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/ext4_fs.h>
25 #include <linux/ext4_jbd2.h>
26 #include <linux/slab.h>
27 #include <linux/init.h>
28 #include <linux/blkdev.h>
29 #include <linux/parser.h>
30 #include <linux/smp_lock.h>
31 #include <linux/buffer_head.h>
32 #include <linux/exportfs.h>
33 #include <linux/vfs.h>
34 #include <linux/random.h>
35 #include <linux/mount.h>
36 #include <linux/namei.h>
37 #include <linux/quotaops.h>
38 #include <linux/seq_file.h>
39 #include <linux/log2.h>
40 #include <linux/crc16.h>
42 #include <asm/uaccess.h>
49 static int ext4_load_journal(struct super_block
*, struct ext4_super_block
*,
50 unsigned long journal_devnum
);
51 static int ext4_create_journal(struct super_block
*, struct ext4_super_block
*,
53 static void ext4_commit_super (struct super_block
* sb
,
54 struct ext4_super_block
* es
,
56 static void ext4_mark_recovery_complete(struct super_block
* sb
,
57 struct ext4_super_block
* es
);
58 static void ext4_clear_journal_err(struct super_block
* sb
,
59 struct ext4_super_block
* es
);
60 static int ext4_sync_fs(struct super_block
*sb
, int wait
);
61 static const char *ext4_decode_error(struct super_block
* sb
, int errno
,
63 static int ext4_remount (struct super_block
* sb
, int * flags
, char * data
);
64 static int ext4_statfs (struct dentry
* dentry
, struct kstatfs
* buf
);
65 static void ext4_unlockfs(struct super_block
*sb
);
66 static void ext4_write_super (struct super_block
* sb
);
67 static void ext4_write_super_lockfs(struct super_block
*sb
);
70 ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
71 struct ext4_group_desc
*bg
)
73 return le32_to_cpu(bg
->bg_block_bitmap_lo
) |
74 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
75 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
78 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
79 struct ext4_group_desc
*bg
)
81 return le32_to_cpu(bg
->bg_inode_bitmap_lo
) |
82 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
83 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
86 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
87 struct ext4_group_desc
*bg
)
89 return le32_to_cpu(bg
->bg_inode_table_lo
) |
90 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
91 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
94 void ext4_block_bitmap_set(struct super_block
*sb
,
95 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
97 bg
->bg_block_bitmap_lo
= cpu_to_le32((u32
)blk
);
98 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
99 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
102 void ext4_inode_bitmap_set(struct super_block
*sb
,
103 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
105 bg
->bg_inode_bitmap_lo
= cpu_to_le32((u32
)blk
);
106 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
107 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
110 void ext4_inode_table_set(struct super_block
*sb
,
111 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
113 bg
->bg_inode_table_lo
= cpu_to_le32((u32
)blk
);
114 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
115 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
119 * Wrappers for jbd2_journal_start/end.
121 * The only special thing we need to do here is to make sure that all
122 * journal_end calls result in the superblock being marked dirty, so
123 * that sync() will call the filesystem's write_super callback if
126 handle_t
*ext4_journal_start_sb(struct super_block
*sb
, int nblocks
)
130 if (sb
->s_flags
& MS_RDONLY
)
131 return ERR_PTR(-EROFS
);
133 /* Special case here: if the journal has aborted behind our
134 * backs (eg. EIO in the commit thread), then we still need to
135 * take the FS itself readonly cleanly. */
136 journal
= EXT4_SB(sb
)->s_journal
;
137 if (is_journal_aborted(journal
)) {
138 ext4_abort(sb
, __FUNCTION__
,
139 "Detected aborted journal");
140 return ERR_PTR(-EROFS
);
143 return jbd2_journal_start(journal
, nblocks
);
147 * The only special thing we need to do here is to make sure that all
148 * jbd2_journal_stop calls result in the superblock being marked dirty, so
149 * that sync() will call the filesystem's write_super callback if
152 int __ext4_journal_stop(const char *where
, handle_t
*handle
)
154 struct super_block
*sb
;
158 sb
= handle
->h_transaction
->t_journal
->j_private
;
160 rc
= jbd2_journal_stop(handle
);
165 __ext4_std_error(sb
, where
, err
);
169 void ext4_journal_abort_handle(const char *caller
, const char *err_fn
,
170 struct buffer_head
*bh
, handle_t
*handle
, int err
)
173 const char *errstr
= ext4_decode_error(NULL
, err
, nbuf
);
176 BUFFER_TRACE(bh
, "abort");
181 if (is_handle_aborted(handle
))
184 printk(KERN_ERR
"%s: aborting transaction: %s in %s\n",
185 caller
, errstr
, err_fn
);
187 jbd2_journal_abort_handle(handle
);
190 /* Deal with the reporting of failure conditions on a filesystem such as
191 * inconsistencies detected or read IO failures.
193 * On ext2, we can store the error state of the filesystem in the
194 * superblock. That is not possible on ext4, because we may have other
195 * write ordering constraints on the superblock which prevent us from
196 * writing it out straight away; and given that the journal is about to
197 * be aborted, we can't rely on the current, or future, transactions to
198 * write out the superblock safely.
200 * We'll just use the jbd2_journal_abort() error code to record an error in
201 * the journal instead. On recovery, the journal will compain about
202 * that error until we've noted it down and cleared it.
205 static void ext4_handle_error(struct super_block
*sb
)
207 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
209 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
210 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
212 if (sb
->s_flags
& MS_RDONLY
)
215 if (!test_opt (sb
, ERRORS_CONT
)) {
216 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
218 EXT4_SB(sb
)->s_mount_opt
|= EXT4_MOUNT_ABORT
;
220 jbd2_journal_abort(journal
, -EIO
);
222 if (test_opt (sb
, ERRORS_RO
)) {
223 printk (KERN_CRIT
"Remounting filesystem read-only\n");
224 sb
->s_flags
|= MS_RDONLY
;
226 ext4_commit_super(sb
, es
, 1);
227 if (test_opt(sb
, ERRORS_PANIC
))
228 panic("EXT4-fs (device %s): panic forced after error\n",
232 void ext4_error (struct super_block
* sb
, const char * function
,
233 const char * fmt
, ...)
238 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ",sb
->s_id
, function
);
243 ext4_handle_error(sb
);
246 static const char *ext4_decode_error(struct super_block
* sb
, int errno
,
253 errstr
= "IO failure";
256 errstr
= "Out of memory";
259 if (!sb
|| EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
)
260 errstr
= "Journal has aborted";
262 errstr
= "Readonly filesystem";
265 /* If the caller passed in an extra buffer for unknown
266 * errors, textualise them now. Else we just return
269 /* Check for truncated error codes... */
270 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
279 /* __ext4_std_error decodes expected errors from journaling functions
280 * automatically and invokes the appropriate error response. */
282 void __ext4_std_error (struct super_block
* sb
, const char * function
,
288 /* Special case: if the error is EROFS, and we're not already
289 * inside a transaction, then there's really no point in logging
291 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
292 (sb
->s_flags
& MS_RDONLY
))
295 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
296 printk (KERN_CRIT
"EXT4-fs error (device %s) in %s: %s\n",
297 sb
->s_id
, function
, errstr
);
299 ext4_handle_error(sb
);
303 * ext4_abort is a much stronger failure handler than ext4_error. The
304 * abort function may be used to deal with unrecoverable failures such
305 * as journal IO errors or ENOMEM at a critical moment in log management.
307 * We unconditionally force the filesystem into an ABORT|READONLY state,
308 * unless the error response on the fs has been set to panic in which
309 * case we take the easy way out and panic immediately.
312 void ext4_abort (struct super_block
* sb
, const char * function
,
313 const char * fmt
, ...)
317 printk (KERN_CRIT
"ext4_abort called.\n");
320 printk(KERN_CRIT
"EXT4-fs error (device %s): %s: ",sb
->s_id
, function
);
325 if (test_opt(sb
, ERRORS_PANIC
))
326 panic("EXT4-fs panic from previous error\n");
328 if (sb
->s_flags
& MS_RDONLY
)
331 printk(KERN_CRIT
"Remounting filesystem read-only\n");
332 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
333 sb
->s_flags
|= MS_RDONLY
;
334 EXT4_SB(sb
)->s_mount_opt
|= EXT4_MOUNT_ABORT
;
335 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
338 void ext4_warning (struct super_block
* sb
, const char * function
,
339 const char * fmt
, ...)
344 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s: ",
351 void ext4_update_dynamic_rev(struct super_block
*sb
)
353 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
355 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
358 ext4_warning(sb
, __FUNCTION__
,
359 "updating to rev %d because of new feature flag, "
360 "running e2fsck is recommended",
363 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
364 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
365 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
366 /* leave es->s_feature_*compat flags alone */
367 /* es->s_uuid will be set by e2fsck if empty */
370 * The rest of the superblock fields should be zero, and if not it
371 * means they are likely already in use, so leave them alone. We
372 * can leave it up to e2fsck to clean up any inconsistencies there.
377 * Open the external journal device
379 static struct block_device
*ext4_blkdev_get(dev_t dev
)
381 struct block_device
*bdev
;
382 char b
[BDEVNAME_SIZE
];
384 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
390 printk(KERN_ERR
"EXT4: failed to open journal device %s: %ld\n",
391 __bdevname(dev
, b
), PTR_ERR(bdev
));
396 * Release the journal device
398 static int ext4_blkdev_put(struct block_device
*bdev
)
401 return blkdev_put(bdev
);
404 static int ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
406 struct block_device
*bdev
;
409 bdev
= sbi
->journal_bdev
;
411 ret
= ext4_blkdev_put(bdev
);
412 sbi
->journal_bdev
= NULL
;
417 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
419 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
422 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
426 printk(KERN_ERR
"sb orphan head is %d\n",
427 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
429 printk(KERN_ERR
"sb_info orphan list:\n");
430 list_for_each(l
, &sbi
->s_orphan
) {
431 struct inode
*inode
= orphan_list_entry(l
);
433 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
434 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
435 inode
->i_mode
, inode
->i_nlink
,
440 static void ext4_put_super (struct super_block
* sb
)
442 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
443 struct ext4_super_block
*es
= sbi
->s_es
;
446 ext4_ext_release(sb
);
447 ext4_xattr_put_super(sb
);
448 jbd2_journal_destroy(sbi
->s_journal
);
449 if (!(sb
->s_flags
& MS_RDONLY
)) {
450 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
451 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
452 BUFFER_TRACE(sbi
->s_sbh
, "marking dirty");
453 mark_buffer_dirty(sbi
->s_sbh
);
454 ext4_commit_super(sb
, es
, 1);
457 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
458 brelse(sbi
->s_group_desc
[i
]);
459 kfree(sbi
->s_group_desc
);
460 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
461 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
462 percpu_counter_destroy(&sbi
->s_dirs_counter
);
465 for (i
= 0; i
< MAXQUOTAS
; i
++)
466 kfree(sbi
->s_qf_names
[i
]);
469 /* Debugging code just in case the in-memory inode orphan list
470 * isn't empty. The on-disk one can be non-empty if we've
471 * detected an error and taken the fs readonly, but the
472 * in-memory list had better be clean by this point. */
473 if (!list_empty(&sbi
->s_orphan
))
474 dump_orphan_list(sb
, sbi
);
475 J_ASSERT(list_empty(&sbi
->s_orphan
));
477 invalidate_bdev(sb
->s_bdev
);
478 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
480 * Invalidate the journal device's buffers. We don't want them
481 * floating about in memory - the physical journal device may
482 * hotswapped, and it breaks the `ro-after' testing code.
