))
663 seq_puts(seq, ",acl");
664 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
665 seq_puts(seq, ",noacl");
666 #endif
667 if (!test_opt(sb, RESERVATION))
668 seq_puts(seq, ",noreservation");
669 if (sbi->s_commit_interval) {
670 seq_printf(seq, ",commit=%u",
671 (unsigned) (sbi->s_commit_interval / HZ));
672 }
673
674 /*
675 * Always display barrier state so it's clear what the status is.
676 */
677 seq_puts(seq, ",barrier=");
678 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
679 seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
680 if (test_opt(sb, DATA_ERR_ABORT))
681 seq_puts(seq, ",data_err=abort");
682
683 if (test_opt(sb, NOLOAD))
684 seq_puts(seq, ",norecovery");
685
686 ext3_show_quota_options(seq, sb);
687
688 return 0;
689 }
690
691
692 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
693 u64 ino, u32 generation)
694 {
695 struct inode *inode;
696
697 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
698 return ERR_PTR(-ESTALE);
699 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
700 return ERR_PTR(-ESTALE);
701
702 /* iget isn't really right if the inode is currently unallocated!!
703 *
704 * ext3_read_inode will return a bad_inode if the inode had been
705 * deleted, so we should be safe.
706 *
707 * Currently we don't know the generation for parent directory, so
708 * a generation of 0 means "accept any"
709 */
710 inode = ext3_iget(sb, ino);
711 if (IS_ERR(inode))
712 return ERR_CAST(inode);
713 if (generation && inode->i_generation != generation) {
714 iput(inode);
715 return ERR_PTR(-ESTALE);
716 }
717
718 return inode;
719 }
720
721 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
722 int fh_len, int fh_type)
723 {
724 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
725 ext3_nfs_get_inode);
726 }
727
728 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
729 int fh_len, int fh_type)
730 {
731 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
732 ext3_nfs_get_inode);
733 }
734
735 /*
736 * Try to release metadata pages (indirect blocks, directories) which are
737 * mapped via the block device. Since these pages could have journal heads
738 * which would prevent try_to_free_buffers() from freeing them, we must use
739 * jbd layer's try_to_free_buffers() function to release them.
740 */
741 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
742 gfp_t wait)
743 {
744 journal_t *journal = EXT3_SB(sb)->s_journal;
745
746 WARN_ON(PageChecked(page));
747 if (!page_has_buffers(page))
748 return 0;
749 if (journal)
750 return journal_try_to_free_buffers(journal, page,
751 wait & ~__GFP_WAIT);
752 return try_to_free_buffers(page);
753 }
754
755 #ifdef CONFIG_QUOTA
756 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
757 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
758
759 static int ext3_write_dquot(struct dquot *dquot);
760 static int ext3_acquire_dquot(struct dquot *dquot);
761 static int ext3_release_dquot(struct dquot *dquot);
762 static int ext3_mark_dquot_dirty(struct dquot *dquot);
763 static int ext3_write_info(struct super_block *sb, int type);
764 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
765 struct path *path);
766 static int ext3_quota_on_mount(struct super_block *sb, int type);
767 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
768 size_t len, loff_t off);
769 static ssize_t ext3_quota_write(struct super_block *sb, int type,
770 const char *data, size_t len, loff_t off);
771 static struct dquot **ext3_get_dquots(struct inode *inode)
772 {
773 return EXT3_I(inode)->i_dquot;
774 }
775
776 static const struct dquot_operations ext3_quota_operations = {
777 .write_dquot = ext3_write_dquot,
778 .acquire_dquot = ext3_acquire_dquot,
779 .release_dquot = ext3_release_dquot,
780 .mark_dirty = ext3_mark_dquot_dirty,
781 .write_info = ext3_write_info,
782 .alloc_dquot = dquot_alloc,
783 .destroy_dquot = dquot_destroy,
784 };
785
786 static const struct quotactl_ops ext3_qctl_operations = {
787 .quota_on = ext3_quota_on,
788 .quota_off = dquot_quota_off,
789 .quota_sync = dquot_quota_sync,
790 .get_info = dquot_get_dqinfo,
791 .set_info = dquot_set_dqinfo,
792 .get_dqblk = dquot_get_dqblk,
793 .set_dqblk = dquot_set_dqblk
794 };
795 #endif
796
797 static const struct super_operations ext3_sops = {
798 .alloc_inode = ext3_alloc_inode,
799 .destroy_inode = ext3_destroy_inode,
800 .write_inode = ext3_write_inode,
801 .dirty_inode = ext3_dirty_inode,
802 .drop_inode = ext3_drop_inode,
803 .evict_inode = ext3_evict_inode,
804 .put_super = ext3_put_super,
805 .sync_fs = ext3_sync_fs,
806 .freeze_fs = ext3_freeze,
807 .unfreeze_fs = ext3_unfreeze,
808 .statfs = ext3_statfs,
809 .remount_fs = ext3_remount,
810 .show_options = ext3_show_options,
811 #ifdef CONFIG_QUOTA
812 .quota_read = ext3_quota_read,
813 .quota_write = ext3_quota_write,
814 .get_dquots = ext3_get_dquots,
815 #endif
816 .bdev_try_to_free_page = bdev_try_to_free_page,
817 };
818
819 static const struct export_operations ext3_export_ops = {
820 .fh_to_dentry = ext3_fh_to_dentry,
821 .fh_to_parent = ext3_fh_to_parent,
822 .get_parent = ext3_get_parent,
823 };
824
825 enum {
826 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
827 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
828 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
829 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
830 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
831 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
832 Opt_journal_path,
833 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
834 Opt_data_err_abort, Opt_data_err_ignore,
835 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
836 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
837 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
838 Opt_resize, Opt_usrquota, Opt_grpquota
839 };
840
841 static const match_table_t tokens = {
842 {Opt_bsd_df, "bsddf"},
843 {Opt_minix_df, "minixdf"},
844 {Opt_grpid, "grpid"},
845 {Opt_grpid, "bsdgroups"},
846 {Opt_nogrpid, "nogrpid"},
847 {Opt_nogrpid, "sysvgroups"},
848 {Opt_resgid, "resgid=%u"},
849 {Opt_resuid, "resuid=%u"},
850 {Opt_sb, "sb=%u"},
851 {Opt_err_cont, "errors=continue"},
852 {Opt_err_panic, "errors=panic"},
853 {Opt_err_ro, "errors=remount-ro"},
854 {Opt_nouid32, "nouid32"},
855 {Opt_nocheck, "nocheck"},
856 {Opt_nocheck, "check=none"},
857 {Opt_debug, "debug"},
858 {Opt_oldalloc, "oldalloc"},
859 {Opt_orlov, "orlov"},
860 {Opt_user_xattr, "user_xattr"},
861 {Opt_nouser_xattr, "nouser_xattr"},
862 {Opt_acl, "acl"},
863 {Opt_noacl, "noacl"},
864 {Opt_reservation, "reservation"},
865 {Opt_noreservation, "noreservation"},
866 {Opt_noload, "noload"},
867 {Opt_noload, "norecovery"},
868 {Opt_nobh, "nobh"},
869 {Opt_bh, "bh"},
870 {Opt_commit, "commit=%u"},
871 {Opt_journal_update, "journal=update"},
872 {Opt_journal_inum, "journal=%u"},
873 {Opt_journal_dev, "journal_dev=%u"},
874 {Opt_journal_path, "journal_path=%s"},
875 {Opt_abort, "abort"},
876 {Opt_data_journal, "data=journal"},
877 {Opt_data_ordered, "data=ordered"},
878 {Opt_data_writeback, "data=writeback"},
879 {Opt_data_err_abort, "data_err=abort"},
880 {Opt_data_err_ignore, "data_err=ignore"},
881 {Opt_offusrjquota, "usrjquota="},
882 {Opt_usrjquota, "usrjquota=%s"},
883 {Opt_offgrpjquota, "grpjquota="},
884 {Opt_grpjquota, "grpjquota=%s"},
885 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
886 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
887 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
888 {Opt_grpquota, "grpquota"},
889 {Opt_noquota, "noquota"},
890 {Opt_quota, "quota"},
891 {Opt_usrquota, "usrquota"},
892 {Opt_barrier, "barrier=%u"},
893 {Opt_barrier, "barrier"},
894 {Opt_nobarrier, "nobarrier"},
895 {Opt_resize, "resize"},
896 {Opt_err, NULL},
897 };
898
899 static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
900 {
901 ext3_fsblk_t sb_block;
902 char *options = (char *) *data;
903
904 if (!options || strncmp(options, "sb=", 3) != 0)
905 return 1; /* Default location */
906 options += 3;
907 /*todo: use simple_strtoll with >32bit ext3 */
908 sb_block = simple_strtoul(options, &options, 0);
909 if (*options && *options != ',') {
910 ext3_msg(sb, KERN_ERR, "error: invalid sb specification: %s",
911 (char *) *data);
912 return 1;
913 }
914 if (*options == ',')
915 options++;
916 *data = (void *) options;
917 return sb_block;
918 }
919
920 #ifdef CONFIG_QUOTA
921 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
922 {
923 struct ext3_sb_info *sbi = EXT3_SB(sb);
924 char *qname;
925
926 if (sb_any_quota_loaded(sb) &&
927 !sbi->s_qf_names[qtype]) {
928 ext3_msg(sb, KERN_ERR,
929 "Cannot change journaled "
930 "quota options when quota turned on");
931 return 0;
932 }
933 qname = match_strdup(args);
934 if (!qname) {
935 ext3_msg(sb, KERN_ERR,
936 "Not enough memory for storing quotafile name");
937 return 0;
938 }
939 if (sbi->s_qf_names[qtype]) {
940 int same = !strcmp(sbi->s_qf_names[qtype], qname);
941
942 kfree(qname);
943 if (!same) {
944 ext3_msg(sb, KERN_ERR,
945 "%s quota file already specified",
946 QTYPE2NAME(qtype));
947 }
948 return same;
949 }
950 if (strchr(qname, '/')) {
951 ext3_msg(sb, KERN_ERR,
952 "quotafile must be on filesystem root");
953 kfree(qname);
954 return 0;
955 }
956 sbi->s_qf_names[qtype] = qname;
957 set_opt(sbi->s_mount_opt, QUOTA);
958 return 1;
959 }
960
961 static int clear_qf_name(struct super_block *sb, int qtype) {
962
963 struct ext3_sb_info *sbi = EXT3_SB(sb);
964
965 if (sb_any_quota_loaded(sb) &&
966 sbi->s_qf_names[qtype]) {
967 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
968 " when quota turned on");
969 return 0;
970 }
971 if (sbi->s_qf_names[qtype]) {
972 kfree(sbi->s_qf_names[qtype]);
973 sbi->s_qf_names[qtype] = NULL;
974 }
975 return 1;
976 }
977 #endif
978
979 static int parse_options (char *options, struct super_block *sb,
980 unsigned int *inum, unsigned long *journal_devnum,
981 ext3_fsblk_t *n_blocks_count, int is_remount)
982 {
983 struct ext3_sb_info *sbi = EXT3_SB(sb);
984 char * p;
985 substring_t args[MAX_OPT_ARGS];
986 int data_opt = 0;
987 int option;
988 kuid_t uid;
989 kgid_t gid;
990 char *journal_path;
991 struct inode *journal_inode;
992 struct path path;
993 int error;
994
995 #ifdef CONFIG_QUOTA
996 int qfmt;
997 #endif
998
999 if (!options)
1000 return 1;
1001
1002 while ((p = strsep (&options, ",")) != NULL) {
1003 int token;
1004 if (!*p)
1005 continue;
1006 /*
1007 * Initialize args struct so we know whether arg was
1008 * found; some options take optional arguments.
