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
);
377 ext4_process_freed_data(sb
, txn
->t_tid
);
379 spin_lock(&sbi
->s_md_lock
);
380 while (!list_empty(&txn
->t_private_list
)) {
381 jce
= list_entry(txn
->t_private_list
.next
,
382 struct ext4_journal_cb_entry
, jce_list
);
383 list_del_init(&jce
->jce_list
);
384 spin_unlock(&sbi
->s_md_lock
);
385 jce
->jce_func(sb
, jce
, error
);
386 spin_lock(&sbi
->s_md_lock
);
388 spin_unlock(&sbi
->s_md_lock
);
391 /* Deal with the reporting of failure conditions on a filesystem such as
392 * inconsistencies detected or read IO failures.
394 * On ext2, we can store the error state of the filesystem in the
395 * superblock. That is not possible on ext4, because we may have other
396 * write ordering constraints on the superblock which prevent us from
397 * writing it out straight away; and given that the journal is about to
398 * be aborted, we can't rely on the current, or future, transactions to
399 * write out the superblock safely.
401 * We'll just use the jbd2_journal_abort() error code to record an error in
402 * the journal instead. On recovery, the journal will complain about
403 * that error until we've noted it down and cleared it.
406 static void ext4_handle_error(struct super_block
*sb
)
411 if (!test_opt(sb
, ERRORS_CONT
)) {
412 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
414 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
416 jbd2_journal_abort(journal
, -EIO
);
418 if (test_opt(sb
, ERRORS_RO
)) {
419 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
421 * Make sure updated value of ->s_mount_flags will be visible
422 * before ->s_flags update
425 sb
->s_flags
|= MS_RDONLY
;
427 if (test_opt(sb
, ERRORS_PANIC
)) {
428 if (EXT4_SB(sb
)->s_journal
&&
429 !(EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_REC_ERR
))
431 panic("EXT4-fs (device %s): panic forced after error\n",
436 #define ext4_error_ratelimit(sb) \
437 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
440 void __ext4_error(struct super_block
*sb
, const char *function
,
441 unsigned int line
, const char *fmt
, ...)
443 struct va_format vaf
;
446 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
449 if (ext4_error_ratelimit(sb
)) {
454 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
455 sb
->s_id
, function
, line
, current
->comm
, &vaf
);
458 save_error_info(sb
, function
, line
);
459 ext4_handle_error(sb
);
462 void __ext4_error_inode(struct inode
*inode
, const char *function
,
463 unsigned int line
, ext4_fsblk_t block
,
464 const char *fmt
, ...)
467 struct va_format vaf
;
468 struct ext4_super_block
*es
= EXT4_SB(inode
->i_sb
)->s_es
;
470 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode
->i_sb
))))
473 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
474 es
->s_last_error_block
= cpu_to_le64(block
);
475 if (ext4_error_ratelimit(inode
->i_sb
)) {
480 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
481 "inode #%lu: block %llu: comm %s: %pV\n",
482 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
483 block
, current
->comm
, &vaf
);
485 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
486 "inode #%lu: comm %s: %pV\n",
487 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
488 current
->comm
, &vaf
);
491 save_error_info(inode
->i_sb
, function
, line
);
492 ext4_handle_error(inode
->i_sb
);
495 void __ext4_error_file(struct file
*file
, const char *function
,
496 unsigned int line
, ext4_fsblk_t block
,
497 const char *fmt
, ...)
500 struct va_format vaf
;
501 struct ext4_super_block
*es
;
502 struct inode
*inode
= file_inode(file
);
503 char pathname
[80], *path
;
505 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode
->i_sb
))))
508 es
= EXT4_SB(inode
->i_sb
)->s_es
;
509 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
510 if (ext4_error_ratelimit(inode
->i_sb
)) {
511 path
= file_path(file
, pathname
, sizeof(pathname
));
519 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
520 "block %llu: comm %s: path %s: %pV\n",
521 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
522 block
, current
->comm
, path
, &vaf
);
525 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
526 "comm %s: path %s: %pV\n",
527 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
528 current
->comm
, path
, &vaf
);
531 save_error_info(inode
->i_sb
, function
, line
);
532 ext4_handle_error(inode
->i_sb
);
535 const char *ext4_decode_error(struct super_block
*sb
, int errno
,
542 errstr
= "Corrupt filesystem";
545 errstr
= "Filesystem failed CRC";
548 errstr
= "IO failure";
551 errstr
= "Out of memory";
554 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
555 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
556 errstr
= "Journal has aborted";
558 errstr
= "Readonly filesystem";
561 /* If the caller passed in an extra buffer for unknown
562 * errors, textualise them now. Else we just return
565 /* Check for truncated error codes... */
566 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
575 /* __ext4_std_error decodes expected errors from journaling functions
576 * automatically and invokes the appropriate error response. */
578 void __ext4_std_error(struct super_block
*sb
, const char *function
,
579 unsigned int line
, int errno
)
584 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
587 /* Special case: if the error is EROFS, and we're not already
588 * inside a transaction, then there's really no point in logging
590 if (errno
== -EROFS
&& journal_current_handle() == NULL
&& sb_rdonly(sb
))
593 if (ext4_error_ratelimit(sb
)) {
594 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
595 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s:%d: %s\n",
596 sb
->s_id
, function
, line
, errstr
);
599 save_error_info(sb
, function
, line
);
600 ext4_handle_error(sb
);
604 * ext4_abort is a much stronger failure handler than ext4_error. The
605 * abort function may be used to deal with unrecoverable failures such
606 * as journal IO errors or ENOMEM at a critical moment in log management.
608 * We unconditionally force the filesystem into an ABORT|READONLY state,
609 * unless the error response on the fs has been set to panic in which
610 * case we take the easy way out and panic immediately.
613 void __ext4_abort(struct super_block
*sb
, const char *function
,
614 unsigned int line
, const char *fmt
, ...)
616 struct va_format vaf
;
619 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
622 save_error_info(sb
, function
, line
);
626 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: %pV\n",
627 sb
->s_id
, function
, line
, &vaf
);
630 if (sb_rdonly(sb
) == 0) {
631 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
632 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
634 * Make sure updated value of ->s_mount_flags will be visible
635 * before ->s_flags update
638 sb
->s_flags
|= MS_RDONLY
;
639 if (EXT4_SB(sb
)->s_journal
)
640 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
641 save_error_info(sb
, function
, line
);
643 if (test_opt(sb
, ERRORS_PANIC
)) {
644 if (EXT4_SB(sb
)->s_journal
&&
645 !(EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_REC_ERR
))
647 panic("EXT4-fs panic from previous error\n");
651 void __ext4_msg(struct super_block
*sb
,
652 const char *prefix
, const char *fmt
, ...)
654 struct va_format vaf
;
657 if (!___ratelimit(&(EXT4_SB(sb
)->s_msg_ratelimit_state
), "EXT4-fs"))
663 printk("%sEXT4-fs (%s): %pV\n", prefix
, sb
->s_id
, &vaf
);
667 #define ext4_warning_ratelimit(sb) \
668 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
671 void __ext4_warning(struct super_block
*sb
, const char *function
,
672 unsigned int line
, const char *fmt
, ...)
674 struct va_format vaf
;
677 if (!ext4_warning_ratelimit(sb
))
683 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: %pV\n",
684 sb
->s_id
, function
, line
, &vaf
);
688 void __ext4_warning_inode(const struct inode
*inode
, const char *function
,
689 unsigned int line
, const char *fmt
, ...)
691 struct va_format vaf
;
694 if (!ext4_warning_ratelimit(inode
->i_sb
))
700 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: "
701 "inode #%lu: comm %s: %pV\n", inode
->i_sb
->s_id
,
702 function
, line
, inode
->i_ino
, current
->comm
, &vaf
);
706 void __ext4_grp_locked_error(const char *function
, unsigned int line
,
707 struct super_block
*sb
, ext4_group_t grp
,
708 unsigned long ino
, ext4_fsblk_t block
,
709 const char *fmt
, ...)
713 struct va_format vaf
;
715 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
717 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
720 es
->s_last_error_ino
= cpu_to_le32(ino
);
721 es
->s_last_error_block
= cpu_to_le64(block
);
722 __save_error_info(sb
, function
, line
);
724 if (ext4_error_ratelimit(sb
)) {
728 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: group %u, ",
729 sb
->s_id
, function
, line
, grp
);
731 printk(KERN_CONT
"inode %lu: ", ino
);
733 printk(KERN_CONT
"block %llu:",
734 (unsigned long long) block
);
735 printk(KERN_CONT
"%pV\n", &vaf
);
739 if (test_opt(sb
, ERRORS_CONT
)) {
740 ext4_commit_super(sb
, 0);
744 ext4_unlock_group(sb
, grp
);
745 ext4_handle_error(sb
);
747 * We only get here in the ERRORS_RO case; relocking the group
748 * may be dangerous, but nothing bad will happen since the
749 * filesystem will have already been marked read/only and the
750 * journal has been aborted. We return 1 as a hint to callers
751 * who might what to use the return value from
752 * ext4_grp_locked_error() to distinguish between the
753 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
754 * aggressively from the ext4 function in question, with a
755 * more appropriate error code.
757 ext4_lock_group(sb
, grp
);
761 void ext4_update_dynamic_rev(struct super_block
*sb
)
763 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
765 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
769 "updating to rev %d because of new feature flag, "
770 "running e2fsck is recommended",
773 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
774 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
775 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
776 /* leave es->s_feature_*compat flags alone */
777 /* es->s_uuid will be set by e2fsck if empty */
780 * The rest of the superblock fields should be zero, and if not it
781 * means they are likely already in use, so leave them alone. We
782 * can leave it up to e2fsck to clean up any inconsistencies there.
787 * Open the external journal device
789 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
791 struct block_device
*bdev
;
792 char b
[BDEVNAME_SIZE
];
794 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
, sb
);
800 ext4_msg(sb
, KERN_ERR
, "failed to open journal device %s: %ld",
801 __bdevname(dev
, b
), PTR_ERR(bdev
));
806 * Release the journal device
808 static void ext4_blkdev_put(struct block_device
*bdev
)
810 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
813 static void ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
815 struct block_device
*bdev
;
816 bdev
= sbi
->journal_bdev
;
818 ext4_blkdev_put(bdev
);
819 sbi
->journal_bdev
= NULL
;
823 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
825 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
828 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
832 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
833 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
835 printk(KERN_ERR
"sb_info orphan list:\n");
836 list_for_each(l
, &sbi
->s_orphan
) {
837 struct inode
*inode
= orphan_list_entry(l
);
839 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
840 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
841 inode
->i_mode
, inode
->i_nlink
,
847 static int ext4_quota_off(struct super_block
*sb
, int type
);
849 static inline void ext4_quota_off_umount(struct super_block
*sb
)
853 /* Use our quota_off function to clear inode flags etc. */
854 for (type
= 0; type
< EXT4_MAXQUOTAS
; type
++)
855 ext4_quota_off(sb
, type
);
858 static inline void ext4_quota_off_umount(struct super_block
*sb
)
863 static void ext4_put_super(struct super_block
*sb
)
865 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
866 struct ext4_super_block
*es
= sbi
->s_es
;
870 ext4_unregister_li_request(sb
);
871 ext4_quota_off_umount(sb
);
873 flush_workqueue(sbi
->rsv_conversion_wq
);
874 destroy_workqueue(sbi
->rsv_conversion_wq
);
876 if (sbi
->s_journal
) {
877 aborted
= is_journal_aborted(sbi
->s_journal
);
878 err
= jbd2_journal_destroy(sbi
->s_journal
);
879 sbi
->s_journal
= NULL
;
880 if ((err
< 0) && !aborted
)
881 ext4_abort(sb
, "Couldn't clean up the journal");
884 ext4_unregister_sysfs(sb
);
885 ext4_es_unregister_shrinker(sbi
);
886 del_timer_sync(&sbi
->s_err_report
);
887 ext4_release_system_zone(sb
);
889 ext4_ext_release(sb
);
891 if (!sb_rdonly(sb
) && !aborted
) {
892 ext4_clear_feature_journal_needs_recovery(sb
);
893 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
896 ext4_commit_super(sb
, 1);
898 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
899 brelse(sbi
->s_group_desc
[i
]);
900 kvfree(sbi
->s_group_desc
);
901 kvfree(sbi
->s_flex_groups
);
902 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
903 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
904 percpu_counter_destroy(&sbi
->s_dirs_counter
);
905 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
906 percpu_free_rwsem(&sbi
->s_journal_flag_rwsem
);
908 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
909 kfree(sbi
->s_qf_names
[i
]);
912 /* Debugging code just in case the in-memory inode orphan list
913 * isn't empty. The on-disk one can be non-empty if we've
914 * detected an error and taken the fs readonly, but the
915 * in-memory list had better be clean by this point. */
916 if (!list_empty(&sbi
->s_orphan
))
917 dump_orphan_list(sb
, sbi
);
918 J_ASSERT(list_empty(&sbi
->s_orphan
));
920 sync_blockdev(sb
->s_bdev
);
921 invalidate_bdev(sb
->s_bdev
);
922 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
924 * Invalidate the journal device's buffers. We don't want them
925 * floating about in memory - the physical journal device may
926 * hotswapped, and it breaks the `ro-after' testing code.
928 sync_blockdev(sbi
->journal_bdev
);
929 invalidate_bdev(sbi
->journal_bdev
);
930 ext4_blkdev_remove(sbi
);
932 if (sbi
->s_ea_inode_cache
) {
933 ext4_xattr_destroy_cache(sbi
->s_ea_inode_cache
);
934 sbi
->s_ea_inode_cache
= NULL
;
936 if (sbi
->s_ea_block_cache
) {
937 ext4_xattr_destroy_cache(sbi
->s_ea_block_cache
);
938 sbi
->s_ea_block_cache
= NULL
;
941 kthread_stop(sbi
->s_mmp_tsk
);
943 sb
->s_fs_info
= NULL
;
945 * Now that we are completely done shutting down the
946 * superblock, we need to actually destroy the kobject.
948 kobject_put(&sbi
->s_kobj
);
949 wait_for_completion(&sbi
->s_kobj_unregister
);
950 if (sbi
->s_chksum_driver
)
951 crypto_free_shash(sbi
->s_chksum_driver
);
952 kfree(sbi
->s_blockgroup_lock
);
953 fs_put_dax(sbi
->s_daxdev
);
957 static struct kmem_cache
*ext4_inode_cachep
;
960 * Called inside transaction, so use GFP_NOFS
962 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
964 struct ext4_inode_info
*ei
;
966 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
970 ei
->vfs_inode
.i_version
= 1;
971 spin_lock_init(&ei
->i_raw_lock
);
972 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
973 spin_lock_init(&ei
->i_prealloc_lock
);
974 ext4_es_init_tree(&ei
->i_es_tree
);
975 rwlock_init(&ei
->i_es_lock
);
976 INIT_LIST_HEAD(&ei
->i_es_list
);
979 ei
->i_es_shrink_lblk
= 0;
980 ei
->i_reserved_data_blocks
= 0;
981 ei
->i_da_metadata_calc_len
= 0;
982 ei
->i_da_metadata_calc_last_lblock
= 0;
983 spin_lock_init(&(ei
->i_block_reservation_lock
));
985 ei
->i_reserved_quota
= 0;
986 memset(&ei
->i_dquot
, 0, sizeof(ei
->i_dquot
));
989 INIT_LIST_HEAD(&ei
->i_rsv_conversion_list
);
990 spin_lock_init(&ei
->i_completed_io_lock
);
992 ei
->i_datasync_tid
= 0;
993 atomic_set(&ei
->i_unwritten
, 0);
994 INIT_WORK(&ei
->i_rsv_conversion_work
, ext4_end_io_rsv_work
);
995 return &ei
->vfs_inode
;
998 static int ext4_drop_inode(struct inode
*inode
)
1000 int drop
= generic_drop_inode(inode
);
1002 trace_ext4_drop_inode(inode
, drop
);
1006 static void ext4_i_callback(struct rcu_head
*head
)
1008 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
1009 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
1012 static void ext4_destroy_inode(struct inode
*inode
)
1014 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
1015 ext4_msg(inode
->i_sb
, KERN_ERR
,
1016 "Inode %lu (%p): orphan list check failed!",
1017 inode
->i_ino
, EXT4_I(inode
));
1018 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
1019 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
1023 call_rcu(&inode
->i_rcu
, ext4_i_callback
);
1026 static void init_once(void *foo
)
1028 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
1030 INIT_LIST_HEAD(&ei
->i_orphan
);
1031 init_rwsem(&ei
->xattr_sem
);
1032 init_rwsem(&ei
->i_data_sem
);
1033 init_rwsem(&ei
->i_mmap_sem
);
1034 inode_init_once(&ei
->vfs_inode
);
1037 static int __init
init_inodecache(void)
1039 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
1040 sizeof(struct ext4_inode_info
),
1041 0, (SLAB_RECLAIM_ACCOUNT
|
1042 SLAB_MEM_SPREAD
|SLAB_ACCOUNT
),
1044 if (ext4_inode_cachep
== NULL
)
1049 static void destroy_inodecache(void)
1052 * Make sure all delayed rcu free inodes are flushed before we
1056 kmem_cache_destroy(ext4_inode_cachep
);
1059 void ext4_clear_inode(struct inode
*inode
)
1061 invalidate_inode_buffers(inode
);
1064 ext4_discard_preallocations(inode
);
1065 ext4_es_remove_extent(inode
, 0, EXT_MAX_BLOCKS
);
1066 if (EXT4_I(inode
)->jinode
) {
1067 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode
),
1068 EXT4_I(inode
)->jinode
);
1069 jbd2_free_inode(EXT4_I(inode
)->jinode
);
1070 EXT4_I(inode
)->jinode
= NULL
;
1072 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1073 fscrypt_put_encryption_info(inode
, NULL
);
1077 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
1078 u64 ino
, u32 generation
)
1080 struct inode
*inode
;
1082 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
1083 return ERR_PTR(-ESTALE
);
1084 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
1085 return ERR_PTR(-ESTALE
);
1087 /* iget isn't really right if the inode is currently unallocated!!
1089 * ext4_read_inode will return a bad_inode if the inode had been
1090 * deleted, so we should be safe.
1092 * Currently we don't know the generation for parent directory, so
1093 * a generation of 0 means "accept any"
1095 inode
= ext4_iget_normal(sb
, ino
);
1097 return ERR_CAST(inode
);
1098 if (generation
&& inode
->i_generation
!= generation
) {
1100 return ERR_PTR(-ESTALE
);
1106 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
1107 int fh_len
, int fh_type
)
1109 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
1110 ext4_nfs_get_inode
);
1113 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
1114 int fh_len
, int fh_type
)
1116 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
1117 ext4_nfs_get_inode
);
1121 * Try to release metadata pages (indirect blocks, directories) which are
1122 * mapped via the block device. Since these pages could have journal heads
1123 * which would prevent try_to_free_buffers() from freeing them, we must use
1124 * jbd2 layer's try_to_free_buffers() function to release them.
1126 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
1129 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
1131 WARN_ON(PageChecked(page
));
1132 if (!page_has_buffers(page
))
1135 return jbd2_journal_try_to_free_buffers(journal
, page
,
1136 wait
& ~__GFP_DIRECT_RECLAIM
);
1137 return try_to_free_buffers(page
);
1140 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1141 static int ext4_get_context(struct inode
*inode
, void *ctx
, size_t len
)
1143 return ext4_xattr_get(inode
, EXT4_XATTR_INDEX_ENCRYPTION
,
1144 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT
, ctx
, len
);
1147 static int ext4_set_context(struct inode
*inode
, const void *ctx
, size_t len
,
1150 handle_t
*handle
= fs_data
;
1151 int res
, res2
, credits
, retries
= 0;
1154 * Encrypting the root directory is not allowed because e2fsck expects
1155 * lost+found to exist and be unencrypted, and encrypting the root
1156 * directory would imply encrypting the lost+found directory as well as
1157 * the filename "lost+found" itself.
1159 if (inode
->i_ino
== EXT4_ROOT_INO
)
1162 res
= ext4_convert_inline_data(inode
);
1167 * If a journal handle was specified, then the encryption context is
1168 * being set on a new inode via inheritance and is part of a larger
1169 * transaction to create the inode. Otherwise the encryption context is
1170 * being set on an existing inode in its own transaction. Only in the
1171 * latter case should the "retry on ENOSPC" logic be used.
