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/cleancache.h>
41 #include <linux/uaccess.h>
43 #include <linux/kthread.h>
44 #include <linux/freezer.h>
47 #include "ext4_extents.h" /* Needed for trace points definition */
48 #include "ext4_jbd2.h"
53 #define CREATE_TRACE_POINTS
54 #include <trace/events/ext4.h>
56 static struct ext4_lazy_init
*ext4_li_info
;
57 static struct mutex ext4_li_mtx
;
58 static struct ratelimit_state ext4_mount_msg_ratelimit
;
60 static int ext4_load_journal(struct super_block
*, struct ext4_super_block
*,
61 unsigned long journal_devnum
);
62 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
);
63 static int ext4_commit_super(struct super_block
*sb
, int sync
);
64 static void ext4_mark_recovery_complete(struct super_block
*sb
,
65 struct ext4_super_block
*es
);
66 static void ext4_clear_journal_err(struct super_block
*sb
,
67 struct ext4_super_block
*es
);
68 static int ext4_sync_fs(struct super_block
*sb
, int wait
);
69 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
);
70 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
);
71 static int ext4_unfreeze(struct super_block
*sb
);
72 static int ext4_freeze(struct super_block
*sb
);
73 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
74 const char *dev_name
, void *data
);
75 static inline int ext2_feature_set_ok(struct super_block
*sb
);
76 static inline int ext3_feature_set_ok(struct super_block
*sb
);
77 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
);
78 static void ext4_destroy_lazyinit_thread(void);
79 static void ext4_unregister_li_request(struct super_block
*sb
);
80 static void ext4_clear_request_list(void);
81 static struct inode
*ext4_get_journal_inode(struct super_block
*sb
,
82 unsigned int journal_inum
);
87 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
88 * i_mmap_rwsem (inode->i_mmap_rwsem)!
91 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
92 * page lock -> i_data_sem (rw)
94 * buffered write path:
95 * sb_start_write -> i_mutex -> mmap_sem
96 * sb_start_write -> i_mutex -> transaction start -> page lock ->
100 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
101 * i_mmap_rwsem (w) -> page lock
102 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
103 * transaction start -> i_data_sem (rw)
106 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> mmap_sem
107 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) ->
108 * transaction start -> i_data_sem (rw)
111 * transaction start -> page lock(s) -> i_data_sem (rw)
114 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
115 static struct file_system_type ext2_fs_type
= {
116 .owner
= THIS_MODULE
,
119 .kill_sb
= kill_block_super
,
120 .fs_flags
= FS_REQUIRES_DEV
,
122 MODULE_ALIAS_FS("ext2");
123 MODULE_ALIAS("ext2");
124 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
126 #define IS_EXT2_SB(sb) (0)
130 static struct file_system_type ext3_fs_type
= {
131 .owner
= THIS_MODULE
,
134 .kill_sb
= kill_block_super
,
135 .fs_flags
= FS_REQUIRES_DEV
,
137 MODULE_ALIAS_FS("ext3");
138 MODULE_ALIAS("ext3");
139 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
141 static int ext4_verify_csum_type(struct super_block
*sb
,
142 struct ext4_super_block
*es
)
144 if (!ext4_has_feature_metadata_csum(sb
))
147 return es
->s_checksum_type
== EXT4_CRC32C_CHKSUM
;
150 static __le32
ext4_superblock_csum(struct super_block
*sb
,
151 struct ext4_super_block
*es
)
153 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
154 int offset
= offsetof(struct ext4_super_block
, s_checksum
);
157 csum
= ext4_chksum(sbi
, ~0, (char *)es
, offset
);
159 return cpu_to_le32(csum
);
162 static int ext4_superblock_csum_verify(struct super_block
*sb
,
163 struct ext4_super_block
*es
)
165 if (!ext4_has_metadata_csum(sb
))
168 return es
->s_checksum
== ext4_superblock_csum(sb
, es
);
171 void ext4_superblock_csum_set(struct super_block
*sb
)
173 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
175 if (!ext4_has_metadata_csum(sb
))
178 es
->s_checksum
= ext4_superblock_csum(sb
, es
);
181 void *ext4_kvmalloc(size_t size
, gfp_t flags
)
185 ret
= kmalloc(size
, flags
| __GFP_NOWARN
);
187 ret
= __vmalloc(size
, flags
, PAGE_KERNEL
);
191 void *ext4_kvzalloc(size_t size
, gfp_t flags
)
195 ret
= kzalloc(size
, flags
| __GFP_NOWARN
);
197 ret
= __vmalloc(size
, flags
| __GFP_ZERO
, PAGE_KERNEL
);
201 ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
202 struct ext4_group_desc
*bg
)
204 return le32_to_cpu(bg
->bg_block_bitmap_lo
) |
205 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
206 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
209 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
210 struct ext4_group_desc
*bg
)
212 return le32_to_cpu(bg
->bg_inode_bitmap_lo
) |
213 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
214 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
217 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
218 struct ext4_group_desc
*bg
)
220 return le32_to_cpu(bg
->bg_inode_table_lo
) |
221 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
222 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
225 __u32
ext4_free_group_clusters(struct super_block
*sb
,
226 struct ext4_group_desc
*bg
)
228 return le16_to_cpu(bg
->bg_free_blocks_count_lo
) |
229 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
230 (__u32
)le16_to_cpu(bg
->bg_free_blocks_count_hi
) << 16 : 0);
233 __u32
ext4_free_inodes_count(struct super_block
*sb
,
234 struct ext4_group_desc
*bg
)
236 return le16_to_cpu(bg
->bg_free_inodes_count_lo
) |
237 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
238 (__u32
)le16_to_cpu(bg
->bg_free_inodes_count_hi
) << 16 : 0);
241 __u32
ext4_used_dirs_count(struct super_block
*sb
,
242 struct ext4_group_desc
*bg
)
244 return le16_to_cpu(bg
->bg_used_dirs_count_lo
) |
245 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
246 (__u32
)le16_to_cpu(bg
->bg_used_dirs_count_hi
) << 16 : 0);
249 __u32
ext4_itable_unused_count(struct super_block
*sb
,
250 struct ext4_group_desc
*bg
)
252 return le16_to_cpu(bg
->bg_itable_unused_lo
) |
253 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
254 (__u32
)le16_to_cpu(bg
->bg_itable_unused_hi
) << 16 : 0);
257 void ext4_block_bitmap_set(struct super_block
*sb
,
258 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
260 bg
->bg_block_bitmap_lo
= cpu_to_le32((u32
)blk
);
261 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
262 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
265 void ext4_inode_bitmap_set(struct super_block
*sb
,
266 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
268 bg
->bg_inode_bitmap_lo
= cpu_to_le32((u32
)blk
);
269 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
270 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
273 void ext4_inode_table_set(struct super_block
*sb
,
274 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
276 bg
->bg_inode_table_lo
= cpu_to_le32((u32
)blk
);
277 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
278 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
281 void ext4_free_group_clusters_set(struct super_block
*sb
,
282 struct ext4_group_desc
*bg
, __u32 count
)
284 bg
->bg_free_blocks_count_lo
= cpu_to_le16((__u16
)count
);
285 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
286 bg
->bg_free_blocks_count_hi
= cpu_to_le16(count
>> 16);
289 void ext4_free_inodes_set(struct super_block
*sb
,
290 struct ext4_group_desc
*bg
, __u32 count
)
292 bg
->bg_free_inodes_count_lo
= cpu_to_le16((__u16
)count
);
293 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
294 bg
->bg_free_inodes_count_hi
= cpu_to_le16(count
>> 16);
297 void ext4_used_dirs_set(struct super_block
*sb
,
298 struct ext4_group_desc
*bg
, __u32 count
)
300 bg
->bg_used_dirs_count_lo
= cpu_to_le16((__u16
)count
);
301 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
302 bg
->bg_used_dirs_count_hi
= cpu_to_le16(count
>> 16);
305 void ext4_itable_unused_set(struct super_block
*sb
,
306 struct ext4_group_desc
*bg
, __u32 count
)
308 bg
->bg_itable_unused_lo
= cpu_to_le16((__u16
)count
);
309 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
310 bg
->bg_itable_unused_hi
= cpu_to_le16(count
>> 16);
314 static void __save_error_info(struct super_block
*sb
, const char *func
,
317 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
319 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
320 if (bdev_read_only(sb
->s_bdev
))
322 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
323 es
->s_last_error_time
= cpu_to_le32(get_seconds());
324 strncpy(es
->s_last_error_func
, func
, sizeof(es
->s_last_error_func
));
325 es
->s_last_error_line
= cpu_to_le32(line
);
326 if (!es
->s_first_error_time
) {
327 es
->s_first_error_time
= es
->s_last_error_time
;
328 strncpy(es
->s_first_error_func
, func
,
329 sizeof(es
->s_first_error_func
));
330 es
->s_first_error_line
= cpu_to_le32(line
);
331 es
->s_first_error_ino
= es
->s_last_error_ino
;
332 es
->s_first_error_block
= es
->s_last_error_block
;
335 * Start the daily error reporting function if it hasn't been
338 if (!es
->s_error_count
)
339 mod_timer(&EXT4_SB(sb
)->s_err_report
, jiffies
+ 24*60*60*HZ
);
340 le32_add_cpu(&es
->s_error_count
, 1);
343 static void save_error_info(struct super_block
*sb
, const char *func
,
346 __save_error_info(sb
, func
, line
);
347 ext4_commit_super(sb
, 1);
351 * The del_gendisk() function uninitializes the disk-specific data
352 * structures, including the bdi structure, without telling anyone
353 * else. Once this happens, any attempt to call mark_buffer_dirty()
354 * (for example, by ext4_commit_super), will cause a kernel OOPS.
355 * This is a kludge to prevent these oops until we can put in a proper
356 * hook in del_gendisk() to inform the VFS and file system layers.
358 static int block_device_ejected(struct super_block
*sb
)
360 struct inode
*bd_inode
= sb
->s_bdev
->bd_inode
;
361 struct backing_dev_info
*bdi
= inode_to_bdi(bd_inode
);
363 return bdi
->dev
== NULL
;
366 static void ext4_journal_commit_callback(journal_t
*journal
, transaction_t
*txn
)
368 struct super_block
*sb
= journal
->j_private
;
369 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
370 int error
= is_journal_aborted(journal
);
371 struct ext4_journal_cb_entry
*jce
;
373 BUG_ON(txn
->t_state
== T_FINISHED
);
374 spin_lock(&sbi
->s_md_lock
);
375 while (!list_empty(&txn
->t_private_list
)) {
376 jce
= list_entry(txn
->t_private_list
.next
,
377 struct ext4_journal_cb_entry
, jce_list
);
378 list_del_init(&jce
->jce_list
);
379 spin_unlock(&sbi
->s_md_lock
);
380 jce
->jce_func(sb
, jce
, error
);
381 spin_lock(&sbi
->s_md_lock
);
383 spin_unlock(&sbi
->s_md_lock
);
386 /* Deal with the reporting of failure conditions on a filesystem such as
387 * inconsistencies detected or read IO failures.
389 * On ext2, we can store the error state of the filesystem in the
390 * superblock. That is not possible on ext4, because we may have other
391 * write ordering constraints on the superblock which prevent us from
392 * writing it out straight away; and given that the journal is about to
393 * be aborted, we can't rely on the current, or future, transactions to
394 * write out the superblock safely.
396 * We'll just use the jbd2_journal_abort() error code to record an error in
397 * the journal instead. On recovery, the journal will complain about
398 * that error until we've noted it down and cleared it.
401 static void ext4_handle_error(struct super_block
*sb
)
403 if (sb
->s_flags
& MS_RDONLY
)
406 if (!test_opt(sb
, ERRORS_CONT
)) {
407 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
409 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
411 jbd2_journal_abort(journal
, -EIO
);
413 if (test_opt(sb
, ERRORS_RO
)) {
414 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
416 * Make sure updated value of ->s_mount_flags will be visible
417 * before ->s_flags update
420 sb
->s_flags
|= MS_RDONLY
;
422 if (test_opt(sb
, ERRORS_PANIC
)) {
423 if (EXT4_SB(sb
)->s_journal
&&
424 !(EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_REC_ERR
))
426 panic("EXT4-fs (device %s): panic forced after error\n",
431 #define ext4_error_ratelimit(sb) \
432 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
435 void __ext4_error(struct super_block
*sb
, const char *function
,
436 unsigned int line
, const char *fmt
, ...)
438 struct va_format vaf
;
441 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
444 if (ext4_error_ratelimit(sb
)) {
449 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
450 sb
->s_id
, function
, line
, current
->comm
, &vaf
);
453 save_error_info(sb
, function
, line
);
454 ext4_handle_error(sb
);
457 void __ext4_error_inode(struct inode
*inode
, const char *function
,
458 unsigned int line
, ext4_fsblk_t block
,
459 const char *fmt
, ...)
462 struct va_format vaf
;
463 struct ext4_super_block
*es
= EXT4_SB(inode
->i_sb
)->s_es
;
465 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode
->i_sb
))))
468 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
469 es
->s_last_error_block
= cpu_to_le64(block
);
470 if (ext4_error_ratelimit(inode
->i_sb
)) {
475 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
476 "inode #%lu: block %llu: comm %s: %pV\n",
477 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
478 block
, current
->comm
, &vaf
);
480 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
481 "inode #%lu: comm %s: %pV\n",
482 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
483 current
->comm
, &vaf
);
486 save_error_info(inode
->i_sb
, function
, line
);
487 ext4_handle_error(inode
->i_sb
);
490 void __ext4_error_file(struct file
*file
, const char *function
,
491 unsigned int line
, ext4_fsblk_t block
,
492 const char *fmt
, ...)
495 struct va_format vaf
;
496 struct ext4_super_block
*es
;
497 struct inode
*inode
= file_inode(file
);
498 char pathname
[80], *path
;
500 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode
->i_sb
))))
503 es
= EXT4_SB(inode
->i_sb
)->s_es
;
504 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
505 if (ext4_error_ratelimit(inode
->i_sb
)) {
506 path
= file_path(file
, pathname
, sizeof(pathname
));
514 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
515 "block %llu: comm %s: path %s: %pV\n",
516 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
517 block
, current
->comm
, path
, &vaf
);
520 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
521 "comm %s: path %s: %pV\n",
522 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
523 current
->comm
, path
, &vaf
);
526 save_error_info(inode
->i_sb
, function
, line
);
527 ext4_handle_error(inode
->i_sb
);
530 const char *ext4_decode_error(struct super_block
*sb
, int errno
,
537 errstr
= "Corrupt filesystem";
540 errstr
= "Filesystem failed CRC";
543 errstr
= "IO failure";
546 errstr
= "Out of memory";
549 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
550 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
551 errstr
= "Journal has aborted";
553 errstr
= "Readonly filesystem";
556 /* If the caller passed in an extra buffer for unknown
557 * errors, textualise them now. Else we just return
560 /* Check for truncated error codes... */
561 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
570 /* __ext4_std_error decodes expected errors from journaling functions
571 * automatically and invokes the appropriate error response. */
573 void __ext4_std_error(struct super_block
*sb
, const char *function
,
574 unsigned int line
, int errno
)
579 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
582 /* Special case: if the error is EROFS, and we're not already
583 * inside a transaction, then there's really no point in logging
585 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
586 (sb
->s_flags
& MS_RDONLY
))
589 if (ext4_error_ratelimit(sb
)) {
590 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
591 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s:%d: %s\n",
592 sb
->s_id
, function
, line
, errstr
);
595 save_error_info(sb
, function
, line
);
596 ext4_handle_error(sb
);
600 * ext4_abort is a much stronger failure handler than ext4_error. The
601 * abort function may be used to deal with unrecoverable failures such
602 * as journal IO errors or ENOMEM at a critical moment in log management.
604 * We unconditionally force the filesystem into an ABORT|READONLY state,
605 * unless the error response on the fs has been set to panic in which
606 * case we take the easy way out and panic immediately.
609 void __ext4_abort(struct super_block
*sb
, const char *function
,
610 unsigned int line
, const char *fmt
, ...)
612 struct va_format vaf
;
615 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
618 save_error_info(sb
, function
, line
);
622 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: %pV\n",
623 sb
->s_id
, function
, line
, &vaf
);
626 if ((sb
->s_flags
& MS_RDONLY
) == 0) {
627 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
628 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
630 * Make sure updated value of ->s_mount_flags will be visible
631 * before ->s_flags update
634 sb
->s_flags
|= MS_RDONLY
;
635 if (EXT4_SB(sb
)->s_journal
)
636 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
637 save_error_info(sb
, function
, line
);
639 if (test_opt(sb
, ERRORS_PANIC
)) {
640 if (EXT4_SB(sb
)->s_journal
&&
641 !(EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_REC_ERR
))
643 panic("EXT4-fs panic from previous error\n");
647 void __ext4_msg(struct super_block
*sb
,
648 const char *prefix
, const char *fmt
, ...)
650 struct va_format vaf
;
653 if (!___ratelimit(&(EXT4_SB(sb
)->s_msg_ratelimit_state
), "EXT4-fs"))
659 printk("%sEXT4-fs (%s): %pV\n", prefix
, sb
->s_id
, &vaf
);
663 #define ext4_warning_ratelimit(sb) \
664 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
667 void __ext4_warning(struct super_block
*sb
, const char *function
,
668 unsigned int line
, const char *fmt
, ...)
670 struct va_format vaf
;
673 if (!ext4_warning_ratelimit(sb
))
679 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: %pV\n",
680 sb
->s_id
, function
, line
, &vaf
);
684 void __ext4_warning_inode(const struct inode
*inode
, const char *function
,
685 unsigned int line
, const char *fmt
, ...)
687 struct va_format vaf
;
690 if (!ext4_warning_ratelimit(inode
->i_sb
))
696 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: "
697 "inode #%lu: comm %s: %pV\n", inode
->i_sb
->s_id
,
698 function
, line
, inode
->i_ino
, current
->comm
, &vaf
);
702 void __ext4_grp_locked_error(const char *function
, unsigned int line
,
703 struct super_block
*sb
, ext4_group_t grp
,
704 unsigned long ino
, ext4_fsblk_t block
,
705 const char *fmt
, ...)
709 struct va_format vaf
;
711 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
713 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
716 es
->s_last_error_ino
= cpu_to_le32(ino
);
717 es
->s_last_error_block
= cpu_to_le64(block
);
718 __save_error_info(sb
, function
, line
);
720 if (ext4_error_ratelimit(sb
)) {
724 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: group %u, ",
725 sb
->s_id
, function
, line
, grp
);
727 printk(KERN_CONT
"inode %lu: ", ino
);
729 printk(KERN_CONT
"block %llu:",
730 (unsigned long long) block
);
731 printk(KERN_CONT
"%pV\n", &vaf
);
735 if (test_opt(sb
, ERRORS_CONT
)) {
736 ext4_commit_super(sb
, 0);
740 ext4_unlock_group(sb
, grp
);
741 ext4_handle_error(sb
);
743 * We only get here in the ERRORS_RO case; relocking the group
744 * may be dangerous, but nothing bad will happen since the
745 * filesystem will have already been marked read/only and the
746 * journal has been aborted. We return 1 as a hint to callers
747 * who might what to use the return value from
748 * ext4_grp_locked_error() to distinguish between the
749 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
750 * aggressively from the ext4 function in question, with a
751 * more appropriate error code.
753 ext4_lock_group(sb
, grp
);
757 void ext4_update_dynamic_rev(struct super_block
*sb
)
759 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
761 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
765 "updating to rev %d because of new feature flag, "
766 "running e2fsck is recommended",
769 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
770 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
771 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
772 /* leave es->s_feature_*compat flags alone */
773 /* es->s_uuid will be set by e2fsck if empty */
776 * The rest of the superblock fields should be zero, and if not it
777 * means they are likely already in use, so leave them alone. We
778 * can leave it up to e2fsck to clean up any inconsistencies there.
