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/smp_lock.h>
31 #include <linux/buffer_head.h>
32 #include <linux/exportfs.h>
33 #include <linux/vfs.h>
34 #include <linux/random.h>
35 #include <linux/mount.h>
36 #include <linux/namei.h>
37 #include <linux/quotaops.h>
38 #include <linux/seq_file.h>
39 #include <linux/log2.h>
41 #include <asm/uaccess.h>
47 #ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
48 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
50 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
53 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
54 unsigned long journal_devnum);
55 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
57 static int ext3_commit_super(struct super_block *sb,
58 struct ext3_super_block *es,
60 static void ext3_mark_recovery_complete(struct super_block * sb,
61 struct ext3_super_block * es);
62 static void ext3_clear_journal_err(struct super_block * sb,
63 struct ext3_super_block * es);
64 static int ext3_sync_fs(struct super_block *sb, int wait);
65 static const char *ext3_decode_error(struct super_block * sb, int errno,
67 static int ext3_remount (struct super_block * sb, int * flags, char * data);
68 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
69 static int ext3_unfreeze(struct super_block *sb);
70 static int ext3_freeze(struct super_block *sb);
73 * Wrappers for journal_start/end.
75 * The only special thing we need to do here is to make sure that all
76 * journal_end calls result in the superblock being marked dirty, so
77 * that sync() will call the filesystem's write_super callback if
80 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
84 if (sb->s_flags & MS_RDONLY)
85 return ERR_PTR(-EROFS);
87 /* Special case here: if the journal has aborted behind our
88 * backs (eg. EIO in the commit thread), then we still need to
89 * take the FS itself readonly cleanly. */
90 journal = EXT3_SB(sb)->s_journal;
91 if (is_journal_aborted(journal)) {
92 ext3_abort(sb, __func__,
93 "Detected aborted journal");
94 return ERR_PTR(-EROFS);
97 return journal_start(journal, nblocks);
101 * The only special thing we need to do here is to make sure that all
102 * journal_stop calls result in the superblock being marked dirty, so
103 * that sync() will call the filesystem's write_super callback if
106 int __ext3_journal_stop(const char *where, handle_t *handle)
108 struct super_block *sb;
112 sb = handle->h_transaction->t_journal->j_private;
114 rc = journal_stop(handle);
119 __ext3_std_error(sb, where, err);
123 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
124 struct buffer_head *bh, handle_t *handle, int err)
127 const char *errstr = ext3_decode_error(NULL, err, nbuf);
130 BUFFER_TRACE(bh, "abort");
135 if (is_handle_aborted(handle))
138 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
139 caller, errstr, err_fn);
141 journal_abort_handle(handle);
144 /* Deal with the reporting of failure conditions on a filesystem such as
145 * inconsistencies detected or read IO failures.
147 * On ext2, we can store the error state of the filesystem in the
148 * superblock. That is not possible on ext3, because we may have other
149 * write ordering constraints on the superblock which prevent us from
150 * writing it out straight away; and given that the journal is about to
151 * be aborted, we can't rely on the current, or future, transactions to
152 * write out the superblock safely.
154 * We'll just use the journal_abort() error code to record an error in
155 * the journal instead. On recovery, the journal will compain about
156 * that error until we've noted it down and cleared it.
159 static void ext3_handle_error(struct super_block *sb)
161 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
163 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
164 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
166 if (sb->s_flags & MS_RDONLY)
169 if (!test_opt (sb, ERRORS_CONT)) {
170 journal_t *journal = EXT3_SB(sb)->s_journal;
172 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
174 journal_abort(journal, -EIO);
176 if (test_opt (sb, ERRORS_RO)) {
177 printk (KERN_CRIT "Remounting filesystem read-only\n");
178 sb->s_flags |= MS_RDONLY;
180 ext3_commit_super(sb, es, 1);
181 if (test_opt(sb, ERRORS_PANIC))
182 panic("EXT3-fs (device %s): panic forced after error\n",
186 void ext3_error (struct super_block * sb, const char * function,
187 const char * fmt, ...)
192 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
197 ext3_handle_error(sb);
200 static const char *ext3_decode_error(struct super_block * sb, int errno,
207 errstr = "IO failure";
210 errstr = "Out of memory";
213 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
214 errstr = "Journal has aborted";
216 errstr = "Readonly filesystem";
219 /* If the caller passed in an extra buffer for unknown
220 * errors, textualise them now. Else we just return
223 /* Check for truncated error codes... */
224 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
233 /* __ext3_std_error decodes expected errors from journaling functions
234 * automatically and invokes the appropriate error response. */
236 void __ext3_std_error (struct super_block * sb, const char * function,
242 /* Special case: if the error is EROFS, and we're not already
243 * inside a transaction, then there's really no point in logging
245 if (errno == -EROFS && journal_current_handle() == NULL &&
246 (sb->s_flags & MS_RDONLY))
249 errstr = ext3_decode_error(sb, errno, nbuf);
250 printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
251 sb->s_id, function, errstr);
253 ext3_handle_error(sb);
257 * ext3_abort is a much stronger failure handler than ext3_error. The
258 * abort function may be used to deal with unrecoverable failures such
259 * as journal IO errors or ENOMEM at a critical moment in log management.
261 * We unconditionally force the filesystem into an ABORT|READONLY state,
262 * unless the error response on the fs has been set to panic in which
263 * case we take the easy way out and panic immediately.
266 void ext3_abort (struct super_block * sb, const char * function,
267 const char * fmt, ...)
271 printk (KERN_CRIT "ext3_abort called.\n");
274 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
279 if (test_opt(sb, ERRORS_PANIC))
280 panic("EXT3-fs panic from previous error\n");
282 if (sb->s_flags & MS_RDONLY)
285 printk(KERN_CRIT "Remounting filesystem read-only\n");
286 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
287 sb->s_flags |= MS_RDONLY;
288 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
289 if (EXT3_SB(sb)->s_journal)
290 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
293 void ext3_warning (struct super_block * sb, const char * function,
294 const char * fmt, ...)
299 printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
306 void ext3_update_dynamic_rev(struct super_block *sb)
308 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
310 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
313 ext3_warning(sb, __func__,
314 "updating to rev %d because of new feature flag, "
315 "running e2fsck is recommended",
318 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
319 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
320 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
321 /* leave es->s_feature_*compat flags alone */
322 /* es->s_uuid will be set by e2fsck if empty */
325 * The rest of the superblock fields should be zero, and if not it
326 * means they are likely already in use, so leave them alone. We
327 * can leave it up to e2fsck to clean up any inconsistencies there.
332 * Open the external journal device
334 static struct block_device *ext3_blkdev_get(dev_t dev)
336 struct block_device *bdev;
337 char b[BDEVNAME_SIZE];
339 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
345 printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
346 __bdevname(dev, b), PTR_ERR(bdev));
351 * Release the journal device
353 static int ext3_blkdev_put(struct block_device *bdev)
356 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
359 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
361 struct block_device *bdev;
364 bdev = sbi->journal_bdev;
366 ret = ext3_blkdev_put(bdev);
367 sbi->journal_bdev = NULL;
372 static inline struct inode *orphan_list_entry(struct list_head *l)
374 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
377 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
381 printk(KERN_ERR "sb orphan head is %d\n",
382 le32_to_cpu(sbi->s_es->s_last_orphan));
384 printk(KERN_ERR "sb_info orphan list:\n");
385 list_for_each(l, &sbi->s_orphan) {
386 struct inode *inode = orphan_list_entry(l);
388 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
389 inode->i_sb->s_id, inode->i_ino, inode,
390 inode->i_mode, inode->i_nlink,
395 static void ext3_put_super (struct super_block * sb)
397 struct ext3_sb_info *sbi = EXT3_SB(sb);
398 struct ext3_super_block *es = sbi->s_es;
403 ext3_xattr_put_super(sb);
404 err = journal_destroy(sbi->s_journal);
405 sbi->s_journal = NULL;
407 ext3_abort(sb, __func__, "Couldn't clean up the journal");
409 if (!(sb->s_flags & MS_RDONLY)) {
410 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
411 es->s_state = cpu_to_le16(sbi->s_mount_state);
412 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
413 mark_buffer_dirty(sbi->s_sbh);
414 ext3_commit_super(sb, es, 1);
417 for (i = 0; i < sbi->s_gdb_count; i++)
418 brelse(sbi->s_group_desc[i]);
419 kfree(sbi->s_group_desc);
420 percpu_counter_destroy(&sbi->s_freeblocks_counter);
421 percpu_counter_destroy(&sbi->s_freeinodes_counter);
422 percpu_counter_destroy(&sbi->s_dirs_counter);
425 for (i = 0; i < MAXQUOTAS; i++)
426 kfree(sbi->s_qf_names[i]);
429 /* Debugging code just in case the in-memory inode orphan list
430 * isn't empty. The on-disk one can be non-empty if we've
431 * detected an error and taken the fs readonly, but the
432 * in-memory list had better be clean by this point. */
433 if (!list_empty(&sbi->s_orphan))
434 dump_orphan_list(sb, sbi);
435 J_ASSERT(list_empty(&sbi->s_orphan));
437 invalidate_bdev(sb->s_bdev);
438 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
440 * Invalidate the journal device's buffers. We don't want them
441 * floating about in memory - the physical journal device may
442 * hotswapped, and it breaks the `ro-after' testing code.
