2 * linux/fs/ext3/super.c
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)
11 * linux/fs/minix/inode.c
13 * Copyright (C) 1991, 1992 Linus Torvalds
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
19 #include <linux/module.h>
20 #include <linux/string.h>
22 #include <linux/time.h>
23 #include <linux/jbd.h>
24 #include <linux/ext3_fs.h>
25 #include <linux/ext3_jbd.h>
26 #include <linux/slab.h>
27 #include <linux/init.h>
28 #include <linux/blkdev.h>
29 #include <linux/parser.h>
30 #include <linux/buffer_head.h>
31 #include <linux/exportfs.h>
32 #include <linux/vfs.h>
33 #include <linux/random.h>
34 #include <linux/mount.h>
35 #include <linux/namei.h>
36 #include <linux/quotaops.h>
37 #include <linux/seq_file.h>
38 #include <linux/log2.h>
40 #include <asm/uaccess.h>
46 #ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
47 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
49 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
52 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
53 unsigned long journal_devnum);
54 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
56 static int ext3_commit_super(struct super_block *sb,
57 struct ext3_super_block *es,
59 static void ext3_mark_recovery_complete(struct super_block * sb,
60 struct ext3_super_block * es);
61 static void ext3_clear_journal_err(struct super_block * sb,
62 struct ext3_super_block * es);
63 static int ext3_sync_fs(struct super_block *sb, int wait);
64 static const char *ext3_decode_error(struct super_block * sb, int errno,
66 static int ext3_remount (struct super_block * sb, int * flags, char * data);
67 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
68 static int ext3_unfreeze(struct super_block *sb);
69 static int ext3_freeze(struct super_block *sb);
72 * Wrappers for journal_start/end.
74 * The only special thing we need to do here is to make sure that all
75 * journal_end calls result in the superblock being marked dirty, so
76 * that sync() will call the filesystem's write_super callback if
79 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
83 if (sb->s_flags & MS_RDONLY)
84 return ERR_PTR(-EROFS);
86 /* Special case here: if the journal has aborted behind our
87 * backs (eg. EIO in the commit thread), then we still need to
88 * take the FS itself readonly cleanly. */
89 journal = EXT3_SB(sb)->s_journal;
90 if (is_journal_aborted(journal)) {
91 ext3_abort(sb, __func__,
92 "Detected aborted journal");
93 return ERR_PTR(-EROFS);
96 return journal_start(journal, nblocks);
100 * The only special thing we need to do here is to make sure that all
101 * journal_stop calls result in the superblock being marked dirty, so
102 * that sync() will call the filesystem's write_super callback if
105 int __ext3_journal_stop(const char *where, handle_t *handle)
107 struct super_block *sb;
111 sb = handle->h_transaction->t_journal->j_private;
113 rc = journal_stop(handle);
118 __ext3_std_error(sb, where, err);
122 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
123 struct buffer_head *bh, handle_t *handle, int err)
126 const char *errstr = ext3_decode_error(NULL, err, nbuf);
129 BUFFER_TRACE(bh, "abort");
134 if (is_handle_aborted(handle))
137 printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
138 caller, errstr, err_fn);
140 journal_abort_handle(handle);
143 void ext3_msg(struct super_block *sb, const char *prefix,
144 const char *fmt, ...)
146 struct va_format vaf;
154 printk("%sEXT3-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
159 /* Deal with the reporting of failure conditions on a filesystem such as
160 * inconsistencies detected or read IO failures.
162 * On ext2, we can store the error state of the filesystem in the
163 * superblock. That is not possible on ext3, because we may have other
164 * write ordering constraints on the superblock which prevent us from
165 * writing it out straight away; and given that the journal is about to
166 * be aborted, we can't rely on the current, or future, transactions to
167 * write out the superblock safely.
169 * We'll just use the journal_abort() error code to record an error in
170 * the journal instead. On recovery, the journal will complain about
171 * that error until we've noted it down and cleared it.
174 static void ext3_handle_error(struct super_block *sb)
176 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
178 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
179 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
181 if (sb->s_flags & MS_RDONLY)
184 if (!test_opt (sb, ERRORS_CONT)) {
185 journal_t *journal = EXT3_SB(sb)->s_journal;
187 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
189 journal_abort(journal, -EIO);
191 if (test_opt (sb, ERRORS_RO)) {
192 ext3_msg(sb, KERN_CRIT,
193 "error: remounting filesystem read-only");
194 sb->s_flags |= MS_RDONLY;
196 ext3_commit_super(sb, es, 1);
197 if (test_opt(sb, ERRORS_PANIC))
198 panic("EXT3-fs (%s): panic forced after error\n",
202 void ext3_error(struct super_block *sb, const char *function,
203 const char *fmt, ...)
205 struct va_format vaf;
213 printk(KERN_CRIT "EXT3-fs error (device %s): %s: %pV\n",
214 sb->s_id, function, &vaf);
218 ext3_handle_error(sb);
221 static const char *ext3_decode_error(struct super_block * sb, int errno,
228 errstr = "IO failure";
231 errstr = "Out of memory";
234 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
235 errstr = "Journal has aborted";
237 errstr = "Readonly filesystem";
240 /* If the caller passed in an extra buffer for unknown
241 * errors, textualise them now. Else we just return
244 /* Check for truncated error codes... */
245 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
254 /* __ext3_std_error decodes expected errors from journaling functions
255 * automatically and invokes the appropriate error response. */
257 void __ext3_std_error (struct super_block * sb, const char * function,
263 /* Special case: if the error is EROFS, and we're not already
264 * inside a transaction, then there's really no point in logging
266 if (errno == -EROFS && journal_current_handle() == NULL &&
267 (sb->s_flags & MS_RDONLY))
270 errstr = ext3_decode_error(sb, errno, nbuf);
271 ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
273 ext3_handle_error(sb);
277 * ext3_abort is a much stronger failure handler than ext3_error. The
278 * abort function may be used to deal with unrecoverable failures such
279 * as journal IO errors or ENOMEM at a critical moment in log management.
281 * We unconditionally force the filesystem into an ABORT|READONLY state,
282 * unless the error response on the fs has been set to panic in which
283 * case we take the easy way out and panic immediately.
286 void ext3_abort(struct super_block *sb, const char *function,
287 const char *fmt, ...)
289 struct va_format vaf;
297 printk(KERN_CRIT "EXT3-fs (%s): error: %s: %pV\n",
298 sb->s_id, function, &vaf);
302 if (test_opt(sb, ERRORS_PANIC))
303 panic("EXT3-fs: panic from previous error\n");
305 if (sb->s_flags & MS_RDONLY)
308 ext3_msg(sb, KERN_CRIT,
309 "error: remounting filesystem read-only");
310 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
311 sb->s_flags |= MS_RDONLY;
312 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
313 if (EXT3_SB(sb)->s_journal)
314 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
317 void ext3_warning(struct super_block *sb, const char *function,
318 const char *fmt, ...)
320 struct va_format vaf;
328 printk(KERN_WARNING "EXT3-fs (%s): warning: %s: %pV\n",
329 sb->s_id, function, &vaf);
334 void ext3_update_dynamic_rev(struct super_block *sb)
336 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
338 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
341 ext3_msg(sb, KERN_WARNING,
342 "warning: updating to rev %d because of "
343 "new feature flag, running e2fsck is recommended",
346 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
347 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
348 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
349 /* leave es->s_feature_*compat flags alone */
350 /* es->s_uuid will be set by e2fsck if empty */
353 * The rest of the superblock fields should be zero, and if not it
354 * means they are likely already in use, so leave them alone. We
355 * can leave it up to e2fsck to clean up any inconsistencies there.
360 * Open the external journal device
362 static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
364 struct block_device *bdev;
365 char b[BDEVNAME_SIZE];
367 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
373 ext3_msg(sb, "error: failed to open journal device %s: %ld",
374 __bdevname(dev, b), PTR_ERR(bdev));
380 * Release the journal device
382 static int ext3_blkdev_put(struct block_device *bdev)
384 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
387 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
389 struct block_device *bdev;
392 bdev = sbi->journal_bdev;
394 ret = ext3_blkdev_put(bdev);
395 sbi->journal_bdev = NULL;
400 static inline struct inode *orphan_list_entry(struct list_head *l)
402 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
405 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
409 ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
410 le32_to_cpu(sbi->s_es->s_last_orphan));
412 ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
413 list_for_each(l, &sbi->s_orphan) {
414 struct inode *inode = orphan_list_entry(l);
415 ext3_msg(sb, KERN_ERR, " "
416 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
417 inode->i_sb->s_id, inode->i_ino, inode,
418 inode->i_mode, inode->i_nlink,
423 static void ext3_put_super (struct super_block * sb)
425 struct ext3_sb_info *sbi = EXT3_SB(sb);
426 struct ext3_super_block *es = sbi->s_es;
429 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
430 ext3_xattr_put_super(sb);
431 err = journal_destroy(sbi->s_journal);
432 sbi->s_journal = NULL;
434 ext3_abort(sb, __func__, "Couldn't clean up the journal");
436 if (!(sb->s_flags & MS_RDONLY)) {
437 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
438 es->s_state = cpu_to_le16(sbi->s_mount_state);
439 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
440 mark_buffer_dirty(sbi->s_sbh);
441 ext3_commit_super(sb, es, 1);
444 for (i = 0; i < sbi->s_gdb_count; i++)
445 brelse(sbi->s_group_desc[i]);
446 kfree(sbi->s_group_desc);
447 percpu_counter_destroy(&sbi->s_freeblocks_counter);
448 percpu_counter_destroy(&sbi->s_freeinodes_counter);
449 percpu_counter_destroy(&sbi->s_dirs_counter);
452 for (i = 0; i < MAXQUOTAS; i++)
453 kfree(sbi->s_qf_names[i]);
456 /* Debugging code just in case the in-memory inode orphan list
457 * isn't empty. The on-disk one can be non-empty if we've
458 * detected an error and taken the fs readonly, but the
459 * in-memory list had better be clean by this point. */
460 if (!list_empty(&sbi->s_orphan))
461 dump_orphan_list(sb, sbi);
462 J_ASSERT(list_empty(&sbi->s_orphan));
464 invalidate_bdev(sb->s_bdev);
465 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
467 * Invalidate the journal device's buffers. We don't want them
468 * floating about in memory - the physical journal device may
469 * hotswapped, and it breaks the `ro-after' testing code.
