2 * linux/fs/ext4/super.c
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
11 * linux/fs/minix/inode.c
13 * Copyright (C) 1991, 1992 Linus Torvalds
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
19 #include <linux/module.h>
20 #include <linux/string.h>
22 #include <linux/time.h>
23 #include <linux/vmalloc.h>
24 #include <linux/jbd2.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/blkdev.h>
28 #include <linux/parser.h>
29 #include <linux/smp_lock.h>
30 #include <linux/buffer_head.h>
31 #include <linux/exportfs.h>
32 #include <linux/vfs.h>
33 #include <linux/random.h>
34 #include <linux/mount.h>
35 #include <linux/namei.h>
36 #include <linux/quotaops.h>
37 #include <linux/seq_file.h>
38 #include <linux/proc_fs.h>
39 #include <linux/ctype.h>
40 #include <linux/log2.h>
41 #include <linux/crc16.h>
42 #include <asm/uaccess.h>
45 #include "ext4_jbd2.h"
50 #define CREATE_TRACE_POINTS
51 #include <trace/events/ext4.h>
53 struct proc_dir_entry
*ext4_proc_root
;
54 static struct kset
*ext4_kset
;
56 static int ext4_load_journal(struct super_block
*, struct ext4_super_block
*,
57 unsigned long journal_devnum
);
58 static int ext4_commit_super(struct super_block
*sb
, int sync
);
59 static void ext4_mark_recovery_complete(struct super_block
*sb
,
60 struct ext4_super_block
*es
);
61 static void ext4_clear_journal_err(struct super_block
*sb
,
62 struct ext4_super_block
*es
);
63 static int ext4_sync_fs(struct super_block
*sb
, int wait
);
64 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
66 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
);
67 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
);
68 static int ext4_unfreeze(struct super_block
*sb
);
69 static void ext4_write_super(struct super_block
*sb
);
70 static int ext4_freeze(struct super_block
*sb
);
73 ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
74 struct ext4_group_desc
*bg
)
76 return le32_to_cpu(bg
->bg_block_bitmap_lo
) |
77 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
78 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
81 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
82 struct ext4_group_desc
*bg
)
84 return le32_to_cpu(bg
->bg_inode_bitmap_lo
) |
85 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
86 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
89 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
90 struct ext4_group_desc
*bg
)
92 return le32_to_cpu(bg
->bg_inode_table_lo
) |
93 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
94 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
97 __u32
ext4_free_blks_count(struct super_block
*sb
,
98 struct ext4_group_desc
*bg
)
100 return le16_to_cpu(bg
->bg_free_blocks_count_lo
) |
101 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
102 (__u32
)le16_to_cpu(bg
->bg_free_blocks_count_hi
) << 16 : 0);
105 __u32
ext4_free_inodes_count(struct super_block
*sb
,
106 struct ext4_group_desc
*bg
)
108 return le16_to_cpu(bg
->bg_free_inodes_count_lo
) |
109 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
110 (__u32
)le16_to_cpu(bg
->bg_free_inodes_count_hi
) << 16 : 0);
113 __u32
ext4_used_dirs_count(struct super_block
*sb
,
114 struct ext4_group_desc
*bg
)
116 return le16_to_cpu(bg
->bg_used_dirs_count_lo
) |
117 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
118 (__u32
)le16_to_cpu(bg
->bg_used_dirs_count_hi
) << 16 : 0);
121 __u32
ext4_itable_unused_count(struct super_block
*sb
,
122 struct ext4_group_desc
*bg
)
124 return le16_to_cpu(bg
->bg_itable_unused_lo
) |
125 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
126 (__u32
)le16_to_cpu(bg
->bg_itable_unused_hi
) << 16 : 0);
129 void ext4_block_bitmap_set(struct super_block
*sb
,
130 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
132 bg
->bg_block_bitmap_lo
= cpu_to_le32((u32
)blk
);
133 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
134 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
137 void ext4_inode_bitmap_set(struct super_block
*sb
,
138 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
140 bg
->bg_inode_bitmap_lo
= cpu_to_le32((u32
)blk
);
141 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
142 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
145 void ext4_inode_table_set(struct super_block
*sb
,
146 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
148 bg
->bg_inode_table_lo
= cpu_to_le32((u32
)blk
);
149 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
150 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
153 void ext4_free_blks_set(struct super_block
*sb
,
154 struct ext4_group_desc
*bg
, __u32 count
)
156 bg
->bg_free_blocks_count_lo
= cpu_to_le16((__u16
)count
);
157 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
158 bg
->bg_free_blocks_count_hi
= cpu_to_le16(count
>> 16);
161 void ext4_free_inodes_set(struct super_block
*sb
,
162 struct ext4_group_desc
*bg
, __u32 count
)
164 bg
->bg_free_inodes_count_lo
= cpu_to_le16((__u16
)count
);
165 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
166 bg
->bg_free_inodes_count_hi
= cpu_to_le16(count
>> 16);
169 void ext4_used_dirs_set(struct super_block
*sb
,
170 struct ext4_group_desc
*bg
, __u32 count
)
172 bg
->bg_used_dirs_count_lo
= cpu_to_le16((__u16
)count
);
173 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
174 bg
->bg_used_dirs_count_hi
= cpu_to_le16(count
>> 16);
177 void ext4_itable_unused_set(struct super_block
*sb
,
178 struct ext4_group_desc
*bg
, __u32 count
)
180 bg
->bg_itable_unused_lo
= cpu_to_le16((__u16
)count
);
181 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
182 bg
->bg_itable_unused_hi
= cpu_to_le16(count
>> 16);
186 /* Just increment the non-pointer handle value */
187 static handle_t
*ext4_get_nojournal(void)
189 handle_t
*handle
= current
->journal_info
;
190 unsigned long ref_cnt
= (unsigned long)handle
;
192 BUG_ON(ref_cnt
>= EXT4_NOJOURNAL_MAX_REF_COUNT
);
195 handle
= (handle_t
*)ref_cnt
;
197 current
->journal_info
= handle
;
202 /* Decrement the non-pointer handle value */
203 static void ext4_put_nojournal(handle_t
*handle
)
205 unsigned long ref_cnt
= (unsigned long)handle
;
207 BUG_ON(ref_cnt
== 0);
210 handle
= (handle_t
*)ref_cnt
;
212 current
->journal_info
= handle
;
216 * Wrappers for jbd2_journal_start/end.
218 * The only special thing we need to do here is to make sure that all
219 * journal_end calls result in the superblock being marked dirty, so
220 * that sync() will call the filesystem's write_super callback if
223 handle_t
*ext4_journal_start_sb(struct super_block
*sb
, int nblocks
)
227 if (sb
->s_flags
& MS_RDONLY
)
228 return ERR_PTR(-EROFS
);
230 /* Special case here: if the journal has aborted behind our
231 * backs (eg. EIO in the commit thread), then we still need to
232 * take the FS itself readonly cleanly. */
233 journal
= EXT4_SB(sb
)->s_journal
;
235 if (is_journal_aborted(journal
)) {
236 ext4_abort(sb
, __func__
, "Detected aborted journal");
237 return ERR_PTR(-EROFS
);
239 return jbd2_journal_start(journal
, nblocks
);
241 return ext4_get_nojournal();
245 * The only special thing we need to do here is to make sure that all
246 * jbd2_journal_stop calls result in the superblock being marked dirty, so
247 * that sync() will call the filesystem's write_super callback if
250 int __ext4_journal_stop(const char *where
, handle_t
*handle
)
252 struct super_block
*sb
;
256 if (!ext4_handle_valid(handle
)) {
257 ext4_put_nojournal(handle
);
260 sb
= handle
->h_transaction
->t_journal
->j_private
;
262 rc
= jbd2_journal_stop(handle
);
267 __ext4_std_error(sb
, where
, err
);
271 void ext4_journal_abort_handle(const char *caller
, const char *err_fn
,
272 struct buffer_head
*bh
, handle_t
*handle
, int err
)
275 const char *errstr
= ext4_decode_error(NULL
, err
, nbuf
);
277 BUG_ON(!ext4_handle_valid(handle
));
280 BUFFER_TRACE(bh
, "abort");
285 if (is_handle_aborted(handle
))
288 printk(KERN_ERR
"%s: aborting transaction: %s in %s\n",
289 caller
, errstr
, err_fn
);
291 jbd2_journal_abort_handle(handle
);
294 /* Deal with the reporting of failure conditions on a filesystem such as
295 * inconsistencies detected or read IO failures.
297 * On ext2, we can store the error state of the filesystem in the
298 * superblock. That is not possible on ext4, because we may have other
299 * write ordering constraints on the superblock which prevent us from
300 * writing it out straight away; and given that the journal is about to
301 * be aborted, we can't rely on the current, or future, transactions to
302 * write out the superblock safely.
304 * We'll just use the jbd2_journal_abort() error code to record an error in
305 * the journal instead. On recovery, the journal will compain about
306 * that error until we've noted it down and cleared it.
309 static void ext4_handle_error(struct super_block
*sb
)
311 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
313 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
314 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
316 if (sb
->s_flags
& MS_RDONLY
)
319 if (!test_opt(sb
, ERRORS_CONT
)) {
320 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
322 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
324 jbd2_journal_abort(journal
, -EIO
);
326 if (test_opt(sb
, ERRORS_RO
)) {
327 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
328 sb
->s_flags
|= MS_RDONLY
;
330 ext4_commit_super(sb
, 1);
331 if (test_opt(sb
, ERRORS_PANIC
))
332 panic("EXT4-fs (device %s): panic forced after error\n",
336 void ext4_error(struct super_block
*sb
, const char *function
,
337 const char *fmt
, ...)
342 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
347 ext4_handle_error(sb
);
350 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
357 errstr
= "IO failure";
360 errstr
= "Out of memory";
363 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
364 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
365 errstr
= "Journal has aborted";
367 errstr
= "Readonly filesystem";
370 /* If the caller passed in an extra buffer for unknown
371 * errors, textualise them now. Else we just return
374 /* Check for truncated error codes... */
375 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
384 /* __ext4_std_error decodes expected errors from journaling functions
385 * automatically and invokes the appropriate error response. */
387 void __ext4_std_error(struct super_block
*sb
, const char *function
, int errno
)
392 /* Special case: if the error is EROFS, and we're not already
393 * inside a transaction, then there's really no point in logging
395 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
396 (sb
->s_flags
& MS_RDONLY
))
399 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
400 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s: %s\n",
401 sb
->s_id
, function
, errstr
);
403 ext4_handle_error(sb
);
407 * ext4_abort is a much stronger failure handler than ext4_error. The
408 * abort function may be used to deal with unrecoverable failures such
409 * as journal IO errors or ENOMEM at a critical moment in log management.
411 * We unconditionally force the filesystem into an ABORT|READONLY state,
412 * unless the error response on the fs has been set to panic in which
413 * case we take the easy way out and panic immediately.
416 void ext4_abort(struct super_block
*sb
, const char *function
,
417 const char *fmt
, ...)
422 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
427 if (test_opt(sb
, ERRORS_PANIC
))
428 panic("EXT4-fs panic from previous error\n");
430 if (sb
->s_flags
& MS_RDONLY
)
433 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
434 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
435 sb
->s_flags
|= MS_RDONLY
;
436 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
437 if (EXT4_SB(sb
)->s_journal
)
438 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
441 void ext4_msg (struct super_block
* sb
, const char *prefix
,
442 const char *fmt
, ...)
447 printk("%sEXT4-fs (%s): ", prefix
, sb
->s_id
);
453 void ext4_warning(struct super_block
*sb
, const char *function
,
454 const char *fmt
, ...)
459 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s: ",
466 void ext4_grp_locked_error(struct super_block
*sb
, ext4_group_t grp
,
467 const char *function
, const char *fmt
, ...)
472 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
475 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
480 if (test_opt(sb
, ERRORS_CONT
)) {
481 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
482 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
483 ext4_commit_super(sb
, 0);
486 ext4_unlock_group(sb
, grp
);
487 ext4_handle_error(sb
);
489 * We only get here in the ERRORS_RO case; relocking the group
490 * may be dangerous, but nothing bad will happen since the
491 * filesystem will have already been marked read/only and the
492 * journal has been aborted. We return 1 as a hint to callers
493 * who might what to use the return value from
494 * ext4_grp_locked_error() to distinguish beween the
495 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
496 * aggressively from the ext4 function in question, with a
497 * more appropriate error code.
499 ext4_lock_group(sb
, grp
);
503 void ext4_update_dynamic_rev(struct super_block
*sb
)
505 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
507 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
510 ext4_warning(sb
, __func__
,
511 "updating to rev %d because of new feature flag, "
512 "running e2fsck is recommended",
515 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
516 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
517 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
518 /* leave es->s_feature_*compat flags alone */
519 /* es->s_uuid will be set by e2fsck if empty */
522 * The rest of the superblock fields should be zero, and if not it
523 * means they are likely already in use, so leave them alone. We
524 * can leave it up to e2fsck to clean up any inconsistencies there.
