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/jbd2.h>
24 #include <linux/slab.h>
25 #include <linux/init.h>
26 #include <linux/blkdev.h>
27 #include <linux/parser.h>
28 #include <linux/smp_lock.h>
29 #include <linux/buffer_head.h>
30 #include <linux/exportfs.h>
31 #include <linux/vfs.h>
32 #include <linux/random.h>
33 #include <linux/mount.h>
34 #include <linux/namei.h>
35 #include <linux/quotaops.h>
36 #include <linux/seq_file.h>
37 #include <linux/log2.h>
38 #include <linux/crc16.h>
39 #include <asm/uaccess.h>
42 #include "ext4_jbd2.h"
48 static int ext4_load_journal(struct super_block
*, struct ext4_super_block
*,
49 unsigned long journal_devnum
);
50 static int ext4_create_journal(struct super_block
*, struct ext4_super_block
*,
52 static void ext4_commit_super (struct super_block
* sb
,
53 struct ext4_super_block
* es
,
55 static void ext4_mark_recovery_complete(struct super_block
* sb
,
56 struct ext4_super_block
* es
);
57 static void ext4_clear_journal_err(struct super_block
* sb
,
58 struct ext4_super_block
* es
);
59 static int ext4_sync_fs(struct super_block
*sb
, int wait
);
60 static const char *ext4_decode_error(struct super_block
* sb
, int errno
,
62 static int ext4_remount (struct super_block
* sb
, int * flags
, char * data
);
63 static int ext4_statfs (struct dentry
* dentry
, struct kstatfs
* buf
);
64 static void ext4_unlockfs(struct super_block
*sb
);
65 static void ext4_write_super (struct super_block
* sb
);
66 static void ext4_write_super_lockfs(struct super_block
*sb
);
69 ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
70 struct ext4_group_desc
*bg
)
72 return le32_to_cpu(bg
->bg_block_bitmap_lo
) |
73 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
74 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
77 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
78 struct ext4_group_desc
*bg
)
80 return le32_to_cpu(bg
->bg_inode_bitmap_lo
) |
81 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
82 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
85 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
86 struct ext4_group_desc
*bg
)
88 return le32_to_cpu(bg
->bg_inode_table_lo
) |
89 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
90 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
93 void ext4_block_bitmap_set(struct super_block
*sb
,
94 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
96 bg
->bg_block_bitmap_lo
= cpu_to_le32((u32
)blk
);
97 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
98 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
101 void ext4_inode_bitmap_set(struct super_block
*sb
,
102 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
104 bg
->bg_inode_bitmap_lo
= cpu_to_le32((u32
)blk
);
105 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
106 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
109 void ext4_inode_table_set(struct super_block
*sb
,
110 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
112 bg
->bg_inode_table_lo
= cpu_to_le32((u32
)blk
);
113 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
114 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
118 * Wrappers for jbd2_journal_start/end.
120 * The only special thing we need to do here is to make sure that all
121 * journal_end calls result in the superblock being marked dirty, so
122 * that sync() will call the filesystem's write_super callback if
125 handle_t
*ext4_journal_start_sb(struct super_block
*sb
, int nblocks
)
129 if (sb
->s_flags
& MS_RDONLY
)
130 return ERR_PTR(-EROFS
);
132 /* Special case here: if the journal has aborted behind our
133 * backs (eg. EIO in the commit thread), then we still need to
134 * take the FS itself readonly cleanly. */
135 journal
= EXT4_SB(sb
)->s_journal
;
136 if (is_journal_aborted(journal
)) {
137 ext4_abort(sb
, __func__
,
138 "Detected aborted journal");
139 return ERR_PTR(-EROFS
);
142 return jbd2_journal_start(journal
, nblocks
);
146 * The only special thing we need to do here is to make sure that all
147 * jbd2_journal_stop calls result in the superblock being marked dirty, so
148 * that sync() will call the filesystem's write_super callback if
151 int __ext4_journal_stop(const char *where
, handle_t
*handle
)
153 struct super_block
*sb
;
157 sb
= handle
->h_transaction
->t_journal
->j_private
;
159 rc
= jbd2_journal_stop(handle
);
164 __ext4_std_error(sb
, where
, err
);
168 void ext4_journal_abort_handle(const char *caller
, const char *err_fn
,
169 struct buffer_head
*bh
, handle_t
*handle
, int err
)
172 const char *errstr
= ext4_decode_error(NULL
, err
, nbuf
);
175 BUFFER_TRACE(bh
, "abort");
180 if (is_handle_aborted(handle
))
183 printk(KERN_ERR
"%s: aborting transaction: %s in %s\n",
184 caller
, errstr
, err_fn
);
186 jbd2_journal_abort_handle(handle
);
189 /* Deal with the reporting of failure conditions on a filesystem such as
190 * inconsistencies detected or read IO failures.
192 * On ext2, we can store the error state of the filesystem in the
193 * superblock. That is not possible on ext4, because we may have other
194 * write ordering constraints on the superblock which prevent us from
195 * writing it out straight away; and given that the journal is about to
196 * be aborted, we can't rely on the current, or future, transactions to
197 * write out the superblock safely.
199 * We'll just use the jbd2_journal_abort() error code to record an error in
200 * the journal instead. On recovery, the journal will compain about
201 * that error until we've noted it down and cleared it.
204 static void ext4_handle_error(struct super_block
*sb
)
206 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
208 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
209 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
211 if (sb
->s_flags
& MS_RDONLY
)
214 if (!test_opt (sb
, ERRORS_CONT
)) {
215 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
217 EXT4_SB(sb
)->s_mount_opt
|= EXT4_MOUNT_ABORT
;
219 jbd2_journal_abort(journal
, -EIO
);
221 if (test_opt (sb
, ERRORS_RO
)) {
222 printk (KERN_CRIT
"Remounting filesystem read-only\n");
223 sb
->s_flags
|= MS_RDONLY
;
225 ext4_commit_super(sb
, es
, 1);
226 if (test_opt(sb
, ERRORS_PANIC
))
227 panic("EXT4-fs (device %s): panic forced after error\n",
231 void ext4_error (struct super_block
* sb
, const char * function
,
232 const char * fmt
, ...)
237 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ",sb
->s_id
, function
);
242 ext4_handle_error(sb
);
245 static const char *ext4_decode_error(struct super_block
* sb
, int errno
,
252 errstr
= "IO failure";
255 errstr
= "Out of memory";
258 if (!sb
|| EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
)
259 errstr
= "Journal has aborted";
261 errstr
= "Readonly filesystem";
264 /* If the caller passed in an extra buffer for unknown
265 * errors, textualise them now. Else we just return
268 /* Check for truncated error codes... */
269 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
278 /* __ext4_std_error decodes expected errors from journaling functions
279 * automatically and invokes the appropriate error response. */
281 void __ext4_std_error (struct super_block
* sb
, const char * function
,
287 /* Special case: if the error is EROFS, and we're not already
288 * inside a transaction, then there's really no point in logging
290 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
291 (sb
->s_flags
& MS_RDONLY
))
294 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
295 printk (KERN_CRIT
"EXT4-fs error (device %s) in %s: %s\n",
296 sb
->s_id
, function
, errstr
);
298 ext4_handle_error(sb
);
302 * ext4_abort is a much stronger failure handler than ext4_error. The
303 * abort function may be used to deal with unrecoverable failures such
304 * as journal IO errors or ENOMEM at a critical moment in log management.
306 * We unconditionally force the filesystem into an ABORT|READONLY state,
307 * unless the error response on the fs has been set to panic in which
308 * case we take the easy way out and panic immediately.
311 void ext4_abort (struct super_block
* sb
, const char * function
,
312 const char * fmt
, ...)
316 printk (KERN_CRIT
"ext4_abort called.\n");
319 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ",sb
->s_id
, function
);
324 if (test_opt(sb
, ERRORS_PANIC
))
325 panic("EXT4-fs panic from previous error\n");
327 if (sb
->s_flags
& MS_RDONLY
)
330 printk(KERN_CRIT
"Remounting filesystem read-only\n");
331 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
332 sb
->s_flags
|= MS_RDONLY
;
333 EXT4_SB(sb
)->s_mount_opt
|= EXT4_MOUNT_ABORT
;
334 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
337 void ext4_warning (struct super_block
* sb
, const char * function
,
338 const char * fmt
, ...)
343 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s: ",
350 void ext4_update_dynamic_rev(struct super_block
*sb
)
352 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
354 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
357 ext4_warning(sb
, __func__
,
358 "updating to rev %d because of new feature flag, "
359 "running e2fsck is recommended",
362 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
363 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
364 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
365 /* leave es->s_feature_*compat flags alone */
366 /* es->s_uuid will be set by e2fsck if empty */
369 * The rest of the superblock fields should be zero, and if not it
370 * means they are likely already in use, so leave them alone. We
371 * can leave it up to e2fsck to clean up any inconsistencies there.
375 int ext4_update_compat_feature(handle_t
*handle
,
376 struct super_block
*sb
, __u32 compat
)
379 if (!EXT4_HAS_COMPAT_FEATURE(sb
, compat
)) {
380 err
= ext4_journal_get_write_access(handle
,
384 EXT4_SET_COMPAT_FEATURE(sb
, compat
);
387 BUFFER_TRACE(EXT4_SB(sb
)->s_sbh
,
388 "call ext4_journal_dirty_met adata");
389 err
= ext4_journal_dirty_metadata(handle
,
395 int ext4_update_rocompat_feature(handle_t
*handle
,
396 struct super_block
*sb
, __u32 rocompat
)
399 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, rocompat
)) {
400 err
= ext4_journal_get_write_access(handle
,
404 EXT4_SET_RO_COMPAT_FEATURE(sb
, rocompat
);
407 BUFFER_TRACE(EXT4_SB(sb
)->s_sbh
,
408 "call ext4_journal_dirty_met adata");
409 err
= ext4_journal_dirty_metadata(handle
,
415 int ext4_update_incompat_feature(handle_t
*handle
,
416 struct super_block
*sb
, __u32 incompat
)
419 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, incompat
)) {
420 err
= ext4_journal_get_write_access(handle
,
424 EXT4_SET_INCOMPAT_FEATURE(sb
, incompat
);
427 BUFFER_TRACE(EXT4_SB(sb
)->s_sbh
,
428 "call ext4_journal_dirty_met adata");
429 err
= ext4_journal_dirty_metadata(handle
,
436 * Open the external journal device
438 static struct block_device
*ext4_blkdev_get(dev_t dev
)
440 struct block_device
*bdev
;
441 char b
[BDEVNAME_SIZE
];
443 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
449 printk(KERN_ERR
"EXT4: failed to open journal device %s: %ld\n",
450 __bdevname(dev
, b
), PTR_ERR(bdev
));
455 * Release the journal device
457 static int ext4_blkdev_put(struct block_device
*bdev
)
460 return blkdev_put(bdev
);
463 static int ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
465 struct block_device
*bdev
;
468 bdev
= sbi
->journal_bdev
;
470 ret
= ext4_blkdev_put(bdev
);
471 sbi
->journal_bdev
= NULL
;
476 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
478 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
481 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
485 printk(KERN_ERR
"sb orphan head is %d\n",
486 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
488 printk(KERN_ERR
"sb_info orphan list:\n");
489 list_for_each(l
, &sbi
->s_orphan
) {
490 struct inode
*inode
= orphan_list_entry(l
);
492 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
493 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
494 inode
->i_mode
, inode
->i_nlink
,
499 static void ext4_put_super (struct super_block
* sb
)
501 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
502 struct ext4_super_block
*es
= sbi
->s_es
;
506 ext4_ext_release(sb
);
507 ext4_xattr_put_super(sb
);
508 jbd2_journal_destroy(sbi
->s_journal
);
509 sbi
->s_journal
= NULL
;
510 if (!(sb
->s_flags
& MS_RDONLY
)) {
511 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
512 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
513 BUFFER_TRACE(sbi
->s_sbh
, "marking dirty");
514 mark_buffer_dirty(sbi
->s_sbh
);
515 ext4_commit_super(sb
, es
, 1);
518 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
519 brelse(sbi
->s_group_desc
[i
]);
520 kfree(sbi
->s_group_desc
);
521 kfree(sbi
->s_flex_groups
);
522 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
523 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
524 percpu_counter_destroy(&sbi
->s_dirs_counter
);
527 for (i
= 0; i
< MAXQUOTAS
; i
++)
528 kfree(sbi
->s_qf_names
[i
]);
531 /* Debugging code just in case the in-memory inode orphan list
532 * isn't empty. The on-disk one can be non-empty if we've
533 * detected an error and taken the fs readonly, but the
534 * in-memory list had better be clean by this point. */
535 if (!list_empty(&sbi
->s_orphan
))
536 dump_orphan_list(sb
, sbi
);
537 J_ASSERT(list_empty(&sbi
->s_orphan
));
539 invalidate_bdev(sb
->s_bdev
);
540 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
542 * Invalidate the journal device's buffers. We don't want them
543 * floating about in memory - the physical journal device may
544 * hotswapped, and it breaks the `ro-after' testing code.