444 sync_blockdev(sbi->journal_bdev);
445 invalidate_bdev(sbi->journal_bdev);
446 ext3_blkdev_remove(sbi);
448 sb->s_fs_info = NULL;
449 kfree(sbi->s_blockgroup_lock);
455 static struct kmem_cache *ext3_inode_cachep;
458 * Called inside transaction, so use GFP_NOFS
460 static struct inode *ext3_alloc_inode(struct super_block *sb)
462 struct ext3_inode_info *ei;
464 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
467 ei->i_block_alloc_info = NULL;
468 ei->vfs_inode.i_version = 1;
469 atomic_set(&ei->i_datasync_tid, 0);
470 atomic_set(&ei->i_sync_tid, 0);
471 return &ei->vfs_inode;
474 static void ext3_destroy_inode(struct inode *inode)
476 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
477 printk("EXT3 Inode %p: orphan list check failed!\n",
479 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
480 EXT3_I(inode), sizeof(struct ext3_inode_info),
484 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
487 static void init_once(void *foo)
489 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
491 INIT_LIST_HEAD(&ei->i_orphan);
492 #ifdef CONFIG_EXT3_FS_XATTR
493 init_rwsem(&ei->xattr_sem);
495 mutex_init(&ei->truncate_mutex);
496 inode_init_once(&ei->vfs_inode);
499 static int init_inodecache(void)
501 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
502 sizeof(struct ext3_inode_info),
503 0, (SLAB_RECLAIM_ACCOUNT|
506 if (ext3_inode_cachep == NULL)
511 static void destroy_inodecache(void)
513 kmem_cache_destroy(ext3_inode_cachep);
516 static void ext3_clear_inode(struct inode *inode)
518 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
519 ext3_discard_reservation(inode);
520 EXT3_I(inode)->i_block_alloc_info = NULL;
525 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
527 #if defined(CONFIG_QUOTA)
528 struct ext3_sb_info *sbi = EXT3_SB(sb);
530 if (sbi->s_jquota_fmt)
531 seq_printf(seq, ",jqfmt=%s",
532 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
534 if (sbi->s_qf_names[USRQUOTA])
535 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
537 if (sbi->s_qf_names[GRPQUOTA])
538 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
540 if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
541 seq_puts(seq, ",usrquota");
543 if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
544 seq_puts(seq, ",grpquota");
548 static char *data_mode_string(unsigned long mode)
551 case EXT3_MOUNT_JOURNAL_DATA:
553 case EXT3_MOUNT_ORDERED_DATA:
555 case EXT3_MOUNT_WRITEBACK_DATA:
563 * - it's set to a non-default value OR
564 * - if the per-sb default is different from the global default
566 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
568 struct super_block *sb = vfs->mnt_sb;
569 struct ext3_sb_info *sbi = EXT3_SB(sb);
570 struct ext3_super_block *es = sbi->s_es;
571 unsigned long def_mount_opts;
573 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
575 if (sbi->s_sb_block != 1)
576 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
577 if (test_opt(sb, MINIX_DF))
578 seq_puts(seq, ",minixdf");
579 if (test_opt(sb, GRPID))
580 seq_puts(seq, ",grpid");
581 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
582 seq_puts(seq, ",nogrpid");
583 if (sbi->s_resuid != EXT3_DEF_RESUID ||
584 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
585 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
587 if (sbi->s_resgid != EXT3_DEF_RESGID ||
588 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
589 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
591 if (test_opt(sb, ERRORS_RO)) {
592 int def_errors = le16_to_cpu(es->s_errors);
594 if (def_errors == EXT3_ERRORS_PANIC ||
595 def_errors == EXT3_ERRORS_CONTINUE) {
596 seq_puts(seq, ",errors=remount-ro");
599 if (test_opt(sb, ERRORS_CONT))
600 seq_puts(seq, ",errors=continue");
601 if (test_opt(sb, ERRORS_PANIC))
602 seq_puts(seq, ",errors=panic");
603 if (test_opt(sb, NO_UID32))
604 seq_puts(seq, ",nouid32");
605 if (test_opt(sb, DEBUG))
606 seq_puts(seq, ",debug");
607 if (test_opt(sb, OLDALLOC))
608 seq_puts(seq, ",oldalloc");
609 #ifdef CONFIG_EXT3_FS_XATTR
610 if (test_opt(sb, XATTR_USER))
611 seq_puts(seq, ",user_xattr");
612 if (!test_opt(sb, XATTR_USER) &&
613 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
614 seq_puts(seq, ",nouser_xattr");
617 #ifdef CONFIG_EXT3_FS_POSIX_ACL
618 if (test_opt(sb, POSIX_ACL))
619 seq_puts(seq, ",acl");
620 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
621 seq_puts(seq, ",noacl");
623 if (!test_opt(sb, RESERVATION))
624 seq_puts(seq, ",noreservation");
625 if (sbi->s_commit_interval) {
626 seq_printf(seq, ",commit=%u",
627 (unsigned) (sbi->s_commit_interval / HZ));
629 if (test_opt(sb, BARRIER))
630 seq_puts(seq, ",barrier=1");
631 if (test_opt(sb, NOBH))
632 seq_puts(seq, ",nobh");
634 seq_printf(seq, ",data=%s", data_mode_string(sbi->s_mount_opt &
635 EXT3_MOUNT_DATA_FLAGS));
636 if (test_opt(sb, DATA_ERR_ABORT))
637 seq_puts(seq, ",data_err=abort");
639 if (test_opt(sb, NOLOAD))
640 seq_puts(seq, ",norecovery");
642 ext3_show_quota_options(seq, sb);
648 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
649 u64 ino, u32 generation)
653 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
654 return ERR_PTR(-ESTALE);
655 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
656 return ERR_PTR(-ESTALE);
658 /* iget isn't really right if the inode is currently unallocated!!
660 * ext3_read_inode will return a bad_inode if the inode had been
661 * deleted, so we should be safe.
663 * Currently we don't know the generation for parent directory, so
664 * a generation of 0 means "accept any"
666 inode = ext3_iget(sb, ino);
668 return ERR_CAST(inode);
669 if (generation && inode->i_generation != generation) {
671 return ERR_PTR(-ESTALE);
677 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
678 int fh_len, int fh_type)
680 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
684 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
685 int fh_len, int fh_type)
687 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
692 * Try to release metadata pages (indirect blocks, directories) which are
693 * mapped via the block device. Since these pages could have journal heads
694 * which would prevent try_to_free_buffers() from freeing them, we must use
695 * jbd layer's try_to_free_buffers() function to release them.
