2 * linux/fs/ext4/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/jbd2.h>
24 #include <linux/ext4_fs.h>
25 #include <linux/ext4_jbd2.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/vfs.h>
33 #include <linux/random.h>
34 #include <linux/mount.h>
35 #include <linux/namei.h>
36 #include <linux/quotaops.h>
37 #include <linux/seq_file.h>
39 #include <asm/uaccess.h>
45 static int ext4_load_journal(struct super_block
*, struct ext4_super_block
*,
46 unsigned long journal_devnum
);
47 static int ext4_create_journal(struct super_block
*, struct ext4_super_block
*,
49 static void ext4_commit_super (struct super_block
* sb
,
50 struct ext4_super_block
* es
,
52 static void ext4_mark_recovery_complete(struct super_block
* sb
,
53 struct ext4_super_block
* es
);
54 static void ext4_clear_journal_err(struct super_block
* sb
,
55 struct ext4_super_block
* es
);
56 static int ext4_sync_fs(struct super_block
*sb
, int wait
);
57 static const char *ext4_decode_error(struct super_block
* sb
, int errno
,
59 static int ext4_remount (struct super_block
* sb
, int * flags
, char * data
);
60 static int ext4_statfs (struct dentry
* dentry
, struct kstatfs
* buf
);
61 static void ext4_unlockfs(struct super_block
*sb
);
62 static void ext4_write_super (struct super_block
* sb
);
63 static void ext4_write_super_lockfs(struct super_block
*sb
);
66 ext4_fsblk_t
ext4_block_bitmap(struct ext4_group_desc
*bg
)
68 return le32_to_cpu(bg
->bg_block_bitmap
) |
69 ((ext4_fsblk_t
)le16_to_cpu(bg
->bg_block_bitmap_hi
) << 32);
72 ext4_fsblk_t
ext4_inode_bitmap(struct ext4_group_desc
*bg
)
74 return le32_to_cpu(bg
->bg_inode_bitmap
) |
75 ((ext4_fsblk_t
)le16_to_cpu(bg
->bg_inode_bitmap_hi
) << 32);
78 ext4_fsblk_t
ext4_inode_table(struct ext4_group_desc
*bg
)
80 return le32_to_cpu(bg
->bg_inode_table
) |
81 ((ext4_fsblk_t
)le16_to_cpu(bg
->bg_inode_table_hi
) << 32);
84 void ext4_block_bitmap_set(struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
86 bg
->bg_block_bitmap
= cpu_to_le32((u32
)blk
);
87 bg
->bg_block_bitmap_hi
= cpu_to_le16(blk
>> 32);
90 void ext4_inode_bitmap_set(struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
92 bg
->bg_inode_bitmap
= cpu_to_le32((u32
)blk
);
93 bg
->bg_inode_bitmap_hi
= cpu_to_le16(blk
>> 32);
96 void ext4_inode_table_set(struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
98 bg
->bg_inode_table
= cpu_to_le32((u32
)blk
);
99 bg
->bg_inode_table_hi
= cpu_to_le16(blk
>> 32);
103 * Wrappers for jbd2_journal_start/end.
105 * The only special thing we need to do here is to make sure that all
106 * journal_end calls result in the superblock being marked dirty, so
107 * that sync() will call the filesystem's write_super callback if
110 handle_t
*ext4_journal_start_sb(struct super_block
*sb
, int nblocks
)
114 if (sb
->s_flags
& MS_RDONLY
)
115 return ERR_PTR(-EROFS
);
117 /* Special case here: if the journal has aborted behind our
118 * backs (eg. EIO in the commit thread), then we still need to
119 * take the FS itself readonly cleanly. */
120 journal
= EXT4_SB(sb
)->s_journal
;
121 if (is_journal_aborted(journal
)) {
122 ext4_abort(sb
, __FUNCTION__
,
123 "Detected aborted journal");
124 return ERR_PTR(-EROFS
);
127 return jbd2_journal_start(journal
, nblocks
);
131 * The only special thing we need to do here is to make sure that all
132 * jbd2_journal_stop calls result in the superblock being marked dirty, so
133 * that sync() will call the filesystem's write_super callback if
136 int __ext4_journal_stop(const char *where
, handle_t
*handle
)
138 struct super_block
*sb
;
142 sb
= handle
->h_transaction
->t_journal
->j_private
;
144 rc
= jbd2_journal_stop(handle
);
149 __ext4_std_error(sb
, where
, err
);
153 void ext4_journal_abort_handle(const char *caller
, const char *err_fn
,
154 struct buffer_head
*bh
, handle_t
*handle
, int err
)
157 const char *errstr
= ext4_decode_error(NULL
, err
, nbuf
);
160 BUFFER_TRACE(bh
, "abort");
165 if (is_handle_aborted(handle
))
168 printk(KERN_ERR
"%s: aborting transaction: %s in %s\n",
169 caller
, errstr
, err_fn
);
171 jbd2_journal_abort_handle(handle
);
174 /* Deal with the reporting of failure conditions on a filesystem such as
175 * inconsistencies detected or read IO failures.
177 * On ext2, we can store the error state of the filesystem in the
178 * superblock. That is not possible on ext4, because we may have other
179 * write ordering constraints on the superblock which prevent us from
180 * writing it out straight away; and given that the journal is about to
181 * be aborted, we can't rely on the current, or future, transactions to
182 * write out the superblock safely.
184 * We'll just use the jbd2_journal_abort() error code to record an error in
185 * the journal instead. On recovery, the journal will compain about
186 * that error until we've noted it down and cleared it.
189 static void ext4_handle_error(struct super_block
*sb
)
191 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
193 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
194 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
196 if (sb
->s_flags
& MS_RDONLY
)
199 if (!test_opt (sb
, ERRORS_CONT
)) {
200 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
202 EXT4_SB(sb
)->s_mount_opt
|= EXT4_MOUNT_ABORT
;
204 jbd2_journal_abort(journal
, -EIO
);
206 if (test_opt (sb
, ERRORS_RO
)) {
207 printk (KERN_CRIT
"Remounting filesystem read-only\n");
208 sb
->s_flags
|= MS_RDONLY
;
210 ext4_commit_super(sb
, es
, 1);
211 if (test_opt(sb
, ERRORS_PANIC
))
212 panic("EXT4-fs (device %s): panic forced after error\n",
216 void ext4_error (struct super_block
* sb
, const char * function
,
217 const char * fmt
, ...)
222 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ",sb
->s_id
, function
);
227 ext4_handle_error(sb
);
230 static const char *ext4_decode_error(struct super_block
* sb
, int errno
,
237 errstr
= "IO failure";
240 errstr
= "Out of memory";
243 if (!sb
|| EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
)
244 errstr
= "Journal has aborted";
246 errstr
= "Readonly filesystem";
249 /* If the caller passed in an extra buffer for unknown
250 * errors, textualise them now. Else we just return
253 /* Check for truncated error codes... */
254 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
263 /* __ext4_std_error decodes expected errors from journaling functions
264 * automatically and invokes the appropriate error response. */
266 void __ext4_std_error (struct super_block
* sb
, const char * function
,
272 /* Special case: if the error is EROFS, and we're not already
273 * inside a transaction, then there's really no point in logging
275 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
276 (sb
->s_flags
& MS_RDONLY
))
279 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
280 printk (KERN_CRIT
"EXT4-fs error (device %s) in %s: %s\n",
281 sb
->s_id
, function
, errstr
);
283 ext4_handle_error(sb
);
287 * ext4_abort is a much stronger failure handler than ext4_error. The
288 * abort function may be used to deal with unrecoverable failures such
289 * as journal IO errors or ENOMEM at a critical moment in log management.
291 * We unconditionally force the filesystem into an ABORT|READONLY state,
292 * unless the error response on the fs has been set to panic in which
293 * case we take the easy way out and panic immediately.
296 void ext4_abort (struct super_block
* sb
, const char * function
,
297 const char * fmt
, ...)
301 printk (KERN_CRIT
"ext4_abort called.\n");
304 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ",sb
->s_id
, function
);
309 if (test_opt(sb
, ERRORS_PANIC
))
310 panic("EXT4-fs panic from previous error\n");
312 if (sb
->s_flags
& MS_RDONLY
)
315 printk(KERN_CRIT
"Remounting filesystem read-only\n");
316 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
317 sb
->s_flags
|= MS_RDONLY
;
318 EXT4_SB(sb
)->s_mount_opt
|= EXT4_MOUNT_ABORT
;
319 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
322 void ext4_warning (struct super_block
* sb
, const char * function
,
323 const char * fmt
, ...)
328 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s: ",
335 void ext4_update_dynamic_rev(struct super_block
*sb
)
337 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
339 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
342 ext4_warning(sb
, __FUNCTION__
,
343 "updating to rev %d because of new feature flag, "
344 "running e2fsck is recommended",
347 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
348 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
349 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
350 /* leave es->s_feature_*compat flags alone */
351 /* es->s_uuid will be set by e2fsck if empty */
354 * The rest of the superblock fields should be zero, and if not it
355 * means they are likely already in use, so leave them alone. We
356 * can leave it up to e2fsck to clean up any inconsistencies there.
