2 * linux/fs/ext4/super.c
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
11 * linux/fs/minix/inode.c
13 * Copyright (C) 1991, 1992 Linus Torvalds
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
19 #include <linux/module.h>
20 #include <linux/string.h>
22 #include <linux/time.h>
23 #include <linux/vmalloc.h>
24 #include <linux/jbd2.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/blkdev.h>
28 #include <linux/parser.h>
29 #include <linux/smp_lock.h>
30 #include <linux/buffer_head.h>
31 #include <linux/exportfs.h>
32 #include <linux/vfs.h>
33 #include <linux/random.h>
34 #include <linux/mount.h>
35 #include <linux/namei.h>
36 #include <linux/quotaops.h>
37 #include <linux/seq_file.h>
38 #include <linux/proc_fs.h>
39 #include <linux/ctype.h>
40 #include <linux/log2.h>
41 #include <linux/crc16.h>
42 #include <asm/uaccess.h>
44 #include <linux/kthread.h>
45 #include <linux/freezer.h>
48 #include "ext4_jbd2.h"
53 #define CREATE_TRACE_POINTS
54 #include <trace/events/ext4.h>
56 struct proc_dir_entry
*ext4_proc_root
;
57 static struct kset
*ext4_kset
;
58 struct ext4_lazy_init
*ext4_li_info
;
59 struct mutex ext4_li_mtx
;
60 struct ext4_features
*ext4_feat
;
62 static int ext4_load_journal(struct super_block
*, struct ext4_super_block
*,
63 unsigned long journal_devnum
);
64 static int ext4_commit_super(struct super_block
*sb
, int sync
);
65 static void ext4_mark_recovery_complete(struct super_block
*sb
,
66 struct ext4_super_block
*es
);
67 static void ext4_clear_journal_err(struct super_block
*sb
,
68 struct ext4_super_block
*es
);
69 static int ext4_sync_fs(struct super_block
*sb
, int wait
);
70 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
72 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
);
73 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
);
74 static int ext4_unfreeze(struct super_block
*sb
);
75 static void ext4_write_super(struct super_block
*sb
);
76 static int ext4_freeze(struct super_block
*sb
);
77 static int ext4_get_sb(struct file_system_type
*fs_type
, int flags
,
78 const char *dev_name
, void *data
, struct vfsmount
*mnt
);
79 static void ext4_destroy_lazyinit_thread(void);
80 static void ext4_unregister_li_request(struct super_block
*sb
);
82 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
83 static struct file_system_type ext3_fs_type
= {
86 .get_sb
= ext4_get_sb
,
87 .kill_sb
= kill_block_super
,
88 .fs_flags
= FS_REQUIRES_DEV
,
90 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
92 #define IS_EXT3_SB(sb) (0)
95 ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
96 struct ext4_group_desc
*bg
)
98 return le32_to_cpu(bg
->bg_block_bitmap_lo
) |
99 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
100 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
103 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
104 struct ext4_group_desc
*bg
)
106 return le32_to_cpu(bg
->bg_inode_bitmap_lo
) |
107 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
108 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
111 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
112 struct ext4_group_desc
*bg
)
114 return le32_to_cpu(bg
->bg_inode_table_lo
) |
115 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
116 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
119 __u32
ext4_free_blks_count(struct super_block
*sb
,
120 struct ext4_group_desc
*bg
)
122 return le16_to_cpu(bg
->bg_free_blocks_count_lo
) |
123 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
124 (__u32
)le16_to_cpu(bg
->bg_free_blocks_count_hi
) << 16 : 0);
127 __u32
ext4_free_inodes_count(struct super_block
*sb
,
128 struct ext4_group_desc
*bg
)
130 return le16_to_cpu(bg
->bg_free_inodes_count_lo
) |
131 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
132 (__u32
)le16_to_cpu(bg
->bg_free_inodes_count_hi
) << 16 : 0);
135 __u32
ext4_used_dirs_count(struct super_block
*sb
,
136 struct ext4_group_desc
*bg
)
138 return le16_to_cpu(bg
->bg_used_dirs_count_lo
) |
139 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
140 (__u32
)le16_to_cpu(bg
->bg_used_dirs_count_hi
) << 16 : 0);
143 __u32
ext4_itable_unused_count(struct super_block
*sb
,
144 struct ext4_group_desc
*bg
)
146 return le16_to_cpu(bg
->bg_itable_unused_lo
) |
147 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
148 (__u32
)le16_to_cpu(bg
->bg_itable_unused_hi
) << 16 : 0);
151 void ext4_block_bitmap_set(struct super_block
*sb
,
152 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
154 bg
->bg_block_bitmap_lo
= cpu_to_le32((u32
)blk
);
155 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
156 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
159 void ext4_inode_bitmap_set(struct super_block
*sb
,
160 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
162 bg
->bg_inode_bitmap_lo
= cpu_to_le32((u32
)blk
);
163 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
164 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
167 void ext4_inode_table_set(struct super_block
*sb
,
168 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
170 bg
->bg_inode_table_lo
= cpu_to_le32((u32
)blk
);
171 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
172 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
175 void ext4_free_blks_set(struct super_block
*sb
,
176 struct ext4_group_desc
*bg
, __u32 count
)
178 bg
->bg_free_blocks_count_lo
= cpu_to_le16((__u16
)count
);
179 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
180 bg
->bg_free_blocks_count_hi
= cpu_to_le16(count
>> 16);
183 void ext4_free_inodes_set(struct super_block
*sb
,
184 struct ext4_group_desc
*bg
, __u32 count
)
186 bg
->bg_free_inodes_count_lo
= cpu_to_le16((__u16
)count
);
187 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
188 bg
->bg_free_inodes_count_hi
= cpu_to_le16(count
>> 16);
191 void ext4_used_dirs_set(struct super_block
*sb
,
192 struct ext4_group_desc
*bg
, __u32 count
)
194 bg
->bg_used_dirs_count_lo
= cpu_to_le16((__u16
)count
);
195 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
196 bg
->bg_used_dirs_count_hi
= cpu_to_le16(count
>> 16);
199 void ext4_itable_unused_set(struct super_block
*sb
,
200 struct ext4_group_desc
*bg
, __u32 count
)
202 bg
->bg_itable_unused_lo
= cpu_to_le16((__u16
)count
);
203 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
204 bg
->bg_itable_unused_hi
= cpu_to_le16(count
>> 16);
208 /* Just increment the non-pointer handle value */
209 static handle_t
*ext4_get_nojournal(void)
211 handle_t
*handle
= current
->journal_info
;
212 unsigned long ref_cnt
= (unsigned long)handle
;
214 BUG_ON(ref_cnt
>= EXT4_NOJOURNAL_MAX_REF_COUNT
);
217 handle
= (handle_t
*)ref_cnt
;
219 current
->journal_info
= handle
;
224 /* Decrement the non-pointer handle value */
225 static void ext4_put_nojournal(handle_t
*handle
)
227 unsigned long ref_cnt
= (unsigned long)handle
;
229 BUG_ON(ref_cnt
== 0);
232 handle
= (handle_t
*)ref_cnt
;
234 current
->journal_info
= handle
;
238 * Wrappers for jbd2_journal_start/end.
240 * The only special thing we need to do here is to make sure that all
241 * journal_end calls result in the superblock being marked dirty, so
242 * that sync() will call the filesystem's write_super callback if
245 handle_t
*ext4_journal_start_sb(struct super_block
*sb
, int nblocks
)
249 if (sb
->s_flags
& MS_RDONLY
)
250 return ERR_PTR(-EROFS
);
252 vfs_check_frozen(sb
, SB_FREEZE_TRANS
);
253 /* Special case here: if the journal has aborted behind our
254 * backs (eg. EIO in the commit thread), then we still need to
255 * take the FS itself readonly cleanly. */
256 journal
= EXT4_SB(sb
)->s_journal
;
258 if (is_journal_aborted(journal
)) {
259 ext4_abort(sb
, "Detected aborted journal");
260 return ERR_PTR(-EROFS
);
262 return jbd2_journal_start(journal
, nblocks
);
264 return ext4_get_nojournal();
268 * The only special thing we need to do here is to make sure that all
269 * jbd2_journal_stop calls result in the superblock being marked dirty, so
270 * that sync() will call the filesystem's write_super callback if
273 int __ext4_journal_stop(const char *where
, unsigned int line
, handle_t
*handle
)
275 struct super_block
*sb
;
279 if (!ext4_handle_valid(handle
)) {
280 ext4_put_nojournal(handle
);
283 sb
= handle
->h_transaction
->t_journal
->j_private
;
285 rc
= jbd2_journal_stop(handle
);
290 __ext4_std_error(sb
, where
, line
, err
);
294 void ext4_journal_abort_handle(const char *caller
, unsigned int line
,
295 const char *err_fn
, struct buffer_head
*bh
,
296 handle_t
*handle
, int err
)
299 const char *errstr
= ext4_decode_error(NULL
, err
, nbuf
);
301 BUG_ON(!ext4_handle_valid(handle
));
304 BUFFER_TRACE(bh
, "abort");
309 if (is_handle_aborted(handle
))
312 printk(KERN_ERR
"%s:%d: aborting transaction: %s in %s\n",
313 caller
, line
, errstr
, err_fn
);
315 jbd2_journal_abort_handle(handle
);
318 static void __save_error_info(struct super_block
*sb
, const char *func
,
321 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
323 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
324 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
325 es
->s_last_error_time
= cpu_to_le32(get_seconds());
326 strncpy(es
->s_last_error_func
, func
, sizeof(es
->s_last_error_func
));
327 es
->s_last_error_line
= cpu_to_le32(line
);
328 if (!es
->s_first_error_time
) {
329 es
->s_first_error_time
= es
->s_last_error_time
;
330 strncpy(es
->s_first_error_func
, func
,
331 sizeof(es
->s_first_error_func
));
332 es
->s_first_error_line
= cpu_to_le32(line
);
333 es
->s_first_error_ino
= es
->s_last_error_ino
;
334 es
->s_first_error_block
= es
->s_last_error_block
;
337 * Start the daily error reporting function if it hasn't been
340 if (!es
->s_error_count
)
341 mod_timer(&EXT4_SB(sb
)->s_err_report
, jiffies
+ 24*60*60*HZ
);
342 es
->s_error_count
= cpu_to_le32(le32_to_cpu(es
->s_error_count
) + 1);
345 static void save_error_info(struct super_block
*sb
, const char *func
,
348 __save_error_info(sb
, func
, line
);
349 ext4_commit_super(sb
, 1);
353 /* Deal with the reporting of failure conditions on a filesystem such as
354 * inconsistencies detected or read IO failures.
356 * On ext2, we can store the error state of the filesystem in the
357 * superblock. That is not possible on ext4, because we may have other
358 * write ordering constraints on the superblock which prevent us from
359 * writing it out straight away; and given that the journal is about to
360 * be aborted, we can't rely on the current, or future, transactions to
361 * write out the superblock safely.
363 * We'll just use the jbd2_journal_abort() error code to record an error in
364 * the journal instead. On recovery, the journal will complain about
365 * that error until we've noted it down and cleared it.
368 static void ext4_handle_error(struct super_block
*sb
)
370 if (sb
->s_flags
& MS_RDONLY
)
373 if (!test_opt(sb
, ERRORS_CONT
)) {
374 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
376 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
378 jbd2_journal_abort(journal
, -EIO
);
380 if (test_opt(sb
, ERRORS_RO
)) {
381 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
382 sb
->s_flags
|= MS_RDONLY
;
384 if (test_opt(sb
, ERRORS_PANIC
))
385 panic("EXT4-fs (device %s): panic forced after error\n",
389 void __ext4_error(struct super_block
*sb
, const char *function
,
390 unsigned int line
, const char *fmt
, ...)
395 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: comm %s: ",
396 sb
->s_id
, function
, line
, current
->comm
);
401 ext4_handle_error(sb
);
404 void ext4_error_inode(struct inode
*inode
, const char *function
,
405 unsigned int line
, ext4_fsblk_t block
,
406 const char *fmt
, ...)
409 struct ext4_super_block
*es
= EXT4_SB(inode
->i_sb
)->s_es
;
411 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
412 es
->s_last_error_block
= cpu_to_le64(block
);
413 save_error_info(inode
->i_sb
, function
, line
);
415 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: inode #%lu: ",
416 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
);
418 printk("block %llu: ", block
);
419 printk("comm %s: ", current
->comm
);
424 ext4_handle_error(inode
->i_sb
);
427 void ext4_error_file(struct file
*file
, const char *function
,
428 unsigned int line
, const char *fmt
, ...)
431 struct ext4_super_block
*es
;
432 struct inode
*inode
= file
->f_dentry
->d_inode
;
433 char pathname
[80], *path
;
435 es
= EXT4_SB(inode
->i_sb
)->s_es
;
436 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
437 save_error_info(inode
->i_sb
, function
, line
);
439 path
= d_path(&(file
->f_path
), pathname
, sizeof(pathname
));
443 "EXT4-fs error (device %s): %s:%d: inode #%lu "
444 "(comm %s path %s): ",
445 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
446 current
->comm
, path
);
451 ext4_handle_error(inode
->i_sb
);
454 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
461 errstr
= "IO failure";
464 errstr
= "Out of memory";
467 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
468 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
469 errstr
= "Journal has aborted";
471 errstr
= "Readonly filesystem";
474 /* If the caller passed in an extra buffer for unknown
475 * errors, textualise them now. Else we just return
478 /* Check for truncated error codes... */
479 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
488 /* __ext4_std_error decodes expected errors from journaling functions
489 * automatically and invokes the appropriate error response. */
491 void __ext4_std_error(struct super_block
*sb
, const char *function
,
492 unsigned int line
, int errno
)
497 /* Special case: if the error is EROFS, and we're not already
498 * inside a transaction, then there's really no point in logging
500 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
501 (sb
->s_flags
& MS_RDONLY
))
504 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
505 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s:%d: %s\n",
506 sb
->s_id
, function
, line
, errstr
);
507 save_error_info(sb
, function
, line
);
509 ext4_handle_error(sb
);
513 * ext4_abort is a much stronger failure handler than ext4_error. The
514 * abort function may be used to deal with unrecoverable failures such
515 * as journal IO errors or ENOMEM at a critical moment in log management.
517 * We unconditionally force the filesystem into an ABORT|READONLY state,
518 * unless the error response on the fs has been set to panic in which
519 * case we take the easy way out and panic immediately.
522 void __ext4_abort(struct super_block
*sb
, const char *function
,
523 unsigned int line
, const char *fmt
, ...)
527 save_error_info(sb
, function
, line
);
529 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: ", sb
->s_id
,
535 if ((sb
->s_flags
& MS_RDONLY
) == 0) {
536 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
537 sb
->s_flags
|= MS_RDONLY
;
538 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
539 if (EXT4_SB(sb
)->s_journal
)
540 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
541 save_error_info(sb
, function
, line
);
543 if (test_opt(sb
, ERRORS_PANIC
))
544 panic("EXT4-fs panic from previous error\n");
547 void ext4_msg (struct super_block
* sb
, const char *prefix
,
548 const char *fmt
, ...)
553 printk("%sEXT4-fs (%s): ", prefix
, sb
->s_id
);
559 void __ext4_warning(struct super_block
*sb
, const char *function
,
560 unsigned int line
, const char *fmt
, ...)
565 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: ",
566 sb
->s_id
, function
, line
);
572 void __ext4_grp_locked_error(const char *function
, unsigned int line
,
573 struct super_block
*sb
, ext4_group_t grp
,
574 unsigned long ino
, ext4_fsblk_t block
,
575 const char *fmt
, ...)
