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
);
73 ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
74 struct ext4_group_desc
*bg
)
76 return le32_to_cpu(bg
->bg_block_bitmap_lo
) |
77 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
78 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
81 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
82 struct ext4_group_desc
*bg
)
84 return le32_to_cpu(bg
->bg_inode_bitmap_lo
) |
85 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
86 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
89 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
90 struct ext4_group_desc
*bg
)
92 return le32_to_cpu(bg
->bg_inode_table_lo
) |
93 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
94 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
97 __u32
ext4_free_blks_count(struct super_block
*sb
,
98 struct ext4_group_desc
*bg
)
100 return le16_to_cpu(bg
->bg_free_blocks_count_lo
) |
101 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
102 (__u32
)le16_to_cpu(bg
->bg_free_blocks_count_hi
) << 16 : 0);
105 __u32
ext4_free_inodes_count(struct super_block
*sb
,
106 struct ext4_group_desc
*bg
)
108 return le16_to_cpu(bg
->bg_free_inodes_count_lo
) |
109 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
110 (__u32
)le16_to_cpu(bg
->bg_free_inodes_count_hi
) << 16 : 0);
113 __u32
ext4_used_dirs_count(struct super_block
*sb
,
114 struct ext4_group_desc
*bg
)
116 return le16_to_cpu(bg
->bg_used_dirs_count_lo
) |
117 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
118 (__u32
)le16_to_cpu(bg
->bg_used_dirs_count_hi
) << 16 : 0);
121 __u32
ext4_itable_unused_count(struct super_block
*sb
,
122 struct ext4_group_desc
*bg
)
124 return le16_to_cpu(bg
->bg_itable_unused_lo
) |
125 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
126 (__u32
)le16_to_cpu(bg
->bg_itable_unused_hi
) << 16 : 0);
129 void ext4_block_bitmap_set(struct super_block
*sb
,
130 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
132 bg
->bg_block_bitmap_lo
= cpu_to_le32((u32
)blk
);
133 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
134 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
137 void ext4_inode_bitmap_set(struct super_block
*sb
,
138 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
140 bg
->bg_inode_bitmap_lo
= cpu_to_le32((u32
)blk
);
141 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
142 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
145 void ext4_inode_table_set(struct super_block
*sb
,
146 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
148 bg
->bg_inode_table_lo
= cpu_to_le32((u32
)blk
);
149 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
150 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
153 void ext4_free_blks_set(struct super_block
*sb
,
154 struct ext4_group_desc
*bg
, __u32 count
)
156 bg
->bg_free_blocks_count_lo
= cpu_to_le16((__u16
)count
);
157 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
158 bg
->bg_free_blocks_count_hi
= cpu_to_le16(count
>> 16);
161 void ext4_free_inodes_set(struct super_block
*sb
,
162 struct ext4_group_desc
*bg
, __u32 count
)
164 bg
->bg_free_inodes_count_lo
= cpu_to_le16((__u16
)count
);
165 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
166 bg
->bg_free_inodes_count_hi
= cpu_to_le16(count
>> 16);
169 void ext4_used_dirs_set(struct super_block
*sb
,
170 struct ext4_group_desc
*bg
, __u32 count
)
172 bg
->bg_used_dirs_count_lo
= cpu_to_le16((__u16
)count
);
173 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
174 bg
->bg_used_dirs_count_hi
= cpu_to_le16(count
>> 16);
177 void ext4_itable_unused_set(struct super_block
*sb
,
178 struct ext4_group_desc
*bg
, __u32 count
)
180 bg
->bg_itable_unused_lo
= cpu_to_le16((__u16
)count
);
181 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
182 bg
->bg_itable_unused_hi
= cpu_to_le16(count
>> 16);
186 /* Just increment the non-pointer handle value */
187 static handle_t
*ext4_get_nojournal(void)
189 handle_t
*handle
= current
->journal_info
;
190 unsigned long ref_cnt
= (unsigned long)handle
;
192 BUG_ON(ref_cnt
>= EXT4_NOJOURNAL_MAX_REF_COUNT
);
195 handle
= (handle_t
*)ref_cnt
;
197 current
->journal_info
= handle
;
202 /* Decrement the non-pointer handle value */
203 static void ext4_put_nojournal(handle_t
*handle
)
205 unsigned long ref_cnt
= (unsigned long)handle
;
207 BUG_ON(ref_cnt
== 0);
210 handle
= (handle_t
*)ref_cnt
;
212 current
->journal_info
= handle
;
216 * Wrappers for jbd2_journal_start/end.
218 * The only special thing we need to do here is to make sure that all
219 * journal_end calls result in the superblock being marked dirty, so
220 * that sync() will call the filesystem's write_super callback if
223 handle_t
*ext4_journal_start_sb(struct super_block
*sb
, int nblocks
)
227 if (sb
->s_flags
& MS_RDONLY
)
228 return ERR_PTR(-EROFS
);
230 /* Special case here: if the journal has aborted behind our
231 * backs (eg. EIO in the commit thread), then we still need to
232 * take the FS itself readonly cleanly. */
233 journal
= EXT4_SB(sb
)->s_journal
;
235 if (is_journal_aborted(journal
)) {
236 ext4_abort(sb
, __func__
, "Detected aborted journal");
237 return ERR_PTR(-EROFS
);
239 return jbd2_journal_start(journal
, nblocks
);
241 return ext4_get_nojournal();
245 * The only special thing we need to do here is to make sure that all
246 * jbd2_journal_stop calls result in the superblock being marked dirty, so
247 * that sync() will call the filesystem's write_super callback if
250 int __ext4_journal_stop(const char *where
, handle_t
*handle
)
252 struct super_block
*sb
;
256 if (!ext4_handle_valid(handle
)) {
257 ext4_put_nojournal(handle
);
260 sb
= handle
->h_transaction
->t_journal
->j_private
;
262 rc
= jbd2_journal_stop(handle
);
267 __ext4_std_error(sb
, where
, err
);
271 void ext4_journal_abort_handle(const char *caller
, const char *err_fn
,
272 struct buffer_head
*bh
, handle_t
*handle
, int err
)
275 const char *errstr
= ext4_decode_error(NULL
, err
, nbuf
);
277 BUG_ON(!ext4_handle_valid(handle
));
280 BUFFER_TRACE(bh
, "abort");
285 if (is_handle_aborted(handle
))
288 printk(KERN_ERR
"%s: aborting transaction: %s in %s\n",
289 caller
, errstr
, err_fn
);
291 jbd2_journal_abort_handle(handle
);
294 /* Deal with the reporting of failure conditions on a filesystem such as
295 * inconsistencies detected or read IO failures.
297 * On ext2, we can store the error state of the filesystem in the
298 * superblock. That is not possible on ext4, because we may have other
299 * write ordering constraints on the superblock which prevent us from
300 * writing it out straight away; and given that the journal is about to
301 * be aborted, we can't rely on the current, or future, transactions to
302 * write out the superblock safely.
304 * We'll just use the jbd2_journal_abort() error code to record an error in
305 * the journal instead. On recovery, the journal will compain about
306 * that error until we've noted it down and cleared it.
309 static void ext4_handle_error(struct super_block
*sb
)
311 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
313 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
314 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
316 if (sb
->s_flags
& MS_RDONLY
)
319 if (!test_opt(sb
, ERRORS_CONT
)) {
320 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
322 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
324 jbd2_journal_abort(journal
, -EIO
);
326 if (test_opt(sb
, ERRORS_RO
)) {
327 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
328 sb
->s_flags
|= MS_RDONLY
;
330 ext4_commit_super(sb
, 1);
331 if (test_opt(sb
, ERRORS_PANIC
))
332 panic("EXT4-fs (device %s): panic forced after error\n",
336 void __ext4_error(struct super_block
*sb
, const char *function
,
337 const char *fmt
, ...)
342 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
347 ext4_handle_error(sb
);
350 void ext4_error_inode(const char *function
, struct inode
*inode
,
351 const char *fmt
, ...)
356 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: inode #%lu: (comm %s) ",
357 inode
->i_sb
->s_id
, function
, inode
->i_ino
, current
->comm
);
362 ext4_handle_error(inode
->i_sb
);
365 void ext4_error_file(const char *function
, struct file
*file
,
366 const char *fmt
, ...)
369 struct inode
*inode
= file
->f_dentry
->d_inode
;
370 char pathname
[80], *path
;
373 path
= d_path(&(file
->f_path
), pathname
, sizeof(pathname
));
377 "EXT4-fs error (device %s): %s: inode #%lu (comm %s path %s): ",
378 inode
->i_sb
->s_id
, function
, inode
->i_ino
, current
->comm
, path
);
383 ext4_handle_error(inode
->i_sb
);
386 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
393 errstr
= "IO failure";
396 errstr
= "Out of memory";
399 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
400 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
401 errstr
= "Journal has aborted";
403 errstr
= "Readonly filesystem";
406 /* If the caller passed in an extra buffer for unknown
407 * errors, textualise them now. Else we just return
410 /* Check for truncated error codes... */
411 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
420 /* __ext4_std_error decodes expected errors from journaling functions
421 * automatically and invokes the appropriate error response. */
423 void __ext4_std_error(struct super_block
*sb
, const char *function
, int errno
)
428 /* Special case: if the error is EROFS, and we're not already
429 * inside a transaction, then there's really no point in logging
431 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
432 (sb
->s_flags
& MS_RDONLY
))
435 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
436 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s: %s\n",
437 sb
->s_id
, function
, errstr
);
439 ext4_handle_error(sb
);
443 * ext4_abort is a much stronger failure handler than ext4_error. The
444 * abort function may be used to deal with unrecoverable failures such
445 * as journal IO errors or ENOMEM at a critical moment in log management.
447 * We unconditionally force the filesystem into an ABORT|READONLY state,
448 * unless the error response on the fs has been set to panic in which
449 * case we take the easy way out and panic immediately.
452 void ext4_abort(struct super_block
*sb
, const char *function
,
453 const char *fmt
, ...)
458 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
463 if (test_opt(sb
, ERRORS_PANIC
))
464 panic("EXT4-fs panic from previous error\n");
466 if (sb
->s_flags
& MS_RDONLY
)
469 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
470 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
471 sb
->s_flags
|= MS_RDONLY
;
472 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
473 if (EXT4_SB(sb
)->s_journal
)
474 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
477 void ext4_msg (struct super_block
* sb
, const char *prefix
,
478 const char *fmt
, ...)
483 printk("%sEXT4-fs (%s): ", prefix
, sb
->s_id
);
489 void __ext4_warning(struct super_block
*sb
, const char *function
,
490 const char *fmt
, ...)
495 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s: ",
502 void ext4_grp_locked_error(struct super_block
*sb
, ext4_group_t grp
,
503 const char *function
, const char *fmt
, ...)
508 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
511 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
516 if (test_opt(sb
, ERRORS_CONT
)) {
517 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
518 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
519 ext4_commit_super(sb
, 0);
522 ext4_unlock_group(sb
, grp
);
523 ext4_handle_error(sb
);
525 * We only get here in the ERRORS_RO case; relocking the group
526 * may be dangerous, but nothing bad will happen since the
527 * filesystem will have already been marked read/only and the
528 * journal has been aborted. We return 1 as a hint to callers
529 * who might what to use the return value from
530 * ext4_grp_locked_error() to distinguish beween the
531 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
532 * aggressively from the ext4 function in question, with a
533 * more appropriate error code.
535 ext4_lock_group(sb
, grp
);
539 void ext4_update_dynamic_rev(struct super_block
*sb
)
541 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
543 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
547 "updating to rev %d because of new feature flag, "
548 "running e2fsck is recommended",
551 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
552 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
553 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
554 /* leave es->s_feature_*compat flags alone */
555 /* es->s_uuid will be set by e2fsck if empty */
558 * The rest of the superblock fields should be zero, and if not it
559 * means they are likely already in use, so leave them alone. We
560 * can leave it up to e2fsck to clean up any inconsistencies there.
