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/slab.h>
25 #include <linux/init.h>
26 #include <linux/blkdev.h>
27 #include <linux/backing-dev.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/ctype.h>
38 #include <linux/log2.h>
39 #include <linux/crc16.h>
40 #include <linux/dax.h>
41 #include <linux/cleancache.h>
42 #include <linux/uaccess.h>
44 #include <linux/kthread.h>
45 #include <linux/freezer.h>
48 #include "ext4_extents.h" /* Needed for trace points definition */
49 #include "ext4_jbd2.h"
55 #define CREATE_TRACE_POINTS
56 #include <trace/events/ext4.h>
58 static struct ext4_lazy_init
*ext4_li_info
;
59 static struct mutex ext4_li_mtx
;
60 static struct ratelimit_state ext4_mount_msg_ratelimit
;
62 static int ext4_load_journal(struct super_block
*, struct ext4_super_block
*,
63 unsigned long journal_devnum
);
64 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
);
65 static int ext4_commit_super(struct super_block
*sb
, int sync
);
66 static void ext4_mark_recovery_complete(struct super_block
*sb
,
67 struct ext4_super_block
*es
);
68 static void ext4_clear_journal_err(struct super_block
*sb
,
69 struct ext4_super_block
*es
);
70 static int ext4_sync_fs(struct super_block
*sb
, int wait
);
71 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
);
72 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
);
73 static int ext4_unfreeze(struct super_block
*sb
);
74 static int ext4_freeze(struct super_block
*sb
);
75 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
76 const char *dev_name
, void *data
);
77 static inline int ext2_feature_set_ok(struct super_block
*sb
);
78 static inline int ext3_feature_set_ok(struct super_block
*sb
);
79 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
);
80 static void ext4_destroy_lazyinit_thread(void);
81 static void ext4_unregister_li_request(struct super_block
*sb
);
82 static void ext4_clear_request_list(void);
83 static struct inode
*ext4_get_journal_inode(struct super_block
*sb
,
84 unsigned int journal_inum
);
89 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
90 * i_mmap_rwsem (inode->i_mmap_rwsem)!
93 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
94 * page lock -> i_data_sem (rw)
96 * buffered write path:
97 * sb_start_write -> i_mutex -> mmap_sem
98 * sb_start_write -> i_mutex -> transaction start -> page lock ->
102 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
103 * i_mmap_rwsem (w) -> page lock
104 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
105 * transaction start -> i_data_sem (rw)
108 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> mmap_sem
109 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) ->
110 * transaction start -> i_data_sem (rw)
113 * transaction start -> page lock(s) -> i_data_sem (rw)
116 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
117 static struct file_system_type ext2_fs_type
= {
118 .owner
= THIS_MODULE
,
121 .kill_sb
= kill_block_super
,
122 .fs_flags
= FS_REQUIRES_DEV
,
124 MODULE_ALIAS_FS("ext2");
125 MODULE_ALIAS("ext2");
126 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
128 #define IS_EXT2_SB(sb) (0)
132 static struct file_system_type ext3_fs_type
= {
133 .owner
= THIS_MODULE
,
136 .kill_sb
= kill_block_super
,
137 .fs_flags
= FS_REQUIRES_DEV
,
139 MODULE_ALIAS_FS("ext3");
140 MODULE_ALIAS("ext3");
141 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
143 static int ext4_verify_csum_type(struct super_block
*sb
,
144 struct ext4_super_block
*es
)
146 if (!ext4_has_feature_metadata_csum(sb
))
149 return es
->s_checksum_type
== EXT4_CRC32C_CHKSUM
;
152 static __le32
ext4_superblock_csum(struct super_block
*sb
,
153 struct ext4_super_block
*es
)
155 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
156 int offset
= offsetof(struct ext4_super_block
, s_checksum
);
159 csum
= ext4_chksum(sbi
, ~0, (char *)es
, offset
);
161 return cpu_to_le32(csum
);
164 static int ext4_superblock_csum_verify(struct super_block
*sb
,
165 struct ext4_super_block
*es
)
167 if (!ext4_has_metadata_csum(sb
))
170 return es
->s_checksum
== ext4_superblock_csum(sb
, es
);
173 void ext4_superblock_csum_set(struct super_block
*sb
)
175 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
177 if (!ext4_has_metadata_csum(sb
))
180 es
->s_checksum
= ext4_superblock_csum(sb
, es
);
183 void *ext4_kvmalloc(size_t size
, gfp_t flags
)
187 ret
= kmalloc(size
, flags
| __GFP_NOWARN
);
189 ret
= __vmalloc(size
, flags
, PAGE_KERNEL
);
193 void *ext4_kvzalloc(size_t size
, gfp_t flags
)
197 ret
= kzalloc(size
, flags
| __GFP_NOWARN
);
199 ret
= __vmalloc(size
, flags
| __GFP_ZERO
, PAGE_KERNEL
);
203 ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
204 struct ext4_group_desc
*bg
)
206 return le32_to_cpu(bg
->bg_block_bitmap_lo
) |
207 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
208 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
211 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
212 struct ext4_group_desc
*bg
)
214 return le32_to_cpu(bg
->bg_inode_bitmap_lo
) |
215 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
216 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
219 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
220 struct ext4_group_desc
*bg
)
222 return le32_to_cpu(bg
->bg_inode_table_lo
) |
223 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
224 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
227 __u32
ext4_free_group_clusters(struct super_block
*sb
,
228 struct ext4_group_desc
*bg
)
230 return le16_to_cpu(bg
->bg_free_blocks_count_lo
) |
231 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
232 (__u32
)le16_to_cpu(bg
->bg_free_blocks_count_hi
) << 16 : 0);
235 __u32
ext4_free_inodes_count(struct super_block
*sb
,
236 struct ext4_group_desc
*bg
)
238 return le16_to_cpu(bg
->bg_free_inodes_count_lo
) |
239 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
240 (__u32
)le16_to_cpu(bg
->bg_free_inodes_count_hi
) << 16 : 0);
243 __u32
ext4_used_dirs_count(struct super_block
*sb
,
244 struct ext4_group_desc
*bg
)
246 return le16_to_cpu(bg
->bg_used_dirs_count_lo
) |
247 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
248 (__u32
)le16_to_cpu(bg
->bg_used_dirs_count_hi
) << 16 : 0);
251 __u32
ext4_itable_unused_count(struct super_block
*sb
,
252 struct ext4_group_desc
*bg
)
254 return le16_to_cpu(bg
->bg_itable_unused_lo
) |
255 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
256 (__u32
)le16_to_cpu(bg
->bg_itable_unused_hi
) << 16 : 0);
259 void ext4_block_bitmap_set(struct super_block
*sb
,
260 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
262 bg
->bg_block_bitmap_lo
= cpu_to_le32((u32
)blk
);
263 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
264 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
267 void ext4_inode_bitmap_set(struct super_block
*sb
,
268 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
270 bg
->bg_inode_bitmap_lo
= cpu_to_le32((u32
)blk
);
271 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
272 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
275 void ext4_inode_table_set(struct super_block
*sb
,
276 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
278 bg
->bg_inode_table_lo
= cpu_to_le32((u32
)blk
);
279 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
280 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
283 void ext4_free_group_clusters_set(struct super_block
*sb
,
284 struct ext4_group_desc
*bg
, __u32 count
)
286 bg
->bg_free_blocks_count_lo
= cpu_to_le16((__u16
)count
);
287 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
288 bg
->bg_free_blocks_count_hi
= cpu_to_le16(count
>> 16);
291 void ext4_free_inodes_set(struct super_block
*sb
,
292 struct ext4_group_desc
*bg
, __u32 count
)
294 bg
->bg_free_inodes_count_lo
= cpu_to_le16((__u16
)count
);
295 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
296 bg
->bg_free_inodes_count_hi
= cpu_to_le16(count
>> 16);
299 void ext4_used_dirs_set(struct super_block
*sb
,
300 struct ext4_group_desc
*bg
, __u32 count
)
302 bg
->bg_used_dirs_count_lo
= cpu_to_le16((__u16
)count
);
303 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
304 bg
->bg_used_dirs_count_hi
= cpu_to_le16(count
>> 16);
307 void ext4_itable_unused_set(struct super_block
*sb
,
308 struct ext4_group_desc
*bg
, __u32 count
)
310 bg
->bg_itable_unused_lo
= cpu_to_le16((__u16
)count
);
311 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
312 bg
->bg_itable_unused_hi
= cpu_to_le16(count
>> 16);
316 static void __save_error_info(struct super_block
*sb
, const char *func
,
319 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
321 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
322 if (bdev_read_only(sb
->s_bdev
))
324 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
325 es
->s_last_error_time
= cpu_to_le32(get_seconds());
326 strncpy(es
->s_last_error_func
, func
, sizeof(es
->s_last_error_func
));
327 es
->s_last_error_line
= cpu_to_le32(line
);
328 if (!es
->s_first_error_time
) {
329 es
->s_first_error_time
= es
->s_last_error_time
;
330 strncpy(es
->s_first_error_func
, func
,
331 sizeof(es
->s_first_error_func
));
332 es
->s_first_error_line
= cpu_to_le32(line
);
333 es
->s_first_error_ino
= es
->s_last_error_ino
;
334 es
->s_first_error_block
= es
->s_last_error_block
;
337 * Start the daily error reporting function if it hasn't been
340 if (!es
->s_error_count
)
341 mod_timer(&EXT4_SB(sb
)->s_err_report
, jiffies
+ 24*60*60*HZ
);
342 le32_add_cpu(&es
->s_error_count
, 1);
345 static void save_error_info(struct super_block
*sb
, const char *func
,
348 __save_error_info(sb
, func
, line
);
349 ext4_commit_super(sb
, 1);
353 * The del_gendisk() function uninitializes the disk-specific data
354 * structures, including the bdi structure, without telling anyone
355 * else. Once this happens, any attempt to call mark_buffer_dirty()
356 * (for example, by ext4_commit_super), will cause a kernel OOPS.
357 * This is a kludge to prevent these oops until we can put in a proper
358 * hook in del_gendisk() to inform the VFS and file system layers.
360 static int block_device_ejected(struct super_block
*sb
)
362 struct inode
*bd_inode
= sb
->s_bdev
->bd_inode
;
363 struct backing_dev_info
*bdi
= inode_to_bdi(bd_inode
);
365 return bdi
->dev
== NULL
;
368 static void ext4_journal_commit_callback(journal_t
*journal
, transaction_t
*txn
)
370 struct super_block
*sb
= journal
->j_private
;
371 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
372 int error
= is_journal_aborted(journal
);
373 struct ext4_journal_cb_entry
*jce
;
375 BUG_ON(txn
->t_state
== T_FINISHED
);
376 spin_lock(&sbi
->s_md_lock
);
377 while (!list_empty(&txn
->t_private_list
)) {
378 jce
= list_entry(txn
->t_private_list
.next
,
379 struct ext4_journal_cb_entry
, jce_list
);
380 list_del_init(&jce
->jce_list
);
381 spin_unlock(&sbi
->s_md_lock
);
382 jce
->jce_func(sb
, jce
, error
);
383 spin_lock(&sbi
->s_md_lock
);
385 spin_unlock(&sbi
->s_md_lock
);
388 /* Deal with the reporting of failure conditions on a filesystem such as
389 * inconsistencies detected or read IO failures.
391 * On ext2, we can store the error state of the filesystem in the
392 * superblock. That is not possible on ext4, because we may have other
393 * write ordering constraints on the superblock which prevent us from
394 * writing it out straight away; and given that the journal is about to
395 * be aborted, we can't rely on the current, or future, transactions to
396 * write out the superblock safely.
398 * We'll just use the jbd2_journal_abort() error code to record an error in
399 * the journal instead. On recovery, the journal will complain about
400 * that error until we've noted it down and cleared it.
403 static void ext4_handle_error(struct super_block
*sb
)
405 if (sb
->s_flags
& MS_RDONLY
)
408 if (!test_opt(sb
, ERRORS_CONT
)) {
409 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
411 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
413 jbd2_journal_abort(journal
, -EIO
);
415 if (test_opt(sb
, ERRORS_RO
)) {
416 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
418 * Make sure updated value of ->s_mount_flags will be visible
419 * before ->s_flags update
422 sb
->s_flags
|= MS_RDONLY
;
424 if (test_opt(sb
, ERRORS_PANIC
)) {
425 if (EXT4_SB(sb
)->s_journal
&&
426 !(EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_REC_ERR
))
428 panic("EXT4-fs (device %s): panic forced after error\n",
433 #define ext4_error_ratelimit(sb) \
434 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
437 void __ext4_error(struct super_block
*sb
, const char *function
,
438 unsigned int line
, const char *fmt
, ...)
440 struct va_format vaf
;
443 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
446 if (ext4_error_ratelimit(sb
)) {
451 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
452 sb
->s_id
, function
, line
, current
->comm
, &vaf
);
455 save_error_info(sb
, function
, line
);
456 ext4_handle_error(sb
);
459 void __ext4_error_inode(struct inode
*inode
, const char *function
,
460 unsigned int line
, ext4_fsblk_t block
,
461 const char *fmt
, ...)
464 struct va_format vaf
;
465 struct ext4_super_block
*es
= EXT4_SB(inode
->i_sb
)->s_es
;
467 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode
->i_sb
))))
470 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
471 es
->s_last_error_block
= cpu_to_le64(block
);
472 if (ext4_error_ratelimit(inode
->i_sb
)) {
477 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
478 "inode #%lu: block %llu: comm %s: %pV\n",
479 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
480 block
, current
->comm
, &vaf
);
482 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
483 "inode #%lu: comm %s: %pV\n",
484 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
485 current
->comm
, &vaf
);
488 save_error_info(inode
->i_sb
, function
, line
);
489 ext4_handle_error(inode
->i_sb
);
492 void __ext4_error_file(struct file
*file
, const char *function
,
493 unsigned int line
, ext4_fsblk_t block
,
494 const char *fmt
, ...)
497 struct va_format vaf
;
498 struct ext4_super_block
*es
;
499 struct inode
*inode
= file_inode(file
);
500 char pathname
[80], *path
;
502 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode
->i_sb
))))
505 es
= EXT4_SB(inode
->i_sb
)->s_es
;
506 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
507 if (ext4_error_ratelimit(inode
->i_sb
)) {
508 path
= file_path(file
, pathname
, sizeof(pathname
));
516 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
517 "block %llu: comm %s: path %s: %pV\n",
518 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
519 block
, current
->comm
, path
, &vaf
);
522 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
523 "comm %s: path %s: %pV\n",
524 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
525 current
->comm
, path
, &vaf
);
528 save_error_info(inode
->i_sb
, function
, line
);
529 ext4_handle_error(inode
->i_sb
);
532 const char *ext4_decode_error(struct super_block
*sb
, int errno
,
539 errstr
= "Corrupt filesystem";
542 errstr
= "Filesystem failed CRC";
545 errstr
= "IO failure";
548 errstr
= "Out of memory";
551 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
552 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
553 errstr
= "Journal has aborted";
555 errstr
= "Readonly filesystem";
558 /* If the caller passed in an extra buffer for unknown
559 * errors, textualise them now. Else we just return
562 /* Check for truncated error codes... */
563 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
572 /* __ext4_std_error decodes expected errors from journaling functions
573 * automatically and invokes the appropriate error response. */
575 void __ext4_std_error(struct super_block
*sb
, const char *function
,
576 unsigned int line
, int errno
)
581 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
584 /* Special case: if the error is EROFS, and we're not already
585 * inside a transaction, then there's really no point in logging
587 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
588 (sb
->s_flags
& MS_RDONLY
))
591 if (ext4_error_ratelimit(sb
)) {
592 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
593 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s:%d: %s\n",
594 sb
->s_id
, function
, line
, errstr
);
597 save_error_info(sb
, function
, line
);
598 ext4_handle_error(sb
);
602 * ext4_abort is a much stronger failure handler than ext4_error. The
603 * abort function may be used to deal with unrecoverable failures such
604 * as journal IO errors or ENOMEM at a critical moment in log management.
606 * We unconditionally force the filesystem into an ABORT|READONLY state,
607 * unless the error response on the fs has been set to panic in which
608 * case we take the easy way out and panic immediately.
611 void __ext4_abort(struct super_block
*sb
, const char *function
,
612 unsigned int line
, const char *fmt
, ...)
614 struct va_format vaf
;
617 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
620 save_error_info(sb
, function
, line
);
624 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: %pV\n",
625 sb
->s_id
, function
, line
, &vaf
);
628 if ((sb
->s_flags
& MS_RDONLY
) == 0) {
629 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
630 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
632 * Make sure updated value of ->s_mount_flags will be visible
633 * before ->s_flags update
636 sb
->s_flags
|= MS_RDONLY
;
637 if (EXT4_SB(sb
)->s_journal
)
638 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
639 save_error_info(sb
, function
, line
);
641 if (test_opt(sb
, ERRORS_PANIC
)) {
642 if (EXT4_SB(sb
)->s_journal
&&
643 !(EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_REC_ERR
))
645 panic("EXT4-fs panic from previous error\n");
649 void __ext4_msg(struct super_block
*sb
,
650 const char *prefix
, const char *fmt
, ...)
652 struct va_format vaf
;
655 if (!___ratelimit(&(EXT4_SB(sb
)->s_msg_ratelimit_state
), "EXT4-fs"))
661 printk("%sEXT4-fs (%s): %pV\n", prefix
, sb
->s_id
, &vaf
);
665 #define ext4_warning_ratelimit(sb) \
666 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
669 void __ext4_warning(struct super_block
*sb
, const char *function
,
670 unsigned int line
, const char *fmt
, ...)
672 struct va_format vaf
;
675 if (!ext4_warning_ratelimit(sb
))
681 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: %pV\n",
682 sb
->s_id
, function
, line
, &vaf
);
686 void __ext4_warning_inode(const struct inode
*inode
, const char *function
,
687 unsigned int line
, const char *fmt
, ...)
689 struct va_format vaf
;
692 if (!ext4_warning_ratelimit(inode
->i_sb
))
698 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: "
699 "inode #%lu: comm %s: %pV\n", inode
->i_sb
->s_id
,
700 function
, line
, inode
->i_ino
, current
->comm
, &vaf
);
704 void __ext4_grp_locked_error(const char *function
, unsigned int line
,
705 struct super_block
*sb
, ext4_group_t grp
,
706 unsigned long ino
, ext4_fsblk_t block
,
707 const char *fmt
, ...)
711 struct va_format vaf
;
713 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
715 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
718 es
->s_last_error_ino
= cpu_to_le32(ino
);
719 es
->s_last_error_block
= cpu_to_le64(block
);
720 __save_error_info(sb
, function
, line
);
722 if (ext4_error_ratelimit(sb
)) {
726 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: group %u, ",
727 sb
->s_id
, function
, line
, grp
);
729 printk(KERN_CONT
"inode %lu: ", ino
);
731 printk(KERN_CONT
"block %llu:",
732 (unsigned long long) block
);
733 printk(KERN_CONT
"%pV\n", &vaf
);
737 if (test_opt(sb
, ERRORS_CONT
)) {
738 ext4_commit_super(sb
, 0);
742 ext4_unlock_group(sb
, grp
);
743 ext4_handle_error(sb
);
745 * We only get here in the ERRORS_RO case; relocking the group
746 * may be dangerous, but nothing bad will happen since the
747 * filesystem will have already been marked read/only and the
748 * journal has been aborted. We return 1 as a hint to callers
749 * who might what to use the return value from
750 * ext4_grp_locked_error() to distinguish between the
751 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
752 * aggressively from the ext4 function in question, with a
753 * more appropriate error code.
755 ext4_lock_group(sb
, grp
);
759 void ext4_update_dynamic_rev(struct super_block
*sb
)
761 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
763 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
767 "updating to rev %d because of new feature flag, "
768 "running e2fsck is recommended",
771 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
772 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
773 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
774 /* leave es->s_feature_*compat flags alone */
775 /* es->s_uuid will be set by e2fsck if empty */
778 * The rest of the superblock fields should be zero, and if not it
779 * means they are likely already in use, so leave them alone. We
780 * can leave it up to e2fsck to clean up any inconsistencies there.
