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 <linux/cleancache.h>
42 #include <asm/uaccess.h>
44 #include <linux/kthread.h>
45 #include <linux/freezer.h>
48 #include "ext4_extents.h"
49 #include "ext4_jbd2.h"
54 #define CREATE_TRACE_POINTS
55 #include <trace/events/ext4.h>
57 static struct proc_dir_entry
*ext4_proc_root
;
58 static struct kset
*ext4_kset
;
59 static struct ext4_lazy_init
*ext4_li_info
;
60 static struct mutex ext4_li_mtx
;
61 static struct ext4_features
*ext4_feat
;
63 static int ext4_load_journal(struct super_block
*, struct ext4_super_block
*,
64 unsigned long journal_devnum
);
65 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
);
66 static int ext4_commit_super(struct super_block
*sb
, int sync
);
67 static void ext4_mark_recovery_complete(struct super_block
*sb
,
68 struct ext4_super_block
*es
);
69 static void ext4_clear_journal_err(struct super_block
*sb
,
70 struct ext4_super_block
*es
);
71 static int ext4_sync_fs(struct super_block
*sb
, int wait
);
72 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
74 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
);
75 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
);
76 static int ext4_unfreeze(struct super_block
*sb
);
77 static int ext4_freeze(struct super_block
*sb
);
78 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
79 const char *dev_name
, void *data
);
80 static inline int ext2_feature_set_ok(struct super_block
*sb
);
81 static inline int ext3_feature_set_ok(struct super_block
*sb
);
82 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
);
83 static void ext4_destroy_lazyinit_thread(void);
84 static void ext4_unregister_li_request(struct super_block
*sb
);
85 static void ext4_clear_request_list(void);
87 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
88 static struct file_system_type ext2_fs_type
= {
92 .kill_sb
= kill_block_super
,
93 .fs_flags
= FS_REQUIRES_DEV
,
95 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
97 #define IS_EXT2_SB(sb) (0)
101 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
102 static struct file_system_type ext3_fs_type
= {
103 .owner
= THIS_MODULE
,
106 .kill_sb
= kill_block_super
,
107 .fs_flags
= FS_REQUIRES_DEV
,
109 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
111 #define IS_EXT3_SB(sb) (0)
114 static int ext4_verify_csum_type(struct super_block
*sb
,
115 struct ext4_super_block
*es
)
117 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
,
118 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))
121 return es
->s_checksum_type
== EXT4_CRC32C_CHKSUM
;
124 static __le32
ext4_superblock_csum(struct super_block
*sb
,
125 struct ext4_super_block
*es
)
127 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
128 int offset
= offsetof(struct ext4_super_block
, s_checksum
);
131 csum
= ext4_chksum(sbi
, ~0, (char *)es
, offset
);
133 return cpu_to_le32(csum
);
136 int ext4_superblock_csum_verify(struct super_block
*sb
,
137 struct ext4_super_block
*es
)
139 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
,
140 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))
143 return es
->s_checksum
== ext4_superblock_csum(sb
, es
);
146 void ext4_superblock_csum_set(struct super_block
*sb
,
147 struct ext4_super_block
*es
)
149 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
,
150 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))
153 es
->s_checksum
= ext4_superblock_csum(sb
, es
);
156 void *ext4_kvmalloc(size_t size
, gfp_t flags
)
160 ret
= kmalloc(size
, flags
);
162 ret
= __vmalloc(size
, flags
, PAGE_KERNEL
);
166 void *ext4_kvzalloc(size_t size
, gfp_t flags
)
170 ret
= kzalloc(size
, flags
);
172 ret
= __vmalloc(size
, flags
| __GFP_ZERO
, PAGE_KERNEL
);
176 void ext4_kvfree(void *ptr
)
178 if (is_vmalloc_addr(ptr
))
185 ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
186 struct ext4_group_desc
*bg
)
188 return le32_to_cpu(bg
->bg_block_bitmap_lo
) |
189 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
190 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
193 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
194 struct ext4_group_desc
*bg
)
196 return le32_to_cpu(bg
->bg_inode_bitmap_lo
) |
197 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
198 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
201 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
202 struct ext4_group_desc
*bg
)
204 return le32_to_cpu(bg
->bg_inode_table_lo
) |
205 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
206 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
209 __u32
ext4_free_group_clusters(struct super_block
*sb
,
210 struct ext4_group_desc
*bg
)
212 return le16_to_cpu(bg
->bg_free_blocks_count_lo
) |
213 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
214 (__u32
)le16_to_cpu(bg
->bg_free_blocks_count_hi
) << 16 : 0);
217 __u32
ext4_free_inodes_count(struct super_block
*sb
,
218 struct ext4_group_desc
*bg
)
220 return le16_to_cpu(bg
->bg_free_inodes_count_lo
) |
221 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
222 (__u32
)le16_to_cpu(bg
->bg_free_inodes_count_hi
) << 16 : 0);
225 __u32
ext4_used_dirs_count(struct super_block
*sb
,
226 struct ext4_group_desc
*bg
)
228 return le16_to_cpu(bg
->bg_used_dirs_count_lo
) |
229 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
230 (__u32
)le16_to_cpu(bg
->bg_used_dirs_count_hi
) << 16 : 0);
233 __u32
ext4_itable_unused_count(struct super_block
*sb
,
234 struct ext4_group_desc
*bg
)
236 return le16_to_cpu(bg
->bg_itable_unused_lo
) |
237 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
238 (__u32
)le16_to_cpu(bg
->bg_itable_unused_hi
) << 16 : 0);
241 void ext4_block_bitmap_set(struct super_block
*sb
,
242 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
244 bg
->bg_block_bitmap_lo
= cpu_to_le32((u32
)blk
);
245 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
246 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
249 void ext4_inode_bitmap_set(struct super_block
*sb
,
250 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
252 bg
->bg_inode_bitmap_lo
= cpu_to_le32((u32
)blk
);
253 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
254 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
257 void ext4_inode_table_set(struct super_block
*sb
,
258 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
260 bg
->bg_inode_table_lo
= cpu_to_le32((u32
)blk
);
261 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
262 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
265 void ext4_free_group_clusters_set(struct super_block
*sb
,
266 struct ext4_group_desc
*bg
, __u32 count
)
268 bg
->bg_free_blocks_count_lo
= cpu_to_le16((__u16
)count
);
269 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
270 bg
->bg_free_blocks_count_hi
= cpu_to_le16(count
>> 16);
273 void ext4_free_inodes_set(struct super_block
*sb
,
274 struct ext4_group_desc
*bg
, __u32 count
)
276 bg
->bg_free_inodes_count_lo
= cpu_to_le16((__u16
)count
);
277 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
278 bg
->bg_free_inodes_count_hi
= cpu_to_le16(count
>> 16);
281 void ext4_used_dirs_set(struct super_block
*sb
,
282 struct ext4_group_desc
*bg
, __u32 count
)
284 bg
->bg_used_dirs_count_lo
= cpu_to_le16((__u16
)count
);
285 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
286 bg
->bg_used_dirs_count_hi
= cpu_to_le16(count
>> 16);
289 void ext4_itable_unused_set(struct super_block
*sb
,
290 struct ext4_group_desc
*bg
, __u32 count
)
292 bg
->bg_itable_unused_lo
= cpu_to_le16((__u16
)count
);
293 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
294 bg
->bg_itable_unused_hi
= cpu_to_le16(count
>> 16);
298 /* Just increment the non-pointer handle value */
299 static handle_t
*ext4_get_nojournal(void)
301 handle_t
*handle
= current
->journal_info
;
302 unsigned long ref_cnt
= (unsigned long)handle
;
304 BUG_ON(ref_cnt
>= EXT4_NOJOURNAL_MAX_REF_COUNT
);
307 handle
= (handle_t
*)ref_cnt
;
309 current
->journal_info
= handle
;
314 /* Decrement the non-pointer handle value */
315 static void ext4_put_nojournal(handle_t
*handle
)
317 unsigned long ref_cnt
= (unsigned long)handle
;
319 BUG_ON(ref_cnt
== 0);
322 handle
= (handle_t
*)ref_cnt
;
324 current
->journal_info
= handle
;
328 * Wrappers for jbd2_journal_start/end.
330 * The only special thing we need to do here is to make sure that all
331 * journal_end calls result in the superblock being marked dirty, so
332 * that sync() will call the filesystem's write_super callback if
335 handle_t
*ext4_journal_start_sb(struct super_block
*sb
, int nblocks
)
339 trace_ext4_journal_start(sb
, nblocks
, _RET_IP_
);
340 if (sb
->s_flags
& MS_RDONLY
)
341 return ERR_PTR(-EROFS
);
343 WARN_ON(sb
->s_writers
.frozen
== SB_FREEZE_COMPLETE
);
344 journal
= EXT4_SB(sb
)->s_journal
;
346 return ext4_get_nojournal();
348 * Special case here: if the journal has aborted behind our
349 * backs (eg. EIO in the commit thread), then we still need to
350 * take the FS itself readonly cleanly.
352 if (is_journal_aborted(journal
)) {
353 ext4_abort(sb
, "Detected aborted journal");
354 return ERR_PTR(-EROFS
);
356 return jbd2_journal_start(journal
, nblocks
);
360 * The only special thing we need to do here is to make sure that all
361 * jbd2_journal_stop calls result in the superblock being marked dirty, so
362 * that sync() will call the filesystem's write_super callback if
365 int __ext4_journal_stop(const char *where
, unsigned int line
, handle_t
*handle
)
367 struct super_block
*sb
;
371 if (!ext4_handle_valid(handle
)) {
372 ext4_put_nojournal(handle
);
375 sb
= handle
->h_transaction
->t_journal
->j_private
;
377 rc
= jbd2_journal_stop(handle
);
382 __ext4_std_error(sb
, where
, line
, err
);
386 void ext4_journal_abort_handle(const char *caller
, unsigned int line
,
387 const char *err_fn
, struct buffer_head
*bh
,
388 handle_t
*handle
, int err
)
391 const char *errstr
= ext4_decode_error(NULL
, err
, nbuf
);
393 BUG_ON(!ext4_handle_valid(handle
));
396 BUFFER_TRACE(bh
, "abort");
401 if (is_handle_aborted(handle
))
404 printk(KERN_ERR
"EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
405 caller
, line
, errstr
, err_fn
);
407 jbd2_journal_abort_handle(handle
);
410 static void __save_error_info(struct super_block
*sb
, const char *func
,
413 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
415 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
416 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
417 es
->s_last_error_time
= cpu_to_le32(get_seconds());
418 strncpy(es
->s_last_error_func
, func
, sizeof(es
->s_last_error_func
));
419 es
->s_last_error_line
= cpu_to_le32(line
);
420 if (!es
->s_first_error_time
) {
421 es
->s_first_error_time
= es
->s_last_error_time
;
422 strncpy(es
->s_first_error_func
, func
,
423 sizeof(es
->s_first_error_func
));
424 es
->s_first_error_line
= cpu_to_le32(line
);
425 es
->s_first_error_ino
= es
->s_last_error_ino
;
426 es
->s_first_error_block
= es
->s_last_error_block
;
429 * Start the daily error reporting function if it hasn't been
432 if (!es
->s_error_count
)
433 mod_timer(&EXT4_SB(sb
)->s_err_report
, jiffies
+ 24*60*60*HZ
);
434 es
->s_error_count
= cpu_to_le32(le32_to_cpu(es
->s_error_count
) + 1);
437 static void save_error_info(struct super_block
*sb
, const char *func
,
440 __save_error_info(sb
, func
, line
);
441 ext4_commit_super(sb
, 1);
445 * The del_gendisk() function uninitializes the disk-specific data
446 * structures, including the bdi structure, without telling anyone
447 * else. Once this happens, any attempt to call mark_buffer_dirty()
448 * (for example, by ext4_commit_super), will cause a kernel OOPS.
449 * This is a kludge to prevent these oops until we can put in a proper
450 * hook in del_gendisk() to inform the VFS and file system layers.
452 static int block_device_ejected(struct super_block
*sb
)
454 struct inode
*bd_inode
= sb
->s_bdev
->bd_inode
;
455 struct backing_dev_info
*bdi
= bd_inode
->i_mapping
->backing_dev_info
;
457 return bdi
->dev
== NULL
;
460 static void ext4_journal_commit_callback(journal_t
*journal
, transaction_t
*txn
)
462 struct super_block
*sb
= journal
->j_private
;
463 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
464 int error
= is_journal_aborted(journal
);
465 struct ext4_journal_cb_entry
*jce
, *tmp
;
467 spin_lock(&sbi
->s_md_lock
);
468 list_for_each_entry_safe(jce
, tmp
, &txn
->t_private_list
, jce_list
) {
469 list_del_init(&jce
->jce_list
);
470 spin_unlock(&sbi
->s_md_lock
);
471 jce
->jce_func(sb
, jce
, error
);
472 spin_lock(&sbi
->s_md_lock
);
474 spin_unlock(&sbi
->s_md_lock
);
477 /* Deal with the reporting of failure conditions on a filesystem such as
478 * inconsistencies detected or read IO failures.
480 * On ext2, we can store the error state of the filesystem in the
481 * superblock. That is not possible on ext4, because we may have other
482 * write ordering constraints on the superblock which prevent us from
483 * writing it out straight away; and given that the journal is about to
484 * be aborted, we can't rely on the current, or future, transactions to
485 * write out the superblock safely.
487 * We'll just use the jbd2_journal_abort() error code to record an error in
488 * the journal instead. On recovery, the journal will complain about
489 * that error until we've noted it down and cleared it.
492 static void ext4_handle_error(struct super_block
*sb
)
494 if (sb
->s_flags
& MS_RDONLY
)
497 if (!test_opt(sb
, ERRORS_CONT
)) {
498 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
500 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
502 jbd2_journal_abort(journal
, -EIO
);
504 if (test_opt(sb
, ERRORS_RO
)) {
505 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
506 sb
->s_flags
|= MS_RDONLY
;
508 if (test_opt(sb
, ERRORS_PANIC
))
509 panic("EXT4-fs (device %s): panic forced after error\n",
513 void __ext4_error(struct super_block
*sb
, const char *function
,
514 unsigned int line
, const char *fmt
, ...)
516 struct va_format vaf
;
522 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
523 sb
->s_id
, function
, line
, current
->comm
, &vaf
);
525 save_error_info(sb
, function
, line
);
527 ext4_handle_error(sb
);
530 void ext4_error_inode(struct inode
*inode
, const char *function
,
531 unsigned int line
, ext4_fsblk_t block
,
532 const char *fmt
, ...)
535 struct va_format vaf
;
536 struct ext4_super_block
*es
= EXT4_SB(inode
->i_sb
)->s_es
;
538 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
539 es
->s_last_error_block
= cpu_to_le64(block
);
540 save_error_info(inode
->i_sb
, function
, line
);
545 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
546 "inode #%lu: block %llu: comm %s: %pV\n",
547 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
548 block
, current
->comm
, &vaf
);
550 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
551 "inode #%lu: comm %s: %pV\n",
552 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
553 current
->comm
, &vaf
);
556 ext4_handle_error(inode
->i_sb
);
559 void ext4_error_file(struct file
*file
, const char *function
,
560 unsigned int line
, ext4_fsblk_t block
,
561 const char *fmt
, ...)
564 struct va_format vaf
;
565 struct ext4_super_block
*es
;
566 struct inode
*inode
= file
->f_dentry
->d_inode
;
567 char pathname
[80], *path
;
569 es
= EXT4_SB(inode
->i_sb
)->s_es
;
570 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
571 save_error_info(inode
->i_sb
, function
, line
);
572 path
= d_path(&(file
->f_path
), pathname
, sizeof(pathname
));
580 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
581 "block %llu: comm %s: path %s: %pV\n",
582 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
583 block
, current
->comm
, path
, &vaf
);
586 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
587 "comm %s: path %s: %pV\n",
588 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
589 current
->comm
, path
, &vaf
);
592 ext4_handle_error(inode
->i_sb
);
595 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
602 errstr
= "IO failure";
605 errstr
= "Out of memory";
608 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
609 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
610 errstr
= "Journal has aborted";
612 errstr
= "Readonly filesystem";
615 /* If the caller passed in an extra buffer for unknown
616 * errors, textualise them now. Else we just return
619 /* Check for truncated error codes... */
620 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
629 /* __ext4_std_error decodes expected errors from journaling functions
630 * automatically and invokes the appropriate error response. */
632 void __ext4_std_error(struct super_block
*sb
, const char *function
,
633 unsigned int line
, int errno
)
638 /* Special case: if the error is EROFS, and we're not already
639 * inside a transaction, then there's really no point in logging
641 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
642 (sb
->s_flags
& MS_RDONLY
))
645 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
646 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s:%d: %s\n",
647 sb
->s_id
, function
, line
, errstr
);
648 save_error_info(sb
, function
, line
);
650 ext4_handle_error(sb
);
654 * ext4_abort is a much stronger failure handler than ext4_error. The
655 * abort function may be used to deal with unrecoverable failures such
656 * as journal IO errors or ENOMEM at a critical moment in log management.
658 * We unconditionally force the filesystem into an ABORT|READONLY state,
659 * unless the error response on the fs has been set to panic in which
660 * case we take the easy way out and panic immediately.
663 void __ext4_abort(struct super_block
*sb
, const char *function
,
664 unsigned int line
, const char *fmt
, ...)
668 save_error_info(sb
, function
, line
);
670 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: ", sb
->s_id
,
676 if ((sb
->s_flags
& MS_RDONLY
) == 0) {
677 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
678 sb
->s_flags
|= MS_RDONLY
;
679 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
680 if (EXT4_SB(sb
)->s_journal
)
681 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
682 save_error_info(sb
, function
, line
);
684 if (test_opt(sb
, ERRORS_PANIC
))
685 panic("EXT4-fs panic from previous error\n");
688 void ext4_msg(struct super_block
*sb
, const char *prefix
, const char *fmt
, ...)
690 struct va_format vaf
;
696 printk("%sEXT4-fs (%s): %pV\n", prefix
, sb
->s_id
, &vaf
);
700 void __ext4_warning(struct super_block
*sb
, const char *function
,
701 unsigned int line
, const char *fmt
, ...)
703 struct va_format vaf
;
709 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: %pV\n",
710 sb
->s_id
, function
, line
, &vaf
);
714 void __ext4_grp_locked_error(const char *function
, unsigned int line
,
715 struct super_block
*sb
, ext4_group_t grp
,
716 unsigned long ino
, ext4_fsblk_t block
,
717 const char *fmt
, ...)