361 * Open the external journal device
363 static struct block_device
*ext4_blkdev_get(dev_t dev
)
365 struct block_device
*bdev
;
366 char b
[BDEVNAME_SIZE
];
368 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
374 printk(KERN_ERR
"EXT4: failed to open journal device %s: %ld\n",
375 __bdevname(dev
, b
), PTR_ERR(bdev
));
380 * Release the journal device
382 static int ext4_blkdev_put(struct block_device
*bdev
)
385 return blkdev_put(bdev
);
388 static int ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
390 struct block_device
*bdev
;
393 bdev
= sbi
->journal_bdev
;
395 ret
= ext4_blkdev_put(bdev
);
396 sbi
->journal_bdev
= NULL
;
401 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
403 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
406 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
410 printk(KERN_ERR
"sb orphan head is %d\n",
411 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
413 printk(KERN_ERR
"sb_info orphan list:\n");
414 list_for_each(l
, &sbi
->s_orphan
) {
415 struct inode
*inode
= orphan_list_entry(l
);
417 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
418 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
419 inode
->i_mode
, inode
->i_nlink
,
424 static void ext4_put_super (struct super_block
* sb
)
426 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
427 struct ext4_super_block
*es
= sbi
->s_es
;
430 ext4_ext_release(sb
);
431 ext4_xattr_put_super(sb
);
432 jbd2_journal_destroy(sbi
->s_journal
);
433 if (!(sb
->s_flags
& MS_RDONLY
)) {
434 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
435 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
436 BUFFER_TRACE(sbi
->s_sbh
, "marking dirty");
437 mark_buffer_dirty(sbi
->s_sbh
);
438 ext4_commit_super(sb
, es
, 1);
441 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
442 brelse(sbi
->s_group_desc
[i
]);
443 kfree(sbi
->s_group_desc
);
444 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
445 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
446 percpu_counter_destroy(&sbi
->s_dirs_counter
);
449 for (i
= 0; i
< MAXQUOTAS
; i
++)
450 kfree(sbi
->s_qf_names
[i
]);
453 /* Debugging code just in case the in-memory inode orphan list
454 * isn't empty. The on-disk one can be non-empty if we've
455 * detected an error and taken the fs readonly, but the
456 * in-memory list had better be clean by this point. */
457 if (!list_empty(&sbi
->s_orphan
))
458 dump_orphan_list(sb
, sbi
);
459 J_ASSERT(list_empty(&sbi
->s_orphan
));
461 invalidate_bdev(sb
->s_bdev
, 0);
462 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
464 * Invalidate the journal device's buffers. We don't want them
465 * floating about in memory - the physical journal device may
466 * hotswapped, and it breaks the `ro-after' testing code.
468 sync_blockdev(sbi
->journal_bdev
);
469 invalidate_bdev(sbi
->journal_bdev
, 0);
470 ext4_blkdev_remove(sbi
);
472 sb
->s_fs_info
= NULL
;
477 static kmem_cache_t
*ext4_inode_cachep
;
480 * Called inside transaction, so use GFP_NOFS
482 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
484 struct ext4_inode_info
*ei
;
486 ei
= kmem_cache_alloc(ext4_inode_cachep
, SLAB_NOFS
);
489 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
490 ei
->i_acl
= EXT4_ACL_NOT_CACHED
;
491 ei
->i_default_acl
= EXT4_ACL_NOT_CACHED
;
493 ei
->i_block_alloc_info
= NULL
;
494 ei
->vfs_inode
.i_version
= 1;
495 memset(&ei
->i_cached_extent
, 0, sizeof(struct ext4_ext_cache
));
496 return &ei
->vfs_inode
;
499 static void ext4_destroy_inode(struct inode
*inode
)
501 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
504 static void init_once(void * foo
, kmem_cache_t
* cachep
, unsigned long flags
)
506 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
508 if ((flags
& (SLAB_CTOR_VERIFY
|SLAB_CTOR_CONSTRUCTOR
)) ==
509 SLAB_CTOR_CONSTRUCTOR
) {
510 INIT_LIST_HEAD(&ei
->i_orphan
);
511 #ifdef CONFIG_EXT4DEV_FS_XATTR
512 init_rwsem(&ei
->xattr_sem
);
514 mutex_init(&ei
->truncate_mutex
);
515 inode_init_once(&ei
->vfs_inode
);
519 static int init_inodecache(void)
521 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
522 sizeof(struct ext4_inode_info
),
523 0, (SLAB_RECLAIM_ACCOUNT
|
526 if (ext4_inode_cachep
== NULL
)
531 static void destroy_inodecache(void)
533 kmem_cache_destroy(ext4_inode_cachep
);
536 static void ext4_clear_inode(struct inode
*inode
)
538 struct ext4_block_alloc_info
*rsv
= EXT4_I(inode
)->i_block_alloc_info
;
539 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
540 if (EXT4_I(inode
)->i_acl
&&
541 EXT4_I(inode
)->i_acl
!= EXT4_ACL_NOT_CACHED
) {
542 posix_acl_release(EXT4_I(inode
)->i_acl
);
543 EXT4_I(inode
)->i_acl
= EXT4_ACL_NOT_CACHED
;
545 if (EXT4_I(inode
)->i_default_acl
&&
546 EXT4_I(inode
)->i_default_acl
!= EXT4_ACL_NOT_CACHED
) {
547 posix_acl_release(EXT4_I(inode
)->i_default_acl
);
548 EXT4_I(inode
)->i_default_acl
= EXT4_ACL_NOT_CACHED
;
551 ext4_discard_reservation(inode
);
552 EXT4_I(inode
)->i_block_alloc_info
= NULL
;
557 static inline void ext4_show_quota_options(struct seq_file
*seq
, struct super_block
*sb
)
559 #if defined(CONFIG_QUOTA)
560 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
562 if (sbi
->s_jquota_fmt
)
563 seq_printf(seq
, ",jqfmt=%s",
564 (sbi
->s_jquota_fmt
== QFMT_VFS_OLD
) ? "vfsold": "vfsv0");
566 if (sbi
->s_qf_names
[USRQUOTA
])
567 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
569 if (sbi
->s_qf_names
[GRPQUOTA
])
570 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
572 if (sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
)
573 seq_puts(seq
, ",usrquota");
575 if (sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
)
576 seq_puts(seq
, ",grpquota");
580 static int ext4_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
582 struct super_block
*sb
= vfs
->mnt_sb
;
584 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
585 seq_puts(seq
, ",data=journal");
586 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
587 seq_puts(seq
, ",data=ordered");
588 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
589 seq_puts(seq
, ",data=writeback");
591 ext4_show_quota_options(seq
, sb
);
597 static struct dentry
*ext4_get_dentry(struct super_block
*sb
, void *vobjp
)
600 unsigned long ino
= objp
[0];
601 __u32 generation
= objp
[1];
603 struct dentry
*result
;
605 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
606 return ERR_PTR(-ESTALE
);
607 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
608 return ERR_PTR(-ESTALE
);
610 /* iget isn't really right if the inode is currently unallocated!!
612 * ext4_read_inode will return a bad_inode if the inode had been
613 * deleted, so we should be safe.
615 * Currently we don't know the generation for parent directory, so
616 * a generation of 0 means "accept any"
618 inode
= iget(sb
, ino
);
620 return ERR_PTR(-ENOMEM
);
621 if (is_bad_inode(inode
) ||
622 (generation
&& inode
->i_generation
!= generation
)) {
624 return ERR_PTR(-ESTALE
);
626 /* now to find a dentry.
