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 /* Use our quota_off function to clear inode flags etc. */
852 for (type
= 0; type
< EXT4_MAXQUOTAS
; type
++)
853 ext4_quota_off(sb
, type
);
856 static inline void ext4_quota_off_umount(struct super_block
*sb
)
861 static void ext4_put_super(struct super_block
*sb
)
863 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
864 struct ext4_super_block
*es
= sbi
->s_es
;
868 ext4_unregister_li_request(sb
);
869 ext4_quota_off_umount(sb
);
871 flush_workqueue(sbi
->rsv_conversion_wq
);
872 destroy_workqueue(sbi
->rsv_conversion_wq
);
874 if (sbi
->s_journal
) {
875 aborted
= is_journal_aborted(sbi
->s_journal
);
876 err
= jbd2_journal_destroy(sbi
->s_journal
);
877 sbi
->s_journal
= NULL
;
878 if ((err
< 0) && !aborted
)
879 ext4_abort(sb
, "Couldn't clean up the journal");
882 ext4_unregister_sysfs(sb
);
883 ext4_es_unregister_shrinker(sbi
);
884 del_timer_sync(&sbi
->s_err_report
);
885 ext4_release_system_zone(sb
);
887 ext4_ext_release(sb
);
889 if (!(sb
->s_flags
& MS_RDONLY
) && !aborted
) {
890 ext4_clear_feature_journal_needs_recovery(sb
);
891 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
893 if (!(sb
->s_flags
& MS_RDONLY
))
894 ext4_commit_super(sb
, 1);
896 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
897 brelse(sbi
->s_group_desc
[i
]);
898 kvfree(sbi
->s_group_desc
);
899 kvfree(sbi
->s_flex_groups
);
900 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
901 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
902 percpu_counter_destroy(&sbi
->s_dirs_counter
);
903 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
904 percpu_free_rwsem(&sbi
->s_journal_flag_rwsem
);
906 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
907 kfree(sbi
->s_qf_names
[i
]);
910 /* Debugging code just in case the in-memory inode orphan list
911 * isn't empty. The on-disk one can be non-empty if we've
912 * detected an error and taken the fs readonly, but the
913 * in-memory list had better be clean by this point. */
914 if (!list_empty(&sbi
->s_orphan
))
915 dump_orphan_list(sb
, sbi
);
916 J_ASSERT(list_empty(&sbi
->s_orphan
));
918 sync_blockdev(sb
->s_bdev
);
919 invalidate_bdev(sb
->s_bdev
);
920 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
922 * Invalidate the journal device's buffers. We don't want them
923 * floating about in memory - the physical journal device may
924 * hotswapped, and it breaks the `ro-after' testing code.
926 sync_blockdev(sbi
->journal_bdev
);
927 invalidate_bdev(sbi
->journal_bdev
);
928 ext4_blkdev_remove(sbi
);
930 if (sbi
->s_mb_cache
) {
931 ext4_xattr_destroy_cache(sbi
->s_mb_cache
);
932 sbi
->s_mb_cache
= NULL
;
935 kthread_stop(sbi
->s_mmp_tsk
);
937 sb
->s_fs_info
= NULL
;
939 * Now that we are completely done shutting down the
940 * superblock, we need to actually destroy the kobject.
942 kobject_put(&sbi
->s_kobj
);
943 wait_for_completion(&sbi
->s_kobj_unregister
);
944 if (sbi
->s_chksum_driver
)
945 crypto_free_shash(sbi
->s_chksum_driver
);
946 kfree(sbi
->s_blockgroup_lock
);
950 static struct kmem_cache
*ext4_inode_cachep
;
953 * Called inside transaction, so use GFP_NOFS
955 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
957 struct ext4_inode_info
*ei
;
959 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
963 ei
->vfs_inode
.i_version
= 1;
964 spin_lock_init(&ei
->i_raw_lock
);
965 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
966 spin_lock_init(&ei
->i_prealloc_lock
);
967 ext4_es_init_tree(&ei
->i_es_tree
);
968 rwlock_init(&ei
->i_es_lock
);
969 INIT_LIST_HEAD(&ei
->i_es_list
);
972 ei
->i_es_shrink_lblk
= 0;
973 ei
->i_reserved_data_blocks
= 0;
974 ei
->i_reserved_meta_blocks
= 0;
975 ei
->i_allocated_meta_blocks
= 0;
976 ei
->i_da_metadata_calc_len
= 0;
977 ei
->i_da_metadata_calc_last_lblock
= 0;
978 spin_lock_init(&(ei
->i_block_reservation_lock
));
980 ei
->i_reserved_quota
= 0;
981 memset(&ei
->i_dquot
, 0, sizeof(ei
->i_dquot
));
984 INIT_LIST_HEAD(&ei
->i_rsv_conversion_list
);
985 spin_lock_init(&ei
->i_completed_io_lock
);
987 ei
->i_datasync_tid
= 0;
988 atomic_set(&ei
->i_unwritten
, 0);
989 INIT_WORK(&ei
->i_rsv_conversion_work
, ext4_end_io_rsv_work
);
990 return &ei
->vfs_inode
;
993 static int ext4_drop_inode(struct inode
*inode
)
995 int drop
= generic_drop_inode(inode
);
997 trace_ext4_drop_inode(inode
, drop
);
1001 static void ext4_i_callback(struct rcu_head
*head
)
1003 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
1004 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
1007 static void ext4_destroy_inode(struct inode
*inode
)
1009 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
1010 ext4_msg(inode
->i_sb
, KERN_ERR
,
1011 "Inode %lu (%p): orphan list check failed!",
1012 inode
->i_ino
, EXT4_I(inode
));
1013 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
1014 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
1018 call_rcu(&inode
->i_rcu
, ext4_i_callback
);
1021 static void init_once(void *foo
)
1023 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
1025 INIT_LIST_HEAD(&ei
->i_orphan
);
1026 init_rwsem(&ei
->xattr_sem
);
1027 init_rwsem(&ei
->i_data_sem
);
1028 init_rwsem(&ei
->i_mmap_sem
);
1029 inode_init_once(&ei
->vfs_inode
);
1032 static int __init
init_inodecache(void)
1034 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
1035 sizeof(struct ext4_inode_info
),
1036 0, (SLAB_RECLAIM_ACCOUNT
|
1037 SLAB_MEM_SPREAD
|SLAB_ACCOUNT
),
1039 if (ext4_inode_cachep
== NULL
)
1044 static void destroy_inodecache(void)
1047 * Make sure all delayed rcu free inodes are flushed before we
1051 kmem_cache_destroy(ext4_inode_cachep
);
1054 void ext4_clear_inode(struct inode
*inode
)
1056 invalidate_inode_buffers(inode
);
1059 ext4_discard_preallocations(inode
);
1060 ext4_es_remove_extent(inode
, 0, EXT_MAX_BLOCKS
);
1061 if (EXT4_I(inode
)->jinode
) {
1062 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode
),
1063 EXT4_I(inode
)->jinode
);
1064 jbd2_free_inode(EXT4_I(inode
)->jinode
);
1065 EXT4_I(inode
)->jinode
= NULL
;
1067 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1068 fscrypt_put_encryption_info(inode
, NULL
);
1072 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
1073 u64 ino
, u32 generation
)
1075 struct inode
*inode
;
1077 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
1078 return ERR_PTR(-ESTALE
);
1079 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
1080 return ERR_PTR(-ESTALE
);
1082 /* iget isn't really right if the inode is currently unallocated!!
1084 * ext4_read_inode will return a bad_inode if the inode had been
1085 * deleted, so we should be safe.
1087 * Currently we don't know the generation for parent directory, so
1088 * a generation of 0 means "accept any"
1090 inode
= ext4_iget_normal(sb
, ino
);
1092 return ERR_CAST(inode
);
1093 if (generation
&& inode
->i_generation
!= generation
) {
1095 return ERR_PTR(-ESTALE
);
1101 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
1102 int fh_len
, int fh_type
)
1104 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
1105 ext4_nfs_get_inode
);
1108 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
1109 int fh_len
, int fh_type
)
1111 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
1112 ext4_nfs_get_inode
);
1116 * Try to release metadata pages (indirect blocks, directories) which are
1117 * mapped via the block device. Since these pages could have journal heads
1118 * which would prevent try_to_free_buffers() from freeing them, we must use
1119 * jbd2 layer's try_to_free_buffers() function to release them.
1121 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
1124 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
1126 WARN_ON(PageChecked(page
));
1127 if (!page_has_buffers(page
))
1130 return jbd2_journal_try_to_free_buffers(journal
, page
,
1131 wait
& ~__GFP_DIRECT_RECLAIM
);
1132 return try_to_free_buffers(page
);
1135 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1136 static int ext4_get_context(struct inode
*inode
, void *ctx
, size_t len
)
1138 return ext4_xattr_get(inode
, EXT4_XATTR_INDEX_ENCRYPTION
,
1139 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT
, ctx
, len
);
1142 static int ext4_set_context(struct inode
*inode
, const void *ctx
, size_t len
,
1145 handle_t
*handle
= fs_data
;
1146 int res
, res2
, retries
= 0;
1148 res
= ext4_convert_inline_data(inode
);
1153 * If a journal handle was specified, then the encryption context is
1154 * being set on a new inode via inheritance and is part of a larger
1155 * transaction to create the inode. Otherwise the encryption context is
1156 * being set on an existing inode in its own transaction. Only in the
1157 * latter case should the "retry on ENOSPC" logic be used.
1161 res
= ext4_xattr_set_handle(handle
, inode
,
1162 EXT4_XATTR_INDEX_ENCRYPTION
,
1163 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT
,
1166 ext4_set_inode_flag(inode
, EXT4_INODE_ENCRYPT
);
1167 ext4_clear_inode_state(inode
,
1168 EXT4_STATE_MAY_INLINE_DATA
);
1170 * Update inode->i_flags - e.g. S_DAX may get disabled
1172 ext4_set_inode_flags(inode
);
1177 res
= dquot_initialize(inode
);
1181 handle
= ext4_journal_start(inode
, EXT4_HT_MISC
,
1182 ext4_jbd2_credits_xattr(inode
));
1184 return PTR_ERR(handle
);
1186 res
= ext4_xattr_set_handle(handle
, inode
, EXT4_XATTR_INDEX_ENCRYPTION
,
1187 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT
,
1190 ext4_set_inode_flag(inode
, EXT4_INODE_ENCRYPT
);
1191 /* Update inode->i_flags - e.g. S_DAX may get disabled */
1192 ext4_set_inode_flags(inode
);
1193 res
= ext4_mark_inode_dirty(handle
, inode
);
1195 EXT4_ERROR_INODE(inode
, "Failed to mark inode dirty");
1197 res2
= ext4_journal_stop(handle
);
1199 if (res
== -ENOSPC
&& ext4_should_retry_alloc(inode
->i_sb
, &retries
))
1206 static bool ext4_dummy_context(struct inode
*inode
)
1208 return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode
->i_sb
));
1211 static unsigned ext4_max_namelen(struct inode
*inode
)
1213 return S_ISLNK(inode
->i_mode
) ? inode
->i_sb
->s_blocksize
:
1217 static const struct fscrypt_operations ext4_cryptops
= {
1218 .key_prefix
= "ext4:",
1219 .get_context
= ext4_get_context
,
1220 .set_context
= ext4_set_context
,
1221 .dummy_context
= ext4_dummy_context
,
1222 .is_encrypted
= ext4_encrypted_inode
,
1223 .empty_dir
= ext4_empty_dir
,
1224 .max_namelen
= ext4_max_namelen
,
1227 static const struct fscrypt_operations ext4_cryptops
= {
1228 .is_encrypted
= ext4_encrypted_inode
,
1233 static const char * const quotatypes
[] = INITQFNAMES
;
1234 #define QTYPE2NAME(t) (quotatypes[t])
1236 static int ext4_write_dquot(struct dquot
*dquot
);
1237 static int ext4_acquire_dquot(struct dquot
*dquot
);
1238 static int ext4_release_dquot(struct dquot
*dquot
);
1239 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1240 static int ext4_write_info(struct super_block
*sb
, int type
);
1241 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1242 const struct path
*path
);
1243 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1244 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1245 size_t len
, loff_t off
);
1246 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1247 const char *data
, size_t len
, loff_t off
);
1248 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
1249 unsigned int flags
);
1250 static int ext4_enable_quotas(struct super_block
*sb
);
1251 static int ext4_get_next_id(struct super_block
*sb
, struct kqid
*qid
);
1253 static struct dquot
**ext4_get_dquots(struct inode
*inode
)
1255 return EXT4_I(inode
)->i_dquot
;
1258 static const struct dquot_operations ext4_quota_operations
= {
1259 .get_reserved_space
= ext4_get_reserved_space
,
1260 .write_dquot
= ext4_write_dquot
,
1261 .acquire_dquot
= ext4_acquire_dquot
,
1262 .release_dquot
= ext4_release_dquot
,
1263 .mark_dirty
= ext4_mark_dquot_dirty
,
1264 .write_info
= ext4_write_info
,
1265 .alloc_dquot
= dquot_alloc
,
1266 .destroy_dquot
= dquot_destroy
,
1267 .get_projid
= ext4_get_projid
,
1268 .get_next_id
= ext4_get_next_id
,
1271 static const struct quotactl_ops ext4_qctl_operations
= {
1272 .quota_on
= ext4_quota_on
,
1273 .quota_off
= ext4_quota_off
,
1274 .quota_sync
= dquot_quota_sync
,
1275 .get_state
= dquot_get_state
,
1276 .set_info
= dquot_set_dqinfo
,
1277 .get_dqblk
= dquot_get_dqblk
,
1278 .set_dqblk
= dquot_set_dqblk
,
1279 .get_nextdqblk
= dquot_get_next_dqblk
,
1283 static const struct super_operations ext4_sops
= {
1284 .alloc_inode
= ext4_alloc_inode
,
1285 .destroy_inode
= ext4_destroy_inode
,
1286 .write_inode
= ext4_write_inode
,
1287 .dirty_inode
= ext4_dirty_inode
,
1288 .drop_inode
= ext4_drop_inode
,
1289 .evict_inode
= ext4_evict_inode
,
1290 .put_super
= ext4_put_super
,
1291 .sync_fs
= ext4_sync_fs
,
1292 .freeze_fs
= ext4_freeze
,
1293 .unfreeze_fs
= ext4_unfreeze
,
1294 .statfs
= ext4_statfs
,
1295 .remount_fs
= ext4_remount
,
1296 .show_options
= ext4_show_options
,
1298 .quota_read
= ext4_quota_read
,
1299 .quota_write
= ext4_quota_write
,
1300 .get_dquots
= ext4_get_dquots
,
1302 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1305 static const struct export_operations ext4_export_ops
= {
1306 .fh_to_dentry
= ext4_fh_to_dentry
,
1307 .fh_to_parent
= ext4_fh_to_parent
,
1308 .get_parent
= ext4_get_parent
,
1312 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1313 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1314 Opt_nouid32
, Opt_debug
, Opt_removed
,
1315 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1316 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
,
1317 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
, Opt_journal_dev
,
1318 Opt_journal_path
, Opt_journal_checksum
, Opt_journal_async_commit
,
1319 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1320 Opt_data_err_abort
, Opt_data_err_ignore
, Opt_test_dummy_encryption
,
1321 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1322 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1323 Opt_noquota
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1324 Opt_usrquota
, Opt_grpquota
, Opt_prjquota
, Opt_i_version
, Opt_dax
,
1325 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
, Opt_mblk_io_submit
,
1326 Opt_lazytime
, Opt_nolazytime
, Opt_debug_want_extra_isize
,
1327 Opt_nomblk_io_submit
, Opt_block_validity
, Opt_noblock_validity
,
1328 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1329 Opt_dioread_nolock
, Opt_dioread_lock
,
1330 Opt_discard
, Opt_nodiscard
, Opt_init_itable
, Opt_noinit_itable
,
1331 Opt_max_dir_size_kb
, Opt_nojournal_checksum
,
1334 static const match_table_t tokens
= {
1335 {Opt_bsd_df
, "bsddf"},
1336 {Opt_minix_df
, "minixdf"},
1337 {Opt_grpid
, "grpid"},
1338 {Opt_grpid
, "bsdgroups"},
1339 {Opt_nogrpid
, "nogrpid"},
1340 {Opt_nogrpid
, "sysvgroups"},
1341 {Opt_resgid
, "resgid=%u"},
1342 {Opt_resuid
, "resuid=%u"},
1344 {Opt_err_cont
, "errors=continue"},
1345 {Opt_err_panic
, "errors=panic"},
1346 {Opt_err_ro
, "errors=remount-ro"},
1347 {Opt_nouid32
, "nouid32"},
1348 {Opt_debug
, "debug"},
1349 {Opt_removed
, "oldalloc"},
1350 {Opt_removed
, "orlov"},
1351 {Opt_user_xattr
, "user_xattr"},
1352 {Opt_nouser_xattr
, "nouser_xattr"},
1354 {Opt_noacl
, "noacl"},
1355 {Opt_noload
, "norecovery"},
1356 {Opt_noload
, "noload"},
1357 {Opt_removed
, "nobh"},
1358 {Opt_removed
, "bh"},
1359 {Opt_commit
, "commit=%u"},
1360 {Opt_min_batch_time
, "min_batch_time=%u"},
1361 {Opt_max_batch_time
, "max_batch_time=%u"},
1362 {Opt_journal_dev
, "journal_dev=%u"},
1363 {Opt_journal_path
, "journal_path=%s"},
1364 {Opt_journal_checksum
, "journal_checksum"},
1365 {Opt_nojournal_checksum
, "nojournal_checksum"},
1366 {Opt_journal_async_commit
, "journal_async_commit"},
1367 {Opt_abort
, "abort"},
1368 {Opt_data_journal
, "data=journal"},
1369 {Opt_data_ordered
, "data=ordered"},
1370 {Opt_data_writeback
, "data=writeback"},
1371 {Opt_data_err_abort
, "data_err=abort"},
1372 {Opt_data_err_ignore