529 * Open the external journal device
531 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
533 struct block_device
*bdev
;
534 char b
[BDEVNAME_SIZE
];
536 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
542 ext4_msg(sb
, KERN_ERR
, "failed to open journal device %s: %ld",
543 __bdevname(dev
, b
), PTR_ERR(bdev
));
548 * Release the journal device
550 static int ext4_blkdev_put(struct block_device
*bdev
)
553 return blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
556 static int ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
558 struct block_device
*bdev
;
561 bdev
= sbi
->journal_bdev
;
563 ret
= ext4_blkdev_put(bdev
);
564 sbi
->journal_bdev
= NULL
;
569 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
571 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
574 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
578 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
579 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
581 printk(KERN_ERR
"sb_info orphan list:\n");
582 list_for_each(l
, &sbi
->s_orphan
) {
583 struct inode
*inode
= orphan_list_entry(l
);
585 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
586 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
587 inode
->i_mode
, inode
->i_nlink
,
592 static void ext4_put_super(struct super_block
*sb
)
594 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
595 struct ext4_super_block
*es
= sbi
->s_es
;
598 flush_workqueue(sbi
->dio_unwritten_wq
);
599 destroy_workqueue(sbi
->dio_unwritten_wq
);
604 ext4_commit_super(sb
, 1);
606 if (sbi
->s_journal
) {
607 err
= jbd2_journal_destroy(sbi
->s_journal
);
608 sbi
->s_journal
= NULL
;
610 ext4_abort(sb
, __func__
,
611 "Couldn't clean up the journal");
614 ext4_release_system_zone(sb
);
616 ext4_ext_release(sb
);
617 ext4_xattr_put_super(sb
);
619 if (!(sb
->s_flags
& MS_RDONLY
)) {
620 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
621 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
622 ext4_commit_super(sb
, 1);
625 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
627 kobject_del(&sbi
->s_kobj
);
629 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
630 brelse(sbi
->s_group_desc
[i
]);
631 kfree(sbi
->s_group_desc
);
632 if (is_vmalloc_addr(sbi
->s_flex_groups
))
633 vfree(sbi
->s_flex_groups
);
635 kfree(sbi
->s_flex_groups
);
636 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
637 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
638 percpu_counter_destroy(&sbi
->s_dirs_counter
);
639 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
642 for (i
= 0; i
< MAXQUOTAS
; i
++)
643 kfree(sbi
->s_qf_names
[i
]);
646 /* Debugging code just in case the in-memory inode orphan list
647 * isn't empty. The on-disk one can be non-empty if we've
648 * detected an error and taken the fs readonly, but the
649 * in-memory list had better be clean by this point. */
650 if (!list_empty(&sbi
->s_orphan
))
651 dump_orphan_list(sb
, sbi
);
652 J_ASSERT(list_empty(&sbi
->s_orphan
));
654 invalidate_bdev(sb
->s_bdev
);
655 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
657 * Invalidate the journal device's buffers. We don't want them
658 * floating about in memory - the physical journal device may
659 * hotswapped, and it breaks the `ro-after' testing code.
661 sync_blockdev(sbi
->journal_bdev
);
662 invalidate_bdev(sbi
->journal_bdev
);
663 ext4_blkdev_remove(sbi
);
665 sb
->s_fs_info
= NULL
;
667 * Now that we are completely done shutting down the
668 * superblock, we need to actually destroy the kobject.
672 kobject_put(&sbi
->s_kobj
);
673 wait_for_completion(&sbi
->s_kobj_unregister
);
674 kfree(sbi
->s_blockgroup_lock
);
678 static struct kmem_cache
*ext4_inode_cachep
;
681 * Called inside transaction, so use GFP_NOFS
683 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
685 struct ext4_inode_info
*ei
;
687 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
691 ei
->vfs_inode
.i_version
= 1;
692 ei
->vfs_inode
.i_data
.writeback_index
= 0;
693 memset(&ei
->i_cached_extent
, 0, sizeof(struct ext4_ext_cache
));
694 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
695 spin_lock_init(&ei
->i_prealloc_lock
);
697 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
698 * therefore it can be null here. Don't check it, just initialize
701 jbd2_journal_init_jbd_inode(&ei
->jinode
, &ei
->vfs_inode
);
702 ei
->i_reserved_data_blocks
= 0;
703 ei
->i_reserved_meta_blocks
= 0;
704 ei
->i_allocated_meta_blocks
= 0;
705 ei
->i_delalloc_reserved_flag
= 0;
706 spin_lock_init(&(ei
->i_block_reservation_lock
));
708 ei
->i_reserved_quota
= 0;
710 INIT_LIST_HEAD(&ei
->i_aio_dio_complete_list
);
711 ei
->cur_aio_dio
= NULL
;
713 ei
->i_datasync_tid
= 0;
715 return &ei
->vfs_inode
;
718 static void ext4_destroy_inode(struct inode
*inode
)
720 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
721 ext4_msg(inode
->i_sb
, KERN_ERR
,
722 "Inode %lu (%p): orphan list check failed!",
723 inode
->i_ino
, EXT4_I(inode
));
724 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
725 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
729 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
732 static void init_once(void *foo
)
734 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
736 INIT_LIST_HEAD(&ei
->i_orphan
);
737 #ifdef CONFIG_EXT4_FS_XATTR
738 init_rwsem(&ei
->xattr_sem
);
740 init_rwsem(&ei
->i_data_sem
);
741 inode_init_once(&ei
->vfs_inode
);
744 static int init_inodecache(void)
746 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
747 sizeof(struct ext4_inode_info
),
748 0, (SLAB_RECLAIM_ACCOUNT
|
751 if (ext4_inode_cachep
== NULL
)
756 static void destroy_inodecache(void)
758 kmem_cache_destroy(ext4_inode_cachep
);
761 static void ext4_clear_inode(struct inode
*inode
)
763 ext4_discard_preallocations(inode
);
764 if (EXT4_JOURNAL(inode
))
765 jbd2_journal_release_jbd_inode(EXT4_SB(inode
->i_sb
)->s_journal
,
766 &EXT4_I(inode
)->jinode
);
769 static inline void ext4_show_quota_options(struct seq_file
*seq
,
770 struct super_block
*sb
)
772 #if defined(CONFIG_QUOTA)
773 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
775 if (sbi
->s_jquota_fmt
) {
778 switch (sbi
->s_jquota_fmt
) {
789 seq_printf(seq
, ",jqfmt=%s", fmtname
);
792 if (sbi
->s_qf_names
[USRQUOTA
])
793 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
795 if (sbi
->s_qf_names
[GRPQUOTA
])
796 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
798 if (sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
)
799 seq_puts(seq
, ",usrquota");
801 if (sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
)
802 seq_puts(seq
, ",grpquota");
808 * - it's set to a non-default value OR
809 * - if the per-sb default is different from the global default
811 static int ext4_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
814 unsigned long def_mount_opts
;
815 struct super_block
*sb
= vfs
->mnt_sb
;
816 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
817 struct ext4_super_block
*es
= sbi
->s_es
;
819 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
820 def_errors
= le16_to_cpu(es
->s_errors
);
822 if (sbi
->s_sb_block
!= 1)
823 seq_printf(seq
, ",sb=%llu", sbi
->s_sb_block
);
824 if (test_opt(sb
, MINIX_DF
))
825 seq_puts(seq
, ",minixdf");
826 if (test_opt(sb
, GRPID
) && !(def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
827 seq_puts(seq
, ",grpid");
828 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
829 seq_puts(seq
, ",nogrpid");
830 if (sbi
->s_resuid
!= EXT4_DEF_RESUID
||
831 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
) {
832 seq_printf(seq
, ",resuid=%u", sbi
->s_resuid
);
834 if (sbi
->s_resgid
!= EXT4_DEF_RESGID
||
835 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
) {
836 seq_printf(seq
, ",resgid=%u", sbi
->s_resgid
);
838 if (test_opt(sb
, ERRORS_RO
)) {
839 if (def_errors
== EXT4_ERRORS_PANIC
||
840 def_errors
== EXT4_ERRORS_CONTINUE
) {
841 seq_puts(seq
, ",errors=remount-ro");
844 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
845 seq_puts(seq
, ",errors=continue");
846 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
847 seq_puts(seq
, ",errors=panic");
848 if (test_opt(sb
, NO_UID32
) && !(def_mount_opts
& EXT4_DEFM_UID16
))
849 seq_puts(seq
, ",nouid32");
850 if (test_opt(sb
, DEBUG
) && !(def_mount_opts
& EXT4_DEFM_DEBUG
))
851 seq_puts(seq
, ",debug");
852 if (test_opt(sb
, OLDALLOC
))
853 seq_puts(seq
, ",oldalloc");
854 #ifdef CONFIG_EXT4_FS_XATTR
855 if (test_opt(sb
, XATTR_USER
) &&
856 !(def_mount_opts
& EXT4_DEFM_XATTR_USER
))
857 seq_puts(seq
, ",user_xattr");
858 if (!test_opt(sb
, XATTR_USER
) &&
859 (def_mount_opts
& EXT4_DEFM_XATTR_USER
)) {
860 seq_puts(seq
, ",nouser_xattr");
863 #ifdef CONFIG_EXT4_FS_POSIX_ACL
864 if (test_opt(sb
, POSIX_ACL
) && !(def_mount_opts
& EXT4_DEFM_ACL
))
865 seq_puts(seq
, ",acl");
866 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT4_DEFM_ACL
))
867 seq_puts(seq
, ",noacl");
869 if (sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
) {
870 seq_printf(seq
, ",commit=%u",
871 (unsigned) (sbi
->s_commit_interval
/ HZ
));
873 if (sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
) {
874 seq_printf(seq
, ",min_batch_time=%u",
875 (unsigned) sbi
->s_min_batch_time
);
877 if (sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
) {
878 seq_printf(seq
, ",max_batch_time=%u",
879 (unsigned) sbi
->s_min_batch_time
);
883 * We're changing the default of barrier mount option, so
884 * let's always display its mount state so it's clear what its
887 seq_puts(seq
, ",barrier=");
888 seq_puts(seq
, test_opt(sb
, BARRIER
) ? "1" : "0");
889 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
))
890 seq_puts(seq
, ",journal_async_commit");
891 if (test_opt(sb
, NOBH
))
892 seq_puts(seq
, ",nobh");
893 if (test_opt(sb
, I_VERSION
))
894 seq_puts(seq
, ",i_version");
895 if (!test_opt(sb
, DELALLOC
))
896 seq_puts(seq
, ",nodelalloc");
900 seq_printf(seq
, ",stripe=%lu", sbi
->s_stripe
);
902 * journal mode get enabled in different ways
903 * So just print the value even if we didn't specify it
905 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
906 seq_puts(seq
, ",data=journal");
907 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
908 seq_puts(seq
, ",data=ordered");
909 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
910 seq_puts(seq
, ",data=writeback");
912 if (sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
913 seq_printf(seq
, ",inode_readahead_blks=%u",
914 sbi
->s_inode_readahead_blks
);
916 if (test_opt(sb
, DATA_ERR_ABORT
))
917 seq_puts(seq
, ",data_err=abort");
919 if (test_opt(sb
, NO_AUTO_DA_ALLOC
))
920 seq_puts(seq
, ",noauto_da_alloc");
922 if (test_opt(sb
, DISCARD
))
923 seq_puts(seq
, ",discard");
925 if (test_opt(sb
, NOLOAD
))
926 seq_puts(seq
, ",norecovery");
928 ext4_show_quota_options(seq
, sb
);
933 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
934 u64 ino
, u32 generation
)
938 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
939 return ERR_PTR(-ESTALE
);
940 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
941 return ERR_PTR(-ESTALE
);
943 /* iget isn't really right if the inode is currently unallocated!!
945 * ext4_read_inode will return a bad_inode if the inode had been
946 * deleted, so we should be safe.
948 * Currently we don't know the generation for parent directory, so
949 * a generation of 0 means "accept any"
951 inode
= ext4_iget(sb
, ino
);
953 return ERR_CAST(inode
);
954 if (generation
&& inode
->i_generation
!= generation
) {
956 return ERR_PTR(-ESTALE
);
962 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
963 int fh_len
, int fh_type
)
965 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
969 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
970 int fh_len
, int fh_type
)
972 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
977 * Try to release metadata pages (indirect blocks, directories) which are
978 * mapped via the block device. Since these pages could have journal heads
979 * which would prevent try_to_free_buffers() from freeing them, we must use
980 * jbd2 layer's try_to_free_buffers() function to release them.