697 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
700 journal_t *journal = EXT3_SB(sb)->s_journal;
702 WARN_ON(PageChecked(page));
703 if (!page_has_buffers(page))
706 return journal_try_to_free_buffers(journal, page,
708 return try_to_free_buffers(page);
712 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
713 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
715 static int ext3_write_dquot(struct dquot *dquot);
716 static int ext3_acquire_dquot(struct dquot *dquot);
717 static int ext3_release_dquot(struct dquot *dquot);
718 static int ext3_mark_dquot_dirty(struct dquot *dquot);
719 static int ext3_write_info(struct super_block *sb, int type);
720 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
721 char *path, int remount);
722 static int ext3_quota_on_mount(struct super_block *sb, int type);
723 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
724 size_t len, loff_t off);
725 static ssize_t ext3_quota_write(struct super_block *sb, int type,
726 const char *data, size_t len, loff_t off);
728 static const struct dquot_operations ext3_quota_operations = {
729 .initialize = dquot_initialize,
731 .alloc_space = dquot_alloc_space,
732 .alloc_inode = dquot_alloc_inode,
733 .free_space = dquot_free_space,
734 .free_inode = dquot_free_inode,
735 .transfer = dquot_transfer,
736 .write_dquot = ext3_write_dquot,
737 .acquire_dquot = ext3_acquire_dquot,
738 .release_dquot = ext3_release_dquot,
739 .mark_dirty = ext3_mark_dquot_dirty,
740 .write_info = ext3_write_info,
741 .alloc_dquot = dquot_alloc,
742 .destroy_dquot = dquot_destroy,
745 static const struct quotactl_ops ext3_qctl_operations = {
746 .quota_on = ext3_quota_on,
747 .quota_off = vfs_quota_off,
748 .quota_sync = vfs_quota_sync,
749 .get_info = vfs_get_dqinfo,
750 .set_info = vfs_set_dqinfo,
751 .get_dqblk = vfs_get_dqblk,
752 .set_dqblk = vfs_set_dqblk
756 static const struct super_operations ext3_sops = {
757 .alloc_inode = ext3_alloc_inode,
758 .destroy_inode = ext3_destroy_inode,
759 .write_inode = ext3_write_inode,
760 .dirty_inode = ext3_dirty_inode,
761 .delete_inode = ext3_delete_inode,
762 .put_super = ext3_put_super,
763 .sync_fs = ext3_sync_fs,
764 .freeze_fs = ext3_freeze,
765 .unfreeze_fs = ext3_unfreeze,
766 .statfs = ext3_statfs,
767 .remount_fs = ext3_remount,
768 .clear_inode = ext3_clear_inode,
769 .show_options = ext3_show_options,
771 .quota_read = ext3_quota_read,
772 .quota_write = ext3_quota_write,
774 .bdev_try_to_free_page = bdev_try_to_free_page,
777 static const struct export_operations ext3_export_ops = {
778 .fh_to_dentry = ext3_fh_to_dentry,
779 .fh_to_parent = ext3_fh_to_parent,
780 .get_parent = ext3_get_parent,
784 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
785 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
786 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
787 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
788 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
789 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
790 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
791 Opt_data_err_abort, Opt_data_err_ignore,
792 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
793 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
794 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
798 static const match_table_t tokens = {
799 {Opt_bsd_df, "bsddf"},
800 {Opt_minix_df, "minixdf"},
801 {Opt_grpid, "grpid"},
802 {Opt_grpid, "bsdgroups"},
803 {Opt_nogrpid, "nogrpid"},
804 {Opt_nogrpid, "sysvgroups"},
805 {Opt_resgid, "resgid=%u"},
806 {Opt_resuid, "resuid=%u"},
808 {Opt_err_cont, "errors=continue"},
809 {Opt_err_panic, "errors=panic"},
810 {Opt_err_ro, "errors=remount-ro"},
811 {Opt_nouid32, "nouid32"},
812 {Opt_nocheck, "nocheck"},
813 {Opt_nocheck, "check=none"},
814 {Opt_debug, "debug"},
815 {Opt_oldalloc, "oldalloc"},
816 {Opt_orlov, "orlov"},
817 {Opt_user_xattr, "user_xattr"},
818 {Opt_nouser_xattr, "nouser_xattr"},
820 {Opt_noacl, "noacl"},
821 {Opt_reservation, "reservation"},
822 {Opt_noreservation, "noreservation"},
823 {Opt_noload, "noload"},
824 {Opt_noload, "norecovery"},
827 {Opt_commit, "commit=%u"},
828 {Opt_journal_update, "journal=update"},
829 {Opt_journal_inum, "journal=%u"},
830 {Opt_journal_dev, "journal_dev=%u"},
831 {Opt_abort, "abort"},
832 {Opt_data_journal, "data=journal"},
833 {Opt_data_ordered, "data=ordered"},
834 {Opt_data_writeback, "data=writeback"},
835 {Opt_data_err_abort, "data_err=abort"},
836 {Opt_data_err_ignore, "data_err=ignore"},
837 {Opt_offusrjquota, "usrjquota="},
838 {Opt_usrjquota, "usrjquota=%s"},
839 {Opt_offgrpjquota, "grpjquota="},
840 {Opt_grpjquota, "grpjquota=%s"},
841 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
842 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
843 {Opt_grpquota, "grpquota"},
844 {Opt_noquota, "noquota"},
845 {Opt_quota, "quota"},
846 {Opt_usrquota, "usrquota"},
847 {Opt_barrier, "barrier=%u"},
848 {Opt_resize, "resize"},
852 static ext3_fsblk_t get_sb_block(void **data)
854 ext3_fsblk_t sb_block;
855 char *options = (char *) *data;
857 if (!options || strncmp(options, "sb=", 3) != 0)
858 return 1; /* Default location */
860 /*todo: use simple_strtoll with >32bit ext3 */
861 sb_block = simple_strtoul(options, &options, 0);
862 if (*options && *options != ',') {
863 printk("EXT3-fs: Invalid sb specification: %s\n",
869 *data = (void *) options;
873 static int parse_options (char *options, struct super_block *sb,
874 unsigned int *inum, unsigned long *journal_devnum,
875 ext3_fsblk_t *n_blocks_count, int is_remount)
877 struct ext3_sb_info *sbi = EXT3_SB(sb);
879 substring_t args[MAX_OPT_ARGS];
890 while ((p = strsep (&options, ",")) != NULL) {
895 token = match_token(p, tokens, args);
898 clear_opt (sbi->s_mount_opt, MINIX_DF);
901 set_opt (sbi->s_mount_opt, MINIX_DF);
904 set_opt (sbi->s_mount_opt, GRPID);
907 clear_opt (sbi->s_mount_opt, GRPID);
910 if (match_int(&args[0], &option))
912 sbi->s_resuid = option;
915 if (match_int(&args[0], &option))
917 sbi->s_resgid = option;
920 /* handled by get_sb_block() instead of here */
921 /* *sb_block = match_int(&args[0]); */
924 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
925 clear_opt (sbi->s_mount_opt, ERRORS_RO);
926 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
929 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
930 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
931 set_opt (sbi->s_mount_opt, ERRORS_RO);
934 clear_opt (sbi->s_mount_opt, ERRORS_RO);
935 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
936 set_opt (sbi->s_mount_opt, ERRORS_CONT);
939 set_opt (sbi->s_mount_opt, NO_UID32);
942 clear_opt (sbi->s_mount_opt, CHECK);
945 set_opt (sbi->s_mount_opt, DEBUG);
948 set_opt (sbi->s_mount_opt, OLDALLOC);
951 clear_opt (sbi->s_mount_opt, OLDALLOC);
953 #ifdef CONFIG_EXT3_FS_XATTR
955 set_opt (sbi->s_mount_opt, XATTR_USER);
957 case Opt_nouser_xattr:
958 clear_opt (sbi->s_mount_opt, XATTR_USER);
962 case Opt_nouser_xattr:
963 printk("EXT3 (no)user_xattr options not supported\n");
966 #ifdef CONFIG_EXT3_FS_POSIX_ACL
968 set_opt(sbi->s_mount_opt, POSIX_ACL);
971 clear_opt(sbi->s_mount_opt, POSIX_ACL);
976 printk("EXT3 (no)acl options not supported\n");
979 case Opt_reservation:
980 set_opt(sbi->s_mount_opt, RESERVATION);
982 case Opt_noreservation:
983 clear_opt(sbi->s_mount_opt, RESERVATION);
985 case Opt_journal_update:
987 /* Eventually we will want to be able to create
988 a journal file here. For now, only allow the
989 user to specify an existing inode to be the
992 printk(KERN_ERR "EXT3-fs: cannot specify "
993 "journal on remount\n");
996 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
998 case Opt_journal_inum:
1000 printk(KERN_ERR "EXT3-fs: cannot specify "
1001 "journal on remount\n");
1004 if (match_int(&args[0], &option))
1008 case Opt_journal_dev:
1010 printk(KERN_ERR "EXT3-fs: cannot specify "
1011 "journal on remount\n");
1014 if (match_int(&args[0], &option))
1016 *journal_devnum = option;
1019 set_opt (sbi->s_mount_opt, NOLOAD);
1022 if (match_int(&args[0], &option))
1027 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1028 sbi->s_commit_interval = HZ * option;
1030 case Opt_data_journal:
1031 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1033 case Opt_data_ordered:
1034 data_opt = EXT3_MOUNT_ORDERED_DATA;
1036 case Opt_data_writeback:
1037 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1040 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
1044 "EXT3-fs (device %s): Cannot change "
1045 "data mode on remount. The filesystem "
1046 "is mounted in data=%s mode and you "
1047 "try to remount it in data=%s mode.\n",
1049 data_mode_string(sbi->s_mount_opt &
1050 EXT3_MOUNT_DATA_FLAGS),
1051 data_mode_string(data_opt));
1054 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
1055 sbi->s_mount_opt |= data_opt;
1058 case Opt_data_err_abort:
1059 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1061 case Opt_data_err_ignore:
1062 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1071 if (sb_any_quota_loaded(sb) &&
1072 !sbi->s_qf_names[qtype]) {
1074 "EXT3-fs: Cannot change journaled "
1075 "quota options when quota turned on.\n");
1078 qname = match_strdup(&args[0]);
1081 "EXT3-fs: not enough memory for "
1082 "storing quotafile name.\n");
1085 if (sbi->s_qf_names[qtype] &&
1086 strcmp(sbi->s_qf_names[qtype], qname)) {
1088 "EXT3-fs: %s quota file already "
1089 "specified.\n", QTYPE2NAME(qtype));
1093 sbi->s_qf_names[qtype] = qname;
1094 if (strchr(sbi->s_qf_names[qtype], '/')) {
1096 "EXT3-fs: quotafile must be on "
1097 "filesystem root.\n");
1098 kfree(sbi->s_qf_names[qtype]);
1099 sbi->s_qf_names[qtype] = NULL;
1102 set_opt(sbi->s_mount_opt, QUOTA);
1104 case Opt_offusrjquota:
1107 case Opt_offgrpjquota:
1110 if (sb_any_quota_loaded(sb) &&
1111 sbi->s_qf_names[qtype]) {
1112 printk(KERN_ERR "EXT3-fs: Cannot change "
1113 "journaled quota options when "
1114 "quota turned on.\n");
1118 * The space will be released later when all options
1119 * are confirmed to be correct
1121 sbi->s_qf_names[qtype] = NULL;
1123 case Opt_jqfmt_vfsold:
1124 qfmt = QFMT_VFS_OLD;
1126 case Opt_jqfmt_vfsv0:
1129 if (sb_any_quota_loaded(sb) &&
1130 sbi->s_jquota_fmt != qfmt) {
1131 printk(KERN_ERR "EXT3-fs: Cannot change "
1132 "journaled quota options when "
1133 "quota turned on.\n");
1136 sbi->s_jquota_fmt = qfmt;
1140 set_opt(sbi->s_mount_opt, QUOTA);
1141 set_opt(sbi->s_mount_opt, USRQUOTA);
1144 set_opt(sbi->s_mount_opt, QUOTA);
1145 set_opt(sbi->s_mount_opt, GRPQUOTA);
1148 if (sb_any_quota_loaded(sb)) {
1149 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1150 "options when quota turned on.\n");
1153 clear_opt(sbi->s_mount_opt, QUOTA);
1154 clear_opt(sbi->s_mount_opt, USRQUOTA);
1155 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1162 "EXT3-fs: quota options not supported.\n");
1166 case Opt_offusrjquota:
1167 case Opt_offgrpjquota:
1168 case Opt_jqfmt_vfsold:
1169 case Opt_jqfmt_vfsv0:
1171 "EXT3-fs: journaled quota options not "
1178 set_opt(sbi->s_mount_opt, ABORT);
1181 if (match_int(&args[0], &option))
1184 set_opt(sbi->s_mount_opt, BARRIER);
1186 clear_opt(sbi->s_mount_opt, BARRIER);
1192 printk("EXT3-fs: resize option only available "
1196 if (match_int(&args[0], &option) != 0)
1198 *n_blocks_count = option;
1201 set_opt(sbi->s_mount_opt, NOBH);
1204 clear_opt(sbi->s_mount_opt, NOBH);
1208 "EXT3-fs: Unrecognized mount option \"%s\" "
1209 "or missing value\n", p);
1214 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1215 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1216 sbi->s_qf_names[USRQUOTA])
1217 clear_opt(sbi->s_mount_opt, USRQUOTA);
1219 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1220 sbi->s_qf_names[GRPQUOTA])
1221 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1223 if ((sbi->s_qf_names[USRQUOTA] &&
1224 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1225 (sbi->s_qf_names[GRPQUOTA] &&
1226 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1227 printk(KERN_ERR "EXT3-fs: old and new quota "
1228 "format mixing.\n");
1232 if (!sbi->s_jquota_fmt) {
1233 printk(KERN_ERR "EXT3-fs: journaled quota format "
1234 "not specified.\n");
1238 if (sbi->s_jquota_fmt) {
1239 printk(KERN_ERR "EXT3-fs: journaled quota format "
1240 "specified with no journaling "
1249 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1252 struct ext3_sb_info *sbi = EXT3_SB(sb);
1255 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1256 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1257 "forcing read-only mode\n");
1262 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1263 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1264 "running e2fsck is recommended\n");
1265 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1266 printk (KERN_WARNING
1267 "EXT3-fs warning: mounting fs with errors, "
1268 "running e2fsck is recommended\n");
1269 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1270 le16_to_cpu(es->s_mnt_count) >=
1271 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1272 printk (KERN_WARNING
1273 "EXT3-fs warning: maximal mount count reached, "
1274 "running e2fsck is recommended\n");
1275 else if (le32_to_cpu(es->s_checkinterval) &&
1276 (le32_to_cpu(es->s_lastcheck) +
1277 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1278 printk (KERN_WARNING
1279 "EXT3-fs warning: checktime reached, "
1280 "running e2fsck is recommended\n");
1282 /* @@@ We _will_ want to clear the valid bit if we find
1283 inconsistencies, to force a fsck at reboot. But for
1284 a plain journaled filesystem we can keep it set as
1285 valid forever! :) */
1286 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1288 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1289 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1290 le16_add_cpu(&es->s_mnt_count, 1);
1291 es->s_mtime = cpu_to_le32(get_seconds());
1292 ext3_update_dynamic_rev(sb);
1293 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1295 ext3_commit_super(sb, es, 1);
1296 if (test_opt(sb, DEBUG))
1297 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1298 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1300 sbi->s_groups_count,
1301 EXT3_BLOCKS_PER_GROUP(sb),
1302 EXT3_INODES_PER_GROUP(sb),
1305 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1306 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1307 char b[BDEVNAME_SIZE];
1309 printk("external journal on %s\n",
1310 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1312 printk("internal journal\n");
1317 /* Called at mount-time, super-block is locked */
1318 static int ext3_check_descriptors(struct super_block *sb)
1320 struct ext3_sb_info *sbi = EXT3_SB(sb);
1323 ext3_debug ("Checking group descriptors");
1325 for (i = 0; i < sbi->s_groups_count; i++) {
1326 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1327 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1328 ext3_fsblk_t last_block;
1330 if (i == sbi->s_groups_count - 1)
1331 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1333 last_block = first_block +
1334 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1336 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1337 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1339 ext3_error (sb, "ext3_check_descriptors",
1340 "Block bitmap for group %d"
1341 " not in group (block %lu)!",
1343 le32_to_cpu(gdp->bg_block_bitmap));
1346 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1347 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1349 ext3_error (sb, "ext3_check_descriptors",
1350 "Inode bitmap for group %d"
1351 " not in group (block %lu)!",
1353 le32_to_cpu(gdp->bg_inode_bitmap));
1356 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1357 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1360 ext3_error (sb, "ext3_check_descriptors",
1361 "Inode table for group %d"
1362 " not in group (block %lu)!",
1364 le32_to_cpu(gdp->bg_inode_table));
1369 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1370 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1375 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1376 * the superblock) which were deleted from all directories, but held open by
1377 * a process at the time of a crash. We walk the list and try to delete these
1378 * inodes at recovery time (only with a read-write filesystem).
1380 * In order to keep the orphan inode chain consistent during traversal (in
1381 * case of crash during recovery), we link each inode into the superblock
1382 * orphan list_head and handle it the same way as an inode deletion during
1383 * normal operation (which journals the operations for us).
1385 * We only do an iget() and an iput() on each inode, which is very safe if we
1386 * accidentally point at an in-use or already deleted inode. The worst that
1387 * can happen in this case is that we get a "bit already cleared" message from
1388 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1389 * e2fsck was run on this filesystem, and it must have already done the orphan
1390 * inode cleanup for us, so we can safely abort without any further action.
1392 static void ext3_orphan_cleanup (struct super_block * sb,
1393 struct ext3_super_block * es)
1395 unsigned int s_flags = sb->s_flags;
1396 int nr_orphans = 0, nr_truncates = 0;
1400 if (!es->s_last_orphan) {
1401 jbd_debug(4, "no orphan inodes to clean up\n");
1405 if (bdev_read_only(sb->s_bdev)) {
1406 printk(KERN_ERR "EXT3-fs: write access "
1407 "unavailable, skipping orphan cleanup.\n");
1411 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1412 if (es->s_last_orphan)
1413 jbd_debug(1, "Errors on filesystem, "
1414 "clearing orphan list.\n");
1415 es->s_last_orphan = 0;
1416 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1420 if (s_flags & MS_RDONLY) {
1421 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1423 sb->s_flags &= ~MS_RDONLY;
1426 /* Needed for iput() to work correctly and not trash data */
1427 sb->s_flags |= MS_ACTIVE;
1428 /* Turn on quotas so that they are updated correctly */
1429 for (i = 0; i < MAXQUOTAS; i++) {
1430 if (EXT3_SB(sb)->s_qf_names[i]) {
1431 int ret = ext3_quota_on_mount(sb, i);
1434 "EXT3-fs: Cannot turn on journaled "
1435 "quota: error %d\n", ret);
1440 while (es->s_last_orphan) {
1441 struct inode *inode;
1443 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1444 if (IS_ERR(inode)) {
1445 es->s_last_orphan = 0;
1449 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1451 if (inode->i_nlink) {
1453 "%s: truncating inode %lu to %Ld bytes\n",
1454 __func__, inode->i_ino, inode->i_size);
1455 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1456 inode->i_ino, inode->i_size);
1457 ext3_truncate(inode);
1461 "%s: deleting unreferenced inode %lu\n",
1462 __func__, inode->i_ino);
1463 jbd_debug(2, "deleting unreferenced inode %lu\n",
1467 iput(inode); /* The delete magic happens here! */
1470 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1473 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1474 sb->s_id, PLURAL(nr_orphans));
1476 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1477 sb->s_id, PLURAL(nr_truncates));
1479 /* Turn quotas off */
1480 for (i = 0; i < MAXQUOTAS; i++) {
1481 if (sb_dqopt(sb)->files[i])
1482 vfs_quota_off(sb, i, 0);
1485 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1489 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1490 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1491 * We need to be 1 filesystem block less than the 2^32 sector limit.
