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
);
167 ret
= __vmalloc(size
, flags
, PAGE_KERNEL
);
171 void *ext4_kvzalloc(size_t size
, gfp_t flags
)
175 ret
= kzalloc(size
, flags
);
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 void __ext4_error(struct super_block
*sb
, const char *function
,
415 unsigned int line
, const char *fmt
, ...)
417 struct va_format vaf
;
423 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
424 sb
->s_id
, function
, line
, current
->comm
, &vaf
);
426 save_error_info(sb
, function
, line
);
428 ext4_handle_error(sb
);
431 void __ext4_error_inode(struct inode
*inode
, const char *function
,
432 unsigned int line
, ext4_fsblk_t block
,
433 const char *fmt
, ...)
436 struct va_format vaf
;
437 struct ext4_super_block
*es
= EXT4_SB(inode
->i_sb
)->s_es
;
439 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
440 es
->s_last_error_block
= cpu_to_le64(block
);
441 save_error_info(inode
->i_sb
, function
, line
);
446 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
447 "inode #%lu: block %llu: comm %s: %pV\n",
448 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
449 block
, current
->comm
, &vaf
);
451 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
452 "inode #%lu: comm %s: %pV\n",
453 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
454 current
->comm
, &vaf
);
457 ext4_handle_error(inode
->i_sb
);
460 void __ext4_error_file(struct file
*file
, const char *function
,
461 unsigned int line
, ext4_fsblk_t block
,
462 const char *fmt
, ...)
465 struct va_format vaf
;
466 struct ext4_super_block
*es
;
467 struct inode
*inode
= file_inode(file
);
468 char pathname
[80], *path
;
470 es
= EXT4_SB(inode
->i_sb
)->s_es
;
471 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
472 save_error_info(inode
->i_sb
, function
, line
);
473 path
= d_path(&(file
->f_path
), pathname
, sizeof(pathname
));
481 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
482 "block %llu: comm %s: path %s: %pV\n",
483 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
484 block
, current
->comm
, path
, &vaf
);
487 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
488 "comm %s: path %s: %pV\n",
489 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
490 current
->comm
, path
, &vaf
);
493 ext4_handle_error(inode
->i_sb
);
496 const char *ext4_decode_error(struct super_block
*sb
, int errno
,
503 errstr
= "IO failure";
506 errstr
= "Out of memory";
509 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
510 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
511 errstr
= "Journal has aborted";
513 errstr
= "Readonly filesystem";
516 /* If the caller passed in an extra buffer for unknown
517 * errors, textualise them now. Else we just return
520 /* Check for truncated error codes... */
521 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
530 /* __ext4_std_error decodes expected errors from journaling functions
531 * automatically and invokes the appropriate error response. */
533 void __ext4_std_error(struct super_block
*sb
, const char *function
,
534 unsigned int line
, int errno
)
539 /* Special case: if the error is EROFS, and we're not already
540 * inside a transaction, then there's really no point in logging
542 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
543 (sb
->s_flags
& MS_RDONLY
))
546 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
547 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s:%d: %s\n",
548 sb
->s_id
, function
, line
, errstr
);
549 save_error_info(sb
, function
, line
);
551 ext4_handle_error(sb
);
555 * ext4_abort is a much stronger failure handler than ext4_error. The
556 * abort function may be used to deal with unrecoverable failures such
557 * as journal IO errors or ENOMEM at a critical moment in log management.
559 * We unconditionally force the filesystem into an ABORT|READONLY state,
560 * unless the error response on the fs has been set to panic in which
561 * case we take the easy way out and panic immediately.
564 void __ext4_abort(struct super_block
*sb
, const char *function
,
565 unsigned int line
, const char *fmt
, ...)
569 save_error_info(sb
, function
, line
);
571 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: ", sb
->s_id
,
577 if ((sb
->s_flags
& MS_RDONLY
) == 0) {
578 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
579 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
581 * Make sure updated value of ->s_mount_flags will be visible
582 * before ->s_flags update
585 sb
->s_flags
|= MS_RDONLY
;
586 if (EXT4_SB(sb
)->s_journal
)
587 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
588 save_error_info(sb
, function
, line
);
590 if (test_opt(sb
, ERRORS_PANIC
))
591 panic("EXT4-fs panic from previous error\n");
594 void __ext4_msg(struct super_block
*sb
,
595 const char *prefix
, const char *fmt
, ...)
597 struct va_format vaf
;
603 printk("%sEXT4-fs (%s): %pV\n", prefix
, sb
->s_id
, &vaf
);
607 void __ext4_warning(struct super_block
*sb
, const char *function
,
608 unsigned int line
, const char *fmt
, ...)
610 struct va_format vaf
;
616 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: %pV\n",
617 sb
->s_id
, function
, line
, &vaf
);
621 void __ext4_grp_locked_error(const char *function
, unsigned int line
,
622 struct super_block
*sb
, ext4_group_t grp
,
623 unsigned long ino
, ext4_fsblk_t block
,
624 const char *fmt
, ...)
628 struct va_format vaf
;
630 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
632 es
->s_last_error_ino
= cpu_to_le32(ino
);
633 es
->s_last_error_block
= cpu_to_le64(block
);
634 __save_error_info(sb
, function
, line
);
640 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: group %u, ",
641 sb
->s_id
, function
, line
, grp
);
643 printk(KERN_CONT
"inode %lu: ", ino
);
645 printk(KERN_CONT
"block %llu:", (unsigned long long) block
);
646 printk(KERN_CONT
"%pV\n", &vaf
);
649 if (test_opt(sb
, ERRORS_CONT
)) {
650 ext4_commit_super(sb
, 0);
654 ext4_unlock_group(sb
, grp
);
655 ext4_handle_error(sb
);
657 * We only get here in the ERRORS_RO case; relocking the group
658 * may be dangerous, but nothing bad will happen since the
659 * filesystem will have already been marked read/only and the
660 * journal has been aborted. We return 1 as a hint to callers
661 * who might what to use the return value from
662 * ext4_grp_locked_error() to distinguish between the
663 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
664 * aggressively from the ext4 function in question, with a
665 * more appropriate error code.
667 ext4_lock_group(sb
, grp
);
671 void ext4_update_dynamic_rev(struct super_block
*sb
)
673 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
675 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
679 "updating to rev %d because of new feature flag, "
680 "running e2fsck is recommended",
683 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
684 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
685 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
686 /* leave es->s_feature_*compat flags alone */
687 /* es->s_uuid will be set by e2fsck if empty */
690 * The rest of the superblock fields should be zero, and if not it
691 * means they are likely already in use, so leave them alone. We
692 * can leave it up to e2fsck to clean up any inconsistencies there.
