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/vmalloc.h>
24 #include <linux/jbd2.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/blkdev.h>
28 #include <linux/parser.h>
29 #include <linux/smp_lock.h>
30 #include <linux/buffer_head.h>
31 #include <linux/exportfs.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>
38 #include <linux/proc_fs.h>
39 #include <linux/ctype.h>
40 #include <linux/log2.h>
41 #include <linux/crc16.h>
42 #include <asm/uaccess.h>
45 #include "ext4_jbd2.h"
50 #define CREATE_TRACE_POINTS
51 #include <trace/events/ext4.h>
53 struct proc_dir_entry
*ext4_proc_root
;
54 static struct kset
*ext4_kset
;
56 static int ext4_load_journal(struct super_block
*, struct ext4_super_block
*,
57 unsigned long journal_devnum
);
58 static int ext4_commit_super(struct super_block
*sb
, int sync
);
59 static void ext4_mark_recovery_complete(struct super_block
*sb
,
60 struct ext4_super_block
*es
);
61 static void ext4_clear_journal_err(struct super_block
*sb
,
62 struct ext4_super_block
*es
);
63 static int ext4_sync_fs(struct super_block
*sb
, int wait
);
64 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
66 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
);
67 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
);
68 static int ext4_unfreeze(struct super_block
*sb
);
69 static void ext4_write_super(struct super_block
*sb
);
70 static int ext4_freeze(struct super_block
*sb
);
71 static int ext4_get_sb(struct file_system_type
*fs_type
, int flags
,
72 const char *dev_name
, void *data
, struct vfsmount
*mnt
);
74 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
75 static struct file_system_type ext3_fs_type
= {
78 .get_sb
= ext4_get_sb
,
79 .kill_sb
= kill_block_super
,
80 .fs_flags
= FS_REQUIRES_DEV
,
82 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
84 #define IS_EXT3_SB(sb) (0)
87 ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
88 struct ext4_group_desc
*bg
)
90 return le32_to_cpu(bg
->bg_block_bitmap_lo
) |
91 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
92 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
95 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
96 struct ext4_group_desc
*bg
)
98 return le32_to_cpu(bg
->bg_inode_bitmap_lo
) |
99 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
100 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
103 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
104 struct ext4_group_desc
*bg
)
106 return le32_to_cpu(bg
->bg_inode_table_lo
) |
107 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
108 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
111 __u32
ext4_free_blks_count(struct super_block
*sb
,
112 struct ext4_group_desc
*bg
)
114 return le16_to_cpu(bg
->bg_free_blocks_count_lo
) |
115 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
116 (__u32
)le16_to_cpu(bg
->bg_free_blocks_count_hi
) << 16 : 0);
119 __u32
ext4_free_inodes_count(struct super_block
*sb
,
120 struct ext4_group_desc
*bg
)
122 return le16_to_cpu(bg
->bg_free_inodes_count_lo
) |
123 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
124 (__u32
)le16_to_cpu(bg
->bg_free_inodes_count_hi
) << 16 : 0);
127 __u32
ext4_used_dirs_count(struct super_block
*sb
,
128 struct ext4_group_desc
*bg
)
130 return le16_to_cpu(bg
->bg_used_dirs_count_lo
) |
131 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
132 (__u32
)le16_to_cpu(bg
->bg_used_dirs_count_hi
) << 16 : 0);
135 __u32
ext4_itable_unused_count(struct super_block
*sb
,
136 struct ext4_group_desc
*bg
)
138 return le16_to_cpu(bg
->bg_itable_unused_lo
) |
139 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
140 (__u32
)le16_to_cpu(bg
->bg_itable_unused_hi
) << 16 : 0);
143 void ext4_block_bitmap_set(struct super_block
*sb
,
144 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
146 bg
->bg_block_bitmap_lo
= cpu_to_le32((u32
)blk
);
147 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
148 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
151 void ext4_inode_bitmap_set(struct super_block
*sb
,
152 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
154 bg
->bg_inode_bitmap_lo
= cpu_to_le32((u32
)blk
);
155 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
156 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
159 void ext4_inode_table_set(struct super_block
*sb
,
160 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
162 bg
->bg_inode_table_lo
= cpu_to_le32((u32
)blk
);
163 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
164 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
167 void ext4_free_blks_set(struct super_block
*sb
,
168 struct ext4_group_desc
*bg
, __u32 count
)
170 bg
->bg_free_blocks_count_lo
= cpu_to_le16((__u16
)count
);
171 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
172 bg
->bg_free_blocks_count_hi
= cpu_to_le16(count
>> 16);
175 void ext4_free_inodes_set(struct super_block
*sb
,
176 struct ext4_group_desc
*bg
, __u32 count
)
178 bg
->bg_free_inodes_count_lo
= cpu_to_le16((__u16
)count
);
179 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
180 bg
->bg_free_inodes_count_hi
= cpu_to_le16(count
>> 16);
183 void ext4_used_dirs_set(struct super_block
*sb
,
184 struct ext4_group_desc
*bg
, __u32 count
)
186 bg
->bg_used_dirs_count_lo
= cpu_to_le16((__u16
)count
);
187 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
188 bg
->bg_used_dirs_count_hi
= cpu_to_le16(count
>> 16);
191 void ext4_itable_unused_set(struct super_block
*sb
,
192 struct ext4_group_desc
*bg
, __u32 count
)
194 bg
->bg_itable_unused_lo
= cpu_to_le16((__u16
)count
);
195 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
196 bg
->bg_itable_unused_hi
= cpu_to_le16(count
>> 16);
200 /* Just increment the non-pointer handle value */
201 static handle_t
*ext4_get_nojournal(void)
203 handle_t
*handle
= current
->journal_info
;
204 unsigned long ref_cnt
= (unsigned long)handle
;
206 BUG_ON(ref_cnt
>= EXT4_NOJOURNAL_MAX_REF_COUNT
);
209 handle
= (handle_t
*)ref_cnt
;
211 current
->journal_info
= handle
;
216 /* Decrement the non-pointer handle value */
217 static void ext4_put_nojournal(handle_t
*handle
)
219 unsigned long ref_cnt
= (unsigned long)handle
;
221 BUG_ON(ref_cnt
== 0);
224 handle
= (handle_t
*)ref_cnt
;
226 current
->journal_info
= handle
;
230 * Wrappers for jbd2_journal_start/end.
232 * The only special thing we need to do here is to make sure that all
233 * journal_end calls result in the superblock being marked dirty, so
234 * that sync() will call the filesystem's write_super callback if
237 handle_t
*ext4_journal_start_sb(struct super_block
*sb
, int nblocks
)
241 if (sb
->s_flags
& MS_RDONLY
)
242 return ERR_PTR(-EROFS
);
244 vfs_check_frozen(sb
, SB_FREEZE_WRITE
);
245 /* Special case here: if the journal has aborted behind our
246 * backs (eg. EIO in the commit thread), then we still need to
247 * take the FS itself readonly cleanly. */
248 journal
= EXT4_SB(sb
)->s_journal
;
250 if (is_journal_aborted(journal
)) {
251 ext4_abort(sb
, __func__
, "Detected aborted journal");
252 return ERR_PTR(-EROFS
);
254 return jbd2_journal_start(journal
, nblocks
);
256 return ext4_get_nojournal();
260 * The only special thing we need to do here is to make sure that all
261 * jbd2_journal_stop calls result in the superblock being marked dirty, so
262 * that sync() will call the filesystem's write_super callback if
265 int __ext4_journal_stop(const char *where
, handle_t
*handle
)
267 struct super_block
*sb
;
271 if (!ext4_handle_valid(handle
)) {
272 ext4_put_nojournal(handle
);
275 sb
= handle
->h_transaction
->t_journal
->j_private
;
277 rc
= jbd2_journal_stop(handle
);
282 __ext4_std_error(sb
, where
, err
);
286 void ext4_journal_abort_handle(const char *caller
, const char *err_fn
,
287 struct buffer_head
*bh
, handle_t
*handle
, int err
)
290 const char *errstr
= ext4_decode_error(NULL
, err
, nbuf
);
292 BUG_ON(!ext4_handle_valid(handle
));
295 BUFFER_TRACE(bh
, "abort");
300 if (is_handle_aborted(handle
))
303 printk(KERN_ERR
"%s: aborting transaction: %s in %s\n",
304 caller
, errstr
, err_fn
);
306 jbd2_journal_abort_handle(handle
);
309 /* Deal with the reporting of failure conditions on a filesystem such as
310 * inconsistencies detected or read IO failures.
312 * On ext2, we can store the error state of the filesystem in the
313 * superblock. That is not possible on ext4, because we may have other
314 * write ordering constraints on the superblock which prevent us from
315 * writing it out straight away; and given that the journal is about to
316 * be aborted, we can't rely on the current, or future, transactions to
317 * write out the superblock safely.
319 * We'll just use the jbd2_journal_abort() error code to record an error in
320 * the journal instead. On recovery, the journal will complain about
321 * that error until we've noted it down and cleared it.
324 static void ext4_handle_error(struct super_block
*sb
)
326 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
328 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
329 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
331 if (sb
->s_flags
& MS_RDONLY
)
334 if (!test_opt(sb
, ERRORS_CONT
)) {
335 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
337 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
339 jbd2_journal_abort(journal
, -EIO
);
341 if (test_opt(sb
, ERRORS_RO
)) {
342 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
343 sb
->s_flags
|= MS_RDONLY
;
345 ext4_commit_super(sb
, 1);
346 if (test_opt(sb
, ERRORS_PANIC
))
347 panic("EXT4-fs (device %s): panic forced after error\n",
351 void __ext4_error(struct super_block
*sb
, const char *function
,
352 const char *fmt
, ...)
357 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
362 ext4_handle_error(sb
);
365 void ext4_error_inode(const char *function
, struct inode
*inode
,
366 const char *fmt
, ...)
371 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: inode #%lu: (comm %s) ",
372 inode
->i_sb
->s_id
, function
, inode
->i_ino
, current
->comm
);
377 ext4_handle_error(inode
->i_sb
);
380 void ext4_error_file(const char *function
, struct file
*file
,
381 const char *fmt
, ...)
384 struct inode
*inode
= file
->f_dentry
->d_inode
;
385 char pathname
[80], *path
;
388 path
= d_path(&(file
->f_path
), pathname
, sizeof(pathname
));
392 "EXT4-fs error (device %s): %s: inode #%lu (comm %s path %s): ",
393 inode
->i_sb
->s_id
, function
, inode
->i_ino
, current
->comm
, path
);
398 ext4_handle_error(inode
->i_sb
);
401 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
408 errstr
= "IO failure";
411 errstr
= "Out of memory";
414 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
415 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
416 errstr
= "Journal has aborted";
418 errstr
= "Readonly filesystem";
421 /* If the caller passed in an extra buffer for unknown
422 * errors, textualise them now. Else we just return
425 /* Check for truncated error codes... */
426 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
435 /* __ext4_std_error decodes expected errors from journaling functions
436 * automatically and invokes the appropriate error response. */
438 void __ext4_std_error(struct super_block
*sb
, const char *function
, int errno
)
443 /* Special case: if the error is EROFS, and we're not already
444 * inside a transaction, then there's really no point in logging
446 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
447 (sb
->s_flags
& MS_RDONLY
))
450 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
451 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s: %s\n",
452 sb
->s_id
, function
, errstr
);
454 ext4_handle_error(sb
);
458 * ext4_abort is a much stronger failure handler than ext4_error. The
459 * abort function may be used to deal with unrecoverable failures such
460 * as journal IO errors or ENOMEM at a critical moment in log management.
462 * We unconditionally force the filesystem into an ABORT|READONLY state,
463 * unless the error response on the fs has been set to panic in which
464 * case we take the easy way out and panic immediately.
467 void ext4_abort(struct super_block
*sb
, const char *function
,
468 const char *fmt
, ...)
473 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
478 if (test_opt(sb
, ERRORS_PANIC
))
479 panic("EXT4-fs panic from previous error\n");
481 if (sb
->s_flags
& MS_RDONLY
)
484 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
485 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
486 sb
->s_flags
|= MS_RDONLY
;
487 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
488 if (EXT4_SB(sb
)->s_journal
)
489 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
492 void ext4_msg (struct super_block
* sb
, const char *prefix
,
493 const char *fmt
, ...)
498 printk("%sEXT4-fs (%s): ", prefix
, sb
->s_id
);
504 void __ext4_warning(struct super_block
*sb
, const char *function
,
505 const char *fmt
, ...)
510 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s: ",
517 void ext4_grp_locked_error(struct super_block
*sb
, ext4_group_t grp
,
518 const char *function
, const char *fmt
, ...)
523 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
526 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
531 if (test_opt(sb
, ERRORS_CONT
)) {
532 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
533 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
534 ext4_commit_super(sb
, 0);
537 ext4_unlock_group(sb
, grp
);
538 ext4_handle_error(sb
);
540 * We only get here in the ERRORS_RO case; relocking the group
541 * may be dangerous, but nothing bad will happen since the
542 * filesystem will have already been marked read/only and the
543 * journal has been aborted. We return 1 as a hint to callers
544 * who might what to use the return value from
545 * ext4_grp_locked_error() to distinguish beween the
546 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
547 * aggressively from the ext4 function in question, with a
548 * more appropriate error code.
