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 "EXT3-fs: %s: aborting transaction: %s in %s\n",
139 caller, errstr, err_fn);
141 journal_abort_handle(handle);
144 void ext3_msg(struct super_block *sb, const char *prefix,
145 const char *fmt, ...)
150 printk("%sEXT3-fs (%s): ", prefix, sb->s_id);
156 /* Deal with the reporting of failure conditions on a filesystem such as
157 * inconsistencies detected or read IO failures.
159 * On ext2, we can store the error state of the filesystem in the
160 * superblock. That is not possible on ext3, because we may have other
161 * write ordering constraints on the superblock which prevent us from
162 * writing it out straight away; and given that the journal is about to
163 * be aborted, we can't rely on the current, or future, transactions to
164 * write out the superblock safely.
166 * We'll just use the journal_abort() error code to record an error in
167 * the journal instead. On recovery, the journal will complain about
168 * that error until we've noted it down and cleared it.
171 static void ext3_handle_error(struct super_block *sb)
173 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
175 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
176 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
178 if (sb->s_flags & MS_RDONLY)
181 if (!test_opt (sb, ERRORS_CONT)) {
182 journal_t *journal = EXT3_SB(sb)->s_journal;
184 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
186 journal_abort(journal, -EIO);
188 if (test_opt (sb, ERRORS_RO)) {
189 ext3_msg(sb, KERN_CRIT,
190 "error: remounting filesystem read-only");
191 sb->s_flags |= MS_RDONLY;
193 ext3_commit_super(sb, es, 1);
194 if (test_opt(sb, ERRORS_PANIC))
195 panic("EXT3-fs (%s): panic forced after error\n",
199 void ext3_error (struct super_block * sb, const char * function,
200 const char * fmt, ...)
205 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
210 ext3_handle_error(sb);
213 static const char *ext3_decode_error(struct super_block * sb, int errno,
220 errstr = "IO failure";
223 errstr = "Out of memory";
226 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
227 errstr = "Journal has aborted";
229 errstr = "Readonly filesystem";
232 /* If the caller passed in an extra buffer for unknown
233 * errors, textualise them now. Else we just return
236 /* Check for truncated error codes... */
237 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
246 /* __ext3_std_error decodes expected errors from journaling functions
247 * automatically and invokes the appropriate error response. */
249 void __ext3_std_error (struct super_block * sb, const char * function,
255 /* Special case: if the error is EROFS, and we're not already
256 * inside a transaction, then there's really no point in logging
258 if (errno == -EROFS && journal_current_handle() == NULL &&
259 (sb->s_flags & MS_RDONLY))
262 errstr = ext3_decode_error(sb, errno, nbuf);
263 ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
265 ext3_handle_error(sb);
269 * ext3_abort is a much stronger failure handler than ext3_error. The
270 * abort function may be used to deal with unrecoverable failures such
271 * as journal IO errors or ENOMEM at a critical moment in log management.
273 * We unconditionally force the filesystem into an ABORT|READONLY state,
274 * unless the error response on the fs has been set to panic in which
275 * case we take the easy way out and panic immediately.
278 void ext3_abort (struct super_block * sb, const char * function,
279 const char * fmt, ...)
284 printk(KERN_CRIT "EXT3-fs (%s): error: %s: ", sb->s_id, function);
289 if (test_opt(sb, ERRORS_PANIC))
290 panic("EXT3-fs: panic from previous error\n");
292 if (sb->s_flags & MS_RDONLY)
295 ext3_msg(sb, KERN_CRIT,
296 "error: remounting filesystem read-only");
297 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
298 sb->s_flags |= MS_RDONLY;
299 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
300 if (EXT3_SB(sb)->s_journal)
301 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
304 void ext3_warning (struct super_block * sb, const char * function,
305 const char * fmt, ...)
310 printk(KERN_WARNING "EXT3-fs (%s): warning: %s: ",
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 = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
356 ext3_msg(sb, "error: failed to open journal device %s: %ld",
357 __bdevname(dev, b), PTR_ERR(bdev));
363 * Release the journal device
365 static int ext3_blkdev_put(struct block_device *bdev)
368 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
371 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
373 struct block_device *bdev;
376 bdev = sbi->journal_bdev;
378 ret = ext3_blkdev_put(bdev);
379 sbi->journal_bdev = NULL;
384 static inline struct inode *orphan_list_entry(struct list_head *l)
386 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
389 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
393 ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
394 le32_to_cpu(sbi->s_es->s_last_orphan));
396 ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
397 list_for_each(l, &sbi->s_orphan) {
398 struct inode *inode = orphan_list_entry(l);
399 ext3_msg(sb, KERN_ERR, " "
400 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
401 inode->i_sb->s_id, inode->i_ino, inode,
402 inode->i_mode, inode->i_nlink,
407 static void ext3_put_super (struct super_block * sb)
409 struct ext3_sb_info *sbi = EXT3_SB(sb);
410 struct ext3_super_block *es = sbi->s_es;
413 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
417 ext3_xattr_put_super(sb);
418 err = journal_destroy(sbi->s_journal);
419 sbi->s_journal = NULL;
421 ext3_abort(sb, __func__, "Couldn't clean up the journal");
423 if (!(sb->s_flags & MS_RDONLY)) {
424 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
425 es->s_state = cpu_to_le16(sbi->s_mount_state);
426 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
427 mark_buffer_dirty(sbi->s_sbh);
428 ext3_commit_super(sb, es, 1);
431 for (i = 0; i < sbi->s_gdb_count; i++)
432 brelse(sbi->s_group_desc[i]);
433 kfree(sbi->s_group_desc);
434 percpu_counter_destroy(&sbi->s_freeblocks_counter);
435 percpu_counter_destroy(&sbi->s_freeinodes_counter);
436 percpu_counter_destroy(&sbi->s_dirs_counter);
439 for (i = 0; i < MAXQUOTAS; i++)
440 kfree(sbi->s_qf_names[i]);
443 /* Debugging code just in case the in-memory inode orphan list
444 * isn't empty. The on-disk one can be non-empty if we've
445 * detected an error and taken the fs readonly, but the
446 * in-memory list had better be clean by this point. */
447 if (!list_empty(&sbi->s_orphan))
448 dump_orphan_list(sb, sbi);
449 J_ASSERT(list_empty(&sbi->s_orphan));
451 invalidate_bdev(sb->s_bdev);
452 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
454 * Invalidate the journal device's buffers. We don't want them
455 * floating about in memory - the physical journal device may
456 * hotswapped, and it breaks the `ro-after' testing code.
