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/marker.h>
41 #include <linux/log2.h>
42 #include <linux/crc16.h>
43 #include <asm/uaccess.h>
46 #include "ext4_jbd2.h"
50 static int default_mb_history_length
= 1000;
52 module_param_named(default_mb_history_length
, default_mb_history_length
,
54 MODULE_PARM_DESC(default_mb_history_length
,
55 "Default number of entries saved for mb_history");
57 struct proc_dir_entry
*ext4_proc_root
;
58 static struct kset
*ext4_kset
;
60 static int ext4_load_journal(struct super_block
*, struct ext4_super_block
*,
61 unsigned long journal_devnum
);
62 static int ext4_commit_super(struct super_block
*sb
, int sync
);
63 static void ext4_mark_recovery_complete(struct super_block
*sb
,
64 struct ext4_super_block
*es
);
65 static void ext4_clear_journal_err(struct super_block
*sb
,
66 struct ext4_super_block
*es
);
67 static int ext4_sync_fs(struct super_block
*sb
, int wait
);
68 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
70 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
);
71 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
);
72 static int ext4_unfreeze(struct super_block
*sb
);
73 static void ext4_write_super(struct super_block
*sb
);
74 static int ext4_freeze(struct super_block
*sb
);
77 ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
78 struct ext4_group_desc
*bg
)
80 return le32_to_cpu(bg
->bg_block_bitmap_lo
) |
81 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
82 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
85 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
86 struct ext4_group_desc
*bg
)
88 return le32_to_cpu(bg
->bg_inode_bitmap_lo
) |
89 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
90 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
93 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
94 struct ext4_group_desc
*bg
)
96 return le32_to_cpu(bg
->bg_inode_table_lo
) |
97 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
98 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
101 __u32
ext4_free_blks_count(struct super_block
*sb
,
102 struct ext4_group_desc
*bg
)
104 return le16_to_cpu(bg
->bg_free_blocks_count_lo
) |
105 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
106 (__u32
)le16_to_cpu(bg
->bg_free_blocks_count_hi
) << 16 : 0);
109 __u32
ext4_free_inodes_count(struct super_block
*sb
,
110 struct ext4_group_desc
*bg
)
112 return le16_to_cpu(bg
->bg_free_inodes_count_lo
) |
113 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
114 (__u32
)le16_to_cpu(bg
->bg_free_inodes_count_hi
) << 16 : 0);
117 __u32
ext4_used_dirs_count(struct super_block
*sb
,
118 struct ext4_group_desc
*bg
)
120 return le16_to_cpu(bg
->bg_used_dirs_count_lo
) |
121 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
122 (__u32
)le16_to_cpu(bg
->bg_used_dirs_count_hi
) << 16 : 0);
125 __u32
ext4_itable_unused_count(struct super_block
*sb
,
126 struct ext4_group_desc
*bg
)
128 return le16_to_cpu(bg
->bg_itable_unused_lo
) |
129 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
130 (__u32
)le16_to_cpu(bg
->bg_itable_unused_hi
) << 16 : 0);
133 void ext4_block_bitmap_set(struct super_block
*sb
,
134 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
136 bg
->bg_block_bitmap_lo
= cpu_to_le32((u32
)blk
);
137 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
138 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
141 void ext4_inode_bitmap_set(struct super_block
*sb
,
142 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
144 bg
->bg_inode_bitmap_lo
= cpu_to_le32((u32
)blk
);
145 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
146 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
149 void ext4_inode_table_set(struct super_block
*sb
,
150 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
152 bg
->bg_inode_table_lo
= cpu_to_le32((u32
)blk
);
153 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
154 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
157 void ext4_free_blks_set(struct super_block
*sb
,
158 struct ext4_group_desc
*bg
, __u32 count
)
160 bg
->bg_free_blocks_count_lo
= cpu_to_le16((__u16
)count
);
161 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
162 bg
->bg_free_blocks_count_hi
= cpu_to_le16(count
>> 16);
165 void ext4_free_inodes_set(struct super_block
*sb
,
166 struct ext4_group_desc
*bg
, __u32 count
)
168 bg
->bg_free_inodes_count_lo
= cpu_to_le16((__u16
)count
);
169 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
170 bg
->bg_free_inodes_count_hi
= cpu_to_le16(count
>> 16);
173 void ext4_used_dirs_set(struct super_block
*sb
,
174 struct ext4_group_desc
*bg
, __u32 count
)
176 bg
->bg_used_dirs_count_lo
= cpu_to_le16((__u16
)count
);
177 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
178 bg
->bg_used_dirs_count_hi
= cpu_to_le16(count
>> 16);
181 void ext4_itable_unused_set(struct super_block
*sb
,
182 struct ext4_group_desc
*bg
, __u32 count
)
184 bg
->bg_itable_unused_lo
= cpu_to_le16((__u16
)count
);
185 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
186 bg
->bg_itable_unused_hi
= cpu_to_le16(count
>> 16);
190 * Wrappers for jbd2_journal_start/end.
192 * The only special thing we need to do here is to make sure that all
193 * journal_end calls result in the superblock being marked dirty, so
194 * that sync() will call the filesystem's write_super callback if
197 handle_t
*ext4_journal_start_sb(struct super_block
*sb
, int nblocks
)
201 if (sb
->s_flags
& MS_RDONLY
)
202 return ERR_PTR(-EROFS
);
204 /* Special case here: if the journal has aborted behind our
205 * backs (eg. EIO in the commit thread), then we still need to
206 * take the FS itself readonly cleanly. */
207 journal
= EXT4_SB(sb
)->s_journal
;
209 if (is_journal_aborted(journal
)) {
210 ext4_abort(sb
, __func__
,
211 "Detected aborted journal");
212 return ERR_PTR(-EROFS
);
214 return jbd2_journal_start(journal
, nblocks
);
217 * We're not journaling, return the appropriate indication.
219 current
->journal_info
= EXT4_NOJOURNAL_HANDLE
;
220 return current
->journal_info
;
224 * The only special thing we need to do here is to make sure that all
225 * jbd2_journal_stop calls result in the superblock being marked dirty, so
226 * that sync() will call the filesystem's write_super callback if
229 int __ext4_journal_stop(const char *where
, handle_t
*handle
)
231 struct super_block
*sb
;
235 if (!ext4_handle_valid(handle
)) {
237 * Do this here since we don't call jbd2_journal_stop() in
240 current
->journal_info
= NULL
;
243 sb
= handle
->h_transaction
->t_journal
->j_private
;
245 rc
= jbd2_journal_stop(handle
);
250 __ext4_std_error(sb
, where
, err
);
254 void ext4_journal_abort_handle(const char *caller
, const char *err_fn
,
255 struct buffer_head
*bh
, handle_t
*handle
, int err
)
258 const char *errstr
= ext4_decode_error(NULL
, err
, nbuf
);
260 BUG_ON(!ext4_handle_valid(handle
));
263 BUFFER_TRACE(bh
, "abort");
268 if (is_handle_aborted(handle
))
271 printk(KERN_ERR
"%s: aborting transaction: %s in %s\n",
272 caller
, errstr
, err_fn
);
274 jbd2_journal_abort_handle(handle
);
277 /* Deal with the reporting of failure conditions on a filesystem such as
278 * inconsistencies detected or read IO failures.
280 * On ext2, we can store the error state of the filesystem in the
281 * superblock. That is not possible on ext4, because we may have other
282 * write ordering constraints on the superblock which prevent us from
283 * writing it out straight away; and given that the journal is about to
284 * be aborted, we can't rely on the current, or future, transactions to
285 * write out the superblock safely.
287 * We'll just use the jbd2_journal_abort() error code to record an error in
288 * the journal instead. On recovery, the journal will compain about
289 * that error until we've noted it down and cleared it.
292 static void ext4_handle_error(struct super_block
*sb
)
294 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
296 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
297 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
299 if (sb
->s_flags
& MS_RDONLY
)
302 if (!test_opt(sb
, ERRORS_CONT
)) {
303 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
305 EXT4_SB(sb
)->s_mount_opt
|= EXT4_MOUNT_ABORT
;
307 jbd2_journal_abort(journal
, -EIO
);
309 if (test_opt(sb
, ERRORS_RO
)) {
310 printk(KERN_CRIT
"Remounting filesystem read-only\n");
311 sb
->s_flags
|= MS_RDONLY
;
313 ext4_commit_super(sb
, 1);
314 if (test_opt(sb
, ERRORS_PANIC
))
315 panic("EXT4-fs (device %s): panic forced after error\n",
319 void ext4_error(struct super_block
*sb
, const char *function
,
320 const char *fmt
, ...)
325 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
330 ext4_handle_error(sb
);
333 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
340 errstr
= "IO failure";
343 errstr
= "Out of memory";
346 if (!sb
|| EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
)
347 errstr
= "Journal has aborted";
349 errstr
= "Readonly filesystem";
352 /* If the caller passed in an extra buffer for unknown
353 * errors, textualise them now. Else we just return
356 /* Check for truncated error codes... */
357 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
366 /* __ext4_std_error decodes expected errors from journaling functions
367 * automatically and invokes the appropriate error response. */
369 void __ext4_std_error(struct super_block
*sb
, const char *function
, int errno
)
374 /* Special case: if the error is EROFS, and we're not already
375 * inside a transaction, then there's really no point in logging
377 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
378 (sb
->s_flags
& MS_RDONLY
))
381 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
382 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s: %s\n",
383 sb
->s_id
, function
, errstr
);
385 ext4_handle_error(sb
);
389 * ext4_abort is a much stronger failure handler than ext4_error. The
390 * abort function may be used to deal with unrecoverable failures such
391 * as journal IO errors or ENOMEM at a critical moment in log management.
393 * We unconditionally force the filesystem into an ABORT|READONLY state,
394 * unless the error response on the fs has been set to panic in which
395 * case we take the easy way out and panic immediately.
398 void ext4_abort(struct super_block
*sb
, const char *function
,
399 const char *fmt
, ...)
403 printk(KERN_CRIT
"ext4_abort called.\n");
406 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
411 if (test_opt(sb
, ERRORS_PANIC
))
412 panic("EXT4-fs panic from previous error\n");
414 if (sb
->s_flags
& MS_RDONLY
)
417 printk(KERN_CRIT
"Remounting filesystem read-only\n");
418 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
419 sb
->s_flags
|= MS_RDONLY
;
420 EXT4_SB(sb
)->s_mount_opt
|= EXT4_MOUNT_ABORT
;
421 if (EXT4_SB(sb
)->s_journal
)
422 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
425 void ext4_warning(struct super_block
*sb
, const char *function
,
426 const char *fmt
, ...)
431 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s: ",
438 void ext4_grp_locked_error(struct super_block
*sb
, ext4_group_t grp
,
439 const char *function
, const char *fmt
, ...)
444 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
447 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
452 if (test_opt(sb
, ERRORS_CONT
)) {
453 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
454 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
455 ext4_commit_super(sb
, 0);
458 ext4_unlock_group(sb
, grp
);
459 ext4_handle_error(sb
);
461 * We only get here in the ERRORS_RO case; relocking the group
462 * may be dangerous, but nothing bad will happen since the
463 * filesystem will have already been marked read/only and the
464 * journal has been aborted. We return 1 as a hint to callers
465 * who might what to use the return value from
466 * ext4_grp_locked_error() to distinguish beween the
467 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
468 * aggressively from the ext4 function in question, with a
469 * more appropriate error code.
471 ext4_lock_group(sb
, grp
);
476 void ext4_update_dynamic_rev(struct super_block
*sb
)
478 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
480 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
483 ext4_warning(sb
, __func__
,
484 "updating to rev %d because of new feature flag, "
485 "running e2fsck is recommended",
488 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
489 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
490 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
491 /* leave es->s_feature_*compat flags alone */
492 /* es->s_uuid will be set by e2fsck if empty */
495 * The rest of the superblock fields should be zero, and if not it
496 * means they are likely already in use, so leave them alone. We
497 * can leave it up to e2fsck to clean up any inconsistencies there.
