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/buffer_head.h>
30 #include <linux/exportfs.h>
31 #include <linux/vfs.h>
32 #include <linux/random.h>
33 #include <linux/mount.h>
34 #include <linux/namei.h>
35 #include <linux/quotaops.h>
36 #include <linux/seq_file.h>
37 #include <linux/proc_fs.h>
38 #include <linux/ctype.h>
39 #include <linux/log2.h>
40 #include <linux/crc16.h>
41 #include <asm/uaccess.h>
43 #include <linux/kthread.h>
44 #include <linux/freezer.h>
47 #include "ext4_jbd2.h"
52 #define CREATE_TRACE_POINTS
53 #include <trace/events/ext4.h>
55 static struct proc_dir_entry
*ext4_proc_root
;
56 static struct kset
*ext4_kset
;
57 struct ext4_lazy_init
*ext4_li_info
;
58 struct mutex ext4_li_mtx
;
59 struct ext4_features
*ext4_feat
;
61 static int ext4_load_journal(struct super_block
*, struct ext4_super_block
*,
62 unsigned long journal_devnum
);
63 static int ext4_commit_super(struct super_block
*sb
, int sync
);
64 static void ext4_mark_recovery_complete(struct super_block
*sb
,
65 struct ext4_super_block
*es
);
66 static void ext4_clear_journal_err(struct super_block
*sb
,
67 struct ext4_super_block
*es
);
68 static int ext4_sync_fs(struct super_block
*sb
, int wait
);
69 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
71 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
);
72 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
);
73 static int ext4_unfreeze(struct super_block
*sb
);
74 static void ext4_write_super(struct super_block
*sb
);
75 static int ext4_freeze(struct super_block
*sb
);
76 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
77 const char *dev_name
, void *data
);
78 static void ext4_destroy_lazyinit_thread(void);
79 static void ext4_unregister_li_request(struct super_block
*sb
);
81 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
82 static struct file_system_type ext3_fs_type
= {
86 .kill_sb
= kill_block_super
,
87 .fs_flags
= FS_REQUIRES_DEV
,
89 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
91 #define IS_EXT3_SB(sb) (0)
94 ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
95 struct ext4_group_desc
*bg
)
97 return le32_to_cpu(bg
->bg_block_bitmap_lo
) |
98 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
99 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
102 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
103 struct ext4_group_desc
*bg
)
105 return le32_to_cpu(bg
->bg_inode_bitmap_lo
) |
106 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
107 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
110 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
111 struct ext4_group_desc
*bg
)
113 return le32_to_cpu(bg
->bg_inode_table_lo
) |
114 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
115 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
118 __u32
ext4_free_blks_count(struct super_block
*sb
,
119 struct ext4_group_desc
*bg
)
121 return le16_to_cpu(bg
->bg_free_blocks_count_lo
) |
122 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
123 (__u32
)le16_to_cpu(bg
->bg_free_blocks_count_hi
) << 16 : 0);
126 __u32
ext4_free_inodes_count(struct super_block
*sb
,
127 struct ext4_group_desc
*bg
)
129 return le16_to_cpu(bg
->bg_free_inodes_count_lo
) |
130 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
131 (__u32
)le16_to_cpu(bg
->bg_free_inodes_count_hi
) << 16 : 0);
134 __u32
ext4_used_dirs_count(struct super_block
*sb
,
135 struct ext4_group_desc
*bg
)
137 return le16_to_cpu(bg
->bg_used_dirs_count_lo
) |
138 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
139 (__u32
)le16_to_cpu(bg
->bg_used_dirs_count_hi
) << 16 : 0);
142 __u32
ext4_itable_unused_count(struct super_block
*sb
,
143 struct ext4_group_desc
*bg
)
145 return le16_to_cpu(bg
->bg_itable_unused_lo
) |
146 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
147 (__u32
)le16_to_cpu(bg
->bg_itable_unused_hi
) << 16 : 0);
150 void ext4_block_bitmap_set(struct super_block
*sb
,
151 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
153 bg
->bg_block_bitmap_lo
= cpu_to_le32((u32
)blk
);
154 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
155 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
158 void ext4_inode_bitmap_set(struct super_block
*sb
,
159 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
161 bg
->bg_inode_bitmap_lo
= cpu_to_le32((u32
)blk
);
162 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
163 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
166 void ext4_inode_table_set(struct super_block
*sb
,
167 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
169 bg
->bg_inode_table_lo
= cpu_to_le32((u32
)blk
);
170 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
171 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
174 void ext4_free_blks_set(struct super_block
*sb
,
175 struct ext4_group_desc
*bg
, __u32 count
)
177 bg
->bg_free_blocks_count_lo
= cpu_to_le16((__u16
)count
);
178 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
179 bg
->bg_free_blocks_count_hi
= cpu_to_le16(count
>> 16);
182 void ext4_free_inodes_set(struct super_block
*sb
,
183 struct ext4_group_desc
*bg
, __u32 count
)
185 bg
->bg_free_inodes_count_lo
= cpu_to_le16((__u16
)count
);
186 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
187 bg
->bg_free_inodes_count_hi
= cpu_to_le16(count
>> 16);
190 void ext4_used_dirs_set(struct super_block
*sb
,
191 struct ext4_group_desc
*bg
, __u32 count
)
193 bg
->bg_used_dirs_count_lo
= cpu_to_le16((__u16
)count
);
194 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
195 bg
->bg_used_dirs_count_hi
= cpu_to_le16(count
>> 16);
198 void ext4_itable_unused_set(struct super_block
*sb
,
199 struct ext4_group_desc
*bg
, __u32 count
)
201 bg
->bg_itable_unused_lo
= cpu_to_le16((__u16
)count
);
202 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
203 bg
->bg_itable_unused_hi
= cpu_to_le16(count
>> 16);
207 /* Just increment the non-pointer handle value */
208 static handle_t
*ext4_get_nojournal(void)
210 handle_t
*handle
= current
->journal_info
;
211 unsigned long ref_cnt
= (unsigned long)handle
;
213 BUG_ON(ref_cnt
>= EXT4_NOJOURNAL_MAX_REF_COUNT
);
216 handle
= (handle_t
*)ref_cnt
;
218 current
->journal_info
= handle
;
223 /* Decrement the non-pointer handle value */
224 static void ext4_put_nojournal(handle_t
*handle
)
226 unsigned long ref_cnt
= (unsigned long)handle
;
228 BUG_ON(ref_cnt
== 0);
231 handle
= (handle_t
*)ref_cnt
;
233 current
->journal_info
= handle
;
237 * Wrappers for jbd2_journal_start/end.
239 * The only special thing we need to do here is to make sure that all
240 * journal_end calls result in the superblock being marked dirty, so
241 * that sync() will call the filesystem's write_super callback if
244 handle_t
*ext4_journal_start_sb(struct super_block
*sb
, int nblocks
)
248 if (sb
->s_flags
& MS_RDONLY
)
249 return ERR_PTR(-EROFS
);
251 vfs_check_frozen(sb
, SB_FREEZE_TRANS
);
252 /* Special case here: if the journal has aborted behind our
253 * backs (eg. EIO in the commit thread), then we still need to
254 * take the FS itself readonly cleanly. */
255 journal
= EXT4_SB(sb
)->s_journal
;
257 if (is_journal_aborted(journal
)) {
258 ext4_abort(sb
, "Detected aborted journal");
259 return ERR_PTR(-EROFS
);
261 return jbd2_journal_start(journal
, nblocks
);
263 return ext4_get_nojournal();
267 * The only special thing we need to do here is to make sure that all
268 * jbd2_journal_stop calls result in the superblock being marked dirty, so
269 * that sync() will call the filesystem's write_super callback if
272 int __ext4_journal_stop(const char *where
, unsigned int line
, handle_t
*handle
)
274 struct super_block
*sb
;
278 if (!ext4_handle_valid(handle
)) {
279 ext4_put_nojournal(handle
);
282 sb
= handle
->h_transaction
->t_journal
->j_private
;
284 rc
= jbd2_journal_stop(handle
);
289 __ext4_std_error(sb
, where
, line
, err
);
293 void ext4_journal_abort_handle(const char *caller
, unsigned int line
,
294 const char *err_fn
, struct buffer_head
*bh
,
295 handle_t
*handle
, int err
)
298 const char *errstr
= ext4_decode_error(NULL
, err
, nbuf
);
300 BUG_ON(!ext4_handle_valid(handle
));
303 BUFFER_TRACE(bh
, "abort");
308 if (is_handle_aborted(handle
))
311 printk(KERN_ERR
"%s:%d: aborting transaction: %s in %s\n",
312 caller
, line
, errstr
, err_fn
);
314 jbd2_journal_abort_handle(handle
);
317 static void __save_error_info(struct super_block
*sb
, const char *func
,
320 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
322 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
323 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
324 es
->s_last_error_time
= cpu_to_le32(get_seconds());
325 strncpy(es
->s_last_error_func
, func
, sizeof(es
->s_last_error_func
));
326 es
->s_last_error_line
= cpu_to_le32(line
);
327 if (!es
->s_first_error_time
) {
328 es
->s_first_error_time
= es
->s_last_error_time
;
329 strncpy(es
->s_first_error_func
, func
,
330 sizeof(es
->s_first_error_func
));
331 es
->s_first_error_line
= cpu_to_le32(line
);
332 es
->s_first_error_ino
= es
->s_last_error_ino
;
333 es
->s_first_error_block
= es
->s_last_error_block
;
336 * Start the daily error reporting function if it hasn't been
339 if (!es
->s_error_count
)
340 mod_timer(&EXT4_SB(sb
)->s_err_report
, jiffies
+ 24*60*60*HZ
);
341 es
->s_error_count
= cpu_to_le32(le32_to_cpu(es
->s_error_count
) + 1);
344 static void save_error_info(struct super_block
*sb
, const char *func
,
347 __save_error_info(sb
, func
, line
);
348 ext4_commit_super(sb
, 1);
352 /* Deal with the reporting of failure conditions on a filesystem such as
353 * inconsistencies detected or read IO failures.
355 * On ext2, we can store the error state of the filesystem in the
356 * superblock. That is not possible on ext4, because we may have other
357 * write ordering constraints on the superblock which prevent us from
358 * writing it out straight away; and given that the journal is about to
359 * be aborted, we can't rely on the current, or future, transactions to
360 * write out the superblock safely.
362 * We'll just use the jbd2_journal_abort() error code to record an error in
363 * the journal instead. On recovery, the journal will complain about
364 * that error until we've noted it down and cleared it.
367 static void ext4_handle_error(struct super_block
*sb
)
369 if (sb
->s_flags
& MS_RDONLY
)
372 if (!test_opt(sb
, ERRORS_CONT
)) {
373 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
375 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
377 jbd2_journal_abort(journal
, -EIO
);
379 if (test_opt(sb
, ERRORS_RO
)) {
380 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
381 sb
->s_flags
|= MS_RDONLY
;
383 if (test_opt(sb
, ERRORS_PANIC
))
384 panic("EXT4-fs (device %s): panic forced after error\n",
388 void __ext4_error(struct super_block
*sb
, const char *function
,
389 unsigned int line
, const char *fmt
, ...)
394 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: comm %s: ",
395 sb
->s_id
, function
, line
, current
->comm
);
400 ext4_handle_error(sb
);
403 void ext4_error_inode(struct inode
*inode
, const char *function
,
404 unsigned int line
, ext4_fsblk_t block
,
405 const char *fmt
, ...)
408 struct ext4_super_block
*es
= EXT4_SB(inode
->i_sb
)->s_es
;
410 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
411 es
->s_last_error_block
= cpu_to_le64(block
);
412 save_error_info(inode
->i_sb
, function
, line
);
414 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: inode #%lu: ",
415 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
);
417 printk("block %llu: ", block
);
418 printk("comm %s: ", current
->comm
);
423 ext4_handle_error(inode
->i_sb
);
426 void ext4_error_file(struct file
*file
, const char *function
,
427 unsigned int line
, const char *fmt
, ...)
430 struct ext4_super_block
*es
;
431 struct inode
*inode
= file
->f_dentry
->d_inode
;
432 char pathname
[80], *path
;
434 es
= EXT4_SB(inode
->i_sb
)->s_es
;
435 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
436 save_error_info(inode
->i_sb
, function
, line
);
438 path
= d_path(&(file
->f_path
), pathname
, sizeof(pathname
));
442 "EXT4-fs error (device %s): %s:%d: inode #%lu "
443 "(comm %s path %s): ",
444 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
445 current
->comm
, path
);
450 ext4_handle_error(inode
->i_sb
);
453 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
460 errstr
= "IO failure";
463 errstr
= "Out of memory";
466 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
467 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
468 errstr
= "Journal has aborted";
470 errstr
= "Readonly filesystem";
473 /* If the caller passed in an extra buffer for unknown
474 * errors, textualise them now. Else we just return
477 /* Check for truncated error codes... */
478 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
487 /* __ext4_std_error decodes expected errors from journaling functions
488 * automatically and invokes the appropriate error response. */
490 void __ext4_std_error(struct super_block
*sb
, const char *function
,
491 unsigned int line
, int errno
)
496 /* Special case: if the error is EROFS, and we're not already
497 * inside a transaction, then there's really no point in logging
499 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
500 (sb
->s_flags
& MS_RDONLY
))
503 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
504 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s:%d: %s\n",
505 sb
->s_id
, function
, line
, errstr
);
506 save_error_info(sb
, function
, line
);
508 ext4_handle_error(sb
);
512 * ext4_abort is a much stronger failure handler than ext4_error. The
513 * abort function may be used to deal with unrecoverable failures such
514 * as journal IO errors or ENOMEM at a critical moment in log management.
516 * We unconditionally force the filesystem into an ABORT|READONLY state,
517 * unless the error response on the fs has been set to panic in which
518 * case we take the easy way out and panic immediately.
521 void __ext4_abort(struct super_block
*sb
, const char *function
,
522 unsigned int line
, const char *fmt
, ...)
526 save_error_info(sb
, function
, line
);
528 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: ", sb
->s_id
,
534 if ((sb
->s_flags
& MS_RDONLY
) == 0) {
535 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
536 sb
->s_flags
|= MS_RDONLY
;
537 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
538 if (EXT4_SB(sb
)->s_journal
)
539 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
540 save_error_info(sb
, function
, line
);
542 if (test_opt(sb
, ERRORS_PANIC
))
543 panic("EXT4-fs panic from previous error\n");
546 void ext4_msg (struct super_block
* sb
, const char *prefix
,
547 const char *fmt
, ...)
552 printk("%sEXT4-fs (%s): ", prefix
, sb
->s_id
);
558 void __ext4_warning(struct super_block
*sb
, const char *function
,
559 unsigned int line
, const char *fmt
, ...)
564 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: ",
565 sb
->s_id
, function
, line
);
571 void __ext4_grp_locked_error(const char *function
, unsigned int line
,
572 struct super_block
*sb
, ext4_group_t grp
,
573 unsigned long ino
, ext4_fsblk_t block
,
574 const char *fmt
, ...)
579 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
581 es
->s_last_error_ino
= cpu_to_le32(ino
);
582 es
->s_last_error_block
= cpu_to_le64(block
);
583 __save_error_info(sb
, function
, line
);
585 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: group %u",
586 sb
->s_id
, function
, line
, grp
);
588 printk("inode %lu: ", ino
);
590 printk("block %llu:", (unsigned long long) block
);
595 if (test_opt(sb
, ERRORS_CONT
)) {
596 ext4_commit_super(sb
, 0);
600 ext4_unlock_group(sb
, grp
);
601 ext4_handle_error(sb
);
603 * We only get here in the ERRORS_RO case; relocking the group
604 * may be dangerous, but nothing bad will happen since the
605 * filesystem will have already been marked read/only and the
606 * journal has been aborted. We return 1 as a hint to callers
607 * who might what to use the return value from
608 * ext4_grp_locked_error() to distinguish beween the
609 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
610 * aggressively from the ext4 function in question, with a
611 * more appropriate error code.