580 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
582 es
->s_last_error_ino
= cpu_to_le32(ino
);
583 es
->s_last_error_block
= cpu_to_le64(block
);
584 __save_error_info(sb
, function
, line
);
586 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: group %u",
587 sb
->s_id
, function
, line
, grp
);
589 printk("inode %lu: ", ino
);
591 printk("block %llu:", (unsigned long long) block
);
596 if (test_opt(sb
, ERRORS_CONT
)) {
597 ext4_commit_super(sb
, 0);
601 ext4_unlock_group(sb
, grp
);
602 ext4_handle_error(sb
);
604 * We only get here in the ERRORS_RO case; relocking the group
605 * may be dangerous, but nothing bad will happen since the
606 * filesystem will have already been marked read/only and the
607 * journal has been aborted. We return 1 as a hint to callers
608 * who might what to use the return value from
609 * ext4_grp_locked_error() to distinguish beween the
610 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
611 * aggressively from the ext4 function in question, with a
612 * more appropriate error code.
614 ext4_lock_group(sb
, grp
);
618 void ext4_update_dynamic_rev(struct super_block
*sb
)
620 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
622 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
626 "updating to rev %d because of new feature flag, "
627 "running e2fsck is recommended",
630 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
631 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
632 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
633 /* leave es->s_feature_*compat flags alone */
634 /* es->s_uuid will be set by e2fsck if empty */
637 * The rest of the superblock fields should be zero, and if not it
638 * means they are likely already in use, so leave them alone. We
639 * can leave it up to e2fsck to clean up any inconsistencies there.
644 * Open the external journal device
646 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
648 struct block_device
*bdev
;
649 char b
[BDEVNAME_SIZE
];
651 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
657 ext4_msg(sb
, KERN_ERR
, "failed to open journal device %s: %ld",
658 __bdevname(dev
, b
), PTR_ERR(bdev
));
663 * Release the journal device
665 static int ext4_blkdev_put(struct block_device
*bdev
)
668 return blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
671 static int ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
673 struct block_device
*bdev
;
676 bdev
= sbi
->journal_bdev
;
678 ret
= ext4_blkdev_put(bdev
);
679 sbi
->journal_bdev
= NULL
;
684 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
686 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
689 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
693 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
694 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
696 printk(KERN_ERR
"sb_info orphan list:\n");
697 list_for_each(l
, &sbi
->s_orphan
) {
698 struct inode
*inode
= orphan_list_entry(l
);
700 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
701 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
702 inode
->i_mode
, inode
->i_nlink
,
707 static void ext4_put_super(struct super_block
*sb
)
709 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
710 struct ext4_super_block
*es
= sbi
->s_es
;
713 ext4_unregister_li_request(sb
);
714 dquot_disable(sb
, -1, DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
716 flush_workqueue(sbi
->dio_unwritten_wq
);
717 destroy_workqueue(sbi
->dio_unwritten_wq
);
722 ext4_commit_super(sb
, 1);
724 if (sbi
->s_journal
) {
725 err
= jbd2_journal_destroy(sbi
->s_journal
);
726 sbi
->s_journal
= NULL
;
728 ext4_abort(sb
, "Couldn't clean up the journal");
731 del_timer(&sbi
->s_err_report
);
732 ext4_release_system_zone(sb
);
734 ext4_ext_release(sb
);
735 ext4_xattr_put_super(sb
);
737 if (!(sb
->s_flags
& MS_RDONLY
)) {
738 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
739 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
740 ext4_commit_super(sb
, 1);
743 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
745 kobject_del(&sbi
->s_kobj
);
747 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
748 brelse(sbi
->s_group_desc
[i
]);
749 kfree(sbi
->s_group_desc
);
750 if (is_vmalloc_addr(sbi
->s_flex_groups
))
751 vfree(sbi
->s_flex_groups
);
753 kfree(sbi
->s_flex_groups
);
754 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
755 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
756 percpu_counter_destroy(&sbi
->s_dirs_counter
);
757 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
760 for (i
= 0; i
< MAXQUOTAS
; i
++)
761 kfree(sbi
->s_qf_names
[i
]);
764 /* Debugging code just in case the in-memory inode orphan list
765 * isn't empty. The on-disk one can be non-empty if we've
766 * detected an error and taken the fs readonly, but the
767 * in-memory list had better be clean by this point. */
768 if (!list_empty(&sbi
->s_orphan
))
769 dump_orphan_list(sb
, sbi
);
770 J_ASSERT(list_empty(&sbi
->s_orphan
));
772 invalidate_bdev(sb
->s_bdev
);
773 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
775 * Invalidate the journal device's buffers. We don't want them
776 * floating about in memory - the physical journal device may
777 * hotswapped, and it breaks the `ro-after' testing code.
779 sync_blockdev(sbi
->journal_bdev
);
780 invalidate_bdev(sbi
->journal_bdev
);
781 ext4_blkdev_remove(sbi
);
783 sb
->s_fs_info
= NULL
;
785 * Now that we are completely done shutting down the
786 * superblock, we need to actually destroy the kobject.
790 kobject_put(&sbi
->s_kobj
);
791 wait_for_completion(&sbi
->s_kobj_unregister
);
792 kfree(sbi
->s_blockgroup_lock
);
796 static struct kmem_cache
*ext4_inode_cachep
;
799 * Called inside transaction, so use GFP_NOFS
801 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
803 struct ext4_inode_info
*ei
;
805 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
809 ei
->vfs_inode
.i_version
= 1;
810 ei
->vfs_inode
.i_data
.writeback_index
= 0;
811 memset(&ei
->i_cached_extent
, 0, sizeof(struct ext4_ext_cache
));
812 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
813 spin_lock_init(&ei
->i_prealloc_lock
);
815 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
816 * therefore it can be null here. Don't check it, just initialize
819 jbd2_journal_init_jbd_inode(&ei
->jinode
, &ei
->vfs_inode
);
820 ei
->i_reserved_data_blocks
= 0;
821 ei
->i_reserved_meta_blocks
= 0;
822 ei
->i_allocated_meta_blocks
= 0;
823 ei
->i_da_metadata_calc_len
= 0;
824 ei
->i_delalloc_reserved_flag
= 0;
825 spin_lock_init(&(ei
->i_block_reservation_lock
));
827 ei
->i_reserved_quota
= 0;
829 INIT_LIST_HEAD(&ei
->i_completed_io_list
);
830 spin_lock_init(&ei
->i_completed_io_lock
);
831 ei
->cur_aio_dio
= NULL
;
833 ei
->i_datasync_tid
= 0;
835 return &ei
->vfs_inode
;
838 static void ext4_destroy_inode(struct inode
*inode
)
840 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
841 ext4_msg(inode
->i_sb
, KERN_ERR
,
842 "Inode %lu (%p): orphan list check failed!",
843 inode
->i_ino
, EXT4_I(inode
));
844 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
845 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
849 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
852 static void init_once(void *foo
)
854 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
856 INIT_LIST_HEAD(&ei
->i_orphan
);
857 #ifdef CONFIG_EXT4_FS_XATTR
858 init_rwsem(&ei
->xattr_sem
);
860 init_rwsem(&ei
->i_data_sem
);
861 inode_init_once(&ei
->vfs_inode
);
864 static int init_inodecache(void)
866 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
867 sizeof(struct ext4_inode_info
),
868 0, (SLAB_RECLAIM_ACCOUNT
|
871 if (ext4_inode_cachep
== NULL
)
876 static void destroy_inodecache(void)
878 kmem_cache_destroy(ext4_inode_cachep
);
881 void ext4_clear_inode(struct inode
*inode
)
883 invalidate_inode_buffers(inode
);
884 end_writeback(inode
);
886 ext4_discard_preallocations(inode
);
887 if (EXT4_JOURNAL(inode
))
888 jbd2_journal_release_jbd_inode(EXT4_SB(inode
->i_sb
)->s_journal
,
889 &EXT4_I(inode
)->jinode
);
892 static inline void ext4_show_quota_options(struct seq_file
*seq
,
893 struct super_block
*sb
)
895 #if defined(CONFIG_QUOTA)
896 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
898 if (sbi
->s_jquota_fmt
) {
901 switch (sbi
->s_jquota_fmt
) {
912 seq_printf(seq
, ",jqfmt=%s", fmtname
);
915 if (sbi
->s_qf_names
[USRQUOTA
])
916 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
918 if (sbi
->s_qf_names
[GRPQUOTA
])
919 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
921 if (test_opt(sb
, USRQUOTA
))
922 seq_puts(seq
, ",usrquota");
924 if (test_opt(sb
, GRPQUOTA
))
925 seq_puts(seq
, ",grpquota");
931 * - it's set to a non-default value OR
932 * - if the per-sb default is different from the global default
934 static int ext4_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
937 unsigned long def_mount_opts
;
938 struct super_block
*sb
= vfs
->mnt_sb
;
939 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
940 struct ext4_super_block
*es
= sbi
->s_es
;
942 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
943 def_errors
= le16_to_cpu(es
->s_errors
);
945 if (sbi
->s_sb_block
!= 1)
946 seq_printf(seq
, ",sb=%llu", sbi
->s_sb_block
);
947 if (test_opt(sb
, MINIX_DF
))
948 seq_puts(seq
, ",minixdf");
949 if (test_opt(sb
, GRPID
) && !(def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
950 seq_puts(seq
, ",grpid");
951 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
952 seq_puts(seq
, ",nogrpid");
953 if (sbi
->s_resuid
!= EXT4_DEF_RESUID
||
954 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
) {
955 seq_printf(seq
, ",resuid=%u", sbi
->s_resuid
);
957 if (sbi
->s_resgid
!= EXT4_DEF_RESGID
||
958 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
) {
959 seq_printf(seq
, ",resgid=%u", sbi
->s_resgid
);
961 if (test_opt(sb
, ERRORS_RO
)) {
962 if (def_errors
== EXT4_ERRORS_PANIC
||
963 def_errors
== EXT4_ERRORS_CONTINUE
) {
964 seq_puts(seq
, ",errors=remount-ro");
967 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
968 seq_puts(seq
, ",errors=continue");
969 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
970 seq_puts(seq
, ",errors=panic");
971 if (test_opt(sb
, NO_UID32
) && !(def_mount_opts
& EXT4_DEFM_UID16
))
972 seq_puts(seq
, ",nouid32");
973 if (test_opt(sb
, DEBUG
) && !(def_mount_opts
& EXT4_DEFM_DEBUG
))
974 seq_puts(seq
, ",debug");
975 if (test_opt(sb
, OLDALLOC
))
976 seq_puts(seq
, ",oldalloc");
977 #ifdef CONFIG_EXT4_FS_XATTR
978 if (test_opt(sb
, XATTR_USER
) &&
979 !(def_mount_opts
& EXT4_DEFM_XATTR_USER
))
980 seq_puts(seq
, ",user_xattr");
981 if (!test_opt(sb
, XATTR_USER
) &&
982 (def_mount_opts
& EXT4_DEFM_XATTR_USER
)) {
983 seq_puts(seq
, ",nouser_xattr");
986 #ifdef CONFIG_EXT4_FS_POSIX_ACL
987 if (test_opt(sb
, POSIX_ACL
) && !(def_mount_opts
& EXT4_DEFM_ACL
))
988 seq_puts(seq
, ",acl");
989 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT4_DEFM_ACL
))
990 seq_puts(seq
, ",noacl");
992 if (sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
) {
993 seq_printf(seq
, ",commit=%u",
994 (unsigned) (sbi
->s_commit_interval
/ HZ
));
996 if (sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
) {
997 seq_printf(seq
, ",min_batch_time=%u",
998 (unsigned) sbi
->s_min_batch_time
);
1000 if (sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
) {
1001 seq_printf(seq
, ",max_batch_time=%u",
1002 (unsigned) sbi
->s_min_batch_time
);
1006 * We're changing the default of barrier mount option, so
1007 * let's always display its mount state so it's clear what its
1010 seq_puts(seq
, ",barrier=");
1011 seq_puts(seq
, test_opt(sb
, BARRIER
) ? "1" : "0");
1012 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
))
1013 seq_puts(seq
, ",journal_async_commit");
1014 else if (test_opt(sb
, JOURNAL_CHECKSUM
))
1015 seq_puts(seq
, ",journal_checksum");
1016 if (test_opt(sb
, I_VERSION
))
1017 seq_puts(seq
, ",i_version");
1018 if (!test_opt(sb
, DELALLOC
) &&
1019 !(def_mount_opts
& EXT4_DEFM_NODELALLOC
))
1020 seq_puts(seq
, ",nodelalloc");
1023 seq_printf(seq
, ",stripe=%lu", sbi
->s_stripe
);
1025 * journal mode get enabled in different ways
1026 * So just print the value even if we didn't specify it
1028 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
1029 seq_puts(seq
, ",data=journal");
1030 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
1031 seq_puts(seq
, ",data=ordered");
1032 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
1033 seq_puts(seq
, ",data=writeback");
1035 if (sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
1036 seq_printf(seq
, ",inode_readahead_blks=%u",
1037 sbi
->s_inode_readahead_blks
);
1039 if (test_opt(sb
, DATA_ERR_ABORT
))
1040 seq_puts(seq
, ",data_err=abort");
1042 if (test_opt(sb
, NO_AUTO_DA_ALLOC
))
1043 seq_puts(seq
, ",noauto_da_alloc");
1045 if (test_opt(sb
, DISCARD
) && !(def_mount_opts
& EXT4_DEFM_DISCARD
))
1046 seq_puts(seq
, ",discard");
1048 if (test_opt(sb
, NOLOAD
))
1049 seq_puts(seq
, ",norecovery");
1051 if (test_opt(sb
, DIOREAD_NOLOCK
))
1052 seq_puts(seq
, ",dioread_nolock");
1054 if (test_opt(sb
, BLOCK_VALIDITY
) &&
1055 !(def_mount_opts
& EXT4_DEFM_BLOCK_VALIDITY
))
1056 seq_puts(seq
, ",block_validity");
1058 if (!test_opt(sb
, INIT_INODE_TABLE
))
1059 seq_puts(seq
, ",noinit_inode_table");
1060 else if (sbi
->s_li_wait_mult
)
1061 seq_printf(seq
, ",init_inode_table=%u",
1062 (unsigned) sbi
->s_li_wait_mult
);
1064 ext4_show_quota_options(seq
, sb
);
1069 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
1070 u64 ino
, u32 generation
)
1072 struct inode
*inode
;
1074 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
1075 return ERR_PTR(-ESTALE
);
1076 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
1077 return ERR_PTR(-ESTALE
);
1079 /* iget isn't really right if the inode is currently unallocated!!
1081 * ext4_read_inode will return a bad_inode if the inode had been
1082 * deleted, so we should be safe.
1084 * Currently we don't know the generation for parent directory, so
1085 * a generation of 0 means "accept any"
1087 inode
= ext4_iget(sb
, ino
);
1089 return ERR_CAST(inode
);
1090 if (generation
&& inode
->i_generation
!= generation
) {
1092 return ERR_PTR(-ESTALE
);
1098 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
1099 int fh_len
, int fh_type
)
1101 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
1102 ext4_nfs_get_inode
);
1105 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
1106 int fh_len
, int fh_type
)
1108 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
1109 ext4_nfs_get_inode
);
1113 * Try to release metadata pages (indirect blocks, directories) which are
1114 * mapped via the block device. Since these pages could have journal heads
1115 * which would prevent try_to_free_buffers() from freeing them, we must use
1116 * jbd2 layer's try_to_free_buffers() function to release them.