1493 static loff_t ext3_max_size(int bits)
1495 loff_t res = EXT3_NDIR_BLOCKS;
1499 /* This is calculated to be the largest file size for a
1500 * dense, file such that the total number of
1501 * sectors in the file, including data and all indirect blocks,
1502 * does not exceed 2^32 -1
1503 * __u32 i_blocks representing the total number of
1504 * 512 bytes blocks of the file
1506 upper_limit = (1LL << 32) - 1;
1508 /* total blocks in file system block size */
1509 upper_limit >>= (bits - 9);
1512 /* indirect blocks */
1514 /* double indirect blocks */
1515 meta_blocks += 1 + (1LL << (bits-2));
1516 /* tripple indirect blocks */
1517 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1519 upper_limit -= meta_blocks;
1520 upper_limit <<= bits;
1522 res += 1LL << (bits-2);
1523 res += 1LL << (2*(bits-2));
1524 res += 1LL << (3*(bits-2));
1526 if (res > upper_limit)
1529 if (res > MAX_LFS_FILESIZE)
1530 res = MAX_LFS_FILESIZE;
1535 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1536 ext3_fsblk_t logic_sb_block,
1539 struct ext3_sb_info *sbi = EXT3_SB(sb);
1540 unsigned long bg, first_meta_bg;
1543 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1545 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1547 return (logic_sb_block + nr + 1);
1548 bg = sbi->s_desc_per_block * nr;
1549 if (ext3_bg_has_super(sb, bg))
1551 return (has_super + ext3_group_first_block_no(sb, bg));
1555 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1557 struct buffer_head * bh;
1558 struct ext3_super_block *es = NULL;
1559 struct ext3_sb_info *sbi;
1561 ext3_fsblk_t sb_block = get_sb_block(&data);
1562 ext3_fsblk_t logic_sb_block;
1563 unsigned long offset = 0;
1564 unsigned int journal_inum = 0;
1565 unsigned long journal_devnum = 0;
1566 unsigned long def_mount_opts;
1577 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1581 sbi->s_blockgroup_lock =
1582 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1583 if (!sbi->s_blockgroup_lock) {
1587 sb->s_fs_info = sbi;
1588 sbi->s_mount_opt = 0;
1589 sbi->s_resuid = EXT3_DEF_RESUID;
1590 sbi->s_resgid = EXT3_DEF_RESGID;
1591 sbi->s_sb_block = sb_block;
1595 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1597 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1602 * The ext3 superblock will not be buffer aligned for other than 1kB
1603 * block sizes. We need to calculate the offset from buffer start.
1605 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1606 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1607 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1609 logic_sb_block = sb_block;
1612 if (!(bh = sb_bread(sb, logic_sb_block))) {
1613 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1617 * Note: s_es must be initialized as soon as possible because
1618 * some ext3 macro-instructions depend on its value
1620 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1622 sb->s_magic = le16_to_cpu(es->s_magic);
1623 if (sb->s_magic != EXT3_SUPER_MAGIC)
1626 /* Set defaults before we parse the mount options */
1627 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1628 if (def_mount_opts & EXT3_DEFM_DEBUG)
1629 set_opt(sbi->s_mount_opt, DEBUG);
1630 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1631 set_opt(sbi->s_mount_opt, GRPID);
1632 if (def_mount_opts & EXT3_DEFM_UID16)
1633 set_opt(sbi->s_mount_opt, NO_UID32);
1634 #ifdef CONFIG_EXT3_FS_XATTR
1635 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1636 set_opt(sbi->s_mount_opt, XATTR_USER);
1638 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1639 if (def_mount_opts & EXT3_DEFM_ACL)
1640 set_opt(sbi->s_mount_opt, POSIX_ACL);
1642 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1643 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1644 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1645 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1646 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1647 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1649 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1650 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1651 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1652 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1654 set_opt(sbi->s_mount_opt, ERRORS_RO);
1656 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1657 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1659 set_opt(sbi->s_mount_opt, RESERVATION);
1661 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1665 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1666 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1668 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1669 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1670 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1671 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1673 "EXT3-fs warning: feature flags set on rev 0 fs, "
1674 "running e2fsck is recommended\n");
1676 * Check feature flags regardless of the revision level, since we
1677 * previously didn't change the revision level when setting the flags,
1678 * so there is a chance incompat flags are set on a rev 0 filesystem.
1680 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1682 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1683 "unsupported optional features (%x).\n",
1684 sb->s_id, le32_to_cpu(features));
1687 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1688 if (!(sb->s_flags & MS_RDONLY) && features) {
1689 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1690 "unsupported optional features (%x).\n",
1691 sb->s_id, le32_to_cpu(features));
1694 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1696 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1697 blocksize > EXT3_MAX_BLOCK_SIZE) {
1699 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1700 blocksize, sb->s_id);
1704 hblock = bdev_logical_block_size(sb->s_bdev);
1705 if (sb->s_blocksize != blocksize) {
1707 * Make sure the blocksize for the filesystem is larger
1708 * than the hardware sectorsize for the machine.
1710 if (blocksize < hblock) {
1711 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1712 "device blocksize %d.\n", blocksize, hblock);
1717 if (!sb_set_blocksize(sb, blocksize)) {
1718 printk(KERN_ERR "EXT3-fs: bad blocksize %d.\n",
1722 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1723 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1724 bh = sb_bread(sb, logic_sb_block);
1727 "EXT3-fs: Can't read superblock on 2nd try.\n");
1730 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1732 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1734 "EXT3-fs: Magic mismatch, very weird !\n");
1739 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1741 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1742 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1743 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1745 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1746 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1747 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1748 (!is_power_of_2(sbi->s_inode_size)) ||
1749 (sbi->s_inode_size > blocksize)) {
1751 "EXT3-fs: unsupported inode size: %d\n",
1756 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1757 le32_to_cpu(es->s_log_frag_size);
1758 if (blocksize != sbi->s_frag_size) {
1760 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1761 sbi->s_frag_size, blocksize);
1764 sbi->s_frags_per_block = 1;
1765 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1766 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1767 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1768 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1770 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1771 if (sbi->s_inodes_per_block == 0)
1773 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1774 sbi->s_inodes_per_block;
1775 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1777 sbi->s_mount_state = le16_to_cpu(es->s_state);
1778 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1779 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1780 for (i=0; i < 4; i++)
1781 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1782 sbi->s_def_hash_version = es->s_def_hash_version;
1783 i = le32_to_cpu(es->s_flags);
1784 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1785 sbi->s_hash_unsigned = 3;
1786 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1787 #ifdef __CHAR_UNSIGNED__
1788 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1789 sbi->s_hash_unsigned = 3;
1791 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1795 if (sbi->s_blocks_per_group > blocksize * 8) {
1797 "EXT3-fs: #blocks per group too big: %lu\n",
1798 sbi->s_blocks_per_group);
1801 if (sbi->s_frags_per_group > blocksize * 8) {
1803 "EXT3-fs: #fragments per group too big: %lu\n",
1804 sbi->s_frags_per_group);
1807 if (sbi->s_inodes_per_group > blocksize * 8) {
1809 "EXT3-fs: #inodes per group too big: %lu\n",
1810 sbi->s_inodes_per_group);
1814 if (le32_to_cpu(es->s_blocks_count) >
1815 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1816 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1817 " too large to mount safely\n", sb->s_id);
1818 if (sizeof(sector_t) < 8)
1819 printk(KERN_WARNING "EXT3-fs: CONFIG_LBDAF not "
1824 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1826 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1827 le32_to_cpu(es->s_first_data_block) - 1)
1828 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1829 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1830 EXT3_DESC_PER_BLOCK(sb);
1831 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1833 if (sbi->s_group_desc == NULL) {
1834 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1838 bgl_lock_init(sbi->s_blockgroup_lock);
1840 for (i = 0; i < db_count; i++) {
1841 block = descriptor_loc(sb, logic_sb_block, i);
1842 sbi->s_group_desc[i] = sb_bread(sb, block);
1843 if (!sbi->s_group_desc[i]) {
1844 printk (KERN_ERR "EXT3-fs: "
1845 "can't read group descriptor %d\n", i);
1850 if (!ext3_check_descriptors (sb)) {
1851 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1854 sbi->s_gdb_count = db_count;
1855 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1856 spin_lock_init(&sbi->s_next_gen_lock);
1858 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1859 ext3_count_free_blocks(sb));
1861 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1862 ext3_count_free_inodes(sb));
1865 err = percpu_counter_init(&sbi->s_dirs_counter,
1866 ext3_count_dirs(sb));
1869 printk(KERN_ERR "EXT3-fs: insufficient memory\n");
1873 /* per fileystem reservation list head & lock */
1874 spin_lock_init(&sbi->s_rsv_window_lock);
1875 sbi->s_rsv_window_root = RB_ROOT;
1876 /* Add a single, static dummy reservation to the start of the
1877 * reservation window list --- it gives us a placeholder for
1878 * append-at-start-of-list which makes the allocation logic
1879 * _much_ simpler. */
1880 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1881 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1882 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1883 sbi->s_rsv_window_head.rsv_goal_size = 0;
1884 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1887 * set up enough so that it can read an inode
1889 sb->s_op = &ext3_sops;
1890 sb->s_export_op = &ext3_export_ops;
1891 sb->s_xattr = ext3_xattr_handlers;
1893 sb->s_qcop = &ext3_qctl_operations;
1894 sb->dq_op = &ext3_quota_operations;
1896 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1900 needs_recovery = (es->s_last_orphan != 0 ||
1901 EXT3_HAS_INCOMPAT_FEATURE(sb,
1902 EXT3_FEATURE_INCOMPAT_RECOVER));
1905 * The first inode we look at is the journal inode. Don't try
1906 * root first: it may be modified in the journal!
