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 <asm/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);
85 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
86 * i_mmap_rwsem (inode->i_mmap_rwsem)!
89 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
90 * page lock -> i_data_sem (rw)
92 * buffered write path:
93 * sb_start_write -> i_mutex -> mmap_sem
94 * sb_start_write -> i_mutex -> transaction start -> page lock ->
98 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
99 * i_mmap_rwsem (w) -> page lock
100 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
101 * transaction start -> i_data_sem (rw)
104 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> mmap_sem
105 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) ->
106 * transaction start -> i_data_sem (rw)
109 * transaction start -> page lock(s) -> i_data_sem (rw)
112 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
113 static struct file_system_type ext2_fs_type
= {
114 .owner
= THIS_MODULE
,
117 .kill_sb
= kill_block_super
,
118 .fs_flags
= FS_REQUIRES_DEV
,
120 MODULE_ALIAS_FS("ext2");
121 MODULE_ALIAS("ext2");
122 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
124 #define IS_EXT2_SB(sb) (0)
128 static struct file_system_type ext3_fs_type
= {
129 .owner
= THIS_MODULE
,
132 .kill_sb
= kill_block_super
,
133 .fs_flags
= FS_REQUIRES_DEV
,
135 MODULE_ALIAS_FS("ext3");
136 MODULE_ALIAS("ext3");
137 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
139 static int ext4_verify_csum_type(struct super_block
*sb
,
140 struct ext4_super_block
*es
)
142 if (!ext4_has_feature_metadata_csum(sb
))
145 return es
->s_checksum_type
== EXT4_CRC32C_CHKSUM
;
148 static __le32
ext4_superblock_csum(struct super_block
*sb
,
149 struct ext4_super_block
*es
)
151 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
152 int offset
= offsetof(struct ext4_super_block
, s_checksum
);
155 csum
= ext4_chksum(sbi
, ~0, (char *)es
, offset
);
157 return cpu_to_le32(csum
);
160 static int ext4_superblock_csum_verify(struct super_block
*sb
,
161 struct ext4_super_block
*es
)
163 if (!ext4_has_metadata_csum(sb
))
166 return es
->s_checksum
== ext4_superblock_csum(sb
, es
);
169 void ext4_superblock_csum_set(struct super_block
*sb
)
171 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
173 if (!ext4_has_metadata_csum(sb
))
176 es
->s_checksum
= ext4_superblock_csum(sb
, es
);
179 void *ext4_kvmalloc(size_t size
, gfp_t flags
)
183 ret
= kmalloc(size
, flags
| __GFP_NOWARN
);
185 ret
= __vmalloc(size
, flags
, PAGE_KERNEL
);
189 void *ext4_kvzalloc(size_t size
, gfp_t flags
)
193 ret
= kzalloc(size
, flags
| __GFP_NOWARN
);
195 ret
= __vmalloc(size
, flags
| __GFP_ZERO
, PAGE_KERNEL
);
199 ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
200 struct ext4_group_desc
*bg
)
202 return le32_to_cpu(bg
->bg_block_bitmap_lo
) |
203 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
204 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
207 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
208 struct ext4_group_desc
*bg
)
210 return le32_to_cpu(bg
->bg_inode_bitmap_lo
) |
211 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
212 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
215 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
216 struct ext4_group_desc
*bg
)
218 return le32_to_cpu(bg
->bg_inode_table_lo
) |
219 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
220 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
223 __u32
ext4_free_group_clusters(struct super_block
*sb
,
224 struct ext4_group_desc
*bg
)
226 return le16_to_cpu(bg
->bg_free_blocks_count_lo
) |
227 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
228 (__u32
)le16_to_cpu(bg
->bg_free_blocks_count_hi
) << 16 : 0);
231 __u32
ext4_free_inodes_count(struct super_block
*sb
,
232 struct ext4_group_desc
*bg
)
234 return le16_to_cpu(bg
->bg_free_inodes_count_lo
) |
235 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
236 (__u32
)le16_to_cpu(bg
->bg_free_inodes_count_hi
) << 16 : 0);
239 __u32
ext4_used_dirs_count(struct super_block
*sb
,
240 struct ext4_group_desc
*bg
)
242 return le16_to_cpu(bg
->bg_used_dirs_count_lo
) |
243 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
244 (__u32
)le16_to_cpu(bg
->bg_used_dirs_count_hi
) << 16 : 0);
247 __u32
ext4_itable_unused_count(struct super_block
*sb
,
248 struct ext4_group_desc
*bg
)
250 return le16_to_cpu(bg
->bg_itable_unused_lo
) |
251 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
252 (__u32
)le16_to_cpu(bg
->bg_itable_unused_hi
) << 16 : 0);
255 void ext4_block_bitmap_set(struct super_block
*sb
,
256 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
258 bg
->bg_block_bitmap_lo
= cpu_to_le32((u32
)blk
);
259 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
260 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
263 void ext4_inode_bitmap_set(struct super_block
*sb
,
264 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
266 bg
->bg_inode_bitmap_lo
= cpu_to_le32((u32
)blk
);
267 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
268 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
271 void ext4_inode_table_set(struct super_block
*sb
,
272 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
274 bg
->bg_inode_table_lo
= cpu_to_le32((u32
)blk
);
275 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
276 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
279 void ext4_free_group_clusters_set(struct super_block
*sb
,
280 struct ext4_group_desc
*bg
, __u32 count
)
282 bg
->bg_free_blocks_count_lo
= cpu_to_le16((__u16
)count
);
283 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
284 bg
->bg_free_blocks_count_hi
= cpu_to_le16(count
>> 16);
287 void ext4_free_inodes_set(struct super_block
*sb
,
288 struct ext4_group_desc
*bg
, __u32 count
)
290 bg
->bg_free_inodes_count_lo
= cpu_to_le16((__u16
)count
);
291 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
292 bg
->bg_free_inodes_count_hi
= cpu_to_le16(count
>> 16);
295 void ext4_used_dirs_set(struct super_block
*sb
,
296 struct ext4_group_desc
*bg
, __u32 count
)
298 bg
->bg_used_dirs_count_lo
= cpu_to_le16((__u16
)count
);
299 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
300 bg
->bg_used_dirs_count_hi
= cpu_to_le16(count
>> 16);
303 void ext4_itable_unused_set(struct super_block
*sb
,
304 struct ext4_group_desc
*bg
, __u32 count
)
306 bg
->bg_itable_unused_lo
= cpu_to_le16((__u16
)count
);
307 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
308 bg
->bg_itable_unused_hi
= cpu_to_le16(count
>> 16);
312 static void __save_error_info(struct super_block
*sb
, const char *func
,
315 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
317 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
318 if (bdev_read_only(sb
->s_bdev
))
320 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
321 es
->s_last_error_time
= cpu_to_le32(get_seconds());
322 strncpy(es
->s_last_error_func
, func
, sizeof(es
->s_last_error_func
));
323 es
->s_last_error_line
= cpu_to_le32(line
);
324 if (!es
->s_first_error_time
) {
325 es
->s_first_error_time
= es
->s_last_error_time
;
326 strncpy(es
->s_first_error_func
, func
,
327 sizeof(es
->s_first_error_func
));
328 es
->s_first_error_line
= cpu_to_le32(line
);
329 es
->s_first_error_ino
= es
->s_last_error_ino
;
330 es
->s_first_error_block
= es
->s_last_error_block
;
333 * Start the daily error reporting function if it hasn't been
336 if (!es
->s_error_count
)
337 mod_timer(&EXT4_SB(sb
)->s_err_report
, jiffies
+ 24*60*60*HZ
);
338 le32_add_cpu(&es
->s_error_count
, 1);
341 static void save_error_info(struct super_block
*sb
, const char *func
,
344 __save_error_info(sb
, func
, line
);
345 ext4_commit_super(sb
, 1);
349 * The del_gendisk() function uninitializes the disk-specific data
350 * structures, including the bdi structure, without telling anyone
351 * else. Once this happens, any attempt to call mark_buffer_dirty()
352 * (for example, by ext4_commit_super), will cause a kernel OOPS.
353 * This is a kludge to prevent these oops until we can put in a proper
354 * hook in del_gendisk() to inform the VFS and file system layers.
356 static int block_device_ejected(struct super_block
*sb
)
358 struct inode
*bd_inode
= sb
->s_bdev
->bd_inode
;
359 struct backing_dev_info
*bdi
= inode_to_bdi(bd_inode
);
361 return bdi
->dev
== NULL
;
364 static void ext4_journal_commit_callback(journal_t
*journal
, transaction_t
*txn
)
366 struct super_block
*sb
= journal
->j_private
;
367 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
368 int error
= is_journal_aborted(journal
);
369 struct ext4_journal_cb_entry
*jce
;
371 BUG_ON(txn
->t_state
== T_FINISHED
);
372 spin_lock(&sbi
->s_md_lock
);
373 while (!list_empty(&txn
->t_private_list
)) {
374 jce
= list_entry(txn
->t_private_list
.next
,
375 struct ext4_journal_cb_entry
, jce_list
);
376 list_del_init(&jce
->jce_list
);
377 spin_unlock(&sbi
->s_md_lock
);
378 jce
->jce_func(sb
, jce
, error
);
379 spin_lock(&sbi
->s_md_lock
);
381 spin_unlock(&sbi
->s_md_lock
);
384 /* Deal with the reporting of failure conditions on a filesystem such as
385 * inconsistencies detected or read IO failures.
387 * On ext2, we can store the error state of the filesystem in the
388 * superblock. That is not possible on ext4, because we may have other
389 * write ordering constraints on the superblock which prevent us from
390 * writing it out straight away; and given that the journal is about to
391 * be aborted, we can't rely on the current, or future, transactions to
392 * write out the superblock safely.
394 * We'll just use the jbd2_journal_abort() error code to record an error in
395 * the journal instead. On recovery, the journal will complain about
396 * that error until we've noted it down and cleared it.
399 static void ext4_handle_error(struct super_block
*sb
)
401 if (sb
->s_flags
& MS_RDONLY
)
404 if (!test_opt(sb
, ERRORS_CONT
)) {
405 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
407 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
409 jbd2_journal_abort(journal
, -EIO
);
411 if (test_opt(sb
, ERRORS_RO
)) {
412 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
414 * Make sure updated value of ->s_mount_flags will be visible
415 * before ->s_flags update
418 sb
->s_flags
|= MS_RDONLY
;
420 if (test_opt(sb
, ERRORS_PANIC
)) {
421 if (EXT4_SB(sb
)->s_journal
&&
422 !(EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_REC_ERR
))
424 panic("EXT4-fs (device %s): panic forced after error\n",
429 #define ext4_error_ratelimit(sb) \
430 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
433 void __ext4_error(struct super_block
*sb
, const char *function
,
434 unsigned int line
, const char *fmt
, ...)
436 struct va_format vaf
;
439 if (ext4_error_ratelimit(sb
)) {
444 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
445 sb
->s_id
, function
, line
, current
->comm
, &vaf
);
448 save_error_info(sb
, function
, line
);
449 ext4_handle_error(sb
);
452 void __ext4_error_inode(struct inode
*inode
, const char *function
,
453 unsigned int line
, ext4_fsblk_t block
,
454 const char *fmt
, ...)
457 struct va_format vaf
;
458 struct ext4_super_block
*es
= EXT4_SB(inode
->i_sb
)->s_es
;
460 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
461 es
->s_last_error_block
= cpu_to_le64(block
);
462 if (ext4_error_ratelimit(inode
->i_sb
)) {
467 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
468 "inode #%lu: block %llu: comm %s: %pV\n",
469 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
470 block
, current
->comm
, &vaf
);
472 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
473 "inode #%lu: comm %s: %pV\n",
474 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
475 current
->comm
, &vaf
);
478 save_error_info(inode
->i_sb
, function
, line
);
479 ext4_handle_error(inode
->i_sb
);
482 void __ext4_error_file(struct file
*file
, const char *function
,
483 unsigned int line
, ext4_fsblk_t block
,
484 const char *fmt
, ...)
487 struct va_format vaf
;
488 struct ext4_super_block
*es
;
489 struct inode
*inode
= file_inode(file
);
490 char pathname
[80], *path
;
492 es
= EXT4_SB(inode
->i_sb
)->s_es
;
493 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
494 if (ext4_error_ratelimit(inode
->i_sb
)) {
495 path
= file_path(file
, pathname
, sizeof(pathname
));
503 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
504 "block %llu: comm %s: path %s: %pV\n",
505 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
506 block
, current
->comm
, path
, &vaf
);
509 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
510 "comm %s: path %s: %pV\n",
511 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
512 current
->comm
, path
, &vaf
);
515 save_error_info(inode
->i_sb
, function
, line
);
516 ext4_handle_error(inode
->i_sb
);
519 const char *ext4_decode_error(struct super_block
*sb
, int errno
,
526 errstr
= "Corrupt filesystem";
529 errstr
= "Filesystem failed CRC";
532 errstr
= "IO failure";
535 errstr
= "Out of memory";
538 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
539 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
540 errstr
= "Journal has aborted";
542 errstr
= "Readonly filesystem";
545 /* If the caller passed in an extra buffer for unknown
546 * errors, textualise them now. Else we just return
549 /* Check for truncated error codes... */
550 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
559 /* __ext4_std_error decodes expected errors from journaling functions
560 * automatically and invokes the appropriate error response. */
562 void __ext4_std_error(struct super_block
*sb
, const char *function
,
563 unsigned int line
, int errno
)
568 /* Special case: if the error is EROFS, and we're not already
569 * inside a transaction, then there's really no point in logging
571 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
572 (sb
->s_flags
& MS_RDONLY
))
575 if (ext4_error_ratelimit(sb
)) {
576 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
577 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s:%d: %s\n",
578 sb
->s_id
, function
, line
, errstr
);
581 save_error_info(sb
, function
, line
);
582 ext4_handle_error(sb
);
586 * ext4_abort is a much stronger failure handler than ext4_error. The
587 * abort function may be used to deal with unrecoverable failures such
588 * as journal IO errors or ENOMEM at a critical moment in log management.
590 * We unconditionally force the filesystem into an ABORT|READONLY state,
591 * unless the error response on the fs has been set to panic in which
592 * case we take the easy way out and panic immediately.
595 void __ext4_abort(struct super_block
*sb
, const char *function
,
596 unsigned int line
, const char *fmt
, ...)
600 save_error_info(sb
, function
, line
);
602 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: ", sb
->s_id
,
608 if ((sb
->s_flags
& MS_RDONLY
) == 0) {
609 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
610 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
612 * Make sure updated value of ->s_mount_flags will be visible
613 * before ->s_flags update
616 sb
->s_flags
|= MS_RDONLY
;
617 if (EXT4_SB(sb
)->s_journal
)
618 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
619 save_error_info(sb
, function
, line
);
621 if (test_opt(sb
, ERRORS_PANIC
)) {
622 if (EXT4_SB(sb
)->s_journal
&&
623 !(EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_REC_ERR
))
625 panic("EXT4-fs panic from previous error\n");
629 void __ext4_msg(struct super_block
*sb
,
630 const char *prefix
, const char *fmt
, ...)
632 struct va_format vaf
;
635 if (!___ratelimit(&(EXT4_SB(sb
)->s_msg_ratelimit_state
), "EXT4-fs"))
641 printk("%sEXT4-fs (%s): %pV\n", prefix
, sb
->s_id
, &vaf
);
645 #define ext4_warning_ratelimit(sb) \
646 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
649 void __ext4_warning(struct super_block
*sb
, const char *function
,
650 unsigned int line
, const char *fmt
, ...)
652 struct va_format vaf
;
655 if (!ext4_warning_ratelimit(sb
))
661 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: %pV\n",
662 sb
->s_id
, function
, line
, &vaf
);
666 void __ext4_warning_inode(const struct inode
*inode
, const char *function
,
667 unsigned int line
, const char *fmt
, ...)
669 struct va_format vaf
;
672 if (!ext4_warning_ratelimit(inode
->i_sb
))
678 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: "
679 "inode #%lu: comm %s: %pV\n", inode
->i_sb
->s_id
,
680 function
, line
, inode
->i_ino
, current
->comm
, &vaf
);
684 void __ext4_grp_locked_error(const char *function
, unsigned int line
,
685 struct super_block
*sb
, ext4_group_t grp
,
686 unsigned long ino
, ext4_fsblk_t block
,
687 const char *fmt
, ...)
691 struct va_format vaf
;
693 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
695 es
->s_last_error_ino
= cpu_to_le32(ino
);
696 es
->s_last_error_block
= cpu_to_le64(block
);
697 __save_error_info(sb
, function
, line
);
699 if (ext4_error_ratelimit(sb
)) {
703 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: group %u, ",
704 sb
->s_id
, function
, line
, grp
);
706 printk(KERN_CONT
"inode %lu: ", ino
);
708 printk(KERN_CONT
"block %llu:",
709 (unsigned long long) block
);
710 printk(KERN_CONT
"%pV\n", &vaf
);
714 if (test_opt(sb
, ERRORS_CONT
)) {
715 ext4_commit_super(sb
, 0);
719 ext4_unlock_group(sb
, grp
);
720 ext4_handle_error(sb
);
722 * We only get here in the ERRORS_RO case; relocking the group
723 * may be dangerous, but nothing bad will happen since the
724 * filesystem will have already been marked read/only and the
725 * journal has been aborted. We return 1 as a hint to callers
726 * who might what to use the return value from
727 * ext4_grp_locked_error() to distinguish between the
728 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
729 * aggressively from the ext4 function in question, with a
730 * more appropriate error code.
732 ext4_lock_group(sb
, grp
);
736 void ext4_update_dynamic_rev(struct super_block
*sb
)
738 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
740 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
744 "updating to rev %d because of new feature flag, "
745 "running e2fsck is recommended",
748 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
749 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
750 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
751 /* leave es->s_feature_*compat flags alone */
752 /* es->s_uuid will be set by e2fsck if empty */
755 * The rest of the superblock fields should be zero, and if not it
756 * means they are likely already in use, so leave them alone. We
757 * can leave it up to e2fsck to clean up any inconsistencies there.
762 * Open the external journal device
764 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
766 struct block_device
*bdev
;
767 char b
[BDEVNAME_SIZE
];
769 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
, sb
);
775 ext4_msg(sb
, KERN_ERR
, "failed to open journal device %s: %ld",
776 __bdevname(dev
, b
), PTR_ERR(bdev
));
781 * Release the journal device
783 static void ext4_blkdev_put(struct block_device
*bdev
)
785 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
788 static void ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
790 struct block_device
*bdev
;
791 bdev
= sbi
->journal_bdev
;
793 ext4_blkdev_put(bdev
);
794 sbi
->journal_bdev
= NULL
;
798 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
800 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
803 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
807 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
808 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
810 printk(KERN_ERR
"sb_info orphan list:\n");
811 list_for_each(l
, &sbi
->s_orphan
) {
812 struct inode
*inode
= orphan_list_entry(l
);
814 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
815 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
816 inode
->i_mode
, inode
->i_nlink
,
821 static void ext4_put_super(struct super_block
*sb
)
823 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
824 struct ext4_super_block
*es
= sbi
->s_es
;
827 ext4_unregister_li_request(sb
);
828 dquot_disable(sb
, -1, DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
830 flush_workqueue(sbi
->rsv_conversion_wq
);
831 destroy_workqueue(sbi
->rsv_conversion_wq
);
833 if (sbi
->s_journal
) {
834 err
= jbd2_journal_destroy(sbi
->s_journal
);
835 sbi
->s_journal
= NULL
;
837 ext4_abort(sb
, "Couldn't clean up the journal");
840 ext4_unregister_sysfs(sb
);
841 ext4_es_unregister_shrinker(sbi
);
842 del_timer_sync(&sbi
->s_err_report
);
843 ext4_release_system_zone(sb
);
845 ext4_ext_release(sb
);
847 if (!(sb
->s_flags
& MS_RDONLY
)) {
848 ext4_clear_feature_journal_needs_recovery(sb
);
849 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
851 if (!(sb
->s_flags
& MS_RDONLY
))
852 ext4_commit_super(sb
, 1);
854 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
855 brelse(sbi
->s_group_desc
[i
]);
856 kvfree(sbi
->s_group_desc
);
857 kvfree(sbi
->s_flex_groups
);
858 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
859 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
860 percpu_counter_destroy(&sbi
->s_dirs_counter
);
861 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
862 percpu_free_rwsem(&sbi
->s_journal_flag_rwsem
);
865 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
866 kfree(sbi
->s_qf_names
[i
]);
869 /* Debugging code just in case the in-memory inode orphan list
870 * isn't empty. The on-disk one can be non-empty if we've
871 * detected an error and taken the fs readonly, but the
872 * in-memory list had better be clean by this point. */
873 if (!list_empty(&sbi
->s_orphan
))
874 dump_orphan_list(sb
, sbi
);
875 J_ASSERT(list_empty(&sbi
->s_orphan
));
877 sync_blockdev(sb
->s_bdev
);
878 invalidate_bdev(sb
->s_bdev
);
879 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
881 * Invalidate the journal device's buffers. We don't want them
882 * floating about in memory - the physical journal device may
883 * hotswapped, and it breaks the `ro-after' testing code.