1118 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
1121 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
1123 WARN_ON(PageChecked(page
));
1124 if (!page_has_buffers(page
))
1127 return jbd2_journal_try_to_free_buffers(journal
, page
,
1128 wait
& ~__GFP_WAIT
);
1129 return try_to_free_buffers(page
);
1133 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1134 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1136 static int ext4_write_dquot(struct dquot
*dquot
);
1137 static int ext4_acquire_dquot(struct dquot
*dquot
);
1138 static int ext4_release_dquot(struct dquot
*dquot
);
1139 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1140 static int ext4_write_info(struct super_block
*sb
, int type
);
1141 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1143 static int ext4_quota_off(struct super_block
*sb
, int type
);
1144 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1145 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1146 size_t len
, loff_t off
);
1147 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1148 const char *data
, size_t len
, loff_t off
);
1150 static const struct dquot_operations ext4_quota_operations
= {
1152 .get_reserved_space
= ext4_get_reserved_space
,
1154 .write_dquot
= ext4_write_dquot
,
1155 .acquire_dquot
= ext4_acquire_dquot
,
1156 .release_dquot
= ext4_release_dquot
,
1157 .mark_dirty
= ext4_mark_dquot_dirty
,
1158 .write_info
= ext4_write_info
,
1159 .alloc_dquot
= dquot_alloc
,
1160 .destroy_dquot
= dquot_destroy
,
1163 static const struct quotactl_ops ext4_qctl_operations
= {
1164 .quota_on
= ext4_quota_on
,
1165 .quota_off
= ext4_quota_off
,
1166 .quota_sync
= dquot_quota_sync
,
1167 .get_info
= dquot_get_dqinfo
,
1168 .set_info
= dquot_set_dqinfo
,
1169 .get_dqblk
= dquot_get_dqblk
,
1170 .set_dqblk
= dquot_set_dqblk
1174 static const struct super_operations ext4_sops
= {
1175 .alloc_inode
= ext4_alloc_inode
,
1176 .destroy_inode
= ext4_destroy_inode
,
1177 .write_inode
= ext4_write_inode
,
1178 .dirty_inode
= ext4_dirty_inode
,
1179 .evict_inode
= ext4_evict_inode
,
1180 .put_super
= ext4_put_super
,
1181 .sync_fs
= ext4_sync_fs
,
1182 .freeze_fs
= ext4_freeze
,
1183 .unfreeze_fs
= ext4_unfreeze
,
1184 .statfs
= ext4_statfs
,
1185 .remount_fs
= ext4_remount
,
1186 .show_options
= ext4_show_options
,
1188 .quota_read
= ext4_quota_read
,
1189 .quota_write
= ext4_quota_write
,
1191 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1192 .trim_fs
= ext4_trim_fs
1195 static const struct super_operations ext4_nojournal_sops
= {
1196 .alloc_inode
= ext4_alloc_inode
,
1197 .destroy_inode
= ext4_destroy_inode
,
1198 .write_inode
= ext4_write_inode
,
1199 .dirty_inode
= ext4_dirty_inode
,
1200 .evict_inode
= ext4_evict_inode
,
1201 .write_super
= ext4_write_super
,
1202 .put_super
= ext4_put_super
,
1203 .statfs
= ext4_statfs
,
1204 .remount_fs
= ext4_remount
,
1205 .show_options
= ext4_show_options
,
1207 .quota_read
= ext4_quota_read
,
1208 .quota_write
= ext4_quota_write
,
1210 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1213 static const struct export_operations ext4_export_ops
= {
1214 .fh_to_dentry
= ext4_fh_to_dentry
,
1215 .fh_to_parent
= ext4_fh_to_parent
,
1216 .get_parent
= ext4_get_parent
,
1220 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1221 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1222 Opt_nouid32
, Opt_debug
, Opt_oldalloc
, Opt_orlov
,
1223 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1224 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
, Opt_nobh
, Opt_bh
,
1225 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
,
1226 Opt_journal_update
, Opt_journal_dev
,
1227 Opt_journal_checksum
, Opt_journal_async_commit
,
1228 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1229 Opt_data_err_abort
, Opt_data_err_ignore
,
1230 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1231 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1232 Opt_noquota
, Opt_ignore
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1233 Opt_resize
, Opt_usrquota
, Opt_grpquota
, Opt_i_version
,
1234 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
,
1235 Opt_block_validity
, Opt_noblock_validity
,
1236 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1237 Opt_dioread_nolock
, Opt_dioread_lock
,
1238 Opt_discard
, Opt_nodiscard
,
1239 Opt_init_inode_table
, Opt_noinit_inode_table
,
1242 static const match_table_t tokens
= {
1243 {Opt_bsd_df
, "bsddf"},
1244 {Opt_minix_df
, "minixdf"},
1245 {Opt_grpid
, "grpid"},
1246 {Opt_grpid
, "bsdgroups"},
1247 {Opt_nogrpid
, "nogrpid"},
1248 {Opt_nogrpid
, "sysvgroups"},
1249 {Opt_resgid
, "resgid=%u"},
1250 {Opt_resuid
, "resuid=%u"},
1252 {Opt_err_cont
, "errors=continue"},
1253 {Opt_err_panic
, "errors=panic"},
1254 {Opt_err_ro
, "errors=remount-ro"},
1255 {Opt_nouid32
, "nouid32"},
1256 {Opt_debug
, "debug"},
1257 {Opt_oldalloc
, "oldalloc"},
1258 {Opt_orlov
, "orlov"},
1259 {Opt_user_xattr
, "user_xattr"},
1260 {Opt_nouser_xattr
, "nouser_xattr"},
1262 {Opt_noacl
, "noacl"},
1263 {Opt_noload
, "noload"},
1264 {Opt_noload
, "norecovery"},
1267 {Opt_commit
, "commit=%u"},
1268 {Opt_min_batch_time
, "min_batch_time=%u"},
1269 {Opt_max_batch_time
, "max_batch_time=%u"},
1270 {Opt_journal_update
, "journal=update"},
1271 {Opt_journal_dev
, "journal_dev=%u"},
1272 {Opt_journal_checksum
, "journal_checksum"},
1273 {Opt_journal_async_commit
, "journal_async_commit"},
1274 {Opt_abort
, "abort"},
1275 {Opt_data_journal
, "data=journal"},
1276 {Opt_data_ordered
, "data=ordered"},
1277 {Opt_data_writeback
, "data=writeback"},
1278 {Opt_data_err_abort
, "data_err=abort"},
1279 {Opt_data_err_ignore
, "data_err=ignore"},
1280 {Opt_offusrjquota
, "usrjquota="},
1281 {Opt_usrjquota
, "usrjquota=%s"},
1282 {Opt_offgrpjquota
, "grpjquota="},
1283 {Opt_grpjquota
, "grpjquota=%s"},
1284 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1285 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1286 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1287 {Opt_grpquota
, "grpquota"},
1288 {Opt_noquota
, "noquota"},
1289 {Opt_quota
, "quota"},
1290 {Opt_usrquota
, "usrquota"},
1291 {Opt_barrier
, "barrier=%u"},
1292 {Opt_barrier
, "barrier"},
1293 {Opt_nobarrier
, "nobarrier"},
1294 {Opt_i_version
, "i_version"},
1295 {Opt_stripe
, "stripe=%u"},
1296 {Opt_resize
, "resize"},
1297 {Opt_delalloc
, "delalloc"},
1298 {Opt_nodelalloc
, "nodelalloc"},
1299 {Opt_block_validity
, "block_validity"},
1300 {Opt_noblock_validity
, "noblock_validity"},
1301 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1302 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1303 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1304 {Opt_auto_da_alloc
, "auto_da_alloc"},
1305 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1306 {Opt_dioread_nolock
, "dioread_nolock"},
1307 {Opt_dioread_lock
, "dioread_lock"},
1308 {Opt_discard
, "discard"},
1309 {Opt_nodiscard
, "nodiscard"},
1310 {Opt_init_inode_table
, "init_itable=%u"},
1311 {Opt_init_inode_table
, "init_itable"},
1312 {Opt_noinit_inode_table
, "noinit_itable"},
1316 static ext4_fsblk_t
get_sb_block(void **data
)
1318 ext4_fsblk_t sb_block
;
1319 char *options
= (char *) *data
;
1321 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1322 return 1; /* Default location */
1325 /* TODO: use simple_strtoll with >32bit ext4 */
1326 sb_block
= simple_strtoul(options
, &options
, 0);
1327 if (*options
&& *options
!= ',') {
1328 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1332 if (*options
== ',')
1334 *data
= (void *) options
;
1339 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1340 static char deprecated_msg
[] = "Mount option \"%s\" will be removed by %s\n"
1341 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1344 static int set_qf_name(struct super_block
*sb
, int qtype
, substring_t
*args
)
1346 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1349 if (sb_any_quota_loaded(sb
) &&
1350 !sbi
->s_qf_names
[qtype
]) {
1351 ext4_msg(sb
, KERN_ERR
,
1352 "Cannot change journaled "
1353 "quota options when quota turned on");
1356 qname
= match_strdup(args
);
1358 ext4_msg(sb
, KERN_ERR
,
1359 "Not enough memory for storing quotafile name");
1362 if (sbi
->s_qf_names
[qtype
] &&
1363 strcmp(sbi
->s_qf_names
[qtype
], qname
)) {
1364 ext4_msg(sb
, KERN_ERR
,
1365 "%s quota file already specified", QTYPE2NAME(qtype
));
1369 sbi
->s_qf_names
[qtype
] = qname
;
1370 if (strchr(sbi
->s_qf_names
[qtype
], '/')) {
1371 ext4_msg(sb
, KERN_ERR
,
1372 "quotafile must be on filesystem root");
1373 kfree(sbi
->s_qf_names
[qtype
]);
1374 sbi
->s_qf_names
[qtype
] = NULL
;
1377 set_opt(sbi
->s_mount_opt
, QUOTA
);
1381 static int clear_qf_name(struct super_block
*sb
, int qtype
)
1384 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1386 if (sb_any_quota_loaded(sb
) &&
1387 sbi
->s_qf_names
[qtype
]) {
1388 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled quota options"
1389 " when quota turned on");
1393 * The space will be released later when all options are confirmed
1396 sbi
->s_qf_names
[qtype
] = NULL
;
1401 static int parse_options(char *options
, struct super_block
*sb
,
1402 unsigned long *journal_devnum
,
1403 unsigned int *journal_ioprio
,
1404 ext4_fsblk_t
*n_blocks_count
, int is_remount
)
1406 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1408 substring_t args
[MAX_OPT_ARGS
];
1418 while ((p
= strsep(&options
, ",")) != NULL
) {
1424 * Initialize args struct so we know whether arg was
1425 * found; some options take optional arguments.
1427 args
[0].to
= args
[0].from
= 0;
1428 token
= match_token(p
, tokens
, args
);
1431 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1432 clear_opt(sbi
->s_mount_opt
, MINIX_DF
);
1435 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1436 set_opt(sbi
->s_mount_opt
, MINIX_DF
);
1440 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1441 set_opt(sbi
->s_mount_opt
, GRPID
);
1445 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1446 clear_opt(sbi
->s_mount_opt
, GRPID
);
1450 if (match_int(&args
[0], &option
))
1452 sbi
->s_resuid
= option
;
1455 if (match_int(&args
[0], &option
))
1457 sbi
->s_resgid
= option
;
1460 /* handled by get_sb_block() instead of here */
1461 /* *sb_block = match_int(&args[0]); */
1464 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1465 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1466 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1469 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1470 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1471 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1474 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1475 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1476 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1479 set_opt(sbi
->s_mount_opt
, NO_UID32
);
1482 set_opt(sbi
->s_mount_opt
, DEBUG
);
1485 set_opt(sbi
->s_mount_opt
, OLDALLOC
);
1488 clear_opt(sbi
->s_mount_opt
, OLDALLOC
);
1490 #ifdef CONFIG_EXT4_FS_XATTR
1491 case Opt_user_xattr
:
1492 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
1494 case Opt_nouser_xattr
:
1495 clear_opt(sbi
->s_mount_opt
, XATTR_USER
);
1498 case Opt_user_xattr
:
1499 case Opt_nouser_xattr
:
1500 ext4_msg(sb
, KERN_ERR
, "(no)user_xattr options not supported");
1503 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1505 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1508 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1513 ext4_msg(sb
, KERN_ERR
, "(no)acl options not supported");
1516 case Opt_journal_update
:
1518 /* Eventually we will want to be able to create
1519 a journal file here. For now, only allow the
1520 user to specify an existing inode to be the
1523 ext4_msg(sb
, KERN_ERR
,
1524 "Cannot specify journal on remount");
1527 set_opt(sbi
->s_mount_opt
, UPDATE_JOURNAL
);
1529 case Opt_journal_dev
:
1531 ext4_msg(sb
, KERN_ERR
,
1532 "Cannot specify journal on remount");
1535 if (match_int(&args
[0], &option
))
1537 *journal_devnum
= option
;
1539 case Opt_journal_checksum
:
1540 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1542 case Opt_journal_async_commit
:
1543 set_opt(sbi
->s_mount_opt
, JOURNAL_ASYNC_COMMIT
);
1544 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1547 set_opt(sbi
->s_mount_opt
, NOLOAD
);
1550 if (match_int(&args
[0], &option
))
1555 option
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1556 sbi
->s_commit_interval
= HZ
* option
;
1558 case Opt_max_batch_time
:
1559 if (match_int(&args
[0], &option
))
1564 option
= EXT4_DEF_MAX_BATCH_TIME
;
1565 sbi
->s_max_batch_time
= option
;
1567 case Opt_min_batch_time
:
1568 if (match_int(&args
[0], &option
))
1572 sbi
->s_min_batch_time
= option
;
1574 case Opt_data_journal
:
1575 data_opt
= EXT4_MOUNT_JOURNAL_DATA
;
1577 case Opt_data_ordered
:
1578 data_opt
= EXT4_MOUNT_ORDERED_DATA
;
1580 case Opt_data_writeback
:
1581 data_opt
= EXT4_MOUNT_WRITEBACK_DATA
;
1584 if (test_opt(sb
, DATA_FLAGS
) != data_opt
) {
1585 ext4_msg(sb
, KERN_ERR
,
1586 "Cannot change data mode on remount");
1590 clear_opt(sbi
->s_mount_opt
, DATA_FLAGS
);
1591 sbi
->s_mount_opt
|= data_opt
;
1594 case Opt_data_err_abort
:
1595 set_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1597 case Opt_data_err_ignore
:
1598 clear_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1602 if (!set_qf_name(sb
, USRQUOTA
, &args
[0]))
1606 if (!set_qf_name(sb
, GRPQUOTA
, &args
[0]))
1609 case Opt_offusrjquota
:
1610 if (!clear_qf_name(sb
, USRQUOTA
))
1613 case Opt_offgrpjquota
:
1614 if (!clear_qf_name(sb
, GRPQUOTA
))
1618 case Opt_jqfmt_vfsold
:
1619 qfmt
= QFMT_VFS_OLD
;
1621 case Opt_jqfmt_vfsv0
:
1624 case Opt_jqfmt_vfsv1
:
1627 if (sb_any_quota_loaded(sb
) &&
1628 sbi
->s_jquota_fmt
!= qfmt
) {
1629 ext4_msg(sb
, KERN_ERR
, "Cannot change "
1630 "journaled quota options when "
1634 sbi
->s_jquota_fmt
= qfmt
;
1638 set_opt(sbi
->s_mount_opt
, QUOTA
);
1639 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
1642 set_opt(sbi
->s_mount_opt
, QUOTA
);
1643 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1646 if (sb_any_quota_loaded(sb
)) {
1647 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1648 "options when quota turned on");
1651 clear_opt(sbi
->s_mount_opt
, QUOTA
);
1652 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1653 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1659 ext4_msg(sb
, KERN_ERR
,
1660 "quota options not supported");
1664 case Opt_offusrjquota
:
1665 case Opt_offgrpjquota
:
1666 case Opt_jqfmt_vfsold
:
1667 case Opt_jqfmt_vfsv0
:
1668 case Opt_jqfmt_vfsv1
:
1669 ext4_msg(sb
, KERN_ERR
,
1670 "journaled quota options not supported");
1676 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1679 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1683 if (match_int(&args
[0], &option
))
1686 option
= 1; /* No argument, default to 1 */
1688 set_opt(sbi
->s_mount_opt
, BARRIER
);
1690 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1696 ext4_msg(sb
, KERN_ERR
,
1697 "resize option only available "
1701 if (match_int(&args
[0], &option
) != 0)
1703 *n_blocks_count
= option
;
1706 ext4_msg(sb
, KERN_WARNING
,
1707 "Ignoring deprecated nobh option");
1710 ext4_msg(sb
, KERN_WARNING
,
1711 "Ignoring deprecated bh option");
1714 set_opt(sbi
->s_mount_opt
, I_VERSION
);
1715 sb
->s_flags
|= MS_I_VERSION
;
1717 case Opt_nodelalloc
:
1718 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
1721 if (match_int(&args
[0], &option
))
1725 sbi
->s_stripe
= option
;
1728 set_opt(sbi
->s_mount_opt
, DELALLOC
);
1730 case Opt_block_validity
:
1731 set_opt(sbi
->s_mount_opt
, BLOCK_VALIDITY
);
1733 case Opt_noblock_validity
:
1734 clear_opt(sbi
->s_mount_opt
, BLOCK_VALIDITY
);
1736 case Opt_inode_readahead_blks
:
1737 if (match_int(&args
[0], &option
))
1739 if (option
< 0 || option
> (1 << 30))
1741 if (!is_power_of_2(option
)) {
1742 ext4_msg(sb
, KERN_ERR
,
1743 "EXT4-fs: inode_readahead_blks"
1744 " must be a power of 2");