502 * Open the external journal device
504 static struct block_device
*ext4_blkdev_get(dev_t dev
)
506 struct block_device
*bdev
;
507 char b
[BDEVNAME_SIZE
];
509 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
515 printk(KERN_ERR
"EXT4-fs: failed to open journal device %s: %ld\n",
516 __bdevname(dev
, b
), PTR_ERR(bdev
));
521 * Release the journal device
523 static int ext4_blkdev_put(struct block_device
*bdev
)
526 return blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
529 static int ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
531 struct block_device
*bdev
;
534 bdev
= sbi
->journal_bdev
;
536 ret
= ext4_blkdev_put(bdev
);
537 sbi
->journal_bdev
= NULL
;
542 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
544 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
547 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
551 printk(KERN_ERR
"sb orphan head is %d\n",
552 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
554 printk(KERN_ERR
"sb_info orphan list:\n");
555 list_for_each(l
, &sbi
->s_orphan
) {
556 struct inode
*inode
= orphan_list_entry(l
);
558 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
559 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
560 inode
->i_mode
, inode
->i_nlink
,
565 static void ext4_put_super(struct super_block
*sb
)
567 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
568 struct ext4_super_block
*es
= sbi
->s_es
;
572 ext4_ext_release(sb
);
573 ext4_xattr_put_super(sb
);
574 if (sbi
->s_journal
) {
575 err
= jbd2_journal_destroy(sbi
->s_journal
);
576 sbi
->s_journal
= NULL
;
578 ext4_abort(sb
, __func__
,
579 "Couldn't clean up the journal");
581 if (!(sb
->s_flags
& MS_RDONLY
)) {
582 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
583 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
584 ext4_commit_super(sb
, 1);
587 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
589 kobject_del(&sbi
->s_kobj
);
591 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
592 brelse(sbi
->s_group_desc
[i
]);
593 kfree(sbi
->s_group_desc
);
594 if (is_vmalloc_addr(sbi
->s_flex_groups
))
595 vfree(sbi
->s_flex_groups
);
597 kfree(sbi
->s_flex_groups
);
598 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
599 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
600 percpu_counter_destroy(&sbi
->s_dirs_counter
);
601 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
604 for (i
= 0; i
< MAXQUOTAS
; i
++)
605 kfree(sbi
->s_qf_names
[i
]);
608 /* Debugging code just in case the in-memory inode orphan list
609 * isn't empty. The on-disk one can be non-empty if we've
610 * detected an error and taken the fs readonly, but the
611 * in-memory list had better be clean by this point. */
612 if (!list_empty(&sbi
->s_orphan
))
613 dump_orphan_list(sb
, sbi
);
614 J_ASSERT(list_empty(&sbi
->s_orphan
));
616 invalidate_bdev(sb
->s_bdev
);
617 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
619 * Invalidate the journal device's buffers. We don't want them
620 * floating about in memory - the physical journal device may
621 * hotswapped, and it breaks the `ro-after' testing code.
623 sync_blockdev(sbi
->journal_bdev
);
624 invalidate_bdev(sbi
->journal_bdev
);
625 ext4_blkdev_remove(sbi
);
627 sb
->s_fs_info
= NULL
;
629 * Now that we are completely done shutting down the
630 * superblock, we need to actually destroy the kobject.
634 kobject_put(&sbi
->s_kobj
);
635 wait_for_completion(&sbi
->s_kobj_unregister
);
638 kfree(sbi
->s_blockgroup_lock
);
643 static struct kmem_cache
*ext4_inode_cachep
;
646 * Called inside transaction, so use GFP_NOFS
648 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
650 struct ext4_inode_info
*ei
;
652 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
655 #ifdef CONFIG_EXT4_FS_POSIX_ACL
656 ei
->i_acl
= EXT4_ACL_NOT_CACHED
;
657 ei
->i_default_acl
= EXT4_ACL_NOT_CACHED
;
659 ei
->vfs_inode
.i_version
= 1;
660 ei
->vfs_inode
.i_data
.writeback_index
= 0;
661 memset(&ei
->i_cached_extent
, 0, sizeof(struct ext4_ext_cache
));
662 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
663 spin_lock_init(&ei
->i_prealloc_lock
);
665 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
666 * therefore it can be null here. Don't check it, just initialize
669 jbd2_journal_init_jbd_inode(&ei
->jinode
, &ei
->vfs_inode
);
670 ei
->i_reserved_data_blocks
= 0;
671 ei
->i_reserved_meta_blocks
= 0;
672 ei
->i_allocated_meta_blocks
= 0;
673 ei
->i_delalloc_reserved_flag
= 0;
674 spin_lock_init(&(ei
->i_block_reservation_lock
));
675 return &ei
->vfs_inode
;
678 static void ext4_destroy_inode(struct inode
*inode
)
680 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
681 printk("EXT4 Inode %p: orphan list check failed!\n",
683 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
684 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
688 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
691 static void init_once(void *foo
)
693 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
695 INIT_LIST_HEAD(&ei
->i_orphan
);
696 #ifdef CONFIG_EXT4_FS_XATTR
697 init_rwsem(&ei
->xattr_sem
);
699 init_rwsem(&ei
->i_data_sem
);
700 inode_init_once(&ei
->vfs_inode
);
703 static int init_inodecache(void)
705 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
706 sizeof(struct ext4_inode_info
),
707 0, (SLAB_RECLAIM_ACCOUNT
|
710 if (ext4_inode_cachep
== NULL
)
715 static void destroy_inodecache(void)
717 kmem_cache_destroy(ext4_inode_cachep
);
720 static void ext4_clear_inode(struct inode
*inode
)
722 #ifdef CONFIG_EXT4_FS_POSIX_ACL
723 if (EXT4_I(inode
)->i_acl
&&
724 EXT4_I(inode
)->i_acl
!= EXT4_ACL_NOT_CACHED
) {
725 posix_acl_release(EXT4_I(inode
)->i_acl
);
726 EXT4_I(inode
)->i_acl
= EXT4_ACL_NOT_CACHED
;
728 if (EXT4_I(inode
)->i_default_acl
&&
729 EXT4_I(inode
)->i_default_acl
!= EXT4_ACL_NOT_CACHED
) {
730 posix_acl_release(EXT4_I(inode
)->i_default_acl
);
731 EXT4_I(inode
)->i_default_acl
= EXT4_ACL_NOT_CACHED
;
734 ext4_discard_preallocations(inode
);
735 if (EXT4_JOURNAL(inode
))
736 jbd2_journal_release_jbd_inode(EXT4_SB(inode
->i_sb
)->s_journal
,
737 &EXT4_I(inode
)->jinode
);
740 static inline void ext4_show_quota_options(struct seq_file
*seq
,
741 struct super_block
*sb
)
743 #if defined(CONFIG_QUOTA)
744 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
746 if (sbi
->s_jquota_fmt
)
747 seq_printf(seq
, ",jqfmt=%s",
748 (sbi
->s_jquota_fmt
== QFMT_VFS_OLD
) ? "vfsold" : "vfsv0");
750 if (sbi
->s_qf_names
[USRQUOTA
])
751 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
753 if (sbi
->s_qf_names
[GRPQUOTA
])
754 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
756 if (sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
)
757 seq_puts(seq
, ",usrquota");
759 if (sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
)
760 seq_puts(seq
, ",grpquota");
766 * - it's set to a non-default value OR
767 * - if the per-sb default is different from the global default
769 static int ext4_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
772 unsigned long def_mount_opts
;
773 struct super_block
*sb
= vfs
->mnt_sb
;
774 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
775 struct ext4_super_block
*es
= sbi
->s_es
;
777 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
778 def_errors
= le16_to_cpu(es
->s_errors
);
780 if (sbi
->s_sb_block
!= 1)
781 seq_printf(seq
, ",sb=%llu", sbi
->s_sb_block
);
782 if (test_opt(sb
, MINIX_DF
))
783 seq_puts(seq
, ",minixdf");
784 if (test_opt(sb
, GRPID
) && !(def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
785 seq_puts(seq
, ",grpid");
786 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
787 seq_puts(seq
, ",nogrpid");
788 if (sbi
->s_resuid
!= EXT4_DEF_RESUID
||
789 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
) {
790 seq_printf(seq
, ",resuid=%u", sbi
->s_resuid
);
792 if (sbi
->s_resgid
!= EXT4_DEF_RESGID
||
793 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
) {
794 seq_printf(seq
, ",resgid=%u", sbi
->s_resgid
);
796 if (test_opt(sb
, ERRORS_RO
)) {
797 if (def_errors
== EXT4_ERRORS_PANIC
||
798 def_errors
== EXT4_ERRORS_CONTINUE
) {
799 seq_puts(seq
, ",errors=remount-ro");
802 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
803 seq_puts(seq
, ",errors=continue");
804 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
805 seq_puts(seq
, ",errors=panic");
806 if (test_opt(sb
, NO_UID32
) && !(def_mount_opts
& EXT4_DEFM_UID16
))
807 seq_puts(seq
, ",nouid32");
808 if (test_opt(sb
, DEBUG
) && !(def_mount_opts
& EXT4_DEFM_DEBUG
))
809 seq_puts(seq
, ",debug");
810 if (test_opt(sb
, OLDALLOC
))
811 seq_puts(seq
, ",oldalloc");
812 #ifdef CONFIG_EXT4_FS_XATTR
813 if (test_opt(sb
, XATTR_USER
) &&
814 !(def_mount_opts
& EXT4_DEFM_XATTR_USER
))
815 seq_puts(seq
, ",user_xattr");
816 if (!test_opt(sb
, XATTR_USER
) &&
817 (def_mount_opts
& EXT4_DEFM_XATTR_USER
)) {
818 seq_puts(seq
, ",nouser_xattr");
821 #ifdef CONFIG_EXT4_FS_POSIX_ACL
822 if (test_opt(sb
, POSIX_ACL
) && !(def_mount_opts
& EXT4_DEFM_ACL
))
823 seq_puts(seq
, ",acl");
824 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT4_DEFM_ACL
))
825 seq_puts(seq
, ",noacl");
827 if (sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
) {
828 seq_printf(seq
, ",commit=%u",
829 (unsigned) (sbi
->s_commit_interval
/ HZ
));
831 if (sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
) {
832 seq_printf(seq
, ",min_batch_time=%u",
833 (unsigned) sbi
->s_min_batch_time
);
835 if (sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
) {
836 seq_printf(seq
, ",max_batch_time=%u",
837 (unsigned) sbi
->s_min_batch_time
);
841 * We're changing the default of barrier mount option, so
842 * let's always display its mount state so it's clear what its
845 seq_puts(seq
, ",barrier=");
846 seq_puts(seq
, test_opt(sb
, BARRIER
) ? "1" : "0");
847 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
))
848 seq_puts(seq
, ",journal_async_commit");
849 if (test_opt(sb
, NOBH
))
850 seq_puts(seq
, ",nobh");
851 if (test_opt(sb
, I_VERSION
))
852 seq_puts(seq
, ",i_version");
853 if (!test_opt(sb
, DELALLOC
))
854 seq_puts(seq
, ",nodelalloc");
858 seq_printf(seq
, ",stripe=%lu", sbi
->s_stripe
);
860 * journal mode get enabled in different ways
861 * So just print the value even if we didn't specify it
863 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
864 seq_puts(seq
, ",data=journal");
865 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
866 seq_puts(seq
, ",data=ordered");
867 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
868 seq_puts(seq
, ",data=writeback");
870 if (sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
871 seq_printf(seq
, ",inode_readahead_blks=%u",
872 sbi
->s_inode_readahead_blks
);
874 if (test_opt(sb
, DATA_ERR_ABORT
))
875 seq_puts(seq
, ",data_err=abort");
877 if (test_opt(sb
, NO_AUTO_DA_ALLOC
))
878 seq_puts(seq
, ",noauto_da_alloc");
880 ext4_show_quota_options(seq
, sb
);
885 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
886 u64 ino
, u32 generation
)
890 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
891 return ERR_PTR(-ESTALE
);
892 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
893 return ERR_PTR(-ESTALE
);
895 /* iget isn't really right if the inode is currently unallocated!!
897 * ext4_read_inode will return a bad_inode if the inode had been
898 * deleted, so we should be safe.
900 * Currently we don't know the generation for parent directory, so
901 * a generation of 0 means "accept any"
903 inode
= ext4_iget(sb
, ino
);
905 return ERR_CAST(inode
);
906 if (generation
&& inode
->i_generation
!= generation
) {
908 return ERR_PTR(-ESTALE
);
914 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
915 int fh_len
, int fh_type
)
917 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
921 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
922 int fh_len
, int fh_type
)
924 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
929 * Try to release metadata pages (indirect blocks, directories) which are
930 * mapped via the block device. Since these pages could have journal heads
931 * which would prevent try_to_free_buffers() from freeing them, we must use
932 * jbd2 layer's try_to_free_buffers() function to release them.
