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 super_block
*sb
,
67 struct ext4_group_desc
*bg
)
69 return le32_to_cpu(bg
->bg_block_bitmap
) |
70 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
71 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
74 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
75 struct ext4_group_desc
*bg
)
77 return le32_to_cpu(bg
->bg_inode_bitmap
) |
78 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
79 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
82 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
83 struct ext4_group_desc
*bg
)
85 return le32_to_cpu(bg
->bg_inode_table
) |
86 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
87 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
90 void ext4_block_bitmap_set(struct super_block
*sb
,
91 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
93 bg
->bg_block_bitmap
= cpu_to_le32((u32
)blk
);
94 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
95 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
98 void ext4_inode_bitmap_set(struct super_block
*sb
,
99 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
101 bg
->bg_inode_bitmap
= cpu_to_le32((u32
)blk
);
102 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
103 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
106 void ext4_inode_table_set(struct super_block
*sb
,
107 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
109 bg
->bg_inode_table
= cpu_to_le32((u32
)blk
);
110 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
111 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
115 * Wrappers for jbd2_journal_start/end.
117 * The only special thing we need to do here is to make sure that all
118 * journal_end calls result in the superblock being marked dirty, so
119 * that sync() will call the filesystem's write_super callback if
122 handle_t
*ext4_journal_start_sb(struct super_block
*sb
, int nblocks
)
126 if (sb
->s_flags
& MS_RDONLY
)
127 return ERR_PTR(-EROFS
);
129 /* Special case here: if the journal has aborted behind our
130 * backs (eg. EIO in the commit thread), then we still need to
131 * take the FS itself readonly cleanly. */
132 journal
= EXT4_SB(sb
)->s_journal
;
133 if (is_journal_aborted(journal
)) {
134 ext4_abort(sb
, __FUNCTION__
,
135 "Detected aborted journal");
136 return ERR_PTR(-EROFS
);
139 return jbd2_journal_start(journal
, nblocks
);
143 * The only special thing we need to do here is to make sure that all
144 * jbd2_journal_stop calls result in the superblock being marked dirty, so
145 * that sync() will call the filesystem's write_super callback if
148 int __ext4_journal_stop(const char *where
, handle_t
*handle
)
150 struct super_block
*sb
;
154 sb
= handle
->h_transaction
->t_journal
->j_private
;
156 rc
= jbd2_journal_stop(handle
);
161 __ext4_std_error(sb
, where
, err
);
165 void ext4_journal_abort_handle(const char *caller
, const char *err_fn
,
166 struct buffer_head
*bh
, handle_t
*handle
, int err
)
169 const char *errstr
= ext4_decode_error(NULL
, err
, nbuf
);
172 BUFFER_TRACE(bh
, "abort");
177 if (is_handle_aborted(handle
))
180 printk(KERN_ERR
"%s: aborting transaction: %s in %s\n",
181 caller
, errstr
, err_fn
);
183 jbd2_journal_abort_handle(handle
);
186 /* Deal with the reporting of failure conditions on a filesystem such as
187 * inconsistencies detected or read IO failures.
189 * On ext2, we can store the error state of the filesystem in the
190 * superblock. That is not possible on ext4, because we may have other
191 * write ordering constraints on the superblock which prevent us from
192 * writing it out straight away; and given that the journal is about to
193 * be aborted, we can't rely on the current, or future, transactions to
194 * write out the superblock safely.
196 * We'll just use the jbd2_journal_abort() error code to record an error in
197 * the journal instead. On recovery, the journal will compain about
198 * that error until we've noted it down and cleared it.
201 static void ext4_handle_error(struct super_block
*sb
)
203 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
205 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
206 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
208 if (sb
->s_flags
& MS_RDONLY
)
211 if (!test_opt (sb
, ERRORS_CONT
)) {
212 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
214 EXT4_SB(sb
)->s_mount_opt
|= EXT4_MOUNT_ABORT
;
216 jbd2_journal_abort(journal
, -EIO
);
218 if (test_opt (sb
, ERRORS_RO
)) {
219 printk (KERN_CRIT
"Remounting filesystem read-only\n");
220 sb
->s_flags
|= MS_RDONLY
;
222 ext4_commit_super(sb
, es
, 1);
223 if (test_opt(sb
, ERRORS_PANIC
))
224 panic("EXT4-fs (device %s): panic forced after error\n",
228 void ext4_error (struct super_block
* sb
, const char * function
,
229 const char * fmt
, ...)
234 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ",sb
->s_id
, function
);
239 ext4_handle_error(sb
);
242 static const char *ext4_decode_error(struct super_block
* sb
, int errno
,
249 errstr
= "IO failure";
252 errstr
= "Out of memory";
255 if (!sb
|| EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
)
256 errstr
= "Journal has aborted";
258 errstr
= "Readonly filesystem";
261 /* If the caller passed in an extra buffer for unknown
262 * errors, textualise them now. Else we just return
265 /* Check for truncated error codes... */
266 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
275 /* __ext4_std_error decodes expected errors from journaling functions
276 * automatically and invokes the appropriate error response. */
278 void __ext4_std_error (struct super_block
* sb
, const char * function
,
284 /* Special case: if the error is EROFS, and we're not already
285 * inside a transaction, then there's really no point in logging
287 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
288 (sb
->s_flags
& MS_RDONLY
))
291 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
292 printk (KERN_CRIT
"EXT4-fs error (device %s) in %s: %s\n",
293 sb
->s_id
, function
, errstr
);
295 ext4_handle_error(sb
);
299 * ext4_abort is a much stronger failure handler than ext4_error. The
300 * abort function may be used to deal with unrecoverable failures such
301 * as journal IO errors or ENOMEM at a critical moment in log management.
303 * We unconditionally force the filesystem into an ABORT|READONLY state,
304 * unless the error response on the fs has been set to panic in which
305 * case we take the easy way out and panic immediately.
308 void ext4_abort (struct super_block
* sb
, const char * function
,
309 const char * fmt
, ...)
313 printk (KERN_CRIT
"ext4_abort called.\n");
316 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ",sb
->s_id
, function
);
321 if (test_opt(sb
, ERRORS_PANIC
))
322 panic("EXT4-fs panic from previous error\n");
324 if (sb
->s_flags
& MS_RDONLY
)
327 printk(KERN_CRIT
"Remounting filesystem read-only\n");
328 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
329 sb
->s_flags
|= MS_RDONLY
;
330 EXT4_SB(sb
)->s_mount_opt
|= EXT4_MOUNT_ABORT
;
331 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
334 void ext4_warning (struct super_block
* sb
, const char * function
,
335 const char * fmt
, ...)
340 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s: ",
347 void ext4_update_dynamic_rev(struct super_block
*sb
)
349 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
351 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
354 ext4_warning(sb
, __FUNCTION__
,
355 "updating to rev %d because of new feature flag, "
356 "running e2fsck is recommended",
359 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
360 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
361 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
362 /* leave es->s_feature_*compat flags alone */
363 /* es->s_uuid will be set by e2fsck if empty */
366 * The rest of the superblock fields should be zero, and if not it
367 * means they are likely already in use, so leave them alone. We
368 * can leave it up to e2fsck to clean up any inconsistencies there.
373 * Open the external journal device
375 static struct block_device
*ext4_blkdev_get(dev_t dev
)
377 struct block_device
*bdev
;
378 char b
[BDEVNAME_SIZE
];
380 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
386 printk(KERN_ERR
"EXT4: failed to open journal device %s: %ld\n",
387 __bdevname(dev
, b
), PTR_ERR(bdev
));
392 * Release the journal device
394 static int ext4_blkdev_put(struct block_device
*bdev
)
397 return blkdev_put(bdev
);
400 static int ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
402 struct block_device
*bdev
;
405 bdev
= sbi
->journal_bdev
;
407 ret
= ext4_blkdev_put(bdev
);
408 sbi
->journal_bdev
= NULL
;
413 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
415 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
418 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
422 printk(KERN_ERR
"sb orphan head is %d\n",
423 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
425 printk(KERN_ERR
"sb_info orphan list:\n");
426 list_for_each(l
, &sbi
->s_orphan
) {
427 struct inode
*inode
= orphan_list_entry(l
);
429 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
430 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
431 inode
->i_mode
, inode
->i_nlink
,
436 static void ext4_put_super (struct super_block
* sb
)
438 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
439 struct ext4_super_block
*es
= sbi
->s_es
;
442 ext4_ext_release(sb
);
443 ext4_xattr_put_super(sb
);
444 jbd2_journal_destroy(sbi
->s_journal
);
445 if (!(sb
->s_flags
& MS_RDONLY
)) {
446 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
447 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
448 BUFFER_TRACE(sbi
->s_sbh
, "marking dirty");
449 mark_buffer_dirty(sbi
->s_sbh
);
450 ext4_commit_super(sb
, es
, 1);
453 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
454 brelse(sbi
->s_group_desc
[i
]);
455 kfree(sbi
->s_group_desc
);
456 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
457 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
458 percpu_counter_destroy(&sbi
->s_dirs_counter
);
461 for (i
= 0; i
< MAXQUOTAS
; i
++)
462 kfree(sbi
->s_qf_names
[i
]);
465 /* Debugging code just in case the in-memory inode orphan list
466 * isn't empty. The on-disk one can be non-empty if we've
467 * detected an error and taken the fs readonly, but the
468 * in-memory list had better be clean by this point. */
469 if (!list_empty(&sbi
->s_orphan
))
470 dump_orphan_list(sb
, sbi
);
471 J_ASSERT(list_empty(&sbi
->s_orphan
));
473 invalidate_bdev(sb
->s_bdev
);
474 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
476 * Invalidate the journal device's buffers. We don't want them
477 * floating about in memory - the physical journal device may
478 * hotswapped, and it breaks the `ro-after' testing code.