1747 sbi
->s_inode_readahead_blks
= option
;
1749 case Opt_journal_ioprio
:
1750 if (match_int(&args
[0], &option
))
1752 if (option
< 0 || option
> 7)
1754 *journal_ioprio
= IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
,
1757 case Opt_noauto_da_alloc
:
1758 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1760 case Opt_auto_da_alloc
:
1762 if (match_int(&args
[0], &option
))
1765 option
= 1; /* No argument, default to 1 */
1767 clear_opt(sbi
->s_mount_opt
, NO_AUTO_DA_ALLOC
);
1769 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1772 set_opt(sbi
->s_mount_opt
, DISCARD
);
1775 clear_opt(sbi
->s_mount_opt
, DISCARD
);
1777 case Opt_dioread_nolock
:
1778 set_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
1780 case Opt_dioread_lock
:
1781 clear_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
1783 case Opt_init_inode_table
:
1784 set_opt(sbi
->s_mount_opt
, INIT_INODE_TABLE
);
1786 if (match_int(&args
[0], &option
))
1789 option
= EXT4_DEF_LI_WAIT_MULT
;
1792 sbi
->s_li_wait_mult
= option
;
1794 case Opt_noinit_inode_table
:
1795 clear_opt(sbi
->s_mount_opt
, INIT_INODE_TABLE
);
1798 ext4_msg(sb
, KERN_ERR
,
1799 "Unrecognized mount option \"%s\" "
1800 "or missing value", p
);
1805 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1806 if (test_opt(sb
, USRQUOTA
) && sbi
->s_qf_names
[USRQUOTA
])
1807 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1809 if (test_opt(sb
, GRPQUOTA
) && sbi
->s_qf_names
[GRPQUOTA
])
1810 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1812 if (test_opt(sb
, GRPQUOTA
) || test_opt(sb
, USRQUOTA
)) {
1813 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1818 if (!sbi
->s_jquota_fmt
) {
1819 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1824 if (sbi
->s_jquota_fmt
) {
1825 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1826 "specified with no journaling "
1835 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1838 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1841 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1842 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
1843 "forcing read-only mode");
1848 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1849 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
1850 "running e2fsck is recommended");
1851 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1852 ext4_msg(sb
, KERN_WARNING
,
1853 "warning: mounting fs with errors, "
1854 "running e2fsck is recommended");
1855 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
1856 le16_to_cpu(es
->s_mnt_count
) >=
1857 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1858 ext4_msg(sb
, KERN_WARNING
,
1859 "warning: maximal mount count reached, "
1860 "running e2fsck is recommended");
1861 else if (le32_to_cpu(es
->s_checkinterval
) &&
1862 (le32_to_cpu(es
->s_lastcheck
) +
1863 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1864 ext4_msg(sb
, KERN_WARNING
,
1865 "warning: checktime reached, "
1866 "running e2fsck is recommended");
1867 if (!sbi
->s_journal
)
1868 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1869 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1870 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1871 le16_add_cpu(&es
->s_mnt_count
, 1);
1872 es
->s_mtime
= cpu_to_le32(get_seconds());
1873 ext4_update_dynamic_rev(sb
);
1875 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1877 ext4_commit_super(sb
, 1);
1878 if (test_opt(sb
, DEBUG
))
1879 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
1880 "bpg=%lu, ipg=%lu, mo=%04x]\n",
1882 sbi
->s_groups_count
,
1883 EXT4_BLOCKS_PER_GROUP(sb
),
1884 EXT4_INODES_PER_GROUP(sb
),
1890 static int ext4_fill_flex_info(struct super_block
*sb
)
1892 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1893 struct ext4_group_desc
*gdp
= NULL
;
1894 ext4_group_t flex_group_count
;
1895 ext4_group_t flex_group
;
1896 int groups_per_flex
= 0;
1900 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1901 groups_per_flex
= 1 << sbi
->s_log_groups_per_flex
;
1903 if (groups_per_flex
< 2) {
1904 sbi
->s_log_groups_per_flex
= 0;
1908 /* We allocate both existing and potentially added groups */
1909 flex_group_count
= ((sbi
->s_groups_count
+ groups_per_flex
- 1) +
1910 ((le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
) + 1) <<
1911 EXT4_DESC_PER_BLOCK_BITS(sb
))) / groups_per_flex
;
1912 size
= flex_group_count
* sizeof(struct flex_groups
);
1913 sbi
->s_flex_groups
= kzalloc(size
, GFP_KERNEL
);
1914 if (sbi
->s_flex_groups
== NULL
) {
1915 sbi
->s_flex_groups
= vmalloc(size
);
1916 if (sbi
->s_flex_groups
)
1917 memset(sbi
->s_flex_groups
, 0, size
);
1919 if (sbi
->s_flex_groups
== NULL
) {
1920 ext4_msg(sb
, KERN_ERR
, "not enough memory for "
1921 "%u flex groups", flex_group_count
);
1925 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1926 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1928 flex_group
= ext4_flex_group(sbi
, i
);
1929 atomic_add(ext4_free_inodes_count(sb
, gdp
),
1930 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
1931 atomic_add(ext4_free_blks_count(sb
, gdp
),
1932 &sbi
->s_flex_groups
[flex_group
].free_blocks
);
1933 atomic_add(ext4_used_dirs_count(sb
, gdp
),
1934 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
1942 __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
1943 struct ext4_group_desc
*gdp
)
1947 if (sbi
->s_es
->s_feature_ro_compat
&
1948 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) {
1949 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
1950 __le32 le_group
= cpu_to_le32(block_group
);
1952 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
1953 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
1954 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
1955 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
1956 /* for checksum of struct ext4_group_desc do the rest...*/
1957 if ((sbi
->s_es
->s_feature_incompat
&
1958 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
1959 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
1960 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
1961 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
1965 return cpu_to_le16(crc
);
1968 int ext4_group_desc_csum_verify(struct ext4_sb_info
*sbi
, __u32 block_group
,
1969 struct ext4_group_desc
*gdp
)
1971 if ((sbi
->s_es
->s_feature_ro_compat
&
1972 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) &&
1973 (gdp
->bg_checksum
!= ext4_group_desc_csum(sbi
, block_group
, gdp
)))
1979 /* Called at mount-time, super-block is locked */
1980 static int ext4_check_descriptors(struct super_block
*sb
,
1981 ext4_group_t
*first_not_zeroed
)
1983 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1984 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
1985 ext4_fsblk_t last_block
;
1986 ext4_fsblk_t block_bitmap
;
1987 ext4_fsblk_t inode_bitmap
;
1988 ext4_fsblk_t inode_table
;
1989 int flexbg_flag
= 0;
1990 ext4_group_t i
, grp
= sbi
->s_groups_count
;
1992 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
1995 ext4_debug("Checking group descriptors");
1997 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1998 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2000 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
2001 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
2003 last_block
= first_block
+
2004 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2006 if ((grp
== sbi
->s_groups_count
) &&
2007 !(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2010 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
2011 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
2012 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2013 "Block bitmap for group %u not in group "
2014 "(block %llu)!", i
, block_bitmap
);
2017 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
2018 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
2019 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2020 "Inode bitmap for group %u not in group "
2021 "(block %llu)!", i
, inode_bitmap
);
2024 inode_table
= ext4_inode_table(sb
, gdp
);
2025 if (inode_table
< first_block
||
2026 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
2027 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2028 "Inode table for group %u not in group "
2029 "(block %llu)!", i
, inode_table
);
2032 ext4_lock_group(sb
, i
);
2033 if (!ext4_group_desc_csum_verify(sbi
, i
, gdp
)) {
2034 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2035 "Checksum for group %u failed (%u!=%u)",
2036 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
2037 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
2038 if (!(sb
->s_flags
& MS_RDONLY
)) {
2039 ext4_unlock_group(sb
, i
);
2043 ext4_unlock_group(sb
, i
);
2045 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
2047 if (NULL
!= first_not_zeroed
)
2048 *first_not_zeroed
= grp
;
2050 ext4_free_blocks_count_set(sbi
->s_es
, ext4_count_free_blocks(sb
));
2051 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
2055 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2056 * the superblock) which were deleted from all directories, but held open by
2057 * a process at the time of a crash. We walk the list and try to delete these
2058 * inodes at recovery time (only with a read-write filesystem).
2060 * In order to keep the orphan inode chain consistent during traversal (in
2061 * case of crash during recovery), we link each inode into the superblock
2062 * orphan list_head and handle it the same way as an inode deletion during
2063 * normal operation (which journals the operations for us).
2065 * We only do an iget() and an iput() on each inode, which is very safe if we
2066 * accidentally point at an in-use or already deleted inode. The worst that
2067 * can happen in this case is that we get a "bit already cleared" message from
2068 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2069 * e2fsck was run on this filesystem, and it must have already done the orphan
2070 * inode cleanup for us, so we can safely abort without any further action.
2072 static void ext4_orphan_cleanup(struct super_block
*sb
,
2073 struct ext4_super_block
*es
)
2075 unsigned int s_flags
= sb
->s_flags
;
2076 int nr_orphans
= 0, nr_truncates
= 0;
2080 if (!es
->s_last_orphan
) {
2081 jbd_debug(4, "no orphan inodes to clean up\n");
2085 if (bdev_read_only(sb
->s_bdev
)) {
2086 ext4_msg(sb
, KERN_ERR
, "write access "
2087 "unavailable, skipping orphan cleanup");
2091 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2092 if (es
->s_last_orphan
)
2093 jbd_debug(1, "Errors on filesystem, "
2094 "clearing orphan list.\n");
2095 es
->s_last_orphan
= 0;
2096 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2100 if (s_flags
& MS_RDONLY
) {
2101 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
2102 sb
->s_flags
&= ~MS_RDONLY
;
2105 /* Needed for iput() to work correctly and not trash data */
2106 sb
->s_flags
|= MS_ACTIVE
;
2107 /* Turn on quotas so that they are updated correctly */
2108 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2109 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
2110 int ret
= ext4_quota_on_mount(sb
, i
);
2112 ext4_msg(sb
, KERN_ERR
,
2113 "Cannot turn on journaled "
2114 "quota: error %d", ret
);
2119 while (es
->s_last_orphan
) {
2120 struct inode
*inode
;
2122 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
2123 if (IS_ERR(inode
)) {
2124 es
->s_last_orphan
= 0;
2128 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
2129 dquot_initialize(inode
);
2130 if (inode
->i_nlink
) {
2131 ext4_msg(sb
, KERN_DEBUG
,
2132 "%s: truncating inode %lu to %lld bytes",
2133 __func__
, inode
->i_ino
, inode
->i_size
);
2134 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2135 inode
->i_ino
, inode
->i_size
);
2136 ext4_truncate(inode
);
2139 ext4_msg(sb
, KERN_DEBUG
,
2140 "%s: deleting unreferenced inode %lu",
2141 __func__
, inode
->i_ino
);
2142 jbd_debug(2, "deleting unreferenced inode %lu\n",
2146 iput(inode
); /* The delete magic happens here! */
2149 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2152 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
2153 PLURAL(nr_orphans
));
2155 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
2156 PLURAL(nr_truncates
));
2158 /* Turn quotas off */
2159 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2160 if (sb_dqopt(sb
)->files
[i
])
2161 dquot_quota_off(sb
, i
);
2164 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
2168 * Maximal extent format file size.
2169 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2170 * extent format containers, within a sector_t, and within i_blocks
2171 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2172 * so that won't be a limiting factor.
2174 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2176 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
2179 loff_t upper_limit
= MAX_LFS_FILESIZE
;
2181 /* small i_blocks in vfs inode? */
2182 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2184 * CONFIG_LBDAF is not enabled implies the inode
2185 * i_block represent total blocks in 512 bytes
2186 * 32 == size of vfs inode i_blocks * 8
2188 upper_limit
= (1LL << 32) - 1;
2190 /* total blocks in file system block size */
2191 upper_limit
>>= (blkbits
- 9);
2192 upper_limit
<<= blkbits
;
2195 /* 32-bit extent-start container, ee_block */
2200 /* Sanity check against vm- & vfs- imposed limits */
2201 if (res
> upper_limit
)
2208 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2209 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2210 * We need to be 1 filesystem block less than the 2^48 sector limit.
2212 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2214 loff_t res
= EXT4_NDIR_BLOCKS
;
2217 /* This is calculated to be the largest file size for a dense, block
2218 * mapped file such that the file's total number of 512-byte sectors,
2219 * including data and all indirect blocks, does not exceed (2^48 - 1).
2221 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2222 * number of 512-byte sectors of the file.
2225 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2227 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2228 * the inode i_block field represents total file blocks in
2229 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2231 upper_limit
= (1LL << 32) - 1;
2233 /* total blocks in file system block size */
2234 upper_limit
>>= (bits
- 9);
2238 * We use 48 bit ext4_inode i_blocks
2239 * With EXT4_HUGE_FILE_FL set the i_blocks
2240 * represent total number of blocks in
2241 * file system block size
2243 upper_limit
= (1LL << 48) - 1;
2247 /* indirect blocks */
2249 /* double indirect blocks */
2250 meta_blocks
+= 1 + (1LL << (bits
-2));
2251 /* tripple indirect blocks */
2252 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2254 upper_limit
-= meta_blocks
;
2255 upper_limit
<<= bits
;
2257 res
+= 1LL << (bits
-2);
2258 res
+= 1LL << (2*(bits
-2));
2259 res
+= 1LL << (3*(bits
-2));
2261 if (res
> upper_limit
)
2264 if (res
> MAX_LFS_FILESIZE
)
2265 res
= MAX_LFS_FILESIZE
;
2270 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2271 ext4_fsblk_t logical_sb_block
, int nr
)
2273 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2274 ext4_group_t bg
, first_meta_bg
;
2277 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2279 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
2281 return logical_sb_block
+ nr
+ 1;
2282 bg
= sbi
->s_desc_per_block
* nr
;
2283 if (ext4_bg_has_super(sb
, bg
))
2286 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2290 * ext4_get_stripe_size: Get the stripe size.
2291 * @sbi: In memory super block info
2293 * If we have specified it via mount option, then
2294 * use the mount option value. If the value specified at mount time is
2295 * greater than the blocks per group use the super block value.
2296 * If the super block value is greater than blocks per group return 0.
2297 * Allocator needs it be less than blocks per group.