613 ext4_lock_group(sb
, grp
);
617 void ext4_update_dynamic_rev(struct super_block
*sb
)
619 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
621 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
625 "updating to rev %d because of new feature flag, "
626 "running e2fsck is recommended",
629 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
630 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
631 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
632 /* leave es->s_feature_*compat flags alone */
633 /* es->s_uuid will be set by e2fsck if empty */
636 * The rest of the superblock fields should be zero, and if not it
637 * means they are likely already in use, so leave them alone. We
638 * can leave it up to e2fsck to clean up any inconsistencies there.
643 * Open the external journal device
645 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
647 struct block_device
*bdev
;
648 char b
[BDEVNAME_SIZE
];
650 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
, sb
);
656 ext4_msg(sb
, KERN_ERR
, "failed to open journal device %s: %ld",
657 __bdevname(dev
, b
), PTR_ERR(bdev
));
662 * Release the journal device
664 static int ext4_blkdev_put(struct block_device
*bdev
)
666 return blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
669 static int ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
671 struct block_device
*bdev
;
674 bdev
= sbi
->journal_bdev
;
676 ret
= ext4_blkdev_put(bdev
);
677 sbi
->journal_bdev
= NULL
;
682 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
684 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
687 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
691 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
692 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
694 printk(KERN_ERR
"sb_info orphan list:\n");
695 list_for_each(l
, &sbi
->s_orphan
) {
696 struct inode
*inode
= orphan_list_entry(l
);
698 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
699 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
700 inode
->i_mode
, inode
->i_nlink
,
705 static void ext4_put_super(struct super_block
*sb
)
707 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
708 struct ext4_super_block
*es
= sbi
->s_es
;
711 ext4_unregister_li_request(sb
);
712 dquot_disable(sb
, -1, DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
714 flush_workqueue(sbi
->dio_unwritten_wq
);
715 destroy_workqueue(sbi
->dio_unwritten_wq
);
719 ext4_commit_super(sb
, 1);
721 if (sbi
->s_journal
) {
722 err
= jbd2_journal_destroy(sbi
->s_journal
);
723 sbi
->s_journal
= NULL
;
725 ext4_abort(sb
, "Couldn't clean up the journal");
728 del_timer(&sbi
->s_err_report
);
729 ext4_release_system_zone(sb
);
731 ext4_ext_release(sb
);
732 ext4_xattr_put_super(sb
);
734 if (!(sb
->s_flags
& MS_RDONLY
)) {
735 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
736 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
737 ext4_commit_super(sb
, 1);
740 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
742 kobject_del(&sbi
->s_kobj
);
744 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
745 brelse(sbi
->s_group_desc
[i
]);
746 kfree(sbi
->s_group_desc
);
747 if (is_vmalloc_addr(sbi
->s_flex_groups
))
748 vfree(sbi
->s_flex_groups
);
750 kfree(sbi
->s_flex_groups
);
751 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
752 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
753 percpu_counter_destroy(&sbi
->s_dirs_counter
);
754 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
757 for (i
= 0; i
< MAXQUOTAS
; i
++)
758 kfree(sbi
->s_qf_names
[i
]);
761 /* Debugging code just in case the in-memory inode orphan list
762 * isn't empty. The on-disk one can be non-empty if we've
763 * detected an error and taken the fs readonly, but the
764 * in-memory list had better be clean by this point. */
765 if (!list_empty(&sbi
->s_orphan
))
766 dump_orphan_list(sb
, sbi
);
767 J_ASSERT(list_empty(&sbi
->s_orphan
));
769 invalidate_bdev(sb
->s_bdev
);
770 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
772 * Invalidate the journal device's buffers. We don't want them
773 * floating about in memory - the physical journal device may
774 * hotswapped, and it breaks the `ro-after' testing code.
776 sync_blockdev(sbi
->journal_bdev
);
777 invalidate_bdev(sbi
->journal_bdev
);
778 ext4_blkdev_remove(sbi
);
780 sb
->s_fs_info
= NULL
;
782 * Now that we are completely done shutting down the
783 * superblock, we need to actually destroy the kobject.
786 kobject_put(&sbi
->s_kobj
);
787 wait_for_completion(&sbi
->s_kobj_unregister
);
788 kfree(sbi
->s_blockgroup_lock
);
792 static struct kmem_cache
*ext4_inode_cachep
;
795 * Called inside transaction, so use GFP_NOFS
797 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
799 struct ext4_inode_info
*ei
;
801 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
805 ei
->vfs_inode
.i_version
= 1;
806 ei
->vfs_inode
.i_data
.writeback_index
= 0;
807 memset(&ei
->i_cached_extent
, 0, sizeof(struct ext4_ext_cache
));
808 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
809 spin_lock_init(&ei
->i_prealloc_lock
);
811 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
812 * therefore it can be null here. Don't check it, just initialize
815 jbd2_journal_init_jbd_inode(&ei
->jinode
, &ei
->vfs_inode
);
816 ei
->i_reserved_data_blocks
= 0;
817 ei
->i_reserved_meta_blocks
= 0;
818 ei
->i_allocated_meta_blocks
= 0;
819 ei
->i_da_metadata_calc_len
= 0;
820 ei
->i_delalloc_reserved_flag
= 0;
821 spin_lock_init(&(ei
->i_block_reservation_lock
));
823 ei
->i_reserved_quota
= 0;
825 INIT_LIST_HEAD(&ei
->i_completed_io_list
);
826 spin_lock_init(&ei
->i_completed_io_lock
);
827 ei
->cur_aio_dio
= NULL
;
829 ei
->i_datasync_tid
= 0;
830 atomic_set(&ei
->i_ioend_count
, 0);
832 return &ei
->vfs_inode
;
835 static int ext4_drop_inode(struct inode
*inode
)
837 int drop
= generic_drop_inode(inode
);
839 trace_ext4_drop_inode(inode
, drop
);
843 static void ext4_destroy_inode(struct inode
*inode
)
845 ext4_ioend_wait(inode
);
846 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
847 ext4_msg(inode
->i_sb
, KERN_ERR
,
848 "Inode %lu (%p): orphan list check failed!",
849 inode
->i_ino
, EXT4_I(inode
));
850 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
851 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
855 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
858 static void init_once(void *foo
)
860 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
862 INIT_LIST_HEAD(&ei
->i_orphan
);
863 #ifdef CONFIG_EXT4_FS_XATTR
864 init_rwsem(&ei
->xattr_sem
);
866 init_rwsem(&ei
->i_data_sem
);
867 inode_init_once(&ei
->vfs_inode
);
870 static int init_inodecache(void)
872 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
873 sizeof(struct ext4_inode_info
),
874 0, (SLAB_RECLAIM_ACCOUNT
|
877 if (ext4_inode_cachep
== NULL
)
882 static void destroy_inodecache(void)
884 kmem_cache_destroy(ext4_inode_cachep
);
887 void ext4_clear_inode(struct inode
*inode
)
889 invalidate_inode_buffers(inode
);
890 end_writeback(inode
);
892 ext4_discard_preallocations(inode
);
893 if (EXT4_JOURNAL(inode
))
894 jbd2_journal_release_jbd_inode(EXT4_SB(inode
->i_sb
)->s_journal
,
895 &EXT4_I(inode
)->jinode
);
898 static inline void ext4_show_quota_options(struct seq_file
*seq
,
899 struct super_block
*sb
)
901 #if defined(CONFIG_QUOTA)
902 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
904 if (sbi
->s_jquota_fmt
) {
907 switch (sbi
->s_jquota_fmt
) {
918 seq_printf(seq
, ",jqfmt=%s", fmtname
);
921 if (sbi
->s_qf_names
[USRQUOTA
])
922 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
924 if (sbi
->s_qf_names
[GRPQUOTA
])
925 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
927 if (test_opt(sb
, USRQUOTA
))
928 seq_puts(seq
, ",usrquota");
930 if (test_opt(sb
, GRPQUOTA
))
931 seq_puts(seq
, ",grpquota");
937 * - it's set to a non-default value OR
938 * - if the per-sb default is different from the global default
940 static int ext4_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
943 unsigned long def_mount_opts
;
944 struct super_block
*sb
= vfs
->mnt_sb
;
945 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
946 struct ext4_super_block
*es
= sbi
->s_es
;
948 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
949 def_errors
= le16_to_cpu(es
->s_errors
);
951 if (sbi
->s_sb_block
!= 1)
952 seq_printf(seq
, ",sb=%llu", sbi
->s_sb_block
);
953 if (test_opt(sb
, MINIX_DF
))
954 seq_puts(seq
, ",minixdf");
955 if (test_opt(sb
, GRPID
) && !(def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
956 seq_puts(seq
, ",grpid");
957 if (!test_opt(sb
, GRPID
) && (def_mount_opts
& EXT4_DEFM_BSDGROUPS
))
958 seq_puts(seq
, ",nogrpid");
959 if (sbi
->s_resuid
!= EXT4_DEF_RESUID
||
960 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
) {
961 seq_printf(seq
, ",resuid=%u", sbi
->s_resuid
);
963 if (sbi
->s_resgid
!= EXT4_DEF_RESGID
||
964 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
) {
965 seq_printf(seq
, ",resgid=%u", sbi
->s_resgid
);
967 if (test_opt(sb
, ERRORS_RO
)) {
968 if (def_errors
== EXT4_ERRORS_PANIC
||
969 def_errors
== EXT4_ERRORS_CONTINUE
) {
970 seq_puts(seq
, ",errors=remount-ro");
973 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
974 seq_puts(seq
, ",errors=continue");
975 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
976 seq_puts(seq
, ",errors=panic");
977 if (test_opt(sb
, NO_UID32
) && !(def_mount_opts
& EXT4_DEFM_UID16
))
978 seq_puts(seq
, ",nouid32");
979 if (test_opt(sb
, DEBUG
) && !(def_mount_opts
& EXT4_DEFM_DEBUG
))
980 seq_puts(seq
, ",debug");
981 if (test_opt(sb
, OLDALLOC
))
982 seq_puts(seq
, ",oldalloc");
983 #ifdef CONFIG_EXT4_FS_XATTR
984 if (test_opt(sb
, XATTR_USER
) &&
985 !(def_mount_opts
& EXT4_DEFM_XATTR_USER
))
986 seq_puts(seq
, ",user_xattr");
987 if (!test_opt(sb
, XATTR_USER
) &&
988 (def_mount_opts
& EXT4_DEFM_XATTR_USER
)) {
989 seq_puts(seq
, ",nouser_xattr");
992 #ifdef CONFIG_EXT4_FS_POSIX_ACL
993 if (test_opt(sb
, POSIX_ACL
) && !(def_mount_opts
& EXT4_DEFM_ACL
))
994 seq_puts(seq
, ",acl");
995 if (!test_opt(sb
, POSIX_ACL
) && (def_mount_opts
& EXT4_DEFM_ACL
))
996 seq_puts(seq
, ",noacl");
998 if (sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
) {
999 seq_printf(seq
, ",commit=%u",
1000 (unsigned) (sbi
->s_commit_interval
/ HZ
));
1002 if (sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
) {
1003 seq_printf(seq
, ",min_batch_time=%u",
1004 (unsigned) sbi
->s_min_batch_time
);
1006 if (sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
) {
1007 seq_printf(seq
, ",max_batch_time=%u",
1008 (unsigned) sbi
->s_min_batch_time
);
1012 * We're changing the default of barrier mount option, so
1013 * let's always display its mount state so it's clear what its
1016 seq_puts(seq
, ",barrier=");
1017 seq_puts(seq
, test_opt(sb
, BARRIER
) ? "1" : "0");
1018 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
))
1019 seq_puts(seq
, ",journal_async_commit");
1020 else if (test_opt(sb
, JOURNAL_CHECKSUM
))
1021 seq_puts(seq
, ",journal_checksum");
1022 if (test_opt(sb
, I_VERSION
))
1023 seq_puts(seq
, ",i_version");
1024 if (!test_opt(sb
, DELALLOC
) &&
1025 !(def_mount_opts
& EXT4_DEFM_NODELALLOC
))
1026 seq_puts(seq
, ",nodelalloc");
1029 seq_printf(seq
, ",stripe=%lu", sbi
->s_stripe
);
1031 * journal mode get enabled in different ways
1032 * So just print the value even if we didn't specify it
1034 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
1035 seq_puts(seq
, ",data=journal");
1036 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
1037 seq_puts(seq
, ",data=ordered");
1038 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
1039 seq_puts(seq
, ",data=writeback");
1041 if (sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
1042 seq_printf(seq
, ",inode_readahead_blks=%u",
1043 sbi
->s_inode_readahead_blks
);
1045 if (test_opt(sb
, DATA_ERR_ABORT
))
1046 seq_puts(seq
, ",data_err=abort");
1048 if (test_opt(sb
, NO_AUTO_DA_ALLOC
))
1049 seq_puts(seq
, ",noauto_da_alloc");
1051 if (test_opt(sb
, DISCARD
) && !(def_mount_opts
& EXT4_DEFM_DISCARD
))
1052 seq_puts(seq
, ",discard");
1054 if (test_opt(sb
, NOLOAD
))
1055 seq_puts(seq
, ",norecovery");
1057 if (test_opt(sb
, DIOREAD_NOLOCK
))
1058 seq_puts(seq
, ",dioread_nolock");
1060 if (test_opt(sb
, BLOCK_VALIDITY
) &&
1061 !(def_mount_opts
& EXT4_DEFM_BLOCK_VALIDITY
))
1062 seq_puts(seq
, ",block_validity");
1064 if (!test_opt(sb
, INIT_INODE_TABLE
))
1065 seq_puts(seq
, ",noinit_inode_table");
1066 else if (sbi
->s_li_wait_mult
)
1067 seq_printf(seq
, ",init_inode_table=%u",
1068 (unsigned) sbi
->s_li_wait_mult
);
1070 ext4_show_quota_options(seq
, sb
);
1075 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
1076 u64 ino
, u32 generation
)
1078 struct inode
*inode
;
1080 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
1081 return ERR_PTR(-ESTALE
);
1082 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
1083 return ERR_PTR(-ESTALE
);
1085 /* iget isn't really right if the inode is currently unallocated!!
1087 * ext4_read_inode will return a bad_inode if the inode had been
1088 * deleted, so we should be safe.
1090 * Currently we don't know the generation for parent directory, so
1091 * a generation of 0 means "accept any"
1093 inode
= ext4_iget(sb
, ino
);
1095 return ERR_CAST(inode
);
1096 if (generation
&& inode
->i_generation
!= generation
) {
1098 return ERR_PTR(-ESTALE
);
1104 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
1105 int fh_len
, int fh_type
)
1107 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
1108 ext4_nfs_get_inode
);
1111 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
1112 int fh_len
, int fh_type
)
1114 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
1115 ext4_nfs_get_inode
);
1119 * Try to release metadata pages (indirect blocks, directories) which are
1120 * mapped via the block device. Since these pages could have journal heads
1121 * which would prevent try_to_free_buffers() from freeing them, we must use
1122 * jbd2 layer's try_to_free_buffers() function to release them.