546 sync_blockdev(sbi
->journal_bdev
);
547 invalidate_bdev(sbi
->journal_bdev
);
548 ext4_blkdev_remove(sbi
);
550 sb
->s_fs_info
= NULL
;
555 static struct kmem_cache
*ext4_inode_cachep
;
558 * Called inside transaction, so use GFP_NOFS
560 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
562 struct ext4_inode_info
*ei
;
564 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
567 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
568 ei
->i_acl
= EXT4_ACL_NOT_CACHED
;
569 ei
->i_default_acl
= EXT4_ACL_NOT_CACHED
;
571 ei
->i_block_alloc_info
= NULL
;
572 ei
->vfs_inode
.i_version
= 1;
573 memset(&ei
->i_cached_extent
, 0, sizeof(struct ext4_ext_cache
));
574 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
575 spin_lock_init(&ei
->i_prealloc_lock
);
576 jbd2_journal_init_jbd_inode(&ei
->jinode
, &ei
->vfs_inode
);
577 ei
->i_reserved_data_blocks
= 0;
578 ei
->i_reserved_meta_blocks
= 0;
579 ei
->i_allocated_meta_blocks
= 0;
580 ei
->i_delalloc_reserved_flag
= 0;
581 spin_lock_init(&(ei
->i_block_reservation_lock
));
582 return &ei
->vfs_inode
;
585 static void ext4_destroy_inode(struct inode
*inode
)
587 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
588 printk("EXT4 Inode %p: orphan list check failed!\n",
590 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
591 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
595 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
598 static void init_once(void *foo
)
600 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
602 INIT_LIST_HEAD(&ei
->i_orphan
);
603 #ifdef CONFIG_EXT4DEV_FS_XATTR
604 init_rwsem(&ei
->xattr_sem
);
606 init_rwsem(&ei
->i_data_sem
);
607 inode_init_once(&ei
->vfs_inode
);
610 static int init_inodecache(void)
612 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
613 sizeof(struct ext4_inode_info
),
614 0, (SLAB_RECLAIM_ACCOUNT
|
617 if (ext4_inode_cachep
== NULL
)
622 static void destroy_inodecache(void)
624 kmem_cache_destroy(ext4_inode_cachep
);
627 static void ext4_clear_inode(struct inode
*inode
)
629 struct ext4_block_alloc_info
*rsv
= EXT4_I(inode
)->i_block_alloc_info
;
630 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
631 if (EXT4_I(inode
)->i_acl
&&
632 EXT4_I(inode
)->i_acl
!= EXT4_ACL_NOT_CACHED
) {
633 posix_acl_release(EXT4_I(inode
)->i_acl
);
634 EXT4_I(inode
)->i_acl
= EXT4_ACL_NOT_CACHED
;
636 if (EXT4_I(inode
)->i_default_acl
&&
637 EXT4_I(inode
)->i_default_acl
!= EXT4_ACL_NOT_CACHED
) {
638 posix_acl_release(EXT4_I(inode
)->i_default_acl
);
639 EXT4_I(inode
)->i_default_acl
= EXT4_ACL_NOT_CACHED
;
642 ext4_discard_reservation(inode
);
643 EXT4_I(inode
)->i_block_alloc_info
= NULL
;
646 jbd2_journal_release_jbd_inode(EXT4_SB(inode
->i_sb
)->s_journal
,
647 &EXT4_I(inode
)->jinode
);
650 static inline void ext4_show_quota_options(struct seq_file
*seq
, struct super_block
*sb
)
652 #if defined(CONFIG_QUOTA)
653 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
655 if (sbi
->s_jquota_fmt
)
656 seq_printf(seq
, ",jqfmt=%s",
657 (sbi
->s_jquota_fmt
== QFMT_VFS_OLD
) ? "vfsold": "vfsv0");
659 if (sbi
->s_qf_names
[USRQUOTA
])
660 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
662 if (sbi
->s_qf_names
[GRPQUOTA
])
663 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
665 if (sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
)
666 seq_puts(seq
, ",usrquota");
668 if (sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
)
669 seq_puts(seq
, ",grpquota");
675 * - it's set to a non-default value OR
676 * - if the per-sb default is different from the global default
678 static int ext4_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
681 unsigned long def_mount_opts
;
682 struct super_block
*sb
= vfs
->mnt_sb
;
683 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
684 struct ext4_super_block
*es
= sbi
->s_es
;
686 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
687 def_errors
= le16_to_cpu(es
->s_errors
);
689 if (sbi
->s_sb_block
!= 1)
690 seq_printf(seq
, ",sb=%llu", sbi
->s_sb_block
);
691 if (test_opt(sb
, MINIX_DF
))
692 seq_puts(seq
, ",minixdf");
693 if (test_opt(sb
, GRPID
) && !(def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
694 seq_puts(seq
, ",grpid");
695 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
696 seq_puts(seq
, ",nogrpid");
697 if (sbi
->s_resuid
!= EXT4_DEF_RESUID
||
698 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
) {
699 seq_printf(seq
, ",resuid=%u", sbi
->s_resuid
);
701 if (sbi
->s_resgid
!= EXT4_DEF_RESGID
||
702 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
) {
703 seq_printf(seq
, ",resgid=%u", sbi
->s_resgid
);
705 if (test_opt(sb
, ERRORS_RO
)) {
706 if (def_errors
== EXT4_ERRORS_PANIC
||
707 def_errors
== EXT4_ERRORS_CONTINUE
) {
708 seq_puts(seq
, ",errors=remount-ro");
711 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
712 seq_puts(seq
, ",errors=continue");
713 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
714 seq_puts(seq
, ",errors=panic");
715 if (test_opt(sb
, NO_UID32
) && !(def_mount_opts
& EXT4_DEFM_UID16
))
716 seq_puts(seq
, ",nouid32");
717 if (test_opt(sb
, DEBUG
) && !(def_mount_opts
& EXT4_DEFM_DEBUG
))
718 seq_puts(seq
, ",debug");
719 if (test_opt(sb
, OLDALLOC
))
720 seq_puts(seq
, ",oldalloc");
721 #ifdef CONFIG_EXT4DEV_FS_XATTR
722 if (test_opt(sb
, XATTR_USER
) &&
723 !(def_mount_opts
& EXT4_DEFM_XATTR_USER
))
724 seq_puts(seq
, ",user_xattr");
725 if (!test_opt(sb
, XATTR_USER
) &&
726 (def_mount_opts
& EXT4_DEFM_XATTR_USER
)) {
727 seq_puts(seq
, ",nouser_xattr");
730 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
731 if (test_opt(sb
, POSIX_ACL
) && !(def_mount_opts
& EXT4_DEFM_ACL
))
732 seq_puts(seq
, ",acl");
733 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT4_DEFM_ACL
))
734 seq_puts(seq
, ",noacl");
736 if (!test_opt(sb
, RESERVATION
))
737 seq_puts(seq
, ",noreservation");
738 if (sbi
->s_commit_interval
) {
739 seq_printf(seq
, ",commit=%u",
740 (unsigned) (sbi
->s_commit_interval
/ HZ
));
743 * We're changing the default of barrier mount option, so
744 * let's always display its mount state so it's clear what its
747 seq_puts(seq
, ",barrier=");
748 seq_puts(seq
, test_opt(sb
, BARRIER
) ? "1" : "0");
749 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
))
750 seq_puts(seq
, ",journal_async_commit");
751 if (test_opt(sb
, NOBH
))
752 seq_puts(seq
, ",nobh");
753 if (!test_opt(sb
, EXTENTS
))
754 seq_puts(seq
, ",noextents");
755 if (!test_opt(sb
, MBALLOC
))
756 seq_puts(seq
, ",nomballoc");
757 if (test_opt(sb
, I_VERSION
))
758 seq_puts(seq
, ",i_version");
759 if (!test_opt(sb
, DELALLOC
))
760 seq_puts(seq
, ",nodelalloc");
764 seq_printf(seq
, ",stripe=%lu", sbi
->s_stripe
);
766 * journal mode get enabled in different ways
767 * So just print the value even if we didn't specify it
769 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
770 seq_puts(seq
, ",data=journal");
771 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
772 seq_puts(seq
, ",data=ordered");
773 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
774 seq_puts(seq
, ",data=writeback");
776 ext4_show_quota_options(seq
, sb
);
781 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
782 u64 ino
, u32 generation
)
786 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
787 return ERR_PTR(-ESTALE
);
788 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
789 return ERR_PTR(-ESTALE
);
791 /* iget isn't really right if the inode is currently unallocated!!
793 * ext4_read_inode will return a bad_inode if the inode had been
794 * deleted, so we should be safe.
