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 vfs_check_frozen(sb
, SB_FREEZE_TRANS
);
231 /* Special case here: if the journal has aborted behind our
232 * backs (eg. EIO in the commit thread), then we still need to
233 * take the FS itself readonly cleanly. */
234 journal
= EXT4_SB(sb
)->s_journal
;
236 if (is_journal_aborted(journal
)) {
237 ext4_abort(sb
, __func__
, "Detected aborted journal");
238 return ERR_PTR(-EROFS
);
240 return jbd2_journal_start(journal
, nblocks
);
242 return ext4_get_nojournal();
246 * The only special thing we need to do here is to make sure that all
247 * jbd2_journal_stop calls result in the superblock being marked dirty, so
248 * that sync() will call the filesystem's write_super callback if
251 int __ext4_journal_stop(const char *where
, handle_t
*handle
)
253 struct super_block
*sb
;
257 if (!ext4_handle_valid(handle
)) {
258 ext4_put_nojournal(handle
);
261 sb
= handle
->h_transaction
->t_journal
->j_private
;
263 rc
= jbd2_journal_stop(handle
);
268 __ext4_std_error(sb
, where
, err
);
272 void ext4_journal_abort_handle(const char *caller
, const char *err_fn
,
273 struct buffer_head
*bh
, handle_t
*handle
, int err
)
276 const char *errstr
= ext4_decode_error(NULL
, err
, nbuf
);
278 BUG_ON(!ext4_handle_valid(handle
));
281 BUFFER_TRACE(bh
, "abort");
286 if (is_handle_aborted(handle
))
289 printk(KERN_ERR
"%s: aborting transaction: %s in %s\n",
290 caller
, errstr
, err_fn
);
292 jbd2_journal_abort_handle(handle
);
295 /* Deal with the reporting of failure conditions on a filesystem such as
296 * inconsistencies detected or read IO failures.
298 * On ext2, we can store the error state of the filesystem in the
299 * superblock. That is not possible on ext4, because we may have other
300 * write ordering constraints on the superblock which prevent us from
301 * writing it out straight away; and given that the journal is about to
302 * be aborted, we can't rely on the current, or future, transactions to
303 * write out the superblock safely.
305 * We'll just use the jbd2_journal_abort() error code to record an error in
306 * the journal instead. On recovery, the journal will compain about
307 * that error until we've noted it down and cleared it.
310 static void ext4_handle_error(struct super_block
*sb
)
312 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
314 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
315 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
317 if (sb
->s_flags
& MS_RDONLY
)
320 if (!test_opt(sb
, ERRORS_CONT
)) {
321 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
323 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
325 jbd2_journal_abort(journal
, -EIO
);
327 if (test_opt(sb
, ERRORS_RO
)) {
328 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
329 sb
->s_flags
|= MS_RDONLY
;
331 ext4_commit_super(sb
, 1);
332 if (test_opt(sb
, ERRORS_PANIC
))
333 panic("EXT4-fs (device %s): panic forced after error\n",
337 void ext4_error(struct super_block
*sb
, const char *function
,
338 const char *fmt
, ...)
343 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
348 ext4_handle_error(sb
);
351 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
358 errstr
= "IO failure";
361 errstr
= "Out of memory";
364 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
365 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
366 errstr
= "Journal has aborted";
368 errstr
= "Readonly filesystem";
371 /* If the caller passed in an extra buffer for unknown
372 * errors, textualise them now. Else we just return
375 /* Check for truncated error codes... */
376 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
385 /* __ext4_std_error decodes expected errors from journaling functions
386 * automatically and invokes the appropriate error response. */
388 void __ext4_std_error(struct super_block
*sb
, const char *function
, int errno
)
393 /* Special case: if the error is EROFS, and we're not already
394 * inside a transaction, then there's really no point in logging
396 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
397 (sb
->s_flags
& MS_RDONLY
))
400 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
401 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s: %s\n",
402 sb
->s_id
, function
, errstr
);
404 ext4_handle_error(sb
);
408 * ext4_abort is a much stronger failure handler than ext4_error. The
409 * abort function may be used to deal with unrecoverable failures such
410 * as journal IO errors or ENOMEM at a critical moment in log management.
412 * We unconditionally force the filesystem into an ABORT|READONLY state,
413 * unless the error response on the fs has been set to panic in which
414 * case we take the easy way out and panic immediately.
417 void ext4_abort(struct super_block
*sb
, const char *function
,
418 const char *fmt
, ...)
423 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
428 if (test_opt(sb
, ERRORS_PANIC
))
429 panic("EXT4-fs panic from previous error\n");
431 if (sb
->s_flags
& MS_RDONLY
)
434 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
435 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
436 sb
->s_flags
|= MS_RDONLY
;
437 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
438 if (EXT4_SB(sb
)->s_journal
)
439 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
442 void ext4_msg (struct super_block
* sb
, const char *prefix
,
443 const char *fmt
, ...)
448 printk("%sEXT4-fs (%s): ", prefix
, sb
->s_id
);
454 void ext4_warning(struct super_block
*sb
, const char *function
,
455 const char *fmt
, ...)
460 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s: ",
467 void ext4_grp_locked_error(struct super_block
*sb
, ext4_group_t grp
,
468 const char *function
, const char *fmt
, ...)
473 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
476 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
481 if (test_opt(sb
, ERRORS_CONT
)) {
482 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
483 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
484 ext4_commit_super(sb
, 0);
487 ext4_unlock_group(sb
, grp
);
488 ext4_handle_error(sb
);
490 * We only get here in the ERRORS_RO case; relocking the group
491 * may be dangerous, but nothing bad will happen since the
492 * filesystem will have already been marked read/only and the
493 * journal has been aborted. We return 1 as a hint to callers
494 * who might what to use the return value from
495 * ext4_grp_locked_error() to distinguish beween the
496 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
497 * aggressively from the ext4 function in question, with a
498 * more appropriate error code.
500 ext4_lock_group(sb
, grp
);
504 void ext4_update_dynamic_rev(struct super_block
*sb
)
506 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
508 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
511 ext4_warning(sb
, __func__
,
512 "updating to rev %d because of new feature flag, "
513 "running e2fsck is recommended",
516 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
517 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
518 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
519 /* leave es->s_feature_*compat flags alone */
520 /* es->s_uuid will be set by e2fsck if empty */
523 * The rest of the superblock fields should be zero, and if not it
524 * means they are likely already in use, so leave them alone. We
525 * can leave it up to e2fsck to clean up any inconsistencies there.
530 * Open the external journal device
532 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
534 struct block_device
*bdev
;
535 char b
[BDEVNAME_SIZE
];
537 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
543 ext4_msg(sb
, KERN_ERR
, "failed to open journal device %s: %ld",
544 __bdevname(dev
, b
), PTR_ERR(bdev
));
549 * Release the journal device
551 static int ext4_blkdev_put(struct block_device
*bdev
)
554 return blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
557 static int ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
559 struct block_device
*bdev
;
562 bdev
= sbi
->journal_bdev
;
564 ret
= ext4_blkdev_put(bdev
);
565 sbi
->journal_bdev
= NULL
;
570 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
572 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
575 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
579 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
580 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
582 printk(KERN_ERR
"sb_info orphan list:\n");
583 list_for_each(l
, &sbi
->s_orphan
) {
584 struct inode
*inode
= orphan_list_entry(l
);
586 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
587 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
588 inode
->i_mode
, inode
->i_nlink
,
593 static void ext4_put_super(struct super_block
*sb
)
595 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
596 struct ext4_super_block
*es
= sbi
->s_es
;
599 flush_workqueue(sbi
->dio_unwritten_wq
);
600 destroy_workqueue(sbi
->dio_unwritten_wq
);
605 ext4_commit_super(sb
, 1);
607 if (sbi
->s_journal
) {
608 err
= jbd2_journal_destroy(sbi
->s_journal
);
609 sbi
->s_journal
= NULL
;
611 ext4_abort(sb
, __func__
,
612 "Couldn't clean up the journal");
615 ext4_release_system_zone(sb
);
617 ext4_ext_release(sb
);
618 ext4_xattr_put_super(sb
);
620 if (!(sb
->s_flags
& MS_RDONLY
)) {
621 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
622 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
623 ext4_commit_super(sb
, 1);
626 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
628 kobject_del(&sbi
->s_kobj
);
630 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
631 brelse(sbi
->s_group_desc
[i
]);
632 kfree(sbi
->s_group_desc
);
633 if (is_vmalloc_addr(sbi
->s_flex_groups
))
634 vfree(sbi
->s_flex_groups
);
636 kfree(sbi
->s_flex_groups
);
637 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
638 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
639 percpu_counter_destroy(&sbi
->s_dirs_counter
);
640 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
643 for (i
= 0; i
< MAXQUOTAS
; i
++)
644 kfree(sbi
->s_qf_names
[i
]);
647 /* Debugging code just in case the in-memory inode orphan list
648 * isn't empty. The on-disk one can be non-empty if we've
649 * detected an error and taken the fs readonly, but the
650 * in-memory list had better be clean by this point. */
651 if (!list_empty(&sbi
->s_orphan
))
652 dump_orphan_list(sb
, sbi
);
653 J_ASSERT(list_empty(&sbi
->s_orphan
));
655 invalidate_bdev(sb
->s_bdev
);
656 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
658 * Invalidate the journal device's buffers. We don't want them
659 * floating about in memory - the physical journal device may
660 * hotswapped, and it breaks the `ro-after' testing code.
662 sync_blockdev(sbi
->journal_bdev
);
663 invalidate_bdev(sbi
->journal_bdev
);
664 ext4_blkdev_remove(sbi
);
666 sb
->s_fs_info
= NULL
;
668 * Now that we are completely done shutting down the
669 * superblock, we need to actually destroy the kobject.