, "data_err=ignore"},
1373 {Opt_offusrjquota
, "usrjquota="},
1374 {Opt_usrjquota
, "usrjquota=%s"},
1375 {Opt_offgrpjquota
, "grpjquota="},
1376 {Opt_grpjquota
, "grpjquota=%s"},
1377 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1378 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1379 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1380 {Opt_grpquota
, "grpquota"},
1381 {Opt_noquota
, "noquota"},
1382 {Opt_quota
, "quota"},
1383 {Opt_usrquota
, "usrquota"},
1384 {Opt_prjquota
, "prjquota"},
1385 {Opt_barrier
, "barrier=%u"},
1386 {Opt_barrier
, "barrier"},
1387 {Opt_nobarrier
, "nobarrier"},
1388 {Opt_i_version
, "i_version"},
1390 {Opt_stripe
, "stripe=%u"},
1391 {Opt_delalloc
, "delalloc"},
1392 {Opt_lazytime
, "lazytime"},
1393 {Opt_nolazytime
, "nolazytime"},
1394 {Opt_debug_want_extra_isize
, "debug_want_extra_isize=%u"},
1395 {Opt_nodelalloc
, "nodelalloc"},
1396 {Opt_removed
, "mblk_io_submit"},
1397 {Opt_removed
, "nomblk_io_submit"},
1398 {Opt_block_validity
, "block_validity"},
1399 {Opt_noblock_validity
, "noblock_validity"},
1400 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1401 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1402 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1403 {Opt_auto_da_alloc
, "auto_da_alloc"},
1404 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1405 {Opt_dioread_nolock
, "dioread_nolock"},
1406 {Opt_dioread_lock
, "dioread_lock"},
1407 {Opt_discard
, "discard"},
1408 {Opt_nodiscard
, "nodiscard"},
1409 {Opt_init_itable
, "init_itable=%u"},
1410 {Opt_init_itable
, "init_itable"},
1411 {Opt_noinit_itable
, "noinit_itable"},
1412 {Opt_max_dir_size_kb
, "max_dir_size_kb=%u"},
1413 {Opt_test_dummy_encryption
, "test_dummy_encryption"},
1414 {Opt_removed
, "check=none"}, /* mount option from ext2/3 */
1415 {Opt_removed
, "nocheck"}, /* mount option from ext2/3 */
1416 {Opt_removed
, "reservation"}, /* mount option from ext2/3 */
1417 {Opt_removed
, "noreservation"}, /* mount option from ext2/3 */
1418 {Opt_removed
, "journal=%u"}, /* mount option from ext2/3 */
1422 static ext4_fsblk_t
get_sb_block(void **data
)
1424 ext4_fsblk_t sb_block
;
1425 char *options
= (char *) *data
;
1427 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1428 return 1; /* Default location */
1431 /* TODO: use simple_strtoll with >32bit ext4 */
1432 sb_block
= simple_strtoul(options
, &options
, 0);
1433 if (*options
&& *options
!= ',') {
1434 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1438 if (*options
== ',')
1440 *data
= (void *) options
;
1445 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1446 static const char deprecated_msg
[] =
1447 "Mount option \"%s\" will be removed by %s\n"
1448 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1451 static int set_qf_name(struct super_block
*sb
, int qtype
, substring_t
*args
)
1453 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1457 if (sb_any_quota_loaded(sb
) &&
1458 !sbi
->s_qf_names
[qtype
]) {
1459 ext4_msg(sb
, KERN_ERR
,
1460 "Cannot change journaled "
1461 "quota options when quota turned on");
1464 if (ext4_has_feature_quota(sb
)) {
1465 ext4_msg(sb
, KERN_INFO
, "Journaled quota options "
1466 "ignored when QUOTA feature is enabled");
1469 qname
= match_strdup(args
);
1471 ext4_msg(sb
, KERN_ERR
,
1472 "Not enough memory for storing quotafile name");
1475 if (sbi
->s_qf_names
[qtype
]) {
1476 if (strcmp(sbi
->s_qf_names
[qtype
], qname
) == 0)
1479 ext4_msg(sb
, KERN_ERR
,
1480 "%s quota file already specified",
1484 if (strchr(qname
, '/')) {
1485 ext4_msg(sb
, KERN_ERR
,
1486 "quotafile must be on filesystem root");
1489 sbi
->s_qf_names
[qtype
] = qname
;
1497 static int clear_qf_name(struct super_block
*sb
, int qtype
)
1500 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1502 if (sb_any_quota_loaded(sb
) &&
1503 sbi
->s_qf_names
[qtype
]) {
1504 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled quota options"
1505 " when quota turned on");
1508 kfree(sbi
->s_qf_names
[qtype
]);
1509 sbi
->s_qf_names
[qtype
] = NULL
;
1514 #define MOPT_SET 0x0001
1515 #define MOPT_CLEAR 0x0002
1516 #define MOPT_NOSUPPORT 0x0004
1517 #define MOPT_EXPLICIT 0x0008
1518 #define MOPT_CLEAR_ERR 0x0010
1519 #define MOPT_GTE0 0x0020
1522 #define MOPT_QFMT 0x0040
1524 #define MOPT_Q MOPT_NOSUPPORT
1525 #define MOPT_QFMT MOPT_NOSUPPORT
1527 #define MOPT_DATAJ 0x0080
1528 #define MOPT_NO_EXT2 0x0100
1529 #define MOPT_NO_EXT3 0x0200
1530 #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1531 #define MOPT_STRING 0x0400
1533 static const struct mount_opts
{
1537 } ext4_mount_opts
[] = {
1538 {Opt_minix_df
, EXT4_MOUNT_MINIX_DF
, MOPT_SET
},
1539 {Opt_bsd_df
, EXT4_MOUNT_MINIX_DF
, MOPT_CLEAR
},
1540 {Opt_grpid
, EXT4_MOUNT_GRPID
, MOPT_SET
},
1541 {Opt_nogrpid
, EXT4_MOUNT_GRPID
, MOPT_CLEAR
},
1542 {Opt_block_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_SET
},
1543 {Opt_noblock_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_CLEAR
},
1544 {Opt_dioread_nolock
, EXT4_MOUNT_DIOREAD_NOLOCK
,
1545 MOPT_EXT4_ONLY
| MOPT_SET
},
1546 {Opt_dioread_lock
, EXT4_MOUNT_DIOREAD_NOLOCK
,
1547 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1548 {Opt_discard
, EXT4_MOUNT_DISCARD
, MOPT_SET
},
1549 {Opt_nodiscard
, EXT4_MOUNT_DISCARD
, MOPT_CLEAR
},
1550 {Opt_delalloc
, EXT4_MOUNT_DELALLOC
,
1551 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1552 {Opt_nodelalloc
, EXT4_MOUNT_DELALLOC
,
1553 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1554 {Opt_nojournal_checksum
, EXT4_MOUNT_JOURNAL_CHECKSUM
,
1555 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1556 {Opt_journal_checksum
, EXT4_MOUNT_JOURNAL_CHECKSUM
,
1557 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1558 {Opt_journal_async_commit
, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT
|
1559 EXT4_MOUNT_JOURNAL_CHECKSUM
),
1560 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1561 {Opt_noload
, EXT4_MOUNT_NOLOAD
, MOPT_NO_EXT2
| MOPT_SET
},
1562 {Opt_err_panic
, EXT4_MOUNT_ERRORS_PANIC
, MOPT_SET
| MOPT_CLEAR_ERR
},
1563 {Opt_err_ro
, EXT4_MOUNT_ERRORS_RO
, MOPT_SET
| MOPT_CLEAR_ERR
},
1564 {Opt_err_cont
, EXT4_MOUNT_ERRORS_CONT
, MOPT_SET
| MOPT_CLEAR_ERR
},
1565 {Opt_data_err_abort
, EXT4_MOUNT_DATA_ERR_ABORT
,
1567 {Opt_data_err_ignore
, EXT4_MOUNT_DATA_ERR_ABORT
,
1569 {Opt_barrier
, EXT4_MOUNT_BARRIER
, MOPT_SET
},
1570 {Opt_nobarrier
, EXT4_MOUNT_BARRIER
, MOPT_CLEAR
},
1571 {Opt_noauto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_SET
},
1572 {Opt_auto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_CLEAR
},
1573 {Opt_noinit_itable
, EXT4_MOUNT_INIT_INODE_TABLE
, MOPT_CLEAR
},
1574 {Opt_commit
, 0, MOPT_GTE0
},
1575 {Opt_max_batch_time
, 0, MOPT_GTE0
},
1576 {Opt_min_batch_time
, 0, MOPT_GTE0
},
1577 {Opt_inode_readahead_blks
, 0, MOPT_GTE0
},
1578 {Opt_init_itable
, 0, MOPT_GTE0
},
1579 {Opt_dax
, EXT4_MOUNT_DAX
, MOPT_SET
},
1580 {Opt_stripe
, 0, MOPT_GTE0
},
1581 {Opt_resuid
, 0, MOPT_GTE0
},
1582 {Opt_resgid
, 0, MOPT_GTE0
},
1583 {Opt_journal_dev
, 0, MOPT_NO_EXT2
| MOPT_GTE0
},
1584 {Opt_journal_path
, 0, MOPT_NO_EXT2
| MOPT_STRING
},
1585 {Opt_journal_ioprio
, 0, MOPT_NO_EXT2
| MOPT_GTE0
},
1586 {Opt_data_journal
, EXT4_MOUNT_JOURNAL_DATA
, MOPT_NO_EXT2
| MOPT_DATAJ
},
1587 {Opt_data_ordered
, EXT4_MOUNT_ORDERED_DATA
, MOPT_NO_EXT2
| MOPT_DATAJ
},
1588 {Opt_data_writeback
, EXT4_MOUNT_WRITEBACK_DATA
,
1589 MOPT_NO_EXT2
| MOPT_DATAJ
},
1590 {Opt_user_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_SET
},
1591 {Opt_nouser_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_CLEAR
},
1592 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1593 {Opt_acl
, EXT4_MOUNT_POSIX_ACL
, MOPT_SET
},
1594 {Opt_noacl
, EXT4_MOUNT_POSIX_ACL
, MOPT_CLEAR
},
1596 {Opt_acl
, 0, MOPT_NOSUPPORT
},
1597 {Opt_noacl
, 0, MOPT_NOSUPPORT
},
1599 {Opt_nouid32
, EXT4_MOUNT_NO_UID32
, MOPT_SET
},
1600 {Opt_debug
, EXT4_MOUNT_DEBUG
, MOPT_SET
},
1601 {Opt_debug_want_extra_isize
, 0, MOPT_GTE0
},
1602 {Opt_quota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
, MOPT_SET
| MOPT_Q
},
1603 {Opt_usrquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
,
1605 {Opt_grpquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_GRPQUOTA
,
1607 {Opt_prjquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_PRJQUOTA
,
1609 {Opt_noquota
, (EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
|
1610 EXT4_MOUNT_GRPQUOTA
| EXT4_MOUNT_PRJQUOTA
),
1611 MOPT_CLEAR
| MOPT_Q
},
1612 {Opt_usrjquota
, 0, MOPT_Q
},
1613 {Opt_grpjquota
, 0, MOPT_Q
},
1614 {Opt_offusrjquota
, 0, MOPT_Q
},
1615 {Opt_offgrpjquota
, 0, MOPT_Q
},
1616 {Opt_jqfmt_vfsold
, QFMT_VFS_OLD
, MOPT_QFMT
},
1617 {Opt_jqfmt_vfsv0
, QFMT_VFS_V0
, MOPT_QFMT
},
1618 {Opt_jqfmt_vfsv1
, QFMT_VFS_V1
, MOPT_QFMT
},
1619 {Opt_max_dir_size_kb
, 0, MOPT_GTE0
},
1620 {Opt_test_dummy_encryption
, 0, MOPT_GTE0
},
1624 static int handle_mount_opt(struct super_block
*sb
, char *opt
, int token
,
1625 substring_t
*args
, unsigned long *journal_devnum
,
1626 unsigned int *journal_ioprio
, int is_remount
)
1628 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1629 const struct mount_opts
*m
;
1635 if (token
== Opt_usrjquota
)
1636 return set_qf_name(sb
, USRQUOTA
, &args
[0]);
1637 else if (token
== Opt_grpjquota
)
1638 return set_qf_name(sb
, GRPQUOTA
, &args
[0]);
1639 else if (token
== Opt_offusrjquota
)
1640 return clear_qf_name(sb
, USRQUOTA
);
1641 else if (token
== Opt_offgrpjquota
)
1642 return clear_qf_name(sb
, GRPQUOTA
);
1646 case Opt_nouser_xattr
:
1647 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, opt
, "3.5");
1650 return 1; /* handled by get_sb_block() */
1652 ext4_msg(sb
, KERN_WARNING
, "Ignoring removed %s option", opt
);
1655 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1658 sb
->s_flags
|= MS_I_VERSION
;
1661 sb
->s_flags
|= MS_LAZYTIME
;
1663 case Opt_nolazytime
:
1664 sb
->s_flags
&= ~MS_LAZYTIME
;
1668 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++)
1669 if (token
== m
->token
)
1672 if (m
->token
== Opt_err
) {
1673 ext4_msg(sb
, KERN_ERR
, "Unrecognized mount option \"%s\" "
1674 "or missing value", opt
);
1678 if ((m
->flags
& MOPT_NO_EXT2
) && IS_EXT2_SB(sb
)) {
1679 ext4_msg(sb
, KERN_ERR
,
1680 "Mount option \"%s\" incompatible with ext2", opt
);
1683 if ((m
->flags
& MOPT_NO_EXT3
) && IS_EXT3_SB(sb
)) {
1684 ext4_msg(sb
, KERN_ERR
,
1685 "Mount option \"%s\" incompatible with ext3", opt
);
1689 if (args
->from
&& !(m
->flags
& MOPT_STRING
) && match_int(args
, &arg
))
1691 if (args
->from
&& (m
->flags
& MOPT_GTE0
) && (arg
< 0))
1693 if (m
->flags
& MOPT_EXPLICIT
) {
1694 if (m
->mount_opt
& EXT4_MOUNT_DELALLOC
) {
1695 set_opt2(sb
, EXPLICIT_DELALLOC
);
1696 } else if (m
->mount_opt
& EXT4_MOUNT_JOURNAL_CHECKSUM
) {
1697 set_opt2(sb
, EXPLICIT_JOURNAL_CHECKSUM
);
1701 if (m
->flags
& MOPT_CLEAR_ERR
)
1702 clear_opt(sb
, ERRORS_MASK
);
1703 if (token
== Opt_noquota
&& sb_any_quota_loaded(sb
)) {
1704 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1705 "options when quota turned on");
1709 if (m
->flags
& MOPT_NOSUPPORT
) {
1710 ext4_msg(sb
, KERN_ERR
, "%s option not supported", opt
);
1711 } else if (token
== Opt_commit
) {
1713 arg
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1714 sbi
->s_commit_interval
= HZ
* arg
;
1715 } else if (token
== Opt_debug_want_extra_isize
) {
1716 sbi
->s_want_extra_isize
= arg
;
1717 } else if (token
== Opt_max_batch_time
) {
1718 sbi
->s_max_batch_time
= arg
;
1719 } else if (token
== Opt_min_batch_time
) {
1720 sbi
->s_min_batch_time
= arg
;
1721 } else if (token
== Opt_inode_readahead_blks
) {
1722 if (arg
&& (arg
> (1 << 30) || !is_power_of_2(arg
))) {
1723 ext4_msg(sb
, KERN_ERR
,
1724 "EXT4-fs: inode_readahead_blks must be "
1725 "0 or a power of 2 smaller than 2^31");
1728 sbi
->s_inode_readahead_blks
= arg
;
1729 } else if (token
== Opt_init_itable
) {
1730 set_opt(sb
, INIT_INODE_TABLE
);
1732 arg
= EXT4_DEF_LI_WAIT_MULT
;
1733 sbi
->s_li_wait_mult
= arg
;
1734 } else if (token
== Opt_max_dir_size_kb
) {
1735 sbi
->s_max_dir_size_kb
= arg
;
1736 } else if (token
== Opt_stripe
) {
1737 sbi
->s_stripe
= arg
;
1738 } else if (token
== Opt_resuid
) {
1739 uid
= make_kuid(current_user_ns(), arg
);
1740 if (!uid_valid(uid
)) {
1741 ext4_msg(sb
, KERN_ERR
, "Invalid uid value %d", arg
);
1744 sbi
->s_resuid
= uid
;
1745 } else if (token
== Opt_resgid
) {
1746 gid
= make_kgid(current_user_ns(), arg
);
1747 if (!gid_valid(gid
)) {
1748 ext4_msg(sb
, KERN_ERR
, "Invalid gid value %d", arg
);
1751 sbi
->s_resgid
= gid
;
1752 } else if (token
== Opt_journal_dev
) {
1754 ext4_msg(sb
, KERN_ERR
,
1755 "Cannot specify journal on remount");
1758 *journal_devnum
= arg
;
1759 } else if (token
== Opt_journal_path
) {
1761 struct inode
*journal_inode
;
1766 ext4_msg(sb
, KERN_ERR
,
1767 "Cannot specify journal on remount");
1770 journal_path
= match_strdup(&args
[0]);
1771 if (!journal_path
) {
1772 ext4_msg(sb
, KERN_ERR
, "error: could not dup "
1773 "journal device string");
1777 error
= kern_path(journal_path
, LOOKUP_FOLLOW
, &path
);
1779 ext4_msg(sb
, KERN_ERR
, "error: could not find "
1780 "journal device path: error %d", error
);
1781 kfree(journal_path
);
1785 journal_inode
= d_inode(path
.dentry
);
1786 if (!S_ISBLK(journal_inode
->i_mode
)) {
1787 ext4_msg(sb
, KERN_ERR
, "error: journal path %s "
1788 "is not a block device", journal_path
);
1790 kfree(journal_path
);
1794 *journal_devnum
= new_encode_dev(journal_inode
->i_rdev
);
1796 kfree(journal_path
);
1797 } else if (token
== Opt_journal_ioprio
) {
1799 ext4_msg(sb
, KERN_ERR
, "Invalid journal IO priority"
1804 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
, arg
);
1805 } else if (token
== Opt_test_dummy_encryption
) {
1806 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1807 sbi
->s_mount_flags
|= EXT4_MF_TEST_DUMMY_ENCRYPTION
;
1808 ext4_msg(sb
, KERN_WARNING
,
1809 "Test dummy encryption mode enabled");
1811 ext4_msg(sb
, KERN_WARNING
,
1812 "Test dummy encryption mount option ignored");
1814 } else if (m
->flags
& MOPT_DATAJ
) {
1816 if (!sbi
->s_journal
)
1817 ext4_msg(sb
, KERN_WARNING
, "Remounting file system with no journal so ignoring journalled data option");
1818 else if (test_opt(sb
, DATA_FLAGS
) != m
->mount_opt
) {
1819 ext4_msg(sb
, KERN_ERR
,
1820 "Cannot change data mode on remount");
1824 clear_opt(sb
, DATA_FLAGS
);
1825 sbi
->s_mount_opt
|= m
->mount_opt
;
1828 } else if (m
->flags
& MOPT_QFMT
) {
1829 if (sb_any_quota_loaded(sb
) &&
1830 sbi
->s_jquota_fmt
!= m
->mount_opt
) {
1831 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled "
1832 "quota options when quota turned on");
1835 if (ext4_has_feature_quota(sb
)) {
1836 ext4_msg(sb
, KERN_INFO
,
1837 "Quota format mount options ignored "
1838 "when QUOTA feature is enabled");
1841 sbi
->s_jquota_fmt
= m
->mount_opt
;
1843 } else if (token
== Opt_dax
) {
1844 #ifdef CONFIG_FS_DAX
1845 ext4_msg(sb
, KERN_WARNING
,
1846 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1847 sbi
->s_mount_opt
|= m
->mount_opt
;
1849 ext4_msg(sb
, KERN_INFO
, "dax option not supported");
1852 } else if (token
== Opt_data_err_abort
) {
1853 sbi
->s_mount_opt
|= m
->mount_opt
;
1854 } else if (token
== Opt_data_err_ignore
) {
1855 sbi
->s_mount_opt
&= ~m
->mount_opt
;
1859 if (m
->flags
& MOPT_CLEAR
)
1861 else if (unlikely(!(m
->flags
& MOPT_SET
))) {
1862 ext4_msg(sb
, KERN_WARNING
,
1863 "buggy handling of option %s", opt
);
1868 sbi
->s_mount_opt
|= m
->mount_opt
;
1870 sbi
->s_mount_opt
&= ~m
->mount_opt
;
1875 static int parse_options(char *options
, struct super_block
*sb
,
1876 unsigned long *journal_devnum
,
1877 unsigned int *journal_ioprio
,
1880 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1882 substring_t args
[MAX_OPT_ARGS
];
1888 while ((p
= strsep(&options
, ",")) != NULL
) {
1892 * Initialize args struct so we know whether arg was
1893 * found; some options take optional arguments.