458 sync_blockdev(sbi->journal_bdev);
459 invalidate_bdev(sbi->journal_bdev);
460 ext3_blkdev_remove(sbi);
462 sb->s_fs_info = NULL;
463 kfree(sbi->s_blockgroup_lock);
469 static struct kmem_cache *ext3_inode_cachep;
472 * Called inside transaction, so use GFP_NOFS
474 static struct inode *ext3_alloc_inode(struct super_block *sb)
476 struct ext3_inode_info *ei;
478 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
481 ei->i_block_alloc_info = NULL;
482 ei->vfs_inode.i_version = 1;
483 atomic_set(&ei->i_datasync_tid, 0);
484 atomic_set(&ei->i_sync_tid, 0);
485 return &ei->vfs_inode;
488 static void ext3_destroy_inode(struct inode *inode)
490 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
491 printk("EXT3 Inode %p: orphan list check failed!\n",
493 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
494 EXT3_I(inode), sizeof(struct ext3_inode_info),
498 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
501 static void init_once(void *foo)
503 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
505 INIT_LIST_HEAD(&ei->i_orphan);
506 #ifdef CONFIG_EXT3_FS_XATTR
507 init_rwsem(&ei->xattr_sem);
509 mutex_init(&ei->truncate_mutex);
510 inode_init_once(&ei->vfs_inode);
513 static int init_inodecache(void)
515 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
516 sizeof(struct ext3_inode_info),
517 0, (SLAB_RECLAIM_ACCOUNT|
520 if (ext3_inode_cachep == NULL)
525 static void destroy_inodecache(void)
527 kmem_cache_destroy(ext3_inode_cachep);
530 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
532 #if defined(CONFIG_QUOTA)
533 struct ext3_sb_info *sbi = EXT3_SB(sb);
535 if (sbi->s_jquota_fmt) {
538 switch (sbi->s_jquota_fmt) {
549 seq_printf(seq, ",jqfmt=%s", fmtname);
552 if (sbi->s_qf_names[USRQUOTA])
553 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
555 if (sbi->s_qf_names[GRPQUOTA])
556 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
558 if (test_opt(sb, USRQUOTA))
559 seq_puts(seq, ",usrquota");
561 if (test_opt(sb, GRPQUOTA))
562 seq_puts(seq, ",grpquota");
566 static char *data_mode_string(unsigned long mode)
569 case EXT3_MOUNT_JOURNAL_DATA:
571 case EXT3_MOUNT_ORDERED_DATA:
573 case EXT3_MOUNT_WRITEBACK_DATA:
581 * - it's set to a non-default value OR
582 * - if the per-sb default is different from the global default
584 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
586 struct super_block *sb = vfs->mnt_sb;
587 struct ext3_sb_info *sbi = EXT3_SB(sb);
588 struct ext3_super_block *es = sbi->s_es;
589 unsigned long def_mount_opts;
591 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
593 if (sbi->s_sb_block != 1)
594 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
595 if (test_opt(sb, MINIX_DF))
596 seq_puts(seq, ",minixdf");
597 if (test_opt(sb, GRPID))
598 seq_puts(seq, ",grpid");
599 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
600 seq_puts(seq, ",nogrpid");
601 if (sbi->s_resuid != EXT3_DEF_RESUID ||
602 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
603 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
605 if (sbi->s_resgid != EXT3_DEF_RESGID ||
606 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
607 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
609 if (test_opt(sb, ERRORS_RO)) {
610 int def_errors = le16_to_cpu(es->s_errors);
612 if (def_errors == EXT3_ERRORS_PANIC ||
613 def_errors == EXT3_ERRORS_CONTINUE) {
614 seq_puts(seq, ",errors=remount-ro");
617 if (test_opt(sb, ERRORS_CONT))
618 seq_puts(seq, ",errors=continue");
619 if (test_opt(sb, ERRORS_PANIC))
620 seq_puts(seq, ",errors=panic");
621 if (test_opt(sb, NO_UID32))
622 seq_puts(seq, ",nouid32");
623 if (test_opt(sb, DEBUG))
624 seq_puts(seq, ",debug");
625 if (test_opt(sb, OLDALLOC))
626 seq_puts(seq, ",oldalloc");
627 #ifdef CONFIG_EXT3_FS_XATTR
628 if (test_opt(sb, XATTR_USER))
629 seq_puts(seq, ",user_xattr");
630 if (!test_opt(sb, XATTR_USER) &&
631 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
632 seq_puts(seq, ",nouser_xattr");
635 #ifdef CONFIG_EXT3_FS_POSIX_ACL
636 if (test_opt(sb, POSIX_ACL))
637 seq_puts(seq, ",acl");
638 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
639 seq_puts(seq, ",noacl");
641 if (!test_opt(sb, RESERVATION))
642 seq_puts(seq, ",noreservation");
643 if (sbi->s_commit_interval) {
644 seq_printf(seq, ",commit=%u",
645 (unsigned) (sbi->s_commit_interval / HZ));
649 * Always display barrier state so it's clear what the status is.
651 seq_puts(seq, ",barrier=");
652 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
653 seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
654 if (test_opt(sb, DATA_ERR_ABORT))
655 seq_puts(seq, ",data_err=abort");
657 if (test_opt(sb, NOLOAD))
658 seq_puts(seq, ",norecovery");
660 ext3_show_quota_options(seq, sb);
666 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
667 u64 ino, u32 generation)
671 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
672 return ERR_PTR(-ESTALE);
673 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
674 return ERR_PTR(-ESTALE);
676 /* iget isn't really right if the inode is currently unallocated!!
678 * ext3_read_inode will return a bad_inode if the inode had been
679 * deleted, so we should be safe.
681 * Currently we don't know the generation for parent directory, so
682 * a generation of 0 means "accept any"
684 inode = ext3_iget(sb, ino);
686 return ERR_CAST(inode);
687 if (generation && inode->i_generation != generation) {
689 return ERR_PTR(-ESTALE);
695 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
696 int fh_len, int fh_type)
698 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
702 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
703 int fh_len, int fh_type)
705 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
710 * Try to release metadata pages (indirect blocks, directories) which are
711 * mapped via the block device. Since these pages could have journal heads
712 * which would prevent try_to_free_buffers() from freeing them, we must use
713 * jbd layer's try_to_free_buffers() function to release them.
715 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
718 journal_t *journal = EXT3_SB(sb)->s_journal;
720 WARN_ON(PageChecked(page));
721 if (!page_has_buffers(page))
724 return journal_try_to_free_buffers(journal, page,
726 return try_to_free_buffers(page);
730 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
731 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
733 static int ext3_write_dquot(struct dquot *dquot);
734 static int ext3_acquire_dquot(struct dquot *dquot);
735 static int ext3_release_dquot(struct dquot *dquot);
736 static int ext3_mark_dquot_dirty(struct dquot *dquot);
737 static int ext3_write_info(struct super_block *sb, int type);
738 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
740 static int ext3_quota_on_mount(struct super_block *sb, int type);
741 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
742 size_t len, loff_t off);
743 static ssize_t ext3_quota_write(struct super_block *sb, int type,
744 const char *data, size_t len, loff_t off);
746 static const struct dquot_operations ext3_quota_operations = {
747 .write_dquot = ext3_write_dquot,
748 .acquire_dquot = ext3_acquire_dquot,
749 .release_dquot = ext3_release_dquot,
750 .mark_dirty = ext3_mark_dquot_dirty,
751 .write_info = ext3_write_info,
752 .alloc_dquot = dquot_alloc,
753 .destroy_dquot = dquot_destroy,
756 static const struct quotactl_ops ext3_qctl_operations = {
757 .quota_on = ext3_quota_on,
758 .quota_off = dquot_quota_off,
759 .quota_sync = dquot_quota_sync,
760 .get_info = dquot_get_dqinfo,
761 .set_info = dquot_set_dqinfo,
762 .get_dqblk = dquot_get_dqblk,
763 .set_dqblk = dquot_set_dqblk
767 static const struct super_operations ext3_sops = {
768 .alloc_inode = ext3_alloc_inode,
769 .destroy_inode = ext3_destroy_inode,
770 .write_inode = ext3_write_inode,
771 .dirty_inode = ext3_dirty_inode,
772 .evict_inode = ext3_evict_inode,
773 .put_super = ext3_put_super,
774 .sync_fs = ext3_sync_fs,
775 .freeze_fs = ext3_freeze,
776 .unfreeze_fs = ext3_unfreeze,
777 .statfs = ext3_statfs,
778 .remount_fs = ext3_remount,
779 .show_options = ext3_show_options,
781 .quota_read = ext3_quota_read,
782 .quota_write = ext3_quota_write,
784 .bdev_try_to_free_page = bdev_try_to_free_page,
787 static const struct export_operations ext3_export_ops = {
788 .fh_to_dentry = ext3_fh_to_dentry,
789 .fh_to_parent = ext3_fh_to_parent,
790 .get_parent = ext3_get_parent,
794 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
795 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
796 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
797 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
798 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