673 kobject_put(&sbi
->s_kobj
);
674 wait_for_completion(&sbi
->s_kobj_unregister
);
675 kfree(sbi
->s_blockgroup_lock
);
679 static struct kmem_cache
*ext4_inode_cachep
;
682 * Called inside transaction, so use GFP_NOFS
684 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
686 struct ext4_inode_info
*ei
;
688 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
692 ei
->vfs_inode
.i_version
= 1;
693 ei
->vfs_inode
.i_data
.writeback_index
= 0;
694 memset(&ei
->i_cached_extent
, 0, sizeof(struct ext4_ext_cache
));
695 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
696 spin_lock_init(&ei
->i_prealloc_lock
);
698 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
699 * therefore it can be null here. Don't check it, just initialize
702 jbd2_journal_init_jbd_inode(&ei
->jinode
, &ei
->vfs_inode
);
703 ei
->i_reserved_data_blocks
= 0;
704 ei
->i_reserved_meta_blocks
= 0;
705 ei
->i_allocated_meta_blocks
= 0;
706 ei
->i_da_metadata_calc_len
= 0;
707 ei
->i_delalloc_reserved_flag
= 0;
708 spin_lock_init(&(ei
->i_block_reservation_lock
));
710 ei
->i_reserved_quota
= 0;
712 INIT_LIST_HEAD(&ei
->i_aio_dio_complete_list
);
713 ei
->cur_aio_dio
= NULL
;
715 ei
->i_datasync_tid
= 0;
717 return &ei
->vfs_inode
;
720 static void ext4_destroy_inode(struct inode
*inode
)
722 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
723 ext4_msg(inode
->i_sb
, KERN_ERR
,
724 "Inode %lu (%p): orphan list check failed!",
725 inode
->i_ino
, EXT4_I(inode
));
726 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
727 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
731 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
734 static void init_once(void *foo
)
736 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
738 INIT_LIST_HEAD(&ei
->i_orphan
);
739 #ifdef CONFIG_EXT4_FS_XATTR
740 init_rwsem(&ei
->xattr_sem
);
742 init_rwsem(&ei
->i_data_sem
);
743 inode_init_once(&ei
->vfs_inode
);
746 static int init_inodecache(void)
748 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
749 sizeof(struct ext4_inode_info
),
750 0, (SLAB_RECLAIM_ACCOUNT
|
753 if (ext4_inode_cachep
== NULL
)
758 static void destroy_inodecache(void)
760 kmem_cache_destroy(ext4_inode_cachep
);
763 static void ext4_clear_inode(struct inode
*inode
)
765 ext4_discard_preallocations(inode
);
766 if (EXT4_JOURNAL(inode
))
767 jbd2_journal_release_jbd_inode(EXT4_SB(inode
->i_sb
)->s_journal
,
768 &EXT4_I(inode
)->jinode
);
771 static inline void ext4_show_quota_options(struct seq_file
*seq
,
772 struct super_block
*sb
)
774 #if defined(CONFIG_QUOTA)
775 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
777 if (sbi
->s_jquota_fmt
)
778 seq_printf(seq
, ",jqfmt=%s",
779 (sbi
->s_jquota_fmt
== QFMT_VFS_OLD
) ? "vfsold" : "vfsv0");
781 if (sbi
->s_qf_names
[USRQUOTA
])
782 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
784 if (sbi
->s_qf_names
[GRPQUOTA
])
785 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
787 if (sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
)
788 seq_puts(seq
, ",usrquota");
790 if (sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
)
791 seq_puts(seq
, ",grpquota");
797 * - it's set to a non-default value OR
798 * - if the per-sb default is different from the global default
800 static int ext4_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
803 unsigned long def_mount_opts
;
804 struct super_block
*sb
= vfs
->mnt_sb
;
805 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
806 struct ext4_super_block
*es
= sbi
->s_es
;
808 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
809 def_errors
= le16_to_cpu(es
->s_errors
);
811 if (sbi
->s_sb_block
!= 1)
812 seq_printf(seq
, ",sb=%llu", sbi
->s_sb_block
);
813 if (test_opt(sb
, MINIX_DF
))
814 seq_puts(seq
, ",minixdf");
815 if (test_opt(sb
, GRPID
) && !(def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
816 seq_puts(seq
, ",grpid");
817 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
818 seq_puts(seq
, ",nogrpid");
819 if (sbi
->s_resuid
!= EXT4_DEF_RESUID
||
820 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
) {
821 seq_printf(seq
, ",resuid=%u", sbi
->s_resuid
);
823 if (sbi
->s_resgid
!= EXT4_DEF_RESGID
||
824 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
) {
825 seq_printf(seq
, ",resgid=%u", sbi
->s_resgid
);
827 if (test_opt(sb
, ERRORS_RO
)) {
828 if (def_errors
== EXT4_ERRORS_PANIC
||
829 def_errors
== EXT4_ERRORS_CONTINUE
) {
830 seq_puts(seq
, ",errors=remount-ro");
833 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
834 seq_puts(seq
, ",errors=continue");
835 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
836 seq_puts(seq
, ",errors=panic");
837 if (test_opt(sb
, NO_UID32
) && !(def_mount_opts
& EXT4_DEFM_UID16
))
838 seq_puts(seq
, ",nouid32");
839 if (test_opt(sb
, DEBUG
) && !(def_mount_opts
& EXT4_DEFM_DEBUG
))
840 seq_puts(seq
, ",debug");
841 if (test_opt(sb
, OLDALLOC
))
842 seq_puts(seq
, ",oldalloc");
843 #ifdef CONFIG_EXT4_FS_XATTR
844 if (test_opt(sb
, XATTR_USER
) &&
845 !(def_mount_opts
& EXT4_DEFM_XATTR_USER
))
846 seq_puts(seq
, ",user_xattr");
847 if (!test_opt(sb
, XATTR_USER
) &&
848 (def_mount_opts
& EXT4_DEFM_XATTR_USER
)) {
849 seq_puts(seq
, ",nouser_xattr");
852 #ifdef CONFIG_EXT4_FS_POSIX_ACL
853 if (test_opt(sb
, POSIX_ACL
) && !(def_mount_opts
& EXT4_DEFM_ACL
))
854 seq_puts(seq
, ",acl");
855 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT4_DEFM_ACL
))
856 seq_puts(seq
, ",noacl");
858 if (sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
) {
859 seq_printf(seq
, ",commit=%u",
860 (unsigned) (sbi
->s_commit_interval
/ HZ
));
862 if (sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
) {
863 seq_printf(seq
, ",min_batch_time=%u",
864 (unsigned) sbi
->s_min_batch_time
);
866 if (sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
) {
867 seq_printf(seq
, ",max_batch_time=%u",
868 (unsigned) sbi
->s_min_batch_time
);
872 * We're changing the default of barrier mount option, so
873 * let's always display its mount state so it's clear what its
876 seq_puts(seq
, ",barrier=");
877 seq_puts(seq
, test_opt(sb
, BARRIER
) ? "1" : "0");
878 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
))
879 seq_puts(seq
, ",journal_async_commit");
880 else if (test_opt(sb
, JOURNAL_CHECKSUM
))
881 seq_puts(seq
, ",journal_checksum");
882 if (test_opt(sb
, NOBH
))
883 seq_puts(seq
, ",nobh");
884 if (test_opt(sb
, I_VERSION
))
885 seq_puts(seq
, ",i_version");
886 if (!test_opt(sb
, DELALLOC
))
887 seq_puts(seq
, ",nodelalloc");
891 seq_printf(seq
, ",stripe=%lu", sbi
->s_stripe
);
893 * journal mode get enabled in different ways
894 * So just print the value even if we didn't specify it
896 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
897 seq_puts(seq
, ",data=journal");
898 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
899 seq_puts(seq
, ",data=ordered");
900 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
901 seq_puts(seq
, ",data=writeback");
903 if (sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
904 seq_printf(seq
, ",inode_readahead_blks=%u",
905 sbi
->s_inode_readahead_blks
);
907 if (test_opt(sb
, DATA_ERR_ABORT
))
908 seq_puts(seq
, ",data_err=abort");
910 if (test_opt(sb
, NO_AUTO_DA_ALLOC
))
911 seq_puts(seq
, ",noauto_da_alloc");
913 if (test_opt(sb
, DISCARD
))
914 seq_puts(seq
, ",discard");
916 if (test_opt(sb
, NOLOAD
))
917 seq_puts(seq
, ",norecovery");
919 ext4_show_quota_options(seq
, sb
);
924 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
925 u64 ino
, u32 generation
)
929 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
930 return ERR_PTR(-ESTALE
);
931 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
932 return ERR_PTR(-ESTALE
);
934 /* iget isn't really right if the inode is currently unallocated!!
936 * ext4_read_inode will return a bad_inode if the inode had been
937 * deleted, so we should be safe.
939 * Currently we don't know the generation for parent directory, so
940 * a generation of 0 means "accept any"
942 inode
= ext4_iget(sb
, ino
);
944 return ERR_CAST(inode
);
945 if (generation
&& inode
->i_generation
!= generation
) {
947 return ERR_PTR(-ESTALE
);
953 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
954 int fh_len
, int fh_type
)
956 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
960 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
961 int fh_len
, int fh_type
)
963 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
968 * Try to release metadata pages (indirect blocks, directories) which are
969 * mapped via the block device. Since these pages could have journal heads
970 * which would prevent try_to_free_buffers() from freeing them, we must use
971 * jbd2 layer's try_to_free_buffers() function to release them.
973 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
976 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
978 WARN_ON(PageChecked(page
));
979 if (!page_has_buffers(page
))
982 return jbd2_journal_try_to_free_buffers(journal
, page
,
984 return try_to_free_buffers(page
);
988 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
989 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
991 static int ext4_write_dquot(struct dquot
*dquot
);
992 static int ext4_acquire_dquot(struct dquot
*dquot
);
993 static int ext4_release_dquot(struct dquot
*dquot
);
994 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
995 static int ext4_write_info(struct super_block
*sb
, int type
);
996 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
997 char *path
, int remount
);
998 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
999 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1000 size_t len
, loff_t off
);
1001 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1002 const char *data
, size_t len
, loff_t off
);
1004 static const struct dquot_operations ext4_quota_operations
= {
1005 .initialize
= dquot_initialize
,
1007 .alloc_space
= dquot_alloc_space
,
1008 .reserve_space
= dquot_reserve_space
,
1009 .claim_space
= dquot_claim_space
,
1010 .release_rsv
= dquot_release_reserved_space
,
1012 .get_reserved_space
= ext4_get_reserved_space
,
1014 .alloc_inode
= dquot_alloc_inode
,
1015 .free_space
= dquot_free_space
,
1016 .free_inode
= dquot_free_inode
,
1017 .transfer
= dquot_transfer
,
1018 .write_dquot
= ext4_write_dquot
,
1019 .acquire_dquot
= ext4_acquire_dquot
,
1020 .release_dquot
= ext4_release_dquot
,
1021 .mark_dirty
= ext4_mark_dquot_dirty
,
1022 .write_info
= ext4_write_info
,
1023 .alloc_dquot
= dquot_alloc
,
1024 .destroy_dquot
= dquot_destroy
,
1027 static const struct quotactl_ops ext4_qctl_operations
= {
1028 .quota_on
= ext4_quota_on
,
1029 .quota_off
= vfs_quota_off
,
1030 .quota_sync
= vfs_quota_sync
,
1031 .get_info
= vfs_get_dqinfo
,
1032 .set_info
= vfs_set_dqinfo
,
1033 .get_dqblk
= vfs_get_dqblk
,
1034 .set_dqblk
= vfs_set_dqblk
1038 static const struct super_operations ext4_sops
= {
1039 .alloc_inode
= ext4_alloc_inode
,
1040 .destroy_inode
= ext4_destroy_inode
,
1041 .write_inode
= ext4_write_inode
,
1042 .dirty_inode
= ext4_dirty_inode
,
1043 .delete_inode
= ext4_delete_inode
,
1044 .put_super
= ext4_put_super
,
1045 .sync_fs
= ext4_sync_fs
,
1046 .freeze_fs
= ext4_freeze
,
1047 .unfreeze_fs
= ext4_unfreeze
,
1048 .statfs
= ext4_statfs
,
1049 .remount_fs
= ext4_remount
,
1050 .clear_inode
= ext4_clear_inode
,
1051 .show_options
= ext4_show_options
,
1053 .quota_read
= ext4_quota_read
,
1054 .quota_write
= ext4_quota_write
,
1056 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1059 static const struct super_operations ext4_nojournal_sops
= {
1060 .alloc_inode
= ext4_alloc_inode
,
1061 .destroy_inode
= ext4_destroy_inode
,
1062 .write_inode
= ext4_write_inode
,
1063 .dirty_inode
= ext4_dirty_inode
,
1064 .delete_inode
= ext4_delete_inode
,
1065 .write_super
= ext4_write_super
,
1066 .put_super
= ext4_put_super
,
1067 .statfs
= ext4_statfs
,
1068 .remount_fs
= ext4_remount
,
1069 .clear_inode
= ext4_clear_inode
,
1070 .show_options
= ext4_show_options
,
1072 .quota_read
= ext4_quota_read
,
1073 .quota_write
= ext4_quota_write
,
1075 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1078 static const struct export_operations ext4_export_ops
= {
1079 .fh_to_dentry
= ext4_fh_to_dentry
,
1080 .fh_to_parent
= ext4_fh_to_parent
,
1081 .get_parent
= ext4_get_parent
,
1085 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1086 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1087 Opt_nouid32