697 * Open the external journal device
699 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
701 struct block_device
*bdev
;
702 char b
[BDEVNAME_SIZE
];
704 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
, sb
);
710 ext4_msg(sb
, KERN_ERR
, "failed to open journal device %s: %ld",
711 __bdevname(dev
, b
), PTR_ERR(bdev
));
716 * Release the journal device
718 static void ext4_blkdev_put(struct block_device
*bdev
)
720 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
723 static void ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
725 struct block_device
*bdev
;
726 bdev
= sbi
->journal_bdev
;
728 ext4_blkdev_put(bdev
);
729 sbi
->journal_bdev
= NULL
;
733 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
735 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
738 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
742 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
743 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
745 printk(KERN_ERR
"sb_info orphan list:\n");
746 list_for_each(l
, &sbi
->s_orphan
) {
747 struct inode
*inode
= orphan_list_entry(l
);
749 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
750 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
751 inode
->i_mode
, inode
->i_nlink
,
756 static void ext4_put_super(struct super_block
*sb
)
758 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
759 struct ext4_super_block
*es
= sbi
->s_es
;
762 ext4_unregister_li_request(sb
);
763 dquot_disable(sb
, -1, DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
765 flush_workqueue(sbi
->unrsv_conversion_wq
);
766 flush_workqueue(sbi
->rsv_conversion_wq
);
767 destroy_workqueue(sbi
->unrsv_conversion_wq
);
768 destroy_workqueue(sbi
->rsv_conversion_wq
);
770 if (sbi
->s_journal
) {
771 err
= jbd2_journal_destroy(sbi
->s_journal
);
772 sbi
->s_journal
= NULL
;
774 ext4_abort(sb
, "Couldn't clean up the journal");
777 ext4_es_unregister_shrinker(sbi
);
778 del_timer(&sbi
->s_err_report
);
779 ext4_release_system_zone(sb
);
781 ext4_ext_release(sb
);
782 ext4_xattr_put_super(sb
);
784 if (!(sb
->s_flags
& MS_RDONLY
)) {
785 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
786 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
788 if (!(sb
->s_flags
& MS_RDONLY
))
789 ext4_commit_super(sb
, 1);
792 remove_proc_entry("options", sbi
->s_proc
);
793 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
795 kobject_del(&sbi
->s_kobj
);
797 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
798 brelse(sbi
->s_group_desc
[i
]);
799 ext4_kvfree(sbi
->s_group_desc
);
800 ext4_kvfree(sbi
->s_flex_groups
);
801 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
802 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
803 percpu_counter_destroy(&sbi
->s_dirs_counter
);
804 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
805 percpu_counter_destroy(&sbi
->s_extent_cache_cnt
);
808 for (i
= 0; i
< MAXQUOTAS
; i
++)
809 kfree(sbi
->s_qf_names
[i
]);
812 /* Debugging code just in case the in-memory inode orphan list
813 * isn't empty. The on-disk one can be non-empty if we've
814 * detected an error and taken the fs readonly, but the
815 * in-memory list had better be clean by this point. */
816 if (!list_empty(&sbi
->s_orphan
))
817 dump_orphan_list(sb
, sbi
);
818 J_ASSERT(list_empty(&sbi
->s_orphan
));
820 invalidate_bdev(sb
->s_bdev
);
821 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
823 * Invalidate the journal device's buffers. We don't want them
824 * floating about in memory - the physical journal device may
825 * hotswapped, and it breaks the `ro-after' testing code.
827 sync_blockdev(sbi
->journal_bdev
);
828 invalidate_bdev(sbi
->journal_bdev
);
829 ext4_blkdev_remove(sbi
);
832 kthread_stop(sbi
->s_mmp_tsk
);
833 sb
->s_fs_info
= NULL
;
835 * Now that we are completely done shutting down the
836 * superblock, we need to actually destroy the kobject.
838 kobject_put(&sbi
->s_kobj
);
839 wait_for_completion(&sbi
->s_kobj_unregister
);
840 if (sbi
->s_chksum_driver
)
841 crypto_free_shash(sbi
->s_chksum_driver
);
842 kfree(sbi
->s_blockgroup_lock
);
846 static struct kmem_cache
*ext4_inode_cachep
;
849 * Called inside transaction, so use GFP_NOFS
851 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
853 struct ext4_inode_info
*ei
;
855 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
859 ei
->vfs_inode
.i_version
= 1;
860 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
861 spin_lock_init(&ei
->i_prealloc_lock
);
862 ext4_es_init_tree(&ei
->i_es_tree
);
863 rwlock_init(&ei
->i_es_lock
);
864 INIT_LIST_HEAD(&ei
->i_es_lru
);
866 ei
->i_touch_when
= 0;
867 ei
->i_reserved_data_blocks
= 0;
868 ei
->i_reserved_meta_blocks
= 0;
869 ei
->i_allocated_meta_blocks
= 0;
870 ei
->i_da_metadata_calc_len
= 0;
871 ei
->i_da_metadata_calc_last_lblock
= 0;
872 spin_lock_init(&(ei
->i_block_reservation_lock
));
874 ei
->i_reserved_quota
= 0;
877 INIT_LIST_HEAD(&ei
->i_rsv_conversion_list
);
878 INIT_LIST_HEAD(&ei
->i_unrsv_conversion_list
);
879 spin_lock_init(&ei
->i_completed_io_lock
);
881 ei
->i_datasync_tid
= 0;
882 atomic_set(&ei
->i_ioend_count
, 0);
883 atomic_set(&ei
->i_unwritten
, 0);
884 INIT_WORK(&ei
->i_rsv_conversion_work
, ext4_end_io_rsv_work
);
885 INIT_WORK(&ei
->i_unrsv_conversion_work
, ext4_end_io_unrsv_work
);
887 return &ei
->vfs_inode
;
890 static int ext4_drop_inode(struct inode
*inode
)
892 int drop
= generic_drop_inode(inode
);
894 trace_ext4_drop_inode(inode
, drop
);
898 static void ext4_i_callback(struct rcu_head
*head
)
900 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
901 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
904 static void ext4_destroy_inode(struct inode
*inode
)
906 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
907 ext4_msg(inode
->i_sb
, KERN_ERR
,
908 "Inode %lu (%p): orphan list check failed!",
909 inode
->i_ino
, EXT4_I(inode
));
910 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
911 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
915 call_rcu(&inode
->i_rcu
, ext4_i_callback
);
918 static void init_once(void *foo
)
920 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
922 INIT_LIST_HEAD(&ei
->i_orphan
);
923 init_rwsem(&ei
->xattr_sem
);
924 init_rwsem(&ei
->i_data_sem
);
925 inode_init_once(&ei
->vfs_inode
);
928 static int init_inodecache(void)
930 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
931 sizeof(struct ext4_inode_info
),
932 0, (SLAB_RECLAIM_ACCOUNT
|
935 if (ext4_inode_cachep
== NULL
)
940 static void destroy_inodecache(void)
943 * Make sure all delayed rcu free inodes are flushed before we
947 kmem_cache_destroy(ext4_inode_cachep
);
950 void ext4_clear_inode(struct inode
*inode
)
952 invalidate_inode_buffers(inode
);
955 ext4_discard_preallocations(inode
);
956 ext4_es_remove_extent(inode
, 0, EXT_MAX_BLOCKS
);
957 ext4_es_lru_del(inode
);
958 if (EXT4_I(inode
)->jinode
) {
959 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode
),
960 EXT4_I(inode
)->jinode
);
961 jbd2_free_inode(EXT4_I(inode
)->jinode
);
962 EXT4_I(inode
)->jinode
= NULL
;
966 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
967 u64 ino
, u32 generation
)
971 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
972 return ERR_PTR(-ESTALE
);
973 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
974 return ERR_PTR(-ESTALE
);
976 /* iget isn't really right if the inode is currently unallocated!!
978 * ext4_read_inode will return a bad_inode if the inode had been
979 * deleted, so we should be safe.
981 * Currently we don't know the generation for parent directory, so
982 * a generation of 0 means "accept any"
984 inode
= ext4_iget(sb
, ino
);
986 return ERR_CAST(inode
);
987 if (generation
&& inode
->i_generation
!= generation
) {
989 return ERR_PTR(-ESTALE
);
995 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
996 int fh_len
, int fh_type
)
998 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
1002 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
1003 int fh_len
, int fh_type
)
1005 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
1006 ext4_nfs_get_inode
);
1010 * Try to release metadata pages (indirect blocks, directories) which are
1011 * mapped via the block device. Since these pages could have journal heads
1012 * which would prevent try_to_free_buffers() from freeing them, we must use
1013 * jbd2 layer's try_to_free_buffers() function to release them.