1908 if (!test_opt(sb, NOLOAD) &&
1909 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1910 if (ext3_load_journal(sb, es, journal_devnum))
1912 } else if (journal_inum) {
1913 if (ext3_create_journal(sb, es, journal_inum))
1918 "ext3: No journal on filesystem on %s\n",
1923 /* We have now updated the journal if required, so we can
1924 * validate the data journaling mode. */
1925 switch (test_opt(sb, DATA_FLAGS)) {
1927 /* No mode set, assume a default based on the journal
1928 capabilities: ORDERED_DATA if the journal can
1929 cope, else JOURNAL_DATA */
1930 if (journal_check_available_features
1931 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1932 set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
1934 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1937 case EXT3_MOUNT_ORDERED_DATA:
1938 case EXT3_MOUNT_WRITEBACK_DATA:
1939 if (!journal_check_available_features
1940 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1941 printk(KERN_ERR "EXT3-fs: Journal does not support "
1942 "requested data journaling mode\n");
1949 if (test_opt(sb, NOBH)) {
1950 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1951 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1952 "its supported only with writeback mode\n");
1953 clear_opt(sbi->s_mount_opt, NOBH);
1957 * The journal_load will have done any necessary log recovery,
1958 * so we can safely mount the rest of the filesystem now.
1961 root = ext3_iget(sb, EXT3_ROOT_INO);
1963 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1964 ret = PTR_ERR(root);
1967 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1969 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1972 sb->s_root = d_alloc_root(root);
1974 printk(KERN_ERR "EXT3-fs: get root dentry failed\n");
1980 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1982 * akpm: core read_super() calls in here with the superblock locked.
1983 * That deadlocks, because orphan cleanup needs to lock the superblock
1984 * in numerous places. Here we just pop the lock - it's relatively
1985 * harmless, because we are now ready to accept write_super() requests,
1986 * and aviro says that's the only reason for hanging onto the
1989 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1990 ext3_orphan_cleanup(sb, es);
1991 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1993 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1994 ext3_mark_recovery_complete(sb, es);
1995 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1996 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1997 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2005 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
2010 journal_destroy(sbi->s_journal);
2012 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2013 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2014 percpu_counter_destroy(&sbi->s_dirs_counter);
2016 for (i = 0; i < db_count; i++)
2017 brelse(sbi->s_group_desc[i]);
2018 kfree(sbi->s_group_desc);
2021 for (i = 0; i < MAXQUOTAS; i++)
2022 kfree(sbi->s_qf_names[i]);
2024 ext3_blkdev_remove(sbi);
2027 sb->s_fs_info = NULL;
2028 kfree(sbi->s_blockgroup_lock);
2035 * Setup any per-fs journal parameters now. We'll do this both on
2036 * initial mount, once the journal has been initialised but before we've
2037 * done any recovery; and again on any subsequent remount.
2039 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2041 struct ext3_sb_info *sbi = EXT3_SB(sb);
2043 if (sbi->s_commit_interval)
2044 journal->j_commit_interval = sbi->s_commit_interval;
2045 /* We could also set up an ext3-specific default for the commit
2046 * interval here, but for now we'll just fall back to the jbd
2049 spin_lock(&journal->j_state_lock);
2050 if (test_opt(sb, BARRIER))
2051 journal->j_flags |= JFS_BARRIER;
2053 journal->j_flags &= ~JFS_BARRIER;
2054 if (test_opt(sb, DATA_ERR_ABORT))
2055 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2057 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2058 spin_unlock(&journal->j_state_lock);
2061 static journal_t *ext3_get_journal(struct super_block *sb,
2062 unsigned int journal_inum)
2064 struct inode *journal_inode;
2067 /* First, test for the existence of a valid inode on disk. Bad
2068 * things happen if we iget() an unused inode, as the subsequent
2069 * iput() will try to delete it. */
2071 journal_inode = ext3_iget(sb, journal_inum);
2072 if (IS_ERR(journal_inode)) {
2073 printk(KERN_ERR "EXT3-fs: no journal found.\n");
2076 if (!journal_inode->i_nlink) {
2077 make_bad_inode(journal_inode);
2078 iput(journal_inode);
2079 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
2083 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2084 journal_inode, journal_inode->i_size);
2085 if (!S_ISREG(journal_inode->i_mode)) {
2086 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
2087 iput(journal_inode);
2091 journal = journal_init_inode(journal_inode);
2093 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
2094 iput(journal_inode);
2097 journal->j_private = sb;
2098 ext3_init_journal_params(sb, journal);
2102 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2105 struct buffer_head * bh;
2109 int hblock, blocksize;
2110 ext3_fsblk_t sb_block;
2111 unsigned long offset;
2112 struct ext3_super_block * es;
2113 struct block_device *bdev;
2115 bdev = ext3_blkdev_get(j_dev);
2119 if (bd_claim(bdev, sb)) {
2121 "EXT3: failed to claim external journal device.\n");
2122 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
2126 blocksize = sb->s_blocksize;
2127 hblock = bdev_logical_block_size(bdev);
2128 if (blocksize < hblock) {
2130 "EXT3-fs: blocksize too small for journal device.\n");
2134 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2135 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2136 set_blocksize(bdev, blocksize);
2137 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2138 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
2139 "external journal\n");
2143 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2144 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2145 !(le32_to_cpu(es->s_feature_incompat) &
2146 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2147 printk(KERN_ERR "EXT3-fs: external journal has "
2148 "bad superblock\n");
2153 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2154 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
2159 len = le32_to_cpu(es->s_blocks_count);
2160 start = sb_block + 1;
2161 brelse(bh); /* we're done with the superblock */
2163 journal = journal_init_dev(bdev, sb->s_bdev,
2164 start, len, blocksize);
2166 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
2169 journal->j_private = sb;
2170 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2171 wait_on_buffer(journal->j_sb_buffer);
2172 if (!buffer_uptodate(journal->j_sb_buffer)) {
2173 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
2176 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2177 printk(KERN_ERR "EXT3-fs: External journal has more than one "
2178 "user (unsupported) - %d\n",
2179 be32_to_cpu(journal->j_superblock->s_nr_users));
2182 EXT3_SB(sb)->journal_bdev = bdev;
2183 ext3_init_journal_params(sb, journal);
2186 journal_destroy(journal);
2188 ext3_blkdev_put(bdev);
2192 static int ext3_load_journal(struct super_block *sb,
2193 struct ext3_super_block *es,
2194 unsigned long journal_devnum)
2197 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2200 int really_read_only;
2202 if (journal_devnum &&
2203 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2204 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
2205 "numbers have changed\n");
2206 journal_dev = new_decode_dev(journal_devnum);
2208 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2210 really_read_only = bdev_read_only(sb->s_bdev);
2213 * Are we loading a blank journal or performing recovery after a
2214 * crash? For recovery, we need to check in advance whether we
2215 * can get read-write access to the device.
