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__
, "Detected aborted journal");
211 return ERR_PTR(-EROFS
);
213 return jbd2_journal_start(journal
, nblocks
);
216 * We're not journaling, return the appropriate indication.
218 current
->journal_info
= EXT4_NOJOURNAL_HANDLE
;
219 return current
->journal_info
;
223 * The only special thing we need to do here is to make sure that all
224 * jbd2_journal_stop calls result in the superblock being marked dirty, so
225 * that sync() will call the filesystem's write_super callback if
228 int __ext4_journal_stop(const char *where
, handle_t
*handle
)
230 struct super_block
*sb
;
234 if (!ext4_handle_valid(handle
)) {
236 * Do this here since we don't call jbd2_journal_stop() in
239 current
->journal_info
= NULL
;
242 sb
= handle
->h_transaction
->t_journal
->j_private
;
244 rc
= jbd2_journal_stop(handle
);
249 __ext4_std_error(sb
, where
, err
);
253 void ext4_journal_abort_handle(const char *caller
, const char *err_fn
,
254 struct buffer_head
*bh
, handle_t
*handle
, int err
)
257 const char *errstr
= ext4_decode_error(NULL
, err
, nbuf
);
259 BUG_ON(!ext4_handle_valid(handle
));
262 BUFFER_TRACE(bh
, "abort");
267 if (is_handle_aborted(handle
))
270 printk(KERN_ERR
"%s: aborting transaction: %s in %s\n",
271 caller
, errstr
, err_fn
);
273 jbd2_journal_abort_handle(handle
);
276 /* Deal with the reporting of failure conditions on a filesystem such as
277 * inconsistencies detected or read IO failures.
279 * On ext2, we can store the error state of the filesystem in the
280 * superblock. That is not possible on ext4, because we may have other
281 * write ordering constraints on the superblock which prevent us from
282 * writing it out straight away; and given that the journal is about to
283 * be aborted, we can't rely on the current, or future, transactions to
284 * write out the superblock safely.
286 * We'll just use the jbd2_journal_abort() error code to record an error in
287 * the journal instead. On recovery, the journal will compain about
288 * that error until we've noted it down and cleared it.
291 static void ext4_handle_error(struct super_block
*sb
)
293 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
295 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
296 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
298 if (sb
->s_flags
& MS_RDONLY
)
301 if (!test_opt(sb
, ERRORS_CONT
)) {
302 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
304 EXT4_SB(sb
)->s_mount_opt
|= EXT4_MOUNT_ABORT
;
306 jbd2_journal_abort(journal
, -EIO
);
308 if (test_opt(sb
, ERRORS_RO
)) {
309 printk(KERN_CRIT
"Remounting filesystem read-only\n");
310 sb
->s_flags
|= MS_RDONLY
;
312 ext4_commit_super(sb
, 1);
313 if (test_opt(sb
, ERRORS_PANIC
))
314 panic("EXT4-fs (device %s): panic forced after error\n",
318 void ext4_error(struct super_block
*sb
, const char *function
,
319 const char *fmt
, ...)
324 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
329 ext4_handle_error(sb
);
332 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
339 errstr
= "IO failure";
342 errstr
= "Out of memory";
345 if (!sb
|| EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
)
346 errstr
= "Journal has aborted";
348 errstr
= "Readonly filesystem";
351 /* If the caller passed in an extra buffer for unknown
352 * errors, textualise them now. Else we just return
355 /* Check for truncated error codes... */
356 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
365 /* __ext4_std_error decodes expected errors from journaling functions
366 * automatically and invokes the appropriate error response. */
368 void __ext4_std_error(struct super_block
*sb
, const char *function
, int errno
)
373 /* Special case: if the error is EROFS, and we're not already
374 * inside a transaction, then there's really no point in logging
376 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
377 (sb
->s_flags
& MS_RDONLY
))
380 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
381 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s: %s\n",
382 sb
->s_id
, function
, errstr
);
384 ext4_handle_error(sb
);
388 * ext4_abort is a much stronger failure handler than ext4_error. The
389 * abort function may be used to deal with unrecoverable failures such
390 * as journal IO errors or ENOMEM at a critical moment in log management.
392 * We unconditionally force the filesystem into an ABORT|READONLY state,
393 * unless the error response on the fs has been set to panic in which
394 * case we take the easy way out and panic immediately.
397 void ext4_abort(struct super_block
*sb
, const char *function
,
398 const char *fmt
, ...)
402 printk(KERN_CRIT
"ext4_abort called.\n");
405 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
410 if (test_opt(sb
, ERRORS_PANIC
))
411 panic("EXT4-fs panic from previous error\n");
413 if (sb
->s_flags
& MS_RDONLY
)
416 printk(KERN_CRIT
"Remounting filesystem read-only\n");
417 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
418 sb
->s_flags
|= MS_RDONLY
;
419 EXT4_SB(sb
)->s_mount_opt
|= EXT4_MOUNT_ABORT
;
420 if (EXT4_SB(sb
)->s_journal
)
421 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
424 void ext4_warning(struct super_block
*sb
, const char *function
,
425 const char *fmt
, ...)
430 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s: ",
437 void ext4_grp_locked_error(struct super_block
*sb
, ext4_group_t grp
,
438 const char *function
, const char *fmt
, ...)
443 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
446 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
451 if (test_opt(sb
, ERRORS_CONT
)) {
452 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
453 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
454 ext4_commit_super(sb
, 0);
457 ext4_unlock_group(sb
, grp
);
458 ext4_handle_error(sb
);
460 * We only get here in the ERRORS_RO case; relocking the group
461 * may be dangerous, but nothing bad will happen since the
462 * filesystem will have already been marked read/only and the
463 * journal has been aborted. We return 1 as a hint to callers
464 * who might what to use the return value from
465 * ext4_grp_locked_error() to distinguish beween the
466 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
467 * aggressively from the ext4 function in question, with a
468 * more appropriate error code.
470 ext4_lock_group(sb
, grp
);
474 void ext4_update_dynamic_rev(struct super_block
*sb
)
476 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
478 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
481 ext4_warning(sb
, __func__
,
482 "updating to rev %d because of new feature flag, "
483 "running e2fsck is recommended",
486 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
487 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
488 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
489 /* leave es->s_feature_*compat flags alone */
490 /* es->s_uuid will be set by e2fsck if empty */
493 * The rest of the superblock fields should be zero, and if not it
494 * means they are likely already in use, so leave them alone. We
495 * can leave it up to e2fsck to clean up any inconsistencies there.
500 * Open the external journal device
502 static struct block_device
*ext4_blkdev_get(dev_t dev
)
504 struct block_device
*bdev
;
505 char b
[BDEVNAME_SIZE
];
507 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
513 printk(KERN_ERR
"EXT4-fs: failed to open journal device %s: %ld\n",
514 __bdevname(dev
, b
), PTR_ERR(bdev
));
519 * Release the journal device
521 static int ext4_blkdev_put(struct block_device
*bdev
)
524 return blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
527 static int ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
529 struct block_device
*bdev
;
532 bdev
= sbi
->journal_bdev
;
534 ret
= ext4_blkdev_put(bdev
);
535 sbi
->journal_bdev
= NULL
;
540 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
542 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
545 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
549 printk(KERN_ERR
"sb orphan head is %d\n",
550 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
552 printk(KERN_ERR
"sb_info orphan list:\n");
553 list_for_each(l
, &sbi
->s_orphan
) {
554 struct inode
*inode
= orphan_list_entry(l
);
556 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
557 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
558 inode
->i_mode
, inode
->i_nlink
,
563 static void ext4_put_super(struct super_block
*sb
)
565 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
566 struct ext4_super_block
*es
= sbi
->s_es
;
569 ext4_release_system_zone(sb
);
571 ext4_ext_release(sb
);
572 ext4_xattr_put_super(sb
);
573 if (sbi
->s_journal
) {
574 err
= jbd2_journal_destroy(sbi
->s_journal
);
575 sbi
->s_journal
= NULL
;
577 ext4_abort(sb
, __func__
,
578 "Couldn't clean up the journal");
580 if (!(sb
->s_flags
& MS_RDONLY
)) {
581 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
582 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
583 ext4_commit_super(sb
, 1);
586 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
588 kobject_del(&sbi
->s_kobj
);
590 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
591 brelse(sbi
->s_group_desc
[i
]);
592 kfree(sbi
->s_group_desc
);
593 if (is_vmalloc_addr(sbi
->s_flex_groups
))
594 vfree(sbi
->s_flex_groups
);
596 kfree(sbi
->s_flex_groups
);
597 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
598 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
599 percpu_counter_destroy(&sbi
->s_dirs_counter
);
600 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
603 for (i
= 0; i
< MAXQUOTAS
; i
++)
604 kfree(sbi
->s_qf_names
[i
]);
607 /* Debugging code just in case the in-memory inode orphan list
608 * isn't empty. The on-disk one can be non-empty if we've
609 * detected an error and taken the fs readonly, but the
610 * in-memory list had better be clean by this point. */
611 if (!list_empty(&sbi
->s_orphan
))
612 dump_orphan_list(sb
, sbi
);
613 J_ASSERT(list_empty(&sbi
->s_orphan
));
615 invalidate_bdev(sb
->s_bdev
);
616 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
618 * Invalidate the journal device's buffers. We don't want them
619 * floating about in memory - the physical journal device may
620 * hotswapped, and it breaks the `ro-after' testing code.
622 sync_blockdev(sbi
->journal_bdev
);
623 invalidate_bdev(sbi
->journal_bdev
);
624 ext4_blkdev_remove(sbi
);
626 sb
->s_fs_info
= NULL
;
628 * Now that we are completely done shutting down the
629 * superblock, we need to actually destroy the kobject.
