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
, int sync
);
54 static void ext4_mark_recovery_complete(struct super_block
*sb
,
55 struct ext4_super_block
*es
);
56 static void ext4_clear_journal_err(struct super_block
*sb
,
57 struct ext4_super_block
*es
);
58 static int ext4_sync_fs(struct super_block
*sb
, int wait
);
59 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
61 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
);
62 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
);
63 static void ext4_unlockfs(struct super_block
*sb
);
64 static void ext4_write_super(struct super_block
*sb
);
65 static void ext4_write_super_lockfs(struct super_block
*sb
);
68 ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
69 struct ext4_group_desc
*bg
)
71 return le32_to_cpu(bg
->bg_block_bitmap_lo
) |
72 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
73 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
76 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
77 struct ext4_group_desc
*bg
)
79 return le32_to_cpu(bg
->bg_inode_bitmap_lo
) |
80 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
81 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
84 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
85 struct ext4_group_desc
*bg
)
87 return le32_to_cpu(bg
->bg_inode_table_lo
) |
88 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
89 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
92 void ext4_block_bitmap_set(struct super_block
*sb
,
93 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
95 bg
->bg_block_bitmap_lo
= cpu_to_le32((u32
)blk
);
96 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
97 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
100 void ext4_inode_bitmap_set(struct super_block
*sb
,
101 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
103 bg
->bg_inode_bitmap_lo
= cpu_to_le32((u32
)blk
);
104 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
105 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
108 void ext4_inode_table_set(struct super_block
*sb
,
109 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
111 bg
->bg_inode_table_lo
= cpu_to_le32((u32
)blk
);
112 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
113 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
117 * Wrappers for jbd2_journal_start/end.
119 * The only special thing we need to do here is to make sure that all
120 * journal_end calls result in the superblock being marked dirty, so
121 * that sync() will call the filesystem's write_super callback if
124 handle_t
*ext4_journal_start_sb(struct super_block
*sb
, int nblocks
)
128 if (sb
->s_flags
& MS_RDONLY
)
129 return ERR_PTR(-EROFS
);
131 /* Special case here: if the journal has aborted behind our
132 * backs (eg. EIO in the commit thread), then we still need to
133 * take the FS itself readonly cleanly. */
134 journal
= EXT4_SB(sb
)->s_journal
;
135 if (is_journal_aborted(journal
)) {
136 ext4_abort(sb
, __func__
,
137 "Detected aborted journal");
138 return ERR_PTR(-EROFS
);
141 return jbd2_journal_start(journal
, nblocks
);
145 * The only special thing we need to do here is to make sure that all
146 * jbd2_journal_stop calls result in the superblock being marked dirty, so
147 * that sync() will call the filesystem's write_super callback if
150 int __ext4_journal_stop(const char *where
, handle_t
*handle
)
152 struct super_block
*sb
;
156 sb
= handle
->h_transaction
->t_journal
->j_private
;
158 rc
= jbd2_journal_stop(handle
);
163 __ext4_std_error(sb
, where
, err
);
167 void ext4_journal_abort_handle(const char *caller
, const char *err_fn
,
168 struct buffer_head
*bh
, handle_t
*handle
, int err
)
171 const char *errstr
= ext4_decode_error(NULL
, err
, nbuf
);
174 BUFFER_TRACE(bh
, "abort");
179 if (is_handle_aborted(handle
))
182 printk(KERN_ERR
"%s: aborting transaction: %s in %s\n",
183 caller
, errstr
, err_fn
);
185 jbd2_journal_abort_handle(handle
);
188 /* Deal with the reporting of failure conditions on a filesystem such as
189 * inconsistencies detected or read IO failures.
191 * On ext2, we can store the error state of the filesystem in the
192 * superblock. That is not possible on ext4, because we may have other
193 * write ordering constraints on the superblock which prevent us from
194 * writing it out straight away; and given that the journal is about to
195 * be aborted, we can't rely on the current, or future, transactions to
196 * write out the superblock safely.
198 * We'll just use the jbd2_journal_abort() error code to record an error in
199 * the journal instead. On recovery, the journal will compain about
200 * that error until we've noted it down and cleared it.
203 static void ext4_handle_error(struct super_block
*sb
)
205 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
207 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
208 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
210 if (sb
->s_flags
& MS_RDONLY
)
213 if (!test_opt(sb
, ERRORS_CONT
)) {
214 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
216 EXT4_SB(sb
)->s_mount_opt
|= EXT4_MOUNT_ABORT
;
218 jbd2_journal_abort(journal
, -EIO
);
220 if (test_opt(sb
, ERRORS_RO
)) {
221 printk(KERN_CRIT
"Remounting filesystem read-only\n");
222 sb
->s_flags
|= MS_RDONLY
;
224 ext4_commit_super(sb
, es
, 1);
225 if (test_opt(sb
, ERRORS_PANIC
))
226 panic("EXT4-fs (device %s): panic forced after error\n",
230 void ext4_error(struct super_block
*sb
, const char *function
,
231 const char *fmt
, ...)
236 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
241 ext4_handle_error(sb
);
244 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
251 errstr
= "IO failure";
254 errstr
= "Out of memory";
257 if (!sb
|| EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
)
258 errstr
= "Journal has aborted";
260 errstr
= "Readonly filesystem";
263 /* If the caller passed in an extra buffer for unknown
264 * errors, textualise them now. Else we just return
267 /* Check for truncated error codes... */
268 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
277 /* __ext4_std_error decodes expected errors from journaling functions
278 * automatically and invokes the appropriate error response. */
280 void __ext4_std_error(struct super_block
*sb
, const char *function
, int errno
)
285 /* Special case: if the error is EROFS, and we're not already
286 * inside a transaction, then there's really no point in logging
288 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
289 (sb
->s_flags
& MS_RDONLY
))
292 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
293 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s: %s\n",
294 sb
->s_id
, function
, errstr
);
296 ext4_handle_error(sb
);
300 * ext4_abort is a much stronger failure handler than ext4_error. The
301 * abort function may be used to deal with unrecoverable failures such
302 * as journal IO errors or ENOMEM at a critical moment in log management.
304 * We unconditionally force the filesystem into an ABORT|READONLY state,
305 * unless the error response on the fs has been set to panic in which
306 * case we take the easy way out and panic immediately.
309 void ext4_abort(struct super_block
*sb
, const char *function
,
310 const char *fmt
, ...)
314 printk(KERN_CRIT
"ext4_abort called.\n");
317 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ", sb
->s_id
, function
);
322 if (test_opt(sb
, ERRORS_PANIC
))
323 panic("EXT4-fs panic from previous error\n");
325 if (sb
->s_flags
& MS_RDONLY
)
328 printk(KERN_CRIT
"Remounting filesystem read-only\n");
329 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
330 sb
->s_flags
|= MS_RDONLY
;
331 EXT4_SB(sb
)->s_mount_opt
|= EXT4_MOUNT_ABORT
;
332 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
335 void ext4_warning(struct super_block
*sb
, const char *function
,
336 const char *fmt
, ...)
341 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s: ",
348 void ext4_update_dynamic_rev(struct super_block
*sb
)
350 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
352 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
355 ext4_warning(sb
, __func__
,
356 "updating to rev %d because of new feature flag, "
357 "running e2fsck is recommended",
360 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
361 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
362 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
363 /* leave es->s_feature_*compat flags alone */
364 /* es->s_uuid will be set by e2fsck if empty */
367 * The rest of the superblock fields should be zero, and if not it
368 * means they are likely already in use, so leave them alone. We
369 * can leave it up to e2fsck to clean up any inconsistencies there.
373 int ext4_update_compat_feature(handle_t
*handle
,
374 struct super_block
*sb
, __u32 compat
)
377 if (!EXT4_HAS_COMPAT_FEATURE(sb
, compat
)) {
378 err
= ext4_journal_get_write_access(handle
,
382 EXT4_SET_COMPAT_FEATURE(sb
, compat
);
385 BUFFER_TRACE(EXT4_SB(sb
)->s_sbh
,
386 "call ext4_journal_dirty_met adata");
387 err
= ext4_journal_dirty_metadata(handle
,
393 int ext4_update_rocompat_feature(handle_t
*handle
,
394 struct super_block
*sb
, __u32 rocompat
)
397 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, rocompat
)) {
398 err
= ext4_journal_get_write_access(handle
,
402 EXT4_SET_RO_COMPAT_FEATURE(sb
, rocompat
);
405 BUFFER_TRACE(EXT4_SB(sb
)->s_sbh
,
406 "call ext4_journal_dirty_met adata");
407 err
= ext4_journal_dirty_metadata(handle
,
413 int ext4_update_incompat_feature(handle_t
*handle
,
414 struct super_block
*sb
, __u32 incompat
)
417 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, incompat
)) {
418 err
= ext4_journal_get_write_access(handle
,
422 EXT4_SET_INCOMPAT_FEATURE(sb
, incompat
);
425 BUFFER_TRACE(EXT4_SB(sb
)->s_sbh
,
426 "call ext4_journal_dirty_met adata");
427 err
= ext4_journal_dirty_metadata(handle
,
434 * Open the external journal device
436 static struct block_device
*ext4_blkdev_get(dev_t dev
)
438 struct block_device
*bdev
;
439 char b
[BDEVNAME_SIZE
];
441 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
447 printk(KERN_ERR
"EXT4: failed to open journal device %s: %ld\n",
448 __bdevname(dev
, b
), PTR_ERR(bdev
));
453 * Release the journal device
455 static int ext4_blkdev_put(struct block_device
*bdev
)
458 return blkdev_put(bdev
);
461 static int ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
463 struct block_device
*bdev
;
466 bdev
= sbi
->journal_bdev
;
468 ret
= ext4_blkdev_put(bdev
);
469 sbi
->journal_bdev
= NULL
;
474 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
476 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
479 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
483 printk(KERN_ERR
"sb orphan head is %d\n",
484 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
486 printk(KERN_ERR
"sb_info orphan list:\n");
487 list_for_each(l
, &sbi
->s_orphan
) {
488 struct inode
*inode
= orphan_list_entry(l
);
490 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
491 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
492 inode
->i_mode
, inode
->i_nlink
,
497 static void ext4_put_super(struct super_block
*sb
)
499 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
500 struct ext4_super_block
*es
= sbi
->s_es
;
504 ext4_ext_release(sb
);
505 ext4_xattr_put_super(sb
);
506 jbd2_journal_destroy(sbi
->s_journal
);
507 sbi
->s_journal
= NULL
;
508 if (!(sb
->s_flags
& MS_RDONLY
)) {
509 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
510 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
511 BUFFER_TRACE(sbi
->s_sbh
, "marking dirty");
512 mark_buffer_dirty(sbi
->s_sbh
);
513 ext4_commit_super(sb
, es
, 1);
516 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
517 brelse(sbi
->s_group_desc
[i
]);
518 kfree(sbi
->s_group_desc
);
519 kfree(sbi
->s_flex_groups
);
520 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
521 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
522 percpu_counter_destroy(&sbi
->s_dirs_counter
);
525 for (i
= 0; i
< MAXQUOTAS
; i
++)
526 kfree(sbi
->s_qf_names
[i
]);
529 /* Debugging code just in case the in-memory inode orphan list
530 * isn't empty. The on-disk one can be non-empty if we've
531 * detected an error and taken the fs readonly, but the
532 * in-memory list had better be clean by this point. */
533 if (!list_empty(&sbi
->s_orphan
))
534 dump_orphan_list(sb
, sbi
);
535 J_ASSERT(list_empty(&sbi
->s_orphan
));
537 invalidate_bdev(sb
->s_bdev
);
538 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
540 * Invalidate the journal device's buffers. We don't want them
541 * floating about in memory - the physical journal device may
542 * hotswapped, and it breaks the `ro-after' testing code.