799 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
800 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
801 Opt_data_err_abort, Opt_data_err_ignore,
802 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
803 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
804 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
805 Opt_resize, Opt_usrquota, Opt_grpquota
808 static const match_table_t tokens = {
809 {Opt_bsd_df, "bsddf"},
810 {Opt_minix_df, "minixdf"},
811 {Opt_grpid, "grpid"},
812 {Opt_grpid, "bsdgroups"},
813 {Opt_nogrpid, "nogrpid"},
814 {Opt_nogrpid, "sysvgroups"},
815 {Opt_resgid, "resgid=%u"},
816 {Opt_resuid, "resuid=%u"},
818 {Opt_err_cont, "errors=continue"},
819 {Opt_err_panic, "errors=panic"},
820 {Opt_err_ro, "errors=remount-ro"},
821 {Opt_nouid32, "nouid32"},
822 {Opt_nocheck, "nocheck"},
823 {Opt_nocheck, "check=none"},
824 {Opt_debug, "debug"},
825 {Opt_oldalloc, "oldalloc"},
826 {Opt_orlov, "orlov"},
827 {Opt_user_xattr, "user_xattr"},
828 {Opt_nouser_xattr, "nouser_xattr"},
830 {Opt_noacl, "noacl"},
831 {Opt_reservation, "reservation"},
832 {Opt_noreservation, "noreservation"},
833 {Opt_noload, "noload"},
834 {Opt_noload, "norecovery"},
837 {Opt_commit, "commit=%u"},
838 {Opt_journal_update, "journal=update"},
839 {Opt_journal_inum, "journal=%u"},
840 {Opt_journal_dev, "journal_dev=%u"},
841 {Opt_abort, "abort"},
842 {Opt_data_journal, "data=journal"},
843 {Opt_data_ordered, "data=ordered"},
844 {Opt_data_writeback, "data=writeback"},
845 {Opt_data_err_abort, "data_err=abort"},
846 {Opt_data_err_ignore, "data_err=ignore"},
847 {Opt_offusrjquota, "usrjquota="},
848 {Opt_usrjquota, "usrjquota=%s"},
849 {Opt_offgrpjquota, "grpjquota="},
850 {Opt_grpjquota, "grpjquota=%s"},
851 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
852 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
853 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
854 {Opt_grpquota, "grpquota"},
855 {Opt_noquota, "noquota"},
856 {Opt_quota, "quota"},
857 {Opt_usrquota, "usrquota"},
858 {Opt_barrier, "barrier=%u"},
859 {Opt_barrier, "barrier"},
860 {Opt_nobarrier, "nobarrier"},
861 {Opt_resize, "resize"},
865 static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
867 ext3_fsblk_t sb_block;
868 char *options = (char *) *data;
870 if (!options || strncmp(options, "sb=", 3) != 0)
871 return 1; /* Default location */
873 /*todo: use simple_strtoll with >32bit ext3 */
874 sb_block = simple_strtoul(options, &options, 0);
875 if (*options && *options != ',') {
876 ext3_msg(sb, "error: invalid sb specification: %s",
882 *data = (void *) options;
887 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
889 struct ext3_sb_info *sbi = EXT3_SB(sb);
892 if (sb_any_quota_loaded(sb) &&
893 !sbi->s_qf_names[qtype]) {
894 ext3_msg(sb, KERN_ERR,
895 "Cannot change journaled "
896 "quota options when quota turned on");
899 qname = match_strdup(args);
901 ext3_msg(sb, KERN_ERR,
902 "Not enough memory for storing quotafile name");
905 if (sbi->s_qf_names[qtype] &&
906 strcmp(sbi->s_qf_names[qtype], qname)) {
907 ext3_msg(sb, KERN_ERR,
908 "%s quota file already specified", QTYPE2NAME(qtype));
912 sbi->s_qf_names[qtype] = qname;
913 if (strchr(sbi->s_qf_names[qtype], '/')) {
914 ext3_msg(sb, KERN_ERR,
915 "quotafile must be on filesystem root");
916 kfree(sbi->s_qf_names[qtype]);
917 sbi->s_qf_names[qtype] = NULL;
920 set_opt(sbi->s_mount_opt, QUOTA);
924 static int clear_qf_name(struct super_block *sb, int qtype) {
926 struct ext3_sb_info *sbi = EXT3_SB(sb);
928 if (sb_any_quota_loaded(sb) &&
929 sbi->s_qf_names[qtype]) {
930 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
931 " when quota turned on");
935 * The space will be released later when all options are confirmed
938 sbi->s_qf_names[qtype] = NULL;
943 static int parse_options (char *options, struct super_block *sb,
944 unsigned int *inum, unsigned long *journal_devnum,
945 ext3_fsblk_t *n_blocks_count, int is_remount)
947 struct ext3_sb_info *sbi = EXT3_SB(sb);
949 substring_t args[MAX_OPT_ARGS];
959 while ((p = strsep (&options, ",")) != NULL) {
964 * Initialize args struct so we know whether arg was
965 * found; some options take optional arguments.
967 args[0].to = args[0].from = 0;
968 token = match_token(p, tokens, args);
971 clear_opt (sbi->s_mount_opt, MINIX_DF);
974 set_opt (sbi->s_mount_opt, MINIX_DF);
977 set_opt (sbi->s_mount_opt, GRPID);
980 clear_opt (sbi->s_mount_opt, GRPID);
983 if (match_int(&args[0], &option))
985 sbi->s_resuid = option;
988 if (match_int(&args[0], &option))
990 sbi->s_resgid = option;
993 /* handled by get_sb_block() instead of here */
994 /* *sb_block = match_int(&args[0]); */
997 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
998 clear_opt (sbi->s_mount_opt, ERRORS_RO);
999 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1002 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1003 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1004 set_opt (sbi->s_mount_opt, ERRORS_RO);
1007 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1008 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1009 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1012 set_opt (sbi->s_mount_opt, NO_UID32);
1015 clear_opt (sbi->s_mount_opt, CHECK);
1018 set_opt (sbi->s_mount_opt, DEBUG);
1021 set_opt (sbi->s_mount_opt, OLDALLOC);
1024 clear_opt (sbi->s_mount_opt, OLDALLOC);
1026 #ifdef CONFIG_EXT3_FS_XATTR
1027 case Opt_user_xattr:
1028 set_opt (sbi->s_mount_opt, XATTR_USER);
1030 case Opt_nouser_xattr:
1031 clear_opt (sbi->s_mount_opt, XATTR_USER);
1034 case Opt_user_xattr:
1035 case Opt_nouser_xattr:
1036 ext3_msg(sb, KERN_INFO,
1037 "(no)user_xattr options not supported");
1040 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1042 set_opt(sbi->s_mount_opt, POSIX_ACL);
1045 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1050 ext3_msg(sb, KERN_INFO,
1051 "(no)acl options not supported");
1054 case Opt_reservation:
1055 set_opt(sbi->s_mount_opt, RESERVATION);
1057 case Opt_noreservation:
1058 clear_opt(sbi->s_mount_opt, RESERVATION);
1060 case Opt_journal_update:
1062 /* Eventually we will want to be able to create
1063 a journal file here. For now, only allow the
1064 user to specify an existing inode to be the
1067 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1068 "journal on remount");
1071 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1073 case Opt_journal_inum:
1075 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1076 "journal on remount");
1079 if (match_int(&args[0], &option))
1083 case Opt_journal_dev:
1085 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1086 "journal on remount");
1089 if (match_int(&args[0], &option))
1091 *journal_devnum = option;
1094 set_opt (sbi->s_mount_opt, NOLOAD);
1097 if (match_int(&args[0], &option))
1102 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1103 sbi->s_commit_interval = HZ * option;
1105 case Opt_data_journal:
1106 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1108 case Opt_data_ordered:
1109 data_opt = EXT3_MOUNT_ORDERED_DATA;
1111 case Opt_data_writeback:
1112 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1115 if (test_opt(sb, DATA_FLAGS) == data_opt)
1117 ext3_msg(sb, KERN_ERR,
1118 "error: cannot change "
1119 "data mode on remount. The filesystem "
1120 "is mounted in data=%s mode and you "
1121 "try to remount it in data=%s mode.",
1122 data_mode_string(test_opt(sb,
1124 data_mode_string(data_opt));
1127 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1128 sbi->s_mount_opt |= data_opt;
1131 case Opt_data_err_abort:
1132 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1134 case Opt_data_err_ignore:
1135 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1139 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1143 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1146 case Opt_offusrjquota:
1147 if (!clear_qf_name(sb, USRQUOTA))
1150 case Opt_offgrpjquota:
1151 if (!clear_qf_name(sb, GRPQUOTA))
1154 case Opt_jqfmt_vfsold:
1155 qfmt = QFMT_VFS_OLD;
1157 case Opt_jqfmt_vfsv0:
1160 case Opt_jqfmt_vfsv1:
1163 if (sb_any_quota_loaded(sb) &&
1164 sbi->s_jquota_fmt != qfmt) {
1165 ext3_msg(sb, KERN_ERR, "error: cannot change "
1166 "journaled quota options when "
1167 "quota turned on.");
1170 sbi->s_jquota_fmt = qfmt;
1174 set_opt(sbi->s_mount_opt, QUOTA);
1175 set_opt(sbi->s_mount_opt, USRQUOTA);
1178 set_opt(sbi->s_mount_opt, QUOTA);
1179 set_opt(sbi->s_mount_opt, GRPQUOTA);
1182 if (sb_any_quota_loaded(sb)) {
1183 ext3_msg(sb, KERN_ERR, "error: cannot change "
1184 "quota options when quota turned on.");
1187 clear_opt(sbi->s_mount_opt, QUOTA);
1188 clear_opt(sbi->s_mount_opt, USRQUOTA);