721 struct va_format vaf
;
723 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
725 es
->s_last_error_ino
= cpu_to_le32(ino
);
726 es
->s_last_error_block
= cpu_to_le64(block
);
727 __save_error_info(sb
, function
, line
);
733 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: group %u, ",
734 sb
->s_id
, function
, line
, grp
);
736 printk(KERN_CONT
"inode %lu: ", ino
);
738 printk(KERN_CONT
"block %llu:", (unsigned long long) block
);
739 printk(KERN_CONT
"%pV\n", &vaf
);
742 if (test_opt(sb
, ERRORS_CONT
)) {
743 ext4_commit_super(sb
, 0);
747 ext4_unlock_group(sb
, grp
);
748 ext4_handle_error(sb
);
750 * We only get here in the ERRORS_RO case; relocking the group
751 * may be dangerous, but nothing bad will happen since the
752 * filesystem will have already been marked read/only and the
753 * journal has been aborted. We return 1 as a hint to callers
754 * who might what to use the return value from
755 * ext4_grp_locked_error() to distinguish between the
756 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
757 * aggressively from the ext4 function in question, with a
758 * more appropriate error code.
760 ext4_lock_group(sb
, grp
);
764 void ext4_update_dynamic_rev(struct super_block
*sb
)
766 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
768 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
772 "updating to rev %d because of new feature flag, "
773 "running e2fsck is recommended",
776 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
777 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
778 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
779 /* leave es->s_feature_*compat flags alone */
780 /* es->s_uuid will be set by e2fsck if empty */
783 * The rest of the superblock fields should be zero, and if not it
784 * means they are likely already in use, so leave them alone. We
785 * can leave it up to e2fsck to clean up any inconsistencies there.
790 * Open the external journal device
792 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
794 struct block_device
*bdev
;
795 char b
[BDEVNAME_SIZE
];
797 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
, sb
);
803 ext4_msg(sb
, KERN_ERR
, "failed to open journal device %s: %ld",
804 __bdevname(dev
, b
), PTR_ERR(bdev
));
809 * Release the journal device
811 static int ext4_blkdev_put(struct block_device
*bdev
)
813 return blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
816 static int ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
818 struct block_device
*bdev
;
821 bdev
= sbi
->journal_bdev
;
823 ret
= ext4_blkdev_put(bdev
);
824 sbi
->journal_bdev
= NULL
;
829 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
831 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
834 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
838 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
839 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
841 printk(KERN_ERR
"sb_info orphan list:\n");
842 list_for_each(l
, &sbi
->s_orphan
) {
843 struct inode
*inode
= orphan_list_entry(l
);
845 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
846 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
847 inode
->i_mode
, inode
->i_nlink
,
852 static void ext4_put_super(struct super_block
*sb
)
854 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
855 struct ext4_super_block
*es
= sbi
->s_es
;
858 ext4_unregister_li_request(sb
);
859 dquot_disable(sb
, -1, DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
861 flush_workqueue(sbi
->dio_unwritten_wq
);
862 destroy_workqueue(sbi
->dio_unwritten_wq
);
865 if (sbi
->s_journal
) {
866 err
= jbd2_journal_destroy(sbi
->s_journal
);
867 sbi
->s_journal
= NULL
;
869 ext4_abort(sb
, "Couldn't clean up the journal");
872 del_timer(&sbi
->s_err_report
);
873 ext4_release_system_zone(sb
);
875 ext4_ext_release(sb
);
876 ext4_xattr_put_super(sb
);
878 if (!(sb
->s_flags
& MS_RDONLY
)) {
879 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
880 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
882 if (!(sb
->s_flags
& MS_RDONLY
))
883 ext4_commit_super(sb
, 1);
886 remove_proc_entry("options", sbi
->s_proc
);
887 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
889 kobject_del(&sbi
->s_kobj
);
891 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
892 brelse(sbi
->s_group_desc
[i
]);
893 ext4_kvfree(sbi
->s_group_desc
);
894 ext4_kvfree(sbi
->s_flex_groups
);
895 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
896 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
897 percpu_counter_destroy(&sbi
->s_dirs_counter
);
898 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
901 for (i
= 0; i
< MAXQUOTAS
; i
++)
902 kfree(sbi
->s_qf_names
[i
]);
905 /* Debugging code just in case the in-memory inode orphan list
906 * isn't empty. The on-disk one can be non-empty if we've
907 * detected an error and taken the fs readonly, but the
908 * in-memory list had better be clean by this point. */
909 if (!list_empty(&sbi
->s_orphan
))
910 dump_orphan_list(sb
, sbi
);
911 J_ASSERT(list_empty(&sbi
->s_orphan
));
913 invalidate_bdev(sb
->s_bdev
);
914 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
916 * Invalidate the journal device's buffers. We don't want them
917 * floating about in memory - the physical journal device may
918 * hotswapped, and it breaks the `ro-after' testing code.
920 sync_blockdev(sbi
->journal_bdev
);
921 invalidate_bdev(sbi
->journal_bdev
);
922 ext4_blkdev_remove(sbi
);
925 kthread_stop(sbi
->s_mmp_tsk
);
926 sb
->s_fs_info
= NULL
;
928 * Now that we are completely done shutting down the
929 * superblock, we need to actually destroy the kobject.
932 kobject_put(&sbi
->s_kobj
);
933 wait_for_completion(&sbi
->s_kobj_unregister
);
934 if (sbi
->s_chksum_driver
)
935 crypto_free_shash(sbi
->s_chksum_driver
);
936 kfree(sbi
->s_blockgroup_lock
);
940 static struct kmem_cache
*ext4_inode_cachep
;
943 * Called inside transaction, so use GFP_NOFS
945 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
947 struct ext4_inode_info
*ei
;
949 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
953 ei
->vfs_inode
.i_version
= 1;
954 ei
->vfs_inode
.i_data
.writeback_index
= 0;
955 memset(&ei
->i_cached_extent
, 0, sizeof(struct ext4_ext_cache
));
956 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
957 spin_lock_init(&ei
->i_prealloc_lock
);
958 ei
->i_reserved_data_blocks
= 0;
959 ei
->i_reserved_meta_blocks
= 0;
960 ei
->i_allocated_meta_blocks
= 0;
961 ei
->i_da_metadata_calc_len
= 0;
962 spin_lock_init(&(ei
->i_block_reservation_lock
));
964 ei
->i_reserved_quota
= 0;
967 INIT_LIST_HEAD(&ei
->i_completed_io_list
);
968 spin_lock_init(&ei
->i_completed_io_lock
);
969 ei
->cur_aio_dio
= NULL
;
971 ei
->i_datasync_tid
= 0;
972 atomic_set(&ei
->i_ioend_count
, 0);
973 atomic_set(&ei
->i_aiodio_unwritten
, 0);
975 return &ei
->vfs_inode
;
978 static int ext4_drop_inode(struct inode
*inode
)
980 int drop
= generic_drop_inode(inode
);
982 trace_ext4_drop_inode(inode
, drop
);
986 static void ext4_i_callback(struct rcu_head
*head
)
988 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
989 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
992 static void ext4_destroy_inode(struct inode
*inode
)
994 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
995 ext4_msg(inode
->i_sb
, KERN_ERR
,
996 "Inode %lu (%p): orphan list check failed!",
997 inode
->i_ino
, EXT4_I(inode
));
998 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
999 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
1003 call_rcu(&inode
->i_rcu
, ext4_i_callback
);
1006 static void init_once(void *foo
)
1008 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
1010 INIT_LIST_HEAD(&ei
->i_orphan
);
1011 #ifdef CONFIG_EXT4_FS_XATTR
1012 init_rwsem(&ei
->xattr_sem
);
1014 init_rwsem(&ei
->i_data_sem
);
1015 inode_init_once(&ei
->vfs_inode
);
1018 static int init_inodecache(void)
1020 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
1021 sizeof(struct ext4_inode_info
),
1022 0, (SLAB_RECLAIM_ACCOUNT
|
1025 if (ext4_inode_cachep
== NULL
)
1030 static void destroy_inodecache(void)
1032 kmem_cache_destroy(ext4_inode_cachep
);
1035 void ext4_clear_inode(struct inode
*inode
)
1037 invalidate_inode_buffers(inode
);
1040 ext4_discard_preallocations(inode
);
1041 if (EXT4_I(inode
)->jinode
) {
1042 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode
),
1043 EXT4_I(inode
)->jinode
);
1044 jbd2_free_inode(EXT4_I(inode
)->jinode
);
1045 EXT4_I(inode
)->jinode
= NULL
;
1049 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
1050 u64 ino
, u32 generation
)
1052 struct inode
*inode
;
1054 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
1055 return ERR_PTR(-ESTALE
);
1056 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
1057 return ERR_PTR(-ESTALE
);
1059 /* iget isn't really right if the inode is currently unallocated!!
1061 * ext4_read_inode will return a bad_inode if the inode had been
1062 * deleted, so we should be safe.
1064 * Currently we don't know the generation for parent directory, so
1065 * a generation of 0 means "accept any"
1067 inode
= ext4_iget(sb
, ino
);
1069 return ERR_CAST(inode
);
1070 if (generation
&& inode
->i_generation
!= generation
) {
1072 return ERR_PTR(-ESTALE
);
1078 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
1079 int fh_len
, int fh_type
)
1081 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
1082 ext4_nfs_get_inode
);
1085 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
1086 int fh_len
, int fh_type
)
1088 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
1089 ext4_nfs_get_inode
);
1093 * Try to release metadata pages (indirect blocks, directories) which are
1094 * mapped via the block device. Since these pages could have journal heads
1095 * which would prevent try_to_free_buffers() from freeing them, we must use
1096 * jbd2 layer's try_to_free_buffers() function to release them.
1098 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
1101 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
1103 WARN_ON(PageChecked(page
));
1104 if (!page_has_buffers(page
))
1107 return jbd2_journal_try_to_free_buffers(journal
, page
,
1108 wait
& ~__GFP_WAIT
);
1109 return try_to_free_buffers(page
);
1113 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1114 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1116 static int ext4_write_dquot(struct dquot
*dquot
);
1117 static int ext4_acquire_dquot(struct dquot
*dquot
);
1118 static int ext4_release_dquot(struct dquot
*dquot
);
1119 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1120 static int ext4_write_info(struct super_block
*sb
, int type
);
1121 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1123 static int ext4_quota_on_sysfile(struct super_block
*sb
, int type
,
1125 static int ext4_quota_off(struct super_block
*sb
, int type
);
1126 static int ext4_quota_off_sysfile(struct super_block
*sb
, int type
);
1127 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1128 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1129 size_t len
, loff_t off
);
1130 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1131 const char *data
, size_t len
, loff_t off
);
1132 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
1133 unsigned int flags
);
1134 static int ext4_enable_quotas(struct super_block
*sb
);
1136 static const struct dquot_operations ext4_quota_operations
= {
1137 .get_reserved_space
= ext4_get_reserved_space
,
1138 .write_dquot
= ext4_write_dquot
,
1139 .acquire_dquot
= ext4_acquire_dquot
,
1140 .release_dquot
= ext4_release_dquot
,
1141 .mark_dirty
= ext4_mark_dquot_dirty
,
1142 .write_info
= ext4_write_info
,
1143 .alloc_dquot
= dquot_alloc
,
1144 .destroy_dquot
= dquot_destroy
,
1147 static const struct quotactl_ops ext4_qctl_operations
= {
1148 .quota_on
= ext4_quota_on
,
1149 .quota_off
= ext4_quota_off
,
1150 .quota_sync
= dquot_quota_sync
,
1151 .get_info
= dquot_get_dqinfo
,
1152 .set_info
= dquot_set_dqinfo
,
1153 .get_dqblk
= dquot_get_dqblk
,
1154 .set_dqblk
= dquot_set_dqblk
1157 static const struct quotactl_ops ext4_qctl_sysfile_operations
= {
1158 .quota_on_meta
= ext4_quota_on_sysfile
,
1159 .quota_off
= ext4_quota_off_sysfile
,
1160 .quota_sync
= dquot_quota_sync
,
1161 .get_info
= dquot_get_dqinfo
,
1162 .set_info
= dquot_set_dqinfo
,
1163 .get_dqblk
= dquot_get_dqblk
,
1164 .set_dqblk
= dquot_set_dqblk
1168 static const struct super_operations ext4_sops
= {
1169 .alloc_inode
= ext4_alloc_inode
,
1170 .destroy_inode
= ext4_destroy_inode
,
1171 .write_inode
= ext4_write_inode
,
1172 .dirty_inode
= ext4_dirty_inode
,
1173 .drop_inode
= ext4_drop_inode
,
1174 .evict_inode
= ext4_evict_inode
,
1175 .put_super
= ext4_put_super
,
1176 .sync_fs
= ext4_sync_fs
,
1177 .freeze_fs
= ext4_freeze
,
1178 .unfreeze_fs
= ext4_unfreeze
,
1179 .statfs
= ext4_statfs
,
1180 .remount_fs
= ext4_remount
,
1181 .show_options
= ext4_show_options
,
1183 .quota_read
= ext4_quota_read
,
1184 .quota_write
= ext4_quota_write
,
1186 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1189 static const struct super_operations ext4_nojournal_sops
= {
1190 .alloc_inode
= ext4_alloc_inode
,
1191 .destroy_inode
= ext4_destroy_inode
,
1192 .write_inode
= ext4_write_inode
,
1193 .dirty_inode
= ext4_dirty_inode
,
1194 .drop_inode
= ext4_drop_inode
,
1195 .evict_inode
= ext4_evict_inode
,
1196 .put_super
= ext4_put_super
,
1197 .statfs
= ext4_statfs
,
1198 .remount_fs
= ext4_remount
,
1199 .show_options
= ext4_show_options
,
1201 .quota_read
= ext4_quota_read
,
1202 .quota_write
= ext4_quota_write
,
1204 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1207 static const struct export_operations ext4_export_ops
= {
1208 .fh_to_dentry
= ext4_fh_to_dentry
,
1209 .fh_to_parent
= ext4_fh_to_parent
,
1210 .get_parent
= ext4_get_parent
,
1214 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1215 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1216 Opt_nouid32
, Opt_debug
, Opt_removed
,
1217 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1218 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
,
1219 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
,
1220 Opt_journal_dev
, Opt_journal_checksum