544 sync_blockdev(sbi
->journal_bdev
);
545 invalidate_bdev(sbi
->journal_bdev
);
546 ext4_blkdev_remove(sbi
);
548 sb
->s_fs_info
= NULL
;
553 static struct kmem_cache
*ext4_inode_cachep
;
556 * Called inside transaction, so use GFP_NOFS
558 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
560 struct ext4_inode_info
*ei
;
562 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
565 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
566 ei
->i_acl
= EXT4_ACL_NOT_CACHED
;
567 ei
->i_default_acl
= EXT4_ACL_NOT_CACHED
;
569 ei
->i_block_alloc_info
= NULL
;
570 ei
->vfs_inode
.i_version
= 1;
571 memset(&ei
->i_cached_extent
, 0, sizeof(struct ext4_ext_cache
));
572 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
573 spin_lock_init(&ei
->i_prealloc_lock
);
574 jbd2_journal_init_jbd_inode(&ei
->jinode
, &ei
->vfs_inode
);
575 ei
->i_reserved_data_blocks
= 0;
576 ei
->i_reserved_meta_blocks
= 0;
577 ei
->i_allocated_meta_blocks
= 0;
578 ei
->i_delalloc_reserved_flag
= 0;
579 spin_lock_init(&(ei
->i_block_reservation_lock
));
580 return &ei
->vfs_inode
;
583 static void ext4_destroy_inode(struct inode
*inode
)
585 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
586 printk("EXT4 Inode %p: orphan list check failed!\n",
588 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
589 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
593 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
596 static void init_once(void *foo
)
598 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
600 INIT_LIST_HEAD(&ei
->i_orphan
);
601 #ifdef CONFIG_EXT4DEV_FS_XATTR
602 init_rwsem(&ei
->xattr_sem
);
604 init_rwsem(&ei
->i_data_sem
);
605 inode_init_once(&ei
->vfs_inode
);
608 static int init_inodecache(void)
610 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
611 sizeof(struct ext4_inode_info
),
612 0, (SLAB_RECLAIM_ACCOUNT
|
615 if (ext4_inode_cachep
== NULL
)
620 static void destroy_inodecache(void)
622 kmem_cache_destroy(ext4_inode_cachep
);
625 static void ext4_clear_inode(struct inode
*inode
)
627 struct ext4_block_alloc_info
*rsv
= EXT4_I(inode
)->i_block_alloc_info
;
628 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
629 if (EXT4_I(inode
)->i_acl
&&
630 EXT4_I(inode
)->i_acl
!= EXT4_ACL_NOT_CACHED
) {
631 posix_acl_release(EXT4_I(inode
)->i_acl
);
632 EXT4_I(inode
)->i_acl
= EXT4_ACL_NOT_CACHED
;
634 if (EXT4_I(inode
)->i_default_acl
&&
635 EXT4_I(inode
)->i_default_acl
!= EXT4_ACL_NOT_CACHED
) {
636 posix_acl_release(EXT4_I(inode
)->i_default_acl
);
637 EXT4_I(inode
)->i_default_acl
= EXT4_ACL_NOT_CACHED
;
640 ext4_discard_reservation(inode
);
641 EXT4_I(inode
)->i_block_alloc_info
= NULL
;
644 jbd2_journal_release_jbd_inode(EXT4_SB(inode
->i_sb
)->s_journal
,
645 &EXT4_I(inode
)->jinode
);
648 static inline void ext4_show_quota_options(struct seq_file
*seq
,
649 struct super_block
*sb
)
651 #if defined(CONFIG_QUOTA)
652 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
654 if (sbi
->s_jquota_fmt
)
655 seq_printf(seq
, ",jqfmt=%s",
656 (sbi
->s_jquota_fmt
== QFMT_VFS_OLD
) ? "vfsold": "vfsv0");
658 if (sbi
->s_qf_names
[USRQUOTA
])
659 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
661 if (sbi
->s_qf_names
[GRPQUOTA
])
662 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
664 if (sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
)
665 seq_puts(seq
, ",usrquota");
667 if (sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
)
668 seq_puts(seq
, ",grpquota");
674 * - it's set to a non-default value OR
675 * - if the per-sb default is different from the global default
677 static int ext4_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
680 unsigned long def_mount_opts
;
681 struct super_block
*sb
= vfs
->mnt_sb
;
682 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
683 struct ext4_super_block
*es
= sbi
->s_es
;
685 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
686 def_errors
= le16_to_cpu(es
->s_errors
);
688 if (sbi
->s_sb_block
!= 1)
689 seq_printf(seq
, ",sb=%llu", sbi
->s_sb_block
);
690 if (test_opt(sb
, MINIX_DF
))
691 seq_puts(seq
, ",minixdf");
692 if (test_opt(sb
, GRPID
) && !(def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
693 seq_puts(seq
, ",grpid");
694 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
695 seq_puts(seq
, ",nogrpid");
696 if (sbi
->s_resuid
!= EXT4_DEF_RESUID
||
697 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
) {
698 seq_printf(seq
, ",resuid=%u", sbi
->s_resuid
);
700 if (sbi
->s_resgid
!= EXT4_DEF_RESGID
||
701 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
) {
702 seq_printf(seq
, ",resgid=%u", sbi
->s_resgid
);
704 if (test_opt(sb
, ERRORS_RO
)) {
705 if (def_errors
== EXT4_ERRORS_PANIC
||
706 def_errors
== EXT4_ERRORS_CONTINUE
) {
707 seq_puts(seq
, ",errors=remount-ro");
710 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
711 seq_puts(seq
, ",errors=continue");
712 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
713 seq_puts(seq
, ",errors=panic");
714 if (test_opt(sb
, NO_UID32
) && !(def_mount_opts
& EXT4_DEFM_UID16
))
715 seq_puts(seq
, ",nouid32");
716 if (test_opt(sb
, DEBUG
) && !(def_mount_opts
& EXT4_DEFM_DEBUG
))
717 seq_puts(seq
, ",debug");
718 if (test_opt(sb
, OLDALLOC
))
719 seq_puts(seq
, ",oldalloc");
720 #ifdef CONFIG_EXT4DEV_FS_XATTR
721 if (test_opt(sb
, XATTR_USER
) &&
722 !(def_mount_opts
& EXT4_DEFM_XATTR_USER
))
723 seq_puts(seq
, ",user_xattr");
724 if (!test_opt(sb
, XATTR_USER
) &&
725 (def_mount_opts
& EXT4_DEFM_XATTR_USER
)) {
726 seq_puts(seq
, ",nouser_xattr");
729 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
730 if (test_opt(sb
, POSIX_ACL
) && !(def_mount_opts
& EXT4_DEFM_ACL
))
731 seq_puts(seq
, ",acl");
732 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT4_DEFM_ACL
))
733 seq_puts(seq
, ",noacl");
735 if (!test_opt(sb
, RESERVATION
))
736 seq_puts(seq
, ",noreservation");
737 if (sbi
->s_commit_interval
) {
738 seq_printf(seq
, ",commit=%u",
739 (unsigned) (sbi
->s_commit_interval
/ HZ
));
742 * We're changing the default of barrier mount option, so
743 * let's always display its mount state so it's clear what its
746 seq_puts(seq
, ",barrier=");
747 seq_puts(seq
, test_opt(sb
, BARRIER
) ? "1" : "0");
748 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
))
749 seq_puts(seq
, ",journal_async_commit");
750 if (test_opt(sb
, NOBH
))
751 seq_puts(seq
, ",nobh");
752 if (!test_opt(sb
, EXTENTS
))
753 seq_puts(seq
, ",noextents");
754 if (!test_opt(sb
, MBALLOC
))
755 seq_puts(seq
, ",nomballoc");
756 if (test_opt(sb
, I_VERSION
))
757 seq_puts(seq
, ",i_version");
758 if (!test_opt(sb
, DELALLOC
))
759 seq_puts(seq
, ",nodelalloc");
763 seq_printf(seq
, ",stripe=%lu", sbi
->s_stripe
);
765 * journal mode get enabled in different ways
766 * So just print the value even if we didn't specify it
768 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
769 seq_puts(seq
, ",data=journal");
770 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
771 seq_puts(seq
, ",data=ordered");
772 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
773 seq_puts(seq
, ",data=writeback");
775 ext4_show_quota_options(seq
, sb
);
780 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
781 u64 ino
, u32 generation
)
785 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
786 return ERR_PTR(-ESTALE
);
787 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
788 return ERR_PTR(-ESTALE
);
790 /* iget isn't really right if the inode is currently unallocated!!
792 * ext4_read_inode will return a bad_inode if the inode had been
793 * deleted, so we should be safe.
