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/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>
31 #include <asm/uaccess.h>
33 #define CREATE_TRACE_POINTS
40 #ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
41 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
43 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
46 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
47 unsigned long journal_devnum);
48 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
50 static int ext3_commit_super(struct super_block *sb,
51 struct ext3_super_block *es,
53 static void ext3_mark_recovery_complete(struct super_block * sb,
54 struct ext3_super_block * es);
55 static void ext3_clear_journal_err(struct super_block * sb,
56 struct ext3_super_block * es);
57 static int ext3_sync_fs(struct super_block *sb, int wait);
58 static const char *ext3_decode_error(struct super_block * sb, int errno,
60 static int ext3_remount (struct super_block * sb, int * flags, char * data);
61 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
62 static int ext3_unfreeze(struct super_block *sb);
63 static int ext3_freeze(struct super_block *sb);
66 * Wrappers for journal_start/end.
68 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
72 if (sb->s_flags & MS_RDONLY)
73 return ERR_PTR(-EROFS);
75 /* Special case here: if the journal has aborted behind our
76 * backs (eg. EIO in the commit thread), then we still need to
77 * take the FS itself readonly cleanly. */
78 journal = EXT3_SB(sb)->s_journal;
79 if (is_journal_aborted(journal)) {
80 ext3_abort(sb, __func__,
81 "Detected aborted journal");
82 return ERR_PTR(-EROFS);
85 return journal_start(journal, nblocks);
88 int __ext3_journal_stop(const char *where, handle_t *handle)
90 struct super_block *sb;
94 sb = handle->h_transaction->t_journal->j_private;
96 rc = journal_stop(handle);
101 __ext3_std_error(sb, where, err);
105 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
106 struct buffer_head *bh, handle_t *handle, int err)
109 const char *errstr = ext3_decode_error(NULL, err, nbuf);
112 BUFFER_TRACE(bh, "abort");
117 if (is_handle_aborted(handle))
120 printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
121 caller, errstr, err_fn);
123 journal_abort_handle(handle);
126 void ext3_msg(struct super_block *sb, const char *prefix,
127 const char *fmt, ...)
129 struct va_format vaf;
137 printk("%sEXT3-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
142 /* Deal with the reporting of failure conditions on a filesystem such as
143 * inconsistencies detected or read IO failures.
145 * On ext2, we can store the error state of the filesystem in the
146 * superblock. That is not possible on ext3, because we may have other
147 * write ordering constraints on the superblock which prevent us from
148 * writing it out straight away; and given that the journal is about to
149 * be aborted, we can't rely on the current, or future, transactions to
150 * write out the superblock safely.
152 * We'll just use the journal_abort() error code to record an error in
153 * the journal instead. On recovery, the journal will complain about
154 * that error until we've noted it down and cleared it.
157 static void ext3_handle_error(struct super_block *sb)
159 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
161 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
162 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
164 if (sb->s_flags & MS_RDONLY)
167 if (!test_opt (sb, ERRORS_CONT)) {
168 journal_t *journal = EXT3_SB(sb)->s_journal;
170 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
172 journal_abort(journal, -EIO);
174 if (test_opt (sb, ERRORS_RO)) {
175 ext3_msg(sb, KERN_CRIT,
176 "error: remounting filesystem read-only");
177 sb->s_flags |= MS_RDONLY;
179 ext3_commit_super(sb, es, 1);
180 if (test_opt(sb, ERRORS_PANIC))
181 panic("EXT3-fs (%s): panic forced after error\n",
185 void ext3_error(struct super_block *sb, const char *function,
186 const char *fmt, ...)
188 struct va_format vaf;
196 printk(KERN_CRIT "EXT3-fs error (device %s): %s: %pV\n",
197 sb->s_id, function, &vaf);
201 ext3_handle_error(sb);
204 static const char *ext3_decode_error(struct super_block * sb, int errno,
211 errstr = "IO failure";
214 errstr = "Out of memory";
217 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
218 errstr = "Journal has aborted";
220 errstr = "Readonly filesystem";
223 /* If the caller passed in an extra buffer for unknown
224 * errors, textualise them now. Else we just return
227 /* Check for truncated error codes... */
228 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
237 /* __ext3_std_error decodes expected errors from journaling functions
238 * automatically and invokes the appropriate error response. */
240 void __ext3_std_error (struct super_block * sb, const char * function,
246 /* Special case: if the error is EROFS, and we're not already
247 * inside a transaction, then there's really no point in logging
249 if (errno == -EROFS && journal_current_handle() == NULL &&
250 (sb->s_flags & MS_RDONLY))
253 errstr = ext3_decode_error(sb, errno, nbuf);
254 ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
256 ext3_handle_error(sb);
260 * ext3_abort is a much stronger failure handler than ext3_error. The
261 * abort function may be used to deal with unrecoverable failures such
262 * as journal IO errors or ENOMEM at a critical moment in log management.
264 * We unconditionally force the filesystem into an ABORT|READONLY state,
265 * unless the error response on the fs has been set to panic in which
266 * case we take the easy way out and panic immediately.
269 void ext3_abort(struct super_block *sb, const char *function,
270 const char *fmt, ...)
272 struct va_format vaf;
280 printk(KERN_CRIT "EXT3-fs (%s): error: %s: %pV\n",
281 sb->s_id, function, &vaf);
285 if (test_opt(sb, ERRORS_PANIC))
286 panic("EXT3-fs: panic from previous error\n");
288 if (sb->s_flags & MS_RDONLY)
291 ext3_msg(sb, KERN_CRIT,
292 "error: remounting filesystem read-only");
293 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
294 sb->s_flags |= MS_RDONLY;
295 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
296 if (EXT3_SB(sb)->s_journal)
297 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
300 void ext3_warning(struct super_block *sb, const char *function,
301 const char *fmt, ...)
303 struct va_format vaf;
311 printk(KERN_WARNING "EXT3-fs (%s): warning: %s: %pV\n",
312 sb->s_id, function, &vaf);
317 void ext3_update_dynamic_rev(struct super_block *sb)
319 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
321 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
324 ext3_msg(sb, KERN_WARNING,
325 "warning: updating to rev %d because of "
326 "new feature flag, running e2fsck is recommended",
329 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
330 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
331 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
332 /* leave es->s_feature_*compat flags alone */
333 /* es->s_uuid will be set by e2fsck if empty */
336 * The rest of the superblock fields should be zero, and if not it
337 * means they are likely already in use, so leave them alone. We
338 * can leave it up to e2fsck to clean up any inconsistencies there.
343 * Open the external journal device
345 static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
347 struct block_device *bdev;
348 char b[BDEVNAME_SIZE];
350 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
356 ext3_msg(sb, KERN_ERR, "error: failed to open journal device %s: %ld",
357 __bdevname(dev, b), PTR_ERR(bdev));
363 * Release the journal device
365 static void ext3_blkdev_put(struct block_device *bdev)
367 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
370 static void ext3_blkdev_remove(struct ext3_sb_info *sbi)
372 struct block_device *bdev;
373 bdev = sbi->journal_bdev;
375 ext3_blkdev_put(bdev);
376 sbi->journal_bdev = NULL;
380 static inline struct inode *orphan_list_entry(struct list_head *l)
382 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
385 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
389 ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
390 le32_to_cpu(sbi->s_es->s_last_orphan));
392 ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
393 list_for_each(l, &sbi->s_orphan) {
394 struct inode *inode = orphan_list_entry(l);
395 ext3_msg(sb, KERN_ERR, " "
396 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
397 inode->i_sb->s_id, inode->i_ino, inode,
398 inode->i_mode, inode->i_nlink,
403 static void ext3_put_super (struct super_block * sb)
405 struct ext3_sb_info *sbi = EXT3_SB(sb);
406 struct ext3_super_block *es = sbi->s_es;
409 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
410 ext3_xattr_put_super(sb);
411 err = journal_destroy(sbi->s_journal);
412 sbi->s_journal = NULL;
414 ext3_abort(sb, __func__, "Couldn't clean up the journal");
416 if (!(sb->s_flags & MS_RDONLY)) {
417 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
418 es->s_state = cpu_to_le16(sbi->s_mount_state);
419 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
420 mark_buffer_dirty(sbi->s_sbh);
421 ext3_commit_super(sb, es, 1);
424 for (i = 0; i < sbi->s_gdb_count; i++)
425 brelse(sbi->s_group_desc[i]);
426 kfree(sbi->s_group_desc);
427 percpu_counter_destroy(&sbi->s_freeblocks_counter);
428 percpu_counter_destroy(&sbi->s_freeinodes_counter);
429 percpu_counter_destroy(&sbi->s_dirs_counter);
432 for (i = 0; i < MAXQUOTAS; i++)
433 kfree(sbi->s_qf_names[i]);
436 /* Debugging code just in case the in-memory inode orphan list
437 * isn't empty. The on-disk one can be non-empty if we've
438 * detected an error and taken the fs readonly, but the
439 * in-memory list had better be clean by this point. */
440 if (!list_empty(&sbi->s_orphan))
441 dump_orphan_list(sb, sbi);
442 J_ASSERT(list_empty(&sbi->s_orphan));
444 invalidate_bdev(sb->s_bdev);
445 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
447 * Invalidate the journal device's buffers. We don't want them
448 * floating about in memory - the physical journal device may
449 * hotswapped, and it breaks the `ro-after' testing code.