982 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
985 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
987 WARN_ON(PageChecked(page
));
988 if (!page_has_buffers(page
))
991 return jbd2_journal_try_to_free_buffers(journal
, page
,
993 return try_to_free_buffers(page
);
997 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
998 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1000 static int ext4_write_dquot(struct dquot
*dquot
);
1001 static int ext4_acquire_dquot(struct dquot
*dquot
);
1002 static int ext4_release_dquot(struct dquot
*dquot
);
1003 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1004 static int ext4_write_info(struct super_block
*sb
, int type
);
1005 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1006 char *path
, int remount
);
1007 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1008 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1009 size_t len
, loff_t off
);
1010 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1011 const char *data
, size_t len
, loff_t off
);
1013 static const struct dquot_operations ext4_quota_operations
= {
1014 .initialize
= dquot_initialize
,
1016 .alloc_space
= dquot_alloc_space
,
1017 .reserve_space
= dquot_reserve_space
,
1018 .claim_space
= dquot_claim_space
,
1019 .release_rsv
= dquot_release_reserved_space
,
1021 .get_reserved_space
= ext4_get_reserved_space
,
1023 .alloc_inode
= dquot_alloc_inode
,
1024 .free_space
= dquot_free_space
,
1025 .free_inode
= dquot_free_inode
,
1026 .transfer
= dquot_transfer
,
1027 .write_dquot
= ext4_write_dquot
,
1028 .acquire_dquot
= ext4_acquire_dquot
,
1029 .release_dquot
= ext4_release_dquot
,
1030 .mark_dirty
= ext4_mark_dquot_dirty
,
1031 .write_info
= ext4_write_info
,
1032 .alloc_dquot
= dquot_alloc
,
1033 .destroy_dquot
= dquot_destroy
,
1036 static const struct quotactl_ops ext4_qctl_operations
= {
1037 .quota_on
= ext4_quota_on
,
1038 .quota_off
= vfs_quota_off
,
1039 .quota_sync
= vfs_quota_sync
,
1040 .get_info
= vfs_get_dqinfo
,
1041 .set_info
= vfs_set_dqinfo
,
1042 .get_dqblk
= vfs_get_dqblk
,
1043 .set_dqblk
= vfs_set_dqblk
1047 static const struct super_operations ext4_sops
= {
1048 .alloc_inode
= ext4_alloc_inode
,
1049 .destroy_inode
= ext4_destroy_inode
,
1050 .write_inode
= ext4_write_inode
,
1051 .dirty_inode
= ext4_dirty_inode
,
1052 .delete_inode
= ext4_delete_inode
,
1053 .put_super
= ext4_put_super
,
1054 .sync_fs
= ext4_sync_fs
,
1055 .freeze_fs
= ext4_freeze
,
1056 .unfreeze_fs
= ext4_unfreeze
,
1057 .statfs
= ext4_statfs
,
1058 .remount_fs
= ext4_remount
,
1059 .clear_inode
= ext4_clear_inode
,
1060 .show_options
= ext4_show_options
,
1062 .quota_read
= ext4_quota_read
,
1063 .quota_write
= ext4_quota_write
,
1065 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1068 static const struct super_operations ext4_nojournal_sops
= {
1069 .alloc_inode
= ext4_alloc_inode
,
1070 .destroy_inode
= ext4_destroy_inode
,
1071 .write_inode
= ext4_write_inode
,
1072 .dirty_inode
= ext4_dirty_inode
,
1073 .delete_inode
= ext4_delete_inode
,
1074 .write_super
= ext4_write_super
,
1075 .put_super
= ext4_put_super
,
1076 .statfs
= ext4_statfs
,
1077 .remount_fs
= ext4_remount
,
1078 .clear_inode
= ext4_clear_inode
,
1079 .show_options
= ext4_show_options
,
1081 .quota_read
= ext4_quota_read
,
1082 .quota_write
= ext4_quota_write
,
1084 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1087 static const struct export_operations ext4_export_ops
= {
1088 .fh_to_dentry
= ext4_fh_to_dentry
,
1089 .fh_to_parent
= ext4_fh_to_parent
,
1090 .get_parent
= ext4_get_parent
,
1094 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1095 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1096 Opt_nouid32
, Opt_debug
, Opt_oldalloc
, Opt_orlov
,
1097 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1098 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
, Opt_nobh
, Opt_bh
,
1099 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
,
1100 Opt_journal_update
, Opt_journal_dev
,
1101 Opt_journal_checksum
, Opt_journal_async_commit
,
1102 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1103 Opt_data_err_abort
, Opt_data_err_ignore
,
1104 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1105 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1106 Opt_noquota
, Opt_ignore
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1107 Opt_resize
, Opt_usrquota
, Opt_grpquota
, Opt_i_version
,
1108 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
,
1109 Opt_block_validity
, Opt_noblock_validity
,
1110 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1111 Opt_discard
, Opt_nodiscard
,
1114 static const match_table_t tokens
= {
1115 {Opt_bsd_df
, "bsddf"},
1116 {Opt_minix_df
, "minixdf"},
1117 {Opt_grpid
, "grpid"},
1118 {Opt_grpid
, "bsdgroups"},
1119 {Opt_nogrpid
, "nogrpid"},
1120 {Opt_nogrpid
, "sysvgroups"},
1121 {Opt_resgid
, "resgid=%u"},
1122 {Opt_resuid
, "resuid=%u"},
1124 {Opt_err_cont
, "errors=continue"},
1125 {Opt_err_panic
, "errors=panic"},
1126 {Opt_err_ro
, "errors=remount-ro"},
1127 {Opt_nouid32
, "nouid32"},
1128 {Opt_debug
, "debug"},
1129 {Opt_oldalloc
, "oldalloc"},
1130 {Opt_orlov
, "orlov"},
1131 {Opt_user_xattr
, "user_xattr"},
1132 {Opt_nouser_xattr
, "nouser_xattr"},
1134 {Opt_noacl
, "noacl"},
1135 {Opt_noload
, "noload"},
1136 {Opt_noload
, "norecovery"},
1139 {Opt_commit
, "commit=%u"},
1140 {Opt_min_batch_time
, "min_batch_time=%u"},
1141 {Opt_max_batch_time
, "max_batch_time=%u"},
1142 {Opt_journal_update
, "journal=update"},
1143 {Opt_journal_dev
, "journal_dev=%u"},
1144 {Opt_journal_checksum
, "journal_checksum"},
1145 {Opt_journal_async_commit
, "journal_async_commit"},
1146 {Opt_abort
, "abort"},
1147 {Opt_data_journal
, "data=journal"},
1148 {Opt_data_ordered
, "data=ordered"},
1149 {Opt_data_writeback
, "data=writeback"},
1150 {Opt_data_err_abort
, "data_err=abort"},
1151 {Opt_data_err_ignore
, "data_err=ignore"},
1152 {Opt_offusrjquota
, "usrjquota="},
1153 {Opt_usrjquota
, "usrjquota=%s"},
1154 {Opt_offgrpjquota
, "grpjquota="},
1155 {Opt_grpjquota
, "grpjquota=%s"},
1156 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1157 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1158 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1159 {Opt_grpquota
, "grpquota"},
1160 {Opt_noquota
, "noquota"},
1161 {Opt_quota
, "quota"},
1162 {Opt_usrquota
, "usrquota"},
1163 {Opt_barrier
, "barrier=%u"},
1164 {Opt_barrier
, "barrier"},
1165 {Opt_nobarrier
, "nobarrier"},
1166 {Opt_i_version
, "i_version"},
1167 {Opt_stripe
, "stripe=%u"},
1168 {Opt_resize
, "resize"},
1169 {Opt_delalloc
, "delalloc"},
1170 {Opt_nodelalloc
, "nodelalloc"},
1171 {Opt_block_validity
, "block_validity"},
1172 {Opt_noblock_validity
, "noblock_validity"},
1173 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1174 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1175 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1176 {Opt_auto_da_alloc
, "auto_da_alloc"},
1177 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1178 {Opt_discard
, "discard"},
1179 {Opt_nodiscard
, "nodiscard"},
1183 static ext4_fsblk_t
get_sb_block(void **data
)
1185 ext4_fsblk_t sb_block
;
1186 char *options
= (char *) *data
;
1188 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1189 return 1; /* Default location */
1192 /* TODO: use simple_strtoll with >32bit ext4 */
1193 sb_block
= simple_strtoul(options
, &options
, 0);
1194 if (*options
&& *options
!= ',') {
1195 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1199 if (*options
== ',')
1201 *data
= (void *) options
;
1206 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1208 static int parse_options(char *options
, struct super_block
*sb
,
1209 unsigned long *journal_devnum
,
1210 unsigned int *journal_ioprio
,
1211 ext4_fsblk_t
*n_blocks_count
, int is_remount
)
1213 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1215 substring_t args
[MAX_OPT_ARGS
];
1226 while ((p
= strsep(&options
, ",")) != NULL
) {
1231 token
= match_token(p
, tokens
, args
);
1234 clear_opt(sbi
->s_mount_opt
, MINIX_DF
);
1237 set_opt(sbi
->s_mount_opt
, MINIX_DF
);
1240 set_opt(sbi
->s_mount_opt
, GRPID
);
1243 clear_opt(sbi
->s_mount_opt
, GRPID
);
1246 if (match_int(&args
[0], &option
))
1248 sbi
->s_resuid
= option
;
1251 if (match_int(&args
[0], &option
))
1253 sbi
->s_resgid
= option
;
1256 /* handled by get_sb_block() instead of here */
1257 /* *sb_block = match_int(&args[0]); */
1260 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1261 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1262 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1265 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1266 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1267 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1270 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1271 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1272 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1275 set_opt(sbi
->s_mount_opt
, NO_UID32
);
1278 set_opt(sbi
->s_mount_opt
, DEBUG
);
1281 set_opt(sbi
->s_mount_opt
, OLDALLOC
);
1284 clear_opt(sbi
->s_mount_opt
, OLDALLOC
);
1286 #ifdef CONFIG_EXT4_FS_XATTR
1287 case Opt_user_xattr
:
1288 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
1290 case Opt_nouser_xattr
:
1291 clear_opt(sbi
->s_mount_opt
, XATTR_USER
);
1294 case Opt_user_xattr
:
1295 case Opt_nouser_xattr
:
1296 ext4_msg(sb
, KERN_ERR
, "(no)user_xattr options not supported");
1299 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1301 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1304 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1309 ext4_msg(sb
, KERN_ERR
, "(no)acl options not supported");
1312 case Opt_journal_update
:
1314 /* Eventually we will want to be able to create
1315 a journal file here. For now, only allow the
1316 user to specify an existing inode to be the
1319 ext4_msg(sb
, KERN_ERR
,
1320 "Cannot specify journal on remount");
1323 set_opt(sbi
->s_mount_opt
, UPDATE_JOURNAL
);
1325 case Opt_journal_dev
:
1327 ext4_msg(sb
, KERN_ERR
,
1328 "Cannot specify journal on remount");
1331 if (match_int(&args
[0], &option
))
1333 *journal_devnum
= option
;
1335 case Opt_journal_checksum
:
1336 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1338 case Opt_journal_async_commit
:
1339 set_opt(sbi
->s_mount_opt
, JOURNAL_ASYNC_COMMIT
);
1340 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1343 set_opt(sbi
->s_mount_opt
, NOLOAD
);
1346 if (match_int(&args
[0], &option
))
1351 option
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1352 sbi
->s_commit_interval
= HZ
* option
;
1354 case Opt_max_batch_time
:
1355 if (match_int(&args
[0], &option
))
1360 option
= EXT4_DEF_MAX_BATCH_TIME
;
1361 sbi
->s_max_batch_time
= option
;
1363 case Opt_min_batch_time
:
1364 if (match_int(&args
[0], &option
))
1368 sbi
->s_min_batch_time
= option
;
1370 case Opt_data_journal
:
1371 data_opt
= EXT4_MOUNT_JOURNAL_DATA
;
1373 case Opt_data_ordered
:
1374 data_opt
= EXT4_MOUNT_ORDERED_DATA
;
1376 case Opt_data_writeback
:
1377 data_opt
= EXT4_MOUNT_WRITEBACK_DATA
;
1380 if ((sbi
->s_mount_opt
& EXT4_MOUNT_DATA_FLAGS
)
1382 ext4_msg(sb
, KERN_ERR
,
1383 "Cannot change data mode on remount");
1387 sbi
->s_mount_opt
&= ~EXT4_MOUNT_DATA_FLAGS
;
1388 sbi
->s_mount_opt
|= data_opt
;
1391 case Opt_data_err_abort
:
1392 set_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1394 case Opt_data_err_ignore
:
1395 clear_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1404 if (sb_any_quota_loaded(sb
) &&
1405 !sbi
->s_qf_names
[qtype
]) {
1406 ext4_msg(sb
, KERN_ERR
,
1407 "Cannot change journaled "
1408 "quota options when quota turned on");
1411 qname
= match_strdup(&args
[0]);
1413 ext4_msg(sb
, KERN_ERR
,
1414 "Not enough memory for "
1415 "storing quotafile name");
1418 if (sbi
->s_qf_names
[qtype
] &&
1419 strcmp(sbi
->s_qf_names
[qtype
], qname
)) {
1420 ext4_msg(sb
, KERN_ERR
,
1421 "%s quota file already "
1422 "specified", QTYPE2NAME(qtype
));
1426 sbi
->s_qf_names
[qtype
] = qname
;
1427 if (strchr(sbi
->s_qf_names
[qtype
], '/')) {
1428 ext4_msg(sb
, KERN_ERR
,
1429 "quotafile must be on "
1431 kfree(sbi
->s_qf_names
[qtype
]);
1432 sbi
->s_qf_names
[qtype
] = NULL
;
1435 set_opt(sbi
->s_mount_opt
, QUOTA
);
1437 case Opt_offusrjquota
:
1440 case Opt_offgrpjquota
:
1443 if (sb_any_quota_loaded(sb
) &&
1444 sbi
->s_qf_names
[qtype
]) {
1445 ext4_msg(sb
, KERN_ERR
, "Cannot change "
1446 "journaled quota options when "
1451 * The space will be released later when all options
1452 * are confirmed to be correct
1454 sbi
->s_qf_names
[qtype
] = NULL
;
1456 case Opt_jqfmt_vfsold
:
1457 qfmt
= QFMT_VFS_OLD
;
1459 case Opt_jqfmt_vfsv0
:
1462 case Opt_jqfmt_vfsv1
:
1465 if (sb_any_quota_loaded(sb
) &&
1466 sbi
->s_jquota_fmt
!= qfmt
) {
1467 ext4_msg(sb
, KERN_ERR
, "Cannot change "
1468 "journaled quota options when "
1472 sbi
->s_jquota_fmt
= qfmt
;
1476 set_opt(sbi
->s_mount_opt
, QUOTA
);
1477 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
1480 set_opt(sbi
->s_mount_opt
, QUOTA
);
1481 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1484 if (sb_any_quota_loaded(sb
)) {
1485 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1486 "options when quota turned on");
1489 clear_opt(sbi
->s_mount_opt
, QUOTA
);
1490 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1491 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1497 ext4_msg(sb
, KERN_ERR
,