565 * Open the external journal device
567 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
569 struct block_device
*bdev
;
570 char b
[BDEVNAME_SIZE
];
572 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
578 ext4_msg(sb
, KERN_ERR
, "failed to open journal device %s: %ld",
579 __bdevname(dev
, b
), PTR_ERR(bdev
));
584 * Release the journal device
586 static int ext4_blkdev_put(struct block_device
*bdev
)
589 return blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
592 static int ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
594 struct block_device
*bdev
;
597 bdev
= sbi
->journal_bdev
;
599 ret
= ext4_blkdev_put(bdev
);
600 sbi
->journal_bdev
= NULL
;
605 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
607 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
610 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
614 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
615 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
617 printk(KERN_ERR
"sb_info orphan list:\n");
618 list_for_each(l
, &sbi
->s_orphan
) {
619 struct inode
*inode
= orphan_list_entry(l
);
621 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
622 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
623 inode
->i_mode
, inode
->i_nlink
,
628 static void ext4_put_super(struct super_block
*sb
)
630 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
631 struct ext4_super_block
*es
= sbi
->s_es
;
634 flush_workqueue(sbi
->dio_unwritten_wq
);
635 destroy_workqueue(sbi
->dio_unwritten_wq
);
640 ext4_commit_super(sb
, 1);
642 if (sbi
->s_journal
) {
643 err
= jbd2_journal_destroy(sbi
->s_journal
);
644 sbi
->s_journal
= NULL
;
646 ext4_abort(sb
, __func__
,
647 "Couldn't clean up the journal");
650 ext4_release_system_zone(sb
);
652 ext4_ext_release(sb
);
653 ext4_xattr_put_super(sb
);
655 if (!(sb
->s_flags
& MS_RDONLY
)) {
656 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
657 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
658 ext4_commit_super(sb
, 1);
661 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
663 kobject_del(&sbi
->s_kobj
);
665 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
666 brelse(sbi
->s_group_desc
[i
]);
667 kfree(sbi
->s_group_desc
);
668 if (is_vmalloc_addr(sbi
->s_flex_groups
))
669 vfree(sbi
->s_flex_groups
);
671 kfree(sbi
->s_flex_groups
);
672 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
673 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
674 percpu_counter_destroy(&sbi
->s_dirs_counter
);
675 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
678 for (i
= 0; i
< MAXQUOTAS
; i
++)
679 kfree(sbi
->s_qf_names
[i
]);
682 /* Debugging code just in case the in-memory inode orphan list
683 * isn't empty. The on-disk one can be non-empty if we've
684 * detected an error and taken the fs readonly, but the
685 * in-memory list had better be clean by this point. */
686 if (!list_empty(&sbi
->s_orphan
))
687 dump_orphan_list(sb
, sbi
);
688 J_ASSERT(list_empty(&sbi
->s_orphan
));
690 invalidate_bdev(sb
->s_bdev
);
691 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
693 * Invalidate the journal device's buffers. We don't want them
694 * floating about in memory - the physical journal device may
695 * hotswapped, and it breaks the `ro-after' testing code.
697 sync_blockdev(sbi
->journal_bdev
);
698 invalidate_bdev(sbi
->journal_bdev
);
699 ext4_blkdev_remove(sbi
);
701 sb
->s_fs_info
= NULL
;
703 * Now that we are completely done shutting down the
704 * superblock, we need to actually destroy the kobject.
708 kobject_put(&sbi
->s_kobj
);
709 wait_for_completion(&sbi
->s_kobj_unregister
);
710 kfree(sbi
->s_blockgroup_lock
);
714 static struct kmem_cache
*ext4_inode_cachep
;
717 * Called inside transaction, so use GFP_NOFS
719 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
721 struct ext4_inode_info
*ei
;
723 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
727 ei
->vfs_inode
.i_version
= 1;
728 ei
->vfs_inode
.i_data
.writeback_index
= 0;
729 memset(&ei
->i_cached_extent
, 0, sizeof(struct ext4_ext_cache
));
730 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
731 spin_lock_init(&ei
->i_prealloc_lock
);
733 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
734 * therefore it can be null here. Don't check it, just initialize
737 jbd2_journal_init_jbd_inode(&ei
->jinode
, &ei
->vfs_inode
);
738 ei
->i_reserved_data_blocks
= 0;
739 ei
->i_reserved_meta_blocks
= 0;
740 ei
->i_allocated_meta_blocks
= 0;
741 ei
->i_da_metadata_calc_len
= 0;
742 ei
->i_delalloc_reserved_flag
= 0;
743 spin_lock_init(&(ei
->i_block_reservation_lock
));
745 ei
->i_reserved_quota
= 0;
747 INIT_LIST_HEAD(&ei
->i_completed_io_list
);
748 spin_lock_init(&ei
->i_completed_io_lock
);
749 ei
->cur_aio_dio
= NULL
;
751 ei
->i_datasync_tid
= 0;
753 return &ei
->vfs_inode
;
756 static void ext4_destroy_inode(struct inode
*inode
)
758 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
759 ext4_msg(inode
->i_sb
, KERN_ERR
,
760 "Inode %lu (%p): orphan list check failed!",
761 inode
->i_ino
, EXT4_I(inode
));
762 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
763 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
767 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
770 static void init_once(void *foo
)
772 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
774 INIT_LIST_HEAD(&ei
->i_orphan
);
775 #ifdef CONFIG_EXT4_FS_XATTR
776 init_rwsem(&ei
->xattr_sem
);
778 init_rwsem(&ei
->i_data_sem
);
779 inode_init_once(&ei
->vfs_inode
);
782 static int init_inodecache(void)
784 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
785 sizeof(struct ext4_inode_info
),
786 0, (SLAB_RECLAIM_ACCOUNT
|
789 if (ext4_inode_cachep
== NULL
)
794 static void destroy_inodecache(void)
796 kmem_cache_destroy(ext4_inode_cachep
);
799 static void ext4_clear_inode(struct inode
*inode
)
801 ext4_discard_preallocations(inode
);
802 if (EXT4_JOURNAL(inode
))
803 jbd2_journal_release_jbd_inode(EXT4_SB(inode
->i_sb
)->s_journal
,
804 &EXT4_I(inode
)->jinode
);
807 static inline void ext4_show_quota_options(struct seq_file
*seq
,
808 struct super_block
*sb
)
810 #if defined(CONFIG_QUOTA)
811 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
813 if (sbi
->s_jquota_fmt
) {
816 switch (sbi
->s_jquota_fmt
) {
827 seq_printf(seq
, ",jqfmt=%s", fmtname
);
830 if (sbi
->s_qf_names
[USRQUOTA
])
831 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
833 if (sbi
->s_qf_names
[GRPQUOTA
])
834 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
836 if (test_opt(sb
, USRQUOTA
))
837 seq_puts(seq
, ",usrquota");
839 if (test_opt(sb
, GRPQUOTA
))
840 seq_puts(seq
, ",grpquota");
846 * - it's set to a non-default value OR
847 * - if the per-sb default is different from the global default
849 static int ext4_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
852 unsigned long def_mount_opts
;
853 struct super_block
*sb
= vfs
->mnt_sb
;
854 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
855 struct ext4_super_block
*es
= sbi
->s_es
;
857 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
858 def_errors
= le16_to_cpu(es
->s_errors
);
860 if (sbi
->s_sb_block
!= 1)
861 seq_printf(seq
, ",sb=%llu", sbi
->s_sb_block
);
862 if (test_opt(sb
, MINIX_DF
))
863 seq_puts(seq
, ",minixdf");
864 if (test_opt(sb
, GRPID
) && !(def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
865 seq_puts(seq
, ",grpid");
866 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
867 seq_puts(seq
, ",nogrpid");
868 if (sbi
->s_resuid
!= EXT4_DEF_RESUID
||
869 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
) {
870 seq_printf(seq
, ",resuid=%u", sbi
->s_resuid
);
872 if (sbi
->s_resgid
!= EXT4_DEF_RESGID
||
873 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
) {
874 seq_printf(seq
, ",resgid=%u", sbi
->s_resgid
);
876 if (test_opt(sb
, ERRORS_RO
)) {
877 if (def_errors
== EXT4_ERRORS_PANIC
||
878 def_errors
== EXT4_ERRORS_CONTINUE
) {
879 seq_puts(seq
, ",errors=remount-ro");
882 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
883 seq_puts(seq
, ",errors=continue");
884 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
885 seq_puts(seq
, ",errors=panic");
886 if (test_opt(sb
, NO_UID32
) && !(def_mount_opts
& EXT4_DEFM_UID16
))
887 seq_puts(seq
, ",nouid32");
888 if (test_opt(sb
, DEBUG
) && !(def_mount_opts
& EXT4_DEFM_DEBUG
))
889 seq_puts(seq
, ",debug");
890 if (test_opt(sb
, OLDALLOC
))
891 seq_puts(seq
, ",oldalloc");
892 #ifdef CONFIG_EXT4_FS_XATTR
893 if (test_opt(sb
, XATTR_USER
) &&
894 !(def_mount_opts
& EXT4_DEFM_XATTR_USER
))
895 seq_puts(seq
, ",user_xattr");
896 if (!test_opt(sb
, XATTR_USER
) &&
897 (def_mount_opts
& EXT4_DEFM_XATTR_USER
)) {
898 seq_puts(seq
, ",nouser_xattr");
901 #ifdef CONFIG_EXT4_FS_POSIX_ACL
902 if (test_opt(sb
, POSIX_ACL
) && !(def_mount_opts
& EXT4_DEFM_ACL
))
903 seq_puts(seq
, ",acl");
904 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT4_DEFM_ACL
))
905 seq_puts(seq
, ",noacl");
907 if (sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
) {
908 seq_printf(seq
, ",commit=%u",
909 (unsigned) (sbi
->s_commit_interval
/ HZ
));
911 if (sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
) {
912 seq_printf(seq
, ",min_batch_time=%u",
913 (unsigned) sbi
->s_min_batch_time
);
915 if (sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
) {
916 seq_printf(seq
, ",max_batch_time=%u",
917 (unsigned) sbi
->s_min_batch_time
);
921 * We're changing the default of barrier mount option, so
922 * let's always display its mount state so it's clear what its
925 seq_puts(seq
, ",barrier=");
926 seq_puts(seq
, test_opt(sb
, BARRIER
) ? "1" : "0");
927 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
))
928 seq_puts(seq
, ",journal_async_commit");
929 if (test_opt(sb
, NOBH
))
930 seq_puts(seq
, ",nobh");
931 if (test_opt(sb
, I_VERSION
))
932 seq_puts(seq
, ",i_version");
933 if (!test_opt(sb
, DELALLOC
))
934 seq_puts(seq
, ",nodelalloc");
938 seq_printf(seq
, ",stripe=%lu", sbi
->s_stripe
);
940 * journal mode get enabled in different ways
941 * So just print the value even if we didn't specify it
943 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
944 seq_puts(seq
, ",data=journal");
945 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
946 seq_puts(seq
, ",data=ordered");
947 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
948 seq_puts(seq
, ",data=writeback");
950 if (sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
951 seq_printf(seq
, ",inode_readahead_blks=%u",
952 sbi
->s_inode_readahead_blks
);
954 if (test_opt(sb
, DATA_ERR_ABORT
))
955 seq_puts(seq
, ",data_err=abort");
957 if (test_opt(sb
, NO_AUTO_DA_ALLOC
))
958 seq_puts(seq
, ",noauto_da_alloc");
960 if (test_opt(sb
, DISCARD
))
961 seq_puts(seq
, ",discard");
963 if (test_opt(sb
, NOLOAD
))
964 seq_puts(seq
, ",norecovery");
966 if (test_opt(sb
, DIOREAD_NOLOCK
))
967 seq_puts(seq
, ",dioread_nolock");
969 ext4_show_quota_options(seq
, sb
);
974 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
975 u64 ino
, u32 generation
)
979 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
980 return ERR_PTR(-ESTALE
);
981 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
982 return ERR_PTR(-ESTALE
);
984 /* iget isn't really right if the inode is currently unallocated!!
986 * ext4_read_inode will return a bad_inode if the inode had been
987 * deleted, so we should be safe.
989 * Currently we don't know the generation for parent directory, so
990 * a generation of 0 means "accept any"
992 inode
= ext4_iget(sb
, ino
);
994 return ERR_CAST(inode
);
995 if (generation
&& inode
->i_generation
!= generation
) {
997 return ERR_PTR(-ESTALE
);
1003 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
1004 int fh_len
, int fh_type
)
1006 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
1007 ext4_nfs_get_inode
);
1010 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
1011 int fh_len
, int fh_type
)
1013 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
1014 ext4_nfs_get_inode
);
1018 * Try to release metadata pages (indirect blocks, directories) which are
1019 * mapped via the block device. Since these pages could have journal heads
1020 * which would prevent try_to_free_buffers() from freeing them, we must use
1021 * jbd2 layer's try_to_free_buffers() function to release them.