471 sync_blockdev(sbi->journal_bdev);
472 invalidate_bdev(sbi->journal_bdev);
473 ext3_blkdev_remove(sbi);
475 sb->s_fs_info = NULL;
476 kfree(sbi->s_blockgroup_lock);
480 static struct kmem_cache *ext3_inode_cachep;
483 * Called inside transaction, so use GFP_NOFS
485 static struct inode *ext3_alloc_inode(struct super_block *sb)
487 struct ext3_inode_info *ei;
489 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
492 ei->i_block_alloc_info = NULL;
493 ei->vfs_inode.i_version = 1;
494 atomic_set(&ei->i_datasync_tid, 0);
495 atomic_set(&ei->i_sync_tid, 0);
496 return &ei->vfs_inode;
499 static void ext3_i_callback(struct rcu_head *head)
501 struct inode *inode = container_of(head, struct inode, i_rcu);
502 INIT_LIST_HEAD(&inode->i_dentry);
503 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
506 static void ext3_destroy_inode(struct inode *inode)
508 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
509 printk("EXT3 Inode %p: orphan list check failed!\n",
511 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
512 EXT3_I(inode), sizeof(struct ext3_inode_info),
516 call_rcu(&inode->i_rcu, ext3_i_callback);
519 static void init_once(void *foo)
521 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
523 INIT_LIST_HEAD(&ei->i_orphan);
524 #ifdef CONFIG_EXT3_FS_XATTR
525 init_rwsem(&ei->xattr_sem);
527 mutex_init(&ei->truncate_mutex);
528 inode_init_once(&ei->vfs_inode);
531 static int init_inodecache(void)
533 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
534 sizeof(struct ext3_inode_info),
535 0, (SLAB_RECLAIM_ACCOUNT|
538 if (ext3_inode_cachep == NULL)
543 static void destroy_inodecache(void)
545 kmem_cache_destroy(ext3_inode_cachep);
548 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
550 #if defined(CONFIG_QUOTA)
551 struct ext3_sb_info *sbi = EXT3_SB(sb);
553 if (sbi->s_jquota_fmt) {
556 switch (sbi->s_jquota_fmt) {
567 seq_printf(seq, ",jqfmt=%s", fmtname);
570 if (sbi->s_qf_names[USRQUOTA])
571 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
573 if (sbi->s_qf_names[GRPQUOTA])
574 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
576 if (test_opt(sb, USRQUOTA))
577 seq_puts(seq, ",usrquota");
579 if (test_opt(sb, GRPQUOTA))
580 seq_puts(seq, ",grpquota");
584 static char *data_mode_string(unsigned long mode)
587 case EXT3_MOUNT_JOURNAL_DATA:
589 case EXT3_MOUNT_ORDERED_DATA:
591 case EXT3_MOUNT_WRITEBACK_DATA:
599 * - it's set to a non-default value OR
600 * - if the per-sb default is different from the global default
602 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
604 struct super_block *sb = vfs->mnt_sb;
605 struct ext3_sb_info *sbi = EXT3_SB(sb);
606 struct ext3_super_block *es = sbi->s_es;
607 unsigned long def_mount_opts;
609 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
611 if (sbi->s_sb_block != 1)
612 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
613 if (test_opt(sb, MINIX_DF))
614 seq_puts(seq, ",minixdf");
615 if (test_opt(sb, GRPID))
616 seq_puts(seq, ",grpid");
617 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
618 seq_puts(seq, ",nogrpid");
619 if (sbi->s_resuid != EXT3_DEF_RESUID ||
620 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
621 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
623 if (sbi->s_resgid != EXT3_DEF_RESGID ||
624 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
625 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
627 if (test_opt(sb, ERRORS_RO)) {
628 int def_errors = le16_to_cpu(es->s_errors);
630 if (def_errors == EXT3_ERRORS_PANIC ||
631 def_errors == EXT3_ERRORS_CONTINUE) {
632 seq_puts(seq, ",errors=remount-ro");
635 if (test_opt(sb, ERRORS_CONT))
636 seq_puts(seq, ",errors=continue");
637 if (test_opt(sb, ERRORS_PANIC))
638 seq_puts(seq, ",errors=panic");
639 if (test_opt(sb, NO_UID32))
640 seq_puts(seq, ",nouid32");
641 if (test_opt(sb, DEBUG))
642 seq_puts(seq, ",debug");
643 if (test_opt(sb, OLDALLOC))
644 seq_puts(seq, ",oldalloc");
645 #ifdef CONFIG_EXT3_FS_XATTR
646 if (test_opt(sb, XATTR_USER))
647 seq_puts(seq, ",user_xattr");
648 if (!test_opt(sb, XATTR_USER) &&
649 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
650 seq_puts(seq, ",nouser_xattr");
653 #ifdef CONFIG_EXT3_FS_POSIX_ACL
654 if (test_opt(sb, POSIX_ACL))
655 seq_puts(seq, ",acl");
656 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
657 seq_puts(seq, ",noacl");
659 if (!test_opt(sb, RESERVATION))
660 seq_puts(seq, ",noreservation");
661 if (sbi->s_commit_interval) {
662 seq_printf(seq, ",commit=%u",
663 (unsigned) (sbi->s_commit_interval / HZ));
667 * Always display barrier state so it's clear what the status is.
669 seq_puts(seq, ",barrier=");
670 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
671 seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
672 if (test_opt(sb, DATA_ERR_ABORT))
673 seq_puts(seq, ",data_err=abort");
675 if (test_opt(sb, NOLOAD))
676 seq_puts(seq, ",norecovery");
678 ext3_show_quota_options(seq, sb);
684 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
685 u64 ino, u32 generation)
689 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
690 return ERR_PTR(-ESTALE);
691 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
692 return ERR_PTR(-ESTALE);
694 /* iget isn't really right if the inode is currently unallocated!!
696 * ext3_read_inode will return a bad_inode if the inode had been
697 * deleted, so we should be safe.
699 * Currently we don't know the generation for parent directory, so
700 * a generation of 0 means "accept any"
702 inode = ext3_iget(sb, ino);
704 return ERR_CAST(inode);
705 if (generation && inode->i_generation != generation) {
707 return ERR_PTR(-ESTALE);
713 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
714 int fh_len, int fh_type)
716 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
720 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
721 int fh_len, int fh_type)
723 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
728 * Try to release metadata pages (indirect blocks, directories) which are
729 * mapped via the block device. Since these pages could have journal heads
730 * which would prevent try_to_free_buffers() from freeing them, we must use
731 * jbd layer's try_to_free_buffers() function to release them.