796 * Currently we don't know the generation for parent directory, so
797 * a generation of 0 means "accept any"
799 inode
= ext4_iget(sb
, ino
);
801 return ERR_CAST(inode
);
802 if (generation
&& inode
->i_generation
!= generation
) {
804 return ERR_PTR(-ESTALE
);
810 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
811 int fh_len
, int fh_type
)
813 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
817 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
818 int fh_len
, int fh_type
)
820 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
825 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
826 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
828 static int ext4_dquot_initialize(struct inode
*inode
, int type
);
829 static int ext4_dquot_drop(struct inode
*inode
);
830 static int ext4_write_dquot(struct dquot
*dquot
);
831 static int ext4_acquire_dquot(struct dquot
*dquot
);
832 static int ext4_release_dquot(struct dquot
*dquot
);
833 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
834 static int ext4_write_info(struct super_block
*sb
, int type
);
835 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
836 char *path
, int remount
);
837 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
838 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
839 size_t len
, loff_t off
);
840 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
841 const char *data
, size_t len
, loff_t off
);
843 static struct dquot_operations ext4_quota_operations
= {
844 .initialize
= ext4_dquot_initialize
,
845 .drop
= ext4_dquot_drop
,
846 .alloc_space
= dquot_alloc_space
,
847 .alloc_inode
= dquot_alloc_inode
,
848 .free_space
= dquot_free_space
,
849 .free_inode
= dquot_free_inode
,
850 .transfer
= dquot_transfer
,
851 .write_dquot
= ext4_write_dquot
,
852 .acquire_dquot
= ext4_acquire_dquot
,
853 .release_dquot
= ext4_release_dquot
,
854 .mark_dirty
= ext4_mark_dquot_dirty
,
855 .write_info
= ext4_write_info
858 static struct quotactl_ops ext4_qctl_operations
= {
859 .quota_on
= ext4_quota_on
,
860 .quota_off
= vfs_quota_off
,
861 .quota_sync
= vfs_quota_sync
,
862 .get_info
= vfs_get_dqinfo
,
863 .set_info
= vfs_set_dqinfo
,
864 .get_dqblk
= vfs_get_dqblk
,
865 .set_dqblk
= vfs_set_dqblk
869 static const struct super_operations ext4_sops
= {
870 .alloc_inode
= ext4_alloc_inode
,
871 .destroy_inode
= ext4_destroy_inode
,
872 .write_inode
= ext4_write_inode
,
873 .dirty_inode
= ext4_dirty_inode
,
874 .delete_inode
= ext4_delete_inode
,
875 .put_super
= ext4_put_super
,
876 .write_super
= ext4_write_super
,
877 .sync_fs
= ext4_sync_fs
,
878 .write_super_lockfs
= ext4_write_super_lockfs
,
879 .unlockfs
= ext4_unlockfs
,
880 .statfs
= ext4_statfs
,
881 .remount_fs
= ext4_remount
,
882 .clear_inode
= ext4_clear_inode
,
883 .show_options
= ext4_show_options
,
885 .quota_read
= ext4_quota_read
,
886 .quota_write
= ext4_quota_write
,
890 static const struct export_operations ext4_export_ops
= {
891 .fh_to_dentry
= ext4_fh_to_dentry
,
892 .fh_to_parent
= ext4_fh_to_parent
,
893 .get_parent
= ext4_get_parent
,
897 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
898 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
899 Opt_nouid32
, Opt_nocheck
, Opt_debug
, Opt_oldalloc
, Opt_orlov
,
900 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
901 Opt_reservation
, Opt_noreservation
, Opt_noload
, Opt_nobh
, Opt_bh
,
902 Opt_commit
, Opt_journal_update
, Opt_journal_inum
, Opt_journal_dev
,
903 Opt_journal_checksum
, Opt_journal_async_commit
,
904 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
905 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
906 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_quota
, Opt_noquota
,
907 Opt_ignore
, Opt_barrier
, Opt_err
, Opt_resize
, Opt_usrquota
,
908 Opt_grpquota
, Opt_extents
, Opt_noextents
, Opt_i_version
,
909 Opt_mballoc
, Opt_nomballoc
, Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
,
912 static match_table_t tokens
= {
913 {Opt_bsd_df
, "bsddf"},
914 {Opt_minix_df
, "minixdf"},
915 {Opt_grpid
, "grpid"},
916 {Opt_grpid
, "bsdgroups"},
917 {Opt_nogrpid
, "nogrpid"},
918 {Opt_nogrpid
, "sysvgroups"},
919 {Opt_resgid
, "resgid=%u"},
920 {Opt_resuid
, "resuid=%u"},
922 {Opt_err_cont
, "errors=continue"},
923 {Opt_err_panic
, "errors=panic"},
924 {Opt_err_ro
, "errors=remount-ro"},
925 {Opt_nouid32
, "nouid32"},
926 {Opt_nocheck
, "nocheck"},
927 {Opt_nocheck
, "check=none"},
928 {Opt_debug
, "debug"},
929 {Opt_oldalloc
, "oldalloc"},
930 {Opt_orlov
, "orlov"},
931 {Opt_user_xattr
, "user_xattr"},
932 {Opt_nouser_xattr
, "nouser_xattr"},
934 {Opt_noacl
, "noacl"},
935 {Opt_reservation
, "reservation"},
936 {Opt_noreservation
, "noreservation"},
937 {Opt_noload
, "noload"},
940 {Opt_commit
, "commit=%u"},
941 {Opt_journal_update
, "journal=update"},
942 {Opt_journal_inum
, "journal=%u"},
943 {Opt_journal_dev
, "journal_dev=%u"},
944 {Opt_journal_checksum
, "journal_checksum"},
945 {Opt_journal_async_commit
, "journal_async_commit"},
946 {Opt_abort
, "abort"},
947 {Opt_data_journal
, "data=journal"},
948 {Opt_data_ordered
, "data=ordered"},
949 {Opt_data_writeback
, "data=writeback"},
950 {Opt_offusrjquota
, "usrjquota="},
951 {Opt_usrjquota
, "usrjquota=%s"},
952 {Opt_offgrpjquota
, "grpjquota="},
953 {Opt_grpjquota
, "grpjquota=%s"},
954 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
955 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
956 {Opt_grpquota
, "grpquota"},
957 {Opt_noquota
, "noquota"},
958 {Opt_quota
, "quota"},
959 {Opt_usrquota
, "usrquota"},
960 {Opt_barrier
, "barrier=%u"},
961 {Opt_extents
, "extents"},
962 {Opt_noextents
, "noextents"},
963 {Opt_i_version
, "i_version"},
964 {Opt_mballoc
, "mballoc"},
965 {Opt_nomballoc
, "nomballoc"},
966 {Opt_stripe
, "stripe=%u"},
967 {Opt_resize
, "resize"},
968 {Opt_delalloc
, "delalloc"},
969 {Opt_nodelalloc
, "nodelalloc"},
973 static ext4_fsblk_t
get_sb_block(void **data
)
975 ext4_fsblk_t sb_block
;
976 char *options
= (char *) *data
;
978 if (!options
|| strncmp(options
, "sb=", 3) != 0)
979 return 1; /* Default location */
981 /*todo: use simple_strtoll with >32bit ext4 */
982 sb_block
= simple_strtoul(options
, &options
, 0);
983 if (*options
&& *options
!= ',') {
984 printk("EXT4-fs: Invalid sb specification: %s\n",
990 *data
= (void *) options
;
994 static int parse_options (char *options
, struct super_block
*sb
,
995 unsigned int *inum
, unsigned long *journal_devnum
,
996 ext4_fsblk_t
*n_blocks_count
, int is_remount
)
998 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1000 substring_t args
[MAX_OPT_ARGS
];
1007 ext4_fsblk_t last_block
;
1012 while ((p
= strsep (&options
, ",")) != NULL
) {
1017 token
= match_token(p
, tokens
, args
);
1020 clear_opt (sbi
->s_mount_opt
, MINIX_DF
);
1023 set_opt (sbi
->s_mount_opt
, MINIX_DF
);
1026 set_opt (sbi
->s_mount_opt
, GRPID
);
1029 clear_opt (sbi
->s_mount_opt
, GRPID
);
1032 if (match_int(&args
[0], &option
))
1034 sbi
->s_resuid
= option
;
1037 if (match_int(&args
[0], &option
))
1039 sbi
->s_resgid
= option
;
1042 /* handled by get_sb_block() instead of here */
1043 /* *sb_block = match_int(&args[0]); */
1046 clear_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
1047 clear_opt (sbi
->s_mount_opt
, ERRORS_RO
);
1048 set_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
1051 clear_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
1052 clear_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
1053 set_opt (sbi
->s_mount_opt
, ERRORS_RO
);
1056 clear_opt (sbi
->s_mount_opt
, ERRORS_RO
);
1057 clear_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
1058 set_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
1061 set_opt (sbi
->s_mount_opt
, NO_UID32
);
1064 clear_opt (sbi
->s_mount_opt
, CHECK
);
1067 set_opt (sbi
->s_mount_opt
, DEBUG
);
1070 set_opt (sbi
->s_mount_opt
, OLDALLOC
);
1073 clear_opt (sbi
->s_mount_opt
, OLDALLOC
);
1075 #ifdef CONFIG_EXT4DEV_FS_XATTR
1076 case Opt_user_xattr
:
1077 set_opt (sbi
->s_mount_opt
, XATTR_USER
);
1079 case Opt_nouser_xattr
:
1080 clear_opt (sbi
->s_mount_opt
, XATTR_USER
);
1083 case Opt_user_xattr
:
1084 case Opt_nouser_xattr
:
1085 printk("EXT4 (no)user_xattr options not supported\n");
1088 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1090 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1093 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1098 printk("EXT4 (no)acl options not supported\n");
1101 case Opt_reservation
:
1102 set_opt(sbi
->s_mount_opt
, RESERVATION
);
1104 case Opt_noreservation
:
1105 clear_opt(sbi
->s_mount_opt
, RESERVATION
);
1107 case Opt_journal_update
:
1109 /* Eventually we will want to be able to create
1110 a journal file here. For now, only allow the
1111 user to specify an existing inode to be the
1114 printk(KERN_ERR
"EXT4-fs: cannot specify "
1115 "journal on remount\n");
1118 set_opt (sbi
->s_mount_opt
, UPDATE_JOURNAL
);
1120 case Opt_journal_inum
:
1122 printk(KERN_ERR
"EXT4-fs: cannot specify "
1123 "journal on remount\n");
1126 if (match_int(&args
[0], &option
))
1130 case Opt_journal_dev
:
1132 printk(KERN_ERR
"EXT4-fs: cannot specify "
1133 "journal on remount\n");
1136 if (match_int(&args
[0], &option
))
1138 *journal_devnum
= option
;
1140 case Opt_journal_checksum
:
1141 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1143 case Opt_journal_async_commit
:
1144 set_opt(sbi
->s_mount_opt
, JOURNAL_ASYNC_COMMIT
);
1145 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1148 set_opt (sbi
->s_mount_opt
, NOLOAD
);
1151 if (match_int(&args
[0], &option
))
1156 option
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1157 sbi
->s_commit_interval
= HZ
* option
;
1159 case Opt_data_journal
:
1160 data_opt
= EXT4_MOUNT_JOURNAL_DATA
;
1162 case Opt_data_ordered
:
1163 data_opt
= EXT4_MOUNT_ORDERED_DATA
;
1165 case Opt_data_writeback
:
1166 data_opt
= EXT4_MOUNT_WRITEBACK_DATA
;
1169 if ((sbi
->s_mount_opt
& EXT4_MOUNT_DATA_FLAGS
)
1172 "EXT4-fs: cannot change data "
1173 "mode on remount\n");
1177 sbi
->s_mount_opt
&= ~EXT4_MOUNT_DATA_FLAGS
;
1178 sbi
->s_mount_opt
|= data_opt
;
1188 if ((sb_any_quota_enabled(sb
) ||
1189 sb_any_quota_suspended(sb
)) &&
1190 !sbi
->s_qf_names
[qtype
]) {
1192 "EXT4-fs: Cannot change journaled "
1193 "quota options when quota turned on.\n");
1196 qname
= match_strdup(&args
[0]);
1199 "EXT4-fs: not enough memory for "
1200 "storing quotafile name.\n");
1203 if (sbi
->s_qf_names
[qtype
] &&
1204 strcmp(sbi
->s_qf_names
[qtype
], qname
)) {
1206 "EXT4-fs: %s quota file already "
1207 "specified.\n", QTYPE2NAME(qtype
));
1211 sbi
->s_qf_names
[qtype
] = qname
;
1212 if (strchr(sbi
->s_qf_names
[qtype
], '/')) {
1214 "EXT4-fs: quotafile must be on "
1215 "filesystem root.\n");
1216 kfree(sbi
->s_qf_names
[qtype
]);
1217 sbi
->s_qf_names
[qtype
] = NULL
;
1220 set_opt(sbi
->s_mount_opt
, QUOTA
);
1222 case Opt_offusrjquota
:
1225 case Opt_offgrpjquota
:
1228 if ((sb_any_quota_enabled(sb
) ||
1229 sb_any_quota_suspended(sb
)) &&
1230 sbi
->s_qf_names
[qtype
]) {
1231 printk(KERN_ERR
"EXT4-fs: Cannot change "
1232 "journaled quota options when "
1233 "quota turned on.\n");
1237 * The space will be released later when all options
1238 * are confirmed to be correct
1240 sbi
->s_qf_names
[qtype
] = NULL
;
1242 case Opt_jqfmt_vfsold
:
1243 qfmt
= QFMT_VFS_OLD
;
1245 case Opt_jqfmt_vfsv0
:
1248 if ((sb_any_quota_enabled(sb
) ||
1249 sb_any_quota_suspended(sb
)) &&