627 * If possible, get a well-connected one
629 result
= d_alloc_anon(inode
);
632 return ERR_PTR(-ENOMEM
);
638 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
639 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
641 static int ext4_dquot_initialize(struct inode
*inode
, int type
);
642 static int ext4_dquot_drop(struct inode
*inode
);
643 static int ext4_write_dquot(struct dquot
*dquot
);
644 static int ext4_acquire_dquot(struct dquot
*dquot
);
645 static int ext4_release_dquot(struct dquot
*dquot
);
646 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
647 static int ext4_write_info(struct super_block
*sb
, int type
);
648 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
, char *path
);
649 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
650 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
651 size_t len
, loff_t off
);
652 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
653 const char *data
, size_t len
, loff_t off
);
655 static struct dquot_operations ext4_quota_operations
= {
656 .initialize
= ext4_dquot_initialize
,
657 .drop
= ext4_dquot_drop
,
658 .alloc_space
= dquot_alloc_space
,
659 .alloc_inode
= dquot_alloc_inode
,
660 .free_space
= dquot_free_space
,
661 .free_inode
= dquot_free_inode
,
662 .transfer
= dquot_transfer
,
663 .write_dquot
= ext4_write_dquot
,
664 .acquire_dquot
= ext4_acquire_dquot
,
665 .release_dquot
= ext4_release_dquot
,
666 .mark_dirty
= ext4_mark_dquot_dirty
,
667 .write_info
= ext4_write_info
670 static struct quotactl_ops ext4_qctl_operations
= {
671 .quota_on
= ext4_quota_on
,
672 .quota_off
= vfs_quota_off
,
673 .quota_sync
= vfs_quota_sync
,
674 .get_info
= vfs_get_dqinfo
,
675 .set_info
= vfs_set_dqinfo
,
676 .get_dqblk
= vfs_get_dqblk
,
677 .set_dqblk
= vfs_set_dqblk
681 static struct super_operations ext4_sops
= {
682 .alloc_inode
= ext4_alloc_inode
,
683 .destroy_inode
= ext4_destroy_inode
,
684 .read_inode
= ext4_read_inode
,
685 .write_inode
= ext4_write_inode
,
686 .dirty_inode
= ext4_dirty_inode
,
687 .delete_inode
= ext4_delete_inode
,
688 .put_super
= ext4_put_super
,
689 .write_super
= ext4_write_super
,
690 .sync_fs
= ext4_sync_fs
,
691 .write_super_lockfs
= ext4_write_super_lockfs
,
692 .unlockfs
= ext4_unlockfs
,
693 .statfs
= ext4_statfs
,
694 .remount_fs
= ext4_remount
,
695 .clear_inode
= ext4_clear_inode
,
696 .show_options
= ext4_show_options
,
698 .quota_read
= ext4_quota_read
,
699 .quota_write
= ext4_quota_write
,
703 static struct export_operations ext4_export_ops
= {
704 .get_parent
= ext4_get_parent
,
705 .get_dentry
= ext4_get_dentry
,
709 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
710 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
711 Opt_nouid32
, Opt_nocheck
, Opt_debug
, Opt_oldalloc
, Opt_orlov
,
712 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
713 Opt_reservation
, Opt_noreservation
, Opt_noload
, Opt_nobh
, Opt_bh
,
714 Opt_commit
, Opt_journal_update
, Opt_journal_inum
, Opt_journal_dev
,
715 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
716 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
717 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_quota
, Opt_noquota
,
718 Opt_ignore
, Opt_barrier
, Opt_err
, Opt_resize
, Opt_usrquota
,
719 Opt_grpquota
, Opt_extents
,
722 static match_table_t tokens
= {
723 {Opt_bsd_df
, "bsddf"},
724 {Opt_minix_df
, "minixdf"},
725 {Opt_grpid
, "grpid"},
726 {Opt_grpid
, "bsdgroups"},
727 {Opt_nogrpid
, "nogrpid"},
728 {Opt_nogrpid
, "sysvgroups"},
729 {Opt_resgid
, "resgid=%u"},
730 {Opt_resuid
, "resuid=%u"},
732 {Opt_err_cont
, "errors=continue"},
733 {Opt_err_panic
, "errors=panic"},
734 {Opt_err_ro
, "errors=remount-ro"},
735 {Opt_nouid32
, "nouid32"},
736 {Opt_nocheck
, "nocheck"},
737 {Opt_nocheck
, "check=none"},
738 {Opt_debug
, "debug"},
739 {Opt_oldalloc
, "oldalloc"},
740 {Opt_orlov
, "orlov"},
741 {Opt_user_xattr
, "user_xattr"},
742 {Opt_nouser_xattr
, "nouser_xattr"},
744 {Opt_noacl
, "noacl"},
745 {Opt_reservation
, "reservation"},
746 {Opt_noreservation
, "noreservation"},
747 {Opt_noload
, "noload"},
750 {Opt_commit
, "commit=%u"},
751 {Opt_journal_update
, "journal=update"},
752 {Opt_journal_inum
, "journal=%u"},
753 {Opt_journal_dev
, "journal_dev=%u"},
754 {Opt_abort
, "abort"},
755 {Opt_data_journal
, "data=journal"},
756 {Opt_data_ordered
, "data=ordered"},
757 {Opt_data_writeback
, "data=writeback"},
758 {Opt_offusrjquota
, "usrjquota="},
759 {Opt_usrjquota
, "usrjquota=%s"},
760 {Opt_offgrpjquota
, "grpjquota="},
761 {Opt_grpjquota
, "grpjquota=%s"},
762 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
763 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
764 {Opt_grpquota
, "grpquota"},
765 {Opt_noquota
, "noquota"},
766 {Opt_quota
, "quota"},
767 {Opt_usrquota
, "usrquota"},
768 {Opt_barrier
, "barrier=%u"},
769 {Opt_extents
, "extents"},
771 {Opt_resize
, "resize"},
774 static ext4_fsblk_t
get_sb_block(void **data
)
776 ext4_fsblk_t sb_block
;
777 char *options
= (char *) *data
;
779 if (!options
|| strncmp(options
, "sb=", 3) != 0)
780 return 1; /* Default location */
782 /*todo: use simple_strtoll with >32bit ext4 */
783 sb_block
= simple_strtoul(options
, &options
, 0);
784 if (*options
&& *options
!= ',') {
785 printk("EXT4-fs: Invalid sb specification: %s\n",
791 *data
= (void *) options
;
795 static int parse_options (char *options
, struct super_block
*sb
,
796 unsigned int *inum
, unsigned long *journal_devnum
,
797 ext4_fsblk_t
*n_blocks_count
, int is_remount
)
799 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
801 substring_t args
[MAX_OPT_ARGS
];
812 while ((p
= strsep (&options
, ",")) != NULL
) {
817 token
= match_token(p
, tokens
, args
);
820 clear_opt (sbi
->s_mount_opt
, MINIX_DF
);
823 set_opt (sbi
->s_mount_opt
, MINIX_DF
);
826 set_opt (sbi
->s_mount_opt
, GRPID
);
829 clear_opt (sbi
->s_mount_opt
, GRPID
);
832 if (match_int(&args
[0], &option
))
834 sbi
->s_resuid
= option
;
837 if (match_int(&args
[0], &option
))
839 sbi
->s_resgid
= option
;
842 /* handled by get_sb_block() instead of here */
843 /* *sb_block = match_int(&args[0]); */
846 clear_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
847 clear_opt (sbi
->s_mount_opt
, ERRORS_RO
);
848 set_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
851 clear_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
852 clear_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
853 set_opt (sbi
->s_mount_opt
, ERRORS_RO
);
856 clear_opt (sbi
->s_mount_opt
, ERRORS_RO
);
857 clear_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
858 set_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
861 set_opt (sbi
->s_mount_opt
, NO_UID32
);
864 clear_opt (sbi
->s_mount_opt
, CHECK
);
867 set_opt (sbi
->s_mount_opt
, DEBUG
);
870 set_opt (sbi
->s_mount_opt
, OLDALLOC
);
873 clear_opt (sbi
->s_mount_opt
, OLDALLOC
);
875 #ifdef CONFIG_EXT4DEV_FS_XATTR
877 set_opt (sbi
->s_mount_opt
, XATTR_USER
);
879 case Opt_nouser_xattr
:
880 clear_opt (sbi
->s_mount_opt
, XATTR_USER
);
884 case Opt_nouser_xattr
:
885 printk("EXT4 (no)user_xattr options not supported\n");
888 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
890 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
893 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
898 printk("EXT4 (no)acl options not supported\n");
901 case Opt_reservation
:
902 set_opt(sbi
->s_mount_opt
, RESERVATION
);
904 case Opt_noreservation
:
905 clear_opt(sbi
->s_mount_opt
, RESERVATION
);
907 case Opt_journal_update
:
909 /* Eventually we will want to be able to create
910 a journal file here. For now, only allow the
911 user to specify an existing inode to be the
914 printk(KERN_ERR
"EXT4-fs: cannot specify "
915 "journal on remount\n");
918 set_opt (sbi
->s_mount_opt
, UPDATE_JOURNAL
);
920 case Opt_journal_inum
:
922 printk(KERN_ERR
"EXT4-fs: cannot specify "
923 "journal on remount\n");
926 if (match_int(&args
[0], &option
))
930 case Opt_journal_dev
:
932 printk(KERN_ERR
"EXT4-fs: cannot specify "
933 "journal on remount\n");
936 if (match_int(&args
[0], &option
))
938 *journal_devnum
= option
;
941 set_opt (sbi
->s_mount_opt
, NOLOAD
);
944 if (match_int(&args
[0], &option
))
949 option
= JBD_DEFAULT_MAX_COMMIT_AGE
;
950 sbi
->s_commit_interval
= HZ
* option
;
952 case Opt_data_journal
:
953 data_opt
= EXT4_MOUNT_JOURNAL_DATA
;
955 case Opt_data_ordered
:
956 data_opt
= EXT4_MOUNT_ORDERED_DATA
;
958 case Opt_data_writeback
:
959 data_opt
= EXT4_MOUNT_WRITEBACK_DATA
;
962 if ((sbi
->s_mount_opt
& EXT4_MOUNT_DATA_FLAGS
)
965 "EXT4-fs: cannot change data "
966 "mode on remount\n");
970 sbi
->s_mount_opt
&= ~EXT4_MOUNT_DATA_FLAGS
;
971 sbi
->s_mount_opt
|= data_opt
;
981 if (sb_any_quota_enabled(sb
)) {
983 "EXT4-fs: Cannot change journalled "
984 "quota options when quota turned on.\n");
987 qname
= match_strdup(&args
[0]);
990 "EXT4-fs: not enough memory for "
991 "storing quotafile name.\n");
994 if (sbi
->s_qf_names
[qtype
] &&
995 strcmp(sbi
->s_qf_names
[qtype
], qname
)) {
997 "EXT4-fs: %s quota file already "
998 "specified.\n", QTYPE2NAME(qtype
));
1002 sbi
->s_qf_names
[qtype
] = qname
;
1003 if (strchr(sbi
->s_qf_names
[qtype
], '/')) {
1005 "EXT4-fs: quotafile must be on "
1006 "filesystem root.\n");
1007 kfree(sbi
->s_qf_names
[qtype
]);
1008 sbi
->s_qf_names
[qtype
] = NULL
;
1011 set_opt(sbi
->s_mount_opt
, QUOTA
);
1013 case Opt_offusrjquota
:
1016 case Opt_offgrpjquota
:
1019 if (sb_any_quota_enabled(sb
)) {
1020 printk(KERN_ERR
"EXT4-fs: Cannot change "
1021 "journalled quota options when "
1022 "quota turned on.\n");
1026 * The space will be released later when all options
1027 * are confirmed to be correct
1029 sbi
->s_qf_names
[qtype
] = NULL
;
1031 case Opt_jqfmt_vfsold
:
1032 sbi
->s_jquota_fmt
= QFMT_VFS_OLD
;