733 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
736 journal_t *journal = EXT3_SB(sb)->s_journal;
738 WARN_ON(PageChecked(page));
739 if (!page_has_buffers(page))
742 return journal_try_to_free_buffers(journal, page,
744 return try_to_free_buffers(page);
748 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
749 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
751 static int ext3_write_dquot(struct dquot *dquot);
752 static int ext3_acquire_dquot(struct dquot *dquot);
753 static int ext3_release_dquot(struct dquot *dquot);
754 static int ext3_mark_dquot_dirty(struct dquot *dquot);
755 static int ext3_write_info(struct super_block *sb, int type);
756 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
758 static int ext3_quota_on_mount(struct super_block *sb, int type);
759 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
760 size_t len, loff_t off);
761 static ssize_t ext3_quota_write(struct super_block *sb, int type,
762 const char *data, size_t len, loff_t off);
764 static const struct dquot_operations ext3_quota_operations = {
765 .write_dquot = ext3_write_dquot,
766 .acquire_dquot = ext3_acquire_dquot,
767 .release_dquot = ext3_release_dquot,
768 .mark_dirty = ext3_mark_dquot_dirty,
769 .write_info = ext3_write_info,
770 .alloc_dquot = dquot_alloc,
771 .destroy_dquot = dquot_destroy,
774 static const struct quotactl_ops ext3_qctl_operations = {
775 .quota_on = ext3_quota_on,
776 .quota_off = dquot_quota_off,
777 .quota_sync = dquot_quota_sync,
778 .get_info = dquot_get_dqinfo,
779 .set_info = dquot_set_dqinfo,
780 .get_dqblk = dquot_get_dqblk,
781 .set_dqblk = dquot_set_dqblk
785 static const struct super_operations ext3_sops = {
786 .alloc_inode = ext3_alloc_inode,
787 .destroy_inode = ext3_destroy_inode,
788 .write_inode = ext3_write_inode,
789 .dirty_inode = ext3_dirty_inode,
790 .evict_inode = ext3_evict_inode,
791 .put_super = ext3_put_super,
792 .sync_fs = ext3_sync_fs,
793 .freeze_fs = ext3_freeze,
794 .unfreeze_fs = ext3_unfreeze,
795 .statfs = ext3_statfs,
796 .remount_fs = ext3_remount,
797 .show_options = ext3_show_options,
799 .quota_read = ext3_quota_read,
800 .quota_write = ext3_quota_write,
802 .bdev_try_to_free_page = bdev_try_to_free_page,
805 static const struct export_operations ext3_export_ops = {
806 .fh_to_dentry = ext3_fh_to_dentry,
807 .fh_to_parent = ext3_fh_to_parent,
808 .get_parent = ext3_get_parent,
812 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
813 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
814 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
815 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
816 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
817 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
818 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
819 Opt_data_err_abort, Opt_data_err_ignore,
820 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
821 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
822 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
823 Opt_resize, Opt_usrquota, Opt_grpquota
826 static const match_table_t tokens = {
827 {Opt_bsd_df, "bsddf"},
828 {Opt_minix_df, "minixdf"},
829 {Opt_grpid, "grpid"},
830 {Opt_grpid, "bsdgroups"},
831 {Opt_nogrpid, "nogrpid"},
832 {Opt_nogrpid, "sysvgroups"},
833 {Opt_resgid, "resgid=%u"},
834 {Opt_resuid, "resuid=%u"},
836 {Opt_err_cont, "errors=continue"},
837 {Opt_err_panic, "errors=panic"},
838 {Opt_err_ro, "errors=remount-ro"},
839 {Opt_nouid32, "nouid32"},
840 {Opt_nocheck, "nocheck"},
841 {Opt_nocheck, "check=none"},
842 {Opt_debug, "debug"},
843 {Opt_oldalloc, "oldalloc"},
844 {Opt_orlov, "orlov"},
845 {Opt_user_xattr, "user_xattr"},
846 {Opt_nouser_xattr, "nouser_xattr"},
848 {Opt_noacl, "noacl"},
849 {Opt_reservation, "reservation"},
850 {Opt_noreservation, "noreservation"},
851 {Opt_noload, "noload"},
852 {Opt_noload, "norecovery"},
855 {Opt_commit, "commit=%u"},
856 {Opt_journal_update, "journal=update"},
857 {Opt_journal_inum, "journal=%u"},
858 {Opt_journal_dev, "journal_dev=%u"},
859 {Opt_abort, "abort"},
860 {Opt_data_journal, "data=journal"},
861 {Opt_data_ordered, "data=ordered"},
862 {Opt_data_writeback, "data=writeback"},
863 {Opt_data_err_abort, "data_err=abort"},
864 {Opt_data_err_ignore, "data_err=ignore"},
865 {Opt_offusrjquota, "usrjquota="},
866 {Opt_usrjquota, "usrjquota=%s"},
867 {Opt_offgrpjquota, "grpjquota="},
868 {Opt_grpjquota, "grpjquota=%s"},
869 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
870 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
871 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
872 {Opt_grpquota, "grpquota"},
873 {Opt_noquota, "noquota"},
874 {Opt_quota, "quota"},
875 {Opt_usrquota, "usrquota"},
876 {Opt_barrier, "barrier=%u"},
877 {Opt_barrier, "barrier"},
878 {Opt_nobarrier, "nobarrier"},
879 {Opt_resize, "resize"},
883 static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
885 ext3_fsblk_t sb_block;
886 char *options = (char *) *data;
888 if (!options || strncmp(options, "sb=", 3) != 0)
889 return 1; /* Default location */
891 /*todo: use simple_strtoll with >32bit ext3 */
892 sb_block = simple_strtoul(options, &options, 0);
893 if (*options && *options != ',') {
894 ext3_msg(sb, "error: invalid sb specification: %s",
900 *data = (void *) options;
905 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
907 struct ext3_sb_info *sbi = EXT3_SB(sb);
910 if (sb_any_quota_loaded(sb) &&
911 !sbi->s_qf_names[qtype]) {
912 ext3_msg(sb, KERN_ERR,
913 "Cannot change journaled "
914 "quota options when quota turned on");
917 qname = match_strdup(args);
919 ext3_msg(sb, KERN_ERR,
920 "Not enough memory for storing quotafile name");
923 if (sbi->s_qf_names[qtype] &&
924 strcmp(sbi->s_qf_names[qtype], qname)) {
925 ext3_msg(sb, KERN_ERR,
926 "%s quota file already specified", QTYPE2NAME(qtype));
930 sbi->s_qf_names[qtype] = qname;
931 if (strchr(sbi->s_qf_names[qtype], '/')) {
932 ext3_msg(sb, KERN_ERR,
933 "quotafile must be on filesystem root");
934 kfree(sbi->s_qf_names[qtype]);
935 sbi->s_qf_names[qtype] = NULL;
938 set_opt(sbi->s_mount_opt, QUOTA);
942 static int clear_qf_name(struct super_block *sb, int qtype) {
944 struct ext3_sb_info *sbi = EXT3_SB(sb);
946 if (sb_any_quota_loaded(sb) &&
947 sbi->s_qf_names[qtype]) {
948 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
949 " when quota turned on");
953 * The space will be released later when all options are confirmed
956 sbi->s_qf_names[qtype] = NULL;
961 static int parse_options (char *options, struct super_block *sb,
962 unsigned int *inum, unsigned long *journal_devnum,
963 ext3_fsblk_t *n_blocks_count, int is_remount)
965 struct ext3_sb_info *sbi = EXT3_SB(sb);
967 substring_t args[MAX_OPT_ARGS];
977 while ((p = strsep (&options, ",")) != NULL) {
982 * Initialize args struct so we know whether arg was
983 * found; some options take optional arguments.
985 args[0].to = args[0].from = 0;
986 token = match_token(p, tokens, args);
989 clear_opt (sbi->s_mount_opt, MINIX_DF);
992 set_opt (sbi->s_mount_opt, MINIX_DF);
995 set_opt (sbi->s_mount_opt, GRPID);
998 clear_opt (sbi->s_mount_opt, GRPID);
1001 if (match_int(&args[0], &option))
1003 sbi->s_resuid = option;
1006 if (match_int(&args[0], &option))
1008 sbi->s_resgid = option;
1011 /* handled by get_sb_block() instead of here */
1012 /* *sb_block = match_int(&args[0]); */
1015 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1016 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1017 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1020 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1021 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1022 set_opt (sbi->s_mount_opt, ERRORS_RO);
1025 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1026 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1027 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1030 set_opt (sbi->s_mount_opt, NO_UID32);
1033 clear_opt (sbi->s_mount_opt, CHECK);
1036 set_opt (sbi->s_mount_opt, DEBUG);
1039 set_opt (sbi->s_mount_opt, OLDALLOC);
1042 clear_opt (sbi->s_mount_opt, OLDALLOC);
1044 #ifdef CONFIG_EXT3_FS_XATTR
1045 case Opt_user_xattr:
1046 set_opt (sbi->s_mount_opt, XATTR_USER);
1048 case Opt_nouser_xattr:
1049 clear_opt (sbi->s_mount_opt, XATTR_USER);
1052 case Opt_user_xattr:
1053 case Opt_nouser_xattr:
1054 ext3_msg(sb, KERN_INFO,
1055 "(no)user_xattr options not supported");
1058 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1060 set_opt(sbi->s_mount_opt, POSIX_ACL);
1063 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1068 ext3_msg(sb, KERN_INFO,
1069 "(no)acl options not supported");
1072 case Opt_reservation:
1073 set_opt(sbi->s_mount_opt, RESERVATION);
1075 case Opt_noreservation:
1076 clear_opt(sbi->s_mount_opt, RESERVATION);
1078 case Opt_journal_update:
1080 /* Eventually we will want to be able to create
1081 a journal file here. For now, only allow the
1082 user to specify an existing inode to be the
1085 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1086 "journal on remount");
1089 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1091 case Opt_journal_inum:
1093 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1094 "journal on remount");
1097 if (match_int(&args[0], &option))
1101 case Opt_journal_dev:
1103 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1104 "journal on remount");
1107 if (match_int(&args[0], &option))
1109 *journal_devnum = option;
1112 set_opt (sbi->s_mount_opt, NOLOAD);
1115 if (match_int(&args[0], &option))
1120 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1121 sbi->s_commit_interval = HZ * option;
1123 case Opt_data_journal:
1124 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1126 case Opt_data_ordered:
1127 data_opt = EXT3_MOUNT_ORDERED_DATA;
1129 case Opt_data_writeback:
1130 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1133 if (test_opt(sb, DATA_FLAGS) == data_opt)
1135 ext3_msg(sb, KERN_ERR,
1136 "error: cannot change "
1137 "data mode on remount. The filesystem "
1138 "is mounted in data=%s mode and you "
1139 "try to remount it in data=%s mode.",
