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 complain 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
)
802 ext4_discard_preallocations(inode
);
803 if (EXT4_JOURNAL(inode
))
804 jbd2_journal_release_jbd_inode(EXT4_SB(inode
->i_sb
)->s_journal
,
805 &EXT4_I(inode
)->jinode
);
808 static inline void ext4_show_quota_options(struct seq_file
*seq
,
809 struct super_block
*sb
)
811 #if defined(CONFIG_QUOTA)
812 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
814 if (sbi
->s_jquota_fmt
) {
817 switch (sbi
->s_jquota_fmt
) {
828 seq_printf(seq
, ",jqfmt=%s", fmtname
);
831 if (sbi
->s_qf_names
[USRQUOTA
])
832 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
834 if (sbi
->s_qf_names
[GRPQUOTA
])
835 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
837 if (test_opt(sb
, USRQUOTA
))
838 seq_puts(seq
, ",usrquota");
840 if (test_opt(sb
, GRPQUOTA
))
841 seq_puts(seq
, ",grpquota");
847 * - it's set to a non-default value OR
848 * - if the per-sb default is different from the global default
850 static int ext4_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
853 unsigned long def_mount_opts
;
854 struct super_block
*sb
= vfs
->mnt_sb
;
855 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
856 struct ext4_super_block
*es
= sbi
->s_es
;
858 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
859 def_errors
= le16_to_cpu(es
->s_errors
);
861 if (sbi
->s_sb_block
!= 1)
862 seq_printf(seq
, ",sb=%llu", sbi
->s_sb_block
);
863 if (test_opt(sb
, MINIX_DF
))
864 seq_puts(seq
, ",minixdf");
865 if (test_opt(sb
, GRPID
) && !(def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
866 seq_puts(seq
, ",grpid");
867 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
868 seq_puts(seq
, ",nogrpid");
869 if (sbi
->s_resuid
!= EXT4_DEF_RESUID
||
870 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
) {
871 seq_printf(seq
, ",resuid=%u", sbi
->s_resuid
);
873 if (sbi
->s_resgid
!= EXT4_DEF_RESGID
||
874 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
) {
875 seq_printf(seq
, ",resgid=%u", sbi
->s_resgid
);
877 if (test_opt(sb
, ERRORS_RO
)) {
878 if (def_errors
== EXT4_ERRORS_PANIC
||
879 def_errors
== EXT4_ERRORS_CONTINUE
) {
880 seq_puts(seq
, ",errors=remount-ro");
883 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
884 seq_puts(seq
, ",errors=continue");
885 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
886 seq_puts(seq
, ",errors=panic");
887 if (test_opt(sb
, NO_UID32
) && !(def_mount_opts
& EXT4_DEFM_UID16
))
888 seq_puts(seq
, ",nouid32");
889 if (test_opt(sb
, DEBUG
) && !(def_mount_opts
& EXT4_DEFM_DEBUG
))
890 seq_puts(seq
, ",debug");
891 if (test_opt(sb
, OLDALLOC
))
892 seq_puts(seq
, ",oldalloc");
893 #ifdef CONFIG_EXT4_FS_XATTR
894 if (test_opt(sb
, XATTR_USER
) &&
895 !(def_mount_opts
& EXT4_DEFM_XATTR_USER
))
896 seq_puts(seq
, ",user_xattr");
897 if (!test_opt(sb
, XATTR_USER
) &&
898 (def_mount_opts
& EXT4_DEFM_XATTR_USER
)) {
899 seq_puts(seq
, ",nouser_xattr");
902 #ifdef CONFIG_EXT4_FS_POSIX_ACL
903 if (test_opt(sb
, POSIX_ACL
) && !(def_mount_opts
& EXT4_DEFM_ACL
))
904 seq_puts(seq
, ",acl");
905 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT4_DEFM_ACL
))
906 seq_puts(seq
, ",noacl");
908 if (sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
) {
909 seq_printf(seq
, ",commit=%u",
910 (unsigned) (sbi
->s_commit_interval
/ HZ
));
912 if (sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
) {
913 seq_printf(seq
, ",min_batch_time=%u",
914 (unsigned) sbi
->s_min_batch_time
);
916 if (sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
) {
917 seq_printf(seq
, ",max_batch_time=%u",
918 (unsigned) sbi
->s_min_batch_time
);
922 * We're changing the default of barrier mount option, so
923 * let's always display its mount state so it's clear what its
926 seq_puts(seq
, ",barrier=");
927 seq_puts(seq
, test_opt(sb
, BARRIER
) ? "1" : "0");
928 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
))
929 seq_puts(seq
, ",journal_async_commit");
930 if (test_opt(sb
, NOBH
))
931 seq_puts(seq
, ",nobh");
932 if (test_opt(sb
, I_VERSION
))
933 seq_puts(seq
, ",i_version");
934 if (!test_opt(sb
, DELALLOC
))
935 seq_puts(seq
, ",nodelalloc");
939 seq_printf(seq
, ",stripe=%lu", sbi
->s_stripe
);
941 * journal mode get enabled in different ways
942 * So just print the value even if we didn't specify it
944 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
945 seq_puts(seq
, ",data=journal");
946 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
947 seq_puts(seq
, ",data=ordered");
948 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
949 seq_puts(seq
, ",data=writeback");
951 if (sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
952 seq_printf(seq
, ",inode_readahead_blks=%u",
953 sbi
->s_inode_readahead_blks
);
955 if (test_opt(sb
, DATA_ERR_ABORT
))
956 seq_puts(seq
, ",data_err=abort");
958 if (test_opt(sb
, NO_AUTO_DA_ALLOC
))
959 seq_puts(seq
, ",noauto_da_alloc");
961 if (test_opt(sb
, DISCARD
))
962 seq_puts(seq
, ",discard");
964 if (test_opt(sb
, NOLOAD
))
965 seq_puts(seq
, ",norecovery");
967 if (test_opt(sb
, DIOREAD_NOLOCK
))
968 seq_puts(seq
, ",dioread_nolock");
970 ext4_show_quota_options(seq
, sb
);
975 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
976 u64 ino
, u32 generation
)
980 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
981 return ERR_PTR(-ESTALE
);
982 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
983 return ERR_PTR(-ESTALE
);
985 /* iget isn't really right if the inode is currently unallocated!!
987 * ext4_read_inode will return a bad_inode if the inode had been
988 * deleted, so we should be safe.
990 * Currently we don't know the generation for parent directory, so
991 * a generation of 0 means "accept any"
993 inode
= ext4_iget(sb
, ino
);
995 return ERR_CAST(inode
);
996 if (generation
&& inode
->i_generation
!= generation
) {
998 return ERR_PTR(-ESTALE
);
1004 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
1005 int fh_len
, int fh_type
)
1007 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
1008 ext4_nfs_get_inode
);
1011 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
1012 int fh_len
, int fh_type
)
1014 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
1015 ext4_nfs_get_inode
);
1019 * Try to release metadata pages (indirect blocks, directories) which are
1020 * mapped via the block device. Since these pages could have journal heads
1021 * which would prevent try_to_free_buffers() from freeing them, we must use
1022 * jbd2 layer's try_to_free_buffers() function to release them.
1024 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
1027 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
1029 WARN_ON(PageChecked(page
));
1030 if (!page_has_buffers(page
))
1033 return jbd2_journal_try_to_free_buffers(journal
, page
,
1034 wait
& ~__GFP_WAIT
);
1035 return try_to_free_buffers(page
);
1039 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1040 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1042 static int ext4_write_dquot(struct dquot
*dquot
);
1043 static int ext4_acquire_dquot(struct dquot
*dquot
);
1044 static int ext4_release_dquot(struct dquot
*dquot
);
1045 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1046 static int ext4_write_info(struct super_block
*sb
, int type
);
1047 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1048 char *path
, int remount
);
1049 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1050 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1051 size_t len
, loff_t off
);
1052 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1053 const char *data
, size_t len
, loff_t off
);
1055 static const struct dquot_operations ext4_quota_operations
= {
1057 .get_reserved_space
= ext4_get_reserved_space
,
1059 .write_dquot
= ext4_write_dquot
,
1060 .acquire_dquot
= ext4_acquire_dquot
,
1061 .release_dquot
= ext4_release_dquot
,
1062 .mark_dirty
= ext4_mark_dquot_dirty
,
1063 .write_info
= ext4_write_info
,
1064 .alloc_dquot
= dquot_alloc
,
1065 .destroy_dquot
= dquot_destroy
,
1068 static const struct quotactl_ops ext4_qctl_operations
= {
1069 .quota_on
= ext4_quota_on
,
1070 .quota_off
= vfs_quota_off
,
1071 .quota_sync
= vfs_quota_sync
,
1072 .get_info
= vfs_get_dqinfo
,
1073 .set_info
= vfs_set_dqinfo
,
1074 .get_dqblk
= vfs_get_dqblk
,
1075 .set_dqblk
= vfs_set_dqblk
1079 static const struct super_operations ext4_sops
= {
1080 .alloc_inode
= ext4_alloc_inode
,
1081 .destroy_inode
= ext4_destroy_inode
,
1082 .write_inode
= ext4_write_inode
,
1083 .dirty_inode
= ext4_dirty_inode
,
1084 .delete_inode
= ext4_delete_inode
,
1085 .put_super
= ext4_put_super
,
1086 .sync_fs
= ext4_sync_fs
,
1087 .freeze_fs
= ext4_freeze
,
1088 .unfreeze_fs
= ext4_unfreeze
,
1089 .statfs
= ext4_statfs
,
1090 .remount_fs
= ext4_remount
,
1091 .clear_inode
= ext4_clear_inode
,
1092 .show_options
= ext4_show_options
,
1094 .quota_read
= ext4_quota_read
,
1095 .quota_write
= ext4_quota_write
,
1097 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1100 static const struct super_operations ext4_nojournal_sops
= {
1101 .alloc_inode
= ext4_alloc_inode
,
1102 .destroy_inode
= ext4_destroy_inode
,
1103 .write_inode
= ext4_write_inode
,
1104 .dirty_inode
= ext4_dirty_inode
,
1105 .delete_inode
= ext4_delete_inode
,
1106 .write_super
= ext4_write_super
,
1107 .put_super
= ext4_put_super
,
1108 .statfs
= ext4_statfs
,
1109 .remount_fs
= ext4_remount
,
1110 .clear_inode
= ext4_clear_inode
,
1111 .show_options
= ext4_show_options
,
1113 .quota_read
= ext4_quota_read
,
1114 .quota_write
= ext4_quota_write
,
1116 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1119 static const struct export_operations ext4_export_ops
= {
1120 .fh_to_dentry
= ext4_fh_to_dentry
,
1121 .fh_to_parent
= ext4_fh_to_parent
,
1122 .get_parent
= ext4_get_parent
,
1126 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1127 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1128 Opt_nouid32
, Opt_debug
, Opt_oldalloc
, Opt_orlov
,
1129 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1130 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
, Opt_nobh
, Opt_bh
,
1131 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
,
1132 Opt_journal_update
, Opt_journal_dev
,
1133 Opt_journal_checksum
, Opt_journal_async_commit
,
1134 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1135 Opt_data_err_abort
, Opt_data_err_ignore
,
1136 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1137 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1138 Opt_noquota
, Opt_ignore
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1139 Opt_resize