550 ext4_lock_group(sb
, grp
);
554 void ext4_update_dynamic_rev(struct super_block
*sb
)
556 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
558 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
562 "updating to rev %d because of new feature flag, "
563 "running e2fsck is recommended",
566 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
567 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
568 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
569 /* leave es->s_feature_*compat flags alone */
570 /* es->s_uuid will be set by e2fsck if empty */
573 * The rest of the superblock fields should be zero, and if not it
574 * means they are likely already in use, so leave them alone. We
575 * can leave it up to e2fsck to clean up any inconsistencies there.
580 * Open the external journal device
582 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
584 struct block_device
*bdev
;
585 char b
[BDEVNAME_SIZE
];
587 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
593 ext4_msg(sb
, KERN_ERR
, "failed to open journal device %s: %ld",
594 __bdevname(dev
, b
), PTR_ERR(bdev
));
599 * Release the journal device
601 static int ext4_blkdev_put(struct block_device
*bdev
)
604 return blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
607 static int ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
609 struct block_device
*bdev
;
612 bdev
= sbi
->journal_bdev
;
614 ret
= ext4_blkdev_put(bdev
);
615 sbi
->journal_bdev
= NULL
;
620 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
622 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
625 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
629 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
630 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
632 printk(KERN_ERR
"sb_info orphan list:\n");
633 list_for_each(l
, &sbi
->s_orphan
) {
634 struct inode
*inode
= orphan_list_entry(l
);
636 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
637 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
638 inode
->i_mode
, inode
->i_nlink
,
643 static void ext4_put_super(struct super_block
*sb
)
645 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
646 struct ext4_super_block
*es
= sbi
->s_es
;
649 dquot_disable(sb
, -1, DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
651 flush_workqueue(sbi
->dio_unwritten_wq
);
652 destroy_workqueue(sbi
->dio_unwritten_wq
);
657 ext4_commit_super(sb
, 1);
659 if (sbi
->s_journal
) {
660 err
= jbd2_journal_destroy(sbi
->s_journal
);
661 sbi
->s_journal
= NULL
;
663 ext4_abort(sb
, __func__
,
664 "Couldn't clean up the journal");
667 ext4_release_system_zone(sb
);
669 ext4_ext_release(sb
);
670 ext4_xattr_put_super(sb
);
672 if (!(sb
->s_flags
& MS_RDONLY
)) {
673 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
674 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
675 ext4_commit_super(sb
, 1);
678 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
680 kobject_del(&sbi
->s_kobj
);
682 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
683 brelse(sbi
->s_group_desc
[i
]);
684 kfree(sbi
->s_group_desc
);
685 if (is_vmalloc_addr(sbi
->s_flex_groups
))
686 vfree(sbi
->s_flex_groups
);
688 kfree(sbi
->s_flex_groups
);
689 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
690 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
691 percpu_counter_destroy(&sbi
->s_dirs_counter
);
692 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
695 for (i
= 0; i
< MAXQUOTAS
; i
++)
696 kfree(sbi
->s_qf_names
[i
]);
699 /* Debugging code just in case the in-memory inode orphan list
700 * isn't empty. The on-disk one can be non-empty if we've
701 * detected an error and taken the fs readonly, but the
702 * in-memory list had better be clean by this point. */
703 if (!list_empty(&sbi
->s_orphan
))
704 dump_orphan_list(sb
, sbi
);
705 J_ASSERT(list_empty(&sbi
->s_orphan
));
707 invalidate_bdev(sb
->s_bdev
);
708 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
710 * Invalidate the journal device's buffers. We don't want them
711 * floating about in memory - the physical journal device may
712 * hotswapped, and it breaks the `ro-after' testing code.
714 sync_blockdev(sbi
->journal_bdev
);
715 invalidate_bdev(sbi
->journal_bdev
);
716 ext4_blkdev_remove(sbi
);
718 sb
->s_fs_info
= NULL
;
720 * Now that we are completely done shutting down the
721 * superblock, we need to actually destroy the kobject.
725 kobject_put(&sbi
->s_kobj
);
726 wait_for_completion(&sbi
->s_kobj_unregister
);
727 kfree(sbi
->s_blockgroup_lock
);
731 static struct kmem_cache
*ext4_inode_cachep
;
734 * Called inside transaction, so use GFP_NOFS
736 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
738 struct ext4_inode_info
*ei
;
740 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
744 ei
->vfs_inode
.i_version
= 1;
745 ei
->vfs_inode
.i_data
.writeback_index
= 0;
746 memset(&ei
->i_cached_extent
, 0, sizeof(struct ext4_ext_cache
));
747 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
748 spin_lock_init(&ei
->i_prealloc_lock
);
750 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
751 * therefore it can be null here. Don't check it, just initialize
754 jbd2_journal_init_jbd_inode(&ei
->jinode
, &ei
->vfs_inode
);
755 ei
->i_reserved_data_blocks
= 0;
756 ei
->i_reserved_meta_blocks
= 0;
757 ei
->i_allocated_meta_blocks
= 0;
758 ei
->i_da_metadata_calc_len
= 0;
759 ei
->i_delalloc_reserved_flag
= 0;
760 spin_lock_init(&(ei
->i_block_reservation_lock
));
762 ei
->i_reserved_quota
= 0;
764 INIT_LIST_HEAD(&ei
->i_completed_io_list
);
765 spin_lock_init(&ei
->i_completed_io_lock
);
766 ei
->cur_aio_dio
= NULL
;
768 ei
->i_datasync_tid
= 0;
770 return &ei
->vfs_inode
;
773 static void ext4_destroy_inode(struct inode
*inode
)
775 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
776 ext4_msg(inode
->i_sb
, KERN_ERR
,
777 "Inode %lu (%p): orphan list check failed!",
778 inode
->i_ino
, EXT4_I(inode
));
779 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
780 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
784 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
787 static void init_once(void *foo
)
789 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
791 INIT_LIST_HEAD(&ei
->i_orphan
);
792 #ifdef CONFIG_EXT4_FS_XATTR
793 init_rwsem(&ei
->xattr_sem
);
795 init_rwsem(&ei
->i_data_sem
);
796 inode_init_once(&ei
->vfs_inode
);
799 static int init_inodecache(void)
801 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
802 sizeof(struct ext4_inode_info
),
803 0, (SLAB_RECLAIM_ACCOUNT
|
806 if (ext4_inode_cachep
== NULL
)
811 static void destroy_inodecache(void)
813 kmem_cache_destroy(ext4_inode_cachep
);
816 static void ext4_clear_inode(struct inode
*inode
)
819 ext4_discard_preallocations(inode
);
820 if (EXT4_JOURNAL(inode
))
821 jbd2_journal_release_jbd_inode(EXT4_SB(inode
->i_sb
)->s_journal
,
822 &EXT4_I(inode
)->jinode
);
825 static inline void ext4_show_quota_options(struct seq_file
*seq
,
826 struct super_block
*sb
)
828 #if defined(CONFIG_QUOTA)
829 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
831 if (sbi
->s_jquota_fmt
) {
834 switch (sbi
->s_jquota_fmt
) {
845 seq_printf(seq
, ",jqfmt=%s", fmtname
);
848 if (sbi
->s_qf_names
[USRQUOTA
])
849 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
851 if (sbi
->s_qf_names
[GRPQUOTA
])
852 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
854 if (test_opt(sb
, USRQUOTA
))
855 seq_puts(seq
, ",usrquota");
857 if (test_opt(sb
, GRPQUOTA
))
858 seq_puts(seq
, ",grpquota");
864 * - it's set to a non-default value OR
865 * - if the per-sb default is different from the global default
867 static int ext4_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
870 unsigned long def_mount_opts
;
871 struct super_block
*sb
= vfs
->mnt_sb
;
872 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
873 struct ext4_super_block
*es
= sbi
->s_es
;
875 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
876 def_errors
= le16_to_cpu(es
->s_errors
);
878 if (sbi
->s_sb_block
!= 1)
879 seq_printf(seq
, ",sb=%llu", sbi
->s_sb_block
);
880 if (test_opt(sb
, MINIX_DF
))
881 seq_puts(seq
, ",minixdf");
882 if (test_opt(sb
, GRPID
) && !(def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
883 seq_puts(seq
, ",grpid");
884 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
885 seq_puts(seq
, ",nogrpid");
886 if (sbi
->s_resuid
!= EXT4_DEF_RESUID
||
887 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
) {
888 seq_printf(seq
, ",resuid=%u", sbi
->s_resuid
);
890 if (sbi
->s_resgid
!= EXT4_DEF_RESGID
||
891 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
) {
892 seq_printf(seq
, ",resgid=%u", sbi
->s_resgid
);
894 if (test_opt(sb
, ERRORS_RO
)) {
895 if (def_errors
== EXT4_ERRORS_PANIC
||
896 def_errors
== EXT4_ERRORS_CONTINUE
) {
897 seq_puts(seq
, ",errors=remount-ro");
900 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
901 seq_puts(seq
, ",errors=continue");
902 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
903 seq_puts(seq
, ",errors=panic");
904 if (test_opt(sb
, NO_UID32
) && !(def_mount_opts
& EXT4_DEFM_UID16
))
905 seq_puts(seq
, ",nouid32");
906 if (test_opt(sb
, DEBUG
) && !(def_mount_opts
& EXT4_DEFM_DEBUG
))
907 seq_puts(seq
, ",debug");
908 if (test_opt(sb
, OLDALLOC
))
909 seq_puts(seq
, ",oldalloc");
910 #ifdef CONFIG_EXT4_FS_XATTR
911 if (test_opt(sb
, XATTR_USER
) &&
912 !(def_mount_opts
& EXT4_DEFM_XATTR_USER
))
913 seq_puts(seq
, ",user_xattr");
914 if (!test_opt(sb
, XATTR_USER
) &&
915 (def_mount_opts
& EXT4_DEFM_XATTR_USER
)) {
916 seq_puts(seq
, ",nouser_xattr");
919 #ifdef CONFIG_EXT4_FS_POSIX_ACL
920 if (test_opt(sb
, POSIX_ACL
) && !(def_mount_opts
& EXT4_DEFM_ACL
))
921 seq_puts(seq
, ",acl");
922 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT4_DEFM_ACL
))
923 seq_puts(seq
, ",noacl");
925 if (sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
) {
926 seq_printf(seq
, ",commit=%u",
927 (unsigned) (sbi
->s_commit_interval
/ HZ
));
929 if (sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
) {
930 seq_printf(seq
, ",min_batch_time=%u",
931 (unsigned) sbi
->s_min_batch_time
);
933 if (sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
) {
934 seq_printf(seq
, ",max_batch_time=%u",
935 (unsigned) sbi
->s_min_batch_time
);
939 * We're changing the default of barrier mount option, so
940 * let's always display its mount state so it's clear what its
943 seq_puts(seq
, ",barrier=");
944 seq_puts(seq
, test_opt(sb
, BARRIER
) ? "1" : "0");
945 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
))
946 seq_puts(seq
, ",journal_async_commit");
947 else if (test_opt(sb
, JOURNAL_CHECKSUM
))
948 seq_puts(seq
, ",journal_checksum");
949 if (test_opt(sb
, NOBH
))
950 seq_puts(seq
, ",nobh");
951 if (test_opt(sb
, I_VERSION
))
952 seq_puts(seq
, ",i_version");
953 if (!test_opt(sb
, DELALLOC
))
954 seq_puts(seq
, ",nodelalloc");
958 seq_printf(seq
, ",stripe=%lu", sbi
->s_stripe
);
960 * journal mode get enabled in different ways
961 * So just print the value even if we didn't specify it
963 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
964 seq_puts(seq
, ",data=journal");
965 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
966 seq_puts(seq
, ",data=ordered");
967 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
968 seq_puts(seq
, ",data=writeback");
970 if (sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
971 seq_printf(seq
, ",inode_readahead_blks=%u",
972 sbi
->s_inode_readahead_blks
);
974 if (test_opt(sb
, DATA_ERR_ABORT
))
975 seq_puts(seq
, ",data_err=abort");
977 if (test_opt(sb
, NO_AUTO_DA_ALLOC
))
978 seq_puts(seq
, ",noauto_da_alloc");
980 if (test_opt(sb
, DISCARD
))
981 seq_puts(seq
, ",discard");
983 if (test_opt(sb
, NOLOAD
))
984 seq_puts(seq
, ",norecovery");
986 if (test_opt(sb
, DIOREAD_NOLOCK
))
987 seq_puts(seq
, ",dioread_nolock");
989 ext4_show_quota_options(seq
, sb
);
994 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
995 u64 ino
, u32 generation
)
999 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
1000 return ERR_PTR(-ESTALE
);
1001 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
1002 return ERR_PTR(-ESTALE
);
1004 /* iget isn't really right if the inode is currently unallocated!!
1006 * ext4_read_inode will return a bad_inode if the inode had been
1007 * deleted, so we should be safe.
1009 * Currently we don't know the generation for parent directory, so
1010 * a generation of 0 means "accept any"
1012 inode
= ext4_iget(sb
, ino
);
1014 return ERR_CAST(inode
);
1015 if (generation
&& inode
->i_generation
!= generation
) {
1017 return ERR_PTR(-ESTALE
);
1023 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
1024 int fh_len
, int fh_type
)
1026 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
1027 ext4_nfs_get_inode
);
1030 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
1031 int fh_len
, int fh_type
)
1033 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
1034 ext4_nfs_get_inode
);
1038 * Try to release metadata pages (indirect blocks, directories) which are
1039 * mapped via the block device. Since these pages could have journal heads
1040 * which would prevent try_to_free_buffers() from freeing them, we must use
1041 * jbd2 layer's try_to_free_buffers() function to release them.