, Opt_debug
, Opt_oldalloc
, Opt_orlov
,
1088 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1089 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
, Opt_nobh
, Opt_bh
,
1090 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
,
1091 Opt_journal_update
, Opt_journal_dev
,
1092 Opt_journal_checksum
, Opt_journal_async_commit
,
1093 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1094 Opt_data_err_abort
, Opt_data_err_ignore
,
1095 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1096 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_quota
, Opt_noquota
,
1097 Opt_ignore
, Opt_barrier
, Opt_nobarrier
, Opt_err
, Opt_resize
,
1098 Opt_usrquota
, Opt_grpquota
, Opt_i_version
,
1099 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
,
1100 Opt_block_validity
, Opt_noblock_validity
,
1101 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1102 Opt_discard
, Opt_nodiscard
,
1105 static const match_table_t tokens
= {
1106 {Opt_bsd_df
, "bsddf"},
1107 {Opt_minix_df
, "minixdf"},
1108 {Opt_grpid
, "grpid"},
1109 {Opt_grpid
, "bsdgroups"},
1110 {Opt_nogrpid
, "nogrpid"},
1111 {Opt_nogrpid
, "sysvgroups"},
1112 {Opt_resgid
, "resgid=%u"},
1113 {Opt_resuid
, "resuid=%u"},
1115 {Opt_err_cont
, "errors=continue"},
1116 {Opt_err_panic
, "errors=panic"},
1117 {Opt_err_ro
, "errors=remount-ro"},
1118 {Opt_nouid32
, "nouid32"},
1119 {Opt_debug
, "debug"},
1120 {Opt_oldalloc
, "oldalloc"},
1121 {Opt_orlov
, "orlov"},
1122 {Opt_user_xattr
, "user_xattr"},
1123 {Opt_nouser_xattr
, "nouser_xattr"},
1125 {Opt_noacl
, "noacl"},
1126 {Opt_noload
, "noload"},
1127 {Opt_noload
, "norecovery"},
1130 {Opt_commit
, "commit=%u"},
1131 {Opt_min_batch_time
, "min_batch_time=%u"},
1132 {Opt_max_batch_time
, "max_batch_time=%u"},
1133 {Opt_journal_update
, "journal=update"},
1134 {Opt_journal_dev
, "journal_dev=%u"},
1135 {Opt_journal_checksum
, "journal_checksum"},
1136 {Opt_journal_async_commit
, "journal_async_commit"},
1137 {Opt_abort
, "abort"},
1138 {Opt_data_journal
, "data=journal"},
1139 {Opt_data_ordered
, "data=ordered"},
1140 {Opt_data_writeback
, "data=writeback"},
1141 {Opt_data_err_abort
, "data_err=abort"},
1142 {Opt_data_err_ignore
, "data_err=ignore"},
1143 {Opt_offusrjquota
, "usrjquota="},
1144 {Opt_usrjquota
, "usrjquota=%s"},
1145 {Opt_offgrpjquota
, "grpjquota="},
1146 {Opt_grpjquota
, "grpjquota=%s"},
1147 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1148 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1149 {Opt_grpquota
, "grpquota"},
1150 {Opt_noquota
, "noquota"},
1151 {Opt_quota
, "quota"},
1152 {Opt_usrquota
, "usrquota"},
1153 {Opt_barrier
, "barrier=%u"},
1154 {Opt_barrier
, "barrier"},
1155 {Opt_nobarrier
, "nobarrier"},
1156 {Opt_i_version
, "i_version"},
1157 {Opt_stripe
, "stripe=%u"},
1158 {Opt_resize
, "resize"},
1159 {Opt_delalloc
, "delalloc"},
1160 {Opt_nodelalloc
, "nodelalloc"},
1161 {Opt_block_validity
, "block_validity"},
1162 {Opt_noblock_validity
, "noblock_validity"},
1163 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1164 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1165 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1166 {Opt_auto_da_alloc
, "auto_da_alloc"},
1167 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1168 {Opt_discard
, "discard"},
1169 {Opt_nodiscard
, "nodiscard"},
1173 static ext4_fsblk_t
get_sb_block(void **data
)
1175 ext4_fsblk_t sb_block
;
1176 char *options
= (char *) *data
;
1178 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1179 return 1; /* Default location */
1182 /* TODO: use simple_strtoll with >32bit ext4 */
1183 sb_block
= simple_strtoul(options
, &options
, 0);
1184 if (*options
&& *options
!= ',') {
1185 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1189 if (*options
== ',')
1191 *data
= (void *) options
;
1196 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1198 static int parse_options(char *options
, struct super_block
*sb
,
1199 unsigned long *journal_devnum
,
1200 unsigned int *journal_ioprio
,
1201 ext4_fsblk_t
*n_blocks_count
, int is_remount
)
1203 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1205 substring_t args
[MAX_OPT_ARGS
];
1216 while ((p
= strsep(&options
, ",")) != NULL
) {
1222 * Initialize args struct so we know whether arg was
1223 * found; some options take optional arguments.
1225 args
[0].to
= args
[0].from
= 0;
1226 token
= match_token(p
, tokens
, args
);
1229 clear_opt(sbi
->s_mount_opt
, MINIX_DF
);
1232 set_opt(sbi
->s_mount_opt
, MINIX_DF
);
1235 set_opt(sbi
->s_mount_opt
, GRPID
);
1238 clear_opt(sbi
->s_mount_opt
, GRPID
);
1241 if (match_int(&args
[0], &option
))
1243 sbi
->s_resuid
= option
;
1246 if (match_int(&args
[0], &option
))
1248 sbi
->s_resgid
= option
;
1251 /* handled by get_sb_block() instead of here */
1252 /* *sb_block = match_int(&args[0]); */
1255 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1256 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1257 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1260 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1261 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1262 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1265 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1266 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1267 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1270 set_opt(sbi
->s_mount_opt
, NO_UID32
);
1273 set_opt(sbi
->s_mount_opt
, DEBUG
);
1276 set_opt(sbi
->s_mount_opt
, OLDALLOC
);
1279 clear_opt(sbi
->s_mount_opt
, OLDALLOC
);
1281 #ifdef CONFIG_EXT4_FS_XATTR
1282 case Opt_user_xattr
:
1283 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
1285 case Opt_nouser_xattr
:
1286 clear_opt(sbi
->s_mount_opt
, XATTR_USER
);
1289 case Opt_user_xattr
:
1290 case Opt_nouser_xattr
:
1291 ext4_msg(sb
, KERN_ERR
, "(no)user_xattr options not supported");
1294 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1296 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1299 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1304 ext4_msg(sb
, KERN_ERR
, "(no)acl options not supported");
1307 case Opt_journal_update
:
1309 /* Eventually we will want to be able to create
1310 a journal file here. For now, only allow the
1311 user to specify an existing inode to be the
1314 ext4_msg(sb
, KERN_ERR
,
1315 "Cannot specify journal on remount");
1318 set_opt(sbi
->s_mount_opt
, UPDATE_JOURNAL
);
1320 case Opt_journal_dev
:
1322 ext4_msg(sb
, KERN_ERR
,
1323 "Cannot specify journal on remount");
1326 if (match_int(&args
[0], &option
))
1328 *journal_devnum
= option
;
1330 case Opt_journal_checksum
:
1331 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1333 case Opt_journal_async_commit
:
1334 set_opt(sbi
->s_mount_opt
, JOURNAL_ASYNC_COMMIT
);
1335 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1338 set_opt(sbi
->s_mount_opt
, NOLOAD
);
1341 if (match_int(&args
[0], &option
))
1346 option
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1347 sbi
->s_commit_interval
= HZ
* option
;
1349 case Opt_max_batch_time
:
1350 if (match_int(&args
[0], &option
))
1355 option
= EXT4_DEF_MAX_BATCH_TIME
;
1356 sbi
->s_max_batch_time
= option
;
1358 case Opt_min_batch_time
:
1359 if (match_int(&args
[0], &option
))
1363 sbi
->s_min_batch_time
= option
;
1365 case Opt_data_journal
:
1366 data_opt
= EXT4_MOUNT_JOURNAL_DATA
;
1368 case Opt_data_ordered
:
1369 data_opt
= EXT4_MOUNT_ORDERED_DATA
;
1371 case Opt_data_writeback
:
1372 data_opt
= EXT4_MOUNT_WRITEBACK_DATA
;
1375 if ((sbi
->s_mount_opt
& EXT4_MOUNT_DATA_FLAGS
)
1377 ext4_msg(sb
, KERN_ERR
,
1378 "Cannot change data mode on remount");
1382 sbi
->s_mount_opt
&= ~EXT4_MOUNT_DATA_FLAGS
;
1383 sbi
->s_mount_opt
|= data_opt
;
1386 case Opt_data_err_abort
:
1387 set_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1389 case Opt_data_err_ignore
:
1390 clear_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1399 if (sb_any_quota_loaded(sb
) &&
1400 !sbi
->s_qf_names
[qtype
]) {
1401 ext4_msg(sb
, KERN_ERR
,
1402 "Cannot change journaled "
1403 "quota options when quota turned on");
1406 qname
= match_strdup(&args
[0]);
1408 ext4_msg(sb
, KERN_ERR
,
1409 "Not enough memory for "
1410 "storing quotafile name");
1413 if (sbi
->s_qf_names
[qtype
] &&
1414 strcmp(sbi
->s_qf_names
[qtype
], qname
)) {
1415 ext4_msg(sb
, KERN_ERR
,
1416 "%s quota file already "
1417 "specified", QTYPE2NAME(qtype
));
1421 sbi
->s_qf_names
[qtype
] = qname
;
1422 if (strchr(sbi
->s_qf_names
[qtype
], '/')) {
1423 ext4_msg(sb
, KERN_ERR
,
1424 "quotafile must be on "
1426 kfree(sbi
->s_qf_names
[qtype
]);
1427 sbi
->s_qf_names
[qtype
] = NULL
;
1430 set_opt(sbi
->s_mount_opt
, QUOTA
);
1432 case Opt_offusrjquota
:
1435 case Opt_offgrpjquota
:
1438 if (sb_any_quota_loaded(sb
) &&
1439 sbi
->s_qf_names
[qtype
]) {
1440 ext4_msg(sb
, KERN_ERR
, "Cannot change "
1441 "journaled quota options when "
1446 * The space will be released later when all options
1447 * are confirmed to be correct
1449 sbi
->s_qf_names
[qtype
] = NULL
;
1451 case Opt_jqfmt_vfsold
:
1452 qfmt
= QFMT_VFS_OLD
;
1454 case Opt_jqfmt_vfsv0
:
1457 if (sb_any_quota_loaded(sb
) &&
1458 sbi
->s_jquota_fmt
!= qfmt
) {
1459 ext4_msg(sb
, KERN_ERR
, "Cannot change "
1460 "journaled quota options when "
1464 sbi
->s_jquota_fmt
= qfmt
;
1468 set_opt(sbi
->s_mount_opt
, QUOTA
);
1469 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
1472 set_opt(sbi
->s_mount_opt
, QUOTA
);
1473 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1476 if (sb_any_quota_loaded(sb
)) {
1477 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1478 "options when quota turned on");
1481 clear_opt(sbi
->s_mount_opt
, QUOTA
);
1482 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1483 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1489 ext4_msg(sb
, KERN_ERR
,
1490 "quota options not supported");
1494 case Opt_offusrjquota
:
1495 case Opt_offgrpjquota
:
1496 case Opt_jqfmt_vfsold
:
1497 case Opt_jqfmt_vfsv0
:
1498 ext4_msg(sb
, KERN_ERR
,
1499 "journaled quota options not supported");
1505 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1508 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1512 if (match_int(&args
[0], &option
))
1515 option
= 1; /* No argument, default to 1 */
1517 set_opt(sbi
->s_mount_opt
, BARRIER
);
1519 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1525 ext4_msg(sb
, KERN_ERR
,
1526 "resize option only available "
1530 if (match_int(&args
[0], &option
) != 0)
1532 *n_blocks_count
= option
;
1535 set_opt(sbi
->s_mount_opt
, NOBH
);
1538 clear_opt(sbi
->s_mount_opt
, NOBH
);
1541 set_opt(sbi
->s_mount_opt
, I_VERSION
);
1542 sb
->s_flags
|= MS_I_VERSION
;
1544 case Opt_nodelalloc
:
1545 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
1548 if (match_int(&args
[0], &option
))
1552 sbi
->s_stripe
= option
;
1555 set_opt(sbi
->s_mount_opt
, DELALLOC
);
1557 case Opt_block_validity
:
1558 set_opt(sbi
->s_mount_opt
, BLOCK_VALIDITY
);
1560 case Opt_noblock_validity
:
1561 clear_opt(sbi
->s_mount_opt
, BLOCK_VALIDITY
);
1563 case Opt_inode_readahead_blks
:
1564 if (match_int(&args
[0], &option
))
1566 if (option
< 0 || option
> (1 << 30))
1568 if (!is_power_of_2(option
)) {
1569 ext4_msg(sb
, KERN_ERR
,
1570 "EXT4-fs: inode_readahead_blks"
1571 " must be a power of 2");
1574 sbi
->s_inode_readahead_blks
= option
;
1576 case Opt_journal_ioprio
:
1577 if (match_int(&args
[0], &option
))
1579 if (option
< 0 || option
> 7)
1581 *journal_ioprio
= IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
,
1584 case Opt_noauto_da_alloc
:
1585 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1587 case Opt_auto_da_alloc
:
1589 if (match_int(&args
[0], &option
))
1592 option
= 1; /* No argument, default to 1 */
1594 clear_opt(sbi
->s_mount_opt
, NO_AUTO_DA_ALLOC
);
1596 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1599 set_opt(sbi
->s_mount_opt
, DISCARD
);
1602 clear_opt(sbi
->s_mount_opt
, DISCARD
);
1605 ext4_msg(sb
, KERN_ERR
,
1606 "Unrecognized mount option \"%s\" "
1607 "or missing value", p
);
1612 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1613 if ((sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
) &&
1614 sbi
->s_qf_names
[USRQUOTA
])
1615 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1617 if ((sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
) &&
1618 sbi
->s_qf_names
[GRPQUOTA
])