1009 */
1010 args[0].to = args[0].from = NULL;
1011 token = match_token(p, tokens, args);
1012 switch (token) {
1013 case Opt_bsd_df:
1014 clear_opt (sbi->s_mount_opt, MINIX_DF);
1015 break;
1016 case Opt_minix_df:
1017 set_opt (sbi->s_mount_opt, MINIX_DF);
1018 break;
1019 case Opt_grpid:
1020 set_opt (sbi->s_mount_opt, GRPID);
1021 break;
1022 case Opt_nogrpid:
1023 clear_opt (sbi->s_mount_opt, GRPID);
1024 break;
1025 case Opt_resuid:
1026 if (match_int(&args[0], &option))
1027 return 0;
1028 uid = make_kuid(current_user_ns(), option);
1029 if (!uid_valid(uid)) {
1030 ext3_msg(sb, KERN_ERR, "Invalid uid value %d", option);
1031 return 0;
1032
1033 }
1034 sbi->s_resuid = uid;
1035 break;
1036 case Opt_resgid:
1037 if (match_int(&args[0], &option))
1038 return 0;
1039 gid = make_kgid(current_user_ns(), option);
1040 if (!gid_valid(gid)) {
1041 ext3_msg(sb, KERN_ERR, "Invalid gid value %d", option);
1042 return 0;
1043 }
1044 sbi->s_resgid = gid;
1045 break;
1046 case Opt_sb:
1047 /* handled by get_sb_block() instead of here */
1048 /* *sb_block = match_int(&args[0]); */
1049 break;
1050 case Opt_err_panic:
1051 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1052 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1053 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1054 break;
1055 case Opt_err_ro:
1056 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1057 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1058 set_opt (sbi->s_mount_opt, ERRORS_RO);
1059 break;
1060 case Opt_err_cont:
1061 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1062 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1063 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1064 break;
1065 case Opt_nouid32:
1066 set_opt (sbi->s_mount_opt, NO_UID32);
1067 break;
1068 case Opt_nocheck:
1069 clear_opt (sbi->s_mount_opt, CHECK);
1070 break;
1071 case Opt_debug:
1072 set_opt (sbi->s_mount_opt, DEBUG);
1073 break;
1074 case Opt_oldalloc:
1075 ext3_msg(sb, KERN_WARNING,
1076 "Ignoring deprecated oldalloc option");
1077 break;
1078 case Opt_orlov:
1079 ext3_msg(sb, KERN_WARNING,
1080 "Ignoring deprecated orlov option");
1081 break;
1082 #ifdef CONFIG_EXT3_FS_XATTR
1083 case Opt_user_xattr:
1084 set_opt (sbi->s_mount_opt, XATTR_USER);
1085 break;
1086 case Opt_nouser_xattr:
1087 clear_opt (sbi->s_mount_opt, XATTR_USER);
1088 break;
1089 #else
1090 case Opt_user_xattr:
1091 case Opt_nouser_xattr:
1092 ext3_msg(sb, KERN_INFO,
1093 "(no)user_xattr options not supported");
1094 break;
1095 #endif
1096 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1097 case Opt_acl:
1098 set_opt(sbi->s_mount_opt, POSIX_ACL);
1099 break;
1100 case Opt_noacl:
1101 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1102 break;
1103 #else
1104 case Opt_acl:
1105 case Opt_noacl:
1106 ext3_msg(sb, KERN_INFO,
1107 "(no)acl options not supported");
1108 break;
1109 #endif
1110 case Opt_reservation:
1111 set_opt(sbi->s_mount_opt, RESERVATION);
1112 break;
1113 case Opt_noreservation:
1114 clear_opt(sbi->s_mount_opt, RESERVATION);
1115 break;
1116 case Opt_journal_update:
1117 /* @@@ FIXME */
1118 /* Eventually we will want to be able to create
1119 a journal file here. For now, only allow the
1120 user to specify an existing inode to be the
1121 journal file. */
1122 if (is_remount) {
1123 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1124 "journal on remount");
1125 return 0;
1126 }
1127 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1128 break;
1129 case Opt_journal_inum:
1130 if (is_remount) {
1131 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1132 "journal on remount");
1133 return 0;
1134 }
1135 if (match_int(&args[0], &option))
1136 return 0;
1137 *inum = option;
1138 break;
1139 case Opt_journal_dev:
1140 if (is_remount) {
1141 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1142 "journal on remount");
1143 return 0;
1144 }
1145 if (match_int(&args[0], &option))
1146 return 0;
1147 *journal_devnum = option;
1148 break;
1149 case Opt_journal_path:
1150 if (is_remount) {
1151 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1152 "journal on remount");
1153 return 0;
1154 }
1155
1156 journal_path = match_strdup(&args[0]);
1157 if (!journal_path) {
1158 ext3_msg(sb, KERN_ERR, "error: could not dup "
1159 "journal device string");
1160 return 0;
1161 }
1162
1163 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1164 if (error) {
1165 ext3_msg(sb, KERN_ERR, "error: could not find "
1166 "journal device path: error %d", error);
1167 kfree(journal_path);
1168 return 0;
1169 }
1170
1171 journal_inode = path.dentry->d_inode;
1172 if (!S_ISBLK(journal_inode->i_mode)) {
1173 ext3_msg(sb, KERN_ERR, "error: journal path %s "
1174 "is not a block device", journal_path);
1175 path_put(&path);
1176 kfree(journal_path);
1177 return 0;
1178 }
1179
1180 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1181 path_put(&path);
1182 kfree(journal_path);
1183 break;
1184 case Opt_noload:
1185 set_opt (sbi->s_mount_opt, NOLOAD);
1186 break;
1187 case Opt_commit:
1188 if (match_int(&args[0], &option))
1189 return 0;
1190 if (option < 0)
1191 return 0;
1192 if (option == 0)
1193 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1194 sbi->s_commit_interval = HZ * option;
1195 break;
1196 case Opt_data_journal:
1197 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1198 goto datacheck;
1199 case Opt_data_ordered:
1200 data_opt = EXT3_MOUNT_ORDERED_DATA;
1201 goto datacheck;
1202 case Opt_data_writeback:
1203 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1204 datacheck:
1205 if (is_remount) {
1206 if (test_opt(sb, DATA_FLAGS) == data_opt)
1207 break;
1208 ext3_msg(sb, KERN_ERR,
1209 "error: cannot change "
1210 "data mode on remount. The filesystem "
1211 "is mounted in data=%s mode and you "
1212 "try to remount it in data=%s mode.",
1213 data_mode_string(test_opt(sb,
1214 DATA_FLAGS)),
1215 data_mode_string(data_opt));
1216 return 0;
1217 } else {
1218 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1219 sbi->s_mount_opt |= data_opt;
1220 }
1221 break;
1222 case Opt_data_err_abort:
1223 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1224 break;
1225 case Opt_data_err_ignore:
1226 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1227 break;
1228 #ifdef CONFIG_QUOTA
1229 case Opt_usrjquota:
1230 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1231 return 0;
1232 break;
1233 case Opt_grpjquota:
1234 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1235 return 0;
1236 break;
1237 case Opt_offusrjquota:
1238 if (!clear_qf_name(sb, USRQUOTA))
1239 return 0;
1240 break;
1241 case Opt_offgrpjquota:
1242 if (!clear_qf_name(sb, GRPQUOTA))
1243 return 0;
1244 break;
1245 case Opt_jqfmt_vfsold:
1246 qfmt = QFMT_VFS_OLD;
1247 goto set_qf_format;
1248 case Opt_jqfmt_vfsv0:
1249 qfmt = QFMT_VFS_V0;
1250 goto set_qf_format;
1251 case Opt_jqfmt_vfsv1:
1252 qfmt = QFMT_VFS_V1;
1253 set_qf_format:
1254 if (sb_any_quota_loaded(sb) &&
1255 sbi->s_jquota_fmt != qfmt) {
1256 ext3_msg(sb, KERN_ERR, "error: cannot change "
1257 "journaled quota options when "
1258 "quota turned on.");
1259 return 0;
1260 }
1261 sbi->s_jquota_fmt = qfmt;
1262 break;
1263 case Opt_quota:
1264 case Opt_usrquota:
1265 set_opt(sbi->s_mount_opt, QUOTA);
1266 set_opt(sbi->s_mount_opt, USRQUOTA);
1267 break;
1268 case Opt_grpquota:
1269 set_opt(sbi->s_mount_opt, QUOTA);
1270 set_opt(sbi->s_mount_opt, GRPQUOTA);
1271 break;
1272 case Opt_noquota:
1273 if (sb_any_quota_loaded(sb)) {
1274 ext3_msg(sb, KERN_ERR, "error: cannot change "
1275 "quota options when quota turned on.");
1276 return 0;
1277 }
1278 clear_opt(sbi->s_mount_opt, QUOTA);
1279 clear_opt(sbi->s_mount_opt, USRQUOTA);
1280 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1281 break;
1282 #else
1283 case Opt_quota:
1284 case Opt_usrquota:
1285 case Opt_grpquota:
1286 ext3_msg(sb, KERN_ERR,
1287 "error: quota options not supported.");
1288 break;
1289 case Opt_usrjquota:
1290 case Opt_grpjquota:
1291 case Opt_offusrjquota:
1292 case Opt_offgrpjquota:
1293 case Opt_jqfmt_vfsold:
1294 case Opt_jqfmt_vfsv0:
1295 case Opt_jqfmt_vfsv1:
1296 ext3_msg(sb, KERN_ERR,
1297 "error: journaled quota options not "
1298 "supported.");
1299 break;
1300 case Opt_noquota:
1301 break;
1302 #endif
1303 case Opt_abort:
1304 set_opt(sbi->s_mount_opt, ABORT);
1305 break;
1306 case Opt_nobarrier:
1307 clear_opt(sbi->s_mount_opt, BARRIER);
1308 break;
1309 case Opt_barrier:
1310 if (args[0].from) {
1311 if (match_int(&args[0], &option))
1312 return 0;
1313 } else
1314 option = 1; /* No argument, default to 1 */
1315 if (option)
1316 set_opt(sbi->s_mount_opt, BARRIER);
1317 else
1318 clear_opt(sbi->s_mount_opt, BARRIER);
1319 break;
1320 case Opt_ignore:
1321 break;
1322 case Opt_resize:
1323 if (!is_remount) {
1324 ext3_msg(sb, KERN_ERR,
1325 "error: resize option only available "
1326 "for remount");
1327 return 0;
1328 }
1329 if (match_int(&args[0], &option) != 0)
1330 return 0;
1331 *n_blocks_count = option;
1332 break;
1333 case Opt_nobh:
1334 ext3_msg(sb, KERN_WARNING,
1335 "warning: ignoring deprecated nobh option");
1336 break;
1337 case Opt_bh:
1338 ext3_msg(sb, KERN_WARNING,
1339 "warning: ignoring deprecated bh option");
1340 break;
1341 default:
1342 ext3_msg(sb, KERN_ERR,
1343 "error: unrecognized mount option \"%s\" "
