2 * linux/fs/ext4/super.c
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
11 * linux/fs/minix/inode.c
13 * Copyright (C) 1991, 1992 Linus Torvalds
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
19 #include <linux/module.h>
20 #include <linux/string.h>
22 #include <linux/time.h>
23 #include <linux/vmalloc.h>
24 #include <linux/jbd2.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/blkdev.h>
28 #include <linux/parser.h>
29 #include <linux/smp_lock.h>
30 #include <linux/buffer_head.h>
31 #include <linux/exportfs.h>
32 #include <linux/vfs.h>
33 #include <linux/random.h>
34 #include <linux/mount.h>
35 #include <linux/namei.h>
36 #include <linux/quotaops.h>
37 #include <linux/seq_file.h>
38 #include <linux/proc_fs.h>
39 #include <linux/ctype.h>
40 #include <linux/log2.h>
41 #include <linux/crc16.h>
42 #include <asm/uaccess.h>
45 #include "ext4_jbd2.h"
50 #define CREATE_TRACE_POINTS
51 #include <trace/events/ext4.h>
53 struct proc_dir_entry
*ext4_proc_root
;
54 static struct kset
*ext4_kset
;
56 static int ext4_load_journal(struct super_block
*, struct ext4_super_block
*,
57 unsigned long journal_devnum
);
58 static int ext4_commit_super(struct super_block
*sb
, int sync
);
59 static void ext4_mark_recovery_complete(struct super_block
*sb
,
60 struct ext4_super_block
*es
);
61 static void ext4_clear_journal_err(struct super_block
*sb
,
62 struct ext4_super_block
*es
);
63 static int ext4_sync_fs(struct super_block
*sb
, int wait
);
64 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
66 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
);
67 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
);
68 static int ext4_unfreeze(struct super_block
*sb
);
69 static void ext4_write_super(struct super_block
*sb
);
70 static int ext4_freeze(struct super_block
*sb
);
73 ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
74 struct ext4_group_desc
*bg
)
76 return le32_to_cpu(bg
->bg_block_bitmap_lo
) |
77 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
78 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
81 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
82 struct ext4_group_desc
*bg
)
84 return le32_to_cpu(bg
->bg_inode_bitmap_lo
) |
85 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
86 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
89 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
90 struct ext4_group_desc
*bg
)
92 return le32_to_cpu(bg
->bg_inode_table_lo
) |
93 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
94 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
97 __u32
ext4_free_blks_count(struct super_block
*sb
,
98 struct ext4_group_desc
*bg
)
100 return le16_to_cpu(bg
->bg_free_blocks_count_lo
) |
101 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
102 (__u32
)le16_to_cpu(bg
->bg_free_blocks_count_hi
) << 16 : 0);
105 __u32
ext4_free_inodes_count(struct super_block
*sb
,
106 struct ext4_group_desc
*bg
)
108 return le16_to_cpu(bg
->bg_free_inodes_count_lo
) |
109 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
110 (__u32
)le16_to_cpu(bg
->bg_free_inodes_count_hi
) << 16 : 0);
113 __u32
ext4_used_dirs_count(struct super_block
*sb
,
114 struct ext4_group_desc
*bg
)
116 return le16_to_cpu(bg
->bg_used_dirs_count_lo
) |
117 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
118 (__u32
)le16_to_cpu(bg
->bg_used_dirs_count_hi
) << 16 : 0);
121 __u32
ext4_itable_unused_count(struct super_block
*sb
,
122 struct ext4_group_desc
*bg
)
124 return le16_to_cpu(bg
->bg_itable_unused_lo
) |
125 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
126 (__u32
)le16_to_cpu(bg
->bg_itable_unused_hi
) << 16 : 0);
129 void ext4_block_bitmap_set(struct super_block
*sb
,
130 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
132 bg
->bg_block_bitmap_lo
= cpu_to_le32((u32
)blk
);
133 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
134 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
137 void ext4_inode_bitmap_set(struct super_block
*sb
,
138 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
140 bg
->bg_inode_bitmap_lo
= cpu_to_le32((u32
)blk
);
141 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
142 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
145 void ext4_inode_table_set(struct super_block
*sb
,
146 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
148 bg
->bg_inode_table_lo
= cpu_to_le32((u32
)blk
);
149 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
150 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
153 void ext4_free_blks_set(struct super_block
*sb
,
154 struct ext4_group_desc
*bg
, __u32 count
)
156 bg
->bg_free_blocks_count_lo
= cpu_to_le16((__u16
)count
);
157 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
158 bg
->bg_free_blocks_count_hi
= cpu_to_le16(count
>> 16);
161 void ext4_free_inodes_set(struct super_block
*sb
,
162 struct ext4_group_desc
*bg
, __u32 count
)
164 bg
->bg_free_inodes_count_lo
= cpu_to_le16((__u16
)count
);
165 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
166 bg
->bg_free_inodes_count_hi
= cpu_to_le16(count
>> 16);
169 void ext4_used_dirs_set(struct super_block
*sb
,
170 struct ext4_group_desc
*bg
, __u32 count
)
172 bg
->bg_used_dirs_count_lo
= cpu_to_le16((__u16
)count
);
173 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
174 bg
->bg_used_dirs_count_hi
= cpu_to_le16(count
>> 16);
177 void ext4_itable_unused_set(struct super_block
*sb
,
178 struct ext4_group_desc
*bg
, __u32 count
)
180 bg
->bg_itable_unused_lo
= cpu_to_le16((__u16
)count
);
181 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
182 bg
->bg_itable_unused_hi
= cpu_to_le16(count
>> 16);
186 /* Just increment the non-pointer handle value */
187 static handle_t
*ext4_get_nojournal(void)
189 handle_t
*handle
= current
->journal_info
;
190 unsigned long ref_cnt
= (unsigned long)handle
;
192 BUG_ON(ref_cnt
>= EXT4_NOJOURNAL_MAX_REF_COUNT
);
195 handle
= (handle_t
*)ref_cnt
;
197 current
->journal_info
= handle
;
202 /* Decrement the non-pointer handle value */
203 static void ext4_put_nojournal(handle_t
*handle
)
205 unsigned long ref_cnt
= (unsigned long)handle
;
207 BUG_ON(ref_cnt
== 0);
210 handle
= (handle_t
*)ref_cnt
;
212 current
->journal_info
= handle
;
216 * Wrappers for jbd2_journal_start/end.
218 * The only special thing we need to do here is to make sure that all
219 * journal_end calls result in the superblock being marked dirty, so
220 * that sync() will call the filesystem's write_super callback if
223 handle_t
*ext4_journal_start_sb(struct super_block
*sb
, int nblocks
)
227 if (sb
->s_flags
& MS_RDONLY
)
228 return ERR_PTR(-EROFS
);
230 /* Special case here: if the journal has aborted behind our
231 * backs (eg. EIO in the commit thread), then we still need to
232 * take the FS itself readonly cleanly. */
233 journal
= EXT4_SB(sb
)->s_journal
;
235 if (is_journal_aborted(journal
)) {
236 ext4_abort(sb
, __func__
, "Detected aborted journal");
237 return ERR_PTR(-EROFS
);
239 return jbd2_journal_start(journal
, nblocks
);
241 return ext4_get_nojournal();
245 * The only special thing we need to do here is to make sure that all
246 * jbd2_journal_stop calls result in the superblock being marked dirty, so
247 * that sync() will call the filesystem's write_super callback if
250 int __ext4_journal_stop(const char *where
, handle_t
*handle
)
252 struct super_block
*sb
;
256 if (!ext4_handle_valid(handle
)) {
257 ext4_put_nojournal(handle
);
260 sb
= handle
->h_transaction
->t_journal
->j_private
;
262 rc
= jbd2_journal_stop(handle
);
267 __ext4_std_error(sb
, where
, err
);
271 void ext4_journal_abort_handle(const char *caller
, const char *err_fn
,
272 struct buffer_head
*bh
, handle_t
*handle
, int err
)
275 const char *errstr
= ext4_decode_error(NULL
, err
, nbuf
);
277 BUG_ON(!ext4_handle_valid(handle
));
280 BUFFER_TRACE(bh
, "abort");
285 if (is_handle_aborted(handle
))
288 printk(KERN_ERR
"%s: aborting transaction: %s in %s\n",
289 caller
, errstr
, err_fn
);
291 jbd2_journal_abort_handle(handle
);
294 /* Deal with the reporting of failure conditions on a filesystem such as
295 * inconsistencies detected or read IO failures.
297 * On ext2, we can store the error state of the filesystem in the
298 * superblock. That is not possible on ext4, because we may have other
299 * write ordering constraints on the superblock which prevent us from
300 * writing it out straight away; and given that the journal is about to
301 * be aborted, we can't rely on the current, or future, transactions to
302 * write out the superblock safely.
304 * We'll just use the jbd2_journal_abort() error code to record an error in
305 * the journal instead. On recovery, the journal will compain about
306 * that error until we've noted it down and cleared it.
309 static void ext4_handle_error(struct super_block
*sb
)
311 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
313 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
314 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
316 if (sb
->s_flags
& MS_RDONLY
)
319 if (!test_opt(sb
, ERRORS_CONT
)) {
320 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
322 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
324 jbd2_journal_abort(journal
, -EIO
);
326 if (test_opt(sb
, ERRORS_RO
)) {
327 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
328 sb
->s_flags
|= MS_RDONLY
;
330 ext4_commit_super(sb
, 1);
331 if (test_opt(sb
, ERRORS_PANIC
))
332 panic("EXT4-fs (device %s): panic forced after error\n",
336 void ext4_error(struct super_block
*sb
, const char *function
,
337 const char *fmt
, ...)
342 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
347 ext4_handle_error(sb
);
350 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
357 errstr
= "IO failure";
360 errstr
= "Out of memory";
363 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
364 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
365 errstr
= "Journal has aborted";
367 errstr
= "Readonly filesystem";
370 /* If the caller passed in an extra buffer for unknown
371 * errors, textualise them now. Else we just return
374 /* Check for truncated error codes... */
375 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
384 /* __ext4_std_error decodes expected errors from journaling functions
385 * automatically and invokes the appropriate error response. */
387 void __ext4_std_error(struct super_block
*sb
, const char *function
, int errno
)
392 /* Special case: if the error is EROFS, and we're not already
393 * inside a transaction, then there's really no point in logging
395 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
396 (sb
->s_flags
& MS_RDONLY
))
399 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
400 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s: %s\n",
401 sb
->s_id
, function
, errstr
);
403 ext4_handle_error(sb
);
407 * ext4_abort is a much stronger failure handler than ext4_error. The
408 * abort function may be used to deal with unrecoverable failures such
409 * as journal IO errors or ENOMEM at a critical moment in log management.
411 * We unconditionally force the filesystem into an ABORT|READONLY state,
412 * unless the error response on the fs has been set to panic in which
413 * case we take the easy way out and panic immediately.
416 void ext4_abort(struct super_block
*sb
, const char *function
,
417 const char *fmt
, ...)
422 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
427 if (test_opt(sb
, ERRORS_PANIC
))
428 panic("EXT4-fs panic from previous error\n");
430 if (sb
->s_flags
& MS_RDONLY
)
433 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
434 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
435 sb
->s_flags
|= MS_RDONLY
;
436 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
437 if (EXT4_SB(sb
)->s_journal
)
438 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
441 void ext4_msg (struct super_block
* sb
, const char *prefix
,
442 const char *fmt
, ...)
447 printk("%sEXT4-fs (%s): ", prefix
, sb
->s_id
);
453 void ext4_warning(struct super_block
*sb
, const char *function
,
454 const char *fmt
, ...)
459 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s: ",
466 void ext4_grp_locked_error(struct super_block
*sb
, ext4_group_t grp
,
467 const char *function
, const char *fmt
, ...)
472 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
475 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
480 if (test_opt(sb
, ERRORS_CONT
)) {
481 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
482 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
483 ext4_commit_super(sb
, 0);
486 ext4_unlock_group(sb
, grp
);
487 ext4_handle_error(sb
);
489 * We only get here in the ERRORS_RO case; relocking the group
490 * may be dangerous, but nothing bad will happen since the
491 * filesystem will have already been marked read/only and the
492 * journal has been aborted. We return 1 as a hint to callers
493 * who might what to use the return value from
494 * ext4_grp_locked_error() to distinguish beween the
495 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
496 * aggressively from the ext4 function in question, with a
497 * more appropriate error code.