934 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
, gfp_t wait
)
936 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
938 WARN_ON(PageChecked(page
));
939 if (!page_has_buffers(page
))
942 return jbd2_journal_try_to_free_buffers(journal
, page
,
944 return try_to_free_buffers(page
);
948 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
949 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
951 static int ext4_write_dquot(struct dquot
*dquot
);
952 static int ext4_acquire_dquot(struct dquot
*dquot
);
953 static int ext4_release_dquot(struct dquot
*dquot
);
954 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
955 static int ext4_write_info(struct super_block
*sb
, int type
);
956 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
957 char *path
, int remount
);
958 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
959 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
960 size_t len
, loff_t off
);
961 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
962 const char *data
, size_t len
, loff_t off
);
964 static struct dquot_operations ext4_quota_operations
= {
965 .initialize
= dquot_initialize
,
967 .alloc_space
= dquot_alloc_space
,
968 .reserve_space
= dquot_reserve_space
,
969 .claim_space
= dquot_claim_space
,
970 .release_rsv
= dquot_release_reserved_space
,
971 .get_reserved_space
= ext4_get_reserved_space
,
972 .alloc_inode
= dquot_alloc_inode
,
973 .free_space
= dquot_free_space
,
974 .free_inode
= dquot_free_inode
,
975 .transfer
= dquot_transfer
,
976 .write_dquot
= ext4_write_dquot
,
977 .acquire_dquot
= ext4_acquire_dquot
,
978 .release_dquot
= ext4_release_dquot
,
979 .mark_dirty
= ext4_mark_dquot_dirty
,
980 .write_info
= ext4_write_info
,
981 .alloc_dquot
= dquot_alloc
,
982 .destroy_dquot
= dquot_destroy
,
985 static struct quotactl_ops ext4_qctl_operations
= {
986 .quota_on
= ext4_quota_on
,
987 .quota_off
= vfs_quota_off
,
988 .quota_sync
= vfs_quota_sync
,
989 .get_info
= vfs_get_dqinfo
,
990 .set_info
= vfs_set_dqinfo
,
991 .get_dqblk
= vfs_get_dqblk
,
992 .set_dqblk
= vfs_set_dqblk
996 static const struct super_operations ext4_sops
= {
997 .alloc_inode
= ext4_alloc_inode
,
998 .destroy_inode
= ext4_destroy_inode
,
999 .write_inode
= ext4_write_inode
,
1000 .dirty_inode
= ext4_dirty_inode
,
1001 .delete_inode
= ext4_delete_inode
,
1002 .put_super
= ext4_put_super
,
1003 .sync_fs
= ext4_sync_fs
,
1004 .freeze_fs
= ext4_freeze
,
1005 .unfreeze_fs
= ext4_unfreeze
,
1006 .statfs
= ext4_statfs
,
1007 .remount_fs
= ext4_remount
,
1008 .clear_inode
= ext4_clear_inode
,
1009 .show_options
= ext4_show_options
,
1011 .quota_read
= ext4_quota_read
,
1012 .quota_write
= ext4_quota_write
,
1014 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1017 static const struct super_operations ext4_nojournal_sops
= {
1018 .alloc_inode
= ext4_alloc_inode
,
1019 .destroy_inode
= ext4_destroy_inode
,
1020 .write_inode
= ext4_write_inode
,
1021 .dirty_inode
= ext4_dirty_inode
,
1022 .delete_inode
= ext4_delete_inode
,
1023 .write_super
= ext4_write_super
,
1024 .put_super
= ext4_put_super
,
1025 .statfs
= ext4_statfs
,
1026 .remount_fs
= ext4_remount
,
1027 .clear_inode
= ext4_clear_inode
,
1028 .show_options
= ext4_show_options
,
1030 .quota_read
= ext4_quota_read
,
1031 .quota_write
= ext4_quota_write
,
1033 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1036 static const struct export_operations ext4_export_ops
= {
1037 .fh_to_dentry
= ext4_fh_to_dentry
,
1038 .fh_to_parent
= ext4_fh_to_parent
,
1039 .get_parent
= ext4_get_parent
,
1043 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1044 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1045 Opt_nouid32
, Opt_debug
, Opt_oldalloc
, Opt_orlov
,
1046 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1047 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
, Opt_nobh
, Opt_bh
,
1048 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
,
1049 Opt_journal_update
, Opt_journal_dev
,
1050 Opt_journal_checksum
, Opt_journal_async_commit
,
1051 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1052 Opt_data_err_abort
, Opt_data_err_ignore
, Opt_mb_history_length
,
1053 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1054 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_quota
, Opt_noquota
,
1055 Opt_ignore
, Opt_barrier
, Opt_nobarrier
, Opt_err
, Opt_resize
,
1056 Opt_usrquota
, Opt_grpquota
, Opt_i_version
,
1057 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
,
1058 Opt_inode_readahead_blks
, Opt_journal_ioprio
1061 static const match_table_t tokens
= {
1062 {Opt_bsd_df
, "bsddf"},
1063 {Opt_minix_df
, "minixdf"},
1064 {Opt_grpid
, "grpid"},
1065 {Opt_grpid
, "bsdgroups"},
1066 {Opt_nogrpid
, "nogrpid"},
1067 {Opt_nogrpid
, "sysvgroups"},
1068 {Opt_resgid
, "resgid=%u"},
1069 {Opt_resuid
, "resuid=%u"},
1071 {Opt_err_cont
, "errors=continue"},
1072 {Opt_err_panic
, "errors=panic"},
1073 {Opt_err_ro
, "errors=remount-ro"},
1074 {Opt_nouid32
, "nouid32"},
1075 {Opt_debug
, "debug"},
1076 {Opt_oldalloc
, "oldalloc"},
1077 {Opt_orlov
, "orlov"},
1078 {Opt_user_xattr
, "user_xattr"},
1079 {Opt_nouser_xattr
, "nouser_xattr"},
1081 {Opt_noacl
, "noacl"},
1082 {Opt_noload
, "noload"},
1085 {Opt_commit
, "commit=%u"},
1086 {Opt_min_batch_time
, "min_batch_time=%u"},
1087 {Opt_max_batch_time
, "max_batch_time=%u"},
1088 {Opt_journal_update
, "journal=update"},
1089 {Opt_journal_dev
, "journal_dev=%u"},
1090 {Opt_journal_checksum
, "journal_checksum"},
1091 {Opt_journal_async_commit
, "journal_async_commit"},
1092 {Opt_abort
, "abort"},
1093 {Opt_data_journal
, "data=journal"},
1094 {Opt_data_ordered
, "data=ordered"},
1095 {Opt_data_writeback
, "data=writeback"},
1096 {Opt_data_err_abort
, "data_err=abort"},
1097 {Opt_data_err_ignore
, "data_err=ignore"},
1098 {Opt_mb_history_length
, "mb_history_length=%u"},
1099 {Opt_offusrjquota
, "usrjquota="},
1100 {Opt_usrjquota
, "usrjquota=%s"},
1101 {Opt_offgrpjquota
, "grpjquota="},
1102 {Opt_grpjquota
, "grpjquota=%s"},
1103 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1104 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1105 {Opt_grpquota
, "grpquota"},
1106 {Opt_noquota
, "noquota"},
1107 {Opt_quota
, "quota"},
1108 {Opt_usrquota
, "usrquota"},
1109 {Opt_barrier
, "barrier=%u"},
1110 {Opt_barrier
, "barrier"},
1111 {Opt_nobarrier
, "nobarrier"},
1112 {Opt_i_version
, "i_version"},
1113 {Opt_stripe
, "stripe=%u"},
1114 {Opt_resize
, "resize"},
1115 {Opt_delalloc
, "delalloc"},
1116 {Opt_nodelalloc
, "nodelalloc"},
1117 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1118 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1119 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1120 {Opt_auto_da_alloc
, "auto_da_alloc"},
1121 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1125 static ext4_fsblk_t
get_sb_block(void **data
)
1127 ext4_fsblk_t sb_block
;
1128 char *options
= (char *) *data
;
1130 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1131 return 1; /* Default location */
1133 /*todo: use simple_strtoll with >32bit ext4 */
1134 sb_block
= simple_strtoul(options
, &options
, 0);
1135 if (*options
&& *options
!= ',') {
1136 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1140 if (*options
== ',')
1142 *data
= (void *) options
;
1146 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1148 static int parse_options(char *options
, struct super_block
*sb
,
1149 unsigned long *journal_devnum
,
1150 unsigned int *journal_ioprio
,
1151 ext4_fsblk_t
*n_blocks_count
, int is_remount
)
1153 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1155 substring_t args
[MAX_OPT_ARGS
];
1166 while ((p
= strsep(&options
, ",")) != NULL
) {
1171 token
= match_token(p
, tokens
, args
);
1174 clear_opt(sbi
->s_mount_opt
, MINIX_DF
);
1177 set_opt(sbi
->s_mount_opt
, MINIX_DF
);
1180 set_opt(sbi
->s_mount_opt
, GRPID
);
1183 clear_opt(sbi
->s_mount_opt
, GRPID
);
1186 if (match_int(&args
[0], &option
))
1188 sbi
->s_resuid
= option
;
1191 if (match_int(&args
[0], &option
))
1193 sbi
->s_resgid
= option
;
1196 /* handled by get_sb_block() instead of here */
1197 /* *sb_block = match_int(&args[0]); */
1200 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1201 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1202 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1205 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1206 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1207 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1210 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1211 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1212 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1215 set_opt(sbi
->s_mount_opt
, NO_UID32
);
1218 set_opt(sbi
->s_mount_opt
, DEBUG
);
1221 set_opt(sbi
->s_mount_opt
, OLDALLOC
);
1224 clear_opt(sbi
->s_mount_opt
, OLDALLOC
);
1226 #ifdef CONFIG_EXT4_FS_XATTR
1227 case Opt_user_xattr
:
1228 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
1230 case Opt_nouser_xattr
:
1231 clear_opt(sbi
->s_mount_opt
, XATTR_USER
);
1234 case Opt_user_xattr
:
1235 case Opt_nouser_xattr
:
1236 printk(KERN_ERR
"EXT4 (no)user_xattr options "
1240 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1242 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1245 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1250 printk(KERN_ERR
"EXT4 (no)acl options "
1254 case Opt_journal_update
:
1256 /* Eventually we will want to be able to create
1257 a journal file here. For now, only allow the
1258 user to specify an existing inode to be the
1261 printk(KERN_ERR
"EXT4-fs: cannot specify "
1262 "journal on remount\n");
1265 set_opt(sbi
->s_mount_opt
, UPDATE_JOURNAL
);
1267 case Opt_journal_dev
:
1269 printk(KERN_ERR
"EXT4-fs: cannot specify "
1270 "journal on remount\n");
1273 if (match_int(&args
[0], &option
))
1275 *journal_devnum
= option
;
1277 case Opt_journal_checksum
:
1278 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1280 case Opt_journal_async_commit
:
1281 set_opt(sbi
->s_mount_opt
, JOURNAL_ASYNC_COMMIT
);
1282 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1285 set_opt(sbi
->s_mount_opt
, NOLOAD
);
1288 if (match_int(&args
[0], &option
))
1293 option
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1294 sbi
->s_commit_interval
= HZ
* option
;
1296 case Opt_max_batch_time
:
1297 if (match_int(&args
[0], &option
))
1302 option
= EXT4_DEF_MAX_BATCH_TIME
;
1303 sbi
->s_max_batch_time
= option
;
1305 case Opt_min_batch_time
:
1306 if (match_int(&args
[0], &option
))
1310 sbi
->s_min_batch_time
= option
;
1312 case Opt_data_journal
:
1313 data_opt
= EXT4_MOUNT_JOURNAL_DATA
;
1315 case Opt_data_ordered
:
1316 data_opt
= EXT4_MOUNT_ORDERED_DATA
;
1318 case Opt_data_writeback
:
1319 data_opt
= EXT4_MOUNT_WRITEBACK_DATA
;
1322 if ((sbi
->s_mount_opt
& EXT4_MOUNT_DATA_FLAGS
)
1325 "EXT4-fs: cannot change data "
1326 "mode on remount\n");
1330 sbi
->s_mount_opt
&= ~EXT4_MOUNT_DATA_FLAGS
;
1331 sbi
->s_mount_opt
|= data_opt
;
1334 case Opt_data_err_abort
:
1335 set_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1337 case Opt_data_err_ignore
:
1338 clear_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1340 case Opt_mb_history_length
:
1341 if (match_int(&args
[0], &option
))
1345 sbi
->s_mb_history_max
= option
;
1354 if (sb_any_quota_loaded(sb
) &&
1355 !sbi
->s_qf_names
[qtype
]) {
1357 "EXT4-fs: Cannot change journaled "
1358 "quota options when quota turned on.\n");
1361 qname
= match_strdup(&args
[0]);
1364 "EXT4-fs: not enough memory for "
1365 "storing quotafile name.\n");
1368 if (sbi
->s_qf_names
[qtype
] &&
1369 strcmp(sbi
->s_qf_names
[qtype
], qname
)) {
1371 "EXT4-fs: %s quota file already "
1372 "specified.\n", QTYPE2NAME(qtype
));
1376 sbi
->s_qf_names
[qtype
] = qname
;
1377 if (strchr(sbi
->s_qf_names
[qtype
], '/')) {
1379 "EXT4-fs: quotafile must be on "
1380 "filesystem root.\n");
1381 kfree(sbi
->s_qf_names
[qtype
]);
1382 sbi
->s_qf_names
[qtype
] = NULL
;
1385 set_opt(sbi
->s_mount_opt
, QUOTA
);
1387 case Opt_offusrjquota
:
1390 case Opt_offgrpjquota
:
1393 if (sb_any_quota_loaded(sb
) &&
1394 sbi
->s_qf_names
[qtype
]) {
1395 printk(KERN_ERR
"EXT4-fs: Cannot change "
1396 "journaled quota options when "
1397 "quota turned on.\n");
1401 * The space will be released later when all options
1402 * are confirmed to be correct
1404 sbi
->s_qf_names
[qtype
] = NULL
;
1406 case Opt_jqfmt_vfsold
:
1407 qfmt
= QFMT_VFS_OLD
;
1409 case Opt_jqfmt_vfsv0
:
1412 if (sb_any_quota_loaded(sb
) &&
1413 sbi
->s_jquota_fmt
!= qfmt
) {
1414 printk(KERN_ERR
"EXT4-fs: Cannot change "
1415 "journaled quota options when "
1416 "quota turned on.\n");
1419 sbi
->s_jquota_fmt
= qfmt
;
1423 set_opt(sbi
->s_mount_opt
, QUOTA
);
1424 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
1427 set_opt(sbi
->s_mount_opt
, QUOTA
);
1428 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1431 if (sb_any_quota_loaded(sb
)) {
1432 printk(KERN_ERR
"EXT4-fs: Cannot change quota "
1433 "options when quota turned on.\n");
1436 clear_opt(sbi
->s_mount_opt
, QUOTA
);
1437 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1438 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1445 "EXT4-fs: quota options not supported.\n");
1449 case Opt_offusrjquota
:
1450 case Opt_offgrpjquota
:
1451 case Opt_jqfmt_vfsold