783 * Open the external journal device
785 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
787 struct block_device
*bdev
;
788 char b
[BDEVNAME_SIZE
];
790 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
, sb
);
796 ext4_msg(sb
, KERN_ERR
, "failed to open journal device %s: %ld",
797 __bdevname(dev
, b
), PTR_ERR(bdev
));
802 * Release the journal device
804 static void ext4_blkdev_put(struct block_device
*bdev
)
806 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
809 static void ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
811 struct block_device
*bdev
;
812 bdev
= sbi
->journal_bdev
;
814 ext4_blkdev_put(bdev
);
815 sbi
->journal_bdev
= NULL
;
819 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
821 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
824 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
828 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
829 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
831 printk(KERN_ERR
"sb_info orphan list:\n");
832 list_for_each(l
, &sbi
->s_orphan
) {
833 struct inode
*inode
= orphan_list_entry(l
);
835 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
836 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
837 inode
->i_mode
, inode
->i_nlink
,
842 static void ext4_put_super(struct super_block
*sb
)
844 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
845 struct ext4_super_block
*es
= sbi
->s_es
;
849 ext4_unregister_li_request(sb
);
850 dquot_disable(sb
, -1, DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
852 flush_workqueue(sbi
->rsv_conversion_wq
);
853 destroy_workqueue(sbi
->rsv_conversion_wq
);
855 if (sbi
->s_journal
) {
856 aborted
= is_journal_aborted(sbi
->s_journal
);
857 err
= jbd2_journal_destroy(sbi
->s_journal
);
858 sbi
->s_journal
= NULL
;
859 if ((err
< 0) && !aborted
)
860 ext4_abort(sb
, "Couldn't clean up the journal");
863 ext4_unregister_sysfs(sb
);
864 ext4_es_unregister_shrinker(sbi
);
865 del_timer_sync(&sbi
->s_err_report
);
866 ext4_release_system_zone(sb
);
868 ext4_ext_release(sb
);
870 if (!(sb
->s_flags
& MS_RDONLY
) && !aborted
) {
871 ext4_clear_feature_journal_needs_recovery(sb
);
872 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
874 if (!(sb
->s_flags
& MS_RDONLY
))
875 ext4_commit_super(sb
, 1);
877 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
878 brelse(sbi
->s_group_desc
[i
]);
879 kvfree(sbi
->s_group_desc
);
880 kvfree(sbi
->s_flex_groups
);
881 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
882 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
883 percpu_counter_destroy(&sbi
->s_dirs_counter
);
884 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
885 percpu_free_rwsem(&sbi
->s_journal_flag_rwsem
);
887 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
888 kfree(sbi
->s_qf_names
[i
]);
891 /* Debugging code just in case the in-memory inode orphan list
892 * isn't empty. The on-disk one can be non-empty if we've
893 * detected an error and taken the fs readonly, but the
894 * in-memory list had better be clean by this point. */
895 if (!list_empty(&sbi
->s_orphan
))
896 dump_orphan_list(sb
, sbi
);
897 J_ASSERT(list_empty(&sbi
->s_orphan
));
899 sync_blockdev(sb
->s_bdev
);
900 invalidate_bdev(sb
->s_bdev
);
901 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
903 * Invalidate the journal device's buffers. We don't want them
904 * floating about in memory - the physical journal device may
905 * hotswapped, and it breaks the `ro-after' testing code.
907 sync_blockdev(sbi
->journal_bdev
);
908 invalidate_bdev(sbi
->journal_bdev
);
909 ext4_blkdev_remove(sbi
);
911 if (sbi
->s_mb_cache
) {
912 ext4_xattr_destroy_cache(sbi
->s_mb_cache
);
913 sbi
->s_mb_cache
= NULL
;
916 kthread_stop(sbi
->s_mmp_tsk
);
918 sb
->s_fs_info
= NULL
;
920 * Now that we are completely done shutting down the
921 * superblock, we need to actually destroy the kobject.
923 kobject_put(&sbi
->s_kobj
);
924 wait_for_completion(&sbi
->s_kobj_unregister
);
925 if (sbi
->s_chksum_driver
)
926 crypto_free_shash(sbi
->s_chksum_driver
);
927 kfree(sbi
->s_blockgroup_lock
);
931 static struct kmem_cache
*ext4_inode_cachep
;
934 * Called inside transaction, so use GFP_NOFS
936 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
938 struct ext4_inode_info
*ei
;
940 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
944 ei
->vfs_inode
.i_version
= 1;
945 spin_lock_init(&ei
->i_raw_lock
);
946 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
947 spin_lock_init(&ei
->i_prealloc_lock
);
948 ext4_es_init_tree(&ei
->i_es_tree
);
949 rwlock_init(&ei
->i_es_lock
);
950 INIT_LIST_HEAD(&ei
->i_es_list
);
953 ei
->i_es_shrink_lblk
= 0;
954 ei
->i_reserved_data_blocks
= 0;
955 ei
->i_reserved_meta_blocks
= 0;
956 ei
->i_allocated_meta_blocks
= 0;
957 ei
->i_da_metadata_calc_len
= 0;
958 ei
->i_da_metadata_calc_last_lblock
= 0;
959 spin_lock_init(&(ei
->i_block_reservation_lock
));
961 ei
->i_reserved_quota
= 0;
962 memset(&ei
->i_dquot
, 0, sizeof(ei
->i_dquot
));
965 INIT_LIST_HEAD(&ei
->i_rsv_conversion_list
);
966 spin_lock_init(&ei
->i_completed_io_lock
);
968 ei
->i_datasync_tid
= 0;
969 atomic_set(&ei
->i_unwritten
, 0);
970 INIT_WORK(&ei
->i_rsv_conversion_work
, ext4_end_io_rsv_work
);
971 return &ei
->vfs_inode
;
974 static int ext4_drop_inode(struct inode
*inode
)
976 int drop
= generic_drop_inode(inode
);
978 trace_ext4_drop_inode(inode
, drop
);
982 static void ext4_i_callback(struct rcu_head
*head
)
984 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
985 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
988 static void ext4_destroy_inode(struct inode
*inode
)
990 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
991 ext4_msg(inode
->i_sb
, KERN_ERR
,
992 "Inode %lu (%p): orphan list check failed!",
993 inode
->i_ino
, EXT4_I(inode
));
994 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
995 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
999 call_rcu(&inode
->i_rcu
, ext4_i_callback
);
1002 static void init_once(void *foo
)
1004 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
1006 INIT_LIST_HEAD(&ei
->i_orphan
);
1007 init_rwsem(&ei
->xattr_sem
);
1008 init_rwsem(&ei
->i_data_sem
);
1009 init_rwsem(&ei
->i_mmap_sem
);
1010 inode_init_once(&ei
->vfs_inode
);
1013 static int __init
init_inodecache(void)
1015 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
1016 sizeof(struct ext4_inode_info
),
1017 0, (SLAB_RECLAIM_ACCOUNT
|
1018 SLAB_MEM_SPREAD
|SLAB_ACCOUNT
),
1020 if (ext4_inode_cachep
== NULL
)
1025 static void destroy_inodecache(void)
1028 * Make sure all delayed rcu free inodes are flushed before we
1032 kmem_cache_destroy(ext4_inode_cachep
);
1035 void ext4_clear_inode(struct inode
*inode
)
1037 invalidate_inode_buffers(inode
);
1040 ext4_discard_preallocations(inode
);
1041 ext4_es_remove_extent(inode
, 0, EXT_MAX_BLOCKS
);
1042 if (EXT4_I(inode
)->jinode
) {
1043 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode
),
1044 EXT4_I(inode
)->jinode
);
1045 jbd2_free_inode(EXT4_I(inode
)->jinode
);
1046 EXT4_I(inode
)->jinode
= NULL
;
1048 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1049 fscrypt_put_encryption_info(inode
, NULL
);
1053 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
1054 u64 ino
, u32 generation
)
1056 struct inode
*inode
;
1058 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
1059 return ERR_PTR(-ESTALE
);
1060 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
1061 return ERR_PTR(-ESTALE
);
1063 /* iget isn't really right if the inode is currently unallocated!!
1065 * ext4_read_inode will return a bad_inode if the inode had been
1066 * deleted, so we should be safe.
1068 * Currently we don't know the generation for parent directory, so
1069 * a generation of 0 means "accept any"
1071 inode
= ext4_iget_normal(sb
, ino
);
1073 return ERR_CAST(inode
);
1074 if (generation
&& inode
->i_generation
!= generation
) {
1076 return ERR_PTR(-ESTALE
);
1082 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
1083 int fh_len
, int fh_type
)
1085 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
1086 ext4_nfs_get_inode
);
1089 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
1090 int fh_len
, int fh_type
)
1092 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
1093 ext4_nfs_get_inode
);
1097 * Try to release metadata pages (indirect blocks, directories) which are
1098 * mapped via the block device. Since these pages could have journal heads
1099 * which would prevent try_to_free_buffers() from freeing them, we must use
1100 * jbd2 layer's try_to_free_buffers() function to release them.
1102 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
1105 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
1107 WARN_ON(PageChecked(page
));
1108 if (!page_has_buffers(page
))
1111 return jbd2_journal_try_to_free_buffers(journal
, page
,
1112 wait
& ~__GFP_DIRECT_RECLAIM
);
1113 return try_to_free_buffers(page
);
1116 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1117 static int ext4_get_context(struct inode
*inode
, void *ctx
, size_t len
)
1119 return ext4_xattr_get(inode
, EXT4_XATTR_INDEX_ENCRYPTION
,
1120 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT
, ctx
, len
);
1123 static int ext4_prepare_context(struct inode
*inode
)
1125 return ext4_convert_inline_data(inode
);
1128 static int ext4_set_context(struct inode
*inode
, const void *ctx
, size_t len
,
1131 handle_t
*handle
= fs_data
;
1132 int res
, res2
, retries
= 0;
1135 * If a journal handle was specified, then the encryption context is
1136 * being set on a new inode via inheritance and is part of a larger
1137 * transaction to create the inode. Otherwise the encryption context is
1138 * being set on an existing inode in its own transaction. Only in the
1139 * latter case should the "retry on ENOSPC" logic be used.
1143 res
= ext4_xattr_set_handle(handle
, inode
,
1144 EXT4_XATTR_INDEX_ENCRYPTION
,
1145 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT
,
1148 ext4_set_inode_flag(inode
, EXT4_INODE_ENCRYPT
);
1149 ext4_clear_inode_state(inode
,
1150 EXT4_STATE_MAY_INLINE_DATA
);
1152 * Update inode->i_flags - e.g. S_DAX may get disabled
1154 ext4_set_inode_flags(inode
);
1160 handle
= ext4_journal_start(inode
, EXT4_HT_MISC
,
1161 ext4_jbd2_credits_xattr(inode
));
1163 return PTR_ERR(handle
);
1165 res
= ext4_xattr_set_handle(handle
, inode
, EXT4_XATTR_INDEX_ENCRYPTION
,
1166 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT
,
1169 ext4_set_inode_flag(inode
, EXT4_INODE_ENCRYPT
);
1170 /* Update inode->i_flags - e.g. S_DAX may get disabled */
1171 ext4_set_inode_flags(inode
);
1172 res
= ext4_mark_inode_dirty(handle
, inode
);
1174 EXT4_ERROR_INODE(inode
, "Failed to mark inode dirty");
1176 res2
= ext4_journal_stop(handle
);
1178 if (res
== -ENOSPC
&& ext4_should_retry_alloc(inode
->i_sb
, &retries
))
1185 static int ext4_dummy_context(struct inode
*inode
)
1187 return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode
->i_sb
));
1190 static unsigned ext4_max_namelen(struct inode
*inode
)
1192 return S_ISLNK(inode
->i_mode
) ? inode
->i_sb
->s_blocksize
:
1196 static const struct fscrypt_operations ext4_cryptops
= {
1197 .key_prefix
= "ext4:",
1198 .get_context
= ext4_get_context
,
1199 .prepare_context
= ext4_prepare_context
,
1200 .set_context
= ext4_set_context
,
1201 .dummy_context
= ext4_dummy_context
,
1202 .is_encrypted
= ext4_encrypted_inode
,
1203 .empty_dir
= ext4_empty_dir
,
1204 .max_namelen
= ext4_max_namelen
,
1207 static const struct fscrypt_operations ext4_cryptops
= {
1208 .is_encrypted
= ext4_encrypted_inode
,
1213 static char *quotatypes
[] = INITQFNAMES
;
1214 #define QTYPE2NAME(t) (quotatypes[t])
1216 static int ext4_write_dquot(struct dquot
*dquot
);
1217 static int ext4_acquire_dquot(struct dquot
*dquot
);
1218 static int ext4_release_dquot(struct dquot
*dquot
);
1219 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1220 static int ext4_write_info(struct super_block
*sb
, int type
);
1221 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1222 const struct path
*path
);
1223 static int ext4_quota_off(struct super_block
*sb
, int type
);
1224 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1225 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1226 size_t len
, loff_t off
);
1227 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1228 const char *data
, size_t len
, loff_t off
);
1229 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
1230 unsigned int flags
);
1231 static int ext4_enable_quotas(struct super_block
*sb
);
1232 static int ext4_get_next_id(struct super_block
*sb
, struct kqid
*qid
);
1234 static struct dquot
**ext4_get_dquots(struct inode
*inode
)
1236 return EXT4_I(inode
)->i_dquot
;
1239 static const struct dquot_operations ext4_quota_operations
= {
1240 .get_reserved_space
= ext4_get_reserved_space
,
1241 .write_dquot
= ext4_write_dquot
,
1242 .acquire_dquot
= ext4_acquire_dquot
,
1243 .release_dquot
= ext4_release_dquot
,
1244 .mark_dirty
= ext4_mark_dquot_dirty
,
1245 .write_info
= ext4_write_info
,
1246 .alloc_dquot
= dquot_alloc
,
1247 .destroy_dquot
= dquot_destroy
,
1248 .get_projid
= ext4_get_projid
,
1249 .get_next_id
= ext4_get_next_id
,
1252 static const struct quotactl_ops ext4_qctl_operations
= {
1253 .quota_on
= ext4_quota_on
,
1254 .quota_off
= ext4_quota_off
,
1255 .quota_sync
= dquot_quota_sync
,
1256 .get_state
= dquot_get_state
,
1257 .set_info
= dquot_set_dqinfo
,
1258 .get_dqblk
= dquot_get_dqblk
,
1259 .set_dqblk
= dquot_set_dqblk
,
1260 .get_nextdqblk
= dquot_get_next_dqblk
,
1264 static const struct super_operations ext4_sops
= {
1265 .alloc_inode
= ext4_alloc_inode
,
1266 .destroy_inode
= ext4_destroy_inode
,
1267 .write_inode
= ext4_write_inode
,
1268 .dirty_inode
= ext4_dirty_inode
,
1269 .drop_inode
= ext4_drop_inode
,
1270 .evict_inode
= ext4_evict_inode
,
1271 .put_super
= ext4_put_super
,
1272 .sync_fs
= ext4_sync_fs
,
1273 .freeze_fs
= ext4_freeze
,
1274 .unfreeze_fs
= ext4_unfreeze
,
1275 .statfs
= ext4_statfs
,
1276 .remount_fs
= ext4_remount
,
1277 .show_options
= ext4_show_options
,
1279 .quota_read
= ext4_quota_read
,
1280 .quota_write
= ext4_quota_write
,
1281 .get_dquots
= ext4_get_dquots
,
1283 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1286 static const struct export_operations ext4_export_ops
= {
1287 .fh_to_dentry
= ext4_fh_to_dentry
,
1288 .fh_to_parent
= ext4_fh_to_parent
,
1289 .get_parent
= ext4_get_parent
,
1293 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1294 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1295 Opt_nouid32
, Opt_debug
, Opt_removed
,
1296 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1297 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
,
1298 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
, Opt_journal_dev
,
1299 Opt_journal_path
, Opt_journal_checksum
, Opt_journal_async_commit
,
1300 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1301 Opt_data_err_abort
, Opt_data_err_ignore
, Opt_test_dummy_encryption
,
1302 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1303 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1304 Opt_noquota
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1305 Opt_usrquota
, Opt_grpquota
, Opt_prjquota
, Opt_i_version
, Opt_dax
,
1306 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
, Opt_mblk_io_submit
,
1307 Opt_lazytime
, Opt_nolazytime
, Opt_debug_want_extra_isize
,
1308 Opt_nomblk_io_submit
, Opt_block_validity
, Opt_noblock_validity
,
1309 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1310 Opt_dioread_nolock
, Opt_dioread_lock
,
1311 Opt_discard
, Opt_nodiscard
, Opt_init_itable
, Opt_noinit_itable
,
1312 Opt_max_dir_size_kb
, Opt_nojournal_checksum
,
1315 static const match_table_t tokens
= {
1316 {Opt_bsd_df
, "bsddf"},
1317 {Opt_minix_df
, "minixdf"},
1318 {Opt_grpid
, "grpid"},
1319 {Opt_grpid
, "bsdgroups"},
1320 {Opt_nogrpid
, "nogrpid"},
1321 {Opt_nogrpid
, "sysvgroups"},
1322 {Opt_resgid
, "resgid=%u"},
1323 {Opt_resuid
, "resuid=%u"},
1325 {Opt_err_cont
, "errors=continue"},
1326 {Opt_err_panic
, "errors=panic"},
1327 {Opt_err_ro
, "errors=remount-ro"},
1328 {Opt_nouid32
, "nouid32"},
1329 {Opt_debug
, "debug"},
1330 {Opt_removed
, "oldalloc"},
1331 {Opt_removed
, "orlov"},
1332 {Opt_user_xattr
, "user_xattr"},
1333 {Opt_nouser_xattr
, "nouser_xattr"},
1335 {Opt_noacl
, "noacl"},
1336 {Opt_noload
, "norecovery"},
1337 {Opt_noload
, "noload"},
1338 {Opt_removed
, "nobh"},
1339 {Opt_removed
, "bh"},
1340 {Opt_commit
, "commit=%u"},
1341 {Opt_min_batch_time
, "min_batch_time=%u"},
1342 {Opt_max_batch_time
, "max_batch_time=%u"},
1343 {Opt_journal_dev
, "journal_dev=%u"},
1344 {Opt_journal_path
