2 * linux/fs/ext4/super.c
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
11 * linux/fs/minix/inode.c
13 * Copyright (C) 1991, 1992 Linus Torvalds
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
19 #include <linux/module.h>
20 #include <linux/string.h>
22 #include <linux/time.h>
23 #include <linux/vmalloc.h>
24 #include <linux/jbd2.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/blkdev.h>
28 #include <linux/parser.h>
29 #include <linux/smp_lock.h>
30 #include <linux/buffer_head.h>
31 #include <linux/exportfs.h>
32 #include <linux/vfs.h>
33 #include <linux/random.h>
34 #include <linux/mount.h>
35 #include <linux/namei.h>
36 #include <linux/quotaops.h>
37 #include <linux/seq_file.h>
38 #include <linux/proc_fs.h>
39 #include <linux/ctype.h>
40 #include <linux/log2.h>
41 #include <linux/crc16.h>
42 #include <asm/uaccess.h>
45 #include "ext4_jbd2.h"
49 #define CREATE_TRACE_POINTS
50 #include <trace/events/ext4.h>
52 static int default_mb_history_length
= 1000;
54 module_param_named(default_mb_history_length
, default_mb_history_length
,
56 MODULE_PARM_DESC(default_mb_history_length
,
57 "Default number of entries saved for mb_history");
59 struct proc_dir_entry
*ext4_proc_root
;
60 static struct kset
*ext4_kset
;
62 static int ext4_load_journal(struct super_block
*, struct ext4_super_block
*,
63 unsigned long journal_devnum
);
64 static int ext4_commit_super(struct super_block
*sb
, int sync
);
65 static void ext4_mark_recovery_complete(struct super_block
*sb
,
66 struct ext4_super_block
*es
);
67 static void ext4_clear_journal_err(struct super_block
*sb
,
68 struct ext4_super_block
*es
);
69 static int ext4_sync_fs(struct super_block
*sb
, int wait
);
70 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
72 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
);
73 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
);
74 static int ext4_unfreeze(struct super_block
*sb
);
75 static void ext4_write_super(struct super_block
*sb
);
76 static int ext4_freeze(struct super_block
*sb
);
79 ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
80 struct ext4_group_desc
*bg
)
82 return le32_to_cpu(bg
->bg_block_bitmap_lo
) |
83 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
84 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
87 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
88 struct ext4_group_desc
*bg
)
90 return le32_to_cpu(bg
->bg_inode_bitmap_lo
) |
91 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
92 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
95 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
96 struct ext4_group_desc
*bg
)
98 return le32_to_cpu(bg
->bg_inode_table_lo
) |
99 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
100 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
103 __u32
ext4_free_blks_count(struct super_block
*sb
,
104 struct ext4_group_desc
*bg
)
106 return le16_to_cpu(bg
->bg_free_blocks_count_lo
) |
107 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
108 (__u32
)le16_to_cpu(bg
->bg_free_blocks_count_hi
) << 16 : 0);
111 __u32
ext4_free_inodes_count(struct super_block
*sb
,
112 struct ext4_group_desc
*bg
)
114 return le16_to_cpu(bg
->bg_free_inodes_count_lo
) |
115 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
116 (__u32
)le16_to_cpu(bg
->bg_free_inodes_count_hi
) << 16 : 0);
119 __u32
ext4_used_dirs_count(struct super_block
*sb
,
120 struct ext4_group_desc
*bg
)
122 return le16_to_cpu(bg
->bg_used_dirs_count_lo
) |
123 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
124 (__u32
)le16_to_cpu(bg
->bg_used_dirs_count_hi
) << 16 : 0);
127 __u32
ext4_itable_unused_count(struct super_block
*sb
,
128 struct ext4_group_desc
*bg
)
130 return le16_to_cpu(bg
->bg_itable_unused_lo
) |
131 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
132 (__u32
)le16_to_cpu(bg
->bg_itable_unused_hi
) << 16 : 0);
135 void ext4_block_bitmap_set(struct super_block
*sb
,
136 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
138 bg
->bg_block_bitmap_lo
= cpu_to_le32((u32
)blk
);
139 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
140 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
143 void ext4_inode_bitmap_set(struct super_block
*sb
,
144 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
146 bg
->bg_inode_bitmap_lo
= cpu_to_le32((u32
)blk
);
147 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
148 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
151 void ext4_inode_table_set(struct super_block
*sb
,
152 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
154 bg
->bg_inode_table_lo
= cpu_to_le32((u32
)blk
);
155 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
156 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
159 void ext4_free_blks_set(struct super_block
*sb
,
160 struct ext4_group_desc
*bg
, __u32 count
)
162 bg
->bg_free_blocks_count_lo
= cpu_to_le16((__u16
)count
);
163 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
164 bg
->bg_free_blocks_count_hi
= cpu_to_le16(count
>> 16);
167 void ext4_free_inodes_set(struct super_block
*sb
,
168 struct ext4_group_desc
*bg
, __u32 count
)
170 bg
->bg_free_inodes_count_lo
= cpu_to_le16((__u16
)count
);
171 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
172 bg
->bg_free_inodes_count_hi
= cpu_to_le16(count
>> 16);
175 void ext4_used_dirs_set(struct super_block
*sb
,
176 struct ext4_group_desc
*bg
, __u32 count
)
178 bg
->bg_used_dirs_count_lo
= cpu_to_le16((__u16
)count
);
179 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
180 bg
->bg_used_dirs_count_hi
= cpu_to_le16(count
>> 16);
183 void ext4_itable_unused_set(struct super_block
*sb
,
184 struct ext4_group_desc
*bg
, __u32 count
)
186 bg
->bg_itable_unused_lo
= cpu_to_le16((__u16
)count
);
187 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
188 bg
->bg_itable_unused_hi
= cpu_to_le16(count
>> 16);
192 * Wrappers for jbd2_journal_start/end.
194 * The only special thing we need to do here is to make sure that all
195 * journal_end calls result in the superblock being marked dirty, so
196 * that sync() will call the filesystem's write_super callback if
199 handle_t
*ext4_journal_start_sb(struct super_block
*sb
, int nblocks
)
203 if (sb
->s_flags
& MS_RDONLY
)
204 return ERR_PTR(-EROFS
);
206 /* Special case here: if the journal has aborted behind our
207 * backs (eg. EIO in the commit thread), then we still need to
208 * take the FS itself readonly cleanly. */
209 journal
= EXT4_SB(sb
)->s_journal
;
211 if (is_journal_aborted(journal
)) {
212 ext4_abort(sb
, __func__
, "Detected aborted journal");
213 return ERR_PTR(-EROFS
);
215 return jbd2_journal_start(journal
, nblocks
);
218 * We're not journaling, return the appropriate indication.
220 current
->journal_info
= EXT4_NOJOURNAL_HANDLE
;
221 return current
->journal_info
;
225 * The only special thing we need to do here is to make sure that all
226 * jbd2_journal_stop calls result in the superblock being marked dirty, so
227 * that sync() will call the filesystem's write_super callback if
230 int __ext4_journal_stop(const char *where
, handle_t
*handle
)
232 struct super_block
*sb
;
236 if (!ext4_handle_valid(handle
)) {
238 * Do this here since we don't call jbd2_journal_stop() in
241 current
->journal_info
= NULL
;
244 sb
= handle
->h_transaction
->t_journal
->j_private
;
246 rc
= jbd2_journal_stop(handle
);
251 __ext4_std_error(sb
, where
, err
);
255 void ext4_journal_abort_handle(const char *caller
, const char *err_fn
,
256 struct buffer_head
*bh
, handle_t
*handle
, int err
)
259 const char *errstr
= ext4_decode_error(NULL
, err
, nbuf
);
261 BUG_ON(!ext4_handle_valid(handle
));
264 BUFFER_TRACE(bh
, "abort");
269 if (is_handle_aborted(handle
))
272 printk(KERN_ERR
"%s: aborting transaction: %s in %s\n",
273 caller
, errstr
, err_fn
);
275 jbd2_journal_abort_handle(handle
);
278 /* Deal with the reporting of failure conditions on a filesystem such as
279 * inconsistencies detected or read IO failures.
281 * On ext2, we can store the error state of the filesystem in the
282 * superblock. That is not possible on ext4, because we may have other
283 * write ordering constraints on the superblock which prevent us from
284 * writing it out straight away; and given that the journal is about to
285 * be aborted, we can't rely on the current, or future, transactions to
286 * write out the superblock safely.
288 * We'll just use the jbd2_journal_abort() error code to record an error in
289 * the journal instead. On recovery, the journal will compain about
290 * that error until we've noted it down and cleared it.
293 static void ext4_handle_error(struct super_block
*sb
)
295 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
297 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
298 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
300 if (sb
->s_flags
& MS_RDONLY
)
303 if (!test_opt(sb
, ERRORS_CONT
)) {
304 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
306 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
308 jbd2_journal_abort(journal
, -EIO
);
310 if (test_opt(sb
, ERRORS_RO
)) {
311 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
312 sb
->s_flags
|= MS_RDONLY
;
314 ext4_commit_super(sb
, 1);
315 if (test_opt(sb
, ERRORS_PANIC
))
316 panic("EXT4-fs (device %s): panic forced after error\n",
320 void ext4_error(struct super_block
*sb
, const char *function
,
321 const char *fmt
, ...)
326 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
331 ext4_handle_error(sb
);
334 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
341 errstr
= "IO failure";
344 errstr
= "Out of memory";
347 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
348 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
349 errstr
= "Journal has aborted";
351 errstr
= "Readonly filesystem";
354 /* If the caller passed in an extra buffer for unknown
355 * errors, textualise them now. Else we just return
358 /* Check for truncated error codes... */
359 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
368 /* __ext4_std_error decodes expected errors from journaling functions
369 * automatically and invokes the appropriate error response. */
371 void __ext4_std_error(struct super_block
*sb
, const char *function
, int errno
)
376 /* Special case: if the error is EROFS, and we're not already
377 * inside a transaction, then there's really no point in logging
379 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
380 (sb
->s_flags
& MS_RDONLY
))
383 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
384 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s: %s\n",
385 sb
->s_id
, function
, errstr
);
387 ext4_handle_error(sb
);
391 * ext4_abort is a much stronger failure handler than ext4_error. The
392 * abort function may be used to deal with unrecoverable failures such
393 * as journal IO errors or ENOMEM at a critical moment in log management.
395 * We unconditionally force the filesystem into an ABORT|READONLY state,
396 * unless the error response on the fs has been set to panic in which
397 * case we take the easy way out and panic immediately.
400 void ext4_abort(struct super_block
*sb
, const char *function
,
401 const char *fmt
, ...)
406 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
411 if (test_opt(sb
, ERRORS_PANIC
))
412 panic("EXT4-fs panic from previous error\n");
414 if (sb
->s_flags
& MS_RDONLY
)
417 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
418 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
419 sb
->s_flags
|= MS_RDONLY
;
420 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
421 if (EXT4_SB(sb
)->s_journal
)
422 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
425 void ext4_msg (struct super_block
* sb
, const char *prefix
,
426 const char *fmt
, ...)
431 printk("%sEXT4-fs (%s): ", prefix
, sb
->s_id
);
437 void ext4_warning(struct super_block
*sb
, const char *function
,
438 const char *fmt
, ...)
443 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s: ",
450 void ext4_grp_locked_error(struct super_block
*sb
, ext4_group_t grp
,
451 const char *function
, const char *fmt
, ...)
456 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
459 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
464 if (test_opt(sb
, ERRORS_CONT
)) {
465 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
466 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
467 ext4_commit_super(sb
, 0);
470 ext4_unlock_group(sb
, grp
);
471 ext4_handle_error(sb
);
473 * We only get here in the ERRORS_RO case; relocking the group
474 * may be dangerous, but nothing bad will happen since the
475 * filesystem will have already been marked read/only and the
476 * journal has been aborted. We return 1 as a hint to callers
477 * who might what to use the return value from
478 * ext4_grp_locked_error() to distinguish beween the
479 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
480 * aggressively from the ext4 function in question, with a
481 * more appropriate error code.
483 ext4_lock_group(sb
, grp
);
487 void ext4_update_dynamic_rev(struct super_block
*sb
)
489 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
491 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
494 ext4_warning(sb
, __func__
,
495 "updating to rev %d because of new feature flag, "
496 "running e2fsck is recommended",
499 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
500 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
501 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
502 /* leave es->s_feature_*compat flags alone */
503 /* es->s_uuid will be set by e2fsck if empty */
506 * The rest of the superblock fields should be zero, and if not it
507 * means they are likely already in use, so leave them alone. We
508 * can leave it up to e2fsck to clean up any inconsistencies there.
