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
, "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
, unsigned int line
, 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
, line
, err
);
286 void ext4_journal_abort_handle(const char *caller
, unsigned int line
,
287 const char *err_fn
, struct buffer_head
*bh
,
288 handle_t
*handle
, int err
)
291 const char *errstr
= ext4_decode_error(NULL
, err
, nbuf
);
293 BUG_ON(!ext4_handle_valid(handle
));
296 BUFFER_TRACE(bh
, "abort");
301 if (is_handle_aborted(handle
))
304 printk(KERN_ERR
"%s:%d: aborting transaction: %s in %s\n",
305 caller
, line
, errstr
, err_fn
);
307 jbd2_journal_abort_handle(handle
);
310 /* Deal with the reporting of failure conditions on a filesystem such as
311 * inconsistencies detected or read IO failures.
313 * On ext2, we can store the error state of the filesystem in the
314 * superblock. That is not possible on ext4, because we may have other
315 * write ordering constraints on the superblock which prevent us from
316 * writing it out straight away; and given that the journal is about to
317 * be aborted, we can't rely on the current, or future, transactions to
318 * write out the superblock safely.
320 * We'll just use the jbd2_journal_abort() error code to record an error in
321 * the journal instead. On recovery, the journal will complain about
322 * that error until we've noted it down and cleared it.
325 static void ext4_handle_error(struct super_block
*sb
)
327 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
329 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
330 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
332 if (sb
->s_flags
& MS_RDONLY
)
335 if (!test_opt(sb
, ERRORS_CONT
)) {
336 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
338 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
340 jbd2_journal_abort(journal
, -EIO
);
342 if (test_opt(sb
, ERRORS_RO
)) {
343 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
344 sb
->s_flags
|= MS_RDONLY
;
346 ext4_commit_super(sb
, 1);
347 if (test_opt(sb
, ERRORS_PANIC
))
348 panic("EXT4-fs (device %s): panic forced after error\n",
352 void __ext4_error(struct super_block
*sb
, const char *function
,
353 unsigned int line
, const char *fmt
, ...)
358 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: comm %s: ",
359 sb
->s_id
, function
, line
, current
->comm
);
364 ext4_handle_error(sb
);
367 void ext4_error_inode(struct inode
*inode
, const char *function
,
368 unsigned int line
, ext4_fsblk_t block
,
369 const char *fmt
, ...)
374 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: inode #%lu: ",
375 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
);
377 printk("block %llu: ", block
);
378 printk("comm %s: ", current
->comm
);
383 ext4_handle_error(inode
->i_sb
);
386 void ext4_error_file(struct file
*file
, const char *function
,
387 unsigned int line
, const char *fmt
, ...)
390 struct inode
*inode
= file
->f_dentry
->d_inode
;
391 char pathname
[80], *path
;
394 path
= d_path(&(file
->f_path
), pathname
, sizeof(pathname
));
398 "EXT4-fs error (device %s): %s:%d: inode #%lu "
399 "(comm %s path %s): ",
400 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
401 current
->comm
, path
);
406 ext4_handle_error(inode
->i_sb
);
409 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
416 errstr
= "IO failure";
419 errstr
= "Out of memory";
422 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
423 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
424 errstr
= "Journal has aborted";
426 errstr
= "Readonly filesystem";
429 /* If the caller passed in an extra buffer for unknown
430 * errors, textualise them now. Else we just return
433 /* Check for truncated error codes... */
434 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
443 /* __ext4_std_error decodes expected errors from journaling functions
444 * automatically and invokes the appropriate error response. */
446 void __ext4_std_error(struct super_block
*sb
, const char *function
,
447 unsigned int line
, int errno
)
452 /* Special case: if the error is EROFS, and we're not already
453 * inside a transaction, then there's really no point in logging
455 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
456 (sb
->s_flags
& MS_RDONLY
))
459 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
460 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s:%d: %s\n",
461 sb
->s_id
, function
, line
, errstr
);
463 ext4_handle_error(sb
);
467 * ext4_abort is a much stronger failure handler than ext4_error. The
468 * abort function may be used to deal with unrecoverable failures such
469 * as journal IO errors or ENOMEM at a critical moment in log management.
471 * We unconditionally force the filesystem into an ABORT|READONLY state,
472 * unless the error response on the fs has been set to panic in which
473 * case we take the easy way out and panic immediately.
476 void __ext4_abort(struct super_block
*sb
, const char *function
,
477 unsigned int line
, const char *fmt
, ...)
482 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: ", sb
->s_id
,
488 if (test_opt(sb
, ERRORS_PANIC
))
489 panic("EXT4-fs panic from previous error\n");
491 if (sb
->s_flags
& MS_RDONLY
)
494 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
495 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
496 sb
->s_flags
|= MS_RDONLY
;
497 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
498 if (EXT4_SB(sb
)->s_journal
)
499 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
502 void ext4_msg (struct super_block
* sb
, const char *prefix
,
503 const char *fmt
, ...)
508 printk("%sEXT4-fs (%s): ", prefix
, sb
->s_id
);
514 void __ext4_warning(struct super_block
*sb
, const char *function
,
515 unsigned int line
, const char *fmt
, ...)
520 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: ",
521 sb
->s_id
, function
, line
);
527 void __ext4_grp_locked_error(const char *function
, unsigned int line
,
528 struct super_block
*sb
, ext4_group_t grp
,
529 unsigned long ino
, ext4_fsblk_t block
,
530 const char *fmt
, ...)
535 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
538 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: group %u",
539 sb
->s_id
, function
, line
, grp
);
541 printk("inode %lu: ", ino
);
543 printk("block %llu:", (unsigned long long) block
);
548 if (test_opt(sb
, ERRORS_CONT
)) {
549 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
550 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
551 ext4_commit_super(sb
, 0);
554 ext4_unlock_group(sb
, grp
);
555 ext4_handle_error(sb
);
557 * We only get here in the ERRORS_RO case; relocking the group
558 * may be dangerous, but nothing bad will happen since the
559 * filesystem will have already been marked read/only and the
560 * journal has been aborted. We return 1 as a hint to callers
561 * who might what to use the return value from
562 * ext4_grp_locked_error() to distinguish beween the
563 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
564 * aggressively from the ext4 function in question, with a
565 * more appropriate error code.
567 ext4_lock_group(sb
, grp
);
571 void ext4_update_dynamic_rev(struct super_block
*sb
)
573 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
575 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
579 "updating to rev %d because of new feature flag, "
580 "running e2fsck is recommended",
583 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
584 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
585 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
586 /* leave es->s_feature_*compat flags alone */
587 /* es->s_uuid will be set by e2fsck if empty */
590 * The rest of the superblock fields should be zero, and if not it
591 * means they are likely already in use, so leave them alone. We
592 * can leave it up to e2fsck to clean up any inconsistencies there.
597 * Open the external journal device
599 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
601 struct block_device
*bdev
;
602 char b
[BDEVNAME_SIZE
];
604 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
610 ext4_msg(sb
, KERN_ERR
, "failed to open journal device %s: %ld",
611 __bdevname(dev
, b
), PTR_ERR(bdev
));
616 * Release the journal device
618 static int ext4_blkdev_put(struct block_device
*bdev
)
621 return blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
624 static int ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
626 struct block_device
*bdev
;
629 bdev
= sbi
->journal_bdev
;
631 ret
= ext4_blkdev_put(bdev
);
632 sbi
->journal_bdev
= NULL
;
637 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
639 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
642 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
646 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
647 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
649 printk(KERN_ERR
"sb_info orphan list:\n");
650 list_for_each(l
, &sbi
->s_orphan
) {
651 struct inode
*inode
= orphan_list_entry(l
);
653 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
654 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
655 inode
->i_mode
, inode
->i_nlink
,
660 static void ext4_put_super(struct super_block
*sb
)
662 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
663 struct ext4_super_block
*es
= sbi
->s_es
;
666 dquot_disable(sb
, -1, DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
668 flush_workqueue(sbi
->dio_unwritten_wq
);
669 destroy_workqueue(sbi
->dio_unwritten_wq
);
674 ext4_commit_super(sb
, 1);
676 if (sbi
->s_journal
) {
677 err
= jbd2_journal_destroy(sbi
->s_journal
);
678 sbi
->s_journal
= NULL
;
680 ext4_abort(sb
, "Couldn't clean up the journal");
683 ext4_release_system_zone(sb
);
685 ext4_ext_release(sb
);
686 ext4_xattr_put_super(sb
);
688 if (!(sb
->s_flags
& MS_RDONLY
)) {
689 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
690 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
691 ext4_commit_super(sb
, 1);
694 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
696 kobject_del(&sbi
->s_kobj
);
698 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
699 brelse(sbi
->s_group_desc
[i
]);
700 kfree(sbi
->s_group_desc
);
701 if (is_vmalloc_addr(sbi
->s_flex_groups
))
702 vfree(sbi
->s_flex_groups
);
704 kfree(sbi
->s_flex_groups
);
705 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
706 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
707 percpu_counter_destroy(&sbi
->s_dirs_counter
);
708 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
711 for (i
= 0; i
< MAXQUOTAS
; i
++)
712 kfree(sbi
->s_qf_names
[i
]);
715 /* Debugging code just in case the in-memory inode orphan list
716 * isn't empty. The on-disk one can be non-empty if we've
717 * detected an error and taken the fs readonly, but the
718 * in-memory list had better be clean by this point. */
719 if (!list_empty(&sbi
->s_orphan
))
720 dump_orphan_list(sb
, sbi
);
721 J_ASSERT(list_empty(&sbi
->s_orphan
));
723 invalidate_bdev(sb
->s_bdev
);
724 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
726 * Invalidate the journal device's buffers. We don't want them
727 * floating about in memory - the physical journal device may
728 * hotswapped, and it breaks the `ro-after' testing code.
730 sync_blockdev(sbi
->journal_bdev
);
731 invalidate_bdev(sbi
->journal_bdev
);
732 ext4_blkdev_remove(sbi
);
734 sb
->s_fs_info
= NULL
;
736 * Now that we are completely done shutting down the
737 * superblock, we need to actually destroy the kobject.