499 ext4_lock_group(sb
, grp
);
503 void ext4_update_dynamic_rev(struct super_block
*sb
)
505 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
507 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
510 ext4_warning(sb
, __func__
,
511 "updating to rev %d because of new feature flag, "
512 "running e2fsck is recommended",
515 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
516 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
517 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
518 /* leave es->s_feature_*compat flags alone */
519 /* es->s_uuid will be set by e2fsck if empty */
522 * The rest of the superblock fields should be zero, and if not it
523 * means they are likely already in use, so leave them alone. We
524 * can leave it up to e2fsck to clean up any inconsistencies there.
529 * Open the external journal device
531 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
533 struct block_device
*bdev
;
534 char b
[BDEVNAME_SIZE
];
536 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
542 ext4_msg(sb
, KERN_ERR
, "failed to open journal device %s: %ld",
543 __bdevname(dev
, b
), PTR_ERR(bdev
));
548 * Release the journal device
550 static int ext4_blkdev_put(struct block_device
*bdev
)
553 return blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
556 static int ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
558 struct block_device
*bdev
;
561 bdev
= sbi
->journal_bdev
;
563 ret
= ext4_blkdev_put(bdev
);
564 sbi
->journal_bdev
= NULL
;
569 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
571 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
574 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
578 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
579 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
581 printk(KERN_ERR
"sb_info orphan list:\n");
582 list_for_each(l
, &sbi
->s_orphan
) {
583 struct inode
*inode
= orphan_list_entry(l
);
585 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
586 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
587 inode
->i_mode
, inode
->i_nlink
,
592 static void ext4_put_super(struct super_block
*sb
)
594 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
595 struct ext4_super_block
*es
= sbi
->s_es
;
598 flush_workqueue(sbi
->dio_unwritten_wq
);
599 destroy_workqueue(sbi
->dio_unwritten_wq
);
604 ext4_commit_super(sb
, 1);
606 if (sbi
->s_journal
) {
607 err
= jbd2_journal_destroy(sbi
->s_journal
);
608 sbi
->s_journal
= NULL
;
610 ext4_abort(sb
, __func__
,
611 "Couldn't clean up the journal");
614 ext4_release_system_zone(sb
);
616 ext4_ext_release(sb
);
617 ext4_xattr_put_super(sb
);
619 if (!(sb
->s_flags
& MS_RDONLY
)) {
620 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
621 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
622 ext4_commit_super(sb
, 1);
625 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
627 kobject_del(&sbi
->s_kobj
);
629 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
630 brelse(sbi
->s_group_desc
[i
]);
631 kfree(sbi
->s_group_desc
);
632 if (is_vmalloc_addr(sbi
->s_flex_groups
))
633 vfree(sbi
->s_flex_groups
);
635 kfree(sbi
->s_flex_groups
);
636 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
637 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
638 percpu_counter_destroy(&sbi
->s_dirs_counter
);
639 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
642 for (i
= 0; i
< MAXQUOTAS
; i
++)
643 kfree(sbi
->s_qf_names
[i
]);
646 /* Debugging code just in case the in-memory inode orphan list
647 * isn't empty. The on-disk one can be non-empty if we've
648 * detected an error and taken the fs readonly, but the
649 * in-memory list had better be clean by this point. */
650 if (!list_empty(&sbi
->s_orphan
))
651 dump_orphan_list(sb
, sbi
);
652 J_ASSERT(list_empty(&sbi
->s_orphan
));
654 invalidate_bdev(sb
->s_bdev
);
655 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
657 * Invalidate the journal device's buffers. We don't want them
658 * floating about in memory - the physical journal device may
659 * hotswapped, and it breaks the `ro-after' testing code.
661 sync_blockdev(sbi
->journal_bdev
);
662 invalidate_bdev(sbi
->journal_bdev
);
663 ext4_blkdev_remove(sbi
);
665 sb
->s_fs_info
= NULL
;
667 * Now that we are completely done shutting down the
668 * superblock, we need to actually destroy the kobject.
672 kobject_put(&sbi
->s_kobj
);
673 wait_for_completion(&sbi
->s_kobj_unregister
);
674 kfree(sbi
->s_blockgroup_lock
);
678 static struct kmem_cache
*ext4_inode_cachep
;
681 * Called inside transaction, so use GFP_NOFS
683 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
685 struct ext4_inode_info
*ei
;
687 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
691 ei
->vfs_inode
.i_version
= 1;
692 ei
->vfs_inode
.i_data
.writeback_index
= 0;
693 memset(&ei
->i_cached_extent
, 0, sizeof(struct ext4_ext_cache
));
694 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
695 spin_lock_init(&ei
->i_prealloc_lock
);
697 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
698 * therefore it can be null here. Don't check it, just initialize
701 jbd2_journal_init_jbd_inode(&ei
->jinode
, &ei
->vfs_inode
);
702 ei
->i_reserved_data_blocks
= 0;
703 ei
->i_reserved_meta_blocks
= 0;
704 ei
->i_allocated_meta_blocks
= 0;
705 ei
->i_da_metadata_calc_len
= 0;
706 ei
->i_delalloc_reserved_flag
= 0;
707 spin_lock_init(&(ei
->i_block_reservation_lock
));
709 ei
->i_reserved_quota
= 0;
711 INIT_LIST_HEAD(&ei
->i_aio_dio_complete_list
);
712 ei
->cur_aio_dio
= NULL
;
714 ei
->i_datasync_tid
= 0;
716 return &ei
->vfs_inode
;
719 static void ext4_destroy_inode(struct inode
*inode
)
721 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
722 ext4_msg(inode
->i_sb
, KERN_ERR
,
723 "Inode %lu (%p): orphan list check failed!",
724 inode
->i_ino
, EXT4_I(inode
));
725 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
726 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
730 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
733 static void init_once(void *foo
)
735 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
737 INIT_LIST_HEAD(&ei
->i_orphan
);
738 #ifdef CONFIG_EXT4_FS_XATTR
739 init_rwsem(&ei
->xattr_sem
);
741 init_rwsem(&ei
->i_data_sem
);
742 inode_init_once(&ei
->vfs_inode
);
745 static int init_inodecache(void)
747 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
748 sizeof(struct ext4_inode_info
),
749 0, (SLAB_RECLAIM_ACCOUNT
|
752 if (ext4_inode_cachep
== NULL
)
757 static void destroy_inodecache(void)
759 kmem_cache_destroy(ext4_inode_cachep
);
762 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
) {
780 switch (sbi
->s_jquota_fmt
) {
791 seq_printf(seq
, ",jqfmt=%s", fmtname
);
794 if (sbi
->s_qf_names
[USRQUOTA
])
795 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
797 if (sbi
->s_qf_names
[GRPQUOTA
])
798 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
800 if (sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
)
801 seq_puts(seq
, ",usrquota");
803 if (sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
)
804 seq_puts(seq
, ",grpquota");
810 * - it's set to a non-default value OR
811 * - if the per-sb default is different from the global default
813 static int ext4_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
816 unsigned long def_mount_opts
;
817 struct super_block
*sb
= vfs
->mnt_sb
;
818 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
819 struct ext4_super_block
*es
= sbi
->s_es
;
821 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
822 def_errors
= le16_to_cpu(es
->s_errors
);
824 if (sbi
->s_sb_block
!= 1)
825 seq_printf(seq
, ",sb=%llu", sbi
->s_sb_block
);
826 if (test_opt(sb
, MINIX_DF
))
827 seq_puts(seq
, ",minixdf");
828 if (test_opt(sb
, GRPID
) && !(def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
829 seq_puts(seq
, ",grpid");
830 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
831 seq_puts(seq
, ",nogrpid");
832 if (sbi
->s_resuid
!= EXT4_DEF_RESUID
||
833 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
) {
834 seq_printf(seq
, ",resuid=%u", sbi
->s_resuid
);
836 if (sbi
->s_resgid
!= EXT4_DEF_RESGID
||
837 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
) {
838 seq_printf(seq
, ",resgid=%u", sbi
->s_resgid
);
840 if (test_opt(sb
, ERRORS_RO
)) {
841 if (def_errors
== EXT4_ERRORS_PANIC
||
842 def_errors
== EXT4_ERRORS_CONTINUE
) {
843 seq_puts(seq
, ",errors=remount-ro");
846 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
847 seq_puts(seq
, ",errors=continue");
848 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
849 seq_puts(seq
, ",errors=panic");
850 if (test_opt(sb
, NO_UID32
) && !(def_mount_opts
& EXT4_DEFM_UID16
))
851 seq_puts(seq
, ",nouid32");
852 if (test_opt(sb
, DEBUG
) && !(def_mount_opts
& EXT4_DEFM_DEBUG
))
853 seq_puts(seq
, ",debug");
854 if (test_opt(sb
, OLDALLOC
))
855 seq_puts(seq
, ",oldalloc");
856 #ifdef CONFIG_EXT4_FS_XATTR
857 if (test_opt(sb
, XATTR_USER
) &&
858 !(def_mount_opts
& EXT4_DEFM_XATTR_USER
))
859 seq_puts(seq
, ",user_xattr");
860 if (!test_opt(sb
, XATTR_USER
) &&
861 (def_mount_opts
& EXT4_DEFM_XATTR_USER
)) {
862 seq_puts(seq
, ",nouser_xattr");
865 #ifdef CONFIG_EXT4_FS_POSIX_ACL
866 if (test_opt(sb
, POSIX_ACL
) && !(def_mount_opts
& EXT4_DEFM_ACL
))
867 seq_puts(seq
, ",acl");
868 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT4_DEFM_ACL
))
869 seq_puts(seq
, ",noacl");
871 if (sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
) {
872 seq_printf(seq
, ",commit=%u",
873 (unsigned) (sbi
->s_commit_interval
/ HZ
));
875 if (sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
) {
876 seq_printf(seq
, ",min_batch_time=%u",
877 (unsigned) sbi
->s_min_batch_time
);
879 if (sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
) {
880 seq_printf(seq
, ",max_batch_time=%u",
881 (unsigned) sbi
->s_min_batch_time
);
885 * We're changing the default of barrier mount option, so
886 * let's always display its mount state so it's clear what its
889 seq_puts(seq
, ",barrier=");
890 seq_puts(seq
, test_opt(sb
, BARRIER
) ? "1" : "0");
891 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
))
892 seq_puts(seq
, ",journal_async_commit");
893 if (test_opt(sb
, NOBH
))
894 seq_puts(seq
, ",nobh");
895 if (test_opt(sb
, I_VERSION
))
896 seq_puts(seq
, ",i_version");
897 if (!test_opt(sb
, DELALLOC
))
898 seq_puts(seq
, ",nodelalloc");
902 seq_printf(seq
, ",stripe=%lu", sbi
->s_stripe
);
904 * journal mode get enabled in different ways
905 * So just print the value even if we didn't specify it
907 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
908 seq_puts(seq
, ",data=journal");
909 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
910 seq_puts(seq
, ",data=ordered");
911 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
912 seq_puts(seq
, ",data=writeback");
914 if (sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
915 seq_printf(seq
, ",inode_readahead_blks=%u",
916 sbi
->s_inode_readahead_blks
);
918 if (test_opt(sb
, DATA_ERR_ABORT
))
919 seq_puts(seq
, ",data_err=abort");
921 if (test_opt(sb
, NO_AUTO_DA_ALLOC
))
922 seq_puts(seq
, ",noauto_da_alloc");
924 if (test_opt(sb
, DISCARD
))
925 seq_puts(seq
, ",discard");
927 if (test_opt(sb
, NOLOAD
))
928 seq_puts(seq
, ",norecovery");
930 ext4_show_quota_options(seq
, sb
);
935 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
936 u64 ino
, u32 generation
)
940 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
941 return ERR_PTR(-ESTALE
);
942 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
943 return ERR_PTR(-ESTALE
);
945 /* iget isn't really right if the inode is currently unallocated!!
947 * ext4_read_inode will return a bad_inode if the inode had been
948 * deleted, so we should be safe.
950 * Currently we don't know the generation for parent directory, so
951 * a generation of 0 means "accept any"
953 inode
= ext4_iget(sb
, ino
);
955 return ERR_CAST(inode
);
956 if (generation
&& inode
->i_generation
!= generation
) {
958 return ERR_PTR(-ESTALE
);
964 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
965 int fh_len
, int fh_type
)
967 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
971 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
972 int fh_len
, int fh_type
)
974 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
979 * Try to release metadata pages (indirect blocks, directories) which are
980 * mapped via the block device. Since these pages could have journal heads
981 * which would prevent try_to_free_buffers() from freeing them, we must use
982 * jbd2 layer's try_to_free_buffers() function to release them.