1498 "quota options not supported");
1502 case Opt_offusrjquota
:
1503 case Opt_offgrpjquota
:
1504 case Opt_jqfmt_vfsold
:
1505 case Opt_jqfmt_vfsv0
:
1506 case Opt_jqfmt_vfsv1
:
1507 ext4_msg(sb
, KERN_ERR
,
1508 "journaled quota options not supported");
1514 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1517 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1520 if (match_int(&args
[0], &option
)) {
1521 set_opt(sbi
->s_mount_opt
, BARRIER
);
1525 set_opt(sbi
->s_mount_opt
, BARRIER
);
1527 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1533 ext4_msg(sb
, KERN_ERR
,
1534 "resize option only available "
1538 if (match_int(&args
[0], &option
) != 0)
1540 *n_blocks_count
= option
;
1543 set_opt(sbi
->s_mount_opt
, NOBH
);
1546 clear_opt(sbi
->s_mount_opt
, NOBH
);
1549 set_opt(sbi
->s_mount_opt
, I_VERSION
);
1550 sb
->s_flags
|= MS_I_VERSION
;
1552 case Opt_nodelalloc
:
1553 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
1556 if (match_int(&args
[0], &option
))
1560 sbi
->s_stripe
= option
;
1563 set_opt(sbi
->s_mount_opt
, DELALLOC
);
1565 case Opt_block_validity
:
1566 set_opt(sbi
->s_mount_opt
, BLOCK_VALIDITY
);
1568 case Opt_noblock_validity
:
1569 clear_opt(sbi
->s_mount_opt
, BLOCK_VALIDITY
);
1571 case Opt_inode_readahead_blks
:
1572 if (match_int(&args
[0], &option
))
1574 if (option
< 0 || option
> (1 << 30))
1576 if (!is_power_of_2(option
)) {
1577 ext4_msg(sb
, KERN_ERR
,
1578 "EXT4-fs: inode_readahead_blks"
1579 " must be a power of 2");
1582 sbi
->s_inode_readahead_blks
= option
;
1584 case Opt_journal_ioprio
:
1585 if (match_int(&args
[0], &option
))
1587 if (option
< 0 || option
> 7)
1589 *journal_ioprio
= IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
,
1592 case Opt_noauto_da_alloc
:
1593 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1595 case Opt_auto_da_alloc
:
1596 if (match_int(&args
[0], &option
)) {
1597 clear_opt(sbi
->s_mount_opt
, NO_AUTO_DA_ALLOC
);
1601 clear_opt(sbi
->s_mount_opt
, NO_AUTO_DA_ALLOC
);
1603 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1606 set_opt(sbi
->s_mount_opt
, DISCARD
);
1609 clear_opt(sbi
->s_mount_opt
, DISCARD
);
1612 ext4_msg(sb
, KERN_ERR
,
1613 "Unrecognized mount option \"%s\" "
1614 "or missing value", p
);
1619 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1620 if ((sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
) &&
1621 sbi
->s_qf_names
[USRQUOTA
])
1622 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1624 if ((sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
) &&
1625 sbi
->s_qf_names
[GRPQUOTA
])
1626 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1628 if ((sbi
->s_qf_names
[USRQUOTA
] &&
1629 (sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
)) ||
1630 (sbi
->s_qf_names
[GRPQUOTA
] &&
1631 (sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
))) {
1632 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1637 if (!sbi
->s_jquota_fmt
) {
1638 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1643 if (sbi
->s_jquota_fmt
) {
1644 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1645 "specified with no journaling "
1654 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1657 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1660 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1661 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
1662 "forcing read-only mode");
1667 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1668 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
1669 "running e2fsck is recommended");
1670 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1671 ext4_msg(sb
, KERN_WARNING
,
1672 "warning: mounting fs with errors, "
1673 "running e2fsck is recommended");
1674 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
1675 le16_to_cpu(es
->s_mnt_count
) >=
1676 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1677 ext4_msg(sb
, KERN_WARNING
,
1678 "warning: maximal mount count reached, "
1679 "running e2fsck is recommended");
1680 else if (le32_to_cpu(es
->s_checkinterval
) &&
1681 (le32_to_cpu(es
->s_lastcheck
) +
1682 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1683 ext4_msg(sb
, KERN_WARNING
,
1684 "warning: checktime reached, "
1685 "running e2fsck is recommended");
1686 if (!sbi
->s_journal
)
1687 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1688 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1689 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1690 le16_add_cpu(&es
->s_mnt_count
, 1);
1691 es
->s_mtime
= cpu_to_le32(get_seconds());
1692 ext4_update_dynamic_rev(sb
);
1694 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1696 ext4_commit_super(sb
, 1);
1697 if (test_opt(sb
, DEBUG
))
1698 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
1699 "bpg=%lu, ipg=%lu, mo=%04x]\n",
1701 sbi
->s_groups_count
,
1702 EXT4_BLOCKS_PER_GROUP(sb
),
1703 EXT4_INODES_PER_GROUP(sb
),
1709 static int ext4_fill_flex_info(struct super_block
*sb
)
1711 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1712 struct ext4_group_desc
*gdp
= NULL
;
1713 ext4_group_t flex_group_count
;
1714 ext4_group_t flex_group
;
1715 int groups_per_flex
= 0;
1719 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1720 groups_per_flex
= 1 << sbi
->s_log_groups_per_flex
;
1722 if (groups_per_flex
< 2) {
1723 sbi
->s_log_groups_per_flex
= 0;
1727 /* We allocate both existing and potentially added groups */
1728 flex_group_count
= ((sbi
->s_groups_count
+ groups_per_flex
- 1) +
1729 ((le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
) + 1) <<
1730 EXT4_DESC_PER_BLOCK_BITS(sb
))) / groups_per_flex
;
1731 size
= flex_group_count
* sizeof(struct flex_groups
);
1732 sbi
->s_flex_groups
= kzalloc(size
, GFP_KERNEL
);
1733 if (sbi
->s_flex_groups
== NULL
) {
1734 sbi
->s_flex_groups
= vmalloc(size
);
1735 if (sbi
->s_flex_groups
)
1736 memset(sbi
->s_flex_groups
, 0, size
);
1738 if (sbi
->s_flex_groups
== NULL
) {
1739 ext4_msg(sb
, KERN_ERR
, "not enough memory for "
1740 "%u flex groups", flex_group_count
);
1744 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1745 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1747 flex_group
= ext4_flex_group(sbi
, i
);
1748 atomic_add(ext4_free_inodes_count(sb
, gdp
),
1749 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
1750 atomic_add(ext4_free_blks_count(sb
, gdp
),
1751 &sbi
->s_flex_groups
[flex_group
].free_blocks
);
1752 atomic_add(ext4_used_dirs_count(sb
, gdp
),
1753 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
1761 __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
1762 struct ext4_group_desc
*gdp
)
1766 if (sbi
->s_es
->s_feature_ro_compat
&
1767 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) {
1768 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
1769 __le32 le_group
= cpu_to_le32(block_group
);
1771 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
1772 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
1773 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
1774 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
1775 /* for checksum of struct ext4_group_desc do the rest...*/
1776 if ((sbi
->s_es
->s_feature_incompat
&
1777 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
1778 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
1779 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
1780 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
1784 return cpu_to_le16(crc
);
1787 int ext4_group_desc_csum_verify(struct ext4_sb_info
*sbi
, __u32 block_group
,
1788 struct ext4_group_desc
*gdp
)
1790 if ((sbi
->s_es
->s_feature_ro_compat
&
1791 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) &&
1792 (gdp
->bg_checksum
!= ext4_group_desc_csum(sbi
, block_group
, gdp
)))
1798 /* Called at mount-time, super-block is locked */
1799 static int ext4_check_descriptors(struct super_block
*sb
)
1801 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1802 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
1803 ext4_fsblk_t last_block
;
1804 ext4_fsblk_t block_bitmap
;
1805 ext4_fsblk_t inode_bitmap
;
1806 ext4_fsblk_t inode_table
;
1807 int flexbg_flag
= 0;
1810 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
1813 ext4_debug("Checking group descriptors");
1815 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1816 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1818 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
1819 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
1821 last_block
= first_block
+
1822 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
1824 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
1825 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
1826 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1827 "Block bitmap for group %u not in group "
1828 "(block %llu)!", i
, block_bitmap
);
1831 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
1832 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
1833 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1834 "Inode bitmap for group %u not in group "
1835 "(block %llu)!", i
, inode_bitmap
);
1838 inode_table
= ext4_inode_table(sb
, gdp
);
1839 if (inode_table
< first_block
||
1840 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
1841 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1842 "Inode table for group %u not in group "
1843 "(block %llu)!", i
, inode_table
);
1846 ext4_lock_group(sb
, i
);
1847 if (!ext4_group_desc_csum_verify(sbi
, i
, gdp
)) {
1848 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1849 "Checksum for group %u failed (%u!=%u)",
1850 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
1851 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
1852 if (!(sb
->s_flags
& MS_RDONLY
)) {
1853 ext4_unlock_group(sb
, i
);
1857 ext4_unlock_group(sb
, i
);
1859 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
1862 ext4_free_blocks_count_set(sbi
->s_es
, ext4_count_free_blocks(sb
));
1863 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
1867 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1868 * the superblock) which were deleted from all directories, but held open by
1869 * a process at the time of a crash. We walk the list and try to delete these
1870 * inodes at recovery time (only with a read-write filesystem).
1872 * In order to keep the orphan inode chain consistent during traversal (in
1873 * case of crash during recovery), we link each inode into the superblock
1874 * orphan list_head and handle it the same way as an inode deletion during
1875 * normal operation (which journals the operations for us).
1877 * We only do an iget() and an iput() on each inode, which is very safe if we
1878 * accidentally point at an in-use or already deleted inode. The worst that
1879 * can happen in this case is that we get a "bit already cleared" message from
1880 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1881 * e2fsck was run on this filesystem, and it must have already done the orphan
1882 * inode cleanup for us, so we can safely abort without any further action.
1884 static void ext4_orphan_cleanup(struct super_block
*sb
,
1885 struct ext4_super_block
*es
)
1887 unsigned int s_flags
= sb
->s_flags
;
1888 int nr_orphans
= 0, nr_truncates
= 0;
1892 if (!es
->s_last_orphan
) {
1893 jbd_debug(4, "no orphan inodes to clean up\n");
1897 if (bdev_read_only(sb
->s_bdev
)) {
1898 ext4_msg(sb
, KERN_ERR
, "write access "
1899 "unavailable, skipping orphan cleanup");
1903 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
1904 if (es
->s_last_orphan
)
1905 jbd_debug(1, "Errors on filesystem, "
1906 "clearing orphan list.\n");
1907 es
->s_last_orphan
= 0;
1908 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1912 if (s_flags
& MS_RDONLY
) {
1913 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
1914 sb
->s_flags
&= ~MS_RDONLY
;
1917 /* Needed for iput() to work correctly and not trash data */
1918 sb
->s_flags
|= MS_ACTIVE
;
1919 /* Turn on quotas so that they are updated correctly */
1920 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1921 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
1922 int ret
= ext4_quota_on_mount(sb
, i
);
1924 ext4_msg(sb
, KERN_ERR
,
1925 "Cannot turn on journaled "
1926 "quota: error %d", ret
);
1931 while (es
->s_last_orphan
) {
1932 struct inode
*inode
;
1934 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
1935 if (IS_ERR(inode
)) {
1936 es
->s_last_orphan
= 0;
1940 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
1942 if (inode
->i_nlink
) {
1943 ext4_msg(sb
, KERN_DEBUG
,
1944 "%s: truncating inode %lu to %lld bytes",
1945 __func__
, inode
->i_ino
, inode
->i_size
);
1946 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
1947 inode
->i_ino
, inode
->i_size
);
1948 ext4_truncate(inode
);
1951 ext4_msg(sb
, KERN_DEBUG
,
1952 "%s: deleting unreferenced inode %lu",
1953 __func__
, inode
->i_ino
);
1954 jbd_debug(2, "deleting unreferenced inode %lu\n",
1958 iput(inode
); /* The delete magic happens here! */
1961 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
1964 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
1965 PLURAL(nr_orphans
));
1967 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
1968 PLURAL(nr_truncates
));
1970 /* Turn quotas off */
1971 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1972 if (sb_dqopt(sb
)->files
[i
])
1973 vfs_quota_off(sb
, i
, 0);
1976 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
1980 * Maximal extent format file size.