:
1452 case Opt_jqfmt_vfsv0
:
1454 "EXT4-fs: journaled quota options not "
1461 set_opt(sbi
->s_mount_opt
, ABORT
);
1464 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1467 if (match_int(&args
[0], &option
)) {
1468 set_opt(sbi
->s_mount_opt
, BARRIER
);
1472 set_opt(sbi
->s_mount_opt
, BARRIER
);
1474 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1480 printk("EXT4-fs: resize option only available "
1484 if (match_int(&args
[0], &option
) != 0)
1486 *n_blocks_count
= option
;
1489 set_opt(sbi
->s_mount_opt
, NOBH
);
1492 clear_opt(sbi
->s_mount_opt
, NOBH
);
1495 set_opt(sbi
->s_mount_opt
, I_VERSION
);
1496 sb
->s_flags
|= MS_I_VERSION
;
1498 case Opt_nodelalloc
:
1499 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
1502 if (match_int(&args
[0], &option
))
1506 sbi
->s_stripe
= option
;
1509 set_opt(sbi
->s_mount_opt
, DELALLOC
);
1511 case Opt_inode_readahead_blks
:
1512 if (match_int(&args
[0], &option
))
1514 if (option
< 0 || option
> (1 << 30))
1516 if (!is_power_of_2(option
)) {
1517 printk(KERN_ERR
"EXT4-fs: inode_readahead_blks"
1518 " must be a power of 2\n");
1521 sbi
->s_inode_readahead_blks
= option
;
1523 case Opt_journal_ioprio
:
1524 if (match_int(&args
[0], &option
))
1526 if (option
< 0 || option
> 7)
1528 *journal_ioprio
= IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
,
1531 case Opt_noauto_da_alloc
:
1532 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1534 case Opt_auto_da_alloc
:
1535 if (match_int(&args
[0], &option
)) {
1536 clear_opt(sbi
->s_mount_opt
, NO_AUTO_DA_ALLOC
);
1540 clear_opt(sbi
->s_mount_opt
, NO_AUTO_DA_ALLOC
);
1542 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1546 "EXT4-fs: Unrecognized mount option \"%s\" "
1547 "or missing value\n", p
);
1552 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1553 if ((sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
) &&
1554 sbi
->s_qf_names
[USRQUOTA
])
1555 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1557 if ((sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
) &&
1558 sbi
->s_qf_names
[GRPQUOTA
])
1559 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1561 if ((sbi
->s_qf_names
[USRQUOTA
] &&
1562 (sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
)) ||
1563 (sbi
->s_qf_names
[GRPQUOTA
] &&
1564 (sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
))) {
1565 printk(KERN_ERR
"EXT4-fs: old and new quota "
1566 "format mixing.\n");
1570 if (!sbi
->s_jquota_fmt
) {
1571 printk(KERN_ERR
"EXT4-fs: journaled quota format "
1572 "not specified.\n");
1576 if (sbi
->s_jquota_fmt
) {
1577 printk(KERN_ERR
"EXT4-fs: journaled quota format "
1578 "specified with no journaling "
1587 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1590 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1593 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1594 printk(KERN_ERR
"EXT4-fs warning: revision level too high, "
1595 "forcing read-only mode\n");
1600 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1601 printk(KERN_WARNING
"EXT4-fs warning: mounting unchecked fs, "
1602 "running e2fsck is recommended\n");
1603 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1605 "EXT4-fs warning: mounting fs with errors, "
1606 "running e2fsck is recommended\n");
1607 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
1608 le16_to_cpu(es
->s_mnt_count
) >=
1609 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1611 "EXT4-fs warning: maximal mount count reached, "
1612 "running e2fsck is recommended\n");
1613 else if (le32_to_cpu(es
->s_checkinterval
) &&
1614 (le32_to_cpu(es
->s_lastcheck
) +
1615 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1617 "EXT4-fs warning: checktime reached, "
1618 "running e2fsck is recommended\n");
1619 if (!sbi
->s_journal
)
1620 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1621 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1622 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1623 le16_add_cpu(&es
->s_mnt_count
, 1);
1624 es
->s_mtime
= cpu_to_le32(get_seconds());
1625 ext4_update_dynamic_rev(sb
);
1627 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1629 ext4_commit_super(sb
, 1);
1630 if (test_opt(sb
, DEBUG
))
1631 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
1632 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1634 sbi
->s_groups_count
,
1635 EXT4_BLOCKS_PER_GROUP(sb
),
1636 EXT4_INODES_PER_GROUP(sb
),
1639 if (EXT4_SB(sb
)->s_journal
) {
1640 printk(KERN_INFO
"EXT4 FS on %s, %s journal on %s\n",
1641 sb
->s_id
, EXT4_SB(sb
)->s_journal
->j_inode
? "internal" :
1642 "external", EXT4_SB(sb
)->s_journal
->j_devname
);
1644 printk(KERN_INFO
"EXT4 FS on %s, no journal\n", sb
->s_id
);
1649 static int ext4_fill_flex_info(struct super_block
*sb
)
1651 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1652 struct ext4_group_desc
*gdp
= NULL
;
1653 struct buffer_head
*bh
;
1654 ext4_group_t flex_group_count
;
1655 ext4_group_t flex_group
;
1656 int groups_per_flex
= 0;
1660 if (!sbi
->s_es
->s_log_groups_per_flex
) {
1661 sbi
->s_log_groups_per_flex
= 0;
1665 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1666 groups_per_flex
= 1 << sbi
->s_log_groups_per_flex
;
1668 /* We allocate both existing and potentially added groups */
1669 flex_group_count
= ((sbi
->s_groups_count
+ groups_per_flex
- 1) +
1670 ((le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
) + 1) <<
1671 EXT4_DESC_PER_BLOCK_BITS(sb
))) / groups_per_flex
;
1672 size
= flex_group_count
* sizeof(struct flex_groups
);
1673 sbi
->s_flex_groups
= kzalloc(size
, GFP_KERNEL
);
1674 if (sbi
->s_flex_groups
== NULL
) {
1675 sbi
->s_flex_groups
= vmalloc(size
);
1676 if (sbi
->s_flex_groups
)
1677 memset(sbi
->s_flex_groups
, 0, size
);
1679 if (sbi
->s_flex_groups
== NULL
) {
1680 printk(KERN_ERR
"EXT4-fs: not enough memory for "
1681 "%u flex groups\n", flex_group_count
);
1685 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1686 gdp
= ext4_get_group_desc(sb
, i
, &bh
);
1688 flex_group
= ext4_flex_group(sbi
, i
);
1689 atomic_set(&sbi
->s_flex_groups
[flex_group
].free_inodes
,
1690 ext4_free_inodes_count(sb
, gdp
));
1691 atomic_set(&sbi
->s_flex_groups
[flex_group
].free_blocks
,
1692 ext4_free_blks_count(sb
, gdp
));
1693 atomic_set(&sbi
->s_flex_groups
[flex_group
].used_dirs
,
1694 ext4_used_dirs_count(sb
, gdp
));
1702 __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
1703 struct ext4_group_desc
*gdp
)
1707 if (sbi
->s_es
->s_feature_ro_compat
&
1708 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) {
1709 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
1710 __le32 le_group
= cpu_to_le32(block_group
);
1712 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
1713 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
1714 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
1715 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
1716 /* for checksum of struct ext4_group_desc do the rest...*/
1717 if ((sbi
->s_es
->s_feature_incompat
&
1718 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
1719 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
1720 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
1721 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
1725 return cpu_to_le16(crc
);
1728 int ext4_group_desc_csum_verify(struct ext4_sb_info
*sbi
, __u32 block_group
,
1729 struct ext4_group_desc
*gdp
)
1731 if ((sbi
->s_es
->s_feature_ro_compat
&
1732 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) &&
1733 (gdp
->bg_checksum
!= ext4_group_desc_csum(sbi
, block_group
, gdp
)))
1739 /* Called at mount-time, super-block is locked */
1740 static int ext4_check_descriptors(struct super_block
*sb
)
1742 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1743 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
1744 ext4_fsblk_t last_block
;
1745 ext4_fsblk_t block_bitmap
;
1746 ext4_fsblk_t inode_bitmap
;
1747 ext4_fsblk_t inode_table
;
1748 int flexbg_flag
= 0;
1751 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
1754 ext4_debug("Checking group descriptors");
1756 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1757 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1759 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
1760 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
1762 last_block
= first_block
+
1763 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
1765 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
1766 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
1767 printk(KERN_ERR
"EXT4-fs: ext4_check_descriptors: "
1768 "Block bitmap for group %u not in group "
1769 "(block %llu)!\n", i
, block_bitmap
);
1772 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
1773 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
1774 printk(KERN_ERR
"EXT4-fs: ext4_check_descriptors: "
1775 "Inode bitmap for group %u not in group "
1776 "(block %llu)!\n", i
, inode_bitmap
);
1779 inode_table
= ext4_inode_table(sb
, gdp
);
1780 if (inode_table
< first_block
||
1781 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
1782 printk(KERN_ERR
"EXT4-fs: ext4_check_descriptors: "
1783 "Inode table for group %u not in group "
1784 "(block %llu)!\n", i
, inode_table
);
1787 ext4_lock_group(sb
, i
);
1788 if (!ext4_group_desc_csum_verify(sbi
, i
, gdp
)) {
1789 printk(KERN_ERR
"EXT4-fs: ext4_check_descriptors: "
1790 "Checksum for group %u failed (%u!=%u)\n",
1791 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
1792 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
1793 if (!(sb
->s_flags
& MS_RDONLY
)) {
1794 ext4_unlock_group(sb
, i
);
1798 ext4_unlock_group(sb
, i
);
1800 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
1803 ext4_free_blocks_count_set(sbi
->s_es
, ext4_count_free_blocks(sb
));
1804 sbi
->s_es
->s_free_inodes_count
= cpu_to_le32(ext4_count_free_inodes(sb
));
1808 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1809 * the superblock) which were deleted from all directories, but held open by
1810 * a process at the time of a crash. We walk the list and try to delete these
1811 * inodes at recovery time (only with a read-write filesystem).
1813 * In order to keep the orphan inode chain consistent during traversal (in
1814 * case of crash during recovery), we link each inode into the superblock
1815 * orphan list_head and handle it the same way as an inode deletion during
1816 * normal operation (which journals the operations for us).
1818 * We only do an iget() and an iput() on each inode, which is very safe if we
1819 * accidentally point at an in-use or already deleted inode. The worst that
1820 * can happen in this case is that we get a "bit already cleared" message from
1821 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1822 * e2fsck was run on this filesystem, and it must have already done the orphan
1823 * inode cleanup for us, so we can safely abort without any further action.
1825 static void ext4_orphan_cleanup(struct super_block
*sb
,
1826 struct ext4_super_block
*es
)
1828 unsigned int s_flags
= sb
->s_flags
;
1829 int nr_orphans
= 0, nr_truncates
= 0;
1833 if (!es
->s_last_orphan
) {
1834 jbd_debug(4, "no orphan inodes to clean up\n");
1838 if (bdev_read_only(sb
->s_bdev
)) {
1839 printk(KERN_ERR
"EXT4-fs: write access "
1840 "unavailable, skipping orphan cleanup.\n");
1844 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
1845 if (es
->s_last_orphan
)
1846 jbd_debug(1, "Errors on filesystem, "
1847 "clearing orphan list.\n");
1848 es
->s_last_orphan
= 0;
1849 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1853 if (s_flags
& MS_RDONLY
) {
1854 printk(KERN_INFO
"EXT4-fs: %s: orphan cleanup on readonly fs\n",
1856 sb
->s_flags
&= ~MS_RDONLY
;
1859 /* Needed for iput() to work correctly and not trash data */
1860 sb
->s_flags
|= MS_ACTIVE
;
1861 /* Turn on quotas so that they are updated correctly */
1862 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1863 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
1864 int ret
= ext4_quota_on_mount(sb
, i
);
1867 "EXT4-fs: Cannot turn on journaled "
1868 "quota: error %d\n", ret
);
1873 while (es
->s_last_orphan
) {
1874 struct inode
*inode
;
1876 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
1877 if (IS_ERR(inode
)) {
1878 es
->s_last_orphan
= 0;
1882 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
1884 if (inode
->i_nlink
) {
1886 "%s: truncating inode %lu to %lld bytes\n",
1887 __func__
, inode
->i_ino
, inode
->i_size
);
1888 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
1889 inode
->i_ino
, inode
->i_size
);
1890 ext4_truncate(inode
);
1894 "%s: deleting unreferenced inode %lu\n",
1895 __func__
, inode
->i_ino
);
1896 jbd_debug(2, "deleting unreferenced inode %lu\n",
1900 iput(inode
); /* The delete magic happens here! */
1903 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
1906 printk(KERN_INFO
"EXT4-fs: %s: %d orphan inode%s deleted\n",
1907 sb
->s_id
, PLURAL(nr_orphans
));
1909 printk(KERN_INFO
"EXT4-fs: %s: %d truncate%s cleaned up\n",
1910 sb
->s_id
, PLURAL(nr_truncates
));
1912 /* Turn quotas off */
1913 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1914 if (sb_dqopt(sb
)->files
[i
])
1915 vfs_quota_off(sb
, i
, 0);
1918 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
1921 * Maximal extent format file size.