1124 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
1127 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
1129 WARN_ON(PageChecked(page
));
1130 if (!page_has_buffers(page
))
1133 return jbd2_journal_try_to_free_buffers(journal
, page
,
1134 wait
& ~__GFP_WAIT
);
1135 return try_to_free_buffers(page
);
1139 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1140 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1142 static int ext4_write_dquot(struct dquot
*dquot
);
1143 static int ext4_acquire_dquot(struct dquot
*dquot
);
1144 static int ext4_release_dquot(struct dquot
*dquot
);
1145 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1146 static int ext4_write_info(struct super_block
*sb
, int type
);
1147 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1149 static int ext4_quota_off(struct super_block
*sb
, int type
);
1150 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1151 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1152 size_t len
, loff_t off
);
1153 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1154 const char *data
, size_t len
, loff_t off
);
1156 static const struct dquot_operations ext4_quota_operations
= {
1158 .get_reserved_space
= ext4_get_reserved_space
,
1160 .write_dquot
= ext4_write_dquot
,
1161 .acquire_dquot
= ext4_acquire_dquot
,
1162 .release_dquot
= ext4_release_dquot
,
1163 .mark_dirty
= ext4_mark_dquot_dirty
,
1164 .write_info
= ext4_write_info
,
1165 .alloc_dquot
= dquot_alloc
,
1166 .destroy_dquot
= dquot_destroy
,
1169 static const struct quotactl_ops ext4_qctl_operations
= {
1170 .quota_on
= ext4_quota_on
,
1171 .quota_off
= ext4_quota_off
,
1172 .quota_sync
= dquot_quota_sync
,
1173 .get_info
= dquot_get_dqinfo
,
1174 .set_info
= dquot_set_dqinfo
,
1175 .get_dqblk
= dquot_get_dqblk
,
1176 .set_dqblk
= dquot_set_dqblk
1180 static const struct super_operations ext4_sops
= {
1181 .alloc_inode
= ext4_alloc_inode
,
1182 .destroy_inode
= ext4_destroy_inode
,
1183 .write_inode
= ext4_write_inode
,
1184 .dirty_inode
= ext4_dirty_inode
,
1185 .drop_inode
= ext4_drop_inode
,
1186 .evict_inode
= ext4_evict_inode
,
1187 .put_super
= ext4_put_super
,
1188 .sync_fs
= ext4_sync_fs
,
1189 .freeze_fs
= ext4_freeze
,
1190 .unfreeze_fs
= ext4_unfreeze
,
1191 .statfs
= ext4_statfs
,
1192 .remount_fs
= ext4_remount
,
1193 .show_options
= ext4_show_options
,
1195 .quota_read
= ext4_quota_read
,
1196 .quota_write
= ext4_quota_write
,
1198 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1199 .trim_fs
= ext4_trim_fs
1202 static const struct super_operations ext4_nojournal_sops
= {
1203 .alloc_inode
= ext4_alloc_inode
,
1204 .destroy_inode
= ext4_destroy_inode
,
1205 .write_inode
= ext4_write_inode
,
1206 .dirty_inode
= ext4_dirty_inode
,
1207 .drop_inode
= ext4_drop_inode
,
1208 .evict_inode
= ext4_evict_inode
,
1209 .write_super
= ext4_write_super
,
1210 .put_super
= ext4_put_super
,
1211 .statfs
= ext4_statfs
,
1212 .remount_fs
= ext4_remount
,
1213 .show_options
= ext4_show_options
,
1215 .quota_read
= ext4_quota_read
,
1216 .quota_write
= ext4_quota_write
,
1218 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1221 static const struct export_operations ext4_export_ops
= {
1222 .fh_to_dentry
= ext4_fh_to_dentry
,
1223 .fh_to_parent
= ext4_fh_to_parent
,
1224 .get_parent
= ext4_get_parent
,
1228 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1229 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1230 Opt_nouid32
, Opt_debug
, Opt_oldalloc
, Opt_orlov
,
1231 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1232 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
, Opt_nobh
, Opt_bh
,
1233 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
,
1234 Opt_journal_update
, Opt_journal_dev
,
1235 Opt_journal_checksum
, Opt_journal_async_commit
,
1236 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1237 Opt_data_err_abort
, Opt_data_err_ignore
,
1238 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1239 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1240 Opt_noquota
, Opt_ignore
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1241 Opt_resize
, Opt_usrquota
, Opt_grpquota
, Opt_i_version
,
1242 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
,
1243 Opt_block_validity
, Opt_noblock_validity
,
1244 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1245 Opt_dioread_nolock
, Opt_dioread_lock
,
1246 Opt_discard
, Opt_nodiscard
,
1247 Opt_init_inode_table
, Opt_noinit_inode_table
,
1250 static const match_table_t tokens
= {
1251 {Opt_bsd_df
, "bsddf"},
1252 {Opt_minix_df
, "minixdf"},
1253 {Opt_grpid
, "grpid"},
1254 {Opt_grpid
, "bsdgroups"},
1255 {Opt_nogrpid
, "nogrpid"},
1256 {Opt_nogrpid
, "sysvgroups"},
1257 {Opt_resgid
, "resgid=%u"},
1258 {Opt_resuid
, "resuid=%u"},
1260 {Opt_err_cont
, "errors=continue"},
1261 {Opt_err_panic
, "errors=panic"},
1262 {Opt_err_ro
, "errors=remount-ro"},
1263 {Opt_nouid32
, "nouid32"},
1264 {Opt_debug
, "debug"},
1265 {Opt_oldalloc
, "oldalloc"},
1266 {Opt_orlov
, "orlov"},
1267 {Opt_user_xattr
, "user_xattr"},
1268 {Opt_nouser_xattr
, "nouser_xattr"},
1270 {Opt_noacl
, "noacl"},
1271 {Opt_noload
, "noload"},
1272 {Opt_noload
, "norecovery"},
1275 {Opt_commit
, "commit=%u"},
1276 {Opt_min_batch_time
, "min_batch_time=%u"},
1277 {Opt_max_batch_time
, "max_batch_time=%u"},
1278 {Opt_journal_update
, "journal=update"},
1279 {Opt_journal_dev
, "journal_dev=%u"},
1280 {Opt_journal_checksum
, "journal_checksum"},
1281 {Opt_journal_async_commit
, "journal_async_commit"},
1282 {Opt_abort
, "abort"},
1283 {Opt_data_journal
, "data=journal"},
1284 {Opt_data_ordered
, "data=ordered"},
1285 {Opt_data_writeback
, "data=writeback"},
1286 {Opt_data_err_abort
, "data_err=abort"},
1287 {Opt_data_err_ignore
, "data_err=ignore"},
1288 {Opt_offusrjquota
, "usrjquota="},
1289 {Opt_usrjquota
, "usrjquota=%s"},
1290 {Opt_offgrpjquota
, "grpjquota="},
1291 {Opt_grpjquota
, "grpjquota=%s"},
1292 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1293 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1294 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1295 {Opt_grpquota
, "grpquota"},
1296 {Opt_noquota
, "noquota"},
1297 {Opt_quota
, "quota"},
1298 {Opt_usrquota
, "usrquota"},
1299 {Opt_barrier
, "barrier=%u"},
1300 {Opt_barrier
, "barrier"},
1301 {Opt_nobarrier
, "nobarrier"},
1302 {Opt_i_version
, "i_version"},
1303 {Opt_stripe
, "stripe=%u"},
1304 {Opt_resize
, "resize"},
1305 {Opt_delalloc
, "delalloc"},
1306 {Opt_nodelalloc
, "nodelalloc"},
1307 {Opt_block_validity
, "block_validity"},
1308 {Opt_noblock_validity
, "noblock_validity"},
1309 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1310 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1311 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1312 {Opt_auto_da_alloc
, "auto_da_alloc"},
1313 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1314 {Opt_dioread_nolock
, "dioread_nolock"},
1315 {Opt_dioread_lock
, "dioread_lock"},
1316 {Opt_discard
, "discard"},
1317 {Opt_nodiscard
, "nodiscard"},
1318 {Opt_init_inode_table
, "init_itable=%u"},
1319 {Opt_init_inode_table
, "init_itable"},
1320 {Opt_noinit_inode_table
, "noinit_itable"},
1324 static ext4_fsblk_t
get_sb_block(void **data
)
1326 ext4_fsblk_t sb_block
;
1327 char *options
= (char *) *data
;
1329 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1330 return 1; /* Default location */
1333 /* TODO: use simple_strtoll with >32bit ext4 */
1334 sb_block
= simple_strtoul(options
, &options
, 0);
1335 if (*options
&& *options
!= ',') {
1336 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1340 if (*options
== ',')
1342 *data
= (void *) options
;
1347 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1348 static char deprecated_msg
[] = "Mount option \"%s\" will be removed by %s\n"
1349 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1352 static int set_qf_name(struct super_block
*sb
, int qtype
, substring_t
*args
)
1354 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1357 if (sb_any_quota_loaded(sb
) &&
1358 !sbi
->s_qf_names
[qtype
]) {
1359 ext4_msg(sb
, KERN_ERR
,
1360 "Cannot change journaled "
1361 "quota options when quota turned on");
1364 qname
= match_strdup(args
);
1366 ext4_msg(sb
, KERN_ERR
,
1367 "Not enough memory for storing quotafile name");
1370 if (sbi
->s_qf_names
[qtype
] &&
1371 strcmp(sbi
->s_qf_names
[qtype
], qname
)) {
1372 ext4_msg(sb
, KERN_ERR
,
1373 "%s quota file already specified", QTYPE2NAME(qtype
));
1377 sbi
->s_qf_names
[qtype
] = qname
;
1378 if (strchr(sbi
->s_qf_names
[qtype
], '/')) {
1379 ext4_msg(sb
, KERN_ERR
,
1380 "quotafile must be on filesystem root");
1381 kfree(sbi
->s_qf_names
[qtype
]);
1382 sbi
->s_qf_names
[qtype
] = NULL
;
1385 set_opt(sbi
->s_mount_opt
, QUOTA
);
1389 static int clear_qf_name(struct super_block
*sb
, int qtype
)
1392 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1394 if (sb_any_quota_loaded(sb
) &&
1395 sbi
->s_qf_names
[qtype
]) {
1396 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled quota options"
1397 " when quota turned on");
1401 * The space will be released later when all options are confirmed
1404 sbi
->s_qf_names
[qtype
] = NULL
;
1409 static int parse_options(char *options
, struct super_block
*sb
,
1410 unsigned long *journal_devnum
,
1411 unsigned int *journal_ioprio
,
1412 ext4_fsblk_t
*n_blocks_count
, int is_remount
)
1414 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1416 substring_t args
[MAX_OPT_ARGS
];
1426 while ((p
= strsep(&options
, ",")) != NULL
) {
1432 * Initialize args struct so we know whether arg was
1433 * found; some options take optional arguments.
1435 args
[0].to
= args
[0].from
= 0;
1436 token
= match_token(p
, tokens
, args
);
1439 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1440 clear_opt(sbi
->s_mount_opt
, MINIX_DF
);
1443 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1444 set_opt(sbi
->s_mount_opt
, MINIX_DF
);
1448 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1449 set_opt(sbi
->s_mount_opt
, GRPID
);
1453 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, p
, "2.6.38");
1454 clear_opt(sbi
->s_mount_opt
, GRPID
);
1458 if (match_int(&args
[0], &option
))
1460 sbi
->s_resuid
= option
;
1463 if (match_int(&args
[0], &option
))
1465 sbi
->s_resgid
= option
;
1468 /* handled by get_sb_block() instead of here */
1469 /* *sb_block = match_int(&args[0]); */
1472 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1473 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1474 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1477 clear_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1478 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1479 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1482 clear_opt(sbi
->s_mount_opt
, ERRORS_RO
);
1483 clear_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
1484 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
1487 set_opt(sbi
->s_mount_opt
, NO_UID32
);
1490 set_opt(sbi
->s_mount_opt
, DEBUG
);
1493 set_opt(sbi
->s_mount_opt
, OLDALLOC
);
1496 clear_opt(sbi
->s_mount_opt
, OLDALLOC
);
1498 #ifdef CONFIG_EXT4_FS_XATTR
1499 case Opt_user_xattr
:
1500 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
1502 case Opt_nouser_xattr
:
1503 clear_opt(sbi
->s_mount_opt
, XATTR_USER
);
1506 case Opt_user_xattr
:
1507 case Opt_nouser_xattr
:
1508 ext4_msg(sb
, KERN_ERR
, "(no)user_xattr options not supported");
1511 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1513 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1516 clear_opt(sbi
->s_mount_opt
, POSIX_ACL
);
1521 ext4_msg(sb
, KERN_ERR
, "(no)acl options not supported");
1524 case Opt_journal_update
:
1526 /* Eventually we will want to be able to create
1527 a journal file here. For now, only allow the
1528 user to specify an existing inode to be the
1531 ext4_msg(sb
, KERN_ERR
,
1532 "Cannot specify journal on remount");
1535 set_opt(sbi
->s_mount_opt
, UPDATE_JOURNAL
);
1537 case Opt_journal_dev
:
1539 ext4_msg(sb
, KERN_ERR
,
1540 "Cannot specify journal on remount");
1543 if (match_int(&args
[0], &option
))
1545 *journal_devnum
= option
;
1547 case Opt_journal_checksum
:
1548 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1550 case Opt_journal_async_commit
:
1551 set_opt(sbi
->s_mount_opt
, JOURNAL_ASYNC_COMMIT
);
1552 set_opt(sbi
->s_mount_opt
, JOURNAL_CHECKSUM
);
1555 set_opt(sbi
->s_mount_opt
, NOLOAD
);
1558 if (match_int(&args
[0], &option
))
1563 option
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1564 sbi
->s_commit_interval
= HZ
* option
;
1566 case Opt_max_batch_time
:
1567 if (match_int(&args
[0], &option
))
1572 option
= EXT4_DEF_MAX_BATCH_TIME
;
1573 sbi
->s_max_batch_time
= option
;
1575 case Opt_min_batch_time
:
1576 if (match_int(&args
[0], &option
))
1580 sbi
->s_min_batch_time
= option
;
1582 case Opt_data_journal
:
1583 data_opt
= EXT4_MOUNT_JOURNAL_DATA
;
1585 case Opt_data_ordered
:
1586 data_opt
= EXT4_MOUNT_ORDERED_DATA
;
1588 case Opt_data_writeback
:
1589 data_opt
= EXT4_MOUNT_WRITEBACK_DATA
;
1592 if (test_opt(sb
, DATA_FLAGS
) != data_opt
) {
1593 ext4_msg(sb
, KERN_ERR
,
1594 "Cannot change data mode on remount");
1598 clear_opt(sbi
->s_mount_opt
, DATA_FLAGS
);
1599 sbi
->s_mount_opt
|= data_opt
;
1602 case Opt_data_err_abort
:
1603 set_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1605 case Opt_data_err_ignore
:
1606 clear_opt(sbi
->s_mount_opt
, DATA_ERR_ABORT
);
1610 if (!set_qf_name(sb
, USRQUOTA
, &args
[0]))
1614 if (!set_qf_name(sb
, GRPQUOTA
, &args
[0]))
1617 case Opt_offusrjquota
:
1618 if (!clear_qf_name(sb
, USRQUOTA
))
1621 case Opt_offgrpjquota
:
1622 if (!clear_qf_name(sb
, GRPQUOTA
))
1626 case Opt_jqfmt_vfsold
:
1627 qfmt
= QFMT_VFS_OLD
;
1629 case Opt_jqfmt_vfsv0
:
1632 case Opt_jqfmt_vfsv1
:
1635 if (sb_any_quota_loaded(sb
) &&
1636 sbi
->s_jquota_fmt
!= qfmt
) {
1637 ext4_msg(sb
, KERN_ERR
, "Cannot change "
1638 "journaled quota options when "
1642 sbi
->s_jquota_fmt
= qfmt
;
1646 set_opt(sbi
->s_mount_opt
, QUOTA
);
1647 set_opt(sbi
->s_mount_opt
, USRQUOTA
);
1650 set_opt(sbi
->s_mount_opt
, QUOTA
);
1651 set_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1654 if (sb_any_quota_loaded(sb
)) {
1655 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1656 "options when quota turned on");
1659 clear_opt(sbi
->s_mount_opt
, QUOTA
);
1660 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1661 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1667 ext4_msg(sb
, KERN_ERR
,
1668 "quota options not supported");
1672 case Opt_offusrjquota
:
1673 case Opt_offgrpjquota
:
1674 case Opt_jqfmt_vfsold
:
1675 case Opt_jqfmt_vfsv0
:
1676 case Opt_jqfmt_vfsv1
:
1677 ext4_msg(sb
, KERN_ERR
,
1678 "journaled quota options not supported");
1684 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1687 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1691 if (match_int(&args
[0], &option
))
1694 option
= 1; /* No argument, default to 1 */
1696 set_opt(sbi
->s_mount_opt
, BARRIER
);
1698 clear_opt(sbi
->s_mount_opt
, BARRIER
);
1704 ext4_msg(sb
, KERN_ERR
,
1705 "resize option only available "
1709 if (match_int(&args
[0], &option
) != 0)
1711 *n_blocks_count
= option
;
1714 ext4_msg(sb
, KERN_WARNING
,
1715 "Ignoring deprecated nobh option");
1718 ext4_msg(sb
, KERN_WARNING
,
1719 "Ignoring deprecated bh option");
1722 set_opt(sbi
->s_mount_opt
, I_VERSION
);
1723 sb
->s_flags
|= MS_I_VERSION
;
1725 case Opt_nodelalloc
:
1726 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
1729 if (match_int(&args
[0], &option
))
1733 sbi
->s_stripe
= option
;
1736 set_opt(sbi
->s_mount_opt
, DELALLOC
);
1738 case Opt_block_validity
:
1739 set_opt(sbi
->s_mount_opt
, BLOCK_VALIDITY
);
1741 case Opt_noblock_validity
:
1742 clear_opt(sbi
->s_mount_opt
, BLOCK_VALIDITY
);
1744 case Opt_inode_readahead_blks
:
1745 if (match_int(&args
[0], &option
))
1747 if (option
< 0 || option
> (1 << 30))
1749 if (!is_power_of_2(option
)) {
1750 ext4_msg(sb
, KERN_ERR
,
1751 "EXT4-fs: inode_readahead_blks"