, Opt_usrquota
, Opt_grpquota
, Opt_i_version
,
1140 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
,
1141 Opt_block_validity
, Opt_noblock_validity
,
1142 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1143 Opt_dioread_nolock
, Opt_dioread_lock
,
1144 Opt_discard
, Opt_nodiscard
,
1147 static const match_table_t tokens
= {
1148 {Opt_bsd_df
, "bsddf"},
1149 {Opt_minix_df
, "minixdf"},
1150 {Opt_grpid
, "grpid"},
1151 {Opt_grpid
, "bsdgroups"},
1152 {Opt_nogrpid
, "nogrpid"},
1153 {Opt_nogrpid
, "sysvgroups"},
1154 {Opt_resgid
, "resgid=%u"},
1155 {Opt_resuid
, "resuid=%u"},
1157 {Opt_err_cont
, "errors=continue"},
1158 {Opt_err_panic
, "errors=panic"},
1159 {Opt_err_ro
, "errors=remount-ro"},
1160 {Opt_nouid32
, "nouid32"},
1161 {Opt_debug
, "debug"},
1162 {Opt_oldalloc
, "oldalloc"},
1163 {Opt_orlov
, "orlov"},
1164 {Opt_user_xattr
, "user_xattr"},
1165 {Opt_nouser_xattr
, "nouser_xattr"},
1167 {Opt_noacl
, "noacl"},
1168 {Opt_noload
, "noload"},
1169 {Opt_noload
, "norecovery"},
1172 {Opt_commit
, "commit=%u"},
1173 {Opt_min_batch_time
, "min_batch_time=%u"},
1174 {Opt_max_batch_time
, "max_batch_time=%u"},
1175 {Opt_journal_update
, "journal=update"},
1176 {Opt_journal_dev
, "journal_dev=%u"},
1177 {Opt_journal_checksum
, "journal_checksum"},
1178 {Opt_journal_async_commit
, "journal_async_commit"},
1179 {Opt_abort
, "abort"},
1180 {Opt_data_journal
, "data=journal"},
1181 {Opt_data_ordered
, "data=ordered"},
1182 {Opt_data_writeback
, "data=writeback"},
1183 {Opt_data_err_abort
, "data_err=abort"},
1184 {Opt_data_err_ignore
, "data_err=ignore"},
1185 {Opt_offusrjquota
, "usrjquota="},
1186 {Opt_usrjquota
, "usrjquota=%s"},
1187 {Opt_offgrpjquota
, "grpjquota="},
1188 {Opt_grpjquota
, "grpjquota=%s"},
1189 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1190 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1191 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1192 {Opt_grpquota
, "grpquota"},
1193 {Opt_noquota
, "noquota"},
1194 {Opt_quota
, "quota"},
1195 {Opt_usrquota
, "usrquota"},
1196 {Opt_barrier
, "barrier=%u"},
1197 {Opt_barrier
, "barrier"},
1198 {Opt_nobarrier
, "nobarrier"},
1199 {Opt_i_version
, "i_version"},
1200 {Opt_stripe
, "stripe=%u"},
1201 {Opt_resize
, "resize"},
1202 {Opt_delalloc
, "delalloc"},
1203 {Opt_nodelalloc
, "nodelalloc"},
1204 {Opt_block_validity
, "block_validity"},
1205 {Opt_noblock_validity
, "noblock_validity"},
1206 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1207 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1208 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1209 {Opt_auto_da_alloc
, "auto_da_alloc"},
1210 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1211 {Opt_dioread_nolock
, "dioread_nolock"},
1212 {Opt_dioread_lock
, "dioread_lock"},
1213 {Opt_discard
, "discard"},
1214 {Opt_nodiscard
, "nodiscard"},
1218 static ext4_fsblk_t
get_sb_block(void **data
)
1220 ext4_fsblk_t sb_block
;
1221 char *options
= (char *) *data
;
1223 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1224 return 1; /* Default location */
1227 /* TODO: use simple_strtoll with >32bit ext4 */
1228 sb_block
= simple_strtoul(options
, &options
, 0);
1229 if (*options
&& *options
!= ',') {
1230 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1234 if (*options
== ',')
1236 *data
= (void *) options
;
1241 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1242 static char deprecated_msg
[] = "Mount option \"%s\" will be removed by %s\n"
1243 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1246 static int set_qf_name(struct super_block
*sb
, int qtype
, substring_t
*args
)
1248 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1251 if (sb_any_quota_loaded(sb
) &&
1252 !sbi
->s_qf_names
[qtype
]) {
1253 ext4_msg(sb
, KERN_ERR
,
1254 "Cannot change journaled "
1255 "quota options when quota turned on");
1258 qname
= match_strdup(args
);
1260 ext4_msg(sb
, KERN_ERR
,
1261 "Not enough memory for storing quotafile name");
1264 if (sbi
->s_qf_names
[qtype
] &&
1265 strcmp(sbi
->s_qf_names
[qtype
], qname
)) {
1266 ext4_msg(sb
, KERN_ERR
,
1267 "%s quota file already specified", QTYPE2NAME(qtype
));
1271 sbi
->s_qf_names
[qtype
] = qname
;
1272 if (strchr(sbi
->s_qf_names
[qtype
], '/')) {
1273 ext4_msg(sb
, KERN_ERR
,
1274 "quotafile must be on filesystem root");
1275 kfree(sbi
->s_qf_names
[qtype
]);
1276 sbi
->s_qf_names
[qtype
] = NULL
;
1279 set_opt(sbi
->s_mount_opt
, QUOTA
);
1283 static int clear_qf_name(struct super_block
*sb
, int qtype
)
1286 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1288 if (sb_any_quota_loaded(sb
) &&
1289 sbi
->s_qf_names
[qtype
]) {
1290 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled quota options"
1291 " when quota turned on");
1295 * The space will be released later when all options are confirmed
1298 sbi
->s_qf_names
[qtype
] = NULL
;
1303 static int parse_options(char *options
, struct super_block
*sb
,
1304 unsigned long *journal_devnum
,
1305 unsigned int *journal_ioprio
,
1306 ext4_fsblk_t
*n_blocks_count
, int is_remount
)
1308 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1310 substring_t args
[MAX_OPT_ARGS
];
1320 while ((p
= strsep(&options
, ",")) != NULL
) {
1326 * Initialize args struct so we know whether arg was
1327 * found; some options take optional arguments.
1329 args
[0].to
= args
[0].from
= 0;
1330 token
= match_token(p
, tokens
, args
);
1333 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1334 clear_opt(sbi
->s_mount_opt
, MINIX_DF
);
1337 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1338 set_opt(sbi
->s_mount_opt
, MINIX_DF
);
1342 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1343 set_opt(sbi
->s_mount_opt
, GRPID
);
1347 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1348 clear_opt(sbi
->s_mount_opt
, GRPID
);
1352 if (match_int(&args
[0], &option
))
1354 sbi
->s_resuid
= option
;
1357 if (match_int(&args
[0], &option
))
1359 sbi
->s_resgid
= option
;
1362 /* handled by get_sb_block() instead of here */
1363 /* *sb_block = match_int(&args[0]); */
1366 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1367 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1368 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1371 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1372 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1373 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1376 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1377 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1378 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1381 set_opt(sbi
->s_mount_opt
, NO_UID32
);
1384 set_opt(sbi
->s_mount_opt
, DEBUG
);
1387 set_opt(sbi
->s_mount_opt
, OLDALLOC
);
1390 clear_opt(sbi
->s_mount_opt
, OLDALLOC
);
1392 #ifdef CONFIG_EXT4_FS_XATTR
1393 case Opt_user_xattr
:
1394 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
1396 case Opt_nouser_xattr
:
1397 clear_opt(sbi
->s_mount_opt
, XATTR_USER
);
1400 case Opt_user_xattr
:
1401 case Opt_nouser_xattr
:
1402 ext4_msg(sb
, KERN_ERR
, "(no)user_xattr options not supported");
1405 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1407 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1410 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1415 ext4_msg(sb
, KERN_ERR
, "(no)acl options not supported");
1418 case Opt_journal_update
:
1420 /* Eventually we will want to be able to create
1421 a journal file here. For now, only allow the
1422 user to specify an existing inode to be the
1425 ext4_msg(sb
, KERN_ERR
,
1426 "Cannot specify journal on remount");
1429 set_opt(sbi
->s_mount_opt
, UPDATE_JOURNAL
);
1431 case Opt_journal_dev
:
1433 ext4_msg(sb
, KERN_ERR
,
1434 "Cannot specify journal on remount");
1437 if (match_int(&args
[0], &option
))
1439 *journal_devnum
= option
;
1441 case Opt_journal_checksum
:
1442 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1444 case Opt_journal_async_commit
:
1445 set_opt(sbi
->s_mount_opt
, JOURNAL_ASYNC_COMMIT
);
1446 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1449 set_opt(sbi
->s_mount_opt
, NOLOAD
);
1452 if (match_int(&args
[0], &option
))
1457 option
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1458 sbi
->s_commit_interval
= HZ
* option
;
1460 case Opt_max_batch_time
:
1461 if (match_int(&args
[0], &option
))
1466 option
= EXT4_DEF_MAX_BATCH_TIME
;
1467 sbi
->s_max_batch_time
= option
;
1469 case Opt_min_batch_time
:
1470 if (match_int(&args
[0], &option
))
1474 sbi
->s_min_batch_time
= option
;
1476 case Opt_data_journal
:
1477 data_opt
= EXT4_MOUNT_JOURNAL_DATA
;
1479 case Opt_data_ordered
:
1480 data_opt
= EXT4_MOUNT_ORDERED_DATA
;
1482 case Opt_data_writeback
:
1483 data_opt
= EXT4_MOUNT_WRITEBACK_DATA
;
1486 if (test_opt(sb
, DATA_FLAGS
) != data_opt
) {
1487 ext4_msg(sb
, KERN_ERR
,
1488 "Cannot change data mode on remount");
1492 clear_opt(sbi
->s_mount_opt
, DATA_FLAGS
);
1493 sbi
->s_mount_opt
|= data_opt
;
1496 case Opt_data_err_abort
:
1497 set_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1499 case Opt_data_err_ignore
:
1500 clear_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1504 if (!set_qf_name(sb
, USRQUOTA
, &args
[0]))
1508 if (!set_qf_name(sb
, GRPQUOTA
, &args
[0]))
1511 case Opt_offusrjquota
:
1512 if (!clear_qf_name(sb
, USRQUOTA
))
1515 case Opt_offgrpjquota
:
1516 if (!clear_qf_name(sb
, GRPQUOTA
))
1520 case Opt_jqfmt_vfsold
:
1521 qfmt
= QFMT_VFS_OLD
;
1523 case Opt_jqfmt_vfsv0
:
1526 case Opt_jqfmt_vfsv1
:
1529 if (sb_any_quota_loaded(sb
) &&
1530 sbi
->s_jquota_fmt
!= qfmt
) {
1531 ext4_msg(sb
, KERN_ERR
, "Cannot change "
1532 "journaled quota options when "
1536 sbi
->s_jquota_fmt
= qfmt
;
1540 set_opt(sbi
->s_mount_opt
, QUOTA
);
1541 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
1544 set_opt(sbi
->s_mount_opt
, QUOTA
);
1545 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1548 if (sb_any_quota_loaded(sb
)) {
1549 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1550 "options when quota turned on");
1553 clear_opt(sbi
->s_mount_opt
, QUOTA
);
1554 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1555 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1561 ext4_msg(sb
, KERN_ERR
,
1562 "quota options not supported");
1566 case Opt_offusrjquota
:
1567 case Opt_offgrpjquota
:
1568 case Opt_jqfmt_vfsold
:
1569 case Opt_jqfmt_vfsv0
:
1570 case Opt_jqfmt_vfsv1
:
1571 ext4_msg(sb
, KERN_ERR
,
1572 "journaled quota options not supported");
1578 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1581 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1585 if (match_int(&args