741 kobject_put(&sbi
->s_kobj
);
742 wait_for_completion(&sbi
->s_kobj_unregister
);
743 kfree(sbi
->s_blockgroup_lock
);
747 static struct kmem_cache
*ext4_inode_cachep
;
750 * Called inside transaction, so use GFP_NOFS
752 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
754 struct ext4_inode_info
*ei
;
756 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
760 ei
->vfs_inode
.i_version
= 1;
761 ei
->vfs_inode
.i_data
.writeback_index
= 0;
762 memset(&ei
->i_cached_extent
, 0, sizeof(struct ext4_ext_cache
));
763 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
764 spin_lock_init(&ei
->i_prealloc_lock
);
766 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
767 * therefore it can be null here. Don't check it, just initialize
770 jbd2_journal_init_jbd_inode(&ei
->jinode
, &ei
->vfs_inode
);
771 ei
->i_reserved_data_blocks
= 0;
772 ei
->i_reserved_meta_blocks
= 0;
773 ei
->i_allocated_meta_blocks
= 0;
774 ei
->i_da_metadata_calc_len
= 0;
775 ei
->i_delalloc_reserved_flag
= 0;
776 spin_lock_init(&(ei
->i_block_reservation_lock
));
778 ei
->i_reserved_quota
= 0;
780 INIT_LIST_HEAD(&ei
->i_completed_io_list
);
781 spin_lock_init(&ei
->i_completed_io_lock
);
782 ei
->cur_aio_dio
= NULL
;
784 ei
->i_datasync_tid
= 0;
786 return &ei
->vfs_inode
;
789 static void ext4_destroy_inode(struct inode
*inode
)
791 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
792 ext4_msg(inode
->i_sb
, KERN_ERR
,
793 "Inode %lu (%p): orphan list check failed!",
794 inode
->i_ino
, EXT4_I(inode
));
795 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
796 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
800 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
803 static void init_once(void *foo
)
805 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
807 INIT_LIST_HEAD(&ei
->i_orphan
);
808 #ifdef CONFIG_EXT4_FS_XATTR
809 init_rwsem(&ei
->xattr_sem
);
811 init_rwsem(&ei
->i_data_sem
);
812 inode_init_once(&ei
->vfs_inode
);
815 static int init_inodecache(void)
817 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
818 sizeof(struct ext4_inode_info
),
819 0, (SLAB_RECLAIM_ACCOUNT
|
822 if (ext4_inode_cachep
== NULL
)
827 static void destroy_inodecache(void)
829 kmem_cache_destroy(ext4_inode_cachep
);
832 static void ext4_clear_inode(struct inode
*inode
)
835 ext4_discard_preallocations(inode
);
836 if (EXT4_JOURNAL(inode
))
837 jbd2_journal_release_jbd_inode(EXT4_SB(inode
->i_sb
)->s_journal
,
838 &EXT4_I(inode
)->jinode
);
841 static inline void ext4_show_quota_options(struct seq_file
*seq
,
842 struct super_block
*sb
)
844 #if defined(CONFIG_QUOTA)
845 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
847 if (sbi
->s_jquota_fmt
) {
850 switch (sbi
->s_jquota_fmt
) {
861 seq_printf(seq
, ",jqfmt=%s", fmtname
);
864 if (sbi
->s_qf_names
[USRQUOTA
])
865 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
867 if (sbi
->s_qf_names
[GRPQUOTA
])
868 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
870 if (test_opt(sb
, USRQUOTA
))
871 seq_puts(seq
, ",usrquota");
873 if (test_opt(sb
, GRPQUOTA
))
874 seq_puts(seq
, ",grpquota");
880 * - it's set to a non-default value OR
881 * - if the per-sb default is different from the global default
883 static int ext4_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
886 unsigned long def_mount_opts
;
887 struct super_block
*sb
= vfs
->mnt_sb
;
888 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
889 struct ext4_super_block
*es
= sbi
->s_es
;
891 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
892 def_errors
= le16_to_cpu(es
->s_errors
);
894 if (sbi
->s_sb_block
!= 1)
895 seq_printf(seq
, ",sb=%llu", sbi
->s_sb_block
);
896 if (test_opt(sb
, MINIX_DF
))
897 seq_puts(seq
, ",minixdf");
898 if (test_opt(sb
, GRPID
) && !(def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
899 seq_puts(seq
, ",grpid");
900 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
901 seq_puts(seq
, ",nogrpid");
902 if (sbi
->s_resuid
!= EXT4_DEF_RESUID
||
903 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
) {
904 seq_printf(seq
, ",resuid=%u", sbi
->s_resuid
);
906 if (sbi
->s_resgid
!= EXT4_DEF_RESGID
||
907 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
) {
908 seq_printf(seq
, ",resgid=%u", sbi
->s_resgid
);
910 if (test_opt(sb
, ERRORS_RO
)) {
911 if (def_errors
== EXT4_ERRORS_PANIC
||
912 def_errors
== EXT4_ERRORS_CONTINUE
) {
913 seq_puts(seq
, ",errors=remount-ro");
916 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
917 seq_puts(seq
, ",errors=continue");
918 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
919 seq_puts(seq
, ",errors=panic");
920 if (test_opt(sb
, NO_UID32
) && !(def_mount_opts
& EXT4_DEFM_UID16
))
921 seq_puts(seq
, ",nouid32");
922 if (test_opt(sb
, DEBUG
) && !(def_mount_opts
& EXT4_DEFM_DEBUG
))
923 seq_puts(seq
, ",debug");
924 if (test_opt(sb
, OLDALLOC
))
925 seq_puts(seq
, ",oldalloc");
926 #ifdef CONFIG_EXT4_FS_XATTR
927 if (test_opt(sb
, XATTR_USER
) &&
928 !(def_mount_opts
& EXT4_DEFM_XATTR_USER
))
929 seq_puts(seq
, ",user_xattr");
930 if (!test_opt(sb
, XATTR_USER
) &&
931 (def_mount_opts
& EXT4_DEFM_XATTR_USER
)) {
932 seq_puts(seq
, ",nouser_xattr");
935 #ifdef CONFIG_EXT4_FS_POSIX_ACL
936 if (test_opt(sb
, POSIX_ACL
) && !(def_mount_opts
& EXT4_DEFM_ACL
))
937 seq_puts(seq
, ",acl");
938 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT4_DEFM_ACL
))
939 seq_puts(seq
, ",noacl");
941 if (sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
) {
942 seq_printf(seq
, ",commit=%u",
943 (unsigned) (sbi
->s_commit_interval
/ HZ
));
945 if (sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
) {
946 seq_printf(seq
, ",min_batch_time=%u",
947 (unsigned) sbi
->s_min_batch_time
);
949 if (sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
) {
950 seq_printf(seq
, ",max_batch_time=%u",
951 (unsigned) sbi
->s_min_batch_time
);
955 * We're changing the default of barrier mount option, so
956 * let's always display its mount state so it's clear what its
959 seq_puts(seq
, ",barrier=");
960 seq_puts(seq
, test_opt(sb
, BARRIER
) ? "1" : "0");
961 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
))
962 seq_puts(seq
, ",journal_async_commit");
963 else if (test_opt(sb
, JOURNAL_CHECKSUM
))
964 seq_puts(seq
, ",journal_checksum");
965 if (test_opt(sb
, I_VERSION
))
966 seq_puts(seq
, ",i_version");
967 if (!test_opt(sb
, DELALLOC
))
968 seq_puts(seq
, ",nodelalloc");
972 seq_printf(seq
, ",stripe=%lu", sbi
->s_stripe
);
974 * journal mode get enabled in different ways
975 * So just print the value even if we didn't specify it
977 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
978 seq_puts(seq
, ",data=journal");
979 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
980 seq_puts(seq
, ",data=ordered");
981 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
982 seq_puts(seq
, ",data=writeback");
984 if (sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
985 seq_printf(seq
, ",inode_readahead_blks=%u",
986 sbi
->s_inode_readahead_blks
);
988 if (test_opt(sb
, DATA_ERR_ABORT
))
989 seq_puts(seq
, ",data_err=abort");
991 if (test_opt(sb
, NO_AUTO_DA_ALLOC
))
992 seq_puts(seq
, ",noauto_da_alloc");
994 if (test_opt(sb
, DISCARD
))
995 seq_puts(seq
, ",discard");
997 if (test_opt(sb
, NOLOAD
))
998 seq_puts(seq
, ",norecovery");
1000 if (test_opt(sb
, DIOREAD_NOLOCK
))
1001 seq_puts(seq
, ",dioread_nolock");
1003 ext4_show_quota_options(seq
, sb
);
1008 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
1009 u64 ino
, u32 generation
)
1011 struct inode
*inode
;
1013 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
1014 return ERR_PTR(-ESTALE
);
1015 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
1016 return ERR_PTR(-ESTALE
);
1018 /* iget isn't really right if the inode is currently unallocated!!
1020 * ext4_read_inode will return a bad_inode if the inode had been
1021 * deleted, so we should be safe.
1023 * Currently we don't know the generation for parent directory, so
1024 * a generation of 0 means "accept any"
1026 inode
= ext4_iget(sb
, ino
);
1028 return ERR_CAST(inode
);
1029 if (generation
&& inode
->i_generation
!= generation
) {
1031 return ERR_PTR(-ESTALE
);
1037 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
1038 int fh_len
, int fh_type
)
1040 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
1041 ext4_nfs_get_inode
);
1044 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
1045 int fh_len
, int fh_type
)
1047 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
1048 ext4_nfs_get_inode
);
1052 * Try to release metadata pages (indirect blocks, directories) which are
1053 * mapped via the block device. Since these pages could have journal heads
1054 * which would prevent try_to_free_buffers() from freeing them, we must use
1055 * jbd2 layer's try_to_free_buffers() function to release them.
1057 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
1060 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
1062 WARN_ON(PageChecked(page
));
1063 if (!page_has_buffers(page
))
1066 return jbd2_journal_try_to_free_buffers(journal
, page
,
1067 wait
& ~__GFP_WAIT
);
1068 return try_to_free_buffers(page
);
1072 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1073 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1075 static int ext4_write_dquot(struct dquot
*dquot
);
1076 static int ext4_acquire_dquot(struct dquot
*dquot
);
1077 static int ext4_release_dquot(struct dquot
*dquot
);
1078 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1079 static int ext4_write_info(struct super_block
*sb
, int type
);
1080 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1082 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1083 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1084 size_t len
, loff_t off
);
1085 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1086 const char *data
, size_t len
, loff_t off
);
1088 static const struct dquot_operations ext4_quota_operations
= {
1090 .get_reserved_space
= ext4_get_reserved_space
,
1092 .write_dquot
= ext4_write_dquot
,
1093 .acquire_dquot
= ext4_acquire_dquot
,
1094 .release_dquot
= ext4_release_dquot
,
1095 .mark_dirty
= ext4_mark_dquot_dirty
,
1096 .write_info
= ext4_write_info
,
1097 .alloc_dquot
= dquot_alloc
,
1098 .destroy_dquot
= dquot_destroy
,
1101 static const struct quotactl_ops ext4_qctl_operations
= {
1102 .quota_on
= ext4_quota_on
,
1103 .quota_off
= dquot_quota_off
,
1104 .quota_sync
= dquot_quota_sync
,
1105 .get_info
= dquot_get_dqinfo
,
1106 .set_info
= dquot_set_dqinfo
,
1107 .get_dqblk
= dquot_get_dqblk
,
1108 .set_dqblk
= dquot_set_dqblk
1112 static const struct super_operations ext4_sops
= {
1113 .alloc_inode
= ext4_alloc_inode
,
1114 .destroy_inode
= ext4_destroy_inode
,
1115 .write_inode
= ext4_write_inode
,
1116 .dirty_inode
= ext4_dirty_inode
,
1117 .delete_inode
= ext4_delete_inode
,
1118 .put_super
= ext4_put_super
,
1119 .sync_fs
= ext4_sync_fs
,
1120 .freeze_fs
= ext4_freeze
,
1121 .unfreeze_fs
= ext4_unfreeze
,
1122 .statfs
= ext4_statfs
,
1123 .remount_fs
= ext4_remount
,
1124 .clear_inode
= ext4_clear_inode
,
1125 .show_options
= ext4_show_options
,
1127 .quota_read
= ext4_quota_read
,
1128 .quota_write
= ext4_quota_write
,
1130 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1133 static const struct super_operations ext4_nojournal_sops
= {
1134 .alloc_inode
= ext4_alloc_inode
,
1135 .destroy_inode
= ext4_destroy_inode
,
1136 .write_inode
= ext4_write_inode
,
1137 .dirty_inode
= ext4_dirty_inode
,
1138 .delete_inode
= ext4_delete_inode
,
1139 .write_super
= ext4_write_super
,
1140 .put_super
= ext4_put_super
,
1141 .statfs
= ext4_statfs
,
1142 .remount_fs
= ext4_remount
,
1143 .clear_inode
= ext4_clear_inode
,
1144 .show_options
= ext4_show_options
,
1146 .quota_read
= ext4_quota_read
,
1147 .quota_write
= ext4_quota_write
,
1149 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1152 static const struct export_operations ext4_export_ops
= {
1153 .fh_to_dentry
= ext4_fh_to_dentry
,
1154 .fh_to_parent
= ext4_fh_to_parent
,
1155 .get_parent
= ext4_get_parent
,
1159 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1160 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1161 Opt_nouid32
, Opt_debug
, Opt_oldalloc
, Opt_orlov
,
1162 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1163 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
, Opt_nobh
, Opt_bh
,
1164 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
,
1165 Opt_journal_update
, Opt_journal_dev
,
1166 Opt_journal_checksum
, Opt_journal_async_commit
,
1167 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1168 Opt_data_err_abort
, Opt_data_err_ignore
,