1619 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1621 if ((sbi
->s_qf_names
[USRQUOTA
] &&
1622 (sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
)) ||
1623 (sbi
->s_qf_names
[GRPQUOTA
] &&
1624 (sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
))) {
1625 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1630 if (!sbi
->s_jquota_fmt
) {
1631 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1636 if (sbi
->s_jquota_fmt
) {
1637 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1638 "specified with no journaling "
1647 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1650 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1653 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1654 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
1655 "forcing read-only mode");
1660 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1661 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
1662 "running e2fsck is recommended");
1663 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1664 ext4_msg(sb
, KERN_WARNING
,
1665 "warning: mounting fs with errors, "
1666 "running e2fsck is recommended");
1667 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
1668 le16_to_cpu(es
->s_mnt_count
) >=
1669 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1670 ext4_msg(sb
, KERN_WARNING
,
1671 "warning: maximal mount count reached, "
1672 "running e2fsck is recommended");
1673 else if (le32_to_cpu(es
->s_checkinterval
) &&
1674 (le32_to_cpu(es
->s_lastcheck
) +
1675 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1676 ext4_msg(sb
, KERN_WARNING
,
1677 "warning: checktime reached, "
1678 "running e2fsck is recommended");
1679 if (!sbi
->s_journal
)
1680 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1681 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1682 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1683 le16_add_cpu(&es
->s_mnt_count
, 1);
1684 es
->s_mtime
= cpu_to_le32(get_seconds());
1685 ext4_update_dynamic_rev(sb
);
1687 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1689 ext4_commit_super(sb
, 1);
1690 if (test_opt(sb
, DEBUG
))
1691 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
1692 "bpg=%lu, ipg=%lu, mo=%04x]\n",
1694 sbi
->s_groups_count
,
1695 EXT4_BLOCKS_PER_GROUP(sb
),
1696 EXT4_INODES_PER_GROUP(sb
),
1702 static int ext4_fill_flex_info(struct super_block
*sb
)
1704 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1705 struct ext4_group_desc
*gdp
= NULL
;
1706 ext4_group_t flex_group_count
;
1707 ext4_group_t flex_group
;
1708 int groups_per_flex
= 0;
1712 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1713 groups_per_flex
= 1 << sbi
->s_log_groups_per_flex
;
1715 if (groups_per_flex
< 2) {
1716 sbi
->s_log_groups_per_flex
= 0;
1720 /* We allocate both existing and potentially added groups */
1721 flex_group_count
= ((sbi
->s_groups_count
+ groups_per_flex
- 1) +
1722 ((le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
) + 1) <<
1723 EXT4_DESC_PER_BLOCK_BITS(sb
))) / groups_per_flex
;
1724 size
= flex_group_count
* sizeof(struct flex_groups
);
1725 sbi
->s_flex_groups
= kzalloc(size
, GFP_KERNEL
);
1726 if (sbi
->s_flex_groups
== NULL
) {
1727 sbi
->s_flex_groups
= vmalloc(size
);
1728 if (sbi
->s_flex_groups
)
1729 memset(sbi
->s_flex_groups
, 0, size
);
1731 if (sbi
->s_flex_groups
== NULL
) {
1732 ext4_msg(sb
, KERN_ERR
, "not enough memory for "
1733 "%u flex groups", flex_group_count
);
1737 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1738 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1740 flex_group
= ext4_flex_group(sbi
, i
);
1741 atomic_add(ext4_free_inodes_count(sb
, gdp
),
1742 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
1743 atomic_add(ext4_free_blks_count(sb
, gdp
),
1744 &sbi
->s_flex_groups
[flex_group
].free_blocks
);
1745 atomic_add(ext4_used_dirs_count(sb
, gdp
),
1746 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
1754 __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
1755 struct ext4_group_desc
*gdp
)
1759 if (sbi
->s_es
->s_feature_ro_compat
&
1760 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) {
1761 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
1762 __le32 le_group
= cpu_to_le32(block_group
);
1764 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
1765 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
1766 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
1767 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
1768 /* for checksum of struct ext4_group_desc do the rest...*/
1769 if ((sbi
->s_es
->s_feature_incompat
&
1770 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
1771 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
1772 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
1773 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
1777 return cpu_to_le16(crc
);
1780 int ext4_group_desc_csum_verify(struct ext4_sb_info
*sbi
, __u32 block_group
,
1781 struct ext4_group_desc
*gdp
)
1783 if ((sbi
->s_es
->s_feature_ro_compat
&
1784 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) &&
1785 (gdp
->bg_checksum
!= ext4_group_desc_csum(sbi
, block_group
, gdp
)))
1791 /* Called at mount-time, super-block is locked */
1792 static int ext4_check_descriptors(struct super_block
*sb
)
1794 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1795 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
1796 ext4_fsblk_t last_block
;
1797 ext4_fsblk_t block_bitmap
;
1798 ext4_fsblk_t inode_bitmap
;
1799 ext4_fsblk_t inode_table
;
1800 int flexbg_flag
= 0;
1803 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
1806 ext4_debug("Checking group descriptors");
1808 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1809 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1811 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
1812 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
1814 last_block
= first_block
+
1815 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
1817 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
1818 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
1819 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1820 "Block bitmap for group %u not in group "
1821 "(block %llu)!", i
, block_bitmap
);
1824 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
1825 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
1826 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1827 "Inode bitmap for group %u not in group "
1828 "(block %llu)!", i
, inode_bitmap
);
1831 inode_table
= ext4_inode_table(sb
, gdp
);
1832 if (inode_table
< first_block
||
1833 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
1834 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1835 "Inode table for group %u not in group "
1836 "(block %llu)!", i
, inode_table
);
1839 ext4_lock_group(sb
, i
);
1840 if (!ext4_group_desc_csum_verify(sbi
, i
, gdp
)) {
1841 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1842 "Checksum for group %u failed (%u!=%u)",
1843 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
1844 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
1845 if (!(sb
->s_flags
& MS_RDONLY
)) {
1846 ext4_unlock_group(sb
, i
);
1850 ext4_unlock_group(sb
, i
);
1852 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
1855 ext4_free_blocks_count_set(sbi
->s_es
, ext4_count_free_blocks(sb
));
1856 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
1860 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1861 * the superblock) which were deleted from all directories, but held open by
1862 * a process at the time of a crash. We walk the list and try to delete these
1863 * inodes at recovery time (only with a read-write filesystem).
1865 * In order to keep the orphan inode chain consistent during traversal (in
1866 * case of crash during recovery), we link each inode into the superblock
1867 * orphan list_head and handle it the same way as an inode deletion during
1868 * normal operation (which journals the operations for us).
1870 * We only do an iget() and an iput() on each inode, which is very safe if we
1871 * accidentally point at an in-use or already deleted inode. The worst that
1872 * can happen in this case is that we get a "bit already cleared" message from
1873 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1874 * e2fsck was run on this filesystem, and it must have already done the orphan
1875 * inode cleanup for us, so we can safely abort without any further action.
1877 static void ext4_orphan_cleanup(struct super_block
*sb
,
1878 struct ext4_super_block
*es
)
1880 unsigned int s_flags
= sb
->s_flags
;
1881 int nr_orphans
= 0, nr_truncates
= 0;
1885 if (!es
->s_last_orphan
) {
1886 jbd_debug(4, "no orphan inodes to clean up\n");
1890 if (bdev_read_only(sb
->s_bdev
)) {
1891 ext4_msg(sb
, KERN_ERR
, "write access "
1892 "unavailable, skipping orphan cleanup");
1896 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
1897 if (es
->s_last_orphan
)
1898 jbd_debug(1, "Errors on filesystem, "
1899 "clearing orphan list.\n");
1900 es
->s_last_orphan
= 0;
1901 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1905 if (s_flags
& MS_RDONLY
) {
1906 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
1907 sb
->s_flags
&= ~MS_RDONLY
;
1910 /* Needed for iput() to work correctly and not trash data */
1911 sb
->s_flags
|= MS_ACTIVE
;
1912 /* Turn on quotas so that they are updated correctly */
1913 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1914 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
1915 int ret
= ext4_quota_on_mount(sb
, i
);
1917 ext4_msg(sb
, KERN_ERR
,
1918 "Cannot turn on journaled "
1919 "quota: error %d", ret
);
1924 while (es
->s_last_orphan
) {
1925 struct inode
*inode
;
1927 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
1928 if (IS_ERR(inode
)) {
1929 es
->s_last_orphan
= 0;
1933 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
1935 if (inode
->i_nlink
) {
1936 ext4_msg(sb
, KERN_DEBUG
,
1937 "%s: truncating inode %lu to %lld bytes",
1938 __func__
, inode
->i_ino
, inode
->i_size
);
1939 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
1940 inode
->i_ino
, inode
->i_size
);
1941 ext4_truncate(inode
);
1944 ext4_msg(sb
, KERN_DEBUG
,
1945 "%s: deleting unreferenced inode %lu",
1946 __func__
, inode
->i_ino
);
1947 jbd_debug(2, "deleting unreferenced inode %lu\n",
1951 iput(inode
); /* The delete magic happens here! */
1954 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
1957 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
1958 PLURAL(nr_orphans
));
1960 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
1961 PLURAL(nr_truncates
));
1963 /* Turn quotas off */
1964 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1965 if (sb_dqopt(sb
)->files
[i
])
1966 vfs_quota_off(sb
, i
, 0);
1969 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
1973 * Maximal extent format file size.
1974 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1975 * extent format containers, within a sector_t, and within i_blocks
1976 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1977 * so that won't be a limiting factor.
1979 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1981 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
1984 loff_t upper_limit
= MAX_LFS_FILESIZE
;
1986 /* small i_blocks in vfs inode? */
1987 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
1989 * CONFIG_LBDAF is not enabled implies the inode
1990 * i_block represent total blocks in 512 bytes
1991 * 32 == size of vfs inode i_blocks * 8
1993 upper_limit
= (1LL << 32) - 1;
1995 /* total blocks in file system block size */
1996 upper_limit
>>= (blkbits
- 9);
1997 upper_limit
<<= blkbits
;
2000 /* 32-bit extent-start container, ee_block */
2005 /* Sanity check against vm- & vfs- imposed limits */
2006 if (res
> upper_limit
)
2013 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2014 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2015 * We need to be 1 filesystem block less than the 2^48 sector limit.
2017 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2019 loff_t res
= EXT4_NDIR_BLOCKS
;
2022 /* This is calculated to be the largest file size for a dense, block
2023 * mapped file such that the file's total number of 512-byte sectors,
2024 * including data and all indirect blocks, does not exceed (2^48 - 1).
2026 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2027 * number of 512-byte sectors of the file.