1034 case Opt_jqfmt_vfsv0
:
1035 sbi
->s_jquota_fmt
= QFMT_VFS_V0
;
1039 set_opt(sbi
->s_mount_opt
, QUOTA
);
1040 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
1043 set_opt(sbi
->s_mount_opt
, QUOTA
);
1044 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1047 if (sb_any_quota_enabled(sb
)) {
1048 printk(KERN_ERR
"EXT4-fs: Cannot change quota "
1049 "options when quota turned on.\n");
1052 clear_opt(sbi
->s_mount_opt
, QUOTA
);
1053 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1054 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1062 case Opt_offusrjquota
:
1063 case Opt_offgrpjquota
:
1064 case Opt_jqfmt_vfsold
:
1065 case Opt_jqfmt_vfsv0
:
1067 "EXT4-fs: journalled quota options not "
1074 set_opt(sbi
->s_mount_opt
, ABORT
);
1077 if (match_int(&args
[0], &option
))
1080 set_opt(sbi
->s_mount_opt
, BARRIER
);
1082 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1088 printk("EXT4-fs: resize option only available "
1092 if (match_int(&args
[0], &option
) != 0)
1094 *n_blocks_count
= option
;
1097 set_opt(sbi
->s_mount_opt
, NOBH
);
1100 clear_opt(sbi
->s_mount_opt
, NOBH
);
1103 set_opt (sbi
->s_mount_opt
, EXTENTS
);
1107 "EXT4-fs: Unrecognized mount option \"%s\" "
1108 "or missing value\n", p
);
1113 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1114 if ((sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
) &&
1115 sbi
->s_qf_names
[USRQUOTA
])
1116 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1118 if ((sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
) &&
1119 sbi
->s_qf_names
[GRPQUOTA
])
1120 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1122 if ((sbi
->s_qf_names
[USRQUOTA
] &&
1123 (sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
)) ||
1124 (sbi
->s_qf_names
[GRPQUOTA
] &&
1125 (sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
))) {
1126 printk(KERN_ERR
"EXT4-fs: old and new quota "
1127 "format mixing.\n");
1131 if (!sbi
->s_jquota_fmt
) {
1132 printk(KERN_ERR
"EXT4-fs: journalled quota format "
1133 "not specified.\n");
1137 if (sbi
->s_jquota_fmt
) {
1138 printk(KERN_ERR
"EXT4-fs: journalled quota format "
1139 "specified with no journalling "
1148 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1151 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1154 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1155 printk (KERN_ERR
"EXT4-fs warning: revision level too high, "
1156 "forcing read-only mode\n");
1161 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1162 printk (KERN_WARNING
"EXT4-fs warning: mounting unchecked fs, "
1163 "running e2fsck is recommended\n");
1164 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1165 printk (KERN_WARNING
1166 "EXT4-fs warning: mounting fs with errors, "
1167 "running e2fsck is recommended\n");
1168 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
1169 le16_to_cpu(es
->s_mnt_count
) >=
1170 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1171 printk (KERN_WARNING
1172 "EXT4-fs warning: maximal mount count reached, "
1173 "running e2fsck is recommended\n");
1174 else if (le32_to_cpu(es
->s_checkinterval
) &&
1175 (le32_to_cpu(es
->s_lastcheck
) +
1176 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1177 printk (KERN_WARNING
1178 "EXT4-fs warning: checktime reached, "
1179 "running e2fsck is recommended\n");
1181 /* @@@ We _will_ want to clear the valid bit if we find
1182 inconsistencies, to force a fsck at reboot. But for
1183 a plain journaled filesystem we can keep it set as
1184 valid forever! :) */
1185 es
->s_state
= cpu_to_le16(le16_to_cpu(es
->s_state
) & ~EXT4_VALID_FS
);
1187 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1188 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1189 es
->s_mnt_count
=cpu_to_le16(le16_to_cpu(es
->s_mnt_count
) + 1);
1190 es
->s_mtime
= cpu_to_le32(get_seconds());
1191 ext4_update_dynamic_rev(sb
);
1192 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1194 ext4_commit_super(sb
, es
, 1);
1195 if (test_opt(sb
, DEBUG
))
1196 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%lu, "
1197 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1199 sbi
->s_groups_count
,
1200 EXT4_BLOCKS_PER_GROUP(sb
),
1201 EXT4_INODES_PER_GROUP(sb
),
1204 printk(KERN_INFO
"EXT4 FS on %s, ", sb
->s_id
);
1205 if (EXT4_SB(sb
)->s_journal
->j_inode
== NULL
) {
1206 char b
[BDEVNAME_SIZE
];
1208 printk("external journal on %s\n",
1209 bdevname(EXT4_SB(sb
)->s_journal
->j_dev
, b
));
1211 printk("internal journal\n");
1216 /* Called at mount-time, super-block is locked */
1217 static int ext4_check_descriptors (struct super_block
* sb
)
1219 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1220 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
1221 ext4_fsblk_t last_block
;
1222 ext4_fsblk_t block_bitmap
;
1223 ext4_fsblk_t inode_bitmap
;
1224 ext4_fsblk_t inode_table
;
1225 struct ext4_group_desc
* gdp
= NULL
;
1229 ext4_debug ("Checking group descriptors");
1231 for (i
= 0; i
< sbi
->s_groups_count
; i
++)
1233 if (i
== sbi
->s_groups_count
- 1)
1234 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
1236 last_block
= first_block
+
1237 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
1239 if ((i
% EXT4_DESC_PER_BLOCK(sb
)) == 0)
1240 gdp
= (struct ext4_group_desc
*)
1241 sbi
->s_group_desc
[desc_block
++]->b_data
;
1242 block_bitmap
= ext4_block_bitmap(gdp
);
1243 if (block_bitmap
< first_block
|| block_bitmap
> last_block
)
1245 ext4_error (sb
, "ext4_check_descriptors",
1246 "Block bitmap for group %d"
1247 " not in group (block %llu)!",
1251 inode_bitmap
= ext4_inode_bitmap(gdp
);
1252 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
)
1254 ext4_error (sb
, "ext4_check_descriptors",
1255 "Inode bitmap for group %d"
1256 " not in group (block %llu)!",
1260 inode_table
= ext4_inode_table(gdp
);
1261 if (inode_table
< first_block
||
1262 inode_table
+ sbi
->s_itb_per_group
> last_block
)
1264 ext4_error (sb
, "ext4_check_descriptors",
1265 "Inode table for group %d"
1266 " not in group (block %llu)!",
1270 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
1271 gdp
= (struct ext4_group_desc
*)
1272 ((__u8
*)gdp
+ EXT4_DESC_SIZE(sb
));
1275 ext4_free_blocks_count_set(sbi
->s_es
, ext4_count_free_blocks(sb
));
1276 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
1281 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1282 * the superblock) which were deleted from all directories, but held open by
1283 * a process at the time of a crash. We walk the list and try to delete these
1284 * inodes at recovery time (only with a read-write filesystem).
1286 * In order to keep the orphan inode chain consistent during traversal (in
1287 * case of crash during recovery), we link each inode into the superblock
1288 * orphan list_head and handle it the same way as an inode deletion during
1289 * normal operation (which journals the operations for us).
1291 * We only do an iget() and an iput() on each inode, which is very safe if we
1292 * accidentally point at an in-use or already deleted inode. The worst that
1293 * can happen in this case is that we get a "bit already cleared" message from
1294 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1295 * e2fsck was run on this filesystem, and it must have already done the orphan
1296 * inode cleanup for us, so we can safely abort without any further action.
1298 static void ext4_orphan_cleanup (struct super_block
* sb
,
1299 struct ext4_super_block
* es
)
1301 unsigned int s_flags
= sb
->s_flags
;
1302 int nr_orphans
= 0, nr_truncates
= 0;
1306 if (!es
->s_last_orphan
) {
1307 jbd_debug(4, "no orphan inodes to clean up\n");
1311 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
1312 if (es
->s_last_orphan
)
1313 jbd_debug(1, "Errors on filesystem, "
1314 "clearing orphan list.\n");
1315 es
->s_last_orphan
= 0;
1316 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1320 if (s_flags
& MS_RDONLY
) {
1321 printk(KERN_INFO
"EXT4-fs: %s: orphan cleanup on readonly fs\n",
1323 sb
->s_flags
&= ~MS_RDONLY
;
1326 /* Needed for iput() to work correctly and not trash data */
1327 sb
->s_flags
|= MS_ACTIVE
;
1328 /* Turn on quotas so that they are updated correctly */
1329 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1330 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
1331 int ret
= ext4_quota_on_mount(sb
, i
);
1334 "EXT4-fs: Cannot turn on journalled "
1335 "quota: error %d\n", ret
);
1340 while (es
->s_last_orphan
) {
1341 struct inode
*inode
;
1344 ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
)))) {
1345 es
->s_last_orphan
= 0;
1349 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
1351 if (inode
->i_nlink
) {
1353 "%s: truncating inode %lu to %Ld bytes\n",
1354 __FUNCTION__
, inode
->i_ino
, inode
->i_size
);
1355 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1356 inode
->i_ino
, inode
->i_size
);
1357 ext4_truncate(inode
);
1361 "%s: deleting unreferenced inode %lu\n",
1362 __FUNCTION__
, inode
->i_ino
);
1363 jbd_debug(2, "deleting unreferenced inode %lu\n",
1367 iput(inode
); /* The delete magic happens here! */
1370 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1373 printk(KERN_INFO
"EXT4-fs: %s: %d orphan inode%s deleted\n",
1374 sb
->s_id
, PLURAL(nr_orphans
));
1376 printk(KERN_INFO
"EXT4-fs: %s: %d truncate%s cleaned up\n",
1377 sb
->s_id
, PLURAL(nr_truncates
));
1379 /* Turn quotas off */
1380 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1381 if (sb_dqopt(sb
)->files
[i
])
1382 vfs_quota_off(sb
, i
);
1385 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
1388 #define log2(n) ffz(~(n))
1391 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1392 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1393 * We need to be 1 filesystem block less than the 2^32 sector limit.