484 sync_blockdev(sbi
->journal_bdev
);
485 invalidate_bdev(sbi
->journal_bdev
);
486 ext4_blkdev_remove(sbi
);
488 sb
->s_fs_info
= NULL
;
493 static struct kmem_cache
*ext4_inode_cachep
;
496 * Called inside transaction, so use GFP_NOFS
498 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
500 struct ext4_inode_info
*ei
;
502 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
505 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
506 ei
->i_acl
= EXT4_ACL_NOT_CACHED
;
507 ei
->i_default_acl
= EXT4_ACL_NOT_CACHED
;
509 ei
->i_block_alloc_info
= NULL
;
510 ei
->vfs_inode
.i_version
= 1;
511 memset(&ei
->i_cached_extent
, 0, sizeof(struct ext4_ext_cache
));
512 return &ei
->vfs_inode
;
515 static void ext4_destroy_inode(struct inode
*inode
)
517 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
518 printk("EXT4 Inode %p: orphan list check failed!\n",
520 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
521 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
525 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
528 static void init_once(struct kmem_cache
*cachep
, void *foo
)
530 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
532 INIT_LIST_HEAD(&ei
->i_orphan
);
533 #ifdef CONFIG_EXT4DEV_FS_XATTR
534 init_rwsem(&ei
->xattr_sem
);
536 mutex_init(&ei
->truncate_mutex
);
537 inode_init_once(&ei
->vfs_inode
);
540 static int init_inodecache(void)
542 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
543 sizeof(struct ext4_inode_info
),
544 0, (SLAB_RECLAIM_ACCOUNT
|
547 if (ext4_inode_cachep
== NULL
)
552 static void destroy_inodecache(void)
554 kmem_cache_destroy(ext4_inode_cachep
);
557 static void ext4_clear_inode(struct inode
*inode
)
559 struct ext4_block_alloc_info
*rsv
= EXT4_I(inode
)->i_block_alloc_info
;
560 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
561 if (EXT4_I(inode
)->i_acl
&&
562 EXT4_I(inode
)->i_acl
!= EXT4_ACL_NOT_CACHED
) {
563 posix_acl_release(EXT4_I(inode
)->i_acl
);
564 EXT4_I(inode
)->i_acl
= EXT4_ACL_NOT_CACHED
;
566 if (EXT4_I(inode
)->i_default_acl
&&
567 EXT4_I(inode
)->i_default_acl
!= EXT4_ACL_NOT_CACHED
) {
568 posix_acl_release(EXT4_I(inode
)->i_default_acl
);
569 EXT4_I(inode
)->i_default_acl
= EXT4_ACL_NOT_CACHED
;
572 ext4_discard_reservation(inode
);
573 EXT4_I(inode
)->i_block_alloc_info
= NULL
;
578 static inline void ext4_show_quota_options(struct seq_file
*seq
, struct super_block
*sb
)
580 #if defined(CONFIG_QUOTA)
581 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
583 if (sbi
->s_jquota_fmt
)
584 seq_printf(seq
, ",jqfmt=%s",
585 (sbi
->s_jquota_fmt
== QFMT_VFS_OLD
) ? "vfsold": "vfsv0");
587 if (sbi
->s_qf_names
[USRQUOTA
])
588 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
590 if (sbi
->s_qf_names
[GRPQUOTA
])
591 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
593 if (sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
)
594 seq_puts(seq
, ",usrquota");
596 if (sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
)
597 seq_puts(seq
, ",grpquota");
603 * - it's set to a non-default value OR
604 * - if the per-sb default is different from the global default
606 static int ext4_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
608 struct super_block
*sb
= vfs
->mnt_sb
;
609 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
610 struct ext4_super_block
*es
= sbi
->s_es
;
611 unsigned long def_mount_opts
;
613 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
615 if (sbi
->s_sb_block
!= 1)
616 seq_printf(seq
, ",sb=%llu", sbi
->s_sb_block
);
617 if (test_opt(sb
, MINIX_DF
))
618 seq_puts(seq
, ",minixdf");
619 if (test_opt(sb
, GRPID
))
620 seq_puts(seq
, ",grpid");
621 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
622 seq_puts(seq
, ",nogrpid");
623 if (sbi
->s_resuid
!= EXT4_DEF_RESUID
||
624 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
) {
625 seq_printf(seq
, ",resuid=%u", sbi
->s_resuid
);
627 if (sbi
->s_resgid
!= EXT4_DEF_RESGID
||
628 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
) {
629 seq_printf(seq
, ",resgid=%u", sbi
->s_resgid
);
631 if (test_opt(sb
, ERRORS_CONT
)) {
632 int def_errors
= le16_to_cpu(es
->s_errors
);
634 if (def_errors
== EXT4_ERRORS_PANIC
||
635 def_errors
== EXT4_ERRORS_RO
) {
636 seq_puts(seq
, ",errors=continue");
639 if (test_opt(sb
, ERRORS_RO
))
640 seq_puts(seq
, ",errors=remount-ro");
641 if (test_opt(sb
, ERRORS_PANIC
))
642 seq_puts(seq
, ",errors=panic");
643 if (test_opt(sb
, NO_UID32
))
644 seq_puts(seq
, ",nouid32");
645 if (test_opt(sb
, DEBUG
))
646 seq_puts(seq
, ",debug");
647 if (test_opt(sb
, OLDALLOC
))
648 seq_puts(seq
, ",oldalloc");
649 #ifdef CONFIG_EXT4_FS_XATTR
650 if (test_opt(sb
, XATTR_USER
))
651 seq_puts(seq
, ",user_xattr");
652 if (!test_opt(sb
, XATTR_USER
) &&
653 (def_mount_opts
& EXT4_DEFM_XATTR_USER
)) {
654 seq_puts(seq
, ",nouser_xattr");
657 #ifdef CONFIG_EXT4_FS_POSIX_ACL
658 if (test_opt(sb
, POSIX_ACL
))
659 seq_puts(seq
, ",acl");
660 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT4_DEFM_ACL
))
661 seq_puts(seq
, ",noacl");
663 if (!test_opt(sb
, RESERVATION
))
664 seq_puts(seq
, ",noreservation");
665 if (sbi
->s_commit_interval
) {
666 seq_printf(seq
, ",commit=%u",
667 (unsigned) (sbi
->s_commit_interval
/ HZ
));
669 if (test_opt(sb
, BARRIER
))
670 seq_puts(seq
, ",barrier=1");
671 if (test_opt(sb
, NOBH
))
672 seq_puts(seq
, ",nobh");
673 if (!test_opt(sb
, EXTENTS
))
674 seq_puts(seq
, ",noextents");
676 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
677 seq_puts(seq
, ",data=journal");
678 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
679 seq_puts(seq
, ",data=ordered");
680 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
681 seq_puts(seq
, ",data=writeback");
683 ext4_show_quota_options(seq
, sb
);
689 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
690 u64 ino
, u32 generation
)
694 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
695 return ERR_PTR(-ESTALE
);
696 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
697 return ERR_PTR(-ESTALE
);
699 /* iget isn't really right if the inode is currently unallocated!!
701 * ext4_read_inode will return a bad_inode if the inode had been
702 * deleted, so we should be safe.