1175 res
= ext4_xattr_set_handle(handle
, inode
,
1176 EXT4_XATTR_INDEX_ENCRYPTION
,
1177 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT
,
1180 ext4_set_inode_flag(inode
, EXT4_INODE_ENCRYPT
);
1181 ext4_clear_inode_state(inode
,
1182 EXT4_STATE_MAY_INLINE_DATA
);
1184 * Update inode->i_flags - e.g. S_DAX may get disabled
1186 ext4_set_inode_flags(inode
);
1191 res
= dquot_initialize(inode
);
1195 res
= ext4_xattr_set_credits(inode
, len
, false /* is_create */,
1200 handle
= ext4_journal_start(inode
, EXT4_HT_MISC
, credits
);
1202 return PTR_ERR(handle
);
1204 res
= ext4_xattr_set_handle(handle
, inode
, EXT4_XATTR_INDEX_ENCRYPTION
,
1205 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT
,
1208 ext4_set_inode_flag(inode
, EXT4_INODE_ENCRYPT
);
1209 /* Update inode->i_flags - e.g. S_DAX may get disabled */
1210 ext4_set_inode_flags(inode
);
1211 res
= ext4_mark_inode_dirty(handle
, inode
);
1213 EXT4_ERROR_INODE(inode
, "Failed to mark inode dirty");
1215 res2
= ext4_journal_stop(handle
);
1217 if (res
== -ENOSPC
&& ext4_should_retry_alloc(inode
->i_sb
, &retries
))
1224 static bool ext4_dummy_context(struct inode
*inode
)
1226 return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode
->i_sb
));
1229 static unsigned ext4_max_namelen(struct inode
*inode
)
1231 return S_ISLNK(inode
->i_mode
) ? inode
->i_sb
->s_blocksize
:
1235 static const struct fscrypt_operations ext4_cryptops
= {
1236 .key_prefix
= "ext4:",
1237 .get_context
= ext4_get_context
,
1238 .set_context
= ext4_set_context
,
1239 .dummy_context
= ext4_dummy_context
,
1240 .is_encrypted
= ext4_encrypted_inode
,
1241 .empty_dir
= ext4_empty_dir
,
1242 .max_namelen
= ext4_max_namelen
,
1245 static const struct fscrypt_operations ext4_cryptops
= {
1246 .is_encrypted
= ext4_encrypted_inode
,
1251 static const char * const quotatypes
[] = INITQFNAMES
;
1252 #define QTYPE2NAME(t) (quotatypes[t])
1254 static int ext4_write_dquot(struct dquot
*dquot
);
1255 static int ext4_acquire_dquot(struct dquot
*dquot
);
1256 static int ext4_release_dquot(struct dquot
*dquot
);
1257 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1258 static int ext4_write_info(struct super_block
*sb
, int type
);
1259 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1260 const struct path
*path
);
1261 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1262 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1263 size_t len
, loff_t off
);
1264 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1265 const char *data
, size_t len
, loff_t off
);
1266 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
1267 unsigned int flags
);
1268 static int ext4_enable_quotas(struct super_block
*sb
);
1269 static int ext4_get_next_id(struct super_block
*sb
, struct kqid
*qid
);
1271 static struct dquot
**ext4_get_dquots(struct inode
*inode
)
1273 return EXT4_I(inode
)->i_dquot
;
1276 static const struct dquot_operations ext4_quota_operations
= {
1277 .get_reserved_space
= ext4_get_reserved_space
,
1278 .write_dquot
= ext4_write_dquot
,
1279 .acquire_dquot
= ext4_acquire_dquot
,
1280 .release_dquot
= ext4_release_dquot
,
1281 .mark_dirty
= ext4_mark_dquot_dirty
,
1282 .write_info
= ext4_write_info
,
1283 .alloc_dquot
= dquot_alloc
,
1284 .destroy_dquot
= dquot_destroy
,
1285 .get_projid
= ext4_get_projid
,
1286 .get_inode_usage
= ext4_get_inode_usage
,
1287 .get_next_id
= ext4_get_next_id
,
1290 static const struct quotactl_ops ext4_qctl_operations
= {
1291 .quota_on
= ext4_quota_on
,
1292 .quota_off
= ext4_quota_off
,
1293 .quota_sync
= dquot_quota_sync
,
1294 .get_state
= dquot_get_state
,
1295 .set_info
= dquot_set_dqinfo
,
1296 .get_dqblk
= dquot_get_dqblk
,
1297 .set_dqblk
= dquot_set_dqblk
,
1298 .get_nextdqblk
= dquot_get_next_dqblk
,
1302 static const struct super_operations ext4_sops
= {
1303 .alloc_inode
= ext4_alloc_inode
,
1304 .destroy_inode
= ext4_destroy_inode
,
1305 .write_inode
= ext4_write_inode
,
1306 .dirty_inode
= ext4_dirty_inode
,
1307 .drop_inode
= ext4_drop_inode
,
1308 .evict_inode
= ext4_evict_inode
,
1309 .put_super
= ext4_put_super
,
1310 .sync_fs
= ext4_sync_fs
,
1311 .freeze_fs
= ext4_freeze
,
1312 .unfreeze_fs
= ext4_unfreeze
,
1313 .statfs
= ext4_statfs
,
1314 .remount_fs
= ext4_remount
,
1315 .show_options
= ext4_show_options
,
1317 .quota_read
= ext4_quota_read
,
1318 .quota_write
= ext4_quota_write
,
1319 .get_dquots
= ext4_get_dquots
,
1321 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1324 static const struct export_operations ext4_export_ops
= {
1325 .fh_to_dentry
= ext4_fh_to_dentry
,
1326 .fh_to_parent
= ext4_fh_to_parent
,
1327 .get_parent
= ext4_get_parent
,
1331 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1332 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1333 Opt_nouid32
, Opt_debug
, Opt_removed
,
1334 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1335 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
,
1336 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
, Opt_journal_dev
,
1337 Opt_journal_path
, Opt_journal_checksum
, Opt_journal_async_commit
,
1338 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1339 Opt_data_err_abort
, Opt_data_err_ignore
, Opt_test_dummy_encryption
,
1340 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1341 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1342 Opt_noquota
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1343 Opt_usrquota
, Opt_grpquota
, Opt_prjquota
, Opt_i_version
, Opt_dax
,
1344 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
, Opt_mblk_io_submit
,
1345 Opt_lazytime
, Opt_nolazytime
, Opt_debug_want_extra_isize
,
1346 Opt_nomblk_io_submit
, Opt_block_validity
, Opt_noblock_validity
,
1347 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1348 Opt_dioread_nolock
, Opt_dioread_lock
,
1349 Opt_discard
, Opt_nodiscard
, Opt_init_itable
, Opt_noinit_itable
,
1350 Opt_max_dir_size_kb
, Opt_nojournal_checksum
, Opt_nombcache
,
1353 static const match_table_t tokens
= {
1354 {Opt_bsd_df
, "bsddf"},
1355 {Opt_minix_df
, "minixdf"},
1356 {Opt_grpid
, "grpid"},
1357 {Opt_grpid
, "bsdgroups"},
1358 {Opt_nogrpid
, "nogrpid"},
1359 {Opt_nogrpid
, "sysvgroups"},
1360 {Opt_resgid
, "resgid=%u"},
1361 {Opt_resuid
, "resuid=%u"},
1363 {Opt_err_cont
, "errors=continue"},
1364 {Opt_err_panic
, "errors=panic"},
1365 {Opt_err_ro
, "errors=remount-ro"},
1366 {Opt_nouid32
, "nouid32"},
1367 {Opt_debug
, "debug"},
1368 {Opt_removed
, "oldalloc"},
1369 {Opt_removed
, "orlov"},
1370 {Opt_user_xattr
, "user_xattr"},
1371 {Opt_nouser_xattr
, "nouser_xattr"},
1373 {Opt_noacl
, "noacl"},
1374 {Opt_noload
, "norecovery"},
1375 {Opt_noload
, "noload"},
1376 {Opt_removed
, "nobh"},
1377 {Opt_removed
, "bh"},
1378 {Opt_commit
, "commit=%u"},
1379 {Opt_min_batch_time
, "min_batch_time=%u"},
1380 {Opt_max_batch_time
, "max_batch_time=%u"},
1381 {Opt_journal_dev
, "journal_dev=%u"},
1382 {Opt_journal_path
, "journal_path=%s"},
1383 {Opt_journal_checksum
, "journal_checksum"},
1384 {Opt_nojournal_checksum
, "nojournal_checksum"},
1385 {Opt_journal_async_commit
, "journal_async_commit"},
1386 {Opt_abort
, "abort"},
1387 {Opt_data_journal
, "data=journal"},
1388 {Opt_data_ordered
, "data=ordered"},
1389 {Opt_data_writeback
, "data=writeback"},
1390 {Opt_data_err_abort
, "data_err=abort"},
1391 {Opt_data_err_ignore
, "data_err=ignore"},
1392 {Opt_offusrjquota
, "usrjquota="},
1393 {Opt_usrjquota
, "usrjquota=%s"},
1394 {Opt_offgrpjquota
, "grpjquota="},
1395 {Opt_grpjquota
, "grpjquota=%s"},
1396 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1397 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1398 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1399 {Opt_grpquota
, "grpquota"},
1400 {Opt_noquota
, "noquota"},
1401 {Opt_quota
, "quota"},
1402 {Opt_usrquota
, "usrquota"},
1403 {Opt_prjquota
, "prjquota"},
1404 {Opt_barrier
, "barrier=%u"},
1405 {Opt_barrier
, "barrier"},
1406 {Opt_nobarrier
, "nobarrier"},
1407 {Opt_i_version
, "i_version"},
1409 {Opt_stripe
, "stripe=%u"},
1410 {Opt_delalloc
, "delalloc"},
1411 {Opt_lazytime
, "lazytime"},
1412 {Opt_nolazytime
, "nolazytime"},
1413 {Opt_debug_want_extra_isize
, "debug_want_extra_isize=%u"},
1414 {Opt_nodelalloc
, "nodelalloc"},
1415 {Opt_removed
, "mblk_io_submit"},
1416 {Opt_removed
, "nomblk_io_submit"},
1417 {Opt_block_validity
, "block_validity"},
1418 {Opt_noblock_validity
, "noblock_validity"},
1419 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1420 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1421 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1422 {Opt_auto_da_alloc
, "auto_da_alloc"},
1423 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1424 {Opt_dioread_nolock
, "dioread_nolock"},
1425 {Opt_dioread_lock
, "dioread_lock"},
1426 {Opt_discard
, "discard"},
1427 {Opt_nodiscard
, "nodiscard"},
1428 {Opt_init_itable
, "init_itable=%u"},
1429 {Opt_init_itable
, "init_itable"},
1430 {Opt_noinit_itable
, "noinit_itable"},
1431 {Opt_max_dir_size_kb
, "max_dir_size_kb=%u"},
1432 {Opt_test_dummy_encryption
, "test_dummy_encryption"},
1433 {Opt_nombcache
, "nombcache"},
1434 {Opt_nombcache
, "no_mbcache"}, /* for backward compatibility */
1435 {Opt_removed
, "check=none"}, /* mount option from ext2/3 */
1436 {Opt_removed
, "nocheck"}, /* mount option from ext2/3 */
1437 {Opt_removed
, "reservation"}, /* mount option from ext2/3 */
1438 {Opt_removed
, "noreservation"}, /* mount option from ext2/3 */
1439 {Opt_removed
, "journal=%u"}, /* mount option from ext2/3 */
1443 static ext4_fsblk_t
get_sb_block(void **data
)
1445 ext4_fsblk_t sb_block
;
1446 char *options
= (char *) *data
;
1448 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1449 return 1; /* Default location */
1452 /* TODO: use simple_strtoll with >32bit ext4 */
1453 sb_block
= simple_strtoul(options
, &options
, 0);
1454 if (*options
&& *options
!= ',') {
1455 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1459 if (*options
== ',')
1461 *data
= (void *) options
;
1466 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1467 static const char deprecated_msg
[] =
1468 "Mount option \"%s\" will be removed by %s\n"
1469 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1472 static int set_qf_name(struct super_block
*sb
, int qtype
, substring_t
*args
)
1474 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1478 if (sb_any_quota_loaded(sb
) &&
1479 !sbi
->s_qf_names
[qtype
]) {
1480 ext4_msg(sb
, KERN_ERR
,
1481 "Cannot change journaled "
1482 "quota options when quota turned on");
1485 if (ext4_has_feature_quota(sb
)) {
1486 ext4_msg(sb
, KERN_INFO
, "Journaled quota options "
1487 "ignored when QUOTA feature is enabled");
1490 qname
= match_strdup(args
);
1492 ext4_msg(sb
, KERN_ERR
,
1493 "Not enough memory for storing quotafile name");
1496 if (sbi
->s_qf_names
[qtype
]) {
1497 if (strcmp(sbi
->s_qf_names
[qtype
], qname
) == 0)
1500 ext4_msg(sb
, KERN_ERR
,
1501 "%s quota file already specified",
1505 if (strchr(qname
, '/')) {
1506 ext4_msg(sb
, KERN_ERR
,
1507 "quotafile must be on filesystem root");
1510 sbi
->s_qf_names
[qtype
] = qname
;
1518 static int clear_qf_name(struct super_block
*sb
, int qtype
)
1521 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1523 if (sb_any_quota_loaded(sb
) &&
1524 sbi
->s_qf_names
[qtype
]) {
1525 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled quota options"
1526 " when quota turned on");
1529 kfree(sbi
->s_qf_names
[qtype
]);
1530 sbi
->s_qf_names
[qtype
] = NULL
;
1535 #define MOPT_SET 0x0001
1536 #define MOPT_CLEAR 0x0002
1537 #define MOPT_NOSUPPORT 0x0004
1538 #define MOPT_EXPLICIT 0x0008
1539 #define MOPT_CLEAR_ERR 0x0010
1540 #define MOPT_GTE0 0x0020
1543 #define MOPT_QFMT 0x0040
1545 #define MOPT_Q MOPT_NOSUPPORT
1546 #define MOPT_QFMT MOPT_NOSUPPORT
1548 #define MOPT_DATAJ 0x0080
1549 #define MOPT_NO_EXT2 0x0100
1550 #define MOPT_NO_EXT3 0x0200
1551 #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1552 #define MOPT_STRING 0x0400
1554 static const struct mount_opts
{
1558 } ext4_mount_opts
[] = {
1559 {Opt_minix_df
, EXT4_MOUNT_MINIX_DF
, MOPT_SET
},
1560 {Opt_bsd_df
, EXT4_MOUNT_MINIX_DF
, MOPT_CLEAR
},
1561 {Opt_grpid
, EXT4_MOUNT_GRPID
, MOPT_SET
},
1562 {Opt_nogrpid
, EXT4_MOUNT_GRPID
, MOPT_CLEAR
},
1563 {Opt_block_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_SET
},
1564 {Opt_noblock_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_CLEAR
},
1565 {Opt_dioread_nolock
, EXT4_MOUNT_DIOREAD_NOLOCK
,
1566 MOPT_EXT4_ONLY
| MOPT_SET
},
1567 {Opt_dioread_lock
, EXT4_MOUNT_DIOREAD_NOLOCK
,
1568 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1569 {Opt_discard
, EXT4_MOUNT_DISCARD
, MOPT_SET
},
1570 {Opt_nodiscard
, EXT4_MOUNT_DISCARD
, MOPT_CLEAR
},
1571 {Opt_delalloc
, EXT4_MOUNT_DELALLOC
,
1572 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1573 {Opt_nodelalloc
, EXT4_MOUNT_DELALLOC
,
1574 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1575 {Opt_nojournal_checksum
, EXT4_MOUNT_JOURNAL_CHECKSUM
,
1576 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1577 {Opt_journal_checksum
, EXT4_MOUNT_JOURNAL_CHECKSUM
,
1578 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1579 {Opt_journal_async_commit
, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT
|
1580 EXT4_MOUNT_JOURNAL_CHECKSUM
),
1581 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1582 {Opt_noload
, EXT4_MOUNT_NOLOAD
, MOPT_NO_EXT2
| MOPT_SET
},
1583 {Opt_err_panic
, EXT4_MOUNT_ERRORS_PANIC
, MOPT_SET
| MOPT_CLEAR_ERR
},
1584 {Opt_err_ro
, EXT4_MOUNT_ERRORS_RO
, MOPT_SET
| MOPT_CLEAR_ERR
},
1585 {Opt_err_cont
, EXT4_MOUNT_ERRORS_CONT
, MOPT_SET
| MOPT_CLEAR_ERR
},
1586 {Opt_data_err_abort
, EXT4_MOUNT_DATA_ERR_ABORT
,
1588 {Opt_data_err_ignore
, EXT4_MOUNT_DATA_ERR_ABORT
,
1590 {Opt_barrier
, EXT4_MOUNT_BARRIER
, MOPT_SET
},
1591 {Opt_nobarrier
, EXT4_MOUNT_BARRIER
, MOPT_CLEAR
},
1592 {Opt_noauto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_SET
},
1593 {Opt_auto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_CLEAR
},
1594 {Opt_noinit_itable
, EXT4_MOUNT_INIT_INODE_TABLE
, MOPT_CLEAR
},
1595 {Opt_commit
, 0, MOPT_GTE0
},
1596 {Opt_max_batch_time
, 0, MOPT_GTE0
},
1597 {Opt_min_batch_time
, 0, MOPT_GTE0
},
1598 {Opt_inode_readahead_blks
, 0, MOPT_GTE0
},
1599 {Opt_init_itable
, 0, MOPT_GTE0
},
1600 {Opt_dax
, EXT4_MOUNT_DAX
, MOPT_SET
},
1601 {Opt_stripe
, 0, MOPT_GTE0
},
1602 {Opt_resuid
, 0, MOPT_GTE0
},
1603 {Opt_resgid
, 0, MOPT_GTE0
},
1604 {Opt_journal_dev
, 0, MOPT_NO_EXT2
| MOPT_GTE0
},
1605 {Opt_journal_path
, 0, MOPT_NO_EXT2
| MOPT_STRING
},
1606 {Opt_journal_ioprio
, 0, MOPT_NO_EXT2
| MOPT_GTE0
},
1607 {Opt_data_journal
, EXT4_MOUNT_JOURNAL_DATA
, MOPT_NO_EXT2
| MOPT_DATAJ
},
1608 {Opt_data_ordered
, EXT4_MOUNT_ORDERED_DATA
, MOPT_NO_EXT2
| MOPT_DATAJ
},
1609 {Opt_data_writeback
, EXT4_MOUNT_WRITEBACK_DATA
,
1610 MOPT_NO_EXT2
| MOPT_DATAJ
},
1611 {Opt_user_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_SET
},
1612 {Opt_nouser_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_CLEAR
},
1613 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1614 {Opt_acl
, EXT4_MOUNT_POSIX_ACL
, MOPT_SET
},
1615 {Opt_noacl
, EXT4_MOUNT_POSIX_ACL
, MOPT_CLEAR
},
1617 {Opt_acl
, 0, MOPT_NOSUPPORT
},
1618 {Opt_noacl
, 0, MOPT_NOSUPPORT
},
1620 {Opt_nouid32
, EXT4_MOUNT_NO_UID32
, MOPT_SET
},
1621 {Opt_debug
, EXT4_MOUNT_DEBUG
, MOPT_SET
},
1622 {Opt_debug_want_extra_isize
, 0, MOPT_GTE0
},
1623 {Opt_quota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
, MOPT_SET
| MOPT_Q
},
1624 {Opt_usrquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
,
1626 {Opt_grpquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_GRPQUOTA
,
1628 {Opt_prjquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_PRJQUOTA
,
1630 {Opt_noquota
, (EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
|
1631 EXT4_MOUNT_GRPQUOTA
| EXT4_MOUNT_PRJQUOTA
),
1632 MOPT_CLEAR
| MOPT_Q
},
1633 {Opt_usrjquota
, 0, MOPT_Q
},
1634 {Opt_grpjquota
, 0, MOPT_Q
},
1635 {Opt_offusrjquota
, 0, MOPT_Q
},
1636 {Opt_offgrpjquota
, 0, MOPT_Q
},
1637 {Opt_jqfmt_vfsold
, QFMT_VFS_OLD
, MOPT_QFMT
},
1638 {Opt_jqfmt_vfsv0
, QFMT_VFS_V0
, MOPT_QFMT
},
1639 {Opt_jqfmt_vfsv1
, QFMT_VFS_V1
, MOPT_QFMT
},
1640 {Opt_max_dir_size_kb
, 0, MOPT_GTE0
},
1641 {Opt_test_dummy_encryption
, 0, MOPT_GTE0
},
1642 {Opt_nombcache
, EXT4_MOUNT_NO_MBCACHE
, MOPT_SET
},
1646 static int handle_mount_opt(struct super_block
*sb
, char *opt
, int token
,
1647 substring_t
*args
, unsigned long *journal_devnum
,
1648 unsigned int *journal_ioprio
, int is_remount
)
1650 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1651 const struct mount_opts
*m
;
1657 if (token
== Opt_usrjquota
)
1658 return set_qf_name(sb
, USRQUOTA
, &args
[0]);
1659 else if (token
== Opt_grpjquota
)
1660 return set_qf_name(sb
, GRPQUOTA
, &args
[0]);
1661 else if (token
== Opt_offusrjquota
)
1662 return clear_qf_name(sb
, USRQUOTA
);
1663 else if (token
== Opt_offgrpjquota
)
1664 return clear_qf_name(sb
, GRPQUOTA
);
1668 case Opt_nouser_xattr
:
1669 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, opt
, "3.5");
1672 return 1; /* handled by get_sb_block() */
1674 ext4_msg(sb
, KERN_WARNING
, "Ignoring removed %s option", opt
);
1677 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1680 sb
->s_flags
|= SB_I_VERSION
;
1683 sb
->s_flags
|= MS_LAZYTIME
;
1685 case Opt_nolazytime
:
1686 sb
->s_flags
&= ~MS_LAZYTIME
;
1690 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++)
1691 if (token
== m
->token
)
1694 if (m
->token
== Opt_err
) {
1695 ext4_msg(sb
, KERN_ERR
, "Unrecognized mount option \"%s\" "
1696 "or missing value", opt
);
1700 if ((m
->flags
& MOPT_NO_EXT2
) && IS_EXT2_SB(sb
)) {
1701 ext4_msg(sb
, KERN_ERR
,
1702 "Mount option \"%s\" incompatible with ext2", opt
);
1705 if ((m
->flags
& MOPT_NO_EXT3
) && IS_EXT3_SB(sb
)) {
1706 ext4_msg(sb
, KERN_ERR
,
1707 "Mount option \"%s\" incompatible with ext3", opt
);
1711 if (args
->from
&& !(m
->flags
& MOPT_STRING
) && match_int(args
, &arg
))
1713 if (args
->from
&& (m
->flags
& MOPT_GTE0
) && (arg
< 0))
1715 if (m
->flags
& MOPT_EXPLICIT
) {
1716 if (m
->mount_opt
& EXT4_MOUNT_DELALLOC
) {
1717 set_opt2(sb
, EXPLICIT_DELALLOC
);
1718 } else if (m
->mount_opt
& EXT4_MOUNT_JOURNAL_CHECKSUM
) {
1719 set_opt2(sb
, EXPLICIT_JOURNAL_CHECKSUM
);
1723 if (m
->flags
& MOPT_CLEAR_ERR
)
1724 clear_opt(sb
, ERRORS_MASK
);
1725 if (token
== Opt_noquota
&& sb_any_quota_loaded(sb
)) {
1726 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1727 "options when quota turned on");
1731 if (m
->flags
& MOPT_NOSUPPORT
) {
1732 ext4_msg(sb
, KERN_ERR
, "%s option not supported", opt
);
1733 } else if (token
== Opt_commit
) {
1735 arg
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1736 sbi
->s_commit_interval
= HZ
* arg
;
1737 } else if (token
== Opt_debug_want_extra_isize
) {
1738 sbi
->s_want_extra_isize
= arg
;
1739 } else if (token
== Opt_max_batch_time
) {
1740 sbi
->s_max_batch_time
= arg
;
1741 } else if (token
== Opt_min_batch_time
) {
1742 sbi