1169 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1170 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1171 Opt_noquota
, Opt_ignore
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1172 Opt_resize
, Opt_usrquota
, Opt_grpquota
, Opt_i_version
,
1173 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
,
1174 Opt_block_validity
, Opt_noblock_validity
,
1175 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1176 Opt_dioread_nolock
, Opt_dioread_lock
,
1177 Opt_discard
, Opt_nodiscard
,
1180 static const match_table_t tokens
= {
1181 {Opt_bsd_df
, "bsddf"},
1182 {Opt_minix_df
, "minixdf"},
1183 {Opt_grpid
, "grpid"},
1184 {Opt_grpid
, "bsdgroups"},
1185 {Opt_nogrpid
, "nogrpid"},
1186 {Opt_nogrpid
, "sysvgroups"},
1187 {Opt_resgid
, "resgid=%u"},
1188 {Opt_resuid
, "resuid=%u"},
1190 {Opt_err_cont
, "errors=continue"},
1191 {Opt_err_panic
, "errors=panic"},
1192 {Opt_err_ro
, "errors=remount-ro"},
1193 {Opt_nouid32
, "nouid32"},
1194 {Opt_debug
, "debug"},
1195 {Opt_oldalloc
, "oldalloc"},
1196 {Opt_orlov
, "orlov"},
1197 {Opt_user_xattr
, "user_xattr"},
1198 {Opt_nouser_xattr
, "nouser_xattr"},
1200 {Opt_noacl
, "noacl"},
1201 {Opt_noload
, "noload"},
1202 {Opt_noload
, "norecovery"},
1205 {Opt_commit
, "commit=%u"},
1206 {Opt_min_batch_time
, "min_batch_time=%u"},
1207 {Opt_max_batch_time
, "max_batch_time=%u"},
1208 {Opt_journal_update
, "journal=update"},
1209 {Opt_journal_dev
, "journal_dev=%u"},
1210 {Opt_journal_checksum
, "journal_checksum"},
1211 {Opt_journal_async_commit
, "journal_async_commit"},
1212 {Opt_abort
, "abort"},
1213 {Opt_data_journal
, "data=journal"},
1214 {Opt_data_ordered
, "data=ordered"},
1215 {Opt_data_writeback
, "data=writeback"},
1216 {Opt_data_err_abort
, "data_err=abort"},
1217 {Opt_data_err_ignore
, "data_err=ignore"},
1218 {Opt_offusrjquota
, "usrjquota="},
1219 {Opt_usrjquota
, "usrjquota=%s"},
1220 {Opt_offgrpjquota
, "grpjquota="},
1221 {Opt_grpjquota
, "grpjquota=%s"},
1222 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1223 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1224 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1225 {Opt_grpquota
, "grpquota"},
1226 {Opt_noquota
, "noquota"},
1227 {Opt_quota
, "quota"},
1228 {Opt_usrquota
, "usrquota"},
1229 {Opt_barrier
, "barrier=%u"},
1230 {Opt_barrier
, "barrier"},
1231 {Opt_nobarrier
, "nobarrier"},
1232 {Opt_i_version
, "i_version"},
1233 {Opt_stripe
, "stripe=%u"},
1234 {Opt_resize
, "resize"},
1235 {Opt_delalloc
, "delalloc"},
1236 {Opt_nodelalloc
, "nodelalloc"},
1237 {Opt_block_validity
, "block_validity"},
1238 {Opt_noblock_validity
, "noblock_validity"},
1239 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1240 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1241 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1242 {Opt_auto_da_alloc
, "auto_da_alloc"},
1243 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1244 {Opt_dioread_nolock
, "dioread_nolock"},
1245 {Opt_dioread_lock
, "dioread_lock"},
1246 {Opt_discard
, "discard"},
1247 {Opt_nodiscard
, "nodiscard"},
1251 static ext4_fsblk_t
get_sb_block(void **data
)
1253 ext4_fsblk_t sb_block
;
1254 char *options
= (char *) *data
;
1256 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1257 return 1; /* Default location */
1260 /* TODO: use simple_strtoll with >32bit ext4 */
1261 sb_block
= simple_strtoul(options
, &options
, 0);
1262 if (*options
&& *options
!= ',') {
1263 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1267 if (*options
== ',')
1269 *data
= (void *) options
;
1274 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1275 static char deprecated_msg
[] = "Mount option \"%s\" will be removed by %s\n"
1276 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1279 static int set_qf_name(struct super_block
*sb
, int qtype
, substring_t
*args
)
1281 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1284 if (sb_any_quota_loaded(sb
) &&
1285 !sbi
->s_qf_names
[qtype
]) {
1286 ext4_msg(sb
, KERN_ERR
,
1287 "Cannot change journaled "
1288 "quota options when quota turned on");
1291 qname
= match_strdup(args
);
1293 ext4_msg(sb
, KERN_ERR
,
1294 "Not enough memory for storing quotafile name");
1297 if (sbi
->s_qf_names
[qtype
] &&
1298 strcmp(sbi
->s_qf_names
[qtype
], qname
)) {
1299 ext4_msg(sb
, KERN_ERR
,
1300 "%s quota file already specified", QTYPE2NAME(qtype
));
1304 sbi
->s_qf_names
[qtype
] = qname
;
1305 if (strchr(sbi
->s_qf_names
[qtype
], '/')) {
1306 ext4_msg(sb
, KERN_ERR
,
1307 "quotafile must be on filesystem root");
1308 kfree(sbi
->s_qf_names
[qtype
]);
1309 sbi
->s_qf_names
[qtype
] = NULL
;
1312 set_opt(sbi
->s_mount_opt
, QUOTA
);
1316 static int clear_qf_name(struct super_block
*sb
, int qtype
)
1319 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1321 if (sb_any_quota_loaded(sb
) &&
1322 sbi
->s_qf_names
[qtype
]) {
1323 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled quota options"
1324 " when quota turned on");
1328 * The space will be released later when all options are confirmed
1331 sbi
->s_qf_names
[qtype
] = NULL
;
1336 static int parse_options(char *options
, struct super_block
*sb
,
1337 unsigned long *journal_devnum
,
1338 unsigned int *journal_ioprio
,
1339 ext4_fsblk_t
*n_blocks_count
, int is_remount
)
1341 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1343 substring_t args
[MAX_OPT_ARGS
];
1353 while ((p
= strsep(&options
, ",")) != NULL
) {
1359 * Initialize args struct so we know whether arg was
1360 * found; some options take optional arguments.
1362 args
[0].to
= args
[0].from
= 0;
1363 token
= match_token(p
, tokens
, args
);
1366 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1367 clear_opt(sbi
->s_mount_opt
, MINIX_DF
);
1370 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1371 set_opt(sbi
->s_mount_opt
, MINIX_DF
);
1375 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1376 set_opt(sbi
->s_mount_opt
, GRPID
);
1380 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1381 clear_opt(sbi
->s_mount_opt
, GRPID
);
1385 if (match_int(&args
[0], &option
))
1387 sbi
->s_resuid
= option
;
1390 if (match_int(&args
[0], &option
))
1392 sbi
->s_resgid
= option
;
1395 /* handled by get_sb_block() instead of here */
1396 /* *sb_block = match_int(&args[0]); */
1399 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1400 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1401 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1404 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1405 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1406 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1409 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1410 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1411 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1414 set_opt(sbi
->s_mount_opt
, NO_UID32
);
1417 set_opt(sbi
->s_mount_opt
, DEBUG
);
1420 set_opt(sbi
->s_mount_opt
, OLDALLOC
);
1423 clear_opt(sbi
->s_mount_opt
, OLDALLOC
);
1425 #ifdef CONFIG_EXT4_FS_XATTR
1426 case Opt_user_xattr
:
1427 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
1429 case Opt_nouser_xattr
:
1430 clear_opt(sbi
->s_mount_opt
, XATTR_USER
);
1433 case Opt_user_xattr
:
1434 case Opt_nouser_xattr
:
1435 ext4_msg(sb
, KERN_ERR
, "(no)user_xattr options not supported");
1438 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1440 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1443 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1448 ext4_msg(sb
, KERN_ERR
, "(no)acl options not supported");
1451 case Opt_journal_update
:
1453 /* Eventually we will want to be able to create
1454 a journal file here. For now, only allow the
1455 user to specify an existing inode to be the
1458 ext4_msg(sb
, KERN_ERR
,
1459 "Cannot specify journal on remount");
1462 set_opt(sbi
->s_mount_opt
, UPDATE_JOURNAL
);
1464 case Opt_journal_dev
:
1466 ext4_msg(sb
, KERN_ERR
,
1467 "Cannot specify journal on remount");
1470 if (match_int(&args
[0], &option
))
1472 *journal_devnum
= option
;
1474 case Opt_journal_checksum
:
1475 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1477 case Opt_journal_async_commit
:
1478 set_opt(sbi
->s_mount_opt
, JOURNAL_ASYNC_COMMIT
);
1479 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1482 set_opt(sbi
->s_mount_opt
, NOLOAD
);
1485 if (match_int(&args
[0], &option
))
1490 option
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1491 sbi
->s_commit_interval
= HZ
* option
;
1493 case Opt_max_batch_time
:
1494 if (match_int(&args
[0], &option
))
1499 option
= EXT4_DEF_MAX_BATCH_TIME
;
1500 sbi
->s_max_batch_time
= option
;
1502 case Opt_min_batch_time
:
1503 if (match_int(&args
[0], &option
))
1507 sbi
->s_min_batch_time
= option
;
1509 case Opt_data_journal
:
1510 data_opt
= EXT4_MOUNT_JOURNAL_DATA
;
1512 case Opt_data_ordered
:
1513 data_opt
= EXT4_MOUNT_ORDERED_DATA
;
1515 case Opt_data_writeback
:
1516 data_opt
= EXT4_MOUNT_WRITEBACK_DATA
;
1519 if (test_opt(sb
, DATA_FLAGS
) != data_opt
) {
1520 ext4_msg(sb
, KERN_ERR
,
1521 "Cannot change data mode on remount");
1525 clear_opt(sbi
->s_mount_opt
, DATA_FLAGS
);
1526 sbi
->s_mount_opt
|= data_opt
;
1529 case Opt_data_err_abort
:
1530 set_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1532 case Opt_data_err_ignore
:
1533 clear_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1537 if (!set_qf_name(sb
, USRQUOTA
, &args
[0]))
1541 if (!set_qf_name(sb
, GRPQUOTA
, &args
[0]))
1544 case Opt_offusrjquota
:
1545 if (!clear_qf_name(sb
, USRQUOTA
))
1548 case Opt_offgrpjquota
:
1549 if (!clear_qf_name(sb
, GRPQUOTA
))
1553 case Opt_jqfmt_vfsold
:
1554 qfmt
= QFMT_VFS_OLD
;
1556 case Opt_jqfmt_vfsv0
:
1559 case Opt_jqfmt_vfsv1
:
1562 if (sb_any_quota_loaded(sb
) &&
1563 sbi
->s_jquota_fmt
!= qfmt
) {
1564 ext4_msg(sb
, KERN_ERR
, "Cannot change "
1565 "journaled quota options when "
1569 sbi
->s_jquota_fmt
= qfmt
;
1573 set_opt(sbi
->s_mount_opt
, QUOTA
);
1574 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
1577 set_opt(sbi
->s_mount_opt
, QUOTA
);
1578 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1581 if (sb_any_quota_loaded(sb
)) {
1582 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1583 "options when quota turned on");
1586 clear_opt(sbi
->s_mount_opt
, QUOTA
);
1587 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1588 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1594 ext4_msg(sb
, KERN_ERR
,
1595 "quota options not supported");
1599 case Opt_offusrjquota
:
1600 case Opt_offgrpjquota
:
1601 case Opt_jqfmt_vfsold
:
1602 case Opt_jqfmt_vfsv0
:
1603 case Opt_jqfmt_vfsv1
:
1604 ext4_msg(sb
, KERN_ERR
,
1605 "journaled quota options not supported");
1611 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1614 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1618 if (match_int(&args
[0], &option
))
1621 option
= 1; /* No argument, default to 1 */
1623 set_opt(sbi
->s_mount_opt
, BARRIER
);
1625 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1631 ext4_msg(sb
, KERN_ERR
,
1632 "resize option only available "
1636 if (match_int(&args
[0], &option
) != 0)
1638 *n_blocks_count
= option
;
1641 ext4_msg(sb
, KERN_WARNING
,
1642 "Ignoring deprecated nobh option");
1645 ext4_msg(sb
, KERN_WARNING
,
1646 "Ignoring deprecated bh option");
1649 set_opt(sbi
->s_mount_opt
, I_VERSION
);
1650 sb
->s_flags
|= MS_I_VERSION
;
1652 case Opt_nodelalloc
:
1653 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
1656 if (match_int(&args
[0], &option
))
1660 sbi
->s_stripe
= option
;
1663 set_opt(sbi
->s_mount_opt
, DELALLOC
);
1665 case Opt_block_validity
:
1666 set_opt(sbi
->s_mount_opt
, BLOCK_VALIDITY
);
1668 case Opt_noblock_validity
:
1669 clear_opt(sbi
->s_mount_opt
, BLOCK_VALIDITY
);
1671 case Opt_inode_readahead_blks
:
1672 if (match_int(&args
[0], &option
))
1674 if (option
< 0 || option
> (1 << 30))
1676 if (!is_power_of_2(option
)) {
1677 ext4_msg(sb
, KERN_ERR
,
1678 "EXT4-fs: inode_readahead_blks"
1679 " must be a power of 2");
1682 sbi
->s_inode_readahead_blks
= option
;
1684 case Opt_journal_ioprio
:
1685 if (match_int(&args
[0], &option
))
1687 if (option
< 0 || option
> 7)
1689 *journal_ioprio
= IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
,
1692 case Opt_noauto_da_alloc
:
1693 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1695 case Opt_auto_da_alloc
:
1697 if (match_int(&args
[0], &option
))
1700 option
= 1; /* No argument, default to 1 */
1702 clear_opt(sbi
->s_mount_opt
, NO_AUTO_DA_ALLOC
);
1704 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1707 set_opt(sbi
->s_mount_opt
, DISCARD
);
1710 clear_opt(sbi
->s_mount_opt
, DISCARD
);
1712 case Opt_dioread_nolock
:
1713 set_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
1715 case Opt_dioread_lock
:
1716 clear_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
1719 ext4_msg(sb
, KERN_ERR
,
1720 "Unrecognized mount option \"%s\" "
1721 "or missing value", p
);
1726 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1727 if (test_opt(sb
, USRQUOTA
) && sbi
->s_qf_names
[USRQUOTA
])
1728 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1730 if (test_opt(sb
, GRPQUOTA
) && sbi
->s_qf_names
[GRPQUOTA
])
1731 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1733 if (test_opt(sb
, GRPQUOTA
) || test_opt(sb
, USRQUOTA
)) {
1734 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1739 if (!sbi
->s_jquota_fmt
) {
1740 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1745 if (sbi
->s_jquota_fmt
) {
1746 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1747 "specified with no journaling "
1756 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1759 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1762 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1763 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
1764 "forcing read-only mode");
1769 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1770 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
1771 "running e2fsck is recommended");
1772 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1773 ext4_msg(sb
, KERN_WARNING
,
1774 "warning: mounting fs with errors, "
1775 "running e2fsck is recommended");
1776 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
1777 le16_to_cpu(es
->s_mnt_count
) >=
1778 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1779 ext4_msg(sb
, KERN_WARNING
,
1780 "warning: maximal mount count reached, "
1781 "running e2fsck is recommended");
1782 else if (le32_to_cpu(es
->s_checkinterval
) &&
1783 (le32_to_cpu(es
->s_lastcheck
) +
1784 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1785 ext4_msg(sb
, KERN_WARNING
,
1786 "warning: checktime reached, "
1787 "running e2fsck is recommended");
1788 if (!sbi
->s_journal
)
1789 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1790 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1791 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1792 le16_add_cpu(&es
->s_mnt_count
, 1);
1793 es
->s_mtime
= cpu_to_le32(get_seconds());
1794 ext4_update_dynamic_rev(sb
);
1796 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1798 ext4_commit_super(sb
, 1);
1799 if (test_opt(sb
, DEBUG
))
1800 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
1801 "bpg=%lu, ipg=%lu, mo=%04x]\n",
1803 sbi
->s_groups_count
,
1804 EXT4_BLOCKS_PER_GROUP(sb
),
1805 EXT4_INODES_PER_GROUP(sb
),
1811 static int ext4_fill_flex_info(struct super_block
*sb
)
1813 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1814 struct ext4_group_desc
*gdp
= NULL
;
1815 ext4_group_t flex_group_count
;
1816 ext4_group_t flex_group
;
1817 int groups_per_flex
= 0;
1821 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1822 groups_per_flex
= 1 << sbi
->s_log_groups_per_flex
;
1824 if (groups_per_flex
< 2) {
1825 sbi
->s_log_groups_per_flex
= 0;
1829 /* We allocate both existing and potentially added groups */
1830 flex_group_count
= ((sbi
->s_groups_count
+ groups_per_flex
- 1) +
1831 ((le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
) + 1) <<
1832 EXT4_DESC_PER_BLOCK_BITS(sb
))) / groups_per_flex
;
1833 size
= flex_group_count
* sizeof(struct flex_groups
);
1834 sbi
->s_flex_groups
= kzalloc(size
, GFP_KERNEL
);
1835 if (sbi
->s_flex_groups
== NULL
) {
1836 sbi
->s_flex_groups
= vmalloc(size
);
1837 if (sbi
->s_flex_groups
)
1838 memset(sbi
->s_flex_groups
, 0, size
);
1840 if (sbi
->s_flex_groups
== NULL
) {
1841 ext4_msg(sb
, KERN_ERR
, "not enough memory for "
1842 "%u flex groups", flex_group_count
);
1846 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1847 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1849 flex_group
= ext4_flex_group(sbi
, i
);
1850 atomic_add(ext4_free_inodes_count(sb
, gdp
),
1851 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
1852 atomic_add(ext4_free_blks_count(sb
, gdp
),
1853 &sbi
->s_flex_groups
[flex_group
].free_blocks
);
1854 atomic_add(ext4_used_dirs_count(sb
, gdp
),
1855 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
1863 __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
1864 struct ext4_group_desc
*gdp
)
1868 if (sbi
->s_es
->s_feature_ro_compat
&
1869 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) {
1870 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
1871 __le32 le_group
= cpu_to_le32(block_group
);
1873 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
1874 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
1875 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
1876 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
1877 /* for checksum of struct ext4_group_desc do the rest...*/
1878 if ((sbi
->s_es
->s_feature_incompat
&
1879 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
1880 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
1881 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
1882 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
1886 return cpu_to_le16(crc
);
1889 int ext4_group_desc_csum_verify(struct ext4_sb_info
*sbi
, __u32 block_group
,
1890 struct ext4_group_desc
*gdp
)
1892 if ((sbi
->s_es
->s_feature_ro_compat
&
1893 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) &&
1894 (gdp
->bg_checksum
!= ext4_group_desc_csum(sbi
, block_group
, gdp
)))
1900 /* Called at mount-time, super-block is locked */
1901 static int ext4_check_descriptors(struct super_block
*sb
)
1903 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1904 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
1905 ext4_fsblk_t last_block
;
1906 ext4_fsblk_t block_bitmap
;
1907 ext4_fsblk_t inode_bitmap
;
1908 ext4_fsblk_t inode_table
;
1909 int flexbg_flag
= 0;
1912 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
1915 ext4_debug("Checking group descriptors");
1917 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1918 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1920 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
1921 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
1923 last_block
= first_block
+
1924 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
1926 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
1927 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
1928 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1929 "Block bitmap for group %u not in group "
1930 "(block %llu)!", i
, block_bitmap
);
1933 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
1934 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
1935 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1936 "Inode bitmap for group %u not in group "
1937 "(block %llu)!", i
, inode_bitmap
);
1940 inode_table
= ext4_inode_table(sb
, gdp
);
1941 if (inode_table
< first_block
||
1942 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
1943 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1944 "Inode table for group %u not in group "
1945 "(block %llu)!", i
, inode_table
);
1948 ext4_lock_group(sb
, i
);
1949 if (!ext4_group_desc_csum_verify(sbi
, i
, gdp
)) {
1950 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1951 "Checksum for group %u failed (%u!=%u)",
1952 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
1953 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
1954 if (!(sb
->s_flags
& MS_RDONLY
)) {
1955 ext4_unlock_group(sb
, i
);
1959 ext4_unlock_group(sb
, i
);
1961 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
1964 ext4_free_blocks_count_set(sbi
->s_es
, ext4_count_free_blocks(sb
));
1965 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
1969 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1970 * the superblock) which were deleted from all directories, but held open by
1971 * a process at the time of a crash. We walk the list and try to delete these
1972 * inodes at recovery time (only with a read-write filesystem).
1974 * In order to keep the orphan inode chain consistent during traversal (in
1975 * case of crash during recovery), we link each inode into the superblock
1976 * orphan list_head and handle it the same way as an inode deletion during
1977 * normal operation (which journals the operations for us).
1979 * We only do an iget() and an iput() on each inode, which is very safe if we
1980 * accidentally point at an in-use or already deleted inode. The worst that
1981 * can happen in this case is that we get a "bit already cleared" message from
1982 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1983 * e2fsck was run on this filesystem, and it must have already done the orphan
1984 * inode cleanup for us, so we can safely abort without any further action.
1986 static void ext4_orphan_cleanup(struct super_block
*sb
,
1987 struct ext4_super_block
*es
)
1989 unsigned int s_flags
= sb
->s_flags
;
1990 int nr_orphans
= 0, nr_truncates
= 0;
1994 if (!es
->s_last_orphan
) {
1995 jbd_debug(4, "no orphan inodes to clean up\n");
1999 if (bdev_read_only(sb
->s_bdev
)) {
2000 ext4_msg(sb
, KERN_ERR
, "write access "
2001 "unavailable, skipping orphan cleanup");
2005 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2006 if (es
->s_last_orphan
)
2007 jbd_debug(1, "Errors on filesystem, "
2008 "clearing orphan list.\n");
2009 es
->s_last_orphan
= 0;
2010 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2014 if (s_flags
& MS_RDONLY
) {
2015 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
2016 sb
->s_flags
&= ~MS_RDONLY
;
2019 /* Needed for iput() to work correctly and not trash data */
2020 sb
->s_flags
|= MS_ACTIVE
;
2021 /* Turn on quotas so that they are updated correctly */
2022 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2023 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
2024 int ret
= ext4_quota_on_mount(sb
, i
);
2026 ext4_msg(sb
, KERN_ERR
,
2027 "Cannot turn on journaled "
2028 "quota: error %d", ret
);
2033 while (es
->s_last_orphan
) {
2034 struct inode
*inode
;
2036 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
2037 if (IS_ERR(inode
)) {
2038 es
->s_last_orphan
= 0;
2042 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
2043 dquot_initialize(inode
);
2044 if (inode
->i_nlink
) {
2045 ext4_msg(sb
, KERN_DEBUG
,
2046 "%s: truncating inode %lu to %lld bytes",
2047 __func__
, inode
->i_ino
, inode
->i_size
);
2048 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2049 inode
->i_ino
, inode
->i_size
);
2050 ext4_truncate(inode
);
2053 ext4_msg(sb
, KERN_DEBUG
,
2054 "%s: deleting unreferenced inode %lu",
2055 __func__
, inode
->i_ino
);
2056 jbd_debug(2, "deleting unreferenced inode %lu\n",
2060 iput(inode
); /* The delete magic happens here! */
2063 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2066 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
2067 PLURAL(nr_orphans
));
2069 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
2070 PLURAL(nr_truncates
));
2072 /* Turn quotas off */
2073 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2074 if (sb_dqopt(sb
)->files
[i
])
2075 dquot_quota_off(sb
, i
);
2078 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
2082 * Maximal extent format file size.
2083 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2084 * extent format containers, within a sector_t, and within i_blocks
2085 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2086 * so that won't be a limiting factor.
2088 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2090 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
2093 loff_t upper_limit
= MAX_LFS_FILESIZE
;
2095 /* small i_blocks in vfs inode? */
2096 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2098 * CONFIG_LBDAF is not enabled implies the inode
2099 * i_block represent total blocks in 512 bytes
2100 * 32 == size of vfs inode i_blocks * 8
2102 upper_limit
= (1LL << 32) - 1;
2104 /* total blocks in file system block size */
2105 upper_limit
>>= (blkbits
- 9);
2106 upper_limit
<<= blkbits
;
2109 /* 32-bit extent-start container, ee_block */
2114 /* Sanity check against vm- & vfs- imposed limits */
2115 if (res
> upper_limit
)
2122 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2123 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2124 * We need to be 1 filesystem block less than the 2^48 sector limit.
2126 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2128 loff_t res
= EXT4_NDIR_BLOCKS
;
2131 /* This is calculated to be the largest file size for a dense, block
2132 * mapped file such that the file's total number of 512-byte sectors,
2133 * including data and all indirect blocks, does not exceed (2^48 - 1).
2135 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2136 * number of 512-byte sectors of the file.