1023 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
1026 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
1028 WARN_ON(PageChecked(page
));
1029 if (!page_has_buffers(page
))
1032 return jbd2_journal_try_to_free_buffers(journal
, page
,
1033 wait
& ~__GFP_WAIT
);
1034 return try_to_free_buffers(page
);
1038 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1039 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1041 static int ext4_write_dquot(struct dquot
*dquot
);
1042 static int ext4_acquire_dquot(struct dquot
*dquot
);
1043 static int ext4_release_dquot(struct dquot
*dquot
);
1044 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1045 static int ext4_write_info(struct super_block
*sb
, int type
);
1046 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1047 char *path
, int remount
);
1048 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1049 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1050 size_t len
, loff_t off
);
1051 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1052 const char *data
, size_t len
, loff_t off
);
1054 static const struct dquot_operations ext4_quota_operations
= {
1055 .initialize
= dquot_initialize
,
1057 .alloc_space
= dquot_alloc_space
,
1058 .reserve_space
= dquot_reserve_space
,
1059 .claim_space
= dquot_claim_space
,
1060 .release_rsv
= dquot_release_reserved_space
,
1062 .get_reserved_space
= ext4_get_reserved_space
,
1064 .alloc_inode
= dquot_alloc_inode
,
1065 .free_space
= dquot_free_space
,
1066 .free_inode
= dquot_free_inode
,
1067 .transfer
= dquot_transfer
,
1068 .write_dquot
= ext4_write_dquot
,
1069 .acquire_dquot
= ext4_acquire_dquot
,
1070 .release_dquot
= ext4_release_dquot
,
1071 .mark_dirty
= ext4_mark_dquot_dirty
,
1072 .write_info
= ext4_write_info
,
1073 .alloc_dquot
= dquot_alloc
,
1074 .destroy_dquot
= dquot_destroy
,
1077 static const struct quotactl_ops ext4_qctl_operations
= {
1078 .quota_on
= ext4_quota_on
,
1079 .quota_off
= vfs_quota_off
,
1080 .quota_sync
= vfs_quota_sync
,
1081 .get_info
= vfs_get_dqinfo
,
1082 .set_info
= vfs_set_dqinfo
,
1083 .get_dqblk
= vfs_get_dqblk
,
1084 .set_dqblk
= vfs_set_dqblk
1088 static const struct super_operations ext4_sops
= {
1089 .alloc_inode
= ext4_alloc_inode
,
1090 .destroy_inode
= ext4_destroy_inode
,
1091 .write_inode
= ext4_write_inode
,
1092 .dirty_inode
= ext4_dirty_inode
,
1093 .delete_inode
= ext4_delete_inode
,
1094 .put_super
= ext4_put_super
,
1095 .sync_fs
= ext4_sync_fs
,
1096 .freeze_fs
= ext4_freeze
,
1097 .unfreeze_fs
= ext4_unfreeze
,
1098 .statfs
= ext4_statfs
,
1099 .remount_fs
= ext4_remount
,
1100 .clear_inode
= ext4_clear_inode
,
1101 .show_options
= ext4_show_options
,
1103 .quota_read
= ext4_quota_read
,
1104 .quota_write
= ext4_quota_write
,
1106 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1109 static const struct super_operations ext4_nojournal_sops
= {
1110 .alloc_inode
= ext4_alloc_inode
,
1111 .destroy_inode
= ext4_destroy_inode
,
1112 .write_inode
= ext4_write_inode
,
1113 .dirty_inode
= ext4_dirty_inode
,
1114 .delete_inode
= ext4_delete_inode
,
1115 .write_super
= ext4_write_super
,
1116 .put_super
= ext4_put_super
,
1117 .statfs
= ext4_statfs
,
1118 .remount_fs
= ext4_remount
,
1119 .clear_inode
= ext4_clear_inode
,
1120 .show_options
= ext4_show_options
,
1122 .quota_read
= ext4_quota_read
,
1123 .quota_write
= ext4_quota_write
,
1125 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1128 static const struct export_operations ext4_export_ops
= {
1129 .fh_to_dentry
= ext4_fh_to_dentry
,
1130 .fh_to_parent
= ext4_fh_to_parent
,
1131 .get_parent
= ext4_get_parent
,
1135 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1136 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1137 Opt_nouid32
, Opt_debug
, Opt_oldalloc
, Opt_orlov
,
1138 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1139 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
, Opt_nobh
, Opt_bh
,
1140 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
,
1141 Opt_journal_update
, Opt_journal_dev
,
1142 Opt_journal_checksum
, Opt_journal_async_commit
,
1143 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1144 Opt_data_err_abort
, Opt_data_err_ignore
,
1145 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1146 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1147 Opt_noquota
, Opt_ignore
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1148 Opt_resize
, Opt_usrquota
, Opt_grpquota
, Opt_i_version
,
1149 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
,
1150 Opt_block_validity
, Opt_noblock_validity
,
1151 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1152 Opt_dioread_nolock
, Opt_dioread_lock
,
1153 Opt_discard
, Opt_nodiscard
,
1156 static const match_table_t tokens
= {
1157 {Opt_bsd_df
, "bsddf"},
1158 {Opt_minix_df
, "minixdf"},
1159 {Opt_grpid
, "grpid"},
1160 {Opt_grpid
, "bsdgroups"},
1161 {Opt_nogrpid
, "nogrpid"},
1162 {Opt_nogrpid
, "sysvgroups"},
1163 {Opt_resgid
, "resgid=%u"},
1164 {Opt_resuid
, "resuid=%u"},
1166 {Opt_err_cont
, "errors=continue"},
1167 {Opt_err_panic
, "errors=panic"},
1168 {Opt_err_ro
, "errors=remount-ro"},
1169 {Opt_nouid32
, "nouid32"},
1170 {Opt_debug
, "debug"},
1171 {Opt_oldalloc
, "oldalloc"},
1172 {Opt_orlov
, "orlov"},
1173 {Opt_user_xattr
, "user_xattr"},
1174 {Opt_nouser_xattr
, "nouser_xattr"},
1176 {Opt_noacl
, "noacl"},
1177 {Opt_noload
, "noload"},
1178 {Opt_noload
, "norecovery"},
1181 {Opt_commit
, "commit=%u"},
1182 {Opt_min_batch_time
, "min_batch_time=%u"},
1183 {Opt_max_batch_time
, "max_batch_time=%u"},
1184 {Opt_journal_update
, "journal=update"},
1185 {Opt_journal_dev
, "journal_dev=%u"},
1186 {Opt_journal_checksum
, "journal_checksum"},
1187 {Opt_journal_async_commit
, "journal_async_commit"},
1188 {Opt_abort
, "abort"},
1189 {Opt_data_journal
, "data=journal"},
1190 {Opt_data_ordered
, "data=ordered"},
1191 {Opt_data_writeback
, "data=writeback"},
1192 {Opt_data_err_abort
, "data_err=abort"},
1193 {Opt_data_err_ignore
, "data_err=ignore"},
1194 {Opt_offusrjquota
, "usrjquota="},
1195 {Opt_usrjquota
, "usrjquota=%s"},
1196 {Opt_offgrpjquota
, "grpjquota="},
1197 {Opt_grpjquota
, "grpjquota=%s"},
1198 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1199 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1200 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1201 {Opt_grpquota
, "grpquota"},
1202 {Opt_noquota
, "noquota"},
1203 {Opt_quota
, "quota"},
1204 {Opt_usrquota
, "usrquota"},
1205 {Opt_barrier
, "barrier=%u"},
1206 {Opt_barrier
, "barrier"},
1207 {Opt_nobarrier
, "nobarrier"},
1208 {Opt_i_version
, "i_version"},
1209 {Opt_stripe
, "stripe=%u"},
1210 {Opt_resize
, "resize"},
1211 {Opt_delalloc
, "delalloc"},
1212 {Opt_nodelalloc
, "nodelalloc"},
1213 {Opt_block_validity
, "block_validity"},
1214 {Opt_noblock_validity
, "noblock_validity"},
1215 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1216 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1217 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1218 {Opt_auto_da_alloc
, "auto_da_alloc"},
1219 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1220 {Opt_dioread_nolock
, "dioread_nolock"},
1221 {Opt_dioread_lock
, "dioread_lock"},
1222 {Opt_discard
, "discard"},
1223 {Opt_nodiscard
, "nodiscard"},
1227 static ext4_fsblk_t
get_sb_block(void **data
)
1229 ext4_fsblk_t sb_block
;
1230 char *options
= (char *) *data
;
1232 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1233 return 1; /* Default location */
1236 /* TODO: use simple_strtoll with >32bit ext4 */
1237 sb_block
= simple_strtoul(options
, &options
, 0);
1238 if (*options
&& *options
!= ',') {
1239 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1243 if (*options
== ',')
1245 *data
= (void *) options
;
1250 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1251 static char deprecated_msg
[] = "Mount option \"%s\" will be removed by %s\n"
1252 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1255 static int set_qf_name(struct super_block
*sb
, int qtype
, substring_t
*args
)
1257 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1260 if (sb_any_quota_loaded(sb
) &&
1261 !sbi
->s_qf_names
[qtype
]) {
1262 ext4_msg(sb
, KERN_ERR
,
1263 "Cannot change journaled "
1264 "quota options when quota turned on");
1267 qname
= match_strdup(args
);
1269 ext4_msg(sb
, KERN_ERR
,
1270 "Not enough memory for storing quotafile name");
1273 if (sbi
->s_qf_names
[qtype
] &&
1274 strcmp(sbi
->s_qf_names
[qtype
], qname
)) {
1275 ext4_msg(sb
, KERN_ERR
,
1276 "%s quota file already specified", QTYPE2NAME(qtype
));
1280 sbi
->s_qf_names
[qtype
] = qname
;
1281 if (strchr(sbi
->s_qf_names
[qtype
], '/')) {
1282 ext4_msg(sb
, KERN_ERR
,
1283 "quotafile must be on filesystem root");
1284 kfree(sbi
->s_qf_names
[qtype
]);
1285 sbi
->s_qf_names
[qtype
] = NULL
;
1288 set_opt(sbi
->s_mount_opt
, QUOTA
);
1292 static int clear_qf_name(struct super_block
*sb
, int qtype
)
1295 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1297 if (sb_any_quota_loaded(sb
) &&
1298 sbi
->s_qf_names
[qtype
]) {
1299 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled quota options"
1300 " when quota turned on");
1304 * The space will be released later when all options are confirmed
1307 sbi
->s_qf_names
[qtype
] = NULL
;
1312 static int parse_options(char *options
, struct super_block
*sb
,
1313 unsigned long *journal_devnum
,
1314 unsigned int *journal_ioprio
,
1315 ext4_fsblk_t
*n_blocks_count
, int is_remount
)
1317 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1319 substring_t args
[MAX_OPT_ARGS
];
1329 while ((p
= strsep(&options
, ",")) != NULL
) {
1335 * Initialize args struct so we know whether arg was
1336 * found; some options take optional arguments.
