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 le32_add_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
);
864 if (sbi
->s_journal
) {
865 err
= jbd2_journal_destroy(sbi
->s_journal
);
866 sbi
->s_journal
= NULL
;
868 ext4_abort(sb
, "Couldn't clean up the journal");
871 del_timer(&sbi
->s_err_report
);
872 ext4_release_system_zone(sb
);
874 ext4_ext_release(sb
);
875 ext4_xattr_put_super(sb
);
877 if (!(sb
->s_flags
& MS_RDONLY
)) {
878 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
879 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
881 if (!(sb
->s_flags
& MS_RDONLY
))
882 ext4_commit_super(sb
, 1);
885 remove_proc_entry("options", sbi
->s_proc
);
886 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
888 kobject_del(&sbi
->s_kobj
);
890 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
891 brelse(sbi
->s_group_desc
[i
]);
892 ext4_kvfree(sbi
->s_group_desc
);
893 ext4_kvfree(sbi
->s_flex_groups
);
894 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
895 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
896 percpu_counter_destroy(&sbi
->s_dirs_counter
);
897 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
900 for (i
= 0; i
< MAXQUOTAS
; i
++)
901 kfree(sbi
->s_qf_names
[i
]);
904 /* Debugging code just in case the in-memory inode orphan list
905 * isn't empty. The on-disk one can be non-empty if we've
906 * detected an error and taken the fs readonly, but the
907 * in-memory list had better be clean by this point. */
908 if (!list_empty(&sbi
->s_orphan
))
909 dump_orphan_list(sb
, sbi
);
910 J_ASSERT(list_empty(&sbi
->s_orphan
));
912 invalidate_bdev(sb
->s_bdev
);
913 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
915 * Invalidate the journal device's buffers. We don't want them
916 * floating about in memory - the physical journal device may
917 * hotswapped, and it breaks the `ro-after' testing code.
919 sync_blockdev(sbi
->journal_bdev
);
920 invalidate_bdev(sbi
->journal_bdev
);
921 ext4_blkdev_remove(sbi
);
924 kthread_stop(sbi
->s_mmp_tsk
);
925 sb
->s_fs_info
= NULL
;
927 * Now that we are completely done shutting down the
928 * superblock, we need to actually destroy the kobject.
930 kobject_put(&sbi
->s_kobj
);
931 wait_for_completion(&sbi
->s_kobj_unregister
);
932 if (sbi
->s_chksum_driver
)
933 crypto_free_shash(sbi
->s_chksum_driver
);
934 kfree(sbi
->s_blockgroup_lock
);
938 static struct kmem_cache
*ext4_inode_cachep
;
941 * Called inside transaction, so use GFP_NOFS
943 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
945 struct ext4_inode_info
*ei
;
947 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
951 ei
->vfs_inode
.i_version
= 1;
952 ei
->vfs_inode
.i_data
.writeback_index
= 0;
953 memset(&ei
->i_cached_extent
, 0, sizeof(struct ext4_ext_cache
));
954 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
955 spin_lock_init(&ei
->i_prealloc_lock
);
956 ei
->i_reserved_data_blocks
= 0;
957 ei
->i_reserved_meta_blocks
= 0;
958 ei
->i_allocated_meta_blocks
= 0;
959 ei
->i_da_metadata_calc_len
= 0;
960 ei
->i_da_metadata_calc_last_lblock
= 0;
961 spin_lock_init(&(ei
->i_block_reservation_lock
));
963 ei
->i_reserved_quota
= 0;
966 INIT_LIST_HEAD(&ei
->i_completed_io_list
);
967 spin_lock_init(&ei
->i_completed_io_lock
);
969 ei
->i_datasync_tid
= 0;
970 atomic_set(&ei
->i_ioend_count
, 0);
971 atomic_set(&ei
->i_unwritten
, 0);
973 return &ei
->vfs_inode
;
976 static int ext4_drop_inode(struct inode
*inode
)
978 int drop
= generic_drop_inode(inode
);
980 trace_ext4_drop_inode(inode
, drop
);
984 static void ext4_i_callback(struct rcu_head
*head
)
986 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
987 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
990 static void ext4_destroy_inode(struct inode
*inode
)
992 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
993 ext4_msg(inode
->i_sb
, KERN_ERR
,
994 "Inode %lu (%p): orphan list check failed!",
995 inode
->i_ino
, EXT4_I(inode
));
996 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
997 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
1001 call_rcu(&inode
->i_rcu
, ext4_i_callback
);
1004 static void init_once(void *foo
)
1006 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
1008 INIT_LIST_HEAD(&ei
->i_orphan
);
1009 #ifdef CONFIG_EXT4_FS_XATTR
1010 init_rwsem(&ei
->xattr_sem
);
1012 init_rwsem(&ei
->i_data_sem
);
1013 inode_init_once(&ei
->vfs_inode
);
1016 static int init_inodecache(void)
1018 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
1019 sizeof(struct ext4_inode_info
),
1020 0, (SLAB_RECLAIM_ACCOUNT
|
1023 if (ext4_inode_cachep
== NULL
)
1028 static void destroy_inodecache(void)
1030 kmem_cache_destroy(ext4_inode_cachep
);
1033 void ext4_clear_inode(struct inode
*inode
)
1035 invalidate_inode_buffers(inode
);
1038 ext4_discard_preallocations(inode
);
1039 if (EXT4_I(inode
)->jinode
) {
1040 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode
),
1041 EXT4_I(inode
)->jinode
);
1042 jbd2_free_inode(EXT4_I(inode
)->jinode
);
1043 EXT4_I(inode
)->jinode
= NULL
;
1047 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
1048 u64 ino
, u32 generation
)
1050 struct inode
*inode
;
1052 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
1053 return ERR_PTR(-ESTALE
);
1054 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
1055 return ERR_PTR(-ESTALE
);
1057 /* iget isn't really right if the inode is currently unallocated!!
1059 * ext4_read_inode will return a bad_inode if the inode had been
1060 * deleted, so we should be safe.
1062 * Currently we don't know the generation for parent directory, so
1063 * a generation of 0 means "accept any"
1065 inode
= ext4_iget(sb
, ino
);
1067 return ERR_CAST(inode
);
1068 if (generation
&& inode
->i_generation
!= generation
) {
1070 return ERR_PTR(-ESTALE
);
1076 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
1077 int fh_len
, int fh_type
)
1079 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
1080 ext4_nfs_get_inode
);
1083 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
1084 int fh_len
, int fh_type
)
1086 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
1087 ext4_nfs_get_inode
);
1091 * Try to release metadata pages (indirect blocks, directories) which are
1092 * mapped via the block device. Since these pages could have journal heads
1093 * which would prevent try_to_free_buffers() from freeing them, we must use
1094 * jbd2 layer's try_to_free_buffers() function to release them.
1096 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
1099 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
1101 WARN_ON(PageChecked(page
));
1102 if (!page_has_buffers(page
))
1105 return jbd2_journal_try_to_free_buffers(journal
, page
,
1106 wait
& ~__GFP_WAIT
);
1107 return try_to_free_buffers(page
);
1111 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1112 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1114 static int ext4_write_dquot(struct dquot
*dquot
);
1115 static int ext4_acquire_dquot(struct dquot
*dquot
);
1116 static int ext4_release_dquot(struct dquot
*dquot
);
1117 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1118 static int ext4_write_info(struct super_block
*sb
, int type
);
1119 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1121 static int ext4_quota_on_sysfile(struct super_block
*sb
, int type
,
1123 static int ext4_quota_off(struct super_block
*sb
, int type
);
1124 static int ext4_quota_off_sysfile(struct super_block
*sb
, int type
);
1125 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1126 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1127 size_t len
, loff_t off
);
1128 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1129 const char *data
, size_t len
, loff_t off
);
1130 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
1131 unsigned int flags
);
1132 static int ext4_enable_quotas(struct super_block
*sb
);
1134 static const struct dquot_operations ext4_quota_operations
= {
1135 .get_reserved_space
= ext4_get_reserved_space
,
1136 .write_dquot
= ext4_write_dquot
,
1137 .acquire_dquot
= ext4_acquire_dquot
,
1138 .release_dquot
= ext4_release_dquot
,
1139 .mark_dirty
= ext4_mark_dquot_dirty
,
1140 .write_info
= ext4_write_info
,
1141 .alloc_dquot
= dquot_alloc
,
1142 .destroy_dquot
= dquot_destroy
,
1145 static const struct quotactl_ops ext4_qctl_operations
= {
1146 .quota_on
= ext4_quota_on
,
1147 .quota_off
= ext4_quota_off
,
1148 .quota_sync
= dquot_quota_sync
,
1149 .get_info
= dquot_get_dqinfo
,
1150 .set_info
= dquot_set_dqinfo
,
1151 .get_dqblk
= dquot_get_dqblk
,
1152 .set_dqblk
= dquot_set_dqblk
1155 static const struct quotactl_ops ext4_qctl_sysfile_operations
= {
1156 .quota_on_meta
= ext4_quota_on_sysfile
,
1157 .quota_off
= ext4_quota_off_sysfile
,
1158 .quota_sync
= dquot_quota_sync
,
1159 .get_info
= dquot_get_dqinfo
,
1160 .set_info
= dquot_set_dqinfo
,
1161 .get_dqblk
= dquot_get_dqblk
,
1162 .set_dqblk
= dquot_set_dqblk
1166 static const struct super_operations ext4_sops
= {
1167 .alloc_inode
= ext4_alloc_inode
,
1168 .destroy_inode
= ext4_destroy_inode
,
1169 .write_inode
= ext4_write_inode
,
1170 .dirty_inode
= ext4_dirty_inode
,
1171 .drop_inode
= ext4_drop_inode
,
1172 .evict_inode
= ext4_evict_inode
,
1173 .put_super
= ext4_put_super
,
1174 .sync_fs
= ext4_sync_fs
,
1175 .freeze_fs
= ext4_freeze
,
1176 .unfreeze_fs
= ext4_unfreeze
,
1177 .statfs
= ext4_statfs
,
1178 .remount_fs
= ext4_remount
,
1179 .show_options
= ext4_show_options
,
1181 .quota_read
= ext4_quota_read
,
1182 .quota_write
= ext4_quota_write
,
1184 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1187 static const struct super_operations ext4_nojournal_sops
= {
1188 .alloc_inode
= ext4_alloc_inode
,
1189 .destroy_inode
= ext4_destroy_inode
,
1190 .write_inode
= ext4_write_inode
,
1191 .dirty_inode
= ext4_dirty_inode
,
1192 .drop_inode
= ext4_drop_inode
,
1193 .evict_inode
= ext4_evict_inode
,
1194 .put_super
= ext4_put_super
,
1195 .statfs
= ext4_statfs
,
1196 .remount_fs
= ext4_remount
,
1197 .show_options
= ext4_show_options
,
1199 .quota_read
= ext4_quota_read
,
1200 .quota_write
= ext4_quota_write
,
1202 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1205 static const struct export_operations ext4_export_ops
= {
1206 .fh_to_dentry
= ext4_fh_to_dentry
,
1207 .fh_to_parent
= ext4_fh_to_parent
,
1208 .get_parent
= ext4_get_parent
,
1212 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1213 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1214 Opt_nouid32
, Opt_debug
, Opt_removed
,
1215 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1216 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
,
1217 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
,
1218 Opt_journal_dev
, Opt_journal_checksum
, Opt_journal_async_commit
,
1219 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1220 Opt_data_err_abort
, Opt_data_err_ignore
,
1221 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1222 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1223 Opt_noquota
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1224 Opt_usrquota
, Opt_grpquota
, Opt_i_version
,
1225 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
, Opt_mblk_io_submit
,
1226 Opt_nomblk_io_submit
, Opt_block_validity
, Opt_noblock_validity
,
1227 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1228 Opt_dioread_nolock
, Opt_dioread_lock
,
1229 Opt_discard
, Opt_nodiscard
, Opt_init_itable
, Opt_noinit_itable
,
1230 Opt_max_dir_size_kb
,
1233 static const match_table_t tokens
= {
1234 {Opt_bsd_df
, "bsddf"},
1235 {Opt_minix_df
, "minixdf"},
1236 {Opt_grpid
, "grpid"},
1237 {Opt_grpid
, "bsdgroups"},
1238 {Opt_nogrpid
, "nogrpid"},
1239 {Opt_nogrpid
, "sysvgroups"},
1240 {Opt_resgid
, "resgid=%u"},
1241 {Opt_resuid
, "resuid=%u"},
1243 {Opt_err_cont
, "errors=continue"},
1244 {Opt_err_panic
, "errors=panic"},
1245 {Opt_err_ro
, "errors=remount-ro"},
1246 {Opt_nouid32
, "nouid32"},
1247 {Opt_debug
, "debug"},
1248 {Opt_removed
, "oldalloc"},
1249 {Opt_removed
, "orlov"},
1250 {Opt_user_xattr
, "user_xattr"},
1251 {Opt_nouser_xattr
, "nouser_xattr"},
1253 {Opt_noacl
, "noacl"},
1254 {Opt_noload
, "norecovery"},
1255 {Opt_noload
, "noload"},
1256 {Opt_removed
, "nobh"},
1257 {Opt_removed
, "bh"},
1258 {Opt_commit
, "commit=%u"},
1259 {Opt_min_batch_time
, "min_batch_time=%u"},
1260 {Opt_max_batch_time
, "max_batch_time=%u"},
1261 {Opt_journal_dev
, "journal_dev=%u"},
1262 {Opt_journal_checksum
, "journal_checksum"},
1263 {Opt_journal_async_commit
, "journal_async_commit"},
1264 {Opt_abort
, "abort"},
1265 {Opt_data_journal
, "data=journal"},
1266 {Opt_data_ordered
, "data=ordered"},
1267 {Opt_data_writeback
, "data=writeback"},
1268 {Opt_data_err_abort
, "data_err=abort"},
1269 {Opt_data_err_ignore
, "data_err=ignore"},
1270 {Opt_offusrjquota
, "usrjquota="},
1271 {Opt_usrjquota
, "usrjquota=%s"},
1272 {Opt_offgrpjquota
, "grpjquota="},
1273 {Opt_grpjquota
, "grpjquota=%s"},
1274 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1275 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1276 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1277 {Opt_grpquota
, "grpquota"},
1278 {Opt_noquota
, "noquota"},
1279 {Opt_quota
, "quota"},
1280 {Opt_usrquota
, "usrquota"},
1281 {Opt_barrier
, "barrier=%u"},
1282 {Opt_barrier
, "barrier"},
1283 {Opt_nobarrier
, "nobarrier"},
1284 {Opt_i_version
, "i_version"},
1285 {Opt_stripe
, "stripe=%u"},
1286 {Opt_delalloc
, "delalloc"},
1287 {Opt_nodelalloc
, "nodelalloc"},
1288 {Opt_mblk_io_submit
, "mblk_io_submit"},
1289 {Opt_nomblk_io_submit
, "nomblk_io_submit"},
1290 {Opt_block_validity
, "block_validity"},
1291 {Opt_noblock_validity
, "noblock_validity"},