633 kobject_put(&sbi
->s_kobj
);
634 wait_for_completion(&sbi
->s_kobj_unregister
);
637 kfree(sbi
->s_blockgroup_lock
);
641 static struct kmem_cache
*ext4_inode_cachep
;
644 * Called inside transaction, so use GFP_NOFS
646 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
648 struct ext4_inode_info
*ei
;
650 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
654 #ifdef CONFIG_EXT4_FS_POSIX_ACL
655 ei
->i_acl
= EXT4_ACL_NOT_CACHED
;
656 ei
->i_default_acl
= EXT4_ACL_NOT_CACHED
;
658 ei
->vfs_inode
.i_version
= 1;
659 ei
->vfs_inode
.i_data
.writeback_index
= 0;
660 memset(&ei
->i_cached_extent
, 0, sizeof(struct ext4_ext_cache
));
661 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
662 spin_lock_init(&ei
->i_prealloc_lock
);
664 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
665 * therefore it can be null here. Don't check it, just initialize
668 jbd2_journal_init_jbd_inode(&ei
->jinode
, &ei
->vfs_inode
);
669 ei
->i_reserved_data_blocks
= 0;
670 ei
->i_reserved_meta_blocks
= 0;
671 ei
->i_allocated_meta_blocks
= 0;
672 ei
->i_delalloc_reserved_flag
= 0;
673 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
,
937 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
939 WARN_ON(PageChecked(page
));
940 if (!page_has_buffers(page
))
943 return jbd2_journal_try_to_free_buffers(journal
, page
,
945 return try_to_free_buffers(page
);
949 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
950 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
952 static int ext4_write_dquot(struct dquot
*dquot
);
953 static int ext4_acquire_dquot(struct dquot
*dquot
);
954 static int ext4_release_dquot(struct dquot
*dquot
);
955 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
956 static int ext4_write_info(struct super_block
*sb
, int type
);
957 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
958 char *path
, int remount
);
959 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
960 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
961 size_t len
, loff_t off
);
962 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
963 const char *data
, size_t len
, loff_t off
);
965 static struct dquot_operations ext4_quota_operations
= {
966 .initialize
= dquot_initialize
,
968 .alloc_space
= dquot_alloc_space
,
969 .reserve_space
= dquot_reserve_space
,
970 .claim_space
= dquot_claim_space
,
971 .release_rsv
= dquot_release_reserved_space
,
972 .get_reserved_space
= ext4_get_reserved_space
,
973 .alloc_inode
= dquot_alloc_inode
,
974 .free_space
= dquot_free_space
,
975 .free_inode
= dquot_free_inode
,
976 .transfer
= dquot_transfer
,
977 .write_dquot
= ext4_write_dquot
,
978 .acquire_dquot
= ext4_acquire_dquot
,
979 .release_dquot
= ext4_release_dquot
,
980 .mark_dirty
= ext4_mark_dquot_dirty
,
981 .write_info
= ext4_write_info
,
982 .alloc_dquot
= dquot_alloc
,
983 .destroy_dquot
= dquot_destroy
,
986 static struct quotactl_ops ext4_qctl_operations
= {
987 .quota_on
= ext4_quota_on
,
988 .quota_off
= vfs_quota_off
,
989 .quota_sync
= vfs_quota_sync
,
990 .get_info
= vfs_get_dqinfo
,
991 .set_info
= vfs_set_dqinfo
,
992 .get_dqblk
= vfs_get_dqblk
,
993 .set_dqblk
= vfs_set_dqblk
997 static const struct super_operations ext4_sops
= {
998 .alloc_inode
= ext4_alloc_inode
,
999 .destroy_inode
= ext4_destroy_inode
,
1000 .write_inode
= ext4_write_inode
,
1001 .dirty_inode
= ext4_dirty_inode
,
1002 .delete_inode
= ext4_delete_inode
,
1003 .put_super
= ext4_put_super
,
1004 .sync_fs
= ext4_sync_fs
,
1005 .freeze_fs
= ext4_freeze
,
1006 .unfreeze_fs
= ext4_unfreeze
,
1007 .statfs
= ext4_statfs
,
1008 .remount_fs
= ext4_remount
,
1009 .clear_inode
= ext4_clear_inode
,
1010 .show_options
= ext4_show_options
,
1012 .quota_read
= ext4_quota_read
,
1013 .quota_write
= ext4_quota_write
,
1015 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1018 static const struct super_operations ext4_nojournal_sops
= {
1019 .alloc_inode
= ext4_alloc_inode
,
1020 .destroy_inode
= ext4_destroy_inode
,
1021 .write_inode
= ext4_write_inode
,
1022 .dirty_inode
= ext4_dirty_inode
,
1023 .delete_inode
= ext4_delete_inode
,
1024 .write_super
= ext4_write_super
,
1025 .put_super
= ext4_put_super
,
1026 .statfs
= ext4_statfs
,
1027 .remount_fs
= ext4_remount
,
1028 .clear_inode
= ext4_clear_inode
,
1029 .show_options
= ext4_show_options
,
1031 .quota_read
= ext4_quota_read
,
1032 .quota_write
= ext4_quota_write
,
1034 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1037 static const struct export_operations ext4_export_ops
= {
1038 .fh_to_dentry
= ext4_fh_to_dentry
,
1039 .fh_to_parent
= ext4_fh_to_parent
,
1040 .get_parent
= ext4_get_parent
,
1044 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1045 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1046 Opt_nouid32
, Opt_debug
, Opt_oldalloc
, Opt_orlov
,
1047 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1048 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
, Opt_nobh
, Opt_bh
,
1049 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
,
1050 Opt_journal_update
, Opt_journal_dev
,
1051 Opt_journal_checksum
, Opt_journal_async_commit
,
1052 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1053 Opt_data_err_abort
, Opt_data_err_ignore
, Opt_mb_history_length
,
1054 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1055 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_quota
, Opt_noquota
,
1056 Opt_ignore
, Opt_barrier
, Opt_nobarrier
, Opt_err
, Opt_resize
,
1057 Opt_usrquota
, Opt_grpquota
, Opt_i_version
,
1058 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
,
1059 Opt_block_validity
, Opt_noblock_validity
,
1060 Opt_inode_readahead_blks
, Opt_journal_ioprio
1063 static const match_table_t tokens
= {
1064 {Opt_bsd_df
, "bsddf"},
1065 {Opt_minix_df
, "minixdf"},
1066 {Opt_grpid
, "grpid"},
1067 {Opt_grpid
, "bsdgroups"},
1068 {Opt_nogrpid
, "nogrpid"},
1069 {Opt_nogrpid
, "sysvgroups"},
1070 {Opt_resgid
, "resgid=%u"},
1071 {Opt_resuid
, "resuid=%u"},
1073 {Opt_err_cont
, "errors=continue"},
1074 {Opt_err_panic
, "errors=panic"},
1075 {Opt_err_ro
, "errors=remount-ro"},
1076 {Opt_nouid32
, "nouid32"},
1077 {Opt_debug
, "debug"},
1078 {Opt_oldalloc
, "oldalloc"},
1079 {Opt_orlov
, "orlov"},
1080 {Opt_user_xattr
, "user_xattr"},
1081 {Opt_nouser_xattr
, "nouser_xattr"},
1083 {Opt_noacl
, "noacl"},
1084 {Opt_noload
, "noload"},
1087 {Opt_commit
, "commit=%u"},
1088 {Opt_min_batch_time
, "min_batch_time=%u"},
1089 {Opt_max_batch_time
, "max_batch_time=%u"},
1090 {Opt_journal_update
, "journal=update"},
1091 {Opt_journal_dev
, "journal_dev=%u"},
1092 {Opt_journal_checksum
, "journal_checksum"},
1093 {Opt_journal_async_commit
, "journal_async_commit"},
1094 {Opt_abort
, "abort"},
1095 {Opt_data_journal
, "data=journal"},
1096 {Opt_data_ordered
, "data=ordered"},
1097 {Opt_data_writeback
, "data=writeback"},
1098 {Opt_data_err_abort
, "data_err=abort"},
1099 {Opt_data_err_ignore
, "data_err=ignore"},
1100 {Opt_mb_history_length
, "mb_history_length=%u"},
1101 {Opt_offusrjquota
, "usrjquota="},
1102 {Opt_usrjquota
, "usrjquota=%s"},
1103 {Opt_offgrpjquota
, "grpjquota="},
1104 {Opt_grpjquota
, "grpjquota=%s"},
1105 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1106 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1107 {Opt_grpquota
, "grpquota"},
1108 {Opt_noquota
, "noquota"},
1109 {Opt_quota
, "quota"},
1110 {Opt_usrquota
, "usrquota"},
1111 {Opt_barrier
, "barrier=%u"},
1112 {Opt_barrier
, "barrier"},
1113 {Opt_nobarrier
, "nobarrier"},
1114 {Opt_i_version
, "i_version"},
1115 {Opt_stripe
, "stripe=%u"},
1116 {Opt_resize
, "resize"},
1117 {Opt_delalloc
, "delalloc"},
1118 {Opt_nodelalloc
, "nodelalloc"},
1119 {Opt_block_validity
, "block_validity"},
1120 {Opt_noblock_validity
, "noblock_validity"},
1121 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1122 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1123 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1124 {Opt_auto_da_alloc
, "auto_da_alloc"},
1125 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1129 static ext4_fsblk_t
get_sb_block(void **data
)
1131 ext4_fsblk_t sb_block
;
1132 char *options
= (char *) *data
;
1134 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1135 return 1; /* Default location */
1138 /* TODO: use simple_strtoll with >32bit ext4 */
1139 sb_block
= simple_strtoul(options
, &options
, 0);
1140 if (*options
&& *options
!= ',') {
1141 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1145 if (*options
== ',')
1147 *data
= (void *) options
;
1152 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1154 static int parse_options(char *options
, struct super_block
*sb
,
1155 unsigned long *journal_devnum
,
1156 unsigned int *journal_ioprio
,
1157 ext4_fsblk_t
*n_blocks_count
, int is_remount
)
1159 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1161 substring_t args
[MAX_OPT_ARGS
];
1172 while ((p
= strsep(&options
, ",")) != NULL
) {
1177 token
= match_token(p
, tokens
, args
);
1180 clear_opt(sbi
->s_mount_opt
, MINIX_DF
);
1183 set_opt(sbi
->s_mount_opt
, MINIX_DF
);
1186 set_opt(sbi
->s_mount_opt
, GRPID
);
1189 clear_opt(sbi
->s_mount_opt
, GRPID
);
1192 if (match_int(&args
[0], &option
))
1194 sbi
->s_resuid
= option
;
1197 if (match_int(&args
[0], &option
))
1199 sbi
->s_resgid
= option
;
1202 /* handled by get_sb_block() instead of here */
1203 /* *sb_block = match_int(&args[0]); */
1206 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1207 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1208 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1211 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1212 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1213 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1216 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1217 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1218 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1221 set_opt(sbi
->s_mount_opt
, NO_UID32
);
1224 set_opt(sbi
->s_mount_opt
, DEBUG
);
1227 set_opt(sbi
->s_mount_opt
, OLDALLOC
);
1230 clear_opt(sbi
->s_mount_opt
, OLDALLOC
);
1232 #ifdef CONFIG_EXT4_FS_XATTR
1233 case Opt_user_xattr
:
1234 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
1236 case Opt_nouser_xattr
:
1237 clear_opt(sbi
->s_mount_opt
, XATTR_USER
);
1240 case Opt_user_xattr
:
1241 case Opt_nouser_xattr
:
1242 printk(KERN_ERR
"EXT4 (no)user_xattr options "
1246 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1248 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1251 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1256 printk(KERN_ERR
"EXT4 (no)acl options "
1260 case Opt_journal_update
:
1262 /* Eventually we will want to be able to create
1263 a journal file here. For now, only allow the
1264 user to specify an existing inode to be the
1267 printk(KERN_ERR
"EXT4-fs: cannot specify "
1268 "journal on remount\n");
1271 set_opt(sbi
->s_mount_opt
, UPDATE_JOURNAL
);
1273 case Opt_journal_dev
:
1275 printk(KERN_ERR
"EXT4-fs: cannot specify "
1276 "journal on remount\n");
1279 if (match_int(&args
[0], &option
))
1281 *journal_devnum
= option
;
1283 case Opt_journal_checksum
:
1284 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1286 case Opt_journal_async_commit
:
1287 set_opt(sbi
->s_mount_opt
, JOURNAL_ASYNC_COMMIT
);
1288 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1291 set_opt(sbi
->s_mount_opt
, NOLOAD
);
1294 if (match_int(&args
[0], &option
))
1299 option
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1300 sbi
->s_commit_interval
= HZ
* option
;
1302 case Opt_max_batch_time
:
1303 if (match_int(&args
[0], &option
))
1308 option
= EXT4_DEF_MAX_BATCH_TIME
;
1309 sbi
->s_max_batch_time
= option
;
1311 case Opt_min_batch_time
:
1312 if (match_int(&args
[0], &option
))
1316 sbi
->s_min_batch_time
= option
;
1318 case Opt_data_journal
:
1319 data_opt
= EXT4_MOUNT_JOURNAL_DATA
;
1321 case Opt_data_ordered
:
1322 data_opt
= EXT4_MOUNT_ORDERED_DATA
;
1324 case Opt_data_writeback
:
1325 data_opt
= EXT4_MOUNT_WRITEBACK_DATA
;
1328 if ((sbi
->s_mount_opt
& EXT4_MOUNT_DATA_FLAGS
)
1331 "EXT4-fs: cannot change data "
1332 "mode on remount\n");
1336 sbi
->s_mount_opt
&= ~EXT4_MOUNT_DATA_FLAGS
;
1337 sbi
->s_mount_opt
|= data_opt
;
1340 case Opt_data_err_abort
:
1341 set_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1343 case Opt_data_err_ignore
:
1344 clear_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1346 case Opt_mb_history_length