513 * Open the external journal device
515 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
517 struct block_device
*bdev
;
518 char b
[BDEVNAME_SIZE
];
520 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
526 ext4_msg(sb
, KERN_ERR
, "failed to open journal device %s: %ld",
527 __bdevname(dev
, b
), PTR_ERR(bdev
));
532 * Release the journal device
534 static int ext4_blkdev_put(struct block_device
*bdev
)
537 return blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
540 static int ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
542 struct block_device
*bdev
;
545 bdev
= sbi
->journal_bdev
;
547 ret
= ext4_blkdev_put(bdev
);
548 sbi
->journal_bdev
= NULL
;
553 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
555 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
558 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
562 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
563 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
565 printk(KERN_ERR
"sb_info orphan list:\n");
566 list_for_each(l
, &sbi
->s_orphan
) {
567 struct inode
*inode
= orphan_list_entry(l
);
569 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
570 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
571 inode
->i_mode
, inode
->i_nlink
,
576 static void ext4_put_super(struct super_block
*sb
)
578 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
579 struct ext4_super_block
*es
= sbi
->s_es
;
585 ext4_commit_super(sb
, 1);
587 ext4_release_system_zone(sb
);
589 ext4_ext_release(sb
);
590 ext4_xattr_put_super(sb
);
591 if (sbi
->s_journal
) {
592 err
= jbd2_journal_destroy(sbi
->s_journal
);
593 sbi
->s_journal
= NULL
;
595 ext4_abort(sb
, __func__
,
596 "Couldn't clean up the journal");
598 if (!(sb
->s_flags
& MS_RDONLY
)) {
599 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
600 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
601 ext4_commit_super(sb
, 1);
604 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
606 kobject_del(&sbi
->s_kobj
);
608 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
609 brelse(sbi
->s_group_desc
[i
]);
610 kfree(sbi
->s_group_desc
);
611 if (is_vmalloc_addr(sbi
->s_flex_groups
))
612 vfree(sbi
->s_flex_groups
);
614 kfree(sbi
->s_flex_groups
);
615 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
616 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
617 percpu_counter_destroy(&sbi
->s_dirs_counter
);
618 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
621 for (i
= 0; i
< MAXQUOTAS
; i
++)
622 kfree(sbi
->s_qf_names
[i
]);
625 /* Debugging code just in case the in-memory inode orphan list
626 * isn't empty. The on-disk one can be non-empty if we've
627 * detected an error and taken the fs readonly, but the
628 * in-memory list had better be clean by this point. */
629 if (!list_empty(&sbi
->s_orphan
))
630 dump_orphan_list(sb
, sbi
);
631 J_ASSERT(list_empty(&sbi
->s_orphan
));
633 invalidate_bdev(sb
->s_bdev
);
634 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
636 * Invalidate the journal device's buffers. We don't want them
637 * floating about in memory - the physical journal device may
638 * hotswapped, and it breaks the `ro-after' testing code.
640 sync_blockdev(sbi
->journal_bdev
);
641 invalidate_bdev(sbi
->journal_bdev
);
642 ext4_blkdev_remove(sbi
);
644 sb
->s_fs_info
= NULL
;
646 * Now that we are completely done shutting down the
647 * superblock, we need to actually destroy the kobject.
651 kobject_put(&sbi
->s_kobj
);
652 wait_for_completion(&sbi
->s_kobj_unregister
);
653 kfree(sbi
->s_blockgroup_lock
);
657 static struct kmem_cache
*ext4_inode_cachep
;
660 * Called inside transaction, so use GFP_NOFS
662 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
664 struct ext4_inode_info
*ei
;
666 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
670 ei
->vfs_inode
.i_version
= 1;
671 ei
->vfs_inode
.i_data
.writeback_index
= 0;
672 memset(&ei
->i_cached_extent
, 0, sizeof(struct ext4_ext_cache
));
673 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
674 spin_lock_init(&ei
->i_prealloc_lock
);
676 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
677 * therefore it can be null here. Don't check it, just initialize
680 jbd2_journal_init_jbd_inode(&ei
->jinode
, &ei
->vfs_inode
);
681 ei
->i_reserved_data_blocks
= 0;
682 ei
->i_reserved_meta_blocks
= 0;
683 ei
->i_allocated_meta_blocks
= 0;
684 ei
->i_delalloc_reserved_flag
= 0;
685 spin_lock_init(&(ei
->i_block_reservation_lock
));
687 return &ei
->vfs_inode
;
690 static void ext4_destroy_inode(struct inode
*inode
)
692 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
693 ext4_msg(inode
->i_sb
, KERN_ERR
,
694 "Inode %lu (%p): orphan list check failed!",
695 inode
->i_ino
, EXT4_I(inode
));
696 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
697 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
701 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
704 static void init_once(void *foo
)
706 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
708 INIT_LIST_HEAD(&ei
->i_orphan
);
709 #ifdef CONFIG_EXT4_FS_XATTR
710 init_rwsem(&ei
->xattr_sem
);
712 init_rwsem(&ei
->i_data_sem
);
713 inode_init_once(&ei
->vfs_inode
);
716 static int init_inodecache(void)
718 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
719 sizeof(struct ext4_inode_info
),
720 0, (SLAB_RECLAIM_ACCOUNT
|
723 if (ext4_inode_cachep
== NULL
)
728 static void destroy_inodecache(void)
730 kmem_cache_destroy(ext4_inode_cachep
);
733 static void ext4_clear_inode(struct inode
*inode
)
735 ext4_discard_preallocations(inode
);
736 if (EXT4_JOURNAL(inode
))
737 jbd2_journal_release_jbd_inode(EXT4_SB(inode
->i_sb
)->s_journal
,
738 &EXT4_I(inode
)->jinode
);
741 static inline void ext4_show_quota_options(struct seq_file
*seq
,
742 struct super_block
*sb
)
744 #if defined(CONFIG_QUOTA)
745 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
747 if (sbi
->s_jquota_fmt
)
748 seq_printf(seq
, ",jqfmt=%s",
749 (sbi
->s_jquota_fmt
== QFMT_VFS_OLD
) ? "vfsold" : "vfsv0");
751 if (sbi
->s_qf_names
[USRQUOTA
])
752 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
754 if (sbi
->s_qf_names
[GRPQUOTA
])
755 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
757 if (sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
)
758 seq_puts(seq
, ",usrquota");
760 if (sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
)
761 seq_puts(seq
, ",grpquota");
767 * - it's set to a non-default value OR
768 * - if the per-sb default is different from the global default
770 static int ext4_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
773 unsigned long def_mount_opts
;
774 struct super_block
*sb
= vfs
->mnt_sb
;
775 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
776 struct ext4_super_block
*es
= sbi
->s_es
;
778 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
779 def_errors
= le16_to_cpu(es
->s_errors
);
781 if (sbi
->s_sb_block
!= 1)
782 seq_printf(seq
, ",sb=%llu", sbi
->s_sb_block
);
783 if (test_opt(sb
, MINIX_DF
))
784 seq_puts(seq
, ",minixdf");
785 if (test_opt(sb
, GRPID
) && !(def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
786 seq_puts(seq
, ",grpid");
787 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
788 seq_puts(seq
, ",nogrpid");
789 if (sbi
->s_resuid
!= EXT4_DEF_RESUID
||
790 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
) {
791 seq_printf(seq
, ",resuid=%u", sbi
->s_resuid
);
793 if (sbi
->s_resgid
!= EXT4_DEF_RESGID
||
794 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
) {
795 seq_printf(seq
, ",resgid=%u", sbi
->s_resgid
);
797 if (test_opt(sb
, ERRORS_RO
)) {
798 if (def_errors
== EXT4_ERRORS_PANIC
||
799 def_errors
== EXT4_ERRORS_CONTINUE
) {
800 seq_puts(seq
, ",errors=remount-ro");
803 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
804 seq_puts(seq
, ",errors=continue");
805 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
806 seq_puts(seq
, ",errors=panic");
807 if (test_opt(sb
, NO_UID32
) && !(def_mount_opts
& EXT4_DEFM_UID16
))
808 seq_puts(seq
, ",nouid32");
809 if (test_opt(sb
, DEBUG
) && !(def_mount_opts
& EXT4_DEFM_DEBUG
))
810 seq_puts(seq
, ",debug");
811 if (test_opt(sb
, OLDALLOC
))
812 seq_puts(seq
, ",oldalloc");
813 #ifdef CONFIG_EXT4_FS_XATTR
814 if (test_opt(sb
, XATTR_USER
) &&
815 !(def_mount_opts
& EXT4_DEFM_XATTR_USER
))
816 seq_puts(seq
, ",user_xattr");
817 if (!test_opt(sb
, XATTR_USER
) &&
818 (def_mount_opts
& EXT4_DEFM_XATTR_USER
)) {
819 seq_puts(seq
, ",nouser_xattr");
822 #ifdef CONFIG_EXT4_FS_POSIX_ACL
823 if (test_opt(sb
, POSIX_ACL
) && !(def_mount_opts
& EXT4_DEFM_ACL
))
824 seq_puts(seq
, ",acl");
825 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT4_DEFM_ACL
))
826 seq_puts(seq
, ",noacl");
828 if (sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
) {
829 seq_printf(seq
, ",commit=%u",
830 (unsigned) (sbi
->s_commit_interval
/ HZ
));
832 if (sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
) {
833 seq_printf(seq
, ",min_batch_time=%u",
834 (unsigned) sbi
->s_min_batch_time
);
836 if (sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
) {
837 seq_printf(seq
, ",max_batch_time=%u",
838 (unsigned) sbi
->s_min_batch_time
);
842 * We're changing the default of barrier mount option, so
843 * let's always display its mount state so it's clear what its
846 seq_puts(seq
, ",barrier=");
847 seq_puts(seq
, test_opt(sb
, BARRIER
) ? "1" : "0");
848 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
))
849 seq_puts(seq
, ",journal_async_commit");
850 if (test_opt(sb
, NOBH
))
851 seq_puts(seq
, ",nobh");
852 if (test_opt(sb
, I_VERSION
))
853 seq_puts(seq
, ",i_version");
854 if (!test_opt(sb
, DELALLOC
))
855 seq_puts(seq
, ",nodelalloc");
859 seq_printf(seq
, ",stripe=%lu", sbi
->s_stripe
);
861 * journal mode get enabled in different ways
862 * So just print the value even if we didn't specify it
864 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
865 seq_puts(seq
, ",data=journal");
866 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
867 seq_puts(seq
, ",data=ordered");
868 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
869 seq_puts(seq
, ",data=writeback");
871 if (sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
872 seq_printf(seq
, ",inode_readahead_blks=%u",
873 sbi
->s_inode_readahead_blks
);
875 if (test_opt(sb
, DATA_ERR_ABORT
))
876 seq_puts(seq
, ",data_err=abort");
878 if (test_opt(sb
, NO_AUTO_DA_ALLOC
))
879 seq_puts(seq
, ",noauto_da_alloc");
881 ext4_show_quota_options(seq
, sb
);
886 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
887 u64 ino
, u32 generation
)
891 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
892 return ERR_PTR(-ESTALE
);
893 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
894 return ERR_PTR(-ESTALE
);
896 /* iget isn't really right if the inode is currently unallocated!!
898 * ext4_read_inode will return a bad_inode if the inode had been
899 * deleted, so we should be safe.
901 * Currently we don't know the generation for parent directory, so
902 * a generation of 0 means "accept any"
904 inode
= ext4_iget(sb
, ino
);
906 return ERR_CAST(inode
);
907 if (generation
&& inode
->i_generation
!= generation
) {
909 return ERR_PTR(-ESTALE
);
915 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
916 int fh_len
, int fh_type
)
918 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
922 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
923 int fh_len
, int fh_type
)
925 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
930 * Try to release metadata pages (indirect blocks, directories) which are
931 * mapped via the block device. Since these pages could have journal heads
932 * which would prevent try_to_free_buffers() from freeing them, we must use
933 * jbd2 layer's try_to_free_buffers() function to release them.