2139 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2141 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2142 * the inode i_block field represents total file blocks in
2143 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2145 upper_limit
= (1LL << 32) - 1;
2147 /* total blocks in file system block size */
2148 upper_limit
>>= (bits
- 9);
2152 * We use 48 bit ext4_inode i_blocks
2153 * With EXT4_HUGE_FILE_FL set the i_blocks
2154 * represent total number of blocks in
2155 * file system block size
2157 upper_limit
= (1LL << 48) - 1;
2161 /* indirect blocks */
2163 /* double indirect blocks */
2164 meta_blocks
+= 1 + (1LL << (bits
-2));
2165 /* tripple indirect blocks */
2166 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2168 upper_limit
-= meta_blocks
;
2169 upper_limit
<<= bits
;
2171 res
+= 1LL << (bits
-2);
2172 res
+= 1LL << (2*(bits
-2));
2173 res
+= 1LL << (3*(bits
-2));
2175 if (res
> upper_limit
)
2178 if (res
> MAX_LFS_FILESIZE
)
2179 res
= MAX_LFS_FILESIZE
;
2184 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2185 ext4_fsblk_t logical_sb_block
, int nr
)
2187 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2188 ext4_group_t bg
, first_meta_bg
;
2191 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2193 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
2195 return logical_sb_block
+ nr
+ 1;
2196 bg
= sbi
->s_desc_per_block
* nr
;
2197 if (ext4_bg_has_super(sb
, bg
))
2200 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2204 * ext4_get_stripe_size: Get the stripe size.
2205 * @sbi: In memory super block info
2207 * If we have specified it via mount option, then
2208 * use the mount option value. If the value specified at mount time is
2209 * greater than the blocks per group use the super block value.
2210 * If the super block value is greater than blocks per group return 0.
2211 * Allocator needs it be less than blocks per group.
2214 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2216 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2217 unsigned long stripe_width
=
2218 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2220 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2221 return sbi
->s_stripe
;
2223 if (stripe_width
<= sbi
->s_blocks_per_group
)
2224 return stripe_width
;
2226 if (stride
<= sbi
->s_blocks_per_group
)
2235 struct attribute attr
;
2236 ssize_t (*show
)(struct ext4_attr
*, struct ext4_sb_info
*, char *);
2237 ssize_t (*store
)(struct ext4_attr
*, struct ext4_sb_info
*,
2238 const char *, size_t);
2242 static int parse_strtoul(const char *buf
,
2243 unsigned long max
, unsigned long *value
)
2247 *value
= simple_strtoul(skip_spaces(buf
), &endp
, 0);
2248 endp
= skip_spaces(endp
);
2249 if (*endp
|| *value
> max
)
2255 static ssize_t
delayed_allocation_blocks_show(struct ext4_attr
*a
,
2256 struct ext4_sb_info
*sbi
,
2259 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2260 (s64
) percpu_counter_sum(&sbi
->s_dirtyblocks_counter
));
2263 static ssize_t
session_write_kbytes_show(struct ext4_attr
*a
,
2264 struct ext4_sb_info
*sbi
, char *buf
)
2266 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2268 return snprintf(buf
, PAGE_SIZE
, "%lu\n",
2269 (part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2270 sbi
->s_sectors_written_start
) >> 1);
2273 static ssize_t
lifetime_write_kbytes_show(struct ext4_attr
*a
,
2274 struct ext4_sb_info
*sbi
, char *buf
)
2276 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2278 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2279 (unsigned long long)(sbi
->s_kbytes_written
+
2280 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2281 EXT4_SB(sb
)->s_sectors_written_start
) >> 1)));
2284 static ssize_t
inode_readahead_blks_store(struct ext4_attr
*a
,
2285 struct ext4_sb_info
*sbi
,
2286 const char *buf
, size_t count
)
2290 if (parse_strtoul(buf
, 0x40000000, &t
))
2293 if (!is_power_of_2(t
))
2296 sbi
->s_inode_readahead_blks
= t
;
2300 static ssize_t
sbi_ui_show(struct ext4_attr
*a
,
2301 struct ext4_sb_info
*sbi
, char *buf
)
2303 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2305 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
2308 static ssize_t
sbi_ui_store(struct ext4_attr
*a
,
2309 struct ext4_sb_info
*sbi
,
2310 const char *buf
, size_t count
)
2312 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2315 if (parse_strtoul(buf
, 0xffffffff, &t
))
2321 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2322 static struct ext4_attr ext4_attr_##_name = { \
2323 .attr = {.name = __stringify(_name), .mode = _mode }, \
2326 .offset = offsetof(struct ext4_sb_info, _elname), \
2328 #define EXT4_ATTR(name, mode, show, store) \
2329 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2331 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2332 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2333 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2334 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2335 #define ATTR_LIST(name) &ext4_attr_##name.attr
2337 EXT4_RO_ATTR(delayed_allocation_blocks
);
2338 EXT4_RO_ATTR(session_write_kbytes
);
2339 EXT4_RO_ATTR(lifetime_write_kbytes
);
2340 EXT4_ATTR_OFFSET(inode_readahead_blks
, 0644, sbi_ui_show
,
2341 inode_readahead_blks_store
, s_inode_readahead_blks
);
2342 EXT4_RW_ATTR_SBI_UI(inode_goal
, s_inode_goal
);
2343 EXT4_RW_ATTR_SBI_UI(mb_stats
, s_mb_stats
);
2344 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan
, s_mb_max_to_scan
);
2345 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan
, s_mb_min_to_scan
);
2346 EXT4_RW_ATTR_SBI_UI(mb_order2_req
, s_mb_order2_reqs
);
2347 EXT4_RW_ATTR_SBI_UI(mb_stream_req
, s_mb_stream_request
);
2348 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc
, s_mb_group_prealloc
);
2349 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump
, s_max_writeback_mb_bump
);
2351 static struct attribute
*ext4_attrs
[] = {
2352 ATTR_LIST(delayed_allocation_blocks
),
2353 ATTR_LIST(session_write_kbytes
),
2354 ATTR_LIST(lifetime_write_kbytes
),
2355 ATTR_LIST(inode_readahead_blks
),
2356 ATTR_LIST(inode_goal
),
2357 ATTR_LIST(mb_stats
),
2358 ATTR_LIST(mb_max_to_scan
),
2359 ATTR_LIST(mb_min_to_scan
),
2360 ATTR_LIST(mb_order2_req
),
2361 ATTR_LIST(mb_stream_req
),
2362 ATTR_LIST(mb_group_prealloc
),
2363 ATTR_LIST(max_writeback_mb_bump
),
2367 static ssize_t
ext4_attr_show(struct kobject
*kobj
,
2368 struct attribute
*attr
, char *buf
)
2370 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2372 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2374 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
2377 static ssize_t
ext4_attr_store(struct kobject
*kobj
,
2378 struct attribute
*attr
,
2379 const char *buf
, size_t len
)
2381 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2383 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2385 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
2388 static void ext4_sb_release(struct kobject
*kobj
)
2390 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2392 complete(&sbi
->s_kobj_unregister
);
2396 static const struct sysfs_ops ext4_attr_ops
= {
2397 .show
= ext4_attr_show
,
2398 .store
= ext4_attr_store
,
2401 static struct kobj_type ext4_ktype
= {
2402 .default_attrs
= ext4_attrs
,
2403 .sysfs_ops
= &ext4_attr_ops
,
2404 .release
= ext4_sb_release
,
2408 * Check whether this filesystem can be mounted based on
2409 * the features present and the RDONLY/RDWR mount requested.
2410 * Returns 1 if this filesystem can be mounted as requested,
2411 * 0 if it cannot be.
2413 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2415 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
)) {
2416 ext4_msg(sb
, KERN_ERR
,
2417 "Couldn't mount because of "
2418 "unsupported optional features (%x)",
2419 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2420 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2427 /* Check that feature set is OK for a read-write mount */
2428 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
)) {
2429 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2430 "unsupported optional features (%x)",
2431 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2432 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2436 * Large file size enabled file system can only be mounted
2437 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2439 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
2440 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2441 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2442 "cannot be mounted RDWR without "
2450 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
2451 __releases(kernel_lock
)
2452 __acquires(kernel_lock
)
2454 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
2455 struct buffer_head
*bh
;
2456 struct ext4_super_block
*es
= NULL
;
2457 struct ext4_sb_info
*sbi
;
2459 ext4_fsblk_t sb_block
= get_sb_block(&data
);
2460 ext4_fsblk_t logical_sb_block
;
2461 unsigned long offset
= 0;
2462 unsigned long journal_devnum
= 0;
2463 unsigned long def_mount_opts
;
2469 unsigned int db_count
;
2471 int needs_recovery
, has_huge_files
;
2474 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
2476 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
2480 sbi
->s_blockgroup_lock
=
2481 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
2482 if (!sbi
->s_blockgroup_lock
) {
2486 sb
->s_fs_info
= sbi
;
2487 sbi
->s_mount_opt
= 0;
2488 sbi
->s_resuid
= EXT4_DEF_RESUID
;
2489 sbi
->s_resgid
= EXT4_DEF_RESGID
;
2490 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
2491 sbi
->s_sb_block
= sb_block
;
2492 sbi
->s_sectors_written_start
= part_stat_read(sb
->s_bdev
->bd_part
,
2497 /* Cleanup superblock name */
2498 for (cp
= sb
->s_id
; (cp
= strchr(cp
, '/'));)
2501 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
2503 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
2508 * The ext4 superblock will not be buffer aligned for other than 1kB
2509 * block sizes. We need to calculate the offset from buffer start.
2511 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
2512 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2513 offset
= do_div(logical_sb_block
, blocksize
);
2515 logical_sb_block
= sb_block
;
2518 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
2519 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
2523 * Note: s_es must be initialized as soon as possible because
2524 * some ext4 macro-instructions depend on its value
2526 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
2528 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
2529 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
2531 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
2533 /* Set defaults before we parse the mount options */
2534 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
2535 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
2536 set_opt(sbi
->s_mount_opt
, DEBUG
);
2537 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
) {
2538 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, "bsdgroups",
2540 set_opt(sbi
->s_mount_opt
, GRPID
);
2542 if (def_mount_opts
& EXT4_DEFM_UID16
)
2543 set_opt(sbi
->s_mount_opt
, NO_UID32
);
2544 #ifdef CONFIG_EXT4_FS_XATTR
2545 if (def_mount_opts
& EXT4_DEFM_XATTR_USER
)
2546 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
2548 #ifdef CONFIG_EXT4_FS_POSIX_ACL
2549 if (def_mount_opts
& EXT4_DEFM_ACL
)
2550 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
2552 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
2553 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
2554 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
2555 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
2556 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
2557 set_opt(sbi
->s_mount_opt
, WRITEBACK_DATA
);
2559 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
2560 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
2561 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
2562 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
2564 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
2566 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
2567 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
2568 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
2569 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
2570 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
2572 set_opt(sbi
->s_mount_opt
, BARRIER
);
2575 * enable delayed allocation by default
2576 * Use -o nodelalloc to turn it off
2578 if (!IS_EXT3_SB(sb
))
2579 set_opt(sbi
->s_mount_opt
, DELALLOC
);
2581 if (!parse_options((char *) data
, sb
, &journal_devnum
,
2582 &journal_ioprio
, NULL
, 0))
2585 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
2586 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
2588 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
2589 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
2590 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
2591 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
2592 ext4_msg(sb
, KERN_WARNING
,
2593 "feature flags set on rev 0 fs, "
2594 "running e2fsck is recommended");
2597 * Check feature flags regardless of the revision level, since we
2598 * previously didn't change the revision level when setting the flags,
2599 * so there is a chance incompat flags are set on a rev 0 filesystem.