:
1347 if (match_int(&args
[0], &option
))
1351 sbi
->s_mb_history_max
= option
;
1360 if (sb_any_quota_loaded(sb
) &&
1361 !sbi
->s_qf_names
[qtype
]) {
1363 "EXT4-fs: Cannot change journaled "
1364 "quota options when quota turned on.\n");
1367 qname
= match_strdup(&args
[0]);
1370 "EXT4-fs: not enough memory for "
1371 "storing quotafile name.\n");
1374 if (sbi
->s_qf_names
[qtype
] &&
1375 strcmp(sbi
->s_qf_names
[qtype
], qname
)) {
1377 "EXT4-fs: %s quota file already "
1378 "specified.\n", QTYPE2NAME(qtype
));
1382 sbi
->s_qf_names
[qtype
] = qname
;
1383 if (strchr(sbi
->s_qf_names
[qtype
], '/')) {
1385 "EXT4-fs: quotafile must be on "
1386 "filesystem root.\n");
1387 kfree(sbi
->s_qf_names
[qtype
]);
1388 sbi
->s_qf_names
[qtype
] = NULL
;
1391 set_opt(sbi
->s_mount_opt
, QUOTA
);
1393 case Opt_offusrjquota
:
1396 case Opt_offgrpjquota
:
1399 if (sb_any_quota_loaded(sb
) &&
1400 sbi
->s_qf_names
[qtype
]) {
1401 printk(KERN_ERR
"EXT4-fs: Cannot change "
1402 "journaled quota options when "
1403 "quota turned on.\n");
1407 * The space will be released later when all options
1408 * are confirmed to be correct
1410 sbi
->s_qf_names
[qtype
] = NULL
;
1412 case Opt_jqfmt_vfsold
:
1413 qfmt
= QFMT_VFS_OLD
;
1415 case Opt_jqfmt_vfsv0
:
1418 if (sb_any_quota_loaded(sb
) &&
1419 sbi
->s_jquota_fmt
!= qfmt
) {
1420 printk(KERN_ERR
"EXT4-fs: Cannot change "
1421 "journaled quota options when "
1422 "quota turned on.\n");
1425 sbi
->s_jquota_fmt
= qfmt
;
1429 set_opt(sbi
->s_mount_opt
, QUOTA
);
1430 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
1433 set_opt(sbi
->s_mount_opt
, QUOTA
);
1434 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1437 if (sb_any_quota_loaded(sb
)) {
1438 printk(KERN_ERR
"EXT4-fs: Cannot change quota "
1439 "options when quota turned on.\n");
1442 clear_opt(sbi
->s_mount_opt
, QUOTA
);
1443 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1444 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1451 "EXT4-fs: quota options not supported.\n");
1455 case Opt_offusrjquota
:
1456 case Opt_offgrpjquota
:
1457 case Opt_jqfmt_vfsold
:
1458 case Opt_jqfmt_vfsv0
:
1460 "EXT4-fs: journaled quota options not "
1467 set_opt(sbi
->s_mount_opt
, ABORT
);
1470 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1473 if (match_int(&args
[0], &option
)) {
1474 set_opt(sbi
->s_mount_opt
, BARRIER
);
1478 set_opt(sbi
->s_mount_opt
, BARRIER
);
1480 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1486 printk("EXT4-fs: resize option only available "
1490 if (match_int(&args
[0], &option
) != 0)
1492 *n_blocks_count
= option
;
1495 set_opt(sbi
->s_mount_opt
, NOBH
);
1498 clear_opt(sbi
->s_mount_opt
, NOBH
);
1501 set_opt(sbi
->s_mount_opt
, I_VERSION
);
1502 sb
->s_flags
|= MS_I_VERSION
;
1504 case Opt_nodelalloc
:
1505 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
1508 if (match_int(&args
[0], &option
))
1512 sbi
->s_stripe
= option
;
1515 set_opt(sbi
->s_mount_opt
, DELALLOC
);
1517 case Opt_block_validity
:
1518 set_opt(sbi
->s_mount_opt
, BLOCK_VALIDITY
);
1520 case Opt_noblock_validity
:
1521 clear_opt(sbi
->s_mount_opt
, BLOCK_VALIDITY
);
1523 case Opt_inode_readahead_blks
:
1524 if (match_int(&args
[0], &option
))
1526 if (option
< 0 || option
> (1 << 30))
1528 if (!is_power_of_2(option
)) {
1529 printk(KERN_ERR
"EXT4-fs: inode_readahead_blks"
1530 " must be a power of 2\n");
1533 sbi
->s_inode_readahead_blks
= option
;
1535 case Opt_journal_ioprio
:
1536 if (match_int(&args
[0], &option
))
1538 if (option
< 0 || option
> 7)
1540 *journal_ioprio
= IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
,
1543 case Opt_noauto_da_alloc
:
1544 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1546 case Opt_auto_da_alloc
:
1547 if (match_int(&args
[0], &option
)) {
1548 clear_opt(sbi
->s_mount_opt
, NO_AUTO_DA_ALLOC
);
1552 clear_opt(sbi
->s_mount_opt
, NO_AUTO_DA_ALLOC
);
1554 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1558 "EXT4-fs: Unrecognized mount option \"%s\" "
1559 "or missing value\n", p
);
1564 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1565 if ((sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
) &&
1566 sbi
->s_qf_names
[USRQUOTA
])
1567 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1569 if ((sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
) &&
1570 sbi
->s_qf_names
[GRPQUOTA
])
1571 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1573 if ((sbi
->s_qf_names
[USRQUOTA
] &&
1574 (sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
)) ||
1575 (sbi
->s_qf_names
[GRPQUOTA
] &&
1576 (sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
))) {
1577 printk(KERN_ERR
"EXT4-fs: old and new quota "
1578 "format mixing.\n");
1582 if (!sbi
->s_jquota_fmt
) {
1583 printk(KERN_ERR
"EXT4-fs: journaled quota format "
1584 "not specified.\n");
1588 if (sbi
->s_jquota_fmt
) {
1589 printk(KERN_ERR
"EXT4-fs: journaled quota format "
1590 "specified with no journaling "
1599 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1602 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1605 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1606 printk(KERN_ERR
"EXT4-fs warning: revision level too high, "
1607 "forcing read-only mode\n");
1612 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1613 printk(KERN_WARNING
"EXT4-fs warning: mounting unchecked fs, "
1614 "running e2fsck is recommended\n");
1615 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1617 "EXT4-fs warning: mounting fs with errors, "
1618 "running e2fsck is recommended\n");
1619 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
1620 le16_to_cpu(es
->s_mnt_count
) >=
1621 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1623 "EXT4-fs warning: maximal mount count reached, "
1624 "running e2fsck is recommended\n");
1625 else if (le32_to_cpu(es
->s_checkinterval
) &&
1626 (le32_to_cpu(es
->s_lastcheck
) +
1627 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1629 "EXT4-fs warning: checktime reached, "
1630 "running e2fsck is recommended\n");
1631 if (!sbi
->s_journal
)
1632 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1633 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1634 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1635 le16_add_cpu(&es
->s_mnt_count
, 1);
1636 es
->s_mtime
= cpu_to_le32(get_seconds());
1637 ext4_update_dynamic_rev(sb
);
1639 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1641 ext4_commit_super(sb
, 1);
1642 if (test_opt(sb
, DEBUG
))
1643 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
1644 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1646 sbi
->s_groups_count
,
1647 EXT4_BLOCKS_PER_GROUP(sb
),
1648 EXT4_INODES_PER_GROUP(sb
),
1651 if (EXT4_SB(sb
)->s_journal
) {
1652 printk(KERN_INFO
"EXT4 FS on %s, %s journal on %s\n",
1653 sb
->s_id
, EXT4_SB(sb
)->s_journal
->j_inode
? "internal" :
1654 "external", EXT4_SB(sb
)->s_journal
->j_devname
);
1656 printk(KERN_INFO
"EXT4 FS on %s, no journal\n", sb
->s_id
);
1661 static int ext4_fill_flex_info(struct super_block
*sb
)
1663 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1664 struct ext4_group_desc
*gdp
= NULL
;
1665 ext4_group_t flex_group_count
;
1666 ext4_group_t flex_group
;
1667 int groups_per_flex
= 0;
1671 if (!sbi
->s_es
->s_log_groups_per_flex
) {
1672 sbi
->s_log_groups_per_flex
= 0;
1676 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1677 groups_per_flex
= 1 << sbi
->s_log_groups_per_flex
;
1679 /* We allocate both existing and potentially added groups */
1680 flex_group_count
= ((sbi
->s_groups_count
+ groups_per_flex
- 1) +
1681 ((le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
) + 1) <<
1682 EXT4_DESC_PER_BLOCK_BITS(sb
))) / groups_per_flex
;
1683 size
= flex_group_count
* sizeof(struct flex_groups
);
1684 sbi
->s_flex_groups
= kzalloc(size
, GFP_KERNEL
);
1685 if (sbi
->s_flex_groups
== NULL
) {
1686 sbi
->s_flex_groups
= vmalloc(size
);
1687 if (sbi
->s_flex_groups
)
1688 memset(sbi
->s_flex_groups
, 0, size
);
1690 if (sbi
->s_flex_groups
== NULL
) {
1691 printk(KERN_ERR
"EXT4-fs: not enough memory for "
1692 "%u flex groups\n", flex_group_count
);
1696 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1697 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1699 flex_group
= ext4_flex_group(sbi
, i
);
1700 atomic_set(&sbi
->s_flex_groups
[flex_group
].free_inodes
,
1701 ext4_free_inodes_count(sb
, gdp
));
1702 atomic_set(&sbi
->s_flex_groups
[flex_group
].free_blocks
,
1703 ext4_free_blks_count(sb
, gdp
));
1704 atomic_set(&sbi
->s_flex_groups
[flex_group
].used_dirs
,
1705 ext4_used_dirs_count(sb
, gdp
));
1713 __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
1714 struct ext4_group_desc
*gdp
)
1718 if (sbi
->s_es
->s_feature_ro_compat
&
1719 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) {
1720 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
1721 __le32 le_group
= cpu_to_le32(block_group
);
1723 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
1724 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
1725 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
1726 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
1727 /* for checksum of struct ext4_group_desc do the rest...*/
1728 if ((sbi
->s_es
->s_feature_incompat
&
1729 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
1730 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
1731 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
1732 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
1736 return cpu_to_le16(crc
);
1739 int ext4_group_desc_csum_verify(struct ext4_sb_info
*sbi
, __u32 block_group
,
1740 struct ext4_group_desc
*gdp
)
1742 if ((sbi
->s_es
->s_feature_ro_compat
&
1743 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) &&
1744 (gdp
->bg_checksum
!= ext4_group_desc_csum(sbi
, block_group
, gdp
)))
1750 /* Called at mount-time, super-block is locked */
1751 static int ext4_check_descriptors(struct super_block
*sb
)
1753 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1754 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
1755 ext4_fsblk_t last_block
;
1756 ext4_fsblk_t block_bitmap
;
1757 ext4_fsblk_t inode_bitmap
;
1758 ext4_fsblk_t inode_table
;
1759 int flexbg_flag
= 0;
1762 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
1765 ext4_debug("Checking group descriptors");
1767 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1768 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1770 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
1771 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
1773 last_block
= first_block
+
1774 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
1776 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
1777 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
1778 printk(KERN_ERR
"EXT4-fs: ext4_check_descriptors: "
1779 "Block bitmap for group %u not in group "
1780 "(block %llu)!\n", i
, block_bitmap
);
1783 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
1784 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
1785 printk(KERN_ERR
"EXT4-fs: ext4_check_descriptors: "
1786 "Inode bitmap for group %u not in group "
1787 "(block %llu)!\n", i
, inode_bitmap
);
1790 inode_table
= ext4_inode_table(sb
, gdp
);
1791 if (inode_table
< first_block
||
1792 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
1793 printk(KERN_ERR
"EXT4-fs: ext4_check_descriptors: "
1794 "Inode table for group %u not in group "
1795 "(block %llu)!\n", i
, inode_table
);
1798 ext4_lock_group(sb
, i
);
1799 if (!ext4_group_desc_csum_verify(sbi
, i
, gdp
)) {
1800 printk(KERN_ERR
"EXT4-fs: ext4_check_descriptors: "
1801 "Checksum for group %u failed (%u!=%u)\n",
1802 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
1803 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
1804 if (!(sb
->s_flags
& MS_RDONLY
)) {
1805 ext4_unlock_group(sb
, i
);
1809 ext4_unlock_group(sb
, i
);
1811 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
1814 ext4_free_blocks_count_set(sbi
->s_es
, ext4_count_free_blocks(sb
));
1815 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
1819 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1820 * the superblock) which were deleted from all directories, but held open by
1821 * a process at the time of a crash. We walk the list and try to delete these
1822 * inodes at recovery time (only with a read-write filesystem).