[0], &option
))
1588 option
= 1; /* No argument, default to 1 */
1590 set_opt(sbi
->s_mount_opt
, BARRIER
);
1592 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1598 ext4_msg(sb
, KERN_ERR
,
1599 "resize option only available "
1603 if (match_int(&args
[0], &option
) != 0)
1605 *n_blocks_count
= option
;
1608 set_opt(sbi
->s_mount_opt
, NOBH
);
1611 clear_opt(sbi
->s_mount_opt
, NOBH
);
1614 set_opt(sbi
->s_mount_opt
, I_VERSION
);
1615 sb
->s_flags
|= MS_I_VERSION
;
1617 case Opt_nodelalloc
:
1618 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
1621 if (match_int(&args
[0], &option
))
1625 sbi
->s_stripe
= option
;
1628 set_opt(sbi
->s_mount_opt
, DELALLOC
);
1630 case Opt_block_validity
:
1631 set_opt(sbi
->s_mount_opt
, BLOCK_VALIDITY
);
1633 case Opt_noblock_validity
:
1634 clear_opt(sbi
->s_mount_opt
, BLOCK_VALIDITY
);
1636 case Opt_inode_readahead_blks
:
1637 if (match_int(&args
[0], &option
))
1639 if (option
< 0 || option
> (1 << 30))
1641 if (!is_power_of_2(option
)) {
1642 ext4_msg(sb
, KERN_ERR
,
1643 "EXT4-fs: inode_readahead_blks"
1644 " must be a power of 2");
1647 sbi
->s_inode_readahead_blks
= option
;
1649 case Opt_journal_ioprio
:
1650 if (match_int(&args
[0], &option
))
1652 if (option
< 0 || option
> 7)
1654 *journal_ioprio
= IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
,
1657 case Opt_noauto_da_alloc
:
1658 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1660 case Opt_auto_da_alloc
:
1662 if (match_int(&args
[0], &option
))
1665 option
= 1; /* No argument, default to 1 */
1667 clear_opt(sbi
->s_mount_opt
, NO_AUTO_DA_ALLOC
);
1669 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1672 set_opt(sbi
->s_mount_opt
, DISCARD
);
1675 clear_opt(sbi
->s_mount_opt
, DISCARD
);
1677 case Opt_dioread_nolock
:
1678 set_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
1680 case Opt_dioread_lock
:
1681 clear_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
1684 ext4_msg(sb
, KERN_ERR
,
1685 "Unrecognized mount option \"%s\" "
1686 "or missing value", p
);
1691 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1692 if (test_opt(sb
, USRQUOTA
) && sbi
->s_qf_names
[USRQUOTA
])
1693 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1695 if (test_opt(sb
, GRPQUOTA
) && sbi
->s_qf_names
[GRPQUOTA
])
1696 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1698 if (test_opt(sb
, GRPQUOTA
) || test_opt(sb
, USRQUOTA
)) {
1699 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1704 if (!sbi
->s_jquota_fmt
) {
1705 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1710 if (sbi
->s_jquota_fmt
) {
1711 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1712 "specified with no journaling "
1721 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1724 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1727 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1728 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
1729 "forcing read-only mode");
1734 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1735 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
1736 "running e2fsck is recommended");
1737 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1738 ext4_msg(sb
, KERN_WARNING
,
1739 "warning: mounting fs with errors, "
1740 "running e2fsck is recommended");
1741 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
1742 le16_to_cpu(es
->s_mnt_count
) >=
1743 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1744 ext4_msg(sb
, KERN_WARNING
,
1745 "warning: maximal mount count reached, "
1746 "running e2fsck is recommended");
1747 else if (le32_to_cpu(es
->s_checkinterval
) &&
1748 (le32_to_cpu(es
->s_lastcheck
) +
1749 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1750 ext4_msg(sb
, KERN_WARNING
,
1751 "warning: checktime reached, "
1752 "running e2fsck is recommended");
1753 if (!sbi
->s_journal
)
1754 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1755 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1756 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1757 le16_add_cpu(&es
->s_mnt_count
, 1);
1758 es
->s_mtime
= cpu_to_le32(get_seconds());
1759 ext4_update_dynamic_rev(sb
);
1761 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1763 ext4_commit_super(sb
, 1);
1764 if (test_opt(sb
, DEBUG
))
1765 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
1766 "bpg=%lu, ipg=%lu, mo=%04x]\n",
1768 sbi
->s_groups_count
,
1769 EXT4_BLOCKS_PER_GROUP(sb
),
1770 EXT4_INODES_PER_GROUP(sb
),
1776 static int ext4_fill_flex_info(struct super_block
*sb
)
1778 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1779 struct ext4_group_desc
*gdp
= NULL
;
1780 ext4_group_t flex_group_count
;
1781 ext4_group_t flex_group
;
1782 int groups_per_flex
= 0;
1786 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1787 groups_per_flex
= 1 << sbi
->s_log_groups_per_flex
;
1789 if (groups_per_flex
< 2) {
1790 sbi
->s_log_groups_per_flex
= 0;
1794 /* We allocate both existing and potentially added groups */
1795 flex_group_count
= ((sbi
->s_groups_count
+ groups_per_flex
- 1) +
1796 ((le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
) + 1) <<
1797 EXT4_DESC_PER_BLOCK_BITS(sb
))) / groups_per_flex
;
1798 size
= flex_group_count
* sizeof(struct flex_groups
);
1799 sbi
->s_flex_groups
= kzalloc(size
, GFP_KERNEL
);
1800 if (sbi
->s_flex_groups
== NULL
) {
1801 sbi
->s_flex_groups
= vmalloc(size
);
1802 if (sbi
->s_flex_groups
)
1803 memset(sbi
->s_flex_groups
, 0, size
);
1805 if (sbi
->s_flex_groups
== NULL
) {
1806 ext4_msg(sb
, KERN_ERR
, "not enough memory for "
1807 "%u flex groups", flex_group_count
);
1811 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1812 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1814 flex_group
= ext4_flex_group(sbi
, i
);
1815 atomic_add(ext4_free_inodes_count(sb
, gdp
),
1816 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
1817 atomic_add(ext4_free_blks_count(sb
, gdp
),
1818 &sbi
->s_flex_groups
[flex_group
].free_blocks
);
1819 atomic_add(ext4_used_dirs_count(sb
, gdp
),
1820 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
1828 __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
1829 struct ext4_group_desc
*gdp
)
1833 if (sbi
->s_es
->s_feature_ro_compat
&
1834 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) {
1835 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
1836 __le32 le_group
= cpu_to_le32(block_group
);
1838 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
1839 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
1840 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
1841 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
1842 /* for checksum of struct ext4_group_desc do the rest...*/
1843 if ((sbi
->s_es
->s_feature_incompat
&
1844 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
1845 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
1846 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
1847 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
1851 return cpu_to_le16(crc
);
1854 int ext4_group_desc_csum_verify(struct ext4_sb_info
*sbi
, __u32 block_group
,
1855 struct ext4_group_desc
*gdp
)
1857 if ((sbi
->s_es
->s_feature_ro_compat
&
1858 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) &&
1859 (gdp
->bg_checksum
!= ext4_group_desc_csum(sbi
, block_group
, gdp
)))
1865 /* Called at mount-time, super-block is locked */
1866 static int ext4_check_descriptors(struct super_block
*sb
)
1868 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1869 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
1870 ext4_fsblk_t last_block
;
1871 ext4_fsblk_t block_bitmap
;
1872 ext4_fsblk_t inode_bitmap
;
1873 ext4_fsblk_t inode_table
;
1874 int flexbg_flag
= 0;
1877 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
1880 ext4_debug("Checking group descriptors");
1882 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1883 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1885 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
1886 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
1888 last_block
= first_block
+
1889 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
1891 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
1892 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
1893 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1894 "Block bitmap for group %u not in group "
1895 "(block %llu)!", i
, block_bitmap
);
1898 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
1899 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
1900 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1901 "Inode bitmap for group %u not in group "
1902 "(block %llu)!", i
, inode_bitmap
);
1905 inode_table
= ext4_inode_table(sb
, gdp
);
1906 if (inode_table
< first_block
||
1907 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
1908 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1909 "Inode table for group %u not in group "
1910 "(block %llu)!", i
, inode_table
);
1913 ext4_lock_group(sb
, i
);
1914 if (!ext4_group_desc_csum_verify(sbi
, i
, gdp
)) {
1915 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1916 "Checksum for group %u failed (%u!=%u)",
1917 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
1918 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
1919 if (!(sb
->s_flags
& MS_RDONLY
)) {
1920 ext4_unlock_group(sb
, i
);
1924 ext4_unlock_group(sb
, i
);
1926 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
1929 ext4_free_blocks_count_set(sbi
->s_es
, ext4_count_free_blocks(sb
));
1930 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
1934 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1935 * the superblock) which were deleted from all directories, but held open by
1936 * a process at the time of a crash. We walk the list and try to delete these
1937 * inodes at recovery time (only with a read-write filesystem).
1939 * In order to keep the orphan inode chain consistent during traversal (in
1940 * case of crash during recovery), we link each inode into the superblock
1941 * orphan list_head and handle it the same way as an inode deletion during
1942 * normal operation (which journals the operations for us).
1944 * We only do an iget() and an iput() on each inode, which is very safe if we
1945 * accidentally point at an in-use or already deleted inode. The worst that
1946 * can happen in this case is that we get a "bit already cleared" message from
1947 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1948 * e2fsck was run on this filesystem, and it must have already done the orphan
1949 * inode cleanup for us, so we can safely abort without any further action.