2601 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
2604 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
2606 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
2607 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
2608 ext4_msg(sb
, KERN_ERR
,
2609 "Unsupported filesystem blocksize %d", blocksize
);
2613 if (sb
->s_blocksize
!= blocksize
) {
2614 /* Validate the filesystem blocksize */
2615 if (!sb_set_blocksize(sb
, blocksize
)) {
2616 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
2622 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2623 offset
= do_div(logical_sb_block
, blocksize
);
2624 bh
= sb_bread(sb
, logical_sb_block
);
2626 ext4_msg(sb
, KERN_ERR
,
2627 "Can't read superblock on 2nd try");
2630 es
= (struct ext4_super_block
*)(((char *)bh
->b_data
) + offset
);
2632 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
2633 ext4_msg(sb
, KERN_ERR
,
2634 "Magic mismatch, very weird!");
2639 has_huge_files
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2640 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
);
2641 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
2643 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
2645 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
2646 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
2647 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
2649 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
2650 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
2651 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
2652 (!is_power_of_2(sbi
->s_inode_size
)) ||
2653 (sbi
->s_inode_size
> blocksize
)) {
2654 ext4_msg(sb
, KERN_ERR
,
2655 "unsupported inode size: %d",
2659 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
2660 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
2663 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
2664 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
2665 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
2666 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
2667 !is_power_of_2(sbi
->s_desc_size
)) {
2668 ext4_msg(sb
, KERN_ERR
,
2669 "unsupported descriptor size %lu",
2674 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
2676 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
2677 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
2678 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
2681 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
2682 if (sbi
->s_inodes_per_block
== 0)
2684 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
2685 sbi
->s_inodes_per_block
;
2686 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
2688 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
2689 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
2690 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
2692 for (i
= 0; i
< 4; i
++)
2693 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
2694 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
2695 i
= le32_to_cpu(es
->s_flags
);
2696 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
2697 sbi
->s_hash_unsigned
= 3;
2698 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
2699 #ifdef __CHAR_UNSIGNED__
2700 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
2701 sbi
->s_hash_unsigned
= 3;
2703 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
2708 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
2709 ext4_msg(sb
, KERN_ERR
,
2710 "#blocks per group too big: %lu",
2711 sbi
->s_blocks_per_group
);
2714 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
2715 ext4_msg(sb
, KERN_ERR
,
2716 "#inodes per group too big: %lu",
2717 sbi
->s_inodes_per_group
);
2722 * Test whether we have more sectors than will fit in sector_t,
2723 * and whether the max offset is addressable by the page cache.
2725 if ((ext4_blocks_count(es
) >
2726 (sector_t
)(~0ULL) >> (sb
->s_blocksize_bits
- 9)) ||
2727 (ext4_blocks_count(es
) >
2728 (pgoff_t
)(~0ULL) >> (PAGE_CACHE_SHIFT
- sb
->s_blocksize_bits
))) {
2729 ext4_msg(sb
, KERN_ERR
, "filesystem"
2730 " too large to mount safely on this system");
2731 if (sizeof(sector_t
) < 8)
2732 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
2737 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
2740 /* check blocks count against device size */
2741 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
2742 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
2743 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
2744 "exceeds size of device (%llu blocks)",
2745 ext4_blocks_count(es
), blocks_count
);
2750 * It makes no sense for the first data block to be beyond the end
2751 * of the filesystem.
2753 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
2754 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data"
2755 "block %u is beyond end of filesystem (%llu)",
2756 le32_to_cpu(es
->s_first_data_block
),
2757 ext4_blocks_count(es
));
2760 blocks_count
= (ext4_blocks_count(es
) -
2761 le32_to_cpu(es
->s_first_data_block
) +
2762 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2763 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
2764 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
2765 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
2766 "(block count %llu, first data block %u, "
2767 "blocks per group %lu)", sbi
->s_groups_count
,
2768 ext4_blocks_count(es
),
2769 le32_to_cpu(es
->s_first_data_block
),
2770 EXT4_BLOCKS_PER_GROUP(sb
));
2773 sbi
->s_groups_count
= blocks_count
;
2774 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
2775 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
2776 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
2777 EXT4_DESC_PER_BLOCK(sb
);
2778 sbi
->s_group_desc
= kmalloc(db_count
* sizeof(struct buffer_head
*),
2780 if (sbi
->s_group_desc
== NULL
) {
2781 ext4_msg(sb
, KERN_ERR
, "not enough memory");
2785 #ifdef CONFIG_PROC_FS
2787 sbi
->s_proc
= proc_mkdir(sb
->s_id
, ext4_proc_root
);
2790 bgl_lock_init(sbi
->s_blockgroup_lock
);
2792 for (i
= 0; i
< db_count
; i
++) {
2793 block
= descriptor_loc(sb
, logical_sb_block
, i
);
2794 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
2795 if (!sbi
->s_group_desc
[i
]) {
2796 ext4_msg(sb
, KERN_ERR
,
2797 "can't read group descriptor %d", i
);
2802 if (!ext4_check_descriptors(sb
)) {
2803 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
2806 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
2807 if (!ext4_fill_flex_info(sb
)) {
2808 ext4_msg(sb
, KERN_ERR
,
2809 "unable to initialize "
2810 "flex_bg meta info!");
2814 sbi
->s_gdb_count
= db_count
;
2815 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
2816 spin_lock_init(&sbi
->s_next_gen_lock
);
2818 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
2819 sbi
->s_max_writeback_mb_bump
= 128;
2822 * set up enough so that it can read an inode
2824 if (!test_opt(sb
, NOLOAD
) &&
2825 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
2826 sb
->s_op
= &ext4_sops
;
2828 sb
->s_op
= &ext4_nojournal_sops
;
2829 sb
->s_export_op
= &ext4_export_ops
;
2830 sb
->s_xattr
= ext4_xattr_handlers
;
2832 sb
->s_qcop
= &ext4_qctl_operations
;
2833 sb
->dq_op
= &ext4_quota_operations
;
2835 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
2836 mutex_init(&sbi
->s_orphan_lock
);
2837 mutex_init(&sbi
->s_resize_lock
);
2841 needs_recovery
= (es
->s_last_orphan
!= 0 ||
2842 EXT4_HAS_INCOMPAT_FEATURE(sb
,
2843 EXT4_FEATURE_INCOMPAT_RECOVER
));
2846 * The first inode we look at is the journal inode. Don't try
2847 * root first: it may be modified in the journal!
2849 if (!test_opt(sb
, NOLOAD
) &&
2850 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
2851 if (ext4_load_journal(sb
, es
, journal_devnum
))
2853 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
2854 EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
2855 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
2856 "suppressed and not mounted read-only");
2857 goto failed_mount_wq
;
2859 clear_opt(sbi
->s_mount_opt
, DATA_FLAGS
);
2860 set_opt(sbi
->s_mount_opt
, WRITEBACK_DATA
);
2861 sbi
->s_journal
= NULL
;
2866 if (ext4_blocks_count(es
) > 0xffffffffULL
&&
2867 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
2868 JBD2_FEATURE_INCOMPAT_64BIT
)) {
2869 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
2870 goto failed_mount_wq
;
2873 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
2874 jbd2_journal_set_features(sbi
->s_journal
,
2875 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2876 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2877 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
2878 jbd2_journal_set_features(sbi
->s_journal
,
2879 JBD2_FEATURE_COMPAT_CHECKSUM
, 0, 0);
2880 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
2881 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2883 jbd2_journal_clear_features(sbi
->s_journal
,
2884 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2885 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2888 /* We have now updated the journal if required, so we can
2889 * validate the data journaling mode. */
2890 switch (test_opt(sb
, DATA_FLAGS
)) {
2892 /* No mode set, assume a default based on the journal
2893 * capabilities: ORDERED_DATA if the journal can
2894 * cope, else JOURNAL_DATA
2896 if (jbd2_journal_check_available_features
2897 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
2898 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
2900 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
2903 case EXT4_MOUNT_ORDERED_DATA
:
2904 case EXT4_MOUNT_WRITEBACK_DATA
:
2905 if (!jbd2_journal_check_available_features
2906 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
2907 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
2908 "requested data journaling mode");
2909 goto failed_mount_wq
;
2914 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
2917 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
2918 ext4_count_free_blocks(sb
));
2920 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
2921 ext4_count_free_inodes(sb
));
2923 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
2924 ext4_count_dirs(sb
));
2926 err
= percpu_counter_init(&sbi
->s_dirtyblocks_counter
, 0);
2928 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
2929 goto failed_mount_wq
;
2932 EXT4_SB(sb
)->dio_unwritten_wq
= create_workqueue("ext4-dio-unwritten");
2933 if (!EXT4_SB(sb
)->dio_unwritten_wq
) {
2934 printk(KERN_ERR
"EXT4-fs: failed to create DIO workqueue\n");
2935 goto failed_mount_wq
;
2939 * The jbd2_journal_load will have done any necessary log recovery,
2940 * so we can safely mount the rest of the filesystem now.
2943 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
2945 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
2946 ret
= PTR_ERR(root
);
2949 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
2951 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
2954 sb
->s_root
= d_alloc_root(root
);
2956 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
2962 ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
);
2964 /* determine the minimum size of new large inodes, if present */
2965 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
2966 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2967 EXT4_GOOD_OLD_INODE_SIZE
;
2968 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2969 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
2970 if (sbi
->s_want_extra_isize
<
2971 le16_to_cpu(es
->s_want_extra_isize
))
2972 sbi
->s_want_extra_isize
=
2973 le16_to_cpu(es
->s_want_extra_isize
);
2974 if (sbi
->s_want_extra_isize
<
2975 le16_to_cpu(es
->s_min_extra_isize
))
2976 sbi
->s_want_extra_isize
=
2977 le16_to_cpu(es
->s_min_extra_isize
);
2980 /* Check if enough inode space is available */
2981 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
2982 sbi
->s_inode_size
) {
2983 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2984 EXT4_GOOD_OLD_INODE_SIZE
;
2985 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
2989 if (test_opt(sb
, DELALLOC
) &&
2990 (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)) {
2991 ext4_msg(sb
, KERN_WARNING
, "Ignoring delalloc option - "
2992 "requested data journaling mode");
2993 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
2995 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
2996 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
2997 ext4_msg(sb
, KERN_WARNING
, "Ignoring dioread_nolock "
2998 "option - requested data journaling mode");
2999 clear_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
3001 if (sb
->s_blocksize
< PAGE_SIZE
) {
3002 ext4_msg(sb
, KERN_WARNING
, "Ignoring dioread_nolock "
3003 "option - block size is too small");
3004 clear_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
3008 err
= ext4_setup_system_zone(sb
);
3010 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
3016 err
= ext4_mb_init(sb
, needs_recovery
);
3018 ext4_msg(sb
, KERN_ERR
, "failed to initalize mballoc (%d)",
3023 sbi
->s_kobj
.kset
= ext4_kset
;
3024 init_completion(&sbi
->s_kobj_unregister
);
3025 err
= kobject_init_and_add(&sbi
->s_kobj
, &ext4_ktype
, NULL
,
3028 ext4_mb_release(sb
);
3029 ext4_ext_release(sb
);
3033 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
3034 ext4_orphan_cleanup(sb
, es
);
3035 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
3036 if (needs_recovery
) {
3037 ext4_msg(sb
, KERN_INFO
, "recovery complete");
3038 ext4_mark_recovery_complete(sb
, es
);
3040 if (EXT4_SB(sb
)->s_journal
) {
3041 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
3042 descr
= " journalled data mode";
3043 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
3044 descr
= " ordered data mode";
3046 descr
= " writeback data mode";
3048 descr
= "out journal";
3050 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s. "
3051 "Opts: %s", descr
, orig_data
);
3059 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
3063 ext4_msg(sb
, KERN_ERR
, "mount failed");
3064 destroy_workqueue(EXT4_SB(sb
)->dio_unwritten_wq
);
3066 ext4_release_system_zone(sb
);
3067 if (sbi
->s_journal
) {
3068 jbd2_journal_destroy(sbi
->s_journal
);
3069 sbi
->s_journal
= NULL
;
3071 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
3072 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
3073 percpu_counter_destroy(&sbi
->s_dirs_counter
);
3074 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
3076 if (sbi
->s_flex_groups
) {
3077 if (is_vmalloc_addr(sbi
->s_flex_groups
))
3078 vfree(sbi
->s_flex_groups
);
3080 kfree(sbi
->s_flex_groups
);
3083 for (i
= 0; i
< db_count
; i
++)
3084 brelse(sbi
->s_group_desc
[i
]);
3085 kfree(sbi
->s_group_desc
);
3088 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
3091 for (i
= 0; i
< MAXQUOTAS
; i
++)
3092 kfree(sbi
->s_qf_names
[i
]);
3094 ext4_blkdev_remove(sbi
);
3097 sb
->s_fs_info
= NULL
;
3098 kfree(sbi
->s_blockgroup_lock
);
3106 * Setup any per-fs journal parameters now. We'll do this both on
3107 * initial mount, once the journal has been initialised but before we've
3108 * done any recovery; and again on any subsequent remount.