984 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
987 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
989 WARN_ON(PageChecked(page
));
990 if (!page_has_buffers(page
))
993 return jbd2_journal_try_to_free_buffers(journal
, page
,
995 return try_to_free_buffers(page
);
999 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1000 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1002 static int ext4_write_dquot(struct dquot
*dquot
);
1003 static int ext4_acquire_dquot(struct dquot
*dquot
);
1004 static int ext4_release_dquot(struct dquot
*dquot
);
1005 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1006 static int ext4_write_info(struct super_block
*sb
, int type
);
1007 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1008 char *path
, int remount
);
1009 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1010 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1011 size_t len
, loff_t off
);
1012 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1013 const char *data
, size_t len
, loff_t off
);
1015 static const struct dquot_operations ext4_quota_operations
= {
1017 .get_reserved_space
= ext4_get_reserved_space
,
1019 .write_dquot
= ext4_write_dquot
,
1020 .acquire_dquot
= ext4_acquire_dquot
,
1021 .release_dquot
= ext4_release_dquot
,
1022 .mark_dirty
= ext4_mark_dquot_dirty
,
1023 .write_info
= ext4_write_info
,
1024 .alloc_dquot
= dquot_alloc
,
1025 .destroy_dquot
= dquot_destroy
,
1028 static const struct quotactl_ops ext4_qctl_operations
= {
1029 .quota_on
= ext4_quota_on
,
1030 .quota_off
= vfs_quota_off
,
1031 .quota_sync
= vfs_quota_sync
,
1032 .get_info
= vfs_get_dqinfo
,
1033 .set_info
= vfs_set_dqinfo
,
1034 .get_dqblk
= vfs_get_dqblk
,
1035 .set_dqblk
= vfs_set_dqblk
1039 static const struct super_operations ext4_sops
= {
1040 .alloc_inode
= ext4_alloc_inode
,
1041 .destroy_inode
= ext4_destroy_inode
,
1042 .write_inode
= ext4_write_inode
,
1043 .dirty_inode
= ext4_dirty_inode
,
1044 .delete_inode
= ext4_delete_inode
,
1045 .put_super
= ext4_put_super
,
1046 .sync_fs
= ext4_sync_fs
,
1047 .freeze_fs
= ext4_freeze
,
1048 .unfreeze_fs
= ext4_unfreeze
,
1049 .statfs
= ext4_statfs
,
1050 .remount_fs
= ext4_remount
,
1051 .clear_inode
= ext4_clear_inode
,
1052 .show_options
= ext4_show_options
,
1054 .quota_read
= ext4_quota_read
,
1055 .quota_write
= ext4_quota_write
,
1057 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1060 static const struct super_operations ext4_nojournal_sops
= {
1061 .alloc_inode
= ext4_alloc_inode
,
1062 .destroy_inode
= ext4_destroy_inode
,
1063 .write_inode
= ext4_write_inode
,
1064 .dirty_inode
= ext4_dirty_inode
,
1065 .delete_inode
= ext4_delete_inode
,
1066 .write_super
= ext4_write_super
,
1067 .put_super
= ext4_put_super
,
1068 .statfs
= ext4_statfs
,
1069 .remount_fs
= ext4_remount
,
1070 .clear_inode
= ext4_clear_inode
,
1071 .show_options
= ext4_show_options
,
1073 .quota_read
= ext4_quota_read
,
1074 .quota_write
= ext4_quota_write
,
1076 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1079 static const struct export_operations ext4_export_ops
= {
1080 .fh_to_dentry
= ext4_fh_to_dentry
,
1081 .fh_to_parent
= ext4_fh_to_parent
,
1082 .get_parent
= ext4_get_parent
,
1086 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1087 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1088 Opt_nouid32
, Opt_debug
, Opt_oldalloc
, Opt_orlov
,
1089 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1090 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
, Opt_nobh
, Opt_bh
,
1091 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
,
1092 Opt_journal_update
, Opt_journal_dev
,
1093 Opt_journal_checksum
, Opt_journal_async_commit
,
1094 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1095 Opt_data_err_abort
, Opt_data_err_ignore
,
1096 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1097 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1098 Opt_noquota
, Opt_ignore
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1099 Opt_resize
, Opt_usrquota
, Opt_grpquota
, Opt_i_version
,
1100 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
,
1101 Opt_block_validity
, Opt_noblock_validity
,
1102 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1103 Opt_discard
, Opt_nodiscard
,
1106 static const match_table_t tokens
= {
1107 {Opt_bsd_df
, "bsddf"},
1108 {Opt_minix_df
, "minixdf"},
1109 {Opt_grpid
, "grpid"},
1110 {Opt_grpid
, "bsdgroups"},
1111 {Opt_nogrpid
, "nogrpid"},
1112 {Opt_nogrpid
, "sysvgroups"},
1113 {Opt_resgid
, "resgid=%u"},
1114 {Opt_resuid
, "resuid=%u"},
1116 {Opt_err_cont
, "errors=continue"},
1117 {Opt_err_panic
, "errors=panic"},
1118 {Opt_err_ro
, "errors=remount-ro"},
1119 {Opt_nouid32
, "nouid32"},
1120 {Opt_debug
, "debug"},
1121 {Opt_oldalloc
, "oldalloc"},
1122 {Opt_orlov
, "orlov"},
1123 {Opt_user_xattr
, "user_xattr"},
1124 {Opt_nouser_xattr
, "nouser_xattr"},
1126 {Opt_noacl
, "noacl"},
1127 {Opt_noload
, "noload"},
1128 {Opt_noload
, "norecovery"},
1131 {Opt_commit
, "commit=%u"},
1132 {Opt_min_batch_time
, "min_batch_time=%u"},
1133 {Opt_max_batch_time
, "max_batch_time=%u"},
1134 {Opt_journal_update
, "journal=update"},
1135 {Opt_journal_dev
, "journal_dev=%u"},
1136 {Opt_journal_checksum
, "journal_checksum"},
1137 {Opt_journal_async_commit
, "journal_async_commit"},
1138 {Opt_abort
, "abort"},
1139 {Opt_data_journal
, "data=journal"},
1140 {Opt_data_ordered
, "data=ordered"},
1141 {Opt_data_writeback
, "data=writeback"},
1142 {Opt_data_err_abort
, "data_err=abort"},
1143 {Opt_data_err_ignore
, "data_err=ignore"},
1144 {Opt_offusrjquota
, "usrjquota="},
1145 {Opt_usrjquota
, "usrjquota=%s"},
1146 {Opt_offgrpjquota
, "grpjquota="},
1147 {Opt_grpjquota
, "grpjquota=%s"},
1148 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1149 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1150 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1151 {Opt_grpquota
, "grpquota"},
1152 {Opt_noquota
, "noquota"},
1153 {Opt_quota
, "quota"},
1154 {Opt_usrquota
, "usrquota"},
1155 {Opt_barrier
, "barrier=%u"},
1156 {Opt_barrier
, "barrier"},
1157 {Opt_nobarrier
, "nobarrier"},
1158 {Opt_i_version
, "i_version"},
1159 {Opt_stripe
, "stripe=%u"},
1160 {Opt_resize
, "resize"},
1161 {Opt_delalloc
, "delalloc"},
1162 {Opt_nodelalloc
, "nodelalloc"},
1163 {Opt_block_validity
, "block_validity"},
1164 {Opt_noblock_validity
, "noblock_validity"},
1165 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1166 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1167 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1168 {Opt_auto_da_alloc
, "auto_da_alloc"},
1169 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1170 {Opt_discard
, "discard"},
1171 {Opt_nodiscard
, "nodiscard"},
1175 static ext4_fsblk_t
get_sb_block(void **data
)
1177 ext4_fsblk_t sb_block
;
1178 char *options
= (char *) *data
;
1180 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1181 return 1; /* Default location */
1184 /* TODO: use simple_strtoll with >32bit ext4 */
1185 sb_block
= simple_strtoul(options
, &options
, 0);
1186 if (*options
&& *options
!= ',') {
1187 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1191 if (*options
== ',')
1193 *data
= (void *) options
;
1198 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1200 static int parse_options(char *options
, struct super_block
*sb
,
1201 unsigned long *journal_devnum
,
1202 unsigned int *journal_ioprio
,
1203 ext4_fsblk_t
*n_blocks_count
, int is_remount
)
1205 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1207 substring_t args
[MAX_OPT_ARGS
];
1218 while ((p
= strsep(&options
, ",")) != NULL
) {
1223 token
= match_token(p
, tokens
, args
);
1226 clear_opt(sbi
->s_mount_opt
, MINIX_DF
);
1229 set_opt(sbi
->s_mount_opt
, MINIX_DF
);
1232 set_opt(sbi
->s_mount_opt
, GRPID
);
1235 clear_opt(sbi
->s_mount_opt
, GRPID
);
1238 if (match_int(&args
[0], &option
))
1240 sbi
->s_resuid
= option
;
1243 if (match_int(&args
[0], &option
))
1245 sbi
->s_resgid
= option
;
1248 /* handled by get_sb_block() instead of here */
1249 /* *sb_block = match_int(&args[0]); */
1252 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1253 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1254 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1257 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1258 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1259 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1262 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1263 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1264 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1267 set_opt(sbi
->s_mount_opt
, NO_UID32
);
1270 set_opt(sbi
->s_mount_opt
, DEBUG
);
1273 set_opt(sbi
->s_mount_opt
, OLDALLOC
);
1276 clear_opt(sbi
->s_mount_opt
, OLDALLOC
);
1278 #ifdef CONFIG_EXT4_FS_XATTR
1279 case Opt_user_xattr
:
1280 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
1282 case Opt_nouser_xattr
:
1283 clear_opt(sbi
->s_mount_opt
, XATTR_USER
);
1286 case Opt_user_xattr
:
1287 case Opt_nouser_xattr
:
1288 ext4_msg(sb
, KERN_ERR
, "(no)user_xattr options not supported");
1291 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1293 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1296 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1301 ext4_msg(sb
, KERN_ERR
, "(no)acl options not supported");
1304 case Opt_journal_update
:
1306 /* Eventually we will want to be able to create
1307 a journal file here. For now, only allow the
1308 user to specify an existing inode to be the
1311 ext4_msg(sb
, KERN_ERR
,
1312 "Cannot specify journal on remount");
1315 set_opt(sbi
->s_mount_opt
, UPDATE_JOURNAL
);
1317 case Opt_journal_dev
:
1319 ext4_msg(sb
, KERN_ERR
,
1320 "Cannot specify journal on remount");
1323 if (match_int(&args
[0], &option
))
1325 *journal_devnum
= option
;
1327 case Opt_journal_checksum
:
1328 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1330 case Opt_journal_async_commit
:
1331 set_opt(sbi
->s_mount_opt
, JOURNAL_ASYNC_COMMIT
);
1332 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1335 set_opt(sbi
->s_mount_opt
, NOLOAD
);
1338 if (match_int(&args
[0], &option
))
1343 option
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1344 sbi
->s_commit_interval
= HZ
* option
;
1346 case Opt_max_batch_time
:
1347 if (match_int(&args
[0], &option
))
1352 option
= EXT4_DEF_MAX_BATCH_TIME
;
1353 sbi
->s_max_batch_time
= option
;
1355 case Opt_min_batch_time
:
1356 if (match_int(&args
[0], &option
))
1360 sbi
->s_min_batch_time
= option
;
1362 case Opt_data_journal
:
1363 data_opt
= EXT4_MOUNT_JOURNAL_DATA
;
1365 case Opt_data_ordered
:
1366 data_opt
= EXT4_MOUNT_ORDERED_DATA
;
1368 case Opt_data_writeback
:
1369 data_opt
= EXT4_MOUNT_WRITEBACK_DATA
;
1372 if ((sbi
->s_mount_opt
& EXT4_MOUNT_DATA_FLAGS
)
1374 ext4_msg(sb
, KERN_ERR
,
1375 "Cannot change data mode on remount");
1379 sbi
->s_mount_opt
&= ~EXT4_MOUNT_DATA_FLAGS
;
1380 sbi
->s_mount_opt
|= data_opt
;
1383 case Opt_data_err_abort
:
1384 set_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1386 case Opt_data_err_ignore
:
1387 clear_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1396 if (sb_any_quota_loaded(sb
) &&
1397 !sbi
->s_qf_names
[qtype
]) {
1398 ext4_msg(sb
, KERN_ERR
,
1399 "Cannot change journaled "
1400 "quota options when quota turned on");
1403 qname
= match_strdup(&args
[0]);
1405 ext4_msg(sb
, KERN_ERR
,
1406 "Not enough memory for "
1407 "storing quotafile name");
1410 if (sbi
->s_qf_names
[qtype
] &&
1411 strcmp(sbi
->s_qf_names
[qtype
], qname
)) {
1412 ext4_msg(sb
, KERN_ERR
,
1413 "%s quota file already "
1414 "specified", QTYPE2NAME(qtype
));
1418 sbi
->s_qf_names
[qtype
] = qname
;
1419 if (strchr(sbi
->s_qf_names
[qtype
], '/')) {
1420 ext4_msg(sb
, KERN_ERR
,
1421 "quotafile must be on "
1423 kfree(sbi
->s_qf_names
[qtype
]);
1424 sbi
->s_qf_names
[qtype
] = NULL
;
1427 set_opt(sbi
->s_mount_opt
, QUOTA
);
1429 case Opt_offusrjquota
:
1432 case Opt_offgrpjquota
:
1435 if (sb_any_quota_loaded(sb
) &&
1436 sbi
->s_qf_names
[qtype
]) {
1437 ext4_msg(sb
, KERN_ERR
, "Cannot change "
1438 "journaled quota options when "
1443 * The space will be released later when all options
1444 * are confirmed to be correct
1446 sbi
->s_qf_names
[qtype
] = NULL
;
1448 case Opt_jqfmt_vfsold
:
1449 qfmt
= QFMT_VFS_OLD
;
1451 case Opt_jqfmt_vfsv0
:
1454 case Opt_jqfmt_vfsv1
:
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 case Opt_jqfmt_vfsv1
:
1499 ext4_msg(sb
, KERN_ERR
,
1500 "journaled quota options not supported");
1506 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1509 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1512 if (match_int(&args
[0], &option
)) {
1513 set_opt(sbi
->s_mount_opt
, BARRIER
);
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