795 * Currently we don't know the generation for parent directory, so
796 * a generation of 0 means "accept any"
798 inode
= ext4_iget(sb
, ino
);
800 return ERR_CAST(inode
);
801 if (generation
&& inode
->i_generation
!= generation
) {
803 return ERR_PTR(-ESTALE
);
809 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
810 int fh_len
, int fh_type
)
812 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
816 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
817 int fh_len
, int fh_type
)
819 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
824 #define QTYPE2NAME(t) ((t) == USRQUOTA?"user":"group")
825 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
827 static int ext4_dquot_initialize(struct inode
*inode
, int type
);
828 static int ext4_dquot_drop(struct inode
*inode
);
829 static int ext4_write_dquot(struct dquot
*dquot
);
830 static int ext4_acquire_dquot(struct dquot
*dquot
);
831 static int ext4_release_dquot(struct dquot
*dquot
);
832 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
833 static int ext4_write_info(struct super_block
*sb
, int type
);
834 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
835 char *path
, int remount
);
836 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
837 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
838 size_t len
, loff_t off
);
839 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
840 const char *data
, size_t len
, loff_t off
);
842 static struct dquot_operations ext4_quota_operations
= {
843 .initialize
= ext4_dquot_initialize
,
844 .drop
= ext4_dquot_drop
,
845 .alloc_space
= dquot_alloc_space
,
846 .alloc_inode
= dquot_alloc_inode
,
847 .free_space
= dquot_free_space
,
848 .free_inode
= dquot_free_inode
,
849 .transfer
= dquot_transfer
,
850 .write_dquot
= ext4_write_dquot
,
851 .acquire_dquot
= ext4_acquire_dquot
,
852 .release_dquot
= ext4_release_dquot
,
853 .mark_dirty
= ext4_mark_dquot_dirty
,
854 .write_info
= ext4_write_info
857 static struct quotactl_ops ext4_qctl_operations
= {
858 .quota_on
= ext4_quota_on
,
859 .quota_off
= vfs_quota_off
,
860 .quota_sync
= vfs_quota_sync
,
861 .get_info
= vfs_get_dqinfo
,
862 .set_info
= vfs_set_dqinfo
,
863 .get_dqblk
= vfs_get_dqblk
,
864 .set_dqblk
= vfs_set_dqblk
868 static const struct super_operations ext4_sops
= {
869 .alloc_inode
= ext4_alloc_inode
,
870 .destroy_inode
= ext4_destroy_inode
,
871 .write_inode
= ext4_write_inode
,
872 .dirty_inode
= ext4_dirty_inode
,
873 .delete_inode
= ext4_delete_inode
,
874 .put_super
= ext4_put_super
,
875 .write_super
= ext4_write_super
,
876 .sync_fs
= ext4_sync_fs
,
877 .write_super_lockfs
= ext4_write_super_lockfs
,
878 .unlockfs
= ext4_unlockfs
,
879 .statfs
= ext4_statfs
,
880 .remount_fs
= ext4_remount
,
881 .clear_inode
= ext4_clear_inode
,
882 .show_options
= ext4_show_options
,
884 .quota_read
= ext4_quota_read
,
885 .quota_write
= ext4_quota_write
,
889 static const struct export_operations ext4_export_ops
= {
890 .fh_to_dentry
= ext4_fh_to_dentry
,
891 .fh_to_parent
= ext4_fh_to_parent
,
892 .get_parent
= ext4_get_parent
,
896 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
897 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
898 Opt_nouid32
, Opt_nocheck
, Opt_debug
, Opt_oldalloc
, Opt_orlov
,
899 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
900 Opt_reservation
, Opt_noreservation
, Opt_noload
, Opt_nobh
, Opt_bh
,
901 Opt_commit
, Opt_journal_update
, Opt_journal_inum
, Opt_journal_dev
,
902 Opt_journal_checksum
, Opt_journal_async_commit
,
903 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
904 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
905 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_quota
, Opt_noquota
,
906 Opt_ignore
, Opt_barrier
, Opt_err
, Opt_resize
, Opt_usrquota
,
907 Opt_grpquota
, Opt_extents
, Opt_noextents
, Opt_i_version
,
908 Opt_mballoc
, Opt_nomballoc
, Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
,
911 static match_table_t tokens
= {
912 {Opt_bsd_df
, "bsddf"},
913 {Opt_minix_df
, "minixdf"},
914 {Opt_grpid
, "grpid"},
915 {Opt_grpid
, "bsdgroups"},
916 {Opt_nogrpid
, "nogrpid"},
917 {Opt_nogrpid
, "sysvgroups"},
918 {Opt_resgid
, "resgid=%u"},
919 {Opt_resuid
, "resuid=%u"},
921 {Opt_err_cont
, "errors=continue"},
922 {Opt_err_panic
, "errors=panic"},
923 {Opt_err_ro
, "errors=remount-ro"},
924 {Opt_nouid32
, "nouid32"},
925 {Opt_nocheck
, "nocheck"},
926 {Opt_nocheck
, "check=none"},
927 {Opt_debug
, "debug"},
928 {Opt_oldalloc
, "oldalloc"},
929 {Opt_orlov
, "orlov"},
930 {Opt_user_xattr
, "user_xattr"},
931 {Opt_nouser_xattr
, "nouser_xattr"},
933 {Opt_noacl
, "noacl"},
934 {Opt_reservation
, "reservation"},
935 {Opt_noreservation
, "noreservation"},
936 {Opt_noload
, "noload"},
939 {Opt_commit
, "commit=%u"},
940 {Opt_journal_update
, "journal=update"},
941 {Opt_journal_inum
, "journal=%u"},
942 {Opt_journal_dev
, "journal_dev=%u"},
943 {Opt_journal_checksum
, "journal_checksum"},
944 {Opt_journal_async_commit
, "journal_async_commit"},
945 {Opt_abort
, "abort"},
946 {Opt_data_journal
, "data=journal"},
947 {Opt_data_ordered
, "data=ordered"},
948 {Opt_data_writeback
, "data=writeback"},
949 {Opt_offusrjquota
, "usrjquota="},
950 {Opt_usrjquota
, "usrjquota=%s"},
951 {Opt_offgrpjquota
, "grpjquota="},
952 {Opt_grpjquota
, "grpjquota=%s"},
953 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
954 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
955 {Opt_grpquota
, "grpquota"},
956 {Opt_noquota
, "noquota"},
957 {Opt_quota
, "quota"},
958 {Opt_usrquota
, "usrquota"},
959 {Opt_barrier
, "barrier=%u"},
960 {Opt_extents
, "extents"},
961 {Opt_noextents
, "noextents"},
962 {Opt_i_version
, "i_version"},
963 {Opt_mballoc
, "mballoc"},
964 {Opt_nomballoc
, "nomballoc"},
965 {Opt_stripe
, "stripe=%u"},
966 {Opt_resize
, "resize"},
967 {Opt_delalloc
, "delalloc"},
968 {Opt_nodelalloc
, "nodelalloc"},
972 static ext4_fsblk_t
get_sb_block(void **data
)
974 ext4_fsblk_t sb_block
;
975 char *options
= (char *) *data
;
977 if (!options
|| strncmp(options
, "sb=", 3) != 0)
978 return 1; /* Default location */
980 /*todo: use simple_strtoll with >32bit ext4 */
981 sb_block
= simple_strtoul(options
, &options
, 0);
982 if (*options
&& *options
!= ',') {
983 printk("EXT4-fs: Invalid sb specification: %s\n",
989 *data
= (void *) options
;
993 static int parse_options(char *options
, struct super_block
*sb
,
994 unsigned int *inum
, unsigned long *journal_devnum
,
995 ext4_fsblk_t
*n_blocks_count
, int is_remount
)
997 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
999 substring_t args
[MAX_OPT_ARGS
];
1006 ext4_fsblk_t last_block
;
1011 while ((p
= strsep(&options
, ",")) != NULL
) {
1016 token
= match_token(p
, tokens
, args
);
1019 clear_opt(sbi
->s_mount_opt
, MINIX_DF
);
1022 set_opt(sbi
->s_mount_opt
, MINIX_DF
);
1025 set_opt(sbi
->s_mount_opt
, GRPID
);
1028 clear_opt(sbi
->s_mount_opt
, GRPID
);
1031 if (match_int(&args
[0], &option
))
1033 sbi
->s_resuid
= option
;
1036 if (match_int(&args
[0], &option
))
1038 sbi
->s_resgid
= option
;
1041 /* handled by get_sb_block() instead of here */
1042 /* *sb_block = match_int(&args[0]); */
1045 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1046 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1047 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1050 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1051 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1052 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1055 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1056 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1057 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1060 set_opt(sbi
->s_mount_opt
, NO_UID32
);
1063 clear_opt(sbi
->s_mount_opt
, CHECK
);
1066 set_opt(sbi
->s_mount_opt
, DEBUG
);
1069 set_opt(sbi
->s_mount_opt
, OLDALLOC
);
1072 clear_opt(sbi
->s_mount_opt
, OLDALLOC
);
1074 #ifdef CONFIG_EXT4DEV_FS_XATTR
1075 case Opt_user_xattr
:
1076 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
1078 case Opt_nouser_xattr
:
1079 clear_opt(sbi
->s_mount_opt
, XATTR_USER
);
1082 case Opt_user_xattr
:
1083 case Opt_nouser_xattr
:
1084 printk("EXT4 (no)user_xattr options not supported\n");
1087 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1089 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1092 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1097 printk("EXT4 (no)acl options not supported\n");
1100 case Opt_reservation
:
1101 set_opt(sbi
->s_mount_opt
, RESERVATION
);
1103 case Opt_noreservation
:
1104 clear_opt(sbi
->s_mount_opt
, RESERVATION
);
1106 case Opt_journal_update
:
1108 /* Eventually we will want to be able to create
1109 a journal file here. For now, only allow the
1110 user to specify an existing inode to be the
1113 printk(KERN_ERR
"EXT4-fs: cannot specify "
1114 "journal on remount\n");
1117 set_opt(sbi
->s_mount_opt
, UPDATE_JOURNAL
);
1119 case Opt_journal_inum
:
1121 printk(KERN_ERR
"EXT4-fs: cannot specify "
1122 "journal on remount\n");
1125 if (match_int(&args
[0], &option
))
1129 case Opt_journal_dev
:
1131 printk(KERN_ERR
"EXT4-fs: cannot specify "
1132 "journal on remount\n");
1135 if (match_int(&args
[0], &option
))
1137 *journal_devnum
= option
;
1139 case Opt_journal_checksum
:
1140 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1142 case Opt_journal_async_commit
:
1143 set_opt(sbi
->s_mount_opt
, JOURNAL_ASYNC_COMMIT
);
1144 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1147 set_opt(sbi
->s_mount_opt
, NOLOAD
);
1150 if (match_int(&args
[0], &option
))
1155 option
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1156 sbi
->s_commit_interval
= HZ
* option
;
1158 case Opt_data_journal
:
1159 data_opt
= EXT4_MOUNT_JOURNAL_DATA
;
1161 case Opt_data_ordered
:
1162 data_opt
= EXT4_MOUNT_ORDERED_DATA
;
1164 case Opt_data_writeback
:
1165 data_opt
= EXT4_MOUNT_WRITEBACK_DATA
;
1168 if ((sbi
->s_mount_opt
& EXT4_MOUNT_DATA_FLAGS
)
1171 "EXT4-fs: cannot change data "
1172 "mode on remount\n");
1176 sbi
->s_mount_opt
&= ~EXT4_MOUNT_DATA_FLAGS
;
1177 sbi
->s_mount_opt
|= data_opt
;
1187 if ((sb_any_quota_enabled(sb
) ||
1188 sb_any_quota_suspended(sb
)) &&
1189 !sbi
->s_qf_names
[qtype
]) {
1191 "EXT4-fs: Cannot change journaled "
1192 "quota options when quota turned on.\n");
1195 qname
= match_strdup(&args
[0]);
1198 "EXT4-fs: not enough memory for "
1199 "storing quotafile name.\n");
1202 if (sbi
->s_qf_names
[qtype
] &&
1203 strcmp(sbi
->s_qf_names
[qtype
], qname
)) {
1205 "EXT4-fs: %s quota file already "
1206 "specified.\n", QTYPE2NAME(qtype
));
1210 sbi
->s_qf_names
[qtype
] = qname
;
1211 if (strchr(sbi
->s_qf_names
[qtype
], '/')) {
1213 "EXT4-fs: quotafile must be on "
1214 "filesystem root.\n");
1215 kfree(sbi
->s_qf_names
[qtype
]);
1216 sbi
->s_qf_names
[qtype
] = NULL
;
1219 set_opt(sbi
->s_mount_opt
, QUOTA
);
1221 case Opt_offusrjquota
:
1224 case Opt_offgrpjquota
:
1227 if ((sb_any_quota_enabled(sb
) ||
1228 sb_any_quota_suspended(sb
)) &&
1229 sbi
->s_qf_names
[qtype
]) {
1230 printk(KERN_ERR
"EXT4-fs: Cannot change "
1231 "journaled quota options when "
1232 "quota turned on.\n");
1236 * The space will be released later when all options
1237 * are confirmed to be correct
1239 sbi
->s_qf_names
[qtype
] = NULL
;
1241 case Opt_jqfmt_vfsold
:
1242 qfmt
= QFMT_VFS_OLD
;
1244 case Opt_jqfmt_vfsv0
:
1247 if ((sb_any_quota_enabled(sb
) ||
1248 sb_any_quota_suspended(sb
)) &&
1249 sbi
->s_jquota_fmt
!= qfmt
) {
1250 printk(KERN_ERR
"EXT4-fs: Cannot change "
1251 "journaled quota options when "
1252 "quota turned on.\n");
1255 sbi
->s_jquota_fmt
= qfmt
;
1259 set_opt(sbi
->s_mount_opt
, QUOTA
);
1260 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
1263 set_opt(sbi
->s_mount_opt
, QUOTA
);
1264 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1267 if (sb_any_quota_enabled(sb
)) {
1268 printk(KERN_ERR
"EXT4-fs: Cannot change quota "
1269 "options when quota turned on.\n");
1272 clear_opt(sbi
->s_mount_opt
, QUOTA
);
1273 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1274 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1281 "EXT4-fs: quota options not supported.\n");
1285 case Opt_offusrjquota
:
1286 case Opt_offgrpjquota
:
1287 case Opt_jqfmt_vfsold
:
1288 case Opt_jqfmt_vfsv0
:
1290 "EXT4-fs: journaled quota options not "
1297 set_opt(sbi
->s_mount_opt
, ABORT
);
1300 if (match_int(&args
[0], &option
))
1303 set_opt(sbi
->s_mount_opt
, BARRIER
);
1305 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1311 printk("EXT4-fs: resize option only available "
1315 if (match_int(&args
[0], &option
) != 0)
1317 *n_blocks_count
= option
;