2300 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2302 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2303 unsigned long stripe_width
=
2304 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2306 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2307 return sbi
->s_stripe
;
2309 if (stripe_width
<= sbi
->s_blocks_per_group
)
2310 return stripe_width
;
2312 if (stride
<= sbi
->s_blocks_per_group
)
2321 struct attribute attr
;
2322 ssize_t (*show
)(struct ext4_attr
*, struct ext4_sb_info
*, char *);
2323 ssize_t (*store
)(struct ext4_attr
*, struct ext4_sb_info
*,
2324 const char *, size_t);
2328 static int parse_strtoul(const char *buf
,
2329 unsigned long max
, unsigned long *value
)
2333 *value
= simple_strtoul(skip_spaces(buf
), &endp
, 0);
2334 endp
= skip_spaces(endp
);
2335 if (*endp
|| *value
> max
)
2341 static ssize_t
delayed_allocation_blocks_show(struct ext4_attr
*a
,
2342 struct ext4_sb_info
*sbi
,
2345 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2346 (s64
) percpu_counter_sum(&sbi
->s_dirtyblocks_counter
));
2349 static ssize_t
session_write_kbytes_show(struct ext4_attr
*a
,
2350 struct ext4_sb_info
*sbi
, char *buf
)
2352 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2354 if (!sb
->s_bdev
->bd_part
)
2355 return snprintf(buf
, PAGE_SIZE
, "0\n");
2356 return snprintf(buf
, PAGE_SIZE
, "%lu\n",
2357 (part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2358 sbi
->s_sectors_written_start
) >> 1);
2361 static ssize_t
lifetime_write_kbytes_show(struct ext4_attr
*a
,
2362 struct ext4_sb_info
*sbi
, char *buf
)
2364 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2366 if (!sb
->s_bdev
->bd_part
)
2367 return snprintf(buf
, PAGE_SIZE
, "0\n");
2368 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2369 (unsigned long long)(sbi
->s_kbytes_written
+
2370 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2371 EXT4_SB(sb
)->s_sectors_written_start
) >> 1)));
2374 static ssize_t
inode_readahead_blks_store(struct ext4_attr
*a
,
2375 struct ext4_sb_info
*sbi
,
2376 const char *buf
, size_t count
)
2380 if (parse_strtoul(buf
, 0x40000000, &t
))
2383 if (!is_power_of_2(t
))
2386 sbi
->s_inode_readahead_blks
= t
;
2390 static ssize_t
sbi_ui_show(struct ext4_attr
*a
,
2391 struct ext4_sb_info
*sbi
, char *buf
)
2393 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2395 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
2398 static ssize_t
sbi_ui_store(struct ext4_attr
*a
,
2399 struct ext4_sb_info
*sbi
,
2400 const char *buf
, size_t count
)
2402 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2405 if (parse_strtoul(buf
, 0xffffffff, &t
))
2411 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2412 static struct ext4_attr ext4_attr_##_name = { \
2413 .attr = {.name = __stringify(_name), .mode = _mode }, \
2416 .offset = offsetof(struct ext4_sb_info, _elname), \
2418 #define EXT4_ATTR(name, mode, show, store) \
2419 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2421 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2422 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2423 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2424 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2425 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2426 #define ATTR_LIST(name) &ext4_attr_##name.attr
2428 EXT4_RO_ATTR(delayed_allocation_blocks
);
2429 EXT4_RO_ATTR(session_write_kbytes
);
2430 EXT4_RO_ATTR(lifetime_write_kbytes
);
2431 EXT4_ATTR_OFFSET(inode_readahead_blks
, 0644, sbi_ui_show
,
2432 inode_readahead_blks_store
, s_inode_readahead_blks
);
2433 EXT4_RW_ATTR_SBI_UI(inode_goal
, s_inode_goal
);
2434 EXT4_RW_ATTR_SBI_UI(mb_stats
, s_mb_stats
);
2435 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan
, s_mb_max_to_scan
);
2436 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan
, s_mb_min_to_scan
);
2437 EXT4_RW_ATTR_SBI_UI(mb_order2_req
, s_mb_order2_reqs
);
2438 EXT4_RW_ATTR_SBI_UI(mb_stream_req
, s_mb_stream_request
);
2439 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc
, s_mb_group_prealloc
);
2440 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump
, s_max_writeback_mb_bump
);
2442 static struct attribute
*ext4_attrs
[] = {
2443 ATTR_LIST(delayed_allocation_blocks
),
2444 ATTR_LIST(session_write_kbytes
),
2445 ATTR_LIST(lifetime_write_kbytes
),
2446 ATTR_LIST(inode_readahead_blks
),
2447 ATTR_LIST(inode_goal
),
2448 ATTR_LIST(mb_stats
),
2449 ATTR_LIST(mb_max_to_scan
),
2450 ATTR_LIST(mb_min_to_scan
),
2451 ATTR_LIST(mb_order2_req
),
2452 ATTR_LIST(mb_stream_req
),
2453 ATTR_LIST(mb_group_prealloc
),
2454 ATTR_LIST(max_writeback_mb_bump
),
2458 /* Features this copy of ext4 supports */
2459 EXT4_INFO_ATTR(lazy_itable_init
);
2460 EXT4_INFO_ATTR(batched_discard
);
2462 static struct attribute
*ext4_feat_attrs
[] = {
2463 ATTR_LIST(lazy_itable_init
),
2464 ATTR_LIST(batched_discard
),
2468 static ssize_t
ext4_attr_show(struct kobject
*kobj
,
2469 struct attribute
*attr
, char *buf
)
2471 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2473 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2475 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
2478 static ssize_t
ext4_attr_store(struct kobject
*kobj
,
2479 struct attribute
*attr
,
2480 const char *buf
, size_t len
)
2482 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2484 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2486 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
2489 static void ext4_sb_release(struct kobject
*kobj
)
2491 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2493 complete(&sbi
->s_kobj_unregister
);
2496 static const struct sysfs_ops ext4_attr_ops
= {
2497 .show
= ext4_attr_show
,
2498 .store
= ext4_attr_store
,
2501 static struct kobj_type ext4_ktype
= {
2502 .default_attrs
= ext4_attrs
,
2503 .sysfs_ops
= &ext4_attr_ops
,
2504 .release
= ext4_sb_release
,
2507 static void ext4_feat_release(struct kobject
*kobj
)
2509 complete(&ext4_feat
->f_kobj_unregister
);
2512 static struct kobj_type ext4_feat_ktype
= {
2513 .default_attrs
= ext4_feat_attrs
,
2514 .sysfs_ops
= &ext4_attr_ops
,
2515 .release
= ext4_feat_release
,
2519 * Check whether this filesystem can be mounted based on
2520 * the features present and the RDONLY/RDWR mount requested.
2521 * Returns 1 if this filesystem can be mounted as requested,
2522 * 0 if it cannot be.
2524 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2526 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
)) {
2527 ext4_msg(sb
, KERN_ERR
,
2528 "Couldn't mount because of "
2529 "unsupported optional features (%x)",
2530 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2531 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2538 /* Check that feature set is OK for a read-write mount */
2539 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
)) {
2540 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2541 "unsupported optional features (%x)",
2542 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2543 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2547 * Large file size enabled file system can only be mounted
2548 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2550 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
2551 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2552 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2553 "cannot be mounted RDWR without "
2562 * This function is called once a day if we have errors logged
2563 * on the file system
2565 static void print_daily_error_info(unsigned long arg
)
2567 struct super_block
*sb
= (struct super_block
*) arg
;
2568 struct ext4_sb_info
*sbi
;
2569 struct ext4_super_block
*es
;
2574 if (es
->s_error_count
)
2575 ext4_msg(sb
, KERN_NOTICE
, "error count: %u",
2576 le32_to_cpu(es
->s_error_count
));
2577 if (es
->s_first_error_time
) {
2578 printk(KERN_NOTICE
"EXT4-fs (%s): initial error at %u: %.*s:%d",
2579 sb
->s_id
, le32_to_cpu(es
->s_first_error_time
),
2580 (int) sizeof(es
->s_first_error_func
),
2581 es
->s_first_error_func
,
2582 le32_to_cpu(es
->s_first_error_line
));
2583 if (es
->s_first_error_ino
)
2584 printk(": inode %u",
2585 le32_to_cpu(es
->s_first_error_ino
));
2586 if (es
->s_first_error_block
)
2587 printk(": block %llu", (unsigned long long)
2588 le64_to_cpu(es
->s_first_error_block
));
2591 if (es
->s_last_error_time
) {
2592 printk(KERN_NOTICE
"EXT4-fs (%s): last error at %u: %.*s:%d",
2593 sb
->s_id
, le32_to_cpu(es
->s_last_error_time
),
2594 (int) sizeof(es
->s_last_error_func
),
2595 es
->s_last_error_func
,
2596 le32_to_cpu(es
->s_last_error_line
));
2597 if (es
->s_last_error_ino
)
2598 printk(": inode %u",
2599 le32_to_cpu(es
->s_last_error_ino
));
2600 if (es
->s_last_error_block
)
2601 printk(": block %llu", (unsigned long long)
2602 le64_to_cpu(es
->s_last_error_block
));
2605 mod_timer(&sbi
->s_err_report
, jiffies
+ 24*60*60*HZ
); /* Once a day */
2608 static void ext4_lazyinode_timeout(unsigned long data
)
2610 struct task_struct
*p
= (struct task_struct
*)data
;
2614 /* Find next suitable group and run ext4_init_inode_table */
2615 static int ext4_run_li_request(struct ext4_li_request
*elr
)
2617 struct ext4_group_desc
*gdp
= NULL
;
2618 ext4_group_t group
, ngroups
;
2619 struct super_block
*sb
;
2620 unsigned long timeout
= 0;
2624 ngroups
= EXT4_SB(sb
)->s_groups_count
;
2626 for (group
= elr
->lr_next_group
; group
< ngroups
; group
++) {
2627 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2633 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2637 if (group
== ngroups
)
2642 ret
= ext4_init_inode_table(sb
, group
,
2643 elr
->lr_timeout
? 0 : 1);
2644 if (elr
->lr_timeout
== 0) {
2645 timeout
= jiffies
- timeout
;
2646 if (elr
->lr_sbi
->s_li_wait_mult
)
2647 timeout
*= elr
->lr_sbi
->s_li_wait_mult
;
2650 elr
->lr_timeout
= timeout
;
2652 elr
->lr_next_sched
= jiffies
+ elr
->lr_timeout
;
2653 elr
->lr_next_group
= group
+ 1;
2660 * Remove lr_request from the list_request and free the
2661 * request tructure. Should be called with li_list_mtx held
2663 static void ext4_remove_li_request(struct ext4_li_request
*elr
)
2665 struct ext4_sb_info
*sbi
;
2672 list_del(&elr
->lr_request
);
2673 sbi
->s_li_request
= NULL
;
2677 static void ext4_unregister_li_request(struct super_block
*sb
)
2679 struct ext4_li_request
*elr
= EXT4_SB(sb
)->s_li_request
;
2684 mutex_lock(&ext4_li_info
->li_list_mtx
);
2685 ext4_remove_li_request(elr
);
2686 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2690 * This is the function where ext4lazyinit thread lives. It walks
2691 * through the request list searching for next scheduled filesystem.
2692 * When such a fs is found, run the lazy initialization request
2693 * (ext4_rn_li_request) and keep track of the time spend in this
2694 * function. Based on that time we compute next schedule time of
2695 * the request. When walking through the list is complete, compute
2696 * next waking time and put itself into sleep.
2698 static int ext4_lazyinit_thread(void *arg
)
2700 struct ext4_lazy_init
*eli
= (struct ext4_lazy_init
*)arg
;
2701 struct list_head
*pos
, *n
;
2702 struct ext4_li_request
*elr
;
2703 unsigned long next_wakeup
;
2707 BUG_ON(NULL
== eli
);
2709 eli
->li_timer
.data
= (unsigned long)current
;
2710 eli
->li_timer
.function
= ext4_lazyinode_timeout
;
2712 eli
->li_task
= current
;
2713 wake_up(&eli
->li_wait_task
);
2717 next_wakeup
= MAX_JIFFY_OFFSET
;
2719 mutex_lock(&eli
->li_list_mtx
);
2720 if (list_empty(&eli
->li_request_list
)) {
2721 mutex_unlock(&eli
->li_list_mtx
);
2725 list_for_each_safe(pos
, n
, &eli
->li_request_list
) {
2726 elr
= list_entry(pos
, struct ext4_li_request
,
2729 if (time_after_eq(jiffies
, elr
->lr_next_sched
))
2730 ret
= ext4_run_li_request(elr
);
2734 ext4_remove_li_request(elr
);
2738 if (time_before(elr
->lr_next_sched
, next_wakeup
))
2739 next_wakeup
= elr
->lr_next_sched
;
2741 mutex_unlock(&eli
->li_list_mtx
);
2743 if (freezing(current
))
2746 if (time_after_eq(jiffies
, next_wakeup
)) {
2751 eli
->li_timer
.expires
= next_wakeup
;
2752 add_timer(&eli
->li_timer
);
2753 prepare_to_wait(&eli
->li_wait_daemon
, &wait
,
2754 TASK_INTERRUPTIBLE
);
2755 if (time_before(jiffies
, next_wakeup
))
2757 finish_wait(&eli
->li_wait_daemon
, &wait
);
2762 * It looks like the request list is empty, but we need
2763 * to check it under the li_list_mtx lock, to prevent any
2764 * additions into it, and of course we should lock ext4_li_mtx
2765 * to atomically free the list and ext4_li_info, because at
2766 * this point another ext4 filesystem could be registering
2769 mutex_lock(&ext4_li_mtx
);
2770 mutex_lock(&eli
->li_list_mtx
);
2771 if (!list_empty(&eli
->li_request_list
)) {
2772 mutex_unlock(&eli
->li_list_mtx
);
2773 mutex_unlock(&ext4_li_mtx
);
2776 mutex_unlock(&eli
->li_list_mtx
);
2777 del_timer_sync(&ext4_li_info
->li_timer
);
2778 eli
->li_task
= NULL
;
2779 wake_up(&eli
->li_wait_task
);
2781 kfree(ext4_li_info
);
2782 ext4_li_info
= NULL
;
2783 mutex_unlock(&ext4_li_mtx
);
2788 static void ext4_clear_request_list(void)
2790 struct list_head
*pos
, *n
;
2791 struct ext4_li_request
*elr
;
2793 mutex_lock(&ext4_li_info
->li_list_mtx
);
2794 if (list_empty(&ext4_li_info
->li_request_list
))
2797 list_for_each_safe(pos
, n
, &ext4_li_info
->li_request_list
) {
2798 elr
= list_entry(pos
, struct ext4_li_request
,
2800 ext4_remove_li_request(elr
);
2802 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2805 static int ext4_run_lazyinit_thread(void)
2807 struct task_struct
*t
;
2809 t
= kthread_run(ext4_lazyinit_thread
, ext4_li_info
, "ext4lazyinit");
2811 int err
= PTR_ERR(t
);
2812 ext4_clear_request_list();
2813 del_timer_sync(&ext4_li_info
->li_timer
);
2814 kfree(ext4_li_info
);
2815 ext4_li_info
= NULL
;
2816 printk(KERN_CRIT
"EXT4: error %d creating inode table "
2817 "initialization thread\n",
2821 ext4_li_info
->li_state
|= EXT4_LAZYINIT_RUNNING
;
2823 wait_event(ext4_li_info
->li_wait_task
, ext4_li_info
->li_task
!= NULL
);
2828 * Check whether it make sense to run itable init. thread or not.
2829 * If there is at least one uninitialized inode table, return
2830 * corresponding group number, else the loop goes through all
2831 * groups and return total number of groups.