451 sync_blockdev(sbi->journal_bdev);
452 invalidate_bdev(sbi->journal_bdev);
453 ext3_blkdev_remove(sbi);
455 sb->s_fs_info = NULL;
456 kfree(sbi->s_blockgroup_lock);
460 static struct kmem_cache *ext3_inode_cachep;
463 * Called inside transaction, so use GFP_NOFS
465 static struct inode *ext3_alloc_inode(struct super_block *sb)
467 struct ext3_inode_info *ei;
469 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
472 ei->i_block_alloc_info = NULL;
473 ei->vfs_inode.i_version = 1;
474 atomic_set(&ei->i_datasync_tid, 0);
475 atomic_set(&ei->i_sync_tid, 0);
476 return &ei->vfs_inode;
479 static int ext3_drop_inode(struct inode *inode)
481 int drop = generic_drop_inode(inode);
483 trace_ext3_drop_inode(inode, drop);
487 static void ext3_i_callback(struct rcu_head *head)
489 struct inode *inode = container_of(head, struct inode, i_rcu);
490 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
493 static void ext3_destroy_inode(struct inode *inode)
495 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
496 printk("EXT3 Inode %p: orphan list check failed!\n",
498 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
499 EXT3_I(inode), sizeof(struct ext3_inode_info),
503 call_rcu(&inode->i_rcu, ext3_i_callback);
506 static void init_once(void *foo)
508 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
510 INIT_LIST_HEAD(&ei->i_orphan);
511 #ifdef CONFIG_EXT3_FS_XATTR
512 init_rwsem(&ei->xattr_sem);
514 mutex_init(&ei->truncate_mutex);
515 inode_init_once(&ei->vfs_inode);
518 static int init_inodecache(void)
520 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
521 sizeof(struct ext3_inode_info),
522 0, (SLAB_RECLAIM_ACCOUNT|
525 if (ext3_inode_cachep == NULL)
530 static void destroy_inodecache(void)
533 * Make sure all delayed rcu free inodes are flushed before we
537 kmem_cache_destroy(ext3_inode_cachep);
540 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
542 #if defined(CONFIG_QUOTA)
543 struct ext3_sb_info *sbi = EXT3_SB(sb);
545 if (sbi->s_jquota_fmt) {
548 switch (sbi->s_jquota_fmt) {
559 seq_printf(seq, ",jqfmt=%s", fmtname);
562 if (sbi->s_qf_names[USRQUOTA])
563 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
565 if (sbi->s_qf_names[GRPQUOTA])
566 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
568 if (test_opt(sb, USRQUOTA))
569 seq_puts(seq, ",usrquota");
571 if (test_opt(sb, GRPQUOTA))
572 seq_puts(seq, ",grpquota");
576 static char *data_mode_string(unsigned long mode)
579 case EXT3_MOUNT_JOURNAL_DATA:
581 case EXT3_MOUNT_ORDERED_DATA:
583 case EXT3_MOUNT_WRITEBACK_DATA:
591 * - it's set to a non-default value OR
592 * - if the per-sb default is different from the global default
594 static int ext3_show_options(struct seq_file *seq, struct dentry *root)
596 struct super_block *sb = root->d_sb;
597 struct ext3_sb_info *sbi = EXT3_SB(sb);
598 struct ext3_super_block *es = sbi->s_es;
599 unsigned long def_mount_opts;
601 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
603 if (sbi->s_sb_block != 1)
604 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
605 if (test_opt(sb, MINIX_DF))
606 seq_puts(seq, ",minixdf");
607 if (test_opt(sb, GRPID))
608 seq_puts(seq, ",grpid");
609 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
610 seq_puts(seq, ",nogrpid");
611 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT3_DEF_RESUID)) ||
612 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
613 seq_printf(seq, ",resuid=%u",
614 from_kuid_munged(&init_user_ns, sbi->s_resuid));
616 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT3_DEF_RESGID)) ||
617 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
618 seq_printf(seq, ",resgid=%u",
619 from_kgid_munged(&init_user_ns, sbi->s_resgid));
621 if (test_opt(sb, ERRORS_RO)) {
622 int def_errors = le16_to_cpu(es->s_errors);
624 if (def_errors == EXT3_ERRORS_PANIC ||
625 def_errors == EXT3_ERRORS_CONTINUE) {
626 seq_puts(seq, ",errors=remount-ro");
629 if (test_opt(sb, ERRORS_CONT))
630 seq_puts(seq, ",errors=continue");
631 if (test_opt(sb, ERRORS_PANIC))
632 seq_puts(seq, ",errors=panic");
633 if (test_opt(sb, NO_UID32))
634 seq_puts(seq, ",nouid32");
635 if (test_opt(sb, DEBUG))
636 seq_puts(seq, ",debug");
637 #ifdef CONFIG_EXT3_FS_XATTR
638 if (test_opt(sb, XATTR_USER))
639 seq_puts(seq, ",user_xattr");
640 if (!test_opt(sb, XATTR_USER) &&
641 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
642 seq_puts(seq, ",nouser_xattr");
645 #ifdef CONFIG_EXT3_FS_POSIX_ACL
646 if (test_opt(sb, POSIX_ACL))
647 seq_puts(seq, ",acl");
648 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
649 seq_puts(seq, ",noacl");
651 if (!test_opt(sb, RESERVATION))
652 seq_puts(seq, ",noreservation");
653 if (sbi->s_commit_interval) {
654 seq_printf(seq, ",commit=%u",
655 (unsigned) (sbi->s_commit_interval / HZ));
659 * Always display barrier state so it's clear what the status is.
661 seq_puts(seq, ",barrier=");
662 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
663 seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
664 if (test_opt(sb, DATA_ERR_ABORT))
665 seq_puts(seq, ",data_err=abort");
667 if (test_opt(sb, NOLOAD))
668 seq_puts(seq, ",norecovery");
670 ext3_show_quota_options(seq, sb);
676 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
677 u64 ino, u32 generation)
681 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
682 return ERR_PTR(-ESTALE);
683 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
684 return ERR_PTR(-ESTALE);
686 /* iget isn't really right if the inode is currently unallocated!!
688 * ext3_read_inode will return a bad_inode if the inode had been
689 * deleted, so we should be safe.
691 * Currently we don't know the generation for parent directory, so
692 * a generation of 0 means "accept any"
694 inode = ext3_iget(sb, ino);
696 return ERR_CAST(inode);
697 if (generation && inode->i_generation != generation) {
699 return ERR_PTR(-ESTALE);
705 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
706 int fh_len, int fh_type)
708 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
712 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
713 int fh_len, int fh_type)
715 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
720 * Try to release metadata pages (indirect blocks, directories) which are
721 * mapped via the block device. Since these pages could have journal heads
722 * which would prevent try_to_free_buffers() from freeing them, we must use
723 * jbd layer's try_to_free_buffers() function to release them.