1320 set_opt(sbi
->s_mount_opt
, NOBH
);
1323 clear_opt(sbi
->s_mount_opt
, NOBH
);
1326 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
,
1327 EXT4_FEATURE_INCOMPAT_EXTENTS
)) {
1328 ext4_warning(sb
, __func__
,
1329 "extents feature not enabled "
1330 "on this filesystem, use tune2fs\n");
1333 set_opt(sbi
->s_mount_opt
, EXTENTS
);
1337 * When e2fsprogs support resizing an already existing
1338 * ext3 file system to greater than 2**32 we need to
1339 * add support to block allocator to handle growing
1340 * already existing block mapped inode so that blocks
1341 * allocated for them fall within 2**32
1343 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
1344 if (last_block
> 0xffffffffULL
) {
1345 printk(KERN_ERR
"EXT4-fs: Filesystem too "
1346 "large to mount with "
1347 "-o noextents options\n");
1350 clear_opt(sbi
->s_mount_opt
, EXTENTS
);
1353 set_opt(sbi
->s_mount_opt
, I_VERSION
);
1354 sb
->s_flags
|= MS_I_VERSION
;
1356 case Opt_nodelalloc
:
1357 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
1360 set_opt(sbi
->s_mount_opt
, MBALLOC
);
1363 clear_opt(sbi
->s_mount_opt
, MBALLOC
);
1366 if (match_int(&args
[0], &option
))
1370 sbi
->s_stripe
= option
;
1373 set_opt(sbi
->s_mount_opt
, DELALLOC
);
1377 "EXT4-fs: Unrecognized mount option \"%s\" "
1378 "or missing value\n", p
);
1383 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1384 if ((sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
) &&
1385 sbi
->s_qf_names
[USRQUOTA
])
1386 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1388 if ((sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
) &&
1389 sbi
->s_qf_names
[GRPQUOTA
])
1390 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1392 if ((sbi
->s_qf_names
[USRQUOTA
] &&
1393 (sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
)) ||
1394 (sbi
->s_qf_names
[GRPQUOTA
] &&
1395 (sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
))) {
1396 printk(KERN_ERR
"EXT4-fs: old and new quota "
1397 "format mixing.\n");
1401 if (!sbi
->s_jquota_fmt
) {
1402 printk(KERN_ERR
"EXT4-fs: journaled quota format "
1403 "not specified.\n");
1407 if (sbi
->s_jquota_fmt
) {
1408 printk(KERN_ERR
"EXT4-fs: journaled quota format "
1409 "specified with no journaling "
1418 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1421 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1424 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1425 printk(KERN_ERR
"EXT4-fs warning: revision level too high, "
1426 "forcing read-only mode\n");
1431 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1432 printk(KERN_WARNING
"EXT4-fs warning: mounting unchecked fs, "
1433 "running e2fsck is recommended\n");
1434 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1436 "EXT4-fs warning: mounting fs with errors, "
1437 "running e2fsck is recommended\n");
1438 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
1439 le16_to_cpu(es
->s_mnt_count
) >=
1440 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1442 "EXT4-fs warning: maximal mount count reached, "
1443 "running e2fsck is recommended\n");
1444 else if (le32_to_cpu(es
->s_checkinterval
) &&
1445 (le32_to_cpu(es
->s_lastcheck
) +
1446 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1448 "EXT4-fs warning: checktime reached, "
1449 "running e2fsck is recommended\n");
1451 /* @@@ We _will_ want to clear the valid bit if we find
1452 * inconsistencies, to force a fsck at reboot. But for
1453 * a plain journaled filesystem we can keep it set as
1456 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1458 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1459 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1460 le16_add_cpu(&es
->s_mnt_count
, 1);
1461 es
->s_mtime
= cpu_to_le32(get_seconds());
1462 ext4_update_dynamic_rev(sb
);
1463 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1465 ext4_commit_super(sb
, es
, 1);
1466 if (test_opt(sb
, DEBUG
))
1467 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%lu, "
1468 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1470 sbi
->s_groups_count
,
1471 EXT4_BLOCKS_PER_GROUP(sb
),
1472 EXT4_INODES_PER_GROUP(sb
),
1475 printk(KERN_INFO
"EXT4 FS on %s, ", sb
->s_id
);
1476 if (EXT4_SB(sb
)->s_journal
->j_inode
== NULL
) {
1477 char b
[BDEVNAME_SIZE
];
1479 printk("external journal on %s\n",
1480 bdevname(EXT4_SB(sb
)->s_journal
->j_dev
, b
));
1482 printk("internal journal\n");
1487 static int ext4_fill_flex_info(struct super_block
*sb
)
1489 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1490 struct ext4_group_desc
*gdp
= NULL
;
1491 struct buffer_head
*bh
;
1492 ext4_group_t flex_group_count
;
1493 ext4_group_t flex_group
;
1494 int groups_per_flex
= 0;
1495 __u64 block_bitmap
= 0;
1498 if (!sbi
->s_es
->s_log_groups_per_flex
) {
1499 sbi
->s_log_groups_per_flex
= 0;
1503 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1504 groups_per_flex
= 1 << sbi
->s_log_groups_per_flex
;
1506 flex_group_count
= (sbi
->s_groups_count
+ groups_per_flex
- 1) /
1508 sbi
->s_flex_groups
= kzalloc(flex_group_count
*
1509 sizeof(struct flex_groups
), GFP_KERNEL
);
1510 if (sbi
->s_flex_groups
== NULL
) {
1511 printk(KERN_ERR
"EXT4-fs: not enough memory for "
1512 "%lu flex groups\n", flex_group_count
);
1516 gdp
= ext4_get_group_desc(sb
, 1, &bh
);
1517 block_bitmap
= ext4_block_bitmap(sb
, gdp
) - 1;
1519 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1520 gdp
= ext4_get_group_desc(sb
, i
, &bh
);
1522 flex_group
= ext4_flex_group(sbi
, i
);
1523 sbi
->s_flex_groups
[flex_group
].free_inodes
+=
1524 le16_to_cpu(gdp
->bg_free_inodes_count
);
1525 sbi
->s_flex_groups
[flex_group
].free_blocks
+=
1526 le16_to_cpu(gdp
->bg_free_blocks_count
);
1534 __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
1535 struct ext4_group_desc
*gdp
)
1539 if (sbi
->s_es
->s_feature_ro_compat
&
1540 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) {
1541 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
1542 __le32 le_group
= cpu_to_le32(block_group
);
1544 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
1545 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
1546 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
1547 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
1548 /* for checksum of struct ext4_group_desc do the rest...*/
1549 if ((sbi
->s_es
->s_feature_incompat
&
1550 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
1551 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
1552 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
1553 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
1557 return cpu_to_le16(crc
);
1560 int ext4_group_desc_csum_verify(struct ext4_sb_info
*sbi
, __u32 block_group
,
1561 struct ext4_group_desc
*gdp
)
1563 if ((sbi
->s_es
->s_feature_ro_compat
&
1564 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) &&
1565 (gdp
->bg_checksum
!= ext4_group_desc_csum(sbi
, block_group
, gdp
)))
1571 /* Called at mount-time, super-block is locked */
1572 static int ext4_check_descriptors(struct super_block
*sb
)
1574 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1575 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
1576 ext4_fsblk_t last_block
;
1577 ext4_fsblk_t block_bitmap
;
1578 ext4_fsblk_t inode_bitmap
;
1579 ext4_fsblk_t inode_table
;
1580 int flexbg_flag
= 0;
1583 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
1586 ext4_debug ("Checking group descriptors");
1588 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1589 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1591 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
1592 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
1594 last_block
= first_block
+
1595 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
1597 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
1598 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
1599 printk(KERN_ERR
"EXT4-fs: ext4_check_descriptors: "
1600 "Block bitmap for group %lu not in group "
1601 "(block %llu)!", i
, block_bitmap
);
1604 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
1605 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
1606 printk(KERN_ERR
"EXT4-fs: ext4_check_descriptors: "
1607 "Inode bitmap for group %lu not in group "
1608 "(block %llu)!", i
, inode_bitmap
);
1611 inode_table
= ext4_inode_table(sb
, gdp
);
1612 if (inode_table
< first_block
||
1613 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
1614 printk(KERN_ERR
"EXT4-fs: ext4_check_descriptors: "
1615 "Inode table for group %lu not in group "
1616 "(block %llu)!", i
, inode_table
);
1619 spin_lock(sb_bgl_lock(sbi
, i
));
1620 if (!ext4_group_desc_csum_verify(sbi
, i
, gdp
)) {
1621 printk(KERN_ERR
"EXT4-fs: ext4_check_descriptors: "
1622 "Checksum for group %lu failed (%u!=%u)\n",
1623 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
1624 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
1625 if (!(sb
->s_flags
& MS_RDONLY
))
1628 spin_unlock(sb_bgl_lock(sbi
, i
));
1630 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
1633 ext4_free_blocks_count_set(sbi
->s_es
, ext4_count_free_blocks(sb
));
1634 sbi
->s_es
->s_free_inodes_count
= cpu_to_le32(ext4_count_free_inodes(sb
));
1638 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1639 * the superblock) which were deleted from all directories, but held open by
1640 * a process at the time of a crash. We walk the list and try to delete these
1641 * inodes at recovery time (only with a read-write filesystem).
1643 * In order to keep the orphan inode chain consistent during traversal (in
1644 * case of crash during recovery), we link each inode into the superblock
1645 * orphan list_head and handle it the same way as an inode deletion during
1646 * normal operation (which journals the operations for us).
1648 * We only do an iget() and an iput() on each inode, which is very safe if we
1649 * accidentally point at an in-use or already deleted inode. The worst that
1650 * can happen in this case is that we get a "bit already cleared" message from
1651 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1652 * e2fsck was run on this filesystem, and it must have already done the orphan
1653 * inode cleanup for us, so we can safely abort without any further action.
1655 static void ext4_orphan_cleanup(struct super_block
*sb
,
1656 struct ext4_super_block
*es
)
1658 unsigned int s_flags
= sb
->s_flags
;
1659 int nr_orphans
= 0, nr_truncates
= 0;
1663 if (!es
->s_last_orphan
) {
1664 jbd_debug(4, "no orphan inodes to clean up\n");
1668 if (bdev_read_only(sb
->s_bdev
)) {
1669 printk(KERN_ERR
"EXT4-fs: write access "
1670 "unavailable, skipping orphan cleanup.\n");
1674 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
1675 if (es
->s_last_orphan
)
1676 jbd_debug(1, "Errors on filesystem, "
1677 "clearing orphan list.\n");
1678 es
->s_last_orphan
= 0;
1679 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1683 if (s_flags
& MS_RDONLY
) {
1684 printk(KERN_INFO
"EXT4-fs: %s: orphan cleanup on readonly fs\n",
1686 sb
->s_flags
&= ~MS_RDONLY
;
1689 /* Needed for iput() to work correctly and not trash data */
1690 sb
->s_flags
|= MS_ACTIVE
;
1691 /* Turn on quotas so that they are updated correctly */
1692 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1693 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
1694 int ret
= ext4_quota_on_mount(sb
, i
);
1697 "EXT4-fs: Cannot turn on journaled "
1698 "quota: error %d\n", ret
);
1703 while (es
->s_last_orphan
) {
1704 struct inode
*inode
;
1706 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
1707 if (IS_ERR(inode
)) {
1708 es
->s_last_orphan
= 0;
1712 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
1714 if (inode
->i_nlink
) {
1716 "%s: truncating inode %lu to %Ld bytes\n",
1717 __func__
, inode
->i_ino
, inode
->i_size
);
1718 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1719 inode
->i_ino
, inode
->i_size
);
1720 ext4_truncate(inode
);
1724 "%s: deleting unreferenced inode %lu\n",
1725 __func__
, inode
->i_ino
);
1726 jbd_debug(2, "deleting unreferenced inode %lu\n",
1730 iput(inode
); /* The delete magic happens here! */
1733 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
1736 printk(KERN_INFO
"EXT4-fs: %s: %d orphan inode%s deleted\n",
1737 sb
->s_id
, PLURAL(nr_orphans
));
1739 printk(KERN_INFO
"EXT4-fs: %s: %d truncate%s cleaned up\n",
1740 sb
->s_id
, PLURAL(nr_truncates
));
1742 /* Turn quotas off */
1743 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1744 if (sb_dqopt(sb
)->files
[i
])
1745 vfs_quota_off(sb
, i
, 0);
1748 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
1751 * Maximal extent format file size.