785 * Open the external journal device
787 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
789 struct block_device
*bdev
;
790 char b
[BDEVNAME_SIZE
];
792 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
, sb
);
798 ext4_msg(sb
, KERN_ERR
, "failed to open journal device %s: %ld",
799 __bdevname(dev
, b
), PTR_ERR(bdev
));
804 * Release the journal device
806 static void ext4_blkdev_put(struct block_device
*bdev
)
808 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
811 static void ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
813 struct block_device
*bdev
;
814 bdev
= sbi
->journal_bdev
;
816 ext4_blkdev_put(bdev
);
817 sbi
->journal_bdev
= NULL
;
821 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
823 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
826 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
830 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
831 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
833 printk(KERN_ERR
"sb_info orphan list:\n");
834 list_for_each(l
, &sbi
->s_orphan
) {
835 struct inode
*inode
= orphan_list_entry(l
);
837 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
838 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
839 inode
->i_mode
, inode
->i_nlink
,
845 static int ext4_quota_off(struct super_block
*sb
, int type
);
847 static inline void ext4_quota_off_umount(struct super_block
*sb
)
851 if (ext4_has_feature_quota(sb
)) {
852 dquot_disable(sb
, -1,
853 DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
855 /* Use our quota_off function to clear inode flags etc. */
856 for (type
= 0; type
< EXT4_MAXQUOTAS
; type
++)
857 ext4_quota_off(sb
, type
);
861 static inline void ext4_quota_off_umount(struct super_block
*sb
)
866 static void ext4_put_super(struct super_block
*sb
)
868 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
869 struct ext4_super_block
*es
= sbi
->s_es
;
873 ext4_unregister_li_request(sb
);
874 ext4_quota_off_umount(sb
);
876 flush_workqueue(sbi
->rsv_conversion_wq
);
877 destroy_workqueue(sbi
->rsv_conversion_wq
);
879 if (sbi
->s_journal
) {
880 aborted
= is_journal_aborted(sbi
->s_journal
);
881 err
= jbd2_journal_destroy(sbi
->s_journal
);
882 sbi
->s_journal
= NULL
;
883 if ((err
< 0) && !aborted
)
884 ext4_abort(sb
, "Couldn't clean up the journal");
887 ext4_unregister_sysfs(sb
);
888 ext4_es_unregister_shrinker(sbi
);
889 del_timer_sync(&sbi
->s_err_report
);
890 ext4_release_system_zone(sb
);
892 ext4_ext_release(sb
);
894 if (!(sb
->s_flags
& MS_RDONLY
) && !aborted
) {
895 ext4_clear_feature_journal_needs_recovery(sb
);
896 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
898 if (!(sb
->s_flags
& MS_RDONLY
))
899 ext4_commit_super(sb
, 1);
901 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
902 brelse(sbi
->s_group_desc
[i
]);
903 kvfree(sbi
->s_group_desc
);
904 kvfree(sbi
->s_flex_groups
);
905 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
906 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
907 percpu_counter_destroy(&sbi
->s_dirs_counter
);
908 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
909 percpu_free_rwsem(&sbi
->s_journal_flag_rwsem
);
911 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
912 kfree(sbi
->s_qf_names
[i
]);
915 /* Debugging code just in case the in-memory inode orphan list
916 * isn't empty. The on-disk one can be non-empty if we've
917 * detected an error and taken the fs readonly, but the
918 * in-memory list had better be clean by this point. */
919 if (!list_empty(&sbi
->s_orphan
))
920 dump_orphan_list(sb
, sbi
);
921 J_ASSERT(list_empty(&sbi
->s_orphan
));
923 sync_blockdev(sb
->s_bdev
);
924 invalidate_bdev(sb
->s_bdev
);
925 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
927 * Invalidate the journal device's buffers. We don't want them
928 * floating about in memory - the physical journal device may
929 * hotswapped, and it breaks the `ro-after' testing code.
931 sync_blockdev(sbi
->journal_bdev
);
932 invalidate_bdev(sbi
->journal_bdev
);
933 ext4_blkdev_remove(sbi
);
935 if (sbi
->s_mb_cache
) {
936 ext4_xattr_destroy_cache(sbi
->s_mb_cache
);
937 sbi
->s_mb_cache
= NULL
;
940 kthread_stop(sbi
->s_mmp_tsk
);
942 sb
->s_fs_info
= NULL
;
944 * Now that we are completely done shutting down the
945 * superblock, we need to actually destroy the kobject.
947 kobject_put(&sbi
->s_kobj
);
948 wait_for_completion(&sbi
->s_kobj_unregister
);
949 if (sbi
->s_chksum_driver
)
950 crypto_free_shash(sbi
->s_chksum_driver
);
951 kfree(sbi
->s_blockgroup_lock
);
955 static struct kmem_cache
*ext4_inode_cachep
;
958 * Called inside transaction, so use GFP_NOFS
960 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
962 struct ext4_inode_info
*ei
;
964 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
968 ei
->vfs_inode
.i_version
= 1;
969 spin_lock_init(&ei
->i_raw_lock
);
970 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
971 spin_lock_init(&ei
->i_prealloc_lock
);
972 ext4_es_init_tree(&ei
->i_es_tree
);
973 rwlock_init(&ei
->i_es_lock
);
974 INIT_LIST_HEAD(&ei
->i_es_list
);
977 ei
->i_es_shrink_lblk
= 0;
978 ei
->i_reserved_data_blocks
= 0;
979 ei
->i_reserved_meta_blocks
= 0;
980 ei
->i_allocated_meta_blocks
= 0;
981 ei
->i_da_metadata_calc_len
= 0;
982 ei
->i_da_metadata_calc_last_lblock
= 0;
983 spin_lock_init(&(ei
->i_block_reservation_lock
));
985 ei
->i_reserved_quota
= 0;
986 memset(&ei
->i_dquot
, 0, sizeof(ei
->i_dquot
));
989 INIT_LIST_HEAD(&ei
->i_rsv_conversion_list
);
990 spin_lock_init(&ei
->i_completed_io_lock
);
992 ei
->i_datasync_tid
= 0;
993 atomic_set(&ei
->i_unwritten
, 0);
994 INIT_WORK(&ei
->i_rsv_conversion_work
, ext4_end_io_rsv_work
);
995 return &ei
->vfs_inode
;
998 static int ext4_drop_inode(struct inode
*inode
)
1000 int drop
= generic_drop_inode(inode
);
1002 trace_ext4_drop_inode(inode
, drop
);
1006 static void ext4_i_callback(struct rcu_head
*head
)
1008 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
1009 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
1012 static void ext4_destroy_inode(struct inode
*inode
)
1014 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
1015 ext4_msg(inode
->i_sb
, KERN_ERR
,
1016 "Inode %lu (%p): orphan list check failed!",
1017 inode
->i_ino
, EXT4_I(inode
));
1018 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
1019 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
1023 call_rcu(&inode
->i_rcu
, ext4_i_callback
);
1026 static void init_once(void *foo
)
1028 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
1030 INIT_LIST_HEAD(&ei
->i_orphan
);
1031 init_rwsem(&ei
->xattr_sem
);
1032 init_rwsem(&ei
->i_data_sem
);
1033 init_rwsem(&ei
->i_mmap_sem
);
1034 inode_init_once(&ei
->vfs_inode
);
1037 static int __init
init_inodecache(void)
1039 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
1040 sizeof(struct ext4_inode_info
),
1041 0, (SLAB_RECLAIM_ACCOUNT
|
1042 SLAB_MEM_SPREAD
|SLAB_ACCOUNT
),
1044 if (ext4_inode_cachep
== NULL
)
1049 static void destroy_inodecache(void)
1052 * Make sure all delayed rcu free inodes are flushed before we
1056 kmem_cache_destroy(ext4_inode_cachep
);
1059 void ext4_clear_inode(struct inode
*inode
)
1061 invalidate_inode_buffers(inode
);
1064 ext4_discard_preallocations(inode
);
1065 ext4_es_remove_extent(inode
, 0, EXT_MAX_BLOCKS
);
1066 if (EXT4_I(inode
)->jinode
) {
1067 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode
),
1068 EXT4_I(inode
)->jinode
);
1069 jbd2_free_inode(EXT4_I(inode
)->jinode
);
1070 EXT4_I(inode
)->jinode
= NULL
;
1072 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1073 fscrypt_put_encryption_info(inode
, NULL
);
1077 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
1078 u64 ino
, u32 generation
)
1080 struct inode
*inode
;
1082 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
1083 return ERR_PTR(-ESTALE
);
1084 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
1085 return ERR_PTR(-ESTALE
);
1087 /* iget isn't really right if the inode is currently unallocated!!
1089 * ext4_read_inode will return a bad_inode if the inode had been
1090 * deleted, so we should be safe.
1092 * Currently we don't know the generation for parent directory, so
1093 * a generation of 0 means "accept any"
1095 inode
= ext4_iget_normal(sb
, ino
);
1097 return ERR_CAST(inode
);
1098 if (generation
&& inode
->i_generation
!= generation
) {
1100 return ERR_PTR(-ESTALE
);
1106 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
1107 int fh_len
, int fh_type
)
1109 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
1110 ext4_nfs_get_inode
);
1113 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
1114 int fh_len
, int fh_type
)
1116 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
1117 ext4_nfs_get_inode
);
1121 * Try to release metadata pages (indirect blocks, directories) which are
1122 * mapped via the block device. Since these pages could have journal heads
1123 * which would prevent try_to_free_buffers() from freeing them, we must use
1124 * jbd2 layer's try_to_free_buffers() function to release them.
1126 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
1129 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
1131 WARN_ON(PageChecked(page
));
1132 if (!page_has_buffers(page
))
1135 return jbd2_journal_try_to_free_buffers(journal
, page
,
1136 wait
& ~__GFP_DIRECT_RECLAIM
);
1137 return try_to_free_buffers(page
);
1140 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1141 static int ext4_get_context(struct inode
*inode
, void *ctx
, size_t len
)
1143 return ext4_xattr_get(inode
, EXT4_XATTR_INDEX_ENCRYPTION
,
1144 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT
, ctx
, len
);
1147 static int ext4_set_context(struct inode
*inode
, const void *ctx
, size_t len
,
1150 handle_t
*handle
= fs_data
;
1151 int res
, res2
, retries
= 0;
1153 res
= ext4_convert_inline_data(inode
);
1158 * If a journal handle was specified, then the encryption context is
1159 * being set on a new inode via inheritance and is part of a larger
1160 * transaction to create the inode. Otherwise the encryption context is
1161 * being set on an existing inode in its own transaction. Only in the
1162 * latter case should the "retry on ENOSPC" logic be used.
1166 res
= ext4_xattr_set_handle(handle
, inode
,
1167 EXT4_XATTR_INDEX_ENCRYPTION
,
1168 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT
,
1171 ext4_set_inode_flag(inode
, EXT4_INODE_ENCRYPT
);
1172 ext4_clear_inode_state(inode
,
1173 EXT4_STATE_MAY_INLINE_DATA
);
1175 * Update inode->i_flags - e.g. S_DAX may get disabled
1177 ext4_set_inode_flags(inode
);
1183 handle
= ext4_journal_start(inode
, EXT4_HT_MISC
,
1184 ext4_jbd2_credits_xattr(inode
));
1186 return PTR_ERR(handle
);
1188 res
= ext4_xattr_set_handle(handle
, inode
, EXT4_XATTR_INDEX_ENCRYPTION
,
1189 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT
,
1192 ext4_set_inode_flag(inode
, EXT4_INODE_ENCRYPT
);
1193 /* Update inode->i_flags - e.g. S_DAX may get disabled */
1194 ext4_set_inode_flags(inode
);
1195 res
= ext4_mark_inode_dirty(handle
, inode
);
1197 EXT4_ERROR_INODE(inode
, "Failed to mark inode dirty");
1199 res2
= ext4_journal_stop(handle
);
1201 if (res
== -ENOSPC
&& ext4_should_retry_alloc(inode
->i_sb
, &retries
))
1208 static int ext4_dummy_context(struct inode
*inode
)
1210 return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode
->i_sb
));
1213 static unsigned ext4_max_namelen(struct inode
*inode
)
1215 return S_ISLNK(inode
->i_mode
) ? inode
->i_sb
->s_blocksize
:
1219 static const struct fscrypt_operations ext4_cryptops
= {
1220 .key_prefix
= "ext4:",
1221 .get_context
= ext4_get_context
,
1222 .set_context
= ext4_set_context
,
1223 .dummy_context
= ext4_dummy_context
,
1224 .is_encrypted
= ext4_encrypted_inode
,
1225 .empty_dir
= ext4_empty_dir
,
1226 .max_namelen
= ext4_max_namelen
,
1229 static const struct fscrypt_operations ext4_cryptops
= {
1230 .is_encrypted
= ext4_encrypted_inode
,
1235 static const char * const quotatypes
[] = INITQFNAMES
;
1236 #define QTYPE2NAME(t) (quotatypes[t])
1238 static int ext4_write_dquot(struct dquot
*dquot
);
1239 static int ext4_acquire_dquot(struct dquot
*dquot
);
1240 static int ext4_release_dquot(struct dquot
*dquot
);
1241 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1242 static int ext4_write_info(struct super_block
*sb
, int type
);
1243 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1244 const struct path
*path
);
1245 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1246 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1247 size_t len
, loff_t off
);
1248 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1249 const char *data
, size_t len
, loff_t off
);
1250 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
1251 unsigned int flags
);
1252 static int ext4_enable_quotas(struct super_block
*sb
);
1253 static int ext4_get_next_id(struct super_block
*sb
, struct kqid
*qid
);
1255 static struct dquot
**ext4_get_dquots(struct inode
*inode
)
1257 return EXT4_I(inode
)->i_dquot
;
1260 static const struct dquot_operations ext4_quota_operations
= {
1261 .get_reserved_space
= ext4_get_reserved_space
,
1262 .write_dquot
= ext4_write_dquot
,
1263 .acquire_dquot
= ext4_acquire_dquot
,
1264 .release_dquot
= ext4_release_dquot
,
1265 .mark_dirty
= ext4_mark_dquot_dirty
,
1266 .write_info
= ext4_write_info
,
1267 .alloc_dquot
= dquot_alloc
,
1268 .destroy_dquot
= dquot_destroy
,
1269 .get_projid
= ext4_get_projid
,
1270 .get_next_id
= ext4_get_next_id
,
1273 static const struct quotactl_ops ext4_qctl_operations
= {
1274 .quota_on
= ext4_quota_on
,
1275 .quota_off
= ext4_quota_off
,
1276 .quota_sync
= dquot_quota_sync
,
1277 .get_state
= dquot_get_state
,
1278 .set_info
= dquot_set_dqinfo
,
1279 .get_dqblk
= dquot_get_dqblk
,
1280 .set_dqblk
= dquot_set_dqblk
,
1281 .get_nextdqblk
= dquot_get_next_dqblk
,
1285 static const struct super_operations ext4_sops
= {
1286 .alloc_inode
= ext4_alloc_inode
,
1287 .destroy_inode
= ext4_destroy_inode
,
1288 .write_inode
= ext4_write_inode
,
1289 .dirty_inode
= ext4_dirty_inode
,
1290 .drop_inode
= ext4_drop_inode
,
1291 .evict_inode
= ext4_evict_inode
,
1292 .put_super
= ext4_put_super
,
1293 .sync_fs
= ext4_sync_fs
,
1294 .freeze_fs
= ext4_freeze
,
1295 .unfreeze_fs
= ext4_unfreeze
,
1296 .statfs
= ext4_statfs
,
1297 .remount_fs
= ext4_remount
,
1298 .show_options
= ext4_show_options
,
1300 .quota_read
= ext4_quota_read
,
1301 .quota_write
= ext4_quota_write
,
1302 .get_dquots
= ext4_get_dquots
,
1304 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1307 static const struct export_operations ext4_export_ops
= {
1308 .fh_to_dentry
= ext4_fh_to_dentry
,
1309 .fh_to_parent
= ext4_fh_to_parent
,
1310 .get_parent
= ext4_get_parent
,
1314 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1315 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1316 Opt_nouid32
, Opt_debug
, Opt_removed
,
1317 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1318 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
,
1319 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
, Opt_journal_dev
,
1320 Opt_journal_path
, Opt_journal_checksum
, Opt_journal_async_commit
,
1321 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1322 Opt_data_err_abort
, Opt_data_err_ignore
, Opt_test_dummy_encryption
,
1323 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1324 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1325 Opt_noquota
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1326 Opt_usrquota
, Opt_grpquota
, Opt_prjquota
, Opt_i_version
, Opt_dax
,
1327 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
, Opt_mblk_io_submit
,
1328 Opt_lazytime
, Opt_nolazytime
, Opt_debug_want_extra_isize
,
1329 Opt_nomblk_io_submit
, Opt_block_validity
, Opt_noblock_validity
,
1330 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1331 Opt_dioread_nolock
, Opt_dioread_lock
,
1332 Opt_discard
, Opt_nodiscard
, Opt_init_itable
, Opt_noinit_itable
,
1333 Opt_max_dir_size_kb
, Opt_nojournal_checksum
,
1336 static const match_table_t tokens
= {
1337 {Opt_bsd_df
, "bsddf"},
1338 {Opt_minix_df
, "minixdf"},
1339 {Opt_grpid
, "grpid"},
1340 {Opt_grpid
, "bsdgroups"},
1341 {Opt_nogrpid
, "nogrpid"},
1342 {Opt_nogrpid
, "sysvgroups"},
1343 {Opt_resgid
, "resgid=%u"},
1344 {Opt_resuid
, "resuid=%u"},
1346 {Opt_err_cont
, "errors=continue"},
1347 {Opt_err_panic
, "errors=panic"},
1348 {Opt_err_ro
, "errors=remount-ro"},
1349 {Opt_nouid32
, "nouid32"},
1350 {Opt_debug
, "debug"},
1351 {Opt_removed
, "oldalloc"},
1352 {Opt_removed
, "orlov"},
1353 {Opt_user_xattr
, "user_xattr"},
1354 {Opt_nouser_xattr
, "nouser_xattr"},
1356 {Opt_noacl
, "noacl"},
1357 {Opt_noload
, "norecovery"},
1358 {Opt_noload
, "noload"},
1359 {Opt_removed
, "nobh"},
1360 {Opt_removed
, "bh"},
1361 {Opt_commit
, "commit=%u"},
1362 {Opt_min_batch_time