725 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
728 journal_t *journal = EXT3_SB(sb)->s_journal;
730 WARN_ON(PageChecked(page));
731 if (!page_has_buffers(page))
734 return journal_try_to_free_buffers(journal, page,
736 return try_to_free_buffers(page);
740 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
741 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
743 static int ext3_write_dquot(struct dquot *dquot);
744 static int ext3_acquire_dquot(struct dquot *dquot);
745 static int ext3_release_dquot(struct dquot *dquot);
746 static int ext3_mark_dquot_dirty(struct dquot *dquot);
747 static int ext3_write_info(struct super_block *sb, int type);
748 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
750 static int ext3_quota_on_mount(struct super_block *sb, int type);
751 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
752 size_t len, loff_t off);
753 static ssize_t ext3_quota_write(struct super_block *sb, int type,
754 const char *data, size_t len, loff_t off);
756 static const struct dquot_operations ext3_quota_operations = {
757 .write_dquot = ext3_write_dquot,
758 .acquire_dquot = ext3_acquire_dquot,
759 .release_dquot = ext3_release_dquot,
760 .mark_dirty = ext3_mark_dquot_dirty,
761 .write_info = ext3_write_info,
762 .alloc_dquot = dquot_alloc,
763 .destroy_dquot = dquot_destroy,
766 static const struct quotactl_ops ext3_qctl_operations = {
767 .quota_on = ext3_quota_on,
768 .quota_off = dquot_quota_off,
769 .quota_sync = dquot_quota_sync,
770 .get_info = dquot_get_dqinfo,
771 .set_info = dquot_set_dqinfo,
772 .get_dqblk = dquot_get_dqblk,
773 .set_dqblk = dquot_set_dqblk
777 static const struct super_operations ext3_sops = {
778 .alloc_inode = ext3_alloc_inode,
779 .destroy_inode = ext3_destroy_inode,
780 .write_inode = ext3_write_inode,
781 .dirty_inode = ext3_dirty_inode,
782 .drop_inode = ext3_drop_inode,
783 .evict_inode = ext3_evict_inode,
784 .put_super = ext3_put_super,
785 .sync_fs = ext3_sync_fs,
786 .freeze_fs = ext3_freeze,
787 .unfreeze_fs = ext3_unfreeze,
788 .statfs = ext3_statfs,
789 .remount_fs = ext3_remount,
790 .show_options = ext3_show_options,
792 .quota_read = ext3_quota_read,
793 .quota_write = ext3_quota_write,
795 .bdev_try_to_free_page = bdev_try_to_free_page,
798 static const struct export_operations ext3_export_ops = {
799 .fh_to_dentry = ext3_fh_to_dentry,
800 .fh_to_parent = ext3_fh_to_parent,
801 .get_parent = ext3_get_parent,
805 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
806 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
807 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
808 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
809 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
810 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
811 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
812 Opt_data_err_abort, Opt_data_err_ignore,
813 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
814 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
815 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
816 Opt_resize, Opt_usrquota, Opt_grpquota
819 static const match_table_t tokens = {
820 {Opt_bsd_df, "bsddf"},
821 {Opt_minix_df, "minixdf"},
822 {Opt_grpid, "grpid"},
823 {Opt_grpid, "bsdgroups"},
824 {Opt_nogrpid, "nogrpid"},
825 {Opt_nogrpid, "sysvgroups"},
826 {Opt_resgid, "resgid=%u"},
827 {Opt_resuid, "resuid=%u"},
829 {Opt_err_cont, "errors=continue"},
830 {Opt_err_panic, "errors=panic"},
831 {Opt_err_ro, "errors=remount-ro"},
832 {Opt_nouid32, "nouid32"},
833 {Opt_nocheck, "nocheck"},
834 {Opt_nocheck, "check=none"},
835 {Opt_debug, "debug"},
836 {Opt_oldalloc, "oldalloc"},
837 {Opt_orlov, "orlov"},
838 {Opt_user_xattr, "user_xattr"},
839 {Opt_nouser_xattr, "nouser_xattr"},
841 {Opt_noacl, "noacl"},
842 {Opt_reservation, "reservation"},
843 {Opt_noreservation, "noreservation"},
844 {Opt_noload, "noload"},
845 {Opt_noload, "norecovery"},
848 {Opt_commit, "commit=%u"},
849 {Opt_journal_update, "journal=update"},
850 {Opt_journal_inum, "journal=%u"},
851 {Opt_journal_dev, "journal_dev=%u"},
852 {Opt_abort, "abort"},
853 {Opt_data_journal, "data=journal"},
854 {Opt_data_ordered, "data=ordered"},
855 {Opt_data_writeback, "data=writeback"},
856 {Opt_data_err_abort, "data_err=abort"},
857 {Opt_data_err_ignore, "data_err=ignore"},
858 {Opt_offusrjquota, "usrjquota="},
859 {Opt_usrjquota, "usrjquota=%s"},
860 {Opt_offgrpjquota, "grpjquota="},
861 {Opt_grpjquota, "grpjquota=%s"},
862 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
863 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
864 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
865 {Opt_grpquota, "grpquota"},
866 {Opt_noquota, "noquota"},
867 {Opt_quota, "quota"},
868 {Opt_usrquota, "usrquota"},
869 {Opt_barrier, "barrier=%u"},
870 {Opt_barrier, "barrier"},
871 {Opt_nobarrier, "nobarrier"},
872 {Opt_resize, "resize"},
876 static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
878 ext3_fsblk_t sb_block;
879 char *options = (char *) *data;
881 if (!options || strncmp(options, "sb=", 3) != 0)
882 return 1; /* Default location */
884 /*todo: use simple_strtoll with >32bit ext3 */
885 sb_block = simple_strtoul(options, &options, 0);
886 if (*options && *options != ',') {
887 ext3_msg(sb, KERN_ERR, "error: invalid sb specification: %s",
893 *data = (void *) options;
898 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
900 struct ext3_sb_info *sbi = EXT3_SB(sb);
903 if (sb_any_quota_loaded(sb) &&
904 !sbi->s_qf_names[qtype]) {
905 ext3_msg(sb, KERN_ERR,
906 "Cannot change journaled "
907 "quota options when quota turned on");
910 qname = match_strdup(args);
912 ext3_msg(sb, KERN_ERR,
913 "Not enough memory for storing quotafile name");
916 if (sbi->s_qf_names[qtype]) {
917 int same = !strcmp(sbi->s_qf_names[qtype], qname);
921 ext3_msg(sb, KERN_ERR,
922 "%s quota file already specified",
927 if (strchr(qname, '/')) {
928 ext3_msg(sb, KERN_ERR,
929 "quotafile must be on filesystem root");
933 sbi->s_qf_names[qtype] = qname;
934 set_opt(sbi->s_mount_opt, QUOTA);
938 static int clear_qf_name(struct super_block *sb, int qtype) {
940 struct ext3_sb_info *sbi = EXT3_SB(sb);
942 if (sb_any_quota_loaded(sb) &&
943 sbi->s_qf_names[qtype]) {
944 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
945 " when quota turned on");
948 if (sbi->s_qf_names[qtype]) {
949 kfree(sbi->s_qf_names[qtype]);
950 sbi->s_qf_names[qtype] = NULL;
956 static int parse_options (char *options, struct super_block *sb,
957 unsigned int *inum, unsigned long *journal_devnum,
958 ext3_fsblk_t *n_blocks_count, int is_remount)
960 struct ext3_sb_info *sbi = EXT3_SB(sb);
962 substring_t args[MAX_OPT_ARGS];
974 while ((p = strsep (&options, ",")) != NULL) {
979 * Initialize args struct so we know whether arg was
980 * found; some options take optional arguments.
982 args[0].to = args[0].from = NULL;
983 token = match_token(p, tokens, args);
986 clear_opt (sbi->s_mount_opt, MINIX_DF);
989 set_opt (sbi->s_mount_opt, MINIX_DF);
992 set_opt (sbi->s_mount_opt, GRPID);
995 clear_opt (sbi->s_mount_opt, GRPID);
998 if (match_int(&args[0], &option))
1000 uid = make_kuid(current_user_ns(), option);
1001 if (!uid_valid(uid)) {
1002 ext3_msg(sb, KERN_ERR, "Invalid uid value %d", option);
1006 sbi->s_resuid = uid;
1009 if (match_int(&args[0], &option))
1011 gid = make_kgid(current_user_ns(), option);
1012 if (!gid_valid(gid)) {
1013 ext3_msg(sb, KERN_ERR, "Invalid gid value %d", option);
1016 sbi->s_resgid = gid;
1019 /* handled by get_sb_block() instead of here */
1020 /* *sb_block = match_int(&args[0]); */
1023 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1024 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1025 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1028 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1029 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1030 set_opt (sbi->s_mount_opt, ERRORS_RO);
1033 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1034 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1035 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1038 set_opt (sbi->s_mount_opt, NO_UID32);
1041 clear_opt (sbi->s_mount_opt, CHECK);
1044 set_opt (sbi->s_mount_opt, DEBUG);
1047 ext3_msg(sb, KERN_WARNING,
1048 "Ignoring deprecated oldalloc option");
1051 ext3_msg(sb, KERN_WARNING,
1052 "Ignoring deprecated orlov option");
1054 #ifdef CONFIG_EXT3_FS_XATTR
1055 case Opt_user_xattr:
1056 set_opt (sbi->s_mount_opt, XATTR_USER);
1058 case Opt_nouser_xattr:
1059 clear_opt (sbi->s_mount_opt, XATTR_USER);
1062 case Opt_user_xattr:
1063 case Opt_nouser_xattr:
1064 ext3_msg(sb, KERN_INFO,
1065 "(no)user_xattr options not supported");
1068 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1070 set_opt(sbi->s_mount_opt, POSIX_ACL);
1073 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1078 ext3_msg(sb, KERN_INFO,
1079 "(no)acl options not supported");
1082 case Opt_reservation:
1083 set_opt(sbi->s_mount_opt, RESERVATION);
1085 case Opt_noreservation:
1086 clear_opt(sbi->s_mount_opt, RESERVATION);
1088 case Opt_journal_update:
1090 /* Eventually we will want to be able to create
1091 a journal file here. For now, only allow the
1092 user to specify an existing inode to be the
1095 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1096 "journal on remount");
1099 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1101 case Opt_journal_inum:
1103 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1104 "journal on remount");
1107 if (match_int(&args[0], &option))
1111 case Opt_journal_dev:
1113 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1114 "journal on remount");
1117 if (match_int(&args[0], &option))
1119 *journal_devnum = option;
1122 set_opt (sbi->s_mount_opt, NOLOAD);
1125 if (match_int(&args[0], &option))
1130 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1131 sbi->s_commit_interval = HZ * option;
1133 case Opt_data_journal:
1134 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1136 case Opt_data_ordered:
1137 data_opt = EXT3_MOUNT_ORDERED_DATA;
1139 case Opt_data_writeback:
1140 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1143 if (test_opt(sb, DATA_FLAGS) == data_opt)
1145 ext3_msg(sb, KERN_ERR,
1146 "error: cannot change "
1147 "data mode on remount. The filesystem "
1148 "is mounted in data=%s mode and you "