1752 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1753 * extent format containers, within a sector_t, and within i_blocks
1754 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1755 * so that won't be a limiting factor.
1757 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1759 static loff_t
ext4_max_size(int blkbits
)
1762 loff_t upper_limit
= MAX_LFS_FILESIZE
;
1764 /* small i_blocks in vfs inode? */
1765 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
1767 * CONFIG_LSF is not enabled implies the inode
1768 * i_block represent total blocks in 512 bytes
1769 * 32 == size of vfs inode i_blocks * 8
1771 upper_limit
= (1LL << 32) - 1;
1773 /* total blocks in file system block size */
1774 upper_limit
>>= (blkbits
- 9);
1775 upper_limit
<<= blkbits
;
1778 /* 32-bit extent-start container, ee_block */
1783 /* Sanity check against vm- & vfs- imposed limits */
1784 if (res
> upper_limit
)
1791 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
1792 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1793 * We need to be 1 filesystem block less than the 2^48 sector limit.
1795 static loff_t
ext4_max_bitmap_size(int bits
)
1797 loff_t res
= EXT4_NDIR_BLOCKS
;
1800 /* This is calculated to be the largest file size for a
1801 * dense, bitmapped file such that the total number of
1802 * sectors in the file, including data and all indirect blocks,
1803 * does not exceed 2^48 -1
1804 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1805 * total number of 512 bytes blocks of the file
1808 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
1810 * CONFIG_LSF is not enabled implies the inode
1811 * i_block represent total blocks in 512 bytes
1812 * 32 == size of vfs inode i_blocks * 8
1814 upper_limit
= (1LL << 32) - 1;
1816 /* total blocks in file system block size */
1817 upper_limit
>>= (bits
- 9);
1821 * We use 48 bit ext4_inode i_blocks
1822 * With EXT4_HUGE_FILE_FL set the i_blocks
1823 * represent total number of blocks in
1824 * file system block size
1826 upper_limit
= (1LL << 48) - 1;
1830 /* indirect blocks */
1832 /* double indirect blocks */
1833 meta_blocks
+= 1 + (1LL << (bits
-2));
1834 /* tripple indirect blocks */
1835 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
1837 upper_limit
-= meta_blocks
;
1838 upper_limit
<<= bits
;
1840 res
+= 1LL << (bits
-2);
1841 res
+= 1LL << (2*(bits
-2));
1842 res
+= 1LL << (3*(bits
-2));
1844 if (res
> upper_limit
)
1847 if (res
> MAX_LFS_FILESIZE
)
1848 res
= MAX_LFS_FILESIZE
;
1853 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
1854 ext4_fsblk_t logical_sb_block
, int nr
)
1856 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1857 ext4_group_t bg
, first_meta_bg
;
1860 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
1862 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
1864 return logical_sb_block
+ nr
+ 1;
1865 bg
= sbi
->s_desc_per_block
* nr
;
1866 if (ext4_bg_has_super(sb
, bg
))
1868 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
1872 * ext4_get_stripe_size: Get the stripe size.
1873 * @sbi: In memory super block info
1875 * If we have specified it via mount option, then
1876 * use the mount option value. If the value specified at mount time is
1877 * greater than the blocks per group use the super block value.
1878 * If the super block value is greater than blocks per group return 0.
1879 * Allocator needs it be less than blocks per group.
1882 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
1884 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
1885 unsigned long stripe_width
=
1886 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
1888 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
1889 return sbi
->s_stripe
;
1891 if (stripe_width
<= sbi
->s_blocks_per_group
)
1892 return stripe_width
;
1894 if (stride
<= sbi
->s_blocks_per_group
)
1900 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
1901 __releases(kernel_lock
)
1902 __acquires(kernel_lock
)
1905 struct buffer_head
*bh
;
1906 struct ext4_super_block
*es
= NULL
;
1907 struct ext4_sb_info
*sbi
;
1909 ext4_fsblk_t sb_block
= get_sb_block(&data
);
1910 ext4_fsblk_t logical_sb_block
;
1911 unsigned long offset
= 0;
1912 unsigned int journal_inum
= 0;
1913 unsigned long journal_devnum
= 0;
1914 unsigned long def_mount_opts
;
1925 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
1928 sb
->s_fs_info
= sbi
;
1929 sbi
->s_mount_opt
= 0;
1930 sbi
->s_resuid
= EXT4_DEF_RESUID
;
1931 sbi
->s_resgid
= EXT4_DEF_RESGID
;
1932 sbi
->s_sb_block
= sb_block
;
1936 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
1938 printk(KERN_ERR
"EXT4-fs: unable to set blocksize\n");
1943 * The ext4 superblock will not be buffer aligned for other than 1kB
1944 * block sizes. We need to calculate the offset from buffer start.
1946 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
1947 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
1948 offset
= do_div(logical_sb_block
, blocksize
);
1950 logical_sb_block
= sb_block
;
1953 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
1954 printk(KERN_ERR
"EXT4-fs: unable to read superblock\n");
1958 * Note: s_es must be initialized as soon as possible because
1959 * some ext4 macro-instructions depend on its value
1961 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
1963 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
1964 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
1967 /* Set defaults before we parse the mount options */
1968 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
1969 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
1970 set_opt(sbi
->s_mount_opt
, DEBUG
);
1971 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
1972 set_opt(sbi
->s_mount_opt
, GRPID
);
1973 if (def_mount_opts
& EXT4_DEFM_UID16
)
1974 set_opt(sbi
->s_mount_opt
, NO_UID32
);
1975 #ifdef CONFIG_EXT4DEV_FS_XATTR
1976 if (def_mount_opts
& EXT4_DEFM_XATTR_USER
)
1977 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
1979 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1980 if (def_mount_opts
& EXT4_DEFM_ACL
)
1981 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1983 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
1984 sbi
->s_mount_opt
|= EXT4_MOUNT_JOURNAL_DATA
;
1985 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
1986 sbi
->s_mount_opt
|= EXT4_MOUNT_ORDERED_DATA
;
1987 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
1988 sbi
->s_mount_opt
|= EXT4_MOUNT_WRITEBACK_DATA
;
1990 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
1991 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1992 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
1993 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1995 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1997 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
1998 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
2000 set_opt(sbi
->s_mount_opt
, RESERVATION
);
2001 set_opt(sbi
->s_mount_opt
, BARRIER
);
2004 * turn on extents feature by default in ext4 filesystem
2005 * only if feature flag already set by mkfs or tune2fs.
2006 * Use -o noextents to turn it off
2008 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_EXTENTS
))
2009 set_opt(sbi
->s_mount_opt
, EXTENTS
);
2011 ext4_warning(sb
, __func__
,
2012 "extents feature not enabled on this filesystem, "
2015 * turn on mballoc code by default in ext4 filesystem
2016 * Use -o nomballoc to turn it off
2018 set_opt(sbi
->s_mount_opt
, MBALLOC
);
2021 * enable delayed allocation by default
2022 * Use -o nodelalloc to turn it off
2024 set_opt(sbi
->s_mount_opt
, DELALLOC
);
2027 if (!parse_options((char *) data
, sb
, &journal_inum
, &journal_devnum
,
2031 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
2032 ((sbi
->s_mount_opt
& EXT4_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
2034 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
2035 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
2036 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
2037 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
2039 "EXT4-fs warning: feature flags set on rev 0 fs, "
2040 "running e2fsck is recommended\n");
2043 * Since ext4 is still considered development code, we require
2044 * that the TEST_FILESYS flag in s->flags be set.
2046 if (!(le32_to_cpu(es
->s_flags
) & EXT2_FLAGS_TEST_FILESYS
)) {
2047 printk(KERN_WARNING
"EXT4-fs: %s: not marked "
2048 "OK to use with test code.\n", sb
->s_id
);
2053 * Check feature flags regardless of the revision level, since we
2054 * previously didn't change the revision level when setting the flags,
2055 * so there is a chance incompat flags are set on a rev 0 filesystem.