->s_min_batch_time
= arg
;
1743 } else if (token
== Opt_inode_readahead_blks
) {
1744 if (arg
&& (arg
> (1 << 30) || !is_power_of_2(arg
))) {
1745 ext4_msg(sb
, KERN_ERR
,
1746 "EXT4-fs: inode_readahead_blks must be "
1747 "0 or a power of 2 smaller than 2^31");
1750 sbi
->s_inode_readahead_blks
= arg
;
1751 } else if (token
== Opt_init_itable
) {
1752 set_opt(sb
, INIT_INODE_TABLE
);
1754 arg
= EXT4_DEF_LI_WAIT_MULT
;
1755 sbi
->s_li_wait_mult
= arg
;
1756 } else if (token
== Opt_max_dir_size_kb
) {
1757 sbi
->s_max_dir_size_kb
= arg
;
1758 } else if (token
== Opt_stripe
) {
1759 sbi
->s_stripe
= arg
;
1760 } else if (token
== Opt_resuid
) {
1761 uid
= make_kuid(current_user_ns(), arg
);
1762 if (!uid_valid(uid
)) {
1763 ext4_msg(sb
, KERN_ERR
, "Invalid uid value %d", arg
);
1766 sbi
->s_resuid
= uid
;
1767 } else if (token
== Opt_resgid
) {
1768 gid
= make_kgid(current_user_ns(), arg
);
1769 if (!gid_valid(gid
)) {
1770 ext4_msg(sb
, KERN_ERR
, "Invalid gid value %d", arg
);
1773 sbi
->s_resgid
= gid
;
1774 } else if (token
== Opt_journal_dev
) {
1776 ext4_msg(sb
, KERN_ERR
,
1777 "Cannot specify journal on remount");
1780 *journal_devnum
= arg
;
1781 } else if (token
== Opt_journal_path
) {
1783 struct inode
*journal_inode
;
1788 ext4_msg(sb
, KERN_ERR
,
1789 "Cannot specify journal on remount");
1792 journal_path
= match_strdup(&args
[0]);
1793 if (!journal_path
) {
1794 ext4_msg(sb
, KERN_ERR
, "error: could not dup "
1795 "journal device string");
1799 error
= kern_path(journal_path
, LOOKUP_FOLLOW
, &path
);
1801 ext4_msg(sb
, KERN_ERR
, "error: could not find "
1802 "journal device path: error %d", error
);
1803 kfree(journal_path
);
1807 journal_inode
= d_inode(path
.dentry
);
1808 if (!S_ISBLK(journal_inode
->i_mode
)) {
1809 ext4_msg(sb
, KERN_ERR
, "error: journal path %s "
1810 "is not a block device", journal_path
);
1812 kfree(journal_path
);
1816 *journal_devnum
= new_encode_dev(journal_inode
->i_rdev
);
1818 kfree(journal_path
);
1819 } else if (token
== Opt_journal_ioprio
) {
1821 ext4_msg(sb
, KERN_ERR
, "Invalid journal IO priority"
1826 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
, arg
);
1827 } else if (token
== Opt_test_dummy_encryption
) {
1828 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1829 sbi
->s_mount_flags
|= EXT4_MF_TEST_DUMMY_ENCRYPTION
;
1830 ext4_msg(sb
, KERN_WARNING
,
1831 "Test dummy encryption mode enabled");
1833 ext4_msg(sb
, KERN_WARNING
,
1834 "Test dummy encryption mount option ignored");
1836 } else if (m
->flags
& MOPT_DATAJ
) {
1838 if (!sbi
->s_journal
)
1839 ext4_msg(sb
, KERN_WARNING
, "Remounting file system with no journal so ignoring journalled data option");
1840 else if (test_opt(sb
, DATA_FLAGS
) != m
->mount_opt
) {
1841 ext4_msg(sb
, KERN_ERR
,
1842 "Cannot change data mode on remount");
1846 clear_opt(sb
, DATA_FLAGS
);
1847 sbi
->s_mount_opt
|= m
->mount_opt
;
1850 } else if (m
->flags
& MOPT_QFMT
) {
1851 if (sb_any_quota_loaded(sb
) &&
1852 sbi
->s_jquota_fmt
!= m
->mount_opt
) {
1853 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled "
1854 "quota options when quota turned on");
1857 if (ext4_has_feature_quota(sb
)) {
1858 ext4_msg(sb
, KERN_INFO
,
1859 "Quota format mount options ignored "
1860 "when QUOTA feature is enabled");
1863 sbi
->s_jquota_fmt
= m
->mount_opt
;
1865 } else if (token
== Opt_dax
) {
1866 #ifdef CONFIG_FS_DAX
1867 ext4_msg(sb
, KERN_WARNING
,
1868 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1869 sbi
->s_mount_opt
|= m
->mount_opt
;
1871 ext4_msg(sb
, KERN_INFO
, "dax option not supported");
1874 } else if (token
== Opt_data_err_abort
) {
1875 sbi
->s_mount_opt
|= m
->mount_opt
;
1876 } else if (token
== Opt_data_err_ignore
) {
1877 sbi
->s_mount_opt
&= ~m
->mount_opt
;
1881 if (m
->flags
& MOPT_CLEAR
)
1883 else if (unlikely(!(m
->flags
& MOPT_SET
))) {
1884 ext4_msg(sb
, KERN_WARNING
,
1885 "buggy handling of option %s", opt
);
1890 sbi
->s_mount_opt
|= m
->mount_opt
;
1892 sbi
->s_mount_opt
&= ~m
->mount_opt
;
1897 static int parse_options(char *options
, struct super_block
*sb
,
1898 unsigned long *journal_devnum
,
1899 unsigned int *journal_ioprio
,
1902 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1904 substring_t args
[MAX_OPT_ARGS
];
1910 while ((p
= strsep(&options
, ",")) != NULL
) {
1914 * Initialize args struct so we know whether arg was
1915 * found; some options take optional arguments.
1917 args
[0].to
= args
[0].from
= NULL
;
1918 token
= match_token(p
, tokens
, args
);
1919 if (handle_mount_opt(sb
, p
, token
, args
, journal_devnum
,
1920 journal_ioprio
, is_remount
) < 0)
1925 * We do the test below only for project quotas. 'usrquota' and
1926 * 'grpquota' mount options are allowed even without quota feature
1927 * to support legacy quotas in quota files.
1929 if (test_opt(sb
, PRJQUOTA
) && !ext4_has_feature_project(sb
)) {
1930 ext4_msg(sb
, KERN_ERR
, "Project quota feature not enabled. "
1931 "Cannot enable project quota enforcement.");
1934 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1935 if (test_opt(sb
, USRQUOTA
) && sbi
->s_qf_names
[USRQUOTA
])
1936 clear_opt(sb
, USRQUOTA
);
1938 if (test_opt(sb
, GRPQUOTA
) && sbi
->s_qf_names
[GRPQUOTA
])
1939 clear_opt(sb
, GRPQUOTA
);
1941 if (test_opt(sb
, GRPQUOTA
) || test_opt(sb
, USRQUOTA
)) {
1942 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1947 if (!sbi
->s_jquota_fmt
) {
1948 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1954 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
1956 BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
1958 if (blocksize
< PAGE_SIZE
) {
1959 ext4_msg(sb
, KERN_ERR
, "can't mount with "
1960 "dioread_nolock if block size != PAGE_SIZE");
1967 static inline void ext4_show_quota_options(struct seq_file
*seq
,
1968 struct super_block
*sb
)
1970 #if defined(CONFIG_QUOTA)
1971 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1973 if (sbi
->s_jquota_fmt
) {
1976 switch (sbi
->s_jquota_fmt
) {
1987 seq_printf(seq
, ",jqfmt=%s", fmtname
);
1990 if (sbi
->s_qf_names
[USRQUOTA
])
1991 seq_show_option(seq
, "usrjquota", sbi
->s_qf_names
[USRQUOTA
]);
1993 if (sbi
->s_qf_names
[GRPQUOTA
])
1994 seq_show_option(seq
, "grpjquota", sbi
->s_qf_names
[GRPQUOTA
]);
1998 static const char *token2str(int token
)
2000 const struct match_token
*t
;
2002 for (t
= tokens
; t
->token
!= Opt_err
; t
++)
2003 if (t
->token
== token
&& !strchr(t
->pattern
, '='))
2010 * - it's set to a non-default value OR
2011 * - if the per-sb default is different from the global default
2013 static int _ext4_show_options(struct seq_file
*seq
, struct super_block
*sb
,
2016 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2017 struct ext4_super_block
*es
= sbi
->s_es
;
2018 int def_errors
, def_mount_opt
= nodefs
? 0 : sbi
->s_def_mount_opt
;
2019 const struct mount_opts
*m
;
2020 char sep
= nodefs
? '\n' : ',';
2022 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2023 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2025 if (sbi
->s_sb_block
!= 1)
2026 SEQ_OPTS_PRINT("sb=%llu", sbi
->s_sb_block
);
2028 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++) {
2029 int want_set
= m
->flags
& MOPT_SET
;
2030 if (((m
->flags
& (MOPT_SET
|MOPT_CLEAR
)) == 0) ||
2031 (m
->flags
& MOPT_CLEAR_ERR
))
2033 if (!(m
->mount_opt
& (sbi
->s_mount_opt
^ def_mount_opt
)))
2034 continue; /* skip if same as the default */
2036 (sbi
->s_mount_opt
& m
->mount_opt
) != m
->mount_opt
) ||
2037 (!want_set
&& (sbi
->s_mount_opt
& m
->mount_opt
)))
2038 continue; /* select Opt_noFoo vs Opt_Foo */
2039 SEQ_OPTS_PRINT("%s", token2str(m
->token
));
2042 if (nodefs
|| !uid_eq(sbi
->s_resuid
, make_kuid(&init_user_ns
, EXT4_DEF_RESUID
)) ||
2043 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
)
2044 SEQ_OPTS_PRINT("resuid=%u",
2045 from_kuid_munged(&init_user_ns
, sbi
->s_resuid
));
2046 if (nodefs
|| !gid_eq(sbi
->s_resgid
, make_kgid(&init_user_ns
, EXT4_DEF_RESGID
)) ||
2047 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
)
2048 SEQ_OPTS_PRINT("resgid=%u",
2049 from_kgid_munged(&init_user_ns
, sbi
->s_resgid
));
2050 def_errors
= nodefs
? -1 : le16_to_cpu(es
->s_errors
);
2051 if (test_opt(sb
, ERRORS_RO
) && def_errors
!= EXT4_ERRORS_RO
)
2052 SEQ_OPTS_PUTS("errors=remount-ro");
2053 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
2054 SEQ_OPTS_PUTS("errors=continue");
2055 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
2056 SEQ_OPTS_PUTS("errors=panic");
2057 if (nodefs
|| sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
)
2058 SEQ_OPTS_PRINT("commit=%lu", sbi
->s_commit_interval
/ HZ
);
2059 if (nodefs
|| sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
)
2060 SEQ_OPTS_PRINT("min_batch_time=%u", sbi
->s_min_batch_time
);
2061 if (nodefs
|| sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
)
2062 SEQ_OPTS_PRINT("max_batch_time=%u", sbi
->s_max_batch_time
);
2063 if (sb
->s_flags
& SB_I_VERSION
)
2064 SEQ_OPTS_PUTS("i_version");
2065 if (nodefs
|| sbi
->s_stripe
)
2066 SEQ_OPTS_PRINT("stripe=%lu", sbi
->s_stripe
);
2067 if (EXT4_MOUNT_DATA_FLAGS
& (sbi
->s_mount_opt
^ def_mount_opt
)) {
2068 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
2069 SEQ_OPTS_PUTS("data=journal");
2070 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
2071 SEQ_OPTS_PUTS("data=ordered");
2072 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
2073 SEQ_OPTS_PUTS("data=writeback");
2076 sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
2077 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2078 sbi
->s_inode_readahead_blks
);
2080 if (nodefs
|| (test_opt(sb
, INIT_INODE_TABLE
) &&
2081 (sbi
->s_li_wait_mult
!= EXT4_DEF_LI_WAIT_MULT
)))
2082 SEQ_OPTS_PRINT("init_itable=%u", sbi
->s_li_wait_mult
);
2083 if (nodefs
|| sbi
->s_max_dir_size_kb
)
2084 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi
->s_max_dir_size_kb
);
2085 if (test_opt(sb
, DATA_ERR_ABORT
))
2086 SEQ_OPTS_PUTS("data_err=abort");
2088 ext4_show_quota_options(seq
, sb
);
2092 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
)
2094 return _ext4_show_options(seq
, root
->d_sb
, 0);
2097 int ext4_seq_options_show(struct seq_file
*seq
, void *offset
)
2099 struct super_block
*sb
= seq
->private;
2102 seq_puts(seq
, sb_rdonly(sb
) ? "ro" : "rw");
2103 rc
= _ext4_show_options(seq
, sb
, 1);
2104 seq_puts(seq
, "\n");
2108 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
2111 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2114 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
2115 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
2116 "forcing read-only mode");
2121 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
2122 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
2123 "running e2fsck is recommended");
2124 else if (sbi
->s_mount_state
& EXT4_ERROR_FS
)
2125 ext4_msg(sb
, KERN_WARNING
,
2126 "warning: mounting fs with errors, "
2127 "running e2fsck is recommended");
2128 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) > 0 &&
2129 le16_to_cpu(es
->s_mnt_count
) >=
2130 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
2131 ext4_msg(sb
, KERN_WARNING
,
2132 "warning: maximal mount count reached, "
2133 "running e2fsck is recommended");
2134 else if (le32_to_cpu(es
->s_checkinterval
) &&
2135 (le32_to_cpu(es
->s_lastcheck
) +
2136 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
2137 ext4_msg(sb
, KERN_WARNING
,
2138 "warning: checktime reached, "
2139 "running e2fsck is recommended");
2140 if (!sbi
->s_journal
)
2141 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
2142 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
2143 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
2144 le16_add_cpu(&es
->s_mnt_count
, 1);
2145 es
->s_mtime
= cpu_to_le32(get_seconds());
2146 ext4_update_dynamic_rev(sb
);
2148 ext4_set_feature_journal_needs_recovery(sb
);
2150 ext4_commit_super(sb
, 1);
2152 if (test_opt(sb
, DEBUG
))
2153 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
2154 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
2156 sbi
->s_groups_count
,
2157 EXT4_BLOCKS_PER_GROUP(sb
),
2158 EXT4_INODES_PER_GROUP(sb
),
2159 sbi
->s_mount_opt
, sbi
->s_mount_opt2
);
2161 cleancache_init_fs(sb
);
2165 int ext4_alloc_flex_bg_array(struct super_block
*sb
, ext4_group_t ngroup
)
2167 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2168 struct flex_groups
*new_groups
;
2171 if (!sbi
->s_log_groups_per_flex
)
2174 size
= ext4_flex_group(sbi
, ngroup
- 1) + 1;
2175 if (size
<= sbi
->s_flex_groups_allocated
)
2178 size
= roundup_pow_of_two(size
* sizeof(struct flex_groups
));
2179 new_groups
= kvzalloc(size
, GFP_KERNEL
);
2181 ext4_msg(sb
, KERN_ERR
, "not enough memory for %d flex groups",
2182 size
/ (int) sizeof(struct flex_groups
));
2186 if (sbi
->s_flex_groups
) {
2187 memcpy(new_groups
, sbi
->s_flex_groups
,
2188 (sbi
->s_flex_groups_allocated
*
2189 sizeof(struct flex_groups
)));
2190 kvfree(sbi
->s_flex_groups
);
2192 sbi
->s_flex_groups
= new_groups
;
2193 sbi
->s_flex_groups_allocated
= size
/ sizeof(struct flex_groups
);
2197 static int ext4_fill_flex_info(struct super_block
*sb
)
2199 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2200 struct ext4_group_desc
*gdp
= NULL
;
2201 ext4_group_t flex_group
;
2204 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
2205 if (sbi
->s_log_groups_per_flex
< 1 || sbi
->s_log_groups_per_flex
> 31) {
2206 sbi
->s_log_groups_per_flex
= 0;
2210 err
= ext4_alloc_flex_bg_array(sb
, sbi
->s_groups_count
);
2214 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
2215 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2217 flex_group
= ext4_flex_group(sbi
, i
);
2218 atomic_add(ext4_free_inodes_count(sb
, gdp
),
2219 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
2220 atomic64_add(ext4_free_group_clusters(sb
, gdp
),
2221 &sbi
->s_flex_groups
[flex_group
].free_clusters
);
2222 atomic_add(ext4_used_dirs_count(sb
, gdp
),
2223 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
2231 static __le16
ext4_group_desc_csum(struct super_block
*sb
, __u32 block_group
,
2232 struct ext4_group_desc
*gdp
)
2234 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
2236 __le32 le_group
= cpu_to_le32(block_group
);
2237 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2239 if (ext4_has_metadata_csum(sbi
->s_sb
)) {
2240 /* Use new metadata_csum algorithm */
2242 __u16 dummy_csum
= 0;
2244 csum32
= ext4_chksum(sbi
, sbi
->s_csum_seed
, (__u8
*)&le_group
,
2246 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)gdp
, offset
);
2247 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)&dummy_csum
,
2248 sizeof(dummy_csum
));
2249 offset
+= sizeof(dummy_csum
);
2250 if (offset
< sbi
->s_desc_size
)
2251 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)gdp
+ offset
,
2252 sbi
->s_desc_size
- offset
);
2254 crc
= csum32
& 0xFFFF;
2258 /* old crc16 code */
2259 if (!ext4_has_feature_gdt_csum(sb
))
2262 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
2263 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
2264 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
2265 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
2266 /* for checksum of struct ext4_group_desc do the rest...*/
2267 if (ext4_has_feature_64bit(sb
) &&
2268 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
2269 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
2270 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
2274 return cpu_to_le16(crc
);
2277 int ext4_group_desc_csum_verify(struct super_block
*sb
, __u32 block_group
,
2278 struct ext4_group_desc
*gdp
)
2280 if (ext4_has_group_desc_csum(sb
) &&
2281 (gdp
->bg_checksum
!= ext4_group_desc_csum(sb
, block_group
, gdp
)))
2287 void ext4_group_desc_csum_set(struct super_block
*sb
, __u32 block_group
,
2288 struct ext4_group_desc
*gdp
)
2290 if (!ext4_has_group_desc_csum(sb
))
2292 gdp
->bg_checksum
= ext4_group_desc_csum(sb
, block_group
, gdp
);
2295 /* Called at mount-time, super-block is locked */
2296 static int ext4_check_descriptors(struct super_block
*sb
,
2297 ext4_fsblk_t sb_block
,
2298 ext4_group_t
*first_not_zeroed
)
2300 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2301 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
2302 ext4_fsblk_t last_block
;
2303 ext4_fsblk_t block_bitmap
;
2304 ext4_fsblk_t inode_bitmap
;
2305 ext4_fsblk_t inode_table
;
2306 int flexbg_flag
= 0;
2307 ext4_group_t i
, grp
= sbi
->s_groups_count
;
2309 if (ext4_has_feature_flex_bg(sb
))
2312 ext4_debug("Checking group descriptors");
2314 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
2315 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2317 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
2318 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
2320 last_block
= first_block
+
2321 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2323 if ((grp
== sbi
->s_groups_count
) &&
2324 !(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2327 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
2328 if (block_bitmap
== sb_block
) {
2329 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2330 "Block bitmap for group %u overlaps "
2333 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
2334 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2335 "Block bitmap for group %u not in group "
2336 "(block %llu)!", i
, block_bitmap
);
2339 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
2340 if (inode_bitmap
== sb_block
) {
2341 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2342 "Inode bitmap for group %u overlaps "
2345 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
2346 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2347 "Inode bitmap for group %u not in group "
2348 "(block %llu)!", i
, inode_bitmap
);
2351 inode_table
= ext4_inode_table(sb
, gdp
);
2352 if (inode_table
== sb_block
) {
2353 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2354 "Inode table for group %u overlaps "
2357 if (inode_table
< first_block
||
2358 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
2359 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2360 "Inode table for group %u not in group "
2361 "(block %llu)!", i
, inode_table
);
2364 ext4_lock_group(sb
, i
);
2365 if (!ext4_group_desc_csum_verify(sb
, i
, gdp
)) {
2366 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2367 "Checksum for group %u failed (%u!=%u)",
2368 i
, le16_to_cpu(ext4_group_desc_csum(sb
, i
,
2369 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
2370 if (!sb_rdonly(sb
)) {
2371 ext4_unlock_group(sb
, i
);
2375 ext4_unlock_group(sb
, i
);
2377 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
2379 if (NULL
!= first_not_zeroed
)
2380 *first_not_zeroed
= grp
;
2384 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2385 * the superblock) which were deleted from all directories, but held open by
2386 * a process at the time of a crash. We walk the list and try to delete these
2387 * inodes at recovery time (only with a read-write filesystem).