1344 "or missing value", p);
1345 return 0;
1346 }
1347 }
1348 #ifdef CONFIG_QUOTA
1349 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1350 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1351 clear_opt(sbi->s_mount_opt, USRQUOTA);
1352 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1353 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1354
1355 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1356 ext3_msg(sb, KERN_ERR, "error: old and new quota "
1357 "format mixing.");
1358 return 0;
1359 }
1360
1361 if (!sbi->s_jquota_fmt) {
1362 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1363 "not specified.");
1364 return 0;
1365 }
1366 }
1367 #endif
1368 return 1;
1369 }
1370
1371 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1372 int read_only)
1373 {
1374 struct ext3_sb_info *sbi = EXT3_SB(sb);
1375 int res = 0;
1376
1377 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1378 ext3_msg(sb, KERN_ERR,
1379 "error: revision level too high, "
1380 "forcing read-only mode");
1381 res = MS_RDONLY;
1382 }
1383 if (read_only)
1384 return res;
1385 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1386 ext3_msg(sb, KERN_WARNING,
1387 "warning: mounting unchecked fs, "
1388 "running e2fsck is recommended");
1389 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1390 ext3_msg(sb, KERN_WARNING,
1391 "warning: mounting fs with errors, "
1392 "running e2fsck is recommended");
1393 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1394 le16_to_cpu(es->s_mnt_count) >=
1395 le16_to_cpu(es->s_max_mnt_count))
1396 ext3_msg(sb, KERN_WARNING,
1397 "warning: maximal mount count reached, "
1398 "running e2fsck is recommended");
1399 else if (le32_to_cpu(es->s_checkinterval) &&
1400 (le32_to_cpu(es->s_lastcheck) +
1401 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1402 ext3_msg(sb, KERN_WARNING,
1403 "warning: checktime reached, "
1404 "running e2fsck is recommended");
1405 #if 0
1406 /* @@@ We _will_ want to clear the valid bit if we find
1407 inconsistencies, to force a fsck at reboot. But for
1408 a plain journaled filesystem we can keep it set as
1409 valid forever! :) */
1410 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1411 #endif
1412 if (!le16_to_cpu(es->s_max_mnt_count))
1413 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1414 le16_add_cpu(&es->s_mnt_count, 1);
1415 es->s_mtime = cpu_to_le32(get_seconds());
1416 ext3_update_dynamic_rev(sb);
1417 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1418
1419 ext3_commit_super(sb, es, 1);
1420 if (test_opt(sb, DEBUG))
1421 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1422 "bpg=%lu, ipg=%lu, mo=%04lx]",
1423 sb->s_blocksize,
1424 sbi->s_groups_count,
1425 EXT3_BLOCKS_PER_GROUP(sb),
1426 EXT3_INODES_PER_GROUP(sb),
1427 sbi->s_mount_opt);
1428
1429 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1430 char b[BDEVNAME_SIZE];
1431 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1432 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1433 } else {
1434 ext3_msg(sb, KERN_INFO, "using internal journal");
1435 }
1436 cleancache_init_fs(sb);
1437 return res;
1438 }
1439
1440 /* Called at mount-time, super-block is locked */
1441 static int ext3_check_descriptors(struct super_block *sb)
1442 {
1443 struct ext3_sb_info *sbi = EXT3_SB(sb);
1444 int i;
1445
1446 ext3_debug ("Checking group descriptors");
1447
1448 for (i = 0; i < sbi->s_groups_count; i++) {
1449 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1450 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1451 ext3_fsblk_t last_block;
1452
1453 if (i == sbi->s_groups_count - 1)
1454 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1455 else
1456 last_block = first_block +
1457 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1458
1459 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1460 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1461 {
1462 ext3_error (sb, "ext3_check_descriptors",
1463 "Block bitmap for group %d"
1464 " not in group (block %lu)!",
1465 i, (unsigned long)
1466 le32_to_cpu(gdp->bg_block_bitmap));
1467 return 0;
1468 }
1469 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1470 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1471 {
1472 ext3_error (sb, "ext3_check_descriptors",
1473 "Inode bitmap for group %d"
1474 " not in group (block %lu)!",
1475 i, (unsigned long)
1476 le32_to_cpu(gdp->bg_inode_bitmap));
1477 return 0;
1478 }
1479 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1480 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1481 last_block)
1482 {
1483 ext3_error (sb, "ext3_check_descriptors",
1484 "Inode table for group %d"
1485 " not in group (block %lu)!",
1486 i, (unsigned long)
1487 le32_to_cpu(gdp->bg_inode_table));
1488 return 0;
1489 }
1490 }
1491
1492 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1493 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1494 return 1;
1495 }
1496
1497
1498 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1499 * the superblock) which were deleted from all directories, but held open by
1500 * a process at the time of a crash. We walk the list and try to delete these
1501 * inodes at recovery time (only with a read-write filesystem).
1502 *
1503 * In order to keep the orphan inode chain consistent during traversal (in
1504 * case of crash during recovery), we link each inode into the superblock
1505 * orphan list_head and handle it the same way as an inode deletion during
1506 * normal operation (which journals the operations for us).
1507 *
1508 * We only do an iget() and an iput() on each inode, which is very safe if we
1509 * accidentally point at an in-use or already deleted inode. The worst that
1510 * can happen in this case is that we get a "bit already cleared" message from
1511 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1512 * e2fsck was run on this filesystem, and it must have already done the orphan
1513 * inode cleanup for us, so we can safely abort without any further action.
1514 */
1515 static void ext3_orphan_cleanup (struct super_block * sb,
1516 struct ext3_super_block * es)
1517 {
1518 unsigned int s_flags = sb->s_flags;
1519 int nr_orphans = 0, nr_truncates = 0;
1520 #ifdef CONFIG_QUOTA
1521 int i;
1522 #endif
1523 if (!es->s_last_orphan) {
1524 jbd_debug(4, "no orphan inodes to clean up\n");
1525 return;
1526 }
1527
1528 if (bdev_read_only(sb->s_bdev)) {
1529 ext3_msg(sb, KERN_ERR, "error: write access "
1530 "unavailable, skipping orphan cleanup.");
1531 return;
1532 }
1533
1534 /* Check if feature set allows readwrite operations */
1535 if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) {
1536 ext3_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
1537 "unknown ROCOMPAT features");
1538 return;
1539 }
1540
1541 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1542 /* don't clear list on RO mount w/ errors */
1543 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
1544 jbd_debug(1, "Errors on filesystem, "
1545 "clearing orphan list.\n");
1546 es->s_last_orphan = 0;
1547 }
1548 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1549 return;
1550 }
1551
1552 if (s_flags & MS_RDONLY) {
1553 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1554 sb->s_flags &= ~MS_RDONLY;
1555 }
1556 #ifdef CONFIG_QUOTA
1557 /* Needed for iput() to work correctly and not trash data */
1558 sb->s_flags |= MS_ACTIVE;
1559 /* Turn on quotas so that they are updated correctly */
1560 for (i = 0; i < EXT3_MAXQUOTAS; i++) {
1561 if (EXT3_SB(sb)->s_qf_names[i]) {
1562 int ret = ext3_quota_on_mount(sb, i);
1563 if (ret < 0)
1564 ext3_msg(sb, KERN_ERR,
1565 "error: cannot turn on journaled "
1566 "quota: %d", ret);
1567 }
1568 }
1569 #endif
1570
1571 while (es->s_last_orphan) {
1572 struct inode *inode;
1573
1574 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1575 if (IS_ERR(inode)) {
1576 es->s_last_orphan = 0;
1577 break;
1578 }
1579
1580 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1581 dquot_initialize(inode);
1582 if (inode->i_nlink) {
1583 printk(KERN_DEBUG
1584 "%s: truncating inode %lu to %Ld bytes\n",
1585 __func__, inode->i_ino, inode->i_size);
1586 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1587 inode->i_ino, inode->i_size);
1588 ext3_truncate(inode);
1589 nr_truncates++;
1590 } else {
1591 printk(KERN_DEBUG
1592 "%s: deleting unreferenced inode %lu\n",
1593 __func__, inode->i_ino);
1594 jbd_debug(2, "deleting unreferenced inode %lu\n",
1595 inode->i_ino);
1596 nr_orphans++;
1597 }
1598 iput(inode); /* The delete magic happens here! */
1599 }
1600
1601 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1602
1603 if (nr_orphans)
1604 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1605 PLURAL(nr_orphans));
1606 if (nr_truncates)
1607 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1608 PLURAL(nr_truncates));
1609 #ifdef CONFIG_QUOTA
1610 /* Turn quotas off */
1611 for (i = 0; i < EXT3_MAXQUOTAS; i++) {
1612 if (sb_dqopt(sb)->files[i])
1613 dquot_quota_off(sb, i);
1614 }
1615 #endif
1616 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1617 }
1618
1619 /*
1620 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1621 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1622 * We need to be 1 filesystem block less than the 2^32 sector limit.