1250 sbi
->s_jquota_fmt
!= qfmt
) {
1251 printk(KERN_ERR
"EXT4-fs: Cannot change "
1252 "journaled quota options when "
1253 "quota turned on.\n");
1256 sbi
->s_jquota_fmt
= qfmt
;
1260 set_opt(sbi
->s_mount_opt
, QUOTA
);
1261 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
1264 set_opt(sbi
->s_mount_opt
, QUOTA
);
1265 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1268 if (sb_any_quota_enabled(sb
)) {
1269 printk(KERN_ERR
"EXT4-fs: Cannot change quota "
1270 "options when quota turned on.\n");
1273 clear_opt(sbi
->s_mount_opt
, QUOTA
);
1274 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1275 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1282 "EXT4-fs: quota options not supported.\n");
1286 case Opt_offusrjquota
:
1287 case Opt_offgrpjquota
:
1288 case Opt_jqfmt_vfsold
:
1289 case Opt_jqfmt_vfsv0
:
1291 "EXT4-fs: journaled quota options not "
1298 set_opt(sbi
->s_mount_opt
, ABORT
);
1301 if (match_int(&args
[0], &option
))
1304 set_opt(sbi
->s_mount_opt
, BARRIER
);
1306 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1312 printk("EXT4-fs: resize option only available "
1316 if (match_int(&args
[0], &option
) != 0)
1318 *n_blocks_count
= option
;
1321 set_opt(sbi
->s_mount_opt
, NOBH
);
1324 clear_opt(sbi
->s_mount_opt
, NOBH
);
1327 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
,
1328 EXT4_FEATURE_INCOMPAT_EXTENTS
)) {
1329 ext4_warning(sb
, __func__
,
1330 "extents feature not enabled "
1331 "on this filesystem, use tune2fs\n");
1334 set_opt (sbi
->s_mount_opt
, EXTENTS
);
1338 * When e2fsprogs support resizing an already existing
1339 * ext3 file system to greater than 2**32 we need to
1340 * add support to block allocator to handle growing
1341 * already existing block mapped inode so that blocks
1342 * allocated for them fall within 2**32
1344 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
1345 if (last_block
> 0xffffffffULL
) {
1346 printk(KERN_ERR
"EXT4-fs: Filesystem too "
1347 "large to mount with "
1348 "-o noextents options\n");
1351 clear_opt (sbi
->s_mount_opt
, EXTENTS
);
1354 set_opt(sbi
->s_mount_opt
, I_VERSION
);
1355 sb
->s_flags
|= MS_I_VERSION
;
1357 case Opt_nodelalloc
:
1358 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
1361 set_opt(sbi
->s_mount_opt
, MBALLOC
);
1364 clear_opt(sbi
->s_mount_opt
, MBALLOC
);
1367 if (match_int(&args
[0], &option
))
1371 sbi
->s_stripe
= option
;
1374 set_opt(sbi
->s_mount_opt
, DELALLOC
);
1378 "EXT4-fs: Unrecognized mount option \"%s\" "
1379 "or missing value\n", p
);
1384 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1385 if ((sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
) &&
1386 sbi
->s_qf_names
[USRQUOTA
])
1387 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1389 if ((sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
) &&
1390 sbi
->s_qf_names
[GRPQUOTA
])
1391 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1393 if ((sbi
->s_qf_names
[USRQUOTA
] &&
1394 (sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
)) ||
1395 (sbi
->s_qf_names
[GRPQUOTA
] &&
1396 (sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
))) {
1397 printk(KERN_ERR
"EXT4-fs: old and new quota "
1398 "format mixing.\n");
1402 if (!sbi
->s_jquota_fmt
) {
1403 printk(KERN_ERR
"EXT4-fs: journaled quota format "
1404 "not specified.\n");
1408 if (sbi
->s_jquota_fmt
) {
1409 printk(KERN_ERR
"EXT4-fs: journaled quota format "
1410 "specified with no journaling "
1419 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1422 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1425 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1426 printk (KERN_ERR
"EXT4-fs warning: revision level too high, "
1427 "forcing read-only mode\n");
1432 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1433 printk (KERN_WARNING
"EXT4-fs warning: mounting unchecked fs, "
1434 "running e2fsck is recommended\n");
1435 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1436 printk (KERN_WARNING
1437 "EXT4-fs warning: mounting fs with errors, "
1438 "running e2fsck is recommended\n");
1439 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
1440 le16_to_cpu(es
->s_mnt_count
) >=
1441 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1442 printk (KERN_WARNING
1443 "EXT4-fs warning: maximal mount count reached, "
1444 "running e2fsck is recommended\n");
1445 else if (le32_to_cpu(es
->s_checkinterval
) &&
1446 (le32_to_cpu(es
->s_lastcheck
) +
1447 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1448 printk (KERN_WARNING
1449 "EXT4-fs warning: checktime reached, "
1450 "running e2fsck is recommended\n");
1452 /* @@@ We _will_ want to clear the valid bit if we find
1453 * inconsistencies, to force a fsck at reboot. But for
1454 * a plain journaled filesystem we can keep it set as
1457 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1459 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1460 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1461 le16_add_cpu(&es
->s_mnt_count
, 1);
1462 es
->s_mtime
= cpu_to_le32(get_seconds());
1463 ext4_update_dynamic_rev(sb
);
1464 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1466 ext4_commit_super(sb
, es
, 1);
1467 if (test_opt(sb
, DEBUG
))
1468 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%lu, "
1469 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1471 sbi
->s_groups_count
,
1472 EXT4_BLOCKS_PER_GROUP(sb
),
1473 EXT4_INODES_PER_GROUP(sb
),
1476 printk(KERN_INFO
"EXT4 FS on %s, ", sb
->s_id
);
1477 if (EXT4_SB(sb
)->s_journal
->j_inode
== NULL
) {
1478 char b
[BDEVNAME_SIZE
];
1480 printk("external journal on %s\n",
1481 bdevname(EXT4_SB(sb
)->s_journal
->j_dev
, b
));
1483 printk("internal journal\n");
1488 static int ext4_fill_flex_info(struct super_block
*sb
)
1490 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1491 struct ext4_group_desc
*gdp
= NULL
;
1492 struct buffer_head
*bh
;
1493 ext4_group_t flex_group_count
;
1494 ext4_group_t flex_group
;
1495 int groups_per_flex
= 0;
1496 __u64 block_bitmap
= 0;
1499 if (!sbi
->s_es
->s_log_groups_per_flex
) {
1500 sbi
->s_log_groups_per_flex
= 0;
1504 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1505 groups_per_flex
= 1 << sbi
->s_log_groups_per_flex
;
1507 flex_group_count
= (sbi
->s_groups_count
+ groups_per_flex
- 1) /
1509 sbi
->s_flex_groups
= kmalloc(flex_group_count
*
1510 sizeof(struct flex_groups
), GFP_KERNEL
);
1511 if (sbi
->s_flex_groups
== NULL
) {
1512 printk(KERN_ERR
"EXT4-fs: not enough memory\n");
1515 memset(sbi
->s_flex_groups
, 0, flex_group_count
*
1516 sizeof(struct flex_groups
));
1518 gdp
= ext4_get_group_desc(sb
, 1, &bh
);
1519 block_bitmap
= ext4_block_bitmap(sb
, gdp
) - 1;
1521 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1522 gdp
= ext4_get_group_desc(sb
, i
, &bh
);
1524 flex_group
= ext4_flex_group(sbi
, i
);
1525 sbi
->s_flex_groups
[flex_group
].free_inodes
+=
1526 le16_to_cpu(gdp
->bg_free_inodes_count
);
1527 sbi
->s_flex_groups
[flex_group
].free_blocks
+=
1528 le16_to_cpu(gdp
->bg_free_blocks_count
);
1536 __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
1537 struct ext4_group_desc
*gdp
)
1541 if (sbi
->s_es
->s_feature_ro_compat
&
1542 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) {
1543 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
1544 __le32 le_group
= cpu_to_le32(block_group
);
1546 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
1547 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
1548 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
1549 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
1550 /* for checksum of struct ext4_group_desc do the rest...*/
1551 if ((sbi
->s_es
->s_feature_incompat
&
1552 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
1553 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
1554 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
1555 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
1559 return cpu_to_le16(crc
);
1562 int ext4_group_desc_csum_verify(struct ext4_sb_info
*sbi
, __u32 block_group
,
1563 struct ext4_group_desc
*gdp
)
1565 if ((sbi
->s_es
->s_feature_ro_compat
&
1566 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) &&
1567 (gdp
->bg_checksum
!= ext4_group_desc_csum(sbi
, block_group
, gdp
)))
1573 /* Called at mount-time, super-block is locked */
1574 static int ext4_check_descriptors(struct super_block
*sb
)
1576 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1577 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
1578 ext4_fsblk_t last_block
;
1579 ext4_fsblk_t block_bitmap
;
1580 ext4_fsblk_t inode_bitmap
;
1581 ext4_fsblk_t inode_table
;
1582 int flexbg_flag
= 0;
1585 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
1588 ext4_debug ("Checking group descriptors");
1590 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1591 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1593 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
1594 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
1596 last_block
= first_block
+
1597 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
1599 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
1600 if (block_bitmap
< first_block
|| block_bitmap
> last_block
)
1602 printk(KERN_ERR
"EXT4-fs: ext4_check_descriptors: "
1603 "Block bitmap for group %lu not in group "
1604 "(block %llu)!", i
, block_bitmap
);
1607 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
1608 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
)
1610 printk(KERN_ERR
"EXT4-fs: ext4_check_descriptors: "
1611 "Inode bitmap for group %lu not in group "
1612 "(block %llu)!", i
, inode_bitmap
);
1615 inode_table
= ext4_inode_table(sb
, gdp
);
1616 if (inode_table
< first_block
||
1617 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
)
1619 printk(KERN_ERR
"EXT4-fs: ext4_check_descriptors: "
1620 "Inode table for group %lu not in group "
1621 "(block %llu)!", i
, inode_table
);
1624 if (!ext4_group_desc_csum_verify(sbi
, i
, gdp
)) {
1625 printk(KERN_ERR
"EXT4-fs: ext4_check_descriptors: "
1626 "Checksum for group %lu failed (%u!=%u)\n",
1627 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
1628 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
1632 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
1635 ext4_free_blocks_count_set(sbi
->s_es
, ext4_count_free_blocks(sb
));
1636 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
1640 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1641 * the superblock) which were deleted from all directories, but held open by
1642 * a process at the time of a crash. We walk the list and try to delete these
1643 * inodes at recovery time (only with a read-write filesystem).
1645 * In order to keep the orphan inode chain consistent during traversal (in
1646 * case of crash during recovery), we link each inode into the superblock
1647 * orphan list_head and handle it the same way as an inode deletion during
1648 * normal operation (which journals the operations for us).
1650 * We only do an iget() and an iput() on each inode, which is very safe if we
1651 * accidentally point at an in-use or already deleted inode. The worst that
1652 * can happen in this case is that we get a "bit already cleared" message from
1653 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1654 * e2fsck was run on this filesystem, and it must have already done the orphan
1655 * inode cleanup for us, so we can safely abort without any further action.