935 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
938 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
940 WARN_ON(PageChecked(page
));
941 if (!page_has_buffers(page
))
944 return jbd2_journal_try_to_free_buffers(journal
, page
,
946 return try_to_free_buffers(page
);
950 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
951 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
953 static int ext4_write_dquot(struct dquot
*dquot
);
954 static int ext4_acquire_dquot(struct dquot
*dquot
);
955 static int ext4_release_dquot(struct dquot
*dquot
);
956 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
957 static int ext4_write_info(struct super_block
*sb
, int type
);
958 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
959 char *path
, int remount
);
960 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
961 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
962 size_t len
, loff_t off
);
963 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
964 const char *data
, size_t len
, loff_t off
);
966 static struct dquot_operations ext4_quota_operations
= {
967 .initialize
= dquot_initialize
,
969 .alloc_space
= dquot_alloc_space
,
970 .reserve_space
= dquot_reserve_space
,
971 .claim_space
= dquot_claim_space
,
972 .release_rsv
= dquot_release_reserved_space
,
973 .get_reserved_space
= ext4_get_reserved_space
,
974 .alloc_inode
= dquot_alloc_inode
,
975 .free_space
= dquot_free_space
,
976 .free_inode
= dquot_free_inode
,
977 .transfer
= dquot_transfer
,
978 .write_dquot
= ext4_write_dquot
,
979 .acquire_dquot
= ext4_acquire_dquot
,
980 .release_dquot
= ext4_release_dquot
,
981 .mark_dirty
= ext4_mark_dquot_dirty
,
982 .write_info
= ext4_write_info
,
983 .alloc_dquot
= dquot_alloc
,
984 .destroy_dquot
= dquot_destroy
,
987 static struct quotactl_ops ext4_qctl_operations
= {
988 .quota_on
= ext4_quota_on
,
989 .quota_off
= vfs_quota_off
,
990 .quota_sync
= vfs_quota_sync
,
991 .get_info
= vfs_get_dqinfo
,
992 .set_info
= vfs_set_dqinfo
,
993 .get_dqblk
= vfs_get_dqblk
,
994 .set_dqblk
= vfs_set_dqblk
998 static const struct super_operations ext4_sops
= {
999 .alloc_inode
= ext4_alloc_inode
,
1000 .destroy_inode
= ext4_destroy_inode
,
1001 .write_inode
= ext4_write_inode
,
1002 .dirty_inode
= ext4_dirty_inode
,
1003 .delete_inode
= ext4_delete_inode
,
1004 .put_super
= ext4_put_super
,
1005 .sync_fs
= ext4_sync_fs
,
1006 .freeze_fs
= ext4_freeze
,
1007 .unfreeze_fs
= ext4_unfreeze
,
1008 .statfs
= ext4_statfs
,
1009 .remount_fs
= ext4_remount
,
1010 .clear_inode
= ext4_clear_inode
,
1011 .show_options
= ext4_show_options
,
1013 .quota_read
= ext4_quota_read
,
1014 .quota_write
= ext4_quota_write
,
1016 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1019 static const struct super_operations ext4_nojournal_sops
= {
1020 .alloc_inode
= ext4_alloc_inode
,
1021 .destroy_inode
= ext4_destroy_inode
,
1022 .write_inode
= ext4_write_inode
,
1023 .dirty_inode
= ext4_dirty_inode
,
1024 .delete_inode
= ext4_delete_inode
,
1025 .write_super
= ext4_write_super
,
1026 .put_super
= ext4_put_super
,
1027 .statfs
= ext4_statfs
,
1028 .remount_fs
= ext4_remount
,
1029 .clear_inode
= ext4_clear_inode
,
1030 .show_options
= ext4_show_options
,
1032 .quota_read
= ext4_quota_read
,
1033 .quota_write
= ext4_quota_write
,
1035 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1038 static const struct export_operations ext4_export_ops
= {
1039 .fh_to_dentry
= ext4_fh_to_dentry
,
1040 .fh_to_parent
= ext4_fh_to_parent
,
1041 .get_parent
= ext4_get_parent
,
1045 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1046 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1047 Opt_nouid32
, Opt_debug
, Opt_oldalloc
, Opt_orlov
,
1048 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1049 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
, Opt_nobh
, Opt_bh
,
1050 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
,
1051 Opt_journal_update
, Opt_journal_dev
,
1052 Opt_journal_checksum
, Opt_journal_async_commit
,
1053 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1054 Opt_data_err_abort
, Opt_data_err_ignore
, Opt_mb_history_length
,
1055 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1056 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_quota
, Opt_noquota
,
1057 Opt_ignore
, Opt_barrier
, Opt_nobarrier
, Opt_err
, Opt_resize
,
1058 Opt_usrquota
, Opt_grpquota
, Opt_i_version
,
1059 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
,
1060 Opt_block_validity
, Opt_noblock_validity
,
1061 Opt_inode_readahead_blks
, Opt_journal_ioprio
1064 static const match_table_t tokens
= {
1065 {Opt_bsd_df
, "bsddf"},
1066 {Opt_minix_df
, "minixdf"},
1067 {Opt_grpid
, "grpid"},
1068 {Opt_grpid
, "bsdgroups"},
1069 {Opt_nogrpid
, "nogrpid"},
1070 {Opt_nogrpid
, "sysvgroups"},
1071 {Opt_resgid
, "resgid=%u"},
1072 {Opt_resuid
, "resuid=%u"},
1074 {Opt_err_cont
, "errors=continue"},
1075 {Opt_err_panic
, "errors=panic"},
1076 {Opt_err_ro
, "errors=remount-ro"},
1077 {Opt_nouid32
, "nouid32"},
1078 {Opt_debug
, "debug"},
1079 {Opt_oldalloc
, "oldalloc"},
1080 {Opt_orlov
, "orlov"},
1081 {Opt_user_xattr
, "user_xattr"},
1082 {Opt_nouser_xattr
, "nouser_xattr"},
1084 {Opt_noacl
, "noacl"},
1085 {Opt_noload
, "noload"},
1088 {Opt_commit
, "commit=%u"},
1089 {Opt_min_batch_time
, "min_batch_time=%u"},
1090 {Opt_max_batch_time
, "max_batch_time=%u"},
1091 {Opt_journal_update
, "journal=update"},
1092 {Opt_journal_dev
, "journal_dev=%u"},
1093 {Opt_journal_checksum
, "journal_checksum"},
1094 {Opt_journal_async_commit
, "journal_async_commit"},
1095 {Opt_abort
, "abort"},
1096 {Opt_data_journal
, "data=journal"},
1097 {Opt_data_ordered
, "data=ordered"},
1098 {Opt_data_writeback
, "data=writeback"},
1099 {Opt_data_err_abort
, "data_err=abort"},
1100 {Opt_data_err_ignore
, "data_err=ignore"},
1101 {Opt_mb_history_length
, "mb_history_length=%u"},
1102 {Opt_offusrjquota
, "usrjquota="},
1103 {Opt_usrjquota
, "usrjquota=%s"},
1104 {Opt_offgrpjquota
, "grpjquota="},
1105 {Opt_grpjquota
, "grpjquota=%s"},
1106 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1107 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1108 {Opt_grpquota
, "grpquota"},
1109 {Opt_noquota
, "noquota"},
1110 {Opt_quota
, "quota"},
1111 {Opt_usrquota
, "usrquota"},
1112 {Opt_barrier
, "barrier=%u"},
1113 {Opt_barrier
, "barrier"},
1114 {Opt_nobarrier
, "nobarrier"},
1115 {Opt_i_version
, "i_version"},
1116 {Opt_stripe
, "stripe=%u"},
1117 {Opt_resize
, "resize"},
1118 {Opt_delalloc
, "delalloc"},
1119 {Opt_nodelalloc
, "nodelalloc"},
1120 {Opt_block_validity
, "block_validity"},
1121 {Opt_noblock_validity
, "noblock_validity"},
1122 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1123 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1124 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1125 {Opt_auto_da_alloc
, "auto_da_alloc"},
1126 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1130 static ext4_fsblk_t
get_sb_block(void **data
)
1132 ext4_fsblk_t sb_block
;
1133 char *options
= (char *) *data
;
1135 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1136 return 1; /* Default location */
1139 /* TODO: use simple_strtoll with >32bit ext4 */
1140 sb_block
= simple_strtoul(options
, &options
, 0);
1141 if (*options
&& *options
!= ',') {
1142 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1146 if (*options
== ',')
1148 *data
= (void *) options
;
1153 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1155 static int parse_options(char *options
, struct super_block
*sb
,
1156 unsigned long *journal_devnum
,
1157 unsigned int *journal_ioprio
,
1158 ext4_fsblk_t
*n_blocks_count
, int is_remount
)
1160 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1162 substring_t args
[MAX_OPT_ARGS
];
1173 while ((p
= strsep(&options
, ",")) != NULL
) {
1178 token
= match_token(p
, tokens
, args
);
1181 clear_opt(sbi
->s_mount_opt
, MINIX_DF
);
1184 set_opt(sbi
->s_mount_opt
, MINIX_DF
);
1187 set_opt(sbi
->s_mount_opt
, GRPID
);
1190 clear_opt(sbi
->s_mount_opt
, GRPID
);
1193 if (match_int(&args
[0], &option
))
1195 sbi
->s_resuid
= option
;
1198 if (match_int(&args
[0], &option
))
1200 sbi
->s_resgid
= option
;
1203 /* handled by get_sb_block() instead of here */
1204 /* *sb_block = match_int(&args[0]); */
1207 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1208 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1209 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1212 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1213 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1214 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1217 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1218 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1219 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1222 set_opt(sbi
->s_mount_opt
, NO_UID32
);
1225 set_opt(sbi
->s_mount_opt
, DEBUG
);
1228 set_opt(sbi
->s_mount_opt
, OLDALLOC
);
1231 clear_opt(sbi
->s_mount_opt
, OLDALLOC
);
1233 #ifdef CONFIG_EXT4_FS_XATTR
1234 case Opt_user_xattr
:
1235 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
1237 case Opt_nouser_xattr
:
1238 clear_opt(sbi
->s_mount_opt
, XATTR_USER
);
1241 case Opt_user_xattr
:
1242 case Opt_nouser_xattr
:
1243 ext4_msg(sb
, KERN_ERR
, "(no)user_xattr options not supported");
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 ext4_msg(sb
, KERN_ERR
, "(no)acl options not supported");
1259 case Opt_journal_update
:
1261 /* Eventually we will want to be able to create
1262 a journal file here. For now, only allow the
1263 user to specify an existing inode to be the
1266 ext4_msg(sb
, KERN_ERR
,
1267 "Cannot specify journal on remount");
1270 set_opt(sbi
->s_mount_opt
, UPDATE_JOURNAL
);
1272 case Opt_journal_dev
:
1274 ext4_msg(sb
, KERN_ERR
,
1275 "Cannot specify journal on remount");
1278 if (match_int(&args
[0], &option
))
1280 *journal_devnum
= option
;
1282 case Opt_journal_checksum
:
1283 break; /* Kept for backwards compatibility */
1284 case Opt_journal_async_commit
:
1285 set_opt(sbi
->s_mount_opt
, JOURNAL_ASYNC_COMMIT
);
1288 set_opt(sbi
->s_mount_opt
, NOLOAD
);
1291 if (match_int(&args
[0], &option
))
1296 option
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1297 sbi
->s_commit_interval
= HZ
* option
;
1299 case Opt_max_batch_time
:
1300 if (match_int(&args
[0], &option
))
1305 option
= EXT4_DEF_MAX_BATCH_TIME
;
1306 sbi
->s_max_batch_time
= option
;
1308 case Opt_min_batch_time
:
1309 if (match_int(&args
[0], &option
))
1313 sbi
->s_min_batch_time
= option
;
1315 case Opt_data_journal
:
1316 data_opt
= EXT4_MOUNT_JOURNAL_DATA
;
1318 case Opt_data_ordered
:
1319 data_opt
= EXT4_MOUNT_ORDERED_DATA
;
1321 case Opt_data_writeback
:
1322 data_opt
= EXT4_MOUNT_WRITEBACK_DATA
;
1325 if ((sbi
->s_mount_opt
& EXT4_MOUNT_DATA_FLAGS
)
1327 ext4_msg(sb
, KERN_ERR
,
1328 "Cannot change data mode on remount");
1332 sbi
->s_mount_opt
&= ~EXT4_MOUNT_DATA_FLAGS
;
1333 sbi
->s_mount_opt
|= data_opt
;
1336 case Opt_data_err_abort
:
1337 set_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1339 case Opt_data_err_ignore
:
1340 clear_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1342 case Opt_mb_history_length
:
1343 if (match_int(&args
[0], &option
))
1347 sbi
->s_mb_history_max
= option
;
1356 if (sb_any_quota_loaded(sb
) &&
1357 !sbi
->s_qf_names
[qtype
]) {
1358 ext4_msg(sb
, KERN_ERR
,
1359 "Cannot change journaled "
1360 "quota options when quota turned on");
1363 qname
= match_strdup(&args
[0]);
1365 ext4_msg(sb
, KERN_ERR
,
1366 "Not enough memory for "
1367 "storing quotafile name");
1370 if (sbi
->s_qf_names
[qtype
] &&
1371 strcmp(sbi
->s_qf_names
[qtype
], qname
)) {
1372 ext4_msg(sb
, KERN_ERR
,
1373 "%s quota file already "
1374 "specified", QTYPE2NAME(qtype
));
1378 sbi
->s_qf_names
[qtype
] = qname
;
1379 if (strchr(sbi
->s_qf_names
[qtype
], '/')) {
1380 ext4_msg(sb
, KERN_ERR
,
1381 "quotafile must be on "
1383 kfree(sbi
->s_qf_names
[qtype
]);
1384 sbi
->s_qf_names
[qtype
] = NULL
;
1387 set_opt(sbi
->s_mount_opt
, QUOTA
);
1389 case Opt_offusrjquota
:
1392 case Opt_offgrpjquota
:
1395 if (sb_any_quota_loaded(sb
) &&
1396 sbi
->s_qf_names
[qtype
]) {
1397 ext4_msg(sb
, KERN_ERR
, "Cannot change "
1398 "journaled quota options when "
1403 * The space will be released later when all options
1404 * are confirmed to be correct
1406 sbi
->s_qf_names
[qtype
] = NULL
;
1408 case Opt_jqfmt_vfsold
:
1409 qfmt
= QFMT_VFS_OLD
;
1411 case Opt_jqfmt_vfsv0
:
1414 if (sb_any_quota_loaded(sb
) &&
1415 sbi
->s_jquota_fmt
!= qfmt
) {
1416 ext4_msg(sb
, KERN_ERR
, "Cannot change "
1417 "journaled quota options when "
1421 sbi
->s_jquota_fmt
= qfmt
;
1425 set_opt(sbi
->s_mount_opt
, QUOTA
);
1426 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
1429 set_opt(sbi
->s_mount_opt
, QUOTA
);
1430 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1433 if (sb_any_quota_loaded(sb
)) {
1434 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1435 "options when quota turned on");
1438 clear_opt(sbi
->s_mount_opt
, QUOTA
);
1439 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1440 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1446 ext4_msg(sb
, KERN_ERR
,
1447 "quota options not supported");
1451 case Opt_offusrjquota
:
1452 case Opt_offgrpjquota
:
1453 case Opt_jqfmt_vfsold
:
1454 case Opt_jqfmt_vfsv0
:
1455 ext4_msg(sb
, KERN_ERR
,
1456 "journaled quota options not supported");