1895 args
[0].to
= args
[0].from
= NULL
;
1896 token
= match_token(p
, tokens
, args
);
1897 if (handle_mount_opt(sb
, p
, token
, args
, journal_devnum
,
1898 journal_ioprio
, is_remount
) < 0)
1903 * We do the test below only for project quotas. 'usrquota' and
1904 * 'grpquota' mount options are allowed even without quota feature
1905 * to support legacy quotas in quota files.
1907 if (test_opt(sb
, PRJQUOTA
) && !ext4_has_feature_project(sb
)) {
1908 ext4_msg(sb
, KERN_ERR
, "Project quota feature not enabled. "
1909 "Cannot enable project quota enforcement.");
1912 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1913 if (test_opt(sb
, USRQUOTA
) && sbi
->s_qf_names
[USRQUOTA
])
1914 clear_opt(sb
, USRQUOTA
);
1916 if (test_opt(sb
, GRPQUOTA
) && sbi
->s_qf_names
[GRPQUOTA
])
1917 clear_opt(sb
, GRPQUOTA
);
1919 if (test_opt(sb
, GRPQUOTA
) || test_opt(sb
, USRQUOTA
)) {
1920 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1925 if (!sbi
->s_jquota_fmt
) {
1926 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1932 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
1934 BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
1936 if (blocksize
< PAGE_SIZE
) {
1937 ext4_msg(sb
, KERN_ERR
, "can't mount with "
1938 "dioread_nolock if block size != PAGE_SIZE");
1945 static inline void ext4_show_quota_options(struct seq_file
*seq
,
1946 struct super_block
*sb
)
1948 #if defined(CONFIG_QUOTA)
1949 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1951 if (sbi
->s_jquota_fmt
) {
1954 switch (sbi
->s_jquota_fmt
) {
1965 seq_printf(seq
, ",jqfmt=%s", fmtname
);
1968 if (sbi
->s_qf_names
[USRQUOTA
])
1969 seq_show_option(seq
, "usrjquota", sbi
->s_qf_names
[USRQUOTA
]);
1971 if (sbi
->s_qf_names
[GRPQUOTA
])
1972 seq_show_option(seq
, "grpjquota", sbi
->s_qf_names
[GRPQUOTA
]);
1976 static const char *token2str(int token
)
1978 const struct match_token
*t
;
1980 for (t
= tokens
; t
->token
!= Opt_err
; t
++)
1981 if (t
->token
== token
&& !strchr(t
->pattern
, '='))
1988 * - it's set to a non-default value OR
1989 * - if the per-sb default is different from the global default
1991 static int _ext4_show_options(struct seq_file
*seq
, struct super_block
*sb
,
1994 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1995 struct ext4_super_block
*es
= sbi
->s_es
;
1996 int def_errors
, def_mount_opt
= nodefs
? 0 : sbi
->s_def_mount_opt
;
1997 const struct mount_opts
*m
;
1998 char sep
= nodefs
? '\n' : ',';
2000 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2001 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2003 if (sbi
->s_sb_block
!= 1)
2004 SEQ_OPTS_PRINT("sb=%llu", sbi
->s_sb_block
);
2006 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++) {
2007 int want_set
= m
->flags
& MOPT_SET
;
2008 if (((m
->flags
& (MOPT_SET
|MOPT_CLEAR
)) == 0) ||
2009 (m
->flags
& MOPT_CLEAR_ERR
))
2011 if (!(m
->mount_opt
& (sbi
->s_mount_opt
^ def_mount_opt
)))
2012 continue; /* skip if same as the default */
2014 (sbi
->s_mount_opt
& m
->mount_opt
) != m
->mount_opt
) ||
2015 (!want_set
&& (sbi
->s_mount_opt
& m
->mount_opt
)))
2016 continue; /* select Opt_noFoo vs Opt_Foo */
2017 SEQ_OPTS_PRINT("%s", token2str(m
->token
));
2020 if (nodefs
|| !uid_eq(sbi
->s_resuid
, make_kuid(&init_user_ns
, EXT4_DEF_RESUID
)) ||
2021 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
)
2022 SEQ_OPTS_PRINT("resuid=%u",
2023 from_kuid_munged(&init_user_ns
, sbi
->s_resuid
));
2024 if (nodefs
|| !gid_eq(sbi
->s_resgid
, make_kgid(&init_user_ns
, EXT4_DEF_RESGID
)) ||
2025 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
)
2026 SEQ_OPTS_PRINT("resgid=%u",
2027 from_kgid_munged(&init_user_ns
, sbi
->s_resgid
));
2028 def_errors
= nodefs
? -1 : le16_to_cpu(es
->s_errors
);
2029 if (test_opt(sb
, ERRORS_RO
) && def_errors
!= EXT4_ERRORS_RO
)
2030 SEQ_OPTS_PUTS("errors=remount-ro");
2031 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
2032 SEQ_OPTS_PUTS("errors=continue");
2033 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
2034 SEQ_OPTS_PUTS("errors=panic");
2035 if (nodefs
|| sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
)
2036 SEQ_OPTS_PRINT("commit=%lu", sbi
->s_commit_interval
/ HZ
);
2037 if (nodefs
|| sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
)
2038 SEQ_OPTS_PRINT("min_batch_time=%u", sbi
->s_min_batch_time
);
2039 if (nodefs
|| sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
)
2040 SEQ_OPTS_PRINT("max_batch_time=%u", sbi
->s_max_batch_time
);
2041 if (sb
->s_flags
& MS_I_VERSION
)
2042 SEQ_OPTS_PUTS("i_version");
2043 if (nodefs
|| sbi
->s_stripe
)
2044 SEQ_OPTS_PRINT("stripe=%lu", sbi
->s_stripe
);
2045 if (EXT4_MOUNT_DATA_FLAGS
& (sbi
->s_mount_opt
^ def_mount_opt
)) {
2046 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
2047 SEQ_OPTS_PUTS("data=journal");
2048 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
2049 SEQ_OPTS_PUTS("data=ordered");
2050 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
2051 SEQ_OPTS_PUTS("data=writeback");
2054 sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
2055 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2056 sbi
->s_inode_readahead_blks
);
2058 if (nodefs
|| (test_opt(sb
, INIT_INODE_TABLE
) &&
2059 (sbi
->s_li_wait_mult
!= EXT4_DEF_LI_WAIT_MULT
)))
2060 SEQ_OPTS_PRINT("init_itable=%u", sbi
->s_li_wait_mult
);
2061 if (nodefs
|| sbi
->s_max_dir_size_kb
)
2062 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi
->s_max_dir_size_kb
);
2063 if (test_opt(sb
, DATA_ERR_ABORT
))
2064 SEQ_OPTS_PUTS("data_err=abort");
2066 ext4_show_quota_options(seq
, sb
);
2070 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
)
2072 return _ext4_show_options(seq
, root
->d_sb
, 0);
2075 int ext4_seq_options_show(struct seq_file
*seq
, void *offset
)
2077 struct super_block
*sb
= seq
->private;
2080 seq_puts(seq
, (sb
->s_flags
& MS_RDONLY
) ? "ro" : "rw");
2081 rc
= _ext4_show_options(seq
, sb
, 1);
2082 seq_puts(seq
, "\n");
2086 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
2089 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2092 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
2093 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
2094 "forcing read-only mode");
2099 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
2100 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
2101 "running e2fsck is recommended");
2102 else if (sbi
->s_mount_state
& EXT4_ERROR_FS
)
2103 ext4_msg(sb
, KERN_WARNING
,
2104 "warning: mounting fs with errors, "
2105 "running e2fsck is recommended");
2106 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) > 0 &&
2107 le16_to_cpu(es
->s_mnt_count
) >=
2108 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
2109 ext4_msg(sb
, KERN_WARNING
,
2110 "warning: maximal mount count reached, "
2111 "running e2fsck is recommended");
2112 else if (le32_to_cpu(es
->s_checkinterval
) &&
2113 (le32_to_cpu(es
->s_lastcheck
) +
2114 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
2115 ext4_msg(sb
, KERN_WARNING
,
2116 "warning: checktime reached, "
2117 "running e2fsck is recommended");
2118 if (!sbi
->s_journal
)
2119 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
2120 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
2121 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
2122 le16_add_cpu(&es
->s_mnt_count
, 1);
2123 es
->s_mtime
= cpu_to_le32(get_seconds());
2124 ext4_update_dynamic_rev(sb
);
2126 ext4_set_feature_journal_needs_recovery(sb
);
2128 ext4_commit_super(sb
, 1);
2130 if (test_opt(sb
, DEBUG
))
2131 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
2132 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
2134 sbi
->s_groups_count
,
2135 EXT4_BLOCKS_PER_GROUP(sb
),
2136 EXT4_INODES_PER_GROUP(sb
),
2137 sbi
->s_mount_opt
, sbi
->s_mount_opt2
);
2139 cleancache_init_fs(sb
);
2143 int ext4_alloc_flex_bg_array(struct super_block
*sb
, ext4_group_t ngroup
)
2145 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2146 struct flex_groups
*new_groups
;
2149 if (!sbi
->s_log_groups_per_flex
)
2152 size
= ext4_flex_group(sbi
, ngroup
- 1) + 1;
2153 if (size
<= sbi
->s_flex_groups_allocated
)
2156 size
= roundup_pow_of_two(size
* sizeof(struct flex_groups
));
2157 new_groups
= kvzalloc(size
, GFP_KERNEL
);
2159 ext4_msg(sb
, KERN_ERR
, "not enough memory for %d flex groups",
2160 size
/ (int) sizeof(struct flex_groups
));
2164 if (sbi
->s_flex_groups
) {
2165 memcpy(new_groups
, sbi
->s_flex_groups
,
2166 (sbi
->s_flex_groups_allocated
*
2167 sizeof(struct flex_groups
)));
2168 kvfree(sbi
->s_flex_groups
);
2170 sbi
->s_flex_groups
= new_groups
;
2171 sbi
->s_flex_groups_allocated
= size
/ sizeof(struct flex_groups
);
2175 static int ext4_fill_flex_info(struct super_block
*sb
)
2177 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2178 struct ext4_group_desc
*gdp
= NULL
;
2179 ext4_group_t flex_group
;
2182 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
2183 if (sbi
->s_log_groups_per_flex
< 1 || sbi
->s_log_groups_per_flex
> 31) {
2184 sbi
->s_log_groups_per_flex
= 0;
2188 err
= ext4_alloc_flex_bg_array(sb
, sbi
->s_groups_count
);
2192 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
2193 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2195 flex_group
= ext4_flex_group(sbi
, i
);
2196 atomic_add(ext4_free_inodes_count(sb
, gdp
),
2197 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
2198 atomic64_add(ext4_free_group_clusters(sb
, gdp
),
2199 &sbi
->s_flex_groups
[flex_group
].free_clusters
);
2200 atomic_add(ext4_used_dirs_count(sb
, gdp
),
2201 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
2209 static __le16
ext4_group_desc_csum(struct super_block
*sb
, __u32 block_group
,
2210 struct ext4_group_desc
*gdp
)
2212 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
2214 __le32 le_group
= cpu_to_le32(block_group
);
2215 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2217 if (ext4_has_metadata_csum(sbi
->s_sb
)) {
2218 /* Use new metadata_csum algorithm */
2220 __u16 dummy_csum
= 0;
2222 csum32
= ext4_chksum(sbi
, sbi
->s_csum_seed
, (__u8
*)&le_group
,
2224 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)gdp
, offset
);
2225 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)&dummy_csum
,
2226 sizeof(dummy_csum
));
2227 offset
+= sizeof(dummy_csum
);
2228 if (offset
< sbi
->s_desc_size
)
2229 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)gdp
+ offset
,
2230 sbi
->s_desc_size
- offset
);
2232 crc
= csum32
& 0xFFFF;
2236 /* old crc16 code */
2237 if (!ext4_has_feature_gdt_csum(sb
))
2240 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
2241 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
2242 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
2243 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
2244 /* for checksum of struct ext4_group_desc do the rest...*/
2245 if (ext4_has_feature_64bit(sb
) &&
2246 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
2247 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
2248 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
2252 return cpu_to_le16(crc
);
2255 int ext4_group_desc_csum_verify(struct super_block
*sb
, __u32 block_group
,
2256 struct ext4_group_desc
*gdp
)
2258 if (ext4_has_group_desc_csum(sb
) &&
2259 (gdp
->bg_checksum
!= ext4_group_desc_csum(sb
, block_group
, gdp
)))
2265 void ext4_group_desc_csum_set(struct super_block
*sb
, __u32 block_group
,
2266 struct ext4_group_desc
*gdp
)
2268 if (!ext4_has_group_desc_csum(sb
))
2270 gdp
->bg_checksum
= ext4_group_desc_csum(sb
, block_group
, gdp
);
2273 /* Called at mount-time, super-block is locked */
2274 static int ext4_check_descriptors(struct super_block
*sb
,
2275 ext4_fsblk_t sb_block
,
2276 ext4_group_t
*first_not_zeroed
)
2278 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2279 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
2280 ext4_fsblk_t last_block
;
2281 ext4_fsblk_t block_bitmap
;
2282 ext4_fsblk_t inode_bitmap
;
2283 ext4_fsblk_t inode_table
;
2284 int flexbg_flag
= 0;
2285 ext4_group_t i
, grp
= sbi
->s_groups_count
;
2287 if (ext4_has_feature_flex_bg(sb
))
2290 ext4_debug("Checking group descriptors");
2292 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
2293 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2295 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
2296 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
2298 last_block
= first_block
+
2299 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2301 if ((grp
== sbi
->s_groups_count
) &&
2302 !(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2305 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
2306 if (block_bitmap
== sb_block
) {
2307 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2308 "Block bitmap for group %u overlaps "
2311 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
2312 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2313 "Block bitmap for group %u not in group "
2314 "(block %llu)!", i
, block_bitmap
);
2317 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
2318 if (inode_bitmap
== sb_block
) {
2319 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2320 "Inode bitmap for group %u overlaps "
2323 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
2324 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2325 "Inode bitmap for group %u not in group "
2326 "(block %llu)!", i
, inode_bitmap
);
2329 inode_table
= ext4_inode_table(sb
, gdp
);
2330 if (inode_table
== sb_block
) {
2331 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2332 "Inode table for group %u overlaps "
2335 if (inode_table
< first_block
||
2336 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
2337 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2338 "Inode table for group %u not in group "
2339 "(block %llu)!", i
, inode_table
);
2342 ext4_lock_group(sb
, i
);
2343 if (!ext4_group_desc_csum_verify(sb
, i
, gdp
)) {
2344 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2345 "Checksum for group %u failed (%u!=%u)",
2346 i
, le16_to_cpu(ext4_group_desc_csum(sb
, i
,
2347 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
2348 if (!(sb
->s_flags
& MS_RDONLY
)) {
2349 ext4_unlock_group(sb
, i
);
2353 ext4_unlock_group(sb
, i
);
2355 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
2357 if (NULL
!= first_not_zeroed
)
2358 *first_not_zeroed
= grp
;
2362 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2363 * the superblock) which were deleted from all directories, but held open by
2364 * a process at the time of a crash. We walk the list and try to delete these
2365 * inodes at recovery time (only with a read-write filesystem).
2367 * In order to keep the orphan inode chain consistent during traversal (in
2368 * case of crash during recovery), we link each inode into the superblock
2369 * orphan list_head and handle it the same way as an inode deletion during
2370 * normal operation (which journals the operations for us).
2372 * We only do an iget() and an iput() on each inode, which is very safe if we
2373 * accidentally point at an in-use or already deleted inode. The worst that
2374 * can happen in this case is that we get a "bit already cleared" message from
2375 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2376 * e2fsck was run on this filesystem, and it must have already done the orphan
2377 * inode cleanup for us, so we can safely abort without any further action.
2379 static void ext4_orphan_cleanup(struct super_block
*sb
,
2380 struct ext4_super_block
*es
)
2382 unsigned int s_flags
= sb
->s_flags
;
2383 int ret
, nr_orphans
= 0, nr_truncates
= 0;
2387 if (!es
->s_last_orphan
) {
2388 jbd_debug(4, "no orphan inodes to clean up\n");
2392 if (bdev_read_only(sb
->s_bdev
)) {
2393 ext4_msg(sb
, KERN_ERR
, "write access "
2394 "unavailable, skipping orphan cleanup");
2398 /* Check if feature set would not allow a r/w mount */
2399 if (!ext4_feature_set_ok(sb
, 0)) {
2400 ext4_msg(sb
, KERN_INFO
, "Skipping orphan cleanup due to "
2401 "unknown ROCOMPAT features");
2405 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2406 /* don't clear list on RO mount w/ errors */
2407 if (es
->s_last_orphan
&& !(s_flags
& MS_RDONLY
)) {
2408 ext4_msg(sb
, KERN_INFO
, "Errors on filesystem, "
2409 "clearing orphan list.\n");
2410 es
->s_last_orphan
= 0;
2412 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2416 if (s_flags
& MS_RDONLY
) {
2417 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
2418 sb
->s_flags
&= ~MS_RDONLY
;
2421 /* Needed for iput() to work correctly and not trash data */
2422 sb
->s_flags
|= MS_ACTIVE
;
2423 /* Turn on quotas so that they are updated correctly */
2424 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++) {
2425 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
2426 int ret
= ext4_quota_on_mount(sb
, i
);
2428 ext4_msg(sb
, KERN_ERR
,
2429 "Cannot turn on journaled "
2430 "quota: error %d", ret
);
2435 while (es
->s_last_orphan
) {
2436 struct inode
*inode
;
2439 * We may have encountered an error during cleanup; if
2440 * so, skip the rest.