1015 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
1018 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
1020 WARN_ON(PageChecked(page
));
1021 if (!page_has_buffers(page
))
1024 return jbd2_journal_try_to_free_buffers(journal
, page
,
1025 wait
& ~__GFP_WAIT
);
1026 return try_to_free_buffers(page
);
1030 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1031 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1033 static int ext4_write_dquot(struct dquot
*dquot
);
1034 static int ext4_acquire_dquot(struct dquot
*dquot
);
1035 static int ext4_release_dquot(struct dquot
*dquot
);
1036 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1037 static int ext4_write_info(struct super_block
*sb
, int type
);
1038 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1040 static int ext4_quota_on_sysfile(struct super_block
*sb
, int type
,
1042 static int ext4_quota_off(struct super_block
*sb
, int type
);
1043 static int ext4_quota_off_sysfile(struct super_block
*sb
, int type
);
1044 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1045 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1046 size_t len
, loff_t off
);
1047 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1048 const char *data
, size_t len
, loff_t off
);
1049 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
1050 unsigned int flags
);
1051 static int ext4_enable_quotas(struct super_block
*sb
);
1053 static const struct dquot_operations ext4_quota_operations
= {
1054 .get_reserved_space
= ext4_get_reserved_space
,
1055 .write_dquot
= ext4_write_dquot
,
1056 .acquire_dquot
= ext4_acquire_dquot
,
1057 .release_dquot
= ext4_release_dquot
,
1058 .mark_dirty
= ext4_mark_dquot_dirty
,
1059 .write_info
= ext4_write_info
,
1060 .alloc_dquot
= dquot_alloc
,
1061 .destroy_dquot
= dquot_destroy
,
1064 static const struct quotactl_ops ext4_qctl_operations
= {
1065 .quota_on
= ext4_quota_on
,
1066 .quota_off
= ext4_quota_off
,
1067 .quota_sync
= dquot_quota_sync
,
1068 .get_info
= dquot_get_dqinfo
,
1069 .set_info
= dquot_set_dqinfo
,
1070 .get_dqblk
= dquot_get_dqblk
,
1071 .set_dqblk
= dquot_set_dqblk
1074 static const struct quotactl_ops ext4_qctl_sysfile_operations
= {
1075 .quota_on_meta
= ext4_quota_on_sysfile
,
1076 .quota_off
= ext4_quota_off_sysfile
,
1077 .quota_sync
= dquot_quota_sync
,
1078 .get_info
= dquot_get_dqinfo
,
1079 .set_info
= dquot_set_dqinfo
,
1080 .get_dqblk
= dquot_get_dqblk
,
1081 .set_dqblk
= dquot_set_dqblk
1085 static const struct super_operations ext4_sops
= {
1086 .alloc_inode
= ext4_alloc_inode
,
1087 .destroy_inode
= ext4_destroy_inode
,
1088 .write_inode
= ext4_write_inode
,
1089 .dirty_inode
= ext4_dirty_inode
,
1090 .drop_inode
= ext4_drop_inode
,
1091 .evict_inode
= ext4_evict_inode
,
1092 .put_super
= ext4_put_super
,
1093 .sync_fs
= ext4_sync_fs
,
1094 .freeze_fs
= ext4_freeze
,
1095 .unfreeze_fs
= ext4_unfreeze
,
1096 .statfs
= ext4_statfs
,
1097 .remount_fs
= ext4_remount
,
1098 .show_options
= ext4_show_options
,
1100 .quota_read
= ext4_quota_read
,
1101 .quota_write
= ext4_quota_write
,
1103 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1106 static const struct super_operations ext4_nojournal_sops
= {
1107 .alloc_inode
= ext4_alloc_inode
,
1108 .destroy_inode
= ext4_destroy_inode
,
1109 .write_inode
= ext4_write_inode
,
1110 .dirty_inode
= ext4_dirty_inode
,
1111 .drop_inode
= ext4_drop_inode
,
1112 .evict_inode
= ext4_evict_inode
,
1113 .sync_fs
= ext4_sync_fs_nojournal
,
1114 .put_super
= ext4_put_super
,
1115 .statfs
= ext4_statfs
,
1116 .remount_fs
= ext4_remount
,
1117 .show_options
= ext4_show_options
,
1119 .quota_read
= ext4_quota_read
,
1120 .quota_write
= ext4_quota_write
,
1122 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1125 static const struct export_operations ext4_export_ops
= {
1126 .fh_to_dentry
= ext4_fh_to_dentry
,
1127 .fh_to_parent
= ext4_fh_to_parent
,
1128 .get_parent
= ext4_get_parent
,
1132 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1133 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1134 Opt_nouid32
, Opt_debug
, Opt_removed
,
1135 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1136 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
,
1137 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
,
1138 Opt_journal_dev
, Opt_journal_checksum
, Opt_journal_async_commit
,
1139 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1140 Opt_data_err_abort
, Opt_data_err_ignore
,
1141 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1142 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1143 Opt_noquota
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1144 Opt_usrquota
, Opt_grpquota
, Opt_i_version
,
1145 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
, Opt_mblk_io_submit
,
1146 Opt_nomblk_io_submit
, Opt_block_validity
, Opt_noblock_validity
,
1147 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1148 Opt_dioread_nolock
, Opt_dioread_lock
,
1149 Opt_discard
, Opt_nodiscard
, Opt_init_itable
, Opt_noinit_itable
,
1150 Opt_max_dir_size_kb
,
1153 static const match_table_t tokens
= {
1154 {Opt_bsd_df
, "bsddf"},
1155 {Opt_minix_df
, "minixdf"},
1156 {Opt_grpid
, "grpid"},
1157 {Opt_grpid
, "bsdgroups"},
1158 {Opt_nogrpid
, "nogrpid"},
1159 {Opt_nogrpid
, "sysvgroups"},
1160 {Opt_resgid
, "resgid=%u"},
1161 {Opt_resuid
, "resuid=%u"},
1163 {Opt_err_cont
, "errors=continue"},
1164 {Opt_err_panic
, "errors=panic"},
1165 {Opt_err_ro
, "errors=remount-ro"},
1166 {Opt_nouid32
, "nouid32"},
1167 {Opt_debug
, "debug"},
1168 {Opt_removed
, "oldalloc"},
1169 {Opt_removed
, "orlov"},
1170 {Opt_user_xattr
, "user_xattr"},
1171 {Opt_nouser_xattr
, "nouser_xattr"},
1173 {Opt_noacl
, "noacl"},
1174 {Opt_noload
, "norecovery"},
1175 {Opt_noload
, "noload"},
1176 {Opt_removed
, "nobh"},
1177 {Opt_removed
, "bh"},
1178 {Opt_commit
, "commit=%u"},
1179 {Opt_min_batch_time
, "min_batch_time=%u"},
1180 {Opt_max_batch_time
, "max_batch_time=%u"},
1181 {Opt_journal_dev
, "journal_dev=%u"},
1182 {Opt_journal_checksum
, "journal_checksum"},
1183 {Opt_journal_async_commit
, "journal_async_commit"},
1184 {Opt_abort
, "abort"},
1185 {Opt_data_journal
, "data=journal"},
1186 {Opt_data_ordered
, "data=ordered"},
1187 {Opt_data_writeback
, "data=writeback"},
1188 {Opt_data_err_abort
, "data_err=abort"},
1189 {Opt_data_err_ignore
, "data_err=ignore"},
1190 {Opt_offusrjquota
, "usrjquota="},
1191 {Opt_usrjquota
, "usrjquota=%s"},
1192 {Opt_offgrpjquota
, "grpjquota="},
1193 {Opt_grpjquota
, "grpjquota=%s"},
