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/jbd2.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/blkdev.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/proc_fs.h>
38 #include <linux/ctype.h>
39 #include <linux/log2.h>
40 #include <linux/crc16.h>
41 #include <linux/cleancache.h>
42 #include <asm/uaccess.h>
44 #include <linux/kthread.h>
45 #include <linux/freezer.h>
48 #include "ext4_extents.h" /* Needed for trace points definition */
49 #include "ext4_jbd2.h"
54 #define CREATE_TRACE_POINTS
55 #include <trace/events/ext4.h>
57 static struct proc_dir_entry
*ext4_proc_root
;
58 static struct kset
*ext4_kset
;
59 static struct ext4_lazy_init
*ext4_li_info
;
60 static struct mutex ext4_li_mtx
;
61 static struct ext4_features
*ext4_feat
;
63 static int ext4_load_journal(struct super_block
*, struct ext4_super_block
*,
64 unsigned long journal_devnum
);
65 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
);
66 static int ext4_commit_super(struct super_block
*sb
, int sync
);
67 static void ext4_mark_recovery_complete(struct super_block
*sb
,
68 struct ext4_super_block
*es
);
69 static void ext4_clear_journal_err(struct super_block
*sb
,
70 struct ext4_super_block
*es
);
71 static int ext4_sync_fs(struct super_block
*sb
, int wait
);
72 static int ext4_sync_fs_nojournal(struct super_block
*sb
, int wait
);
73 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
);
74 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
);
75 static int ext4_unfreeze(struct super_block
*sb
);
76 static int ext4_freeze(struct super_block
*sb
);
77 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
78 const char *dev_name
, void *data
);
79 static inline int ext2_feature_set_ok(struct super_block
*sb
);
80 static inline int ext3_feature_set_ok(struct super_block
*sb
);
81 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
);
82 static void ext4_destroy_lazyinit_thread(void);
83 static void ext4_unregister_li_request(struct super_block
*sb
);
84 static void ext4_clear_request_list(void);
85 static int ext4_reserve_clusters(struct ext4_sb_info
*, ext4_fsblk_t
);
87 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
88 static struct file_system_type ext2_fs_type
= {
92 .kill_sb
= kill_block_super
,
93 .fs_flags
= FS_REQUIRES_DEV
,
95 MODULE_ALIAS_FS("ext2");
97 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
99 #define IS_EXT2_SB(sb) (0)
103 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
104 static struct file_system_type ext3_fs_type
= {
105 .owner
= THIS_MODULE
,
108 .kill_sb
= kill_block_super
,
109 .fs_flags
= FS_REQUIRES_DEV
,
111 MODULE_ALIAS_FS("ext3");
112 MODULE_ALIAS("ext3");
113 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
115 #define IS_EXT3_SB(sb) (0)
118 static int ext4_verify_csum_type(struct super_block
*sb
,
119 struct ext4_super_block
*es
)
121 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
,
122 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))
125 return es
->s_checksum_type
== EXT4_CRC32C_CHKSUM
;
128 static __le32
ext4_superblock_csum(struct super_block
*sb
,
129 struct ext4_super_block
*es
)
131 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
132 int offset
= offsetof(struct ext4_super_block
, s_checksum
);
135 csum
= ext4_chksum(sbi
, ~0, (char *)es
, offset
);
137 return cpu_to_le32(csum
);
140 int ext4_superblock_csum_verify(struct super_block
*sb
,
141 struct ext4_super_block
*es
)
143 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
,
144 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))
147 return es
->s_checksum
== ext4_superblock_csum(sb
, es
);
150 void ext4_superblock_csum_set(struct super_block
*sb
)
152 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
154 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
,
155 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))
158 es
->s_checksum
= ext4_superblock_csum(sb
, es
);
161 void *ext4_kvmalloc(size_t size
, gfp_t flags
)
165 ret
= kmalloc(size
, flags
| __GFP_NOWARN
);
167 ret
= __vmalloc(size
, flags
, PAGE_KERNEL
);
171 void *ext4_kvzalloc(size_t size
, gfp_t flags
)
175 ret
= kzalloc(size
, flags
| __GFP_NOWARN
);
177 ret
= __vmalloc(size
, flags
| __GFP_ZERO
, PAGE_KERNEL
);
181 void ext4_kvfree(void *ptr
)
183 if (is_vmalloc_addr(ptr
))
190 ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
191 struct ext4_group_desc
*bg
)
193 return le32_to_cpu(bg
->bg_block_bitmap_lo
) |
194 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
195 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
198 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
199 struct ext4_group_desc
*bg
)
201 return le32_to_cpu(bg
->bg_inode_bitmap_lo
) |
202 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
203 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
206 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
207 struct ext4_group_desc
*bg
)
209 return le32_to_cpu(bg
->bg_inode_table_lo
) |
210 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
211 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
214 __u32
ext4_free_group_clusters(struct super_block
*sb
,
215 struct ext4_group_desc
*bg
)
217 return le16_to_cpu(bg
->bg_free_blocks_count_lo
) |
218 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
219 (__u32
)le16_to_cpu(bg
->bg_free_blocks_count_hi
) << 16 : 0);
222 __u32
ext4_free_inodes_count(struct super_block
*sb
,
223 struct ext4_group_desc
*bg
)
225 return le16_to_cpu(bg
->bg_free_inodes_count_lo
) |
226 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
227 (__u32
)le16_to_cpu(bg
->bg_free_inodes_count_hi
) << 16 : 0);
230 __u32
ext4_used_dirs_count(struct super_block
*sb
,
231 struct ext4_group_desc
*bg
)
233 return le16_to_cpu(bg
->bg_used_dirs_count_lo
) |
234 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
235 (__u32
)le16_to_cpu(bg
->bg_used_dirs_count_hi
) << 16 : 0);
238 __u32
ext4_itable_unused_count(struct super_block
*sb
,
239 struct ext4_group_desc
*bg
)
241 return le16_to_cpu(bg
->bg_itable_unused_lo
) |
242 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
243 (__u32
)le16_to_cpu(bg
->bg_itable_unused_hi
) << 16 : 0);
246 void ext4_block_bitmap_set(struct super_block
*sb
,
247 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
249 bg
->bg_block_bitmap_lo
= cpu_to_le32((u32
)blk
);
250 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
251 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
254 void ext4_inode_bitmap_set(struct super_block
*sb
,
255 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
257 bg
->bg_inode_bitmap_lo
= cpu_to_le32((u32
)blk
);
258 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
259 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
262 void ext4_inode_table_set(struct super_block
*sb
,
263 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
265 bg
->bg_inode_table_lo
= cpu_to_le32((u32
)blk
);
266 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
267 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
270 void ext4_free_group_clusters_set(struct super_block
*sb
,
271 struct ext4_group_desc
*bg
, __u32 count
)
273 bg
->bg_free_blocks_count_lo
= cpu_to_le16((__u16
)count
);
274 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
275 bg
->bg_free_blocks_count_hi
= cpu_to_le16(count
>> 16);
278 void ext4_free_inodes_set(struct super_block
*sb
,
279 struct ext4_group_desc
*bg
, __u32 count
)
281 bg
->bg_free_inodes_count_lo
= cpu_to_le16((__u16
)count
);
282 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
283 bg
->bg_free_inodes_count_hi
= cpu_to_le16(count
>> 16);
286 void ext4_used_dirs_set(struct super_block
*sb
,
287 struct ext4_group_desc
*bg
, __u32 count
)
289 bg
->bg_used_dirs_count_lo
= cpu_to_le16((__u16
)count
);
290 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
291 bg
->bg_used_dirs_count_hi
= cpu_to_le16(count
>> 16);
294 void ext4_itable_unused_set(struct super_block
*sb
,
295 struct ext4_group_desc
*bg
, __u32 count
)
297 bg
->bg_itable_unused_lo
= cpu_to_le16((__u16
)count
);
298 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
299 bg
->bg_itable_unused_hi
= cpu_to_le16(count
>> 16);
303 static void __save_error_info(struct super_block
*sb
, const char *func
,
306 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
308 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
309 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
310 es
->s_last_error_time
= cpu_to_le32(get_seconds());
311 strncpy(es
->s_last_error_func
, func
, sizeof(es
->s_last_error_func
));
312 es
->s_last_error_line
= cpu_to_le32(line
);
313 if (!es
->s_first_error_time
) {
314 es
->s_first_error_time
= es
->s_last_error_time
;
315 strncpy(es
->s_first_error_func
, func
,
316 sizeof(es
->s_first_error_func
));
317 es
->s_first_error_line
= cpu_to_le32(line
);
318 es
->s_first_error_ino
= es
->s_last_error_ino
;
319 es
->s_first_error_block
= es
->s_last_error_block
;
322 * Start the daily error reporting function if it hasn't been
325 if (!es
->s_error_count
)
326 mod_timer(&EXT4_SB(sb
)->s_err_report
, jiffies
+ 24*60*60*HZ
);
327 le32_add_cpu(&es
->s_error_count
, 1);
330 static void save_error_info(struct super_block
*sb
, const char *func
,
333 __save_error_info(sb
, func
, line
);
334 ext4_commit_super(sb
, 1);
338 * The del_gendisk() function uninitializes the disk-specific data
339 * structures, including the bdi structure, without telling anyone
340 * else. Once this happens, any attempt to call mark_buffer_dirty()
341 * (for example, by ext4_commit_super), will cause a kernel OOPS.
342 * This is a kludge to prevent these oops until we can put in a proper
343 * hook in del_gendisk() to inform the VFS and file system layers.
345 static int block_device_ejected(struct super_block
*sb
)
347 struct inode
*bd_inode
= sb
->s_bdev
->bd_inode
;
348 struct backing_dev_info
*bdi
= bd_inode
->i_mapping
->backing_dev_info
;
350 return bdi
->dev
== NULL
;
353 static void ext4_journal_commit_callback(journal_t
*journal
, transaction_t
*txn
)
355 struct super_block
*sb
= journal
->j_private
;
356 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
357 int error
= is_journal_aborted(journal
);
358 struct ext4_journal_cb_entry
*jce
;
360 BUG_ON(txn
->t_state
== T_FINISHED
);
361 spin_lock(&sbi
->s_md_lock
);
362 while (!list_empty(&txn
->t_private_list
)) {
363 jce
= list_entry(txn
->t_private_list
.next
,
364 struct ext4_journal_cb_entry
, jce_list
);
365 list_del_init(&jce
->jce_list
);
366 spin_unlock(&sbi
->s_md_lock
);
367 jce
->jce_func(sb
, jce
, error
);
368 spin_lock(&sbi
->s_md_lock
);
370 spin_unlock(&sbi
->s_md_lock
);
373 /* Deal with the reporting of failure conditions on a filesystem such as
374 * inconsistencies detected or read IO failures.
376 * On ext2, we can store the error state of the filesystem in the
377 * superblock. That is not possible on ext4, because we may have other
378 * write ordering constraints on the superblock which prevent us from
379 * writing it out straight away; and given that the journal is about to
380 * be aborted, we can't rely on the current, or future, transactions to
381 * write out the superblock safely.
383 * We'll just use the jbd2_journal_abort() error code to record an error in
384 * the journal instead. On recovery, the journal will complain about
385 * that error until we've noted it down and cleared it.
388 static void ext4_handle_error(struct super_block
*sb
)
390 if (sb
->s_flags
& MS_RDONLY
)
393 if (!test_opt(sb
, ERRORS_CONT
)) {
394 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
396 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
398 jbd2_journal_abort(journal
, -EIO
);
400 if (test_opt(sb
, ERRORS_RO
)) {
401 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
403 * Make sure updated value of ->s_mount_flags will be visible
404 * before ->s_flags update
407 sb
->s_flags
|= MS_RDONLY
;
409 if (test_opt(sb
, ERRORS_PANIC
))
410 panic("EXT4-fs (device %s): panic forced after error\n",
414 #define ext4_error_ratelimit(sb) \
415 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
418 void __ext4_error(struct super_block
*sb
, const char *function
,
419 unsigned int line
, const char *fmt
, ...)
421 struct va_format vaf
;
424 if (ext4_error_ratelimit(sb
)) {
429 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
430 sb
->s_id
, function
, line
, current
->comm
, &vaf
);
433 save_error_info(sb
, function
, line
);
434 ext4_handle_error(sb
);
437 void __ext4_error_inode(struct inode
*inode
, const char *function
,
438 unsigned int line
, ext4_fsblk_t block
,
439 const char *fmt
, ...)
442 struct va_format vaf
;
443 struct ext4_super_block
*es
= EXT4_SB(inode
->i_sb
)->s_es
;
445 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
446 es
->s_last_error_block
= cpu_to_le64(block
);
447 if (ext4_error_ratelimit(inode
->i_sb
)) {
452 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
453 "inode #%lu: block %llu: comm %s: %pV\n",
454 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
455 block
, current
->comm
, &vaf
);
457 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
458 "inode #%lu: comm %s: %pV\n",
459 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
460 current
->comm
, &vaf
);
463 save_error_info(inode
->i_sb
, function
, line
);
464 ext4_handle_error(inode
->i_sb
);
467 void __ext4_error_file(struct file
*file
, const char *function
,
468 unsigned int line
, ext4_fsblk_t block
,
469 const char *fmt
, ...)
472 struct va_format vaf
;
473 struct ext4_super_block
*es
;
474 struct inode
*inode
= file_inode(file
);
475 char pathname
[80], *path
;
477 es
= EXT4_SB(inode
->i_sb
)->s_es
;
478 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
479 if (ext4_error_ratelimit(inode
->i_sb
)) {
480 path
= d_path(&(file
->f_path
), pathname
, sizeof(pathname
));
488 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
489 "block %llu: comm %s: path %s: %pV\n",
490 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
491 block
, current
->comm
, path
, &vaf
);
494 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
495 "comm %s: path %s: %pV\n",
496 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
497 current
->comm
, path
, &vaf
);
500 save_error_info(inode
->i_sb
, function
, line
);
501 ext4_handle_error(inode
->i_sb
);
504 const char *ext4_decode_error(struct super_block
*sb
, int errno
,
511 errstr
= "IO failure";
514 errstr
= "Out of memory";
517 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
518 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
519 errstr
= "Journal has aborted";
521 errstr
= "Readonly filesystem";
524 /* If the caller passed in an extra buffer for unknown
525 * errors, textualise them now. Else we just return
528 /* Check for truncated error codes... */
529 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
538 /* __ext4_std_error decodes expected errors from journaling functions
539 * automatically and invokes the appropriate error response. */
541 void __ext4_std_error(struct super_block
*sb
, const char *function
,
542 unsigned int line
, int errno
)
547 /* Special case: if the error is EROFS, and we're not already
548 * inside a transaction, then there's really no point in logging
550 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
551 (sb
->s_flags
& MS_RDONLY
))
554 if (ext4_error_ratelimit(sb
)) {
555 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
556 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s:%d: %s\n",
557 sb
->s_id
, function
, line
, errstr
);
560 save_error_info(sb
, function
, line
);
561 ext4_handle_error(sb
);
565 * ext4_abort is a much stronger failure handler than ext4_error. The
566 * abort function may be used to deal with unrecoverable failures such
567 * as journal IO errors or ENOMEM at a critical moment in log management.
569 * We unconditionally force the filesystem into an ABORT|READONLY state,
570 * unless the error response on the fs has been set to panic in which
571 * case we take the easy way out and panic immediately.
574 void __ext4_abort(struct super_block
*sb
, const char *function
,
575 unsigned int line
, const char *fmt
, ...)
579 save_error_info(sb
, function
, line
);
581 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: ", sb
->s_id
,
587 if ((sb
->s_flags
& MS_RDONLY
) == 0) {
588 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
589 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
591 * Make sure updated value of ->s_mount_flags will be visible
592 * before ->s_flags update
595 sb
->s_flags
|= MS_RDONLY
;
596 if (EXT4_SB(sb
)->s_journal
)
597 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
598 save_error_info(sb
, function
, line
);
600 if (test_opt(sb
, ERRORS_PANIC
))
601 panic("EXT4-fs panic from previous error\n");
604 void __ext4_msg(struct super_block
*sb
,
605 const char *prefix
, const char *fmt
, ...)
607 struct va_format vaf
;
610 if (!___ratelimit(&(EXT4_SB(sb
)->s_msg_ratelimit_state
), "EXT4-fs"))
616 printk("%sEXT4-fs (%s): %pV\n", prefix
, sb
->s_id
, &vaf
);
620 void __ext4_warning(struct super_block
*sb
, const char *function
,
621 unsigned int line
, const char *fmt
, ...)
623 struct va_format vaf
;
626 if (!___ratelimit(&(EXT4_SB(sb
)->s_warning_ratelimit_state
),
633 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: %pV\n",
634 sb
->s_id
, function
, line
, &vaf
);
638 void __ext4_grp_locked_error(const char *function
, unsigned int line
,
639 struct super_block
*sb
, ext4_group_t grp
,
640 unsigned long ino
, ext4_fsblk_t block
,
641 const char *fmt
, ...)
645 struct va_format vaf
;
647 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
649 es
->s_last_error_ino
= cpu_to_le32(ino
);
650 es
->s_last_error_block
= cpu_to_le64(block
);
651 __save_error_info(sb
, function
, line
);
653 if (ext4_error_ratelimit(sb
)) {
657 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: group %u, ",
658 sb
->s_id
, function
, line
, grp
);
660 printk(KERN_CONT
"inode %lu: ", ino
);
662 printk(KERN_CONT
"block %llu:",
663 (unsigned long long) block
);
664 printk(KERN_CONT
"%pV\n", &vaf
);
668 if (test_opt(sb
, ERRORS_CONT
)) {
669 ext4_commit_super(sb
, 0);
673 ext4_unlock_group(sb
, grp
);
674 ext4_handle_error(sb
);
676 * We only get here in the ERRORS_RO case; relocking the group
677 * may be dangerous, but nothing bad will happen since the
678 * filesystem will have already been marked read/only and the
679 * journal has been aborted. We return 1 as a hint to callers
680 * who might what to use the return value from
681 * ext4_grp_locked_error() to distinguish between the
682 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
683 * aggressively from the ext4 function in question, with a
684 * more appropriate error code.
686 ext4_lock_group(sb
, grp
);
690 void ext4_update_dynamic_rev(struct super_block
*sb
)
692 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
694 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
698 "updating to rev %d because of new feature flag, "
699 "running e2fsck is recommended",
702 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
703 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
704 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
705 /* leave es->s_feature_*compat flags alone */
706 /* es->s_uuid will be set by e2fsck if empty */
709 * The rest of the superblock fields should be zero, and if not it
710 * means they are likely already in use, so leave them alone. We
711 * can leave it up to e2fsck to clean up any inconsistencies there.