1922 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1923 * extent format containers, within a sector_t, and within i_blocks
1924 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1925 * so that won't be a limiting factor.
1927 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1929 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
1932 loff_t upper_limit
= MAX_LFS_FILESIZE
;
1934 /* small i_blocks in vfs inode? */
1935 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
1937 * CONFIG_LBD is not enabled implies the inode
1938 * i_block represent total blocks in 512 bytes
1939 * 32 == size of vfs inode i_blocks * 8
1941 upper_limit
= (1LL << 32) - 1;
1943 /* total blocks in file system block size */
1944 upper_limit
>>= (blkbits
- 9);
1945 upper_limit
<<= blkbits
;
1948 /* 32-bit extent-start container, ee_block */
1953 /* Sanity check against vm- & vfs- imposed limits */
1954 if (res
> upper_limit
)
1961 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
1962 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1963 * We need to be 1 filesystem block less than the 2^48 sector limit.
1965 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
1967 loff_t res
= EXT4_NDIR_BLOCKS
;
1970 /* This is calculated to be the largest file size for a
1971 * dense, bitmapped file such that the total number of
1972 * sectors in the file, including data and all indirect blocks,
1973 * does not exceed 2^48 -1
1974 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1975 * total number of 512 bytes blocks of the file
1978 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
1980 * !has_huge_files or CONFIG_LBD is not enabled
1981 * implies the inode i_block represent total blocks in
1982 * 512 bytes 32 == size of vfs inode i_blocks * 8
1984 upper_limit
= (1LL << 32) - 1;
1986 /* total blocks in file system block size */
1987 upper_limit
>>= (bits
- 9);
1991 * We use 48 bit ext4_inode i_blocks
1992 * With EXT4_HUGE_FILE_FL set the i_blocks
1993 * represent total number of blocks in
1994 * file system block size
1996 upper_limit
= (1LL << 48) - 1;
2000 /* indirect blocks */
2002 /* double indirect blocks */
2003 meta_blocks
+= 1 + (1LL << (bits
-2));
2004 /* tripple indirect blocks */
2005 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2007 upper_limit
-= meta_blocks
;
2008 upper_limit
<<= bits
;
2010 res
+= 1LL << (bits
-2);
2011 res
+= 1LL << (2*(bits
-2));
2012 res
+= 1LL << (3*(bits
-2));
2014 if (res
> upper_limit
)
2017 if (res
> MAX_LFS_FILESIZE
)
2018 res
= MAX_LFS_FILESIZE
;
2023 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2024 ext4_fsblk_t logical_sb_block
, int nr
)
2026 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2027 ext4_group_t bg
, first_meta_bg
;
2030 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2032 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
2034 return logical_sb_block
+ nr
+ 1;
2035 bg
= sbi
->s_desc_per_block
* nr
;
2036 if (ext4_bg_has_super(sb
, bg
))
2038 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2042 * ext4_get_stripe_size: Get the stripe size.
2043 * @sbi: In memory super block info
2045 * If we have specified it via mount option, then
2046 * use the mount option value. If the value specified at mount time is
2047 * greater than the blocks per group use the super block value.
2048 * If the super block value is greater than blocks per group return 0.
2049 * Allocator needs it be less than blocks per group.
2052 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2054 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2055 unsigned long stripe_width
=
2056 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2058 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2059 return sbi
->s_stripe
;
2061 if (stripe_width
<= sbi
->s_blocks_per_group
)
2062 return stripe_width
;
2064 if (stride
<= sbi
->s_blocks_per_group
)
2073 struct attribute attr
;
2074 ssize_t (*show
)(struct ext4_attr
*, struct ext4_sb_info
*, char *);
2075 ssize_t (*store
)(struct ext4_attr
*, struct ext4_sb_info
*,
2076 const char *, size_t);
2080 static int parse_strtoul(const char *buf
,
2081 unsigned long max
, unsigned long *value
)
2085 while (*buf
&& isspace(*buf
))
2087 *value
= simple_strtoul(buf
, &endp
, 0);
2088 while (*endp
&& isspace(*endp
))
2090 if (*endp
|| *value
> max
)
2096 static ssize_t
delayed_allocation_blocks_show(struct ext4_attr
*a
,
2097 struct ext4_sb_info
*sbi
,
2100 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2101 (s64
) percpu_counter_sum(&sbi
->s_dirtyblocks_counter
));
2104 static ssize_t
session_write_kbytes_show(struct ext4_attr
*a
,
2105 struct ext4_sb_info
*sbi
, char *buf
)
2107 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2109 return snprintf(buf
, PAGE_SIZE
, "%lu\n",
2110 (part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2111 sbi
->s_sectors_written_start
) >> 1);
2114 static ssize_t
lifetime_write_kbytes_show(struct ext4_attr
*a
,
2115 struct ext4_sb_info
*sbi
, char *buf
)
2117 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2119 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2120 sbi
->s_kbytes_written
+
2121 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2122 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
2125 static ssize_t
inode_readahead_blks_store(struct ext4_attr
*a
,
2126 struct ext4_sb_info
*sbi
,
2127 const char *buf
, size_t count
)
2131 if (parse_strtoul(buf
, 0x40000000, &t
))
2134 if (!is_power_of_2(t
))
2137 sbi
->s_inode_readahead_blks
= t
;
2141 static ssize_t
sbi_ui_show(struct ext4_attr
*a
,
2142 struct ext4_sb_info
*sbi
, char *buf
)
2144 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2146 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
2149 static ssize_t
sbi_ui_store(struct ext4_attr
*a
,
2150 struct ext4_sb_info
*sbi
,
2151 const char *buf
, size_t count
)
2153 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2156 if (parse_strtoul(buf
, 0xffffffff, &t
))
2162 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2163 static struct ext4_attr ext4_attr_##_name = { \
2164 .attr = {.name = __stringify(_name), .mode = _mode }, \
2167 .offset = offsetof(struct ext4_sb_info, _elname), \
2169 #define EXT4_ATTR(name, mode, show, store) \
2170 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2172 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2173 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2174 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2175 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2176 #define ATTR_LIST(name) &ext4_attr_##name.attr
2178 EXT4_RO_ATTR(delayed_allocation_blocks
);
2179 EXT4_RO_ATTR(session_write_kbytes
);
2180 EXT4_RO_ATTR(lifetime_write_kbytes
);
2181 EXT4_ATTR_OFFSET(inode_readahead_blks
, 0644, sbi_ui_show
,
2182 inode_readahead_blks_store
, s_inode_readahead_blks
);
2183 EXT4_RW_ATTR_SBI_UI(mb_stats
, s_mb_stats
);
2184 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan
, s_mb_max_to_scan
);
2185 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan
, s_mb_min_to_scan
);
2186 EXT4_RW_ATTR_SBI_UI(mb_order2_req
, s_mb_order2_reqs
);
2187 EXT4_RW_ATTR_SBI_UI(mb_stream_req
, s_mb_stream_request
);
2188 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc
, s_mb_group_prealloc
);
2190 static struct attribute
*ext4_attrs
[] = {
2191 ATTR_LIST(delayed_allocation_blocks
),
2192 ATTR_LIST(session_write_kbytes
),
2193 ATTR_LIST(lifetime_write_kbytes
),
2194 ATTR_LIST(inode_readahead_blks
),
2195 ATTR_LIST(mb_stats
),
2196 ATTR_LIST(mb_max_to_scan
),
2197 ATTR_LIST(mb_min_to_scan
),
2198 ATTR_LIST(mb_order2_req
),
2199 ATTR_LIST(mb_stream_req
),
2200 ATTR_LIST(mb_group_prealloc
),
2204 static ssize_t
ext4_attr_show(struct kobject
*kobj
,
2205 struct attribute
*attr
, char *buf
)
2207 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2209 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2211 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
2214 static ssize_t
ext4_attr_store(struct kobject
*kobj
,
2215 struct attribute
*attr
,
2216 const char *buf
, size_t len
)
2218 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2220 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2222 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
2225 static void ext4_sb_release(struct kobject
*kobj
)
2227 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2229 complete(&sbi
->s_kobj_unregister
);
2233 static struct sysfs_ops ext4_attr_ops
= {
2234 .show
= ext4_attr_show
,
2235 .store
= ext4_attr_store
,
2238 static struct kobj_type ext4_ktype
= {
2239 .default_attrs
= ext4_attrs
,
2240 .sysfs_ops
= &ext4_attr_ops
,
2241 .release
= ext4_sb_release
,
2244 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
2245 __releases(kernel_lock
)
2246 __acquires(kernel_lock
)
2249 struct buffer_head
*bh
;
2250 struct ext4_super_block
*es
= NULL
;
2251 struct ext4_sb_info
*sbi
;
2253 ext4_fsblk_t sb_block
= get_sb_block(&data
);
2254 ext4_fsblk_t logical_sb_block
;
2255 unsigned long offset
= 0;
2256 unsigned long journal_devnum
= 0;
2257 unsigned long def_mount_opts
;
2263 unsigned int db_count
;
2265 int needs_recovery
, has_huge_files
;
2269 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
2271 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
2275 sbi
->s_blockgroup_lock
=
2276 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
2277 if (!sbi
->s_blockgroup_lock
) {
2281 sb
->s_fs_info
= sbi
;
2282 sbi
->s_mount_opt
= 0;
2283 sbi
->s_resuid
= EXT4_DEF_RESUID
;
2284 sbi
->s_resgid
= EXT4_DEF_RESGID
;
2285 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
2286 sbi
->s_sb_block
= sb_block
;
2287 sbi
->s_sectors_written_start
= part_stat_read(sb
->s_bdev
->bd_part
,
2292 /* Cleanup superblock name */
2293 for (cp
= sb
->s_id
; (cp
= strchr(cp
, '/'));)
2296 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
2298 printk(KERN_ERR
"EXT4-fs: unable to set blocksize\n");
2303 * The ext4 superblock will not be buffer aligned for other than 1kB
2304 * block sizes. We need to calculate the offset from buffer start.
2306 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
2307 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2308 offset
= do_div(logical_sb_block
, blocksize
);
2310 logical_sb_block
= sb_block
;
2313 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
2314 printk(KERN_ERR
"EXT4-fs: unable to read superblock\n");
2318 * Note: s_es must be initialized as soon as possible because
2319 * some ext4 macro-instructions depend on its value
2321 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
2323 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
2324 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
2326 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
2328 /* Set defaults before we parse the mount options */
2329 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
2330 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
2331 set_opt(sbi
->s_mount_opt
, DEBUG
);
2332 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
2333 set_opt(sbi
->s_mount_opt
, GRPID
);
2334 if (def_mount_opts
& EXT4_DEFM_UID16
)
2335 set_opt(sbi
->s_mount_opt
, NO_UID32
);
2336 #ifdef CONFIG_EXT4_FS_XATTR
2337 if (def_mount_opts
& EXT4_DEFM_XATTR_USER
)
2338 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
2340 #ifdef CONFIG_EXT4_FS_POSIX_ACL
2341 if (def_mount_opts
& EXT4_DEFM_ACL
)
2342 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
2344 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
2345 sbi
->s_mount_opt
|= EXT4_MOUNT_JOURNAL_DATA
;
2346 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
2347 sbi
->s_mount_opt
|= EXT4_MOUNT_ORDERED_DATA
;
2348 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
2349 sbi
->s_mount_opt
|= EXT4_MOUNT_WRITEBACK_DATA
;
2351 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
2352 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
2353 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
2354 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
2356 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
2358 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
2359 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
2360 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
2361 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
2362 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
2363 sbi
->s_mb_history_max
= default_mb_history_length
;
2365 set_opt(sbi
->s_mount_opt
, BARRIER
);
2368 * enable delayed allocation by default
2369 * Use -o nodelalloc to turn it off
2371 set_opt(sbi
->s_mount_opt
, DELALLOC
);
2374 if (!parse_options((char *) data
, sb
, &journal_devnum
,
2375 &journal_ioprio
, NULL
, 0))
2378 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
2379 ((sbi
->s_mount_opt
& EXT4_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
2381 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
2382 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
2383 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
2384 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
2386 "EXT4-fs warning: feature flags set on rev 0 fs, "
2387 "running e2fsck is recommended\n");
2390 * Check feature flags regardless of the revision level, since we
2391 * previously didn't change the revision level when setting the flags,
2392 * so there is a chance incompat flags are set on a rev 0 filesystem.