1657 static void ext4_orphan_cleanup (struct super_block
* sb
,
1658 struct ext4_super_block
* es
)
1660 unsigned int s_flags
= sb
->s_flags
;
1661 int nr_orphans
= 0, nr_truncates
= 0;
1665 if (!es
->s_last_orphan
) {
1666 jbd_debug(4, "no orphan inodes to clean up\n");
1670 if (bdev_read_only(sb
->s_bdev
)) {
1671 printk(KERN_ERR
"EXT4-fs: write access "
1672 "unavailable, skipping orphan cleanup.\n");
1676 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
1677 if (es
->s_last_orphan
)
1678 jbd_debug(1, "Errors on filesystem, "
1679 "clearing orphan list.\n");
1680 es
->s_last_orphan
= 0;
1681 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1685 if (s_flags
& MS_RDONLY
) {
1686 printk(KERN_INFO
"EXT4-fs: %s: orphan cleanup on readonly fs\n",
1688 sb
->s_flags
&= ~MS_RDONLY
;
1691 /* Needed for iput() to work correctly and not trash data */
1692 sb
->s_flags
|= MS_ACTIVE
;
1693 /* Turn on quotas so that they are updated correctly */
1694 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1695 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
1696 int ret
= ext4_quota_on_mount(sb
, i
);
1699 "EXT4-fs: Cannot turn on journaled "
1700 "quota: error %d\n", ret
);
1705 while (es
->s_last_orphan
) {
1706 struct inode
*inode
;
1708 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
1709 if (IS_ERR(inode
)) {
1710 es
->s_last_orphan
= 0;
1714 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
1716 if (inode
->i_nlink
) {
1718 "%s: truncating inode %lu to %Ld bytes\n",
1719 __func__
, inode
->i_ino
, inode
->i_size
);
1720 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1721 inode
->i_ino
, inode
->i_size
);
1722 ext4_truncate(inode
);
1726 "%s: deleting unreferenced inode %lu\n",
1727 __func__
, inode
->i_ino
);
1728 jbd_debug(2, "deleting unreferenced inode %lu\n",
1732 iput(inode
); /* The delete magic happens here! */
1735 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1738 printk(KERN_INFO
"EXT4-fs: %s: %d orphan inode%s deleted\n",
1739 sb
->s_id
, PLURAL(nr_orphans
));
1741 printk(KERN_INFO
"EXT4-fs: %s: %d truncate%s cleaned up\n",
1742 sb
->s_id
, PLURAL(nr_truncates
));
1744 /* Turn quotas off */
1745 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1746 if (sb_dqopt(sb
)->files
[i
])
1747 vfs_quota_off(sb
, i
, 0);
1750 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
1753 * Maximal extent format file size.
1754 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1755 * extent format containers, within a sector_t, and within i_blocks
1756 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1757 * so that won't be a limiting factor.
1759 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1761 static loff_t
ext4_max_size(int blkbits
)
1764 loff_t upper_limit
= MAX_LFS_FILESIZE
;
1766 /* small i_blocks in vfs inode? */
1767 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
1769 * CONFIG_LSF is not enabled implies the inode
1770 * i_block represent total blocks in 512 bytes
1771 * 32 == size of vfs inode i_blocks * 8
1773 upper_limit
= (1LL << 32) - 1;
1775 /* total blocks in file system block size */
1776 upper_limit
>>= (blkbits
- 9);
1777 upper_limit
<<= blkbits
;
1780 /* 32-bit extent-start container, ee_block */
1785 /* Sanity check against vm- & vfs- imposed limits */
1786 if (res
> upper_limit
)
1793 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
1794 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1795 * We need to be 1 filesystem block less than the 2^48 sector limit.
1797 static loff_t
ext4_max_bitmap_size(int bits
)
1799 loff_t res
= EXT4_NDIR_BLOCKS
;
1802 /* This is calculated to be the largest file size for a
1803 * dense, bitmapped file such that the total number of
1804 * sectors in the file, including data and all indirect blocks,
1805 * does not exceed 2^48 -1
1806 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1807 * total number of 512 bytes blocks of the file
1810 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
1812 * CONFIG_LSF is not enabled implies the inode
1813 * i_block represent total blocks in 512 bytes
1814 * 32 == size of vfs inode i_blocks * 8
1816 upper_limit
= (1LL << 32) - 1;
1818 /* total blocks in file system block size */
1819 upper_limit
>>= (bits
- 9);
1823 * We use 48 bit ext4_inode i_blocks
1824 * With EXT4_HUGE_FILE_FL set the i_blocks
1825 * represent total number of blocks in
1826 * file system block size
1828 upper_limit
= (1LL << 48) - 1;
1832 /* indirect blocks */
1834 /* double indirect blocks */
1835 meta_blocks
+= 1 + (1LL << (bits
-2));
1836 /* tripple indirect blocks */
1837 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
1839 upper_limit
-= meta_blocks
;
1840 upper_limit
<<= bits
;
1842 res
+= 1LL << (bits
-2);
1843 res
+= 1LL << (2*(bits
-2));
1844 res
+= 1LL << (3*(bits
-2));
1846 if (res
> upper_limit
)
1849 if (res
> MAX_LFS_FILESIZE
)
1850 res
= MAX_LFS_FILESIZE
;
1855 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
1856 ext4_fsblk_t logical_sb_block
, int nr
)
1858 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1859 ext4_group_t bg
, first_meta_bg
;
1862 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
1864 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
1866 return logical_sb_block
+ nr
+ 1;
1867 bg
= sbi
->s_desc_per_block
* nr
;
1868 if (ext4_bg_has_super(sb
, bg
))
1870 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
1874 * ext4_get_stripe_size: Get the stripe size.
1875 * @sbi: In memory super block info
1877 * If we have specified it via mount option, then
1878 * use the mount option value. If the value specified at mount time is
1879 * greater than the blocks per group use the super block value.
1880 * If the super block value is greater than blocks per group return 0.
1881 * Allocator needs it be less than blocks per group.
1884 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
1886 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
1887 unsigned long stripe_width
=
1888 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
1890 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
1891 return sbi
->s_stripe
;
1893 if (stripe_width
<= sbi
->s_blocks_per_group
)
1894 return stripe_width
;
1896 if (stride
<= sbi
->s_blocks_per_group
)
1902 static int ext4_fill_super (struct super_block
*sb
, void *data
, int silent
)
1903 __releases(kernel_lock
)
1904 __acquires(kernel_lock
)
1907 struct buffer_head
* bh
;
1908 struct ext4_super_block
*es
= NULL
;
1909 struct ext4_sb_info
*sbi
;
1911 ext4_fsblk_t sb_block
= get_sb_block(&data
);
1912 ext4_fsblk_t logical_sb_block
;
1913 unsigned long offset
= 0;
1914 unsigned int journal_inum
= 0;
1915 unsigned long journal_devnum
= 0;
1916 unsigned long def_mount_opts
;
1927 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
1930 sb
->s_fs_info
= sbi
;
1931 sbi
->s_mount_opt
= 0;
1932 sbi
->s_resuid
= EXT4_DEF_RESUID
;
1933 sbi
->s_resgid
= EXT4_DEF_RESGID
;
1934 sbi
->s_sb_block
= sb_block
;
1938 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
1940 printk(KERN_ERR
"EXT4-fs: unable to set blocksize\n");
1945 * The ext4 superblock will not be buffer aligned for other than 1kB
1946 * block sizes. We need to calculate the offset from buffer start.
1948 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
1949 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
1950 offset
= do_div(logical_sb_block
, blocksize
);
1952 logical_sb_block
= sb_block
;
1955 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
1956 printk (KERN_ERR
"EXT4-fs: unable to read superblock\n");
1960 * Note: s_es must be initialized as soon as possible because
1961 * some ext4 macro-instructions depend on its value
1963 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
1965 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
1966 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
1969 /* Set defaults before we parse the mount options */
1970 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
1971 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
1972 set_opt(sbi
->s_mount_opt
, DEBUG
);
1973 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
1974 set_opt(sbi
->s_mount_opt
, GRPID
);
1975 if (def_mount_opts
& EXT4_DEFM_UID16
)
1976 set_opt(sbi
->s_mount_opt
, NO_UID32
);
1977 #ifdef CONFIG_EXT4DEV_FS_XATTR
1978 if (def_mount_opts
& EXT4_DEFM_XATTR_USER
)
1979 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
1981 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1982 if (def_mount_opts
& EXT4_DEFM_ACL
)
1983 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1985 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
1986 sbi
->s_mount_opt
|= EXT4_MOUNT_JOURNAL_DATA
;
1987 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
1988 sbi
->s_mount_opt
|= EXT4_MOUNT_ORDERED_DATA
;
1989 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
1990 sbi
->s_mount_opt
|= EXT4_MOUNT_WRITEBACK_DATA
;
1992 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
1993 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1994 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
1995 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1997 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1999 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
2000 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
2002 set_opt(sbi
->s_mount_opt
, RESERVATION
);
2003 set_opt(sbi
->s_mount_opt
, BARRIER
);
2006 * turn on extents feature by default in ext4 filesystem
2007 * only if feature flag already set by mkfs or tune2fs.
2008 * Use -o noextents to turn it off
2010 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_EXTENTS
))
2011 set_opt(sbi
->s_mount_opt
, EXTENTS
);
2013 ext4_warning(sb
, __func__
,
2014 "extents feature not enabled on this filesystem, "
2017 * turn on mballoc code by default in ext4 filesystem
2018 * Use -o nomballoc to turn it off
2020 set_opt(sbi
->s_mount_opt
, MBALLOC
);
2023 * enable delayed allocation by default
2024 * Use -o nodelalloc to turn it off
2026 set_opt(sbi
->s_mount_opt
, DELALLOC
);
2029 if (!parse_options ((char *) data
, sb
, &journal_inum
, &journal_devnum
,
2033 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
2034 ((sbi
->s_mount_opt
& EXT4_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
2036 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
2037 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
2038 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
2039 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
2041 "EXT4-fs warning: feature flags set on rev 0 fs, "
2042 "running e2fsck is recommended\n");
2045 * Since ext4 is still considered development code, we require
2046 * that the TEST_FILESYS flag in s->flags be set.
2048 if (!(le32_to_cpu(es
->s_flags
) & EXT2_FLAGS_TEST_FILESYS
)) {
2049 printk(KERN_WARNING
"EXT4-fs: %s: not marked "
2050 "OK to use with test code.\n", sb
->s_id
);
2055 * Check feature flags regardless of the revision level, since we
2056 * previously didn't change the revision level when setting the flags,
2057 * so there is a chance incompat flags are set on a rev 0 filesystem.