704 * Currently we don't know the generation for parent directory, so
705 * a generation of 0 means "accept any"
707 inode
= iget(sb
, ino
);
709 return ERR_PTR(-ENOMEM
);
710 if (is_bad_inode(inode
) ||
711 (generation
&& inode
->i_generation
!= generation
)) {
713 return ERR_PTR(-ESTALE
);
719 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
720 int fh_len
, int fh_type
)
722 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
726 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
727 int fh_len
, int fh_type
)
729 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
734 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
735 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
737 static int ext4_dquot_initialize(struct inode
*inode
, int type
);
738 static int ext4_dquot_drop(struct inode
*inode
);
739 static int ext4_write_dquot(struct dquot
*dquot
);
740 static int ext4_acquire_dquot(struct dquot
*dquot
);
741 static int ext4_release_dquot(struct dquot
*dquot
);
742 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
743 static int ext4_write_info(struct super_block
*sb
, int type
);
744 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
, char *path
);
745 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
746 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
747 size_t len
, loff_t off
);
748 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
749 const char *data
, size_t len
, loff_t off
);
751 static struct dquot_operations ext4_quota_operations
= {
752 .initialize
= ext4_dquot_initialize
,
753 .drop
= ext4_dquot_drop
,
754 .alloc_space
= dquot_alloc_space
,
755 .alloc_inode
= dquot_alloc_inode
,
756 .free_space
= dquot_free_space
,
757 .free_inode
= dquot_free_inode
,
758 .transfer
= dquot_transfer
,
759 .write_dquot
= ext4_write_dquot
,
760 .acquire_dquot
= ext4_acquire_dquot
,
761 .release_dquot
= ext4_release_dquot
,
762 .mark_dirty
= ext4_mark_dquot_dirty
,
763 .write_info
= ext4_write_info
766 static struct quotactl_ops ext4_qctl_operations
= {
767 .quota_on
= ext4_quota_on
,
768 .quota_off
= vfs_quota_off
,
769 .quota_sync
= vfs_quota_sync
,
770 .get_info
= vfs_get_dqinfo
,
771 .set_info
= vfs_set_dqinfo
,
772 .get_dqblk
= vfs_get_dqblk
,
773 .set_dqblk
= vfs_set_dqblk
777 static const struct super_operations ext4_sops
= {
778 .alloc_inode
= ext4_alloc_inode
,
779 .destroy_inode
= ext4_destroy_inode
,
780 .read_inode
= ext4_read_inode
,
781 .write_inode
= ext4_write_inode
,
782 .dirty_inode
= ext4_dirty_inode
,
783 .delete_inode
= ext4_delete_inode
,
784 .put_super
= ext4_put_super
,
785 .write_super
= ext4_write_super
,
786 .sync_fs
= ext4_sync_fs
,
787 .write_super_lockfs
= ext4_write_super_lockfs
,
788 .unlockfs
= ext4_unlockfs
,
789 .statfs
= ext4_statfs
,
790 .remount_fs
= ext4_remount
,
791 .clear_inode
= ext4_clear_inode
,
792 .show_options
= ext4_show_options
,
794 .quota_read
= ext4_quota_read
,
795 .quota_write
= ext4_quota_write
,
799 static const struct export_operations ext4_export_ops
= {
800 .fh_to_dentry
= ext4_fh_to_dentry
,
801 .fh_to_parent
= ext4_fh_to_parent
,
802 .get_parent
= ext4_get_parent
,
806 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
807 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
808 Opt_nouid32
, Opt_nocheck
, Opt_debug
, Opt_oldalloc
, Opt_orlov
,
809 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
810 Opt_reservation
, Opt_noreservation
, Opt_noload
, Opt_nobh
, Opt_bh
,
811 Opt_commit
, Opt_journal_update
, Opt_journal_inum
, Opt_journal_dev
,
812 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
813 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
814 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_quota
, Opt_noquota
,
815 Opt_ignore
, Opt_barrier
, Opt_err
, Opt_resize
, Opt_usrquota
,
816 Opt_grpquota
, Opt_extents
, Opt_noextents
,
819 static match_table_t tokens
= {
820 {Opt_bsd_df
, "bsddf"},
821 {Opt_minix_df
, "minixdf"},
822 {Opt_grpid
, "grpid"},
823 {Opt_grpid
, "bsdgroups"},
824 {Opt_nogrpid
, "nogrpid"},
825 {Opt_nogrpid
, "sysvgroups"},
826 {Opt_resgid
, "resgid=%u"},
827 {Opt_resuid
, "resuid=%u"},
829 {Opt_err_cont
, "errors=continue"},
830 {Opt_err_panic
, "errors=panic"},
831 {Opt_err_ro
, "errors=remount-ro"},
832 {Opt_nouid32
, "nouid32"},
833 {Opt_nocheck
, "nocheck"},
834 {Opt_nocheck
, "check=none"},
835 {Opt_debug
, "debug"},
836 {Opt_oldalloc
, "oldalloc"},
837 {Opt_orlov
, "orlov"},
838 {Opt_user_xattr
, "user_xattr"},
839 {Opt_nouser_xattr
, "nouser_xattr"},
841 {Opt_noacl
, "noacl"},
842 {Opt_reservation
, "reservation"},
843 {Opt_noreservation
, "noreservation"},
844 {Opt_noload
, "noload"},
847 {Opt_commit
, "commit=%u"},
848 {Opt_journal_update
, "journal=update"},
849 {Opt_journal_inum
, "journal=%u"},
850 {Opt_journal_dev
, "journal_dev=%u"},
851 {Opt_abort
, "abort"},
852 {Opt_data_journal
, "data=journal"},
853 {Opt_data_ordered
, "data=ordered"},
854 {Opt_data_writeback
, "data=writeback"},
855 {Opt_offusrjquota
, "usrjquota="},
856 {Opt_usrjquota
, "usrjquota=%s"},
857 {Opt_offgrpjquota
, "grpjquota="},
858 {Opt_grpjquota
, "grpjquota=%s"},
859 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
860 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
861 {Opt_grpquota
, "grpquota"},
862 {Opt_noquota
, "noquota"},
863 {Opt_quota
, "quota"},
864 {Opt_usrquota
, "usrquota"},
865 {Opt_barrier
, "barrier=%u"},
866 {Opt_extents
, "extents"},
867 {Opt_noextents
, "noextents"},
869 {Opt_resize
, "resize"},
872 static ext4_fsblk_t
get_sb_block(void **data
)
874 ext4_fsblk_t sb_block
;
875 char *options
= (char *) *data
;
877 if (!options
|| strncmp(options
, "sb=", 3) != 0)
878 return 1; /* Default location */
880 /*todo: use simple_strtoll with >32bit ext4 */
881 sb_block
= simple_strtoul(options
, &options
, 0);
882 if (*options
&& *options
!= ',') {
883 printk("EXT4-fs: Invalid sb specification: %s\n",
889 *data
= (void *) options
;
893 static int parse_options (char *options
, struct super_block
*sb
,
894 unsigned int *inum
, unsigned long *journal_devnum
,
895 ext4_fsblk_t
*n_blocks_count
, int is_remount
)
897 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
899 substring_t args
[MAX_OPT_ARGS
];
910 while ((p
= strsep (&options
, ",")) != NULL
) {
915 token
= match_token(p
, tokens
, args
);
918 clear_opt (sbi
->s_mount_opt
, MINIX_DF
);
921 set_opt (sbi
->s_mount_opt
, MINIX_DF
);
924 set_opt (sbi
->s_mount_opt
, GRPID
);
927 clear_opt (sbi
->s_mount_opt
, GRPID
);
930 if (match_int(&args
[0], &option
))
932 sbi
->s_resuid
= option
;
935 if (match_int(&args
[0], &option
))
937 sbi
->s_resgid
= option
;
940 /* handled by get_sb_block() instead of here */
941 /* *sb_block = match_int(&args[0]); */
944 clear_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
945 clear_opt (sbi
->s_mount_opt
, ERRORS_RO
);
946 set_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
949 clear_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
950 clear_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
951 set_opt (sbi
->s_mount_opt
, ERRORS_RO
);
954 clear_opt (sbi
->s_mount_opt
, ERRORS_RO
);
955 clear_opt (sbi
->s_mount_opt
, ERRORS_PANIC
);
956 set_opt (sbi
->s_mount_opt
, ERRORS_CONT
);
959 set_opt (sbi
->s_mount_opt
, NO_UID32
);
962 clear_opt (sbi
->s_mount_opt
, CHECK
);
965 set_opt (sbi
->s_mount_opt
, DEBUG
);
968 set_opt (sbi
->s_mount_opt
, OLDALLOC
);
971 clear_opt (sbi
->s_mount_opt
, OLDALLOC
);
973 #ifdef CONFIG_EXT4DEV_FS_XATTR
975 set_opt (sbi
->s_mount_opt
, XATTR_USER
);
977 case Opt_nouser_xattr
:
978 clear_opt (sbi
->s_mount_opt
, XATTR_USER
);
982 case Opt_nouser_xattr
:
983 printk("EXT4 (no)user_xattr options not supported\n");
986 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
988 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
991 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
996 printk("EXT4 (no)acl options not supported\n");
999 case Opt_reservation
:
1000 set_opt(sbi
->s_mount_opt
, RESERVATION
);
1002 case Opt_noreservation
:
1003 clear_opt(sbi
->s_mount_opt
, RESERVATION
);
1005 case Opt_journal_update
:
1007 /* Eventually we will want to be able to create
1008 a journal file here. For now, only allow the
1009 user to specify an existing inode to be the
1012 printk(KERN_ERR
"EXT4-fs: cannot specify "
1013 "journal on remount\n");
1016 set_opt (sbi
->s_mount_opt
, UPDATE_JOURNAL
);
1018 case Opt_journal_inum
:
1020 printk(KERN_ERR
"EXT4-fs: cannot specify "
1021 "journal on remount\n");
1024 if (match_int(&args
[0], &option
))
1028 case Opt_journal_dev
:
1030 printk(KERN_ERR
"EXT4-fs: cannot specify "
1031 "journal on remount\n");
1034 if (match_int(&args
[0], &option
))
1036 *journal_devnum
= option
;
1039 set_opt (sbi
->s_mount_opt
, NOLOAD
);
1042 if (match_int(&args
[0], &option
))
1047 option
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1048 sbi
->s_commit_interval
= HZ
* option
;
1050 case Opt_data_journal
:
1051 data_opt
= EXT4_MOUNT_JOURNAL_DATA
;
1053 case Opt_data_ordered
:
1054 data_opt
= EXT4_MOUNT_ORDERED_DATA
;
1056 case Opt_data_writeback
:
1057 data_opt
= EXT4_MOUNT_WRITEBACK_DATA
;
1060 if ((sbi
->s_mount_opt
& EXT4_MOUNT_DATA_FLAGS
)
1063 "EXT4-fs: cannot change data "
1064 "mode on remount\n");
1068 sbi
->s_mount_opt
&= ~EXT4_MOUNT_DATA_FLAGS
;
1069 sbi
->s_mount_opt
|= data_opt
;
1079 if (sb_any_quota_enabled(sb
)) {
1081 "EXT4-fs: Cannot change journalled "
1082 "quota options when quota turned on.\n");
1085 qname
= match_strdup(&args
[0]);
1088 "EXT4-fs: not enough memory for "
1089 "storing quotafile name.\n");
1092 if (sbi
->s_qf_names
[qtype
] &&
1093 strcmp(sbi
->s_qf_names
[qtype
], qname
)) {
1095 "EXT4-fs: %s quota file already "