3110 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
3112 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3114 journal
->j_commit_interval
= sbi
->s_commit_interval
;
3115 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
3116 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
3118 spin_lock(&journal
->j_state_lock
);
3119 if (test_opt(sb
, BARRIER
))
3120 journal
->j_flags
|= JBD2_BARRIER
;
3122 journal
->j_flags
&= ~JBD2_BARRIER
;
3123 if (test_opt(sb
, DATA_ERR_ABORT
))
3124 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
3126 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
3127 spin_unlock(&journal
->j_state_lock
);
3130 static journal_t
*ext4_get_journal(struct super_block
*sb
,
3131 unsigned int journal_inum
)
3133 struct inode
*journal_inode
;
3136 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3138 /* First, test for the existence of a valid inode on disk. Bad
3139 * things happen if we iget() an unused inode, as the subsequent
3140 * iput() will try to delete it. */
3142 journal_inode
= ext4_iget(sb
, journal_inum
);
3143 if (IS_ERR(journal_inode
)) {
3144 ext4_msg(sb
, KERN_ERR
, "no journal found");
3147 if (!journal_inode
->i_nlink
) {
3148 make_bad_inode(journal_inode
);
3149 iput(journal_inode
);
3150 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
3154 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3155 journal_inode
, journal_inode
->i_size
);
3156 if (!S_ISREG(journal_inode
->i_mode
)) {
3157 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
3158 iput(journal_inode
);
3162 journal
= jbd2_journal_init_inode(journal_inode
);
3164 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
3165 iput(journal_inode
);
3168 journal
->j_private
= sb
;
3169 ext4_init_journal_params(sb
, journal
);
3173 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
3176 struct buffer_head
*bh
;
3180 int hblock
, blocksize
;
3181 ext4_fsblk_t sb_block
;
3182 unsigned long offset
;
3183 struct ext4_super_block
*es
;
3184 struct block_device
*bdev
;
3186 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3188 bdev
= ext4_blkdev_get(j_dev
, sb
);
3192 if (bd_claim(bdev
, sb
)) {
3193 ext4_msg(sb
, KERN_ERR
,
3194 "failed to claim external journal device");
3195 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
3199 blocksize
= sb
->s_blocksize
;
3200 hblock
= bdev_logical_block_size(bdev
);
3201 if (blocksize
< hblock
) {
3202 ext4_msg(sb
, KERN_ERR
,
3203 "blocksize too small for journal device");
3207 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
3208 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
3209 set_blocksize(bdev
, blocksize
);
3210 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
3211 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
3212 "external journal");
3216 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
3217 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
3218 !(le32_to_cpu(es
->s_feature_incompat
) &
3219 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
3220 ext4_msg(sb
, KERN_ERR
, "external journal has "
3226 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
3227 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
3232 len
= ext4_blocks_count(es
);
3233 start
= sb_block
+ 1;
3234 brelse(bh
); /* we're done with the superblock */
3236 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
3237 start
, len
, blocksize
);
3239 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
3242 journal
->j_private
= sb
;
3243 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
3244 wait_on_buffer(journal
->j_sb_buffer
);
3245 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
3246 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
3249 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
3250 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
3251 "user (unsupported) - %d",
3252 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
3255 EXT4_SB(sb
)->journal_bdev
= bdev
;
3256 ext4_init_journal_params(sb
, journal
);
3260 jbd2_journal_destroy(journal
);
3262 ext4_blkdev_put(bdev
);
3266 static int ext4_load_journal(struct super_block
*sb
,
3267 struct ext4_super_block
*es
,
3268 unsigned long journal_devnum
)
3271 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
3274 int really_read_only
;
3276 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3278 if (journal_devnum
&&
3279 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3280 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
3281 "numbers have changed");
3282 journal_dev
= new_decode_dev(journal_devnum
);
3284 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
3286 really_read_only
= bdev_read_only(sb
->s_bdev
);
3289 * Are we loading a blank journal or performing recovery after a
3290 * crash? For recovery, we need to check in advance whether we
3291 * can get read-write access to the device.
3293 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3294 if (sb
->s_flags
& MS_RDONLY
) {
3295 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
3296 "required on readonly filesystem");
3297 if (really_read_only
) {
3298 ext4_msg(sb
, KERN_ERR
, "write access "
3299 "unavailable, cannot proceed");
3302 ext4_msg(sb
, KERN_INFO
, "write access will "
3303 "be enabled during recovery");
3307 if (journal_inum
&& journal_dev
) {
3308 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
3309 "and inode journals!");
3314 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
3317 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
3321 if (!(journal
->j_flags
& JBD2_BARRIER
))
3322 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
3324 if (!really_read_only
&& test_opt(sb
, UPDATE_JOURNAL
)) {
3325 err
= jbd2_journal_update_format(journal
);
3327 ext4_msg(sb
, KERN_ERR
, "error updating journal");
3328 jbd2_journal_destroy(journal
);
3333 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
3334 err
= jbd2_journal_wipe(journal
, !really_read_only
);
3336 err
= jbd2_journal_load(journal
);
3339 ext4_msg(sb
, KERN_ERR
, "error loading journal");
3340 jbd2_journal_destroy(journal
);
3344 EXT4_SB(sb
)->s_journal
= journal
;
3345 ext4_clear_journal_err(sb
, es
);
3347 if (journal_devnum
&&
3348 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3349 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
3351 /* Make sure we flush the recovery flag to disk. */
3352 ext4_commit_super(sb
, 1);
3358 static int ext4_commit_super(struct super_block
*sb
, int sync
)
3360 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
3361 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
3366 if (buffer_write_io_error(sbh
)) {
3368 * Oh, dear. A previous attempt to write the
3369 * superblock failed. This could happen because the
3370 * USB device was yanked out. Or it could happen to
3371 * be a transient write error and maybe the block will
3372 * be remapped. Nothing we can do but to retry the
3373 * write and hope for the best.
3375 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
3376 "superblock detected");
3377 clear_buffer_write_io_error(sbh
);
3378 set_buffer_uptodate(sbh
);
3381 * If the file system is mounted read-only, don't update the
3382 * superblock write time. This avoids updating the superblock
3383 * write time when we are mounting the root file system
3384 * read/only but we need to replay the journal; at that point,
3385 * for people who are east of GMT and who make their clock
3386 * tick in localtime for Windows bug-for-bug compatibility,
3387 * the clock is set in the future, and this will cause e2fsck
3388 * to complain and force a full file system check.
3390 if (!(sb
->s_flags
& MS_RDONLY
))
3391 es
->s_wtime
= cpu_to_le32(get_seconds());
3392 es
->s_kbytes_written
=
3393 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
3394 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
3395 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
3396 ext4_free_blocks_count_set(es
, percpu_counter_sum_positive(
3397 &EXT4_SB(sb
)->s_freeblocks_counter
));
3398 es
->s_free_inodes_count
= cpu_to_le32(percpu_counter_sum_positive(
3399 &EXT4_SB(sb
)->s_freeinodes_counter
));
3401 BUFFER_TRACE(sbh
, "marking dirty");
3402 mark_buffer_dirty(sbh
);
3404 error
= sync_dirty_buffer(sbh
);
3408 error
= buffer_write_io_error(sbh
);
3410 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
3412 clear_buffer_write_io_error(sbh
);
3413 set_buffer_uptodate(sbh
);
3420 * Have we just finished recovery? If so, and if we are mounting (or
3421 * remounting) the filesystem readonly, then we will end up with a
3422 * consistent fs on disk. Record that fact.
3424 static void ext4_mark_recovery_complete(struct super_block
*sb
,
3425 struct ext4_super_block
*es
)
3427 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
3429 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
3430 BUG_ON(journal
!= NULL
);
3433 jbd2_journal_lock_updates(journal
);
3434 if (jbd2_journal_flush(journal
) < 0)
3437 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
3438 sb
->s_flags
& MS_RDONLY
) {
3439 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3440 ext4_commit_super(sb
, 1);
3444 jbd2_journal_unlock_updates(journal
);
3448 * If we are mounting (or read-write remounting) a filesystem whose journal
3449 * has recorded an error from a previous lifetime, move that error to the
3450 * main filesystem now.
3452 static void ext4_clear_journal_err(struct super_block
*sb
,
3453 struct ext4_super_block
*es
)
3459 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3461 journal
= EXT4_SB(sb
)->s_journal
;
3464 * Now check for any error status which may have been recorded in the
3465 * journal by a prior ext4_error() or ext4_abort()
3468 j_errno
= jbd2_journal_errno(journal
);
3472 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
3473 ext4_warning(sb
, "Filesystem error recorded "
3474 "from previous mount: %s", errstr
);
3475 ext4_warning(sb
, "Marking fs in need of filesystem check.");
3477 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
3478 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
3479 ext4_commit_super(sb
, 1);
3481 jbd2_journal_clear_err(journal
);
3486 * Force the running and committing transactions to commit,
3487 * and wait on the commit.
3489 int ext4_force_commit(struct super_block
*sb
)
3494 if (sb
->s_flags
& MS_RDONLY
)
3497 journal
= EXT4_SB(sb
)->s_journal
;
3499 vfs_check_frozen(sb
, SB_FREEZE_WRITE
);
3500 ret
= ext4_journal_force_commit(journal
);
3506 static void ext4_write_super(struct super_block
*sb
)
3509 ext4_commit_super(sb
, 1);
3513 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
3517 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3519 trace_ext4_sync_fs(sb
, wait
);
3520 flush_workqueue(sbi
->dio_unwritten_wq
);
3521 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
3523 jbd2_log_wait_commit(sbi
->s_journal
, target
);
3529 * LVM calls this function before a (read-only) snapshot is created. This
3530 * gives us a chance to flush the journal completely and mark the fs clean.
3532 static int ext4_freeze(struct super_block
*sb
)
3537 if (sb
->s_flags
& MS_RDONLY
)
3540 journal
= EXT4_SB(sb
)->s_journal
;
3542 /* Now we set up the journal barrier. */
3543 jbd2_journal_lock_updates(journal
);
3546 * Don't clear the needs_recovery flag if we failed to flush
3549 error
= jbd2_journal_flush(journal
);
3553 /* Journal blocked and flushed, clear needs_recovery flag. */
3554 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3555 error
= ext4_commit_super(sb
, 1);
3557 /* we rely on s_frozen to stop further updates */
3558 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
3563 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3564 * flag here, even though the filesystem is not technically dirty yet.
3566 static int ext4_unfreeze(struct super_block
*sb
)
3568 if (sb
->s_flags
& MS_RDONLY
)
3572 /* Reset the needs_recovery flag before the fs is unlocked. */
3573 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3574 ext4_commit_super(sb
, 1);
3579 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
3581 struct ext4_super_block
*es
;
3582 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3583 ext4_fsblk_t n_blocks_count
= 0;
3584 unsigned long old_sb_flags
;
3585 struct ext4_mount_options old_opts
;
3586 int enable_quota
= 0;
3588 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3593 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
3597 /* Store the original options */
3599 old_sb_flags
= sb
->s_flags
;
3600 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
3601 old_opts
.s_resuid
= sbi
->s_resuid
;
3602 old_opts
.s_resgid
= sbi
->s_resgid
;
3603 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
3604 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
3605 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
3607 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
3608 for (i
= 0; i
< MAXQUOTAS
; i
++)
3609 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
3611 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
3612 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
3615 * Allow the "check" option to be passed as a remount option.
3617 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
,
3618 &n_blocks_count
, 1)) {
3623 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
3624 ext4_abort(sb
, "Abort forced by user");
3626 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3627 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
3631 if (sbi
->s_journal
) {
3632 ext4_init_journal_params(sb
, sbi
->s_journal
);
3633 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
3636 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
) ||
3637 n_blocks_count
> ext4_blocks_count(es
)) {
3638 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
3643 if (*flags
& MS_RDONLY
) {
3644 err
= dquot_suspend(sb
, -1);
3649 * First of all, the unconditional stuff we have to do
3650 * to disable replay of the journal when we next remount
3652 sb
->s_flags
|= MS_RDONLY
;
3655 * OK, test if we are remounting a valid rw partition
3656 * readonly, and if so set the rdonly flag and then
3657 * mark the partition as valid again.
3659 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
3660 (sbi
->s_mount_state
& EXT4_VALID_FS
))
3661 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
3664 ext4_mark_recovery_complete(sb
, es
);
3666 /* Make sure we can mount this feature set readwrite */
3667 if (!ext4_feature_set_ok(sb
, 0)) {
3672 * Make sure the group descriptor checksums
3673 * are sane. If they aren't, refuse to remount r/w.
3675 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
3676 struct ext4_group_desc
*gdp
=
3677 ext4_get_group_desc(sb
, g
, NULL
);
3679 if (!ext4_group_desc_csum_verify(sbi
, g
, gdp
)) {
3680 ext4_msg(sb
, KERN_ERR
,
3681 "ext4_remount: Checksum for group %u failed (%u!=%u)",
3682 g
, le16_to_cpu(ext4_group_desc_csum(sbi
, g
, gdp
)),
3683 le16_to_cpu(gdp
->bg_checksum
));
3690 * If we have an unprocessed orphan list hanging
3691 * around from a previously readonly bdev mount,
3692 * require a full umount/remount for now.