2218 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2219 if (sb->s_flags & MS_RDONLY) {
2220 printk(KERN_INFO "EXT3-fs: INFO: recovery "
2221 "required on readonly filesystem.\n");
2222 if (really_read_only) {
2223 printk(KERN_ERR "EXT3-fs: write access "
2224 "unavailable, cannot proceed.\n");
2227 printk (KERN_INFO "EXT3-fs: write access will "
2228 "be enabled during recovery.\n");
2232 if (journal_inum && journal_dev) {
2233 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2234 "and inode journals!\n");
2239 if (!(journal = ext3_get_journal(sb, journal_inum)))
2242 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2246 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2247 err = journal_update_format(journal);
2249 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2250 journal_destroy(journal);
2255 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2256 err = journal_wipe(journal, !really_read_only);
2258 err = journal_load(journal);
2261 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2262 journal_destroy(journal);
2266 EXT3_SB(sb)->s_journal = journal;
2267 ext3_clear_journal_err(sb, es);
2269 if (journal_devnum &&
2270 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2271 es->s_journal_dev = cpu_to_le32(journal_devnum);
2273 /* Make sure we flush the recovery flag to disk. */
2274 ext3_commit_super(sb, es, 1);
2280 static int ext3_create_journal(struct super_block * sb,
2281 struct ext3_super_block * es,
2282 unsigned int journal_inum)
2287 if (sb->s_flags & MS_RDONLY) {
2288 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2289 "create journal.\n");
2293 journal = ext3_get_journal(sb, journal_inum);
2297 printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
2300 err = journal_create(journal);
2302 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2303 journal_destroy(journal);
2307 EXT3_SB(sb)->s_journal = journal;
2309 ext3_update_dynamic_rev(sb);
2310 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2311 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2313 es->s_journal_inum = cpu_to_le32(journal_inum);
2315 /* Make sure we flush the recovery flag to disk. */
2316 ext3_commit_super(sb, es, 1);
2321 static int ext3_commit_super(struct super_block *sb,
2322 struct ext3_super_block *es,
2325 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2331 * If the file system is mounted read-only, don't update the
2332 * superblock write time. This avoids updating the superblock
2333 * write time when we are mounting the root file system
2334 * read/only but we need to replay the journal; at that point,
2335 * for people who are east of GMT and who make their clock
2336 * tick in localtime for Windows bug-for-bug compatibility,
2337 * the clock is set in the future, and this will cause e2fsck
2338 * to complain and force a full file system check.
2340 if (!(sb->s_flags & MS_RDONLY))
2341 es->s_wtime = cpu_to_le32(get_seconds());
2342 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2343 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2344 BUFFER_TRACE(sbh, "marking dirty");
2345 mark_buffer_dirty(sbh);
2347 error = sync_dirty_buffer(sbh);
2353 * Have we just finished recovery? If so, and if we are mounting (or
2354 * remounting) the filesystem readonly, then we will end up with a
2355 * consistent fs on disk. Record that fact.
2357 static void ext3_mark_recovery_complete(struct super_block * sb,
2358 struct ext3_super_block * es)
2360 journal_t *journal = EXT3_SB(sb)->s_journal;
2362 journal_lock_updates(journal);
2363 if (journal_flush(journal) < 0)
2367 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2368 sb->s_flags & MS_RDONLY) {
2369 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2370 ext3_commit_super(sb, es, 1);
2375 journal_unlock_updates(journal);
2379 * If we are mounting (or read-write remounting) a filesystem whose journal
2380 * has recorded an error from a previous lifetime, move that error to the
2381 * main filesystem now.
2383 static void ext3_clear_journal_err(struct super_block * sb,
2384 struct ext3_super_block * es)
2390 journal = EXT3_SB(sb)->s_journal;
2393 * Now check for any error status which may have been recorded in the
2394 * journal by a prior ext3_error() or ext3_abort()
2397 j_errno = journal_errno(journal);
2401 errstr = ext3_decode_error(sb, j_errno, nbuf);
2402 ext3_warning(sb, __func__, "Filesystem error recorded "
2403 "from previous mount: %s", errstr);
2404 ext3_warning(sb, __func__, "Marking fs in need of "
2405 "filesystem check.");
2407 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2408 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2409 ext3_commit_super (sb, es, 1);
2411 journal_clear_err(journal);
2416 * Force the running and committing transactions to commit,
2417 * and wait on the commit.
2419 int ext3_force_commit(struct super_block *sb)
2424 if (sb->s_flags & MS_RDONLY)
2427 journal = EXT3_SB(sb)->s_journal;
2428 ret = ext3_journal_force_commit(journal);
2432 static int ext3_sync_fs(struct super_block *sb, int wait)
2436 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2438 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2444 * LVM calls this function before a (read-only) snapshot is created. This
2445 * gives us a chance to flush the journal completely and mark the fs clean.
2447 static int ext3_freeze(struct super_block *sb)
2452 if (!(sb->s_flags & MS_RDONLY)) {
2453 journal = EXT3_SB(sb)->s_journal;
2455 /* Now we set up the journal barrier. */
2456 journal_lock_updates(journal);
2459 * We don't want to clear needs_recovery flag when we failed
2460 * to flush the journal.
2462 error = journal_flush(journal);
2466 /* Journal blocked and flushed, clear needs_recovery flag. */
2467 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2468 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2475 journal_unlock_updates(journal);
2480 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2481 * flag here, even though the filesystem is not technically dirty yet.
2483 static int ext3_unfreeze(struct super_block *sb)
2485 if (!(sb->s_flags & MS_RDONLY)) {
2487 /* Reser the needs_recovery flag before the fs is unlocked. */
2488 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2489 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2491 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2496 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2498 struct ext3_super_block * es;
2499 struct ext3_sb_info *sbi = EXT3_SB(sb);
2500 ext3_fsblk_t n_blocks_count = 0;
2501 unsigned long old_sb_flags;
2502 struct ext3_mount_options old_opts;
2510 /* Store the original options */
2512 old_sb_flags = sb->s_flags;
2513 old_opts.s_mount_opt = sbi->s_mount_opt;
2514 old_opts.s_resuid = sbi->s_resuid;
2515 old_opts.s_resgid = sbi->s_resgid;
2516 old_opts.s_commit_interval = sbi->s_commit_interval;
2518 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2519 for (i = 0; i < MAXQUOTAS; i++)
2520 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2524 * Allow the "check" option to be passed as a remount option.
2526 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2531 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2532 ext3_abort(sb, __func__, "Abort forced by user");
2534 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2535 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2539 ext3_init_journal_params(sb, sbi->s_journal);
2541 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2542 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2543 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2548 if (*flags & MS_RDONLY) {
2550 * First of all, the unconditional stuff we have to do
2551 * to disable replay of the journal when we next remount
2553 sb->s_flags |= MS_RDONLY;
2556 * OK, test if we are remounting a valid rw partition
2557 * readonly, and if so set the rdonly flag and then
2558 * mark the partition as valid again.
2560 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2561 (sbi->s_mount_state & EXT3_VALID_FS))
2562 es->s_state = cpu_to_le16(sbi->s_mount_state);
2565 * We have to unlock super so that we can wait for
2569 ext3_mark_recovery_complete(sb, es);
2573 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2574 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2575 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2576 "remount RDWR because of unsupported "
2577 "optional features (%x).\n",
2578 sb->s_id, le32_to_cpu(ret));
2584 * If we have an unprocessed orphan list hanging
2585 * around from a previously readonly bdev mount,
2586 * require a full umount/remount for now.
2588 if (es->s_last_orphan) {
2589 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2590 "remount RDWR because of unprocessed "
2591 "orphan inode list. Please "
2592 "umount/remount instead.\n",
2599 * Mounting a RDONLY partition read-write, so reread
2600 * and store the current valid flag. (It may have
2601 * been changed by e2fsck since we originally mounted
2604 ext3_clear_journal_err(sb, es);
2605 sbi->s_mount_state = le16_to_cpu(es->s_state);
2606 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2608 if (!ext3_setup_super (sb, es, 0))
2609 sb->s_flags &= ~MS_RDONLY;
2613 /* Release old quota file names */
2614 for (i = 0; i < MAXQUOTAS; i++)
2615 if (old_opts.s_qf_names[i] &&
2616 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2617 kfree(old_opts.s_qf_names[i]);
2623 sb->s_flags = old_sb_flags;
2624 sbi->s_mount_opt = old_opts.s_mount_opt;
2625 sbi->s_resuid = old_opts.s_resuid;
2626 sbi->s_resgid = old_opts.s_resgid;
2627 sbi->s_commit_interval = old_opts.s_commit_interval;
2629 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2630 for (i = 0; i < MAXQUOTAS; i++) {
2631 if (sbi->s_qf_names[i] &&
2632 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2633 kfree(sbi->s_qf_names[i]);
2634 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2642 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2644 struct super_block *sb = dentry->d_sb;
2645 struct ext3_sb_info *sbi = EXT3_SB(sb);
2646 struct ext3_super_block *es = sbi->s_es;
2649 if (test_opt(sb, MINIX_DF)) {
2650 sbi->s_overhead_last = 0;
2651 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2652 unsigned long ngroups = sbi->s_groups_count, i;
2653 ext3_fsblk_t overhead = 0;
2657 * Compute the overhead (FS structures). This is constant
2658 * for a given filesystem unless the number of block groups
2659 * changes so we cache the previous value until it does.