1951 static void ext4_orphan_cleanup(struct super_block
*sb
,
1952 struct ext4_super_block
*es
)
1954 unsigned int s_flags
= sb
->s_flags
;
1955 int nr_orphans
= 0, nr_truncates
= 0;
1959 if (!es
->s_last_orphan
) {
1960 jbd_debug(4, "no orphan inodes to clean up\n");
1964 if (bdev_read_only(sb
->s_bdev
)) {
1965 ext4_msg(sb
, KERN_ERR
, "write access "
1966 "unavailable, skipping orphan cleanup");
1970 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
1971 if (es
->s_last_orphan
)
1972 jbd_debug(1, "Errors on filesystem, "
1973 "clearing orphan list.\n");
1974 es
->s_last_orphan
= 0;
1975 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1979 if (s_flags
& MS_RDONLY
) {
1980 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
1981 sb
->s_flags
&= ~MS_RDONLY
;
1984 /* Needed for iput() to work correctly and not trash data */
1985 sb
->s_flags
|= MS_ACTIVE
;
1986 /* Turn on quotas so that they are updated correctly */
1987 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1988 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
1989 int ret
= ext4_quota_on_mount(sb
, i
);
1991 ext4_msg(sb
, KERN_ERR
,
1992 "Cannot turn on journaled "
1993 "quota: error %d", ret
);
1998 while (es
->s_last_orphan
) {
1999 struct inode
*inode
;
2001 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
2002 if (IS_ERR(inode
)) {
2003 es
->s_last_orphan
= 0;
2007 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
2008 dquot_initialize(inode
);
2009 if (inode
->i_nlink
) {
2010 ext4_msg(sb
, KERN_DEBUG
,
2011 "%s: truncating inode %lu to %lld bytes",
2012 __func__
, inode
->i_ino
, inode
->i_size
);
2013 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2014 inode
->i_ino
, inode
->i_size
);
2015 ext4_truncate(inode
);
2018 ext4_msg(sb
, KERN_DEBUG
,
2019 "%s: deleting unreferenced inode %lu",
2020 __func__
, inode
->i_ino
);
2021 jbd_debug(2, "deleting unreferenced inode %lu\n",
2025 iput(inode
); /* The delete magic happens here! */
2028 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2031 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
2032 PLURAL(nr_orphans
));
2034 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
2035 PLURAL(nr_truncates
));
2037 /* Turn quotas off */
2038 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2039 if (sb_dqopt(sb
)->files
[i
])
2040 vfs_quota_off(sb
, i
, 0);
2043 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
2047 * Maximal extent format file size.
2048 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2049 * extent format containers, within a sector_t, and within i_blocks
2050 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2051 * so that won't be a limiting factor.
2053 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2055 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
2058 loff_t upper_limit
= MAX_LFS_FILESIZE
;
2060 /* small i_blocks in vfs inode? */
2061 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2063 * CONFIG_LBDAF is not enabled implies the inode
2064 * i_block represent total blocks in 512 bytes
2065 * 32 == size of vfs inode i_blocks * 8
2067 upper_limit
= (1LL << 32) - 1;
2069 /* total blocks in file system block size */
2070 upper_limit
>>= (blkbits
- 9);
2071 upper_limit
<<= blkbits
;
2074 /* 32-bit extent-start container, ee_block */
2079 /* Sanity check against vm- & vfs- imposed limits */
2080 if (res
> upper_limit
)
2087 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2088 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2089 * We need to be 1 filesystem block less than the 2^48 sector limit.
2091 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2093 loff_t res
= EXT4_NDIR_BLOCKS
;
2096 /* This is calculated to be the largest file size for a dense, block
2097 * mapped file such that the file's total number of 512-byte sectors,
2098 * including data and all indirect blocks, does not exceed (2^48 - 1).
2100 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2101 * number of 512-byte sectors of the file.
2104 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2106 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2107 * the inode i_block field represents total file blocks in
2108 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2110 upper_limit
= (1LL << 32) - 1;
2112 /* total blocks in file system block size */
2113 upper_limit
>>= (bits
- 9);
2117 * We use 48 bit ext4_inode i_blocks
2118 * With EXT4_HUGE_FILE_FL set the i_blocks
2119 * represent total number of blocks in
2120 * file system block size
2122 upper_limit
= (1LL << 48) - 1;
2126 /* indirect blocks */
2128 /* double indirect blocks */
2129 meta_blocks
+= 1 + (1LL << (bits
-2));
2130 /* tripple indirect blocks */
2131 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2133 upper_limit
-= meta_blocks
;
2134 upper_limit
<<= bits
;
2136 res
+= 1LL << (bits
-2);
2137 res
+= 1LL << (2*(bits
-2));
2138 res
+= 1LL << (3*(bits
-2));
2140 if (res
> upper_limit
)
2143 if (res
> MAX_LFS_FILESIZE
)
2144 res
= MAX_LFS_FILESIZE
;
2149 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2150 ext4_fsblk_t logical_sb_block
, int nr
)
2152 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2153 ext4_group_t bg
, first_meta_bg
;
2156 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2158 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
2160 return logical_sb_block
+ nr
+ 1;
2161 bg
= sbi
->s_desc_per_block
* nr
;
2162 if (ext4_bg_has_super(sb
, bg
))
2165 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2169 * ext4_get_stripe_size: Get the stripe size.
2170 * @sbi: In memory super block info
2172 * If we have specified it via mount option, then
2173 * use the mount option value. If the value specified at mount time is
2174 * greater than the blocks per group use the super block value.
2175 * If the super block value is greater than blocks per group return 0.
2176 * Allocator needs it be less than blocks per group.
2179 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2181 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2182 unsigned long stripe_width
=
2183 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2185 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2186 return sbi
->s_stripe
;
2188 if (stripe_width
<= sbi
->s_blocks_per_group
)
2189 return stripe_width
;
2191 if (stride
<= sbi
->s_blocks_per_group
)
2200 struct attribute attr
;
2201 ssize_t (*show
)(struct ext4_attr
*, struct ext4_sb_info
*, char *);
2202 ssize_t (*store
)(struct ext4_attr
*, struct ext4_sb_info
*,
2203 const char *, size_t);
2207 static int parse_strtoul(const char *buf
,
2208 unsigned long max
, unsigned long *value
)
2212 *value
= simple_strtoul(skip_spaces(buf
), &endp
, 0);
2213 endp
= skip_spaces(endp
);
2214 if (*endp
|| *value
> max
)
2220 static ssize_t
delayed_allocation_blocks_show(struct ext4_attr
*a
,
2221 struct ext4_sb_info
*sbi
,
2224 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2225 (s64
) percpu_counter_sum(&sbi
->s_dirtyblocks_counter
));
2228 static ssize_t
session_write_kbytes_show(struct ext4_attr
*a
,
2229 struct ext4_sb_info
*sbi
, char *buf
)
2231 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2233 return snprintf(buf
, PAGE_SIZE
, "%lu\n",
2234 (part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2235 sbi
->s_sectors_written_start
) >> 1);
2238 static ssize_t
lifetime_write_kbytes_show(struct ext4_attr
*a
,
2239 struct ext4_sb_info
*sbi
, char *buf
)
2241 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2243 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2244 (unsigned long long)(sbi
->s_kbytes_written
+
2245 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2246 EXT4_SB(sb
)->s_sectors_written_start
) >> 1)));
2249 static ssize_t
inode_readahead_blks_store(struct ext4_attr
*a
,
2250 struct ext4_sb_info
*sbi
,
2251 const char *buf
, size_t count
)
2255 if (parse_strtoul(buf
, 0x40000000, &t
))
2258 if (!is_power_of_2(t
))
2261 sbi
->s_inode_readahead_blks
= t
;
2265 static ssize_t
sbi_ui_show(struct ext4_attr
*a
,
2266 struct ext4_sb_info
*sbi
, char *buf
)
2268 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2270 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
2273 static ssize_t
sbi_ui_store(struct ext4_attr
*a
,
2274 struct ext4_sb_info
*sbi
,
2275 const char *buf
, size_t count
)
2277 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2280 if (parse_strtoul(buf
, 0xffffffff, &t
))
2286 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2287 static struct ext4_attr ext4_attr_##_name = { \
2288 .attr = {.name = __stringify(_name), .mode = _mode }, \
2291 .offset = offsetof(struct ext4_sb_info, _elname), \
2293 #define EXT4_ATTR(name, mode, show, store) \
2294 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2296 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2297 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2298 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2299 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2300 #define ATTR_LIST(name) &ext4_attr_##name.attr
2302 EXT4_RO_ATTR(delayed_allocation_blocks
);
2303 EXT4_RO_ATTR(session_write_kbytes
);
2304 EXT4_RO_ATTR(lifetime_write_kbytes
);
2305 EXT4_ATTR_OFFSET(inode_readahead_blks
, 0644, sbi_ui_show
,
2306 inode_readahead_blks_store
, s_inode_readahead_blks
);
2307 EXT4_RW_ATTR_SBI_UI(inode_goal
, s_inode_goal
);
2308 EXT4_RW_ATTR_SBI_UI(mb_stats
, s_mb_stats
);
2309 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan
, s_mb_max_to_scan
);
2310 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan
, s_mb_min_to_scan
);
2311 EXT4_RW_ATTR_SBI_UI(mb_order2_req
, s_mb_order2_reqs
);
2312 EXT4_RW_ATTR_SBI_UI(mb_stream_req
, s_mb_stream_request
);
2313 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc
, s_mb_group_prealloc
);
2314 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump
, s_max_writeback_mb_bump
);
2316 static struct attribute
*ext4_attrs
[] = {
2317 ATTR_LIST(delayed_allocation_blocks
),
2318 ATTR_LIST(session_write_kbytes
),
2319 ATTR_LIST(lifetime_write_kbytes
),
2320 ATTR_LIST(inode_readahead_blks
),
2321 ATTR_LIST(inode_goal
),
2322 ATTR_LIST(mb_stats
),
2323 ATTR_LIST(mb_max_to_scan
),
2324 ATTR_LIST(mb_min_to_scan
),
2325 ATTR_LIST(mb_order2_req
),
2326 ATTR_LIST(mb_stream_req
),
2327 ATTR_LIST(mb_group_prealloc
),
2328 ATTR_LIST(max_writeback_mb_bump
),
2332 static ssize_t
ext4_attr_show(struct kobject
*kobj
,
2333 struct attribute
*attr
, char *buf
)
2335 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2337 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2339 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
2342 static ssize_t
ext4_attr_store(struct kobject
*kobj
,
2343 struct attribute
*attr
,
2344 const char *buf
, size_t len
)
2346 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2348 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2350 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
2353 static void ext4_sb_release(struct kobject
*kobj
)
2355 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2357 complete(&sbi
->s_kobj_unregister
);
2361 static const struct sysfs_ops ext4_attr_ops
= {
2362 .show
= ext4_attr_show
,
2363 .store
= ext4_attr_store
,
2366 static struct kobj_type ext4_ktype
= {
2367 .default_attrs
= ext4_attrs
,
2368 .sysfs_ops
= &ext4_attr_ops
,
2369 .release
= ext4_sb_release
,
2373 * Check whether this filesystem can be mounted based on
2374 * the features present and the RDONLY/RDWR mount requested.