1824 * In order to keep the orphan inode chain consistent during traversal (in
1825 * case of crash during recovery), we link each inode into the superblock
1826 * orphan list_head and handle it the same way as an inode deletion during
1827 * normal operation (which journals the operations for us).
1829 * We only do an iget() and an iput() on each inode, which is very safe if we
1830 * accidentally point at an in-use or already deleted inode. The worst that
1831 * can happen in this case is that we get a "bit already cleared" message from
1832 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1833 * e2fsck was run on this filesystem, and it must have already done the orphan
1834 * inode cleanup for us, so we can safely abort without any further action.
1836 static void ext4_orphan_cleanup(struct super_block
*sb
,
1837 struct ext4_super_block
*es
)
1839 unsigned int s_flags
= sb
->s_flags
;
1840 int nr_orphans
= 0, nr_truncates
= 0;
1844 if (!es
->s_last_orphan
) {
1845 jbd_debug(4, "no orphan inodes to clean up\n");
1849 if (bdev_read_only(sb
->s_bdev
)) {
1850 printk(KERN_ERR
"EXT4-fs: write access "
1851 "unavailable, skipping orphan cleanup.\n");
1855 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
1856 if (es
->s_last_orphan
)
1857 jbd_debug(1, "Errors on filesystem, "
1858 "clearing orphan list.\n");
1859 es
->s_last_orphan
= 0;
1860 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1864 if (s_flags
& MS_RDONLY
) {
1865 printk(KERN_INFO
"EXT4-fs: %s: orphan cleanup on readonly fs\n",
1867 sb
->s_flags
&= ~MS_RDONLY
;
1870 /* Needed for iput() to work correctly and not trash data */
1871 sb
->s_flags
|= MS_ACTIVE
;
1872 /* Turn on quotas so that they are updated correctly */
1873 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1874 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
1875 int ret
= ext4_quota_on_mount(sb
, i
);
1878 "EXT4-fs: Cannot turn on journaled "
1879 "quota: error %d\n", ret
);
1884 while (es
->s_last_orphan
) {
1885 struct inode
*inode
;
1887 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
1888 if (IS_ERR(inode
)) {
1889 es
->s_last_orphan
= 0;
1893 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
1895 if (inode
->i_nlink
) {
1897 "%s: truncating inode %lu to %lld bytes\n",
1898 __func__
, inode
->i_ino
, inode
->i_size
);
1899 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
1900 inode
->i_ino
, inode
->i_size
);
1901 ext4_truncate(inode
);
1905 "%s: deleting unreferenced inode %lu\n",
1906 __func__
, inode
->i_ino
);
1907 jbd_debug(2, "deleting unreferenced inode %lu\n",
1911 iput(inode
); /* The delete magic happens here! */
1914 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
1917 printk(KERN_INFO
"EXT4-fs: %s: %d orphan inode%s deleted\n",
1918 sb
->s_id
, PLURAL(nr_orphans
));
1920 printk(KERN_INFO
"EXT4-fs: %s: %d truncate%s cleaned up\n",
1921 sb
->s_id
, PLURAL(nr_truncates
));
1923 /* Turn quotas off */
1924 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1925 if (sb_dqopt(sb
)->files
[i
])
1926 vfs_quota_off(sb
, i
, 0);
1929 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
1933 * Maximal extent format file size.
1934 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1935 * extent format containers, within a sector_t, and within i_blocks
1936 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1937 * so that won't be a limiting factor.
1939 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1941 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
1944 loff_t upper_limit
= MAX_LFS_FILESIZE
;
1946 /* small i_blocks in vfs inode? */
1947 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
1949 * CONFIG_LBD is not enabled implies the inode
1950 * i_block represent total blocks in 512 bytes
1951 * 32 == size of vfs inode i_blocks * 8
1953 upper_limit
= (1LL << 32) - 1;
1955 /* total blocks in file system block size */
1956 upper_limit
>>= (blkbits
- 9);
1957 upper_limit
<<= blkbits
;
1960 /* 32-bit extent-start container, ee_block */
1965 /* Sanity check against vm- & vfs- imposed limits */
1966 if (res
> upper_limit
)
1973 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
1974 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1975 * We need to be 1 filesystem block less than the 2^48 sector limit.
1977 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
1979 loff_t res
= EXT4_NDIR_BLOCKS
;
1982 /* This is calculated to be the largest file size for a dense, block
1983 * mapped file such that the file's total number of 512-byte sectors,
1984 * including data and all indirect blocks, does not exceed (2^48 - 1).
1986 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
1987 * number of 512-byte sectors of the file.
1990 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
1992 * !has_huge_files or CONFIG_LBD not enabled implies that
1993 * the inode i_block field represents total file blocks in
1994 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
1996 upper_limit
= (1LL << 32) - 1;
1998 /* total blocks in file system block size */
1999 upper_limit
>>= (bits
- 9);
2003 * We use 48 bit ext4_inode i_blocks
2004 * With EXT4_HUGE_FILE_FL set the i_blocks
2005 * represent total number of blocks in
2006 * file system block size
2008 upper_limit
= (1LL << 48) - 1;
2012 /* indirect blocks */
2014 /* double indirect blocks */
2015 meta_blocks
+= 1 + (1LL << (bits
-2));
2016 /* tripple indirect blocks */
2017 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2019 upper_limit
-= meta_blocks
;
2020 upper_limit
<<= bits
;
2022 res
+= 1LL << (bits
-2);
2023 res
+= 1LL << (2*(bits
-2));
2024 res
+= 1LL << (3*(bits
-2));
2026 if (res
> upper_limit
)
2029 if (res
> MAX_LFS_FILESIZE
)
2030 res
= MAX_LFS_FILESIZE
;
2035 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2036 ext4_fsblk_t logical_sb_block
, int nr
)
2038 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2039 ext4_group_t bg
, first_meta_bg
;
2042 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2044 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
2046 return logical_sb_block
+ nr
+ 1;
2047 bg
= sbi
->s_desc_per_block
* nr
;
2048 if (ext4_bg_has_super(sb
, bg
))
2051 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2055 * ext4_get_stripe_size: Get the stripe size.
2056 * @sbi: In memory super block info
2058 * If we have specified it via mount option, then
2059 * use the mount option value. If the value specified at mount time is
2060 * greater than the blocks per group use the super block value.
2061 * If the super block value is greater than blocks per group return 0.
2062 * Allocator needs it be less than blocks per group.
2065 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2067 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2068 unsigned long stripe_width
=
2069 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2071 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2072 return sbi
->s_stripe
;
2074 if (stripe_width
<= sbi
->s_blocks_per_group
)
2075 return stripe_width
;
2077 if (stride
<= sbi
->s_blocks_per_group
)
2086 struct attribute attr
;
2087 ssize_t (*show
)(struct ext4_attr
*, struct ext4_sb_info
*, char *);
2088 ssize_t (*store
)(struct ext4_attr
*, struct ext4_sb_info
*,
2089 const char *, size_t);
2093 static int parse_strtoul(const char *buf
,
2094 unsigned long max
, unsigned long *value
)
2098 while (*buf
&& isspace(*buf
))
2100 *value
= simple_strtoul(buf
, &endp
, 0);
2101 while (*endp
&& isspace(*endp
))
2103 if (*endp
|| *value
> max
)
2109 static ssize_t
delayed_allocation_blocks_show(struct ext4_attr
*a
,
2110 struct ext4_sb_info
*sbi
,
2113 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2114 (s64
) percpu_counter_sum(&sbi
->s_dirtyblocks_counter
));
2117 static ssize_t
session_write_kbytes_show(struct ext4_attr
*a
,
2118 struct ext4_sb_info
*sbi
, char *buf
)
2120 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2122 return snprintf(buf
, PAGE_SIZE
, "%lu\n",
2123 (part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2124 sbi
->s_sectors_written_start
) >> 1);
2127 static ssize_t
lifetime_write_kbytes_show(struct ext4_attr
*a
,
2128 struct ext4_sb_info
*sbi
, char *buf
)
2130 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2132 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2133 sbi
->s_kbytes_written
+
2134 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2135 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
2138 static ssize_t
inode_readahead_blks_store(struct ext4_attr
*a
,
2139 struct ext4_sb_info
*sbi
,
2140 const char *buf
, size_t count
)
2144 if (parse_strtoul(buf
, 0x40000000, &t
))
2147 if (!is_power_of_2(t
))
2150 sbi
->s_inode_readahead_blks
= t
;
2154 static ssize_t
sbi_ui_show(struct ext4_attr
*a
,
2155 struct ext4_sb_info
*sbi
, char *buf
)
2157 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2159 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
2162 static ssize_t
sbi_ui_store(struct ext4_attr
*a
,
2163 struct ext4_sb_info
*sbi
,
2164 const char *buf
, size_t count
)
2166 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2169 if (parse_strtoul(buf
, 0xffffffff, &t
))
2175 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2176 static struct ext4_attr ext4_attr_##_name = { \
2177 .attr = {.name = __stringify(_name), .mode = _mode }, \
2180 .offset = offsetof(struct ext4_sb_info, _elname), \
2182 #define EXT4_ATTR(name, mode, show, store) \
2183 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2185 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2186 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2187 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2188 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2189 #define ATTR_LIST(name) &ext4_attr_##name.attr
2191 EXT4_RO_ATTR(delayed_allocation_blocks
);
2192 EXT4_RO_ATTR(session_write_kbytes
);
2193 EXT4_RO_ATTR(lifetime_write_kbytes
);
2194 EXT4_ATTR_OFFSET(inode_readahead_blks
, 0644, sbi_ui_show
,
2195 inode_readahead_blks_store
, s_inode_readahead_blks
);
2196 EXT4_RW_ATTR_SBI_UI(mb_stats
, s_mb_stats
);
2197 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan
, s_mb_max_to_scan
);
2198 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan
, s_mb_min_to_scan
);
2199 EXT4_RW_ATTR_SBI_UI(mb_order2_req
, s_mb_order2_reqs
);
2200 EXT4_RW_ATTR_SBI_UI(mb_stream_req
, s_mb_stream_request
);
2201 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc
, s_mb_group_prealloc
);
2203 static struct attribute
*ext4_attrs
[] = {
2204 ATTR_LIST(delayed_allocation_blocks
),
2205 ATTR_LIST(session_write_kbytes
),
2206 ATTR_LIST(lifetime_write_kbytes
),
2207 ATTR_LIST(inode_readahead_blks
),
2208 ATTR_LIST(mb_stats
),
2209 ATTR_LIST(mb_max_to_scan
),
2210 ATTR_LIST(mb_min_to_scan
),
2211 ATTR_LIST(mb_order2_req
),
2212 ATTR_LIST(mb_stream_req
),
2213 ATTR_LIST(mb_group_prealloc
),
2217 static ssize_t
ext4_attr_show(struct kobject
*kobj
,
2218 struct attribute
*attr
, char *buf
)
2220 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2222 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2224 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
2227 static ssize_t
ext4_attr_store(struct kobject
*kobj
,
2228 struct attribute
*attr
,
2229 const char *buf
, size_t len
)
2231 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2233 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2235 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
2238 static void ext4_sb_release(struct kobject
*kobj
)
2240 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2242 complete(&sbi
->s_kobj_unregister
);
2246 static struct sysfs_ops ext4_attr_ops
= {
2247 .show
= ext4_attr_show
,
2248 .store
= ext4_attr_store
,
2251 static struct kobj_type ext4_ktype
= {
2252 .default_attrs
= ext4_attrs
,
2253 .sysfs_ops
= &ext4_attr_ops
,
2254 .release
= ext4_sb_release
,
2257 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
2258 __releases(kernel_lock
)
2259 __acquires(kernel_lock
)
2261 struct buffer_head
*bh
;
2262 struct ext4_super_block
*es
= NULL
;
2263 struct ext4_sb_info
*sbi
;
2265 ext4_fsblk_t sb_block
= get_sb_block(&data
);
2266 ext4_fsblk_t logical_sb_block
;
2267 unsigned long offset
= 0;
2268 unsigned long journal_devnum
= 0;
2269 unsigned long def_mount_opts
;
2275 unsigned int db_count
;
2277 int needs_recovery
, has_huge_files
;
2281 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
2283 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
2287 sbi
->s_blockgroup_lock
=
2288 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
2289 if (!sbi
->s_blockgroup_lock
) {
2293 sb
->s_fs_info
= sbi
;
2294 sbi
->s_mount_opt
= 0;
2295 sbi
->s_resuid
= EXT4_DEF_RESUID
;
2296 sbi
->s_resgid
= EXT4_DEF_RESGID
;
2297 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
2298 sbi
->s_sb_block
= sb_block
;
2299 sbi
->s_sectors_written_start
= part_stat_read(sb
->s_bdev
->bd_part
,
2304 /* Cleanup superblock name */
2305 for (cp
= sb
->s_id
; (cp
= strchr(cp
, '/'));)
2308 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
2310 printk(KERN_ERR
"EXT4-fs: unable to set blocksize\n");
2315 * The ext4 superblock will not be buffer aligned for other than 1kB
2316 * block sizes. We need to calculate the offset from buffer start.