885 sync_blockdev(sbi
->journal_bdev
);
886 invalidate_bdev(sbi
->journal_bdev
);
887 ext4_blkdev_remove(sbi
);
889 if (sbi
->s_mb_cache
) {
890 ext4_xattr_destroy_cache(sbi
->s_mb_cache
);
891 sbi
->s_mb_cache
= NULL
;
894 kthread_stop(sbi
->s_mmp_tsk
);
895 sb
->s_fs_info
= NULL
;
897 * Now that we are completely done shutting down the
898 * superblock, we need to actually destroy the kobject.
900 kobject_put(&sbi
->s_kobj
);
901 wait_for_completion(&sbi
->s_kobj_unregister
);
902 if (sbi
->s_chksum_driver
)
903 crypto_free_shash(sbi
->s_chksum_driver
);
904 kfree(sbi
->s_blockgroup_lock
);
908 static struct kmem_cache
*ext4_inode_cachep
;
911 * Called inside transaction, so use GFP_NOFS
913 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
915 struct ext4_inode_info
*ei
;
917 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
921 ei
->vfs_inode
.i_version
= 1;
922 spin_lock_init(&ei
->i_raw_lock
);
923 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
924 spin_lock_init(&ei
->i_prealloc_lock
);
925 ext4_es_init_tree(&ei
->i_es_tree
);
926 rwlock_init(&ei
->i_es_lock
);
927 INIT_LIST_HEAD(&ei
->i_es_list
);
930 ei
->i_es_shrink_lblk
= 0;
931 ei
->i_reserved_data_blocks
= 0;
932 ei
->i_reserved_meta_blocks
= 0;
933 ei
->i_allocated_meta_blocks
= 0;
934 ei
->i_da_metadata_calc_len
= 0;
935 ei
->i_da_metadata_calc_last_lblock
= 0;
936 spin_lock_init(&(ei
->i_block_reservation_lock
));
938 ei
->i_reserved_quota
= 0;
939 memset(&ei
->i_dquot
, 0, sizeof(ei
->i_dquot
));
942 INIT_LIST_HEAD(&ei
->i_rsv_conversion_list
);
943 spin_lock_init(&ei
->i_completed_io_lock
);
945 ei
->i_datasync_tid
= 0;
946 atomic_set(&ei
->i_unwritten
, 0);
947 INIT_WORK(&ei
->i_rsv_conversion_work
, ext4_end_io_rsv_work
);
948 #ifdef CONFIG_EXT4_FS_ENCRYPTION
949 ei
->i_crypt_info
= NULL
;
951 return &ei
->vfs_inode
;
954 static int ext4_drop_inode(struct inode
*inode
)
956 int drop
= generic_drop_inode(inode
);
958 trace_ext4_drop_inode(inode
, drop
);
962 static void ext4_i_callback(struct rcu_head
*head
)
964 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
965 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
968 static void ext4_destroy_inode(struct inode
*inode
)
970 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
971 ext4_msg(inode
->i_sb
, KERN_ERR
,
972 "Inode %lu (%p): orphan list check failed!",
973 inode
->i_ino
, EXT4_I(inode
));
974 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
975 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
979 call_rcu(&inode
->i_rcu
, ext4_i_callback
);
982 static void init_once(void *foo
)
984 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
986 INIT_LIST_HEAD(&ei
->i_orphan
);
987 init_rwsem(&ei
->xattr_sem
);
988 init_rwsem(&ei
->i_data_sem
);
989 init_rwsem(&ei
->i_mmap_sem
);
990 inode_init_once(&ei
->vfs_inode
);
993 static int __init
init_inodecache(void)
995 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
996 sizeof(struct ext4_inode_info
),
997 0, (SLAB_RECLAIM_ACCOUNT
|
998 SLAB_MEM_SPREAD
|SLAB_ACCOUNT
),
1000 if (ext4_inode_cachep
== NULL
)
1005 static void destroy_inodecache(void)
1008 * Make sure all delayed rcu free inodes are flushed before we
1012 kmem_cache_destroy(ext4_inode_cachep
);
1015 void ext4_clear_inode(struct inode
*inode
)
1017 invalidate_inode_buffers(inode
);
1020 ext4_discard_preallocations(inode
);
1021 ext4_es_remove_extent(inode
, 0, EXT_MAX_BLOCKS
);
1022 if (EXT4_I(inode
)->jinode
) {
1023 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode
),
1024 EXT4_I(inode
)->jinode
);
1025 jbd2_free_inode(EXT4_I(inode
)->jinode
);
1026 EXT4_I(inode
)->jinode
= NULL
;
1028 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1029 if (EXT4_I(inode
)->i_crypt_info
)
1030 ext4_free_encryption_info(inode
, EXT4_I(inode
)->i_crypt_info
);
1034 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
1035 u64 ino
, u32 generation
)
1037 struct inode
*inode
;
1039 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
1040 return ERR_PTR(-ESTALE
);
1041 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
1042 return ERR_PTR(-ESTALE
);
1044 /* iget isn't really right if the inode is currently unallocated!!
1046 * ext4_read_inode will return a bad_inode if the inode had been
1047 * deleted, so we should be safe.
1049 * Currently we don't know the generation for parent directory, so
1050 * a generation of 0 means "accept any"
1052 inode
= ext4_iget_normal(sb
, ino
);
1054 return ERR_CAST(inode
);
1055 if (generation
&& inode
->i_generation
!= generation
) {
1057 return ERR_PTR(-ESTALE
);
1063 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
1064 int fh_len
, int fh_type
)
1066 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
1067 ext4_nfs_get_inode
);
1070 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
1071 int fh_len
, int fh_type
)
1073 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
1074 ext4_nfs_get_inode
);
1078 * Try to release metadata pages (indirect blocks, directories) which are
1079 * mapped via the block device. Since these pages could have journal heads
1080 * which would prevent try_to_free_buffers() from freeing them, we must use
1081 * jbd2 layer's try_to_free_buffers() function to release them.
1083 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
1086 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
1088 WARN_ON(PageChecked(page
));
1089 if (!page_has_buffers(page
))
1092 return jbd2_journal_try_to_free_buffers(journal
, page
,
1093 wait
& ~__GFP_DIRECT_RECLAIM
);
1094 return try_to_free_buffers(page
);
1098 static char *quotatypes
[] = INITQFNAMES
;
1099 #define QTYPE2NAME(t) (quotatypes[t])
1101 static int ext4_write_dquot(struct dquot
*dquot
);
1102 static int ext4_acquire_dquot(struct dquot
*dquot
);
1103 static int ext4_release_dquot(struct dquot
*dquot
);
1104 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1105 static int ext4_write_info(struct super_block
*sb
, int type
);
1106 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1108 static int ext4_quota_off(struct super_block
*sb
, int type
);
1109 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1110 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1111 size_t len
, loff_t off
);
1112 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1113 const char *data
, size_t len
, loff_t off
);
1114 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
1115 unsigned int flags
);
1116 static int ext4_enable_quotas(struct super_block
*sb
);
1117 static int ext4_get_next_id(struct super_block
*sb
, struct kqid
*qid
);
1119 static struct dquot
**ext4_get_dquots(struct inode
*inode
)
1121 return EXT4_I(inode
)->i_dquot
;
1124 static const struct dquot_operations ext4_quota_operations
= {
1125 .get_reserved_space
= ext4_get_reserved_space
,
1126 .write_dquot
= ext4_write_dquot
,
1127 .acquire_dquot
= ext4_acquire_dquot
,
1128 .release_dquot
= ext4_release_dquot
,
1129 .mark_dirty
= ext4_mark_dquot_dirty
,
1130 .write_info
= ext4_write_info
,
1131 .alloc_dquot
= dquot_alloc
,
1132 .destroy_dquot
= dquot_destroy
,
1133 .get_projid
= ext4_get_projid
,
1134 .get_next_id
= ext4_get_next_id
,
1137 static const struct quotactl_ops ext4_qctl_operations
= {
1138 .quota_on
= ext4_quota_on
,
1139 .quota_off
= ext4_quota_off
,
1140 .quota_sync
= dquot_quota_sync
,
1141 .get_state
= dquot_get_state
,
1142 .set_info
= dquot_set_dqinfo
,
1143 .get_dqblk
= dquot_get_dqblk
,
1144 .set_dqblk
= dquot_set_dqblk
,
1145 .get_nextdqblk
= dquot_get_next_dqblk
,
1149 static const struct super_operations ext4_sops
= {
1150 .alloc_inode
= ext4_alloc_inode
,
1151 .destroy_inode
= ext4_destroy_inode
,
1152 .write_inode
= ext4_write_inode
,
1153 .dirty_inode
= ext4_dirty_inode
,
1154 .drop_inode
= ext4_drop_inode
,
1155 .evict_inode
= ext4_evict_inode
,
1156 .put_super
= ext4_put_super
,
1157 .sync_fs
= ext4_sync_fs
,
1158 .freeze_fs
= ext4_freeze
,
1159 .unfreeze_fs
= ext4_unfreeze
,
1160 .statfs
= ext4_statfs
,
1161 .remount_fs
= ext4_remount
,
1162 .show_options
= ext4_show_options
,
1164 .quota_read
= ext4_quota_read
,
1165 .quota_write
= ext4_quota_write
,
1166 .get_dquots
= ext4_get_dquots
,
1168 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1171 static const struct export_operations ext4_export_ops
= {
1172 .fh_to_dentry
= ext4_fh_to_dentry
,
1173 .fh_to_parent
= ext4_fh_to_parent
,
1174 .get_parent
= ext4_get_parent
,
1178 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1179 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1180 Opt_nouid32
, Opt_debug
, Opt_removed
,
1181 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1182 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
,
1183 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
, Opt_journal_dev
,
1184 Opt_journal_path
, Opt_journal_checksum
, Opt_journal_async_commit
,
1185 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1186 Opt_data_err_abort
, Opt_data_err_ignore
, Opt_test_dummy_encryption
,
1187 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1188 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1189 Opt_noquota
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1190 Opt_usrquota
, Opt_grpquota
, Opt_i_version
, Opt_dax
,
1191 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
, Opt_mblk_io_submit
,
1192 Opt_lazytime
, Opt_nolazytime
,
1193 Opt_nomblk_io_submit
, Opt_block_validity
, Opt_noblock_validity
,
1194 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1195 Opt_dioread_nolock
, Opt_dioread_lock
,
1196 Opt_discard
, Opt_nodiscard
, Opt_init_itable
, Opt_noinit_itable
,
1197 Opt_max_dir_size_kb
, Opt_nojournal_checksum
,
1200 static const match_table_t tokens
= {
1201 {Opt_bsd_df
, "bsddf"},
1202 {Opt_minix_df
, "minixdf"},
1203 {Opt_grpid
, "grpid"},
1204 {Opt_grpid
, "bsdgroups"},
1205 {Opt_nogrpid
, "nogrpid"},
1206 {Opt_nogrpid
, "sysvgroups"},
1207 {Opt_resgid
, "resgid=%u"},
1208 {Opt_resuid
, "resuid=%u"},
1210 {Opt_err_cont
, "errors=continue"},
1211 {Opt_err_panic
, "errors=panic"},
1212 {Opt_err_ro
, "errors=remount-ro"},
1213 {Opt_nouid32
, "nouid32"},
1214 {Opt_debug
, "debug"},
1215 {Opt_removed
, "oldalloc"},
1216 {Opt_removed
, "orlov"},
1217 {Opt_user_xattr
, "user_xattr"},
1218 {Opt_nouser_xattr
, "nouser_xattr"},
1220 {Opt_noacl
, "noacl"},
1221 {Opt_noload
, "norecovery"},
1222 {Opt_noload
, "noload"},
1223 {Opt_removed
, "nobh"},
1224 {Opt_removed
, "bh"},
1225 {Opt_commit
, "commit=%u"},
1226 {Opt_min_batch_time
, "min_batch_time=%u"},
1227 {Opt_max_batch_time
, "max_batch_time=%u"},
1228 {Opt_journal_dev
, "journal_dev=%u"},
1229 {Opt_journal_path
, "journal_path=%s"},
1230 {Opt_journal_checksum
, "journal_checksum"},
1231 {Opt_nojournal_checksum
, "nojournal_checksum"},
1232 {Opt_journal_async_commit
, "journal_async_commit"},
1233 {Opt_abort
, "abort"},
1234 {Opt_data_journal
, "data=journal"},
1235 {Opt_data_ordered
, "data=ordered"},
1236 {Opt_data_writeback
, "data=writeback"},
1237 {Opt_data_err_abort
, "data_err=abort"},
1238 {Opt_data_err_ignore
, "data_err=ignore"},
1239 {Opt_offusrjquota
, "usrjquota="},
1240 {Opt_usrjquota
, "usrjquota=%s"},
1241 {Opt_offgrpjquota
, "grpjquota="},
1242 {Opt_grpjquota
, "grpjquota=%s"},
1243 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1244 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1245 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1246 {Opt_grpquota
, "grpquota"},
1247 {Opt_noquota
, "noquota"},
1248 {Opt_quota
, "quota"},
1249 {Opt_usrquota
, "usrquota"},
1250 {Opt_barrier
, "barrier=%u"},
1251 {Opt_barrier
, "barrier"},
1252 {Opt_nobarrier
, "nobarrier"},
1253 {Opt_i_version
, "i_version"},
1255 {Opt_stripe
, "stripe=%u"},
1256 {Opt_delalloc
, "delalloc"},
1257 {Opt_lazytime
, "lazytime"},
1258 {Opt_nolazytime
, "nolazytime"},
1259 {Opt_nodelalloc
, "nodelalloc"},
1260 {Opt_removed
, "mblk_io_submit"},
1261 {Opt_removed
, "nomblk_io_submit"},
1262 {Opt_block_validity
, "block_validity"},
1263 {Opt_noblock_validity
, "noblock_validity"},
1264 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1265 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1266 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1267 {Opt_auto_da_alloc
, "auto_da_alloc"},
1268 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1269 {Opt_dioread_nolock
, "dioread_nolock"},
1270 {Opt_dioread_lock
, "dioread_lock"},
1271 {Opt_discard
, "discard"},
1272 {Opt_nodiscard
, "nodiscard"},
1273 {Opt_init_itable
, "init_itable=%u"},
1274 {Opt_init_itable
, "init_itable"},
1275 {Opt_noinit_itable
, "noinit_itable"},
1276 {Opt_max_dir_size_kb
, "max_dir_size_kb=%u"},
1277 {Opt_test_dummy_encryption
, "test_dummy_encryption"},
1278 {Opt_removed
, "check=none"}, /* mount option from ext2/3 */
1279 {Opt_removed
, "nocheck"}, /* mount option from ext2/3 */
1280 {Opt_removed
, "reservation"}, /* mount option from ext2/3 */
1281 {Opt_removed
, "noreservation"}, /* mount option from ext2/3 */
1282 {Opt_removed
, "journal=%u"}, /* mount option from ext2/3 */
1286 static ext4_fsblk_t
get_sb_block(void **data
)
1288 ext4_fsblk_t sb_block
;
1289 char *options
= (char *) *data
;
1291 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1292 return 1; /* Default location */
1295 /* TODO: use simple_strtoll with >32bit ext4 */
1296 sb_block
= simple_strtoul(options
, &options