1194 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1195 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1196 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1197 {Opt_grpquota
, "grpquota"},
1198 {Opt_noquota
, "noquota"},
1199 {Opt_quota
, "quota"},
1200 {Opt_usrquota
, "usrquota"},
1201 {Opt_barrier
, "barrier=%u"},
1202 {Opt_barrier
, "barrier"},
1203 {Opt_nobarrier
, "nobarrier"},
1204 {Opt_i_version
, "i_version"},
1205 {Opt_stripe
, "stripe=%u"},
1206 {Opt_delalloc
, "delalloc"},
1207 {Opt_nodelalloc
, "nodelalloc"},
1208 {Opt_removed
, "mblk_io_submit"},
1209 {Opt_removed
, "nomblk_io_submit"},
1210 {Opt_block_validity
, "block_validity"},
1211 {Opt_noblock_validity
, "noblock_validity"},
1212 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1213 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1214 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1215 {Opt_auto_da_alloc
, "auto_da_alloc"},
1216 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1217 {Opt_dioread_nolock
, "dioread_nolock"},
1218 {Opt_dioread_lock
, "dioread_lock"},
1219 {Opt_discard
, "discard"},
1220 {Opt_nodiscard
, "nodiscard"},
1221 {Opt_init_itable
, "init_itable=%u"},
1222 {Opt_init_itable
, "init_itable"},
1223 {Opt_noinit_itable
, "noinit_itable"},
1224 {Opt_max_dir_size_kb
, "max_dir_size_kb=%u"},
1225 {Opt_removed
, "check=none"}, /* mount option from ext2/3 */
1226 {Opt_removed
, "nocheck"}, /* mount option from ext2/3 */
1227 {Opt_removed
, "reservation"}, /* mount option from ext2/3 */
1228 {Opt_removed
, "noreservation"}, /* mount option from ext2/3 */
1229 {Opt_removed
, "journal=%u"}, /* mount option from ext2/3 */
1233 static ext4_fsblk_t
get_sb_block(void **data
)
1235 ext4_fsblk_t sb_block
;
1236 char *options
= (char *) *data
;
1238 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1239 return 1; /* Default location */
1242 /* TODO: use simple_strtoll with >32bit ext4 */
1243 sb_block
= simple_strtoul(options
, &options
, 0);
1244 if (*options
&& *options
!= ',') {
1245 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1249 if (*options
== ',')
1251 *data
= (void *) options
;
1256 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1257 static char deprecated_msg
[] = "Mount option \"%s\" will be removed by %s\n"
1258 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1261 static int set_qf_name(struct super_block
*sb
, int qtype
, substring_t
*args
)
1263 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1267 if (sb_any_quota_loaded(sb
) &&
1268 !sbi
->s_qf_names
[qtype
]) {
1269 ext4_msg(sb
, KERN_ERR
,
1270 "Cannot change journaled "
1271 "quota options when quota turned on");
1274 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
)) {
1275 ext4_msg(sb
, KERN_ERR
, "Cannot set journaled quota options "
1276 "when QUOTA feature is enabled");
1279 qname
= match_strdup(args
);
1281 ext4_msg(sb
, KERN_ERR
,
1282 "Not enough memory for storing quotafile name");
1285 if (sbi
->s_qf_names
[qtype
]) {
1286 if (strcmp(sbi
->s_qf_names
[qtype
], qname
) == 0)
1289 ext4_msg(sb
, KERN_ERR
,
1290 "%s quota file already specified",
1294 if (strchr(qname
, '/')) {
1295 ext4_msg(sb
, KERN_ERR
,
1296 "quotafile must be on filesystem root");
1299 sbi
->s_qf_names
[qtype
] = qname
;
1307 static int clear_qf_name(struct super_block
*sb
, int qtype
)
1310 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1312 if (sb_any_quota_loaded(sb
) &&
1313 sbi
->s_qf_names
[qtype
]) {
1314 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled quota options"
1315 " when quota turned on");
1318 kfree(sbi
->s_qf_names
[qtype
]);
1319 sbi
->s_qf_names
[qtype
] = NULL
;
1324 #define MOPT_SET 0x0001
1325 #define MOPT_CLEAR 0x0002
1326 #define MOPT_NOSUPPORT 0x0004
1327 #define MOPT_EXPLICIT 0x0008
1328 #define MOPT_CLEAR_ERR 0x0010
1329 #define MOPT_GTE0 0x0020
1332 #define MOPT_QFMT 0x0040
1334 #define MOPT_Q MOPT_NOSUPPORT
1335 #define MOPT_QFMT MOPT_NOSUPPORT
1337 #define MOPT_DATAJ 0x0080
1338 #define MOPT_NO_EXT2 0x0100
1339 #define MOPT_NO_EXT3 0x0200
1340 #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1342 static const struct mount_opts
{
1346 } ext4_mount_opts
[] = {
1347 {Opt_minix_df
, EXT4_MOUNT_MINIX_DF
, MOPT_SET
},
1348 {Opt_bsd_df
, EXT4_MOUNT_MINIX_DF
, MOPT_CLEAR
},
1349 {Opt_grpid
, EXT4_MOUNT_GRPID
, MOPT_SET
},
1350 {Opt_nogrpid
, EXT4_MOUNT_GRPID
, MOPT_CLEAR
},
1351 {Opt_block_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_SET
},
1352 {Opt_noblock_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_CLEAR
},
1353 {Opt_dioread_nolock
, EXT4_MOUNT_DIOREAD_NOLOCK
,
1354 MOPT_EXT4_ONLY
| MOPT_SET
},
1355 {Opt_dioread_lock
, EXT4_MOUNT_DIOREAD_NOLOCK
,
1356 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1357 {Opt_discard
, EXT4_MOUNT_DISCARD
, MOPT_SET
},
1358 {Opt_nodiscard
, EXT4_MOUNT_DISCARD
, MOPT_CLEAR
},
1359 {Opt_delalloc
, EXT4_MOUNT_DELALLOC
,
1360 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1361 {Opt_nodelalloc
, EXT4_MOUNT_DELALLOC
,
1362 MOPT_EXT4_ONLY
| MOPT_CLEAR
| MOPT_EXPLICIT
},
1363 {Opt_journal_checksum
, EXT4_MOUNT_JOURNAL_CHECKSUM
,
1364 MOPT_EXT4_ONLY
| MOPT_SET
},
1365 {Opt_journal_async_commit
, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT
|
1366 EXT4_MOUNT_JOURNAL_CHECKSUM
),
1367 MOPT_EXT4_ONLY
| MOPT_SET
},
1368 {Opt_noload
, EXT4_MOUNT_NOLOAD
, MOPT_NO_EXT2
| MOPT_SET
},
1369 {Opt_err_panic
, EXT4_MOUNT_ERRORS_PANIC
, MOPT_SET
| MOPT_CLEAR_ERR
},
1370 {Opt_err_ro
, EXT4_MOUNT_ERRORS_RO
, MOPT_SET
| MOPT_CLEAR_ERR
},
1371 {Opt_err_cont
, EXT4_MOUNT_ERRORS_CONT
, MOPT_SET
| MOPT_CLEAR_ERR
},
1372 {Opt_data_err_abort
, EXT4_MOUNT_DATA_ERR_ABORT
,
1373 MOPT_NO_EXT2
| MOPT_SET
},
1374 {Opt_data_err_ignore
, EXT4_MOUNT_DATA_ERR_ABORT
,
1375 MOPT_NO_EXT2
| MOPT_CLEAR
},
1376 {Opt_barrier
, EXT4_MOUNT_BARRIER
, MOPT_SET
},
1377 {Opt_nobarrier
, EXT4_MOUNT_BARRIER
, MOPT_CLEAR
},
1378 {Opt_noauto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_SET
},
1379 {Opt_auto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_CLEAR
},
1380 {Opt_noinit_itable
, EXT4_MOUNT_INIT_INODE_TABLE
, MOPT_CLEAR
},
1381 {Opt_commit
, 0, MOPT_GTE0
},
1382 {Opt_max_batch_time
, 0, MOPT_GTE0
},
1383 {Opt_min_batch_time
, 0, MOPT_GTE0
},
1384 {Opt_inode_readahead_blks
, 0, MOPT_GTE0
},
1385 {Opt_init_itable
, 0, MOPT_GTE0
},
1386 {Opt_stripe
, 0, MOPT_GTE0
},
1387 {Opt_resuid
, 0, MOPT_GTE0
},
1388 {Opt_resgid
, 0, MOPT_GTE0
},
1389 {Opt_journal_dev
, 0, MOPT_GTE0
},
1390 {Opt_journal_ioprio
, 0, MOPT_GTE0
},
1391 {Opt_data_journal
, EXT4_MOUNT_JOURNAL_DATA
, MOPT_NO_EXT2
| MOPT_DATAJ
},
1392 {Opt_data_ordered