1043 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
1046 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
1048 WARN_ON(PageChecked(page
));
1049 if (!page_has_buffers(page
))
1052 return jbd2_journal_try_to_free_buffers(journal
, page
,
1053 wait
& ~__GFP_WAIT
);
1054 return try_to_free_buffers(page
);
1058 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1059 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1061 static int ext4_write_dquot(struct dquot
*dquot
);
1062 static int ext4_acquire_dquot(struct dquot
*dquot
);
1063 static int ext4_release_dquot(struct dquot
*dquot
);
1064 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1065 static int ext4_write_info(struct super_block
*sb
, int type
);
1066 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1068 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1069 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1070 size_t len
, loff_t off
);
1071 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1072 const char *data
, size_t len
, loff_t off
);
1074 static const struct dquot_operations ext4_quota_operations
= {
1076 .get_reserved_space
= ext4_get_reserved_space
,
1078 .write_dquot
= ext4_write_dquot
,
1079 .acquire_dquot
= ext4_acquire_dquot
,
1080 .release_dquot
= ext4_release_dquot
,
1081 .mark_dirty
= ext4_mark_dquot_dirty
,
1082 .write_info
= ext4_write_info
,
1083 .alloc_dquot
= dquot_alloc
,
1084 .destroy_dquot
= dquot_destroy
,
1087 static const struct quotactl_ops ext4_qctl_operations
= {
1088 .quota_on
= ext4_quota_on
,
1089 .quota_off
= dquot_quota_off
,
1090 .quota_sync
= dquot_quota_sync
,
1091 .get_info
= dquot_get_dqinfo
,
1092 .set_info
= dquot_set_dqinfo
,
1093 .get_dqblk
= dquot_get_dqblk
,
1094 .set_dqblk
= dquot_set_dqblk
1098 static const struct super_operations ext4_sops
= {
1099 .alloc_inode
= ext4_alloc_inode
,
1100 .destroy_inode
= ext4_destroy_inode
,
1101 .write_inode
= ext4_write_inode
,
1102 .dirty_inode
= ext4_dirty_inode
,
1103 .delete_inode
= ext4_delete_inode
,
1104 .put_super
= ext4_put_super
,
1105 .sync_fs
= ext4_sync_fs
,
1106 .freeze_fs
= ext4_freeze
,
1107 .unfreeze_fs
= ext4_unfreeze
,
1108 .statfs
= ext4_statfs
,
1109 .remount_fs
= ext4_remount
,
1110 .clear_inode
= ext4_clear_inode
,
1111 .show_options
= ext4_show_options
,
1113 .quota_read
= ext4_quota_read
,
1114 .quota_write
= ext4_quota_write
,
1116 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1119 static const struct super_operations ext4_nojournal_sops
= {
1120 .alloc_inode
= ext4_alloc_inode
,
1121 .destroy_inode
= ext4_destroy_inode
,
1122 .write_inode
= ext4_write_inode
,
1123 .dirty_inode
= ext4_dirty_inode
,
1124 .delete_inode
= ext4_delete_inode
,
1125 .write_super
= ext4_write_super
,
1126 .put_super
= ext4_put_super
,
1127 .statfs
= ext4_statfs
,
1128 .remount_fs
= ext4_remount
,
1129 .clear_inode
= ext4_clear_inode
,
1130 .show_options
= ext4_show_options
,
1132 .quota_read
= ext4_quota_read
,
1133 .quota_write
= ext4_quota_write
,
1135 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1138 static const struct export_operations ext4_export_ops
= {
1139 .fh_to_dentry
= ext4_fh_to_dentry
,
1140 .fh_to_parent
= ext4_fh_to_parent
,
1141 .get_parent
= ext4_get_parent
,
1145 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1146 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1147 Opt_nouid32
, Opt_debug
, Opt_oldalloc
, Opt_orlov
,
1148 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1149 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
, Opt_nobh
, Opt_bh
,
1150 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
,
1151 Opt_journal_update
, Opt_journal_dev
,
1152 Opt_journal_checksum
, Opt_journal_async_commit
,
1153 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1154 Opt_data_err_abort
, Opt_data_err_ignore
,
1155 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1156 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1157 Opt_noquota
, Opt_ignore
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1158 Opt_resize
, Opt_usrquota
, Opt_grpquota
, Opt_i_version
,
1159 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
,
1160 Opt_block_validity
, Opt_noblock_validity
,
1161 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1162 Opt_dioread_nolock
, Opt_dioread_lock
,
1163 Opt_discard
, Opt_nodiscard
,
1166 static const match_table_t tokens
= {
1167 {Opt_bsd_df
, "bsddf"},
1168 {Opt_minix_df
, "minixdf"},
1169 {Opt_grpid
, "grpid"},
1170 {Opt_grpid
, "bsdgroups"},
1171 {Opt_nogrpid
, "nogrpid"},
1172 {Opt_nogrpid
, "sysvgroups"},
1173 {Opt_resgid
, "resgid=%u"},
1174 {Opt_resuid
, "resuid=%u"},
1176 {Opt_err_cont
, "errors=continue"},
1177 {Opt_err_panic
, "errors=panic"},
1178 {Opt_err_ro
, "errors=remount-ro"},
1179 {Opt_nouid32
, "nouid32"},
1180 {Opt_debug
, "debug"},
1181 {Opt_oldalloc
, "oldalloc"},
1182 {Opt_orlov
, "orlov"},
1183 {Opt_user_xattr
, "user_xattr"},
1184 {Opt_nouser_xattr
, "nouser_xattr"},
1186 {Opt_noacl
, "noacl"},
1187 {Opt_noload
, "noload"},
1188 {Opt_noload
, "norecovery"},
1191 {Opt_commit
, "commit=%u"},
1192 {Opt_min_batch_time
, "min_batch_time=%u"},
1193 {Opt_max_batch_time
, "max_batch_time=%u"},
1194 {Opt_journal_update
, "journal=update"},
1195 {Opt_journal_dev
, "journal_dev=%u"},
1196 {Opt_journal_checksum
, "journal_checksum"},
1197 {Opt_journal_async_commit
, "journal_async_commit"},
1198 {Opt_abort
, "abort"},
1199 {Opt_data_journal
, "data=journal"},
1200 {Opt_data_ordered
, "data=ordered"},
1201 {Opt_data_writeback
, "data=writeback"},
1202 {Opt_data_err_abort
, "data_err=abort"},
1203 {Opt_data_err_ignore
, "data_err=ignore"},
1204 {Opt_offusrjquota
, "usrjquota="},
1205 {Opt_usrjquota
, "usrjquota=%s"},
1206 {Opt_offgrpjquota
, "grpjquota="},
1207 {Opt_grpjquota
, "grpjquota=%s"},
1208 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1209 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1210 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1211 {Opt_grpquota
, "grpquota"},
1212 {Opt_noquota
, "noquota"},
1213 {Opt_quota
, "quota"},
1214 {Opt_usrquota
, "usrquota"},
1215 {Opt_barrier
, "barrier=%u"},
1216 {Opt_barrier
, "barrier"},
1217 {Opt_nobarrier
, "nobarrier"},
1218 {Opt_i_version
, "i_version"},
1219 {Opt_stripe
, "stripe=%u"},
1220 {Opt_resize
, "resize"},
1221 {Opt_delalloc
, "delalloc"},
1222 {Opt_nodelalloc
, "nodelalloc"},
1223 {Opt_block_validity
, "block_validity"},
1224 {Opt_noblock_validity
, "noblock_validity"},
1225 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1226 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1227 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1228 {Opt_auto_da_alloc
, "auto_da_alloc"},
1229 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1230 {Opt_dioread_nolock
, "dioread_nolock"},
1231 {Opt_dioread_lock
, "dioread_lock"},
1232 {Opt_discard
, "discard"},
1233 {Opt_nodiscard
, "nodiscard"},
1237 static ext4_fsblk_t
get_sb_block(void **data
)
1239 ext4_fsblk_t sb_block
;
1240 char *options
= (char *) *data
;
1242 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1243 return 1; /* Default location */
1246 /* TODO: use simple_strtoll with >32bit ext4 */
1247 sb_block
= simple_strtoul(options
, &options
, 0);
1248 if (*options
&& *options
!= ',') {
1249 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1253 if (*options
== ',')
1255 *data
= (void *) options
;
1260 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1261 static char deprecated_msg
[] = "Mount option \"%s\" will be removed by %s\n"
1262 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1265 static int set_qf_name(struct super_block
*sb
, int qtype
, substring_t
*args
)
1267 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1270 if (sb_any_quota_loaded(sb
) &&
1271 !sbi
->s_qf_names
[qtype
]) {
1272 ext4_msg(sb
, KERN_ERR
,
1273 "Cannot change journaled "
1274 "quota options when quota turned on");
1277 qname
= match_strdup(args
);
1279 ext4_msg(sb
, KERN_ERR
,
1280 "Not enough memory for storing quotafile name");
1283 if (sbi
->s_qf_names
[qtype
] &&
1284 strcmp(sbi
->s_qf_names
[qtype
], qname
)) {
1285 ext4_msg(sb
, KERN_ERR
,
1286 "%s quota file already specified", QTYPE2NAME(qtype
));
1290 sbi
->s_qf_names
[qtype
] = qname
;
1291 if (strchr(sbi
->s_qf_names
[qtype
], '/')) {
1292 ext4_msg(sb
, KERN_ERR
,
1293 "quotafile must be on filesystem root");
1294 kfree(sbi
->s_qf_names
[qtype
]);
1295 sbi
->s_qf_names
[qtype
] = NULL
;
1298 set_opt(sbi
->s_mount_opt
, QUOTA
);
1302 static int clear_qf_name(struct super_block
*sb
, int qtype
)
1305 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1307 if (sb_any_quota_loaded(sb
) &&
1308 sbi
->s_qf_names
[qtype
]) {
1309 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled quota options"
1310 " when quota turned on");
1314 * The space will be released later when all options are confirmed
1317 sbi
->s_qf_names
[qtype
] = NULL
;
1322 static int parse_options(char *options
, struct super_block
*sb
,
1323 unsigned long *journal_devnum
,
1324 unsigned int *journal_ioprio
,
1325 ext4_fsblk_t
*n_blocks_count
, int is_remount
)
1327 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1329 substring_t args
[MAX_OPT_ARGS
];
1339 while ((p
= strsep(&options
, ",")) != NULL
) {
1345 * Initialize args struct so we know whether arg was
1346 * found; some options take optional arguments.