1292 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1293 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1294 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1295 {Opt_auto_da_alloc
, "auto_da_alloc"},
1296 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1297 {Opt_dioread_nolock
, "dioread_nolock"},
1298 {Opt_dioread_lock
, "dioread_lock"},
1299 {Opt_discard
, "discard"},
1300 {Opt_nodiscard
, "nodiscard"},
1301 {Opt_init_itable
, "init_itable=%u"},
1302 {Opt_init_itable
, "init_itable"},
1303 {Opt_noinit_itable
, "noinit_itable"},
1304 {Opt_max_dir_size_kb
, "max_dir_size_kb=%u"},
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
},
1485 {Opt_max_dir_size_kb
, 0, MOPT_GTE0
},
1489 static int handle_mount_opt(struct super_block
*sb
, char *opt
, int token
,
1490 substring_t
*args
, unsigned long *journal_devnum
,
1491 unsigned int *journal_ioprio
, int is_remount
)
1493 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1494 const struct mount_opts
*m
;
1500 if (token
== Opt_usrjquota
)
1501 return set_qf_name(sb
, USRQUOTA
, &args
[0]);
1502 else if (token
== Opt_grpjquota
)
1503 return set_qf_name(sb
, GRPQUOTA
, &args
[0]);
1504 else if (token
== Opt_offusrjquota
)
1505 return clear_qf_name(sb
, USRQUOTA
);
1506 else if (token
== Opt_offgrpjquota
)
1507 return clear_qf_name(sb
, GRPQUOTA
);
1509 if (args
->from
&& match_int(args
, &arg
))
1513 case Opt_nouser_xattr
:
1514 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, opt
, "3.5");
1517 return 1; /* handled by get_sb_block() */
1519 ext4_msg(sb
, KERN_WARNING
,
1520 "Ignoring removed %s option", opt
);
1523 uid
= make_kuid(current_user_ns(), arg
);
1524 if (!uid_valid(uid
)) {
1525 ext4_msg(sb
, KERN_ERR
, "Invalid uid value %d", arg
);
1528 sbi
->s_resuid
= uid
;
1531 gid
= make_kgid(current_user_ns(), arg
);
1532 if (!gid_valid(gid
)) {
1533 ext4_msg(sb
, KERN_ERR
, "Invalid gid value %d", arg
);
1536 sbi
->s_resgid
= gid
;
1539 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1542 sb
->s_flags
|= MS_I_VERSION
;
1544 case Opt_journal_dev
:
1546 ext4_msg(sb
, KERN_ERR
,
1547 "Cannot specify journal on remount");
1550 *journal_devnum
= arg
;
1552 case Opt_journal_ioprio
:
1553 if (arg
< 0 || arg
> 7)
1555 *journal_ioprio
= IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
, arg
);
1559 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++) {
1560 if (token
!= m
->token
)
1562 if (args
->from
&& (m
->flags
& MOPT_GTE0
) && (arg
< 0))
1564 if (m
->flags
& MOPT_EXPLICIT
)
1565 set_opt2(sb
, EXPLICIT_DELALLOC
);
1566 if (m
->flags
& MOPT_CLEAR_ERR
)
1567 clear_opt(sb
, ERRORS_MASK
);
1568 if (token
== Opt_noquota
&& sb_any_quota_loaded(sb
)) {
1569 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1570 "options when quota turned on");
1574 if (m
->flags
& MOPT_NOSUPPORT
) {
1575 ext4_msg(sb
, KERN_ERR
, "%s option not supported", opt
);
1576 } else if (token
== Opt_commit
) {
1578 arg
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1579 sbi
->s_commit_interval
= HZ
* arg
;
1580 } else if (token
== Opt_max_batch_time
) {
1582 arg
= EXT4_DEF_MAX_BATCH_TIME
;
1583 sbi
->s_max_batch_time
= arg
;
1584 } else if (token
== Opt_min_batch_time
) {
1585 sbi
->s_min_batch_time
= arg
;
1586 } else if (token
== Opt_inode_readahead_blks
) {
1587 if (arg
> (1 << 30))
1589 if (arg
&& !is_power_of_2(arg
)) {
1590 ext4_msg(sb
, KERN_ERR
,
1591 "EXT4-fs: inode_readahead_blks"
1592 " must be a power of 2");
1595 sbi
->s_inode_readahead_blks
= arg
;
1596 } else if (token
== Opt_init_itable
) {
1597 set_opt(sb
, INIT_INODE_TABLE
);
1599 arg
= EXT4_DEF_LI_WAIT_MULT
;
1600 sbi
->s_li_wait_mult
= arg
;
1601 } else if (token
== Opt_max_dir_size_kb
) {
1602 sbi
->s_max_dir_size_kb
= arg
;
1603 } else if (token
== Opt_stripe
) {
1604 sbi
->s_stripe
= arg
;
1605 } else if (m
->flags
& MOPT_DATAJ
) {
1607 if (!sbi
->s_journal
)
1608 ext4_msg(sb
, KERN_WARNING
, "Remounting file system with no journal so ignoring journalled data option");
1609 else if (test_opt(sb
, DATA_FLAGS
) !=
1611 ext4_msg(sb
, KERN_ERR
,
1612 "Cannot change data mode on remount");
1616 clear_opt(sb
, DATA_FLAGS
);
1617 sbi
->s_mount_opt
|= m
->mount_opt
;
1620 } else if (m
->flags
& MOPT_QFMT
) {
1621 if (sb_any_quota_loaded(sb
) &&
1622 sbi
->s_jquota_fmt
!= m
->mount_opt
) {
1623 ext4_msg(sb
, KERN_ERR
, "Cannot "
1624 "change journaled quota options "
1625 "when quota turned on");
1628 sbi
->s_jquota_fmt
= m
->mount_opt
;
1633 if (m
->flags
& MOPT_CLEAR
)
1635 else if (unlikely(!(m
->flags
& MOPT_SET
))) {
1636 ext4_msg(sb
, KERN_WARNING
,
1637 "buggy handling of option %s", opt
);
1642 sbi
->s_mount_opt
|= m
->mount_opt
;
1644 sbi
->s_mount_opt
&= ~m
->mount_opt
;
1648 ext4_msg(sb
, KERN_ERR
, "Unrecognized mount option \"%s\" "
1649 "or missing value", opt
);
1653 static int parse_options(char *options
, struct super_block
*sb
,
1654 unsigned long *journal_devnum
,
1655 unsigned int *journal_ioprio
,
1659 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1662 substring_t args
[MAX_OPT_ARGS
];
1668 while ((p
= strsep(&options
, ",")) != NULL
) {
1672 * Initialize args struct so we know whether arg was
1673 * found; some options take optional arguments.
1675 args
[0].to
= args
[0].from
= NULL
;
1676 token
= match_token(p
, tokens
, args
);
1677 if (handle_mount_opt(sb
, p
, token
, args
, journal_devnum
,
1678 journal_ioprio
, is_remount
) < 0)
1682 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1683 if (test_opt(sb
, USRQUOTA
) && sbi
->s_qf_names
[USRQUOTA
])
1684 clear_opt(sb
, USRQUOTA
);
1686 if (test_opt(sb
, GRPQUOTA
) && sbi
->s_qf_names
[GRPQUOTA
])
1687 clear_opt(sb
, GRPQUOTA
);
1689 if (test_opt(sb
, GRPQUOTA
) || test_opt(sb
, USRQUOTA
)) {
1690 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1695 if (!sbi
->s_jquota_fmt
) {
1696 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1701 if (sbi
->s_jquota_fmt
) {
1702 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1703 "specified with no journaling "
1712 static inline void ext4_show_quota_options(struct seq_file
*seq
,
1713 struct super_block
*sb
)
1715 #if defined(CONFIG_QUOTA)
1716 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1718 if (sbi
->s_jquota_fmt
) {
1721 switch (sbi
->s_jquota_fmt
) {
1732 seq_printf(seq
, ",jqfmt=%s", fmtname
);
1735 if (sbi
->s_qf_names
[USRQUOTA
])
1736 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
1738 if (sbi
->s_qf_names
[GRPQUOTA
])
1739 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
1741 if (test_opt(sb
, USRQUOTA
))
1742 seq_puts(seq
, ",usrquota");
1744 if (test_opt(sb
, GRPQUOTA
))
1745 seq_puts(seq
, ",grpquota");
1749 static const char *token2str(int token
)
1751 const struct match_token
*t
;
1753 for (t
= tokens
; t
->token
!= Opt_err
; t
++)
1754 if (t
->token
== token
&& !strchr(t
->pattern
, '='))
1761 * - it's set to a non-default value OR
1762 * - if the per-sb default is different from the global default
1764 static int _ext4_show_options(struct seq_file
*seq
, struct super_block
*sb
,
1767 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1768 struct ext4_super_block
*es
= sbi
->s_es
;
1769 int def_errors
, def_mount_opt
= nodefs
? 0 : sbi
->s_def_mount_opt
;
1770 const struct mount_opts
*m
;
1771 char sep
= nodefs
? '\n' : ',';
1773 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1774 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1776 if (sbi
->s_sb_block
!= 1)
1777 SEQ_OPTS_PRINT("sb=%llu", sbi
->s_sb_block
);
1779 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++) {
1780 int want_set
= m
->flags
& MOPT_SET
;
1781 if (((m
->flags
& (MOPT_SET
|MOPT_CLEAR
)) == 0) ||
1782 (m
->flags
& MOPT_CLEAR_ERR
))
1784 if (!(m
->mount_opt
& (sbi
->s_mount_opt
^ def_mount_opt
)))
1785 continue; /* skip if same as the default */
1787 (sbi
->s_mount_opt
& m
->mount_opt
) != m
->mount_opt
) ||
1788 (!want_set
&& (sbi
->s_mount_opt
& m
->mount_opt
)))
1789 continue; /* select Opt_noFoo vs Opt_Foo */
1790 SEQ_OPTS_PRINT("%s", token2str(m
->token
));
1793 if (nodefs
|| !uid_eq(sbi
->s_resuid
, make_kuid(&init_user_ns
, EXT4_DEF_RESUID
)) ||
1794 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
)
1795 SEQ_OPTS_PRINT("resuid=%u",
1796 from_kuid_munged(&init_user_ns
, sbi
->s_resuid
));
1797 if (nodefs
|| !gid_eq(sbi
->s_resgid
, make_kgid(&init_user_ns
, EXT4_DEF_RESGID
)) ||
1798 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
)
1799 SEQ_OPTS_PRINT("resgid=%u",
1800 from_kgid_munged(&init_user_ns
, sbi
->s_resgid
));
1801 def_errors
= nodefs
? -1 : le16_to_cpu(es
->s_errors
);
1802 if (test_opt(sb
, ERRORS_RO
) && def_errors
!= EXT4_ERRORS_RO
)
1803 SEQ_OPTS_PUTS("errors=remount-ro");
1804 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
1805 SEQ_OPTS_PUTS("errors=continue");
1806 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
1807 SEQ_OPTS_PUTS("errors=panic");
1808 if (nodefs
|| sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
)
1809 SEQ_OPTS_PRINT("commit=%lu", sbi
->s_commit_interval
/ HZ
);
1810 if (nodefs
|| sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
)
1811 SEQ_OPTS_PRINT("min_batch_time=%u", sbi
->s_min_batch_time
);
1812 if (nodefs
|| sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
)
1813 SEQ_OPTS_PRINT("max_batch_time=%u", sbi
->s_max_batch_time
);
1814 if (sb
->s_flags
& MS_I_VERSION
)
1815 SEQ_OPTS_PUTS("i_version");
1816 if (nodefs
|| sbi
->s_stripe
)
1817 SEQ_OPTS_PRINT("stripe=%lu", sbi
->s_stripe
);
1818 if (EXT4_MOUNT_DATA_FLAGS
& (sbi
->s_mount_opt
^ def_mount_opt
)) {
1819 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
1820 SEQ_OPTS_PUTS("data=journal");
1821 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
1822 SEQ_OPTS_PUTS("data=ordered");
1823 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
1824 SEQ_OPTS_PUTS("data=writeback");
1827 sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
1828 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1829 sbi
->s_inode_readahead_blks
);
1831 if (nodefs
|| (test_opt(sb
, INIT_INODE_TABLE
) &&
1832 (sbi
->s_li_wait_mult
!= EXT4_DEF_LI_WAIT_MULT
)))
1833 SEQ_OPTS_PRINT("init_itable=%u", sbi
->s_li_wait_mult
);
1834 if (nodefs
|| sbi
->s_max_dir_size_kb
)
1835 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi
->s_max_dir_size_kb
);
1837 ext4_show_quota_options(seq
, sb
);
1841 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
)
1843 return _ext4_show_options(seq
, root
->d_sb
, 0);
1846 static int options_seq_show(struct seq_file
*seq
, void *offset
)
1848 struct super_block
*sb
= seq
->private;
1851 seq_puts(seq
, (sb
->s_flags
& MS_RDONLY
) ? "ro" : "rw");
1852 rc
= _ext4_show_options(seq
, sb
, 1);
1853 seq_puts(seq
, "\n");
1857 static int options_open_fs(struct inode
*inode
, struct file
*file
)
1859 return single_open(file
, options_seq_show
, PDE(inode
)->data
);
1862 static const struct file_operations ext4_seq_options_fops
= {
1863 .owner
= THIS_MODULE
,
1864 .open
= options_open_fs
,
1866 .llseek
= seq_lseek
,
1867 .release
= single_release
,
1870 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1873 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1876 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1877 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
1878 "forcing read-only mode");
1883 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1884 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
1885 "running e2fsck is recommended");
1886 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1887 ext4_msg(sb
, KERN_WARNING
,
1888 "warning: mounting fs with errors, "
1889 "running e2fsck is recommended");
1890 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) > 0 &&
1891 le16_to_cpu(es
->s_mnt_count
) >=
1892 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1893 ext4_msg(sb
, KERN_WARNING
,
1894 "warning: maximal mount count reached, "
1895 "running e2fsck is recommended");
1896 else if (le32_to_cpu(es
->s_checkinterval
) &&
1897 (le32_to_cpu(es
->s_lastcheck
) +
1898 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1899 ext4_msg(sb
, KERN_WARNING
,
1900 "warning: checktime reached, "
1901 "running e2fsck is recommended");
1902 if (!sbi
->s_journal
)
1903 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1904 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1905 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1906 le16_add_cpu(&es
->s_mnt_count
, 1);
1907 es
->s_mtime
= cpu_to_le32(get_seconds());
1908 ext4_update_dynamic_rev(sb
);
1910 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1912 ext4_commit_super(sb
, 1);
1914 if (test_opt(sb
, DEBUG
))
1915 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
1916 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1918 sbi
->s_groups_count
,
1919 EXT4_BLOCKS_PER_GROUP(sb
),
1920 EXT4_INODES_PER_GROUP(sb
),
1921 sbi
->s_mount_opt
, sbi
->s_mount_opt2
);
1923 cleancache_init_fs(sb
);
1927 int ext4_alloc_flex_bg_array(struct super_block
*sb
, ext4_group_t ngroup
)
1929 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1930 struct flex_groups
*new_groups
;
1933 if (!sbi
->s_log_groups_per_flex
)
1936 size
= ext4_flex_group(sbi
, ngroup
- 1) + 1;
1937 if (size
<= sbi
->s_flex_groups_allocated
)
1940 size
= roundup_pow_of_two(size
* sizeof(struct flex_groups
));
1941 new_groups
= ext4_kvzalloc(size
, GFP_KERNEL
);
1943 ext4_msg(sb
, KERN_ERR
, "not enough memory for %d flex groups",
1944 size
/ (int) sizeof(struct flex_groups
));
1948 if (sbi
->s_flex_groups
) {
1949 memcpy(new_groups
, sbi
->s_flex_groups
,
1950 (sbi
->s_flex_groups_allocated
*
1951 sizeof(struct flex_groups
)));
1952 ext4_kvfree(sbi
->s_flex_groups
);