, Opt_journal_async_commit
,
1221 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1222 Opt_data_err_abort
, Opt_data_err_ignore
,
1223 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1224 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1225 Opt_noquota
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1226 Opt_usrquota
, Opt_grpquota
, Opt_i_version
,
1227 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
, Opt_mblk_io_submit
,
1228 Opt_nomblk_io_submit
, Opt_block_validity
, Opt_noblock_validity
,
1229 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1230 Opt_dioread_nolock
, Opt_dioread_lock
,
1231 Opt_discard
, Opt_nodiscard
, Opt_init_itable
, Opt_noinit_itable
,
1234 static const match_table_t tokens
= {
1235 {Opt_bsd_df
, "bsddf"},
1236 {Opt_minix_df
, "minixdf"},
1237 {Opt_grpid
, "grpid"},
1238 {Opt_grpid
, "bsdgroups"},
1239 {Opt_nogrpid
, "nogrpid"},
1240 {Opt_nogrpid
, "sysvgroups"},
1241 {Opt_resgid
, "resgid=%u"},
1242 {Opt_resuid
, "resuid=%u"},
1244 {Opt_err_cont
, "errors=continue"},
1245 {Opt_err_panic
, "errors=panic"},
1246 {Opt_err_ro
, "errors=remount-ro"},
1247 {Opt_nouid32
, "nouid32"},
1248 {Opt_debug
, "debug"},
1249 {Opt_removed
, "oldalloc"},
1250 {Opt_removed
, "orlov"},
1251 {Opt_user_xattr
, "user_xattr"},
1252 {Opt_nouser_xattr
, "nouser_xattr"},
1254 {Opt_noacl
, "noacl"},
1255 {Opt_noload
, "norecovery"},
1256 {Opt_noload
, "noload"},
1257 {Opt_removed
, "nobh"},
1258 {Opt_removed
, "bh"},
1259 {Opt_commit
, "commit=%u"},
1260 {Opt_min_batch_time
, "min_batch_time=%u"},
1261 {Opt_max_batch_time
, "max_batch_time=%u"},
1262 {Opt_journal_dev
, "journal_dev=%u"},
1263 {Opt_journal_checksum
, "journal_checksum"},
1264 {Opt_journal_async_commit
, "journal_async_commit"},
1265 {Opt_abort
, "abort"},
1266 {Opt_data_journal
, "data=journal"},
1267 {Opt_data_ordered
, "data=ordered"},
1268 {Opt_data_writeback
, "data=writeback"},
1269 {Opt_data_err_abort
, "data_err=abort"},
1270 {Opt_data_err_ignore
, "data_err=ignore"},
1271 {Opt_offusrjquota
, "usrjquota="},
1272 {Opt_usrjquota
, "usrjquota=%s"},
1273 {Opt_offgrpjquota
, "grpjquota="},
1274 {Opt_grpjquota
, "grpjquota=%s"},
1275 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1276 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1277 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1278 {Opt_grpquota
, "grpquota"},
1279 {Opt_noquota
, "noquota"},
1280 {Opt_quota
, "quota"},
1281 {Opt_usrquota
, "usrquota"},
1282 {Opt_barrier
, "barrier=%u"},
1283 {Opt_barrier
, "barrier"},
1284 {Opt_nobarrier
, "nobarrier"},
1285 {Opt_i_version
, "i_version"},
1286 {Opt_stripe
, "stripe=%u"},
1287 {Opt_delalloc
, "delalloc"},
1288 {Opt_nodelalloc
, "nodelalloc"},
1289 {Opt_mblk_io_submit
, "mblk_io_submit"},
1290 {Opt_nomblk_io_submit
, "nomblk_io_submit"},
1291 {Opt_block_validity
, "block_validity"},
1292 {Opt_noblock_validity
, "noblock_validity"},
1293 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1294 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1295 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1296 {Opt_auto_da_alloc
, "auto_da_alloc"},
1297 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1298 {Opt_dioread_nolock
, "dioread_nolock"},
1299 {Opt_dioread_lock
, "dioread_lock"},
1300 {Opt_discard
, "discard"},
1301 {Opt_nodiscard
, "nodiscard"},
1302 {Opt_init_itable
, "init_itable=%u"},
1303 {Opt_init_itable
, "init_itable"},
1304 {Opt_noinit_itable
, "noinit_itable"},
1305 {Opt_removed
, "check=none"}, /* mount option from ext2/3 */
1306 {Opt_removed
, "nocheck"}, /* mount option from ext2/3 */
1307 {Opt_removed
, "reservation"}, /* mount option from ext2/3 */
1308 {Opt_removed
, "noreservation"}, /* mount option from ext2/3 */
1309 {Opt_removed
, "journal=%u"}, /* mount option from ext2/3 */
1313 static ext4_fsblk_t
get_sb_block(void **data
)
1315 ext4_fsblk_t sb_block
;
1316 char *options
= (char *) *data
;
1318 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1319 return 1; /* Default location */
1322 /* TODO: use simple_strtoll with >32bit ext4 */
1323 sb_block
= simple_strtoul(options
, &options
, 0);
1324 if (*options
&& *options
!= ',') {
1325 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1329 if (*options
== ',')
1331 *data
= (void *) options
;
1336 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1337 static char deprecated_msg
[] = "Mount option \"%s\" will be removed by %s\n"
1338 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1341 static int set_qf_name(struct super_block
*sb
, int qtype
, substring_t
*args
)
1343 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1346 if (sb_any_quota_loaded(sb
) &&
1347 !sbi
->s_qf_names
[qtype
]) {
1348 ext4_msg(sb
, KERN_ERR
,
1349 "Cannot change journaled "
1350 "quota options when quota turned on");
1353 qname
= match_strdup(args
);
1355 ext4_msg(sb
, KERN_ERR
,
1356 "Not enough memory for storing quotafile name");
1359 if (sbi
->s_qf_names
[qtype
] &&
1360 strcmp(sbi
->s_qf_names
[qtype
], qname
)) {
1361 ext4_msg(sb
, KERN_ERR
,
1362 "%s quota file already specified", QTYPE2NAME(qtype
));
1366 sbi
->s_qf_names
[qtype
] = qname
;
1367 if (strchr(sbi
->s_qf_names
[qtype
], '/')) {
1368 ext4_msg(sb
, KERN_ERR
,
1369 "quotafile must be on filesystem root");
1370 kfree(sbi
->s_qf_names
[qtype
]);
1371 sbi
->s_qf_names
[qtype
] = NULL
;
1378 static int clear_qf_name(struct super_block
*sb
, int qtype
)
1381 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1383 if (sb_any_quota_loaded(sb
) &&
1384 sbi
->s_qf_names
[qtype
]) {
1385 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled quota options"
1386 " when quota turned on");
1390 * The space will be released later when all options are confirmed
1393 sbi
->s_qf_names
[qtype
] = NULL
;
1398 #define MOPT_SET 0x0001
1399 #define MOPT_CLEAR 0x0002
1400 #define MOPT_NOSUPPORT 0x0004
1401 #define MOPT_EXPLICIT 0x0008
1402 #define MOPT_CLEAR_ERR 0x0010
1403 #define MOPT_GTE0 0x0020
1406 #define MOPT_QFMT 0x0040
1408 #define MOPT_Q MOPT_NOSUPPORT
1409 #define MOPT_QFMT MOPT_NOSUPPORT
1411 #define MOPT_DATAJ 0x0080
1413 static const struct mount_opts
{
1417 } ext4_mount_opts
[] = {
1418 {Opt_minix_df
, EXT4_MOUNT_MINIX_DF
, MOPT_SET
},
1419 {Opt_bsd_df
, EXT4_MOUNT_MINIX_DF
, MOPT_CLEAR
},
1420 {Opt_grpid
, EXT4_MOUNT_GRPID
, MOPT_SET
},
1421 {Opt_nogrpid
, EXT4_MOUNT_GRPID
, MOPT_CLEAR
},
1422 {Opt_mblk_io_submit
, EXT4_MOUNT_MBLK_IO_SUBMIT
, MOPT_SET
},
1423 {Opt_nomblk_io_submit
, EXT4_MOUNT_MBLK_IO_SUBMIT
, MOPT_CLEAR
},
1424 {Opt_block_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_SET
},
1425 {Opt_noblock_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_CLEAR
},
1426 {Opt_dioread_nolock
, EXT4_MOUNT_DIOREAD_NOLOCK
, MOPT_SET
},
1427 {Opt_dioread_lock
, EXT4_MOUNT_DIOREAD_NOLOCK
, MOPT_CLEAR
},
1428 {Opt_discard
, EXT4_MOUNT_DISCARD
, MOPT_SET
},
1429 {Opt_nodiscard
, EXT4_MOUNT_DISCARD
, MOPT_CLEAR
},
1430 {Opt_delalloc
, EXT4_MOUNT_DELALLOC
, MOPT_SET
| MOPT_EXPLICIT
},
1431 {Opt_nodelalloc
, EXT4_MOUNT_DELALLOC
, MOPT_CLEAR
| MOPT_EXPLICIT
},
1432 {Opt_journal_checksum
, EXT4_MOUNT_JOURNAL_CHECKSUM
, MOPT_SET
},
1433 {Opt_journal_async_commit
, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT
|
1434 EXT4_MOUNT_JOURNAL_CHECKSUM
), MOPT_SET
},
1435 {Opt_noload
, EXT4_MOUNT_NOLOAD
, MOPT_SET
},
1436 {Opt_err_panic
, EXT4_MOUNT_ERRORS_PANIC
, MOPT_SET
| MOPT_CLEAR_ERR
},
1437 {Opt_err_ro
, EXT4_MOUNT_ERRORS_RO
, MOPT_SET
| MOPT_CLEAR_ERR
},
1438 {Opt_err_cont
, EXT4_MOUNT_ERRORS_CONT
, MOPT_SET
| MOPT_CLEAR_ERR
},
1439 {Opt_data_err_abort
, EXT4_MOUNT_DATA_ERR_ABORT
, MOPT_SET
},
1440 {Opt_data_err_ignore
, EXT4_MOUNT_DATA_ERR_ABORT
, MOPT_CLEAR
},
1441 {Opt_barrier
, EXT4_MOUNT_BARRIER
, MOPT_SET
},
1442 {Opt_nobarrier
, EXT4_MOUNT_BARRIER
, MOPT_CLEAR
},
1443 {Opt_noauto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_SET
},
1444 {Opt_auto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_CLEAR
},
1445 {Opt_noinit_itable
, EXT4_MOUNT_INIT_INODE_TABLE
, MOPT_CLEAR
},
1446 {Opt_commit
, 0, MOPT_GTE0
},
1447 {Opt_max_batch_time
, 0, MOPT_GTE0
},
1448 {Opt_min_batch_time
, 0, MOPT_GTE0
},
1449 {Opt_inode_readahead_blks
, 0, MOPT_GTE0
},
1450 {Opt_init_itable
, 0, MOPT_GTE0
},
1451 {Opt_stripe
, 0, MOPT_GTE0
},
1452 {Opt_data_journal
, EXT4_MOUNT_JOURNAL_DATA
, MOPT_DATAJ
},
1453 {Opt_data_ordered
, EXT4_MOUNT_ORDERED_DATA
, MOPT_DATAJ
},
1454 {Opt_data_writeback
, EXT4_MOUNT_WRITEBACK_DATA
, MOPT_DATAJ
},
1455 #ifdef CONFIG_EXT4_FS_XATTR
1456 {Opt_user_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_SET
},
1457 {Opt_nouser_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_CLEAR
},
1459 {Opt_user_xattr
, 0, MOPT_NOSUPPORT
},
1460 {Opt_nouser_xattr
, 0, MOPT_NOSUPPORT
},
1462 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1463 {Opt_acl
, EXT4_MOUNT_POSIX_ACL
, MOPT_SET
},
1464 {Opt_noacl
, EXT4_MOUNT_POSIX_ACL
, MOPT_CLEAR
},
1466 {Opt_acl
, 0, MOPT_NOSUPPORT
},
1467 {Opt_noacl
, 0, MOPT_NOSUPPORT
},
1469 {Opt_nouid32
, EXT4_MOUNT_NO_UID32
, MOPT_SET
},
1470 {Opt_debug
, EXT4_MOUNT_DEBUG
, MOPT_SET
},
1471 {Opt_quota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
, MOPT_SET
| MOPT_Q
},
1472 {Opt_usrquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
,
1474 {Opt_grpquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_GRPQUOTA
,
1476 {Opt_noquota
, (EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
|
1477 EXT4_MOUNT_GRPQUOTA
), MOPT_CLEAR
| MOPT_Q
},
1478 {Opt_usrjquota
, 0, MOPT_Q
},
1479 {Opt_grpjquota
, 0, MOPT_Q
},
1480 {Opt_offusrjquota
, 0, MOPT_Q
},
1481 {Opt_offgrpjquota
, 0, MOPT_Q
},
1482 {Opt_jqfmt_vfsold
, QFMT_VFS_OLD
, MOPT_QFMT
},
1483 {Opt_jqfmt_vfsv0
, QFMT_VFS_V0
, MOPT_QFMT
},
1484 {Opt_jqfmt_vfsv1
, QFMT_VFS_V1
, MOPT_QFMT
},
1488 static int handle_mount_opt(struct super_block
*sb
, char *opt
, int token
,
1489 substring_t
*args
, unsigned long *journal_devnum
,
1490 unsigned int *journal_ioprio
, int is_remount
)
1492 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1493 const struct mount_opts
*m
;
1499 if (token
== Opt_usrjquota
)
1500 return set_qf_name(sb
, USRQUOTA
, &args
[0]);
1501 else if (token
== Opt_grpjquota
)
1502 return set_qf_name(sb
, GRPQUOTA
, &args
[0]);
1503 else if (token
== Opt_offusrjquota
)
1504 return clear_qf_name(sb
, USRQUOTA
);
1505 else if (token
== Opt_offgrpjquota
)
1506 return clear_qf_name(sb
, GRPQUOTA
);
1508 if (args
->from
&& match_int(args
, &arg
))
1512 case Opt_nouser_xattr
:
1513 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, opt
, "3.5");
1516 return 1; /* handled by get_sb_block() */
1518 ext4_msg(sb
, KERN_WARNING
,
1519 "Ignoring removed %s option", opt
);
1522 uid
= make_kuid(current_user_ns(), arg
);
1523 if (!uid_valid(uid
)) {
1524 ext4_msg(sb
, KERN_ERR
, "Invalid uid value %d", arg
);
1527 sbi
->s_resuid
= uid
;
1530 gid
= make_kgid(current_user_ns(), arg
);
1531 if (!gid_valid(gid
)) {
1532 ext4_msg(sb
, KERN_ERR
, "Invalid gid value %d", arg
);
1535 sbi
->s_resgid
= gid
;
1538 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1541 sb
->s_flags
|= MS_I_VERSION
;
1543 case Opt_journal_dev
:
1545 ext4_msg(sb
, KERN_ERR
,
1546 "Cannot specify journal on remount");
1549 *journal_devnum
= arg
;
1551 case Opt_journal_ioprio
:
1552 if (arg
< 0 || arg
> 7)
1554 *journal_ioprio
= IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
, arg
);
1558 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++) {
1559 if (token
!= m
->token
)
1561 if (args
->from
&& (m
->flags
& MOPT_GTE0
) && (arg
< 0))
1563 if (m
->flags
& MOPT_EXPLICIT
)
1564 set_opt2(sb
, EXPLICIT_DELALLOC
);
1565 if (m
->flags
& MOPT_CLEAR_ERR
)
1566 clear_opt(sb
, ERRORS_MASK
);
1567 if (token
== Opt_noquota
&& sb_any_quota_loaded(sb
)) {
1568 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1569 "options when quota turned on");
1573 if (m
->flags
& MOPT_NOSUPPORT
) {
1574 ext4_msg(sb
, KERN_ERR
, "%s option not supported", opt
);
1575 } else if (token
== Opt_commit
) {
1577 arg
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1578 sbi
->s_commit_interval
= HZ
* arg
;
1579 } else if (token
== Opt_max_batch_time
) {
1581 arg
= EXT4_DEF_MAX_BATCH_TIME
;
1582 sbi
->s_max_batch_time
= arg
;
1583 } else if (token
== Opt_min_batch_time
) {
1584 sbi
->s_min_batch_time
= arg
;
1585 } else if (token
== Opt_inode_readahead_blks
) {
1586 if (arg
> (1 << 30))
1588 if (arg
&& !is_power_of_2(arg
)) {
1589 ext4_msg(sb
, KERN_ERR
,
1590 "EXT4-fs: inode_readahead_blks"
1591 " must be a power of 2");
1594 sbi
->s_inode_readahead_blks
= arg
;
1595 } else if (token
== Opt_init_itable
) {
1596 set_opt(sb
, INIT_INODE_TABLE
);
1598 arg
= EXT4_DEF_LI_WAIT_MULT
;
1599 sbi
->s_li_wait_mult
= arg
;
1600 } else if (token
== Opt_stripe
) {
1601 sbi
->s_stripe
= arg
;
1602 } else if (m
->flags
& MOPT_DATAJ
) {
1604 if (!sbi
->s_journal
)
1605 ext4_msg(sb
, KERN_WARNING
, "Remounting file system with no journal so ignoring journalled data option");
1606 else if (test_opt(sb
, DATA_FLAGS
) !=
1608 ext4_msg(sb
, KERN_ERR
,
1609 "Cannot change data mode on remount");
1613 clear_opt(sb
, DATA_FLAGS
);
1614 sbi
->s_mount_opt
|= m
->mount_opt
;
1617 } else if (m
->flags
& MOPT_QFMT
) {
1618 if (sb_any_quota_loaded(sb
) &&
1619 sbi
->s_jquota_fmt
!= m
->mount_opt
) {
1620 ext4_msg(sb
, KERN_ERR
, "Cannot "
1621 "change journaled quota options "
1622 "when quota turned on");
1625 sbi
->s_jquota_fmt
= m
->mount_opt
;
1630 if (m
->flags
& MOPT_CLEAR
)
1632 else if (unlikely(!(m
->flags
& MOPT_SET
))) {
1633 ext4_msg(sb
, KERN_WARNING
,
1634 "buggy handling of option %s", opt
);
1639 sbi
->s_mount_opt
|= m
->mount_opt
;
1641 sbi
->s_mount_opt
&= ~m
->mount_opt
;
1645 ext4_msg(sb
, KERN_ERR
, "Unrecognized mount option \"%s\" "
1646 "or missing value", opt
);
1650 static int parse_options(char *options
, struct super_block
*sb
,
1651 unsigned long *journal_devnum
,
1652 unsigned int *journal_ioprio
,
1656 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1659 substring_t args
[MAX_OPT_ARGS
];
1665 while ((p
= strsep(&options
, ",")) != NULL
) {
1669 * Initialize args struct so we know whether arg was
1670 * found; some options take optional arguments.