1096 "specified.\n", QTYPE2NAME(qtype
));
1100 sbi
->s_qf_names
[qtype
] = qname
;
1101 if (strchr(sbi
->s_qf_names
[qtype
], '/')) {
1103 "EXT4-fs: quotafile must be on "
1104 "filesystem root.\n");
1105 kfree(sbi
->s_qf_names
[qtype
]);
1106 sbi
->s_qf_names
[qtype
] = NULL
;
1109 set_opt(sbi
->s_mount_opt
, QUOTA
);
1111 case Opt_offusrjquota
:
1114 case Opt_offgrpjquota
:
1117 if (sb_any_quota_enabled(sb
)) {
1118 printk(KERN_ERR
"EXT4-fs: Cannot change "
1119 "journalled quota options when "
1120 "quota turned on.\n");
1124 * The space will be released later when all options
1125 * are confirmed to be correct
1127 sbi
->s_qf_names
[qtype
] = NULL
;
1129 case Opt_jqfmt_vfsold
:
1130 sbi
->s_jquota_fmt
= QFMT_VFS_OLD
;
1132 case Opt_jqfmt_vfsv0
:
1133 sbi
->s_jquota_fmt
= QFMT_VFS_V0
;
1137 set_opt(sbi
->s_mount_opt
, QUOTA
);
1138 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
1141 set_opt(sbi
->s_mount_opt
, QUOTA
);
1142 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1145 if (sb_any_quota_enabled(sb
)) {
1146 printk(KERN_ERR
"EXT4-fs: Cannot change quota "
1147 "options when quota turned on.\n");
1150 clear_opt(sbi
->s_mount_opt
, QUOTA
);
1151 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1152 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1160 case Opt_offusrjquota
:
1161 case Opt_offgrpjquota
:
1162 case Opt_jqfmt_vfsold
:
1163 case Opt_jqfmt_vfsv0
:
1165 "EXT4-fs: journalled quota options not "
1172 set_opt(sbi
->s_mount_opt
, ABORT
);
1175 if (match_int(&args
[0], &option
))
1178 set_opt(sbi
->s_mount_opt
, BARRIER
);
1180 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1186 printk("EXT4-fs: resize option only available "
1190 if (match_int(&args
[0], &option
) != 0)
1192 *n_blocks_count
= option
;
1195 set_opt(sbi
->s_mount_opt
, NOBH
);
1198 clear_opt(sbi
->s_mount_opt
, NOBH
);
1201 set_opt (sbi
->s_mount_opt
, EXTENTS
);
1204 clear_opt (sbi
->s_mount_opt
, EXTENTS
);
1208 "EXT4-fs: Unrecognized mount option \"%s\" "
1209 "or missing value\n", p
);
1214 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1215 if ((sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
) &&
1216 sbi
->s_qf_names
[USRQUOTA
])
1217 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1219 if ((sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
) &&
1220 sbi
->s_qf_names
[GRPQUOTA
])
1221 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1223 if ((sbi
->s_qf_names
[USRQUOTA
] &&
1224 (sbi
->s_mount_opt
& EXT4_MOUNT_GRPQUOTA
)) ||
1225 (sbi
->s_qf_names
[GRPQUOTA
] &&
1226 (sbi
->s_mount_opt
& EXT4_MOUNT_USRQUOTA
))) {
1227 printk(KERN_ERR
"EXT4-fs: old and new quota "
1228 "format mixing.\n");
1232 if (!sbi
->s_jquota_fmt
) {
1233 printk(KERN_ERR
"EXT4-fs: journalled quota format "
1234 "not specified.\n");
1238 if (sbi
->s_jquota_fmt
) {
1239 printk(KERN_ERR
"EXT4-fs: journalled quota format "
1240 "specified with no journalling "
1249 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1252 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1255 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1256 printk (KERN_ERR
"EXT4-fs warning: revision level too high, "
1257 "forcing read-only mode\n");
1262 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1263 printk (KERN_WARNING
"EXT4-fs warning: mounting unchecked fs, "
1264 "running e2fsck is recommended\n");
1265 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1266 printk (KERN_WARNING
1267 "EXT4-fs warning: mounting fs with errors, "
1268 "running e2fsck is recommended\n");
1269 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
1270 le16_to_cpu(es
->s_mnt_count
) >=
1271 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1272 printk (KERN_WARNING
1273 "EXT4-fs warning: maximal mount count reached, "
1274 "running e2fsck is recommended\n");
1275 else if (le32_to_cpu(es
->s_checkinterval
) &&
1276 (le32_to_cpu(es
->s_lastcheck
) +
1277 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1278 printk (KERN_WARNING
1279 "EXT4-fs warning: checktime reached, "
1280 "running e2fsck is recommended\n");
1282 /* @@@ We _will_ want to clear the valid bit if we find
1283 * inconsistencies, to force a fsck at reboot. But for
1284 * a plain journaled filesystem we can keep it set as
1287 es
->s_state
= cpu_to_le16(le16_to_cpu(es
->s_state
) & ~EXT4_VALID_FS
);
1289 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1290 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1291 es
->s_mnt_count
=cpu_to_le16(le16_to_cpu(es
->s_mnt_count
) + 1);
1292 es
->s_mtime
= cpu_to_le32(get_seconds());
1293 ext4_update_dynamic_rev(sb
);
1294 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1296 ext4_commit_super(sb
, es
, 1);
1297 if (test_opt(sb
, DEBUG
))
1298 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%lu, "
1299 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1301 sbi
->s_groups_count
,
1302 EXT4_BLOCKS_PER_GROUP(sb
),
1303 EXT4_INODES_PER_GROUP(sb
),
1306 printk(KERN_INFO
"EXT4 FS on %s, ", sb
->s_id
);
1307 if (EXT4_SB(sb
)->s_journal
->j_inode
== NULL
) {
1308 char b
[BDEVNAME_SIZE
];
1310 printk("external journal on %s\n",
1311 bdevname(EXT4_SB(sb
)->s_journal
->j_dev
, b
));
1313 printk("internal journal\n");
1318 __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
1319 struct ext4_group_desc
*gdp
)
1323 if (sbi
->s_es
->s_feature_ro_compat
&
1324 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) {
1325 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
1326 __le32 le_group
= cpu_to_le32(block_group
);
1328 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
1329 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
1330 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
1331 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
1332 /* for checksum of struct ext4_group_desc do the rest...*/
1333 if ((sbi
->s_es
->s_feature_incompat
&
1334 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
1335 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
1336 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
1337 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
1341 return cpu_to_le16(crc
);
1344 int ext4_group_desc_csum_verify(struct ext4_sb_info
*sbi
, __u32 block_group
,
1345 struct ext4_group_desc
*gdp
)
1347 if ((sbi
->s_es
->s_feature_ro_compat
&
1348 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) &&
1349 (gdp
->bg_checksum
!= ext4_group_desc_csum(sbi
, block_group
, gdp
)))
1355 /* Called at mount-time, super-block is locked */
1356 static int ext4_check_descriptors (struct super_block
* sb
)
1358 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1359 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
1360 ext4_fsblk_t last_block
;
1361 ext4_fsblk_t block_bitmap
;
1362 ext4_fsblk_t inode_bitmap
;
1363 ext4_fsblk_t inode_table
;
1364 struct ext4_group_desc
* gdp
= NULL
;
1366 int flexbg_flag
= 0;
1369 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
1372 ext4_debug ("Checking group descriptors");
1374 for (i
= 0; i
< sbi
->s_groups_count
; i
++)
1376 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
1377 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
1379 last_block
= first_block
+
1380 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
1382 if ((i
% EXT4_DESC_PER_BLOCK(sb
)) == 0)
1383 gdp
= (struct ext4_group_desc
*)
1384 sbi
->s_group_desc
[desc_block
++]->b_data
;
1385 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
1386 if (block_bitmap
< first_block
|| block_bitmap
> last_block
)
1388 ext4_error (sb
, "ext4_check_descriptors",
1389 "Block bitmap for group %d"
1390 " not in group (block %llu)!",
1394 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
1395 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
)
1397 ext4_error (sb
, "ext4_check_descriptors",
1398 "Inode bitmap for group %d"
1399 " not in group (block %llu)!",
1403 inode_table
= ext4_inode_table(sb
, gdp
);
1404 if (inode_table
< first_block
||
1405 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
)
1407 ext4_error (sb
, "ext4_check_descriptors",
1408 "Inode table for group %d"
1409 " not in group (block %llu)!",
1413 if (!ext4_group_desc_csum_verify(sbi
, i
, gdp
)) {
1414 ext4_error(sb
, __FUNCTION__
,
1415 "Checksum for group %d failed (%u!=%u)\n", i
,
1416 le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
1418 le16_to_cpu(gdp
->bg_checksum
));
1422 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
1423 gdp
= (struct ext4_group_desc
*)
1424 ((__u8
*)gdp
+ EXT4_DESC_SIZE(sb
));
1427 ext4_free_blocks_count_set(sbi
->s_es
, ext4_count_free_blocks(sb
));
1428 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
1433 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1434 * the superblock) which were deleted from all directories, but held open by
1435 * a process at the time of a crash. We walk the list and try to delete these
1436 * inodes at recovery time (only with a read-write filesystem).
1438 * In order to keep the orphan inode chain consistent during traversal (in
1439 * case of crash during recovery), we link each inode into the superblock
1440 * orphan list_head and handle it the same way as an inode deletion during
1441 * normal operation (which journals the operations for us).
1443 * We only do an iget() and an iput() on each inode, which is very safe if we
1444 * accidentally point at an in-use or already deleted inode. The worst that
1445 * can happen in this case is that we get a "bit already cleared" message from
1446 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1447 * e2fsck was run on this filesystem, and it must have already done the orphan
1448 * inode cleanup for us, so we can safely abort without any further action.