2389 * In order to keep the orphan inode chain consistent during traversal (in
2390 * case of crash during recovery), we link each inode into the superblock
2391 * orphan list_head and handle it the same way as an inode deletion during
2392 * normal operation (which journals the operations for us).
2394 * We only do an iget() and an iput() on each inode, which is very safe if we
2395 * accidentally point at an in-use or already deleted inode. The worst that
2396 * can happen in this case is that we get a "bit already cleared" message from
2397 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2398 * e2fsck was run on this filesystem, and it must have already done the orphan
2399 * inode cleanup for us, so we can safely abort without any further action.
2401 static void ext4_orphan_cleanup(struct super_block
*sb
,
2402 struct ext4_super_block
*es
)
2404 unsigned int s_flags
= sb
->s_flags
;
2405 int ret
, nr_orphans
= 0, nr_truncates
= 0;
2407 int quota_update
= 0;
2410 if (!es
->s_last_orphan
) {
2411 jbd_debug(4, "no orphan inodes to clean up\n");
2415 if (bdev_read_only(sb
->s_bdev
)) {
2416 ext4_msg(sb
, KERN_ERR
, "write access "
2417 "unavailable, skipping orphan cleanup");
2421 /* Check if feature set would not allow a r/w mount */
2422 if (!ext4_feature_set_ok(sb
, 0)) {
2423 ext4_msg(sb
, KERN_INFO
, "Skipping orphan cleanup due to "
2424 "unknown ROCOMPAT features");
2428 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2429 /* don't clear list on RO mount w/ errors */
2430 if (es
->s_last_orphan
&& !(s_flags
& MS_RDONLY
)) {
2431 ext4_msg(sb
, KERN_INFO
, "Errors on filesystem, "
2432 "clearing orphan list.\n");
2433 es
->s_last_orphan
= 0;
2435 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2439 if (s_flags
& MS_RDONLY
) {
2440 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
2441 sb
->s_flags
&= ~MS_RDONLY
;
2444 /* Needed for iput() to work correctly and not trash data */
2445 sb
->s_flags
|= MS_ACTIVE
;
2448 * Turn on quotas which were not enabled for read-only mounts if
2449 * filesystem has quota feature, so that they are updated correctly.
2451 if (ext4_has_feature_quota(sb
) && (s_flags
& MS_RDONLY
)) {
2452 int ret
= ext4_enable_quotas(sb
);
2457 ext4_msg(sb
, KERN_ERR
,
2458 "Cannot turn on quotas: error %d", ret
);
2461 /* Turn on journaled quotas used for old sytle */
2462 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++) {
2463 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
2464 int ret
= ext4_quota_on_mount(sb
, i
);
2469 ext4_msg(sb
, KERN_ERR
,
2470 "Cannot turn on journaled "
2471 "quota: type %d: error %d", i
, ret
);
2476 while (es
->s_last_orphan
) {
2477 struct inode
*inode
;
2480 * We may have encountered an error during cleanup; if
2481 * so, skip the rest.
2483 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2484 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2485 es
->s_last_orphan
= 0;
2489 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
2490 if (IS_ERR(inode
)) {
2491 es
->s_last_orphan
= 0;
2495 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
2496 dquot_initialize(inode
);
2497 if (inode
->i_nlink
) {
2498 if (test_opt(sb
, DEBUG
))
2499 ext4_msg(sb
, KERN_DEBUG
,
2500 "%s: truncating inode %lu to %lld bytes",
2501 __func__
, inode
->i_ino
, inode
->i_size
);
2502 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2503 inode
->i_ino
, inode
->i_size
);
2505 truncate_inode_pages(inode
->i_mapping
, inode
->i_size
);
2506 ret
= ext4_truncate(inode
);
2508 ext4_std_error(inode
->i_sb
, ret
);
2509 inode_unlock(inode
);
2512 if (test_opt(sb
, DEBUG
))
2513 ext4_msg(sb
, KERN_DEBUG
,
2514 "%s: deleting unreferenced inode %lu",
2515 __func__
, inode
->i_ino
);
2516 jbd_debug(2, "deleting unreferenced inode %lu\n",
2520 iput(inode
); /* The delete magic happens here! */
2523 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2526 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
2527 PLURAL(nr_orphans
));
2529 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
2530 PLURAL(nr_truncates
));
2532 /* Turn off quotas if they were enabled for orphan cleanup */
2534 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++) {
2535 if (sb_dqopt(sb
)->files
[i
])
2536 dquot_quota_off(sb
, i
);
2540 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
2544 * Maximal extent format file size.
2545 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2546 * extent format containers, within a sector_t, and within i_blocks
2547 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2548 * so that won't be a limiting factor.
2550 * However there is other limiting factor. We do store extents in the form
2551 * of starting block and length, hence the resulting length of the extent
2552 * covering maximum file size must fit into on-disk format containers as
2553 * well. Given that length is always by 1 unit bigger than max unit (because
2554 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2556 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2558 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
2561 loff_t upper_limit
= MAX_LFS_FILESIZE
;
2563 /* small i_blocks in vfs inode? */
2564 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2566 * CONFIG_LBDAF is not enabled implies the inode
2567 * i_block represent total blocks in 512 bytes
2568 * 32 == size of vfs inode i_blocks * 8
2570 upper_limit
= (1LL << 32) - 1;
2572 /* total blocks in file system block size */
2573 upper_limit
>>= (blkbits
- 9);
2574 upper_limit
<<= blkbits
;
2578 * 32-bit extent-start container, ee_block. We lower the maxbytes
2579 * by one fs block, so ee_len can cover the extent of maximum file
2582 res
= (1LL << 32) - 1;
2585 /* Sanity check against vm- & vfs- imposed limits */
2586 if (res
> upper_limit
)
2593 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2594 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2595 * We need to be 1 filesystem block less than the 2^48 sector limit.
2597 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2599 loff_t res
= EXT4_NDIR_BLOCKS
;
2602 /* This is calculated to be the largest file size for a dense, block
2603 * mapped file such that the file's total number of 512-byte sectors,
2604 * including data and all indirect blocks, does not exceed (2^48 - 1).
2606 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2607 * number of 512-byte sectors of the file.
2610 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2612 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2613 * the inode i_block field represents total file blocks in
2614 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2616 upper_limit
= (1LL << 32) - 1;
2618 /* total blocks in file system block size */
2619 upper_limit
>>= (bits
- 9);
2623 * We use 48 bit ext4_inode i_blocks
2624 * With EXT4_HUGE_FILE_FL set the i_blocks
2625 * represent total number of blocks in
2626 * file system block size
2628 upper_limit
= (1LL << 48) - 1;
2632 /* indirect blocks */
2634 /* double indirect blocks */
2635 meta_blocks
+= 1 + (1LL << (bits
-2));
2636 /* tripple indirect blocks */
2637 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2639 upper_limit
-= meta_blocks
;
2640 upper_limit
<<= bits
;
2642 res
+= 1LL << (bits
-2);
2643 res
+= 1LL << (2*(bits
-2));
2644 res
+= 1LL << (3*(bits
-2));
2646 if (res
> upper_limit
)
2649 if (res
> MAX_LFS_FILESIZE
)
2650 res
= MAX_LFS_FILESIZE
;
2655 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2656 ext4_fsblk_t logical_sb_block
, int nr
)
2658 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2659 ext4_group_t bg
, first_meta_bg
;
2662 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2664 if (!ext4_has_feature_meta_bg(sb
) || nr
< first_meta_bg
)
2665 return logical_sb_block
+ nr
+ 1;
2666 bg
= sbi
->s_desc_per_block
* nr
;
2667 if (ext4_bg_has_super(sb
, bg
))
2671 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2672 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2673 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2676 if (sb
->s_blocksize
== 1024 && nr
== 0 &&
2677 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_first_data_block
) == 0)
2680 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2684 * ext4_get_stripe_size: Get the stripe size.
2685 * @sbi: In memory super block info
2687 * If we have specified it via mount option, then
2688 * use the mount option value. If the value specified at mount time is
2689 * greater than the blocks per group use the super block value.
2690 * If the super block value is greater than blocks per group return 0.
2691 * Allocator needs it be less than blocks per group.
2694 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2696 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2697 unsigned long stripe_width
=
2698 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2701 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2702 ret
= sbi
->s_stripe
;
2703 else if (stripe_width
&& stripe_width
<= sbi
->s_blocks_per_group
)
2705 else if (stride
&& stride
<= sbi
->s_blocks_per_group
)
2711 * If the stripe width is 1, this makes no sense and
2712 * we set it to 0 to turn off stripe handling code.
2721 * Check whether this filesystem can be mounted based on
2722 * the features present and the RDONLY/RDWR mount requested.
2723 * Returns 1 if this filesystem can be mounted as requested,
2724 * 0 if it cannot be.
2726 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2728 if (ext4_has_unknown_ext4_incompat_features(sb
)) {
2729 ext4_msg(sb
, KERN_ERR
,
2730 "Couldn't mount because of "
2731 "unsupported optional features (%x)",
2732 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2733 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2740 if (ext4_has_feature_readonly(sb
)) {
2741 ext4_msg(sb
, KERN_INFO
, "filesystem is read-only");
2742 sb
->s_flags
|= MS_RDONLY
;
2746 /* Check that feature set is OK for a read-write mount */
2747 if (ext4_has_unknown_ext4_ro_compat_features(sb
)) {
2748 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2749 "unsupported optional features (%x)",
2750 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2751 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2755 * Large file size enabled file system can only be mounted
2756 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2758 if (ext4_has_feature_huge_file(sb
)) {
2759 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2760 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2761 "cannot be mounted RDWR without "
2766 if (ext4_has_feature_bigalloc(sb
) && !ext4_has_feature_extents(sb
)) {
2767 ext4_msg(sb
, KERN_ERR
,
2768 "Can't support bigalloc feature without "
2769 "extents feature\n");
2773 #ifndef CONFIG_QUOTA
2774 if (ext4_has_feature_quota(sb
) && !readonly
) {
2775 ext4_msg(sb
, KERN_ERR
,
2776 "Filesystem with quota feature cannot be mounted RDWR "
2777 "without CONFIG_QUOTA");
2780 if (ext4_has_feature_project(sb
) && !readonly
) {
2781 ext4_msg(sb
, KERN_ERR
,
2782 "Filesystem with project quota feature cannot be mounted RDWR "
2783 "without CONFIG_QUOTA");
2786 #endif /* CONFIG_QUOTA */
2791 * This function is called once a day if we have errors logged
2792 * on the file system
2794 static void print_daily_error_info(unsigned long arg
)
2796 struct super_block
*sb
= (struct super_block
*) arg
;
2797 struct ext4_sb_info
*sbi
;
2798 struct ext4_super_block
*es
;
2803 if (es
->s_error_count
)
2804 /* fsck newer than v1.41.13 is needed to clean this condition. */
2805 ext4_msg(sb
, KERN_NOTICE
, "error count since last fsck: %u",
2806 le32_to_cpu(es
->s_error_count
));
2807 if (es
->s_first_error_time
) {
2808 printk(KERN_NOTICE
"EXT4-fs (%s): initial error at time %u: %.*s:%d",
2809 sb
->s_id
, le32_to_cpu(es
->s_first_error_time
),
2810 (int) sizeof(es
->s_first_error_func
),
2811 es
->s_first_error_func
,
2812 le32_to_cpu(es
->s_first_error_line
));
2813 if (es
->s_first_error_ino
)
2814 printk(KERN_CONT
": inode %u",
2815 le32_to_cpu(es
->s_first_error_ino
));
2816 if (es
->s_first_error_block
)
2817 printk(KERN_CONT
": block %llu", (unsigned long long)
2818 le64_to_cpu(es
->s_first_error_block
));
2819 printk(KERN_CONT
"\n");
2821 if (es
->s_last_error_time
) {
2822 printk(KERN_NOTICE
"EXT4-fs (%s): last error at time %u: %.*s:%d",
2823 sb
->s_id
, le32_to_cpu(es
->s_last_error_time
),
2824 (int) sizeof(es
->s_last_error_func
),
2825 es
->s_last_error_func
,
2826 le32_to_cpu(es
->s_last_error_line
));
2827 if (es
->s_last_error_ino
)
2828 printk(KERN_CONT
": inode %u",
2829 le32_to_cpu(es
->s_last_error_ino
));
2830 if (es
->s_last_error_block
)
2831 printk(KERN_CONT
": block %llu", (unsigned long long)
2832 le64_to_cpu(es
->s_last_error_block
));
2833 printk(KERN_CONT
"\n");
2835 mod_timer(&sbi
->s_err_report
, jiffies
+ 24*60*60*HZ
); /* Once a day */
2838 /* Find next suitable group and run ext4_init_inode_table */
2839 static int ext4_run_li_request(struct ext4_li_request
*elr
)
2841 struct ext4_group_desc
*gdp
= NULL
;
2842 ext4_group_t group
, ngroups
;
2843 struct super_block
*sb
;
2844 unsigned long timeout
= 0;
2848 ngroups
= EXT4_SB(sb
)->s_groups_count
;
2850 for (group
= elr
->lr_next_group
; group
< ngroups
; group
++) {
2851 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2857 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2861 if (group
>= ngroups
)
2866 ret
= ext4_init_inode_table(sb
, group
,
2867 elr
->lr_timeout
? 0 : 1);
2868 if (elr
->lr_timeout
== 0) {
2869 timeout
= (jiffies
- timeout
) *
2870 elr
->lr_sbi
->s_li_wait_mult
;
2871 elr
->lr_timeout
= timeout
;
2873 elr
->lr_next_sched
= jiffies
+ elr
->lr_timeout
;
2874 elr
->lr_next_group
= group
+ 1;
2880 * Remove lr_request from the list_request and free the
2881 * request structure. Should be called with li_list_mtx held
2883 static void ext4_remove_li_request(struct ext4_li_request
*elr
)
2885 struct ext4_sb_info
*sbi
;
2892 list_del(&elr
->lr_request
);
2893 sbi
->s_li_request
= NULL
;
2897 static void ext4_unregister_li_request(struct super_block
*sb
)
2899 mutex_lock(&ext4_li_mtx
);
2900 if (!ext4_li_info
) {
2901 mutex_unlock(&ext4_li_mtx
);
2905 mutex_lock(&ext4_li_info
->li_list_mtx
);
2906 ext4_remove_li_request(EXT4_SB(sb
)->s_li_request
);
2907 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2908 mutex_unlock(&ext4_li_mtx
);
2911 static struct task_struct
*ext4_lazyinit_task
;
2914 * This is the function where ext4lazyinit thread lives. It walks
2915 * through the request list searching for next scheduled filesystem.
2916 * When such a fs is found, run the lazy initialization request
2917 * (ext4_rn_li_request) and keep track of the time spend in this
2918 * function. Based on that time we compute next schedule time of
2919 * the request. When walking through the list is complete, compute
2920 * next waking time and put itself into sleep.
2922 static int ext4_lazyinit_thread(void *arg
)
2924 struct ext4_lazy_init
*eli
= (struct ext4_lazy_init
*)arg
;
2925 struct list_head
*pos
, *n
;
2926 struct ext4_li_request
*elr
;
2927 unsigned long next_wakeup
, cur
;
2929 BUG_ON(NULL
== eli
);
2933 next_wakeup
= MAX_JIFFY_OFFSET
;
2935 mutex_lock(&eli
->li_list_mtx
);
2936 if (list_empty(&eli
->li_request_list
)) {
2937 mutex_unlock(&eli
->li_list_mtx
);
2940 list_for_each_safe(pos
, n
, &eli
->li_request_list
) {
2943 elr
= list_entry(pos
, struct ext4_li_request
,
2946 if (time_before(jiffies
, elr
->lr_next_sched
)) {
2947 if (time_before(elr
->lr_next_sched
, next_wakeup
))
2948 next_wakeup
= elr
->lr_next_sched
;
2951 if (down_read_trylock(&elr
->lr_super
->s_umount
)) {
2952 if (sb_start_write_trylock(elr
->lr_super
)) {
2955 * We hold sb->s_umount, sb can not
2956 * be removed from the list, it is
2957 * now safe to drop li_list_mtx
2959 mutex_unlock(&eli
->li_list_mtx
);
2960 err
= ext4_run_li_request(elr
);
2961 sb_end_write(elr
->lr_super
);
2962 mutex_lock(&eli
->li_list_mtx
);
2965 up_read((&elr
->lr_super
->s_umount
));
2967 /* error, remove the lazy_init job */
2969 ext4_remove_li_request(elr
);
2973 elr
->lr_next_sched
= jiffies
+
2975 % (EXT4_DEF_LI_MAX_START_DELAY
* HZ
));
2977 if (time_before(elr
->lr_next_sched
, next_wakeup
))
2978 next_wakeup
= elr
->lr_next_sched
;
2980 mutex_unlock(&eli
->li_list_mtx
);
2985 if ((time_after_eq(cur
, next_wakeup
)) ||
2986 (MAX_JIFFY_OFFSET
== next_wakeup
)) {
2991 schedule_timeout_interruptible(next_wakeup
- cur
);
2993 if (kthread_should_stop()) {
2994 ext4_clear_request_list();
3001 * It looks like the request list is empty, but we need
3002 * to check it under the li_list_mtx lock, to prevent any
3003 * additions into it, and of course we should lock ext4_li_mtx
3004 * to atomically free the list and ext4_li_info, because at
3005 * this point another ext4 filesystem could be registering
3008 mutex_lock(&ext4_li_mtx
);
3009 mutex_lock(&eli
->li_list_mtx
);
3010 if (!list_empty(&eli
->li_request_list
)) {
3011 mutex_unlock(&eli
->li_list_mtx
);
3012 mutex_unlock(&ext4_li_mtx
);
3015 mutex_unlock(&eli
->li_list_mtx
);
3016 kfree(ext4_li_info
);
3017 ext4_li_info
= NULL
;
3018 mutex_unlock(&ext4_li_mtx
);
3023 static void ext4_clear_request_list(void)
3025 struct list_head
*pos
, *n
;
3026 struct ext4_li_request
*elr
;
3028 mutex_lock(&ext4_li_info
->li_list_mtx
);
3029 list_for_each_safe(pos
, n
, &ext4_li_info
->li_request_list
) {
3030 elr
= list_entry(pos
, struct ext4_li_request
,
3032 ext4_remove_li_request(elr
);
3034 mutex_unlock(&ext4_li_info
->li_list_mtx
);
3037 static int ext4_run_lazyinit_thread(void)
3039 ext4_lazyinit_task
= kthread_run(ext4_lazyinit_thread
,
3040 ext4_li_info
, "ext4lazyinit");
3041 if (IS_ERR(ext4_lazyinit_task
)) {
3042 int err
= PTR_ERR(ext4_lazyinit_task
);
3043 ext4_clear_request_list();
3044 kfree(ext4_li_info
);
3045 ext4_li_info
= NULL
;
3046 printk(KERN_CRIT
"EXT4-fs: error %d creating inode table "
3047 "initialization thread\n",
3051 ext4_li_info
->li_state
|= EXT4_LAZYINIT_RUNNING
;
3056 * Check whether it make sense to run itable init. thread or not.