2059 features
= EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
);
2061 printk(KERN_ERR
"EXT4-fs: %s: couldn't mount because of "
2062 "unsupported optional features (%x).\n",
2063 sb
->s_id
, le32_to_cpu(features
));
2066 features
= EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
);
2067 if (!(sb
->s_flags
& MS_RDONLY
) && features
) {
2068 printk(KERN_ERR
"EXT4-fs: %s: couldn't mount RDWR because of "
2069 "unsupported optional features (%x).\n",
2070 sb
->s_id
, le32_to_cpu(features
));
2073 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
2075 * Large file size enabled file system can only be
2076 * mount if kernel is build with CONFIG_LSF
2078 if (sizeof(root
->i_blocks
) < sizeof(u64
) &&
2079 !(sb
->s_flags
& MS_RDONLY
)) {
2080 printk(KERN_ERR
"EXT4-fs: %s: Filesystem with huge "
2081 "files cannot be mounted read-write "
2082 "without CONFIG_LSF.\n", sb
->s_id
);
2086 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
2088 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
2089 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
2091 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
2092 blocksize
, sb
->s_id
);
2096 if (sb
->s_blocksize
!= blocksize
) {
2098 /* Validate the filesystem blocksize */
2099 if (!sb_set_blocksize(sb
, blocksize
)) {
2100 printk(KERN_ERR
"EXT4-fs: bad block size %d.\n",
2106 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2107 offset
= do_div(logical_sb_block
, blocksize
);
2108 bh
= sb_bread(sb
, logical_sb_block
);
2111 "EXT4-fs: Can't read superblock on 2nd try.\n");
2114 es
= (struct ext4_super_block
*)(((char *)bh
->b_data
) + offset
);
2116 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
2118 "EXT4-fs: Magic mismatch, very weird !\n");
2123 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
);
2124 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
);
2126 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
2127 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
2128 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
2130 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
2131 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
2132 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
2133 (!is_power_of_2(sbi
->s_inode_size
)) ||
2134 (sbi
->s_inode_size
> blocksize
)) {
2136 "EXT4-fs: unsupported inode size: %d\n",
2140 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
2141 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
2143 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
2144 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
2145 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
2146 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
2147 !is_power_of_2(sbi
->s_desc_size
)) {
2149 "EXT4-fs: unsupported descriptor size %lu\n",
2154 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
2155 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
2156 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
2157 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
2159 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
2160 if (sbi
->s_inodes_per_block
== 0)
2162 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
2163 sbi
->s_inodes_per_block
;
2164 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
2166 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
2167 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
2168 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
2169 for (i
=0; i
< 4; i
++)
2170 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
2171 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
2173 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
2175 "EXT4-fs: #blocks per group too big: %lu\n",
2176 sbi
->s_blocks_per_group
);
2179 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
2181 "EXT4-fs: #inodes per group too big: %lu\n",
2182 sbi
->s_inodes_per_group
);
2186 if (ext4_blocks_count(es
) >
2187 (sector_t
)(~0ULL) >> (sb
->s_blocksize_bits
- 9)) {
2188 printk(KERN_ERR
"EXT4-fs: filesystem on %s:"
2189 " too large to mount safely\n", sb
->s_id
);
2190 if (sizeof(sector_t
) < 8)
2191 printk(KERN_WARNING
"EXT4-fs: CONFIG_LBD not "
2196 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
2199 /* ensure blocks_count calculation below doesn't sign-extend */
2200 if (ext4_blocks_count(es
) + EXT4_BLOCKS_PER_GROUP(sb
) <
2201 le32_to_cpu(es
->s_first_data_block
) + 1) {
2202 printk(KERN_WARNING
"EXT4-fs: bad geometry: block count %llu, "
2203 "first data block %u, blocks per group %lu\n",
2204 ext4_blocks_count(es
),
2205 le32_to_cpu(es
->s_first_data_block
),
2206 EXT4_BLOCKS_PER_GROUP(sb
));
2209 blocks_count
= (ext4_blocks_count(es
) -
2210 le32_to_cpu(es
->s_first_data_block
) +
2211 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2212 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
2213 sbi
->s_groups_count
= blocks_count
;
2214 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
2215 EXT4_DESC_PER_BLOCK(sb
);
2216 sbi
->s_group_desc
= kmalloc(db_count
* sizeof (struct buffer_head
*),
2218 if (sbi
->s_group_desc
== NULL
) {
2219 printk (KERN_ERR
"EXT4-fs: not enough memory\n");
2223 bgl_lock_init(&sbi
->s_blockgroup_lock
);
2225 for (i
= 0; i
< db_count
; i
++) {
2226 block
= descriptor_loc(sb
, logical_sb_block
, i
);
2227 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
2228 if (!sbi
->s_group_desc
[i
]) {
2229 printk (KERN_ERR
"EXT4-fs: "
2230 "can't read group descriptor %d\n", i
);
2235 if (!ext4_check_descriptors (sb
)) {
2236 printk(KERN_ERR
"EXT4-fs: group descriptors corrupted!\n");
2239 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
2240 if (!ext4_fill_flex_info(sb
)) {
2242 "EXT4-fs: unable to initialize "
2243 "flex_bg meta info!\n");
2247 sbi
->s_gdb_count
= db_count
;
2248 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
2249 spin_lock_init(&sbi
->s_next_gen_lock
);
2251 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
2252 ext4_count_free_blocks(sb
));
2254 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
2255 ext4_count_free_inodes(sb
));
2258 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
2259 ext4_count_dirs(sb
));
2262 printk(KERN_ERR
"EXT4-fs: insufficient memory\n");
2266 /* per fileystem reservation list head & lock */
2267 spin_lock_init(&sbi
->s_rsv_window_lock
);
2268 sbi
->s_rsv_window_root
= RB_ROOT
;
2269 /* Add a single, static dummy reservation to the start of the
2270 * reservation window list --- it gives us a placeholder for
2271 * append-at-start-of-list which makes the allocation logic
2272 * _much_ simpler. */
2273 sbi
->s_rsv_window_head
.rsv_start
= EXT4_RESERVE_WINDOW_NOT_ALLOCATED
;
2274 sbi
->s_rsv_window_head
.rsv_end
= EXT4_RESERVE_WINDOW_NOT_ALLOCATED
;
2275 sbi
->s_rsv_window_head
.rsv_alloc_hit
= 0;
2276 sbi
->s_rsv_window_head
.rsv_goal_size
= 0;
2277 ext4_rsv_window_add(sb
, &sbi
->s_rsv_window_head
);
2279 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
2282 * set up enough so that it can read an inode
2284 sb
->s_op
= &ext4_sops
;
2285 sb
->s_export_op
= &ext4_export_ops
;
2286 sb
->s_xattr
= ext4_xattr_handlers
;
2288 sb
->s_qcop
= &ext4_qctl_operations
;
2289 sb
->dq_op
= &ext4_quota_operations
;
2291 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
2295 needs_recovery
= (es
->s_last_orphan
!= 0 ||
2296 EXT4_HAS_INCOMPAT_FEATURE(sb
,
2297 EXT4_FEATURE_INCOMPAT_RECOVER
));
2300 * The first inode we look at is the journal inode. Don't try
2301 * root first: it may be modified in the journal!
2303 if (!test_opt(sb
, NOLOAD
) &&
2304 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
2305 if (ext4_load_journal(sb
, es
, journal_devnum
))
2307 if (!(sb
->s_flags
& MS_RDONLY
) &&
2308 EXT4_SB(sb
)->s_journal
->j_failed_commit
) {
2309 printk(KERN_CRIT
"EXT4-fs error (device %s): "
2310 "ext4_fill_super: Journal transaction "
2311 "%u is corrupt\n", sb
->s_id
,
2312 EXT4_SB(sb
)->s_journal
->j_failed_commit
);
2313 if (test_opt (sb
, ERRORS_RO
)) {
2315 "Mounting filesystem read-only\n");
2316 sb
->s_flags
|= MS_RDONLY
;
2317 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
2318 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
2320 if (test_opt(sb
, ERRORS_PANIC
)) {
2321 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
2322 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
2323 ext4_commit_super(sb
, es
, 1);
2325 "EXT4-fs (device %s): mount failed\n",
2330 } else if (journal_inum
) {
2331 if (ext4_create_journal(sb
, es
, journal_inum
))
2336 "ext4: No journal on filesystem on %s\n",
2341 if (ext4_blocks_count(es
) > 0xffffffffULL
&&
2342 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
2343 JBD2_FEATURE_INCOMPAT_64BIT
)) {
2344 printk(KERN_ERR
"ext4: Failed to set 64-bit journal feature\n");
2348 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
2349 jbd2_journal_set_features(sbi
->s_journal
,
2350 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2351 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2352 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
2353 jbd2_journal_set_features(sbi
->s_journal
,
2354 JBD2_FEATURE_COMPAT_CHECKSUM
, 0, 0);
2355 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
2356 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2358 jbd2_journal_clear_features(sbi
->s_journal
,
2359 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2360 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2363 /* We have now updated the journal if required, so we can
2364 * validate the data journaling mode. */
2365 switch (test_opt(sb
, DATA_FLAGS
)) {
2367 /* No mode set, assume a default based on the journal
2368 * capabilities: ORDERED_DATA if the journal can
2369 * cope, else JOURNAL_DATA
2371 if (jbd2_journal_check_available_features
2372 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
2373 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
2375 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
2378 case EXT4_MOUNT_ORDERED_DATA
:
2379 case EXT4_MOUNT_WRITEBACK_DATA
:
2380 if (!jbd2_journal_check_available_features
2381 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
2382 printk(KERN_ERR
"EXT4-fs: Journal does not support "
2383 "requested data journaling mode\n");
2390 if (test_opt(sb
, NOBH
)) {
2391 if (!(test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)) {
2392 printk(KERN_WARNING
"EXT4-fs: Ignoring nobh option - "
2393 "its supported only with writeback mode\n");
2394 clear_opt(sbi
->s_mount_opt
, NOBH
);
2398 * The jbd2_journal_load will have done any necessary log recovery,
2399 * so we can safely mount the rest of the filesystem now.
2402 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
2404 printk(KERN_ERR
"EXT4-fs: get root inode failed\n");
2405 ret
= PTR_ERR(root
);
2408 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
2410 printk(KERN_ERR
"EXT4-fs: corrupt root inode, run e2fsck\n");
2413 sb
->s_root
= d_alloc_root(root
);
2415 printk(KERN_ERR
"EXT4-fs: get root dentry failed\n");
2421 ext4_setup_super (sb
, es
, sb
->s_flags
& MS_RDONLY
);
2423 /* determine the minimum size of new large inodes, if present */
2424 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
2425 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2426 EXT4_GOOD_OLD_INODE_SIZE
;
2427 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2428 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
2429 if (sbi
->s_want_extra_isize
<
2430 le16_to_cpu(es
->s_want_extra_isize
))
2431 sbi
->s_want_extra_isize
=
2432 le16_to_cpu(es
->s_want_extra_isize
);
2433 if (sbi
->s_want_extra_isize
<
2434 le16_to_cpu(es
->s_min_extra_isize
))
2435 sbi
->s_want_extra_isize
=
2436 le16_to_cpu(es
->s_min_extra_isize
);
2439 /* Check if enough inode space is available */
2440 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
2441 sbi
->s_inode_size
) {
2442 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2443 EXT4_GOOD_OLD_INODE_SIZE
;
2444 printk(KERN_INFO
"EXT4-fs: required extra inode space not"
2449 * akpm: core read_super() calls in here with the superblock locked.
2450 * That deadlocks, because orphan cleanup needs to lock the superblock
2451 * in numerous places. Here we just pop the lock - it's relatively
2452 * harmless, because we are now ready to accept write_super() requests,
2453 * and aviro says that's the only reason for hanging onto the
2456 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
2457 ext4_orphan_cleanup(sb
, es
);
2458 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
2460 printk (KERN_INFO
"EXT4-fs: recovery complete.\n");
2461 ext4_mark_recovery_complete(sb
, es
);
2462 printk (KERN_INFO
"EXT4-fs: mounted filesystem with %s data mode.\n",
2463 test_opt(sb
,DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
? "journal":
2464 test_opt(sb
,DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
? "ordered":
2467 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
2468 printk(KERN_WARNING
"EXT4-fs: Ignoring delalloc option - "
2469 "requested data journaling mode\n");
2470 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
2471 } else if (test_opt(sb
, DELALLOC
))
2472 printk(KERN_INFO
"EXT4-fs: delayed allocation enabled\n");
2475 ext4_mb_init(sb
, needs_recovery
);
2482 printk(KERN_ERR
"VFS: Can't find ext4 filesystem on dev %s.\n",
2487 jbd2_journal_destroy(sbi
->s_journal
);
2488 sbi
->s_journal
= NULL
;
2490 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
2491 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
2492 percpu_counter_destroy(&sbi
->s_dirs_counter
);
2494 for (i
= 0; i
< db_count
; i
++)
2495 brelse(sbi
->s_group_desc
[i
]);
2496 kfree(sbi
->s_group_desc
);
2499 for (i
= 0; i
< MAXQUOTAS
; i
++)
2500 kfree(sbi
->s_qf_names
[i
]);
2502 ext4_blkdev_remove(sbi
);
2505 sb
->s_fs_info
= NULL
;
2512 * Setup any per-fs journal parameters now. We'll do this both on
2513 * initial mount, once the journal has been initialised but before we've
2514 * done any recovery; and again on any subsequent remount.