2394 features
= EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
);
2396 printk(KERN_ERR
"EXT4-fs: %s: couldn't mount because of "
2397 "unsupported optional features (%x).\n", sb
->s_id
,
2398 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2399 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2402 features
= EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
);
2403 if (!(sb
->s_flags
& MS_RDONLY
) && features
) {
2404 printk(KERN_ERR
"EXT4-fs: %s: couldn't mount RDWR because of "
2405 "unsupported optional features (%x).\n", sb
->s_id
,
2406 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2407 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2410 has_huge_files
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2411 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
);
2412 if (has_huge_files
) {
2414 * Large file size enabled file system can only be
2415 * mount if kernel is build with CONFIG_LBD
2417 if (sizeof(root
->i_blocks
) < sizeof(u64
) &&
2418 !(sb
->s_flags
& MS_RDONLY
)) {
2419 printk(KERN_ERR
"EXT4-fs: %s: Filesystem with huge "
2420 "files cannot be mounted read-write "
2421 "without CONFIG_LBD.\n", sb
->s_id
);
2425 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
2427 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
2428 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
2430 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
2431 blocksize
, sb
->s_id
);
2435 if (sb
->s_blocksize
!= blocksize
) {
2437 /* Validate the filesystem blocksize */
2438 if (!sb_set_blocksize(sb
, blocksize
)) {
2439 printk(KERN_ERR
"EXT4-fs: bad block size %d.\n",
2445 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2446 offset
= do_div(logical_sb_block
, blocksize
);
2447 bh
= sb_bread(sb
, logical_sb_block
);
2450 "EXT4-fs: Can't read superblock on 2nd try.\n");
2453 es
= (struct ext4_super_block
*)(((char *)bh
->b_data
) + offset
);
2455 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
2457 "EXT4-fs: Magic mismatch, very weird !\n");
2462 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
2464 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
2466 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
2467 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
2468 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
2470 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
2471 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
2472 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
2473 (!is_power_of_2(sbi
->s_inode_size
)) ||
2474 (sbi
->s_inode_size
> blocksize
)) {
2476 "EXT4-fs: unsupported inode size: %d\n",
2480 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
2481 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
2483 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
2484 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
2485 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
2486 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
2487 !is_power_of_2(sbi
->s_desc_size
)) {
2489 "EXT4-fs: unsupported descriptor size %lu\n",
2494 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
2495 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
2496 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
2497 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
2499 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
2500 if (sbi
->s_inodes_per_block
== 0)
2502 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
2503 sbi
->s_inodes_per_block
;
2504 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
2506 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
2507 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
2508 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
2509 for (i
= 0; i
< 4; i
++)
2510 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
2511 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
2512 i
= le32_to_cpu(es
->s_flags
);
2513 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
2514 sbi
->s_hash_unsigned
= 3;
2515 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
2516 #ifdef __CHAR_UNSIGNED__
2517 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
2518 sbi
->s_hash_unsigned
= 3;
2520 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
2525 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
2527 "EXT4-fs: #blocks per group too big: %lu\n",
2528 sbi
->s_blocks_per_group
);
2531 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
2533 "EXT4-fs: #inodes per group too big: %lu\n",
2534 sbi
->s_inodes_per_group
);
2538 if (ext4_blocks_count(es
) >
2539 (sector_t
)(~0ULL) >> (sb
->s_blocksize_bits
- 9)) {
2540 printk(KERN_ERR
"EXT4-fs: filesystem on %s:"
2541 " too large to mount safely\n", sb
->s_id
);
2542 if (sizeof(sector_t
) < 8)
2543 printk(KERN_WARNING
"EXT4-fs: CONFIG_LBD not "
2548 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
2551 /* check blocks count against device size */
2552 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
2553 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
2554 printk(KERN_WARNING
"EXT4-fs: bad geometry: block count %llu "
2555 "exceeds size of device (%llu blocks)\n",
2556 ext4_blocks_count(es
), blocks_count
);
2561 * It makes no sense for the first data block to be beyond the end
2562 * of the filesystem.
2564 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
2565 printk(KERN_WARNING
"EXT4-fs: bad geometry: first data"
2566 "block %u is beyond end of filesystem (%llu)\n",
2567 le32_to_cpu(es
->s_first_data_block
),
2568 ext4_blocks_count(es
));
2571 blocks_count
= (ext4_blocks_count(es
) -
2572 le32_to_cpu(es
->s_first_data_block
) +
2573 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2574 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
2575 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
2576 printk(KERN_WARNING
"EXT4-fs: groups count too large: %u "
2577 "(block count %llu, first data block %u, "
2578 "blocks per group %lu)\n", sbi
->s_groups_count
,
2579 ext4_blocks_count(es
),
2580 le32_to_cpu(es
->s_first_data_block
),
2581 EXT4_BLOCKS_PER_GROUP(sb
));
2584 sbi
->s_groups_count
= blocks_count
;
2585 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
2586 EXT4_DESC_PER_BLOCK(sb
);
2587 sbi
->s_group_desc
= kmalloc(db_count
* sizeof(struct buffer_head
*),
2589 if (sbi
->s_group_desc
== NULL
) {
2590 printk(KERN_ERR
"EXT4-fs: not enough memory\n");
2594 #ifdef CONFIG_PROC_FS
2596 sbi
->s_proc
= proc_mkdir(sb
->s_id
, ext4_proc_root
);
2599 bgl_lock_init(sbi
->s_blockgroup_lock
);
2601 for (i
= 0; i
< db_count
; i
++) {
2602 block
= descriptor_loc(sb
, logical_sb_block
, i
);
2603 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
2604 if (!sbi
->s_group_desc
[i
]) {
2605 printk(KERN_ERR
"EXT4-fs: "
2606 "can't read group descriptor %d\n", i
);
2611 if (!ext4_check_descriptors(sb
)) {
2612 printk(KERN_ERR
"EXT4-fs: group descriptors corrupted!\n");
2615 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
2616 if (!ext4_fill_flex_info(sb
)) {
2618 "EXT4-fs: unable to initialize "
2619 "flex_bg meta info!\n");
2623 sbi
->s_gdb_count
= db_count
;
2624 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
2625 spin_lock_init(&sbi
->s_next_gen_lock
);
2627 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
2628 ext4_count_free_blocks(sb
));
2630 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
2631 ext4_count_free_inodes(sb
));
2634 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
2635 ext4_count_dirs(sb
));
2638 err
= percpu_counter_init(&sbi
->s_dirtyblocks_counter
, 0);
2641 printk(KERN_ERR
"EXT4-fs: insufficient memory\n");
2645 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
2648 * set up enough so that it can read an inode
2650 if (!test_opt(sb
, NOLOAD
) &&
2651 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
2652 sb
->s_op
= &ext4_sops
;
2654 sb
->s_op
= &ext4_nojournal_sops
;
2655 sb
->s_export_op
= &ext4_export_ops
;
2656 sb
->s_xattr
= ext4_xattr_handlers
;
2658 sb
->s_qcop
= &ext4_qctl_operations
;
2659 sb
->dq_op
= &ext4_quota_operations
;
2661 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
2662 mutex_init(&sbi
->s_orphan_lock
);
2663 mutex_init(&sbi
->s_resize_lock
);
2667 needs_recovery
= (es
->s_last_orphan
!= 0 ||
2668 EXT4_HAS_INCOMPAT_FEATURE(sb
,
2669 EXT4_FEATURE_INCOMPAT_RECOVER
));
2672 * The first inode we look at is the journal inode. Don't try
2673 * root first: it may be modified in the journal!
2675 if (!test_opt(sb
, NOLOAD
) &&
2676 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
2677 if (ext4_load_journal(sb
, es
, journal_devnum
))
2679 if (!(sb
->s_flags
& MS_RDONLY
) &&
2680 EXT4_SB(sb
)->s_journal
->j_failed_commit
) {
2681 printk(KERN_CRIT
"EXT4-fs error (device %s): "
2682 "ext4_fill_super: Journal transaction "
2683 "%u is corrupt\n", sb
->s_id
,
2684 EXT4_SB(sb
)->s_journal
->j_failed_commit
);
2685 if (test_opt(sb
, ERRORS_RO
)) {
2687 "Mounting filesystem read-only\n");
2688 sb
->s_flags
|= MS_RDONLY
;
2689 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
2690 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
2692 if (test_opt(sb
, ERRORS_PANIC
)) {
2693 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
2694 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
2695 ext4_commit_super(sb
, 1);
2699 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
2700 EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
2701 printk(KERN_ERR
"EXT4-fs: required journal recovery "
2702 "suppressed and not mounted read-only\n");
2705 clear_opt(sbi
->s_mount_opt
, DATA_FLAGS
);
2706 set_opt(sbi
->s_mount_opt
, WRITEBACK_DATA
);
2707 sbi
->s_journal
= NULL
;
2712 if (ext4_blocks_count(es
) > 0xffffffffULL
&&
2713 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
2714 JBD2_FEATURE_INCOMPAT_64BIT
)) {
2715 printk(KERN_ERR
"EXT4-fs: Failed to set 64-bit journal feature\n");
2719 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
2720 jbd2_journal_set_features(sbi
->s_journal
,
2721 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2722 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2723 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
2724 jbd2_journal_set_features(sbi
->s_journal
,
2725 JBD2_FEATURE_COMPAT_CHECKSUM
, 0, 0);
2726 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
2727 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2729 jbd2_journal_clear_features(sbi
->s_journal
,
2730 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2731 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2734 /* We have now updated the journal if required, so we can
2735 * validate the data journaling mode. */
2736 switch (test_opt(sb
, DATA_FLAGS
)) {
2738 /* No mode set, assume a default based on the journal
2739 * capabilities: ORDERED_DATA if the journal can
2740 * cope, else JOURNAL_DATA
2742 if (jbd2_journal_check_available_features
2743 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
2744 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
2746 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
2749 case EXT4_MOUNT_ORDERED_DATA
:
2750 case EXT4_MOUNT_WRITEBACK_DATA
:
2751 if (!jbd2_journal_check_available_features
2752 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
2753 printk(KERN_ERR
"EXT4-fs: Journal does not support "
2754 "requested data journaling mode\n");
2760 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
2764 if (test_opt(sb
, NOBH
)) {
2765 if (!(test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)) {
2766 printk(KERN_WARNING
"EXT4-fs: Ignoring nobh option - "
2767 "its supported only with writeback mode\n");
2768 clear_opt(sbi
->s_mount_opt
, NOBH
);
2772 * The jbd2_journal_load will have done any necessary log recovery,
2773 * so we can safely mount the rest of the filesystem now.
2776 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
2778 printk(KERN_ERR
"EXT4-fs: get root inode failed\n");
2779 ret
= PTR_ERR(root
);
2782 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
2784 printk(KERN_ERR
"EXT4-fs: corrupt root inode, run e2fsck\n");
2787 sb
->s_root
= d_alloc_root(root
);
2789 printk(KERN_ERR
"EXT4-fs: get root dentry failed\n");
2795 ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
);
2797 /* determine the minimum size of new large inodes, if present */
2798 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
2799 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2800 EXT4_GOOD_OLD_INODE_SIZE
;
2801 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2802 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
2803 if (sbi
->s_want_extra_isize
<
2804 le16_to_cpu(es
->s_want_extra_isize
))
2805 sbi
->s_want_extra_isize
=
2806 le16_to_cpu(es
->s_want_extra_isize
);
2807 if (sbi
->s_want_extra_isize
<
2808 le16_to_cpu(es
->s_min_extra_isize
))
2809 sbi
->s_want_extra_isize
=
2810 le16_to_cpu(es
->s_min_extra_isize
);
2813 /* Check if enough inode space is available */
2814 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
2815 sbi
->s_inode_size
) {
2816 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2817 EXT4_GOOD_OLD_INODE_SIZE
;
2818 printk(KERN_INFO
"EXT4-fs: required extra inode space not"
2822 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
2823 printk(KERN_WARNING
"EXT4-fs: Ignoring delalloc option - "
2824 "requested data journaling mode\n");
2825 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
2826 } else if (test_opt(sb
, DELALLOC
))
2827 printk(KERN_INFO
"EXT4-fs: delayed allocation enabled\n");
2830 err
= ext4_mb_init(sb
, needs_recovery
);
2832 printk(KERN_ERR
"EXT4-fs: failed to initalize mballoc (%d)\n",
2837 sbi
->s_kobj
.kset
= ext4_kset
;
2838 init_completion(&sbi
->s_kobj_unregister
);
2839 err
= kobject_init_and_add(&sbi
->s_kobj
, &ext4_ktype
, NULL
,
2842 ext4_mb_release(sb
);
2843 ext4_ext_release(sb
);
2847 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
2848 ext4_orphan_cleanup(sb
, es
);
2849 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
2850 if (needs_recovery
) {
2851 printk(KERN_INFO
"EXT4-fs: recovery complete.\n");
2852 ext4_mark_recovery_complete(sb
, es
);
2854 if (EXT4_SB(sb
)->s_journal
) {
2855 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
2856 descr
= " journalled data mode";
2857 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
2858 descr
= " ordered data mode";
2860 descr
= " writeback data mode";
2862 descr
= "out journal";
2864 printk(KERN_INFO
"EXT4-fs: mounted filesystem %s with%s\n",
2872 printk(KERN_ERR
"VFS: Can't find ext4 filesystem on dev %s.\n",
2877 printk(KERN_ERR
"EXT4-fs (device %s): mount failed\n", sb
->s_id
);
2878 if (sbi
->s_journal
) {
2879 jbd2_journal_destroy(sbi
->s_journal
);
2880 sbi
->s_journal
= NULL
;
2883 if (sbi
->s_flex_groups
) {
2884 if (is_vmalloc_addr(sbi
->s_flex_groups
))
2885 vfree(sbi
->s_flex_groups
);
2887 kfree(sbi
->s_flex_groups
);
2889 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
2890 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
2891 percpu_counter_destroy(&sbi
->s_dirs_counter
);
2892 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
2894 for (i
= 0; i
< db_count
; i
++)
2895 brelse(sbi
->s_group_desc
[i
]);
2896 kfree(sbi
->s_group_desc
);
2899 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
2902 for (i
= 0; i
< MAXQUOTAS
; i
++)
2903 kfree(sbi
->s_qf_names
[i
]);
2905 ext4_blkdev_remove(sbi
);
2908 sb
->s_fs_info
= NULL
;
2915 * Setup any per-fs journal parameters now. We'll do this both on
2916 * initial mount, once the journal has been initialised but before we've
2917 * done any recovery; and again on any subsequent remount.