1149 "try to remount it in data=%s mode.",
1150 data_mode_string(test_opt(sb,
1152 data_mode_string(data_opt));
1155 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1156 sbi->s_mount_opt |= data_opt;
1159 case Opt_data_err_abort:
1160 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1162 case Opt_data_err_ignore:
1163 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1167 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1171 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1174 case Opt_offusrjquota:
1175 if (!clear_qf_name(sb, USRQUOTA))
1178 case Opt_offgrpjquota:
1179 if (!clear_qf_name(sb, GRPQUOTA))
1182 case Opt_jqfmt_vfsold:
1183 qfmt = QFMT_VFS_OLD;
1185 case Opt_jqfmt_vfsv0:
1188 case Opt_jqfmt_vfsv1:
1191 if (sb_any_quota_loaded(sb) &&
1192 sbi->s_jquota_fmt != qfmt) {
1193 ext3_msg(sb, KERN_ERR, "error: cannot change "
1194 "journaled quota options when "
1195 "quota turned on.");
1198 sbi->s_jquota_fmt = qfmt;
1202 set_opt(sbi->s_mount_opt, QUOTA);
1203 set_opt(sbi->s_mount_opt, USRQUOTA);
1206 set_opt(sbi->s_mount_opt, QUOTA);
1207 set_opt(sbi->s_mount_opt, GRPQUOTA);
1210 if (sb_any_quota_loaded(sb)) {
1211 ext3_msg(sb, KERN_ERR, "error: cannot change "
1212 "quota options when quota turned on.");
1215 clear_opt(sbi->s_mount_opt, QUOTA);
1216 clear_opt(sbi->s_mount_opt, USRQUOTA);
1217 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1223 ext3_msg(sb, KERN_ERR,
1224 "error: quota options not supported.");
1228 case Opt_offusrjquota:
1229 case Opt_offgrpjquota:
1230 case Opt_jqfmt_vfsold:
1231 case Opt_jqfmt_vfsv0:
1232 case Opt_jqfmt_vfsv1:
1233 ext3_msg(sb, KERN_ERR,
1234 "error: journaled quota options not "
1241 set_opt(sbi->s_mount_opt, ABORT);
1244 clear_opt(sbi->s_mount_opt, BARRIER);
1248 if (match_int(&args[0], &option))
1251 option = 1; /* No argument, default to 1 */
1253 set_opt(sbi->s_mount_opt, BARRIER);
1255 clear_opt(sbi->s_mount_opt, BARRIER);
1261 ext3_msg(sb, KERN_ERR,
1262 "error: resize option only available "
1266 if (match_int(&args[0], &option) != 0)
1268 *n_blocks_count = option;
1271 ext3_msg(sb, KERN_WARNING,
1272 "warning: ignoring deprecated nobh option");
1275 ext3_msg(sb, KERN_WARNING,
1276 "warning: ignoring deprecated bh option");
1279 ext3_msg(sb, KERN_ERR,
1280 "error: unrecognized mount option \"%s\" "
1281 "or missing value", p);
1286 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1287 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1288 clear_opt(sbi->s_mount_opt, USRQUOTA);
1289 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1290 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1292 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1293 ext3_msg(sb, KERN_ERR, "error: old and new quota "
1298 if (!sbi->s_jquota_fmt) {
1299 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1308 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1311 struct ext3_sb_info *sbi = EXT3_SB(sb);
1314 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1315 ext3_msg(sb, KERN_ERR,
1316 "error: revision level too high, "
1317 "forcing read-only mode");
1322 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1323 ext3_msg(sb, KERN_WARNING,
1324 "warning: mounting unchecked fs, "
1325 "running e2fsck is recommended");
1326 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1327 ext3_msg(sb, KERN_WARNING,
1328 "warning: mounting fs with errors, "
1329 "running e2fsck is recommended");
1330 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1331 le16_to_cpu(es->s_mnt_count) >=
1332 le16_to_cpu(es->s_max_mnt_count))
1333 ext3_msg(sb, KERN_WARNING,
1334 "warning: maximal mount count reached, "
1335 "running e2fsck is recommended");
1336 else if (le32_to_cpu(es->s_checkinterval) &&
1337 (le32_to_cpu(es->s_lastcheck) +
1338 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1339 ext3_msg(sb, KERN_WARNING,
1340 "warning: checktime reached, "
1341 "running e2fsck is recommended");
1343 /* @@@ We _will_ want to clear the valid bit if we find
1344 inconsistencies, to force a fsck at reboot. But for
1345 a plain journaled filesystem we can keep it set as
1346 valid forever! :) */
1347 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1349 if (!le16_to_cpu(es->s_max_mnt_count))
1350 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1351 le16_add_cpu(&es->s_mnt_count, 1);
1352 es->s_mtime = cpu_to_le32(get_seconds());
1353 ext3_update_dynamic_rev(sb);
1354 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1356 ext3_commit_super(sb, es, 1);
1357 if (test_opt(sb, DEBUG))
1358 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1359 "bpg=%lu, ipg=%lu, mo=%04lx]",
1361 sbi->s_groups_count,
1362 EXT3_BLOCKS_PER_GROUP(sb),
1363 EXT3_INODES_PER_GROUP(sb),
1366 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1367 char b[BDEVNAME_SIZE];
1368 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1369 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1371 ext3_msg(sb, KERN_INFO, "using internal journal");
1373 cleancache_init_fs(sb);
1377 /* Called at mount-time, super-block is locked */
1378 static int ext3_check_descriptors(struct super_block *sb)
1380 struct ext3_sb_info *sbi = EXT3_SB(sb);
1383 ext3_debug ("Checking group descriptors");
1385 for (i = 0; i < sbi->s_groups_count; i++) {
1386 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1387 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1388 ext3_fsblk_t last_block;
1390 if (i == sbi->s_groups_count - 1)
1391 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1393 last_block = first_block +
1394 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1396 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1397 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1399 ext3_error (sb, "ext3_check_descriptors",
1400 "Block bitmap for group %d"
1401 " not in group (block %lu)!",
1403 le32_to_cpu(gdp->bg_block_bitmap));
1406 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1407 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1409 ext3_error (sb, "ext3_check_descriptors",
1410 "Inode bitmap for group %d"
1411 " not in group (block %lu)!",
1413 le32_to_cpu(gdp->bg_inode_bitmap));
1416 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1417 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1420 ext3_error (sb, "ext3_check_descriptors",
1421 "Inode table for group %d"
1422 " not in group (block %lu)!",
1424 le32_to_cpu(gdp->bg_inode_table));
1429 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1430 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1435 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1436 * the superblock) which were deleted from all directories, but held open by
1437 * a process at the time of a crash. We walk the list and try to delete these
1438 * inodes at recovery time (only with a read-write filesystem).
1440 * In order to keep the orphan inode chain consistent during traversal (in
1441 * case of crash during recovery), we link each inode into the superblock
1442 * orphan list_head and handle it the same way as an inode deletion during
1443 * normal operation (which journals the operations for us).
1445 * We only do an iget() and an iput() on each inode, which is very safe if we
1446 * accidentally point at an in-use or already deleted inode. The worst that
1447 * can happen in this case is that we get a "bit already cleared" message from
1448 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1449 * e2fsck was run on this filesystem, and it must have already done the orphan
1450 * inode cleanup for us, so we can safely abort without any further action.
1452 static void ext3_orphan_cleanup (struct super_block * sb,
1453 struct ext3_super_block * es)
1455 unsigned int s_flags = sb->s_flags;
1456 int nr_orphans = 0, nr_truncates = 0;
1460 if (!es->s_last_orphan) {
1461 jbd_debug(4, "no orphan inodes to clean up\n");
1465 if (bdev_read_only(sb->s_bdev)) {
1466 ext3_msg(sb, KERN_ERR, "error: write access "
1467 "unavailable, skipping orphan cleanup.");
1471 /* Check if feature set allows readwrite operations */
1472 if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) {
1473 ext3_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
1474 "unknown ROCOMPAT features");
1478 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1479 /* don't clear list on RO mount w/ errors */
1480 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
1481 jbd_debug(1, "Errors on filesystem, "
1482 "clearing orphan list.\n");
1483 es->s_last_orphan = 0;
1485 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1489 if (s_flags & MS_RDONLY) {
1490 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1491 sb->s_flags &= ~MS_RDONLY;
1494 /* Needed for iput() to work correctly and not trash data */
1495 sb->s_flags |= MS_ACTIVE;
1496 /* Turn on quotas so that they are updated correctly */
1497 for (i = 0; i < MAXQUOTAS; i++) {
1498 if (EXT3_SB(sb)->s_qf_names[i]) {
1499 int ret = ext3_quota_on_mount(sb, i);
1501 ext3_msg(sb, KERN_ERR,
1502 "error: cannot turn on journaled "
1508 while (es->s_last_orphan) {
1509 struct inode *inode;
1511 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1512 if (IS_ERR(inode)) {
1513 es->s_last_orphan = 0;
1517 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1518 dquot_initialize(inode);
1519 if (inode->i_nlink) {
1521 "%s: truncating inode %lu to %Ld bytes\n",
1522 __func__, inode->i_ino, inode->i_size);
1523 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1524 inode->i_ino, inode->i_size);
1525 ext3_truncate(inode);
1529 "%s: deleting unreferenced inode %lu\n",
1530 __func__, inode->i_ino);
1531 jbd_debug(2, "deleting unreferenced inode %lu\n",
1535 iput(inode); /* The delete magic happens here! */
1538 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1541 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1542 PLURAL(nr_orphans));
1544 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1545 PLURAL(nr_truncates));
1547 /* Turn quotas off */
1548 for (i = 0; i < MAXQUOTAS; i++) {
1549 if (sb_dqopt(sb)->files[i])
1550 dquot_quota_off(sb, i);
1553 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1557 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1558 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1559 * We need to be 1 filesystem block less than the 2^32 sector limit.