2375 * Returns 1 if this filesystem can be mounted as requested,
2376 * 0 if it cannot be.
2378 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2380 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
)) {
2381 ext4_msg(sb
, KERN_ERR
,
2382 "Couldn't mount because of "
2383 "unsupported optional features (%x)",
2384 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2385 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2392 /* Check that feature set is OK for a read-write mount */
2393 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
)) {
2394 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2395 "unsupported optional features (%x)",
2396 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2397 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2401 * Large file size enabled file system can only be mounted
2402 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2404 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
2405 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2406 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2407 "cannot be mounted RDWR without "
2415 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
2416 __releases(kernel_lock
)
2417 __acquires(kernel_lock
)
2419 struct buffer_head
*bh
;
2420 struct ext4_super_block
*es
= NULL
;
2421 struct ext4_sb_info
*sbi
;
2423 ext4_fsblk_t sb_block
= get_sb_block(&data
);
2424 ext4_fsblk_t logical_sb_block
;
2425 unsigned long offset
= 0;
2426 unsigned long journal_devnum
= 0;
2427 unsigned long def_mount_opts
;
2433 unsigned int db_count
;
2435 int needs_recovery
, has_huge_files
;
2438 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
2440 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
2444 sbi
->s_blockgroup_lock
=
2445 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
2446 if (!sbi
->s_blockgroup_lock
) {
2450 sb
->s_fs_info
= sbi
;
2451 sbi
->s_mount_opt
= 0;
2452 sbi
->s_resuid
= EXT4_DEF_RESUID
;
2453 sbi
->s_resgid
= EXT4_DEF_RESGID
;
2454 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
2455 sbi
->s_sb_block
= sb_block
;
2456 sbi
->s_sectors_written_start
= part_stat_read(sb
->s_bdev
->bd_part
,
2461 /* Cleanup superblock name */
2462 for (cp
= sb
->s_id
; (cp
= strchr(cp
, '/'));)
2465 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
2467 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
2472 * The ext4 superblock will not be buffer aligned for other than 1kB
2473 * block sizes. We need to calculate the offset from buffer start.
2475 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
2476 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2477 offset
= do_div(logical_sb_block
, blocksize
);
2479 logical_sb_block
= sb_block
;
2482 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
2483 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
2487 * Note: s_es must be initialized as soon as possible because
2488 * some ext4 macro-instructions depend on its value
2490 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
2492 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
2493 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
2495 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
2497 /* Set defaults before we parse the mount options */
2498 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
2499 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
2500 set_opt(sbi
->s_mount_opt
, DEBUG
);
2501 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
) {
2502 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, "bsdgroups",
2504 set_opt(sbi
->s_mount_opt
, GRPID
);
2506 if (def_mount_opts
& EXT4_DEFM_UID16
)
2507 set_opt(sbi
->s_mount_opt
, NO_UID32
);
2508 #ifdef CONFIG_EXT4_FS_XATTR
2509 if (def_mount_opts
& EXT4_DEFM_XATTR_USER
)
2510 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
2512 #ifdef CONFIG_EXT4_FS_POSIX_ACL
2513 if (def_mount_opts
& EXT4_DEFM_ACL
)
2514 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
2516 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
2517 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
2518 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
2519 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
2520 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
2521 set_opt(sbi
->s_mount_opt
, WRITEBACK_DATA
);
2523 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
2524 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
2525 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
2526 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
2528 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
2530 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
2531 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
2532 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
2533 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
2534 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
2536 set_opt(sbi
->s_mount_opt
, BARRIER
);
2539 * enable delayed allocation by default
2540 * Use -o nodelalloc to turn it off
2542 set_opt(sbi
->s_mount_opt
, DELALLOC
);
2544 if (!parse_options((char *) data
, sb
, &journal_devnum
,
2545 &journal_ioprio
, NULL
, 0))
2548 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
2549 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
2551 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
2552 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
2553 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
2554 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
2555 ext4_msg(sb
, KERN_WARNING
,
2556 "feature flags set on rev 0 fs, "
2557 "running e2fsck is recommended");
2560 * Check feature flags regardless of the revision level, since we
2561 * previously didn't change the revision level when setting the flags,
2562 * so there is a chance incompat flags are set on a rev 0 filesystem.
2564 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
2567 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
2569 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
2570 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
2571 ext4_msg(sb
, KERN_ERR
,
2572 "Unsupported filesystem blocksize %d", blocksize
);
2576 if (sb
->s_blocksize
!= blocksize
) {
2577 /* Validate the filesystem blocksize */
2578 if (!sb_set_blocksize(sb
, blocksize
)) {
2579 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
2585 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2586 offset
= do_div(logical_sb_block
, blocksize
);
2587 bh
= sb_bread(sb
, logical_sb_block
);
2589 ext4_msg(sb
, KERN_ERR
,
2590 "Can't read superblock on 2nd try");
2593 es
= (struct ext4_super_block
*)(((char *)bh
->b_data
) + offset
);
2595 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
2596 ext4_msg(sb
, KERN_ERR
,
2597 "Magic mismatch, very weird!");
2602 has_huge_files
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2603 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
);
2604 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
2606 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
2608 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
2609 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
2610 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
2612 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
2613 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
2614 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
2615 (!is_power_of_2(sbi
->s_inode_size
)) ||
2616 (sbi
->s_inode_size
> blocksize
)) {
2617 ext4_msg(sb
, KERN_ERR
,
2618 "unsupported inode size: %d",
2622 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
2623 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
2626 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
2627 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
2628 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
2629 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
2630 !is_power_of_2(sbi
->s_desc_size
)) {
2631 ext4_msg(sb
, KERN_ERR
,
2632 "unsupported descriptor size %lu",
2637 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
2639 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
2640 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
2641 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
2644 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
2645 if (sbi
->s_inodes_per_block
== 0)
2647 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
2648 sbi
->s_inodes_per_block
;
2649 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
2651 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
2652 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
2653 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
2655 for (i
= 0; i
< 4; i
++)
2656 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
2657 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
2658 i
= le32_to_cpu(es
->s_flags
);
2659 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
2660 sbi
->s_hash_unsigned
= 3;
2661 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
2662 #ifdef __CHAR_UNSIGNED__
2663 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
2664 sbi
->s_hash_unsigned
= 3;
2666 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
2671 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
2672 ext4_msg(sb
, KERN_ERR
,
2673 "#blocks per group too big: %lu",
2674 sbi
->s_blocks_per_group
);
2677 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
2678 ext4_msg(sb
, KERN_ERR
,
2679 "#inodes per group too big: %lu",
2680 sbi
->s_inodes_per_group
);
2685 * Test whether we have more sectors than will fit in sector_t,
2686 * and whether the max offset is addressable by the page cache.
2688 if ((ext4_blocks_count(es
) >
2689 (sector_t
)(~0ULL) >> (sb
->s_blocksize_bits
- 9)) ||
2690 (ext4_blocks_count(es
) >
2691 (pgoff_t
)(~0ULL) >> (PAGE_CACHE_SHIFT
- sb
->s_blocksize_bits
))) {
2692 ext4_msg(sb
, KERN_ERR
, "filesystem"
2693 " too large to mount safely on this system");
2694 if (sizeof(sector_t
) < 8)
2695 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
2700 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
2703 /* check blocks count against device size */
2704 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
2705 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
2706 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
2707 "exceeds size of device (%llu blocks)",
2708 ext4_blocks_count(es
), blocks_count
);
2713 * It makes no sense for the first data block to be beyond the end
2714 * of the filesystem.
2716 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
2717 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data"
2718 "block %u is beyond end of filesystem (%llu)",
2719 le32_to_cpu(es
->s_first_data_block
),
2720 ext4_blocks_count(es
));
2723 blocks_count
= (ext4_blocks_count(es
) -
2724 le32_to_cpu(es
->s_first_data_block
) +
2725 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2726 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
2727 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
2728 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
2729 "(block count %llu, first data block %u, "
2730 "blocks per group %lu)", sbi
->s_groups_count
,
2731 ext4_blocks_count(es
),
2732 le32_to_cpu(es
->s_first_data_block
),
2733 EXT4_BLOCKS_PER_GROUP(sb
));
2736 sbi
->s_groups_count
= blocks_count
;
2737 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
2738 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
2739 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
2740 EXT4_DESC_PER_BLOCK(sb
);
2741 sbi
->s_group_desc
= kmalloc(db_count
* sizeof(struct buffer_head
*),
2743 if (sbi
->s_group_desc
== NULL
) {
2744 ext4_msg(sb
, KERN_ERR
, "not enough memory");
2748 #ifdef CONFIG_PROC_FS
2750 sbi
->s_proc
= proc_mkdir(sb
->s_id
, ext4_proc_root
);
2753 bgl_lock_init(sbi
->s_blockgroup_lock
);
2755 for (i
= 0; i
< db_count
; i
++) {
2756 block
= descriptor_loc(sb
, logical_sb_block
, i
);
2757 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
2758 if (!sbi
->s_group_desc
[i
]) {
2759 ext4_msg(sb
, KERN_ERR
,
2760 "can't read group descriptor %d", i
);
2765 if (!ext4_check_descriptors(sb
)) {
2766 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
2769 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
2770 if (!ext4_fill_flex_info(sb
)) {
2771 ext4_msg(sb
, KERN_ERR
,
2772 "unable to initialize "
2773 "flex_bg meta info!");
2777 sbi
->s_gdb_count
= db_count
;
2778 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
2779 spin_lock_init(&sbi
->s_next_gen_lock
);
2781 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
2782 ext4_count_free_blocks(sb
));
2784 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
2785 ext4_count_free_inodes(sb
));
2788 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
2789 ext4_count_dirs(sb
));
2792 err
= percpu_counter_init(&sbi
->s_dirtyblocks_counter
, 0);
2795 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
2799 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
2800 sbi
->s_max_writeback_mb_bump
= 128;
2803 * set up enough so that it can read an inode
2805 if (!test_opt(sb
, NOLOAD
) &&
2806 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
2807 sb
->s_op
= &ext4_sops
;
2809 sb
->s_op
= &ext4_nojournal_sops
;
2810 sb
->s_export_op
= &ext4_export_ops
;
2811 sb
->s_xattr
= ext4_xattr_handlers
;
2813 sb
->s_qcop
= &ext4_qctl_operations
;
2814 sb
->dq_op
= &ext4_quota_operations
;
2816 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
2817 mutex_init(&sbi
->s_orphan_lock
);
2818 mutex_init(&sbi
->s_resize_lock
);
2822 needs_recovery
= (es
->s_last_orphan
!= 0 ||
2823 EXT4_HAS_INCOMPAT_FEATURE(sb
,
2824 EXT4_FEATURE_INCOMPAT_RECOVER
));
2827 * The first inode we look at is the journal inode. Don't try
2828 * root first: it may be modified in the journal!