2318 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
2319 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2320 offset
= do_div(logical_sb_block
, blocksize
);
2322 logical_sb_block
= sb_block
;
2325 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
2326 printk(KERN_ERR
"EXT4-fs: unable to read superblock\n");
2330 * Note: s_es must be initialized as soon as possible because
2331 * some ext4 macro-instructions depend on its value
2333 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
2335 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
2336 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
2338 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
2340 /* Set defaults before we parse the mount options */
2341 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
2342 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
2343 set_opt(sbi
->s_mount_opt
, DEBUG
);
2344 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
2345 set_opt(sbi
->s_mount_opt
, GRPID
);
2346 if (def_mount_opts
& EXT4_DEFM_UID16
)
2347 set_opt(sbi
->s_mount_opt
, NO_UID32
);
2348 #ifdef CONFIG_EXT4_FS_XATTR
2349 if (def_mount_opts
& EXT4_DEFM_XATTR_USER
)
2350 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
2352 #ifdef CONFIG_EXT4_FS_POSIX_ACL
2353 if (def_mount_opts
& EXT4_DEFM_ACL
)
2354 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
2356 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
2357 sbi
->s_mount_opt
|= EXT4_MOUNT_JOURNAL_DATA
;
2358 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
2359 sbi
->s_mount_opt
|= EXT4_MOUNT_ORDERED_DATA
;
2360 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
2361 sbi
->s_mount_opt
|= EXT4_MOUNT_WRITEBACK_DATA
;
2363 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
2364 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
2365 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
2366 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
2368 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
2370 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
2371 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
2372 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
2373 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
2374 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
2375 sbi
->s_mb_history_max
= default_mb_history_length
;
2377 set_opt(sbi
->s_mount_opt
, BARRIER
);
2380 * enable delayed allocation by default
2381 * Use -o nodelalloc to turn it off
2383 set_opt(sbi
->s_mount_opt
, DELALLOC
);
2385 if (!parse_options((char *) data
, sb
, &journal_devnum
,
2386 &journal_ioprio
, NULL
, 0))
2389 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
2390 ((sbi
->s_mount_opt
& EXT4_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
2392 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
2393 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
2394 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
2395 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
2397 "EXT4-fs warning: feature flags set on rev 0 fs, "
2398 "running e2fsck is recommended\n");
2401 * Check feature flags regardless of the revision level, since we
2402 * previously didn't change the revision level when setting the flags,
2403 * so there is a chance incompat flags are set on a rev 0 filesystem.
2405 features
= EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
);
2407 printk(KERN_ERR
"EXT4-fs: %s: couldn't mount because of "
2408 "unsupported optional features (%x).\n", sb
->s_id
,
2409 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2410 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2413 features
= EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
);
2414 if (!(sb
->s_flags
& MS_RDONLY
) && features
) {
2415 printk(KERN_ERR
"EXT4-fs: %s: couldn't mount RDWR because of "
2416 "unsupported optional features (%x).\n", sb
->s_id
,
2417 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2418 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2421 has_huge_files
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2422 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
);
2423 if (has_huge_files
) {
2425 * Large file size enabled file system can only be
2426 * mount if kernel is build with CONFIG_LBD
2428 if (sizeof(root
->i_blocks
) < sizeof(u64
) &&
2429 !(sb
->s_flags
& MS_RDONLY
)) {
2430 printk(KERN_ERR
"EXT4-fs: %s: Filesystem with huge "
2431 "files cannot be mounted read-write "
2432 "without CONFIG_LBD.\n", sb
->s_id
);
2436 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
2438 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
2439 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
2441 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
2442 blocksize
, sb
->s_id
);
2446 if (sb
->s_blocksize
!= blocksize
) {
2447 /* Validate the filesystem blocksize */
2448 if (!sb_set_blocksize(sb
, blocksize
)) {
2449 printk(KERN_ERR
"EXT4-fs: bad block size %d.\n",
2455 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2456 offset
= do_div(logical_sb_block
, blocksize
);
2457 bh
= sb_bread(sb
, logical_sb_block
);
2460 "EXT4-fs: Can't read superblock on 2nd try.\n");
2463 es
= (struct ext4_super_block
*)(((char *)bh
->b_data
) + offset
);
2465 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
2467 "EXT4-fs: Magic mismatch, very weird !\n");
2472 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
2474 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
2476 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
2477 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
2478 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
2480 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
2481 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
2482 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
2483 (!is_power_of_2(sbi
->s_inode_size
)) ||
2484 (sbi
->s_inode_size
> blocksize
)) {
2486 "EXT4-fs: unsupported inode size: %d\n",
2490 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
2491 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
2494 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
2495 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
2496 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
2497 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
2498 !is_power_of_2(sbi
->s_desc_size
)) {
2500 "EXT4-fs: unsupported descriptor size %lu\n",
2505 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
2507 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
2508 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
2509 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
2512 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
2513 if (sbi
->s_inodes_per_block
== 0)
2515 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
2516 sbi
->s_inodes_per_block
;
2517 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
2519 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
2520 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
2521 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
2523 for (i
= 0; i
< 4; i
++)
2524 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
2525 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
2526 i
= le32_to_cpu(es
->s_flags
);
2527 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
2528 sbi
->s_hash_unsigned
= 3;
2529 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
2530 #ifdef __CHAR_UNSIGNED__
2531 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
2532 sbi
->s_hash_unsigned
= 3;
2534 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
2539 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
2541 "EXT4-fs: #blocks per group too big: %lu\n",
2542 sbi
->s_blocks_per_group
);
2545 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
2547 "EXT4-fs: #inodes per group too big: %lu\n",
2548 sbi
->s_inodes_per_group
);
2552 if (ext4_blocks_count(es
) >
2553 (sector_t
)(~0ULL) >> (sb
->s_blocksize_bits
- 9)) {
2554 printk(KERN_ERR
"EXT4-fs: filesystem on %s:"
2555 " too large to mount safely\n", sb
->s_id
);
2556 if (sizeof(sector_t
) < 8)
2557 printk(KERN_WARNING
"EXT4-fs: CONFIG_LBD not "
2562 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
2565 /* check blocks count against device size */
2566 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
2567 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
2568 printk(KERN_WARNING
"EXT4-fs: bad geometry: block count %llu "
2569 "exceeds size of device (%llu blocks)\n",
2570 ext4_blocks_count(es
), blocks_count
);
2575 * It makes no sense for the first data block to be beyond the end
2576 * of the filesystem.
2578 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
2579 printk(KERN_WARNING
"EXT4-fs: bad geometry: first data"
2580 "block %u is beyond end of filesystem (%llu)\n",
2581 le32_to_cpu(es
->s_first_data_block
),
2582 ext4_blocks_count(es
));
2585 blocks_count
= (ext4_blocks_count(es
) -
2586 le32_to_cpu(es
->s_first_data_block
) +
2587 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2588 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
2589 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
2590 printk(KERN_WARNING
"EXT4-fs: groups count too large: %u "
2591 "(block count %llu, first data block %u, "
2592 "blocks per group %lu)\n", sbi
->s_groups_count
,
2593 ext4_blocks_count(es
),
2594 le32_to_cpu(es
->s_first_data_block
),
2595 EXT4_BLOCKS_PER_GROUP(sb
));
2598 sbi
->s_groups_count
= blocks_count
;
2599 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
2600 EXT4_DESC_PER_BLOCK(sb
);
2601 sbi
->s_group_desc
= kmalloc(db_count
* sizeof(struct buffer_head
*),
2603 if (sbi
->s_group_desc
== NULL
) {
2604 printk(KERN_ERR
"EXT4-fs: not enough memory\n");
2608 #ifdef CONFIG_PROC_FS
2610 sbi
->s_proc
= proc_mkdir(sb
->s_id
, ext4_proc_root
);
2613 bgl_lock_init(sbi
->s_blockgroup_lock
);
2615 for (i
= 0; i
< db_count
; i
++) {
2616 block
= descriptor_loc(sb
, logical_sb_block
, i
);
2617 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
2618 if (!sbi
->s_group_desc
[i
]) {
2619 printk(KERN_ERR
"EXT4-fs: "
2620 "can't read group descriptor %d\n", i
);
2625 if (!ext4_check_descriptors(sb
)) {
2626 printk(KERN_ERR
"EXT4-fs: group descriptors corrupted!\n");
2629 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
2630 if (!ext4_fill_flex_info(sb
)) {
2632 "EXT4-fs: unable to initialize "
2633 "flex_bg meta info!\n");
2637 sbi
->s_gdb_count
= db_count
;
2638 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
2639 spin_lock_init(&sbi
->s_next_gen_lock
);
2641 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
2642 ext4_count_free_blocks(sb
));
2644 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
2645 ext4_count_free_inodes(sb
));
2648 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
2649 ext4_count_dirs(sb
));
2652 err
= percpu_counter_init(&sbi
->s_dirtyblocks_counter
, 0);
2655 printk(KERN_ERR
"EXT4-fs: insufficient memory\n");
2659 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
2662 * set up enough so that it can read an inode
2664 if (!test_opt(sb
, NOLOAD
) &&
2665 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
2666 sb
->s_op
= &ext4_sops
;
2668 sb
->s_op
= &ext4_nojournal_sops
;
2669 sb
->s_export_op
= &ext4_export_ops
;
2670 sb
->s_xattr
= ext4_xattr_handlers
;
2672 sb
->s_qcop
= &ext4_qctl_operations
;
2673 sb
->dq_op
= &ext4_quota_operations
;
2675 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
2676 mutex_init(&sbi
->s_orphan_lock
);
2677 mutex_init(&sbi
->s_resize_lock
);
2681 needs_recovery
= (es
->s_last_orphan
!= 0 ||
2682 EXT4_HAS_INCOMPAT_FEATURE(sb
,
2683 EXT4_FEATURE_INCOMPAT_RECOVER
));
2686 * The first inode we look at is the journal inode. Don't try
2687 * root first: it may be modified in the journal!