1981 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1982 * extent format containers, within a sector_t, and within i_blocks
1983 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1984 * so that won't be a limiting factor.
1986 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1988 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
1991 loff_t upper_limit
= MAX_LFS_FILESIZE
;
1993 /* small i_blocks in vfs inode? */
1994 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
1996 * CONFIG_LBDAF is not enabled implies the inode
1997 * i_block represent total blocks in 512 bytes
1998 * 32 == size of vfs inode i_blocks * 8
2000 upper_limit
= (1LL << 32) - 1;
2002 /* total blocks in file system block size */
2003 upper_limit
>>= (blkbits
- 9);
2004 upper_limit
<<= blkbits
;
2007 /* 32-bit extent-start container, ee_block */
2012 /* Sanity check against vm- & vfs- imposed limits */
2013 if (res
> upper_limit
)
2020 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2021 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2022 * We need to be 1 filesystem block less than the 2^48 sector limit.
2024 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2026 loff_t res
= EXT4_NDIR_BLOCKS
;
2029 /* This is calculated to be the largest file size for a dense, block
2030 * mapped file such that the file's total number of 512-byte sectors,
2031 * including data and all indirect blocks, does not exceed (2^48 - 1).
2033 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2034 * number of 512-byte sectors of the file.
2037 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2039 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2040 * the inode i_block field represents total file blocks in
2041 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2043 upper_limit
= (1LL << 32) - 1;
2045 /* total blocks in file system block size */
2046 upper_limit
>>= (bits
- 9);
2050 * We use 48 bit ext4_inode i_blocks
2051 * With EXT4_HUGE_FILE_FL set the i_blocks
2052 * represent total number of blocks in
2053 * file system block size
2055 upper_limit
= (1LL << 48) - 1;
2059 /* indirect blocks */
2061 /* double indirect blocks */
2062 meta_blocks
+= 1 + (1LL << (bits
-2));
2063 /* tripple indirect blocks */
2064 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2066 upper_limit
-= meta_blocks
;
2067 upper_limit
<<= bits
;
2069 res
+= 1LL << (bits
-2);
2070 res
+= 1LL << (2*(bits
-2));
2071 res
+= 1LL << (3*(bits
-2));
2073 if (res
> upper_limit
)
2076 if (res
> MAX_LFS_FILESIZE
)
2077 res
= MAX_LFS_FILESIZE
;
2082 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2083 ext4_fsblk_t logical_sb_block
, int nr
)
2085 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2086 ext4_group_t bg
, first_meta_bg
;
2089 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2091 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
2093 return logical_sb_block
+ nr
+ 1;
2094 bg
= sbi
->s_desc_per_block
* nr
;
2095 if (ext4_bg_has_super(sb
, bg
))
2098 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2102 * ext4_get_stripe_size: Get the stripe size.
2103 * @sbi: In memory super block info
2105 * If we have specified it via mount option, then
2106 * use the mount option value. If the value specified at mount time is
2107 * greater than the blocks per group use the super block value.
2108 * If the super block value is greater than blocks per group return 0.
2109 * Allocator needs it be less than blocks per group.
2112 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2114 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2115 unsigned long stripe_width
=
2116 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2118 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2119 return sbi
->s_stripe
;
2121 if (stripe_width
<= sbi
->s_blocks_per_group
)
2122 return stripe_width
;
2124 if (stride
<= sbi
->s_blocks_per_group
)
2133 struct attribute attr
;
2134 ssize_t (*show
)(struct ext4_attr
*, struct ext4_sb_info
*, char *);
2135 ssize_t (*store
)(struct ext4_attr
*, struct ext4_sb_info
*,
2136 const char *, size_t);
2140 static int parse_strtoul(const char *buf
,
2141 unsigned long max
, unsigned long *value
)
2145 *value
= simple_strtoul(skip_spaces(buf
), &endp
, 0);
2146 endp
= skip_spaces(endp
);
2147 if (*endp
|| *value
> max
)
2153 static ssize_t
delayed_allocation_blocks_show(struct ext4_attr
*a
,
2154 struct ext4_sb_info
*sbi
,
2157 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2158 (s64
) percpu_counter_sum(&sbi
->s_dirtyblocks_counter
));
2161 static ssize_t
session_write_kbytes_show(struct ext4_attr
*a
,
2162 struct ext4_sb_info
*sbi
, char *buf
)
2164 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2166 return snprintf(buf
, PAGE_SIZE
, "%lu\n",
2167 (part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2168 sbi
->s_sectors_written_start
) >> 1);
2171 static ssize_t
lifetime_write_kbytes_show(struct ext4_attr
*a
,
2172 struct ext4_sb_info
*sbi
, char *buf
)
2174 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2176 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2177 sbi
->s_kbytes_written
+
2178 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2179 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
2182 static ssize_t
inode_readahead_blks_store(struct ext4_attr
*a
,
2183 struct ext4_sb_info
*sbi
,
2184 const char *buf
, size_t count
)
2188 if (parse_strtoul(buf
, 0x40000000, &t
))
2191 if (!is_power_of_2(t
))
2194 sbi
->s_inode_readahead_blks
= t
;
2198 static ssize_t
sbi_ui_show(struct ext4_attr
*a
,
2199 struct ext4_sb_info
*sbi
, char *buf
)
2201 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2203 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
2206 static ssize_t
sbi_ui_store(struct ext4_attr
*a
,
2207 struct ext4_sb_info
*sbi
,
2208 const char *buf
, size_t count
)
2210 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2213 if (parse_strtoul(buf
, 0xffffffff, &t
))
2219 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2220 static struct ext4_attr ext4_attr_##_name = { \
2221 .attr = {.name = __stringify(_name), .mode = _mode }, \
2224 .offset = offsetof(struct ext4_sb_info, _elname), \
2226 #define EXT4_ATTR(name, mode, show, store) \
2227 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2229 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2230 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2231 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2232 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2233 #define ATTR_LIST(name) &ext4_attr_##name.attr
2235 EXT4_RO_ATTR(delayed_allocation_blocks
);
2236 EXT4_RO_ATTR(session_write_kbytes
);
2237 EXT4_RO_ATTR(lifetime_write_kbytes
);
2238 EXT4_ATTR_OFFSET(inode_readahead_blks
, 0644, sbi_ui_show
,
2239 inode_readahead_blks_store
, s_inode_readahead_blks
);
2240 EXT4_RW_ATTR_SBI_UI(inode_goal
, s_inode_goal
);
2241 EXT4_RW_ATTR_SBI_UI(mb_stats
, s_mb_stats
);
2242 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan
, s_mb_max_to_scan
);
2243 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan
, s_mb_min_to_scan
);
2244 EXT4_RW_ATTR_SBI_UI(mb_order2_req
, s_mb_order2_reqs
);
2245 EXT4_RW_ATTR_SBI_UI(mb_stream_req
, s_mb_stream_request
);
2246 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc
, s_mb_group_prealloc
);
2247 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump
, s_max_writeback_mb_bump
);
2249 static struct attribute
*ext4_attrs
[] = {
2250 ATTR_LIST(delayed_allocation_blocks
),
2251 ATTR_LIST(session_write_kbytes
),
2252 ATTR_LIST(lifetime_write_kbytes
),
2253 ATTR_LIST(inode_readahead_blks
),
2254 ATTR_LIST(inode_goal
),
2255 ATTR_LIST(mb_stats
),
2256 ATTR_LIST(mb_max_to_scan
),
2257 ATTR_LIST(mb_min_to_scan
),
2258 ATTR_LIST(mb_order2_req
),
2259 ATTR_LIST(mb_stream_req
),
2260 ATTR_LIST(mb_group_prealloc
),
2261 ATTR_LIST(max_writeback_mb_bump
),
2265 static ssize_t
ext4_attr_show(struct kobject
*kobj
,
2266 struct attribute
*attr
, char *buf
)
2268 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2270 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2272 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
2275 static ssize_t
ext4_attr_store(struct kobject
*kobj
,
2276 struct attribute
*attr
,
2277 const char *buf
, size_t len
)
2279 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2281 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2283 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
2286 static void ext4_sb_release(struct kobject
*kobj
)
2288 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2290 complete(&sbi
->s_kobj_unregister
);
2294 static struct sysfs_ops ext4_attr_ops
= {
2295 .show
= ext4_attr_show
,
2296 .store
= ext4_attr_store
,
2299 static struct kobj_type ext4_ktype
= {
2300 .default_attrs
= ext4_attrs
,
2301 .sysfs_ops
= &ext4_attr_ops
,
2302 .release
= ext4_sb_release
,
2306 * Check whether this filesystem can be mounted based on
2307 * the features present and the RDONLY/RDWR mount requested.
2308 * Returns 1 if this filesystem can be mounted as requested,
2309 * 0 if it cannot be.
2311 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2313 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
)) {
2314 ext4_msg(sb
, KERN_ERR
,
2315 "Couldn't mount because of "
2316 "unsupported optional features (%x)",
2317 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2318 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2325 /* Check that feature set is OK for a read-write mount */
2326 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
)) {
2327 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2328 "unsupported optional features (%x)",
2329 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2330 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2334 * Large file size enabled file system can only be mounted
2335 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2337 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
2338 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2339 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2340 "cannot be mounted RDWR without "
2348 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
2349 __releases(kernel_lock
)
2350 __acquires(kernel_lock
)
2352 struct buffer_head
*bh
;
2353 struct ext4_super_block
*es
= NULL
;
2354 struct ext4_sb_info
*sbi
;
2356 ext4_fsblk_t sb_block
= get_sb_block(&data
);
2357 ext4_fsblk_t logical_sb_block
;
2358 unsigned long offset
= 0;
2359 unsigned long journal_devnum
= 0;
2360 unsigned long def_mount_opts
;
2366 unsigned int db_count
;
2368 int needs_recovery
, has_huge_files
;
2371 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
2373 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
2377 sbi
->s_blockgroup_lock
=
2378 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
2379 if (!sbi
->s_blockgroup_lock
) {
2383 sb
->s_fs_info
= sbi
;
2384 sbi
->s_mount_opt
= 0;
2385 sbi
->s_resuid
= EXT4_DEF_RESUID
;
2386 sbi
->s_resgid
= EXT4_DEF_RESGID
;
2387 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
2388 sbi
->s_sb_block
= sb_block
;
2389 sbi
->s_sectors_written_start
= part_stat_read(sb
->s_bdev
->bd_part
,
2394 /* Cleanup superblock name */
2395 for (cp
= sb
->s_id
; (cp
= strchr(cp
, '/'));)
2398 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
2400 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
2405 * The ext4 superblock will not be buffer aligned for other than 1kB
2406 * block sizes. We need to calculate the offset from buffer start.
2408 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
2409 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2410 offset
= do_div(logical_sb_block
, blocksize
);
2412 logical_sb_block
= sb_block
;
2415 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
2416 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
2420 * Note: s_es must be initialized as soon as possible because
2421 * some ext4 macro-instructions depend on its value
2423 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
2425 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
2426 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
2428 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
2430 /* Set defaults before we parse the mount options */
2431 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
2432 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
2433 set_opt(sbi
->s_mount_opt
, DEBUG
);
2434 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
2435 set_opt(sbi
->s_mount_opt
, GRPID
);
2436 if (def_mount_opts
& EXT4_DEFM_UID16
)
2437 set_opt(sbi
->s_mount_opt
, NO_UID32
);
2438 #ifdef CONFIG_EXT4_FS_XATTR
2439 if (def_mount_opts
& EXT4_DEFM_XATTR_USER
)
2440 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
2442 #ifdef CONFIG_EXT4_FS_POSIX_ACL
2443 if (def_mount_opts
& EXT4_DEFM_ACL
)
2444 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
2446 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
2447 sbi
->s_mount_opt
|= EXT4_MOUNT_JOURNAL_DATA
;
2448 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
2449 sbi
->s_mount_opt
|= EXT4_MOUNT_ORDERED_DATA
;
2450 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
2451 sbi
->s_mount_opt
|= EXT4_MOUNT_WRITEBACK_DATA
;
2453 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
2454 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
2455 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
2456 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
2458 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
2460 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
2461 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
2462 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
2463 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
2464 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
2466 set_opt(sbi
->s_mount_opt
, BARRIER
);
2469 * enable delayed allocation by default
2470 * Use -o nodelalloc to turn it off
2472 set_opt(sbi
->s_mount_opt
, DELALLOC
);
2474 if (!parse_options((char *) data
, sb
, &journal_devnum
,
2475 &journal_ioprio
, NULL
, 0))
2478 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
2479 ((sbi
->s_mount_opt
& EXT4_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
2481 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
2482 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
2483 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
2484 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
2485 ext4_msg(sb
, KERN_WARNING
,
2486 "feature flags set on rev 0 fs, "
2487 "running e2fsck is recommended");
2490 * Check feature flags regardless of the revision level, since we
2491 * previously didn't change the revision level when setting the flags,
2492 * so there is a chance incompat flags are set on a rev 0 filesystem.