716 * Open the external journal device
718 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
720 struct block_device
*bdev
;
721 char b
[BDEVNAME_SIZE
];
723 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
, sb
);
729 ext4_msg(sb
, KERN_ERR
, "failed to open journal device %s: %ld",
730 __bdevname(dev
, b
), PTR_ERR(bdev
));
735 * Release the journal device
737 static void ext4_blkdev_put(struct block_device
*bdev
)
739 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
742 static void ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
744 struct block_device
*bdev
;
745 bdev
= sbi
->journal_bdev
;
747 ext4_blkdev_put(bdev
);
748 sbi
->journal_bdev
= NULL
;
752 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
754 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
757 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
761 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
762 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
764 printk(KERN_ERR
"sb_info orphan list:\n");
765 list_for_each(l
, &sbi
->s_orphan
) {
766 struct inode
*inode
= orphan_list_entry(l
);
768 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
769 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
770 inode
->i_mode
, inode
->i_nlink
,
775 static void ext4_put_super(struct super_block
*sb
)
777 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
778 struct ext4_super_block
*es
= sbi
->s_es
;
781 ext4_unregister_li_request(sb
);
782 dquot_disable(sb
, -1, DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
784 flush_workqueue(sbi
->rsv_conversion_wq
);
785 destroy_workqueue(sbi
->rsv_conversion_wq
);
787 if (sbi
->s_journal
) {
788 err
= jbd2_journal_destroy(sbi
->s_journal
);
789 sbi
->s_journal
= NULL
;
791 ext4_abort(sb
, "Couldn't clean up the journal");
794 ext4_es_unregister_shrinker(sbi
);
795 del_timer_sync(&sbi
->s_err_report
);
796 ext4_release_system_zone(sb
);
798 ext4_ext_release(sb
);
799 ext4_xattr_put_super(sb
);
801 if (!(sb
->s_flags
& MS_RDONLY
)) {
802 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
803 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
805 if (!(sb
->s_flags
& MS_RDONLY
))
806 ext4_commit_super(sb
, 1);
809 remove_proc_entry("options", sbi
->s_proc
);
810 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
812 kobject_del(&sbi
->s_kobj
);
814 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
815 brelse(sbi
->s_group_desc
[i
]);
816 ext4_kvfree(sbi
->s_group_desc
);
817 ext4_kvfree(sbi
->s_flex_groups
);
818 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
819 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
820 percpu_counter_destroy(&sbi
->s_dirs_counter
);
821 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
822 percpu_counter_destroy(&sbi
->s_extent_cache_cnt
);
825 for (i
= 0; i
< MAXQUOTAS
; i
++)
826 kfree(sbi
->s_qf_names
[i
]);
829 /* Debugging code just in case the in-memory inode orphan list
830 * isn't empty. The on-disk one can be non-empty if we've
831 * detected an error and taken the fs readonly, but the
832 * in-memory list had better be clean by this point. */
833 if (!list_empty(&sbi
->s_orphan
))
834 dump_orphan_list(sb
, sbi
);
835 J_ASSERT(list_empty(&sbi
->s_orphan
));
837 invalidate_bdev(sb
->s_bdev
);
838 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
840 * Invalidate the journal device's buffers. We don't want them
841 * floating about in memory - the physical journal device may
842 * hotswapped, and it breaks the `ro-after' testing code.
844 sync_blockdev(sbi
->journal_bdev
);
845 invalidate_bdev(sbi
->journal_bdev
);
846 ext4_blkdev_remove(sbi
);
849 kthread_stop(sbi
->s_mmp_tsk
);
850 sb
->s_fs_info
= NULL
;
852 * Now that we are completely done shutting down the
853 * superblock, we need to actually destroy the kobject.
855 kobject_put(&sbi
->s_kobj
);
856 wait_for_completion(&sbi
->s_kobj_unregister
);
857 if (sbi
->s_chksum_driver
)
858 crypto_free_shash(sbi
->s_chksum_driver
);
859 kfree(sbi
->s_blockgroup_lock
);
863 static struct kmem_cache
*ext4_inode_cachep
;
866 * Called inside transaction, so use GFP_NOFS
868 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
870 struct ext4_inode_info
*ei
;
872 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
876 ei
->vfs_inode
.i_version
= 1;
877 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
878 spin_lock_init(&ei
->i_prealloc_lock
);
879 ext4_es_init_tree(&ei
->i_es_tree
);
880 rwlock_init(&ei
->i_es_lock
);
881 INIT_LIST_HEAD(&ei
->i_es_lru
);
883 ei
->i_touch_when
= 0;
884 ei
->i_reserved_data_blocks
= 0;
885 ei
->i_reserved_meta_blocks
= 0;
886 ei
->i_allocated_meta_blocks
= 0;
887 ei
->i_da_metadata_calc_len
= 0;
888 ei
->i_da_metadata_calc_last_lblock
= 0;
889 spin_lock_init(&(ei
->i_block_reservation_lock
));
891 ei
->i_reserved_quota
= 0;
894 INIT_LIST_HEAD(&ei
->i_rsv_conversion_list
);
895 spin_lock_init(&ei
->i_completed_io_lock
);
897 ei
->i_datasync_tid
= 0;
898 atomic_set(&ei
->i_ioend_count
, 0);
899 atomic_set(&ei
->i_unwritten
, 0);
900 INIT_WORK(&ei
->i_rsv_conversion_work
, ext4_end_io_rsv_work
);
902 return &ei
->vfs_inode
;
905 static int ext4_drop_inode(struct inode
*inode
)
907 int drop
= generic_drop_inode(inode
);
909 trace_ext4_drop_inode(inode
, drop
);
913 static void ext4_i_callback(struct rcu_head
*head
)
915 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
916 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
919 static void ext4_destroy_inode(struct inode
*inode
)
921 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
922 ext4_msg(inode
->i_sb
, KERN_ERR
,
923 "Inode %lu (%p): orphan list check failed!",
924 inode
->i_ino
, EXT4_I(inode
));
925 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
926 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
930 call_rcu(&inode
->i_rcu
, ext4_i_callback
);
933 static void init_once(void *foo
)
935 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
937 INIT_LIST_HEAD(&ei
->i_orphan
);
938 init_rwsem(&ei
->xattr_sem
);
939 init_rwsem(&ei
->i_data_sem
);
940 inode_init_once(&ei
->vfs_inode
);
943 static int init_inodecache(void)
945 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
946 sizeof(struct ext4_inode_info
),
947 0, (SLAB_RECLAIM_ACCOUNT
|
950 if (ext4_inode_cachep
== NULL
)
955 static void destroy_inodecache(void)
958 * Make sure all delayed rcu free inodes are flushed before we
962 kmem_cache_destroy(ext4_inode_cachep
);
965 void ext4_clear_inode(struct inode
*inode
)
967 invalidate_inode_buffers(inode
);
970 ext4_discard_preallocations(inode
);
971 ext4_es_remove_extent(inode
, 0, EXT_MAX_BLOCKS
);
972 ext4_es_lru_del(inode
);
973 if (EXT4_I(inode
)->jinode
) {
974 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode
),
975 EXT4_I(inode
)->jinode
);
976 jbd2_free_inode(EXT4_I(inode
)->jinode
);
977 EXT4_I(inode
)->jinode
= NULL
;
981 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
982 u64 ino
, u32 generation
)
986 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
987 return ERR_PTR(-ESTALE
);
988 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
989 return ERR_PTR(-ESTALE
);
991 /* iget isn't really right if the inode is currently unallocated!!
993 * ext4_read_inode will return a bad_inode if the inode had been
994 * deleted, so we should be safe.
996 * Currently we don't know the generation for parent directory, so
997 * a generation of 0 means "accept any"
999 inode
= ext4_iget(sb
, ino
);
1001 return ERR_CAST(inode
);
1002 if (generation
&& inode
->i_generation
!= generation
) {
1004 return ERR_PTR(-ESTALE
);
1010 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
1011 int fh_len
, int fh_type
)
1013 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
1014 ext4_nfs_get_inode
);
1017 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
1018 int fh_len
, int fh_type
)
1020 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
1021 ext4_nfs_get_inode
);
1025 * Try to release metadata pages (indirect blocks, directories) which are
1026 * mapped via the block device. Since these pages could have journal heads
1027 * which would prevent try_to_free_buffers() from freeing them, we must use
1028 * jbd2 layer's try_to_free_buffers() function to release them.
1030 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
1033 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
1035 WARN_ON(PageChecked(page
));
1036 if (!page_has_buffers(page
))
1039 return jbd2_journal_try_to_free_buffers(journal
, page
,
1040 wait
& ~__GFP_WAIT
);
1041 return try_to_free_buffers(page
);
1045 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1046 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1048 static int ext4_write_dquot(struct dquot
*dquot
);
1049 static int ext4_acquire_dquot(struct dquot
*dquot
);
1050 static int ext4_release_dquot(struct dquot
*dquot
);
1051 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1052 static int ext4_write_info(struct super_block
*sb
, int type
);
1053 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1055 static int ext4_quota_on_sysfile(struct super_block
*sb
, int type
,
1057 static int ext4_quota_off(struct super_block
*sb
, int type
);
1058 static int ext4_quota_off_sysfile(struct super_block
*sb
, int type
);
1059 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1060 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1061 size_t len
, loff_t off
);
1062 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1063 const char *data
, size_t len
, loff_t off
);
1064 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
1065 unsigned int flags
);
1066 static int ext4_enable_quotas(struct super_block
*sb
);
1068 static const struct dquot_operations ext4_quota_operations
= {
1069 .get_reserved_space
= ext4_get_reserved_space
,
1070 .write_dquot
= ext4_write_dquot
,
1071 .acquire_dquot
= ext4_acquire_dquot
,
1072 .release_dquot
= ext4_release_dquot
,
1073 .mark_dirty
= ext4_mark_dquot_dirty
,
1074 .write_info
= ext4_write_info
,
1075 .alloc_dquot
= dquot_alloc
,
1076 .destroy_dquot
= dquot_destroy
,
1079 static const struct quotactl_ops ext4_qctl_operations
= {
1080 .quota_on
= ext4_quota_on
,
1081 .quota_off
= ext4_quota_off
,
1082 .quota_sync
= dquot_quota_sync
,
1083 .get_info
= dquot_get_dqinfo
,
1084 .set_info
= dquot_set_dqinfo
,
1085 .get_dqblk
= dquot_get_dqblk
,
1086 .set_dqblk
= dquot_set_dqblk
1089 static const struct quotactl_ops ext4_qctl_sysfile_operations
= {
1090 .quota_on_meta
= ext4_quota_on_sysfile
,
1091 .quota_off
= ext4_quota_off_sysfile
,
1092 .quota_sync
= dquot_quota_sync
,
1093 .get_info
= dquot_get_dqinfo
,
1094 .set_info
= dquot_set_dqinfo
,
1095 .get_dqblk
= dquot_get_dqblk
,
1096 .set_dqblk
= dquot_set_dqblk
1100 static const struct super_operations ext4_sops
= {
1101 .alloc_inode
= ext4_alloc_inode
,
1102 .destroy_inode
= ext4_destroy_inode
,
1103 .write_inode
= ext4_write_inode
,
1104 .dirty_inode
= ext4_dirty_inode
,
1105 .drop_inode
= ext4_drop_inode
,
1106 .evict_inode
= ext4_evict_inode
,
1107 .put_super
= ext4_put_super
,
1108 .sync_fs
= ext4_sync_fs
,
1109 .freeze_fs
= ext4_freeze
,
1110 .unfreeze_fs
= ext4_unfreeze
,
1111 .statfs
= ext4_statfs
,
1112 .remount_fs
= ext4_remount
,
1113 .show_options
= ext4_show_options
,
1115 .quota_read
= ext4_quota_read
,
1116 .quota_write
= ext4_quota_write
,
1118 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1121 static const struct super_operations ext4_nojournal_sops
= {
1122 .alloc_inode
= ext4_alloc_inode
,
1123 .destroy_inode
= ext4_destroy_inode
,
1124 .write_inode
= ext4_write_inode
,
1125 .dirty_inode
= ext4_dirty_inode
,
1126 .drop_inode
= ext4_drop_inode
,
1127 .evict_inode
= ext4_evict_inode
,
1128 .sync_fs
= ext4_sync_fs_nojournal
,
1129 .put_super
= ext4_put_super
,
1130 .statfs
= ext4_statfs
,
1131 .remount_fs
= ext4_remount
,
1132 .show_options
= ext4_show_options
,
1134 .quota_read
= ext4_quota_read
,
1135 .quota_write
= ext4_quota_write
,
1137 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1140 static const struct export_operations ext4_export_ops
= {
1141 .fh_to_dentry
= ext4_fh_to_dentry
,
1142 .fh_to_parent
= ext4_fh_to_parent
,
1143 .get_parent
= ext4_get_parent
,
1147 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1148 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1149 Opt_nouid32
, Opt_debug
, Opt_removed
,
1150 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1151 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
,
1152 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
, Opt_journal_dev
,
1153 Opt_journal_path
, Opt_journal_checksum
, Opt_journal_async_commit
,
1154 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1155 Opt_data_err_abort
, Opt_data_err_ignore
,
1156 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1157 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1158 Opt_noquota
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1159 Opt_usrquota
, Opt_grpquota
, Opt_i_version
,
1160 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
, Opt_mblk_io_submit
,
1161 Opt_nomblk_io_submit
, Opt_block_validity
, Opt_noblock_validity
,
1162 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1163 Opt_dioread_nolock
, Opt_dioread_lock
,
1164 Opt_discard
, Opt_nodiscard
, Opt_init_itable
, Opt_noinit_itable
,
1165 Opt_max_dir_size_kb
,
1168 static const match_table_t tokens
= {
1169 {Opt_bsd_df
, "bsddf"},
1170 {Opt_minix_df
, "minixdf"},
1171 {Opt_grpid
, "grpid"},
1172 {Opt_grpid
, "bsdgroups"},
1173 {Opt_nogrpid
, "nogrpid"},
1174 {Opt_nogrpid
, "sysvgroups"},
1175 {Opt_resgid
, "resgid=%u"},
1176 {Opt_resuid
, "resuid=%u"},
1178 {Opt_err_cont
, "errors=continue"},
1179 {Opt_err_panic
, "errors=panic"},
1180 {Opt_err_ro
, "errors=remount-ro"},
1181 {Opt_nouid32
, "nouid32"},
1182 {Opt_debug
, "debug"},
1183 {Opt_removed
, "oldalloc"},
1184 {Opt_removed
, "orlov"},
1185 {Opt_user_xattr
, "user_xattr"},
1186 {Opt_nouser_xattr
, "nouser_xattr"},
1188 {Opt_noacl
, "noacl"},
1189 {Opt_noload
, "norecovery"},
1190 {Opt_noload
, "noload"},
1191 {Opt_removed
, "nobh"},
1192 {Opt_removed
, "bh"},
1193 {Opt_commit
, "commit=%u"},
1194 {Opt_min_batch_time
, "min_batch_time=%u"},
1195 {Opt_max_batch_time
, "max_batch_time=%u"},
1196 {Opt_journal_dev
, "journal_dev=%u"},
1197 {Opt_journal_path
, "journal_path=%s"},
1198 {Opt_journal_checksum
, "journal_checksum"},
1199 {Opt_journal_async_commit
, "journal_async_commit"},
1200 {Opt_abort
, "abort"},
1201 {Opt_data_journal
, "data=journal"},
1202 {Opt_data_ordered
, "data=ordered"},
1203 {Opt_data_writeback
, "data=writeback"},
1204 {Opt_data_err_abort
, "data_err=abort"},
1205 {Opt_data_err_ignore
, "data_err=ignore"},
1206 {Opt_offusrjquota
, "usrjquota="},
1207 {Opt_usrjquota
, "usrjquota=%s"},
1208 {Opt_offgrpjquota
, "grpjquota="},
1209 {Opt_grpjquota
, "grpjquota=%s"},
1210 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1211 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1212 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1213 {Opt_grpquota
, "grpquota"},
1214 {Opt_noquota
, "noquota"},
1215 {Opt_quota
, "quota"},
1216 {Opt_usrquota
, "usrquota"},
1217 {Opt_barrier
, "barrier=%u"},
1218 {Opt_barrier
, "barrier"},
1219 {Opt_nobarrier
, "nobarrier"},
1220 {Opt_i_version
, "i_version"},
1221 {Opt_stripe
, "stripe=%u"},
1222 {Opt_delalloc
, "delalloc"},
1223 {Opt_nodelalloc
, "nodelalloc"},
1224 {Opt_removed
, "mblk_io_submit"},
1225 {Opt_removed
, "nomblk_io_submit"},
1226 {Opt_block_validity
, "block_validity"},
1227 {Opt_noblock_validity
, "noblock_validity"},
1228 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1229 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1230 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1231 {Opt_auto_da_alloc
, "auto_da_alloc"},
1232 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1233 {Opt_dioread_nolock
, "dioread_nolock"},
1234 {Opt_dioread_lock
, "dioread_lock"},
1235 {Opt_discard
, "discard"},
1236 {Opt_nodiscard
, "nodiscard"},
1237 {Opt_init_itable
, "init_itable=%u"},
1238 {Opt_init_itable
, "init_itable"},
1239 {Opt_noinit_itable
, "noinit_itable"},
1240 {Opt_max_dir_size_kb
, "max_dir_size_kb=%u"},
1241 {Opt_removed
, "check=none"}, /* mount option from ext2/3 */
1242 {Opt_removed
, "nocheck"}, /* mount option from ext2/3 */
1243 {Opt_removed
, "reservation"}, /* mount option from ext2/3 */
1244 {Opt_removed
, "noreservation"}, /* mount option from ext2/3 */
1245 {Opt_removed
, "journal=%u"}, /* mount option from ext2/3 */
1249 static ext4_fsblk_t
get_sb_block(void **data
)
1251 ext4_fsblk_t sb_block
;
1252 char *options
= (char *) *data
;
1254 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1255 return 1; /* Default location */
1258 /* TODO: use simple_strtoll with >32bit ext4 */
1259 sb_block
= simple_strtoul(options
, &options
, 0);
1260 if (*options
&& *options
!= ',') {
1261 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1265 if (*options
== ',')
1267 *data
= (void *) options
;
1272 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1273 static char deprecated_msg
[] = "Mount option \"%s\" will be removed by %s\n"
1274 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1277 static int set_qf_name(struct super_block
*sb
, int qtype
, substring_t
*args
)
1279 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1283 if (sb_any_quota_loaded(sb
) &&
1284 !sbi
->s_qf_names
[qtype
]) {
1285 ext4_msg(sb
, KERN_ERR
,
1286 "Cannot change journaled "
1287 "quota options when quota turned on");
1290 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
)) {
1291 ext4_msg(sb
, KERN_ERR
, "Cannot set journaled quota options "
1292 "when QUOTA feature is enabled");
1295 qname
= match_strdup(args
);
1297 ext4_msg(sb
, KERN_ERR
,
1298 "Not enough memory for storing quotafile name");
1301 if (sbi
->s_qf_names
[qtype
]) {
1302 if (strcmp(sbi
->s_qf_names
[qtype
], qname
) == 0)
1305 ext4_msg(sb
, KERN_ERR
,
1306 "%s quota file already specified",
1310 if (strchr(qname
, '/')) {
1311 ext4_msg(sb
, KERN_ERR
,
1312 "quotafile must be on filesystem root");
1315 sbi
->s_qf_names
[qtype
] = qname
;
1323 static int clear_qf_name(struct super_block
*sb
, int qtype
)
1326 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1328 if (sb_any_quota_loaded(sb
) &&
1329 sbi
->s_qf_names
[qtype
]) {
1330 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled quota options"
1331 " when quota turned on");
1334 kfree(sbi
->s_qf_names
[qtype
]);
1335 sbi
->s_qf_names
[qtype
] = NULL
;
1340 #define MOPT_SET 0x0001
1341 #define MOPT_CLEAR 0x0002
1342 #define MOPT_NOSUPPORT 0x0004
1343 #define MOPT_EXPLICIT 0x0008
1344 #define MOPT_CLEAR_ERR 0x0010
1345 #define MOPT_GTE0 0x0020
1348 #define MOPT_QFMT 0x0040
1350 #define MOPT_Q MOPT_NOSUPPORT
1351 #define MOPT_QFMT MOPT_NOSUPPORT
1353 #define MOPT_DATAJ 0x0080
1354 #define MOPT_NO_EXT2 0x0100
1355 #define MOPT_NO_EXT3 0x0200
1356 #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1357 #define MOPT_STRING 0x0400
1359 static const struct mount_opts
{
1363 } ext4_mount_opts
[] = {
1364 {Opt_minix_df
, EXT4_MOUNT_MINIX_DF
, MOPT_SET
},
1365 {Opt_bsd_df
, EXT4_MOUNT_MINIX_DF
, MOPT_CLEAR
},
1366 {Opt_grpid
, EXT4_MOUNT_GRPID
, MOPT_SET
},
1367 {Opt_nogrpid
, EXT4_MOUNT_GRPID
, MOPT_CLEAR
},
1368 {Opt_block_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_SET
},
1369 {Opt_noblock_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_CLEAR
},
1370 {Opt_dioread_nolock
, EXT4_MOUNT_DIOREAD_NOLOCK
,
1371 MOPT_EXT4_ONLY
| MOPT_SET
},
1372 {Opt_dioread_lock
, EXT4_MOUNT_DIOREAD_NOLOCK
,
1373 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1374 {Opt_discard
, EXT4_MOUNT_DISCARD
, MOPT_SET
},
1375 {Opt_nodiscard
, EXT4_MOUNT_DISCARD
, MOPT_CLEAR
},
1376 {Opt_delalloc
, EXT4_MOUNT_DELALLOC
,
1377 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1378 {Opt_nodelalloc
, EXT4_MOUNT_DELALLOC
,
1379 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1380 {Opt_journal_checksum