:
1588 if (match_int(&args
[0], &option
)) {
1589 clear_opt(sbi
->s_mount_opt
, NO_AUTO_DA_ALLOC
);
1593 clear_opt(sbi
->s_mount_opt
, NO_AUTO_DA_ALLOC
);
1595 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1598 set_opt(sbi
->s_mount_opt
, DISCARD
);
1601 clear_opt(sbi
->s_mount_opt
, DISCARD
);
1604 ext4_msg(sb
, KERN_ERR
,
1605 "Unrecognized mount option \"%s\" "
1606 "or missing value", p
);
1611 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1612 if ((sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
) &&
1613 sbi
->s_qf_names
[USRQUOTA
])
1614 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1616 if ((sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
) &&
1617 sbi
->s_qf_names
[GRPQUOTA
])
1618 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1620 if ((sbi
->s_qf_names
[USRQUOTA
] &&
1621 (sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
)) ||
1622 (sbi
->s_qf_names
[GRPQUOTA
] &&
1623 (sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
))) {
1624 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1629 if (!sbi
->s_jquota_fmt
) {
1630 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1635 if (sbi
->s_jquota_fmt
) {
1636 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1637 "specified with no journaling "
1646 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1649 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1652 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1653 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
1654 "forcing read-only mode");
1659 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1660 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
1661 "running e2fsck is recommended");
1662 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1663 ext4_msg(sb
, KERN_WARNING
,
1664 "warning: mounting fs with errors, "
1665 "running e2fsck is recommended");
1666 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
1667 le16_to_cpu(es
->s_mnt_count
) >=
1668 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1669 ext4_msg(sb
, KERN_WARNING
,
1670 "warning: maximal mount count reached, "
1671 "running e2fsck is recommended");
1672 else if (le32_to_cpu(es
->s_checkinterval
) &&
1673 (le32_to_cpu(es
->s_lastcheck
) +
1674 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1675 ext4_msg(sb
, KERN_WARNING
,
1676 "warning: checktime reached, "
1677 "running e2fsck is recommended");
1678 if (!sbi
->s_journal
)
1679 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1680 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1681 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1682 le16_add_cpu(&es
->s_mnt_count
, 1);
1683 es
->s_mtime
= cpu_to_le32(get_seconds());
1684 ext4_update_dynamic_rev(sb
);
1686 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1688 ext4_commit_super(sb
, 1);
1689 if (test_opt(sb
, DEBUG
))
1690 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
1691 "bpg=%lu, ipg=%lu, mo=%04x]\n",
1693 sbi
->s_groups_count
,
1694 EXT4_BLOCKS_PER_GROUP(sb
),
1695 EXT4_INODES_PER_GROUP(sb
),
1701 static int ext4_fill_flex_info(struct super_block
*sb
)
1703 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1704 struct ext4_group_desc
*gdp
= NULL
;
1705 ext4_group_t flex_group_count
;
1706 ext4_group_t flex_group
;
1707 int groups_per_flex
= 0;
1711 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1712 groups_per_flex
= 1 << sbi
->s_log_groups_per_flex
;
1714 if (groups_per_flex
< 2) {
1715 sbi
->s_log_groups_per_flex
= 0;
1719 /* We allocate both existing and potentially added groups */
1720 flex_group_count
= ((sbi
->s_groups_count
+ groups_per_flex
- 1) +
1721 ((le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
) + 1) <<
1722 EXT4_DESC_PER_BLOCK_BITS(sb
))) / groups_per_flex
;
1723 size
= flex_group_count
* sizeof(struct flex_groups
);
1724 sbi
->s_flex_groups
= kzalloc(size
, GFP_KERNEL
);
1725 if (sbi
->s_flex_groups
== NULL
) {
1726 sbi
->s_flex_groups
= vmalloc(size
);
1727 if (sbi
->s_flex_groups
)
1728 memset(sbi
->s_flex_groups
, 0, size
);
1730 if (sbi
->s_flex_groups
== NULL
) {
1731 ext4_msg(sb
, KERN_ERR
, "not enough memory for "
1732 "%u flex groups", flex_group_count
);
1736 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1737 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1739 flex_group
= ext4_flex_group(sbi
, i
);
1740 atomic_add(ext4_free_inodes_count(sb
, gdp
),
1741 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
1742 atomic_add(ext4_free_blks_count(sb
, gdp
),
1743 &sbi
->s_flex_groups
[flex_group
].free_blocks
);
1744 atomic_add(ext4_used_dirs_count(sb
, gdp
),
1745 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
1753 __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
1754 struct ext4_group_desc
*gdp
)
1758 if (sbi
->s_es
->s_feature_ro_compat
&
1759 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) {
1760 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
1761 __le32 le_group
= cpu_to_le32(block_group
);
1763 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
1764 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
1765 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
1766 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
1767 /* for checksum of struct ext4_group_desc do the rest...*/
1768 if ((sbi
->s_es
->s_feature_incompat
&
1769 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
1770 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
1771 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
1772 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
1776 return cpu_to_le16(crc
);
1779 int ext4_group_desc_csum_verify(struct ext4_sb_info
*sbi
, __u32 block_group
,
1780 struct ext4_group_desc
*gdp
)
1782 if ((sbi
->s_es
->s_feature_ro_compat
&
1783 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) &&
1784 (gdp
->bg_checksum
!= ext4_group_desc_csum(sbi
, block_group
, gdp
)))
1790 /* Called at mount-time, super-block is locked */
1791 static int ext4_check_descriptors(struct super_block
*sb
)
1793 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1794 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
1795 ext4_fsblk_t last_block
;
1796 ext4_fsblk_t block_bitmap
;
1797 ext4_fsblk_t inode_bitmap
;
1798 ext4_fsblk_t inode_table
;
1799 int flexbg_flag
= 0;
1802 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
1805 ext4_debug("Checking group descriptors");
1807 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1808 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1810 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
1811 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
1813 last_block
= first_block
+
1814 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
1816 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
1817 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
1818 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1819 "Block bitmap for group %u not in group "
1820 "(block %llu)!", i
, block_bitmap
);
1823 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
1824 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
1825 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1826 "Inode bitmap for group %u not in group "
1827 "(block %llu)!", i
, inode_bitmap
);
1830 inode_table
= ext4_inode_table(sb
, gdp
);
1831 if (inode_table
< first_block
||
1832 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
1833 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1834 "Inode table for group %u not in group "
1835 "(block %llu)!", i
, inode_table
);
1838 ext4_lock_group(sb
, i
);
1839 if (!ext4_group_desc_csum_verify(sbi
, i
, gdp
)) {
1840 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1841 "Checksum for group %u failed (%u!=%u)",
1842 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
1843 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
1844 if (!(sb
->s_flags
& MS_RDONLY
)) {
1845 ext4_unlock_group(sb
, i
);
1849 ext4_unlock_group(sb
, i
);
1851 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
1854 ext4_free_blocks_count_set(sbi
->s_es
, ext4_count_free_blocks(sb
));
1855 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
1859 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1860 * the superblock) which were deleted from all directories, but held open by
1861 * a process at the time of a crash. We walk the list and try to delete these
1862 * inodes at recovery time (only with a read-write filesystem).
1864 * In order to keep the orphan inode chain consistent during traversal (in
1865 * case of crash during recovery), we link each inode into the superblock
1866 * orphan list_head and handle it the same way as an inode deletion during
1867 * normal operation (which journals the operations for us).
1869 * We only do an iget() and an iput() on each inode, which is very safe if we
1870 * accidentally point at an in-use or already deleted inode. The worst that
1871 * can happen in this case is that we get a "bit already cleared" message from
1872 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1873 * e2fsck was run on this filesystem, and it must have already done the orphan
1874 * inode cleanup for us, so we can safely abort without any further action.
1876 static void ext4_orphan_cleanup(struct super_block
*sb
,
1877 struct ext4_super_block
*es
)
1879 unsigned int s_flags
= sb
->s_flags
;
1880 int nr_orphans
= 0, nr_truncates
= 0;
1884 if (!es
->s_last_orphan
) {
1885 jbd_debug(4, "no orphan inodes to clean up\n");
1889 if (bdev_read_only(sb
->s_bdev
)) {
1890 ext4_msg(sb
, KERN_ERR
, "write access "
1891 "unavailable, skipping orphan cleanup");
1895 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
1896 if (es
->s_last_orphan
)
1897 jbd_debug(1, "Errors on filesystem, "
1898 "clearing orphan list.\n");
1899 es
->s_last_orphan
= 0;
1900 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1904 if (s_flags
& MS_RDONLY
) {
1905 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
1906 sb
->s_flags
&= ~MS_RDONLY
;
1909 /* Needed for iput() to work correctly and not trash data */
1910 sb
->s_flags
|= MS_ACTIVE
;
1911 /* Turn on quotas so that they are updated correctly */
1912 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1913 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
1914 int ret
= ext4_quota_on_mount(sb
, i
);
1916 ext4_msg(sb
, KERN_ERR
,
1917 "Cannot turn on journaled "
1918 "quota: error %d", ret
);
1923 while (es
->s_last_orphan
) {
1924 struct inode
*inode
;
1926 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
1927 if (IS_ERR(inode
)) {
1928 es
->s_last_orphan
= 0;
1932 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
1933 dquot_initialize(inode
);
1934 if (inode
->i_nlink
) {
1935 ext4_msg(sb
, KERN_DEBUG
,
1936 "%s: truncating inode %lu to %lld bytes",
1937 __func__
, inode
->i_ino
, inode
->i_size
);
1938 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
1939 inode
->i_ino
, inode
->i_size
);
1940 ext4_truncate(inode
);
1943 ext4_msg(sb
, KERN_DEBUG
,
1944 "%s: deleting unreferenced inode %lu",
1945 __func__
, inode
->i_ino
);
1946 jbd_debug(2, "deleting unreferenced inode %lu\n",
1950 iput(inode
); /* The delete magic happens here! */
1953 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
1956 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
1957 PLURAL(nr_orphans
));
1959 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
1960 PLURAL(nr_truncates
));
1962 /* Turn quotas off */
1963 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1964 if (sb_dqopt(sb
)->files
[i
])
1965 vfs_quota_off(sb
, i
, 0);
1968 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
1972 * Maximal extent format file size.
1973 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1974 * extent format containers, within a sector_t, and within i_blocks
1975 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1976 * so that won't be a limiting factor.
1978 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1980 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
1983 loff_t upper_limit
= MAX_LFS_FILESIZE
;
1985 /* small i_blocks in vfs inode? */
1986 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
1988 * CONFIG_LBDAF is not enabled implies the inode
1989 * i_block represent total blocks in 512 bytes
1990 * 32 == size of vfs inode i_blocks * 8
1992 upper_limit
= (1LL << 32) - 1;
1994 /* total blocks in file system block size */
1995 upper_limit
>>= (blkbits
- 9);
1996 upper_limit
<<= blkbits
;
1999 /* 32-bit extent-start container, ee_block */
2004 /* Sanity check against vm- & vfs- imposed limits */
2005 if (res
> upper_limit
)
2012 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2013 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2014 * We need to be 1 filesystem block less than the 2^48 sector limit.