1450 static void ext4_orphan_cleanup (struct super_block
* sb
,
1451 struct ext4_super_block
* es
)
1453 unsigned int s_flags
= sb
->s_flags
;
1454 int nr_orphans
= 0, nr_truncates
= 0;
1458 if (!es
->s_last_orphan
) {
1459 jbd_debug(4, "no orphan inodes to clean up\n");
1463 if (bdev_read_only(sb
->s_bdev
)) {
1464 printk(KERN_ERR
"EXT4-fs: write access "
1465 "unavailable, skipping orphan cleanup.\n");
1469 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
1470 if (es
->s_last_orphan
)
1471 jbd_debug(1, "Errors on filesystem, "
1472 "clearing orphan list.\n");
1473 es
->s_last_orphan
= 0;
1474 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1478 if (s_flags
& MS_RDONLY
) {
1479 printk(KERN_INFO
"EXT4-fs: %s: orphan cleanup on readonly fs\n",
1481 sb
->s_flags
&= ~MS_RDONLY
;
1484 /* Needed for iput() to work correctly and not trash data */
1485 sb
->s_flags
|= MS_ACTIVE
;
1486 /* Turn on quotas so that they are updated correctly */
1487 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1488 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
1489 int ret
= ext4_quota_on_mount(sb
, i
);
1492 "EXT4-fs: Cannot turn on journalled "
1493 "quota: error %d\n", ret
);
1498 while (es
->s_last_orphan
) {
1499 struct inode
*inode
;
1502 ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
)))) {
1503 es
->s_last_orphan
= 0;
1507 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
1509 if (inode
->i_nlink
) {
1511 "%s: truncating inode %lu to %Ld bytes\n",
1512 __FUNCTION__
, inode
->i_ino
, inode
->i_size
);
1513 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1514 inode
->i_ino
, inode
->i_size
);
1515 ext4_truncate(inode
);
1519 "%s: deleting unreferenced inode %lu\n",
1520 __FUNCTION__
, inode
->i_ino
);
1521 jbd_debug(2, "deleting unreferenced inode %lu\n",
1525 iput(inode
); /* The delete magic happens here! */
1528 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1531 printk(KERN_INFO
"EXT4-fs: %s: %d orphan inode%s deleted\n",
1532 sb
->s_id
, PLURAL(nr_orphans
));
1534 printk(KERN_INFO
"EXT4-fs: %s: %d truncate%s cleaned up\n",
1535 sb
->s_id
, PLURAL(nr_truncates
));
1537 /* Turn quotas off */
1538 for (i
= 0; i
< MAXQUOTAS
; i
++) {
1539 if (sb_dqopt(sb
)->files
[i
])
1540 vfs_quota_off(sb
, i
);
1543 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
1547 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1548 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1549 * We need to be 1 filesystem block less than the 2^32 sector limit.
1551 static loff_t
ext4_max_size(int bits
)
1553 loff_t res
= EXT4_NDIR_BLOCKS
;
1554 /* This constant is calculated to be the largest file size for a
1555 * dense, 4k-blocksize file such that the total number of
1556 * sectors in the file, including data and all indirect blocks,
1557 * does not exceed 2^32. */
1558 const loff_t upper_limit
= 0x1ff7fffd000LL
;
1560 res
+= 1LL << (bits
-2);
1561 res
+= 1LL << (2*(bits
-2));
1562 res
+= 1LL << (3*(bits
-2));
1564 if (res
> upper_limit
)
1569 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
1570 ext4_fsblk_t logical_sb_block
, int nr
)
1572 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1573 unsigned long bg
, first_meta_bg
;
1576 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
1578 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
1580 return logical_sb_block
+ nr
+ 1;
1581 bg
= sbi
->s_desc_per_block
* nr
;
1582 if (ext4_bg_has_super(sb
, bg
))
1584 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
1588 static int ext4_fill_super (struct super_block
*sb
, void *data
, int silent
)
1590 struct buffer_head
* bh
;
1591 struct ext4_super_block
*es
= NULL
;
1592 struct ext4_sb_info
*sbi
;
1594 ext4_fsblk_t sb_block
= get_sb_block(&data
);
1595 ext4_fsblk_t logical_sb_block
;
1596 unsigned long offset
= 0;
1597 unsigned int journal_inum
= 0;
1598 unsigned long journal_devnum
= 0;
1599 unsigned long def_mount_opts
;
1610 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
1613 sb
->s_fs_info
= sbi
;
1614 sbi
->s_mount_opt
= 0;
1615 sbi
->s_resuid
= EXT4_DEF_RESUID
;
1616 sbi
->s_resgid
= EXT4_DEF_RESGID
;
1617 sbi
->s_sb_block
= sb_block
;
1621 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
1623 printk(KERN_ERR
"EXT4-fs: unable to set blocksize\n");
1628 * The ext4 superblock will not be buffer aligned for other than 1kB
1629 * block sizes. We need to calculate the offset from buffer start.
1631 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
1632 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
1633 offset
= do_div(logical_sb_block
, blocksize
);
1635 logical_sb_block
= sb_block
;
1638 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
1639 printk (KERN_ERR
"EXT4-fs: unable to read superblock\n");
1643 * Note: s_es must be initialized as soon as possible because
1644 * some ext4 macro-instructions depend on its value
1646 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
1648 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
1649 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
1652 /* Set defaults before we parse the mount options */
1653 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
1654 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
1655 set_opt(sbi
->s_mount_opt
, DEBUG
);
1656 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
1657 set_opt(sbi
->s_mount_opt
, GRPID
);
1658 if (def_mount_opts
& EXT4_DEFM_UID16
)
1659 set_opt(sbi
->s_mount_opt
, NO_UID32
);
1660 #ifdef CONFIG_EXT4DEV_FS_XATTR
1661 if (def_mount_opts
& EXT4_DEFM_XATTR_USER
)
1662 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
1664 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1665 if (def_mount_opts
& EXT4_DEFM_ACL
)
1666 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1668 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
1669 sbi
->s_mount_opt
|= EXT4_MOUNT_JOURNAL_DATA
;
1670 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
1671 sbi
->s_mount_opt
|= EXT4_MOUNT_ORDERED_DATA
;
1672 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
1673 sbi
->s_mount_opt
|= EXT4_MOUNT_WRITEBACK_DATA
;
1675 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
1676 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1677 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_RO
)
1678 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1680 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1682 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
1683 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
1685 set_opt(sbi
->s_mount_opt
, RESERVATION
);
1688 * turn on extents feature by default in ext4 filesystem
1689 * User -o noextents to turn it off
1691 set_opt(sbi
->s_mount_opt
, EXTENTS
);
1693 if (!parse_options ((char *) data
, sb
, &journal_inum
, &journal_devnum
,
1697 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
1698 ((sbi
->s_mount_opt
& EXT4_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
1700 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
1701 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
1702 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
1703 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
1705 "EXT4-fs warning: feature flags set on rev 0 fs, "
1706 "running e2fsck is recommended\n");
1708 * Check feature flags regardless of the revision level, since we
1709 * previously didn't change the revision level when setting the flags,
1710 * so there is a chance incompat flags are set on a rev 0 filesystem.
1712 features
= EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
);
1714 printk(KERN_ERR
"EXT4-fs: %s: couldn't mount because of "
1715 "unsupported optional features (%x).\n",
1716 sb
->s_id
, le32_to_cpu(features
));
1719 features
= EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
);
1720 if (!(sb
->s_flags
& MS_RDONLY
) && features
) {
1721 printk(KERN_ERR
"EXT4-fs: %s: couldn't mount RDWR because of "
1722 "unsupported optional features (%x).\n",
1723 sb
->s_id
, le32_to_cpu(features
));
1726 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
1728 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
1729 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
1731 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
1732 blocksize
, sb
->s_id
);
1736 hblock
= bdev_hardsect_size(sb
->s_bdev
);
1737 if (sb
->s_blocksize
!= blocksize
) {
1739 * Make sure the blocksize for the filesystem is larger
1740 * than the hardware sectorsize for the machine.
1742 if (blocksize
< hblock
) {
1743 printk(KERN_ERR
"EXT4-fs: blocksize %d too small for "
1744 "device blocksize %d.\n", blocksize
, hblock
);
1749 sb_set_blocksize(sb
, blocksize
);
1750 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
1751 offset
= do_div(logical_sb_block
, blocksize
);
1752 bh
= sb_bread(sb
, logical_sb_block
);
1755 "EXT4-fs: Can't read superblock on 2nd try.\n");
1758 es
= (struct ext4_super_block
*)(((char *)bh
->b_data
) + offset
);
1760 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
1762 "EXT4-fs: Magic mismatch, very weird !\n");
1767 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
);
1769 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
1770 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
1771 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
1773 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
1774 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
1775 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
1776 (!is_power_of_2(sbi
->s_inode_size
)) ||
1777 (sbi
->s_inode_size
> blocksize
)) {
1779 "EXT4-fs: unsupported inode size: %d\n",
1783 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
1784 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
1786 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
1787 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
1788 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
1789 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
1790 !is_power_of_2(sbi
->s_desc_size
)) {
1792 "EXT4-fs: unsupported descriptor size %lu\n",
1797 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
1798 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
1799 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
1800 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
1802 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
1803 if (sbi
->s_inodes_per_block
== 0)
1805 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
1806 sbi
->s_inodes_per_block
;
1807 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
1809 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
1810 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
1811 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
1812 for (i
=0; i
< 4; i
++)
1813 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
1814 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
1816 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
1818 "EXT4-fs: #blocks per group too big: %lu\n",
1819 sbi
->s_blocks_per_group
);
1822 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
1824 "EXT4-fs: #inodes per group too big: %lu\n",
1825 sbi
->s_inodes_per_group
);
1829 if (ext4_blocks_count(es
) >
1830 (sector_t
)(~0ULL) >> (sb
->s_blocksize_bits
- 9)) {
1831 printk(KERN_ERR
"EXT4-fs: filesystem on %s:"
1832 " too large to mount safely\n", sb
->s_id
);
1833 if (sizeof(sector_t
) < 8)
1834 printk(KERN_WARNING
"EXT4-fs: CONFIG_LBD not "
1839 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
1841 blocks_count
= (ext4_blocks_count(es
) -
1842 le32_to_cpu(es
->s_first_data_block
) +
1843 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
1844 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
1845 sbi
->s_groups_count
= blocks_count
;
1846 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
1847 EXT4_DESC_PER_BLOCK(sb
);
1848 sbi
->s_group_desc
= kmalloc(db_count
* sizeof (struct buffer_head
*),
1850 if (sbi
->s_group_desc
== NULL
) {
1851 printk (KERN_ERR
"EXT4-fs: not enough memory\n");
1855 bgl_lock_init(&sbi
->s_blockgroup_lock
);
1857 for (i
= 0; i
< db_count
; i
++) {
1858 block
= descriptor_loc(sb
, logical_sb_block
, i
);
1859 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
1860 if (!sbi
->s_group_desc
[i
]) {
1861 printk (KERN_ERR
"EXT4-fs: "
1862 "can't read group descriptor %d\n", i
);
1867 if (!ext4_check_descriptors (sb
)) {
1868 printk(KERN_ERR
"EXT4-fs: group descriptors corrupted!\n");
1871 sbi
->s_gdb_count
= db_count
;
1872 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
1873 spin_lock_init(&sbi
->s_next_gen_lock
);
1875 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
1876 ext4_count_free_blocks(sb
));
1878 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
1879 ext4_count_free_inodes(sb
));
1882 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
1883 ext4_count_dirs(sb
));
1886 printk(KERN_ERR
"EXT4-fs: insufficient memory\n");
1890 /* per fileystem reservation list head & lock */
1891 spin_lock_init(&sbi
->s_rsv_window_lock
);
1892 sbi
->s_rsv_window_root
= RB_ROOT
;
1893 /* Add a single, static dummy reservation to the start of the
1894 * reservation window list --- it gives us a placeholder for
1895 * append-at-start-of-list which makes the allocation logic
1896 * _much_ simpler. */
1897 sbi
->s_rsv_window_head
.rsv_start
= EXT4_RESERVE_WINDOW_NOT_ALLOCATED
;
1898 sbi
->s_rsv_window_head
.rsv_end
= EXT4_RESERVE_WINDOW_NOT_ALLOCATED
;
1899 sbi
->s_rsv_window_head
.rsv_alloc_hit
= 0;
1900 sbi
->s_rsv_window_head
.rsv_goal_size
= 0;
1901 ext4_rsv_window_add(sb
, &sbi
->s_rsv_window_head
);
1904 * set up enough so that it can read an inode
1906 sb
->s_op
= &ext4_sops
;
1907 sb
->s_export_op
= &ext4_export_ops
;
1908 sb
->s_xattr
= ext4_xattr_handlers
;
1910 sb
->s_qcop
= &ext4_qctl_operations
;
1911 sb
->dq_op
= &ext4_quota_operations
;
1913 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
1917 needs_recovery
= (es
->s_last_orphan
!= 0 ||
1918 EXT4_HAS_INCOMPAT_FEATURE(sb
,
1919 EXT4_FEATURE_INCOMPAT_RECOVER
));
1922 * The first inode we look at is the journal inode. Don't try
1923 * root first: it may be modified in the journal!