480 sync_blockdev(sbi
->journal_bdev
);
481 invalidate_bdev(sbi
->journal_bdev
);
482 ext4_blkdev_remove(sbi
);
484 sb
->s_fs_info
= NULL
;
489 static struct kmem_cache
*ext4_inode_cachep
;
492 * Called inside transaction, so use GFP_NOFS
494 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
496 struct ext4_inode_info
*ei
;
498 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
501 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
502 ei
->i_acl
= EXT4_ACL_NOT_CACHED
;
503 ei
->i_default_acl
= EXT4_ACL_NOT_CACHED
;
505 ei
->i_block_alloc_info
= NULL
;
506 ei
->vfs_inode
.i_version
= 1;
507 memset(&ei
->i_cached_extent
, 0, sizeof(struct ext4_ext_cache
));
508 return &ei
->vfs_inode
;
511 static void ext4_destroy_inode(struct inode
*inode
)
513 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
514 printk("EXT4 Inode %p: orphan list check failed!\n",
516 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
517 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
521 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
524 static void init_once(void * foo
, struct kmem_cache
* cachep
, unsigned long flags
)
526 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
528 INIT_LIST_HEAD(&ei
->i_orphan
);
529 #ifdef CONFIG_EXT4DEV_FS_XATTR
530 init_rwsem(&ei
->xattr_sem
);
532 mutex_init(&ei
->truncate_mutex
);
533 inode_init_once(&ei
->vfs_inode
);
536 static int init_inodecache(void)
538 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
539 sizeof(struct ext4_inode_info
),
540 0, (SLAB_RECLAIM_ACCOUNT
|
543 if (ext4_inode_cachep
== NULL
)
548 static void destroy_inodecache(void)
550 kmem_cache_destroy(ext4_inode_cachep
);
553 static void ext4_clear_inode(struct inode
*inode
)
555 struct ext4_block_alloc_info
*rsv
= EXT4_I(inode
)->i_block_alloc_info
;
556 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
557 if (EXT4_I(inode
)->i_acl
&&
558 EXT4_I(inode
)->i_acl
!= EXT4_ACL_NOT_CACHED
) {
559 posix_acl_release(EXT4_I(inode
)->i_acl
);
560 EXT4_I(inode
)->i_acl
= EXT4_ACL_NOT_CACHED
;
562 if (EXT4_I(inode
)->i_default_acl
&&
563 EXT4_I(inode
)->i_default_acl
!= EXT4_ACL_NOT_CACHED
) {
564 posix_acl_release(EXT4_I(inode
)->i_default_acl
);
565 EXT4_I(inode
)->i_default_acl
= EXT4_ACL_NOT_CACHED
;
568 ext4_discard_reservation(inode
);
569 EXT4_I(inode
)->i_block_alloc_info
= NULL
;
574 static inline void ext4_show_quota_options(struct seq_file
*seq
, struct super_block
*sb
)
576 #if defined(CONFIG_QUOTA)
577 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
579 if (sbi
->s_jquota_fmt
)
580 seq_printf(seq
, ",jqfmt=%s",
581 (sbi
->s_jquota_fmt
== QFMT_VFS_OLD
) ? "vfsold": "vfsv0");
583 if (sbi
->s_qf_names
[USRQUOTA
])
584 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
586 if (sbi
->s_qf_names
[GRPQUOTA
])
587 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
589 if (sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
)
590 seq_puts(seq
, ",usrquota");
592 if (sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
)
593 seq_puts(seq
, ",grpquota");
597 static int ext4_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
599 struct super_block
*sb
= vfs
->mnt_sb
;
601 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
602 seq_puts(seq
, ",data=journal");
603 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
604 seq_puts(seq
, ",data=ordered");
605 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
606 seq_puts(seq
, ",data=writeback");
608 ext4_show_quota_options(seq
, sb
);
614 static struct dentry
*ext4_get_dentry(struct super_block
*sb
, void *vobjp
)
617 unsigned long ino
= objp
[0];
618 __u32 generation
= objp
[1];
620 struct dentry
*result
;
622 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
623 return ERR_PTR(-ESTALE
);
624 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
625 return ERR_PTR(-ESTALE
);
627 /* iget isn't really right if the inode is currently unallocated!!
629 * ext4_read_inode will return a bad_inode if the inode had been
630 * deleted, so we should be safe.
632 * Currently we don't know the generation for parent directory, so
633 * a generation of 0 means "accept any"
635 inode
= iget(sb
, ino
);
637 return ERR_PTR(-ENOMEM
);
638 if (is_bad_inode(inode
) ||
639 (generation
&& inode
->i_generation
!= generation
)) {
641 return ERR_PTR(-ESTALE
);
643 /* now to find a dentry.
644 * If possible, get a well-connected one
646 result
= d_alloc_anon(inode
);
649 return ERR_PTR(-ENOMEM
);
655 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
656 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
658 static int ext4_dquot_initialize(struct inode
*inode
, int type
);
659 static int ext4_dquot_drop(struct inode
*inode
);
660 static int ext4_write_dquot(struct dquot
*dquot
);
661 static int ext4_acquire_dquot(struct dquot
*dquot
);
662 static int ext4_release_dquot(struct dquot
*dquot
);
663 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
664 static int ext4_write_info(struct super_block
*sb
, int type
);
665 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
, char *path
);
666 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
667 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
668 size_t len
, loff_t off
);
669 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
670 const char *data
, size_t len
, loff_t off
);
672 static struct dquot_operations ext4_quota_operations
= {
673 .initialize
= ext4_dquot_initialize
,
674 .drop
= ext4_dquot_drop
,
675 .alloc_space
= dquot_alloc_space
,
676 .alloc_inode
= dquot_alloc_inode
,
677 .free_space
= dquot_free_space
,
678 .free_inode
= dquot_free_inode
,
679 .transfer
= dquot_transfer
,
680 .write_dquot
= ext4_write_dquot
,
681 .acquire_dquot
= ext4_acquire_dquot
,
682 .release_dquot
= ext4_release_dquot
,
683 .mark_dirty
= ext4_mark_dquot_dirty
,
684 .write_info
= ext4_write_info
687 static struct quotactl_ops ext4_qctl_operations
= {
688 .quota_on
= ext4_quota_on
,
689 .quota_off
= vfs_quota_off
,
690 .quota_sync
= vfs_quota_sync
,
691 .get_info
= vfs_get_dqinfo
,
692 .set_info
= vfs_set_dqinfo
,
693 .get_dqblk
= vfs_get_dqblk
,
694 .set_dqblk
= vfs_set_dqblk
698 static const struct super_operations ext4_sops
= {
699 .alloc_inode
= ext4_alloc_inode
,
700 .destroy_inode
= ext4_destroy_inode
,
701 .read_inode
= ext4_read_inode
,
702 .write_inode
= ext4_write_inode
,
703 .dirty_inode
= ext4_dirty_inode
,
704 .delete_inode
= ext4_delete_inode
,
705 .put_super
= ext4_put_super
,
706 .write_super
= ext4_write_super
,
707 .sync_fs
= ext4_sync_fs
,
708 .write_super_lockfs
= ext4_write_super_lockfs
,
709 .unlockfs
= ext4_unlockfs
,
710 .statfs
= ext4_statfs
,
711 .remount_fs
= ext4_remount
,
712 .clear_inode
= ext4_clear_inode
,
713 .show_options
= ext4_show_options
,
715 .quota_read
= ext4_quota_read
,
716 .quota_write
= ext4_quota_write
,
720 static struct export_operations ext4_export_ops
= {
721 .get_parent
= ext4_get_parent
,
722 .get_dentry
= ext4_get_dentry
,
726 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
727 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
728 Opt_nouid32
, Opt_nocheck
, Opt_debug
, Opt_oldalloc
, Opt_orlov
,
729 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
730 Opt_reservation
, Opt_noreservation
, Opt_noload
, Opt_nobh
, Opt_bh
,
731 Opt_commit
, Opt_journal_update
, Opt_journal_inum
, Opt_journal_dev
,
732 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
733 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
734 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_quota
, Opt_noquota
,
735 Opt_ignore
, Opt_barrier
, Opt_err
, Opt_resize
, Opt_usrquota
,
736 Opt_grpquota
, Opt_extents
,
739 static match_table_t tokens
= {
740 {Opt_bsd_df
, "bsddf"},
741 {Opt_minix_df
, "minixdf"},
742 {Opt_grpid
, "grpid"},
743 {Opt_grpid
, "bsdgroups"},
744 {Opt_nogrpid
, "nogrpid"},
745 {Opt_nogrpid
, "sysvgroups"},
746 {Opt_resgid
, "resgid=%u"},
747 {Opt_resuid
, "resuid=%u"},
749 {Opt_err_cont
, "errors=continue"},
750 {Opt_err_panic
, "errors=panic"},
751 {Opt_err_ro
, "errors=remount-ro"},
752 {Opt_nouid32
, "nouid32"},
753 {Opt_nocheck
, "nocheck"},
754 {Opt_nocheck
, "check=none"},
755 {Opt_debug
, "debug"},
756 {Opt_oldalloc
, "oldalloc"},
757 {Opt_orlov
, "orlov"},
758 {Opt_user_xattr
, "user_xattr"},
759 {Opt_nouser_xattr
, "nouser_xattr"},
761 {Opt_noacl
, "noacl"},
762 {Opt_reservation
, "reservation"},
763 {Opt_noreservation
, "noreservation"},
764 {Opt_noload
, "noload"},
767 {Opt_commit
, "commit=%u"},
768 {Opt_journal_update
, "journal=update"},
769 {Opt_journal_inum
, "journal=%u"},
770 {Opt_journal_dev
, "journal_dev=%u"},
771 {Opt_abort
, "abort"},
772 {Opt_data_journal