2057 features
= EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
);
2059 printk(KERN_ERR
"EXT4-fs: %s: couldn't mount because of "
2060 "unsupported optional features (%x).\n",
2061 sb
->s_id
, le32_to_cpu(features
));
2064 features
= EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
);
2065 if (!(sb
->s_flags
& MS_RDONLY
) && features
) {
2066 printk(KERN_ERR
"EXT4-fs: %s: couldn't mount RDWR because of "
2067 "unsupported optional features (%x).\n",
2068 sb
->s_id
, le32_to_cpu(features
));
2071 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
2073 * Large file size enabled file system can only be
2074 * mount if kernel is build with CONFIG_LSF
2076 if (sizeof(root
->i_blocks
) < sizeof(u64
) &&
2077 !(sb
->s_flags
& MS_RDONLY
)) {
2078 printk(KERN_ERR
"EXT4-fs: %s: Filesystem with huge "
2079 "files cannot be mounted read-write "
2080 "without CONFIG_LSF.\n", sb
->s_id
);
2084 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
2086 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
2087 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
2089 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
2090 blocksize
, sb
->s_id
);
2094 if (sb
->s_blocksize
!= blocksize
) {
2096 /* Validate the filesystem blocksize */
2097 if (!sb_set_blocksize(sb
, blocksize
)) {
2098 printk(KERN_ERR
"EXT4-fs: bad block size %d.\n",
2104 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2105 offset
= do_div(logical_sb_block
, blocksize
);
2106 bh
= sb_bread(sb
, logical_sb_block
);
2109 "EXT4-fs: Can't read superblock on 2nd try.\n");
2112 es
= (struct ext4_super_block
*)(((char *)bh
->b_data
) + offset
);
2114 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
2116 "EXT4-fs: Magic mismatch, very weird !\n");
2121 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
);
2122 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
);
2124 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
2125 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
2126 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
2128 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
2129 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
2130 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
2131 (!is_power_of_2(sbi
->s_inode_size
)) ||
2132 (sbi
->s_inode_size
> blocksize
)) {
2134 "EXT4-fs: unsupported inode size: %d\n",
2138 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
2139 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
2141 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
2142 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
2143 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
2144 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
2145 !is_power_of_2(sbi
->s_desc_size
)) {
2147 "EXT4-fs: unsupported descriptor size %lu\n",
2152 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
2153 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
2154 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
2155 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
2157 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
2158 if (sbi
->s_inodes_per_block
== 0)
2160 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
2161 sbi
->s_inodes_per_block
;
2162 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
2164 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
2165 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
2166 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
2167 for (i
= 0; i
< 4; i
++)
2168 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
2169 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
2171 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
2173 "EXT4-fs: #blocks per group too big: %lu\n",
2174 sbi
->s_blocks_per_group
);
2177 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
2179 "EXT4-fs: #inodes per group too big: %lu\n",
2180 sbi
->s_inodes_per_group
);
2184 if (ext4_blocks_count(es
) >
2185 (sector_t
)(~0ULL) >> (sb
->s_blocksize_bits
- 9)) {
2186 printk(KERN_ERR
"EXT4-fs: filesystem on %s:"
2187 " too large to mount safely\n", sb
->s_id
);
2188 if (sizeof(sector_t
) < 8)
2189 printk(KERN_WARNING
"EXT4-fs: CONFIG_LBD not "
2194 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
2197 /* ensure blocks_count calculation below doesn't sign-extend */
2198 if (ext4_blocks_count(es
) + EXT4_BLOCKS_PER_GROUP(sb
) <
2199 le32_to_cpu(es
->s_first_data_block
) + 1) {
2200 printk(KERN_WARNING
"EXT4-fs: bad geometry: block count %llu, "
2201 "first data block %u, blocks per group %lu\n",
2202 ext4_blocks_count(es
),
2203 le32_to_cpu(es
->s_first_data_block
),
2204 EXT4_BLOCKS_PER_GROUP(sb
));
2207 blocks_count
= (ext4_blocks_count(es
) -
2208 le32_to_cpu(es
->s_first_data_block
) +
2209 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2210 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
2211 sbi
->s_groups_count
= blocks_count
;
2212 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
2213 EXT4_DESC_PER_BLOCK(sb
);
2214 sbi
->s_group_desc
= kmalloc(db_count
* sizeof(struct buffer_head
*),
2216 if (sbi
->s_group_desc
== NULL
) {
2217 printk(KERN_ERR
"EXT4-fs: not enough memory\n");
2221 bgl_lock_init(&sbi
->s_blockgroup_lock
);
2223 for (i
= 0; i
< db_count
; i
++) {
2224 block
= descriptor_loc(sb
, logical_sb_block
, i
);
2225 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
2226 if (!sbi
->s_group_desc
[i
]) {
2227 printk(KERN_ERR
"EXT4-fs: "
2228 "can't read group descriptor %d\n", i
);
2233 if (!ext4_check_descriptors(sb
)) {
2234 printk(KERN_ERR
"EXT4-fs: group descriptors corrupted!\n");
2237 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
2238 if (!ext4_fill_flex_info(sb
)) {
2240 "EXT4-fs: unable to initialize "
2241 "flex_bg meta info!\n");
2245 sbi
->s_gdb_count
= db_count
;
2246 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
2247 spin_lock_init(&sbi
->s_next_gen_lock
);
2249 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
2250 ext4_count_free_blocks(sb
));
2252 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
2253 ext4_count_free_inodes(sb
));
2256 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
2257 ext4_count_dirs(sb
));
2260 printk(KERN_ERR
"EXT4-fs: insufficient memory\n");
2264 /* per fileystem reservation list head & lock */
2265 spin_lock_init(&sbi
->s_rsv_window_lock
);
2266 sbi
->s_rsv_window_root
= RB_ROOT
;
2267 /* Add a single, static dummy reservation to the start of the
2268 * reservation window list --- it gives us a placeholder for
2269 * append-at-start-of-list which makes the allocation logic
2270 * _much_ simpler. */
2271 sbi
->s_rsv_window_head
.rsv_start
= EXT4_RESERVE_WINDOW_NOT_ALLOCATED
;
2272 sbi
->s_rsv_window_head
.rsv_end
= EXT4_RESERVE_WINDOW_NOT_ALLOCATED
;
2273 sbi
->s_rsv_window_head
.rsv_alloc_hit
= 0;
2274 sbi
->s_rsv_window_head
.rsv_goal_size
= 0;
2275 ext4_rsv_window_add(sb
, &sbi
->s_rsv_window_head
);
2277 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
2280 * set up enough so that it can read an inode
2282 sb
->s_op
= &ext4_sops
;
2283 sb
->s_export_op
= &ext4_export_ops
;
2284 sb
->s_xattr
= ext4_xattr_handlers
;
2286 sb
->s_qcop
= &ext4_qctl_operations
;
2287 sb
->dq_op
= &ext4_quota_operations
;
2289 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
2293 needs_recovery
= (es
->s_last_orphan
!= 0 ||
2294 EXT4_HAS_INCOMPAT_FEATURE(sb
,
2295 EXT4_FEATURE_INCOMPAT_RECOVER
));
2298 * The first inode we look at is the journal inode. Don't try
2299 * root first: it may be modified in the journal!
2301 if (!test_opt(sb
, NOLOAD
) &&
2302 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
2303 if (ext4_load_journal(sb
, es
, journal_devnum
))
2305 if (!(sb
->s_flags
& MS_RDONLY
) &&
2306 EXT4_SB(sb
)->s_journal
->j_failed_commit
) {
2307 printk(KERN_CRIT
"EXT4-fs error (device %s): "
2308 "ext4_fill_super: Journal transaction "
2309 "%u is corrupt\n", sb
->s_id
,
2310 EXT4_SB(sb
)->s_journal
->j_failed_commit
);
2311 if (test_opt(sb
, ERRORS_RO
)) {
2313 "Mounting filesystem read-only\n");
2314 sb
->s_flags
|= MS_RDONLY
;
2315 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
2316 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
2318 if (test_opt(sb
, ERRORS_PANIC
)) {
2319 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
2320 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
2321 ext4_commit_super(sb
, es
, 1);
2323 "EXT4-fs (device %s): mount failed\n",
2328 } else if (journal_inum
) {
2329 if (ext4_create_journal(sb
, es
, journal_inum
))
2334 "ext4: No journal on filesystem on %s\n",
2339 if (ext4_blocks_count(es
) > 0xffffffffULL
&&
2340 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
2341 JBD2_FEATURE_INCOMPAT_64BIT
)) {
2342 printk(KERN_ERR
"ext4: Failed to set 64-bit journal feature\n");
2346 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
2347 jbd2_journal_set_features(sbi
->s_journal
,
2348 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2349 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2350 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
2351 jbd2_journal_set_features(sbi
->s_journal
,
2352 JBD2_FEATURE_COMPAT_CHECKSUM
, 0, 0);
2353 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
2354 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2356 jbd2_journal_clear_features(sbi
->s_journal
,
2357 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2358 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2361 /* We have now updated the journal if required, so we can
2362 * validate the data journaling mode. */
2363 switch (test_opt(sb
, DATA_FLAGS
)) {
2365 /* No mode set, assume a default based on the journal
2366 * capabilities: ORDERED_DATA if the journal can
2367 * cope, else JOURNAL_DATA
2369 if (jbd2_journal_check_available_features
2370 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
2371 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
2373 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
2376 case EXT4_MOUNT_ORDERED_DATA
:
2377 case EXT4_MOUNT_WRITEBACK_DATA
:
2378 if (!jbd2_journal_check_available_features
2379 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
2380 printk(KERN_ERR
"EXT4-fs: Journal does not support "
2381 "requested data journaling mode\n");
2388 if (test_opt(sb
, NOBH
)) {
2389 if (!(test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)) {
2390 printk(KERN_WARNING
"EXT4-fs: Ignoring nobh option - "
2391 "its supported only with writeback mode\n");
2392 clear_opt(sbi
->s_mount_opt
, NOBH
);
2396 * The jbd2_journal_load will have done any necessary log recovery,
2397 * so we can safely mount the rest of the filesystem now.
2400 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
2402 printk(KERN_ERR
"EXT4-fs: get root inode failed\n");
2403 ret
= PTR_ERR(root
);
2406 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
2408 printk(KERN_ERR
"EXT4-fs: corrupt root inode, run e2fsck\n");
2411 sb
->s_root
= d_alloc_root(root
);
2413 printk(KERN_ERR
"EXT4-fs: get root dentry failed\n");
2419 ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
);
2421 /* determine the minimum size of new large inodes, if present */
2422 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
2423 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2424 EXT4_GOOD_OLD_INODE_SIZE
;
2425 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2426 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
2427 if (sbi
->s_want_extra_isize
<
2428 le16_to_cpu(es
->s_want_extra_isize
))
2429 sbi
->s_want_extra_isize
=
2430 le16_to_cpu(es
->s_want_extra_isize
);
2431 if (sbi
->s_want_extra_isize
<
2432 le16_to_cpu(es
->s_min_extra_isize
))
2433 sbi
->s_want_extra_isize
=
2434 le16_to_cpu(es
->s_min_extra_isize
);
2437 /* Check if enough inode space is available */
2438 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
2439 sbi
->s_inode_size
) {
2440 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2441 EXT4_GOOD_OLD_INODE_SIZE
;
2442 printk(KERN_INFO
"EXT4-fs: required extra inode space not"
2447 * akpm: core read_super() calls in here with the superblock locked.
2448 * That deadlocks, because orphan cleanup needs to lock the superblock
2449 * in numerous places. Here we just pop the lock - it's relatively
2450 * harmless, because we are now ready to accept write_super() requests,
2451 * and aviro says that's the only reason for hanging onto the
2454 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
2455 ext4_orphan_cleanup(sb
, es
);
2456 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
2458 printk(KERN_INFO
"EXT4-fs: recovery complete.\n");
2459 ext4_mark_recovery_complete(sb
, es
);
2460 printk(KERN_INFO
"EXT4-fs: mounted filesystem with %s data mode.\n",
2461 test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
? "journal":
2462 test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
? "ordered":
2465 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
2466 printk(KERN_WARNING
"EXT4-fs: Ignoring delalloc option - "
2467 "requested data journaling mode\n");
2468 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
2469 } else if (test_opt(sb
, DELALLOC
))
2470 printk(KERN_INFO
"EXT4-fs: delayed allocation enabled\n");
2473 ext4_mb_init(sb
, needs_recovery
);
2480 printk(KERN_ERR
"VFS: Can't find ext4 filesystem on dev %s.\n",
2485 jbd2_journal_destroy(sbi
->s_journal
);
2486 sbi
->s_journal
= NULL
;
2488 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
2489 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
2490 percpu_counter_destroy(&sbi
->s_dirs_counter
);
2492 for (i
= 0; i
< db_count
; i
++)
2493 brelse(sbi
->s_group_desc
[i
]);
2494 kfree(sbi
->s_group_desc
);
2497 for (i
= 0; i
< MAXQUOTAS
; i
++)
2498 kfree(sbi
->s_qf_names
[i
]);
2500 ext4_blkdev_remove(sbi
);
2503 sb
->s_fs_info
= NULL
;
2510 * Setup any per-fs journal parameters now. We'll do this both on
2511 * initial mount, once the journal has been initialised but before we've
2512 * done any recovery; and again on any subsequent remount.