1954 sbi
->s_flex_groups
= new_groups
;
1955 sbi
->s_flex_groups_allocated
= size
/ sizeof(struct flex_groups
);
1959 static int ext4_fill_flex_info(struct super_block
*sb
)
1961 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1962 struct ext4_group_desc
*gdp
= NULL
;
1963 ext4_group_t flex_group
;
1964 unsigned int groups_per_flex
= 0;
1967 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1968 if (sbi
->s_log_groups_per_flex
< 1 || sbi
->s_log_groups_per_flex
> 31) {
1969 sbi
->s_log_groups_per_flex
= 0;
1972 groups_per_flex
= 1 << sbi
->s_log_groups_per_flex
;
1974 err
= ext4_alloc_flex_bg_array(sb
, sbi
->s_groups_count
);
1978 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1979 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1981 flex_group
= ext4_flex_group(sbi
, i
);
1982 atomic_add(ext4_free_inodes_count(sb
, gdp
),
1983 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
1984 atomic_add(ext4_free_group_clusters(sb
, gdp
),
1985 &sbi
->s_flex_groups
[flex_group
].free_clusters
);
1986 atomic_add(ext4_used_dirs_count(sb
, gdp
),
1987 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
1995 static __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
1996 struct ext4_group_desc
*gdp
)
2000 __le32 le_group
= cpu_to_le32(block_group
);
2002 if ((sbi
->s_es
->s_feature_ro_compat
&
2003 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))) {
2004 /* Use new metadata_csum algorithm */
2008 old_csum
= gdp
->bg_checksum
;
2009 gdp
->bg_checksum
= 0;
2010 csum32
= ext4_chksum(sbi
, sbi
->s_csum_seed
, (__u8
*)&le_group
,
2012 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)gdp
,
2014 gdp
->bg_checksum
= old_csum
;
2016 crc
= csum32
& 0xFFFF;
2020 /* old crc16 code */
2021 offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
2023 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
2024 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
2025 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
2026 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
2027 /* for checksum of struct ext4_group_desc do the rest...*/
2028 if ((sbi
->s_es
->s_feature_incompat
&
2029 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
2030 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
2031 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
2032 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
2036 return cpu_to_le16(crc
);
2039 int ext4_group_desc_csum_verify(struct super_block
*sb
, __u32 block_group
,
2040 struct ext4_group_desc
*gdp
)
2042 if (ext4_has_group_desc_csum(sb
) &&
2043 (gdp
->bg_checksum
!= ext4_group_desc_csum(EXT4_SB(sb
),
2050 void ext4_group_desc_csum_set(struct super_block
*sb
, __u32 block_group
,
2051 struct ext4_group_desc
*gdp
)
2053 if (!ext4_has_group_desc_csum(sb
))
2055 gdp
->bg_checksum
= ext4_group_desc_csum(EXT4_SB(sb
), block_group
, gdp
);
2058 /* Called at mount-time, super-block is locked */
2059 static int ext4_check_descriptors(struct super_block
*sb
,
2060 ext4_group_t
*first_not_zeroed
)
2062 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2063 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
2064 ext4_fsblk_t last_block
;
2065 ext4_fsblk_t block_bitmap
;
2066 ext4_fsblk_t inode_bitmap
;
2067 ext4_fsblk_t inode_table
;
2068 int flexbg_flag
= 0;
2069 ext4_group_t i
, grp
= sbi
->s_groups_count
;
2071 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
2074 ext4_debug("Checking group descriptors");
2076 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
2077 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2079 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
2080 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
2082 last_block
= first_block
+
2083 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2085 if ((grp
== sbi
->s_groups_count
) &&
2086 !(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2089 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
2090 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
2091 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2092 "Block bitmap for group %u not in group "
2093 "(block %llu)!", i
, block_bitmap
);
2096 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
2097 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
2098 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2099 "Inode bitmap for group %u not in group "
2100 "(block %llu)!", i
, inode_bitmap
);
2103 inode_table
= ext4_inode_table(sb
, gdp
);
2104 if (inode_table
< first_block
||
2105 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
2106 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2107 "Inode table for group %u not in group "
2108 "(block %llu)!", i
, inode_table
);
2111 ext4_lock_group(sb
, i
);
2112 if (!ext4_group_desc_csum_verify(sb
, i
, gdp
)) {
2113 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2114 "Checksum for group %u failed (%u!=%u)",
2115 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
2116 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
2117 if (!(sb
->s_flags
& MS_RDONLY
)) {
2118 ext4_unlock_group(sb
, i
);
2122 ext4_unlock_group(sb
, i
);
2124 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
2126 if (NULL
!= first_not_zeroed
)
2127 *first_not_zeroed
= grp
;
2129 ext4_free_blocks_count_set(sbi
->s_es
,
2130 EXT4_C2B(sbi
, ext4_count_free_clusters(sb
)));
2131 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
2135 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2136 * the superblock) which were deleted from all directories, but held open by
2137 * a process at the time of a crash. We walk the list and try to delete these
2138 * inodes at recovery time (only with a read-write filesystem).
2140 * In order to keep the orphan inode chain consistent during traversal (in
2141 * case of crash during recovery), we link each inode into the superblock
2142 * orphan list_head and handle it the same way as an inode deletion during
2143 * normal operation (which journals the operations for us).
2145 * We only do an iget() and an iput() on each inode, which is very safe if we
2146 * accidentally point at an in-use or already deleted inode. The worst that
2147 * can happen in this case is that we get a "bit already cleared" message from
2148 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2149 * e2fsck was run on this filesystem, and it must have already done the orphan
2150 * inode cleanup for us, so we can safely abort without any further action.
2152 static void ext4_orphan_cleanup(struct super_block
*sb
,
2153 struct ext4_super_block
*es
)
2155 unsigned int s_flags
= sb
->s_flags
;
2156 int nr_orphans
= 0, nr_truncates
= 0;
2160 if (!es
->s_last_orphan
) {
2161 jbd_debug(4, "no orphan inodes to clean up\n");
2165 if (bdev_read_only(sb
->s_bdev
)) {
2166 ext4_msg(sb
, KERN_ERR
, "write access "
2167 "unavailable, skipping orphan cleanup");
2171 /* Check if feature set would not allow a r/w mount */
2172 if (!ext4_feature_set_ok(sb
, 0)) {
2173 ext4_msg(sb
, KERN_INFO
, "Skipping orphan cleanup due to "
2174 "unknown ROCOMPAT features");
2178 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2179 /* don't clear list on RO mount w/ errors */
2180 if (es
->s_last_orphan
&& !(s_flags
& MS_RDONLY
)) {
2181 jbd_debug(1, "Errors on filesystem, "
2182 "clearing orphan list.\n");
2183 es
->s_last_orphan
= 0;
2185 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2189 if (s_flags
& MS_RDONLY
) {
2190 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
2191 sb
->s_flags
&= ~MS_RDONLY
;
2194 /* Needed for iput() to work correctly and not trash data */
2195 sb
->s_flags
|= MS_ACTIVE
;
2196 /* Turn on quotas so that they are updated correctly */
2197 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2198 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
2199 int ret
= ext4_quota_on_mount(sb
, i
);
2201 ext4_msg(sb
, KERN_ERR
,
2202 "Cannot turn on journaled "
2203 "quota: error %d", ret
);
2208 while (es
->s_last_orphan
) {
2209 struct inode
*inode
;
2211 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
2212 if (IS_ERR(inode
)) {
2213 es
->s_last_orphan
= 0;
2217 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
2218 dquot_initialize(inode
);
2219 if (inode
->i_nlink
) {
2220 ext4_msg(sb
, KERN_DEBUG
,
2221 "%s: truncating inode %lu to %lld bytes",
2222 __func__
, inode
->i_ino
, inode
->i_size
);
2223 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2224 inode
->i_ino
, inode
->i_size
);
2225 ext4_truncate(inode
);
2228 ext4_msg(sb
, KERN_DEBUG
,
2229 "%s: deleting unreferenced inode %lu",
2230 __func__
, inode
->i_ino
);
2231 jbd_debug(2, "deleting unreferenced inode %lu\n",
2235 iput(inode
); /* The delete magic happens here! */
2238 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2241 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
2242 PLURAL(nr_orphans
));
2244 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
2245 PLURAL(nr_truncates
));
2247 /* Turn quotas off */
2248 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2249 if (sb_dqopt(sb
)->files
[i
])
2250 dquot_quota_off(sb
, i
);
2253 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
2257 * Maximal extent format file size.
2258 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2259 * extent format containers, within a sector_t, and within i_blocks
2260 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2261 * so that won't be a limiting factor.
2263 * However there is other limiting factor. We do store extents in the form
2264 * of starting block and length, hence the resulting length of the extent
2265 * covering maximum file size must fit into on-disk format containers as
2266 * well. Given that length is always by 1 unit bigger than max unit (because
2267 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2269 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2271 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
2274 loff_t upper_limit
= MAX_LFS_FILESIZE
;
2276 /* small i_blocks in vfs inode? */
2277 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2279 * CONFIG_LBDAF is not enabled implies the inode
2280 * i_block represent total blocks in 512 bytes
2281 * 32 == size of vfs inode i_blocks * 8
2283 upper_limit
= (1LL << 32) - 1;
2285 /* total blocks in file system block size */
2286 upper_limit
>>= (blkbits
- 9);
2287 upper_limit
<<= blkbits
;
2291 * 32-bit extent-start container, ee_block. We lower the maxbytes
2292 * by one fs block, so ee_len can cover the extent of maximum file
2295 res
= (1LL << 32) - 1;
2298 /* Sanity check against vm- & vfs- imposed limits */
2299 if (res
> upper_limit
)
2306 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2307 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2308 * We need to be 1 filesystem block less than the 2^48 sector limit.
2310 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2312 loff_t res
= EXT4_NDIR_BLOCKS
;
2315 /* This is calculated to be the largest file size for a dense, block
2316 * mapped file such that the file's total number of 512-byte sectors,
2317 * including data and all indirect blocks, does not exceed (2^48 - 1).
2319 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2320 * number of 512-byte sectors of the file.
2323 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2325 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2326 * the inode i_block field represents total file blocks in
2327 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2329 upper_limit
= (1LL << 32) - 1;
2331 /* total blocks in file system block size */
2332 upper_limit
>>= (bits
- 9);
2336 * We use 48 bit ext4_inode i_blocks
2337 * With EXT4_HUGE_FILE_FL set the i_blocks
2338 * represent total number of blocks in
2339 * file system block size
2341 upper_limit
= (1LL << 48) - 1;
2345 /* indirect blocks */
2347 /* double indirect blocks */
2348 meta_blocks
+= 1 + (1LL << (bits
-2));
2349 /* tripple indirect blocks */
2350 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2352 upper_limit
-= meta_blocks
;
2353 upper_limit
<<= bits
;
2355 res
+= 1LL << (bits
-2);
2356 res
+= 1LL << (2*(bits
-2));
2357 res
+= 1LL << (3*(bits
-2));
2359 if (res
> upper_limit
)
2362 if (res
> MAX_LFS_FILESIZE
)
2363 res
= MAX_LFS_FILESIZE
;
2368 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2369 ext4_fsblk_t logical_sb_block
, int nr
)
2371 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2372 ext4_group_t bg
, first_meta_bg
;
2375 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2377 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
2379 return logical_sb_block
+ nr
+ 1;
2380 bg
= sbi
->s_desc_per_block
* nr
;
2381 if (ext4_bg_has_super(sb
, bg
))
2384 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2388 * ext4_get_stripe_size: Get the stripe size.
2389 * @sbi: In memory super block info
2391 * If we have specified it via mount option, then
2392 * use the mount option value. If the value specified at mount time is
2393 * greater than the blocks per group use the super block value.
2394 * If the super block value is greater than blocks per group return 0.
2395 * Allocator needs it be less than blocks per group.
2398 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2400 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2401 unsigned long stripe_width
=
2402 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2405 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2406 ret
= sbi
->s_stripe
;
2407 else if (stripe_width
<= sbi
->s_blocks_per_group
)
2409 else if (stride
<= sbi
->s_blocks_per_group
)
2415 * If the stripe width is 1, this makes no sense and
2416 * we set it to 0 to turn off stripe handling code.