2016 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2018 loff_t res
= EXT4_NDIR_BLOCKS
;
2021 /* This is calculated to be the largest file size for a dense, block
2022 * mapped file such that the file's total number of 512-byte sectors,
2023 * including data and all indirect blocks, does not exceed (2^48 - 1).
2025 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2026 * number of 512-byte sectors of the file.
2029 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2031 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2032 * the inode i_block field represents total file blocks in
2033 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2035 upper_limit
= (1LL << 32) - 1;
2037 /* total blocks in file system block size */
2038 upper_limit
>>= (bits
- 9);
2042 * We use 48 bit ext4_inode i_blocks
2043 * With EXT4_HUGE_FILE_FL set the i_blocks
2044 * represent total number of blocks in
2045 * file system block size
2047 upper_limit
= (1LL << 48) - 1;
2051 /* indirect blocks */
2053 /* double indirect blocks */
2054 meta_blocks
+= 1 + (1LL << (bits
-2));
2055 /* tripple indirect blocks */
2056 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2058 upper_limit
-= meta_blocks
;
2059 upper_limit
<<= bits
;
2061 res
+= 1LL << (bits
-2);
2062 res
+= 1LL << (2*(bits
-2));
2063 res
+= 1LL << (3*(bits
-2));
2065 if (res
> upper_limit
)
2068 if (res
> MAX_LFS_FILESIZE
)
2069 res
= MAX_LFS_FILESIZE
;
2074 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2075 ext4_fsblk_t logical_sb_block
, int nr
)
2077 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2078 ext4_group_t bg
, first_meta_bg
;
2081 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2083 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
2085 return logical_sb_block
+ nr
+ 1;
2086 bg
= sbi
->s_desc_per_block
* nr
;
2087 if (ext4_bg_has_super(sb
, bg
))
2090 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2094 * ext4_get_stripe_size: Get the stripe size.
2095 * @sbi: In memory super block info
2097 * If we have specified it via mount option, then
2098 * use the mount option value. If the value specified at mount time is
2099 * greater than the blocks per group use the super block value.
2100 * If the super block value is greater than blocks per group return 0.
2101 * Allocator needs it be less than blocks per group.
2104 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2106 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2107 unsigned long stripe_width
=
2108 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2110 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2111 return sbi
->s_stripe
;
2113 if (stripe_width
<= sbi
->s_blocks_per_group
)
2114 return stripe_width
;
2116 if (stride
<= sbi
->s_blocks_per_group
)
2125 struct attribute attr
;
2126 ssize_t (*show
)(struct ext4_attr
*, struct ext4_sb_info
*, char *);
2127 ssize_t (*store
)(struct ext4_attr
*, struct ext4_sb_info
*,
2128 const char *, size_t);
2132 static int parse_strtoul(const char *buf
,
2133 unsigned long max
, unsigned long *value
)
2137 *value
= simple_strtoul(skip_spaces(buf
), &endp
, 0);
2138 endp
= skip_spaces(endp
);
2139 if (*endp
|| *value
> max
)
2145 static ssize_t
delayed_allocation_blocks_show(struct ext4_attr
*a
,
2146 struct ext4_sb_info
*sbi
,
2149 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2150 (s64
) percpu_counter_sum(&sbi
->s_dirtyblocks_counter
));
2153 static ssize_t
session_write_kbytes_show(struct ext4_attr
*a
,
2154 struct ext4_sb_info
*sbi
, char *buf
)
2156 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2158 return snprintf(buf
, PAGE_SIZE
, "%lu\n",
2159 (part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2160 sbi
->s_sectors_written_start
) >> 1);
2163 static ssize_t
lifetime_write_kbytes_show(struct ext4_attr
*a
,
2164 struct ext4_sb_info
*sbi
, char *buf
)
2166 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2168 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2169 (unsigned long long)(sbi
->s_kbytes_written
+
2170 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2171 EXT4_SB(sb
)->s_sectors_written_start
) >> 1)));
2174 static ssize_t
inode_readahead_blks_store(struct ext4_attr
*a
,
2175 struct ext4_sb_info
*sbi
,
2176 const char *buf
, size_t count
)
2180 if (parse_strtoul(buf
, 0x40000000, &t
))
2183 if (!is_power_of_2(t
))
2186 sbi
->s_inode_readahead_blks
= t
;
2190 static ssize_t
sbi_ui_show(struct ext4_attr
*a
,
2191 struct ext4_sb_info
*sbi
, char *buf
)
2193 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2195 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
2198 static ssize_t
sbi_ui_store(struct ext4_attr
*a
,
2199 struct ext4_sb_info
*sbi
,
2200 const char *buf
, size_t count
)
2202 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2205 if (parse_strtoul(buf
, 0xffffffff, &t
))
2211 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2212 static struct ext4_attr ext4_attr_##_name = { \
2213 .attr = {.name = __stringify(_name), .mode = _mode }, \
2216 .offset = offsetof(struct ext4_sb_info, _elname), \
2218 #define EXT4_ATTR(name, mode, show, store) \
2219 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2221 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2222 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2223 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2224 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2225 #define ATTR_LIST(name) &ext4_attr_##name.attr
2227 EXT4_RO_ATTR(delayed_allocation_blocks
);
2228 EXT4_RO_ATTR(session_write_kbytes
);
2229 EXT4_RO_ATTR(lifetime_write_kbytes
);
2230 EXT4_ATTR_OFFSET(inode_readahead_blks
, 0644, sbi_ui_show
,
2231 inode_readahead_blks_store
, s_inode_readahead_blks
);
2232 EXT4_RW_ATTR_SBI_UI(inode_goal
, s_inode_goal
);
2233 EXT4_RW_ATTR_SBI_UI(mb_stats
, s_mb_stats
);
2234 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan
, s_mb_max_to_scan
);
2235 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan
, s_mb_min_to_scan
);
2236 EXT4_RW_ATTR_SBI_UI(mb_order2_req
, s_mb_order2_reqs
);
2237 EXT4_RW_ATTR_SBI_UI(mb_stream_req
, s_mb_stream_request
);
2238 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc
, s_mb_group_prealloc
);
2239 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump
, s_max_writeback_mb_bump
);
2241 static struct attribute
*ext4_attrs
[] = {
2242 ATTR_LIST(delayed_allocation_blocks
),
2243 ATTR_LIST(session_write_kbytes
),
2244 ATTR_LIST(lifetime_write_kbytes
),
2245 ATTR_LIST(inode_readahead_blks
),
2246 ATTR_LIST(inode_goal
),
2247 ATTR_LIST(mb_stats
),
2248 ATTR_LIST(mb_max_to_scan
),
2249 ATTR_LIST(mb_min_to_scan
),
2250 ATTR_LIST(mb_order2_req
),
2251 ATTR_LIST(mb_stream_req
),
2252 ATTR_LIST(mb_group_prealloc
),
2253 ATTR_LIST(max_writeback_mb_bump
),
2257 static ssize_t
ext4_attr_show(struct kobject
*kobj
,
2258 struct attribute
*attr
, char *buf
)
2260 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2262 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2264 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
2267 static ssize_t
ext4_attr_store(struct kobject
*kobj
,
2268 struct attribute
*attr
,
2269 const char *buf
, size_t len
)
2271 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2273 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2275 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
2278 static void ext4_sb_release(struct kobject
*kobj
)
2280 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2282 complete(&sbi
->s_kobj_unregister
);
2286 static struct sysfs_ops ext4_attr_ops
= {
2287 .show
= ext4_attr_show
,
2288 .store
= ext4_attr_store
,
2291 static struct kobj_type ext4_ktype
= {
2292 .default_attrs
= ext4_attrs
,
2293 .sysfs_ops
= &ext4_attr_ops
,
2294 .release
= ext4_sb_release
,
2298 * Check whether this filesystem can be mounted based on
2299 * the features present and the RDONLY/RDWR mount requested.
2300 * Returns 1 if this filesystem can be mounted as requested,
2301 * 0 if it cannot be.
2303 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2305 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
)) {
2306 ext4_msg(sb
, KERN_ERR
,
2307 "Couldn't mount because of "
2308 "unsupported optional features (%x)",
2309 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2310 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2317 /* Check that feature set is OK for a read-write mount */
2318 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
)) {
2319 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2320 "unsupported optional features (%x)",
2321 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2322 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2326 * Large file size enabled file system can only be mounted
2327 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2329 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
2330 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2331 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2332 "cannot be mounted RDWR without "
2340 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
2341 __releases(kernel_lock
)
2342 __acquires(kernel_lock
)
2344 struct buffer_head
*bh
;
2345 struct ext4_super_block
*es
= NULL
;
2346 struct ext4_sb_info
*sbi
;
2348 ext4_fsblk_t sb_block
= get_sb_block(&data
);
2349 ext4_fsblk_t logical_sb_block
;
2350 unsigned long offset
= 0;
2351 unsigned long journal_devnum
= 0;
2352 unsigned long def_mount_opts
;
2358 unsigned int db_count
;
2360 int needs_recovery
, has_huge_files
;
2363 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
2365 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
2369 sbi
->s_blockgroup_lock
=
2370 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
2371 if (!sbi
->s_blockgroup_lock
) {
2375 sb
->s_fs_info
= sbi
;
2376 sbi
->s_mount_opt
= 0;
2377 sbi
->s_resuid
= EXT4_DEF_RESUID
;
2378 sbi
->s_resgid
= EXT4_DEF_RESGID
;
2379 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
2380 sbi
->s_sb_block
= sb_block
;
2381 sbi
->s_sectors_written_start
= part_stat_read(sb
->s_bdev
->bd_part
,
2386 /* Cleanup superblock name */
2387 for (cp
= sb
->s_id
; (cp
= strchr(cp
, '/'));)
2390 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
2392 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
2397 * The ext4 superblock will not be buffer aligned for other than 1kB
2398 * block sizes. We need to calculate the offset from buffer start.
2400 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
2401 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2402 offset
= do_div(logical_sb_block
, blocksize
);
2404 logical_sb_block
= sb_block
;
2407 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
2408 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
2412 * Note: s_es must be initialized as soon as possible because
2413 * some ext4 macro-instructions depend on its value
2415 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
2417 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
2418 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
2420 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
2422 /* Set defaults before we parse the mount options */
2423 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
2424 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
2425 set_opt(sbi
->s_mount_opt
, DEBUG
);
2426 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
2427 set_opt(sbi
->s_mount_opt
, GRPID
);
2428 if (def_mount_opts
& EXT4_DEFM_UID16
)
2429 set_opt(sbi
->s_mount_opt
, NO_UID32
);
2430 #ifdef CONFIG_EXT4_FS_XATTR
2431 if (def_mount_opts
& EXT4_DEFM_XATTR_USER
)
2432 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
2434 #ifdef CONFIG_EXT4_FS_POSIX_ACL
2435 if (def_mount_opts
& EXT4_DEFM_ACL
)
2436 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
2438 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
2439 sbi
->s_mount_opt
|= EXT4_MOUNT_JOURNAL_DATA
;
2440 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
2441 sbi
->s_mount_opt
|= EXT4_MOUNT_ORDERED_DATA
;
2442 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
2443 sbi
->s_mount_opt
|= EXT4_MOUNT_WRITEBACK_DATA
;
2445 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
2446 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
2447 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
2448 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
2450 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
2452 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
2453 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
2454 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
2455 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
2456 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
2458 set_opt(sbi
->s_mount_opt
, BARRIER
);
2461 * enable delayed allocation by default
2462 * Use -o nodelalloc to turn it off
2464 set_opt(sbi
->s_mount_opt
, DELALLOC
);
2466 if (!parse_options((char *) data
, sb
, &journal_devnum
,
2467 &journal_ioprio
, NULL
, 0))
2470 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
2471 ((sbi
->s_mount_opt
& EXT4_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
2473 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
2474 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
2475 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
2476 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
2477 ext4_msg(sb
, KERN_WARNING
,
2478 "feature flags set on rev 0 fs, "
2479 "running e2fsck is recommended");
2482 * Check feature flags regardless of the revision level, since we
2483 * previously didn't change the revision level when setting the flags,
2484 * so there is a chance incompat flags are set on a rev 0 filesystem.