3057 * If there is at least one uninitialized inode table, return
3058 * corresponding group number, else the loop goes through all
3059 * groups and return total number of groups.
3061 static ext4_group_t
ext4_has_uninit_itable(struct super_block
*sb
)
3063 ext4_group_t group
, ngroups
= EXT4_SB(sb
)->s_groups_count
;
3064 struct ext4_group_desc
*gdp
= NULL
;
3066 for (group
= 0; group
< ngroups
; group
++) {
3067 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
3071 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
3078 static int ext4_li_info_new(void)
3080 struct ext4_lazy_init
*eli
= NULL
;
3082 eli
= kzalloc(sizeof(*eli
), GFP_KERNEL
);
3086 INIT_LIST_HEAD(&eli
->li_request_list
);
3087 mutex_init(&eli
->li_list_mtx
);
3089 eli
->li_state
|= EXT4_LAZYINIT_QUIT
;
3096 static struct ext4_li_request
*ext4_li_request_new(struct super_block
*sb
,
3099 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3100 struct ext4_li_request
*elr
;
3102 elr
= kzalloc(sizeof(*elr
), GFP_KERNEL
);
3108 elr
->lr_next_group
= start
;
3111 * Randomize first schedule time of the request to
3112 * spread the inode table initialization requests
3115 elr
->lr_next_sched
= jiffies
+ (prandom_u32() %
3116 (EXT4_DEF_LI_MAX_START_DELAY
* HZ
));
3120 int ext4_register_li_request(struct super_block
*sb
,
3121 ext4_group_t first_not_zeroed
)
3123 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3124 struct ext4_li_request
*elr
= NULL
;
3125 ext4_group_t ngroups
= EXT4_SB(sb
)->s_groups_count
;
3128 mutex_lock(&ext4_li_mtx
);
3129 if (sbi
->s_li_request
!= NULL
) {
3131 * Reset timeout so it can be computed again, because
3132 * s_li_wait_mult might have changed.
3134 sbi
->s_li_request
->lr_timeout
= 0;
3138 if (first_not_zeroed
== ngroups
|| sb_rdonly(sb
) ||
3139 !test_opt(sb
, INIT_INODE_TABLE
))
3142 elr
= ext4_li_request_new(sb
, first_not_zeroed
);
3148 if (NULL
== ext4_li_info
) {
3149 ret
= ext4_li_info_new();
3154 mutex_lock(&ext4_li_info
->li_list_mtx
);
3155 list_add(&elr
->lr_request
, &ext4_li_info
->li_request_list
);
3156 mutex_unlock(&ext4_li_info
->li_list_mtx
);
3158 sbi
->s_li_request
= elr
;
3160 * set elr to NULL here since it has been inserted to
3161 * the request_list and the removal and free of it is
3162 * handled by ext4_clear_request_list from now on.
3166 if (!(ext4_li_info
->li_state
& EXT4_LAZYINIT_RUNNING
)) {
3167 ret
= ext4_run_lazyinit_thread();
3172 mutex_unlock(&ext4_li_mtx
);
3179 * We do not need to lock anything since this is called on
3182 static void ext4_destroy_lazyinit_thread(void)
3185 * If thread exited earlier
3186 * there's nothing to be done.
3188 if (!ext4_li_info
|| !ext4_lazyinit_task
)
3191 kthread_stop(ext4_lazyinit_task
);
3194 static int set_journal_csum_feature_set(struct super_block
*sb
)
3197 int compat
, incompat
;
3198 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3200 if (ext4_has_metadata_csum(sb
)) {
3201 /* journal checksum v3 */
3203 incompat
= JBD2_FEATURE_INCOMPAT_CSUM_V3
;
3205 /* journal checksum v1 */
3206 compat
= JBD2_FEATURE_COMPAT_CHECKSUM
;
3210 jbd2_journal_clear_features(sbi
->s_journal
,
3211 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
3212 JBD2_FEATURE_INCOMPAT_CSUM_V3
|
3213 JBD2_FEATURE_INCOMPAT_CSUM_V2
);
3214 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
3215 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3217 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
|
3219 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
3220 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3223 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3224 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3226 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3227 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3234 * Note: calculating the overhead so we can be compatible with
3235 * historical BSD practice is quite difficult in the face of
3236 * clusters/bigalloc. This is because multiple metadata blocks from
3237 * different block group can end up in the same allocation cluster.
3238 * Calculating the exact overhead in the face of clustered allocation
3239 * requires either O(all block bitmaps) in memory or O(number of block
3240 * groups**2) in time. We will still calculate the superblock for
3241 * older file systems --- and if we come across with a bigalloc file
3242 * system with zero in s_overhead_clusters the estimate will be close to
3243 * correct especially for very large cluster sizes --- but for newer
3244 * file systems, it's better to calculate this figure once at mkfs
3245 * time, and store it in the superblock. If the superblock value is
3246 * present (even for non-bigalloc file systems), we will use it.
3248 static int count_overhead(struct super_block
*sb
, ext4_group_t grp
,
3251 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3252 struct ext4_group_desc
*gdp
;
3253 ext4_fsblk_t first_block
, last_block
, b
;
3254 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3255 int s
, j
, count
= 0;
3257 if (!ext4_has_feature_bigalloc(sb
))
3258 return (ext4_bg_has_super(sb
, grp
) + ext4_bg_num_gdb(sb
, grp
) +
3259 sbi
->s_itb_per_group
+ 2);
3261 first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
) +
3262 (grp
* EXT4_BLOCKS_PER_GROUP(sb
));
3263 last_block
= first_block
+ EXT4_BLOCKS_PER_GROUP(sb
) - 1;
3264 for (i
= 0; i
< ngroups
; i
++) {
3265 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
3266 b
= ext4_block_bitmap(sb
, gdp
);
3267 if (b
>= first_block
&& b
<= last_block
) {
3268 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3271 b
= ext4_inode_bitmap(sb
, gdp
);
3272 if (b
>= first_block
&& b
<= last_block
) {
3273 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3276 b
= ext4_inode_table(sb
, gdp
);
3277 if (b
>= first_block
&& b
+ sbi
->s_itb_per_group
<= last_block
)
3278 for (j
= 0; j
< sbi
->s_itb_per_group
; j
++, b
++) {
3279 int c
= EXT4_B2C(sbi
, b
- first_block
);
3280 ext4_set_bit(c
, buf
);
3286 if (ext4_bg_has_super(sb
, grp
)) {
3287 ext4_set_bit(s
++, buf
);
3290 j
= ext4_bg_num_gdb(sb
, grp
);
3291 if (s
+ j
> EXT4_BLOCKS_PER_GROUP(sb
)) {
3292 ext4_error(sb
, "Invalid number of block group "
3293 "descriptor blocks: %d", j
);
3294 j
= EXT4_BLOCKS_PER_GROUP(sb
) - s
;
3298 ext4_set_bit(EXT4_B2C(sbi
, s
++), buf
);
3302 return EXT4_CLUSTERS_PER_GROUP(sb
) -
3303 ext4_count_free(buf
, EXT4_CLUSTERS_PER_GROUP(sb
) / 8);
3307 * Compute the overhead and stash it in sbi->s_overhead
3309 int ext4_calculate_overhead(struct super_block
*sb
)
3311 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3312 struct ext4_super_block
*es
= sbi
->s_es
;
3313 struct inode
*j_inode
;
3314 unsigned int j_blocks
, j_inum
= le32_to_cpu(es
->s_journal_inum
);
3315 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3316 ext4_fsblk_t overhead
= 0;
3317 char *buf
= (char *) get_zeroed_page(GFP_NOFS
);
3323 * Compute the overhead (FS structures). This is constant
3324 * for a given filesystem unless the number of block groups
3325 * changes so we cache the previous value until it does.
3329 * All of the blocks before first_data_block are overhead
3331 overhead
= EXT4_B2C(sbi
, le32_to_cpu(es
->s_first_data_block
));
3334 * Add the overhead found in each block group
3336 for (i
= 0; i
< ngroups
; i
++) {
3339 blks
= count_overhead(sb
, i
, buf
);
3342 memset(buf
, 0, PAGE_SIZE
);
3347 * Add the internal journal blocks whether the journal has been
3350 if (sbi
->s_journal
&& !sbi
->journal_bdev
)
3351 overhead
+= EXT4_NUM_B2C(sbi
, sbi
->s_journal
->j_maxlen
);
3352 else if (ext4_has_feature_journal(sb
) && !sbi
->s_journal
) {
3353 j_inode
= ext4_get_journal_inode(sb
, j_inum
);
3355 j_blocks
= j_inode
->i_size
>> sb
->s_blocksize_bits
;
3356 overhead
+= EXT4_NUM_B2C(sbi
, j_blocks
);
3359 ext4_msg(sb
, KERN_ERR
, "can't get journal size");
3362 sbi
->s_overhead
= overhead
;
3364 free_page((unsigned long) buf
);
3368 static void ext4_set_resv_clusters(struct super_block
*sb
)
3370 ext4_fsblk_t resv_clusters
;
3371 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3374 * There's no need to reserve anything when we aren't using extents.
3375 * The space estimates are exact, there are no unwritten extents,
3376 * hole punching doesn't need new metadata... This is needed especially
3377 * to keep ext2/3 backward compatibility.
3379 if (!ext4_has_feature_extents(sb
))
3382 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3383 * This should cover the situations where we can not afford to run
3384 * out of space like for example punch hole, or converting
3385 * unwritten extents in delalloc path. In most cases such
3386 * allocation would require 1, or 2 blocks, higher numbers are
3389 resv_clusters
= (ext4_blocks_count(sbi
->s_es
) >>
3390 sbi
->s_cluster_bits
);
3392 do_div(resv_clusters
, 50);
3393 resv_clusters
= min_t(ext4_fsblk_t
, resv_clusters
, 4096);
3395 atomic64_set(&sbi
->s_resv_clusters
, resv_clusters
);
3398 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
3400 struct dax_device
*dax_dev
= fs_dax_get_by_bdev(sb
->s_bdev
);
3401 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
3402 struct buffer_head
*bh
;
3403 struct ext4_super_block
*es
= NULL
;
3404 struct ext4_sb_info
*sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
3406 ext4_fsblk_t sb_block
= get_sb_block(&data
);
3407 ext4_fsblk_t logical_sb_block
;
3408 unsigned long offset
= 0;
3409 unsigned long journal_devnum
= 0;
3410 unsigned long def_mount_opts
;
3414 int blocksize
, clustersize
;
3415 unsigned int db_count
;
3417 int needs_recovery
, has_huge_files
, has_bigalloc
;
3420 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3421 ext4_group_t first_not_zeroed
;
3423 if ((data
&& !orig_data
) || !sbi
)
3426 sbi
->s_daxdev
= dax_dev
;
3427 sbi
->s_blockgroup_lock
=
3428 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
3429 if (!sbi
->s_blockgroup_lock
)
3432 sb
->s_fs_info
= sbi
;
3434 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
3435 sbi
->s_sb_block
= sb_block
;
3436 if (sb
->s_bdev
->bd_part
)
3437 sbi
->s_sectors_written_start
=
3438 part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]);
3440 /* Cleanup superblock name */
3441 strreplace(sb
->s_id
, '/', '!');
3443 /* -EINVAL is default */
3445 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
3447 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
3452 * The ext4 superblock will not be buffer aligned for other than 1kB
3453 * block sizes. We need to calculate the offset from buffer start.
3455 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
3456 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3457 offset
= do_div(logical_sb_block
, blocksize
);
3459 logical_sb_block
= sb_block
;
3462 if (!(bh
= sb_bread_unmovable(sb
, logical_sb_block
))) {
3463 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
3467 * Note: s_es must be initialized as soon as possible because
3468 * some ext4 macro-instructions depend on its value
3470 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
3472 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
3473 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
3475 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
3477 /* Warn if metadata_csum and gdt_csum are both set. */
3478 if (ext4_has_feature_metadata_csum(sb
) &&
3479 ext4_has_feature_gdt_csum(sb
))
3480 ext4_warning(sb
, "metadata_csum and uninit_bg are "
3481 "redundant flags; please run fsck.");
3483 /* Check for a known checksum algorithm */
3484 if (!ext4_verify_csum_type(sb
, es
)) {
3485 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3486 "unknown checksum algorithm.");
3491 /* Load the checksum driver */
3492 if (ext4_has_feature_metadata_csum(sb
) ||
3493 ext4_has_feature_ea_inode(sb
)) {
3494 sbi
->s_chksum_driver
= crypto_alloc_shash("crc32c", 0, 0);
3495 if (IS_ERR(sbi
->s_chksum_driver
)) {
3496 ext4_msg(sb
, KERN_ERR
, "Cannot load crc32c driver.");
3497 ret
= PTR_ERR(sbi
->s_chksum_driver
);
3498 sbi
->s_chksum_driver
= NULL
;
3503 /* Check superblock checksum */
3504 if (!ext4_superblock_csum_verify(sb
, es
)) {
3505 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3506 "invalid superblock checksum. Run e2fsck?");
3512 /* Precompute checksum seed for all metadata */
3513 if (ext4_has_feature_csum_seed(sb
))
3514 sbi
->s_csum_seed
= le32_to_cpu(es
->s_checksum_seed
);
3515 else if (ext4_has_metadata_csum(sb
) || ext4_has_feature_ea_inode(sb
))
3516 sbi
->s_csum_seed
= ext4_chksum(sbi
, ~0, es
->s_uuid
,
3517 sizeof(es
->s_uuid
));
3519 /* Set defaults before we parse the mount options */
3520 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
3521 set_opt(sb
, INIT_INODE_TABLE
);
3522 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
3524 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
3526 if (def_mount_opts
& EXT4_DEFM_UID16
)
3527 set_opt(sb
, NO_UID32
);
3528 /* xattr user namespace & acls are now defaulted on */
3529 set_opt(sb
, XATTR_USER
);
3530 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3531 set_opt(sb
, POSIX_ACL
);
3533 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3534 if (ext4_has_metadata_csum(sb
))
3535 set_opt(sb
, JOURNAL_CHECKSUM
);
3537 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
3538 set_opt(sb
, JOURNAL_DATA
);
3539 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
3540 set_opt(sb
, ORDERED_DATA
);
3541 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
3542 set_opt(sb
, WRITEBACK_DATA
);
3544 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
3545 set_opt(sb
, ERRORS_PANIC
);
3546 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
3547 set_opt(sb
, ERRORS_CONT
);
3549 set_opt(sb
, ERRORS_RO
);
3550 /* block_validity enabled by default; disable with noblock_validity */
3551 set_opt(sb
, BLOCK_VALIDITY
);
3552 if (def_mount_opts
& EXT4_DEFM_DISCARD
)
3553 set_opt(sb
, DISCARD
);
3555 sbi
->s_resuid
= make_kuid(&init_user_ns
, le16_to_cpu(es
->s_def_resuid
));
3556 sbi
->s_resgid
= make_kgid(&init_user_ns
, le16_to_cpu(es
->s_def_resgid
));
3557 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
3558 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
3559 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
3561 if ((def_mount_opts
& EXT4_DEFM_NOBARRIER
) == 0)
3562 set_opt(sb
, BARRIER
);
3565 * enable delayed allocation by default
3566 * Use -o nodelalloc to turn it off
3568 if (!IS_EXT3_SB(sb
) && !IS_EXT2_SB(sb
) &&
3569 ((def_mount_opts
& EXT4_DEFM_NODELALLOC
) == 0))
3570 set_opt(sb
, DELALLOC
);
3573 * set default s_li_wait_mult for lazyinit, for the case there is
3574 * no mount option specified.
3576 sbi
->s_li_wait_mult
= EXT4_DEF_LI_WAIT_MULT
;
3578 if (sbi
->s_es
->s_mount_opts
[0]) {
3579 char *s_mount_opts
= kstrndup(sbi
->s_es
->s_mount_opts
,
3580 sizeof(sbi
->s_es
->s_mount_opts
),
3584 if (!parse_options(s_mount_opts
, sb
, &journal_devnum
,
3585 &journal_ioprio
, 0)) {
3586 ext4_msg(sb
, KERN_WARNING
,
3587 "failed to parse options in superblock: %s",
3590 kfree(s_mount_opts
);
3592 sbi
->s_def_mount_opt
= sbi
->s_mount_opt
;
3593 if (!parse_options((char *) data
, sb
, &journal_devnum
,
3594 &journal_ioprio
, 0))
3597 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
3598 printk_once(KERN_WARNING
"EXT4-fs: Warning: mounting "
3599 "with data=journal disables delayed "
3600 "allocation and O_DIRECT support!\n");
3601 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
3602 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3603 "both data=journal and delalloc");
3606 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
3607 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3608 "both data=journal and dioread_nolock");
3611 if (test_opt(sb
, DAX
)) {
3612 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3613 "both data=journal and dax");
3616 if (ext4_has_feature_encrypt(sb
)) {
3617 ext4_msg(sb
, KERN_WARNING
,
3618 "encrypted files will use data=ordered "
3619 "instead of data journaling mode");
3621 if (test_opt(sb
, DELALLOC
))
3622 clear_opt(sb
, DELALLOC
);
3624 sb
->s_iflags
|= SB_I_CGROUPWB
;
3627 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3628 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
3630 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
3631 (ext4_has_compat_features(sb
) ||
3632 ext4_has_ro_compat_features(sb
) ||
3633 ext4_has_incompat_features(sb
)))
3634 ext4_msg(sb
, KERN_WARNING
,
3635 "feature flags set on rev 0 fs, "
3636 "running e2fsck is recommended");
3638 if (es
->s_creator_os
== cpu_to_le32(EXT4_OS_HURD
)) {
3639 set_opt2(sb
, HURD_COMPAT
);
3640 if (ext4_has_feature_64bit(sb
)) {
3641 ext4_msg(sb
, KERN_ERR
,
3642 "The Hurd can't support 64-bit file systems");
3647 * ea_inode feature uses l_i_version field which is not
3648 * available in HURD_COMPAT mode.
3650 if (ext4_has_feature_ea_inode(sb
)) {
3651 ext4_msg(sb
, KERN_ERR
,
3652 "ea_inode feature is not supported for Hurd");
3657 if (IS_EXT2_SB(sb
)) {
3658 if (ext2_feature_set_ok(sb
))
3659 ext4_msg(sb
, KERN_INFO
, "mounting ext2 file system "
3660 "using the ext4 subsystem");
3662 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext2 due "
3663 "to feature incompatibilities");
3668 if (IS_EXT3_SB(sb
)) {
3669 if (ext3_feature_set_ok(sb
))
3670 ext4_msg(sb
, KERN_INFO
, "mounting ext3 file system "
3671 "using the ext4 subsystem");
3673 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext3 due "
3674 "to feature incompatibilities");
3680 * Check feature flags regardless of the revision level, since we
3681 * previously didn't change the revision level when setting the flags,
3682 * so there is a chance incompat flags are set on a rev 0 filesystem.