, "data=journal"},
773 {Opt_data_ordered
, "data=ordered"},
774 {Opt_data_writeback
, "data=writeback"},
775 {Opt_offusrjquota
, "usrjquota="},
776 {Opt_usrjquota
, "usrjquota=%s"},
777 {Opt_offgrpjquota
, "grpjquota="},
778 {Opt_grpjquota
, "grpjquota=%s"},
779 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
780 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
781 {Opt_grpquota
, "grpquota"},
782 {Opt_noquota
, "noquota"},
783 {Opt_quota
, "quota"},
784 {Opt_usrquota
, "usrquota"},
785 {Opt_barrier
, "barrier=%u"},
786 {Opt_extents
, "extents"},
788 {Opt_resize
, "resize"},
791 static ext4_fsblk_t
get_sb_block(void **data
)
793 ext4_fsblk_t sb_block
;
794 char *options
= (char *) *data
;
796 if (!options
|| strncmp(options
, "sb=", 3) != 0)
797 return 1; /* Default location */
799 /*todo: use simple_strtoll with >32bit ext4 */
800 sb_block
= simple_strtoul(options
, &options
, 0);
801 if (*options
&& *options
!= ',') {
802 printk("EXT4-fs: Invalid sb specification: %s\n",
808 *data
= (void *) options
;
812 static int parse_options (char *options
, struct super_block
*sb
,
813 unsigned int *inum
, unsigned long *journal_devnum
,
814 ext4_fsblk_t
*n_blocks_count
, int is_remount
)
816 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
818 substring_t args
[MAX_OPT_ARGS
];
829 while ((p
= strsep (&options
, ",")) != NULL
) {
834 token
= match_token(p
, tokens
, args
);
837 clear_opt (sbi
->s_mount_opt
, MINIX_DF
);
840 set_opt (sbi
->s_mount_opt
, MINIX_DF
);
843 set_opt (sbi
->s_mount_opt
, GRPID
);
846 clear_opt (sbi
->s_mount_opt
, GRPID
);
849 if (match_int(&args
[0], &option
))
851 sbi
->s_resuid
= option
;
854 if (match_int(&args
[0], &option
))
856 sbi
->s_resgid
= option
;
859 /* handled by get_sb_block() instead of here */
860 /* *sb_block = match_int(&args[0]); */
863 clear_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
864 clear_opt (sbi
->s_mount_opt
, ERRORS_RO
);
865 set_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
868 clear_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
869 clear_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
870 set_opt (sbi
->s_mount_opt
, ERRORS_RO
);
873 clear_opt (sbi
->s_mount_opt
, ERRORS_RO
);
874 clear_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
875 set_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
878 set_opt (sbi
->s_mount_opt
, NO_UID32
);
881 clear_opt (sbi
->s_mount_opt
, CHECK
);
884 set_opt (sbi
->s_mount_opt
, DEBUG
);
887 set_opt (sbi
->s_mount_opt
, OLDALLOC
);
890 clear_opt (sbi
->s_mount_opt
, OLDALLOC
);
892 #ifdef CONFIG_EXT4DEV_FS_XATTR
894 set_opt (sbi
->s_mount_opt
, XATTR_USER
);
896 case Opt_nouser_xattr
:
897 clear_opt (sbi
->s_mount_opt
, XATTR_USER
);
901 case Opt_nouser_xattr
:
902 printk("EXT4 (no)user_xattr options not supported\n");
905 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
907 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
910 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
915 printk("EXT4 (no)acl options not supported\n");
918 case Opt_reservation
:
919 set_opt(sbi
->s_mount_opt
, RESERVATION
);
921 case Opt_noreservation
:
922 clear_opt(sbi
->s_mount_opt
, RESERVATION
);
924 case Opt_journal_update
:
926 /* Eventually we will want to be able to create
927 a journal file here. For now, only allow the
928 user to specify an existing inode to be the
931 printk(KERN_ERR
"EXT4-fs: cannot specify "
932 "journal on remount\n");
935 set_opt (sbi
->s_mount_opt
, UPDATE_JOURNAL
);
937 case Opt_journal_inum
:
939 printk(KERN_ERR
"EXT4-fs: cannot specify "
940 "journal on remount\n");
943 if (match_int(&args
[0], &option
))
947 case Opt_journal_dev
:
949 printk(KERN_ERR
"EXT4-fs: cannot specify "
950 "journal on remount\n");
953 if (match_int(&args
[0], &option
))
955 *journal_devnum
= option
;
958 set_opt (sbi
->s_mount_opt
, NOLOAD
);
961 if (match_int(&args
[0], &option
))
966 option
= JBD_DEFAULT_MAX_COMMIT_AGE
;
967 sbi
->s_commit_interval
= HZ
* option
;
969 case Opt_data_journal
:
970 data_opt
= EXT4_MOUNT_JOURNAL_DATA
;
972 case Opt_data_ordered
:
973 data_opt
= EXT4_MOUNT_ORDERED_DATA
;
975 case Opt_data_writeback
:
976 data_opt
= EXT4_MOUNT_WRITEBACK_DATA
;
979 if ((sbi
->s_mount_opt
& EXT4_MOUNT_DATA_FLAGS
)
982 "EXT4-fs: cannot change data "
983 "mode on remount\n");
987 sbi
->s_mount_opt
&= ~EXT4_MOUNT_DATA_FLAGS
;
988 sbi
->s_mount_opt
|= data_opt
;
998 if (sb_any_quota_enabled(sb
)) {
1000 "EXT4-fs: Cannot change journalled "
1001 "quota options when quota turned on.\n");
1004 qname
= match_strdup(&args
[0]);
1007 "EXT4-fs: not enough memory for "
1008 "storing quotafile name.\n");
1011 if (sbi
->s_qf_names
[qtype
] &&
1012 strcmp(sbi
->s_qf_names
[qtype
], qname
)) {
1014 "EXT4-fs: %s quota file already "
1015 "specified.\n", QTYPE2NAME(qtype
));
1019 sbi
->s_qf_names
[qtype
] = qname
;
1020 if (strchr(sbi
->s_qf_names
[qtype
], '/')) {
1022 "EXT4-fs: quotafile must be on "
1023 "filesystem root.\n");
1024 kfree(sbi
->s_qf_names
[qtype
]);
1025 sbi
->s_qf_names
[qtype
] = NULL
;
1028 set_opt(sbi
->s_mount_opt
, QUOTA
);
1030 case Opt_offusrjquota
:
1033 case Opt_offgrpjquota
:
1036 if (sb_any_quota_enabled(sb
)) {
1037 printk(KERN_ERR
"EXT4-fs: Cannot change "
1038 "journalled quota options when "
1039 "quota turned on.\n");
1043 * The space will be released later when all options
1044 * are confirmed to be correct
1046 sbi
->s_qf_names
[qtype
] = NULL
;
1048 case Opt_jqfmt_vfsold
:
1049 sbi
->s_jquota_fmt
= QFMT_VFS_OLD
;
1051 case Opt_jqfmt_vfsv0
:
1052 sbi
->s_jquota_fmt
= QFMT_VFS_V0
;
1056 set_opt(sbi
->s_mount_opt
, QUOTA
);
1057 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
1060 set_opt(sbi
->s_mount_opt
, QUOTA
);
1061 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1064 if (sb_any_quota_enabled(sb
)) {
1065 printk(KERN_ERR
"EXT4-fs: Cannot change quota "
1066 "options when quota turned on.\n");
1069 clear_opt(sbi
->s_mount_opt
, QUOTA
);
1070 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1071 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1079 case Opt_offusrjquota
:
1080 case Opt_offgrpjquota
:
1081 case Opt_jqfmt_vfsold
:
1082 case Opt_jqfmt_vfsv0
:
1084 "EXT4-fs: journalled quota options not "
1091 set_opt(sbi
->s_mount_opt
, ABORT
);
1094 if (match_int(&args
[0], &option
))
1097 set_opt(sbi
->s_mount_opt
, BARRIER
);
1099 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1105 printk("EXT4-fs: resize option only available "
1109 if (match_int(&args
[0], &option
) != 0)
1111 *n_blocks_count
= option
;
1114 set_opt(sbi
->s_mount_opt
, NOBH
);
1117 clear_opt(sbi
->s_mount_opt
, NOBH
);
1120 set_opt (sbi
->s_mount_opt
, EXTENTS
);
1124 "EXT4-fs: Unrecognized mount option \"%s\" "
1125 "or missing value\n", p
);
1130 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1131 if ((sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
) &&
1132 sbi
->s_qf_names
[USRQUOTA
])
1133 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1135 if ((sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
) &&
1136 sbi
->s_qf_names
[GRPQUOTA
])
1137 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1139 if ((sbi
->s_qf_names
[USRQUOTA
] &&
1140 (sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
)) ||
1141 (sbi
->s_qf_names
[GRPQUOTA
] &&
1142 (sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
))) {
1143 printk(KERN_ERR
"EXT4-fs: old and new quota "
1144 "format mixing.\n");
1148 if (!sbi
->s_jquota_fmt
) {
1149 printk(KERN_ERR
"EXT4-fs: journalled quota format "
1150 "not specified.\n");
1154 if (sbi
->s_jquota_fmt
) {
1155 printk(KERN_ERR
"EXT4-fs: journalled quota format "
1156 "specified with no journalling "
1165 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1168 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1171 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1172 printk (KERN_ERR
"EXT4-fs warning: revision level too high, "
1173 "forcing read-only mode\n");
1178 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1179 printk (KERN_WARNING
"EXT4-fs warning: mounting unchecked fs, "
1180 "running e2fsck is recommended\n");
1181 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1182 printk (KERN_WARNING
1183 "EXT4-fs warning: mounting fs with errors, "
1184 "running e2fsck is recommended\n");
1185 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
1186 le16_to_cpu(es
->s_mnt_count
) >=
1187 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1188 printk (KERN_WARNING
1189 "EXT4-fs warning: maximal mount count reached, "
1190 "running e2fsck is recommended\n");
1191 else if (le32_to_cpu(es
->s_checkinterval
) &&
1192 (le32_to_cpu(es
->s_lastcheck
) +