2919 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
2921 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2923 journal
->j_commit_interval
= sbi
->s_commit_interval
;
2924 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
2925 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
2927 spin_lock(&journal
->j_state_lock
);
2928 if (test_opt(sb
, BARRIER
))
2929 journal
->j_flags
|= JBD2_BARRIER
;
2931 journal
->j_flags
&= ~JBD2_BARRIER
;
2932 if (test_opt(sb
, DATA_ERR_ABORT
))
2933 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
2935 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
2936 spin_unlock(&journal
->j_state_lock
);
2939 static journal_t
*ext4_get_journal(struct super_block
*sb
,
2940 unsigned int journal_inum
)
2942 struct inode
*journal_inode
;
2945 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
2947 /* First, test for the existence of a valid inode on disk. Bad
2948 * things happen if we iget() an unused inode, as the subsequent
2949 * iput() will try to delete it. */
2951 journal_inode
= ext4_iget(sb
, journal_inum
);
2952 if (IS_ERR(journal_inode
)) {
2953 printk(KERN_ERR
"EXT4-fs: no journal found.\n");
2956 if (!journal_inode
->i_nlink
) {
2957 make_bad_inode(journal_inode
);
2958 iput(journal_inode
);
2959 printk(KERN_ERR
"EXT4-fs: journal inode is deleted.\n");
2963 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
2964 journal_inode
, journal_inode
->i_size
);
2965 if (!S_ISREG(journal_inode
->i_mode
)) {
2966 printk(KERN_ERR
"EXT4-fs: invalid journal inode.\n");
2967 iput(journal_inode
);
2971 journal
= jbd2_journal_init_inode(journal_inode
);
2973 printk(KERN_ERR
"EXT4-fs: Could not load journal inode\n");
2974 iput(journal_inode
);
2977 journal
->j_private
= sb
;
2978 ext4_init_journal_params(sb
, journal
);
2982 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
2985 struct buffer_head
*bh
;
2989 int hblock
, blocksize
;
2990 ext4_fsblk_t sb_block
;
2991 unsigned long offset
;
2992 struct ext4_super_block
*es
;
2993 struct block_device
*bdev
;
2995 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
2997 bdev
= ext4_blkdev_get(j_dev
);
3001 if (bd_claim(bdev
, sb
)) {
3003 "EXT4-fs: failed to claim external journal device.\n");
3004 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
3008 blocksize
= sb
->s_blocksize
;
3009 hblock
= bdev_hardsect_size(bdev
);
3010 if (blocksize
< hblock
) {
3012 "EXT4-fs: blocksize too small for journal device.\n");
3016 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
3017 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
3018 set_blocksize(bdev
, blocksize
);
3019 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
3020 printk(KERN_ERR
"EXT4-fs: couldn't read superblock of "
3021 "external journal\n");
3025 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
3026 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
3027 !(le32_to_cpu(es
->s_feature_incompat
) &
3028 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
3029 printk(KERN_ERR
"EXT4-fs: external journal has "
3030 "bad superblock\n");
3035 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
3036 printk(KERN_ERR
"EXT4-fs: journal UUID does not match\n");
3041 len
= ext4_blocks_count(es
);
3042 start
= sb_block
+ 1;
3043 brelse(bh
); /* we're done with the superblock */
3045 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
3046 start
, len
, blocksize
);
3048 printk(KERN_ERR
"EXT4-fs: failed to create device journal\n");
3051 journal
->j_private
= sb
;
3052 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
3053 wait_on_buffer(journal
->j_sb_buffer
);
3054 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
3055 printk(KERN_ERR
"EXT4-fs: I/O error on journal device\n");
3058 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
3059 printk(KERN_ERR
"EXT4-fs: External journal has more than one "
3060 "user (unsupported) - %d\n",
3061 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
3064 EXT4_SB(sb
)->journal_bdev
= bdev
;
3065 ext4_init_journal_params(sb
, journal
);
3068 jbd2_journal_destroy(journal
);
3070 ext4_blkdev_put(bdev
);
3074 static int ext4_load_journal(struct super_block
*sb
,
3075 struct ext4_super_block
*es
,
3076 unsigned long journal_devnum
)
3079 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
3082 int really_read_only
;
3084 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3086 if (journal_devnum
&&
3087 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3088 printk(KERN_INFO
"EXT4-fs: external journal device major/minor "
3089 "numbers have changed\n");
3090 journal_dev
= new_decode_dev(journal_devnum
);
3092 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
3094 really_read_only
= bdev_read_only(sb
->s_bdev
);
3097 * Are we loading a blank journal or performing recovery after a
3098 * crash? For recovery, we need to check in advance whether we
3099 * can get read-write access to the device.
3102 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3103 if (sb
->s_flags
& MS_RDONLY
) {
3104 printk(KERN_INFO
"EXT4-fs: INFO: recovery "
3105 "required on readonly filesystem.\n");
3106 if (really_read_only
) {
3107 printk(KERN_ERR
"EXT4-fs: write access "
3108 "unavailable, cannot proceed.\n");
3111 printk(KERN_INFO
"EXT4-fs: write access will "
3112 "be enabled during recovery.\n");
3116 if (journal_inum
&& journal_dev
) {
3117 printk(KERN_ERR
"EXT4-fs: filesystem has both journal "
3118 "and inode journals!\n");
3123 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
3126 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
3130 if (journal
->j_flags
& JBD2_BARRIER
)
3131 printk(KERN_INFO
"EXT4-fs: barriers enabled\n");
3133 printk(KERN_INFO
"EXT4-fs: barriers disabled\n");
3135 if (!really_read_only
&& test_opt(sb
, UPDATE_JOURNAL
)) {
3136 err
= jbd2_journal_update_format(journal
);
3138 printk(KERN_ERR
"EXT4-fs: error updating journal.\n");
3139 jbd2_journal_destroy(journal
);
3144 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
3145 err
= jbd2_journal_wipe(journal
, !really_read_only
);
3147 err
= jbd2_journal_load(journal
);
3150 printk(KERN_ERR
"EXT4-fs: error loading journal.\n");
3151 jbd2_journal_destroy(journal
);
3155 EXT4_SB(sb
)->s_journal
= journal
;
3156 ext4_clear_journal_err(sb
, es
);
3158 if (journal_devnum
&&
3159 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3160 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
3162 /* Make sure we flush the recovery flag to disk. */
3163 ext4_commit_super(sb
, 1);
3169 static int ext4_commit_super(struct super_block
*sb
, int sync
)
3171 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
3172 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
3177 if (buffer_write_io_error(sbh
)) {
3179 * Oh, dear. A previous attempt to write the
3180 * superblock failed. This could happen because the
3181 * USB device was yanked out. Or it could happen to
3182 * be a transient write error and maybe the block will
3183 * be remapped. Nothing we can do but to retry the
3184 * write and hope for the best.
3186 printk(KERN_ERR
"EXT4-fs: previous I/O error to "
3187 "superblock detected for %s.\n", sb
->s_id
);
3188 clear_buffer_write_io_error(sbh
);
3189 set_buffer_uptodate(sbh
);
3191 es
->s_wtime
= cpu_to_le32(get_seconds());
3192 es
->s_kbytes_written
=
3193 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
3194 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
3195 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
3196 ext4_free_blocks_count_set(es
, percpu_counter_sum_positive(
3197 &EXT4_SB(sb
)->s_freeblocks_counter
));
3198 es
->s_free_inodes_count
= cpu_to_le32(percpu_counter_sum_positive(
3199 &EXT4_SB(sb
)->s_freeinodes_counter
));
3201 BUFFER_TRACE(sbh
, "marking dirty");
3202 mark_buffer_dirty(sbh
);
3204 error
= sync_dirty_buffer(sbh
);
3208 error
= buffer_write_io_error(sbh
);
3210 printk(KERN_ERR
"EXT4-fs: I/O error while writing "
3211 "superblock for %s.\n", sb
->s_id
);
3212 clear_buffer_write_io_error(sbh
);
3213 set_buffer_uptodate(sbh
);
3221 * Have we just finished recovery? If so, and if we are mounting (or
3222 * remounting) the filesystem readonly, then we will end up with a
3223 * consistent fs on disk. Record that fact.
3225 static void ext4_mark_recovery_complete(struct super_block
*sb
,
3226 struct ext4_super_block
*es
)
3228 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
3230 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
3231 BUG_ON(journal
!= NULL
);
3234 jbd2_journal_lock_updates(journal
);
3235 if (jbd2_journal_flush(journal
) < 0)
3238 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
3239 sb
->s_flags
& MS_RDONLY
) {
3240 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3241 ext4_commit_super(sb
, 1);
3245 jbd2_journal_unlock_updates(journal
);
3249 * If we are mounting (or read-write remounting) a filesystem whose journal
3250 * has recorded an error from a previous lifetime, move that error to the
3251 * main filesystem now.
3253 static void ext4_clear_journal_err(struct super_block
*sb
,
3254 struct ext4_super_block
*es
)
3260 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3262 journal
= EXT4_SB(sb
)->s_journal
;
3265 * Now check for any error status which may have been recorded in the
3266 * journal by a prior ext4_error() or ext4_abort()
3269 j_errno
= jbd2_journal_errno(journal
);
3273 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
3274 ext4_warning(sb
, __func__
, "Filesystem error recorded "
3275 "from previous mount: %s", errstr
);
3276 ext4_warning(sb
, __func__
, "Marking fs in need of "
3277 "filesystem check.");
3279 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
3280 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
3281 ext4_commit_super(sb
, 1);
3283 jbd2_journal_clear_err(journal
);
3288 * Force the running and committing transactions to commit,
3289 * and wait on the commit.
3291 int ext4_force_commit(struct super_block
*sb
)
3296 if (sb
->s_flags
& MS_RDONLY
)
3299 journal
= EXT4_SB(sb
)->s_journal
;
3301 ret
= ext4_journal_force_commit(journal
);
3306 static void ext4_write_super(struct super_block
*sb
)
3308 ext4_commit_super(sb
, 1);
3311 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
3316 trace_mark(ext4_sync_fs
, "dev %s wait %d", sb
->s_id
, wait
);
3317 if (jbd2_journal_start_commit(EXT4_SB(sb
)->s_journal
, &target
)) {
3319 jbd2_log_wait_commit(EXT4_SB(sb
)->s_journal
, target
);
3325 * LVM calls this function before a (read-only) snapshot is created. This
3326 * gives us a chance to flush the journal completely and mark the fs clean.
3328 static int ext4_freeze(struct super_block
*sb
)
3333 if (sb
->s_flags
& MS_RDONLY
)
3336 journal
= EXT4_SB(sb
)->s_journal
;
3338 /* Now we set up the journal barrier. */
3339 jbd2_journal_lock_updates(journal
);
3342 * Don't clear the needs_recovery flag if we failed to flush
3345 error
= jbd2_journal_flush(journal
);
3348 jbd2_journal_unlock_updates(journal
);
3352 /* Journal blocked and flushed, clear needs_recovery flag. */
3353 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3354 error
= ext4_commit_super(sb
, 1);
3361 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3362 * flag here, even though the filesystem is not technically dirty yet.
3364 static int ext4_unfreeze(struct super_block
*sb
)
3366 if (sb
->s_flags
& MS_RDONLY
)
3370 /* Reset the needs_recovery flag before the fs is unlocked. */
3371 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3372 ext4_commit_super(sb
, 1);
3374 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
3378 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
3380 struct ext4_super_block
*es
;
3381 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3382 ext4_fsblk_t n_blocks_count
= 0;
3383 unsigned long old_sb_flags
;
3384 struct ext4_mount_options old_opts
;
3386 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3392 /* Store the original options */
3393 old_sb_flags
= sb
->s_flags
;
3394 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
3395 old_opts
.s_resuid
= sbi
->s_resuid
;
3396 old_opts
.s_resgid
= sbi
->s_resgid
;
3397 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
3398 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
3399 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
3401 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
3402 for (i
= 0; i
< MAXQUOTAS
; i
++)
3403 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
3405 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
3406 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
3409 * Allow the "check" option to be passed as a remount option.
3411 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
,
3412 &n_blocks_count
, 1)) {
3417 if (sbi
->s_mount_opt
& EXT4_MOUNT_ABORT
)
3418 ext4_abort(sb
, __func__
, "Abort forced by user");
3420 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3421 ((sbi
->s_mount_opt
& EXT4_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
3425 if (sbi
->s_journal
) {
3426 ext4_init_journal_params(sb
, sbi
->s_journal
);
3427 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
3430 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
) ||
3431 n_blocks_count
> ext4_blocks_count(es
)) {
3432 if (sbi
->s_mount_opt
& EXT4_MOUNT_ABORT
) {
3437 if (*flags
& MS_RDONLY
) {
3439 * First of all, the unconditional stuff we have to do
3440 * to disable replay of the journal when we next remount
3442 sb
->s_flags
|= MS_RDONLY
;
3445 * OK, test if we are remounting a valid rw partition
3446 * readonly, and if so set the rdonly flag and then
3447 * mark the partition as valid again.