1672 args
[0].to
= args
[0].from
= 0;
1673 token
= match_token(p
, tokens
, args
);
1674 if (handle_mount_opt(sb
, p
, token
, args
, journal_devnum
,
1675 journal_ioprio
, is_remount
) < 0)
1679 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1680 if (test_opt(sb
, USRQUOTA
) && sbi
->s_qf_names
[USRQUOTA
])
1681 clear_opt(sb
, USRQUOTA
);
1683 if (test_opt(sb
, GRPQUOTA
) && sbi
->s_qf_names
[GRPQUOTA
])
1684 clear_opt(sb
, GRPQUOTA
);
1686 if (test_opt(sb
, GRPQUOTA
) || test_opt(sb
, USRQUOTA
)) {
1687 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1692 if (!sbi
->s_jquota_fmt
) {
1693 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1698 if (sbi
->s_jquota_fmt
) {
1699 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1700 "specified with no journaling "
1709 static inline void ext4_show_quota_options(struct seq_file
*seq
,
1710 struct super_block
*sb
)
1712 #if defined(CONFIG_QUOTA)
1713 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1715 if (sbi
->s_jquota_fmt
) {
1718 switch (sbi
->s_jquota_fmt
) {
1729 seq_printf(seq
, ",jqfmt=%s", fmtname
);
1732 if (sbi
->s_qf_names
[USRQUOTA
])
1733 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
1735 if (sbi
->s_qf_names
[GRPQUOTA
])
1736 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
1738 if (test_opt(sb
, USRQUOTA
))
1739 seq_puts(seq
, ",usrquota");
1741 if (test_opt(sb
, GRPQUOTA
))
1742 seq_puts(seq
, ",grpquota");
1746 static const char *token2str(int token
)
1748 static const struct match_token
*t
;
1750 for (t
= tokens
; t
->token
!= Opt_err
; t
++)
1751 if (t
->token
== token
&& !strchr(t
->pattern
, '='))
1758 * - it's set to a non-default value OR
1759 * - if the per-sb default is different from the global default
1761 static int _ext4_show_options(struct seq_file
*seq
, struct super_block
*sb
,
1764 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1765 struct ext4_super_block
*es
= sbi
->s_es
;
1766 int def_errors
, def_mount_opt
= nodefs
? 0 : sbi
->s_def_mount_opt
;
1767 const struct mount_opts
*m
;
1768 char sep
= nodefs
? '\n' : ',';
1770 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1771 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1773 if (sbi
->s_sb_block
!= 1)
1774 SEQ_OPTS_PRINT("sb=%llu", sbi
->s_sb_block
);
1776 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++) {
1777 int want_set
= m
->flags
& MOPT_SET
;
1778 if (((m
->flags
& (MOPT_SET
|MOPT_CLEAR
)) == 0) ||
1779 (m
->flags
& MOPT_CLEAR_ERR
))
1781 if (!(m
->mount_opt
& (sbi
->s_mount_opt
^ def_mount_opt
)))
1782 continue; /* skip if same as the default */
1784 (sbi
->s_mount_opt
& m
->mount_opt
) != m
->mount_opt
) ||
1785 (!want_set
&& (sbi
->s_mount_opt
& m
->mount_opt
)))
1786 continue; /* select Opt_noFoo vs Opt_Foo */
1787 SEQ_OPTS_PRINT("%s", token2str(m
->token
));
1790 if (nodefs
|| !uid_eq(sbi
->s_resuid
, make_kuid(&init_user_ns
, EXT4_DEF_RESUID
)) ||
1791 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
)
1792 SEQ_OPTS_PRINT("resuid=%u",
1793 from_kuid_munged(&init_user_ns
, sbi
->s_resuid
));
1794 if (nodefs
|| !gid_eq(sbi
->s_resgid
, make_kgid(&init_user_ns
, EXT4_DEF_RESGID
)) ||
1795 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
)
1796 SEQ_OPTS_PRINT("resgid=%u",
1797 from_kgid_munged(&init_user_ns
, sbi
->s_resgid
));
1798 def_errors
= nodefs
? -1 : le16_to_cpu(es
->s_errors
);
1799 if (test_opt(sb
, ERRORS_RO
) && def_errors
!= EXT4_ERRORS_RO
)
1800 SEQ_OPTS_PUTS("errors=remount-ro");
1801 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
1802 SEQ_OPTS_PUTS("errors=continue");
1803 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
1804 SEQ_OPTS_PUTS("errors=panic");
1805 if (nodefs
|| sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
)
1806 SEQ_OPTS_PRINT("commit=%lu", sbi
->s_commit_interval
/ HZ
);
1807 if (nodefs
|| sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
)
1808 SEQ_OPTS_PRINT("min_batch_time=%u", sbi
->s_min_batch_time
);
1809 if (nodefs
|| sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
)
1810 SEQ_OPTS_PRINT("max_batch_time=%u", sbi
->s_max_batch_time
);
1811 if (sb
->s_flags
& MS_I_VERSION
)
1812 SEQ_OPTS_PUTS("i_version");
1813 if (nodefs
|| sbi
->s_stripe
)
1814 SEQ_OPTS_PRINT("stripe=%lu", sbi
->s_stripe
);
1815 if (EXT4_MOUNT_DATA_FLAGS
& (sbi
->s_mount_opt
^ def_mount_opt
)) {
1816 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
1817 SEQ_OPTS_PUTS("data=journal");
1818 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
1819 SEQ_OPTS_PUTS("data=ordered");
1820 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
1821 SEQ_OPTS_PUTS("data=writeback");
1824 sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
1825 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1826 sbi
->s_inode_readahead_blks
);
1828 if (nodefs
|| (test_opt(sb
, INIT_INODE_TABLE
) &&
1829 (sbi
->s_li_wait_mult
!= EXT4_DEF_LI_WAIT_MULT
)))
1830 SEQ_OPTS_PRINT("init_itable=%u", sbi
->s_li_wait_mult
);
1832 ext4_show_quota_options(seq
, sb
);
1836 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
)
1838 return _ext4_show_options(seq
, root
->d_sb
, 0);
1841 static int options_seq_show(struct seq_file
*seq
, void *offset
)
1843 struct super_block
*sb
= seq
->private;
1846 seq_puts(seq
, (sb
->s_flags
& MS_RDONLY
) ? "ro" : "rw");
1847 rc
= _ext4_show_options(seq
, sb
, 1);
1848 seq_puts(seq
, "\n");
1852 static int options_open_fs(struct inode
*inode
, struct file
*file
)
1854 return single_open(file
, options_seq_show
, PDE(inode
)->data
);
1857 static const struct file_operations ext4_seq_options_fops
= {
1858 .owner
= THIS_MODULE
,
1859 .open
= options_open_fs
,
1861 .llseek
= seq_lseek
,
1862 .release
= single_release
,
1865 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1868 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1871 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1872 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
1873 "forcing read-only mode");
1878 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1879 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
1880 "running e2fsck is recommended");
1881 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1882 ext4_msg(sb
, KERN_WARNING
,
1883 "warning: mounting fs with errors, "
1884 "running e2fsck is recommended");
1885 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) > 0 &&
1886 le16_to_cpu(es
->s_mnt_count
) >=
1887 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1888 ext4_msg(sb
, KERN_WARNING
,
1889 "warning: maximal mount count reached, "
1890 "running e2fsck is recommended");
1891 else if (le32_to_cpu(es
->s_checkinterval
) &&
1892 (le32_to_cpu(es
->s_lastcheck
) +
1893 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1894 ext4_msg(sb
, KERN_WARNING
,
1895 "warning: checktime reached, "
1896 "running e2fsck is recommended");
1897 if (!sbi
->s_journal
)
1898 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1899 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1900 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1901 le16_add_cpu(&es
->s_mnt_count
, 1);
1902 es
->s_mtime
= cpu_to_le32(get_seconds());
1903 ext4_update_dynamic_rev(sb
);
1905 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1907 ext4_commit_super(sb
, 1);
1909 if (test_opt(sb
, DEBUG
))
1910 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
1911 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1913 sbi
->s_groups_count
,
1914 EXT4_BLOCKS_PER_GROUP(sb
),
1915 EXT4_INODES_PER_GROUP(sb
),
1916 sbi
->s_mount_opt
, sbi
->s_mount_opt2
);
1918 cleancache_init_fs(sb
);
1922 static int ext4_fill_flex_info(struct super_block
*sb
)
1924 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1925 struct ext4_group_desc
*gdp
= NULL
;
1926 ext4_group_t flex_group_count
;
1927 ext4_group_t flex_group
;
1928 unsigned int groups_per_flex
= 0;
1932 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1933 if (sbi
->s_log_groups_per_flex
< 1 || sbi
->s_log_groups_per_flex
> 31) {
1934 sbi
->s_log_groups_per_flex
= 0;
1937 groups_per_flex
= 1 << sbi
->s_log_groups_per_flex
;
1939 /* We allocate both existing and potentially added groups */
1940 flex_group_count
= ((sbi
->s_groups_count
+ groups_per_flex
- 1) +
1941 ((le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
) + 1) <<
1942 EXT4_DESC_PER_BLOCK_BITS(sb
))) / groups_per_flex
;
1943 size
= flex_group_count
* sizeof(struct flex_groups
);
1944 sbi
->s_flex_groups
= ext4_kvzalloc(size
, GFP_KERNEL
);
1945 if (sbi
->s_flex_groups
== NULL
) {
1946 ext4_msg(sb
, KERN_ERR
, "not enough memory for %u flex groups",
1951 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1952 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1954 flex_group
= ext4_flex_group(sbi
, i
);
1955 atomic_add(ext4_free_inodes_count(sb
, gdp
),
1956 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
1957 atomic_add(ext4_free_group_clusters(sb
, gdp
),
1958 &sbi
->s_flex_groups
[flex_group
].free_clusters
);
1959 atomic_add(ext4_used_dirs_count(sb
, gdp
),
1960 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
1968 static __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
1969 struct ext4_group_desc
*gdp
)
1973 __le32 le_group
= cpu_to_le32(block_group
);
1975 if ((sbi
->s_es
->s_feature_ro_compat
&
1976 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))) {
1977 /* Use new metadata_csum algorithm */
1981 old_csum
= gdp
->bg_checksum
;
1982 gdp
->bg_checksum
= 0;
1983 csum32
= ext4_chksum(sbi
, sbi
->s_csum_seed
, (__u8
*)&le_group
,
1985 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)gdp
,
1987 gdp
->bg_checksum
= old_csum
;
1989 crc
= csum32
& 0xFFFF;
1993 /* old crc16 code */
1994 offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
1996 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
1997 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
1998 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
1999 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
2000 /* for checksum of struct ext4_group_desc do the rest...*/
2001 if ((sbi
->s_es
->s_feature_incompat
&
2002 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
2003 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
2004 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
2005 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
2009 return cpu_to_le16(crc
);
2012 int ext4_group_desc_csum_verify(struct super_block
*sb
, __u32 block_group
,
2013 struct ext4_group_desc
*gdp
)
2015 if (ext4_has_group_desc_csum(sb
) &&
2016 (gdp
->bg_checksum
!= ext4_group_desc_csum(EXT4_SB(sb
),
2023 void ext4_group_desc_csum_set(struct super_block
*sb
, __u32 block_group
,
2024 struct ext4_group_desc
*gdp
)
2026 if (!ext4_has_group_desc_csum(sb
))
2028 gdp
->bg_checksum
= ext4_group_desc_csum(EXT4_SB(sb
), block_group
, gdp
);
2031 /* Called at mount-time, super-block is locked */
2032 static int ext4_check_descriptors(struct super_block
*sb
,
2033 ext4_group_t
*first_not_zeroed
)
2035 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2036 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
2037 ext4_fsblk_t last_block
;
2038 ext4_fsblk_t block_bitmap
;
2039 ext4_fsblk_t inode_bitmap
;
2040 ext4_fsblk_t inode_table
;
2041 int flexbg_flag
= 0;
2042 ext4_group_t i
, grp
= sbi
->s_groups_count
;
2044 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
2047 ext4_debug("Checking group descriptors");
2049 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
2050 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2052 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
2053 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
2055 last_block
= first_block
+
2056 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2058 if ((grp
== sbi
->s_groups_count
) &&
2059 !(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2062 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
2063 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
2064 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2065 "Block bitmap for group %u not in group "
2066 "(block %llu)!", i
, block_bitmap
);
2069 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
2070 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
2071 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2072 "Inode bitmap for group %u not in group "
2073 "(block %llu)!", i
, inode_bitmap
);
2076 inode_table
= ext4_inode_table(sb
, gdp
);
2077 if (inode_table
< first_block
||
2078 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
2079 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2080 "Inode table for group %u not in group "
2081 "(block %llu)!", i
, inode_table
);
2084 ext4_lock_group(sb
, i
);
2085 if (!ext4_group_desc_csum_verify(sb
, i
, gdp
)) {
2086 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2087 "Checksum for group %u failed (%u!=%u)",
2088 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
2089 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
2090 if (!(sb
->s_flags
& MS_RDONLY
)) {
2091 ext4_unlock_group(sb
, i
);
2095 ext4_unlock_group(sb
, i
);
2097 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
2099 if (NULL
!= first_not_zeroed
)
2100 *first_not_zeroed
= grp
;
2102 ext4_free_blocks_count_set(sbi
->s_es
,
2103 EXT4_C2B(sbi
, ext4_count_free_clusters(sb
)));
2104 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
2108 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2109 * the superblock) which were deleted from all directories, but held open by
2110 * a process at the time of a crash. We walk the list and try to delete these
2111 * inodes at recovery time (only with a read-write filesystem).
2113 * In order to keep the orphan inode chain consistent during traversal (in
2114 * case of crash during recovery), we link each inode into the superblock
2115 * orphan list_head and handle it the same way as an inode deletion during
2116 * normal operation (which journals the operations for us).
2118 * We only do an iget() and an iput() on each inode, which is very safe if we
2119 * accidentally point at an in-use or already deleted inode. The worst that
2120 * can happen in this case is that we get a "bit already cleared" message from
2121 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2122 * e2fsck was run on this filesystem, and it must have already done the orphan
2123 * inode cleanup for us, so we can safely abort without any further action.
2125 static void ext4_orphan_cleanup(struct super_block
*sb
,
2126 struct ext4_super_block
*es
)
2128 unsigned int s_flags
= sb
->s_flags
;
2129 int nr_orphans
= 0, nr_truncates
= 0;
2133 if (!es
->s_last_orphan
) {
2134 jbd_debug(4, "no orphan inodes to clean up\n");
2138 if (bdev_read_only(sb
->s_bdev
)) {
2139 ext4_msg(sb
, KERN_ERR
, "write access "
2140 "unavailable, skipping orphan cleanup");
2144 /* Check if feature set would not allow a r/w mount */
2145 if (!ext4_feature_set_ok(sb
, 0)) {
2146 ext4_msg(sb
, KERN_INFO
, "Skipping orphan cleanup due to "
2147 "unknown ROCOMPAT features");
2151 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2152 if (es
->s_last_orphan
)
2153 jbd_debug(1, "Errors on filesystem, "
2154 "clearing orphan list.\n");
2155 es
->s_last_orphan
= 0;
2156 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2160 if (s_flags
& MS_RDONLY
) {
2161 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
2162 sb
->s_flags
&= ~MS_RDONLY
;
2165 /* Needed for iput() to work correctly and not trash data */
2166 sb
->s_flags
|= MS_ACTIVE
;
2167 /* Turn on quotas so that they are updated correctly */
2168 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2169 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
2170 int ret
= ext4_quota_on_mount(sb
, i
);
2172 ext4_msg(sb
, KERN_ERR
,
2173 "Cannot turn on journaled "
2174 "quota: error %d", ret
);
2179 while (es
->s_last_orphan
) {
2180 struct inode
*inode
;
2182 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
2183 if (IS_ERR(inode
)) {
2184 es
->s_last_orphan
= 0;
2188 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
2189 dquot_initialize(inode
);
2190 if (inode
->i_nlink
) {
2191 ext4_msg(sb
, KERN_DEBUG
,
2192 "%s: truncating inode %lu to %lld bytes",
2193 __func__
, inode
->i_ino
, inode
->i_size
);
2194 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2195 inode
->i_ino
, inode
->i_size
);
2196 ext4_truncate(inode
);
2199 ext4_msg(sb
, KERN_DEBUG
,
2200 "%s: deleting unreferenced inode %lu",
2201 __func__
, inode
->i_ino
);
2202 jbd_debug(2, "deleting unreferenced inode %lu\n",
2206 iput(inode
); /* The delete magic happens here! */
2209 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2212 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
2213 PLURAL(nr_orphans
));
2215 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
2216 PLURAL(nr_truncates
));
2218 /* Turn quotas off */
2219 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2220 if (sb_dqopt(sb
)->files
[i
])
2221 dquot_quota_off(sb
, i
);
2224 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
2228 * Maximal extent format file size.
2229 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2230 * extent format containers, within a sector_t, and within i_blocks
2231 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2232 * so that won't be a limiting factor.
2234 * However there is other limiting factor. We do store extents in the form
2235 * of starting block and length, hence the resulting length of the extent
2236 * covering maximum file size must fit into on-disk format containers as
2237 * well. Given that length is always by 1 unit bigger than max unit (because
2238 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2240 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2242 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
2245 loff_t upper_limit
= MAX_LFS_FILESIZE
;
2247 /* small i_blocks in vfs inode? */
2248 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2250 * CONFIG_LBDAF is not enabled implies the inode
2251 * i_block represent total blocks in 512 bytes
2252 * 32 == size of vfs inode i_blocks * 8
2254 upper_limit
= (1LL << 32) - 1;
2256 /* total blocks in file system block size */
2257 upper_limit
>>= (blkbits
- 9);
2258 upper_limit
<<= blkbits
;
2262 * 32-bit extent-start container, ee_block. We lower the maxbytes
2263 * by one fs block, so ee_len can cover the extent of maximum file
2266 res
= (1LL << 32) - 1;
2269 /* Sanity check against vm- & vfs- imposed limits */
2270 if (res
> upper_limit
)
2277 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2278 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2279 * We need to be 1 filesystem block less than the 2^48 sector limit.
2281 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2283 loff_t res
= EXT4_NDIR_BLOCKS
;
2286 /* This is calculated to be the largest file size for a dense, block
2287 * mapped file such that the file's total number of 512-byte sectors,
2288 * including data and all indirect blocks, does not exceed (2^48 - 1).
2290 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2291 * number of 512-byte sectors of the file.
2294 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2296 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2297 * the inode i_block field represents total file blocks in
2298 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2300 upper_limit
= (1LL << 32) - 1;
2302 /* total blocks in file system block size */
2303 upper_limit
>>= (bits
- 9);
2307 * We use 48 bit ext4_inode i_blocks
2308 * With EXT4_HUGE_FILE_FL set the i_blocks
2309 * represent total number of blocks in
2310 * file system block size
2312 upper_limit
= (1LL << 48) - 1;
2316 /* indirect blocks */
2318 /* double indirect blocks */
2319 meta_blocks
+= 1 + (1LL << (bits
-2));
2320 /* tripple indirect blocks */
2321 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2323 upper_limit
-= meta_blocks
;
2324 upper_limit
<<= bits
;
2326 res
+= 1LL << (bits
-2);
2327 res
+= 1LL << (2*(bits
-2));
2328 res
+= 1LL << (3*(bits
-2));
2330 if (res
> upper_limit
)
2333 if (res
> MAX_LFS_FILESIZE
)
2334 res
= MAX_LFS_FILESIZE
;
2339 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2340 ext4_fsblk_t logical_sb_block
, int nr
)
2342 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2343 ext4_group_t bg
, first_meta_bg
;
2346 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2348 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
2350 return logical_sb_block
+ nr
+ 1;
2351 bg
= sbi
->s_desc_per_block
* nr
;
2352 if (ext4_bg_has_super(sb
, bg
))
2355 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2359 * ext4_get_stripe_size: Get the stripe size.
2360 * @sbi: In memory super block info
2362 * If we have specified it via mount option, then
2363 * use the mount option value. If the value specified at mount time is
2364 * greater than the blocks per group use the super block value.
2365 * If the super block value is greater than blocks per group return 0.
2366 * Allocator needs it be less than blocks per group.
2369 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2371 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2372 unsigned long stripe_width
=
2373 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2376 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2377 ret
= sbi
->s_stripe
;
2378 else if (stripe_width
<= sbi
->s_blocks_per_group
)
2380 else if (stride
<= sbi
->s_blocks_per_group
)
2386 * If the stripe width is 1, this makes no sense and
2387 * we set it to 0 to turn off stripe handling code.