1338 args
[0].to
= args
[0].from
= 0;
1339 token
= match_token(p
, tokens
, args
);
1342 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1343 clear_opt(sbi
->s_mount_opt
, MINIX_DF
);
1346 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1347 set_opt(sbi
->s_mount_opt
, MINIX_DF
);
1351 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1352 set_opt(sbi
->s_mount_opt
, GRPID
);
1356 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1357 clear_opt(sbi
->s_mount_opt
, GRPID
);
1361 if (match_int(&args
[0], &option
))
1363 sbi
->s_resuid
= option
;
1366 if (match_int(&args
[0], &option
))
1368 sbi
->s_resgid
= option
;
1371 /* handled by get_sb_block() instead of here */
1372 /* *sb_block = match_int(&args[0]); */
1375 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1376 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1377 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1380 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1381 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1382 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1385 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1386 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1387 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1390 set_opt(sbi
->s_mount_opt
, NO_UID32
);
1393 set_opt(sbi
->s_mount_opt
, DEBUG
);
1396 set_opt(sbi
->s_mount_opt
, OLDALLOC
);
1399 clear_opt(sbi
->s_mount_opt
, OLDALLOC
);
1401 #ifdef CONFIG_EXT4_FS_XATTR
1402 case Opt_user_xattr
:
1403 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
1405 case Opt_nouser_xattr
:
1406 clear_opt(sbi
->s_mount_opt
, XATTR_USER
);
1409 case Opt_user_xattr
:
1410 case Opt_nouser_xattr
:
1411 ext4_msg(sb
, KERN_ERR
, "(no)user_xattr options not supported");
1414 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1416 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1419 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1424 ext4_msg(sb
, KERN_ERR
, "(no)acl options not supported");
1427 case Opt_journal_update
:
1429 /* Eventually we will want to be able to create
1430 a journal file here. For now, only allow the
1431 user to specify an existing inode to be the
1434 ext4_msg(sb
, KERN_ERR
,
1435 "Cannot specify journal on remount");
1438 set_opt(sbi
->s_mount_opt
, UPDATE_JOURNAL
);
1440 case Opt_journal_dev
:
1442 ext4_msg(sb
, KERN_ERR
,
1443 "Cannot specify journal on remount");
1446 if (match_int(&args
[0], &option
))
1448 *journal_devnum
= option
;
1450 case Opt_journal_checksum
:
1451 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1453 case Opt_journal_async_commit
:
1454 set_opt(sbi
->s_mount_opt
, JOURNAL_ASYNC_COMMIT
);
1455 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1458 set_opt(sbi
->s_mount_opt
, NOLOAD
);
1461 if (match_int(&args
[0], &option
))
1466 option
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1467 sbi
->s_commit_interval
= HZ
* option
;
1469 case Opt_max_batch_time
:
1470 if (match_int(&args
[0], &option
))
1475 option
= EXT4_DEF_MAX_BATCH_TIME
;
1476 sbi
->s_max_batch_time
= option
;
1478 case Opt_min_batch_time
:
1479 if (match_int(&args
[0], &option
))
1483 sbi
->s_min_batch_time
= option
;
1485 case Opt_data_journal
:
1486 data_opt
= EXT4_MOUNT_JOURNAL_DATA
;
1488 case Opt_data_ordered
:
1489 data_opt
= EXT4_MOUNT_ORDERED_DATA
;
1491 case Opt_data_writeback
:
1492 data_opt
= EXT4_MOUNT_WRITEBACK_DATA
;
1495 if (test_opt(sb
, DATA_FLAGS
) != data_opt
) {
1496 ext4_msg(sb
, KERN_ERR
,
1497 "Cannot change data mode on remount");
1501 clear_opt(sbi
->s_mount_opt
, DATA_FLAGS
);
1502 sbi
->s_mount_opt
|= data_opt
;
1505 case Opt_data_err_abort
:
1506 set_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1508 case Opt_data_err_ignore
:
1509 clear_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1513 if (!set_qf_name(sb
, USRQUOTA
, &args
[0]))
1517 if (!set_qf_name(sb
, GRPQUOTA
, &args
[0]))
1520 case Opt_offusrjquota
:
1521 if (!clear_qf_name(sb
, USRQUOTA
))
1524 case Opt_offgrpjquota
:
1525 if (!clear_qf_name(sb
, GRPQUOTA
))
1529 case Opt_jqfmt_vfsold
:
1530 qfmt
= QFMT_VFS_OLD
;
1532 case Opt_jqfmt_vfsv0
:
1535 case Opt_jqfmt_vfsv1
:
1538 if (sb_any_quota_loaded(sb
) &&
1539 sbi
->s_jquota_fmt
!= qfmt
) {
1540 ext4_msg(sb
, KERN_ERR
, "Cannot change "
1541 "journaled quota options when "
1545 sbi
->s_jquota_fmt
= qfmt
;
1549 set_opt(sbi
->s_mount_opt
, QUOTA
);
1550 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
1553 set_opt(sbi
->s_mount_opt
, QUOTA
);
1554 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1557 if (sb_any_quota_loaded(sb
)) {
1558 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1559 "options when quota turned on");
1562 clear_opt(sbi
->s_mount_opt
, QUOTA
);
1563 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1564 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1570 ext4_msg(sb
, KERN_ERR
,
1571 "quota options not supported");
1575 case Opt_offusrjquota
:
1576 case Opt_offgrpjquota
:
1577 case Opt_jqfmt_vfsold
:
1578 case Opt_jqfmt_vfsv0
:
1579 case Opt_jqfmt_vfsv1
:
1580 ext4_msg(sb
, KERN_ERR
,
1581 "journaled quota options not supported");
1587 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1590 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1594 if (match_int(&args
[0], &option
))
1597 option
= 1; /* No argument, default to 1 */
1599 set_opt(sbi
->s_mount_opt
, BARRIER
);
1601 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1607 ext4_msg(sb
, KERN_ERR
,
1608 "resize option only available "
1612 if (match_int(&args
[0], &option
) != 0)
1614 *n_blocks_count
= option
;
1617 set_opt(sbi
->s_mount_opt
, NOBH
);
1620 clear_opt(sbi
->s_mount_opt
, NOBH
);
1623 set_opt(sbi
->s_mount_opt
, I_VERSION
);
1624 sb
->s_flags
|= MS_I_VERSION
;
1626 case Opt_nodelalloc
:
1627 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
1630 if (match_int(&args
[0], &option
))
1634 sbi
->s_stripe
= option
;
1637 set_opt(sbi
->s_mount_opt
, DELALLOC
);
1639 case Opt_block_validity
:
1640 set_opt(sbi
->s_mount_opt
, BLOCK_VALIDITY
);
1642 case Opt_noblock_validity
:
1643 clear_opt(sbi
->s_mount_opt
, BLOCK_VALIDITY
);
1645 case Opt_inode_readahead_blks
:
1646 if (match_int(&args
[0], &option
))
1648 if (option
< 0 || option
> (1 << 30))
1650 if (!is_power_of_2(option
)) {
1651 ext4_msg(sb
, KERN_ERR
,
1652 "EXT4-fs: inode_readahead_blks"
1653 " must be a power of 2");
1656 sbi
->s_inode_readahead_blks
= option
;
1658 case Opt_journal_ioprio
:
1659 if (match_int(&args
[0], &option
))
1661 if (option
< 0 || option
> 7)
1663 *journal_ioprio
= IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
,
1666 case Opt_noauto_da_alloc
:
1667 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1669 case Opt_auto_da_alloc
:
1671 if (match_int(&args
[0], &option
))
1674 option
= 1; /* No argument, default to 1 */
1676 clear_opt(sbi
->s_mount_opt
, NO_AUTO_DA_ALLOC
);
1678 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1681 set_opt(sbi
->s_mount_opt
, DISCARD
);
1684 clear_opt(sbi
->s_mount_opt
, DISCARD
);
1686 case Opt_dioread_nolock
:
1687 set_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
1689 case Opt_dioread_lock
:
1690 clear_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
1693 ext4_msg(sb
, KERN_ERR
,
1694 "Unrecognized mount option \"%s\" "
1695 "or missing value", p
);
1700 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1701 if (test_opt(sb
, USRQUOTA
) && sbi
->s_qf_names
[USRQUOTA
])
1702 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1704 if (test_opt(sb
, GRPQUOTA
) && sbi
->s_qf_names
[GRPQUOTA
])
1705 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1707 if (test_opt(sb
, GRPQUOTA
) || test_opt(sb
, USRQUOTA
)) {
1708 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1713 if (!sbi
->s_jquota_fmt
) {
1714 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1719 if (sbi
->s_jquota_fmt
) {
1720 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1721 "specified with no journaling "
1730 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1733 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1736 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1737 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
1738 "forcing read-only mode");
1743 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1744 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
1745 "running e2fsck is recommended");
1746 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1747 ext4_msg(sb
, KERN_WARNING
,
1748 "warning: mounting fs with errors, "
1749 "running e2fsck is recommended");
1750 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
1751 le16_to_cpu(es
->s_mnt_count
) >=
1752 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1753 ext4_msg(sb
, KERN_WARNING
,
1754 "warning: maximal mount count reached, "
1755 "running e2fsck is recommended");
1756 else if (le32_to_cpu(es
->s_checkinterval
) &&
1757 (le32_to_cpu(es
->s_lastcheck
) +
1758 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1759 ext4_msg(sb
, KERN_WARNING
,
1760 "warning: checktime reached, "
1761 "running e2fsck is recommended");
1762 if (!sbi
->s_journal
)
1763 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1764 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1765 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1766 le16_add_cpu(&es
->s_mnt_count
, 1);
1767 es
->s_mtime
= cpu_to_le32(get_seconds());
1768 ext4_update_dynamic_rev(sb
);
1770 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1772 ext4_commit_super(sb
, 1);
1773 if (test_opt(sb
, DEBUG
))
1774 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
1775 "bpg=%lu, ipg=%lu, mo=%04x]\n",
1777 sbi
->s_groups_count
,
1778 EXT4_BLOCKS_PER_GROUP(sb
),
1779 EXT4_INODES_PER_GROUP(sb
),
1785 static int ext4_fill_flex_info(struct super_block
*sb
)
1787 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1788 struct ext4_group_desc
*gdp
= NULL
;
1789 ext4_group_t flex_group_count
;
1790 ext4_group_t flex_group
;
1791 int groups_per_flex
= 0;
1795 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1796 groups_per_flex
= 1 << sbi
->s_log_groups_per_flex
;
1798 if (groups_per_flex
< 2) {
1799 sbi
->s_log_groups_per_flex
= 0;
1803 /* We allocate both existing and potentially added groups */
1804 flex_group_count
= ((sbi
->s_groups_count
+ groups_per_flex
- 1) +
1805 ((le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
) + 1) <<
1806 EXT4_DESC_PER_BLOCK_BITS(sb
))) / groups_per_flex
;
1807 size
= flex_group_count
* sizeof(struct flex_groups
);
1808 sbi
->s_flex_groups
= kzalloc(size
, GFP_KERNEL
);
1809 if (sbi
->s_flex_groups
== NULL
) {
1810 sbi
->s_flex_groups
= vmalloc(size
);
1811 if (sbi
->s_flex_groups
)
1812 memset(sbi
->s_flex_groups
, 0, size
);
1814 if (sbi
->s_flex_groups
== NULL
) {
1815 ext4_msg(sb
, KERN_ERR
, "not enough memory for "
1816 "%u flex groups", flex_group_count
);
1820 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1821 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1823 flex_group
= ext4_flex_group(sbi
, i
);
1824 atomic_add(ext4_free_inodes_count(sb
, gdp
),
1825 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
1826 atomic_add(ext4_free_blks_count(sb
, gdp
),
1827 &sbi
->s_flex_groups
[flex_group
].free_blocks
);
1828 atomic_add(ext4_used_dirs_count(sb
, gdp
),
1829 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
1837 __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
1838 struct ext4_group_desc
*gdp
)
1842 if (sbi
->s_es
->s_feature_ro_compat
&
1843 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) {
1844 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
1845 __le32 le_group
= cpu_to_le32(block_group
);
1847 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
1848 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
1849 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
1850 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
1851 /* for checksum of struct ext4_group_desc do the rest...*/
1852 if ((sbi
->s_es
->s_feature_incompat
&
1853 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
1854 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
1855 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
1856 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
1860 return cpu_to_le16(crc
);
1863 int ext4_group_desc_csum_verify(struct ext4_sb_info
*sbi
, __u32 block_group
,
1864 struct ext4_group_desc
*gdp
)
1866 if ((sbi
->s_es
->s_feature_ro_compat
&
1867 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) &&
1868 (gdp
->bg_checksum
!= ext4_group_desc_csum(sbi
, block_group
, gdp
)))
1874 /* Called at mount-time, super-block is locked */
1875 static int ext4_check_descriptors(struct super_block
*sb
)
1877 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1878 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
1879 ext4_fsblk_t last_block
;
1880 ext4_fsblk_t block_bitmap
;
1881 ext4_fsblk_t inode_bitmap
;
1882 ext4_fsblk_t inode_table
;
1883 int flexbg_flag
= 0;
1886 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
1889 ext4_debug("Checking group descriptors");
1891 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1892 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1894 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
1895 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
1897 last_block
= first_block
+
1898 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
1900 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
1901 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
1902 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1903 "Block bitmap for group %u not in group "
1904 "(block %llu)!", i
, block_bitmap
);
1907 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
1908 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
1909 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1910 "Inode bitmap for group %u not in group "
1911 "(block %llu)!", i
, inode_bitmap
);
1914 inode_table
= ext4_inode_table(sb
, gdp
);
1915 if (inode_table
< first_block
||
1916 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
1917 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1918 "Inode table for group %u not in group "
1919 "(block %llu)!", i
, inode_table
);
1922 ext4_lock_group(sb
, i
);
1923 if (!ext4_group_desc_csum_verify(sbi
, i
, gdp
)) {
1924 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1925 "Checksum for group %u failed (%u!=%u)",
1926 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
1927 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
1928 if (!(sb
->s_flags
& MS_RDONLY
)) {
1929 ext4_unlock_group(sb
, i
);
1933 ext4_unlock_group(sb
, i
);
1935 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
1938 ext4_free_blocks_count_set(sbi
->s_es
, ext4_count_free_blocks(sb
));
1939 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
1943 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1944 * the superblock) which were deleted from all directories, but held open by
1945 * a process at the time of a crash. We walk the list and try to delete these
1946 * inodes at recovery time (only with a read-write filesystem).
1948 * In order to keep the orphan inode chain consistent during traversal (in
1949 * case of crash during recovery), we link each inode into the superblock
1950 * orphan list_head and handle it the same way as an inode deletion during
1951 * normal operation (which journals the operations for us).
1953 * We only do an iget() and an iput() on each inode, which is very safe if we
1954 * accidentally point at an in-use or already deleted inode. The worst that
1955 * can happen in this case is that we get a "bit already cleared" message from
1956 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1957 * e2fsck was run on this filesystem, and it must have already done the orphan
1958 * inode cleanup for us, so we can safely abort without any further action.
1960 static void ext4_orphan_cleanup(struct super_block
*sb
,
1961 struct ext4_super_block
*es
)
1963 unsigned int s_flags
= sb
->s_flags
;
1964 int nr_orphans
= 0, nr_truncates
= 0;
1968 if (!es
->s_last_orphan
) {
1969 jbd_debug(4, "no orphan inodes to clean up\n");
1973 if (bdev_read_only(sb
->s_bdev
)) {
1974 ext4_msg(sb
, KERN_ERR
, "write access "
1975 "unavailable, skipping orphan cleanup");
1979 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
1980 if (es
->s_last_orphan
)
1981 jbd_debug(1, "Errors on filesystem, "
1982 "clearing orphan list.\n");
1983 es
->s_last_orphan
= 0;
1984 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1988 if (s_flags
& MS_RDONLY
) {
1989 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
1990 sb
->s_flags
&= ~MS_RDONLY
;
1993 /* Needed for iput() to work correctly and not trash data */
1994 sb
->s_flags
|= MS_ACTIVE
;
1995 /* Turn on quotas so that they are updated correctly */
1996 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1997 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
1998 int ret
= ext4_quota_on_mount(sb
, i
);
2000 ext4_msg(sb
, KERN_ERR
,
2001 "Cannot turn on journaled "
2002 "quota: error %d", ret
);
2007 while (es
->s_last_orphan
) {
2008 struct inode
*inode
;
2010 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
2011 if (IS_ERR(inode
)) {
2012 es
->s_last_orphan
= 0;
2016 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
2018 if (inode
->i_nlink
) {
2019 ext4_msg(sb
, KERN_DEBUG
,
2020 "%s: truncating inode %lu to %lld bytes",
2021 __func__
, inode
->i_ino
, inode
->i_size
);
2022 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2023 inode
->i_ino
, inode
->i_size
);
2024 ext4_truncate(inode
);
2027 ext4_msg(sb
, KERN_DEBUG
,
2028 "%s: deleting unreferenced inode %lu",
2029 __func__
, inode
->i_ino
);
2030 jbd_debug(2, "deleting unreferenced inode %lu\n",
2034 iput(inode
); /* The delete magic happens here! */
2037 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2040 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
2041 PLURAL(nr_orphans
));
2043 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
2044 PLURAL(nr_truncates
));
2046 /* Turn quotas off */
2047 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2048 if (sb_dqopt(sb
)->files
[i
])
2049 vfs_quota_off(sb
, i
, 0);
2052 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
2056 * Maximal extent format file size.