2494 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
2497 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
2499 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
2500 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
2501 ext4_msg(sb
, KERN_ERR
,
2502 "Unsupported filesystem blocksize %d", blocksize
);
2506 if (sb
->s_blocksize
!= blocksize
) {
2507 /* Validate the filesystem blocksize */
2508 if (!sb_set_blocksize(sb
, blocksize
)) {
2509 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
2515 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2516 offset
= do_div(logical_sb_block
, blocksize
);
2517 bh
= sb_bread(sb
, logical_sb_block
);
2519 ext4_msg(sb
, KERN_ERR
,
2520 "Can't read superblock on 2nd try");
2523 es
= (struct ext4_super_block
*)(((char *)bh
->b_data
) + offset
);
2525 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
2526 ext4_msg(sb
, KERN_ERR
,
2527 "Magic mismatch, very weird!");
2532 has_huge_files
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2533 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
);
2534 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
2536 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
2538 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
2539 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
2540 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
2542 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
2543 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
2544 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
2545 (!is_power_of_2(sbi
->s_inode_size
)) ||
2546 (sbi
->s_inode_size
> blocksize
)) {
2547 ext4_msg(sb
, KERN_ERR
,
2548 "unsupported inode size: %d",
2552 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
2553 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
2556 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
2557 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
2558 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
2559 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
2560 !is_power_of_2(sbi
->s_desc_size
)) {
2561 ext4_msg(sb
, KERN_ERR
,
2562 "unsupported descriptor size %lu",
2567 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
2569 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
2570 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
2571 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
2574 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
2575 if (sbi
->s_inodes_per_block
== 0)
2577 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
2578 sbi
->s_inodes_per_block
;
2579 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
2581 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
2582 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
2583 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
2585 for (i
= 0; i
< 4; i
++)
2586 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
2587 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
2588 i
= le32_to_cpu(es
->s_flags
);
2589 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
2590 sbi
->s_hash_unsigned
= 3;
2591 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
2592 #ifdef __CHAR_UNSIGNED__
2593 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
2594 sbi
->s_hash_unsigned
= 3;
2596 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
2601 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
2602 ext4_msg(sb
, KERN_ERR
,
2603 "#blocks per group too big: %lu",
2604 sbi
->s_blocks_per_group
);
2607 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
2608 ext4_msg(sb
, KERN_ERR
,
2609 "#inodes per group too big: %lu",
2610 sbi
->s_inodes_per_group
);
2615 * Test whether we have more sectors than will fit in sector_t,
2616 * and whether the max offset is addressable by the page cache.
2618 if ((ext4_blocks_count(es
) >
2619 (sector_t
)(~0ULL) >> (sb
->s_blocksize_bits
- 9)) ||
2620 (ext4_blocks_count(es
) >
2621 (pgoff_t
)(~0ULL) >> (PAGE_CACHE_SHIFT
- sb
->s_blocksize_bits
))) {
2622 ext4_msg(sb
, KERN_ERR
, "filesystem"
2623 " too large to mount safely on this system");
2624 if (sizeof(sector_t
) < 8)
2625 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
2630 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
2633 /* check blocks count against device size */
2634 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
2635 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
2636 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
2637 "exceeds size of device (%llu blocks)",
2638 ext4_blocks_count(es
), blocks_count
);
2643 * It makes no sense for the first data block to be beyond the end
2644 * of the filesystem.
2646 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
2647 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data"
2648 "block %u is beyond end of filesystem (%llu)",
2649 le32_to_cpu(es
->s_first_data_block
),
2650 ext4_blocks_count(es
));
2653 blocks_count
= (ext4_blocks_count(es
) -
2654 le32_to_cpu(es
->s_first_data_block
) +
2655 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2656 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
2657 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
2658 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
2659 "(block count %llu, first data block %u, "
2660 "blocks per group %lu)", sbi
->s_groups_count
,
2661 ext4_blocks_count(es
),
2662 le32_to_cpu(es
->s_first_data_block
),
2663 EXT4_BLOCKS_PER_GROUP(sb
));
2666 sbi
->s_groups_count
= blocks_count
;
2667 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
2668 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
2669 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
2670 EXT4_DESC_PER_BLOCK(sb
);
2671 sbi
->s_group_desc
= kmalloc(db_count
* sizeof(struct buffer_head
*),
2673 if (sbi
->s_group_desc
== NULL
) {
2674 ext4_msg(sb
, KERN_ERR
, "not enough memory");
2678 #ifdef CONFIG_PROC_FS
2680 sbi
->s_proc
= proc_mkdir(sb
->s_id
, ext4_proc_root
);
2683 bgl_lock_init(sbi
->s_blockgroup_lock
);
2685 for (i
= 0; i
< db_count
; i
++) {
2686 block
= descriptor_loc(sb
, logical_sb_block
, i
);
2687 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
2688 if (!sbi
->s_group_desc
[i
]) {
2689 ext4_msg(sb
, KERN_ERR
,
2690 "can't read group descriptor %d", i
);
2695 if (!ext4_check_descriptors(sb
)) {
2696 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
2699 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
2700 if (!ext4_fill_flex_info(sb
)) {
2701 ext4_msg(sb
, KERN_ERR
,
2702 "unable to initialize "
2703 "flex_bg meta info!");
2707 sbi
->s_gdb_count
= db_count
;
2708 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
2709 spin_lock_init(&sbi
->s_next_gen_lock
);
2711 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
2712 ext4_count_free_blocks(sb
));
2714 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
2715 ext4_count_free_inodes(sb
));
2718 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
2719 ext4_count_dirs(sb
));
2722 err
= percpu_counter_init(&sbi
->s_dirtyblocks_counter
, 0);
2725 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
2729 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
2730 sbi
->s_max_writeback_mb_bump
= 128;
2733 * set up enough so that it can read an inode
2735 if (!test_opt(sb
, NOLOAD
) &&
2736 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
2737 sb
->s_op
= &ext4_sops
;
2739 sb
->s_op
= &ext4_nojournal_sops
;
2740 sb
->s_export_op
= &ext4_export_ops
;
2741 sb
->s_xattr
= ext4_xattr_handlers
;
2743 sb
->s_qcop
= &ext4_qctl_operations
;
2744 sb
->dq_op
= &ext4_quota_operations
;
2746 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
2747 mutex_init(&sbi
->s_orphan_lock
);
2748 mutex_init(&sbi
->s_resize_lock
);
2752 needs_recovery
= (es
->s_last_orphan
!= 0 ||
2753 EXT4_HAS_INCOMPAT_FEATURE(sb
,
2754 EXT4_FEATURE_INCOMPAT_RECOVER
));
2757 * The first inode we look at is the journal inode. Don't try
2758 * root first: it may be modified in the journal!
2760 if (!test_opt(sb
, NOLOAD
) &&
2761 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
2762 if (ext4_load_journal(sb
, es
, journal_devnum
))
2764 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
2765 EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
2766 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
2767 "suppressed and not mounted read-only");
2770 clear_opt(sbi
->s_mount_opt
, DATA_FLAGS
);
2771 set_opt(sbi
->s_mount_opt
, WRITEBACK_DATA
);
2772 sbi
->s_journal
= NULL
;
2777 if (ext4_blocks_count(es
) > 0xffffffffULL
&&
2778 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
2779 JBD2_FEATURE_INCOMPAT_64BIT
)) {
2780 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
2784 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
2785 jbd2_journal_set_features(sbi
->s_journal
,
2786 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2787 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2788 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
2789 jbd2_journal_set_features(sbi
->s_journal
,
2790 JBD2_FEATURE_COMPAT_CHECKSUM
, 0, 0);
2791 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
2792 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2794 jbd2_journal_clear_features(sbi
->s_journal
,
2795 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2796 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2799 /* We have now updated the journal if required, so we can
2800 * validate the data journaling mode. */
2801 switch (test_opt(sb
, DATA_FLAGS
)) {
2803 /* No mode set, assume a default based on the journal
2804 * capabilities: ORDERED_DATA if the journal can
2805 * cope, else JOURNAL_DATA
2807 if (jbd2_journal_check_available_features
2808 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
2809 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
2811 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
2814 case EXT4_MOUNT_ORDERED_DATA
:
2815 case EXT4_MOUNT_WRITEBACK_DATA
:
2816 if (!jbd2_journal_check_available_features
2817 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
2818 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
2819 "requested data journaling mode");
2825 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
2829 if (test_opt(sb
, NOBH
)) {
2830 if (!(test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)) {
2831 ext4_msg(sb
, KERN_WARNING
, "Ignoring nobh option - "
2832 "its supported only with writeback mode");
2833 clear_opt(sbi
->s_mount_opt
, NOBH
);
2836 EXT4_SB(sb
)->dio_unwritten_wq
= create_workqueue("ext4-dio-unwritten");
2837 if (!EXT4_SB(sb
)->dio_unwritten_wq
) {
2838 printk(KERN_ERR
"EXT4-fs: failed to create DIO workqueue\n");
2839 goto failed_mount_wq
;
2843 * The jbd2_journal_load will have done any necessary log recovery,
2844 * so we can safely mount the rest of the filesystem now.
2847 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
2849 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
2850 ret
= PTR_ERR(root
);
2853 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
2855 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
2858 sb
->s_root
= d_alloc_root(root
);
2860 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
2866 ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
);
2868 /* determine the minimum size of new large inodes, if present */
2869 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
2870 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2871 EXT4_GOOD_OLD_INODE_SIZE
;
2872 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2873 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
2874 if (sbi
->s_want_extra_isize
<
2875 le16_to_cpu(es
->s_want_extra_isize
))
2876 sbi
->s_want_extra_isize
=
2877 le16_to_cpu(es
->s_want_extra_isize
);
2878 if (sbi
->s_want_extra_isize
<
2879 le16_to_cpu(es
->s_min_extra_isize
))
2880 sbi
->s_want_extra_isize
=
2881 le16_to_cpu(es
->s_min_extra_isize
);
2884 /* Check if enough inode space is available */
2885 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
2886 sbi
->s_inode_size
) {
2887 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2888 EXT4_GOOD_OLD_INODE_SIZE
;
2889 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
2893 if (test_opt(sb
, DELALLOC
) &&
2894 (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)) {
2895 ext4_msg(sb
, KERN_WARNING
, "Ignoring delalloc option - "
2896 "requested data journaling mode");
2897 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
2900 err
= ext4_setup_system_zone(sb
);
2902 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
2903 "zone (%d)\n", err
);
2908 err
= ext4_mb_init(sb
, needs_recovery
);
2910 ext4_msg(sb
, KERN_ERR
, "failed to initalize mballoc (%d)",
2915 sbi
->s_kobj
.kset
= ext4_kset
;
2916 init_completion(&sbi
->s_kobj_unregister
);
2917 err
= kobject_init_and_add(&sbi
->s_kobj
, &ext4_ktype
, NULL
,
2920 ext4_mb_release(sb
);
2921 ext4_ext_release(sb
);
2925 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
2926 ext4_orphan_cleanup(sb
, es
);
2927 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
2928 if (needs_recovery
) {
2929 ext4_msg(sb
, KERN_INFO
, "recovery complete");
2930 ext4_mark_recovery_complete(sb
, es
);
2932 if (EXT4_SB(sb
)->s_journal
) {
2933 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
2934 descr
= " journalled data mode";
2935 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
2936 descr
= " ordered data mode";
2938 descr
= " writeback data mode";
2940 descr
= "out journal";
2942 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s", descr
);
2949 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
2953 ext4_msg(sb
, KERN_ERR
, "mount failed");
2954 destroy_workqueue(EXT4_SB(sb
)->dio_unwritten_wq
);
2956 ext4_release_system_zone(sb
);
2957 if (sbi
->s_journal
) {
2958 jbd2_journal_destroy(sbi
->s_journal
);
2959 sbi
->s_journal
= NULL
;
2962 if (sbi
->s_flex_groups
) {
2963 if (is_vmalloc_addr(sbi
->s_flex_groups
))
2964 vfree(sbi
->s_flex_groups
);
2966 kfree(sbi
->s_flex_groups
);
2968 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
2969 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
2970 percpu_counter_destroy(&sbi
->s_dirs_counter
);
2971 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
2973 for (i
= 0; i
< db_count
; i
++)
2974 brelse(sbi
->s_group_desc
[i
]);
2975 kfree(sbi
->s_group_desc
);
2978 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
2981 for (i
= 0; i
< MAXQUOTAS
; i
++)
2982 kfree(sbi
->s_qf_names
[i
]);
2984 ext4_blkdev_remove(sbi
);
2987 sb
->s_fs_info
= NULL
;
2988 kfree(sbi
->s_blockgroup_lock
);
2995 * Setup any per-fs journal parameters now. We'll do this both on
2996 * initial mount, once the journal has been initialised but before we've
2997 * done any recovery; and again on any subsequent remount.