1395 static loff_t
ext4_max_size(int bits
)
1397 loff_t res
= EXT4_NDIR_BLOCKS
;
1398 /* This constant is calculated to be the largest file size for a
1399 * dense, 4k-blocksize file such that the total number of
1400 * sectors in the file, including data and all indirect blocks,
1401 * does not exceed 2^32. */
1402 const loff_t upper_limit
= 0x1ff7fffd000LL
;
1404 res
+= 1LL << (bits
-2);
1405 res
+= 1LL << (2*(bits
-2));
1406 res
+= 1LL << (3*(bits
-2));
1408 if (res
> upper_limit
)
1413 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
1414 ext4_fsblk_t logic_sb_block
,
1417 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1418 unsigned long bg
, first_meta_bg
;
1421 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
1423 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
1425 return (logic_sb_block
+ nr
+ 1);
1426 bg
= sbi
->s_desc_per_block
* nr
;
1427 if (ext4_bg_has_super(sb
, bg
))
1429 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
1433 static int ext4_fill_super (struct super_block
*sb
, void *data
, int silent
)
1435 struct buffer_head
* bh
;
1436 struct ext4_super_block
*es
= NULL
;
1437 struct ext4_sb_info
*sbi
;
1439 ext4_fsblk_t sb_block
= get_sb_block(&data
);
1440 ext4_fsblk_t logic_sb_block
;
1441 unsigned long offset
= 0;
1442 unsigned int journal_inum
= 0;
1443 unsigned long journal_devnum
= 0;
1444 unsigned long def_mount_opts
;
1454 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
1457 sb
->s_fs_info
= sbi
;
1458 sbi
->s_mount_opt
= 0;
1459 sbi
->s_resuid
= EXT4_DEF_RESUID
;
1460 sbi
->s_resgid
= EXT4_DEF_RESGID
;
1464 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
1466 printk(KERN_ERR
"EXT4-fs: unable to set blocksize\n");
1471 * The ext4 superblock will not be buffer aligned for other than 1kB
1472 * block sizes. We need to calculate the offset from buffer start.
1474 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
1475 logic_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
1476 offset
= sector_div(logic_sb_block
, blocksize
);
1478 logic_sb_block
= sb_block
;
1481 if (!(bh
= sb_bread(sb
, logic_sb_block
))) {
1482 printk (KERN_ERR
"EXT4-fs: unable to read superblock\n");
1486 * Note: s_es must be initialized as soon as possible because
1487 * some ext4 macro-instructions depend on its value
1489 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
1491 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
1492 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
1495 /* Set defaults before we parse the mount options */
1496 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
1497 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
1498 set_opt(sbi
->s_mount_opt
, DEBUG
);
1499 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
1500 set_opt(sbi
->s_mount_opt
, GRPID
);
1501 if (def_mount_opts
& EXT4_DEFM_UID16
)
1502 set_opt(sbi
->s_mount_opt
, NO_UID32
);
1503 if (def_mount_opts
& EXT4_DEFM_XATTR_USER
)
1504 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
1505 if (def_mount_opts
& EXT4_DEFM_ACL
)
1506 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1507 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
1508 sbi
->s_mount_opt
|= EXT4_MOUNT_JOURNAL_DATA
;
1509 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
1510 sbi
->s_mount_opt
|= EXT4_MOUNT_ORDERED_DATA
;
1511 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
1512 sbi
->s_mount_opt
|= EXT4_MOUNT_WRITEBACK_DATA
;
1514 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
1515 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1516 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_RO
)
1517 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1519 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
1520 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
1522 set_opt(sbi
->s_mount_opt
, RESERVATION
);
1524 if (!parse_options ((char *) data
, sb
, &journal_inum
, &journal_devnum
,
1528 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
1529 ((sbi
->s_mount_opt
& EXT4_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
1531 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
1532 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
1533 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
1534 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
1536 "EXT4-fs warning: feature flags set on rev 0 fs, "
1537 "running e2fsck is recommended\n");
1539 * Check feature flags regardless of the revision level, since we
1540 * previously didn't change the revision level when setting the flags,
1541 * so there is a chance incompat flags are set on a rev 0 filesystem.
1543 features
= EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
);
1545 printk(KERN_ERR
"EXT4-fs: %s: couldn't mount because of "
1546 "unsupported optional features (%x).\n",
1547 sb
->s_id
, le32_to_cpu(features
));
1550 features
= EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
);
1551 if (!(sb
->s_flags
& MS_RDONLY
) && features
) {
1552 printk(KERN_ERR
"EXT4-fs: %s: couldn't mount RDWR because of "
1553 "unsupported optional features (%x).\n",
1554 sb
->s_id
, le32_to_cpu(features
));
1557 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
1559 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
1560 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
1562 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
1563 blocksize
, sb
->s_id
);
1567 hblock
= bdev_hardsect_size(sb
->s_bdev
);
1568 if (sb
->s_blocksize
!= blocksize
) {
1570 * Make sure the blocksize for the filesystem is larger
1571 * than the hardware sectorsize for the machine.
1573 if (blocksize
< hblock
) {
1574 printk(KERN_ERR
"EXT4-fs: blocksize %d too small for "
1575 "device blocksize %d.\n", blocksize
, hblock
);
1580 sb_set_blocksize(sb
, blocksize
);
1581 logic_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
1582 offset
= sector_div(logic_sb_block
, blocksize
);
1583 bh
= sb_bread(sb
, logic_sb_block
);
1586 "EXT4-fs: Can't read superblock on 2nd try.\n");
1589 es
= (struct ext4_super_block
*)(((char *)bh
->b_data
) + offset
);
1591 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
1593 "EXT4-fs: Magic mismatch, very weird !\n");
1598 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
);
1600 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
1601 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
1602 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
1604 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
1605 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
1606 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
1607 (sbi
->s_inode_size
& (sbi
->s_inode_size
- 1)) ||
1608 (sbi
->s_inode_size
> blocksize
)) {
1610 "EXT4-fs: unsupported inode size: %d\n",
1615 sbi
->s_frag_size
= EXT4_MIN_FRAG_SIZE
<<
1616 le32_to_cpu(es
->s_log_frag_size
);
1617 if (blocksize
!= sbi
->s_frag_size
) {
1619 "EXT4-fs: fragsize %lu != blocksize %u (unsupported)\n",
1620 sbi
->s_frag_size
, blocksize
);
1623 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
1624 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
1625 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE
||
1626 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
1627 sbi
->s_desc_size
& (sbi
->s_desc_size
- 1)) {
1629 "EXT4-fs: unsupported descriptor size %ld\n",
1634 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
1635 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
1636 sbi
->s_frags_per_group
= le32_to_cpu(es
->s_frags_per_group
);
1637 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
1638 if (EXT4_INODE_SIZE(sb
) == 0)
1640 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
1641 if (sbi
->s_inodes_per_block
== 0)
1643 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
1644 sbi
->s_inodes_per_block
;
1645 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
1647 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
1648 sbi
->s_addr_per_block_bits
= log2(EXT4_ADDR_PER_BLOCK(sb
));
1649 sbi
->s_desc_per_block_bits
= log2(EXT4_DESC_PER_BLOCK(sb
));
1650 for (i
=0; i
< 4; i
++)
1651 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
1652 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
1654 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
1656 "EXT4-fs: #blocks per group too big: %lu\n",
1657 sbi
->s_blocks_per_group
);
1660 if (sbi
->s_frags_per_group
> blocksize
* 8) {
1662 "EXT4-fs: #fragments per group too big: %lu\n",
1663 sbi
->s_frags_per_group
);
1666 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
1668 "EXT4-fs: #inodes per group too big: %lu\n",
1669 sbi
->s_inodes_per_group
);
1673 if (ext4_blocks_count(es
) >
1674 (sector_t
)(~0ULL) >> (sb
->s_blocksize_bits
- 9)) {
1675 printk(KERN_ERR
"EXT4-fs: filesystem on %s:"
1676 " too large to mount safely\n", sb
->s_id
);
1677 if (sizeof(sector_t
) < 8)
1678 printk(KERN_WARNING
"EXT4-fs: CONFIG_LBD not "
1683 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
1685 blocks_count
= (ext4_blocks_count(es
) -
1686 le32_to_cpu(es
->s_first_data_block
) +
1687 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
1688 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
1689 sbi
->s_groups_count
= blocks_count
;
1690 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
1691 EXT4_DESC_PER_BLOCK(sb
);
1692 sbi
->s_group_desc
= kmalloc(db_count
* sizeof (struct buffer_head
*),
1694 if (sbi
->s_group_desc
== NULL
) {
1695 printk (KERN_ERR
"EXT4-fs: not enough memory\n");
1699 bgl_lock_init(&sbi
->s_blockgroup_lock
);
1701 for (i
= 0; i
< db_count
; i
++) {
1702 block
= descriptor_loc(sb
, logic_sb_block
, i
);
1703 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
1704 if (!sbi
->s_group_desc
[i
]) {
1705 printk (KERN_ERR
"EXT4-fs: "
1706 "can't read group descriptor %d\n", i
);
1711 if (!ext4_check_descriptors (sb
)) {
1712 printk(KERN_ERR
"EXT4-fs: group descriptors corrupted!\n");
1715 sbi
->s_gdb_count
= db_count
;
1716 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
1717 spin_lock_init(&sbi
->s_next_gen_lock
);
1719 percpu_counter_init(&sbi
->s_freeblocks_counter
,
1720 ext4_count_free_blocks(sb
));
1721 percpu_counter_init(&sbi
->s_freeinodes_counter
,
1722 ext4_count_free_inodes(sb
));
1723 percpu_counter_init(&sbi
->s_dirs_counter
,
1724 ext4_count_dirs(sb
));
1726 /* per fileystem reservation list head & lock */
1727 spin_lock_init(&sbi
->s_rsv_window_lock
);
1728 sbi
->s_rsv_window_root
= RB_ROOT
;
1729 /* Add a single, static dummy reservation to the start of the
1730 * reservation window list --- it gives us a placeholder for
1731 * append-at-start-of-list which makes the allocation logic
1732 * _much_ simpler. */
1733 sbi
->s_rsv_window_head
.rsv_start
= EXT4_RESERVE_WINDOW_NOT_ALLOCATED
;
1734 sbi
->s_rsv_window_head
.rsv_end
= EXT4_RESERVE_WINDOW_NOT_ALLOCATED
;
1735 sbi
->s_rsv_window_head
.rsv_alloc_hit
= 0;
1736 sbi
->s_rsv_window_head
.rsv_goal_size
= 0;
1737 ext4_rsv_window_add(sb
, &sbi
->s_rsv_window_head
);
1740 * set up enough so that it can read an inode
1742 sb
->s_op
= &ext4_sops
;
1743 sb
->s_export_op
= &ext4_export_ops
;
1744 sb
->s_xattr
= ext4_xattr_handlers
;
1746 sb
->s_qcop
= &ext4_qctl_operations
;
1747 sb
->dq_op
= &ext4_quota_operations
;
1749 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
1753 needs_recovery
= (es
->s_last_orphan
!= 0 ||
1754 EXT4_HAS_INCOMPAT_FEATURE(sb
,
1755 EXT4_FEATURE_INCOMPAT_RECOVER
));
1758 * The first inode we look at is the journal inode. Don't try
1759 * root first: it may be modified in the journal!