, "min_batch_time=%u"},
1363 {Opt_max_batch_time
, "max_batch_time=%u"},
1364 {Opt_journal_dev
, "journal_dev=%u"},
1365 {Opt_journal_path
, "journal_path=%s"},
1366 {Opt_journal_checksum
, "journal_checksum"},
1367 {Opt_nojournal_checksum
, "nojournal_checksum"},
1368 {Opt_journal_async_commit
, "journal_async_commit"},
1369 {Opt_abort
, "abort"},
1370 {Opt_data_journal
, "data=journal"},
1371 {Opt_data_ordered
, "data=ordered"},
1372 {Opt_data_writeback
, "data=writeback"},
1373 {Opt_data_err_abort
, "data_err=abort"},
1374 {Opt_data_err_ignore
, "data_err=ignore"},
1375 {Opt_offusrjquota
, "usrjquota="},
1376 {Opt_usrjquota
, "usrjquota=%s"},
1377 {Opt_offgrpjquota
, "grpjquota="},
1378 {Opt_grpjquota
, "grpjquota=%s"},
1379 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1380 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1381 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1382 {Opt_grpquota
, "grpquota"},
1383 {Opt_noquota
, "noquota"},
1384 {Opt_quota
, "quota"},
1385 {Opt_usrquota
, "usrquota"},
1386 {Opt_prjquota
, "prjquota"},
1387 {Opt_barrier
, "barrier=%u"},
1388 {Opt_barrier
, "barrier"},
1389 {Opt_nobarrier
, "nobarrier"},
1390 {Opt_i_version
, "i_version"},
1392 {Opt_stripe
, "stripe=%u"},
1393 {Opt_delalloc
, "delalloc"},
1394 {Opt_lazytime
, "lazytime"},
1395 {Opt_nolazytime
, "nolazytime"},
1396 {Opt_debug_want_extra_isize
, "debug_want_extra_isize=%u"},
1397 {Opt_nodelalloc
, "nodelalloc"},
1398 {Opt_removed
, "mblk_io_submit"},
1399 {Opt_removed
, "nomblk_io_submit"},
1400 {Opt_block_validity
, "block_validity"},
1401 {Opt_noblock_validity
, "noblock_validity"},
1402 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1403 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1404 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1405 {Opt_auto_da_alloc
, "auto_da_alloc"},
1406 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1407 {Opt_dioread_nolock
, "dioread_nolock"},
1408 {Opt_dioread_lock
, "dioread_lock"},
1409 {Opt_discard
, "discard"},
1410 {Opt_nodiscard
, "nodiscard"},
1411 {Opt_init_itable
, "init_itable=%u"},
1412 {Opt_init_itable
, "init_itable"},
1413 {Opt_noinit_itable
, "noinit_itable"},
1414 {Opt_max_dir_size_kb
, "max_dir_size_kb=%u"},
1415 {Opt_test_dummy_encryption
, "test_dummy_encryption"},
1416 {Opt_removed
, "check=none"}, /* mount option from ext2/3 */
1417 {Opt_removed
, "nocheck"}, /* mount option from ext2/3 */
1418 {Opt_removed
, "reservation"}, /* mount option from ext2/3 */
1419 {Opt_removed
, "noreservation"}, /* mount option from ext2/3 */
1420 {Opt_removed
, "journal=%u"}, /* mount option from ext2/3 */
1424 static ext4_fsblk_t
get_sb_block(void **data
)
1426 ext4_fsblk_t sb_block
;
1427 char *options
= (char *) *data
;
1429 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1430 return 1; /* Default location */
1433 /* TODO: use simple_strtoll with >32bit ext4 */
1434 sb_block
= simple_strtoul(options
, &options
, 0);
1435 if (*options
&& *options
!= ',') {
1436 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1440 if (*options
== ',')
1442 *data
= (void *) options
;
1447 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1448 static const char deprecated_msg
[] =
1449 "Mount option \"%s\" will be removed by %s\n"
1450 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1453 static int set_qf_name(struct super_block
*sb
, int qtype
, substring_t
*args
)
1455 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1459 if (sb_any_quota_loaded(sb
) &&
1460 !sbi
->s_qf_names
[qtype
]) {
1461 ext4_msg(sb
, KERN_ERR
,
1462 "Cannot change journaled "
1463 "quota options when quota turned on");
1466 if (ext4_has_feature_quota(sb
)) {
1467 ext4_msg(sb
, KERN_INFO
, "Journaled quota options "
1468 "ignored when QUOTA feature is enabled");
1471 qname
= match_strdup(args
);
1473 ext4_msg(sb
, KERN_ERR
,
1474 "Not enough memory for storing quotafile name");
1477 if (sbi
->s_qf_names
[qtype
]) {
1478 if (strcmp(sbi
->s_qf_names
[qtype
], qname
) == 0)
1481 ext4_msg(sb
, KERN_ERR
,
1482 "%s quota file already specified",
1486 if (strchr(qname
, '/')) {
1487 ext4_msg(sb
, KERN_ERR
,
1488 "quotafile must be on filesystem root");
1491 sbi
->s_qf_names
[qtype
] = qname
;
1499 static int clear_qf_name(struct super_block
*sb
, int qtype
)
1502 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1504 if (sb_any_quota_loaded(sb
) &&
1505 sbi
->s_qf_names
[qtype
]) {
1506 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled quota options"
1507 " when quota turned on");
1510 kfree(sbi
->s_qf_names
[qtype
]);
1511 sbi
->s_qf_names
[qtype
] = NULL
;
1516 #define MOPT_SET 0x0001
1517 #define MOPT_CLEAR 0x0002
1518 #define MOPT_NOSUPPORT 0x0004
1519 #define MOPT_EXPLICIT 0x0008
1520 #define MOPT_CLEAR_ERR 0x0010
1521 #define MOPT_GTE0 0x0020
1524 #define MOPT_QFMT 0x0040
1526 #define MOPT_Q MOPT_NOSUPPORT
1527 #define MOPT_QFMT MOPT_NOSUPPORT
1529 #define MOPT_DATAJ 0x0080
1530 #define MOPT_NO_EXT2 0x0100
1531 #define MOPT_NO_EXT3 0x0200
1532 #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1533 #define MOPT_STRING 0x0400
1535 static const struct mount_opts
{
1539 } ext4_mount_opts
[] = {
1540 {Opt_minix_df
, EXT4_MOUNT_MINIX_DF
, MOPT_SET
},
1541 {Opt_bsd_df
, EXT4_MOUNT_MINIX_DF
, MOPT_CLEAR
},
1542 {Opt_grpid
, EXT4_MOUNT_GRPID
, MOPT_SET
},
1543 {Opt_nogrpid
, EXT4_MOUNT_GRPID
, MOPT_CLEAR
},
1544 {Opt_block_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_SET
},
1545 {Opt_noblock_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_CLEAR
},
1546 {Opt_dioread_nolock
, EXT4_MOUNT_DIOREAD_NOLOCK
,
1547 MOPT_EXT4_ONLY
| MOPT_SET
},
1548 {Opt_dioread_lock
, EXT4_MOUNT_DIOREAD_NOLOCK
,
1549 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1550 {Opt_discard
, EXT4_MOUNT_DISCARD
, MOPT_SET
},
1551 {Opt_nodiscard
, EXT4_MOUNT_DISCARD
, MOPT_CLEAR
},
1552 {Opt_delalloc
, EXT4_MOUNT_DELALLOC
,
1553 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1554 {Opt_nodelalloc
, EXT4_MOUNT_DELALLOC
,
1555 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1556 {Opt_nojournal_checksum
, EXT4_MOUNT_JOURNAL_CHECKSUM
,
1557 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1558 {Opt_journal_checksum
, EXT4_MOUNT_JOURNAL_CHECKSUM
,
1559 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1560 {Opt_journal_async_commit
, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT
|
1561 EXT4_MOUNT_JOURNAL_CHECKSUM
),
1562 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1563 {Opt_noload
, EXT4_MOUNT_NOLOAD
, MOPT_NO_EXT2
| MOPT_SET
},
1564 {Opt_err_panic
, EXT4_MOUNT_ERRORS_PANIC
, MOPT_SET
| MOPT_CLEAR_ERR
},
1565 {Opt_err_ro
, EXT4_MOUNT_ERRORS_RO
, MOPT_SET
| MOPT_CLEAR_ERR
},
1566 {Opt_err_cont
, EXT4_MOUNT_ERRORS_CONT
, MOPT_SET
| MOPT_CLEAR_ERR
},
1567 {Opt_data_err_abort
, EXT4_MOUNT_DATA_ERR_ABORT
,
1569 {Opt_data_err_ignore
, EXT4_MOUNT_DATA_ERR_ABORT
,
1571 {Opt_barrier
, EXT4_MOUNT_BARRIER
, MOPT_SET
},
1572 {Opt_nobarrier
, EXT4_MOUNT_BARRIER
, MOPT_CLEAR
},
1573 {Opt_noauto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_SET
},
1574 {Opt_auto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_CLEAR
},
1575 {Opt_noinit_itable
, EXT4_MOUNT_INIT_INODE_TABLE
, MOPT_CLEAR
},
1576 {Opt_commit
, 0, MOPT_GTE0
},
1577 {Opt_max_batch_time
, 0, MOPT_GTE0
},
1578 {Opt_min_batch_time
, 0, MOPT_GTE0
},
1579 {Opt_inode_readahead_blks
, 0, MOPT_GTE0
},
1580 {Opt_init_itable
, 0, MOPT_GTE0
},
1581 {Opt_dax
, EXT4_MOUNT_DAX
, MOPT_SET
},
1582 {Opt_stripe
, 0, MOPT_GTE0
},
1583 {Opt_resuid
, 0, MOPT_GTE0
},
1584 {Opt_resgid
, 0, MOPT_GTE0
},
1585 {Opt_journal_dev
, 0, MOPT_NO_EXT2
| MOPT_GTE0
},
1586 {Opt_journal_path
, 0, MOPT_NO_EXT2
| MOPT_STRING
},
1587 {Opt_journal_ioprio
, 0, MOPT_NO_EXT2
| MOPT_GTE0
},
1588 {Opt_data_journal
, EXT4_MOUNT_JOURNAL_DATA
, MOPT_NO_EXT2
| MOPT_DATAJ
},
1589 {Opt_data_ordered
, EXT4_MOUNT_ORDERED_DATA
, MOPT_NO_EXT2
| MOPT_DATAJ
},
1590 {Opt_data_writeback
, EXT4_MOUNT_WRITEBACK_DATA
,
1591 MOPT_NO_EXT2
| MOPT_DATAJ
},
1592 {Opt_user_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_SET
},
1593 {Opt_nouser_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_CLEAR
},
1594 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1595 {Opt_acl
, EXT4_MOUNT_POSIX_ACL
, MOPT_SET
},
1596 {Opt_noacl
, EXT4_MOUNT_POSIX_ACL
, MOPT_CLEAR
},
1598 {Opt_acl
, 0, MOPT_NOSUPPORT
},
1599 {Opt_noacl
, 0, MOPT_NOSUPPORT
},
1601 {Opt_nouid32
, EXT4_MOUNT_NO_UID32
, MOPT_SET
},
1602 {Opt_debug
, EXT4_MOUNT_DEBUG
, MOPT_SET
},
1603 {Opt_debug_want_extra_isize
, 0, MOPT_GTE0
},
1604 {Opt_quota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
, MOPT_SET
| MOPT_Q
},
1605 {Opt_usrquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
,
1607 {Opt_grpquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_GRPQUOTA
,
1609 {Opt_prjquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_PRJQUOTA
,
1611 {Opt_noquota
, (EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
|
1612 EXT4_MOUNT_GRPQUOTA
| EXT4_MOUNT_PRJQUOTA
),
1613 MOPT_CLEAR
| MOPT_Q
},
1614 {Opt_usrjquota
, 0, MOPT_Q
},
1615 {Opt_grpjquota
, 0, MOPT_Q
},
1616 {Opt_offusrjquota
, 0, MOPT_Q
},
1617 {Opt_offgrpjquota
, 0, MOPT_Q
},
1618 {Opt_jqfmt_vfsold
, QFMT_VFS_OLD
, MOPT_QFMT
},
1619 {Opt_jqfmt_vfsv0
, QFMT_VFS_V0
, MOPT_QFMT
},
1620 {Opt_jqfmt_vfsv1
, QFMT_VFS_V1
, MOPT_QFMT
},
1621 {Opt_max_dir_size_kb
, 0, MOPT_GTE0
},
1622 {Opt_test_dummy_encryption
, 0, MOPT_GTE0
},
1626 static int handle_mount_opt(struct super_block
*sb
, char *opt
, int token
,
1627 substring_t
*args
, unsigned long *journal_devnum
,
1628 unsigned int *journal_ioprio
, int is_remount
)
1630 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1631 const struct mount_opts
*m
;
1637 if (token
== Opt_usrjquota
)
1638 return set_qf_name(sb
, USRQUOTA
, &args
[0]);
1639 else if (token
== Opt_grpjquota
)
1640 return set_qf_name(sb
, GRPQUOTA
, &args
[0]);
1641 else if (token
== Opt_offusrjquota
)
1642 return clear_qf_name(sb
, USRQUOTA
);
1643 else if (token
== Opt_offgrpjquota
)
1644 return clear_qf_name(sb
, GRPQUOTA
);
1648 case Opt_nouser_xattr
:
1649 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, opt
, "3.5");
1652 return 1; /* handled by get_sb_block() */
1654 ext4_msg(sb
, KERN_WARNING
, "Ignoring removed %s option", opt
);
1657 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1660 sb
->s_flags
|= MS_I_VERSION
;
1663 sb
->s_flags
|= MS_LAZYTIME
;
1665 case Opt_nolazytime
:
1666 sb
->s_flags
&= ~MS_LAZYTIME
;
1670 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++)
1671 if (token
== m
->token
)
1674 if (m
->token
== Opt_err
) {
1675 ext4_msg(sb
, KERN_ERR
, "Unrecognized mount option \"%s\" "
1676 "or missing value", opt
);
1680 if ((m
->flags
& MOPT_NO_EXT2
) && IS_EXT2_SB(sb
)) {
1681 ext4_msg(sb
, KERN_ERR
,
1682 "Mount option \"%s\" incompatible with ext2", opt
);
1685 if ((m
->flags
& MOPT_NO_EXT3
) && IS_EXT3_SB(sb
)) {
1686 ext4_msg(sb
, KERN_ERR
,
1687 "Mount option \"%s\" incompatible with ext3", opt
);
1691 if (args
->from
&& !(m
->flags
& MOPT_STRING
) && match_int(args
, &arg
))
1693 if (args
->from
&& (m
->flags
& MOPT_GTE0
) && (arg
< 0))
1695 if (m
->flags
& MOPT_EXPLICIT
) {
1696 if (m
->mount_opt
& EXT4_MOUNT_DELALLOC
) {
1697 set_opt2(sb
, EXPLICIT_DELALLOC
);
1698 } else if (m
->mount_opt
& EXT4_MOUNT_JOURNAL_CHECKSUM
) {
1699 set_opt2(sb
, EXPLICIT_JOURNAL_CHECKSUM
);
1703 if (m
->flags
& MOPT_CLEAR_ERR
)
1704 clear_opt(sb
, ERRORS_MASK
);
1705 if (token
== Opt_noquota
&& sb_any_quota_loaded(sb
)) {
1706 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1707 "options when quota turned on");
1711 if (m
->flags
& MOPT_NOSUPPORT
) {
1712 ext4_msg(sb
, KERN_ERR
, "%s option not supported", opt
);
1713 } else if (token
== Opt_commit
) {
1715 arg
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1716 sbi
->s_commit_interval
= HZ
* arg
;
1717 } else if (token
== Opt_debug_want_extra_isize
) {
1718 sbi
->s_want_extra_isize
= arg
;
1719 } else if (token
== Opt_max_batch_time
) {
1720 sbi
->s_max_batch_time
= arg
;
1721 } else if (token
== Opt_min_batch_time
) {
1722 sbi
->s_min_batch_time
= arg
;
1723 } else if (token
== Opt_inode_readahead_blks
) {
1724 if (arg
&& (arg
> (1 << 30) || !is_power_of_2(arg
))) {
1725 ext4_msg(sb
, KERN_ERR
,
1726 "EXT4-fs: inode_readahead_blks must be "
1727 "0 or a power of 2 smaller than 2^31");
1730 sbi
->s_inode_readahead_blks
= arg
;
1731 } else if (token
== Opt_init_itable
) {
1732 set_opt(sb
, INIT_INODE_TABLE
);
1734 arg
= EXT4_DEF_LI_WAIT_MULT
;
1735 sbi
->s_li_wait_mult
= arg
;
1736 } else if (token
== Opt_max_dir_size_kb
) {
1737 sbi
->s_max_dir_size_kb
= arg
;
1738 } else if (token
== Opt_stripe
) {
1739 sbi
->s_stripe
= arg
;
1740 } else if (token
== Opt_resuid
) {
1741 uid
= make_kuid(current_user_ns(), arg
);
1742 if (!uid_valid(uid
)) {
1743 ext4_msg(sb
, KERN_ERR
, "Invalid uid value %d", arg
);
1746 sbi
->s_resuid
= uid
;
1747 } else if (token
== Opt_resgid
) {
1748 gid
= make_kgid(current_user_ns(), arg
);
1749 if (!gid_valid(gid
)) {
1750 ext4_msg(sb
, KERN_ERR
, "Invalid gid value %d", arg
);
1753 sbi
->s_resgid
= gid
;
1754 } else if (token
== Opt_journal_dev
) {
1756 ext4_msg(sb
, KERN_ERR
,
1757 "Cannot specify journal on remount");
1760 *journal_devnum
= arg
;
1761 } else if (token
== Opt_journal_path
) {
1763 struct inode
*journal_inode
;
1768 ext4_msg(sb
, KERN_ERR
,
1769 "Cannot specify journal on remount");
1772 journal_path
= match_strdup(&args
[0]);
1773 if (!journal_path
) {
1774 ext4_msg(sb
, KERN_ERR
, "error: could not dup "
1775 "journal device string");
1779 error
= kern_path(journal_path
, LOOKUP_FOLLOW
, &path
);
1781 ext4_msg(sb
, KERN_ERR
, "error: could not find "
1782 "journal device path: error %d", error
);
1783 kfree(journal_path
);
1787 journal_inode
= d_inode(path
.dentry
);
1788 if (!S_ISBLK(journal_inode
->i_mode
)) {
1789 ext4_msg(sb
, KERN_ERR
, "error: journal path %s "
1790 "is not a block device", journal_path
);
1792 kfree(journal_path
);
1796 *journal_devnum
= new_encode_dev(journal_inode
->i_rdev
);
1798 kfree(journal_path
);
1799 } else if (token
== Opt_journal_ioprio
) {
1801 ext4_msg(sb
, KERN_ERR
, "Invalid journal IO priority"
1806 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
, arg
);
1807 } else if (token
== Opt_test_dummy_encryption
) {
1808 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1809 sbi
->s_mount_flags
|= EXT4_MF_TEST_DUMMY_ENCRYPTION
;
1810 ext4_msg(sb
, KERN_WARNING
,
1811 "Test dummy encryption mode enabled");
1813 ext4_msg(sb
, KERN_WARNING
,
1814 "Test dummy encryption mount option ignored");
1816 } else if (m
->flags
& MOPT_DATAJ
) {
1818 if (!sbi
->s_journal
)
1819 ext4_msg(sb
, KERN_WARNING
, "Remounting file system with no journal so ignoring journalled data option");
1820 else if (test_opt(sb
, DATA_FLAGS
) != m
->mount_opt
) {
1821 ext4_msg(sb
, KERN_ERR
,
1822 "Cannot change data mode on remount");
1826 clear_opt(sb
, DATA_FLAGS
);
1827 sbi
->s_mount_opt
|= m
->mount_opt
;
1830 } else if (m
->flags
& MOPT_QFMT
) {
1831 if (sb_any_quota_loaded(sb
) &&
1832 sbi
->s_jquota_fmt
!= m
->mount_opt
) {
1833 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled "
1834 "quota options when quota turned on");
1837 if (ext4_has_feature_quota(sb
)) {
1838 ext4_msg(sb
, KERN_INFO
,
1839 "Quota format mount options ignored "
1840 "when QUOTA feature is enabled");
1843 sbi
->s_jquota_fmt
= m
->mount_opt
;
1845 } else if (token
== Opt_dax
) {
1846 #ifdef CONFIG_FS_DAX
1847 ext4_msg(sb
, KERN_WARNING
,
1848 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1849 sbi
->s_mount_opt
|= m
->mount_opt
;
1851 ext4_msg(sb
, KERN_INFO
, "dax option not supported");
1854 } else if (token
== Opt_data_err_abort
) {
1855 sbi
->s_mount_opt
|= m
->mount_opt
;
1856 } else if (token
== Opt_data_err_ignore
) {
1857 sbi
->s_mount_opt
&= ~m
->mount_opt
;
1861 if (m
->flags
& MOPT_CLEAR
)
1863 else if (unlikely(!(m
->flags
& MOPT_SET
))) {
1864 ext4_msg(sb
, KERN_WARNING
,
1865 "buggy handling of option %s", opt
);
1870 sbi
->s_mount_opt
|= m
->mount_opt
;
1872 sbi
->s_mount_opt
&= ~m
->mount_opt
;
1877 static int parse_options(char *options
, struct super_block
*sb
,
1878 unsigned long *journal_devnum
,
1879 unsigned int *journal_ioprio
,
1882 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1884 substring_t args
[MAX_OPT_ARGS
];
1890 while ((p
= strsep(&options
, ",")) != NULL
) {
1894 * Initialize args struct so we know whether arg was
1895 * found; some options take optional arguments.
1897 args
[0].to
= args
[0].from
= NULL
;
1898 token
= match_token(p
, tokens
, args
);
1899 if (handle_mount_opt(sb
, p
, token
, args
, journal_devnum
,
1900 journal_ioprio
, is_remount
) < 0)
1905 * We do the test below only for project quotas. 'usrquota' and
1906 * 'grpquota' mount options are allowed even without quota feature
1907 * to support legacy quotas in quota files.