1925 if (!test_opt(sb
, NOLOAD
) &&
1926 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
1927 if (ext4_load_journal(sb
, es
, journal_devnum
))
1929 } else if (journal_inum
) {
1930 if (ext4_create_journal(sb
, es
, journal_inum
))
1935 "ext4: No journal on filesystem on %s\n",
1940 if (ext4_blocks_count(es
) > 0xffffffffULL
&&
1941 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
1942 JBD2_FEATURE_INCOMPAT_64BIT
)) {
1943 printk(KERN_ERR
"ext4: Failed to set 64-bit journal feature\n");
1947 /* We have now updated the journal if required, so we can
1948 * validate the data journaling mode. */
1949 switch (test_opt(sb
, DATA_FLAGS
)) {
1951 /* No mode set, assume a default based on the journal
1952 * capabilities: ORDERED_DATA if the journal can
1953 * cope, else JOURNAL_DATA
1955 if (jbd2_journal_check_available_features
1956 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
1957 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
1959 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
1962 case EXT4_MOUNT_ORDERED_DATA
:
1963 case EXT4_MOUNT_WRITEBACK_DATA
:
1964 if (!jbd2_journal_check_available_features
1965 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
1966 printk(KERN_ERR
"EXT4-fs: Journal does not support "
1967 "requested data journaling mode\n");
1974 if (test_opt(sb
, NOBH
)) {
1975 if (!(test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)) {
1976 printk(KERN_WARNING
"EXT4-fs: Ignoring nobh option - "
1977 "its supported only with writeback mode\n");
1978 clear_opt(sbi
->s_mount_opt
, NOBH
);
1982 * The jbd2_journal_load will have done any necessary log recovery,
1983 * so we can safely mount the rest of the filesystem now.
1986 root
= iget(sb
, EXT4_ROOT_INO
);
1987 sb
->s_root
= d_alloc_root(root
);
1989 printk(KERN_ERR
"EXT4-fs: get root inode failed\n");
1993 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
1996 printk(KERN_ERR
"EXT4-fs: corrupt root inode, run e2fsck\n");
2000 ext4_setup_super (sb
, es
, sb
->s_flags
& MS_RDONLY
);
2002 /* determine the minimum size of new large inodes, if present */
2003 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
2004 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2005 EXT4_GOOD_OLD_INODE_SIZE
;
2006 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2007 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
2008 if (sbi
->s_want_extra_isize
<
2009 le16_to_cpu(es
->s_want_extra_isize
))
2010 sbi
->s_want_extra_isize
=
2011 le16_to_cpu(es
->s_want_extra_isize
);
2012 if (sbi
->s_want_extra_isize
<
2013 le16_to_cpu(es
->s_min_extra_isize
))
2014 sbi
->s_want_extra_isize
=
2015 le16_to_cpu(es
->s_min_extra_isize
);
2018 /* Check if enough inode space is available */
2019 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
2020 sbi
->s_inode_size
) {
2021 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
2022 EXT4_GOOD_OLD_INODE_SIZE
;
2023 printk(KERN_INFO
"EXT4-fs: required extra inode space not"
2028 * akpm: core read_super() calls in here with the superblock locked.
2029 * That deadlocks, because orphan cleanup needs to lock the superblock
2030 * in numerous places. Here we just pop the lock - it's relatively
2031 * harmless, because we are now ready to accept write_super() requests,
2032 * and aviro says that's the only reason for hanging onto the
2035 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
2036 ext4_orphan_cleanup(sb
, es
);
2037 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
2039 printk (KERN_INFO
"EXT4-fs: recovery complete.\n");
2040 ext4_mark_recovery_complete(sb
, es
);
2041 printk (KERN_INFO
"EXT4-fs: mounted filesystem with %s data mode.\n",
2042 test_opt(sb
,DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
? "journal":
2043 test_opt(sb
,DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
? "ordered":
2053 printk(KERN_ERR
"VFS: Can't find ext4 filesystem on dev %s.\n",
2058 jbd2_journal_destroy(sbi
->s_journal
);
2060 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
2061 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
2062 percpu_counter_destroy(&sbi
->s_dirs_counter
);
2064 for (i
= 0; i
< db_count
; i
++)
2065 brelse(sbi
->s_group_desc
[i
]);
2066 kfree(sbi
->s_group_desc
);
2069 for (i
= 0; i
< MAXQUOTAS
; i
++)
2070 kfree(sbi
->s_qf_names
[i
]);
2072 ext4_blkdev_remove(sbi
);
2075 sb
->s_fs_info
= NULL
;
2082 * Setup any per-fs journal parameters now. We'll do this both on
2083 * initial mount, once the journal has been initialised but before we've
2084 * done any recovery; and again on any subsequent remount.
2086 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
2088 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2090 if (sbi
->s_commit_interval
)
2091 journal
->j_commit_interval
= sbi
->s_commit_interval
;
2092 /* We could also set up an ext4-specific default for the commit
2093 * interval here, but for now we'll just fall back to the jbd
2096 spin_lock(&journal
->j_state_lock
);
2097 if (test_opt(sb
, BARRIER
))
2098 journal
->j_flags
|= JBD2_BARRIER
;
2100 journal
->j_flags
&= ~JBD2_BARRIER
;
2101 spin_unlock(&journal
->j_state_lock
);
2104 static journal_t
*ext4_get_journal(struct super_block
*sb
,
2105 unsigned int journal_inum
)
2107 struct inode
*journal_inode
;
2110 /* First, test for the existence of a valid inode on disk. Bad
2111 * things happen if we iget() an unused inode, as the subsequent
2112 * iput() will try to delete it. */
2114 journal_inode
= iget(sb
, journal_inum
);
2115 if (!journal_inode
) {
2116 printk(KERN_ERR
"EXT4-fs: no journal found.\n");
2119 if (!journal_inode
->i_nlink
) {
2120 make_bad_inode(journal_inode
);
2121 iput(journal_inode
);
2122 printk(KERN_ERR
"EXT4-fs: journal inode is deleted.\n");
2126 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2127 journal_inode
, journal_inode
->i_size
);
2128 if (is_bad_inode(journal_inode
) || !S_ISREG(journal_inode
->i_mode
)) {
2129 printk(KERN_ERR
"EXT4-fs: invalid journal inode.\n");
2130 iput(journal_inode
);
2134 journal
= jbd2_journal_init_inode(journal_inode
);
2136 printk(KERN_ERR
"EXT4-fs: Could not load journal inode\n");
2137 iput(journal_inode
);
2140 journal
->j_private
= sb
;
2141 ext4_init_journal_params(sb
, journal
);
2145 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
2148 struct buffer_head
* bh
;
2152 int hblock
, blocksize
;
2153 ext4_fsblk_t sb_block
;
2154 unsigned long offset
;
2155 struct ext4_super_block
* es
;
2156 struct block_device
*bdev
;
2158 bdev
= ext4_blkdev_get(j_dev
);
2162 if (bd_claim(bdev
, sb
)) {
2164 "EXT4: failed to claim external journal device.\n");
2169 blocksize
= sb
->s_blocksize
;
2170 hblock
= bdev_hardsect_size(bdev
);
2171 if (blocksize
< hblock
) {
2173 "EXT4-fs: blocksize too small for journal device.\n");
2177 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
2178 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
2179 set_blocksize(bdev
, blocksize
);
2180 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
2181 printk(KERN_ERR
"EXT4-fs: couldn't read superblock of "
2182 "external journal\n");
2186 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
2187 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
2188 !(le32_to_cpu(es
->s_feature_incompat
) &
2189 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
2190 printk(KERN_ERR
"EXT4-fs: external journal has "
2191 "bad superblock\n");
2196 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
2197 printk(KERN_ERR
"EXT4-fs: journal UUID does not match\n");
2202 len
= ext4_blocks_count(es
);
2203 start
= sb_block
+ 1;
2204 brelse(bh
); /* we're done with the superblock */
2206 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
2207 start
, len
, blocksize
);
2209 printk(KERN_ERR
"EXT4-fs: failed to create device journal\n");
2212 journal
->j_private
= sb
;
2213 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
2214 wait_on_buffer(journal
->j_sb_buffer
);
2215 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
2216 printk(KERN_ERR
"EXT4-fs: I/O error on journal device\n");
2219 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
2220 printk(KERN_ERR
"EXT4-fs: External journal has more than one "
2221 "user (unsupported) - %d\n",
2222 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
2225 EXT4_SB(sb
)->journal_bdev
= bdev
;
2226 ext4_init_journal_params(sb
, journal
);
2229 jbd2_journal_destroy(journal
);
2231 ext4_blkdev_put(bdev
);
2235 static int ext4_load_journal(struct super_block
*sb
,
2236 struct ext4_super_block
*es
,
2237 unsigned long journal_devnum
)
2240 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
2243 int really_read_only
;
2245 if (journal_devnum
&&
2246 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
2247 printk(KERN_INFO
"EXT4-fs: external journal device major/minor "
2248 "numbers have changed\n");
2249 journal_dev
= new_decode_dev(journal_devnum
);
2251 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
2253 really_read_only
= bdev_read_only(sb
->s_bdev
);
2256 * Are we loading a blank journal or performing recovery after a
2257 * crash? For recovery, we need to check in advance whether we
2258 * can get read-write access to the device.