1462 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1465 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1468 if (match_int(&args
[0], &option
)) {
1469 set_opt(sbi
->s_mount_opt
, BARRIER
);
1473 set_opt(sbi
->s_mount_opt
, BARRIER
);
1475 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1481 ext4_msg(sb
, KERN_ERR
,
1482 "resize option only available "
1486 if (match_int(&args
[0], &option
) != 0)
1488 *n_blocks_count
= option
;
1491 set_opt(sbi
->s_mount_opt
, NOBH
);
1494 clear_opt(sbi
->s_mount_opt
, NOBH
);
1497 set_opt(sbi
->s_mount_opt
, I_VERSION
);
1498 sb
->s_flags
|= MS_I_VERSION
;
1500 case Opt_nodelalloc
:
1501 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
1504 if (match_int(&args
[0], &option
))
1508 sbi
->s_stripe
= option
;
1511 set_opt(sbi
->s_mount_opt
, DELALLOC
);
1513 case Opt_block_validity
:
1514 set_opt(sbi
->s_mount_opt
, BLOCK_VALIDITY
);
1516 case Opt_noblock_validity
:
1517 clear_opt(sbi
->s_mount_opt
, BLOCK_VALIDITY
);
1519 case Opt_inode_readahead_blks
:
1520 if (match_int(&args
[0], &option
))
1522 if (option
< 0 || option
> (1 << 30))
1524 if (!is_power_of_2(option
)) {
1525 ext4_msg(sb
, KERN_ERR
,
1526 "EXT4-fs: inode_readahead_blks"
1527 " must be a power of 2");
1530 sbi
->s_inode_readahead_blks
= option
;
1532 case Opt_journal_ioprio
:
1533 if (match_int(&args
[0], &option
))
1535 if (option
< 0 || option
> 7)
1537 *journal_ioprio
= IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
,
1540 case Opt_noauto_da_alloc
:
1541 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1543 case Opt_auto_da_alloc
:
1544 if (match_int(&args
[0], &option
)) {
1545 clear_opt(sbi
->s_mount_opt
, NO_AUTO_DA_ALLOC
);
1549 clear_opt(sbi
->s_mount_opt
, NO_AUTO_DA_ALLOC
);
1551 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1554 ext4_msg(sb
, KERN_ERR
,
1555 "Unrecognized mount option \"%s\" "
1556 "or missing value", p
);
1561 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1562 if ((sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
) &&
1563 sbi
->s_qf_names
[USRQUOTA
])
1564 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1566 if ((sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
) &&
1567 sbi
->s_qf_names
[GRPQUOTA
])
1568 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1570 if ((sbi
->s_qf_names
[USRQUOTA
] &&
1571 (sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
)) ||
1572 (sbi
->s_qf_names
[GRPQUOTA
] &&
1573 (sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
))) {
1574 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1579 if (!sbi
->s_jquota_fmt
) {
1580 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1585 if (sbi
->s_jquota_fmt
) {
1586 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1587 "specified with no journaling "
1596 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1599 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1602 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1603 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
1604 "forcing read-only mode");
1609 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1610 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
1611 "running e2fsck is recommended");
1612 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1613 ext4_msg(sb
, KERN_WARNING
,
1614 "warning: mounting fs with errors, "
1615 "running e2fsck is recommended");
1616 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
1617 le16_to_cpu(es
->s_mnt_count
) >=
1618 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1619 ext4_msg(sb
, KERN_WARNING
,
1620 "warning: maximal mount count reached, "
1621 "running e2fsck is recommended");
1622 else if (le32_to_cpu(es
->s_checkinterval
) &&
1623 (le32_to_cpu(es
->s_lastcheck
) +
1624 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1625 ext4_msg(sb
, KERN_WARNING
,
1626 "warning: checktime reached, "
1627 "running e2fsck is recommended");
1628 if (!sbi
->s_journal
)
1629 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1630 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1631 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1632 le16_add_cpu(&es
->s_mnt_count
, 1);
1633 es
->s_mtime
= cpu_to_le32(get_seconds());
1634 ext4_update_dynamic_rev(sb
);
1636 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1638 ext4_commit_super(sb
, 1);
1639 if (test_opt(sb
, DEBUG
))
1640 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
1641 "bpg=%lu, ipg=%lu, mo=%04x]\n",
1643 sbi
->s_groups_count
,
1644 EXT4_BLOCKS_PER_GROUP(sb
),
1645 EXT4_INODES_PER_GROUP(sb
),
1648 if (EXT4_SB(sb
)->s_journal
) {
1649 ext4_msg(sb
, KERN_INFO
, "%s journal on %s",
1650 EXT4_SB(sb
)->s_journal
->j_inode
? "internal" :
1651 "external", EXT4_SB(sb
)->s_journal
->j_devname
);
1653 ext4_msg(sb
, KERN_INFO
, "no journal");
1658 static int ext4_fill_flex_info(struct super_block
*sb
)
1660 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1661 struct ext4_group_desc
*gdp
= NULL
;
1662 ext4_group_t flex_group_count
;
1663 ext4_group_t flex_group
;
1664 int groups_per_flex
= 0;
1668 if (!sbi
->s_es
->s_log_groups_per_flex
) {
1669 sbi
->s_log_groups_per_flex
= 0;
1673 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1674 groups_per_flex
= 1 << sbi
->s_log_groups_per_flex
;
1676 /* We allocate both existing and potentially added groups */
1677 flex_group_count
= ((sbi
->s_groups_count
+ groups_per_flex
- 1) +
1678 ((le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
) + 1) <<
1679 EXT4_DESC_PER_BLOCK_BITS(sb
))) / groups_per_flex
;
1680 size
= flex_group_count
* sizeof(struct flex_groups
);
1681 sbi
->s_flex_groups
= kzalloc(size
, GFP_KERNEL
);
1682 if (sbi
->s_flex_groups
== NULL
) {
1683 sbi
->s_flex_groups
= vmalloc(size
);
1684 if (sbi
->s_flex_groups
)
1685 memset(sbi
->s_flex_groups
, 0, size
);
1687 if (sbi
->s_flex_groups
== NULL
) {
1688 ext4_msg(sb
, KERN_ERR
, "not enough memory for "
1689 "%u flex groups", flex_group_count
);
1693 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1694 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1696 flex_group
= ext4_flex_group(sbi
, i
);
1697 atomic_set(&sbi
->s_flex_groups
[flex_group
].free_inodes
,
1698 ext4_free_inodes_count(sb
, gdp
));
1699 atomic_set(&sbi
->s_flex_groups
[flex_group
].free_blocks
,
1700 ext4_free_blks_count(sb
, gdp
));
1701 atomic_set(&sbi
->s_flex_groups
[flex_group
].used_dirs
,
1702 ext4_used_dirs_count(sb
, gdp
));
1710 __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
1711 struct ext4_group_desc
*gdp
)
1715 if (sbi
->s_es
->s_feature_ro_compat
&
1716 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) {
1717 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
1718 __le32 le_group
= cpu_to_le32(block_group
);
1720 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
1721 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
1722 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
1723 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
1724 /* for checksum of struct ext4_group_desc do the rest...*/
1725 if ((sbi
->s_es
->s_feature_incompat
&
1726 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
1727 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
1728 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
1729 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
1733 return cpu_to_le16(crc
);
1736 int ext4_group_desc_csum_verify(struct ext4_sb_info
*sbi
, __u32 block_group
,
1737 struct ext4_group_desc
*gdp
)
1739 if ((sbi
->s_es
->s_feature_ro_compat
&
1740 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) &&
1741 (gdp
->bg_checksum
!= ext4_group_desc_csum(sbi
, block_group
, gdp
)))
1747 /* Called at mount-time, super-block is locked */
1748 static int ext4_check_descriptors(struct super_block
*sb
)
1750 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1751 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
1752 ext4_fsblk_t last_block
;
1753 ext4_fsblk_t block_bitmap
;
1754 ext4_fsblk_t inode_bitmap
;
1755 ext4_fsblk_t inode_table
;
1756 int flexbg_flag
= 0;
1759 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
1762 ext4_debug("Checking group descriptors");
1764 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1765 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1767 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
1768 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
1770 last_block
= first_block
+
1771 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
1773 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
1774 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
1775 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1776 "Block bitmap for group %u not in group "
1777 "(block %llu)!", i
, block_bitmap
);
1780 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
1781 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
1782 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1783 "Inode bitmap for group %u not in group "
1784 "(block %llu)!", i
, inode_bitmap
);
1787 inode_table
= ext4_inode_table(sb
, gdp
);
1788 if (inode_table
< first_block
||
1789 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
1790 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1791 "Inode table for group %u not in group "
1792 "(block %llu)!", i
, inode_table
);
1795 ext4_lock_group(sb
, i
);
1796 if (!ext4_group_desc_csum_verify(sbi
, i
, gdp
)) {
1797 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1798 "Checksum for group %u failed (%u!=%u)",
1799 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
1800 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
1801 if (!(sb
->s_flags
& MS_RDONLY
)) {
1802 ext4_unlock_group(sb
, i
);
1806 ext4_unlock_group(sb
, i
);
1808 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
1811 ext4_free_blocks_count_set(sbi
->s_es
, ext4_count_free_blocks(sb
));
1812 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
1816 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1817 * the superblock) which were deleted from all directories, but held open by
1818 * a process at the time of a crash. We walk the list and try to delete these
1819 * inodes at recovery time (only with a read-write filesystem).
1821 * In order to keep the orphan inode chain consistent during traversal (in
1822 * case of crash during recovery), we link each inode into the superblock
1823 * orphan list_head and handle it the same way as an inode deletion during
1824 * normal operation (which journals the operations for us).
1826 * We only do an iget() and an iput() on each inode, which is very safe if we
1827 * accidentally point at an in-use or already deleted inode. The worst that
1828 * can happen in this case is that we get a "bit already cleared" message from
1829 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1830 * e2fsck was run on this filesystem, and it must have already done the orphan
1831 * inode cleanup for us, so we can safely abort without any further action.
1833 static void ext4_orphan_cleanup(struct super_block
*sb
,
1834 struct ext4_super_block
*es
)
1836 unsigned int s_flags
= sb
->s_flags
;
1837 int nr_orphans
= 0, nr_truncates
= 0;
1841 if (!es
->s_last_orphan
) {
1842 jbd_debug(4, "no orphan inodes to clean up\n");
1846 if (bdev_read_only(sb
->s_bdev
)) {
1847 ext4_msg(sb
, KERN_ERR
, "write access "
1848 "unavailable, skipping orphan cleanup");
1852 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
1853 if (es
->s_last_orphan
)
1854 jbd_debug(1, "Errors on filesystem, "
1855 "clearing orphan list.\n");
1856 es
->s_last_orphan
= 0;
1857 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1861 if (s_flags
& MS_RDONLY
) {
1862 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
1863 sb
->s_flags
&= ~MS_RDONLY
;
1866 /* Needed for iput() to work correctly and not trash data */
1867 sb
->s_flags
|= MS_ACTIVE
;
1868 /* Turn on quotas so that they are updated correctly */
1869 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1870 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
1871 int ret
= ext4_quota_on_mount(sb
, i
);
1873 ext4_msg(sb
, KERN_ERR
,
1874 "Cannot turn on journaled "
1875 "quota: error %d", ret
);
1880 while (es
->s_last_orphan
) {
1881 struct inode
*inode
;
1883 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
1884 if (IS_ERR(inode
)) {
1885 es
->s_last_orphan
= 0;
1889 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
1891 if (inode
->i_nlink
) {
1892 ext4_msg(sb
, KERN_DEBUG
,
1893 "%s: truncating inode %lu to %lld bytes",
1894 __func__
, inode
->i_ino
, inode
->i_size
);
1895 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
1896 inode
->i_ino
, inode
->i_size
);
1897 ext4_truncate(inode
);
1900 ext4_msg(sb
, KERN_DEBUG
,
1901 "%s: deleting unreferenced inode %lu",
1902 __func__
, inode
->i_ino
);
1903 jbd_debug(2, "deleting unreferenced inode %lu\n",
1907 iput(inode
); /* The delete magic happens here! */
1910 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
1913 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
1914 PLURAL(nr_orphans
));
1916 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
1917 PLURAL(nr_truncates
));
1919 /* Turn quotas off */
1920 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1921 if (sb_dqopt(sb
)->files
[i
])
1922 vfs_quota_off(sb
, i
, 0);
1925 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
1929 * Maximal extent format file size.