2427 struct attribute attr
;
2428 ssize_t (*show
)(struct ext4_attr
*, struct ext4_sb_info
*, char *);
2429 ssize_t (*store
)(struct ext4_attr
*, struct ext4_sb_info
*,
2430 const char *, size_t);
2434 static int parse_strtoul(const char *buf
,
2435 unsigned long max
, unsigned long *value
)
2439 *value
= simple_strtoul(skip_spaces(buf
), &endp
, 0);
2440 endp
= skip_spaces(endp
);
2441 if (*endp
|| *value
> max
)
2447 static ssize_t
delayed_allocation_blocks_show(struct ext4_attr
*a
,
2448 struct ext4_sb_info
*sbi
,
2451 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2453 percpu_counter_sum(&sbi
->s_dirtyclusters_counter
)));
2456 static ssize_t
session_write_kbytes_show(struct ext4_attr
*a
,
2457 struct ext4_sb_info
*sbi
, char *buf
)
2459 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2461 if (!sb
->s_bdev
->bd_part
)
2462 return snprintf(buf
, PAGE_SIZE
, "0\n");
2463 return snprintf(buf
, PAGE_SIZE
, "%lu\n",
2464 (part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2465 sbi
->s_sectors_written_start
) >> 1);
2468 static ssize_t
lifetime_write_kbytes_show(struct ext4_attr
*a
,
2469 struct ext4_sb_info
*sbi
, char *buf
)
2471 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2473 if (!sb
->s_bdev
->bd_part
)
2474 return snprintf(buf
, PAGE_SIZE
, "0\n");
2475 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2476 (unsigned long long)(sbi
->s_kbytes_written
+
2477 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2478 EXT4_SB(sb
)->s_sectors_written_start
) >> 1)));
2481 static ssize_t
inode_readahead_blks_store(struct ext4_attr
*a
,
2482 struct ext4_sb_info
*sbi
,
2483 const char *buf
, size_t count
)
2487 if (parse_strtoul(buf
, 0x40000000, &t
))
2490 if (t
&& !is_power_of_2(t
))
2493 sbi
->s_inode_readahead_blks
= t
;
2497 static ssize_t
sbi_ui_show(struct ext4_attr
*a
,
2498 struct ext4_sb_info
*sbi
, char *buf
)
2500 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2502 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
2505 static ssize_t
sbi_ui_store(struct ext4_attr
*a
,
2506 struct ext4_sb_info
*sbi
,
2507 const char *buf
, size_t count
)
2509 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2512 if (parse_strtoul(buf
, 0xffffffff, &t
))
2518 static ssize_t
trigger_test_error(struct ext4_attr
*a
,
2519 struct ext4_sb_info
*sbi
,
2520 const char *buf
, size_t count
)
2524 if (!capable(CAP_SYS_ADMIN
))
2527 if (len
&& buf
[len
-1] == '\n')
2531 ext4_error(sbi
->s_sb
, "%.*s", len
, buf
);
2535 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2536 static struct ext4_attr ext4_attr_##_name = { \
2537 .attr = {.name = __stringify(_name), .mode = _mode }, \
2540 .offset = offsetof(struct ext4_sb_info, _elname), \
2542 #define EXT4_ATTR(name, mode, show, store) \
2543 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2545 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2546 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2547 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2548 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2549 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2550 #define ATTR_LIST(name) &ext4_attr_##name.attr
2552 EXT4_RO_ATTR(delayed_allocation_blocks
);
2553 EXT4_RO_ATTR(session_write_kbytes
);
2554 EXT4_RO_ATTR(lifetime_write_kbytes
);
2555 EXT4_ATTR_OFFSET(inode_readahead_blks
, 0644, sbi_ui_show
,
2556 inode_readahead_blks_store
, s_inode_readahead_blks
);
2557 EXT4_RW_ATTR_SBI_UI(inode_goal
, s_inode_goal
);
2558 EXT4_RW_ATTR_SBI_UI(mb_stats
, s_mb_stats
);
2559 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan
, s_mb_max_to_scan
);
2560 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan
, s_mb_min_to_scan
);
2561 EXT4_RW_ATTR_SBI_UI(mb_order2_req
, s_mb_order2_reqs
);
2562 EXT4_RW_ATTR_SBI_UI(mb_stream_req
, s_mb_stream_request
);
2563 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc
, s_mb_group_prealloc
);
2564 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump
, s_max_writeback_mb_bump
);
2565 EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb
, s_extent_max_zeroout_kb
);
2566 EXT4_ATTR(trigger_fs_error
, 0200, NULL
, trigger_test_error
);
2568 static struct attribute
*ext4_attrs
[] = {
2569 ATTR_LIST(delayed_allocation_blocks
),
2570 ATTR_LIST(session_write_kbytes
),
2571 ATTR_LIST(lifetime_write_kbytes
),
2572 ATTR_LIST(inode_readahead_blks
),
2573 ATTR_LIST(inode_goal
),
2574 ATTR_LIST(mb_stats
),
2575 ATTR_LIST(mb_max_to_scan
),
2576 ATTR_LIST(mb_min_to_scan
),
2577 ATTR_LIST(mb_order2_req
),
2578 ATTR_LIST(mb_stream_req
),
2579 ATTR_LIST(mb_group_prealloc
),
2580 ATTR_LIST(max_writeback_mb_bump
),
2581 ATTR_LIST(extent_max_zeroout_kb
),
2582 ATTR_LIST(trigger_fs_error
),
2586 /* Features this copy of ext4 supports */
2587 EXT4_INFO_ATTR(lazy_itable_init
);
2588 EXT4_INFO_ATTR(batched_discard
);
2589 EXT4_INFO_ATTR(meta_bg_resize
);
2591 static struct attribute
*ext4_feat_attrs
[] = {
2592 ATTR_LIST(lazy_itable_init
),
2593 ATTR_LIST(batched_discard
),
2594 ATTR_LIST(meta_bg_resize
),
2598 static ssize_t
ext4_attr_show(struct kobject
*kobj
,
2599 struct attribute
*attr
, char *buf
)
2601 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2603 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2605 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
2608 static ssize_t
ext4_attr_store(struct kobject
*kobj
,
2609 struct attribute
*attr
,
2610 const char *buf
, size_t len
)
2612 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2614 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2616 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
2619 static void ext4_sb_release(struct kobject
*kobj
)
2621 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2623 complete(&sbi
->s_kobj_unregister
);
2626 static const struct sysfs_ops ext4_attr_ops
= {
2627 .show
= ext4_attr_show
,
2628 .store
= ext4_attr_store
,
2631 static struct kobj_type ext4_ktype
= {
2632 .default_attrs
= ext4_attrs
,
2633 .sysfs_ops
= &ext4_attr_ops
,
2634 .release
= ext4_sb_release
,
2637 static void ext4_feat_release(struct kobject
*kobj
)
2639 complete(&ext4_feat
->f_kobj_unregister
);
2642 static struct kobj_type ext4_feat_ktype
= {
2643 .default_attrs
= ext4_feat_attrs
,
2644 .sysfs_ops
= &ext4_attr_ops
,
2645 .release
= ext4_feat_release
,
2649 * Check whether this filesystem can be mounted based on
2650 * the features present and the RDONLY/RDWR mount requested.
2651 * Returns 1 if this filesystem can be mounted as requested,
2652 * 0 if it cannot be.
2654 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2656 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
)) {
2657 ext4_msg(sb
, KERN_ERR
,
2658 "Couldn't mount because of "
2659 "unsupported optional features (%x)",
2660 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2661 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2668 /* Check that feature set is OK for a read-write mount */
2669 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
)) {
2670 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2671 "unsupported optional features (%x)",
2672 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2673 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2677 * Large file size enabled file system can only be mounted
2678 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2680 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
2681 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2682 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2683 "cannot be mounted RDWR without "
2688 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_BIGALLOC
) &&
2689 !EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_EXTENTS
)) {
2690 ext4_msg(sb
, KERN_ERR
,
2691 "Can't support bigalloc feature without "
2692 "extents feature\n");
2696 #ifndef CONFIG_QUOTA
2697 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
) &&
2699 ext4_msg(sb
, KERN_ERR
,
2700 "Filesystem with quota feature cannot be mounted RDWR "
2701 "without CONFIG_QUOTA");
2704 #endif /* CONFIG_QUOTA */
2709 * This function is called once a day if we have errors logged
2710 * on the file system
2712 static void print_daily_error_info(unsigned long arg
)
2714 struct super_block
*sb
= (struct super_block
*) arg
;
2715 struct ext4_sb_info
*sbi
;
2716 struct ext4_super_block
*es
;
2721 if (es
->s_error_count
)
2722 ext4_msg(sb
, KERN_NOTICE
, "error count: %u",
2723 le32_to_cpu(es
->s_error_count
));
2724 if (es
->s_first_error_time
) {
2725 printk(KERN_NOTICE
"EXT4-fs (%s): initial error at %u: %.*s:%d",
2726 sb
->s_id
, le32_to_cpu(es
->s_first_error_time
),
2727 (int) sizeof(es
->s_first_error_func
),
2728 es
->s_first_error_func
,
2729 le32_to_cpu(es
->s_first_error_line
));
2730 if (es
->s_first_error_ino
)
2731 printk(": inode %u",
2732 le32_to_cpu(es
->s_first_error_ino
));
2733 if (es
->s_first_error_block
)
2734 printk(": block %llu", (unsigned long long)
2735 le64_to_cpu(es
->s_first_error_block
));
2738 if (es
->s_last_error_time
) {
2739 printk(KERN_NOTICE
"EXT4-fs (%s): last error at %u: %.*s:%d",
2740 sb
->s_id
, le32_to_cpu(es
->s_last_error_time
),
2741 (int) sizeof(es
->s_last_error_func
),
2742 es
->s_last_error_func
,
2743 le32_to_cpu(es
->s_last_error_line
));
2744 if (es
->s_last_error_ino
)
2745 printk(": inode %u",
2746 le32_to_cpu(es
->s_last_error_ino
));
2747 if (es
->s_last_error_block
)
2748 printk(": block %llu", (unsigned long long)
2749 le64_to_cpu(es
->s_last_error_block
));
2752 mod_timer(&sbi
->s_err_report
, jiffies
+ 24*60*60*HZ
); /* Once a day */
2755 /* Find next suitable group and run ext4_init_inode_table */
2756 static int ext4_run_li_request(struct ext4_li_request
*elr
)
2758 struct ext4_group_desc
*gdp
= NULL
;
2759 ext4_group_t group
, ngroups
;
2760 struct super_block
*sb
;
2761 unsigned long timeout
= 0;
2765 ngroups
= EXT4_SB(sb
)->s_groups_count
;
2768 for (group
= elr
->lr_next_group
; group
< ngroups
; group
++) {
2769 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2775 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2779 if (group
== ngroups
)
2784 ret
= ext4_init_inode_table(sb
, group
,
2785 elr
->lr_timeout
? 0 : 1);
2786 if (elr
->lr_timeout
== 0) {
2787 timeout
= (jiffies
- timeout
) *
2788 elr
->lr_sbi
->s_li_wait_mult
;
2789 elr
->lr_timeout
= timeout
;
2791 elr
->lr_next_sched
= jiffies
+ elr
->lr_timeout
;
2792 elr
->lr_next_group
= group
+ 1;
2800 * Remove lr_request from the list_request and free the
2801 * request structure. Should be called with li_list_mtx held
2803 static void ext4_remove_li_request(struct ext4_li_request
*elr
)
2805 struct ext4_sb_info
*sbi
;
2812 list_del(&elr
->lr_request
);
2813 sbi
->s_li_request
= NULL
;
2817 static void ext4_unregister_li_request(struct super_block
*sb
)
2819 mutex_lock(&ext4_li_mtx
);
2820 if (!ext4_li_info
) {
2821 mutex_unlock(&ext4_li_mtx
);
2825 mutex_lock(&ext4_li_info
->li_list_mtx
);
2826 ext4_remove_li_request(EXT4_SB(sb
)->s_li_request
);
2827 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2828 mutex_unlock(&ext4_li_mtx
);
2831 static struct task_struct
*ext4_lazyinit_task
;
2834 * This is the function where ext4lazyinit thread lives. It walks
2835 * through the request list searching for next scheduled filesystem.
2836 * When such a fs is found, run the lazy initialization request
2837 * (ext4_rn_li_request) and keep track of the time spend in this
2838 * function. Based on that time we compute next schedule time of
2839 * the request. When walking through the list is complete, compute
2840 * next waking time and put itself into sleep.
2842 static int ext4_lazyinit_thread(void *arg
)
2844 struct ext4_lazy_init
*eli
= (struct ext4_lazy_init
*)arg
;
2845 struct list_head
*pos
, *n
;
2846 struct ext4_li_request
*elr
;
2847 unsigned long next_wakeup
, cur
;
2849 BUG_ON(NULL
== eli
);
2853 next_wakeup
= MAX_JIFFY_OFFSET
;
2855 mutex_lock(&eli
->li_list_mtx
);
2856 if (list_empty(&eli
->li_request_list
)) {
2857 mutex_unlock(&eli
->li_list_mtx
);
2861 list_for_each_safe(pos
, n
, &eli
->li_request_list
) {
2862 elr
= list_entry(pos
, struct ext4_li_request
,
2865 if (time_after_eq(jiffies
, elr
->lr_next_sched
)) {
2866 if (ext4_run_li_request(elr
) != 0) {
2867 /* error, remove the lazy_init job */
2868 ext4_remove_li_request(elr
);
2873 if (time_before(elr
->lr_next_sched
, next_wakeup
))
2874 next_wakeup
= elr
->lr_next_sched
;
2876 mutex_unlock(&eli
->li_list_mtx
);
2881 if ((time_after_eq(cur
, next_wakeup
)) ||
2882 (MAX_JIFFY_OFFSET
== next_wakeup
)) {
2887 schedule_timeout_interruptible(next_wakeup
- cur
);
2889 if (kthread_should_stop()) {
2890 ext4_clear_request_list();
2897 * It looks like the request list is empty, but we need
2898 * to check it under the li_list_mtx lock, to prevent any
2899 * additions into it, and of course we should lock ext4_li_mtx
2900 * to atomically free the list and ext4_li_info, because at
2901 * this point another ext4 filesystem could be registering
2904 mutex_lock(&ext4_li_mtx
);
2905 mutex_lock(&eli
->li_list_mtx
);
2906 if (!list_empty(&eli
->li_request_list
)) {
2907 mutex_unlock(&eli
->li_list_mtx
);
2908 mutex_unlock(&ext4_li_mtx
);
2911 mutex_unlock(&eli
->li_list_mtx
);
2912 kfree(ext4_li_info
);
2913 ext4_li_info
= NULL
;
2914 mutex_unlock(&ext4_li_mtx
);
2919 static void ext4_clear_request_list(void)
2921 struct list_head
*pos
, *n
;
2922 struct ext4_li_request
*elr
;
2924 mutex_lock(&ext4_li_info
->li_list_mtx
);
2925 list_for_each_safe(pos
, n
, &ext4_li_info
->li_request_list
) {
2926 elr
= list_entry(pos
, struct ext4_li_request
,
2928 ext4_remove_li_request(elr
);
2930 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2933 static int ext4_run_lazyinit_thread(void)
2935 ext4_lazyinit_task
= kthread_run(ext4_lazyinit_thread
,
2936 ext4_li_info
, "ext4lazyinit");
2937 if (IS_ERR(ext4_lazyinit_task
)) {
2938 int err
= PTR_ERR(ext4_lazyinit_task
);
2939 ext4_clear_request_list();
2940 kfree(ext4_li_info
);
2941 ext4_li_info
= NULL
;
2942 printk(KERN_CRIT
"EXT4-fs: error %d creating inode table "
2943 "initialization thread\n",
2947 ext4_li_info
->li_state
|= EXT4_LAZYINIT_RUNNING
;
2952 * Check whether it make sense to run itable init. thread or not.
2953 * If there is at least one uninitialized inode table, return
2954 * corresponding group number, else the loop goes through all
2955 * groups and return total number of groups.
2957 static ext4_group_t
ext4_has_uninit_itable(struct super_block
*sb
)
2959 ext4_group_t group
, ngroups
= EXT4_SB(sb
)->s_groups_count
;
2960 struct ext4_group_desc
*gdp
= NULL
;
2962 for (group
= 0; group
< ngroups
; group
++) {
2963 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2967 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2974 static int ext4_li_info_new(void)
2976 struct ext4_lazy_init
*eli
= NULL
;
2978 eli
= kzalloc(sizeof(*eli
), GFP_KERNEL
);
2982 INIT_LIST_HEAD(&eli
->li_request_list
);
2983 mutex_init(&eli
->li_list_mtx
);
2985 eli
->li_state
|= EXT4_LAZYINIT_QUIT
;
2992 static struct ext4_li_request
*ext4_li_request_new(struct super_block
*sb
,
2995 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2996 struct ext4_li_request
*elr
;
2999 elr
= kzalloc(sizeof(*elr
), GFP_KERNEL
);
3005 elr
->lr_next_group
= start
;
3008 * Randomize first schedule time of the request to
3009 * spread the inode table initialization requests
3012 get_random_bytes(&rnd
, sizeof(rnd
));
3013 elr
->lr_next_sched
= jiffies
+ (unsigned long)rnd
%
3014 (EXT4_DEF_LI_MAX_START_DELAY
* HZ
);
3019 static int ext4_register_li_request(struct super_block
*sb
,
3020 ext4_group_t first_not_zeroed
)
3022 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3023 struct ext4_li_request
*elr
;
3024 ext4_group_t ngroups
= EXT4_SB(sb
)->s_groups_count
;
3027 if (sbi
->s_li_request
!= NULL
) {
3029 * Reset timeout so it can be computed again, because
3030 * s_li_wait_mult might have changed.