1140 data_mode_string(test_opt(sb,
1142 data_mode_string(data_opt));
1145 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1146 sbi->s_mount_opt |= data_opt;
1149 case Opt_data_err_abort:
1150 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1152 case Opt_data_err_ignore:
1153 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1157 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1161 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1164 case Opt_offusrjquota:
1165 if (!clear_qf_name(sb, USRQUOTA))
1168 case Opt_offgrpjquota:
1169 if (!clear_qf_name(sb, GRPQUOTA))
1172 case Opt_jqfmt_vfsold:
1173 qfmt = QFMT_VFS_OLD;
1175 case Opt_jqfmt_vfsv0:
1178 case Opt_jqfmt_vfsv1:
1181 if (sb_any_quota_loaded(sb) &&
1182 sbi->s_jquota_fmt != qfmt) {
1183 ext3_msg(sb, KERN_ERR, "error: cannot change "
1184 "journaled quota options when "
1185 "quota turned on.");
1188 sbi->s_jquota_fmt = qfmt;
1192 set_opt(sbi->s_mount_opt, QUOTA);
1193 set_opt(sbi->s_mount_opt, USRQUOTA);
1196 set_opt(sbi->s_mount_opt, QUOTA);
1197 set_opt(sbi->s_mount_opt, GRPQUOTA);
1200 if (sb_any_quota_loaded(sb)) {
1201 ext3_msg(sb, KERN_ERR, "error: cannot change "
1202 "quota options when quota turned on.");
1205 clear_opt(sbi->s_mount_opt, QUOTA);
1206 clear_opt(sbi->s_mount_opt, USRQUOTA);
1207 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1213 ext3_msg(sb, KERN_ERR,
1214 "error: quota options not supported.");
1218 case Opt_offusrjquota:
1219 case Opt_offgrpjquota:
1220 case Opt_jqfmt_vfsold:
1221 case Opt_jqfmt_vfsv0:
1222 case Opt_jqfmt_vfsv1:
1223 ext3_msg(sb, KERN_ERR,
1224 "error: journaled quota options not "
1231 set_opt(sbi->s_mount_opt, ABORT);
1234 clear_opt(sbi->s_mount_opt, BARRIER);
1238 if (match_int(&args[0], &option))
1241 option = 1; /* No argument, default to 1 */
1243 set_opt(sbi->s_mount_opt, BARRIER);
1245 clear_opt(sbi->s_mount_opt, BARRIER);
1251 ext3_msg(sb, KERN_ERR,
1252 "error: resize option only available "
1256 if (match_int(&args[0], &option) != 0)
1258 *n_blocks_count = option;
1261 ext3_msg(sb, KERN_WARNING,
1262 "warning: ignoring deprecated nobh option");
1265 ext3_msg(sb, KERN_WARNING,
1266 "warning: ignoring deprecated bh option");
1269 ext3_msg(sb, KERN_ERR,
1270 "error: unrecognized mount option \"%s\" "
1271 "or missing value", p);
1276 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1277 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1278 clear_opt(sbi->s_mount_opt, USRQUOTA);
1279 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1280 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1282 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1283 ext3_msg(sb, KERN_ERR, "error: old and new quota "
1288 if (!sbi->s_jquota_fmt) {
1289 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1294 if (sbi->s_jquota_fmt) {
1295 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1296 "specified with no journaling "
1305 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1308 struct ext3_sb_info *sbi = EXT3_SB(sb);
1311 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1312 ext3_msg(sb, KERN_ERR,
1313 "error: revision level too high, "
1314 "forcing read-only mode");
1319 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1320 ext3_msg(sb, KERN_WARNING,
1321 "warning: mounting unchecked fs, "
1322 "running e2fsck is recommended");
1323 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1324 ext3_msg(sb, KERN_WARNING,
1325 "warning: mounting fs with errors, "
1326 "running e2fsck is recommended");
1327 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1328 le16_to_cpu(es->s_mnt_count) >=
1329 le16_to_cpu(es->s_max_mnt_count))
1330 ext3_msg(sb, KERN_WARNING,
1331 "warning: maximal mount count reached, "
1332 "running e2fsck is recommended");
1333 else if (le32_to_cpu(es->s_checkinterval) &&
1334 (le32_to_cpu(es->s_lastcheck) +
1335 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1336 ext3_msg(sb, KERN_WARNING,
1337 "warning: checktime reached, "
1338 "running e2fsck is recommended");
1340 /* @@@ We _will_ want to clear the valid bit if we find
1341 inconsistencies, to force a fsck at reboot. But for
1342 a plain journaled filesystem we can keep it set as
1343 valid forever! :) */
1344 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1346 if (!le16_to_cpu(es->s_max_mnt_count))
1347 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1348 le16_add_cpu(&es->s_mnt_count, 1);
1349 es->s_mtime = cpu_to_le32(get_seconds());
1350 ext3_update_dynamic_rev(sb);
1351 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1353 ext3_commit_super(sb, es, 1);
1354 if (test_opt(sb, DEBUG))
1355 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1356 "bpg=%lu, ipg=%lu, mo=%04lx]",
1358 sbi->s_groups_count,
1359 EXT3_BLOCKS_PER_GROUP(sb),
1360 EXT3_INODES_PER_GROUP(sb),
1363 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1364 char b[BDEVNAME_SIZE];
1365 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1366 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1368 ext3_msg(sb, KERN_INFO, "using internal journal");
1373 /* Called at mount-time, super-block is locked */
1374 static int ext3_check_descriptors(struct super_block *sb)
1376 struct ext3_sb_info *sbi = EXT3_SB(sb);
1379 ext3_debug ("Checking group descriptors");
1381 for (i = 0; i < sbi->s_groups_count; i++) {
1382 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1383 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1384 ext3_fsblk_t last_block;
1386 if (i == sbi->s_groups_count - 1)
1387 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1389 last_block = first_block +
1390 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1392 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1393 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1395 ext3_error (sb, "ext3_check_descriptors",
1396 "Block bitmap for group %d"
1397 " not in group (block %lu)!",
1399 le32_to_cpu(gdp->bg_block_bitmap));
1402 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1403 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1405 ext3_error (sb, "ext3_check_descriptors",
1406 "Inode bitmap for group %d"
1407 " not in group (block %lu)!",
1409 le32_to_cpu(gdp->bg_inode_bitmap));
1412 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1413 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1416 ext3_error (sb, "ext3_check_descriptors",
1417 "Inode table for group %d"
1418 " not in group (block %lu)!",
1420 le32_to_cpu(gdp->bg_inode_table));
1425 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1426 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1431 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1432 * the superblock) which were deleted from all directories, but held open by
1433 * a process at the time of a crash. We walk the list and try to delete these
1434 * inodes at recovery time (only with a read-write filesystem).
1436 * In order to keep the orphan inode chain consistent during traversal (in
1437 * case of crash during recovery), we link each inode into the superblock
1438 * orphan list_head and handle it the same way as an inode deletion during
1439 * normal operation (which journals the operations for us).
1441 * We only do an iget() and an iput() on each inode, which is very safe if we
1442 * accidentally point at an in-use or already deleted inode. The worst that
1443 * can happen in this case is that we get a "bit already cleared" message from
1444 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1445 * e2fsck was run on this filesystem, and it must have already done the orphan
1446 * inode cleanup for us, so we can safely abort without any further action.
1448 static void ext3_orphan_cleanup (struct super_block * sb,
1449 struct ext3_super_block * es)
1451 unsigned int s_flags = sb->s_flags;
1452 int nr_orphans = 0, nr_truncates = 0;
1456 if (!es->s_last_orphan) {
1457 jbd_debug(4, "no orphan inodes to clean up\n");
1461 if (bdev_read_only(sb->s_bdev)) {
1462 ext3_msg(sb, KERN_ERR, "error: write access "
1463 "unavailable, skipping orphan cleanup.");
1467 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1468 if (es->s_last_orphan)
1469 jbd_debug(1, "Errors on filesystem, "
1470 "clearing orphan list.\n");
1471 es->s_last_orphan = 0;
1472 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1476 if (s_flags & MS_RDONLY) {
1477 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1478 sb->s_flags &= ~MS_RDONLY;
1481 /* Needed for iput() to work correctly and not trash data */
1482 sb->s_flags |= MS_ACTIVE;
1483 /* Turn on quotas so that they are updated correctly */
1484 for (i = 0; i < MAXQUOTAS; i++) {
1485 if (EXT3_SB(sb)->s_qf_names[i]) {
1486 int ret = ext3_quota_on_mount(sb, i);
1488 ext3_msg(sb, KERN_ERR,
1489 "error: cannot turn on journaled "
1495 while (es->s_last_orphan) {
1496 struct inode *inode;
1498 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1499 if (IS_ERR(inode)) {
1500 es->s_last_orphan = 0;
1504 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1505 dquot_initialize(inode);
1506 if (inode->i_nlink) {
1508 "%s: truncating inode %lu to %Ld bytes\n",
1509 __func__, inode->i_ino, inode->i_size);
1510 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1511 inode->i_ino, inode->i_size);
1512 ext3_truncate(inode);
1516 "%s: deleting unreferenced inode %lu\n",
1517 __func__, inode->i_ino);
1518 jbd_debug(2, "deleting unreferenced inode %lu\n",
1522 iput(inode); /* The delete magic happens here! */
1525 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1528 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1529 PLURAL(nr_orphans));
1531 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1532 PLURAL(nr_truncates));
1534 /* Turn quotas off */
1535 for (i = 0; i < MAXQUOTAS; i++) {
1536 if (sb_dqopt(sb)->files[i])
1537 dquot_quota_off(sb, i);
1540 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1544 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1545 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1546 * We need to be 1 filesystem block less than the 2^32 sector limit.