, "journal_path=%s"},
1345 {Opt_journal_checksum
, "journal_checksum"},
1346 {Opt_nojournal_checksum
, "nojournal_checksum"},
1347 {Opt_journal_async_commit
, "journal_async_commit"},
1348 {Opt_abort
, "abort"},
1349 {Opt_data_journal
, "data=journal"},
1350 {Opt_data_ordered
, "data=ordered"},
1351 {Opt_data_writeback
, "data=writeback"},
1352 {Opt_data_err_abort
, "data_err=abort"},
1353 {Opt_data_err_ignore
, "data_err=ignore"},
1354 {Opt_offusrjquota
, "usrjquota="},
1355 {Opt_usrjquota
, "usrjquota=%s"},
1356 {Opt_offgrpjquota
, "grpjquota="},
1357 {Opt_grpjquota
, "grpjquota=%s"},
1358 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1359 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1360 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1361 {Opt_grpquota
, "grpquota"},
1362 {Opt_noquota
, "noquota"},
1363 {Opt_quota
, "quota"},
1364 {Opt_usrquota
, "usrquota"},
1365 {Opt_prjquota
, "prjquota"},
1366 {Opt_barrier
, "barrier=%u"},
1367 {Opt_barrier
, "barrier"},
1368 {Opt_nobarrier
, "nobarrier"},
1369 {Opt_i_version
, "i_version"},
1371 {Opt_stripe
, "stripe=%u"},
1372 {Opt_delalloc
, "delalloc"},
1373 {Opt_lazytime
, "lazytime"},
1374 {Opt_nolazytime
, "nolazytime"},
1375 {Opt_debug_want_extra_isize
, "debug_want_extra_isize=%u"},
1376 {Opt_nodelalloc
, "nodelalloc"},
1377 {Opt_removed
, "mblk_io_submit"},
1378 {Opt_removed
, "nomblk_io_submit"},
1379 {Opt_block_validity
, "block_validity"},
1380 {Opt_noblock_validity
, "noblock_validity"},
1381 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1382 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1383 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1384 {Opt_auto_da_alloc
, "auto_da_alloc"},
1385 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1386 {Opt_dioread_nolock
, "dioread_nolock"},
1387 {Opt_dioread_lock
, "dioread_lock"},
1388 {Opt_discard
, "discard"},
1389 {Opt_nodiscard
, "nodiscard"},
1390 {Opt_init_itable
, "init_itable=%u"},
1391 {Opt_init_itable
, "init_itable"},
1392 {Opt_noinit_itable
, "noinit_itable"},
1393 {Opt_max_dir_size_kb
, "max_dir_size_kb=%u"},
1394 {Opt_test_dummy_encryption
, "test_dummy_encryption"},
1395 {Opt_removed
, "check=none"}, /* mount option from ext2/3 */
1396 {Opt_removed
, "nocheck"}, /* mount option from ext2/3 */
1397 {Opt_removed
, "reservation"}, /* mount option from ext2/3 */
1398 {Opt_removed
, "noreservation"}, /* mount option from ext2/3 */
1399 {Opt_removed
, "journal=%u"}, /* mount option from ext2/3 */
1403 static ext4_fsblk_t
get_sb_block(void **data
)
1405 ext4_fsblk_t sb_block
;
1406 char *options
= (char *) *data
;
1408 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1409 return 1; /* Default location */
1412 /* TODO: use simple_strtoll with >32bit ext4 */
1413 sb_block
= simple_strtoul(options
, &options
, 0);
1414 if (*options
&& *options
!= ',') {
1415 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1419 if (*options
== ',')
1421 *data
= (void *) options
;
1426 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1427 static char deprecated_msg
[] = "Mount option \"%s\" will be removed by %s\n"
1428 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1431 static int set_qf_name(struct super_block
*sb
, int qtype
, substring_t
*args
)
1433 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1437 if (sb_any_quota_loaded(sb
) &&
1438 !sbi
->s_qf_names
[qtype
]) {
1439 ext4_msg(sb
, KERN_ERR
,
1440 "Cannot change journaled "
1441 "quota options when quota turned on");
1444 if (ext4_has_feature_quota(sb
)) {
1445 ext4_msg(sb
, KERN_INFO
, "Journaled quota options "
1446 "ignored when QUOTA feature is enabled");
1449 qname
= match_strdup(args
);
1451 ext4_msg(sb
, KERN_ERR
,
1452 "Not enough memory for storing quotafile name");
1455 if (sbi
->s_qf_names
[qtype
]) {
1456 if (strcmp(sbi
->s_qf_names
[qtype
], qname
) == 0)
1459 ext4_msg(sb
, KERN_ERR
,
1460 "%s quota file already specified",
1464 if (strchr(qname
, '/')) {
1465 ext4_msg(sb
, KERN_ERR
,
1466 "quotafile must be on filesystem root");
1469 sbi
->s_qf_names
[qtype
] = qname
;
1477 static int clear_qf_name(struct super_block
*sb
, int qtype
)
1480 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1482 if (sb_any_quota_loaded(sb
) &&
1483 sbi
->s_qf_names
[qtype
]) {
1484 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled quota options"
1485 " when quota turned on");
1488 kfree(sbi
->s_qf_names
[qtype
]);
1489 sbi
->s_qf_names
[qtype
] = NULL
;
1494 #define MOPT_SET 0x0001
1495 #define MOPT_CLEAR 0x0002
1496 #define MOPT_NOSUPPORT 0x0004
1497 #define MOPT_EXPLICIT 0x0008
1498 #define MOPT_CLEAR_ERR 0x0010
1499 #define MOPT_GTE0 0x0020
1502 #define MOPT_QFMT 0x0040
1504 #define MOPT_Q MOPT_NOSUPPORT
1505 #define MOPT_QFMT MOPT_NOSUPPORT
1507 #define MOPT_DATAJ 0x0080
1508 #define MOPT_NO_EXT2 0x0100
1509 #define MOPT_NO_EXT3 0x0200
1510 #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1511 #define MOPT_STRING 0x0400
1513 static const struct mount_opts
{
1517 } ext4_mount_opts
[] = {
1518 {Opt_minix_df
, EXT4_MOUNT_MINIX_DF
, MOPT_SET
},
1519 {Opt_bsd_df
, EXT4_MOUNT_MINIX_DF
, MOPT_CLEAR
},
1520 {Opt_grpid
, EXT4_MOUNT_GRPID
, MOPT_SET
},
1521 {Opt_nogrpid
, EXT4_MOUNT_GRPID
, MOPT_CLEAR
},
1522 {Opt_block_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_SET
},
1523 {Opt_noblock_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_CLEAR
},
1524 {Opt_dioread_nolock
, EXT4_MOUNT_DIOREAD_NOLOCK
,
1525 MOPT_EXT4_ONLY
| MOPT_SET
},
1526 {Opt_dioread_lock
, EXT4_MOUNT_DIOREAD_NOLOCK
,
1527 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1528 {Opt_discard
, EXT4_MOUNT_DISCARD
, MOPT_SET
},
1529 {Opt_nodiscard
, EXT4_MOUNT_DISCARD
, MOPT_CLEAR
},
1530 {Opt_delalloc
, EXT4_MOUNT_DELALLOC
,
1531 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1532 {Opt_nodelalloc
, EXT4_MOUNT_DELALLOC
,
1533 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1534 {Opt_nojournal_checksum
, EXT4_MOUNT_JOURNAL_CHECKSUM
,
1535 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1536 {Opt_journal_checksum
, EXT4_MOUNT_JOURNAL_CHECKSUM
,
1537 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1538 {Opt_journal_async_commit
, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT
|
1539 EXT4_MOUNT_JOURNAL_CHECKSUM
),
1540 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1541 {Opt_noload
, EXT4_MOUNT_NOLOAD
, MOPT_NO_EXT2
| MOPT_SET
},
1542 {Opt_err_panic
, EXT4_MOUNT_ERRORS_PANIC
, MOPT_SET
| MOPT_CLEAR_ERR
},
1543 {Opt_err_ro
, EXT4_MOUNT_ERRORS_RO
, MOPT_SET
| MOPT_CLEAR_ERR
},
1544 {Opt_err_cont
, EXT4_MOUNT_ERRORS_CONT
, MOPT_SET
| MOPT_CLEAR_ERR
},
1545 {Opt_data_err_abort
, EXT4_MOUNT_DATA_ERR_ABORT
,
1547 {Opt_data_err_ignore
, EXT4_MOUNT_DATA_ERR_ABORT
,
1549 {Opt_barrier
, EXT4_MOUNT_BARRIER
, MOPT_SET
},
1550 {Opt_nobarrier
, EXT4_MOUNT_BARRIER
, MOPT_CLEAR
},
1551 {Opt_noauto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_SET
},
1552 {Opt_auto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_CLEAR
},
1553 {Opt_noinit_itable
, EXT4_MOUNT_INIT_INODE_TABLE
, MOPT_CLEAR
},
1554 {Opt_commit
, 0, MOPT_GTE0
},
1555 {Opt_max_batch_time
, 0, MOPT_GTE0
},
1556 {Opt_min_batch_time
, 0, MOPT_GTE0
},
1557 {Opt_inode_readahead_blks
, 0, MOPT_GTE0
},
1558 {Opt_init_itable
, 0, MOPT_GTE0
},
1559 {Opt_dax
, EXT4_MOUNT_DAX
, MOPT_SET
},
1560 {Opt_stripe
, 0, MOPT_GTE0
},
1561 {Opt_resuid
, 0, MOPT_GTE0
},
1562 {Opt_resgid
, 0, MOPT_GTE0
},
1563 {Opt_journal_dev
, 0, MOPT_NO_EXT2
| MOPT_GTE0
},
1564 {Opt_journal_path
, 0, MOPT_NO_EXT2
| MOPT_STRING
},
1565 {Opt_journal_ioprio
, 0, MOPT_NO_EXT2
| MOPT_GTE0
},
1566 {Opt_data_journal
, EXT4_MOUNT_JOURNAL_DATA
, MOPT_NO_EXT2
| MOPT_DATAJ
},
1567 {Opt_data_ordered
, EXT4_MOUNT_ORDERED_DATA
, MOPT_NO_EXT2
| MOPT_DATAJ
},
1568 {Opt_data_writeback
, EXT4_MOUNT_WRITEBACK_DATA
,
1569 MOPT_NO_EXT2
| MOPT_DATAJ
},
1570 {Opt_user_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_SET
},
1571 {Opt_nouser_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_CLEAR
},
1572 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1573 {Opt_acl
, EXT4_MOUNT_POSIX_ACL
, MOPT_SET
},
1574 {Opt_noacl
, EXT4_MOUNT_POSIX_ACL
, MOPT_CLEAR
},
1576 {Opt_acl
, 0, MOPT_NOSUPPORT
},
1577 {Opt_noacl
, 0, MOPT_NOSUPPORT
},
1579 {Opt_nouid32
, EXT4_MOUNT_NO_UID32
, MOPT_SET
},
1580 {Opt_debug
, EXT4_MOUNT_DEBUG
, MOPT_SET
},
1581 {Opt_debug_want_extra_isize
, 0, MOPT_GTE0
},
1582 {Opt_quota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
, MOPT_SET
| MOPT_Q
},
1583 {Opt_usrquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
,
1585 {Opt_grpquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_GRPQUOTA
,
1587 {Opt_prjquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_PRJQUOTA
,
1589 {Opt_noquota
, (EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
|
1590 EXT4_MOUNT_GRPQUOTA
| EXT4_MOUNT_PRJQUOTA
),
1591 MOPT_CLEAR
| MOPT_Q
},
1592 {Opt_usrjquota
, 0, MOPT_Q
},
1593 {Opt_grpjquota
, 0, MOPT_Q
},
1594 {Opt_offusrjquota
, 0, MOPT_Q
},
1595 {Opt_offgrpjquota
, 0, MOPT_Q
},
1596 {Opt_jqfmt_vfsold
, QFMT_VFS_OLD
, MOPT_QFMT
},
1597 {Opt_jqfmt_vfsv0
, QFMT_VFS_V0
, MOPT_QFMT
},
1598 {Opt_jqfmt_vfsv1
, QFMT_VFS_V1
, MOPT_QFMT
},
1599 {Opt_max_dir_size_kb
, 0, MOPT_GTE0
},
1600 {Opt_test_dummy_encryption
, 0, MOPT_GTE0
},
1604 static int handle_mount_opt(struct super_block
*sb
, char *opt
, int token
,
1605 substring_t
*args
, unsigned long *journal_devnum
,
1606 unsigned int *journal_ioprio
, int is_remount
)
1608 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1609 const struct mount_opts
*m
;
1615 if (token
== Opt_usrjquota
)
1616 return set_qf_name(sb
, USRQUOTA
, &args
[0]);
1617 else if (token
== Opt_grpjquota
)
1618 return set_qf_name(sb
, GRPQUOTA
, &args
[0]);
1619 else if (token
== Opt_offusrjquota
)
1620 return clear_qf_name(sb
, USRQUOTA
);
1621 else if (token
== Opt_offgrpjquota
)
1622 return clear_qf_name(sb
, GRPQUOTA
);
1626 case Opt_nouser_xattr
:
1627 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, opt
, "3.5");
1630 return 1; /* handled by get_sb_block() */
1632 ext4_msg(sb
, KERN_WARNING
, "Ignoring removed %s option", opt
);
1635 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1638 sb
->s_flags
|= MS_I_VERSION
;
1641 sb
->s_flags
|= MS_LAZYTIME
;
1643 case Opt_nolazytime
:
1644 sb
->s_flags
&= ~MS_LAZYTIME
;
1648 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++)
1649 if (token
== m
->token
)
1652 if (m
->token
== Opt_err
) {
1653 ext4_msg(sb
, KERN_ERR
, "Unrecognized mount option \"%s\" "
1654 "or missing value", opt
);
1658 if ((m
->flags
& MOPT_NO_EXT2
) && IS_EXT2_SB(sb
)) {
1659 ext4_msg(sb
, KERN_ERR
,
1660 "Mount option \"%s\" incompatible with ext2", opt
);
1663 if ((m
->flags
& MOPT_NO_EXT3
) && IS_EXT3_SB(sb
)) {
1664 ext4_msg(sb
, KERN_ERR
,
1665 "Mount option \"%s\" incompatible with ext3", opt
);
1669 if (args
->from
&& !(m
->flags
& MOPT_STRING
) && match_int(args
, &arg
))
1671 if (args
->from
&& (m
->flags
& MOPT_GTE0
) && (arg
< 0))
1673 if (m
->flags
& MOPT_EXPLICIT
) {
1674 if (m
->mount_opt
& EXT4_MOUNT_DELALLOC
) {
1675 set_opt2(sb
, EXPLICIT_DELALLOC
);
1676 } else if (m
->mount_opt
& EXT4_MOUNT_JOURNAL_CHECKSUM
) {
1677 set_opt2(sb
, EXPLICIT_JOURNAL_CHECKSUM
);
1681 if (m
->flags
& MOPT_CLEAR_ERR
)
1682 clear_opt(sb
, ERRORS_MASK
);
1683 if (token
== Opt_noquota
&& sb_any_quota_loaded(sb
)) {
1684 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1685 "options when quota turned on");
1689 if (m
->flags
& MOPT_NOSUPPORT
) {
1690 ext4_msg(sb
, KERN_ERR
, "%s option not supported", opt
);
1691 } else if (token
== Opt_commit
) {
1693 arg
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1694 sbi
->s_commit_interval
= HZ
* arg
;
1695 } else if (token
== Opt_debug_want_extra_isize
) {
1696 sbi
->s_want_extra_isize
= arg
;
1697 } else if (token
== Opt_max_batch_time
) {
1698 sbi
->s_max_batch_time
= arg
;
1699 } else if (token
== Opt_min_batch_time
) {
1700 sbi
->s_min_batch_time
= arg
;
1701 } else if (token
== Opt_inode_readahead_blks
) {
1702 if (arg
&& (arg
> (1 << 30) || !is_power_of_2(arg
))) {
1703 ext4_msg(sb
, KERN_ERR
,
1704 "EXT4-fs: inode_readahead_blks must be "
1705 "0 or a power of 2 smaller than 2^31");
1708 sbi
->s_inode_readahead_blks
= arg
;
1709 } else if (token
== Opt_init_itable
) {
1710 set_opt(sb
, INIT_INODE_TABLE
);
1712 arg
= EXT4_DEF_LI_WAIT_MULT
;
1713 sbi
->s_li_wait_mult
= arg
;
1714 } else if (token
== Opt_max_dir_size_kb
) {
1715 sbi
->s_max_dir_size_kb
= arg
;
1716 } else if (token
== Opt_stripe
) {
1717 sbi
->s_stripe
= arg
;
1718 } else if (token
== Opt_resuid
) {
1719 uid
= make_kuid(current_user_ns(), arg
);
1720 if (!uid_valid(uid
)) {
1721 ext4_msg(sb
, KERN_ERR
, "Invalid uid value %d", arg
);
1724 sbi
->s_resuid
= uid
;
1725 } else if (token
== Opt_resgid
) {
1726 gid
= make_kgid(current_user_ns(), arg
);
1727 if (!gid_valid(gid
)) {
1728 ext4_msg(sb
, KERN_ERR
, "Invalid gid value %d", arg
);
1731 sbi
->s_resgid
= gid
;
1732 } else if (token
== Opt_journal_dev
) {
1734 ext4_msg(sb
, KERN_ERR
,
1735 "Cannot specify journal on remount");
1738 *journal_devnum
= arg
;
1739 } else if (token
== Opt_journal_path
) {
1741 struct inode
*journal_inode
;
1746 ext4_msg(sb
, KERN_ERR
,
1747 "Cannot specify journal on remount");
1750 journal_path
= match_strdup(&args
[0]);
1751 if (!journal_path
) {
1752 ext4_msg(sb
, KERN_ERR
, "error: could not dup "
1753 "journal device string");
1757 error
= kern_path(journal_path
, LOOKUP_FOLLOW
, &path
);
1759 ext4_msg(sb
, KERN_ERR
, "error: could not find "
1760 "journal device path: error %d", error
);
1761 kfree(journal_path
);
1765 journal_inode
= d_inode(path
.dentry
);
1766 if (!S_ISBLK(journal_inode
->i_mode
)) {
1767 ext4_msg(sb
, KERN_ERR
, "error: journal path %s "
1768 "is not a block device", journal_path
);
1770 kfree(journal_path
);
1774 *journal_devnum
= new_encode_dev(journal_inode
->i_rdev
);
1776 kfree(journal_path
);
1777 } else if (token
== Opt_journal_ioprio
) {
1779 ext4_msg(sb
, KERN_ERR
, "Invalid journal IO priority"
1784 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
, arg
);
1785 } else if (token
== Opt_test_dummy_encryption
) {
1786 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1787 sbi
->s_mount_flags
|= EXT4_MF_TEST_DUMMY_ENCRYPTION
;
1788 ext4_msg(sb
, KERN_WARNING
,
1789 "Test dummy encryption mode enabled");
1791 ext4_msg(sb
, KERN_WARNING
,
1792 "Test dummy encryption mount option ignored");
1794 } else if (m
->flags
& MOPT_DATAJ
) {
1796 if (!sbi
->s_journal
)
1797 ext4_msg(sb
, KERN_WARNING
, "Remounting file system with no journal so ignoring journalled data option");
1798 else if (test_opt(sb
, DATA_FLAGS
) != m
->mount_opt
) {
1799 ext4_msg(sb
, KERN_ERR
,
1800 "Cannot change data mode on remount");
1804 clear_opt(sb
, DATA_FLAGS
);
1805 sbi
->s_mount_opt
|= m
->mount_opt
;
1808 } else if (m
->flags
& MOPT_QFMT
) {
1809 if (sb_any_quota_loaded(sb
) &&
1810 sbi
->s_jquota_fmt
!= m
->mount_opt
) {
1811 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled "
1812 "quota options when quota turned on");
1815 if (ext4_has_feature_quota(sb
)) {
1816 ext4_msg(sb
, KERN_INFO
,
1817 "Quota format mount options ignored "
1818 "when QUOTA feature is enabled");
1821 sbi
->s_jquota_fmt
= m
->mount_opt
;
1823 } else if (token
== Opt_dax
) {
1824 #ifdef CONFIG_FS_DAX
1825 ext4_msg(sb
, KERN_WARNING
,
1826 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1827 sbi
->s_mount_opt
|= m
->mount_opt
;
1829 ext4_msg(sb
, KERN_INFO
, "dax option not supported");
1832 } else if (token
== Opt_data_err_abort
) {
1833 sbi
->s_mount_opt
|= m
->mount_opt
;
1834 } else if (token
== Opt_data_err_ignore
) {
1835 sbi
->s_mount_opt
&= ~m
->mount_opt
;
1839 if (m
->flags
& MOPT_CLEAR
)
1841 else if (unlikely(!(m
->flags
& MOPT_SET
))) {
1842 ext4_msg(sb
, KERN_WARNING
,
1843 "buggy handling of option %s", opt
);
1848 sbi
->s_mount_opt
|= m
->mount_opt
;
1850 sbi
->s_mount_opt
&= ~m
->mount_opt
;
1855 static int parse_options(char *options
, struct super_block
*sb
,
1856 unsigned long *journal_devnum
,
1857 unsigned int *journal_ioprio
,
1860 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1862 substring_t args
[MAX_OPT_ARGS
];
1868 while ((p
= strsep(&options
, ",")) != NULL
) {
1872 * Initialize args struct so we know whether arg was
1873 * found; some options take optional arguments.
1875 args
[0].to
= args
[0].from
= NULL
;
1876 token
= match_token(p
, tokens
, args
);
1877 if (handle_mount_opt(sb
, p
, token
, args
, journal_devnum
,
1878 journal_ioprio
, is_remount
) < 0)
1883 * We do the test below only for project quotas. 'usrquota' and
1884 * 'grpquota' mount options are allowed even without quota feature
1885 * to support legacy quotas in quota files.