2833 static ext4_group_t
ext4_has_uninit_itable(struct super_block
*sb
)
2835 ext4_group_t group
, ngroups
= EXT4_SB(sb
)->s_groups_count
;
2836 struct ext4_group_desc
*gdp
= NULL
;
2838 for (group
= 0; group
< ngroups
; group
++) {
2839 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2843 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2850 static int ext4_li_info_new(void)
2852 struct ext4_lazy_init
*eli
= NULL
;
2854 eli
= kzalloc(sizeof(*eli
), GFP_KERNEL
);
2858 eli
->li_task
= NULL
;
2859 INIT_LIST_HEAD(&eli
->li_request_list
);
2860 mutex_init(&eli
->li_list_mtx
);
2862 init_waitqueue_head(&eli
->li_wait_daemon
);
2863 init_waitqueue_head(&eli
->li_wait_task
);
2864 init_timer(&eli
->li_timer
);
2865 eli
->li_state
|= EXT4_LAZYINIT_QUIT
;
2872 static struct ext4_li_request
*ext4_li_request_new(struct super_block
*sb
,
2875 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2876 struct ext4_li_request
*elr
;
2879 elr
= kzalloc(sizeof(*elr
), GFP_KERNEL
);
2885 elr
->lr_next_group
= start
;
2888 * Randomize first schedule time of the request to
2889 * spread the inode table initialization requests
2892 get_random_bytes(&rnd
, sizeof(rnd
));
2893 elr
->lr_next_sched
= jiffies
+ (unsigned long)rnd
%
2894 (EXT4_DEF_LI_MAX_START_DELAY
* HZ
);
2899 static int ext4_register_li_request(struct super_block
*sb
,
2900 ext4_group_t first_not_zeroed
)
2902 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2903 struct ext4_li_request
*elr
;
2904 ext4_group_t ngroups
= EXT4_SB(sb
)->s_groups_count
;
2907 if (sbi
->s_li_request
!= NULL
)
2910 if (first_not_zeroed
== ngroups
||
2911 (sb
->s_flags
& MS_RDONLY
) ||
2912 !test_opt(sb
, INIT_INODE_TABLE
)) {
2913 sbi
->s_li_request
= NULL
;
2917 if (first_not_zeroed
== ngroups
) {
2918 sbi
->s_li_request
= NULL
;
2922 elr
= ext4_li_request_new(sb
, first_not_zeroed
);
2928 mutex_lock(&ext4_li_mtx
);
2930 if (NULL
== ext4_li_info
) {
2931 ret
= ext4_li_info_new();
2936 mutex_lock(&ext4_li_info
->li_list_mtx
);
2937 list_add(&elr
->lr_request
, &ext4_li_info
->li_request_list
);
2938 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2940 sbi
->s_li_request
= elr
;
2942 if (!(ext4_li_info
->li_state
& EXT4_LAZYINIT_RUNNING
)) {
2943 ret
= ext4_run_lazyinit_thread();
2948 mutex_unlock(&ext4_li_mtx
);
2952 mutex_unlock(&ext4_li_mtx
);
2959 * We do not need to lock anything since this is called on
2962 static void ext4_destroy_lazyinit_thread(void)
2965 * If thread exited earlier
2966 * there's nothing to be done.
2971 ext4_clear_request_list();
2973 while (ext4_li_info
->li_task
) {
2974 wake_up(&ext4_li_info
->li_wait_daemon
);
2975 wait_event(ext4_li_info
->li_wait_task
,
2976 ext4_li_info
->li_task
== NULL
);
2980 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
2981 __releases(kernel_lock
)
2982 __acquires(kernel_lock
)
2984 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
2985 struct buffer_head
*bh
;
2986 struct ext4_super_block
*es
= NULL
;
2987 struct ext4_sb_info
*sbi
;
2989 ext4_fsblk_t sb_block
= get_sb_block(&data
);
2990 ext4_fsblk_t logical_sb_block
;
2991 unsigned long offset
= 0;
2992 unsigned long journal_devnum
= 0;
2993 unsigned long def_mount_opts
;
2999 unsigned int db_count
;
3001 int needs_recovery
, has_huge_files
;
3004 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3005 ext4_group_t first_not_zeroed
;
3007 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
3011 sbi
->s_blockgroup_lock
=
3012 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
3013 if (!sbi
->s_blockgroup_lock
) {
3017 sb
->s_fs_info
= sbi
;
3018 sbi
->s_mount_opt
= 0;
3019 sbi
->s_resuid
= EXT4_DEF_RESUID
;
3020 sbi
->s_resgid
= EXT4_DEF_RESGID
;
3021 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
3022 sbi
->s_sb_block
= sb_block
;
3023 if (sb
->s_bdev
->bd_part
)
3024 sbi
->s_sectors_written_start
=
3025 part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]);
3029 /* Cleanup superblock name */
3030 for (cp
= sb
->s_id
; (cp
= strchr(cp
, '/'));)
3034 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
3036 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
3041 * The ext4 superblock will not be buffer aligned for other than 1kB
3042 * block sizes. We need to calculate the offset from buffer start.
3044 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
3045 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3046 offset
= do_div(logical_sb_block
, blocksize
);
3048 logical_sb_block
= sb_block
;
3051 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
3052 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
3056 * Note: s_es must be initialized as soon as possible because
3057 * some ext4 macro-instructions depend on its value
3059 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
3061 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
3062 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
3064 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
3066 /* Set defaults before we parse the mount options */
3067 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
3068 set_opt(sbi
->s_mount_opt
, INIT_INODE_TABLE
);
3069 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
3070 set_opt(sbi
->s_mount_opt
, DEBUG
);
3071 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
) {
3072 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, "bsdgroups",
3074 set_opt(sbi
->s_mount_opt
, GRPID
);
3076 if (def_mount_opts
& EXT4_DEFM_UID16
)
3077 set_opt(sbi
->s_mount_opt
, NO_UID32
);
3078 #ifdef CONFIG_EXT4_FS_XATTR
3079 if (def_mount_opts
& EXT4_DEFM_XATTR_USER
)
3080 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
3082 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3083 if (def_mount_opts
& EXT4_DEFM_ACL
)
3084 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
3086 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
3087 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
3088 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
3089 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
3090 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
3091 set_opt(sbi
->s_mount_opt
, WRITEBACK_DATA
);
3093 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
3094 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
3095 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
3096 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
3098 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
3099 if (def_mount_opts
& EXT4_DEFM_BLOCK_VALIDITY
)
3100 set_opt(sbi
->s_mount_opt
, BLOCK_VALIDITY
);
3101 if (def_mount_opts
& EXT4_DEFM_DISCARD
)
3102 set_opt(sbi
->s_mount_opt
, DISCARD
);
3104 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
3105 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
3106 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
3107 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
3108 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
3110 if ((def_mount_opts
& EXT4_DEFM_NOBARRIER
) == 0)
3111 set_opt(sbi
->s_mount_opt
, BARRIER
);
3114 * enable delayed allocation by default
3115 * Use -o nodelalloc to turn it off
3117 if (!IS_EXT3_SB(sb
) &&
3118 ((def_mount_opts
& EXT4_DEFM_NODELALLOC
) == 0))
3119 set_opt(sbi
->s_mount_opt
, DELALLOC
);
3121 if (!parse_options((char *) sbi
->s_es
->s_mount_opts
, sb
,
3122 &journal_devnum
, &journal_ioprio
, NULL
, 0)) {
3123 ext4_msg(sb
, KERN_WARNING
,
3124 "failed to parse options in superblock: %s",
3125 sbi
->s_es
->s_mount_opts
);
3127 if (!parse_options((char *) data
, sb
, &journal_devnum
,
3128 &journal_ioprio
, NULL
, 0))
3131 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3132 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
3134 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
3135 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
3136 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
3137 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
3138 ext4_msg(sb
, KERN_WARNING
,
3139 "feature flags set on rev 0 fs, "
3140 "running e2fsck is recommended");
3143 * Check feature flags regardless of the revision level, since we
3144 * previously didn't change the revision level when setting the flags,
3145 * so there is a chance incompat flags are set on a rev 0 filesystem.
3147 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
3150 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
3152 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
3153 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
3154 ext4_msg(sb
, KERN_ERR
,
3155 "Unsupported filesystem blocksize %d", blocksize
);
3159 if (sb
->s_blocksize
!= blocksize
) {
3160 /* Validate the filesystem blocksize */
3161 if (!sb_set_blocksize(sb
, blocksize
)) {
3162 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
3168 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3169 offset
= do_div(logical_sb_block
, blocksize
);
3170 bh
= sb_bread(sb
, logical_sb_block
);
3172 ext4_msg(sb
, KERN_ERR
,
3173 "Can't read superblock on 2nd try");
3176 es
= (struct ext4_super_block
*)(((char *)bh
->b_data
) + offset
);
3178 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
3179 ext4_msg(sb
, KERN_ERR
,
3180 "Magic mismatch, very weird!");
3185 has_huge_files
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3186 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
);
3187 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
3189 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
3191 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
3192 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
3193 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
3195 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
3196 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
3197 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
3198 (!is_power_of_2(sbi
->s_inode_size
)) ||
3199 (sbi
->s_inode_size
> blocksize
)) {
3200 ext4_msg(sb
, KERN_ERR
,
3201 "unsupported inode size: %d",
3205 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
3206 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
3209 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
3210 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
3211 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
3212 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
3213 !is_power_of_2(sbi
->s_desc_size
)) {
3214 ext4_msg(sb
, KERN_ERR
,
3215 "unsupported descriptor size %lu",
3220 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
3222 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
3223 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
3224 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
3227 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
3228 if (sbi
->s_inodes_per_block
== 0)
3230 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
3231 sbi
->s_inodes_per_block
;
3232 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
3234 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3235 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
3236 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
3238 for (i
= 0; i
< 4; i
++)
3239 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
3240 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
3241 i
= le32_to_cpu(es
->s_flags
);
3242 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
3243 sbi
->s_hash_unsigned
= 3;
3244 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
3245 #ifdef __CHAR_UNSIGNED__
3246 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
3247 sbi
->s_hash_unsigned
= 3;
3249 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
3254 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
3255 ext4_msg(sb
, KERN_ERR
,
3256 "#blocks per group too big: %lu",
3257 sbi
->s_blocks_per_group
);
3260 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
3261 ext4_msg(sb
, KERN_ERR
,
3262 "#inodes per group too big: %lu",
3263 sbi
->s_inodes_per_group
);
3268 * Test whether we have more sectors than will fit in sector_t,
3269 * and whether the max offset is addressable by the page cache.
3271 if ((ext4_blocks_count(es
) >
3272 (sector_t
)(~0ULL) >> (sb
->s_blocksize_bits
- 9)) ||
3273 (ext4_blocks_count(es
) >
3274 (pgoff_t
)(~0ULL) >> (PAGE_CACHE_SHIFT
- sb
->s_blocksize_bits
))) {
3275 ext4_msg(sb
, KERN_ERR
, "filesystem"
3276 " too large to mount safely on this system");
3277 if (sizeof(sector_t
) < 8)
3278 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
3283 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
3286 /* check blocks count against device size */
3287 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
3288 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
3289 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
3290 "exceeds size of device (%llu blocks)",
3291 ext4_blocks_count(es
), blocks_count
);
3296 * It makes no sense for the first data block to be beyond the end
3297 * of the filesystem.
3299 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
3300 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data"
3301 "block %u is beyond end of filesystem (%llu)",
3302 le32_to_cpu(es
->s_first_data_block
),
3303 ext4_blocks_count(es
));
3306 blocks_count
= (ext4_blocks_count(es
) -
3307 le32_to_cpu(es
->s_first_data_block
) +
3308 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
3309 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
3310 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
3311 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
3312 "(block count %llu, first data block %u, "
3313 "blocks per group %lu)", sbi
->s_groups_count
,
3314 ext4_blocks_count(es
),
3315 le32_to_cpu(es
->s_first_data_block
),
3316 EXT4_BLOCKS_PER_GROUP(sb
));
3319 sbi
->s_groups_count
= blocks_count
;
3320 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
3321 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
3322 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
3323 EXT4_DESC_PER_BLOCK(sb
);
3324 sbi
->s_group_desc
= kmalloc(db_count
* sizeof(struct buffer_head
*),
3326 if (sbi
->s_group_desc
== NULL
) {
3327 ext4_msg(sb
, KERN_ERR
, "not enough memory");
3331 #ifdef CONFIG_PROC_FS
3333 sbi
->s_proc
= proc_mkdir(sb
->s_id
, ext4_proc_root
);
3336 bgl_lock_init(sbi
->s_blockgroup_lock
);
3338 for (i
= 0; i
< db_count
; i
++) {
3339 block
= descriptor_loc(sb
, logical_sb_block
, i
);
3340 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
3341 if (!sbi
->s_group_desc
[i
]) {
3342 ext4_msg(sb
, KERN_ERR
,
3343 "can't read group descriptor %d", i
);
3348 if (!ext4_check_descriptors(sb
, &first_not_zeroed
)) {
3349 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
3352 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
3353 if (!ext4_fill_flex_info(sb
)) {
3354 ext4_msg(sb
, KERN_ERR
,
3355 "unable to initialize "
3356 "flex_bg meta info!");
3360 sbi
->s_gdb_count
= db_count
;
3361 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
3362 spin_lock_init(&sbi
->s_next_gen_lock
);
3364 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
3365 sbi
->s_max_writeback_mb_bump
= 128;
3368 * set up enough so that it can read an inode
3370 if (!test_opt(sb
, NOLOAD
) &&
3371 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
3372 sb
->s_op
= &ext4_sops
;
3374 sb
->s_op
= &ext4_nojournal_sops
;
3375 sb
->s_export_op
= &ext4_export_ops
;
3376 sb
->s_xattr
= ext4_xattr_handlers
;
3378 sb
->s_qcop
= &ext4_qctl_operations
;
3379 sb
->dq_op
= &ext4_quota_operations
;
3381 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
3382 mutex_init(&sbi
->s_orphan_lock
);
3383 mutex_init(&sbi
->s_resize_lock
);
3387 needs_recovery
= (es
->s_last_orphan
!= 0 ||
3388 EXT4_HAS_INCOMPAT_FEATURE(sb
,
3389 EXT4_FEATURE_INCOMPAT_RECOVER
));
3392 * The first inode we look at is the journal inode. Don't try
3393 * root first: it may be modified in the journal!
3395 if (!test_opt(sb
, NOLOAD
) &&
3396 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
3397 if (ext4_load_journal(sb
, es
, journal_devnum
))
3399 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
3400 EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3401 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
3402 "suppressed and not mounted read-only");
3403 goto failed_mount_wq
;
3405 clear_opt(sbi
->s_mount_opt
, DATA_FLAGS
);
3406 set_opt(sbi
->s_mount_opt
, WRITEBACK_DATA
);
3407 sbi
->s_journal
= NULL
;
3412 if (ext4_blocks_count(es
) > 0xffffffffULL
&&
3413 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
3414 JBD2_FEATURE_INCOMPAT_64BIT
)) {
3415 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
3416 goto failed_mount_wq
;
3419 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
3420 jbd2_journal_set_features(sbi
->s_journal
,
3421 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
3422 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3423 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
3424 jbd2_journal_set_features(sbi
->s_journal
,
3425 JBD2_FEATURE_COMPAT_CHECKSUM
, 0, 0);
3426 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3427 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3429 jbd2_journal_clear_features(sbi
->s_journal
,
3430 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
3431 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3434 /* We have now updated the journal if required, so we can
3435 * validate the data journaling mode. */
3436 switch (test_opt(sb
, DATA_FLAGS
)) {
3438 /* No mode set, assume a default based on the journal
3439 * capabilities: ORDERED_DATA if the journal can
3440 * cope, else JOURNAL_DATA
3442 if (jbd2_journal_check_available_features
3443 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
3444 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
3446 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
3449 case EXT4_MOUNT_ORDERED_DATA
:
3450 case EXT4_MOUNT_WRITEBACK_DATA
:
3451 if (!jbd2_journal_check_available_features
3452 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
3453 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
3454 "requested data journaling mode");
3455 goto failed_mount_wq
;
3460 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
3463 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
3464 ext4_count_free_blocks(sb
));
3466 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
3467 ext4_count_free_inodes(sb
));
3469 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
3470 ext4_count_dirs(sb
));
3472 err
= percpu_counter_init(&sbi
->s_dirtyblocks_counter
, 0);
3474 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
3475 goto failed_mount_wq
;
3478 EXT4_SB(sb
)->dio_unwritten_wq
= create_workqueue("ext4-dio-unwritten");
3479 if (!EXT4_SB(sb
)->dio_unwritten_wq
) {
3480 printk(KERN_ERR
"EXT4-fs: failed to create DIO workqueue\n");
3481 goto failed_mount_wq
;
3485 * The jbd2_journal_load will have done any necessary log recovery,
3486 * so we can safely mount the rest of the filesystem now.