2030 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2032 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2033 * the inode i_block field represents total file blocks in
2034 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2036 upper_limit
= (1LL << 32) - 1;
2038 /* total blocks in file system block size */
2039 upper_limit
>>= (bits
- 9);
2043 * We use 48 bit ext4_inode i_blocks
2044 * With EXT4_HUGE_FILE_FL set the i_blocks
2045 * represent total number of blocks in
2046 * file system block size
2048 upper_limit
= (1LL << 48) - 1;
2052 /* indirect blocks */
2054 /* double indirect blocks */
2055 meta_blocks
+= 1 + (1LL << (bits
-2));
2056 /* tripple indirect blocks */
2057 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2059 upper_limit
-= meta_blocks
;
2060 upper_limit
<<= bits
;
2062 res
+= 1LL << (bits
-2);
2063 res
+= 1LL << (2*(bits
-2));
2064 res
+= 1LL << (3*(bits
-2));
2066 if (res
> upper_limit
)
2069 if (res
> MAX_LFS_FILESIZE
)
2070 res
= MAX_LFS_FILESIZE
;
2075 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2076 ext4_fsblk_t logical_sb_block
, int nr
)
2078 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2079 ext4_group_t bg
, first_meta_bg
;
2082 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2084 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
2086 return logical_sb_block
+ nr
+ 1;
2087 bg
= sbi
->s_desc_per_block
* nr
;
2088 if (ext4_bg_has_super(sb
, bg
))
2091 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2095 * ext4_get_stripe_size: Get the stripe size.
2096 * @sbi: In memory super block info
2098 * If we have specified it via mount option, then
2099 * use the mount option value. If the value specified at mount time is
2100 * greater than the blocks per group use the super block value.
2101 * If the super block value is greater than blocks per group return 0.
2102 * Allocator needs it be less than blocks per group.
2105 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2107 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2108 unsigned long stripe_width
=
2109 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2111 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2112 return sbi
->s_stripe
;
2114 if (stripe_width
<= sbi
->s_blocks_per_group
)
2115 return stripe_width
;
2117 if (stride
<= sbi
->s_blocks_per_group
)
2126 struct attribute attr
;
2127 ssize_t (*show
)(struct ext4_attr
*, struct ext4_sb_info
*, char *);
2128 ssize_t (*store
)(struct ext4_attr
*, struct ext4_sb_info
*,
2129 const char *, size_t);
2133 static int parse_strtoul(const char *buf
,
2134 unsigned long max
, unsigned long *value
)
2138 while (*buf
&& isspace(*buf
))
2140 *value
= simple_strtoul(buf
, &endp
, 0);
2141 while (*endp
&& isspace(*endp
))
2143 if (*endp
|| *value
> max
)
2149 static ssize_t
delayed_allocation_blocks_show(struct ext4_attr
*a
,
2150 struct ext4_sb_info
*sbi
,
2153 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2154 (s64
) percpu_counter_sum(&sbi
->s_dirtyblocks_counter
));
2157 static ssize_t
session_write_kbytes_show(struct ext4_attr
*a
,
2158 struct ext4_sb_info
*sbi
, char *buf
)
2160 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2162 return snprintf(buf
, PAGE_SIZE
, "%lu\n",
2163 (part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2164 sbi
->s_sectors_written_start
) >> 1);
2167 static ssize_t
lifetime_write_kbytes_show(struct ext4_attr
*a
,
2168 struct ext4_sb_info
*sbi
, char *buf
)
2170 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2172 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2173 sbi
->s_kbytes_written
+
2174 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2175 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
2178 static ssize_t
inode_readahead_blks_store(struct ext4_attr
*a
,
2179 struct ext4_sb_info
*sbi
,
2180 const char *buf
, size_t count
)
2184 if (parse_strtoul(buf
, 0x40000000, &t
))
2187 if (!is_power_of_2(t
))
2190 sbi
->s_inode_readahead_blks
= t
;
2194 static ssize_t
sbi_ui_show(struct ext4_attr
*a
,
2195 struct ext4_sb_info
*sbi
, char *buf
)
2197 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2199 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
2202 static ssize_t
sbi_ui_store(struct ext4_attr
*a
,
2203 struct ext4_sb_info
*sbi
,
2204 const char *buf
, size_t count
)
2206 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2209 if (parse_strtoul(buf
, 0xffffffff, &t
))
2215 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2216 static struct ext4_attr ext4_attr_##_name = { \
2217 .attr = {.name = __stringify(_name), .mode = _mode }, \
2220 .offset = offsetof(struct ext4_sb_info, _elname), \
2222 #define EXT4_ATTR(name, mode, show, store) \
2223 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2225 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2226 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2227 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2228 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2229 #define ATTR_LIST(name) &ext4_attr_##name.attr
2231 EXT4_RO_ATTR(delayed_allocation_blocks
);
2232 EXT4_RO_ATTR(session_write_kbytes
);
2233 EXT4_RO_ATTR(lifetime_write_kbytes
);
2234 EXT4_ATTR_OFFSET(inode_readahead_blks
, 0644, sbi_ui_show
,
2235 inode_readahead_blks_store
, s_inode_readahead_blks
);
2236 EXT4_RW_ATTR_SBI_UI(inode_goal
, s_inode_goal
);
2237 EXT4_RW_ATTR_SBI_UI(mb_stats
, s_mb_stats
);
2238 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan
, s_mb_max_to_scan
);
2239 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan
, s_mb_min_to_scan
);
2240 EXT4_RW_ATTR_SBI_UI(mb_order2_req
, s_mb_order2_reqs
);
2241 EXT4_RW_ATTR_SBI_UI(mb_stream_req
, s_mb_stream_request
);
2242 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc
, s_mb_group_prealloc
);
2243 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump
, s_max_writeback_mb_bump
);
2245 static struct attribute
*ext4_attrs
[] = {
2246 ATTR_LIST(delayed_allocation_blocks
),
2247 ATTR_LIST(session_write_kbytes
),
2248 ATTR_LIST(lifetime_write_kbytes
),
2249 ATTR_LIST(inode_readahead_blks
),
2250 ATTR_LIST(inode_goal
),
2251 ATTR_LIST(mb_stats
),
2252 ATTR_LIST(mb_max_to_scan
),
2253 ATTR_LIST(mb_min_to_scan
),
2254 ATTR_LIST(mb_order2_req
),
2255 ATTR_LIST(mb_stream_req
),
2256 ATTR_LIST(mb_group_prealloc
),
2257 ATTR_LIST(max_writeback_mb_bump
),
2261 static ssize_t
ext4_attr_show(struct kobject
*kobj
,
2262 struct attribute
*attr
, char *buf
)
2264 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2266 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2268 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
2271 static ssize_t
ext4_attr_store(struct kobject
*kobj
,
2272 struct attribute
*attr
,
2273 const char *buf
, size_t len
)
2275 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2277 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2279 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
2282 static void ext4_sb_release(struct kobject
*kobj
)
2284 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2286 complete(&sbi
->s_kobj_unregister
);
2290 static struct sysfs_ops ext4_attr_ops
= {
2291 .show
= ext4_attr_show
,
2292 .store
= ext4_attr_store
,
2295 static struct kobj_type ext4_ktype
= {
2296 .default_attrs
= ext4_attrs
,
2297 .sysfs_ops
= &ext4_attr_ops
,
2298 .release
= ext4_sb_release
,
2302 * Check whether this filesystem can be mounted based on
2303 * the features present and the RDONLY/RDWR mount requested.
2304 * Returns 1 if this filesystem can be mounted as requested,
2305 * 0 if it cannot be.
2307 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2309 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
)) {
2310 ext4_msg(sb
, KERN_ERR
,
2311 "Couldn't mount because of "
2312 "unsupported optional features (%x)",
2313 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2314 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2321 /* Check that feature set is OK for a read-write mount */
2322 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
)) {
2323 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2324 "unsupported optional features (%x)",
2325 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2326 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2330 * Large file size enabled file system can only be mounted
2331 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2333 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
2334 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2335 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2336 "cannot be mounted RDWR without "
2344 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
2345 __releases(kernel_lock
)
2346 __acquires(kernel_lock
)
2348 struct buffer_head
*bh
;
2349 struct ext4_super_block
*es
= NULL
;
2350 struct ext4_sb_info
*sbi
;
2352 ext4_fsblk_t sb_block
= get_sb_block(&data
);
2353 ext4_fsblk_t logical_sb_block
;
2354 unsigned long offset
= 0;
2355 unsigned long journal_devnum
= 0;
2356 unsigned long def_mount_opts
;
2362 unsigned int db_count
;
2364 int needs_recovery
, has_huge_files
;
2367 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
2369 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
2373 sbi
->s_blockgroup_lock
=
2374 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
2375 if (!sbi
->s_blockgroup_lock
) {
2379 sb
->s_fs_info
= sbi
;
2380 sbi
->s_mount_opt
= 0;
2381 sbi
->s_resuid
= EXT4_DEF_RESUID
;
2382 sbi
->s_resgid
= EXT4_DEF_RESGID
;
2383 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
2384 sbi
->s_sb_block
= sb_block
;
2385 sbi
->s_sectors_written_start
= part_stat_read(sb
->s_bdev
->bd_part
,
2390 /* Cleanup superblock name */
2391 for (cp
= sb
->s_id
; (cp
= strchr(cp
, '/'));)
2394 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
2396 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
2401 * The ext4 superblock will not be buffer aligned for other than 1kB
2402 * block sizes. We need to calculate the offset from buffer start.
2404 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
2405 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2406 offset
= do_div(logical_sb_block
, blocksize
);
2408 logical_sb_block
= sb_block
;
2411 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
2412 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
2416 * Note: s_es must be initialized as soon as possible because
2417 * some ext4 macro-instructions depend on its value
2419 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
2421 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
2422 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
2424 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
2426 /* Set defaults before we parse the mount options */
2427 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
2428 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
2429 set_opt(sbi
->s_mount_opt
, DEBUG
);
2430 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
2431 set_opt(sbi
->s_mount_opt
, GRPID
);
2432 if (def_mount_opts
& EXT4_DEFM_UID16
)
2433 set_opt(sbi
->s_mount_opt
, NO_UID32
);
2434 #ifdef CONFIG_EXT4_FS_XATTR
2435 if (def_mount_opts
& EXT4_DEFM_XATTR_USER
)
2436 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
2438 #ifdef CONFIG_EXT4_FS_POSIX_ACL
2439 if (def_mount_opts
& EXT4_DEFM_ACL
)
2440 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
2442 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
2443 sbi
->s_mount_opt
|= EXT4_MOUNT_JOURNAL_DATA
;
2444 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
2445 sbi
->s_mount_opt
|= EXT4_MOUNT_ORDERED_DATA
;
2446 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
2447 sbi
->s_mount_opt
|= EXT4_MOUNT_WRITEBACK_DATA
;
2449 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
2450 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
2451 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
2452 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
2454 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
2456 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
2457 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
2458 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
2459 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
2460 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
2462 set_opt(sbi
->s_mount_opt
, BARRIER
);
2465 * enable delayed allocation by default
2466 * Use -o nodelalloc to turn it off
2468 set_opt(sbi
->s_mount_opt
, DELALLOC
);
2470 if (!parse_options((char *) data
, sb
, &journal_devnum
,
2471 &journal_ioprio
, NULL
, 0))
2474 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
2475 ((sbi
->s_mount_opt
& EXT4_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
2477 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
2478 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
2479 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
2480 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
2481 ext4_msg(sb
, KERN_WARNING
,
2482 "feature flags set on rev 0 fs, "
2483 "running e2fsck is recommended");
2486 * Check feature flags regardless of the revision level, since we
2487 * previously didn't change the revision level when setting the flags,
2488 * so there is a chance incompat flags are set on a rev 0 filesystem.