1887 if (test_opt(sb
, PRJQUOTA
) && !ext4_has_feature_project(sb
)) {
1888 ext4_msg(sb
, KERN_ERR
, "Project quota feature not enabled. "
1889 "Cannot enable project quota enforcement.");
1892 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1893 if (test_opt(sb
, USRQUOTA
) && sbi
->s_qf_names
[USRQUOTA
])
1894 clear_opt(sb
, USRQUOTA
);
1896 if (test_opt(sb
, GRPQUOTA
) && sbi
->s_qf_names
[GRPQUOTA
])
1897 clear_opt(sb
, GRPQUOTA
);
1899 if (test_opt(sb
, GRPQUOTA
) || test_opt(sb
, USRQUOTA
)) {
1900 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1905 if (!sbi
->s_jquota_fmt
) {
1906 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1912 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
1914 BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
1916 if (blocksize
< PAGE_SIZE
) {
1917 ext4_msg(sb
, KERN_ERR
, "can't mount with "
1918 "dioread_nolock if block size != PAGE_SIZE");
1925 static inline void ext4_show_quota_options(struct seq_file
*seq
,
1926 struct super_block
*sb
)
1928 #if defined(CONFIG_QUOTA)
1929 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1931 if (sbi
->s_jquota_fmt
) {
1934 switch (sbi
->s_jquota_fmt
) {
1945 seq_printf(seq
, ",jqfmt=%s", fmtname
);
1948 if (sbi
->s_qf_names
[USRQUOTA
])
1949 seq_show_option(seq
, "usrjquota", sbi
->s_qf_names
[USRQUOTA
]);
1951 if (sbi
->s_qf_names
[GRPQUOTA
])
1952 seq_show_option(seq
, "grpjquota", sbi
->s_qf_names
[GRPQUOTA
]);
1956 static const char *token2str(int token
)
1958 const struct match_token
*t
;
1960 for (t
= tokens
; t
->token
!= Opt_err
; t
++)
1961 if (t
->token
== token
&& !strchr(t
->pattern
, '='))
1968 * - it's set to a non-default value OR
1969 * - if the per-sb default is different from the global default
1971 static int _ext4_show_options(struct seq_file
*seq
, struct super_block
*sb
,
1974 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1975 struct ext4_super_block
*es
= sbi
->s_es
;
1976 int def_errors
, def_mount_opt
= nodefs
? 0 : sbi
->s_def_mount_opt
;
1977 const struct mount_opts
*m
;
1978 char sep
= nodefs
? '\n' : ',';
1980 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1981 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1983 if (sbi
->s_sb_block
!= 1)
1984 SEQ_OPTS_PRINT("sb=%llu", sbi
->s_sb_block
);
1986 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++) {
1987 int want_set
= m
->flags
& MOPT_SET
;
1988 if (((m
->flags
& (MOPT_SET
|MOPT_CLEAR
)) == 0) ||
1989 (m
->flags
& MOPT_CLEAR_ERR
))
1991 if (!(m
->mount_opt
& (sbi
->s_mount_opt
^ def_mount_opt
)))
1992 continue; /* skip if same as the default */
1994 (sbi
->s_mount_opt
& m
->mount_opt
) != m
->mount_opt
) ||
1995 (!want_set
&& (sbi
->s_mount_opt
& m
->mount_opt
)))
1996 continue; /* select Opt_noFoo vs Opt_Foo */
1997 SEQ_OPTS_PRINT("%s", token2str(m
->token
));
2000 if (nodefs
|| !uid_eq(sbi
->s_resuid
, make_kuid(&init_user_ns
, EXT4_DEF_RESUID
)) ||
2001 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
)
2002 SEQ_OPTS_PRINT("resuid=%u",
2003 from_kuid_munged(&init_user_ns
, sbi
->s_resuid
));
2004 if (nodefs
|| !gid_eq(sbi
->s_resgid
, make_kgid(&init_user_ns
, EXT4_DEF_RESGID
)) ||
2005 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
)
2006 SEQ_OPTS_PRINT("resgid=%u",
2007 from_kgid_munged(&init_user_ns
, sbi
->s_resgid
));
2008 def_errors
= nodefs
? -1 : le16_to_cpu(es
->s_errors
);
2009 if (test_opt(sb
, ERRORS_RO
) && def_errors
!= EXT4_ERRORS_RO
)
2010 SEQ_OPTS_PUTS("errors=remount-ro");
2011 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
2012 SEQ_OPTS_PUTS("errors=continue");
2013 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
2014 SEQ_OPTS_PUTS("errors=panic");
2015 if (nodefs
|| sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
)
2016 SEQ_OPTS_PRINT("commit=%lu", sbi
->s_commit_interval
/ HZ
);
2017 if (nodefs
|| sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
)
2018 SEQ_OPTS_PRINT("min_batch_time=%u", sbi
->s_min_batch_time
);
2019 if (nodefs
|| sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
)
2020 SEQ_OPTS_PRINT("max_batch_time=%u", sbi
->s_max_batch_time
);
2021 if (sb
->s_flags
& MS_I_VERSION
)
2022 SEQ_OPTS_PUTS("i_version");
2023 if (nodefs
|| sbi
->s_stripe
)
2024 SEQ_OPTS_PRINT("stripe=%lu", sbi
->s_stripe
);
2025 if (EXT4_MOUNT_DATA_FLAGS
& (sbi
->s_mount_opt
^ def_mount_opt
)) {
2026 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
2027 SEQ_OPTS_PUTS("data=journal");
2028 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
2029 SEQ_OPTS_PUTS("data=ordered");
2030 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
2031 SEQ_OPTS_PUTS("data=writeback");
2034 sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
2035 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2036 sbi
->s_inode_readahead_blks
);
2038 if (nodefs
|| (test_opt(sb
, INIT_INODE_TABLE
) &&
2039 (sbi
->s_li_wait_mult
!= EXT4_DEF_LI_WAIT_MULT
)))
2040 SEQ_OPTS_PRINT("init_itable=%u", sbi
->s_li_wait_mult
);
2041 if (nodefs
|| sbi
->s_max_dir_size_kb
)
2042 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi
->s_max_dir_size_kb
);
2043 if (test_opt(sb
, DATA_ERR_ABORT
))
2044 SEQ_OPTS_PUTS("data_err=abort");
2046 ext4_show_quota_options(seq
, sb
);
2050 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
)
2052 return _ext4_show_options(seq
, root
->d_sb
, 0);
2055 int ext4_seq_options_show(struct seq_file
*seq
, void *offset
)
2057 struct super_block
*sb
= seq
->private;
2060 seq_puts(seq
, (sb
->s_flags
& MS_RDONLY
) ? "ro" : "rw");
2061 rc
= _ext4_show_options(seq
, sb
, 1);
2062 seq_puts(seq
, "\n");
2066 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
2069 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2072 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
2073 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
2074 "forcing read-only mode");
2079 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
2080 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
2081 "running e2fsck is recommended");
2082 else if (sbi
->s_mount_state
& EXT4_ERROR_FS
)
2083 ext4_msg(sb
, KERN_WARNING
,
2084 "warning: mounting fs with errors, "
2085 "running e2fsck is recommended");
2086 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) > 0 &&
2087 le16_to_cpu(es
->s_mnt_count
) >=
2088 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
2089 ext4_msg(sb
, KERN_WARNING
,
2090 "warning: maximal mount count reached, "
2091 "running e2fsck is recommended");
2092 else if (le32_to_cpu(es
->s_checkinterval
) &&
2093 (le32_to_cpu(es
->s_lastcheck
) +
2094 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
2095 ext4_msg(sb
, KERN_WARNING
,
2096 "warning: checktime reached, "
2097 "running e2fsck is recommended");
2098 if (!sbi
->s_journal
)
2099 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
2100 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
2101 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
2102 le16_add_cpu(&es
->s_mnt_count
, 1);
2103 es
->s_mtime
= cpu_to_le32(get_seconds());
2104 ext4_update_dynamic_rev(sb
);
2106 ext4_set_feature_journal_needs_recovery(sb
);
2108 ext4_commit_super(sb
, 1);
2110 if (test_opt(sb
, DEBUG
))
2111 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
2112 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
2114 sbi
->s_groups_count
,
2115 EXT4_BLOCKS_PER_GROUP(sb
),
2116 EXT4_INODES_PER_GROUP(sb
),
2117 sbi
->s_mount_opt
, sbi
->s_mount_opt2
);
2119 cleancache_init_fs(sb
);
2123 int ext4_alloc_flex_bg_array(struct super_block
*sb
, ext4_group_t ngroup
)
2125 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2126 struct flex_groups
*new_groups
;
2129 if (!sbi
->s_log_groups_per_flex
)
2132 size
= ext4_flex_group(sbi
, ngroup
- 1) + 1;
2133 if (size
<= sbi
->s_flex_groups_allocated
)
2136 size
= roundup_pow_of_two(size
* sizeof(struct flex_groups
));
2137 new_groups
= ext4_kvzalloc(size
, GFP_KERNEL
);
2139 ext4_msg(sb
, KERN_ERR
, "not enough memory for %d flex groups",
2140 size
/ (int) sizeof(struct flex_groups
));
2144 if (sbi
->s_flex_groups
) {
2145 memcpy(new_groups
, sbi
->s_flex_groups
,
2146 (sbi
->s_flex_groups_allocated
*
2147 sizeof(struct flex_groups
)));
2148 kvfree(sbi
->s_flex_groups
);
2150 sbi
->s_flex_groups
= new_groups
;
2151 sbi
->s_flex_groups_allocated
= size
/ sizeof(struct flex_groups
);
2155 static int ext4_fill_flex_info(struct super_block
*sb
)
2157 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2158 struct ext4_group_desc
*gdp
= NULL
;
2159 ext4_group_t flex_group
;
2162 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
2163 if (sbi
->s_log_groups_per_flex
< 1 || sbi
->s_log_groups_per_flex
> 31) {
2164 sbi
->s_log_groups_per_flex
= 0;
2168 err
= ext4_alloc_flex_bg_array(sb
, sbi
->s_groups_count
);
2172 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
2173 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2175 flex_group
= ext4_flex_group(sbi
, i
);
2176 atomic_add(ext4_free_inodes_count(sb
, gdp
),
2177 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
2178 atomic64_add(ext4_free_group_clusters(sb
, gdp
),
2179 &sbi
->s_flex_groups
[flex_group
].free_clusters
);
2180 atomic_add(ext4_used_dirs_count(sb
, gdp
),
2181 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
2189 static __le16
ext4_group_desc_csum(struct super_block
*sb
, __u32 block_group
,
2190 struct ext4_group_desc
*gdp
)
2192 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
2194 __le32 le_group
= cpu_to_le32(block_group
);
2195 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2197 if (ext4_has_metadata_csum(sbi
->s_sb
)) {
2198 /* Use new metadata_csum algorithm */
2200 __u16 dummy_csum
= 0;
2202 csum32
= ext4_chksum(sbi
, sbi
->s_csum_seed
, (__u8
*)&le_group
,
2204 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)gdp
, offset
);
2205 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)&dummy_csum
,
2206 sizeof(dummy_csum
));
2207 offset
+= sizeof(dummy_csum
);
2208 if (offset
< sbi
->s_desc_size
)
2209 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)gdp
+ offset
,
2210 sbi
->s_desc_size
- offset
);
2212 crc
= csum32
& 0xFFFF;
2216 /* old crc16 code */
2217 if (!ext4_has_feature_gdt_csum(sb
))
2220 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
2221 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
2222 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
2223 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
2224 /* for checksum of struct ext4_group_desc do the rest...*/
2225 if (ext4_has_feature_64bit(sb
) &&
2226 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
2227 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
2228 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
2232 return cpu_to_le16(crc
);
2235 int ext4_group_desc_csum_verify(struct super_block
*sb
, __u32 block_group
,
2236 struct ext4_group_desc
*gdp
)
2238 if (ext4_has_group_desc_csum(sb
) &&
2239 (gdp
->bg_checksum
!= ext4_group_desc_csum(sb
, block_group
, gdp
)))
2245 void ext4_group_desc_csum_set(struct super_block
*sb
, __u32 block_group
,
2246 struct ext4_group_desc
*gdp
)
2248 if (!ext4_has_group_desc_csum(sb
))
2250 gdp
->bg_checksum
= ext4_group_desc_csum(sb
, block_group
, gdp
);
2253 /* Called at mount-time, super-block is locked */
2254 static int ext4_check_descriptors(struct super_block
*sb
,
2255 ext4_fsblk_t sb_block
,
2256 ext4_group_t
*first_not_zeroed
)
2258 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2259 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
2260 ext4_fsblk_t last_block
;
2261 ext4_fsblk_t block_bitmap
;
2262 ext4_fsblk_t inode_bitmap
;
2263 ext4_fsblk_t inode_table
;
2264 int flexbg_flag
= 0;
2265 ext4_group_t i
, grp
= sbi
->s_groups_count
;
2267 if (ext4_has_feature_flex_bg(sb
))
2270 ext4_debug("Checking group descriptors");
2272 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
2273 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2275 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
2276 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
2278 last_block
= first_block
+
2279 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2281 if ((grp
== sbi
->s_groups_count
) &&
2282 !(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2285 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
2286 if (block_bitmap
== sb_block
) {
2287 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2288 "Block bitmap for group %u overlaps "
2291 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
2292 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2293 "Block bitmap for group %u not in group "
2294 "(block %llu)!", i
, block_bitmap
);
2297 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
2298 if (inode_bitmap
== sb_block
) {
2299 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2300 "Inode bitmap for group %u overlaps "
2303 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
2304 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2305 "Inode bitmap for group %u not in group "
2306 "(block %llu)!", i
, inode_bitmap
);
2309 inode_table
= ext4_inode_table(sb
, gdp
);
2310 if (inode_table
== sb_block
) {
2311 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2312 "Inode table for group %u overlaps "
2315 if (inode_table
< first_block
||
2316 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
2317 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2318 "Inode table for group %u not in group "
2319 "(block %llu)!", i
, inode_table
);
2322 ext4_lock_group(sb
, i
);
2323 if (!ext4_group_desc_csum_verify(sb
, i
, gdp
)) {
2324 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2325 "Checksum for group %u failed (%u!=%u)",
2326 i
, le16_to_cpu(ext4_group_desc_csum(sb
, i
,
2327 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
2328 if (!(sb
->s_flags
& MS_RDONLY
)) {
2329 ext4_unlock_group(sb
, i
);
2333 ext4_unlock_group(sb
, i
);
2335 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
2337 if (NULL
!= first_not_zeroed
)
2338 *first_not_zeroed
= grp
;
2342 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2343 * the superblock) which were deleted from all directories, but held open by
2344 * a process at the time of a crash. We walk the list and try to delete these
2345 * inodes at recovery time (only with a read-write filesystem).
2347 * In order to keep the orphan inode chain consistent during traversal (in
2348 * case of crash during recovery), we link each inode into the superblock
2349 * orphan list_head and handle it the same way as an inode deletion during
2350 * normal operation (which journals the operations for us).
2352 * We only do an iget() and an iput() on each inode, which is very safe if we
2353 * accidentally point at an in-use or already deleted inode. The worst that
2354 * can happen in this case is that we get a "bit already cleared" message from
2355 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2356 * e2fsck was run on this filesystem, and it must have already done the orphan
2357 * inode cleanup for us, so we can safely abort without any further action.
2359 static void ext4_orphan_cleanup(struct super_block
*sb
,
2360 struct ext4_super_block
*es
)
2362 unsigned int s_flags
= sb
->s_flags
;
2363 int ret
, nr_orphans
= 0, nr_truncates
= 0;
2367 if (!es
->s_last_orphan
) {
2368 jbd_debug(4, "no orphan inodes to clean up\n");
2372 if (bdev_read_only(sb
->s_bdev
)) {
2373 ext4_msg(sb
, KERN_ERR
, "write access "
2374 "unavailable, skipping orphan cleanup");
2378 /* Check if feature set would not allow a r/w mount */
2379 if (!ext4_feature_set_ok(sb
, 0)) {
2380 ext4_msg(sb
, KERN_INFO
, "Skipping orphan cleanup due to "
2381 "unknown ROCOMPAT features");
2385 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2386 /* don't clear list on RO mount w/ errors */
2387 if (es
->s_last_orphan
&& !(s_flags
& MS_RDONLY
)) {
2388 ext4_msg(sb
, KERN_INFO
, "Errors on filesystem, "
2389 "clearing orphan list.\n");
2390 es
->s_last_orphan
= 0;
2392 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2396 if (s_flags
& MS_RDONLY
) {
2397 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
2398 sb
->s_flags
&= ~MS_RDONLY
;
2401 /* Needed for iput() to work correctly and not trash data */
2402 sb
->s_flags
|= MS_ACTIVE
;
2403 /* Turn on quotas so that they are updated correctly */
2404 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++) {
2405 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
2406 int ret
= ext4_quota_on_mount(sb
, i
);
2408 ext4_msg(sb
, KERN_ERR
,
2409 "Cannot turn on journaled "
2410 "quota: error %d", ret
);
2415 while (es
->s_last_orphan
) {
2416 struct inode
*inode
;
2419 * We may have encountered an error during cleanup; if
2420 * so, skip the rest.
2422 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2423 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2424 es
->s_last_orphan
= 0;
2428 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
2429 if (IS_ERR(inode
)) {
2430 es
->s_last_orphan
= 0;
2434 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
2435 dquot_initialize(inode
);
2436 if (inode
->i_nlink
) {
2437 if (test_opt(sb
, DEBUG
))
2438 ext4_msg(sb
, KERN_DEBUG
,
2439 "%s: truncating inode %lu to %lld bytes",
2440 __func__
, inode
->i_ino
, inode
->i_size
);
2441 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2442 inode
->i_ino
, inode
->i_size
);
2444 truncate_inode_pages(inode
->i_mapping
, inode
->i_size
);
2445 ret
= ext4_truncate(inode
);
2447 ext4_std_error(inode
->i_sb
, ret
);
2448 inode_unlock(inode
);
2451 if (test_opt(sb
, DEBUG
))
2452 ext4_msg(sb
, KERN_DEBUG
,
2453 "%s: deleting unreferenced inode %lu",
2454 __func__
, inode
->i_ino
);
2455 jbd_debug(2, "deleting unreferenced inode %lu\n",
2459 iput(inode
); /* The delete magic happens here! */
2462 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2465 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
2466 PLURAL(nr_orphans
));
2468 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
2469 PLURAL(nr_truncates
));
2471 /* Turn quotas off */
2472 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++) {
2473 if (sb_dqopt(sb
)->files
[i
])
2474 dquot_quota_off(sb
, i
);
2477 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
2481 * Maximal extent format file size.
2482 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2483 * extent format containers, within a sector_t, and within i_blocks
2484 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2485 * so that won't be a limiting factor.
2487 * However there is other limiting factor. We do store extents in the form
2488 * of starting block and length, hence the resulting length of the extent
2489 * covering maximum file size must fit into on-disk format containers as
2490 * well. Given that length is always by 1 unit bigger than max unit (because
2491 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2493 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2495 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
2498 loff_t upper_limit
= MAX_LFS_FILESIZE
;
2500 /* small i_blocks in vfs inode? */
2501 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2503 * CONFIG_LBDAF is not enabled implies the inode
2504 * i_block represent total blocks in 512 bytes
2505 * 32 == size of vfs inode i_blocks * 8
2507 upper_limit
= (1LL << 32) - 1;
2509 /* total blocks in file system block size */
2510 upper_limit
>>= (blkbits
- 9);
2511 upper_limit
<<= blkbits
;
2515 * 32-bit extent-start container, ee_block. We lower the maxbytes
2516 * by one fs block, so ee_len can cover the extent of maximum file
2519 res
= (1LL << 32) - 1;
2522 /* Sanity check against vm- & vfs- imposed limits */
2523 if (res
> upper_limit
)
2530 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2531 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2532 * We need to be 1 filesystem block less than the 2^48 sector limit.
2534 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2536 loff_t res
= EXT4_NDIR_BLOCKS
;
2539 /* This is calculated to be the largest file size for a dense, block
2540 * mapped file such that the file's total number of 512-byte sectors,
2541 * including data and all indirect blocks, does not exceed (2^48 - 1).
2543 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2544 * number of 512-byte sectors of the file.
2547 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2549 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2550 * the inode i_block field represents total file blocks in
2551 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2553 upper_limit
= (1LL << 32) - 1;
2555 /* total blocks in file system block size */
2556 upper_limit
>>= (bits
- 9);
2560 * We use 48 bit ext4_inode i_blocks
2561 * With EXT4_HUGE_FILE_FL set the i_blocks
2562 * represent total number of blocks in
2563 * file system block size
2565 upper_limit
= (1LL << 48) - 1;
2569 /* indirect blocks */
2571 /* double indirect blocks */
2572 meta_blocks
+= 1 + (1LL << (bits
-2));
2573 /* tripple indirect blocks */
2574 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2576 upper_limit
-= meta_blocks
;
2577 upper_limit
<<= bits
;
2579 res
+= 1LL << (bits
-2);
2580 res
+= 1LL << (2*(bits
-2));
2581 res
+= 1LL << (3*(bits
-2));
2583 if (res
> upper_limit
)
2586 if (res
> MAX_LFS_FILESIZE
)
2587 res
= MAX_LFS_FILESIZE
;
2592 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2593 ext4_fsblk_t logical_sb_block
, int nr
)
2595 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2596 ext4_group_t bg
, first_meta_bg
;
2599 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2601 if (!ext4_has_feature_meta_bg(sb
) || nr
< first_meta_bg
)
2602 return logical_sb_block
+ nr
+ 1;
2603 bg
= sbi
->s_desc_per_block
* nr
;
2604 if (ext4_bg_has_super(sb
, bg
))
2608 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2609 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2610 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2613 if (sb
->s_blocksize
== 1024 && nr
== 0 &&
2614 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_first_data_block
) == 0)
2617 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2621 * ext4_get_stripe_size: Get the stripe size.
2622 * @sbi: In memory super block info
2624 * If we have specified it via mount option, then
2625 * use the mount option value. If the value specified at mount time is
2626 * greater than the blocks per group use the super block value.
2627 * If the super block value is greater than blocks per group return 0.
2628 * Allocator needs it be less than blocks per group.
2631 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2633 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2634 unsigned long stripe_width
=
2635 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2638 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2639 ret
= sbi
->s_stripe
;
2640 else if (stripe_width
&& stripe_width
<= sbi
->s_blocks_per_group
)
2642 else if (stride
&& stride
<= sbi
->s_blocks_per_group
)
2648 * If the stripe width is 1, this makes no sense and
2649 * we set it to 0 to turn off stripe handling code.
2658 * Check whether this filesystem can be mounted based on
2659 * the features present and the RDONLY/RDWR mount requested.
2660 * Returns 1 if this filesystem can be mounted as requested,
2661 * 0 if it cannot be.