3684 if (!ext4_feature_set_ok(sb
, (sb_rdonly(sb
))))
3687 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
3688 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
3689 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
3690 ext4_msg(sb
, KERN_ERR
,
3691 "Unsupported filesystem blocksize %d (%d log_block_size)",
3692 blocksize
, le32_to_cpu(es
->s_log_block_size
));
3695 if (le32_to_cpu(es
->s_log_block_size
) >
3696 (EXT4_MAX_BLOCK_LOG_SIZE
- EXT4_MIN_BLOCK_LOG_SIZE
)) {
3697 ext4_msg(sb
, KERN_ERR
,
3698 "Invalid log block size: %u",
3699 le32_to_cpu(es
->s_log_block_size
));
3703 if (le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
) > (blocksize
/ 4)) {
3704 ext4_msg(sb
, KERN_ERR
,
3705 "Number of reserved GDT blocks insanely large: %d",
3706 le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
));
3710 if (sbi
->s_mount_opt
& EXT4_MOUNT_DAX
) {
3711 err
= bdev_dax_supported(sb
, blocksize
);
3716 if (ext4_has_feature_encrypt(sb
) && es
->s_encryption_level
) {
3717 ext4_msg(sb
, KERN_ERR
, "Unsupported encryption level %d",
3718 es
->s_encryption_level
);
3722 if (sb
->s_blocksize
!= blocksize
) {
3723 /* Validate the filesystem blocksize */
3724 if (!sb_set_blocksize(sb
, blocksize
)) {
3725 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
3731 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3732 offset
= do_div(logical_sb_block
, blocksize
);
3733 bh
= sb_bread_unmovable(sb
, logical_sb_block
);
3735 ext4_msg(sb
, KERN_ERR
,
3736 "Can't read superblock on 2nd try");
3739 es
= (struct ext4_super_block
*)(bh
->b_data
+ offset
);
3741 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
3742 ext4_msg(sb
, KERN_ERR
,
3743 "Magic mismatch, very weird!");
3748 has_huge_files
= ext4_has_feature_huge_file(sb
);
3749 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
3751 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
3753 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
3754 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
3755 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
3757 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
3758 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
3759 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
3760 (!is_power_of_2(sbi
->s_inode_size
)) ||
3761 (sbi
->s_inode_size
> blocksize
)) {
3762 ext4_msg(sb
, KERN_ERR
,
3763 "unsupported inode size: %d",
3767 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
3768 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
3771 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
3772 if (ext4_has_feature_64bit(sb
)) {
3773 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
3774 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
3775 !is_power_of_2(sbi
->s_desc_size
)) {
3776 ext4_msg(sb
, KERN_ERR
,
3777 "unsupported descriptor size %lu",
3782 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
3784 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
3785 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
3787 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
3788 if (sbi
->s_inodes_per_block
== 0)
3790 if (sbi
->s_inodes_per_group
< sbi
->s_inodes_per_block
||
3791 sbi
->s_inodes_per_group
> blocksize
* 8) {
3792 ext4_msg(sb
, KERN_ERR
, "invalid inodes per group: %lu\n",
3793 sbi
->s_blocks_per_group
);
3796 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
3797 sbi
->s_inodes_per_block
;
3798 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
3800 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3801 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
3802 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
3804 for (i
= 0; i
< 4; i
++)
3805 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
3806 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
3807 if (ext4_has_feature_dir_index(sb
)) {
3808 i
= le32_to_cpu(es
->s_flags
);
3809 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
3810 sbi
->s_hash_unsigned
= 3;
3811 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
3812 #ifdef __CHAR_UNSIGNED__
3815 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
3816 sbi
->s_hash_unsigned
= 3;
3820 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
3825 /* Handle clustersize */
3826 clustersize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_cluster_size
);
3827 has_bigalloc
= ext4_has_feature_bigalloc(sb
);
3829 if (clustersize
< blocksize
) {
3830 ext4_msg(sb
, KERN_ERR
,
3831 "cluster size (%d) smaller than "
3832 "block size (%d)", clustersize
, blocksize
);
3835 if (le32_to_cpu(es
->s_log_cluster_size
) >
3836 (EXT4_MAX_CLUSTER_LOG_SIZE
- EXT4_MIN_BLOCK_LOG_SIZE
)) {
3837 ext4_msg(sb
, KERN_ERR
,
3838 "Invalid log cluster size: %u",
3839 le32_to_cpu(es
->s_log_cluster_size
));
3842 sbi
->s_cluster_bits
= le32_to_cpu(es
->s_log_cluster_size
) -
3843 le32_to_cpu(es
->s_log_block_size
);
3844 sbi
->s_clusters_per_group
=
3845 le32_to_cpu(es
->s_clusters_per_group
);
3846 if (sbi
->s_clusters_per_group
> blocksize
* 8) {
3847 ext4_msg(sb
, KERN_ERR
,
3848 "#clusters per group too big: %lu",
3849 sbi
->s_clusters_per_group
);
3852 if (sbi
->s_blocks_per_group
!=
3853 (sbi
->s_clusters_per_group
* (clustersize
/ blocksize
))) {
3854 ext4_msg(sb
, KERN_ERR
, "blocks per group (%lu) and "
3855 "clusters per group (%lu) inconsistent",
3856 sbi
->s_blocks_per_group
,
3857 sbi
->s_clusters_per_group
);
3861 if (clustersize
!= blocksize
) {
3862 ext4_warning(sb
, "fragment/cluster size (%d) != "
3863 "block size (%d)", clustersize
,
3865 clustersize
= blocksize
;
3867 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
3868 ext4_msg(sb
, KERN_ERR
,
3869 "#blocks per group too big: %lu",
3870 sbi
->s_blocks_per_group
);
3873 sbi
->s_clusters_per_group
= sbi
->s_blocks_per_group
;
3874 sbi
->s_cluster_bits
= 0;
3876 sbi
->s_cluster_ratio
= clustersize
/ blocksize
;
3878 /* Do we have standard group size of clustersize * 8 blocks ? */
3879 if (sbi
->s_blocks_per_group
== clustersize
<< 3)
3880 set_opt2(sb
, STD_GROUP_SIZE
);
3883 * Test whether we have more sectors than will fit in sector_t,
3884 * and whether the max offset is addressable by the page cache.
3886 err
= generic_check_addressable(sb
->s_blocksize_bits
,
3887 ext4_blocks_count(es
));
3889 ext4_msg(sb
, KERN_ERR
, "filesystem"
3890 " too large to mount safely on this system");
3891 if (sizeof(sector_t
) < 8)
3892 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
3896 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
3899 /* check blocks count against device size */
3900 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
3901 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
3902 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
3903 "exceeds size of device (%llu blocks)",
3904 ext4_blocks_count(es
), blocks_count
);
3909 * It makes no sense for the first data block to be beyond the end
3910 * of the filesystem.
3912 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
3913 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data "
3914 "block %u is beyond end of filesystem (%llu)",
3915 le32_to_cpu(es
->s_first_data_block
),
3916 ext4_blocks_count(es
));
3919 blocks_count
= (ext4_blocks_count(es
) -
3920 le32_to_cpu(es
->s_first_data_block
) +
3921 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
3922 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
3923 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
3924 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
3925 "(block count %llu, first data block %u, "
3926 "blocks per group %lu)", sbi
->s_groups_count
,
3927 ext4_blocks_count(es
),
3928 le32_to_cpu(es
->s_first_data_block
),
3929 EXT4_BLOCKS_PER_GROUP(sb
));
3932 sbi
->s_groups_count
= blocks_count
;
3933 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
3934 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
3935 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
3936 EXT4_DESC_PER_BLOCK(sb
);
3937 if (ext4_has_feature_meta_bg(sb
)) {
3938 if (le32_to_cpu(es
->s_first_meta_bg
) > db_count
) {
3939 ext4_msg(sb
, KERN_WARNING
,
3940 "first meta block group too large: %u "
3941 "(group descriptor block count %u)",
3942 le32_to_cpu(es
->s_first_meta_bg
), db_count
);
3946 sbi
->s_group_desc
= kvmalloc(db_count
*
3947 sizeof(struct buffer_head
*),
3949 if (sbi
->s_group_desc
== NULL
) {
3950 ext4_msg(sb
, KERN_ERR
, "not enough memory");
3955 bgl_lock_init(sbi
->s_blockgroup_lock
);
3957 /* Pre-read the descriptors into the buffer cache */
3958 for (i
= 0; i
< db_count
; i
++) {
3959 block
= descriptor_loc(sb
, logical_sb_block
, i
);
3960 sb_breadahead(sb
, block
);
3963 for (i
= 0; i
< db_count
; i
++) {
3964 block
= descriptor_loc(sb
, logical_sb_block
, i
);
3965 sbi
->s_group_desc
[i
] = sb_bread_unmovable(sb
, block
);
3966 if (!sbi
->s_group_desc
[i
]) {
3967 ext4_msg(sb
, KERN_ERR
,
3968 "can't read group descriptor %d", i
);
3973 if (!ext4_check_descriptors(sb
, logical_sb_block
, &first_not_zeroed
)) {
3974 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
3975 ret
= -EFSCORRUPTED
;
3979 sbi
->s_gdb_count
= db_count
;
3980 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
3981 spin_lock_init(&sbi
->s_next_gen_lock
);
3983 setup_timer(&sbi
->s_err_report
, print_daily_error_info
,
3984 (unsigned long) sb
);
3986 /* Register extent status tree shrinker */
3987 if (ext4_es_register_shrinker(sbi
))
3990 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
3991 sbi
->s_extent_max_zeroout_kb
= 32;
3994 * set up enough so that it can read an inode
3996 sb
->s_op
= &ext4_sops
;
3997 sb
->s_export_op
= &ext4_export_ops
;
3998 sb
->s_xattr
= ext4_xattr_handlers
;
3999 sb
->s_cop
= &ext4_cryptops
;
4001 sb
->dq_op
= &ext4_quota_operations
;
4002 if (ext4_has_feature_quota(sb
))
4003 sb
->s_qcop
= &dquot_quotactl_sysfile_ops
;
4005 sb
->s_qcop
= &ext4_qctl_operations
;
4006 sb
->s_quota_types
= QTYPE_MASK_USR
| QTYPE_MASK_GRP
| QTYPE_MASK_PRJ
;
4008 memcpy(&sb
->s_uuid
, es
->s_uuid
, sizeof(es
->s_uuid
));
4010 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
4011 mutex_init(&sbi
->s_orphan_lock
);
4015 needs_recovery
= (es
->s_last_orphan
!= 0 ||
4016 ext4_has_feature_journal_needs_recovery(sb
));
4018 if (ext4_has_feature_mmp(sb
) && !sb_rdonly(sb
))
4019 if (ext4_multi_mount_protect(sb
, le64_to_cpu(es
->s_mmp_block
)))
4020 goto failed_mount3a
;
4023 * The first inode we look at is the journal inode. Don't try
4024 * root first: it may be modified in the journal!
4026 if (!test_opt(sb
, NOLOAD
) && ext4_has_feature_journal(sb
)) {
4027 err
= ext4_load_journal(sb
, es
, journal_devnum
);
4029 goto failed_mount3a
;
4030 } else if (test_opt(sb
, NOLOAD
) && !sb_rdonly(sb
) &&
4031 ext4_has_feature_journal_needs_recovery(sb
)) {
4032 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
4033 "suppressed and not mounted read-only");
4034 goto failed_mount_wq
;
4036 /* Nojournal mode, all journal mount options are illegal */
4037 if (test_opt2(sb
, EXPLICIT_JOURNAL_CHECKSUM
)) {
4038 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4039 "journal_checksum, fs mounted w/o journal");
4040 goto failed_mount_wq
;
4042 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
4043 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4044 "journal_async_commit, fs mounted w/o journal");
4045 goto failed_mount_wq
;
4047 if (sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
) {
4048 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4049 "commit=%lu, fs mounted w/o journal",
4050 sbi
->s_commit_interval
/ HZ
);
4051 goto failed_mount_wq
;
4053 if (EXT4_MOUNT_DATA_FLAGS
&
4054 (sbi
->s_mount_opt
^ sbi
->s_def_mount_opt
)) {
4055 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4056 "data=, fs mounted w/o journal");
4057 goto failed_mount_wq
;
4059 sbi
->s_def_mount_opt
&= EXT4_MOUNT_JOURNAL_CHECKSUM
;
4060 clear_opt(sb
, JOURNAL_CHECKSUM
);
4061 clear_opt(sb
, DATA_FLAGS
);
4062 sbi
->s_journal
= NULL
;
4067 if (ext4_has_feature_64bit(sb
) &&
4068 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
4069 JBD2_FEATURE_INCOMPAT_64BIT
)) {
4070 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
4071 goto failed_mount_wq
;
4074 if (!set_journal_csum_feature_set(sb
)) {
4075 ext4_msg(sb
, KERN_ERR
, "Failed to set journal checksum "
4077 goto failed_mount_wq
;
4080 /* We have now updated the journal if required, so we can
4081 * validate the data journaling mode. */
4082 switch (test_opt(sb
, DATA_FLAGS
)) {
4084 /* No mode set, assume a default based on the journal
4085 * capabilities: ORDERED_DATA if the journal can
4086 * cope, else JOURNAL_DATA
4088 if (jbd2_journal_check_available_features
4089 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
4090 set_opt(sb
, ORDERED_DATA
);
4092 set_opt(sb
, JOURNAL_DATA
);
4095 case EXT4_MOUNT_ORDERED_DATA
:
4096 case EXT4_MOUNT_WRITEBACK_DATA
:
4097 if (!jbd2_journal_check_available_features
4098 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
4099 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
4100 "requested data journaling mode");
4101 goto failed_mount_wq
;
4107 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
&&
4108 test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
4109 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4110 "journal_async_commit in data=ordered mode");
4111 goto failed_mount_wq
;
4114 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
4116 sbi
->s_journal
->j_commit_callback
= ext4_journal_commit_callback
;
4119 if (!test_opt(sb
, NO_MBCACHE
)) {
4120 sbi
->s_ea_block_cache
= ext4_xattr_create_cache();
4121 if (!sbi
->s_ea_block_cache
) {
4122 ext4_msg(sb
, KERN_ERR
,
4123 "Failed to create ea_block_cache");
4124 goto failed_mount_wq
;
4127 if (ext4_has_feature_ea_inode(sb
)) {
4128 sbi
->s_ea_inode_cache
= ext4_xattr_create_cache();
4129 if (!sbi
->s_ea_inode_cache
) {
4130 ext4_msg(sb
, KERN_ERR
,
4131 "Failed to create ea_inode_cache");
4132 goto failed_mount_wq
;
4137 if ((DUMMY_ENCRYPTION_ENABLED(sbi
) || ext4_has_feature_encrypt(sb
)) &&
4138 (blocksize
!= PAGE_SIZE
)) {
4139 ext4_msg(sb
, KERN_ERR
,
4140 "Unsupported blocksize for fs encryption");
4141 goto failed_mount_wq
;
4144 if (DUMMY_ENCRYPTION_ENABLED(sbi
) && !sb_rdonly(sb
) &&
4145 !ext4_has_feature_encrypt(sb
)) {
4146 ext4_set_feature_encrypt(sb
);
4147 ext4_commit_super(sb
, 1);
4151 * Get the # of file system overhead blocks from the
4152 * superblock if present.
4154 if (es
->s_overhead_clusters
)
4155 sbi
->s_overhead
= le32_to_cpu(es
->s_overhead_clusters
);
4157 err
= ext4_calculate_overhead(sb
);
4159 goto failed_mount_wq
;
4163 * The maximum number of concurrent works can be high and
4164 * concurrency isn't really necessary. Limit it to 1.
4166 EXT4_SB(sb
)->rsv_conversion_wq
=
4167 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM
| WQ_UNBOUND
, 1);
4168 if (!EXT4_SB(sb
)->rsv_conversion_wq
) {
4169 printk(KERN_ERR
"EXT4-fs: failed to create workqueue\n");
4175 * The jbd2_journal_load will have done any necessary log recovery,
4176 * so we can safely mount the rest of the filesystem now.
4179 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
4181 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
4182 ret
= PTR_ERR(root
);
4186 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
4187 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
4191 sb
->s_root
= d_make_root(root
);
4193 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
4198 if (ext4_setup_super(sb
, es
, sb_rdonly(sb
)))
4199 sb
->s_flags
|= MS_RDONLY
;
4201 /* determine the minimum size of new large inodes, if present */
4202 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
&&
4203 sbi
->s_want_extra_isize
== 0) {
4204 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
4205 EXT4_GOOD_OLD_INODE_SIZE
;
4206 if (ext4_has_feature_extra_isize(sb
)) {
4207 if (sbi
->s_want_extra_isize
<
4208 le16_to_cpu(es
->s_want_extra_isize
))
4209 sbi
->s_want_extra_isize
=
4210 le16_to_cpu(es
->s_want_extra_isize
);
4211 if (sbi
->s_want_extra_isize
<
4212 le16_to_cpu(es
->s_min_extra_isize
))
4213 sbi
->s_want_extra_isize
=
4214 le16_to_cpu(es
->s_min_extra_isize
);
4217 /* Check if enough inode space is available */
4218 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
4219 sbi
->s_inode_size
) {
4220 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
4221 EXT4_GOOD_OLD_INODE_SIZE
;
4222 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
4226 ext4_set_resv_clusters(sb
);
4228 err
= ext4_setup_system_zone(sb
);
4230 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
4232 goto failed_mount4a
;
4236 err
= ext4_mb_init(sb
);
4238 ext4_msg(sb
, KERN_ERR
, "failed to initialize mballoc (%d)",
4243 block
= ext4_count_free_clusters(sb
);
4244 ext4_free_blocks_count_set(sbi
->s_es
,
4245 EXT4_C2B(sbi
, block
));
4246 err
= percpu_counter_init(&sbi
->s_freeclusters_counter
, block
,
4249 unsigned long freei
= ext4_count_free_inodes(sb
);
4250 sbi
->s_es
->s_free_inodes_count
= cpu_to_le32(freei
);
4251 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
, freei
,
4255 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
4256 ext4_count_dirs(sb
), GFP_KERNEL
);
4258 err
= percpu_counter_init(&sbi
->s_dirtyclusters_counter
, 0,
4261 err
= percpu_init_rwsem(&sbi
->s_journal_flag_rwsem
);
4264 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
4268 if (ext4_has_feature_flex_bg(sb
))
4269 if (!ext4_fill_flex_info(sb
)) {
4270 ext4_msg(sb
, KERN_ERR
,
4271 "unable to initialize "
4272 "flex_bg meta info!");
4276 err
= ext4_register_li_request(sb
, first_not_zeroed
);
4280 err
= ext4_register_sysfs(sb
);
4285 /* Enable quota usage during mount. */
4286 if (ext4_has_feature_quota(sb
) && !sb_rdonly(sb
)) {
4287 err
= ext4_enable_quotas(sb
);
4291 #endif /* CONFIG_QUOTA */
4293 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
4294 ext4_orphan_cleanup(sb
, es
);
4295 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
4296 if (needs_recovery
) {
4297 ext4_msg(sb
, KERN_INFO
, "recovery complete");
4298 ext4_mark_recovery_complete(sb
, es
);
4300 if (EXT4_SB(sb
)->s_journal
) {
4301 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
4302 descr
= " journalled data mode";
4303 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
4304 descr
= " ordered data mode";
4306 descr
= " writeback data mode";
4308 descr
= "out journal";
4310 if (test_opt(sb
, DISCARD
)) {
4311 struct request_queue
*q
= bdev_get_queue(sb
->s_bdev
);
4312 if (!blk_queue_discard(q
))
4313 ext4_msg(sb
, KERN_WARNING
,
4314 "mounting with \"discard\" option, but "
4315 "the device does not support discard");
4318 if (___ratelimit(&ext4_mount_msg_ratelimit
, "EXT4-fs mount"))
4319 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s. "
4320 "Opts: %.*s%s%s", descr
,
4321 (int) sizeof(sbi
->s_es
->s_mount_opts
),
4322 sbi
->s_es
->s_mount_opts
,
4323 *sbi
->s_es
->s_mount_opts
? "; " : "", orig_data
);
4325 if (es
->s_error_count
)
4326 mod_timer(&sbi
->s_err_report
, jiffies
+ 300*HZ
); /* 5 minutes */
4328 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4329 ratelimit_state_init(&sbi
->s_err_ratelimit_state
, 5 * HZ
, 10);
4330 ratelimit_state_init(&sbi
->s_warning_ratelimit_state
, 5 * HZ
, 10);
4331 ratelimit_state_init(&sbi
->s_msg_ratelimit_state
, 5 * HZ
, 10);
4338 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
4343 ext4_unregister_sysfs(sb
);
4346 ext4_unregister_li_request(sb
);
4348 ext4_mb_release(sb
);
4349 if (sbi
->s_flex_groups
)
4350 kvfree(sbi
->s_flex_groups
);
4351 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
4352 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
4353 percpu_counter_destroy(&sbi
->s_dirs_counter
);
4354 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
4356 ext4_ext_release(sb
);
4357 ext4_release_system_zone(sb
);
4362 ext4_msg(sb
, KERN_ERR
, "mount failed");
4363 if (EXT4_SB(sb
)->rsv_conversion_wq
)
4364 destroy_workqueue(EXT4_SB(sb
)->rsv_conversion_wq
);
4366 if (sbi
->s_ea_inode_cache
) {
4367 ext4_xattr_destroy_cache(sbi
->s_ea_inode_cache
);
4368 sbi
->s_ea_inode_cache
= NULL
;
4370 if (sbi
->s_ea_block_cache
) {
4371 ext4_xattr_destroy_cache(sbi
->s_ea_block_cache
);
4372 sbi
->s_ea_block_cache
= NULL
;
4374 if (sbi
->s_journal
) {
4375 jbd2_journal_destroy(sbi
->s_journal
);
4376 sbi
->s_journal
= NULL
;
4379 ext4_es_unregister_shrinker(sbi
);
4381 del_timer_sync(&sbi
->s_err_report
);
4383 kthread_stop(sbi
->s_mmp_tsk
);
4385 for (i
= 0; i
< db_count
; i
++)
4386 brelse(sbi
->s_group_desc
[i
]);
4387 kvfree(sbi
->s_group_desc
);
4389 if (sbi
->s_chksum_driver
)
4390 crypto_free_shash(sbi
->s_chksum_driver
);
4392 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
4393 kfree(sbi
->s_qf_names
[i
]);
4395 ext4_blkdev_remove(sbi
);
4398 sb
->s_fs_info
= NULL
;
4399 kfree(sbi
->s_blockgroup_lock
);
4403 fs_put_dax(dax_dev
);
4404 return err
? err
: ret
;
4408 * Setup any per-fs journal parameters now. We'll do this both on
4409 * initial mount, once the journal has been initialised but before we've
4410 * done any recovery; and again on any subsequent remount.