1909 if (test_opt(sb
, PRJQUOTA
) && !ext4_has_feature_project(sb
)) {
1910 ext4_msg(sb
, KERN_ERR
, "Project quota feature not enabled. "
1911 "Cannot enable project quota enforcement.");
1914 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1915 if (test_opt(sb
, USRQUOTA
) && sbi
->s_qf_names
[USRQUOTA
])
1916 clear_opt(sb
, USRQUOTA
);
1918 if (test_opt(sb
, GRPQUOTA
) && sbi
->s_qf_names
[GRPQUOTA
])
1919 clear_opt(sb
, GRPQUOTA
);
1921 if (test_opt(sb
, GRPQUOTA
) || test_opt(sb
, USRQUOTA
)) {
1922 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1927 if (!sbi
->s_jquota_fmt
) {
1928 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1934 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
1936 BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
1938 if (blocksize
< PAGE_SIZE
) {
1939 ext4_msg(sb
, KERN_ERR
, "can't mount with "
1940 "dioread_nolock if block size != PAGE_SIZE");
1947 static inline void ext4_show_quota_options(struct seq_file
*seq
,
1948 struct super_block
*sb
)
1950 #if defined(CONFIG_QUOTA)
1951 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1953 if (sbi
->s_jquota_fmt
) {
1956 switch (sbi
->s_jquota_fmt
) {
1967 seq_printf(seq
, ",jqfmt=%s", fmtname
);
1970 if (sbi
->s_qf_names
[USRQUOTA
])
1971 seq_show_option(seq
, "usrjquota", sbi
->s_qf_names
[USRQUOTA
]);
1973 if (sbi
->s_qf_names
[GRPQUOTA
])
1974 seq_show_option(seq
, "grpjquota", sbi
->s_qf_names
[GRPQUOTA
]);
1978 static const char *token2str(int token
)
1980 const struct match_token
*t
;
1982 for (t
= tokens
; t
->token
!= Opt_err
; t
++)
1983 if (t
->token
== token
&& !strchr(t
->pattern
, '='))
1990 * - it's set to a non-default value OR
1991 * - if the per-sb default is different from the global default
1993 static int _ext4_show_options(struct seq_file
*seq
, struct super_block
*sb
,
1996 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1997 struct ext4_super_block
*es
= sbi
->s_es
;
1998 int def_errors
, def_mount_opt
= nodefs
? 0 : sbi
->s_def_mount_opt
;
1999 const struct mount_opts
*m
;
2000 char sep
= nodefs
? '\n' : ',';
2002 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2003 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2005 if (sbi
->s_sb_block
!= 1)
2006 SEQ_OPTS_PRINT("sb=%llu", sbi
->s_sb_block
);
2008 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++) {
2009 int want_set
= m
->flags
& MOPT_SET
;
2010 if (((m
->flags
& (MOPT_SET
|MOPT_CLEAR
)) == 0) ||
2011 (m
->flags
& MOPT_CLEAR_ERR
))
2013 if (!(m
->mount_opt
& (sbi
->s_mount_opt
^ def_mount_opt
)))
2014 continue; /* skip if same as the default */
2016 (sbi
->s_mount_opt
& m
->mount_opt
) != m
->mount_opt
) ||
2017 (!want_set
&& (sbi
->s_mount_opt
& m
->mount_opt
)))
2018 continue; /* select Opt_noFoo vs Opt_Foo */
2019 SEQ_OPTS_PRINT("%s", token2str(m
->token
));
2022 if (nodefs
|| !uid_eq(sbi
->s_resuid
, make_kuid(&init_user_ns
, EXT4_DEF_RESUID
)) ||
2023 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
)
2024 SEQ_OPTS_PRINT("resuid=%u",
2025 from_kuid_munged(&init_user_ns
, sbi
->s_resuid
));
2026 if (nodefs
|| !gid_eq(sbi
->s_resgid
, make_kgid(&init_user_ns
, EXT4_DEF_RESGID
)) ||
2027 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
)
2028 SEQ_OPTS_PRINT("resgid=%u",
2029 from_kgid_munged(&init_user_ns
, sbi
->s_resgid
));
2030 def_errors
= nodefs
? -1 : le16_to_cpu(es
->s_errors
);
2031 if (test_opt(sb
, ERRORS_RO
) && def_errors
!= EXT4_ERRORS_RO
)
2032 SEQ_OPTS_PUTS("errors=remount-ro");
2033 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
2034 SEQ_OPTS_PUTS("errors=continue");
2035 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
2036 SEQ_OPTS_PUTS("errors=panic");
2037 if (nodefs
|| sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
)
2038 SEQ_OPTS_PRINT("commit=%lu", sbi
->s_commit_interval
/ HZ
);
2039 if (nodefs
|| sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
)
2040 SEQ_OPTS_PRINT("min_batch_time=%u", sbi
->s_min_batch_time
);
2041 if (nodefs
|| sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
)
2042 SEQ_OPTS_PRINT("max_batch_time=%u", sbi
->s_max_batch_time
);
2043 if (sb
->s_flags
& MS_I_VERSION
)
2044 SEQ_OPTS_PUTS("i_version");
2045 if (nodefs
|| sbi
->s_stripe
)
2046 SEQ_OPTS_PRINT("stripe=%lu", sbi
->s_stripe
);
2047 if (EXT4_MOUNT_DATA_FLAGS
& (sbi
->s_mount_opt
^ def_mount_opt
)) {
2048 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
2049 SEQ_OPTS_PUTS("data=journal");
2050 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
2051 SEQ_OPTS_PUTS("data=ordered");
2052 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
2053 SEQ_OPTS_PUTS("data=writeback");
2056 sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
2057 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2058 sbi
->s_inode_readahead_blks
);
2060 if (nodefs
|| (test_opt(sb
, INIT_INODE_TABLE
) &&
2061 (sbi
->s_li_wait_mult
!= EXT4_DEF_LI_WAIT_MULT
)))
2062 SEQ_OPTS_PRINT("init_itable=%u", sbi
->s_li_wait_mult
);
2063 if (nodefs
|| sbi
->s_max_dir_size_kb
)
2064 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi
->s_max_dir_size_kb
);
2065 if (test_opt(sb
, DATA_ERR_ABORT
))
2066 SEQ_OPTS_PUTS("data_err=abort");
2068 ext4_show_quota_options(seq
, sb
);
2072 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
)
2074 return _ext4_show_options(seq
, root
->d_sb
, 0);
2077 int ext4_seq_options_show(struct seq_file
*seq
, void *offset
)
2079 struct super_block
*sb
= seq
->private;
2082 seq_puts(seq
, (sb
->s_flags
& MS_RDONLY
) ? "ro" : "rw");
2083 rc
= _ext4_show_options(seq
, sb
, 1);
2084 seq_puts(seq
, "\n");
2088 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
2091 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2094 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
2095 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
2096 "forcing read-only mode");
2101 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
2102 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
2103 "running e2fsck is recommended");
2104 else if (sbi
->s_mount_state
& EXT4_ERROR_FS
)
2105 ext4_msg(sb
, KERN_WARNING
,
2106 "warning: mounting fs with errors, "
2107 "running e2fsck is recommended");
2108 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) > 0 &&
2109 le16_to_cpu(es
->s_mnt_count
) >=
2110 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
2111 ext4_msg(sb
, KERN_WARNING
,
2112 "warning: maximal mount count reached, "
2113 "running e2fsck is recommended");
2114 else if (le32_to_cpu(es
->s_checkinterval
) &&
2115 (le32_to_cpu(es
->s_lastcheck
) +
2116 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
2117 ext4_msg(sb
, KERN_WARNING
,
2118 "warning: checktime reached, "
2119 "running e2fsck is recommended");
2120 if (!sbi
->s_journal
)
2121 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
2122 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
2123 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
2124 le16_add_cpu(&es
->s_mnt_count
, 1);
2125 es
->s_mtime
= cpu_to_le32(get_seconds());
2126 ext4_update_dynamic_rev(sb
);
2128 ext4_set_feature_journal_needs_recovery(sb
);
2130 ext4_commit_super(sb
, 1);
2132 if (test_opt(sb
, DEBUG
))
2133 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
2134 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
2136 sbi
->s_groups_count
,
2137 EXT4_BLOCKS_PER_GROUP(sb
),
2138 EXT4_INODES_PER_GROUP(sb
),
2139 sbi
->s_mount_opt
, sbi
->s_mount_opt2
);
2141 cleancache_init_fs(sb
);
2145 int ext4_alloc_flex_bg_array(struct super_block
*sb
, ext4_group_t ngroup
)
2147 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2148 struct flex_groups
*new_groups
;
2151 if (!sbi
->s_log_groups_per_flex
)
2154 size
= ext4_flex_group(sbi
, ngroup
- 1) + 1;
2155 if (size
<= sbi
->s_flex_groups_allocated
)
2158 size
= roundup_pow_of_two(size
* sizeof(struct flex_groups
));
2159 new_groups
= kvzalloc(size
, GFP_KERNEL
);
2161 ext4_msg(sb
, KERN_ERR
, "not enough memory for %d flex groups",
2162 size
/ (int) sizeof(struct flex_groups
));
2166 if (sbi
->s_flex_groups
) {
2167 memcpy(new_groups
, sbi
->s_flex_groups
,
2168 (sbi
->s_flex_groups_allocated
*
2169 sizeof(struct flex_groups
)));
2170 kvfree(sbi
->s_flex_groups
);
2172 sbi
->s_flex_groups
= new_groups
;
2173 sbi
->s_flex_groups_allocated
= size
/ sizeof(struct flex_groups
);
2177 static int ext4_fill_flex_info(struct super_block
*sb
)
2179 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2180 struct ext4_group_desc
*gdp
= NULL
;
2181 ext4_group_t flex_group
;
2184 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
2185 if (sbi
->s_log_groups_per_flex
< 1 || sbi
->s_log_groups_per_flex
> 31) {
2186 sbi
->s_log_groups_per_flex
= 0;
2190 err
= ext4_alloc_flex_bg_array(sb
, sbi
->s_groups_count
);
2194 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
2195 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2197 flex_group
= ext4_flex_group(sbi
, i
);
2198 atomic_add(ext4_free_inodes_count(sb
, gdp
),
2199 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
2200 atomic64_add(ext4_free_group_clusters(sb
, gdp
),
2201 &sbi
->s_flex_groups
[flex_group
].free_clusters
);
2202 atomic_add(ext4_used_dirs_count(sb
, gdp
),
2203 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
2211 static __le16
ext4_group_desc_csum(struct super_block
*sb
, __u32 block_group
,
2212 struct ext4_group_desc
*gdp
)
2214 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
2216 __le32 le_group
= cpu_to_le32(block_group
);
2217 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2219 if (ext4_has_metadata_csum(sbi
->s_sb
)) {
2220 /* Use new metadata_csum algorithm */
2222 __u16 dummy_csum
= 0;
2224 csum32
= ext4_chksum(sbi
, sbi
->s_csum_seed
, (__u8
*)&le_group
,
2226 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)gdp
, offset
);
2227 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)&dummy_csum
,
2228 sizeof(dummy_csum
));
2229 offset
+= sizeof(dummy_csum
);
2230 if (offset
< sbi
->s_desc_size
)
2231 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)gdp
+ offset
,
2232 sbi
->s_desc_size
- offset
);
2234 crc
= csum32
& 0xFFFF;
2238 /* old crc16 code */
2239 if (!ext4_has_feature_gdt_csum(sb
))
2242 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
2243 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
2244 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
2245 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
2246 /* for checksum of struct ext4_group_desc do the rest...*/
2247 if (ext4_has_feature_64bit(sb
) &&
2248 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
2249 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
2250 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
2254 return cpu_to_le16(crc
);
2257 int ext4_group_desc_csum_verify(struct super_block
*sb
, __u32 block_group
,
2258 struct ext4_group_desc
*gdp
)
2260 if (ext4_has_group_desc_csum(sb
) &&
2261 (gdp
->bg_checksum
!= ext4_group_desc_csum(sb
, block_group
, gdp
)))
2267 void ext4_group_desc_csum_set(struct super_block
*sb
, __u32 block_group
,
2268 struct ext4_group_desc
*gdp
)
2270 if (!ext4_has_group_desc_csum(sb
))
2272 gdp
->bg_checksum
= ext4_group_desc_csum(sb
, block_group
, gdp
);
2275 /* Called at mount-time, super-block is locked */
2276 static int ext4_check_descriptors(struct super_block
*sb
,
2277 ext4_fsblk_t sb_block
,
2278 ext4_group_t
*first_not_zeroed
)
2280 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2281 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
2282 ext4_fsblk_t last_block
;
2283 ext4_fsblk_t block_bitmap
;
2284 ext4_fsblk_t inode_bitmap
;
2285 ext4_fsblk_t inode_table
;
2286 int flexbg_flag
= 0;
2287 ext4_group_t i
, grp
= sbi
->s_groups_count
;
2289 if (ext4_has_feature_flex_bg(sb
))
2292 ext4_debug("Checking group descriptors");
2294 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
2295 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2297 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
2298 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
2300 last_block
= first_block
+
2301 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2303 if ((grp
== sbi
->s_groups_count
) &&
2304 !(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2307 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
2308 if (block_bitmap
== sb_block
) {
2309 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2310 "Block bitmap for group %u overlaps "
2313 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
2314 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2315 "Block bitmap for group %u not in group "
2316 "(block %llu)!", i
, block_bitmap
);
2319 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
2320 if (inode_bitmap
== sb_block
) {
2321 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2322 "Inode bitmap for group %u overlaps "
2325 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
2326 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2327 "Inode bitmap for group %u not in group "
2328 "(block %llu)!", i
, inode_bitmap
);
2331 inode_table
= ext4_inode_table(sb
, gdp
);
2332 if (inode_table
== sb_block
) {
2333 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2334 "Inode table for group %u overlaps "
2337 if (inode_table
< first_block
||
2338 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
2339 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2340 "Inode table for group %u not in group "
2341 "(block %llu)!", i
, inode_table
);
2344 ext4_lock_group(sb
, i
);
2345 if (!ext4_group_desc_csum_verify(sb
, i
, gdp
)) {
2346 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2347 "Checksum for group %u failed (%u!=%u)",
2348 i
, le16_to_cpu(ext4_group_desc_csum(sb
, i
,
2349 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
2350 if (!(sb
->s_flags
& MS_RDONLY
)) {
2351 ext4_unlock_group(sb
, i
);
2355 ext4_unlock_group(sb
, i
);
2357 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
2359 if (NULL
!= first_not_zeroed
)
2360 *first_not_zeroed
= grp
;
2364 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2365 * the superblock) which were deleted from all directories, but held open by
2366 * a process at the time of a crash. We walk the list and try to delete these
2367 * inodes at recovery time (only with a read-write filesystem).
2369 * In order to keep the orphan inode chain consistent during traversal (in
2370 * case of crash during recovery), we link each inode into the superblock
2371 * orphan list_head and handle it the same way as an inode deletion during
2372 * normal operation (which journals the operations for us).
2374 * We only do an iget() and an iput() on each inode, which is very safe if we
2375 * accidentally point at an in-use or already deleted inode. The worst that
2376 * can happen in this case is that we get a "bit already cleared" message from
2377 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2378 * e2fsck was run on this filesystem, and it must have already done the orphan
2379 * inode cleanup for us, so we can safely abort without any further action.
2381 static void ext4_orphan_cleanup(struct super_block
*sb
,
2382 struct ext4_super_block
*es
)
2384 unsigned int s_flags
= sb
->s_flags
;
2385 int ret
, nr_orphans
= 0, nr_truncates
= 0;
2389 if (!es
->s_last_orphan
) {
2390 jbd_debug(4, "no orphan inodes to clean up\n");
2394 if (bdev_read_only(sb
->s_bdev
)) {
2395 ext4_msg(sb
, KERN_ERR
, "write access "
2396 "unavailable, skipping orphan cleanup");
2400 /* Check if feature set would not allow a r/w mount */
2401 if (!ext4_feature_set_ok(sb
, 0)) {
2402 ext4_msg(sb
, KERN_INFO
, "Skipping orphan cleanup due to "
2403 "unknown ROCOMPAT features");
2407 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2408 /* don't clear list on RO mount w/ errors */
2409 if (es
->s_last_orphan
&& !(s_flags
& MS_RDONLY
)) {
2410 ext4_msg(sb
, KERN_INFO
, "Errors on filesystem, "
2411 "clearing orphan list.\n");
2412 es
->s_last_orphan
= 0;
2414 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2418 if (s_flags
& MS_RDONLY
) {
2419 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
2420 sb
->s_flags
&= ~MS_RDONLY
;
2423 /* Needed for iput() to work correctly and not trash data */
2424 sb
->s_flags
|= MS_ACTIVE
;
2425 /* Turn on quotas so that they are updated correctly */
2426 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++) {
2427 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
2428 int ret
= ext4_quota_on_mount(sb
, i
);
2430 ext4_msg(sb
, KERN_ERR
,
2431 "Cannot turn on journaled "
2432 "quota: error %d", ret
);
2437 while (es
->s_last_orphan
) {
2438 struct inode
*inode
;
2441 * We may have encountered an error during cleanup; if
2442 * so, skip the rest.
2444 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2445 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2446 es
->s_last_orphan
= 0;
2450 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
2451 if (IS_ERR(inode
)) {
2452 es
->s_last_orphan
= 0;
2456 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
2457 dquot_initialize(inode
);
2458 if (inode
->i_nlink
) {
2459 if (test_opt(sb
, DEBUG
))
2460 ext4_msg(sb
, KERN_DEBUG
,
2461 "%s: truncating inode %lu to %lld bytes",
2462 __func__
, inode
->i_ino
, inode
->i_size
);
2463 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2464 inode
->i_ino
, inode
->i_size
);
2466 truncate_inode_pages(inode
->i_mapping
, inode
->i_size
);
2467 ret
= ext4_truncate(inode
);
2469 ext4_std_error(inode
->i_sb
, ret
);
2470 inode_unlock(inode
);
2473 if (test_opt(sb
, DEBUG
))
2474 ext4_msg(sb
, KERN_DEBUG
,
2475 "%s: deleting unreferenced inode %lu",
2476 __func__
, inode
->i_ino
);
2477 jbd_debug(2, "deleting unreferenced inode %lu\n",
2481 iput(inode
); /* The delete magic happens here! */
2484 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2487 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
2488 PLURAL(nr_orphans
));
2490 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
2491 PLURAL(nr_truncates
));
2493 /* Turn quotas off */
2494 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++) {
2495 if (sb_dqopt(sb
)->files
[i
])
2496 dquot_quota_off(sb
, i
);
2499 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
2503 * Maximal extent format file size.
2504 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2505 * extent format containers, within a sector_t, and within i_blocks
2506 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2507 * so that won't be a limiting factor.
2509 * However there is other limiting factor. We do store extents in the form
2510 * of starting block and length, hence the resulting length of the extent
2511 * covering maximum file size must fit into on-disk format containers as
2512 * well. Given that length is always by 1 unit bigger than max unit (because
2513 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2515 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2517 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
2520 loff_t upper_limit
= MAX_LFS_FILESIZE
;
2522 /* small i_blocks in vfs inode? */
2523 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2525 * CONFIG_LBDAF is not enabled implies the inode
2526 * i_block represent total blocks in 512 bytes
2527 * 32 == size of vfs inode i_blocks * 8
2529 upper_limit
= (1LL << 32) - 1;
2531 /* total blocks in file system block size */
2532 upper_limit
>>= (blkbits
- 9);
2533 upper_limit
<<= blkbits
;
2537 * 32-bit extent-start container, ee_block. We lower the maxbytes
2538 * by one fs block, so ee_len can cover the extent of maximum file
2541 res
= (1LL << 32) - 1;
2544 /* Sanity check against vm- & vfs- imposed limits */
2545 if (res
> upper_limit
)
2552 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2553 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2554 * We need to be 1 filesystem block less than the 2^48 sector limit.
2556 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2558 loff_t res
= EXT4_NDIR_BLOCKS
;
2561 /* This is calculated to be the largest file size for a dense, block
2562 * mapped file such that the file's total number of 512-byte sectors,
2563 * including data and all indirect blocks, does not exceed (2^48 - 1).
2565 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2566 * number of 512-byte sectors of the file.
2569 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2571 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2572 * the inode i_block field represents total file blocks in
2573 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2575 upper_limit
= (1LL << 32) - 1;
2577 /* total blocks in file system block size */
2578 upper_limit
>>= (bits
- 9);
2582 * We use 48 bit ext4_inode i_blocks
2583 * With EXT4_HUGE_FILE_FL set the i_blocks
2584 * represent total number of blocks in
2585 * file system block size
2587 upper_limit
= (1LL << 48) - 1;
2591 /* indirect blocks */
2593 /* double indirect blocks */
2594 meta_blocks
+= 1 + (1LL << (bits
-2));
2595 /* tripple indirect blocks */
2596 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2598 upper_limit
-= meta_blocks
;
2599 upper_limit
<<= bits
;
2601 res
+= 1LL << (bits
-2);
2602 res
+= 1LL << (2*(bits
-2));
2603 res
+= 1LL << (3*(bits
-2));
2605 if (res
> upper_limit
)
2608 if (res
> MAX_LFS_FILESIZE
)
2609 res
= MAX_LFS_FILESIZE
;
2614 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2615 ext4_fsblk_t logical_sb_block
, int nr
)
2617 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2618 ext4_group_t bg
, first_meta_bg
;
2621 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2623 if (!ext4_has_feature_meta_bg(sb
) || nr
< first_meta_bg
)
2624 return logical_sb_block
+ nr
+ 1;
2625 bg
= sbi
->s_desc_per_block
* nr
;
2626 if (ext4_bg_has_super(sb
, bg
))
2630 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2631 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2632 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2635 if (sb
->s_blocksize
== 1024 && nr
== 0 &&
2636 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_first_data_block
) == 0)
2639 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2643 * ext4_get_stripe_size: Get the stripe size.
2644 * @sbi: In memory super block info
2646 * If we have specified it via mount option, then
2647 * use the mount option value. If the value specified at mount time is
2648 * greater than the blocks per group use the super block value.
2649 * If the super block value is greater than blocks per group return 0.
2650 * Allocator needs it be less than blocks per group.
2653 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2655 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2656 unsigned long stripe_width
=
2657 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2660 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2661 ret
= sbi
->s_stripe
;
2662 else if (stripe_width
&& stripe_width
<= sbi
->s_blocks_per_group
)
2664 else if (stride
&& stride
<= sbi
->s_blocks_per_group
)
2670 * If the stripe width is 1, this makes no sense and
2671 * we set it to 0 to turn off stripe handling code.
2680 * Check whether this filesystem can be mounted based on
2681 * the features present and the RDONLY/RDWR mount requested.
2682 * Returns 1 if this filesystem can be mounted as requested,
2683 * 0 if it cannot be.