1752 " must be a power of 2");
1755 sbi
->s_inode_readahead_blks
= option
;
1757 case Opt_journal_ioprio
:
1758 if (match_int(&args
[0], &option
))
1760 if (option
< 0 || option
> 7)
1762 *journal_ioprio
= IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
,
1765 case Opt_noauto_da_alloc
:
1766 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1768 case Opt_auto_da_alloc
:
1770 if (match_int(&args
[0], &option
))
1773 option
= 1; /* No argument, default to 1 */
1775 clear_opt(sbi
->s_mount_opt
, NO_AUTO_DA_ALLOC
);
1777 set_opt(sbi
->s_mount_opt
,NO_AUTO_DA_ALLOC
);
1780 set_opt(sbi
->s_mount_opt
, DISCARD
);
1783 clear_opt(sbi
->s_mount_opt
, DISCARD
);
1785 case Opt_dioread_nolock
:
1786 set_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
1788 case Opt_dioread_lock
:
1789 clear_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
1791 case Opt_init_inode_table
:
1792 set_opt(sbi
->s_mount_opt
, INIT_INODE_TABLE
);
1794 if (match_int(&args
[0], &option
))
1797 option
= EXT4_DEF_LI_WAIT_MULT
;
1800 sbi
->s_li_wait_mult
= option
;
1802 case Opt_noinit_inode_table
:
1803 clear_opt(sbi
->s_mount_opt
, INIT_INODE_TABLE
);
1806 ext4_msg(sb
, KERN_ERR
,
1807 "Unrecognized mount option \"%s\" "
1808 "or missing value", p
);
1813 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1814 if (test_opt(sb
, USRQUOTA
) && sbi
->s_qf_names
[USRQUOTA
])
1815 clear_opt(sbi
->s_mount_opt
, USRQUOTA
);
1817 if (test_opt(sb
, GRPQUOTA
) && sbi
->s_qf_names
[GRPQUOTA
])
1818 clear_opt(sbi
->s_mount_opt
, GRPQUOTA
);
1820 if (test_opt(sb
, GRPQUOTA
) || test_opt(sb
, USRQUOTA
)) {
1821 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1826 if (!sbi
->s_jquota_fmt
) {
1827 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1832 if (sbi
->s_jquota_fmt
) {
1833 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1834 "specified with no journaling "
1843 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1846 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1849 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1850 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
1851 "forcing read-only mode");
1856 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1857 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
1858 "running e2fsck is recommended");
1859 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1860 ext4_msg(sb
, KERN_WARNING
,
1861 "warning: mounting fs with errors, "
1862 "running e2fsck is recommended");
1863 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) >= 0 &&
1864 le16_to_cpu(es
->s_mnt_count
) >=
1865 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1866 ext4_msg(sb
, KERN_WARNING
,
1867 "warning: maximal mount count reached, "
1868 "running e2fsck is recommended");
1869 else if (le32_to_cpu(es
->s_checkinterval
) &&
1870 (le32_to_cpu(es
->s_lastcheck
) +
1871 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1872 ext4_msg(sb
, KERN_WARNING
,
1873 "warning: checktime reached, "
1874 "running e2fsck is recommended");
1875 if (!sbi
->s_journal
)
1876 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1877 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1878 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1879 le16_add_cpu(&es
->s_mnt_count
, 1);
1880 es
->s_mtime
= cpu_to_le32(get_seconds());
1881 ext4_update_dynamic_rev(sb
);
1883 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1885 ext4_commit_super(sb
, 1);
1886 if (test_opt(sb
, DEBUG
))
1887 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
1888 "bpg=%lu, ipg=%lu, mo=%04x]\n",
1890 sbi
->s_groups_count
,
1891 EXT4_BLOCKS_PER_GROUP(sb
),
1892 EXT4_INODES_PER_GROUP(sb
),
1898 static int ext4_fill_flex_info(struct super_block
*sb
)
1900 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1901 struct ext4_group_desc
*gdp
= NULL
;
1902 ext4_group_t flex_group_count
;
1903 ext4_group_t flex_group
;
1904 int groups_per_flex
= 0;
1908 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1909 groups_per_flex
= 1 << sbi
->s_log_groups_per_flex
;
1911 if (groups_per_flex
< 2) {
1912 sbi
->s_log_groups_per_flex
= 0;
1916 /* We allocate both existing and potentially added groups */
1917 flex_group_count
= ((sbi
->s_groups_count
+ groups_per_flex
- 1) +
1918 ((le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
) + 1) <<
1919 EXT4_DESC_PER_BLOCK_BITS(sb
))) / groups_per_flex
;
1920 size
= flex_group_count
* sizeof(struct flex_groups
);
1921 sbi
->s_flex_groups
= kzalloc(size
, GFP_KERNEL
);
1922 if (sbi
->s_flex_groups
== NULL
) {
1923 sbi
->s_flex_groups
= vmalloc(size
);
1924 if (sbi
->s_flex_groups
)
1925 memset(sbi
->s_flex_groups
, 0, size
);
1927 if (sbi
->s_flex_groups
== NULL
) {
1928 ext4_msg(sb
, KERN_ERR
, "not enough memory for "
1929 "%u flex groups", flex_group_count
);
1933 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1934 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1936 flex_group
= ext4_flex_group(sbi
, i
);
1937 atomic_add(ext4_free_inodes_count(sb
, gdp
),
1938 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
1939 atomic_add(ext4_free_blks_count(sb
, gdp
),
1940 &sbi
->s_flex_groups
[flex_group
].free_blocks
);
1941 atomic_add(ext4_used_dirs_count(sb
, gdp
),
1942 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
1950 __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
1951 struct ext4_group_desc
*gdp
)
1955 if (sbi
->s_es
->s_feature_ro_compat
&
1956 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) {
1957 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
1958 __le32 le_group
= cpu_to_le32(block_group
);
1960 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
1961 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
1962 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
1963 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
1964 /* for checksum of struct ext4_group_desc do the rest...*/
1965 if ((sbi
->s_es
->s_feature_incompat
&
1966 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
1967 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
1968 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
1969 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
1973 return cpu_to_le16(crc
);
1976 int ext4_group_desc_csum_verify(struct ext4_sb_info
*sbi
, __u32 block_group
,
1977 struct ext4_group_desc
*gdp
)
1979 if ((sbi
->s_es
->s_feature_ro_compat
&
1980 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) &&
1981 (gdp
->bg_checksum
!= ext4_group_desc_csum(sbi
, block_group
, gdp
)))
1987 /* Called at mount-time, super-block is locked */
1988 static int ext4_check_descriptors(struct super_block
*sb
,
1989 ext4_group_t
*first_not_zeroed
)
1991 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1992 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
1993 ext4_fsblk_t last_block
;
1994 ext4_fsblk_t block_bitmap
;
1995 ext4_fsblk_t inode_bitmap
;
1996 ext4_fsblk_t inode_table
;
1997 int flexbg_flag
= 0;
1998 ext4_group_t i
, grp
= sbi
->s_groups_count
;
2000 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
2003 ext4_debug("Checking group descriptors");
2005 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
2006 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2008 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
2009 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
2011 last_block
= first_block
+
2012 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2014 if ((grp
== sbi
->s_groups_count
) &&
2015 !(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2018 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
2019 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
2020 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2021 "Block bitmap for group %u not in group "
2022 "(block %llu)!", i
, block_bitmap
);
2025 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
2026 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
2027 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2028 "Inode bitmap for group %u not in group "
2029 "(block %llu)!", i
, inode_bitmap
);
2032 inode_table
= ext4_inode_table(sb
, gdp
);
2033 if (inode_table
< first_block
||
2034 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
2035 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2036 "Inode table for group %u not in group "
2037 "(block %llu)!", i
, inode_table
);
2040 ext4_lock_group(sb
, i
);
2041 if (!ext4_group_desc_csum_verify(sbi
, i
, gdp
)) {
2042 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2043 "Checksum for group %u failed (%u!=%u)",
2044 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
2045 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
2046 if (!(sb
->s_flags
& MS_RDONLY
)) {
2047 ext4_unlock_group(sb
, i
);
2051 ext4_unlock_group(sb
, i
);
2053 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
2055 if (NULL
!= first_not_zeroed
)
2056 *first_not_zeroed
= grp
;
2058 ext4_free_blocks_count_set(sbi
->s_es
, ext4_count_free_blocks(sb
));
2059 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
2063 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2064 * the superblock) which were deleted from all directories, but held open by
2065 * a process at the time of a crash. We walk the list and try to delete these
2066 * inodes at recovery time (only with a read-write filesystem).
2068 * In order to keep the orphan inode chain consistent during traversal (in
2069 * case of crash during recovery), we link each inode into the superblock
2070 * orphan list_head and handle it the same way as an inode deletion during
2071 * normal operation (which journals the operations for us).
2073 * We only do an iget() and an iput() on each inode, which is very safe if we
2074 * accidentally point at an in-use or already deleted inode. The worst that
2075 * can happen in this case is that we get a "bit already cleared" message from
2076 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2077 * e2fsck was run on this filesystem, and it must have already done the orphan
2078 * inode cleanup for us, so we can safely abort without any further action.
2080 static void ext4_orphan_cleanup(struct super_block
*sb
,
2081 struct ext4_super_block
*es
)
2083 unsigned int s_flags
= sb
->s_flags
;
2084 int nr_orphans
= 0, nr_truncates
= 0;
2088 if (!es
->s_last_orphan
) {
2089 jbd_debug(4, "no orphan inodes to clean up\n");
2093 if (bdev_read_only(sb
->s_bdev
)) {
2094 ext4_msg(sb
, KERN_ERR
, "write access "
2095 "unavailable, skipping orphan cleanup");
2099 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2100 if (es
->s_last_orphan
)
2101 jbd_debug(1, "Errors on filesystem, "
2102 "clearing orphan list.\n");
2103 es
->s_last_orphan
= 0;
2104 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2108 if (s_flags
& MS_RDONLY
) {
2109 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
2110 sb
->s_flags
&= ~MS_RDONLY
;
2113 /* Needed for iput() to work correctly and not trash data */
2114 sb
->s_flags
|= MS_ACTIVE
;
2115 /* Turn on quotas so that they are updated correctly */
2116 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2117 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
2118 int ret
= ext4_quota_on_mount(sb
, i
);
2120 ext4_msg(sb
, KERN_ERR
,
2121 "Cannot turn on journaled "
2122 "quota: error %d", ret
);
2127 while (es
->s_last_orphan
) {
2128 struct inode
*inode
;
2130 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
2131 if (IS_ERR(inode
)) {
2132 es
->s_last_orphan
= 0;
2136 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
2137 dquot_initialize(inode
);
2138 if (inode
->i_nlink
) {
2139 ext4_msg(sb
, KERN_DEBUG
,
2140 "%s: truncating inode %lu to %lld bytes",
2141 __func__
, inode
->i_ino
, inode
->i_size
);
2142 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2143 inode
->i_ino
, inode
->i_size
);
2144 ext4_truncate(inode
);
2147 ext4_msg(sb
, KERN_DEBUG
,
2148 "%s: deleting unreferenced inode %lu",
2149 __func__
, inode
->i_ino
);
2150 jbd_debug(2, "deleting unreferenced inode %lu\n",
2154 iput(inode
); /* The delete magic happens here! */
2157 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2160 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
2161 PLURAL(nr_orphans
));
2163 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
2164 PLURAL(nr_truncates
));
2166 /* Turn quotas off */
2167 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2168 if (sb_dqopt(sb
)->files
[i
])
2169 dquot_quota_off(sb
, i
);
2172 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
2176 * Maximal extent format file size.
2177 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2178 * extent format containers, within a sector_t, and within i_blocks
2179 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2180 * so that won't be a limiting factor.
2182 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2184 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
2187 loff_t upper_limit
= MAX_LFS_FILESIZE
;
2189 /* small i_blocks in vfs inode? */
2190 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2192 * CONFIG_LBDAF is not enabled implies the inode
2193 * i_block represent total blocks in 512 bytes
2194 * 32 == size of vfs inode i_blocks * 8
2196 upper_limit
= (1LL << 32) - 1;
2198 /* total blocks in file system block size */
2199 upper_limit
>>= (blkbits
- 9);
2200 upper_limit
<<= blkbits
;
2203 /* 32-bit extent-start container, ee_block */
2208 /* Sanity check against vm- & vfs- imposed limits */
2209 if (res
> upper_limit
)
2216 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2217 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2218 * We need to be 1 filesystem block less than the 2^48 sector limit.
2220 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2222 loff_t res
= EXT4_NDIR_BLOCKS
;
2225 /* This is calculated to be the largest file size for a dense, block
2226 * mapped file such that the file's total number of 512-byte sectors,
2227 * including data and all indirect blocks, does not exceed (2^48 - 1).
2229 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2230 * number of 512-byte sectors of the file.
2233 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2235 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2236 * the inode i_block field represents total file blocks in
2237 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2239 upper_limit
= (1LL << 32) - 1;
2241 /* total blocks in file system block size */
2242 upper_limit
>>= (bits
- 9);
2246 * We use 48 bit ext4_inode i_blocks
2247 * With EXT4_HUGE_FILE_FL set the i_blocks
2248 * represent total number of blocks in
2249 * file system block size
2251 upper_limit
= (1LL << 48) - 1;
2255 /* indirect blocks */
2257 /* double indirect blocks */
2258 meta_blocks
+= 1 + (1LL << (bits
-2));
2259 /* tripple indirect blocks */
2260 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2262 upper_limit
-= meta_blocks
;
2263 upper_limit
<<= bits
;
2265 res
+= 1LL << (bits
-2);
2266 res
+= 1LL << (2*(bits
-2));
2267 res
+= 1LL << (3*(bits
-2));
2269 if (res
> upper_limit
)
2272 if (res
> MAX_LFS_FILESIZE
)
2273 res
= MAX_LFS_FILESIZE
;
2278 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2279 ext4_fsblk_t logical_sb_block
, int nr
)
2281 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2282 ext4_group_t bg
, first_meta_bg
;
2285 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2287 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
2289 return logical_sb_block
+ nr
+ 1;
2290 bg
= sbi
->s_desc_per_block
* nr
;
2291 if (ext4_bg_has_super(sb
, bg
))
2294 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2298 * ext4_get_stripe_size: Get the stripe size.
2299 * @sbi: In memory super block info
2301 * If we have specified it via mount option, then
2302 * use the mount option value. If the value specified at mount time is
2303 * greater than the blocks per group use the super block value.
2304 * If the super block value is greater than blocks per group return 0.
2305 * Allocator needs it be less than blocks per group.