1189 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1195 ext3_msg(sb, KERN_ERR,
1196 "error: quota options not supported.");
1200 case Opt_offusrjquota:
1201 case Opt_offgrpjquota:
1202 case Opt_jqfmt_vfsold:
1203 case Opt_jqfmt_vfsv0:
1204 case Opt_jqfmt_vfsv1:
1205 ext3_msg(sb, KERN_ERR,
1206 "error: journaled quota options not "
1213 set_opt(sbi->s_mount_opt, ABORT);
1216 clear_opt(sbi->s_mount_opt, BARRIER);
1220 if (match_int(&args[0], &option))
1223 option = 1; /* No argument, default to 1 */
1225 set_opt(sbi->s_mount_opt, BARRIER);
1227 clear_opt(sbi->s_mount_opt, BARRIER);
1233 ext3_msg(sb, KERN_ERR,
1234 "error: resize option only available "
1238 if (match_int(&args[0], &option) != 0)
1240 *n_blocks_count = option;
1243 ext3_msg(sb, KERN_WARNING,
1244 "warning: ignoring deprecated nobh option");
1247 ext3_msg(sb, KERN_WARNING,
1248 "warning: ignoring deprecated bh option");
1251 ext3_msg(sb, KERN_ERR,
1252 "error: unrecognized mount option \"%s\" "
1253 "or missing value", p);
1258 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1259 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1260 clear_opt(sbi->s_mount_opt, USRQUOTA);
1261 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1262 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1264 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1265 ext3_msg(sb, KERN_ERR, "error: old and new quota "
1270 if (!sbi->s_jquota_fmt) {
1271 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1276 if (sbi->s_jquota_fmt) {
1277 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1278 "specified with no journaling "
1287 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1290 struct ext3_sb_info *sbi = EXT3_SB(sb);
1293 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1294 ext3_msg(sb, KERN_ERR,
1295 "error: revision level too high, "
1296 "forcing read-only mode");
1301 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1302 ext3_msg(sb, KERN_WARNING,
1303 "warning: mounting unchecked fs, "
1304 "running e2fsck is recommended");
1305 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1306 ext3_msg(sb, KERN_WARNING,
1307 "warning: mounting fs with errors, "
1308 "running e2fsck is recommended");
1309 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1310 le16_to_cpu(es->s_mnt_count) >=
1311 le16_to_cpu(es->s_max_mnt_count))
1312 ext3_msg(sb, KERN_WARNING,
1313 "warning: maximal mount count reached, "
1314 "running e2fsck is recommended");
1315 else if (le32_to_cpu(es->s_checkinterval) &&
1316 (le32_to_cpu(es->s_lastcheck) +
1317 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1318 ext3_msg(sb, KERN_WARNING,
1319 "warning: checktime reached, "
1320 "running e2fsck is recommended");
1322 /* @@@ We _will_ want to clear the valid bit if we find
1323 inconsistencies, to force a fsck at reboot. But for
1324 a plain journaled filesystem we can keep it set as
1325 valid forever! :) */
1326 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1328 if (!le16_to_cpu(es->s_max_mnt_count))
1329 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1330 le16_add_cpu(&es->s_mnt_count, 1);
1331 es->s_mtime = cpu_to_le32(get_seconds());
1332 ext3_update_dynamic_rev(sb);
1333 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1335 ext3_commit_super(sb, es, 1);
1336 if (test_opt(sb, DEBUG))
1337 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1338 "bpg=%lu, ipg=%lu, mo=%04lx]",
1340 sbi->s_groups_count,
1341 EXT3_BLOCKS_PER_GROUP(sb),
1342 EXT3_INODES_PER_GROUP(sb),
1345 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1346 char b[BDEVNAME_SIZE];
1347 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1348 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1350 ext3_msg(sb, KERN_INFO, "using internal journal");
1355 /* Called at mount-time, super-block is locked */
1356 static int ext3_check_descriptors(struct super_block *sb)
1358 struct ext3_sb_info *sbi = EXT3_SB(sb);
1361 ext3_debug ("Checking group descriptors");
1363 for (i = 0; i < sbi->s_groups_count; i++) {
1364 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1365 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1366 ext3_fsblk_t last_block;
1368 if (i == sbi->s_groups_count - 1)
1369 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1371 last_block = first_block +
1372 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1374 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1375 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1377 ext3_error (sb, "ext3_check_descriptors",
1378 "Block bitmap for group %d"
1379 " not in group (block %lu)!",
1381 le32_to_cpu(gdp->bg_block_bitmap));
1384 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1385 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1387 ext3_error (sb, "ext3_check_descriptors",
1388 "Inode bitmap for group %d"
1389 " not in group (block %lu)!",
1391 le32_to_cpu(gdp->bg_inode_bitmap));
1394 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1395 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1398 ext3_error (sb, "ext3_check_descriptors",
1399 "Inode table for group %d"
1400 " not in group (block %lu)!",
1402 le32_to_cpu(gdp->bg_inode_table));
1407 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1408 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1413 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1414 * the superblock) which were deleted from all directories, but held open by
1415 * a process at the time of a crash. We walk the list and try to delete these
1416 * inodes at recovery time (only with a read-write filesystem).
1418 * In order to keep the orphan inode chain consistent during traversal (in
1419 * case of crash during recovery), we link each inode into the superblock
1420 * orphan list_head and handle it the same way as an inode deletion during
1421 * normal operation (which journals the operations for us).
1423 * We only do an iget() and an iput() on each inode, which is very safe if we
1424 * accidentally point at an in-use or already deleted inode. The worst that
1425 * can happen in this case is that we get a "bit already cleared" message from
1426 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1427 * e2fsck was run on this filesystem, and it must have already done the orphan
1428 * inode cleanup for us, so we can safely abort without any further action.
1430 static void ext3_orphan_cleanup (struct super_block * sb,
1431 struct ext3_super_block * es)
1433 unsigned int s_flags = sb->s_flags;
1434 int nr_orphans = 0, nr_truncates = 0;
1438 if (!es->s_last_orphan) {
1439 jbd_debug(4, "no orphan inodes to clean up\n");
1443 if (bdev_read_only(sb->s_bdev)) {
1444 ext3_msg(sb, KERN_ERR, "error: write access "
1445 "unavailable, skipping orphan cleanup.");
1449 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1450 if (es->s_last_orphan)
1451 jbd_debug(1, "Errors on filesystem, "
1452 "clearing orphan list.\n");
1453 es->s_last_orphan = 0;
1454 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1458 if (s_flags & MS_RDONLY) {
1459 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1460 sb->s_flags &= ~MS_RDONLY;
1463 /* Needed for iput() to work correctly and not trash data */
1464 sb->s_flags |= MS_ACTIVE;
1465 /* Turn on quotas so that they are updated correctly */
1466 for (i = 0; i < MAXQUOTAS; i++) {
1467 if (EXT3_SB(sb)->s_qf_names[i]) {
1468 int ret = ext3_quota_on_mount(sb, i);
1470 ext3_msg(sb, KERN_ERR,
1471 "error: cannot turn on journaled "
1477 while (es->s_last_orphan) {
1478 struct inode *inode;
1480 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1481 if (IS_ERR(inode)) {
1482 es->s_last_orphan = 0;
1486 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1487 dquot_initialize(inode);
1488 if (inode->i_nlink) {
1490 "%s: truncating inode %lu to %Ld bytes\n",
1491 __func__, inode->i_ino, inode->i_size);
1492 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1493 inode->i_ino, inode->i_size);
1494 ext3_truncate(inode);
1498 "%s: deleting unreferenced inode %lu\n",
1499 __func__, inode->i_ino);
1500 jbd_debug(2, "deleting unreferenced inode %lu\n",
1504 iput(inode); /* The delete magic happens here! */
1507 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1510 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1511 PLURAL(nr_orphans));
1513 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1514 PLURAL(nr_truncates));
1516 /* Turn quotas off */
1517 for (i = 0; i < MAXQUOTAS; i++) {
1518 if (sb_dqopt(sb)->files[i])
1519 dquot_quota_off(sb, i);
1522 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1526 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1527 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1528 * We need to be 1 filesystem block less than the 2^32 sector limit.