2685 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2687 if (ext4_has_unknown_ext4_incompat_features(sb
)) {
2688 ext4_msg(sb
, KERN_ERR
,
2689 "Couldn't mount because of "
2690 "unsupported optional features (%x)",
2691 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2692 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2699 if (ext4_has_feature_readonly(sb
)) {
2700 ext4_msg(sb
, KERN_INFO
, "filesystem is read-only");
2701 sb
->s_flags
|= MS_RDONLY
;
2705 /* Check that feature set is OK for a read-write mount */
2706 if (ext4_has_unknown_ext4_ro_compat_features(sb
)) {
2707 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2708 "unsupported optional features (%x)",
2709 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2710 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2714 * Large file size enabled file system can only be mounted
2715 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2717 if (ext4_has_feature_huge_file(sb
)) {
2718 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2719 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2720 "cannot be mounted RDWR without "
2725 if (ext4_has_feature_bigalloc(sb
) && !ext4_has_feature_extents(sb
)) {
2726 ext4_msg(sb
, KERN_ERR
,
2727 "Can't support bigalloc feature without "
2728 "extents feature\n");
2732 #ifndef CONFIG_QUOTA
2733 if (ext4_has_feature_quota(sb
) && !readonly
) {
2734 ext4_msg(sb
, KERN_ERR
,
2735 "Filesystem with quota feature cannot be mounted RDWR "
2736 "without CONFIG_QUOTA");
2739 if (ext4_has_feature_project(sb
) && !readonly
) {
2740 ext4_msg(sb
, KERN_ERR
,
2741 "Filesystem with project quota feature cannot be mounted RDWR "
2742 "without CONFIG_QUOTA");
2745 #endif /* CONFIG_QUOTA */
2750 * This function is called once a day if we have errors logged
2751 * on the file system
2753 static void print_daily_error_info(unsigned long arg
)
2755 struct super_block
*sb
= (struct super_block
*) arg
;
2756 struct ext4_sb_info
*sbi
;
2757 struct ext4_super_block
*es
;
2762 if (es
->s_error_count
)
2763 /* fsck newer than v1.41.13 is needed to clean this condition. */
2764 ext4_msg(sb
, KERN_NOTICE
, "error count since last fsck: %u",
2765 le32_to_cpu(es
->s_error_count
));
2766 if (es
->s_first_error_time
) {
2767 printk(KERN_NOTICE
"EXT4-fs (%s): initial error at time %u: %.*s:%d",
2768 sb
->s_id
, le32_to_cpu(es
->s_first_error_time
),
2769 (int) sizeof(es
->s_first_error_func
),
2770 es
->s_first_error_func
,
2771 le32_to_cpu(es
->s_first_error_line
));
2772 if (es
->s_first_error_ino
)
2773 printk(KERN_CONT
": inode %u",
2774 le32_to_cpu(es
->s_first_error_ino
));
2775 if (es
->s_first_error_block
)
2776 printk(KERN_CONT
": block %llu", (unsigned long long)
2777 le64_to_cpu(es
->s_first_error_block
));
2778 printk(KERN_CONT
"\n");
2780 if (es
->s_last_error_time
) {
2781 printk(KERN_NOTICE
"EXT4-fs (%s): last error at time %u: %.*s:%d",
2782 sb
->s_id
, le32_to_cpu(es
->s_last_error_time
),
2783 (int) sizeof(es
->s_last_error_func
),
2784 es
->s_last_error_func
,
2785 le32_to_cpu(es
->s_last_error_line
));
2786 if (es
->s_last_error_ino
)
2787 printk(KERN_CONT
": inode %u",
2788 le32_to_cpu(es
->s_last_error_ino
));
2789 if (es
->s_last_error_block
)
2790 printk(KERN_CONT
": block %llu", (unsigned long long)
2791 le64_to_cpu(es
->s_last_error_block
));
2792 printk(KERN_CONT
"\n");
2794 mod_timer(&sbi
->s_err_report
, jiffies
+ 24*60*60*HZ
); /* Once a day */
2797 /* Find next suitable group and run ext4_init_inode_table */
2798 static int ext4_run_li_request(struct ext4_li_request
*elr
)
2800 struct ext4_group_desc
*gdp
= NULL
;
2801 ext4_group_t group
, ngroups
;
2802 struct super_block
*sb
;
2803 unsigned long timeout
= 0;
2807 ngroups
= EXT4_SB(sb
)->s_groups_count
;
2809 for (group
= elr
->lr_next_group
; group
< ngroups
; group
++) {
2810 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2816 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2820 if (group
>= ngroups
)
2825 ret
= ext4_init_inode_table(sb
, group
,
2826 elr
->lr_timeout
? 0 : 1);
2827 if (elr
->lr_timeout
== 0) {
2828 timeout
= (jiffies
- timeout
) *
2829 elr
->lr_sbi
->s_li_wait_mult
;
2830 elr
->lr_timeout
= timeout
;
2832 elr
->lr_next_sched
= jiffies
+ elr
->lr_timeout
;
2833 elr
->lr_next_group
= group
+ 1;
2839 * Remove lr_request from the list_request and free the
2840 * request structure. Should be called with li_list_mtx held
2842 static void ext4_remove_li_request(struct ext4_li_request
*elr
)
2844 struct ext4_sb_info
*sbi
;
2851 list_del(&elr
->lr_request
);
2852 sbi
->s_li_request
= NULL
;
2856 static void ext4_unregister_li_request(struct super_block
*sb
)
2858 mutex_lock(&ext4_li_mtx
);
2859 if (!ext4_li_info
) {
2860 mutex_unlock(&ext4_li_mtx
);
2864 mutex_lock(&ext4_li_info
->li_list_mtx
);
2865 ext4_remove_li_request(EXT4_SB(sb
)->s_li_request
);
2866 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2867 mutex_unlock(&ext4_li_mtx
);
2870 static struct task_struct
*ext4_lazyinit_task
;
2873 * This is the function where ext4lazyinit thread lives. It walks
2874 * through the request list searching for next scheduled filesystem.
2875 * When such a fs is found, run the lazy initialization request
2876 * (ext4_rn_li_request) and keep track of the time spend in this
2877 * function. Based on that time we compute next schedule time of
2878 * the request. When walking through the list is complete, compute
2879 * next waking time and put itself into sleep.
2881 static int ext4_lazyinit_thread(void *arg
)
2883 struct ext4_lazy_init
*eli
= (struct ext4_lazy_init
*)arg
;
2884 struct list_head
*pos
, *n
;
2885 struct ext4_li_request
*elr
;
2886 unsigned long next_wakeup
, cur
;
2888 BUG_ON(NULL
== eli
);
2892 next_wakeup
= MAX_JIFFY_OFFSET
;
2894 mutex_lock(&eli
->li_list_mtx
);
2895 if (list_empty(&eli
->li_request_list
)) {
2896 mutex_unlock(&eli
->li_list_mtx
);
2899 list_for_each_safe(pos
, n
, &eli
->li_request_list
) {
2902 elr
= list_entry(pos
, struct ext4_li_request
,
2905 if (time_before(jiffies
, elr
->lr_next_sched
)) {
2906 if (time_before(elr
->lr_next_sched
, next_wakeup
))
2907 next_wakeup
= elr
->lr_next_sched
;
2910 if (down_read_trylock(&elr
->lr_super
->s_umount
)) {
2911 if (sb_start_write_trylock(elr
->lr_super
)) {
2914 * We hold sb->s_umount, sb can not
2915 * be removed from the list, it is
2916 * now safe to drop li_list_mtx
2918 mutex_unlock(&eli
->li_list_mtx
);
2919 err
= ext4_run_li_request(elr
);
2920 sb_end_write(elr
->lr_super
);
2921 mutex_lock(&eli
->li_list_mtx
);
2924 up_read((&elr
->lr_super
->s_umount
));
2926 /* error, remove the lazy_init job */
2928 ext4_remove_li_request(elr
);
2932 elr
->lr_next_sched
= jiffies
+
2934 % (EXT4_DEF_LI_MAX_START_DELAY
* HZ
));
2936 if (time_before(elr
->lr_next_sched
, next_wakeup
))
2937 next_wakeup
= elr
->lr_next_sched
;
2939 mutex_unlock(&eli
->li_list_mtx
);
2944 if ((time_after_eq(cur
, next_wakeup
)) ||
2945 (MAX_JIFFY_OFFSET
== next_wakeup
)) {
2950 schedule_timeout_interruptible(next_wakeup
- cur
);
2952 if (kthread_should_stop()) {
2953 ext4_clear_request_list();
2960 * It looks like the request list is empty, but we need
2961 * to check it under the li_list_mtx lock, to prevent any
2962 * additions into it, and of course we should lock ext4_li_mtx
2963 * to atomically free the list and ext4_li_info, because at
2964 * this point another ext4 filesystem could be registering
2967 mutex_lock(&ext4_li_mtx
);
2968 mutex_lock(&eli
->li_list_mtx
);
2969 if (!list_empty(&eli
->li_request_list
)) {
2970 mutex_unlock(&eli
->li_list_mtx
);
2971 mutex_unlock(&ext4_li_mtx
);
2974 mutex_unlock(&eli
->li_list_mtx
);
2975 kfree(ext4_li_info
);
2976 ext4_li_info
= NULL
;
2977 mutex_unlock(&ext4_li_mtx
);
2982 static void ext4_clear_request_list(void)
2984 struct list_head
*pos
, *n
;
2985 struct ext4_li_request
*elr
;
2987 mutex_lock(&ext4_li_info
->li_list_mtx
);
2988 list_for_each_safe(pos
, n
, &ext4_li_info
->li_request_list
) {
2989 elr
= list_entry(pos
, struct ext4_li_request
,
2991 ext4_remove_li_request(elr
);
2993 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2996 static int ext4_run_lazyinit_thread(void)
2998 ext4_lazyinit_task
= kthread_run(ext4_lazyinit_thread
,
2999 ext4_li_info
, "ext4lazyinit");
3000 if (IS_ERR(ext4_lazyinit_task
)) {
3001 int err
= PTR_ERR(ext4_lazyinit_task
);
3002 ext4_clear_request_list();
3003 kfree(ext4_li_info
);
3004 ext4_li_info
= NULL
;
3005 printk(KERN_CRIT
"EXT4-fs: error %d creating inode table "
3006 "initialization thread\n",
3010 ext4_li_info
->li_state
|= EXT4_LAZYINIT_RUNNING
;
3015 * Check whether it make sense to run itable init. thread or not.
3016 * If there is at least one uninitialized inode table, return
3017 * corresponding group number, else the loop goes through all
3018 * groups and return total number of groups.
3020 static ext4_group_t
ext4_has_uninit_itable(struct super_block
*sb
)
3022 ext4_group_t group
, ngroups
= EXT4_SB(sb
)->s_groups_count
;
3023 struct ext4_group_desc
*gdp
= NULL
;
3025 for (group
= 0; group
< ngroups
; group
++) {
3026 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
3030 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
3037 static int ext4_li_info_new(void)
3039 struct ext4_lazy_init
*eli
= NULL
;
3041 eli
= kzalloc(sizeof(*eli
), GFP_KERNEL
);
3045 INIT_LIST_HEAD(&eli
->li_request_list
);
3046 mutex_init(&eli
->li_list_mtx
);
3048 eli
->li_state
|= EXT4_LAZYINIT_QUIT
;
3055 static struct ext4_li_request
*ext4_li_request_new(struct super_block
*sb
,
3058 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3059 struct ext4_li_request
*elr
;
3061 elr
= kzalloc(sizeof(*elr
), GFP_KERNEL
);
3067 elr
->lr_next_group
= start
;
3070 * Randomize first schedule time of the request to
3071 * spread the inode table initialization requests
3074 elr
->lr_next_sched
= jiffies
+ (prandom_u32() %
3075 (EXT4_DEF_LI_MAX_START_DELAY
* HZ
));
3079 int ext4_register_li_request(struct super_block
*sb
,
3080 ext4_group_t first_not_zeroed
)
3082 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3083 struct ext4_li_request
*elr
= NULL
;
3084 ext4_group_t ngroups
= EXT4_SB(sb
)->s_groups_count
;
3087 mutex_lock(&ext4_li_mtx
);
3088 if (sbi
->s_li_request
!= NULL
) {
3090 * Reset timeout so it can be computed again, because
3091 * s_li_wait_mult might have changed.
3093 sbi
->s_li_request
->lr_timeout
= 0;
3097 if (first_not_zeroed
== ngroups
||
3098 (sb
->s_flags
& MS_RDONLY
) ||
3099 !test_opt(sb
, INIT_INODE_TABLE
))
3102 elr
= ext4_li_request_new(sb
, first_not_zeroed
);
3108 if (NULL
== ext4_li_info
) {
3109 ret
= ext4_li_info_new();
3114 mutex_lock(&ext4_li_info
->li_list_mtx
);
3115 list_add(&elr
->lr_request
, &ext4_li_info
->li_request_list
);
3116 mutex_unlock(&ext4_li_info
->li_list_mtx
);
3118 sbi
->s_li_request
= elr
;
3120 * set elr to NULL here since it has been inserted to
3121 * the request_list and the removal and free of it is
3122 * handled by ext4_clear_request_list from now on.
3126 if (!(ext4_li_info
->li_state
& EXT4_LAZYINIT_RUNNING
)) {
3127 ret
= ext4_run_lazyinit_thread();
3132 mutex_unlock(&ext4_li_mtx
);
3139 * We do not need to lock anything since this is called on
3142 static void ext4_destroy_lazyinit_thread(void)
3145 * If thread exited earlier
3146 * there's nothing to be done.
3148 if (!ext4_li_info
|| !ext4_lazyinit_task
)
3151 kthread_stop(ext4_lazyinit_task
);
3154 static int set_journal_csum_feature_set(struct super_block
*sb
)
3157 int compat
, incompat
;
3158 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3160 if (ext4_has_metadata_csum(sb
)) {
3161 /* journal checksum v3 */
3163 incompat
= JBD2_FEATURE_INCOMPAT_CSUM_V3
;
3165 /* journal checksum v1 */
3166 compat
= JBD2_FEATURE_COMPAT_CHECKSUM
;
3170 jbd2_journal_clear_features(sbi
->s_journal
,
3171 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
3172 JBD2_FEATURE_INCOMPAT_CSUM_V3
|
3173 JBD2_FEATURE_INCOMPAT_CSUM_V2
);
3174 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
3175 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3177 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
|
3179 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
3180 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3183 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3184 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3186 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3187 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3194 * Note: calculating the overhead so we can be compatible with
3195 * historical BSD practice is quite difficult in the face of
3196 * clusters/bigalloc. This is because multiple metadata blocks from
3197 * different block group can end up in the same allocation cluster.
3198 * Calculating the exact overhead in the face of clustered allocation
3199 * requires either O(all block bitmaps) in memory or O(number of block
3200 * groups**2) in time. We will still calculate the superblock for
3201 * older file systems --- and if we come across with a bigalloc file
3202 * system with zero in s_overhead_clusters the estimate will be close to
3203 * correct especially for very large cluster sizes --- but for newer
3204 * file systems, it's better to calculate this figure once at mkfs
3205 * time, and store it in the superblock. If the superblock value is
3206 * present (even for non-bigalloc file systems), we will use it.
3208 static int count_overhead(struct super_block
*sb
, ext4_group_t grp
,
3211 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3212 struct ext4_group_desc
*gdp
;
3213 ext4_fsblk_t first_block
, last_block
, b
;
3214 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3215 int s
, j
, count
= 0;
3217 if (!ext4_has_feature_bigalloc(sb
))
3218 return (ext4_bg_has_super(sb
, grp
) + ext4_bg_num_gdb(sb
, grp
) +
3219 sbi
->s_itb_per_group
+ 2);
3221 first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
) +
3222 (grp
* EXT4_BLOCKS_PER_GROUP(sb
));
3223 last_block
= first_block
+ EXT4_BLOCKS_PER_GROUP(sb
) - 1;
3224 for (i
= 0; i
< ngroups
; i
++) {
3225 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
3226 b
= ext4_block_bitmap(sb
, gdp
);
3227 if (b
>= first_block
&& b
<= last_block
) {
3228 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3231 b
= ext4_inode_bitmap(sb
, gdp
);
3232 if (b
>= first_block
&& b
<= last_block
) {
3233 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3236 b
= ext4_inode_table(sb
, gdp
);
3237 if (b
>= first_block
&& b
+ sbi
->s_itb_per_group
<= last_block
)
3238 for (j
= 0; j
< sbi
->s_itb_per_group
; j
++, b
++) {
3239 int c
= EXT4_B2C(sbi
, b
- first_block
);
3240 ext4_set_bit(c
, buf
);
3246 if (ext4_bg_has_super(sb
, grp
)) {
3247 ext4_set_bit(s
++, buf
);
3250 j
= ext4_bg_num_gdb(sb
, grp
);
3251 if (s
+ j
> EXT4_BLOCKS_PER_GROUP(sb
)) {
3252 ext4_error(sb
, "Invalid number of block group "
3253 "descriptor blocks: %d", j
);
3254 j
= EXT4_BLOCKS_PER_GROUP(sb
) - s
;
3258 ext4_set_bit(EXT4_B2C(sbi
, s
++), buf
);
3262 return EXT4_CLUSTERS_PER_GROUP(sb
) -
3263 ext4_count_free(buf
, EXT4_CLUSTERS_PER_GROUP(sb
) / 8);
3267 * Compute the overhead and stash it in sbi->s_overhead
3269 int ext4_calculate_overhead(struct super_block
*sb
)
3271 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3272 struct ext4_super_block
*es
= sbi
->s_es
;
3273 struct inode
*j_inode
;
3274 unsigned int j_blocks
, j_inum
= le32_to_cpu(es
->s_journal_inum
);
3275 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3276 ext4_fsblk_t overhead
= 0;
3277 char *buf
= (char *) get_zeroed_page(GFP_NOFS
);
3283 * Compute the overhead (FS structures). This is constant
3284 * for a given filesystem unless the number of block groups
3285 * changes so we cache the previous value until it does.
3289 * All of the blocks before first_data_block are overhead
3291 overhead
= EXT4_B2C(sbi
, le32_to_cpu(es
->s_first_data_block
));
3294 * Add the overhead found in each block group
3296 for (i
= 0; i
< ngroups
; i
++) {
3299 blks
= count_overhead(sb
, i
, buf
);
3302 memset(buf
, 0, PAGE_SIZE
);
3307 * Add the internal journal blocks whether the journal has been
3310 if (sbi
->s_journal
&& !sbi
->journal_bdev
)
3311 overhead
+= EXT4_NUM_B2C(sbi
, sbi
->s_journal
->j_maxlen
);
3312 else if (ext4_has_feature_journal(sb
) && !sbi
->s_journal
) {
3313 j_inode
= ext4_get_journal_inode(sb
, j_inum
);
3315 j_blocks
= j_inode
->i_size
>> sb
->s_blocksize_bits
;
3316 overhead
+= EXT4_NUM_B2C(sbi
, j_blocks
);
3319 ext4_msg(sb
, KERN_ERR
, "can't get journal size");
3322 sbi
->s_overhead
= overhead
;
3324 free_page((unsigned long) buf
);
3328 static void ext4_set_resv_clusters(struct super_block
*sb
)
3330 ext4_fsblk_t resv_clusters
;
3331 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3334 * There's no need to reserve anything when we aren't using extents.
3335 * The space estimates are exact, there are no unwritten extents,
3336 * hole punching doesn't need new metadata... This is needed especially
3337 * to keep ext2/3 backward compatibility.
3339 if (!ext4_has_feature_extents(sb
))
3342 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3343 * This should cover the situations where we can not afford to run
3344 * out of space like for example punch hole, or converting
3345 * unwritten extents in delalloc path. In most cases such
3346 * allocation would require 1, or 2 blocks, higher numbers are
3349 resv_clusters
= (ext4_blocks_count(sbi
->s_es
) >>
3350 sbi
->s_cluster_bits
);
3352 do_div(resv_clusters
, 50);
3353 resv_clusters
= min_t(ext4_fsblk_t
, resv_clusters
, 4096);
3355 atomic64_set(&sbi
->s_resv_clusters
, resv_clusters
);
3358 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
3360 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
3361 struct buffer_head
*bh
;
3362 struct ext4_super_block
*es
= NULL
;
3363 struct ext4_sb_info
*sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
3365 ext4_fsblk_t sb_block
= get_sb_block(&data
);
3366 ext4_fsblk_t logical_sb_block
;
3367 unsigned long offset
= 0;
3368 unsigned long journal_devnum
= 0;
3369 unsigned long def_mount_opts
;
3373 int blocksize
, clustersize
;
3374 unsigned int db_count
;
3376 int needs_recovery
, has_huge_files
, has_bigalloc
;
3379 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3380 ext4_group_t first_not_zeroed
;
3382 if ((data
&& !orig_data
) || !sbi
)
3385 sbi
->s_blockgroup_lock
=
3386 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
3387 if (!sbi
->s_blockgroup_lock
)
3390 sb
->s_fs_info
= sbi
;
3392 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
3393 sbi
->s_sb_block
= sb_block
;
3394 if (sb
->s_bdev
->bd_part
)
3395 sbi
->s_sectors_written_start
=
3396 part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]);
3398 /* Cleanup superblock name */
3399 strreplace(sb
->s_id
, '/', '!');
3401 /* -EINVAL is default */
3403 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
3405 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
3410 * The ext4 superblock will not be buffer aligned for other than 1kB
3411 * block sizes. We need to calculate the offset from buffer start.
3413 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
3414 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3415 offset
= do_div(logical_sb_block
, blocksize
);
3417 logical_sb_block
= sb_block
;
3420 if (!(bh
= sb_bread_unmovable(sb
, logical_sb_block
))) {
3421 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
3425 * Note: s_es must be initialized as soon as possible because
3426 * some ext4 macro-instructions depend on its value
3428 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
3430 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
3431 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
3433 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
3435 /* Warn if metadata_csum and gdt_csum are both set. */
3436 if (ext4_has_feature_metadata_csum(sb
) &&
3437 ext4_has_feature_gdt_csum(sb
))
3438 ext4_warning(sb
, "metadata_csum and uninit_bg are "
3439 "redundant flags; please run fsck.");
3441 /* Check for a known checksum algorithm */
3442 if (!ext4_verify_csum_type(sb
, es
)) {
3443 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3444 "unknown checksum algorithm.");
3449 /* Load the checksum driver */
3450 if (ext4_has_feature_metadata_csum(sb
)) {
3451 sbi
->s_chksum_driver
= crypto_alloc_shash("crc32c", 0, 0);
3452 if (IS_ERR(sbi
->s_chksum_driver
)) {
3453 ext4_msg(sb
, KERN_ERR
, "Cannot load crc32c driver.");
3454 ret
= PTR_ERR(sbi
->s_chksum_driver
);
3455 sbi
->s_chksum_driver
= NULL
;
3460 /* Check superblock checksum */
3461 if (!ext4_superblock_csum_verify(sb
, es
)) {
3462 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3463 "invalid superblock checksum. Run e2fsck?");
3469 /* Precompute checksum seed for all metadata */
3470 if (ext4_has_feature_csum_seed(sb
))
3471 sbi
->s_csum_seed
= le32_to_cpu(es
->s_checksum_seed
);
3472 else if (ext4_has_metadata_csum(sb
))
3473 sbi
->s_csum_seed
= ext4_chksum(sbi
, ~0, es
->s_uuid
,
3474 sizeof(es
->s_uuid
));
3476 /* Set defaults before we parse the mount options */
3477 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
3478 set_opt(sb
, INIT_INODE_TABLE
);
3479 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
3481 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
3483 if (def_mount_opts
& EXT4_DEFM_UID16
)
3484 set_opt(sb
, NO_UID32
);
3485 /* xattr user namespace & acls are now defaulted on */
3486 set_opt(sb
, XATTR_USER
);
3487 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3488 set_opt(sb
, POSIX_ACL
);
3490 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3491 if (ext4_has_metadata_csum(sb
))
3492 set_opt(sb
, JOURNAL_CHECKSUM
);
3494 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
3495 set_opt(sb
, JOURNAL_DATA
);
3496 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
3497 set_opt(sb
, ORDERED_DATA
);
3498 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
3499 set_opt(sb
, WRITEBACK_DATA
);
3501 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
3502 set_opt(sb
, ERRORS_PANIC
);
3503 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
3504 set_opt(sb
, ERRORS_CONT
);
3506 set_opt(sb
, ERRORS_RO
);
3507 /* block_validity enabled by default; disable with noblock_validity */
3508 set_opt(sb
, BLOCK_VALIDITY
);
3509 if (def_mount_opts
& EXT4_DEFM_DISCARD
)
3510 set_opt(sb
, DISCARD
);
3512 sbi
->s_resuid
= make_kuid(&init_user_ns
, le16_to_cpu(es
->s_def_resuid
));
3513 sbi
->s_resgid
= make_kgid(&init_user_ns
, le16_to_cpu(es
->s_def_resgid
));
3514 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
3515 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
3516 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
3518 if ((def_mount_opts
& EXT4_DEFM_NOBARRIER
) == 0)
3519 set_opt(sb
, BARRIER
);
3522 * enable delayed allocation by default
3523 * Use -o nodelalloc to turn it off
3525 if (!IS_EXT3_SB(sb
) && !IS_EXT2_SB(sb
) &&
3526 ((def_mount_opts
& EXT4_DEFM_NODELALLOC
) == 0))
3527 set_opt(sb
, DELALLOC
);
3530 * set default s_li_wait_mult for lazyinit, for the case there is
3531 * no mount option specified.