1193 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1194 printk (KERN_WARNING
1195 "EXT4-fs warning: checktime reached, "
1196 "running e2fsck is recommended\n");
1198 /* @@@ We _will_ want to clear the valid bit if we find
1199 * inconsistencies, to force a fsck at reboot. But for
1200 * a plain journaled filesystem we can keep it set as
1203 es
->s_state
= cpu_to_le16(le16_to_cpu(es
->s_state
) & ~EXT4_VALID_FS
);
1205 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1206 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1207 es
->s_mnt_count
=cpu_to_le16(le16_to_cpu(es
->s_mnt_count
) + 1);
1208 es
->s_mtime
= cpu_to_le32(get_seconds());
1209 ext4_update_dynamic_rev(sb
);
1210 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1212 ext4_commit_super(sb
, es
, 1);
1213 if (test_opt(sb
, DEBUG
))
1214 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%lu, "
1215 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1217 sbi
->s_groups_count
,
1218 EXT4_BLOCKS_PER_GROUP(sb
),
1219 EXT4_INODES_PER_GROUP(sb
),
1222 printk(KERN_INFO
"EXT4 FS on %s, ", sb
->s_id
);
1223 if (EXT4_SB(sb
)->s_journal
->j_inode
== NULL
) {
1224 char b
[BDEVNAME_SIZE
];
1226 printk("external journal on %s\n",
1227 bdevname(EXT4_SB(sb
)->s_journal
->j_dev
, b
));
1229 printk("internal journal\n");
1234 /* Called at mount-time, super-block is locked */
1235 static int ext4_check_descriptors (struct super_block
* sb
)
1237 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1238 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
1239 ext4_fsblk_t last_block
;
1240 ext4_fsblk_t block_bitmap
;
1241 ext4_fsblk_t inode_bitmap
;
1242 ext4_fsblk_t inode_table
;
1243 struct ext4_group_desc
* gdp
= NULL
;
1247 ext4_debug ("Checking group descriptors");
1249 for (i
= 0; i
< sbi
->s_groups_count
; i
++)
1251 if (i
== sbi
->s_groups_count
- 1)
1252 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
1254 last_block
= first_block
+
1255 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
1257 if ((i
% EXT4_DESC_PER_BLOCK(sb
)) == 0)
1258 gdp
= (struct ext4_group_desc
*)
1259 sbi
->s_group_desc
[desc_block
++]->b_data
;
1260 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
1261 if (block_bitmap
< first_block
|| block_bitmap
> last_block
)
1263 ext4_error (sb
, "ext4_check_descriptors",
1264 "Block bitmap for group %d"
1265 " not in group (block %llu)!",
1269 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
1270 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
)
1272 ext4_error (sb
, "ext4_check_descriptors",
1273 "Inode bitmap for group %d"
1274 " not in group (block %llu)!",
1278 inode_table
= ext4_inode_table(sb
, gdp
);
1279 if (inode_table
< first_block
||
1280 inode_table
+ sbi
->s_itb_per_group
> last_block
)
1282 ext4_error (sb
, "ext4_check_descriptors",
1283 "Inode table for group %d"
1284 " not in group (block %llu)!",
1288 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
1289 gdp
= (struct ext4_group_desc
*)
1290 ((__u8
*)gdp
+ EXT4_DESC_SIZE(sb
));
1293 ext4_free_blocks_count_set(sbi
->s_es
, ext4_count_free_blocks(sb
));
1294 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
1299 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1300 * the superblock) which were deleted from all directories, but held open by
1301 * a process at the time of a crash. We walk the list and try to delete these
1302 * inodes at recovery time (only with a read-write filesystem).
1304 * In order to keep the orphan inode chain consistent during traversal (in
1305 * case of crash during recovery), we link each inode into the superblock
1306 * orphan list_head and handle it the same way as an inode deletion during
1307 * normal operation (which journals the operations for us).
1309 * We only do an iget() and an iput() on each inode, which is very safe if we
1310 * accidentally point at an in-use or already deleted inode. The worst that
1311 * can happen in this case is that we get a "bit already cleared" message from
1312 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1313 * e2fsck was run on this filesystem, and it must have already done the orphan
1314 * inode cleanup for us, so we can safely abort without any further action.
1316 static void ext4_orphan_cleanup (struct super_block
* sb
,
1317 struct ext4_super_block
* es
)
1319 unsigned int s_flags
= sb
->s_flags
;
1320 int nr_orphans
= 0, nr_truncates
= 0;
1324 if (!es
->s_last_orphan
) {
1325 jbd_debug(4, "no orphan inodes to clean up\n");
1329 if (bdev_read_only(sb
->s_bdev
)) {
1330 printk(KERN_ERR
"EXT4-fs: write access "
1331 "unavailable, skipping orphan cleanup.\n");
1335 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
1336 if (es
->s_last_orphan
)
1337 jbd_debug(1, "Errors on filesystem, "
1338 "clearing orphan list.\n");
1339 es
->s_last_orphan
= 0;
1340 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1344 if (s_flags
& MS_RDONLY
) {
1345 printk(KERN_INFO
"EXT4-fs: %s: orphan cleanup on readonly fs\n",
1347 sb
->s_flags
&= ~MS_RDONLY
;
1350 /* Needed for iput() to work correctly and not trash data */
1351 sb
->s_flags
|= MS_ACTIVE
;
1352 /* Turn on quotas so that they are updated correctly */
1353 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1354 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
1355 int ret
= ext4_quota_on_mount(sb
, i
);
1358 "EXT4-fs: Cannot turn on journalled "
1359 "quota: error %d\n", ret
);
1364 while (es
->s_last_orphan
) {
1365 struct inode
*inode
;
1368 ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
)))) {
1369 es
->s_last_orphan
= 0;
1373 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
1375 if (inode
->i_nlink
) {
1377 "%s: truncating inode %lu to %Ld bytes\n",
1378 __FUNCTION__
, inode
->i_ino
, inode
->i_size
);
1379 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1380 inode
->i_ino
, inode
->i_size
);
1381 ext4_truncate(inode
);
1385 "%s: deleting unreferenced inode %lu\n",
1386 __FUNCTION__
, inode
->i_ino
);
1387 jbd_debug(2, "deleting unreferenced inode %lu\n",
1391 iput(inode
); /* The delete magic happens here! */
1394 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1397 printk(KERN_INFO
"EXT4-fs: %s: %d orphan inode%s deleted\n",
1398 sb
->s_id
, PLURAL(nr_orphans
));
1400 printk(KERN_INFO
"EXT4-fs: %s: %d truncate%s cleaned up\n",
1401 sb
->s_id
, PLURAL(nr_truncates
));
1403 /* Turn quotas off */
1404 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1405 if (sb_dqopt(sb
)->files
[i
])
1406 vfs_quota_off(sb
, i
);
1409 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
1412 #define log2(n) ffz(~(n))
1415 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1416 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1417 * We need to be 1 filesystem block less than the 2^32 sector limit.
1419 static loff_t
ext4_max_size(int bits
)
1421 loff_t res
= EXT4_NDIR_BLOCKS
;
1422 /* This constant is calculated to be the largest file size for a
1423 * dense, 4k-blocksize file such that the total number of
1424 * sectors in the file, including data and all indirect blocks,
1425 * does not exceed 2^32. */
1426 const loff_t upper_limit
= 0x1ff7fffd000LL
;
1428 res
+= 1LL << (bits
-2);
1429 res
+= 1LL << (2*(bits
-2));
1430 res
+= 1LL << (3*(bits
-2));
1432 if (res
> upper_limit
)
1437 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
1438 ext4_fsblk_t logical_sb_block
, int nr
)
1440 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1441 unsigned long bg
, first_meta_bg
;
1444 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
1446 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
1448 return logical_sb_block
+ nr
+ 1;
1449 bg
= sbi
->s_desc_per_block
* nr
;
1450 if (ext4_bg_has_super(sb
, bg
))
1452 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
1456 static int ext4_fill_super (struct super_block
*sb
, void *data
, int silent
)
1458 struct buffer_head
* bh
;
1459 struct ext4_super_block
*es
= NULL
;
1460 struct ext4_sb_info
*sbi
;
1462 ext4_fsblk_t sb_block
= get_sb_block(&data
);
1463 ext4_fsblk_t logical_sb_block
;
1464 unsigned long offset
= 0;
1465 unsigned int journal_inum
= 0;
1466 unsigned long journal_devnum
= 0;
1467 unsigned long def_mount_opts
;
1477 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
1480 sb
->s_fs_info
= sbi
;
1481 sbi
->s_mount_opt
= 0;
1482 sbi
->s_resuid
= EXT4_DEF_RESUID
;
1483 sbi
->s_resgid
= EXT4_DEF_RESGID
;
1487 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
1489 printk(KERN_ERR
"EXT4-fs: unable to set blocksize\n");
1494 * The ext4 superblock will not be buffer aligned for other than 1kB
1495 * block sizes. We need to calculate the offset from buffer start.