3489 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
3491 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
3492 ret
= PTR_ERR(root
);
3495 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
3497 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
3500 sb
->s_root
= d_alloc_root(root
);
3502 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
3508 ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
);
3510 /* determine the minimum size of new large inodes, if present */
3511 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
3512 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
3513 EXT4_GOOD_OLD_INODE_SIZE
;
3514 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3515 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
3516 if (sbi
->s_want_extra_isize
<
3517 le16_to_cpu(es
->s_want_extra_isize
))
3518 sbi
->s_want_extra_isize
=
3519 le16_to_cpu(es
->s_want_extra_isize
);
3520 if (sbi
->s_want_extra_isize
<
3521 le16_to_cpu(es
->s_min_extra_isize
))
3522 sbi
->s_want_extra_isize
=
3523 le16_to_cpu(es
->s_min_extra_isize
);
3526 /* Check if enough inode space is available */
3527 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
3528 sbi
->s_inode_size
) {
3529 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
3530 EXT4_GOOD_OLD_INODE_SIZE
;
3531 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
3535 if (test_opt(sb
, DELALLOC
) &&
3536 (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)) {
3537 ext4_msg(sb
, KERN_WARNING
, "Ignoring delalloc option - "
3538 "requested data journaling mode");
3539 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
3541 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
3542 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
3543 ext4_msg(sb
, KERN_WARNING
, "Ignoring dioread_nolock "
3544 "option - requested data journaling mode");
3545 clear_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
3547 if (sb
->s_blocksize
< PAGE_SIZE
) {
3548 ext4_msg(sb
, KERN_WARNING
, "Ignoring dioread_nolock "
3549 "option - block size is too small");
3550 clear_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
3554 err
= ext4_setup_system_zone(sb
);
3556 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
3562 err
= ext4_mb_init(sb
, needs_recovery
);
3564 ext4_msg(sb
, KERN_ERR
, "failed to initialize mballoc (%d)",
3569 err
= ext4_register_li_request(sb
, first_not_zeroed
);
3573 sbi
->s_kobj
.kset
= ext4_kset
;
3574 init_completion(&sbi
->s_kobj_unregister
);
3575 err
= kobject_init_and_add(&sbi
->s_kobj
, &ext4_ktype
, NULL
,
3578 ext4_mb_release(sb
);
3579 ext4_ext_release(sb
);
3583 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
3584 ext4_orphan_cleanup(sb
, es
);
3585 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
3586 if (needs_recovery
) {
3587 ext4_msg(sb
, KERN_INFO
, "recovery complete");
3588 ext4_mark_recovery_complete(sb
, es
);
3590 if (EXT4_SB(sb
)->s_journal
) {
3591 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
3592 descr
= " journalled data mode";
3593 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
3594 descr
= " ordered data mode";
3596 descr
= " writeback data mode";
3598 descr
= "out journal";
3600 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s. "
3601 "Opts: %s%s%s", descr
, sbi
->s_es
->s_mount_opts
,
3602 *sbi
->s_es
->s_mount_opts
? "; " : "", orig_data
);
3604 init_timer(&sbi
->s_err_report
);
3605 sbi
->s_err_report
.function
= print_daily_error_info
;
3606 sbi
->s_err_report
.data
= (unsigned long) sb
;
3607 if (es
->s_error_count
)
3608 mod_timer(&sbi
->s_err_report
, jiffies
+ 300*HZ
); /* 5 minutes */
3616 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
3620 ext4_msg(sb
, KERN_ERR
, "mount failed");
3621 destroy_workqueue(EXT4_SB(sb
)->dio_unwritten_wq
);
3623 ext4_release_system_zone(sb
);
3624 if (sbi
->s_journal
) {
3625 jbd2_journal_destroy(sbi
->s_journal
);
3626 sbi
->s_journal
= NULL
;
3628 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
3629 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
3630 percpu_counter_destroy(&sbi
->s_dirs_counter
);
3631 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
3633 if (sbi
->s_flex_groups
) {
3634 if (is_vmalloc_addr(sbi
->s_flex_groups
))
3635 vfree(sbi
->s_flex_groups
);
3637 kfree(sbi
->s_flex_groups
);
3640 for (i
= 0; i
< db_count
; i
++)
3641 brelse(sbi
->s_group_desc
[i
]);
3642 kfree(sbi
->s_group_desc
);
3645 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
3648 for (i
= 0; i
< MAXQUOTAS
; i
++)
3649 kfree(sbi
->s_qf_names
[i
]);
3651 ext4_blkdev_remove(sbi
);
3654 sb
->s_fs_info
= NULL
;
3655 kfree(sbi
->s_blockgroup_lock
);
3664 * Setup any per-fs journal parameters now. We'll do this both on
3665 * initial mount, once the journal has been initialised but before we've
3666 * done any recovery; and again on any subsequent remount.
3668 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
3670 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3672 journal
->j_commit_interval
= sbi
->s_commit_interval
;
3673 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
3674 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
3676 write_lock(&journal
->j_state_lock
);
3677 if (test_opt(sb
, BARRIER
))
3678 journal
->j_flags
|= JBD2_BARRIER
;
3680 journal
->j_flags
&= ~JBD2_BARRIER
;
3681 if (test_opt(sb
, DATA_ERR_ABORT
))
3682 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
3684 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
3685 write_unlock(&journal
->j_state_lock
);
3688 static journal_t
*ext4_get_journal(struct super_block
*sb
,
3689 unsigned int journal_inum
)
3691 struct inode
*journal_inode
;
3694 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3696 /* First, test for the existence of a valid inode on disk. Bad
3697 * things happen if we iget() an unused inode, as the subsequent
3698 * iput() will try to delete it. */
3700 journal_inode
= ext4_iget(sb
, journal_inum
);
3701 if (IS_ERR(journal_inode
)) {
3702 ext4_msg(sb
, KERN_ERR
, "no journal found");
3705 if (!journal_inode
->i_nlink
) {
3706 make_bad_inode(journal_inode
);
3707 iput(journal_inode
);
3708 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
3712 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3713 journal_inode
, journal_inode
->i_size
);
3714 if (!S_ISREG(journal_inode
->i_mode
)) {
3715 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
3716 iput(journal_inode
);
3720 journal
= jbd2_journal_init_inode(journal_inode
);
3722 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
3723 iput(journal_inode
);
3726 journal
->j_private
= sb
;
3727 ext4_init_journal_params(sb
, journal
);
3731 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
3734 struct buffer_head
*bh
;
3738 int hblock
, blocksize
;
3739 ext4_fsblk_t sb_block
;
3740 unsigned long offset
;
3741 struct ext4_super_block
*es
;
3742 struct block_device
*bdev
;
3744 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3746 bdev
= ext4_blkdev_get(j_dev
, sb
);
3750 if (bd_claim(bdev
, sb
)) {
3751 ext4_msg(sb
, KERN_ERR
,
3752 "failed to claim external journal device");
3753 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
3757 blocksize
= sb
->s_blocksize
;
3758 hblock
= bdev_logical_block_size(bdev
);
3759 if (blocksize
< hblock
) {
3760 ext4_msg(sb
, KERN_ERR
,
3761 "blocksize too small for journal device");
3765 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
3766 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
3767 set_blocksize(bdev
, blocksize
);
3768 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
3769 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
3770 "external journal");
3774 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
3775 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
3776 !(le32_to_cpu(es
->s_feature_incompat
) &
3777 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
3778 ext4_msg(sb
, KERN_ERR
, "external journal has "
3784 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
3785 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
3790 len
= ext4_blocks_count(es
);
3791 start
= sb_block
+ 1;
3792 brelse(bh
); /* we're done with the superblock */
3794 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
3795 start
, len
, blocksize
);
3797 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
3800 journal
->j_private
= sb
;
3801 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
3802 wait_on_buffer(journal
->j_sb_buffer
);
3803 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
3804 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
3807 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
3808 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
3809 "user (unsupported) - %d",
3810 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
3813 EXT4_SB(sb
)->journal_bdev
= bdev
;
3814 ext4_init_journal_params(sb
, journal
);
3818 jbd2_journal_destroy(journal
);
3820 ext4_blkdev_put(bdev
);
3824 static int ext4_load_journal(struct super_block
*sb
,
3825 struct ext4_super_block
*es
,
3826 unsigned long journal_devnum
)
3829 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
3832 int really_read_only
;
3834 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3836 if (journal_devnum
&&
3837 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3838 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
3839 "numbers have changed");
3840 journal_dev
= new_decode_dev(journal_devnum
);
3842 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
3844 really_read_only
= bdev_read_only(sb
->s_bdev
);
3847 * Are we loading a blank journal or performing recovery after a
3848 * crash? For recovery, we need to check in advance whether we
3849 * can get read-write access to the device.
3851 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3852 if (sb
->s_flags
& MS_RDONLY
) {
3853 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
3854 "required on readonly filesystem");
3855 if (really_read_only
) {
3856 ext4_msg(sb
, KERN_ERR
, "write access "
3857 "unavailable, cannot proceed");
3860 ext4_msg(sb
, KERN_INFO
, "write access will "
3861 "be enabled during recovery");
3865 if (journal_inum
&& journal_dev
) {
3866 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
3867 "and inode journals!");
3872 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
3875 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
3879 if (!(journal
->j_flags
& JBD2_BARRIER
))
3880 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
3882 if (!really_read_only
&& test_opt(sb
, UPDATE_JOURNAL
)) {
3883 err
= jbd2_journal_update_format(journal
);
3885 ext4_msg(sb
, KERN_ERR
, "error updating journal");
3886 jbd2_journal_destroy(journal
);
3891 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
3892 err
= jbd2_journal_wipe(journal
, !really_read_only
);
3894 char *save
= kmalloc(EXT4_S_ERR_LEN
, GFP_KERNEL
);
3896 memcpy(save
, ((char *) es
) +
3897 EXT4_S_ERR_START
, EXT4_S_ERR_LEN
);
3898 err
= jbd2_journal_load(journal
);
3900 memcpy(((char *) es
) + EXT4_S_ERR_START
,
3901 save
, EXT4_S_ERR_LEN
);
3906 ext4_msg(sb
, KERN_ERR
, "error loading journal");
3907 jbd2_journal_destroy(journal
);
3911 EXT4_SB(sb
)->s_journal
= journal
;
3912 ext4_clear_journal_err(sb
, es
);
3914 if (!really_read_only
&& journal_devnum
&&
3915 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3916 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
3918 /* Make sure we flush the recovery flag to disk. */
3919 ext4_commit_super(sb
, 1);
3925 static int ext4_commit_super(struct super_block
*sb
, int sync
)
3927 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
3928 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
3933 if (buffer_write_io_error(sbh
)) {
3935 * Oh, dear. A previous attempt to write the
3936 * superblock failed. This could happen because the
3937 * USB device was yanked out. Or it could happen to
3938 * be a transient write error and maybe the block will
3939 * be remapped. Nothing we can do but to retry the
3940 * write and hope for the best.
3942 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
3943 "superblock detected");
3944 clear_buffer_write_io_error(sbh
);
3945 set_buffer_uptodate(sbh
);
3948 * If the file system is mounted read-only, don't update the
3949 * superblock write time. This avoids updating the superblock
3950 * write time when we are mounting the root file system
3951 * read/only but we need to replay the journal; at that point,
3952 * for people who are east of GMT and who make their clock
3953 * tick in localtime for Windows bug-for-bug compatibility,
3954 * the clock is set in the future, and this will cause e2fsck
3955 * to complain and force a full file system check.
3957 if (!(sb
->s_flags
& MS_RDONLY
))
3958 es
->s_wtime
= cpu_to_le32(get_seconds());
3959 if (sb
->s_bdev
->bd_part
)
3960 es
->s_kbytes_written
=
3961 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
3962 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
3963 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
3965 es
->s_kbytes_written
=
3966 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
);
3967 if (percpu_counter_initialized(&EXT4_SB(sb
)->s_freeblocks_counter
))
3968 ext4_free_blocks_count_set(es
, percpu_counter_sum_positive(
3969 &EXT4_SB(sb
)->s_freeblocks_counter
));
3970 if (percpu_counter_initialized(&EXT4_SB(sb
)->s_freeinodes_counter
))
3971 es
->s_free_inodes_count
=
3972 cpu_to_le32(percpu_counter_sum_positive(
3973 &EXT4_SB(sb
)->s_freeinodes_counter
));
3975 BUFFER_TRACE(sbh
, "marking dirty");
3976 mark_buffer_dirty(sbh
);
3978 error
= sync_dirty_buffer(sbh
);
3982 error
= buffer_write_io_error(sbh
);
3984 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
3986 clear_buffer_write_io_error(sbh
);
3987 set_buffer_uptodate(sbh
);
3994 * Have we just finished recovery? If so, and if we are mounting (or
3995 * remounting) the filesystem readonly, then we will end up with a
3996 * consistent fs on disk. Record that fact.
3998 static void ext4_mark_recovery_complete(struct super_block
*sb
,
3999 struct ext4_super_block
*es
)
4001 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
4003 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
4004 BUG_ON(journal
!= NULL
);
4007 jbd2_journal_lock_updates(journal
);
4008 if (jbd2_journal_flush(journal
) < 0)
4011 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
4012 sb
->s_flags
& MS_RDONLY
) {
4013 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4014 ext4_commit_super(sb
, 1);
4018 jbd2_journal_unlock_updates(journal
);
4022 * If we are mounting (or read-write remounting) a filesystem whose journal
4023 * has recorded an error from a previous lifetime, move that error to the
4024 * main filesystem now.
4026 static void ext4_clear_journal_err(struct super_block
*sb
,
4027 struct ext4_super_block
*es
)
4033 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4035 journal
= EXT4_SB(sb
)->s_journal
;
4038 * Now check for any error status which may have been recorded in the
4039 * journal by a prior ext4_error() or ext4_abort()
4042 j_errno
= jbd2_journal_errno(journal
);
4046 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
4047 ext4_warning(sb
, "Filesystem error recorded "
4048 "from previous mount: %s", errstr
);
4049 ext4_warning(sb
, "Marking fs in need of filesystem check.");
4051 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
4052 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
4053 ext4_commit_super(sb
, 1);
4055 jbd2_journal_clear_err(journal
);
4060 * Force the running and committing transactions to commit,
4061 * and wait on the commit.
4063 int ext4_force_commit(struct super_block
*sb
)
4068 if (sb
->s_flags
& MS_RDONLY
)
4071 journal
= EXT4_SB(sb
)->s_journal
;
4073 vfs_check_frozen(sb
, SB_FREEZE_TRANS
);
4074 ret
= ext4_journal_force_commit(journal
);
4080 static void ext4_write_super(struct super_block
*sb
)
4083 ext4_commit_super(sb
, 1);
4087 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
4091 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4093 trace_ext4_sync_fs(sb
, wait
);
4094 flush_workqueue(sbi
->dio_unwritten_wq
);
4095 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
4097 jbd2_log_wait_commit(sbi
->s_journal
, target
);
4103 * LVM calls this function before a (read-only) snapshot is created. This
4104 * gives us a chance to flush the journal completely and mark the fs clean.
4106 static int ext4_freeze(struct super_block
*sb
)
4111 if (sb
->s_flags
& MS_RDONLY
)
4114 journal
= EXT4_SB(sb
)->s_journal
;
4116 /* Now we set up the journal barrier. */
4117 jbd2_journal_lock_updates(journal
);
4120 * Don't clear the needs_recovery flag if we failed to flush
4123 error
= jbd2_journal_flush(journal
);
4127 /* Journal blocked and flushed, clear needs_recovery flag. */
4128 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4129 error
= ext4_commit_super(sb
, 1);
4131 /* we rely on s_frozen to stop further updates */
4132 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
4137 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4138 * flag here, even though the filesystem is not technically dirty yet.