1548 static loff_t ext3_max_size(int bits)
1550 loff_t res = EXT3_NDIR_BLOCKS;
1554 /* This is calculated to be the largest file size for a
1555 * dense, file such that the total number of
1556 * sectors in the file, including data and all indirect blocks,
1557 * does not exceed 2^32 -1
1558 * __u32 i_blocks representing the total number of
1559 * 512 bytes blocks of the file
1561 upper_limit = (1LL << 32) - 1;
1563 /* total blocks in file system block size */
1564 upper_limit >>= (bits - 9);
1567 /* indirect blocks */
1569 /* double indirect blocks */
1570 meta_blocks += 1 + (1LL << (bits-2));
1571 /* tripple indirect blocks */
1572 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1574 upper_limit -= meta_blocks;
1575 upper_limit <<= bits;
1577 res += 1LL << (bits-2);
1578 res += 1LL << (2*(bits-2));
1579 res += 1LL << (3*(bits-2));
1581 if (res > upper_limit)
1584 if (res > MAX_LFS_FILESIZE)
1585 res = MAX_LFS_FILESIZE;
1590 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1591 ext3_fsblk_t logic_sb_block,
1594 struct ext3_sb_info *sbi = EXT3_SB(sb);
1595 unsigned long bg, first_meta_bg;
1598 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1600 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1602 return (logic_sb_block + nr + 1);
1603 bg = sbi->s_desc_per_block * nr;
1604 if (ext3_bg_has_super(sb, bg))
1606 return (has_super + ext3_group_first_block_no(sb, bg));
1610 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1612 struct buffer_head * bh;
1613 struct ext3_super_block *es = NULL;
1614 struct ext3_sb_info *sbi;
1616 ext3_fsblk_t sb_block = get_sb_block(&data, sb);
1617 ext3_fsblk_t logic_sb_block;
1618 unsigned long offset = 0;
1619 unsigned int journal_inum = 0;
1620 unsigned long journal_devnum = 0;
1621 unsigned long def_mount_opts;
1632 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1636 sbi->s_blockgroup_lock =
1637 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1638 if (!sbi->s_blockgroup_lock) {
1642 sb->s_fs_info = sbi;
1643 sbi->s_mount_opt = 0;
1644 sbi->s_resuid = EXT3_DEF_RESUID;
1645 sbi->s_resgid = EXT3_DEF_RESGID;
1646 sbi->s_sb_block = sb_block;
1648 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1650 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1655 * The ext3 superblock will not be buffer aligned for other than 1kB
1656 * block sizes. We need to calculate the offset from buffer start.
1658 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1659 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1660 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1662 logic_sb_block = sb_block;
1665 if (!(bh = sb_bread(sb, logic_sb_block))) {
1666 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1670 * Note: s_es must be initialized as soon as possible because
1671 * some ext3 macro-instructions depend on its value
1673 es = (struct ext3_super_block *) (bh->b_data + offset);
1675 sb->s_magic = le16_to_cpu(es->s_magic);
1676 if (sb->s_magic != EXT3_SUPER_MAGIC)
1679 /* Set defaults before we parse the mount options */
1680 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1681 if (def_mount_opts & EXT3_DEFM_DEBUG)
1682 set_opt(sbi->s_mount_opt, DEBUG);
1683 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1684 set_opt(sbi->s_mount_opt, GRPID);
1685 if (def_mount_opts & EXT3_DEFM_UID16)
1686 set_opt(sbi->s_mount_opt, NO_UID32);
1687 #ifdef CONFIG_EXT3_FS_XATTR
1688 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1689 set_opt(sbi->s_mount_opt, XATTR_USER);
1691 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1692 if (def_mount_opts & EXT3_DEFM_ACL)
1693 set_opt(sbi->s_mount_opt, POSIX_ACL);
1695 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1696 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1697 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1698 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1699 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1700 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1702 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1703 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1704 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1705 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1707 set_opt(sbi->s_mount_opt, ERRORS_RO);
1709 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1710 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1712 set_opt(sbi->s_mount_opt, RESERVATION);
1714 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1718 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1719 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1721 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1722 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1723 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1724 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1725 ext3_msg(sb, KERN_WARNING,
1726 "warning: feature flags set on rev 0 fs, "
1727 "running e2fsck is recommended");
1729 * Check feature flags regardless of the revision level, since we
1730 * previously didn't change the revision level when setting the flags,
1731 * so there is a chance incompat flags are set on a rev 0 filesystem.
1733 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1735 ext3_msg(sb, KERN_ERR,
1736 "error: couldn't mount because of unsupported "
1737 "optional features (%x)", le32_to_cpu(features));
1740 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1741 if (!(sb->s_flags & MS_RDONLY) && features) {
1742 ext3_msg(sb, KERN_ERR,
1743 "error: couldn't mount RDWR because of unsupported "
1744 "optional features (%x)", le32_to_cpu(features));
1747 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1749 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1750 blocksize > EXT3_MAX_BLOCK_SIZE) {
1751 ext3_msg(sb, KERN_ERR,
1752 "error: couldn't mount because of unsupported "
1753 "filesystem blocksize %d", blocksize);
1757 hblock = bdev_logical_block_size(sb->s_bdev);
1758 if (sb->s_blocksize != blocksize) {
1760 * Make sure the blocksize for the filesystem is larger
1761 * than the hardware sectorsize for the machine.
1763 if (blocksize < hblock) {
1764 ext3_msg(sb, KERN_ERR,
1765 "error: fsblocksize %d too small for "
1766 "hardware sectorsize %d", blocksize, hblock);
1771 if (!sb_set_blocksize(sb, blocksize)) {
1772 ext3_msg(sb, KERN_ERR,
1773 "error: bad blocksize %d", blocksize);
1776 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1777 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1778 bh = sb_bread(sb, logic_sb_block);
1780 ext3_msg(sb, KERN_ERR,
1781 "error: can't read superblock on 2nd try");
1784 es = (struct ext3_super_block *)(bh->b_data + offset);
1786 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1787 ext3_msg(sb, KERN_ERR,
1788 "error: magic mismatch");
1793 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1795 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1796 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1797 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1799 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1800 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1801 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1802 (!is_power_of_2(sbi->s_inode_size)) ||
1803 (sbi->s_inode_size > blocksize)) {
1804 ext3_msg(sb, KERN_ERR,
1805 "error: unsupported inode size: %d",
1810 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1811 le32_to_cpu(es->s_log_frag_size);
1812 if (blocksize != sbi->s_frag_size) {
1813 ext3_msg(sb, KERN_ERR,
1814 "error: fragsize %lu != blocksize %u (unsupported)",
1815 sbi->s_frag_size, blocksize);
1818 sbi->s_frags_per_block = 1;
1819 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1820 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1821 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1822 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1824 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1825 if (sbi->s_inodes_per_block == 0)
1827 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1828 sbi->s_inodes_per_block;
1829 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1831 sbi->s_mount_state = le16_to_cpu(es->s_state);
1832 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1833 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1834 for (i=0; i < 4; i++)
1835 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1836 sbi->s_def_hash_version = es->s_def_hash_version;
1837 i = le32_to_cpu(es->s_flags);
1838 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1839 sbi->s_hash_unsigned = 3;
1840 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1841 #ifdef __CHAR_UNSIGNED__
1842 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1843 sbi->s_hash_unsigned = 3;
1845 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1849 if (sbi->s_blocks_per_group > blocksize * 8) {
1850 ext3_msg(sb, KERN_ERR,
1851 "#blocks per group too big: %lu",
1852 sbi->s_blocks_per_group);
1855 if (sbi->s_frags_per_group > blocksize * 8) {
1856 ext3_msg(sb, KERN_ERR,
1857 "error: #fragments per group too big: %lu",
1858 sbi->s_frags_per_group);
1861 if (sbi->s_inodes_per_group > blocksize * 8) {
1862 ext3_msg(sb, KERN_ERR,
1863 "error: #inodes per group too big: %lu",
1864 sbi->s_inodes_per_group);
1868 err = generic_check_addressable(sb->s_blocksize_bits,
1869 le32_to_cpu(es->s_blocks_count));
1871 ext3_msg(sb, KERN_ERR,
1872 "error: filesystem is too large to mount safely");
1873 if (sizeof(sector_t) < 8)
1874 ext3_msg(sb, KERN_ERR,
1875 "error: CONFIG_LBDAF not enabled");
1880 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1882 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1883 le32_to_cpu(es->s_first_data_block) - 1)
1884 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1885 db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
1886 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1888 if (sbi->s_group_desc == NULL) {
1889 ext3_msg(sb, KERN_ERR,
1890 "error: not enough memory");
1895 bgl_lock_init(sbi->s_blockgroup_lock);
1897 for (i = 0; i < db_count; i++) {
1898 block = descriptor_loc(sb, logic_sb_block, i);
1899 sbi->s_group_desc[i] = sb_bread(sb, block);
1900 if (!sbi->s_group_desc[i]) {
1901 ext3_msg(sb, KERN_ERR,
1902 "error: can't read group descriptor %d", i);
1907 if (!ext3_check_descriptors (sb)) {
1908 ext3_msg(sb, KERN_ERR,
1909 "error: group descriptors corrupted");
1912 sbi->s_gdb_count = db_count;
1913 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1914 spin_lock_init(&sbi->s_next_gen_lock);
1916 /* per fileystem reservation list head & lock */
1917 spin_lock_init(&sbi->s_rsv_window_lock);
1918 sbi->s_rsv_window_root = RB_ROOT;
1919 /* Add a single, static dummy reservation to the start of the
1920 * reservation window list --- it gives us a placeholder for
1921 * append-at-start-of-list which makes the allocation logic
1922 * _much_ simpler. */
1923 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1924 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1925 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1926 sbi->s_rsv_window_head.rsv_goal_size = 0;
1927 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1930 * set up enough so that it can read an inode
1932 sb->s_op = &ext3_sops;
1933 sb->s_export_op = &ext3_export_ops;
1934 sb->s_xattr = ext3_xattr_handlers;
1936 sb->s_qcop = &ext3_qctl_operations;
1937 sb->dq_op = &ext3_quota_operations;
1939 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1940 mutex_init(&sbi->s_orphan_lock);
1941 mutex_init(&sbi->s_resize_lock);
1945 needs_recovery = (es->s_last_orphan != 0 ||
1946 EXT3_HAS_INCOMPAT_FEATURE(sb,
1947 EXT3_FEATURE_INCOMPAT_RECOVER));
1950 * The first inode we look at is the journal inode. Don't try
1951 * root first: it may be modified in the journal!