2490 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
2493 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
2495 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
2496 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
2497 ext4_msg(sb
, KERN_ERR
,
2498 "Unsupported filesystem blocksize %d", blocksize
);
2502 if (sb
->s_blocksize
!= blocksize
) {
2503 /* Validate the filesystem blocksize */
2504 if (!sb_set_blocksize(sb
, blocksize
)) {
2505 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
2511 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2512 offset
= do_div(logical_sb_block
, blocksize
);
2513 bh
= sb_bread(sb
, logical_sb_block
);
2515 ext4_msg(sb
, KERN_ERR
,
2516 "Can't read superblock on 2nd try");
2519 es
= (struct ext4_super_block
*)(((char *)bh
->b_data
) + offset
);
2521 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
2522 ext4_msg(sb
, KERN_ERR
,
2523 "Magic mismatch, very weird!");
2528 has_huge_files
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2529 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
);
2530 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
2532 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
2534 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
2535 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
2536 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
2538 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
2539 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
2540 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
2541 (!is_power_of_2(sbi
->s_inode_size
)) ||
2542 (sbi
->s_inode_size
> blocksize
)) {
2543 ext4_msg(sb
, KERN_ERR
,
2544 "unsupported inode size: %d",
2548 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
2549 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
2552 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
2553 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
2554 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
2555 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
2556 !is_power_of_2(sbi
->s_desc_size
)) {
2557 ext4_msg(sb
, KERN_ERR
,
2558 "unsupported descriptor size %lu",
2563 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
2565 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
2566 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
2567 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
2570 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
2571 if (sbi
->s_inodes_per_block
== 0)
2573 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
2574 sbi
->s_inodes_per_block
;
2575 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
2577 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
2578 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
2579 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
2581 for (i
= 0; i
< 4; i
++)
2582 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
2583 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
2584 i
= le32_to_cpu(es
->s_flags
);
2585 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
2586 sbi
->s_hash_unsigned
= 3;
2587 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
2588 #ifdef __CHAR_UNSIGNED__
2589 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
2590 sbi
->s_hash_unsigned
= 3;
2592 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
2597 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
2598 ext4_msg(sb
, KERN_ERR
,
2599 "#blocks per group too big: %lu",
2600 sbi
->s_blocks_per_group
);
2603 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
2604 ext4_msg(sb
, KERN_ERR
,
2605 "#inodes per group too big: %lu",
2606 sbi
->s_inodes_per_group
);
2611 * Test whether we have more sectors than will fit in sector_t,
2612 * and whether the max offset is addressable by the page cache.
2614 if ((ext4_blocks_count(es
) >
2615 (sector_t
)(~0ULL) >> (sb
->s_blocksize_bits
- 9)) ||
2616 (ext4_blocks_count(es
) >
2617 (pgoff_t
)(~0ULL) >> (PAGE_CACHE_SHIFT
- sb
->s_blocksize_bits
))) {
2618 ext4_msg(sb
, KERN_ERR
, "filesystem"
2619 " too large to mount safely on this system");
2620 if (sizeof(sector_t
) < 8)
2621 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
2626 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
2629 /* check blocks count against device size */
2630 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
2631 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
2632 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
2633 "exceeds size of device (%llu blocks)",
2634 ext4_blocks_count(es
), blocks_count
);
2639 * It makes no sense for the first data block to be beyond the end
2640 * of the filesystem.
2642 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
2643 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data"
2644 "block %u is beyond end of filesystem (%llu)",
2645 le32_to_cpu(es
->s_first_data_block
),
2646 ext4_blocks_count(es
));
2649 blocks_count
= (ext4_blocks_count(es
) -
2650 le32_to_cpu(es
->s_first_data_block
) +
2651 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2652 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
2653 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
2654 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
2655 "(block count %llu, first data block %u, "
2656 "blocks per group %lu)", sbi
->s_groups_count
,
2657 ext4_blocks_count(es
),
2658 le32_to_cpu(es
->s_first_data_block
),
2659 EXT4_BLOCKS_PER_GROUP(sb
));
2662 sbi
->s_groups_count
= blocks_count
;
2663 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
2664 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
2665 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
2666 EXT4_DESC_PER_BLOCK(sb
);
2667 sbi
->s_group_desc
= kmalloc(db_count
* sizeof(struct buffer_head
*),
2669 if (sbi
->s_group_desc
== NULL
) {
2670 ext4_msg(sb
, KERN_ERR
, "not enough memory");
2674 #ifdef CONFIG_PROC_FS
2676 sbi
->s_proc
= proc_mkdir(sb
->s_id
, ext4_proc_root
);
2679 bgl_lock_init(sbi
->s_blockgroup_lock
);
2681 for (i
= 0; i
< db_count
; i
++) {
2682 block
= descriptor_loc(sb
, logical_sb_block
, i
);
2683 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
2684 if (!sbi
->s_group_desc
[i
]) {
2685 ext4_msg(sb
, KERN_ERR
,
2686 "can't read group descriptor %d", i
);
2691 if (!ext4_check_descriptors(sb
)) {
2692 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
2695 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
2696 if (!ext4_fill_flex_info(sb
)) {
2697 ext4_msg(sb
, KERN_ERR
,
2698 "unable to initialize "
2699 "flex_bg meta info!");
2703 sbi
->s_gdb_count
= db_count
;
2704 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
2705 spin_lock_init(&sbi
->s_next_gen_lock
);
2707 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
2708 sbi
->s_max_writeback_mb_bump
= 128;
2711 * set up enough so that it can read an inode
2713 if (!test_opt(sb
, NOLOAD
) &&
2714 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
2715 sb
->s_op
= &ext4_sops
;
2717 sb
->s_op
= &ext4_nojournal_sops
;
2718 sb
->s_export_op
= &ext4_export_ops
;
2719 sb
->s_xattr
= ext4_xattr_handlers
;
2721 sb
->s_qcop
= &ext4_qctl_operations
;
2722 sb
->dq_op
= &ext4_quota_operations
;
2724 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
2725 mutex_init(&sbi
->s_orphan_lock
);
2726 mutex_init(&sbi
->s_resize_lock
);
2730 needs_recovery
= (es
->s_last_orphan
!= 0 ||
2731 EXT4_HAS_INCOMPAT_FEATURE(sb
,
2732 EXT4_FEATURE_INCOMPAT_RECOVER
));
2735 * The first inode we look at is the journal inode. Don't try
2736 * root first: it may be modified in the journal!
2738 if (!test_opt(sb
, NOLOAD
) &&
2739 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
2740 if (ext4_load_journal(sb
, es
, journal_devnum
))
2742 if (!(sb
->s_flags
& MS_RDONLY
) &&
2743 EXT4_SB(sb
)->s_journal
->j_failed_commit
) {
2744 ext4_msg(sb
, KERN_CRIT
, "error: "
2745 "ext4_fill_super: Journal transaction "
2747 EXT4_SB(sb
)->s_journal
->j_failed_commit
);
2748 if (test_opt(sb
, ERRORS_RO
)) {
2749 ext4_msg(sb
, KERN_CRIT
,
2750 "Mounting filesystem read-only");
2751 sb
->s_flags
|= MS_RDONLY
;
2752 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
2753 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
2755 if (test_opt(sb
, ERRORS_PANIC
)) {
2756 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
2757 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
2758 ext4_commit_super(sb
, 1);
2762 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
2763 EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
2764 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
2765 "suppressed and not mounted read-only");
2768 clear_opt(sbi
->s_mount_opt
, DATA_FLAGS
);
2769 set_opt(sbi
->s_mount_opt
, WRITEBACK_DATA
);
2770 sbi
->s_journal
= NULL
;
2775 if (ext4_blocks_count(es
) > 0xffffffffULL
&&
2776 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
2777 JBD2_FEATURE_INCOMPAT_64BIT
)) {
2778 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
2782 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
2783 jbd2_journal_set_features(sbi
->s_journal
,
2784 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2785 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2786 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
2787 jbd2_journal_set_features(sbi
->s_journal
,
2788 JBD2_FEATURE_COMPAT_CHECKSUM
, 0, 0);
2789 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
2790 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2792 jbd2_journal_clear_features(sbi
->s_journal
,
2793 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2794 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2797 /* We have now updated the journal if required, so we can
2798 * validate the data journaling mode. */
2799 switch (test_opt(sb
, DATA_FLAGS
)) {
2801 /* No mode set, assume a default based on the journal
2802 * capabilities: ORDERED_DATA if the journal can
2803 * cope, else JOURNAL_DATA
2805 if (jbd2_journal_check_available_features
2806 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
2807 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
2809 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
2812 case EXT4_MOUNT_ORDERED_DATA
:
2813 case EXT4_MOUNT_WRITEBACK_DATA
:
2814 if (!jbd2_journal_check_available_features
2815 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
2816 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
2817 "requested data journaling mode");
2823 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
2826 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
2827 ext4_count_free_blocks(sb
));
2829 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
2830 ext4_count_free_inodes(sb
));
2832 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
2833 ext4_count_dirs(sb
));
2835 err
= percpu_counter_init(&sbi
->s_dirtyblocks_counter
, 0);
2837 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
2838 goto failed_mount_wq
;
2840 if (test_opt(sb
, NOBH
)) {
2841 if (!(test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)) {
2842 ext4_msg(sb
, KERN_WARNING
, "Ignoring nobh option - "
2843 "its supported only with writeback mode");
2844 clear_opt(sbi
->s_mount_opt
, NOBH
);
2847 EXT4_SB(sb
)->dio_unwritten_wq
= create_workqueue("ext4-dio-unwritten");
2848 if (!EXT4_SB(sb
)->dio_unwritten_wq
) {
2849 printk(KERN_ERR
"EXT4-fs: failed to create DIO workqueue\n");
2850 goto failed_mount_wq
;
2854 * The jbd2_journal_load will have done any necessary log recovery,
2855 * so we can safely mount the rest of the filesystem now.
2858 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
2860 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
2861 ret
= PTR_ERR(root
);
2864 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
2866 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
2869 sb
->s_root
= d_alloc_root(root
);
2871 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
2877 ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
);
2879 /* determine the minimum size of new large inodes, if present */
2880 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
2881 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2882 EXT4_GOOD_OLD_INODE_SIZE
;
2883 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2884 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
2885 if (sbi
->s_want_extra_isize
<
2886 le16_to_cpu(es
->s_want_extra_isize
))
2887 sbi
->s_want_extra_isize
=
2888 le16_to_cpu(es
->s_want_extra_isize
);
2889 if (sbi
->s_want_extra_isize
<
2890 le16_to_cpu(es
->s_min_extra_isize
))
2891 sbi
->s_want_extra_isize
=
2892 le16_to_cpu(es
->s_min_extra_isize
);
2895 /* Check if enough inode space is available */
2896 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
2897 sbi
->s_inode_size
) {
2898 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2899 EXT4_GOOD_OLD_INODE_SIZE
;
2900 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
2904 if (test_opt(sb
, DELALLOC
) &&
2905 (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)) {
2906 ext4_msg(sb
, KERN_WARNING
, "Ignoring delalloc option - "
2907 "requested data journaling mode");
2908 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
2911 err
= ext4_setup_system_zone(sb
);
2913 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
2919 err
= ext4_mb_init(sb
, needs_recovery
);
2921 ext4_msg(sb
, KERN_ERR
, "failed to initalize mballoc (%d)",
2926 sbi
->s_kobj
.kset
= ext4_kset
;
2927 init_completion(&sbi
->s_kobj_unregister
);
2928 err
= kobject_init_and_add(&sbi
->s_kobj
, &ext4_ktype
, NULL
,
2931 ext4_mb_release(sb
);
2932 ext4_ext_release(sb
);
2936 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
2937 ext4_orphan_cleanup(sb
, es
);
2938 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
2939 if (needs_recovery
) {
2940 ext4_msg(sb
, KERN_INFO
, "recovery complete");
2941 ext4_mark_recovery_complete(sb
, es
);
2943 if (EXT4_SB(sb
)->s_journal
) {
2944 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
2945 descr
= " journalled data mode";
2946 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
2947 descr
= " ordered data mode";
2949 descr
= " writeback data mode";
2951 descr
= "out journal";
2953 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s", descr
);
2960 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
2964 ext4_msg(sb
, KERN_ERR
, "mount failed");
2965 destroy_workqueue(EXT4_SB(sb
)->dio_unwritten_wq
);
2967 ext4_release_system_zone(sb
);
2968 if (sbi
->s_journal
) {
2969 jbd2_journal_destroy(sbi
->s_journal
);
2970 sbi
->s_journal
= NULL
;
2972 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
2973 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
2974 percpu_counter_destroy(&sbi
->s_dirs_counter
);
2975 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
2977 if (sbi
->s_flex_groups
) {
2978 if (is_vmalloc_addr(sbi
->s_flex_groups
))
2979 vfree(sbi
->s_flex_groups
);
2981 kfree(sbi
->s_flex_groups
);
2984 for (i
= 0; i
< db_count
; i
++)
2985 brelse(sbi
->s_group_desc
[i
]);
2986 kfree(sbi
->s_group_desc
);
2989 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
2992 for (i
= 0; i
< MAXQUOTAS
; i
++)
2993 kfree(sbi
->s_qf_names
[i
]);
2995 ext4_blkdev_remove(sbi
);
2998 sb
->s_fs_info
= NULL
;
2999 kfree(sbi
->s_blockgroup_lock
);
3006 * Setup any per-fs journal parameters now. We'll do this both on
3007 * initial mount, once the journal has been initialised but before we've
3008 * done any recovery; and again on any subsequent remount.