1530 static loff_t ext3_max_size(int bits)
1532 loff_t res = EXT3_NDIR_BLOCKS;
1536 /* This is calculated to be the largest file size for a
1537 * dense, file such that the total number of
1538 * sectors in the file, including data and all indirect blocks,
1539 * does not exceed 2^32 -1
1540 * __u32 i_blocks representing the total number of
1541 * 512 bytes blocks of the file
1543 upper_limit = (1LL << 32) - 1;
1545 /* total blocks in file system block size */
1546 upper_limit >>= (bits - 9);
1549 /* indirect blocks */
1551 /* double indirect blocks */
1552 meta_blocks += 1 + (1LL << (bits-2));
1553 /* tripple indirect blocks */
1554 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1556 upper_limit -= meta_blocks;
1557 upper_limit <<= bits;
1559 res += 1LL << (bits-2);
1560 res += 1LL << (2*(bits-2));
1561 res += 1LL << (3*(bits-2));
1563 if (res > upper_limit)
1566 if (res > MAX_LFS_FILESIZE)
1567 res = MAX_LFS_FILESIZE;
1572 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1573 ext3_fsblk_t logic_sb_block,
1576 struct ext3_sb_info *sbi = EXT3_SB(sb);
1577 unsigned long bg, first_meta_bg;
1580 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1582 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1584 return (logic_sb_block + nr + 1);
1585 bg = sbi->s_desc_per_block * nr;
1586 if (ext3_bg_has_super(sb, bg))
1588 return (has_super + ext3_group_first_block_no(sb, bg));
1592 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1594 struct buffer_head * bh;
1595 struct ext3_super_block *es = NULL;
1596 struct ext3_sb_info *sbi;
1598 ext3_fsblk_t sb_block = get_sb_block(&data, sb);
1599 ext3_fsblk_t logic_sb_block;
1600 unsigned long offset = 0;
1601 unsigned int journal_inum = 0;
1602 unsigned long journal_devnum = 0;
1603 unsigned long def_mount_opts;
1614 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1618 sbi->s_blockgroup_lock =
1619 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1620 if (!sbi->s_blockgroup_lock) {
1624 sb->s_fs_info = sbi;
1625 sbi->s_mount_opt = 0;
1626 sbi->s_resuid = EXT3_DEF_RESUID;
1627 sbi->s_resgid = EXT3_DEF_RESGID;
1628 sbi->s_sb_block = sb_block;
1632 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1634 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1639 * The ext3 superblock will not be buffer aligned for other than 1kB
1640 * block sizes. We need to calculate the offset from buffer start.
1642 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1643 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1644 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1646 logic_sb_block = sb_block;
1649 if (!(bh = sb_bread(sb, logic_sb_block))) {
1650 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1654 * Note: s_es must be initialized as soon as possible because
1655 * some ext3 macro-instructions depend on its value
1657 es = (struct ext3_super_block *) (bh->b_data + offset);
1659 sb->s_magic = le16_to_cpu(es->s_magic);
1660 if (sb->s_magic != EXT3_SUPER_MAGIC)
1663 /* Set defaults before we parse the mount options */
1664 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1665 if (def_mount_opts & EXT3_DEFM_DEBUG)
1666 set_opt(sbi->s_mount_opt, DEBUG);
1667 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1668 set_opt(sbi->s_mount_opt, GRPID);
1669 if (def_mount_opts & EXT3_DEFM_UID16)
1670 set_opt(sbi->s_mount_opt, NO_UID32);
1671 #ifdef CONFIG_EXT3_FS_XATTR
1672 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1673 set_opt(sbi->s_mount_opt, XATTR_USER);
1675 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1676 if (def_mount_opts & EXT3_DEFM_ACL)
1677 set_opt(sbi->s_mount_opt, POSIX_ACL);
1679 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1680 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1681 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1682 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1683 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1684 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1686 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1687 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1688 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1689 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1691 set_opt(sbi->s_mount_opt, ERRORS_RO);
1693 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1694 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1696 set_opt(sbi->s_mount_opt, RESERVATION);
1698 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1702 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1703 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1705 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1706 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1707 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1708 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1709 ext3_msg(sb, KERN_WARNING,
1710 "warning: feature flags set on rev 0 fs, "
1711 "running e2fsck is recommended");
1713 * Check feature flags regardless of the revision level, since we
1714 * previously didn't change the revision level when setting the flags,
1715 * so there is a chance incompat flags are set on a rev 0 filesystem.
1717 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1719 ext3_msg(sb, KERN_ERR,
1720 "error: couldn't mount because of unsupported "
1721 "optional features (%x)", le32_to_cpu(features));
1724 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1725 if (!(sb->s_flags & MS_RDONLY) && features) {
1726 ext3_msg(sb, KERN_ERR,
1727 "error: couldn't mount RDWR because of unsupported "
1728 "optional features (%x)", le32_to_cpu(features));
1731 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1733 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1734 blocksize > EXT3_MAX_BLOCK_SIZE) {
1735 ext3_msg(sb, KERN_ERR,
1736 "error: couldn't mount because of unsupported "
1737 "filesystem blocksize %d", blocksize);
1741 hblock = bdev_logical_block_size(sb->s_bdev);
1742 if (sb->s_blocksize != blocksize) {
1744 * Make sure the blocksize for the filesystem is larger
1745 * than the hardware sectorsize for the machine.
1747 if (blocksize < hblock) {
1748 ext3_msg(sb, KERN_ERR,
1749 "error: fsblocksize %d too small for "
1750 "hardware sectorsize %d", blocksize, hblock);
1755 if (!sb_set_blocksize(sb, blocksize)) {
1756 ext3_msg(sb, KERN_ERR,
1757 "error: bad blocksize %d", blocksize);
1760 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1761 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1762 bh = sb_bread(sb, logic_sb_block);
1764 ext3_msg(sb, KERN_ERR,
1765 "error: can't read superblock on 2nd try");
1768 es = (struct ext3_super_block *)(bh->b_data + offset);
1770 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1771 ext3_msg(sb, KERN_ERR,
1772 "error: magic mismatch");
1777 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1779 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1780 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1781 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1783 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1784 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1785 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1786 (!is_power_of_2(sbi->s_inode_size)) ||
1787 (sbi->s_inode_size > blocksize)) {
1788 ext3_msg(sb, KERN_ERR,
1789 "error: unsupported inode size: %d",
1794 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1795 le32_to_cpu(es->s_log_frag_size);
1796 if (blocksize != sbi->s_frag_size) {
1797 ext3_msg(sb, KERN_ERR,
1798 "error: fragsize %lu != blocksize %u (unsupported)",
1799 sbi->s_frag_size, blocksize);
1802 sbi->s_frags_per_block = 1;
1803 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1804 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1805 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1806 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1808 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1809 if (sbi->s_inodes_per_block == 0)
1811 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1812 sbi->s_inodes_per_block;
1813 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1815 sbi->s_mount_state = le16_to_cpu(es->s_state);
1816 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1817 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1818 for (i=0; i < 4; i++)
1819 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1820 sbi->s_def_hash_version = es->s_def_hash_version;
1821 i = le32_to_cpu(es->s_flags);
1822 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1823 sbi->s_hash_unsigned = 3;
1824 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1825 #ifdef __CHAR_UNSIGNED__
1826 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1827 sbi->s_hash_unsigned = 3;
1829 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1833 if (sbi->s_blocks_per_group > blocksize * 8) {
1834 ext3_msg(sb, KERN_ERR,
1835 "#blocks per group too big: %lu",
1836 sbi->s_blocks_per_group);
1839 if (sbi->s_frags_per_group > blocksize * 8) {
1840 ext3_msg(sb, KERN_ERR,
1841 "error: #fragments per group too big: %lu",
1842 sbi->s_frags_per_group);
1845 if (sbi->s_inodes_per_group > blocksize * 8) {
1846 ext3_msg(sb, KERN_ERR,
1847 "error: #inodes per group too big: %lu",
1848 sbi->s_inodes_per_group);
1852 if (le32_to_cpu(es->s_blocks_count) >
1853 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1854 ext3_msg(sb, KERN_ERR,
1855 "error: filesystem is too large to mount safely");
1856 if (sizeof(sector_t) < 8)
1857 ext3_msg(sb, KERN_ERR,
1858 "error: CONFIG_LBDAF not enabled");
1862 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1864 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1865 le32_to_cpu(es->s_first_data_block) - 1)
1866 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1867 db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
1868 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1870 if (sbi->s_group_desc == NULL) {
1871 ext3_msg(sb, KERN_ERR,
1872 "error: not enough memory");
1877 bgl_lock_init(sbi->s_blockgroup_lock);
1879 for (i = 0; i < db_count; i++) {
1880 block = descriptor_loc(sb, logic_sb_block, i);
1881 sbi->s_group_desc[i] = sb_bread(sb, block);
1882 if (!sbi->s_group_desc[i]) {
1883 ext3_msg(sb, KERN_ERR,
1884 "error: can't read group descriptor %d", i);
1889 if (!ext3_check_descriptors (sb)) {
1890 ext3_msg(sb, KERN_ERR,
1891 "error: group descriptors corrupted");
1894 sbi->s_gdb_count = db_count;
1895 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1896 spin_lock_init(&sbi->s_next_gen_lock);
1898 /* per fileystem reservation list head & lock */
1899 spin_lock_init(&sbi->s_rsv_window_lock);
1900 sbi->s_rsv_window_root = RB_ROOT;
1901 /* Add a single, static dummy reservation to the start of the
1902 * reservation window list --- it gives us a placeholder for
1903 * append-at-start-of-list which makes the allocation logic
1904 * _much_ simpler. */
1905 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1906 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1907 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1908 sbi->s_rsv_window_head.rsv_goal_size = 0;
1909 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1912 * set up enough so that it can read an inode
1914 sb->s_op = &ext3_sops;
1915 sb->s_export_op = &ext3_export_ops;
1916 sb->s_xattr = ext3_xattr_handlers;
1918 sb->s_qcop = &ext3_qctl_operations;
1919 sb->dq_op = &ext3_quota_operations;
1921 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1922 mutex_init(&sbi->s_orphan_lock);
1923 mutex_init(&sbi->s_resize_lock);
1927 needs_recovery = (es->s_last_orphan != 0 ||
1928 EXT3_HAS_INCOMPAT_FEATURE(sb,
1929 EXT3_FEATURE_INCOMPAT_RECOVER));
1932 * The first inode we look at is the journal inode. Don't try
1933 * root first: it may be modified in the journal!