1497 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
1498 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
1499 offset
= do_div(logical_sb_block
, blocksize
);
1501 logical_sb_block
= sb_block
;
1504 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
1505 printk (KERN_ERR
"EXT4-fs: unable to read superblock\n");
1509 * Note: s_es must be initialized as soon as possible because
1510 * some ext4 macro-instructions depend on its value
1512 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
1514 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
1515 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
1518 /* Set defaults before we parse the mount options */
1519 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
1520 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
1521 set_opt(sbi
->s_mount_opt
, DEBUG
);
1522 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
1523 set_opt(sbi
->s_mount_opt
, GRPID
);
1524 if (def_mount_opts
& EXT4_DEFM_UID16
)
1525 set_opt(sbi
->s_mount_opt
, NO_UID32
);
1526 #ifdef CONFIG_EXT4DEV_FS_XATTR
1527 if (def_mount_opts
& EXT4_DEFM_XATTR_USER
)
1528 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
1530 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1531 if (def_mount_opts
& EXT4_DEFM_ACL
)
1532 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1534 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
1535 sbi
->s_mount_opt
|= EXT4_MOUNT_JOURNAL_DATA
;
1536 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
1537 sbi
->s_mount_opt
|= EXT4_MOUNT_ORDERED_DATA
;
1538 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
1539 sbi
->s_mount_opt
|= EXT4_MOUNT_WRITEBACK_DATA
;
1541 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
1542 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1543 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_RO
)
1544 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1546 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1548 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
1549 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
1551 set_opt(sbi
->s_mount_opt
, RESERVATION
);
1553 if (!parse_options ((char *) data
, sb
, &journal_inum
, &journal_devnum
,
1557 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
1558 ((sbi
->s_mount_opt
& EXT4_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
1560 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
1561 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
1562 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
1563 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
1565 "EXT4-fs warning: feature flags set on rev 0 fs, "
1566 "running e2fsck is recommended\n");
1568 * Check feature flags regardless of the revision level, since we
1569 * previously didn't change the revision level when setting the flags,
1570 * so there is a chance incompat flags are set on a rev 0 filesystem.
1572 features
= EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
);
1574 printk(KERN_ERR
"EXT4-fs: %s: couldn't mount because of "
1575 "unsupported optional features (%x).\n",
1576 sb
->s_id
, le32_to_cpu(features
));
1579 features
= EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
);
1580 if (!(sb
->s_flags
& MS_RDONLY
) && features
) {
1581 printk(KERN_ERR
"EXT4-fs: %s: couldn't mount RDWR because of "
1582 "unsupported optional features (%x).\n",
1583 sb
->s_id
, le32_to_cpu(features
));
1586 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
1588 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
1589 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
1591 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
1592 blocksize
, sb
->s_id
);
1596 hblock
= bdev_hardsect_size(sb
->s_bdev
);
1597 if (sb
->s_blocksize
!= blocksize
) {
1599 * Make sure the blocksize for the filesystem is larger
1600 * than the hardware sectorsize for the machine.
1602 if (blocksize
< hblock
) {
1603 printk(KERN_ERR
"EXT4-fs: blocksize %d too small for "
1604 "device blocksize %d.\n", blocksize
, hblock
);
1609 sb_set_blocksize(sb
, blocksize
);
1610 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
1611 offset
= do_div(logical_sb_block
, blocksize
);
1612 bh
= sb_bread(sb
, logical_sb_block
);
1615 "EXT4-fs: Can't read superblock on 2nd try.\n");
1618 es
= (struct ext4_super_block
*)(((char *)bh
->b_data
) + offset
);
1620 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
1622 "EXT4-fs: Magic mismatch, very weird !\n");
1627 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
);
1629 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
1630 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
1631 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
1633 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
1634 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
1635 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
1636 (sbi
->s_inode_size
& (sbi
->s_inode_size
- 1)) ||
1637 (sbi
->s_inode_size
> blocksize
)) {
1639 "EXT4-fs: unsupported inode size: %d\n",
1644 sbi
->s_frag_size
= EXT4_MIN_FRAG_SIZE
<<
1645 le32_to_cpu(es
->s_log_frag_size
);
1646 if (blocksize
!= sbi
->s_frag_size
) {
1648 "EXT4-fs: fragsize %lu != blocksize %u (unsupported)\n",
1649 sbi
->s_frag_size
, blocksize
);
1652 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
1653 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
1654 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
1655 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
1656 sbi
->s_desc_size
& (sbi
->s_desc_size
- 1)) {
1658 "EXT4-fs: unsupported descriptor size %lu\n",
1663 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
1664 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
1665 sbi
->s_frags_per_group
= le32_to_cpu(es
->s_frags_per_group
);
1666 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
1667 if (EXT4_INODE_SIZE(sb
) == 0)
1669 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
1670 if (sbi
->s_inodes_per_block
== 0)
1672 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
1673 sbi
->s_inodes_per_block
;
1674 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
1676 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
1677 sbi
->s_addr_per_block_bits
= log2(EXT4_ADDR_PER_BLOCK(sb
));
1678 sbi
->s_desc_per_block_bits
= log2(EXT4_DESC_PER_BLOCK(sb
));
1679 for (i
=0; i
< 4; i
++)
1680 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
1681 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
1683 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
1685 "EXT4-fs: #blocks per group too big: %lu\n",
1686 sbi
->s_blocks_per_group
);
1689 if (sbi
->s_frags_per_group
> blocksize
* 8) {
1691 "EXT4-fs: #fragments per group too big: %lu\n",
1692 sbi
->s_frags_per_group
);
1695 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
1697 "EXT4-fs: #inodes per group too big: %lu\n",
1698 sbi
->s_inodes_per_group
);
1702 if (ext4_blocks_count(es
) >
1703 (sector_t
)(~0ULL) >> (sb
->s_blocksize_bits
- 9)) {
1704 printk(KERN_ERR
"EXT4-fs: filesystem on %s:"
1705 " too large to mount safely\n", sb
->s_id
);
1706 if (sizeof(sector_t
) < 8)
1707 printk(KERN_WARNING
"EXT4-fs: CONFIG_LBD not "
1712 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
1714 blocks_count
= (ext4_blocks_count(es
) -
1715 le32_to_cpu(es
->s_first_data_block
) +
1716 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
1717 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
1718 sbi
->s_groups_count
= blocks_count
;
1719 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
1720 EXT4_DESC_PER_BLOCK(sb
);
1721 sbi
->s_group_desc
= kmalloc(db_count
* sizeof (struct buffer_head
*),
1723 if (sbi
->s_group_desc
== NULL
) {
1724 printk (KERN_ERR
"EXT4-fs: not enough memory\n");
1728 bgl_lock_init(&sbi
->s_blockgroup_lock
);
1730 for (i
= 0; i
< db_count
; i
++) {
1731 block
= descriptor_loc(sb
, logical_sb_block
, i
);
1732 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
1733 if (!sbi
->s_group_desc
[i
]) {
1734 printk (KERN_ERR
"EXT4-fs: "
1735 "can't read group descriptor %d\n", i
);
1740 if (!ext4_check_descriptors (sb
)) {
1741 printk(KERN_ERR
"EXT4-fs: group descriptors corrupted!\n");
1744 sbi
->s_gdb_count
= db_count
;
1745 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
1746 spin_lock_init(&sbi
->s_next_gen_lock
);
1748 percpu_counter_init(&sbi
->s_freeblocks_counter
,
1749 ext4_count_free_blocks(sb
));
1750 percpu_counter_init(&sbi
->s_freeinodes_counter
,
1751 ext4_count_free_inodes(sb
));
1752 percpu_counter_init(&sbi
->s_dirs_counter
,
1753 ext4_count_dirs(sb
));
1755 /* per fileystem reservation list head & lock */
1756 spin_lock_init(&sbi
->s_rsv_window_lock
);
1757 sbi
->s_rsv_window_root
= RB_ROOT
;
1758 /* Add a single, static dummy reservation to the start of the
1759 * reservation window list --- it gives us a placeholder for
1760 * append-at-start-of-list which makes the allocation logic
1761 * _much_ simpler. */
1762 sbi
->s_rsv_window_head
.rsv_start
= EXT4_RESERVE_WINDOW_NOT_ALLOCATED
;
1763 sbi
->s_rsv_window_head
.rsv_end
= EXT4_RESERVE_WINDOW_NOT_ALLOCATED
;
1764 sbi
->s_rsv_window_head
.rsv_alloc_hit
= 0;
1765 sbi
->s_rsv_window_head
.rsv_goal_size
= 0;
1766 ext4_rsv_window_add(sb
, &sbi
->s_rsv_window_head
);
1769 * set up enough so that it can read an inode
1771 sb
->s_op
= &ext4_sops
;
1772 sb
->s_export_op
= &ext4_export_ops
;
1773 sb
->s_xattr
= ext4_xattr_handlers
;
1775 sb
->s_qcop
= &ext4_qctl_operations
;
1776 sb
->dq_op
= &ext4_quota_operations
;
1778 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
1782 needs_recovery
= (es
->s_last_orphan
!= 0 ||
1783 EXT4_HAS_INCOMPAT_FEATURE(sb
,
1784 EXT4_FEATURE_INCOMPAT_RECOVER
));
1787 * The first inode we look at is the journal inode. Don't try
1788 * root first: it may be modified in the journal!