1623 */
1624 static loff_t ext3_max_size(int bits)
1625 {
1626 loff_t res = EXT3_NDIR_BLOCKS;
1627 int meta_blocks;
1628 loff_t upper_limit;
1629
1630 /* This is calculated to be the largest file size for a
1631 * dense, file such that the total number of
1632 * sectors in the file, including data and all indirect blocks,
1633 * does not exceed 2^32 -1
1634 * __u32 i_blocks representing the total number of
1635 * 512 bytes blocks of the file
1636 */
1637 upper_limit = (1LL << 32) - 1;
1638
1639 /* total blocks in file system block size */
1640 upper_limit >>= (bits - 9);
1641
1642
1643 /* indirect blocks */
1644 meta_blocks = 1;
1645 /* double indirect blocks */
1646 meta_blocks += 1 + (1LL << (bits-2));
1647 /* tripple indirect blocks */
1648 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1649
1650 upper_limit -= meta_blocks;
1651 upper_limit <<= bits;
1652
1653 res += 1LL << (bits-2);
1654 res += 1LL << (2*(bits-2));
1655 res += 1LL << (3*(bits-2));
1656 res <<= bits;
1657 if (res > upper_limit)
1658 res = upper_limit;
1659
1660 if (res > MAX_LFS_FILESIZE)
1661 res = MAX_LFS_FILESIZE;
1662
1663 return res;
1664 }
1665
1666 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1667 ext3_fsblk_t logic_sb_block,
1668 int nr)
1669 {
1670 struct ext3_sb_info *sbi = EXT3_SB(sb);
1671 unsigned long bg, first_meta_bg;
1672 int has_super = 0;
1673
1674 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1675
1676 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1677 nr < first_meta_bg)
1678 return (logic_sb_block + nr + 1);
1679 bg = sbi->s_desc_per_block * nr;
1680 if (ext3_bg_has_super(sb, bg))
1681 has_super = 1;
1682 return (has_super + ext3_group_first_block_no(sb, bg));
1683 }
1684
1685
1686 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1687 {
1688 struct buffer_head * bh;
1689 struct ext3_super_block *es = NULL;
1690 struct ext3_sb_info *sbi;
1691 ext3_fsblk_t block;
1692 ext3_fsblk_t sb_block = get_sb_block(&data, sb);
1693 ext3_fsblk_t logic_sb_block;
1694 unsigned long offset = 0;
1695 unsigned int journal_inum = 0;
1696 unsigned long journal_devnum = 0;
1697 unsigned long def_mount_opts;
1698 struct inode *root;
1699 int blocksize;
1700 int hblock;
1701 int db_count;
1702 int i;
1703 int needs_recovery;
1704 int ret = -EINVAL;
1705 __le32 features;
1706 int err;
1707
1708 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1709 if (!sbi)
1710 return -ENOMEM;
1711
1712 sbi->s_blockgroup_lock =
1713 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1714 if (!sbi->s_blockgroup_lock) {
1715 kfree(sbi);
1716 return -ENOMEM;
1717 }
1718 sb->s_fs_info = sbi;
1719 sbi->s_sb_block = sb_block;
1720
1721 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1722 if (!blocksize) {
1723 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1724 goto out_fail;
1725 }
1726
1727 /*
1728 * The ext3 superblock will not be buffer aligned for other than 1kB
1729 * block sizes. We need to calculate the offset from buffer start.
1730 */
1731 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1732 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1733 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1734 } else {
1735 logic_sb_block = sb_block;
1736 }
1737
1738 if (!(bh = sb_bread(sb, logic_sb_block))) {
1739 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1740 goto out_fail;
1741 }
1742 /*
1743 * Note: s_es must be initialized as soon as possible because
1744 * some ext3 macro-instructions depend on its value
1745 */
1746 es = (struct ext3_super_block *) (bh->b_data + offset);
1747 sbi->s_es = es;
1748 sb->s_magic = le16_to_cpu(es->s_magic);
1749 if (sb->s_magic != EXT3_SUPER_MAGIC)
1750 goto cantfind_ext3;
1751
1752 /* Set defaults before we parse the mount options */
1753 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1754 if (def_mount_opts & EXT3_DEFM_DEBUG)
1755 set_opt(sbi->s_mount_opt, DEBUG);
1756 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1757 set_opt(sbi->s_mount_opt, GRPID);
1758 if (def_mount_opts & EXT3_DEFM_UID16)
1759 set_opt(sbi->s_mount_opt, NO_UID32);
1760 #ifdef CONFIG_EXT3_FS_XATTR
1761 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1762 set_opt(sbi->s_mount_opt, XATTR_USER);
1763 #endif
1764 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1765 if (def_mount_opts & EXT3_DEFM_ACL)
1766 set_opt(sbi->s_mount_opt, POSIX_ACL);
1767 #endif
1768 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1769 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1770 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1771 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1772 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1773 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1774
1775 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1776 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1777 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1778 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1779 else
1780 set_opt(sbi->s_mount_opt, ERRORS_RO);
1781
1782 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
1783 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
1784
1785 /* enable barriers by default */
1786 set_opt(sbi->s_mount_opt, BARRIER);
1787 set_opt(sbi->s_mount_opt, RESERVATION);
1788
1789 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1790 NULL, 0))
1791 goto failed_mount;
1792
1793 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1794 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1795
1796 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1797 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1798 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1799 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1800 ext3_msg(sb, KERN_WARNING,
1801 "warning: feature flags set on rev 0 fs, "
1802 "running e2fsck is recommended");
1803 /*
1804 * Check feature flags regardless of the revision level, since we
1805 * previously didn't change the revision level when setting the flags,
1806 * so there is a chance incompat flags are set on a rev 0 filesystem.
1807 */
1808 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1809 if (features) {
1810 ext3_msg(sb, KERN_ERR,
1811 "error: couldn't mount because of unsupported "
1812 "optional features (%x)", le32_to_cpu(features));
1813 goto failed_mount;
1814 }
1815 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1816 if (!(sb->s_flags & MS_RDONLY) && features) {
1817 ext3_msg(sb, KERN_ERR,
1818 "error: couldn't mount RDWR because of unsupported "
1819 "optional features (%x)", le32_to_cpu(features));
1820 goto failed_mount;
1821 }
1822 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1823
1824 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1825 blocksize > EXT3_MAX_BLOCK_SIZE) {
1826 ext3_msg(sb, KERN_ERR,
1827 "error: couldn't mount because of unsupported "
1828 "filesystem blocksize %d", blocksize);
1829 goto failed_mount;
1830 }
1831
1832 hblock = bdev_logical_block_size(sb->s_bdev);
1833 if (sb->s_blocksize != blocksize) {
1834 /*
1835 * Make sure the blocksize for the filesystem is larger
1836 * than the hardware sectorsize for the machine.