2308 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2310 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2311 unsigned long stripe_width
=
2312 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2314 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2315 return sbi
->s_stripe
;
2317 if (stripe_width
<= sbi
->s_blocks_per_group
)
2318 return stripe_width
;
2320 if (stride
<= sbi
->s_blocks_per_group
)
2329 struct attribute attr
;
2330 ssize_t (*show
)(struct ext4_attr
*, struct ext4_sb_info
*, char *);
2331 ssize_t (*store
)(struct ext4_attr
*, struct ext4_sb_info
*,
2332 const char *, size_t);
2336 static int parse_strtoul(const char *buf
,
2337 unsigned long max
, unsigned long *value
)
2341 *value
= simple_strtoul(skip_spaces(buf
), &endp
, 0);
2342 endp
= skip_spaces(endp
);
2343 if (*endp
|| *value
> max
)
2349 static ssize_t
delayed_allocation_blocks_show(struct ext4_attr
*a
,
2350 struct ext4_sb_info
*sbi
,
2353 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2354 (s64
) percpu_counter_sum(&sbi
->s_dirtyblocks_counter
));
2357 static ssize_t
session_write_kbytes_show(struct ext4_attr
*a
,
2358 struct ext4_sb_info
*sbi
, char *buf
)
2360 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2362 if (!sb
->s_bdev
->bd_part
)
2363 return snprintf(buf
, PAGE_SIZE
, "0\n");
2364 return snprintf(buf
, PAGE_SIZE
, "%lu\n",
2365 (part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2366 sbi
->s_sectors_written_start
) >> 1);
2369 static ssize_t
lifetime_write_kbytes_show(struct ext4_attr
*a
,
2370 struct ext4_sb_info
*sbi
, char *buf
)
2372 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2374 if (!sb
->s_bdev
->bd_part
)
2375 return snprintf(buf
, PAGE_SIZE
, "0\n");
2376 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2377 (unsigned long long)(sbi
->s_kbytes_written
+
2378 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2379 EXT4_SB(sb
)->s_sectors_written_start
) >> 1)));
2382 static ssize_t
inode_readahead_blks_store(struct ext4_attr
*a
,
2383 struct ext4_sb_info
*sbi
,
2384 const char *buf
, size_t count
)
2388 if (parse_strtoul(buf
, 0x40000000, &t
))
2391 if (!is_power_of_2(t
))
2394 sbi
->s_inode_readahead_blks
= t
;
2398 static ssize_t
sbi_ui_show(struct ext4_attr
*a
,
2399 struct ext4_sb_info
*sbi
, char *buf
)
2401 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2403 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
2406 static ssize_t
sbi_ui_store(struct ext4_attr
*a
,
2407 struct ext4_sb_info
*sbi
,
2408 const char *buf
, size_t count
)
2410 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2413 if (parse_strtoul(buf
, 0xffffffff, &t
))
2419 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2420 static struct ext4_attr ext4_attr_##_name = { \
2421 .attr = {.name = __stringify(_name), .mode = _mode }, \
2424 .offset = offsetof(struct ext4_sb_info, _elname), \
2426 #define EXT4_ATTR(name, mode, show, store) \
2427 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2429 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2430 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2431 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2432 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2433 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2434 #define ATTR_LIST(name) &ext4_attr_##name.attr
2436 EXT4_RO_ATTR(delayed_allocation_blocks
);
2437 EXT4_RO_ATTR(session_write_kbytes
);
2438 EXT4_RO_ATTR(lifetime_write_kbytes
);
2439 EXT4_ATTR_OFFSET(inode_readahead_blks
, 0644, sbi_ui_show
,
2440 inode_readahead_blks_store
, s_inode_readahead_blks
);
2441 EXT4_RW_ATTR_SBI_UI(inode_goal
, s_inode_goal
);
2442 EXT4_RW_ATTR_SBI_UI(mb_stats
, s_mb_stats
);
2443 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan
, s_mb_max_to_scan
);
2444 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan
, s_mb_min_to_scan
);
2445 EXT4_RW_ATTR_SBI_UI(mb_order2_req
, s_mb_order2_reqs
);
2446 EXT4_RW_ATTR_SBI_UI(mb_stream_req
, s_mb_stream_request
);
2447 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc
, s_mb_group_prealloc
);
2448 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump
, s_max_writeback_mb_bump
);
2450 static struct attribute
*ext4_attrs
[] = {
2451 ATTR_LIST(delayed_allocation_blocks
),
2452 ATTR_LIST(session_write_kbytes
),
2453 ATTR_LIST(lifetime_write_kbytes
),
2454 ATTR_LIST(inode_readahead_blks
),
2455 ATTR_LIST(inode_goal
),
2456 ATTR_LIST(mb_stats
),
2457 ATTR_LIST(mb_max_to_scan
),
2458 ATTR_LIST(mb_min_to_scan
),
2459 ATTR_LIST(mb_order2_req
),
2460 ATTR_LIST(mb_stream_req
),
2461 ATTR_LIST(mb_group_prealloc
),
2462 ATTR_LIST(max_writeback_mb_bump
),
2466 /* Features this copy of ext4 supports */
2467 EXT4_INFO_ATTR(lazy_itable_init
);
2468 EXT4_INFO_ATTR(batched_discard
);
2470 static struct attribute
*ext4_feat_attrs
[] = {
2471 ATTR_LIST(lazy_itable_init
),
2472 ATTR_LIST(batched_discard
),
2476 static ssize_t
ext4_attr_show(struct kobject
*kobj
,
2477 struct attribute
*attr
, char *buf
)
2479 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2481 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2483 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
2486 static ssize_t
ext4_attr_store(struct kobject
*kobj
,
2487 struct attribute
*attr
,
2488 const char *buf
, size_t len
)
2490 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2492 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2494 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
2497 static void ext4_sb_release(struct kobject
*kobj
)
2499 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2501 complete(&sbi
->s_kobj_unregister
);
2504 static const struct sysfs_ops ext4_attr_ops
= {
2505 .show
= ext4_attr_show
,
2506 .store
= ext4_attr_store
,
2509 static struct kobj_type ext4_ktype
= {
2510 .default_attrs
= ext4_attrs
,
2511 .sysfs_ops
= &ext4_attr_ops
,
2512 .release
= ext4_sb_release
,
2515 static void ext4_feat_release(struct kobject
*kobj
)
2517 complete(&ext4_feat
->f_kobj_unregister
);
2520 static struct kobj_type ext4_feat_ktype
= {
2521 .default_attrs
= ext4_feat_attrs
,
2522 .sysfs_ops
= &ext4_attr_ops
,
2523 .release
= ext4_feat_release
,
2527 * Check whether this filesystem can be mounted based on
2528 * the features present and the RDONLY/RDWR mount requested.
2529 * Returns 1 if this filesystem can be mounted as requested,
2530 * 0 if it cannot be.
2532 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2534 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
)) {
2535 ext4_msg(sb
, KERN_ERR
,
2536 "Couldn't mount because of "
2537 "unsupported optional features (%x)",
2538 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2539 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2546 /* Check that feature set is OK for a read-write mount */
2547 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
)) {
2548 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2549 "unsupported optional features (%x)",
2550 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2551 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2555 * Large file size enabled file system can only be mounted
2556 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2558 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
2559 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2560 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2561 "cannot be mounted RDWR without "
2570 * This function is called once a day if we have errors logged
2571 * on the file system
2573 static void print_daily_error_info(unsigned long arg
)
2575 struct super_block
*sb
= (struct super_block
*) arg
;
2576 struct ext4_sb_info
*sbi
;
2577 struct ext4_super_block
*es
;
2582 if (es
->s_error_count
)
2583 ext4_msg(sb
, KERN_NOTICE
, "error count: %u",
2584 le32_to_cpu(es
->s_error_count
));
2585 if (es
->s_first_error_time
) {
2586 printk(KERN_NOTICE
"EXT4-fs (%s): initial error at %u: %.*s:%d",
2587 sb
->s_id
, le32_to_cpu(es
->s_first_error_time
),
2588 (int) sizeof(es
->s_first_error_func
),
2589 es
->s_first_error_func
,
2590 le32_to_cpu(es
->s_first_error_line
));
2591 if (es
->s_first_error_ino
)
2592 printk(": inode %u",
2593 le32_to_cpu(es
->s_first_error_ino
));
2594 if (es
->s_first_error_block
)
2595 printk(": block %llu", (unsigned long long)
2596 le64_to_cpu(es
->s_first_error_block
));
2599 if (es
->s_last_error_time
) {
2600 printk(KERN_NOTICE
"EXT4-fs (%s): last error at %u: %.*s:%d",
2601 sb
->s_id
, le32_to_cpu(es
->s_last_error_time
),
2602 (int) sizeof(es
->s_last_error_func
),
2603 es
->s_last_error_func
,
2604 le32_to_cpu(es
->s_last_error_line
));
2605 if (es
->s_last_error_ino
)
2606 printk(": inode %u",
2607 le32_to_cpu(es
->s_last_error_ino
));
2608 if (es
->s_last_error_block
)
2609 printk(": block %llu", (unsigned long long)
2610 le64_to_cpu(es
->s_last_error_block
));
2613 mod_timer(&sbi
->s_err_report
, jiffies
+ 24*60*60*HZ
); /* Once a day */
2616 static void ext4_lazyinode_timeout(unsigned long data
)
2618 struct task_struct
*p
= (struct task_struct
*)data
;
2622 /* Find next suitable group and run ext4_init_inode_table */
2623 static int ext4_run_li_request(struct ext4_li_request
*elr
)
2625 struct ext4_group_desc
*gdp
= NULL
;
2626 ext4_group_t group
, ngroups
;
2627 struct super_block
*sb
;
2628 unsigned long timeout
= 0;
2632 ngroups
= EXT4_SB(sb
)->s_groups_count
;
2634 for (group
= elr
->lr_next_group
; group
< ngroups
; group
++) {
2635 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2641 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2645 if (group
== ngroups
)
2650 ret
= ext4_init_inode_table(sb
, group
,
2651 elr
->lr_timeout
? 0 : 1);
2652 if (elr
->lr_timeout
== 0) {
2653 timeout
= jiffies
- timeout
;
2654 if (elr
->lr_sbi
->s_li_wait_mult
)
2655 timeout
*= elr
->lr_sbi
->s_li_wait_mult
;
2658 elr
->lr_timeout
= timeout
;
2660 elr
->lr_next_sched
= jiffies
+ elr
->lr_timeout
;
2661 elr
->lr_next_group
= group
+ 1;
2668 * Remove lr_request from the list_request and free the
2669 * request tructure. Should be called with li_list_mtx held
2671 static void ext4_remove_li_request(struct ext4_li_request
*elr
)
2673 struct ext4_sb_info
*sbi
;
2680 list_del(&elr
->lr_request
);
2681 sbi
->s_li_request
= NULL
;
2685 static void ext4_unregister_li_request(struct super_block
*sb
)
2687 struct ext4_li_request
*elr
= EXT4_SB(sb
)->s_li_request
;
2692 mutex_lock(&ext4_li_info
->li_list_mtx
);
2693 ext4_remove_li_request(elr
);
2694 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2698 * This is the function where ext4lazyinit thread lives. It walks
2699 * through the request list searching for next scheduled filesystem.
2700 * When such a fs is found, run the lazy initialization request
2701 * (ext4_rn_li_request) and keep track of the time spend in this
2702 * function. Based on that time we compute next schedule time of
2703 * the request. When walking through the list is complete, compute
2704 * next waking time and put itself into sleep.
2706 static int ext4_lazyinit_thread(void *arg
)
2708 struct ext4_lazy_init
*eli
= (struct ext4_lazy_init
*)arg
;
2709 struct list_head
*pos
, *n
;
2710 struct ext4_li_request
*elr
;
2711 unsigned long next_wakeup
;
2714 BUG_ON(NULL
== eli
);
2716 eli
->li_timer
.data
= (unsigned long)current
;
2717 eli
->li_timer
.function
= ext4_lazyinode_timeout
;
2719 eli
->li_task
= current
;
2720 wake_up(&eli
->li_wait_task
);
2724 next_wakeup
= MAX_JIFFY_OFFSET
;
2726 mutex_lock(&eli
->li_list_mtx
);
2727 if (list_empty(&eli
->li_request_list
)) {
2728 mutex_unlock(&eli
->li_list_mtx
);
2732 list_for_each_safe(pos
, n
, &eli
->li_request_list
) {
2733 elr
= list_entry(pos
, struct ext4_li_request
,
2736 if (time_after_eq(jiffies
, elr
->lr_next_sched
)) {
2737 if (ext4_run_li_request(elr
) != 0) {
2738 /* error, remove the lazy_init job */
2739 ext4_remove_li_request(elr
);
2744 if (time_before(elr
->lr_next_sched
, next_wakeup
))
2745 next_wakeup
= elr
->lr_next_sched
;
2747 mutex_unlock(&eli
->li_list_mtx
);
2749 if (freezing(current
))
2752 if ((time_after_eq(jiffies
, next_wakeup
)) ||
2753 (MAX_JIFFY_OFFSET
== next_wakeup
)) {
2758 eli
->li_timer
.expires
= next_wakeup
;
2759 add_timer(&eli
->li_timer
);
2760 prepare_to_wait(&eli
->li_wait_daemon
, &wait
,
2761 TASK_INTERRUPTIBLE
);
2762 if (time_before(jiffies
, next_wakeup
))
2764 finish_wait(&eli
->li_wait_daemon
, &wait
);
2769 * It looks like the request list is empty, but we need
2770 * to check it under the li_list_mtx lock, to prevent any
2771 * additions into it, and of course we should lock ext4_li_mtx
2772 * to atomically free the list and ext4_li_info, because at
2773 * this point another ext4 filesystem could be registering
2776 mutex_lock(&ext4_li_mtx
);
2777 mutex_lock(&eli
->li_list_mtx
);
2778 if (!list_empty(&eli
->li_request_list
)) {
2779 mutex_unlock(&eli
->li_list_mtx
);
2780 mutex_unlock(&ext4_li_mtx
);
2783 mutex_unlock(&eli
->li_list_mtx
);
2784 del_timer_sync(&ext4_li_info
->li_timer
);
2785 eli
->li_task
= NULL
;
2786 wake_up(&eli
->li_wait_task
);
2788 kfree(ext4_li_info
);
2789 ext4_li_info
= NULL
;
2790 mutex_unlock(&ext4_li_mtx
);
2795 static void ext4_clear_request_list(void)
2797 struct list_head
*pos
, *n
;
2798 struct ext4_li_request
*elr
;
2800 mutex_lock(&ext4_li_info
->li_list_mtx
);
2801 if (list_empty(&ext4_li_info
->li_request_list
))
2804 list_for_each_safe(pos
, n
, &ext4_li_info
->li_request_list
) {
2805 elr
= list_entry(pos
, struct ext4_li_request
,
2807 ext4_remove_li_request(elr
);
2809 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2812 static int ext4_run_lazyinit_thread(void)
2814 struct task_struct
*t
;
2816 t
= kthread_run(ext4_lazyinit_thread
, ext4_li_info
, "ext4lazyinit");
2818 int err
= PTR_ERR(t
);
2819 ext4_clear_request_list();
2820 del_timer_sync(&ext4_li_info
->li_timer
);
2821 kfree(ext4_li_info
);
2822 ext4_li_info
= NULL
;
2823 printk(KERN_CRIT
"EXT4: error %d creating inode table "
2824 "initialization thread\n",
2828 ext4_li_info
->li_state
|= EXT4_LAZYINIT_RUNNING
;
2830 wait_event(ext4_li_info
->li_wait_task
, ext4_li_info
->li_task
!= NULL
);
2835 * Check whether it make sense to run itable init. thread or not.
2836 * If there is at least one uninitialized inode table, return
2837 * corresponding group number, else the loop goes through all
2838 * groups and return total number of groups.