2516 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
2518 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2520 if (sbi
->s_commit_interval
)
2521 journal
->j_commit_interval
= sbi
->s_commit_interval
;
2522 /* We could also set up an ext4-specific default for the commit
2523 * interval here, but for now we'll just fall back to the jbd
2526 spin_lock(&journal
->j_state_lock
);
2527 if (test_opt(sb
, BARRIER
))
2528 journal
->j_flags
|= JBD2_BARRIER
;
2530 journal
->j_flags
&= ~JBD2_BARRIER
;
2531 spin_unlock(&journal
->j_state_lock
);
2534 static journal_t
*ext4_get_journal(struct super_block
*sb
,
2535 unsigned int journal_inum
)
2537 struct inode
*journal_inode
;
2540 /* First, test for the existence of a valid inode on disk. Bad
2541 * things happen if we iget() an unused inode, as the subsequent
2542 * iput() will try to delete it. */
2544 journal_inode
= ext4_iget(sb
, journal_inum
);
2545 if (IS_ERR(journal_inode
)) {
2546 printk(KERN_ERR
"EXT4-fs: no journal found.\n");
2549 if (!journal_inode
->i_nlink
) {
2550 make_bad_inode(journal_inode
);
2551 iput(journal_inode
);
2552 printk(KERN_ERR
"EXT4-fs: journal inode is deleted.\n");
2556 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2557 journal_inode
, journal_inode
->i_size
);
2558 if (!S_ISREG(journal_inode
->i_mode
)) {
2559 printk(KERN_ERR
"EXT4-fs: invalid journal inode.\n");
2560 iput(journal_inode
);
2564 journal
= jbd2_journal_init_inode(journal_inode
);
2566 printk(KERN_ERR
"EXT4-fs: Could not load journal inode\n");
2567 iput(journal_inode
);
2570 journal
->j_private
= sb
;
2571 ext4_init_journal_params(sb
, journal
);
2575 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
2578 struct buffer_head
* bh
;
2582 int hblock
, blocksize
;
2583 ext4_fsblk_t sb_block
;
2584 unsigned long offset
;
2585 struct ext4_super_block
* es
;
2586 struct block_device
*bdev
;
2588 bdev
= ext4_blkdev_get(j_dev
);
2592 if (bd_claim(bdev
, sb
)) {
2594 "EXT4: failed to claim external journal device.\n");
2599 blocksize
= sb
->s_blocksize
;
2600 hblock
= bdev_hardsect_size(bdev
);
2601 if (blocksize
< hblock
) {
2603 "EXT4-fs: blocksize too small for journal device.\n");
2607 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
2608 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
2609 set_blocksize(bdev
, blocksize
);
2610 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
2611 printk(KERN_ERR
"EXT4-fs: couldn't read superblock of "
2612 "external journal\n");
2616 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
2617 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
2618 !(le32_to_cpu(es
->s_feature_incompat
) &
2619 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
2620 printk(KERN_ERR
"EXT4-fs: external journal has "
2621 "bad superblock\n");
2626 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
2627 printk(KERN_ERR
"EXT4-fs: journal UUID does not match\n");
2632 len
= ext4_blocks_count(es
);
2633 start
= sb_block
+ 1;
2634 brelse(bh
); /* we're done with the superblock */
2636 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
2637 start
, len
, blocksize
);
2639 printk(KERN_ERR
"EXT4-fs: failed to create device journal\n");
2642 journal
->j_private
= sb
;
2643 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
2644 wait_on_buffer(journal
->j_sb_buffer
);
2645 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
2646 printk(KERN_ERR
"EXT4-fs: I/O error on journal device\n");
2649 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
2650 printk(KERN_ERR
"EXT4-fs: External journal has more than one "
2651 "user (unsupported) - %d\n",
2652 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
2655 EXT4_SB(sb
)->journal_bdev
= bdev
;
2656 ext4_init_journal_params(sb
, journal
);
2659 jbd2_journal_destroy(journal
);
2661 ext4_blkdev_put(bdev
);
2665 static int ext4_load_journal(struct super_block
*sb
,
2666 struct ext4_super_block
*es
,
2667 unsigned long journal_devnum
)
2670 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
2673 int really_read_only
;
2675 if (journal_devnum
&&
2676 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
2677 printk(KERN_INFO
"EXT4-fs: external journal device major/minor "
2678 "numbers have changed\n");
2679 journal_dev
= new_decode_dev(journal_devnum
);
2681 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
2683 really_read_only
= bdev_read_only(sb
->s_bdev
);
2686 * Are we loading a blank journal or performing recovery after a
2687 * crash? For recovery, we need to check in advance whether we
2688 * can get read-write access to the device.
2691 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
2692 if (sb
->s_flags
& MS_RDONLY
) {
2693 printk(KERN_INFO
"EXT4-fs: INFO: recovery "
2694 "required on readonly filesystem.\n");
2695 if (really_read_only
) {
2696 printk(KERN_ERR
"EXT4-fs: write access "
2697 "unavailable, cannot proceed.\n");
2700 printk (KERN_INFO
"EXT4-fs: write access will "
2701 "be enabled during recovery.\n");
2705 if (journal_inum
&& journal_dev
) {
2706 printk(KERN_ERR
"EXT4-fs: filesystem has both journal "
2707 "and inode journals!\n");
2712 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
2715 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
2719 if (!really_read_only
&& test_opt(sb
, UPDATE_JOURNAL
)) {
2720 err
= jbd2_journal_update_format(journal
);
2722 printk(KERN_ERR
"EXT4-fs: error updating journal.\n");
2723 jbd2_journal_destroy(journal
);
2728 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
2729 err
= jbd2_journal_wipe(journal
, !really_read_only
);
2731 err
= jbd2_journal_load(journal
);
2734 printk(KERN_ERR
"EXT4-fs: error loading journal.\n");
2735 jbd2_journal_destroy(journal
);
2739 EXT4_SB(sb
)->s_journal
= journal
;
2740 ext4_clear_journal_err(sb
, es
);
2742 if (journal_devnum
&&
2743 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
2744 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
2747 /* Make sure we flush the recovery flag to disk. */
2748 ext4_commit_super(sb
, es
, 1);
2754 static int ext4_create_journal(struct super_block
* sb
,
2755 struct ext4_super_block
* es
,
2756 unsigned int journal_inum
)
2761 if (sb
->s_flags
& MS_RDONLY
) {
2762 printk(KERN_ERR
"EXT4-fs: readonly filesystem when trying to "
2763 "create journal.\n");
2767 journal
= ext4_get_journal(sb
, journal_inum
);
2771 printk(KERN_INFO
"EXT4-fs: creating new journal on inode %u\n",
2774 err
= jbd2_journal_create(journal
);
2776 printk(KERN_ERR
"EXT4-fs: error creating journal.\n");
2777 jbd2_journal_destroy(journal
);
2781 EXT4_SB(sb
)->s_journal
= journal
;
2783 ext4_update_dynamic_rev(sb
);
2784 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
2785 EXT4_SET_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
);
2787 es
->s_journal_inum
= cpu_to_le32(journal_inum
);
2790 /* Make sure we flush the recovery flag to disk. */
2791 ext4_commit_super(sb
, es
, 1);
2796 static void ext4_commit_super (struct super_block
* sb
,
2797 struct ext4_super_block
* es
,
2800 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
2804 es
->s_wtime
= cpu_to_le32(get_seconds());
2805 ext4_free_blocks_count_set(es
, ext4_count_free_blocks(sb
));
2806 es
->s_free_inodes_count
= cpu_to_le32(ext4_count_free_inodes(sb
));
2807 BUFFER_TRACE(sbh
, "marking dirty");
2808 mark_buffer_dirty(sbh
);
2810 sync_dirty_buffer(sbh
);
2815 * Have we just finished recovery? If so, and if we are mounting (or
2816 * remounting) the filesystem readonly, then we will end up with a
2817 * consistent fs on disk. Record that fact.
2819 static void ext4_mark_recovery_complete(struct super_block
* sb
,
2820 struct ext4_super_block
* es
)
2822 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
2824 jbd2_journal_lock_updates(journal
);
2825 jbd2_journal_flush(journal
);
2827 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
2828 sb
->s_flags
& MS_RDONLY
) {
2829 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
2831 ext4_commit_super(sb
, es
, 1);
2834 jbd2_journal_unlock_updates(journal
);
2838 * If we are mounting (or read-write remounting) a filesystem whose journal
2839 * has recorded an error from a previous lifetime, move that error to the
2840 * main filesystem now.
2842 static void ext4_clear_journal_err(struct super_block
* sb
,
2843 struct ext4_super_block
* es
)
2849 journal
= EXT4_SB(sb
)->s_journal
;
2852 * Now check for any error status which may have been recorded in the
2853 * journal by a prior ext4_error() or ext4_abort()
2856 j_errno
= jbd2_journal_errno(journal
);
2860 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
2861 ext4_warning(sb
, __func__
, "Filesystem error recorded "
2862 "from previous mount: %s", errstr
);
2863 ext4_warning(sb
, __func__
, "Marking fs in need of "
2864 "filesystem check.");
2866 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
2867 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
2868 ext4_commit_super (sb
, es
, 1);
2870 jbd2_journal_clear_err(journal
);
2875 * Force the running and committing transactions to commit,
2876 * and wait on the commit.
2878 int ext4_force_commit(struct super_block
*sb
)
2883 if (sb
->s_flags
& MS_RDONLY
)
2886 journal
= EXT4_SB(sb
)->s_journal
;
2888 ret
= ext4_journal_force_commit(journal
);
2893 * Ext4 always journals updates to the superblock itself, so we don't
2894 * have to propagate any other updates to the superblock on disk at this
2895 * point. Just start an async writeback to get the buffers on their way
2898 * This implicitly triggers the writebehind on sync().
2901 static void ext4_write_super (struct super_block
* sb
)
2903 if (mutex_trylock(&sb
->s_lock
) != 0)
2908 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
2913 if (jbd2_journal_start_commit(EXT4_SB(sb
)->s_journal
, &target
)) {
2915 jbd2_log_wait_commit(EXT4_SB(sb
)->s_journal
, target
);
2921 * LVM calls this function before a (read-only) snapshot is created. This
2922 * gives us a chance to flush the journal completely and mark the fs clean.
2924 static void ext4_write_super_lockfs(struct super_block
*sb
)
2928 if (!(sb
->s_flags
& MS_RDONLY
)) {
2929 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
2931 /* Now we set up the journal barrier. */
2932 jbd2_journal_lock_updates(journal
);
2933 jbd2_journal_flush(journal
);
2935 /* Journal blocked and flushed, clear needs_recovery flag. */
2936 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
2937 ext4_commit_super(sb
, EXT4_SB(sb
)->s_es
, 1);
2942 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2943 * flag here, even though the filesystem is not technically dirty yet.
2945 static void ext4_unlockfs(struct super_block
*sb
)
2947 if (!(sb
->s_flags
& MS_RDONLY
)) {
2949 /* Reser the needs_recovery flag before the fs is unlocked. */
2950 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
2951 ext4_commit_super(sb
, EXT4_SB(sb
)->s_es
, 1);
2953 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
2957 static int ext4_remount (struct super_block
* sb
, int * flags
, char * data
)
2959 struct ext4_super_block
* es
;
2960 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2961 ext4_fsblk_t n_blocks_count
= 0;
2962 unsigned long old_sb_flags
;
2963 struct ext4_mount_options old_opts
;
2969 /* Store the original options */
2970 old_sb_flags
= sb
->s_flags
;
2971 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
2972 old_opts
.s_resuid
= sbi
->s_resuid
;
2973 old_opts
.s_resgid
= sbi
->s_resgid
;
2974 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
2976 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
2977 for (i
= 0; i
< MAXQUOTAS
; i
++)
2978 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
2982 * Allow the "check" option to be passed as a remount option.
2984 if (!parse_options(data
, sb
, NULL
, NULL
, &n_blocks_count
, 1)) {
2989 if (sbi
->s_mount_opt
& EXT4_MOUNT_ABORT
)
2990 ext4_abort(sb
, __func__
, "Abort forced by user");
2992 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
2993 ((sbi
->s_mount_opt
& EXT4_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
2997 ext4_init_journal_params(sb
, sbi
->s_journal
);
2999 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
) ||
3000 n_blocks_count
> ext4_blocks_count(es
)) {
3001 if (sbi
->s_mount_opt
& EXT4_MOUNT_ABORT
) {
3006 if (*flags
& MS_RDONLY
) {
3008 * First of all, the unconditional stuff we have to do
3009 * to disable replay of the journal when we next remount
3011 sb
->s_flags
|= MS_RDONLY
;
3014 * OK, test if we are remounting a valid rw partition
3015 * readonly, and if so set the rdonly flag and then
3016 * mark the partition as valid again.
3018 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
3019 (sbi
->s_mount_state
& EXT4_VALID_FS
))
3020 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
3023 * We have to unlock super so that we can wait for
3027 ext4_mark_recovery_complete(sb
, es
);
3031 if ((ret
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3032 ~EXT4_FEATURE_RO_COMPAT_SUPP
))) {
3033 printk(KERN_WARNING
"EXT4-fs: %s: couldn't "
3034 "remount RDWR because of unsupported "
3035 "optional features (%x).\n",
3036 sb
->s_id
, le32_to_cpu(ret
));
3042 * If we have an unprocessed orphan list hanging
3043 * around from a previously readonly bdev mount,
3044 * require a full umount/remount for now.