3010 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
3012 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3014 journal
->j_commit_interval
= sbi
->s_commit_interval
;
3015 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
3016 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
3018 spin_lock(&journal
->j_state_lock
);
3019 if (test_opt(sb
, BARRIER
))
3020 journal
->j_flags
|= JBD2_BARRIER
;
3022 journal
->j_flags
&= ~JBD2_BARRIER
;
3023 if (test_opt(sb
, DATA_ERR_ABORT
))
3024 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
3026 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
3027 spin_unlock(&journal
->j_state_lock
);
3030 static journal_t
*ext4_get_journal(struct super_block
*sb
,
3031 unsigned int journal_inum
)
3033 struct inode
*journal_inode
;
3036 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3038 /* First, test for the existence of a valid inode on disk. Bad
3039 * things happen if we iget() an unused inode, as the subsequent
3040 * iput() will try to delete it. */
3042 journal_inode
= ext4_iget(sb
, journal_inum
);
3043 if (IS_ERR(journal_inode
)) {
3044 ext4_msg(sb
, KERN_ERR
, "no journal found");
3047 if (!journal_inode
->i_nlink
) {
3048 make_bad_inode(journal_inode
);
3049 iput(journal_inode
);
3050 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
3054 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3055 journal_inode
, journal_inode
->i_size
);
3056 if (!S_ISREG(journal_inode
->i_mode
)) {
3057 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
3058 iput(journal_inode
);
3062 journal
= jbd2_journal_init_inode(journal_inode
);
3064 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
3065 iput(journal_inode
);
3068 journal
->j_private
= sb
;
3069 ext4_init_journal_params(sb
, journal
);
3073 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
3076 struct buffer_head
*bh
;
3080 int hblock
, blocksize
;
3081 ext4_fsblk_t sb_block
;
3082 unsigned long offset
;
3083 struct ext4_super_block
*es
;
3084 struct block_device
*bdev
;
3086 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3088 bdev
= ext4_blkdev_get(j_dev
, sb
);
3092 if (bd_claim(bdev
, sb
)) {
3093 ext4_msg(sb
, KERN_ERR
,
3094 "failed to claim external journal device");
3095 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
3099 blocksize
= sb
->s_blocksize
;
3100 hblock
= bdev_logical_block_size(bdev
);
3101 if (blocksize
< hblock
) {
3102 ext4_msg(sb
, KERN_ERR
,
3103 "blocksize too small for journal device");
3107 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
3108 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
3109 set_blocksize(bdev
, blocksize
);
3110 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
3111 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
3112 "external journal");
3116 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
3117 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
3118 !(le32_to_cpu(es
->s_feature_incompat
) &
3119 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
3120 ext4_msg(sb
, KERN_ERR
, "external journal has "
3126 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
3127 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
3132 len
= ext4_blocks_count(es
);
3133 start
= sb_block
+ 1;
3134 brelse(bh
); /* we're done with the superblock */
3136 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
3137 start
, len
, blocksize
);
3139 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
3142 journal
->j_private
= sb
;
3143 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
3144 wait_on_buffer(journal
->j_sb_buffer
);
3145 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
3146 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
3149 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
3150 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
3151 "user (unsupported) - %d",
3152 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
3155 EXT4_SB(sb
)->journal_bdev
= bdev
;
3156 ext4_init_journal_params(sb
, journal
);
3160 jbd2_journal_destroy(journal
);
3162 ext4_blkdev_put(bdev
);
3166 static int ext4_load_journal(struct super_block
*sb
,
3167 struct ext4_super_block
*es
,
3168 unsigned long journal_devnum
)
3171 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
3174 int really_read_only
;
3176 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3178 if (journal_devnum
&&
3179 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3180 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
3181 "numbers have changed");
3182 journal_dev
= new_decode_dev(journal_devnum
);
3184 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
3186 really_read_only
= bdev_read_only(sb
->s_bdev
);
3189 * Are we loading a blank journal or performing recovery after a
3190 * crash? For recovery, we need to check in advance whether we
3191 * can get read-write access to the device.
3193 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3194 if (sb
->s_flags
& MS_RDONLY
) {
3195 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
3196 "required on readonly filesystem");
3197 if (really_read_only
) {
3198 ext4_msg(sb
, KERN_ERR
, "write access "
3199 "unavailable, cannot proceed");
3202 ext4_msg(sb
, KERN_INFO
, "write access will "
3203 "be enabled during recovery");
3207 if (journal_inum
&& journal_dev
) {
3208 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
3209 "and inode journals!");
3214 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
3217 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
3221 if (!(journal
->j_flags
& JBD2_BARRIER
))
3222 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
3224 if (!really_read_only
&& test_opt(sb
, UPDATE_JOURNAL
)) {
3225 err
= jbd2_journal_update_format(journal
);
3227 ext4_msg(sb
, KERN_ERR
, "error updating journal");
3228 jbd2_journal_destroy(journal
);
3233 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
3234 err
= jbd2_journal_wipe(journal
, !really_read_only
);
3236 err
= jbd2_journal_load(journal
);
3239 ext4_msg(sb
, KERN_ERR
, "error loading journal");
3240 jbd2_journal_destroy(journal
);
3244 EXT4_SB(sb
)->s_journal
= journal
;
3245 ext4_clear_journal_err(sb
, es
);
3247 if (journal_devnum
&&
3248 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3249 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
3251 /* Make sure we flush the recovery flag to disk. */
3252 ext4_commit_super(sb
, 1);
3258 static int ext4_commit_super(struct super_block
*sb
, int sync
)
3260 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
3261 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
3266 if (buffer_write_io_error(sbh
)) {
3268 * Oh, dear. A previous attempt to write the
3269 * superblock failed. This could happen because the
3270 * USB device was yanked out. Or it could happen to
3271 * be a transient write error and maybe the block will
3272 * be remapped. Nothing we can do but to retry the
3273 * write and hope for the best.
3275 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
3276 "superblock detected");
3277 clear_buffer_write_io_error(sbh
);
3278 set_buffer_uptodate(sbh
);
3281 * If the file system is mounted read-only, don't update the
3282 * superblock write time. This avoids updating the superblock
3283 * write time when we are mounting the root file system
3284 * read/only but we need to replay the journal; at that point,
3285 * for people who are east of GMT and who make their clock
3286 * tick in localtime for Windows bug-for-bug compatibility,
3287 * the clock is set in the future, and this will cause e2fsck
3288 * to complain and force a full file system check.
3290 if (!(sb
->s_flags
& MS_RDONLY
))
3291 es
->s_wtime
= cpu_to_le32(get_seconds());
3292 es
->s_kbytes_written
=
3293 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
3294 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
3295 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
3296 ext4_free_blocks_count_set(es
, percpu_counter_sum_positive(
3297 &EXT4_SB(sb
)->s_freeblocks_counter
));
3298 es
->s_free_inodes_count
= cpu_to_le32(percpu_counter_sum_positive(
3299 &EXT4_SB(sb
)->s_freeinodes_counter
));
3301 BUFFER_TRACE(sbh
, "marking dirty");
3302 mark_buffer_dirty(sbh
);
3304 error
= sync_dirty_buffer(sbh
);
3308 error
= buffer_write_io_error(sbh
);
3310 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
3312 clear_buffer_write_io_error(sbh
);
3313 set_buffer_uptodate(sbh
);
3320 * Have we just finished recovery? If so, and if we are mounting (or
3321 * remounting) the filesystem readonly, then we will end up with a
3322 * consistent fs on disk. Record that fact.
3324 static void ext4_mark_recovery_complete(struct super_block
*sb
,
3325 struct ext4_super_block
*es
)
3327 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
3329 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
3330 BUG_ON(journal
!= NULL
);
3333 jbd2_journal_lock_updates(journal
);
3334 if (jbd2_journal_flush(journal
) < 0)
3337 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
3338 sb
->s_flags
& MS_RDONLY
) {
3339 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3340 ext4_commit_super(sb
, 1);
3344 jbd2_journal_unlock_updates(journal
);
3348 * If we are mounting (or read-write remounting) a filesystem whose journal
3349 * has recorded an error from a previous lifetime, move that error to the
3350 * main filesystem now.
3352 static void ext4_clear_journal_err(struct super_block
*sb
,
3353 struct ext4_super_block
*es
)
3359 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3361 journal
= EXT4_SB(sb
)->s_journal
;
3364 * Now check for any error status which may have been recorded in the
3365 * journal by a prior ext4_error() or ext4_abort()
3368 j_errno
= jbd2_journal_errno(journal
);
3372 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
3373 ext4_warning(sb
, __func__
, "Filesystem error recorded "
3374 "from previous mount: %s", errstr
);
3375 ext4_warning(sb
, __func__
, "Marking fs in need of "
3376 "filesystem check.");
3378 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
3379 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
3380 ext4_commit_super(sb
, 1);
3382 jbd2_journal_clear_err(journal
);
3387 * Force the running and committing transactions to commit,
3388 * and wait on the commit.
3390 int ext4_force_commit(struct super_block
*sb
)
3395 if (sb
->s_flags
& MS_RDONLY
)
3398 journal
= EXT4_SB(sb
)->s_journal
;
3400 vfs_check_frozen(sb
, SB_FREEZE_TRANS
);
3401 ret
= ext4_journal_force_commit(journal
);
3407 static void ext4_write_super(struct super_block
*sb
)
3410 ext4_commit_super(sb
, 1);
3414 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
3418 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3420 trace_ext4_sync_fs(sb
, wait
);
3421 flush_workqueue(sbi
->dio_unwritten_wq
);
3422 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
3424 jbd2_log_wait_commit(sbi
->s_journal
, target
);
3430 * LVM calls this function before a (read-only) snapshot is created. This
3431 * gives us a chance to flush the journal completely and mark the fs clean.
3433 static int ext4_freeze(struct super_block
*sb
)
3438 if (sb
->s_flags
& MS_RDONLY
)
3441 journal
= EXT4_SB(sb
)->s_journal
;
3443 /* Now we set up the journal barrier. */
3444 jbd2_journal_lock_updates(journal
);
3447 * Don't clear the needs_recovery flag if we failed to flush
3450 error
= jbd2_journal_flush(journal
);
3454 /* Journal blocked and flushed, clear needs_recovery flag. */
3455 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3456 error
= ext4_commit_super(sb
, 1);
3458 /* we rely on s_frozen to stop further updates */
3459 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
3464 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3465 * flag here, even though the filesystem is not technically dirty yet.
3467 static int ext4_unfreeze(struct super_block
*sb
)
3469 if (sb
->s_flags
& MS_RDONLY
)
3473 /* Reset the needs_recovery flag before the fs is unlocked. */
3474 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3475 ext4_commit_super(sb
, 1);
3480 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
3482 struct ext4_super_block
*es
;
3483 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3484 ext4_fsblk_t n_blocks_count
= 0;
3485 unsigned long old_sb_flags
;
3486 struct ext4_mount_options old_opts
;
3488 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3496 /* Store the original options */
3498 old_sb_flags
= sb
->s_flags
;
3499 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
3500 old_opts
.s_resuid
= sbi
->s_resuid
;
3501 old_opts
.s_resgid
= sbi
->s_resgid
;
3502 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
3503 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
3504 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
3506 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
3507 for (i
= 0; i
< MAXQUOTAS
; i
++)
3508 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
3510 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
3511 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
3514 * Allow the "check" option to be passed as a remount option.
3516 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
,
3517 &n_blocks_count
, 1)) {
3522 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
3523 ext4_abort(sb
, __func__
, "Abort forced by user");
3525 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3526 ((sbi
->s_mount_opt
& EXT4_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
3530 if (sbi
->s_journal
) {
3531 ext4_init_journal_params(sb
, sbi
->s_journal
);
3532 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
3535 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
) ||
3536 n_blocks_count
> ext4_blocks_count(es
)) {
3537 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
3542 if (*flags
& MS_RDONLY
) {
3544 * First of all, the unconditional stuff we have to do
3545 * to disable replay of the journal when we next remount
3547 sb
->s_flags
|= MS_RDONLY
;
3550 * OK, test if we are remounting a valid rw partition
3551 * readonly, and if so set the rdonly flag and then
3552 * mark the partition as valid again.