, EXT4_MOUNT_JOURNAL_CHECKSUM
,
1381 MOPT_EXT4_ONLY
| MOPT_SET
},
1382 {Opt_journal_async_commit
, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT
|
1383 EXT4_MOUNT_JOURNAL_CHECKSUM
),
1384 MOPT_EXT4_ONLY
| MOPT_SET
},
1385 {Opt_noload
, EXT4_MOUNT_NOLOAD
, MOPT_NO_EXT2
| MOPT_SET
},
1386 {Opt_err_panic
, EXT4_MOUNT_ERRORS_PANIC
, MOPT_SET
| MOPT_CLEAR_ERR
},
1387 {Opt_err_ro
, EXT4_MOUNT_ERRORS_RO
, MOPT_SET
| MOPT_CLEAR_ERR
},
1388 {Opt_err_cont
, EXT4_MOUNT_ERRORS_CONT
, MOPT_SET
| MOPT_CLEAR_ERR
},
1389 {Opt_data_err_abort
, EXT4_MOUNT_DATA_ERR_ABORT
,
1390 MOPT_NO_EXT2
| MOPT_SET
},
1391 {Opt_data_err_ignore
, EXT4_MOUNT_DATA_ERR_ABORT
,
1392 MOPT_NO_EXT2
| MOPT_CLEAR
},
1393 {Opt_barrier
, EXT4_MOUNT_BARRIER
, MOPT_SET
},
1394 {Opt_nobarrier
, EXT4_MOUNT_BARRIER
, MOPT_CLEAR
},
1395 {Opt_noauto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_SET
},
1396 {Opt_auto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_CLEAR
},
1397 {Opt_noinit_itable
, EXT4_MOUNT_INIT_INODE_TABLE
, MOPT_CLEAR
},
1398 {Opt_commit
, 0, MOPT_GTE0
},
1399 {Opt_max_batch_time
, 0, MOPT_GTE0
},
1400 {Opt_min_batch_time
, 0, MOPT_GTE0
},
1401 {Opt_inode_readahead_blks
, 0, MOPT_GTE0
},
1402 {Opt_init_itable
, 0, MOPT_GTE0
},
1403 {Opt_stripe
, 0, MOPT_GTE0
},
1404 {Opt_resuid
, 0, MOPT_GTE0
},
1405 {Opt_resgid
, 0, MOPT_GTE0
},
1406 {Opt_journal_dev
, 0, MOPT_GTE0
},
1407 {Opt_journal_path
, 0, MOPT_STRING
},
1408 {Opt_journal_ioprio
, 0, MOPT_GTE0
},
1409 {Opt_data_journal
, EXT4_MOUNT_JOURNAL_DATA
, MOPT_NO_EXT2
| MOPT_DATAJ
},
1410 {Opt_data_ordered
, EXT4_MOUNT_ORDERED_DATA
, MOPT_NO_EXT2
| MOPT_DATAJ
},
1411 {Opt_data_writeback
, EXT4_MOUNT_WRITEBACK_DATA
,
1412 MOPT_NO_EXT2
| MOPT_DATAJ
},
1413 {Opt_user_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_SET
},
1414 {Opt_nouser_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_CLEAR
},
1415 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1416 {Opt_acl
, EXT4_MOUNT_POSIX_ACL
, MOPT_SET
},
1417 {Opt_noacl
, EXT4_MOUNT_POSIX_ACL
, MOPT_CLEAR
},
1419 {Opt_acl
, 0, MOPT_NOSUPPORT
},
1420 {Opt_noacl
, 0, MOPT_NOSUPPORT
},
1422 {Opt_nouid32
, EXT4_MOUNT_NO_UID32
, MOPT_SET
},
1423 {Opt_debug
, EXT4_MOUNT_DEBUG
, MOPT_SET
},
1424 {Opt_quota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
, MOPT_SET
| MOPT_Q
},
1425 {Opt_usrquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
,
1427 {Opt_grpquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_GRPQUOTA
,
1429 {Opt_noquota
, (EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
|
1430 EXT4_MOUNT_GRPQUOTA
), MOPT_CLEAR
| MOPT_Q
},
1431 {Opt_usrjquota
, 0, MOPT_Q
},
1432 {Opt_grpjquota
, 0, MOPT_Q
},
1433 {Opt_offusrjquota
, 0, MOPT_Q
},
1434 {Opt_offgrpjquota
, 0, MOPT_Q
},
1435 {Opt_jqfmt_vfsold
, QFMT_VFS_OLD
, MOPT_QFMT
},
1436 {Opt_jqfmt_vfsv0
, QFMT_VFS_V0
, MOPT_QFMT
},
1437 {Opt_jqfmt_vfsv1
, QFMT_VFS_V1
, MOPT_QFMT
},
1438 {Opt_max_dir_size_kb
, 0, MOPT_GTE0
},
1442 static int handle_mount_opt(struct super_block
*sb
, char *opt
, int token
,
1443 substring_t
*args
, unsigned long *journal_devnum
,
1444 unsigned int *journal_ioprio
, int is_remount
)
1446 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1447 const struct mount_opts
*m
;
1453 if (token
== Opt_usrjquota
)
1454 return set_qf_name(sb
, USRQUOTA
, &args
[0]);
1455 else if (token
== Opt_grpjquota
)
1456 return set_qf_name(sb
, GRPQUOTA
, &args
[0]);
1457 else if (token
== Opt_offusrjquota
)
1458 return clear_qf_name(sb
, USRQUOTA
);
1459 else if (token
== Opt_offgrpjquota
)
1460 return clear_qf_name(sb
, GRPQUOTA
);
1464 case Opt_nouser_xattr
:
1465 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, opt
, "3.5");
1468 return 1; /* handled by get_sb_block() */
1470 ext4_msg(sb
, KERN_WARNING
, "Ignoring removed %s option", opt
);
1473 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1476 sb
->s_flags
|= MS_I_VERSION
;
1480 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++)
1481 if (token
== m
->token
)
1484 if (m
->token
== Opt_err
) {
1485 ext4_msg(sb
, KERN_ERR
, "Unrecognized mount option \"%s\" "
1486 "or missing value", opt
);
1490 if ((m
->flags
& MOPT_NO_EXT2
) && IS_EXT2_SB(sb
)) {
1491 ext4_msg(sb
, KERN_ERR
,
1492 "Mount option \"%s\" incompatible with ext2", opt
);
1495 if ((m
->flags
& MOPT_NO_EXT3
) && IS_EXT3_SB(sb
)) {
1496 ext4_msg(sb
, KERN_ERR
,
1497 "Mount option \"%s\" incompatible with ext3", opt
);
1501 if (args
->from
&& !(m
->flags
& MOPT_STRING
) && match_int(args
, &arg
))
1503 if (args
->from
&& (m
->flags
& MOPT_GTE0
) && (arg
< 0))
1505 if (m
->flags
& MOPT_EXPLICIT
)
1506 set_opt2(sb
, EXPLICIT_DELALLOC
);
1507 if (m
->flags
& MOPT_CLEAR_ERR
)
1508 clear_opt(sb
, ERRORS_MASK
);
1509 if (token
== Opt_noquota
&& sb_any_quota_loaded(sb
)) {
1510 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1511 "options when quota turned on");
1515 if (m
->flags
& MOPT_NOSUPPORT
) {
1516 ext4_msg(sb
, KERN_ERR
, "%s option not supported", opt
);
1517 } else if (token
== Opt_commit
) {
1519 arg
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1520 sbi
->s_commit_interval
= HZ
* arg
;
1521 } else if (token
== Opt_max_batch_time
) {
1523 arg
= EXT4_DEF_MAX_BATCH_TIME
;
1524 sbi
->s_max_batch_time
= arg
;
1525 } else if (token
== Opt_min_batch_time
) {
1526 sbi
->s_min_batch_time
= arg
;
1527 } else if (token
== Opt_inode_readahead_blks
) {
1528 if (arg
&& (arg
> (1 << 30) || !is_power_of_2(arg
))) {
1529 ext4_msg(sb
, KERN_ERR
,
1530 "EXT4-fs: inode_readahead_blks must be "
1531 "0 or a power of 2 smaller than 2^31");
1534 sbi
->s_inode_readahead_blks
= arg
;
1535 } else if (token
== Opt_init_itable
) {
1536 set_opt(sb
, INIT_INODE_TABLE
);
1538 arg
= EXT4_DEF_LI_WAIT_MULT
;
1539 sbi
->s_li_wait_mult
= arg
;
1540 } else if (token
== Opt_max_dir_size_kb
) {
1541 sbi
->s_max_dir_size_kb
= arg
;
1542 } else if (token
== Opt_stripe
) {
1543 sbi
->s_stripe
= arg
;
1544 } else if (token
== Opt_resuid
) {
1545 uid
= make_kuid(current_user_ns(), arg
);
1546 if (!uid_valid(uid
)) {
1547 ext4_msg(sb
, KERN_ERR
, "Invalid uid value %d", arg
);
1550 sbi
->s_resuid
= uid
;
1551 } else if (token
== Opt_resgid
) {
1552 gid
= make_kgid(current_user_ns(), arg
);
1553 if (!gid_valid(gid
)) {
1554 ext4_msg(sb
, KERN_ERR
, "Invalid gid value %d", arg
);
1557 sbi
->s_resgid
= gid
;
1558 } else if (token
== Opt_journal_dev
) {
1560 ext4_msg(sb
, KERN_ERR
,
1561 "Cannot specify journal on remount");
1564 *journal_devnum
= arg
;
1565 } else if (token
== Opt_journal_path
) {
1567 struct inode
*journal_inode
;
1572 ext4_msg(sb
, KERN_ERR
,
1573 "Cannot specify journal on remount");
1576 journal_path
= match_strdup(&args
[0]);
1577 if (!journal_path
) {
1578 ext4_msg(sb
, KERN_ERR
, "error: could not dup "
1579 "journal device string");
1583 error
= kern_path(journal_path
, LOOKUP_FOLLOW
, &path
);
1585 ext4_msg(sb
, KERN_ERR
, "error: could not find "
1586 "journal device path: error %d", error
);
1587 kfree(journal_path
);
1591 journal_inode
= path
.dentry
->d_inode
;
1592 if (!S_ISBLK(journal_inode
->i_mode
)) {
1593 ext4_msg(sb
, KERN_ERR
, "error: journal path %s "
1594 "is not a block device", journal_path
);
1596 kfree(journal_path
);
1600 *journal_devnum
= new_encode_dev(journal_inode
->i_rdev
);
1602 kfree(journal_path
);
1603 } else if (token
== Opt_journal_ioprio
) {
1605 ext4_msg(sb
, KERN_ERR
, "Invalid journal IO priority"
1610 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
, arg
);
1611 } else if (m
->flags
& MOPT_DATAJ
) {
1613 if (!sbi
->s_journal
)
1614 ext4_msg(sb
, KERN_WARNING
, "Remounting file system with no journal so ignoring journalled data option");
1615 else if (test_opt(sb
, DATA_FLAGS
) != m
->mount_opt
) {
1616 ext4_msg(sb
, KERN_ERR
,
1617 "Cannot change data mode on remount");
1621 clear_opt(sb
, DATA_FLAGS
);
1622 sbi
->s_mount_opt
|= m
->mount_opt
;
1625 } else if (m
->flags
& MOPT_QFMT
) {
1626 if (sb_any_quota_loaded(sb
) &&
1627 sbi
->s_jquota_fmt
!= m
->mount_opt
) {
1628 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled "
1629 "quota options when quota turned on");
1632 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
1633 EXT4_FEATURE_RO_COMPAT_QUOTA
)) {
1634 ext4_msg(sb
, KERN_ERR
,
1635 "Cannot set journaled quota options "
1636 "when QUOTA feature is enabled");
1639 sbi
->s_jquota_fmt
= m
->mount_opt
;
1644 if (m
->flags
& MOPT_CLEAR
)
1646 else if (unlikely(!(m
->flags
& MOPT_SET
))) {
1647 ext4_msg(sb
, KERN_WARNING
,
1648 "buggy handling of option %s", opt
);
1653 sbi
->s_mount_opt
|= m
->mount_opt
;
1655 sbi
->s_mount_opt
&= ~m
->mount_opt
;
1660 static int parse_options(char *options
, struct super_block
*sb
,
1661 unsigned long *journal_devnum
,
1662 unsigned int *journal_ioprio
,
1665 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1667 substring_t args
[MAX_OPT_ARGS
];
1673 while ((p
= strsep(&options
, ",")) != NULL
) {
1677 * Initialize args struct so we know whether arg was
1678 * found; some options take optional arguments.
1680 args
[0].to
= args
[0].from
= NULL
;
1681 token
= match_token(p
, tokens
, args
);
1682 if (handle_mount_opt(sb
, p
, token
, args
, journal_devnum
,
1683 journal_ioprio
, is_remount
) < 0)
1687 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
) &&
1688 (test_opt(sb
, USRQUOTA
) || test_opt(sb
, GRPQUOTA
))) {
1689 ext4_msg(sb
, KERN_ERR
, "Cannot set quota options when QUOTA "
1690 "feature is enabled");
1693 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1694 if (test_opt(sb
, USRQUOTA
) && sbi
->s_qf_names
[USRQUOTA
])
1695 clear_opt(sb
, USRQUOTA
);
1697 if (test_opt(sb
, GRPQUOTA
) && sbi
->s_qf_names
[GRPQUOTA
])
1698 clear_opt(sb
, GRPQUOTA
);
1700 if (test_opt(sb
, GRPQUOTA
) || test_opt(sb
, USRQUOTA
)) {
1701 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1706 if (!sbi
->s_jquota_fmt
) {
1707 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1712 if (sbi
->s_jquota_fmt
) {
1713 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1714 "specified with no journaling "
1720 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
1722 BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
1724 if (blocksize
< PAGE_CACHE_SIZE
) {
1725 ext4_msg(sb
, KERN_ERR
, "can't mount with "
1726 "dioread_nolock if block size != PAGE_SIZE");
1733 static inline void ext4_show_quota_options(struct seq_file
*seq
,
1734 struct super_block
*sb
)
1736 #if defined(CONFIG_QUOTA)
1737 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1739 if (sbi
->s_jquota_fmt
) {
1742 switch (sbi
->s_jquota_fmt
) {
1753 seq_printf(seq
, ",jqfmt=%s", fmtname
);
1756 if (sbi
->s_qf_names
[USRQUOTA
])
1757 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
1759 if (sbi
->s_qf_names
[GRPQUOTA
])
1760 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
1764 static const char *token2str(int token
)
1766 const struct match_token
*t
;
1768 for (t
= tokens
; t
->token
!= Opt_err
; t
++)
1769 if (t
->token
== token
&& !strchr(t
->pattern
, '='))
1776 * - it's set to a non-default value OR
1777 * - if the per-sb default is different from the global default
1779 static int _ext4_show_options(struct seq_file
*seq
, struct super_block
*sb
,
1782 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1783 struct ext4_super_block
*es
= sbi
->s_es
;
1784 int def_errors
, def_mount_opt
= nodefs
? 0 : sbi
->s_def_mount_opt
;
1785 const struct mount_opts
*m
;
1786 char sep
= nodefs
? '\n' : ',';
1788 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1789 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1791 if (sbi
->s_sb_block
!= 1)
1792 SEQ_OPTS_PRINT("sb=%llu", sbi
->s_sb_block
);
1794 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++) {
1795 int want_set
= m
->flags
& MOPT_SET
;
1796 if (((m
->flags
& (MOPT_SET
|MOPT_CLEAR
)) == 0) ||
1797 (m
->flags
& MOPT_CLEAR_ERR
))
1799 if (!(m
->mount_opt
& (sbi
->s_mount_opt
^ def_mount_opt
)))
1800 continue; /* skip if same as the default */
1802 (sbi
->s_mount_opt
& m
->mount_opt
) != m
->mount_opt
) ||
1803 (!want_set
&& (sbi
->s_mount_opt
& m
->mount_opt
)))
1804 continue; /* select Opt_noFoo vs Opt_Foo */
1805 SEQ_OPTS_PRINT("%s", token2str(m
->token
));
1808 if (nodefs
|| !uid_eq(sbi
->s_resuid
, make_kuid(&init_user_ns
, EXT4_DEF_RESUID
)) ||
1809 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
)
1810 SEQ_OPTS_PRINT("resuid=%u",
1811 from_kuid_munged(&init_user_ns
, sbi
->s_resuid
));
1812 if (nodefs
|| !gid_eq(sbi
->s_resgid
, make_kgid(&init_user_ns
, EXT4_DEF_RESGID
)) ||
1813 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
)
1814 SEQ_OPTS_PRINT("resgid=%u",
1815 from_kgid_munged(&init_user_ns
, sbi
->s_resgid
));
1816 def_errors
= nodefs
? -1 : le16_to_cpu(es
->s_errors
);
1817 if (test_opt(sb
, ERRORS_RO
) && def_errors
!= EXT4_ERRORS_RO
)
1818 SEQ_OPTS_PUTS("errors=remount-ro");
1819 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
1820 SEQ_OPTS_PUTS("errors=continue");
1821 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
1822 SEQ_OPTS_PUTS("errors=panic");
1823 if (nodefs
|| sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
)
1824 SEQ_OPTS_PRINT("commit=%lu", sbi
->s_commit_interval
/ HZ
);
1825 if (nodefs
|| sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
)
1826 SEQ_OPTS_PRINT("min_batch_time=%u", sbi
->s_min_batch_time
);
1827 if (nodefs
|| sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
)
1828 SEQ_OPTS_PRINT("max_batch_time=%u", sbi
->s_max_batch_time
);
1829 if (sb
->s_flags
& MS_I_VERSION
)
1830 SEQ_OPTS_PUTS("i_version");
1831 if (nodefs
|| sbi
->s_stripe
)
1832 SEQ_OPTS_PRINT("stripe=%lu", sbi
->s_stripe
);
1833 if (EXT4_MOUNT_DATA_FLAGS
& (sbi
->s_mount_opt
^ def_mount_opt
)) {
1834 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
1835 SEQ_OPTS_PUTS("data=journal");
1836 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
1837 SEQ_OPTS_PUTS("data=ordered");
1838 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
1839 SEQ_OPTS_PUTS("data=writeback");
1842 sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
1843 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1844 sbi
->s_inode_readahead_blks
);
1846 if (nodefs
|| (test_opt(sb
, INIT_INODE_TABLE
) &&
1847 (sbi
->s_li_wait_mult
!= EXT4_DEF_LI_WAIT_MULT
)))
1848 SEQ_OPTS_PRINT("init_itable=%u", sbi
->s_li_wait_mult
);
1849 if (nodefs
|| sbi
->s_max_dir_size_kb
)
1850 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi
->s_max_dir_size_kb
);
1852 ext4_show_quota_options(seq
, sb
);
1856 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
)
1858 return _ext4_show_options(seq
, root
->d_sb
, 0);
1861 static int options_seq_show(struct seq_file
*seq
, void *offset
)
1863 struct super_block
*sb
= seq
->private;
1866 seq_puts(seq
, (sb
->s_flags
& MS_RDONLY
) ? "ro" : "rw");
1867 rc
= _ext4_show_options(seq
, sb
, 1);
1868 seq_puts(seq
, "\n");
1872 static int options_open_fs(struct inode
*inode
, struct file
*file
)
1874 return single_open(file
, options_seq_show
, PDE_DATA(inode
));
1877 static const struct file_operations ext4_seq_options_fops
= {
1878 .owner
= THIS_MODULE
,
1879 .open
= options_open_fs
,
1881 .llseek
= seq_lseek
,
1882 .release
= single_release
,
1885 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1888 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1891 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1892 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
1893 "forcing read-only mode");
1898 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1899 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
1900 "running e2fsck is recommended");
1901 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1902 ext4_msg(sb
, KERN_WARNING
,
1903 "warning: mounting fs with errors, "
1904 "running e2fsck is recommended");
1905 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) > 0 &&
1906 le16_to_cpu(es
->s_mnt_count
) >=
1907 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1908 ext4_msg(sb
, KERN_WARNING
,
1909 "warning: maximal mount count reached, "
1910 "running e2fsck is recommended");
1911 else if (le32_to_cpu(es
->s_checkinterval
) &&
1912 (le32_to_cpu(es
->s_lastcheck
) +
1913 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1914 ext4_msg(sb
, KERN_WARNING
,
1915 "warning: checktime reached, "
1916 "running e2fsck is recommended");
1917 if (!sbi
->s_journal
)
1918 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1919 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1920 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1921 le16_add_cpu(&es
->s_mnt_count
, 1);
1922 es
->s_mtime
= cpu_to_le32(get_seconds());
1923 ext4_update_dynamic_rev(sb
);
1925 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1927 ext4_commit_super(sb
, 1);
1929 if (test_opt(sb
, DEBUG
))
1930 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
1931 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1933 sbi
->s_groups_count
,
1934 EXT4_BLOCKS_PER_GROUP(sb
),
1935 EXT4_INODES_PER_GROUP(sb
),
1936 sbi
->s_mount_opt
, sbi
->s_mount_opt2
);
1938 cleancache_init_fs(sb
);
1942 int ext4_alloc_flex_bg_array(struct super_block
*sb
, ext4_group_t ngroup
)
1944 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1945 struct flex_groups
*new_groups
;
1948 if (!sbi
->s_log_groups_per_flex
)
1951 size
= ext4_flex_group(sbi
, ngroup
- 1) + 1;
1952 if (size
<= sbi
->s_flex_groups_allocated
)
1955 size
= roundup_pow_of_two(size
* sizeof(struct flex_groups
));
1956 new_groups
= ext4_kvzalloc(size
, GFP_KERNEL
);
1958 ext4_msg(sb
, KERN_ERR
, "not enough memory for %d flex groups",
1959 size
/ (int) sizeof(struct flex_groups
));
1963 if (sbi
->s_flex_groups
) {
1964 memcpy(new_groups
, sbi
->s_flex_groups
,
1965 (sbi
->s_flex_groups_allocated
*
1966 sizeof(struct flex_groups
)));
1967 ext4_kvfree(sbi
->s_flex_groups
);
1969 sbi
->s_flex_groups
= new_groups
;
1970 sbi
->s_flex_groups_allocated
= size
/ sizeof(struct flex_groups
);
1974 static int ext4_fill_flex_info(struct super_block
*sb
)
1976 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1977 struct ext4_group_desc
*gdp
= NULL
;
1978 ext4_group_t flex_group
;
1981 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1982 if (sbi
->s_log_groups_per_flex
< 1 || sbi
->s_log_groups_per_flex
> 31) {
1983 sbi
->s_log_groups_per_flex
= 0;
1987 err
= ext4_alloc_flex_bg_array(sb
, sbi
->s_groups_count
);
1991 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1992 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1994 flex_group
= ext4_flex_group(sbi
, i
);
1995 atomic_add(ext4_free_inodes_count(sb
, gdp
),
1996 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
1997 atomic64_add(ext4_free_group_clusters(sb
, gdp
),
1998 &sbi
->s_flex_groups
[flex_group
].free_clusters
);
1999 atomic_add(ext4_used_dirs_count(sb
, gdp
),
2000 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
2008 static __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
2009 struct ext4_group_desc
*gdp
)
2013 __le32 le_group
= cpu_to_le32(block_group
);
2015 if ((sbi
->s_es
->s_feature_ro_compat
&
2016 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))) {
2017 /* Use new metadata_csum algorithm */
2021 save_csum
= gdp
->bg_checksum
;
2022 gdp
->bg_checksum
= 0;
2023 csum32
= ext4_chksum(sbi
, sbi
->s_csum_seed
, (__u8
*)&le_group
,
2025 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)gdp
,
2027 gdp
->bg_checksum
= save_csum
;
2029 crc
= csum32
& 0xFFFF;
2033 /* old crc16 code */
2034 offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
2036 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
2037 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
2038 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
2039 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
2040 /* for checksum of struct ext4_group_desc do the rest...*/
2041 if ((sbi
->s_es
->s_feature_incompat
&
2042 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