, 0);
1297 if (*options
&& *options
!= ',') {
1298 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1302 if (*options
== ',')
1304 *data
= (void *) options
;
1309 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1310 static char deprecated_msg
[] = "Mount option \"%s\" will be removed by %s\n"
1311 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1314 static int set_qf_name(struct super_block
*sb
, int qtype
, substring_t
*args
)
1316 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1320 if (sb_any_quota_loaded(sb
) &&
1321 !sbi
->s_qf_names
[qtype
]) {
1322 ext4_msg(sb
, KERN_ERR
,
1323 "Cannot change journaled "
1324 "quota options when quota turned on");
1327 if (ext4_has_feature_quota(sb
)) {
1328 ext4_msg(sb
, KERN_INFO
, "Journaled quota options "
1329 "ignored when QUOTA feature is enabled");
1332 qname
= match_strdup(args
);
1334 ext4_msg(sb
, KERN_ERR
,
1335 "Not enough memory for storing quotafile name");
1338 if (sbi
->s_qf_names
[qtype
]) {
1339 if (strcmp(sbi
->s_qf_names
[qtype
], qname
) == 0)
1342 ext4_msg(sb
, KERN_ERR
,
1343 "%s quota file already specified",
1347 if (strchr(qname
, '/')) {
1348 ext4_msg(sb
, KERN_ERR
,
1349 "quotafile must be on filesystem root");
1352 sbi
->s_qf_names
[qtype
] = qname
;
1360 static int clear_qf_name(struct super_block
*sb
, int qtype
)
1363 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1365 if (sb_any_quota_loaded(sb
) &&
1366 sbi
->s_qf_names
[qtype
]) {
1367 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled quota options"
1368 " when quota turned on");
1371 kfree(sbi
->s_qf_names
[qtype
]);
1372 sbi
->s_qf_names
[qtype
] = NULL
;
1377 #define MOPT_SET 0x0001
1378 #define MOPT_CLEAR 0x0002
1379 #define MOPT_NOSUPPORT 0x0004
1380 #define MOPT_EXPLICIT 0x0008
1381 #define MOPT_CLEAR_ERR 0x0010
1382 #define MOPT_GTE0 0x0020
1385 #define MOPT_QFMT 0x0040
1387 #define MOPT_Q MOPT_NOSUPPORT
1388 #define MOPT_QFMT MOPT_NOSUPPORT
1390 #define MOPT_DATAJ 0x0080
1391 #define MOPT_NO_EXT2 0x0100
1392 #define MOPT_NO_EXT3 0x0200
1393 #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1394 #define MOPT_STRING 0x0400
1396 static const struct mount_opts
{
1400 } ext4_mount_opts
[] = {
1401 {Opt_minix_df
, EXT4_MOUNT_MINIX_DF
, MOPT_SET
},
1402 {Opt_bsd_df
, EXT4_MOUNT_MINIX_DF
, MOPT_CLEAR
},
1403 {Opt_grpid
, EXT4_MOUNT_GRPID
, MOPT_SET
},
1404 {Opt_nogrpid
, EXT4_MOUNT_GRPID
, MOPT_CLEAR
},
1405 {Opt_block_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_SET
},
1406 {Opt_noblock_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_CLEAR
},
1407 {Opt_dioread_nolock
, EXT4_MOUNT_DIOREAD_NOLOCK
,
1408 MOPT_EXT4_ONLY
| MOPT_SET
},
1409 {Opt_dioread_lock
, EXT4_MOUNT_DIOREAD_NOLOCK
,
1410 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1411 {Opt_discard
, EXT4_MOUNT_DISCARD
, MOPT_SET
},
1412 {Opt_nodiscard
, EXT4_MOUNT_DISCARD
, MOPT_CLEAR
},
1413 {Opt_delalloc
, EXT4_MOUNT_DELALLOC
,
1414 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1415 {Opt_nodelalloc
, EXT4_MOUNT_DELALLOC
,
1416 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1417 {Opt_nojournal_checksum
, EXT4_MOUNT_JOURNAL_CHECKSUM
,
1418 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1419 {Opt_journal_checksum
, EXT4_MOUNT_JOURNAL_CHECKSUM
,
1420 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1421 {Opt_journal_async_commit
, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT
|
1422 EXT4_MOUNT_JOURNAL_CHECKSUM
),
1423 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1424 {Opt_noload
, EXT4_MOUNT_NOLOAD
, MOPT_NO_EXT2
| MOPT_SET
},
1425 {Opt_err_panic
, EXT4_MOUNT_ERRORS_PANIC
, MOPT_SET
| MOPT_CLEAR_ERR
},
1426 {Opt_err_ro
, EXT4_MOUNT_ERRORS_RO
, MOPT_SET
| MOPT_CLEAR_ERR
},
1427 {Opt_err_cont
, EXT4_MOUNT_ERRORS_CONT
, MOPT_SET
| MOPT_CLEAR_ERR
},
1428 {Opt_data_err_abort
, EXT4_MOUNT_DATA_ERR_ABORT
,
1430 {Opt_data_err_ignore
, EXT4_MOUNT_DATA_ERR_ABORT
,
1432 {Opt_barrier
, EXT4_MOUNT_BARRIER
, MOPT_SET
},
1433 {Opt_nobarrier
, EXT4_MOUNT_BARRIER
, MOPT_CLEAR
},
1434 {Opt_noauto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_SET
},
1435 {Opt_auto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_CLEAR
},
1436 {Opt_noinit_itable
, EXT4_MOUNT_INIT_INODE_TABLE
, MOPT_CLEAR
},
1437 {Opt_commit
, 0, MOPT_GTE0
},
1438 {Opt_max_batch_time
, 0, MOPT_GTE0
},
1439 {Opt_min_batch_time
, 0, MOPT_GTE0
},
1440 {Opt_inode_readahead_blks
, 0, MOPT_GTE0
},
1441 {Opt_init_itable
, 0, MOPT_GTE0
},
1442 {Opt_dax
, EXT4_MOUNT_DAX
, MOPT_SET
},
1443 {Opt_stripe
, 0, MOPT_GTE0
},
1444 {Opt_resuid
, 0, MOPT_GTE0
},
1445 {Opt_resgid
, 0, MOPT_GTE0
},
1446 {Opt_journal_dev
, 0, MOPT_NO_EXT2
| MOPT_GTE0
},
1447 {Opt_journal_path
, 0, MOPT_NO_EXT2
| MOPT_STRING
},
1448 {Opt_journal_ioprio
, 0, MOPT_NO_EXT2
| MOPT_GTE0
},
1449 {Opt_data_journal
, EXT4_MOUNT_JOURNAL_DATA
, MOPT_NO_EXT2
| MOPT_DATAJ
},
1450 {Opt_data_ordered
, EXT4_MOUNT_ORDERED_DATA
, MOPT_NO_EXT2
| MOPT_DATAJ
},
1451 {Opt_data_writeback
, EXT4_MOUNT_WRITEBACK_DATA
,
1452 MOPT_NO_EXT2
| MOPT_DATAJ
},
1453 {Opt_user_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_SET
},
1454 {Opt_nouser_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_CLEAR
},
1455 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1456 {Opt_acl
, EXT4_MOUNT_POSIX_ACL
, MOPT_SET
},
1457 {Opt_noacl
, EXT4_MOUNT_POSIX_ACL
, MOPT_CLEAR
},
1459 {Opt_acl
, 0, MOPT_NOSUPPORT
},
1460 {Opt_noacl
, 0, MOPT_NOSUPPORT
},
1462 {Opt_nouid32
, EXT4_MOUNT_NO_UID32
, MOPT_SET
},
1463 {Opt_debug
, EXT4_MOUNT_DEBUG
, MOPT_SET
},
1464 {Opt_quota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
, MOPT_SET
| MOPT_Q
},
1465 {Opt_usrquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
,
1467 {Opt_grpquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_GRPQUOTA
,
1469 {Opt_noquota
, (EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
|
1470 EXT4_MOUNT_GRPQUOTA
), MOPT_CLEAR
| MOPT_Q
},
1471 {Opt_usrjquota
, 0, MOPT_Q
},
1472 {Opt_grpjquota
, 0, MOPT_Q
},
1473 {Opt_offusrjquota
, 0, MOPT_Q
},
1474 {Opt_offgrpjquota
, 0, MOPT_Q
},
1475 {Opt_jqfmt_vfsold
, QFMT_VFS_OLD
, MOPT_QFMT
},
1476 {Opt_jqfmt_vfsv0
, QFMT_VFS_V0
, MOPT_QFMT
},
1477 {Opt_jqfmt_vfsv1
, QFMT_VFS_V1
, MOPT_QFMT
},
1478 {Opt_max_dir_size_kb
, 0, MOPT_GTE0
},
1479 {Opt_test_dummy_encryption
, 0, MOPT_GTE0
},
1483 static int handle_mount_opt(struct super_block
*sb
, char *opt
, int token
,
1484 substring_t
*args
, unsigned long *journal_devnum
,
1485 unsigned int *journal_ioprio
, int is_remount
)
1487 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1488 const struct mount_opts
*m
;
1494 if (token
== Opt_usrjquota
)
1495 return set_qf_name(sb
, USRQUOTA
, &args
[0]);
1496 else if (token
== Opt_grpjquota
)
1497 return set_qf_name(sb
, GRPQUOTA
, &args
[0]);
1498 else if (token
== Opt_offusrjquota
)
1499 return clear_qf_name(sb
, USRQUOTA
);
1500 else if (token
== Opt_offgrpjquota
)
1501 return clear_qf_name(sb
, GRPQUOTA
);
1505 case Opt_nouser_xattr
:
1506 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, opt
, "3.5");
1509 return 1; /* handled by get_sb_block() */
1511 ext4_msg(sb
, KERN_WARNING
, "Ignoring removed %s option", opt
);
1514 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1517 sb
->s_flags
|= MS_I_VERSION
;
1520 sb
->s_flags
|= MS_LAZYTIME
;
1522 case Opt_nolazytime
:
1523 sb
->s_flags
&= ~MS_LAZYTIME
;
1527 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++)
1528 if (token
== m
->token
)
1531 if (m
->token
== Opt_err
) {
1532 ext4_msg(sb
, KERN_ERR
, "Unrecognized mount option \"%s\" "
1533 "or missing value", opt
);
1537 if ((m
->flags
& MOPT_NO_EXT2
) && IS_EXT2_SB(sb
)) {
1538 ext4_msg(sb
, KERN_ERR
,
1539 "Mount option \"%s\" incompatible with ext2", opt
);
1542 if ((m
->flags
& MOPT_NO_EXT3
) && IS_EXT3_SB(sb
)) {
1543 ext4_msg(sb
, KERN_ERR
,
1544 "Mount option \"%s\" incompatible with ext3", opt
);
1548 if (args
->from
&& !(m
->flags
& MOPT_STRING
) && match_int(args
, &arg
))
1550 if (args
->from
&& (m
->flags
& MOPT_GTE0
) && (arg
< 0))
1552 if (m
->flags
& MOPT_EXPLICIT
) {
1553 if (m
->mount_opt
& EXT4_MOUNT_DELALLOC
) {
1554 set_opt2(sb
, EXPLICIT_DELALLOC
);
1555 } else if (m
->mount_opt
& EXT4_MOUNT_JOURNAL_CHECKSUM
) {
1556 set_opt2(sb
, EXPLICIT_JOURNAL_CHECKSUM
);
1560 if (m
->flags
& MOPT_CLEAR_ERR
)
1561 clear_opt(sb
, ERRORS_MASK
);
1562 if (token
== Opt_noquota
&& sb_any_quota_loaded(sb
)) {
1563 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1564 "options when quota turned on");
1568 if (m
->flags
& MOPT_NOSUPPORT
) {
1569 ext4_msg(sb
, KERN_ERR
, "%s option not supported", opt
);
1570 } else if (token
== Opt_commit
) {
1572 arg
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1573 sbi
->s_commit_interval
= HZ
* arg
;
1574 } else if (token
== Opt_max_batch_time
) {
1575 sbi
->s_max_batch_time
= arg
;
1576 } else if (token
== Opt_min_batch_time
) {
1577 sbi
->s_min_batch_time
= arg
;
1578 } else if (token
== Opt_inode_readahead_blks
) {
1579 if (arg
&& (arg
> (1 << 30) || !is_power_of_2(arg
))) {
1580 ext4_msg(sb
, KERN_ERR
,
1581 "EXT4-fs: inode_readahead_blks must be "
1582 "0 or a power of 2 smaller than 2^31");
1585 sbi
->s_inode_readahead_blks
= arg
;
1586 } else if (token
== Opt_init_itable
) {
1587 set_opt(sb
, INIT_INODE_TABLE
);
1589 arg
= EXT4_DEF_LI_WAIT_MULT
;
1590 sbi
->s_li_wait_mult
= arg
;
1591 } else if (token
== Opt_max_dir_size_kb
) {
1592 sbi
->s_max_dir_size_kb
= arg
;
1593 } else if (token
== Opt_stripe
) {
1594 sbi
->s_stripe
= arg
;
1595 } else if (token
== Opt_resuid
) {
1596 uid
= make_kuid(current_user_ns(), arg
);
1597 if (!uid_valid(uid
)) {
1598 ext4_msg(sb
, KERN_ERR
, "Invalid uid value %d", arg
);
1601 sbi
->s_resuid
= uid
;
1602 } else if (token
== Opt_resgid
) {
1603 gid
= make_kgid(current_user_ns(), arg
);
1604 if (!gid_valid(gid
)) {
1605 ext4_msg(sb
, KERN_ERR
, "Invalid gid value %d", arg
);
1608 sbi
->s_resgid
= gid
;
1609 } else if (token
== Opt_journal_dev
) {
1611 ext4_msg(sb
, KERN_ERR
,
1612 "Cannot specify journal on remount");
1615 *journal_devnum
= arg
;
1616 } else if (token
== Opt_journal_path
) {
1618 struct inode
*journal_inode
;
1623 ext4_msg(sb
, KERN_ERR
,
1624 "Cannot specify journal on remount");
1627 journal_path
= match_strdup(&args
[0]);
1628 if (!journal_path
) {
1629 ext4_msg(sb
, KERN_ERR
, "error: could not dup "
1630 "journal device string");
1634 error
= kern_path(journal_path
, LOOKUP_FOLLOW
, &path
);
1636 ext4_msg(sb
, KERN_ERR
, "error: could not find "
1637 "journal device path: error %d", error
);
1638 kfree(journal_path
);
1642 journal_inode
= d_inode(path
.dentry
);
1643 if (!S_ISBLK(journal_inode
->i_mode
)) {
1644 ext4_msg(sb
, KERN_ERR
, "error: journal path %s "
1645 "is not a block device", journal_path
);
1647 kfree(journal_path
);
1651 *journal_devnum
= new_encode_dev(journal_inode
->i_rdev
);
1653 kfree(journal_path
);
1654 } else if (token
== Opt_journal_ioprio
) {
1656 ext4_msg(sb
, KERN_ERR
, "Invalid journal IO priority"
1661 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
, arg
);
1662 } else if (token
== Opt_test_dummy_encryption
) {
1663 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1664 sbi
->s_mount_flags
|= EXT4_MF_TEST_DUMMY_ENCRYPTION
;
1665 ext4_msg(sb
, KERN_WARNING
,
1666 "Test dummy encryption mode enabled");
1668 ext4_msg(sb
, KERN_WARNING
,
1669 "Test dummy encryption mount option ignored");
1671 } else if (m
->flags
& MOPT_DATAJ
) {
1673 if (!sbi
->s_journal
)
1674 ext4_msg(sb
, KERN_WARNING
, "Remounting file system with no journal so ignoring journalled data option");
1675 else if (test_opt(sb
, DATA_FLAGS
) != m
->mount_opt
) {
1676 ext4_msg(sb
, KERN_ERR
,
1677 "Cannot change data mode on remount");
1681 clear_opt(sb
, DATA_FLAGS
);
1682 sbi
->s_mount_opt
|= m
->mount_opt
;
1685 } else if (m
->flags
& MOPT_QFMT
) {
1686 if (sb_any_quota_loaded(sb
) &&
1687 sbi
->s_jquota_fmt
!= m
->mount_opt
) {
1688 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled "
1689 "quota options when quota turned on");
1692 if (ext4_has_feature_quota(sb
)) {
1693 ext4_msg(sb
, KERN_INFO
,
1694 "Quota format mount options ignored "
1695 "when QUOTA feature is enabled");
1698 sbi
->s_jquota_fmt
= m
->mount_opt
;
1700 } else if (token
== Opt_dax
) {
1701 #ifdef CONFIG_FS_DAX
1702 ext4_msg(sb
, KERN_WARNING
,
1703 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1704 sbi
->s_mount_opt
|= m
->mount_opt
;
1706 ext4_msg(sb
, KERN_INFO
, "dax option not supported");
1709 } else if (token
== Opt_data_err_abort
) {
1710 sbi
->s_mount_opt
|= m
->mount_opt
;
1711 } else if (token
== Opt_data_err_ignore
) {
1712 sbi
->s_mount_opt
&= ~m
->mount_opt
;
1716 if (m
->flags
& MOPT_CLEAR
)
1718 else if (unlikely(!(m
->flags
& MOPT_SET
))) {
1719 ext4_msg(sb
, KERN_WARNING
,
1720 "buggy handling of option %s", opt
);
1725 sbi
->s_mount_opt
|= m
->mount_opt
;
1727 sbi
->s_mount_opt
&= ~m
->mount_opt
;
1732 static int parse_options(char *options
, struct super_block
*sb
,
1733 unsigned long *journal_devnum
,
1734 unsigned int *journal_ioprio
,
1737 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1739 substring_t args
[MAX_OPT_ARGS
];
1745 while ((p
= strsep(&options
, ",")) != NULL
) {
1749 * Initialize args struct so we know whether arg was
1750 * found; some options take optional arguments.