1935 if (!test_opt(sb, NOLOAD) &&
1936 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1937 if (ext3_load_journal(sb, es, journal_devnum))
1939 } else if (journal_inum) {
1940 if (ext3_create_journal(sb, es, journal_inum))
1944 ext3_msg(sb, KERN_ERR,
1945 "error: no journal found. "
1946 "mounting ext3 over ext2?");
1949 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1950 ext3_count_free_blocks(sb));
1952 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1953 ext3_count_free_inodes(sb));
1956 err = percpu_counter_init(&sbi->s_dirs_counter,
1957 ext3_count_dirs(sb));
1960 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
1965 /* We have now updated the journal if required, so we can
1966 * validate the data journaling mode. */
1967 switch (test_opt(sb, DATA_FLAGS)) {
1969 /* No mode set, assume a default based on the journal
1970 capabilities: ORDERED_DATA if the journal can
1971 cope, else JOURNAL_DATA */
1972 if (journal_check_available_features
1973 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1974 set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
1976 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1979 case EXT3_MOUNT_ORDERED_DATA:
1980 case EXT3_MOUNT_WRITEBACK_DATA:
1981 if (!journal_check_available_features
1982 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1983 ext3_msg(sb, KERN_ERR,
1984 "error: journal does not support "
1985 "requested data journaling mode");
1993 * The journal_load will have done any necessary log recovery,
1994 * so we can safely mount the rest of the filesystem now.
1997 root = ext3_iget(sb, EXT3_ROOT_INO);
1999 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
2000 ret = PTR_ERR(root);
2003 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2005 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
2008 sb->s_root = d_alloc_root(root);
2010 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
2016 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
2018 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2019 ext3_orphan_cleanup(sb, es);
2020 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2022 ext3_msg(sb, KERN_INFO, "recovery complete");
2023 ext3_mark_recovery_complete(sb, es);
2024 ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
2025 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2026 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2034 ext3_msg(sb, KERN_INFO,
2035 "error: can't find ext3 filesystem on dev %s.",
2040 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2041 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2042 percpu_counter_destroy(&sbi->s_dirs_counter);
2043 journal_destroy(sbi->s_journal);
2045 for (i = 0; i < db_count; i++)
2046 brelse(sbi->s_group_desc[i]);
2047 kfree(sbi->s_group_desc);
2050 for (i = 0; i < MAXQUOTAS; i++)
2051 kfree(sbi->s_qf_names[i]);
2053 ext3_blkdev_remove(sbi);
2056 sb->s_fs_info = NULL;
2057 kfree(sbi->s_blockgroup_lock);
2064 * Setup any per-fs journal parameters now. We'll do this both on
2065 * initial mount, once the journal has been initialised but before we've
2066 * done any recovery; and again on any subsequent remount.
2068 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2070 struct ext3_sb_info *sbi = EXT3_SB(sb);
2072 if (sbi->s_commit_interval)
2073 journal->j_commit_interval = sbi->s_commit_interval;
2074 /* We could also set up an ext3-specific default for the commit
2075 * interval here, but for now we'll just fall back to the jbd
2078 spin_lock(&journal->j_state_lock);
2079 if (test_opt(sb, BARRIER))
2080 journal->j_flags |= JFS_BARRIER;
2082 journal->j_flags &= ~JFS_BARRIER;
2083 if (test_opt(sb, DATA_ERR_ABORT))
2084 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2086 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2087 spin_unlock(&journal->j_state_lock);
2090 static journal_t *ext3_get_journal(struct super_block *sb,
2091 unsigned int journal_inum)
2093 struct inode *journal_inode;
2096 /* First, test for the existence of a valid inode on disk. Bad
2097 * things happen if we iget() an unused inode, as the subsequent
2098 * iput() will try to delete it. */
2100 journal_inode = ext3_iget(sb, journal_inum);
2101 if (IS_ERR(journal_inode)) {
2102 ext3_msg(sb, KERN_ERR, "error: no journal found");
2105 if (!journal_inode->i_nlink) {
2106 make_bad_inode(journal_inode);
2107 iput(journal_inode);
2108 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
2112 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2113 journal_inode, journal_inode->i_size);
2114 if (!S_ISREG(journal_inode->i_mode)) {
2115 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
2116 iput(journal_inode);
2120 journal = journal_init_inode(journal_inode);
2122 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
2123 iput(journal_inode);
2126 journal->j_private = sb;
2127 ext3_init_journal_params(sb, journal);
2131 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2134 struct buffer_head * bh;
2138 int hblock, blocksize;
2139 ext3_fsblk_t sb_block;
2140 unsigned long offset;
2141 struct ext3_super_block * es;
2142 struct block_device *bdev;
2144 bdev = ext3_blkdev_get(j_dev, sb);
2148 if (bd_claim(bdev, sb)) {
2149 ext3_msg(sb, KERN_ERR,
2150 "error: failed to claim external journal device");
2151 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
2155 blocksize = sb->s_blocksize;
2156 hblock = bdev_logical_block_size(bdev);
2157 if (blocksize < hblock) {
2158 ext3_msg(sb, KERN_ERR,
2159 "error: blocksize too small for journal device");
2163 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2164 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2165 set_blocksize(bdev, blocksize);
2166 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2167 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2168 "external journal");
2172 es = (struct ext3_super_block *) (bh->b_data + offset);
2173 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2174 !(le32_to_cpu(es->s_feature_incompat) &
2175 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2176 ext3_msg(sb, KERN_ERR, "error: external journal has "
2182 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2183 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
2188 len = le32_to_cpu(es->s_blocks_count);
2189 start = sb_block + 1;
2190 brelse(bh); /* we're done with the superblock */
2192 journal = journal_init_dev(bdev, sb->s_bdev,
2193 start, len, blocksize);
2195 ext3_msg(sb, KERN_ERR,
2196 "error: failed to create device journal");
2199 journal->j_private = sb;
2200 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2201 wait_on_buffer(journal->j_sb_buffer);
2202 if (!buffer_uptodate(journal->j_sb_buffer)) {
2203 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2206 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2207 ext3_msg(sb, KERN_ERR,
2208 "error: external journal has more than one "
2209 "user (unsupported) - %d",
2210 be32_to_cpu(journal->j_superblock->s_nr_users));
2213 EXT3_SB(sb)->journal_bdev = bdev;
2214 ext3_init_journal_params(sb, journal);
2217 journal_destroy(journal);
2219 ext3_blkdev_put(bdev);
2223 static int ext3_load_journal(struct super_block *sb,
2224 struct ext3_super_block *es,
2225 unsigned long journal_devnum)
2228 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2231 int really_read_only;
2233 if (journal_devnum &&
2234 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2235 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2236 "numbers have changed");
2237 journal_dev = new_decode_dev(journal_devnum);
2239 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2241 really_read_only = bdev_read_only(sb->s_bdev);
2244 * Are we loading a blank journal or performing recovery after a
2245 * crash? For recovery, we need to check in advance whether we
2246 * can get read-write access to the device.