2398 struct attribute attr
;
2399 ssize_t (*show
)(struct ext4_attr
*, struct ext4_sb_info
*, char *);
2400 ssize_t (*store
)(struct ext4_attr
*, struct ext4_sb_info
*,
2401 const char *, size_t);
2405 static int parse_strtoul(const char *buf
,
2406 unsigned long max
, unsigned long *value
)
2410 *value
= simple_strtoul(skip_spaces(buf
), &endp
, 0);
2411 endp
= skip_spaces(endp
);
2412 if (*endp
|| *value
> max
)
2418 static ssize_t
delayed_allocation_blocks_show(struct ext4_attr
*a
,
2419 struct ext4_sb_info
*sbi
,
2422 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2424 percpu_counter_sum(&sbi
->s_dirtyclusters_counter
)));
2427 static ssize_t
session_write_kbytes_show(struct ext4_attr
*a
,
2428 struct ext4_sb_info
*sbi
, char *buf
)
2430 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2432 if (!sb
->s_bdev
->bd_part
)
2433 return snprintf(buf
, PAGE_SIZE
, "0\n");
2434 return snprintf(buf
, PAGE_SIZE
, "%lu\n",
2435 (part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2436 sbi
->s_sectors_written_start
) >> 1);
2439 static ssize_t
lifetime_write_kbytes_show(struct ext4_attr
*a
,
2440 struct ext4_sb_info
*sbi
, char *buf
)
2442 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2444 if (!sb
->s_bdev
->bd_part
)
2445 return snprintf(buf
, PAGE_SIZE
, "0\n");
2446 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2447 (unsigned long long)(sbi
->s_kbytes_written
+
2448 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2449 EXT4_SB(sb
)->s_sectors_written_start
) >> 1)));
2452 static ssize_t
inode_readahead_blks_store(struct ext4_attr
*a
,
2453 struct ext4_sb_info
*sbi
,
2454 const char *buf
, size_t count
)
2458 if (parse_strtoul(buf
, 0x40000000, &t
))
2461 if (t
&& !is_power_of_2(t
))
2464 sbi
->s_inode_readahead_blks
= t
;
2468 static ssize_t
sbi_ui_show(struct ext4_attr
*a
,
2469 struct ext4_sb_info
*sbi
, char *buf
)
2471 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2473 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
2476 static ssize_t
sbi_ui_store(struct ext4_attr
*a
,
2477 struct ext4_sb_info
*sbi
,
2478 const char *buf
, size_t count
)
2480 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2483 if (parse_strtoul(buf
, 0xffffffff, &t
))
2489 static ssize_t
trigger_test_error(struct ext4_attr
*a
,
2490 struct ext4_sb_info
*sbi
,
2491 const char *buf
, size_t count
)
2495 if (!capable(CAP_SYS_ADMIN
))
2498 if (len
&& buf
[len
-1] == '\n')
2502 ext4_error(sbi
->s_sb
, "%.*s", len
, buf
);
2506 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2507 static struct ext4_attr ext4_attr_##_name = { \
2508 .attr = {.name = __stringify(_name), .mode = _mode }, \
2511 .offset = offsetof(struct ext4_sb_info, _elname), \
2513 #define EXT4_ATTR(name, mode, show, store) \
2514 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2516 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2517 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2518 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2519 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2520 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2521 #define ATTR_LIST(name) &ext4_attr_##name.attr
2523 EXT4_RO_ATTR(delayed_allocation_blocks
);
2524 EXT4_RO_ATTR(session_write_kbytes
);
2525 EXT4_RO_ATTR(lifetime_write_kbytes
);
2526 EXT4_ATTR_OFFSET(inode_readahead_blks
, 0644, sbi_ui_show
,
2527 inode_readahead_blks_store
, s_inode_readahead_blks
);
2528 EXT4_RW_ATTR_SBI_UI(inode_goal
, s_inode_goal
);
2529 EXT4_RW_ATTR_SBI_UI(mb_stats
, s_mb_stats
);
2530 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan
, s_mb_max_to_scan
);
2531 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan
, s_mb_min_to_scan
);
2532 EXT4_RW_ATTR_SBI_UI(mb_order2_req
, s_mb_order2_reqs
);
2533 EXT4_RW_ATTR_SBI_UI(mb_stream_req
, s_mb_stream_request
);
2534 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc
, s_mb_group_prealloc
);
2535 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump
, s_max_writeback_mb_bump
);
2536 EXT4_ATTR(trigger_fs_error
, 0200, NULL
, trigger_test_error
);
2538 static struct attribute
*ext4_attrs
[] = {
2539 ATTR_LIST(delayed_allocation_blocks
),
2540 ATTR_LIST(session_write_kbytes
),
2541 ATTR_LIST(lifetime_write_kbytes
),
2542 ATTR_LIST(inode_readahead_blks
),
2543 ATTR_LIST(inode_goal
),
2544 ATTR_LIST(mb_stats
),
2545 ATTR_LIST(mb_max_to_scan
),
2546 ATTR_LIST(mb_min_to_scan
),
2547 ATTR_LIST(mb_order2_req
),
2548 ATTR_LIST(mb_stream_req
),
2549 ATTR_LIST(mb_group_prealloc
),
2550 ATTR_LIST(max_writeback_mb_bump
),
2551 ATTR_LIST(trigger_fs_error
),
2555 /* Features this copy of ext4 supports */
2556 EXT4_INFO_ATTR(lazy_itable_init
);
2557 EXT4_INFO_ATTR(batched_discard
);
2559 static struct attribute
*ext4_feat_attrs
[] = {
2560 ATTR_LIST(lazy_itable_init
),
2561 ATTR_LIST(batched_discard
),
2565 static ssize_t
ext4_attr_show(struct kobject
*kobj
,
2566 struct attribute
*attr
, char *buf
)
2568 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2570 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2572 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
2575 static ssize_t
ext4_attr_store(struct kobject
*kobj
,
2576 struct attribute
*attr
,
2577 const char *buf
, size_t len
)
2579 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2581 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2583 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
2586 static void ext4_sb_release(struct kobject
*kobj
)
2588 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2590 complete(&sbi
->s_kobj_unregister
);
2593 static const struct sysfs_ops ext4_attr_ops
= {
2594 .show
= ext4_attr_show
,
2595 .store
= ext4_attr_store
,
2598 static struct kobj_type ext4_ktype
= {
2599 .default_attrs
= ext4_attrs
,
2600 .sysfs_ops
= &ext4_attr_ops
,
2601 .release
= ext4_sb_release
,
2604 static void ext4_feat_release(struct kobject
*kobj
)
2606 complete(&ext4_feat
->f_kobj_unregister
);
2609 static struct kobj_type ext4_feat_ktype
= {
2610 .default_attrs
= ext4_feat_attrs
,
2611 .sysfs_ops
= &ext4_attr_ops
,
2612 .release
= ext4_feat_release
,
2616 * Check whether this filesystem can be mounted based on
2617 * the features present and the RDONLY/RDWR mount requested.
2618 * Returns 1 if this filesystem can be mounted as requested,
2619 * 0 if it cannot be.
2621 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2623 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
)) {
2624 ext4_msg(sb
, KERN_ERR
,
2625 "Couldn't mount because of "
2626 "unsupported optional features (%x)",
2627 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2628 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2635 /* Check that feature set is OK for a read-write mount */
2636 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
)) {
2637 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2638 "unsupported optional features (%x)",
2639 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2640 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2644 * Large file size enabled file system can only be mounted
2645 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2647 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
2648 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2649 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2650 "cannot be mounted RDWR without "
2655 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_BIGALLOC
) &&
2656 !EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_EXTENTS
)) {
2657 ext4_msg(sb
, KERN_ERR
,
2658 "Can't support bigalloc feature without "
2659 "extents feature\n");
2663 #ifndef CONFIG_QUOTA
2664 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
) &&
2666 ext4_msg(sb
, KERN_ERR
,
2667 "Filesystem with quota feature cannot be mounted RDWR "
2668 "without CONFIG_QUOTA");
2671 #endif /* CONFIG_QUOTA */
2676 * This function is called once a day if we have errors logged
2677 * on the file system
2679 static void print_daily_error_info(unsigned long arg
)
2681 struct super_block
*sb
= (struct super_block
*) arg
;
2682 struct ext4_sb_info
*sbi
;
2683 struct ext4_super_block
*es
;
2688 if (es
->s_error_count
)
2689 ext4_msg(sb
, KERN_NOTICE
, "error count: %u",
2690 le32_to_cpu(es
->s_error_count
));
2691 if (es
->s_first_error_time
) {
2692 printk(KERN_NOTICE
"EXT4-fs (%s): initial error at %u: %.*s:%d",
2693 sb
->s_id
, le32_to_cpu(es
->s_first_error_time
),
2694 (int) sizeof(es
->s_first_error_func
),
2695 es
->s_first_error_func
,
2696 le32_to_cpu(es
->s_first_error_line
));
2697 if (es
->s_first_error_ino
)
2698 printk(": inode %u",
2699 le32_to_cpu(es
->s_first_error_ino
));
2700 if (es
->s_first_error_block
)
2701 printk(": block %llu", (unsigned long long)
2702 le64_to_cpu(es
->s_first_error_block
));
2705 if (es
->s_last_error_time
) {
2706 printk(KERN_NOTICE
"EXT4-fs (%s): last error at %u: %.*s:%d",
2707 sb
->s_id
, le32_to_cpu(es
->s_last_error_time
),
2708 (int) sizeof(es
->s_last_error_func
),
2709 es
->s_last_error_func
,
2710 le32_to_cpu(es
->s_last_error_line
));
2711 if (es
->s_last_error_ino
)
2712 printk(": inode %u",
2713 le32_to_cpu(es
->s_last_error_ino
));
2714 if (es
->s_last_error_block
)
2715 printk(": block %llu", (unsigned long long)
2716 le64_to_cpu(es
->s_last_error_block
));
2719 mod_timer(&sbi
->s_err_report
, jiffies
+ 24*60*60*HZ
); /* Once a day */
2722 /* Find next suitable group and run ext4_init_inode_table */
2723 static int ext4_run_li_request(struct ext4_li_request
*elr
)
2725 struct ext4_group_desc
*gdp
= NULL
;
2726 ext4_group_t group
, ngroups
;
2727 struct super_block
*sb
;
2728 unsigned long timeout
= 0;
2732 ngroups
= EXT4_SB(sb
)->s_groups_count
;
2735 for (group
= elr
->lr_next_group
; group
< ngroups
; group
++) {
2736 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2742 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2746 if (group
== ngroups
)
2751 ret
= ext4_init_inode_table(sb
, group
,
2752 elr
->lr_timeout
? 0 : 1);
2753 if (elr
->lr_timeout
== 0) {
2754 timeout
= (jiffies
- timeout
) *
2755 elr
->lr_sbi
->s_li_wait_mult
;
2756 elr
->lr_timeout
= timeout
;
2758 elr
->lr_next_sched
= jiffies
+ elr
->lr_timeout
;
2759 elr
->lr_next_group
= group
+ 1;
2767 * Remove lr_request from the list_request and free the
2768 * request structure. Should be called with li_list_mtx held
2770 static void ext4_remove_li_request(struct ext4_li_request
*elr
)
2772 struct ext4_sb_info
*sbi
;
2779 list_del(&elr
->lr_request
);
2780 sbi
->s_li_request
= NULL
;
2784 static void ext4_unregister_li_request(struct super_block
*sb
)
2786 mutex_lock(&ext4_li_mtx
);
2787 if (!ext4_li_info
) {
2788 mutex_unlock(&ext4_li_mtx
);
2792 mutex_lock(&ext4_li_info
->li_list_mtx
);
2793 ext4_remove_li_request(EXT4_SB(sb
)->s_li_request
);
2794 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2795 mutex_unlock(&ext4_li_mtx
);
2798 static struct task_struct
*ext4_lazyinit_task
;
2801 * This is the function where ext4lazyinit thread lives. It walks
2802 * through the request list searching for next scheduled filesystem.
2803 * When such a fs is found, run the lazy initialization request
2804 * (ext4_rn_li_request) and keep track of the time spend in this
2805 * function. Based on that time we compute next schedule time of
2806 * the request. When walking through the list is complete, compute
2807 * next waking time and put itself into sleep.
2809 static int ext4_lazyinit_thread(void *arg
)
2811 struct ext4_lazy_init
*eli
= (struct ext4_lazy_init
*)arg
;
2812 struct list_head
*pos
, *n
;
2813 struct ext4_li_request
*elr
;
2814 unsigned long next_wakeup
, cur
;
2816 BUG_ON(NULL
== eli
);
2820 next_wakeup
= MAX_JIFFY_OFFSET
;
2822 mutex_lock(&eli
->li_list_mtx
);
2823 if (list_empty(&eli
->li_request_list
)) {
2824 mutex_unlock(&eli
->li_list_mtx
);
2828 list_for_each_safe(pos
, n
, &eli
->li_request_list
) {
2829 elr
= list_entry(pos
, struct ext4_li_request
,
2832 if (time_after_eq(jiffies
, elr
->lr_next_sched
)) {
2833 if (ext4_run_li_request(elr
) != 0) {
2834 /* error, remove the lazy_init job */
2835 ext4_remove_li_request(elr
);
2840 if (time_before(elr
->lr_next_sched
, next_wakeup
))
2841 next_wakeup
= elr
->lr_next_sched
;
2843 mutex_unlock(&eli
->li_list_mtx
);
2848 if ((time_after_eq(cur
, next_wakeup
)) ||
2849 (MAX_JIFFY_OFFSET
== next_wakeup
)) {
2854 schedule_timeout_interruptible(next_wakeup
- cur
);
2856 if (kthread_should_stop()) {
2857 ext4_clear_request_list();
2864 * It looks like the request list is empty, but we need
2865 * to check it under the li_list_mtx lock, to prevent any
2866 * additions into it, and of course we should lock ext4_li_mtx
2867 * to atomically free the list and ext4_li_info, because at
2868 * this point another ext4 filesystem could be registering
2871 mutex_lock(&ext4_li_mtx
);
2872 mutex_lock(&eli
->li_list_mtx
);
2873 if (!list_empty(&eli
->li_request_list
)) {
2874 mutex_unlock(&eli
->li_list_mtx
);
2875 mutex_unlock(&ext4_li_mtx
);
2878 mutex_unlock(&eli
->li_list_mtx
);
2879 kfree(ext4_li_info
);
2880 ext4_li_info
= NULL
;
2881 mutex_unlock(&ext4_li_mtx
);
2886 static void ext4_clear_request_list(void)
2888 struct list_head
*pos
, *n
;
2889 struct ext4_li_request
*elr
;
2891 mutex_lock(&ext4_li_info
->li_list_mtx
);
2892 list_for_each_safe(pos
, n
, &ext4_li_info
->li_request_list
) {
2893 elr
= list_entry(pos
, struct ext4_li_request
,
2895 ext4_remove_li_request(elr
);
2897 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2900 static int ext4_run_lazyinit_thread(void)
2902 ext4_lazyinit_task
= kthread_run(ext4_lazyinit_thread
,
2903 ext4_li_info
, "ext4lazyinit");
2904 if (IS_ERR(ext4_lazyinit_task
)) {
2905 int err
= PTR_ERR(ext4_lazyinit_task
);
2906 ext4_clear_request_list();
2907 kfree(ext4_li_info
);
2908 ext4_li_info
= NULL
;
2909 printk(KERN_CRIT
"EXT4-fs: error %d creating inode table "
2910 "initialization thread\n",
2914 ext4_li_info
->li_state
|= EXT4_LAZYINIT_RUNNING
;
2919 * Check whether it make sense to run itable init. thread or not.
2920 * If there is at least one uninitialized inode table, return
2921 * corresponding group number, else the loop goes through all
2922 * groups and return total number of groups.
2924 static ext4_group_t
ext4_has_uninit_itable(struct super_block
*sb
)
2926 ext4_group_t group
, ngroups
= EXT4_SB(sb
)->s_groups_count
;
2927 struct ext4_group_desc
*gdp
= NULL
;
2929 for (group
= 0; group
< ngroups
; group
++) {
2930 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2934 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2941 static int ext4_li_info_new(void)
2943 struct ext4_lazy_init
*eli
= NULL
;
2945 eli
= kzalloc(sizeof(*eli
), GFP_KERNEL
);
2949 INIT_LIST_HEAD(&eli
->li_request_list
);
2950 mutex_init(&eli
->li_list_mtx
);
2952 eli
->li_state
|= EXT4_LAZYINIT_QUIT
;
2959 static struct ext4_li_request
*ext4_li_request_new(struct super_block
*sb
,
2962 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2963 struct ext4_li_request
*elr
;
2966 elr
= kzalloc(sizeof(*elr
), GFP_KERNEL
);
2972 elr
->lr_next_group
= start
;
2975 * Randomize first schedule time of the request to
2976 * spread the inode table initialization requests
2979 get_random_bytes(&rnd
, sizeof(rnd
));
2980 elr
->lr_next_sched
= jiffies
+ (unsigned long)rnd
%
2981 (EXT4_DEF_LI_MAX_START_DELAY
* HZ
);
2986 static int ext4_register_li_request(struct super_block
*sb
,
2987 ext4_group_t first_not_zeroed
)
2989 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2990 struct ext4_li_request
*elr
;
2991 ext4_group_t ngroups
= EXT4_SB(sb
)->s_groups_count
;
2994 if (sbi
->s_li_request
!= NULL
) {
2996 * Reset timeout so it can be computed again, because
2997 * s_li_wait_mult might have changed.
2999 sbi
->s_li_request
->lr_timeout
= 0;
3003 if (first_not_zeroed
== ngroups
||
3004 (sb
->s_flags
& MS_RDONLY
) ||
3005 !test_opt(sb
, INIT_INODE_TABLE
))
3008 elr
= ext4_li_request_new(sb
, first_not_zeroed
);
3012 mutex_lock(&ext4_li_mtx
);
3014 if (NULL
== ext4_li_info
) {
3015 ret
= ext4_li_info_new();
3020 mutex_lock(&ext4_li_info
->li_list_mtx
);
3021 list_add(&elr
->lr_request
, &ext4_li_info
->li_request_list
);
3022 mutex_unlock(&ext4_li_info
->li_list_mtx
);
3024 sbi
->s_li_request
= elr
;
3026 * set elr to NULL here since it has been inserted to
3027 * the request_list and the removal and free of it is
3028 * handled by ext4_clear_request_list from now on.
3032 if (!(ext4_li_info
->li_state
& EXT4_LAZYINIT_RUNNING
)) {
3033 ret
= ext4_run_lazyinit_thread();
3038 mutex_unlock(&ext4_li_mtx
);
3045 * We do not need to lock anything since this is called on
3048 static void ext4_destroy_lazyinit_thread(void)
3051 * If thread exited earlier
3052 * there's nothing to be done.
3054 if (!ext4_li_info
|| !ext4_lazyinit_task
)
3057 kthread_stop(ext4_lazyinit_task
);
3060 static int set_journal_csum_feature_set(struct super_block
*sb
)
3063 int compat
, incompat
;
3064 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3066 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3067 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
)) {
3068 /* journal checksum v2 */
3070 incompat
= JBD2_FEATURE_INCOMPAT_CSUM_V2
;
3072 /* journal checksum v1 */
3073 compat
= JBD2_FEATURE_COMPAT_CHECKSUM
;
3077 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
3078 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3080 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
|
3082 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
3083 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3086 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3087 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3089 jbd2_journal_clear_features(sbi
->s_journal
,
3090 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
3091 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
|
3092 JBD2_FEATURE_INCOMPAT_CSUM_V2
);
3099 * Note: calculating the overhead so we can be compatible with
3100 * historical BSD practice is quite difficult in the face of
3101 * clusters/bigalloc. This is because multiple metadata blocks from
3102 * different block group can end up in the same allocation cluster.
3103 * Calculating the exact overhead in the face of clustered allocation
3104 * requires either O(all block bitmaps) in memory or O(number of block
3105 * groups**2) in time. We will still calculate the superblock for
3106 * older file systems --- and if we come across with a bigalloc file
3107 * system with zero in s_overhead_clusters the estimate will be close to
3108 * correct especially for very large cluster sizes --- but for newer
3109 * file systems, it's better to calculate this figure once at mkfs
3110 * time, and store it in the superblock. If the superblock value is
3111 * present (even for non-bigalloc file systems), we will use it.