2043 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
2044 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
2045 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
2049 return cpu_to_le16(crc
);
2052 int ext4_group_desc_csum_verify(struct super_block
*sb
, __u32 block_group
,
2053 struct ext4_group_desc
*gdp
)
2055 if (ext4_has_group_desc_csum(sb
) &&
2056 (gdp
->bg_checksum
!= ext4_group_desc_csum(EXT4_SB(sb
),
2063 void ext4_group_desc_csum_set(struct super_block
*sb
, __u32 block_group
,
2064 struct ext4_group_desc
*gdp
)
2066 if (!ext4_has_group_desc_csum(sb
))
2068 gdp
->bg_checksum
= ext4_group_desc_csum(EXT4_SB(sb
), block_group
, gdp
);
2071 /* Called at mount-time, super-block is locked */
2072 static int ext4_check_descriptors(struct super_block
*sb
,
2073 ext4_group_t
*first_not_zeroed
)
2075 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2076 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
2077 ext4_fsblk_t last_block
;
2078 ext4_fsblk_t block_bitmap
;
2079 ext4_fsblk_t inode_bitmap
;
2080 ext4_fsblk_t inode_table
;
2081 int flexbg_flag
= 0;
2082 ext4_group_t i
, grp
= sbi
->s_groups_count
;
2084 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
2087 ext4_debug("Checking group descriptors");
2089 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
2090 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2092 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
2093 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
2095 last_block
= first_block
+
2096 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2098 if ((grp
== sbi
->s_groups_count
) &&
2099 !(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2102 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
2103 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
2104 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2105 "Block bitmap for group %u not in group "
2106 "(block %llu)!", i
, block_bitmap
);
2109 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
2110 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
2111 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2112 "Inode bitmap for group %u not in group "
2113 "(block %llu)!", i
, inode_bitmap
);
2116 inode_table
= ext4_inode_table(sb
, gdp
);
2117 if (inode_table
< first_block
||
2118 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
2119 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2120 "Inode table for group %u not in group "
2121 "(block %llu)!", i
, inode_table
);
2124 ext4_lock_group(sb
, i
);
2125 if (!ext4_group_desc_csum_verify(sb
, i
, gdp
)) {
2126 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2127 "Checksum for group %u failed (%u!=%u)",
2128 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
2129 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
2130 if (!(sb
->s_flags
& MS_RDONLY
)) {
2131 ext4_unlock_group(sb
, i
);
2135 ext4_unlock_group(sb
, i
);
2137 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
2139 if (NULL
!= first_not_zeroed
)
2140 *first_not_zeroed
= grp
;
2142 ext4_free_blocks_count_set(sbi
->s_es
,
2143 EXT4_C2B(sbi
, ext4_count_free_clusters(sb
)));
2144 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
2148 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2149 * the superblock) which were deleted from all directories, but held open by
2150 * a process at the time of a crash. We walk the list and try to delete these
2151 * inodes at recovery time (only with a read-write filesystem).
2153 * In order to keep the orphan inode chain consistent during traversal (in
2154 * case of crash during recovery), we link each inode into the superblock
2155 * orphan list_head and handle it the same way as an inode deletion during
2156 * normal operation (which journals the operations for us).
2158 * We only do an iget() and an iput() on each inode, which is very safe if we
2159 * accidentally point at an in-use or already deleted inode. The worst that
2160 * can happen in this case is that we get a "bit already cleared" message from
2161 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2162 * e2fsck was run on this filesystem, and it must have already done the orphan
2163 * inode cleanup for us, so we can safely abort without any further action.
2165 static void ext4_orphan_cleanup(struct super_block
*sb
,
2166 struct ext4_super_block
*es
)
2168 unsigned int s_flags
= sb
->s_flags
;
2169 int nr_orphans
= 0, nr_truncates
= 0;
2173 if (!es
->s_last_orphan
) {
2174 jbd_debug(4, "no orphan inodes to clean up\n");
2178 if (bdev_read_only(sb
->s_bdev
)) {
2179 ext4_msg(sb
, KERN_ERR
, "write access "
2180 "unavailable, skipping orphan cleanup");
2184 /* Check if feature set would not allow a r/w mount */
2185 if (!ext4_feature_set_ok(sb
, 0)) {
2186 ext4_msg(sb
, KERN_INFO
, "Skipping orphan cleanup due to "
2187 "unknown ROCOMPAT features");
2191 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2192 /* don't clear list on RO mount w/ errors */
2193 if (es
->s_last_orphan
&& !(s_flags
& MS_RDONLY
)) {
2194 jbd_debug(1, "Errors on filesystem, "
2195 "clearing orphan list.\n");
2196 es
->s_last_orphan
= 0;
2198 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2202 if (s_flags
& MS_RDONLY
) {
2203 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
2204 sb
->s_flags
&= ~MS_RDONLY
;
2207 /* Needed for iput() to work correctly and not trash data */
2208 sb
->s_flags
|= MS_ACTIVE
;
2209 /* Turn on quotas so that they are updated correctly */
2210 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2211 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
2212 int ret
= ext4_quota_on_mount(sb
, i
);
2214 ext4_msg(sb
, KERN_ERR
,
2215 "Cannot turn on journaled "
2216 "quota: error %d", ret
);
2221 while (es
->s_last_orphan
) {
2222 struct inode
*inode
;
2224 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
2225 if (IS_ERR(inode
)) {
2226 es
->s_last_orphan
= 0;
2230 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
2231 dquot_initialize(inode
);
2232 if (inode
->i_nlink
) {
2233 if (test_opt(sb
, DEBUG
))
2234 ext4_msg(sb
, KERN_DEBUG
,
2235 "%s: truncating inode %lu to %lld bytes",
2236 __func__
, inode
->i_ino
, inode
->i_size
);
2237 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2238 inode
->i_ino
, inode
->i_size
);
2239 mutex_lock(&inode
->i_mutex
);
2240 truncate_inode_pages(inode
->i_mapping
, inode
->i_size
);
2241 ext4_truncate(inode
);
2242 mutex_unlock(&inode
->i_mutex
);
2245 if (test_opt(sb
, DEBUG
))
2246 ext4_msg(sb
, KERN_DEBUG
,
2247 "%s: deleting unreferenced inode %lu",
2248 __func__
, inode
->i_ino
);
2249 jbd_debug(2, "deleting unreferenced inode %lu\n",
2253 iput(inode
); /* The delete magic happens here! */
2256 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2259 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
2260 PLURAL(nr_orphans
));
2262 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
2263 PLURAL(nr_truncates
));
2265 /* Turn quotas off */
2266 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2267 if (sb_dqopt(sb
)->files
[i
])
2268 dquot_quota_off(sb
, i
);
2271 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
2275 * Maximal extent format file size.
2276 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2277 * extent format containers, within a sector_t, and within i_blocks
2278 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2279 * so that won't be a limiting factor.
2281 * However there is other limiting factor. We do store extents in the form
2282 * of starting block and length, hence the resulting length of the extent
2283 * covering maximum file size must fit into on-disk format containers as
2284 * well. Given that length is always by 1 unit bigger than max unit (because
2285 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2287 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2289 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
2292 loff_t upper_limit
= MAX_LFS_FILESIZE
;
2294 /* small i_blocks in vfs inode? */
2295 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2297 * CONFIG_LBDAF is not enabled implies the inode
2298 * i_block represent total blocks in 512 bytes
2299 * 32 == size of vfs inode i_blocks * 8
2301 upper_limit
= (1LL << 32) - 1;
2303 /* total blocks in file system block size */
2304 upper_limit
>>= (blkbits
- 9);
2305 upper_limit
<<= blkbits
;
2309 * 32-bit extent-start container, ee_block. We lower the maxbytes
2310 * by one fs block, so ee_len can cover the extent of maximum file
2313 res
= (1LL << 32) - 1;
2316 /* Sanity check against vm- & vfs- imposed limits */
2317 if (res
> upper_limit
)
2324 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2325 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2326 * We need to be 1 filesystem block less than the 2^48 sector limit.
2328 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2330 loff_t res
= EXT4_NDIR_BLOCKS
;
2333 /* This is calculated to be the largest file size for a dense, block
2334 * mapped file such that the file's total number of 512-byte sectors,
2335 * including data and all indirect blocks, does not exceed (2^48 - 1).
2337 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2338 * number of 512-byte sectors of the file.
2341 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2343 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2344 * the inode i_block field represents total file blocks in
2345 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2347 upper_limit
= (1LL << 32) - 1;
2349 /* total blocks in file system block size */
2350 upper_limit
>>= (bits
- 9);
2354 * We use 48 bit ext4_inode i_blocks
2355 * With EXT4_HUGE_FILE_FL set the i_blocks
2356 * represent total number of blocks in
2357 * file system block size
2359 upper_limit
= (1LL << 48) - 1;
2363 /* indirect blocks */
2365 /* double indirect blocks */
2366 meta_blocks
+= 1 + (1LL << (bits
-2));
2367 /* tripple indirect blocks */
2368 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2370 upper_limit
-= meta_blocks
;
2371 upper_limit
<<= bits
;
2373 res
+= 1LL << (bits
-2);
2374 res
+= 1LL << (2*(bits
-2));
2375 res
+= 1LL << (3*(bits
-2));
2377 if (res
> upper_limit
)
2380 if (res
> MAX_LFS_FILESIZE
)
2381 res
= MAX_LFS_FILESIZE
;
2386 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2387 ext4_fsblk_t logical_sb_block
, int nr
)
2389 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2390 ext4_group_t bg
, first_meta_bg
;
2393 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2395 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
2397 return logical_sb_block
+ nr
+ 1;
2398 bg
= sbi
->s_desc_per_block
* nr
;
2399 if (ext4_bg_has_super(sb
, bg
))
2402 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2406 * ext4_get_stripe_size: Get the stripe size.
2407 * @sbi: In memory super block info
2409 * If we have specified it via mount option, then
2410 * use the mount option value. If the value specified at mount time is
2411 * greater than the blocks per group use the super block value.
2412 * If the super block value is greater than blocks per group return 0.
2413 * Allocator needs it be less than blocks per group.
2416 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2418 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2419 unsigned long stripe_width
=
2420 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2423 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2424 ret
= sbi
->s_stripe
;
2425 else if (stripe_width
<= sbi
->s_blocks_per_group
)
2427 else if (stride
<= sbi
->s_blocks_per_group
)
2433 * If the stripe width is 1, this makes no sense and
2434 * we set it to 0 to turn off stripe handling code.
2445 struct attribute attr
;
2446 ssize_t (*show
)(struct ext4_attr
*, struct ext4_sb_info
*, char *);
2447 ssize_t (*store
)(struct ext4_attr
*, struct ext4_sb_info
*,
2448 const char *, size_t);
2455 static int parse_strtoull(const char *buf
,
2456 unsigned long long max
, unsigned long long *value
)
2460 ret
= kstrtoull(skip_spaces(buf
), 0, value
);
2461 if (!ret
&& *value
> max
)
2466 static ssize_t
delayed_allocation_blocks_show(struct ext4_attr
*a
,
2467 struct ext4_sb_info
*sbi
,
2470 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2472 percpu_counter_sum(&sbi
->s_dirtyclusters_counter
)));
2475 static ssize_t
session_write_kbytes_show(struct ext4_attr
*a
,
2476 struct ext4_sb_info
*sbi
, char *buf
)
2478 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2480 if (!sb
->s_bdev
->bd_part
)
2481 return snprintf(buf
, PAGE_SIZE
, "0\n");
2482 return snprintf(buf
, PAGE_SIZE
, "%lu\n",
2483 (part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2484 sbi
->s_sectors_written_start
) >> 1);
2487 static ssize_t
lifetime_write_kbytes_show(struct ext4_attr
*a
,
2488 struct ext4_sb_info
*sbi
, char *buf
)
2490 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2492 if (!sb
->s_bdev
->bd_part
)
2493 return snprintf(buf
, PAGE_SIZE
, "0\n");
2494 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2495 (unsigned long long)(sbi
->s_kbytes_written
+
2496 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2497 EXT4_SB(sb
)->s_sectors_written_start
) >> 1)));
2500 static ssize_t
inode_readahead_blks_store(struct ext4_attr
*a
,
2501 struct ext4_sb_info
*sbi
,
2502 const char *buf
, size_t count
)
2507 ret
= kstrtoul(skip_spaces(buf
), 0, &t
);
2511 if (t
&& (!is_power_of_2(t
) || t
> 0x40000000))
2514 sbi
->s_inode_readahead_blks
= t
;
2518 static ssize_t
sbi_ui_show(struct ext4_attr
*a
,
2519 struct ext4_sb_info
*sbi
, char *buf
)
2521 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->u
.offset
);
2523 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
2526 static ssize_t
sbi_ui_store(struct ext4_attr
*a
,
2527 struct ext4_sb_info
*sbi
,
2528 const char *buf
, size_t count
)
2530 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->u
.offset
);
2534 ret
= kstrtoul(skip_spaces(buf
), 0, &t
);
2541 static ssize_t
reserved_clusters_show(struct ext4_attr
*a
,
2542 struct ext4_sb_info
*sbi
, char *buf
)
2544 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2545 (unsigned long long) atomic64_read(&sbi
->s_resv_clusters
));
2548 static ssize_t
reserved_clusters_store(struct ext4_attr
*a
,
2549 struct ext4_sb_info
*sbi
,
2550 const char *buf
, size_t count
)
2552 unsigned long long val
;
2555 if (parse_strtoull(buf
, -1ULL, &val
))
2557 ret
= ext4_reserve_clusters(sbi
, val
);
2559 return ret
? ret
: count
;
2562 static ssize_t
trigger_test_error(struct ext4_attr
*a
,
2563 struct ext4_sb_info
*sbi
,
2564 const char *buf
, size_t count
)
2568 if (!capable(CAP_SYS_ADMIN
))
2571 if (len
&& buf
[len
-1] == '\n')
2575 ext4_error(sbi
->s_sb
, "%.*s", len
, buf
);
2579 static ssize_t
sbi_deprecated_show(struct ext4_attr
*a
,
2580 struct ext4_sb_info
*sbi
, char *buf
)
2582 return snprintf(buf
, PAGE_SIZE
, "%d\n", a
->u
.deprecated_val
);
2585 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2586 static struct ext4_attr ext4_attr_##_name = { \
2587 .attr = {.name = __stringify(_name), .mode = _mode }, \
2591 .offset = offsetof(struct ext4_sb_info, _elname),\
2594 #define EXT4_ATTR(name, mode, show, store) \
2595 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2597 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2598 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2599 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2600 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2601 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2602 #define ATTR_LIST(name) &ext4_attr_##name.attr
2603 #define EXT4_DEPRECATED_ATTR(_name, _val) \
2604 static struct ext4_attr ext4_attr_##_name = { \
2605 .attr = {.name = __stringify(_name), .mode = 0444 }, \
2606 .show = sbi_deprecated_show, \
2608 .deprecated_val = _val, \
2612 EXT4_RO_ATTR(delayed_allocation_blocks
);
2613 EXT4_RO_ATTR(session_write_kbytes
);
2614 EXT4_RO_ATTR(lifetime_write_kbytes
);
2615 EXT4_RW_ATTR(reserved_clusters
);
2616 EXT4_ATTR_OFFSET(inode_readahead_blks
, 0644, sbi_ui_show
,
2617 inode_readahead_blks_store
, s_inode_readahead_blks
);
2618 EXT4_RW_ATTR_SBI_UI(inode_goal
, s_inode_goal
);
2619 EXT4_RW_ATTR_SBI_UI(mb_stats
, s_mb_stats
);
2620 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan
, s_mb_max_to_scan
);
2621 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan
, s_mb_min_to_scan
);
2622 EXT4_RW_ATTR_SBI_UI(mb_order2_req
, s_mb_order2_reqs
);
2623 EXT4_RW_ATTR_SBI_UI(mb_stream_req
, s_mb_stream_request
);
2624 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc
, s_mb_group_prealloc
);
2625 EXT4_DEPRECATED_ATTR(max_writeback_mb_bump
, 128);
2626 EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb
, s_extent_max_zeroout_kb
);
2627 EXT4_ATTR(trigger_fs_error
, 0200, NULL
, trigger_test_error
);
2628 EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms
, s_err_ratelimit_state
.interval
);
2629 EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst
, s_err_ratelimit_state
.burst
);
2630 EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms
, s_warning_ratelimit_state
.interval
);
2631 EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst
, s_warning_ratelimit_state
.burst
);
2632 EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms
, s_msg_ratelimit_state
.interval
);
2633 EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst
, s_msg_ratelimit_state
.burst
);
2635 static struct attribute
*ext4_attrs
[] = {
2636 ATTR_LIST(delayed_allocation_blocks
),
2637 ATTR_LIST(session_write_kbytes
),
2638 ATTR_LIST(lifetime_write_kbytes
),
2639 ATTR_LIST(reserved_clusters
),
2640 ATTR_LIST(inode_readahead_blks
),
2641 ATTR_LIST(inode_goal
),
2642 ATTR_LIST(mb_stats
),
2643 ATTR_LIST(mb_max_to_scan
),
2644 ATTR_LIST(mb_min_to_scan
),
2645 ATTR_LIST(mb_order2_req
),
2646 ATTR_LIST(mb_stream_req
),
2647 ATTR_LIST(mb_group_prealloc
),
2648 ATTR_LIST(max_writeback_mb_bump
),
2649 ATTR_LIST(extent_max_zeroout_kb
),
2650 ATTR_LIST(trigger_fs_error
),
2651 ATTR_LIST(err_ratelimit_interval_ms
),
2652 ATTR_LIST(err_ratelimit_burst
),
2653 ATTR_LIST(warning_ratelimit_interval_ms
),
2654 ATTR_LIST(warning_ratelimit_burst
),
2655 ATTR_LIST(msg_ratelimit_interval_ms
),
2656 ATTR_LIST(msg_ratelimit_burst
),
2660 /* Features this copy of ext4 supports */
2661 EXT4_INFO_ATTR(lazy_itable_init
);
2662 EXT4_INFO_ATTR(batched_discard
);
2663 EXT4_INFO_ATTR(meta_bg_resize
);
2665 static struct attribute
*ext4_feat_attrs
[] = {
2666 ATTR_LIST(lazy_itable_init
),
2667 ATTR_LIST(batched_discard
),
2668 ATTR_LIST(meta_bg_resize
),
2672 static ssize_t
ext4_attr_show(struct kobject
*kobj
,
2673 struct attribute
*attr
, char *buf
)
2675 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2677 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2679 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
2682 static ssize_t
ext4_attr_store(struct kobject
*kobj
,
2683 struct attribute
*attr
,
2684 const char *buf
, size_t len
)
2686 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2688 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2690 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
2693 static void ext4_sb_release(struct kobject
*kobj
)
2695 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2697 complete(&sbi
->s_kobj_unregister
);
2700 static const struct sysfs_ops ext4_attr_ops
= {
2701 .show
= ext4_attr_show
,
2702 .store
= ext4_attr_store
,
2705 static struct kobj_type ext4_ktype
= {
2706 .default_attrs
= ext4_attrs
,
2707 .sysfs_ops
= &ext4_attr_ops
,
2708 .release
= ext4_sb_release
,
2711 static void ext4_feat_release(struct kobject
*kobj
)
2713 complete(&ext4_feat
->f_kobj_unregister
);
2716 static struct kobj_type ext4_feat_ktype
= {
2717 .default_attrs
= ext4_feat_attrs
,
2718 .sysfs_ops
= &ext4_attr_ops
,
2719 .release
= ext4_feat_release
,
2723 * Check whether this filesystem can be mounted based on
2724 * the features present and the RDONLY/RDWR mount requested.