2442 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2443 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2444 es
->s_last_orphan
= 0;
2448 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
2449 if (IS_ERR(inode
)) {
2450 es
->s_last_orphan
= 0;
2454 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
2455 dquot_initialize(inode
);
2456 if (inode
->i_nlink
) {
2457 if (test_opt(sb
, DEBUG
))
2458 ext4_msg(sb
, KERN_DEBUG
,
2459 "%s: truncating inode %lu to %lld bytes",
2460 __func__
, inode
->i_ino
, inode
->i_size
);
2461 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2462 inode
->i_ino
, inode
->i_size
);
2464 truncate_inode_pages(inode
->i_mapping
, inode
->i_size
);
2465 ret
= ext4_truncate(inode
);
2467 ext4_std_error(inode
->i_sb
, ret
);
2468 inode_unlock(inode
);
2471 if (test_opt(sb
, DEBUG
))
2472 ext4_msg(sb
, KERN_DEBUG
,
2473 "%s: deleting unreferenced inode %lu",
2474 __func__
, inode
->i_ino
);
2475 jbd_debug(2, "deleting unreferenced inode %lu\n",
2479 iput(inode
); /* The delete magic happens here! */
2482 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2485 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
2486 PLURAL(nr_orphans
));
2488 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
2489 PLURAL(nr_truncates
));
2491 /* Turn quotas off */
2492 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++) {
2493 if (sb_dqopt(sb
)->files
[i
])
2494 dquot_quota_off(sb
, i
);
2497 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
2501 * Maximal extent format file size.
2502 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2503 * extent format containers, within a sector_t, and within i_blocks
2504 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2505 * so that won't be a limiting factor.
2507 * However there is other limiting factor. We do store extents in the form
2508 * of starting block and length, hence the resulting length of the extent
2509 * covering maximum file size must fit into on-disk format containers as
2510 * well. Given that length is always by 1 unit bigger than max unit (because
2511 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2513 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2515 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
2518 loff_t upper_limit
= MAX_LFS_FILESIZE
;
2520 /* small i_blocks in vfs inode? */
2521 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2523 * CONFIG_LBDAF is not enabled implies the inode
2524 * i_block represent total blocks in 512 bytes
2525 * 32 == size of vfs inode i_blocks * 8
2527 upper_limit
= (1LL << 32) - 1;
2529 /* total blocks in file system block size */
2530 upper_limit
>>= (blkbits
- 9);
2531 upper_limit
<<= blkbits
;
2535 * 32-bit extent-start container, ee_block. We lower the maxbytes
2536 * by one fs block, so ee_len can cover the extent of maximum file
2539 res
= (1LL << 32) - 1;
2542 /* Sanity check against vm- & vfs- imposed limits */
2543 if (res
> upper_limit
)
2550 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2551 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2552 * We need to be 1 filesystem block less than the 2^48 sector limit.
2554 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2556 loff_t res
= EXT4_NDIR_BLOCKS
;
2559 /* This is calculated to be the largest file size for a dense, block
2560 * mapped file such that the file's total number of 512-byte sectors,
2561 * including data and all indirect blocks, does not exceed (2^48 - 1).
2563 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2564 * number of 512-byte sectors of the file.
2567 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2569 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2570 * the inode i_block field represents total file blocks in
2571 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2573 upper_limit
= (1LL << 32) - 1;
2575 /* total blocks in file system block size */
2576 upper_limit
>>= (bits
- 9);
2580 * We use 48 bit ext4_inode i_blocks
2581 * With EXT4_HUGE_FILE_FL set the i_blocks
2582 * represent total number of blocks in
2583 * file system block size
2585 upper_limit
= (1LL << 48) - 1;
2589 /* indirect blocks */
2591 /* double indirect blocks */
2592 meta_blocks
+= 1 + (1LL << (bits
-2));
2593 /* tripple indirect blocks */
2594 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2596 upper_limit
-= meta_blocks
;
2597 upper_limit
<<= bits
;
2599 res
+= 1LL << (bits
-2);
2600 res
+= 1LL << (2*(bits
-2));
2601 res
+= 1LL << (3*(bits
-2));
2603 if (res
> upper_limit
)
2606 if (res
> MAX_LFS_FILESIZE
)
2607 res
= MAX_LFS_FILESIZE
;
2612 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2613 ext4_fsblk_t logical_sb_block
, int nr
)
2615 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2616 ext4_group_t bg
, first_meta_bg
;
2619 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2621 if (!ext4_has_feature_meta_bg(sb
) || nr
< first_meta_bg
)
2622 return logical_sb_block
+ nr
+ 1;
2623 bg
= sbi
->s_desc_per_block
* nr
;
2624 if (ext4_bg_has_super(sb
, bg
))
2628 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2629 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2630 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2633 if (sb
->s_blocksize
== 1024 && nr
== 0 &&
2634 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_first_data_block
) == 0)
2637 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2641 * ext4_get_stripe_size: Get the stripe size.
2642 * @sbi: In memory super block info
2644 * If we have specified it via mount option, then
2645 * use the mount option value. If the value specified at mount time is
2646 * greater than the blocks per group use the super block value.
2647 * If the super block value is greater than blocks per group return 0.
2648 * Allocator needs it be less than blocks per group.
2651 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2653 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2654 unsigned long stripe_width
=
2655 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2658 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2659 ret
= sbi
->s_stripe
;
2660 else if (stripe_width
&& stripe_width
<= sbi
->s_blocks_per_group
)
2662 else if (stride
&& stride
<= sbi
->s_blocks_per_group
)
2668 * If the stripe width is 1, this makes no sense and
2669 * we set it to 0 to turn off stripe handling code.
2678 * Check whether this filesystem can be mounted based on
2679 * the features present and the RDONLY/RDWR mount requested.
2680 * Returns 1 if this filesystem can be mounted as requested,
2681 * 0 if it cannot be.
2683 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2685 if (ext4_has_unknown_ext4_incompat_features(sb
)) {
2686 ext4_msg(sb
, KERN_ERR
,
2687 "Couldn't mount because of "
2688 "unsupported optional features (%x)",
2689 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2690 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2697 if (ext4_has_feature_readonly(sb
)) {
2698 ext4_msg(sb
, KERN_INFO
, "filesystem is read-only");
2699 sb
->s_flags
|= MS_RDONLY
;
2703 /* Check that feature set is OK for a read-write mount */
2704 if (ext4_has_unknown_ext4_ro_compat_features(sb
)) {
2705 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2706 "unsupported optional features (%x)",
2707 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2708 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2712 * Large file size enabled file system can only be mounted
2713 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2715 if (ext4_has_feature_huge_file(sb
)) {
2716 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2717 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2718 "cannot be mounted RDWR without "
2723 if (ext4_has_feature_bigalloc(sb
) && !ext4_has_feature_extents(sb
)) {
2724 ext4_msg(sb
, KERN_ERR
,
2725 "Can't support bigalloc feature without "
2726 "extents feature\n");
2730 #ifndef CONFIG_QUOTA
2731 if (ext4_has_feature_quota(sb
) && !readonly
) {
2732 ext4_msg(sb
, KERN_ERR
,
2733 "Filesystem with quota feature cannot be mounted RDWR "
2734 "without CONFIG_QUOTA");
2737 if (ext4_has_feature_project(sb
) && !readonly
) {
2738 ext4_msg(sb
, KERN_ERR
,
2739 "Filesystem with project quota feature cannot be mounted RDWR "
2740 "without CONFIG_QUOTA");
2743 #endif /* CONFIG_QUOTA */
2748 * This function is called once a day if we have errors logged
2749 * on the file system
2751 static void print_daily_error_info(unsigned long arg
)
2753 struct super_block
*sb
= (struct super_block
*) arg
;
2754 struct ext4_sb_info
*sbi
;
2755 struct ext4_super_block
*es
;
2760 if (es
->s_error_count
)
2761 /* fsck newer than v1.41.13 is needed to clean this condition. */
2762 ext4_msg(sb
, KERN_NOTICE
, "error count since last fsck: %u",
2763 le32_to_cpu(es
->s_error_count
));
2764 if (es
->s_first_error_time
) {
2765 printk(KERN_NOTICE
"EXT4-fs (%s): initial error at time %u: %.*s:%d",
2766 sb
->s_id
, le32_to_cpu(es
->s_first_error_time
),
2767 (int) sizeof(es
->s_first_error_func
),
2768 es
->s_first_error_func
,
2769 le32_to_cpu(es
->s_first_error_line
));
2770 if (es
->s_first_error_ino
)
2771 printk(KERN_CONT
": inode %u",
2772 le32_to_cpu(es
->s_first_error_ino
));
2773 if (es
->s_first_error_block
)
2774 printk(KERN_CONT
": block %llu", (unsigned long long)
2775 le64_to_cpu(es
->s_first_error_block
));
2776 printk(KERN_CONT
"\n");
2778 if (es
->s_last_error_time
) {
2779 printk(KERN_NOTICE
"EXT4-fs (%s): last error at time %u: %.*s:%d",
2780 sb
->s_id
, le32_to_cpu(es
->s_last_error_time
),
2781 (int) sizeof(es
->s_last_error_func
),
2782 es
->s_last_error_func
,
2783 le32_to_cpu(es
->s_last_error_line
));
2784 if (es
->s_last_error_ino
)
2785 printk(KERN_CONT
": inode %u",
2786 le32_to_cpu(es
->s_last_error_ino
));
2787 if (es
->s_last_error_block
)
2788 printk(KERN_CONT
": block %llu", (unsigned long long)
2789 le64_to_cpu(es
->s_last_error_block
));
2790 printk(KERN_CONT
"\n");
2792 mod_timer(&sbi
->s_err_report
, jiffies
+ 24*60*60*HZ
); /* Once a day */
2795 /* Find next suitable group and run ext4_init_inode_table */
2796 static int ext4_run_li_request(struct ext4_li_request
*elr
)
2798 struct ext4_group_desc
*gdp
= NULL
;
2799 ext4_group_t group
, ngroups
;
2800 struct super_block
*sb
;
2801 unsigned long timeout
= 0;
2805 ngroups
= EXT4_SB(sb
)->s_groups_count
;
2807 for (group
= elr
->lr_next_group
; group
< ngroups
; group
++) {
2808 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2814 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2818 if (group
>= ngroups
)
2823 ret
= ext4_init_inode_table(sb
, group
,
2824 elr
->lr_timeout
? 0 : 1);
2825 if (elr
->lr_timeout
== 0) {
2826 timeout
= (jiffies
- timeout
) *
2827 elr
->lr_sbi
->s_li_wait_mult
;
2828 elr
->lr_timeout
= timeout
;
2830 elr
->lr_next_sched
= jiffies
+ elr
->lr_timeout
;
2831 elr
->lr_next_group
= group
+ 1;
2837 * Remove lr_request from the list_request and free the
2838 * request structure. Should be called with li_list_mtx held
2840 static void ext4_remove_li_request(struct ext4_li_request
*elr
)
2842 struct ext4_sb_info
*sbi
;
2849 list_del(&elr
->lr_request
);
2850 sbi
->s_li_request
= NULL
;
2854 static void ext4_unregister_li_request(struct super_block
*sb
)
2856 mutex_lock(&ext4_li_mtx
);
2857 if (!ext4_li_info
) {
2858 mutex_unlock(&ext4_li_mtx
);
2862 mutex_lock(&ext4_li_info
->li_list_mtx
);
2863 ext4_remove_li_request(EXT4_SB(sb
)->s_li_request
);
2864 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2865 mutex_unlock(&ext4_li_mtx
);
2868 static struct task_struct
*ext4_lazyinit_task
;
2871 * This is the function where ext4lazyinit thread lives. It walks
2872 * through the request list searching for next scheduled filesystem.
2873 * When such a fs is found, run the lazy initialization request
2874 * (ext4_rn_li_request) and keep track of the time spend in this
2875 * function. Based on that time we compute next schedule time of
2876 * the request. When walking through the list is complete, compute
2877 * next waking time and put itself into sleep.
2879 static int ext4_lazyinit_thread(void *arg
)
2881 struct ext4_lazy_init
*eli
= (struct ext4_lazy_init
*)arg
;
2882 struct list_head
*pos
, *n
;
2883 struct ext4_li_request
*elr
;
2884 unsigned long next_wakeup
, cur
;
2886 BUG_ON(NULL
== eli
);
2890 next_wakeup
= MAX_JIFFY_OFFSET
;
2892 mutex_lock(&eli
->li_list_mtx
);
2893 if (list_empty(&eli
->li_request_list
)) {
2894 mutex_unlock(&eli
->li_list_mtx
);
2897 list_for_each_safe(pos
, n
, &eli
->li_request_list
) {
2900 elr
= list_entry(pos
, struct ext4_li_request
,
2903 if (time_before(jiffies
, elr
->lr_next_sched
)) {
2904 if (time_before(elr
->lr_next_sched
, next_wakeup
))
2905 next_wakeup
= elr
->lr_next_sched
;
2908 if (down_read_trylock(&elr
->lr_super
->s_umount
)) {
2909 if (sb_start_write_trylock(elr
->lr_super
)) {
2912 * We hold sb->s_umount, sb can not
2913 * be removed from the list, it is
2914 * now safe to drop li_list_mtx
2916 mutex_unlock(&eli
->li_list_mtx
);
2917 err
= ext4_run_li_request(elr
);
2918 sb_end_write(elr
->lr_super
);
2919 mutex_lock(&eli
->li_list_mtx
);
2922 up_read((&elr
->lr_super
->s_umount
));
2924 /* error, remove the lazy_init job */
2926 ext4_remove_li_request(elr
);
2930 elr
->lr_next_sched
= jiffies
+
2932 % (EXT4_DEF_LI_MAX_START_DELAY
* HZ
));
2934 if (time_before(elr
->lr_next_sched
, next_wakeup
))
2935 next_wakeup
= elr
->lr_next_sched
;
2937 mutex_unlock(&eli
->li_list_mtx
);
2942 if ((time_after_eq(cur
, next_wakeup
)) ||
2943 (MAX_JIFFY_OFFSET
== next_wakeup
)) {
2948 schedule_timeout_interruptible(next_wakeup
- cur
);
2950 if (kthread_should_stop()) {
2951 ext4_clear_request_list();
2958 * It looks like the request list is empty, but we need
2959 * to check it under the li_list_mtx lock, to prevent any
2960 * additions into it, and of course we should lock ext4_li_mtx
2961 * to atomically free the list and ext4_li_info, because at
2962 * this point another ext4 filesystem could be registering
2965 mutex_lock(&ext4_li_mtx
);
2966 mutex_lock(&eli
->li_list_mtx
);
2967 if (!list_empty(&eli
->li_request_list
)) {
2968 mutex_unlock(&eli
->li_list_mtx
);
2969 mutex_unlock(&ext4_li_mtx
);
2972 mutex_unlock(&eli
->li_list_mtx
);
2973 kfree(ext4_li_info
);
2974 ext4_li_info
= NULL
;
2975 mutex_unlock(&ext4_li_mtx
);
2980 static void ext4_clear_request_list(void)
2982 struct list_head
*pos
, *n
;
2983 struct ext4_li_request
*elr
;
2985 mutex_lock(&ext4_li_info
->li_list_mtx
);
2986 list_for_each_safe(pos
, n
, &ext4_li_info
->li_request_list
) {
2987 elr
= list_entry(pos
, struct ext4_li_request
,
2989 ext4_remove_li_request(elr
);
2991 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2994 static int ext4_run_lazyinit_thread(void)
2996 ext4_lazyinit_task
= kthread_run(ext4_lazyinit_thread
,
2997 ext4_li_info
, "ext4lazyinit");
2998 if (IS_ERR(ext4_lazyinit_task
)) {
2999 int err
= PTR_ERR(ext4_lazyinit_task
);
3000 ext4_clear_request_list();
3001 kfree(ext4_li_info
);
3002 ext4_li_info
= NULL
;
3003 printk(KERN_CRIT
"EXT4-fs: error %d creating inode table "
3004 "initialization thread\n",
3008 ext4_li_info
->li_state
|= EXT4_LAZYINIT_RUNNING
;
3013 * Check whether it make sense to run itable init. thread or not.
3014 * If there is at least one uninitialized inode table, return
3015 * corresponding group number, else the loop goes through all
3016 * groups and return total number of groups.
3018 static ext4_group_t
ext4_has_uninit_itable(struct super_block
*sb
)
3020 ext4_group_t group
, ngroups
= EXT4_SB(sb
)->s_groups_count
;
3021 struct ext4_group_desc
*gdp
= NULL
;
3023 for (group
= 0; group
< ngroups
; group
++) {
3024 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
3028 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
3035 static int ext4_li_info_new(void)
3037 struct ext4_lazy_init
*eli
= NULL
;
3039 eli
= kzalloc(sizeof(*eli
), GFP_KERNEL
);
3043 INIT_LIST_HEAD(&eli
->li_request_list
);
3044 mutex_init(&eli
->li_list_mtx
);
3046 eli
->li_state
|= EXT4_LAZYINIT_QUIT
;
3053 static struct ext4_li_request
*ext4_li_request_new(struct super_block
*sb
,
3056 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3057 struct ext4_li_request
*elr
;
3059 elr
= kzalloc(sizeof(*elr
), GFP_KERNEL
);
3065 elr
->lr_next_group
= start
;
3068 * Randomize first schedule time of the request to
3069 * spread the inode table initialization requests
3072 elr
->lr_next_sched
= jiffies
+ (prandom_u32() %
3073 (EXT4_DEF_LI_MAX_START_DELAY
* HZ
));
3077 int ext4_register_li_request(struct super_block
*sb
,
3078 ext4_group_t first_not_zeroed
)
3080 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3081 struct ext4_li_request
*elr
= NULL
;
3082 ext4_group_t ngroups
= EXT4_SB(sb
)->s_groups_count
;
3085 mutex_lock(&ext4_li_mtx
);
3086 if (sbi
->s_li_request
!= NULL
) {
3088 * Reset timeout so it can be computed again, because
3089 * s_li_wait_mult might have changed.
3091 sbi
->s_li_request
->lr_timeout
= 0;
3095 if (first_not_zeroed
== ngroups
||
3096 (sb
->s_flags
& MS_RDONLY
) ||
3097 !test_opt(sb
, INIT_INODE_TABLE
))
3100 elr
= ext4_li_request_new(sb
, first_not_zeroed
);
3106 if (NULL
== ext4_li_info
) {
3107 ret
= ext4_li_info_new();
3112 mutex_lock(&ext4_li_info
->li_list_mtx
);
3113 list_add(&elr
->lr_request
, &ext4_li_info
->li_request_list
);
3114 mutex_unlock(&ext4_li_info
->li_list_mtx
);
3116 sbi
->s_li_request
= elr
;
3118 * set elr to NULL here since it has been inserted to
3119 * the request_list and the removal and free of it is
3120 * handled by ext4_clear_request_list from now on.
3124 if (!(ext4_li_info
->li_state
& EXT4_LAZYINIT_RUNNING
)) {
3125 ret
= ext4_run_lazyinit_thread();
3130 mutex_unlock(&ext4_li_mtx
);
3137 * We do not need to lock anything since this is called on
3140 static void ext4_destroy_lazyinit_thread(void)
3143 * If thread exited earlier
3144 * there's nothing to be done.