1837 */
1838 if (blocksize < hblock) {
1839 ext3_msg(sb, KERN_ERR,
1840 "error: fsblocksize %d too small for "
1841 "hardware sectorsize %d", blocksize, hblock);
1842 goto failed_mount;
1843 }
1844
1845 brelse (bh);
1846 if (!sb_set_blocksize(sb, blocksize)) {
1847 ext3_msg(sb, KERN_ERR,
1848 "error: bad blocksize %d", blocksize);
1849 goto out_fail;
1850 }
1851 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1852 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1853 bh = sb_bread(sb, logic_sb_block);
1854 if (!bh) {
1855 ext3_msg(sb, KERN_ERR,
1856 "error: can't read superblock on 2nd try");
1857 goto failed_mount;
1858 }
1859 es = (struct ext3_super_block *)(bh->b_data + offset);
1860 sbi->s_es = es;
1861 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1862 ext3_msg(sb, KERN_ERR,
1863 "error: magic mismatch");
1864 goto failed_mount;
1865 }
1866 }
1867
1868 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1869
1870 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1871 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1872 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1873 } else {
1874 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1875 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1876 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1877 (!is_power_of_2(sbi->s_inode_size)) ||
1878 (sbi->s_inode_size > blocksize)) {
1879 ext3_msg(sb, KERN_ERR,
1880 "error: unsupported inode size: %d",
1881 sbi->s_inode_size);
1882 goto failed_mount;
1883 }
1884 }
1885 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1886 le32_to_cpu(es->s_log_frag_size);
1887 if (blocksize != sbi->s_frag_size) {
1888 ext3_msg(sb, KERN_ERR,
1889 "error: fragsize %lu != blocksize %u (unsupported)",
1890 sbi->s_frag_size, blocksize);
1891 goto failed_mount;
1892 }
1893 sbi->s_frags_per_block = 1;
1894 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1895 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1896 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1897 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1898 goto cantfind_ext3;
1899 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1900 if (sbi->s_inodes_per_block == 0)
1901 goto cantfind_ext3;
1902 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1903 sbi->s_inodes_per_block;
1904 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1905 sbi->s_sbh = bh;
1906 sbi->s_mount_state = le16_to_cpu(es->s_state);
1907 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1908 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1909 for (i=0; i < 4; i++)
1910 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1911 sbi->s_def_hash_version = es->s_def_hash_version;
1912 i = le32_to_cpu(es->s_flags);
1913 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1914 sbi->s_hash_unsigned = 3;
1915 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1916 #ifdef __CHAR_UNSIGNED__
1917 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1918 sbi->s_hash_unsigned = 3;
1919 #else
1920 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1921 #endif
1922 }
1923
1924 if (sbi->s_blocks_per_group > blocksize * 8) {
1925 ext3_msg(sb, KERN_ERR,
1926 "#blocks per group too big: %lu",
1927 sbi->s_blocks_per_group);
1928 goto failed_mount;
1929 }
1930 if (sbi->s_frags_per_group > blocksize * 8) {
1931 ext3_msg(sb, KERN_ERR,
1932 "error: #fragments per group too big: %lu",
1933 sbi->s_frags_per_group);
1934 goto failed_mount;
1935 }
1936 if (sbi->s_inodes_per_group > blocksize * 8) {
1937 ext3_msg(sb, KERN_ERR,
1938 "error: #inodes per group too big: %lu",
1939 sbi->s_inodes_per_group);
1940 goto failed_mount;
1941 }
1942
1943 err = generic_check_addressable(sb->s_blocksize_bits,
1944 le32_to_cpu(es->s_blocks_count));
1945 if (err) {
1946 ext3_msg(sb, KERN_ERR,
1947 "error: filesystem is too large to mount safely");
1948 if (sizeof(sector_t) < 8)
1949 ext3_msg(sb, KERN_ERR,
1950 "error: CONFIG_LBDAF not enabled");
1951 ret = err;
1952 goto failed_mount;
1953 }
1954
1955 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1956 goto cantfind_ext3;
1957 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1958 le32_to_cpu(es->s_first_data_block) - 1)
1959 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1960 db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
1961 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1962 GFP_KERNEL);
1963 if (sbi->s_group_desc == NULL) {
1964 ext3_msg(sb, KERN_ERR,
1965 "error: not enough memory");
1966 ret = -ENOMEM;
1967 goto failed_mount;
1968 }
1969
1970 bgl_lock_init(sbi->s_blockgroup_lock);
1971
1972 for (i = 0; i < db_count; i++) {
1973 block = descriptor_loc(sb, logic_sb_block, i);
1974 sbi->s_group_desc[i] = sb_bread(sb, block);
1975 if (!sbi->s_group_desc[i]) {
1976 ext3_msg(sb, KERN_ERR,
1977 "error: can't read group descriptor %d", i);
1978 db_count = i;
1979 goto failed_mount2;
1980 }
1981 }
1982 if (!ext3_check_descriptors (sb)) {
1983 ext3_msg(sb, KERN_ERR,
1984 "error: group descriptors corrupted");
1985 goto failed_mount2;
1986 }
1987 sbi->s_gdb_count = db_count;
1988 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1989 spin_lock_init(&sbi->s_next_gen_lock);
1990
1991 /* per fileystem reservation list head & lock */
1992 spin_lock_init(&sbi->s_rsv_window_lock);
1993 sbi->s_rsv_window_root = RB_ROOT;
1994 /* Add a single, static dummy reservation to the start of the
1995 * reservation window list --- it gives us a placeholder for
1996 * append-at-start-of-list which makes the allocation logic
1997 * _much_ simpler. */
1998 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1999 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
2000 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
2001 sbi->s_rsv_window_head.rsv_goal_size = 0;
2002 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
2003
2004 /*
2005 * set up enough so that it can read an inode
2006 */
2007 sb->s_op = &ext3_sops;
2008 sb->s_export_op = &ext3_export_ops;
2009 sb->s_xattr = ext3_xattr_handlers;
2010 #ifdef CONFIG_QUOTA
2011 sb->s_qcop = &ext3_qctl_operations;
2012 sb->dq_op = &ext3_quota_operations;
2013 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
2014 #endif
2015 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
2016 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2017 mutex_init(&sbi->s_orphan_lock);
2018 mutex_init(&sbi->s_resize_lock);
2019
2020 sb->s_root = NULL;
2021
2022 needs_recovery = (es->s_last_orphan != 0 ||
2023 EXT3_HAS_INCOMPAT_FEATURE(sb,
2024 EXT3_FEATURE_INCOMPAT_RECOVER));
2025
2026 /*
2027 * The first inode we look at is the journal inode. Don't try
2028 * root first: it may be modified in the journal!
2029 */
2030 if (!test_opt(sb, NOLOAD) &&
2031 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
2032 if (ext3_load_journal(sb, es, journal_devnum))
2033 goto failed_mount2;
2034 } else if (journal_inum) {
2035 if (ext3_create_journal(sb, es, journal_inum))
2036 goto failed_mount2;
2037 } else {
2038 if (!silent)
2039 ext3_msg(sb, KERN_ERR,
2040 "error: no journal found. "
2041 "mounting ext3 over ext2?");
2042 goto failed_mount2;
2043 }
2044 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2045 ext3_count_free_blocks(sb), GFP_KERNEL);
2046 if (!err) {
2047 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2048 ext3_count_free_inodes(sb), GFP_KERNEL);
2049 }
2050 if (!err) {
2051 err = percpu_counter_init(&sbi->s_dirs_counter,
2052 ext3_count_dirs(sb), GFP_KERNEL);
2053 }
2054 if (err) {
2055 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
2056 ret = err;
2057 goto failed_mount3;
2058 }
2059
2060 /* We have now updated the journal if required, so we can
2061 * validate the data journaling mode. */
2062 switch (test_opt(sb, DATA_FLAGS)) {
2063 case 0:
2064 /* No mode set, assume a default based on the journal
2065 capabilities: ORDERED_DATA if the journal can
2066 cope, else JOURNAL_DATA */
2067 if (journal_check_available_features
2068 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
2069 set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
2070 else
2071 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2072 break;
2073
2074 case EXT3_MOUNT_ORDERED_DATA:
2075 case EXT3_MOUNT_WRITEBACK_DATA:
2076 if (!journal_check_available_features
2077 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
2078 ext3_msg(sb, KERN_ERR,
2079 "error: journal does not support "
2080 "requested data journaling mode");
2081 goto failed_mount3;
2082 }
2083 default:
2084 break;
2085 }
2086
2087 /*
2088 * The journal_load will have done any necessary log recovery,
2089 * so we can safely mount the rest of the filesystem now.
2090 */
2091
2092 root = ext3_iget(sb, EXT3_ROOT_INO);
2093 if (IS_ERR(root)) {
2094 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
2095 ret = PTR_ERR(root);
2096 goto failed_mount3;
2097 }
2098 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2099 iput(root);
2100 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
2101 goto failed_mount3;
2102 }
2103 sb->s_root = d_make_root(root);
2104 if (!sb->s_root) {
2105 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
2106 ret = -ENOMEM;
2107 goto failed_mount3;
2108 }
2109
2110 if (ext3_setup_super(sb, es, sb->s_flags & MS_RDONLY))
2111 sb->s_flags |= MS_RDONLY;
2112
2113 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2114 ext3_orphan_cleanup(sb, es);
2115 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2116 if (needs_recovery) {
2117 ext3_mark_recovery_complete(sb, es);
2118 ext3_msg(sb, KERN_INFO, "recovery complete");
2119 }
2120 ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
2121 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2122 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2123 "writeback");
2124
2125 return 0;
2126
2127 cantfind_ext3:
2128 if (!silent)
2129 ext3_msg(sb, KERN_INFO,
2130 "error: can't find ext3 filesystem on dev %s.",
2131 sb->s_id);
2132 goto failed_mount;
2133
2134 failed_mount3:
2135 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2136 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2137 percpu_counter_destroy(&sbi->s_dirs_counter);
2138 journal_destroy(sbi->s_journal);
2139 failed_mount2:
2140 for (i = 0; i < db_count; i++)
2141 brelse(sbi->s_group_desc[i]);
2142 kfree(sbi->s_group_desc);
2143 failed_mount:
2144 #ifdef CONFIG_QUOTA
2145 for (i = 0; i < EXT3_MAXQUOTAS; i++)
2146 kfree(sbi->s_qf_names[i]);
2147 #endif
2148 ext3_blkdev_remove(sbi);
2149 brelse(bh);
2150 out_fail:
2151 sb->s_fs_info = NULL;
2152 kfree(sbi->s_blockgroup_lock);
2153 kfree(sbi);
2154 return ret;
2155 }
2156
2157 /*
2158 * Setup any per-fs journal parameters now. We'll do this both on
2159 * initial mount, once the journal has been initialised but before we've
2160 * done any recovery; and again on any subsequent remount.