2057 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2058 * extent format containers, within a sector_t, and within i_blocks
2059 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2060 * so that won't be a limiting factor.
2062 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2064 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
2067 loff_t upper_limit
= MAX_LFS_FILESIZE
;
2069 /* small i_blocks in vfs inode? */
2070 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2072 * CONFIG_LBDAF is not enabled implies the inode
2073 * i_block represent total blocks in 512 bytes
2074 * 32 == size of vfs inode i_blocks * 8
2076 upper_limit
= (1LL << 32) - 1;
2078 /* total blocks in file system block size */
2079 upper_limit
>>= (blkbits
- 9);
2080 upper_limit
<<= blkbits
;
2083 /* 32-bit extent-start container, ee_block */
2088 /* Sanity check against vm- & vfs- imposed limits */
2089 if (res
> upper_limit
)
2096 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2097 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2098 * We need to be 1 filesystem block less than the 2^48 sector limit.
2100 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2102 loff_t res
= EXT4_NDIR_BLOCKS
;
2105 /* This is calculated to be the largest file size for a dense, block
2106 * mapped file such that the file's total number of 512-byte sectors,
2107 * including data and all indirect blocks, does not exceed (2^48 - 1).
2109 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2110 * number of 512-byte sectors of the file.
2113 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2115 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2116 * the inode i_block field represents total file blocks in
2117 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2119 upper_limit
= (1LL << 32) - 1;
2121 /* total blocks in file system block size */
2122 upper_limit
>>= (bits
- 9);
2126 * We use 48 bit ext4_inode i_blocks
2127 * With EXT4_HUGE_FILE_FL set the i_blocks
2128 * represent total number of blocks in
2129 * file system block size
2131 upper_limit
= (1LL << 48) - 1;
2135 /* indirect blocks */
2137 /* double indirect blocks */
2138 meta_blocks
+= 1 + (1LL << (bits
-2));
2139 /* tripple indirect blocks */
2140 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2142 upper_limit
-= meta_blocks
;
2143 upper_limit
<<= bits
;
2145 res
+= 1LL << (bits
-2);
2146 res
+= 1LL << (2*(bits
-2));
2147 res
+= 1LL << (3*(bits
-2));
2149 if (res
> upper_limit
)
2152 if (res
> MAX_LFS_FILESIZE
)
2153 res
= MAX_LFS_FILESIZE
;
2158 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2159 ext4_fsblk_t logical_sb_block
, int nr
)
2161 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2162 ext4_group_t bg
, first_meta_bg
;
2165 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2167 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
2169 return logical_sb_block
+ nr
+ 1;
2170 bg
= sbi
->s_desc_per_block
* nr
;
2171 if (ext4_bg_has_super(sb
, bg
))
2174 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2178 * ext4_get_stripe_size: Get the stripe size.
2179 * @sbi: In memory super block info
2181 * If we have specified it via mount option, then
2182 * use the mount option value. If the value specified at mount time is
2183 * greater than the blocks per group use the super block value.
2184 * If the super block value is greater than blocks per group return 0.
2185 * Allocator needs it be less than blocks per group.
2188 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2190 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2191 unsigned long stripe_width
=
2192 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2194 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2195 return sbi
->s_stripe
;
2197 if (stripe_width
<= sbi
->s_blocks_per_group
)
2198 return stripe_width
;
2200 if (stride
<= sbi
->s_blocks_per_group
)
2209 struct attribute attr
;
2210 ssize_t (*show
)(struct ext4_attr
*, struct ext4_sb_info
*, char *);
2211 ssize_t (*store
)(struct ext4_attr
*, struct ext4_sb_info
*,
2212 const char *, size_t);
2216 static int parse_strtoul(const char *buf
,
2217 unsigned long max
, unsigned long *value
)
2221 *value
= simple_strtoul(skip_spaces(buf
), &endp
, 0);
2222 endp
= skip_spaces(endp
);
2223 if (*endp
|| *value
> max
)
2229 static ssize_t
delayed_allocation_blocks_show(struct ext4_attr
*a
,
2230 struct ext4_sb_info
*sbi
,
2233 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2234 (s64
) percpu_counter_sum(&sbi
->s_dirtyblocks_counter
));
2237 static ssize_t
session_write_kbytes_show(struct ext4_attr
*a
,
2238 struct ext4_sb_info
*sbi
, char *buf
)
2240 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2242 return snprintf(buf
, PAGE_SIZE
, "%lu\n",
2243 (part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2244 sbi
->s_sectors_written_start
) >> 1);
2247 static ssize_t
lifetime_write_kbytes_show(struct ext4_attr
*a
,
2248 struct ext4_sb_info
*sbi
, char *buf
)
2250 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2252 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2253 (unsigned long long)(sbi
->s_kbytes_written
+
2254 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2255 EXT4_SB(sb
)->s_sectors_written_start
) >> 1)));
2258 static ssize_t
inode_readahead_blks_store(struct ext4_attr
*a
,
2259 struct ext4_sb_info
*sbi
,
2260 const char *buf
, size_t count
)
2264 if (parse_strtoul(buf
, 0x40000000, &t
))
2267 if (!is_power_of_2(t
))
2270 sbi
->s_inode_readahead_blks
= t
;
2274 static ssize_t
sbi_ui_show(struct ext4_attr
*a
,
2275 struct ext4_sb_info
*sbi
, char *buf
)
2277 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2279 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
2282 static ssize_t
sbi_ui_store(struct ext4_attr
*a
,
2283 struct ext4_sb_info
*sbi
,
2284 const char *buf
, size_t count
)
2286 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2289 if (parse_strtoul(buf
, 0xffffffff, &t
))
2295 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2296 static struct ext4_attr ext4_attr_##_name = { \
2297 .attr = {.name = __stringify(_name), .mode = _mode }, \
2300 .offset = offsetof(struct ext4_sb_info, _elname), \
2302 #define EXT4_ATTR(name, mode, show, store) \
2303 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2305 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2306 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2307 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2308 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2309 #define ATTR_LIST(name) &ext4_attr_##name.attr
2311 EXT4_RO_ATTR(delayed_allocation_blocks
);
2312 EXT4_RO_ATTR(session_write_kbytes
);
2313 EXT4_RO_ATTR(lifetime_write_kbytes
);
2314 EXT4_ATTR_OFFSET(inode_readahead_blks
, 0644, sbi_ui_show
,
2315 inode_readahead_blks_store
, s_inode_readahead_blks
);
2316 EXT4_RW_ATTR_SBI_UI(inode_goal
, s_inode_goal
);
2317 EXT4_RW_ATTR_SBI_UI(mb_stats
, s_mb_stats
);
2318 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan
, s_mb_max_to_scan
);
2319 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan
, s_mb_min_to_scan
);
2320 EXT4_RW_ATTR_SBI_UI(mb_order2_req
, s_mb_order2_reqs
);
2321 EXT4_RW_ATTR_SBI_UI(mb_stream_req
, s_mb_stream_request
);
2322 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc
, s_mb_group_prealloc
);
2323 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump
, s_max_writeback_mb_bump
);
2325 static struct attribute
*ext4_attrs
[] = {
2326 ATTR_LIST(delayed_allocation_blocks
),
2327 ATTR_LIST(session_write_kbytes
),
2328 ATTR_LIST(lifetime_write_kbytes
),
2329 ATTR_LIST(inode_readahead_blks
),
2330 ATTR_LIST(inode_goal
),
2331 ATTR_LIST(mb_stats
),
2332 ATTR_LIST(mb_max_to_scan
),
2333 ATTR_LIST(mb_min_to_scan
),
2334 ATTR_LIST(mb_order2_req
),
2335 ATTR_LIST(mb_stream_req
),
2336 ATTR_LIST(mb_group_prealloc
),
2337 ATTR_LIST(max_writeback_mb_bump
),
2341 static ssize_t
ext4_attr_show(struct kobject
*kobj
,
2342 struct attribute
*attr
, char *buf
)
2344 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2346 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2348 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
2351 static ssize_t
ext4_attr_store(struct kobject
*kobj
,
2352 struct attribute
*attr
,
2353 const char *buf
, size_t len
)
2355 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2357 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2359 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
2362 static void ext4_sb_release(struct kobject
*kobj
)
2364 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2366 complete(&sbi
->s_kobj_unregister
);
2370 static struct sysfs_ops ext4_attr_ops
= {
2371 .show
= ext4_attr_show
,
2372 .store
= ext4_attr_store
,
2375 static struct kobj_type ext4_ktype
= {
2376 .default_attrs
= ext4_attrs
,
2377 .sysfs_ops
= &ext4_attr_ops
,
2378 .release
= ext4_sb_release
,
2382 * Check whether this filesystem can be mounted based on
2383 * the features present and the RDONLY/RDWR mount requested.
2384 * Returns 1 if this filesystem can be mounted as requested,
2385 * 0 if it cannot be.
2387 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2389 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
)) {
2390 ext4_msg(sb
, KERN_ERR
,
2391 "Couldn't mount because of "
2392 "unsupported optional features (%x)",
2393 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2394 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2401 /* Check that feature set is OK for a read-write mount */
2402 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
)) {
2403 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2404 "unsupported optional features (%x)",
2405 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2406 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2410 * Large file size enabled file system can only be mounted
2411 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2413 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
2414 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2415 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2416 "cannot be mounted RDWR without "
2424 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
2425 __releases(kernel_lock
)
2426 __acquires(kernel_lock
)
2428 struct buffer_head
*bh
;
2429 struct ext4_super_block
*es
= NULL
;
2430 struct ext4_sb_info
*sbi
;
2432 ext4_fsblk_t sb_block
= get_sb_block(&data
);
2433 ext4_fsblk_t logical_sb_block
;
2434 unsigned long offset
= 0;
2435 unsigned long journal_devnum
= 0;
2436 unsigned long def_mount_opts
;
2442 unsigned int db_count
;
2444 int needs_recovery
, has_huge_files
;
2447 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
2449 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
2453 sbi
->s_blockgroup_lock
=
2454 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
2455 if (!sbi
->s_blockgroup_lock
) {
2459 sb
->s_fs_info
= sbi
;
2460 sbi
->s_mount_opt
= 0;
2461 sbi
->s_resuid
= EXT4_DEF_RESUID
;
2462 sbi
->s_resgid
= EXT4_DEF_RESGID
;
2463 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
2464 sbi
->s_sb_block
= sb_block
;
2465 sbi
->s_sectors_written_start
= part_stat_read(sb
->s_bdev
->bd_part
,
2470 /* Cleanup superblock name */
2471 for (cp
= sb
->s_id
; (cp
= strchr(cp
, '/'));)
2474 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
2476 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
2481 * The ext4 superblock will not be buffer aligned for other than 1kB
2482 * block sizes. We need to calculate the offset from buffer start.
2484 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
2485 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2486 offset
= do_div(logical_sb_block
, blocksize
);
2488 logical_sb_block
= sb_block
;
2491 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
2492 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
2496 * Note: s_es must be initialized as soon as possible because
2497 * some ext4 macro-instructions depend on its value
2499 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
2501 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
2502 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
2504 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
2506 /* Set defaults before we parse the mount options */
2507 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
2508 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
2509 set_opt(sbi
->s_mount_opt
, DEBUG
);
2510 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
) {
2511 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, "bsdgroups",
2513 set_opt(sbi
->s_mount_opt
, GRPID
);
2515 if (def_mount_opts
& EXT4_DEFM_UID16
)
2516 set_opt(sbi
->s_mount_opt
, NO_UID32
);
2517 #ifdef CONFIG_EXT4_FS_XATTR
2518 if (def_mount_opts
& EXT4_DEFM_XATTR_USER
)
2519 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
2521 #ifdef CONFIG_EXT4_FS_POSIX_ACL
2522 if (def_mount_opts
& EXT4_DEFM_ACL
)
2523 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
2525 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
2526 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
2527 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
2528 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
2529 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
2530 set_opt(sbi
->s_mount_opt
, WRITEBACK_DATA
);
2532 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
2533 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
2534 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
2535 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
2537 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
2539 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
2540 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
2541 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
2542 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
2543 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
2545 set_opt(sbi
->s_mount_opt
, BARRIER
);
2548 * enable delayed allocation by default
2549 * Use -o nodelalloc to turn it off
2551 set_opt(sbi
->s_mount_opt
, DELALLOC
);
2553 if (!parse_options((char *) data
, sb
, &journal_devnum
,
2554 &journal_ioprio
, NULL
, 0))
2557 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
2558 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
2560 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
2561 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
2562 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
2563 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
2564 ext4_msg(sb
, KERN_WARNING
,
2565 "feature flags set on rev 0 fs, "
2566 "running e2fsck is recommended");
2569 * Check feature flags regardless of the revision level, since we
2570 * previously didn't change the revision level when setting the flags,
2571 * so there is a chance incompat flags are set on a rev 0 filesystem.