1761 if (!test_opt(sb
, NOLOAD
) &&
1762 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
1763 if (ext4_load_journal(sb
, es
, journal_devnum
))
1765 } else if (journal_inum
) {
1766 if (ext4_create_journal(sb
, es
, journal_inum
))
1771 "ext4: No journal on filesystem on %s\n",
1776 /* We have now updated the journal if required, so we can
1777 * validate the data journaling mode. */
1778 switch (test_opt(sb
, DATA_FLAGS
)) {
1780 /* No mode set, assume a default based on the journal
1781 capabilities: ORDERED_DATA if the journal can
1782 cope, else JOURNAL_DATA */
1783 if (jbd2_journal_check_available_features
1784 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
1785 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
1787 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
1790 case EXT4_MOUNT_ORDERED_DATA
:
1791 case EXT4_MOUNT_WRITEBACK_DATA
:
1792 if (!jbd2_journal_check_available_features
1793 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
1794 printk(KERN_ERR
"EXT4-fs: Journal does not support "
1795 "requested data journaling mode\n");
1802 if (test_opt(sb
, NOBH
)) {
1803 if (!(test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)) {
1804 printk(KERN_WARNING
"EXT4-fs: Ignoring nobh option - "
1805 "its supported only with writeback mode\n");
1806 clear_opt(sbi
->s_mount_opt
, NOBH
);
1810 * The jbd2_journal_load will have done any necessary log recovery,
1811 * so we can safely mount the rest of the filesystem now.
1814 root
= iget(sb
, EXT4_ROOT_INO
);
1815 sb
->s_root
= d_alloc_root(root
);
1817 printk(KERN_ERR
"EXT4-fs: get root inode failed\n");
1821 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
1824 printk(KERN_ERR
"EXT4-fs: corrupt root inode, run e2fsck\n");
1828 ext4_setup_super (sb
, es
, sb
->s_flags
& MS_RDONLY
);
1830 * akpm: core read_super() calls in here with the superblock locked.
1831 * That deadlocks, because orphan cleanup needs to lock the superblock
1832 * in numerous places. Here we just pop the lock - it's relatively
1833 * harmless, because we are now ready to accept write_super() requests,
1834 * and aviro says that's the only reason for hanging onto the
1837 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
1838 ext4_orphan_cleanup(sb
, es
);
1839 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
1841 printk (KERN_INFO
"EXT4-fs: recovery complete.\n");
1842 ext4_mark_recovery_complete(sb
, es
);
1843 printk (KERN_INFO
"EXT4-fs: mounted filesystem with %s data mode.\n",
1844 test_opt(sb
,DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
? "journal":
1845 test_opt(sb
,DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
? "ordered":
1855 printk(KERN_ERR
"VFS: Can't find ext4 filesystem on dev %s.\n",
1860 jbd2_journal_destroy(sbi
->s_journal
);
1862 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
1863 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
1864 percpu_counter_destroy(&sbi
->s_dirs_counter
);
1866 for (i
= 0; i
< db_count
; i
++)
1867 brelse(sbi
->s_group_desc
[i
]);
1868 kfree(sbi
->s_group_desc
);
1871 for (i
= 0; i
< MAXQUOTAS
; i
++)
1872 kfree(sbi
->s_qf_names
[i
]);
1874 ext4_blkdev_remove(sbi
);
1877 sb
->s_fs_info
= NULL
;
1884 * Setup any per-fs journal parameters now. We'll do this both on
1885 * initial mount, once the journal has been initialised but before we've
1886 * done any recovery; and again on any subsequent remount.
1888 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
1890 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1892 if (sbi
->s_commit_interval
)
1893 journal
->j_commit_interval
= sbi
->s_commit_interval
;
1894 /* We could also set up an ext4-specific default for the commit
1895 * interval here, but for now we'll just fall back to the jbd
1898 spin_lock(&journal
->j_state_lock
);
1899 if (test_opt(sb
, BARRIER
))
1900 journal
->j_flags
|= JBD2_BARRIER
;
1902 journal
->j_flags
&= ~JBD2_BARRIER
;
1903 spin_unlock(&journal
->j_state_lock
);
1906 static journal_t
*ext4_get_journal(struct super_block
*sb
,
1907 unsigned int journal_inum
)
1909 struct inode
*journal_inode
;
1912 /* First, test for the existence of a valid inode on disk. Bad
1913 * things happen if we iget() an unused inode, as the subsequent
1914 * iput() will try to delete it. */
1916 journal_inode
= iget(sb
, journal_inum
);
1917 if (!journal_inode
) {
1918 printk(KERN_ERR
"EXT4-fs: no journal found.\n");
1921 if (!journal_inode
->i_nlink
) {
1922 make_bad_inode(journal_inode
);
1923 iput(journal_inode
);
1924 printk(KERN_ERR
"EXT4-fs: journal inode is deleted.\n");
1928 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1929 journal_inode
, journal_inode
->i_size
);
1930 if (is_bad_inode(journal_inode
) || !S_ISREG(journal_inode
->i_mode
)) {
1931 printk(KERN_ERR
"EXT4-fs: invalid journal inode.\n");
1932 iput(journal_inode
);
1936 journal
= jbd2_journal_init_inode(journal_inode
);
1938 printk(KERN_ERR
"EXT4-fs: Could not load journal inode\n");
1939 iput(journal_inode
);
1942 journal
->j_private
= sb
;
1943 ext4_init_journal_params(sb
, journal
);
1947 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
1950 struct buffer_head
* bh
;
1954 int hblock
, blocksize
;
1955 ext4_fsblk_t sb_block
;
1956 unsigned long offset
;
1957 struct ext4_super_block
* es
;
1958 struct block_device
*bdev
;
1960 bdev
= ext4_blkdev_get(j_dev
);
1964 if (bd_claim(bdev
, sb
)) {
1966 "EXT4: failed to claim external journal device.\n");
1971 blocksize
= sb
->s_blocksize
;
1972 hblock
= bdev_hardsect_size(bdev
);
1973 if (blocksize
< hblock
) {
1975 "EXT4-fs: blocksize too small for journal device.\n");
1979 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
1980 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
1981 set_blocksize(bdev
, blocksize
);
1982 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
1983 printk(KERN_ERR
"EXT4-fs: couldn't read superblock of "
1984 "external journal\n");
1988 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
1989 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
1990 !(le32_to_cpu(es
->s_feature_incompat
) &
1991 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
1992 printk(KERN_ERR
"EXT4-fs: external journal has "
1993 "bad superblock\n");
1998 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
1999 printk(KERN_ERR
"EXT4-fs: journal UUID does not match\n");
2004 len
= ext4_blocks_count(es
);
2005 start
= sb_block
+ 1;
2006 brelse(bh
); /* we're done with the superblock */
2008 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
2009 start
, len
, blocksize
);
2011 printk(KERN_ERR
"EXT4-fs: failed to create device journal\n");
2014 journal
->j_private
= sb
;
2015 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
2016 wait_on_buffer(journal
->j_sb_buffer
);
2017 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
2018 printk(KERN_ERR
"EXT4-fs: I/O error on journal device\n");
2021 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
2022 printk(KERN_ERR
"EXT4-fs: External journal has more than one "
2023 "user (unsupported) - %d\n",
2024 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
2027 EXT4_SB(sb
)->journal_bdev
= bdev
;
2028 ext4_init_journal_params(sb
, journal
);
2031 jbd2_journal_destroy(journal
);
2033 ext4_blkdev_put(bdev
);
2037 static int ext4_load_journal(struct super_block
*sb
,
2038 struct ext4_super_block
*es
,
2039 unsigned long journal_devnum
)
2042 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
2045 int really_read_only
;
2047 if (journal_devnum
&&
2048 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
2049 printk(KERN_INFO
"EXT4-fs: external journal device major/minor "
2050 "numbers have changed\n");
2051 journal_dev
= new_decode_dev(journal_devnum
);
2053 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
2055 really_read_only
= bdev_read_only(sb
->s_bdev
);
2058 * Are we loading a blank journal or performing recovery after a
2059 * crash? For recovery, we need to check in advance whether we
2060 * can get read-write access to the device.