2514 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
2516 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2518 if (sbi
->s_commit_interval
)
2519 journal
->j_commit_interval
= sbi
->s_commit_interval
;
2520 /* We could also set up an ext4-specific default for the commit
2521 * interval here, but for now we'll just fall back to the jbd
2524 spin_lock(&journal
->j_state_lock
);
2525 if (test_opt(sb
, BARRIER
))
2526 journal
->j_flags
|= JBD2_BARRIER
;
2528 journal
->j_flags
&= ~JBD2_BARRIER
;
2529 spin_unlock(&journal
->j_state_lock
);
2532 static journal_t
*ext4_get_journal(struct super_block
*sb
,
2533 unsigned int journal_inum
)
2535 struct inode
*journal_inode
;
2538 /* First, test for the existence of a valid inode on disk. Bad
2539 * things happen if we iget() an unused inode, as the subsequent
2540 * iput() will try to delete it. */
2542 journal_inode
= ext4_iget(sb
, journal_inum
);
2543 if (IS_ERR(journal_inode
)) {
2544 printk(KERN_ERR
"EXT4-fs: no journal found.\n");
2547 if (!journal_inode
->i_nlink
) {
2548 make_bad_inode(journal_inode
);
2549 iput(journal_inode
);
2550 printk(KERN_ERR
"EXT4-fs: journal inode is deleted.\n");
2554 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2555 journal_inode
, journal_inode
->i_size
);
2556 if (!S_ISREG(journal_inode
->i_mode
)) {
2557 printk(KERN_ERR
"EXT4-fs: invalid journal inode.\n");
2558 iput(journal_inode
);
2562 journal
= jbd2_journal_init_inode(journal_inode
);
2564 printk(KERN_ERR
"EXT4-fs: Could not load journal inode\n");
2565 iput(journal_inode
);
2568 journal
->j_private
= sb
;
2569 ext4_init_journal_params(sb
, journal
);
2573 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
2576 struct buffer_head
*bh
;
2580 int hblock
, blocksize
;
2581 ext4_fsblk_t sb_block
;
2582 unsigned long offset
;
2583 struct ext4_super_block
*es
;
2584 struct block_device
*bdev
;
2586 bdev
= ext4_blkdev_get(j_dev
);
2590 if (bd_claim(bdev
, sb
)) {
2592 "EXT4: failed to claim external journal device.\n");
2597 blocksize
= sb
->s_blocksize
;
2598 hblock
= bdev_hardsect_size(bdev
);
2599 if (blocksize
< hblock
) {
2601 "EXT4-fs: blocksize too small for journal device.\n");
2605 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
2606 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
2607 set_blocksize(bdev
, blocksize
);
2608 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
2609 printk(KERN_ERR
"EXT4-fs: couldn't read superblock of "
2610 "external journal\n");
2614 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
2615 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
2616 !(le32_to_cpu(es
->s_feature_incompat
) &
2617 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
2618 printk(KERN_ERR
"EXT4-fs: external journal has "
2619 "bad superblock\n");
2624 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
2625 printk(KERN_ERR
"EXT4-fs: journal UUID does not match\n");
2630 len
= ext4_blocks_count(es
);
2631 start
= sb_block
+ 1;
2632 brelse(bh
); /* we're done with the superblock */
2634 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
2635 start
, len
, blocksize
);
2637 printk(KERN_ERR
"EXT4-fs: failed to create device journal\n");
2640 journal
->j_private
= sb
;
2641 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
2642 wait_on_buffer(journal
->j_sb_buffer
);
2643 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
2644 printk(KERN_ERR
"EXT4-fs: I/O error on journal device\n");
2647 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
2648 printk(KERN_ERR
"EXT4-fs: External journal has more than one "
2649 "user (unsupported) - %d\n",
2650 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
2653 EXT4_SB(sb
)->journal_bdev
= bdev
;
2654 ext4_init_journal_params(sb
, journal
);
2657 jbd2_journal_destroy(journal
);
2659 ext4_blkdev_put(bdev
);
2663 static int ext4_load_journal(struct super_block
*sb
,
2664 struct ext4_super_block
*es
,
2665 unsigned long journal_devnum
)
2668 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
2671 int really_read_only
;
2673 if (journal_devnum
&&
2674 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
2675 printk(KERN_INFO
"EXT4-fs: external journal device major/minor "
2676 "numbers have changed\n");
2677 journal_dev
= new_decode_dev(journal_devnum
);
2679 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
2681 really_read_only
= bdev_read_only(sb
->s_bdev
);
2684 * Are we loading a blank journal or performing recovery after a
2685 * crash? For recovery, we need to check in advance whether we
2686 * can get read-write access to the device.
2689 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
2690 if (sb
->s_flags
& MS_RDONLY
) {
2691 printk(KERN_INFO
"EXT4-fs: INFO: recovery "
2692 "required on readonly filesystem.\n");
2693 if (really_read_only
) {
2694 printk(KERN_ERR
"EXT4-fs: write access "
2695 "unavailable, cannot proceed.\n");
2698 printk(KERN_INFO
"EXT4-fs: write access will "
2699 "be enabled during recovery.\n");
2703 if (journal_inum
&& journal_dev
) {
2704 printk(KERN_ERR
"EXT4-fs: filesystem has both journal "
2705 "and inode journals!\n");
2710 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
2713 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
2717 if (!really_read_only
&& test_opt(sb
, UPDATE_JOURNAL
)) {
2718 err
= jbd2_journal_update_format(journal
);
2720 printk(KERN_ERR
"EXT4-fs: error updating journal.\n");
2721 jbd2_journal_destroy(journal
);
2726 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
2727 err
= jbd2_journal_wipe(journal
, !really_read_only
);
2729 err
= jbd2_journal_load(journal
);
2732 printk(KERN_ERR
"EXT4-fs: error loading journal.\n");
2733 jbd2_journal_destroy(journal
);
2737 EXT4_SB(sb
)->s_journal
= journal
;
2738 ext4_clear_journal_err(sb
, es
);
2740 if (journal_devnum
&&
2741 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
2742 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
2745 /* Make sure we flush the recovery flag to disk. */
2746 ext4_commit_super(sb
, es
, 1);
2752 static int ext4_create_journal(struct super_block
*sb
,
2753 struct ext4_super_block
*es
,
2754 unsigned int journal_inum
)
2759 if (sb
->s_flags
& MS_RDONLY
) {
2760 printk(KERN_ERR
"EXT4-fs: readonly filesystem when trying to "
2761 "create journal.\n");
2765 journal
= ext4_get_journal(sb
, journal_inum
);
2769 printk(KERN_INFO
"EXT4-fs: creating new journal on inode %u\n",
2772 err
= jbd2_journal_create(journal
);
2774 printk(KERN_ERR
"EXT4-fs: error creating journal.\n");
2775 jbd2_journal_destroy(journal
);
2779 EXT4_SB(sb
)->s_journal
= journal
;
2781 ext4_update_dynamic_rev(sb
);
2782 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
2783 EXT4_SET_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
);
2785 es
->s_journal_inum
= cpu_to_le32(journal_inum
);
2788 /* Make sure we flush the recovery flag to disk. */
2789 ext4_commit_super(sb
, es
, 1);
2794 static void ext4_commit_super(struct super_block
*sb
,
2795 struct ext4_super_block
*es
, int sync
)
2797 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
2801 es
->s_wtime
= cpu_to_le32(get_seconds());
2802 ext4_free_blocks_count_set(es
, ext4_count_free_blocks(sb
));
2803 es
->s_free_inodes_count
= cpu_to_le32(ext4_count_free_inodes(sb
));
2804 BUFFER_TRACE(sbh
, "marking dirty");
2805 mark_buffer_dirty(sbh
);
2807 sync_dirty_buffer(sbh
);
2812 * Have we just finished recovery? If so, and if we are mounting (or
2813 * remounting) the filesystem readonly, then we will end up with a
2814 * consistent fs on disk. Record that fact.
2816 static void ext4_mark_recovery_complete(struct super_block
*sb
,
2817 struct ext4_super_block
*es
)
2819 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
2821 jbd2_journal_lock_updates(journal
);
2822 jbd2_journal_flush(journal
);
2824 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
2825 sb
->s_flags
& MS_RDONLY
) {
2826 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
2828 ext4_commit_super(sb
, es
, 1);
2831 jbd2_journal_unlock_updates(journal
);
2835 * If we are mounting (or read-write remounting) a filesystem whose journal
2836 * has recorded an error from a previous lifetime, move that error to the
2837 * main filesystem now.
2839 static void ext4_clear_journal_err(struct super_block
*sb
,
2840 struct ext4_super_block
*es
)
2846 journal
= EXT4_SB(sb
)->s_journal
;
2849 * Now check for any error status which may have been recorded in the
2850 * journal by a prior ext4_error() or ext4_abort()
2853 j_errno
= jbd2_journal_errno(journal
);
2857 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
2858 ext4_warning(sb
, __func__
, "Filesystem error recorded "
2859 "from previous mount: %s", errstr
);
2860 ext4_warning(sb
, __func__
, "Marking fs in need of "
2861 "filesystem check.");
2863 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
2864 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
2865 ext4_commit_super(sb
, es
, 1);
2867 jbd2_journal_clear_err(journal
);
2872 * Force the running and committing transactions to commit,
2873 * and wait on the commit.
2875 int ext4_force_commit(struct super_block
*sb
)
2880 if (sb
->s_flags
& MS_RDONLY
)
2883 journal
= EXT4_SB(sb
)->s_journal
;
2885 ret
= ext4_journal_force_commit(journal
);
2890 * Ext4 always journals updates to the superblock itself, so we don't
2891 * have to propagate any other updates to the superblock on disk at this
2892 * point. Just start an async writeback to get the buffers on their way
2895 * This implicitly triggers the writebehind on sync().
2898 static void ext4_write_super(struct super_block
*sb
)
2900 if (mutex_trylock(&sb
->s_lock
) != 0)
2905 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
2910 if (jbd2_journal_start_commit(EXT4_SB(sb
)->s_journal
, &target
)) {
2912 jbd2_log_wait_commit(EXT4_SB(sb
)->s_journal
, target
);
2918 * LVM calls this function before a (read-only) snapshot is created. This
2919 * gives us a chance to flush the journal completely and mark the fs clean.
2921 static void ext4_write_super_lockfs(struct super_block
*sb
)
2925 if (!(sb
->s_flags
& MS_RDONLY
)) {
2926 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
2928 /* Now we set up the journal barrier. */
2929 jbd2_journal_lock_updates(journal
);
2930 jbd2_journal_flush(journal
);
2932 /* Journal blocked and flushed, clear needs_recovery flag. */
2933 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
2934 ext4_commit_super(sb
, EXT4_SB(sb
)->s_es
, 1);
2939 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2940 * flag here, even though the filesystem is not technically dirty yet.
2942 static void ext4_unlockfs(struct super_block
*sb
)
2944 if (!(sb
->s_flags
& MS_RDONLY
)) {
2946 /* Reser the needs_recovery flag before the fs is unlocked. */
2947 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
2948 ext4_commit_super(sb
, EXT4_SB(sb
)->s_es
, 1);
2950 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
2954 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
2956 struct ext4_super_block
*es
;
2957 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2958 ext4_fsblk_t n_blocks_count
= 0;
2959 unsigned long old_sb_flags
;
2960 struct ext4_mount_options old_opts
;
2967 /* Store the original options */
2968 old_sb_flags
= sb
->s_flags
;
2969 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
2970 old_opts
.s_resuid
= sbi
->s_resuid
;
2971 old_opts
.s_resgid
= sbi
->s_resgid
;
2972 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
2974 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
2975 for (i
= 0; i
< MAXQUOTAS
; i
++)
2976 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
2980 * Allow the "check" option to be passed as a remount option.
2982 if (!parse_options(data
, sb
, NULL
, NULL
, &n_blocks_count
, 1)) {
2987 if (sbi
->s_mount_opt
& EXT4_MOUNT_ABORT
)
2988 ext4_abort(sb
, __func__
, "Abort forced by user");
2990 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
2991 ((sbi
->s_mount_opt
& EXT4_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
2995 ext4_init_journal_params(sb
, sbi
->s_journal
);
2997 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
) ||
2998 n_blocks_count
> ext4_blocks_count(es
)) {
2999 if (sbi
->s_mount_opt
& EXT4_MOUNT_ABORT
) {
3004 if (*flags
& MS_RDONLY
) {
3006 * First of all, the unconditional stuff we have to do
3007 * to disable replay of the journal when we next remount
3009 sb
->s_flags
|= MS_RDONLY
;
3012 * OK, test if we are remounting a valid rw partition
3013 * readonly, and if so set the rdonly flag and then
3014 * mark the partition as valid again.
3016 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
3017 (sbi
->s_mount_state
& EXT4_VALID_FS
))
3018 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
3021 * We have to unlock super so that we can wait for
3025 ext4_mark_recovery_complete(sb
, es
);
3029 if ((ret
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3030 ~EXT4_FEATURE_RO_COMPAT_SUPP
))) {
3031 printk(KERN_WARNING
"EXT4-fs: %s: couldn't "
3032 "remount RDWR because of unsupported "
3033 "optional features (%x).\n",
3034 sb
->s_id
, le32_to_cpu(ret
));
3040 * Make sure the group descriptor checksums
3041 * are sane. If they aren't, refuse to
3044 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
3045 struct ext4_group_desc
*gdp
=
3046 ext4_get_group_desc(sb
, g
, NULL
);
3048 if (!ext4_group_desc_csum_verify(sbi
, g
, gdp
)) {
3050 "EXT4-fs: ext4_remount: "
3051 "Checksum for group %lu failed (%u!=%u)\n",
3052 g
, le16_to_cpu(ext4_group_desc_csum(sbi
, g
, gdp
)),
3053 le16_to_cpu(gdp
->bg_checksum
));
3060 * If we have an unprocessed orphan list hanging
3061 * around from a previously readonly bdev mount,
3062 * require a full umount/remount for now.