2573 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
2576 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
2578 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
2579 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
2580 ext4_msg(sb
, KERN_ERR
,
2581 "Unsupported filesystem blocksize %d", blocksize
);
2585 if (sb
->s_blocksize
!= blocksize
) {
2586 /* Validate the filesystem blocksize */
2587 if (!sb_set_blocksize(sb
, blocksize
)) {
2588 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
2594 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2595 offset
= do_div(logical_sb_block
, blocksize
);
2596 bh
= sb_bread(sb
, logical_sb_block
);
2598 ext4_msg(sb
, KERN_ERR
,
2599 "Can't read superblock on 2nd try");
2602 es
= (struct ext4_super_block
*)(((char *)bh
->b_data
) + offset
);
2604 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
2605 ext4_msg(sb
, KERN_ERR
,
2606 "Magic mismatch, very weird!");
2611 has_huge_files
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2612 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
);
2613 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
2615 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
2617 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
2618 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
2619 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
2621 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
2622 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
2623 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
2624 (!is_power_of_2(sbi
->s_inode_size
)) ||
2625 (sbi
->s_inode_size
> blocksize
)) {
2626 ext4_msg(sb
, KERN_ERR
,
2627 "unsupported inode size: %d",
2631 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
2632 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
2635 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
2636 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
2637 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
2638 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
2639 !is_power_of_2(sbi
->s_desc_size
)) {
2640 ext4_msg(sb
, KERN_ERR
,
2641 "unsupported descriptor size %lu",
2646 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
2648 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
2649 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
2650 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
2653 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
2654 if (sbi
->s_inodes_per_block
== 0)
2656 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
2657 sbi
->s_inodes_per_block
;
2658 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
2660 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
2661 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
2662 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
2664 for (i
= 0; i
< 4; i
++)
2665 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
2666 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
2667 i
= le32_to_cpu(es
->s_flags
);
2668 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
2669 sbi
->s_hash_unsigned
= 3;
2670 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
2671 #ifdef __CHAR_UNSIGNED__
2672 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
2673 sbi
->s_hash_unsigned
= 3;
2675 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
2680 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
2681 ext4_msg(sb
, KERN_ERR
,
2682 "#blocks per group too big: %lu",
2683 sbi
->s_blocks_per_group
);
2686 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
2687 ext4_msg(sb
, KERN_ERR
,
2688 "#inodes per group too big: %lu",
2689 sbi
->s_inodes_per_group
);
2694 * Test whether we have more sectors than will fit in sector_t,
2695 * and whether the max offset is addressable by the page cache.
2697 if ((ext4_blocks_count(es
) >
2698 (sector_t
)(~0ULL) >> (sb
->s_blocksize_bits
- 9)) ||
2699 (ext4_blocks_count(es
) >
2700 (pgoff_t
)(~0ULL) >> (PAGE_CACHE_SHIFT
- sb
->s_blocksize_bits
))) {
2701 ext4_msg(sb
, KERN_ERR
, "filesystem"
2702 " too large to mount safely on this system");
2703 if (sizeof(sector_t
) < 8)
2704 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
2709 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
2712 /* check blocks count against device size */
2713 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
2714 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
2715 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
2716 "exceeds size of device (%llu blocks)",
2717 ext4_blocks_count(es
), blocks_count
);
2722 * It makes no sense for the first data block to be beyond the end
2723 * of the filesystem.
2725 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
2726 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data"
2727 "block %u is beyond end of filesystem (%llu)",
2728 le32_to_cpu(es
->s_first_data_block
),
2729 ext4_blocks_count(es
));
2732 blocks_count
= (ext4_blocks_count(es
) -
2733 le32_to_cpu(es
->s_first_data_block
) +
2734 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2735 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
2736 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
2737 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
2738 "(block count %llu, first data block %u, "
2739 "blocks per group %lu)", sbi
->s_groups_count
,
2740 ext4_blocks_count(es
),
2741 le32_to_cpu(es
->s_first_data_block
),
2742 EXT4_BLOCKS_PER_GROUP(sb
));
2745 sbi
->s_groups_count
= blocks_count
;
2746 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
2747 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
2748 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
2749 EXT4_DESC_PER_BLOCK(sb
);
2750 sbi
->s_group_desc
= kmalloc(db_count
* sizeof(struct buffer_head
*),
2752 if (sbi
->s_group_desc
== NULL
) {
2753 ext4_msg(sb
, KERN_ERR
, "not enough memory");
2757 #ifdef CONFIG_PROC_FS
2759 sbi
->s_proc
= proc_mkdir(sb
->s_id
, ext4_proc_root
);
2762 bgl_lock_init(sbi
->s_blockgroup_lock
);
2764 for (i
= 0; i
< db_count
; i
++) {
2765 block
= descriptor_loc(sb
, logical_sb_block
, i
);
2766 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
2767 if (!sbi
->s_group_desc
[i
]) {
2768 ext4_msg(sb
, KERN_ERR
,
2769 "can't read group descriptor %d", i
);
2774 if (!ext4_check_descriptors(sb
)) {
2775 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
2778 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
2779 if (!ext4_fill_flex_info(sb
)) {
2780 ext4_msg(sb
, KERN_ERR
,
2781 "unable to initialize "
2782 "flex_bg meta info!");
2786 sbi
->s_gdb_count
= db_count
;
2787 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
2788 spin_lock_init(&sbi
->s_next_gen_lock
);
2790 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
2791 ext4_count_free_blocks(sb
));
2793 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
2794 ext4_count_free_inodes(sb
));
2797 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
2798 ext4_count_dirs(sb
));
2801 err
= percpu_counter_init(&sbi
->s_dirtyblocks_counter
, 0);
2804 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
2808 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
2809 sbi
->s_max_writeback_mb_bump
= 128;
2812 * set up enough so that it can read an inode
2814 if (!test_opt(sb
, NOLOAD
) &&
2815 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
2816 sb
->s_op
= &ext4_sops
;
2818 sb
->s_op
= &ext4_nojournal_sops
;
2819 sb
->s_export_op
= &ext4_export_ops
;
2820 sb
->s_xattr
= ext4_xattr_handlers
;
2822 sb
->s_qcop
= &ext4_qctl_operations
;
2823 sb
->dq_op
= &ext4_quota_operations
;
2825 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
2826 mutex_init(&sbi
->s_orphan_lock
);
2827 mutex_init(&sbi
->s_resize_lock
);
2831 needs_recovery
= (es
->s_last_orphan
!= 0 ||
2832 EXT4_HAS_INCOMPAT_FEATURE(sb
,
2833 EXT4_FEATURE_INCOMPAT_RECOVER
));
2836 * The first inode we look at is the journal inode. Don't try
2837 * root first: it may be modified in the journal!
2839 if (!test_opt(sb
, NOLOAD
) &&
2840 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
2841 if (ext4_load_journal(sb
, es
, journal_devnum
))
2843 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
2844 EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
2845 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
2846 "suppressed and not mounted read-only");
2847 goto failed_mount_wq
;
2849 clear_opt(sbi
->s_mount_opt
, DATA_FLAGS
);
2850 set_opt(sbi
->s_mount_opt
, WRITEBACK_DATA
);
2851 sbi
->s_journal
= NULL
;
2856 if (ext4_blocks_count(es
) > 0xffffffffULL
&&
2857 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
2858 JBD2_FEATURE_INCOMPAT_64BIT
)) {
2859 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
2860 goto failed_mount_wq
;
2863 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
2864 jbd2_journal_set_features(sbi
->s_journal
,
2865 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2866 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2867 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
2868 jbd2_journal_set_features(sbi
->s_journal
,
2869 JBD2_FEATURE_COMPAT_CHECKSUM
, 0, 0);
2870 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
2871 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2873 jbd2_journal_clear_features(sbi
->s_journal
,
2874 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2875 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2878 /* We have now updated the journal if required, so we can
2879 * validate the data journaling mode. */
2880 switch (test_opt(sb
, DATA_FLAGS
)) {
2882 /* No mode set, assume a default based on the journal
2883 * capabilities: ORDERED_DATA if the journal can
2884 * cope, else JOURNAL_DATA
2886 if (jbd2_journal_check_available_features
2887 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
2888 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
2890 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
2893 case EXT4_MOUNT_ORDERED_DATA
:
2894 case EXT4_MOUNT_WRITEBACK_DATA
:
2895 if (!jbd2_journal_check_available_features
2896 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
2897 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
2898 "requested data journaling mode");
2899 goto failed_mount_wq
;
2904 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
2907 if (test_opt(sb
, NOBH
)) {
2908 if (!(test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)) {
2909 ext4_msg(sb
, KERN_WARNING
, "Ignoring nobh option - "
2910 "its supported only with writeback mode");
2911 clear_opt(sbi
->s_mount_opt
, NOBH
);
2913 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
2914 ext4_msg(sb
, KERN_WARNING
, "dioread_nolock option is "
2915 "not supported with nobh mode");
2916 goto failed_mount_wq
;
2919 EXT4_SB(sb
)->dio_unwritten_wq
= create_workqueue("ext4-dio-unwritten");
2920 if (!EXT4_SB(sb
)->dio_unwritten_wq
) {
2921 printk(KERN_ERR
"EXT4-fs: failed to create DIO workqueue\n");
2922 goto failed_mount_wq
;
2926 * The jbd2_journal_load will have done any necessary log recovery,
2927 * so we can safely mount the rest of the filesystem now.
2930 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
2932 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
2933 ret
= PTR_ERR(root
);
2936 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
2938 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
2941 sb
->s_root
= d_alloc_root(root
);
2943 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
2949 ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
);
2951 /* determine the minimum size of new large inodes, if present */
2952 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
2953 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2954 EXT4_GOOD_OLD_INODE_SIZE
;
2955 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2956 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
2957 if (sbi
->s_want_extra_isize
<
2958 le16_to_cpu(es
->s_want_extra_isize
))
2959 sbi
->s_want_extra_isize
=
2960 le16_to_cpu(es
->s_want_extra_isize
);
2961 if (sbi
->s_want_extra_isize
<
2962 le16_to_cpu(es
->s_min_extra_isize
))
2963 sbi
->s_want_extra_isize
=
2964 le16_to_cpu(es
->s_min_extra_isize
);
2967 /* Check if enough inode space is available */
2968 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
2969 sbi
->s_inode_size
) {
2970 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2971 EXT4_GOOD_OLD_INODE_SIZE
;
2972 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
2976 if (test_opt(sb
, DELALLOC
) &&
2977 (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)) {
2978 ext4_msg(sb
, KERN_WARNING
, "Ignoring delalloc option - "
2979 "requested data journaling mode");
2980 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
2982 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
2983 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
2984 ext4_msg(sb
, KERN_WARNING
, "Ignoring dioread_nolock "
2985 "option - requested data journaling mode");
2986 clear_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
2988 if (sb
->s_blocksize
< PAGE_SIZE
) {
2989 ext4_msg(sb
, KERN_WARNING
, "Ignoring dioread_nolock "
2990 "option - block size is too small");
2991 clear_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
2995 err
= ext4_setup_system_zone(sb
);
2997 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
2998 "zone (%d)\n", err
);
3003 err
= ext4_mb_init(sb
, needs_recovery
);
3005 ext4_msg(sb
, KERN_ERR
, "failed to initalize mballoc (%d)",
3010 sbi
->s_kobj
.kset
= ext4_kset
;
3011 init_completion(&sbi
->s_kobj_unregister
);
3012 err
= kobject_init_and_add(&sbi
->s_kobj
, &ext4_ktype
, NULL
,
3015 ext4_mb_release(sb
);
3016 ext4_ext_release(sb
);
3020 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
3021 ext4_orphan_cleanup(sb
, es
);
3022 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
3023 if (needs_recovery
) {
3024 ext4_msg(sb
, KERN_INFO
, "recovery complete");
3025 ext4_mark_recovery_complete(sb
, es
);
3027 if (EXT4_SB(sb
)->s_journal
) {
3028 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
3029 descr
= " journalled data mode";
3030 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
3031 descr
= " ordered data mode";
3033 descr
= " writeback data mode";
3035 descr
= "out journal";
3037 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s", descr
);
3044 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
3048 ext4_msg(sb
, KERN_ERR
, "mount failed");
3049 destroy_workqueue(EXT4_SB(sb
)->dio_unwritten_wq
);
3051 ext4_release_system_zone(sb
);
3052 if (sbi
->s_journal
) {
3053 jbd2_journal_destroy(sbi
->s_journal
);
3054 sbi
->s_journal
= NULL
;
3057 if (sbi
->s_flex_groups
) {
3058 if (is_vmalloc_addr(sbi
->s_flex_groups
))
3059 vfree(sbi
->s_flex_groups
);
3061 kfree(sbi
->s_flex_groups
);
3063 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
3064 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
3065 percpu_counter_destroy(&sbi
->s_dirs_counter
);
3066 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
3068 for (i
= 0; i
< db_count
; i
++)
3069 brelse(sbi
->s_group_desc
[i
]);
3070 kfree(sbi
->s_group_desc
);
3073 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
3076 for (i
= 0; i
< MAXQUOTAS
; i
++)
3077 kfree(sbi
->s_qf_names
[i
]);
3079 ext4_blkdev_remove(sbi
);
3082 sb
->s_fs_info
= NULL
;
3083 kfree(sbi
->s_blockgroup_lock
);
3090 * Setup any per-fs journal parameters now. We'll do this both on
3091 * initial mount, once the journal has been initialised but before we've
3092 * done any recovery; and again on any subsequent remount.