1930 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1931 * extent format containers, within a sector_t, and within i_blocks
1932 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1933 * so that won't be a limiting factor.
1935 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1937 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
1940 loff_t upper_limit
= MAX_LFS_FILESIZE
;
1942 /* small i_blocks in vfs inode? */
1943 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
1945 * CONFIG_LBDAF is not enabled implies the inode
1946 * i_block represent total blocks in 512 bytes
1947 * 32 == size of vfs inode i_blocks * 8
1949 upper_limit
= (1LL << 32) - 1;
1951 /* total blocks in file system block size */
1952 upper_limit
>>= (blkbits
- 9);
1953 upper_limit
<<= blkbits
;
1956 /* 32-bit extent-start container, ee_block */
1961 /* Sanity check against vm- & vfs- imposed limits */
1962 if (res
> upper_limit
)
1969 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
1970 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1971 * We need to be 1 filesystem block less than the 2^48 sector limit.
1973 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
1975 loff_t res
= EXT4_NDIR_BLOCKS
;
1978 /* This is calculated to be the largest file size for a dense, block
1979 * mapped file such that the file's total number of 512-byte sectors,
1980 * including data and all indirect blocks, does not exceed (2^48 - 1).
1982 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
1983 * number of 512-byte sectors of the file.
1986 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
1988 * !has_huge_files or CONFIG_LBDAF not enabled implies that
1989 * the inode i_block field represents total file blocks in
1990 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
1992 upper_limit
= (1LL << 32) - 1;
1994 /* total blocks in file system block size */
1995 upper_limit
>>= (bits
- 9);
1999 * We use 48 bit ext4_inode i_blocks
2000 * With EXT4_HUGE_FILE_FL set the i_blocks
2001 * represent total number of blocks in
2002 * file system block size
2004 upper_limit
= (1LL << 48) - 1;
2008 /* indirect blocks */
2010 /* double indirect blocks */
2011 meta_blocks
+= 1 + (1LL << (bits
-2));
2012 /* tripple indirect blocks */
2013 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2015 upper_limit
-= meta_blocks
;
2016 upper_limit
<<= bits
;
2018 res
+= 1LL << (bits
-2);
2019 res
+= 1LL << (2*(bits
-2));
2020 res
+= 1LL << (3*(bits
-2));
2022 if (res
> upper_limit
)
2025 if (res
> MAX_LFS_FILESIZE
)
2026 res
= MAX_LFS_FILESIZE
;
2031 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2032 ext4_fsblk_t logical_sb_block
, int nr
)
2034 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2035 ext4_group_t bg
, first_meta_bg
;
2038 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2040 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
2042 return logical_sb_block
+ nr
+ 1;
2043 bg
= sbi
->s_desc_per_block
* nr
;
2044 if (ext4_bg_has_super(sb
, bg
))
2047 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2051 * ext4_get_stripe_size: Get the stripe size.
2052 * @sbi: In memory super block info
2054 * If we have specified it via mount option, then
2055 * use the mount option value. If the value specified at mount time is
2056 * greater than the blocks per group use the super block value.
2057 * If the super block value is greater than blocks per group return 0.
2058 * Allocator needs it be less than blocks per group.
2061 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2063 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2064 unsigned long stripe_width
=
2065 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2067 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2068 return sbi
->s_stripe
;
2070 if (stripe_width
<= sbi
->s_blocks_per_group
)
2071 return stripe_width
;
2073 if (stride
<= sbi
->s_blocks_per_group
)
2082 struct attribute attr
;
2083 ssize_t (*show
)(struct ext4_attr
*, struct ext4_sb_info
*, char *);
2084 ssize_t (*store
)(struct ext4_attr
*, struct ext4_sb_info
*,
2085 const char *, size_t);
2089 static int parse_strtoul(const char *buf
,
2090 unsigned long max
, unsigned long *value
)
2094 while (*buf
&& isspace(*buf
))
2096 *value
= simple_strtoul(buf
, &endp
, 0);
2097 while (*endp
&& isspace(*endp
))
2099 if (*endp
|| *value
> max
)
2105 static ssize_t
delayed_allocation_blocks_show(struct ext4_attr
*a
,
2106 struct ext4_sb_info
*sbi
,
2109 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2110 (s64
) percpu_counter_sum(&sbi
->s_dirtyblocks_counter
));
2113 static ssize_t
session_write_kbytes_show(struct ext4_attr
*a
,
2114 struct ext4_sb_info
*sbi
, char *buf
)
2116 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2118 return snprintf(buf
, PAGE_SIZE
, "%lu\n",
2119 (part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2120 sbi
->s_sectors_written_start
) >> 1);
2123 static ssize_t
lifetime_write_kbytes_show(struct ext4_attr
*a
,
2124 struct ext4_sb_info
*sbi
, char *buf
)
2126 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2128 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2129 sbi
->s_kbytes_written
+
2130 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2131 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
2134 static ssize_t
inode_readahead_blks_store(struct ext4_attr
*a
,
2135 struct ext4_sb_info
*sbi
,
2136 const char *buf
, size_t count
)
2140 if (parse_strtoul(buf
, 0x40000000, &t
))
2143 if (!is_power_of_2(t
))
2146 sbi
->s_inode_readahead_blks
= t
;
2150 static ssize_t
sbi_ui_show(struct ext4_attr
*a
,
2151 struct ext4_sb_info
*sbi
, char *buf
)
2153 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2155 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
2158 static ssize_t
sbi_ui_store(struct ext4_attr
*a
,
2159 struct ext4_sb_info
*sbi
,
2160 const char *buf
, size_t count
)
2162 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2165 if (parse_strtoul(buf
, 0xffffffff, &t
))
2171 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2172 static struct ext4_attr ext4_attr_##_name = { \
2173 .attr = {.name = __stringify(_name), .mode = _mode }, \
2176 .offset = offsetof(struct ext4_sb_info, _elname), \
2178 #define EXT4_ATTR(name, mode, show, store) \
2179 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2181 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2182 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2183 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2184 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2185 #define ATTR_LIST(name) &ext4_attr_##name.attr
2187 EXT4_RO_ATTR(delayed_allocation_blocks
);
2188 EXT4_RO_ATTR(session_write_kbytes
);
2189 EXT4_RO_ATTR(lifetime_write_kbytes
);
2190 EXT4_ATTR_OFFSET(inode_readahead_blks
, 0644, sbi_ui_show
,
2191 inode_readahead_blks_store
, s_inode_readahead_blks
);
2192 EXT4_RW_ATTR_SBI_UI(inode_goal
, s_inode_goal
);
2193 EXT4_RW_ATTR_SBI_UI(mb_stats
, s_mb_stats
);
2194 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan
, s_mb_max_to_scan
);
2195 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan
, s_mb_min_to_scan
);
2196 EXT4_RW_ATTR_SBI_UI(mb_order2_req
, s_mb_order2_reqs
);
2197 EXT4_RW_ATTR_SBI_UI(mb_stream_req
, s_mb_stream_request
);
2198 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc
, s_mb_group_prealloc
);
2200 static struct attribute
*ext4_attrs
[] = {
2201 ATTR_LIST(delayed_allocation_blocks
),
2202 ATTR_LIST(session_write_kbytes
),
2203 ATTR_LIST(lifetime_write_kbytes
),
2204 ATTR_LIST(inode_readahead_blks
),
2205 ATTR_LIST(inode_goal
),
2206 ATTR_LIST(mb_stats
),
2207 ATTR_LIST(mb_max_to_scan
),
2208 ATTR_LIST(mb_min_to_scan
),
2209 ATTR_LIST(mb_order2_req
),
2210 ATTR_LIST(mb_stream_req
),
2211 ATTR_LIST(mb_group_prealloc
),
2215 static ssize_t
ext4_attr_show(struct kobject
*kobj
,
2216 struct attribute
*attr
, char *buf
)
2218 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2220 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2222 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
2225 static ssize_t
ext4_attr_store(struct kobject
*kobj
,
2226 struct attribute
*attr
,
2227 const char *buf
, size_t len
)
2229 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2231 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2233 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
2236 static void ext4_sb_release(struct kobject
*kobj
)
2238 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2240 complete(&sbi
->s_kobj_unregister
);
2244 static struct sysfs_ops ext4_attr_ops
= {
2245 .show
= ext4_attr_show
,
2246 .store
= ext4_attr_store
,
2249 static struct kobj_type ext4_ktype
= {
2250 .default_attrs
= ext4_attrs
,
2251 .sysfs_ops
= &ext4_attr_ops
,
2252 .release
= ext4_sb_release
,
2256 * Check whether this filesystem can be mounted based on
2257 * the features present and the RDONLY/RDWR mount requested.
2258 * Returns 1 if this filesystem can be mounted as requested,
2259 * 0 if it cannot be.
2261 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2263 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
)) {
2264 ext4_msg(sb
, KERN_ERR
,
2265 "Couldn't mount because of "
2266 "unsupported optional features (%x)",
2267 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2268 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2275 /* Check that feature set is OK for a read-write mount */
2276 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
)) {
2277 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2278 "unsupported optional features (%x)",
2279 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2280 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2284 * Large file size enabled file system can only be mounted
2285 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2287 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
2288 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2289 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2290 "cannot be mounted RDWR without "
2298 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
2299 __releases(kernel_lock
)
2300 __acquires(kernel_lock
)
2302 struct buffer_head
*bh
;
2303 struct ext4_super_block
*es
= NULL
;
2304 struct ext4_sb_info
*sbi
;
2306 ext4_fsblk_t sb_block
= get_sb_block(&data
);
2307 ext4_fsblk_t logical_sb_block
;
2308 unsigned long offset
= 0;
2309 unsigned long journal_devnum
= 0;
2310 unsigned long def_mount_opts
;
2316 unsigned int db_count
;
2318 int needs_recovery
, has_huge_files
;
2321 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
2323 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
2327 sbi
->s_blockgroup_lock
=
2328 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
2329 if (!sbi
->s_blockgroup_lock
) {
2333 sb
->s_fs_info
= sbi
;
2334 sbi
->s_mount_opt
= 0;
2335 sbi
->s_resuid
= EXT4_DEF_RESUID
;
2336 sbi
->s_resgid
= EXT4_DEF_RESGID
;
2337 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
2338 sbi
->s_sb_block
= sb_block
;
2339 sbi
->s_sectors_written_start
= part_stat_read(sb
->s_bdev
->bd_part
,
2344 /* Cleanup superblock name */
2345 for (cp
= sb
->s_id
; (cp
= strchr(cp
, '/'));)
2348 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
2350 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
2355 * The ext4 superblock will not be buffer aligned for other than 1kB
2356 * block sizes. We need to calculate the offset from buffer start.
2358 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
2359 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2360 offset
= do_div(logical_sb_block
, blocksize
);
2362 logical_sb_block
= sb_block
;
2365 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
2366 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
2370 * Note: s_es must be initialized as soon as possible because
2371 * some ext4 macro-instructions depend on its value
2373 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
2375 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
2376 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
2378 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
2380 /* Set defaults before we parse the mount options */
2381 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
2382 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
2383 set_opt(sbi
->s_mount_opt
, DEBUG
);
2384 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
2385 set_opt(sbi
->s_mount_opt
, GRPID
);
2386 if (def_mount_opts
& EXT4_DEFM_UID16
)
2387 set_opt(sbi
->s_mount_opt
, NO_UID32
);
2388 #ifdef CONFIG_EXT4_FS_XATTR
2389 if (def_mount_opts
& EXT4_DEFM_XATTR_USER
)
2390 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
2392 #ifdef CONFIG_EXT4_FS_POSIX_ACL
2393 if (def_mount_opts
& EXT4_DEFM_ACL
)
2394 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
2396 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
2397 sbi
->s_mount_opt
|= EXT4_MOUNT_JOURNAL_DATA
;
2398 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
2399 sbi
->s_mount_opt
|= EXT4_MOUNT_ORDERED_DATA
;
2400 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
2401 sbi
->s_mount_opt
|= EXT4_MOUNT_WRITEBACK_DATA
;
2403 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
2404 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
2405 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
2406 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
2408 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
2410 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
2411 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
2412 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
2413 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
2414 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
2415 sbi
->s_mb_history_max
= default_mb_history_length
;
2417 set_opt(sbi
->s_mount_opt
, BARRIER
);
2420 * enable delayed allocation by default
2421 * Use -o nodelalloc to turn it off
2423 set_opt(sbi
->s_mount_opt
, DELALLOC
);
2425 if (!parse_options((char *) data
, sb
, &journal_devnum
,
2426 &journal_ioprio
, NULL
, 0))
2429 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
2430 ((sbi
->s_mount_opt
& EXT4_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
2432 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
2433 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
2434 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
2435 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
2436 ext4_msg(sb
, KERN_WARNING
,
2437 "feature flags set on rev 0 fs, "
2438 "running e2fsck is recommended");
2441 * Check feature flags regardless of the revision level, since we
2442 * previously didn't change the revision level when setting the flags,
2443 * so there is a chance incompat flags are set on a rev 0 filesystem.