3146 if (!ext4_li_info
|| !ext4_lazyinit_task
)
3149 kthread_stop(ext4_lazyinit_task
);
3152 static int set_journal_csum_feature_set(struct super_block
*sb
)
3155 int compat
, incompat
;
3156 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3158 if (ext4_has_metadata_csum(sb
)) {
3159 /* journal checksum v3 */
3161 incompat
= JBD2_FEATURE_INCOMPAT_CSUM_V3
;
3163 /* journal checksum v1 */
3164 compat
= JBD2_FEATURE_COMPAT_CHECKSUM
;
3168 jbd2_journal_clear_features(sbi
->s_journal
,
3169 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
3170 JBD2_FEATURE_INCOMPAT_CSUM_V3
|
3171 JBD2_FEATURE_INCOMPAT_CSUM_V2
);
3172 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
3173 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3175 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
|
3177 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
3178 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3181 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3182 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3184 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3185 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3192 * Note: calculating the overhead so we can be compatible with
3193 * historical BSD practice is quite difficult in the face of
3194 * clusters/bigalloc. This is because multiple metadata blocks from
3195 * different block group can end up in the same allocation cluster.
3196 * Calculating the exact overhead in the face of clustered allocation
3197 * requires either O(all block bitmaps) in memory or O(number of block
3198 * groups**2) in time. We will still calculate the superblock for
3199 * older file systems --- and if we come across with a bigalloc file
3200 * system with zero in s_overhead_clusters the estimate will be close to
3201 * correct especially for very large cluster sizes --- but for newer
3202 * file systems, it's better to calculate this figure once at mkfs
3203 * time, and store it in the superblock. If the superblock value is
3204 * present (even for non-bigalloc file systems), we will use it.
3206 static int count_overhead(struct super_block
*sb
, ext4_group_t grp
,
3209 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3210 struct ext4_group_desc
*gdp
;
3211 ext4_fsblk_t first_block
, last_block
, b
;
3212 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3213 int s
, j
, count
= 0;
3215 if (!ext4_has_feature_bigalloc(sb
))
3216 return (ext4_bg_has_super(sb
, grp
) + ext4_bg_num_gdb(sb
, grp
) +
3217 sbi
->s_itb_per_group
+ 2);
3219 first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
) +
3220 (grp
* EXT4_BLOCKS_PER_GROUP(sb
));
3221 last_block
= first_block
+ EXT4_BLOCKS_PER_GROUP(sb
) - 1;
3222 for (i
= 0; i
< ngroups
; i
++) {
3223 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
3224 b
= ext4_block_bitmap(sb
, gdp
);
3225 if (b
>= first_block
&& b
<= last_block
) {
3226 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3229 b
= ext4_inode_bitmap(sb
, gdp
);
3230 if (b
>= first_block
&& b
<= last_block
) {
3231 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3234 b
= ext4_inode_table(sb
, gdp
);
3235 if (b
>= first_block
&& b
+ sbi
->s_itb_per_group
<= last_block
)
3236 for (j
= 0; j
< sbi
->s_itb_per_group
; j
++, b
++) {
3237 int c
= EXT4_B2C(sbi
, b
- first_block
);
3238 ext4_set_bit(c
, buf
);
3244 if (ext4_bg_has_super(sb
, grp
)) {
3245 ext4_set_bit(s
++, buf
);
3248 j
= ext4_bg_num_gdb(sb
, grp
);
3249 if (s
+ j
> EXT4_BLOCKS_PER_GROUP(sb
)) {
3250 ext4_error(sb
, "Invalid number of block group "
3251 "descriptor blocks: %d", j
);
3252 j
= EXT4_BLOCKS_PER_GROUP(sb
) - s
;
3256 ext4_set_bit(EXT4_B2C(sbi
, s
++), buf
);
3260 return EXT4_CLUSTERS_PER_GROUP(sb
) -
3261 ext4_count_free(buf
, EXT4_CLUSTERS_PER_GROUP(sb
) / 8);
3265 * Compute the overhead and stash it in sbi->s_overhead
3267 int ext4_calculate_overhead(struct super_block
*sb
)
3269 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3270 struct ext4_super_block
*es
= sbi
->s_es
;
3271 struct inode
*j_inode
;
3272 unsigned int j_blocks
, j_inum
= le32_to_cpu(es
->s_journal_inum
);
3273 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3274 ext4_fsblk_t overhead
= 0;
3275 char *buf
= (char *) get_zeroed_page(GFP_NOFS
);
3281 * Compute the overhead (FS structures). This is constant
3282 * for a given filesystem unless the number of block groups
3283 * changes so we cache the previous value until it does.
3287 * All of the blocks before first_data_block are overhead
3289 overhead
= EXT4_B2C(sbi
, le32_to_cpu(es
->s_first_data_block
));
3292 * Add the overhead found in each block group
3294 for (i
= 0; i
< ngroups
; i
++) {
3297 blks
= count_overhead(sb
, i
, buf
);
3300 memset(buf
, 0, PAGE_SIZE
);
3305 * Add the internal journal blocks whether the journal has been
3308 if (sbi
->s_journal
&& !sbi
->journal_bdev
)
3309 overhead
+= EXT4_NUM_B2C(sbi
, sbi
->s_journal
->j_maxlen
);
3310 else if (ext4_has_feature_journal(sb
) && !sbi
->s_journal
) {
3311 j_inode
= ext4_get_journal_inode(sb
, j_inum
);
3313 j_blocks
= j_inode
->i_size
>> sb
->s_blocksize_bits
;
3314 overhead
+= EXT4_NUM_B2C(sbi
, j_blocks
);
3317 ext4_msg(sb
, KERN_ERR
, "can't get journal size");
3320 sbi
->s_overhead
= overhead
;
3322 free_page((unsigned long) buf
);
3326 static void ext4_set_resv_clusters(struct super_block
*sb
)
3328 ext4_fsblk_t resv_clusters
;
3329 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3332 * There's no need to reserve anything when we aren't using extents.
3333 * The space estimates are exact, there are no unwritten extents,
3334 * hole punching doesn't need new metadata... This is needed especially
3335 * to keep ext2/3 backward compatibility.
3337 if (!ext4_has_feature_extents(sb
))
3340 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3341 * This should cover the situations where we can not afford to run
3342 * out of space like for example punch hole, or converting
3343 * unwritten extents in delalloc path. In most cases such
3344 * allocation would require 1, or 2 blocks, higher numbers are
3347 resv_clusters
= (ext4_blocks_count(sbi
->s_es
) >>
3348 sbi
->s_cluster_bits
);
3350 do_div(resv_clusters
, 50);
3351 resv_clusters
= min_t(ext4_fsblk_t
, resv_clusters
, 4096);
3353 atomic64_set(&sbi
->s_resv_clusters
, resv_clusters
);
3356 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
3358 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
3359 struct buffer_head
*bh
;
3360 struct ext4_super_block
*es
= NULL
;
3361 struct ext4_sb_info
*sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
3363 ext4_fsblk_t sb_block
= get_sb_block(&data
);
3364 ext4_fsblk_t logical_sb_block
;
3365 unsigned long offset
= 0;
3366 unsigned long journal_devnum
= 0;
3367 unsigned long def_mount_opts
;
3371 int blocksize
, clustersize
;
3372 unsigned int db_count
;
3374 int needs_recovery
, has_huge_files
, has_bigalloc
;
3377 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3378 ext4_group_t first_not_zeroed
;
3380 if ((data
&& !orig_data
) || !sbi
)
3383 sbi
->s_blockgroup_lock
=
3384 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
3385 if (!sbi
->s_blockgroup_lock
)
3388 sb
->s_fs_info
= sbi
;
3390 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
3391 sbi
->s_sb_block
= sb_block
;
3392 if (sb
->s_bdev
->bd_part
)
3393 sbi
->s_sectors_written_start
=
3394 part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]);
3396 /* Cleanup superblock name */
3397 strreplace(sb
->s_id
, '/', '!');
3399 /* -EINVAL is default */
3401 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
3403 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
3408 * The ext4 superblock will not be buffer aligned for other than 1kB
3409 * block sizes. We need to calculate the offset from buffer start.
3411 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
3412 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3413 offset
= do_div(logical_sb_block
, blocksize
);
3415 logical_sb_block
= sb_block
;
3418 if (!(bh
= sb_bread_unmovable(sb
, logical_sb_block
))) {
3419 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
3423 * Note: s_es must be initialized as soon as possible because
3424 * some ext4 macro-instructions depend on its value
3426 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
3428 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
3429 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
3431 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
3433 /* Warn if metadata_csum and gdt_csum are both set. */
3434 if (ext4_has_feature_metadata_csum(sb
) &&
3435 ext4_has_feature_gdt_csum(sb
))
3436 ext4_warning(sb
, "metadata_csum and uninit_bg are "
3437 "redundant flags; please run fsck.");
3439 /* Check for a known checksum algorithm */
3440 if (!ext4_verify_csum_type(sb
, es
)) {
3441 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3442 "unknown checksum algorithm.");
3447 /* Load the checksum driver */
3448 if (ext4_has_feature_metadata_csum(sb
)) {
3449 sbi
->s_chksum_driver
= crypto_alloc_shash("crc32c", 0, 0);
3450 if (IS_ERR(sbi
->s_chksum_driver
)) {
3451 ext4_msg(sb
, KERN_ERR
, "Cannot load crc32c driver.");
3452 ret
= PTR_ERR(sbi
->s_chksum_driver
);
3453 sbi
->s_chksum_driver
= NULL
;
3458 /* Check superblock checksum */
3459 if (!ext4_superblock_csum_verify(sb
, es
)) {
3460 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3461 "invalid superblock checksum. Run e2fsck?");
3467 /* Precompute checksum seed for all metadata */
3468 if (ext4_has_feature_csum_seed(sb
))
3469 sbi
->s_csum_seed
= le32_to_cpu(es
->s_checksum_seed
);
3470 else if (ext4_has_metadata_csum(sb
))
3471 sbi
->s_csum_seed
= ext4_chksum(sbi
, ~0, es
->s_uuid
,
3472 sizeof(es
->s_uuid
));
3474 /* Set defaults before we parse the mount options */
3475 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
3476 set_opt(sb
, INIT_INODE_TABLE
);
3477 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
3479 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
3481 if (def_mount_opts
& EXT4_DEFM_UID16
)
3482 set_opt(sb
, NO_UID32
);
3483 /* xattr user namespace & acls are now defaulted on */
3484 set_opt(sb
, XATTR_USER
);
3485 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3486 set_opt(sb
, POSIX_ACL
);
3488 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3489 if (ext4_has_metadata_csum(sb
))
3490 set_opt(sb
, JOURNAL_CHECKSUM
);
3492 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
3493 set_opt(sb
, JOURNAL_DATA
);
3494 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
3495 set_opt(sb
, ORDERED_DATA
);
3496 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
3497 set_opt(sb
, WRITEBACK_DATA
);
3499 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
3500 set_opt(sb
, ERRORS_PANIC
);
3501 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
3502 set_opt(sb
, ERRORS_CONT
);
3504 set_opt(sb
, ERRORS_RO
);
3505 /* block_validity enabled by default; disable with noblock_validity */
3506 set_opt(sb
, BLOCK_VALIDITY
);
3507 if (def_mount_opts
& EXT4_DEFM_DISCARD
)
3508 set_opt(sb
, DISCARD
);
3510 sbi
->s_resuid
= make_kuid(&init_user_ns
, le16_to_cpu(es
->s_def_resuid
));
3511 sbi
->s_resgid
= make_kgid(&init_user_ns
, le16_to_cpu(es
->s_def_resgid
));
3512 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
3513 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
3514 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
3516 if ((def_mount_opts
& EXT4_DEFM_NOBARRIER
) == 0)
3517 set_opt(sb
, BARRIER
);
3520 * enable delayed allocation by default
3521 * Use -o nodelalloc to turn it off
3523 if (!IS_EXT3_SB(sb
) && !IS_EXT2_SB(sb
) &&
3524 ((def_mount_opts
& EXT4_DEFM_NODELALLOC
) == 0))
3525 set_opt(sb
, DELALLOC
);
3528 * set default s_li_wait_mult for lazyinit, for the case there is
3529 * no mount option specified.
3531 sbi
->s_li_wait_mult
= EXT4_DEF_LI_WAIT_MULT
;
3533 if (sbi
->s_es
->s_mount_opts
[0]) {
3534 char *s_mount_opts
= kstrndup(sbi
->s_es
->s_mount_opts
,
3535 sizeof(sbi
->s_es
->s_mount_opts
),
3539 if (!parse_options(s_mount_opts
, sb
, &journal_devnum
,
3540 &journal_ioprio
, 0)) {
3541 ext4_msg(sb
, KERN_WARNING
,
3542 "failed to parse options in superblock: %s",
3545 kfree(s_mount_opts
);
3547 sbi
->s_def_mount_opt
= sbi
->s_mount_opt
;
3548 if (!parse_options((char *) data
, sb
, &journal_devnum
,
3549 &journal_ioprio
, 0))
3552 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
3553 printk_once(KERN_WARNING
"EXT4-fs: Warning: mounting "
3554 "with data=journal disables delayed "
3555 "allocation and O_DIRECT support!\n");
3556 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
3557 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3558 "both data=journal and delalloc");
3561 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
3562 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3563 "both data=journal and dioread_nolock");
3566 if (test_opt(sb
, DAX
)) {
3567 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3568 "both data=journal and dax");
3571 if (ext4_has_feature_encrypt(sb
)) {
3572 ext4_msg(sb
, KERN_WARNING
,
3573 "encrypted files will use data=ordered "
3574 "instead of data journaling mode");
3576 if (test_opt(sb
, DELALLOC
))
3577 clear_opt(sb
, DELALLOC
);
3579 sb
->s_iflags
|= SB_I_CGROUPWB
;
3582 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3583 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
3585 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
3586 (ext4_has_compat_features(sb
) ||
3587 ext4_has_ro_compat_features(sb
) ||
3588 ext4_has_incompat_features(sb
)))
3589 ext4_msg(sb
, KERN_WARNING
,
3590 "feature flags set on rev 0 fs, "
3591 "running e2fsck is recommended");
3593 if (es
->s_creator_os
== cpu_to_le32(EXT4_OS_HURD
)) {
3594 set_opt2(sb
, HURD_COMPAT
);
3595 if (ext4_has_feature_64bit(sb
)) {
3596 ext4_msg(sb
, KERN_ERR
,
3597 "The Hurd can't support 64-bit file systems");
3602 if (IS_EXT2_SB(sb
)) {
3603 if (ext2_feature_set_ok(sb
))
3604 ext4_msg(sb
, KERN_INFO
, "mounting ext2 file system "
3605 "using the ext4 subsystem");
3607 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext2 due "
3608 "to feature incompatibilities");
3613 if (IS_EXT3_SB(sb
)) {
3614 if (ext3_feature_set_ok(sb
))
3615 ext4_msg(sb
, KERN_INFO
, "mounting ext3 file system "
3616 "using the ext4 subsystem");
3618 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext3 due "
3619 "to feature incompatibilities");
3625 * Check feature flags regardless of the revision level, since we
3626 * previously didn't change the revision level when setting the flags,
3627 * so there is a chance incompat flags are set on a rev 0 filesystem.
3629 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
3632 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
3633 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
3634 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
3635 ext4_msg(sb
, KERN_ERR
,
3636 "Unsupported filesystem blocksize %d (%d log_block_size)",
3637 blocksize
, le32_to_cpu(es
->s_log_block_size
));
3640 if (le32_to_cpu(es
->s_log_block_size
) >
3641 (EXT4_MAX_BLOCK_LOG_SIZE
- EXT4_MIN_BLOCK_LOG_SIZE
)) {
3642 ext4_msg(sb
, KERN_ERR
,
3643 "Invalid log block size: %u",
3644 le32_to_cpu(es
->s_log_block_size
));
3648 if (le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
) > (blocksize
/ 4)) {
3649 ext4_msg(sb
, KERN_ERR
,
3650 "Number of reserved GDT blocks insanely large: %d",
3651 le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
));
3655 if (sbi
->s_mount_opt
& EXT4_MOUNT_DAX
) {
3656 err
= bdev_dax_supported(sb
, blocksize
);
3661 if (ext4_has_feature_encrypt(sb
) && es
->s_encryption_level
) {
3662 ext4_msg(sb
, KERN_ERR
, "Unsupported encryption level %d",
3663 es
->s_encryption_level
);
3667 if (sb
->s_blocksize
!= blocksize
) {
3668 /* Validate the filesystem blocksize */
3669 if (!sb_set_blocksize(sb
, blocksize
)) {
3670 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
3676 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3677 offset
= do_div(logical_sb_block
, blocksize
);
3678 bh
= sb_bread_unmovable(sb
, logical_sb_block
);
3680 ext4_msg(sb
, KERN_ERR
,
3681 "Can't read superblock on 2nd try");
3684 es
= (struct ext4_super_block
*)(bh
->b_data
+ offset
);
3686 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
3687 ext4_msg(sb
, KERN_ERR
,
3688 "Magic mismatch, very weird!");
3693 has_huge_files
= ext4_has_feature_huge_file(sb
);
3694 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
3696 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
3698 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
3699 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
3700 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
3702 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
3703 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
3704 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
3705 (!is_power_of_2(sbi
->s_inode_size
)) ||
3706 (sbi
->s_inode_size
> blocksize
)) {
3707 ext4_msg(sb
, KERN_ERR
,
3708 "unsupported inode size: %d",
3712 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
3713 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
3716 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
3717 if (ext4_has_feature_64bit(sb
)) {
3718 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
3719 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
3720 !is_power_of_2(sbi
->s_desc_size
)) {
3721 ext4_msg(sb
, KERN_ERR
,
3722 "unsupported descriptor size %lu",
3727 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
3729 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
3730 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
3732 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
3733 if (sbi
->s_inodes_per_block
== 0)
3735 if (sbi
->s_inodes_per_group
< sbi
->s_inodes_per_block
||
3736 sbi
->s_inodes_per_group
> blocksize
* 8) {
3737 ext4_msg(sb
, KERN_ERR
, "invalid inodes per group: %lu\n",
3738 sbi
->s_blocks_per_group
);
3741 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
3742 sbi
->s_inodes_per_block
;
3743 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
3745 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3746 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
3747 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
3749 for (i
= 0; i
< 4; i
++)
3750 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
3751 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
3752 if (ext4_has_feature_dir_index(sb
)) {
3753 i
= le32_to_cpu(es
->s_flags
);
3754 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
3755 sbi
->s_hash_unsigned
= 3;
3756 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
3757 #ifdef __CHAR_UNSIGNED__
3758 if (!(sb
->s_flags
& MS_RDONLY
))
3760 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
3761 sbi
->s_hash_unsigned
= 3;
3763 if (!(sb
->s_flags
& MS_RDONLY
))
3765 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
3770 /* Handle clustersize */
3771 clustersize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_cluster_size
);
3772 has_bigalloc
= ext4_has_feature_bigalloc(sb
);
3774 if (clustersize
< blocksize
) {
3775 ext4_msg(sb
, KERN_ERR
,
3776 "cluster size (%d) smaller than "
3777 "block size (%d)", clustersize
, blocksize
);
3780 if (le32_to_cpu(es
->s_log_cluster_size
) >
3781 (EXT4_MAX_CLUSTER_LOG_SIZE
- EXT4_MIN_BLOCK_LOG_SIZE
)) {
3782 ext4_msg(sb
, KERN_ERR
,
3783 "Invalid log cluster size: %u",
3784 le32_to_cpu(es
->s_log_cluster_size
));
3787 sbi
->s_cluster_bits
= le32_to_cpu(es
->s_log_cluster_size
) -
3788 le32_to_cpu(es
->s_log_block_size
);
3789 sbi
->s_clusters_per_group
=
3790 le32_to_cpu(es
->s_clusters_per_group
);
3791 if (sbi
->s_clusters_per_group
> blocksize
* 8) {
3792 ext4_msg(sb
, KERN_ERR
,
3793 "#clusters per group too big: %lu",
3794 sbi
->s_clusters_per_group
);
3797 if (sbi
->s_blocks_per_group
!=
3798 (sbi
->s_clusters_per_group
* (clustersize
/ blocksize
))) {
3799 ext4_msg(sb
, KERN_ERR
, "blocks per group (%lu) and "
3800 "clusters per group (%lu) inconsistent",
3801 sbi
->s_blocks_per_group
,
3802 sbi
->s_clusters_per_group
);
3806 if (clustersize
!= blocksize
) {
3807 ext4_warning(sb
, "fragment/cluster size (%d) != "
3808 "block size (%d)", clustersize
,
3810 clustersize
= blocksize
;
3812 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
3813 ext4_msg(sb
, KERN_ERR
,
3814 "#blocks per group too big: %lu",
3815 sbi
->s_blocks_per_group
);
3818 sbi
->s_clusters_per_group
= sbi
->s_blocks_per_group
;
3819 sbi
->s_cluster_bits
= 0;
3821 sbi
->s_cluster_ratio
= clustersize
/ blocksize
;
3823 /* Do we have standard group size of clustersize * 8 blocks ? */
3824 if (sbi
->s_blocks_per_group
== clustersize
<< 3)
3825 set_opt2(sb
, STD_GROUP_SIZE
);
3828 * Test whether we have more sectors than will fit in sector_t,
3829 * and whether the max offset is addressable by the page cache.