1561 static loff_t ext3_max_size(int bits)
1563 loff_t res = EXT3_NDIR_BLOCKS;
1567 /* This is calculated to be the largest file size for a
1568 * dense, file such that the total number of
1569 * sectors in the file, including data and all indirect blocks,
1570 * does not exceed 2^32 -1
1571 * __u32 i_blocks representing the total number of
1572 * 512 bytes blocks of the file
1574 upper_limit = (1LL << 32) - 1;
1576 /* total blocks in file system block size */
1577 upper_limit >>= (bits - 9);
1580 /* indirect blocks */
1582 /* double indirect blocks */
1583 meta_blocks += 1 + (1LL << (bits-2));
1584 /* tripple indirect blocks */
1585 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1587 upper_limit -= meta_blocks;
1588 upper_limit <<= bits;
1590 res += 1LL << (bits-2);
1591 res += 1LL << (2*(bits-2));
1592 res += 1LL << (3*(bits-2));
1594 if (res > upper_limit)
1597 if (res > MAX_LFS_FILESIZE)
1598 res = MAX_LFS_FILESIZE;
1603 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1604 ext3_fsblk_t logic_sb_block,
1607 struct ext3_sb_info *sbi = EXT3_SB(sb);
1608 unsigned long bg, first_meta_bg;
1611 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1613 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1615 return (logic_sb_block + nr + 1);
1616 bg = sbi->s_desc_per_block * nr;
1617 if (ext3_bg_has_super(sb, bg))
1619 return (has_super + ext3_group_first_block_no(sb, bg));
1623 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1625 struct buffer_head * bh;
1626 struct ext3_super_block *es = NULL;
1627 struct ext3_sb_info *sbi;
1629 ext3_fsblk_t sb_block = get_sb_block(&data, sb);
1630 ext3_fsblk_t logic_sb_block;
1631 unsigned long offset = 0;
1632 unsigned int journal_inum = 0;
1633 unsigned long journal_devnum = 0;
1634 unsigned long def_mount_opts;
1645 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1649 sbi->s_blockgroup_lock =
1650 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1651 if (!sbi->s_blockgroup_lock) {
1655 sb->s_fs_info = sbi;
1656 sbi->s_sb_block = sb_block;
1658 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1660 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1665 * The ext3 superblock will not be buffer aligned for other than 1kB
1666 * block sizes. We need to calculate the offset from buffer start.
1668 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1669 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1670 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1672 logic_sb_block = sb_block;
1675 if (!(bh = sb_bread(sb, logic_sb_block))) {
1676 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1680 * Note: s_es must be initialized as soon as possible because
1681 * some ext3 macro-instructions depend on its value
1683 es = (struct ext3_super_block *) (bh->b_data + offset);
1685 sb->s_magic = le16_to_cpu(es->s_magic);
1686 if (sb->s_magic != EXT3_SUPER_MAGIC)
1689 /* Set defaults before we parse the mount options */
1690 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1691 if (def_mount_opts & EXT3_DEFM_DEBUG)
1692 set_opt(sbi->s_mount_opt, DEBUG);
1693 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1694 set_opt(sbi->s_mount_opt, GRPID);
1695 if (def_mount_opts & EXT3_DEFM_UID16)
1696 set_opt(sbi->s_mount_opt, NO_UID32);
1697 #ifdef CONFIG_EXT3_FS_XATTR
1698 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1699 set_opt(sbi->s_mount_opt, XATTR_USER);
1701 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1702 if (def_mount_opts & EXT3_DEFM_ACL)
1703 set_opt(sbi->s_mount_opt, POSIX_ACL);
1705 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1706 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1707 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1708 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1709 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1710 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1712 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1713 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1714 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1715 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1717 set_opt(sbi->s_mount_opt, ERRORS_RO);
1719 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
1720 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
1722 /* enable barriers by default */
1723 set_opt(sbi->s_mount_opt, BARRIER);
1724 set_opt(sbi->s_mount_opt, RESERVATION);
1726 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1730 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1731 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1733 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1734 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1735 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1736 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1737 ext3_msg(sb, KERN_WARNING,
1738 "warning: feature flags set on rev 0 fs, "
1739 "running e2fsck is recommended");
1741 * Check feature flags regardless of the revision level, since we
1742 * previously didn't change the revision level when setting the flags,
1743 * so there is a chance incompat flags are set on a rev 0 filesystem.
1745 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1747 ext3_msg(sb, KERN_ERR,
1748 "error: couldn't mount because of unsupported "
1749 "optional features (%x)", le32_to_cpu(features));
1752 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1753 if (!(sb->s_flags & MS_RDONLY) && features) {
1754 ext3_msg(sb, KERN_ERR,
1755 "error: couldn't mount RDWR because of unsupported "
1756 "optional features (%x)", le32_to_cpu(features));
1759 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1761 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1762 blocksize > EXT3_MAX_BLOCK_SIZE) {
1763 ext3_msg(sb, KERN_ERR,
1764 "error: couldn't mount because of unsupported "
1765 "filesystem blocksize %d", blocksize);
1769 hblock = bdev_logical_block_size(sb->s_bdev);
1770 if (sb->s_blocksize != blocksize) {
1772 * Make sure the blocksize for the filesystem is larger
1773 * than the hardware sectorsize for the machine.
1775 if (blocksize < hblock) {
1776 ext3_msg(sb, KERN_ERR,
1777 "error: fsblocksize %d too small for "
1778 "hardware sectorsize %d", blocksize, hblock);
1783 if (!sb_set_blocksize(sb, blocksize)) {
1784 ext3_msg(sb, KERN_ERR,
1785 "error: bad blocksize %d", blocksize);
1788 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1789 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1790 bh = sb_bread(sb, logic_sb_block);
1792 ext3_msg(sb, KERN_ERR,
1793 "error: can't read superblock on 2nd try");
1796 es = (struct ext3_super_block *)(bh->b_data + offset);
1798 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1799 ext3_msg(sb, KERN_ERR,
1800 "error: magic mismatch");
1805 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1807 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1808 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1809 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1811 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1812 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1813 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1814 (!is_power_of_2(sbi->s_inode_size)) ||
1815 (sbi->s_inode_size > blocksize)) {
1816 ext3_msg(sb, KERN_ERR,
1817 "error: unsupported inode size: %d",
1822 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1823 le32_to_cpu(es->s_log_frag_size);
1824 if (blocksize != sbi->s_frag_size) {
1825 ext3_msg(sb, KERN_ERR,
1826 "error: fragsize %lu != blocksize %u (unsupported)",
1827 sbi->s_frag_size, blocksize);
1830 sbi->s_frags_per_block = 1;
1831 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1832 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1833 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1834 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1836 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1837 if (sbi->s_inodes_per_block == 0)
1839 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1840 sbi->s_inodes_per_block;
1841 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1843 sbi->s_mount_state = le16_to_cpu(es->s_state);
1844 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1845 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1846 for (i=0; i < 4; i++)
1847 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1848 sbi->s_def_hash_version = es->s_def_hash_version;
1849 i = le32_to_cpu(es->s_flags);
1850 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1851 sbi->s_hash_unsigned = 3;
1852 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1853 #ifdef __CHAR_UNSIGNED__
1854 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1855 sbi->s_hash_unsigned = 3;
1857 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1861 if (sbi->s_blocks_per_group > blocksize * 8) {
1862 ext3_msg(sb, KERN_ERR,
1863 "#blocks per group too big: %lu",
1864 sbi->s_blocks_per_group);
1867 if (sbi->s_frags_per_group > blocksize * 8) {
1868 ext3_msg(sb, KERN_ERR,
1869 "error: #fragments per group too big: %lu",
1870 sbi->s_frags_per_group);
1873 if (sbi->s_inodes_per_group > blocksize * 8) {
1874 ext3_msg(sb, KERN_ERR,
1875 "error: #inodes per group too big: %lu",
1876 sbi->s_inodes_per_group);
1880 err = generic_check_addressable(sb->s_blocksize_bits,
1881 le32_to_cpu(es->s_blocks_count));
1883 ext3_msg(sb, KERN_ERR,
1884 "error: filesystem is too large to mount safely");
1885 if (sizeof(sector_t) < 8)
1886 ext3_msg(sb, KERN_ERR,
1887 "error: CONFIG_LBDAF not enabled");
1892 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1894 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1895 le32_to_cpu(es->s_first_data_block) - 1)
1896 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1897 db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
1898 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1900 if (sbi->s_group_desc == NULL) {
1901 ext3_msg(sb, KERN_ERR,
1902 "error: not enough memory");
1907 bgl_lock_init(sbi->s_blockgroup_lock);
1909 for (i = 0; i < db_count; i++) {
1910 block = descriptor_loc(sb, logic_sb_block, i);
1911 sbi->s_group_desc[i] = sb_bread(sb, block);
1912 if (!sbi->s_group_desc[i]) {
1913 ext3_msg(sb, KERN_ERR,
1914 "error: can't read group descriptor %d", i);
1919 if (!ext3_check_descriptors (sb)) {
1920 ext3_msg(sb, KERN_ERR,
1921 "error: group descriptors corrupted");
1924 sbi->s_gdb_count = db_count;
1925 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1926 spin_lock_init(&sbi->s_next_gen_lock);
1928 /* per fileystem reservation list head & lock */
1929 spin_lock_init(&sbi->s_rsv_window_lock);
1930 sbi->s_rsv_window_root = RB_ROOT;
1931 /* Add a single, static dummy reservation to the start of the
1932 * reservation window list --- it gives us a placeholder for
1933 * append-at-start-of-list which makes the allocation logic
1934 * _much_ simpler. */
1935 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1936 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1937 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1938 sbi->s_rsv_window_head.rsv_goal_size = 0;
1939 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1942 * set up enough so that it can read an inode
1944 sb->s_op = &ext3_sops;
1945 sb->s_export_op = &ext3_export_ops;
1946 sb->s_xattr = ext3_xattr_handlers;
1948 sb->s_qcop = &ext3_qctl_operations;
1949 sb->dq_op = &ext3_quota_operations;
1951 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
1952 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1953 mutex_init(&sbi->s_orphan_lock);
1954 mutex_init(&sbi->s_resize_lock);
1958 needs_recovery = (es->s_last_orphan != 0 ||
1959 EXT3_HAS_INCOMPAT_FEATURE(sb,
1960 EXT3_FEATURE_INCOMPAT_RECOVER));
1963 * The first inode we look at is the journal inode. Don't try
1964 * root first: it may be modified in the journal!