2445 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
2448 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
2450 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
2451 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
2452 ext4_msg(sb
, KERN_ERR
,
2453 "Unsupported filesystem blocksize %d", blocksize
);
2457 if (sb
->s_blocksize
!= blocksize
) {
2458 /* Validate the filesystem blocksize */
2459 if (!sb_set_blocksize(sb
, blocksize
)) {
2460 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
2466 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2467 offset
= do_div(logical_sb_block
, blocksize
);
2468 bh
= sb_bread(sb
, logical_sb_block
);
2470 ext4_msg(sb
, KERN_ERR
,
2471 "Can't read superblock on 2nd try");
2474 es
= (struct ext4_super_block
*)(((char *)bh
->b_data
) + offset
);
2476 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
2477 ext4_msg(sb
, KERN_ERR
,
2478 "Magic mismatch, very weird!");
2483 has_huge_files
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2484 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
);
2485 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
2487 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
2489 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
2490 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
2491 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
2493 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
2494 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
2495 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
2496 (!is_power_of_2(sbi
->s_inode_size
)) ||
2497 (sbi
->s_inode_size
> blocksize
)) {
2498 ext4_msg(sb
, KERN_ERR
,
2499 "unsupported inode size: %d",
2503 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
2504 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
2507 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
2508 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
2509 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
2510 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
2511 !is_power_of_2(sbi
->s_desc_size
)) {
2512 ext4_msg(sb
, KERN_ERR
,
2513 "unsupported descriptor size %lu",
2518 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
2520 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
2521 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
2522 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
2525 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
2526 if (sbi
->s_inodes_per_block
== 0)
2528 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
2529 sbi
->s_inodes_per_block
;
2530 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
2532 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
2533 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
2534 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
2536 for (i
= 0; i
< 4; i
++)
2537 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
2538 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
2539 i
= le32_to_cpu(es
->s_flags
);
2540 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
2541 sbi
->s_hash_unsigned
= 3;
2542 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
2543 #ifdef __CHAR_UNSIGNED__
2544 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
2545 sbi
->s_hash_unsigned
= 3;
2547 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
2552 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
2553 ext4_msg(sb
, KERN_ERR
,
2554 "#blocks per group too big: %lu",
2555 sbi
->s_blocks_per_group
);
2558 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
2559 ext4_msg(sb
, KERN_ERR
,
2560 "#inodes per group too big: %lu",
2561 sbi
->s_inodes_per_group
);
2566 * Test whether we have more sectors than will fit in sector_t,
2567 * and whether the max offset is addressable by the page cache.
2569 if ((ext4_blocks_count(es
) >
2570 (sector_t
)(~0ULL) >> (sb
->s_blocksize_bits
- 9)) ||
2571 (ext4_blocks_count(es
) >
2572 (pgoff_t
)(~0ULL) >> (PAGE_CACHE_SHIFT
- sb
->s_blocksize_bits
))) {
2573 ext4_msg(sb
, KERN_ERR
, "filesystem"
2574 " too large to mount safely on this system");
2575 if (sizeof(sector_t
) < 8)
2576 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
2581 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
2584 /* check blocks count against device size */
2585 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
2586 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
2587 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
2588 "exceeds size of device (%llu blocks)",
2589 ext4_blocks_count(es
), blocks_count
);
2594 * It makes no sense for the first data block to be beyond the end
2595 * of the filesystem.
2597 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
2598 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data"
2599 "block %u is beyond end of filesystem (%llu)",
2600 le32_to_cpu(es
->s_first_data_block
),
2601 ext4_blocks_count(es
));
2604 blocks_count
= (ext4_blocks_count(es
) -
2605 le32_to_cpu(es
->s_first_data_block
) +
2606 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2607 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
2608 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
2609 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
2610 "(block count %llu, first data block %u, "
2611 "blocks per group %lu)", sbi
->s_groups_count
,
2612 ext4_blocks_count(es
),
2613 le32_to_cpu(es
->s_first_data_block
),
2614 EXT4_BLOCKS_PER_GROUP(sb
));
2617 sbi
->s_groups_count
= blocks_count
;
2618 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
2619 EXT4_DESC_PER_BLOCK(sb
);
2620 sbi
->s_group_desc
= kmalloc(db_count
* sizeof(struct buffer_head
*),
2622 if (sbi
->s_group_desc
== NULL
) {
2623 ext4_msg(sb
, KERN_ERR
, "not enough memory");
2627 #ifdef CONFIG_PROC_FS
2629 sbi
->s_proc
= proc_mkdir(sb
->s_id
, ext4_proc_root
);
2632 bgl_lock_init(sbi
->s_blockgroup_lock
);
2634 for (i
= 0; i
< db_count
; i
++) {
2635 block
= descriptor_loc(sb
, logical_sb_block
, i
);
2636 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
2637 if (!sbi
->s_group_desc
[i
]) {
2638 ext4_msg(sb
, KERN_ERR
,
2639 "can't read group descriptor %d", i
);
2644 if (!ext4_check_descriptors(sb
)) {
2645 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
2648 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
2649 if (!ext4_fill_flex_info(sb
)) {
2650 ext4_msg(sb
, KERN_ERR
,
2651 "unable to initialize "
2652 "flex_bg meta info!");
2656 sbi
->s_gdb_count
= db_count
;
2657 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
2658 spin_lock_init(&sbi
->s_next_gen_lock
);
2660 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
2661 ext4_count_free_blocks(sb
));
2663 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
2664 ext4_count_free_inodes(sb
));
2667 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
2668 ext4_count_dirs(sb
));
2671 err
= percpu_counter_init(&sbi
->s_dirtyblocks_counter
, 0);
2674 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
2678 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
2681 * set up enough so that it can read an inode
2683 if (!test_opt(sb
, NOLOAD
) &&
2684 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
2685 sb
->s_op
= &ext4_sops
;
2687 sb
->s_op
= &ext4_nojournal_sops
;
2688 sb
->s_export_op
= &ext4_export_ops
;
2689 sb
->s_xattr
= ext4_xattr_handlers
;
2691 sb
->s_qcop
= &ext4_qctl_operations
;
2692 sb
->dq_op
= &ext4_quota_operations
;
2694 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
2695 mutex_init(&sbi
->s_orphan_lock
);
2696 mutex_init(&sbi
->s_resize_lock
);
2700 needs_recovery
= (es
->s_last_orphan
!= 0 ||
2701 EXT4_HAS_INCOMPAT_FEATURE(sb
,
2702 EXT4_FEATURE_INCOMPAT_RECOVER
));
2705 * The first inode we look at is the journal inode. Don't try
2706 * root first: it may be modified in the journal!
2708 if (!test_opt(sb
, NOLOAD
) &&
2709 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
2710 if (ext4_load_journal(sb
, es
, journal_devnum
))
2712 if (!(sb
->s_flags
& MS_RDONLY
) &&
2713 EXT4_SB(sb
)->s_journal
->j_failed_commit
) {
2714 ext4_msg(sb
, KERN_CRIT
, "error: "
2715 "ext4_fill_super: Journal transaction "
2717 EXT4_SB(sb
)->s_journal
->j_failed_commit
);
2718 if (test_opt(sb
, ERRORS_RO
)) {
2719 ext4_msg(sb
, KERN_CRIT
,
2720 "Mounting filesystem read-only");
2721 sb
->s_flags
|= MS_RDONLY
;
2722 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
2723 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
2725 if (test_opt(sb
, ERRORS_PANIC
)) {
2726 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
2727 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
2728 ext4_commit_super(sb
, 1);
2732 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
2733 EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
2734 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
2735 "suppressed and not mounted read-only");
2738 clear_opt(sbi
->s_mount_opt
, DATA_FLAGS
);
2739 set_opt(sbi
->s_mount_opt
, WRITEBACK_DATA
);
2740 sbi
->s_journal
= NULL
;
2745 if (ext4_blocks_count(es
) > 0xffffffffULL
&&
2746 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
2747 JBD2_FEATURE_INCOMPAT_64BIT
)) {
2748 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
2752 jbd2_journal_set_features(sbi
->s_journal
,
2753 JBD2_FEATURE_COMPAT_CHECKSUM
, 0, 0);
2754 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
))
2755 jbd2_journal_set_features(sbi
->s_journal
, 0, 0,
2756 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2758 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
2759 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2761 /* We have now updated the journal if required, so we can
2762 * validate the data journaling mode. */
2763 switch (test_opt(sb
, DATA_FLAGS
)) {
2765 /* No mode set, assume a default based on the journal
2766 * capabilities: ORDERED_DATA if the journal can
2767 * cope, else JOURNAL_DATA
2769 if (jbd2_journal_check_available_features
2770 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
2771 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
2773 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
2776 case EXT4_MOUNT_ORDERED_DATA
:
2777 case EXT4_MOUNT_WRITEBACK_DATA
:
2778 if (!jbd2_journal_check_available_features
2779 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
2780 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
2781 "requested data journaling mode");
2787 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
2791 if (test_opt(sb
, NOBH
)) {
2792 if (!(test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)) {
2793 ext4_msg(sb
, KERN_WARNING
, "Ignoring nobh option - "
2794 "its supported only with writeback mode");
2795 clear_opt(sbi
->s_mount_opt
, NOBH
);
2799 * The jbd2_journal_load will have done any necessary log recovery,
2800 * so we can safely mount the rest of the filesystem now.
2803 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
2805 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
2806 ret
= PTR_ERR(root
);
2809 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
2811 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
2814 sb
->s_root
= d_alloc_root(root
);
2816 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
2822 ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
);
2824 /* determine the minimum size of new large inodes, if present */
2825 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
2826 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2827 EXT4_GOOD_OLD_INODE_SIZE
;
2828 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2829 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
2830 if (sbi
->s_want_extra_isize
<
2831 le16_to_cpu(es
->s_want_extra_isize
))
2832 sbi
->s_want_extra_isize
=
2833 le16_to_cpu(es
->s_want_extra_isize
);
2834 if (sbi
->s_want_extra_isize
<
2835 le16_to_cpu(es
->s_min_extra_isize
))
2836 sbi
->s_want_extra_isize
=
2837 le16_to_cpu(es
->s_min_extra_isize
);
2840 /* Check if enough inode space is available */
2841 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
2842 sbi
->s_inode_size
) {
2843 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2844 EXT4_GOOD_OLD_INODE_SIZE
;
2845 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
2849 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
2850 ext4_msg(sb
, KERN_WARNING
, "Ignoring delalloc option - "
2851 "requested data journaling mode");
2852 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
2853 } else if (test_opt(sb
, DELALLOC
))
2854 ext4_msg(sb
, KERN_INFO
, "delayed allocation enabled");
2856 err
= ext4_setup_system_zone(sb
);
2858 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
2859 "zone (%d)\n", err
);
2864 err
= ext4_mb_init(sb
, needs_recovery
);
2866 ext4_msg(sb
, KERN_ERR
, "failed to initalize mballoc (%d)",
2871 sbi
->s_kobj
.kset
= ext4_kset
;
2872 init_completion(&sbi
->s_kobj_unregister
);
2873 err
= kobject_init_and_add(&sbi
->s_kobj
, &ext4_ktype
, NULL
,
2876 ext4_mb_release(sb
);
2877 ext4_ext_release(sb
);
2881 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
2882 ext4_orphan_cleanup(sb
, es
);
2883 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
2884 if (needs_recovery
) {
2885 ext4_msg(sb
, KERN_INFO
, "recovery complete");
2886 ext4_mark_recovery_complete(sb
, es
);
2888 if (EXT4_SB(sb
)->s_journal
) {
2889 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
2890 descr
= " journalled data mode";
2891 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
2892 descr
= " ordered data mode";
2894 descr
= " writeback data mode";
2896 descr
= "out journal";
2898 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s", descr
);
2905 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
2909 ext4_msg(sb
, KERN_ERR
, "mount failed");
2910 ext4_release_system_zone(sb
);
2911 if (sbi
->s_journal
) {
2912 jbd2_journal_destroy(sbi
->s_journal
);
2913 sbi
->s_journal
= NULL
;
2916 if (sbi
->s_flex_groups
) {
2917 if (is_vmalloc_addr(sbi
->s_flex_groups
))
2918 vfree(sbi
->s_flex_groups
);
2920 kfree(sbi
->s_flex_groups
);
2922 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
2923 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
2924 percpu_counter_destroy(&sbi
->s_dirs_counter
);
2925 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
2927 for (i
= 0; i
< db_count
; i
++)
2928 brelse(sbi
->s_group_desc
[i
]);
2929 kfree(sbi
->s_group_desc
);
2932 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
2935 for (i
= 0; i
< MAXQUOTAS
; i
++)
2936 kfree(sbi
->s_qf_names
[i
]);
2938 ext4_blkdev_remove(sbi
);
2941 sb
->s_fs_info
= NULL
;
2942 kfree(sbi
->s_blockgroup_lock
);
2949 * Setup any per-fs journal parameters now. We'll do this both on
2950 * initial mount, once the journal has been initialised but before we've
2951 * done any recovery; and again on any subsequent remount.