2840 static ext4_group_t
ext4_has_uninit_itable(struct super_block
*sb
)
2842 ext4_group_t group
, ngroups
= EXT4_SB(sb
)->s_groups_count
;
2843 struct ext4_group_desc
*gdp
= NULL
;
2845 for (group
= 0; group
< ngroups
; group
++) {
2846 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2850 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2857 static int ext4_li_info_new(void)
2859 struct ext4_lazy_init
*eli
= NULL
;
2861 eli
= kzalloc(sizeof(*eli
), GFP_KERNEL
);
2865 eli
->li_task
= NULL
;
2866 INIT_LIST_HEAD(&eli
->li_request_list
);
2867 mutex_init(&eli
->li_list_mtx
);
2869 init_waitqueue_head(&eli
->li_wait_daemon
);
2870 init_waitqueue_head(&eli
->li_wait_task
);
2871 init_timer(&eli
->li_timer
);
2872 eli
->li_state
|= EXT4_LAZYINIT_QUIT
;
2879 static struct ext4_li_request
*ext4_li_request_new(struct super_block
*sb
,
2882 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2883 struct ext4_li_request
*elr
;
2886 elr
= kzalloc(sizeof(*elr
), GFP_KERNEL
);
2892 elr
->lr_next_group
= start
;
2895 * Randomize first schedule time of the request to
2896 * spread the inode table initialization requests
2899 get_random_bytes(&rnd
, sizeof(rnd
));
2900 elr
->lr_next_sched
= jiffies
+ (unsigned long)rnd
%
2901 (EXT4_DEF_LI_MAX_START_DELAY
* HZ
);
2906 static int ext4_register_li_request(struct super_block
*sb
,
2907 ext4_group_t first_not_zeroed
)
2909 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2910 struct ext4_li_request
*elr
;
2911 ext4_group_t ngroups
= EXT4_SB(sb
)->s_groups_count
;
2914 if (sbi
->s_li_request
!= NULL
)
2917 if (first_not_zeroed
== ngroups
||
2918 (sb
->s_flags
& MS_RDONLY
) ||
2919 !test_opt(sb
, INIT_INODE_TABLE
)) {
2920 sbi
->s_li_request
= NULL
;
2924 if (first_not_zeroed
== ngroups
) {
2925 sbi
->s_li_request
= NULL
;
2929 elr
= ext4_li_request_new(sb
, first_not_zeroed
);
2933 mutex_lock(&ext4_li_mtx
);
2935 if (NULL
== ext4_li_info
) {
2936 ret
= ext4_li_info_new();
2941 mutex_lock(&ext4_li_info
->li_list_mtx
);
2942 list_add(&elr
->lr_request
, &ext4_li_info
->li_request_list
);
2943 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2945 sbi
->s_li_request
= elr
;
2947 if (!(ext4_li_info
->li_state
& EXT4_LAZYINIT_RUNNING
)) {
2948 ret
= ext4_run_lazyinit_thread();
2953 mutex_unlock(&ext4_li_mtx
);
2960 * We do not need to lock anything since this is called on
2963 static void ext4_destroy_lazyinit_thread(void)
2966 * If thread exited earlier
2967 * there's nothing to be done.
2972 ext4_clear_request_list();
2974 while (ext4_li_info
->li_task
) {
2975 wake_up(&ext4_li_info
->li_wait_daemon
);
2976 wait_event(ext4_li_info
->li_wait_task
,
2977 ext4_li_info
->li_task
== NULL
);
2981 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
2982 __releases(kernel_lock
)
2983 __acquires(kernel_lock
)
2985 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
2986 struct buffer_head
*bh
;
2987 struct ext4_super_block
*es
= NULL
;
2988 struct ext4_sb_info
*sbi
;
2990 ext4_fsblk_t sb_block
= get_sb_block(&data
);
2991 ext4_fsblk_t logical_sb_block
;
2992 unsigned long offset
= 0;
2993 unsigned long journal_devnum
= 0;
2994 unsigned long def_mount_opts
;
3000 unsigned int db_count
;
3002 int needs_recovery
, has_huge_files
;
3005 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3006 ext4_group_t first_not_zeroed
;
3008 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
3012 sbi
->s_blockgroup_lock
=
3013 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
3014 if (!sbi
->s_blockgroup_lock
) {
3018 sb
->s_fs_info
= sbi
;
3019 sbi
->s_mount_opt
= 0;
3020 sbi
->s_resuid
= EXT4_DEF_RESUID
;
3021 sbi
->s_resgid
= EXT4_DEF_RESGID
;
3022 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
3023 sbi
->s_sb_block
= sb_block
;
3024 if (sb
->s_bdev
->bd_part
)
3025 sbi
->s_sectors_written_start
=
3026 part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]);
3028 /* Cleanup superblock name */
3029 for (cp
= sb
->s_id
; (cp
= strchr(cp
, '/'));)
3033 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
3035 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
3040 * The ext4 superblock will not be buffer aligned for other than 1kB
3041 * block sizes. We need to calculate the offset from buffer start.
3043 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
3044 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3045 offset
= do_div(logical_sb_block
, blocksize
);
3047 logical_sb_block
= sb_block
;
3050 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
3051 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
3055 * Note: s_es must be initialized as soon as possible because
3056 * some ext4 macro-instructions depend on its value
3058 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
3060 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
3061 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
3063 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
3065 /* Set defaults before we parse the mount options */
3066 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
3067 set_opt(sbi
->s_mount_opt
, INIT_INODE_TABLE
);
3068 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
3069 set_opt(sbi
->s_mount_opt
, DEBUG
);
3070 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
) {
3071 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, "bsdgroups",
3073 set_opt(sbi
->s_mount_opt
, GRPID
);
3075 if (def_mount_opts
& EXT4_DEFM_UID16
)
3076 set_opt(sbi
->s_mount_opt
, NO_UID32
);
3077 #ifdef CONFIG_EXT4_FS_XATTR
3078 if (def_mount_opts
& EXT4_DEFM_XATTR_USER
)
3079 set_opt(sbi
->s_mount_opt
, XATTR_USER
);
3081 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3082 if (def_mount_opts
& EXT4_DEFM_ACL
)
3083 set_opt(sbi
->s_mount_opt
, POSIX_ACL
);
3085 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
3086 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
3087 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
3088 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
3089 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
3090 set_opt(sbi
->s_mount_opt
, WRITEBACK_DATA
);
3092 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
3093 set_opt(sbi
->s_mount_opt
, ERRORS_PANIC
);
3094 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
3095 set_opt(sbi
->s_mount_opt
, ERRORS_CONT
);
3097 set_opt(sbi
->s_mount_opt
, ERRORS_RO
);
3098 if (def_mount_opts
& EXT4_DEFM_BLOCK_VALIDITY
)
3099 set_opt(sbi
->s_mount_opt
, BLOCK_VALIDITY
);
3100 if (def_mount_opts
& EXT4_DEFM_DISCARD
)
3101 set_opt(sbi
->s_mount_opt
, DISCARD
);
3103 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
3104 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
3105 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
3106 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
3107 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
3109 if ((def_mount_opts
& EXT4_DEFM_NOBARRIER
) == 0)
3110 set_opt(sbi
->s_mount_opt
, BARRIER
);
3113 * enable delayed allocation by default
3114 * Use -o nodelalloc to turn it off
3116 if (!IS_EXT3_SB(sb
) &&
3117 ((def_mount_opts
& EXT4_DEFM_NODELALLOC
) == 0))
3118 set_opt(sbi
->s_mount_opt
, DELALLOC
);
3120 if (!parse_options((char *) sbi
->s_es
->s_mount_opts
, sb
,
3121 &journal_devnum
, &journal_ioprio
, NULL
, 0)) {
3122 ext4_msg(sb
, KERN_WARNING
,
3123 "failed to parse options in superblock: %s",
3124 sbi
->s_es
->s_mount_opts
);
3126 if (!parse_options((char *) data
, sb
, &journal_devnum
,
3127 &journal_ioprio
, NULL
, 0))
3130 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3131 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
3133 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
3134 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
3135 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
3136 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
3137 ext4_msg(sb
, KERN_WARNING
,
3138 "feature flags set on rev 0 fs, "
3139 "running e2fsck is recommended");
3142 * Check feature flags regardless of the revision level, since we
3143 * previously didn't change the revision level when setting the flags,
3144 * so there is a chance incompat flags are set on a rev 0 filesystem.
3146 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
3149 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
3151 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
3152 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
3153 ext4_msg(sb
, KERN_ERR
,
3154 "Unsupported filesystem blocksize %d", blocksize
);
3158 if (sb
->s_blocksize
!= blocksize
) {
3159 /* Validate the filesystem blocksize */
3160 if (!sb_set_blocksize(sb
, blocksize
)) {
3161 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
3167 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3168 offset
= do_div(logical_sb_block
, blocksize
);
3169 bh
= sb_bread(sb
, logical_sb_block
);
3171 ext4_msg(sb
, KERN_ERR
,
3172 "Can't read superblock on 2nd try");
3175 es
= (struct ext4_super_block
*)(((char *)bh
->b_data
) + offset
);
3177 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
3178 ext4_msg(sb
, KERN_ERR
,
3179 "Magic mismatch, very weird!");
3184 has_huge_files
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3185 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
);
3186 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
3188 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
3190 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
3191 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
3192 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
3194 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
3195 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
3196 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
3197 (!is_power_of_2(sbi
->s_inode_size
)) ||
3198 (sbi
->s_inode_size
> blocksize
)) {
3199 ext4_msg(sb
, KERN_ERR
,
3200 "unsupported inode size: %d",
3204 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
3205 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
3208 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
3209 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
3210 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
3211 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
3212 !is_power_of_2(sbi
->s_desc_size
)) {
3213 ext4_msg(sb
, KERN_ERR
,
3214 "unsupported descriptor size %lu",
3219 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
3221 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
3222 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
3223 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
3226 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
3227 if (sbi
->s_inodes_per_block
== 0)
3229 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
3230 sbi
->s_inodes_per_block
;
3231 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
3233 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3234 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
3235 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
3237 for (i
= 0; i
< 4; i
++)
3238 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
3239 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
3240 i
= le32_to_cpu(es
->s_flags
);
3241 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
3242 sbi
->s_hash_unsigned
= 3;
3243 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
3244 #ifdef __CHAR_UNSIGNED__
3245 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
3246 sbi
->s_hash_unsigned
= 3;
3248 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
3253 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
3254 ext4_msg(sb
, KERN_ERR
,
3255 "#blocks per group too big: %lu",
3256 sbi
->s_blocks_per_group
);
3259 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
3260 ext4_msg(sb
, KERN_ERR
,
3261 "#inodes per group too big: %lu",
3262 sbi
->s_inodes_per_group
);
3267 * Test whether we have more sectors than will fit in sector_t,
3268 * and whether the max offset is addressable by the page cache.
3270 ret
= generic_check_addressable(sb
->s_blocksize_bits
,
3271 ext4_blocks_count(es
));
3273 ext4_msg(sb
, KERN_ERR
, "filesystem"
3274 " too large to mount safely on this system");
3275 if (sizeof(sector_t
) < 8)
3276 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
3280 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
3283 /* check blocks count against device size */
3284 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
3285 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
3286 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
3287 "exceeds size of device (%llu blocks)",
3288 ext4_blocks_count(es
), blocks_count
);
3293 * It makes no sense for the first data block to be beyond the end
3294 * of the filesystem.
3296 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
3297 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data"
3298 "block %u is beyond end of filesystem (%llu)",
3299 le32_to_cpu(es
->s_first_data_block
),
3300 ext4_blocks_count(es
));
3303 blocks_count
= (ext4_blocks_count(es
) -
3304 le32_to_cpu(es
->s_first_data_block
) +
3305 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
3306 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
3307 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
3308 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
3309 "(block count %llu, first data block %u, "
3310 "blocks per group %lu)", sbi
->s_groups_count
,
3311 ext4_blocks_count(es
),
3312 le32_to_cpu(es
->s_first_data_block
),
3313 EXT4_BLOCKS_PER_GROUP(sb
));
3316 sbi
->s_groups_count
= blocks_count
;
3317 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
3318 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
3319 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
3320 EXT4_DESC_PER_BLOCK(sb
);
3321 sbi
->s_group_desc
= kmalloc(db_count
* sizeof(struct buffer_head
*),
3323 if (sbi
->s_group_desc
== NULL
) {
3324 ext4_msg(sb
, KERN_ERR
, "not enough memory");
3328 #ifdef CONFIG_PROC_FS
3330 sbi
->s_proc
= proc_mkdir(sb
->s_id
, ext4_proc_root
);
3333 bgl_lock_init(sbi
->s_blockgroup_lock
);
3335 for (i
= 0; i
< db_count
; i
++) {
3336 block
= descriptor_loc(sb
, logical_sb_block
, i
);
3337 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
3338 if (!sbi
->s_group_desc
[i
]) {
3339 ext4_msg(sb
, KERN_ERR
,
3340 "can't read group descriptor %d", i
);
3345 if (!ext4_check_descriptors(sb
, &first_not_zeroed
)) {
3346 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
3349 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
3350 if (!ext4_fill_flex_info(sb
)) {
3351 ext4_msg(sb
, KERN_ERR
,
3352 "unable to initialize "
3353 "flex_bg meta info!");
3357 sbi
->s_gdb_count
= db_count
;
3358 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
3359 spin_lock_init(&sbi
->s_next_gen_lock
);
3361 err
= percpu_counter_init(&sbi
->s_freeblocks_counter
,
3362 ext4_count_free_blocks(sb
));
3364 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
3365 ext4_count_free_inodes(sb
));
3368 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
3369 ext4_count_dirs(sb
));
3372 err
= percpu_counter_init(&sbi
->s_dirtyblocks_counter
, 0);
3375 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
3379 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
3380 sbi
->s_max_writeback_mb_bump
= 128;
3383 * set up enough so that it can read an inode
3385 if (!test_opt(sb
, NOLOAD
) &&
3386 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
3387 sb
->s_op
= &ext4_sops
;
3389 sb
->s_op
= &ext4_nojournal_sops
;
3390 sb
->s_export_op
= &ext4_export_ops
;
3391 sb
->s_xattr
= ext4_xattr_handlers
;
3393 sb
->s_qcop
= &ext4_qctl_operations
;
3394 sb
->dq_op
= &ext4_quota_operations
;
3396 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
3397 mutex_init(&sbi
->s_orphan_lock
);
3398 mutex_init(&sbi
->s_resize_lock
);
3402 needs_recovery
= (es
->s_last_orphan
!= 0 ||
3403 EXT4_HAS_INCOMPAT_FEATURE(sb
,
3404 EXT4_FEATURE_INCOMPAT_RECOVER
));
3407 * The first inode we look at is the journal inode. Don't try
3408 * root first: it may be modified in the journal!
3410 if (!test_opt(sb
, NOLOAD
) &&
3411 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
3412 if (ext4_load_journal(sb
, es
, journal_devnum
))
3414 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
3415 EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3416 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
3417 "suppressed and not mounted read-only");
3418 goto failed_mount_wq
;
3420 clear_opt(sbi
->s_mount_opt
, DATA_FLAGS
);
3421 set_opt(sbi
->s_mount_opt
, WRITEBACK_DATA
);
3422 sbi
->s_journal
= NULL
;
3427 if (ext4_blocks_count(es
) > 0xffffffffULL
&&
3428 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
3429 JBD2_FEATURE_INCOMPAT_64BIT
)) {
3430 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
3431 goto failed_mount_wq
;
3434 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
3435 jbd2_journal_set_features(sbi
->s_journal
,
3436 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
3437 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3438 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
3439 jbd2_journal_set_features(sbi
->s_journal
,
3440 JBD2_FEATURE_COMPAT_CHECKSUM
, 0, 0);
3441 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3442 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3444 jbd2_journal_clear_features(sbi
->s_journal
,
3445 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
3446 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3449 /* We have now updated the journal if required, so we can
3450 * validate the data journaling mode. */
3451 switch (test_opt(sb
, DATA_FLAGS
)) {
3453 /* No mode set, assume a default based on the journal
3454 * capabilities: ORDERED_DATA if the journal can
3455 * cope, else JOURNAL_DATA
3457 if (jbd2_journal_check_available_features
3458 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
3459 set_opt(sbi
->s_mount_opt
, ORDERED_DATA
);
3461 set_opt(sbi
->s_mount_opt
, JOURNAL_DATA
);
3464 case EXT4_MOUNT_ORDERED_DATA
:
3465 case EXT4_MOUNT_WRITEBACK_DATA
:
3466 if (!jbd2_journal_check_available_features
3467 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
3468 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
3469 "requested data journaling mode");
3470 goto failed_mount_wq
;
3475 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
3478 * The journal may have updated the bg summary counts, so we
3479 * need to update the global counters.