3032 sbi
->s_li_request
->lr_timeout
= 0;
3036 if (first_not_zeroed
== ngroups
||
3037 (sb
->s_flags
& MS_RDONLY
) ||
3038 !test_opt(sb
, INIT_INODE_TABLE
))
3041 elr
= ext4_li_request_new(sb
, first_not_zeroed
);
3045 mutex_lock(&ext4_li_mtx
);
3047 if (NULL
== ext4_li_info
) {
3048 ret
= ext4_li_info_new();
3053 mutex_lock(&ext4_li_info
->li_list_mtx
);
3054 list_add(&elr
->lr_request
, &ext4_li_info
->li_request_list
);
3055 mutex_unlock(&ext4_li_info
->li_list_mtx
);
3057 sbi
->s_li_request
= elr
;
3059 * set elr to NULL here since it has been inserted to
3060 * the request_list and the removal and free of it is
3061 * handled by ext4_clear_request_list from now on.
3065 if (!(ext4_li_info
->li_state
& EXT4_LAZYINIT_RUNNING
)) {
3066 ret
= ext4_run_lazyinit_thread();
3071 mutex_unlock(&ext4_li_mtx
);
3078 * We do not need to lock anything since this is called on
3081 static void ext4_destroy_lazyinit_thread(void)
3084 * If thread exited earlier
3085 * there's nothing to be done.
3087 if (!ext4_li_info
|| !ext4_lazyinit_task
)
3090 kthread_stop(ext4_lazyinit_task
);
3093 static int set_journal_csum_feature_set(struct super_block
*sb
)
3096 int compat
, incompat
;
3097 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3099 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3100 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
)) {
3101 /* journal checksum v2 */
3103 incompat
= JBD2_FEATURE_INCOMPAT_CSUM_V2
;
3105 /* journal checksum v1 */
3106 compat
= JBD2_FEATURE_COMPAT_CHECKSUM
;
3110 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
3111 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3113 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
|
3115 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
3116 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3119 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3120 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3122 jbd2_journal_clear_features(sbi
->s_journal
,
3123 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
3124 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
|
3125 JBD2_FEATURE_INCOMPAT_CSUM_V2
);
3132 * Note: calculating the overhead so we can be compatible with
3133 * historical BSD practice is quite difficult in the face of
3134 * clusters/bigalloc. This is because multiple metadata blocks from
3135 * different block group can end up in the same allocation cluster.
3136 * Calculating the exact overhead in the face of clustered allocation
3137 * requires either O(all block bitmaps) in memory or O(number of block
3138 * groups**2) in time. We will still calculate the superblock for
3139 * older file systems --- and if we come across with a bigalloc file
3140 * system with zero in s_overhead_clusters the estimate will be close to
3141 * correct especially for very large cluster sizes --- but for newer
3142 * file systems, it's better to calculate this figure once at mkfs
3143 * time, and store it in the superblock. If the superblock value is
3144 * present (even for non-bigalloc file systems), we will use it.
3146 static int count_overhead(struct super_block
*sb
, ext4_group_t grp
,
3149 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3150 struct ext4_group_desc
*gdp
;
3151 ext4_fsblk_t first_block
, last_block
, b
;
3152 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3153 int s
, j
, count
= 0;
3155 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_BIGALLOC
))
3156 return (ext4_bg_has_super(sb
, grp
) + ext4_bg_num_gdb(sb
, grp
) +
3157 sbi
->s_itb_per_group
+ 2);
3159 first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
) +
3160 (grp
* EXT4_BLOCKS_PER_GROUP(sb
));
3161 last_block
= first_block
+ EXT4_BLOCKS_PER_GROUP(sb
) - 1;
3162 for (i
= 0; i
< ngroups
; i
++) {
3163 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
3164 b
= ext4_block_bitmap(sb
, gdp
);
3165 if (b
>= first_block
&& b
<= last_block
) {
3166 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3169 b
= ext4_inode_bitmap(sb
, gdp
);
3170 if (b
>= first_block
&& b
<= last_block
) {
3171 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3174 b
= ext4_inode_table(sb
, gdp
);
3175 if (b
>= first_block
&& b
+ sbi
->s_itb_per_group
<= last_block
)
3176 for (j
= 0; j
< sbi
->s_itb_per_group
; j
++, b
++) {
3177 int c
= EXT4_B2C(sbi
, b
- first_block
);
3178 ext4_set_bit(c
, buf
);
3184 if (ext4_bg_has_super(sb
, grp
)) {
3185 ext4_set_bit(s
++, buf
);
3188 for (j
= ext4_bg_num_gdb(sb
, grp
); j
> 0; j
--) {
3189 ext4_set_bit(EXT4_B2C(sbi
, s
++), buf
);
3195 return EXT4_CLUSTERS_PER_GROUP(sb
) -
3196 ext4_count_free(buf
, EXT4_CLUSTERS_PER_GROUP(sb
) / 8);
3200 * Compute the overhead and stash it in sbi->s_overhead
3202 int ext4_calculate_overhead(struct super_block
*sb
)
3204 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3205 struct ext4_super_block
*es
= sbi
->s_es
;
3206 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3207 ext4_fsblk_t overhead
= 0;
3208 char *buf
= (char *) get_zeroed_page(GFP_KERNEL
);
3210 memset(buf
, 0, PAGE_SIZE
);
3215 * Compute the overhead (FS structures). This is constant
3216 * for a given filesystem unless the number of block groups
3217 * changes so we cache the previous value until it does.
3221 * All of the blocks before first_data_block are overhead
3223 overhead
= EXT4_B2C(sbi
, le32_to_cpu(es
->s_first_data_block
));
3226 * Add the overhead found in each block group
3228 for (i
= 0; i
< ngroups
; i
++) {
3231 blks
= count_overhead(sb
, i
, buf
);
3234 memset(buf
, 0, PAGE_SIZE
);
3237 sbi
->s_overhead
= overhead
;
3239 free_page((unsigned long) buf
);
3243 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
3245 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
3246 struct buffer_head
*bh
;
3247 struct ext4_super_block
*es
= NULL
;
3248 struct ext4_sb_info
*sbi
;
3250 ext4_fsblk_t sb_block
= get_sb_block(&data
);
3251 ext4_fsblk_t logical_sb_block
;
3252 unsigned long offset
= 0;
3253 unsigned long journal_devnum
= 0;
3254 unsigned long def_mount_opts
;
3259 int blocksize
, clustersize
;
3260 unsigned int db_count
;
3262 int needs_recovery
, has_huge_files
, has_bigalloc
;
3265 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3266 ext4_group_t first_not_zeroed
;
3268 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
3272 sbi
->s_blockgroup_lock
=
3273 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
3274 if (!sbi
->s_blockgroup_lock
) {
3278 sb
->s_fs_info
= sbi
;
3280 sbi
->s_mount_opt
= 0;
3281 sbi
->s_resuid
= make_kuid(&init_user_ns
, EXT4_DEF_RESUID
);
3282 sbi
->s_resgid
= make_kgid(&init_user_ns
, EXT4_DEF_RESGID
);
3283 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
3284 sbi
->s_sb_block
= sb_block
;
3285 if (sb
->s_bdev
->bd_part
)
3286 sbi
->s_sectors_written_start
=
3287 part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]);
3289 /* Cleanup superblock name */
3290 for (cp
= sb
->s_id
; (cp
= strchr(cp
, '/'));)
3294 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
3296 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
3301 * The ext4 superblock will not be buffer aligned for other than 1kB
3302 * block sizes. We need to calculate the offset from buffer start.
3304 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
3305 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3306 offset
= do_div(logical_sb_block
, blocksize
);
3308 logical_sb_block
= sb_block
;
3311 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
3312 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
3316 * Note: s_es must be initialized as soon as possible because
3317 * some ext4 macro-instructions depend on its value
3319 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
3321 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
3322 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
3324 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
3326 /* Warn if metadata_csum and gdt_csum are both set. */
3327 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3328 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
) &&
3329 EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_GDT_CSUM
))
3330 ext4_warning(sb
, KERN_INFO
"metadata_csum and uninit_bg are "
3331 "redundant flags; please run fsck.");
3333 /* Check for a known checksum algorithm */
3334 if (!ext4_verify_csum_type(sb
, es
)) {
3335 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3336 "unknown checksum algorithm.");
3341 /* Load the checksum driver */
3342 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3343 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
)) {
3344 sbi
->s_chksum_driver
= crypto_alloc_shash("crc32c", 0, 0);
3345 if (IS_ERR(sbi
->s_chksum_driver
)) {
3346 ext4_msg(sb
, KERN_ERR
, "Cannot load crc32c driver.");
3347 ret
= PTR_ERR(sbi
->s_chksum_driver
);
3348 sbi
->s_chksum_driver
= NULL
;
3353 /* Check superblock checksum */
3354 if (!ext4_superblock_csum_verify(sb
, es
)) {
3355 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3356 "invalid superblock checksum. Run e2fsck?");
3361 /* Precompute checksum seed for all metadata */
3362 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3363 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))
3364 sbi
->s_csum_seed
= ext4_chksum(sbi
, ~0, es
->s_uuid
,
3365 sizeof(es
->s_uuid
));
3367 /* Set defaults before we parse the mount options */
3368 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
3369 set_opt(sb
, INIT_INODE_TABLE
);
3370 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
3372 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
3374 if (def_mount_opts
& EXT4_DEFM_UID16
)
3375 set_opt(sb
, NO_UID32
);
3376 /* xattr user namespace & acls are now defaulted on */
3377 #ifdef CONFIG_EXT4_FS_XATTR
3378 set_opt(sb
, XATTR_USER
);
3380 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3381 set_opt(sb
, POSIX_ACL
);
3383 set_opt(sb
, MBLK_IO_SUBMIT
);
3384 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
3385 set_opt(sb
, JOURNAL_DATA
);
3386 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
3387 set_opt(sb
, ORDERED_DATA
);
3388 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
3389 set_opt(sb
, WRITEBACK_DATA
);
3391 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
3392 set_opt(sb
, ERRORS_PANIC
);
3393 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
3394 set_opt(sb
, ERRORS_CONT
);
3396 set_opt(sb
, ERRORS_RO
);
3397 if (def_mount_opts
& EXT4_DEFM_BLOCK_VALIDITY
)
3398 set_opt(sb
, BLOCK_VALIDITY
);
3399 if (def_mount_opts
& EXT4_DEFM_DISCARD
)
3400 set_opt(sb
, DISCARD
);
3402 sbi
->s_resuid
= make_kuid(&init_user_ns
, le16_to_cpu(es
->s_def_resuid
));
3403 sbi
->s_resgid
= make_kgid(&init_user_ns
, le16_to_cpu(es
->s_def_resgid
));
3404 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
3405 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
3406 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
3408 if ((def_mount_opts
& EXT4_DEFM_NOBARRIER
) == 0)
3409 set_opt(sb
, BARRIER
);
3412 * enable delayed allocation by default
3413 * Use -o nodelalloc to turn it off
3415 if (!IS_EXT3_SB(sb
) && !IS_EXT2_SB(sb
) &&
3416 ((def_mount_opts
& EXT4_DEFM_NODELALLOC
) == 0))
3417 set_opt(sb
, DELALLOC
);
3420 * set default s_li_wait_mult for lazyinit, for the case there is
3421 * no mount option specified.
3423 sbi
->s_li_wait_mult
= EXT4_DEF_LI_WAIT_MULT
;
3425 if (!parse_options((char *) sbi
->s_es
->s_mount_opts
, sb
,
3426 &journal_devnum
, &journal_ioprio
, 0)) {
3427 ext4_msg(sb
, KERN_WARNING
,
3428 "failed to parse options in superblock: %s",
3429 sbi
->s_es
->s_mount_opts
);
3431 sbi
->s_def_mount_opt
= sbi
->s_mount_opt
;
3432 if (!parse_options((char *) data
, sb
, &journal_devnum
,
3433 &journal_ioprio
, 0))
3436 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
3437 printk_once(KERN_WARNING
"EXT4-fs: Warning: mounting "
3438 "with data=journal disables delayed "
3439 "allocation and O_DIRECT support!\n");
3440 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
3441 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3442 "both data=journal and delalloc");
3445 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
3446 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3447 "both data=journal and delalloc");
3450 if (test_opt(sb
, DELALLOC
))
3451 clear_opt(sb
, DELALLOC
);
3454 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
3455 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
3456 if (blocksize
< PAGE_SIZE
) {
3457 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3458 "dioread_nolock if block size != PAGE_SIZE");
3463 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3464 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
3466 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
3467 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
3468 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
3469 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
3470 ext4_msg(sb
, KERN_WARNING
,
3471 "feature flags set on rev 0 fs, "
3472 "running e2fsck is recommended");
3474 if (IS_EXT2_SB(sb
)) {
3475 if (ext2_feature_set_ok(sb
))
3476 ext4_msg(sb
, KERN_INFO
, "mounting ext2 file system "
3477 "using the ext4 subsystem");
3479 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext2 due "
3480 "to feature incompatibilities");
3485 if (IS_EXT3_SB(sb
)) {
3486 if (ext3_feature_set_ok(sb
))
3487 ext4_msg(sb
, KERN_INFO
, "mounting ext3 file system "
3488 "using the ext4 subsystem");
3490 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext3 due "
3491 "to feature incompatibilities");
3497 * Check feature flags regardless of the revision level, since we
3498 * previously didn't change the revision level when setting the flags,
3499 * so there is a chance incompat flags are set on a rev 0 filesystem.