2999 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
3001 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3003 journal
->j_commit_interval
= sbi
->s_commit_interval
;
3004 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
3005 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
3007 spin_lock(&journal
->j_state_lock
);
3008 if (test_opt(sb
, BARRIER
))
3009 journal
->j_flags
|= JBD2_BARRIER
;
3011 journal
->j_flags
&= ~JBD2_BARRIER
;
3012 if (test_opt(sb
, DATA_ERR_ABORT
))
3013 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
3015 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
3016 spin_unlock(&journal
->j_state_lock
);
3019 static journal_t
*ext4_get_journal(struct super_block
*sb
,
3020 unsigned int journal_inum
)
3022 struct inode
*journal_inode
;
3025 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3027 /* First, test for the existence of a valid inode on disk. Bad
3028 * things happen if we iget() an unused inode, as the subsequent
3029 * iput() will try to delete it. */
3031 journal_inode
= ext4_iget(sb
, journal_inum
);
3032 if (IS_ERR(journal_inode
)) {
3033 ext4_msg(sb
, KERN_ERR
, "no journal found");
3036 if (!journal_inode
->i_nlink
) {
3037 make_bad_inode(journal_inode
);
3038 iput(journal_inode
);
3039 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
3043 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3044 journal_inode
, journal_inode
->i_size
);
3045 if (!S_ISREG(journal_inode
->i_mode
)) {
3046 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
3047 iput(journal_inode
);
3051 journal
= jbd2_journal_init_inode(journal_inode
);
3053 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
3054 iput(journal_inode
);
3057 journal
->j_private
= sb
;
3058 ext4_init_journal_params(sb
, journal
);
3062 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
3065 struct buffer_head
*bh
;
3069 int hblock
, blocksize
;
3070 ext4_fsblk_t sb_block
;
3071 unsigned long offset
;
3072 struct ext4_super_block
*es
;
3073 struct block_device
*bdev
;
3075 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3077 bdev
= ext4_blkdev_get(j_dev
, sb
);
3081 if (bd_claim(bdev
, sb
)) {
3082 ext4_msg(sb
, KERN_ERR
,
3083 "failed to claim external journal device");
3084 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
3088 blocksize
= sb
->s_blocksize
;
3089 hblock
= bdev_logical_block_size(bdev
);
3090 if (blocksize
< hblock
) {
3091 ext4_msg(sb
, KERN_ERR
,
3092 "blocksize too small for journal device");
3096 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
3097 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
3098 set_blocksize(bdev
, blocksize
);
3099 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
3100 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
3101 "external journal");
3105 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
3106 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
3107 !(le32_to_cpu(es
->s_feature_incompat
) &
3108 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
3109 ext4_msg(sb
, KERN_ERR
, "external journal has "
3115 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
3116 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
3121 len
= ext4_blocks_count(es
);
3122 start
= sb_block
+ 1;
3123 brelse(bh
); /* we're done with the superblock */
3125 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
3126 start
, len
, blocksize
);
3128 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
3131 journal
->j_private
= sb
;
3132 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
3133 wait_on_buffer(journal
->j_sb_buffer
);
3134 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
3135 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
3138 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
3139 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
3140 "user (unsupported) - %d",
3141 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
3144 EXT4_SB(sb
)->journal_bdev
= bdev
;
3145 ext4_init_journal_params(sb
, journal
);
3149 jbd2_journal_destroy(journal
);
3151 ext4_blkdev_put(bdev
);
3155 static int ext4_load_journal(struct super_block
*sb
,
3156 struct ext4_super_block
*es
,
3157 unsigned long journal_devnum
)
3160 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
3163 int really_read_only
;
3165 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3167 if (journal_devnum
&&
3168 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3169 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
3170 "numbers have changed");
3171 journal_dev
= new_decode_dev(journal_devnum
);
3173 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
3175 really_read_only
= bdev_read_only(sb
->s_bdev
);
3178 * Are we loading a blank journal or performing recovery after a
3179 * crash? For recovery, we need to check in advance whether we
3180 * can get read-write access to the device.
3182 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3183 if (sb
->s_flags
& MS_RDONLY
) {
3184 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
3185 "required on readonly filesystem");
3186 if (really_read_only
) {
3187 ext4_msg(sb
, KERN_ERR
, "write access "
3188 "unavailable, cannot proceed");
3191 ext4_msg(sb
, KERN_INFO
, "write access will "
3192 "be enabled during recovery");
3196 if (journal_inum
&& journal_dev
) {
3197 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
3198 "and inode journals!");
3203 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
3206 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
3210 if (!(journal
->j_flags
& JBD2_BARRIER
))
3211 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
3213 if (!really_read_only
&& test_opt(sb
, UPDATE_JOURNAL
)) {
3214 err
= jbd2_journal_update_format(journal
);
3216 ext4_msg(sb
, KERN_ERR
, "error updating journal");
3217 jbd2_journal_destroy(journal
);
3222 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
3223 err
= jbd2_journal_wipe(journal
, !really_read_only
);
3225 err
= jbd2_journal_load(journal
);
3228 ext4_msg(sb
, KERN_ERR
, "error loading journal");
3229 jbd2_journal_destroy(journal
);
3233 EXT4_SB(sb
)->s_journal
= journal
;
3234 ext4_clear_journal_err(sb
, es
);
3236 if (journal_devnum
&&
3237 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3238 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
3240 /* Make sure we flush the recovery flag to disk. */
3241 ext4_commit_super(sb
, 1);
3247 static int ext4_commit_super(struct super_block
*sb
, int sync
)
3249 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
3250 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
3255 if (buffer_write_io_error(sbh
)) {
3257 * Oh, dear. A previous attempt to write the
3258 * superblock failed. This could happen because the
3259 * USB device was yanked out. Or it could happen to
3260 * be a transient write error and maybe the block will
3261 * be remapped. Nothing we can do but to retry the
3262 * write and hope for the best.
3264 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
3265 "superblock detected");
3266 clear_buffer_write_io_error(sbh
);
3267 set_buffer_uptodate(sbh
);
3270 * If the file system is mounted read-only, don't update the
3271 * superblock write time. This avoids updating the superblock
3272 * write time when we are mounting the root file system
3273 * read/only but we need to replay the journal; at that point,
3274 * for people who are east of GMT and who make their clock
3275 * tick in localtime for Windows bug-for-bug compatibility,
3276 * the clock is set in the future, and this will cause e2fsck
3277 * to complain and force a full file system check.
3279 if (!(sb
->s_flags
& MS_RDONLY
))
3280 es
->s_wtime
= cpu_to_le32(get_seconds());
3281 es
->s_kbytes_written
=
3282 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
3283 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
3284 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
3285 ext4_free_blocks_count_set(es
, percpu_counter_sum_positive(
3286 &EXT4_SB(sb
)->s_freeblocks_counter
));
3287 es
->s_free_inodes_count
= cpu_to_le32(percpu_counter_sum_positive(
3288 &EXT4_SB(sb
)->s_freeinodes_counter
));
3290 BUFFER_TRACE(sbh
, "marking dirty");
3291 mark_buffer_dirty(sbh
);
3293 error
= sync_dirty_buffer(sbh
);
3297 error
= buffer_write_io_error(sbh
);
3299 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
3301 clear_buffer_write_io_error(sbh
);
3302 set_buffer_uptodate(sbh
);
3309 * Have we just finished recovery? If so, and if we are mounting (or
3310 * remounting) the filesystem readonly, then we will end up with a
3311 * consistent fs on disk. Record that fact.
3313 static void ext4_mark_recovery_complete(struct super_block
*sb
,
3314 struct ext4_super_block
*es
)
3316 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
3318 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
3319 BUG_ON(journal
!= NULL
);
3322 jbd2_journal_lock_updates(journal
);
3323 if (jbd2_journal_flush(journal
) < 0)
3326 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
3327 sb
->s_flags
& MS_RDONLY
) {
3328 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3329 ext4_commit_super(sb
, 1);
3333 jbd2_journal_unlock_updates(journal
);
3337 * If we are mounting (or read-write remounting) a filesystem whose journal
3338 * has recorded an error from a previous lifetime, move that error to the
3339 * main filesystem now.
3341 static void ext4_clear_journal_err(struct super_block
*sb
,
3342 struct ext4_super_block
*es
)
3348 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3350 journal
= EXT4_SB(sb
)->s_journal
;
3353 * Now check for any error status which may have been recorded in the
3354 * journal by a prior ext4_error() or ext4_abort()
3357 j_errno
= jbd2_journal_errno(journal
);
3361 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
3362 ext4_warning(sb
, __func__
, "Filesystem error recorded "
3363 "from previous mount: %s", errstr
);
3364 ext4_warning(sb
, __func__
, "Marking fs in need of "
3365 "filesystem check.");
3367 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
3368 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
3369 ext4_commit_super(sb
, 1);
3371 jbd2_journal_clear_err(journal
);
3376 * Force the running and committing transactions to commit,
3377 * and wait on the commit.
3379 int ext4_force_commit(struct super_block
*sb
)
3384 if (sb
->s_flags
& MS_RDONLY
)
3387 journal
= EXT4_SB(sb
)->s_journal
;
3389 ret
= ext4_journal_force_commit(journal
);
3394 static void ext4_write_super(struct super_block
*sb
)
3397 ext4_commit_super(sb
, 1);
3401 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
3405 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3407 trace_ext4_sync_fs(sb
, wait
);
3408 flush_workqueue(sbi
->dio_unwritten_wq
);
3409 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
3411 jbd2_log_wait_commit(sbi
->s_journal
, target
);
3417 * LVM calls this function before a (read-only) snapshot is created. This
3418 * gives us a chance to flush the journal completely and mark the fs clean.
3420 static int ext4_freeze(struct super_block
*sb
)
3425 if (sb
->s_flags
& MS_RDONLY
)
3428 journal
= EXT4_SB(sb
)->s_journal
;
3430 /* Now we set up the journal barrier. */
3431 jbd2_journal_lock_updates(journal
);
3434 * Don't clear the needs_recovery flag if we failed to flush
3437 error
= jbd2_journal_flush(journal
);
3440 jbd2_journal_unlock_updates(journal
);
3444 /* Journal blocked and flushed, clear needs_recovery flag. */
3445 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3446 error
= ext4_commit_super(sb
, 1);
3453 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3454 * flag here, even though the filesystem is not technically dirty yet.
3456 static int ext4_unfreeze(struct super_block
*sb
)
3458 if (sb
->s_flags
& MS_RDONLY
)
3462 /* Reset the needs_recovery flag before the fs is unlocked. */
3463 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
3464 ext4_commit_super(sb
, 1);
3466 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
3470 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
3472 struct ext4_super_block
*es
;
3473 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3474 ext4_fsblk_t n_blocks_count
= 0;
3475 unsigned long old_sb_flags
;
3476 struct ext4_mount_options old_opts
;
3478 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3486 /* Store the original options */
3488 old_sb_flags
= sb
->s_flags
;
3489 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
3490 old_opts
.s_resuid
= sbi
->s_resuid
;
3491 old_opts
.s_resgid
= sbi
->s_resgid
;
3492 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
3493 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
3494 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
3496 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
3497 for (i
= 0; i
< MAXQUOTAS
; i
++)
3498 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
3500 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
3501 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
3504 * Allow the "check" option to be passed as a remount option.
3506 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
,
3507 &n_blocks_count
, 1)) {
3512 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
3513 ext4_abort(sb
, __func__
, "Abort forced by user");
3515 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3516 ((sbi
->s_mount_opt
& EXT4_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
3520 if (sbi
->s_journal
) {
3521 ext4_init_journal_params(sb
, sbi
->s_journal
);
3522 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
3525 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
) ||
3526 n_blocks_count
> ext4_blocks_count(es
)) {
3527 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
3532 if (*flags
& MS_RDONLY
) {
3534 * First of all, the unconditional stuff we have to do
3535 * to disable replay of the journal when we next remount
3537 sb
->s_flags
|= MS_RDONLY
;
3540 * OK, test if we are remounting a valid rw partition
3541 * readonly, and if so set the rdonly flag and then
3542 * mark the partition as valid again.
3544 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
3545 (sbi
->s_mount_state
& EXT4_VALID_FS
))
3546 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
3549 ext4_mark_recovery_complete(sb
, es
);
3551 /* Make sure we can mount this feature set readwrite */
3552 if (!ext4_feature_set_ok(sb
, 0)) {
3557 * Make sure the group descriptor checksums
3558 * are sane. If they aren't, refuse to remount r/w.