2725 * Returns 1 if this filesystem can be mounted as requested,
2726 * 0 if it cannot be.
2728 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2730 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
)) {
2731 ext4_msg(sb
, KERN_ERR
,
2732 "Couldn't mount because of "
2733 "unsupported optional features (%x)",
2734 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2735 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2742 /* Check that feature set is OK for a read-write mount */
2743 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
)) {
2744 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2745 "unsupported optional features (%x)",
2746 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2747 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2751 * Large file size enabled file system can only be mounted
2752 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2754 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
2755 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2756 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2757 "cannot be mounted RDWR without "
2762 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_BIGALLOC
) &&
2763 !EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_EXTENTS
)) {
2764 ext4_msg(sb
, KERN_ERR
,
2765 "Can't support bigalloc feature without "
2766 "extents feature\n");
2770 #ifndef CONFIG_QUOTA
2771 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
) &&
2773 ext4_msg(sb
, KERN_ERR
,
2774 "Filesystem with quota feature cannot be mounted RDWR "
2775 "without CONFIG_QUOTA");
2778 #endif /* CONFIG_QUOTA */
2783 * This function is called once a day if we have errors logged
2784 * on the file system
2786 static void print_daily_error_info(unsigned long arg
)
2788 struct super_block
*sb
= (struct super_block
*) arg
;
2789 struct ext4_sb_info
*sbi
;
2790 struct ext4_super_block
*es
;
2795 if (es
->s_error_count
)
2796 ext4_msg(sb
, KERN_NOTICE
, "error count: %u",
2797 le32_to_cpu(es
->s_error_count
));
2798 if (es
->s_first_error_time
) {
2799 printk(KERN_NOTICE
"EXT4-fs (%s): initial error at %u: %.*s:%d",
2800 sb
->s_id
, le32_to_cpu(es
->s_first_error_time
),
2801 (int) sizeof(es
->s_first_error_func
),
2802 es
->s_first_error_func
,
2803 le32_to_cpu(es
->s_first_error_line
));
2804 if (es
->s_first_error_ino
)
2805 printk(": inode %u",
2806 le32_to_cpu(es
->s_first_error_ino
));
2807 if (es
->s_first_error_block
)
2808 printk(": block %llu", (unsigned long long)
2809 le64_to_cpu(es
->s_first_error_block
));
2812 if (es
->s_last_error_time
) {
2813 printk(KERN_NOTICE
"EXT4-fs (%s): last error at %u: %.*s:%d",
2814 sb
->s_id
, le32_to_cpu(es
->s_last_error_time
),
2815 (int) sizeof(es
->s_last_error_func
),
2816 es
->s_last_error_func
,
2817 le32_to_cpu(es
->s_last_error_line
));
2818 if (es
->s_last_error_ino
)
2819 printk(": inode %u",
2820 le32_to_cpu(es
->s_last_error_ino
));
2821 if (es
->s_last_error_block
)
2822 printk(": block %llu", (unsigned long long)
2823 le64_to_cpu(es
->s_last_error_block
));
2826 mod_timer(&sbi
->s_err_report
, jiffies
+ 24*60*60*HZ
); /* Once a day */
2829 /* Find next suitable group and run ext4_init_inode_table */
2830 static int ext4_run_li_request(struct ext4_li_request
*elr
)
2832 struct ext4_group_desc
*gdp
= NULL
;
2833 ext4_group_t group
, ngroups
;
2834 struct super_block
*sb
;
2835 unsigned long timeout
= 0;
2839 ngroups
= EXT4_SB(sb
)->s_groups_count
;
2842 for (group
= elr
->lr_next_group
; group
< ngroups
; group
++) {
2843 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2849 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2853 if (group
>= ngroups
)
2858 ret
= ext4_init_inode_table(sb
, group
,
2859 elr
->lr_timeout
? 0 : 1);
2860 if (elr
->lr_timeout
== 0) {
2861 timeout
= (jiffies
- timeout
) *
2862 elr
->lr_sbi
->s_li_wait_mult
;
2863 elr
->lr_timeout
= timeout
;
2865 elr
->lr_next_sched
= jiffies
+ elr
->lr_timeout
;
2866 elr
->lr_next_group
= group
+ 1;
2874 * Remove lr_request from the list_request and free the
2875 * request structure. Should be called with li_list_mtx held
2877 static void ext4_remove_li_request(struct ext4_li_request
*elr
)
2879 struct ext4_sb_info
*sbi
;
2886 list_del(&elr
->lr_request
);
2887 sbi
->s_li_request
= NULL
;
2891 static void ext4_unregister_li_request(struct super_block
*sb
)
2893 mutex_lock(&ext4_li_mtx
);
2894 if (!ext4_li_info
) {
2895 mutex_unlock(&ext4_li_mtx
);
2899 mutex_lock(&ext4_li_info
->li_list_mtx
);
2900 ext4_remove_li_request(EXT4_SB(sb
)->s_li_request
);
2901 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2902 mutex_unlock(&ext4_li_mtx
);
2905 static struct task_struct
*ext4_lazyinit_task
;
2908 * This is the function where ext4lazyinit thread lives. It walks
2909 * through the request list searching for next scheduled filesystem.
2910 * When such a fs is found, run the lazy initialization request
2911 * (ext4_rn_li_request) and keep track of the time spend in this
2912 * function. Based on that time we compute next schedule time of
2913 * the request. When walking through the list is complete, compute
2914 * next waking time and put itself into sleep.
2916 static int ext4_lazyinit_thread(void *arg
)
2918 struct ext4_lazy_init
*eli
= (struct ext4_lazy_init
*)arg
;
2919 struct list_head
*pos
, *n
;
2920 struct ext4_li_request
*elr
;
2921 unsigned long next_wakeup
, cur
;
2923 BUG_ON(NULL
== eli
);
2927 next_wakeup
= MAX_JIFFY_OFFSET
;
2929 mutex_lock(&eli
->li_list_mtx
);
2930 if (list_empty(&eli
->li_request_list
)) {
2931 mutex_unlock(&eli
->li_list_mtx
);
2935 list_for_each_safe(pos
, n
, &eli
->li_request_list
) {
2936 elr
= list_entry(pos
, struct ext4_li_request
,
2939 if (time_after_eq(jiffies
, elr
->lr_next_sched
)) {
2940 if (ext4_run_li_request(elr
) != 0) {
2941 /* error, remove the lazy_init job */
2942 ext4_remove_li_request(elr
);
2947 if (time_before(elr
->lr_next_sched
, next_wakeup
))
2948 next_wakeup
= elr
->lr_next_sched
;
2950 mutex_unlock(&eli
->li_list_mtx
);
2955 if ((time_after_eq(cur
, next_wakeup
)) ||
2956 (MAX_JIFFY_OFFSET
== next_wakeup
)) {
2961 schedule_timeout_interruptible(next_wakeup
- cur
);
2963 if (kthread_should_stop()) {
2964 ext4_clear_request_list();
2971 * It looks like the request list is empty, but we need
2972 * to check it under the li_list_mtx lock, to prevent any
2973 * additions into it, and of course we should lock ext4_li_mtx
2974 * to atomically free the list and ext4_li_info, because at
2975 * this point another ext4 filesystem could be registering
2978 mutex_lock(&ext4_li_mtx
);
2979 mutex_lock(&eli
->li_list_mtx
);
2980 if (!list_empty(&eli
->li_request_list
)) {
2981 mutex_unlock(&eli
->li_list_mtx
);
2982 mutex_unlock(&ext4_li_mtx
);
2985 mutex_unlock(&eli
->li_list_mtx
);
2986 kfree(ext4_li_info
);
2987 ext4_li_info
= NULL
;
2988 mutex_unlock(&ext4_li_mtx
);
2993 static void ext4_clear_request_list(void)
2995 struct list_head
*pos
, *n
;
2996 struct ext4_li_request
*elr
;
2998 mutex_lock(&ext4_li_info
->li_list_mtx
);
2999 list_for_each_safe(pos
, n
, &ext4_li_info
->li_request_list
) {
3000 elr
= list_entry(pos
, struct ext4_li_request
,
3002 ext4_remove_li_request(elr
);
3004 mutex_unlock(&ext4_li_info
->li_list_mtx
);
3007 static int ext4_run_lazyinit_thread(void)
3009 ext4_lazyinit_task
= kthread_run(ext4_lazyinit_thread
,
3010 ext4_li_info
, "ext4lazyinit");
3011 if (IS_ERR(ext4_lazyinit_task
)) {
3012 int err
= PTR_ERR(ext4_lazyinit_task
);
3013 ext4_clear_request_list();
3014 kfree(ext4_li_info
);
3015 ext4_li_info
= NULL
;
3016 printk(KERN_CRIT
"EXT4-fs: error %d creating inode table "
3017 "initialization thread\n",
3021 ext4_li_info
->li_state
|= EXT4_LAZYINIT_RUNNING
;
3026 * Check whether it make sense to run itable init. thread or not.
3027 * If there is at least one uninitialized inode table, return
3028 * corresponding group number, else the loop goes through all
3029 * groups and return total number of groups.
3031 static ext4_group_t
ext4_has_uninit_itable(struct super_block
*sb
)
3033 ext4_group_t group
, ngroups
= EXT4_SB(sb
)->s_groups_count
;
3034 struct ext4_group_desc
*gdp
= NULL
;
3036 for (group
= 0; group
< ngroups
; group
++) {
3037 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
3041 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
3048 static int ext4_li_info_new(void)
3050 struct ext4_lazy_init
*eli
= NULL
;
3052 eli
= kzalloc(sizeof(*eli
), GFP_KERNEL
);
3056 INIT_LIST_HEAD(&eli
->li_request_list
);
3057 mutex_init(&eli
->li_list_mtx
);
3059 eli
->li_state
|= EXT4_LAZYINIT_QUIT
;
3066 static struct ext4_li_request
*ext4_li_request_new(struct super_block
*sb
,
3069 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3070 struct ext4_li_request
*elr
;
3072 elr
= kzalloc(sizeof(*elr
), GFP_KERNEL
);
3078 elr
->lr_next_group
= start
;
3081 * Randomize first schedule time of the request to
3082 * spread the inode table initialization requests
3085 elr
->lr_next_sched
= jiffies
+ (prandom_u32() %
3086 (EXT4_DEF_LI_MAX_START_DELAY
* HZ
));
3090 int ext4_register_li_request(struct super_block
*sb
,
3091 ext4_group_t first_not_zeroed
)
3093 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3094 struct ext4_li_request
*elr
= NULL
;
3095 ext4_group_t ngroups
= EXT4_SB(sb
)->s_groups_count
;
3098 mutex_lock(&ext4_li_mtx
);
3099 if (sbi
->s_li_request
!= NULL
) {
3101 * Reset timeout so it can be computed again, because
3102 * s_li_wait_mult might have changed.
3104 sbi
->s_li_request
->lr_timeout
= 0;
3108 if (first_not_zeroed
== ngroups
||
3109 (sb
->s_flags
& MS_RDONLY
) ||
3110 !test_opt(sb
, INIT_INODE_TABLE
))
3113 elr
= ext4_li_request_new(sb
, first_not_zeroed
);
3119 if (NULL
== ext4_li_info
) {
3120 ret
= ext4_li_info_new();
3125 mutex_lock(&ext4_li_info
->li_list_mtx
);
3126 list_add(&elr
->lr_request
, &ext4_li_info
->li_request_list
);
3127 mutex_unlock(&ext4_li_info
->li_list_mtx
);
3129 sbi
->s_li_request
= elr
;
3131 * set elr to NULL here since it has been inserted to
3132 * the request_list and the removal and free of it is
3133 * handled by ext4_clear_request_list from now on.
3137 if (!(ext4_li_info
->li_state
& EXT4_LAZYINIT_RUNNING
)) {
3138 ret
= ext4_run_lazyinit_thread();
3143 mutex_unlock(&ext4_li_mtx
);
3150 * We do not need to lock anything since this is called on
3153 static void ext4_destroy_lazyinit_thread(void)
3156 * If thread exited earlier
3157 * there's nothing to be done.
3159 if (!ext4_li_info
|| !ext4_lazyinit_task
)
3162 kthread_stop(ext4_lazyinit_task
);
3165 static int set_journal_csum_feature_set(struct super_block
*sb
)
3168 int compat
, incompat
;
3169 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3171 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3172 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
)) {
3173 /* journal checksum v2 */
3175 incompat
= JBD2_FEATURE_INCOMPAT_CSUM_V2
;
3177 /* journal checksum v1 */
3178 compat
= JBD2_FEATURE_COMPAT_CHECKSUM
;
3182 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
3183 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3185 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
|
3187 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
3188 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3191 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3192 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3194 jbd2_journal_clear_features(sbi
->s_journal
,
3195 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
3196 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
|
3197 JBD2_FEATURE_INCOMPAT_CSUM_V2
);
3204 * Note: calculating the overhead so we can be compatible with
3205 * historical BSD practice is quite difficult in the face of
3206 * clusters/bigalloc. This is because multiple metadata blocks from
3207 * different block group can end up in the same allocation cluster.
3208 * Calculating the exact overhead in the face of clustered allocation
3209 * requires either O(all block bitmaps) in memory or O(number of block
3210 * groups**2) in time. We will still calculate the superblock for
3211 * older file systems --- and if we come across with a bigalloc file
3212 * system with zero in s_overhead_clusters the estimate will be close to
3213 * correct especially for very large cluster sizes --- but for newer
3214 * file systems, it's better to calculate this figure once at mkfs
3215 * time, and store it in the superblock. If the superblock value is
3216 * present (even for non-bigalloc file systems), we will use it.
3218 static int count_overhead(struct super_block
*sb
, ext4_group_t grp
,
3221 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3222 struct ext4_group_desc
*gdp
;
3223 ext4_fsblk_t first_block
, last_block
, b
;
3224 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3225 int s
, j
, count
= 0;
3227 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_BIGALLOC
))
3228 return (ext4_bg_has_super(sb
, grp
) + ext4_bg_num_gdb(sb
, grp
) +
3229 sbi
->s_itb_per_group
+ 2);
3231 first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
) +
3232 (grp
* EXT4_BLOCKS_PER_GROUP(sb
));
3233 last_block
= first_block
+ EXT4_BLOCKS_PER_GROUP(sb
) - 1;
3234 for (i
= 0; i
< ngroups
; i
++) {
3235 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
3236 b
= ext4_block_bitmap(sb
, gdp
);
3237 if (b
>= first_block
&& b
<= last_block
) {
3238 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3241 b
= ext4_inode_bitmap(sb
, gdp
);
3242 if (b
>= first_block
&& b
<= last_block
) {
3243 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3246 b
= ext4_inode_table(sb
, gdp
);
3247 if (b
>= first_block
&& b
+ sbi
->s_itb_per_group
<= last_block
)
3248 for (j
= 0; j
< sbi
->s_itb_per_group
; j
++, b
++) {
3249 int c
= EXT4_B2C(sbi
, b
- first_block
);
3250 ext4_set_bit(c
, buf
);
3256 if (ext4_bg_has_super(sb
, grp
)) {
3257 ext4_set_bit(s
++, buf
);
3260 for (j
= ext4_bg_num_gdb(sb
, grp
); j
> 0; j
--) {
3261 ext4_set_bit(EXT4_B2C(sbi
, s
++), buf
);
3267 return EXT4_CLUSTERS_PER_GROUP(sb
) -
3268 ext4_count_free(buf
, EXT4_CLUSTERS_PER_GROUP(sb
) / 8);
3272 * Compute the overhead and stash it in sbi->s_overhead
3274 int ext4_calculate_overhead(struct super_block
*sb
)
3276 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3277 struct ext4_super_block
*es
= sbi
->s_es
;
3278 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3279 ext4_fsblk_t overhead
= 0;
3280 char *buf
= (char *) get_zeroed_page(GFP_KERNEL
);
3286 * Compute the overhead (FS structures). This is constant
3287 * for a given filesystem unless the number of block groups
3288 * changes so we cache the previous value until it does.