3501 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
3504 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
3505 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
3506 ext4_msg(sb
, KERN_ERR
,
3507 "Unsupported filesystem blocksize %d", blocksize
);
3511 if (sb
->s_blocksize
!= blocksize
) {
3512 /* Validate the filesystem blocksize */
3513 if (!sb_set_blocksize(sb
, blocksize
)) {
3514 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
3520 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3521 offset
= do_div(logical_sb_block
, blocksize
);
3522 bh
= sb_bread(sb
, logical_sb_block
);
3524 ext4_msg(sb
, KERN_ERR
,
3525 "Can't read superblock on 2nd try");
3528 es
= (struct ext4_super_block
*)(bh
->b_data
+ offset
);
3530 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
3531 ext4_msg(sb
, KERN_ERR
,
3532 "Magic mismatch, very weird!");
3537 has_huge_files
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3538 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
);
3539 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
3541 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
3543 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
3544 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
3545 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
3547 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
3548 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
3549 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
3550 (!is_power_of_2(sbi
->s_inode_size
)) ||
3551 (sbi
->s_inode_size
> blocksize
)) {
3552 ext4_msg(sb
, KERN_ERR
,
3553 "unsupported inode size: %d",
3557 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
3558 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
3561 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
3562 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
3563 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
3564 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
3565 !is_power_of_2(sbi
->s_desc_size
)) {
3566 ext4_msg(sb
, KERN_ERR
,
3567 "unsupported descriptor size %lu",
3572 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
3574 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
3575 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
3576 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
3579 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
3580 if (sbi
->s_inodes_per_block
== 0)
3582 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
3583 sbi
->s_inodes_per_block
;
3584 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
3586 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3587 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
3588 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
3590 for (i
= 0; i
< 4; i
++)
3591 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
3592 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
3593 i
= le32_to_cpu(es
->s_flags
);
3594 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
3595 sbi
->s_hash_unsigned
= 3;
3596 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
3597 #ifdef __CHAR_UNSIGNED__
3598 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
3599 sbi
->s_hash_unsigned
= 3;
3601 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
3605 /* Handle clustersize */
3606 clustersize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_cluster_size
);
3607 has_bigalloc
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3608 EXT4_FEATURE_RO_COMPAT_BIGALLOC
);
3610 if (clustersize
< blocksize
) {
3611 ext4_msg(sb
, KERN_ERR
,
3612 "cluster size (%d) smaller than "
3613 "block size (%d)", clustersize
, blocksize
);
3616 sbi
->s_cluster_bits
= le32_to_cpu(es
->s_log_cluster_size
) -
3617 le32_to_cpu(es
->s_log_block_size
);
3618 sbi
->s_clusters_per_group
=
3619 le32_to_cpu(es
->s_clusters_per_group
);
3620 if (sbi
->s_clusters_per_group
> blocksize
* 8) {
3621 ext4_msg(sb
, KERN_ERR
,
3622 "#clusters per group too big: %lu",
3623 sbi
->s_clusters_per_group
);
3626 if (sbi
->s_blocks_per_group
!=
3627 (sbi
->s_clusters_per_group
* (clustersize
/ blocksize
))) {
3628 ext4_msg(sb
, KERN_ERR
, "blocks per group (%lu) and "
3629 "clusters per group (%lu) inconsistent",
3630 sbi
->s_blocks_per_group
,
3631 sbi
->s_clusters_per_group
);
3635 if (clustersize
!= blocksize
) {
3636 ext4_warning(sb
, "fragment/cluster size (%d) != "
3637 "block size (%d)", clustersize
,
3639 clustersize
= blocksize
;
3641 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
3642 ext4_msg(sb
, KERN_ERR
,
3643 "#blocks per group too big: %lu",
3644 sbi
->s_blocks_per_group
);
3647 sbi
->s_clusters_per_group
= sbi
->s_blocks_per_group
;
3648 sbi
->s_cluster_bits
= 0;
3650 sbi
->s_cluster_ratio
= clustersize
/ blocksize
;
3652 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
3653 ext4_msg(sb
, KERN_ERR
,
3654 "#inodes per group too big: %lu",
3655 sbi
->s_inodes_per_group
);
3660 * Test whether we have more sectors than will fit in sector_t,
3661 * and whether the max offset is addressable by the page cache.
3663 err
= generic_check_addressable(sb
->s_blocksize_bits
,
3664 ext4_blocks_count(es
));
3666 ext4_msg(sb
, KERN_ERR
, "filesystem"
3667 " too large to mount safely on this system");
3668 if (sizeof(sector_t
) < 8)
3669 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
3674 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
3677 /* check blocks count against device size */
3678 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
3679 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
3680 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
3681 "exceeds size of device (%llu blocks)",
3682 ext4_blocks_count(es
), blocks_count
);
3687 * It makes no sense for the first data block to be beyond the end
3688 * of the filesystem.
3690 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
3691 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data "
3692 "block %u is beyond end of filesystem (%llu)",
3693 le32_to_cpu(es
->s_first_data_block
),
3694 ext4_blocks_count(es
));
3697 blocks_count
= (ext4_blocks_count(es
) -
3698 le32_to_cpu(es
->s_first_data_block
) +
3699 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
3700 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
3701 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
3702 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
3703 "(block count %llu, first data block %u, "
3704 "blocks per group %lu)", sbi
->s_groups_count
,
3705 ext4_blocks_count(es
),
3706 le32_to_cpu(es
->s_first_data_block
),
3707 EXT4_BLOCKS_PER_GROUP(sb
));
3710 sbi
->s_groups_count
= blocks_count
;
3711 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
3712 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
3713 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
3714 EXT4_DESC_PER_BLOCK(sb
);
3715 sbi
->s_group_desc
= ext4_kvmalloc(db_count
*
3716 sizeof(struct buffer_head
*),
3718 if (sbi
->s_group_desc
== NULL
) {
3719 ext4_msg(sb
, KERN_ERR
, "not enough memory");
3725 sbi
->s_proc
= proc_mkdir(sb
->s_id
, ext4_proc_root
);
3728 proc_create_data("options", S_IRUGO
, sbi
->s_proc
,
3729 &ext4_seq_options_fops
, sb
);
3731 bgl_lock_init(sbi
->s_blockgroup_lock
);
3733 for (i
= 0; i
< db_count
; i
++) {
3734 block
= descriptor_loc(sb
, logical_sb_block
, i
);
3735 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
3736 if (!sbi
->s_group_desc
[i
]) {
3737 ext4_msg(sb
, KERN_ERR
,
3738 "can't read group descriptor %d", i
);
3743 if (!ext4_check_descriptors(sb
, &first_not_zeroed
)) {
3744 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
3747 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
3748 if (!ext4_fill_flex_info(sb
)) {
3749 ext4_msg(sb
, KERN_ERR
,
3750 "unable to initialize "
3751 "flex_bg meta info!");
3755 sbi
->s_gdb_count
= db_count
;
3756 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
3757 spin_lock_init(&sbi
->s_next_gen_lock
);
3759 init_timer(&sbi
->s_err_report
);
3760 sbi
->s_err_report
.function
= print_daily_error_info
;
3761 sbi
->s_err_report
.data
= (unsigned long) sb
;
3763 err
= percpu_counter_init(&sbi
->s_freeclusters_counter
,
3764 ext4_count_free_clusters(sb
));
3766 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
3767 ext4_count_free_inodes(sb
));
3770 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
3771 ext4_count_dirs(sb
));
3774 err
= percpu_counter_init(&sbi
->s_dirtyclusters_counter
, 0);
3777 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
3782 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
3783 sbi
->s_max_writeback_mb_bump
= 128;
3784 sbi
->s_extent_max_zeroout_kb
= 32;
3787 * set up enough so that it can read an inode
3789 if (!test_opt(sb
, NOLOAD
) &&
3790 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
3791 sb
->s_op
= &ext4_sops
;
3793 sb
->s_op
= &ext4_nojournal_sops
;
3794 sb
->s_export_op
= &ext4_export_ops
;
3795 sb
->s_xattr
= ext4_xattr_handlers
;
3797 sb
->s_qcop
= &ext4_qctl_operations
;
3798 sb
->dq_op
= &ext4_quota_operations
;
3800 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
)) {
3801 /* Use qctl operations for hidden quota files. */
3802 sb
->s_qcop
= &ext4_qctl_sysfile_operations
;
3805 memcpy(sb
->s_uuid
, es
->s_uuid
, sizeof(es
->s_uuid
));
3807 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
3808 mutex_init(&sbi
->s_orphan_lock
);
3809 sbi
->s_resize_flags
= 0;
3813 needs_recovery
= (es
->s_last_orphan
!= 0 ||
3814 EXT4_HAS_INCOMPAT_FEATURE(sb
,
3815 EXT4_FEATURE_INCOMPAT_RECOVER
));
3817 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_MMP
) &&
3818 !(sb
->s_flags
& MS_RDONLY
))
3819 if (ext4_multi_mount_protect(sb
, le64_to_cpu(es
->s_mmp_block
)))
3823 * The first inode we look at is the journal inode. Don't try
3824 * root first: it may be modified in the journal!
3826 if (!test_opt(sb
, NOLOAD
) &&
3827 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
3828 if (ext4_load_journal(sb
, es
, journal_devnum
))
3830 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
3831 EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3832 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
3833 "suppressed and not mounted read-only");
3834 goto failed_mount_wq
;
3836 clear_opt(sb
, DATA_FLAGS
);
3837 sbi
->s_journal
= NULL
;
3842 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
) &&
3843 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
3844 JBD2_FEATURE_INCOMPAT_64BIT
)) {
3845 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
3846 goto failed_mount_wq
;
3849 if (!set_journal_csum_feature_set(sb
)) {
3850 ext4_msg(sb
, KERN_ERR
, "Failed to set journal checksum "
3852 goto failed_mount_wq
;
3855 /* We have now updated the journal if required, so we can
3856 * validate the data journaling mode. */
3857 switch (test_opt(sb
, DATA_FLAGS
)) {
3859 /* No mode set, assume a default based on the journal
3860 * capabilities: ORDERED_DATA if the journal can
3861 * cope, else JOURNAL_DATA
3863 if (jbd2_journal_check_available_features
3864 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
3865 set_opt(sb
, ORDERED_DATA
);
3867 set_opt(sb
, JOURNAL_DATA
);
3870 case EXT4_MOUNT_ORDERED_DATA
:
3871 case EXT4_MOUNT_WRITEBACK_DATA
:
3872 if (!jbd2_journal_check_available_features
3873 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
3874 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
3875 "requested data journaling mode");
3876 goto failed_mount_wq
;
3881 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
3883 sbi
->s_journal
->j_commit_callback
= ext4_journal_commit_callback
;
3886 * The journal may have updated the bg summary counts, so we
3887 * need to update the global counters.
3889 percpu_counter_set(&sbi
->s_freeclusters_counter
,
3890 ext4_count_free_clusters(sb
));
3891 percpu_counter_set(&sbi
->s_freeinodes_counter
,
3892 ext4_count_free_inodes(sb
));
3893 percpu_counter_set(&sbi
->s_dirs_counter
,
3894 ext4_count_dirs(sb
));
3895 percpu_counter_set(&sbi
->s_dirtyclusters_counter
, 0);
3899 * Get the # of file system overhead blocks from the
3900 * superblock if present.
3902 if (es
->s_overhead_clusters
)
3903 sbi
->s_overhead
= le32_to_cpu(es
->s_overhead_clusters
);
3905 ret
= ext4_calculate_overhead(sb
);
3907 goto failed_mount_wq
;
3911 * The maximum number of concurrent works can be high and
3912 * concurrency isn't really necessary. Limit it to 1.
3914 EXT4_SB(sb
)->dio_unwritten_wq
=
3915 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM
| WQ_UNBOUND
, 1);
3916 if (!EXT4_SB(sb
)->dio_unwritten_wq
) {
3917 printk(KERN_ERR
"EXT4-fs: failed to create DIO workqueue\n");
3918 goto failed_mount_wq
;
3922 * The jbd2_journal_load will have done any necessary log recovery,
3923 * so we can safely mount the rest of the filesystem now.
3926 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
3928 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
3929 ret
= PTR_ERR(root
);
3933 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
3934 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
3938 sb
->s_root
= d_make_root(root
);
3940 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
3945 if (ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
))
3946 sb
->s_flags
|= MS_RDONLY
;
3948 /* determine the minimum size of new large inodes, if present */
3949 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
3950 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
3951 EXT4_GOOD_OLD_INODE_SIZE
;
3952 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3953 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
3954 if (sbi
->s_want_extra_isize
<
3955 le16_to_cpu(es
->s_want_extra_isize
))
3956 sbi
->s_want_extra_isize
=
3957 le16_to_cpu(es
->s_want_extra_isize
);
3958 if (sbi
->s_want_extra_isize
<
3959 le16_to_cpu(es
->s_min_extra_isize
))
3960 sbi
->s_want_extra_isize
=
3961 le16_to_cpu(es
->s_min_extra_isize
);
3964 /* Check if enough inode space is available */
3965 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
3966 sbi
->s_inode_size
) {
3967 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
3968 EXT4_GOOD_OLD_INODE_SIZE
;
3969 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
3973 err
= ext4_setup_system_zone(sb
);
3975 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
3977 goto failed_mount4a
;
3981 err
= ext4_mb_init(sb
);
3983 ext4_msg(sb
, KERN_ERR
, "failed to initialize mballoc (%d)",
3988 err
= ext4_register_li_request(sb
, first_not_zeroed
);
3992 sbi
->s_kobj
.kset
= ext4_kset
;
3993 init_completion(&sbi
->s_kobj_unregister
);
3994 err
= kobject_init_and_add(&sbi
->s_kobj
, &ext4_ktype
, NULL
,
3999 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
4000 ext4_orphan_cleanup(sb
, es
);
4001 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
4002 if (needs_recovery
) {
4003 ext4_msg(sb
, KERN_INFO
, "recovery complete");
4004 ext4_mark_recovery_complete(sb
, es
);
4006 if (EXT4_SB(sb
)->s_journal
) {
4007 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
4008 descr
= " journalled data mode";
4009 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
4010 descr
= " ordered data mode";
4012 descr
= " writeback data mode";
4014 descr
= "out journal";
4017 /* Enable quota usage during mount. */
4018 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
) &&
4019 !(sb
->s_flags
& MS_RDONLY
)) {
4020 ret
= ext4_enable_quotas(sb
);
4024 #endif /* CONFIG_QUOTA */
4026 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s. "
4027 "Opts: %s%s%s", descr
, sbi
->s_es
->s_mount_opts
,
4028 *sbi
->s_es
->s_mount_opts
? "; " : "", orig_data
);
4030 if (es
->s_error_count
)
4031 mod_timer(&sbi
->s_err_report
, jiffies
+ 300*HZ
); /* 5 minutes */
4038 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
4042 ext4_unregister_li_request(sb
);
4044 ext4_mb_release(sb
);
4046 ext4_ext_release(sb
);
4047 ext4_release_system_zone(sb
);
4052 ext4_msg(sb
, KERN_ERR
, "mount failed");
4053 destroy_workqueue(EXT4_SB(sb
)->dio_unwritten_wq
);
4055 if (sbi
->s_journal
) {
4056 jbd2_journal_destroy(sbi
->s_journal
);
4057 sbi
->s_journal
= NULL
;
4060 del_timer(&sbi
->s_err_report
);
4061 if (sbi
->s_flex_groups
)
4062 ext4_kvfree(sbi
->s_flex_groups
);
4063 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
4064 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
4065 percpu_counter_destroy(&sbi
->s_dirs_counter
);
4066 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
4068 kthread_stop(sbi
->s_mmp_tsk
);
4070 for (i
= 0; i
< db_count
; i
++)
4071 brelse(sbi
->s_group_desc
[i
]);
4072 ext4_kvfree(sbi
->s_group_desc
);
4074 if (sbi
->s_chksum_driver
)
4075 crypto_free_shash(sbi
->s_chksum_driver
);
4077 remove_proc_entry("options", sbi
->s_proc
);
4078 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
4081 for (i
= 0; i
< MAXQUOTAS
; i
++)
4082 kfree(sbi
->s_qf_names
[i
]);
4084 ext4_blkdev_remove(sbi
);
4087 sb
->s_fs_info
= NULL
;
4088 kfree(sbi
->s_blockgroup_lock
);
4096 * Setup any per-fs journal parameters now. We'll do this both on
4097 * initial mount, once the journal has been initialised but before we've
4098 * done any recovery; and again on any subsequent remount.