2663 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2665 if (ext4_has_unknown_ext4_incompat_features(sb
)) {
2666 ext4_msg(sb
, KERN_ERR
,
2667 "Couldn't mount because of "
2668 "unsupported optional features (%x)",
2669 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2670 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2677 if (ext4_has_feature_readonly(sb
)) {
2678 ext4_msg(sb
, KERN_INFO
, "filesystem is read-only");
2679 sb
->s_flags
|= MS_RDONLY
;
2683 /* Check that feature set is OK for a read-write mount */
2684 if (ext4_has_unknown_ext4_ro_compat_features(sb
)) {
2685 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2686 "unsupported optional features (%x)",
2687 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2688 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2692 * Large file size enabled file system can only be mounted
2693 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2695 if (ext4_has_feature_huge_file(sb
)) {
2696 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2697 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2698 "cannot be mounted RDWR without "
2703 if (ext4_has_feature_bigalloc(sb
) && !ext4_has_feature_extents(sb
)) {
2704 ext4_msg(sb
, KERN_ERR
,
2705 "Can't support bigalloc feature without "
2706 "extents feature\n");
2710 #ifndef CONFIG_QUOTA
2711 if (ext4_has_feature_quota(sb
) && !readonly
) {
2712 ext4_msg(sb
, KERN_ERR
,
2713 "Filesystem with quota feature cannot be mounted RDWR "
2714 "without CONFIG_QUOTA");
2717 if (ext4_has_feature_project(sb
) && !readonly
) {
2718 ext4_msg(sb
, KERN_ERR
,
2719 "Filesystem with project quota feature cannot be mounted RDWR "
2720 "without CONFIG_QUOTA");
2723 #endif /* CONFIG_QUOTA */
2728 * This function is called once a day if we have errors logged
2729 * on the file system
2731 static void print_daily_error_info(unsigned long arg
)
2733 struct super_block
*sb
= (struct super_block
*) arg
;
2734 struct ext4_sb_info
*sbi
;
2735 struct ext4_super_block
*es
;
2740 if (es
->s_error_count
)
2741 /* fsck newer than v1.41.13 is needed to clean this condition. */
2742 ext4_msg(sb
, KERN_NOTICE
, "error count since last fsck: %u",
2743 le32_to_cpu(es
->s_error_count
));
2744 if (es
->s_first_error_time
) {
2745 printk(KERN_NOTICE
"EXT4-fs (%s): initial error at time %u: %.*s:%d",
2746 sb
->s_id
, le32_to_cpu(es
->s_first_error_time
),
2747 (int) sizeof(es
->s_first_error_func
),
2748 es
->s_first_error_func
,
2749 le32_to_cpu(es
->s_first_error_line
));
2750 if (es
->s_first_error_ino
)
2751 printk(KERN_CONT
": inode %u",
2752 le32_to_cpu(es
->s_first_error_ino
));
2753 if (es
->s_first_error_block
)
2754 printk(KERN_CONT
": block %llu", (unsigned long long)
2755 le64_to_cpu(es
->s_first_error_block
));
2756 printk(KERN_CONT
"\n");
2758 if (es
->s_last_error_time
) {
2759 printk(KERN_NOTICE
"EXT4-fs (%s): last error at time %u: %.*s:%d",
2760 sb
->s_id
, le32_to_cpu(es
->s_last_error_time
),
2761 (int) sizeof(es
->s_last_error_func
),
2762 es
->s_last_error_func
,
2763 le32_to_cpu(es
->s_last_error_line
));
2764 if (es
->s_last_error_ino
)
2765 printk(KERN_CONT
": inode %u",
2766 le32_to_cpu(es
->s_last_error_ino
));
2767 if (es
->s_last_error_block
)
2768 printk(KERN_CONT
": block %llu", (unsigned long long)
2769 le64_to_cpu(es
->s_last_error_block
));
2770 printk(KERN_CONT
"\n");
2772 mod_timer(&sbi
->s_err_report
, jiffies
+ 24*60*60*HZ
); /* Once a day */
2775 /* Find next suitable group and run ext4_init_inode_table */
2776 static int ext4_run_li_request(struct ext4_li_request
*elr
)
2778 struct ext4_group_desc
*gdp
= NULL
;
2779 ext4_group_t group
, ngroups
;
2780 struct super_block
*sb
;
2781 unsigned long timeout
= 0;
2785 ngroups
= EXT4_SB(sb
)->s_groups_count
;
2787 for (group
= elr
->lr_next_group
; group
< ngroups
; group
++) {
2788 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2794 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2798 if (group
>= ngroups
)
2803 ret
= ext4_init_inode_table(sb
, group
,
2804 elr
->lr_timeout
? 0 : 1);
2805 if (elr
->lr_timeout
== 0) {
2806 timeout
= (jiffies
- timeout
) *
2807 elr
->lr_sbi
->s_li_wait_mult
;
2808 elr
->lr_timeout
= timeout
;
2810 elr
->lr_next_sched
= jiffies
+ elr
->lr_timeout
;
2811 elr
->lr_next_group
= group
+ 1;
2817 * Remove lr_request from the list_request and free the
2818 * request structure. Should be called with li_list_mtx held
2820 static void ext4_remove_li_request(struct ext4_li_request
*elr
)
2822 struct ext4_sb_info
*sbi
;
2829 list_del(&elr
->lr_request
);
2830 sbi
->s_li_request
= NULL
;
2834 static void ext4_unregister_li_request(struct super_block
*sb
)
2836 mutex_lock(&ext4_li_mtx
);
2837 if (!ext4_li_info
) {
2838 mutex_unlock(&ext4_li_mtx
);
2842 mutex_lock(&ext4_li_info
->li_list_mtx
);
2843 ext4_remove_li_request(EXT4_SB(sb
)->s_li_request
);
2844 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2845 mutex_unlock(&ext4_li_mtx
);
2848 static struct task_struct
*ext4_lazyinit_task
;
2851 * This is the function where ext4lazyinit thread lives. It walks
2852 * through the request list searching for next scheduled filesystem.
2853 * When such a fs is found, run the lazy initialization request
2854 * (ext4_rn_li_request) and keep track of the time spend in this
2855 * function. Based on that time we compute next schedule time of
2856 * the request. When walking through the list is complete, compute
2857 * next waking time and put itself into sleep.
2859 static int ext4_lazyinit_thread(void *arg
)
2861 struct ext4_lazy_init
*eli
= (struct ext4_lazy_init
*)arg
;
2862 struct list_head
*pos
, *n
;
2863 struct ext4_li_request
*elr
;
2864 unsigned long next_wakeup
, cur
;
2866 BUG_ON(NULL
== eli
);
2870 next_wakeup
= MAX_JIFFY_OFFSET
;
2872 mutex_lock(&eli
->li_list_mtx
);
2873 if (list_empty(&eli
->li_request_list
)) {
2874 mutex_unlock(&eli
->li_list_mtx
);
2877 list_for_each_safe(pos
, n
, &eli
->li_request_list
) {
2880 elr
= list_entry(pos
, struct ext4_li_request
,
2883 if (time_before(jiffies
, elr
->lr_next_sched
)) {
2884 if (time_before(elr
->lr_next_sched
, next_wakeup
))
2885 next_wakeup
= elr
->lr_next_sched
;
2888 if (down_read_trylock(&elr
->lr_super
->s_umount
)) {
2889 if (sb_start_write_trylock(elr
->lr_super
)) {
2892 * We hold sb->s_umount, sb can not
2893 * be removed from the list, it is
2894 * now safe to drop li_list_mtx
2896 mutex_unlock(&eli
->li_list_mtx
);
2897 err
= ext4_run_li_request(elr
);
2898 sb_end_write(elr
->lr_super
);
2899 mutex_lock(&eli
->li_list_mtx
);
2902 up_read((&elr
->lr_super
->s_umount
));
2904 /* error, remove the lazy_init job */
2906 ext4_remove_li_request(elr
);
2910 elr
->lr_next_sched
= jiffies
+
2912 % (EXT4_DEF_LI_MAX_START_DELAY
* HZ
));
2914 if (time_before(elr
->lr_next_sched
, next_wakeup
))
2915 next_wakeup
= elr
->lr_next_sched
;
2917 mutex_unlock(&eli
->li_list_mtx
);
2922 if ((time_after_eq(cur
, next_wakeup
)) ||
2923 (MAX_JIFFY_OFFSET
== next_wakeup
)) {
2928 schedule_timeout_interruptible(next_wakeup
- cur
);
2930 if (kthread_should_stop()) {
2931 ext4_clear_request_list();
2938 * It looks like the request list is empty, but we need
2939 * to check it under the li_list_mtx lock, to prevent any
2940 * additions into it, and of course we should lock ext4_li_mtx
2941 * to atomically free the list and ext4_li_info, because at
2942 * this point another ext4 filesystem could be registering
2945 mutex_lock(&ext4_li_mtx
);
2946 mutex_lock(&eli
->li_list_mtx
);
2947 if (!list_empty(&eli
->li_request_list
)) {
2948 mutex_unlock(&eli
->li_list_mtx
);
2949 mutex_unlock(&ext4_li_mtx
);
2952 mutex_unlock(&eli
->li_list_mtx
);
2953 kfree(ext4_li_info
);
2954 ext4_li_info
= NULL
;
2955 mutex_unlock(&ext4_li_mtx
);
2960 static void ext4_clear_request_list(void)
2962 struct list_head
*pos
, *n
;
2963 struct ext4_li_request
*elr
;
2965 mutex_lock(&ext4_li_info
->li_list_mtx
);
2966 list_for_each_safe(pos
, n
, &ext4_li_info
->li_request_list
) {
2967 elr
= list_entry(pos
, struct ext4_li_request
,
2969 ext4_remove_li_request(elr
);
2971 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2974 static int ext4_run_lazyinit_thread(void)
2976 ext4_lazyinit_task
= kthread_run(ext4_lazyinit_thread
,
2977 ext4_li_info
, "ext4lazyinit");
2978 if (IS_ERR(ext4_lazyinit_task
)) {
2979 int err
= PTR_ERR(ext4_lazyinit_task
);
2980 ext4_clear_request_list();
2981 kfree(ext4_li_info
);
2982 ext4_li_info
= NULL
;
2983 printk(KERN_CRIT
"EXT4-fs: error %d creating inode table "
2984 "initialization thread\n",
2988 ext4_li_info
->li_state
|= EXT4_LAZYINIT_RUNNING
;
2993 * Check whether it make sense to run itable init. thread or not.
2994 * If there is at least one uninitialized inode table, return
2995 * corresponding group number, else the loop goes through all
2996 * groups and return total number of groups.
2998 static ext4_group_t
ext4_has_uninit_itable(struct super_block
*sb
)
3000 ext4_group_t group
, ngroups
= EXT4_SB(sb
)->s_groups_count
;
3001 struct ext4_group_desc
*gdp
= NULL
;
3003 for (group
= 0; group
< ngroups
; group
++) {
3004 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
3008 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
3015 static int ext4_li_info_new(void)
3017 struct ext4_lazy_init
*eli
= NULL
;
3019 eli
= kzalloc(sizeof(*eli
), GFP_KERNEL
);
3023 INIT_LIST_HEAD(&eli
->li_request_list
);
3024 mutex_init(&eli
->li_list_mtx
);
3026 eli
->li_state
|= EXT4_LAZYINIT_QUIT
;
3033 static struct ext4_li_request
*ext4_li_request_new(struct super_block
*sb
,
3036 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3037 struct ext4_li_request
*elr
;
3039 elr
= kzalloc(sizeof(*elr
), GFP_KERNEL
);
3045 elr
->lr_next_group
= start
;
3048 * Randomize first schedule time of the request to
3049 * spread the inode table initialization requests
3052 elr
->lr_next_sched
= jiffies
+ (prandom_u32() %
3053 (EXT4_DEF_LI_MAX_START_DELAY
* HZ
));
3057 int ext4_register_li_request(struct super_block
*sb
,
3058 ext4_group_t first_not_zeroed
)
3060 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3061 struct ext4_li_request
*elr
= NULL
;
3062 ext4_group_t ngroups
= EXT4_SB(sb
)->s_groups_count
;
3065 mutex_lock(&ext4_li_mtx
);
3066 if (sbi
->s_li_request
!= NULL
) {
3068 * Reset timeout so it can be computed again, because
3069 * s_li_wait_mult might have changed.
3071 sbi
->s_li_request
->lr_timeout
= 0;
3075 if (first_not_zeroed
== ngroups
||
3076 (sb
->s_flags
& MS_RDONLY
) ||
3077 !test_opt(sb
, INIT_INODE_TABLE
))
3080 elr
= ext4_li_request_new(sb
, first_not_zeroed
);
3086 if (NULL
== ext4_li_info
) {
3087 ret
= ext4_li_info_new();
3092 mutex_lock(&ext4_li_info
->li_list_mtx
);
3093 list_add(&elr
->lr_request
, &ext4_li_info
->li_request_list
);
3094 mutex_unlock(&ext4_li_info
->li_list_mtx
);
3096 sbi
->s_li_request
= elr
;
3098 * set elr to NULL here since it has been inserted to
3099 * the request_list and the removal and free of it is
3100 * handled by ext4_clear_request_list from now on.
3104 if (!(ext4_li_info
->li_state
& EXT4_LAZYINIT_RUNNING
)) {
3105 ret
= ext4_run_lazyinit_thread();
3110 mutex_unlock(&ext4_li_mtx
);
3117 * We do not need to lock anything since this is called on
3120 static void ext4_destroy_lazyinit_thread(void)
3123 * If thread exited earlier
3124 * there's nothing to be done.
3126 if (!ext4_li_info
|| !ext4_lazyinit_task
)
3129 kthread_stop(ext4_lazyinit_task
);
3132 static int set_journal_csum_feature_set(struct super_block
*sb
)
3135 int compat
, incompat
;
3136 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3138 if (ext4_has_metadata_csum(sb
)) {
3139 /* journal checksum v3 */
3141 incompat
= JBD2_FEATURE_INCOMPAT_CSUM_V3
;
3143 /* journal checksum v1 */
3144 compat
= JBD2_FEATURE_COMPAT_CHECKSUM
;
3148 jbd2_journal_clear_features(sbi
->s_journal
,
3149 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
3150 JBD2_FEATURE_INCOMPAT_CSUM_V3
|
3151 JBD2_FEATURE_INCOMPAT_CSUM_V2
);
3152 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
3153 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3155 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
|
3157 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
3158 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3161 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3162 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3164 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3165 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3172 * Note: calculating the overhead so we can be compatible with
3173 * historical BSD practice is quite difficult in the face of
3174 * clusters/bigalloc. This is because multiple metadata blocks from
3175 * different block group can end up in the same allocation cluster.
3176 * Calculating the exact overhead in the face of clustered allocation
3177 * requires either O(all block bitmaps) in memory or O(number of block
3178 * groups**2) in time. We will still calculate the superblock for
3179 * older file systems --- and if we come across with a bigalloc file
3180 * system with zero in s_overhead_clusters the estimate will be close to
3181 * correct especially for very large cluster sizes --- but for newer
3182 * file systems, it's better to calculate this figure once at mkfs
3183 * time, and store it in the superblock. If the superblock value is
3184 * present (even for non-bigalloc file systems), we will use it.
3186 static int count_overhead(struct super_block
*sb
, ext4_group_t grp
,
3189 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3190 struct ext4_group_desc
*gdp
;
3191 ext4_fsblk_t first_block
, last_block
, b
;
3192 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3193 int s
, j
, count
= 0;
3195 if (!ext4_has_feature_bigalloc(sb
))
3196 return (ext4_bg_has_super(sb
, grp
) + ext4_bg_num_gdb(sb
, grp
) +
3197 sbi
->s_itb_per_group
+ 2);
3199 first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
) +
3200 (grp
* EXT4_BLOCKS_PER_GROUP(sb
));
3201 last_block
= first_block
+ EXT4_BLOCKS_PER_GROUP(sb
) - 1;
3202 for (i
= 0; i
< ngroups
; i
++) {
3203 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
3204 b
= ext4_block_bitmap(sb
, gdp
);
3205 if (b
>= first_block
&& b
<= last_block
) {
3206 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3209 b
= ext4_inode_bitmap(sb
, gdp
);
3210 if (b
>= first_block
&& b
<= last_block
) {
3211 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3214 b
= ext4_inode_table(sb
, gdp
);
3215 if (b
>= first_block
&& b
+ sbi
->s_itb_per_group
<= last_block
)
3216 for (j
= 0; j
< sbi
->s_itb_per_group
; j
++, b
++) {
3217 int c
= EXT4_B2C(sbi
, b
- first_block
);
3218 ext4_set_bit(c
, buf
);
3224 if (ext4_bg_has_super(sb
, grp
)) {
3225 ext4_set_bit(s
++, buf
);
3228 j
= ext4_bg_num_gdb(sb
, grp
);
3229 if (s
+ j
> EXT4_BLOCKS_PER_GROUP(sb
)) {
3230 ext4_error(sb
, "Invalid number of block group "
3231 "descriptor blocks: %d", j
);
3232 j
= EXT4_BLOCKS_PER_GROUP(sb
) - s
;
3236 ext4_set_bit(EXT4_B2C(sbi
, s
++), buf
);
3240 return EXT4_CLUSTERS_PER_GROUP(sb
) -
3241 ext4_count_free(buf
, EXT4_CLUSTERS_PER_GROUP(sb
) / 8);
3245 * Compute the overhead and stash it in sbi->s_overhead
3247 int ext4_calculate_overhead(struct super_block
*sb
)
3249 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3250 struct ext4_super_block
*es
= sbi
->s_es
;
3251 struct inode
*j_inode
;
3252 unsigned int j_blocks
, j_inum
= le32_to_cpu(es
->s_journal_inum
);
3253 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3254 ext4_fsblk_t overhead
= 0;
3255 char *buf
= (char *) get_zeroed_page(GFP_NOFS
);
3261 * Compute the overhead (FS structures). This is constant
3262 * for a given filesystem unless the number of block groups
3263 * changes so we cache the previous value until it does.
3267 * All of the blocks before first_data_block are overhead
3269 overhead
= EXT4_B2C(sbi
, le32_to_cpu(es
->s_first_data_block
));
3272 * Add the overhead found in each block group
3274 for (i
= 0; i
< ngroups
; i
++) {
3277 blks
= count_overhead(sb
, i
, buf
);
3280 memset(buf
, 0, PAGE_SIZE
);
3285 * Add the internal journal blocks whether the journal has been
3288 if (sbi
->s_journal
&& !sbi
->journal_bdev
)
3289 overhead
+= EXT4_NUM_B2C(sbi
, sbi
->s_journal
->j_maxlen
);
3290 else if (ext4_has_feature_journal(sb
) && !sbi
->s_journal
) {
3291 j_inode
= ext4_get_journal_inode(sb
, j_inum
);
3293 j_blocks
= j_inode
->i_size
>> sb
->s_blocksize_bits
;
3294 overhead
+= EXT4_NUM_B2C(sbi
, j_blocks
);
3297 ext4_msg(sb
, KERN_ERR
, "can't get journal size");
3300 sbi
->s_overhead
= overhead
;
3302 free_page((unsigned long) buf
);
3306 static void ext4_set_resv_clusters(struct super_block
*sb
)
3308 ext4_fsblk_t resv_clusters
;
3309 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3312 * There's no need to reserve anything when we aren't using extents.
3313 * The space estimates are exact, there are no unwritten extents,
3314 * hole punching doesn't need new metadata... This is needed especially
3315 * to keep ext2/3 backward compatibility.
3317 if (!ext4_has_feature_extents(sb
))
3320 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3321 * This should cover the situations where we can not afford to run
3322 * out of space like for example punch hole, or converting
3323 * unwritten extents in delalloc path. In most cases such
3324 * allocation would require 1, or 2 blocks, higher numbers are
3327 resv_clusters
= (ext4_blocks_count(sbi
->s_es
) >>
3328 sbi
->s_cluster_bits
);
3330 do_div(resv_clusters
, 50);
3331 resv_clusters
= min_t(ext4_fsblk_t
, resv_clusters
, 4096);
3333 atomic64_set(&sbi
->s_resv_clusters
, resv_clusters
);
3336 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
3338 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
3339 struct buffer_head
*bh
;
3340 struct ext4_super_block
*es
= NULL
;
3341 struct ext4_sb_info
*sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
3343 ext4_fsblk_t sb_block
= get_sb_block(&data
);
3344 ext4_fsblk_t logical_sb_block
;
3345 unsigned long offset
= 0;
3346 unsigned long journal_devnum
= 0;
3347 unsigned long def_mount_opts
;
3351 int blocksize
, clustersize
;
3352 unsigned int db_count
;
3354 int needs_recovery
, has_huge_files
, has_bigalloc
;
3357 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3358 ext4_group_t first_not_zeroed
;
3360 if ((data
&& !orig_data
) || !sbi
)
3363 sbi
->s_blockgroup_lock
=
3364 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
3365 if (!sbi
->s_blockgroup_lock
)
3368 sb
->s_fs_info
= sbi
;
3370 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
3371 sbi
->s_sb_block
= sb_block
;
3372 if (sb
->s_bdev
->bd_part
)
3373 sbi
->s_sectors_written_start
=
3374 part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]);
3376 /* Cleanup superblock name */
3377 strreplace(sb
->s_id
, '/', '!');
3379 /* -EINVAL is default */
3381 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
3383 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
3388 * The ext4 superblock will not be buffer aligned for other than 1kB
3389 * block sizes. We need to calculate the offset from buffer start.
3391 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
3392 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3393 offset
= do_div(logical_sb_block
, blocksize
);
3395 logical_sb_block
= sb_block
;
3398 if (!(bh
= sb_bread_unmovable(sb
, logical_sb_block
))) {
3399 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
3403 * Note: s_es must be initialized as soon as possible because
3404 * some ext4 macro-instructions depend on its value
3406 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
3408 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
3409 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
3411 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
3413 /* Warn if metadata_csum and gdt_csum are both set. */
3414 if (ext4_has_feature_metadata_csum(sb
) &&
3415 ext4_has_feature_gdt_csum(sb
))
3416 ext4_warning(sb
, "metadata_csum and uninit_bg are "
3417 "redundant flags; please run fsck.");
3419 /* Check for a known checksum algorithm */
3420 if (!ext4_verify_csum_type(sb
, es
)) {
3421 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3422 "unknown checksum algorithm.");
3427 /* Load the checksum driver */
3428 if (ext4_has_feature_metadata_csum(sb
)) {
3429 sbi
->s_chksum_driver
= crypto_alloc_shash("crc32c", 0, 0);
3430 if (IS_ERR(sbi
->s_chksum_driver
)) {
3431 ext4_msg(sb
, KERN_ERR
, "Cannot load crc32c driver.");
3432 ret
= PTR_ERR(sbi
->s_chksum_driver
);
3433 sbi
->s_chksum_driver
= NULL
;
3438 /* Check superblock checksum */
3439 if (!ext4_superblock_csum_verify(sb
, es
)) {
3440 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3441 "invalid superblock checksum. Run e2fsck?");
3447 /* Precompute checksum seed for all metadata */
3448 if (ext4_has_feature_csum_seed(sb
))
3449 sbi
->s_csum_seed
= le32_to_cpu(es
->s_checksum_seed
);
3450 else if (ext4_has_metadata_csum(sb
))
3451 sbi
->s_csum_seed
= ext4_chksum(sbi
, ~0, es
->s_uuid
,
3452 sizeof(es
->s_uuid
));
3454 /* Set defaults before we parse the mount options */
3455 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
3456 set_opt(sb
, INIT_INODE_TABLE
);
3457 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
3459 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
3461 if (def_mount_opts
& EXT4_DEFM_UID16
)
3462 set_opt(sb
, NO_UID32
);
3463 /* xattr user namespace & acls are now defaulted on */
3464 set_opt(sb
, XATTR_USER
);
3465 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3466 set_opt(sb
, POSIX_ACL
);
3468 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3469 if (ext4_has_metadata_csum(sb
))
3470 set_opt(sb
, JOURNAL_CHECKSUM
);
3472 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
3473 set_opt(sb
, JOURNAL_DATA
);
3474 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
3475 set_opt(sb
, ORDERED_DATA
);
3476 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
3477 set_opt(sb
, WRITEBACK_DATA
);
3479 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
3480 set_opt(sb
, ERRORS_PANIC
);
3481 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
3482 set_opt(sb
, ERRORS_CONT
);
3484 set_opt(sb
, ERRORS_RO
);
3485 /* block_validity enabled by default; disable with noblock_validity */
3486 set_opt(sb
, BLOCK_VALIDITY
);
3487 if (def_mount_opts
& EXT4_DEFM_DISCARD
)
3488 set_opt(sb
, DISCARD
);
3490 sbi
->s_resuid
= make_kuid(&init_user_ns
, le16_to_cpu(es
->s_def_resuid
));
3491 sbi
->s_resgid
= make_kgid(&init_user_ns
, le16_to_cpu(es
->s_def_resgid
));
3492 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
3493 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
3494 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
3496 if ((def_mount_opts
& EXT4_DEFM_NOBARRIER
) == 0)
3497 set_opt(sb
, BARRIER
);
3500 * enable delayed allocation by default
3501 * Use -o nodelalloc to turn it off
3503 if (!IS_EXT3_SB(sb
) && !IS_EXT2_SB(sb
) &&
3504 ((def_mount_opts
& EXT4_DEFM_NODELALLOC
) == 0))
3505 set_opt(sb
, DELALLOC
);
3508 * set default s_li_wait_mult for lazyinit, for the case there is
3509 * no mount option specified.