1953 if (!test_opt(sb, NOLOAD) &&
1954 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1955 if (ext3_load_journal(sb, es, journal_devnum))
1957 } else if (journal_inum) {
1958 if (ext3_create_journal(sb, es, journal_inum))
1962 ext3_msg(sb, KERN_ERR,
1963 "error: no journal found. "
1964 "mounting ext3 over ext2?");
1967 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1968 ext3_count_free_blocks(sb));
1970 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1971 ext3_count_free_inodes(sb));
1974 err = percpu_counter_init(&sbi->s_dirs_counter,
1975 ext3_count_dirs(sb));
1978 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
1983 /* We have now updated the journal if required, so we can
1984 * validate the data journaling mode. */
1985 switch (test_opt(sb, DATA_FLAGS)) {
1987 /* No mode set, assume a default based on the journal
1988 capabilities: ORDERED_DATA if the journal can
1989 cope, else JOURNAL_DATA */
1990 if (journal_check_available_features
1991 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1992 set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
1994 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1997 case EXT3_MOUNT_ORDERED_DATA:
1998 case EXT3_MOUNT_WRITEBACK_DATA:
1999 if (!journal_check_available_features
2000 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
2001 ext3_msg(sb, KERN_ERR,
2002 "error: journal does not support "
2003 "requested data journaling mode");
2011 * The journal_load will have done any necessary log recovery,
2012 * so we can safely mount the rest of the filesystem now.
2015 root = ext3_iget(sb, EXT3_ROOT_INO);
2017 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
2018 ret = PTR_ERR(root);
2021 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2023 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
2026 sb->s_root = d_alloc_root(root);
2028 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
2034 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
2036 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2037 ext3_orphan_cleanup(sb, es);
2038 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2040 ext3_msg(sb, KERN_INFO, "recovery complete");
2041 ext3_mark_recovery_complete(sb, es);
2042 ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
2043 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2044 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2051 ext3_msg(sb, KERN_INFO,
2052 "error: can't find ext3 filesystem on dev %s.",
2057 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2058 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2059 percpu_counter_destroy(&sbi->s_dirs_counter);
2060 journal_destroy(sbi->s_journal);
2062 for (i = 0; i < db_count; i++)
2063 brelse(sbi->s_group_desc[i]);
2064 kfree(sbi->s_group_desc);
2067 for (i = 0; i < MAXQUOTAS; i++)
2068 kfree(sbi->s_qf_names[i]);
2070 ext3_blkdev_remove(sbi);
2073 sb->s_fs_info = NULL;
2074 kfree(sbi->s_blockgroup_lock);
2080 * Setup any per-fs journal parameters now. We'll do this both on
2081 * initial mount, once the journal has been initialised but before we've
2082 * done any recovery; and again on any subsequent remount.
2084 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2086 struct ext3_sb_info *sbi = EXT3_SB(sb);
2088 if (sbi->s_commit_interval)
2089 journal->j_commit_interval = sbi->s_commit_interval;
2090 /* We could also set up an ext3-specific default for the commit
2091 * interval here, but for now we'll just fall back to the jbd
2094 spin_lock(&journal->j_state_lock);
2095 if (test_opt(sb, BARRIER))
2096 journal->j_flags |= JFS_BARRIER;
2098 journal->j_flags &= ~JFS_BARRIER;
2099 if (test_opt(sb, DATA_ERR_ABORT))
2100 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2102 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2103 spin_unlock(&journal->j_state_lock);
2106 static journal_t *ext3_get_journal(struct super_block *sb,
2107 unsigned int journal_inum)
2109 struct inode *journal_inode;
2112 /* First, test for the existence of a valid inode on disk. Bad
2113 * things happen if we iget() an unused inode, as the subsequent
2114 * iput() will try to delete it. */
2116 journal_inode = ext3_iget(sb, journal_inum);
2117 if (IS_ERR(journal_inode)) {
2118 ext3_msg(sb, KERN_ERR, "error: no journal found");
2121 if (!journal_inode->i_nlink) {
2122 make_bad_inode(journal_inode);
2123 iput(journal_inode);
2124 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
2128 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2129 journal_inode, journal_inode->i_size);
2130 if (!S_ISREG(journal_inode->i_mode)) {
2131 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
2132 iput(journal_inode);
2136 journal = journal_init_inode(journal_inode);
2138 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
2139 iput(journal_inode);
2142 journal->j_private = sb;
2143 ext3_init_journal_params(sb, journal);
2147 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2150 struct buffer_head * bh;
2154 int hblock, blocksize;
2155 ext3_fsblk_t sb_block;
2156 unsigned long offset;
2157 struct ext3_super_block * es;
2158 struct block_device *bdev;
2160 bdev = ext3_blkdev_get(j_dev, sb);
2164 blocksize = sb->s_blocksize;
2165 hblock = bdev_logical_block_size(bdev);
2166 if (blocksize < hblock) {
2167 ext3_msg(sb, KERN_ERR,
2168 "error: blocksize too small for journal device");
2172 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2173 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2174 set_blocksize(bdev, blocksize);
2175 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2176 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2177 "external journal");
2181 es = (struct ext3_super_block *) (bh->b_data + offset);
2182 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2183 !(le32_to_cpu(es->s_feature_incompat) &
2184 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2185 ext3_msg(sb, KERN_ERR, "error: external journal has "
2191 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2192 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
2197 len = le32_to_cpu(es->s_blocks_count);
2198 start = sb_block + 1;
2199 brelse(bh); /* we're done with the superblock */
2201 journal = journal_init_dev(bdev, sb->s_bdev,
2202 start, len, blocksize);
2204 ext3_msg(sb, KERN_ERR,
2205 "error: failed to create device journal");
2208 journal->j_private = sb;
2209 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2210 wait_on_buffer(journal->j_sb_buffer);
2211 if (!buffer_uptodate(journal->j_sb_buffer)) {
2212 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2215 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2216 ext3_msg(sb, KERN_ERR,
2217 "error: external journal has more than one "
2218 "user (unsupported) - %d",
2219 be32_to_cpu(journal->j_superblock->s_nr_users));
2222 EXT3_SB(sb)->journal_bdev = bdev;
2223 ext3_init_journal_params(sb, journal);
2226 journal_destroy(journal);
2228 ext3_blkdev_put(bdev);
2232 static int ext3_load_journal(struct super_block *sb,
2233 struct ext3_super_block *es,
2234 unsigned long journal_devnum)
2237 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2240 int really_read_only;
2242 if (journal_devnum &&
2243 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2244 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2245 "numbers have changed");
2246 journal_dev = new_decode_dev(journal_devnum);
2248 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2250 really_read_only = bdev_read_only(sb->s_bdev);
2253 * Are we loading a blank journal or performing recovery after a
2254 * crash? For recovery, we need to check in advance whether we
2255 * can get read-write access to the device.