4412 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
4414 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4416 journal
->j_commit_interval
= sbi
->s_commit_interval
;
4417 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
4418 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
4420 write_lock(&journal
->j_state_lock
);
4421 if (test_opt(sb
, BARRIER
))
4422 journal
->j_flags
|= JBD2_BARRIER
;
4424 journal
->j_flags
&= ~JBD2_BARRIER
;
4425 if (test_opt(sb
, DATA_ERR_ABORT
))
4426 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
4428 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
4429 write_unlock(&journal
->j_state_lock
);
4432 static struct inode
*ext4_get_journal_inode(struct super_block
*sb
,
4433 unsigned int journal_inum
)
4435 struct inode
*journal_inode
;
4438 * Test for the existence of a valid inode on disk. Bad things
4439 * happen if we iget() an unused inode, as the subsequent iput()
4440 * will try to delete it.
4442 journal_inode
= ext4_iget(sb
, journal_inum
);
4443 if (IS_ERR(journal_inode
)) {
4444 ext4_msg(sb
, KERN_ERR
, "no journal found");
4447 if (!journal_inode
->i_nlink
) {
4448 make_bad_inode(journal_inode
);
4449 iput(journal_inode
);
4450 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
4454 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4455 journal_inode
, journal_inode
->i_size
);
4456 if (!S_ISREG(journal_inode
->i_mode
)) {
4457 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
4458 iput(journal_inode
);
4461 return journal_inode
;
4464 static journal_t
*ext4_get_journal(struct super_block
*sb
,
4465 unsigned int journal_inum
)
4467 struct inode
*journal_inode
;
4470 BUG_ON(!ext4_has_feature_journal(sb
));
4472 journal_inode
= ext4_get_journal_inode(sb
, journal_inum
);
4476 journal
= jbd2_journal_init_inode(journal_inode
);
4478 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
4479 iput(journal_inode
);
4482 journal
->j_private
= sb
;
4483 ext4_init_journal_params(sb
, journal
);
4487 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
4490 struct buffer_head
*bh
;
4494 int hblock
, blocksize
;
4495 ext4_fsblk_t sb_block
;
4496 unsigned long offset
;
4497 struct ext4_super_block
*es
;
4498 struct block_device
*bdev
;
4500 BUG_ON(!ext4_has_feature_journal(sb
));
4502 bdev
= ext4_blkdev_get(j_dev
, sb
);
4506 blocksize
= sb
->s_blocksize
;
4507 hblock
= bdev_logical_block_size(bdev
);
4508 if (blocksize
< hblock
) {
4509 ext4_msg(sb
, KERN_ERR
,
4510 "blocksize too small for journal device");
4514 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
4515 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
4516 set_blocksize(bdev
, blocksize
);
4517 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
4518 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
4519 "external journal");
4523 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
4524 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
4525 !(le32_to_cpu(es
->s_feature_incompat
) &
4526 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
4527 ext4_msg(sb
, KERN_ERR
, "external journal has "
4533 if ((le32_to_cpu(es
->s_feature_ro_compat
) &
4534 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
) &&
4535 es
->s_checksum
!= ext4_superblock_csum(sb
, es
)) {
4536 ext4_msg(sb
, KERN_ERR
, "external journal has "
4537 "corrupt superblock");
4542 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
4543 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
4548 len
= ext4_blocks_count(es
);
4549 start
= sb_block
+ 1;
4550 brelse(bh
); /* we're done with the superblock */
4552 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
4553 start
, len
, blocksize
);
4555 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
4558 journal
->j_private
= sb
;
4559 ll_rw_block(REQ_OP_READ
, REQ_META
| REQ_PRIO
, 1, &journal
->j_sb_buffer
);
4560 wait_on_buffer(journal
->j_sb_buffer
);
4561 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
4562 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
4565 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
4566 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
4567 "user (unsupported) - %d",
4568 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
4571 EXT4_SB(sb
)->journal_bdev
= bdev
;
4572 ext4_init_journal_params(sb
, journal
);
4576 jbd2_journal_destroy(journal
);
4578 ext4_blkdev_put(bdev
);
4582 static int ext4_load_journal(struct super_block
*sb
,
4583 struct ext4_super_block
*es
,
4584 unsigned long journal_devnum
)
4587 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
4590 int really_read_only
;
4592 BUG_ON(!ext4_has_feature_journal(sb
));
4594 if (journal_devnum
&&
4595 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4596 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
4597 "numbers have changed");
4598 journal_dev
= new_decode_dev(journal_devnum
);
4600 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
4602 really_read_only
= bdev_read_only(sb
->s_bdev
);
4605 * Are we loading a blank journal or performing recovery after a
4606 * crash? For recovery, we need to check in advance whether we
4607 * can get read-write access to the device.
4609 if (ext4_has_feature_journal_needs_recovery(sb
)) {
4610 if (sb_rdonly(sb
)) {
4611 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
4612 "required on readonly filesystem");
4613 if (really_read_only
) {
4614 ext4_msg(sb
, KERN_ERR
, "write access "
4615 "unavailable, cannot proceed");
4618 ext4_msg(sb
, KERN_INFO
, "write access will "
4619 "be enabled during recovery");
4623 if (journal_inum
&& journal_dev
) {
4624 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
4625 "and inode journals!");
4630 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
4633 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
4637 if (!(journal
->j_flags
& JBD2_BARRIER
))
4638 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
4640 if (!ext4_has_feature_journal_needs_recovery(sb
))
4641 err
= jbd2_journal_wipe(journal
, !really_read_only
);
4643 char *save
= kmalloc(EXT4_S_ERR_LEN
, GFP_KERNEL
);
4645 memcpy(save
, ((char *) es
) +
4646 EXT4_S_ERR_START
, EXT4_S_ERR_LEN
);
4647 err
= jbd2_journal_load(journal
);
4649 memcpy(((char *) es
) + EXT4_S_ERR_START
,
4650 save
, EXT4_S_ERR_LEN
);
4655 ext4_msg(sb
, KERN_ERR
, "error loading journal");
4656 jbd2_journal_destroy(journal
);
4660 EXT4_SB(sb
)->s_journal
= journal
;
4661 ext4_clear_journal_err(sb
, es
);
4663 if (!really_read_only
&& journal_devnum
&&
4664 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4665 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
4667 /* Make sure we flush the recovery flag to disk. */
4668 ext4_commit_super(sb
, 1);
4674 static int ext4_commit_super(struct super_block
*sb
, int sync
)
4676 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
4677 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
4680 if (!sbh
|| block_device_ejected(sb
))
4683 * If the file system is mounted read-only, don't update the
4684 * superblock write time. This avoids updating the superblock
4685 * write time when we are mounting the root file system
4686 * read/only but we need to replay the journal; at that point,
4687 * for people who are east of GMT and who make their clock
4688 * tick in localtime for Windows bug-for-bug compatibility,
4689 * the clock is set in the future, and this will cause e2fsck
4690 * to complain and force a full file system check.
4692 if (!(sb
->s_flags
& MS_RDONLY
))
4693 es
->s_wtime
= cpu_to_le32(get_seconds());
4694 if (sb
->s_bdev
->bd_part
)
4695 es
->s_kbytes_written
=
4696 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
4697 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
4698 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
4700 es
->s_kbytes_written
=
4701 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
);
4702 if (percpu_counter_initialized(&EXT4_SB(sb
)->s_freeclusters_counter
))
4703 ext4_free_blocks_count_set(es
,
4704 EXT4_C2B(EXT4_SB(sb
), percpu_counter_sum_positive(
4705 &EXT4_SB(sb
)->s_freeclusters_counter
)));
4706 if (percpu_counter_initialized(&EXT4_SB(sb
)->s_freeinodes_counter
))
4707 es
->s_free_inodes_count
=
4708 cpu_to_le32(percpu_counter_sum_positive(
4709 &EXT4_SB(sb
)->s_freeinodes_counter
));
4710 BUFFER_TRACE(sbh
, "marking dirty");
4711 ext4_superblock_csum_set(sb
);
4714 if (buffer_write_io_error(sbh
)) {
4716 * Oh, dear. A previous attempt to write the
4717 * superblock failed. This could happen because the
4718 * USB device was yanked out. Or it could happen to
4719 * be a transient write error and maybe the block will
4720 * be remapped. Nothing we can do but to retry the
4721 * write and hope for the best.
4723 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
4724 "superblock detected");
4725 clear_buffer_write_io_error(sbh
);
4726 set_buffer_uptodate(sbh
);
4728 mark_buffer_dirty(sbh
);
4731 error
= __sync_dirty_buffer(sbh
,
4732 REQ_SYNC
| (test_opt(sb
, BARRIER
) ? REQ_FUA
: 0));
4736 error
= buffer_write_io_error(sbh
);
4738 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
4740 clear_buffer_write_io_error(sbh
);
4741 set_buffer_uptodate(sbh
);
4748 * Have we just finished recovery? If so, and if we are mounting (or
4749 * remounting) the filesystem readonly, then we will end up with a
4750 * consistent fs on disk. Record that fact.
4752 static void ext4_mark_recovery_complete(struct super_block
*sb
,
4753 struct ext4_super_block
*es
)
4755 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
4757 if (!ext4_has_feature_journal(sb
)) {
4758 BUG_ON(journal
!= NULL
);
4761 jbd2_journal_lock_updates(journal
);
4762 if (jbd2_journal_flush(journal
) < 0)
4765 if (ext4_has_feature_journal_needs_recovery(sb
) && sb_rdonly(sb
)) {
4766 ext4_clear_feature_journal_needs_recovery(sb
);
4767 ext4_commit_super(sb
, 1);
4771 jbd2_journal_unlock_updates(journal
);
4775 * If we are mounting (or read-write remounting) a filesystem whose journal
4776 * has recorded an error from a previous lifetime, move that error to the
4777 * main filesystem now.
4779 static void ext4_clear_journal_err(struct super_block
*sb
,
4780 struct ext4_super_block
*es
)
4786 BUG_ON(!ext4_has_feature_journal(sb
));
4788 journal
= EXT4_SB(sb
)->s_journal
;
4791 * Now check for any error status which may have been recorded in the
4792 * journal by a prior ext4_error() or ext4_abort()
4795 j_errno
= jbd2_journal_errno(journal
);
4799 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
4800 ext4_warning(sb
, "Filesystem error recorded "
4801 "from previous mount: %s", errstr
);
4802 ext4_warning(sb
, "Marking fs in need of filesystem check.");
4804 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
4805 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
4806 ext4_commit_super(sb
, 1);
4808 jbd2_journal_clear_err(journal
);
4809 jbd2_journal_update_sb_errno(journal
);
4814 * Force the running and committing transactions to commit,
4815 * and wait on the commit.
4817 int ext4_force_commit(struct super_block
*sb
)
4824 journal
= EXT4_SB(sb
)->s_journal
;
4825 return ext4_journal_force_commit(journal
);
4828 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
4832 bool needs_barrier
= false;
4833 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4835 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
4838 trace_ext4_sync_fs(sb
, wait
);
4839 flush_workqueue(sbi
->rsv_conversion_wq
);
4841 * Writeback quota in non-journalled quota case - journalled quota has
4844 dquot_writeback_dquots(sb
, -1);
4846 * Data writeback is possible w/o journal transaction, so barrier must
4847 * being sent at the end of the function. But we can skip it if
4848 * transaction_commit will do it for us.
4850 if (sbi
->s_journal
) {
4851 target
= jbd2_get_latest_transaction(sbi
->s_journal
);
4852 if (wait
&& sbi
->s_journal
->j_flags
& JBD2_BARRIER
&&
4853 !jbd2_trans_will_send_data_barrier(sbi
->s_journal
, target
))
4854 needs_barrier
= true;
4856 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
4858 ret
= jbd2_log_wait_commit(sbi
->s_journal
,
4861 } else if (wait
&& test_opt(sb
, BARRIER
))
4862 needs_barrier
= true;
4863 if (needs_barrier
) {
4865 err
= blkdev_issue_flush(sb
->s_bdev
, GFP_KERNEL
, NULL
);
4874 * LVM calls this function before a (read-only) snapshot is created. This
4875 * gives us a chance to flush the journal completely and mark the fs clean.
4877 * Note that only this function cannot bring a filesystem to be in a clean
4878 * state independently. It relies on upper layer to stop all data & metadata
4881 static int ext4_freeze(struct super_block
*sb
)
4889 journal
= EXT4_SB(sb
)->s_journal
;
4892 /* Now we set up the journal barrier. */
4893 jbd2_journal_lock_updates(journal
);
4896 * Don't clear the needs_recovery flag if we failed to
4897 * flush the journal.
4899 error
= jbd2_journal_flush(journal
);
4903 /* Journal blocked and flushed, clear needs_recovery flag. */
4904 ext4_clear_feature_journal_needs_recovery(sb
);
4907 error
= ext4_commit_super(sb
, 1);
4910 /* we rely on upper layer to stop further updates */
4911 jbd2_journal_unlock_updates(journal
);
4916 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4917 * flag here, even though the filesystem is not technically dirty yet.
4919 static int ext4_unfreeze(struct super_block
*sb
)
4921 if (sb_rdonly(sb
) || ext4_forced_shutdown(EXT4_SB(sb
)))
4924 if (EXT4_SB(sb
)->s_journal
) {
4925 /* Reset the needs_recovery flag before the fs is unlocked. */
4926 ext4_set_feature_journal_needs_recovery(sb
);
4929 ext4_commit_super(sb
, 1);
4934 * Structure to save mount options for ext4_remount's benefit
4936 struct ext4_mount_options
{
4937 unsigned long s_mount_opt
;
4938 unsigned long s_mount_opt2
;
4941 unsigned long s_commit_interval
;
4942 u32 s_min_batch_time
, s_max_batch_time
;
4945 char *s_qf_names
[EXT4_MAXQUOTAS
];
4949 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
4951 struct ext4_super_block
*es
;
4952 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4953 unsigned long old_sb_flags
;
4954 struct ext4_mount_options old_opts
;
4955 int enable_quota
= 0;
4957 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
4962 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
4964 /* Store the original options */
4965 old_sb_flags
= sb
->s_flags
;
4966 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
4967 old_opts
.s_mount_opt2
= sbi
->s_mount_opt2
;
4968 old_opts
.s_resuid
= sbi
->s_resuid
;
4969 old_opts
.s_resgid
= sbi
->s_resgid
;
4970 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
4971 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
4972 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
4974 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
4975 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
4976 if (sbi
->s_qf_names
[i
]) {
4977 old_opts
.s_qf_names
[i
] = kstrdup(sbi
->s_qf_names
[i
],
4979 if (!old_opts
.s_qf_names
[i
]) {
4980 for (j
= 0; j
< i
; j
++)
4981 kfree(old_opts
.s_qf_names
[j
]);
4986 old_opts
.s_qf_names
[i
] = NULL
;
4988 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
4989 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
4991 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
, 1)) {
4996 if ((old_opts
.s_mount_opt
& EXT4_MOUNT_JOURNAL_CHECKSUM
) ^
4997 test_opt(sb
, JOURNAL_CHECKSUM
)) {
4998 ext4_msg(sb
, KERN_ERR
, "changing journal_checksum "
4999 "during remount not supported; ignoring");
5000 sbi
->s_mount_opt
^= EXT4_MOUNT_JOURNAL_CHECKSUM
;
5003 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
5004 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
5005 ext4_msg(sb
, KERN_ERR
, "can't mount with "
5006 "both data=journal and delalloc");
5010 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
5011 ext4_msg(sb
, KERN_ERR
, "can't mount with "
5012 "both data=journal and dioread_nolock");
5016 if (test_opt(sb
, DAX
)) {
5017 ext4_msg(sb
, KERN_ERR
, "can't mount with "
5018 "both data=journal and dax");
5022 } else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
) {
5023 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
5024 ext4_msg(sb
, KERN_ERR
, "can't mount with "
5025 "journal_async_commit in data=ordered mode");
5031 if ((sbi
->s_mount_opt
^ old_opts
.s_mount_opt
) & EXT4_MOUNT_NO_MBCACHE
) {
5032 ext4_msg(sb
, KERN_ERR
, "can't enable nombcache during remount");
5037 if ((sbi
->s_mount_opt
^ old_opts
.s_mount_opt
) & EXT4_MOUNT_DAX
) {
5038 ext4_msg(sb
, KERN_WARNING
, "warning: refusing change of "
5039 "dax flag with busy inodes while remounting");
5040 sbi
->s_mount_opt
^= EXT4_MOUNT_DAX
;
5043 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
5044 ext4_abort(sb
, "Abort forced by user");
5046 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
5047 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
5051 if (sbi
->s_journal
) {
5052 ext4_init_journal_params(sb
, sbi
->s_journal
);
5053 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
5056 if (*flags
& MS_LAZYTIME
)
5057 sb
->s_flags
|= MS_LAZYTIME
;
5059 if ((bool)(*flags
& MS_RDONLY
) != sb_rdonly(sb
)) {
5060 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
5065 if (*flags
& MS_RDONLY
) {
5066 err
= sync_filesystem(sb
);
5069 err
= dquot_suspend(sb
, -1);
5074 * First of all, the unconditional stuff we have to do
5075 * to disable replay of the journal when we next remount
5077 sb
->s_flags
|= MS_RDONLY
;
5080 * OK, test if we are remounting a valid rw partition
5081 * readonly, and if so set the rdonly flag and then
5082 * mark the partition as valid again.
5084 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
5085 (sbi
->s_mount_state
& EXT4_VALID_FS
))
5086 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
5089 ext4_mark_recovery_complete(sb
, es
);
5091 /* Make sure we can mount this feature set readwrite */
5092 if (ext4_has_feature_readonly(sb
) ||
5093 !ext4_feature_set_ok(sb
, 0)) {
5098 * Make sure the group descriptor checksums
5099 * are sane. If they aren't, refuse to remount r/w.
5101 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
5102 struct ext4_group_desc
*gdp
=
5103 ext4_get_group_desc(sb
, g
, NULL
);
5105 if (!ext4_group_desc_csum_verify(sb
, g
, gdp
)) {
5106 ext4_msg(sb
, KERN_ERR
,
5107 "ext4_remount: Checksum for group %u failed (%u!=%u)",
5108 g
, le16_to_cpu(ext4_group_desc_csum(sb
, g
, gdp
)),
5109 le16_to_cpu(gdp
->bg_checksum
));
5116 * If we have an unprocessed orphan list hanging
5117 * around from a previously readonly bdev mount,
5118 * require a full umount/remount for now.