, EXT4_MOUNT_ORDERED_DATA
, MOPT_NO_EXT2
| MOPT_DATAJ
},
1393 {Opt_data_writeback
, EXT4_MOUNT_WRITEBACK_DATA
,
1394 MOPT_NO_EXT2
| MOPT_DATAJ
},
1395 {Opt_user_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_SET
},
1396 {Opt_nouser_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_CLEAR
},
1397 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1398 {Opt_acl
, EXT4_MOUNT_POSIX_ACL
, MOPT_SET
},
1399 {Opt_noacl
, EXT4_MOUNT_POSIX_ACL
, MOPT_CLEAR
},
1401 {Opt_acl
, 0, MOPT_NOSUPPORT
},
1402 {Opt_noacl
, 0, MOPT_NOSUPPORT
},
1404 {Opt_nouid32
, EXT4_MOUNT_NO_UID32
, MOPT_SET
},
1405 {Opt_debug
, EXT4_MOUNT_DEBUG
, MOPT_SET
},
1406 {Opt_quota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
, MOPT_SET
| MOPT_Q
},
1407 {Opt_usrquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
,
1409 {Opt_grpquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_GRPQUOTA
,
1411 {Opt_noquota
, (EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
|
1412 EXT4_MOUNT_GRPQUOTA
), MOPT_CLEAR
| MOPT_Q
},
1413 {Opt_usrjquota
, 0, MOPT_Q
},
1414 {Opt_grpjquota
, 0, MOPT_Q
},
1415 {Opt_offusrjquota
, 0, MOPT_Q
},
1416 {Opt_offgrpjquota
, 0, MOPT_Q
},
1417 {Opt_jqfmt_vfsold
, QFMT_VFS_OLD
, MOPT_QFMT
},
1418 {Opt_jqfmt_vfsv0
, QFMT_VFS_V0
, MOPT_QFMT
},
1419 {Opt_jqfmt_vfsv1
, QFMT_VFS_V1
, MOPT_QFMT
},
1420 {Opt_max_dir_size_kb
, 0, MOPT_GTE0
},
1424 static int handle_mount_opt(struct super_block
*sb
, char *opt
, int token
,
1425 substring_t
*args
, unsigned long *journal_devnum
,
1426 unsigned int *journal_ioprio
, int is_remount
)
1428 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1429 const struct mount_opts
*m
;
1435 if (token
== Opt_usrjquota
)
1436 return set_qf_name(sb
, USRQUOTA
, &args
[0]);
1437 else if (token
== Opt_grpjquota
)
1438 return set_qf_name(sb
, GRPQUOTA
, &args
[0]);
1439 else if (token
== Opt_offusrjquota
)
1440 return clear_qf_name(sb
, USRQUOTA
);
1441 else if (token
== Opt_offgrpjquota
)
1442 return clear_qf_name(sb
, GRPQUOTA
);
1446 case Opt_nouser_xattr
:
1447 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, opt
, "3.5");
1450 return 1; /* handled by get_sb_block() */
1452 ext4_msg(sb
, KERN_WARNING
, "Ignoring removed %s option", opt
);
1455 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1458 sb
->s_flags
|= MS_I_VERSION
;
1462 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++)
1463 if (token
== m
->token
)
1466 if (m
->token
== Opt_err
) {
1467 ext4_msg(sb
, KERN_ERR
, "Unrecognized mount option \"%s\" "
1468 "or missing value", opt
);
1472 if ((m
->flags
& MOPT_NO_EXT2
) && IS_EXT2_SB(sb
)) {
1473 ext4_msg(sb
, KERN_ERR
,
1474 "Mount option \"%s\" incompatible with ext2", opt
);
1477 if ((m
->flags
& MOPT_NO_EXT3
) && IS_EXT3_SB(sb
)) {
1478 ext4_msg(sb
, KERN_ERR
,
1479 "Mount option \"%s\" incompatible with ext3", opt
);
1483 if (args
->from
&& match_int(args
, &arg
))
1485 if (args
->from
&& (m
->flags
& MOPT_GTE0
) && (arg
< 0))
1487 if (m
->flags
& MOPT_EXPLICIT
)
1488 set_opt2(sb
, EXPLICIT_DELALLOC
);
1489 if (m
->flags
& MOPT_CLEAR_ERR
)
1490 clear_opt(sb
, ERRORS_MASK
);
1491 if (token
== Opt_noquota
&& sb_any_quota_loaded(sb
)) {
1492 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1493 "options when quota turned on");
1497 if (m
->flags
& MOPT_NOSUPPORT
) {
1498 ext4_msg(sb
, KERN_ERR
, "%s option not supported", opt
);
1499 } else if (token
== Opt_commit
) {
1501 arg
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1502 sbi
->s_commit_interval
= HZ
* arg
;
1503 } else if (token
== Opt_max_batch_time
) {
1505 arg
= EXT4_DEF_MAX_BATCH_TIME
;
1506 sbi
->s_max_batch_time
= arg
;
1507 } else if (token
== Opt_min_batch_time
) {
1508 sbi
->s_min_batch_time
= arg
;
1509 } else if (token
== Opt_inode_readahead_blks
) {
1510 if (arg
&& (arg
> (1 << 30) || !is_power_of_2(arg
))) {
1511 ext4_msg(sb
, KERN_ERR
,
1512 "EXT4-fs: inode_readahead_blks must be "
1513 "0 or a power of 2 smaller than 2^31");
1516 sbi
->s_inode_readahead_blks
= arg
;
1517 } else if (token
== Opt_init_itable
) {
1518 set_opt(sb
, INIT_INODE_TABLE
);
1520 arg
= EXT4_DEF_LI_WAIT_MULT
;
1521 sbi
->s_li_wait_mult
= arg
;
1522 } else if (token
== Opt_max_dir_size_kb
) {
1523 sbi
->s_max_dir_size_kb
= arg
;
1524 } else if (token
== Opt_stripe
) {
1525 sbi
->s_stripe
= arg
;
1526 } else if (token
== Opt_resuid
) {
1527 uid
= make_kuid(current_user_ns(), arg
);
1528 if (!uid_valid(uid
)) {
1529 ext4_msg(sb
, KERN_ERR
, "Invalid uid value %d", arg
);
1532 sbi
->s_resuid
= uid
;
1533 } else if (token
== Opt_resgid
) {
1534 gid
= make_kgid(current_user_ns(), arg
);
1535 if (!gid_valid(gid
)) {
1536 ext4_msg(sb
, KERN_ERR
, "Invalid gid value %d", arg
);
1539 sbi
->s_resgid
= gid
;
1540 } else if (token
== Opt_journal_dev
) {
1542 ext4_msg(sb
, KERN_ERR
,
1543 "Cannot specify journal on remount");
1546 *journal_devnum
= arg
;
1547 } else if (token
== Opt_journal_ioprio
) {
1549 ext4_msg(sb
, KERN_ERR
, "Invalid journal IO priority"
1554 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
, arg
);
1555 } else if (m
->flags
& MOPT_DATAJ
) {
1557 if (!sbi
->s_journal
)
1558 ext4_msg(sb
, KERN_WARNING
, "Remounting file system with no journal so ignoring journalled data option");
1559 else if (test_opt(sb
, DATA_FLAGS
) != m
->mount_opt
) {
1560 ext4_msg(sb
, KERN_ERR
,
1561 "Cannot change data mode on remount");
1565 clear_opt(sb
, DATA_FLAGS
);
1566 sbi
->s_mount_opt
|= m
->mount_opt
;
1569 } else if (m
->flags
& MOPT_QFMT
) {
1570 if (sb_any_quota_loaded(sb
) &&
1571 sbi
->s_jquota_fmt
!= m
->mount_opt
) {
1572 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled "
1573 "quota options when quota turned on");
1576 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
1577 EXT4_FEATURE_RO_COMPAT_QUOTA
)) {
1578 ext4_msg(sb
, KERN_ERR
,
1579 "Cannot set journaled quota options "
1580 "when QUOTA feature is enabled");
1583 sbi
->s_jquota_fmt
= m
->mount_opt
;
1588 if (m
->flags
& MOPT_CLEAR
)
1590 else if (unlikely(!(m
->flags
& MOPT_SET
))) {
1591 ext4_msg(sb
, KERN_WARNING
,
1592 "buggy handling of option %s", opt
);
1597 sbi
->s_mount_opt
|= m
->mount_opt
;
1599 sbi
->s_mount_opt
&= ~m
->mount_opt
;
1604 static int parse_options(char *options
, struct super_block
*sb
,
1605 unsigned long *journal_devnum
,
1606 unsigned int *journal_ioprio
,
1609 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1611 substring_t args
[MAX_OPT_ARGS
];
1617 while ((p
= strsep(&options
, ",")) != NULL
) {
1621 * Initialize args struct so we know whether arg was
1622 * found; some options take optional arguments.