2689 if (!test_opt(sb
, NOLOAD
) &&
2690 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
2691 if (ext4_load_journal(sb
, es
, journal_devnum
))
2693 if (!(sb
->s_flags
& MS_RDONLY
) &&
2694 EXT4_SB(sb
)->s_journal
->j_failed_commit
) {
2695 printk(KERN_CRIT
"EXT4-fs error (device %s): "
2696 "ext4_fill_super: Journal transaction "
2697 "%u is corrupt\n", sb
->s_id
,
2698 EXT4_SB(sb
)->s_journal
->j_failed_commit
);
2699 if (test_opt(sb
, ERRORS_RO
)) {
2701 "Mounting filesystem read-only\n");
2702 sb
->s_flags
|= MS_RDONLY
;
2703 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
2704 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
2706 if (test_opt(sb
, ERRORS_PANIC
)) {
2707 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
2708 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
2709 ext4_commit_super(sb
, 1);
2713 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
2714 EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
2715 printk(KERN_ERR
"EXT4-fs: required journal recovery "
2716 "suppressed and not mounted read-only\n");
2719 clear_opt(sbi
->s_mount_opt
, DATA_FLAGS
);
2720 set_opt(sbi
->s_mount_opt
, WRITEBACK_DATA
);
2721 sbi
->s_journal
= NULL
;
2726 if (ext4_blocks_count(es
) > 0xffffffffULL
&&
2727 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
2728 JBD2_FEATURE_INCOMPAT_64BIT
)) {
2729 printk(KERN_ERR
"EXT4-fs: Failed to set 64-bit journal feature\n");
2733 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
2734 jbd2_journal_set_features(sbi
->s_journal
,
2735 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2736 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2737 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
2738 jbd2_journal_set_features(sbi
->s_journal
,
2739 JBD2_FEATURE_COMPAT_CHECKSUM
, 0, 0);
2740 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
2741 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2743 jbd2_journal_clear_features(sbi
->s_journal
,
2744 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2745 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2748 /* We have now updated the journal if required, so we can
2749 * validate the data journaling mode. */
2750 switch (test_opt(sb
, DATA_FLAGS
)) {
2752 /* No mode set, assume a default based on the journal
2753 * capabilities: ORDERED_DATA if the journal can
2754 * cope, else JOURNAL_DATA
2756 if (jbd2_journal_check_available_features
2757 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
2758 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
2760 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
2763 case EXT4_MOUNT_ORDERED_DATA
:
2764 case EXT4_MOUNT_WRITEBACK_DATA
:
2765 if (!jbd2_journal_check_available_features
2766 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
2767 printk(KERN_ERR
"EXT4-fs: Journal does not support "
2768 "requested data journaling mode\n");
2774 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
2778 if (test_opt(sb
, NOBH
)) {
2779 if (!(test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)) {
2780 printk(KERN_WARNING
"EXT4-fs: Ignoring nobh option - "
2781 "its supported only with writeback mode\n");
2782 clear_opt(sbi
->s_mount_opt
, NOBH
);
2786 * The jbd2_journal_load will have done any necessary log recovery,
2787 * so we can safely mount the rest of the filesystem now.
2790 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
2792 printk(KERN_ERR
"EXT4-fs: get root inode failed\n");
2793 ret
= PTR_ERR(root
);
2796 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
2798 printk(KERN_ERR
"EXT4-fs: corrupt root inode, run e2fsck\n");
2801 sb
->s_root
= d_alloc_root(root
);
2803 printk(KERN_ERR
"EXT4-fs: get root dentry failed\n");
2809 ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
);
2811 /* determine the minimum size of new large inodes, if present */
2812 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
2813 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2814 EXT4_GOOD_OLD_INODE_SIZE
;
2815 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2816 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
2817 if (sbi
->s_want_extra_isize
<
2818 le16_to_cpu(es
->s_want_extra_isize
))
2819 sbi
->s_want_extra_isize
=
2820 le16_to_cpu(es
->s_want_extra_isize
);
2821 if (sbi
->s_want_extra_isize
<
2822 le16_to_cpu(es
->s_min_extra_isize
))
2823 sbi
->s_want_extra_isize
=
2824 le16_to_cpu(es
->s_min_extra_isize
);
2827 /* Check if enough inode space is available */
2828 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
2829 sbi
->s_inode_size
) {
2830 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2831 EXT4_GOOD_OLD_INODE_SIZE
;
2832 printk(KERN_INFO
"EXT4-fs: required extra inode space not"
2836 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
2837 printk(KERN_WARNING
"EXT4-fs: Ignoring delalloc option - "
2838 "requested data journaling mode\n");
2839 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
2840 } else if (test_opt(sb
, DELALLOC
))
2841 printk(KERN_INFO
"EXT4-fs: delayed allocation enabled\n");
2843 err
= ext4_setup_system_zone(sb
);
2845 printk(KERN_ERR
"EXT4-fs: failed to initialize system "
2846 "zone (%d)\n", err
);
2851 err
= ext4_mb_init(sb
, needs_recovery
);
2853 printk(KERN_ERR
"EXT4-fs: failed to initalize mballoc (%d)\n",
2858 sbi
->s_kobj
.kset
= ext4_kset
;
2859 init_completion(&sbi
->s_kobj_unregister
);
2860 err
= kobject_init_and_add(&sbi
->s_kobj
, &ext4_ktype
, NULL
,
2863 ext4_mb_release(sb
);
2864 ext4_ext_release(sb
);
2868 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
2869 ext4_orphan_cleanup(sb
, es
);
2870 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
2871 if (needs_recovery
) {
2872 printk(KERN_INFO
"EXT4-fs: recovery complete.\n");
2873 ext4_mark_recovery_complete(sb
, es
);
2875 if (EXT4_SB(sb
)->s_journal
) {
2876 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
2877 descr
= " journalled data mode";
2878 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
2879 descr
= " ordered data mode";
2881 descr
= " writeback data mode";
2883 descr
= "out journal";
2885 printk(KERN_INFO
"EXT4-fs: mounted filesystem %s with%s\n",
2893 printk(KERN_ERR
"VFS: Can't find ext4 filesystem on dev %s.\n",
2898 printk(KERN_ERR
"EXT4-fs (device %s): mount failed\n", sb
->s_id
);
2899 ext4_release_system_zone(sb
);
2900 if (sbi
->s_journal
) {
2901 jbd2_journal_destroy(sbi
->s_journal
);
2902 sbi
->s_journal
= NULL
;
2905 if (sbi
->s_flex_groups
) {
2906 if (is_vmalloc_addr(sbi
->s_flex_groups
))
2907 vfree(sbi
->s_flex_groups
);
2909 kfree(sbi
->s_flex_groups
);
2911 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
2912 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
2913 percpu_counter_destroy(&sbi
->s_dirs_counter
);
2914 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
2916 for (i
= 0; i
< db_count
; i
++)
2917 brelse(sbi
->s_group_desc
[i
]);
2918 kfree(sbi
->s_group_desc
);
2921 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
2924 for (i
= 0; i
< MAXQUOTAS
; i
++)
2925 kfree(sbi
->s_qf_names
[i
]);
2927 ext4_blkdev_remove(sbi
);
2930 sb
->s_fs_info
= NULL
;
2931 kfree(sbi
->s_blockgroup_lock
);
2938 * Setup any per-fs journal parameters now. We'll do this both on
2939 * initial mount, once the journal has been initialised but before we've
2940 * done any recovery; and again on any subsequent remount.
2942 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
2944 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2946 journal
->j_commit_interval
= sbi
->s_commit_interval
;
2947 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
2948 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
2950 spin_lock(&journal
->j_state_lock
);
2951 if (test_opt(sb
, BARRIER
))
2952 journal
->j_flags
|= JBD2_BARRIER
;
2954 journal
->j_flags
&= ~JBD2_BARRIER
;
2955 if (test_opt(sb
, DATA_ERR_ABORT
))
2956 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
2958 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
2959 spin_unlock(&journal
->j_state_lock
);
2962 static journal_t
*ext4_get_journal(struct super_block
*sb
,
2963 unsigned int journal_inum
)
2965 struct inode
*journal_inode
;
2968 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
2970 /* First, test for the existence of a valid inode on disk. Bad
2971 * things happen if we iget() an unused inode, as the subsequent
2972 * iput() will try to delete it. */
2974 journal_inode
= ext4_iget(sb
, journal_inum
);
2975 if (IS_ERR(journal_inode
)) {
2976 printk(KERN_ERR
"EXT4-fs: no journal found.\n");
2979 if (!journal_inode
->i_nlink
) {
2980 make_bad_inode(journal_inode
);
2981 iput(journal_inode
);
2982 printk(KERN_ERR
"EXT4-fs: journal inode is deleted.\n");
2986 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
2987 journal_inode
, journal_inode
->i_size
);
2988 if (!S_ISREG(journal_inode
->i_mode
)) {
2989 printk(KERN_ERR
"EXT4-fs: invalid journal inode.\n");
2990 iput(journal_inode
);
2994 journal
= jbd2_journal_init_inode(journal_inode
);
2996 printk(KERN_ERR
"EXT4-fs: Could not load journal inode\n");
2997 iput(journal_inode
);
3000 journal
->j_private
= sb
;
3001 ext4_init_journal_params(sb
, journal
);
3005 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
3008 struct buffer_head
*bh
;
3012 int hblock
, blocksize
;
3013 ext4_fsblk_t sb_block
;
3014 unsigned long offset
;
3015 struct ext4_super_block
*es
;
3016 struct block_device
*bdev
;
3018 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3020 bdev
= ext4_blkdev_get(j_dev
);
3024 if (bd_claim(bdev
, sb
)) {
3026 "EXT4-fs: failed to claim external journal device.\n");
3027 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
3031 blocksize
= sb
->s_blocksize
;
3032 hblock
= bdev_hardsect_size(bdev
);
3033 if (blocksize
< hblock
) {
3035 "EXT4-fs: blocksize too small for journal device.\n");
3039 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
3040 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
3041 set_blocksize(bdev
, blocksize
);
3042 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
3043 printk(KERN_ERR
"EXT4-fs: couldn't read superblock of "
3044 "external journal\n");
3048 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
3049 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
3050 !(le32_to_cpu(es
->s_feature_incompat
) &
3051 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
3052 printk(KERN_ERR
"EXT4-fs: external journal has "
3053 "bad superblock\n");
3058 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
3059 printk(KERN_ERR
"EXT4-fs: journal UUID does not match\n");
3064 len
= ext4_blocks_count(es
);
3065 start
= sb_block
+ 1;
3066 brelse(bh
); /* we're done with the superblock */
3068 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
3069 start
, len
, blocksize
);
3071 printk(KERN_ERR
"EXT4-fs: failed to create device journal\n");
3074 journal
->j_private
= sb
;
3075 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
3076 wait_on_buffer(journal
->j_sb_buffer
);
3077 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
3078 printk(KERN_ERR
"EXT4-fs: I/O error on journal device\n");
3081 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
3082 printk(KERN_ERR
"EXT4-fs: External journal has more than one "
3083 "user (unsupported) - %d\n",
3084 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
3087 EXT4_SB(sb
)->journal_bdev
= bdev
;
3088 ext4_init_journal_params(sb
, journal
);
3092 jbd2_journal_destroy(journal
);
3094 ext4_blkdev_put(bdev
);
3098 static int ext4_load_journal(struct super_block
*sb
,
3099 struct ext4_super_block
*es
,
3100 unsigned long journal_devnum
)
3103 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
3106 int really_read_only
;
3108 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3110 if (journal_devnum
&&
3111 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3112 printk(KERN_INFO
"EXT4-fs: external journal device major/minor "
3113 "numbers have changed\n");
3114 journal_dev
= new_decode_dev(journal_devnum
);
3116 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
3118 really_read_only
= bdev_read_only(sb
->s_bdev
);
3121 * Are we loading a blank journal or performing recovery after a
3122 * crash? For recovery, we need to check in advance whether we
3123 * can get read-write access to the device.