3560 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
3561 struct ext4_group_desc
*gdp
=
3562 ext4_get_group_desc(sb
, g
, NULL
);
3564 if (!ext4_group_desc_csum_verify(sbi
, g
, gdp
)) {
3565 ext4_msg(sb
, KERN_ERR
,
3566 "ext4_remount: Checksum for group %u failed (%u!=%u)",
3567 g
, le16_to_cpu(ext4_group_desc_csum(sbi
, g
, gdp
)),
3568 le16_to_cpu(gdp
->bg_checksum
));
3575 * If we have an unprocessed orphan list hanging
3576 * around from a previously readonly bdev mount,
3577 * require a full umount/remount for now.
3579 if (es
->s_last_orphan
) {
3580 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
3581 "remount RDWR because of unprocessed "
3582 "orphan inode list. Please "
3583 "umount/remount instead");
3589 * Mounting a RDONLY partition read-write, so reread
3590 * and store the current valid flag. (It may have
3591 * been changed by e2fsck since we originally mounted
3595 ext4_clear_journal_err(sb
, es
);
3596 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3597 if ((err
= ext4_group_extend(sb
, es
, n_blocks_count
)))
3599 if (!ext4_setup_super(sb
, es
, 0))
3600 sb
->s_flags
&= ~MS_RDONLY
;
3603 ext4_setup_system_zone(sb
);
3604 if (sbi
->s_journal
== NULL
)
3605 ext4_commit_super(sb
, 1);
3608 /* Release old quota file names */
3609 for (i
= 0; i
< MAXQUOTAS
; i
++)
3610 if (old_opts
.s_qf_names
[i
] &&
3611 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3612 kfree(old_opts
.s_qf_names
[i
]);
3619 sb
->s_flags
= old_sb_flags
;
3620 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
3621 sbi
->s_resuid
= old_opts
.s_resuid
;
3622 sbi
->s_resgid
= old_opts
.s_resgid
;
3623 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
3624 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
3625 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
3627 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
3628 for (i
= 0; i
< MAXQUOTAS
; i
++) {
3629 if (sbi
->s_qf_names
[i
] &&
3630 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3631 kfree(sbi
->s_qf_names
[i
]);
3632 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
3640 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
3642 struct super_block
*sb
= dentry
->d_sb
;
3643 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3644 struct ext4_super_block
*es
= sbi
->s_es
;
3647 if (test_opt(sb
, MINIX_DF
)) {
3648 sbi
->s_overhead_last
= 0;
3649 } else if (sbi
->s_blocks_last
!= ext4_blocks_count(es
)) {
3650 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3651 ext4_fsblk_t overhead
= 0;
3654 * Compute the overhead (FS structures). This is constant
3655 * for a given filesystem unless the number of block groups
3656 * changes so we cache the previous value until it does.
3660 * All of the blocks before first_data_block are
3663 overhead
= le32_to_cpu(es
->s_first_data_block
);
3666 * Add the overhead attributed to the superblock and
3667 * block group descriptors. If the sparse superblocks
3668 * feature is turned on, then not all groups have this.
3670 for (i
= 0; i
< ngroups
; i
++) {
3671 overhead
+= ext4_bg_has_super(sb
, i
) +
3672 ext4_bg_num_gdb(sb
, i
);
3677 * Every block group has an inode bitmap, a block
3678 * bitmap, and an inode table.
3680 overhead
+= ngroups
* (2 + sbi
->s_itb_per_group
);
3681 sbi
->s_overhead_last
= overhead
;
3683 sbi
->s_blocks_last
= ext4_blocks_count(es
);
3686 buf
->f_type
= EXT4_SUPER_MAGIC
;
3687 buf
->f_bsize
= sb
->s_blocksize
;
3688 buf
->f_blocks
= ext4_blocks_count(es
) - sbi
->s_overhead_last
;
3689 buf
->f_bfree
= percpu_counter_sum_positive(&sbi
->s_freeblocks_counter
) -
3690 percpu_counter_sum_positive(&sbi
->s_dirtyblocks_counter
);
3691 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
3692 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
3694 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
3695 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
3696 buf
->f_namelen
= EXT4_NAME_LEN
;
3697 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
3698 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
3699 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
3700 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
3705 /* Helper function for writing quotas on sync - we need to start transaction
3706 * before quota file is locked for write. Otherwise the are possible deadlocks:
3707 * Process 1 Process 2
3708 * ext4_create() quota_sync()
3709 * jbd2_journal_start() write_dquot()
3710 * vfs_dq_init() down(dqio_mutex)
3711 * down(dqio_mutex) jbd2_journal_start()
3717 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
3719 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_type
];
3722 static int ext4_write_dquot(struct dquot
*dquot
)
3726 struct inode
*inode
;
3728 inode
= dquot_to_inode(dquot
);
3729 handle
= ext4_journal_start(inode
,
3730 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
3732 return PTR_ERR(handle
);
3733 ret
= dquot_commit(dquot
);
3734 err
= ext4_journal_stop(handle
);
3740 static int ext4_acquire_dquot(struct dquot
*dquot
)
3745 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3746 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
3748 return PTR_ERR(handle
);
3749 ret
= dquot_acquire(dquot
);
3750 err
= ext4_journal_stop(handle
);
3756 static int ext4_release_dquot(struct dquot
*dquot
)
3761 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3762 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
3763 if (IS_ERR(handle
)) {
3764 /* Release dquot anyway to avoid endless cycle in dqput() */
3765 dquot_release(dquot
);
3766 return PTR_ERR(handle
);
3768 ret
= dquot_release(dquot
);
3769 err
= ext4_journal_stop(handle
);
3775 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
3777 /* Are we journaling quotas? */
3778 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
3779 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
3780 dquot_mark_dquot_dirty(dquot
);
3781 return ext4_write_dquot(dquot
);
3783 return dquot_mark_dquot_dirty(dquot
);
3787 static int ext4_write_info(struct super_block
*sb
, int type
)
3792 /* Data block + inode block */
3793 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
3795 return PTR_ERR(handle
);
3796 ret
= dquot_commit_info(sb
, type
);
3797 err
= ext4_journal_stop(handle
);
3804 * Turn on quotas during mount time - we need to find
3805 * the quota file and such...
3807 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
3809 return vfs_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
3810 EXT4_SB(sb
)->s_jquota_fmt
, type
);
3814 * Standard function to be called on quota_on
3816 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
3817 char *name
, int remount
)
3822 if (!test_opt(sb
, QUOTA
))
3824 /* When remounting, no checks are needed and in fact, name is NULL */
3826 return vfs_quota_on(sb
, type
, format_id
, name
, remount
);
3828 err
= kern_path(name
, LOOKUP_FOLLOW
, &path
);
3832 /* Quotafile not on the same filesystem? */
3833 if (path
.mnt
->mnt_sb
!= sb
) {
3837 /* Journaling quota? */
3838 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
3839 /* Quotafile not in fs root? */
3840 if (path
.dentry
->d_parent
!= sb
->s_root
)
3841 ext4_msg(sb
, KERN_WARNING
,
3842 "Quota file not on filesystem root. "
3843 "Journaled quota will not work");
3847 * When we journal data on quota file, we have to flush journal to see
3848 * all updates to the file when we bypass pagecache...
3850 if (EXT4_SB(sb
)->s_journal
&&
3851 ext4_should_journal_data(path
.dentry
->d_inode
)) {
3853 * We don't need to lock updates but journal_flush() could
3854 * otherwise be livelocked...
3856 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
3857 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
3858 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
3865 err
= vfs_quota_on_path(sb
, type
, format_id
, &path
);
3870 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3871 * acquiring the locks... As quota files are never truncated and quota code
3872 * itself serializes the operations (and noone else should touch the files)
3873 * we don't have to be afraid of races */
3874 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
3875 size_t len
, loff_t off
)
3877 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
3878 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
3880 int offset
= off
& (sb
->s_blocksize
- 1);
3883 struct buffer_head
*bh
;
3884 loff_t i_size
= i_size_read(inode
);
3888 if (off
+len
> i_size
)
3891 while (toread
> 0) {
3892 tocopy
= sb
->s_blocksize
- offset
< toread
?
3893 sb
->s_blocksize
- offset
: toread
;
3894 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
3897 if (!bh
) /* A hole? */
3898 memset(data
, 0, tocopy
);
3900 memcpy(data
, bh
->b_data
+offset
, tocopy
);
3910 /* Write to quotafile (we know the transaction is already started and has
3911 * enough credits) */
3912 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
3913 const char *data
, size_t len
, loff_t off
)
3915 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
3916 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
3918 int offset
= off
& (sb
->s_blocksize
- 1);
3920 int journal_quota
= EXT4_SB(sb
)->s_qf_names
[type
] != NULL
;
3921 size_t towrite
= len
;
3922 struct buffer_head
*bh
;
3923 handle_t
*handle
= journal_current_handle();
3925 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
3926 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
3927 " cancelled because transaction is not started",
3928 (unsigned long long)off
, (unsigned long long)len
);
3931 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
3932 while (towrite
> 0) {
3933 tocopy
= sb
->s_blocksize
- offset
< towrite
?
3934 sb
->s_blocksize
- offset
: towrite
;
3935 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
3938 if (journal_quota
) {
3939 err
= ext4_journal_get_write_access(handle
, bh
);
3946 memcpy(bh
->b_data
+offset
, data
, tocopy
);
3947 flush_dcache_page(bh
->b_page
);
3950 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
3952 /* Always do at least ordered writes for quotas */
3953 err
= ext4_jbd2_file_inode(handle
, inode
);
3954 mark_buffer_dirty(bh
);
3965 if (len
== towrite
) {
3966 mutex_unlock(&inode
->i_mutex
);
3969 if (inode
->i_size
< off
+len
-towrite
) {
3970 i_size_write(inode
, off
+len
-towrite
);
3971 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
3973 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
3974 ext4_mark_inode_dirty(handle
, inode
);
3975 mutex_unlock(&inode
->i_mutex
);
3976 return len
- towrite
;
3981 static int ext4_get_sb(struct file_system_type
*fs_type
, int flags
,
3982 const char *dev_name
, void *data
, struct vfsmount
*mnt
)
3984 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
,mnt
);
3987 #if !defined(CONTIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
3988 static struct file_system_type ext2_fs_type
= {
3989 .owner
= THIS_MODULE
,
3991 .get_sb
= ext4_get_sb
,
3992 .kill_sb
= kill_block_super
,
3993 .fs_flags
= FS_REQUIRES_DEV
,
3996 static inline void register_as_ext2(void)
3998 int err
= register_filesystem(&ext2_fs_type
);
4001 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
4004 static inline void unregister_as_ext2(void)
4006 unregister_filesystem(&ext2_fs_type
);
4009 static inline void register_as_ext2(void) { }
4010 static inline void unregister_as_ext2(void) { }
4013 #if !defined(CONTIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4014 static struct file_system_type ext3_fs_type
= {
4015 .owner
= THIS_MODULE
,
4017 .get_sb
= ext4_get_sb
,
4018 .kill_sb
= kill_block_super
,
4019 .fs_flags
= FS_REQUIRES_DEV
,
4022 static inline void register_as_ext3(void)
4024 int err
= register_filesystem(&ext3_fs_type
);
4027 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
4030 static inline void unregister_as_ext3(void)
4032 unregister_filesystem(&ext3_fs_type
);
4035 static inline void register_as_ext3(void) { }
4036 static inline void unregister_as_ext3(void) { }
4039 static struct file_system_type ext4_fs_type
= {
4040 .owner
= THIS_MODULE
,
4042 .get_sb
= ext4_get_sb
,
4043 .kill_sb
= kill_block_super
,
4044 .fs_flags
= FS_REQUIRES_DEV
,
4047 static int __init
init_ext4_fs(void)
4051 err
= init_ext4_system_zone();
4054 ext4_kset
= kset_create_and_add("ext4", NULL
, fs_kobj
);
4057 ext4_proc_root
= proc_mkdir("fs/ext4", NULL
);
4058 err
= init_ext4_mballoc();
4062 err
= init_ext4_xattr();
4065 err
= init_inodecache();
4070 err
= register_filesystem(&ext4_fs_type
);
4075 unregister_as_ext2();
4076 unregister_as_ext3();
4077 destroy_inodecache();
4081 exit_ext4_mballoc();
4083 remove_proc_entry("fs/ext4", NULL
);
4084 kset_unregister(ext4_kset
);
4086 exit_ext4_system_zone();
4090 static void __exit
exit_ext4_fs(void)
4092 unregister_as_ext2();
4093 unregister_as_ext3();
4094 unregister_filesystem(&ext4_fs_type
);
4095 destroy_inodecache();
4097 exit_ext4_mballoc();
4098 remove_proc_entry("fs/ext4", NULL
);
4099 kset_unregister(ext4_kset
);
4100 exit_ext4_system_zone();
4103 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4104 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4105 MODULE_LICENSE("GPL");
4106 module_init(init_ext4_fs
)
4107 module_exit(exit_ext4_fs
)