1348 args
[0].to
= args
[0].from
= 0;
1349 token
= match_token(p
, tokens
, args
);
1352 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1353 clear_opt(sbi
->s_mount_opt
, MINIX_DF
);
1356 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1357 set_opt(sbi
->s_mount_opt
, MINIX_DF
);
1361 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1362 set_opt(sbi
->s_mount_opt
, GRPID
);
1366 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1367 clear_opt(sbi
->s_mount_opt
, GRPID
);
1371 if (match_int(&args
[0], &option
))
1373 sbi
->s_resuid
= option
;
1376 if (match_int(&args
[0], &option
))
1378 sbi
->s_resgid
= option
;
1381 /* handled by get_sb_block() instead of here */
1382 /* *sb_block = match_int(&args[0]); */
1385 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1386 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1387 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1390 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1391 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1392 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1395 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1396 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1397 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1400 set_opt(sbi
->s_mount_opt
, NO_UID32
);
1403 set_opt(sbi
->s_mount_opt
, DEBUG
);
1406 set_opt(sbi
->s_mount_opt
, OLDALLOC
);
1409 clear_opt(sbi
->s_mount_opt
, OLDALLOC
);
1411 #ifdef CONFIG_EXT4_FS_XATTR
1412 case Opt_user_xattr
:
1413 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
1415 case Opt_nouser_xattr
:
1416 clear_opt(sbi
->s_mount_opt
, XATTR_USER
);
1419 case Opt_user_xattr
:
1420 case Opt_nouser_xattr
:
1421 ext4_msg(sb
, KERN_ERR
, "(no)user_xattr options not supported");
1424 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1426 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1429 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1434 ext4_msg(sb
, KERN_ERR
, "(no)acl options not supported");
1437 case Opt_journal_update
:
1439 /* Eventually we will want to be able to create
1440 a journal file here. For now, only allow the
1441 user to specify an existing inode to be the
1444 ext4_msg(sb
, KERN_ERR
,
1445 "Cannot specify journal on remount");
1448 set_opt(sbi
->s_mount_opt
, UPDATE_JOURNAL
);
1450 case Opt_journal_dev
:
1452 ext4_msg(sb
, KERN_ERR
,
1453 "Cannot specify journal on remount");
1456 if (match_int(&args
[0], &option
))
1458 *journal_devnum
= option
;
1460 case Opt_journal_checksum
:
1461 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1463 case Opt_journal_async_commit
:
1464 set_opt(sbi
->s_mount_opt
, JOURNAL_ASYNC_COMMIT
);
1465 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1468 set_opt(sbi
->s_mount_opt
, NOLOAD
);
1471 if (match_int(&args
[0], &option
))
1476 option
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1477 sbi
->s_commit_interval
= HZ
* option
;
1479 case Opt_max_batch_time
:
1480 if (match_int(&args
[0], &option
))
1485 option
= EXT4_DEF_MAX_BATCH_TIME
;
1486 sbi
->s_max_batch_time
= option
;
1488 case Opt_min_batch_time
:
1489 if (match_int(&args
[0], &option
))
1493 sbi
->s_min_batch_time
= option
;
1495 case Opt_data_journal
:
1496 data_opt
= EXT4_MOUNT_JOURNAL_DATA
;
1498 case Opt_data_ordered
:
1499 data_opt
= EXT4_MOUNT_ORDERED_DATA
;
1501 case Opt_data_writeback
:
1502 data_opt
= EXT4_MOUNT_WRITEBACK_DATA
;
1505 if (test_opt(sb
, DATA_FLAGS
) != data_opt
) {
1506 ext4_msg(sb
, KERN_ERR
,
1507 "Cannot change data mode on remount");
1511 clear_opt(sbi
->s_mount_opt
, DATA_FLAGS
);
1512 sbi
->s_mount_opt
|= data_opt
;
1515 case Opt_data_err_abort
:
1516 set_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1518 case Opt_data_err_ignore
:
1519 clear_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1523 if (!set_qf_name(sb
, USRQUOTA
, &args
[0]))
1527 if (!set_qf_name(sb
, GRPQUOTA
, &args
[0]))
1530 case Opt_offusrjquota
:
1531 if (!clear_qf_name(sb
, USRQUOTA
))
1534 case Opt_offgrpjquota
:
1535 if (!clear_qf_name(sb
, GRPQUOTA
))
1539 case Opt_jqfmt_vfsold
:
1540 qfmt
= QFMT_VFS_OLD
;
1542 case Opt_jqfmt_vfsv0
:
1545 case Opt_jqfmt_vfsv1
:
1548 if (sb_any_quota_loaded(sb
) &&
1549 sbi
->s_jquota_fmt
!= qfmt
) {
1550 ext4_msg(sb
, KERN_ERR
, "Cannot change "
1551 "journaled quota options when "
1555 sbi
->s_jquota_fmt
= qfmt
;
1559 set_opt(sbi
->s_mount_opt
, QUOTA
);
1560 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
1563 set_opt(sbi
->s_mount_opt
, QUOTA
);
1564 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1567 if (sb_any_quota_loaded(sb
)) {
1568 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1569 "options when quota turned on");
1572 clear_opt(sbi
->s_mount_opt
, QUOTA
);
1573 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1574 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1580 ext4_msg(sb
, KERN_ERR
,
1581 "quota options not supported");
1585 case Opt_offusrjquota
:
1586 case Opt_offgrpjquota
:
1587 case Opt_jqfmt_vfsold
:
1588 case Opt_jqfmt_vfsv0
:
1589 case Opt_jqfmt_vfsv1
:
1590 ext4_msg(sb
, KERN_ERR
,
1591 "journaled quota options not supported");
1597 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1600 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1604 if (match_int(&args
[0], &option
))
1607 option
= 1; /* No argument, default to 1 */
1609 set_opt(sbi
->s_mount_opt
, BARRIER
);
1611 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1617 ext4_msg(sb
, KERN_ERR
,
1618 "resize option only available "
1622 if (match_int(&args
[0], &option
) != 0)
1624 *n_blocks_count
= option
;
1627 set_opt(sbi
->s_mount_opt
, NOBH
);
1630 clear_opt(sbi
->s_mount_opt
, NOBH
);
1633 set_opt(sbi
->s_mount_opt
, I_VERSION
);
1634 sb
->s_flags
|= MS_I_VERSION
;
1636 case Opt_nodelalloc
:
1637 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
1640 if (match_int(&args
[0], &option
))
1644 sbi
->s_stripe
= option
;
1647 set_opt(sbi
->s_mount_opt
, DELALLOC
);
1649 case Opt_block_validity
:
1650 set_opt(sbi
->s_mount_opt
, BLOCK_VALIDITY
);
1652 case Opt_noblock_validity
:
1653 clear_opt(sbi
->s_mount_opt
, BLOCK_VALIDITY
);
1655 case Opt_inode_readahead_blks
:
1656 if (match_int(&args
[0], &option
))
1658 if (option
< 0 || option
> (1 << 30))
1660 if (!is_power_of_2(option
)) {
1661 ext4_msg(sb
, KERN_ERR
,
1662 "EXT4-fs: inode_readahead_blks"
1663 " must be a power of 2");
1666 sbi
->s_inode_readahead_blks
= option
;
1668 case Opt_journal_ioprio
:
1669 if (match_int(&args
[0], &option
))
1671 if (option
< 0 || option
> 7)
1673 *journal_ioprio
= IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
,
1676 case Opt_noauto_da_alloc
:
1677 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1679 case Opt_auto_da_alloc
:
1681 if (match_int(&args
[0], &option
))
1684 option
= 1; /* No argument, default to 1 */
1686 clear_opt(sbi
->s_mount_opt
, NO_AUTO_DA_ALLOC
);
1688 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1691 set_opt(sbi
->s_mount_opt
, DISCARD
);
1694 clear_opt(sbi
->s_mount_opt
, DISCARD
);
1696 case Opt_dioread_nolock
:
1697 set_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
1699 case Opt_dioread_lock
:
1700 clear_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
1703 ext4_msg(sb
, KERN_ERR
,
1704 "Unrecognized mount option \"%s\" "
1705 "or missing value", p
);
1710 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1711 if (test_opt(sb
, USRQUOTA
) && sbi
->s_qf_names
[USRQUOTA
])
1712 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1714 if (test_opt(sb
, GRPQUOTA
) && sbi
->s_qf_names
[GRPQUOTA
])
1715 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1717 if (test_opt(sb
, GRPQUOTA
) || test_opt(sb
, USRQUOTA
)) {
1718 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1723 if (!sbi
->s_jquota_fmt
) {
1724 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1729 if (sbi
->s_jquota_fmt
) {
1730 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1731 "specified with no journaling "
1740 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1743 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1746 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1747 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
1748 "forcing read-only mode");
1753 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1754 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
1755 "running e2fsck is recommended");
1756 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1757 ext4_msg(sb
, KERN_WARNING
,
1758 "warning: mounting fs with errors, "
1759 "running e2fsck is recommended");
1760 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
1761 le16_to_cpu(es
->s_mnt_count
) >=
1762 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1763 ext4_msg(sb
, KERN_WARNING
,
1764 "warning: maximal mount count reached, "
1765 "running e2fsck is recommended");
1766 else if (le32_to_cpu(es
->s_checkinterval
) &&
1767 (le32_to_cpu(es
->s_lastcheck
) +
1768 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1769 ext4_msg(sb
, KERN_WARNING
,
1770 "warning: checktime reached, "
1771 "running e2fsck is recommended");
1772 if (!sbi
->s_journal
)
1773 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1774 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1775 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1776 le16_add_cpu(&es
->s_mnt_count
, 1);
1777 es
->s_mtime
= cpu_to_le32(get_seconds());
1778 ext4_update_dynamic_rev(sb
);
1780 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1782 ext4_commit_super(sb
, 1);
1783 if (test_opt(sb
, DEBUG
))
1784 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
1785 "bpg=%lu, ipg=%lu, mo=%04x]\n",
1787 sbi
->s_groups_count
,
1788 EXT4_BLOCKS_PER_GROUP(sb
),
1789 EXT4_INODES_PER_GROUP(sb
),
1795 static int ext4_fill_flex_info(struct super_block
*sb
)
1797 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1798 struct ext4_group_desc
*gdp
= NULL
;
1799 ext4_group_t flex_group_count
;
1800 ext4_group_t flex_group
;
1801 int groups_per_flex
= 0;
1805 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1806 groups_per_flex
= 1 << sbi
->s_log_groups_per_flex
;
1808 if (groups_per_flex
< 2) {
1809 sbi
->s_log_groups_per_flex
= 0;
1813 /* We allocate both existing and potentially added groups */
1814 flex_group_count
= ((sbi
->s_groups_count
+ groups_per_flex
- 1) +
1815 ((le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
) + 1) <<
1816 EXT4_DESC_PER_BLOCK_BITS(sb
))) / groups_per_flex
;
1817 size
= flex_group_count
* sizeof(struct flex_groups
);
1818 sbi
->s_flex_groups
= kzalloc(size
, GFP_KERNEL
);
1819 if (sbi
->s_flex_groups
== NULL
) {
1820 sbi
->s_flex_groups
= vmalloc(size
);
1821 if (sbi
->s_flex_groups
)
1822 memset(sbi
->s_flex_groups
, 0, size
);
1824 if (sbi
->s_flex_groups
== NULL
) {
1825 ext4_msg(sb
, KERN_ERR
, "not enough memory for "
1826 "%u flex groups", flex_group_count
);
1830 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1831 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1833 flex_group
= ext4_flex_group(sbi
, i
);
1834 atomic_add(ext4_free_inodes_count(sb
, gdp
),
1835 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
1836 atomic_add(ext4_free_blks_count(sb
, gdp
),
1837 &sbi
->s_flex_groups
[flex_group
].free_blocks
);
1838 atomic_add(ext4_used_dirs_count(sb
, gdp
),
1839 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
1847 __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
1848 struct ext4_group_desc
*gdp
)
1852 if (sbi
->s_es
->s_feature_ro_compat
&
1853 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) {
1854 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
1855 __le32 le_group
= cpu_to_le32(block_group
);
1857 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
1858 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
1859 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
1860 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
1861 /* for checksum of struct ext4_group_desc do the rest...*/
1862 if ((sbi
->s_es
->s_feature_incompat
&
1863 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
1864 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
1865 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
1866 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
1870 return cpu_to_le16(crc
);
1873 int ext4_group_desc_csum_verify(struct ext4_sb_info
*sbi
, __u32 block_group
,
1874 struct ext4_group_desc
*gdp
)
1876 if ((sbi
->s_es
->s_feature_ro_compat
&
1877 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) &&
1878 (gdp
->bg_checksum
!= ext4_group_desc_csum(sbi
, block_group
, gdp
)))
1884 /* Called at mount-time, super-block is locked */
1885 static int ext4_check_descriptors(struct super_block
*sb
)
1887 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1888 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
1889 ext4_fsblk_t last_block
;
1890 ext4_fsblk_t block_bitmap
;
1891 ext4_fsblk_t inode_bitmap
;
1892 ext4_fsblk_t inode_table
;
1893 int flexbg_flag
= 0;
1896 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
1899 ext4_debug("Checking group descriptors");
1901 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1902 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1904 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
1905 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
1907 last_block
= first_block
+
1908 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
1910 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
1911 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
1912 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1913 "Block bitmap for group %u not in group "
1914 "(block %llu)!", i
, block_bitmap
);
1917 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
1918 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
1919 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1920 "Inode bitmap for group %u not in group "
1921 "(block %llu)!", i
, inode_bitmap
);
1924 inode_table
= ext4_inode_table(sb
, gdp
);
1925 if (inode_table
< first_block
||
1926 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
1927 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1928 "Inode table for group %u not in group "
1929 "(block %llu)!", i
, inode_table
);
1932 ext4_lock_group(sb
, i
);
1933 if (!ext4_group_desc_csum_verify(sbi
, i
, gdp
)) {
1934 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1935 "Checksum for group %u failed (%u!=%u)",
1936 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
1937 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
1938 if (!(sb
->s_flags
& MS_RDONLY
)) {
1939 ext4_unlock_group(sb
, i
);
1943 ext4_unlock_group(sb
, i
);
1945 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
1948 ext4_free_blocks_count_set(sbi
->s_es
, ext4_count_free_blocks(sb
));
1949 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
1953 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1954 * the superblock) which were deleted from all directories, but held open by
1955 * a process at the time of a crash. We walk the list and try to delete these
1956 * inodes at recovery time (only with a read-write filesystem).
1958 * In order to keep the orphan inode chain consistent during traversal (in
1959 * case of crash during recovery), we link each inode into the superblock
1960 * orphan list_head and handle it the same way as an inode deletion during
1961 * normal operation (which journals the operations for us).
1963 * We only do an iget() and an iput() on each inode, which is very safe if we
1964 * accidentally point at an in-use or already deleted inode. The worst that
1965 * can happen in this case is that we get a "bit already cleared" message from
1966 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1967 * e2fsck was run on this filesystem, and it must have already done the orphan
1968 * inode cleanup for us, so we can safely abort without any further action.