3481 percpu_counter_set(&sbi
->s_freeblocks_counter
,
3482 ext4_count_free_blocks(sb
));
3483 percpu_counter_set(&sbi
->s_freeinodes_counter
,
3484 ext4_count_free_inodes(sb
));
3485 percpu_counter_set(&sbi
->s_dirs_counter
,
3486 ext4_count_dirs(sb
));
3487 percpu_counter_set(&sbi
->s_dirtyblocks_counter
, 0);
3490 EXT4_SB(sb
)->dio_unwritten_wq
= create_workqueue("ext4-dio-unwritten");
3491 if (!EXT4_SB(sb
)->dio_unwritten_wq
) {
3492 printk(KERN_ERR
"EXT4-fs: failed to create DIO workqueue\n");
3493 goto failed_mount_wq
;
3497 * The jbd2_journal_load will have done any necessary log recovery,
3498 * so we can safely mount the rest of the filesystem now.
3501 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
3503 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
3504 ret
= PTR_ERR(root
);
3507 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
3509 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
3512 sb
->s_root
= d_alloc_root(root
);
3514 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
3520 ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
);
3522 /* determine the minimum size of new large inodes, if present */
3523 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
3524 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
3525 EXT4_GOOD_OLD_INODE_SIZE
;
3526 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3527 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
3528 if (sbi
->s_want_extra_isize
<
3529 le16_to_cpu(es
->s_want_extra_isize
))
3530 sbi
->s_want_extra_isize
=
3531 le16_to_cpu(es
->s_want_extra_isize
);
3532 if (sbi
->s_want_extra_isize
<
3533 le16_to_cpu(es
->s_min_extra_isize
))
3534 sbi
->s_want_extra_isize
=
3535 le16_to_cpu(es
->s_min_extra_isize
);
3538 /* Check if enough inode space is available */
3539 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
3540 sbi
->s_inode_size
) {
3541 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
3542 EXT4_GOOD_OLD_INODE_SIZE
;
3543 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
3547 if (test_opt(sb
, DELALLOC
) &&
3548 (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)) {
3549 ext4_msg(sb
, KERN_WARNING
, "Ignoring delalloc option - "
3550 "requested data journaling mode");
3551 clear_opt(sbi
->s_mount_opt
, DELALLOC
);
3553 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
3554 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
3555 ext4_msg(sb
, KERN_WARNING
, "Ignoring dioread_nolock "
3556 "option - requested data journaling mode");
3557 clear_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
3559 if (sb
->s_blocksize
< PAGE_SIZE
) {
3560 ext4_msg(sb
, KERN_WARNING
, "Ignoring dioread_nolock "
3561 "option - block size is too small");
3562 clear_opt(sbi
->s_mount_opt
, DIOREAD_NOLOCK
);
3566 err
= ext4_setup_system_zone(sb
);
3568 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
3574 err
= ext4_mb_init(sb
, needs_recovery
);
3576 ext4_msg(sb
, KERN_ERR
, "failed to initialize mballoc (%d)",
3581 err
= ext4_register_li_request(sb
, first_not_zeroed
);
3585 sbi
->s_kobj
.kset
= ext4_kset
;
3586 init_completion(&sbi
->s_kobj_unregister
);
3587 err
= kobject_init_and_add(&sbi
->s_kobj
, &ext4_ktype
, NULL
,
3590 ext4_mb_release(sb
);
3591 ext4_ext_release(sb
);
3595 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
3596 ext4_orphan_cleanup(sb
, es
);
3597 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
3598 if (needs_recovery
) {
3599 ext4_msg(sb
, KERN_INFO
, "recovery complete");
3600 ext4_mark_recovery_complete(sb
, es
);
3602 if (EXT4_SB(sb
)->s_journal
) {
3603 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
3604 descr
= " journalled data mode";
3605 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
3606 descr
= " ordered data mode";
3608 descr
= " writeback data mode";
3610 descr
= "out journal";
3612 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s. "
3613 "Opts: %s%s%s", descr
, sbi
->s_es
->s_mount_opts
,
3614 *sbi
->s_es
->s_mount_opts
? "; " : "", orig_data
);
3616 init_timer(&sbi
->s_err_report
);
3617 sbi
->s_err_report
.function
= print_daily_error_info
;
3618 sbi
->s_err_report
.data
= (unsigned long) sb
;
3619 if (es
->s_error_count
)
3620 mod_timer(&sbi
->s_err_report
, jiffies
+ 300*HZ
); /* 5 minutes */
3627 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
3631 ext4_msg(sb
, KERN_ERR
, "mount failed");
3632 destroy_workqueue(EXT4_SB(sb
)->dio_unwritten_wq
);
3634 ext4_release_system_zone(sb
);
3635 if (sbi
->s_journal
) {
3636 jbd2_journal_destroy(sbi
->s_journal
);
3637 sbi
->s_journal
= NULL
;
3640 if (sbi
->s_flex_groups
) {
3641 if (is_vmalloc_addr(sbi
->s_flex_groups
))
3642 vfree(sbi
->s_flex_groups
);
3644 kfree(sbi
->s_flex_groups
);
3646 percpu_counter_destroy(&sbi
->s_freeblocks_counter
);
3647 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
3648 percpu_counter_destroy(&sbi
->s_dirs_counter
);
3649 percpu_counter_destroy(&sbi
->s_dirtyblocks_counter
);
3651 for (i
= 0; i
< db_count
; i
++)
3652 brelse(sbi
->s_group_desc
[i
]);
3653 kfree(sbi
->s_group_desc
);
3656 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
3659 for (i
= 0; i
< MAXQUOTAS
; i
++)
3660 kfree(sbi
->s_qf_names
[i
]);
3662 ext4_blkdev_remove(sbi
);
3665 sb
->s_fs_info
= NULL
;
3666 kfree(sbi
->s_blockgroup_lock
);
3674 * Setup any per-fs journal parameters now. We'll do this both on
3675 * initial mount, once the journal has been initialised but before we've
3676 * done any recovery; and again on any subsequent remount.
3678 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
3680 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3682 journal
->j_commit_interval
= sbi
->s_commit_interval
;
3683 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
3684 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
3686 write_lock(&journal
->j_state_lock
);
3687 if (test_opt(sb
, BARRIER
))
3688 journal
->j_flags
|= JBD2_BARRIER
;
3690 journal
->j_flags
&= ~JBD2_BARRIER
;
3691 if (test_opt(sb
, DATA_ERR_ABORT
))
3692 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
3694 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
3695 write_unlock(&journal
->j_state_lock
);
3698 static journal_t
*ext4_get_journal(struct super_block
*sb
,
3699 unsigned int journal_inum
)
3701 struct inode
*journal_inode
;
3704 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3706 /* First, test for the existence of a valid inode on disk. Bad
3707 * things happen if we iget() an unused inode, as the subsequent
3708 * iput() will try to delete it. */
3710 journal_inode
= ext4_iget(sb
, journal_inum
);
3711 if (IS_ERR(journal_inode
)) {
3712 ext4_msg(sb
, KERN_ERR
, "no journal found");
3715 if (!journal_inode
->i_nlink
) {
3716 make_bad_inode(journal_inode
);
3717 iput(journal_inode
);
3718 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
3722 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3723 journal_inode
, journal_inode
->i_size
);
3724 if (!S_ISREG(journal_inode
->i_mode
)) {
3725 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
3726 iput(journal_inode
);
3730 journal
= jbd2_journal_init_inode(journal_inode
);
3732 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
3733 iput(journal_inode
);
3736 journal
->j_private
= sb
;
3737 ext4_init_journal_params(sb
, journal
);
3741 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
3744 struct buffer_head
*bh
;
3748 int hblock
, blocksize
;
3749 ext4_fsblk_t sb_block
;
3750 unsigned long offset
;
3751 struct ext4_super_block
*es
;
3752 struct block_device
*bdev
;
3754 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3756 bdev
= ext4_blkdev_get(j_dev
, sb
);
3760 blocksize
= sb
->s_blocksize
;
3761 hblock
= bdev_logical_block_size(bdev
);
3762 if (blocksize
< hblock
) {
3763 ext4_msg(sb
, KERN_ERR
,
3764 "blocksize too small for journal device");
3768 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
3769 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
3770 set_blocksize(bdev
, blocksize
);
3771 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
3772 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
3773 "external journal");
3777 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
3778 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
3779 !(le32_to_cpu(es
->s_feature_incompat
) &
3780 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
3781 ext4_msg(sb
, KERN_ERR
, "external journal has "
3787 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
3788 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
3793 len
= ext4_blocks_count(es
);
3794 start
= sb_block
+ 1;
3795 brelse(bh
); /* we're done with the superblock */
3797 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
3798 start
, len
, blocksize
);
3800 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
3803 journal
->j_private
= sb
;
3804 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
3805 wait_on_buffer(journal
->j_sb_buffer
);
3806 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
3807 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
3810 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
3811 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
3812 "user (unsupported) - %d",
3813 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
3816 EXT4_SB(sb
)->journal_bdev
= bdev
;
3817 ext4_init_journal_params(sb
, journal
);
3821 jbd2_journal_destroy(journal
);
3823 ext4_blkdev_put(bdev
);
3827 static int ext4_load_journal(struct super_block
*sb
,
3828 struct ext4_super_block
*es
,
3829 unsigned long journal_devnum
)
3832 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
3835 int really_read_only
;
3837 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3839 if (journal_devnum
&&
3840 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3841 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
3842 "numbers have changed");
3843 journal_dev
= new_decode_dev(journal_devnum
);
3845 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
3847 really_read_only
= bdev_read_only(sb
->s_bdev
);
3850 * Are we loading a blank journal or performing recovery after a
3851 * crash? For recovery, we need to check in advance whether we
3852 * can get read-write access to the device.
3854 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3855 if (sb
->s_flags
& MS_RDONLY
) {
3856 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
3857 "required on readonly filesystem");
3858 if (really_read_only
) {
3859 ext4_msg(sb
, KERN_ERR
, "write access "
3860 "unavailable, cannot proceed");
3863 ext4_msg(sb
, KERN_INFO
, "write access will "
3864 "be enabled during recovery");
3868 if (journal_inum
&& journal_dev
) {
3869 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
3870 "and inode journals!");
3875 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
3878 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
3882 if (!(journal
->j_flags
& JBD2_BARRIER
))
3883 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
3885 if (!really_read_only
&& test_opt(sb
, UPDATE_JOURNAL
)) {
3886 err
= jbd2_journal_update_format(journal
);
3888 ext4_msg(sb
, KERN_ERR
, "error updating journal");
3889 jbd2_journal_destroy(journal
);
3894 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
3895 err
= jbd2_journal_wipe(journal
, !really_read_only
);
3897 char *save
= kmalloc(EXT4_S_ERR_LEN
, GFP_KERNEL
);
3899 memcpy(save
, ((char *) es
) +
3900 EXT4_S_ERR_START
, EXT4_S_ERR_LEN
);
3901 err
= jbd2_journal_load(journal
);
3903 memcpy(((char *) es
) + EXT4_S_ERR_START
,
3904 save
, EXT4_S_ERR_LEN
);
3909 ext4_msg(sb
, KERN_ERR
, "error loading journal");
3910 jbd2_journal_destroy(journal
);
3914 EXT4_SB(sb
)->s_journal
= journal
;
3915 ext4_clear_journal_err(sb
, es
);
3917 if (!really_read_only
&& journal_devnum
&&
3918 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3919 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
3921 /* Make sure we flush the recovery flag to disk. */
3922 ext4_commit_super(sb
, 1);
3928 static int ext4_commit_super(struct super_block
*sb
, int sync
)
3930 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
3931 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
3936 if (buffer_write_io_error(sbh
)) {
3938 * Oh, dear. A previous attempt to write the
3939 * superblock failed. This could happen because the
3940 * USB device was yanked out. Or it could happen to
3941 * be a transient write error and maybe the block will
3942 * be remapped. Nothing we can do but to retry the
3943 * write and hope for the best.
3945 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
3946 "superblock detected");
3947 clear_buffer_write_io_error(sbh
);
3948 set_buffer_uptodate(sbh
);
3951 * If the file system is mounted read-only, don't update the
3952 * superblock write time. This avoids updating the superblock
3953 * write time when we are mounting the root file system
3954 * read/only but we need to replay the journal; at that point,
3955 * for people who are east of GMT and who make their clock
3956 * tick in localtime for Windows bug-for-bug compatibility,
3957 * the clock is set in the future, and this will cause e2fsck
3958 * to complain and force a full file system check.
3960 if (!(sb
->s_flags
& MS_RDONLY
))
3961 es
->s_wtime
= cpu_to_le32(get_seconds());
3962 if (sb
->s_bdev
->bd_part
)
3963 es
->s_kbytes_written
=
3964 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
3965 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
3966 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
3968 es
->s_kbytes_written
=
3969 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
);
3970 ext4_free_blocks_count_set(es
, percpu_counter_sum_positive(
3971 &EXT4_SB(sb
)->s_freeblocks_counter
));
3972 es
->s_free_inodes_count
=
3973 cpu_to_le32(percpu_counter_sum_positive(
3974 &EXT4_SB(sb
)->s_freeinodes_counter
));
3976 BUFFER_TRACE(sbh
, "marking dirty");
3977 mark_buffer_dirty(sbh
);
3979 error
= sync_dirty_buffer(sbh
);
3983 error
= buffer_write_io_error(sbh
);
3985 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
3987 clear_buffer_write_io_error(sbh
);
3988 set_buffer_uptodate(sbh
);
3995 * Have we just finished recovery? If so, and if we are mounting (or
3996 * remounting) the filesystem readonly, then we will end up with a
3997 * consistent fs on disk. Record that fact.
3999 static void ext4_mark_recovery_complete(struct super_block
*sb
,
4000 struct ext4_super_block
*es
)
4002 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
4004 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
4005 BUG_ON(journal
!= NULL
);
4008 jbd2_journal_lock_updates(journal
);
4009 if (jbd2_journal_flush(journal
) < 0)
4012 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
4013 sb
->s_flags
& MS_RDONLY
) {
4014 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4015 ext4_commit_super(sb
, 1);
4019 jbd2_journal_unlock_updates(journal
);
4023 * If we are mounting (or read-write remounting) a filesystem whose journal
4024 * has recorded an error from a previous lifetime, move that error to the
4025 * main filesystem now.
4027 static void ext4_clear_journal_err(struct super_block
*sb
,
4028 struct ext4_super_block
*es
)
4034 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4036 journal
= EXT4_SB(sb
)->s_journal
;
4039 * Now check for any error status which may have been recorded in the
4040 * journal by a prior ext4_error() or ext4_abort()
4043 j_errno
= jbd2_journal_errno(journal
);
4047 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
4048 ext4_warning(sb
, "Filesystem error recorded "
4049 "from previous mount: %s", errstr
);
4050 ext4_warning(sb
, "Marking fs in need of filesystem check.");
4052 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
4053 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
4054 ext4_commit_super(sb
, 1);
4056 jbd2_journal_clear_err(journal
);
4061 * Force the running and committing transactions to commit,
4062 * and wait on the commit.
4064 int ext4_force_commit(struct super_block
*sb
)
4069 if (sb
->s_flags
& MS_RDONLY
)
4072 journal
= EXT4_SB(sb
)->s_journal
;
4074 vfs_check_frozen(sb
, SB_FREEZE_TRANS
);
4075 ret
= ext4_journal_force_commit(journal
);
4081 static void ext4_write_super(struct super_block
*sb
)
4084 ext4_commit_super(sb
, 1);
4088 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
4092 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4094 trace_ext4_sync_fs(sb
, wait
);
4095 flush_workqueue(sbi
->dio_unwritten_wq
);
4096 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
4098 jbd2_log_wait_commit(sbi
->s_journal
, target
);
4104 * LVM calls this function before a (read-only) snapshot is created. This
4105 * gives us a chance to flush the journal completely and mark the fs clean.
4107 static int ext4_freeze(struct super_block
*sb
)
4112 if (sb
->s_flags
& MS_RDONLY
)
4115 journal
= EXT4_SB(sb
)->s_journal
;
4117 /* Now we set up the journal barrier. */
4118 jbd2_journal_lock_updates(journal
);
4121 * Don't clear the needs_recovery flag if we failed to flush
4124 error
= jbd2_journal_flush(journal
);
4128 /* Journal blocked and flushed, clear needs_recovery flag. */
4129 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4130 error
= ext4_commit_super(sb
, 1);
4132 /* we rely on s_frozen to stop further updates */
4133 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
4138 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4139 * flag here, even though the filesystem is not technically dirty yet.