2261 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
2262 if (sb
->s_flags
& MS_RDONLY
) {
2263 printk(KERN_INFO
"EXT4-fs: INFO: recovery "
2264 "required on readonly filesystem.\n");
2265 if (really_read_only
) {
2266 printk(KERN_ERR
"EXT4-fs: write access "
2267 "unavailable, cannot proceed.\n");
2270 printk (KERN_INFO
"EXT4-fs: write access will "
2271 "be enabled during recovery.\n");
2275 if (journal_inum
&& journal_dev
) {
2276 printk(KERN_ERR
"EXT4-fs: filesystem has both journal "
2277 "and inode journals!\n");
2282 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
2285 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
2289 if (!really_read_only
&& test_opt(sb
, UPDATE_JOURNAL
)) {
2290 err
= jbd2_journal_update_format(journal
);
2292 printk(KERN_ERR
"EXT4-fs: error updating journal.\n");
2293 jbd2_journal_destroy(journal
);
2298 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
2299 err
= jbd2_journal_wipe(journal
, !really_read_only
);
2301 err
= jbd2_journal_load(journal
);
2304 printk(KERN_ERR
"EXT4-fs: error loading journal.\n");
2305 jbd2_journal_destroy(journal
);
2309 EXT4_SB(sb
)->s_journal
= journal
;
2310 ext4_clear_journal_err(sb
, es
);
2312 if (journal_devnum
&&
2313 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
2314 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
2317 /* Make sure we flush the recovery flag to disk. */
2318 ext4_commit_super(sb
, es
, 1);
2324 static int ext4_create_journal(struct super_block
* sb
,
2325 struct ext4_super_block
* es
,
2326 unsigned int journal_inum
)
2331 if (sb
->s_flags
& MS_RDONLY
) {
2332 printk(KERN_ERR
"EXT4-fs: readonly filesystem when trying to "
2333 "create journal.\n");
2337 journal
= ext4_get_journal(sb
, journal_inum
);
2341 printk(KERN_INFO
"EXT4-fs: creating new journal on inode %u\n",
2344 err
= jbd2_journal_create(journal
);
2346 printk(KERN_ERR
"EXT4-fs: error creating journal.\n");
2347 jbd2_journal_destroy(journal
);
2351 EXT4_SB(sb
)->s_journal
= journal
;
2353 ext4_update_dynamic_rev(sb
);
2354 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
2355 EXT4_SET_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
);
2357 es
->s_journal_inum
= cpu_to_le32(journal_inum
);
2360 /* Make sure we flush the recovery flag to disk. */
2361 ext4_commit_super(sb
, es
, 1);
2366 static void ext4_commit_super (struct super_block
* sb
,
2367 struct ext4_super_block
* es
,
2370 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
2374 es
->s_wtime
= cpu_to_le32(get_seconds());
2375 ext4_free_blocks_count_set(es
, ext4_count_free_blocks(sb
));
2376 es
->s_free_inodes_count
= cpu_to_le32(ext4_count_free_inodes(sb
));
2377 BUFFER_TRACE(sbh
, "marking dirty");
2378 mark_buffer_dirty(sbh
);
2380 sync_dirty_buffer(sbh
);
2385 * Have we just finished recovery? If so, and if we are mounting (or
2386 * remounting) the filesystem readonly, then we will end up with a
2387 * consistent fs on disk. Record that fact.
2389 static void ext4_mark_recovery_complete(struct super_block
* sb
,
2390 struct ext4_super_block
* es
)
2392 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
2394 jbd2_journal_lock_updates(journal
);
2395 jbd2_journal_flush(journal
);
2397 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
2398 sb
->s_flags
& MS_RDONLY
) {
2399 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
2401 ext4_commit_super(sb
, es
, 1);
2404 jbd2_journal_unlock_updates(journal
);
2408 * If we are mounting (or read-write remounting) a filesystem whose journal
2409 * has recorded an error from a previous lifetime, move that error to the
2410 * main filesystem now.
2412 static void ext4_clear_journal_err(struct super_block
* sb
,
2413 struct ext4_super_block
* es
)
2419 journal
= EXT4_SB(sb
)->s_journal
;
2422 * Now check for any error status which may have been recorded in the
2423 * journal by a prior ext4_error() or ext4_abort()
2426 j_errno
= jbd2_journal_errno(journal
);
2430 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
2431 ext4_warning(sb
, __FUNCTION__
, "Filesystem error recorded "
2432 "from previous mount: %s", errstr
);
2433 ext4_warning(sb
, __FUNCTION__
, "Marking fs in need of "
2434 "filesystem check.");
2436 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
2437 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
2438 ext4_commit_super (sb
, es
, 1);
2440 jbd2_journal_clear_err(journal
);
2445 * Force the running and committing transactions to commit,
2446 * and wait on the commit.
2448 int ext4_force_commit(struct super_block
*sb
)
2453 if (sb
->s_flags
& MS_RDONLY
)
2456 journal
= EXT4_SB(sb
)->s_journal
;
2458 ret
= ext4_journal_force_commit(journal
);
2463 * Ext4 always journals updates to the superblock itself, so we don't
2464 * have to propagate any other updates to the superblock on disk at this
2465 * point. Just start an async writeback to get the buffers on their way
2468 * This implicitly triggers the writebehind on sync().
2471 static void ext4_write_super (struct super_block
* sb
)
2473 if (mutex_trylock(&sb
->s_lock
) != 0)
2478 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
2483 if (jbd2_journal_start_commit(EXT4_SB(sb
)->s_journal
, &target
)) {
2485 jbd2_log_wait_commit(EXT4_SB(sb
)->s_journal
, target
);
2491 * LVM calls this function before a (read-only) snapshot is created. This
2492 * gives us a chance to flush the journal completely and mark the fs clean.
2494 static void ext4_write_super_lockfs(struct super_block
*sb
)
2498 if (!(sb
->s_flags
& MS_RDONLY
)) {
2499 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
2501 /* Now we set up the journal barrier. */
2502 jbd2_journal_lock_updates(journal
);
2503 jbd2_journal_flush(journal
);
2505 /* Journal blocked and flushed, clear needs_recovery flag. */
2506 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
2507 ext4_commit_super(sb
, EXT4_SB(sb
)->s_es
, 1);
2512 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2513 * flag here, even though the filesystem is not technically dirty yet.
2515 static void ext4_unlockfs(struct super_block
*sb
)
2517 if (!(sb
->s_flags
& MS_RDONLY
)) {
2519 /* Reser the needs_recovery flag before the fs is unlocked. */
2520 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
2521 ext4_commit_super(sb
, EXT4_SB(sb
)->s_es
, 1);
2523 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
2527 static int ext4_remount (struct super_block
* sb
, int * flags
, char * data
)
2529 struct ext4_super_block
* es
;
2530 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2531 ext4_fsblk_t n_blocks_count
= 0;
2532 unsigned long old_sb_flags
;
2533 struct ext4_mount_options old_opts
;
2539 /* Store the original options */
2540 old_sb_flags
= sb
->s_flags
;
2541 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
2542 old_opts
.s_resuid
= sbi
->s_resuid
;
2543 old_opts
.s_resgid
= sbi
->s_resgid
;
2544 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
2546 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
2547 for (i
= 0; i
< MAXQUOTAS
; i
++)
2548 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
2552 * Allow the "check" option to be passed as a remount option.
2554 if (!parse_options(data
, sb
, NULL
, NULL
, &n_blocks_count
, 1)) {
2559 if (sbi
->s_mount_opt
& EXT4_MOUNT_ABORT
)
2560 ext4_abort(sb
, __FUNCTION__
, "Abort forced by user");
2562 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
2563 ((sbi
->s_mount_opt
& EXT4_MOUNT_POSIX_ACL
) ? MS_POSIXACL
: 0);
2567 ext4_init_journal_params(sb
, sbi
->s_journal
);
2569 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
) ||
2570 n_blocks_count
> ext4_blocks_count(es
)) {
2571 if (sbi
->s_mount_opt
& EXT4_MOUNT_ABORT
) {
2576 if (*flags
& MS_RDONLY
) {
2578 * First of all, the unconditional stuff we have to do
2579 * to disable replay of the journal when we next remount
2581 sb
->s_flags
|= MS_RDONLY
;
2584 * OK, test if we are remounting a valid rw partition
2585 * readonly, and if so set the rdonly flag and then
2586 * mark the partition as valid again.
2588 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
2589 (sbi
->s_mount_state
& EXT4_VALID_FS
))
2590 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
2593 * We have to unlock super so that we can wait for
2597 ext4_mark_recovery_complete(sb
, es
);
2601 if ((ret
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2602 ~EXT4_FEATURE_RO_COMPAT_SUPP
))) {
2603 printk(KERN_WARNING
"EXT4-fs: %s: couldn't "
2604 "remount RDWR because of unsupported "
2605 "optional features (%x).\n",
2606 sb
->s_id
, le32_to_cpu(ret
));
2612 * If we have an unprocessed orphan list hanging
2613 * around from a previously readonly bdev mount,
2614 * require a full umount/remount for now.