3292 * All of the blocks before first_data_block are overhead
3294 overhead
= EXT4_B2C(sbi
, le32_to_cpu(es
->s_first_data_block
));
3297 * Add the overhead found in each block group
3299 for (i
= 0; i
< ngroups
; i
++) {
3302 blks
= count_overhead(sb
, i
, buf
);
3305 memset(buf
, 0, PAGE_SIZE
);
3308 /* Add the journal blocks as well */
3310 overhead
+= EXT4_NUM_B2C(sbi
, sbi
->s_journal
->j_maxlen
);
3312 sbi
->s_overhead
= overhead
;
3314 free_page((unsigned long) buf
);
3319 static ext4_fsblk_t
ext4_calculate_resv_clusters(struct super_block
*sb
)
3321 ext4_fsblk_t resv_clusters
;
3324 * There's no need to reserve anything when we aren't using extents.
3325 * The space estimates are exact, there are no unwritten extents,
3326 * hole punching doesn't need new metadata... This is needed especially
3327 * to keep ext2/3 backward compatibility.
3329 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_EXTENTS
))
3332 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3333 * This should cover the situations where we can not afford to run
3334 * out of space like for example punch hole, or converting
3335 * uninitialized extents in delalloc path. In most cases such
3336 * allocation would require 1, or 2 blocks, higher numbers are
3339 resv_clusters
= ext4_blocks_count(EXT4_SB(sb
)->s_es
) >>
3340 EXT4_SB(sb
)->s_cluster_bits
;
3342 do_div(resv_clusters
, 50);
3343 resv_clusters
= min_t(ext4_fsblk_t
, resv_clusters
, 4096);
3345 return resv_clusters
;
3349 static int ext4_reserve_clusters(struct ext4_sb_info
*sbi
, ext4_fsblk_t count
)
3351 ext4_fsblk_t clusters
= ext4_blocks_count(sbi
->s_es
) >>
3352 sbi
->s_cluster_bits
;
3354 if (count
>= clusters
)
3357 atomic64_set(&sbi
->s_resv_clusters
, count
);
3361 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
3363 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
3364 struct buffer_head
*bh
;
3365 struct ext4_super_block
*es
= NULL
;
3366 struct ext4_sb_info
*sbi
;
3368 ext4_fsblk_t sb_block
= get_sb_block(&data
);
3369 ext4_fsblk_t logical_sb_block
;
3370 unsigned long offset
= 0;
3371 unsigned long journal_devnum
= 0;
3372 unsigned long def_mount_opts
;
3377 int blocksize
, clustersize
;
3378 unsigned int db_count
;
3380 int needs_recovery
, has_huge_files
, has_bigalloc
;
3383 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3384 ext4_group_t first_not_zeroed
;
3386 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
3390 sbi
->s_blockgroup_lock
=
3391 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
3392 if (!sbi
->s_blockgroup_lock
) {
3396 sb
->s_fs_info
= sbi
;
3398 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
3399 sbi
->s_sb_block
= sb_block
;
3400 if (sb
->s_bdev
->bd_part
)
3401 sbi
->s_sectors_written_start
=
3402 part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]);
3404 /* Cleanup superblock name */
3405 for (cp
= sb
->s_id
; (cp
= strchr(cp
, '/'));)
3408 /* -EINVAL is default */
3410 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
3412 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
3417 * The ext4 superblock will not be buffer aligned for other than 1kB
3418 * block sizes. We need to calculate the offset from buffer start.
3420 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
3421 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3422 offset
= do_div(logical_sb_block
, blocksize
);
3424 logical_sb_block
= sb_block
;
3427 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
3428 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
3432 * Note: s_es must be initialized as soon as possible because
3433 * some ext4 macro-instructions depend on its value
3435 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
3437 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
3438 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
3440 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
3442 /* Warn if metadata_csum and gdt_csum are both set. */
3443 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3444 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
) &&
3445 EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_GDT_CSUM
))
3446 ext4_warning(sb
, KERN_INFO
"metadata_csum and uninit_bg are "
3447 "redundant flags; please run fsck.");
3449 /* Check for a known checksum algorithm */
3450 if (!ext4_verify_csum_type(sb
, es
)) {
3451 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3452 "unknown checksum algorithm.");
3457 /* Load the checksum driver */
3458 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3459 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
)) {
3460 sbi
->s_chksum_driver
= crypto_alloc_shash("crc32c", 0, 0);
3461 if (IS_ERR(sbi
->s_chksum_driver
)) {
3462 ext4_msg(sb
, KERN_ERR
, "Cannot load crc32c driver.");
3463 ret
= PTR_ERR(sbi
->s_chksum_driver
);
3464 sbi
->s_chksum_driver
= NULL
;
3469 /* Check superblock checksum */
3470 if (!ext4_superblock_csum_verify(sb
, es
)) {
3471 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3472 "invalid superblock checksum. Run e2fsck?");
3477 /* Precompute checksum seed for all metadata */
3478 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3479 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))
3480 sbi
->s_csum_seed
= ext4_chksum(sbi
, ~0, es
->s_uuid
,
3481 sizeof(es
->s_uuid
));
3483 /* Set defaults before we parse the mount options */
3484 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
3485 set_opt(sb
, INIT_INODE_TABLE
);
3486 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
3488 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
3490 if (def_mount_opts
& EXT4_DEFM_UID16
)
3491 set_opt(sb
, NO_UID32
);
3492 /* xattr user namespace & acls are now defaulted on */
3493 set_opt(sb
, XATTR_USER
);
3494 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3495 set_opt(sb
, POSIX_ACL
);
3497 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
3498 set_opt(sb
, JOURNAL_DATA
);
3499 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
3500 set_opt(sb
, ORDERED_DATA
);
3501 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
3502 set_opt(sb
, WRITEBACK_DATA
);
3504 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
3505 set_opt(sb
, ERRORS_PANIC
);
3506 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
3507 set_opt(sb
, ERRORS_CONT
);
3509 set_opt(sb
, ERRORS_RO
);
3510 if (def_mount_opts
& EXT4_DEFM_BLOCK_VALIDITY
)
3511 set_opt(sb
, BLOCK_VALIDITY
);
3512 if (def_mount_opts
& EXT4_DEFM_DISCARD
)
3513 set_opt(sb
, DISCARD
);
3515 sbi
->s_resuid
= make_kuid(&init_user_ns
, le16_to_cpu(es
->s_def_resuid
));
3516 sbi
->s_resgid
= make_kgid(&init_user_ns
, le16_to_cpu(es
->s_def_resgid
));
3517 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
3518 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
3519 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
3521 if ((def_mount_opts
& EXT4_DEFM_NOBARRIER
) == 0)
3522 set_opt(sb
, BARRIER
);
3525 * enable delayed allocation by default
3526 * Use -o nodelalloc to turn it off
3528 if (!IS_EXT3_SB(sb
) && !IS_EXT2_SB(sb
) &&
3529 ((def_mount_opts
& EXT4_DEFM_NODELALLOC
) == 0))
3530 set_opt(sb
, DELALLOC
);
3533 * set default s_li_wait_mult for lazyinit, for the case there is
3534 * no mount option specified.
3536 sbi
->s_li_wait_mult
= EXT4_DEF_LI_WAIT_MULT
;
3538 if (!parse_options((char *) sbi
->s_es
->s_mount_opts
, sb
,
3539 &journal_devnum
, &journal_ioprio
, 0)) {
3540 ext4_msg(sb
, KERN_WARNING
,
3541 "failed to parse options in superblock: %s",
3542 sbi
->s_es
->s_mount_opts
);
3544 sbi
->s_def_mount_opt
= sbi
->s_mount_opt
;
3545 if (!parse_options((char *) data
, sb
, &journal_devnum
,
3546 &journal_ioprio
, 0))
3549 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
3550 printk_once(KERN_WARNING
"EXT4-fs: Warning: mounting "
3551 "with data=journal disables delayed "
3552 "allocation and O_DIRECT support!\n");
3553 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
3554 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3555 "both data=journal and delalloc");
3558 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
3559 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3560 "both data=journal and dioread_nolock");
3563 if (test_opt(sb
, DELALLOC
))
3564 clear_opt(sb
, DELALLOC
);
3567 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3568 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
3570 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
3571 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
3572 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
3573 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
3574 ext4_msg(sb
, KERN_WARNING
,
3575 "feature flags set on rev 0 fs, "
3576 "running e2fsck is recommended");
3578 if (IS_EXT2_SB(sb
)) {
3579 if (ext2_feature_set_ok(sb
))
3580 ext4_msg(sb
, KERN_INFO
, "mounting ext2 file system "
3581 "using the ext4 subsystem");
3583 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext2 due "
3584 "to feature incompatibilities");
3589 if (IS_EXT3_SB(sb
)) {
3590 if (ext3_feature_set_ok(sb
))
3591 ext4_msg(sb
, KERN_INFO
, "mounting ext3 file system "
3592 "using the ext4 subsystem");
3594 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext3 due "
3595 "to feature incompatibilities");
3601 * Check feature flags regardless of the revision level, since we
3602 * previously didn't change the revision level when setting the flags,
3603 * so there is a chance incompat flags are set on a rev 0 filesystem.
3605 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
3608 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
3609 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
3610 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
3611 ext4_msg(sb
, KERN_ERR
,
3612 "Unsupported filesystem blocksize %d", blocksize
);
3616 if (sb
->s_blocksize
!= blocksize
) {
3617 /* Validate the filesystem blocksize */
3618 if (!sb_set_blocksize(sb
, blocksize
)) {
3619 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
3625 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3626 offset
= do_div(logical_sb_block
, blocksize
);
3627 bh
= sb_bread(sb
, logical_sb_block
);
3629 ext4_msg(sb
, KERN_ERR
,
3630 "Can't read superblock on 2nd try");
3633 es
= (struct ext4_super_block
*)(bh
->b_data
+ offset
);
3635 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
3636 ext4_msg(sb
, KERN_ERR
,
3637 "Magic mismatch, very weird!");
3642 has_huge_files
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3643 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
);
3644 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
3646 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
3648 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
3649 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
3650 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
3652 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
3653 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
3654 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
3655 (!is_power_of_2(sbi
->s_inode_size
)) ||
3656 (sbi
->s_inode_size
> blocksize
)) {
3657 ext4_msg(sb
, KERN_ERR
,
3658 "unsupported inode size: %d",
3662 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
3663 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
3666 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
3667 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
3668 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
3669 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
3670 !is_power_of_2(sbi
->s_desc_size
)) {
3671 ext4_msg(sb
, KERN_ERR
,
3672 "unsupported descriptor size %lu",
3677 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
3679 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
3680 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
3681 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
3684 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
3685 if (sbi
->s_inodes_per_block
== 0)
3687 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
3688 sbi
->s_inodes_per_block
;
3689 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
3691 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3692 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
3693 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
3695 for (i
= 0; i
< 4; i
++)
3696 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
3697 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
3698 i
= le32_to_cpu(es
->s_flags
);
3699 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
3700 sbi
->s_hash_unsigned
= 3;
3701 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
3702 #ifdef __CHAR_UNSIGNED__
3703 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
3704 sbi
->s_hash_unsigned
= 3;
3706 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
3710 /* Handle clustersize */
3711 clustersize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_cluster_size
);
3712 has_bigalloc
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3713 EXT4_FEATURE_RO_COMPAT_BIGALLOC
);
3715 if (clustersize
< blocksize
) {
3716 ext4_msg(sb
, KERN_ERR
,
3717 "cluster size (%d) smaller than "
3718 "block size (%d)", clustersize
, blocksize
);
3721 sbi
->s_cluster_bits
= le32_to_cpu(es
->s_log_cluster_size
) -
3722 le32_to_cpu(es
->s_log_block_size
);
3723 sbi
->s_clusters_per_group
=
3724 le32_to_cpu(es
->s_clusters_per_group
);
3725 if (sbi
->s_clusters_per_group
> blocksize
* 8) {
3726 ext4_msg(sb
, KERN_ERR
,
3727 "#clusters per group too big: %lu",
3728 sbi
->s_clusters_per_group
);
3731 if (sbi
->s_blocks_per_group
!=
3732 (sbi
->s_clusters_per_group
* (clustersize
/ blocksize
))) {
3733 ext4_msg(sb
, KERN_ERR
, "blocks per group (%lu) and "
3734 "clusters per group (%lu) inconsistent",
3735 sbi
->s_blocks_per_group
,
3736 sbi
->s_clusters_per_group
);
3740 if (clustersize
!= blocksize
) {
3741 ext4_warning(sb
, "fragment/cluster size (%d) != "
3742 "block size (%d)", clustersize
,
3744 clustersize
= blocksize
;
3746 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
3747 ext4_msg(sb
, KERN_ERR
,
3748 "#blocks per group too big: %lu",
3749 sbi
->s_blocks_per_group
);
3752 sbi
->s_clusters_per_group
= sbi
->s_blocks_per_group
;
3753 sbi
->s_cluster_bits
= 0;
3755 sbi
->s_cluster_ratio
= clustersize
/ blocksize
;
3757 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
3758 ext4_msg(sb
, KERN_ERR
,
3759 "#inodes per group too big: %lu",
3760 sbi
->s_inodes_per_group
);
3764 /* Do we have standard group size of clustersize * 8 blocks ? */
3765 if (sbi
->s_blocks_per_group
== clustersize
<< 3)
3766 set_opt2(sb
, STD_GROUP_SIZE
);
3769 * Test whether we have more sectors than will fit in sector_t,
3770 * and whether the max offset is addressable by the page cache.
3772 err
= generic_check_addressable(sb
->s_blocksize_bits
,
3773 ext4_blocks_count(es
));
3775 ext4_msg(sb
, KERN_ERR
, "filesystem"
3776 " too large to mount safely on this system");
3777 if (sizeof(sector_t
) < 8)
3778 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
3782 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
3785 /* check blocks count against device size */
3786 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
3787 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
3788 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
3789 "exceeds size of device (%llu blocks)",
3790 ext4_blocks_count(es
), blocks_count
);
3795 * It makes no sense for the first data block to be beyond the end
3796 * of the filesystem.
3798 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
3799 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data "
3800 "block %u is beyond end of filesystem (%llu)",
3801 le32_to_cpu(es
->s_first_data_block
),
3802 ext4_blocks_count(es
));
3805 blocks_count
= (ext4_blocks_count(es
) -
3806 le32_to_cpu(es
->s_first_data_block
) +
3807 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
3808 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
3809 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
3810 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
3811 "(block count %llu, first data block %u, "
3812 "blocks per group %lu)", sbi
->s_groups_count
,
3813 ext4_blocks_count(es
),
3814 le32_to_cpu(es
->s_first_data_block
),
3815 EXT4_BLOCKS_PER_GROUP(sb
));
3818 sbi
->s_groups_count
= blocks_count
;
3819 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
3820 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
3821 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
3822 EXT4_DESC_PER_BLOCK(sb
);
3823 sbi
->s_group_desc
= ext4_kvmalloc(db_count
*
3824 sizeof(struct buffer_head
*),
3826 if (sbi
->s_group_desc
== NULL
) {
3827 ext4_msg(sb
, KERN_ERR
, "not enough memory");
3833 sbi
->s_proc
= proc_mkdir(sb
->s_id
, ext4_proc_root
);
3836 proc_create_data("options", S_IRUGO
, sbi
->s_proc
,
3837 &ext4_seq_options_fops
, sb
);
3839 bgl_lock_init(sbi
->s_blockgroup_lock
);
3841 for (i
= 0; i
< db_count
; i
++) {
3842 block
= descriptor_loc(sb
, logical_sb_block
, i
);
3843 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
3844 if (!sbi
->s_group_desc
[i
]) {
3845 ext4_msg(sb
, KERN_ERR
,
3846 "can't read group descriptor %d", i
);
3851 if (!ext4_check_descriptors(sb
, &first_not_zeroed
)) {
3852 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
3855 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
3856 if (!ext4_fill_flex_info(sb
)) {
3857 ext4_msg(sb
, KERN_ERR
,
3858 "unable to initialize "
3859 "flex_bg meta info!");
3863 sbi
->s_gdb_count
= db_count
;
3864 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
3865 spin_lock_init(&sbi
->s_next_gen_lock
);
3867 init_timer(&sbi
->s_err_report
);
3868 sbi
->s_err_report
.function
= print_daily_error_info
;
3869 sbi
->s_err_report
.data
= (unsigned long) sb
;
3871 /* Register extent status tree shrinker */
3872 ext4_es_register_shrinker(sbi
);
3874 err
= percpu_counter_init(&sbi
->s_freeclusters_counter
,
3875 ext4_count_free_clusters(sb
));
3877 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
3878 ext4_count_free_inodes(sb
));
3881 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
3882 ext4_count_dirs(sb
));
3885 err
= percpu_counter_init(&sbi
->s_dirtyclusters_counter
, 0);
3888 err
= percpu_counter_init(&sbi
->s_extent_cache_cnt
, 0);
3891 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
3895 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
3896 sbi
->s_extent_max_zeroout_kb
= 32;
3899 * set up enough so that it can read an inode
3901 if (!test_opt(sb
, NOLOAD
) &&
3902 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
3903 sb
->s_op
= &ext4_sops
;
3905 sb
->s_op
= &ext4_nojournal_sops
;
3906 sb
->s_export_op
= &ext4_export_ops
;
3907 sb
->s_xattr
= ext4_xattr_handlers
;
3909 sb
->dq_op
= &ext4_quota_operations
;
3910 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
))
3911 sb
->s_qcop
= &ext4_qctl_sysfile_operations
;
3913 sb
->s_qcop
= &ext4_qctl_operations
;
3915 memcpy(sb
->s_uuid
, es
->s_uuid
, sizeof(es
->s_uuid
));
3917 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
3918 mutex_init(&sbi
->s_orphan_lock
);
3922 needs_recovery
= (es
->s_last_orphan
!= 0 ||
3923 EXT4_HAS_INCOMPAT_FEATURE(sb
,
3924 EXT4_FEATURE_INCOMPAT_RECOVER
));
3926 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_MMP
) &&
3927 !(sb
->s_flags
& MS_RDONLY
))
3928 if (ext4_multi_mount_protect(sb
, le64_to_cpu(es
->s_mmp_block
)))
3932 * The first inode we look at is the journal inode. Don't try
3933 * root first: it may be modified in the journal!
3935 if (!test_opt(sb
, NOLOAD
) &&
3936 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
3937 if (ext4_load_journal(sb
, es
, journal_devnum
))
3939 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
3940 EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3941 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
3942 "suppressed and not mounted read-only");
3943 goto failed_mount_wq
;
3945 clear_opt(sb
, DATA_FLAGS
);
3946 sbi
->s_journal
= NULL
;
3951 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
) &&
3952 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
3953 JBD2_FEATURE_INCOMPAT_64BIT
)) {
3954 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
3955 goto failed_mount_wq
;
3958 if (!set_journal_csum_feature_set(sb
)) {
3959 ext4_msg(sb
, KERN_ERR
, "Failed to set journal checksum "
3961 goto failed_mount_wq
;
3964 /* We have now updated the journal if required, so we can
3965 * validate the data journaling mode. */
3966 switch (test_opt(sb
, DATA_FLAGS
)) {
3968 /* No mode set, assume a default based on the journal
3969 * capabilities: ORDERED_DATA if the journal can
3970 * cope, else JOURNAL_DATA
3972 if (jbd2_journal_check_available_features
3973 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
3974 set_opt(sb
, ORDERED_DATA
);
3976 set_opt(sb
, JOURNAL_DATA
);
3979 case EXT4_MOUNT_ORDERED_DATA
:
3980 case EXT4_MOUNT_WRITEBACK_DATA
:
3981 if (!jbd2_journal_check_available_features
3982 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
3983 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
3984 "requested data journaling mode");
3985 goto failed_mount_wq
;
3990 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
3992 sbi
->s_journal
->j_commit_callback
= ext4_journal_commit_callback
;
3995 * The journal may have updated the bg summary counts, so we
3996 * need to update the global counters.