4100 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
4102 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4104 journal
->j_commit_interval
= sbi
->s_commit_interval
;
4105 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
4106 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
4108 write_lock(&journal
->j_state_lock
);
4109 if (test_opt(sb
, BARRIER
))
4110 journal
->j_flags
|= JBD2_BARRIER
;
4112 journal
->j_flags
&= ~JBD2_BARRIER
;
4113 if (test_opt(sb
, DATA_ERR_ABORT
))
4114 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
4116 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
4117 write_unlock(&journal
->j_state_lock
);
4120 static journal_t
*ext4_get_journal(struct super_block
*sb
,
4121 unsigned int journal_inum
)
4123 struct inode
*journal_inode
;
4126 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4128 /* First, test for the existence of a valid inode on disk. Bad
4129 * things happen if we iget() an unused inode, as the subsequent
4130 * iput() will try to delete it. */
4132 journal_inode
= ext4_iget(sb
, journal_inum
);
4133 if (IS_ERR(journal_inode
)) {
4134 ext4_msg(sb
, KERN_ERR
, "no journal found");
4137 if (!journal_inode
->i_nlink
) {
4138 make_bad_inode(journal_inode
);
4139 iput(journal_inode
);
4140 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
4144 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4145 journal_inode
, journal_inode
->i_size
);
4146 if (!S_ISREG(journal_inode
->i_mode
)) {
4147 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
4148 iput(journal_inode
);
4152 journal
= jbd2_journal_init_inode(journal_inode
);
4154 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
4155 iput(journal_inode
);
4158 journal
->j_private
= sb
;
4159 ext4_init_journal_params(sb
, journal
);
4163 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
4166 struct buffer_head
*bh
;
4170 int hblock
, blocksize
;
4171 ext4_fsblk_t sb_block
;
4172 unsigned long offset
;
4173 struct ext4_super_block
*es
;
4174 struct block_device
*bdev
;
4176 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4178 bdev
= ext4_blkdev_get(j_dev
, sb
);
4182 blocksize
= sb
->s_blocksize
;
4183 hblock
= bdev_logical_block_size(bdev
);
4184 if (blocksize
< hblock
) {
4185 ext4_msg(sb
, KERN_ERR
,
4186 "blocksize too small for journal device");
4190 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
4191 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
4192 set_blocksize(bdev
, blocksize
);
4193 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
4194 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
4195 "external journal");
4199 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
4200 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
4201 !(le32_to_cpu(es
->s_feature_incompat
) &
4202 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
4203 ext4_msg(sb
, KERN_ERR
, "external journal has "
4209 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
4210 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
4215 len
= ext4_blocks_count(es
);
4216 start
= sb_block
+ 1;
4217 brelse(bh
); /* we're done with the superblock */
4219 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
4220 start
, len
, blocksize
);
4222 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
4225 journal
->j_private
= sb
;
4226 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
4227 wait_on_buffer(journal
->j_sb_buffer
);
4228 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
4229 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
4232 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
4233 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
4234 "user (unsupported) - %d",
4235 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
4238 EXT4_SB(sb
)->journal_bdev
= bdev
;
4239 ext4_init_journal_params(sb
, journal
);
4243 jbd2_journal_destroy(journal
);
4245 ext4_blkdev_put(bdev
);
4249 static int ext4_load_journal(struct super_block
*sb
,
4250 struct ext4_super_block
*es
,
4251 unsigned long journal_devnum
)
4254 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
4257 int really_read_only
;
4259 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4261 if (journal_devnum
&&
4262 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4263 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
4264 "numbers have changed");
4265 journal_dev
= new_decode_dev(journal_devnum
);
4267 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
4269 really_read_only
= bdev_read_only(sb
->s_bdev
);
4272 * Are we loading a blank journal or performing recovery after a
4273 * crash? For recovery, we need to check in advance whether we
4274 * can get read-write access to the device.
4276 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
4277 if (sb
->s_flags
& MS_RDONLY
) {
4278 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
4279 "required on readonly filesystem");
4280 if (really_read_only
) {
4281 ext4_msg(sb
, KERN_ERR
, "write access "
4282 "unavailable, cannot proceed");
4285 ext4_msg(sb
, KERN_INFO
, "write access will "
4286 "be enabled during recovery");
4290 if (journal_inum
&& journal_dev
) {
4291 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
4292 "and inode journals!");
4297 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
4300 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
4304 if (!(journal
->j_flags
& JBD2_BARRIER
))
4305 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
4307 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
4308 err
= jbd2_journal_wipe(journal
, !really_read_only
);
4310 char *save
= kmalloc(EXT4_S_ERR_LEN
, GFP_KERNEL
);
4312 memcpy(save
, ((char *) es
) +
4313 EXT4_S_ERR_START
, EXT4_S_ERR_LEN
);
4314 err
= jbd2_journal_load(journal
);
4316 memcpy(((char *) es
) + EXT4_S_ERR_START
,
4317 save
, EXT4_S_ERR_LEN
);
4322 ext4_msg(sb
, KERN_ERR
, "error loading journal");
4323 jbd2_journal_destroy(journal
);
4327 EXT4_SB(sb
)->s_journal
= journal
;
4328 ext4_clear_journal_err(sb
, es
);
4330 if (!really_read_only
&& journal_devnum
&&
4331 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4332 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
4334 /* Make sure we flush the recovery flag to disk. */
4335 ext4_commit_super(sb
, 1);
4341 static int ext4_commit_super(struct super_block
*sb
, int sync
)
4343 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
4344 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
4347 if (!sbh
|| block_device_ejected(sb
))
4349 if (buffer_write_io_error(sbh
)) {
4351 * Oh, dear. A previous attempt to write the
4352 * superblock failed. This could happen because the
4353 * USB device was yanked out. Or it could happen to
4354 * be a transient write error and maybe the block will
4355 * be remapped. Nothing we can do but to retry the
4356 * write and hope for the best.
4358 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
4359 "superblock detected");
4360 clear_buffer_write_io_error(sbh
);
4361 set_buffer_uptodate(sbh
);
4364 * If the file system is mounted read-only, don't update the
4365 * superblock write time. This avoids updating the superblock
4366 * write time when we are mounting the root file system
4367 * read/only but we need to replay the journal; at that point,
4368 * for people who are east of GMT and who make their clock
4369 * tick in localtime for Windows bug-for-bug compatibility,
4370 * the clock is set in the future, and this will cause e2fsck
4371 * to complain and force a full file system check.
4373 if (!(sb
->s_flags
& MS_RDONLY
))
4374 es
->s_wtime
= cpu_to_le32(get_seconds());
4375 if (sb
->s_bdev
->bd_part
)
4376 es
->s_kbytes_written
=
4377 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
4378 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
4379 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
4381 es
->s_kbytes_written
=
4382 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
);
4383 ext4_free_blocks_count_set(es
,
4384 EXT4_C2B(EXT4_SB(sb
), percpu_counter_sum_positive(
4385 &EXT4_SB(sb
)->s_freeclusters_counter
)));
4386 es
->s_free_inodes_count
=
4387 cpu_to_le32(percpu_counter_sum_positive(
4388 &EXT4_SB(sb
)->s_freeinodes_counter
));
4389 BUFFER_TRACE(sbh
, "marking dirty");
4390 ext4_superblock_csum_set(sb
, es
);
4391 mark_buffer_dirty(sbh
);
4393 error
= sync_dirty_buffer(sbh
);
4397 error
= buffer_write_io_error(sbh
);
4399 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
4401 clear_buffer_write_io_error(sbh
);
4402 set_buffer_uptodate(sbh
);
4409 * Have we just finished recovery? If so, and if we are mounting (or
4410 * remounting) the filesystem readonly, then we will end up with a
4411 * consistent fs on disk. Record that fact.
4413 static void ext4_mark_recovery_complete(struct super_block
*sb
,
4414 struct ext4_super_block
*es
)
4416 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
4418 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
4419 BUG_ON(journal
!= NULL
);
4422 jbd2_journal_lock_updates(journal
);
4423 if (jbd2_journal_flush(journal
) < 0)
4426 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
4427 sb
->s_flags
& MS_RDONLY
) {
4428 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4429 ext4_commit_super(sb
, 1);
4433 jbd2_journal_unlock_updates(journal
);
4437 * If we are mounting (or read-write remounting) a filesystem whose journal
4438 * has recorded an error from a previous lifetime, move that error to the
4439 * main filesystem now.
4441 static void ext4_clear_journal_err(struct super_block
*sb
,
4442 struct ext4_super_block
*es
)
4448 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4450 journal
= EXT4_SB(sb
)->s_journal
;
4453 * Now check for any error status which may have been recorded in the
4454 * journal by a prior ext4_error() or ext4_abort()
4457 j_errno
= jbd2_journal_errno(journal
);
4461 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
4462 ext4_warning(sb
, "Filesystem error recorded "
4463 "from previous mount: %s", errstr
);
4464 ext4_warning(sb
, "Marking fs in need of filesystem check.");
4466 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
4467 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
4468 ext4_commit_super(sb
, 1);
4470 jbd2_journal_clear_err(journal
);
4471 jbd2_journal_update_sb_errno(journal
);
4476 * Force the running and committing transactions to commit,
4477 * and wait on the commit.
4479 int ext4_force_commit(struct super_block
*sb
)
4484 if (sb
->s_flags
& MS_RDONLY
)
4487 journal
= EXT4_SB(sb
)->s_journal
;
4489 ret
= ext4_journal_force_commit(journal
);
4494 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
4498 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4500 trace_ext4_sync_fs(sb
, wait
);
4501 flush_workqueue(sbi
->dio_unwritten_wq
);
4503 * Writeback quota in non-journalled quota case - journalled quota has
4506 dquot_writeback_dquots(sb
, -1);
4507 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
4509 jbd2_log_wait_commit(sbi
->s_journal
, target
);
4515 * LVM calls this function before a (read-only) snapshot is created. This
4516 * gives us a chance to flush the journal completely and mark the fs clean.
4518 * Note that only this function cannot bring a filesystem to be in a clean
4519 * state independently. It relies on upper layer to stop all data & metadata
4522 static int ext4_freeze(struct super_block
*sb
)
4527 if (sb
->s_flags
& MS_RDONLY
)
4530 journal
= EXT4_SB(sb
)->s_journal
;
4532 /* Now we set up the journal barrier. */
4533 jbd2_journal_lock_updates(journal
);
4536 * Don't clear the needs_recovery flag if we failed to flush
4539 error
= jbd2_journal_flush(journal
);
4543 /* Journal blocked and flushed, clear needs_recovery flag. */
4544 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4545 error
= ext4_commit_super(sb
, 1);
4547 /* we rely on upper layer to stop further updates */
4548 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
4553 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4554 * flag here, even though the filesystem is not technically dirty yet.
4556 static int ext4_unfreeze(struct super_block
*sb
)
4558 if (sb
->s_flags
& MS_RDONLY
)
4561 /* Reset the needs_recovery flag before the fs is unlocked. */
4562 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4563 ext4_commit_super(sb
, 1);
4568 * Structure to save mount options for ext4_remount's benefit
4570 struct ext4_mount_options
{
4571 unsigned long s_mount_opt
;
4572 unsigned long s_mount_opt2
;
4575 unsigned long s_commit_interval
;
4576 u32 s_min_batch_time
, s_max_batch_time
;
4579 char *s_qf_names
[MAXQUOTAS
];
4583 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
4585 struct ext4_super_block
*es
;
4586 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4587 unsigned long old_sb_flags
;
4588 struct ext4_mount_options old_opts
;
4589 int enable_quota
= 0;
4591 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
4596 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
4598 /* Store the original options */
4599 old_sb_flags
= sb
->s_flags
;
4600 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
4601 old_opts
.s_mount_opt2
= sbi
->s_mount_opt2
;
4602 old_opts
.s_resuid
= sbi
->s_resuid
;
4603 old_opts
.s_resgid
= sbi
->s_resgid
;
4604 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
4605 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
4606 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
4608 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
4609 for (i
= 0; i
< MAXQUOTAS
; i
++)
4610 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
4612 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
4613 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
4616 * Allow the "check" option to be passed as a remount option.
4618 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
, 1)) {
4623 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
4624 ext4_abort(sb
, "Abort forced by user");
4626 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
4627 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
4631 if (sbi
->s_journal
) {
4632 ext4_init_journal_params(sb
, sbi
->s_journal
);
4633 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
4636 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
)) {
4637 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
4642 if (*flags
& MS_RDONLY
) {
4643 err
= dquot_suspend(sb
, -1);
4648 * First of all, the unconditional stuff we have to do
4649 * to disable replay of the journal when we next remount
4651 sb
->s_flags
|= MS_RDONLY
;
4654 * OK, test if we are remounting a valid rw partition
4655 * readonly, and if so set the rdonly flag and then
4656 * mark the partition as valid again.
4658 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
4659 (sbi
->s_mount_state
& EXT4_VALID_FS
))
4660 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
4663 ext4_mark_recovery_complete(sb
, es
);
4665 /* Make sure we can mount this feature set readwrite */
4666 if (!ext4_feature_set_ok(sb
, 0)) {
4671 * Make sure the group descriptor checksums
4672 * are sane. If they aren't, refuse to remount r/w.
4674 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
4675 struct ext4_group_desc
*gdp
=
4676 ext4_get_group_desc(sb
, g
, NULL
);
4678 if (!ext4_group_desc_csum_verify(sb
, g
, gdp
)) {
4679 ext4_msg(sb
, KERN_ERR
,
4680 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4681 g
, le16_to_cpu(ext4_group_desc_csum(sbi
, g
, gdp
)),
4682 le16_to_cpu(gdp
->bg_checksum
));
4689 * If we have an unprocessed orphan list hanging
4690 * around from a previously readonly bdev mount,
4691 * require a full umount/remount for now.