3113 static int count_overhead(struct super_block
*sb
, ext4_group_t grp
,
3116 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3117 struct ext4_group_desc
*gdp
;
3118 ext4_fsblk_t first_block
, last_block
, b
;
3119 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3120 int s
, j
, count
= 0;
3122 first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
) +
3123 (grp
* EXT4_BLOCKS_PER_GROUP(sb
));
3124 last_block
= first_block
+ EXT4_BLOCKS_PER_GROUP(sb
) - 1;
3125 for (i
= 0; i
< ngroups
; i
++) {
3126 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
3127 b
= ext4_block_bitmap(sb
, gdp
);
3128 if (b
>= first_block
&& b
<= last_block
) {
3129 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3132 b
= ext4_inode_bitmap(sb
, gdp
);
3133 if (b
>= first_block
&& b
<= last_block
) {
3134 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3137 b
= ext4_inode_table(sb
, gdp
);
3138 if (b
>= first_block
&& b
+ sbi
->s_itb_per_group
<= last_block
)
3139 for (j
= 0; j
< sbi
->s_itb_per_group
; j
++, b
++) {
3140 int c
= EXT4_B2C(sbi
, b
- first_block
);
3141 ext4_set_bit(c
, buf
);
3147 if (ext4_bg_has_super(sb
, grp
)) {
3148 ext4_set_bit(s
++, buf
);
3151 for (j
= ext4_bg_num_gdb(sb
, grp
); j
> 0; j
--) {
3152 ext4_set_bit(EXT4_B2C(sbi
, s
++), buf
);
3158 return EXT4_CLUSTERS_PER_GROUP(sb
) -
3159 ext4_count_free(buf
, EXT4_CLUSTERS_PER_GROUP(sb
) / 8);
3163 * Compute the overhead and stash it in sbi->s_overhead
3165 int ext4_calculate_overhead(struct super_block
*sb
)
3167 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3168 struct ext4_super_block
*es
= sbi
->s_es
;
3169 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3170 ext4_fsblk_t overhead
= 0;
3171 char *buf
= (char *) get_zeroed_page(GFP_KERNEL
);
3173 memset(buf
, 0, PAGE_SIZE
);
3178 * Compute the overhead (FS structures). This is constant
3179 * for a given filesystem unless the number of block groups
3180 * changes so we cache the previous value until it does.
3184 * All of the blocks before first_data_block are overhead
3186 overhead
= EXT4_B2C(sbi
, le32_to_cpu(es
->s_first_data_block
));
3189 * Add the overhead found in each block group
3191 for (i
= 0; i
< ngroups
; i
++) {
3194 blks
= count_overhead(sb
, i
, buf
);
3197 memset(buf
, 0, PAGE_SIZE
);
3200 sbi
->s_overhead
= overhead
;
3202 free_page((unsigned long) buf
);
3206 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
3208 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
3209 struct buffer_head
*bh
;
3210 struct ext4_super_block
*es
= NULL
;
3211 struct ext4_sb_info
*sbi
;
3213 ext4_fsblk_t sb_block
= get_sb_block(&data
);
3214 ext4_fsblk_t logical_sb_block
;
3215 unsigned long offset
= 0;
3216 unsigned long journal_devnum
= 0;
3217 unsigned long def_mount_opts
;
3222 int blocksize
, clustersize
;
3223 unsigned int db_count
;
3225 int needs_recovery
, has_huge_files
, has_bigalloc
;
3228 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3229 ext4_group_t first_not_zeroed
;
3231 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
3235 sbi
->s_blockgroup_lock
=
3236 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
3237 if (!sbi
->s_blockgroup_lock
) {
3241 sb
->s_fs_info
= sbi
;
3243 sbi
->s_mount_opt
= 0;
3244 sbi
->s_resuid
= make_kuid(&init_user_ns
, EXT4_DEF_RESUID
);
3245 sbi
->s_resgid
= make_kgid(&init_user_ns
, EXT4_DEF_RESGID
);
3246 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
3247 sbi
->s_sb_block
= sb_block
;
3248 if (sb
->s_bdev
->bd_part
)
3249 sbi
->s_sectors_written_start
=
3250 part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]);
3252 /* Cleanup superblock name */
3253 for (cp
= sb
->s_id
; (cp
= strchr(cp
, '/'));)
3257 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
3259 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
3264 * The ext4 superblock will not be buffer aligned for other than 1kB
3265 * block sizes. We need to calculate the offset from buffer start.
3267 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
3268 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3269 offset
= do_div(logical_sb_block
, blocksize
);
3271 logical_sb_block
= sb_block
;
3274 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
3275 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
3279 * Note: s_es must be initialized as soon as possible because
3280 * some ext4 macro-instructions depend on its value
3282 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
3284 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
3285 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
3287 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
3289 /* Warn if metadata_csum and gdt_csum are both set. */
3290 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3291 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
) &&
3292 EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_GDT_CSUM
))
3293 ext4_warning(sb
, KERN_INFO
"metadata_csum and uninit_bg are "
3294 "redundant flags; please run fsck.");
3296 /* Check for a known checksum algorithm */
3297 if (!ext4_verify_csum_type(sb
, es
)) {
3298 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3299 "unknown checksum algorithm.");
3304 /* Load the checksum driver */
3305 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3306 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
)) {
3307 sbi
->s_chksum_driver
= crypto_alloc_shash("crc32c", 0, 0);
3308 if (IS_ERR(sbi
->s_chksum_driver
)) {
3309 ext4_msg(sb
, KERN_ERR
, "Cannot load crc32c driver.");
3310 ret
= PTR_ERR(sbi
->s_chksum_driver
);
3311 sbi
->s_chksum_driver
= NULL
;
3316 /* Check superblock checksum */
3317 if (!ext4_superblock_csum_verify(sb
, es
)) {
3318 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3319 "invalid superblock checksum. Run e2fsck?");
3324 /* Precompute checksum seed for all metadata */
3325 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3326 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))
3327 sbi
->s_csum_seed
= ext4_chksum(sbi
, ~0, es
->s_uuid
,
3328 sizeof(es
->s_uuid
));
3330 /* Set defaults before we parse the mount options */
3331 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
3332 set_opt(sb
, INIT_INODE_TABLE
);
3333 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
3335 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
3337 if (def_mount_opts
& EXT4_DEFM_UID16
)
3338 set_opt(sb
, NO_UID32
);
3339 /* xattr user namespace & acls are now defaulted on */
3340 #ifdef CONFIG_EXT4_FS_XATTR
3341 set_opt(sb
, XATTR_USER
);
3343 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3344 set_opt(sb
, POSIX_ACL
);
3346 set_opt(sb
, MBLK_IO_SUBMIT
);
3347 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
3348 set_opt(sb
, JOURNAL_DATA
);
3349 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
3350 set_opt(sb
, ORDERED_DATA
);
3351 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
3352 set_opt(sb
, WRITEBACK_DATA
);
3354 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
3355 set_opt(sb
, ERRORS_PANIC
);
3356 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
3357 set_opt(sb
, ERRORS_CONT
);
3359 set_opt(sb
, ERRORS_RO
);
3360 if (def_mount_opts
& EXT4_DEFM_BLOCK_VALIDITY
)
3361 set_opt(sb
, BLOCK_VALIDITY
);
3362 if (def_mount_opts
& EXT4_DEFM_DISCARD
)
3363 set_opt(sb
, DISCARD
);
3365 sbi
->s_resuid
= make_kuid(&init_user_ns
, le16_to_cpu(es
->s_def_resuid
));
3366 sbi
->s_resgid
= make_kgid(&init_user_ns
, le16_to_cpu(es
->s_def_resgid
));
3367 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
3368 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
3369 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
3371 if ((def_mount_opts
& EXT4_DEFM_NOBARRIER
) == 0)
3372 set_opt(sb
, BARRIER
);
3375 * enable delayed allocation by default
3376 * Use -o nodelalloc to turn it off
3378 if (!IS_EXT3_SB(sb
) &&
3379 ((def_mount_opts
& EXT4_DEFM_NODELALLOC
) == 0))
3380 set_opt(sb
, DELALLOC
);
3383 * set default s_li_wait_mult for lazyinit, for the case there is
3384 * no mount option specified.
3386 sbi
->s_li_wait_mult
= EXT4_DEF_LI_WAIT_MULT
;
3388 if (!parse_options((char *) sbi
->s_es
->s_mount_opts
, sb
,
3389 &journal_devnum
, &journal_ioprio
, 0)) {
3390 ext4_msg(sb
, KERN_WARNING
,
3391 "failed to parse options in superblock: %s",
3392 sbi
->s_es
->s_mount_opts
);
3394 sbi
->s_def_mount_opt
= sbi
->s_mount_opt
;
3395 if (!parse_options((char *) data
, sb
, &journal_devnum
,
3396 &journal_ioprio
, 0))
3399 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
3400 printk_once(KERN_WARNING
"EXT4-fs: Warning: mounting "
3401 "with data=journal disables delayed "
3402 "allocation and O_DIRECT support!\n");
3403 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
3404 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3405 "both data=journal and delalloc");
3408 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
3409 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3410 "both data=journal and delalloc");
3413 if (test_opt(sb
, DELALLOC
))
3414 clear_opt(sb
, DELALLOC
);
3417 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
3418 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
3419 if (blocksize
< PAGE_SIZE
) {
3420 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3421 "dioread_nolock if block size != PAGE_SIZE");
3426 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3427 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
3429 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
3430 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
3431 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
3432 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
3433 ext4_msg(sb
, KERN_WARNING
,
3434 "feature flags set on rev 0 fs, "
3435 "running e2fsck is recommended");
3437 if (IS_EXT2_SB(sb
)) {
3438 if (ext2_feature_set_ok(sb
))
3439 ext4_msg(sb
, KERN_INFO
, "mounting ext2 file system "
3440 "using the ext4 subsystem");
3442 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext2 due "
3443 "to feature incompatibilities");
3448 if (IS_EXT3_SB(sb
)) {
3449 if (ext3_feature_set_ok(sb
))
3450 ext4_msg(sb
, KERN_INFO
, "mounting ext3 file system "
3451 "using the ext4 subsystem");
3453 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext3 due "
3454 "to feature incompatibilities");
3460 * Check feature flags regardless of the revision level, since we
3461 * previously didn't change the revision level when setting the flags,
3462 * so there is a chance incompat flags are set on a rev 0 filesystem.
3464 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
3467 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
3468 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
3469 ext4_msg(sb
, KERN_ERR
,
3470 "Unsupported filesystem blocksize %d", blocksize
);
3474 if (sb
->s_blocksize
!= blocksize
) {
3475 /* Validate the filesystem blocksize */
3476 if (!sb_set_blocksize(sb
, blocksize
)) {
3477 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
3483 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3484 offset
= do_div(logical_sb_block
, blocksize
);
3485 bh
= sb_bread(sb
, logical_sb_block
);
3487 ext4_msg(sb
, KERN_ERR
,
3488 "Can't read superblock on 2nd try");
3491 es
= (struct ext4_super_block
*)(bh
->b_data
+ offset
);
3493 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
3494 ext4_msg(sb
, KERN_ERR
,
3495 "Magic mismatch, very weird!");
3500 has_huge_files
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3501 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
);
3502 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
3504 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
3506 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
3507 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
3508 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
3510 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
3511 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
3512 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
3513 (!is_power_of_2(sbi
->s_inode_size
)) ||
3514 (sbi
->s_inode_size
> blocksize
)) {
3515 ext4_msg(sb
, KERN_ERR
,
3516 "unsupported inode size: %d",
3520 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
3521 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
3524 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
3525 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
3526 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
3527 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
3528 !is_power_of_2(sbi
->s_desc_size
)) {
3529 ext4_msg(sb
, KERN_ERR
,
3530 "unsupported descriptor size %lu",
3535 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
3537 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
3538 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
3539 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
3542 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
3543 if (sbi
->s_inodes_per_block
== 0)
3545 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
3546 sbi
->s_inodes_per_block
;
3547 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
3549 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3550 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
3551 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
3553 for (i
= 0; i
< 4; i
++)
3554 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
3555 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
3556 i
= le32_to_cpu(es
->s_flags
);
3557 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
3558 sbi
->s_hash_unsigned
= 3;
3559 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
3560 #ifdef __CHAR_UNSIGNED__
3561 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
3562 sbi
->s_hash_unsigned
= 3;
3564 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
3568 /* Handle clustersize */
3569 clustersize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_cluster_size
);
3570 has_bigalloc
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3571 EXT4_FEATURE_RO_COMPAT_BIGALLOC
);
3573 if (clustersize
< blocksize
) {
3574 ext4_msg(sb
, KERN_ERR
,
3575 "cluster size (%d) smaller than "
3576 "block size (%d)", clustersize
, blocksize
);
3579 sbi
->s_cluster_bits
= le32_to_cpu(es
->s_log_cluster_size
) -
3580 le32_to_cpu(es
->s_log_block_size
);
3581 sbi
->s_clusters_per_group
=
3582 le32_to_cpu(es
->s_clusters_per_group
);
3583 if (sbi
->s_clusters_per_group
> blocksize
* 8) {
3584 ext4_msg(sb
, KERN_ERR
,
3585 "#clusters per group too big: %lu",
3586 sbi
->s_clusters_per_group
);
3589 if (sbi
->s_blocks_per_group
!=
3590 (sbi
->s_clusters_per_group
* (clustersize
/ blocksize
))) {
3591 ext4_msg(sb
, KERN_ERR
, "blocks per group (%lu) and "
3592 "clusters per group (%lu) inconsistent",
3593 sbi
->s_blocks_per_group
,
3594 sbi
->s_clusters_per_group
);
3598 if (clustersize
!= blocksize
) {
3599 ext4_warning(sb
, "fragment/cluster size (%d) != "
3600 "block size (%d)", clustersize
,
3602 clustersize
= blocksize
;
3604 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
3605 ext4_msg(sb
, KERN_ERR
,
3606 "#blocks per group too big: %lu",
3607 sbi
->s_blocks_per_group
);
3610 sbi
->s_clusters_per_group
= sbi
->s_blocks_per_group
;
3611 sbi
->s_cluster_bits
= 0;
3613 sbi
->s_cluster_ratio
= clustersize
/ blocksize
;
3615 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
3616 ext4_msg(sb
, KERN_ERR
,
3617 "#inodes per group too big: %lu",
3618 sbi
->s_inodes_per_group
);
3623 * Test whether we have more sectors than will fit in sector_t,
3624 * and whether the max offset is addressable by the page cache.
3626 err
= generic_check_addressable(sb
->s_blocksize_bits
,
3627 ext4_blocks_count(es
));
3629 ext4_msg(sb
, KERN_ERR
, "filesystem"
3630 " too large to mount safely on this system");
3631 if (sizeof(sector_t
) < 8)
3632 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
3637 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
3640 /* check blocks count against device size */
3641 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
3642 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
3643 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
3644 "exceeds size of device (%llu blocks)",
3645 ext4_blocks_count(es
), blocks_count
);
3650 * It makes no sense for the first data block to be beyond the end
3651 * of the filesystem.
3653 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
3654 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data "
3655 "block %u is beyond end of filesystem (%llu)",
3656 le32_to_cpu(es
->s_first_data_block
),
3657 ext4_blocks_count(es
));
3660 blocks_count
= (ext4_blocks_count(es
) -
3661 le32_to_cpu(es
->s_first_data_block
) +
3662 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
3663 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
3664 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
3665 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
3666 "(block count %llu, first data block %u, "
3667 "blocks per group %lu)", sbi
->s_groups_count
,
3668 ext4_blocks_count(es
),
3669 le32_to_cpu(es
->s_first_data_block
),
3670 EXT4_BLOCKS_PER_GROUP(sb
));
3673 sbi
->s_groups_count
= blocks_count
;
3674 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
3675 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
3676 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
3677 EXT4_DESC_PER_BLOCK(sb
);
3678 sbi
->s_group_desc
= ext4_kvmalloc(db_count
*
3679 sizeof(struct buffer_head
*),
3681 if (sbi
->s_group_desc
== NULL
) {
3682 ext4_msg(sb
, KERN_ERR
, "not enough memory");
3688 sbi
->s_proc
= proc_mkdir(sb
->s_id
, ext4_proc_root
);
3691 proc_create_data("options", S_IRUGO
, sbi
->s_proc
,
3692 &ext4_seq_options_fops
, sb
);
3694 bgl_lock_init(sbi
->s_blockgroup_lock
);
3696 for (i
= 0; i
< db_count
; i
++) {
3697 block
= descriptor_loc(sb
, logical_sb_block
, i
);
3698 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
3699 if (!sbi
->s_group_desc
[i
]) {
3700 ext4_msg(sb
, KERN_ERR
,
3701 "can't read group descriptor %d", i
);
3706 if (!ext4_check_descriptors(sb
, &first_not_zeroed
)) {
3707 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
3710 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
3711 if (!ext4_fill_flex_info(sb
)) {
3712 ext4_msg(sb
, KERN_ERR
,
3713 "unable to initialize "
3714 "flex_bg meta info!");
3718 sbi
->s_gdb_count
= db_count
;
3719 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
3720 spin_lock_init(&sbi
->s_next_gen_lock
);
3722 init_timer(&sbi
->s_err_report
);
3723 sbi
->s_err_report
.function
= print_daily_error_info
;
3724 sbi
->s_err_report
.data
= (unsigned long) sb
;
3726 err
= percpu_counter_init(&sbi
->s_freeclusters_counter
,
3727 ext4_count_free_clusters(sb
));
3729 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
3730 ext4_count_free_inodes(sb
));
3733 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
3734 ext4_count_dirs(sb
));
3737 err
= percpu_counter_init(&sbi
->s_dirtyclusters_counter
, 0);
3740 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
3745 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
3746 sbi
->s_max_writeback_mb_bump
= 128;
3749 * set up enough so that it can read an inode
3751 if (!test_opt(sb
, NOLOAD
) &&
3752 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
3753 sb
->s_op
= &ext4_sops
;
3755 sb
->s_op
= &ext4_nojournal_sops
;
3756 sb
->s_export_op
= &ext4_export_ops
;
3757 sb
->s_xattr
= ext4_xattr_handlers
;
3759 sb
->s_qcop
= &ext4_qctl_operations
;
3760 sb
->dq_op
= &ext4_quota_operations
;
3762 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
)) {
3763 /* Use qctl operations for hidden quota files. */
3764 sb
->s_qcop
= &ext4_qctl_sysfile_operations
;
3767 memcpy(sb
->s_uuid
, es
->s_uuid
, sizeof(es
->s_uuid
));
3769 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
3770 mutex_init(&sbi
->s_orphan_lock
);
3771 sbi
->s_resize_flags
= 0;
3775 needs_recovery
= (es
->s_last_orphan
!= 0 ||
3776 EXT4_HAS_INCOMPAT_FEATURE(sb
,
3777 EXT4_FEATURE_INCOMPAT_RECOVER
));
3779 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_MMP
) &&
3780 !(sb
->s_flags
& MS_RDONLY
))
3781 if (ext4_multi_mount_protect(sb
, le64_to_cpu(es
->s_mmp_block
)))
3785 * The first inode we look at is the journal inode. Don't try
3786 * root first: it may be modified in the journal!