1624 args
[0].to
= args
[0].from
= NULL
;
1625 token
= match_token(p
, tokens
, args
);
1626 if (handle_mount_opt(sb
, p
, token
, args
, journal_devnum
,
1627 journal_ioprio
, is_remount
) < 0)
1631 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
) &&
1632 (test_opt(sb
, USRQUOTA
) || test_opt(sb
, GRPQUOTA
))) {
1633 ext4_msg(sb
, KERN_ERR
, "Cannot set quota options when QUOTA "
1634 "feature is enabled");
1637 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1638 if (test_opt(sb
, USRQUOTA
) && sbi
->s_qf_names
[USRQUOTA
])
1639 clear_opt(sb
, USRQUOTA
);
1641 if (test_opt(sb
, GRPQUOTA
) && sbi
->s_qf_names
[GRPQUOTA
])
1642 clear_opt(sb
, GRPQUOTA
);
1644 if (test_opt(sb
, GRPQUOTA
) || test_opt(sb
, USRQUOTA
)) {
1645 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1650 if (!sbi
->s_jquota_fmt
) {
1651 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1656 if (sbi
->s_jquota_fmt
) {
1657 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1658 "specified with no journaling "
1664 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
1666 BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
1668 if (blocksize
< PAGE_CACHE_SIZE
) {
1669 ext4_msg(sb
, KERN_ERR
, "can't mount with "
1670 "dioread_nolock if block size != PAGE_SIZE");
1677 static inline void ext4_show_quota_options(struct seq_file
*seq
,
1678 struct super_block
*sb
)
1680 #if defined(CONFIG_QUOTA)
1681 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1683 if (sbi
->s_jquota_fmt
) {
1686 switch (sbi
->s_jquota_fmt
) {
1697 seq_printf(seq
, ",jqfmt=%s", fmtname
);
1700 if (sbi
->s_qf_names
[USRQUOTA
])
1701 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
1703 if (sbi
->s_qf_names
[GRPQUOTA
])
1704 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
1706 if (test_opt(sb
, USRQUOTA
))
1707 seq_puts(seq
, ",usrquota");
1709 if (test_opt(sb
, GRPQUOTA
))
1710 seq_puts(seq
, ",grpquota");
1714 static const char *token2str(int token
)
1716 const struct match_token
*t
;
1718 for (t
= tokens
; t
->token
!= Opt_err
; t
++)
1719 if (t
->token
== token
&& !strchr(t
->pattern
, '='))
1726 * - it's set to a non-default value OR
1727 * - if the per-sb default is different from the global default
1729 static int _ext4_show_options(struct seq_file
*seq
, struct super_block
*sb
,
1732 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1733 struct ext4_super_block
*es
= sbi
->s_es
;
1734 int def_errors
, def_mount_opt
= nodefs
? 0 : sbi
->s_def_mount_opt
;
1735 const struct mount_opts
*m
;
1736 char sep
= nodefs
? '\n' : ',';
1738 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1739 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1741 if (sbi
->s_sb_block
!= 1)
1742 SEQ_OPTS_PRINT("sb=%llu", sbi
->s_sb_block
);
1744 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++) {
1745 int want_set
= m
->flags
& MOPT_SET
;
1746 if (((m
->flags
& (MOPT_SET
|MOPT_CLEAR
)) == 0) ||
1747 (m
->flags
& MOPT_CLEAR_ERR
))
1749 if (!(m
->mount_opt
& (sbi
->s_mount_opt
^ def_mount_opt
)))
1750 continue; /* skip if same as the default */
1752 (sbi
->s_mount_opt
& m
->mount_opt
) != m
->mount_opt
) ||
1753 (!want_set
&& (sbi
->s_mount_opt
& m
->mount_opt
)))
1754 continue; /* select Opt_noFoo vs Opt_Foo */
1755 SEQ_OPTS_PRINT("%s", token2str(m
->token
));
1758 if (nodefs
|| !uid_eq(sbi
->s_resuid
, make_kuid(&init_user_ns
, EXT4_DEF_RESUID
)) ||
1759 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
)
1760 SEQ_OPTS_PRINT("resuid=%u",
1761 from_kuid_munged(&init_user_ns
, sbi
->s_resuid
));
1762 if (nodefs
|| !gid_eq(sbi
->s_resgid
, make_kgid(&init_user_ns
, EXT4_DEF_RESGID
)) ||
1763 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
)
1764 SEQ_OPTS_PRINT("resgid=%u",
1765 from_kgid_munged(&init_user_ns
, sbi
->s_resgid
));
1766 def_errors
= nodefs
? -1 : le16_to_cpu(es
->s_errors
);
1767 if (test_opt(sb
, ERRORS_RO
) && def_errors
!= EXT4_ERRORS_RO
)
1768 SEQ_OPTS_PUTS("errors=remount-ro");
1769 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
1770 SEQ_OPTS_PUTS("errors=continue");
1771 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
1772 SEQ_OPTS_PUTS("errors=panic");
1773 if (nodefs
|| sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
)
1774 SEQ_OPTS_PRINT("commit=%lu", sbi
->s_commit_interval
/ HZ
);
1775 if (nodefs
|| sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
)
1776 SEQ_OPTS_PRINT("min_batch_time=%u", sbi
->s_min_batch_time
);
1777 if (nodefs
|| sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
)
1778 SEQ_OPTS_PRINT("max_batch_time=%u", sbi
->s_max_batch_time
);
1779 if (sb
->s_flags
& MS_I_VERSION
)
1780 SEQ_OPTS_PUTS("i_version");
1781 if (nodefs
|| sbi
->s_stripe
)
1782 SEQ_OPTS_PRINT("stripe=%lu", sbi
->s_stripe
);
1783 if (EXT4_MOUNT_DATA_FLAGS
& (sbi
->s_mount_opt
^ def_mount_opt
)) {
1784 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
1785 SEQ_OPTS_PUTS("data=journal");
1786 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
1787 SEQ_OPTS_PUTS("data=ordered");
1788 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
1789 SEQ_OPTS_PUTS("data=writeback");
1792 sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
1793 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1794 sbi
->s_inode_readahead_blks
);
1796 if (nodefs
|| (test_opt(sb
, INIT_INODE_TABLE
) &&
1797 (sbi
->s_li_wait_mult
!= EXT4_DEF_LI_WAIT_MULT
)))
1798 SEQ_OPTS_PRINT("init_itable=%u", sbi
->s_li_wait_mult
);
1799 if (nodefs
|| sbi
->s_max_dir_size_kb
)
1800 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi
->s_max_dir_size_kb
);
1802 ext4_show_quota_options(seq
, sb
);
1806 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
)
1808 return _ext4_show_options(seq
, root
->d_sb
, 0);
1811 static int options_seq_show(struct seq_file
*seq
, void *offset
)
1813 struct super_block
*sb
= seq
->private;
1816 seq_puts(seq
, (sb
->s_flags
& MS_RDONLY
) ? "ro" : "rw");
1817 rc
= _ext4_show_options(seq
, sb
, 1);
1818 seq_puts(seq
, "\n");
1822 static int options_open_fs(struct inode
*inode
, struct file
*file
)
1824 return single_open(file
, options_seq_show
, PDE_DATA(inode
));
1827 static const struct file_operations ext4_seq_options_fops
= {
1828 .owner
= THIS_MODULE
,
1829 .open
= options_open_fs
,
1831 .llseek
= seq_lseek
,
1832 .release
= single_release
,
1835 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1838 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1841 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1842 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
1843 "forcing read-only mode");
1848 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1849 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
1850 "running e2fsck is recommended");
1851 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1852 ext4_msg(sb
, KERN_WARNING
,
1853 "warning: mounting fs with errors, "
1854 "running e2fsck is recommended");
1855 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) > 0 &&
1856 le16_to_cpu(es
->s_mnt_count
) >=
1857 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1858 ext4_msg(sb
, KERN_WARNING
,
1859 "warning: maximal mount count reached, "
1860 "running e2fsck is recommended");
1861 else if (le32_to_cpu(es
->s_checkinterval
) &&
1862 (le32_to_cpu(es
->s_lastcheck
) +
1863 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1864 ext4_msg(sb
, KERN_WARNING
,
1865 "warning: checktime reached, "
1866 "running e2fsck is recommended");
1867 if (!sbi
->s_journal
)
1868 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1869 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1870 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1871 le16_add_cpu(&es