2249 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2250 if (sb->s_flags & MS_RDONLY) {
2251 ext3_msg(sb, KERN_INFO,
2252 "recovery required on readonly filesystem");
2253 if (really_read_only) {
2254 ext3_msg(sb, KERN_ERR, "error: write access "
2255 "unavailable, cannot proceed");
2258 ext3_msg(sb, KERN_INFO,
2259 "write access will be enabled during recovery");
2263 if (journal_inum && journal_dev) {
2264 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2265 "and inode journals");
2270 if (!(journal = ext3_get_journal(sb, journal_inum)))
2273 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2277 if (!(journal->j_flags & JFS_BARRIER))
2278 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2280 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2281 err = journal_update_format(journal);
2283 ext3_msg(sb, KERN_ERR, "error updating journal");
2284 journal_destroy(journal);
2289 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2290 err = journal_wipe(journal, !really_read_only);
2292 err = journal_load(journal);
2295 ext3_msg(sb, KERN_ERR, "error loading journal");
2296 journal_destroy(journal);
2300 EXT3_SB(sb)->s_journal = journal;
2301 ext3_clear_journal_err(sb, es);
2303 if (journal_devnum &&
2304 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2305 es->s_journal_dev = cpu_to_le32(journal_devnum);
2307 /* Make sure we flush the recovery flag to disk. */
2308 ext3_commit_super(sb, es, 1);
2314 static int ext3_create_journal(struct super_block *sb,
2315 struct ext3_super_block *es,
2316 unsigned int journal_inum)
2321 if (sb->s_flags & MS_RDONLY) {
2322 ext3_msg(sb, KERN_ERR,
2323 "error: readonly filesystem when trying to "
2328 journal = ext3_get_journal(sb, journal_inum);
2332 ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
2335 err = journal_create(journal);
2337 ext3_msg(sb, KERN_ERR, "error creating journal");
2338 journal_destroy(journal);
2342 EXT3_SB(sb)->s_journal = journal;
2344 ext3_update_dynamic_rev(sb);
2345 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2346 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2348 es->s_journal_inum = cpu_to_le32(journal_inum);
2350 /* Make sure we flush the recovery flag to disk. */
2351 ext3_commit_super(sb, es, 1);
2356 static int ext3_commit_super(struct super_block *sb,
2357 struct ext3_super_block *es,
2360 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2366 if (buffer_write_io_error(sbh)) {
2368 * Oh, dear. A previous attempt to write the
2369 * superblock failed. This could happen because the
2370 * USB device was yanked out. Or it could happen to
2371 * be a transient write error and maybe the block will
2372 * be remapped. Nothing we can do but to retry the
2373 * write and hope for the best.
2375 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2376 "superblock detected");
2377 clear_buffer_write_io_error(sbh);
2378 set_buffer_uptodate(sbh);
2381 * If the file system is mounted read-only, don't update the
2382 * superblock write time. This avoids updating the superblock
2383 * write time when we are mounting the root file system
2384 * read/only but we need to replay the journal; at that point,
2385 * for people who are east of GMT and who make their clock
2386 * tick in localtime for Windows bug-for-bug compatibility,
2387 * the clock is set in the future, and this will cause e2fsck
2388 * to complain and force a full file system check.
2390 if (!(sb->s_flags & MS_RDONLY))
2391 es->s_wtime = cpu_to_le32(get_seconds());
2392 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2393 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2394 BUFFER_TRACE(sbh, "marking dirty");
2395 mark_buffer_dirty(sbh);
2397 error = sync_dirty_buffer(sbh);
2398 if (buffer_write_io_error(sbh)) {
2399 ext3_msg(sb, KERN_ERR, "I/O error while writing "
2401 clear_buffer_write_io_error(sbh);
2402 set_buffer_uptodate(sbh);
2410 * Have we just finished recovery? If so, and if we are mounting (or
2411 * remounting) the filesystem readonly, then we will end up with a
2412 * consistent fs on disk. Record that fact.
2414 static void ext3_mark_recovery_complete(struct super_block * sb,
2415 struct ext3_super_block * es)
2417 journal_t *journal = EXT3_SB(sb)->s_journal;
2419 journal_lock_updates(journal);
2420 if (journal_flush(journal) < 0)
2423 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2424 sb->s_flags & MS_RDONLY) {
2425 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2426 ext3_commit_super(sb, es, 1);
2430 journal_unlock_updates(journal);
2434 * If we are mounting (or read-write remounting) a filesystem whose journal
2435 * has recorded an error from a previous lifetime, move that error to the
2436 * main filesystem now.
2438 static void ext3_clear_journal_err(struct super_block *sb,
2439 struct ext3_super_block *es)
2445 journal = EXT3_SB(sb)->s_journal;
2448 * Now check for any error status which may have been recorded in the
2449 * journal by a prior ext3_error() or ext3_abort()
2452 j_errno = journal_errno(journal);
2456 errstr = ext3_decode_error(sb, j_errno, nbuf);
2457 ext3_warning(sb, __func__, "Filesystem error recorded "
2458 "from previous mount: %s", errstr);
2459 ext3_warning(sb, __func__, "Marking fs in need of "
2460 "filesystem check.");
2462 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2463 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2464 ext3_commit_super (sb, es, 1);
2466 journal_clear_err(journal);
2471 * Force the running and committing transactions to commit,
2472 * and wait on the commit.
2474 int ext3_force_commit(struct super_block *sb)
2479 if (sb->s_flags & MS_RDONLY)
2482 journal = EXT3_SB(sb)->s_journal;
2483 ret = ext3_journal_force_commit(journal);
2487 static int ext3_sync_fs(struct super_block *sb, int wait)
2491 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2493 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2499 * LVM calls this function before a (read-only) snapshot is created. This
2500 * gives us a chance to flush the journal completely and mark the fs clean.
2502 static int ext3_freeze(struct super_block *sb)
2507 if (!(sb->s_flags & MS_RDONLY)) {
2508 journal = EXT3_SB(sb)->s_journal;
2510 /* Now we set up the journal barrier. */
2511 journal_lock_updates(journal);
2514 * We don't want to clear needs_recovery flag when we failed
2515 * to flush the journal.
2517 error = journal_flush(journal);
2521 /* Journal blocked and flushed, clear needs_recovery flag. */
2522 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2523 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2530 journal_unlock_updates(journal);
2535 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2536 * flag here, even though the filesystem is not technically dirty yet.
2538 static int ext3_unfreeze(struct super_block *sb)
2540 if (!(sb->s_flags & MS_RDONLY)) {
2542 /* Reser the needs_recovery flag before the fs is unlocked. */
2543 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2544 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2546 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2551 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2553 struct ext3_super_block * es;
2554 struct ext3_sb_info *sbi = EXT3_SB(sb);
2555 ext3_fsblk_t n_blocks_count = 0;
2556 unsigned long old_sb_flags;
2557 struct ext3_mount_options old_opts;
2558 int enable_quota = 0;
2566 /* Store the original options */
2568 old_sb_flags = sb->s_flags;
2569 old_opts.s_mount_opt = sbi->s_mount_opt;
2570 old_opts.s_resuid = sbi->s_resuid;
2571 old_opts.s_resgid = sbi->s_resgid;
2572 old_opts.s_commit_interval = sbi->s_commit_interval;
2574 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2575 for (i = 0; i < MAXQUOTAS; i++)
2576 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2580 * Allow the "check" option to be passed as a remount option.
2582 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2587 if (test_opt(sb, ABORT))
2588 ext3_abort(sb, __func__, "Abort forced by user");
2590 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2591 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2595 ext3_init_journal_params(sb, sbi->s_journal);
2597 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2598 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2599 if (test_opt(sb, ABORT)) {
2604 if (*flags & MS_RDONLY) {
2605 err = dquot_suspend(sb, -1);
2610 * First of all, the unconditional stuff we have to do
2611 * to disable replay of the journal when we next remount
2613 sb->s_flags |= MS_RDONLY;
2616 * OK, test if we are remounting a valid rw partition
2617 * readonly, and if so set the rdonly flag and then
2618 * mark the partition as valid again.
2620 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2621 (sbi->s_mount_state & EXT3_VALID_FS))
2622 es->s_state = cpu_to_le16(sbi->s_mount_state);
2624 ext3_mark_recovery_complete(sb, es);
2627 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2628 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2629 ext3_msg(sb, KERN_WARNING,
2630 "warning: couldn't remount RDWR "
2631 "because of unsupported optional "
2632 "features (%x)", le32_to_cpu(ret));
2638 * If we have an unprocessed orphan list hanging
2639 * around from a previously readonly bdev mount,
2640 * require a full umount/remount for now.
2642 if (es->s_last_orphan) {
2643 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
2644 "remount RDWR because of unprocessed "
2645 "orphan inode list. Please "
2646 "umount/remount instead.");
2652 * Mounting a RDONLY partition read-write, so reread
2653 * and store the current valid flag. (It may have
2654 * been changed by e2fsck since we originally mounted
2657 ext3_clear_journal_err(sb, es);
2658 sbi->s_mount_state = le16_to_cpu(es->s_state);
2659 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2661 if (!ext3_setup_super (sb, es, 0))
2662 sb->s_flags &= ~MS_RDONLY;
2667 /* Release old quota file names */
2668 for (i = 0; i < MAXQUOTAS; i++)
2669 if (old_opts.s_qf_names[i] &&
2670 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2671 kfree(old_opts.s_qf_names[i]);
2677 dquot_resume(sb, -1);
2680 sb->s_flags = old_sb_flags;
2681 sbi->s_mount_opt = old_opts.s_mount_opt;
2682 sbi->s_resuid = old_opts.s_resuid;
2683 sbi->s_resgid = old_opts.s_resgid;
2684 sbi->s_commit_interval = old_opts.s_commit_interval;
2686 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2687 for (i = 0; i < MAXQUOTAS; i++) {
2688 if (sbi->s_qf_names[i] &&
2689 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2690 kfree(sbi->s_qf_names[i]);
2691 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2699 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2701 struct super_block *sb = dentry->d_sb;
2702 struct ext3_sb_info *sbi = EXT3_SB(sb);
2703 struct ext3_super_block *es = sbi->s_es;
2706 if (test_opt(sb, MINIX_DF)) {
2707 sbi->s_overhead_last = 0;
2708 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2709 unsigned long ngroups = sbi->s_groups_count, i;
2710 ext3_fsblk_t overhead = 0;
2714 * Compute the overhead (FS structures). This is constant
2715 * for a given filesystem unless the number of block groups
2716 * changes so we cache the previous value until it does.