3125 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3126 if (sb
->s_flags
& MS_RDONLY
) {
3127 printk(KERN_INFO
"EXT4-fs: INFO: recovery "
3128 "required on readonly filesystem.\n");
3129 if (really_read_only
) {
3130 printk(KERN_ERR
"EXT4-fs: write access "
3131 "unavailable, cannot proceed.\n");
3134 printk(KERN_INFO
"EXT4-fs: write access will "
3135 "be enabled during recovery.\n");
3139 if (journal_inum
&& journal_dev
) {
3140 printk(KERN_ERR
"EXT4-fs: filesystem has both journal "
3141 "and inode journals!\n");
3146 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
3149 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
3153 if (journal
->j_flags
& JBD2_BARRIER
)
3154 printk(KERN_INFO
"EXT4-fs: barriers enabled\n");
3156 printk(KERN_INFO
"EXT4-fs: barriers disabled\n");
3158 if (!really_read_only
&& test_opt(sb
, UPDATE_JOURNAL
)) {
3159 err
= jbd2_journal_update_format(journal
);
3161 printk(KERN_ERR
"EXT4-fs: error updating journal.\n");
3162 jbd2_journal_destroy(journal
);
3167 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
3168 err
= jbd2_journal_wipe(journal
, !really_read_only
);
3170 err
= jbd2_journal_load(journal
);
3173 printk(KERN_ERR
"EXT4-fs: error loading journal.\n");
3174 jbd2_journal_destroy(journal
);
3178 EXT4_SB(sb
)->s_journal
= journal
;
3179 ext4_clear_journal_err(sb
, es
);
3181 if (journal_devnum
&&
3182 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3183 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
3185 /* Make sure we flush the recovery flag to disk. */
3186 ext4_commit_super(sb
, 1);
3192 static int ext4_commit_super(struct super_block
*sb
, int sync
)
3194 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
3195 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
3200 if (buffer_write_io_error(sbh
)) {
3202 * Oh, dear. A previous attempt to write the
3203 * superblock failed. This could happen because the
3204 * USB device was yanked out. Or it could happen to
3205 * be a transient write error and maybe the block will
3206 * be remapped. Nothing we can do but to retry the
3207 * write and hope for the best.
3209 printk(KERN_ERR
"EXT4-fs: previous I/O error to "
3210 "superblock detected for %s.\n", sb
->s_id
);
3211 clear_buffer_write_io_error(sbh
);
3212 set_buffer_uptodate(sbh
);
3214 es
->s_wtime
= cpu_to_le32(get_seconds());
3215 es
->s_kbytes_written
=
3216 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
3217 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
3218 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
3219 ext4_free_blocks_count_set(es
, percpu_counter_sum_positive(
3220 &EXT4_SB(sb
)->s_freeblocks_counter
));
3221 es
->s_free_inodes_count
= cpu_to_le32(percpu_counter_sum_positive(
3222 &EXT4_SB(sb
)->s_freeinodes_counter
));
3224 BUFFER_TRACE(sbh
, "marking dirty");
3225 mark_buffer_dirty(sbh
);
3227 error
= sync_dirty_buffer(sbh
);
3231 error
= buffer_write_io_error(sbh
);
3233 printk(KERN_ERR
"EXT4-fs: I/O error while writing "
3234 "superblock for %s.\n", sb
->s_id
);
3235 clear_buffer_write_io_error(sbh
);
3236 set_buffer_uptodate(sbh
);
3243 * Have we just finished recovery? If so, and if we are mounting (or
3244 * remounting) the filesystem readonly, then we will end up with a
3245 * consistent fs on disk. Record that fact.
3247 static void ext4_mark_recovery_complete(struct super_block
*sb
,
3248 struct ext4_super_block
*es
)
3250 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
3252 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
3253 BUG_ON(journal
!= NULL
);
3256 jbd2_journal_lock_updates(journal
);
3257 if (jbd2_journal_flush(journal
) < 0)
3260 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
3261 sb
->s_flags
& MS_RDONLY
) {
3262 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3263 ext4_commit_super(sb
, 1);
3267 jbd2_journal_unlock_updates(journal
);
3271 * If we are mounting (or read-write remounting) a filesystem whose journal
3272 * has recorded an error from a previous lifetime, move that error to the
3273 * main filesystem now.
3275 static void ext4_clear_journal_err(struct super_block
*sb
,
3276 struct ext4_super_block
*es
)
3282 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3284 journal
= EXT4_SB(sb
)->s_journal
;
3287 * Now check for any error status which may have been recorded in the
3288 * journal by a prior ext4_error() or ext4_abort()
3291 j_errno
= jbd2_journal_errno(journal
);
3295 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
3296 ext4_warning(sb
, __func__
, "Filesystem error recorded "
3297 "from previous mount: %s", errstr
);
3298 ext4_warning(sb
, __func__
, "Marking fs in need of "
3299 "filesystem check.");
3301 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
3302 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
3303 ext4_commit_super(sb
, 1);
3305 jbd2_journal_clear_err(journal
);
3310 * Force the running and committing transactions to commit,
3311 * and wait on the commit.
3313 int ext4_force_commit(struct super_block
*sb
)
3318 if (sb
->s_flags
& MS_RDONLY
)
3321 journal
= EXT4_SB(sb
)->s_journal
;
3323 ret
= ext4_journal_force_commit(journal
);
3328 static void ext4_write_super(struct super_block
*sb
)
3330 ext4_commit_super(sb
, 1);
3333 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
3338 trace_mark(ext4_sync_fs
, "dev %s wait %d", sb
->s_id
, wait
);
3339 if (jbd2_journal_start_commit(EXT4_SB(sb
)->s_journal
, &target
)) {
3341 jbd2_log_wait_commit(EXT4_SB(sb
)->s_journal
, target
);
3347 * LVM calls this function before a (read-only) snapshot is created. This
3348 * gives us a chance to flush the journal completely and mark the fs clean.
3350 static int ext4_freeze(struct super_block
*sb
)
3355 if (sb
->s_flags
& MS_RDONLY
)
3358 journal
= EXT4_SB(sb
)->s_journal
;
3360 /* Now we set up the journal barrier. */
3361 jbd2_journal_lock_updates(journal
);
3364 * Don't clear the needs_recovery flag if we failed to flush
3367 error
= jbd2_journal_flush(journal
);
3370 jbd2_journal_unlock_updates(journal
);
3374 /* Journal blocked and flushed, clear needs_recovery flag. */
3375 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3376 error
= ext4_commit_super(sb
, 1);
3383 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3384 * flag here, even though the filesystem is not technically dirty yet.
3386 static int ext4_unfreeze(struct super_block
*sb
)
3388 if (sb
->s_flags
& MS_RDONLY
)
3392 /* Reset the needs_recovery flag before the fs is unlocked. */
3393 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3394 ext4_commit_super(sb
, 1);
3396 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
3400 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
3402 struct ext4_super_block
*es
;
3403 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3404 ext4_fsblk_t n_blocks_count
= 0;
3405 unsigned long old_sb_flags
;
3406 struct ext4_mount_options old_opts
;
3408 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3414 /* Store the original options */
3415 old_sb_flags
= sb
->s_flags
;
3416 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
3417 old_opts
.s_resuid
= sbi
->s_resuid
;
3418 old_opts
.s_resgid
= sbi
->s_resgid
;
3419 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
3420 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
3421 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
3423 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
3424 for (i
= 0; i
< MAXQUOTAS
; i
++)
3425 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
3427 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
3428 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
3431 * Allow the "check" option to be passed as a remount option.
3433 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
,
3434 &n_blocks_count
, 1)) {
3439 if (sbi
->s_mount_opt
& EXT4_MOUNT_ABORT
)
3440 ext4_abort(sb
, __func__
, "Abort forced by user");
3442 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3443 ((sbi
->s_mount_opt
& EXT4_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
3447 if (sbi
->s_journal
) {
3448 ext4_init_journal_params(sb
, sbi
->s_journal
);
3449 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
3452 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
) ||
3453 n_blocks_count
> ext4_blocks_count(es
)) {
3454 if (sbi
->s_mount_opt
& EXT4_MOUNT_ABORT
) {
3459 if (*flags
& MS_RDONLY
) {
3461 * First of all, the unconditional stuff we have to do
3462 * to disable replay of the journal when we next remount
3464 sb
->s_flags
|= MS_RDONLY
;
3467 * OK, test if we are remounting a valid rw partition
3468 * readonly, and if so set the rdonly flag and then
3469 * mark the partition as valid again.
3471 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
3472 (sbi
->s_mount_state
& EXT4_VALID_FS
))
3473 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
3476 ext4_mark_recovery_complete(sb
, es
);
3479 if ((ret
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3480 ~EXT4_FEATURE_RO_COMPAT_SUPP
))) {
3481 printk(KERN_WARNING
"EXT4-fs: %s: couldn't "
3482 "remount RDWR because of unsupported "
3483 "optional features (%x).\n", sb
->s_id
,
3484 (le32_to_cpu(sbi
->s_es
->s_feature_ro_compat
) &
3485 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
3491 * Make sure the group descriptor checksums
3492 * are sane. If they aren't, refuse to remount r/w.
3494 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
3495 struct ext4_group_desc
*gdp
=
3496 ext4_get_group_desc(sb
, g
, NULL
);
3498 if (!ext4_group_desc_csum_verify(sbi
, g
, gdp
)) {
3500 "EXT4-fs: ext4_remount: "
3501 "Checksum for group %u failed (%u!=%u)\n",
3502 g
, le16_to_cpu(ext4_group_desc_csum(sbi
, g
, gdp
)),
3503 le16_to_cpu(gdp
->bg_checksum
));
3510 * If we have an unprocessed orphan list hanging
3511 * around from a previously readonly bdev mount,
3512 * require a full umount/remount for now.