2616 if (es
->s_last_orphan
) {
2617 printk(KERN_WARNING
"EXT4-fs: %s: couldn't "
2618 "remount RDWR because of unprocessed "
2619 "orphan inode list. Please "
2620 "umount/remount instead.\n",
2627 * Mounting a RDONLY partition read-write, so reread
2628 * and store the current valid flag. (It may have
2629 * been changed by e2fsck since we originally mounted
2632 ext4_clear_journal_err(sb
, es
);
2633 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
2634 if ((err
= ext4_group_extend(sb
, es
, n_blocks_count
)))
2636 if (!ext4_setup_super (sb
, es
, 0))
2637 sb
->s_flags
&= ~MS_RDONLY
;
2641 /* Release old quota file names */
2642 for (i
= 0; i
< MAXQUOTAS
; i
++)
2643 if (old_opts
.s_qf_names
[i
] &&
2644 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
2645 kfree(old_opts
.s_qf_names
[i
]);
2649 sb
->s_flags
= old_sb_flags
;
2650 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
2651 sbi
->s_resuid
= old_opts
.s_resuid
;
2652 sbi
->s_resgid
= old_opts
.s_resgid
;
2653 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
2655 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
2656 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2657 if (sbi
->s_qf_names
[i
] &&
2658 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
2659 kfree(sbi
->s_qf_names
[i
]);
2660 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
2666 static int ext4_statfs (struct dentry
* dentry
, struct kstatfs
* buf
)
2668 struct super_block
*sb
= dentry
->d_sb
;
2669 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2670 struct ext4_super_block
*es
= sbi
->s_es
;
2673 if (test_opt(sb
, MINIX_DF
)) {
2674 sbi
->s_overhead_last
= 0;
2675 } else if (sbi
->s_blocks_last
!= ext4_blocks_count(es
)) {
2676 unsigned long ngroups
= sbi
->s_groups_count
, i
;
2677 ext4_fsblk_t overhead
= 0;
2681 * Compute the overhead (FS structures). This is constant
2682 * for a given filesystem unless the number of block groups
2683 * changes so we cache the previous value until it does.
2687 * All of the blocks before first_data_block are
2690 overhead
= le32_to_cpu(es
->s_first_data_block
);
2693 * Add the overhead attributed to the superblock and
2694 * block group descriptors. If the sparse superblocks
2695 * feature is turned on, then not all groups have this.
2697 for (i
= 0; i
< ngroups
; i
++) {
2698 overhead
+= ext4_bg_has_super(sb
, i
) +
2699 ext4_bg_num_gdb(sb
, i
);
2704 * Every block group has an inode bitmap, a block
2705 * bitmap, and an inode table.
2707 overhead
+= ngroups
* (2 + sbi
->s_itb_per_group
);
2708 sbi
->s_overhead_last
= overhead
;
2710 sbi
->s_blocks_last
= ext4_blocks_count(es
);
2713 buf
->f_type
= EXT4_SUPER_MAGIC
;
2714 buf
->f_bsize
= sb
->s_blocksize
;
2715 buf
->f_blocks
= ext4_blocks_count(es
) - sbi
->s_overhead_last
;
2716 buf
->f_bfree
= percpu_counter_sum_positive(&sbi
->s_freeblocks_counter
);
2717 ext4_free_blocks_count_set(es
, buf
->f_bfree
);
2718 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
2719 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
2721 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
2722 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
2723 es
->s_free_inodes_count
= cpu_to_le32(buf
->f_ffree
);
2724 buf
->f_namelen
= EXT4_NAME_LEN
;
2725 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
2726 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
2727 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
2728 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
2732 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2733 * is locked for write. Otherwise the are possible deadlocks:
2734 * Process 1 Process 2
2735 * ext4_create() quota_sync()
2736 * jbd2_journal_start() write_dquot()
2737 * DQUOT_INIT() down(dqio_mutex)
2738 * down(dqio_mutex) jbd2_journal_start()
2744 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
2746 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_type
];
2749 static int ext4_dquot_initialize(struct inode
*inode
, int type
)
2754 /* We may create quota structure so we need to reserve enough blocks */
2755 handle
= ext4_journal_start(inode
, 2*EXT4_QUOTA_INIT_BLOCKS(inode
->i_sb
));
2757 return PTR_ERR(handle
);
2758 ret
= dquot_initialize(inode
, type
);
2759 err
= ext4_journal_stop(handle
);
2765 static int ext4_dquot_drop(struct inode
*inode
)
2770 /* We may delete quota structure so we need to reserve enough blocks */
2771 handle
= ext4_journal_start(inode
, 2*EXT4_QUOTA_DEL_BLOCKS(inode
->i_sb
));
2773 return PTR_ERR(handle
);
2774 ret
= dquot_drop(inode
);
2775 err
= ext4_journal_stop(handle
);
2781 static int ext4_write_dquot(struct dquot
*dquot
)
2785 struct inode
*inode
;
2787 inode
= dquot_to_inode(dquot
);
2788 handle
= ext4_journal_start(inode
,
2789 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
2791 return PTR_ERR(handle
);
2792 ret
= dquot_commit(dquot
);
2793 err
= ext4_journal_stop(handle
);
2799 static int ext4_acquire_dquot(struct dquot
*dquot
)
2804 handle
= ext4_journal_start(dquot_to_inode(dquot
),
2805 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
2807 return PTR_ERR(handle
);
2808 ret
= dquot_acquire(dquot
);
2809 err
= ext4_journal_stop(handle
);
2815 static int ext4_release_dquot(struct dquot
*dquot
)
2820 handle
= ext4_journal_start(dquot_to_inode(dquot
),
2821 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
2822 if (IS_ERR(handle
)) {
2823 /* Release dquot anyway to avoid endless cycle in dqput() */
2824 dquot_release(dquot
);
2825 return PTR_ERR(handle
);
2827 ret
= dquot_release(dquot
);
2828 err
= ext4_journal_stop(handle
);
2834 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
2836 /* Are we journalling quotas? */
2837 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
2838 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
2839 dquot_mark_dquot_dirty(dquot
);
2840 return ext4_write_dquot(dquot
);
2842 return dquot_mark_dquot_dirty(dquot
);
2846 static int ext4_write_info(struct super_block
*sb
, int type
)
2851 /* Data block + inode block */
2852 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
2854 return PTR_ERR(handle
);
2855 ret
= dquot_commit_info(sb
, type
);
2856 err
= ext4_journal_stop(handle
);
2863 * Turn on quotas during mount time - we need to find
2864 * the quota file and such...
2866 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
2868 return vfs_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
2869 EXT4_SB(sb
)->s_jquota_fmt
, type
);
2873 * Standard function to be called on quota_on
2875 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
2879 struct nameidata nd
;
2881 if (!test_opt(sb
, QUOTA
))
2883 /* Not journalling quota? */
2884 if (!EXT4_SB(sb
)->s_qf_names
[USRQUOTA
] &&
2885 !EXT4_SB(sb
)->s_qf_names
[GRPQUOTA
])
2886 return vfs_quota_on(sb
, type
, format_id
, path
);
2887 err
= path_lookup(path
, LOOKUP_FOLLOW
, &nd
);
2890 /* Quotafile not on the same filesystem? */
2891 if (nd
.mnt
->mnt_sb
!= sb
) {
2895 /* Quotafile not of fs root? */
2896 if (nd
.dentry
->d_parent
->d_inode
!= sb
->s_root
->d_inode
)
2898 "EXT4-fs: Quota file not on filesystem root. "
2899 "Journalled quota will not work.\n");
2901 return vfs_quota_on(sb
, type
, format_id
, path
);
2904 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2905 * acquiring the locks... As quota files are never truncated and quota code
2906 * itself serializes the operations (and noone else should touch the files)
2907 * we don't have to be afraid of races */
2908 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
2909 size_t len
, loff_t off
)
2911 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
2912 sector_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
2914 int offset
= off
& (sb
->s_blocksize
- 1);
2917 struct buffer_head
*bh
;
2918 loff_t i_size
= i_size_read(inode
);
2922 if (off
+len
> i_size
)
2925 while (toread
> 0) {
2926 tocopy
= sb
->s_blocksize
- offset
< toread
?
2927 sb
->s_blocksize
- offset
: toread
;
2928 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
2931 if (!bh
) /* A hole? */
2932 memset(data
, 0, tocopy
);
2934 memcpy(data
, bh
->b_data
+offset
, tocopy
);
2944 /* Write to quotafile (we know the transaction is already started and has
2945 * enough credits) */
2946 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
2947 const char *data
, size_t len
, loff_t off
)
2949 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
2950 sector_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
2952 int offset
= off
& (sb
->s_blocksize
- 1);
2954 int journal_quota
= EXT4_SB(sb
)->s_qf_names
[type
] != NULL
;
2955 size_t towrite
= len
;
2956 struct buffer_head
*bh
;
2957 handle_t
*handle
= journal_current_handle();
2960 printk(KERN_WARNING
"EXT4-fs: Quota write (off=%Lu, len=%Lu)"
2961 " cancelled because transaction is not started.\n",
2962 (unsigned long long)off
, (unsigned long long)len
);
2965 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
2966 while (towrite
> 0) {
2967 tocopy
= sb
->s_blocksize
- offset
< towrite
?
2968 sb
->s_blocksize
- offset
: towrite
;
2969 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
2972 if (journal_quota
) {
2973 err
= ext4_journal_get_write_access(handle
, bh
);
2980 memcpy(bh
->b_data
+offset
, data
, tocopy
);
2981 flush_dcache_page(bh
->b_page
);
2984 err
= ext4_journal_dirty_metadata(handle
, bh
);
2986 /* Always do at least ordered writes for quotas */
2987 err
= ext4_journal_dirty_data(handle
, bh
);
2988 mark_buffer_dirty(bh
);
3001 if (inode
->i_size
< off
+len
-towrite
) {
3002 i_size_write(inode
, off
+len
-towrite
);
3003 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
3006 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
3007 ext4_mark_inode_dirty(handle
, inode
);
3008 mutex_unlock(&inode
->i_mutex
);
3009 return len
- towrite
;
3014 static int ext4_get_sb(struct file_system_type
*fs_type
,
3015 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
3017 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
, mnt
);
3020 static struct file_system_type ext4dev_fs_type
= {
3021 .owner
= THIS_MODULE
,
3023 .get_sb
= ext4_get_sb
,
3024 .kill_sb
= kill_block_super
,
3025 .fs_flags
= FS_REQUIRES_DEV
,
3028 static int __init
init_ext4_fs(void)
3030 int err
= init_ext4_xattr();
3033 err
= init_inodecache();
3036 err
= register_filesystem(&ext4dev_fs_type
);
3041 destroy_inodecache();
3047 static void __exit
exit_ext4_fs(void)
3049 unregister_filesystem(&ext4dev_fs_type
);
3050 destroy_inodecache();
3054 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3055 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
3056 MODULE_LICENSE("GPL");
3057 module_init(init_ext4_fs
)
3058 module_exit(exit_ext4_fs
)