->s_mnt_count
, 1);
1872 es
->s_mtime
= cpu_to_le32(get_seconds());
1873 ext4_update_dynamic_rev(sb
);
1875 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1877 ext4_commit_super(sb
, 1);
1879 if (test_opt(sb
, DEBUG
))
1880 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
1881 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1883 sbi
->s_groups_count
,
1884 EXT4_BLOCKS_PER_GROUP(sb
),
1885 EXT4_INODES_PER_GROUP(sb
),
1886 sbi
->s_mount_opt
, sbi
->s_mount_opt2
);
1888 cleancache_init_fs(sb
);
1892 int ext4_alloc_flex_bg_array(struct super_block
*sb
, ext4_group_t ngroup
)
1894 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1895 struct flex_groups
*new_groups
;
1898 if (!sbi
->s_log_groups_per_flex
)
1901 size
= ext4_flex_group(sbi
, ngroup
- 1) + 1;
1902 if (size
<= sbi
->s_flex_groups_allocated
)
1905 size
= roundup_pow_of_two(size
* sizeof(struct flex_groups
));
1906 new_groups
= ext4_kvzalloc(size
, GFP_KERNEL
);
1908 ext4_msg(sb
, KERN_ERR
, "not enough memory for %d flex groups",
1909 size
/ (int) sizeof(struct flex_groups
));
1913 if (sbi
->s_flex_groups
) {
1914 memcpy(new_groups
, sbi
->s_flex_groups
,
1915 (sbi
->s_flex_groups_allocated
*
1916 sizeof(struct flex_groups
)));
1917 ext4_kvfree(sbi
->s_flex_groups
);
1919 sbi
->s_flex_groups
= new_groups
;
1920 sbi
->s_flex_groups_allocated
= size
/ sizeof(struct flex_groups
);
1924 static int ext4_fill_flex_info(struct super_block
*sb
)
1926 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1927 struct ext4_group_desc
*gdp
= NULL
;
1928 ext4_group_t flex_group
;
1931 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1932 if (sbi
->s_log_groups_per_flex
< 1 || sbi
->s_log_groups_per_flex
> 31) {
1933 sbi
->s_log_groups_per_flex
= 0;
1937 err
= ext4_alloc_flex_bg_array(sb
, sbi
->s_groups_count
);
1941 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1942 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1944 flex_group
= ext4_flex_group(sbi
, i
);
1945 atomic_add(ext4_free_inodes_count(sb
, gdp
),
1946 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
1947 atomic64_add(ext4_free_group_clusters(sb
, gdp
),
1948 &sbi
->s_flex_groups
[flex_group
].free_clusters
);
1949 atomic_add(ext4_used_dirs_count(sb
, gdp
),
1950 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
1958 static __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
1959 struct ext4_group_desc
*gdp
)
1963 __le32 le_group
= cpu_to_le32(block_group
);
1965 if ((sbi
->s_es
->s_feature_ro_compat
&
1966 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))) {
1967 /* Use new metadata_csum algorithm */
1971 save_csum
= gdp
->bg_checksum
;
1972 gdp
->bg_checksum
= 0;
1973 csum32
= ext4_chksum(sbi
, sbi
->s_csum_seed
, (__u8
*)&le_group
,
1975 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)gdp
,
1977 gdp
->bg_checksum
= save_csum
;
1979 crc
= csum32
& 0xFFFF;
1983 /* old crc16 code */
1984 offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
1986 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
1987 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
1988 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
1989 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
1990 /* for checksum of struct ext4_group_desc do the rest...*/
1991 if ((sbi
->s_es
->s_feature_incompat
&
1992 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
1993 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
1994 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
1995 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
1999 return cpu_to_le16(crc
);
2002 int ext4_group_desc_csum_verify(struct super_block
*sb
, __u32 block_group
,
2003 struct ext4_group_desc
*gdp
)
2005 if (ext4_has_group_desc_csum(sb
) &&
2006 (gdp
->bg_checksum
!= ext4_group_desc_csum(EXT4_SB(sb
),
2013 void ext4_group_desc_csum_set(struct super_block
*sb
, __u32 block_group
,
2014 struct ext4_group_desc
*gdp
)
2016 if (!ext4_has_group_desc_csum(sb
))
2018 gdp
->bg_checksum
= ext4_group_desc_csum(EXT4_SB(sb
), block_group
, gdp
);
2021 /* Called at mount-time, super-block is locked */
2022 static int ext4_check_descriptors(struct super_block
*sb
,
2023 ext4_group_t
*first_not_zeroed
)
2025 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2026 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
2027 ext4_fsblk_t last_block
;
2028 ext4_fsblk_t block_bitmap
;
2029 ext4_fsblk_t inode_bitmap
;
2030 ext4_fsblk_t inode_table
;
2031 int flexbg_flag
= 0;
2032 ext4_group_t i
, grp
= sbi
->s_groups_count
;
2034 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
2037 ext4_debug("Checking group descriptors");
2039 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
2040 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2042 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
2043 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
2045 last_block
= first_block
+
2046 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2048 if ((grp
== sbi
->s_groups_count
) &&
2049 !(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2052 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
2053 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
2054 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2055 "Block bitmap for group %u not in group "
2056 "(block %llu)!", i
, block_bitmap
);
2059 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
2060 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
2061 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2062 "Inode bitmap for group %u not in group "
2063 "(block %llu)!", i
, inode_bitmap
);
2066 inode_table
= ext4_inode_table(sb
, gdp
);
2067 if (inode_table
< first_block
||
2068 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
2069 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2070 "Inode table for group %u not in group "
2071 "(block %llu)!", i
, inode_table
);
2074 ext4_lock_group(sb
, i
);
2075 if (!ext4_group_desc_csum_verify(sb
, i
, gdp
)) {
2076 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2077 "Checksum for group %u failed (%u!=%u)",
2078 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
2079 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
2080 if (!(sb
->s_flags
& MS_RDONLY
)) {
2081 ext4_unlock_group(sb
, i
);
2085 ext4_unlock_group(sb
, i
);
2087 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
2089 if (NULL
!= first_not_zeroed
)
2090 *first_not_zeroed
= grp
;
2092 ext4_free_blocks_count_set(sbi
->s_es
,
2093 EXT4_C2B(sbi
, ext4_count_free_clusters(sb
)));
2094 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
2098 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2099 * the superblock) which were deleted from all directories, but held open by
2100 * a process at the time of a crash. We walk the list and try to delete these
2101 * inodes at recovery time (only with a read-write filesystem).
2103 * In order to keep the orphan inode chain consistent during traversal (in
2104 * case of crash during recovery), we link each inode into the superblock
2105 * orphan list_head and handle it the same way as an inode deletion during
2106 * normal operation (which journals the operations for us).
2108 * We only do an iget() and an iput() on each inode, which is very safe if we
2109 * accidentally point at an in-use or already deleted inode. The worst that
2110 * can happen in this case is that we get a "bit already cleared" message from
2111 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2112 * e2fsck was run on this filesystem, and it must have already done the orphan
2113 * inode cleanup for us, so we can safely abort without any further action.