4693 if (es
->s_last_orphan
) {
4694 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
4695 "remount RDWR because of unprocessed "
4696 "orphan inode list. Please "
4697 "umount/remount instead");
4703 * Mounting a RDONLY partition read-write, so reread
4704 * and store the current valid flag. (It may have
4705 * been changed by e2fsck since we originally mounted
4709 ext4_clear_journal_err(sb
, es
);
4710 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
4711 if (!ext4_setup_super(sb
, es
, 0))
4712 sb
->s_flags
&= ~MS_RDONLY
;
4713 if (EXT4_HAS_INCOMPAT_FEATURE(sb
,
4714 EXT4_FEATURE_INCOMPAT_MMP
))
4715 if (ext4_multi_mount_protect(sb
,
4716 le64_to_cpu(es
->s_mmp_block
))) {
4725 * Reinitialize lazy itable initialization thread based on
4728 if ((sb
->s_flags
& MS_RDONLY
) || !test_opt(sb
, INIT_INODE_TABLE
))
4729 ext4_unregister_li_request(sb
);
4731 ext4_group_t first_not_zeroed
;
4732 first_not_zeroed
= ext4_has_uninit_itable(sb
);
4733 ext4_register_li_request(sb
, first_not_zeroed
);
4736 ext4_setup_system_zone(sb
);
4737 if (sbi
->s_journal
== NULL
)
4738 ext4_commit_super(sb
, 1);
4741 /* Release old quota file names */
4742 for (i
= 0; i
< MAXQUOTAS
; i
++)
4743 if (old_opts
.s_qf_names
[i
] &&
4744 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
4745 kfree(old_opts
.s_qf_names
[i
]);
4747 if (sb_any_quota_suspended(sb
))
4748 dquot_resume(sb
, -1);
4749 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
4750 EXT4_FEATURE_RO_COMPAT_QUOTA
)) {
4751 err
= ext4_enable_quotas(sb
);
4758 ext4_msg(sb
, KERN_INFO
, "re-mounted. Opts: %s", orig_data
);
4763 sb
->s_flags
= old_sb_flags
;
4764 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
4765 sbi
->s_mount_opt2
= old_opts
.s_mount_opt2
;
4766 sbi
->s_resuid
= old_opts
.s_resuid
;
4767 sbi
->s_resgid
= old_opts
.s_resgid
;
4768 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
4769 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
4770 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
4772 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
4773 for (i
= 0; i
< MAXQUOTAS
; i
++) {
4774 if (sbi
->s_qf_names
[i
] &&
4775 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
4776 kfree(sbi
->s_qf_names
[i
]);
4777 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
4784 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
4786 struct super_block
*sb
= dentry
->d_sb
;
4787 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4788 struct ext4_super_block
*es
= sbi
->s_es
;
4789 ext4_fsblk_t overhead
= 0;
4793 if (!test_opt(sb
, MINIX_DF
))
4794 overhead
= sbi
->s_overhead
;
4796 buf
->f_type
= EXT4_SUPER_MAGIC
;
4797 buf
->f_bsize
= sb
->s_blocksize
;
4798 buf
->f_blocks
= ext4_blocks_count(es
) - EXT4_C2B(sbi
, sbi
->s_overhead
);
4799 bfree
= percpu_counter_sum_positive(&sbi
->s_freeclusters_counter
) -
4800 percpu_counter_sum_positive(&sbi
->s_dirtyclusters_counter
);
4801 /* prevent underflow in case that few free space is available */
4802 buf
->f_bfree
= EXT4_C2B(sbi
, max_t(s64
, bfree
, 0));
4803 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
4804 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
4806 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
4807 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
4808 buf
->f_namelen
= EXT4_NAME_LEN
;
4809 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
4810 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
4811 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
4812 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
4817 /* Helper function for writing quotas on sync - we need to start transaction
4818 * before quota file is locked for write. Otherwise the are possible deadlocks:
4819 * Process 1 Process 2
4820 * ext4_create() quota_sync()
4821 * jbd2_journal_start() write_dquot()
4822 * dquot_initialize() down(dqio_mutex)
4823 * down(dqio_mutex) jbd2_journal_start()
4829 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
4831 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_type
];
4834 static int ext4_write_dquot(struct dquot
*dquot
)
4838 struct inode
*inode
;
4840 inode
= dquot_to_inode(dquot
);
4841 handle
= ext4_journal_start(inode
,
4842 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
4844 return PTR_ERR(handle
);
4845 ret
= dquot_commit(dquot
);
4846 err
= ext4_journal_stop(handle
);
4852 static int ext4_acquire_dquot(struct dquot
*dquot
)
4857 handle
= ext4_journal_start(dquot_to_inode(dquot
),
4858 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
4860 return PTR_ERR(handle
);
4861 ret
= dquot_acquire(dquot
);
4862 err
= ext4_journal_stop(handle
);
4868 static int ext4_release_dquot(struct dquot
*dquot
)
4873 handle
= ext4_journal_start(dquot_to_inode(dquot
),
4874 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
4875 if (IS_ERR(handle
)) {
4876 /* Release dquot anyway to avoid endless cycle in dqput() */
4877 dquot_release(dquot
);
4878 return PTR_ERR(handle
);
4880 ret
= dquot_release(dquot
);
4881 err
= ext4_journal_stop(handle
);
4887 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
4889 /* Are we journaling quotas? */
4890 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
4891 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
4892 dquot_mark_dquot_dirty(dquot
);
4893 return ext4_write_dquot(dquot
);
4895 return dquot_mark_dquot_dirty(dquot
);
4899 static int ext4_write_info(struct super_block
*sb
, int type
)
4904 /* Data block + inode block */
4905 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
4907 return PTR_ERR(handle
);
4908 ret
= dquot_commit_info(sb
, type
);
4909 err
= ext4_journal_stop(handle
);
4916 * Turn on quotas during mount time - we need to find
4917 * the quota file and such...
4919 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
4921 return dquot_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
4922 EXT4_SB(sb
)->s_jquota_fmt
, type
);
4926 * Standard function to be called on quota_on
4928 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
4933 if (!test_opt(sb
, QUOTA
))
4936 /* Quotafile not on the same filesystem? */
4937 if (path
->dentry
->d_sb
!= sb
)
4939 /* Journaling quota? */
4940 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
4941 /* Quotafile not in fs root? */
4942 if (path
->dentry
->d_parent
!= sb
->s_root
)
4943 ext4_msg(sb
, KERN_WARNING
,
4944 "Quota file not on filesystem root. "
4945 "Journaled quota will not work");
4949 * When we journal data on quota file, we have to flush journal to see
4950 * all updates to the file when we bypass pagecache...
4952 if (EXT4_SB(sb
)->s_journal
&&
4953 ext4_should_journal_data(path
->dentry
->d_inode
)) {
4955 * We don't need to lock updates but journal_flush() could
4956 * otherwise be livelocked...
4958 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
4959 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
4960 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
4965 return dquot_quota_on(sb
, type
, format_id
, path
);
4968 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
4972 struct inode
*qf_inode
;
4973 unsigned long qf_inums
[MAXQUOTAS
] = {
4974 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
4975 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
)
4978 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
));
4980 if (!qf_inums
[type
])
4983 qf_inode
= ext4_iget(sb
, qf_inums
[type
]);
4984 if (IS_ERR(qf_inode
)) {
4985 ext4_error(sb
, "Bad quota inode # %lu", qf_inums
[type
]);
4986 return PTR_ERR(qf_inode
);
4989 err
= dquot_enable(qf_inode
, type
, format_id
, flags
);
4995 /* Enable usage tracking for all quota types. */
4996 static int ext4_enable_quotas(struct super_block
*sb
)
4999 unsigned long qf_inums
[MAXQUOTAS
] = {
5000 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
5001 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
)
5004 sb_dqopt(sb
)->flags
|= DQUOT_QUOTA_SYS_FILE
;
5005 for (type
= 0; type
< MAXQUOTAS
; type
++) {
5006 if (qf_inums
[type
]) {
5007 err
= ext4_quota_enable(sb
, type
, QFMT_VFS_V1
,
5008 DQUOT_USAGE_ENABLED
);
5011 "Failed to enable quota (type=%d) "
5012 "tracking. Please run e2fsck to fix.",
5022 * quota_on function that is used when QUOTA feature is set.
5024 static int ext4_quota_on_sysfile(struct super_block
*sb
, int type
,
5027 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
))
5031 * USAGE was enabled at mount time. Only need to enable LIMITS now.
5033 return ext4_quota_enable(sb
, type
, format_id
, DQUOT_LIMITS_ENABLED
);
5036 static int ext4_quota_off(struct super_block
*sb
, int type
)
5038 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5041 /* Force all delayed allocation blocks to be allocated.
5042 * Caller already holds s_umount sem */
5043 if (test_opt(sb
, DELALLOC
))
5044 sync_filesystem(sb
);
5049 /* Update modification times of quota files when userspace can
5050 * start looking at them */
5051 handle
= ext4_journal_start(inode
, 1);
5054 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
5055 ext4_mark_inode_dirty(handle
, inode
);
5056 ext4_journal_stop(handle
);
5059 return dquot_quota_off(sb
, type
);
5063 * quota_off function that is used when QUOTA feature is set.
5065 static int ext4_quota_off_sysfile(struct super_block
*sb
, int type
)
5067 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
))
5070 /* Disable only the limits. */
5071 return dquot_disable(sb
, type
, DQUOT_LIMITS_ENABLED
);
5074 /* Read data from quotafile - avoid pagecache and such because we cannot afford
5075 * acquiring the locks... As quota files are never truncated and quota code
5076 * itself serializes the operations (and no one else should touch the files)
5077 * we don't have to be afraid of races */
5078 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
5079 size_t len
, loff_t off
)
5081 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5082 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5084 int offset
= off
& (sb
->s_blocksize
- 1);
5087 struct buffer_head
*bh
;
5088 loff_t i_size
= i_size_read(inode
);
5092 if (off
+len
> i_size
)
5095 while (toread
> 0) {
5096 tocopy
= sb
->s_blocksize
- offset
< toread
?
5097 sb
->s_blocksize
- offset
: toread
;
5098 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
5101 if (!bh
) /* A hole? */
5102 memset(data
, 0, tocopy
);
5104 memcpy(data
, bh
->b_data
+offset
, tocopy
);
5114 /* Write to quotafile (we know the transaction is already started and has
5115 * enough credits) */
5116 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
5117 const char *data
, size_t len
, loff_t off
)
5119 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5120 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5122 int offset
= off
& (sb
->s_blocksize
- 1);
5123 struct buffer_head
*bh
;
5124 handle_t
*handle
= journal_current_handle();
5126 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
5127 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5128 " cancelled because transaction is not started",
5129 (unsigned long long)off
, (unsigned long long)len
);
5133 * Since we account only one data block in transaction credits,
5134 * then it is impossible to cross a block boundary.
5136 if (sb
->s_blocksize
- offset
< len
) {
5137 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5138 " cancelled because not block aligned",
5139 (unsigned long long)off
, (unsigned long long)len
);
5143 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
5146 err
= ext4_journal_get_write_access(handle
, bh
);
5152 memcpy(bh
->b_data
+offset
, data
, len
);
5153 flush_dcache_page(bh
->b_page
);
5155 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
5160 if (inode
->i_size
< off
+ len
) {
5161 i_size_write(inode
, off
+ len
);
5162 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
5163 ext4_mark_inode_dirty(handle
, inode
);
5170 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
5171 const char *dev_name
, void *data
)
5173 return mount_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
);
5176 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5177 static inline void register_as_ext2(void)
5179 int err
= register_filesystem(&ext2_fs_type
);
5182 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
5185 static inline void unregister_as_ext2(void)
5187 unregister_filesystem(&ext2_fs_type
);
5190 static inline int ext2_feature_set_ok(struct super_block
*sb
)
5192 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT2_FEATURE_INCOMPAT_SUPP
))
5194 if (sb
->s_flags
& MS_RDONLY
)
5196 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT2_FEATURE_RO_COMPAT_SUPP
))
5200 MODULE_ALIAS("ext2");
5202 static inline void register_as_ext2(void) { }
5203 static inline void unregister_as_ext2(void) { }
5204 static inline int ext2_feature_set_ok(struct super_block
*sb
) { return 0; }
5207 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5208 static inline void register_as_ext3(void)
5210 int err
= register_filesystem(&ext3_fs_type
);
5213 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
5216 static inline void unregister_as_ext3(void)
5218 unregister_filesystem(&ext3_fs_type
);
5221 static inline int ext3_feature_set_ok(struct super_block
*sb
)
5223 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT3_FEATURE_INCOMPAT_SUPP
))
5225 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
5227 if (sb
->s_flags
& MS_RDONLY
)
5229 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT3_FEATURE_RO_COMPAT_SUPP
))
5233 MODULE_ALIAS("ext3");
5235 static inline void register_as_ext3(void) { }
5236 static inline void unregister_as_ext3(void) { }
5237 static inline int ext3_feature_set_ok(struct super_block
*sb
) { return 0; }
5240 static struct file_system_type ext4_fs_type
= {
5241 .owner
= THIS_MODULE
,
5243 .mount
= ext4_mount
,
5244 .kill_sb
= kill_block_super
,
5245 .fs_flags
= FS_REQUIRES_DEV
,
5248 static int __init
ext4_init_feat_adverts(void)
5250 struct ext4_features
*ef
;
5253 ef
= kzalloc(sizeof(struct ext4_features
), GFP_KERNEL
);
5257 ef
->f_kobj
.kset
= ext4_kset
;
5258 init_completion(&ef
->f_kobj_unregister
);
5259 ret
= kobject_init_and_add(&ef
->f_kobj
, &ext4_feat_ktype
, NULL
,
5272 static void ext4_exit_feat_adverts(void)
5274 kobject_put(&ext4_feat
->f_kobj
);
5275 wait_for_completion(&ext4_feat
->f_kobj_unregister
);
5279 /* Shared across all ext4 file systems */
5280 wait_queue_head_t ext4__ioend_wq
[EXT4_WQ_HASH_SZ
];
5281 struct mutex ext4__aio_mutex
[EXT4_WQ_HASH_SZ
];
5283 static int __init
ext4_init_fs(void)
5287 ext4_li_info
= NULL
;
5288 mutex_init(&ext4_li_mtx
);
5290 ext4_check_flag_values();
5292 for (i
= 0; i
< EXT4_WQ_HASH_SZ
; i
++) {
5293 mutex_init(&ext4__aio_mutex
[i
]);
5294 init_waitqueue_head(&ext4__ioend_wq
[i
]);
5297 err
= ext4_init_pageio();
5300 err
= ext4_init_system_zone();
5303 ext4_kset
= kset_create_and_add("ext4", NULL
, fs_kobj
);
5308 ext4_proc_root
= proc_mkdir("fs/ext4", NULL
);
5310 err
= ext4_init_feat_adverts();
5314 err
= ext4_init_mballoc();
5318 err
= ext4_init_xattr();
5321 err
= init_inodecache();
5326 err
= register_filesystem(&ext4_fs_type
);
5332 unregister_as_ext2();
5333 unregister_as_ext3();
5334 destroy_inodecache();
5338 ext4_exit_mballoc();
5340 ext4_exit_feat_adverts();
5343 remove_proc_entry("fs/ext4", NULL
);
5344 kset_unregister(ext4_kset
);
5346 ext4_exit_system_zone();
5352 static void __exit
ext4_exit_fs(void)
5354 ext4_destroy_lazyinit_thread();
5355 unregister_as_ext2();
5356 unregister_as_ext3();
5357 unregister_filesystem(&ext4_fs_type
);
5358 destroy_inodecache();
5360 ext4_exit_mballoc();
5361 ext4_exit_feat_adverts();
5362 remove_proc_entry("fs/ext4", NULL
);
5363 kset_unregister(ext4_kset
);
5364 ext4_exit_system_zone();
5368 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5369 MODULE_DESCRIPTION("Fourth Extended Filesystem");
5370 MODULE_LICENSE("GPL");
5371 module_init(ext4_init_fs
)
5372 module_exit(ext4_exit_fs
)