2161 */
2162 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2163 {
2164 struct ext3_sb_info *sbi = EXT3_SB(sb);
2165
2166 if (sbi->s_commit_interval)
2167 journal->j_commit_interval = sbi->s_commit_interval;
2168 /* We could also set up an ext3-specific default for the commit
2169 * interval here, but for now we'll just fall back to the jbd
2170 * default. */
2171
2172 spin_lock(&journal->j_state_lock);
2173 if (test_opt(sb, BARRIER))
2174 journal->j_flags |= JFS_BARRIER;
2175 else
2176 journal->j_flags &= ~JFS_BARRIER;
2177 if (test_opt(sb, DATA_ERR_ABORT))
2178 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2179 else
2180 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2181 spin_unlock(&journal->j_state_lock);
2182 }
2183
2184 static journal_t *ext3_get_journal(struct super_block *sb,
2185 unsigned int journal_inum)
2186 {
2187 struct inode *journal_inode;
2188 journal_t *journal;
2189
2190 /* First, test for the existence of a valid inode on disk. Bad
2191 * things happen if we iget() an unused inode, as the subsequent
2192 * iput() will try to delete it. */
2193
2194 journal_inode = ext3_iget(sb, journal_inum);
2195 if (IS_ERR(journal_inode)) {
2196 ext3_msg(sb, KERN_ERR, "error: no journal found");
2197 return NULL;
2198 }
2199 if (!journal_inode->i_nlink) {
2200 make_bad_inode(journal_inode);
2201 iput(journal_inode);
2202 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
2203 return NULL;
2204 }
2205
2206 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2207 journal_inode, journal_inode->i_size);
2208 if (!S_ISREG(journal_inode->i_mode)) {
2209 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
2210 iput(journal_inode);
2211 return NULL;
2212 }
2213
2214 journal = journal_init_inode(journal_inode);
2215 if (!journal) {
2216 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
2217 iput(journal_inode);
2218 return NULL;
2219 }
2220 journal->j_private = sb;
2221 ext3_init_journal_params(sb, journal);
2222 return journal;
2223 }
2224
2225 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2226 dev_t j_dev)
2227 {
2228 struct buffer_head * bh;
2229 journal_t *journal;
2230 ext3_fsblk_t start;
2231 ext3_fsblk_t len;
2232 int hblock, blocksize;
2233 ext3_fsblk_t sb_block;
2234 unsigned long offset;
2235 struct ext3_super_block * es;
2236 struct block_device *bdev;
2237
2238 bdev = ext3_blkdev_get(j_dev, sb);
2239 if (bdev == NULL)
2240 return NULL;
2241
2242 blocksize = sb->s_blocksize;
2243 hblock = bdev_logical_block_size(bdev);
2244 if (blocksize < hblock) {
2245 ext3_msg(sb, KERN_ERR,
2246 "error: blocksize too small for journal device");
2247 goto out_bdev;
2248 }
2249
2250 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2251 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2252 set_blocksize(bdev, blocksize);
2253 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2254 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2255 "external journal");
2256 goto out_bdev;
2257 }
2258
2259 es = (struct ext3_super_block *) (bh->b_data + offset);
2260 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2261 !(le32_to_cpu(es->s_feature_incompat) &
2262 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2263 ext3_msg(sb, KERN_ERR, "error: external journal has "
2264 "bad superblock");
2265 brelse(bh);
2266 goto out_bdev;
2267 }
2268
2269 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2270 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
2271 brelse(bh);
2272 goto out_bdev;
2273 }
2274
2275 len = le32_to_cpu(es->s_blocks_count);
2276 start = sb_block + 1;
2277 brelse(bh); /* we're done with the superblock */
2278
2279 journal = journal_init_dev(bdev, sb->s_bdev,
2280 start, len, blocksize);
2281 if (!journal) {
2282 ext3_msg(sb, KERN_ERR,
2283 "error: failed to create device journal");
2284 goto out_bdev;
2285 }
2286 journal->j_private = sb;
2287 if (!bh_uptodate_or_lock(journal->j_sb_buffer)) {
2288 if (bh_submit_read(journal->j_sb_buffer)) {
2289 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2290 goto out_journal;
2291 }
2292 }
2293 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2294 ext3_msg(sb, KERN_ERR,
2295 "error: external journal has more than one "
2296 "user (unsupported) - %d",
2297 be32_to_cpu(journal->j_superblock->s_nr_users));
2298 goto out_journal;
2299 }
2300 EXT3_SB(sb)->journal_bdev = bdev;
2301 ext3_init_journal_params(sb, journal);
2302 return journal;
2303 out_journal:
2304 journal_destroy(journal);
2305 out_bdev:
2306 ext3_blkdev_put(bdev);
2307 return NULL;
2308 }
2309
2310 static int ext3_load_journal(struct super_block *sb,
2311 struct ext3_super_block *es,
2312 unsigned long journal_devnum)
2313 {
2314 journal_t *journal;
2315 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2316 dev_t journal_dev;
2317 int err = 0;
2318 int really_read_only;
2319
2320 if (journal_devnum &&
2321 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2322 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2323 "numbers have changed");
2324 journal_dev = new_decode_dev(journal_devnum);
2325 } else
2326 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2327
2328 really_read_only = bdev_read_only(sb->s_bdev);
2329
2330 /*
2331 * Are we loading a blank journal or performing recovery after a
2332 * crash? For recovery, we need to check in advance whether we
2333 * can get read-write access to the device.
2334 */
2335
2336 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2337 if (sb->s_flags & MS_RDONLY) {
2338 ext3_msg(sb, KERN_INFO,
2339 "recovery required on readonly filesystem");
2340 if (really_read_only) {
2341 ext3_msg(sb, KERN_ERR, "error: write access "
2342 "unavailable, cannot proceed");
2343 return -EROFS;
2344 }
2345 ext3_msg(sb, KERN_INFO,
2346 "write access will be enabled during recovery");
2347 }
2348 }
2349
2350 if (journal_inum && journal_dev) {
2351 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2352 "and inode journals");
2353 return -EINVAL;
2354 }
2355
2356 if (journal_inum) {
2357 if (!(journal = ext3_get_journal(sb, journal_inum)))
2358 return -EINVAL;
2359 } else {
2360 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2361 return -EINVAL;
2362 }
2363
2364 if (!(journal->j_flags & JFS_BARRIER))
2365 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2366
2367 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2368 err = journal_update_format(journal);
2369 if (err) {
2370 ext3_msg(sb, KERN_ERR, "error updating journal");
2371 journal_destroy(journal);
2372 return err;
2373 }
2374 }
2375
2376 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2377 err = journal_wipe(journal, !really_read_only);
2378 if (!err)
2379 err = journal_load(journal);
2380
2381 if (err) {
2382 ext3_msg(sb, KERN_ERR, "error loading journal");
2383 journal_destroy(journal);
2384 return err;
2385 }
2386
2387 EXT3_SB(sb)->s_journal = journal;
2388 ext3_clear_journal_err(sb, es);
2389
2390 if (!really_read_only && journal_devnum &&
2391 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2392 es->s_journal_dev = cpu_to_le32(journal_devnum);
2393
2394 /* Make sure we flush the recovery flag to disk. */
2395 ext3_commit_super(sb, es, 1);
2396 }
2397
2398 return 0;
2399 }
2400
2401 static int ext3_create_journal(struct super_block *sb,
2402 struct ext3_super_block *es,
2403 unsigned int journal_inum)
2404 {
2405 journal_t *journal;
2406 int err;
2407
2408 if (sb->s_flags & MS_RDONLY) {
2409 ext3_msg(sb, KERN_ERR,
2410 "error: readonly filesystem when trying to "
2411 "create journal");
2412 return -EROFS;
2413 }
2414
2415 journal = ext3_get_journal(sb, journal_inum);
2416 if (!journal)
2417 return -EINVAL;
2418
2419 ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
2420 journal_inum);
2421
2422 err = journal_create(journal);
2423 if (err) {
2424 ext3_msg(sb, KERN_ERR, "error creating journal");
2425 journal_destroy(journal);
2426 return -EIO;
2427 }
2428
2429 EXT3_SB(sb)->s_journal = journal;
2430
2431 ext3_update_dynamic_rev(sb);
2432 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2433 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2434
2435 es->s_journal_inum = cpu_to_le32(journal_inum);
2436
2437 /* Make sure we flush the recovery flag to disk. */
2438 ext3_commit_super(sb, es, 1);
2439
2440 return 0;
2441 }
2442
2443 static int ext3_commit_super(struct super_block *sb,
2444 struct ext3_super_block *es,
2445 int sync)
2446 {
2447 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2448 int error = 0;
2449
2450 if (!sbh)
2451 return error;
2452
2453 if (buffer_write_io_error(sbh)) {
2454 /*
2455 * Oh, dear. A previous attempt to write the
2456 * superblock failed. This could happen because the
2457 * USB device was yanked out. Or it could happen to
2458 * be a transient write error and maybe the block will
2459 * be remapped. Nothing we can do but to retry the
2460 * write and hope for the best.
2461 */
2462 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2463 "superblock detected");
2464 clear_buffer_write_io_error(sbh);
2465 set_buffer_uptodate(sbh);
2466 }
2467 /*
2468 * If the file system is mounted read-only, don't update the
2469 * superblock write time. This avoids updating the superblock
2470 * write time when we are mounting the root file system
2471 * read/only but we need to replay the journal; at that point,
2472 * for people who are east of GMT and who make their clock
2473 * tick in localtime for Windows bug-for-bug compatibility,
2474 * the clock is set in the future, and this will cause e2fsck
2475 * to complain and force a full file system check.
2476 */
2477 if (!(sb->s_flags & MS_RDONLY))
2478 es->s_wtime = cpu_to_le32(get_seconds());
2479 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2480 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2481 BUFFER_TRACE(sbh, "marking dirty");
2482 mark_buffer_dirty(sbh);
2483 if (sync) {
2484 error = sync_dirty_buffer(sbh);
2485 if (buffer_write_io_error(sbh)) {
2486 ext3_msg(sb, KERN_ERR, "I/O error while writing "
2487 "superblock");
2488 clear_buffer_write_io_error(sbh);
2489 set_buffer_uptodate(sbh);
2490 }
2491 }
2492 return error;
2493 }
2494
2495
2496 /*
2497 * Have we just finished recovery? If so, and if we are mounting (or
2498 * remounting) the filesystem readonly, then we will end up with a
2499 * consistent fs on disk. Record that fact.
2500 */
2501 static void ext3_mark_recovery_complete(struct super_block * sb,
2502 struct ext3_super_block * es)
2503 {
2504 journal_t *journal = EXT3_SB(sb)->s_journal;
2505
2506 journal_lock_updates(journal);
2507 if (journal_flush(journal) < 0)
2508 goto out;
2509
2510 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2511 sb->s_flags & MS_RDONLY) {
2512 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2513 ext3_commit_super(sb, es, 1);
2514 }
2515
2516 out:
2517 journal_unlock_updates(journal);
2518 }
2519
2520 /*
2521 * If we are mounting (or read-write remounting) a filesystem whose journal
2522 * has recorded an error from a previous lifetime, move that error to the
2523 * main filesystem now.