1970 static void ext4_orphan_cleanup(struct super_block
*sb
,
1971 struct ext4_super_block
*es
)
1973 unsigned int s_flags
= sb
->s_flags
;
1974 int nr_orphans
= 0, nr_truncates
= 0;
1978 if (!es
->s_last_orphan
) {
1979 jbd_debug(4, "no orphan inodes to clean up\n");
1983 if (bdev_read_only(sb
->s_bdev
)) {
1984 ext4_msg(sb
, KERN_ERR
, "write access "
1985 "unavailable, skipping orphan cleanup");
1989 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
1990 if (es
->s_last_orphan
)
1991 jbd_debug(1, "Errors on filesystem, "
1992 "clearing orphan list.\n");
1993 es
->s_last_orphan
= 0;
1994 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1998 if (s_flags
& MS_RDONLY
) {
1999 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
2000 sb
->s_flags
&= ~MS_RDONLY
;
2003 /* Needed for iput() to work correctly and not trash data */
2004 sb
->s_flags
|= MS_ACTIVE
;
2005 /* Turn on quotas so that they are updated correctly */
2006 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2007 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
2008 int ret
= ext4_quota_on_mount(sb
, i
);
2010 ext4_msg(sb
, KERN_ERR
,
2011 "Cannot turn on journaled "
2012 "quota: error %d", ret
);
2017 while (es
->s_last_orphan
) {
2018 struct inode
*inode
;
2020 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
2021 if (IS_ERR(inode
)) {
2022 es
->s_last_orphan
= 0;
2026 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
2027 dquot_initialize(inode
);
2028 if (inode
->i_nlink
) {
2029 ext4_msg(sb
, KERN_DEBUG
,
2030 "%s: truncating inode %lu to %lld bytes",
2031 __func__
, inode
->i_ino
, inode
->i_size
);
2032 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2033 inode
->i_ino
, inode
->i_size
);
2034 ext4_truncate(inode
);
2037 ext4_msg(sb
, KERN_DEBUG
,
2038 "%s: deleting unreferenced inode %lu",
2039 __func__
, inode
->i_ino
);
2040 jbd_debug(2, "deleting unreferenced inode %lu\n",
2044 iput(inode
); /* The delete magic happens here! */
2047 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2050 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
2051 PLURAL(nr_orphans
));
2053 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
2054 PLURAL(nr_truncates
));
2056 /* Turn quotas off */
2057 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2058 if (sb_dqopt(sb
)->files
[i
])
2059 dquot_quota_off(sb
, i
);
2062 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
2066 * Maximal extent format file size.
2067 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2068 * extent format containers, within a sector_t, and within i_blocks
2069 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2070 * so that won't be a limiting factor.
2072 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2074 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
2077 loff_t upper_limit
= MAX_LFS_FILESIZE
;
2079 /* small i_blocks in vfs inode? */
2080 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2082 * CONFIG_LBDAF is not enabled implies the inode
2083 * i_block represent total blocks in 512 bytes
2084 * 32 == size of vfs inode i_blocks * 8
2086 upper_limit
= (1LL << 32) - 1;
2088 /* total blocks in file system block size */
2089 upper_limit
>>= (blkbits
- 9);
2090 upper_limit
<<= blkbits
;
2093 /* 32-bit extent-start container, ee_block */
2098 /* Sanity check against vm- & vfs- imposed limits */
2099 if (res
> upper_limit
)
2106 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2107 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2108 * We need to be 1 filesystem block less than the 2^48 sector limit.
2110 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2112 loff_t res
= EXT4_NDIR_BLOCKS
;
2115 /* This is calculated to be the largest file size for a dense, block
2116 * mapped file such that the file's total number of 512-byte sectors,
2117 * including data and all indirect blocks, does not exceed (2^48 - 1).
2119 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2120 * number of 512-byte sectors of the file.
2123 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2125 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2126 * the inode i_block field represents total file blocks in
2127 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2129 upper_limit
= (1LL << 32) - 1;
2131 /* total blocks in file system block size */
2132 upper_limit
>>= (bits
- 9);
2136 * We use 48 bit ext4_inode i_blocks
2137 * With EXT4_HUGE_FILE_FL set the i_blocks
2138 * represent total number of blocks in
2139 * file system block size
2141 upper_limit
= (1LL << 48) - 1;
2145 /* indirect blocks */
2147 /* double indirect blocks */
2148 meta_blocks
+= 1 + (1LL << (bits
-2));
2149 /* tripple indirect blocks */
2150 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2152 upper_limit
-= meta_blocks
;
2153 upper_limit
<<= bits
;
2155 res
+= 1LL << (bits
-2);
2156 res
+= 1LL << (2*(bits
-2));
2157 res
+= 1LL << (3*(bits
-2));
2159 if (res
> upper_limit
)
2162 if (res
> MAX_LFS_FILESIZE
)
2163 res
= MAX_LFS_FILESIZE
;
2168 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2169 ext4_fsblk_t logical_sb_block
, int nr
)
2171 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2172 ext4_group_t bg
, first_meta_bg
;
2175 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2177 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
2179 return logical_sb_block
+ nr
+ 1;
2180 bg
= sbi
->s_desc_per_block
* nr
;
2181 if (ext4_bg_has_super(sb
, bg
))
2184 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2188 * ext4_get_stripe_size: Get the stripe size.
2189 * @sbi: In memory super block info
2191 * If we have specified it via mount option, then
2192 * use the mount option value. If the value specified at mount time is
2193 * greater than the blocks per group use the super block value.
2194 * If the super block value is greater than blocks per group return 0.
2195 * Allocator needs it be less than blocks per group.
2198 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2200 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2201 unsigned long stripe_width
=
2202 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2204 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2205 return sbi
->s_stripe
;
2207 if (stripe_width
<= sbi
->s_blocks_per_group
)
2208 return stripe_width
;
2210 if (stride
<= sbi
->s_blocks_per_group
)
2219 struct attribute attr
;
2220 ssize_t (*show
)(struct ext4_attr
*, struct ext4_sb_info
*, char *);
2221 ssize_t (*store
)(struct ext4_attr
*, struct ext4_sb_info
*,
2222 const char *, size_t);
2226 static int parse_strtoul(const char *buf
,
2227 unsigned long max
, unsigned long *value
)
2231 *value
= simple_strtoul(skip_spaces(buf
), &endp
, 0);
2232 endp
= skip_spaces(endp
);
2233 if (*endp
|| *value
> max
)
2239 static ssize_t
delayed_allocation_blocks_show(struct ext4_attr
*a
,
2240 struct ext4_sb_info
*sbi
,
2243 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2244 (s64
) percpu_counter_sum(&sbi
->s_dirtyblocks_counter
));
2247 static ssize_t
session_write_kbytes_show(struct ext4_attr
*a
,
2248 struct ext4_sb_info
*sbi
, char *buf
)
2250 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2252 return snprintf(buf
, PAGE_SIZE
, "%lu\n",
2253 (part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2254 sbi
->s_sectors_written_start
) >> 1);
2257 static ssize_t
lifetime_write_kbytes_show(struct ext4_attr
*a
,
2258 struct ext4_sb_info
*sbi
, char *buf
)
2260 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2262 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2263 (unsigned long long)(sbi
->s_kbytes_written
+
2264 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2265 EXT4_SB(sb
)->s_sectors_written_start
) >> 1)));
2268 static ssize_t
inode_readahead_blks_store(struct ext4_attr
*a
,
2269 struct ext4_sb_info
*sbi
,
2270 const char *buf
, size_t count
)
2274 if (parse_strtoul(buf
, 0x40000000, &t
))
2277 if (!is_power_of_2(t
))
2280 sbi
->s_inode_readahead_blks
= t
;
2284 static ssize_t
sbi_ui_show(struct ext4_attr
*a
,
2285 struct ext4_sb_info
*sbi
, char *buf
)
2287 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2289 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
2292 static ssize_t
sbi_ui_store(struct ext4_attr
*a
,
2293 struct ext4_sb_info
*sbi
,
2294 const char *buf
, size_t count
)
2296 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2299 if (parse_strtoul(buf
, 0xffffffff, &t
))
2305 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2306 static struct ext4_attr ext4_attr_##_name = { \
2307 .attr = {.name = __stringify(_name), .mode = _mode }, \
2310 .offset = offsetof(struct ext4_sb_info, _elname), \
2312 #define EXT4_ATTR(name, mode, show, store) \
2313 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2315 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2316 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2317 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2318 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2319 #define ATTR_LIST(name) &ext4_attr_##name.attr
2321 EXT4_RO_ATTR(delayed_allocation_blocks
);
2322 EXT4_RO_ATTR(session_write_kbytes
);
2323 EXT4_RO_ATTR(lifetime_write_kbytes
);
2324 EXT4_ATTR_OFFSET(inode_readahead_blks
, 0644, sbi_ui_show
,
2325 inode_readahead_blks_store
, s_inode_readahead_blks
);
2326 EXT4_RW_ATTR_SBI_UI(inode_goal
, s_inode_goal
);
2327 EXT4_RW_ATTR_SBI_UI(mb_stats
, s_mb_stats
);
2328 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan
, s_mb_max_to_scan
);
2329 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan
, s_mb_min_to_scan
);
2330 EXT4_RW_ATTR_SBI_UI(mb_order2_req
, s_mb_order2_reqs
);
2331 EXT4_RW_ATTR_SBI_UI(mb_stream_req
, s_mb_stream_request
);
2332 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc
, s_mb_group_prealloc
);
2333 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump
, s_max_writeback_mb_bump
);
2335 static struct attribute
*ext4_attrs
[] = {
2336 ATTR_LIST(delayed_allocation_blocks
),
2337 ATTR_LIST(session_write_kbytes
),
2338 ATTR_LIST(lifetime_write_kbytes
),
2339 ATTR_LIST(inode_readahead_blks
),
2340 ATTR_LIST(inode_goal
),
2341 ATTR_LIST(mb_stats
),
2342 ATTR_LIST(mb_max_to_scan
),
2343 ATTR_LIST(mb_min_to_scan
),
2344 ATTR_LIST(mb_order2_req
),
2345 ATTR_LIST(mb_stream_req
),
2346 ATTR_LIST(mb_group_prealloc
),
2347 ATTR_LIST(max_writeback_mb_bump
),
2351 static ssize_t
ext4_attr_show(struct kobject
*kobj
,
2352 struct attribute
*attr
, char *buf
)
2354 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2356 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2358 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
2361 static ssize_t
ext4_attr_store(struct kobject
*kobj
,
2362 struct attribute
*attr
,
2363 const char *buf
, size_t len
)
2365 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2367 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2369 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
2372 static void ext4_sb_release(struct kobject
*kobj
)
2374 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2376 complete(&sbi
->s_kobj_unregister
);
2380 static const struct sysfs_ops ext4_attr_ops
= {
2381 .show
= ext4_attr_show
,
2382 .store
= ext4_attr_store
,
2385 static struct kobj_type ext4_ktype
= {
2386 .default_attrs
= ext4_attrs
,
2387 .sysfs_ops
= &ext4_attr_ops
,
2388 .release
= ext4_sb_release
,
2392 * Check whether this filesystem can be mounted based on
2393 * the features present and the RDONLY/RDWR mount requested.
2394 * Returns 1 if this filesystem can be mounted as requested,
2395 * 0 if it cannot be.
2397 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2399 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
)) {
2400 ext4_msg(sb
, KERN_ERR
,
2401 "Couldn't mount because of "
2402 "unsupported optional features (%x)",
2403 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2404 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2411 /* Check that feature set is OK for a read-write mount */
2412 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
)) {
2413 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2414 "unsupported optional features (%x)",
2415 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2416 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2420 * Large file size enabled file system can only be mounted
2421 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2423 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
2424 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2425 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2426 "cannot be mounted RDWR without "
2434 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
2435 __releases(kernel_lock
)
2436 __acquires(kernel_lock
)
2438 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
2439 struct buffer_head
*bh
;
2440 struct ext4_super_block
*es
= NULL
;
2441 struct ext4_sb_info
*sbi
;
2443 ext4_fsblk_t sb_block
= get_sb_block(&data
);
2444 ext4_fsblk_t logical_sb_block
;
2445 unsigned long offset
= 0;
2446 unsigned long journal_devnum
= 0;
2447 unsigned long def_mount_opts
;
2453 unsigned int db_count
;
2455 int needs_recovery
, has_huge_files
;
2458 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
2460 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
2464 sbi
->s_blockgroup_lock
=
2465 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
2466 if (!sbi
->s_blockgroup_lock
) {
2470 sb
->s_fs_info
= sbi
;
2471 sbi
->s_mount_opt
= 0;
2472 sbi
->s_resuid
= EXT4_DEF_RESUID
;
2473 sbi
->s_resgid
= EXT4_DEF_RESGID
;
2474 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
2475 sbi
->s_sb_block
= sb_block
;
2476 sbi
->s_sectors_written_start
= part_stat_read(sb
->s_bdev
->bd_part
,
2481 /* Cleanup superblock name */
2482 for (cp
= sb
->s_id
; (cp
= strchr(cp
, '/'));)
2485 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
2487 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
2492 * The ext4 superblock will not be buffer aligned for other than 1kB
2493 * block sizes. We need to calculate the offset from buffer start.