2720 * All of the blocks before first_data_block are
2723 overhead = le32_to_cpu(es->s_first_data_block);
2726 * Add the overhead attributed to the superblock and
2727 * block group descriptors. If the sparse superblocks
2728 * feature is turned on, then not all groups have this.
2730 for (i = 0; i < ngroups; i++) {
2731 overhead += ext3_bg_has_super(sb, i) +
2732 ext3_bg_num_gdb(sb, i);
2737 * Every block group has an inode bitmap, a block
2738 * bitmap, and an inode table.
2740 overhead += ngroups * (2 + sbi->s_itb_per_group);
2741 sbi->s_overhead_last = overhead;
2743 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2746 buf->f_type = EXT3_SUPER_MAGIC;
2747 buf->f_bsize = sb->s_blocksize;
2748 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2749 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2750 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2751 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2753 buf->f_files = le32_to_cpu(es->s_inodes_count);
2754 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2755 buf->f_namelen = EXT3_NAME_LEN;
2756 fsid = le64_to_cpup((void *)es->s_uuid) ^
2757 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2758 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2759 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2763 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2764 * is locked for write. Otherwise the are possible deadlocks:
2765 * Process 1 Process 2
2766 * ext3_create() quota_sync()
2767 * journal_start() write_dquot()
2768 * dquot_initialize() down(dqio_mutex)
2769 * down(dqio_mutex) journal_start()
2775 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2777 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2780 static int ext3_write_dquot(struct dquot *dquot)
2784 struct inode *inode;
2786 inode = dquot_to_inode(dquot);
2787 handle = ext3_journal_start(inode,
2788 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2790 return PTR_ERR(handle);
2791 ret = dquot_commit(dquot);
2792 err = ext3_journal_stop(handle);
2798 static int ext3_acquire_dquot(struct dquot *dquot)
2803 handle = ext3_journal_start(dquot_to_inode(dquot),
2804 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2806 return PTR_ERR(handle);
2807 ret = dquot_acquire(dquot);
2808 err = ext3_journal_stop(handle);
2814 static int ext3_release_dquot(struct dquot *dquot)
2819 handle = ext3_journal_start(dquot_to_inode(dquot),
2820 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2821 if (IS_ERR(handle)) {
2822 /* Release dquot anyway to avoid endless cycle in dqput() */
2823 dquot_release(dquot);
2824 return PTR_ERR(handle);
2826 ret = dquot_release(dquot);
2827 err = ext3_journal_stop(handle);
2833 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2835 /* Are we journaling quotas? */
2836 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2837 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2838 dquot_mark_dquot_dirty(dquot);
2839 return ext3_write_dquot(dquot);
2841 return dquot_mark_dquot_dirty(dquot);
2845 static int ext3_write_info(struct super_block *sb, int type)
2850 /* Data block + inode block */
2851 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2853 return PTR_ERR(handle);
2854 ret = dquot_commit_info(sb, type);
2855 err = ext3_journal_stop(handle);
2862 * Turn on quotas during mount time - we need to find
2863 * the quota file and such...
2865 static int ext3_quota_on_mount(struct super_block *sb, int type)
2867 return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2868 EXT3_SB(sb)->s_jquota_fmt, type);
2872 * Standard function to be called on quota_on
2874 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2880 if (!test_opt(sb, QUOTA))
2883 err = kern_path(name, LOOKUP_FOLLOW, &path);
2887 /* Quotafile not on the same filesystem? */
2888 if (path.mnt->mnt_sb != sb) {
2892 /* Journaling quota? */
2893 if (EXT3_SB(sb)->s_qf_names[type]) {
2894 /* Quotafile not of fs root? */
2895 if (path.dentry->d_parent != sb->s_root)
2896 ext3_msg(sb, KERN_WARNING,
2897 "warning: Quota file not on filesystem root. "
2898 "Journaled quota will not work.");
2902 * When we journal data on quota file, we have to flush journal to see
2903 * all updates to the file when we bypass pagecache...
2905 if (ext3_should_journal_data(path.dentry->d_inode)) {
2907 * We don't need to lock updates but journal_flush() could
2908 * otherwise be livelocked...
2910 journal_lock_updates(EXT3_SB(sb)->s_journal);
2911 err = journal_flush(EXT3_SB(sb)->s_journal);
2912 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2919 err = dquot_quota_on_path(sb, type, format_id, &path);
2924 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2925 * acquiring the locks... As quota files are never truncated and quota code
2926 * itself serializes the operations (and noone else should touch the files)
2927 * we don't have to be afraid of races */
2928 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2929 size_t len, loff_t off)
2931 struct inode *inode = sb_dqopt(sb)->files[type];
2932 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2934 int offset = off & (sb->s_blocksize - 1);
2937 struct buffer_head *bh;
2938 loff_t i_size = i_size_read(inode);
2942 if (off+len > i_size)
2945 while (toread > 0) {
2946 tocopy = sb->s_blocksize - offset < toread ?
2947 sb->s_blocksize - offset : toread;
2948 bh = ext3_bread(NULL, inode, blk, 0, &err);
2951 if (!bh) /* A hole? */
2952 memset(data, 0, tocopy);
2954 memcpy(data, bh->b_data+offset, tocopy);
2964 /* Write to quotafile (we know the transaction is already started and has
2965 * enough credits) */
2966 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2967 const char *data, size_t len, loff_t off)
2969 struct inode *inode = sb_dqopt(sb)->files[type];
2970 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2972 int offset = off & (sb->s_blocksize - 1);
2973 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2974 struct buffer_head *bh;
2975 handle_t *handle = journal_current_handle();
2978 ext3_msg(sb, KERN_WARNING,
2979 "warning: quota write (off=%llu, len=%llu)"
2980 " cancelled because transaction is not started.",
2981 (unsigned long long)off, (unsigned long long)len);
2986 * Since we account only one data block in transaction credits,
2987 * then it is impossible to cross a block boundary.
2989 if (sb->s_blocksize - offset < len) {
2990 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
2991 " cancelled because not block aligned",
2992 (unsigned long long)off, (unsigned long long)len);
2995 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2996 bh = ext3_bread(handle, inode, blk, 1, &err);
2999 if (journal_quota) {
3000 err = ext3_journal_get_write_access(handle, bh);
3007 memcpy(bh->b_data+offset, data, len);
3008 flush_dcache_page(bh->b_page);
3011 err = ext3_journal_dirty_metadata(handle, bh);
3013 /* Always do at least ordered writes for quotas */
3014 err = ext3_journal_dirty_data(handle, bh);
3015 mark_buffer_dirty(bh);
3020 mutex_unlock(&inode->i_mutex);
3023 if (inode->i_size < off + len) {
3024 i_size_write(inode, off + len);
3025 EXT3_I(inode)->i_disksize = inode->i_size;
3028 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3029 ext3_mark_inode_dirty(handle, inode);
3030 mutex_unlock(&inode->i_mutex);
3036 static int ext3_get_sb(struct file_system_type *fs_type,
3037 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3039 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
3042 static struct file_system_type ext3_fs_type = {
3043 .owner = THIS_MODULE,
3045 .get_sb = ext3_get_sb,
3046 .kill_sb = kill_block_super,
3047 .fs_flags = FS_REQUIRES_DEV,
3050 static int __init init_ext3_fs(void)
3052 int err = init_ext3_xattr();
3055 err = init_inodecache();
3058 err = register_filesystem(&ext3_fs_type);
3063 destroy_inodecache();
3069 static void __exit exit_ext3_fs(void)
3071 unregister_filesystem(&ext3_fs_type);
3072 destroy_inodecache();
3076 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3077 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3078 MODULE_LICENSE("GPL");
3079 module_init(init_ext3_fs)
3080 module_exit(exit_ext3_fs)