3831 err
= generic_check_addressable(sb
->s_blocksize_bits
,
3832 ext4_blocks_count(es
));
3834 ext4_msg(sb
, KERN_ERR
, "filesystem"
3835 " too large to mount safely on this system");
3836 if (sizeof(sector_t
) < 8)
3837 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
3841 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
3844 /* check blocks count against device size */
3845 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
3846 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
3847 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
3848 "exceeds size of device (%llu blocks)",
3849 ext4_blocks_count(es
), blocks_count
);
3854 * It makes no sense for the first data block to be beyond the end
3855 * of the filesystem.
3857 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
3858 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data "
3859 "block %u is beyond end of filesystem (%llu)",
3860 le32_to_cpu(es
->s_first_data_block
),
3861 ext4_blocks_count(es
));
3864 blocks_count
= (ext4_blocks_count(es
) -
3865 le32_to_cpu(es
->s_first_data_block
) +
3866 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
3867 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
3868 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
3869 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
3870 "(block count %llu, first data block %u, "
3871 "blocks per group %lu)", sbi
->s_groups_count
,
3872 ext4_blocks_count(es
),
3873 le32_to_cpu(es
->s_first_data_block
),
3874 EXT4_BLOCKS_PER_GROUP(sb
));
3877 sbi
->s_groups_count
= blocks_count
;
3878 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
3879 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
3880 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
3881 EXT4_DESC_PER_BLOCK(sb
);
3882 if (ext4_has_feature_meta_bg(sb
)) {
3883 if (le32_to_cpu(es
->s_first_meta_bg
) > db_count
) {
3884 ext4_msg(sb
, KERN_WARNING
,
3885 "first meta block group too large: %u "
3886 "(group descriptor block count %u)",
3887 le32_to_cpu(es
->s_first_meta_bg
), db_count
);
3891 sbi
->s_group_desc
= kvmalloc(db_count
*
3892 sizeof(struct buffer_head
*),
3894 if (sbi
->s_group_desc
== NULL
) {
3895 ext4_msg(sb
, KERN_ERR
, "not enough memory");
3900 bgl_lock_init(sbi
->s_blockgroup_lock
);
3902 /* Pre-read the descriptors into the buffer cache */
3903 for (i
= 0; i
< db_count
; i
++) {
3904 block
= descriptor_loc(sb
, logical_sb_block
, i
);
3905 sb_breadahead(sb
, block
);
3908 for (i
= 0; i
< db_count
; i
++) {
3909 block
= descriptor_loc(sb
, logical_sb_block
, i
);
3910 sbi
->s_group_desc
[i
] = sb_bread_unmovable(sb
, block
);
3911 if (!sbi
->s_group_desc
[i
]) {
3912 ext4_msg(sb
, KERN_ERR
,
3913 "can't read group descriptor %d", i
);
3918 if (!ext4_check_descriptors(sb
, logical_sb_block
, &first_not_zeroed
)) {
3919 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
3920 ret
= -EFSCORRUPTED
;
3924 sbi
->s_gdb_count
= db_count
;
3925 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
3926 spin_lock_init(&sbi
->s_next_gen_lock
);
3928 setup_timer(&sbi
->s_err_report
, print_daily_error_info
,
3929 (unsigned long) sb
);
3931 /* Register extent status tree shrinker */
3932 if (ext4_es_register_shrinker(sbi
))
3935 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
3936 sbi
->s_extent_max_zeroout_kb
= 32;
3939 * set up enough so that it can read an inode
3941 sb
->s_op
= &ext4_sops
;
3942 sb
->s_export_op
= &ext4_export_ops
;
3943 sb
->s_xattr
= ext4_xattr_handlers
;
3944 sb
->s_cop
= &ext4_cryptops
;
3946 sb
->dq_op
= &ext4_quota_operations
;
3947 if (ext4_has_feature_quota(sb
))
3948 sb
->s_qcop
= &dquot_quotactl_sysfile_ops
;
3950 sb
->s_qcop
= &ext4_qctl_operations
;
3951 sb
->s_quota_types
= QTYPE_MASK_USR
| QTYPE_MASK_GRP
| QTYPE_MASK_PRJ
;
3953 memcpy(&sb
->s_uuid
, es
->s_uuid
, sizeof(es
->s_uuid
));
3955 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
3956 mutex_init(&sbi
->s_orphan_lock
);
3960 needs_recovery
= (es
->s_last_orphan
!= 0 ||
3961 ext4_has_feature_journal_needs_recovery(sb
));
3963 if (ext4_has_feature_mmp(sb
) && !(sb
->s_flags
& MS_RDONLY
))
3964 if (ext4_multi_mount_protect(sb
, le64_to_cpu(es
->s_mmp_block
)))
3965 goto failed_mount3a
;
3968 * The first inode we look at is the journal inode. Don't try
3969 * root first: it may be modified in the journal!
3971 if (!test_opt(sb
, NOLOAD
) && ext4_has_feature_journal(sb
)) {
3972 err
= ext4_load_journal(sb
, es
, journal_devnum
);
3974 goto failed_mount3a
;
3975 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
3976 ext4_has_feature_journal_needs_recovery(sb
)) {
3977 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
3978 "suppressed and not mounted read-only");
3979 goto failed_mount_wq
;
3981 /* Nojournal mode, all journal mount options are illegal */
3982 if (test_opt2(sb
, EXPLICIT_JOURNAL_CHECKSUM
)) {
3983 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3984 "journal_checksum, fs mounted w/o journal");
3985 goto failed_mount_wq
;
3987 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
3988 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3989 "journal_async_commit, fs mounted w/o journal");
3990 goto failed_mount_wq
;
3992 if (sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
) {
3993 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3994 "commit=%lu, fs mounted w/o journal",
3995 sbi
->s_commit_interval
/ HZ
);
3996 goto failed_mount_wq
;
3998 if (EXT4_MOUNT_DATA_FLAGS
&
3999 (sbi
->s_mount_opt
^ sbi
->s_def_mount_opt
)) {
4000 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4001 "data=, fs mounted w/o journal");
4002 goto failed_mount_wq
;
4004 sbi
->s_def_mount_opt
&= EXT4_MOUNT_JOURNAL_CHECKSUM
;
4005 clear_opt(sb
, JOURNAL_CHECKSUM
);
4006 clear_opt(sb
, DATA_FLAGS
);
4007 sbi
->s_journal
= NULL
;
4012 if (ext4_has_feature_64bit(sb
) &&
4013 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
4014 JBD2_FEATURE_INCOMPAT_64BIT
)) {
4015 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
4016 goto failed_mount_wq
;
4019 if (!set_journal_csum_feature_set(sb
)) {
4020 ext4_msg(sb
, KERN_ERR
, "Failed to set journal checksum "
4022 goto failed_mount_wq
;
4025 /* We have now updated the journal if required, so we can
4026 * validate the data journaling mode. */
4027 switch (test_opt(sb
, DATA_FLAGS
)) {
4029 /* No mode set, assume a default based on the journal
4030 * capabilities: ORDERED_DATA if the journal can
4031 * cope, else JOURNAL_DATA
4033 if (jbd2_journal_check_available_features
4034 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
4035 set_opt(sb
, ORDERED_DATA
);
4037 set_opt(sb
, JOURNAL_DATA
);
4040 case EXT4_MOUNT_ORDERED_DATA
:
4041 case EXT4_MOUNT_WRITEBACK_DATA
:
4042 if (!jbd2_journal_check_available_features
4043 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
4044 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
4045 "requested data journaling mode");
4046 goto failed_mount_wq
;
4052 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
&&
4053 test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
4054 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4055 "journal_async_commit in data=ordered mode");
4056 goto failed_mount_wq
;
4059 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
4061 sbi
->s_journal
->j_commit_callback
= ext4_journal_commit_callback
;
4064 sbi
->s_mb_cache
= ext4_xattr_create_cache();
4065 if (!sbi
->s_mb_cache
) {
4066 ext4_msg(sb
, KERN_ERR
, "Failed to create an mb_cache");
4067 goto failed_mount_wq
;
4070 if ((DUMMY_ENCRYPTION_ENABLED(sbi
) || ext4_has_feature_encrypt(sb
)) &&
4071 (blocksize
!= PAGE_SIZE
)) {
4072 ext4_msg(sb
, KERN_ERR
,
4073 "Unsupported blocksize for fs encryption");
4074 goto failed_mount_wq
;
4077 if (DUMMY_ENCRYPTION_ENABLED(sbi
) && !(sb
->s_flags
& MS_RDONLY
) &&
4078 !ext4_has_feature_encrypt(sb
)) {
4079 ext4_set_feature_encrypt(sb
);
4080 ext4_commit_super(sb
, 1);
4084 * Get the # of file system overhead blocks from the
4085 * superblock if present.
4087 if (es
->s_overhead_clusters
)
4088 sbi
->s_overhead
= le32_to_cpu(es
->s_overhead_clusters
);
4090 err
= ext4_calculate_overhead(sb
);
4092 goto failed_mount_wq
;
4096 * The maximum number of concurrent works can be high and
4097 * concurrency isn't really necessary. Limit it to 1.
4099 EXT4_SB(sb
)->rsv_conversion_wq
=
4100 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM
| WQ_UNBOUND
, 1);
4101 if (!EXT4_SB(sb
)->rsv_conversion_wq
) {
4102 printk(KERN_ERR
"EXT4-fs: failed to create workqueue\n");
4108 * The jbd2_journal_load will have done any necessary log recovery,
4109 * so we can safely mount the rest of the filesystem now.
4112 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
4114 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
4115 ret
= PTR_ERR(root
);
4119 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
4120 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
4124 sb
->s_root
= d_make_root(root
);
4126 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
4131 if (ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
))
4132 sb
->s_flags
|= MS_RDONLY
;
4134 /* determine the minimum size of new large inodes, if present */
4135 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
&&
4136 sbi
->s_want_extra_isize
== 0) {
4137 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
4138 EXT4_GOOD_OLD_INODE_SIZE
;
4139 if (ext4_has_feature_extra_isize(sb
)) {
4140 if (sbi
->s_want_extra_isize
<
4141 le16_to_cpu(es
->s_want_extra_isize
))
4142 sbi
->s_want_extra_isize
=
4143 le16_to_cpu(es
->s_want_extra_isize
);
4144 if (sbi
->s_want_extra_isize
<
4145 le16_to_cpu(es
->s_min_extra_isize
))
4146 sbi
->s_want_extra_isize
=
4147 le16_to_cpu(es
->s_min_extra_isize
);
4150 /* Check if enough inode space is available */
4151 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
4152 sbi
->s_inode_size
) {
4153 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
4154 EXT4_GOOD_OLD_INODE_SIZE
;
4155 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
4159 ext4_set_resv_clusters(sb
);
4161 err
= ext4_setup_system_zone(sb
);
4163 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
4165 goto failed_mount4a
;
4169 err
= ext4_mb_init(sb
);
4171 ext4_msg(sb
, KERN_ERR
, "failed to initialize mballoc (%d)",
4176 block
= ext4_count_free_clusters(sb
);
4177 ext4_free_blocks_count_set(sbi
->s_es
,
4178 EXT4_C2B(sbi
, block
));
4179 err
= percpu_counter_init(&sbi
->s_freeclusters_counter
, block
,
4182 unsigned long freei
= ext4_count_free_inodes(sb
);
4183 sbi
->s_es
->s_free_inodes_count
= cpu_to_le32(freei
);
4184 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
, freei
,
4188 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
4189 ext4_count_dirs(sb
), GFP_KERNEL
);
4191 err
= percpu_counter_init(&sbi
->s_dirtyclusters_counter
, 0,
4194 err
= percpu_init_rwsem(&sbi
->s_journal_flag_rwsem
);
4197 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
4201 if (ext4_has_feature_flex_bg(sb
))
4202 if (!ext4_fill_flex_info(sb
)) {
4203 ext4_msg(sb
, KERN_ERR
,
4204 "unable to initialize "
4205 "flex_bg meta info!");
4209 err
= ext4_register_li_request(sb
, first_not_zeroed
);
4213 err
= ext4_register_sysfs(sb
);
4218 /* Enable quota usage during mount. */
4219 if (ext4_has_feature_quota(sb
) && !(sb
->s_flags
& MS_RDONLY
)) {
4220 err
= ext4_enable_quotas(sb
);
4224 #endif /* CONFIG_QUOTA */
4226 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
4227 ext4_orphan_cleanup(sb
, es
);
4228 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
4229 if (needs_recovery
) {
4230 ext4_msg(sb
, KERN_INFO
, "recovery complete");
4231 ext4_mark_recovery_complete(sb
, es
);
4233 if (EXT4_SB(sb
)->s_journal
) {
4234 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
4235 descr
= " journalled data mode";
4236 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
4237 descr
= " ordered data mode";
4239 descr
= " writeback data mode";
4241 descr
= "out journal";
4243 if (test_opt(sb
, DISCARD
)) {
4244 struct request_queue
*q
= bdev_get_queue(sb
->s_bdev
);
4245 if (!blk_queue_discard(q
))
4246 ext4_msg(sb
, KERN_WARNING
,
4247 "mounting with \"discard\" option, but "
4248 "the device does not support discard");
4251 if (___ratelimit(&ext4_mount_msg_ratelimit
, "EXT4-fs mount"))
4252 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s. "
4253 "Opts: %.*s%s%s", descr
,
4254 (int) sizeof(sbi
->s_es
->s_mount_opts
),
4255 sbi
->s_es
->s_mount_opts
,
4256 *sbi
->s_es
->s_mount_opts
? "; " : "", orig_data
);
4258 if (es
->s_error_count
)
4259 mod_timer(&sbi
->s_err_report
, jiffies
+ 300*HZ
); /* 5 minutes */
4261 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4262 ratelimit_state_init(&sbi
->s_err_ratelimit_state
, 5 * HZ
, 10);
4263 ratelimit_state_init(&sbi
->s_warning_ratelimit_state
, 5 * HZ
, 10);
4264 ratelimit_state_init(&sbi
->s_msg_ratelimit_state
, 5 * HZ
, 10);
4271 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
4276 ext4_unregister_sysfs(sb
);
4279 ext4_unregister_li_request(sb
);
4281 ext4_mb_release(sb
);
4282 if (sbi
->s_flex_groups
)
4283 kvfree(sbi
->s_flex_groups
);
4284 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
4285 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
4286 percpu_counter_destroy(&sbi
->s_dirs_counter
);
4287 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
4289 ext4_ext_release(sb
);
4290 ext4_release_system_zone(sb
);
4295 ext4_msg(sb
, KERN_ERR
, "mount failed");
4296 if (EXT4_SB(sb
)->rsv_conversion_wq
)
4297 destroy_workqueue(EXT4_SB(sb
)->rsv_conversion_wq
);
4299 if (sbi
->s_mb_cache
) {
4300 ext4_xattr_destroy_cache(sbi
->s_mb_cache
);
4301 sbi
->s_mb_cache
= NULL
;
4303 if (sbi
->s_journal
) {
4304 jbd2_journal_destroy(sbi
->s_journal
);
4305 sbi
->s_journal
= NULL
;
4308 ext4_es_unregister_shrinker(sbi
);
4310 del_timer_sync(&sbi
->s_err_report
);
4312 kthread_stop(sbi
->s_mmp_tsk
);
4314 for (i
= 0; i
< db_count
; i
++)
4315 brelse(sbi
->s_group_desc
[i
]);
4316 kvfree(sbi
->s_group_desc
);
4318 if (sbi
->s_chksum_driver
)
4319 crypto_free_shash(sbi
->s_chksum_driver
);
4321 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
4322 kfree(sbi
->s_qf_names
[i
]);
4324 ext4_blkdev_remove(sbi
);
4327 sb
->s_fs_info
= NULL
;
4328 kfree(sbi
->s_blockgroup_lock
);
4332 return err
? err
: ret
;
4336 * Setup any per-fs journal parameters now. We'll do this both on
4337 * initial mount, once the journal has been initialised but before we've
4338 * done any recovery; and again on any subsequent remount.
4340 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
4342 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4344 journal
->j_commit_interval
= sbi
->s_commit_interval
;
4345 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
4346 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
4348 write_lock(&journal
->j_state_lock
);
4349 if (test_opt(sb
, BARRIER
))
4350 journal
->j_flags
|= JBD2_BARRIER
;
4352 journal
->j_flags
&= ~JBD2_BARRIER
;
4353 if (test_opt(sb
, DATA_ERR_ABORT
))
4354 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
4356 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
4357 write_unlock(&journal
->j_state_lock
);
4360 static struct inode
*ext4_get_journal_inode(struct super_block
*sb
,
4361 unsigned int journal_inum
)
4363 struct inode
*journal_inode
;
4366 * Test for the existence of a valid inode on disk. Bad things
4367 * happen if we iget() an unused inode, as the subsequent iput()
4368 * will try to delete it.