3511 sbi
->s_li_wait_mult
= EXT4_DEF_LI_WAIT_MULT
;
3513 if (sbi
->s_es
->s_mount_opts
[0]) {
3514 char *s_mount_opts
= kstrndup(sbi
->s_es
->s_mount_opts
,
3515 sizeof(sbi
->s_es
->s_mount_opts
),
3519 if (!parse_options(s_mount_opts
, sb
, &journal_devnum
,
3520 &journal_ioprio
, 0)) {
3521 ext4_msg(sb
, KERN_WARNING
,
3522 "failed to parse options in superblock: %s",
3525 kfree(s_mount_opts
);
3527 sbi
->s_def_mount_opt
= sbi
->s_mount_opt
;
3528 if (!parse_options((char *) data
, sb
, &journal_devnum
,
3529 &journal_ioprio
, 0))
3532 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
3533 printk_once(KERN_WARNING
"EXT4-fs: Warning: mounting "
3534 "with data=journal disables delayed "
3535 "allocation and O_DIRECT support!\n");
3536 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
3537 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3538 "both data=journal and delalloc");
3541 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
3542 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3543 "both data=journal and dioread_nolock");
3546 if (test_opt(sb
, DAX
)) {
3547 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3548 "both data=journal and dax");
3551 if (ext4_has_feature_encrypt(sb
)) {
3552 ext4_msg(sb
, KERN_WARNING
,
3553 "encrypted files will use data=ordered "
3554 "instead of data journaling mode");
3556 if (test_opt(sb
, DELALLOC
))
3557 clear_opt(sb
, DELALLOC
);
3559 sb
->s_iflags
|= SB_I_CGROUPWB
;
3562 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3563 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
3565 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
3566 (ext4_has_compat_features(sb
) ||
3567 ext4_has_ro_compat_features(sb
) ||
3568 ext4_has_incompat_features(sb
)))
3569 ext4_msg(sb
, KERN_WARNING
,
3570 "feature flags set on rev 0 fs, "
3571 "running e2fsck is recommended");
3573 if (es
->s_creator_os
== cpu_to_le32(EXT4_OS_HURD
)) {
3574 set_opt2(sb
, HURD_COMPAT
);
3575 if (ext4_has_feature_64bit(sb
)) {
3576 ext4_msg(sb
, KERN_ERR
,
3577 "The Hurd can't support 64-bit file systems");
3582 if (IS_EXT2_SB(sb
)) {
3583 if (ext2_feature_set_ok(sb
))
3584 ext4_msg(sb
, KERN_INFO
, "mounting ext2 file system "
3585 "using the ext4 subsystem");
3587 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext2 due "
3588 "to feature incompatibilities");
3593 if (IS_EXT3_SB(sb
)) {
3594 if (ext3_feature_set_ok(sb
))
3595 ext4_msg(sb
, KERN_INFO
, "mounting ext3 file system "
3596 "using the ext4 subsystem");
3598 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext3 due "
3599 "to feature incompatibilities");
3605 * Check feature flags regardless of the revision level, since we
3606 * previously didn't change the revision level when setting the flags,
3607 * so there is a chance incompat flags are set on a rev 0 filesystem.
3609 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
3612 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
3613 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
3614 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
3615 ext4_msg(sb
, KERN_ERR
,
3616 "Unsupported filesystem blocksize %d (%d log_block_size)",
3617 blocksize
, le32_to_cpu(es
->s_log_block_size
));
3620 if (le32_to_cpu(es
->s_log_block_size
) >
3621 (EXT4_MAX_BLOCK_LOG_SIZE
- EXT4_MIN_BLOCK_LOG_SIZE
)) {
3622 ext4_msg(sb
, KERN_ERR
,
3623 "Invalid log block size: %u",
3624 le32_to_cpu(es
->s_log_block_size
));
3628 if (le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
) > (blocksize
/ 4)) {
3629 ext4_msg(sb
, KERN_ERR
,
3630 "Number of reserved GDT blocks insanely large: %d",
3631 le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
));
3635 if (sbi
->s_mount_opt
& EXT4_MOUNT_DAX
) {
3636 err
= bdev_dax_supported(sb
, blocksize
);
3641 if (ext4_has_feature_encrypt(sb
) && es
->s_encryption_level
) {
3642 ext4_msg(sb
, KERN_ERR
, "Unsupported encryption level %d",
3643 es
->s_encryption_level
);
3647 if (sb
->s_blocksize
!= blocksize
) {
3648 /* Validate the filesystem blocksize */
3649 if (!sb_set_blocksize(sb
, blocksize
)) {
3650 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
3656 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3657 offset
= do_div(logical_sb_block
, blocksize
);
3658 bh
= sb_bread_unmovable(sb
, logical_sb_block
);
3660 ext4_msg(sb
, KERN_ERR
,
3661 "Can't read superblock on 2nd try");
3664 es
= (struct ext4_super_block
*)(bh
->b_data
+ offset
);
3666 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
3667 ext4_msg(sb
, KERN_ERR
,
3668 "Magic mismatch, very weird!");
3673 has_huge_files
= ext4_has_feature_huge_file(sb
);
3674 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
3676 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
3678 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
3679 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
3680 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
3682 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
3683 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
3684 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
3685 (!is_power_of_2(sbi
->s_inode_size
)) ||
3686 (sbi
->s_inode_size
> blocksize
)) {
3687 ext4_msg(sb
, KERN_ERR
,
3688 "unsupported inode size: %d",
3692 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
3693 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
3696 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
3697 if (ext4_has_feature_64bit(sb
)) {
3698 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
3699 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
3700 !is_power_of_2(sbi
->s_desc_size
)) {
3701 ext4_msg(sb
, KERN_ERR
,
3702 "unsupported descriptor size %lu",
3707 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
3709 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
3710 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
3712 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
3713 if (sbi
->s_inodes_per_block
== 0)
3715 if (sbi
->s_inodes_per_group
< sbi
->s_inodes_per_block
||
3716 sbi
->s_inodes_per_group
> blocksize
* 8) {
3717 ext4_msg(sb
, KERN_ERR
, "invalid inodes per group: %lu\n",
3718 sbi
->s_blocks_per_group
);
3721 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
3722 sbi
->s_inodes_per_block
;
3723 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
3725 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3726 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
3727 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
3729 for (i
= 0; i
< 4; i
++)
3730 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
3731 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
3732 if (ext4_has_feature_dir_index(sb
)) {
3733 i
= le32_to_cpu(es
->s_flags
);
3734 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
3735 sbi
->s_hash_unsigned
= 3;
3736 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
3737 #ifdef __CHAR_UNSIGNED__
3738 if (!(sb
->s_flags
& MS_RDONLY
))
3740 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
3741 sbi
->s_hash_unsigned
= 3;
3743 if (!(sb
->s_flags
& MS_RDONLY
))
3745 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
3750 /* Handle clustersize */
3751 clustersize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_cluster_size
);
3752 has_bigalloc
= ext4_has_feature_bigalloc(sb
);
3754 if (clustersize
< blocksize
) {
3755 ext4_msg(sb
, KERN_ERR
,
3756 "cluster size (%d) smaller than "
3757 "block size (%d)", clustersize
, blocksize
);
3760 if (le32_to_cpu(es
->s_log_cluster_size
) >
3761 (EXT4_MAX_CLUSTER_LOG_SIZE
- EXT4_MIN_BLOCK_LOG_SIZE
)) {
3762 ext4_msg(sb
, KERN_ERR
,
3763 "Invalid log cluster size: %u",
3764 le32_to_cpu(es
->s_log_cluster_size
));
3767 sbi
->s_cluster_bits
= le32_to_cpu(es
->s_log_cluster_size
) -
3768 le32_to_cpu(es
->s_log_block_size
);
3769 sbi
->s_clusters_per_group
=
3770 le32_to_cpu(es
->s_clusters_per_group
);
3771 if (sbi
->s_clusters_per_group
> blocksize
* 8) {
3772 ext4_msg(sb
, KERN_ERR
,
3773 "#clusters per group too big: %lu",
3774 sbi
->s_clusters_per_group
);
3777 if (sbi
->s_blocks_per_group
!=
3778 (sbi
->s_clusters_per_group
* (clustersize
/ blocksize
))) {
3779 ext4_msg(sb
, KERN_ERR
, "blocks per group (%lu) and "
3780 "clusters per group (%lu) inconsistent",
3781 sbi
->s_blocks_per_group
,
3782 sbi
->s_clusters_per_group
);
3786 if (clustersize
!= blocksize
) {
3787 ext4_warning(sb
, "fragment/cluster size (%d) != "
3788 "block size (%d)", clustersize
,
3790 clustersize
= blocksize
;
3792 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
3793 ext4_msg(sb
, KERN_ERR
,
3794 "#blocks per group too big: %lu",
3795 sbi
->s_blocks_per_group
);
3798 sbi
->s_clusters_per_group
= sbi
->s_blocks_per_group
;
3799 sbi
->s_cluster_bits
= 0;
3801 sbi
->s_cluster_ratio
= clustersize
/ blocksize
;
3803 /* Do we have standard group size of clustersize * 8 blocks ? */
3804 if (sbi
->s_blocks_per_group
== clustersize
<< 3)
3805 set_opt2(sb
, STD_GROUP_SIZE
);
3808 * Test whether we have more sectors than will fit in sector_t,
3809 * and whether the max offset is addressable by the page cache.
3811 err
= generic_check_addressable(sb
->s_blocksize_bits
,
3812 ext4_blocks_count(es
));
3814 ext4_msg(sb
, KERN_ERR
, "filesystem"
3815 " too large to mount safely on this system");
3816 if (sizeof(sector_t
) < 8)
3817 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
3821 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
3824 /* check blocks count against device size */
3825 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
3826 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
3827 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
3828 "exceeds size of device (%llu blocks)",
3829 ext4_blocks_count(es
), blocks_count
);
3834 * It makes no sense for the first data block to be beyond the end
3835 * of the filesystem.
3837 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
3838 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data "
3839 "block %u is beyond end of filesystem (%llu)",
3840 le32_to_cpu(es
->s_first_data_block
),
3841 ext4_blocks_count(es
));
3844 blocks_count
= (ext4_blocks_count(es
) -
3845 le32_to_cpu(es
->s_first_data_block
) +
3846 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
3847 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
3848 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
3849 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
3850 "(block count %llu, first data block %u, "
3851 "blocks per group %lu)", sbi
->s_groups_count
,
3852 ext4_blocks_count(es
),
3853 le32_to_cpu(es
->s_first_data_block
),
3854 EXT4_BLOCKS_PER_GROUP(sb
));
3857 sbi
->s_groups_count
= blocks_count
;
3858 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
3859 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
3860 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
3861 EXT4_DESC_PER_BLOCK(sb
);
3862 if (ext4_has_feature_meta_bg(sb
)) {
3863 if (le32_to_cpu(es
->s_first_meta_bg
) > db_count
) {
3864 ext4_msg(sb
, KERN_WARNING
,
3865 "first meta block group too large: %u "
3866 "(group descriptor block count %u)",
3867 le32_to_cpu(es
->s_first_meta_bg
), db_count
);
3871 sbi
->s_group_desc
= ext4_kvmalloc(db_count
*
3872 sizeof(struct buffer_head
*),
3874 if (sbi
->s_group_desc
== NULL
) {
3875 ext4_msg(sb
, KERN_ERR
, "not enough memory");
3880 bgl_lock_init(sbi
->s_blockgroup_lock
);
3882 for (i
= 0; i
< db_count
; i
++) {
3883 block
= descriptor_loc(sb
, logical_sb_block
, i
);
3884 sbi
->s_group_desc
[i
] = sb_bread_unmovable(sb
, block
);
3885 if (!sbi
->s_group_desc
[i
]) {
3886 ext4_msg(sb
, KERN_ERR
,
3887 "can't read group descriptor %d", i
);
3892 if (!ext4_check_descriptors(sb
, logical_sb_block
, &first_not_zeroed
)) {
3893 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
3894 ret
= -EFSCORRUPTED
;
3898 sbi
->s_gdb_count
= db_count
;
3899 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
3900 spin_lock_init(&sbi
->s_next_gen_lock
);
3902 setup_timer(&sbi
->s_err_report
, print_daily_error_info
,
3903 (unsigned long) sb
);
3905 /* Register extent status tree shrinker */
3906 if (ext4_es_register_shrinker(sbi
))
3909 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
3910 sbi
->s_extent_max_zeroout_kb
= 32;
3913 * set up enough so that it can read an inode
3915 sb
->s_op
= &ext4_sops
;
3916 sb
->s_export_op
= &ext4_export_ops
;
3917 sb
->s_xattr
= ext4_xattr_handlers
;
3918 sb
->s_cop
= &ext4_cryptops
;
3920 sb
->dq_op
= &ext4_quota_operations
;
3921 if (ext4_has_feature_quota(sb
))
3922 sb
->s_qcop
= &dquot_quotactl_sysfile_ops
;
3924 sb
->s_qcop
= &ext4_qctl_operations
;
3925 sb
->s_quota_types
= QTYPE_MASK_USR
| QTYPE_MASK_GRP
| QTYPE_MASK_PRJ
;
3927 memcpy(sb
->s_uuid
, es
->s_uuid
, sizeof(es
->s_uuid
));
3929 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
3930 mutex_init(&sbi
->s_orphan_lock
);
3934 needs_recovery
= (es
->s_last_orphan
!= 0 ||
3935 ext4_has_feature_journal_needs_recovery(sb
));
3937 if (ext4_has_feature_mmp(sb
) && !(sb
->s_flags
& MS_RDONLY
))
3938 if (ext4_multi_mount_protect(sb
, le64_to_cpu(es
->s_mmp_block
)))
3939 goto failed_mount3a
;
3942 * The first inode we look at is the journal inode. Don't try
3943 * root first: it may be modified in the journal!
3945 if (!test_opt(sb
, NOLOAD
) && ext4_has_feature_journal(sb
)) {
3946 err
= ext4_load_journal(sb
, es
, journal_devnum
);
3948 goto failed_mount3a
;
3949 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
3950 ext4_has_feature_journal_needs_recovery(sb
)) {
3951 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
3952 "suppressed and not mounted read-only");
3953 goto failed_mount_wq
;
3955 /* Nojournal mode, all journal mount options are illegal */
3956 if (test_opt2(sb
, EXPLICIT_JOURNAL_CHECKSUM
)) {
3957 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3958 "journal_checksum, fs mounted w/o journal");
3959 goto failed_mount_wq
;
3961 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
3962 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3963 "journal_async_commit, fs mounted w/o journal");
3964 goto failed_mount_wq
;
3966 if (sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
) {
3967 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3968 "commit=%lu, fs mounted w/o journal",
3969 sbi
->s_commit_interval
/ HZ
);
3970 goto failed_mount_wq
;
3972 if (EXT4_MOUNT_DATA_FLAGS
&
3973 (sbi
->s_mount_opt
^ sbi
->s_def_mount_opt
)) {
3974 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3975 "data=, fs mounted w/o journal");
3976 goto failed_mount_wq
;
3978 sbi
->s_def_mount_opt
&= EXT4_MOUNT_JOURNAL_CHECKSUM
;
3979 clear_opt(sb
, JOURNAL_CHECKSUM
);
3980 clear_opt(sb
, DATA_FLAGS
);
3981 sbi
->s_journal
= NULL
;
3986 if (ext4_has_feature_64bit(sb
) &&
3987 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
3988 JBD2_FEATURE_INCOMPAT_64BIT
)) {
3989 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
3990 goto failed_mount_wq
;
3993 if (!set_journal_csum_feature_set(sb
)) {
3994 ext4_msg(sb
, KERN_ERR
, "Failed to set journal checksum "
3996 goto failed_mount_wq
;
3999 /* We have now updated the journal if required, so we can
4000 * validate the data journaling mode. */
4001 switch (test_opt(sb
, DATA_FLAGS
)) {
4003 /* No mode set, assume a default based on the journal
4004 * capabilities: ORDERED_DATA if the journal can
4005 * cope, else JOURNAL_DATA
4007 if (jbd2_journal_check_available_features
4008 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
4009 set_opt(sb
, ORDERED_DATA
);
4011 set_opt(sb
, JOURNAL_DATA
);
4014 case EXT4_MOUNT_ORDERED_DATA
:
4015 case EXT4_MOUNT_WRITEBACK_DATA
:
4016 if (!jbd2_journal_check_available_features
4017 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
4018 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
4019 "requested data journaling mode");
4020 goto failed_mount_wq
;
4026 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
&&
4027 test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
4028 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4029 "journal_async_commit in data=ordered mode");
4030 goto failed_mount_wq
;
4033 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
4035 sbi
->s_journal
->j_commit_callback
= ext4_journal_commit_callback
;
4038 sbi
->s_mb_cache
= ext4_xattr_create_cache();
4039 if (!sbi
->s_mb_cache
) {
4040 ext4_msg(sb
, KERN_ERR
, "Failed to create an mb_cache");
4041 goto failed_mount_wq
;
4044 if ((DUMMY_ENCRYPTION_ENABLED(sbi
) || ext4_has_feature_encrypt(sb
)) &&
4045 (blocksize
!= PAGE_SIZE
)) {
4046 ext4_msg(sb
, KERN_ERR
,
4047 "Unsupported blocksize for fs encryption");
4048 goto failed_mount_wq
;
4051 if (DUMMY_ENCRYPTION_ENABLED(sbi
) && !(sb
->s_flags
& MS_RDONLY
) &&
4052 !ext4_has_feature_encrypt(sb
)) {
4053 ext4_set_feature_encrypt(sb
);
4054 ext4_commit_super(sb
, 1);
4058 * Get the # of file system overhead blocks from the
4059 * superblock if present.
4061 if (es
->s_overhead_clusters
)
4062 sbi
->s_overhead
= le32_to_cpu(es
->s_overhead_clusters
);
4064 err
= ext4_calculate_overhead(sb
);
4066 goto failed_mount_wq
;
4070 * The maximum number of concurrent works can be high and
4071 * concurrency isn't really necessary. Limit it to 1.
4073 EXT4_SB(sb
)->rsv_conversion_wq
=
4074 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM
| WQ_UNBOUND
, 1);
4075 if (!EXT4_SB(sb
)->rsv_conversion_wq
) {
4076 printk(KERN_ERR
"EXT4-fs: failed to create workqueue\n");
4082 * The jbd2_journal_load will have done any necessary log recovery,
4083 * so we can safely mount the rest of the filesystem now.