3046 if (es
->s_last_orphan
) {
3047 printk(KERN_WARNING
"EXT4-fs: %s: couldn't "
3048 "remount RDWR because of unprocessed "
3049 "orphan inode list. Please "
3050 "umount/remount instead.\n",
3057 * Mounting a RDONLY partition read-write, so reread
3058 * and store the current valid flag. (It may have
3059 * been changed by e2fsck since we originally mounted
3062 ext4_clear_journal_err(sb
, es
);
3063 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3064 if ((err
= ext4_group_extend(sb
, es
, n_blocks_count
)))
3066 if (!ext4_setup_super (sb
, es
, 0))
3067 sb
->s_flags
&= ~MS_RDONLY
;
3071 /* Release old quota file names */
3072 for (i
= 0; i
< MAXQUOTAS
; i
++)
3073 if (old_opts
.s_qf_names
[i
] &&
3074 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3075 kfree(old_opts
.s_qf_names
[i
]);
3079 sb
->s_flags
= old_sb_flags
;
3080 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
3081 sbi
->s_resuid
= old_opts
.s_resuid
;
3082 sbi
->s_resgid
= old_opts
.s_resgid
;
3083 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
3085 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
3086 for (i
= 0; i
< MAXQUOTAS
; i
++) {
3087 if (sbi
->s_qf_names
[i
] &&
3088 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3089 kfree(sbi
->s_qf_names
[i
]);
3090 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
3096 static int ext4_statfs (struct dentry
* dentry
, struct kstatfs
* buf
)
3098 struct super_block
*sb
= dentry
->d_sb
;
3099 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3100 struct ext4_super_block
*es
= sbi
->s_es
;
3103 if (test_opt(sb
, MINIX_DF
)) {
3104 sbi
->s_overhead_last
= 0;
3105 } else if (sbi
->s_blocks_last
!= ext4_blocks_count(es
)) {
3106 ext4_group_t ngroups
= sbi
->s_groups_count
, i
;
3107 ext4_fsblk_t overhead
= 0;
3111 * Compute the overhead (FS structures). This is constant
3112 * for a given filesystem unless the number of block groups
3113 * changes so we cache the previous value until it does.
3117 * All of the blocks before first_data_block are
3120 overhead
= le32_to_cpu(es
->s_first_data_block
);
3123 * Add the overhead attributed to the superblock and
3124 * block group descriptors. If the sparse superblocks
3125 * feature is turned on, then not all groups have this.
3127 for (i
= 0; i
< ngroups
; i
++) {
3128 overhead
+= ext4_bg_has_super(sb
, i
) +
3129 ext4_bg_num_gdb(sb
, i
);
3134 * Every block group has an inode bitmap, a block
3135 * bitmap, and an inode table.
3137 overhead
+= ngroups
* (2 + sbi
->s_itb_per_group
);
3138 sbi
->s_overhead_last
= overhead
;
3140 sbi
->s_blocks_last
= ext4_blocks_count(es
);
3143 buf
->f_type
= EXT4_SUPER_MAGIC
;
3144 buf
->f_bsize
= sb
->s_blocksize
;
3145 buf
->f_blocks
= ext4_blocks_count(es
) - sbi
->s_overhead_last
;
3146 buf
->f_bfree
= percpu_counter_sum_positive(&sbi
->s_freeblocks_counter
);
3147 ext4_free_blocks_count_set(es
, buf
->f_bfree
);
3148 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
3149 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
3151 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
3152 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
3153 es
->s_free_inodes_count
= cpu_to_le32(buf
->f_ffree
);
3154 buf
->f_namelen
= EXT4_NAME_LEN
;
3155 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
3156 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
3157 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
3158 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
3162 /* Helper function for writing quotas on sync - we need to start transaction before quota file
3163 * is locked for write. Otherwise the are possible deadlocks:
3164 * Process 1 Process 2
3165 * ext4_create() quota_sync()
3166 * jbd2_journal_start() write_dquot()
3167 * DQUOT_INIT() down(dqio_mutex)
3168 * down(dqio_mutex) jbd2_journal_start()
3174 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
3176 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_type
];
3179 static int ext4_dquot_initialize(struct inode
*inode
, int type
)
3184 /* We may create quota structure so we need to reserve enough blocks */
3185 handle
= ext4_journal_start(inode
, 2*EXT4_QUOTA_INIT_BLOCKS(inode
->i_sb
));
3187 return PTR_ERR(handle
);
3188 ret
= dquot_initialize(inode
, type
);
3189 err
= ext4_journal_stop(handle
);
3195 static int ext4_dquot_drop(struct inode
*inode
)
3200 /* We may delete quota structure so we need to reserve enough blocks */
3201 handle
= ext4_journal_start(inode
, 2*EXT4_QUOTA_DEL_BLOCKS(inode
->i_sb
));
3202 if (IS_ERR(handle
)) {
3204 * We call dquot_drop() anyway to at least release references
3205 * to quota structures so that umount does not hang.
3208 return PTR_ERR(handle
);
3210 ret
= dquot_drop(inode
);
3211 err
= ext4_journal_stop(handle
);
3217 static int ext4_write_dquot(struct dquot
*dquot
)
3221 struct inode
*inode
;
3223 inode
= dquot_to_inode(dquot
);
3224 handle
= ext4_journal_start(inode
,
3225 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
3227 return PTR_ERR(handle
);
3228 ret
= dquot_commit(dquot
);
3229 err
= ext4_journal_stop(handle
);
3235 static int ext4_acquire_dquot(struct dquot
*dquot
)
3240 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3241 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
3243 return PTR_ERR(handle
);
3244 ret
= dquot_acquire(dquot
);
3245 err
= ext4_journal_stop(handle
);
3251 static int ext4_release_dquot(struct dquot
*dquot
)
3256 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3257 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
3258 if (IS_ERR(handle
)) {
3259 /* Release dquot anyway to avoid endless cycle in dqput() */
3260 dquot_release(dquot
);
3261 return PTR_ERR(handle
);
3263 ret
= dquot_release(dquot
);
3264 err
= ext4_journal_stop(handle
);
3270 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
3272 /* Are we journaling quotas? */
3273 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
3274 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
3275 dquot_mark_dquot_dirty(dquot
);
3276 return ext4_write_dquot(dquot
);
3278 return dquot_mark_dquot_dirty(dquot
);
3282 static int ext4_write_info(struct super_block
*sb
, int type
)
3287 /* Data block + inode block */
3288 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
3290 return PTR_ERR(handle
);
3291 ret
= dquot_commit_info(sb
, type
);
3292 err
= ext4_journal_stop(handle
);
3299 * Turn on quotas during mount time - we need to find
3300 * the quota file and such...
3302 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
3304 return vfs_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
3305 EXT4_SB(sb
)->s_jquota_fmt
, type
);
3309 * Standard function to be called on quota_on
3311 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
3312 char *path
, int remount
)
3315 struct nameidata nd
;
3317 if (!test_opt(sb
, QUOTA
))
3319 /* When remounting, no checks are needed and in fact, path is NULL */
3321 return vfs_quota_on(sb
, type
, format_id
, path
, remount
);
3323 err
= path_lookup(path
, LOOKUP_FOLLOW
, &nd
);
3327 /* Quotafile not on the same filesystem? */
3328 if (nd
.path
.mnt
->mnt_sb
!= sb
) {
3332 /* Journaling quota? */
3333 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
3334 /* Quotafile not of fs root? */
3335 if (nd
.path
.dentry
->d_parent
->d_inode
!= sb
->s_root
->d_inode
)
3337 "EXT4-fs: Quota file not on filesystem root. "
3338 "Journaled quota will not work.\n");
3342 * When we journal data on quota file, we have to flush journal to see
3343 * all updates to the file when we bypass pagecache...
3345 if (ext4_should_journal_data(nd
.path
.dentry
->d_inode
)) {
3347 * We don't need to lock updates but journal_flush() could
3348 * otherwise be livelocked...
3350 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
3351 jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
3352 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
3356 return vfs_quota_on(sb
, type
, format_id
, path
, remount
);
3359 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3360 * acquiring the locks... As quota files are never truncated and quota code
3361 * itself serializes the operations (and noone else should touch the files)
3362 * we don't have to be afraid of races */
3363 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
3364 size_t len
, loff_t off
)
3366 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
3367 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
3369 int offset
= off
& (sb
->s_blocksize
- 1);
3372 struct buffer_head
*bh
;
3373 loff_t i_size
= i_size_read(inode
);
3377 if (off
+len
> i_size
)
3380 while (toread
> 0) {
3381 tocopy
= sb
->s_blocksize
- offset
< toread
?
3382 sb
->s_blocksize
- offset
: toread
;
3383 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
3386 if (!bh
) /* A hole? */
3387 memset(data
, 0, tocopy
);
3389 memcpy(data
, bh
->b_data
+offset
, tocopy
);
3399 /* Write to quotafile (we know the transaction is already started and has
3400 * enough credits) */
3401 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
3402 const char *data
, size_t len
, loff_t off
)
3404 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
3405 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
3407 int offset
= off
& (sb
->s_blocksize
- 1);
3409 int journal_quota
= EXT4_SB(sb
)->s_qf_names
[type
] != NULL
;
3410 size_t towrite
= len
;
3411 struct buffer_head
*bh
;
3412 handle_t
*handle
= journal_current_handle();
3415 printk(KERN_WARNING
"EXT4-fs: Quota write (off=%Lu, len=%Lu)"
3416 " cancelled because transaction is not started.\n",
3417 (unsigned long long)off
, (unsigned long long)len
);
3420 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
3421 while (towrite
> 0) {
3422 tocopy
= sb
->s_blocksize
- offset
< towrite
?
3423 sb
->s_blocksize
- offset
: towrite
;
3424 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
3427 if (journal_quota
) {
3428 err
= ext4_journal_get_write_access(handle
, bh
);
3435 memcpy(bh
->b_data
+offset
, data
, tocopy
);
3436 flush_dcache_page(bh
->b_page
);
3439 err
= ext4_journal_dirty_metadata(handle
, bh
);
3441 /* Always do at least ordered writes for quotas */
3442 err
= ext4_jbd2_file_inode(handle
, inode
);
3443 mark_buffer_dirty(bh
);
3454 if (len
== towrite
) {
3455 mutex_unlock(&inode
->i_mutex
);
3458 if (inode
->i_size
< off
+len
-towrite
) {
3459 i_size_write(inode
, off
+len
-towrite
);
3460 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
3462 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
3463 ext4_mark_inode_dirty(handle
, inode
);
3464 mutex_unlock(&inode
->i_mutex
);
3465 return len
- towrite
;
3470 static int ext4_get_sb(struct file_system_type
*fs_type
,
3471 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
3473 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
, mnt
);
3476 static struct file_system_type ext4dev_fs_type
= {
3477 .owner
= THIS_MODULE
,
3479 .get_sb
= ext4_get_sb
,
3480 .kill_sb
= kill_block_super
,
3481 .fs_flags
= FS_REQUIRES_DEV
,
3484 static int __init
init_ext4_fs(void)
3488 err
= init_ext4_mballoc();
3492 err
= init_ext4_xattr();
3495 err
= init_inodecache();
3498 err
= register_filesystem(&ext4dev_fs_type
);
3503 destroy_inodecache();
3507 exit_ext4_mballoc();
3511 static void __exit
exit_ext4_fs(void)
3513 unregister_filesystem(&ext4dev_fs_type
);
3514 destroy_inodecache();
3516 exit_ext4_mballoc();
3519 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3520 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
3521 MODULE_LICENSE("GPL");
3522 module_init(init_ext4_fs
)
3523 module_exit(exit_ext4_fs
)