1752 args
[0].to
= args
[0].from
= NULL
;
1753 token
= match_token(p
, tokens
, args
);
1754 if (handle_mount_opt(sb
, p
, token
, args
, journal_devnum
,
1755 journal_ioprio
, is_remount
) < 0)
1759 if (ext4_has_feature_quota(sb
) &&
1760 (test_opt(sb
, USRQUOTA
) || test_opt(sb
, GRPQUOTA
))) {
1761 ext4_msg(sb
, KERN_INFO
, "Quota feature enabled, usrquota and grpquota "
1762 "mount options ignored.");
1763 clear_opt(sb
, USRQUOTA
);
1764 clear_opt(sb
, GRPQUOTA
);
1765 } else if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1766 if (test_opt(sb
, USRQUOTA
) && sbi
->s_qf_names
[USRQUOTA
])
1767 clear_opt(sb
, USRQUOTA
);
1769 if (test_opt(sb
, GRPQUOTA
) && sbi
->s_qf_names
[GRPQUOTA
])
1770 clear_opt(sb
, GRPQUOTA
);
1772 if (test_opt(sb
, GRPQUOTA
) || test_opt(sb
, USRQUOTA
)) {
1773 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1778 if (!sbi
->s_jquota_fmt
) {
1779 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1785 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
1787 BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
1789 if (blocksize
< PAGE_SIZE
) {
1790 ext4_msg(sb
, KERN_ERR
, "can't mount with "
1791 "dioread_nolock if block size != PAGE_SIZE");
1795 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
&&
1796 test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
1797 ext4_msg(sb
, KERN_ERR
, "can't mount with journal_async_commit "
1798 "in data=ordered mode");
1804 static inline void ext4_show_quota_options(struct seq_file
*seq
,
1805 struct super_block
*sb
)
1807 #if defined(CONFIG_QUOTA)
1808 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1810 if (sbi
->s_jquota_fmt
) {
1813 switch (sbi
->s_jquota_fmt
) {
1824 seq_printf(seq
, ",jqfmt=%s", fmtname
);
1827 if (sbi
->s_qf_names
[USRQUOTA
])
1828 seq_show_option(seq
, "usrjquota", sbi
->s_qf_names
[USRQUOTA
]);
1830 if (sbi
->s_qf_names
[GRPQUOTA
])
1831 seq_show_option(seq
, "grpjquota", sbi
->s_qf_names
[GRPQUOTA
]);
1835 static const char *token2str(int token
)
1837 const struct match_token
*t
;
1839 for (t
= tokens
; t
->token
!= Opt_err
; t
++)
1840 if (t
->token
== token
&& !strchr(t
->pattern
, '='))
1847 * - it's set to a non-default value OR
1848 * - if the per-sb default is different from the global default
1850 static int _ext4_show_options(struct seq_file
*seq
, struct super_block
*sb
,
1853 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1854 struct ext4_super_block
*es
= sbi
->s_es
;
1855 int def_errors
, def_mount_opt
= nodefs
? 0 : sbi
->s_def_mount_opt
;
1856 const struct mount_opts
*m
;
1857 char sep
= nodefs
? '\n' : ',';
1859 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1860 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1862 if (sbi
->s_sb_block
!= 1)
1863 SEQ_OPTS_PRINT("sb=%llu", sbi
->s_sb_block
);
1865 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++) {
1866 int want_set
= m
->flags
& MOPT_SET
;
1867 if (((m
->flags
& (MOPT_SET
|MOPT_CLEAR
)) == 0) ||
1868 (m
->flags
& MOPT_CLEAR_ERR
))
1870 if (!(m
->mount_opt
& (sbi
->s_mount_opt
^ def_mount_opt
)))
1871 continue; /* skip if same as the default */
1873 (sbi
->s_mount_opt
& m
->mount_opt
) != m
->mount_opt
) ||
1874 (!want_set
&& (sbi
->s_mount_opt
& m
->mount_opt
)))
1875 continue; /* select Opt_noFoo vs Opt_Foo */
1876 SEQ_OPTS_PRINT("%s", token2str(m
->token
));
1879 if (nodefs
|| !uid_eq(sbi
->s_resuid
, make_kuid(&init_user_ns
, EXT4_DEF_RESUID
)) ||
1880 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
)
1881 SEQ_OPTS_PRINT("resuid=%u",
1882 from_kuid_munged(&init_user_ns
, sbi
->s_resuid
));
1883 if (nodefs
|| !gid_eq(sbi
->s_resgid
, make_kgid(&init_user_ns
, EXT4_DEF_RESGID
)) ||
1884 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
)
1885 SEQ_OPTS_PRINT("resgid=%u",
1886 from_kgid_munged(&init_user_ns
, sbi
->s_resgid
));
1887 def_errors
= nodefs
? -1 : le16_to_cpu(es
->s_errors
);
1888 if (test_opt(sb
, ERRORS_RO
) && def_errors
!= EXT4_ERRORS_RO
)
1889 SEQ_OPTS_PUTS("errors=remount-ro");
1890 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
1891 SEQ_OPTS_PUTS("errors=continue");
1892 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
1893 SEQ_OPTS_PUTS("errors=panic");
1894 if (nodefs
|| sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
)
1895 SEQ_OPTS_PRINT("commit=%lu", sbi
->s_commit_interval
/ HZ
);
1896 if (nodefs
|| sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
)
1897 SEQ_OPTS_PRINT("min_batch_time=%u", sbi
->s_min_batch_time
);
1898 if (nodefs
|| sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
)
1899 SEQ_OPTS_PRINT("max_batch_time=%u", sbi
->s_max_batch_time
);
1900 if (sb
->s_flags
& MS_I_VERSION
)
1901 SEQ_OPTS_PUTS("i_version");
1902 if (nodefs
|| sbi
->s_stripe
)
1903 SEQ_OPTS_PRINT("stripe=%lu", sbi
->s_stripe
);
1904 if (EXT4_MOUNT_DATA_FLAGS
& (sbi
->s_mount_opt
^ def_mount_opt
)) {
1905 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
1906 SEQ_OPTS_PUTS("data=journal");
1907 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
1908 SEQ_OPTS_PUTS("data=ordered");
1909 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
1910 SEQ_OPTS_PUTS("data=writeback");
1913 sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
1914 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1915 sbi
->s_inode_readahead_blks
);
1917 if (nodefs
|| (test_opt(sb
, INIT_INODE_TABLE
) &&
1918 (sbi
->s_li_wait_mult
!= EXT4_DEF_LI_WAIT_MULT
)))
1919 SEQ_OPTS_PRINT("init_itable=%u", sbi
->s_li_wait_mult
);
1920 if (nodefs
|| sbi
->s_max_dir_size_kb
)
1921 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi
->s_max_dir_size_kb
);
1922 if (test_opt(sb
, DATA_ERR_ABORT
))
1923 SEQ_OPTS_PUTS("data_err=abort");
1925 ext4_show_quota_options(seq
, sb
);
1929 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
)
1931 return _ext4_show_options(seq
, root
->d_sb
, 0);
1934 int ext4_seq_options_show(struct seq_file
*seq
, void *offset
)
1936 struct super_block
*sb
= seq
->private;
1939 seq_puts(seq
, (sb
->s_flags
& MS_RDONLY
) ? "ro" : "rw");
1940 rc
= _ext4_show_options(seq
, sb
, 1);
1941 seq_puts(seq
, "\n");
1945 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1948 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1951 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1952 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
1953 "forcing read-only mode");
1958 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1959 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
1960 "running e2fsck is recommended");
1961 else if (sbi
->s_mount_state
& EXT4_ERROR_FS
)
1962 ext4_msg(sb
, KERN_WARNING
,
1963 "warning: mounting fs with errors, "
1964 "running e2fsck is recommended");
1965 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) > 0 &&
1966 le16_to_cpu(es
->s_mnt_count
) >=
1967 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1968 ext4_msg(sb
, KERN_WARNING
,
1969 "warning: maximal mount count reached, "
1970 "running e2fsck is recommended");
1971 else if (le32_to_cpu(es
->s_checkinterval
) &&
1972 (le32_to_cpu(es
->s_lastcheck
) +
1973 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1974 ext4_msg(sb
, KERN_WARNING
,
1975 "warning: checktime reached, "
1976 "running e2fsck is recommended");
1977 if (!sbi
->s_journal
)
1978 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1979 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1980 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1981 le16_add_cpu(&es
->s_mnt_count
, 1);
1982 es
->s_mtime
= cpu_to_le32(get_seconds());
1983 ext4_update_dynamic_rev(sb
);
1985 ext4_set_feature_journal_needs_recovery(sb
);
1987 ext4_commit_super(sb
, 1);
1989 if (test_opt(sb
, DEBUG
))
1990 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
1991 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1993 sbi
->s_groups_count
,
1994 EXT4_BLOCKS_PER_GROUP(sb
),
1995 EXT4_INODES_PER_GROUP(sb
),
1996 sbi
->s_mount_opt
, sbi
->s_mount_opt2
);
1998 cleancache_init_fs(sb
);
2002 int ext4_alloc_flex_bg_array(struct super_block
*sb
, ext4_group_t ngroup
)
2004 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2005 struct flex_groups
*new_groups
;
2008 if (!sbi
->s_log_groups_per_flex
)
2011 size
= ext4_flex_group(sbi
, ngroup
- 1) + 1;
2012 if (size
<= sbi
->s_flex_groups_allocated
)
2015 size
= roundup_pow_of_two(size
* sizeof(struct flex_groups
));
2016 new_groups
= ext4_kvzalloc(size
, GFP_KERNEL
);
2018 ext4_msg(sb
, KERN_ERR
, "not enough memory for %d flex groups",
2019 size
/ (int) sizeof(struct flex_groups
));
2023 if (sbi
->s_flex_groups
) {
2024 memcpy(new_groups
, sbi
->s_flex_groups
,
2025 (sbi
->s_flex_groups_allocated
*
2026 sizeof(struct flex_groups
)));
2027 kvfree(sbi
->s_flex_groups
);
2029 sbi
->s_flex_groups
= new_groups
;
2030 sbi
->s_flex_groups_allocated
= size
/ sizeof(struct flex_groups
);
2034 static int ext4_fill_flex_info(struct super_block
*sb
)
2036 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2037 struct ext4_group_desc
*gdp
= NULL
;
2038 ext4_group_t flex_group
;
2041 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
2042 if (sbi
->s_log_groups_per_flex
< 1 || sbi
->s_log_groups_per_flex
> 31) {
2043 sbi
->s_log_groups_per_flex
= 0;
2047 err
= ext4_alloc_flex_bg_array(sb
, sbi
->s_groups_count
);
2051 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
2052 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2054 flex_group
= ext4_flex_group(sbi
, i
);
2055 atomic_add(ext4_free_inodes_count(sb
, gdp
),
2056 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
2057 atomic64_add(ext4_free_group_clusters(sb
, gdp
),
2058 &sbi
->s_flex_groups
[flex_group
].free_clusters
);
2059 atomic_add(ext4_used_dirs_count(sb
, gdp
),
2060 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
2068 static __le16
ext4_group_desc_csum(struct super_block
*sb
, __u32 block_group
,
2069 struct ext4_group_desc
*gdp
)
2073 __le32 le_group
= cpu_to_le32(block_group
);
2074 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2076 if (ext4_has_metadata_csum(sbi
->s_sb
)) {
2077 /* Use new metadata_csum algorithm */
2081 save_csum
= gdp
->bg_checksum
;
2082 gdp
->bg_checksum
= 0;
2083 csum32
= ext4_chksum(sbi
, sbi
->s_csum_seed
, (__u8
*)&le_group
,
2085 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)gdp
,
2087 gdp
->bg_checksum
= save_csum
;
2089 crc
= csum32
& 0xFFFF;
2093 /* old crc16 code */
2094 if (!ext4_has_feature_gdt_csum(sb
))
2097 offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
2099 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
2100 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
2101 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
2102 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
2103 /* for checksum of struct ext4_group_desc do the rest...*/
2104 if (ext4_has_feature_64bit(sb
) &&
2105 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
2106 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
2107 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
2111 return cpu_to_le16(crc
);
2114 int ext4_group_desc_csum_verify(struct super_block
*sb
, __u32 block_group
,
2115 struct ext4_group_desc
*gdp
)
2117 if (ext4_has_group_desc_csum(sb
) &&
2118 (gdp
->bg_checksum
!= ext4_group_desc_csum(sb
, block_group
, gdp
)))
2124 void ext4_group_desc_csum_set(struct super_block
*sb
, __u32 block_group
,
2125 struct ext4_group_desc
*gdp
)
2127 if (!ext4_has_group_desc_csum(sb
))
2129 gdp
->bg_checksum
= ext4_group_desc_csum(sb
, block_group
, gdp
);
2132 /* Called at mount-time, super-block is locked */
2133 static int ext4_check_descriptors(struct super_block
*sb
,
2134 ext4_group_t
*first_not_zeroed
)
2136 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2137 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
2138 ext4_fsblk_t last_block
;
2139 ext4_fsblk_t block_bitmap
;
2140 ext4_fsblk_t inode_bitmap
;
2141 ext4_fsblk_t inode_table
;
2142 int flexbg_flag
= 0;
2143 ext4_group_t i
, grp
= sbi
->s_groups_count
;
2145 if (ext4_has_feature_flex_bg(sb
))
2148 ext4_debug("Checking group descriptors");
2150 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
2151 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2153 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
2154 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
2156 last_block
= first_block
+
2157 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2159 if ((grp
== sbi
->s_groups_count
) &&
2160 !(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2163 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
2164 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
2165 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2166 "Block bitmap for group %u not in group "
2167 "(block %llu)!", i
, block_bitmap
);
2170 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
2171 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
2172 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2173 "Inode bitmap for group %u not in group "
2174 "(block %llu)!", i
, inode_bitmap
);
2177 inode_table
= ext4_inode_table(sb
, gdp
);
2178 if (inode_table
< first_block
||
2179 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
2180 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2181 "Inode table for group %u not in group "
2182 "(block %llu)!", i
, inode_table
);
2185 ext4_lock_group(sb
, i
);
2186 if (!ext4_group_desc_csum_verify(sb
, i
, gdp
)) {
2187 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2188 "Checksum for group %u failed (%u!=%u)",
2189 i
, le16_to_cpu(ext4_group_desc_csum(sb
, i
,
2190 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
2191 if (!(sb
->s_flags
& MS_RDONLY
)) {
2192 ext4_unlock_group(sb
, i
);
2196 ext4_unlock_group(sb
, i
);
2198 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
2200 if (NULL
!= first_not_zeroed
)
2201 *first_not_zeroed
= grp
;
2205 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2206 * the superblock) which were deleted from all directories, but held open by
2207 * a process at the time of a crash. We walk the list and try to delete these
2208 * inodes at recovery time (only with a read-write filesystem).
2210 * In order to keep the orphan inode chain consistent during traversal (in
2211 * case of crash during recovery), we link each inode into the superblock
2212 * orphan list_head and handle it the same way as an inode deletion during
2213 * normal operation (which journals the operations for us).
2215 * We only do an iget() and an iput() on each inode, which is very safe if we
2216 * accidentally point at an in-use or already deleted inode. The worst that
2217 * can happen in this case is that we get a "bit already cleared" message from
2218 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2219 * e2fsck was run on this filesystem, and it must have already done the orphan
2220 * inode cleanup for us, so we can safely abort without any further action.
2222 static void ext4_orphan_cleanup(struct super_block
*sb
,
2223 struct ext4_super_block
*es
)
2225 unsigned int s_flags
= sb
->s_flags
;
2226 int nr_orphans
= 0, nr_truncates
= 0;
2230 if (!es
->s_last_orphan
) {
2231 jbd_debug(4, "no orphan inodes to clean up\n");
2235 if (bdev_read_only(sb
->s_bdev
)) {
2236 ext4_msg(sb
, KERN_ERR
, "write access "
2237 "unavailable, skipping orphan cleanup");
2241 /* Check if feature set would not allow a r/w mount */
2242 if (!ext4_feature_set_ok(sb
, 0)) {
2243 ext4_msg(sb
, KERN_INFO
, "Skipping orphan cleanup due to "
2244 "unknown ROCOMPAT features");
2248 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2249 /* don't clear list on RO mount w/ errors */
2250 if (es
->s_last_orphan
&& !(s_flags
& MS_RDONLY
)) {
2251 ext4_msg(sb
, KERN_INFO
, "Errors on filesystem, "
2252 "clearing orphan list.\n");
2253 es
->s_last_orphan
= 0;
2255 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2259 if (s_flags
& MS_RDONLY
) {
2260 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
2261 sb
->s_flags
&= ~MS_RDONLY
;
2264 /* Needed for iput() to work correctly and not trash data */
2265 sb
->s_flags
|= MS_ACTIVE
;
2266 /* Turn on quotas so that they are updated correctly */
2267 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++) {
2268 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
2269 int ret
= ext4_quota_on_mount(sb
, i
);
2271 ext4_msg(sb
, KERN_ERR
,
2272 "Cannot turn on journaled "
2273 "quota: error %d", ret
);
2278 while (es
->s_last_orphan
) {
2279 struct inode
*inode
;
2281 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
2282 if (IS_ERR(inode
)) {
2283 es
->s_last_orphan
= 0;
2287 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
2288 dquot_initialize(inode
);
2289 if (inode
->i_nlink
) {
2290 if (test_opt(sb
, DEBUG
))
2291 ext4_msg(sb
, KERN_DEBUG
,
2292 "%s: truncating inode %lu to %lld bytes",
2293 __func__
, inode
->i_ino
, inode
->i_size
);
2294 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2295 inode
->i_ino
, inode
->i_size
);
2297 truncate_inode_pages(inode
->i_mapping
, inode
->i_size
);
2298 ext4_truncate(inode
);
2299 inode_unlock(inode
);
2302 if (test_opt(sb
, DEBUG
))
2303 ext4_msg(sb
, KERN_DEBUG
,
2304 "%s: deleting unreferenced inode %lu",
2305 __func__
, inode
->i_ino
);
2306 jbd_debug(2, "deleting unreferenced inode %lu\n",
2310 iput(inode
); /* The delete magic happens here! */
2313 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2316 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
2317 PLURAL(nr_orphans
));
2319 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
2320 PLURAL(nr_truncates
));
2322 /* Turn quotas off */
2323 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++) {
2324 if (sb_dqopt(sb
)->files
[i
])
2325 dquot_quota_off(sb
, i
);
2328 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
2332 * Maximal extent format file size.
2333 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2334 * extent format containers, within a sector_t, and within i_blocks
2335 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2336 * so that won't be a limiting factor.
2338 * However there is other limiting factor. We do store extents in the form
2339 * of starting block and length, hence the resulting length of the extent
2340 * covering maximum file size must fit into on-disk format containers as
2341 * well. Given that length is always by 1 unit bigger than max unit (because
2342 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2344 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2346 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
2349 loff_t upper_limit
= MAX_LFS_FILESIZE
;
2351 /* small i_blocks in vfs inode? */
2352 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2354 * CONFIG_LBDAF is not enabled implies the inode
2355 * i_block represent total blocks in 512 bytes
2356 * 32 == size of vfs inode i_blocks * 8
2358 upper_limit
= (1LL << 32) - 1;
2360 /* total blocks in file system block size */
2361 upper_limit
>>= (blkbits
- 9);
2362 upper_limit
<<= blkbits
;
2366 * 32-bit extent-start container, ee_block. We lower the maxbytes
2367 * by one fs block, so ee_len can cover the extent of maximum file
2370 res
= (1LL << 32) - 1;
2373 /* Sanity check against vm- & vfs- imposed limits */
2374 if (res
> upper_limit
)
2381 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2382 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2383 * We need to be 1 filesystem block less than the 2^48 sector limit.
2385 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2387 loff_t res
= EXT4_NDIR_BLOCKS
;
2390 /* This is calculated to be the largest file size for a dense, block
2391 * mapped file such that the file's total number of 512-byte sectors,
2392 * including data and all indirect blocks, does not exceed (2^48 - 1).
2394 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2395 * number of 512-byte sectors of the file.
2398 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2400 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2401 * the inode i_block field represents total file blocks in
2402 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2404 upper_limit
= (1LL << 32) - 1;
2406 /* total blocks in file system block size */
2407 upper_limit
>>= (bits
- 9);
2411 * We use 48 bit ext4_inode i_blocks
2412 * With EXT4_HUGE_FILE_FL set the i_blocks
2413 * represent total number of blocks in
2414 * file system block size
2416 upper_limit
= (1LL << 48) - 1;
2420 /* indirect blocks */
2422 /* double indirect blocks */
2423 meta_blocks
+= 1 + (1LL << (bits
-2));
2424 /* tripple indirect blocks */
2425 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2427 upper_limit
-= meta_blocks
;
2428 upper_limit
<<= bits
;
2430 res
+= 1LL << (bits
-2);
2431 res
+= 1LL << (2*(bits
-2));
2432 res
+= 1LL << (3*(bits
-2));
2434 if (res
> upper_limit
)
2437 if (res
> MAX_LFS_FILESIZE
)
2438 res
= MAX_LFS_FILESIZE
;
2443 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2444 ext4_fsblk_t logical_sb_block
, int nr
)
2446 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2447 ext4_group_t bg
, first_meta_bg
;
2450 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2452 if (!ext4_has_feature_meta_bg(sb
) || nr
< first_meta_bg
)
2453 return logical_sb_block
+ nr
+ 1;
2454 bg
= sbi
->s_desc_per_block
* nr
;
2455 if (ext4_bg_has_super(sb
, bg
))
2459 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2460 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2461 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2464 if (sb
->s_blocksize
== 1024 && nr
== 0 &&
2465 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_first_data_block
) == 0)
2468 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2472 * ext4_get_stripe_size: Get the stripe size.
2473 * @sbi: In memory super block info
2475 * If we have specified it via mount option, then
2476 * use the mount option value. If the value specified at mount time is
2477 * greater than the blocks per group use the super block value.
2478 * If the super block value is greater than blocks per group return 0.
2479 * Allocator needs it be less than blocks per group.
2482 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2484 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2485 unsigned long stripe_width
=
2486 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2489 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2490 ret
= sbi
->s_stripe
;
2491 else if (stripe_width
<= sbi
->s_blocks_per_group
)
2493 else if (stride
<= sbi
->s_blocks_per_group
)
2499 * If the stripe width is 1, this makes no sense and
2500 * we set it to 0 to turn off stripe handling code.
2509 * Check whether this filesystem can be mounted based on
2510 * the features present and the RDONLY/RDWR mount requested.
2511 * Returns 1 if this filesystem can be mounted as requested,
2512 * 0 if it cannot be.
2514 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2516 if (ext4_has_unknown_ext4_incompat_features(sb
)) {
2517 ext4_msg(sb
, KERN_ERR
,
2518 "Couldn't mount because of "
2519 "unsupported optional features (%x)",
2520 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2521 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2528 if (ext4_has_feature_readonly(sb
)) {
2529 ext4_msg(sb
, KERN_INFO
, "filesystem is read-only");
2530 sb
->s_flags
|= MS_RDONLY
;
2534 /* Check that feature set is OK for a read-write mount */
2535 if (ext4_has_unknown_ext4_ro_compat_features(sb
)) {
2536 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2537 "unsupported optional features (%x)",
2538 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2539 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2543 * Large file size enabled file system can only be mounted
2544 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2546 if (ext4_has_feature_huge_file(sb
)) {
2547 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2548 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2549 "cannot be mounted RDWR without "
2554 if (ext4_has_feature_bigalloc(sb
) && !ext4_has_feature_extents(sb
)) {
2555 ext4_msg(sb
, KERN_ERR
,
2556 "Can't support bigalloc feature without "
2557 "extents feature\n");
2561 #ifndef CONFIG_QUOTA
2562 if (ext4_has_feature_quota(sb
) && !readonly
) {
2563 ext4_msg(sb
, KERN_ERR
,
2564 "Filesystem with quota feature cannot be mounted RDWR "
2565 "without CONFIG_QUOTA");
2568 if (ext4_has_feature_project(sb
) && !readonly
) {
2569 ext4_msg(sb
, KERN_ERR
,
2570 "Filesystem with project quota feature cannot be mounted RDWR "
2571 "without CONFIG_QUOTA");
2574 #endif /* CONFIG_QUOTA */
2579 * This function is called once a day if we have errors logged
2580 * on the file system
2582 static void print_daily_error_info(unsigned long arg
)
2584 struct super_block
*sb
= (struct super_block
*) arg
;
2585 struct ext4_sb_info
*sbi
;
2586 struct ext4_super_block
*es
;
2591 if (es
->s_error_count
)
2592 /* fsck newer than v1.41.13 is needed to clean this condition. */
2593 ext4_msg(sb
, KERN_NOTICE
, "error count since last fsck: %u",
2594 le32_to_cpu(es
->s_error_count
));
2595 if (es
->s_first_error_time
) {
2596 printk(KERN_NOTICE
"EXT4-fs (%s): initial error at time %u: %.*s:%d",
2597 sb
->s_id
, le32_to_cpu(es
->s_first_error_time
),
2598 (int) sizeof(es
->s_first_error_func
),
2599 es
->s_first_error_func
,
2600 le32_to_cpu(es
->s_first_error_line
));
2601 if (es
->s_first_error_ino
)
2602 printk(": inode %u",
2603 le32_to_cpu(es
->s_first_error_ino
));
2604 if (es
->s_first_error_block
)
2605 printk(": block %llu", (unsigned long long)
2606 le64_to_cpu(es
->s_first_error_block
));
2609 if (es
->s_last_error_time
) {
2610 printk(KERN_NOTICE
"EXT4-fs (%s): last error at time %u: %.*s:%d",
2611 sb
->s_id
, le32_to_cpu(es
->s_last_error_time
),
2612 (int) sizeof(es
->s_last_error_func
),
2613 es
->s_last_error_func
,
2614 le32_to_cpu(es
->s_last_error_line
));
2615 if (es
->s_last_error_ino
)
2616 printk(": inode %u",
2617 le32_to_cpu(es
->s_last_error_ino
));
2618 if (es
->s_last_error_block
)
2619 printk(": block %llu", (unsigned long long)
2620 le64_to_cpu(es
->s_last_error_block
));
2623 mod_timer(&sbi
->s_err_report
, jiffies
+ 24*60*60*HZ
); /* Once a day */
2626 /* Find next suitable group and run ext4_init_inode_table */
2627 static int ext4_run_li_request(struct ext4_li_request
*elr
)
2629 struct ext4_group_desc
*gdp
= NULL
;
2630 ext4_group_t group
, ngroups
;
2631 struct super_block
*sb
;
2632 unsigned long timeout
= 0;
2636 ngroups
= EXT4_SB(sb
)->s_groups_count
;
2639 for (group
= elr
->lr_next_group
; group
< ngroups
; group
++) {
2640 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2646 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2650 if (group
>= ngroups
)
2655 ret
= ext4_init_inode_table(sb
, group
,
2656 elr
->lr_timeout
? 0 : 1);
2657 if (elr
->lr_timeout
== 0) {
2658 timeout
= (jiffies
- timeout
) *
2659 elr
->lr_sbi
->s_li_wait_mult
;
2660 elr
->lr_timeout
= timeout
;
2662 elr
->lr_next_sched
= jiffies
+ elr
->lr_timeout
;
2663 elr
->lr_next_group
= group
+ 1;
2671 * Remove lr_request from the list_request and free the
2672 * request structure. Should be called with li_list_mtx held
2674 static void ext4_remove_li_request(struct ext4_li_request
*elr
)
2676 struct ext4_sb_info
*sbi
;
2683 list_del(&elr
->lr_request
);
2684 sbi
->s_li_request
= NULL
;
2688 static void ext4_unregister_li_request(struct super_block
*sb
)
2690 mutex_lock(&ext4_li_mtx
);
2691 if (!ext4_li_info
) {
2692 mutex_unlock(&ext4_li_mtx
);
2696 mutex_lock(&ext4_li_info
->li_list_mtx
);
2697 ext4_remove_li_request(EXT4_SB(sb
)->s_li_request
);
2698 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2699 mutex_unlock(&ext4_li_mtx
);
2702 static struct task_struct
*ext4_lazyinit_task
;
2705 * This is the function where ext4lazyinit thread lives. It walks
2706 * through the request list searching for next scheduled filesystem.