3094 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
3096 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3098 journal
->j_commit_interval
= sbi
->s_commit_interval
;
3099 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
3100 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
3102 spin_lock(&journal
->j_state_lock
);
3103 if (test_opt(sb
, BARRIER
))
3104 journal
->j_flags
|= JBD2_BARRIER
;
3106 journal
->j_flags
&= ~JBD2_BARRIER
;
3107 if (test_opt(sb
, DATA_ERR_ABORT
))
3108 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
3110 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
3111 spin_unlock(&journal
->j_state_lock
);
3114 static journal_t
*ext4_get_journal(struct super_block
*sb
,
3115 unsigned int journal_inum
)
3117 struct inode
*journal_inode
;
3120 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3122 /* First, test for the existence of a valid inode on disk. Bad
3123 * things happen if we iget() an unused inode, as the subsequent
3124 * iput() will try to delete it. */
3126 journal_inode
= ext4_iget(sb
, journal_inum
);
3127 if (IS_ERR(journal_inode
)) {
3128 ext4_msg(sb
, KERN_ERR
, "no journal found");
3131 if (!journal_inode
->i_nlink
) {
3132 make_bad_inode(journal_inode
);
3133 iput(journal_inode
);
3134 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
3138 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3139 journal_inode
, journal_inode
->i_size
);
3140 if (!S_ISREG(journal_inode
->i_mode
)) {
3141 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
3142 iput(journal_inode
);
3146 journal
= jbd2_journal_init_inode(journal_inode
);
3148 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
3149 iput(journal_inode
);
3152 journal
->j_private
= sb
;
3153 ext4_init_journal_params(sb
, journal
);
3157 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
3160 struct buffer_head
*bh
;
3164 int hblock
, blocksize
;
3165 ext4_fsblk_t sb_block
;
3166 unsigned long offset
;
3167 struct ext4_super_block
*es
;
3168 struct block_device
*bdev
;
3170 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3172 bdev
= ext4_blkdev_get(j_dev
, sb
);
3176 if (bd_claim(bdev
, sb
)) {
3177 ext4_msg(sb
, KERN_ERR
,
3178 "failed to claim external journal device");
3179 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
3183 blocksize
= sb
->s_blocksize
;
3184 hblock
= bdev_logical_block_size(bdev
);
3185 if (blocksize
< hblock
) {
3186 ext4_msg(sb
, KERN_ERR
,
3187 "blocksize too small for journal device");
3191 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
3192 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
3193 set_blocksize(bdev
, blocksize
);
3194 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
3195 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
3196 "external journal");
3200 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
3201 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
3202 !(le32_to_cpu(es
->s_feature_incompat
) &
3203 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
3204 ext4_msg(sb
, KERN_ERR
, "external journal has "
3210 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
3211 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
3216 len
= ext4_blocks_count(es
);
3217 start
= sb_block
+ 1;
3218 brelse(bh
); /* we're done with the superblock */
3220 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
3221 start
, len
, blocksize
);
3223 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
3226 journal
->j_private
= sb
;
3227 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
3228 wait_on_buffer(journal
->j_sb_buffer
);
3229 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
3230 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
3233 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
3234 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
3235 "user (unsupported) - %d",
3236 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
3239 EXT4_SB(sb
)->journal_bdev
= bdev
;
3240 ext4_init_journal_params(sb
, journal
);
3244 jbd2_journal_destroy(journal
);
3246 ext4_blkdev_put(bdev
);
3250 static int ext4_load_journal(struct super_block
*sb
,
3251 struct ext4_super_block
*es
,
3252 unsigned long journal_devnum
)
3255 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
3258 int really_read_only
;
3260 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3262 if (journal_devnum
&&
3263 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3264 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
3265 "numbers have changed");
3266 journal_dev
= new_decode_dev(journal_devnum
);
3268 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
3270 really_read_only
= bdev_read_only(sb
->s_bdev
);
3273 * Are we loading a blank journal or performing recovery after a
3274 * crash? For recovery, we need to check in advance whether we
3275 * can get read-write access to the device.
3277 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3278 if (sb
->s_flags
& MS_RDONLY
) {
3279 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
3280 "required on readonly filesystem");
3281 if (really_read_only
) {
3282 ext4_msg(sb
, KERN_ERR
, "write access "
3283 "unavailable, cannot proceed");
3286 ext4_msg(sb
, KERN_INFO
, "write access will "
3287 "be enabled during recovery");
3291 if (journal_inum
&& journal_dev
) {
3292 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
3293 "and inode journals!");
3298 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
3301 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
3305 if (!(journal
->j_flags
& JBD2_BARRIER
))
3306 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
3308 if (!really_read_only
&& test_opt(sb
, UPDATE_JOURNAL
)) {
3309 err
= jbd2_journal_update_format(journal
);
3311 ext4_msg(sb
, KERN_ERR
, "error updating journal");
3312 jbd2_journal_destroy(journal
);
3317 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
3318 err
= jbd2_journal_wipe(journal
, !really_read_only
);
3320 err
= jbd2_journal_load(journal
);
3323 ext4_msg(sb
, KERN_ERR
, "error loading journal");
3324 jbd2_journal_destroy(journal
);
3328 EXT4_SB(sb
)->s_journal
= journal
;
3329 ext4_clear_journal_err(sb
, es
);
3331 if (journal_devnum
&&
3332 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3333 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
3335 /* Make sure we flush the recovery flag to disk. */
3336 ext4_commit_super(sb
, 1);
3342 static int ext4_commit_super(struct super_block
*sb
, int sync
)
3344 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
3345 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
3350 if (buffer_write_io_error(sbh
)) {
3352 * Oh, dear. A previous attempt to write the
3353 * superblock failed. This could happen because the
3354 * USB device was yanked out. Or it could happen to
3355 * be a transient write error and maybe the block will
3356 * be remapped. Nothing we can do but to retry the
3357 * write and hope for the best.
3359 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
3360 "superblock detected");
3361 clear_buffer_write_io_error(sbh
);
3362 set_buffer_uptodate(sbh
);
3365 * If the file system is mounted read-only, don't update the
3366 * superblock write time. This avoids updating the superblock
3367 * write time when we are mounting the root file system
3368 * read/only but we need to replay the journal; at that point,
3369 * for people who are east of GMT and who make their clock
3370 * tick in localtime for Windows bug-for-bug compatibility,
3371 * the clock is set in the future, and this will cause e2fsck
3372 * to complain and force a full file system check.
3374 if (!(sb
->s_flags
& MS_RDONLY
))
3375 es
->s_wtime
= cpu_to_le32(get_seconds());
3376 es
->s_kbytes_written
=
3377 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
3378 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
3379 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
3380 ext4_free_blocks_count_set(es
, percpu_counter_sum_positive(
3381 &EXT4_SB(sb
)->s_freeblocks_counter
));
3382 es
->s_free_inodes_count
= cpu_to_le32(percpu_counter_sum_positive(
3383 &EXT4_SB(sb
)->s_freeinodes_counter
));
3385 BUFFER_TRACE(sbh
, "marking dirty");
3386 mark_buffer_dirty(sbh
);
3388 error
= sync_dirty_buffer(sbh
);
3392 error
= buffer_write_io_error(sbh
);
3394 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
3396 clear_buffer_write_io_error(sbh
);
3397 set_buffer_uptodate(sbh
);
3404 * Have we just finished recovery? If so, and if we are mounting (or
3405 * remounting) the filesystem readonly, then we will end up with a
3406 * consistent fs on disk. Record that fact.
3408 static void ext4_mark_recovery_complete(struct super_block
*sb
,
3409 struct ext4_super_block
*es
)
3411 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
3413 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
3414 BUG_ON(journal
!= NULL
);
3417 jbd2_journal_lock_updates(journal
);
3418 if (jbd2_journal_flush(journal
) < 0)
3421 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
3422 sb
->s_flags
& MS_RDONLY
) {
3423 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3424 ext4_commit_super(sb
, 1);
3428 jbd2_journal_unlock_updates(journal
);
3432 * If we are mounting (or read-write remounting) a filesystem whose journal
3433 * has recorded an error from a previous lifetime, move that error to the
3434 * main filesystem now.
3436 static void ext4_clear_journal_err(struct super_block
*sb
,
3437 struct ext4_super_block
*es
)
3443 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3445 journal
= EXT4_SB(sb
)->s_journal
;
3448 * Now check for any error status which may have been recorded in the
3449 * journal by a prior ext4_error() or ext4_abort()
3452 j_errno
= jbd2_journal_errno(journal
);
3456 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
3457 ext4_warning(sb
, "Filesystem error recorded "
3458 "from previous mount: %s", errstr
);
3459 ext4_warning(sb
, "Marking fs in need of filesystem check.");
3461 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
3462 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
3463 ext4_commit_super(sb
, 1);
3465 jbd2_journal_clear_err(journal
);
3470 * Force the running and committing transactions to commit,
3471 * and wait on the commit.
3473 int ext4_force_commit(struct super_block
*sb
)
3478 if (sb
->s_flags
& MS_RDONLY
)
3481 journal
= EXT4_SB(sb
)->s_journal
;
3483 ret
= ext4_journal_force_commit(journal
);
3488 static void ext4_write_super(struct super_block
*sb
)
3491 ext4_commit_super(sb
, 1);
3495 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
3499 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3501 trace_ext4_sync_fs(sb
, wait
);
3502 flush_workqueue(sbi
->dio_unwritten_wq
);
3503 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
3505 jbd2_log_wait_commit(sbi
->s_journal
, target
);
3511 * LVM calls this function before a (read-only) snapshot is created. This
3512 * gives us a chance to flush the journal completely and mark the fs clean.
3514 static int ext4_freeze(struct super_block
*sb
)
3519 if (sb
->s_flags
& MS_RDONLY
)
3522 journal
= EXT4_SB(sb
)->s_journal
;
3524 /* Now we set up the journal barrier. */
3525 jbd2_journal_lock_updates(journal
);
3528 * Don't clear the needs_recovery flag if we failed to flush
3531 error
= jbd2_journal_flush(journal
);
3534 jbd2_journal_unlock_updates(journal
);
3538 /* Journal blocked and flushed, clear needs_recovery flag. */
3539 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3540 error
= ext4_commit_super(sb
, 1);
3547 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3548 * flag here, even though the filesystem is not technically dirty yet.
3550 static int ext4_unfreeze(struct super_block
*sb
)
3552 if (sb
->s_flags
& MS_RDONLY
)
3556 /* Reset the needs_recovery flag before the fs is unlocked. */
3557 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3558 ext4_commit_super(sb
, 1);
3560 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
3564 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
3566 struct ext4_super_block
*es
;
3567 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3568 ext4_fsblk_t n_blocks_count
= 0;
3569 unsigned long old_sb_flags
;
3570 struct ext4_mount_options old_opts
;
3572 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3580 /* Store the original options */
3582 old_sb_flags
= sb
->s_flags
;
3583 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
3584 old_opts
.s_resuid
= sbi
->s_resuid
;
3585 old_opts
.s_resgid
= sbi
->s_resgid
;
3586 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
3587 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
3588 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
3590 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
3591 for (i
= 0; i
< MAXQUOTAS
; i
++)
3592 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
3594 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
3595 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
3598 * Allow the "check" option to be passed as a remount option.
3600 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
,
3601 &n_blocks_count
, 1)) {
3606 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
3607 ext4_abort(sb
, __func__
, "Abort forced by user");
3609 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3610 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
3614 if (sbi
->s_journal
) {
3615 ext4_init_journal_params(sb
, sbi
->s_journal
);
3616 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
3619 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
) ||
3620 n_blocks_count
> ext4_blocks_count(es
)) {
3621 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
3626 if (*flags
& MS_RDONLY
) {
3628 * First of all, the unconditional stuff we have to do
3629 * to disable replay of the journal when we next remount
3631 sb
->s_flags
|= MS_RDONLY
;
3634 * OK, test if we are remounting a valid rw partition
3635 * readonly, and if so set the rdonly flag and then
3636 * mark the partition as valid again.
3638 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
3639 (sbi
->s_mount_state
& EXT4_VALID_FS
))
3640 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
3643 ext4_mark_recovery_complete(sb
, es
);
3645 /* Make sure we can mount this feature set readwrite */
3646 if (!ext4_feature_set_ok(sb
, 0)) {
3651 * Make sure the group descriptor checksums
3652 * are sane. If they aren't, refuse to remount r/w.