3064 if (es
->s_last_orphan
) {
3065 printk(KERN_WARNING
"EXT4-fs: %s: couldn't "
3066 "remount RDWR because of unprocessed "
3067 "orphan inode list. Please "
3068 "umount/remount instead.\n",
3075 * Mounting a RDONLY partition read-write, so reread
3076 * and store the current valid flag. (It may have
3077 * been changed by e2fsck since we originally mounted
3080 ext4_clear_journal_err(sb
, es
);
3081 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3082 if ((err
= ext4_group_extend(sb
, es
, n_blocks_count
)))
3084 if (!ext4_setup_super(sb
, es
, 0))
3085 sb
->s_flags
&= ~MS_RDONLY
;
3089 /* Release old quota file names */
3090 for (i
= 0; i
< MAXQUOTAS
; i
++)
3091 if (old_opts
.s_qf_names
[i
] &&
3092 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3093 kfree(old_opts
.s_qf_names
[i
]);
3097 sb
->s_flags
= old_sb_flags
;
3098 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
3099 sbi
->s_resuid
= old_opts
.s_resuid
;
3100 sbi
->s_resgid
= old_opts
.s_resgid
;
3101 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
3103 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
3104 for (i
= 0; i
< MAXQUOTAS
; i
++) {
3105 if (sbi
->s_qf_names
[i
] &&
3106 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
3107 kfree(sbi
->s_qf_names
[i
]);
3108 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
3114 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
3116 struct super_block
*sb
= dentry
->d_sb
;
3117 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3118 struct ext4_super_block
*es
= sbi
->s_es
;
3121 if (test_opt(sb
, MINIX_DF
)) {
3122 sbi
->s_overhead_last
= 0;
3123 } else if (sbi
->s_blocks_last
!= ext4_blocks_count(es
)) {
3124 ext4_group_t ngroups
= sbi
->s_groups_count
, i
;
3125 ext4_fsblk_t overhead
= 0;
3129 * Compute the overhead (FS structures). This is constant
3130 * for a given filesystem unless the number of block groups
3131 * changes so we cache the previous value until it does.
3135 * All of the blocks before first_data_block are
3138 overhead
= le32_to_cpu(es
->s_first_data_block
);
3141 * Add the overhead attributed to the superblock and
3142 * block group descriptors. If the sparse superblocks
3143 * feature is turned on, then not all groups have this.
3145 for (i
= 0; i
< ngroups
; i
++) {
3146 overhead
+= ext4_bg_has_super(sb
, i
) +
3147 ext4_bg_num_gdb(sb
, i
);
3152 * Every block group has an inode bitmap, a block
3153 * bitmap, and an inode table.
3155 overhead
+= ngroups
* (2 + sbi
->s_itb_per_group
);
3156 sbi
->s_overhead_last
= overhead
;
3158 sbi
->s_blocks_last
= ext4_blocks_count(es
);
3161 buf
->f_type
= EXT4_SUPER_MAGIC
;
3162 buf
->f_bsize
= sb
->s_blocksize
;
3163 buf
->f_blocks
= ext4_blocks_count(es
) - sbi
->s_overhead_last
;
3164 buf
->f_bfree
= percpu_counter_sum_positive(&sbi
->s_freeblocks_counter
);
3165 ext4_free_blocks_count_set(es
, buf
->f_bfree
);
3166 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
3167 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
3169 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
3170 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
3171 es
->s_free_inodes_count
= cpu_to_le32(buf
->f_ffree
);
3172 buf
->f_namelen
= EXT4_NAME_LEN
;
3173 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
3174 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
3175 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
3176 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
3180 /* Helper function for writing quotas on sync - we need to start transaction before quota file
3181 * is locked for write. Otherwise the are possible deadlocks:
3182 * Process 1 Process 2
3183 * ext4_create() quota_sync()
3184 * jbd2_journal_start() write_dquot()
3185 * DQUOT_INIT() down(dqio_mutex)
3186 * down(dqio_mutex) jbd2_journal_start()
3192 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
3194 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_type
];
3197 static int ext4_dquot_initialize(struct inode
*inode
, int type
)
3202 /* We may create quota structure so we need to reserve enough blocks */
3203 handle
= ext4_journal_start(inode
, 2*EXT4_QUOTA_INIT_BLOCKS(inode
->i_sb
));
3205 return PTR_ERR(handle
);
3206 ret
= dquot_initialize(inode
, type
);
3207 err
= ext4_journal_stop(handle
);
3213 static int ext4_dquot_drop(struct inode
*inode
)
3218 /* We may delete quota structure so we need to reserve enough blocks */
3219 handle
= ext4_journal_start(inode
, 2*EXT4_QUOTA_DEL_BLOCKS(inode
->i_sb
));
3220 if (IS_ERR(handle
)) {
3222 * We call dquot_drop() anyway to at least release references
3223 * to quota structures so that umount does not hang.
3226 return PTR_ERR(handle
);
3228 ret
= dquot_drop(inode
);
3229 err
= ext4_journal_stop(handle
);
3235 static int ext4_write_dquot(struct dquot
*dquot
)
3239 struct inode
*inode
;
3241 inode
= dquot_to_inode(dquot
);
3242 handle
= ext4_journal_start(inode
,
3243 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
3245 return PTR_ERR(handle
);
3246 ret
= dquot_commit(dquot
);
3247 err
= ext4_journal_stop(handle
);
3253 static int ext4_acquire_dquot(struct dquot
*dquot
)
3258 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3259 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
3261 return PTR_ERR(handle
);
3262 ret
= dquot_acquire(dquot
);
3263 err
= ext4_journal_stop(handle
);
3269 static int ext4_release_dquot(struct dquot
*dquot
)
3274 handle
= ext4_journal_start(dquot_to_inode(dquot
),
3275 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
3276 if (IS_ERR(handle
)) {
3277 /* Release dquot anyway to avoid endless cycle in dqput() */
3278 dquot_release(dquot
);
3279 return PTR_ERR(handle
);
3281 ret
= dquot_release(dquot
);
3282 err
= ext4_journal_stop(handle
);
3288 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
3290 /* Are we journaling quotas? */
3291 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
3292 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
3293 dquot_mark_dquot_dirty(dquot
);
3294 return ext4_write_dquot(dquot
);
3296 return dquot_mark_dquot_dirty(dquot
);
3300 static int ext4_write_info(struct super_block
*sb
, int type
)
3305 /* Data block + inode block */
3306 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
3308 return PTR_ERR(handle
);
3309 ret
= dquot_commit_info(sb
, type
);
3310 err
= ext4_journal_stop(handle
);
3317 * Turn on quotas during mount time - we need to find
3318 * the quota file and such...
3320 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
3322 return vfs_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
3323 EXT4_SB(sb
)->s_jquota_fmt
, type
);
3327 * Standard function to be called on quota_on
3329 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
3330 char *path
, int remount
)
3333 struct nameidata nd
;
3335 if (!test_opt(sb
, QUOTA
))
3337 /* When remounting, no checks are needed and in fact, path is NULL */
3339 return vfs_quota_on(sb
, type
, format_id
, path
, remount
);
3341 err
= path_lookup(path
, LOOKUP_FOLLOW
, &nd
);
3345 /* Quotafile not on the same filesystem? */
3346 if (nd
.path
.mnt
->mnt_sb
!= sb
) {
3350 /* Journaling quota? */
3351 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
3352 /* Quotafile not in fs root? */
3353 if (nd
.path
.dentry
->d_parent
->d_inode
!= sb
->s_root
->d_inode
)
3355 "EXT4-fs: Quota file not on filesystem root. "
3356 "Journaled quota will not work.\n");
3360 * When we journal data on quota file, we have to flush journal to see
3361 * all updates to the file when we bypass pagecache...
3363 if (ext4_should_journal_data(nd
.path
.dentry
->d_inode
)) {
3365 * We don't need to lock updates but journal_flush() could
3366 * otherwise be livelocked...
3368 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
3369 jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
3370 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
3373 err
= vfs_quota_on_path(sb
, type
, format_id
, &nd
.path
);
3378 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3379 * acquiring the locks... As quota files are never truncated and quota code
3380 * itself serializes the operations (and noone else should touch the files)
3381 * we don't have to be afraid of races */
3382 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
3383 size_t len
, loff_t off
)
3385 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
3386 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
3388 int offset
= off
& (sb
->s_blocksize
- 1);
3391 struct buffer_head
*bh
;
3392 loff_t i_size
= i_size_read(inode
);
3396 if (off
+len
> i_size
)
3399 while (toread
> 0) {
3400 tocopy
= sb
->s_blocksize
- offset
< toread
?
3401 sb
->s_blocksize
- offset
: toread
;
3402 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
3405 if (!bh
) /* A hole? */
3406 memset(data
, 0, tocopy
);
3408 memcpy(data
, bh
->b_data
+offset
, tocopy
);
3418 /* Write to quotafile (we know the transaction is already started and has
3419 * enough credits) */
3420 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
3421 const char *data
, size_t len
, loff_t off
)
3423 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
3424 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
3426 int offset
= off
& (sb
->s_blocksize
- 1);
3428 int journal_quota
= EXT4_SB(sb
)->s_qf_names
[type
] != NULL
;
3429 size_t towrite
= len
;
3430 struct buffer_head
*bh
;
3431 handle_t
*handle
= journal_current_handle();
3434 printk(KERN_WARNING
"EXT4-fs: Quota write (off=%Lu, len=%Lu)"
3435 " cancelled because transaction is not started.\n",
3436 (unsigned long long)off
, (unsigned long long)len
);
3439 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
3440 while (towrite
> 0) {
3441 tocopy
= sb
->s_blocksize
- offset
< towrite
?
3442 sb
->s_blocksize
- offset
: towrite
;
3443 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
3446 if (journal_quota
) {
3447 err
= ext4_journal_get_write_access(handle
, bh
);
3454 memcpy(bh
->b_data
+offset
, data
, tocopy
);
3455 flush_dcache_page(bh
->b_page
);
3458 err
= ext4_journal_dirty_metadata(handle
, bh
);
3460 /* Always do at least ordered writes for quotas */
3461 err
= ext4_jbd2_file_inode(handle
, inode
);
3462 mark_buffer_dirty(bh
);
3473 if (len
== towrite
) {
3474 mutex_unlock(&inode
->i_mutex
);
3477 if (inode
->i_size
< off
+len
-towrite
) {
3478 i_size_write(inode
, off
+len
-towrite
);
3479 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
3481 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
3482 ext4_mark_inode_dirty(handle
, inode
);
3483 mutex_unlock(&inode
->i_mutex
);
3484 return len
- towrite
;
3489 static int ext4_get_sb(struct file_system_type
*fs_type
,
3490 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
3492 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
, mnt
);
3495 static struct file_system_type ext4dev_fs_type
= {
3496 .owner
= THIS_MODULE
,
3498 .get_sb
= ext4_get_sb
,
3499 .kill_sb
= kill_block_super
,
3500 .fs_flags
= FS_REQUIRES_DEV
,
3503 static int __init
init_ext4_fs(void)
3507 err
= init_ext4_mballoc();
3511 err
= init_ext4_xattr();
3514 err
= init_inodecache();
3517 err
= register_filesystem(&ext4dev_fs_type
);
3522 destroy_inodecache();
3526 exit_ext4_mballoc();
3530 static void __exit
exit_ext4_fs(void)
3532 unregister_filesystem(&ext4dev_fs_type
);
3533 destroy_inodecache();
3535 exit_ext4_mballoc();
3538 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3539 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
3540 MODULE_LICENSE("GPL");
3541 module_init(init_ext4_fs
)
3542 module_exit(exit_ext4_fs
)