3998 percpu_counter_set(&sbi
->s_freeclusters_counter
,
3999 ext4_count_free_clusters(sb
));
4000 percpu_counter_set(&sbi
->s_freeinodes_counter
,
4001 ext4_count_free_inodes(sb
));
4002 percpu_counter_set(&sbi
->s_dirs_counter
,
4003 ext4_count_dirs(sb
));
4004 percpu_counter_set(&sbi
->s_dirtyclusters_counter
, 0);
4008 * Get the # of file system overhead blocks from the
4009 * superblock if present.
4011 if (es
->s_overhead_clusters
)
4012 sbi
->s_overhead
= le32_to_cpu(es
->s_overhead_clusters
);
4014 err
= ext4_calculate_overhead(sb
);
4016 goto failed_mount_wq
;
4020 * The maximum number of concurrent works can be high and
4021 * concurrency isn't really necessary. Limit it to 1.
4023 EXT4_SB(sb
)->rsv_conversion_wq
=
4024 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM
| WQ_UNBOUND
, 1);
4025 if (!EXT4_SB(sb
)->rsv_conversion_wq
) {
4026 printk(KERN_ERR
"EXT4-fs: failed to create workqueue\n");
4032 * The jbd2_journal_load will have done any necessary log recovery,
4033 * so we can safely mount the rest of the filesystem now.
4036 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
4038 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
4039 ret
= PTR_ERR(root
);
4043 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
4044 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
4048 sb
->s_root
= d_make_root(root
);
4050 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
4055 if (ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
))
4056 sb
->s_flags
|= MS_RDONLY
;
4058 /* determine the minimum size of new large inodes, if present */
4059 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
4060 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
4061 EXT4_GOOD_OLD_INODE_SIZE
;
4062 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
4063 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
4064 if (sbi
->s_want_extra_isize
<
4065 le16_to_cpu(es
->s_want_extra_isize
))
4066 sbi
->s_want_extra_isize
=
4067 le16_to_cpu(es
->s_want_extra_isize
);
4068 if (sbi
->s_want_extra_isize
<
4069 le16_to_cpu(es
->s_min_extra_isize
))
4070 sbi
->s_want_extra_isize
=
4071 le16_to_cpu(es
->s_min_extra_isize
);
4074 /* Check if enough inode space is available */
4075 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
4076 sbi
->s_inode_size
) {
4077 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
4078 EXT4_GOOD_OLD_INODE_SIZE
;
4079 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
4083 err
= ext4_reserve_clusters(sbi
, ext4_calculate_resv_clusters(sb
));
4085 ext4_msg(sb
, KERN_ERR
, "failed to reserve %llu clusters for "
4086 "reserved pool", ext4_calculate_resv_clusters(sb
));
4087 goto failed_mount4a
;
4090 err
= ext4_setup_system_zone(sb
);
4092 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
4094 goto failed_mount4a
;
4098 err
= ext4_mb_init(sb
);
4100 ext4_msg(sb
, KERN_ERR
, "failed to initialize mballoc (%d)",
4105 err
= ext4_register_li_request(sb
, first_not_zeroed
);
4109 sbi
->s_kobj
.kset
= ext4_kset
;
4110 init_completion(&sbi
->s_kobj_unregister
);
4111 err
= kobject_init_and_add(&sbi
->s_kobj
, &ext4_ktype
, NULL
,
4117 /* Enable quota usage during mount. */
4118 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
) &&
4119 !(sb
->s_flags
& MS_RDONLY
)) {
4120 err
= ext4_enable_quotas(sb
);
4124 #endif /* CONFIG_QUOTA */
4126 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
4127 ext4_orphan_cleanup(sb
, es
);
4128 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
4129 if (needs_recovery
) {
4130 ext4_msg(sb
, KERN_INFO
, "recovery complete");
4131 ext4_mark_recovery_complete(sb
, es
);
4133 if (EXT4_SB(sb
)->s_journal
) {
4134 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
4135 descr
= " journalled data mode";
4136 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
4137 descr
= " ordered data mode";
4139 descr
= " writeback data mode";
4141 descr
= "out journal";
4143 if (test_opt(sb
, DISCARD
)) {
4144 struct request_queue
*q
= bdev_get_queue(sb
->s_bdev
);
4145 if (!blk_queue_discard(q
))
4146 ext4_msg(sb
, KERN_WARNING
,
4147 "mounting with \"discard\" option, but "
4148 "the device does not support discard");
4151 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s. "
4152 "Opts: %s%s%s", descr
, sbi
->s_es
->s_mount_opts
,
4153 *sbi
->s_es
->s_mount_opts
? "; " : "", orig_data
);
4155 if (es
->s_error_count
)
4156 mod_timer(&sbi
->s_err_report
, jiffies
+ 300*HZ
); /* 5 minutes */
4158 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4159 ratelimit_state_init(&sbi
->s_err_ratelimit_state
, 5 * HZ
, 10);
4160 ratelimit_state_init(&sbi
->s_warning_ratelimit_state
, 5 * HZ
, 10);
4161 ratelimit_state_init(&sbi
->s_msg_ratelimit_state
, 5 * HZ
, 10);
4168 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
4173 kobject_del(&sbi
->s_kobj
);
4176 ext4_unregister_li_request(sb
);
4178 ext4_mb_release(sb
);
4180 ext4_ext_release(sb
);
4181 ext4_release_system_zone(sb
);
4186 ext4_msg(sb
, KERN_ERR
, "mount failed");
4187 if (EXT4_SB(sb
)->rsv_conversion_wq
)
4188 destroy_workqueue(EXT4_SB(sb
)->rsv_conversion_wq
);
4190 if (sbi
->s_journal
) {
4191 jbd2_journal_destroy(sbi
->s_journal
);
4192 sbi
->s_journal
= NULL
;
4195 ext4_es_unregister_shrinker(sbi
);
4196 del_timer_sync(&sbi
->s_err_report
);
4197 if (sbi
->s_flex_groups
)
4198 ext4_kvfree(sbi
->s_flex_groups
);
4199 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
4200 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
4201 percpu_counter_destroy(&sbi
->s_dirs_counter
);
4202 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
4203 percpu_counter_destroy(&sbi
->s_extent_cache_cnt
);
4205 kthread_stop(sbi
->s_mmp_tsk
);
4207 for (i
= 0; i
< db_count
; i
++)
4208 brelse(sbi
->s_group_desc
[i
]);
4209 ext4_kvfree(sbi
->s_group_desc
);
4211 if (sbi
->s_chksum_driver
)
4212 crypto_free_shash(sbi
->s_chksum_driver
);
4214 remove_proc_entry("options", sbi
->s_proc
);
4215 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
4218 for (i
= 0; i
< MAXQUOTAS
; i
++)
4219 kfree(sbi
->s_qf_names
[i
]);
4221 ext4_blkdev_remove(sbi
);
4224 sb
->s_fs_info
= NULL
;
4225 kfree(sbi
->s_blockgroup_lock
);
4229 return err
? err
: ret
;
4233 * Setup any per-fs journal parameters now. We'll do this both on
4234 * initial mount, once the journal has been initialised but before we've
4235 * done any recovery; and again on any subsequent remount.
4237 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
4239 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4241 journal
->j_commit_interval
= sbi
->s_commit_interval
;
4242 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
4243 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
4245 write_lock(&journal
->j_state_lock
);
4246 if (test_opt(sb
, BARRIER
))
4247 journal
->j_flags
|= JBD2_BARRIER
;
4249 journal
->j_flags
&= ~JBD2_BARRIER
;
4250 if (test_opt(sb
, DATA_ERR_ABORT
))
4251 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
4253 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
4254 write_unlock(&journal
->j_state_lock
);
4257 static journal_t
*ext4_get_journal(struct super_block
*sb
,
4258 unsigned int journal_inum
)
4260 struct inode
*journal_inode
;
4263 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4265 /* First, test for the existence of a valid inode on disk. Bad
4266 * things happen if we iget() an unused inode, as the subsequent
4267 * iput() will try to delete it. */
4269 journal_inode
= ext4_iget(sb
, journal_inum
);
4270 if (IS_ERR(journal_inode
)) {
4271 ext4_msg(sb
, KERN_ERR
, "no journal found");
4274 if (!journal_inode
->i_nlink
) {
4275 make_bad_inode(journal_inode
);
4276 iput(journal_inode
);
4277 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
4281 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4282 journal_inode
, journal_inode
->i_size
);
4283 if (!S_ISREG(journal_inode
->i_mode
)) {
4284 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
4285 iput(journal_inode
);
4289 journal
= jbd2_journal_init_inode(journal_inode
);
4291 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
4292 iput(journal_inode
);
4295 journal
->j_private
= sb
;
4296 ext4_init_journal_params(sb
, journal
);
4300 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
4303 struct buffer_head
*bh
;
4307 int hblock
, blocksize
;
4308 ext4_fsblk_t sb_block
;
4309 unsigned long offset
;
4310 struct ext4_super_block
*es
;
4311 struct block_device
*bdev
;
4313 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4315 bdev
= ext4_blkdev_get(j_dev
, sb
);
4319 blocksize
= sb
->s_blocksize
;
4320 hblock
= bdev_logical_block_size(bdev
);
4321 if (blocksize
< hblock
) {
4322 ext4_msg(sb
, KERN_ERR
,
4323 "blocksize too small for journal device");
4327 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
4328 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
4329 set_blocksize(bdev
, blocksize
);
4330 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
4331 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
4332 "external journal");
4336 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
4337 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
4338 !(le32_to_cpu(es
->s_feature_incompat
) &
4339 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
4340 ext4_msg(sb
, KERN_ERR
, "external journal has "
4346 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
4347 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
4352 len
= ext4_blocks_count(es
);
4353 start
= sb_block
+ 1;
4354 brelse(bh
); /* we're done with the superblock */
4356 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
4357 start
, len
, blocksize
);
4359 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
4362 journal
->j_private
= sb
;
4363 ll_rw_block(READ
| REQ_META
| REQ_PRIO
, 1, &journal
->j_sb_buffer
);
4364 wait_on_buffer(journal
->j_sb_buffer
);
4365 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
4366 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
4369 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
4370 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
4371 "user (unsupported) - %d",
4372 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
4375 EXT4_SB(sb
)->journal_bdev
= bdev
;
4376 ext4_init_journal_params(sb
, journal
);
4380 jbd2_journal_destroy(journal
);
4382 ext4_blkdev_put(bdev
);
4386 static int ext4_load_journal(struct super_block
*sb
,
4387 struct ext4_super_block
*es
,
4388 unsigned long journal_devnum
)
4391 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
4394 int really_read_only
;
4396 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4398 if (journal_devnum
&&
4399 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4400 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
4401 "numbers have changed");
4402 journal_dev
= new_decode_dev(journal_devnum
);
4404 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
4406 really_read_only
= bdev_read_only(sb
->s_bdev
);
4409 * Are we loading a blank journal or performing recovery after a
4410 * crash? For recovery, we need to check in advance whether we
4411 * can get read-write access to the device.
4413 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
4414 if (sb
->s_flags
& MS_RDONLY
) {
4415 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
4416 "required on readonly filesystem");
4417 if (really_read_only
) {
4418 ext4_msg(sb
, KERN_ERR
, "write access "
4419 "unavailable, cannot proceed");
4422 ext4_msg(sb
, KERN_INFO
, "write access will "
4423 "be enabled during recovery");
4427 if (journal_inum
&& journal_dev
) {
4428 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
4429 "and inode journals!");
4434 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
4437 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
4441 if (!(journal
->j_flags
& JBD2_BARRIER
))
4442 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
4444 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
4445 err
= jbd2_journal_wipe(journal
, !really_read_only
);
4447 char *save
= kmalloc(EXT4_S_ERR_LEN
, GFP_KERNEL
);
4449 memcpy(save
, ((char *) es
) +
4450 EXT4_S_ERR_START
, EXT4_S_ERR_LEN
);
4451 err
= jbd2_journal_load(journal
);
4453 memcpy(((char *) es
) + EXT4_S_ERR_START
,
4454 save
, EXT4_S_ERR_LEN
);
4459 ext4_msg(sb
, KERN_ERR
, "error loading journal");
4460 jbd2_journal_destroy(journal
);
4464 EXT4_SB(sb
)->s_journal
= journal
;
4465 ext4_clear_journal_err(sb
, es
);
4467 if (!really_read_only
&& journal_devnum
&&
4468 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4469 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
4471 /* Make sure we flush the recovery flag to disk. */
4472 ext4_commit_super(sb
, 1);
4478 static int ext4_commit_super(struct super_block
*sb
, int sync
)
4480 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
4481 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
4484 if (!sbh
|| block_device_ejected(sb
))
4486 if (buffer_write_io_error(sbh
)) {
4488 * Oh, dear. A previous attempt to write the
4489 * superblock failed. This could happen because the
4490 * USB device was yanked out. Or it could happen to
4491 * be a transient write error and maybe the block will
4492 * be remapped. Nothing we can do but to retry the
4493 * write and hope for the best.
4495 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
4496 "superblock detected");
4497 clear_buffer_write_io_error(sbh
);
4498 set_buffer_uptodate(sbh
);
4501 * If the file system is mounted read-only, don't update the
4502 * superblock write time. This avoids updating the superblock
4503 * write time when we are mounting the root file system
4504 * read/only but we need to replay the journal; at that point,
4505 * for people who are east of GMT and who make their clock
4506 * tick in localtime for Windows bug-for-bug compatibility,
4507 * the clock is set in the future, and this will cause e2fsck
4508 * to complain and force a full file system check.
4510 if (!(sb
->s_flags
& MS_RDONLY
))
4511 es
->s_wtime
= cpu_to_le32(get_seconds());
4512 if (sb
->s_bdev
->bd_part
)
4513 es
->s_kbytes_written
=
4514 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
4515 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
4516 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
4518 es
->s_kbytes_written
=
4519 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
);
4520 ext4_free_blocks_count_set(es
,
4521 EXT4_C2B(EXT4_SB(sb
), percpu_counter_sum_positive(
4522 &EXT4_SB(sb
)->s_freeclusters_counter
)));
4523 es
->s_free_inodes_count
=
4524 cpu_to_le32(percpu_counter_sum_positive(
4525 &EXT4_SB(sb
)->s_freeinodes_counter
));
4526 BUFFER_TRACE(sbh
, "marking dirty");
4527 ext4_superblock_csum_set(sb
);
4528 mark_buffer_dirty(sbh
);
4530 error
= sync_dirty_buffer(sbh
);
4534 error
= buffer_write_io_error(sbh
);
4536 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
4538 clear_buffer_write_io_error(sbh
);
4539 set_buffer_uptodate(sbh
);
4546 * Have we just finished recovery? If so, and if we are mounting (or
4547 * remounting) the filesystem readonly, then we will end up with a
4548 * consistent fs on disk. Record that fact.
4550 static void ext4_mark_recovery_complete(struct super_block
*sb
,
4551 struct ext4_super_block
*es
)
4553 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
4555 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
4556 BUG_ON(journal
!= NULL
);
4559 jbd2_journal_lock_updates(journal
);
4560 if (jbd2_journal_flush(journal
) < 0)
4563 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
4564 sb
->s_flags
& MS_RDONLY
) {
4565 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4566 ext4_commit_super(sb
, 1);
4570 jbd2_journal_unlock_updates(journal
);
4574 * If we are mounting (or read-write remounting) a filesystem whose journal
4575 * has recorded an error from a previous lifetime, move that error to the
4576 * main filesystem now.
4578 static void ext4_clear_journal_err(struct super_block
*sb
,
4579 struct ext4_super_block
*es
)
4585 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4587 journal
= EXT4_SB(sb
)->s_journal
;
4590 * Now check for any error status which may have been recorded in the
4591 * journal by a prior ext4_error() or ext4_abort()
4594 j_errno
= jbd2_journal_errno(journal
);
4598 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
4599 ext4_warning(sb
, "Filesystem error recorded "
4600 "from previous mount: %s", errstr
);
4601 ext4_warning(sb
, "Marking fs in need of filesystem check.");
4603 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
4604 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
4605 ext4_commit_super(sb
, 1);
4607 jbd2_journal_clear_err(journal
);
4608 jbd2_journal_update_sb_errno(journal
);
4613 * Force the running and committing transactions to commit,
4614 * and wait on the commit.
4616 int ext4_force_commit(struct super_block
*sb
)
4620 if (sb
->s_flags
& MS_RDONLY
)
4623 journal
= EXT4_SB(sb
)->s_journal
;
4624 return ext4_journal_force_commit(journal
);
4627 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
4631 bool needs_barrier
= false;
4632 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4634 trace_ext4_sync_fs(sb
, wait
);
4635 flush_workqueue(sbi
->rsv_conversion_wq
);
4637 * Writeback quota in non-journalled quota case - journalled quota has
4640 dquot_writeback_dquots(sb
, -1);
4642 * Data writeback is possible w/o journal transaction, so barrier must
4643 * being sent at the end of the function. But we can skip it if
4644 * transaction_commit will do it for us.
4646 target
= jbd2_get_latest_transaction(sbi
->s_journal
);
4647 if (wait
&& sbi
->s_journal
->j_flags
& JBD2_BARRIER
&&
4648 !jbd2_trans_will_send_data_barrier(sbi
->s_journal
, target
))
4649 needs_barrier
= true;
4651 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
4653 ret
= jbd2_log_wait_commit(sbi
->s_journal
, target
);
4655 if (needs_barrier
) {
4657 err
= blkdev_issue_flush(sb
->s_bdev
, GFP_KERNEL
, NULL
);
4665 static int ext4_sync_fs_nojournal(struct super_block
*sb
, int wait
)
4669 trace_ext4_sync_fs(sb
, wait
);
4670 flush_workqueue(EXT4_SB(sb
)->rsv_conversion_wq
);
4671 dquot_writeback_dquots(sb
, -1);
4672 if (wait
&& test_opt(sb
, BARRIER
))
4673 ret
= blkdev_issue_flush(sb
->s_bdev
, GFP_KERNEL
, NULL
);
4679 * LVM calls this function before a (read-only) snapshot is created. This
4680 * gives us a chance to flush the journal completely and mark the fs clean.
4682 * Note that only this function cannot bring a filesystem to be in a clean
4683 * state independently. It relies on upper layer to stop all data & metadata
4686 static int ext4_freeze(struct super_block
*sb
)
4691 if (sb
->s_flags
& MS_RDONLY
)
4694 journal
= EXT4_SB(sb
)->s_journal
;
4696 /* Now we set up the journal barrier. */
4697 jbd2_journal_lock_updates(journal
);
4700 * Don't clear the needs_recovery flag if we failed to flush
4703 error
= jbd2_journal_flush(journal
);
4707 /* Journal blocked and flushed, clear needs_recovery flag. */
4708 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4709 error
= ext4_commit_super(sb
, 1);
4711 /* we rely on upper layer to stop further updates */
4712 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
4717 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4718 * flag here, even though the filesystem is not technically dirty yet.