1790 if (!test_opt(sb
, NOLOAD
) &&
1791 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
1792 if (ext4_load_journal(sb
, es
, journal_devnum
))
1794 } else if (journal_inum
) {
1795 if (ext4_create_journal(sb
, es
, journal_inum
))
1800 "ext4: No journal on filesystem on %s\n",
1805 /* We have now updated the journal if required, so we can
1806 * validate the data journaling mode. */
1807 switch (test_opt(sb
, DATA_FLAGS
)) {
1809 /* No mode set, assume a default based on the journal
1810 * capabilities: ORDERED_DATA if the journal can
1811 * cope, else JOURNAL_DATA
1813 if (jbd2_journal_check_available_features
1814 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
1815 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
1817 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
1820 case EXT4_MOUNT_ORDERED_DATA
:
1821 case EXT4_MOUNT_WRITEBACK_DATA
:
1822 if (!jbd2_journal_check_available_features
1823 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
1824 printk(KERN_ERR
"EXT4-fs: Journal does not support "
1825 "requested data journaling mode\n");
1832 if (test_opt(sb
, NOBH
)) {
1833 if (!(test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)) {
1834 printk(KERN_WARNING
"EXT4-fs: Ignoring nobh option - "
1835 "its supported only with writeback mode\n");
1836 clear_opt(sbi
->s_mount_opt
, NOBH
);
1840 * The jbd2_journal_load will have done any necessary log recovery,
1841 * so we can safely mount the rest of the filesystem now.
1844 root
= iget(sb
, EXT4_ROOT_INO
);
1845 sb
->s_root
= d_alloc_root(root
);
1847 printk(KERN_ERR
"EXT4-fs: get root inode failed\n");
1851 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
1854 printk(KERN_ERR
"EXT4-fs: corrupt root inode, run e2fsck\n");
1858 ext4_setup_super (sb
, es
, sb
->s_flags
& MS_RDONLY
);
1860 * akpm: core read_super() calls in here with the superblock locked.
1861 * That deadlocks, because orphan cleanup needs to lock the superblock
1862 * in numerous places. Here we just pop the lock - it's relatively
1863 * harmless, because we are now ready to accept write_super() requests,
1864 * and aviro says that's the only reason for hanging onto the
1867 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
1868 ext4_orphan_cleanup(sb
, es
);
1869 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
1871 printk (KERN_INFO
"EXT4-fs: recovery complete.\n");
1872 ext4_mark_recovery_complete(sb
, es
);
1873 printk (KERN_INFO
"EXT4-fs: mounted filesystem with %s data mode.\n",
1874 test_opt(sb
,DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
? "journal":
1875 test_opt(sb
,DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
? "ordered":
1885 printk(KERN_ERR
"VFS: Can't find ext4 filesystem on dev %s.\n",
1890 jbd2_journal_destroy(sbi
->s_journal
);
1892 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
1893 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
1894 percpu_counter_destroy(&sbi
->s_dirs_counter
);
1896 for (i
= 0; i
< db_count
; i
++)
1897 brelse(sbi
->s_group_desc
[i
]);
1898 kfree(sbi
->s_group_desc
);
1901 for (i
= 0; i
< MAXQUOTAS
; i
++)
1902 kfree(sbi
->s_qf_names
[i
]);
1904 ext4_blkdev_remove(sbi
);
1907 sb
->s_fs_info
= NULL
;
1914 * Setup any per-fs journal parameters now. We'll do this both on
1915 * initial mount, once the journal has been initialised but before we've
1916 * done any recovery; and again on any subsequent remount.
1918 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
1920 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1922 if (sbi
->s_commit_interval
)
1923 journal
->j_commit_interval
= sbi
->s_commit_interval
;
1924 /* We could also set up an ext4-specific default for the commit
1925 * interval here, but for now we'll just fall back to the jbd
1928 spin_lock(&journal
->j_state_lock
);
1929 if (test_opt(sb
, BARRIER
))
1930 journal
->j_flags
|= JBD2_BARRIER
;
1932 journal
->j_flags
&= ~JBD2_BARRIER
;
1933 spin_unlock(&journal
->j_state_lock
);
1936 static journal_t
*ext4_get_journal(struct super_block
*sb
,
1937 unsigned int journal_inum
)
1939 struct inode
*journal_inode
;
1942 /* First, test for the existence of a valid inode on disk. Bad
1943 * things happen if we iget() an unused inode, as the subsequent
1944 * iput() will try to delete it. */
1946 journal_inode
= iget(sb
, journal_inum
);
1947 if (!journal_inode
) {
1948 printk(KERN_ERR
"EXT4-fs: no journal found.\n");
1951 if (!journal_inode
->i_nlink
) {
1952 make_bad_inode(journal_inode
);
1953 iput(journal_inode
);
1954 printk(KERN_ERR
"EXT4-fs: journal inode is deleted.\n");
1958 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1959 journal_inode
, journal_inode
->i_size
);
1960 if (is_bad_inode(journal_inode
) || !S_ISREG(journal_inode
->i_mode
)) {
1961 printk(KERN_ERR
"EXT4-fs: invalid journal inode.\n");
1962 iput(journal_inode
);
1966 journal
= jbd2_journal_init_inode(journal_inode
);
1968 printk(KERN_ERR
"EXT4-fs: Could not load journal inode\n");
1969 iput(journal_inode
);
1972 journal
->j_private
= sb
;
1973 ext4_init_journal_params(sb
, journal
);
1977 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
1980 struct buffer_head
* bh
;
1984 int hblock
, blocksize
;
1985 ext4_fsblk_t sb_block
;
1986 unsigned long offset
;
1987 struct ext4_super_block
* es
;
1988 struct block_device
*bdev
;
1990 bdev
= ext4_blkdev_get(j_dev
);
1994 if (bd_claim(bdev
, sb
)) {
1996 "EXT4: failed to claim external journal device.\n");
2001 blocksize
= sb
->s_blocksize
;
2002 hblock
= bdev_hardsect_size(bdev
);
2003 if (blocksize
< hblock
) {
2005 "EXT4-fs: blocksize too small for journal device.\n");
2009 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
2010 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
2011 set_blocksize(bdev
, blocksize
);
2012 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
2013 printk(KERN_ERR
"EXT4-fs: couldn't read superblock of "
2014 "external journal\n");
2018 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
2019 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
2020 !(le32_to_cpu(es
->s_feature_incompat
) &
2021 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
2022 printk(KERN_ERR
"EXT4-fs: external journal has "
2023 "bad superblock\n");
2028 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
2029 printk(KERN_ERR
"EXT4-fs: journal UUID does not match\n");
2034 len
= ext4_blocks_count(es
);
2035 start
= sb_block
+ 1;
2036 brelse(bh
); /* we're done with the superblock */
2038 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
2039 start
, len
, blocksize
);
2041 printk(KERN_ERR
"EXT4-fs: failed to create device journal\n");
2044 journal
->j_private
= sb
;
2045 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
2046 wait_on_buffer(journal
->j_sb_buffer
);
2047 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
2048 printk(KERN_ERR
"EXT4-fs: I/O error on journal device\n");
2051 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
2052 printk(KERN_ERR
"EXT4-fs: External journal has more than one "
2053 "user (unsupported) - %d\n",
2054 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
2057 EXT4_SB(sb
)->journal_bdev
= bdev
;
2058 ext4_init_journal_params(sb
, journal
);
2061 jbd2_journal_destroy(journal
);
2063 ext4_blkdev_put(bdev
);
2067 static int ext4_load_journal(struct super_block
*sb
,
2068 struct ext4_super_block
*es
,
2069 unsigned long journal_devnum
)
2072 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
2075 int really_read_only
;
2077 if (journal_devnum
&&
2078 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
2079 printk(KERN_INFO
"EXT4-fs: external journal device major/minor "
2080 "numbers have changed\n");
2081 journal_dev
= new_decode_dev(journal_devnum
);
2083 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
2085 really_read_only
= bdev_read_only(sb
->s_bdev
);
2088 * Are we loading a blank journal or performing recovery after a
2089 * crash? For recovery, we need to check in advance whether we
2090 * can get read-write access to the device.