3788 if (!test_opt(sb
, NOLOAD
) &&
3789 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
3790 if (ext4_load_journal(sb
, es
, journal_devnum
))
3792 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
3793 EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3794 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
3795 "suppressed and not mounted read-only");
3796 goto failed_mount_wq
;
3798 clear_opt(sb
, DATA_FLAGS
);
3799 sbi
->s_journal
= NULL
;
3804 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
) &&
3805 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
3806 JBD2_FEATURE_INCOMPAT_64BIT
)) {
3807 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
3808 goto failed_mount_wq
;
3811 if (!set_journal_csum_feature_set(sb
)) {
3812 ext4_msg(sb
, KERN_ERR
, "Failed to set journal checksum "
3814 goto failed_mount_wq
;
3817 /* We have now updated the journal if required, so we can
3818 * validate the data journaling mode. */
3819 switch (test_opt(sb
, DATA_FLAGS
)) {
3821 /* No mode set, assume a default based on the journal
3822 * capabilities: ORDERED_DATA if the journal can
3823 * cope, else JOURNAL_DATA
3825 if (jbd2_journal_check_available_features
3826 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
3827 set_opt(sb
, ORDERED_DATA
);
3829 set_opt(sb
, JOURNAL_DATA
);
3832 case EXT4_MOUNT_ORDERED_DATA
:
3833 case EXT4_MOUNT_WRITEBACK_DATA
:
3834 if (!jbd2_journal_check_available_features
3835 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
3836 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
3837 "requested data journaling mode");
3838 goto failed_mount_wq
;
3843 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
3845 sbi
->s_journal
->j_commit_callback
= ext4_journal_commit_callback
;
3848 * The journal may have updated the bg summary counts, so we
3849 * need to update the global counters.
3851 percpu_counter_set(&sbi
->s_freeclusters_counter
,
3852 ext4_count_free_clusters(sb
));
3853 percpu_counter_set(&sbi
->s_freeinodes_counter
,
3854 ext4_count_free_inodes(sb
));
3855 percpu_counter_set(&sbi
->s_dirs_counter
,
3856 ext4_count_dirs(sb
));
3857 percpu_counter_set(&sbi
->s_dirtyclusters_counter
, 0);
3861 * Get the # of file system overhead blocks from the
3862 * superblock if present.
3864 if (es
->s_overhead_clusters
)
3865 sbi
->s_overhead
= le32_to_cpu(es
->s_overhead_clusters
);
3867 ret
= ext4_calculate_overhead(sb
);
3869 goto failed_mount_wq
;
3873 * The maximum number of concurrent works can be high and
3874 * concurrency isn't really necessary. Limit it to 1.
3876 EXT4_SB(sb
)->dio_unwritten_wq
=
3877 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM
| WQ_UNBOUND
, 1);
3878 if (!EXT4_SB(sb
)->dio_unwritten_wq
) {
3879 printk(KERN_ERR
"EXT4-fs: failed to create DIO workqueue\n");
3880 goto failed_mount_wq
;
3884 * The jbd2_journal_load will have done any necessary log recovery,
3885 * so we can safely mount the rest of the filesystem now.
3888 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
3890 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
3891 ret
= PTR_ERR(root
);
3895 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
3896 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
3900 sb
->s_root
= d_make_root(root
);
3902 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
3907 if (ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
))
3908 sb
->s_flags
|= MS_RDONLY
;
3910 /* determine the minimum size of new large inodes, if present */
3911 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
3912 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
3913 EXT4_GOOD_OLD_INODE_SIZE
;
3914 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3915 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
3916 if (sbi
->s_want_extra_isize
<
3917 le16_to_cpu(es
->s_want_extra_isize
))
3918 sbi
->s_want_extra_isize
=
3919 le16_to_cpu(es
->s_want_extra_isize
);
3920 if (sbi
->s_want_extra_isize
<
3921 le16_to_cpu(es
->s_min_extra_isize
))
3922 sbi
->s_want_extra_isize
=
3923 le16_to_cpu(es
->s_min_extra_isize
);
3926 /* Check if enough inode space is available */
3927 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
3928 sbi
->s_inode_size
) {
3929 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
3930 EXT4_GOOD_OLD_INODE_SIZE
;
3931 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
3935 err
= ext4_setup_system_zone(sb
);
3937 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
3939 goto failed_mount4a
;
3943 err
= ext4_mb_init(sb
);
3945 ext4_msg(sb
, KERN_ERR
, "failed to initialize mballoc (%d)",
3950 err
= ext4_register_li_request(sb
, first_not_zeroed
);
3954 sbi
->s_kobj
.kset
= ext4_kset
;
3955 init_completion(&sbi
->s_kobj_unregister
);
3956 err
= kobject_init_and_add(&sbi
->s_kobj
, &ext4_ktype
, NULL
,
3961 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
3962 ext4_orphan_cleanup(sb
, es
);
3963 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
3964 if (needs_recovery
) {
3965 ext4_msg(sb
, KERN_INFO
, "recovery complete");
3966 ext4_mark_recovery_complete(sb
, es
);
3968 if (EXT4_SB(sb
)->s_journal
) {
3969 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
3970 descr
= " journalled data mode";
3971 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
3972 descr
= " ordered data mode";
3974 descr
= " writeback data mode";
3976 descr
= "out journal";
3979 /* Enable quota usage during mount. */
3980 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
) &&
3981 !(sb
->s_flags
& MS_RDONLY
)) {
3982 ret
= ext4_enable_quotas(sb
);
3986 #endif /* CONFIG_QUOTA */
3988 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s. "
3989 "Opts: %s%s%s", descr
, sbi
->s_es
->s_mount_opts
,
3990 *sbi
->s_es
->s_mount_opts
? "; " : "", orig_data
);
3992 if (es
->s_error_count
)
3993 mod_timer(&sbi
->s_err_report
, jiffies
+ 300*HZ
); /* 5 minutes */
4000 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
4004 ext4_unregister_li_request(sb
);
4006 ext4_mb_release(sb
);
4008 ext4_ext_release(sb
);
4009 ext4_release_system_zone(sb
);
4014 ext4_msg(sb
, KERN_ERR
, "mount failed");
4015 destroy_workqueue(EXT4_SB(sb
)->dio_unwritten_wq
);
4017 if (sbi
->s_journal
) {
4018 jbd2_journal_destroy(sbi
->s_journal
);
4019 sbi
->s_journal
= NULL
;
4022 del_timer(&sbi
->s_err_report
);
4023 if (sbi
->s_flex_groups
)
4024 ext4_kvfree(sbi
->s_flex_groups
);
4025 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
4026 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
4027 percpu_counter_destroy(&sbi
->s_dirs_counter
);
4028 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
4030 kthread_stop(sbi
->s_mmp_tsk
);
4032 for (i
= 0; i
< db_count
; i
++)
4033 brelse(sbi
->s_group_desc
[i
]);
4034 ext4_kvfree(sbi
->s_group_desc
);
4036 if (sbi
->s_chksum_driver
)
4037 crypto_free_shash(sbi
->s_chksum_driver
);
4039 remove_proc_entry("options", sbi
->s_proc
);
4040 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
4043 for (i
= 0; i
< MAXQUOTAS
; i
++)
4044 kfree(sbi
->s_qf_names
[i
]);
4046 ext4_blkdev_remove(sbi
);
4049 sb
->s_fs_info
= NULL
;
4050 kfree(sbi
->s_blockgroup_lock
);
4058 * Setup any per-fs journal parameters now. We'll do this both on
4059 * initial mount, once the journal has been initialised but before we've
4060 * done any recovery; and again on any subsequent remount.
4062 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
4064 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4066 journal
->j_commit_interval
= sbi
->s_commit_interval
;
4067 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
4068 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
4070 write_lock(&journal
->j_state_lock
);
4071 if (test_opt(sb
, BARRIER
))
4072 journal
->j_flags
|= JBD2_BARRIER
;
4074 journal
->j_flags
&= ~JBD2_BARRIER
;
4075 if (test_opt(sb
, DATA_ERR_ABORT
))
4076 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
4078 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
4079 write_unlock(&journal
->j_state_lock
);
4082 static journal_t
*ext4_get_journal(struct super_block
*sb
,
4083 unsigned int journal_inum
)
4085 struct inode
*journal_inode
;
4088 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4090 /* First, test for the existence of a valid inode on disk. Bad
4091 * things happen if we iget() an unused inode, as the subsequent
4092 * iput() will try to delete it. */
4094 journal_inode
= ext4_iget(sb
, journal_inum
);
4095 if (IS_ERR(journal_inode
)) {
4096 ext4_msg(sb
, KERN_ERR
, "no journal found");
4099 if (!journal_inode
->i_nlink
) {
4100 make_bad_inode(journal_inode
);
4101 iput(journal_inode
);
4102 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
4106 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4107 journal_inode
, journal_inode
->i_size
);
4108 if (!S_ISREG(journal_inode
->i_mode
)) {
4109 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
4110 iput(journal_inode
);
4114 journal
= jbd2_journal_init_inode(journal_inode
);
4116 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
4117 iput(journal_inode
);
4120 journal
->j_private
= sb
;
4121 ext4_init_journal_params(sb
, journal
);
4125 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
4128 struct buffer_head
*bh
;
4132 int hblock
, blocksize
;
4133 ext4_fsblk_t sb_block
;
4134 unsigned long offset
;
4135 struct ext4_super_block
*es
;
4136 struct block_device
*bdev
;
4138 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4140 bdev
= ext4_blkdev_get(j_dev
, sb
);
4144 blocksize
= sb
->s_blocksize
;
4145 hblock
= bdev_logical_block_size(bdev
);
4146 if (blocksize
< hblock
) {
4147 ext4_msg(sb
, KERN_ERR
,
4148 "blocksize too small for journal device");
4152 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
4153 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
4154 set_blocksize(bdev
, blocksize
);
4155 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
4156 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
4157 "external journal");
4161 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
4162 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
4163 !(le32_to_cpu(es
->s_feature_incompat
) &
4164 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
4165 ext4_msg(sb
, KERN_ERR
, "external journal has "
4171 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
4172 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
4177 len
= ext4_blocks_count(es
);
4178 start
= sb_block
+ 1;
4179 brelse(bh
); /* we're done with the superblock */
4181 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
4182 start
, len
, blocksize
);
4184 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
4187 journal
->j_private
= sb
;
4188 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
4189 wait_on_buffer(journal
->j_sb_buffer
);
4190 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
4191 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
4194 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
4195 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
4196 "user (unsupported) - %d",
4197 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
4200 EXT4_SB(sb
)->journal_bdev
= bdev
;
4201 ext4_init_journal_params(sb
, journal
);
4205 jbd2_journal_destroy(journal
);
4207 ext4_blkdev_put(bdev
);
4211 static int ext4_load_journal(struct super_block
*sb
,
4212 struct ext4_super_block
*es
,
4213 unsigned long journal_devnum
)
4216 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
4219 int really_read_only
;
4221 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4223 if (journal_devnum
&&
4224 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4225 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
4226 "numbers have changed");
4227 journal_dev
= new_decode_dev(journal_devnum
);
4229 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
4231 really_read_only
= bdev_read_only(sb
->s_bdev
);
4234 * Are we loading a blank journal or performing recovery after a
4235 * crash? For recovery, we need to check in advance whether we
4236 * can get read-write access to the device.
4238 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
4239 if (sb
->s_flags
& MS_RDONLY
) {
4240 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
4241 "required on readonly filesystem");
4242 if (really_read_only
) {
4243 ext4_msg(sb
, KERN_ERR
, "write access "
4244 "unavailable, cannot proceed");
4247 ext4_msg(sb
, KERN_INFO
, "write access will "
4248 "be enabled during recovery");
4252 if (journal_inum
&& journal_dev
) {
4253 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
4254 "and inode journals!");
4259 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
4262 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
4266 if (!(journal
->j_flags
& JBD2_BARRIER
))
4267 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
4269 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
4270 err
= jbd2_journal_wipe(journal
, !really_read_only
);
4272 char *save
= kmalloc(EXT4_S_ERR_LEN
, GFP_KERNEL
);
4274 memcpy(save
, ((char *) es
) +
4275 EXT4_S_ERR_START
, EXT4_S_ERR_LEN
);
4276 err
= jbd2_journal_load(journal
);
4278 memcpy(((char *) es
) + EXT4_S_ERR_START
,
4279 save
, EXT4_S_ERR_LEN
);
4284 ext4_msg(sb
, KERN_ERR
, "error loading journal");
4285 jbd2_journal_destroy(journal
);
4289 EXT4_SB(sb
)->s_journal
= journal
;
4290 ext4_clear_journal_err(sb
, es
);
4292 if (!really_read_only
&& journal_devnum
&&
4293 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4294 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
4296 /* Make sure we flush the recovery flag to disk. */
4297 ext4_commit_super(sb
, 1);
4303 static int ext4_commit_super(struct super_block
*sb
, int sync
)
4305 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
4306 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
4309 if (!sbh
|| block_device_ejected(sb
))
4311 if (buffer_write_io_error(sbh
)) {
4313 * Oh, dear. A previous attempt to write the
4314 * superblock failed. This could happen because the
4315 * USB device was yanked out. Or it could happen to
4316 * be a transient write error and maybe the block will
4317 * be remapped. Nothing we can do but to retry the
4318 * write and hope for the best.
4320 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
4321 "superblock detected");
4322 clear_buffer_write_io_error(sbh
);
4323 set_buffer_uptodate(sbh
);
4326 * If the file system is mounted read-only, don't update the
4327 * superblock write time. This avoids updating the superblock
4328 * write time when we are mounting the root file system
4329 * read/only but we need to replay the journal; at that point,
4330 * for people who are east of GMT and who make their clock
4331 * tick in localtime for Windows bug-for-bug compatibility,
4332 * the clock is set in the future, and this will cause e2fsck
4333 * to complain and force a full file system check.
4335 if (!(sb
->s_flags
& MS_RDONLY
))
4336 es
->s_wtime
= cpu_to_le32(get_seconds());
4337 if (sb
->s_bdev
->bd_part
)
4338 es
->s_kbytes_written
=
4339 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
4340 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
4341 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
4343 es
->s_kbytes_written
=
4344 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
);
4345 ext4_free_blocks_count_set(es
,
4346 EXT4_C2B(EXT4_SB(sb
), percpu_counter_sum_positive(
4347 &EXT4_SB(sb
)->s_freeclusters_counter
)));
4348 es
->s_free_inodes_count
=
4349 cpu_to_le32(percpu_counter_sum_positive(
4350 &EXT4_SB(sb
)->s_freeinodes_counter
));
4351 BUFFER_TRACE(sbh
, "marking dirty");
4352 ext4_superblock_csum_set(sb
, es
);
4353 mark_buffer_dirty(sbh
);
4355 error
= sync_dirty_buffer(sbh
);
4359 error
= buffer_write_io_error(sbh
);
4361 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
4363 clear_buffer_write_io_error(sbh
);
4364 set_buffer_uptodate(sbh
);
4371 * Have we just finished recovery? If so, and if we are mounting (or
4372 * remounting) the filesystem readonly, then we will end up with a
4373 * consistent fs on disk. Record that fact.
4375 static void ext4_mark_recovery_complete(struct super_block
*sb
,
4376 struct ext4_super_block
*es
)
4378 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
4380 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
4381 BUG_ON(journal
!= NULL
);
4384 jbd2_journal_lock_updates(journal
);
4385 if (jbd2_journal_flush(journal
) < 0)
4388 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
4389 sb
->s_flags
& MS_RDONLY
) {
4390 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4391 ext4_commit_super(sb
, 1);
4395 jbd2_journal_unlock_updates(journal
);
4399 * If we are mounting (or read-write remounting) a filesystem whose journal
4400 * has recorded an error from a previous lifetime, move that error to the
4401 * main filesystem now.
4403 static void ext4_clear_journal_err(struct super_block
*sb
,
4404 struct ext4_super_block
*es
)
4410 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4412 journal
= EXT4_SB(sb
)->s_journal
;
4415 * Now check for any error status which may have been recorded in the
4416 * journal by a prior ext4_error() or ext4_abort()
4419 j_errno
= jbd2_journal_errno(journal
);
4423 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
4424 ext4_warning(sb
, "Filesystem error recorded "
4425 "from previous mount: %s", errstr
);
4426 ext4_warning(sb
, "Marking fs in need of filesystem check.");
4428 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
4429 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
4430 ext4_commit_super(sb
, 1);
4432 jbd2_journal_clear_err(journal
);
4437 * Force the running and committing transactions to commit,
4438 * and wait on the commit.
4440 int ext4_force_commit(struct super_block
*sb
)
4445 if (sb
->s_flags
& MS_RDONLY
)
4448 journal
= EXT4_SB(sb
)->s_journal
;
4450 ret
= ext4_journal_force_commit(journal
);
4455 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
4459 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4461 trace_ext4_sync_fs(sb
, wait
);
4462 flush_workqueue(sbi
->dio_unwritten_wq
);
4464 * Writeback quota in non-journalled quota case - journalled quota has
4467 dquot_writeback_dquots(sb
, -1);
4468 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
4470 jbd2_log_wait_commit(sbi
->s_journal
, target
);
4476 * LVM calls this function before a (read-only) snapshot is created. This
4477 * gives us a chance to flush the journal completely and mark the fs clean.
4479 * Note that only this function cannot bring a filesystem to be in a clean
4480 * state independently. It relies on upper layer to stop all data & metadata
4483 static int ext4_freeze(struct super_block
*sb
)
4488 if (sb
->s_flags
& MS_RDONLY
)
4491 journal
= EXT4_SB(sb
)->s_journal
;
4493 /* Now we set up the journal barrier. */
4494 jbd2_journal_lock_updates(journal
);
4497 * Don't clear the needs_recovery flag if we failed to flush
4500 error
= jbd2_journal_flush(journal
);
4504 /* Journal blocked and flushed, clear needs_recovery flag. */
4505 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4506 error
= ext4_commit_super(sb
, 1);
4508 /* we rely on upper layer to stop further updates */
4509 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
4514 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4515 * flag here, even though the filesystem is not technically dirty yet.