2063 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
2064 if (sb
->s_flags
& MS_RDONLY
) {
2065 printk(KERN_INFO
"EXT4-fs: INFO: recovery "
2066 "required on readonly filesystem.\n");
2067 if (really_read_only
) {
2068 printk(KERN_ERR
"EXT4-fs: write access "
2069 "unavailable, cannot proceed.\n");
2072 printk (KERN_INFO
"EXT4-fs: write access will "
2073 "be enabled during recovery.\n");
2077 if (journal_inum
&& journal_dev
) {
2078 printk(KERN_ERR
"EXT4-fs: filesystem has both journal "
2079 "and inode journals!\n");
2084 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
2087 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
2091 if (!really_read_only
&& test_opt(sb
, UPDATE_JOURNAL
)) {
2092 err
= jbd2_journal_update_format(journal
);
2094 printk(KERN_ERR
"EXT4-fs: error updating journal.\n");
2095 jbd2_journal_destroy(journal
);
2100 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
2101 err
= jbd2_journal_wipe(journal
, !really_read_only
);
2103 err
= jbd2_journal_load(journal
);
2106 printk(KERN_ERR
"EXT4-fs: error loading journal.\n");
2107 jbd2_journal_destroy(journal
);
2111 EXT4_SB(sb
)->s_journal
= journal
;
2112 ext4_clear_journal_err(sb
, es
);
2114 if (journal_devnum
&&
2115 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
2116 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
2119 /* Make sure we flush the recovery flag to disk. */
2120 ext4_commit_super(sb
, es
, 1);
2126 static int ext4_create_journal(struct super_block
* sb
,
2127 struct ext4_super_block
* es
,
2128 unsigned int journal_inum
)
2132 if (sb
->s_flags
& MS_RDONLY
) {
2133 printk(KERN_ERR
"EXT4-fs: readonly filesystem when trying to "
2134 "create journal.\n");
2138 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
2141 printk(KERN_INFO
"EXT4-fs: creating new journal on inode %u\n",
2144 if (jbd2_journal_create(journal
)) {
2145 printk(KERN_ERR
"EXT4-fs: error creating journal.\n");
2146 jbd2_journal_destroy(journal
);
2150 EXT4_SB(sb
)->s_journal
= journal
;
2152 ext4_update_dynamic_rev(sb
);
2153 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
2154 EXT4_SET_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
);
2156 es
->s_journal_inum
= cpu_to_le32(journal_inum
);
2159 /* Make sure we flush the recovery flag to disk. */
2160 ext4_commit_super(sb
, es
, 1);
2165 static void ext4_commit_super (struct super_block
* sb
,
2166 struct ext4_super_block
* es
,
2169 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
2173 es
->s_wtime
= cpu_to_le32(get_seconds());
2174 ext4_free_blocks_count_set(es
, ext4_count_free_blocks(sb
));
2175 es
->s_free_inodes_count
= cpu_to_le32(ext4_count_free_inodes(sb
));
2176 BUFFER_TRACE(sbh
, "marking dirty");
2177 mark_buffer_dirty(sbh
);
2179 sync_dirty_buffer(sbh
);
2184 * Have we just finished recovery? If so, and if we are mounting (or
2185 * remounting) the filesystem readonly, then we will end up with a
2186 * consistent fs on disk. Record that fact.
2188 static void ext4_mark_recovery_complete(struct super_block
* sb
,
2189 struct ext4_super_block
* es
)
2191 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
2193 jbd2_journal_lock_updates(journal
);
2194 jbd2_journal_flush(journal
);
2195 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
2196 sb
->s_flags
& MS_RDONLY
) {
2197 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
2199 ext4_commit_super(sb
, es
, 1);
2201 jbd2_journal_unlock_updates(journal
);
2205 * If we are mounting (or read-write remounting) a filesystem whose journal
2206 * has recorded an error from a previous lifetime, move that error to the
2207 * main filesystem now.
2209 static void ext4_clear_journal_err(struct super_block
* sb
,
2210 struct ext4_super_block
* es
)
2216 journal
= EXT4_SB(sb
)->s_journal
;
2219 * Now check for any error status which may have been recorded in the
2220 * journal by a prior ext4_error() or ext4_abort()
2223 j_errno
= jbd2_journal_errno(journal
);
2227 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
2228 ext4_warning(sb
, __FUNCTION__
, "Filesystem error recorded "
2229 "from previous mount: %s", errstr
);
2230 ext4_warning(sb
, __FUNCTION__
, "Marking fs in need of "
2231 "filesystem check.");
2233 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
2234 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
2235 ext4_commit_super (sb
, es
, 1);
2237 jbd2_journal_clear_err(journal
);
2242 * Force the running and committing transactions to commit,
2243 * and wait on the commit.
2245 int ext4_force_commit(struct super_block
*sb
)
2250 if (sb
->s_flags
& MS_RDONLY
)
2253 journal
= EXT4_SB(sb
)->s_journal
;
2255 ret
= ext4_journal_force_commit(journal
);
2260 * Ext4 always journals updates to the superblock itself, so we don't
2261 * have to propagate any other updates to the superblock on disk at this
2262 * point. Just start an async writeback to get the buffers on their way
2265 * This implicitly triggers the writebehind on sync().
2268 static void ext4_write_super (struct super_block
* sb
)
2270 if (mutex_trylock(&sb
->s_lock
) != 0)
2275 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
2280 if (jbd2_journal_start_commit(EXT4_SB(sb
)->s_journal
, &target
)) {
2282 jbd2_log_wait_commit(EXT4_SB(sb
)->s_journal
, target
);
2288 * LVM calls this function before a (read-only) snapshot is created. This
2289 * gives us a chance to flush the journal completely and mark the fs clean.
2291 static void ext4_write_super_lockfs(struct super_block
*sb
)
2295 if (!(sb
->s_flags
& MS_RDONLY
)) {
2296 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
2298 /* Now we set up the journal barrier. */
2299 jbd2_journal_lock_updates(journal
);
2300 jbd2_journal_flush(journal
);
2302 /* Journal blocked and flushed, clear needs_recovery flag. */
2303 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
2304 ext4_commit_super(sb
, EXT4_SB(sb
)->s_es
, 1);
2309 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2310 * flag here, even though the filesystem is not technically dirty yet.
2312 static void ext4_unlockfs(struct super_block
*sb
)
2314 if (!(sb
->s_flags
& MS_RDONLY
)) {
2316 /* Reser the needs_recovery flag before the fs is unlocked. */
2317 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
2318 ext4_commit_super(sb
, EXT4_SB(sb
)->s_es
, 1);
2320 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
2324 static int ext4_remount (struct super_block
* sb
, int * flags
, char * data
)
2326 struct ext4_super_block
* es
;
2327 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2328 ext4_fsblk_t n_blocks_count
= 0;
2329 unsigned long old_sb_flags
;
2330 struct ext4_mount_options old_opts
;
2336 /* Store the original options */
2337 old_sb_flags
= sb
->s_flags
;
2338 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
2339 old_opts
.s_resuid
= sbi
->s_resuid
;
2340 old_opts
.s_resgid
= sbi
->s_resgid
;
2341 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
2343 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
2344 for (i
= 0; i
< MAXQUOTAS
; i
++)
2345 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
2349 * Allow the "check" option to be passed as a remount option.
2351 if (!parse_options(data
, sb
, NULL
, NULL
, &n_blocks_count
, 1)) {
2356 if (sbi
->s_mount_opt
& EXT4_MOUNT_ABORT
)
2357 ext4_abort(sb
, __FUNCTION__
, "Abort forced by user");
2359 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
2360 ((sbi
->s_mount_opt
& EXT4_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
2364 ext4_init_journal_params(sb
, sbi
->s_journal
);
2366 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
) ||
2367 n_blocks_count
> ext4_blocks_count(es
)) {
2368 if (sbi
->s_mount_opt
& EXT4_MOUNT_ABORT
) {
2373 if (*flags
& MS_RDONLY
) {
2375 * First of all, the unconditional stuff we have to do
2376 * to disable replay of the journal when we next remount
2378 sb
->s_flags
|= MS_RDONLY
;
2381 * OK, test if we are remounting a valid rw partition
2382 * readonly, and if so set the rdonly flag and then
2383 * mark the partition as valid again.