3533 sbi
->s_li_wait_mult
= EXT4_DEF_LI_WAIT_MULT
;
3535 if (sbi
->s_es
->s_mount_opts
[0]) {
3536 char *s_mount_opts
= kstrndup(sbi
->s_es
->s_mount_opts
,
3537 sizeof(sbi
->s_es
->s_mount_opts
),
3541 if (!parse_options(s_mount_opts
, sb
, &journal_devnum
,
3542 &journal_ioprio
, 0)) {
3543 ext4_msg(sb
, KERN_WARNING
,
3544 "failed to parse options in superblock: %s",
3547 kfree(s_mount_opts
);
3549 sbi
->s_def_mount_opt
= sbi
->s_mount_opt
;
3550 if (!parse_options((char *) data
, sb
, &journal_devnum
,
3551 &journal_ioprio
, 0))
3554 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
3555 printk_once(KERN_WARNING
"EXT4-fs: Warning: mounting "
3556 "with data=journal disables delayed "
3557 "allocation and O_DIRECT support!\n");
3558 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
3559 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3560 "both data=journal and delalloc");
3563 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
3564 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3565 "both data=journal and dioread_nolock");
3568 if (test_opt(sb
, DAX
)) {
3569 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3570 "both data=journal and dax");
3573 if (ext4_has_feature_encrypt(sb
)) {
3574 ext4_msg(sb
, KERN_WARNING
,
3575 "encrypted files will use data=ordered "
3576 "instead of data journaling mode");
3578 if (test_opt(sb
, DELALLOC
))
3579 clear_opt(sb
, DELALLOC
);
3581 sb
->s_iflags
|= SB_I_CGROUPWB
;
3584 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3585 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
3587 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
3588 (ext4_has_compat_features(sb
) ||
3589 ext4_has_ro_compat_features(sb
) ||
3590 ext4_has_incompat_features(sb
)))
3591 ext4_msg(sb
, KERN_WARNING
,
3592 "feature flags set on rev 0 fs, "
3593 "running e2fsck is recommended");
3595 if (es
->s_creator_os
== cpu_to_le32(EXT4_OS_HURD
)) {
3596 set_opt2(sb
, HURD_COMPAT
);
3597 if (ext4_has_feature_64bit(sb
)) {
3598 ext4_msg(sb
, KERN_ERR
,
3599 "The Hurd can't support 64-bit file systems");
3604 if (IS_EXT2_SB(sb
)) {
3605 if (ext2_feature_set_ok(sb
))
3606 ext4_msg(sb
, KERN_INFO
, "mounting ext2 file system "
3607 "using the ext4 subsystem");
3609 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext2 due "
3610 "to feature incompatibilities");
3615 if (IS_EXT3_SB(sb
)) {
3616 if (ext3_feature_set_ok(sb
))
3617 ext4_msg(sb
, KERN_INFO
, "mounting ext3 file system "
3618 "using the ext4 subsystem");
3620 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext3 due "
3621 "to feature incompatibilities");
3627 * Check feature flags regardless of the revision level, since we
3628 * previously didn't change the revision level when setting the flags,
3629 * so there is a chance incompat flags are set on a rev 0 filesystem.
3631 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
3634 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
3635 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
3636 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
3637 ext4_msg(sb
, KERN_ERR
,
3638 "Unsupported filesystem blocksize %d (%d log_block_size)",
3639 blocksize
, le32_to_cpu(es
->s_log_block_size
));
3642 if (le32_to_cpu(es
->s_log_block_size
) >
3643 (EXT4_MAX_BLOCK_LOG_SIZE
- EXT4_MIN_BLOCK_LOG_SIZE
)) {
3644 ext4_msg(sb
, KERN_ERR
,
3645 "Invalid log block size: %u",
3646 le32_to_cpu(es
->s_log_block_size
));
3650 if (le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
) > (blocksize
/ 4)) {
3651 ext4_msg(sb
, KERN_ERR
,
3652 "Number of reserved GDT blocks insanely large: %d",
3653 le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
));
3657 if (sbi
->s_mount_opt
& EXT4_MOUNT_DAX
) {
3658 err
= bdev_dax_supported(sb
, blocksize
);
3663 if (ext4_has_feature_encrypt(sb
) && es
->s_encryption_level
) {
3664 ext4_msg(sb
, KERN_ERR
, "Unsupported encryption level %d",
3665 es
->s_encryption_level
);
3669 if (sb
->s_blocksize
!= blocksize
) {
3670 /* Validate the filesystem blocksize */
3671 if (!sb_set_blocksize(sb
, blocksize
)) {
3672 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
3678 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3679 offset
= do_div(logical_sb_block
, blocksize
);
3680 bh
= sb_bread_unmovable(sb
, logical_sb_block
);
3682 ext4_msg(sb
, KERN_ERR
,
3683 "Can't read superblock on 2nd try");
3686 es
= (struct ext4_super_block
*)(bh
->b_data
+ offset
);
3688 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
3689 ext4_msg(sb
, KERN_ERR
,
3690 "Magic mismatch, very weird!");
3695 has_huge_files
= ext4_has_feature_huge_file(sb
);
3696 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
3698 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
3700 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
3701 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
3702 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
3704 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
3705 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
3706 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
3707 (!is_power_of_2(sbi
->s_inode_size
)) ||
3708 (sbi
->s_inode_size
> blocksize
)) {
3709 ext4_msg(sb
, KERN_ERR
,
3710 "unsupported inode size: %d",
3714 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
3715 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
3718 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
3719 if (ext4_has_feature_64bit(sb
)) {
3720 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
3721 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
3722 !is_power_of_2(sbi
->s_desc_size
)) {
3723 ext4_msg(sb
, KERN_ERR
,
3724 "unsupported descriptor size %lu",
3729 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
3731 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
3732 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
3734 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
3735 if (sbi
->s_inodes_per_block
== 0)
3737 if (sbi
->s_inodes_per_group
< sbi
->s_inodes_per_block
||
3738 sbi
->s_inodes_per_group
> blocksize
* 8) {
3739 ext4_msg(sb
, KERN_ERR
, "invalid inodes per group: %lu\n",
3740 sbi
->s_blocks_per_group
);
3743 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
3744 sbi
->s_inodes_per_block
;
3745 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
3747 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3748 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
3749 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
3751 for (i
= 0; i
< 4; i
++)
3752 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
3753 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
3754 if (ext4_has_feature_dir_index(sb
)) {
3755 i
= le32_to_cpu(es
->s_flags
);
3756 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
3757 sbi
->s_hash_unsigned
= 3;
3758 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
3759 #ifdef __CHAR_UNSIGNED__
3760 if (!(sb
->s_flags
& MS_RDONLY
))
3762 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
3763 sbi
->s_hash_unsigned
= 3;
3765 if (!(sb
->s_flags
& MS_RDONLY
))
3767 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
3772 /* Handle clustersize */
3773 clustersize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_cluster_size
);
3774 has_bigalloc
= ext4_has_feature_bigalloc(sb
);
3776 if (clustersize
< blocksize
) {
3777 ext4_msg(sb
, KERN_ERR
,
3778 "cluster size (%d) smaller than "
3779 "block size (%d)", clustersize
, blocksize
);
3782 if (le32_to_cpu(es
->s_log_cluster_size
) >
3783 (EXT4_MAX_CLUSTER_LOG_SIZE
- EXT4_MIN_BLOCK_LOG_SIZE
)) {
3784 ext4_msg(sb
, KERN_ERR
,
3785 "Invalid log cluster size: %u",
3786 le32_to_cpu(es
->s_log_cluster_size
));
3789 sbi
->s_cluster_bits
= le32_to_cpu(es
->s_log_cluster_size
) -
3790 le32_to_cpu(es
->s_log_block_size
);
3791 sbi
->s_clusters_per_group
=
3792 le32_to_cpu(es
->s_clusters_per_group
);
3793 if (sbi
->s_clusters_per_group
> blocksize
* 8) {
3794 ext4_msg(sb
, KERN_ERR
,
3795 "#clusters per group too big: %lu",
3796 sbi
->s_clusters_per_group
);
3799 if (sbi
->s_blocks_per_group
!=
3800 (sbi
->s_clusters_per_group
* (clustersize
/ blocksize
))) {
3801 ext4_msg(sb
, KERN_ERR
, "blocks per group (%lu) and "
3802 "clusters per group (%lu) inconsistent",
3803 sbi
->s_blocks_per_group
,
3804 sbi
->s_clusters_per_group
);
3808 if (clustersize
!= blocksize
) {
3809 ext4_warning(sb
, "fragment/cluster size (%d) != "
3810 "block size (%d)", clustersize
,
3812 clustersize
= blocksize
;
3814 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
3815 ext4_msg(sb
, KERN_ERR
,
3816 "#blocks per group too big: %lu",
3817 sbi
->s_blocks_per_group
);
3820 sbi
->s_clusters_per_group
= sbi
->s_blocks_per_group
;
3821 sbi
->s_cluster_bits
= 0;
3823 sbi
->s_cluster_ratio
= clustersize
/ blocksize
;
3825 /* Do we have standard group size of clustersize * 8 blocks ? */
3826 if (sbi
->s_blocks_per_group
== clustersize
<< 3)
3827 set_opt2(sb
, STD_GROUP_SIZE
);
3830 * Test whether we have more sectors than will fit in sector_t,
3831 * and whether the max offset is addressable by the page cache.
3833 err
= generic_check_addressable(sb
->s_blocksize_bits
,
3834 ext4_blocks_count(es
));
3836 ext4_msg(sb
, KERN_ERR
, "filesystem"
3837 " too large to mount safely on this system");
3838 if (sizeof(sector_t
) < 8)
3839 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
3843 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
3846 /* check blocks count against device size */
3847 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
3848 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
3849 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
3850 "exceeds size of device (%llu blocks)",
3851 ext4_blocks_count(es
), blocks_count
);
3856 * It makes no sense for the first data block to be beyond the end
3857 * of the filesystem.
3859 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
3860 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data "
3861 "block %u is beyond end of filesystem (%llu)",
3862 le32_to_cpu(es
->s_first_data_block
),
3863 ext4_blocks_count(es
));
3866 blocks_count
= (ext4_blocks_count(es
) -
3867 le32_to_cpu(es
->s_first_data_block
) +
3868 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
3869 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
3870 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
3871 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
3872 "(block count %llu, first data block %u, "
3873 "blocks per group %lu)", sbi
->s_groups_count
,
3874 ext4_blocks_count(es
),
3875 le32_to_cpu(es
->s_first_data_block
),
3876 EXT4_BLOCKS_PER_GROUP(sb
));
3879 sbi
->s_groups_count
= blocks_count
;
3880 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
3881 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
3882 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
3883 EXT4_DESC_PER_BLOCK(sb
);
3884 if (ext4_has_feature_meta_bg(sb
)) {
3885 if (le32_to_cpu(es
->s_first_meta_bg
) > db_count
) {
3886 ext4_msg(sb
, KERN_WARNING
,
3887 "first meta block group too large: %u "
3888 "(group descriptor block count %u)",
3889 le32_to_cpu(es
->s_first_meta_bg
), db_count
);
3893 sbi
->s_group_desc
= kvmalloc(db_count
*
3894 sizeof(struct buffer_head
*),
3896 if (sbi
->s_group_desc
== NULL
) {
3897 ext4_msg(sb
, KERN_ERR
, "not enough memory");
3902 bgl_lock_init(sbi
->s_blockgroup_lock
);
3904 /* Pre-read the descriptors into the buffer cache */
3905 for (i
= 0; i
< db_count
; i
++) {
3906 block
= descriptor_loc(sb
, logical_sb_block
, i
);
3907 sb_breadahead(sb
, block
);
3910 for (i
= 0; i
< db_count
; i
++) {
3911 block
= descriptor_loc(sb
, logical_sb_block
, i
);
3912 sbi
->s_group_desc
[i
] = sb_bread_unmovable(sb
, block
);
3913 if (!sbi
->s_group_desc
[i
]) {
3914 ext4_msg(sb
, KERN_ERR
,
3915 "can't read group descriptor %d", i
);
3920 if (!ext4_check_descriptors(sb
, logical_sb_block
, &first_not_zeroed
)) {
3921 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
3922 ret
= -EFSCORRUPTED
;
3926 sbi
->s_gdb_count
= db_count
;
3927 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
3928 spin_lock_init(&sbi
->s_next_gen_lock
);
3930 setup_timer(&sbi
->s_err_report
, print_daily_error_info
,
3931 (unsigned long) sb
);
3933 /* Register extent status tree shrinker */
3934 if (ext4_es_register_shrinker(sbi
))
3937 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
3938 sbi
->s_extent_max_zeroout_kb
= 32;
3941 * set up enough so that it can read an inode
3943 sb
->s_op
= &ext4_sops
;
3944 sb
->s_export_op
= &ext4_export_ops
;
3945 sb
->s_xattr
= ext4_xattr_handlers
;
3946 sb
->s_cop
= &ext4_cryptops
;
3948 sb
->dq_op
= &ext4_quota_operations
;
3949 if (ext4_has_feature_quota(sb
))
3950 sb
->s_qcop
= &dquot_quotactl_sysfile_ops
;
3952 sb
->s_qcop
= &ext4_qctl_operations
;
3953 sb
->s_quota_types
= QTYPE_MASK_USR
| QTYPE_MASK_GRP
| QTYPE_MASK_PRJ
;
3955 memcpy(&sb
->s_uuid
, es
->s_uuid
, sizeof(es
->s_uuid
));
3957 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
3958 mutex_init(&sbi
->s_orphan_lock
);
3962 needs_recovery
= (es
->s_last_orphan
!= 0 ||
3963 ext4_has_feature_journal_needs_recovery(sb
));
3965 if (ext4_has_feature_mmp(sb
) && !(sb
->s_flags
& MS_RDONLY
))
3966 if (ext4_multi_mount_protect(sb
, le64_to_cpu(es
->s_mmp_block
)))
3967 goto failed_mount3a
;
3970 * The first inode we look at is the journal inode. Don't try
3971 * root first: it may be modified in the journal!
3973 if (!test_opt(sb
, NOLOAD
) && ext4_has_feature_journal(sb
)) {
3974 err
= ext4_load_journal(sb
, es
, journal_devnum
);
3976 goto failed_mount3a
;
3977 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
3978 ext4_has_feature_journal_needs_recovery(sb
)) {
3979 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
3980 "suppressed and not mounted read-only");
3981 goto failed_mount_wq
;
3983 /* Nojournal mode, all journal mount options are illegal */
3984 if (test_opt2(sb
, EXPLICIT_JOURNAL_CHECKSUM
)) {
3985 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3986 "journal_checksum, fs mounted w/o journal");
3987 goto failed_mount_wq
;
3989 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
3990 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3991 "journal_async_commit, fs mounted w/o journal");
3992 goto failed_mount_wq
;
3994 if (sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
) {
3995 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3996 "commit=%lu, fs mounted w/o journal",
3997 sbi
->s_commit_interval
/ HZ
);
3998 goto failed_mount_wq
;
4000 if (EXT4_MOUNT_DATA_FLAGS
&
4001 (sbi
->s_mount_opt
^ sbi
->s_def_mount_opt
)) {
4002 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4003 "data=, fs mounted w/o journal");
4004 goto failed_mount_wq
;
4006 sbi
->s_def_mount_opt
&= EXT4_MOUNT_JOURNAL_CHECKSUM
;
4007 clear_opt(sb
, JOURNAL_CHECKSUM
);
4008 clear_opt(sb
, DATA_FLAGS
);
4009 sbi
->s_journal
= NULL
;
4014 if (ext4_has_feature_64bit(sb
) &&
4015 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
4016 JBD2_FEATURE_INCOMPAT_64BIT
)) {
4017 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
4018 goto failed_mount_wq
;
4021 if (!set_journal_csum_feature_set(sb
)) {
4022 ext4_msg(sb
, KERN_ERR
, "Failed to set journal checksum "
4024 goto failed_mount_wq
;
4027 /* We have now updated the journal if required, so we can
4028 * validate the data journaling mode. */
4029 switch (test_opt(sb
, DATA_FLAGS
)) {
4031 /* No mode set, assume a default based on the journal
4032 * capabilities: ORDERED_DATA if the journal can
4033 * cope, else JOURNAL_DATA
4035 if (jbd2_journal_check_available_features
4036 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
4037 set_opt(sb
, ORDERED_DATA
);
4039 set_opt(sb
, JOURNAL_DATA
);
4042 case EXT4_MOUNT_ORDERED_DATA
:
4043 case EXT4_MOUNT_WRITEBACK_DATA
:
4044 if (!jbd2_journal_check_available_features
4045 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
4046 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
4047 "requested data journaling mode");
4048 goto failed_mount_wq
;
4054 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
&&
4055 test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
4056 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4057 "journal_async_commit in data=ordered mode");
4058 goto failed_mount_wq
;
4061 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
4063 sbi
->s_journal
->j_commit_callback
= ext4_journal_commit_callback
;
4066 sbi
->s_mb_cache
= ext4_xattr_create_cache();
4067 if (!sbi
->s_mb_cache
) {
4068 ext4_msg(sb
, KERN_ERR
, "Failed to create an mb_cache");
4069 goto failed_mount_wq
;
4072 if ((DUMMY_ENCRYPTION_ENABLED(sbi
) || ext4_has_feature_encrypt(sb
)) &&
4073 (blocksize
!= PAGE_SIZE
)) {
4074 ext4_msg(sb
, KERN_ERR
,
4075 "Unsupported blocksize for fs encryption");
4076 goto failed_mount_wq
;
4079 if (DUMMY_ENCRYPTION_ENABLED(sbi
) && !(sb
->s_flags
& MS_RDONLY
) &&
4080 !ext4_has_feature_encrypt(sb
)) {
4081 ext4_set_feature_encrypt(sb
);
4082 ext4_commit_super(sb
, 1);
4086 * Get the # of file system overhead blocks from the
4087 * superblock if present.
4089 if (es
->s_overhead_clusters
)
4090 sbi
->s_overhead
= le32_to_cpu(es
->s_overhead_clusters
);
4092 err
= ext4_calculate_overhead(sb
);
4094 goto failed_mount_wq
;
4098 * The maximum number of concurrent works can be high and
4099 * concurrency isn't really necessary. Limit it to 1.
4101 EXT4_SB(sb
)->rsv_conversion_wq
=
4102 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM
| WQ_UNBOUND
, 1);
4103 if (!EXT4_SB(sb
)->rsv_conversion_wq
) {
4104 printk(KERN_ERR
"EXT4-fs: failed to create workqueue\n");
4110 * The jbd2_journal_load will have done any necessary log recovery,
4111 * so we can safely mount the rest of the filesystem now.