2707 * When such a fs is found, run the lazy initialization request
2708 * (ext4_rn_li_request) and keep track of the time spend in this
2709 * function. Based on that time we compute next schedule time of
2710 * the request. When walking through the list is complete, compute
2711 * next waking time and put itself into sleep.
2713 static int ext4_lazyinit_thread(void *arg
)
2715 struct ext4_lazy_init
*eli
= (struct ext4_lazy_init
*)arg
;
2716 struct list_head
*pos
, *n
;
2717 struct ext4_li_request
*elr
;
2718 unsigned long next_wakeup
, cur
;
2720 BUG_ON(NULL
== eli
);
2724 next_wakeup
= MAX_JIFFY_OFFSET
;
2726 mutex_lock(&eli
->li_list_mtx
);
2727 if (list_empty(&eli
->li_request_list
)) {
2728 mutex_unlock(&eli
->li_list_mtx
);
2732 list_for_each_safe(pos
, n
, &eli
->li_request_list
) {
2733 elr
= list_entry(pos
, struct ext4_li_request
,
2736 if (time_after_eq(jiffies
, elr
->lr_next_sched
)) {
2737 if (ext4_run_li_request(elr
) != 0) {
2738 /* error, remove the lazy_init job */
2739 ext4_remove_li_request(elr
);
2744 if (time_before(elr
->lr_next_sched
, next_wakeup
))
2745 next_wakeup
= elr
->lr_next_sched
;
2747 mutex_unlock(&eli
->li_list_mtx
);
2752 if ((time_after_eq(cur
, next_wakeup
)) ||
2753 (MAX_JIFFY_OFFSET
== next_wakeup
)) {
2758 schedule_timeout_interruptible(next_wakeup
- cur
);
2760 if (kthread_should_stop()) {
2761 ext4_clear_request_list();
2768 * It looks like the request list is empty, but we need
2769 * to check it under the li_list_mtx lock, to prevent any
2770 * additions into it, and of course we should lock ext4_li_mtx
2771 * to atomically free the list and ext4_li_info, because at
2772 * this point another ext4 filesystem could be registering
2775 mutex_lock(&ext4_li_mtx
);
2776 mutex_lock(&eli
->li_list_mtx
);
2777 if (!list_empty(&eli
->li_request_list
)) {
2778 mutex_unlock(&eli
->li_list_mtx
);
2779 mutex_unlock(&ext4_li_mtx
);
2782 mutex_unlock(&eli
->li_list_mtx
);
2783 kfree(ext4_li_info
);
2784 ext4_li_info
= NULL
;
2785 mutex_unlock(&ext4_li_mtx
);
2790 static void ext4_clear_request_list(void)
2792 struct list_head
*pos
, *n
;
2793 struct ext4_li_request
*elr
;
2795 mutex_lock(&ext4_li_info
->li_list_mtx
);
2796 list_for_each_safe(pos
, n
, &ext4_li_info
->li_request_list
) {
2797 elr
= list_entry(pos
, struct ext4_li_request
,
2799 ext4_remove_li_request(elr
);
2801 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2804 static int ext4_run_lazyinit_thread(void)
2806 ext4_lazyinit_task
= kthread_run(ext4_lazyinit_thread
,
2807 ext4_li_info
, "ext4lazyinit");
2808 if (IS_ERR(ext4_lazyinit_task
)) {
2809 int err
= PTR_ERR(ext4_lazyinit_task
);
2810 ext4_clear_request_list();
2811 kfree(ext4_li_info
);
2812 ext4_li_info
= NULL
;
2813 printk(KERN_CRIT
"EXT4-fs: error %d creating inode table "
2814 "initialization thread\n",
2818 ext4_li_info
->li_state
|= EXT4_LAZYINIT_RUNNING
;
2823 * Check whether it make sense to run itable init. thread or not.
2824 * If there is at least one uninitialized inode table, return
2825 * corresponding group number, else the loop goes through all
2826 * groups and return total number of groups.
2828 static ext4_group_t
ext4_has_uninit_itable(struct super_block
*sb
)
2830 ext4_group_t group
, ngroups
= EXT4_SB(sb
)->s_groups_count
;
2831 struct ext4_group_desc
*gdp
= NULL
;
2833 for (group
= 0; group
< ngroups
; group
++) {
2834 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2838 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2845 static int ext4_li_info_new(void)
2847 struct ext4_lazy_init
*eli
= NULL
;
2849 eli
= kzalloc(sizeof(*eli
), GFP_KERNEL
);
2853 INIT_LIST_HEAD(&eli
->li_request_list
);
2854 mutex_init(&eli
->li_list_mtx
);
2856 eli
->li_state
|= EXT4_LAZYINIT_QUIT
;
2863 static struct ext4_li_request
*ext4_li_request_new(struct super_block
*sb
,
2866 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2867 struct ext4_li_request
*elr
;
2869 elr
= kzalloc(sizeof(*elr
), GFP_KERNEL
);
2875 elr
->lr_next_group
= start
;
2878 * Randomize first schedule time of the request to
2879 * spread the inode table initialization requests
2882 elr
->lr_next_sched
= jiffies
+ (prandom_u32() %
2883 (EXT4_DEF_LI_MAX_START_DELAY
* HZ
));
2887 int ext4_register_li_request(struct super_block
*sb
,
2888 ext4_group_t first_not_zeroed
)
2890 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2891 struct ext4_li_request
*elr
= NULL
;
2892 ext4_group_t ngroups
= EXT4_SB(sb
)->s_groups_count
;
2895 mutex_lock(&ext4_li_mtx
);
2896 if (sbi
->s_li_request
!= NULL
) {
2898 * Reset timeout so it can be computed again, because
2899 * s_li_wait_mult might have changed.
2901 sbi
->s_li_request
->lr_timeout
= 0;
2905 if (first_not_zeroed
== ngroups
||
2906 (sb
->s_flags
& MS_RDONLY
) ||
2907 !test_opt(sb
, INIT_INODE_TABLE
))
2910 elr
= ext4_li_request_new(sb
, first_not_zeroed
);
2916 if (NULL
== ext4_li_info
) {
2917 ret
= ext4_li_info_new();
2922 mutex_lock(&ext4_li_info
->li_list_mtx
);
2923 list_add(&elr
->lr_request
, &ext4_li_info
->li_request_list
);
2924 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2926 sbi
->s_li_request
= elr
;
2928 * set elr to NULL here since it has been inserted to
2929 * the request_list and the removal and free of it is
2930 * handled by ext4_clear_request_list from now on.
2934 if (!(ext4_li_info
->li_state
& EXT4_LAZYINIT_RUNNING
)) {
2935 ret
= ext4_run_lazyinit_thread();
2940 mutex_unlock(&ext4_li_mtx
);
2947 * We do not need to lock anything since this is called on
2950 static void ext4_destroy_lazyinit_thread(void)
2953 * If thread exited earlier
2954 * there's nothing to be done.
2956 if (!ext4_li_info
|| !ext4_lazyinit_task
)
2959 kthread_stop(ext4_lazyinit_task
);
2962 static int set_journal_csum_feature_set(struct super_block
*sb
)
2965 int compat
, incompat
;
2966 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2968 if (ext4_has_metadata_csum(sb
)) {
2969 /* journal checksum v3 */
2971 incompat
= JBD2_FEATURE_INCOMPAT_CSUM_V3
;
2973 /* journal checksum v1 */
2974 compat
= JBD2_FEATURE_COMPAT_CHECKSUM
;
2978 jbd2_journal_clear_features(sbi
->s_journal
,
2979 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
2980 JBD2_FEATURE_INCOMPAT_CSUM_V3
|
2981 JBD2_FEATURE_INCOMPAT_CSUM_V2
);
2982 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
2983 ret
= jbd2_journal_set_features(sbi
->s_journal
,
2985 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
|
2987 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
2988 ret
= jbd2_journal_set_features(sbi
->s_journal
,
2991 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
2992 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
2994 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
2995 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3002 * Note: calculating the overhead so we can be compatible with
3003 * historical BSD practice is quite difficult in the face of
3004 * clusters/bigalloc. This is because multiple metadata blocks from
3005 * different block group can end up in the same allocation cluster.
3006 * Calculating the exact overhead in the face of clustered allocation
3007 * requires either O(all block bitmaps) in memory or O(number of block
3008 * groups**2) in time. We will still calculate the superblock for
3009 * older file systems --- and if we come across with a bigalloc file
3010 * system with zero in s_overhead_clusters the estimate will be close to
3011 * correct especially for very large cluster sizes --- but for newer
3012 * file systems, it's better to calculate this figure once at mkfs
3013 * time, and store it in the superblock. If the superblock value is
3014 * present (even for non-bigalloc file systems), we will use it.
3016 static int count_overhead(struct super_block
*sb
, ext4_group_t grp
,
3019 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3020 struct ext4_group_desc
*gdp
;
3021 ext4_fsblk_t first_block
, last_block
, b
;
3022 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3023 int s
, j
, count
= 0;
3025 if (!ext4_has_feature_bigalloc(sb
))
3026 return (ext4_bg_has_super(sb
, grp
) + ext4_bg_num_gdb(sb
, grp
) +
3027 sbi
->s_itb_per_group
+ 2);
3029 first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
) +
3030 (grp
* EXT4_BLOCKS_PER_GROUP(sb
));
3031 last_block
= first_block
+ EXT4_BLOCKS_PER_GROUP(sb
) - 1;
3032 for (i
= 0; i
< ngroups
; i
++) {
3033 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
3034 b
= ext4_block_bitmap(sb
, gdp
);
3035 if (b
>= first_block
&& b
<= last_block
) {
3036 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3039 b
= ext4_inode_bitmap(sb
, gdp
);
3040 if (b
>= first_block
&& b
<= last_block
) {
3041 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3044 b
= ext4_inode_table(sb
, gdp
);
3045 if (b
>= first_block
&& b
+ sbi
->s_itb_per_group
<= last_block
)
3046 for (j
= 0; j
< sbi
->s_itb_per_group
; j
++, b
++) {
3047 int c
= EXT4_B2C(sbi
, b
- first_block
);
3048 ext4_set_bit(c
, buf
);
3054 if (ext4_bg_has_super(sb
, grp
)) {
3055 ext4_set_bit(s
++, buf
);
3058 for (j
= ext4_bg_num_gdb(sb
, grp
); j
> 0; j
--) {
3059 ext4_set_bit(EXT4_B2C(sbi
, s
++), buf
);
3065 return EXT4_CLUSTERS_PER_GROUP(sb
) -
3066 ext4_count_free(buf
, EXT4_CLUSTERS_PER_GROUP(sb
) / 8);
3070 * Compute the overhead and stash it in sbi->s_overhead
3072 int ext4_calculate_overhead(struct super_block
*sb
)
3074 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3075 struct ext4_super_block
*es
= sbi
->s_es
;
3076 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3077 ext4_fsblk_t overhead
= 0;
3078 char *buf
= (char *) get_zeroed_page(GFP_NOFS
);
3084 * Compute the overhead (FS structures). This is constant
3085 * for a given filesystem unless the number of block groups
3086 * changes so we cache the previous value until it does.
3090 * All of the blocks before first_data_block are overhead
3092 overhead
= EXT4_B2C(sbi
, le32_to_cpu(es
->s_first_data_block
));
3095 * Add the overhead found in each block group
3097 for (i
= 0; i
< ngroups
; i
++) {
3100 blks
= count_overhead(sb
, i
, buf
);
3103 memset(buf
, 0, PAGE_SIZE
);
3106 /* Add the internal journal blocks as well */
3107 if (sbi
->s_journal
&& !sbi
->journal_bdev
)
3108 overhead
+= EXT4_NUM_B2C(sbi
, sbi
->s_journal
->j_maxlen
);
3110 sbi
->s_overhead
= overhead
;
3112 free_page((unsigned long) buf
);
3116 static void ext4_set_resv_clusters(struct super_block
*sb
)
3118 ext4_fsblk_t resv_clusters
;
3119 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3122 * There's no need to reserve anything when we aren't using extents.
3123 * The space estimates are exact, there are no unwritten extents,
3124 * hole punching doesn't need new metadata... This is needed especially
3125 * to keep ext2/3 backward compatibility.
3127 if (!ext4_has_feature_extents(sb
))
3130 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3131 * This should cover the situations where we can not afford to run
3132 * out of space like for example punch hole, or converting
3133 * unwritten extents in delalloc path. In most cases such
3134 * allocation would require 1, or 2 blocks, higher numbers are
3137 resv_clusters
= (ext4_blocks_count(sbi
->s_es
) >>
3138 sbi
->s_cluster_bits
);
3140 do_div(resv_clusters
, 50);
3141 resv_clusters
= min_t(ext4_fsblk_t
, resv_clusters
, 4096);
3143 atomic64_set(&sbi
->s_resv_clusters
, resv_clusters
);
3146 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
3148 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
3149 struct buffer_head
*bh
;
3150 struct ext4_super_block
*es
= NULL
;
3151 struct ext4_sb_info
*sbi
;
3153 ext4_fsblk_t sb_block
= get_sb_block(&data
);
3154 ext4_fsblk_t logical_sb_block
;
3155 unsigned long offset
= 0;
3156 unsigned long journal_devnum
= 0;
3157 unsigned long def_mount_opts
;
3161 int blocksize
, clustersize
;
3162 unsigned int db_count
;
3164 int needs_recovery
, has_huge_files
, has_bigalloc
;
3167 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3168 ext4_group_t first_not_zeroed
;
3170 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
3174 sbi
->s_blockgroup_lock
=
3175 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
3176 if (!sbi
->s_blockgroup_lock
) {
3180 sb
->s_fs_info
= sbi
;
3182 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
3183 sbi
->s_sb_block
= sb_block
;
3184 if (sb
->s_bdev
->bd_part
)
3185 sbi
->s_sectors_written_start
=
3186 part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]);
3188 /* Cleanup superblock name */
3189 strreplace(sb
->s_id
, '/', '!');
3191 /* -EINVAL is default */
3193 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
3195 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
3200 * The ext4 superblock will not be buffer aligned for other than 1kB
3201 * block sizes. We need to calculate the offset from buffer start.
3203 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
3204 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3205 offset
= do_div(logical_sb_block
, blocksize
);
3207 logical_sb_block
= sb_block
;
3210 if (!(bh
= sb_bread_unmovable(sb
, logical_sb_block
))) {
3211 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
3215 * Note: s_es must be initialized as soon as possible because
3216 * some ext4 macro-instructions depend on its value
3218 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
3220 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
3221 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
3223 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
3225 /* Warn if metadata_csum and gdt_csum are both set. */
3226 if (ext4_has_feature_metadata_csum(sb
) &&
3227 ext4_has_feature_gdt_csum(sb
))
3228 ext4_warning(sb
, "metadata_csum and uninit_bg are "
3229 "redundant flags; please run fsck.");
3231 /* Check for a known checksum algorithm */
3232 if (!ext4_verify_csum_type(sb
, es
)) {
3233 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3234 "unknown checksum algorithm.");
3239 /* Load the checksum driver */
3240 if (ext4_has_feature_metadata_csum(sb
)) {
3241 sbi
->s_chksum_driver
= crypto_alloc_shash("crc32c", 0, 0);
3242 if (IS_ERR(sbi
->s_chksum_driver
)) {
3243 ext4_msg(sb
, KERN_ERR
, "Cannot load crc32c driver.");
3244 ret
= PTR_ERR(sbi
->s_chksum_driver
);
3245 sbi
->s_chksum_driver
= NULL
;
3250 /* Check superblock checksum */
3251 if (!ext4_superblock_csum_verify(sb
, es
)) {
3252 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3253 "invalid superblock checksum. Run e2fsck?");
3259 /* Precompute checksum seed for all metadata */
3260 if (ext4_has_feature_csum_seed(sb
))
3261 sbi
->s_csum_seed
= le32_to_cpu(es
->s_checksum_seed
);
3262 else if (ext4_has_metadata_csum(sb
))
3263 sbi
->s_csum_seed
= ext4_chksum(sbi
, ~0, es
->s_uuid
,
3264 sizeof(es
->s_uuid
));
3266 /* Set defaults before we parse the mount options */
3267 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
3268 set_opt(sb
, INIT_INODE_TABLE
);
3269 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
3271 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
3273 if (def_mount_opts
& EXT4_DEFM_UID16
)
3274 set_opt(sb
, NO_UID32
);
3275 /* xattr user namespace & acls are now defaulted on */
3276 set_opt(sb
, XATTR_USER
);
3277 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3278 set_opt(sb
, POSIX_ACL
);
3280 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3281 if (ext4_has_metadata_csum(sb
))
3282 set_opt(sb
, JOURNAL_CHECKSUM
);
3284 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
3285 set_opt(sb
, JOURNAL_DATA
);
3286 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
3287 set_opt(sb
, ORDERED_DATA
);
3288 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
3289 set_opt(sb
, WRITEBACK_DATA
);
3291 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
3292 set_opt(sb
, ERRORS_PANIC
);
3293 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
3294 set_opt(sb
, ERRORS_CONT
);
3296 set_opt(sb
, ERRORS_RO
);
3297 /* block_validity enabled by default; disable with noblock_validity */
3298 set_opt(sb
, BLOCK_VALIDITY
);
3299 if (def_mount_opts
& EXT4_DEFM_DISCARD
)
3300 set_opt(sb
, DISCARD
);
3302 sbi
->s_resuid
= make_kuid(&init_user_ns
, le16_to_cpu(es
->s_def_resuid
));
3303 sbi
->s_resgid
= make_kgid(&init_user_ns
, le16_to_cpu(es
->s_def_resgid
));
3304 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
3305 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
3306 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
3308 if ((def_mount_opts
& EXT4_DEFM_NOBARRIER
) == 0)
3309 set_opt(sb
, BARRIER
);
3312 * enable delayed allocation by default
3313 * Use -o nodelalloc to turn it off
3315 if (!IS_EXT3_SB(sb
) && !IS_EXT2_SB(sb
) &&
3316 ((def_mount_opts
& EXT4_DEFM_NODELALLOC
) == 0))
3317 set_opt(sb
, DELALLOC
);
3320 * set default s_li_wait_mult for lazyinit, for the case there is
3321 * no mount option specified.