2495 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
2496 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2497 offset
= do_div(logical_sb_block
, blocksize
);
2499 logical_sb_block
= sb_block
;
2502 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
2503 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
2507 * Note: s_es must be initialized as soon as possible because
2508 * some ext4 macro-instructions depend on its value
2510 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
2512 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
2513 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
2515 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
2517 /* Set defaults before we parse the mount options */
2518 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
2519 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
2520 set_opt(sbi
->s_mount_opt
, DEBUG
);
2521 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
) {
2522 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, "bsdgroups",
2524 set_opt(sbi
->s_mount_opt
, GRPID
);
2526 if (def_mount_opts
& EXT4_DEFM_UID16
)
2527 set_opt(sbi
->s_mount_opt
, NO_UID32
);
2528 #ifdef CONFIG_EXT4_FS_XATTR
2529 if (def_mount_opts
& EXT4_DEFM_XATTR_USER
)
2530 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
2532 #ifdef CONFIG_EXT4_FS_POSIX_ACL
2533 if (def_mount_opts
& EXT4_DEFM_ACL
)
2534 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
2536 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
2537 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
2538 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
2539 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
2540 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
2541 set_opt(sbi
->s_mount_opt
, WRITEBACK_DATA
);
2543 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
2544 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
2545 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
2546 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
2548 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
2550 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
2551 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
2552 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
2553 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
2554 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
2556 set_opt(sbi
->s_mount_opt
, BARRIER
);
2559 * enable delayed allocation by default
2560 * Use -o nodelalloc to turn it off
2562 if (!IS_EXT3_SB(sb
))
2563 set_opt(sbi
->s_mount_opt
, DELALLOC
);
2565 if (!parse_options((char *) data
, sb
, &journal_devnum
,
2566 &journal_ioprio
, NULL
, 0))
2569 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
2570 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
2572 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
2573 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
2574 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
2575 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
2576 ext4_msg(sb
, KERN_WARNING
,
2577 "feature flags set on rev 0 fs, "
2578 "running e2fsck is recommended");
2581 * Check feature flags regardless of the revision level, since we
2582 * previously didn't change the revision level when setting the flags,
2583 * so there is a chance incompat flags are set on a rev 0 filesystem.
2585 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
2588 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
2590 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
2591 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
2592 ext4_msg(sb
, KERN_ERR
,
2593 "Unsupported filesystem blocksize %d", blocksize
);
2597 if (sb
->s_blocksize
!= blocksize
) {
2598 /* Validate the filesystem blocksize */
2599 if (!sb_set_blocksize(sb
, blocksize
)) {
2600 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
2606 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2607 offset
= do_div(logical_sb_block
, blocksize
);
2608 bh
= sb_bread(sb
, logical_sb_block
);
2610 ext4_msg(sb
, KERN_ERR
,
2611 "Can't read superblock on 2nd try");
2614 es
= (struct ext4_super_block
*)(((char *)bh
->b_data
) + offset
);
2616 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
2617 ext4_msg(sb
, KERN_ERR
,
2618 "Magic mismatch, very weird!");
2623 has_huge_files
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2624 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
);
2625 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
2627 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
2629 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
2630 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
2631 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
2633 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
2634 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
2635 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
2636 (!is_power_of_2(sbi
->s_inode_size
)) ||
2637 (sbi
->s_inode_size
> blocksize
)) {
2638 ext4_msg(sb
, KERN_ERR
,
2639 "unsupported inode size: %d",
2643 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
2644 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
2647 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
2648 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
2649 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
2650 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
2651 !is_power_of_2(sbi
->s_desc_size
)) {
2652 ext4_msg(sb
, KERN_ERR
,
2653 "unsupported descriptor size %lu",
2658 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
2660 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
2661 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
2662 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
2665 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
2666 if (sbi
->s_inodes_per_block
== 0)
2668 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
2669 sbi
->s_inodes_per_block
;
2670 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
2672 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
2673 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
2674 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
2676 for (i
= 0; i
< 4; i
++)
2677 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
2678 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
2679 i
= le32_to_cpu(es
->s_flags
);
2680 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
2681 sbi
->s_hash_unsigned
= 3;
2682 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
2683 #ifdef __CHAR_UNSIGNED__
2684 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
2685 sbi
->s_hash_unsigned
= 3;
2687 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
2692 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
2693 ext4_msg(sb
, KERN_ERR
,
2694 "#blocks per group too big: %lu",
2695 sbi
->s_blocks_per_group
);
2698 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
2699 ext4_msg(sb
, KERN_ERR
,
2700 "#inodes per group too big: %lu",
2701 sbi
->s_inodes_per_group
);
2706 * Test whether we have more sectors than will fit in sector_t,
2707 * and whether the max offset is addressable by the page cache.
2709 if ((ext4_blocks_count(es
) >
2710 (sector_t
)(~0ULL) >> (sb
->s_blocksize_bits
- 9)) ||
2711 (ext4_blocks_count(es
) >
2712 (pgoff_t
)(~0ULL) >> (PAGE_CACHE_SHIFT
- sb
->s_blocksize_bits
))) {
2713 ext4_msg(sb
, KERN_ERR
, "filesystem"
2714 " too large to mount safely on this system");
2715 if (sizeof(sector_t
) < 8)
2716 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
2721 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
2724 /* check blocks count against device size */
2725 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
2726 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
2727 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
2728 "exceeds size of device (%llu blocks)",
2729 ext4_blocks_count(es
), blocks_count
);
2734 * It makes no sense for the first data block to be beyond the end
2735 * of the filesystem.
2737 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
2738 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data"
2739 "block %u is beyond end of filesystem (%llu)",
2740 le32_to_cpu(es
->s_first_data_block
),
2741 ext4_blocks_count(es
));
2744 blocks_count
= (ext4_blocks_count(es
) -
2745 le32_to_cpu(es
->s_first_data_block
) +
2746 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2747 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
2748 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
2749 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
2750 "(block count %llu, first data block %u, "
2751 "blocks per group %lu)", sbi
->s_groups_count
,
2752 ext4_blocks_count(es
),
2753 le32_to_cpu(es
->s_first_data_block
),
2754 EXT4_BLOCKS_PER_GROUP(sb
));
2757 sbi
->s_groups_count
= blocks_count
;
2758 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
2759 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
2760 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
2761 EXT4_DESC_PER_BLOCK(sb
);
2762 sbi
->s_group_desc
= kmalloc(db_count
* sizeof(struct buffer_head
*),
2764 if (sbi
->s_group_desc
== NULL
) {
2765 ext4_msg(sb
, KERN_ERR
, "not enough memory");
2769 #ifdef CONFIG_PROC_FS
2771 sbi
->s_proc
= proc_mkdir(sb
->s_id
, ext4_proc_root
);
2774 bgl_lock_init(sbi
->s_blockgroup_lock
);
2776 for (i
= 0; i
< db_count
; i
++) {
2777 block
= descriptor_loc(sb
, logical_sb_block
, i
);
2778 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
2779 if (!sbi
->s_group_desc
[i
]) {
2780 ext4_msg(sb
, KERN_ERR
,
2781 "can't read group descriptor %d", i
);
2786 if (!ext4_check_descriptors(sb
)) {
2787 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
2790 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
2791 if (!ext4_fill_flex_info(sb
)) {
2792 ext4_msg(sb
, KERN_ERR
,
2793 "unable to initialize "
2794 "flex_bg meta info!");
2798 sbi
->s_gdb_count
= db_count
;
2799 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
2800 spin_lock_init(&sbi
->s_next_gen_lock
);
2802 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
2803 sbi
->s_max_writeback_mb_bump
= 128;
2806 * set up enough so that it can read an inode
2808 if (!test_opt(sb
, NOLOAD
) &&
2809 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
2810 sb
->s_op
= &ext4_sops
;
2812 sb
->s_op
= &ext4_nojournal_sops
;
2813 sb
->s_export_op
= &ext4_export_ops
;
2814 sb
->s_xattr
= ext4_xattr_handlers
;
2816 sb
->s_qcop
= &ext4_qctl_operations
;
2817 sb
->dq_op
= &ext4_quota_operations
;
2819 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
2820 mutex_init(&sbi
->s_orphan_lock
);
2821 mutex_init(&sbi
->s_resize_lock
);
2825 needs_recovery
= (es
->s_last_orphan
!= 0 ||
2826 EXT4_HAS_INCOMPAT_FEATURE(sb
,
2827 EXT4_FEATURE_INCOMPAT_RECOVER
));
2830 * The first inode we look at is the journal inode. Don't try
2831 * root first: it may be modified in the journal!
2833 if (!test_opt(sb
, NOLOAD
) &&
2834 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
2835 if (ext4_load_journal(sb
, es
, journal_devnum
))
2837 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
2838 EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
2839 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
2840 "suppressed and not mounted read-only");
2841 goto failed_mount_wq
;
2843 clear_opt(sbi
->s_mount_opt
, DATA_FLAGS
);
2844 set_opt(sbi
->s_mount_opt
, WRITEBACK_DATA
);
2845 sbi
->s_journal
= NULL
;
2850 if (ext4_blocks_count(es
) > 0xffffffffULL
&&
2851 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
2852 JBD2_FEATURE_INCOMPAT_64BIT
)) {
2853 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
2854 goto failed_mount_wq
;
2857 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
2858 jbd2_journal_set_features(sbi
->s_journal
,
2859 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2860 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2861 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
2862 jbd2_journal_set_features(sbi
->s_journal
,
2863 JBD2_FEATURE_COMPAT_CHECKSUM
, 0, 0);
2864 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
2865 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2867 jbd2_journal_clear_features(sbi
->s_journal
,
2868 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2869 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2872 /* We have now updated the journal if required, so we can
2873 * validate the data journaling mode. */
2874 switch (test_opt(sb
, DATA_FLAGS
)) {
2876 /* No mode set, assume a default based on the journal
2877 * capabilities: ORDERED_DATA if the journal can
2878 * cope, else JOURNAL_DATA
2880 if (jbd2_journal_check_available_features
2881 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
2882 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
2884 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
2887 case EXT4_MOUNT_ORDERED_DATA
:
2888 case EXT4_MOUNT_WRITEBACK_DATA
:
2889 if (!jbd2_journal_check_available_features
2890 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
2891 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
2892 "requested data journaling mode");
2893 goto failed_mount_wq
;
2898 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
2901 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
2902 ext4_count_free_blocks(sb
));
2904 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
2905 ext4_count_free_inodes(sb
));
2907 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
2908 ext4_count_dirs(sb
));
2910 err
= percpu_counter_init(&sbi
->s_dirtyblocks_counter
, 0);
2912 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
2913 goto failed_mount_wq
;
2915 if (test_opt(sb
, NOBH
)) {
2916 if (!(test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)) {
2917 ext4_msg(sb
, KERN_WARNING
, "Ignoring nobh option - "
2918 "its supported only with writeback mode");
2919 clear_opt(sbi
->s_mount_opt
, NOBH
);
2921 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
2922 ext4_msg(sb
, KERN_WARNING
, "dioread_nolock option is "
2923 "not supported with nobh mode");
2924 goto failed_mount_wq
;
2927 EXT4_SB(sb
)->dio_unwritten_wq
= create_workqueue("ext4-dio-unwritten");
2928 if (!EXT4_SB(sb
)->dio_unwritten_wq
) {
2929 printk(KERN_ERR
"EXT4-fs: failed to create DIO workqueue\n");
2930 goto failed_mount_wq
;
2934 * The jbd2_journal_load will have done any necessary log recovery,
2935 * so we can safely mount the rest of the filesystem now.
2938 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
2940 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
2941 ret
= PTR_ERR(root
);
2944 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
2946 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
2949 sb
->s_root
= d_alloc_root(root
);
2951 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
2957 ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
);
2959 /* determine the minimum size of new large inodes, if present */
2960 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
2961 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2962 EXT4_GOOD_OLD_INODE_SIZE
;
2963 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2964 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
2965 if (sbi
->s_want_extra_isize
<
2966 le16_to_cpu(es
->s_want_extra_isize
))
2967 sbi
->s_want_extra_isize
=
2968 le16_to_cpu(es
->s_want_extra_isize
);
2969 if (sbi
->s_want_extra_isize
<
2970 le16_to_cpu(es
->s_min_extra_isize
))
2971 sbi
->s_want_extra_isize
=
2972 le16_to_cpu(es
->s_min_extra_isize
);
2975 /* Check if enough inode space is available */
2976 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
2977 sbi
->s_inode_size
) {
2978 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2979 EXT4_GOOD_OLD_INODE_SIZE
;
2980 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
2984 if (test_opt(sb
, DELALLOC
) &&
2985 (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)) {
2986 ext4_msg(sb
, KERN_WARNING
, "Ignoring delalloc option - "
2987 "requested data journaling mode");
2988 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
2990 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
2991 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
2992 ext4_msg(sb
, KERN_WARNING
, "Ignoring dioread_nolock "
2993 "option - requested data journaling mode");
2994 clear_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
2996 if (sb
->s_blocksize
< PAGE_SIZE
) {
2997 ext4_msg(sb
, KERN_WARNING
, "Ignoring dioread_nolock "
2998 "option - block size is too small");
2999 clear_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
3003 err
= ext4_setup_system_zone(sb
);
3005 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
3011 err
= ext4_mb_init(sb
, needs_recovery
);
3013 ext4_msg(sb
, KERN_ERR
, "failed to initalize mballoc (%d)",
3018 sbi
->s_kobj
.kset
= ext4_kset
;
3019 init_completion(&sbi
->s_kobj_unregister
);
3020 err
= kobject_init_and_add(&sbi
->s_kobj
, &ext4_ktype
, NULL
,
3023 ext4_mb_release(sb
);
3024 ext4_ext_release(sb
);
3028 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
3029 ext4_orphan_cleanup(sb
, es
);
3030 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
3031 if (needs_recovery
) {
3032 ext4_msg(sb
, KERN_INFO
, "recovery complete");
3033 ext4_mark_recovery_complete(sb
, es
);
3035 if (EXT4_SB(sb
)->s_journal
) {
3036 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
3037 descr
= " journalled data mode";
3038 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
3039 descr
= " ordered data mode";
3041 descr
= " writeback data mode";
3043 descr
= "out journal";
3045 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s. "
3046 "Opts: %s", descr
, orig_data
);
3054 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
3058 ext4_msg(sb
, KERN_ERR
, "mount failed");
3059 destroy_workqueue(EXT4_SB(sb
)->dio_unwritten_wq
);
3061 ext4_release_system_zone(sb
);
3062 if (sbi
->s_journal
) {
3063 jbd2_journal_destroy(sbi
->s_journal
);
3064 sbi
->s_journal
= NULL
;
3066 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
3067 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
3068 percpu_counter_destroy(&sbi
->s_dirs_counter
);
3069 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
3071 if (sbi
->s_flex_groups
) {
3072 if (is_vmalloc_addr(sbi
->s_flex_groups
))
3073 vfree(sbi
->s_flex_groups
);
3075 kfree(sbi
->s_flex_groups
);
3078 for (i
= 0; i
< db_count
; i
++)
3079 brelse(sbi
->s_group_desc
[i
]);
3080 kfree(sbi
->s_group_desc
);
3083 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
3086 for (i
= 0; i
< MAXQUOTAS
; i
++)
3087 kfree(sbi
->s_qf_names
[i
]);
3089 ext4_blkdev_remove(sbi
);
3092 sb
->s_fs_info
= NULL
;
3093 kfree(sbi
->s_blockgroup_lock
);
3101 * Setup any per-fs journal parameters now. We'll do this both on
3102 * initial mount, once the journal has been initialised but before we've
3103 * done any recovery; and again on any subsequent remount.