2953 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
2955 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2957 journal
->j_commit_interval
= sbi
->s_commit_interval
;
2958 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
2959 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
2961 spin_lock(&journal
->j_state_lock
);
2962 if (test_opt(sb
, BARRIER
))
2963 journal
->j_flags
|= JBD2_BARRIER
;
2965 journal
->j_flags
&= ~JBD2_BARRIER
;
2966 if (test_opt(sb
, DATA_ERR_ABORT
))
2967 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
2969 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
2970 spin_unlock(&journal
->j_state_lock
);
2973 static journal_t
*ext4_get_journal(struct super_block
*sb
,
2974 unsigned int journal_inum
)
2976 struct inode
*journal_inode
;
2979 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
2981 /* First, test for the existence of a valid inode on disk. Bad
2982 * things happen if we iget() an unused inode, as the subsequent
2983 * iput() will try to delete it. */
2985 journal_inode
= ext4_iget(sb
, journal_inum
);
2986 if (IS_ERR(journal_inode
)) {
2987 ext4_msg(sb
, KERN_ERR
, "no journal found");
2990 if (!journal_inode
->i_nlink
) {
2991 make_bad_inode(journal_inode
);
2992 iput(journal_inode
);
2993 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
2997 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
2998 journal_inode
, journal_inode
->i_size
);
2999 if (!S_ISREG(journal_inode
->i_mode
)) {
3000 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
3001 iput(journal_inode
);
3005 journal
= jbd2_journal_init_inode(journal_inode
);
3007 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
3008 iput(journal_inode
);
3011 journal
->j_private
= sb
;
3012 ext4_init_journal_params(sb
, journal
);
3016 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
3019 struct buffer_head
*bh
;
3023 int hblock
, blocksize
;
3024 ext4_fsblk_t sb_block
;
3025 unsigned long offset
;
3026 struct ext4_super_block
*es
;
3027 struct block_device
*bdev
;
3029 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3031 bdev
= ext4_blkdev_get(j_dev
, sb
);
3035 if (bd_claim(bdev
, sb
)) {
3036 ext4_msg(sb
, KERN_ERR
,
3037 "failed to claim external journal device");
3038 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
3042 blocksize
= sb
->s_blocksize
;
3043 hblock
= bdev_logical_block_size(bdev
);
3044 if (blocksize
< hblock
) {
3045 ext4_msg(sb
, KERN_ERR
,
3046 "blocksize too small for journal device");
3050 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
3051 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
3052 set_blocksize(bdev
, blocksize
);
3053 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
3054 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
3055 "external journal");
3059 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
3060 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
3061 !(le32_to_cpu(es
->s_feature_incompat
) &
3062 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
3063 ext4_msg(sb
, KERN_ERR
, "external journal has "
3069 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
3070 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
3075 len
= ext4_blocks_count(es
);
3076 start
= sb_block
+ 1;
3077 brelse(bh
); /* we're done with the superblock */
3079 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
3080 start
, len
, blocksize
);
3082 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
3085 journal
->j_private
= sb
;
3086 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
3087 wait_on_buffer(journal
->j_sb_buffer
);
3088 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
3089 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
3092 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
3093 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
3094 "user (unsupported) - %d",
3095 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
3098 EXT4_SB(sb
)->journal_bdev
= bdev
;
3099 ext4_init_journal_params(sb
, journal
);
3103 jbd2_journal_destroy(journal
);
3105 ext4_blkdev_put(bdev
);
3109 static int ext4_load_journal(struct super_block
*sb
,
3110 struct ext4_super_block
*es
,
3111 unsigned long journal_devnum
)
3114 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
3117 int really_read_only
;
3119 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3121 if (journal_devnum
&&
3122 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3123 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
3124 "numbers have changed");
3125 journal_dev
= new_decode_dev(journal_devnum
);
3127 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
3129 really_read_only
= bdev_read_only(sb
->s_bdev
);
3132 * Are we loading a blank journal or performing recovery after a
3133 * crash? For recovery, we need to check in advance whether we
3134 * can get read-write access to the device.
3136 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3137 if (sb
->s_flags
& MS_RDONLY
) {
3138 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
3139 "required on readonly filesystem");
3140 if (really_read_only
) {
3141 ext4_msg(sb
, KERN_ERR
, "write access "
3142 "unavailable, cannot proceed");
3145 ext4_msg(sb
, KERN_INFO
, "write access will "
3146 "be enabled during recovery");
3150 if (journal_inum
&& journal_dev
) {
3151 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
3152 "and inode journals!");
3157 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
3160 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
3164 if (journal
->j_flags
& JBD2_BARRIER
)
3165 ext4_msg(sb
, KERN_INFO
, "barriers enabled");
3167 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
3169 if (!really_read_only
&& test_opt(sb
, UPDATE_JOURNAL
)) {
3170 err
= jbd2_journal_update_format(journal
);
3172 ext4_msg(sb
, KERN_ERR
, "error updating journal");
3173 jbd2_journal_destroy(journal
);
3178 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
3179 err
= jbd2_journal_wipe(journal
, !really_read_only
);
3181 err
= jbd2_journal_load(journal
);
3184 ext4_msg(sb
, KERN_ERR
, "error loading journal");
3185 jbd2_journal_destroy(journal
);
3189 EXT4_SB(sb
)->s_journal
= journal
;
3190 ext4_clear_journal_err(sb
, es
);
3192 if (journal_devnum
&&
3193 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3194 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
3196 /* Make sure we flush the recovery flag to disk. */
3197 ext4_commit_super(sb
, 1);
3203 static int ext4_commit_super(struct super_block
*sb
, int sync
)
3205 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
3206 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
3211 if (buffer_write_io_error(sbh
)) {
3213 * Oh, dear. A previous attempt to write the
3214 * superblock failed. This could happen because the
3215 * USB device was yanked out. Or it could happen to
3216 * be a transient write error and maybe the block will
3217 * be remapped. Nothing we can do but to retry the
3218 * write and hope for the best.
3220 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
3221 "superblock detected");
3222 clear_buffer_write_io_error(sbh
);
3223 set_buffer_uptodate(sbh
);
3225 es
->s_wtime
= cpu_to_le32(get_seconds());
3226 es
->s_kbytes_written
=
3227 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
3228 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
3229 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
3230 ext4_free_blocks_count_set(es
, percpu_counter_sum_positive(
3231 &EXT4_SB(sb
)->s_freeblocks_counter
));
3232 es
->s_free_inodes_count
= cpu_to_le32(percpu_counter_sum_positive(
3233 &EXT4_SB(sb
)->s_freeinodes_counter
));
3235 BUFFER_TRACE(sbh
, "marking dirty");
3236 mark_buffer_dirty(sbh
);
3238 error
= sync_dirty_buffer(sbh
);
3242 error
= buffer_write_io_error(sbh
);
3244 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
3246 clear_buffer_write_io_error(sbh
);
3247 set_buffer_uptodate(sbh
);
3254 * Have we just finished recovery? If so, and if we are mounting (or
3255 * remounting) the filesystem readonly, then we will end up with a
3256 * consistent fs on disk. Record that fact.
3258 static void ext4_mark_recovery_complete(struct super_block
*sb
,
3259 struct ext4_super_block
*es
)
3261 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
3263 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
3264 BUG_ON(journal
!= NULL
);
3267 jbd2_journal_lock_updates(journal
);
3268 if (jbd2_journal_flush(journal
) < 0)
3271 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
3272 sb
->s_flags
& MS_RDONLY
) {
3273 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3274 ext4_commit_super(sb
, 1);
3278 jbd2_journal_unlock_updates(journal
);
3282 * If we are mounting (or read-write remounting) a filesystem whose journal
3283 * has recorded an error from a previous lifetime, move that error to the
3284 * main filesystem now.
3286 static void ext4_clear_journal_err(struct super_block
*sb
,
3287 struct ext4_super_block
*es
)
3293 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3295 journal
= EXT4_SB(sb
)->s_journal
;
3298 * Now check for any error status which may have been recorded in the
3299 * journal by a prior ext4_error() or ext4_abort()
3302 j_errno
= jbd2_journal_errno(journal
);
3306 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
3307 ext4_warning(sb
, __func__
, "Filesystem error recorded "
3308 "from previous mount: %s", errstr
);
3309 ext4_warning(sb
, __func__
, "Marking fs in need of "
3310 "filesystem check.");
3312 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
3313 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
3314 ext4_commit_super(sb
, 1);
3316 jbd2_journal_clear_err(journal
);
3321 * Force the running and committing transactions to commit,
3322 * and wait on the commit.
3324 int ext4_force_commit(struct super_block
*sb
)
3329 if (sb
->s_flags
& MS_RDONLY
)
3332 journal
= EXT4_SB(sb
)->s_journal
;
3334 ret
= ext4_journal_force_commit(journal
);
3339 static void ext4_write_super(struct super_block
*sb
)
3342 ext4_commit_super(sb
, 1);
3346 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
3351 trace_ext4_sync_fs(sb
, wait
);
3352 if (jbd2_journal_start_commit(EXT4_SB(sb
)->s_journal
, &target
)) {
3354 jbd2_log_wait_commit(EXT4_SB(sb
)->s_journal
, target
);
3360 * LVM calls this function before a (read-only) snapshot is created. This
3361 * gives us a chance to flush the journal completely and mark the fs clean.
3363 static int ext4_freeze(struct super_block
*sb
)
3368 if (sb
->s_flags
& MS_RDONLY
)
3371 journal
= EXT4_SB(sb
)->s_journal
;
3373 /* Now we set up the journal barrier. */
3374 jbd2_journal_lock_updates(journal
);
3377 * Don't clear the needs_recovery flag if we failed to flush
3380 error
= jbd2_journal_flush(journal
);
3383 jbd2_journal_unlock_updates(journal
);
3387 /* Journal blocked and flushed, clear needs_recovery flag. */
3388 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3389 error
= ext4_commit_super(sb
, 1);
3396 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3397 * flag here, even though the filesystem is not technically dirty yet.
3399 static int ext4_unfreeze(struct super_block
*sb
)
3401 if (sb
->s_flags
& MS_RDONLY
)
3405 /* Reset the needs_recovery flag before the fs is unlocked. */
3406 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3407 ext4_commit_super(sb
, 1);
3409 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
3413 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
3415 struct ext4_super_block
*es
;
3416 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3417 ext4_fsblk_t n_blocks_count
= 0;
3418 unsigned long old_sb_flags
;
3419 struct ext4_mount_options old_opts
;
3421 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3429 /* Store the original options */
3431 old_sb_flags
= sb
->s_flags
;
3432 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
3433 old_opts
.s_resuid
= sbi
->s_resuid
;
3434 old_opts
.s_resgid
= sbi
->s_resgid
;
3435 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
3436 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
3437 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
3439 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
3440 for (i
= 0; i
< MAXQUOTAS
; i
++)
3441 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
3443 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
3444 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
3447 * Allow the "check" option to be passed as a remount option.
3449 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
,
3450 &n_blocks_count
, 1)) {
3455 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
3456 ext4_abort(sb
, __func__
, "Abort forced by user");
3458 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3459 ((sbi
->s_mount_opt
& EXT4_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
3463 if (sbi
->s_journal
) {
3464 ext4_init_journal_params(sb
, sbi
->s_journal
);
3465 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
3468 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
) ||
3469 n_blocks_count
> ext4_blocks_count(es
)) {
3470 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
3475 if (*flags
& MS_RDONLY
) {
3477 * First of all, the unconditional stuff we have to do
3478 * to disable replay of the journal when we next remount
3480 sb
->s_flags
|= MS_RDONLY
;
3483 * OK, test if we are remounting a valid rw partition
3484 * readonly, and if so set the rdonly flag and then
3485 * mark the partition as valid again.
3487 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
3488 (sbi
->s_mount_state
& EXT4_VALID_FS
))
3489 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
3492 ext4_mark_recovery_complete(sb
, es
);
3494 /* Make sure we can mount this feature set readwrite */
3495 if (!ext4_feature_set_ok(sb
, 0)) {
3500 * Make sure the group descriptor checksums
3501 * are sane. If they aren't, refuse to remount r/w.