4114 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
4116 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
4117 ret
= PTR_ERR(root
);
4121 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
4122 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
4126 sb
->s_root
= d_make_root(root
);
4128 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
4133 if (ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
))
4134 sb
->s_flags
|= MS_RDONLY
;
4136 /* determine the minimum size of new large inodes, if present */
4137 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
&&
4138 sbi
->s_want_extra_isize
== 0) {
4139 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
4140 EXT4_GOOD_OLD_INODE_SIZE
;
4141 if (ext4_has_feature_extra_isize(sb
)) {
4142 if (sbi
->s_want_extra_isize
<
4143 le16_to_cpu(es
->s_want_extra_isize
))
4144 sbi
->s_want_extra_isize
=
4145 le16_to_cpu(es
->s_want_extra_isize
);
4146 if (sbi
->s_want_extra_isize
<
4147 le16_to_cpu(es
->s_min_extra_isize
))
4148 sbi
->s_want_extra_isize
=
4149 le16_to_cpu(es
->s_min_extra_isize
);
4152 /* Check if enough inode space is available */
4153 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
4154 sbi
->s_inode_size
) {
4155 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
4156 EXT4_GOOD_OLD_INODE_SIZE
;
4157 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
4161 ext4_set_resv_clusters(sb
);
4163 err
= ext4_setup_system_zone(sb
);
4165 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
4167 goto failed_mount4a
;
4171 err
= ext4_mb_init(sb
);
4173 ext4_msg(sb
, KERN_ERR
, "failed to initialize mballoc (%d)",
4178 block
= ext4_count_free_clusters(sb
);
4179 ext4_free_blocks_count_set(sbi
->s_es
,
4180 EXT4_C2B(sbi
, block
));
4181 err
= percpu_counter_init(&sbi
->s_freeclusters_counter
, block
,
4184 unsigned long freei
= ext4_count_free_inodes(sb
);
4185 sbi
->s_es
->s_free_inodes_count
= cpu_to_le32(freei
);
4186 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
, freei
,
4190 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
4191 ext4_count_dirs(sb
), GFP_KERNEL
);
4193 err
= percpu_counter_init(&sbi
->s_dirtyclusters_counter
, 0,
4196 err
= percpu_init_rwsem(&sbi
->s_journal_flag_rwsem
);
4199 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
4203 if (ext4_has_feature_flex_bg(sb
))
4204 if (!ext4_fill_flex_info(sb
)) {
4205 ext4_msg(sb
, KERN_ERR
,
4206 "unable to initialize "
4207 "flex_bg meta info!");
4211 err
= ext4_register_li_request(sb
, first_not_zeroed
);
4215 err
= ext4_register_sysfs(sb
);
4220 /* Enable quota usage during mount. */
4221 if (ext4_has_feature_quota(sb
) && !(sb
->s_flags
& MS_RDONLY
)) {
4222 err
= ext4_enable_quotas(sb
);
4226 #endif /* CONFIG_QUOTA */
4228 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
4229 ext4_orphan_cleanup(sb
, es
);
4230 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
4231 if (needs_recovery
) {
4232 ext4_msg(sb
, KERN_INFO
, "recovery complete");
4233 ext4_mark_recovery_complete(sb
, es
);
4235 if (EXT4_SB(sb
)->s_journal
) {
4236 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
4237 descr
= " journalled data mode";
4238 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
4239 descr
= " ordered data mode";
4241 descr
= " writeback data mode";
4243 descr
= "out journal";
4245 if (test_opt(sb
, DISCARD
)) {
4246 struct request_queue
*q
= bdev_get_queue(sb
->s_bdev
);
4247 if (!blk_queue_discard(q
))
4248 ext4_msg(sb
, KERN_WARNING
,
4249 "mounting with \"discard\" option, but "
4250 "the device does not support discard");
4253 if (___ratelimit(&ext4_mount_msg_ratelimit
, "EXT4-fs mount"))
4254 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s. "
4255 "Opts: %.*s%s%s", descr
,
4256 (int) sizeof(sbi
->s_es
->s_mount_opts
),
4257 sbi
->s_es
->s_mount_opts
,
4258 *sbi
->s_es
->s_mount_opts
? "; " : "", orig_data
);
4260 if (es
->s_error_count
)
4261 mod_timer(&sbi
->s_err_report
, jiffies
+ 300*HZ
); /* 5 minutes */
4263 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4264 ratelimit_state_init(&sbi
->s_err_ratelimit_state
, 5 * HZ
, 10);
4265 ratelimit_state_init(&sbi
->s_warning_ratelimit_state
, 5 * HZ
, 10);
4266 ratelimit_state_init(&sbi
->s_msg_ratelimit_state
, 5 * HZ
, 10);
4273 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
4278 ext4_unregister_sysfs(sb
);
4281 ext4_unregister_li_request(sb
);
4283 ext4_mb_release(sb
);
4284 if (sbi
->s_flex_groups
)
4285 kvfree(sbi
->s_flex_groups
);
4286 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
4287 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
4288 percpu_counter_destroy(&sbi
->s_dirs_counter
);
4289 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
4291 ext4_ext_release(sb
);
4292 ext4_release_system_zone(sb
);
4297 ext4_msg(sb
, KERN_ERR
, "mount failed");
4298 if (EXT4_SB(sb
)->rsv_conversion_wq
)
4299 destroy_workqueue(EXT4_SB(sb
)->rsv_conversion_wq
);
4301 if (sbi
->s_mb_cache
) {
4302 ext4_xattr_destroy_cache(sbi
->s_mb_cache
);
4303 sbi
->s_mb_cache
= NULL
;
4305 if (sbi
->s_journal
) {
4306 jbd2_journal_destroy(sbi
->s_journal
);
4307 sbi
->s_journal
= NULL
;
4310 ext4_es_unregister_shrinker(sbi
);
4312 del_timer_sync(&sbi
->s_err_report
);
4314 kthread_stop(sbi
->s_mmp_tsk
);
4316 for (i
= 0; i
< db_count
; i
++)
4317 brelse(sbi
->s_group_desc
[i
]);
4318 kvfree(sbi
->s_group_desc
);
4320 if (sbi
->s_chksum_driver
)
4321 crypto_free_shash(sbi
->s_chksum_driver
);
4323 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
4324 kfree(sbi
->s_qf_names
[i
]);
4326 ext4_blkdev_remove(sbi
);
4329 sb
->s_fs_info
= NULL
;
4330 kfree(sbi
->s_blockgroup_lock
);
4334 return err
? err
: ret
;
4338 * Setup any per-fs journal parameters now. We'll do this both on
4339 * initial mount, once the journal has been initialised but before we've
4340 * done any recovery; and again on any subsequent remount.
4342 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
4344 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4346 journal
->j_commit_interval
= sbi
->s_commit_interval
;
4347 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
4348 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
4350 write_lock(&journal
->j_state_lock
);
4351 if (test_opt(sb
, BARRIER
))
4352 journal
->j_flags
|= JBD2_BARRIER
;
4354 journal
->j_flags
&= ~JBD2_BARRIER
;
4355 if (test_opt(sb
, DATA_ERR_ABORT
))
4356 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
4358 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
4359 write_unlock(&journal
->j_state_lock
);
4362 static struct inode
*ext4_get_journal_inode(struct super_block
*sb
,
4363 unsigned int journal_inum
)
4365 struct inode
*journal_inode
;
4368 * Test for the existence of a valid inode on disk. Bad things
4369 * happen if we iget() an unused inode, as the subsequent iput()
4370 * will try to delete it.
4372 journal_inode
= ext4_iget(sb
, journal_inum
);
4373 if (IS_ERR(journal_inode
)) {
4374 ext4_msg(sb
, KERN_ERR
, "no journal found");
4377 if (!journal_inode
->i_nlink
) {
4378 make_bad_inode(journal_inode
);
4379 iput(journal_inode
);
4380 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
4384 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4385 journal_inode
, journal_inode
->i_size
);
4386 if (!S_ISREG(journal_inode
->i_mode
)) {
4387 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
4388 iput(journal_inode
);
4391 return journal_inode
;
4394 static journal_t
*ext4_get_journal(struct super_block
*sb
,
4395 unsigned int journal_inum
)
4397 struct inode
*journal_inode
;
4400 BUG_ON(!ext4_has_feature_journal(sb
));
4402 journal_inode
= ext4_get_journal_inode(sb
, journal_inum
);
4406 journal
= jbd2_journal_init_inode(journal_inode
);
4408 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
4409 iput(journal_inode
);
4412 journal
->j_private
= sb
;
4413 ext4_init_journal_params(sb
, journal
);
4417 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
4420 struct buffer_head
*bh
;
4424 int hblock
, blocksize
;
4425 ext4_fsblk_t sb_block
;
4426 unsigned long offset
;
4427 struct ext4_super_block
*es
;
4428 struct block_device
*bdev
;
4430 BUG_ON(!ext4_has_feature_journal(sb
));
4432 bdev
= ext4_blkdev_get(j_dev
, sb
);
4436 blocksize
= sb
->s_blocksize
;
4437 hblock
= bdev_logical_block_size(bdev
);
4438 if (blocksize
< hblock
) {
4439 ext4_msg(sb
, KERN_ERR
,
4440 "blocksize too small for journal device");
4444 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
4445 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
4446 set_blocksize(bdev
, blocksize
);
4447 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
4448 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
4449 "external journal");
4453 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
4454 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
4455 !(le32_to_cpu(es
->s_feature_incompat
) &
4456 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
4457 ext4_msg(sb
, KERN_ERR
, "external journal has "
4463 if ((le32_to_cpu(es
->s_feature_ro_compat
) &
4464 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
) &&
4465 es
->s_checksum
!= ext4_superblock_csum(sb
, es
)) {
4466 ext4_msg(sb
, KERN_ERR
, "external journal has "
4467 "corrupt superblock");
4472 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
4473 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
4478 len
= ext4_blocks_count(es
);
4479 start
= sb_block
+ 1;
4480 brelse(bh
); /* we're done with the superblock */
4482 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
4483 start
, len
, blocksize
);
4485 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
4488 journal
->j_private
= sb
;
4489 ll_rw_block(REQ_OP_READ
, REQ_META
| REQ_PRIO
, 1, &journal
->j_sb_buffer
);
4490 wait_on_buffer(journal
->j_sb_buffer
);
4491 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
4492 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
4495 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
4496 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
4497 "user (unsupported) - %d",
4498 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
4501 EXT4_SB(sb
)->journal_bdev
= bdev
;
4502 ext4_init_journal_params(sb
, journal
);
4506 jbd2_journal_destroy(journal
);
4508 ext4_blkdev_put(bdev
);
4512 static int ext4_load_journal(struct super_block
*sb
,
4513 struct ext4_super_block
*es
,
4514 unsigned long journal_devnum
)
4517 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
4520 int really_read_only
;
4522 BUG_ON(!ext4_has_feature_journal(sb
));
4524 if (journal_devnum
&&
4525 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4526 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
4527 "numbers have changed");
4528 journal_dev
= new_decode_dev(journal_devnum
);
4530 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
4532 really_read_only
= bdev_read_only(sb
->s_bdev
);
4535 * Are we loading a blank journal or performing recovery after a
4536 * crash? For recovery, we need to check in advance whether we
4537 * can get read-write access to the device.
4539 if (ext4_has_feature_journal_needs_recovery(sb
)) {
4540 if (sb
->s_flags
& MS_RDONLY
) {
4541 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
4542 "required on readonly filesystem");
4543 if (really_read_only
) {
4544 ext4_msg(sb
, KERN_ERR
, "write access "
4545 "unavailable, cannot proceed");
4548 ext4_msg(sb
, KERN_INFO
, "write access will "
4549 "be enabled during recovery");
4553 if (journal_inum
&& journal_dev
) {
4554 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
4555 "and inode journals!");
4560 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
4563 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
4567 if (!(journal
->j_flags
& JBD2_BARRIER
))
4568 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
4570 if (!ext4_has_feature_journal_needs_recovery(sb
))
4571 err
= jbd2_journal_wipe(journal
, !really_read_only
);
4573 char *save
= kmalloc(EXT4_S_ERR_LEN
, GFP_KERNEL
);
4575 memcpy(save
, ((char *) es
) +
4576 EXT4_S_ERR_START
, EXT4_S_ERR_LEN
);
4577 err
= jbd2_journal_load(journal
);
4579 memcpy(((char *) es
) + EXT4_S_ERR_START
,
4580 save
, EXT4_S_ERR_LEN
);
4585 ext4_msg(sb
, KERN_ERR
, "error loading journal");
4586 jbd2_journal_destroy(journal
);
4590 EXT4_SB(sb
)->s_journal
= journal
;
4591 ext4_clear_journal_err(sb
, es
);
4593 if (!really_read_only
&& journal_devnum
&&
4594 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4595 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
4597 /* Make sure we flush the recovery flag to disk. */
4598 ext4_commit_super(sb
, 1);
4604 static int ext4_commit_super(struct super_block
*sb
, int sync
)
4606 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
4607 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
4610 if (!sbh
|| block_device_ejected(sb
))
4613 * If the file system is mounted read-only, don't update the
4614 * superblock write time. This avoids updating the superblock
4615 * write time when we are mounting the root file system
4616 * read/only but we need to replay the journal; at that point,
4617 * for people who are east of GMT and who make their clock
4618 * tick in localtime for Windows bug-for-bug compatibility,
4619 * the clock is set in the future, and this will cause e2fsck
4620 * to complain and force a full file system check.
4622 if (!(sb
->s_flags
& MS_RDONLY
))
4623 es
->s_wtime
= cpu_to_le32(get_seconds());
4624 if (sb
->s_bdev
->bd_part
)
4625 es
->s_kbytes_written
=
4626 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
4627 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
4628 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
4630 es
->s_kbytes_written
=
4631 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
);
4632 if (percpu_counter_initialized(&EXT4_SB(sb
)->s_freeclusters_counter
))
4633 ext4_free_blocks_count_set(es
,
4634 EXT4_C2B(EXT4_SB(sb
), percpu_counter_sum_positive(
4635 &EXT4_SB(sb
)->s_freeclusters_counter
)));
4636 if (percpu_counter_initialized(&EXT4_SB(sb
)->s_freeinodes_counter
))
4637 es
->s_free_inodes_count
=
4638 cpu_to_le32(percpu_counter_sum_positive(
4639 &EXT4_SB(sb
)->s_freeinodes_counter
));
4640 BUFFER_TRACE(sbh
, "marking dirty");
4641 ext4_superblock_csum_set(sb
);
4644 if (buffer_write_io_error(sbh
)) {
4646 * Oh, dear. A previous attempt to write the
4647 * superblock failed. This could happen because the
4648 * USB device was yanked out. Or it could happen to
4649 * be a transient write error and maybe the block will
4650 * be remapped. Nothing we can do but to retry the
4651 * write and hope for the best.
4653 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
4654 "superblock detected");
4655 clear_buffer_write_io_error(sbh
);
4656 set_buffer_uptodate(sbh
);
4658 mark_buffer_dirty(sbh
);
4661 error
= __sync_dirty_buffer(sbh
,
4662 REQ_SYNC
| (test_opt(sb
, BARRIER
) ? REQ_FUA
: 0));
4666 error
= buffer_write_io_error(sbh
);
4668 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
4670 clear_buffer_write_io_error(sbh
);
4671 set_buffer_uptodate(sbh
);
4678 * Have we just finished recovery? If so, and if we are mounting (or
4679 * remounting) the filesystem readonly, then we will end up with a
4680 * consistent fs on disk. Record that fact.
4682 static void ext4_mark_recovery_complete(struct super_block
*sb
,
4683 struct ext4_super_block
*es
)
4685 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
4687 if (!ext4_has_feature_journal(sb
)) {
4688 BUG_ON(journal
!= NULL
);
4691 jbd2_journal_lock_updates(journal
);
4692 if (jbd2_journal_flush(journal
) < 0)
4695 if (ext4_has_feature_journal_needs_recovery(sb
) &&
4696 sb
->s_flags
& MS_RDONLY
) {
4697 ext4_clear_feature_journal_needs_recovery(sb
);
4698 ext4_commit_super(sb
, 1);
4702 jbd2_journal_unlock_updates(journal
);
4706 * If we are mounting (or read-write remounting) a filesystem whose journal
4707 * has recorded an error from a previous lifetime, move that error to the
4708 * main filesystem now.
4710 static void ext4_clear_journal_err(struct super_block
*sb
,
4711 struct ext4_super_block
*es
)
4717 BUG_ON(!ext4_has_feature_journal(sb
));
4719 journal
= EXT4_SB(sb
)->s_journal
;
4722 * Now check for any error status which may have been recorded in the
4723 * journal by a prior ext4_error() or ext4_abort()
4726 j_errno
= jbd2_journal_errno(journal
);
4730 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
4731 ext4_warning(sb
, "Filesystem error recorded "
4732 "from previous mount: %s", errstr
);
4733 ext4_warning(sb
, "Marking fs in need of filesystem check.");
4735 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
4736 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
4737 ext4_commit_super(sb
, 1);
4739 jbd2_journal_clear_err(journal
);
4740 jbd2_journal_update_sb_errno(journal
);
4745 * Force the running and committing transactions to commit,
4746 * and wait on the commit.
4748 int ext4_force_commit(struct super_block
*sb
)
4752 if (sb
->s_flags
& MS_RDONLY
)
4755 journal
= EXT4_SB(sb
)->s_journal
;
4756 return ext4_journal_force_commit(journal
);
4759 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
4763 bool needs_barrier
= false;
4764 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4766 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
4769 trace_ext4_sync_fs(sb
, wait
);
4770 flush_workqueue(sbi
->rsv_conversion_wq
);
4772 * Writeback quota in non-journalled quota case - journalled quota has
4775 dquot_writeback_dquots(sb
, -1);
4777 * Data writeback is possible w/o journal transaction, so barrier must
4778 * being sent at the end of the function. But we can skip it if
4779 * transaction_commit will do it for us.
4781 if (sbi
->s_journal
) {
4782 target
= jbd2_get_latest_transaction(sbi
->s_journal
);
4783 if (wait
&& sbi
->s_journal
->j_flags
& JBD2_BARRIER
&&
4784 !jbd2_trans_will_send_data_barrier(sbi
->s_journal
, target
))
4785 needs_barrier
= true;
4787 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
4789 ret
= jbd2_log_wait_commit(sbi
->s_journal
,
4792 } else if (wait
&& test_opt(sb
, BARRIER
))
4793 needs_barrier
= true;
4794 if (needs_barrier
) {
4796 err
= blkdev_issue_flush(sb
->s_bdev
, GFP_KERNEL
, NULL
);
4805 * LVM calls this function before a (read-only) snapshot is created. This
4806 * gives us a chance to flush the journal completely and mark the fs clean.
4808 * Note that only this function cannot bring a filesystem to be in a clean
4809 * state independently. It relies on upper layer to stop all data & metadata
4812 static int ext4_freeze(struct super_block
*sb
)
4817 if (sb
->s_flags
& MS_RDONLY
)
4820 journal
= EXT4_SB(sb
)->s_journal
;
4823 /* Now we set up the journal barrier. */
4824 jbd2_journal_lock_updates(journal
);
4827 * Don't clear the needs_recovery flag if we failed to
4828 * flush the journal.
4830 error
= jbd2_journal_flush(journal
);
4834 /* Journal blocked and flushed, clear needs_recovery flag. */
4835 ext4_clear_feature_journal_needs_recovery(sb
);
4838 error
= ext4_commit_super(sb
, 1);
4841 /* we rely on upper layer to stop further updates */
4842 jbd2_journal_unlock_updates(journal
);
4847 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4848 * flag here, even though the filesystem is not technically dirty yet.
4850 static int ext4_unfreeze(struct super_block
*sb
)
4852 if ((sb
->s_flags
& MS_RDONLY
) || ext4_forced_shutdown(EXT4_SB(sb
)))
4855 if (EXT4_SB(sb
)->s_journal
) {
4856 /* Reset the needs_recovery flag before the fs is unlocked. */
4857 ext4_set_feature_journal_needs_recovery(sb
);
4860 ext4_commit_super(sb
, 1);
4865 * Structure to save mount options for ext4_remount's benefit
4867 struct ext4_mount_options
{
4868 unsigned long s_mount_opt
;
4869 unsigned long s_mount_opt2
;
4872 unsigned long s_commit_interval
;
4873 u32 s_min_batch_time
, s_max_batch_time
;
4876 char *s_qf_names
[EXT4_MAXQUOTAS
];
4880 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
4882 struct ext4_super_block
*es
;
4883 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4884 unsigned long old_sb_flags
;
4885 struct ext4_mount_options old_opts
;
4886 int enable_quota
= 0;
4888 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
4893 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
4895 /* Store the original options */
4896 old_sb_flags
= sb
->s_flags
;
4897 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
4898 old_opts
.s_mount_opt2
= sbi
->s_mount_opt2
;
4899 old_opts
.s_resuid
= sbi
->s_resuid
;
4900 old_opts
.s_resgid
= sbi
->s_resgid
;
4901 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
4902 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
4903 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
4905 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
4906 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
4907 if (sbi
->s_qf_names
[i
]) {
4908 old_opts
.s_qf_names
[i
] = kstrdup(sbi
->s_qf_names
[i
],
4910 if (!old_opts
.s_qf_names
[i
]) {
4911 for (j
= 0; j
< i
; j
++)
4912 kfree(old_opts
.s_qf_names
[j
]);
4917 old_opts
.s_qf_names
[i
] = NULL
;
4919 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
4920 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
4922 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
, 1)) {
4927 if ((old_opts
.s_mount_opt
& EXT4_MOUNT_JOURNAL_CHECKSUM
) ^
4928 test_opt(sb
, JOURNAL_CHECKSUM
)) {
4929 ext4_msg(sb
, KERN_ERR
, "changing journal_checksum "
4930 "during remount not supported; ignoring");
4931 sbi
->s_mount_opt
^= EXT4_MOUNT_JOURNAL_CHECKSUM
;
4934 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
4935 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
4936 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4937 "both data=journal and delalloc");
4941 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
4942 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4943 "both data=journal and dioread_nolock");
4947 if (test_opt(sb
, DAX
)) {
4948 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4949 "both data=journal and dax");
4953 } else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
) {
4954 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
4955 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4956 "journal_async_commit in data=ordered mode");
4962 if ((sbi
->s_mount_opt
^ old_opts
.s_mount_opt
) & EXT4_MOUNT_DAX
) {
4963 ext4_msg(sb
, KERN_WARNING
, "warning: refusing change of "
4964 "dax flag with busy inodes while remounting");
4965 sbi
->s_mount_opt
^= EXT4_MOUNT_DAX
;
4968 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
4969 ext4_abort(sb
, "Abort forced by user");
4971 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
4972 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
4976 if (sbi
->s_journal
) {
4977 ext4_init_journal_params(sb
, sbi
->s_journal
);
4978 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
4981 if (*flags
& MS_LAZYTIME
)
4982 sb
->s_flags
|= MS_LAZYTIME
;
4984 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
)) {
4985 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
4990 if (*flags
& MS_RDONLY
) {
4991 err
= sync_filesystem(sb
);
4994 err
= dquot_suspend(sb
, -1);
4999 * First of all, the unconditional stuff we have to do
5000 * to disable replay of the journal when we next remount
5002 sb
->s_flags
|= MS_RDONLY
;
5005 * OK, test if we are remounting a valid rw partition
5006 * readonly, and if so set the rdonly flag and then
5007 * mark the partition as valid again.