3105 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
3107 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3109 journal
->j_commit_interval
= sbi
->s_commit_interval
;
3110 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
3111 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
3113 spin_lock(&journal
->j_state_lock
);
3114 if (test_opt(sb
, BARRIER
))
3115 journal
->j_flags
|= JBD2_BARRIER
;
3117 journal
->j_flags
&= ~JBD2_BARRIER
;
3118 if (test_opt(sb
, DATA_ERR_ABORT
))
3119 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
3121 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
3122 spin_unlock(&journal
->j_state_lock
);
3125 static journal_t
*ext4_get_journal(struct super_block
*sb
,
3126 unsigned int journal_inum
)
3128 struct inode
*journal_inode
;
3131 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3133 /* First, test for the existence of a valid inode on disk. Bad
3134 * things happen if we iget() an unused inode, as the subsequent
3135 * iput() will try to delete it. */
3137 journal_inode
= ext4_iget(sb
, journal_inum
);
3138 if (IS_ERR(journal_inode
)) {
3139 ext4_msg(sb
, KERN_ERR
, "no journal found");
3142 if (!journal_inode
->i_nlink
) {
3143 make_bad_inode(journal_inode
);
3144 iput(journal_inode
);
3145 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
3149 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3150 journal_inode
, journal_inode
->i_size
);
3151 if (!S_ISREG(journal_inode
->i_mode
)) {
3152 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
3153 iput(journal_inode
);
3157 journal
= jbd2_journal_init_inode(journal_inode
);
3159 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
3160 iput(journal_inode
);
3163 journal
->j_private
= sb
;
3164 ext4_init_journal_params(sb
, journal
);
3168 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
3171 struct buffer_head
*bh
;
3175 int hblock
, blocksize
;
3176 ext4_fsblk_t sb_block
;
3177 unsigned long offset
;
3178 struct ext4_super_block
*es
;
3179 struct block_device
*bdev
;
3181 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3183 bdev
= ext4_blkdev_get(j_dev
, sb
);
3187 if (bd_claim(bdev
, sb
)) {
3188 ext4_msg(sb
, KERN_ERR
,
3189 "failed to claim external journal device");
3190 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
3194 blocksize
= sb
->s_blocksize
;
3195 hblock
= bdev_logical_block_size(bdev
);
3196 if (blocksize
< hblock
) {
3197 ext4_msg(sb
, KERN_ERR
,
3198 "blocksize too small for journal device");
3202 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
3203 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
3204 set_blocksize(bdev
, blocksize
);
3205 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
3206 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
3207 "external journal");
3211 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
3212 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
3213 !(le32_to_cpu(es
->s_feature_incompat
) &
3214 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
3215 ext4_msg(sb
, KERN_ERR
, "external journal has "
3221 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
3222 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
3227 len
= ext4_blocks_count(es
);
3228 start
= sb_block
+ 1;
3229 brelse(bh
); /* we're done with the superblock */
3231 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
3232 start
, len
, blocksize
);
3234 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
3237 journal
->j_private
= sb
;
3238 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
3239 wait_on_buffer(journal
->j_sb_buffer
);
3240 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
3241 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
3244 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
3245 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
3246 "user (unsupported) - %d",
3247 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
3250 EXT4_SB(sb
)->journal_bdev
= bdev
;
3251 ext4_init_journal_params(sb
, journal
);
3255 jbd2_journal_destroy(journal
);
3257 ext4_blkdev_put(bdev
);
3261 static int ext4_load_journal(struct super_block
*sb
,
3262 struct ext4_super_block
*es
,
3263 unsigned long journal_devnum
)
3266 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
3269 int really_read_only
;
3271 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3273 if (journal_devnum
&&
3274 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3275 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
3276 "numbers have changed");
3277 journal_dev
= new_decode_dev(journal_devnum
);
3279 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
3281 really_read_only
= bdev_read_only(sb
->s_bdev
);
3284 * Are we loading a blank journal or performing recovery after a
3285 * crash? For recovery, we need to check in advance whether we
3286 * can get read-write access to the device.
3288 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3289 if (sb
->s_flags
& MS_RDONLY
) {
3290 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
3291 "required on readonly filesystem");
3292 if (really_read_only
) {
3293 ext4_msg(sb
, KERN_ERR
, "write access "
3294 "unavailable, cannot proceed");
3297 ext4_msg(sb
, KERN_INFO
, "write access will "
3298 "be enabled during recovery");
3302 if (journal_inum
&& journal_dev
) {
3303 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
3304 "and inode journals!");
3309 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
3312 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
3316 if (!(journal
->j_flags
& JBD2_BARRIER
))
3317 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
3319 if (!really_read_only
&& test_opt(sb
, UPDATE_JOURNAL
)) {
3320 err
= jbd2_journal_update_format(journal
);
3322 ext4_msg(sb
, KERN_ERR
, "error updating journal");
3323 jbd2_journal_destroy(journal
);
3328 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
3329 err
= jbd2_journal_wipe(journal
, !really_read_only
);
3331 err
= jbd2_journal_load(journal
);
3334 ext4_msg(sb
, KERN_ERR
, "error loading journal");
3335 jbd2_journal_destroy(journal
);
3339 EXT4_SB(sb
)->s_journal
= journal
;
3340 ext4_clear_journal_err(sb
, es
);
3342 if (journal_devnum
&&
3343 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3344 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
3346 /* Make sure we flush the recovery flag to disk. */
3347 ext4_commit_super(sb
, 1);
3353 static int ext4_commit_super(struct super_block
*sb
, int sync
)
3355 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
3356 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
3361 if (buffer_write_io_error(sbh
)) {
3363 * Oh, dear. A previous attempt to write the
3364 * superblock failed. This could happen because the
3365 * USB device was yanked out. Or it could happen to
3366 * be a transient write error and maybe the block will
3367 * be remapped. Nothing we can do but to retry the
3368 * write and hope for the best.
3370 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
3371 "superblock detected");
3372 clear_buffer_write_io_error(sbh
);
3373 set_buffer_uptodate(sbh
);
3376 * If the file system is mounted read-only, don't update the
3377 * superblock write time. This avoids updating the superblock
3378 * write time when we are mounting the root file system
3379 * read/only but we need to replay the journal; at that point,
3380 * for people who are east of GMT and who make their clock
3381 * tick in localtime for Windows bug-for-bug compatibility,
3382 * the clock is set in the future, and this will cause e2fsck
3383 * to complain and force a full file system check.
3385 if (!(sb
->s_flags
& MS_RDONLY
))
3386 es
->s_wtime
= cpu_to_le32(get_seconds());
3387 es
->s_kbytes_written
=
3388 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
3389 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
3390 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
3391 ext4_free_blocks_count_set(es
, percpu_counter_sum_positive(
3392 &EXT4_SB(sb
)->s_freeblocks_counter
));
3393 es
->s_free_inodes_count
= cpu_to_le32(percpu_counter_sum_positive(
3394 &EXT4_SB(sb
)->s_freeinodes_counter
));
3396 BUFFER_TRACE(sbh
, "marking dirty");
3397 mark_buffer_dirty(sbh
);
3399 error
= sync_dirty_buffer(sbh
);
3403 error
= buffer_write_io_error(sbh
);
3405 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
3407 clear_buffer_write_io_error(sbh
);
3408 set_buffer_uptodate(sbh
);
3415 * Have we just finished recovery? If so, and if we are mounting (or
3416 * remounting) the filesystem readonly, then we will end up with a
3417 * consistent fs on disk. Record that fact.
3419 static void ext4_mark_recovery_complete(struct super_block
*sb
,
3420 struct ext4_super_block
*es
)
3422 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
3424 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
3425 BUG_ON(journal
!= NULL
);
3428 jbd2_journal_lock_updates(journal
);
3429 if (jbd2_journal_flush(journal
) < 0)
3432 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
3433 sb
->s_flags
& MS_RDONLY
) {
3434 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3435 ext4_commit_super(sb
, 1);
3439 jbd2_journal_unlock_updates(journal
);
3443 * If we are mounting (or read-write remounting) a filesystem whose journal
3444 * has recorded an error from a previous lifetime, move that error to the
3445 * main filesystem now.
3447 static void ext4_clear_journal_err(struct super_block
*sb
,
3448 struct ext4_super_block
*es
)
3454 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3456 journal
= EXT4_SB(sb
)->s_journal
;
3459 * Now check for any error status which may have been recorded in the
3460 * journal by a prior ext4_error() or ext4_abort()
3463 j_errno
= jbd2_journal_errno(journal
);
3467 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
3468 ext4_warning(sb
, "Filesystem error recorded "
3469 "from previous mount: %s", errstr
);
3470 ext4_warning(sb
, "Marking fs in need of filesystem check.");
3472 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
3473 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
3474 ext4_commit_super(sb
, 1);
3476 jbd2_journal_clear_err(journal
);
3481 * Force the running and committing transactions to commit,
3482 * and wait on the commit.
3484 int ext4_force_commit(struct super_block
*sb
)
3489 if (sb
->s_flags
& MS_RDONLY
)
3492 journal
= EXT4_SB(sb
)->s_journal
;
3494 vfs_check_frozen(sb
, SB_FREEZE_WRITE
);
3495 ret
= ext4_journal_force_commit(journal
);
3501 static void ext4_write_super(struct super_block
*sb
)
3504 ext4_commit_super(sb
, 1);
3508 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
3512 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3514 trace_ext4_sync_fs(sb
, wait
);
3515 flush_workqueue(sbi
->dio_unwritten_wq
);
3516 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
3518 jbd2_log_wait_commit(sbi
->s_journal
, target
);
3524 * LVM calls this function before a (read-only) snapshot is created. This
3525 * gives us a chance to flush the journal completely and mark the fs clean.
3527 static int ext4_freeze(struct super_block
*sb
)
3532 if (sb
->s_flags
& MS_RDONLY
)
3535 journal
= EXT4_SB(sb
)->s_journal
;
3537 /* Now we set up the journal barrier. */
3538 jbd2_journal_lock_updates(journal
);
3541 * Don't clear the needs_recovery flag if we failed to flush
3544 error
= jbd2_journal_flush(journal
);
3548 /* Journal blocked and flushed, clear needs_recovery flag. */
3549 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3550 error
= ext4_commit_super(sb
, 1);
3552 /* we rely on s_frozen to stop further updates */
3553 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
3558 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3559 * flag here, even though the filesystem is not technically dirty yet.
3561 static int ext4_unfreeze(struct super_block
*sb
)
3563 if (sb
->s_flags
& MS_RDONLY
)
3567 /* Reset the needs_recovery flag before the fs is unlocked. */
3568 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3569 ext4_commit_super(sb
, 1);
3574 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
3576 struct ext4_super_block
*es
;
3577 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3578 ext4_fsblk_t n_blocks_count
= 0;
3579 unsigned long old_sb_flags
;
3580 struct ext4_mount_options old_opts
;
3581 int enable_quota
= 0;
3583 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3588 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
3592 /* Store the original options */
3594 old_sb_flags
= sb
->s_flags
;
3595 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
3596 old_opts
.s_resuid
= sbi
->s_resuid
;
3597 old_opts
.s_resgid
= sbi
->s_resgid
;
3598 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
3599 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
3600 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
3602 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
3603 for (i
= 0; i
< MAXQUOTAS
; i
++)
3604 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
3606 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
3607 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
3610 * Allow the "check" option to be passed as a remount option.
3612 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
,
3613 &n_blocks_count
, 1)) {
3618 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
3619 ext4_abort(sb
, __func__
, "Abort forced by user");
3621 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3622 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
3626 if (sbi
->s_journal
) {
3627 ext4_init_journal_params(sb
, sbi
->s_journal
);
3628 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
3631 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
) ||
3632 n_blocks_count
> ext4_blocks_count(es
)) {
3633 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
3638 if (*flags
& MS_RDONLY
) {
3639 err
= dquot_suspend(sb
, -1);
3644 * First of all, the unconditional stuff we have to do
3645 * to disable replay of the journal when we next remount
3647 sb
->s_flags
|= MS_RDONLY
;
3650 * OK, test if we are remounting a valid rw partition
3651 * readonly, and if so set the rdonly flag and then
3652 * mark the partition as valid again.