3694 if (es
->s_last_orphan
) {
3695 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
3696 "remount RDWR because of unprocessed "
3697 "orphan inode list. Please "
3698 "umount/remount instead");
3704 * Mounting a RDONLY partition read-write, so reread
3705 * and store the current valid flag. (It may have
3706 * been changed by e2fsck since we originally mounted
3710 ext4_clear_journal_err(sb
, es
);
3711 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3712 if ((err
= ext4_group_extend(sb
, es
, n_blocks_count
)))
3714 if (!ext4_setup_super(sb
, es
, 0))
3715 sb
->s_flags
&= ~MS_RDONLY
;
3719 ext4_setup_system_zone(sb
);
3720 if (sbi
->s_journal
== NULL
)
3721 ext4_commit_super(sb
, 1);
3724 /* Release old quota file names */
3725 for (i
= 0; i
< MAXQUOTAS
; i
++)
3726 if (old_opts
.s_qf_names
[i
] &&
3727 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3728 kfree(old_opts
.s_qf_names
[i
]);
3733 dquot_resume(sb
, -1);
3735 ext4_msg(sb
, KERN_INFO
, "re-mounted. Opts: %s", orig_data
);
3740 sb
->s_flags
= old_sb_flags
;
3741 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
3742 sbi
->s_resuid
= old_opts
.s_resuid
;
3743 sbi
->s_resgid
= old_opts
.s_resgid
;
3744 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
3745 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
3746 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
3748 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
3749 for (i
= 0; i
< MAXQUOTAS
; i
++) {
3750 if (sbi
->s_qf_names
[i
] &&
3751 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3752 kfree(sbi
->s_qf_names
[i
]);
3753 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
3762 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
3764 struct super_block
*sb
= dentry
->d_sb
;
3765 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3766 struct ext4_super_block
*es
= sbi
->s_es
;
3769 if (test_opt(sb
, MINIX_DF
)) {
3770 sbi
->s_overhead_last
= 0;
3771 } else if (sbi
->s_blocks_last
!= ext4_blocks_count(es
)) {
3772 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3773 ext4_fsblk_t overhead
= 0;
3776 * Compute the overhead (FS structures). This is constant
3777 * for a given filesystem unless the number of block groups
3778 * changes so we cache the previous value until it does.
3782 * All of the blocks before first_data_block are
3785 overhead
= le32_to_cpu(es
->s_first_data_block
);
3788 * Add the overhead attributed to the superblock and
3789 * block group descriptors. If the sparse superblocks
3790 * feature is turned on, then not all groups have this.
3792 for (i
= 0; i
< ngroups
; i
++) {
3793 overhead
+= ext4_bg_has_super(sb
, i
) +
3794 ext4_bg_num_gdb(sb
, i
);
3799 * Every block group has an inode bitmap, a block
3800 * bitmap, and an inode table.
3802 overhead
+= ngroups
* (2 + sbi
->s_itb_per_group
);
3803 sbi
->s_overhead_last
= overhead
;
3805 sbi
->s_blocks_last
= ext4_blocks_count(es
);
3808 buf
->f_type
= EXT4_SUPER_MAGIC
;
3809 buf
->f_bsize
= sb
->s_blocksize
;
3810 buf
->f_blocks
= ext4_blocks_count(es
) - sbi
->s_overhead_last
;
3811 buf
->f_bfree
= percpu_counter_sum_positive(&sbi
->s_freeblocks_counter
) -
3812 percpu_counter_sum_positive(&sbi
->s_dirtyblocks_counter
);
3813 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
3814 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
3816 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
3817 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
3818 buf
->f_namelen
= EXT4_NAME_LEN
;
3819 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
3820 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
3821 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
3822 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
3827 /* Helper function for writing quotas on sync - we need to start transaction
3828 * before quota file is locked for write. Otherwise the are possible deadlocks:
3829 * Process 1 Process 2
3830 * ext4_create() quota_sync()
3831 * jbd2_journal_start() write_dquot()
3832 * dquot_initialize() down(dqio_mutex)
3833 * down(dqio_mutex) jbd2_journal_start()
3839 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
3841 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_type
];
3844 static int ext4_write_dquot(struct dquot
*dquot
)
3848 struct inode
*inode
;
3850 inode
= dquot_to_inode(dquot
);
3851 handle
= ext4_journal_start(inode
,
3852 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
3854 return PTR_ERR(handle
);
3855 ret
= dquot_commit(dquot
);
3856 err
= ext4_journal_stop(handle
);
3862 static int ext4_acquire_dquot(struct dquot
*dquot
)
3867 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3868 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
3870 return PTR_ERR(handle
);
3871 ret
= dquot_acquire(dquot
);
3872 err
= ext4_journal_stop(handle
);
3878 static int ext4_release_dquot(struct dquot
*dquot
)
3883 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3884 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
3885 if (IS_ERR(handle
)) {
3886 /* Release dquot anyway to avoid endless cycle in dqput() */
3887 dquot_release(dquot
);
3888 return PTR_ERR(handle
);
3890 ret
= dquot_release(dquot
);
3891 err
= ext4_journal_stop(handle
);
3897 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
3899 /* Are we journaling quotas? */
3900 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
3901 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
3902 dquot_mark_dquot_dirty(dquot
);
3903 return ext4_write_dquot(dquot
);
3905 return dquot_mark_dquot_dirty(dquot
);
3909 static int ext4_write_info(struct super_block
*sb
, int type
)
3914 /* Data block + inode block */
3915 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
3917 return PTR_ERR(handle
);
3918 ret
= dquot_commit_info(sb
, type
);
3919 err
= ext4_journal_stop(handle
);
3926 * Turn on quotas during mount time - we need to find
3927 * the quota file and such...
3929 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
3931 return dquot_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
3932 EXT4_SB(sb
)->s_jquota_fmt
, type
);
3936 * Standard function to be called on quota_on
3938 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
3944 if (!test_opt(sb
, QUOTA
))
3947 err
= kern_path(name
, LOOKUP_FOLLOW
, &path
);
3951 /* Quotafile not on the same filesystem? */
3952 if (path
.mnt
->mnt_sb
!= sb
) {
3956 /* Journaling quota? */
3957 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
3958 /* Quotafile not in fs root? */
3959 if (path
.dentry
->d_parent
!= sb
->s_root
)
3960 ext4_msg(sb
, KERN_WARNING
,
3961 "Quota file not on filesystem root. "
3962 "Journaled quota will not work");
3966 * When we journal data on quota file, we have to flush journal to see
3967 * all updates to the file when we bypass pagecache...
3969 if (EXT4_SB(sb
)->s_journal
&&
3970 ext4_should_journal_data(path
.dentry
->d_inode
)) {
3972 * We don't need to lock updates but journal_flush() could
3973 * otherwise be livelocked...
3975 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
3976 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
3977 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
3984 err
= dquot_quota_on_path(sb
, type
, format_id
, &path
);
3989 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3990 * acquiring the locks... As quota files are never truncated and quota code
3991 * itself serializes the operations (and noone else should touch the files)
3992 * we don't have to be afraid of races */
3993 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
3994 size_t len
, loff_t off
)
3996 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
3997 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
3999 int offset
= off
& (sb
->s_blocksize
- 1);
4002 struct buffer_head
*bh
;
4003 loff_t i_size
= i_size_read(inode
);
4007 if (off
+len
> i_size
)
4010 while (toread
> 0) {
4011 tocopy
= sb
->s_blocksize
- offset
< toread
?
4012 sb
->s_blocksize
- offset
: toread
;
4013 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
4016 if (!bh
) /* A hole? */
4017 memset(data
, 0, tocopy
);
4019 memcpy(data
, bh
->b_data
+offset
, tocopy
);
4029 /* Write to quotafile (we know the transaction is already started and has
4030 * enough credits) */
4031 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
4032 const char *data
, size_t len
, loff_t off
)
4034 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
4035 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
4037 int offset
= off
& (sb
->s_blocksize
- 1);
4038 int journal_quota
= EXT4_SB(sb
)->s_qf_names
[type
] != NULL
;
4039 struct buffer_head
*bh
;
4040 handle_t
*handle
= journal_current_handle();
4042 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
4043 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
4044 " cancelled because transaction is not started",
4045 (unsigned long long)off
, (unsigned long long)len
);
4049 * Since we account only one data block in transaction credits,
4050 * then it is impossible to cross a block boundary.
4052 if (sb
->s_blocksize
- offset
< len
) {
4053 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
4054 " cancelled because not block aligned",
4055 (unsigned long long)off
, (unsigned long long)len
);
4059 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
4060 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
4063 if (journal_quota
) {
4064 err
= ext4_journal_get_write_access(handle
, bh
);
4071 memcpy(bh
->b_data
+offset
, data
, len
);
4072 flush_dcache_page(bh
->b_page
);
4075 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
4077 /* Always do at least ordered writes for quotas */
4078 err
= ext4_jbd2_file_inode(handle
, inode
);
4079 mark_buffer_dirty(bh
);
4084 mutex_unlock(&inode
->i_mutex
);
4087 if (inode
->i_size
< off
+ len
) {
4088 i_size_write(inode
, off
+ len
);
4089 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
4091 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
4092 ext4_mark_inode_dirty(handle
, inode
);
4093 mutex_unlock(&inode
->i_mutex
);
4099 static int ext4_get_sb(struct file_system_type
*fs_type
, int flags
,
4100 const char *dev_name
, void *data
, struct vfsmount
*mnt
)
4102 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
,mnt
);
4105 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4106 static struct file_system_type ext2_fs_type
= {
4107 .owner
= THIS_MODULE
,
4109 .get_sb
= ext4_get_sb
,
4110 .kill_sb
= kill_block_super
,
4111 .fs_flags
= FS_REQUIRES_DEV
,
4114 static inline void register_as_ext2(void)
4116 int err
= register_filesystem(&ext2_fs_type
);
4119 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
4122 static inline void unregister_as_ext2(void)
4124 unregister_filesystem(&ext2_fs_type
);
4126 MODULE_ALIAS("ext2");
4128 static inline void register_as_ext2(void) { }
4129 static inline void unregister_as_ext2(void) { }
4132 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4133 static inline void register_as_ext3(void)
4135 int err
= register_filesystem(&ext3_fs_type
);
4138 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
4141 static inline void unregister_as_ext3(void)
4143 unregister_filesystem(&ext3_fs_type
);
4145 MODULE_ALIAS("ext3");
4147 static inline void register_as_ext3(void) { }
4148 static inline void unregister_as_ext3(void) { }
4151 static struct file_system_type ext4_fs_type
= {
4152 .owner
= THIS_MODULE
,
4154 .get_sb
= ext4_get_sb
,
4155 .kill_sb
= kill_block_super
,
4156 .fs_flags
= FS_REQUIRES_DEV
,
4159 static int __init
init_ext4_fs(void)
4163 ext4_check_flag_values();
4164 err
= init_ext4_system_zone();
4167 ext4_kset
= kset_create_and_add("ext4", NULL
, fs_kobj
);
4170 ext4_proc_root
= proc_mkdir("fs/ext4", NULL
);
4171 err
= init_ext4_mballoc();
4175 err
= init_ext4_xattr();
4178 err
= init_inodecache();
4183 err
= register_filesystem(&ext4_fs_type
);
4188 unregister_as_ext2();
4189 unregister_as_ext3();
4190 destroy_inodecache();
4194 exit_ext4_mballoc();
4196 remove_proc_entry("fs/ext4", NULL
);
4197 kset_unregister(ext4_kset
);
4199 exit_ext4_system_zone();
4203 static void __exit
exit_ext4_fs(void)
4205 unregister_as_ext2();
4206 unregister_as_ext3();
4207 unregister_filesystem(&ext4_fs_type
);
4208 destroy_inodecache();
4210 exit_ext4_mballoc();
4211 remove_proc_entry("fs/ext4", NULL
);
4212 kset_unregister(ext4_kset
);
4213 exit_ext4_system_zone();
4216 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4217 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4218 MODULE_LICENSE("GPL");
4219 module_init(init_ext4_fs
)
4220 module_exit(exit_ext4_fs
)