2830 if (!test_opt(sb
, NOLOAD
) &&
2831 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
2832 if (ext4_load_journal(sb
, es
, journal_devnum
))
2834 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
2835 EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
2836 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
2837 "suppressed and not mounted read-only");
2838 goto failed_mount_wq
;
2840 clear_opt(sbi
->s_mount_opt
, DATA_FLAGS
);
2841 set_opt(sbi
->s_mount_opt
, WRITEBACK_DATA
);
2842 sbi
->s_journal
= NULL
;
2847 if (ext4_blocks_count(es
) > 0xffffffffULL
&&
2848 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
2849 JBD2_FEATURE_INCOMPAT_64BIT
)) {
2850 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
2851 goto failed_mount_wq
;
2854 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
2855 jbd2_journal_set_features(sbi
->s_journal
,
2856 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2857 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2858 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
2859 jbd2_journal_set_features(sbi
->s_journal
,
2860 JBD2_FEATURE_COMPAT_CHECKSUM
, 0, 0);
2861 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
2862 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2864 jbd2_journal_clear_features(sbi
->s_journal
,
2865 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2866 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2869 /* We have now updated the journal if required, so we can
2870 * validate the data journaling mode. */
2871 switch (test_opt(sb
, DATA_FLAGS
)) {
2873 /* No mode set, assume a default based on the journal
2874 * capabilities: ORDERED_DATA if the journal can
2875 * cope, else JOURNAL_DATA
2877 if (jbd2_journal_check_available_features
2878 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
2879 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
2881 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
2884 case EXT4_MOUNT_ORDERED_DATA
:
2885 case EXT4_MOUNT_WRITEBACK_DATA
:
2886 if (!jbd2_journal_check_available_features
2887 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
2888 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
2889 "requested data journaling mode");
2890 goto failed_mount_wq
;
2895 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
2898 if (test_opt(sb
, NOBH
)) {
2899 if (!(test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)) {
2900 ext4_msg(sb
, KERN_WARNING
, "Ignoring nobh option - "
2901 "its supported only with writeback mode");
2902 clear_opt(sbi
->s_mount_opt
, NOBH
);
2904 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
2905 ext4_msg(sb
, KERN_WARNING
, "dioread_nolock option is "
2906 "not supported with nobh mode");
2907 goto failed_mount_wq
;
2910 EXT4_SB(sb
)->dio_unwritten_wq
= create_workqueue("ext4-dio-unwritten");
2911 if (!EXT4_SB(sb
)->dio_unwritten_wq
) {
2912 printk(KERN_ERR
"EXT4-fs: failed to create DIO workqueue\n");
2913 goto failed_mount_wq
;
2917 * The jbd2_journal_load will have done any necessary log recovery,
2918 * so we can safely mount the rest of the filesystem now.
2921 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
2923 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
2924 ret
= PTR_ERR(root
);
2927 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
2929 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
2932 sb
->s_root
= d_alloc_root(root
);
2934 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
2940 ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
);
2942 /* determine the minimum size of new large inodes, if present */
2943 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
2944 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2945 EXT4_GOOD_OLD_INODE_SIZE
;
2946 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2947 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
2948 if (sbi
->s_want_extra_isize
<
2949 le16_to_cpu(es
->s_want_extra_isize
))
2950 sbi
->s_want_extra_isize
=
2951 le16_to_cpu(es
->s_want_extra_isize
);
2952 if (sbi
->s_want_extra_isize
<
2953 le16_to_cpu(es
->s_min_extra_isize
))
2954 sbi
->s_want_extra_isize
=
2955 le16_to_cpu(es
->s_min_extra_isize
);
2958 /* Check if enough inode space is available */
2959 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
2960 sbi
->s_inode_size
) {
2961 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2962 EXT4_GOOD_OLD_INODE_SIZE
;
2963 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
2967 if (test_opt(sb
, DELALLOC
) &&
2968 (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)) {
2969 ext4_msg(sb
, KERN_WARNING
, "Ignoring delalloc option - "
2970 "requested data journaling mode");
2971 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
2973 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
2974 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
2975 ext4_msg(sb
, KERN_WARNING
, "Ignoring dioread_nolock "
2976 "option - requested data journaling mode");
2977 clear_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
2979 if (sb
->s_blocksize
< PAGE_SIZE
) {
2980 ext4_msg(sb
, KERN_WARNING
, "Ignoring dioread_nolock "
2981 "option - block size is too small");
2982 clear_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
2986 err
= ext4_setup_system_zone(sb
);
2988 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
2989 "zone (%d)\n", err
);
2994 err
= ext4_mb_init(sb
, needs_recovery
);
2996 ext4_msg(sb
, KERN_ERR
, "failed to initalize mballoc (%d)",
3001 sbi
->s_kobj
.kset
= ext4_kset
;
3002 init_completion(&sbi
->s_kobj_unregister
);
3003 err
= kobject_init_and_add(&sbi
->s_kobj
, &ext4_ktype
, NULL
,
3006 ext4_mb_release(sb
);
3007 ext4_ext_release(sb
);
3011 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
3012 ext4_orphan_cleanup(sb
, es
);
3013 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
3014 if (needs_recovery
) {
3015 ext4_msg(sb
, KERN_INFO
, "recovery complete");
3016 ext4_mark_recovery_complete(sb
, es
);
3018 if (EXT4_SB(sb
)->s_journal
) {
3019 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
3020 descr
= " journalled data mode";
3021 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
3022 descr
= " ordered data mode";
3024 descr
= " writeback data mode";
3026 descr
= "out journal";
3028 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s", descr
);
3035 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
3039 ext4_msg(sb
, KERN_ERR
, "mount failed");
3040 destroy_workqueue(EXT4_SB(sb
)->dio_unwritten_wq
);
3042 ext4_release_system_zone(sb
);
3043 if (sbi
->s_journal
) {
3044 jbd2_journal_destroy(sbi
->s_journal
);
3045 sbi
->s_journal
= NULL
;
3048 if (sbi
->s_flex_groups
) {
3049 if (is_vmalloc_addr(sbi
->s_flex_groups
))
3050 vfree(sbi
->s_flex_groups
);
3052 kfree(sbi
->s_flex_groups
);
3054 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
3055 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
3056 percpu_counter_destroy(&sbi
->s_dirs_counter
);
3057 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
3059 for (i
= 0; i
< db_count
; i
++)
3060 brelse(sbi
->s_group_desc
[i
]);
3061 kfree(sbi
->s_group_desc
);
3064 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
3067 for (i
= 0; i
< MAXQUOTAS
; i
++)
3068 kfree(sbi
->s_qf_names
[i
]);
3070 ext4_blkdev_remove(sbi
);
3073 sb
->s_fs_info
= NULL
;
3074 kfree(sbi
->s_blockgroup_lock
);
3081 * Setup any per-fs journal parameters now. We'll do this both on
3082 * initial mount, once the journal has been initialised but before we've
3083 * done any recovery; and again on any subsequent remount.
3085 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
3087 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3089 journal
->j_commit_interval
= sbi
->s_commit_interval
;
3090 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
3091 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
3093 spin_lock(&journal
->j_state_lock
);
3094 if (test_opt(sb
, BARRIER
))
3095 journal
->j_flags
|= JBD2_BARRIER
;
3097 journal
->j_flags
&= ~JBD2_BARRIER
;
3098 if (test_opt(sb
, DATA_ERR_ABORT
))
3099 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
3101 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
3102 spin_unlock(&journal
->j_state_lock
);
3105 static journal_t
*ext4_get_journal(struct super_block
*sb
,
3106 unsigned int journal_inum
)
3108 struct inode
*journal_inode
;
3111 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3113 /* First, test for the existence of a valid inode on disk. Bad
3114 * things happen if we iget() an unused inode, as the subsequent
3115 * iput() will try to delete it. */
3117 journal_inode
= ext4_iget(sb
, journal_inum
);
3118 if (IS_ERR(journal_inode
)) {
3119 ext4_msg(sb
, KERN_ERR
, "no journal found");
3122 if (!journal_inode
->i_nlink
) {
3123 make_bad_inode(journal_inode
);
3124 iput(journal_inode
);
3125 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
3129 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3130 journal_inode
, journal_inode
->i_size
);
3131 if (!S_ISREG(journal_inode
->i_mode
)) {
3132 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
3133 iput(journal_inode
);
3137 journal
= jbd2_journal_init_inode(journal_inode
);
3139 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
3140 iput(journal_inode
);
3143 journal
->j_private
= sb
;
3144 ext4_init_journal_params(sb
, journal
);
3148 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
3151 struct buffer_head
*bh
;
3155 int hblock
, blocksize
;
3156 ext4_fsblk_t sb_block
;
3157 unsigned long offset
;
3158 struct ext4_super_block
*es
;
3159 struct block_device
*bdev
;
3161 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3163 bdev
= ext4_blkdev_get(j_dev
, sb
);
3167 if (bd_claim(bdev
, sb
)) {
3168 ext4_msg(sb
, KERN_ERR
,
3169 "failed to claim external journal device");
3170 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
3174 blocksize
= sb
->s_blocksize
;
3175 hblock
= bdev_logical_block_size(bdev
);
3176 if (blocksize
< hblock
) {
3177 ext4_msg(sb
, KERN_ERR
,
3178 "blocksize too small for journal device");
3182 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
3183 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
3184 set_blocksize(bdev
, blocksize
);
3185 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
3186 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
3187 "external journal");
3191 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
3192 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
3193 !(le32_to_cpu(es
->s_feature_incompat
) &
3194 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
3195 ext4_msg(sb
, KERN_ERR
, "external journal has "
3201 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
3202 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
3207 len
= ext4_blocks_count(es
);
3208 start
= sb_block
+ 1;
3209 brelse(bh
); /* we're done with the superblock */
3211 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
3212 start
, len
, blocksize
);
3214 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
3217 journal
->j_private
= sb
;
3218 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
3219 wait_on_buffer(journal
->j_sb_buffer
);
3220 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
3221 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
3224 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
3225 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
3226 "user (unsupported) - %d",
3227 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
3230 EXT4_SB(sb
)->journal_bdev
= bdev
;
3231 ext4_init_journal_params(sb
, journal
);
3235 jbd2_journal_destroy(journal
);
3237 ext4_blkdev_put(bdev
);
3241 static int ext4_load_journal(struct super_block
*sb
,
3242 struct ext4_super_block
*es
,
3243 unsigned long journal_devnum
)
3246 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
3249 int really_read_only
;
3251 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3253 if (journal_devnum
&&
3254 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3255 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
3256 "numbers have changed");
3257 journal_dev
= new_decode_dev(journal_devnum
);
3259 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
3261 really_read_only
= bdev_read_only(sb
->s_bdev
);
3264 * Are we loading a blank journal or performing recovery after a
3265 * crash? For recovery, we need to check in advance whether we
3266 * can get read-write access to the device.