3503 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
3504 struct ext4_group_desc
*gdp
=
3505 ext4_get_group_desc(sb
, g
, NULL
);
3507 if (!ext4_group_desc_csum_verify(sbi
, g
, gdp
)) {
3508 ext4_msg(sb
, KERN_ERR
,
3509 "ext4_remount: Checksum for group %u failed (%u!=%u)",
3510 g
, le16_to_cpu(ext4_group_desc_csum(sbi
, g
, gdp
)),
3511 le16_to_cpu(gdp
->bg_checksum
));
3518 * If we have an unprocessed orphan list hanging
3519 * around from a previously readonly bdev mount,
3520 * require a full umount/remount for now.
3522 if (es
->s_last_orphan
) {
3523 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
3524 "remount RDWR because of unprocessed "
3525 "orphan inode list. Please "
3526 "umount/remount instead");
3532 * Mounting a RDONLY partition read-write, so reread
3533 * and store the current valid flag. (It may have
3534 * been changed by e2fsck since we originally mounted
3538 ext4_clear_journal_err(sb
, es
);
3539 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3540 if ((err
= ext4_group_extend(sb
, es
, n_blocks_count
)))
3542 if (!ext4_setup_super(sb
, es
, 0))
3543 sb
->s_flags
&= ~MS_RDONLY
;
3546 ext4_setup_system_zone(sb
);
3547 if (sbi
->s_journal
== NULL
)
3548 ext4_commit_super(sb
, 1);
3551 /* Release old quota file names */
3552 for (i
= 0; i
< MAXQUOTAS
; i
++)
3553 if (old_opts
.s_qf_names
[i
] &&
3554 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3555 kfree(old_opts
.s_qf_names
[i
]);
3562 sb
->s_flags
= old_sb_flags
;
3563 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
3564 sbi
->s_resuid
= old_opts
.s_resuid
;
3565 sbi
->s_resgid
= old_opts
.s_resgid
;
3566 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
3567 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
3568 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
3570 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
3571 for (i
= 0; i
< MAXQUOTAS
; i
++) {
3572 if (sbi
->s_qf_names
[i
] &&
3573 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3574 kfree(sbi
->s_qf_names
[i
]);
3575 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
3583 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
3585 struct super_block
*sb
= dentry
->d_sb
;
3586 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3587 struct ext4_super_block
*es
= sbi
->s_es
;
3590 if (test_opt(sb
, MINIX_DF
)) {
3591 sbi
->s_overhead_last
= 0;
3592 } else if (sbi
->s_blocks_last
!= ext4_blocks_count(es
)) {
3593 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3594 ext4_fsblk_t overhead
= 0;
3597 * Compute the overhead (FS structures). This is constant
3598 * for a given filesystem unless the number of block groups
3599 * changes so we cache the previous value until it does.
3603 * All of the blocks before first_data_block are
3606 overhead
= le32_to_cpu(es
->s_first_data_block
);
3609 * Add the overhead attributed to the superblock and
3610 * block group descriptors. If the sparse superblocks
3611 * feature is turned on, then not all groups have this.
3613 for (i
= 0; i
< ngroups
; i
++) {
3614 overhead
+= ext4_bg_has_super(sb
, i
) +
3615 ext4_bg_num_gdb(sb
, i
);
3620 * Every block group has an inode bitmap, a block
3621 * bitmap, and an inode table.
3623 overhead
+= ngroups
* (2 + sbi
->s_itb_per_group
);
3624 sbi
->s_overhead_last
= overhead
;
3626 sbi
->s_blocks_last
= ext4_blocks_count(es
);
3629 buf
->f_type
= EXT4_SUPER_MAGIC
;
3630 buf
->f_bsize
= sb
->s_blocksize
;
3631 buf
->f_blocks
= ext4_blocks_count(es
) - sbi
->s_overhead_last
;
3632 buf
->f_bfree
= percpu_counter_sum_positive(&sbi
->s_freeblocks_counter
) -
3633 percpu_counter_sum_positive(&sbi
->s_dirtyblocks_counter
);
3634 ext4_free_blocks_count_set(es
, buf
->f_bfree
);
3635 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
3636 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
3638 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
3639 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
3640 es
->s_free_inodes_count
= cpu_to_le32(buf
->f_ffree
);
3641 buf
->f_namelen
= EXT4_NAME_LEN
;
3642 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
3643 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
3644 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
3645 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
3650 /* Helper function for writing quotas on sync - we need to start transaction
3651 * before quota file is locked for write. Otherwise the are possible deadlocks:
3652 * Process 1 Process 2
3653 * ext4_create() quota_sync()
3654 * jbd2_journal_start() write_dquot()
3655 * vfs_dq_init() down(dqio_mutex)
3656 * down(dqio_mutex) jbd2_journal_start()
3662 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
3664 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_type
];
3667 static int ext4_write_dquot(struct dquot
*dquot
)
3671 struct inode
*inode
;
3673 inode
= dquot_to_inode(dquot
);
3674 handle
= ext4_journal_start(inode
,
3675 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
3677 return PTR_ERR(handle
);
3678 ret
= dquot_commit(dquot
);
3679 err
= ext4_journal_stop(handle
);
3685 static int ext4_acquire_dquot(struct dquot
*dquot
)
3690 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3691 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
3693 return PTR_ERR(handle
);
3694 ret
= dquot_acquire(dquot
);
3695 err
= ext4_journal_stop(handle
);
3701 static int ext4_release_dquot(struct dquot
*dquot
)
3706 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3707 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
3708 if (IS_ERR(handle
)) {
3709 /* Release dquot anyway to avoid endless cycle in dqput() */
3710 dquot_release(dquot
);
3711 return PTR_ERR(handle
);
3713 ret
= dquot_release(dquot
);
3714 err
= ext4_journal_stop(handle
);
3720 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
3722 /* Are we journaling quotas? */
3723 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
3724 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
3725 dquot_mark_dquot_dirty(dquot
);
3726 return ext4_write_dquot(dquot
);
3728 return dquot_mark_dquot_dirty(dquot
);
3732 static int ext4_write_info(struct super_block
*sb
, int type
)
3737 /* Data block + inode block */
3738 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
3740 return PTR_ERR(handle
);
3741 ret
= dquot_commit_info(sb
, type
);
3742 err
= ext4_journal_stop(handle
);
3749 * Turn on quotas during mount time - we need to find
3750 * the quota file and such...
3752 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
3754 return vfs_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
3755 EXT4_SB(sb
)->s_jquota_fmt
, type
);
3759 * Standard function to be called on quota_on
3761 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
3762 char *name
, int remount
)
3767 if (!test_opt(sb
, QUOTA
))
3769 /* When remounting, no checks are needed and in fact, name is NULL */
3771 return vfs_quota_on(sb
, type
, format_id
, name
, remount
);
3773 err
= kern_path(name
, LOOKUP_FOLLOW
, &path
);
3777 /* Quotafile not on the same filesystem? */
3778 if (path
.mnt
->mnt_sb
!= sb
) {
3782 /* Journaling quota? */
3783 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
3784 /* Quotafile not in fs root? */
3785 if (path
.dentry
->d_parent
!= sb
->s_root
)
3786 ext4_msg(sb
, KERN_WARNING
,
3787 "Quota file not on filesystem root. "
3788 "Journaled quota will not work");
3792 * When we journal data on quota file, we have to flush journal to see
3793 * all updates to the file when we bypass pagecache...
3795 if (EXT4_SB(sb
)->s_journal
&&
3796 ext4_should_journal_data(path
.dentry
->d_inode
)) {
3798 * We don't need to lock updates but journal_flush() could
3799 * otherwise be livelocked...
3801 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
3802 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
3803 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
3810 err
= vfs_quota_on_path(sb
, type
, format_id
, &path
);
3815 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3816 * acquiring the locks... As quota files are never truncated and quota code
3817 * itself serializes the operations (and noone else should touch the files)
3818 * we don't have to be afraid of races */
3819 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
3820 size_t len
, loff_t off
)
3822 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
3823 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
3825 int offset
= off
& (sb
->s_blocksize
- 1);
3828 struct buffer_head
*bh
;
3829 loff_t i_size
= i_size_read(inode
);
3833 if (off
+len
> i_size
)
3836 while (toread
> 0) {
3837 tocopy
= sb
->s_blocksize
- offset
< toread
?
3838 sb
->s_blocksize
- offset
: toread
;
3839 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
3842 if (!bh
) /* A hole? */
3843 memset(data
, 0, tocopy
);
3845 memcpy(data
, bh
->b_data
+offset
, tocopy
);
3855 /* Write to quotafile (we know the transaction is already started and has
3856 * enough credits) */
3857 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
3858 const char *data
, size_t len
, loff_t off
)
3860 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
3861 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
3863 int offset
= off
& (sb
->s_blocksize
- 1);
3865 int journal_quota
= EXT4_SB(sb
)->s_qf_names
[type
] != NULL
;
3866 size_t towrite
= len
;
3867 struct buffer_head
*bh
;
3868 handle_t
*handle
= journal_current_handle();
3870 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
3871 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
3872 " cancelled because transaction is not started",
3873 (unsigned long long)off
, (unsigned long long)len
);
3876 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
3877 while (towrite
> 0) {
3878 tocopy
= sb
->s_blocksize
- offset
< towrite
?
3879 sb
->s_blocksize
- offset
: towrite
;
3880 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
3883 if (journal_quota
) {
3884 err
= ext4_journal_get_write_access(handle
, bh
);
3891 memcpy(bh
->b_data
+offset
, data
, tocopy
);
3892 flush_dcache_page(bh
->b_page
);
3895 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
3897 /* Always do at least ordered writes for quotas */
3898 err
= ext4_jbd2_file_inode(handle
, inode
);
3899 mark_buffer_dirty(bh
);
3910 if (len
== towrite
) {
3911 mutex_unlock(&inode
->i_mutex
);
3914 if (inode
->i_size
< off
+len
-towrite
) {
3915 i_size_write(inode
, off
+len
-towrite
);
3916 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
3918 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
3919 ext4_mark_inode_dirty(handle
, inode
);
3920 mutex_unlock(&inode
->i_mutex
);
3921 return len
- towrite
;
3926 static int ext4_get_sb(struct file_system_type
*fs_type
, int flags
,
3927 const char *dev_name
, void *data
, struct vfsmount
*mnt
)
3929 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
,mnt
);
3932 static struct file_system_type ext4_fs_type
= {
3933 .owner
= THIS_MODULE
,
3935 .get_sb
= ext4_get_sb
,
3936 .kill_sb
= kill_block_super
,
3937 .fs_flags
= FS_REQUIRES_DEV
,
3940 #ifdef CONFIG_EXT4DEV_COMPAT
3941 static int ext4dev_get_sb(struct file_system_type
*fs_type
, int flags
,
3942 const char *dev_name
, void *data
,struct vfsmount
*mnt
)
3944 printk(KERN_WARNING
"EXT4-fs (%s): Update your userspace programs "
3945 "to mount using ext4\n", dev_name
);
3946 printk(KERN_WARNING
"EXT4-fs (%s): ext4dev backwards compatibility "
3947 "will go away by 2.6.31\n", dev_name
);
3948 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
,mnt
);
3951 static struct file_system_type ext4dev_fs_type
= {
3952 .owner
= THIS_MODULE
,
3954 .get_sb
= ext4dev_get_sb
,
3955 .kill_sb
= kill_block_super
,
3956 .fs_flags
= FS_REQUIRES_DEV
,
3958 MODULE_ALIAS("ext4dev");
3961 static int __init
init_ext4_fs(void)
3965 err
= init_ext4_system_zone();
3968 ext4_kset
= kset_create_and_add("ext4", NULL
, fs_kobj
);
3971 ext4_proc_root
= proc_mkdir("fs/ext4", NULL
);
3972 err
= init_ext4_mballoc();
3976 err
= init_ext4_xattr();
3979 err
= init_inodecache();
3982 err
= register_filesystem(&ext4_fs_type
);
3985 #ifdef CONFIG_EXT4DEV_COMPAT
3986 err
= register_filesystem(&ext4dev_fs_type
);
3988 unregister_filesystem(&ext4_fs_type
);
3994 destroy_inodecache();
3998 exit_ext4_mballoc();
4000 remove_proc_entry("fs/ext4", NULL
);
4001 kset_unregister(ext4_kset
);
4003 exit_ext4_system_zone();
4007 static void __exit
exit_ext4_fs(void)
4009 unregister_filesystem(&ext4_fs_type
);
4010 #ifdef CONFIG_EXT4DEV_COMPAT
4011 unregister_filesystem(&ext4dev_fs_type
);
4013 destroy_inodecache();
4015 exit_ext4_mballoc();
4016 remove_proc_entry("fs/ext4", NULL
);
4017 kset_unregister(ext4_kset
);
4018 exit_ext4_system_zone();
4021 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4022 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4023 MODULE_LICENSE("GPL");
4024 module_init(init_ext4_fs
)
4025 module_exit(exit_ext4_fs
)