2093 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
2094 if (sb
->s_flags
& MS_RDONLY
) {
2095 printk(KERN_INFO
"EXT4-fs: INFO: recovery "
2096 "required on readonly filesystem.\n");
2097 if (really_read_only
) {
2098 printk(KERN_ERR
"EXT4-fs: write access "
2099 "unavailable, cannot proceed.\n");
2102 printk (KERN_INFO
"EXT4-fs: write access will "
2103 "be enabled during recovery.\n");
2107 if (journal_inum
&& journal_dev
) {
2108 printk(KERN_ERR
"EXT4-fs: filesystem has both journal "
2109 "and inode journals!\n");
2114 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
2117 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
2121 if (!really_read_only
&& test_opt(sb
, UPDATE_JOURNAL
)) {
2122 err
= jbd2_journal_update_format(journal
);
2124 printk(KERN_ERR
"EXT4-fs: error updating journal.\n");
2125 jbd2_journal_destroy(journal
);
2130 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
2131 err
= jbd2_journal_wipe(journal
, !really_read_only
);
2133 err
= jbd2_journal_load(journal
);
2136 printk(KERN_ERR
"EXT4-fs: error loading journal.\n");
2137 jbd2_journal_destroy(journal
);
2141 EXT4_SB(sb
)->s_journal
= journal
;
2142 ext4_clear_journal_err(sb
, es
);
2144 if (journal_devnum
&&
2145 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
2146 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
2149 /* Make sure we flush the recovery flag to disk. */
2150 ext4_commit_super(sb
, es
, 1);
2156 static int ext4_create_journal(struct super_block
* sb
,
2157 struct ext4_super_block
* es
,
2158 unsigned int journal_inum
)
2163 if (sb
->s_flags
& MS_RDONLY
) {
2164 printk(KERN_ERR
"EXT4-fs: readonly filesystem when trying to "
2165 "create journal.\n");
2169 journal
= ext4_get_journal(sb
, journal_inum
);
2173 printk(KERN_INFO
"EXT4-fs: creating new journal on inode %u\n",
2176 err
= jbd2_journal_create(journal
);
2178 printk(KERN_ERR
"EXT4-fs: error creating journal.\n");
2179 jbd2_journal_destroy(journal
);
2183 EXT4_SB(sb
)->s_journal
= journal
;
2185 ext4_update_dynamic_rev(sb
);
2186 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
2187 EXT4_SET_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
);
2189 es
->s_journal_inum
= cpu_to_le32(journal_inum
);
2192 /* Make sure we flush the recovery flag to disk. */
2193 ext4_commit_super(sb
, es
, 1);
2198 static void ext4_commit_super (struct super_block
* sb
,
2199 struct ext4_super_block
* es
,
2202 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
2206 es
->s_wtime
= cpu_to_le32(get_seconds());
2207 ext4_free_blocks_count_set(es
, ext4_count_free_blocks(sb
));
2208 es
->s_free_inodes_count
= cpu_to_le32(ext4_count_free_inodes(sb
));
2209 BUFFER_TRACE(sbh
, "marking dirty");
2210 mark_buffer_dirty(sbh
);
2212 sync_dirty_buffer(sbh
);
2217 * Have we just finished recovery? If so, and if we are mounting (or
2218 * remounting) the filesystem readonly, then we will end up with a
2219 * consistent fs on disk. Record that fact.
2221 static void ext4_mark_recovery_complete(struct super_block
* sb
,
2222 struct ext4_super_block
* es
)
2224 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
2226 jbd2_journal_lock_updates(journal
);
2227 jbd2_journal_flush(journal
);
2229 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
2230 sb
->s_flags
& MS_RDONLY
) {
2231 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
2233 ext4_commit_super(sb
, es
, 1);
2236 jbd2_journal_unlock_updates(journal
);
2240 * If we are mounting (or read-write remounting) a filesystem whose journal
2241 * has recorded an error from a previous lifetime, move that error to the
2242 * main filesystem now.
2244 static void ext4_clear_journal_err(struct super_block
* sb
,
2245 struct ext4_super_block
* es
)
2251 journal
= EXT4_SB(sb
)->s_journal
;
2254 * Now check for any error status which may have been recorded in the
2255 * journal by a prior ext4_error() or ext4_abort()
2258 j_errno
= jbd2_journal_errno(journal
);
2262 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
2263 ext4_warning(sb
, __FUNCTION__
, "Filesystem error recorded "
2264 "from previous mount: %s", errstr
);
2265 ext4_warning(sb
, __FUNCTION__
, "Marking fs in need of "
2266 "filesystem check.");
2268 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
2269 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
2270 ext4_commit_super (sb
, es
, 1);
2272 jbd2_journal_clear_err(journal
);
2277 * Force the running and committing transactions to commit,
2278 * and wait on the commit.
2280 int ext4_force_commit(struct super_block
*sb
)
2285 if (sb
->s_flags
& MS_RDONLY
)
2288 journal
= EXT4_SB(sb
)->s_journal
;
2290 ret
= ext4_journal_force_commit(journal
);
2295 * Ext4 always journals updates to the superblock itself, so we don't
2296 * have to propagate any other updates to the superblock on disk at this
2297 * point. Just start an async writeback to get the buffers on their way
2300 * This implicitly triggers the writebehind on sync().
2303 static void ext4_write_super (struct super_block
* sb
)
2305 if (mutex_trylock(&sb
->s_lock
) != 0)
2310 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
2315 if (jbd2_journal_start_commit(EXT4_SB(sb
)->s_journal
, &target
)) {
2317 jbd2_log_wait_commit(EXT4_SB(sb
)->s_journal
, target
);
2323 * LVM calls this function before a (read-only) snapshot is created. This
2324 * gives us a chance to flush the journal completely and mark the fs clean.
2326 static void ext4_write_super_lockfs(struct super_block
*sb
)
2330 if (!(sb
->s_flags
& MS_RDONLY
)) {
2331 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
2333 /* Now we set up the journal barrier. */
2334 jbd2_journal_lock_updates(journal
);
2335 jbd2_journal_flush(journal
);
2337 /* Journal blocked and flushed, clear needs_recovery flag. */
2338 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
2339 ext4_commit_super(sb
, EXT4_SB(sb
)->s_es
, 1);
2344 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2345 * flag here, even though the filesystem is not technically dirty yet.
2347 static void ext4_unlockfs(struct super_block
*sb
)
2349 if (!(sb
->s_flags
& MS_RDONLY
)) {
2351 /* Reser the needs_recovery flag before the fs is unlocked. */
2352 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
2353 ext4_commit_super(sb
, EXT4_SB(sb
)->s_es
, 1);
2355 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
2359 static int ext4_remount (struct super_block
* sb
, int * flags
, char * data
)
2361 struct ext4_super_block
* es
;
2362 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2363 ext4_fsblk_t n_blocks_count
= 0;
2364 unsigned long old_sb_flags
;
2365 struct ext4_mount_options old_opts
;
2371 /* Store the original options */
2372 old_sb_flags
= sb
->s_flags
;
2373 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
2374 old_opts
.s_resuid
= sbi
->s_resuid
;
2375 old_opts
.s_resgid
= sbi
->s_resgid
;
2376 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
2378 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
2379 for (i
= 0; i
< MAXQUOTAS
; i
++)
2380 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
2384 * Allow the "check" option to be passed as a remount option.
2386 if (!parse_options(data
, sb
, NULL
, NULL
, &n_blocks_count
, 1)) {
2391 if (sbi
->s_mount_opt
& EXT4_MOUNT_ABORT
)
2392 ext4_abort(sb
, __FUNCTION__
, "Abort forced by user");
2394 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
2395 ((sbi
->s_mount_opt
& EXT4_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
2399 ext4_init_journal_params(sb
, sbi
->s_journal
);
2401 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
) ||
2402 n_blocks_count
> ext4_blocks_count(es
)) {
2403 if (sbi
->s_mount_opt
& EXT4_MOUNT_ABORT
) {
2408 if (*flags
& MS_RDONLY
) {
2410 * First of all, the unconditional stuff we have to do
2411 * to disable replay of the journal when we next remount
2413 sb
->s_flags
|= MS_RDONLY
;
2416 * OK, test if we are remounting a valid rw partition
2417 * readonly, and if so set the rdonly flag and then
2418 * mark the partition as valid again.
2420 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
2421 (sbi
->s_mount_state
& EXT4_VALID_FS
))
2422 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
2425 * We have to unlock super so that we can wait for
2429 ext4_mark_recovery_complete(sb
, es
);
2433 if ((ret
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2434 ~EXT4_FEATURE_RO_COMPAT_SUPP
))) {
2435 printk(KERN_WARNING
"EXT4-fs: %s: couldn't "
2436 "remount RDWR because of unsupported "
2437 "optional features (%x).\n",
2438 sb
->s_id
, le32_to_cpu(ret
));
2444 * If we have an unprocessed orphan list hanging
2445 * around from a previously readonly bdev mount,
2446 * require a full umount/remount for now.