2486 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
2489 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
2491 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
2492 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
2493 ext4_msg(sb
, KERN_ERR
,
2494 "Unsupported filesystem blocksize %d", blocksize
);
2498 if (sb
->s_blocksize
!= blocksize
) {
2499 /* Validate the filesystem blocksize */
2500 if (!sb_set_blocksize(sb
, blocksize
)) {
2501 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
2507 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2508 offset
= do_div(logical_sb_block
, blocksize
);
2509 bh
= sb_bread(sb
, logical_sb_block
);
2511 ext4_msg(sb
, KERN_ERR
,
2512 "Can't read superblock on 2nd try");
2515 es
= (struct ext4_super_block
*)(((char *)bh
->b_data
) + offset
);
2517 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
2518 ext4_msg(sb
, KERN_ERR
,
2519 "Magic mismatch, very weird!");
2524 has_huge_files
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2525 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
);
2526 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
2528 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
2530 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
2531 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
2532 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
2534 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
2535 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
2536 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
2537 (!is_power_of_2(sbi
->s_inode_size
)) ||
2538 (sbi
->s_inode_size
> blocksize
)) {
2539 ext4_msg(sb
, KERN_ERR
,
2540 "unsupported inode size: %d",
2544 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
2545 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
2548 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
2549 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
2550 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
2551 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
2552 !is_power_of_2(sbi
->s_desc_size
)) {
2553 ext4_msg(sb
, KERN_ERR
,
2554 "unsupported descriptor size %lu",
2559 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
2561 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
2562 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
2563 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
2566 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
2567 if (sbi
->s_inodes_per_block
== 0)
2569 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
2570 sbi
->s_inodes_per_block
;
2571 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
2573 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
2574 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
2575 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
2577 for (i
= 0; i
< 4; i
++)
2578 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
2579 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
2580 i
= le32_to_cpu(es
->s_flags
);
2581 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
2582 sbi
->s_hash_unsigned
= 3;
2583 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
2584 #ifdef __CHAR_UNSIGNED__
2585 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
2586 sbi
->s_hash_unsigned
= 3;
2588 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
2593 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
2594 ext4_msg(sb
, KERN_ERR
,
2595 "#blocks per group too big: %lu",
2596 sbi
->s_blocks_per_group
);
2599 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
2600 ext4_msg(sb
, KERN_ERR
,
2601 "#inodes per group too big: %lu",
2602 sbi
->s_inodes_per_group
);
2607 * Test whether we have more sectors than will fit in sector_t,
2608 * and whether the max offset is addressable by the page cache.
2610 if ((ext4_blocks_count(es
) >
2611 (sector_t
)(~0ULL) >> (sb
->s_blocksize_bits
- 9)) ||
2612 (ext4_blocks_count(es
) >
2613 (pgoff_t
)(~0ULL) >> (PAGE_CACHE_SHIFT
- sb
->s_blocksize_bits
))) {
2614 ext4_msg(sb
, KERN_ERR
, "filesystem"
2615 " too large to mount safely on this system");
2616 if (sizeof(sector_t
) < 8)
2617 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
2622 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
2625 /* check blocks count against device size */
2626 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
2627 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
2628 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
2629 "exceeds size of device (%llu blocks)",
2630 ext4_blocks_count(es
), blocks_count
);
2635 * It makes no sense for the first data block to be beyond the end
2636 * of the filesystem.
2638 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
2639 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data"
2640 "block %u is beyond end of filesystem (%llu)",
2641 le32_to_cpu(es
->s_first_data_block
),
2642 ext4_blocks_count(es
));
2645 blocks_count
= (ext4_blocks_count(es
) -
2646 le32_to_cpu(es
->s_first_data_block
) +
2647 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2648 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
2649 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
2650 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
2651 "(block count %llu, first data block %u, "
2652 "blocks per group %lu)", sbi
->s_groups_count
,
2653 ext4_blocks_count(es
),
2654 le32_to_cpu(es
->s_first_data_block
),
2655 EXT4_BLOCKS_PER_GROUP(sb
));
2658 sbi
->s_groups_count
= blocks_count
;
2659 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
2660 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
2661 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
2662 EXT4_DESC_PER_BLOCK(sb
);
2663 sbi
->s_group_desc
= kmalloc(db_count
* sizeof(struct buffer_head
*),
2665 if (sbi
->s_group_desc
== NULL
) {
2666 ext4_msg(sb
, KERN_ERR
, "not enough memory");
2670 #ifdef CONFIG_PROC_FS
2672 sbi
->s_proc
= proc_mkdir(sb
->s_id
, ext4_proc_root
);
2675 bgl_lock_init(sbi
->s_blockgroup_lock
);
2677 for (i
= 0; i
< db_count
; i
++) {
2678 block
= descriptor_loc(sb
, logical_sb_block
, i
);
2679 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
2680 if (!sbi
->s_group_desc
[i
]) {
2681 ext4_msg(sb
, KERN_ERR
,
2682 "can't read group descriptor %d", i
);
2687 if (!ext4_check_descriptors(sb
)) {
2688 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
2691 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
2692 if (!ext4_fill_flex_info(sb
)) {
2693 ext4_msg(sb
, KERN_ERR
,
2694 "unable to initialize "
2695 "flex_bg meta info!");
2699 sbi
->s_gdb_count
= db_count
;
2700 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
2701 spin_lock_init(&sbi
->s_next_gen_lock
);
2703 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
2704 ext4_count_free_blocks(sb
));
2706 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
2707 ext4_count_free_inodes(sb
));
2710 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
2711 ext4_count_dirs(sb
));
2714 err
= percpu_counter_init(&sbi
->s_dirtyblocks_counter
, 0);
2717 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
2721 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
2722 sbi
->s_max_writeback_mb_bump
= 128;
2725 * set up enough so that it can read an inode
2727 if (!test_opt(sb
, NOLOAD
) &&
2728 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
2729 sb
->s_op
= &ext4_sops
;
2731 sb
->s_op
= &ext4_nojournal_sops
;
2732 sb
->s_export_op
= &ext4_export_ops
;
2733 sb
->s_xattr
= ext4_xattr_handlers
;
2735 sb
->s_qcop
= &ext4_qctl_operations
;
2736 sb
->dq_op
= &ext4_quota_operations
;
2738 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
2739 mutex_init(&sbi
->s_orphan_lock
);
2740 mutex_init(&sbi
->s_resize_lock
);
2744 needs_recovery
= (es
->s_last_orphan
!= 0 ||
2745 EXT4_HAS_INCOMPAT_FEATURE(sb
,
2746 EXT4_FEATURE_INCOMPAT_RECOVER
));
2749 * The first inode we look at is the journal inode. Don't try
2750 * root first: it may be modified in the journal!
2752 if (!test_opt(sb
, NOLOAD
) &&
2753 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
2754 if (ext4_load_journal(sb
, es
, journal_devnum
))
2756 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
2757 EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
2758 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
2759 "suppressed and not mounted read-only");
2762 clear_opt(sbi
->s_mount_opt
, DATA_FLAGS
);
2763 set_opt(sbi
->s_mount_opt
, WRITEBACK_DATA
);
2764 sbi
->s_journal
= NULL
;
2769 if (ext4_blocks_count(es
) > 0xffffffffULL
&&
2770 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
2771 JBD2_FEATURE_INCOMPAT_64BIT
)) {
2772 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
2776 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
2777 jbd2_journal_set_features(sbi
->s_journal
,
2778 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2779 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2780 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
2781 jbd2_journal_set_features(sbi
->s_journal
,
2782 JBD2_FEATURE_COMPAT_CHECKSUM
, 0, 0);
2783 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
2784 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2786 jbd2_journal_clear_features(sbi
->s_journal
,
2787 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2788 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2791 /* We have now updated the journal if required, so we can
2792 * validate the data journaling mode. */
2793 switch (test_opt(sb
, DATA_FLAGS
)) {
2795 /* No mode set, assume a default based on the journal
2796 * capabilities: ORDERED_DATA if the journal can
2797 * cope, else JOURNAL_DATA
2799 if (jbd2_journal_check_available_features
2800 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
2801 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
2803 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
2806 case EXT4_MOUNT_ORDERED_DATA
:
2807 case EXT4_MOUNT_WRITEBACK_DATA
:
2808 if (!jbd2_journal_check_available_features
2809 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
2810 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
2811 "requested data journaling mode");
2817 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
2821 if (test_opt(sb
, NOBH
)) {
2822 if (!(test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)) {
2823 ext4_msg(sb
, KERN_WARNING
, "Ignoring nobh option - "
2824 "its supported only with writeback mode");
2825 clear_opt(sbi
->s_mount_opt
, NOBH
);
2828 EXT4_SB(sb
)->dio_unwritten_wq
= create_workqueue("ext4-dio-unwritten");
2829 if (!EXT4_SB(sb
)->dio_unwritten_wq
) {
2830 printk(KERN_ERR
"EXT4-fs: failed to create DIO workqueue\n");
2831 goto failed_mount_wq
;
2835 * The jbd2_journal_load will have done any necessary log recovery,
2836 * so we can safely mount the rest of the filesystem now.
2839 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
2841 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
2842 ret
= PTR_ERR(root
);
2845 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
2847 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
2850 sb
->s_root
= d_alloc_root(root
);
2852 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
2858 ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
);
2860 /* determine the minimum size of new large inodes, if present */
2861 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
2862 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2863 EXT4_GOOD_OLD_INODE_SIZE
;
2864 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2865 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
2866 if (sbi
->s_want_extra_isize
<
2867 le16_to_cpu(es
->s_want_extra_isize
))
2868 sbi
->s_want_extra_isize
=
2869 le16_to_cpu(es
->s_want_extra_isize
);
2870 if (sbi
->s_want_extra_isize
<
2871 le16_to_cpu(es
->s_min_extra_isize
))
2872 sbi
->s_want_extra_isize
=
2873 le16_to_cpu(es
->s_min_extra_isize
);
2876 /* Check if enough inode space is available */
2877 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
2878 sbi
->s_inode_size
) {
2879 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2880 EXT4_GOOD_OLD_INODE_SIZE
;
2881 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
2885 if (test_opt(sb
, DELALLOC
) &&
2886 (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)) {
2887 ext4_msg(sb
, KERN_WARNING
, "Ignoring delalloc option - "
2888 "requested data journaling mode");
2889 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
2892 err
= ext4_setup_system_zone(sb
);
2894 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
2895 "zone (%d)\n", err
);
2900 err
= ext4_mb_init(sb
, needs_recovery
);
2902 ext4_msg(sb
, KERN_ERR
, "failed to initalize mballoc (%d)",
2907 sbi
->s_kobj
.kset
= ext4_kset
;
2908 init_completion(&sbi
->s_kobj_unregister
);
2909 err
= kobject_init_and_add(&sbi
->s_kobj
, &ext4_ktype
, NULL
,
2912 ext4_mb_release(sb
);
2913 ext4_ext_release(sb
);
2917 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
2918 ext4_orphan_cleanup(sb
, es
);
2919 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
2920 if (needs_recovery
) {
2921 ext4_msg(sb
, KERN_INFO
, "recovery complete");
2922 ext4_mark_recovery_complete(sb
, es
);
2924 if (EXT4_SB(sb
)->s_journal
) {
2925 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
2926 descr
= " journalled data mode";
2927 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
2928 descr
= " ordered data mode";
2930 descr
= " writeback data mode";
2932 descr
= "out journal";
2934 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s", descr
);
2941 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
2945 ext4_msg(sb
, KERN_ERR
, "mount failed");
2946 destroy_workqueue(EXT4_SB(sb
)->dio_unwritten_wq
);
2948 ext4_release_system_zone(sb
);
2949 if (sbi
->s_journal
) {
2950 jbd2_journal_destroy(sbi
->s_journal
);
2951 sbi
->s_journal
= NULL
;
2954 if (sbi
->s_flex_groups
) {
2955 if (is_vmalloc_addr(sbi
->s_flex_groups
))
2956 vfree(sbi
->s_flex_groups
);
2958 kfree(sbi
->s_flex_groups
);
2960 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
2961 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
2962 percpu_counter_destroy(&sbi
->s_dirs_counter
);
2963 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
2965 for (i
= 0; i
< db_count
; i
++)
2966 brelse(sbi
->s_group_desc
[i
]);
2967 kfree(sbi
->s_group_desc
);
2970 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
2973 for (i
= 0; i
< MAXQUOTAS
; i
++)
2974 kfree(sbi
->s_qf_names
[i
]);
2976 ext4_blkdev_remove(sbi
);
2979 sb
->s_fs_info
= NULL
;
2980 kfree(sbi
->s_blockgroup_lock
);
2987 * Setup any per-fs journal parameters now. We'll do this both on
2988 * initial mount, once the journal has been initialised but before we've
2989 * done any recovery; and again on any subsequent remount.