3654 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
3655 (sbi
->s_mount_state
& EXT4_VALID_FS
))
3656 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
3659 ext4_mark_recovery_complete(sb
, es
);
3661 /* Make sure we can mount this feature set readwrite */
3662 if (!ext4_feature_set_ok(sb
, 0)) {
3667 * Make sure the group descriptor checksums
3668 * are sane. If they aren't, refuse to remount r/w.
3670 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
3671 struct ext4_group_desc
*gdp
=
3672 ext4_get_group_desc(sb
, g
, NULL
);
3674 if (!ext4_group_desc_csum_verify(sbi
, g
, gdp
)) {
3675 ext4_msg(sb
, KERN_ERR
,
3676 "ext4_remount: Checksum for group %u failed (%u!=%u)",
3677 g
, le16_to_cpu(ext4_group_desc_csum(sbi
, g
, gdp
)),
3678 le16_to_cpu(gdp
->bg_checksum
));
3685 * If we have an unprocessed orphan list hanging
3686 * around from a previously readonly bdev mount,
3687 * require a full umount/remount for now.
3689 if (es
->s_last_orphan
) {
3690 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
3691 "remount RDWR because of unprocessed "
3692 "orphan inode list. Please "
3693 "umount/remount instead");
3699 * Mounting a RDONLY partition read-write, so reread
3700 * and store the current valid flag. (It may have
3701 * been changed by e2fsck since we originally mounted
3705 ext4_clear_journal_err(sb
, es
);
3706 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3707 if ((err
= ext4_group_extend(sb
, es
, n_blocks_count
)))
3709 if (!ext4_setup_super(sb
, es
, 0))
3710 sb
->s_flags
&= ~MS_RDONLY
;
3714 ext4_setup_system_zone(sb
);
3715 if (sbi
->s_journal
== NULL
)
3716 ext4_commit_super(sb
, 1);
3719 /* Release old quota file names */
3720 for (i
= 0; i
< MAXQUOTAS
; i
++)
3721 if (old_opts
.s_qf_names
[i
] &&
3722 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3723 kfree(old_opts
.s_qf_names
[i
]);
3728 dquot_resume(sb
, -1);
3730 ext4_msg(sb
, KERN_INFO
, "re-mounted. Opts: %s", orig_data
);
3735 sb
->s_flags
= old_sb_flags
;
3736 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
3737 sbi
->s_resuid
= old_opts
.s_resuid
;
3738 sbi
->s_resgid
= old_opts
.s_resgid
;
3739 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
3740 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
3741 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
3743 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
3744 for (i
= 0; i
< MAXQUOTAS
; i
++) {
3745 if (sbi
->s_qf_names
[i
] &&
3746 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3747 kfree(sbi
->s_qf_names
[i
]);
3748 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
3757 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
3759 struct super_block
*sb
= dentry
->d_sb
;
3760 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3761 struct ext4_super_block
*es
= sbi
->s_es
;
3764 if (test_opt(sb
, MINIX_DF
)) {
3765 sbi
->s_overhead_last
= 0;
3766 } else if (sbi
->s_blocks_last
!= ext4_blocks_count(es
)) {
3767 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3768 ext4_fsblk_t overhead
= 0;
3771 * Compute the overhead (FS structures). This is constant
3772 * for a given filesystem unless the number of block groups
3773 * changes so we cache the previous value until it does.
3777 * All of the blocks before first_data_block are
3780 overhead
= le32_to_cpu(es
->s_first_data_block
);
3783 * Add the overhead attributed to the superblock and
3784 * block group descriptors. If the sparse superblocks
3785 * feature is turned on, then not all groups have this.
3787 for (i
= 0; i
< ngroups
; i
++) {
3788 overhead
+= ext4_bg_has_super(sb
, i
) +
3789 ext4_bg_num_gdb(sb
, i
);
3794 * Every block group has an inode bitmap, a block
3795 * bitmap, and an inode table.
3797 overhead
+= ngroups
* (2 + sbi
->s_itb_per_group
);
3798 sbi
->s_overhead_last
= overhead
;
3800 sbi
->s_blocks_last
= ext4_blocks_count(es
);
3803 buf
->f_type
= EXT4_SUPER_MAGIC
;
3804 buf
->f_bsize
= sb
->s_blocksize
;
3805 buf
->f_blocks
= ext4_blocks_count(es
) - sbi
->s_overhead_last
;
3806 buf
->f_bfree
= percpu_counter_sum_positive(&sbi
->s_freeblocks_counter
) -
3807 percpu_counter_sum_positive(&sbi
->s_dirtyblocks_counter
);
3808 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
3809 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
3811 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
3812 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
3813 buf
->f_namelen
= EXT4_NAME_LEN
;
3814 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
3815 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
3816 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
3817 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
3822 /* Helper function for writing quotas on sync - we need to start transaction
3823 * before quota file is locked for write. Otherwise the are possible deadlocks:
3824 * Process 1 Process 2
3825 * ext4_create() quota_sync()
3826 * jbd2_journal_start() write_dquot()
3827 * dquot_initialize() down(dqio_mutex)
3828 * down(dqio_mutex) jbd2_journal_start()
3834 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
3836 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_type
];
3839 static int ext4_write_dquot(struct dquot
*dquot
)
3843 struct inode
*inode
;
3845 inode
= dquot_to_inode(dquot
);
3846 handle
= ext4_journal_start(inode
,
3847 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
3849 return PTR_ERR(handle
);
3850 ret
= dquot_commit(dquot
);
3851 err
= ext4_journal_stop(handle
);
3857 static int ext4_acquire_dquot(struct dquot
*dquot
)
3862 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3863 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
3865 return PTR_ERR(handle
);
3866 ret
= dquot_acquire(dquot
);
3867 err
= ext4_journal_stop(handle
);
3873 static int ext4_release_dquot(struct dquot
*dquot
)
3878 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3879 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
3880 if (IS_ERR(handle
)) {
3881 /* Release dquot anyway to avoid endless cycle in dqput() */
3882 dquot_release(dquot
);
3883 return PTR_ERR(handle
);
3885 ret
= dquot_release(dquot
);
3886 err
= ext4_journal_stop(handle
);
3892 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
3894 /* Are we journaling quotas? */
3895 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
3896 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
3897 dquot_mark_dquot_dirty(dquot
);
3898 return ext4_write_dquot(dquot
);
3900 return dquot_mark_dquot_dirty(dquot
);
3904 static int ext4_write_info(struct super_block
*sb
, int type
)
3909 /* Data block + inode block */
3910 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
3912 return PTR_ERR(handle
);
3913 ret
= dquot_commit_info(sb
, type
);
3914 err
= ext4_journal_stop(handle
);
3921 * Turn on quotas during mount time - we need to find
3922 * the quota file and such...
3924 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
3926 return dquot_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
3927 EXT4_SB(sb
)->s_jquota_fmt
, type
);
3931 * Standard function to be called on quota_on
3933 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
3939 if (!test_opt(sb
, QUOTA
))
3942 err
= kern_path(name
, LOOKUP_FOLLOW
, &path
);
3946 /* Quotafile not on the same filesystem? */
3947 if (path
.mnt
->mnt_sb
!= sb
) {
3951 /* Journaling quota? */
3952 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
3953 /* Quotafile not in fs root? */
3954 if (path
.dentry
->d_parent
!= sb
->s_root
)
3955 ext4_msg(sb
, KERN_WARNING
,
3956 "Quota file not on filesystem root. "
3957 "Journaled quota will not work");
3961 * When we journal data on quota file, we have to flush journal to see
3962 * all updates to the file when we bypass pagecache...
3964 if (EXT4_SB(sb
)->s_journal
&&
3965 ext4_should_journal_data(path
.dentry
->d_inode
)) {
3967 * We don't need to lock updates but journal_flush() could
3968 * otherwise be livelocked...
3970 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
3971 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
3972 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
3979 err
= dquot_quota_on_path(sb
, type
, format_id
, &path
);
3984 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3985 * acquiring the locks... As quota files are never truncated and quota code
3986 * itself serializes the operations (and noone else should touch the files)
3987 * we don't have to be afraid of races */
3988 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
3989 size_t len
, loff_t off
)
3991 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
3992 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
3994 int offset
= off
& (sb
->s_blocksize
- 1);
3997 struct buffer_head
*bh
;
3998 loff_t i_size
= i_size_read(inode
);
4002 if (off
+len
> i_size
)
4005 while (toread
> 0) {
4006 tocopy
= sb
->s_blocksize
- offset
< toread
?
4007 sb
->s_blocksize
- offset
: toread
;
4008 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
4011 if (!bh
) /* A hole? */
4012 memset(data
, 0, tocopy
);
4014 memcpy(data
, bh
->b_data
+offset
, tocopy
);
4024 /* Write to quotafile (we know the transaction is already started and has
4025 * enough credits) */
4026 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
4027 const char *data
, size_t len
, loff_t off
)
4029 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
4030 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
4032 int offset
= off
& (sb
->s_blocksize
- 1);
4033 int journal_quota
= EXT4_SB(sb
)->s_qf_names
[type
] != NULL
;
4034 struct buffer_head
*bh
;
4035 handle_t
*handle
= journal_current_handle();
4037 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
4038 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
4039 " cancelled because transaction is not started",
4040 (unsigned long long)off
, (unsigned long long)len
);
4044 * Since we account only one data block in transaction credits,
4045 * then it is impossible to cross a block boundary.
4047 if (sb
->s_blocksize
- offset
< len
) {
4048 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
4049 " cancelled because not block aligned",
4050 (unsigned long long)off
, (unsigned long long)len
);
4054 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
4055 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
4058 if (journal_quota
) {
4059 err
= ext4_journal_get_write_access(handle
, bh
);
4066 memcpy(bh
->b_data
+offset
, data
, len
);
4067 flush_dcache_page(bh
->b_page
);
4070 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
4072 /* Always do at least ordered writes for quotas */
4073 err
= ext4_jbd2_file_inode(handle
, inode
);
4074 mark_buffer_dirty(bh
);
4079 mutex_unlock(&inode
->i_mutex
);
4082 if (inode
->i_size
< off
+ len
) {
4083 i_size_write(inode
, off
+ len
);
4084 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
4086 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
4087 ext4_mark_inode_dirty(handle
, inode
);
4088 mutex_unlock(&inode
->i_mutex
);
4094 static int ext4_get_sb(struct file_system_type
*fs_type
, int flags
,
4095 const char *dev_name
, void *data
, struct vfsmount
*mnt
)
4097 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
,mnt
);
4100 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4101 static struct file_system_type ext2_fs_type
= {
4102 .owner
= THIS_MODULE
,
4104 .get_sb
= ext4_get_sb
,
4105 .kill_sb
= kill_block_super
,
4106 .fs_flags
= FS_REQUIRES_DEV
,
4109 static inline void register_as_ext2(void)
4111 int err
= register_filesystem(&ext2_fs_type
);
4114 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
4117 static inline void unregister_as_ext2(void)
4119 unregister_filesystem(&ext2_fs_type
);
4121 MODULE_ALIAS("ext2");
4123 static inline void register_as_ext2(void) { }
4124 static inline void unregister_as_ext2(void) { }
4127 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4128 static inline void register_as_ext3(void)
4130 int err
= register_filesystem(&ext3_fs_type
);
4133 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
4136 static inline void unregister_as_ext3(void)
4138 unregister_filesystem(&ext3_fs_type
);
4140 MODULE_ALIAS("ext3");
4142 static inline void register_as_ext3(void) { }
4143 static inline void unregister_as_ext3(void) { }
4146 static struct file_system_type ext4_fs_type
= {
4147 .owner
= THIS_MODULE
,
4149 .get_sb
= ext4_get_sb
,
4150 .kill_sb
= kill_block_super
,
4151 .fs_flags
= FS_REQUIRES_DEV
,
4154 static int __init
init_ext4_fs(void)
4158 ext4_check_flag_values();
4159 err
= init_ext4_system_zone();
4162 ext4_kset
= kset_create_and_add("ext4", NULL
, fs_kobj
);
4165 ext4_proc_root
= proc_mkdir("fs/ext4", NULL
);
4166 err
= init_ext4_mballoc();
4170 err
= init_ext4_xattr();
4173 err
= init_inodecache();
4178 err
= register_filesystem(&ext4_fs_type
);
4183 unregister_as_ext2();
4184 unregister_as_ext3();
4185 destroy_inodecache();
4189 exit_ext4_mballoc();
4191 remove_proc_entry("fs/ext4", NULL
);
4192 kset_unregister(ext4_kset
);
4194 exit_ext4_system_zone();
4198 static void __exit
exit_ext4_fs(void)
4200 unregister_as_ext2();
4201 unregister_as_ext3();
4202 unregister_filesystem(&ext4_fs_type
);
4203 destroy_inodecache();
4205 exit_ext4_mballoc();
4206 remove_proc_entry("fs/ext4", NULL
);
4207 kset_unregister(ext4_kset
);
4208 exit_ext4_system_zone();
4211 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4212 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4213 MODULE_LICENSE("GPL");
4214 module_init(init_ext4_fs
)
4215 module_exit(exit_ext4_fs
)