5120 if (es
->s_last_orphan
) {
5121 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
5122 "remount RDWR because of unprocessed "
5123 "orphan inode list. Please "
5124 "umount/remount instead");
5130 * Mounting a RDONLY partition read-write, so reread
5131 * and store the current valid flag. (It may have
5132 * been changed by e2fsck since we originally mounted
5136 ext4_clear_journal_err(sb
, es
);
5137 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
5138 if (!ext4_setup_super(sb
, es
, 0))
5139 sb
->s_flags
&= ~MS_RDONLY
;
5140 if (ext4_has_feature_mmp(sb
))
5141 if (ext4_multi_mount_protect(sb
,
5142 le64_to_cpu(es
->s_mmp_block
))) {
5151 * Reinitialize lazy itable initialization thread based on
5154 if (sb_rdonly(sb
) || !test_opt(sb
, INIT_INODE_TABLE
))
5155 ext4_unregister_li_request(sb
);
5157 ext4_group_t first_not_zeroed
;
5158 first_not_zeroed
= ext4_has_uninit_itable(sb
);
5159 ext4_register_li_request(sb
, first_not_zeroed
);
5162 ext4_setup_system_zone(sb
);
5163 if (sbi
->s_journal
== NULL
&& !(old_sb_flags
& MS_RDONLY
))
5164 ext4_commit_super(sb
, 1);
5167 /* Release old quota file names */
5168 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
5169 kfree(old_opts
.s_qf_names
[i
]);
5171 if (sb_any_quota_suspended(sb
))
5172 dquot_resume(sb
, -1);
5173 else if (ext4_has_feature_quota(sb
)) {
5174 err
= ext4_enable_quotas(sb
);
5181 *flags
= (*flags
& ~MS_LAZYTIME
) | (sb
->s_flags
& MS_LAZYTIME
);
5182 ext4_msg(sb
, KERN_INFO
, "re-mounted. Opts: %s", orig_data
);
5187 sb
->s_flags
= old_sb_flags
;
5188 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
5189 sbi
->s_mount_opt2
= old_opts
.s_mount_opt2
;
5190 sbi
->s_resuid
= old_opts
.s_resuid
;
5191 sbi
->s_resgid
= old_opts
.s_resgid
;
5192 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
5193 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
5194 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
5196 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
5197 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++) {
5198 kfree(sbi
->s_qf_names
[i
]);
5199 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
5207 static int ext4_statfs_project(struct super_block
*sb
,
5208 kprojid_t projid
, struct kstatfs
*buf
)
5211 struct dquot
*dquot
;
5215 qid
= make_kqid_projid(projid
);
5216 dquot
= dqget(sb
, qid
);
5218 return PTR_ERR(dquot
);
5219 spin_lock(&dquot
->dq_dqb_lock
);
5221 limit
= (dquot
->dq_dqb
.dqb_bsoftlimit
?
5222 dquot
->dq_dqb
.dqb_bsoftlimit
:
5223 dquot
->dq_dqb
.dqb_bhardlimit
) >> sb
->s_blocksize_bits
;
5224 if (limit
&& buf
->f_blocks
> limit
) {
5225 curblock
= dquot
->dq_dqb
.dqb_curspace
>> sb
->s_blocksize_bits
;
5226 buf
->f_blocks
= limit
;
5227 buf
->f_bfree
= buf
->f_bavail
=
5228 (buf
->f_blocks
> curblock
) ?
5229 (buf
->f_blocks
- curblock
) : 0;
5232 limit
= dquot
->dq_dqb
.dqb_isoftlimit
?
5233 dquot
->dq_dqb
.dqb_isoftlimit
:
5234 dquot
->dq_dqb
.dqb_ihardlimit
;
5235 if (limit
&& buf
->f_files
> limit
) {
5236 buf
->f_files
= limit
;
5238 (buf
->f_files
> dquot
->dq_dqb
.dqb_curinodes
) ?
5239 (buf
->f_files
- dquot
->dq_dqb
.dqb_curinodes
) : 0;
5242 spin_unlock(&dquot
->dq_dqb_lock
);
5248 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
5250 struct super_block
*sb
= dentry
->d_sb
;
5251 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
5252 struct ext4_super_block
*es
= sbi
->s_es
;
5253 ext4_fsblk_t overhead
= 0, resv_blocks
;
5256 resv_blocks
= EXT4_C2B(sbi
, atomic64_read(&sbi
->s_resv_clusters
));
5258 if (!test_opt(sb
, MINIX_DF
))
5259 overhead
= sbi
->s_overhead
;
5261 buf
->f_type
= EXT4_SUPER_MAGIC
;
5262 buf
->f_bsize
= sb
->s_blocksize
;
5263 buf
->f_blocks
= ext4_blocks_count(es
) - EXT4_C2B(sbi
, overhead
);
5264 bfree
= percpu_counter_sum_positive(&sbi
->s_freeclusters_counter
) -
5265 percpu_counter_sum_positive(&sbi
->s_dirtyclusters_counter
);
5266 /* prevent underflow in case that few free space is available */
5267 buf
->f_bfree
= EXT4_C2B(sbi
, max_t(s64
, bfree
, 0));
5268 buf
->f_bavail
= buf
->f_bfree
-
5269 (ext4_r_blocks_count(es
) + resv_blocks
);
5270 if (buf
->f_bfree
< (ext4_r_blocks_count(es
) + resv_blocks
))
5272 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
5273 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
5274 buf
->f_namelen
= EXT4_NAME_LEN
;
5275 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
5276 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
5277 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
5278 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
5281 if (ext4_test_inode_flag(dentry
->d_inode
, EXT4_INODE_PROJINHERIT
) &&
5282 sb_has_quota_limits_enabled(sb
, PRJQUOTA
))
5283 ext4_statfs_project(sb
, EXT4_I(dentry
->d_inode
)->i_projid
, buf
);
5292 * Helper functions so that transaction is started before we acquire dqio_sem
5293 * to keep correct lock ordering of transaction > dqio_sem
5295 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
5297 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_id
.type
];
5300 static int ext4_write_dquot(struct dquot
*dquot
)
5304 struct inode
*inode
;
5306 inode
= dquot_to_inode(dquot
);
5307 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
,
5308 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
5310 return PTR_ERR(handle
);
5311 ret
= dquot_commit(dquot
);
5312 err
= ext4_journal_stop(handle
);
5318 static int ext4_acquire_dquot(struct dquot
*dquot
)
5323 handle
= ext4_journal_start(dquot_to_inode(dquot
), EXT4_HT_QUOTA
,
5324 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
5326 return PTR_ERR(handle
);
5327 ret
= dquot_acquire(dquot
);
5328 err
= ext4_journal_stop(handle
);
5334 static int ext4_release_dquot(struct dquot
*dquot
)
5339 handle
= ext4_journal_start(dquot_to_inode(dquot
), EXT4_HT_QUOTA
,
5340 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
5341 if (IS_ERR(handle
)) {
5342 /* Release dquot anyway to avoid endless cycle in dqput() */
5343 dquot_release(dquot
);
5344 return PTR_ERR(handle
);
5346 ret
= dquot_release(dquot
);
5347 err
= ext4_journal_stop(handle
);
5353 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
5355 struct super_block
*sb
= dquot
->dq_sb
;
5356 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
5358 /* Are we journaling quotas? */
5359 if (ext4_has_feature_quota(sb
) ||
5360 sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
5361 dquot_mark_dquot_dirty(dquot
);
5362 return ext4_write_dquot(dquot
);
5364 return dquot_mark_dquot_dirty(dquot
);
5368 static int ext4_write_info(struct super_block
*sb
, int type
)
5373 /* Data block + inode block */
5374 handle
= ext4_journal_start(d_inode(sb
->s_root
), EXT4_HT_QUOTA
, 2);
5376 return PTR_ERR(handle
);
5377 ret
= dquot_commit_info(sb
, type
);
5378 err
= ext4_journal_stop(handle
);
5385 * Turn on quotas during mount time - we need to find
5386 * the quota file and such...
5388 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
5390 return dquot_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
5391 EXT4_SB(sb
)->s_jquota_fmt
, type
);
5394 static void lockdep_set_quota_inode(struct inode
*inode
, int subclass
)
5396 struct ext4_inode_info
*ei
= EXT4_I(inode
);
5398 /* The first argument of lockdep_set_subclass has to be
5399 * *exactly* the same as the argument to init_rwsem() --- in
5400 * this case, in init_once() --- or lockdep gets unhappy
5401 * because the name of the lock is set using the
5402 * stringification of the argument to init_rwsem().
5404 (void) ei
; /* shut up clang warning if !CONFIG_LOCKDEP */
5405 lockdep_set_subclass(&ei
->i_data_sem
, subclass
);
5409 * Standard function to be called on quota_on
5411 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
5412 const struct path
*path
)
5416 if (!test_opt(sb
, QUOTA
))
5419 /* Quotafile not on the same filesystem? */
5420 if (path
->dentry
->d_sb
!= sb
)
5422 /* Journaling quota? */
5423 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
5424 /* Quotafile not in fs root? */
5425 if (path
->dentry
->d_parent
!= sb
->s_root
)
5426 ext4_msg(sb
, KERN_WARNING
,
5427 "Quota file not on filesystem root. "
5428 "Journaled quota will not work");
5429 sb_dqopt(sb
)->flags
|= DQUOT_NOLIST_DIRTY
;
5432 * Clear the flag just in case mount options changed since
5435 sb_dqopt(sb
)->flags
&= ~DQUOT_NOLIST_DIRTY
;
5439 * When we journal data on quota file, we have to flush journal to see
5440 * all updates to the file when we bypass pagecache...
5442 if (EXT4_SB(sb
)->s_journal
&&
5443 ext4_should_journal_data(d_inode(path
->dentry
))) {
5445 * We don't need to lock updates but journal_flush() could
5446 * otherwise be livelocked...
5448 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
5449 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
5450 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
5455 lockdep_set_quota_inode(path
->dentry
->d_inode
, I_DATA_SEM_QUOTA
);
5456 err
= dquot_quota_on(sb
, type
, format_id
, path
);
5458 lockdep_set_quota_inode(path
->dentry
->d_inode
,
5461 struct inode
*inode
= d_inode(path
->dentry
);
5465 * Set inode flags to prevent userspace from messing with quota
5466 * files. If this fails, we return success anyway since quotas
5467 * are already enabled and this is not a hard failure.
5470 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
, 1);
5473 EXT4_I(inode
)->i_flags
|= EXT4_NOATIME_FL
| EXT4_IMMUTABLE_FL
;
5474 inode_set_flags(inode
, S_NOATIME
| S_IMMUTABLE
,
5475 S_NOATIME
| S_IMMUTABLE
);
5476 ext4_mark_inode_dirty(handle
, inode
);
5477 ext4_journal_stop(handle
);
5479 inode_unlock(inode
);
5484 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
5488 struct inode
*qf_inode
;
5489 unsigned long qf_inums
[EXT4_MAXQUOTAS
] = {
5490 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
5491 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
),
5492 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_prj_quota_inum
)
5495 BUG_ON(!ext4_has_feature_quota(sb
));
5497 if (!qf_inums
[type
])
5500 qf_inode
= ext4_iget(sb
, qf_inums
[type
]);
5501 if (IS_ERR(qf_inode
)) {
5502 ext4_error(sb
, "Bad quota inode # %lu", qf_inums
[type
]);
5503 return PTR_ERR(qf_inode
);
5506 /* Don't account quota for quota files to avoid recursion */
5507 qf_inode
->i_flags
|= S_NOQUOTA
;
5508 lockdep_set_quota_inode(qf_inode
, I_DATA_SEM_QUOTA
);
5509 err
= dquot_enable(qf_inode
, type
, format_id
, flags
);
5512 lockdep_set_quota_inode(qf_inode
, I_DATA_SEM_NORMAL
);
5517 /* Enable usage tracking for all quota types. */
5518 static int ext4_enable_quotas(struct super_block
*sb
)
5521 unsigned long qf_inums
[EXT4_MAXQUOTAS
] = {
5522 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
5523 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
),
5524 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_prj_quota_inum
)
5526 bool quota_mopt
[EXT4_MAXQUOTAS
] = {
5527 test_opt(sb
, USRQUOTA
),
5528 test_opt(sb
, GRPQUOTA
),
5529 test_opt(sb
, PRJQUOTA
),
5532 sb_dqopt(sb
)->flags
|= DQUOT_QUOTA_SYS_FILE
| DQUOT_NOLIST_DIRTY
;
5533 for (type
= 0; type
< EXT4_MAXQUOTAS
; type
++) {
5534 if (qf_inums
[type
]) {
5535 err
= ext4_quota_enable(sb
, type
, QFMT_VFS_V1
,
5536 DQUOT_USAGE_ENABLED
|
5537 (quota_mopt
[type
] ? DQUOT_LIMITS_ENABLED
: 0));
5539 for (type
--; type
>= 0; type
--)
5540 dquot_quota_off(sb
, type
);
5543 "Failed to enable quota tracking "
5544 "(type=%d, err=%d). Please run "
5545 "e2fsck to fix.", type
, err
);
5553 static int ext4_quota_off(struct super_block
*sb
, int type
)
5555 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5559 /* Force all delayed allocation blocks to be allocated.
5560 * Caller already holds s_umount sem */
5561 if (test_opt(sb
, DELALLOC
))
5562 sync_filesystem(sb
);
5564 if (!inode
|| !igrab(inode
))
5567 err
= dquot_quota_off(sb
, type
);
5568 if (err
|| ext4_has_feature_quota(sb
))
5573 * Update modification times of quota files when userspace can
5574 * start looking at them. If we fail, we return success anyway since
5575 * this is not a hard failure and quotas are already disabled.
5577 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
, 1);
5580 EXT4_I(inode
)->i_flags
&= ~(EXT4_NOATIME_FL
| EXT4_IMMUTABLE_FL
);
5581 inode_set_flags(inode
, 0, S_NOATIME
| S_IMMUTABLE
);
5582 inode
->i_mtime
= inode
->i_ctime
= current_time(inode
);
5583 ext4_mark_inode_dirty(handle
, inode
);
5584 ext4_journal_stop(handle
);
5586 inode_unlock(inode
);
5588 lockdep_set_quota_inode(inode
, I_DATA_SEM_NORMAL
);
5592 return dquot_quota_off(sb
, type
);
5595 /* Read data from quotafile - avoid pagecache and such because we cannot afford
5596 * acquiring the locks... As quota files are never truncated and quota code
5597 * itself serializes the operations (and no one else should touch the files)
5598 * we don't have to be afraid of races */
5599 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
5600 size_t len
, loff_t off
)
5602 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5603 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5604 int offset
= off
& (sb
->s_blocksize
- 1);
5607 struct buffer_head
*bh
;
5608 loff_t i_size
= i_size_read(inode
);
5612 if (off
+len
> i_size
)
5615 while (toread
> 0) {
5616 tocopy
= sb
->s_blocksize
- offset
< toread
?
5617 sb
->s_blocksize
- offset
: toread
;
5618 bh
= ext4_bread(NULL
, inode
, blk
, 0);
5621 if (!bh
) /* A hole? */
5622 memset(data
, 0, tocopy
);
5624 memcpy(data
, bh
->b_data
+offset
, tocopy
);
5634 /* Write to quotafile (we know the transaction is already started and has
5635 * enough credits) */
5636 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
5637 const char *data
, size_t len
, loff_t off
)
5639 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5640 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5641 int err
, offset
= off
& (sb
->s_blocksize
- 1);
5643 struct buffer_head
*bh
;
5644 handle_t
*handle
= journal_current_handle();
5646 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
5647 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5648 " cancelled because transaction is not started",
5649 (unsigned long long)off
, (unsigned long long)len
);
5653 * Since we account only one data block in transaction credits,
5654 * then it is impossible to cross a block boundary.
5656 if (sb
->s_blocksize
- offset
< len
) {
5657 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5658 " cancelled because not block aligned",
5659 (unsigned long long)off
, (unsigned long long)len
);
5664 bh
= ext4_bread(handle
, inode
, blk
,
5665 EXT4_GET_BLOCKS_CREATE
|
5666 EXT4_GET_BLOCKS_METADATA_NOFAIL
);
5667 } while (IS_ERR(bh
) && (PTR_ERR(bh
) == -ENOSPC
) &&
5668 ext4_should_retry_alloc(inode
->i_sb
, &retries
));
5673 BUFFER_TRACE(bh
, "get write access");
5674 err
= ext4_journal_get_write_access(handle
, bh
);
5680 memcpy(bh
->b_data
+offset
, data
, len
);
5681 flush_dcache_page(bh
->b_page
);
5683 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
5686 if (inode
->i_size
< off
+ len
) {
5687 i_size_write(inode
, off
+ len
);
5688 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
5689 ext4_mark_inode_dirty(handle
, inode
);
5694 static int ext4_get_next_id(struct super_block
*sb
, struct kqid
*qid
)
5696 const struct quota_format_ops
*ops
;
5698 if (!sb_has_quota_loaded(sb
, qid
->type
))
5700 ops
= sb_dqopt(sb
)->ops
[qid
->type
];
5701 if (!ops
|| !ops
->get_next_id
)
5703 return dquot_get_next_id(sb
, qid
);
5707 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
5708 const char *dev_name
, void *data
)
5710 return mount_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
);
5713 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
5714 static inline void register_as_ext2(void)
5716 int err
= register_filesystem(&ext2_fs_type
);
5719 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
5722 static inline void unregister_as_ext2(void)
5724 unregister_filesystem(&ext2_fs_type
);
5727 static inline int ext2_feature_set_ok(struct super_block
*sb
)
5729 if (ext4_has_unknown_ext2_incompat_features(sb
))
5733 if (ext4_has_unknown_ext2_ro_compat_features(sb
))
5738 static inline void register_as_ext2(void) { }
5739 static inline void unregister_as_ext2(void) { }
5740 static inline int ext2_feature_set_ok(struct super_block
*sb
) { return 0; }
5743 static inline void register_as_ext3(void)
5745 int err
= register_filesystem(&ext3_fs_type
);
5748 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
5751 static inline void unregister_as_ext3(void)
5753 unregister_filesystem(&ext3_fs_type
);
5756 static inline int ext3_feature_set_ok(struct super_block
*sb
)
5758 if (ext4_has_unknown_ext3_incompat_features(sb
))
5760 if (!ext4_has_feature_journal(sb
))
5764 if (ext4_has_unknown_ext3_ro_compat_features(sb
))
5769 static struct file_system_type ext4_fs_type
= {
5770 .owner
= THIS_MODULE
,
5772 .mount
= ext4_mount
,
5773 .kill_sb
= kill_block_super
,
5774 .fs_flags
= FS_REQUIRES_DEV
,
5776 MODULE_ALIAS_FS("ext4");
5778 /* Shared across all ext4 file systems */
5779 wait_queue_head_t ext4__ioend_wq
[EXT4_WQ_HASH_SZ
];
5781 static int __init
ext4_init_fs(void)
5785 ratelimit_state_init(&ext4_mount_msg_ratelimit
, 30 * HZ
, 64);
5786 ext4_li_info
= NULL
;
5787 mutex_init(&ext4_li_mtx
);
5789 /* Build-time check for flags consistency */
5790 ext4_check_flag_values();
5792 for (i
= 0; i
< EXT4_WQ_HASH_SZ
; i
++)
5793 init_waitqueue_head(&ext4__ioend_wq
[i
]);
5795 err
= ext4_init_es();
5799 err
= ext4_init_pageio();
5803 err
= ext4_init_system_zone();
5807 err
= ext4_init_sysfs();
5811 err
= ext4_init_mballoc();
5814 err
= init_inodecache();
5819 err
= register_filesystem(&ext4_fs_type
);
5825 unregister_as_ext2();
5826 unregister_as_ext3();
5827 destroy_inodecache();
5829 ext4_exit_mballoc();
5833 ext4_exit_system_zone();
5842 static void __exit
ext4_exit_fs(void)
5844 ext4_destroy_lazyinit_thread();
5845 unregister_as_ext2();
5846 unregister_as_ext3();
5847 unregister_filesystem(&ext4_fs_type
);
5848 destroy_inodecache();
5849 ext4_exit_mballoc();
5851 ext4_exit_system_zone();
5856 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5857 MODULE_DESCRIPTION("Fourth Extended Filesystem");
5858 MODULE_LICENSE("GPL");
5859 module_init(ext4_init_fs
)
5860 module_exit(ext4_exit_fs
)