2991 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
2993 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2995 journal
->j_commit_interval
= sbi
->s_commit_interval
;
2996 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
2997 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
2999 spin_lock(&journal
->j_state_lock
);
3000 if (test_opt(sb
, BARRIER
))
3001 journal
->j_flags
|= JBD2_BARRIER
;
3003 journal
->j_flags
&= ~JBD2_BARRIER
;
3004 if (test_opt(sb
, DATA_ERR_ABORT
))
3005 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
3007 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
3008 spin_unlock(&journal
->j_state_lock
);
3011 static journal_t
*ext4_get_journal(struct super_block
*sb
,
3012 unsigned int journal_inum
)
3014 struct inode
*journal_inode
;
3017 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3019 /* First, test for the existence of a valid inode on disk. Bad
3020 * things happen if we iget() an unused inode, as the subsequent
3021 * iput() will try to delete it. */
3023 journal_inode
= ext4_iget(sb
, journal_inum
);
3024 if (IS_ERR(journal_inode
)) {
3025 ext4_msg(sb
, KERN_ERR
, "no journal found");
3028 if (!journal_inode
->i_nlink
) {
3029 make_bad_inode(journal_inode
);
3030 iput(journal_inode
);
3031 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
3035 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3036 journal_inode
, journal_inode
->i_size
);
3037 if (!S_ISREG(journal_inode
->i_mode
)) {
3038 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
3039 iput(journal_inode
);
3043 journal
= jbd2_journal_init_inode(journal_inode
);
3045 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
3046 iput(journal_inode
);
3049 journal
->j_private
= sb
;
3050 ext4_init_journal_params(sb
, journal
);
3054 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
3057 struct buffer_head
*bh
;
3061 int hblock
, blocksize
;
3062 ext4_fsblk_t sb_block
;
3063 unsigned long offset
;
3064 struct ext4_super_block
*es
;
3065 struct block_device
*bdev
;
3067 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3069 bdev
= ext4_blkdev_get(j_dev
, sb
);
3073 if (bd_claim(bdev
, sb
)) {
3074 ext4_msg(sb
, KERN_ERR
,
3075 "failed to claim external journal device");
3076 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
3080 blocksize
= sb
->s_blocksize
;
3081 hblock
= bdev_logical_block_size(bdev
);
3082 if (blocksize
< hblock
) {
3083 ext4_msg(sb
, KERN_ERR
,
3084 "blocksize too small for journal device");
3088 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
3089 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
3090 set_blocksize(bdev
, blocksize
);
3091 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
3092 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
3093 "external journal");
3097 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
3098 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
3099 !(le32_to_cpu(es
->s_feature_incompat
) &
3100 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
3101 ext4_msg(sb
, KERN_ERR
, "external journal has "
3107 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
3108 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
3113 len
= ext4_blocks_count(es
);
3114 start
= sb_block
+ 1;
3115 brelse(bh
); /* we're done with the superblock */
3117 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
3118 start
, len
, blocksize
);
3120 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
3123 journal
->j_private
= sb
;
3124 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
3125 wait_on_buffer(journal
->j_sb_buffer
);
3126 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
3127 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
3130 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
3131 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
3132 "user (unsupported) - %d",
3133 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
3136 EXT4_SB(sb
)->journal_bdev
= bdev
;
3137 ext4_init_journal_params(sb
, journal
);
3141 jbd2_journal_destroy(journal
);
3143 ext4_blkdev_put(bdev
);
3147 static int ext4_load_journal(struct super_block
*sb
,
3148 struct ext4_super_block
*es
,
3149 unsigned long journal_devnum
)
3152 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
3155 int really_read_only
;
3157 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3159 if (journal_devnum
&&
3160 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3161 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
3162 "numbers have changed");
3163 journal_dev
= new_decode_dev(journal_devnum
);
3165 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
3167 really_read_only
= bdev_read_only(sb
->s_bdev
);
3170 * Are we loading a blank journal or performing recovery after a
3171 * crash? For recovery, we need to check in advance whether we
3172 * can get read-write access to the device.
3174 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3175 if (sb
->s_flags
& MS_RDONLY
) {
3176 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
3177 "required on readonly filesystem");
3178 if (really_read_only
) {
3179 ext4_msg(sb
, KERN_ERR
, "write access "
3180 "unavailable, cannot proceed");
3183 ext4_msg(sb
, KERN_INFO
, "write access will "
3184 "be enabled during recovery");
3188 if (journal_inum
&& journal_dev
) {
3189 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
3190 "and inode journals!");
3195 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
3198 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
3202 if (!(journal
->j_flags
& JBD2_BARRIER
))
3203 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
3205 if (!really_read_only
&& test_opt(sb
, UPDATE_JOURNAL
)) {
3206 err
= jbd2_journal_update_format(journal
);
3208 ext4_msg(sb
, KERN_ERR
, "error updating journal");
3209 jbd2_journal_destroy(journal
);
3214 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
3215 err
= jbd2_journal_wipe(journal
, !really_read_only
);
3217 err
= jbd2_journal_load(journal
);
3220 ext4_msg(sb
, KERN_ERR
, "error loading journal");
3221 jbd2_journal_destroy(journal
);
3225 EXT4_SB(sb
)->s_journal
= journal
;
3226 ext4_clear_journal_err(sb
, es
);
3228 if (journal_devnum
&&
3229 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3230 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
3232 /* Make sure we flush the recovery flag to disk. */
3233 ext4_commit_super(sb
, 1);
3239 static int ext4_commit_super(struct super_block
*sb
, int sync
)
3241 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
3242 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
3247 if (buffer_write_io_error(sbh
)) {
3249 * Oh, dear. A previous attempt to write the
3250 * superblock failed. This could happen because the
3251 * USB device was yanked out. Or it could happen to
3252 * be a transient write error and maybe the block will
3253 * be remapped. Nothing we can do but to retry the
3254 * write and hope for the best.
3256 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
3257 "superblock detected");
3258 clear_buffer_write_io_error(sbh
);
3259 set_buffer_uptodate(sbh
);
3262 * If the file system is mounted read-only, don't update the
3263 * superblock write time. This avoids updating the superblock
3264 * write time when we are mounting the root file system
3265 * read/only but we need to replay the journal; at that point,
3266 * for people who are east of GMT and who make their clock
3267 * tick in localtime for Windows bug-for-bug compatibility,
3268 * the clock is set in the future, and this will cause e2fsck
3269 * to complain and force a full file system check.
3271 if (!(sb
->s_flags
& MS_RDONLY
))
3272 es
->s_wtime
= cpu_to_le32(get_seconds());
3273 es
->s_kbytes_written
=
3274 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
3275 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
3276 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
3277 ext4_free_blocks_count_set(es
, percpu_counter_sum_positive(
3278 &EXT4_SB(sb
)->s_freeblocks_counter
));
3279 es
->s_free_inodes_count
= cpu_to_le32(percpu_counter_sum_positive(
3280 &EXT4_SB(sb
)->s_freeinodes_counter
));
3282 BUFFER_TRACE(sbh
, "marking dirty");
3283 mark_buffer_dirty(sbh
);
3285 error
= sync_dirty_buffer(sbh
);
3289 error
= buffer_write_io_error(sbh
);
3291 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
3293 clear_buffer_write_io_error(sbh
);
3294 set_buffer_uptodate(sbh
);
3301 * Have we just finished recovery? If so, and if we are mounting (or
3302 * remounting) the filesystem readonly, then we will end up with a
3303 * consistent fs on disk. Record that fact.
3305 static void ext4_mark_recovery_complete(struct super_block
*sb
,
3306 struct ext4_super_block
*es
)
3308 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
3310 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
3311 BUG_ON(journal
!= NULL
);
3314 jbd2_journal_lock_updates(journal
);
3315 if (jbd2_journal_flush(journal
) < 0)
3318 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
3319 sb
->s_flags
& MS_RDONLY
) {
3320 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3321 ext4_commit_super(sb
, 1);
3325 jbd2_journal_unlock_updates(journal
);
3329 * If we are mounting (or read-write remounting) a filesystem whose journal
3330 * has recorded an error from a previous lifetime, move that error to the
3331 * main filesystem now.
3333 static void ext4_clear_journal_err(struct super_block
*sb
,
3334 struct ext4_super_block
*es
)
3340 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3342 journal
= EXT4_SB(sb
)->s_journal
;
3345 * Now check for any error status which may have been recorded in the
3346 * journal by a prior ext4_error() or ext4_abort()
3349 j_errno
= jbd2_journal_errno(journal
);
3353 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
3354 ext4_warning(sb
, __func__
, "Filesystem error recorded "
3355 "from previous mount: %s", errstr
);
3356 ext4_warning(sb
, __func__
, "Marking fs in need of "
3357 "filesystem check.");
3359 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
3360 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
3361 ext4_commit_super(sb
, 1);
3363 jbd2_journal_clear_err(journal
);
3368 * Force the running and committing transactions to commit,
3369 * and wait on the commit.
3371 int ext4_force_commit(struct super_block
*sb
)
3376 if (sb
->s_flags
& MS_RDONLY
)
3379 journal
= EXT4_SB(sb
)->s_journal
;
3381 ret
= ext4_journal_force_commit(journal
);
3386 static void ext4_write_super(struct super_block
*sb
)
3389 ext4_commit_super(sb
, 1);
3393 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
3397 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3399 trace_ext4_sync_fs(sb
, wait
);
3400 flush_workqueue(sbi
->dio_unwritten_wq
);
3401 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
3403 jbd2_log_wait_commit(sbi
->s_journal
, target
);
3409 * LVM calls this function before a (read-only) snapshot is created. This
3410 * gives us a chance to flush the journal completely and mark the fs clean.
3412 static int ext4_freeze(struct super_block
*sb
)
3417 if (sb
->s_flags
& MS_RDONLY
)
3420 journal
= EXT4_SB(sb
)->s_journal
;
3422 /* Now we set up the journal barrier. */
3423 jbd2_journal_lock_updates(journal
);
3426 * Don't clear the needs_recovery flag if we failed to flush
3429 error
= jbd2_journal_flush(journal
);
3432 jbd2_journal_unlock_updates(journal
);
3436 /* Journal blocked and flushed, clear needs_recovery flag. */
3437 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3438 error
= ext4_commit_super(sb
, 1);
3445 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3446 * flag here, even though the filesystem is not technically dirty yet.
3448 static int ext4_unfreeze(struct super_block
*sb
)
3450 if (sb
->s_flags
& MS_RDONLY
)
3454 /* Reset the needs_recovery flag before the fs is unlocked. */
3455 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3456 ext4_commit_super(sb
, 1);
3458 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
3462 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
3464 struct ext4_super_block
*es
;
3465 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3466 ext4_fsblk_t n_blocks_count
= 0;
3467 unsigned long old_sb_flags
;
3468 struct ext4_mount_options old_opts
;
3470 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3478 /* Store the original options */
3480 old_sb_flags
= sb
->s_flags
;
3481 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
3482 old_opts
.s_resuid
= sbi
->s_resuid
;
3483 old_opts
.s_resgid
= sbi
->s_resgid
;
3484 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
3485 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
3486 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
3488 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
3489 for (i
= 0; i
< MAXQUOTAS
; i
++)
3490 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
3492 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
3493 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
3496 * Allow the "check" option to be passed as a remount option.
3498 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
,
3499 &n_blocks_count
, 1)) {
3504 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
3505 ext4_abort(sb
, __func__
, "Abort forced by user");
3507 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3508 ((sbi
->s_mount_opt
& EXT4_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
3512 if (sbi
->s_journal
) {
3513 ext4_init_journal_params(sb
, sbi
->s_journal
);
3514 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
3517 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
) ||
3518 n_blocks_count
> ext4_blocks_count(es
)) {
3519 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
3524 if (*flags
& MS_RDONLY
) {
3526 * First of all, the unconditional stuff we have to do
3527 * to disable replay of the journal when we next remount
3529 sb
->s_flags
|= MS_RDONLY
;
3532 * OK, test if we are remounting a valid rw partition
3533 * readonly, and if so set the rdonly flag and then
3534 * mark the partition as valid again.
3536 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
3537 (sbi
->s_mount_state
& EXT4_VALID_FS
))
3538 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
3541 ext4_mark_recovery_complete(sb
, es
);
3543 /* Make sure we can mount this feature set readwrite */
3544 if (!ext4_feature_set_ok(sb
, 0)) {
3549 * Make sure the group descriptor checksums
3550 * are sane. If they aren't, refuse to remount r/w.
3552 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
3553 struct ext4_group_desc
*gdp
=
3554 ext4_get_group_desc(sb
, g
, NULL
);
3556 if (!ext4_group_desc_csum_verify(sbi
, g
, gdp
)) {
3557 ext4_msg(sb
, KERN_ERR
,
3558 "ext4_remount: Checksum for group %u failed (%u!=%u)",
3559 g
, le16_to_cpu(ext4_group_desc_csum(sbi
, g
, gdp
)),
3560 le16_to_cpu(gdp
->bg_checksum
));
3567 * If we have an unprocessed orphan list hanging
3568 * around from a previously readonly bdev mount,
3569 * require a full umount/remount for now.