3449 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
3450 (sbi
->s_mount_state
& EXT4_VALID_FS
))
3451 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
3454 ext4_mark_recovery_complete(sb
, es
);
3457 if ((ret
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3458 ~EXT4_FEATURE_RO_COMPAT_SUPP
))) {
3459 printk(KERN_WARNING
"EXT4-fs: %s: couldn't "
3460 "remount RDWR because of unsupported "
3461 "optional features (%x).\n", sb
->s_id
,
3462 (le32_to_cpu(sbi
->s_es
->s_feature_ro_compat
) &
3463 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
3469 * Make sure the group descriptor checksums
3470 * are sane. If they aren't, refuse to
3473 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
3474 struct ext4_group_desc
*gdp
=
3475 ext4_get_group_desc(sb
, g
, NULL
);
3477 if (!ext4_group_desc_csum_verify(sbi
, g
, gdp
)) {
3479 "EXT4-fs: ext4_remount: "
3480 "Checksum for group %u failed (%u!=%u)\n",
3481 g
, le16_to_cpu(ext4_group_desc_csum(sbi
, g
, gdp
)),
3482 le16_to_cpu(gdp
->bg_checksum
));
3489 * If we have an unprocessed orphan list hanging
3490 * around from a previously readonly bdev mount,
3491 * require a full umount/remount for now.
3493 if (es
->s_last_orphan
) {
3494 printk(KERN_WARNING
"EXT4-fs: %s: couldn't "
3495 "remount RDWR because of unprocessed "
3496 "orphan inode list. Please "
3497 "umount/remount instead.\n",
3504 * Mounting a RDONLY partition read-write, so reread
3505 * and store the current valid flag. (It may have
3506 * been changed by e2fsck since we originally mounted
3510 ext4_clear_journal_err(sb
, es
);
3511 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3512 if ((err
= ext4_group_extend(sb
, es
, n_blocks_count
)))
3514 if (!ext4_setup_super(sb
, es
, 0))
3515 sb
->s_flags
&= ~MS_RDONLY
;
3518 if (sbi
->s_journal
== NULL
)
3519 ext4_commit_super(sb
, 1);
3522 /* Release old quota file names */
3523 for (i
= 0; i
< MAXQUOTAS
; i
++)
3524 if (old_opts
.s_qf_names
[i
] &&
3525 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3526 kfree(old_opts
.s_qf_names
[i
]);
3530 sb
->s_flags
= old_sb_flags
;
3531 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
3532 sbi
->s_resuid
= old_opts
.s_resuid
;
3533 sbi
->s_resgid
= old_opts
.s_resgid
;
3534 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
3535 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
3536 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
3538 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
3539 for (i
= 0; i
< MAXQUOTAS
; i
++) {
3540 if (sbi
->s_qf_names
[i
] &&
3541 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3542 kfree(sbi
->s_qf_names
[i
]);
3543 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
3549 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
3551 struct super_block
*sb
= dentry
->d_sb
;
3552 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3553 struct ext4_super_block
*es
= sbi
->s_es
;
3556 if (test_opt(sb
, MINIX_DF
)) {
3557 sbi
->s_overhead_last
= 0;
3558 } else if (sbi
->s_blocks_last
!= ext4_blocks_count(es
)) {
3559 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3560 ext4_fsblk_t overhead
= 0;
3563 * Compute the overhead (FS structures). This is constant
3564 * for a given filesystem unless the number of block groups
3565 * changes so we cache the previous value until it does.
3569 * All of the blocks before first_data_block are
3572 overhead
= le32_to_cpu(es
->s_first_data_block
);
3575 * Add the overhead attributed to the superblock and
3576 * block group descriptors. If the sparse superblocks
3577 * feature is turned on, then not all groups have this.
3579 for (i
= 0; i
< ngroups
; i
++) {
3580 overhead
+= ext4_bg_has_super(sb
, i
) +
3581 ext4_bg_num_gdb(sb
, i
);
3586 * Every block group has an inode bitmap, a block
3587 * bitmap, and an inode table.
3589 overhead
+= ngroups
* (2 + sbi
->s_itb_per_group
);
3590 sbi
->s_overhead_last
= overhead
;
3592 sbi
->s_blocks_last
= ext4_blocks_count(es
);
3595 buf
->f_type
= EXT4_SUPER_MAGIC
;
3596 buf
->f_bsize
= sb
->s_blocksize
;
3597 buf
->f_blocks
= ext4_blocks_count(es
) - sbi
->s_overhead_last
;
3598 buf
->f_bfree
= percpu_counter_sum_positive(&sbi
->s_freeblocks_counter
) -
3599 percpu_counter_sum_positive(&sbi
->s_dirtyblocks_counter
);
3600 ext4_free_blocks_count_set(es
, buf
->f_bfree
);
3601 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
3602 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
3604 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
3605 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
3606 es
->s_free_inodes_count
= cpu_to_le32(buf
->f_ffree
);
3607 buf
->f_namelen
= EXT4_NAME_LEN
;
3608 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
3609 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
3610 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
3611 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
3615 /* Helper function for writing quotas on sync - we need to start transaction before quota file
3616 * is locked for write. Otherwise the are possible deadlocks:
3617 * Process 1 Process 2
3618 * ext4_create() quota_sync()
3619 * jbd2_journal_start() write_dquot()
3620 * vfs_dq_init() down(dqio_mutex)
3621 * down(dqio_mutex) jbd2_journal_start()
3627 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
3629 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_type
];
3632 static int ext4_write_dquot(struct dquot
*dquot
)
3636 struct inode
*inode
;
3638 inode
= dquot_to_inode(dquot
);
3639 handle
= ext4_journal_start(inode
,
3640 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
3642 return PTR_ERR(handle
);
3643 ret
= dquot_commit(dquot
);
3644 err
= ext4_journal_stop(handle
);
3650 static int ext4_acquire_dquot(struct dquot
*dquot
)
3655 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3656 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
3658 return PTR_ERR(handle
);
3659 ret
= dquot_acquire(dquot
);
3660 err
= ext4_journal_stop(handle
);
3666 static int ext4_release_dquot(struct dquot
*dquot
)
3671 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3672 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
3673 if (IS_ERR(handle
)) {
3674 /* Release dquot anyway to avoid endless cycle in dqput() */
3675 dquot_release(dquot
);
3676 return PTR_ERR(handle
);
3678 ret
= dquot_release(dquot
);
3679 err
= ext4_journal_stop(handle
);
3685 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
3687 /* Are we journaling quotas? */
3688 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
3689 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
3690 dquot_mark_dquot_dirty(dquot
);
3691 return ext4_write_dquot(dquot
);
3693 return dquot_mark_dquot_dirty(dquot
);
3697 static int ext4_write_info(struct super_block
*sb
, int type
)
3702 /* Data block + inode block */
3703 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
3705 return PTR_ERR(handle
);
3706 ret
= dquot_commit_info(sb
, type
);
3707 err
= ext4_journal_stop(handle
);
3714 * Turn on quotas during mount time - we need to find
3715 * the quota file and such...
3717 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
3719 return vfs_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
3720 EXT4_SB(sb
)->s_jquota_fmt
, type
);
3724 * Standard function to be called on quota_on
3726 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
3727 char *name
, int remount
)
3732 if (!test_opt(sb
, QUOTA
))
3734 /* When remounting, no checks are needed and in fact, name is NULL */
3736 return vfs_quota_on(sb
, type
, format_id
, name
, remount
);
3738 err
= kern_path(name
, LOOKUP_FOLLOW
, &path
);
3742 /* Quotafile not on the same filesystem? */
3743 if (path
.mnt
->mnt_sb
!= sb
) {
3747 /* Journaling quota? */
3748 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
3749 /* Quotafile not in fs root? */
3750 if (path
.dentry
->d_parent
!= sb
->s_root
)
3752 "EXT4-fs: Quota file not on filesystem root. "
3753 "Journaled quota will not work.\n");
3757 * When we journal data on quota file, we have to flush journal to see
3758 * all updates to the file when we bypass pagecache...
3760 if (EXT4_SB(sb
)->s_journal
&&
3761 ext4_should_journal_data(path
.dentry
->d_inode
)) {
3763 * We don't need to lock updates but journal_flush() could
3764 * otherwise be livelocked...
3766 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
3767 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
3768 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
3775 err
= vfs_quota_on_path(sb
, type
, format_id
, &path
);
3780 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3781 * acquiring the locks... As quota files are never truncated and quota code
3782 * itself serializes the operations (and noone else should touch the files)
3783 * we don't have to be afraid of races */
3784 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
3785 size_t len
, loff_t off
)
3787 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
3788 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
3790 int offset
= off
& (sb
->s_blocksize
- 1);
3793 struct buffer_head
*bh
;
3794 loff_t i_size
= i_size_read(inode
);
3798 if (off
+len
> i_size
)
3801 while (toread
> 0) {
3802 tocopy
= sb
->s_blocksize
- offset
< toread
?
3803 sb
->s_blocksize
- offset
: toread
;
3804 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
3807 if (!bh
) /* A hole? */
3808 memset(data
, 0, tocopy
);
3810 memcpy(data
, bh
->b_data
+offset
, tocopy
);
3820 /* Write to quotafile (we know the transaction is already started and has
3821 * enough credits) */
3822 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
3823 const char *data
, size_t len
, loff_t off
)
3825 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
3826 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
3828 int offset
= off
& (sb
->s_blocksize
- 1);
3830 int journal_quota
= EXT4_SB(sb
)->s_qf_names
[type
] != NULL
;
3831 size_t towrite
= len
;
3832 struct buffer_head
*bh
;
3833 handle_t
*handle
= journal_current_handle();
3835 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
3836 printk(KERN_WARNING
"EXT4-fs: Quota write (off=%llu, len=%llu)"
3837 " cancelled because transaction is not started.\n",
3838 (unsigned long long)off
, (unsigned long long)len
);
3841 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
3842 while (towrite
> 0) {
3843 tocopy
= sb
->s_blocksize
- offset
< towrite
?
3844 sb
->s_blocksize
- offset
: towrite
;
3845 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
3848 if (journal_quota
) {
3849 err
= ext4_journal_get_write_access(handle
, bh
);
3856 memcpy(bh
->b_data
+offset
, data
, tocopy
);
3857 flush_dcache_page(bh
->b_page
);
3860 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
3862 /* Always do at least ordered writes for quotas */
3863 err
= ext4_jbd2_file_inode(handle
, inode
);
3864 mark_buffer_dirty(bh
);
3875 if (len
== towrite
) {
3876 mutex_unlock(&inode
->i_mutex
);
3879 if (inode
->i_size
< off
+len
-towrite
) {
3880 i_size_write(inode
, off
+len
-towrite
);
3881 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
3883 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
3884 ext4_mark_inode_dirty(handle
, inode
);
3885 mutex_unlock(&inode
->i_mutex
);
3886 return len
- towrite
;
3891 static int ext4_get_sb(struct file_system_type
*fs_type
,
3892 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
3894 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
, mnt
);
3897 static struct file_system_type ext4_fs_type
= {
3898 .owner
= THIS_MODULE
,
3900 .get_sb
= ext4_get_sb
,
3901 .kill_sb
= kill_block_super
,
3902 .fs_flags
= FS_REQUIRES_DEV
,
3905 #ifdef CONFIG_EXT4DEV_COMPAT
3906 static int ext4dev_get_sb(struct file_system_type
*fs_type
,
3907 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
3909 printk(KERN_WARNING
"EXT4-fs: Update your userspace programs "
3910 "to mount using ext4\n");
3911 printk(KERN_WARNING
"EXT4-fs: ext4dev backwards compatibility "
3912 "will go away by 2.6.31\n");
3913 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
, mnt
);
3916 static struct file_system_type ext4dev_fs_type
= {
3917 .owner
= THIS_MODULE
,
3919 .get_sb
= ext4dev_get_sb
,
3920 .kill_sb
= kill_block_super
,
3921 .fs_flags
= FS_REQUIRES_DEV
,
3923 MODULE_ALIAS("ext4dev");
3926 static int __init
init_ext4_fs(void)
3930 ext4_kset
= kset_create_and_add("ext4", NULL
, fs_kobj
);
3933 ext4_proc_root
= proc_mkdir("fs/ext4", NULL
);
3934 err
= init_ext4_mballoc();
3938 err
= init_ext4_xattr();
3941 err
= init_inodecache();
3944 err
= register_filesystem(&ext4_fs_type
);
3947 #ifdef CONFIG_EXT4DEV_COMPAT
3948 err
= register_filesystem(&ext4dev_fs_type
);
3950 unregister_filesystem(&ext4_fs_type
);
3956 destroy_inodecache();
3960 exit_ext4_mballoc();
3964 static void __exit
exit_ext4_fs(void)
3966 unregister_filesystem(&ext4_fs_type
);
3967 #ifdef CONFIG_EXT4DEV_COMPAT
3968 unregister_filesystem(&ext4dev_fs_type
);
3970 destroy_inodecache();
3972 exit_ext4_mballoc();
3973 remove_proc_entry("fs/ext4", NULL
);
3974 kset_unregister(ext4_kset
);
3977 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3978 MODULE_DESCRIPTION("Fourth Extended Filesystem");
3979 MODULE_LICENSE("GPL");
3980 module_init(init_ext4_fs
)
3981 module_exit(exit_ext4_fs
)