4370 journal_inode
= ext4_iget(sb
, journal_inum
);
4371 if (IS_ERR(journal_inode
)) {
4372 ext4_msg(sb
, KERN_ERR
, "no journal found");
4375 if (!journal_inode
->i_nlink
) {
4376 make_bad_inode(journal_inode
);
4377 iput(journal_inode
);
4378 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
4382 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4383 journal_inode
, journal_inode
->i_size
);
4384 if (!S_ISREG(journal_inode
->i_mode
)) {
4385 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
4386 iput(journal_inode
);
4389 return journal_inode
;
4392 static journal_t
*ext4_get_journal(struct super_block
*sb
,
4393 unsigned int journal_inum
)
4395 struct inode
*journal_inode
;
4398 BUG_ON(!ext4_has_feature_journal(sb
));
4400 journal_inode
= ext4_get_journal_inode(sb
, journal_inum
);
4404 journal
= jbd2_journal_init_inode(journal_inode
);
4406 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
4407 iput(journal_inode
);
4410 journal
->j_private
= sb
;
4411 ext4_init_journal_params(sb
, journal
);
4415 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
4418 struct buffer_head
*bh
;
4422 int hblock
, blocksize
;
4423 ext4_fsblk_t sb_block
;
4424 unsigned long offset
;
4425 struct ext4_super_block
*es
;
4426 struct block_device
*bdev
;
4428 BUG_ON(!ext4_has_feature_journal(sb
));
4430 bdev
= ext4_blkdev_get(j_dev
, sb
);
4434 blocksize
= sb
->s_blocksize
;
4435 hblock
= bdev_logical_block_size(bdev
);
4436 if (blocksize
< hblock
) {
4437 ext4_msg(sb
, KERN_ERR
,
4438 "blocksize too small for journal device");
4442 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
4443 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
4444 set_blocksize(bdev
, blocksize
);
4445 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
4446 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
4447 "external journal");
4451 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
4452 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
4453 !(le32_to_cpu(es
->s_feature_incompat
) &
4454 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
4455 ext4_msg(sb
, KERN_ERR
, "external journal has "
4461 if ((le32_to_cpu(es
->s_feature_ro_compat
) &
4462 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
) &&
4463 es
->s_checksum
!= ext4_superblock_csum(sb
, es
)) {
4464 ext4_msg(sb
, KERN_ERR
, "external journal has "
4465 "corrupt superblock");
4470 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
4471 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
4476 len
= ext4_blocks_count(es
);
4477 start
= sb_block
+ 1;
4478 brelse(bh
); /* we're done with the superblock */
4480 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
4481 start
, len
, blocksize
);
4483 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
4486 journal
->j_private
= sb
;
4487 ll_rw_block(REQ_OP_READ
, REQ_META
| REQ_PRIO
, 1, &journal
->j_sb_buffer
);
4488 wait_on_buffer(journal
->j_sb_buffer
);
4489 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
4490 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
4493 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
4494 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
4495 "user (unsupported) - %d",
4496 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
4499 EXT4_SB(sb
)->journal_bdev
= bdev
;
4500 ext4_init_journal_params(sb
, journal
);
4504 jbd2_journal_destroy(journal
);
4506 ext4_blkdev_put(bdev
);
4510 static int ext4_load_journal(struct super_block
*sb
,
4511 struct ext4_super_block
*es
,
4512 unsigned long journal_devnum
)
4515 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
4518 int really_read_only
;
4520 BUG_ON(!ext4_has_feature_journal(sb
));
4522 if (journal_devnum
&&
4523 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4524 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
4525 "numbers have changed");
4526 journal_dev
= new_decode_dev(journal_devnum
);
4528 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
4530 really_read_only
= bdev_read_only(sb
->s_bdev
);
4533 * Are we loading a blank journal or performing recovery after a
4534 * crash? For recovery, we need to check in advance whether we
4535 * can get read-write access to the device.
4537 if (ext4_has_feature_journal_needs_recovery(sb
)) {
4538 if (sb
->s_flags
& MS_RDONLY
) {
4539 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
4540 "required on readonly filesystem");
4541 if (really_read_only
) {
4542 ext4_msg(sb
, KERN_ERR
, "write access "
4543 "unavailable, cannot proceed");
4546 ext4_msg(sb
, KERN_INFO
, "write access will "
4547 "be enabled during recovery");
4551 if (journal_inum
&& journal_dev
) {
4552 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
4553 "and inode journals!");
4558 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
4561 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
4565 if (!(journal
->j_flags
& JBD2_BARRIER
))
4566 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
4568 if (!ext4_has_feature_journal_needs_recovery(sb
))
4569 err
= jbd2_journal_wipe(journal
, !really_read_only
);
4571 char *save
= kmalloc(EXT4_S_ERR_LEN
, GFP_KERNEL
);
4573 memcpy(save
, ((char *) es
) +
4574 EXT4_S_ERR_START
, EXT4_S_ERR_LEN
);
4575 err
= jbd2_journal_load(journal
);
4577 memcpy(((char *) es
) + EXT4_S_ERR_START
,
4578 save
, EXT4_S_ERR_LEN
);
4583 ext4_msg(sb
, KERN_ERR
, "error loading journal");
4584 jbd2_journal_destroy(journal
);
4588 EXT4_SB(sb
)->s_journal
= journal
;
4589 ext4_clear_journal_err(sb
, es
);
4591 if (!really_read_only
&& journal_devnum
&&
4592 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4593 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
4595 /* Make sure we flush the recovery flag to disk. */
4596 ext4_commit_super(sb
, 1);
4602 static int ext4_commit_super(struct super_block
*sb
, int sync
)
4604 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
4605 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
4608 if (!sbh
|| block_device_ejected(sb
))
4611 * If the file system is mounted read-only, don't update the
4612 * superblock write time. This avoids updating the superblock
4613 * write time when we are mounting the root file system
4614 * read/only but we need to replay the journal; at that point,
4615 * for people who are east of GMT and who make their clock
4616 * tick in localtime for Windows bug-for-bug compatibility,
4617 * the clock is set in the future, and this will cause e2fsck
4618 * to complain and force a full file system check.
4620 if (!(sb
->s_flags
& MS_RDONLY
))
4621 es
->s_wtime
= cpu_to_le32(get_seconds());
4622 if (sb
->s_bdev
->bd_part
)
4623 es
->s_kbytes_written
=
4624 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
4625 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
4626 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
4628 es
->s_kbytes_written
=
4629 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
);
4630 if (percpu_counter_initialized(&EXT4_SB(sb
)->s_freeclusters_counter
))
4631 ext4_free_blocks_count_set(es
,
4632 EXT4_C2B(EXT4_SB(sb
), percpu_counter_sum_positive(
4633 &EXT4_SB(sb
)->s_freeclusters_counter
)));
4634 if (percpu_counter_initialized(&EXT4_SB(sb
)->s_freeinodes_counter
))
4635 es
->s_free_inodes_count
=
4636 cpu_to_le32(percpu_counter_sum_positive(
4637 &EXT4_SB(sb
)->s_freeinodes_counter
));
4638 BUFFER_TRACE(sbh
, "marking dirty");
4639 ext4_superblock_csum_set(sb
);
4642 if (buffer_write_io_error(sbh
)) {
4644 * Oh, dear. A previous attempt to write the
4645 * superblock failed. This could happen because the
4646 * USB device was yanked out. Or it could happen to
4647 * be a transient write error and maybe the block will
4648 * be remapped. Nothing we can do but to retry the
4649 * write and hope for the best.
4651 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
4652 "superblock detected");
4653 clear_buffer_write_io_error(sbh
);
4654 set_buffer_uptodate(sbh
);
4656 mark_buffer_dirty(sbh
);
4659 error
= __sync_dirty_buffer(sbh
,
4660 REQ_SYNC
| (test_opt(sb
, BARRIER
) ? REQ_FUA
: 0));
4664 error
= buffer_write_io_error(sbh
);
4666 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
4668 clear_buffer_write_io_error(sbh
);
4669 set_buffer_uptodate(sbh
);
4676 * Have we just finished recovery? If so, and if we are mounting (or
4677 * remounting) the filesystem readonly, then we will end up with a
4678 * consistent fs on disk. Record that fact.
4680 static void ext4_mark_recovery_complete(struct super_block
*sb
,
4681 struct ext4_super_block
*es
)
4683 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
4685 if (!ext4_has_feature_journal(sb
)) {
4686 BUG_ON(journal
!= NULL
);
4689 jbd2_journal_lock_updates(journal
);
4690 if (jbd2_journal_flush(journal
) < 0)
4693 if (ext4_has_feature_journal_needs_recovery(sb
) &&
4694 sb
->s_flags
& MS_RDONLY
) {
4695 ext4_clear_feature_journal_needs_recovery(sb
);
4696 ext4_commit_super(sb
, 1);
4700 jbd2_journal_unlock_updates(journal
);
4704 * If we are mounting (or read-write remounting) a filesystem whose journal
4705 * has recorded an error from a previous lifetime, move that error to the
4706 * main filesystem now.
4708 static void ext4_clear_journal_err(struct super_block
*sb
,
4709 struct ext4_super_block
*es
)
4715 BUG_ON(!ext4_has_feature_journal(sb
));
4717 journal
= EXT4_SB(sb
)->s_journal
;
4720 * Now check for any error status which may have been recorded in the
4721 * journal by a prior ext4_error() or ext4_abort()
4724 j_errno
= jbd2_journal_errno(journal
);
4728 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
4729 ext4_warning(sb
, "Filesystem error recorded "
4730 "from previous mount: %s", errstr
);
4731 ext4_warning(sb
, "Marking fs in need of filesystem check.");
4733 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
4734 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
4735 ext4_commit_super(sb
, 1);
4737 jbd2_journal_clear_err(journal
);
4738 jbd2_journal_update_sb_errno(journal
);
4743 * Force the running and committing transactions to commit,
4744 * and wait on the commit.
4746 int ext4_force_commit(struct super_block
*sb
)
4750 if (sb
->s_flags
& MS_RDONLY
)
4753 journal
= EXT4_SB(sb
)->s_journal
;
4754 return ext4_journal_force_commit(journal
);
4757 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
4761 bool needs_barrier
= false;
4762 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4764 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
4767 trace_ext4_sync_fs(sb
, wait
);
4768 flush_workqueue(sbi
->rsv_conversion_wq
);
4770 * Writeback quota in non-journalled quota case - journalled quota has
4773 dquot_writeback_dquots(sb
, -1);
4775 * Data writeback is possible w/o journal transaction, so barrier must
4776 * being sent at the end of the function. But we can skip it if
4777 * transaction_commit will do it for us.
4779 if (sbi
->s_journal
) {
4780 target
= jbd2_get_latest_transaction(sbi
->s_journal
);
4781 if (wait
&& sbi
->s_journal
->j_flags
& JBD2_BARRIER
&&
4782 !jbd2_trans_will_send_data_barrier(sbi
->s_journal
, target
))
4783 needs_barrier
= true;
4785 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
4787 ret
= jbd2_log_wait_commit(sbi
->s_journal
,
4790 } else if (wait
&& test_opt(sb
, BARRIER
))
4791 needs_barrier
= true;
4792 if (needs_barrier
) {
4794 err
= blkdev_issue_flush(sb
->s_bdev
, GFP_KERNEL
, NULL
);
4803 * LVM calls this function before a (read-only) snapshot is created. This
4804 * gives us a chance to flush the journal completely and mark the fs clean.
4806 * Note that only this function cannot bring a filesystem to be in a clean
4807 * state independently. It relies on upper layer to stop all data & metadata
4810 static int ext4_freeze(struct super_block
*sb
)
4815 if (sb
->s_flags
& MS_RDONLY
)
4818 journal
= EXT4_SB(sb
)->s_journal
;
4821 /* Now we set up the journal barrier. */
4822 jbd2_journal_lock_updates(journal
);
4825 * Don't clear the needs_recovery flag if we failed to
4826 * flush the journal.
4828 error
= jbd2_journal_flush(journal
);
4832 /* Journal blocked and flushed, clear needs_recovery flag. */
4833 ext4_clear_feature_journal_needs_recovery(sb
);
4836 error
= ext4_commit_super(sb
, 1);
4839 /* we rely on upper layer to stop further updates */
4840 jbd2_journal_unlock_updates(journal
);
4845 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4846 * flag here, even though the filesystem is not technically dirty yet.
4848 static int ext4_unfreeze(struct super_block
*sb
)
4850 if ((sb
->s_flags
& MS_RDONLY
) || ext4_forced_shutdown(EXT4_SB(sb
)))
4853 if (EXT4_SB(sb
)->s_journal
) {
4854 /* Reset the needs_recovery flag before the fs is unlocked. */
4855 ext4_set_feature_journal_needs_recovery(sb
);
4858 ext4_commit_super(sb
, 1);
4863 * Structure to save mount options for ext4_remount's benefit
4865 struct ext4_mount_options
{
4866 unsigned long s_mount_opt
;
4867 unsigned long s_mount_opt2
;
4870 unsigned long s_commit_interval
;
4871 u32 s_min_batch_time
, s_max_batch_time
;
4874 char *s_qf_names
[EXT4_MAXQUOTAS
];
4878 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
4880 struct ext4_super_block
*es
;
4881 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4882 unsigned long old_sb_flags
;
4883 struct ext4_mount_options old_opts
;
4884 int enable_quota
= 0;
4886 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
4891 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
4893 /* Store the original options */
4894 old_sb_flags
= sb
->s_flags
;
4895 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
4896 old_opts
.s_mount_opt2
= sbi
->s_mount_opt2
;
4897 old_opts
.s_resuid
= sbi
->s_resuid
;
4898 old_opts
.s_resgid
= sbi
->s_resgid
;
4899 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
4900 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
4901 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
4903 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
4904 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
4905 if (sbi
->s_qf_names
[i
]) {
4906 old_opts
.s_qf_names
[i
] = kstrdup(sbi
->s_qf_names
[i
],
4908 if (!old_opts
.s_qf_names
[i
]) {
4909 for (j
= 0; j
< i
; j
++)
4910 kfree(old_opts
.s_qf_names
[j
]);
4915 old_opts
.s_qf_names
[i
] = NULL
;
4917 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
4918 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
4920 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
, 1)) {
4925 if ((old_opts
.s_mount_opt
& EXT4_MOUNT_JOURNAL_CHECKSUM
) ^
4926 test_opt(sb
, JOURNAL_CHECKSUM
)) {
4927 ext4_msg(sb
, KERN_ERR
, "changing journal_checksum "
4928 "during remount not supported; ignoring");
4929 sbi
->s_mount_opt
^= EXT4_MOUNT_JOURNAL_CHECKSUM
;
4932 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
4933 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
4934 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4935 "both data=journal and delalloc");
4939 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
4940 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4941 "both data=journal and dioread_nolock");
4945 if (test_opt(sb
, DAX
)) {
4946 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4947 "both data=journal and dax");
4951 } else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
) {
4952 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
4953 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4954 "journal_async_commit in data=ordered mode");
4960 if ((sbi
->s_mount_opt
^ old_opts
.s_mount_opt
) & EXT4_MOUNT_DAX
) {
4961 ext4_msg(sb
, KERN_WARNING
, "warning: refusing change of "
4962 "dax flag with busy inodes while remounting");
4963 sbi
->s_mount_opt
^= EXT4_MOUNT_DAX
;
4966 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
4967 ext4_abort(sb
, "Abort forced by user");
4969 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
4970 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
4974 if (sbi
->s_journal
) {
4975 ext4_init_journal_params(sb
, sbi
->s_journal
);
4976 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
4979 if (*flags
& MS_LAZYTIME
)
4980 sb
->s_flags
|= MS_LAZYTIME
;
4982 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
)) {
4983 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
4988 if (*flags
& MS_RDONLY
) {
4989 err
= sync_filesystem(sb
);
4992 err
= dquot_suspend(sb
, -1);
4997 * First of all, the unconditional stuff we have to do
4998 * to disable replay of the journal when we next remount
5000 sb
->s_flags
|= MS_RDONLY
;
5003 * OK, test if we are remounting a valid rw partition
5004 * readonly, and if so set the rdonly flag and then
5005 * mark the partition as valid again.
5007 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
5008 (sbi
->s_mount_state
& EXT4_VALID_FS
))
5009 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
5012 ext4_mark_recovery_complete(sb
, es
);
5014 /* Make sure we can mount this feature set readwrite */
5015 if (ext4_has_feature_readonly(sb
) ||
5016 !ext4_feature_set_ok(sb
, 0)) {
5021 * Make sure the group descriptor checksums
5022 * are sane. If they aren't, refuse to remount r/w.
5024 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
5025 struct ext4_group_desc
*gdp
=
5026 ext4_get_group_desc(sb
, g
, NULL
);
5028 if (!ext4_group_desc_csum_verify(sb
, g
, gdp
)) {
5029 ext4_msg(sb
, KERN_ERR
,
5030 "ext4_remount: Checksum for group %u failed (%u!=%u)",
5031 g
, le16_to_cpu(ext4_group_desc_csum(sb
, g
, gdp
)),
5032 le16_to_cpu(gdp
->bg_checksum
));
5039 * If we have an unprocessed orphan list hanging
5040 * around from a previously readonly bdev mount,
5041 * require a full umount/remount for now.
5043 if (es
->s_last_orphan
) {
5044 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
5045 "remount RDWR because of unprocessed "
5046 "orphan inode list. Please "
5047 "umount/remount instead");
5053 * Mounting a RDONLY partition read-write, so reread
5054 * and store the current valid flag. (It may have
5055 * been changed by e2fsck since we originally mounted
5059 ext4_clear_journal_err(sb
, es
);
5060 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
5061 if (!ext4_setup_super(sb
, es
, 0))
5062 sb
->s_flags
&= ~MS_RDONLY
;
5063 if (ext4_has_feature_mmp(sb
))
5064 if (ext4_multi_mount_protect(sb
,
5065 le64_to_cpu(es
->s_mmp_block
))) {
5074 * Reinitialize lazy itable initialization thread based on
5077 if ((sb
->s_flags
& MS_RDONLY
) || !test_opt(sb
, INIT_INODE_TABLE
))
5078 ext4_unregister_li_request(sb
);
5080 ext4_group_t first_not_zeroed
;
5081 first_not_zeroed
= ext4_has_uninit_itable(sb
);
5082 ext4_register_li_request(sb
, first_not_zeroed
);
5085 ext4_setup_system_zone(sb
);
5086 if (sbi
->s_journal
== NULL
&& !(old_sb_flags
& MS_RDONLY
))
5087 ext4_commit_super(sb
, 1);
5090 /* Release old quota file names */
5091 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
5092 kfree(old_opts
.s_qf_names
[i
]);
5094 if (sb_any_quota_suspended(sb
))
5095 dquot_resume(sb
, -1);
5096 else if (ext4_has_feature_quota(sb
)) {
5097 err
= ext4_enable_quotas(sb
);
5104 *flags
= (*flags
& ~MS_LAZYTIME
) | (sb
->s_flags
& MS_LAZYTIME
);
5105 ext4_msg(sb
, KERN_INFO
, "re-mounted. Opts: %s", orig_data
);
5110 sb
->s_flags
= old_sb_flags
;
5111 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
5112 sbi
->s_mount_opt2
= old_opts
.s_mount_opt2
;
5113 sbi
->s_resuid
= old_opts
.s_resuid
;
5114 sbi
->s_resgid
= old_opts
.s_resgid
;
5115 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
5116 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
5117 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
5119 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
5120 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++) {
5121 kfree(sbi
->s_qf_names
[i
]);
5122 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
5130 static int ext4_statfs_project(struct super_block
*sb
,
5131 kprojid_t projid
, struct kstatfs
*buf
)
5134 struct dquot
*dquot
;
5138 qid
= make_kqid_projid(projid
);
5139 dquot
= dqget(sb
, qid
);
5141 return PTR_ERR(dquot
);
5142 spin_lock(&dq_data_lock
);
5144 limit
= (dquot
->dq_dqb
.dqb_bsoftlimit
?