1966 if (!test_opt(sb, NOLOAD) &&
1967 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1968 if (ext3_load_journal(sb, es, journal_devnum))
1970 } else if (journal_inum) {
1971 if (ext3_create_journal(sb, es, journal_inum))
1975 ext3_msg(sb, KERN_ERR,
1976 "error: no journal found. "
1977 "mounting ext3 over ext2?");
1980 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1981 ext3_count_free_blocks(sb));
1983 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1984 ext3_count_free_inodes(sb));
1987 err = percpu_counter_init(&sbi->s_dirs_counter,
1988 ext3_count_dirs(sb));
1991 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
1996 /* We have now updated the journal if required, so we can
1997 * validate the data journaling mode. */
1998 switch (test_opt(sb, DATA_FLAGS)) {
2000 /* No mode set, assume a default based on the journal
2001 capabilities: ORDERED_DATA if the journal can
2002 cope, else JOURNAL_DATA */
2003 if (journal_check_available_features
2004 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
2005 set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
2007 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2010 case EXT3_MOUNT_ORDERED_DATA:
2011 case EXT3_MOUNT_WRITEBACK_DATA:
2012 if (!journal_check_available_features
2013 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
2014 ext3_msg(sb, KERN_ERR,
2015 "error: journal does not support "
2016 "requested data journaling mode");
2024 * The journal_load will have done any necessary log recovery,
2025 * so we can safely mount the rest of the filesystem now.
2028 root = ext3_iget(sb, EXT3_ROOT_INO);
2030 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
2031 ret = PTR_ERR(root);
2034 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2036 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
2039 sb->s_root = d_make_root(root);
2041 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
2046 if (ext3_setup_super(sb, es, sb->s_flags & MS_RDONLY))
2047 sb->s_flags |= MS_RDONLY;
2049 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2050 ext3_orphan_cleanup(sb, es);
2051 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2052 if (needs_recovery) {
2053 ext3_mark_recovery_complete(sb, es);
2054 ext3_msg(sb, KERN_INFO, "recovery complete");
2056 ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
2057 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2058 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2065 ext3_msg(sb, KERN_INFO,
2066 "error: can't find ext3 filesystem on dev %s.",
2071 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2072 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2073 percpu_counter_destroy(&sbi->s_dirs_counter);
2074 journal_destroy(sbi->s_journal);
2076 for (i = 0; i < db_count; i++)
2077 brelse(sbi->s_group_desc[i]);
2078 kfree(sbi->s_group_desc);
2081 for (i = 0; i < MAXQUOTAS; i++)
2082 kfree(sbi->s_qf_names[i]);
2084 ext3_blkdev_remove(sbi);
2087 sb->s_fs_info = NULL;
2088 kfree(sbi->s_blockgroup_lock);
2094 * Setup any per-fs journal parameters now. We'll do this both on
2095 * initial mount, once the journal has been initialised but before we've
2096 * done any recovery; and again on any subsequent remount.
2098 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2100 struct ext3_sb_info *sbi = EXT3_SB(sb);
2102 if (sbi->s_commit_interval)
2103 journal->j_commit_interval = sbi->s_commit_interval;
2104 /* We could also set up an ext3-specific default for the commit
2105 * interval here, but for now we'll just fall back to the jbd
2108 spin_lock(&journal->j_state_lock);
2109 if (test_opt(sb, BARRIER))
2110 journal->j_flags |= JFS_BARRIER;
2112 journal->j_flags &= ~JFS_BARRIER;
2113 if (test_opt(sb, DATA_ERR_ABORT))
2114 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2116 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2117 spin_unlock(&journal->j_state_lock);
2120 static journal_t *ext3_get_journal(struct super_block *sb,
2121 unsigned int journal_inum)
2123 struct inode *journal_inode;
2126 /* First, test for the existence of a valid inode on disk. Bad
2127 * things happen if we iget() an unused inode, as the subsequent
2128 * iput() will try to delete it. */
2130 journal_inode = ext3_iget(sb, journal_inum);
2131 if (IS_ERR(journal_inode)) {
2132 ext3_msg(sb, KERN_ERR, "error: no journal found");
2135 if (!journal_inode->i_nlink) {
2136 make_bad_inode(journal_inode);
2137 iput(journal_inode);
2138 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
2142 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2143 journal_inode, journal_inode->i_size);
2144 if (!S_ISREG(journal_inode->i_mode)) {
2145 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
2146 iput(journal_inode);
2150 journal = journal_init_inode(journal_inode);
2152 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
2153 iput(journal_inode);
2156 journal->j_private = sb;
2157 ext3_init_journal_params(sb, journal);
2161 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2164 struct buffer_head * bh;
2168 int hblock, blocksize;
2169 ext3_fsblk_t sb_block;
2170 unsigned long offset;
2171 struct ext3_super_block * es;
2172 struct block_device *bdev;
2174 bdev = ext3_blkdev_get(j_dev, sb);
2178 blocksize = sb->s_blocksize;
2179 hblock = bdev_logical_block_size(bdev);
2180 if (blocksize < hblock) {
2181 ext3_msg(sb, KERN_ERR,
2182 "error: blocksize too small for journal device");
2186 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2187 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2188 set_blocksize(bdev, blocksize);
2189 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2190 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2191 "external journal");
2195 es = (struct ext3_super_block *) (bh->b_data + offset);
2196 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2197 !(le32_to_cpu(es->s_feature_incompat) &
2198 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2199 ext3_msg(sb, KERN_ERR, "error: external journal has "
2205 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2206 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
2211 len = le32_to_cpu(es->s_blocks_count);
2212 start = sb_block + 1;
2213 brelse(bh); /* we're done with the superblock */
2215 journal = journal_init_dev(bdev, sb->s_bdev,
2216 start, len, blocksize);
2218 ext3_msg(sb, KERN_ERR,
2219 "error: failed to create device journal");
2222 journal->j_private = sb;
2223 if (!bh_uptodate_or_lock(journal->j_sb_buffer)) {
2224 if (bh_submit_read(journal->j_sb_buffer)) {
2225 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2229 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2230 ext3_msg(sb, KERN_ERR,
2231 "error: external journal has more than one "
2232 "user (unsupported) - %d",
2233 be32_to_cpu(journal->j_superblock->s_nr_users));
2236 EXT3_SB(sb)->journal_bdev = bdev;
2237 ext3_init_journal_params(sb, journal);
2240 journal_destroy(journal);
2242 ext3_blkdev_put(bdev);
2246 static int ext3_load_journal(struct super_block *sb,
2247 struct ext3_super_block *es,
2248 unsigned long journal_devnum)
2251 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2254 int really_read_only;
2256 if (journal_devnum &&
2257 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2258 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2259 "numbers have changed");
2260 journal_dev = new_decode_dev(journal_devnum);
2262 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2264 really_read_only = bdev_read_only(sb->s_bdev);
2267 * Are we loading a blank journal or performing recovery after a
2268 * crash? For recovery, we need to check in advance whether we
2269 * can get read-write access to the device.