3554 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
3555 (sbi
->s_mount_state
& EXT4_VALID_FS
))
3556 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
3559 ext4_mark_recovery_complete(sb
, es
);
3561 /* Make sure we can mount this feature set readwrite */
3562 if (!ext4_feature_set_ok(sb
, 0)) {
3567 * Make sure the group descriptor checksums
3568 * are sane. If they aren't, refuse to remount r/w.
3570 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
3571 struct ext4_group_desc
*gdp
=
3572 ext4_get_group_desc(sb
, g
, NULL
);
3574 if (!ext4_group_desc_csum_verify(sbi
, g
, gdp
)) {
3575 ext4_msg(sb
, KERN_ERR
,
3576 "ext4_remount: Checksum for group %u failed (%u!=%u)",
3577 g
, le16_to_cpu(ext4_group_desc_csum(sbi
, g
, gdp
)),
3578 le16_to_cpu(gdp
->bg_checksum
));
3585 * If we have an unprocessed orphan list hanging
3586 * around from a previously readonly bdev mount,
3587 * require a full umount/remount for now.
3589 if (es
->s_last_orphan
) {
3590 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
3591 "remount RDWR because of unprocessed "
3592 "orphan inode list. Please "
3593 "umount/remount instead");
3599 * Mounting a RDONLY partition read-write, so reread
3600 * and store the current valid flag. (It may have
3601 * been changed by e2fsck since we originally mounted
3605 ext4_clear_journal_err(sb
, es
);
3606 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3607 if ((err
= ext4_group_extend(sb
, es
, n_blocks_count
)))
3609 if (!ext4_setup_super(sb
, es
, 0))
3610 sb
->s_flags
&= ~MS_RDONLY
;
3613 ext4_setup_system_zone(sb
);
3614 if (sbi
->s_journal
== NULL
)
3615 ext4_commit_super(sb
, 1);
3618 /* Release old quota file names */
3619 for (i
= 0; i
< MAXQUOTAS
; i
++)
3620 if (old_opts
.s_qf_names
[i
] &&
3621 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3622 kfree(old_opts
.s_qf_names
[i
]);
3629 sb
->s_flags
= old_sb_flags
;
3630 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
3631 sbi
->s_resuid
= old_opts
.s_resuid
;
3632 sbi
->s_resgid
= old_opts
.s_resgid
;
3633 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
3634 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
3635 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
3637 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
3638 for (i
= 0; i
< MAXQUOTAS
; i
++) {
3639 if (sbi
->s_qf_names
[i
] &&
3640 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3641 kfree(sbi
->s_qf_names
[i
]);
3642 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
3650 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
3652 struct super_block
*sb
= dentry
->d_sb
;
3653 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3654 struct ext4_super_block
*es
= sbi
->s_es
;
3657 if (test_opt(sb
, MINIX_DF
)) {
3658 sbi
->s_overhead_last
= 0;
3659 } else if (sbi
->s_blocks_last
!= ext4_blocks_count(es
)) {
3660 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3661 ext4_fsblk_t overhead
= 0;
3664 * Compute the overhead (FS structures). This is constant
3665 * for a given filesystem unless the number of block groups
3666 * changes so we cache the previous value until it does.
3670 * All of the blocks before first_data_block are
3673 overhead
= le32_to_cpu(es
->s_first_data_block
);
3676 * Add the overhead attributed to the superblock and
3677 * block group descriptors. If the sparse superblocks
3678 * feature is turned on, then not all groups have this.
3680 for (i
= 0; i
< ngroups
; i
++) {
3681 overhead
+= ext4_bg_has_super(sb
, i
) +
3682 ext4_bg_num_gdb(sb
, i
);
3687 * Every block group has an inode bitmap, a block
3688 * bitmap, and an inode table.
3690 overhead
+= ngroups
* (2 + sbi
->s_itb_per_group
);
3691 sbi
->s_overhead_last
= overhead
;
3693 sbi
->s_blocks_last
= ext4_blocks_count(es
);
3696 buf
->f_type
= EXT4_SUPER_MAGIC
;
3697 buf
->f_bsize
= sb
->s_blocksize
;
3698 buf
->f_blocks
= ext4_blocks_count(es
) - sbi
->s_overhead_last
;
3699 buf
->f_bfree
= percpu_counter_sum_positive(&sbi
->s_freeblocks_counter
) -
3700 percpu_counter_sum_positive(&sbi
->s_dirtyblocks_counter
);
3701 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
3702 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
3704 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
3705 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
3706 buf
->f_namelen
= EXT4_NAME_LEN
;
3707 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
3708 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
3709 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
3710 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
3715 /* Helper function for writing quotas on sync - we need to start transaction
3716 * before quota file is locked for write. Otherwise the are possible deadlocks:
3717 * Process 1 Process 2
3718 * ext4_create() quota_sync()
3719 * jbd2_journal_start() write_dquot()
3720 * vfs_dq_init() down(dqio_mutex)
3721 * down(dqio_mutex) jbd2_journal_start()
3727 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
3729 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_type
];
3732 static int ext4_write_dquot(struct dquot
*dquot
)
3736 struct inode
*inode
;
3738 inode
= dquot_to_inode(dquot
);
3739 handle
= ext4_journal_start(inode
,
3740 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
3742 return PTR_ERR(handle
);
3743 ret
= dquot_commit(dquot
);
3744 err
= ext4_journal_stop(handle
);
3750 static int ext4_acquire_dquot(struct dquot
*dquot
)
3755 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3756 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
3758 return PTR_ERR(handle
);
3759 ret
= dquot_acquire(dquot
);
3760 err
= ext4_journal_stop(handle
);
3766 static int ext4_release_dquot(struct dquot
*dquot
)
3771 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3772 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
3773 if (IS_ERR(handle
)) {
3774 /* Release dquot anyway to avoid endless cycle in dqput() */
3775 dquot_release(dquot
);
3776 return PTR_ERR(handle
);
3778 ret
= dquot_release(dquot
);
3779 err
= ext4_journal_stop(handle
);
3785 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
3787 /* Are we journaling quotas? */
3788 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
3789 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
3790 dquot_mark_dquot_dirty(dquot
);
3791 return ext4_write_dquot(dquot
);
3793 return dquot_mark_dquot_dirty(dquot
);
3797 static int ext4_write_info(struct super_block
*sb
, int type
)
3802 /* Data block + inode block */
3803 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
3805 return PTR_ERR(handle
);
3806 ret
= dquot_commit_info(sb
, type
);
3807 err
= ext4_journal_stop(handle
);
3814 * Turn on quotas during mount time - we need to find
3815 * the quota file and such...
3817 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
3819 return vfs_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
3820 EXT4_SB(sb
)->s_jquota_fmt
, type
);
3824 * Standard function to be called on quota_on
3826 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
3827 char *name
, int remount
)
3832 if (!test_opt(sb
, QUOTA
))
3834 /* When remounting, no checks are needed and in fact, name is NULL */
3836 return vfs_quota_on(sb
, type
, format_id
, name
, remount
);
3838 err
= kern_path(name
, LOOKUP_FOLLOW
, &path
);
3842 /* Quotafile not on the same filesystem? */
3843 if (path
.mnt
->mnt_sb
!= sb
) {
3847 /* Journaling quota? */
3848 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
3849 /* Quotafile not in fs root? */
3850 if (path
.dentry
->d_parent
!= sb
->s_root
)
3851 ext4_msg(sb
, KERN_WARNING
,
3852 "Quota file not on filesystem root. "
3853 "Journaled quota will not work");
3857 * When we journal data on quota file, we have to flush journal to see
3858 * all updates to the file when we bypass pagecache...
3860 if (EXT4_SB(sb
)->s_journal
&&
3861 ext4_should_journal_data(path
.dentry
->d_inode
)) {
3863 * We don't need to lock updates but journal_flush() could
3864 * otherwise be livelocked...
3866 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
3867 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
3868 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
3875 err
= vfs_quota_on_path(sb
, type
, format_id
, &path
);
3880 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3881 * acquiring the locks... As quota files are never truncated and quota code
3882 * itself serializes the operations (and noone else should touch the files)
3883 * we don't have to be afraid of races */
3884 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
3885 size_t len
, loff_t off
)
3887 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
3888 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
3890 int offset
= off
& (sb
->s_blocksize
- 1);
3893 struct buffer_head
*bh
;
3894 loff_t i_size
= i_size_read(inode
);
3898 if (off
+len
> i_size
)
3901 while (toread
> 0) {
3902 tocopy
= sb
->s_blocksize
- offset
< toread
?
3903 sb
->s_blocksize
- offset
: toread
;
3904 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
3907 if (!bh
) /* A hole? */
3908 memset(data
, 0, tocopy
);
3910 memcpy(data
, bh
->b_data
+offset
, tocopy
);
3920 /* Write to quotafile (we know the transaction is already started and has
3921 * enough credits) */
3922 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
3923 const char *data
, size_t len
, loff_t off
)
3925 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
3926 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
3928 int offset
= off
& (sb
->s_blocksize
- 1);
3930 int journal_quota
= EXT4_SB(sb
)->s_qf_names
[type
] != NULL
;
3931 size_t towrite
= len
;
3932 struct buffer_head
*bh
;
3933 handle_t
*handle
= journal_current_handle();
3935 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
3936 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
3937 " cancelled because transaction is not started",
3938 (unsigned long long)off
, (unsigned long long)len
);
3941 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
3942 while (towrite
> 0) {
3943 tocopy
= sb
->s_blocksize
- offset
< towrite
?
3944 sb
->s_blocksize
- offset
: towrite
;
3945 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
3948 if (journal_quota
) {
3949 err
= ext4_journal_get_write_access(handle
, bh
);
3956 memcpy(bh
->b_data
+offset
, data
, tocopy
);
3957 flush_dcache_page(bh
->b_page
);
3960 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
3962 /* Always do at least ordered writes for quotas */
3963 err
= ext4_jbd2_file_inode(handle
, inode
);
3964 mark_buffer_dirty(bh
);
3975 if (len
== towrite
) {
3976 mutex_unlock(&inode
->i_mutex
);
3979 if (inode
->i_size
< off
+len
-towrite
) {
3980 i_size_write(inode
, off
+len
-towrite
);
3981 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
3983 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
3984 ext4_mark_inode_dirty(handle
, inode
);
3985 mutex_unlock(&inode
->i_mutex
);
3986 return len
- towrite
;
3991 static int ext4_get_sb(struct file_system_type
*fs_type
, int flags
,
3992 const char *dev_name
, void *data
, struct vfsmount
*mnt
)
3994 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
,mnt
);
3997 static struct file_system_type ext4_fs_type
= {
3998 .owner
= THIS_MODULE
,
4000 .get_sb
= ext4_get_sb
,
4001 .kill_sb
= kill_block_super
,
4002 .fs_flags
= FS_REQUIRES_DEV
,
4005 static int __init
init_ext4_fs(void)
4009 ext4_check_flag_values();
4010 err
= init_ext4_system_zone();
4013 ext4_kset
= kset_create_and_add("ext4", NULL
, fs_kobj
);
4016 ext4_proc_root
= proc_mkdir("fs/ext4", NULL
);
4017 err
= init_ext4_mballoc();
4021 err
= init_ext4_xattr();
4024 err
= init_inodecache();
4027 err
= register_filesystem(&ext4_fs_type
);
4032 destroy_inodecache();
4036 exit_ext4_mballoc();
4038 remove_proc_entry("fs/ext4", NULL
);
4039 kset_unregister(ext4_kset
);
4041 exit_ext4_system_zone();
4045 static void __exit
exit_ext4_fs(void)
4047 unregister_filesystem(&ext4_fs_type
);
4048 destroy_inodecache();
4050 exit_ext4_mballoc();
4051 remove_proc_entry("fs/ext4", NULL
);
4052 kset_unregister(ext4_kset
);
4053 exit_ext4_system_zone();
4056 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4057 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4058 MODULE_LICENSE("GPL");
4059 module_init(init_ext4_fs
)
4060 module_exit(exit_ext4_fs
)