2663 * All of the blocks before first_data_block are
2666 overhead = le32_to_cpu(es->s_first_data_block);
2669 * Add the overhead attributed to the superblock and
2670 * block group descriptors. If the sparse superblocks
2671 * feature is turned on, then not all groups have this.
2673 for (i = 0; i < ngroups; i++) {
2674 overhead += ext3_bg_has_super(sb, i) +
2675 ext3_bg_num_gdb(sb, i);
2680 * Every block group has an inode bitmap, a block
2681 * bitmap, and an inode table.
2683 overhead += ngroups * (2 + sbi->s_itb_per_group);
2684 sbi->s_overhead_last = overhead;
2686 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2689 buf->f_type = EXT3_SUPER_MAGIC;
2690 buf->f_bsize = sb->s_blocksize;
2691 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2692 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2693 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2694 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2696 buf->f_files = le32_to_cpu(es->s_inodes_count);
2697 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2698 buf->f_namelen = EXT3_NAME_LEN;
2699 fsid = le64_to_cpup((void *)es->s_uuid) ^
2700 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2701 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2702 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2706 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2707 * is locked for write. Otherwise the are possible deadlocks:
2708 * Process 1 Process 2
2709 * ext3_create() quota_sync()
2710 * journal_start() write_dquot()
2711 * vfs_dq_init() down(dqio_mutex)
2712 * down(dqio_mutex) journal_start()
2718 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2720 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2723 static int ext3_write_dquot(struct dquot *dquot)
2727 struct inode *inode;
2729 inode = dquot_to_inode(dquot);
2730 handle = ext3_journal_start(inode,
2731 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2733 return PTR_ERR(handle);
2734 ret = dquot_commit(dquot);
2735 err = ext3_journal_stop(handle);
2741 static int ext3_acquire_dquot(struct dquot *dquot)
2746 handle = ext3_journal_start(dquot_to_inode(dquot),
2747 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2749 return PTR_ERR(handle);
2750 ret = dquot_acquire(dquot);
2751 err = ext3_journal_stop(handle);
2757 static int ext3_release_dquot(struct dquot *dquot)
2762 handle = ext3_journal_start(dquot_to_inode(dquot),
2763 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2764 if (IS_ERR(handle)) {
2765 /* Release dquot anyway to avoid endless cycle in dqput() */
2766 dquot_release(dquot);
2767 return PTR_ERR(handle);
2769 ret = dquot_release(dquot);
2770 err = ext3_journal_stop(handle);
2776 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2778 /* Are we journaling quotas? */
2779 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2780 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2781 dquot_mark_dquot_dirty(dquot);
2782 return ext3_write_dquot(dquot);
2784 return dquot_mark_dquot_dirty(dquot);
2788 static int ext3_write_info(struct super_block *sb, int type)
2793 /* Data block + inode block */
2794 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2796 return PTR_ERR(handle);
2797 ret = dquot_commit_info(sb, type);
2798 err = ext3_journal_stop(handle);
2805 * Turn on quotas during mount time - we need to find
2806 * the quota file and such...
2808 static int ext3_quota_on_mount(struct super_block *sb, int type)
2810 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2811 EXT3_SB(sb)->s_jquota_fmt, type);
2815 * Standard function to be called on quota_on
2817 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2818 char *name, int remount)
2823 if (!test_opt(sb, QUOTA))
2825 /* When remounting, no checks are needed and in fact, name is NULL */
2827 return vfs_quota_on(sb, type, format_id, name, remount);
2829 err = kern_path(name, LOOKUP_FOLLOW, &path);
2833 /* Quotafile not on the same filesystem? */
2834 if (path.mnt->mnt_sb != sb) {
2838 /* Journaling quota? */
2839 if (EXT3_SB(sb)->s_qf_names[type]) {
2840 /* Quotafile not of fs root? */
2841 if (path.dentry->d_parent != sb->s_root)
2843 "EXT3-fs: Quota file not on filesystem root. "
2844 "Journaled quota will not work.\n");
2848 * When we journal data on quota file, we have to flush journal to see
2849 * all updates to the file when we bypass pagecache...
2851 if (ext3_should_journal_data(path.dentry->d_inode)) {
2853 * We don't need to lock updates but journal_flush() could
2854 * otherwise be livelocked...
2856 journal_lock_updates(EXT3_SB(sb)->s_journal);
2857 err = journal_flush(EXT3_SB(sb)->s_journal);
2858 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2865 err = vfs_quota_on_path(sb, type, format_id, &path);
2870 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2871 * acquiring the locks... As quota files are never truncated and quota code
2872 * itself serializes the operations (and noone else should touch the files)
2873 * we don't have to be afraid of races */
2874 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2875 size_t len, loff_t off)
2877 struct inode *inode = sb_dqopt(sb)->files[type];
2878 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2880 int offset = off & (sb->s_blocksize - 1);
2883 struct buffer_head *bh;
2884 loff_t i_size = i_size_read(inode);
2888 if (off+len > i_size)
2891 while (toread > 0) {
2892 tocopy = sb->s_blocksize - offset < toread ?
2893 sb->s_blocksize - offset : toread;
2894 bh = ext3_bread(NULL, inode, blk, 0, &err);
2897 if (!bh) /* A hole? */
2898 memset(data, 0, tocopy);
2900 memcpy(data, bh->b_data+offset, tocopy);
2910 /* Write to quotafile (we know the transaction is already started and has
2911 * enough credits) */
2912 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2913 const char *data, size_t len, loff_t off)
2915 struct inode *inode = sb_dqopt(sb)->files[type];
2916 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2918 int offset = off & (sb->s_blocksize - 1);
2920 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2921 size_t towrite = len;
2922 struct buffer_head *bh;
2923 handle_t *handle = journal_current_handle();
2926 printk(KERN_WARNING "EXT3-fs: Quota write (off=%Lu, len=%Lu)"
2927 " cancelled because transaction is not started.\n",
2928 (unsigned long long)off, (unsigned long long)len);
2931 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2932 while (towrite > 0) {
2933 tocopy = sb->s_blocksize - offset < towrite ?
2934 sb->s_blocksize - offset : towrite;
2935 bh = ext3_bread(handle, inode, blk, 1, &err);
2938 if (journal_quota) {
2939 err = ext3_journal_get_write_access(handle, bh);
2946 memcpy(bh->b_data+offset, data, tocopy);
2947 flush_dcache_page(bh->b_page);
2950 err = ext3_journal_dirty_metadata(handle, bh);
2952 /* Always do at least ordered writes for quotas */
2953 err = ext3_journal_dirty_data(handle, bh);
2954 mark_buffer_dirty(bh);
2965 if (len == towrite) {
2966 mutex_unlock(&inode->i_mutex);
2969 if (inode->i_size < off+len-towrite) {
2970 i_size_write(inode, off+len-towrite);
2971 EXT3_I(inode)->i_disksize = inode->i_size;
2974 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2975 ext3_mark_inode_dirty(handle, inode);
2976 mutex_unlock(&inode->i_mutex);
2977 return len - towrite;
2982 static int ext3_get_sb(struct file_system_type *fs_type,
2983 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2985 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2988 static struct file_system_type ext3_fs_type = {
2989 .owner = THIS_MODULE,
2991 .get_sb = ext3_get_sb,
2992 .kill_sb = kill_block_super,
2993 .fs_flags = FS_REQUIRES_DEV,
2996 static int __init init_ext3_fs(void)
2998 int err = init_ext3_xattr();
3001 err = init_inodecache();
3004 err = register_filesystem(&ext3_fs_type);
3009 destroy_inodecache();
3015 static void __exit exit_ext3_fs(void)
3017 unregister_filesystem(&ext3_fs_type);
3018 destroy_inodecache();
3022 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3023 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3024 MODULE_LICENSE("GPL");
3025 module_init(init_ext3_fs)
3026 module_exit(exit_ext3_fs)