2448 if (es
->s_last_orphan
) {
2449 printk(KERN_WARNING
"EXT4-fs: %s: couldn't "
2450 "remount RDWR because of unprocessed "
2451 "orphan inode list. Please "
2452 "umount/remount instead.\n",
2459 * Mounting a RDONLY partition read-write, so reread
2460 * and store the current valid flag. (It may have
2461 * been changed by e2fsck since we originally mounted
2464 ext4_clear_journal_err(sb
, es
);
2465 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
2466 if ((err
= ext4_group_extend(sb
, es
, n_blocks_count
)))
2468 if (!ext4_setup_super (sb
, es
, 0))
2469 sb
->s_flags
&= ~MS_RDONLY
;
2473 /* Release old quota file names */
2474 for (i
= 0; i
< MAXQUOTAS
; i
++)
2475 if (old_opts
.s_qf_names
[i
] &&
2476 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
2477 kfree(old_opts
.s_qf_names
[i
]);
2481 sb
->s_flags
= old_sb_flags
;
2482 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
2483 sbi
->s_resuid
= old_opts
.s_resuid
;
2484 sbi
->s_resgid
= old_opts
.s_resgid
;
2485 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
2487 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
2488 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2489 if (sbi
->s_qf_names
[i
] &&
2490 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
2491 kfree(sbi
->s_qf_names
[i
]);
2492 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
2498 static int ext4_statfs (struct dentry
* dentry
, struct kstatfs
* buf
)
2500 struct super_block
*sb
= dentry
->d_sb
;
2501 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2502 struct ext4_super_block
*es
= sbi
->s_es
;
2503 ext4_fsblk_t overhead
;
2507 if (test_opt (sb
, MINIX_DF
))
2510 unsigned long ngroups
;
2511 ngroups
= EXT4_SB(sb
)->s_groups_count
;
2515 * Compute the overhead (FS structures)
2519 * All of the blocks before first_data_block are
2522 overhead
= le32_to_cpu(es
->s_first_data_block
);
2525 * Add the overhead attributed to the superblock and
2526 * block group descriptors. If the sparse superblocks
2527 * feature is turned on, then not all groups have this.
2529 for (i
= 0; i
< ngroups
; i
++) {
2530 overhead
+= ext4_bg_has_super(sb
, i
) +
2531 ext4_bg_num_gdb(sb
, i
);
2536 * Every block group has an inode bitmap, a block
2537 * bitmap, and an inode table.
2539 overhead
+= (ngroups
* (2 + EXT4_SB(sb
)->s_itb_per_group
));
2542 buf
->f_type
= EXT4_SUPER_MAGIC
;
2543 buf
->f_bsize
= sb
->s_blocksize
;
2544 buf
->f_blocks
= ext4_blocks_count(es
) - overhead
;
2545 buf
->f_bfree
= percpu_counter_sum(&sbi
->s_freeblocks_counter
);
2546 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
2547 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
2549 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
2550 buf
->f_ffree
= percpu_counter_sum(&sbi
->s_freeinodes_counter
);
2551 buf
->f_namelen
= EXT4_NAME_LEN
;
2552 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
2553 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
2554 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
2555 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
2559 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2560 * is locked for write. Otherwise the are possible deadlocks:
2561 * Process 1 Process 2
2562 * ext4_create() quota_sync()
2563 * jbd2_journal_start() write_dquot()
2564 * DQUOT_INIT() down(dqio_mutex)
2565 * down(dqio_mutex) jbd2_journal_start()
2571 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
2573 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_type
];
2576 static int ext4_dquot_initialize(struct inode
*inode
, int type
)
2581 /* We may create quota structure so we need to reserve enough blocks */
2582 handle
= ext4_journal_start(inode
, 2*EXT4_QUOTA_INIT_BLOCKS(inode
->i_sb
));
2584 return PTR_ERR(handle
);
2585 ret
= dquot_initialize(inode
, type
);
2586 err
= ext4_journal_stop(handle
);
2592 static int ext4_dquot_drop(struct inode
*inode
)
2597 /* We may delete quota structure so we need to reserve enough blocks */
2598 handle
= ext4_journal_start(inode
, 2*EXT4_QUOTA_DEL_BLOCKS(inode
->i_sb
));
2600 return PTR_ERR(handle
);
2601 ret
= dquot_drop(inode
);
2602 err
= ext4_journal_stop(handle
);
2608 static int ext4_write_dquot(struct dquot
*dquot
)
2612 struct inode
*inode
;
2614 inode
= dquot_to_inode(dquot
);
2615 handle
= ext4_journal_start(inode
,
2616 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
2618 return PTR_ERR(handle
);
2619 ret
= dquot_commit(dquot
);
2620 err
= ext4_journal_stop(handle
);
2626 static int ext4_acquire_dquot(struct dquot
*dquot
)
2631 handle
= ext4_journal_start(dquot_to_inode(dquot
),
2632 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
2634 return PTR_ERR(handle
);
2635 ret
= dquot_acquire(dquot
);
2636 err
= ext4_journal_stop(handle
);
2642 static int ext4_release_dquot(struct dquot
*dquot
)
2647 handle
= ext4_journal_start(dquot_to_inode(dquot
),
2648 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
2650 return PTR_ERR(handle
);
2651 ret
= dquot_release(dquot
);
2652 err
= ext4_journal_stop(handle
);
2658 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
2660 /* Are we journalling quotas? */
2661 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
2662 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
2663 dquot_mark_dquot_dirty(dquot
);
2664 return ext4_write_dquot(dquot
);
2666 return dquot_mark_dquot_dirty(dquot
);
2670 static int ext4_write_info(struct super_block
*sb
, int type
)
2675 /* Data block + inode block */
2676 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
2678 return PTR_ERR(handle
);
2679 ret
= dquot_commit_info(sb
, type
);
2680 err
= ext4_journal_stop(handle
);
2687 * Turn on quotas during mount time - we need to find
2688 * the quota file and such...
2690 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
2692 return vfs_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
2693 EXT4_SB(sb
)->s_jquota_fmt
, type
);
2697 * Standard function to be called on quota_on
2699 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
2703 struct nameidata nd
;
2705 if (!test_opt(sb
, QUOTA
))
2707 /* Not journalling quota? */
2708 if (!EXT4_SB(sb
)->s_qf_names
[USRQUOTA
] &&
2709 !EXT4_SB(sb
)->s_qf_names
[GRPQUOTA
])
2710 return vfs_quota_on(sb
, type
, format_id
, path
);
2711 err
= path_lookup(path
, LOOKUP_FOLLOW
, &nd
);
2714 /* Quotafile not on the same filesystem? */
2715 if (nd
.mnt
->mnt_sb
!= sb
) {
2719 /* Quotafile not of fs root? */
2720 if (nd
.dentry
->d_parent
->d_inode
!= sb
->s_root
->d_inode
)
2722 "EXT4-fs: Quota file not on filesystem root. "
2723 "Journalled quota will not work.\n");
2725 return vfs_quota_on(sb
, type
, format_id
, path
);
2728 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2729 * acquiring the locks... As quota files are never truncated and quota code
2730 * itself serializes the operations (and noone else should touch the files)
2731 * we don't have to be afraid of races */
2732 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
2733 size_t len
, loff_t off
)
2735 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
2736 sector_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
2738 int offset
= off
& (sb
->s_blocksize
- 1);
2741 struct buffer_head
*bh
;
2742 loff_t i_size
= i_size_read(inode
);
2746 if (off
+len
> i_size
)
2749 while (toread
> 0) {
2750 tocopy
= sb
->s_blocksize
- offset
< toread
?
2751 sb
->s_blocksize
- offset
: toread
;
2752 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
2755 if (!bh
) /* A hole? */
2756 memset(data
, 0, tocopy
);
2758 memcpy(data
, bh
->b_data
+offset
, tocopy
);
2768 /* Write to quotafile (we know the transaction is already started and has
2769 * enough credits) */
2770 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
2771 const char *data
, size_t len
, loff_t off
)
2773 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
2774 sector_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
2776 int offset
= off
& (sb
->s_blocksize
- 1);
2778 int journal_quota
= EXT4_SB(sb
)->s_qf_names
[type
] != NULL
;
2779 size_t towrite
= len
;
2780 struct buffer_head
*bh
;
2781 handle_t
*handle
= journal_current_handle();
2783 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
2784 while (towrite
> 0) {
2785 tocopy
= sb
->s_blocksize
- offset
< towrite
?
2786 sb
->s_blocksize
- offset
: towrite
;
2787 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
2790 if (journal_quota
) {
2791 err
= ext4_journal_get_write_access(handle
, bh
);
2798 memcpy(bh
->b_data
+offset
, data
, tocopy
);
2799 flush_dcache_page(bh
->b_page
);
2802 err
= ext4_journal_dirty_metadata(handle
, bh
);
2804 /* Always do at least ordered writes for quotas */
2805 err
= ext4_journal_dirty_data(handle
, bh
);
2806 mark_buffer_dirty(bh
);
2819 if (inode
->i_size
< off
+len
-towrite
) {
2820 i_size_write(inode
, off
+len
-towrite
);
2821 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
2824 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
2825 ext4_mark_inode_dirty(handle
, inode
);
2826 mutex_unlock(&inode
->i_mutex
);
2827 return len
- towrite
;
2832 static int ext4_get_sb(struct file_system_type
*fs_type
,
2833 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
2835 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
, mnt
);
2838 static struct file_system_type ext4dev_fs_type
= {
2839 .owner
= THIS_MODULE
,
2841 .get_sb
= ext4_get_sb
,
2842 .kill_sb
= kill_block_super
,
2843 .fs_flags
= FS_REQUIRES_DEV
,
2846 static int __init
init_ext4_fs(void)
2848 int err
= init_ext4_xattr();
2851 err
= init_inodecache();
2854 err
= register_filesystem(&ext4dev_fs_type
);
2859 destroy_inodecache();
2865 static void __exit
exit_ext4_fs(void)
2867 unregister_filesystem(&ext4dev_fs_type
);
2868 destroy_inodecache();
2872 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2873 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
2874 MODULE_LICENSE("GPL");
2875 module_init(init_ext4_fs
)
2876 module_exit(exit_ext4_fs
)