3268 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3269 if (sb
->s_flags
& MS_RDONLY
) {
3270 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
3271 "required on readonly filesystem");
3272 if (really_read_only
) {
3273 ext4_msg(sb
, KERN_ERR
, "write access "
3274 "unavailable, cannot proceed");
3277 ext4_msg(sb
, KERN_INFO
, "write access will "
3278 "be enabled during recovery");
3282 if (journal_inum
&& journal_dev
) {
3283 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
3284 "and inode journals!");
3289 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
3292 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
3296 if (!(journal
->j_flags
& JBD2_BARRIER
))
3297 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
3299 if (!really_read_only
&& test_opt(sb
, UPDATE_JOURNAL
)) {
3300 err
= jbd2_journal_update_format(journal
);
3302 ext4_msg(sb
, KERN_ERR
, "error updating journal");
3303 jbd2_journal_destroy(journal
);
3308 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
3309 err
= jbd2_journal_wipe(journal
, !really_read_only
);
3311 err
= jbd2_journal_load(journal
);
3314 ext4_msg(sb
, KERN_ERR
, "error loading journal");
3315 jbd2_journal_destroy(journal
);
3319 EXT4_SB(sb
)->s_journal
= journal
;
3320 ext4_clear_journal_err(sb
, es
);
3322 if (journal_devnum
&&
3323 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3324 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
3326 /* Make sure we flush the recovery flag to disk. */
3327 ext4_commit_super(sb
, 1);
3333 static int ext4_commit_super(struct super_block
*sb
, int sync
)
3335 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
3336 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
3341 if (buffer_write_io_error(sbh
)) {
3343 * Oh, dear. A previous attempt to write the
3344 * superblock failed. This could happen because the
3345 * USB device was yanked out. Or it could happen to
3346 * be a transient write error and maybe the block will
3347 * be remapped. Nothing we can do but to retry the
3348 * write and hope for the best.
3350 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
3351 "superblock detected");
3352 clear_buffer_write_io_error(sbh
);
3353 set_buffer_uptodate(sbh
);
3356 * If the file system is mounted read-only, don't update the
3357 * superblock write time. This avoids updating the superblock
3358 * write time when we are mounting the root file system
3359 * read/only but we need to replay the journal; at that point,
3360 * for people who are east of GMT and who make their clock
3361 * tick in localtime for Windows bug-for-bug compatibility,
3362 * the clock is set in the future, and this will cause e2fsck
3363 * to complain and force a full file system check.
3365 if (!(sb
->s_flags
& MS_RDONLY
))
3366 es
->s_wtime
= cpu_to_le32(get_seconds());
3367 es
->s_kbytes_written
=
3368 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
3369 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
3370 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
3371 ext4_free_blocks_count_set(es
, percpu_counter_sum_positive(
3372 &EXT4_SB(sb
)->s_freeblocks_counter
));
3373 es
->s_free_inodes_count
= cpu_to_le32(percpu_counter_sum_positive(
3374 &EXT4_SB(sb
)->s_freeinodes_counter
));
3376 BUFFER_TRACE(sbh
, "marking dirty");
3377 mark_buffer_dirty(sbh
);
3379 error
= sync_dirty_buffer(sbh
);
3383 error
= buffer_write_io_error(sbh
);
3385 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
3387 clear_buffer_write_io_error(sbh
);
3388 set_buffer_uptodate(sbh
);
3395 * Have we just finished recovery? If so, and if we are mounting (or
3396 * remounting) the filesystem readonly, then we will end up with a
3397 * consistent fs on disk. Record that fact.
3399 static void ext4_mark_recovery_complete(struct super_block
*sb
,
3400 struct ext4_super_block
*es
)
3402 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
3404 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
3405 BUG_ON(journal
!= NULL
);
3408 jbd2_journal_lock_updates(journal
);
3409 if (jbd2_journal_flush(journal
) < 0)
3412 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
3413 sb
->s_flags
& MS_RDONLY
) {
3414 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3415 ext4_commit_super(sb
, 1);
3419 jbd2_journal_unlock_updates(journal
);
3423 * If we are mounting (or read-write remounting) a filesystem whose journal
3424 * has recorded an error from a previous lifetime, move that error to the
3425 * main filesystem now.
3427 static void ext4_clear_journal_err(struct super_block
*sb
,
3428 struct ext4_super_block
*es
)
3434 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3436 journal
= EXT4_SB(sb
)->s_journal
;
3439 * Now check for any error status which may have been recorded in the
3440 * journal by a prior ext4_error() or ext4_abort()
3443 j_errno
= jbd2_journal_errno(journal
);
3447 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
3448 ext4_warning(sb
, "Filesystem error recorded "
3449 "from previous mount: %s", errstr
);
3450 ext4_warning(sb
, "Marking fs in need of filesystem check.");
3452 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
3453 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
3454 ext4_commit_super(sb
, 1);
3456 jbd2_journal_clear_err(journal
);
3461 * Force the running and committing transactions to commit,
3462 * and wait on the commit.
3464 int ext4_force_commit(struct super_block
*sb
)
3469 if (sb
->s_flags
& MS_RDONLY
)
3472 journal
= EXT4_SB(sb
)->s_journal
;
3474 ret
= ext4_journal_force_commit(journal
);
3479 static void ext4_write_super(struct super_block
*sb
)
3482 ext4_commit_super(sb
, 1);
3486 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
3490 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3492 trace_ext4_sync_fs(sb
, wait
);
3493 flush_workqueue(sbi
->dio_unwritten_wq
);
3494 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
3496 jbd2_log_wait_commit(sbi
->s_journal
, target
);
3502 * LVM calls this function before a (read-only) snapshot is created. This
3503 * gives us a chance to flush the journal completely and mark the fs clean.
3505 static int ext4_freeze(struct super_block
*sb
)
3510 if (sb
->s_flags
& MS_RDONLY
)
3513 journal
= EXT4_SB(sb
)->s_journal
;
3515 /* Now we set up the journal barrier. */
3516 jbd2_journal_lock_updates(journal
);
3519 * Don't clear the needs_recovery flag if we failed to flush
3522 error
= jbd2_journal_flush(journal
);
3525 jbd2_journal_unlock_updates(journal
);
3529 /* Journal blocked and flushed, clear needs_recovery flag. */
3530 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3531 error
= ext4_commit_super(sb
, 1);
3538 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3539 * flag here, even though the filesystem is not technically dirty yet.
3541 static int ext4_unfreeze(struct super_block
*sb
)
3543 if (sb
->s_flags
& MS_RDONLY
)
3547 /* Reset the needs_recovery flag before the fs is unlocked. */
3548 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3549 ext4_commit_super(sb
, 1);
3551 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
3555 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
3557 struct ext4_super_block
*es
;
3558 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3559 ext4_fsblk_t n_blocks_count
= 0;
3560 unsigned long old_sb_flags
;
3561 struct ext4_mount_options old_opts
;
3563 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3571 /* Store the original options */
3573 old_sb_flags
= sb
->s_flags
;
3574 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
3575 old_opts
.s_resuid
= sbi
->s_resuid
;
3576 old_opts
.s_resgid
= sbi
->s_resgid
;
3577 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
3578 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
3579 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
3581 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
3582 for (i
= 0; i
< MAXQUOTAS
; i
++)
3583 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
3585 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
3586 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
3589 * Allow the "check" option to be passed as a remount option.
3591 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
,
3592 &n_blocks_count
, 1)) {
3597 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
3598 ext4_abort(sb
, __func__
, "Abort forced by user");
3600 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3601 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
3605 if (sbi
->s_journal
) {
3606 ext4_init_journal_params(sb
, sbi
->s_journal
);
3607 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
3610 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
) ||
3611 n_blocks_count
> ext4_blocks_count(es
)) {
3612 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
3617 if (*flags
& MS_RDONLY
) {
3619 * First of all, the unconditional stuff we have to do
3620 * to disable replay of the journal when we next remount
3622 sb
->s_flags
|= MS_RDONLY
;
3625 * OK, test if we are remounting a valid rw partition
3626 * readonly, and if so set the rdonly flag and then
3627 * mark the partition as valid again.
3629 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
3630 (sbi
->s_mount_state
& EXT4_VALID_FS
))
3631 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
3634 ext4_mark_recovery_complete(sb
, es
);
3636 /* Make sure we can mount this feature set readwrite */
3637 if (!ext4_feature_set_ok(sb
, 0)) {
3642 * Make sure the group descriptor checksums
3643 * are sane. If they aren't, refuse to remount r/w.
3645 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
3646 struct ext4_group_desc
*gdp
=
3647 ext4_get_group_desc(sb
, g
, NULL
);
3649 if (!ext4_group_desc_csum_verify(sbi
, g
, gdp
)) {
3650 ext4_msg(sb
, KERN_ERR
,
3651 "ext4_remount: Checksum for group %u failed (%u!=%u)",
3652 g
, le16_to_cpu(ext4_group_desc_csum(sbi
, g
, gdp
)),
3653 le16_to_cpu(gdp
->bg_checksum
));
3660 * If we have an unprocessed orphan list hanging
3661 * around from a previously readonly bdev mount,
3662 * require a full umount/remount for now.
3664 if (es
->s_last_orphan
) {
3665 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
3666 "remount RDWR because of unprocessed "
3667 "orphan inode list. Please "
3668 "umount/remount instead");
3674 * Mounting a RDONLY partition read-write, so reread
3675 * and store the current valid flag. (It may have
3676 * been changed by e2fsck since we originally mounted
3680 ext4_clear_journal_err(sb
, es
);
3681 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3682 if ((err
= ext4_group_extend(sb
, es
, n_blocks_count
)))
3684 if (!ext4_setup_super(sb
, es
, 0))
3685 sb
->s_flags
&= ~MS_RDONLY
;
3688 ext4_setup_system_zone(sb
);
3689 if (sbi
->s_journal
== NULL
)
3690 ext4_commit_super(sb
, 1);
3693 /* Release old quota file names */
3694 for (i
= 0; i
< MAXQUOTAS
; i
++)
3695 if (old_opts
.s_qf_names
[i
] &&
3696 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3697 kfree(old_opts
.s_qf_names
[i
]);
3704 sb
->s_flags
= old_sb_flags
;
3705 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
3706 sbi
->s_resuid
= old_opts
.s_resuid
;
3707 sbi
->s_resgid
= old_opts
.s_resgid
;
3708 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
3709 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
3710 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
3712 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
3713 for (i
= 0; i
< MAXQUOTAS
; i
++) {
3714 if (sbi
->s_qf_names
[i
] &&
3715 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3716 kfree(sbi
->s_qf_names
[i
]);
3717 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
3725 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
3727 struct super_block
*sb
= dentry
->d_sb
;
3728 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3729 struct ext4_super_block
*es
= sbi
->s_es
;
3732 if (test_opt(sb
, MINIX_DF
)) {
3733 sbi
->s_overhead_last
= 0;
3734 } else if (sbi
->s_blocks_last
!= ext4_blocks_count(es
)) {
3735 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3736 ext4_fsblk_t overhead
= 0;
3739 * Compute the overhead (FS structures). This is constant
3740 * for a given filesystem unless the number of block groups
3741 * changes so we cache the previous value until it does.