2258 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2259 if (sb->s_flags & MS_RDONLY) {
2260 ext3_msg(sb, KERN_INFO,
2261 "recovery required on readonly filesystem");
2262 if (really_read_only) {
2263 ext3_msg(sb, KERN_ERR, "error: write access "
2264 "unavailable, cannot proceed");
2267 ext3_msg(sb, KERN_INFO,
2268 "write access will be enabled during recovery");
2272 if (journal_inum && journal_dev) {
2273 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2274 "and inode journals");
2279 if (!(journal = ext3_get_journal(sb, journal_inum)))
2282 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2286 if (!(journal->j_flags & JFS_BARRIER))
2287 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2289 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2290 err = journal_update_format(journal);
2292 ext3_msg(sb, KERN_ERR, "error updating journal");
2293 journal_destroy(journal);
2298 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2299 err = journal_wipe(journal, !really_read_only);
2301 err = journal_load(journal);
2304 ext3_msg(sb, KERN_ERR, "error loading journal");
2305 journal_destroy(journal);
2309 EXT3_SB(sb)->s_journal = journal;
2310 ext3_clear_journal_err(sb, es);
2312 if (!really_read_only && journal_devnum &&
2313 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2314 es->s_journal_dev = cpu_to_le32(journal_devnum);
2316 /* Make sure we flush the recovery flag to disk. */
2317 ext3_commit_super(sb, es, 1);
2323 static int ext3_create_journal(struct super_block *sb,
2324 struct ext3_super_block *es,
2325 unsigned int journal_inum)
2330 if (sb->s_flags & MS_RDONLY) {
2331 ext3_msg(sb, KERN_ERR,
2332 "error: readonly filesystem when trying to "
2337 journal = ext3_get_journal(sb, journal_inum);
2341 ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
2344 err = journal_create(journal);
2346 ext3_msg(sb, KERN_ERR, "error creating journal");
2347 journal_destroy(journal);
2351 EXT3_SB(sb)->s_journal = journal;
2353 ext3_update_dynamic_rev(sb);
2354 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2355 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2357 es->s_journal_inum = cpu_to_le32(journal_inum);
2359 /* Make sure we flush the recovery flag to disk. */
2360 ext3_commit_super(sb, es, 1);
2365 static int ext3_commit_super(struct super_block *sb,
2366 struct ext3_super_block *es,
2369 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2375 if (buffer_write_io_error(sbh)) {
2377 * Oh, dear. A previous attempt to write the
2378 * superblock failed. This could happen because the
2379 * USB device was yanked out. Or it could happen to
2380 * be a transient write error and maybe the block will
2381 * be remapped. Nothing we can do but to retry the
2382 * write and hope for the best.
2384 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2385 "superblock detected");
2386 clear_buffer_write_io_error(sbh);
2387 set_buffer_uptodate(sbh);
2390 * If the file system is mounted read-only, don't update the
2391 * superblock write time. This avoids updating the superblock
2392 * write time when we are mounting the root file system
2393 * read/only but we need to replay the journal; at that point,
2394 * for people who are east of GMT and who make their clock
2395 * tick in localtime for Windows bug-for-bug compatibility,
2396 * the clock is set in the future, and this will cause e2fsck
2397 * to complain and force a full file system check.
2399 if (!(sb->s_flags & MS_RDONLY))
2400 es->s_wtime = cpu_to_le32(get_seconds());
2401 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2402 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2403 BUFFER_TRACE(sbh, "marking dirty");
2404 mark_buffer_dirty(sbh);
2406 error = sync_dirty_buffer(sbh);
2407 if (buffer_write_io_error(sbh)) {
2408 ext3_msg(sb, KERN_ERR, "I/O error while writing "
2410 clear_buffer_write_io_error(sbh);
2411 set_buffer_uptodate(sbh);
2419 * Have we just finished recovery? If so, and if we are mounting (or
2420 * remounting) the filesystem readonly, then we will end up with a
2421 * consistent fs on disk. Record that fact.
2423 static void ext3_mark_recovery_complete(struct super_block * sb,
2424 struct ext3_super_block * es)
2426 journal_t *journal = EXT3_SB(sb)->s_journal;
2428 journal_lock_updates(journal);
2429 if (journal_flush(journal) < 0)
2432 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2433 sb->s_flags & MS_RDONLY) {
2434 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2435 ext3_commit_super(sb, es, 1);
2439 journal_unlock_updates(journal);
2443 * If we are mounting (or read-write remounting) a filesystem whose journal
2444 * has recorded an error from a previous lifetime, move that error to the
2445 * main filesystem now.
2447 static void ext3_clear_journal_err(struct super_block *sb,
2448 struct ext3_super_block *es)
2454 journal = EXT3_SB(sb)->s_journal;
2457 * Now check for any error status which may have been recorded in the
2458 * journal by a prior ext3_error() or ext3_abort()
2461 j_errno = journal_errno(journal);
2465 errstr = ext3_decode_error(sb, j_errno, nbuf);
2466 ext3_warning(sb, __func__, "Filesystem error recorded "
2467 "from previous mount: %s", errstr);
2468 ext3_warning(sb, __func__, "Marking fs in need of "
2469 "filesystem check.");
2471 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2472 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2473 ext3_commit_super (sb, es, 1);
2475 journal_clear_err(journal);
2480 * Force the running and committing transactions to commit,
2481 * and wait on the commit.
2483 int ext3_force_commit(struct super_block *sb)
2488 if (sb->s_flags & MS_RDONLY)
2491 journal = EXT3_SB(sb)->s_journal;
2492 ret = ext3_journal_force_commit(journal);
2496 static int ext3_sync_fs(struct super_block *sb, int wait)
2500 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2502 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2508 * LVM calls this function before a (read-only) snapshot is created. This
2509 * gives us a chance to flush the journal completely and mark the fs clean.
2511 static int ext3_freeze(struct super_block *sb)
2516 if (!(sb->s_flags & MS_RDONLY)) {
2517 journal = EXT3_SB(sb)->s_journal;
2519 /* Now we set up the journal barrier. */
2520 journal_lock_updates(journal);
2523 * We don't want to clear needs_recovery flag when we failed
2524 * to flush the journal.
2526 error = journal_flush(journal);
2530 /* Journal blocked and flushed, clear needs_recovery flag. */
2531 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2532 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2539 journal_unlock_updates(journal);
2544 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2545 * flag here, even though the filesystem is not technically dirty yet.
2547 static int ext3_unfreeze(struct super_block *sb)
2549 if (!(sb->s_flags & MS_RDONLY)) {
2551 /* Reser the needs_recovery flag before the fs is unlocked. */
2552 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2553 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2555 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2560 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2562 struct ext3_super_block * es;
2563 struct ext3_sb_info *sbi = EXT3_SB(sb);
2564 ext3_fsblk_t n_blocks_count = 0;
2565 unsigned long old_sb_flags;
2566 struct ext3_mount_options old_opts;
2567 int enable_quota = 0;
2573 /* Store the original options */
2575 old_sb_flags = sb->s_flags;
2576 old_opts.s_mount_opt = sbi->s_mount_opt;
2577 old_opts.s_resuid = sbi->s_resuid;
2578 old_opts.s_resgid = sbi->s_resgid;
2579 old_opts.s_commit_interval = sbi->s_commit_interval;
2581 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2582 for (i = 0; i < MAXQUOTAS; i++)
2583 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2587 * Allow the "check" option to be passed as a remount option.
2589 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2594 if (test_opt(sb, ABORT))
2595 ext3_abort(sb, __func__, "Abort forced by user");
2597 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2598 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2602 ext3_init_journal_params(sb, sbi->s_journal);
2604 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2605 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2606 if (test_opt(sb, ABORT)) {
2611 if (*flags & MS_RDONLY) {
2612 err = dquot_suspend(sb, -1);
2617 * First of all, the unconditional stuff we have to do
2618 * to disable replay of the journal when we next remount
2620 sb->s_flags |= MS_RDONLY;
2623 * OK, test if we are remounting a valid rw partition
2624 * readonly, and if so set the rdonly flag and then
2625 * mark the partition as valid again.
2627 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2628 (sbi->s_mount_state & EXT3_VALID_FS))
2629 es->s_state = cpu_to_le16(sbi->s_mount_state);
2631 ext3_mark_recovery_complete(sb, es);
2634 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2635 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2636 ext3_msg(sb, KERN_WARNING,
2637 "warning: couldn't remount RDWR "
2638 "because of unsupported optional "
2639 "features (%x)", le32_to_cpu(ret));
2645 * If we have an unprocessed orphan list hanging
2646 * around from a previously readonly bdev mount,
2647 * require a full umount/remount for now.