3323 sbi
->s_li_wait_mult
= EXT4_DEF_LI_WAIT_MULT
;
3325 if (!parse_options((char *) sbi
->s_es
->s_mount_opts
, sb
,
3326 &journal_devnum
, &journal_ioprio
, 0)) {
3327 ext4_msg(sb
, KERN_WARNING
,
3328 "failed to parse options in superblock: %s",
3329 sbi
->s_es
->s_mount_opts
);
3331 sbi
->s_def_mount_opt
= sbi
->s_mount_opt
;
3332 if (!parse_options((char *) data
, sb
, &journal_devnum
,
3333 &journal_ioprio
, 0))
3336 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
3337 printk_once(KERN_WARNING
"EXT4-fs: Warning: mounting "
3338 "with data=journal disables delayed "
3339 "allocation and O_DIRECT support!\n");
3340 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
3341 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3342 "both data=journal and delalloc");
3345 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
3346 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3347 "both data=journal and dioread_nolock");
3350 if (test_opt(sb
, DAX
)) {
3351 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3352 "both data=journal and dax");
3355 if (test_opt(sb
, DELALLOC
))
3356 clear_opt(sb
, DELALLOC
);
3358 sb
->s_iflags
|= SB_I_CGROUPWB
;
3361 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3362 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
3364 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
3365 (ext4_has_compat_features(sb
) ||
3366 ext4_has_ro_compat_features(sb
) ||
3367 ext4_has_incompat_features(sb
)))
3368 ext4_msg(sb
, KERN_WARNING
,
3369 "feature flags set on rev 0 fs, "
3370 "running e2fsck is recommended");
3372 if (es
->s_creator_os
== cpu_to_le32(EXT4_OS_HURD
)) {
3373 set_opt2(sb
, HURD_COMPAT
);
3374 if (ext4_has_feature_64bit(sb
)) {
3375 ext4_msg(sb
, KERN_ERR
,
3376 "The Hurd can't support 64-bit file systems");
3381 if (IS_EXT2_SB(sb
)) {
3382 if (ext2_feature_set_ok(sb
))
3383 ext4_msg(sb
, KERN_INFO
, "mounting ext2 file system "
3384 "using the ext4 subsystem");
3386 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext2 due "
3387 "to feature incompatibilities");
3392 if (IS_EXT3_SB(sb
)) {
3393 if (ext3_feature_set_ok(sb
))
3394 ext4_msg(sb
, KERN_INFO
, "mounting ext3 file system "
3395 "using the ext4 subsystem");
3397 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext3 due "
3398 "to feature incompatibilities");
3404 * Check feature flags regardless of the revision level, since we
3405 * previously didn't change the revision level when setting the flags,
3406 * so there is a chance incompat flags are set on a rev 0 filesystem.
3408 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
3411 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
3412 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
3413 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
3414 ext4_msg(sb
, KERN_ERR
,
3415 "Unsupported filesystem blocksize %d", blocksize
);
3419 if (sbi
->s_mount_opt
& EXT4_MOUNT_DAX
) {
3420 err
= bdev_dax_supported(sb
, blocksize
);
3425 if (ext4_has_feature_encrypt(sb
) && es
->s_encryption_level
) {
3426 ext4_msg(sb
, KERN_ERR
, "Unsupported encryption level %d",
3427 es
->s_encryption_level
);
3431 if (sb
->s_blocksize
!= blocksize
) {
3432 /* Validate the filesystem blocksize */
3433 if (!sb_set_blocksize(sb
, blocksize
)) {
3434 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
3440 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3441 offset
= do_div(logical_sb_block
, blocksize
);
3442 bh
= sb_bread_unmovable(sb
, logical_sb_block
);
3444 ext4_msg(sb
, KERN_ERR
,
3445 "Can't read superblock on 2nd try");
3448 es
= (struct ext4_super_block
*)(bh
->b_data
+ offset
);
3450 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
3451 ext4_msg(sb
, KERN_ERR
,
3452 "Magic mismatch, very weird!");
3457 has_huge_files
= ext4_has_feature_huge_file(sb
);
3458 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
3460 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
3462 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
3463 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
3464 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
3466 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
3467 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
3468 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
3469 (!is_power_of_2(sbi
->s_inode_size
)) ||
3470 (sbi
->s_inode_size
> blocksize
)) {
3471 ext4_msg(sb
, KERN_ERR
,
3472 "unsupported inode size: %d",
3476 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
3477 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
3480 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
3481 if (ext4_has_feature_64bit(sb
)) {
3482 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
3483 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
3484 !is_power_of_2(sbi
->s_desc_size
)) {
3485 ext4_msg(sb
, KERN_ERR
,
3486 "unsupported descriptor size %lu",
3491 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
3493 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
3494 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
3495 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
3498 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
3499 if (sbi
->s_inodes_per_block
== 0)
3501 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
3502 sbi
->s_inodes_per_block
;
3503 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
3505 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3506 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
3507 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
3509 for (i
= 0; i
< 4; i
++)
3510 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
3511 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
3512 if (ext4_has_feature_dir_index(sb
)) {
3513 i
= le32_to_cpu(es
->s_flags
);
3514 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
3515 sbi
->s_hash_unsigned
= 3;
3516 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
3517 #ifdef __CHAR_UNSIGNED__
3518 if (!(sb
->s_flags
& MS_RDONLY
))
3520 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
3521 sbi
->s_hash_unsigned
= 3;
3523 if (!(sb
->s_flags
& MS_RDONLY
))
3525 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
3530 /* Handle clustersize */
3531 clustersize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_cluster_size
);
3532 has_bigalloc
= ext4_has_feature_bigalloc(sb
);
3534 if (clustersize
< blocksize
) {
3535 ext4_msg(sb
, KERN_ERR
,
3536 "cluster size (%d) smaller than "
3537 "block size (%d)", clustersize
, blocksize
);
3540 sbi
->s_cluster_bits
= le32_to_cpu(es
->s_log_cluster_size
) -
3541 le32_to_cpu(es
->s_log_block_size
);
3542 sbi
->s_clusters_per_group
=
3543 le32_to_cpu(es
->s_clusters_per_group
);
3544 if (sbi
->s_clusters_per_group
> blocksize
* 8) {
3545 ext4_msg(sb
, KERN_ERR
,
3546 "#clusters per group too big: %lu",
3547 sbi
->s_clusters_per_group
);
3550 if (sbi
->s_blocks_per_group
!=
3551 (sbi
->s_clusters_per_group
* (clustersize
/ blocksize
))) {
3552 ext4_msg(sb
, KERN_ERR
, "blocks per group (%lu) and "
3553 "clusters per group (%lu) inconsistent",
3554 sbi
->s_blocks_per_group
,
3555 sbi
->s_clusters_per_group
);
3559 if (clustersize
!= blocksize
) {
3560 ext4_warning(sb
, "fragment/cluster size (%d) != "
3561 "block size (%d)", clustersize
,
3563 clustersize
= blocksize
;
3565 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
3566 ext4_msg(sb
, KERN_ERR
,
3567 "#blocks per group too big: %lu",
3568 sbi
->s_blocks_per_group
);
3571 sbi
->s_clusters_per_group
= sbi
->s_blocks_per_group
;
3572 sbi
->s_cluster_bits
= 0;
3574 sbi
->s_cluster_ratio
= clustersize
/ blocksize
;
3576 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
3577 ext4_msg(sb
, KERN_ERR
,
3578 "#inodes per group too big: %lu",
3579 sbi
->s_inodes_per_group
);
3583 /* Do we have standard group size of clustersize * 8 blocks ? */
3584 if (sbi
->s_blocks_per_group
== clustersize
<< 3)
3585 set_opt2(sb
, STD_GROUP_SIZE
);
3588 * Test whether we have more sectors than will fit in sector_t,
3589 * and whether the max offset is addressable by the page cache.
3591 err
= generic_check_addressable(sb
->s_blocksize_bits
,
3592 ext4_blocks_count(es
));
3594 ext4_msg(sb
, KERN_ERR
, "filesystem"
3595 " too large to mount safely on this system");
3596 if (sizeof(sector_t
) < 8)
3597 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
3601 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
3604 /* check blocks count against device size */
3605 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
3606 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
3607 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
3608 "exceeds size of device (%llu blocks)",
3609 ext4_blocks_count(es
), blocks_count
);
3614 * It makes no sense for the first data block to be beyond the end
3615 * of the filesystem.
3617 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
3618 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data "
3619 "block %u is beyond end of filesystem (%llu)",
3620 le32_to_cpu(es
->s_first_data_block
),
3621 ext4_blocks_count(es
));
3624 blocks_count
= (ext4_blocks_count(es
) -
3625 le32_to_cpu(es
->s_first_data_block
) +
3626 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
3627 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
3628 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
3629 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
3630 "(block count %llu, first data block %u, "
3631 "blocks per group %lu)", sbi
->s_groups_count
,
3632 ext4_blocks_count(es
),
3633 le32_to_cpu(es
->s_first_data_block
),
3634 EXT4_BLOCKS_PER_GROUP(sb
));
3637 sbi
->s_groups_count
= blocks_count
;
3638 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
3639 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
3640 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
3641 EXT4_DESC_PER_BLOCK(sb
);
3642 sbi
->s_group_desc
= ext4_kvmalloc(db_count
*
3643 sizeof(struct buffer_head
*),
3645 if (sbi
->s_group_desc
== NULL
) {
3646 ext4_msg(sb
, KERN_ERR
, "not enough memory");
3651 bgl_lock_init(sbi
->s_blockgroup_lock
);
3653 for (i
= 0; i
< db_count
; i
++) {
3654 block
= descriptor_loc(sb
, logical_sb_block
, i
);
3655 sbi
->s_group_desc
[i
] = sb_bread_unmovable(sb
, block
);
3656 if (!sbi
->s_group_desc
[i
]) {
3657 ext4_msg(sb
, KERN_ERR
,
3658 "can't read group descriptor %d", i
);
3663 if (!ext4_check_descriptors(sb
, &first_not_zeroed
)) {
3664 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
3665 ret
= -EFSCORRUPTED
;
3669 sbi
->s_gdb_count
= db_count
;
3670 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
3671 spin_lock_init(&sbi
->s_next_gen_lock
);
3673 setup_timer(&sbi
->s_err_report
, print_daily_error_info
,
3674 (unsigned long) sb
);
3676 /* Register extent status tree shrinker */
3677 if (ext4_es_register_shrinker(sbi
))
3680 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
3681 sbi
->s_extent_max_zeroout_kb
= 32;
3684 * set up enough so that it can read an inode
3686 sb
->s_op
= &ext4_sops
;
3687 sb
->s_export_op
= &ext4_export_ops
;
3688 sb
->s_xattr
= ext4_xattr_handlers
;
3690 sb
->dq_op
= &ext4_quota_operations
;
3691 if (ext4_has_feature_quota(sb
))
3692 sb
->s_qcop
= &dquot_quotactl_sysfile_ops
;
3694 sb
->s_qcop
= &ext4_qctl_operations
;
3695 sb
->s_quota_types
= QTYPE_MASK_USR
| QTYPE_MASK_GRP
| QTYPE_MASK_PRJ
;
3697 memcpy(sb
->s_uuid
, es
->s_uuid
, sizeof(es
->s_uuid
));
3699 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
3700 mutex_init(&sbi
->s_orphan_lock
);
3704 needs_recovery
= (es
->s_last_orphan
!= 0 ||
3705 ext4_has_feature_journal_needs_recovery(sb
));
3707 if (ext4_has_feature_mmp(sb
) && !(sb
->s_flags
& MS_RDONLY
))
3708 if (ext4_multi_mount_protect(sb
, le64_to_cpu(es
->s_mmp_block
)))
3709 goto failed_mount3a
;
3712 * The first inode we look at is the journal inode. Don't try
3713 * root first: it may be modified in the journal!
3715 if (!test_opt(sb
, NOLOAD
) && ext4_has_feature_journal(sb
)) {
3716 if (ext4_load_journal(sb
, es
, journal_devnum
))
3717 goto failed_mount3a
;
3718 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
3719 ext4_has_feature_journal_needs_recovery(sb
)) {
3720 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
3721 "suppressed and not mounted read-only");
3722 goto failed_mount_wq
;
3724 /* Nojournal mode, all journal mount options are illegal */
3725 if (test_opt2(sb
, EXPLICIT_JOURNAL_CHECKSUM
)) {
3726 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3727 "journal_checksum, fs mounted w/o journal");
3728 goto failed_mount_wq
;
3730 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
3731 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3732 "journal_async_commit, fs mounted w/o journal");
3733 goto failed_mount_wq
;
3735 if (sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
) {
3736 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3737 "commit=%lu, fs mounted w/o journal",
3738 sbi
->s_commit_interval
/ HZ
);
3739 goto failed_mount_wq
;
3741 if (EXT4_MOUNT_DATA_FLAGS
&
3742 (sbi
->s_mount_opt
^ sbi
->s_def_mount_opt
)) {
3743 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3744 "data=, fs mounted w/o journal");
3745 goto failed_mount_wq
;
3747 sbi
->s_def_mount_opt
&= EXT4_MOUNT_JOURNAL_CHECKSUM
;
3748 clear_opt(sb
, JOURNAL_CHECKSUM
);
3749 clear_opt(sb
, DATA_FLAGS
);
3750 sbi
->s_journal
= NULL
;
3755 if (ext4_has_feature_64bit(sb
) &&
3756 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
3757 JBD2_FEATURE_INCOMPAT_64BIT
)) {
3758 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
3759 goto failed_mount_wq
;
3762 if (!set_journal_csum_feature_set(sb
)) {
3763 ext4_msg(sb
, KERN_ERR
, "Failed to set journal checksum "
3765 goto failed_mount_wq
;
3768 /* We have now updated the journal if required, so we can
3769 * validate the data journaling mode. */
3770 switch (test_opt(sb
, DATA_FLAGS
)) {
3772 /* No mode set, assume a default based on the journal
3773 * capabilities: ORDERED_DATA if the journal can
3774 * cope, else JOURNAL_DATA
3776 if (jbd2_journal_check_available_features
3777 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
3778 set_opt(sb
, ORDERED_DATA
);
3780 set_opt(sb
, JOURNAL_DATA
);
3783 case EXT4_MOUNT_ORDERED_DATA
:
3784 case EXT4_MOUNT_WRITEBACK_DATA
:
3785 if (!jbd2_journal_check_available_features
3786 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
3787 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
3788 "requested data journaling mode");
3789 goto failed_mount_wq
;
3794 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
3796 sbi
->s_journal
->j_commit_callback
= ext4_journal_commit_callback
;
3799 sbi
->s_mb_cache
= ext4_xattr_create_cache();
3800 if (!sbi
->s_mb_cache
) {
3801 ext4_msg(sb
, KERN_ERR
, "Failed to create an mb_cache");
3802 goto failed_mount_wq
;
3805 if ((DUMMY_ENCRYPTION_ENABLED(sbi
) || ext4_has_feature_encrypt(sb
)) &&
3806 (blocksize
!= PAGE_SIZE
)) {
3807 ext4_msg(sb
, KERN_ERR
,
3808 "Unsupported blocksize for fs encryption");
3809 goto failed_mount_wq
;
3812 if (DUMMY_ENCRYPTION_ENABLED(sbi
) && !(sb
->s_flags
& MS_RDONLY
) &&
3813 !ext4_has_feature_encrypt(sb
)) {
3814 ext4_set_feature_encrypt(sb
);
3815 ext4_commit_super(sb
, 1);
3819 * Get the # of file system overhead blocks from the
3820 * superblock if present.
3822 if (es
->s_overhead_clusters
)
3823 sbi
->s_overhead
= le32_to_cpu(es
->s_overhead_clusters
);
3825 err
= ext4_calculate_overhead(sb
);
3827 goto failed_mount_wq
;
3831 * The maximum number of concurrent works can be high and
3832 * concurrency isn't really necessary. Limit it to 1.
3834 EXT4_SB(sb
)->rsv_conversion_wq
=
3835 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM
| WQ_UNBOUND
, 1);
3836 if (!EXT4_SB(sb
)->rsv_conversion_wq
) {
3837 printk(KERN_ERR
"EXT4-fs: failed to create workqueue\n");
3843 * The jbd2_journal_load will have done any necessary log recovery,
3844 * so we can safely mount the rest of the filesystem now.