2524 */
2525 static void ext3_clear_journal_err(struct super_block *sb,
2526 struct ext3_super_block *es)
2527 {
2528 journal_t *journal;
2529 int j_errno;
2530 const char *errstr;
2531
2532 journal = EXT3_SB(sb)->s_journal;
2533
2534 /*
2535 * Now check for any error status which may have been recorded in the
2536 * journal by a prior ext3_error() or ext3_abort()
2537 */
2538
2539 j_errno = journal_errno(journal);
2540 if (j_errno) {
2541 char nbuf[16];
2542
2543 errstr = ext3_decode_error(sb, j_errno, nbuf);
2544 ext3_warning(sb, __func__, "Filesystem error recorded "
2545 "from previous mount: %s", errstr);
2546 ext3_warning(sb, __func__, "Marking fs in need of "
2547 "filesystem check.");
2548
2549 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2550 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2551 ext3_commit_super (sb, es, 1);
2552
2553 journal_clear_err(journal);
2554 }
2555 }
2556
2557 /*
2558 * Force the running and committing transactions to commit,
2559 * and wait on the commit.
2560 */
2561 int ext3_force_commit(struct super_block *sb)
2562 {
2563 journal_t *journal;
2564 int ret;
2565
2566 if (sb->s_flags & MS_RDONLY)
2567 return 0;
2568
2569 journal = EXT3_SB(sb)->s_journal;
2570 ret = ext3_journal_force_commit(journal);
2571 return ret;
2572 }
2573
2574 static int ext3_sync_fs(struct super_block *sb, int wait)
2575 {
2576 tid_t target;
2577
2578 trace_ext3_sync_fs(sb, wait);
2579 /*
2580 * Writeback quota in non-journalled quota case - journalled quota has
2581 * no dirty dquots
2582 */
2583 dquot_writeback_dquots(sb, -1);
2584 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2585 if (wait)
2586 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2587 }
2588 return 0;
2589 }
2590
2591 /*
2592 * LVM calls this function before a (read-only) snapshot is created. This
2593 * gives us a chance to flush the journal completely and mark the fs clean.
2594 */
2595 static int ext3_freeze(struct super_block *sb)
2596 {
2597 int error = 0;
2598 journal_t *journal;
2599
2600 if (!(sb->s_flags & MS_RDONLY)) {
2601 journal = EXT3_SB(sb)->s_journal;
2602
2603 /* Now we set up the journal barrier. */
2604 journal_lock_updates(journal);
2605
2606 /*
2607 * We don't want to clear needs_recovery flag when we failed
2608 * to flush the journal.
2609 */
2610 error = journal_flush(journal);
2611 if (error < 0)
2612 goto out;
2613
2614 /* Journal blocked and flushed, clear needs_recovery flag. */
2615 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2616 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2617 if (error)
2618 goto out;
2619 }
2620 return 0;
2621
2622 out:
2623 journal_unlock_updates(journal);
2624 return error;
2625 }
2626
2627 /*
2628 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2629 * flag here, even though the filesystem is not technically dirty yet.
2630 */
2631 static int ext3_unfreeze(struct super_block *sb)
2632 {
2633 if (!(sb->s_flags & MS_RDONLY)) {
2634 /* Reser the needs_recovery flag before the fs is unlocked. */
2635 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2636 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2637 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2638 }
2639 return 0;
2640 }
2641
2642 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2643 {
2644 struct ext3_super_block * es;
2645 struct ext3_sb_info *sbi = EXT3_SB(sb);
2646 ext3_fsblk_t n_blocks_count = 0;
2647 unsigned long old_sb_flags;
2648 struct ext3_mount_options old_opts;
2649 int enable_quota = 0;
2650 int err;
2651 #ifdef CONFIG_QUOTA
2652 int i;
2653 #endif
2654
2655 sync_filesystem(sb);
2656
2657 /* Store the original options */
2658 old_sb_flags = sb->s_flags;
2659 old_opts.s_mount_opt = sbi->s_mount_opt;
2660 old_opts.s_resuid = sbi->s_resuid;
2661 old_opts.s_resgid = sbi->s_resgid;
2662 old_opts.s_commit_interval = sbi->s_commit_interval;
2663 #ifdef CONFIG_QUOTA
2664 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2665 for (i = 0; i < EXT3_MAXQUOTAS; i++)
2666 if (sbi->s_qf_names[i]) {
2667 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
2668 GFP_KERNEL);
2669 if (!old_opts.s_qf_names[i]) {
2670 int j;
2671
2672 for (j = 0; j < i; j++)
2673 kfree(old_opts.s_qf_names[j]);
2674 return -ENOMEM;
2675 }
2676 } else
2677 old_opts.s_qf_names[i] = NULL;
2678 #endif
2679
2680 /*
2681 * Allow the "check" option to be passed as a remount option.
2682 */
2683 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2684 err = -EINVAL;
2685 goto restore_opts;
2686 }
2687
2688 if (test_opt(sb, ABORT))
2689 ext3_abort(sb, __func__, "Abort forced by user");
2690
2691 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2692 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2693
2694 es = sbi->s_es;
2695
2696 ext3_init_journal_params(sb, sbi->s_journal);
2697
2698 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2699 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2700 if (test_opt(sb, ABORT)) {
2701 err = -EROFS;
2702 goto restore_opts;
2703 }
2704
2705 if (*flags & MS_RDONLY) {
2706 err = dquot_suspend(sb, -1);
2707 if (err < 0)
2708 goto restore_opts;
2709
2710 /*
2711 * First of all, the unconditional stuff we have to do
2712 * to disable replay of the journal when we next remount
2713 */
2714 sb->s_flags |= MS_RDONLY;
2715
2716 /*
2717 * OK, test if we are remounting a valid rw partition
2718 * readonly, and if so set the rdonly flag and then
2719 * mark the partition as valid again.
2720 */
2721 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2722 (sbi->s_mount_state & EXT3_VALID_FS))
2723 es->s_state = cpu_to_le16(sbi->s_mount_state);
2724
2725 ext3_mark_recovery_complete(sb, es);
2726 } else {
2727 __le32 ret;
2728 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2729 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2730 ext3_msg(sb, KERN_WARNING,
2731 "warning: couldn't remount RDWR "
2732 "because of unsupported optional "
2733 "features (%x)", le32_to_cpu(ret));
2734 err = -EROFS;
2735 goto restore_opts;
2736 }
2737
2738 /*
2739 * If we have an unprocessed orphan list hanging
2740 * around from a previously readonly bdev mount,
2741 * require a full umount & mount for now.
2742 */
2743 if (es->s_last_orphan) {
2744 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
2745 "remount RDWR because of unprocessed "
2746 "orphan inode list. Please "
2747 "umount & mount instead.");
2748 err = -EINVAL;
2749 goto restore_opts;
2750 }
2751
2752 /*
2753 * Mounting a RDONLY partition read-write, so reread
2754 * and store the current valid flag. (It may have
2755 * been changed by e2fsck since we originally mounted
2756 * the partition.)
2757 */
2758 ext3_clear_journal_err(sb, es);
2759 sbi->s_mount_state = le16_to_cpu(es->s_state);
2760 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2761 goto restore_opts;
2762 if (!ext3_setup_super (sb, es, 0))
2763 sb->s_flags &= ~MS_RDONLY;
2764 enable_quota = 1;
2765 }
2766 }
2767 #ifdef CONFIG_QUOTA
2768 /* Release old quota file names */
2769 for (i = 0; i < EXT3_MAXQUOTAS; i++)
2770 kfree(old_opts.s_qf_names[i]);
2771 #endif
2772 if (enable_quota)
2773 dquot_resume(sb, -1);
2774 return 0;
2775 restore_opts:
2776 sb->s_flags = old_sb_flags;
2777 sbi->s_mount_opt = old_opts.s_mount_opt;
2778 sbi->s_resuid = old_opts.s_resuid;
2779 sbi->s_resgid = old_opts.s_resgid;
2780 sbi->s_commit_interval = old_opts.s_commit_interval;
2781 #ifdef CONFIG_QUOTA
2782 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2783 for (i = 0; i < EXT3_MAXQUOTAS; i++) {
2784 kfree(sbi->s_qf_names[i]);
2785 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2786 }
2787 #endif
2788 return err;
2789 }
2790
2791 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2792 {
2793 struct super_block *sb = dentry->d_sb;
2794 struct ext3_sb_info *sbi = EXT3_SB(sb);
2795 struct ext3_super_block *es = sbi->s_es;
2796 u64 fsid;
2797
2798 if (test_opt(sb, MINIX_DF)) {
2799 sbi->s_overhead_last = 0;
2800 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2801 unsigned long ngroups = sbi->s_groups_count, i;
2802 ext3_fsblk_t overhead = 0;
2803 smp_rmb();
2804
2805 /*
2806 * Compute the overhead (FS structures). This is constant
2807 * for a given filesystem unless the number of block groups
2808 * changes so we cache the previous value until it does.
2809 */
2810
2811 /*
2812 * All of the blocks before first_data_block are
2813 * overhead
2814 */
2815 overhead = le32_to_cpu(es->s_first_data_block);
2816
2817 /*
2818 * Add the overhead attributed to the superblock and
2819 * block group descriptors. If the sparse superblocks
2820 * feature is turned on, then not all groups have this.
2821 */
2822 for (i = 0; i < ngroups; i++) {
2823 overhead += ext3_bg_has_super(sb, i) +
2824 ext3_bg_num_gdb(sb, i);
2825 cond_resched();
2826 }
2827
2828 /*
2829 * Every block group has an inode bitmap, a block
2830 * bitmap, and an inode table.