3654 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
3655 struct ext4_group_desc
*gdp
=
3656 ext4_get_group_desc(sb
, g
, NULL
);
3658 if (!ext4_group_desc_csum_verify(sbi
, g
, gdp
)) {
3659 ext4_msg(sb
, KERN_ERR
,
3660 "ext4_remount: Checksum for group %u failed (%u!=%u)",
3661 g
, le16_to_cpu(ext4_group_desc_csum(sbi
, g
, gdp
)),
3662 le16_to_cpu(gdp
->bg_checksum
));
3669 * If we have an unprocessed orphan list hanging
3670 * around from a previously readonly bdev mount,
3671 * require a full umount/remount for now.
3673 if (es
->s_last_orphan
) {
3674 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
3675 "remount RDWR because of unprocessed "
3676 "orphan inode list. Please "
3677 "umount/remount instead");
3683 * Mounting a RDONLY partition read-write, so reread
3684 * and store the current valid flag. (It may have
3685 * been changed by e2fsck since we originally mounted
3689 ext4_clear_journal_err(sb
, es
);
3690 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3691 if ((err
= ext4_group_extend(sb
, es
, n_blocks_count
)))
3693 if (!ext4_setup_super(sb
, es
, 0))
3694 sb
->s_flags
&= ~MS_RDONLY
;
3697 ext4_setup_system_zone(sb
);
3698 if (sbi
->s_journal
== NULL
)
3699 ext4_commit_super(sb
, 1);
3702 /* Release old quota file names */
3703 for (i
= 0; i
< MAXQUOTAS
; i
++)
3704 if (old_opts
.s_qf_names
[i
] &&
3705 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3706 kfree(old_opts
.s_qf_names
[i
]);
3713 sb
->s_flags
= old_sb_flags
;
3714 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
3715 sbi
->s_resuid
= old_opts
.s_resuid
;
3716 sbi
->s_resgid
= old_opts
.s_resgid
;
3717 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
3718 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
3719 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
3721 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
3722 for (i
= 0; i
< MAXQUOTAS
; i
++) {
3723 if (sbi
->s_qf_names
[i
] &&
3724 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3725 kfree(sbi
->s_qf_names
[i
]);
3726 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
3734 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
3736 struct super_block
*sb
= dentry
->d_sb
;
3737 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3738 struct ext4_super_block
*es
= sbi
->s_es
;
3741 if (test_opt(sb
, MINIX_DF
)) {
3742 sbi
->s_overhead_last
= 0;
3743 } else if (sbi
->s_blocks_last
!= ext4_blocks_count(es
)) {
3744 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3745 ext4_fsblk_t overhead
= 0;
3748 * Compute the overhead (FS structures). This is constant
3749 * for a given filesystem unless the number of block groups
3750 * changes so we cache the previous value until it does.
3754 * All of the blocks before first_data_block are
3757 overhead
= le32_to_cpu(es
->s_first_data_block
);
3760 * Add the overhead attributed to the superblock and
3761 * block group descriptors. If the sparse superblocks
3762 * feature is turned on, then not all groups have this.
3764 for (i
= 0; i
< ngroups
; i
++) {
3765 overhead
+= ext4_bg_has_super(sb
, i
) +
3766 ext4_bg_num_gdb(sb
, i
);
3771 * Every block group has an inode bitmap, a block
3772 * bitmap, and an inode table.
3774 overhead
+= ngroups
* (2 + sbi
->s_itb_per_group
);
3775 sbi
->s_overhead_last
= overhead
;
3777 sbi
->s_blocks_last
= ext4_blocks_count(es
);
3780 buf
->f_type
= EXT4_SUPER_MAGIC
;
3781 buf
->f_bsize
= sb
->s_blocksize
;
3782 buf
->f_blocks
= ext4_blocks_count(es
) - sbi
->s_overhead_last
;
3783 buf
->f_bfree
= percpu_counter_sum_positive(&sbi
->s_freeblocks_counter
) -
3784 percpu_counter_sum_positive(&sbi
->s_dirtyblocks_counter
);
3785 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
3786 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
3788 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
3789 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
3790 buf
->f_namelen
= EXT4_NAME_LEN
;
3791 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
3792 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
3793 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
3794 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
3799 /* Helper function for writing quotas on sync - we need to start transaction
3800 * before quota file is locked for write. Otherwise the are possible deadlocks:
3801 * Process 1 Process 2
3802 * ext4_create() quota_sync()
3803 * jbd2_journal_start() write_dquot()
3804 * vfs_dq_init() down(dqio_mutex)
3805 * down(dqio_mutex) jbd2_journal_start()
3811 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
3813 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_type
];
3816 static int ext4_write_dquot(struct dquot
*dquot
)
3820 struct inode
*inode
;
3822 inode
= dquot_to_inode(dquot
);
3823 handle
= ext4_journal_start(inode
,
3824 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
3826 return PTR_ERR(handle
);
3827 ret
= dquot_commit(dquot
);
3828 err
= ext4_journal_stop(handle
);
3834 static int ext4_acquire_dquot(struct dquot
*dquot
)
3839 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3840 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
3842 return PTR_ERR(handle
);
3843 ret
= dquot_acquire(dquot
);
3844 err
= ext4_journal_stop(handle
);
3850 static int ext4_release_dquot(struct dquot
*dquot
)
3855 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3856 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
3857 if (IS_ERR(handle
)) {
3858 /* Release dquot anyway to avoid endless cycle in dqput() */
3859 dquot_release(dquot
);
3860 return PTR_ERR(handle
);
3862 ret
= dquot_release(dquot
);
3863 err
= ext4_journal_stop(handle
);
3869 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
3871 /* Are we journaling quotas? */
3872 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
3873 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
3874 dquot_mark_dquot_dirty(dquot
);
3875 return ext4_write_dquot(dquot
);
3877 return dquot_mark_dquot_dirty(dquot
);
3881 static int ext4_write_info(struct super_block
*sb
, int type
)
3886 /* Data block + inode block */
3887 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
3889 return PTR_ERR(handle
);
3890 ret
= dquot_commit_info(sb
, type
);
3891 err
= ext4_journal_stop(handle
);
3898 * Turn on quotas during mount time - we need to find
3899 * the quota file and such...
3901 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
3903 return vfs_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
3904 EXT4_SB(sb
)->s_jquota_fmt
, type
);
3908 * Standard function to be called on quota_on
3910 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
3911 char *name
, int remount
)
3916 if (!test_opt(sb
, QUOTA
))
3918 /* When remounting, no checks are needed and in fact, name is NULL */
3920 return vfs_quota_on(sb
, type
, format_id
, name
, remount
);
3922 err
= kern_path(name
, LOOKUP_FOLLOW
, &path
);
3926 /* Quotafile not on the same filesystem? */
3927 if (path
.mnt
->mnt_sb
!= sb
) {
3931 /* Journaling quota? */
3932 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
3933 /* Quotafile not in fs root? */
3934 if (path
.dentry
->d_parent
!= sb
->s_root
)
3935 ext4_msg(sb
, KERN_WARNING
,
3936 "Quota file not on filesystem root. "
3937 "Journaled quota will not work");
3941 * When we journal data on quota file, we have to flush journal to see
3942 * all updates to the file when we bypass pagecache...
3944 if (EXT4_SB(sb
)->s_journal
&&
3945 ext4_should_journal_data(path
.dentry
->d_inode
)) {
3947 * We don't need to lock updates but journal_flush() could
3948 * otherwise be livelocked...
3950 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
3951 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
3952 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
3959 err
= vfs_quota_on_path(sb
, type
, format_id
, &path
);
3964 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3965 * acquiring the locks... As quota files are never truncated and quota code
3966 * itself serializes the operations (and noone else should touch the files)
3967 * we don't have to be afraid of races */
3968 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
3969 size_t len
, loff_t off
)
3971 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
3972 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
3974 int offset
= off
& (sb
->s_blocksize
- 1);
3977 struct buffer_head
*bh
;
3978 loff_t i_size
= i_size_read(inode
);
3982 if (off
+len
> i_size
)
3985 while (toread
> 0) {
3986 tocopy
= sb
->s_blocksize
- offset
< toread
?
3987 sb
->s_blocksize
- offset
: toread
;
3988 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
3991 if (!bh
) /* A hole? */
3992 memset(data
, 0, tocopy
);
3994 memcpy(data
, bh
->b_data
+offset
, tocopy
);
4004 /* Write to quotafile (we know the transaction is already started and has
4005 * enough credits) */
4006 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
4007 const char *data
, size_t len
, loff_t off
)
4009 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
4010 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
4012 int offset
= off
& (sb
->s_blocksize
- 1);
4013 int journal_quota
= EXT4_SB(sb
)->s_qf_names
[type
] != NULL
;
4014 struct buffer_head
*bh
;
4015 handle_t
*handle
= journal_current_handle();
4017 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
4018 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
4019 " cancelled because transaction is not started",
4020 (unsigned long long)off
, (unsigned long long)len
);
4024 * Since we account only one data block in transaction credits,
4025 * then it is impossible to cross a block boundary.
4027 if (sb
->s_blocksize
- offset
< len
) {
4028 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
4029 " cancelled because not block aligned",
4030 (unsigned long long)off
, (unsigned long long)len
);
4034 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
4035 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
4038 if (journal_quota
) {
4039 err
= ext4_journal_get_write_access(handle
, bh
);
4046 memcpy(bh
->b_data
+offset
, data
, len
);
4047 flush_dcache_page(bh
->b_page
);
4050 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
4052 /* Always do at least ordered writes for quotas */
4053 err
= ext4_jbd2_file_inode(handle
, inode
);
4054 mark_buffer_dirty(bh
);
4059 mutex_unlock(&inode
->i_mutex
);
4062 if (inode
->i_size
< off
+ len
) {
4063 i_size_write(inode
, off
+ len
);
4064 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
4066 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
4067 ext4_mark_inode_dirty(handle
, inode
);
4068 mutex_unlock(&inode
->i_mutex
);
4074 static int ext4_get_sb(struct file_system_type
*fs_type
, int flags
,
4075 const char *dev_name
, void *data
, struct vfsmount
*mnt
)
4077 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
,mnt
);
4080 #if !defined(CONTIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4081 static struct file_system_type ext2_fs_type
= {
4082 .owner
= THIS_MODULE
,
4084 .get_sb
= ext4_get_sb
,
4085 .kill_sb
= kill_block_super
,
4086 .fs_flags
= FS_REQUIRES_DEV
,
4089 static inline void register_as_ext2(void)
4091 int err
= register_filesystem(&ext2_fs_type
);
4094 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
4097 static inline void unregister_as_ext2(void)
4099 unregister_filesystem(&ext2_fs_type
);
4101 MODULE_ALIAS("ext2");
4103 static inline void register_as_ext2(void) { }
4104 static inline void unregister_as_ext2(void) { }
4107 #if !defined(CONTIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4108 static struct file_system_type ext3_fs_type
= {
4109 .owner
= THIS_MODULE
,
4111 .get_sb
= ext4_get_sb
,
4112 .kill_sb
= kill_block_super
,
4113 .fs_flags
= FS_REQUIRES_DEV
,
4116 static inline void register_as_ext3(void)
4118 int err
= register_filesystem(&ext3_fs_type
);
4121 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
4124 static inline void unregister_as_ext3(void)
4126 unregister_filesystem(&ext3_fs_type
);
4128 MODULE_ALIAS("ext3");
4130 static inline void register_as_ext3(void) { }
4131 static inline void unregister_as_ext3(void) { }
4134 static struct file_system_type ext4_fs_type
= {
4135 .owner
= THIS_MODULE
,
4137 .get_sb
= ext4_get_sb
,
4138 .kill_sb
= kill_block_super
,
4139 .fs_flags
= FS_REQUIRES_DEV
,
4142 static int __init
init_ext4_fs(void)
4146 err
= init_ext4_system_zone();
4149 ext4_kset
= kset_create_and_add("ext4", NULL
, fs_kobj
);
4152 ext4_proc_root
= proc_mkdir("fs/ext4", NULL
);
4153 err
= init_ext4_mballoc();
4157 err
= init_ext4_xattr();
4160 err
= init_inodecache();
4165 err
= register_filesystem(&ext4_fs_type
);
4170 unregister_as_ext2();
4171 unregister_as_ext3();
4172 destroy_inodecache();
4176 exit_ext4_mballoc();
4178 remove_proc_entry("fs/ext4", NULL
);
4179 kset_unregister(ext4_kset
);
4181 exit_ext4_system_zone();
4185 static void __exit
exit_ext4_fs(void)
4187 unregister_as_ext2();
4188 unregister_as_ext3();
4189 unregister_filesystem(&ext4_fs_type
);
4190 destroy_inodecache();
4192 exit_ext4_mballoc();
4193 remove_proc_entry("fs/ext4", NULL
);
4194 kset_unregister(ext4_kset
);
4195 exit_ext4_system_zone();
4198 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4199 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4200 MODULE_LICENSE("GPL");
4201 module_init(init_ext4_fs
)
4202 module_exit(exit_ext4_fs
)