4140 static int ext4_unfreeze(struct super_block
*sb
)
4142 if (sb
->s_flags
& MS_RDONLY
)
4146 /* Reset the needs_recovery flag before the fs is unlocked. */
4147 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4148 ext4_commit_super(sb
, 1);
4153 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
4155 struct ext4_super_block
*es
;
4156 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4157 ext4_fsblk_t n_blocks_count
= 0;
4158 unsigned long old_sb_flags
;
4159 struct ext4_mount_options old_opts
;
4160 int enable_quota
= 0;
4162 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
4167 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
4171 /* Store the original options */
4173 old_sb_flags
= sb
->s_flags
;
4174 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
4175 old_opts
.s_resuid
= sbi
->s_resuid
;
4176 old_opts
.s_resgid
= sbi
->s_resgid
;
4177 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
4178 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
4179 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
4181 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
4182 for (i
= 0; i
< MAXQUOTAS
; i
++)
4183 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
4185 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
4186 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
4189 * Allow the "check" option to be passed as a remount option.
4191 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
,
4192 &n_blocks_count
, 1)) {
4197 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
4198 ext4_abort(sb
, "Abort forced by user");
4200 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
4201 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
4205 if (sbi
->s_journal
) {
4206 ext4_init_journal_params(sb
, sbi
->s_journal
);
4207 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
4210 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
) ||
4211 n_blocks_count
> ext4_blocks_count(es
)) {
4212 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
4217 if (*flags
& MS_RDONLY
) {
4218 err
= dquot_suspend(sb
, -1);
4223 * First of all, the unconditional stuff we have to do
4224 * to disable replay of the journal when we next remount
4226 sb
->s_flags
|= MS_RDONLY
;
4229 * OK, test if we are remounting a valid rw partition
4230 * readonly, and if so set the rdonly flag and then
4231 * mark the partition as valid again.
4233 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
4234 (sbi
->s_mount_state
& EXT4_VALID_FS
))
4235 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
4238 ext4_mark_recovery_complete(sb
, es
);
4240 /* Make sure we can mount this feature set readwrite */
4241 if (!ext4_feature_set_ok(sb
, 0)) {
4246 * Make sure the group descriptor checksums
4247 * are sane. If they aren't, refuse to remount r/w.
4249 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
4250 struct ext4_group_desc
*gdp
=
4251 ext4_get_group_desc(sb
, g
, NULL
);
4253 if (!ext4_group_desc_csum_verify(sbi
, g
, gdp
)) {
4254 ext4_msg(sb
, KERN_ERR
,
4255 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4256 g
, le16_to_cpu(ext4_group_desc_csum(sbi
, g
, gdp
)),
4257 le16_to_cpu(gdp
->bg_checksum
));
4264 * If we have an unprocessed orphan list hanging
4265 * around from a previously readonly bdev mount,
4266 * require a full umount/remount for now.
4268 if (es
->s_last_orphan
) {
4269 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
4270 "remount RDWR because of unprocessed "
4271 "orphan inode list. Please "
4272 "umount/remount instead");
4278 * Mounting a RDONLY partition read-write, so reread
4279 * and store the current valid flag. (It may have
4280 * been changed by e2fsck since we originally mounted
4284 ext4_clear_journal_err(sb
, es
);
4285 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
4286 if ((err
= ext4_group_extend(sb
, es
, n_blocks_count
)))
4288 if (!ext4_setup_super(sb
, es
, 0))
4289 sb
->s_flags
&= ~MS_RDONLY
;
4295 * Reinitialize lazy itable initialization thread based on
4298 if ((sb
->s_flags
& MS_RDONLY
) || !test_opt(sb
, INIT_INODE_TABLE
))
4299 ext4_unregister_li_request(sb
);
4301 ext4_group_t first_not_zeroed
;
4302 first_not_zeroed
= ext4_has_uninit_itable(sb
);
4303 ext4_register_li_request(sb
, first_not_zeroed
);
4306 ext4_setup_system_zone(sb
);
4307 if (sbi
->s_journal
== NULL
)
4308 ext4_commit_super(sb
, 1);
4311 /* Release old quota file names */
4312 for (i
= 0; i
< MAXQUOTAS
; i
++)
4313 if (old_opts
.s_qf_names
[i
] &&
4314 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
4315 kfree(old_opts
.s_qf_names
[i
]);
4320 dquot_resume(sb
, -1);
4322 ext4_msg(sb
, KERN_INFO
, "re-mounted. Opts: %s", orig_data
);
4327 sb
->s_flags
= old_sb_flags
;
4328 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
4329 sbi
->s_resuid
= old_opts
.s_resuid
;
4330 sbi
->s_resgid
= old_opts
.s_resgid
;
4331 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
4332 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
4333 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
4335 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
4336 for (i
= 0; i
< MAXQUOTAS
; i
++) {
4337 if (sbi
->s_qf_names
[i
] &&
4338 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
4339 kfree(sbi
->s_qf_names
[i
]);
4340 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
4349 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
4351 struct super_block
*sb
= dentry
->d_sb
;
4352 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4353 struct ext4_super_block
*es
= sbi
->s_es
;
4356 if (test_opt(sb
, MINIX_DF
)) {
4357 sbi
->s_overhead_last
= 0;
4358 } else if (sbi
->s_blocks_last
!= ext4_blocks_count(es
)) {
4359 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
4360 ext4_fsblk_t overhead
= 0;
4363 * Compute the overhead (FS structures). This is constant
4364 * for a given filesystem unless the number of block groups
4365 * changes so we cache the previous value until it does.
4369 * All of the blocks before first_data_block are
4372 overhead
= le32_to_cpu(es
->s_first_data_block
);
4375 * Add the overhead attributed to the superblock and
4376 * block group descriptors. If the sparse superblocks
4377 * feature is turned on, then not all groups have this.
4379 for (i
= 0; i
< ngroups
; i
++) {
4380 overhead
+= ext4_bg_has_super(sb
, i
) +
4381 ext4_bg_num_gdb(sb
, i
);
4386 * Every block group has an inode bitmap, a block
4387 * bitmap, and an inode table.
4389 overhead
+= ngroups
* (2 + sbi
->s_itb_per_group
);
4390 sbi
->s_overhead_last
= overhead
;
4392 sbi
->s_blocks_last
= ext4_blocks_count(es
);
4395 buf
->f_type
= EXT4_SUPER_MAGIC
;
4396 buf
->f_bsize
= sb
->s_blocksize
;
4397 buf
->f_blocks
= ext4_blocks_count(es
) - sbi
->s_overhead_last
;
4398 buf
->f_bfree
= percpu_counter_sum_positive(&sbi
->s_freeblocks_counter
) -
4399 percpu_counter_sum_positive(&sbi
->s_dirtyblocks_counter
);
4400 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
4401 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
4403 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
4404 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
4405 buf
->f_namelen
= EXT4_NAME_LEN
;
4406 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
4407 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
4408 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
4409 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
4414 /* Helper function for writing quotas on sync - we need to start transaction
4415 * before quota file is locked for write. Otherwise the are possible deadlocks:
4416 * Process 1 Process 2
4417 * ext4_create() quota_sync()
4418 * jbd2_journal_start() write_dquot()
4419 * dquot_initialize() down(dqio_mutex)
4420 * down(dqio_mutex) jbd2_journal_start()
4426 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
4428 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_type
];
4431 static int ext4_write_dquot(struct dquot
*dquot
)
4435 struct inode
*inode
;
4437 inode
= dquot_to_inode(dquot
);
4438 handle
= ext4_journal_start(inode
,
4439 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
4441 return PTR_ERR(handle
);
4442 ret
= dquot_commit(dquot
);
4443 err
= ext4_journal_stop(handle
);
4449 static int ext4_acquire_dquot(struct dquot
*dquot
)
4454 handle
= ext4_journal_start(dquot_to_inode(dquot
),
4455 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
4457 return PTR_ERR(handle
);
4458 ret
= dquot_acquire(dquot
);
4459 err
= ext4_journal_stop(handle
);
4465 static int ext4_release_dquot(struct dquot
*dquot
)
4470 handle
= ext4_journal_start(dquot_to_inode(dquot
),
4471 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
4472 if (IS_ERR(handle
)) {
4473 /* Release dquot anyway to avoid endless cycle in dqput() */
4474 dquot_release(dquot
);
4475 return PTR_ERR(handle
);
4477 ret
= dquot_release(dquot
);
4478 err
= ext4_journal_stop(handle
);
4484 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
4486 /* Are we journaling quotas? */
4487 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
4488 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
4489 dquot_mark_dquot_dirty(dquot
);
4490 return ext4_write_dquot(dquot
);
4492 return dquot_mark_dquot_dirty(dquot
);
4496 static int ext4_write_info(struct super_block
*sb
, int type
)
4501 /* Data block + inode block */
4502 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
4504 return PTR_ERR(handle
);
4505 ret
= dquot_commit_info(sb
, type
);
4506 err
= ext4_journal_stop(handle
);
4513 * Turn on quotas during mount time - we need to find
4514 * the quota file and such...
4516 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
4518 return dquot_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
4519 EXT4_SB(sb
)->s_jquota_fmt
, type
);
4523 * Standard function to be called on quota_on
4525 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
4531 if (!test_opt(sb
, QUOTA
))
4534 err
= kern_path(name
, LOOKUP_FOLLOW
, &path
);
4538 /* Quotafile not on the same filesystem? */
4539 if (path
.mnt
->mnt_sb
!= sb
) {
4543 /* Journaling quota? */
4544 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
4545 /* Quotafile not in fs root? */
4546 if (path
.dentry
->d_parent
!= sb
->s_root
)
4547 ext4_msg(sb
, KERN_WARNING
,
4548 "Quota file not on filesystem root. "
4549 "Journaled quota will not work");
4553 * When we journal data on quota file, we have to flush journal to see
4554 * all updates to the file when we bypass pagecache...
4556 if (EXT4_SB(sb
)->s_journal
&&
4557 ext4_should_journal_data(path
.dentry
->d_inode
)) {
4559 * We don't need to lock updates but journal_flush() could
4560 * otherwise be livelocked...
4562 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
4563 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
4564 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
4571 err
= dquot_quota_on_path(sb
, type
, format_id
, &path
);
4576 static int ext4_quota_off(struct super_block
*sb
, int type
)
4578 /* Force all delayed allocation blocks to be allocated */
4579 if (test_opt(sb
, DELALLOC
)) {
4580 down_read(&sb
->s_umount
);
4581 sync_filesystem(sb
);
4582 up_read(&sb
->s_umount
);
4585 return dquot_quota_off(sb
, type
);
4588 /* Read data from quotafile - avoid pagecache and such because we cannot afford
4589 * acquiring the locks... As quota files are never truncated and quota code
4590 * itself serializes the operations (and noone else should touch the files)
4591 * we don't have to be afraid of races */
4592 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
4593 size_t len
, loff_t off
)
4595 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
4596 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
4598 int offset
= off
& (sb
->s_blocksize
- 1);
4601 struct buffer_head
*bh
;
4602 loff_t i_size
= i_size_read(inode
);
4606 if (off
+len
> i_size
)
4609 while (toread
> 0) {
4610 tocopy
= sb
->s_blocksize
- offset
< toread
?
4611 sb
->s_blocksize
- offset
: toread
;
4612 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
4615 if (!bh
) /* A hole? */
4616 memset(data
, 0, tocopy
);
4618 memcpy(data
, bh
->b_data
+offset
, tocopy
);
4628 /* Write to quotafile (we know the transaction is already started and has
4629 * enough credits) */
4630 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
4631 const char *data
, size_t len
, loff_t off
)
4633 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
4634 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
4636 int offset
= off
& (sb
->s_blocksize
- 1);
4637 struct buffer_head
*bh
;
4638 handle_t
*handle
= journal_current_handle();
4640 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
4641 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
4642 " cancelled because transaction is not started",
4643 (unsigned long long)off
, (unsigned long long)len
);
4647 * Since we account only one data block in transaction credits,
4648 * then it is impossible to cross a block boundary.
4650 if (sb
->s_blocksize
- offset
< len
) {
4651 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
4652 " cancelled because not block aligned",
4653 (unsigned long long)off
, (unsigned long long)len
);
4657 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
4658 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
4661 err
= ext4_journal_get_write_access(handle
, bh
);
4667 memcpy(bh
->b_data
+offset
, data
, len
);
4668 flush_dcache_page(bh
->b_page
);
4670 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
4674 mutex_unlock(&inode
->i_mutex
);
4677 if (inode
->i_size
< off
+ len
) {
4678 i_size_write(inode
, off
+ len
);
4679 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
4681 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
4682 ext4_mark_inode_dirty(handle
, inode
);
4683 mutex_unlock(&inode
->i_mutex
);
4689 static int ext4_get_sb(struct file_system_type
*fs_type
, int flags
,
4690 const char *dev_name
, void *data
, struct vfsmount
*mnt
)
4692 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
,mnt
);
4695 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4696 static struct file_system_type ext2_fs_type
= {
4697 .owner
= THIS_MODULE
,
4699 .get_sb
= ext4_get_sb
,
4700 .kill_sb
= kill_block_super
,
4701 .fs_flags
= FS_REQUIRES_DEV
,
4704 static inline void register_as_ext2(void)
4706 int err
= register_filesystem(&ext2_fs_type
);
4709 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
4712 static inline void unregister_as_ext2(void)
4714 unregister_filesystem(&ext2_fs_type
);
4716 MODULE_ALIAS("ext2");
4718 static inline void register_as_ext2(void) { }
4719 static inline void unregister_as_ext2(void) { }
4722 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4723 static inline void register_as_ext3(void)
4725 int err
= register_filesystem(&ext3_fs_type
);
4728 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
4731 static inline void unregister_as_ext3(void)
4733 unregister_filesystem(&ext3_fs_type
);
4735 MODULE_ALIAS("ext3");
4737 static inline void register_as_ext3(void) { }
4738 static inline void unregister_as_ext3(void) { }
4741 static struct file_system_type ext4_fs_type
= {
4742 .owner
= THIS_MODULE
,
4744 .get_sb
= ext4_get_sb
,
4745 .kill_sb
= kill_block_super
,
4746 .fs_flags
= FS_REQUIRES_DEV
,
4749 int __init
ext4_init_feat_adverts(void)
4751 struct ext4_features
*ef
;
4754 ef
= kzalloc(sizeof(struct ext4_features
), GFP_KERNEL
);
4758 ef
->f_kobj
.kset
= ext4_kset
;
4759 init_completion(&ef
->f_kobj_unregister
);
4760 ret
= kobject_init_and_add(&ef
->f_kobj
, &ext4_feat_ktype
, NULL
,
4773 static int __init
init_ext4_fs(void)
4777 ext4_check_flag_values();
4778 err
= init_ext4_pageio();
4781 err
= init_ext4_system_zone();
4784 ext4_kset
= kset_create_and_add("ext4", NULL
, fs_kobj
);
4787 ext4_proc_root
= proc_mkdir("fs/ext4", NULL
);
4789 err
= ext4_init_feat_adverts();
4791 err
= init_ext4_mballoc();
4795 err
= init_ext4_xattr();
4798 err
= init_inodecache();
4803 err
= register_filesystem(&ext4_fs_type
);
4807 ext4_li_info
= NULL
;
4808 mutex_init(&ext4_li_mtx
);
4811 unregister_as_ext2();
4812 unregister_as_ext3();
4813 destroy_inodecache();
4817 exit_ext4_mballoc();
4820 remove_proc_entry("fs/ext4", NULL
);
4821 kset_unregister(ext4_kset
);
4823 exit_ext4_system_zone();
4829 static void __exit
exit_ext4_fs(void)
4831 ext4_destroy_lazyinit_thread();
4832 unregister_as_ext2();
4833 unregister_as_ext3();
4834 unregister_filesystem(&ext4_fs_type
);
4835 destroy_inodecache();
4837 exit_ext4_mballoc();
4838 remove_proc_entry("fs/ext4", NULL
);
4839 kset_unregister(ext4_kset
);
4840 exit_ext4_system_zone();
4844 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4845 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4846 MODULE_LICENSE("GPL");
4847 module_init(init_ext4_fs
)
4848 module_exit(exit_ext4_fs
)