3514 if (es
->s_last_orphan
) {
3515 printk(KERN_WARNING
"EXT4-fs: %s: couldn't "
3516 "remount RDWR because of unprocessed "
3517 "orphan inode list. Please "
3518 "umount/remount instead.\n",
3525 * Mounting a RDONLY partition read-write, so reread
3526 * and store the current valid flag. (It may have
3527 * been changed by e2fsck since we originally mounted
3531 ext4_clear_journal_err(sb
, es
);
3532 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3533 if ((err
= ext4_group_extend(sb
, es
, n_blocks_count
)))
3535 if (!ext4_setup_super(sb
, es
, 0))
3536 sb
->s_flags
&= ~MS_RDONLY
;
3539 ext4_setup_system_zone(sb
);
3540 if (sbi
->s_journal
== NULL
)
3541 ext4_commit_super(sb
, 1);
3544 /* Release old quota file names */
3545 for (i
= 0; i
< MAXQUOTAS
; i
++)
3546 if (old_opts
.s_qf_names
[i
] &&
3547 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3548 kfree(old_opts
.s_qf_names
[i
]);
3553 sb
->s_flags
= old_sb_flags
;
3554 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
3555 sbi
->s_resuid
= old_opts
.s_resuid
;
3556 sbi
->s_resgid
= old_opts
.s_resgid
;
3557 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
3558 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
3559 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
3561 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
3562 for (i
= 0; i
< MAXQUOTAS
; i
++) {
3563 if (sbi
->s_qf_names
[i
] &&
3564 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3565 kfree(sbi
->s_qf_names
[i
]);
3566 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
3572 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
3574 struct super_block
*sb
= dentry
->d_sb
;
3575 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3576 struct ext4_super_block
*es
= sbi
->s_es
;
3579 if (test_opt(sb
, MINIX_DF
)) {
3580 sbi
->s_overhead_last
= 0;
3581 } else if (sbi
->s_blocks_last
!= ext4_blocks_count(es
)) {
3582 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3583 ext4_fsblk_t overhead
= 0;
3586 * Compute the overhead (FS structures). This is constant
3587 * for a given filesystem unless the number of block groups
3588 * changes so we cache the previous value until it does.
3592 * All of the blocks before first_data_block are
3595 overhead
= le32_to_cpu(es
->s_first_data_block
);
3598 * Add the overhead attributed to the superblock and
3599 * block group descriptors. If the sparse superblocks
3600 * feature is turned on, then not all groups have this.
3602 for (i
= 0; i
< ngroups
; i
++) {
3603 overhead
+= ext4_bg_has_super(sb
, i
) +
3604 ext4_bg_num_gdb(sb
, i
);
3609 * Every block group has an inode bitmap, a block
3610 * bitmap, and an inode table.
3612 overhead
+= ngroups
* (2 + sbi
->s_itb_per_group
);
3613 sbi
->s_overhead_last
= overhead
;
3615 sbi
->s_blocks_last
= ext4_blocks_count(es
);
3618 buf
->f_type
= EXT4_SUPER_MAGIC
;
3619 buf
->f_bsize
= sb
->s_blocksize
;
3620 buf
->f_blocks
= ext4_blocks_count(es
) - sbi
->s_overhead_last
;
3621 buf
->f_bfree
= percpu_counter_sum_positive(&sbi
->s_freeblocks_counter
) -
3622 percpu_counter_sum_positive(&sbi
->s_dirtyblocks_counter
);
3623 ext4_free_blocks_count_set(es
, buf
->f_bfree
);
3624 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
3625 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
3627 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
3628 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
3629 es
->s_free_inodes_count
= cpu_to_le32(buf
->f_ffree
);
3630 buf
->f_namelen
= EXT4_NAME_LEN
;
3631 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
3632 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
3633 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
3634 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
3639 /* Helper function for writing quotas on sync - we need to start transaction
3640 * before quota file is locked for write. Otherwise the are possible deadlocks:
3641 * Process 1 Process 2
3642 * ext4_create() quota_sync()
3643 * jbd2_journal_start() write_dquot()
3644 * vfs_dq_init() down(dqio_mutex)
3645 * down(dqio_mutex) jbd2_journal_start()
3651 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
3653 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_type
];
3656 static int ext4_write_dquot(struct dquot
*dquot
)
3660 struct inode
*inode
;
3662 inode
= dquot_to_inode(dquot
);
3663 handle
= ext4_journal_start(inode
,
3664 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
3666 return PTR_ERR(handle
);
3667 ret
= dquot_commit(dquot
);
3668 err
= ext4_journal_stop(handle
);
3674 static int ext4_acquire_dquot(struct dquot
*dquot
)
3679 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3680 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
3682 return PTR_ERR(handle
);
3683 ret
= dquot_acquire(dquot
);
3684 err
= ext4_journal_stop(handle
);
3690 static int ext4_release_dquot(struct dquot
*dquot
)
3695 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3696 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
3697 if (IS_ERR(handle
)) {
3698 /* Release dquot anyway to avoid endless cycle in dqput() */
3699 dquot_release(dquot
);
3700 return PTR_ERR(handle
);
3702 ret
= dquot_release(dquot
);
3703 err
= ext4_journal_stop(handle
);
3709 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
3711 /* Are we journaling quotas? */
3712 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
3713 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
3714 dquot_mark_dquot_dirty(dquot
);
3715 return ext4_write_dquot(dquot
);
3717 return dquot_mark_dquot_dirty(dquot
);
3721 static int ext4_write_info(struct super_block
*sb
, int type
)
3726 /* Data block + inode block */
3727 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
3729 return PTR_ERR(handle
);
3730 ret
= dquot_commit_info(sb
, type
);
3731 err
= ext4_journal_stop(handle
);
3738 * Turn on quotas during mount time - we need to find
3739 * the quota file and such...
3741 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
3743 return vfs_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
3744 EXT4_SB(sb
)->s_jquota_fmt
, type
);
3748 * Standard function to be called on quota_on
3750 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
3751 char *name
, int remount
)
3756 if (!test_opt(sb
, QUOTA
))
3758 /* When remounting, no checks are needed and in fact, name is NULL */
3760 return vfs_quota_on(sb
, type
, format_id
, name
, remount
);
3762 err
= kern_path(name
, LOOKUP_FOLLOW
, &path
);
3766 /* Quotafile not on the same filesystem? */
3767 if (path
.mnt
->mnt_sb
!= sb
) {
3771 /* Journaling quota? */
3772 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
3773 /* Quotafile not in fs root? */
3774 if (path
.dentry
->d_parent
!= sb
->s_root
)
3776 "EXT4-fs: Quota file not on filesystem root. "
3777 "Journaled quota will not work.\n");
3781 * When we journal data on quota file, we have to flush journal to see
3782 * all updates to the file when we bypass pagecache...
3784 if (EXT4_SB(sb
)->s_journal
&&
3785 ext4_should_journal_data(path
.dentry
->d_inode
)) {
3787 * We don't need to lock updates but journal_flush() could
3788 * otherwise be livelocked...
3790 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
3791 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
3792 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
3799 err
= vfs_quota_on_path(sb
, type
, format_id
, &path
);
3804 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3805 * acquiring the locks... As quota files are never truncated and quota code
3806 * itself serializes the operations (and noone else should touch the files)
3807 * we don't have to be afraid of races */
3808 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
3809 size_t len
, loff_t off
)
3811 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
3812 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
3814 int offset
= off
& (sb
->s_blocksize
- 1);
3817 struct buffer_head
*bh
;
3818 loff_t i_size
= i_size_read(inode
);
3822 if (off
+len
> i_size
)
3825 while (toread
> 0) {
3826 tocopy
= sb
->s_blocksize
- offset
< toread
?
3827 sb
->s_blocksize
- offset
: toread
;
3828 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
3831 if (!bh
) /* A hole? */
3832 memset(data
, 0, tocopy
);
3834 memcpy(data
, bh
->b_data
+offset
, tocopy
);
3844 /* Write to quotafile (we know the transaction is already started and has
3845 * enough credits) */
3846 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
3847 const char *data
, size_t len
, loff_t off
)
3849 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
3850 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
3852 int offset
= off
& (sb
->s_blocksize
- 1);
3854 int journal_quota
= EXT4_SB(sb
)->s_qf_names
[type
] != NULL
;
3855 size_t towrite
= len
;
3856 struct buffer_head
*bh
;
3857 handle_t
*handle
= journal_current_handle();
3859 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
3860 printk(KERN_WARNING
"EXT4-fs: Quota write (off=%llu, len=%llu)"
3861 " cancelled because transaction is not started.\n",
3862 (unsigned long long)off
, (unsigned long long)len
);
3865 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
3866 while (towrite
> 0) {
3867 tocopy
= sb
->s_blocksize
- offset
< towrite
?
3868 sb
->s_blocksize
- offset
: towrite
;
3869 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
3872 if (journal_quota
) {
3873 err
= ext4_journal_get_write_access(handle
, bh
);
3880 memcpy(bh
->b_data
+offset
, data
, tocopy
);
3881 flush_dcache_page(bh
->b_page
);
3884 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
3886 /* Always do at least ordered writes for quotas */
3887 err
= ext4_jbd2_file_inode(handle
, inode
);
3888 mark_buffer_dirty(bh
);
3899 if (len
== towrite
) {
3900 mutex_unlock(&inode
->i_mutex
);
3903 if (inode
->i_size
< off
+len
-towrite
) {
3904 i_size_write(inode
, off
+len
-towrite
);
3905 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
3907 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
3908 ext4_mark_inode_dirty(handle
, inode
);
3909 mutex_unlock(&inode
->i_mutex
);
3910 return len
- towrite
;
3915 static int ext4_get_sb(struct file_system_type
*fs_type
, int flags
,
3916 const char *dev_name
, void *data
, struct vfsmount
*mnt
)
3918 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
,mnt
);
3921 static struct file_system_type ext4_fs_type
= {
3922 .owner
= THIS_MODULE
,
3924 .get_sb
= ext4_get_sb
,
3925 .kill_sb
= kill_block_super
,
3926 .fs_flags
= FS_REQUIRES_DEV
,
3929 #ifdef CONFIG_EXT4DEV_COMPAT
3930 static int ext4dev_get_sb(struct file_system_type
*fs_type
, int flags
,
3931 const char *dev_name
, void *data
,struct vfsmount
*mnt
)
3933 printk(KERN_WARNING
"EXT4-fs: Update your userspace programs "
3934 "to mount using ext4\n");
3935 printk(KERN_WARNING
"EXT4-fs: ext4dev backwards compatibility "
3936 "will go away by 2.6.31\n");
3937 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
,mnt
);
3940 static struct file_system_type ext4dev_fs_type
= {
3941 .owner
= THIS_MODULE
,
3943 .get_sb
= ext4dev_get_sb
,
3944 .kill_sb
= kill_block_super
,
3945 .fs_flags
= FS_REQUIRES_DEV
,
3947 MODULE_ALIAS("ext4dev");
3950 static int __init
init_ext4_fs(void)
3954 err
= init_ext4_system_zone();
3957 ext4_kset
= kset_create_and_add("ext4", NULL
, fs_kobj
);
3960 ext4_proc_root
= proc_mkdir("fs/ext4", NULL
);
3961 err
= init_ext4_mballoc();
3965 err
= init_ext4_xattr();
3968 err
= init_inodecache();
3971 err
= register_filesystem(&ext4_fs_type
);
3974 #ifdef CONFIG_EXT4DEV_COMPAT
3975 err
= register_filesystem(&ext4dev_fs_type
);
3977 unregister_filesystem(&ext4_fs_type
);
3983 destroy_inodecache();
3987 exit_ext4_mballoc();
3989 remove_proc_entry("fs/ext4", NULL
);
3990 kset_unregister(ext4_kset
);
3992 exit_ext4_system_zone();
3996 static void __exit
exit_ext4_fs(void)
3998 unregister_filesystem(&ext4_fs_type
);
3999 #ifdef CONFIG_EXT4DEV_COMPAT
4000 unregister_filesystem(&ext4dev_fs_type
);
4002 destroy_inodecache();
4004 exit_ext4_mballoc();
4005 remove_proc_entry("fs/ext4", NULL
);
4006 kset_unregister(ext4_kset
);
4007 exit_ext4_system_zone();
4010 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4011 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4012 MODULE_LICENSE("GPL");
4013 module_init(init_ext4_fs
)
4014 module_exit(exit_ext4_fs
)