4086 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
4088 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
4089 ret
= PTR_ERR(root
);
4093 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
4094 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
4098 sb
->s_root
= d_make_root(root
);
4100 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
4105 if (ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
))
4106 sb
->s_flags
|= MS_RDONLY
;
4108 /* determine the minimum size of new large inodes, if present */
4109 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
&&
4110 sbi
->s_want_extra_isize
== 0) {
4111 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
4112 EXT4_GOOD_OLD_INODE_SIZE
;
4113 if (ext4_has_feature_extra_isize(sb
)) {
4114 if (sbi
->s_want_extra_isize
<
4115 le16_to_cpu(es
->s_want_extra_isize
))
4116 sbi
->s_want_extra_isize
=
4117 le16_to_cpu(es
->s_want_extra_isize
);
4118 if (sbi
->s_want_extra_isize
<
4119 le16_to_cpu(es
->s_min_extra_isize
))
4120 sbi
->s_want_extra_isize
=
4121 le16_to_cpu(es
->s_min_extra_isize
);
4124 /* Check if enough inode space is available */
4125 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
4126 sbi
->s_inode_size
) {
4127 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
4128 EXT4_GOOD_OLD_INODE_SIZE
;
4129 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
4133 ext4_set_resv_clusters(sb
);
4135 err
= ext4_setup_system_zone(sb
);
4137 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
4139 goto failed_mount4a
;
4143 err
= ext4_mb_init(sb
);
4145 ext4_msg(sb
, KERN_ERR
, "failed to initialize mballoc (%d)",
4150 block
= ext4_count_free_clusters(sb
);
4151 ext4_free_blocks_count_set(sbi
->s_es
,
4152 EXT4_C2B(sbi
, block
));
4153 err
= percpu_counter_init(&sbi
->s_freeclusters_counter
, block
,
4156 unsigned long freei
= ext4_count_free_inodes(sb
);
4157 sbi
->s_es
->s_free_inodes_count
= cpu_to_le32(freei
);
4158 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
, freei
,
4162 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
4163 ext4_count_dirs(sb
), GFP_KERNEL
);
4165 err
= percpu_counter_init(&sbi
->s_dirtyclusters_counter
, 0,
4168 err
= percpu_init_rwsem(&sbi
->s_journal_flag_rwsem
);
4171 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
4175 if (ext4_has_feature_flex_bg(sb
))
4176 if (!ext4_fill_flex_info(sb
)) {
4177 ext4_msg(sb
, KERN_ERR
,
4178 "unable to initialize "
4179 "flex_bg meta info!");
4183 err
= ext4_register_li_request(sb
, first_not_zeroed
);
4187 err
= ext4_register_sysfs(sb
);
4192 /* Enable quota usage during mount. */
4193 if (ext4_has_feature_quota(sb
) && !(sb
->s_flags
& MS_RDONLY
)) {
4194 err
= ext4_enable_quotas(sb
);
4198 #endif /* CONFIG_QUOTA */
4200 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
4201 ext4_orphan_cleanup(sb
, es
);
4202 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
4203 if (needs_recovery
) {
4204 ext4_msg(sb
, KERN_INFO
, "recovery complete");
4205 ext4_mark_recovery_complete(sb
, es
);
4207 if (EXT4_SB(sb
)->s_journal
) {
4208 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
4209 descr
= " journalled data mode";
4210 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
4211 descr
= " ordered data mode";
4213 descr
= " writeback data mode";
4215 descr
= "out journal";
4217 if (test_opt(sb
, DISCARD
)) {
4218 struct request_queue
*q
= bdev_get_queue(sb
->s_bdev
);
4219 if (!blk_queue_discard(q
))
4220 ext4_msg(sb
, KERN_WARNING
,
4221 "mounting with \"discard\" option, but "
4222 "the device does not support discard");
4225 if (___ratelimit(&ext4_mount_msg_ratelimit
, "EXT4-fs mount"))
4226 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s. "
4227 "Opts: %.*s%s%s", descr
,
4228 (int) sizeof(sbi
->s_es
->s_mount_opts
),
4229 sbi
->s_es
->s_mount_opts
,
4230 *sbi
->s_es
->s_mount_opts
? "; " : "", orig_data
);
4232 if (es
->s_error_count
)
4233 mod_timer(&sbi
->s_err_report
, jiffies
+ 300*HZ
); /* 5 minutes */
4235 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4236 ratelimit_state_init(&sbi
->s_err_ratelimit_state
, 5 * HZ
, 10);
4237 ratelimit_state_init(&sbi
->s_warning_ratelimit_state
, 5 * HZ
, 10);
4238 ratelimit_state_init(&sbi
->s_msg_ratelimit_state
, 5 * HZ
, 10);
4245 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
4250 ext4_unregister_sysfs(sb
);
4253 ext4_unregister_li_request(sb
);
4255 ext4_mb_release(sb
);
4256 if (sbi
->s_flex_groups
)
4257 kvfree(sbi
->s_flex_groups
);
4258 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
4259 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
4260 percpu_counter_destroy(&sbi
->s_dirs_counter
);
4261 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
4263 ext4_ext_release(sb
);
4264 ext4_release_system_zone(sb
);
4269 ext4_msg(sb
, KERN_ERR
, "mount failed");
4270 if (EXT4_SB(sb
)->rsv_conversion_wq
)
4271 destroy_workqueue(EXT4_SB(sb
)->rsv_conversion_wq
);
4273 if (sbi
->s_mb_cache
) {
4274 ext4_xattr_destroy_cache(sbi
->s_mb_cache
);
4275 sbi
->s_mb_cache
= NULL
;
4277 if (sbi
->s_journal
) {
4278 jbd2_journal_destroy(sbi
->s_journal
);
4279 sbi
->s_journal
= NULL
;
4282 ext4_es_unregister_shrinker(sbi
);
4284 del_timer_sync(&sbi
->s_err_report
);
4286 kthread_stop(sbi
->s_mmp_tsk
);
4288 for (i
= 0; i
< db_count
; i
++)
4289 brelse(sbi
->s_group_desc
[i
]);
4290 kvfree(sbi
->s_group_desc
);
4292 if (sbi
->s_chksum_driver
)
4293 crypto_free_shash(sbi
->s_chksum_driver
);
4295 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
4296 kfree(sbi
->s_qf_names
[i
]);
4298 ext4_blkdev_remove(sbi
);
4301 sb
->s_fs_info
= NULL
;
4302 kfree(sbi
->s_blockgroup_lock
);
4306 return err
? err
: ret
;
4310 * Setup any per-fs journal parameters now. We'll do this both on
4311 * initial mount, once the journal has been initialised but before we've
4312 * done any recovery; and again on any subsequent remount.
4314 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
4316 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4318 journal
->j_commit_interval
= sbi
->s_commit_interval
;
4319 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
4320 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
4322 write_lock(&journal
->j_state_lock
);
4323 if (test_opt(sb
, BARRIER
))
4324 journal
->j_flags
|= JBD2_BARRIER
;
4326 journal
->j_flags
&= ~JBD2_BARRIER
;
4327 if (test_opt(sb
, DATA_ERR_ABORT
))
4328 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
4330 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
4331 write_unlock(&journal
->j_state_lock
);
4334 static struct inode
*ext4_get_journal_inode(struct super_block
*sb
,
4335 unsigned int journal_inum
)
4337 struct inode
*journal_inode
;
4340 * Test for the existence of a valid inode on disk. Bad things
4341 * happen if we iget() an unused inode, as the subsequent iput()
4342 * will try to delete it.
4344 journal_inode
= ext4_iget(sb
, journal_inum
);
4345 if (IS_ERR(journal_inode
)) {
4346 ext4_msg(sb
, KERN_ERR
, "no journal found");
4349 if (!journal_inode
->i_nlink
) {
4350 make_bad_inode(journal_inode
);
4351 iput(journal_inode
);
4352 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
4356 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4357 journal_inode
, journal_inode
->i_size
);
4358 if (!S_ISREG(journal_inode
->i_mode
)) {
4359 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
4360 iput(journal_inode
);
4363 return journal_inode
;
4366 static journal_t
*ext4_get_journal(struct super_block
*sb
,
4367 unsigned int journal_inum
)
4369 struct inode
*journal_inode
;
4372 BUG_ON(!ext4_has_feature_journal(sb
));
4374 journal_inode
= ext4_get_journal_inode(sb
, journal_inum
);
4378 journal
= jbd2_journal_init_inode(journal_inode
);
4380 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
4381 iput(journal_inode
);
4384 journal
->j_private
= sb
;
4385 ext4_init_journal_params(sb
, journal
);
4389 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
4392 struct buffer_head
*bh
;
4396 int hblock
, blocksize
;
4397 ext4_fsblk_t sb_block
;
4398 unsigned long offset
;
4399 struct ext4_super_block
*es
;
4400 struct block_device
*bdev
;
4402 BUG_ON(!ext4_has_feature_journal(sb
));
4404 bdev
= ext4_blkdev_get(j_dev
, sb
);
4408 blocksize
= sb
->s_blocksize
;
4409 hblock
= bdev_logical_block_size(bdev
);
4410 if (blocksize
< hblock
) {
4411 ext4_msg(sb
, KERN_ERR
,
4412 "blocksize too small for journal device");
4416 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
4417 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
4418 set_blocksize(bdev
, blocksize
);
4419 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
4420 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
4421 "external journal");
4425 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
4426 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
4427 !(le32_to_cpu(es
->s_feature_incompat
) &
4428 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
4429 ext4_msg(sb
, KERN_ERR
, "external journal has "
4435 if ((le32_to_cpu(es
->s_feature_ro_compat
) &
4436 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
) &&
4437 es
->s_checksum
!= ext4_superblock_csum(sb
, es
)) {
4438 ext4_msg(sb
, KERN_ERR
, "external journal has "
4439 "corrupt superblock");
4444 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
4445 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
4450 len
= ext4_blocks_count(es
);
4451 start
= sb_block
+ 1;
4452 brelse(bh
); /* we're done with the superblock */
4454 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
4455 start
, len
, blocksize
);
4457 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
4460 journal
->j_private
= sb
;
4461 ll_rw_block(REQ_OP_READ
, REQ_META
| REQ_PRIO
, 1, &journal
->j_sb_buffer
);
4462 wait_on_buffer(journal
->j_sb_buffer
);
4463 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
4464 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
4467 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
4468 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
4469 "user (unsupported) - %d",
4470 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
4473 EXT4_SB(sb
)->journal_bdev
= bdev
;
4474 ext4_init_journal_params(sb
, journal
);
4478 jbd2_journal_destroy(journal
);
4480 ext4_blkdev_put(bdev
);
4484 static int ext4_load_journal(struct super_block
*sb
,
4485 struct ext4_super_block
*es
,
4486 unsigned long journal_devnum
)
4489 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
4492 int really_read_only
;
4494 BUG_ON(!ext4_has_feature_journal(sb
));
4496 if (journal_devnum
&&
4497 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4498 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
4499 "numbers have changed");
4500 journal_dev
= new_decode_dev(journal_devnum
);
4502 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
4504 really_read_only
= bdev_read_only(sb
->s_bdev
);
4507 * Are we loading a blank journal or performing recovery after a
4508 * crash? For recovery, we need to check in advance whether we
4509 * can get read-write access to the device.
4511 if (ext4_has_feature_journal_needs_recovery(sb
)) {
4512 if (sb
->s_flags
& MS_RDONLY
) {
4513 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
4514 "required on readonly filesystem");
4515 if (really_read_only
) {
4516 ext4_msg(sb
, KERN_ERR
, "write access "
4517 "unavailable, cannot proceed");
4520 ext4_msg(sb
, KERN_INFO
, "write access will "
4521 "be enabled during recovery");
4525 if (journal_inum
&& journal_dev
) {
4526 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
4527 "and inode journals!");
4532 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
4535 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
4539 if (!(journal
->j_flags
& JBD2_BARRIER
))
4540 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
4542 if (!ext4_has_feature_journal_needs_recovery(sb
))
4543 err
= jbd2_journal_wipe(journal
, !really_read_only
);
4545 char *save
= kmalloc(EXT4_S_ERR_LEN
, GFP_KERNEL
);
4547 memcpy(save
, ((char *) es
) +
4548 EXT4_S_ERR_START
, EXT4_S_ERR_LEN
);
4549 err
= jbd2_journal_load(journal
);
4551 memcpy(((char *) es
) + EXT4_S_ERR_START
,
4552 save
, EXT4_S_ERR_LEN
);
4557 ext4_msg(sb
, KERN_ERR
, "error loading journal");
4558 jbd2_journal_destroy(journal
);
4562 EXT4_SB(sb
)->s_journal
= journal
;
4563 ext4_clear_journal_err(sb
, es
);
4565 if (!really_read_only
&& journal_devnum
&&
4566 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4567 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
4569 /* Make sure we flush the recovery flag to disk. */
4570 ext4_commit_super(sb
, 1);
4576 static int ext4_commit_super(struct super_block
*sb
, int sync
)
4578 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
4579 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
4582 if (!sbh
|| block_device_ejected(sb
))
4585 * If the file system is mounted read-only, don't update the
4586 * superblock write time. This avoids updating the superblock
4587 * write time when we are mounting the root file system
4588 * read/only but we need to replay the journal; at that point,
4589 * for people who are east of GMT and who make their clock
4590 * tick in localtime for Windows bug-for-bug compatibility,
4591 * the clock is set in the future, and this will cause e2fsck
4592 * to complain and force a full file system check.
4594 if (!(sb
->s_flags
& MS_RDONLY
))
4595 es
->s_wtime
= cpu_to_le32(get_seconds());
4596 if (sb
->s_bdev
->bd_part
)
4597 es
->s_kbytes_written
=
4598 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
4599 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
4600 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
4602 es
->s_kbytes_written
=
4603 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
);
4604 if (percpu_counter_initialized(&EXT4_SB(sb
)->s_freeclusters_counter
))
4605 ext4_free_blocks_count_set(es
,
4606 EXT4_C2B(EXT4_SB(sb
), percpu_counter_sum_positive(
4607 &EXT4_SB(sb
)->s_freeclusters_counter
)));
4608 if (percpu_counter_initialized(&EXT4_SB(sb
)->s_freeinodes_counter
))
4609 es
->s_free_inodes_count
=
4610 cpu_to_le32(percpu_counter_sum_positive(
4611 &EXT4_SB(sb
)->s_freeinodes_counter
));
4612 BUFFER_TRACE(sbh
, "marking dirty");
4613 ext4_superblock_csum_set(sb
);
4616 if (buffer_write_io_error(sbh
)) {
4618 * Oh, dear. A previous attempt to write the
4619 * superblock failed. This could happen because the
4620 * USB device was yanked out. Or it could happen to
4621 * be a transient write error and maybe the block will
4622 * be remapped. Nothing we can do but to retry the
4623 * write and hope for the best.
4625 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
4626 "superblock detected");
4627 clear_buffer_write_io_error(sbh
);
4628 set_buffer_uptodate(sbh
);
4630 mark_buffer_dirty(sbh
);
4633 error
= __sync_dirty_buffer(sbh
,
4634 test_opt(sb
, BARRIER
) ? REQ_FUA
: REQ_SYNC
);
4638 error
= buffer_write_io_error(sbh
);
4640 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
4642 clear_buffer_write_io_error(sbh
);
4643 set_buffer_uptodate(sbh
);
4650 * Have we just finished recovery? If so, and if we are mounting (or
4651 * remounting) the filesystem readonly, then we will end up with a
4652 * consistent fs on disk. Record that fact.
4654 static void ext4_mark_recovery_complete(struct super_block
*sb
,
4655 struct ext4_super_block
*es
)
4657 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
4659 if (!ext4_has_feature_journal(sb
)) {
4660 BUG_ON(journal
!= NULL
);
4663 jbd2_journal_lock_updates(journal
);
4664 if (jbd2_journal_flush(journal
) < 0)
4667 if (ext4_has_feature_journal_needs_recovery(sb
) &&
4668 sb
->s_flags
& MS_RDONLY
) {
4669 ext4_clear_feature_journal_needs_recovery(sb
);
4670 ext4_commit_super(sb
, 1);
4674 jbd2_journal_unlock_updates(journal
);
4678 * If we are mounting (or read-write remounting) a filesystem whose journal
4679 * has recorded an error from a previous lifetime, move that error to the
4680 * main filesystem now.
4682 static void ext4_clear_journal_err(struct super_block
*sb
,
4683 struct ext4_super_block
*es
)
4689 BUG_ON(!ext4_has_feature_journal(sb
));
4691 journal
= EXT4_SB(sb
)->s_journal
;
4694 * Now check for any error status which may have been recorded in the
4695 * journal by a prior ext4_error() or ext4_abort()
4698 j_errno
= jbd2_journal_errno(journal
);
4702 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
4703 ext4_warning(sb
, "Filesystem error recorded "
4704 "from previous mount: %s", errstr
);
4705 ext4_warning(sb
, "Marking fs in need of filesystem check.");
4707 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
4708 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
4709 ext4_commit_super(sb
, 1);
4711 jbd2_journal_clear_err(journal
);
4712 jbd2_journal_update_sb_errno(journal
);
4717 * Force the running and committing transactions to commit,
4718 * and wait on the commit.
4720 int ext4_force_commit(struct super_block
*sb
)
4724 if (sb
->s_flags
& MS_RDONLY
)
4727 journal
= EXT4_SB(sb
)->s_journal
;
4728 return ext4_journal_force_commit(journal
);
4731 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
4735 bool needs_barrier
= false;
4736 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4738 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
4741 trace_ext4_sync_fs(sb
, wait
);
4742 flush_workqueue(sbi
->rsv_conversion_wq
);
4744 * Writeback quota in non-journalled quota case - journalled quota has
4747 dquot_writeback_dquots(sb
, -1);
4749 * Data writeback is possible w/o journal transaction, so barrier must
4750 * being sent at the end of the function. But we can skip it if
4751 * transaction_commit will do it for us.
4753 if (sbi
->s_journal
) {
4754 target
= jbd2_get_latest_transaction(sbi
->s_journal
);
4755 if (wait
&& sbi
->s_journal
->j_flags
& JBD2_BARRIER
&&
4756 !jbd2_trans_will_send_data_barrier(sbi
->s_journal
, target
))
4757 needs_barrier
= true;
4759 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
4761 ret
= jbd2_log_wait_commit(sbi
->s_journal
,
4764 } else if (wait
&& test_opt(sb
, BARRIER
))
4765 needs_barrier
= true;
4766 if (needs_barrier
) {
4768 err
= blkdev_issue_flush(sb
->s_bdev
, GFP_KERNEL
, NULL
);
4777 * LVM calls this function before a (read-only) snapshot is created. This
4778 * gives us a chance to flush the journal completely and mark the fs clean.
4780 * Note that only this function cannot bring a filesystem to be in a clean
4781 * state independently. It relies on upper layer to stop all data & metadata
4784 static int ext4_freeze(struct super_block
*sb
)
4789 if (sb
->s_flags
& MS_RDONLY
)
4792 journal
= EXT4_SB(sb
)->s_journal
;
4795 /* Now we set up the journal barrier. */
4796 jbd2_journal_lock_updates(journal
);
4799 * Don't clear the needs_recovery flag if we failed to
4800 * flush the journal.
4802 error
= jbd2_journal_flush(journal
);
4806 /* Journal blocked and flushed, clear needs_recovery flag. */
4807 ext4_clear_feature_journal_needs_recovery(sb
);
4810 error
= ext4_commit_super(sb
, 1);
4813 /* we rely on upper layer to stop further updates */
4814 jbd2_journal_unlock_updates(journal
);
4819 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4820 * flag here, even though the filesystem is not technically dirty yet.
4822 static int ext4_unfreeze(struct super_block
*sb
)
4824 if ((sb
->s_flags
& MS_RDONLY
) || ext4_forced_shutdown(EXT4_SB(sb
)))
4827 if (EXT4_SB(sb
)->s_journal
) {
4828 /* Reset the needs_recovery flag before the fs is unlocked. */
4829 ext4_set_feature_journal_needs_recovery(sb
);
4832 ext4_commit_super(sb
, 1);
4837 * Structure to save mount options for ext4_remount's benefit
4839 struct ext4_mount_options
{
4840 unsigned long s_mount_opt
;
4841 unsigned long s_mount_opt2
;
4844 unsigned long s_commit_interval
;
4845 u32 s_min_batch_time
, s_max_batch_time
;
4848 char *s_qf_names
[EXT4_MAXQUOTAS
];
4852 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
4854 struct ext4_super_block
*es
;
4855 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4856 unsigned long old_sb_flags
;
4857 struct ext4_mount_options old_opts
;
4858 int enable_quota
= 0;
4860 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
4865 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
4867 /* Store the original options */
4868 old_sb_flags
= sb
->s_flags
;
4869 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
4870 old_opts
.s_mount_opt2
= sbi
->s_mount_opt2
;
4871 old_opts
.s_resuid
= sbi
->s_resuid
;
4872 old_opts
.s_resgid
= sbi
->s_resgid
;
4873 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
4874 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
4875 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
4877 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
4878 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
4879 if (sbi
->s_qf_names
[i
]) {
4880 old_opts
.s_qf_names
[i
] = kstrdup(sbi
->s_qf_names
[i
],
4882 if (!old_opts
.s_qf_names
[i
]) {
4883 for (j
= 0; j
< i
; j
++)
4884 kfree(old_opts
.s_qf_names
[j
]);
4889 old_opts
.s_qf_names
[i
] = NULL
;
4891 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
4892 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
4894 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
, 1)) {
4899 if ((old_opts
.s_mount_opt
& EXT4_MOUNT_JOURNAL_CHECKSUM
) ^
4900 test_opt(sb
, JOURNAL_CHECKSUM
)) {
4901 ext4_msg(sb
, KERN_ERR
, "changing journal_checksum "
4902 "during remount not supported; ignoring");
4903 sbi
->s_mount_opt
^= EXT4_MOUNT_JOURNAL_CHECKSUM
;
4906 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
4907 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
4908 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4909 "both data=journal and delalloc");
4913 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
4914 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4915 "both data=journal and dioread_nolock");
4919 if (test_opt(sb
, DAX
)) {
4920 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4921 "both data=journal and dax");
4925 } else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
) {
4926 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
4927 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4928 "journal_async_commit in data=ordered mode");
4934 if ((sbi
->s_mount_opt
^ old_opts
.s_mount_opt
) & EXT4_MOUNT_DAX
) {
4935 ext4_msg(sb
, KERN_WARNING
, "warning: refusing change of "
4936 "dax flag with busy inodes while remounting");
4937 sbi
->s_mount_opt
^= EXT4_MOUNT_DAX
;
4940 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
4941 ext4_abort(sb
, "Abort forced by user");
4943 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
4944 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
4948 if (sbi
->s_journal
) {
4949 ext4_init_journal_params(sb
, sbi
->s_journal
);
4950 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
4953 if (*flags
& MS_LAZYTIME
)
4954 sb
->s_flags
|= MS_LAZYTIME
;
4956 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
)) {
4957 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
4962 if (*flags
& MS_RDONLY
) {
4963 err
= sync_filesystem(sb
);
4966 err
= dquot_suspend(sb
, -1);
4971 * First of all, the unconditional stuff we have to do
4972 * to disable replay of the journal when we next remount
4974 sb
->s_flags
|= MS_RDONLY
;
4977 * OK, test if we are remounting a valid rw partition
4978 * readonly, and if so set the rdonly flag and then
4979 * mark the partition as valid again.