4141 static int ext4_unfreeze(struct super_block
*sb
)
4143 if (sb
->s_flags
& MS_RDONLY
)
4147 /* Reset the needs_recovery flag before the fs is unlocked. */
4148 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4149 ext4_commit_super(sb
, 1);
4154 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
4156 struct ext4_super_block
*es
;
4157 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4158 ext4_fsblk_t n_blocks_count
= 0;
4159 unsigned long old_sb_flags
;
4160 struct ext4_mount_options old_opts
;
4161 int enable_quota
= 0;
4163 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
4168 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
4170 /* Store the original options */
4172 old_sb_flags
= sb
->s_flags
;
4173 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
4174 old_opts
.s_resuid
= sbi
->s_resuid
;
4175 old_opts
.s_resgid
= sbi
->s_resgid
;
4176 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
4177 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
4178 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
4180 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
4181 for (i
= 0; i
< MAXQUOTAS
; i
++)
4182 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
4184 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
4185 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
4188 * Allow the "check" option to be passed as a remount option.
4190 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
,
4191 &n_blocks_count
, 1)) {
4196 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
4197 ext4_abort(sb
, "Abort forced by user");
4199 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
4200 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
4204 if (sbi
->s_journal
) {
4205 ext4_init_journal_params(sb
, sbi
->s_journal
);
4206 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
4209 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
) ||
4210 n_blocks_count
> ext4_blocks_count(es
)) {
4211 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
4216 if (*flags
& MS_RDONLY
) {
4217 err
= dquot_suspend(sb
, -1);
4222 * First of all, the unconditional stuff we have to do
4223 * to disable replay of the journal when we next remount
4225 sb
->s_flags
|= MS_RDONLY
;
4228 * OK, test if we are remounting a valid rw partition
4229 * readonly, and if so set the rdonly flag and then
4230 * mark the partition as valid again.
4232 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
4233 (sbi
->s_mount_state
& EXT4_VALID_FS
))
4234 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
4237 ext4_mark_recovery_complete(sb
, es
);
4239 /* Make sure we can mount this feature set readwrite */
4240 if (!ext4_feature_set_ok(sb
, 0)) {
4245 * Make sure the group descriptor checksums
4246 * are sane. If they aren't, refuse to remount r/w.
4248 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
4249 struct ext4_group_desc
*gdp
=
4250 ext4_get_group_desc(sb
, g
, NULL
);
4252 if (!ext4_group_desc_csum_verify(sbi
, g
, gdp
)) {
4253 ext4_msg(sb
, KERN_ERR
,
4254 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4255 g
, le16_to_cpu(ext4_group_desc_csum(sbi
, g
, gdp
)),
4256 le16_to_cpu(gdp
->bg_checksum
));
4263 * If we have an unprocessed orphan list hanging
4264 * around from a previously readonly bdev mount,
4265 * require a full umount/remount for now.
4267 if (es
->s_last_orphan
) {
4268 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
4269 "remount RDWR because of unprocessed "
4270 "orphan inode list. Please "
4271 "umount/remount instead");
4277 * Mounting a RDONLY partition read-write, so reread
4278 * and store the current valid flag. (It may have
4279 * been changed by e2fsck since we originally mounted
4283 ext4_clear_journal_err(sb
, es
);
4284 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
4285 if ((err
= ext4_group_extend(sb
, es
, n_blocks_count
)))
4287 if (!ext4_setup_super(sb
, es
, 0))
4288 sb
->s_flags
&= ~MS_RDONLY
;
4294 * Reinitialize lazy itable initialization thread based on
4297 if ((sb
->s_flags
& MS_RDONLY
) || !test_opt(sb
, INIT_INODE_TABLE
))
4298 ext4_unregister_li_request(sb
);
4300 ext4_group_t first_not_zeroed
;
4301 first_not_zeroed
= ext4_has_uninit_itable(sb
);
4302 ext4_register_li_request(sb
, first_not_zeroed
);
4305 ext4_setup_system_zone(sb
);
4306 if (sbi
->s_journal
== NULL
)
4307 ext4_commit_super(sb
, 1);
4310 /* Release old quota file names */
4311 for (i
= 0; i
< MAXQUOTAS
; i
++)
4312 if (old_opts
.s_qf_names
[i
] &&
4313 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
4314 kfree(old_opts
.s_qf_names
[i
]);
4318 dquot_resume(sb
, -1);
4320 ext4_msg(sb
, KERN_INFO
, "re-mounted. Opts: %s", orig_data
);
4325 sb
->s_flags
= old_sb_flags
;
4326 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
4327 sbi
->s_resuid
= old_opts
.s_resuid
;
4328 sbi
->s_resgid
= old_opts
.s_resgid
;
4329 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
4330 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
4331 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
4333 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
4334 for (i
= 0; i
< MAXQUOTAS
; i
++) {
4335 if (sbi
->s_qf_names
[i
] &&
4336 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
4337 kfree(sbi
->s_qf_names
[i
]);
4338 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
4346 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
4348 struct super_block
*sb
= dentry
->d_sb
;
4349 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4350 struct ext4_super_block
*es
= sbi
->s_es
;
4353 if (test_opt(sb
, MINIX_DF
)) {
4354 sbi
->s_overhead_last
= 0;
4355 } else if (sbi
->s_blocks_last
!= ext4_blocks_count(es
)) {
4356 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
4357 ext4_fsblk_t overhead
= 0;
4360 * Compute the overhead (FS structures). This is constant
4361 * for a given filesystem unless the number of block groups
4362 * changes so we cache the previous value until it does.
4366 * All of the blocks before first_data_block are
4369 overhead
= le32_to_cpu(es
->s_first_data_block
);
4372 * Add the overhead attributed to the superblock and
4373 * block group descriptors. If the sparse superblocks
4374 * feature is turned on, then not all groups have this.
4376 for (i
= 0; i
< ngroups
; i
++) {
4377 overhead
+= ext4_bg_has_super(sb
, i
) +
4378 ext4_bg_num_gdb(sb
, i
);
4383 * Every block group has an inode bitmap, a block
4384 * bitmap, and an inode table.
4386 overhead
+= ngroups
* (2 + sbi
->s_itb_per_group
);
4387 sbi
->s_overhead_last
= overhead
;
4389 sbi
->s_blocks_last
= ext4_blocks_count(es
);
4392 buf
->f_type
= EXT4_SUPER_MAGIC
;
4393 buf
->f_bsize
= sb
->s_blocksize
;
4394 buf
->f_blocks
= ext4_blocks_count(es
) - sbi
->s_overhead_last
;
4395 buf
->f_bfree
= percpu_counter_sum_positive(&sbi
->s_freeblocks_counter
) -
4396 percpu_counter_sum_positive(&sbi
->s_dirtyblocks_counter
);
4397 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
4398 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
4400 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
4401 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
4402 buf
->f_namelen
= EXT4_NAME_LEN
;
4403 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
4404 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
4405 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
4406 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
4411 /* Helper function for writing quotas on sync - we need to start transaction
4412 * before quota file is locked for write. Otherwise the are possible deadlocks:
4413 * Process 1 Process 2
4414 * ext4_create() quota_sync()
4415 * jbd2_journal_start() write_dquot()
4416 * dquot_initialize() down(dqio_mutex)
4417 * down(dqio_mutex) jbd2_journal_start()
4423 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
4425 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_type
];
4428 static int ext4_write_dquot(struct dquot
*dquot
)
4432 struct inode
*inode
;
4434 inode
= dquot_to_inode(dquot
);
4435 handle
= ext4_journal_start(inode
,
4436 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
4438 return PTR_ERR(handle
);
4439 ret
= dquot_commit(dquot
);
4440 err
= ext4_journal_stop(handle
);
4446 static int ext4_acquire_dquot(struct dquot
*dquot
)
4451 handle
= ext4_journal_start(dquot_to_inode(dquot
),
4452 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
4454 return PTR_ERR(handle
);
4455 ret
= dquot_acquire(dquot
);
4456 err
= ext4_journal_stop(handle
);
4462 static int ext4_release_dquot(struct dquot
*dquot
)
4467 handle
= ext4_journal_start(dquot_to_inode(dquot
),
4468 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
4469 if (IS_ERR(handle
)) {
4470 /* Release dquot anyway to avoid endless cycle in dqput() */
4471 dquot_release(dquot
);
4472 return PTR_ERR(handle
);
4474 ret
= dquot_release(dquot
);
4475 err
= ext4_journal_stop(handle
);
4481 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
4483 /* Are we journaling quotas? */
4484 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
4485 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
4486 dquot_mark_dquot_dirty(dquot
);
4487 return ext4_write_dquot(dquot
);
4489 return dquot_mark_dquot_dirty(dquot
);
4493 static int ext4_write_info(struct super_block
*sb
, int type
)
4498 /* Data block + inode block */
4499 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
4501 return PTR_ERR(handle
);
4502 ret
= dquot_commit_info(sb
, type
);
4503 err
= ext4_journal_stop(handle
);
4510 * Turn on quotas during mount time - we need to find
4511 * the quota file and such...
4513 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
4515 return dquot_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
4516 EXT4_SB(sb
)->s_jquota_fmt
, type
);
4520 * Standard function to be called on quota_on
4522 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
4528 if (!test_opt(sb
, QUOTA
))
4531 err
= kern_path(name
, LOOKUP_FOLLOW
, &path
);
4535 /* Quotafile not on the same filesystem? */
4536 if (path
.mnt
->mnt_sb
!= sb
) {
4540 /* Journaling quota? */
4541 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
4542 /* Quotafile not in fs root? */
4543 if (path
.dentry
->d_parent
!= sb
->s_root
)
4544 ext4_msg(sb
, KERN_WARNING
,
4545 "Quota file not on filesystem root. "
4546 "Journaled quota will not work");
4550 * When we journal data on quota file, we have to flush journal to see
4551 * all updates to the file when we bypass pagecache...
4553 if (EXT4_SB(sb
)->s_journal
&&
4554 ext4_should_journal_data(path
.dentry
->d_inode
)) {
4556 * We don't need to lock updates but journal_flush() could
4557 * otherwise be livelocked...
4559 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
4560 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
4561 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
4568 err
= dquot_quota_on_path(sb
, type
, format_id
, &path
);
4573 static int ext4_quota_off(struct super_block
*sb
, int type
)
4575 /* Force all delayed allocation blocks to be allocated.
4576 * Caller already holds s_umount sem */
4577 if (test_opt(sb
, DELALLOC
))
4578 sync_filesystem(sb
);
4580 return dquot_quota_off(sb
, type
);
4583 /* Read data from quotafile - avoid pagecache and such because we cannot afford
4584 * acquiring the locks... As quota files are never truncated and quota code
4585 * itself serializes the operations (and noone else should touch the files)
4586 * we don't have to be afraid of races */
4587 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
4588 size_t len
, loff_t off
)
4590 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
4591 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
4593 int offset
= off
& (sb
->s_blocksize
- 1);
4596 struct buffer_head
*bh
;
4597 loff_t i_size
= i_size_read(inode
);
4601 if (off
+len
> i_size
)
4604 while (toread
> 0) {
4605 tocopy
= sb
->s_blocksize
- offset
< toread
?
4606 sb
->s_blocksize
- offset
: toread
;
4607 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
4610 if (!bh
) /* A hole? */
4611 memset(data
, 0, tocopy
);
4613 memcpy(data
, bh
->b_data
+offset
, tocopy
);
4623 /* Write to quotafile (we know the transaction is already started and has
4624 * enough credits) */
4625 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
4626 const char *data
, size_t len
, loff_t off
)
4628 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
4629 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
4631 int offset
= off
& (sb
->s_blocksize
- 1);
4632 struct buffer_head
*bh
;
4633 handle_t
*handle
= journal_current_handle();
4635 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
4636 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
4637 " cancelled because transaction is not started",
4638 (unsigned long long)off
, (unsigned long long)len
);
4642 * Since we account only one data block in transaction credits,
4643 * then it is impossible to cross a block boundary.
4645 if (sb
->s_blocksize
- offset
< len
) {
4646 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
4647 " cancelled because not block aligned",
4648 (unsigned long long)off
, (unsigned long long)len
);
4652 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
4653 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
4656 err
= ext4_journal_get_write_access(handle
, bh
);
4662 memcpy(bh
->b_data
+offset
, data
, len
);
4663 flush_dcache_page(bh
->b_page
);
4665 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
4669 mutex_unlock(&inode
->i_mutex
);
4672 if (inode
->i_size
< off
+ len
) {
4673 i_size_write(inode
, off
+ len
);
4674 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
4676 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
4677 ext4_mark_inode_dirty(handle
, inode
);
4678 mutex_unlock(&inode
->i_mutex
);
4684 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
4685 const char *dev_name
, void *data
)
4687 return mount_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
);
4690 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4691 static struct file_system_type ext2_fs_type
= {
4692 .owner
= THIS_MODULE
,
4694 .mount
= ext4_mount
,
4695 .kill_sb
= kill_block_super
,
4696 .fs_flags
= FS_REQUIRES_DEV
,
4699 static inline void register_as_ext2(void)
4701 int err
= register_filesystem(&ext2_fs_type
);
4704 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
4707 static inline void unregister_as_ext2(void)
4709 unregister_filesystem(&ext2_fs_type
);
4711 MODULE_ALIAS("ext2");
4713 static inline void register_as_ext2(void) { }
4714 static inline void unregister_as_ext2(void) { }
4717 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4718 static inline void register_as_ext3(void)
4720 int err
= register_filesystem(&ext3_fs_type
);
4723 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
4726 static inline void unregister_as_ext3(void)
4728 unregister_filesystem(&ext3_fs_type
);
4730 MODULE_ALIAS("ext3");
4732 static inline void register_as_ext3(void) { }
4733 static inline void unregister_as_ext3(void) { }
4736 static struct file_system_type ext4_fs_type
= {
4737 .owner
= THIS_MODULE
,
4739 .mount
= ext4_mount
,
4740 .kill_sb
= kill_block_super
,
4741 .fs_flags
= FS_REQUIRES_DEV
,
4744 int __init
ext4_init_feat_adverts(void)
4746 struct ext4_features
*ef
;
4749 ef
= kzalloc(sizeof(struct ext4_features
), GFP_KERNEL
);
4753 ef
->f_kobj
.kset
= ext4_kset
;
4754 init_completion(&ef
->f_kobj_unregister
);
4755 ret
= kobject_init_and_add(&ef
->f_kobj
, &ext4_feat_ktype
, NULL
,
4768 static int __init
ext4_init_fs(void)
4772 ext4_check_flag_values();
4773 err
= ext4_init_pageio();
4776 err
= ext4_init_system_zone();
4779 ext4_kset
= kset_create_and_add("ext4", NULL
, fs_kobj
);
4782 ext4_proc_root
= proc_mkdir("fs/ext4", NULL
);
4784 err
= ext4_init_feat_adverts();
4786 err
= ext4_init_mballoc();
4790 err
= ext4_init_xattr();
4793 err
= init_inodecache();
4798 err
= register_filesystem(&ext4_fs_type
);
4802 ext4_li_info
= NULL
;
4803 mutex_init(&ext4_li_mtx
);
4806 unregister_as_ext2();
4807 unregister_as_ext3();
4808 destroy_inodecache();
4812 ext4_exit_mballoc();
4815 remove_proc_entry("fs/ext4", NULL
);
4816 kset_unregister(ext4_kset
);
4818 ext4_exit_system_zone();
4824 static void __exit
ext4_exit_fs(void)
4826 ext4_destroy_lazyinit_thread();
4827 unregister_as_ext2();
4828 unregister_as_ext3();
4829 unregister_filesystem(&ext4_fs_type
);
4830 destroy_inodecache();
4832 ext4_exit_mballoc();
4833 remove_proc_entry("fs/ext4", NULL
);
4834 kset_unregister(ext4_kset
);
4835 ext4_exit_system_zone();
4839 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4840 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4841 MODULE_LICENSE("GPL");
4842 module_init(ext4_init_fs
)
4843 module_exit(ext4_exit_fs
)