5009 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
5010 (sbi
->s_mount_state
& EXT4_VALID_FS
))
5011 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
5014 ext4_mark_recovery_complete(sb
, es
);
5016 /* Make sure we can mount this feature set readwrite */
5017 if (ext4_has_feature_readonly(sb
) ||
5018 !ext4_feature_set_ok(sb
, 0)) {
5023 * Make sure the group descriptor checksums
5024 * are sane. If they aren't, refuse to remount r/w.
5026 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
5027 struct ext4_group_desc
*gdp
=
5028 ext4_get_group_desc(sb
, g
, NULL
);
5030 if (!ext4_group_desc_csum_verify(sb
, g
, gdp
)) {
5031 ext4_msg(sb
, KERN_ERR
,
5032 "ext4_remount: Checksum for group %u failed (%u!=%u)",
5033 g
, le16_to_cpu(ext4_group_desc_csum(sb
, g
, gdp
)),
5034 le16_to_cpu(gdp
->bg_checksum
));
5041 * If we have an unprocessed orphan list hanging
5042 * around from a previously readonly bdev mount,
5043 * require a full umount/remount for now.
5045 if (es
->s_last_orphan
) {
5046 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
5047 "remount RDWR because of unprocessed "
5048 "orphan inode list. Please "
5049 "umount/remount instead");
5055 * Mounting a RDONLY partition read-write, so reread
5056 * and store the current valid flag. (It may have
5057 * been changed by e2fsck since we originally mounted
5061 ext4_clear_journal_err(sb
, es
);
5062 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
5063 if (!ext4_setup_super(sb
, es
, 0))
5064 sb
->s_flags
&= ~MS_RDONLY
;
5065 if (ext4_has_feature_mmp(sb
))
5066 if (ext4_multi_mount_protect(sb
,
5067 le64_to_cpu(es
->s_mmp_block
))) {
5076 * Reinitialize lazy itable initialization thread based on
5079 if ((sb
->s_flags
& MS_RDONLY
) || !test_opt(sb
, INIT_INODE_TABLE
))
5080 ext4_unregister_li_request(sb
);
5082 ext4_group_t first_not_zeroed
;
5083 first_not_zeroed
= ext4_has_uninit_itable(sb
);
5084 ext4_register_li_request(sb
, first_not_zeroed
);
5087 ext4_setup_system_zone(sb
);
5088 if (sbi
->s_journal
== NULL
&& !(old_sb_flags
& MS_RDONLY
))
5089 ext4_commit_super(sb
, 1);
5092 /* Release old quota file names */
5093 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
5094 kfree(old_opts
.s_qf_names
[i
]);
5096 if (sb_any_quota_suspended(sb
))
5097 dquot_resume(sb
, -1);
5098 else if (ext4_has_feature_quota(sb
)) {
5099 err
= ext4_enable_quotas(sb
);
5106 *flags
= (*flags
& ~MS_LAZYTIME
) | (sb
->s_flags
& MS_LAZYTIME
);
5107 ext4_msg(sb
, KERN_INFO
, "re-mounted. Opts: %s", orig_data
);
5112 sb
->s_flags
= old_sb_flags
;
5113 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
5114 sbi
->s_mount_opt2
= old_opts
.s_mount_opt2
;
5115 sbi
->s_resuid
= old_opts
.s_resuid
;
5116 sbi
->s_resgid
= old_opts
.s_resgid
;
5117 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
5118 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
5119 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
5121 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
5122 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++) {
5123 kfree(sbi
->s_qf_names
[i
]);
5124 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
5132 static int ext4_statfs_project(struct super_block
*sb
,
5133 kprojid_t projid
, struct kstatfs
*buf
)
5136 struct dquot
*dquot
;
5140 qid
= make_kqid_projid(projid
);
5141 dquot
= dqget(sb
, qid
);
5143 return PTR_ERR(dquot
);
5144 spin_lock(&dq_data_lock
);
5146 limit
= (dquot
->dq_dqb
.dqb_bsoftlimit
?
5147 dquot
->dq_dqb
.dqb_bsoftlimit
:
5148 dquot
->dq_dqb
.dqb_bhardlimit
) >> sb
->s_blocksize_bits
;
5149 if (limit
&& buf
->f_blocks
> limit
) {
5150 curblock
= dquot
->dq_dqb
.dqb_curspace
>> sb
->s_blocksize_bits
;
5151 buf
->f_blocks
= limit
;
5152 buf
->f_bfree
= buf
->f_bavail
=
5153 (buf
->f_blocks
> curblock
) ?
5154 (buf
->f_blocks
- curblock
) : 0;
5157 limit
= dquot
->dq_dqb
.dqb_isoftlimit
?
5158 dquot
->dq_dqb
.dqb_isoftlimit
:
5159 dquot
->dq_dqb
.dqb_ihardlimit
;
5160 if (limit
&& buf
->f_files
> limit
) {
5161 buf
->f_files
= limit
;
5163 (buf
->f_files
> dquot
->dq_dqb
.dqb_curinodes
) ?
5164 (buf
->f_files
- dquot
->dq_dqb
.dqb_curinodes
) : 0;
5167 spin_unlock(&dq_data_lock
);
5173 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
5175 struct super_block
*sb
= dentry
->d_sb
;
5176 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
5177 struct ext4_super_block
*es
= sbi
->s_es
;
5178 ext4_fsblk_t overhead
= 0, resv_blocks
;
5181 resv_blocks
= EXT4_C2B(sbi
, atomic64_read(&sbi
->s_resv_clusters
));
5183 if (!test_opt(sb
, MINIX_DF
))
5184 overhead
= sbi
->s_overhead
;
5186 buf
->f_type
= EXT4_SUPER_MAGIC
;
5187 buf
->f_bsize
= sb
->s_blocksize
;
5188 buf
->f_blocks
= ext4_blocks_count(es
) - EXT4_C2B(sbi
, overhead
);
5189 bfree
= percpu_counter_sum_positive(&sbi
->s_freeclusters_counter
) -
5190 percpu_counter_sum_positive(&sbi
->s_dirtyclusters_counter
);
5191 /* prevent underflow in case that few free space is available */
5192 buf
->f_bfree
= EXT4_C2B(sbi
, max_t(s64
, bfree
, 0));
5193 buf
->f_bavail
= buf
->f_bfree
-
5194 (ext4_r_blocks_count(es
) + resv_blocks
);
5195 if (buf
->f_bfree
< (ext4_r_blocks_count(es
) + resv_blocks
))
5197 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
5198 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
5199 buf
->f_namelen
= EXT4_NAME_LEN
;
5200 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
5201 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
5202 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
5203 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
5206 if (ext4_test_inode_flag(dentry
->d_inode
, EXT4_INODE_PROJINHERIT
) &&
5207 sb_has_quota_limits_enabled(sb
, PRJQUOTA
))
5208 ext4_statfs_project(sb
, EXT4_I(dentry
->d_inode
)->i_projid
, buf
);
5213 /* Helper function for writing quotas on sync - we need to start transaction
5214 * before quota file is locked for write. Otherwise the are possible deadlocks:
5215 * Process 1 Process 2
5216 * ext4_create() quota_sync()
5217 * jbd2_journal_start() write_dquot()
5218 * dquot_initialize() down(dqio_mutex)
5219 * down(dqio_mutex) jbd2_journal_start()
5225 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
5227 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_id
.type
];
5230 static int ext4_write_dquot(struct dquot
*dquot
)
5234 struct inode
*inode
;
5236 inode
= dquot_to_inode(dquot
);
5237 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
,
5238 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
5240 return PTR_ERR(handle
);
5241 ret
= dquot_commit(dquot
);
5242 err
= ext4_journal_stop(handle
);
5248 static int ext4_acquire_dquot(struct dquot
*dquot
)
5253 handle
= ext4_journal_start(dquot_to_inode(dquot
), EXT4_HT_QUOTA
,
5254 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
5256 return PTR_ERR(handle
);
5257 ret
= dquot_acquire(dquot
);
5258 err
= ext4_journal_stop(handle
);
5264 static int ext4_release_dquot(struct dquot
*dquot
)
5269 handle
= ext4_journal_start(dquot_to_inode(dquot
), EXT4_HT_QUOTA
,
5270 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
5271 if (IS_ERR(handle
)) {
5272 /* Release dquot anyway to avoid endless cycle in dqput() */
5273 dquot_release(dquot
);
5274 return PTR_ERR(handle
);
5276 ret
= dquot_release(dquot
);
5277 err
= ext4_journal_stop(handle
);
5283 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
5285 struct super_block
*sb
= dquot
->dq_sb
;
5286 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
5288 /* Are we journaling quotas? */
5289 if (ext4_has_feature_quota(sb
) ||
5290 sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
5291 dquot_mark_dquot_dirty(dquot
);
5292 return ext4_write_dquot(dquot
);
5294 return dquot_mark_dquot_dirty(dquot
);
5298 static int ext4_write_info(struct super_block
*sb
, int type
)
5303 /* Data block + inode block */
5304 handle
= ext4_journal_start(d_inode(sb
->s_root
), EXT4_HT_QUOTA
, 2);
5306 return PTR_ERR(handle
);
5307 ret
= dquot_commit_info(sb
, type
);
5308 err
= ext4_journal_stop(handle
);
5315 * Turn on quotas during mount time - we need to find
5316 * the quota file and such...
5318 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
5320 return dquot_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
5321 EXT4_SB(sb
)->s_jquota_fmt
, type
);
5324 static void lockdep_set_quota_inode(struct inode
*inode
, int subclass
)
5326 struct ext4_inode_info
*ei
= EXT4_I(inode
);
5328 /* The first argument of lockdep_set_subclass has to be
5329 * *exactly* the same as the argument to init_rwsem() --- in
5330 * this case, in init_once() --- or lockdep gets unhappy
5331 * because the name of the lock is set using the
5332 * stringification of the argument to init_rwsem().
5334 (void) ei
; /* shut up clang warning if !CONFIG_LOCKDEP */
5335 lockdep_set_subclass(&ei
->i_data_sem
, subclass
);
5339 * Standard function to be called on quota_on
5341 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
5342 const struct path
*path
)
5346 if (!test_opt(sb
, QUOTA
))
5349 /* Quotafile not on the same filesystem? */
5350 if (path
->dentry
->d_sb
!= sb
)
5352 /* Journaling quota? */
5353 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
5354 /* Quotafile not in fs root? */
5355 if (path
->dentry
->d_parent
!= sb
->s_root
)
5356 ext4_msg(sb
, KERN_WARNING
,
5357 "Quota file not on filesystem root. "
5358 "Journaled quota will not work");
5362 * When we journal data on quota file, we have to flush journal to see
5363 * all updates to the file when we bypass pagecache...
5365 if (EXT4_SB(sb
)->s_journal
&&
5366 ext4_should_journal_data(d_inode(path
->dentry
))) {
5368 * We don't need to lock updates but journal_flush() could
5369 * otherwise be livelocked...
5371 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
5372 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
5373 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
5378 lockdep_set_quota_inode(path
->dentry
->d_inode
, I_DATA_SEM_QUOTA
);
5379 err
= dquot_quota_on(sb
, type
, format_id
, path
);
5381 lockdep_set_quota_inode(path
->dentry
->d_inode
,
5384 struct inode
*inode
= d_inode(path
->dentry
);
5388 * Set inode flags to prevent userspace from messing with quota
5389 * files. If this fails, we return success anyway since quotas
5390 * are already enabled and this is not a hard failure.
5393 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
, 1);
5396 EXT4_I(inode
)->i_flags
|= EXT4_NOATIME_FL
| EXT4_IMMUTABLE_FL
;
5397 inode_set_flags(inode
, S_NOATIME
| S_IMMUTABLE
,
5398 S_NOATIME
| S_IMMUTABLE
);
5399 ext4_mark_inode_dirty(handle
, inode
);
5400 ext4_journal_stop(handle
);
5402 inode_unlock(inode
);
5407 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
5411 struct inode
*qf_inode
;
5412 unsigned long qf_inums
[EXT4_MAXQUOTAS
] = {
5413 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
5414 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
),
5415 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_prj_quota_inum
)
5418 BUG_ON(!ext4_has_feature_quota(sb
));
5420 if (!qf_inums
[type
])
5423 qf_inode
= ext4_iget(sb
, qf_inums
[type
]);
5424 if (IS_ERR(qf_inode
)) {
5425 ext4_error(sb
, "Bad quota inode # %lu", qf_inums
[type
]);
5426 return PTR_ERR(qf_inode
);
5429 /* Don't account quota for quota files to avoid recursion */
5430 qf_inode
->i_flags
|= S_NOQUOTA
;
5431 lockdep_set_quota_inode(qf_inode
, I_DATA_SEM_QUOTA
);
5432 err
= dquot_enable(qf_inode
, type
, format_id
, flags
);
5435 lockdep_set_quota_inode(qf_inode
, I_DATA_SEM_NORMAL
);
5440 /* Enable usage tracking for all quota types. */
5441 static int ext4_enable_quotas(struct super_block
*sb
)
5444 unsigned long qf_inums
[EXT4_MAXQUOTAS
] = {
5445 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
5446 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
),
5447 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_prj_quota_inum
)
5449 bool quota_mopt
[EXT4_MAXQUOTAS
] = {
5450 test_opt(sb
, USRQUOTA
),
5451 test_opt(sb
, GRPQUOTA
),
5452 test_opt(sb
, PRJQUOTA
),
5455 sb_dqopt(sb
)->flags
|= DQUOT_QUOTA_SYS_FILE
;
5456 for (type
= 0; type
< EXT4_MAXQUOTAS
; type
++) {
5457 if (qf_inums
[type
]) {
5458 err
= ext4_quota_enable(sb
, type
, QFMT_VFS_V1
,
5459 DQUOT_USAGE_ENABLED
|
5460 (quota_mopt
[type
] ? DQUOT_LIMITS_ENABLED
: 0));
5463 "Failed to enable quota tracking "
5464 "(type=%d, err=%d). Please run "
5465 "e2fsck to fix.", type
, err
);
5473 static int ext4_quota_off(struct super_block
*sb
, int type
)
5475 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5479 /* Force all delayed allocation blocks to be allocated.
5480 * Caller already holds s_umount sem */
5481 if (test_opt(sb
, DELALLOC
))
5482 sync_filesystem(sb
);
5484 if (!inode
|| !igrab(inode
))
5487 err
= dquot_quota_off(sb
, type
);
5493 * Update modification times of quota files when userspace can
5494 * start looking at them. If we fail, we return success anyway since
5495 * this is not a hard failure and quotas are already disabled.
5497 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
, 1);
5500 EXT4_I(inode
)->i_flags
&= ~(EXT4_NOATIME_FL
| EXT4_IMMUTABLE_FL
);
5501 inode_set_flags(inode
, 0, S_NOATIME
| S_IMMUTABLE
);
5502 inode
->i_mtime
= inode
->i_ctime
= current_time(inode
);
5503 ext4_mark_inode_dirty(handle
, inode
);
5504 ext4_journal_stop(handle
);
5506 inode_unlock(inode
);
5511 return dquot_quota_off(sb
, type
);
5514 /* Read data from quotafile - avoid pagecache and such because we cannot afford
5515 * acquiring the locks... As quota files are never truncated and quota code
5516 * itself serializes the operations (and no one else should touch the files)
5517 * we don't have to be afraid of races */
5518 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
5519 size_t len
, loff_t off
)
5521 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5522 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5523 int offset
= off
& (sb
->s_blocksize
- 1);
5526 struct buffer_head
*bh
;
5527 loff_t i_size
= i_size_read(inode
);
5531 if (off
+len
> i_size
)
5534 while (toread
> 0) {
5535 tocopy
= sb
->s_blocksize
- offset
< toread
?
5536 sb
->s_blocksize
- offset
: toread
;
5537 bh
= ext4_bread(NULL
, inode
, blk
, 0);
5540 if (!bh
) /* A hole? */
5541 memset(data
, 0, tocopy
);
5543 memcpy(data
, bh
->b_data
+offset
, tocopy
);
5553 /* Write to quotafile (we know the transaction is already started and has
5554 * enough credits) */
5555 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
5556 const char *data
, size_t len
, loff_t off
)
5558 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5559 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5560 int err
, offset
= off
& (sb
->s_blocksize
- 1);
5562 struct buffer_head
*bh
;
5563 handle_t
*handle
= journal_current_handle();
5565 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
5566 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5567 " cancelled because transaction is not started",
5568 (unsigned long long)off
, (unsigned long long)len
);
5572 * Since we account only one data block in transaction credits,
5573 * then it is impossible to cross a block boundary.
5575 if (sb
->s_blocksize
- offset
< len
) {
5576 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5577 " cancelled because not block aligned",
5578 (unsigned long long)off
, (unsigned long long)len
);
5583 bh
= ext4_bread(handle
, inode
, blk
,
5584 EXT4_GET_BLOCKS_CREATE
|
5585 EXT4_GET_BLOCKS_METADATA_NOFAIL
);
5586 } while (IS_ERR(bh
) && (PTR_ERR(bh
) == -ENOSPC
) &&
5587 ext4_should_retry_alloc(inode
->i_sb
, &retries
));
5592 BUFFER_TRACE(bh
, "get write access");
5593 err
= ext4_journal_get_write_access(handle
, bh
);
5599 memcpy(bh
->b_data
+offset
, data
, len
);
5600 flush_dcache_page(bh
->b_page
);
5602 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
5605 if (inode
->i_size
< off
+ len
) {
5606 i_size_write(inode
, off
+ len
);
5607 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
5608 ext4_mark_inode_dirty(handle
, inode
);
5613 static int ext4_get_next_id(struct super_block
*sb
, struct kqid
*qid
)
5615 const struct quota_format_ops
*ops
;
5617 if (!sb_has_quota_loaded(sb
, qid
->type
))
5619 ops
= sb_dqopt(sb
)->ops
[qid
->type
];
5620 if (!ops
|| !ops
->get_next_id
)
5622 return dquot_get_next_id(sb
, qid
);
5626 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
5627 const char *dev_name
, void *data
)
5629 return mount_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
);
5632 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
5633 static inline void register_as_ext2(void)
5635 int err
= register_filesystem(&ext2_fs_type
);
5638 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
5641 static inline void unregister_as_ext2(void)
5643 unregister_filesystem(&ext2_fs_type
);
5646 static inline int ext2_feature_set_ok(struct super_block
*sb
)
5648 if (ext4_has_unknown_ext2_incompat_features(sb
))
5650 if (sb
->s_flags
& MS_RDONLY
)
5652 if (ext4_has_unknown_ext2_ro_compat_features(sb
))
5657 static inline void register_as_ext2(void) { }
5658 static inline void unregister_as_ext2(void) { }
5659 static inline int ext2_feature_set_ok(struct super_block
*sb
) { return 0; }
5662 static inline void register_as_ext3(void)
5664 int err
= register_filesystem(&ext3_fs_type
);
5667 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
5670 static inline void unregister_as_ext3(void)
5672 unregister_filesystem(&ext3_fs_type
);
5675 static inline int ext3_feature_set_ok(struct super_block
*sb
)
5677 if (ext4_has_unknown_ext3_incompat_features(sb
))
5679 if (!ext4_has_feature_journal(sb
))
5681 if (sb
->s_flags
& MS_RDONLY
)
5683 if (ext4_has_unknown_ext3_ro_compat_features(sb
))
5688 static struct file_system_type ext4_fs_type
= {
5689 .owner
= THIS_MODULE
,
5691 .mount
= ext4_mount
,
5692 .kill_sb
= kill_block_super
,
5693 .fs_flags
= FS_REQUIRES_DEV
,
5695 MODULE_ALIAS_FS("ext4");
5697 /* Shared across all ext4 file systems */
5698 wait_queue_head_t ext4__ioend_wq
[EXT4_WQ_HASH_SZ
];
5700 static int __init
ext4_init_fs(void)
5704 ratelimit_state_init(&ext4_mount_msg_ratelimit
, 30 * HZ
, 64);
5705 ext4_li_info
= NULL
;
5706 mutex_init(&ext4_li_mtx
);
5708 /* Build-time check for flags consistency */
5709 ext4_check_flag_values();
5711 for (i
= 0; i
< EXT4_WQ_HASH_SZ
; i
++)
5712 init_waitqueue_head(&ext4__ioend_wq
[i
]);
5714 err
= ext4_init_es();
5718 err
= ext4_init_pageio();
5722 err
= ext4_init_system_zone();
5726 err
= ext4_init_sysfs();
5730 err
= ext4_init_mballoc();
5733 err
= init_inodecache();
5738 err
= register_filesystem(&ext4_fs_type
);
5744 unregister_as_ext2();
5745 unregister_as_ext3();
5746 destroy_inodecache();
5748 ext4_exit_mballoc();
5752 ext4_exit_system_zone();
5761 static void __exit
ext4_exit_fs(void)
5763 ext4_destroy_lazyinit_thread();
5764 unregister_as_ext2();
5765 unregister_as_ext3();
5766 unregister_filesystem(&ext4_fs_type
);
5767 destroy_inodecache();
5768 ext4_exit_mballoc();
5770 ext4_exit_system_zone();
5775 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5776 MODULE_DESCRIPTION("Fourth Extended Filesystem");
5777 MODULE_LICENSE("GPL");
5778 module_init(ext4_init_fs
)
5779 module_exit(ext4_exit_fs
)