2272 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2273 if (sb->s_flags & MS_RDONLY) {
2274 ext3_msg(sb, KERN_INFO,
2275 "recovery required on readonly filesystem");
2276 if (really_read_only) {
2277 ext3_msg(sb, KERN_ERR, "error: write access "
2278 "unavailable, cannot proceed");
2281 ext3_msg(sb, KERN_INFO,
2282 "write access will be enabled during recovery");
2286 if (journal_inum && journal_dev) {
2287 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2288 "and inode journals");
2293 if (!(journal = ext3_get_journal(sb, journal_inum)))
2296 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2300 if (!(journal->j_flags & JFS_BARRIER))
2301 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2303 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2304 err = journal_update_format(journal);
2306 ext3_msg(sb, KERN_ERR, "error updating journal");
2307 journal_destroy(journal);
2312 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2313 err = journal_wipe(journal, !really_read_only);
2315 err = journal_load(journal);
2318 ext3_msg(sb, KERN_ERR, "error loading journal");
2319 journal_destroy(journal);
2323 EXT3_SB(sb)->s_journal = journal;
2324 ext3_clear_journal_err(sb, es);
2326 if (!really_read_only && journal_devnum &&
2327 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2328 es->s_journal_dev = cpu_to_le32(journal_devnum);
2330 /* Make sure we flush the recovery flag to disk. */
2331 ext3_commit_super(sb, es, 1);
2337 static int ext3_create_journal(struct super_block *sb,
2338 struct ext3_super_block *es,
2339 unsigned int journal_inum)
2344 if (sb->s_flags & MS_RDONLY) {
2345 ext3_msg(sb, KERN_ERR,
2346 "error: readonly filesystem when trying to "
2351 journal = ext3_get_journal(sb, journal_inum);
2355 ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
2358 err = journal_create(journal);
2360 ext3_msg(sb, KERN_ERR, "error creating journal");
2361 journal_destroy(journal);
2365 EXT3_SB(sb)->s_journal = journal;
2367 ext3_update_dynamic_rev(sb);
2368 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2369 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2371 es->s_journal_inum = cpu_to_le32(journal_inum);
2373 /* Make sure we flush the recovery flag to disk. */
2374 ext3_commit_super(sb, es, 1);
2379 static int ext3_commit_super(struct super_block *sb,
2380 struct ext3_super_block *es,
2383 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2389 if (buffer_write_io_error(sbh)) {
2391 * Oh, dear. A previous attempt to write the
2392 * superblock failed. This could happen because the
2393 * USB device was yanked out. Or it could happen to
2394 * be a transient write error and maybe the block will
2395 * be remapped. Nothing we can do but to retry the
2396 * write and hope for the best.
2398 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2399 "superblock detected");
2400 clear_buffer_write_io_error(sbh);
2401 set_buffer_uptodate(sbh);
2404 * If the file system is mounted read-only, don't update the
2405 * superblock write time. This avoids updating the superblock
2406 * write time when we are mounting the root file system
2407 * read/only but we need to replay the journal; at that point,
2408 * for people who are east of GMT and who make their clock
2409 * tick in localtime for Windows bug-for-bug compatibility,
2410 * the clock is set in the future, and this will cause e2fsck
2411 * to complain and force a full file system check.
2413 if (!(sb->s_flags & MS_RDONLY))
2414 es->s_wtime = cpu_to_le32(get_seconds());
2415 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2416 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2417 BUFFER_TRACE(sbh, "marking dirty");
2418 mark_buffer_dirty(sbh);
2420 error = sync_dirty_buffer(sbh);
2421 if (buffer_write_io_error(sbh)) {
2422 ext3_msg(sb, KERN_ERR, "I/O error while writing "
2424 clear_buffer_write_io_error(sbh);
2425 set_buffer_uptodate(sbh);
2433 * Have we just finished recovery? If so, and if we are mounting (or
2434 * remounting) the filesystem readonly, then we will end up with a
2435 * consistent fs on disk. Record that fact.
2437 static void ext3_mark_recovery_complete(struct super_block * sb,
2438 struct ext3_super_block * es)
2440 journal_t *journal = EXT3_SB(sb)->s_journal;
2442 journal_lock_updates(journal);
2443 if (journal_flush(journal) < 0)
2446 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2447 sb->s_flags & MS_RDONLY) {
2448 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2449 ext3_commit_super(sb, es, 1);
2453 journal_unlock_updates(journal);
2457 * If we are mounting (or read-write remounting) a filesystem whose journal
2458 * has recorded an error from a previous lifetime, move that error to the
2459 * main filesystem now.
2461 static void ext3_clear_journal_err(struct super_block *sb,
2462 struct ext3_super_block *es)
2468 journal = EXT3_SB(sb)->s_journal;
2471 * Now check for any error status which may have been recorded in the
2472 * journal by a prior ext3_error() or ext3_abort()
2475 j_errno = journal_errno(journal);
2479 errstr = ext3_decode_error(sb, j_errno, nbuf);
2480 ext3_warning(sb, __func__, "Filesystem error recorded "
2481 "from previous mount: %s", errstr);
2482 ext3_warning(sb, __func__, "Marking fs in need of "
2483 "filesystem check.");
2485 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2486 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2487 ext3_commit_super (sb, es, 1);
2489 journal_clear_err(journal);
2494 * Force the running and committing transactions to commit,
2495 * and wait on the commit.
2497 int ext3_force_commit(struct super_block *sb)
2502 if (sb->s_flags & MS_RDONLY)
2505 journal = EXT3_SB(sb)->s_journal;
2506 ret = ext3_journal_force_commit(journal);
2510 static int ext3_sync_fs(struct super_block *sb, int wait)
2514 trace_ext3_sync_fs(sb, wait);
2516 * Writeback quota in non-journalled quota case - journalled quota has
2519 dquot_writeback_dquots(sb, -1);
2520 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2522 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2528 * LVM calls this function before a (read-only) snapshot is created. This
2529 * gives us a chance to flush the journal completely and mark the fs clean.
2531 static int ext3_freeze(struct super_block *sb)
2536 if (!(sb->s_flags & MS_RDONLY)) {
2537 journal = EXT3_SB(sb)->s_journal;
2539 /* Now we set up the journal barrier. */
2540 journal_lock_updates(journal);
2543 * We don't want to clear needs_recovery flag when we failed
2544 * to flush the journal.
2546 error = journal_flush(journal);
2550 /* Journal blocked and flushed, clear needs_recovery flag. */
2551 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2552 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2559 journal_unlock_updates(journal);
2564 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2565 * flag here, even though the filesystem is not technically dirty yet.
2567 static int ext3_unfreeze(struct super_block *sb)
2569 if (!(sb->s_flags & MS_RDONLY)) {
2570 /* Reser the needs_recovery flag before the fs is unlocked. */
2571 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2572 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2573 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2578 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2580 struct ext3_super_block * es;
2581 struct ext3_sb_info *sbi = EXT3_SB(sb);
2582 ext3_fsblk_t n_blocks_count = 0;
2583 unsigned long old_sb_flags;
2584 struct ext3_mount_options old_opts;
2585 int enable_quota = 0;
2591 sync_filesystem(sb);
2593 /* Store the original options */
2594 old_sb_flags = sb->s_flags;
2595 old_opts.s_mount_opt = sbi->s_mount_opt;
2596 old_opts.s_resuid = sbi->s_resuid;
2597 old_opts.s_resgid = sbi->s_resgid;
2598 old_opts.s_commit_interval = sbi->s_commit_interval;
2600 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2601 for (i = 0; i < MAXQUOTAS; i++)
2602 if (sbi->s_qf_names[i]) {
2603 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
2605 if (!old_opts.s_qf_names[i]) {
2608 for (j = 0; j < i; j++)
2609 kfree(old_opts.s_qf_names[j]);
2613 old_opts.s_qf_names[i] = NULL;
2617 * Allow the "check" option to be passed as a remount option.
2619 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2624 if (test_opt(sb, ABORT))
2625 ext3_abort(sb, __func__, "Abort forced by user");
2627 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2628 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2632 ext3_init_journal_params(sb, sbi->s_journal);
2634 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2635 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2636 if (test_opt(sb, ABORT)) {
2641 if (*flags & MS_RDONLY) {
2642 err = dquot_suspend(sb, -1);
2647 * First of all, the unconditional stuff we have to do
2648 * to disable replay of the journal when we next remount
2650 sb->s_flags |= MS_RDONLY;
2653 * OK, test if we are remounting a valid rw partition
2654 * readonly, and if so set the rdonly flag and then
2655 * mark the partition as valid again.
2657 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2658 (sbi->s_mount_state & EXT3_VALID_FS))
2659 es->s_state = cpu_to_le16(sbi->s_mount_state);
2661 ext3_mark_recovery_complete(sb, es);
2664 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2665 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2666 ext3_msg(sb, KERN_WARNING,
2667 "warning: couldn't remount RDWR "
2668 "because of unsupported optional "
2669 "features (%x)", le32_to_cpu(ret));
2675 * If we have an unprocessed orphan list hanging
2676 * around from a previously readonly bdev mount,
2677 * require a full umount & mount for now.