4517 static int ext4_unfreeze(struct super_block
*sb
)
4519 if (sb
->s_flags
& MS_RDONLY
)
4523 /* Reset the needs_recovery flag before the fs is unlocked. */
4524 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4525 ext4_commit_super(sb
, 1);
4531 * Structure to save mount options for ext4_remount's benefit
4533 struct ext4_mount_options
{
4534 unsigned long s_mount_opt
;
4535 unsigned long s_mount_opt2
;
4538 unsigned long s_commit_interval
;
4539 u32 s_min_batch_time
, s_max_batch_time
;
4542 char *s_qf_names
[MAXQUOTAS
];
4546 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
4548 struct ext4_super_block
*es
;
4549 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4550 unsigned long old_sb_flags
;
4551 struct ext4_mount_options old_opts
;
4552 int enable_quota
= 0;
4554 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
4559 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
4561 /* Store the original options */
4563 old_sb_flags
= sb
->s_flags
;
4564 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
4565 old_opts
.s_mount_opt2
= sbi
->s_mount_opt2
;
4566 old_opts
.s_resuid
= sbi
->s_resuid
;
4567 old_opts
.s_resgid
= sbi
->s_resgid
;
4568 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
4569 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
4570 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
4572 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
4573 for (i
= 0; i
< MAXQUOTAS
; i
++)
4574 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
4576 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
4577 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
4580 * Allow the "check" option to be passed as a remount option.
4582 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
, 1)) {
4587 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
4588 ext4_abort(sb
, "Abort forced by user");
4590 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
4591 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
4595 if (sbi
->s_journal
) {
4596 ext4_init_journal_params(sb
, sbi
->s_journal
);
4597 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
4600 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
)) {
4601 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
4606 if (*flags
& MS_RDONLY
) {
4607 err
= dquot_suspend(sb
, -1);
4612 * First of all, the unconditional stuff we have to do
4613 * to disable replay of the journal when we next remount
4615 sb
->s_flags
|= MS_RDONLY
;
4618 * OK, test if we are remounting a valid rw partition
4619 * readonly, and if so set the rdonly flag and then
4620 * mark the partition as valid again.
4622 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
4623 (sbi
->s_mount_state
& EXT4_VALID_FS
))
4624 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
4627 ext4_mark_recovery_complete(sb
, es
);
4629 /* Make sure we can mount this feature set readwrite */
4630 if (!ext4_feature_set_ok(sb
, 0)) {
4635 * Make sure the group descriptor checksums
4636 * are sane. If they aren't, refuse to remount r/w.
4638 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
4639 struct ext4_group_desc
*gdp
=
4640 ext4_get_group_desc(sb
, g
, NULL
);
4642 if (!ext4_group_desc_csum_verify(sb
, g
, gdp
)) {
4643 ext4_msg(sb
, KERN_ERR
,
4644 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4645 g
, le16_to_cpu(ext4_group_desc_csum(sbi
, g
, gdp
)),
4646 le16_to_cpu(gdp
->bg_checksum
));
4653 * If we have an unprocessed orphan list hanging
4654 * around from a previously readonly bdev mount,
4655 * require a full umount/remount for now.
4657 if (es
->s_last_orphan
) {
4658 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
4659 "remount RDWR because of unprocessed "
4660 "orphan inode list. Please "
4661 "umount/remount instead");
4667 * Mounting a RDONLY partition read-write, so reread
4668 * and store the current valid flag. (It may have
4669 * been changed by e2fsck since we originally mounted
4673 ext4_clear_journal_err(sb
, es
);
4674 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
4675 if (!ext4_setup_super(sb
, es
, 0))
4676 sb
->s_flags
&= ~MS_RDONLY
;
4677 if (EXT4_HAS_INCOMPAT_FEATURE(sb
,
4678 EXT4_FEATURE_INCOMPAT_MMP
))
4679 if (ext4_multi_mount_protect(sb
,
4680 le64_to_cpu(es
->s_mmp_block
))) {
4689 * Reinitialize lazy itable initialization thread based on
4692 if ((sb
->s_flags
& MS_RDONLY
) || !test_opt(sb
, INIT_INODE_TABLE
))
4693 ext4_unregister_li_request(sb
);
4695 ext4_group_t first_not_zeroed
;
4696 first_not_zeroed
= ext4_has_uninit_itable(sb
);
4697 ext4_register_li_request(sb
, first_not_zeroed
);
4700 ext4_setup_system_zone(sb
);
4701 if (sbi
->s_journal
== NULL
)
4702 ext4_commit_super(sb
, 1);
4706 /* Release old quota file names */
4707 for (i
= 0; i
< MAXQUOTAS
; i
++)
4708 if (old_opts
.s_qf_names
[i
] &&
4709 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
4710 kfree(old_opts
.s_qf_names
[i
]);
4712 if (sb_any_quota_suspended(sb
))
4713 dquot_resume(sb
, -1);
4714 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
4715 EXT4_FEATURE_RO_COMPAT_QUOTA
)) {
4716 err
= ext4_enable_quotas(sb
);
4725 ext4_msg(sb
, KERN_INFO
, "re-mounted. Opts: %s", orig_data
);
4730 sb
->s_flags
= old_sb_flags
;
4731 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
4732 sbi
->s_mount_opt2
= old_opts
.s_mount_opt2
;
4733 sbi
->s_resuid
= old_opts
.s_resuid
;
4734 sbi
->s_resgid
= old_opts
.s_resgid
;
4735 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
4736 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
4737 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
4739 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
4740 for (i
= 0; i
< MAXQUOTAS
; i
++) {
4741 if (sbi
->s_qf_names
[i
] &&
4742 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
4743 kfree(sbi
->s_qf_names
[i
]);
4744 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
4752 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
4754 struct super_block
*sb
= dentry
->d_sb
;
4755 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4756 struct ext4_super_block
*es
= sbi
->s_es
;
4757 ext4_fsblk_t overhead
= 0;
4761 if (!test_opt(sb
, MINIX_DF
))
4762 overhead
= sbi
->s_overhead
;
4764 buf
->f_type
= EXT4_SUPER_MAGIC
;
4765 buf
->f_bsize
= sb
->s_blocksize
;
4766 buf
->f_blocks
= ext4_blocks_count(es
) - EXT4_C2B(sbi
, sbi
->s_overhead
);
4767 bfree
= percpu_counter_sum_positive(&sbi
->s_freeclusters_counter
) -
4768 percpu_counter_sum_positive(&sbi
->s_dirtyclusters_counter
);
4769 /* prevent underflow in case that few free space is available */
4770 buf
->f_bfree
= EXT4_C2B(sbi
, max_t(s64
, bfree
, 0));
4771 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
4772 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
4774 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
4775 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
4776 buf
->f_namelen
= EXT4_NAME_LEN
;
4777 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
4778 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
4779 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
4780 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
4785 /* Helper function for writing quotas on sync - we need to start transaction
4786 * before quota file is locked for write. Otherwise the are possible deadlocks:
4787 * Process 1 Process 2
4788 * ext4_create() quota_sync()
4789 * jbd2_journal_start() write_dquot()
4790 * dquot_initialize() down(dqio_mutex)
4791 * down(dqio_mutex) jbd2_journal_start()
4797 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
4799 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_type
];
4802 static int ext4_write_dquot(struct dquot
*dquot
)
4806 struct inode
*inode
;
4808 inode
= dquot_to_inode(dquot
);
4809 handle
= ext4_journal_start(inode
,
4810 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
4812 return PTR_ERR(handle
);
4813 ret
= dquot_commit(dquot
);
4814 err
= ext4_journal_stop(handle
);
4820 static int ext4_acquire_dquot(struct dquot
*dquot
)
4825 handle
= ext4_journal_start(dquot_to_inode(dquot
),
4826 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
4828 return PTR_ERR(handle
);
4829 ret
= dquot_acquire(dquot
);
4830 err
= ext4_journal_stop(handle
);
4836 static int ext4_release_dquot(struct dquot
*dquot
)
4841 handle
= ext4_journal_start(dquot_to_inode(dquot
),
4842 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
4843 if (IS_ERR(handle
)) {
4844 /* Release dquot anyway to avoid endless cycle in dqput() */
4845 dquot_release(dquot
);
4846 return PTR_ERR(handle
);
4848 ret
= dquot_release(dquot
);
4849 err
= ext4_journal_stop(handle
);
4855 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
4857 /* Are we journaling quotas? */
4858 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
4859 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
4860 dquot_mark_dquot_dirty(dquot
);
4861 return ext4_write_dquot(dquot
);
4863 return dquot_mark_dquot_dirty(dquot
);
4867 static int ext4_write_info(struct super_block
*sb
, int type
)
4872 /* Data block + inode block */
4873 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
4875 return PTR_ERR(handle
);
4876 ret
= dquot_commit_info(sb
, type
);
4877 err
= ext4_journal_stop(handle
);
4884 * Turn on quotas during mount time - we need to find
4885 * the quota file and such...
4887 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
4889 return dquot_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
4890 EXT4_SB(sb
)->s_jquota_fmt
, type
);
4894 * Standard function to be called on quota_on
4896 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
4901 if (!test_opt(sb
, QUOTA
))
4904 /* Quotafile not on the same filesystem? */
4905 if (path
->dentry
->d_sb
!= sb
)
4907 /* Journaling quota? */
4908 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
4909 /* Quotafile not in fs root? */
4910 if (path
->dentry
->d_parent
!= sb
->s_root
)
4911 ext4_msg(sb
, KERN_WARNING
,
4912 "Quota file not on filesystem root. "
4913 "Journaled quota will not work");
4917 * When we journal data on quota file, we have to flush journal to see
4918 * all updates to the file when we bypass pagecache...
4920 if (EXT4_SB(sb
)->s_journal
&&
4921 ext4_should_journal_data(path
->dentry
->d_inode
)) {
4923 * We don't need to lock updates but journal_flush() could
4924 * otherwise be livelocked...
4926 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
4927 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
4928 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
4933 return dquot_quota_on(sb
, type
, format_id
, path
);
4936 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
4940 struct inode
*qf_inode
;
4941 unsigned long qf_inums
[MAXQUOTAS
] = {
4942 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
4943 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
)
4946 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
));
4948 if (!qf_inums
[type
])
4951 qf_inode
= ext4_iget(sb
, qf_inums
[type
]);
4952 if (IS_ERR(qf_inode
)) {
4953 ext4_error(sb
, "Bad quota inode # %lu", qf_inums
[type
]);
4954 return PTR_ERR(qf_inode
);
4957 err
= dquot_enable(qf_inode
, type
, format_id
, flags
);
4963 /* Enable usage tracking for all quota types. */
4964 static int ext4_enable_quotas(struct super_block
*sb
)
4967 unsigned long qf_inums
[MAXQUOTAS
] = {
4968 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
4969 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
)
4972 sb_dqopt(sb
)->flags
|= DQUOT_QUOTA_SYS_FILE
;
4973 for (type
= 0; type
< MAXQUOTAS
; type
++) {
4974 if (qf_inums
[type
]) {
4975 err
= ext4_quota_enable(sb
, type
, QFMT_VFS_V1
,
4976 DQUOT_USAGE_ENABLED
);
4979 "Failed to enable quota (type=%d) "
4980 "tracking. Please run e2fsck to fix.",
4990 * quota_on function that is used when QUOTA feature is set.
4992 static int ext4_quota_on_sysfile(struct super_block
*sb
, int type
,
4995 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
))
4999 * USAGE was enabled at mount time. Only need to enable LIMITS now.
5001 return ext4_quota_enable(sb
, type
, format_id
, DQUOT_LIMITS_ENABLED
);
5004 static int ext4_quota_off(struct super_block
*sb
, int type
)
5006 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5009 /* Force all delayed allocation blocks to be allocated.
5010 * Caller already holds s_umount sem */
5011 if (test_opt(sb
, DELALLOC
))
5012 sync_filesystem(sb
);
5017 /* Update modification times of quota files when userspace can
5018 * start looking at them */
5019 handle
= ext4_journal_start(inode
, 1);
5022 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
5023 ext4_mark_inode_dirty(handle
, inode
);
5024 ext4_journal_stop(handle
);
5027 return dquot_quota_off(sb
, type
);
5031 * quota_off function that is used when QUOTA feature is set.
5033 static int ext4_quota_off_sysfile(struct super_block
*sb
, int type
)
5035 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
))
5038 /* Disable only the limits. */
5039 return dquot_disable(sb
, type
, DQUOT_LIMITS_ENABLED
);
5042 /* Read data from quotafile - avoid pagecache and such because we cannot afford
5043 * acquiring the locks... As quota files are never truncated and quota code
5044 * itself serializes the operations (and no one else should touch the files)
5045 * we don't have to be afraid of races */
5046 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
5047 size_t len
, loff_t off
)
5049 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5050 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5052 int offset
= off
& (sb
->s_blocksize
- 1);
5055 struct buffer_head
*bh
;
5056 loff_t i_size
= i_size_read(inode
);
5060 if (off
+len
> i_size
)
5063 while (toread
> 0) {
5064 tocopy
= sb
->s_blocksize
- offset
< toread
?
5065 sb
->s_blocksize
- offset
: toread
;
5066 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
5069 if (!bh
) /* A hole? */
5070 memset(data
, 0, tocopy
);
5072 memcpy(data
, bh
->b_data
+offset
, tocopy
);
5082 /* Write to quotafile (we know the transaction is already started and has
5083 * enough credits) */
5084 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
5085 const char *data
, size_t len
, loff_t off
)
5087 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5088 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5090 int offset
= off
& (sb
->s_blocksize
- 1);
5091 struct buffer_head
*bh
;
5092 handle_t
*handle
= journal_current_handle();
5094 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
5095 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5096 " cancelled because transaction is not started",
5097 (unsigned long long)off
, (unsigned long long)len
);
5101 * Since we account only one data block in transaction credits,
5102 * then it is impossible to cross a block boundary.
5104 if (sb
->s_blocksize
- offset
< len
) {
5105 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5106 " cancelled because not block aligned",
5107 (unsigned long long)off
, (unsigned long long)len
);
5111 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
5114 err
= ext4_journal_get_write_access(handle
, bh
);
5120 memcpy(bh
->b_data
+offset
, data
, len
);
5121 flush_dcache_page(bh
->b_page
);
5123 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
5128 if (inode
->i_size
< off
+ len
) {
5129 i_size_write(inode
, off
+ len
);
5130 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
5131 ext4_mark_inode_dirty(handle
, inode
);
5138 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
5139 const char *dev_name
, void *data
)
5141 return mount_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
);
5144 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5145 static inline void register_as_ext2(void)
5147 int err
= register_filesystem(&ext2_fs_type
);
5150 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
5153 static inline void unregister_as_ext2(void)
5155 unregister_filesystem(&ext2_fs_type
);
5158 static inline int ext2_feature_set_ok(struct super_block
*sb
)
5160 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT2_FEATURE_INCOMPAT_SUPP
))
5162 if (sb
->s_flags
& MS_RDONLY
)
5164 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT2_FEATURE_RO_COMPAT_SUPP
))
5168 MODULE_ALIAS("ext2");
5170 static inline void register_as_ext2(void) { }
5171 static inline void unregister_as_ext2(void) { }
5172 static inline int ext2_feature_set_ok(struct super_block
*sb
) { return 0; }
5175 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5176 static inline void register_as_ext3(void)
5178 int err
= register_filesystem(&ext3_fs_type
);
5181 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
5184 static inline void unregister_as_ext3(void)
5186 unregister_filesystem(&ext3_fs_type
);
5189 static inline int ext3_feature_set_ok(struct super_block
*sb
)
5191 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT3_FEATURE_INCOMPAT_SUPP
))
5193 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
5195 if (sb
->s_flags
& MS_RDONLY
)
5197 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT3_FEATURE_RO_COMPAT_SUPP
))
5201 MODULE_ALIAS("ext3");
5203 static inline void register_as_ext3(void) { }
5204 static inline void unregister_as_ext3(void) { }
5205 static inline int ext3_feature_set_ok(struct super_block
*sb
) { return 0; }
5208 static struct file_system_type ext4_fs_type
= {
5209 .owner
= THIS_MODULE
,
5211 .mount
= ext4_mount
,
5212 .kill_sb
= kill_block_super
,
5213 .fs_flags
= FS_REQUIRES_DEV
,
5216 static int __init
ext4_init_feat_adverts(void)
5218 struct ext4_features
*ef
;
5221 ef
= kzalloc(sizeof(struct ext4_features
), GFP_KERNEL
);
5225 ef
->f_kobj
.kset
= ext4_kset
;
5226 init_completion(&ef
->f_kobj_unregister
);
5227 ret
= kobject_init_and_add(&ef
->f_kobj
, &ext4_feat_ktype
, NULL
,
5240 static void ext4_exit_feat_adverts(void)
5242 kobject_put(&ext4_feat
->f_kobj
);
5243 wait_for_completion(&ext4_feat
->f_kobj_unregister
);
5247 /* Shared across all ext4 file systems */
5248 wait_queue_head_t ext4__ioend_wq
[EXT4_WQ_HASH_SZ
];
5249 struct mutex ext4__aio_mutex
[EXT4_WQ_HASH_SZ
];
5251 static int __init
ext4_init_fs(void)
5255 ext4_li_info
= NULL
;
5256 mutex_init(&ext4_li_mtx
);
5258 ext4_check_flag_values();
5260 for (i
= 0; i
< EXT4_WQ_HASH_SZ
; i
++) {
5261 mutex_init(&ext4__aio_mutex
[i
]);
5262 init_waitqueue_head(&ext4__ioend_wq
[i
]);
5265 err
= ext4_init_pageio();
5268 err
= ext4_init_system_zone();
5271 ext4_kset
= kset_create_and_add("ext4", NULL
, fs_kobj
);
5274 ext4_proc_root
= proc_mkdir("fs/ext4", NULL
);
5276 err
= ext4_init_feat_adverts();
5280 err
= ext4_init_mballoc();
5284 err
= ext4_init_xattr();
5287 err
= init_inodecache();
5292 err
= register_filesystem(&ext4_fs_type
);
5298 unregister_as_ext2();
5299 unregister_as_ext3();
5300 destroy_inodecache();
5304 ext4_exit_mballoc();
5306 ext4_exit_feat_adverts();
5309 remove_proc_entry("fs/ext4", NULL
);
5310 kset_unregister(ext4_kset
);
5312 ext4_exit_system_zone();
5318 static void __exit
ext4_exit_fs(void)
5320 ext4_destroy_lazyinit_thread();
5321 unregister_as_ext2();
5322 unregister_as_ext3();
5323 unregister_filesystem(&ext4_fs_type
);
5324 destroy_inodecache();
5326 ext4_exit_mballoc();
5327 ext4_exit_feat_adverts();
5328 remove_proc_entry("fs/ext4", NULL
);
5329 kset_unregister(ext4_kset
);
5330 ext4_exit_system_zone();
5334 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5335 MODULE_DESCRIPTION("Fourth Extended Filesystem");
5336 MODULE_LICENSE("GPL");
5337 module_init(ext4_init_fs
)
5338 module_exit(ext4_exit_fs
)