4720 static int ext4_unfreeze(struct super_block
*sb
)
4722 if (sb
->s_flags
& MS_RDONLY
)
4725 /* Reset the needs_recovery flag before the fs is unlocked. */
4726 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4727 ext4_commit_super(sb
, 1);
4732 * Structure to save mount options for ext4_remount's benefit
4734 struct ext4_mount_options
{
4735 unsigned long s_mount_opt
;
4736 unsigned long s_mount_opt2
;
4739 unsigned long s_commit_interval
;
4740 u32 s_min_batch_time
, s_max_batch_time
;
4743 char *s_qf_names
[MAXQUOTAS
];
4747 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
4749 struct ext4_super_block
*es
;
4750 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4751 unsigned long old_sb_flags
;
4752 struct ext4_mount_options old_opts
;
4753 int enable_quota
= 0;
4755 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
4760 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
4762 /* Store the original options */
4763 old_sb_flags
= sb
->s_flags
;
4764 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
4765 old_opts
.s_mount_opt2
= sbi
->s_mount_opt2
;
4766 old_opts
.s_resuid
= sbi
->s_resuid
;
4767 old_opts
.s_resgid
= sbi
->s_resgid
;
4768 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
4769 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
4770 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
4772 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
4773 for (i
= 0; i
< MAXQUOTAS
; i
++)
4774 if (sbi
->s_qf_names
[i
]) {
4775 old_opts
.s_qf_names
[i
] = kstrdup(sbi
->s_qf_names
[i
],
4777 if (!old_opts
.s_qf_names
[i
]) {
4778 for (j
= 0; j
< i
; j
++)
4779 kfree(old_opts
.s_qf_names
[j
]);
4784 old_opts
.s_qf_names
[i
] = NULL
;
4786 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
4787 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
4790 * Allow the "check" option to be passed as a remount option.
4792 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
, 1)) {
4797 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
4798 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
4799 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4800 "both data=journal and delalloc");
4804 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
4805 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4806 "both data=journal and dioread_nolock");
4812 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
4813 ext4_abort(sb
, "Abort forced by user");
4815 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
4816 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
4820 if (sbi
->s_journal
) {
4821 ext4_init_journal_params(sb
, sbi
->s_journal
);
4822 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
4825 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
)) {
4826 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
4831 if (*flags
& MS_RDONLY
) {
4832 err
= dquot_suspend(sb
, -1);
4837 * First of all, the unconditional stuff we have to do
4838 * to disable replay of the journal when we next remount
4840 sb
->s_flags
|= MS_RDONLY
;
4843 * OK, test if we are remounting a valid rw partition
4844 * readonly, and if so set the rdonly flag and then
4845 * mark the partition as valid again.
4847 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
4848 (sbi
->s_mount_state
& EXT4_VALID_FS
))
4849 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
4852 ext4_mark_recovery_complete(sb
, es
);
4854 /* Make sure we can mount this feature set readwrite */
4855 if (!ext4_feature_set_ok(sb
, 0)) {
4860 * Make sure the group descriptor checksums
4861 * are sane. If they aren't, refuse to remount r/w.
4863 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
4864 struct ext4_group_desc
*gdp
=
4865 ext4_get_group_desc(sb
, g
, NULL
);
4867 if (!ext4_group_desc_csum_verify(sb
, g
, gdp
)) {
4868 ext4_msg(sb
, KERN_ERR
,
4869 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4870 g
, le16_to_cpu(ext4_group_desc_csum(sbi
, g
, gdp
)),
4871 le16_to_cpu(gdp
->bg_checksum
));
4878 * If we have an unprocessed orphan list hanging
4879 * around from a previously readonly bdev mount,
4880 * require a full umount/remount for now.
4882 if (es
->s_last_orphan
) {
4883 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
4884 "remount RDWR because of unprocessed "
4885 "orphan inode list. Please "
4886 "umount/remount instead");
4892 * Mounting a RDONLY partition read-write, so reread
4893 * and store the current valid flag. (It may have
4894 * been changed by e2fsck since we originally mounted
4898 ext4_clear_journal_err(sb
, es
);
4899 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
4900 if (!ext4_setup_super(sb
, es
, 0))
4901 sb
->s_flags
&= ~MS_RDONLY
;
4902 if (EXT4_HAS_INCOMPAT_FEATURE(sb
,
4903 EXT4_FEATURE_INCOMPAT_MMP
))
4904 if (ext4_multi_mount_protect(sb
,
4905 le64_to_cpu(es
->s_mmp_block
))) {
4914 * Reinitialize lazy itable initialization thread based on
4917 if ((sb
->s_flags
& MS_RDONLY
) || !test_opt(sb
, INIT_INODE_TABLE
))
4918 ext4_unregister_li_request(sb
);
4920 ext4_group_t first_not_zeroed
;
4921 first_not_zeroed
= ext4_has_uninit_itable(sb
);
4922 ext4_register_li_request(sb
, first_not_zeroed
);
4925 ext4_setup_system_zone(sb
);
4926 if (sbi
->s_journal
== NULL
&& !(old_sb_flags
& MS_RDONLY
))
4927 ext4_commit_super(sb
, 1);
4930 /* Release old quota file names */
4931 for (i
= 0; i
< MAXQUOTAS
; i
++)
4932 kfree(old_opts
.s_qf_names
[i
]);
4934 if (sb_any_quota_suspended(sb
))
4935 dquot_resume(sb
, -1);
4936 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
4937 EXT4_FEATURE_RO_COMPAT_QUOTA
)) {
4938 err
= ext4_enable_quotas(sb
);
4945 ext4_msg(sb
, KERN_INFO
, "re-mounted. Opts: %s", orig_data
);
4950 sb
->s_flags
= old_sb_flags
;
4951 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
4952 sbi
->s_mount_opt2
= old_opts
.s_mount_opt2
;
4953 sbi
->s_resuid
= old_opts
.s_resuid
;
4954 sbi
->s_resgid
= old_opts
.s_resgid
;
4955 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
4956 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
4957 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
4959 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
4960 for (i
= 0; i
< MAXQUOTAS
; i
++) {
4961 kfree(sbi
->s_qf_names
[i
]);
4962 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
4969 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
4971 struct super_block
*sb
= dentry
->d_sb
;
4972 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4973 struct ext4_super_block
*es
= sbi
->s_es
;
4974 ext4_fsblk_t overhead
= 0, resv_blocks
;
4977 resv_blocks
= EXT4_C2B(sbi
, atomic64_read(&sbi
->s_resv_clusters
));
4979 if (!test_opt(sb
, MINIX_DF
))
4980 overhead
= sbi
->s_overhead
;
4982 buf
->f_type
= EXT4_SUPER_MAGIC
;
4983 buf
->f_bsize
= sb
->s_blocksize
;
4984 buf
->f_blocks
= ext4_blocks_count(es
) - EXT4_C2B(sbi
, overhead
);
4985 bfree
= percpu_counter_sum_positive(&sbi
->s_freeclusters_counter
) -
4986 percpu_counter_sum_positive(&sbi
->s_dirtyclusters_counter
);
4987 /* prevent underflow in case that few free space is available */
4988 buf
->f_bfree
= EXT4_C2B(sbi
, max_t(s64
, bfree
, 0));
4989 buf
->f_bavail
= buf
->f_bfree
-
4990 (ext4_r_blocks_count(es
) + resv_blocks
);
4991 if (buf
->f_bfree
< (ext4_r_blocks_count(es
) + resv_blocks
))
4993 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
4994 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
4995 buf
->f_namelen
= EXT4_NAME_LEN
;
4996 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
4997 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
4998 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
4999 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
5004 /* Helper function for writing quotas on sync - we need to start transaction
5005 * before quota file is locked for write. Otherwise the are possible deadlocks:
5006 * Process 1 Process 2
5007 * ext4_create() quota_sync()
5008 * jbd2_journal_start() write_dquot()
5009 * dquot_initialize() down(dqio_mutex)
5010 * down(dqio_mutex) jbd2_journal_start()
5016 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
5018 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_id
.type
];
5021 static int ext4_write_dquot(struct dquot
*dquot
)
5025 struct inode
*inode
;
5027 inode
= dquot_to_inode(dquot
);
5028 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
,
5029 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
5031 return PTR_ERR(handle
);
5032 ret
= dquot_commit(dquot
);
5033 err
= ext4_journal_stop(handle
);
5039 static int ext4_acquire_dquot(struct dquot
*dquot
)
5044 handle
= ext4_journal_start(dquot_to_inode(dquot
), EXT4_HT_QUOTA
,
5045 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
5047 return PTR_ERR(handle
);
5048 ret
= dquot_acquire(dquot
);
5049 err
= ext4_journal_stop(handle
);
5055 static int ext4_release_dquot(struct dquot
*dquot
)
5060 handle
= ext4_journal_start(dquot_to_inode(dquot
), EXT4_HT_QUOTA
,
5061 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
5062 if (IS_ERR(handle
)) {
5063 /* Release dquot anyway to avoid endless cycle in dqput() */
5064 dquot_release(dquot
);
5065 return PTR_ERR(handle
);
5067 ret
= dquot_release(dquot
);
5068 err
= ext4_journal_stop(handle
);
5074 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
5076 struct super_block
*sb
= dquot
->dq_sb
;
5077 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
5079 /* Are we journaling quotas? */
5080 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
) ||
5081 sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
5082 dquot_mark_dquot_dirty(dquot
);
5083 return ext4_write_dquot(dquot
);
5085 return dquot_mark_dquot_dirty(dquot
);
5089 static int ext4_write_info(struct super_block
*sb
, int type
)
5094 /* Data block + inode block */
5095 handle
= ext4_journal_start(sb
->s_root
->d_inode
, EXT4_HT_QUOTA
, 2);
5097 return PTR_ERR(handle
);
5098 ret
= dquot_commit_info(sb
, type
);
5099 err
= ext4_journal_stop(handle
);
5106 * Turn on quotas during mount time - we need to find
5107 * the quota file and such...
5109 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
5111 return dquot_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
5112 EXT4_SB(sb
)->s_jquota_fmt
, type
);
5116 * Standard function to be called on quota_on
5118 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
5123 if (!test_opt(sb
, QUOTA
))
5126 /* Quotafile not on the same filesystem? */
5127 if (path
->dentry
->d_sb
!= sb
)
5129 /* Journaling quota? */
5130 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
5131 /* Quotafile not in fs root? */
5132 if (path
->dentry
->d_parent
!= sb
->s_root
)
5133 ext4_msg(sb
, KERN_WARNING
,
5134 "Quota file not on filesystem root. "
5135 "Journaled quota will not work");
5139 * When we journal data on quota file, we have to flush journal to see
5140 * all updates to the file when we bypass pagecache...
5142 if (EXT4_SB(sb
)->s_journal
&&
5143 ext4_should_journal_data(path
->dentry
->d_inode
)) {
5145 * We don't need to lock updates but journal_flush() could
5146 * otherwise be livelocked...
5148 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
5149 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
5150 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
5155 return dquot_quota_on(sb
, type
, format_id
, path
);
5158 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
5162 struct inode
*qf_inode
;
5163 unsigned long qf_inums
[MAXQUOTAS
] = {
5164 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
5165 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
)
5168 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
));
5170 if (!qf_inums
[type
])
5173 qf_inode
= ext4_iget(sb
, qf_inums
[type
]);
5174 if (IS_ERR(qf_inode
)) {
5175 ext4_error(sb
, "Bad quota inode # %lu", qf_inums
[type
]);
5176 return PTR_ERR(qf_inode
);
5179 /* Don't account quota for quota files to avoid recursion */
5180 qf_inode
->i_flags
|= S_NOQUOTA
;
5181 err
= dquot_enable(qf_inode
, type
, format_id
, flags
);
5187 /* Enable usage tracking for all quota types. */
5188 static int ext4_enable_quotas(struct super_block
*sb
)
5191 unsigned long qf_inums
[MAXQUOTAS
] = {
5192 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
5193 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
)
5196 sb_dqopt(sb
)->flags
|= DQUOT_QUOTA_SYS_FILE
;
5197 for (type
= 0; type
< MAXQUOTAS
; type
++) {
5198 if (qf_inums
[type
]) {
5199 err
= ext4_quota_enable(sb
, type
, QFMT_VFS_V1
,
5200 DQUOT_USAGE_ENABLED
);
5203 "Failed to enable quota tracking "
5204 "(type=%d, err=%d). Please run "
5205 "e2fsck to fix.", type
, err
);
5214 * quota_on function that is used when QUOTA feature is set.
5216 static int ext4_quota_on_sysfile(struct super_block
*sb
, int type
,
5219 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
))
5223 * USAGE was enabled at mount time. Only need to enable LIMITS now.
5225 return ext4_quota_enable(sb
, type
, format_id
, DQUOT_LIMITS_ENABLED
);
5228 static int ext4_quota_off(struct super_block
*sb
, int type
)
5230 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5233 /* Force all delayed allocation blocks to be allocated.
5234 * Caller already holds s_umount sem */
5235 if (test_opt(sb
, DELALLOC
))
5236 sync_filesystem(sb
);
5241 /* Update modification times of quota files when userspace can
5242 * start looking at them */
5243 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
, 1);
5246 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
5247 ext4_mark_inode_dirty(handle
, inode
);
5248 ext4_journal_stop(handle
);
5251 return dquot_quota_off(sb
, type
);
5255 * quota_off function that is used when QUOTA feature is set.
5257 static int ext4_quota_off_sysfile(struct super_block
*sb
, int type
)
5259 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
))
5262 /* Disable only the limits. */
5263 return dquot_disable(sb
, type
, DQUOT_LIMITS_ENABLED
);
5266 /* Read data from quotafile - avoid pagecache and such because we cannot afford
5267 * acquiring the locks... As quota files are never truncated and quota code
5268 * itself serializes the operations (and no one else should touch the files)
5269 * we don't have to be afraid of races */
5270 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
5271 size_t len
, loff_t off
)
5273 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5274 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5276 int offset
= off
& (sb
->s_blocksize
- 1);
5279 struct buffer_head
*bh
;
5280 loff_t i_size
= i_size_read(inode
);
5284 if (off
+len
> i_size
)
5287 while (toread
> 0) {
5288 tocopy
= sb
->s_blocksize
- offset
< toread
?
5289 sb
->s_blocksize
- offset
: toread
;
5290 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
5293 if (!bh
) /* A hole? */
5294 memset(data
, 0, tocopy
);
5296 memcpy(data
, bh
->b_data
+offset
, tocopy
);
5306 /* Write to quotafile (we know the transaction is already started and has
5307 * enough credits) */
5308 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
5309 const char *data
, size_t len
, loff_t off
)
5311 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5312 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5314 int offset
= off
& (sb
->s_blocksize
- 1);
5315 struct buffer_head
*bh
;
5316 handle_t
*handle
= journal_current_handle();
5318 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
5319 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5320 " cancelled because transaction is not started",
5321 (unsigned long long)off
, (unsigned long long)len
);
5325 * Since we account only one data block in transaction credits,
5326 * then it is impossible to cross a block boundary.
5328 if (sb
->s_blocksize
- offset
< len
) {
5329 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5330 " cancelled because not block aligned",
5331 (unsigned long long)off
, (unsigned long long)len
);
5335 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
5338 err
= ext4_journal_get_write_access(handle
, bh
);
5344 memcpy(bh
->b_data
+offset
, data
, len
);
5345 flush_dcache_page(bh
->b_page
);
5347 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
5352 if (inode
->i_size
< off
+ len
) {
5353 i_size_write(inode
, off
+ len
);
5354 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
5355 ext4_mark_inode_dirty(handle
, inode
);
5362 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
5363 const char *dev_name
, void *data
)
5365 return mount_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
);
5368 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5369 static inline void register_as_ext2(void)
5371 int err
= register_filesystem(&ext2_fs_type
);
5374 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
5377 static inline void unregister_as_ext2(void)
5379 unregister_filesystem(&ext2_fs_type
);
5382 static inline int ext2_feature_set_ok(struct super_block
*sb
)
5384 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT2_FEATURE_INCOMPAT_SUPP
))
5386 if (sb
->s_flags
& MS_RDONLY
)
5388 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT2_FEATURE_RO_COMPAT_SUPP
))
5393 static inline void register_as_ext2(void) { }
5394 static inline void unregister_as_ext2(void) { }
5395 static inline int ext2_feature_set_ok(struct super_block
*sb
) { return 0; }
5398 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5399 static inline void register_as_ext3(void)
5401 int err
= register_filesystem(&ext3_fs_type
);
5404 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
5407 static inline void unregister_as_ext3(void)
5409 unregister_filesystem(&ext3_fs_type
);
5412 static inline int ext3_feature_set_ok(struct super_block
*sb
)
5414 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT3_FEATURE_INCOMPAT_SUPP
))
5416 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
5418 if (sb
->s_flags
& MS_RDONLY
)
5420 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT3_FEATURE_RO_COMPAT_SUPP
))
5425 static inline void register_as_ext3(void) { }
5426 static inline void unregister_as_ext3(void) { }
5427 static inline int ext3_feature_set_ok(struct super_block
*sb
) { return 0; }
5430 static struct file_system_type ext4_fs_type
= {
5431 .owner
= THIS_MODULE
,
5433 .mount
= ext4_mount
,
5434 .kill_sb
= kill_block_super
,
5435 .fs_flags
= FS_REQUIRES_DEV
,
5437 MODULE_ALIAS_FS("ext4");
5439 static int __init
ext4_init_feat_adverts(void)
5441 struct ext4_features
*ef
;
5444 ef
= kzalloc(sizeof(struct ext4_features
), GFP_KERNEL
);
5448 ef
->f_kobj
.kset
= ext4_kset
;
5449 init_completion(&ef
->f_kobj_unregister
);
5450 ret
= kobject_init_and_add(&ef
->f_kobj
, &ext4_feat_ktype
, NULL
,
5463 static void ext4_exit_feat_adverts(void)
5465 kobject_put(&ext4_feat
->f_kobj
);
5466 wait_for_completion(&ext4_feat
->f_kobj_unregister
);
5470 /* Shared across all ext4 file systems */
5471 wait_queue_head_t ext4__ioend_wq
[EXT4_WQ_HASH_SZ
];
5472 struct mutex ext4__aio_mutex
[EXT4_WQ_HASH_SZ
];
5474 static int __init
ext4_init_fs(void)
5478 ext4_li_info
= NULL
;
5479 mutex_init(&ext4_li_mtx
);
5481 /* Build-time check for flags consistency */
5482 ext4_check_flag_values();
5484 for (i
= 0; i
< EXT4_WQ_HASH_SZ
; i
++) {
5485 mutex_init(&ext4__aio_mutex
[i
]);
5486 init_waitqueue_head(&ext4__ioend_wq
[i
]);
5489 err
= ext4_init_es();
5493 err
= ext4_init_pageio();
5497 err
= ext4_init_system_zone();
5500 ext4_kset
= kset_create_and_add("ext4", NULL
, fs_kobj
);
5505 ext4_proc_root
= proc_mkdir("fs/ext4", NULL
);
5507 err
= ext4_init_feat_adverts();
5511 err
= ext4_init_mballoc();
5515 err
= ext4_init_xattr();
5518 err
= init_inodecache();
5523 err
= register_filesystem(&ext4_fs_type
);
5529 unregister_as_ext2();
5530 unregister_as_ext3();
5531 destroy_inodecache();
5535 ext4_exit_mballoc();
5537 ext4_exit_feat_adverts();
5540 remove_proc_entry("fs/ext4", NULL
);
5541 kset_unregister(ext4_kset
);
5543 ext4_exit_system_zone();
5552 static void __exit
ext4_exit_fs(void)
5554 ext4_destroy_lazyinit_thread();
5555 unregister_as_ext2();
5556 unregister_as_ext3();
5557 unregister_filesystem(&ext4_fs_type
);
5558 destroy_inodecache();
5560 ext4_exit_mballoc();
5561 ext4_exit_feat_adverts();
5562 remove_proc_entry("fs/ext4", NULL
);
5563 kset_unregister(ext4_kset
);
5564 ext4_exit_system_zone();
5569 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5570 MODULE_DESCRIPTION("Fourth Extended Filesystem");
5571 MODULE_LICENSE("GPL");
5572 module_init(ext4_init_fs
)
5573 module_exit(ext4_exit_fs
)