2649 if (es->s_last_orphan) {
2650 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
2651 "remount RDWR because of unprocessed "
2652 "orphan inode list. Please "
2653 "umount/remount instead.");
2659 * Mounting a RDONLY partition read-write, so reread
2660 * and store the current valid flag. (It may have
2661 * been changed by e2fsck since we originally mounted
2664 ext3_clear_journal_err(sb, es);
2665 sbi->s_mount_state = le16_to_cpu(es->s_state);
2666 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2668 if (!ext3_setup_super (sb, es, 0))
2669 sb->s_flags &= ~MS_RDONLY;
2674 /* Release old quota file names */
2675 for (i = 0; i < MAXQUOTAS; i++)
2676 if (old_opts.s_qf_names[i] &&
2677 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2678 kfree(old_opts.s_qf_names[i]);
2683 dquot_resume(sb, -1);
2686 sb->s_flags = old_sb_flags;
2687 sbi->s_mount_opt = old_opts.s_mount_opt;
2688 sbi->s_resuid = old_opts.s_resuid;
2689 sbi->s_resgid = old_opts.s_resgid;
2690 sbi->s_commit_interval = old_opts.s_commit_interval;
2692 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2693 for (i = 0; i < MAXQUOTAS; i++) {
2694 if (sbi->s_qf_names[i] &&
2695 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2696 kfree(sbi->s_qf_names[i]);
2697 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2704 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2706 struct super_block *sb = dentry->d_sb;
2707 struct ext3_sb_info *sbi = EXT3_SB(sb);
2708 struct ext3_super_block *es = sbi->s_es;
2711 if (test_opt(sb, MINIX_DF)) {
2712 sbi->s_overhead_last = 0;
2713 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2714 unsigned long ngroups = sbi->s_groups_count, i;
2715 ext3_fsblk_t overhead = 0;
2719 * Compute the overhead (FS structures). This is constant
2720 * for a given filesystem unless the number of block groups
2721 * changes so we cache the previous value until it does.
2725 * All of the blocks before first_data_block are
2728 overhead = le32_to_cpu(es->s_first_data_block);
2731 * Add the overhead attributed to the superblock and
2732 * block group descriptors. If the sparse superblocks
2733 * feature is turned on, then not all groups have this.
2735 for (i = 0; i < ngroups; i++) {
2736 overhead += ext3_bg_has_super(sb, i) +
2737 ext3_bg_num_gdb(sb, i);
2742 * Every block group has an inode bitmap, a block
2743 * bitmap, and an inode table.
2745 overhead += ngroups * (2 + sbi->s_itb_per_group);
2746 sbi->s_overhead_last = overhead;
2748 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2751 buf->f_type = EXT3_SUPER_MAGIC;
2752 buf->f_bsize = sb->s_blocksize;
2753 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2754 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2755 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2756 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2758 buf->f_files = le32_to_cpu(es->s_inodes_count);
2759 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2760 buf->f_namelen = EXT3_NAME_LEN;
2761 fsid = le64_to_cpup((void *)es->s_uuid) ^
2762 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2763 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2764 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2768 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2769 * is locked for write. Otherwise the are possible deadlocks:
2770 * Process 1 Process 2
2771 * ext3_create() quota_sync()
2772 * journal_start() write_dquot()
2773 * dquot_initialize() down(dqio_mutex)
2774 * down(dqio_mutex) journal_start()
2780 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2782 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2785 static int ext3_write_dquot(struct dquot *dquot)
2789 struct inode *inode;
2791 inode = dquot_to_inode(dquot);
2792 handle = ext3_journal_start(inode,
2793 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2795 return PTR_ERR(handle);
2796 ret = dquot_commit(dquot);
2797 err = ext3_journal_stop(handle);
2803 static int ext3_acquire_dquot(struct dquot *dquot)
2808 handle = ext3_journal_start(dquot_to_inode(dquot),
2809 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2811 return PTR_ERR(handle);
2812 ret = dquot_acquire(dquot);
2813 err = ext3_journal_stop(handle);
2819 static int ext3_release_dquot(struct dquot *dquot)
2824 handle = ext3_journal_start(dquot_to_inode(dquot),
2825 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2826 if (IS_ERR(handle)) {
2827 /* Release dquot anyway to avoid endless cycle in dqput() */
2828 dquot_release(dquot);
2829 return PTR_ERR(handle);
2831 ret = dquot_release(dquot);
2832 err = ext3_journal_stop(handle);
2838 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2840 /* Are we journaling quotas? */
2841 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2842 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2843 dquot_mark_dquot_dirty(dquot);
2844 return ext3_write_dquot(dquot);
2846 return dquot_mark_dquot_dirty(dquot);
2850 static int ext3_write_info(struct super_block *sb, int type)
2855 /* Data block + inode block */
2856 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2858 return PTR_ERR(handle);
2859 ret = dquot_commit_info(sb, type);
2860 err = ext3_journal_stop(handle);
2867 * Turn on quotas during mount time - we need to find
2868 * the quota file and such...
2870 static int ext3_quota_on_mount(struct super_block *sb, int type)
2872 return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2873 EXT3_SB(sb)->s_jquota_fmt, type);
2877 * Standard function to be called on quota_on
2879 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2885 if (!test_opt(sb, QUOTA))
2888 err = kern_path(name, LOOKUP_FOLLOW, &path);
2892 /* Quotafile not on the same filesystem? */
2893 if (path.mnt->mnt_sb != sb) {
2897 /* Journaling quota? */
2898 if (EXT3_SB(sb)->s_qf_names[type]) {
2899 /* Quotafile not of fs root? */
2900 if (path.dentry->d_parent != sb->s_root)
2901 ext3_msg(sb, KERN_WARNING,
2902 "warning: Quota file not on filesystem root. "
2903 "Journaled quota will not work.");
2907 * When we journal data on quota file, we have to flush journal to see
2908 * all updates to the file when we bypass pagecache...
2910 if (ext3_should_journal_data(path.dentry->d_inode)) {
2912 * We don't need to lock updates but journal_flush() could
2913 * otherwise be livelocked...
2915 journal_lock_updates(EXT3_SB(sb)->s_journal);
2916 err = journal_flush(EXT3_SB(sb)->s_journal);
2917 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2924 err = dquot_quota_on_path(sb, type, format_id, &path);
2929 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2930 * acquiring the locks... As quota files are never truncated and quota code
2931 * itself serializes the operations (and noone else should touch the files)
2932 * we don't have to be afraid of races */
2933 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2934 size_t len, loff_t off)
2936 struct inode *inode = sb_dqopt(sb)->files[type];
2937 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2939 int offset = off & (sb->s_blocksize - 1);
2942 struct buffer_head *bh;
2943 loff_t i_size = i_size_read(inode);
2947 if (off+len > i_size)
2950 while (toread > 0) {
2951 tocopy = sb->s_blocksize - offset < toread ?
2952 sb->s_blocksize - offset : toread;
2953 bh = ext3_bread(NULL, inode, blk, 0, &err);
2956 if (!bh) /* A hole? */
2957 memset(data, 0, tocopy);
2959 memcpy(data, bh->b_data+offset, tocopy);
2969 /* Write to quotafile (we know the transaction is already started and has
2970 * enough credits) */
2971 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2972 const char *data, size_t len, loff_t off)
2974 struct inode *inode = sb_dqopt(sb)->files[type];
2975 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2977 int offset = off & (sb->s_blocksize - 1);
2978 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2979 struct buffer_head *bh;
2980 handle_t *handle = journal_current_handle();
2983 ext3_msg(sb, KERN_WARNING,
2984 "warning: quota write (off=%llu, len=%llu)"
2985 " cancelled because transaction is not started.",
2986 (unsigned long long)off, (unsigned long long)len);
2991 * Since we account only one data block in transaction credits,
2992 * then it is impossible to cross a block boundary.
2994 if (sb->s_blocksize - offset < len) {
2995 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
2996 " cancelled because not block aligned",
2997 (unsigned long long)off, (unsigned long long)len);
3000 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3001 bh = ext3_bread(handle, inode, blk, 1, &err);
3004 if (journal_quota) {
3005 err = ext3_journal_get_write_access(handle, bh);
3012 memcpy(bh->b_data+offset, data, len);
3013 flush_dcache_page(bh->b_page);
3016 err = ext3_journal_dirty_metadata(handle, bh);
3018 /* Always do at least ordered writes for quotas */
3019 err = ext3_journal_dirty_data(handle, bh);
3020 mark_buffer_dirty(bh);
3025 mutex_unlock(&inode->i_mutex);
3028 if (inode->i_size < off + len) {
3029 i_size_write(inode, off + len);
3030 EXT3_I(inode)->i_disksize = inode->i_size;
3033 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3034 ext3_mark_inode_dirty(handle, inode);
3035 mutex_unlock(&inode->i_mutex);
3041 static struct dentry *ext3_mount(struct file_system_type *fs_type,
3042 int flags, const char *dev_name, void *data)
3044 return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
3047 static struct file_system_type ext3_fs_type = {
3048 .owner = THIS_MODULE,
3050 .mount = ext3_mount,
3051 .kill_sb = kill_block_super,
3052 .fs_flags = FS_REQUIRES_DEV,
3055 static int __init init_ext3_fs(void)
3057 int err = init_ext3_xattr();
3060 err = init_inodecache();
3063 err = register_filesystem(&ext3_fs_type);
3068 destroy_inodecache();
3074 static void __exit exit_ext3_fs(void)
3076 unregister_filesystem(&ext3_fs_type);
3077 destroy_inodecache();
3081 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3082 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3083 MODULE_LICENSE("GPL");
3084 module_init(init_ext3_fs)
3085 module_exit(exit_ext3_fs)