3745 * All of the blocks before first_data_block are
3748 overhead
= le32_to_cpu(es
->s_first_data_block
);
3751 * Add the overhead attributed to the superblock and
3752 * block group descriptors. If the sparse superblocks
3753 * feature is turned on, then not all groups have this.
3755 for (i
= 0; i
< ngroups
; i
++) {
3756 overhead
+= ext4_bg_has_super(sb
, i
) +
3757 ext4_bg_num_gdb(sb
, i
);
3762 * Every block group has an inode bitmap, a block
3763 * bitmap, and an inode table.
3765 overhead
+= ngroups
* (2 + sbi
->s_itb_per_group
);
3766 sbi
->s_overhead_last
= overhead
;
3768 sbi
->s_blocks_last
= ext4_blocks_count(es
);
3771 buf
->f_type
= EXT4_SUPER_MAGIC
;
3772 buf
->f_bsize
= sb
->s_blocksize
;
3773 buf
->f_blocks
= ext4_blocks_count(es
) - sbi
->s_overhead_last
;
3774 buf
->f_bfree
= percpu_counter_sum_positive(&sbi
->s_freeblocks_counter
) -
3775 percpu_counter_sum_positive(&sbi
->s_dirtyblocks_counter
);
3776 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
3777 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
3779 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
3780 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
3781 buf
->f_namelen
= EXT4_NAME_LEN
;
3782 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
3783 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
3784 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
3785 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
3790 /* Helper function for writing quotas on sync - we need to start transaction
3791 * before quota file is locked for write. Otherwise the are possible deadlocks:
3792 * Process 1 Process 2
3793 * ext4_create() quota_sync()
3794 * jbd2_journal_start() write_dquot()
3795 * dquot_initialize() down(dqio_mutex)
3796 * down(dqio_mutex) jbd2_journal_start()
3802 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
3804 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_type
];
3807 static int ext4_write_dquot(struct dquot
*dquot
)
3811 struct inode
*inode
;
3813 inode
= dquot_to_inode(dquot
);
3814 handle
= ext4_journal_start(inode
,
3815 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
3817 return PTR_ERR(handle
);
3818 ret
= dquot_commit(dquot
);
3819 err
= ext4_journal_stop(handle
);
3825 static int ext4_acquire_dquot(struct dquot
*dquot
)
3830 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3831 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
3833 return PTR_ERR(handle
);
3834 ret
= dquot_acquire(dquot
);
3835 err
= ext4_journal_stop(handle
);
3841 static int ext4_release_dquot(struct dquot
*dquot
)
3846 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3847 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
3848 if (IS_ERR(handle
)) {
3849 /* Release dquot anyway to avoid endless cycle in dqput() */
3850 dquot_release(dquot
);
3851 return PTR_ERR(handle
);
3853 ret
= dquot_release(dquot
);
3854 err
= ext4_journal_stop(handle
);
3860 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
3862 /* Are we journaling quotas? */
3863 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
3864 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
3865 dquot_mark_dquot_dirty(dquot
);
3866 return ext4_write_dquot(dquot
);
3868 return dquot_mark_dquot_dirty(dquot
);
3872 static int ext4_write_info(struct super_block
*sb
, int type
)
3877 /* Data block + inode block */
3878 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
3880 return PTR_ERR(handle
);
3881 ret
= dquot_commit_info(sb
, type
);
3882 err
= ext4_journal_stop(handle
);
3889 * Turn on quotas during mount time - we need to find
3890 * the quota file and such...
3892 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
3894 return vfs_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
3895 EXT4_SB(sb
)->s_jquota_fmt
, type
);
3899 * Standard function to be called on quota_on
3901 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
3902 char *name
, int remount
)
3907 if (!test_opt(sb
, QUOTA
))
3909 /* When remounting, no checks are needed and in fact, name is NULL */
3911 return vfs_quota_on(sb
, type
, format_id
, name
, remount
);
3913 err
= kern_path(name
, LOOKUP_FOLLOW
, &path
);
3917 /* Quotafile not on the same filesystem? */
3918 if (path
.mnt
->mnt_sb
!= sb
) {
3922 /* Journaling quota? */
3923 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
3924 /* Quotafile not in fs root? */
3925 if (path
.dentry
->d_parent
!= sb
->s_root
)
3926 ext4_msg(sb
, KERN_WARNING
,
3927 "Quota file not on filesystem root. "
3928 "Journaled quota will not work");
3932 * When we journal data on quota file, we have to flush journal to see
3933 * all updates to the file when we bypass pagecache...
3935 if (EXT4_SB(sb
)->s_journal
&&
3936 ext4_should_journal_data(path
.dentry
->d_inode
)) {
3938 * We don't need to lock updates but journal_flush() could
3939 * otherwise be livelocked...
3941 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
3942 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
3943 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
3950 err
= vfs_quota_on_path(sb
, type
, format_id
, &path
);
3955 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3956 * acquiring the locks... As quota files are never truncated and quota code
3957 * itself serializes the operations (and noone else should touch the files)
3958 * we don't have to be afraid of races */
3959 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
3960 size_t len
, loff_t off
)
3962 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
3963 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
3965 int offset
= off
& (sb
->s_blocksize
- 1);
3968 struct buffer_head
*bh
;
3969 loff_t i_size
= i_size_read(inode
);
3973 if (off
+len
> i_size
)
3976 while (toread
> 0) {
3977 tocopy
= sb
->s_blocksize
- offset
< toread
?
3978 sb
->s_blocksize
- offset
: toread
;
3979 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
3982 if (!bh
) /* A hole? */
3983 memset(data
, 0, tocopy
);
3985 memcpy(data
, bh
->b_data
+offset
, tocopy
);
3995 /* Write to quotafile (we know the transaction is already started and has
3996 * enough credits) */
3997 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
3998 const char *data
, size_t len
, loff_t off
)
4000 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
4001 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
4003 int offset
= off
& (sb
->s_blocksize
- 1);
4004 int journal_quota
= EXT4_SB(sb
)->s_qf_names
[type
] != NULL
;
4005 struct buffer_head
*bh
;
4006 handle_t
*handle
= journal_current_handle();
4008 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
4009 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
4010 " cancelled because transaction is not started",
4011 (unsigned long long)off
, (unsigned long long)len
);
4015 * Since we account only one data block in transaction credits,
4016 * then it is impossible to cross a block boundary.
4018 if (sb
->s_blocksize
- offset
< len
) {
4019 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
4020 " cancelled because not block aligned",
4021 (unsigned long long)off
, (unsigned long long)len
);
4025 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
4026 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
4029 if (journal_quota
) {
4030 err
= ext4_journal_get_write_access(handle
, bh
);
4037 memcpy(bh
->b_data
+offset
, data
, len
);
4038 flush_dcache_page(bh
->b_page
);
4041 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
4043 /* Always do at least ordered writes for quotas */
4044 err
= ext4_jbd2_file_inode(handle
, inode
);
4045 mark_buffer_dirty(bh
);
4050 mutex_unlock(&inode
->i_mutex
);
4053 if (inode
->i_size
< off
+ len
) {
4054 i_size_write(inode
, off
+ len
);
4055 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
4057 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
4058 ext4_mark_inode_dirty(handle
, inode
);
4059 mutex_unlock(&inode
->i_mutex
);
4065 static int ext4_get_sb(struct file_system_type
*fs_type
, int flags
,
4066 const char *dev_name
, void *data
, struct vfsmount
*mnt
)
4068 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
,mnt
);
4071 #if !defined(CONTIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4072 static struct file_system_type ext2_fs_type
= {
4073 .owner
= THIS_MODULE
,
4075 .get_sb
= ext4_get_sb
,
4076 .kill_sb
= kill_block_super
,
4077 .fs_flags
= FS_REQUIRES_DEV
,
4080 static inline void register_as_ext2(void)
4082 int err
= register_filesystem(&ext2_fs_type
);
4085 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
4088 static inline void unregister_as_ext2(void)
4090 unregister_filesystem(&ext2_fs_type
);
4092 MODULE_ALIAS("ext2");
4094 static inline void register_as_ext2(void) { }
4095 static inline void unregister_as_ext2(void) { }
4098 #if !defined(CONTIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4099 static struct file_system_type ext3_fs_type
= {
4100 .owner
= THIS_MODULE
,
4102 .get_sb
= ext4_get_sb
,
4103 .kill_sb
= kill_block_super
,
4104 .fs_flags
= FS_REQUIRES_DEV
,
4107 static inline void register_as_ext3(void)
4109 int err
= register_filesystem(&ext3_fs_type
);
4112 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
4115 static inline void unregister_as_ext3(void)
4117 unregister_filesystem(&ext3_fs_type
);
4119 MODULE_ALIAS("ext3");
4121 static inline void register_as_ext3(void) { }
4122 static inline void unregister_as_ext3(void) { }
4125 static struct file_system_type ext4_fs_type
= {
4126 .owner
= THIS_MODULE
,
4128 .get_sb
= ext4_get_sb
,
4129 .kill_sb
= kill_block_super
,
4130 .fs_flags
= FS_REQUIRES_DEV
,
4133 static int __init
init_ext4_fs(void)
4137 err
= init_ext4_system_zone();
4140 ext4_kset
= kset_create_and_add("ext4", NULL
, fs_kobj
);
4143 ext4_proc_root
= proc_mkdir("fs/ext4", NULL
);
4144 err
= init_ext4_mballoc();
4148 err
= init_ext4_xattr();
4151 err
= init_inodecache();
4156 err
= register_filesystem(&ext4_fs_type
);
4161 unregister_as_ext2();
4162 unregister_as_ext3();
4163 destroy_inodecache();
4167 exit_ext4_mballoc();
4169 remove_proc_entry("fs/ext4", NULL
);
4170 kset_unregister(ext4_kset
);
4172 exit_ext4_system_zone();
4176 static void __exit
exit_ext4_fs(void)
4178 unregister_as_ext2();
4179 unregister_as_ext3();
4180 unregister_filesystem(&ext4_fs_type
);
4181 destroy_inodecache();
4183 exit_ext4_mballoc();
4184 remove_proc_entry("fs/ext4", NULL
);
4185 kset_unregister(ext4_kset
);
4186 exit_ext4_system_zone();
4189 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4190 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4191 MODULE_LICENSE("GPL");
4192 module_init(init_ext4_fs
)
4193 module_exit(exit_ext4_fs
)