3847 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
3849 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
3850 ret
= PTR_ERR(root
);
3854 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
3855 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
3859 sb
->s_root
= d_make_root(root
);
3861 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
3866 if (ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
))
3867 sb
->s_flags
|= MS_RDONLY
;
3869 /* determine the minimum size of new large inodes, if present */
3870 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
3871 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
3872 EXT4_GOOD_OLD_INODE_SIZE
;
3873 if (ext4_has_feature_extra_isize(sb
)) {
3874 if (sbi
->s_want_extra_isize
<
3875 le16_to_cpu(es
->s_want_extra_isize
))
3876 sbi
->s_want_extra_isize
=
3877 le16_to_cpu(es
->s_want_extra_isize
);
3878 if (sbi
->s_want_extra_isize
<
3879 le16_to_cpu(es
->s_min_extra_isize
))
3880 sbi
->s_want_extra_isize
=
3881 le16_to_cpu(es
->s_min_extra_isize
);
3884 /* Check if enough inode space is available */
3885 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
3886 sbi
->s_inode_size
) {
3887 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
3888 EXT4_GOOD_OLD_INODE_SIZE
;
3889 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
3893 ext4_set_resv_clusters(sb
);
3895 err
= ext4_setup_system_zone(sb
);
3897 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
3899 goto failed_mount4a
;
3903 err
= ext4_mb_init(sb
);
3905 ext4_msg(sb
, KERN_ERR
, "failed to initialize mballoc (%d)",
3910 block
= ext4_count_free_clusters(sb
);
3911 ext4_free_blocks_count_set(sbi
->s_es
,
3912 EXT4_C2B(sbi
, block
));
3913 err
= percpu_counter_init(&sbi
->s_freeclusters_counter
, block
,
3916 unsigned long freei
= ext4_count_free_inodes(sb
);
3917 sbi
->s_es
->s_free_inodes_count
= cpu_to_le32(freei
);
3918 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
, freei
,
3922 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
3923 ext4_count_dirs(sb
), GFP_KERNEL
);
3925 err
= percpu_counter_init(&sbi
->s_dirtyclusters_counter
, 0,
3928 err
= percpu_init_rwsem(&sbi
->s_journal_flag_rwsem
);
3931 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
3935 if (ext4_has_feature_flex_bg(sb
))
3936 if (!ext4_fill_flex_info(sb
)) {
3937 ext4_msg(sb
, KERN_ERR
,
3938 "unable to initialize "
3939 "flex_bg meta info!");
3943 err
= ext4_register_li_request(sb
, first_not_zeroed
);
3947 err
= ext4_register_sysfs(sb
);
3952 /* Enable quota usage during mount. */
3953 if (ext4_has_feature_quota(sb
) && !(sb
->s_flags
& MS_RDONLY
)) {
3954 err
= ext4_enable_quotas(sb
);
3958 #endif /* CONFIG_QUOTA */
3960 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
3961 ext4_orphan_cleanup(sb
, es
);
3962 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
3963 if (needs_recovery
) {
3964 ext4_msg(sb
, KERN_INFO
, "recovery complete");
3965 ext4_mark_recovery_complete(sb
, es
);
3967 if (EXT4_SB(sb
)->s_journal
) {
3968 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
3969 descr
= " journalled data mode";
3970 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
3971 descr
= " ordered data mode";
3973 descr
= " writeback data mode";
3975 descr
= "out journal";
3977 if (test_opt(sb
, DISCARD
)) {
3978 struct request_queue
*q
= bdev_get_queue(sb
->s_bdev
);
3979 if (!blk_queue_discard(q
))
3980 ext4_msg(sb
, KERN_WARNING
,
3981 "mounting with \"discard\" option, but "
3982 "the device does not support discard");
3985 if (___ratelimit(&ext4_mount_msg_ratelimit
, "EXT4-fs mount"))
3986 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s. "
3987 "Opts: %s%s%s", descr
, sbi
->s_es
->s_mount_opts
,
3988 *sbi
->s_es
->s_mount_opts
? "; " : "", orig_data
);
3990 if (es
->s_error_count
)
3991 mod_timer(&sbi
->s_err_report
, jiffies
+ 300*HZ
); /* 5 minutes */
3993 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
3994 ratelimit_state_init(&sbi
->s_err_ratelimit_state
, 5 * HZ
, 10);
3995 ratelimit_state_init(&sbi
->s_warning_ratelimit_state
, 5 * HZ
, 10);
3996 ratelimit_state_init(&sbi
->s_msg_ratelimit_state
, 5 * HZ
, 10);
4003 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
4008 ext4_unregister_sysfs(sb
);
4011 ext4_unregister_li_request(sb
);
4013 ext4_mb_release(sb
);
4014 if (sbi
->s_flex_groups
)
4015 kvfree(sbi
->s_flex_groups
);
4016 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
4017 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
4018 percpu_counter_destroy(&sbi
->s_dirs_counter
);
4019 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
4021 ext4_ext_release(sb
);
4022 ext4_release_system_zone(sb
);
4027 ext4_msg(sb
, KERN_ERR
, "mount failed");
4028 if (EXT4_SB(sb
)->rsv_conversion_wq
)
4029 destroy_workqueue(EXT4_SB(sb
)->rsv_conversion_wq
);
4031 if (sbi
->s_mb_cache
) {
4032 ext4_xattr_destroy_cache(sbi
->s_mb_cache
);
4033 sbi
->s_mb_cache
= NULL
;
4035 if (sbi
->s_journal
) {
4036 jbd2_journal_destroy(sbi
->s_journal
);
4037 sbi
->s_journal
= NULL
;
4040 ext4_es_unregister_shrinker(sbi
);
4042 del_timer_sync(&sbi
->s_err_report
);
4044 kthread_stop(sbi
->s_mmp_tsk
);
4046 for (i
= 0; i
< db_count
; i
++)
4047 brelse(sbi
->s_group_desc
[i
]);
4048 kvfree(sbi
->s_group_desc
);
4050 if (sbi
->s_chksum_driver
)
4051 crypto_free_shash(sbi
->s_chksum_driver
);
4053 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
4054 kfree(sbi
->s_qf_names
[i
]);
4056 ext4_blkdev_remove(sbi
);
4059 sb
->s_fs_info
= NULL
;
4060 kfree(sbi
->s_blockgroup_lock
);
4064 return err
? err
: ret
;
4068 * Setup any per-fs journal parameters now. We'll do this both on
4069 * initial mount, once the journal has been initialised but before we've
4070 * done any recovery; and again on any subsequent remount.
4072 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
4074 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4076 journal
->j_commit_interval
= sbi
->s_commit_interval
;
4077 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
4078 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
4080 write_lock(&journal
->j_state_lock
);
4081 if (test_opt(sb
, BARRIER
))
4082 journal
->j_flags
|= JBD2_BARRIER
;
4084 journal
->j_flags
&= ~JBD2_BARRIER
;
4085 if (test_opt(sb
, DATA_ERR_ABORT
))
4086 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
4088 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
4089 write_unlock(&journal
->j_state_lock
);
4092 static journal_t
*ext4_get_journal(struct super_block
*sb
,
4093 unsigned int journal_inum
)
4095 struct inode
*journal_inode
;
4098 BUG_ON(!ext4_has_feature_journal(sb
));
4100 /* First, test for the existence of a valid inode on disk. Bad
4101 * things happen if we iget() an unused inode, as the subsequent
4102 * iput() will try to delete it. */
4104 journal_inode
= ext4_iget(sb
, journal_inum
);
4105 if (IS_ERR(journal_inode
)) {
4106 ext4_msg(sb
, KERN_ERR
, "no journal found");
4109 if (!journal_inode
->i_nlink
) {
4110 make_bad_inode(journal_inode
);
4111 iput(journal_inode
);
4112 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
4116 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4117 journal_inode
, journal_inode
->i_size
);
4118 if (!S_ISREG(journal_inode
->i_mode
)) {
4119 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
4120 iput(journal_inode
);
4124 journal
= jbd2_journal_init_inode(journal_inode
);
4126 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
4127 iput(journal_inode
);
4130 journal
->j_private
= sb
;
4131 ext4_init_journal_params(sb
, journal
);
4135 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
4138 struct buffer_head
*bh
;
4142 int hblock
, blocksize
;
4143 ext4_fsblk_t sb_block
;
4144 unsigned long offset
;
4145 struct ext4_super_block
*es
;
4146 struct block_device
*bdev
;
4148 BUG_ON(!ext4_has_feature_journal(sb
));
4150 bdev
= ext4_blkdev_get(j_dev
, sb
);
4154 blocksize
= sb
->s_blocksize
;
4155 hblock
= bdev_logical_block_size(bdev
);
4156 if (blocksize
< hblock
) {
4157 ext4_msg(sb
, KERN_ERR
,
4158 "blocksize too small for journal device");
4162 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
4163 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
4164 set_blocksize(bdev
, blocksize
);
4165 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
4166 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
4167 "external journal");
4171 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
4172 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
4173 !(le32_to_cpu(es
->s_feature_incompat
) &
4174 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
4175 ext4_msg(sb
, KERN_ERR
, "external journal has "
4181 if ((le32_to_cpu(es
->s_feature_ro_compat
) &
4182 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
) &&
4183 es
->s_checksum
!= ext4_superblock_csum(sb
, es
)) {
4184 ext4_msg(sb
, KERN_ERR
, "external journal has "
4185 "corrupt superblock");
4190 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
4191 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
4196 len
= ext4_blocks_count(es
);
4197 start
= sb_block
+ 1;
4198 brelse(bh
); /* we're done with the superblock */
4200 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
4201 start
, len
, blocksize
);
4203 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
4206 journal
->j_private
= sb
;
4207 ll_rw_block(READ
| REQ_META
| REQ_PRIO
, 1, &journal
->j_sb_buffer
);
4208 wait_on_buffer(journal
->j_sb_buffer
);
4209 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
4210 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
4213 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
4214 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
4215 "user (unsupported) - %d",
4216 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
4219 EXT4_SB(sb
)->journal_bdev
= bdev
;
4220 ext4_init_journal_params(sb
, journal
);
4224 jbd2_journal_destroy(journal
);
4226 ext4_blkdev_put(bdev
);
4230 static int ext4_load_journal(struct super_block
*sb
,
4231 struct ext4_super_block
*es
,
4232 unsigned long journal_devnum
)
4235 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
4238 int really_read_only
;
4240 BUG_ON(!ext4_has_feature_journal(sb
));
4242 if (journal_devnum
&&
4243 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4244 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
4245 "numbers have changed");
4246 journal_dev
= new_decode_dev(journal_devnum
);
4248 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
4250 really_read_only
= bdev_read_only(sb
->s_bdev
);
4253 * Are we loading a blank journal or performing recovery after a
4254 * crash? For recovery, we need to check in advance whether we
4255 * can get read-write access to the device.
4257 if (ext4_has_feature_journal_needs_recovery(sb
)) {
4258 if (sb
->s_flags
& MS_RDONLY
) {
4259 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
4260 "required on readonly filesystem");
4261 if (really_read_only
) {
4262 ext4_msg(sb
, KERN_ERR
, "write access "
4263 "unavailable, cannot proceed");
4266 ext4_msg(sb
, KERN_INFO
, "write access will "
4267 "be enabled during recovery");
4271 if (journal_inum
&& journal_dev
) {
4272 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
4273 "and inode journals!");
4278 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
4281 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
4285 if (!(journal
->j_flags
& JBD2_BARRIER
))
4286 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
4288 if (!ext4_has_feature_journal_needs_recovery(sb
))
4289 err
= jbd2_journal_wipe(journal
, !really_read_only
);
4291 char *save
= kmalloc(EXT4_S_ERR_LEN
, GFP_KERNEL
);
4293 memcpy(save
, ((char *) es
) +
4294 EXT4_S_ERR_START
, EXT4_S_ERR_LEN
);
4295 err
= jbd2_journal_load(journal
);
4297 memcpy(((char *) es
) + EXT4_S_ERR_START
,
4298 save
, EXT4_S_ERR_LEN
);
4303 ext4_msg(sb
, KERN_ERR
, "error loading journal");
4304 jbd2_journal_destroy(journal
);
4308 EXT4_SB(sb
)->s_journal
= journal
;
4309 ext4_clear_journal_err(sb
, es
);
4311 if (!really_read_only
&& journal_devnum
&&
4312 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4313 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
4315 /* Make sure we flush the recovery flag to disk. */
4316 ext4_commit_super(sb
, 1);
4322 static int ext4_commit_super(struct super_block
*sb
, int sync
)
4324 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
4325 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
4328 if (!sbh
|| block_device_ejected(sb
))
4330 if (buffer_write_io_error(sbh
)) {
4332 * Oh, dear. A previous attempt to write the
4333 * superblock failed. This could happen because the
4334 * USB device was yanked out. Or it could happen to
4335 * be a transient write error and maybe the block will
4336 * be remapped. Nothing we can do but to retry the
4337 * write and hope for the best.
4339 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
4340 "superblock detected");
4341 clear_buffer_write_io_error(sbh
);
4342 set_buffer_uptodate(sbh
);
4345 * If the file system is mounted read-only, don't update the
4346 * superblock write time. This avoids updating the superblock
4347 * write time when we are mounting the root file system
4348 * read/only but we need to replay the journal; at that point,
4349 * for people who are east of GMT and who make their clock
4350 * tick in localtime for Windows bug-for-bug compatibility,
4351 * the clock is set in the future, and this will cause e2fsck
4352 * to complain and force a full file system check.
4354 if (!(sb
->s_flags
& MS_RDONLY
))
4355 es
->s_wtime
= cpu_to_le32(get_seconds());
4356 if (sb
->s_bdev
->bd_part
)
4357 es
->s_kbytes_written
=
4358 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
4359 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
4360 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
4362 es
->s_kbytes_written
=
4363 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
);
4364 if (percpu_counter_initialized(&EXT4_SB(sb
)->s_freeclusters_counter
))
4365 ext4_free_blocks_count_set(es
,
4366 EXT4_C2B(EXT4_SB(sb
), percpu_counter_sum_positive(
4367 &EXT4_SB(sb
)->s_freeclusters_counter
)));
4368 if (percpu_counter_initialized(&EXT4_SB(sb
)->s_freeinodes_counter
))
4369 es
->s_free_inodes_count
=
4370 cpu_to_le32(percpu_counter_sum_positive(
4371 &EXT4_SB(sb
)->s_freeinodes_counter
));
4372 BUFFER_TRACE(sbh
, "marking dirty");
4373 ext4_superblock_csum_set(sb
);
4374 mark_buffer_dirty(sbh
);
4376 error
= __sync_dirty_buffer(sbh
,
4377 test_opt(sb
, BARRIER
) ? WRITE_FUA
: WRITE_SYNC
);
4381 error
= buffer_write_io_error(sbh
);
4383 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
4385 clear_buffer_write_io_error(sbh
);
4386 set_buffer_uptodate(sbh
);
4393 * Have we just finished recovery? If so, and if we are mounting (or
4394 * remounting) the filesystem readonly, then we will end up with a
4395 * consistent fs on disk. Record that fact.
4397 static void ext4_mark_recovery_complete(struct super_block
*sb
,
4398 struct ext4_super_block
*es
)
4400 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
4402 if (!ext4_has_feature_journal(sb
)) {
4403 BUG_ON(journal
!= NULL
);
4406 jbd2_journal_lock_updates(journal
);
4407 if (jbd2_journal_flush(journal
) < 0)
4410 if (ext4_has_feature_journal_needs_recovery(sb
) &&
4411 sb
->s_flags
& MS_RDONLY
) {
4412 ext4_clear_feature_journal_needs_recovery(sb
);
4413 ext4_commit_super(sb
, 1);
4417 jbd2_journal_unlock_updates(journal
);
4421 * If we are mounting (or read-write remounting) a filesystem whose journal
4422 * has recorded an error from a previous lifetime, move that error to the
4423 * main filesystem now.
4425 static void ext4_clear_journal_err(struct super_block
*sb
,
4426 struct ext4_super_block
*es
)
4432 BUG_ON(!ext4_has_feature_journal(sb
));
4434 journal
= EXT4_SB(sb
)->s_journal
;
4437 * Now check for any error status which may have been recorded in the
4438 * journal by a prior ext4_error() or ext4_abort()
4441 j_errno
= jbd2_journal_errno(journal
);
4445 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
4446 ext4_warning(sb
, "Filesystem error recorded "
4447 "from previous mount: %s", errstr
);
4448 ext4_warning(sb
, "Marking fs in need of filesystem check.");
4450 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
4451 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
4452 ext4_commit_super(sb
, 1);
4454 jbd2_journal_clear_err(journal
);
4455 jbd2_journal_update_sb_errno(journal
);
4460 * Force the running and committing transactions to commit,
4461 * and wait on the commit.
4463 int ext4_force_commit(struct super_block
*sb
)
4467 if (sb
->s_flags
& MS_RDONLY
)
4470 journal
= EXT4_SB(sb
)->s_journal
;
4471 return ext4_journal_force_commit(journal
);
4474 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
4478 bool needs_barrier
= false;
4479 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4481 trace_ext4_sync_fs(sb
, wait
);
4482 flush_workqueue(sbi
->rsv_conversion_wq
);
4484 * Writeback quota in non-journalled quota case - journalled quota has
4487 dquot_writeback_dquots(sb
, -1);
4489 * Data writeback is possible w/o journal transaction, so barrier must
4490 * being sent at the end of the function. But we can skip it if
4491 * transaction_commit will do it for us.
4493 if (sbi
->s_journal
) {
4494 target
= jbd2_get_latest_transaction(sbi
->s_journal
);
4495 if (wait
&& sbi
->s_journal
->j_flags
& JBD2_BARRIER
&&
4496 !jbd2_trans_will_send_data_barrier(sbi
->s_journal
, target
))
4497 needs_barrier
= true;
4499 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
4501 ret
= jbd2_log_wait_commit(sbi
->s_journal
,
4504 } else if (wait
&& test_opt(sb
, BARRIER
))
4505 needs_barrier
= true;
4506 if (needs_barrier
) {
4508 err
= blkdev_issue_flush(sb
->s_bdev
, GFP_KERNEL
, NULL
);
4517 * LVM calls this function before a (read-only) snapshot is created. This
4518 * gives us a chance to flush the journal completely and mark the fs clean.
4520 * Note that only this function cannot bring a filesystem to be in a clean
4521 * state independently. It relies on upper layer to stop all data & metadata
4524 static int ext4_freeze(struct super_block
*sb
)
4529 if (sb
->s_flags
& MS_RDONLY
)
4532 journal
= EXT4_SB(sb
)->s_journal
;
4535 /* Now we set up the journal barrier. */
4536 jbd2_journal_lock_updates(journal
);
4539 * Don't clear the needs_recovery flag if we failed to
4540 * flush the journal.
4542 error
= jbd2_journal_flush(journal
);
4546 /* Journal blocked and flushed, clear needs_recovery flag. */
4547 ext4_clear_feature_journal_needs_recovery(sb
);
4550 error
= ext4_commit_super(sb
, 1);
4553 /* we rely on upper layer to stop further updates */
4554 jbd2_journal_unlock_updates(journal
);
4559 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4560 * flag here, even though the filesystem is not technically dirty yet.
4562 static int ext4_unfreeze(struct super_block
*sb
)
4564 if (sb
->s_flags
& MS_RDONLY
)
4567 if (EXT4_SB(sb
)->s_journal
) {
4568 /* Reset the needs_recovery flag before the fs is unlocked. */
4569 ext4_set_feature_journal_needs_recovery(sb
);
4572 ext4_commit_super(sb
, 1);
4577 * Structure to save mount options for ext4_remount's benefit
4579 struct ext4_mount_options
{
4580 unsigned long s_mount_opt
;
4581 unsigned long s_mount_opt2
;
4584 unsigned long s_commit_interval
;
4585 u32 s_min_batch_time
, s_max_batch_time
;
4588 char *s_qf_names
[EXT4_MAXQUOTAS
];
4592 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
4594 struct ext4_super_block
*es
;
4595 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4596 unsigned long old_sb_flags
;
4597 struct ext4_mount_options old_opts
;
4598 int enable_quota
= 0;
4600 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
4605 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
4607 /* Store the original options */
4608 old_sb_flags
= sb
->s_flags
;
4609 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
4610 old_opts
.s_mount_opt2
= sbi
->s_mount_opt2
;
4611 old_opts
.s_resuid
= sbi
->s_resuid
;
4612 old_opts
.s_resgid
= sbi
->s_resgid
;
4613 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
4614 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
4615 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
4617 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
4618 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
4619 if (sbi
->s_qf_names
[i
]) {
4620 old_opts
.s_qf_names
[i
] = kstrdup(sbi
->s_qf_names
[i
],
4622 if (!old_opts
.s_qf_names
[i
]) {
4623 for (j
= 0; j
< i
; j
++)
4624 kfree(old_opts
.s_qf_names
[j
]);
4629 old_opts
.s_qf_names
[i
] = NULL
;
4631 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
4632 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
4634 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
, 1)) {
4639 if ((old_opts
.s_mount_opt
& EXT4_MOUNT_JOURNAL_CHECKSUM
) ^
4640 test_opt(sb
, JOURNAL_CHECKSUM
)) {
4641 ext4_msg(sb
, KERN_ERR
, "changing journal_checksum "
4642 "during remount not supported; ignoring");
4643 sbi
->s_mount_opt
^= EXT4_MOUNT_JOURNAL_CHECKSUM
;
4646 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
4647 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
4648 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4649 "both data=journal and delalloc");
4653 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
4654 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4655 "both data=journal and dioread_nolock");
4659 if (test_opt(sb
, DAX
)) {
4660 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4661 "both data=journal and dax");
4667 if ((sbi
->s_mount_opt
^ old_opts
.s_mount_opt
) & EXT4_MOUNT_DAX
) {
4668 ext4_msg(sb
, KERN_WARNING
, "warning: refusing change of "
4669 "dax flag with busy inodes while remounting");
4670 sbi
->s_mount_opt
^= EXT4_MOUNT_DAX
;
4673 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
4674 ext4_abort(sb
, "Abort forced by user");
4676 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
4677 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
4681 if (sbi
->s_journal
) {
4682 ext4_init_journal_params(sb
, sbi
->s_journal
);
4683 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
4686 if (*flags
& MS_LAZYTIME
)
4687 sb
->s_flags
|= MS_LAZYTIME
;
4689 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
)) {
4690 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
4695 if (*flags
& MS_RDONLY
) {
4696 err
= sync_filesystem(sb
);
4699 err
= dquot_suspend(sb
, -1);
4704 * First of all, the unconditional stuff we have to do
4705 * to disable replay of the journal when we next remount
4707 sb
->s_flags
|= MS_RDONLY
;
4710 * OK, test if we are remounting a valid rw partition
4711 * readonly, and if so set the rdonly flag and then
4712 * mark the partition as valid again.