3571 if (es
->s_last_orphan
) {
3572 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
3573 "remount RDWR because of unprocessed "
3574 "orphan inode list. Please "
3575 "umount/remount instead");
3581 * Mounting a RDONLY partition read-write, so reread
3582 * and store the current valid flag. (It may have
3583 * been changed by e2fsck since we originally mounted
3587 ext4_clear_journal_err(sb
, es
);
3588 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3589 if ((err
= ext4_group_extend(sb
, es
, n_blocks_count
)))
3591 if (!ext4_setup_super(sb
, es
, 0))
3592 sb
->s_flags
&= ~MS_RDONLY
;
3595 ext4_setup_system_zone(sb
);
3596 if (sbi
->s_journal
== NULL
)
3597 ext4_commit_super(sb
, 1);
3600 /* Release old quota file names */
3601 for (i
= 0; i
< MAXQUOTAS
; i
++)
3602 if (old_opts
.s_qf_names
[i
] &&
3603 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3604 kfree(old_opts
.s_qf_names
[i
]);
3611 sb
->s_flags
= old_sb_flags
;
3612 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
3613 sbi
->s_resuid
= old_opts
.s_resuid
;
3614 sbi
->s_resgid
= old_opts
.s_resgid
;
3615 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
3616 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
3617 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
3619 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
3620 for (i
= 0; i
< MAXQUOTAS
; i
++) {
3621 if (sbi
->s_qf_names
[i
] &&
3622 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3623 kfree(sbi
->s_qf_names
[i
]);
3624 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
3632 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
3634 struct super_block
*sb
= dentry
->d_sb
;
3635 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3636 struct ext4_super_block
*es
= sbi
->s_es
;
3639 if (test_opt(sb
, MINIX_DF
)) {
3640 sbi
->s_overhead_last
= 0;
3641 } else if (sbi
->s_blocks_last
!= ext4_blocks_count(es
)) {
3642 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3643 ext4_fsblk_t overhead
= 0;
3646 * Compute the overhead (FS structures). This is constant
3647 * for a given filesystem unless the number of block groups
3648 * changes so we cache the previous value until it does.
3652 * All of the blocks before first_data_block are
3655 overhead
= le32_to_cpu(es
->s_first_data_block
);
3658 * Add the overhead attributed to the superblock and
3659 * block group descriptors. If the sparse superblocks
3660 * feature is turned on, then not all groups have this.
3662 for (i
= 0; i
< ngroups
; i
++) {
3663 overhead
+= ext4_bg_has_super(sb
, i
) +
3664 ext4_bg_num_gdb(sb
, i
);
3669 * Every block group has an inode bitmap, a block
3670 * bitmap, and an inode table.
3672 overhead
+= ngroups
* (2 + sbi
->s_itb_per_group
);
3673 sbi
->s_overhead_last
= overhead
;
3675 sbi
->s_blocks_last
= ext4_blocks_count(es
);
3678 buf
->f_type
= EXT4_SUPER_MAGIC
;
3679 buf
->f_bsize
= sb
->s_blocksize
;
3680 buf
->f_blocks
= ext4_blocks_count(es
) - sbi
->s_overhead_last
;
3681 buf
->f_bfree
= percpu_counter_sum_positive(&sbi
->s_freeblocks_counter
) -
3682 percpu_counter_sum_positive(&sbi
->s_dirtyblocks_counter
);
3683 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
3684 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
3686 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
3687 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
3688 buf
->f_namelen
= EXT4_NAME_LEN
;
3689 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
3690 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
3691 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
3692 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
3697 /* Helper function for writing quotas on sync - we need to start transaction
3698 * before quota file is locked for write. Otherwise the are possible deadlocks:
3699 * Process 1 Process 2
3700 * ext4_create() quota_sync()
3701 * jbd2_journal_start() write_dquot()
3702 * dquot_initialize() down(dqio_mutex)
3703 * down(dqio_mutex) jbd2_journal_start()
3709 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
3711 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_type
];
3714 static int ext4_write_dquot(struct dquot
*dquot
)
3718 struct inode
*inode
;
3720 inode
= dquot_to_inode(dquot
);
3721 handle
= ext4_journal_start(inode
,
3722 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
3724 return PTR_ERR(handle
);
3725 ret
= dquot_commit(dquot
);
3726 err
= ext4_journal_stop(handle
);
3732 static int ext4_acquire_dquot(struct dquot
*dquot
)
3737 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3738 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
3740 return PTR_ERR(handle
);
3741 ret
= dquot_acquire(dquot
);
3742 err
= ext4_journal_stop(handle
);
3748 static int ext4_release_dquot(struct dquot
*dquot
)
3753 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3754 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
3755 if (IS_ERR(handle
)) {
3756 /* Release dquot anyway to avoid endless cycle in dqput() */
3757 dquot_release(dquot
);
3758 return PTR_ERR(handle
);
3760 ret
= dquot_release(dquot
);
3761 err
= ext4_journal_stop(handle
);
3767 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
3769 /* Are we journaling quotas? */
3770 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
3771 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
3772 dquot_mark_dquot_dirty(dquot
);
3773 return ext4_write_dquot(dquot
);
3775 return dquot_mark_dquot_dirty(dquot
);
3779 static int ext4_write_info(struct super_block
*sb
, int type
)
3784 /* Data block + inode block */
3785 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
3787 return PTR_ERR(handle
);
3788 ret
= dquot_commit_info(sb
, type
);
3789 err
= ext4_journal_stop(handle
);
3796 * Turn on quotas during mount time - we need to find
3797 * the quota file and such...
3799 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
3801 return vfs_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
3802 EXT4_SB(sb
)->s_jquota_fmt
, type
);
3806 * Standard function to be called on quota_on
3808 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
3809 char *name
, int remount
)
3814 if (!test_opt(sb
, QUOTA
))
3816 /* When remounting, no checks are needed and in fact, name is NULL */
3818 return vfs_quota_on(sb
, type
, format_id
, name
, remount
);
3820 err
= kern_path(name
, LOOKUP_FOLLOW
, &path
);
3824 /* Quotafile not on the same filesystem? */
3825 if (path
.mnt
->mnt_sb
!= sb
) {
3829 /* Journaling quota? */
3830 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
3831 /* Quotafile not in fs root? */
3832 if (path
.dentry
->d_parent
!= sb
->s_root
)
3833 ext4_msg(sb
, KERN_WARNING
,
3834 "Quota file not on filesystem root. "
3835 "Journaled quota will not work");
3839 * When we journal data on quota file, we have to flush journal to see
3840 * all updates to the file when we bypass pagecache...
3842 if (EXT4_SB(sb
)->s_journal
&&
3843 ext4_should_journal_data(path
.dentry
->d_inode
)) {
3845 * We don't need to lock updates but journal_flush() could
3846 * otherwise be livelocked...
3848 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
3849 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
3850 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
3857 err
= vfs_quota_on_path(sb
, type
, format_id
, &path
);
3862 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3863 * acquiring the locks... As quota files are never truncated and quota code
3864 * itself serializes the operations (and noone else should touch the files)
3865 * we don't have to be afraid of races */
3866 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
3867 size_t len
, loff_t off
)
3869 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
3870 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
3872 int offset
= off
& (sb
->s_blocksize
- 1);
3875 struct buffer_head
*bh
;
3876 loff_t i_size
= i_size_read(inode
);
3880 if (off
+len
> i_size
)
3883 while (toread
> 0) {
3884 tocopy
= sb
->s_blocksize
- offset
< toread
?
3885 sb
->s_blocksize
- offset
: toread
;
3886 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
3889 if (!bh
) /* A hole? */
3890 memset(data
, 0, tocopy
);
3892 memcpy(data
, bh
->b_data
+offset
, tocopy
);
3902 /* Write to quotafile (we know the transaction is already started and has
3903 * enough credits) */
3904 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
3905 const char *data
, size_t len
, loff_t off
)
3907 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
3908 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
3910 int offset
= off
& (sb
->s_blocksize
- 1);
3912 int journal_quota
= EXT4_SB(sb
)->s_qf_names
[type
] != NULL
;
3913 size_t towrite
= len
;
3914 struct buffer_head
*bh
;
3915 handle_t
*handle
= journal_current_handle();
3917 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
3918 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
3919 " cancelled because transaction is not started",
3920 (unsigned long long)off
, (unsigned long long)len
);
3923 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
3924 while (towrite
> 0) {
3925 tocopy
= sb
->s_blocksize
- offset
< towrite
?
3926 sb
->s_blocksize
- offset
: towrite
;
3927 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
3930 if (journal_quota
) {
3931 err
= ext4_journal_get_write_access(handle
, bh
);
3938 memcpy(bh
->b_data
+offset
, data
, tocopy
);
3939 flush_dcache_page(bh
->b_page
);
3942 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
3944 /* Always do at least ordered writes for quotas */
3945 err
= ext4_jbd2_file_inode(handle
, inode
);
3946 mark_buffer_dirty(bh
);
3957 if (len
== towrite
) {
3958 mutex_unlock(&inode
->i_mutex
);
3961 if (inode
->i_size
< off
+len
-towrite
) {
3962 i_size_write(inode
, off
+len
-towrite
);
3963 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
3965 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
3966 ext4_mark_inode_dirty(handle
, inode
);
3967 mutex_unlock(&inode
->i_mutex
);
3968 return len
- towrite
;
3973 static int ext4_get_sb(struct file_system_type
*fs_type
, int flags
,
3974 const char *dev_name
, void *data
, struct vfsmount
*mnt
)
3976 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
,mnt
);
3979 #if !defined(CONTIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
3980 static struct file_system_type ext2_fs_type
= {
3981 .owner
= THIS_MODULE
,
3983 .get_sb
= ext4_get_sb
,
3984 .kill_sb
= kill_block_super
,
3985 .fs_flags
= FS_REQUIRES_DEV
,
3988 static inline void register_as_ext2(void)
3990 int err
= register_filesystem(&ext2_fs_type
);
3993 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
3996 static inline void unregister_as_ext2(void)
3998 unregister_filesystem(&ext2_fs_type
);
4000 MODULE_ALIAS("ext2");
4002 static inline void register_as_ext2(void) { }
4003 static inline void unregister_as_ext2(void) { }
4006 #if !defined(CONTIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4007 static struct file_system_type ext3_fs_type
= {
4008 .owner
= THIS_MODULE
,
4010 .get_sb
= ext4_get_sb
,
4011 .kill_sb
= kill_block_super
,
4012 .fs_flags
= FS_REQUIRES_DEV
,
4015 static inline void register_as_ext3(void)
4017 int err
= register_filesystem(&ext3_fs_type
);
4020 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
4023 static inline void unregister_as_ext3(void)
4025 unregister_filesystem(&ext3_fs_type
);
4027 MODULE_ALIAS("ext3");
4029 static inline void register_as_ext3(void) { }
4030 static inline void unregister_as_ext3(void) { }
4033 static struct file_system_type ext4_fs_type
= {
4034 .owner
= THIS_MODULE
,
4036 .get_sb
= ext4_get_sb
,
4037 .kill_sb
= kill_block_super
,
4038 .fs_flags
= FS_REQUIRES_DEV
,
4041 static int __init
init_ext4_fs(void)
4045 err
= init_ext4_system_zone();
4048 ext4_kset
= kset_create_and_add("ext4", NULL
, fs_kobj
);
4051 ext4_proc_root
= proc_mkdir("fs/ext4", NULL
);
4052 err
= init_ext4_mballoc();
4056 err
= init_ext4_xattr();
4059 err
= init_inodecache();
4064 err
= register_filesystem(&ext4_fs_type
);
4069 unregister_as_ext2();
4070 unregister_as_ext3();
4071 destroy_inodecache();
4075 exit_ext4_mballoc();
4077 remove_proc_entry("fs/ext4", NULL
);
4078 kset_unregister(ext4_kset
);
4080 exit_ext4_system_zone();
4084 static void __exit
exit_ext4_fs(void)
4086 unregister_as_ext2();
4087 unregister_as_ext3();
4088 unregister_filesystem(&ext4_fs_type
);
4089 destroy_inodecache();
4091 exit_ext4_mballoc();
4092 remove_proc_entry("fs/ext4", NULL
);
4093 kset_unregister(ext4_kset
);
4094 exit_ext4_system_zone();
4097 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4098 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4099 MODULE_LICENSE("GPL");
4100 module_init(init_ext4_fs
)
4101 module_exit(exit_ext4_fs
)