5145 dquot
->dq_dqb
.dqb_bsoftlimit
:
5146 dquot
->dq_dqb
.dqb_bhardlimit
) >> sb
->s_blocksize_bits
;
5147 if (limit
&& buf
->f_blocks
> limit
) {
5148 curblock
= dquot
->dq_dqb
.dqb_curspace
>> sb
->s_blocksize_bits
;
5149 buf
->f_blocks
= limit
;
5150 buf
->f_bfree
= buf
->f_bavail
=
5151 (buf
->f_blocks
> curblock
) ?
5152 (buf
->f_blocks
- curblock
) : 0;
5155 limit
= dquot
->dq_dqb
.dqb_isoftlimit
?
5156 dquot
->dq_dqb
.dqb_isoftlimit
:
5157 dquot
->dq_dqb
.dqb_ihardlimit
;
5158 if (limit
&& buf
->f_files
> limit
) {
5159 buf
->f_files
= limit
;
5161 (buf
->f_files
> dquot
->dq_dqb
.dqb_curinodes
) ?
5162 (buf
->f_files
- dquot
->dq_dqb
.dqb_curinodes
) : 0;
5165 spin_unlock(&dq_data_lock
);
5171 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
5173 struct super_block
*sb
= dentry
->d_sb
;
5174 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
5175 struct ext4_super_block
*es
= sbi
->s_es
;
5176 ext4_fsblk_t overhead
= 0, resv_blocks
;
5179 resv_blocks
= EXT4_C2B(sbi
, atomic64_read(&sbi
->s_resv_clusters
));
5181 if (!test_opt(sb
, MINIX_DF
))
5182 overhead
= sbi
->s_overhead
;
5184 buf
->f_type
= EXT4_SUPER_MAGIC
;
5185 buf
->f_bsize
= sb
->s_blocksize
;
5186 buf
->f_blocks
= ext4_blocks_count(es
) - EXT4_C2B(sbi
, overhead
);
5187 bfree
= percpu_counter_sum_positive(&sbi
->s_freeclusters_counter
) -
5188 percpu_counter_sum_positive(&sbi
->s_dirtyclusters_counter
);
5189 /* prevent underflow in case that few free space is available */
5190 buf
->f_bfree
= EXT4_C2B(sbi
, max_t(s64
, bfree
, 0));
5191 buf
->f_bavail
= buf
->f_bfree
-
5192 (ext4_r_blocks_count(es
) + resv_blocks
);
5193 if (buf
->f_bfree
< (ext4_r_blocks_count(es
) + resv_blocks
))
5195 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
5196 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
5197 buf
->f_namelen
= EXT4_NAME_LEN
;
5198 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
5199 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
5200 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
5201 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
5204 if (ext4_test_inode_flag(dentry
->d_inode
, EXT4_INODE_PROJINHERIT
) &&
5205 sb_has_quota_limits_enabled(sb
, PRJQUOTA
))
5206 ext4_statfs_project(sb
, EXT4_I(dentry
->d_inode
)->i_projid
, buf
);
5211 /* Helper function for writing quotas on sync - we need to start transaction
5212 * before quota file is locked for write. Otherwise the are possible deadlocks:
5213 * Process 1 Process 2
5214 * ext4_create() quota_sync()
5215 * jbd2_journal_start() write_dquot()
5216 * dquot_initialize() down(dqio_mutex)
5217 * down(dqio_mutex) jbd2_journal_start()
5223 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
5225 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_id
.type
];
5228 static int ext4_write_dquot(struct dquot
*dquot
)
5232 struct inode
*inode
;
5234 inode
= dquot_to_inode(dquot
);
5235 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
,
5236 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
5238 return PTR_ERR(handle
);
5239 ret
= dquot_commit(dquot
);
5240 err
= ext4_journal_stop(handle
);
5246 static int ext4_acquire_dquot(struct dquot
*dquot
)
5251 handle
= ext4_journal_start(dquot_to_inode(dquot
), EXT4_HT_QUOTA
,
5252 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
5254 return PTR_ERR(handle
);
5255 ret
= dquot_acquire(dquot
);
5256 err
= ext4_journal_stop(handle
);
5262 static int ext4_release_dquot(struct dquot
*dquot
)
5267 handle
= ext4_journal_start(dquot_to_inode(dquot
), EXT4_HT_QUOTA
,
5268 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
5269 if (IS_ERR(handle
)) {
5270 /* Release dquot anyway to avoid endless cycle in dqput() */
5271 dquot_release(dquot
);
5272 return PTR_ERR(handle
);
5274 ret
= dquot_release(dquot
);
5275 err
= ext4_journal_stop(handle
);
5281 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
5283 struct super_block
*sb
= dquot
->dq_sb
;
5284 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
5286 /* Are we journaling quotas? */
5287 if (ext4_has_feature_quota(sb
) ||
5288 sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
5289 dquot_mark_dquot_dirty(dquot
);
5290 return ext4_write_dquot(dquot
);
5292 return dquot_mark_dquot_dirty(dquot
);
5296 static int ext4_write_info(struct super_block
*sb
, int type
)
5301 /* Data block + inode block */
5302 handle
= ext4_journal_start(d_inode(sb
->s_root
), EXT4_HT_QUOTA
, 2);
5304 return PTR_ERR(handle
);
5305 ret
= dquot_commit_info(sb
, type
);
5306 err
= ext4_journal_stop(handle
);
5313 * Turn on quotas during mount time - we need to find
5314 * the quota file and such...
5316 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
5318 return dquot_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
5319 EXT4_SB(sb
)->s_jquota_fmt
, type
);
5322 static void lockdep_set_quota_inode(struct inode
*inode
, int subclass
)
5324 struct ext4_inode_info
*ei
= EXT4_I(inode
);
5326 /* The first argument of lockdep_set_subclass has to be
5327 * *exactly* the same as the argument to init_rwsem() --- in
5328 * this case, in init_once() --- or lockdep gets unhappy
5329 * because the name of the lock is set using the
5330 * stringification of the argument to init_rwsem().
5332 (void) ei
; /* shut up clang warning if !CONFIG_LOCKDEP */
5333 lockdep_set_subclass(&ei
->i_data_sem
, subclass
);
5337 * Standard function to be called on quota_on
5339 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
5340 const struct path
*path
)
5344 if (!test_opt(sb
, QUOTA
))
5347 /* Quotafile not on the same filesystem? */
5348 if (path
->dentry
->d_sb
!= sb
)
5350 /* Journaling quota? */
5351 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
5352 /* Quotafile not in fs root? */
5353 if (path
->dentry
->d_parent
!= sb
->s_root
)
5354 ext4_msg(sb
, KERN_WARNING
,
5355 "Quota file not on filesystem root. "
5356 "Journaled quota will not work");
5360 * When we journal data on quota file, we have to flush journal to see
5361 * all updates to the file when we bypass pagecache...
5363 if (EXT4_SB(sb
)->s_journal
&&
5364 ext4_should_journal_data(d_inode(path
->dentry
))) {
5366 * We don't need to lock updates but journal_flush() could
5367 * otherwise be livelocked...
5369 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
5370 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
5371 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
5376 lockdep_set_quota_inode(path
->dentry
->d_inode
, I_DATA_SEM_QUOTA
);
5377 err
= dquot_quota_on(sb
, type
, format_id
, path
);
5379 lockdep_set_quota_inode(path
->dentry
->d_inode
,
5382 struct inode
*inode
= d_inode(path
->dentry
);
5386 * Set inode flags to prevent userspace from messing with quota
5387 * files. If this fails, we return success anyway since quotas
5388 * are already enabled and this is not a hard failure.
5391 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
, 1);
5394 EXT4_I(inode
)->i_flags
|= EXT4_NOATIME_FL
| EXT4_IMMUTABLE_FL
;
5395 inode_set_flags(inode
, S_NOATIME
| S_IMMUTABLE
,
5396 S_NOATIME
| S_IMMUTABLE
);
5397 ext4_mark_inode_dirty(handle
, inode
);
5398 ext4_journal_stop(handle
);
5400 inode_unlock(inode
);
5405 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
5409 struct inode
*qf_inode
;
5410 unsigned long qf_inums
[EXT4_MAXQUOTAS
] = {
5411 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
5412 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
),
5413 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_prj_quota_inum
)
5416 BUG_ON(!ext4_has_feature_quota(sb
));
5418 if (!qf_inums
[type
])
5421 qf_inode
= ext4_iget(sb
, qf_inums
[type
]);
5422 if (IS_ERR(qf_inode
)) {
5423 ext4_error(sb
, "Bad quota inode # %lu", qf_inums
[type
]);
5424 return PTR_ERR(qf_inode
);
5427 /* Don't account quota for quota files to avoid recursion */
5428 qf_inode
->i_flags
|= S_NOQUOTA
;
5429 lockdep_set_quota_inode(qf_inode
, I_DATA_SEM_QUOTA
);
5430 err
= dquot_enable(qf_inode
, type
, format_id
, flags
);
5433 lockdep_set_quota_inode(qf_inode
, I_DATA_SEM_NORMAL
);
5438 /* Enable usage tracking for all quota types. */
5439 static int ext4_enable_quotas(struct super_block
*sb
)
5442 unsigned long qf_inums
[EXT4_MAXQUOTAS
] = {
5443 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
5444 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
),
5445 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_prj_quota_inum
)
5447 bool quota_mopt
[EXT4_MAXQUOTAS
] = {
5448 test_opt(sb
, USRQUOTA
),
5449 test_opt(sb
, GRPQUOTA
),
5450 test_opt(sb
, PRJQUOTA
),
5453 sb_dqopt(sb
)->flags
|= DQUOT_QUOTA_SYS_FILE
;
5454 for (type
= 0; type
< EXT4_MAXQUOTAS
; type
++) {
5455 if (qf_inums
[type
]) {
5456 err
= ext4_quota_enable(sb
, type
, QFMT_VFS_V1
,
5457 DQUOT_USAGE_ENABLED
|
5458 (quota_mopt
[type
] ? DQUOT_LIMITS_ENABLED
: 0));
5461 "Failed to enable quota tracking "
5462 "(type=%d, err=%d). Please run "
5463 "e2fsck to fix.", type
, err
);
5471 static int ext4_quota_off(struct super_block
*sb
, int type
)
5473 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5477 /* Force all delayed allocation blocks to be allocated.
5478 * Caller already holds s_umount sem */
5479 if (test_opt(sb
, DELALLOC
))
5480 sync_filesystem(sb
);
5482 if (!inode
|| !igrab(inode
))
5485 err
= dquot_quota_off(sb
, type
);
5486 if (err
|| ext4_has_feature_quota(sb
))
5491 * Update modification times of quota files when userspace can
5492 * start looking at them. If we fail, we return success anyway since
5493 * this is not a hard failure and quotas are already disabled.
5495 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
, 1);
5498 EXT4_I(inode
)->i_flags
&= ~(EXT4_NOATIME_FL
| EXT4_IMMUTABLE_FL
);
5499 inode_set_flags(inode
, 0, S_NOATIME
| S_IMMUTABLE
);
5500 inode
->i_mtime
= inode
->i_ctime
= current_time(inode
);
5501 ext4_mark_inode_dirty(handle
, inode
);
5502 ext4_journal_stop(handle
);
5504 inode_unlock(inode
);
5506 lockdep_set_quota_inode(inode
, I_DATA_SEM_NORMAL
);
5510 return dquot_quota_off(sb
, type
);
5513 /* Read data from quotafile - avoid pagecache and such because we cannot afford
5514 * acquiring the locks... As quota files are never truncated and quota code
5515 * itself serializes the operations (and no one else should touch the files)
5516 * we don't have to be afraid of races */
5517 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
5518 size_t len
, loff_t off
)
5520 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5521 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5522 int offset
= off
& (sb
->s_blocksize
- 1);
5525 struct buffer_head
*bh
;
5526 loff_t i_size
= i_size_read(inode
);
5530 if (off
+len
> i_size
)
5533 while (toread
> 0) {
5534 tocopy
= sb
->s_blocksize
- offset
< toread
?
5535 sb
->s_blocksize
- offset
: toread
;
5536 bh
= ext4_bread(NULL
, inode
, blk
, 0);
5539 if (!bh
) /* A hole? */
5540 memset(data
, 0, tocopy
);
5542 memcpy(data
, bh
->b_data
+offset
, tocopy
);
5552 /* Write to quotafile (we know the transaction is already started and has
5553 * enough credits) */
5554 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
5555 const char *data
, size_t len
, loff_t off
)
5557 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5558 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5559 int err
, offset
= off
& (sb
->s_blocksize
- 1);
5561 struct buffer_head
*bh
;
5562 handle_t
*handle
= journal_current_handle();
5564 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
5565 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5566 " cancelled because transaction is not started",
5567 (unsigned long long)off
, (unsigned long long)len
);
5571 * Since we account only one data block in transaction credits,
5572 * then it is impossible to cross a block boundary.
5574 if (sb
->s_blocksize
- offset
< len
) {
5575 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5576 " cancelled because not block aligned",
5577 (unsigned long long)off
, (unsigned long long)len
);
5582 bh
= ext4_bread(handle
, inode
, blk
,
5583 EXT4_GET_BLOCKS_CREATE
|
5584 EXT4_GET_BLOCKS_METADATA_NOFAIL
);
5585 } while (IS_ERR(bh
) && (PTR_ERR(bh
) == -ENOSPC
) &&
5586 ext4_should_retry_alloc(inode
->i_sb
, &retries
));
5591 BUFFER_TRACE(bh
, "get write access");
5592 err
= ext4_journal_get_write_access(handle
, bh
);
5598 memcpy(bh
->b_data
+offset
, data
, len
);
5599 flush_dcache_page(bh
->b_page
);
5601 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
5604 if (inode
->i_size
< off
+ len
) {
5605 i_size_write(inode
, off
+ len
);
5606 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
5607 ext4_mark_inode_dirty(handle
, inode
);
5612 static int ext4_get_next_id(struct super_block
*sb
, struct kqid
*qid
)
5614 const struct quota_format_ops
*ops
;
5616 if (!sb_has_quota_loaded(sb
, qid
->type
))
5618 ops
= sb_dqopt(sb
)->ops
[qid
->type
];
5619 if (!ops
|| !ops
->get_next_id
)
5621 return dquot_get_next_id(sb
, qid
);
5625 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
5626 const char *dev_name
, void *data
)
5628 return mount_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
);
5631 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
5632 static inline void register_as_ext2(void)
5634 int err
= register_filesystem(&ext2_fs_type
);
5637 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
5640 static inline void unregister_as_ext2(void)
5642 unregister_filesystem(&ext2_fs_type
);
5645 static inline int ext2_feature_set_ok(struct super_block
*sb
)
5647 if (ext4_has_unknown_ext2_incompat_features(sb
))
5649 if (sb
->s_flags
& MS_RDONLY
)
5651 if (ext4_has_unknown_ext2_ro_compat_features(sb
))
5656 static inline void register_as_ext2(void) { }
5657 static inline void unregister_as_ext2(void) { }
5658 static inline int ext2_feature_set_ok(struct super_block
*sb
) { return 0; }
5661 static inline void register_as_ext3(void)
5663 int err
= register_filesystem(&ext3_fs_type
);
5666 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
5669 static inline void unregister_as_ext3(void)
5671 unregister_filesystem(&ext3_fs_type
);
5674 static inline int ext3_feature_set_ok(struct super_block
*sb
)
5676 if (ext4_has_unknown_ext3_incompat_features(sb
))
5678 if (!ext4_has_feature_journal(sb
))
5680 if (sb
->s_flags
& MS_RDONLY
)
5682 if (ext4_has_unknown_ext3_ro_compat_features(sb
))
5687 static struct file_system_type ext4_fs_type
= {
5688 .owner
= THIS_MODULE
,
5690 .mount
= ext4_mount
,
5691 .kill_sb
= kill_block_super
,
5692 .fs_flags
= FS_REQUIRES_DEV
,
5694 MODULE_ALIAS_FS("ext4");
5696 /* Shared across all ext4 file systems */
5697 wait_queue_head_t ext4__ioend_wq
[EXT4_WQ_HASH_SZ
];
5699 static int __init
ext4_init_fs(void)
5703 ratelimit_state_init(&ext4_mount_msg_ratelimit
, 30 * HZ
, 64);
5704 ext4_li_info
= NULL
;
5705 mutex_init(&ext4_li_mtx
);
5707 /* Build-time check for flags consistency */
5708 ext4_check_flag_values();
5710 for (i
= 0; i
< EXT4_WQ_HASH_SZ
; i
++)
5711 init_waitqueue_head(&ext4__ioend_wq
[i
]);
5713 err
= ext4_init_es();
5717 err
= ext4_init_pageio();
5721 err
= ext4_init_system_zone();
5725 err
= ext4_init_sysfs();
5729 err
= ext4_init_mballoc();
5732 err
= init_inodecache();
5737 err
= register_filesystem(&ext4_fs_type
);
5743 unregister_as_ext2();
5744 unregister_as_ext3();
5745 destroy_inodecache();
5747 ext4_exit_mballoc();
5751 ext4_exit_system_zone();
5760 static void __exit
ext4_exit_fs(void)
5762 ext4_destroy_lazyinit_thread();
5763 unregister_as_ext2();
5764 unregister_as_ext3();
5765 unregister_filesystem(&ext4_fs_type
);
5766 destroy_inodecache();
5767 ext4_exit_mballoc();
5769 ext4_exit_system_zone();
5774 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5775 MODULE_DESCRIPTION("Fourth Extended Filesystem");
5776 MODULE_LICENSE("GPL");
5777 module_init(ext4_init_fs
)
5778 module_exit(ext4_exit_fs
)