2831 */
2832 overhead += ngroups * (2 + sbi->s_itb_per_group);
2833
2834 /* Add the internal journal blocks as well */
2835 if (sbi->s_journal && !sbi->journal_bdev)
2836 overhead += sbi->s_journal->j_maxlen;
2837
2838 sbi->s_overhead_last = overhead;
2839 smp_wmb();
2840 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2841 }
2842
2843 buf->f_type = EXT3_SUPER_MAGIC;
2844 buf->f_bsize = sb->s_blocksize;
2845 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2846 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2847 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2848 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2849 buf->f_bavail = 0;
2850 buf->f_files = le32_to_cpu(es->s_inodes_count);
2851 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2852 buf->f_namelen = EXT3_NAME_LEN;
2853 fsid = le64_to_cpup((void *)es->s_uuid) ^
2854 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2855 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2856 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2857 return 0;
2858 }
2859
2860 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2861 * is locked for write. Otherwise the are possible deadlocks:
2862 * Process 1 Process 2
2863 * ext3_create() quota_sync()
2864 * journal_start() write_dquot()
2865 * dquot_initialize() down(dqio_mutex)
2866 * down(dqio_mutex) journal_start()
2867 *
2868 */
2869
2870 #ifdef CONFIG_QUOTA
2871
2872 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2873 {
2874 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
2875 }
2876
2877 static int ext3_write_dquot(struct dquot *dquot)
2878 {
2879 int ret, err;
2880 handle_t *handle;
2881 struct inode *inode;
2882
2883 inode = dquot_to_inode(dquot);
2884 handle = ext3_journal_start(inode,
2885 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2886 if (IS_ERR(handle))
2887 return PTR_ERR(handle);
2888 ret = dquot_commit(dquot);
2889 err = ext3_journal_stop(handle);
2890 if (!ret)
2891 ret = err;
2892 return ret;
2893 }
2894
2895 static int ext3_acquire_dquot(struct dquot *dquot)
2896 {
2897 int ret, err;
2898 handle_t *handle;
2899
2900 handle = ext3_journal_start(dquot_to_inode(dquot),
2901 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2902 if (IS_ERR(handle))
2903 return PTR_ERR(handle);
2904 ret = dquot_acquire(dquot);
2905 err = ext3_journal_stop(handle);
2906 if (!ret)
2907 ret = err;
2908 return ret;
2909 }
2910
2911 static int ext3_release_dquot(struct dquot *dquot)
2912 {
2913 int ret, err;
2914 handle_t *handle;
2915
2916 handle = ext3_journal_start(dquot_to_inode(dquot),
2917 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2918 if (IS_ERR(handle)) {
2919 /* Release dquot anyway to avoid endless cycle in dqput() */
2920 dquot_release(dquot);
2921 return PTR_ERR(handle);
2922 }
2923 ret = dquot_release(dquot);
2924 err = ext3_journal_stop(handle);
2925 if (!ret)
2926 ret = err;
2927 return ret;
2928 }
2929
2930 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2931 {
2932 /* Are we journaling quotas? */
2933 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2934 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2935 dquot_mark_dquot_dirty(dquot);
2936 return ext3_write_dquot(dquot);
2937 } else {
2938 return dquot_mark_dquot_dirty(dquot);
2939 }
2940 }
2941
2942 static int ext3_write_info(struct super_block *sb, int type)
2943 {
2944 int ret, err;
2945 handle_t *handle;
2946
2947 /* Data block + inode block */
2948 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2949 if (IS_ERR(handle))
2950 return PTR_ERR(handle);
2951 ret = dquot_commit_info(sb, type);
2952 err = ext3_journal_stop(handle);
2953 if (!ret)
2954 ret = err;
2955 return ret;
2956 }
2957
2958 /*
2959 * Turn on quotas during mount time - we need to find
2960 * the quota file and such...
2961 */
2962 static int ext3_quota_on_mount(struct super_block *sb, int type)
2963 {
2964 return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2965 EXT3_SB(sb)->s_jquota_fmt, type);
2966 }
2967
2968 /*
2969 * Standard function to be called on quota_on
2970 */
2971 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2972 struct path *path)
2973 {
2974 int err;
2975
2976 if (!test_opt(sb, QUOTA))
2977 return -EINVAL;
2978
2979 /* Quotafile not on the same filesystem? */
2980 if (path->dentry->d_sb != sb)
2981 return -EXDEV;
2982 /* Journaling quota? */
2983 if (EXT3_SB(sb)->s_qf_names[type]) {
2984 /* Quotafile not of fs root? */
2985 if (path->dentry->d_parent != sb->s_root)
2986 ext3_msg(sb, KERN_WARNING,
2987 "warning: Quota file not on filesystem root. "
2988 "Journaled quota will not work.");
2989 }
2990
2991 /*
2992 * When we journal data on quota file, we have to flush journal to see
2993 * all updates to the file when we bypass pagecache...
2994 */
2995 if (ext3_should_journal_data(path->dentry->d_inode)) {
2996 /*
2997 * We don't need to lock updates but journal_flush() could
2998 * otherwise be livelocked...
2999 */
3000 journal_lock_updates(EXT3_SB(sb)->s_journal);
3001 err = journal_flush(EXT3_SB(sb)->s_journal);
3002 journal_unlock_updates(EXT3_SB(sb)->s_journal);
3003 if (err)
3004 return err;
3005 }
3006
3007 return dquot_quota_on(sb, type, format_id, path);
3008 }
3009
3010 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3011 * acquiring the locks... As quota files are never truncated and quota code
3012 * itself serializes the operations (and no one else should touch the files)
3013 * we don't have to be afraid of races */
3014 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
3015 size_t len, loff_t off)
3016 {
3017 struct inode *inode = sb_dqopt(sb)->files[type];
3018 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
3019 int err = 0;
3020 int offset = off & (sb->s_blocksize - 1);
3021 int tocopy;
3022 size_t toread;
3023 struct buffer_head *bh;
3024 loff_t i_size = i_size_read(inode);
3025
3026 if (off > i_size)
3027 return 0;
3028 if (off+len > i_size)
3029 len = i_size-off;
3030 toread = len;
3031 while (toread > 0) {
3032 tocopy = sb->s_blocksize - offset < toread ?
3033 sb->s_blocksize - offset : toread;
3034 bh = ext3_bread(NULL, inode, blk, 0, &err);
3035 if (err)
3036 return err;
3037 if (!bh) /* A hole? */
3038 memset(data, 0, tocopy);
3039 else
3040 memcpy(data, bh->b_data+offset, tocopy);
3041 brelse(bh);
3042 offset = 0;
3043 toread -= tocopy;
3044 data += tocopy;
3045 blk++;
3046 }
3047 return len;
3048 }
3049
3050 /* Write to quotafile (we know the transaction is already started and has
3051 * enough credits) */
3052 static ssize_t ext3_quota_write(struct super_block *sb, int type,
3053 const char *data, size_t len, loff_t off)
3054 {
3055 struct inode *inode = sb_dqopt(sb)->files[type];
3056 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
3057 int err = 0;
3058 int offset = off & (sb->s_blocksize - 1);
3059 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
3060 struct buffer_head *bh;
3061 handle_t *handle = journal_current_handle();
3062
3063 if (!handle) {
3064 ext3_msg(sb, KERN_WARNING,
3065 "warning: quota write (off=%llu, len=%llu)"
3066 " cancelled because transaction is not started.",
3067 (unsigned long long)off, (unsigned long long)len);
3068 return -EIO;
3069 }
3070
3071 /*
3072 * Since we account only one data block in transaction credits,
3073 * then it is impossible to cross a block boundary.
3074 */
3075 if (sb->s_blocksize - offset < len) {
3076 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3077 " cancelled because not block aligned",
3078 (unsigned long long)off, (unsigned long long)len);
3079 return -EIO;
3080 }
3081 bh = ext3_bread(handle, inode, blk, 1, &err);
3082 if (!bh)
3083 goto out;
3084 if (journal_quota) {
3085 err = ext3_journal_get_write_access(handle, bh);
3086 if (err) {
3087 brelse(bh);
3088 goto out;
3089 }
3090 }
3091 lock_buffer(bh);
3092 memcpy(bh->b_data+offset, data, len);
3093 flush_dcache_page(bh->b_page);
3094 unlock_buffer(bh);
3095 if (journal_quota)
3096 err = ext3_journal_dirty_metadata(handle, bh);
3097 else {
3098 /* Always do at least ordered writes for quotas */
3099 err = ext3_journal_dirty_data(handle, bh);
3100 mark_buffer_dirty(bh);
3101 }
3102 brelse(bh);
3103 out:
3104 if (err)
3105 return err;
3106 if (inode->i_size < off + len) {
3107 i_size_write(inode, off + len);
3108 EXT3_I(inode)->i_disksize = inode->i_size;
3109 }
3110 inode->i_version++;
3111 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3112 ext3_mark_inode_dirty(handle, inode);
3113 return len;
3114 }
3115
3116 #endif
3117
3118 static struct dentry *ext3_mount(struct file_system_type *fs_type,
3119 int flags, const char *dev_name, void *data)
3120 {
3121 return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
3122 }
3123
3124 static struct file_system_type ext3_fs_type = {
3125 .owner = THIS_MODULE,
3126 .name = "ext3",
3127 .mount = ext3_mount,
3128 .kill_sb = kill_block_super,
3129 .fs_flags = FS_REQUIRES_DEV,
3130 };
3131 MODULE_ALIAS_FS("ext3");
3132
3133 static int __init init_ext3_fs(void)
3134 {
3135 int err = init_ext3_xattr();
3136 if (err)
3137 return err;
3138 err = init_inodecache();
3139 if (err)
3140 goto out1;
3141 err = register_filesystem(&ext3_fs_type);
3142 if (err)
3143 goto out;
3144 return 0;
3145 out:
3146 destroy_inodecache();
3147 out1:
3148 exit_ext3_xattr();
3149 return err;
3150 }
3151
3152 static void __exit exit_ext3_fs(void)
3153 {
3154 unregister_filesystem(&ext3_fs_type);
3155 destroy_inodecache();
3156 exit_ext3_xattr();
3157 }
3158
3159 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3160 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3161 MODULE_LICENSE("GPL");
3162 module_init(init_ext3_fs)
3163 module_exit(exit_ext3_fs)
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