4714 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
4715 (sbi
->s_mount_state
& EXT4_VALID_FS
))
4716 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
4719 ext4_mark_recovery_complete(sb
, es
);
4721 /* Make sure we can mount this feature set readwrite */
4722 if (ext4_has_feature_readonly(sb
) ||
4723 !ext4_feature_set_ok(sb
, 0)) {
4728 * Make sure the group descriptor checksums
4729 * are sane. If they aren't, refuse to remount r/w.
4731 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
4732 struct ext4_group_desc
*gdp
=
4733 ext4_get_group_desc(sb
, g
, NULL
);
4735 if (!ext4_group_desc_csum_verify(sb
, g
, gdp
)) {
4736 ext4_msg(sb
, KERN_ERR
,
4737 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4738 g
, le16_to_cpu(ext4_group_desc_csum(sb
, g
, gdp
)),
4739 le16_to_cpu(gdp
->bg_checksum
));
4746 * If we have an unprocessed orphan list hanging
4747 * around from a previously readonly bdev mount,
4748 * require a full umount/remount for now.
4750 if (es
->s_last_orphan
) {
4751 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
4752 "remount RDWR because of unprocessed "
4753 "orphan inode list. Please "
4754 "umount/remount instead");
4760 * Mounting a RDONLY partition read-write, so reread
4761 * and store the current valid flag. (It may have
4762 * been changed by e2fsck since we originally mounted
4766 ext4_clear_journal_err(sb
, es
);
4767 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
4768 if (!ext4_setup_super(sb
, es
, 0))
4769 sb
->s_flags
&= ~MS_RDONLY
;
4770 if (ext4_has_feature_mmp(sb
))
4771 if (ext4_multi_mount_protect(sb
,
4772 le64_to_cpu(es
->s_mmp_block
))) {
4781 * Reinitialize lazy itable initialization thread based on
4784 if ((sb
->s_flags
& MS_RDONLY
) || !test_opt(sb
, INIT_INODE_TABLE
))
4785 ext4_unregister_li_request(sb
);
4787 ext4_group_t first_not_zeroed
;
4788 first_not_zeroed
= ext4_has_uninit_itable(sb
);
4789 ext4_register_li_request(sb
, first_not_zeroed
);
4792 ext4_setup_system_zone(sb
);
4793 if (sbi
->s_journal
== NULL
&& !(old_sb_flags
& MS_RDONLY
))
4794 ext4_commit_super(sb
, 1);
4797 /* Release old quota file names */
4798 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
4799 kfree(old_opts
.s_qf_names
[i
]);
4801 if (sb_any_quota_suspended(sb
))
4802 dquot_resume(sb
, -1);
4803 else if (ext4_has_feature_quota(sb
)) {
4804 err
= ext4_enable_quotas(sb
);
4811 *flags
= (*flags
& ~MS_LAZYTIME
) | (sb
->s_flags
& MS_LAZYTIME
);
4812 ext4_msg(sb
, KERN_INFO
, "re-mounted. Opts: %s", orig_data
);
4817 sb
->s_flags
= old_sb_flags
;
4818 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
4819 sbi
->s_mount_opt2
= old_opts
.s_mount_opt2
;
4820 sbi
->s_resuid
= old_opts
.s_resuid
;
4821 sbi
->s_resgid
= old_opts
.s_resgid
;
4822 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
4823 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
4824 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
4826 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
4827 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++) {
4828 kfree(sbi
->s_qf_names
[i
]);
4829 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
4837 static int ext4_statfs_project(struct super_block
*sb
,
4838 kprojid_t projid
, struct kstatfs
*buf
)
4841 struct dquot
*dquot
;
4845 qid
= make_kqid_projid(projid
);
4846 dquot
= dqget(sb
, qid
);
4848 return PTR_ERR(dquot
);
4849 spin_lock(&dq_data_lock
);
4851 limit
= (dquot
->dq_dqb
.dqb_bsoftlimit
?
4852 dquot
->dq_dqb
.dqb_bsoftlimit
:
4853 dquot
->dq_dqb
.dqb_bhardlimit
) >> sb
->s_blocksize_bits
;
4854 if (limit
&& buf
->f_blocks
> limit
) {
4855 curblock
= dquot
->dq_dqb
.dqb_curspace
>> sb
->s_blocksize_bits
;
4856 buf
->f_blocks
= limit
;
4857 buf
->f_bfree
= buf
->f_bavail
=
4858 (buf
->f_blocks
> curblock
) ?
4859 (buf
->f_blocks
- curblock
) : 0;
4862 limit
= dquot
->dq_dqb
.dqb_isoftlimit
?
4863 dquot
->dq_dqb
.dqb_isoftlimit
:
4864 dquot
->dq_dqb
.dqb_ihardlimit
;
4865 if (limit
&& buf
->f_files
> limit
) {
4866 buf
->f_files
= limit
;
4868 (buf
->f_files
> dquot
->dq_dqb
.dqb_curinodes
) ?
4869 (buf
->f_files
- dquot
->dq_dqb
.dqb_curinodes
) : 0;
4872 spin_unlock(&dq_data_lock
);
4878 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
4880 struct super_block
*sb
= dentry
->d_sb
;
4881 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4882 struct ext4_super_block
*es
= sbi
->s_es
;
4883 ext4_fsblk_t overhead
= 0, resv_blocks
;
4886 resv_blocks
= EXT4_C2B(sbi
, atomic64_read(&sbi
->s_resv_clusters
));
4888 if (!test_opt(sb
, MINIX_DF
))
4889 overhead
= sbi
->s_overhead
;
4891 buf
->f_type
= EXT4_SUPER_MAGIC
;
4892 buf
->f_bsize
= sb
->s_blocksize
;
4893 buf
->f_blocks
= ext4_blocks_count(es
) - EXT4_C2B(sbi
, overhead
);
4894 bfree
= percpu_counter_sum_positive(&sbi
->s_freeclusters_counter
) -
4895 percpu_counter_sum_positive(&sbi
->s_dirtyclusters_counter
);
4896 /* prevent underflow in case that few free space is available */
4897 buf
->f_bfree
= EXT4_C2B(sbi
, max_t(s64
, bfree
, 0));
4898 buf
->f_bavail
= buf
->f_bfree
-
4899 (ext4_r_blocks_count(es
) + resv_blocks
);
4900 if (buf
->f_bfree
< (ext4_r_blocks_count(es
) + resv_blocks
))
4902 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
4903 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
4904 buf
->f_namelen
= EXT4_NAME_LEN
;
4905 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
4906 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
4907 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
4908 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
4911 if (ext4_test_inode_flag(dentry
->d_inode
, EXT4_INODE_PROJINHERIT
) &&
4912 sb_has_quota_limits_enabled(sb
, PRJQUOTA
))
4913 ext4_statfs_project(sb
, EXT4_I(dentry
->d_inode
)->i_projid
, buf
);
4918 /* Helper function for writing quotas on sync - we need to start transaction
4919 * before quota file is locked for write. Otherwise the are possible deadlocks:
4920 * Process 1 Process 2
4921 * ext4_create() quota_sync()
4922 * jbd2_journal_start() write_dquot()
4923 * dquot_initialize() down(dqio_mutex)
4924 * down(dqio_mutex) jbd2_journal_start()
4930 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
4932 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_id
.type
];
4935 static int ext4_write_dquot(struct dquot
*dquot
)
4939 struct inode
*inode
;
4941 inode
= dquot_to_inode(dquot
);
4942 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
,
4943 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
4945 return PTR_ERR(handle
);
4946 ret
= dquot_commit(dquot
);
4947 err
= ext4_journal_stop(handle
);
4953 static int ext4_acquire_dquot(struct dquot
*dquot
)
4958 handle
= ext4_journal_start(dquot_to_inode(dquot
), EXT4_HT_QUOTA
,
4959 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
4961 return PTR_ERR(handle
);
4962 ret
= dquot_acquire(dquot
);
4963 err
= ext4_journal_stop(handle
);
4969 static int ext4_release_dquot(struct dquot
*dquot
)
4974 handle
= ext4_journal_start(dquot_to_inode(dquot
), EXT4_HT_QUOTA
,
4975 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
4976 if (IS_ERR(handle
)) {
4977 /* Release dquot anyway to avoid endless cycle in dqput() */
4978 dquot_release(dquot
);
4979 return PTR_ERR(handle
);
4981 ret
= dquot_release(dquot
);
4982 err
= ext4_journal_stop(handle
);
4988 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
4990 struct super_block
*sb
= dquot
->dq_sb
;
4991 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4993 /* Are we journaling quotas? */
4994 if (ext4_has_feature_quota(sb
) ||
4995 sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
4996 dquot_mark_dquot_dirty(dquot
);
4997 return ext4_write_dquot(dquot
);
4999 return dquot_mark_dquot_dirty(dquot
);
5003 static int ext4_write_info(struct super_block
*sb
, int type
)
5008 /* Data block + inode block */
5009 handle
= ext4_journal_start(d_inode(sb
->s_root
), EXT4_HT_QUOTA
, 2);
5011 return PTR_ERR(handle
);
5012 ret
= dquot_commit_info(sb
, type
);
5013 err
= ext4_journal_stop(handle
);
5020 * Turn on quotas during mount time - we need to find
5021 * the quota file and such...
5023 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
5025 return dquot_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
5026 EXT4_SB(sb
)->s_jquota_fmt
, type
);
5029 static void lockdep_set_quota_inode(struct inode
*inode
, int subclass
)
5031 struct ext4_inode_info
*ei
= EXT4_I(inode
);
5033 /* The first argument of lockdep_set_subclass has to be
5034 * *exactly* the same as the argument to init_rwsem() --- in
5035 * this case, in init_once() --- or lockdep gets unhappy
5036 * because the name of the lock is set using the
5037 * stringification of the argument to init_rwsem().
5039 (void) ei
; /* shut up clang warning if !CONFIG_LOCKDEP */
5040 lockdep_set_subclass(&ei
->i_data_sem
, subclass
);
5044 * Standard function to be called on quota_on
5046 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
5051 if (!test_opt(sb
, QUOTA
))
5054 /* Quotafile not on the same filesystem? */
5055 if (path
->dentry
->d_sb
!= sb
)
5057 /* Journaling quota? */
5058 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
5059 /* Quotafile not in fs root? */
5060 if (path
->dentry
->d_parent
!= sb
->s_root
)
5061 ext4_msg(sb
, KERN_WARNING
,
5062 "Quota file not on filesystem root. "
5063 "Journaled quota will not work");
5067 * When we journal data on quota file, we have to flush journal to see
5068 * all updates to the file when we bypass pagecache...
5070 if (EXT4_SB(sb
)->s_journal
&&
5071 ext4_should_journal_data(d_inode(path
->dentry
))) {
5073 * We don't need to lock updates but journal_flush() could
5074 * otherwise be livelocked...
5076 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
5077 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
5078 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
5082 lockdep_set_quota_inode(path
->dentry
->d_inode
, I_DATA_SEM_QUOTA
);
5083 err
= dquot_quota_on(sb
, type
, format_id
, path
);
5085 lockdep_set_quota_inode(path
->dentry
->d_inode
,
5090 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
5094 struct inode
*qf_inode
;
5095 unsigned long qf_inums
[EXT4_MAXQUOTAS
] = {
5096 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
5097 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
),
5098 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_prj_quota_inum
)
5101 BUG_ON(!ext4_has_feature_quota(sb
));
5103 if (!qf_inums
[type
])
5106 qf_inode
= ext4_iget(sb
, qf_inums
[type
]);
5107 if (IS_ERR(qf_inode
)) {
5108 ext4_error(sb
, "Bad quota inode # %lu", qf_inums
[type
]);
5109 return PTR_ERR(qf_inode
);
5112 /* Don't account quota for quota files to avoid recursion */
5113 qf_inode
->i_flags
|= S_NOQUOTA
;
5114 lockdep_set_quota_inode(qf_inode
, I_DATA_SEM_QUOTA
);
5115 err
= dquot_enable(qf_inode
, type
, format_id
, flags
);
5118 lockdep_set_quota_inode(qf_inode
, I_DATA_SEM_NORMAL
);
5123 /* Enable usage tracking for all quota types. */
5124 static int ext4_enable_quotas(struct super_block
*sb
)
5127 unsigned long qf_inums
[EXT4_MAXQUOTAS
] = {
5128 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
5129 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
),
5130 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_prj_quota_inum
)
5133 sb_dqopt(sb
)->flags
|= DQUOT_QUOTA_SYS_FILE
;
5134 for (type
= 0; type
< EXT4_MAXQUOTAS
; type
++) {
5135 if (qf_inums
[type
]) {
5136 err
= ext4_quota_enable(sb
, type
, QFMT_VFS_V1
,
5137 DQUOT_USAGE_ENABLED
);
5140 "Failed to enable quota tracking "
5141 "(type=%d, err=%d). Please run "
5142 "e2fsck to fix.", type
, err
);
5150 static int ext4_quota_off(struct super_block
*sb
, int type
)
5152 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5155 /* Force all delayed allocation blocks to be allocated.
5156 * Caller already holds s_umount sem */
5157 if (test_opt(sb
, DELALLOC
))
5158 sync_filesystem(sb
);
5163 /* Update modification times of quota files when userspace can
5164 * start looking at them */
5165 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
, 1);
5168 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
5169 ext4_mark_inode_dirty(handle
, inode
);
5170 ext4_journal_stop(handle
);
5173 return dquot_quota_off(sb
, type
);
5176 /* Read data from quotafile - avoid pagecache and such because we cannot afford
5177 * acquiring the locks... As quota files are never truncated and quota code
5178 * itself serializes the operations (and no one else should touch the files)
5179 * we don't have to be afraid of races */
5180 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
5181 size_t len
, loff_t off
)
5183 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5184 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5185 int offset
= off
& (sb
->s_blocksize
- 1);
5188 struct buffer_head
*bh
;
5189 loff_t i_size
= i_size_read(inode
);
5193 if (off
+len
> i_size
)
5196 while (toread
> 0) {
5197 tocopy
= sb
->s_blocksize
- offset
< toread
?
5198 sb
->s_blocksize
- offset
: toread
;
5199 bh
= ext4_bread(NULL
, inode
, blk
, 0);
5202 if (!bh
) /* A hole? */
5203 memset(data
, 0, tocopy
);
5205 memcpy(data
, bh
->b_data
+offset
, tocopy
);
5215 /* Write to quotafile (we know the transaction is already started and has
5216 * enough credits) */
5217 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
5218 const char *data
, size_t len
, loff_t off
)
5220 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5221 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5222 int err
, offset
= off
& (sb
->s_blocksize
- 1);
5224 struct buffer_head
*bh
;
5225 handle_t
*handle
= journal_current_handle();
5227 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
5228 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5229 " cancelled because transaction is not started",
5230 (unsigned long long)off
, (unsigned long long)len
);
5234 * Since we account only one data block in transaction credits,
5235 * then it is impossible to cross a block boundary.
5237 if (sb
->s_blocksize
- offset
< len
) {
5238 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5239 " cancelled because not block aligned",
5240 (unsigned long long)off
, (unsigned long long)len
);
5245 bh
= ext4_bread(handle
, inode
, blk
,
5246 EXT4_GET_BLOCKS_CREATE
|
5247 EXT4_GET_BLOCKS_METADATA_NOFAIL
);
5248 } while (IS_ERR(bh
) && (PTR_ERR(bh
) == -ENOSPC
) &&
5249 ext4_should_retry_alloc(inode
->i_sb
, &retries
));
5254 BUFFER_TRACE(bh
, "get write access");
5255 err
= ext4_journal_get_write_access(handle
, bh
);
5261 memcpy(bh
->b_data
+offset
, data
, len
);
5262 flush_dcache_page(bh
->b_page
);
5264 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
5267 if (inode
->i_size
< off
+ len
) {
5268 i_size_write(inode
, off
+ len
);
5269 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
5270 ext4_mark_inode_dirty(handle
, inode
);
5275 static int ext4_get_next_id(struct super_block
*sb
, struct kqid
*qid
)
5277 const struct quota_format_ops
*ops
;
5279 if (!sb_has_quota_loaded(sb
, qid
->type
))
5281 ops
= sb_dqopt(sb
)->ops
[qid
->type
];
5282 if (!ops
|| !ops
->get_next_id
)
5284 return dquot_get_next_id(sb
, qid
);
5288 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
5289 const char *dev_name
, void *data
)
5291 return mount_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
);
5294 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
5295 static inline void register_as_ext2(void)
5297 int err
= register_filesystem(&ext2_fs_type
);
5300 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
5303 static inline void unregister_as_ext2(void)
5305 unregister_filesystem(&ext2_fs_type
);
5308 static inline int ext2_feature_set_ok(struct super_block
*sb
)
5310 if (ext4_has_unknown_ext2_incompat_features(sb
))
5312 if (sb
->s_flags
& MS_RDONLY
)
5314 if (ext4_has_unknown_ext2_ro_compat_features(sb
))
5319 static inline void register_as_ext2(void) { }
5320 static inline void unregister_as_ext2(void) { }
5321 static inline int ext2_feature_set_ok(struct super_block
*sb
) { return 0; }
5324 static inline void register_as_ext3(void)
5326 int err
= register_filesystem(&ext3_fs_type
);
5329 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
5332 static inline void unregister_as_ext3(void)
5334 unregister_filesystem(&ext3_fs_type
);
5337 static inline int ext3_feature_set_ok(struct super_block
*sb
)
5339 if (ext4_has_unknown_ext3_incompat_features(sb
))
5341 if (!ext4_has_feature_journal(sb
))
5343 if (sb
->s_flags
& MS_RDONLY
)
5345 if (ext4_has_unknown_ext3_ro_compat_features(sb
))
5350 static struct file_system_type ext4_fs_type
= {
5351 .owner
= THIS_MODULE
,
5353 .mount
= ext4_mount
,
5354 .kill_sb
= kill_block_super
,
5355 .fs_flags
= FS_REQUIRES_DEV
,
5357 MODULE_ALIAS_FS("ext4");
5359 /* Shared across all ext4 file systems */
5360 wait_queue_head_t ext4__ioend_wq
[EXT4_WQ_HASH_SZ
];
5362 static int __init
ext4_init_fs(void)
5366 ratelimit_state_init(&ext4_mount_msg_ratelimit
, 30 * HZ
, 64);
5367 ext4_li_info
= NULL
;
5368 mutex_init(&ext4_li_mtx
);
5370 /* Build-time check for flags consistency */
5371 ext4_check_flag_values();
5373 for (i
= 0; i
< EXT4_WQ_HASH_SZ
; i
++)
5374 init_waitqueue_head(&ext4__ioend_wq
[i
]);
5376 err
= ext4_init_es();
5380 err
= ext4_init_pageio();
5384 err
= ext4_init_system_zone();
5388 err
= ext4_init_sysfs();
5392 err
= ext4_init_mballoc();
5395 err
= init_inodecache();
5400 err
= register_filesystem(&ext4_fs_type
);
5406 unregister_as_ext2();
5407 unregister_as_ext3();
5408 destroy_inodecache();
5410 ext4_exit_mballoc();
5414 ext4_exit_system_zone();
5423 static void __exit
ext4_exit_fs(void)
5426 ext4_destroy_lazyinit_thread();
5427 unregister_as_ext2();
5428 unregister_as_ext3();
5429 unregister_filesystem(&ext4_fs_type
);
5430 destroy_inodecache();
5431 ext4_exit_mballoc();
5433 ext4_exit_system_zone();
5438 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5439 MODULE_DESCRIPTION("Fourth Extended Filesystem");
5440 MODULE_LICENSE("GPL");
5441 module_init(ext4_init_fs
)
5442 module_exit(ext4_exit_fs
)