2679 if (es->s_last_orphan) {
2680 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
2681 "remount RDWR because of unprocessed "
2682 "orphan inode list. Please "
2683 "umount & mount instead.");
2689 * Mounting a RDONLY partition read-write, so reread
2690 * and store the current valid flag. (It may have
2691 * been changed by e2fsck since we originally mounted
2694 ext3_clear_journal_err(sb, es);
2695 sbi->s_mount_state = le16_to_cpu(es->s_state);
2696 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2698 if (!ext3_setup_super (sb, es, 0))
2699 sb->s_flags &= ~MS_RDONLY;
2704 /* Release old quota file names */
2705 for (i = 0; i < MAXQUOTAS; i++)
2706 kfree(old_opts.s_qf_names[i]);
2709 dquot_resume(sb, -1);
2712 sb->s_flags = old_sb_flags;
2713 sbi->s_mount_opt = old_opts.s_mount_opt;
2714 sbi->s_resuid = old_opts.s_resuid;
2715 sbi->s_resgid = old_opts.s_resgid;
2716 sbi->s_commit_interval = old_opts.s_commit_interval;
2718 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2719 for (i = 0; i < MAXQUOTAS; i++) {
2720 kfree(sbi->s_qf_names[i]);
2721 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2727 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2729 struct super_block *sb = dentry->d_sb;
2730 struct ext3_sb_info *sbi = EXT3_SB(sb);
2731 struct ext3_super_block *es = sbi->s_es;
2734 if (test_opt(sb, MINIX_DF)) {
2735 sbi->s_overhead_last = 0;
2736 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2737 unsigned long ngroups = sbi->s_groups_count, i;
2738 ext3_fsblk_t overhead = 0;
2742 * Compute the overhead (FS structures). This is constant
2743 * for a given filesystem unless the number of block groups
2744 * changes so we cache the previous value until it does.
2748 * All of the blocks before first_data_block are
2751 overhead = le32_to_cpu(es->s_first_data_block);
2754 * Add the overhead attributed to the superblock and
2755 * block group descriptors. If the sparse superblocks
2756 * feature is turned on, then not all groups have this.
2758 for (i = 0; i < ngroups; i++) {
2759 overhead += ext3_bg_has_super(sb, i) +
2760 ext3_bg_num_gdb(sb, i);
2765 * Every block group has an inode bitmap, a block
2766 * bitmap, and an inode table.
2768 overhead += ngroups * (2 + sbi->s_itb_per_group);
2769 sbi->s_overhead_last = overhead;
2771 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2774 buf->f_type = EXT3_SUPER_MAGIC;
2775 buf->f_bsize = sb->s_blocksize;
2776 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2777 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2778 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2779 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2781 buf->f_files = le32_to_cpu(es->s_inodes_count);
2782 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2783 buf->f_namelen = EXT3_NAME_LEN;
2784 fsid = le64_to_cpup((void *)es->s_uuid) ^
2785 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2786 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2787 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2791 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2792 * is locked for write. Otherwise the are possible deadlocks:
2793 * Process 1 Process 2
2794 * ext3_create() quota_sync()
2795 * journal_start() write_dquot()
2796 * dquot_initialize() down(dqio_mutex)
2797 * down(dqio_mutex) journal_start()
2803 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2805 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
2808 static int ext3_write_dquot(struct dquot *dquot)
2812 struct inode *inode;
2814 inode = dquot_to_inode(dquot);
2815 handle = ext3_journal_start(inode,
2816 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2818 return PTR_ERR(handle);
2819 ret = dquot_commit(dquot);
2820 err = ext3_journal_stop(handle);
2826 static int ext3_acquire_dquot(struct dquot *dquot)
2831 handle = ext3_journal_start(dquot_to_inode(dquot),
2832 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2834 return PTR_ERR(handle);
2835 ret = dquot_acquire(dquot);
2836 err = ext3_journal_stop(handle);
2842 static int ext3_release_dquot(struct dquot *dquot)
2847 handle = ext3_journal_start(dquot_to_inode(dquot),
2848 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2849 if (IS_ERR(handle)) {
2850 /* Release dquot anyway to avoid endless cycle in dqput() */
2851 dquot_release(dquot);
2852 return PTR_ERR(handle);
2854 ret = dquot_release(dquot);
2855 err = ext3_journal_stop(handle);
2861 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2863 /* Are we journaling quotas? */
2864 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2865 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2866 dquot_mark_dquot_dirty(dquot);
2867 return ext3_write_dquot(dquot);
2869 return dquot_mark_dquot_dirty(dquot);
2873 static int ext3_write_info(struct super_block *sb, int type)
2878 /* Data block + inode block */
2879 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2881 return PTR_ERR(handle);
2882 ret = dquot_commit_info(sb, type);
2883 err = ext3_journal_stop(handle);
2890 * Turn on quotas during mount time - we need to find
2891 * the quota file and such...
2893 static int ext3_quota_on_mount(struct super_block *sb, int type)
2895 return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2896 EXT3_SB(sb)->s_jquota_fmt, type);
2900 * Standard function to be called on quota_on
2902 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2907 if (!test_opt(sb, QUOTA))
2910 /* Quotafile not on the same filesystem? */
2911 if (path->dentry->d_sb != sb)
2913 /* Journaling quota? */
2914 if (EXT3_SB(sb)->s_qf_names[type]) {
2915 /* Quotafile not of fs root? */
2916 if (path->dentry->d_parent != sb->s_root)
2917 ext3_msg(sb, KERN_WARNING,
2918 "warning: Quota file not on filesystem root. "
2919 "Journaled quota will not work.");
2923 * When we journal data on quota file, we have to flush journal to see
2924 * all updates to the file when we bypass pagecache...
2926 if (ext3_should_journal_data(path->dentry->d_inode)) {
2928 * We don't need to lock updates but journal_flush() could
2929 * otherwise be livelocked...
2931 journal_lock_updates(EXT3_SB(sb)->s_journal);
2932 err = journal_flush(EXT3_SB(sb)->s_journal);
2933 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2938 return dquot_quota_on(sb, type, format_id, path);
2941 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2942 * acquiring the locks... As quota files are never truncated and quota code
2943 * itself serializes the operations (and no one else should touch the files)
2944 * we don't have to be afraid of races */
2945 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2946 size_t len, loff_t off)
2948 struct inode *inode = sb_dqopt(sb)->files[type];
2949 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2951 int offset = off & (sb->s_blocksize - 1);
2954 struct buffer_head *bh;
2955 loff_t i_size = i_size_read(inode);
2959 if (off+len > i_size)
2962 while (toread > 0) {
2963 tocopy = sb->s_blocksize - offset < toread ?
2964 sb->s_blocksize - offset : toread;
2965 bh = ext3_bread(NULL, inode, blk, 0, &err);
2968 if (!bh) /* A hole? */
2969 memset(data, 0, tocopy);
2971 memcpy(data, bh->b_data+offset, tocopy);
2981 /* Write to quotafile (we know the transaction is already started and has
2982 * enough credits) */
2983 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2984 const char *data, size_t len, loff_t off)
2986 struct inode *inode = sb_dqopt(sb)->files[type];
2987 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2989 int offset = off & (sb->s_blocksize - 1);
2990 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2991 struct buffer_head *bh;
2992 handle_t *handle = journal_current_handle();
2995 ext3_msg(sb, KERN_WARNING,
2996 "warning: quota write (off=%llu, len=%llu)"
2997 " cancelled because transaction is not started.",
2998 (unsigned long long)off, (unsigned long long)len);
3003 * Since we account only one data block in transaction credits,
3004 * then it is impossible to cross a block boundary.
3006 if (sb->s_blocksize - offset < len) {
3007 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3008 " cancelled because not block aligned",
3009 (unsigned long long)off, (unsigned long long)len);
3012 bh = ext3_bread(handle, inode, blk, 1, &err);
3015 if (journal_quota) {
3016 err = ext3_journal_get_write_access(handle, bh);
3023 memcpy(bh->b_data+offset, data, len);
3024 flush_dcache_page(bh->b_page);
3027 err = ext3_journal_dirty_metadata(handle, bh);
3029 /* Always do at least ordered writes for quotas */
3030 err = ext3_journal_dirty_data(handle, bh);
3031 mark_buffer_dirty(bh);
3037 if (inode->i_size < off + len) {
3038 i_size_write(inode, off + len);
3039 EXT3_I(inode)->i_disksize = inode->i_size;
3042 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3043 ext3_mark_inode_dirty(handle, inode);
3049 static struct dentry *ext3_mount(struct file_system_type *fs_type,
3050 int flags, const char *dev_name, void *data)
3052 return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
3055 static struct file_system_type ext3_fs_type = {
3056 .owner = THIS_MODULE,
3058 .mount = ext3_mount,
3059 .kill_sb = kill_block_super,
3060 .fs_flags = FS_REQUIRES_DEV,
3062 MODULE_ALIAS_FS("ext3");
3064 static int __init init_ext3_fs(void)
3066 int err = init_ext3_xattr();
3069 err = init_inodecache();
3072 err = register_filesystem(&ext3_fs_type);
3077 destroy_inodecache();
3083 static void __exit exit_ext3_fs(void)
3085 unregister_filesystem(&ext3_fs_type);
3086 destroy_inodecache();
3090 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3091 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3092 MODULE_LICENSE("GPL");
3093 module_init(init_ext3_fs)
3094 module_exit(exit_ext3_fs)