2385 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
2386 (sbi
->s_mount_state
& EXT4_VALID_FS
))
2387 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
2389 ext4_mark_recovery_complete(sb
, es
);
2392 if ((ret
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2393 ~EXT4_FEATURE_RO_COMPAT_SUPP
))) {
2394 printk(KERN_WARNING
"EXT4-fs: %s: couldn't "
2395 "remount RDWR because of unsupported "
2396 "optional features (%x).\n",
2397 sb
->s_id
, le32_to_cpu(ret
));
2402 * Mounting a RDONLY partition read-write, so reread
2403 * and store the current valid flag. (It may have
2404 * been changed by e2fsck since we originally mounted
2407 ext4_clear_journal_err(sb
, es
);
2408 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
2409 if ((err
= ext4_group_extend(sb
, es
, n_blocks_count
)))
2411 if (!ext4_setup_super (sb
, es
, 0))
2412 sb
->s_flags
&= ~MS_RDONLY
;
2416 /* Release old quota file names */
2417 for (i
= 0; i
< MAXQUOTAS
; i
++)
2418 if (old_opts
.s_qf_names
[i
] &&
2419 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
2420 kfree(old_opts
.s_qf_names
[i
]);
2424 sb
->s_flags
= old_sb_flags
;
2425 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
2426 sbi
->s_resuid
= old_opts
.s_resuid
;
2427 sbi
->s_resgid
= old_opts
.s_resgid
;
2428 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
2430 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
2431 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2432 if (sbi
->s_qf_names
[i
] &&
2433 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
2434 kfree(sbi
->s_qf_names
[i
]);
2435 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
2441 static int ext4_statfs (struct dentry
* dentry
, struct kstatfs
* buf
)
2443 struct super_block
*sb
= dentry
->d_sb
;
2444 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2445 struct ext4_super_block
*es
= sbi
->s_es
;
2446 ext4_fsblk_t overhead
;
2449 if (test_opt (sb
, MINIX_DF
))
2452 unsigned long ngroups
;
2453 ngroups
= EXT4_SB(sb
)->s_groups_count
;
2457 * Compute the overhead (FS structures)
2461 * All of the blocks before first_data_block are
2464 overhead
= le32_to_cpu(es
->s_first_data_block
);
2467 * Add the overhead attributed to the superblock and
2468 * block group descriptors. If the sparse superblocks
2469 * feature is turned on, then not all groups have this.
2471 for (i
= 0; i
< ngroups
; i
++) {
2472 overhead
+= ext4_bg_has_super(sb
, i
) +
2473 ext4_bg_num_gdb(sb
, i
);
2478 * Every block group has an inode bitmap, a block
2479 * bitmap, and an inode table.
2481 overhead
+= (ngroups
* (2 + EXT4_SB(sb
)->s_itb_per_group
));
2484 buf
->f_type
= EXT4_SUPER_MAGIC
;
2485 buf
->f_bsize
= sb
->s_blocksize
;
2486 buf
->f_blocks
= ext4_blocks_count(es
) - overhead
;
2487 buf
->f_bfree
= percpu_counter_sum(&sbi
->s_freeblocks_counter
);
2488 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
2489 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
2491 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
2492 buf
->f_ffree
= percpu_counter_sum(&sbi
->s_freeinodes_counter
);
2493 buf
->f_namelen
= EXT4_NAME_LEN
;
2497 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2498 * is locked for write. Otherwise the are possible deadlocks:
2499 * Process 1 Process 2
2500 * ext4_create() quota_sync()
2501 * jbd2_journal_start() write_dquot()
2502 * DQUOT_INIT() down(dqio_mutex)
2503 * down(dqio_mutex) jbd2_journal_start()
2509 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
2511 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_type
];
2514 static int ext4_dquot_initialize(struct inode
*inode
, int type
)
2519 /* We may create quota structure so we need to reserve enough blocks */
2520 handle
= ext4_journal_start(inode
, 2*EXT4_QUOTA_INIT_BLOCKS(inode
->i_sb
));
2522 return PTR_ERR(handle
);
2523 ret
= dquot_initialize(inode
, type
);
2524 err
= ext4_journal_stop(handle
);
2530 static int ext4_dquot_drop(struct inode
*inode
)
2535 /* We may delete quota structure so we need to reserve enough blocks */
2536 handle
= ext4_journal_start(inode
, 2*EXT4_QUOTA_DEL_BLOCKS(inode
->i_sb
));
2538 return PTR_ERR(handle
);
2539 ret
= dquot_drop(inode
);
2540 err
= ext4_journal_stop(handle
);
2546 static int ext4_write_dquot(struct dquot
*dquot
)
2550 struct inode
*inode
;
2552 inode
= dquot_to_inode(dquot
);
2553 handle
= ext4_journal_start(inode
,
2554 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
2556 return PTR_ERR(handle
);
2557 ret
= dquot_commit(dquot
);
2558 err
= ext4_journal_stop(handle
);
2564 static int ext4_acquire_dquot(struct dquot
*dquot
)
2569 handle
= ext4_journal_start(dquot_to_inode(dquot
),
2570 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
2572 return PTR_ERR(handle
);
2573 ret
= dquot_acquire(dquot
);
2574 err
= ext4_journal_stop(handle
);
2580 static int ext4_release_dquot(struct dquot
*dquot
)
2585 handle
= ext4_journal_start(dquot_to_inode(dquot
),
2586 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
2588 return PTR_ERR(handle
);
2589 ret
= dquot_release(dquot
);
2590 err
= ext4_journal_stop(handle
);
2596 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
2598 /* Are we journalling quotas? */
2599 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
2600 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
2601 dquot_mark_dquot_dirty(dquot
);
2602 return ext4_write_dquot(dquot
);
2604 return dquot_mark_dquot_dirty(dquot
);
2608 static int ext4_write_info(struct super_block
*sb
, int type
)
2613 /* Data block + inode block */
2614 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
2616 return PTR_ERR(handle
);
2617 ret
= dquot_commit_info(sb
, type
);
2618 err
= ext4_journal_stop(handle
);
2625 * Turn on quotas during mount time - we need to find
2626 * the quota file and such...
2628 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
2630 return vfs_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
2631 EXT4_SB(sb
)->s_jquota_fmt
, type
);
2635 * Standard function to be called on quota_on
2637 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
2641 struct nameidata nd
;
2643 if (!test_opt(sb
, QUOTA
))
2645 /* Not journalling quota? */
2646 if (!EXT4_SB(sb
)->s_qf_names
[USRQUOTA
] &&
2647 !EXT4_SB(sb
)->s_qf_names
[GRPQUOTA
])
2648 return vfs_quota_on(sb
, type
, format_id
, path
);
2649 err
= path_lookup(path
, LOOKUP_FOLLOW
, &nd
);
2652 /* Quotafile not on the same filesystem? */
2653 if (nd
.mnt
->mnt_sb
!= sb
) {
2657 /* Quotafile not of fs root? */
2658 if (nd
.dentry
->d_parent
->d_inode
!= sb
->s_root
->d_inode
)
2660 "EXT4-fs: Quota file not on filesystem root. "
2661 "Journalled quota will not work.\n");
2663 return vfs_quota_on(sb
, type
, format_id
, path
);
2666 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2667 * acquiring the locks... As quota files are never truncated and quota code
2668 * itself serializes the operations (and noone else should touch the files)
2669 * we don't have to be afraid of races */
2670 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
2671 size_t len
, loff_t off
)
2673 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
2674 sector_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
2676 int offset
= off
& (sb
->s_blocksize
- 1);
2679 struct buffer_head
*bh
;
2680 loff_t i_size
= i_size_read(inode
);
2684 if (off
+len
> i_size
)
2687 while (toread
> 0) {
2688 tocopy
= sb
->s_blocksize
- offset
< toread
?
2689 sb
->s_blocksize
- offset
: toread
;
2690 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
2693 if (!bh
) /* A hole? */
2694 memset(data
, 0, tocopy
);
2696 memcpy(data
, bh
->b_data
+offset
, tocopy
);
2706 /* Write to quotafile (we know the transaction is already started and has
2707 * enough credits) */
2708 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
2709 const char *data
, size_t len
, loff_t off
)
2711 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
2712 sector_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
2714 int offset
= off
& (sb
->s_blocksize
- 1);
2716 int journal_quota
= EXT4_SB(sb
)->s_qf_names
[type
] != NULL
;
2717 size_t towrite
= len
;
2718 struct buffer_head
*bh
;
2719 handle_t
*handle
= journal_current_handle();
2721 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
2722 while (towrite
> 0) {
2723 tocopy
= sb
->s_blocksize
- offset
< towrite
?
2724 sb
->s_blocksize
- offset
: towrite
;
2725 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
2728 if (journal_quota
) {
2729 err
= ext4_journal_get_write_access(handle
, bh
);
2736 memcpy(bh
->b_data
+offset
, data
, tocopy
);
2737 flush_dcache_page(bh
->b_page
);
2740 err
= ext4_journal_dirty_metadata(handle
, bh
);
2742 /* Always do at least ordered writes for quotas */
2743 err
= ext4_journal_dirty_data(handle
, bh
);
2744 mark_buffer_dirty(bh
);
2757 if (inode
->i_size
< off
+len
-towrite
) {
2758 i_size_write(inode
, off
+len
-towrite
);
2759 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
2762 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
2763 ext4_mark_inode_dirty(handle
, inode
);
2764 mutex_unlock(&inode
->i_mutex
);
2765 return len
- towrite
;
2770 static int ext4_get_sb(struct file_system_type
*fs_type
,
2771 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
2773 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
, mnt
);
2776 static struct file_system_type ext4dev_fs_type
= {
2777 .owner
= THIS_MODULE
,
2779 .get_sb
= ext4_get_sb
,
2780 .kill_sb
= kill_block_super
,
2781 .fs_flags
= FS_REQUIRES_DEV
,
2784 static int __init
init_ext4_fs(void)
2786 int err
= init_ext4_xattr();
2789 err
= init_inodecache();
2792 err
= register_filesystem(&ext4dev_fs_type
);
2797 destroy_inodecache();
2803 static void __exit
exit_ext4_fs(void)
2805 unregister_filesystem(&ext4dev_fs_type
);
2806 destroy_inodecache();
2810 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2811 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
2812 MODULE_LICENSE("GPL");
2813 module_init(init_ext4_fs
)
2814 module_exit(exit_ext4_fs
)