4981 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
4982 (sbi
->s_mount_state
& EXT4_VALID_FS
))
4983 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
4986 ext4_mark_recovery_complete(sb
, es
);
4988 /* Make sure we can mount this feature set readwrite */
4989 if (ext4_has_feature_readonly(sb
) ||
4990 !ext4_feature_set_ok(sb
, 0)) {
4995 * Make sure the group descriptor checksums
4996 * are sane. If they aren't, refuse to remount r/w.
4998 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
4999 struct ext4_group_desc
*gdp
=
5000 ext4_get_group_desc(sb
, g
, NULL
);
5002 if (!ext4_group_desc_csum_verify(sb
, g
, gdp
)) {
5003 ext4_msg(sb
, KERN_ERR
,
5004 "ext4_remount: Checksum for group %u failed (%u!=%u)",
5005 g
, le16_to_cpu(ext4_group_desc_csum(sb
, g
, gdp
)),
5006 le16_to_cpu(gdp
->bg_checksum
));
5013 * If we have an unprocessed orphan list hanging
5014 * around from a previously readonly bdev mount,
5015 * require a full umount/remount for now.
5017 if (es
->s_last_orphan
) {
5018 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
5019 "remount RDWR because of unprocessed "
5020 "orphan inode list. Please "
5021 "umount/remount instead");
5027 * Mounting a RDONLY partition read-write, so reread
5028 * and store the current valid flag. (It may have
5029 * been changed by e2fsck since we originally mounted
5033 ext4_clear_journal_err(sb
, es
);
5034 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
5035 if (!ext4_setup_super(sb
, es
, 0))
5036 sb
->s_flags
&= ~MS_RDONLY
;
5037 if (ext4_has_feature_mmp(sb
))
5038 if (ext4_multi_mount_protect(sb
,
5039 le64_to_cpu(es
->s_mmp_block
))) {
5048 * Reinitialize lazy itable initialization thread based on
5051 if ((sb
->s_flags
& MS_RDONLY
) || !test_opt(sb
, INIT_INODE_TABLE
))
5052 ext4_unregister_li_request(sb
);
5054 ext4_group_t first_not_zeroed
;
5055 first_not_zeroed
= ext4_has_uninit_itable(sb
);
5056 ext4_register_li_request(sb
, first_not_zeroed
);
5059 ext4_setup_system_zone(sb
);
5060 if (sbi
->s_journal
== NULL
&& !(old_sb_flags
& MS_RDONLY
))
5061 ext4_commit_super(sb
, 1);
5064 /* Release old quota file names */
5065 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
5066 kfree(old_opts
.s_qf_names
[i
]);
5068 if (sb_any_quota_suspended(sb
))
5069 dquot_resume(sb
, -1);
5070 else if (ext4_has_feature_quota(sb
)) {
5071 err
= ext4_enable_quotas(sb
);
5078 *flags
= (*flags
& ~MS_LAZYTIME
) | (sb
->s_flags
& MS_LAZYTIME
);
5079 ext4_msg(sb
, KERN_INFO
, "re-mounted. Opts: %s", orig_data
);
5084 sb
->s_flags
= old_sb_flags
;
5085 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
5086 sbi
->s_mount_opt2
= old_opts
.s_mount_opt2
;
5087 sbi
->s_resuid
= old_opts
.s_resuid
;
5088 sbi
->s_resgid
= old_opts
.s_resgid
;
5089 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
5090 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
5091 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
5093 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
5094 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++) {
5095 kfree(sbi
->s_qf_names
[i
]);
5096 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
5104 static int ext4_statfs_project(struct super_block
*sb
,
5105 kprojid_t projid
, struct kstatfs
*buf
)
5108 struct dquot
*dquot
;
5112 qid
= make_kqid_projid(projid
);
5113 dquot
= dqget(sb
, qid
);
5115 return PTR_ERR(dquot
);
5116 spin_lock(&dq_data_lock
);
5118 limit
= (dquot
->dq_dqb
.dqb_bsoftlimit
?
5119 dquot
->dq_dqb
.dqb_bsoftlimit
:
5120 dquot
->dq_dqb
.dqb_bhardlimit
) >> sb
->s_blocksize_bits
;
5121 if (limit
&& buf
->f_blocks
> limit
) {
5122 curblock
= dquot
->dq_dqb
.dqb_curspace
>> sb
->s_blocksize_bits
;
5123 buf
->f_blocks
= limit
;
5124 buf
->f_bfree
= buf
->f_bavail
=
5125 (buf
->f_blocks
> curblock
) ?
5126 (buf
->f_blocks
- curblock
) : 0;
5129 limit
= dquot
->dq_dqb
.dqb_isoftlimit
?
5130 dquot
->dq_dqb
.dqb_isoftlimit
:
5131 dquot
->dq_dqb
.dqb_ihardlimit
;
5132 if (limit
&& buf
->f_files
> limit
) {
5133 buf
->f_files
= limit
;
5135 (buf
->f_files
> dquot
->dq_dqb
.dqb_curinodes
) ?
5136 (buf
->f_files
- dquot
->dq_dqb
.dqb_curinodes
) : 0;
5139 spin_unlock(&dq_data_lock
);
5145 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
5147 struct super_block
*sb
= dentry
->d_sb
;
5148 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
5149 struct ext4_super_block
*es
= sbi
->s_es
;
5150 ext4_fsblk_t overhead
= 0, resv_blocks
;
5153 resv_blocks
= EXT4_C2B(sbi
, atomic64_read(&sbi
->s_resv_clusters
));
5155 if (!test_opt(sb
, MINIX_DF
))
5156 overhead
= sbi
->s_overhead
;
5158 buf
->f_type
= EXT4_SUPER_MAGIC
;
5159 buf
->f_bsize
= sb
->s_blocksize
;
5160 buf
->f_blocks
= ext4_blocks_count(es
) - EXT4_C2B(sbi
, overhead
);
5161 bfree
= percpu_counter_sum_positive(&sbi
->s_freeclusters_counter
) -
5162 percpu_counter_sum_positive(&sbi
->s_dirtyclusters_counter
);
5163 /* prevent underflow in case that few free space is available */
5164 buf
->f_bfree
= EXT4_C2B(sbi
, max_t(s64
, bfree
, 0));
5165 buf
->f_bavail
= buf
->f_bfree
-
5166 (ext4_r_blocks_count(es
) + resv_blocks
);
5167 if (buf
->f_bfree
< (ext4_r_blocks_count(es
) + resv_blocks
))
5169 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
5170 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
5171 buf
->f_namelen
= EXT4_NAME_LEN
;
5172 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
5173 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
5174 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
5175 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
5178 if (ext4_test_inode_flag(dentry
->d_inode
, EXT4_INODE_PROJINHERIT
) &&
5179 sb_has_quota_limits_enabled(sb
, PRJQUOTA
))
5180 ext4_statfs_project(sb
, EXT4_I(dentry
->d_inode
)->i_projid
, buf
);
5185 /* Helper function for writing quotas on sync - we need to start transaction
5186 * before quota file is locked for write. Otherwise the are possible deadlocks:
5187 * Process 1 Process 2
5188 * ext4_create() quota_sync()
5189 * jbd2_journal_start() write_dquot()
5190 * dquot_initialize() down(dqio_mutex)
5191 * down(dqio_mutex) jbd2_journal_start()
5197 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
5199 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_id
.type
];
5202 static int ext4_write_dquot(struct dquot
*dquot
)
5206 struct inode
*inode
;
5208 inode
= dquot_to_inode(dquot
);
5209 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
,
5210 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
5212 return PTR_ERR(handle
);
5213 ret
= dquot_commit(dquot
);
5214 err
= ext4_journal_stop(handle
);
5220 static int ext4_acquire_dquot(struct dquot
*dquot
)
5225 handle
= ext4_journal_start(dquot_to_inode(dquot
), EXT4_HT_QUOTA
,
5226 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
5228 return PTR_ERR(handle
);
5229 ret
= dquot_acquire(dquot
);
5230 err
= ext4_journal_stop(handle
);
5236 static int ext4_release_dquot(struct dquot
*dquot
)
5241 handle
= ext4_journal_start(dquot_to_inode(dquot
), EXT4_HT_QUOTA
,
5242 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
5243 if (IS_ERR(handle
)) {
5244 /* Release dquot anyway to avoid endless cycle in dqput() */
5245 dquot_release(dquot
);
5246 return PTR_ERR(handle
);
5248 ret
= dquot_release(dquot
);
5249 err
= ext4_journal_stop(handle
);
5255 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
5257 struct super_block
*sb
= dquot
->dq_sb
;
5258 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
5260 /* Are we journaling quotas? */
5261 if (ext4_has_feature_quota(sb
) ||
5262 sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
5263 dquot_mark_dquot_dirty(dquot
);
5264 return ext4_write_dquot(dquot
);
5266 return dquot_mark_dquot_dirty(dquot
);
5270 static int ext4_write_info(struct super_block
*sb
, int type
)
5275 /* Data block + inode block */
5276 handle
= ext4_journal_start(d_inode(sb
->s_root
), EXT4_HT_QUOTA
, 2);
5278 return PTR_ERR(handle
);
5279 ret
= dquot_commit_info(sb
, type
);
5280 err
= ext4_journal_stop(handle
);
5287 * Turn on quotas during mount time - we need to find
5288 * the quota file and such...
5290 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
5292 return dquot_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
5293 EXT4_SB(sb
)->s_jquota_fmt
, type
);
5296 static void lockdep_set_quota_inode(struct inode
*inode
, int subclass
)
5298 struct ext4_inode_info
*ei
= EXT4_I(inode
);
5300 /* The first argument of lockdep_set_subclass has to be
5301 * *exactly* the same as the argument to init_rwsem() --- in
5302 * this case, in init_once() --- or lockdep gets unhappy
5303 * because the name of the lock is set using the
5304 * stringification of the argument to init_rwsem().
5306 (void) ei
; /* shut up clang warning if !CONFIG_LOCKDEP */
5307 lockdep_set_subclass(&ei
->i_data_sem
, subclass
);
5311 * Standard function to be called on quota_on
5313 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
5314 const struct path
*path
)
5318 if (!test_opt(sb
, QUOTA
))
5321 /* Quotafile not on the same filesystem? */
5322 if (path
->dentry
->d_sb
!= sb
)
5324 /* Journaling quota? */
5325 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
5326 /* Quotafile not in fs root? */
5327 if (path
->dentry
->d_parent
!= sb
->s_root
)
5328 ext4_msg(sb
, KERN_WARNING
,
5329 "Quota file not on filesystem root. "
5330 "Journaled quota will not work");
5334 * When we journal data on quota file, we have to flush journal to see
5335 * all updates to the file when we bypass pagecache...
5337 if (EXT4_SB(sb
)->s_journal
&&
5338 ext4_should_journal_data(d_inode(path
->dentry
))) {
5340 * We don't need to lock updates but journal_flush() could
5341 * otherwise be livelocked...
5343 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
5344 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
5345 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
5349 lockdep_set_quota_inode(path
->dentry
->d_inode
, I_DATA_SEM_QUOTA
);
5350 err
= dquot_quota_on(sb
, type
, format_id
, path
);
5352 lockdep_set_quota_inode(path
->dentry
->d_inode
,
5357 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
5361 struct inode
*qf_inode
;
5362 unsigned long qf_inums
[EXT4_MAXQUOTAS
] = {
5363 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
5364 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
),
5365 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_prj_quota_inum
)
5368 BUG_ON(!ext4_has_feature_quota(sb
));
5370 if (!qf_inums
[type
])
5373 qf_inode
= ext4_iget(sb
, qf_inums
[type
]);
5374 if (IS_ERR(qf_inode
)) {
5375 ext4_error(sb
, "Bad quota inode # %lu", qf_inums
[type
]);
5376 return PTR_ERR(qf_inode
);
5379 /* Don't account quota for quota files to avoid recursion */
5380 qf_inode
->i_flags
|= S_NOQUOTA
;
5381 lockdep_set_quota_inode(qf_inode
, I_DATA_SEM_QUOTA
);
5382 err
= dquot_enable(qf_inode
, type
, format_id
, flags
);
5385 lockdep_set_quota_inode(qf_inode
, I_DATA_SEM_NORMAL
);
5390 /* Enable usage tracking for all quota types. */
5391 static int ext4_enable_quotas(struct super_block
*sb
)
5394 unsigned long qf_inums
[EXT4_MAXQUOTAS
] = {
5395 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
5396 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
),
5397 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_prj_quota_inum
)
5399 bool quota_mopt
[EXT4_MAXQUOTAS
] = {
5400 test_opt(sb
, USRQUOTA
),
5401 test_opt(sb
, GRPQUOTA
),
5402 test_opt(sb
, PRJQUOTA
),
5405 sb_dqopt(sb
)->flags
|= DQUOT_QUOTA_SYS_FILE
;
5406 for (type
= 0; type
< EXT4_MAXQUOTAS
; type
++) {
5407 if (qf_inums
[type
]) {
5408 err
= ext4_quota_enable(sb
, type
, QFMT_VFS_V1
,
5409 DQUOT_USAGE_ENABLED
|
5410 (quota_mopt
[type
] ? DQUOT_LIMITS_ENABLED
: 0));
5413 "Failed to enable quota tracking "
5414 "(type=%d, err=%d). Please run "
5415 "e2fsck to fix.", type
, err
);
5423 static int ext4_quota_off(struct super_block
*sb
, int type
)
5425 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5428 /* Force all delayed allocation blocks to be allocated.
5429 * Caller already holds s_umount sem */
5430 if (test_opt(sb
, DELALLOC
))
5431 sync_filesystem(sb
);
5436 /* Update modification times of quota files when userspace can
5437 * start looking at them */
5438 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
, 1);
5441 inode
->i_mtime
= inode
->i_ctime
= current_time(inode
);
5442 ext4_mark_inode_dirty(handle
, inode
);
5443 ext4_journal_stop(handle
);
5446 return dquot_quota_off(sb
, type
);
5449 /* Read data from quotafile - avoid pagecache and such because we cannot afford
5450 * acquiring the locks... As quota files are never truncated and quota code
5451 * itself serializes the operations (and no one else should touch the files)
5452 * we don't have to be afraid of races */
5453 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
5454 size_t len
, loff_t off
)
5456 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5457 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5458 int offset
= off
& (sb
->s_blocksize
- 1);
5461 struct buffer_head
*bh
;
5462 loff_t i_size
= i_size_read(inode
);
5466 if (off
+len
> i_size
)
5469 while (toread
> 0) {
5470 tocopy
= sb
->s_blocksize
- offset
< toread
?
5471 sb
->s_blocksize
- offset
: toread
;
5472 bh
= ext4_bread(NULL
, inode
, blk
, 0);
5475 if (!bh
) /* A hole? */
5476 memset(data
, 0, tocopy
);
5478 memcpy(data
, bh
->b_data
+offset
, tocopy
);
5488 /* Write to quotafile (we know the transaction is already started and has
5489 * enough credits) */
5490 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
5491 const char *data
, size_t len
, loff_t off
)
5493 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5494 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5495 int err
, offset
= off
& (sb
->s_blocksize
- 1);
5497 struct buffer_head
*bh
;
5498 handle_t
*handle
= journal_current_handle();
5500 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
5501 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5502 " cancelled because transaction is not started",
5503 (unsigned long long)off
, (unsigned long long)len
);
5507 * Since we account only one data block in transaction credits,
5508 * then it is impossible to cross a block boundary.
5510 if (sb
->s_blocksize
- offset
< len
) {
5511 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5512 " cancelled because not block aligned",
5513 (unsigned long long)off
, (unsigned long long)len
);
5518 bh
= ext4_bread(handle
, inode
, blk
,
5519 EXT4_GET_BLOCKS_CREATE
|
5520 EXT4_GET_BLOCKS_METADATA_NOFAIL
);
5521 } while (IS_ERR(bh
) && (PTR_ERR(bh
) == -ENOSPC
) &&
5522 ext4_should_retry_alloc(inode
->i_sb
, &retries
));
5527 BUFFER_TRACE(bh
, "get write access");
5528 err
= ext4_journal_get_write_access(handle
, bh
);
5534 memcpy(bh
->b_data
+offset
, data
, len
);
5535 flush_dcache_page(bh
->b_page
);
5537 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
5540 if (inode
->i_size
< off
+ len
) {
5541 i_size_write(inode
, off
+ len
);
5542 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
5543 ext4_mark_inode_dirty(handle
, inode
);
5548 static int ext4_get_next_id(struct super_block
*sb
, struct kqid
*qid
)
5550 const struct quota_format_ops
*ops
;
5552 if (!sb_has_quota_loaded(sb
, qid
->type
))
5554 ops
= sb_dqopt(sb
)->ops
[qid
->type
];
5555 if (!ops
|| !ops
->get_next_id
)
5557 return dquot_get_next_id(sb
, qid
);
5561 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
5562 const char *dev_name
, void *data
)
5564 return mount_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
);
5567 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
5568 static inline void register_as_ext2(void)
5570 int err
= register_filesystem(&ext2_fs_type
);
5573 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
5576 static inline void unregister_as_ext2(void)
5578 unregister_filesystem(&ext2_fs_type
);
5581 static inline int ext2_feature_set_ok(struct super_block
*sb
)
5583 if (ext4_has_unknown_ext2_incompat_features(sb
))
5585 if (sb
->s_flags
& MS_RDONLY
)
5587 if (ext4_has_unknown_ext2_ro_compat_features(sb
))
5592 static inline void register_as_ext2(void) { }
5593 static inline void unregister_as_ext2(void) { }
5594 static inline int ext2_feature_set_ok(struct super_block
*sb
) { return 0; }
5597 static inline void register_as_ext3(void)
5599 int err
= register_filesystem(&ext3_fs_type
);
5602 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
5605 static inline void unregister_as_ext3(void)
5607 unregister_filesystem(&ext3_fs_type
);
5610 static inline int ext3_feature_set_ok(struct super_block
*sb
)
5612 if (ext4_has_unknown_ext3_incompat_features(sb
))
5614 if (!ext4_has_feature_journal(sb
))
5616 if (sb
->s_flags
& MS_RDONLY
)
5618 if (ext4_has_unknown_ext3_ro_compat_features(sb
))
5623 static struct file_system_type ext4_fs_type
= {
5624 .owner
= THIS_MODULE
,
5626 .mount
= ext4_mount
,
5627 .kill_sb
= kill_block_super
,
5628 .fs_flags
= FS_REQUIRES_DEV
,
5630 MODULE_ALIAS_FS("ext4");
5632 /* Shared across all ext4 file systems */
5633 wait_queue_head_t ext4__ioend_wq
[EXT4_WQ_HASH_SZ
];
5635 static int __init
ext4_init_fs(void)
5639 ratelimit_state_init(&ext4_mount_msg_ratelimit
, 30 * HZ
, 64);
5640 ext4_li_info
= NULL
;
5641 mutex_init(&ext4_li_mtx
);
5643 /* Build-time check for flags consistency */
5644 ext4_check_flag_values();
5646 for (i
= 0; i
< EXT4_WQ_HASH_SZ
; i
++)
5647 init_waitqueue_head(&ext4__ioend_wq
[i
]);
5649 err
= ext4_init_es();
5653 err
= ext4_init_pageio();
5657 err
= ext4_init_system_zone();
5661 err
= ext4_init_sysfs();
5665 err
= ext4_init_mballoc();
5668 err
= init_inodecache();
5673 err
= register_filesystem(&ext4_fs_type
);
5679 unregister_as_ext2();
5680 unregister_as_ext3();
5681 destroy_inodecache();
5683 ext4_exit_mballoc();
5687 ext4_exit_system_zone();
5696 static void __exit
ext4_exit_fs(void)
5698 ext4_destroy_lazyinit_thread();
5699 unregister_as_ext2();
5700 unregister_as_ext3();
5701 unregister_filesystem(&ext4_fs_type
);
5702 destroy_inodecache();
5703 ext4_exit_mballoc();
5705 ext4_exit_system_zone();
5710 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5711 MODULE_DESCRIPTION("Fourth Extended Filesystem");
5712 MODULE_LICENSE("GPL");
5713 module_init(ext4_init_fs
)
5714 module_exit(ext4_exit_fs
)