2115 static void ext4_orphan_cleanup(struct super_block
*sb
,
2116 struct ext4_super_block
*es
)
2118 unsigned int s_flags
= sb
->s_flags
;
2119 int nr_orphans
= 0, nr_truncates
= 0;
2123 if (!es
->s_last_orphan
) {
2124 jbd_debug(4, "no orphan inodes to clean up\n");
2128 if (bdev_read_only(sb
->s_bdev
)) {
2129 ext4_msg(sb
, KERN_ERR
, "write access "
2130 "unavailable, skipping orphan cleanup");
2134 /* Check if feature set would not allow a r/w mount */
2135 if (!ext4_feature_set_ok(sb
, 0)) {
2136 ext4_msg(sb
, KERN_INFO
, "Skipping orphan cleanup due to "
2137 "unknown ROCOMPAT features");
2141 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2142 /* don't clear list on RO mount w/ errors */
2143 if (es
->s_last_orphan
&& !(s_flags
& MS_RDONLY
)) {
2144 jbd_debug(1, "Errors on filesystem, "
2145 "clearing orphan list.\n");
2146 es
->s_last_orphan
= 0;
2148 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2152 if (s_flags
& MS_RDONLY
) {
2153 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
2154 sb
->s_flags
&= ~MS_RDONLY
;
2157 /* Needed for iput() to work correctly and not trash data */
2158 sb
->s_flags
|= MS_ACTIVE
;
2159 /* Turn on quotas so that they are updated correctly */
2160 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2161 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
2162 int ret
= ext4_quota_on_mount(sb
, i
);
2164 ext4_msg(sb
, KERN_ERR
,
2165 "Cannot turn on journaled "
2166 "quota: error %d", ret
);
2171 while (es
->s_last_orphan
) {
2172 struct inode
*inode
;
2174 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
2175 if (IS_ERR(inode
)) {
2176 es
->s_last_orphan
= 0;
2180 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
2181 dquot_initialize(inode
);
2182 if (inode
->i_nlink
) {
2183 if (test_opt(sb
, DEBUG
))
2184 ext4_msg(sb
, KERN_DEBUG
,
2185 "%s: truncating inode %lu to %lld bytes",
2186 __func__
, inode
->i_ino
, inode
->i_size
);
2187 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2188 inode
->i_ino
, inode
->i_size
);
2189 mutex_lock(&inode
->i_mutex
);
2190 truncate_inode_pages(inode
->i_mapping
, inode
->i_size
);
2191 ext4_truncate(inode
);
2192 mutex_unlock(&inode
->i_mutex
);
2195 if (test_opt(sb
, DEBUG
))
2196 ext4_msg(sb
, KERN_DEBUG
,
2197 "%s: deleting unreferenced inode %lu",
2198 __func__
, inode
->i_ino
);
2199 jbd_debug(2, "deleting unreferenced inode %lu\n",
2203 iput(inode
); /* The delete magic happens here! */
2206 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2209 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
2210 PLURAL(nr_orphans
));
2212 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
2213 PLURAL(nr_truncates
));
2215 /* Turn quotas off */
2216 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2217 if (sb_dqopt(sb
)->files
[i
])
2218 dquot_quota_off(sb
, i
);
2221 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
2225 * Maximal extent format file size.
2226 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2227 * extent format containers, within a sector_t, and within i_blocks
2228 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2229 * so that won't be a limiting factor.
2231 * However there is other limiting factor. We do store extents in the form
2232 * of starting block and length, hence the resulting length of the extent
2233 * covering maximum file size must fit into on-disk format containers as
2234 * well. Given that length is always by 1 unit bigger than max unit (because
2235 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2237 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2239 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
2242 loff_t upper_limit
= MAX_LFS_FILESIZE
;
2244 /* small i_blocks in vfs inode? */
2245 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2247 * CONFIG_LBDAF is not enabled implies the inode
2248 * i_block represent total blocks in 512 bytes
2249 * 32 == size of vfs inode i_blocks * 8
2251 upper_limit
= (1LL << 32) - 1;
2253 /* total blocks in file system block size */
2254 upper_limit
>>= (blkbits
- 9);
2255 upper_limit
<<= blkbits
;
2259 * 32-bit extent-start container, ee_block. We lower the maxbytes
2260 * by one fs block, so ee_len can cover the extent of maximum file
2263 res
= (1LL << 32) - 1;
2266 /* Sanity check against vm- & vfs- imposed limits */
2267 if (res
> upper_limit
)
2274 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2275 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2276 * We need to be 1 filesystem block less than the 2^48 sector limit.
2278 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2280 loff_t res
= EXT4_NDIR_BLOCKS
;
2283 /* This is calculated to be the largest file size for a dense, block
2284 * mapped file such that the file's total number of 512-byte sectors,
2285 * including data and all indirect blocks, does not exceed (2^48 - 1).
2287 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2288 * number of 512-byte sectors of the file.
2291 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2293 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2294 * the inode i_block field represents total file blocks in
2295 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2297 upper_limit
= (1LL << 32) - 1;
2299 /* total blocks in file system block size */
2300 upper_limit
>>= (bits
- 9);
2304 * We use 48 bit ext4_inode i_blocks
2305 * With EXT4_HUGE_FILE_FL set the i_blocks
2306 * represent total number of blocks in
2307 * file system block size
2309 upper_limit
= (1LL << 48) - 1;
2313 /* indirect blocks */
2315 /* double indirect blocks */
2316 meta_blocks
+= 1 + (1LL << (bits
-2));
2317 /* tripple indirect blocks */
2318 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2320 upper_limit
-= meta_blocks
;
2321 upper_limit
<<= bits
;
2323 res
+= 1LL << (bits
-2);
2324 res
+= 1LL << (2*(bits
-2));
2325 res
+= 1LL << (3*(bits
-2));
2327 if (res
> upper_limit
)
2330 if (res
> MAX_LFS_FILESIZE
)
2331 res
= MAX_LFS_FILESIZE
;
2336 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2337 ext4_fsblk_t logical_sb_block
, int nr
)
2339 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2340 ext4_group_t bg
, first_meta_bg
;
2343 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2345 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
2347 return logical_sb_block
+ nr
+ 1;
2348 bg
= sbi
->s_desc_per_block
* nr
;
2349 if (ext4_bg_has_super(sb
, bg
))
2352 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2356 * ext4_get_stripe_size: Get the stripe size.
2357 * @sbi: In memory super block info
2359 * If we have specified it via mount option, then
2360 * use the mount option value. If the value specified at mount time is
2361 * greater than the blocks per group use the super block value.
2362 * If the super block value is greater than blocks per group return 0.
2363 * Allocator needs it be less than blocks per group.
2366 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2368 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2369 unsigned long stripe_width
=
2370 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2373 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2374 ret
= sbi
->s_stripe
;
2375 else if (stripe_width
<= sbi
->s_blocks_per_group
)
2377 else if (stride
<= sbi
->s_blocks_per_group
)
2383 * If the stripe width is 1, this makes no sense and
2384 * we set it to 0 to turn off stripe handling code.
2395 struct attribute attr
;
2396 ssize_t (*show
)(struct ext4_attr
*, struct ext4_sb_info
*, char *);
2397 ssize_t (*store
)(struct ext4_attr
*, struct ext4_sb_info
*,
2398 const char *, size_t);
2405 static int parse_strtoull(const char *buf
,
2406 unsigned long long max
, unsigned long long *value
)
2410 ret
= kstrtoull(skip_spaces(buf
), 0, value
);
2411 if (!ret
&& *value
> max
)
2416 static ssize_t
delayed_allocation_blocks_show(struct ext4_attr
*a
,
2417 struct ext4_sb_info
*sbi
,
2420 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2422 percpu_counter_sum(&sbi
->s_dirtyclusters_counter
)));
2425 static ssize_t
session_write_kbytes_show(struct ext4_attr
*a
,
2426 struct ext4_sb_info
*sbi
, char *buf
)
2428 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2430 if (!sb
->s_bdev
->bd_part
)
2431 return snprintf(buf
, PAGE_SIZE
, "0\n");
2432 return snprintf(buf
, PAGE_SIZE
, "%lu\n",
2433 (part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2434 sbi
->s_sectors_written_start
) >> 1);
2437 static ssize_t
lifetime_write_kbytes_show(struct ext4_attr
*a
,
2438 struct ext4_sb_info
*sbi
, char *buf
)
2440 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2442 if (!sb
->s_bdev
->bd_part
)
2443 return snprintf(buf
, PAGE_SIZE
, "0\n");
2444 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2445 (unsigned long long)(sbi
->s_kbytes_written
+
2446 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2447 EXT4_SB(sb
)->s_sectors_written_start
) >> 1)));
2450 static ssize_t
inode_readahead_blks_store(struct ext4_attr
*a
,
2451 struct ext4_sb_info
*sbi
,
2452 const char *buf
, size_t count
)
2457 ret
= kstrtoul(skip_spaces(buf
), 0, &t
);
2461 if (t
&& (!is_power_of_2(t
) || t
> 0x40000000))
2464 sbi
->s_inode_readahead_blks
= t
;
2468 static ssize_t
sbi_ui_show(struct ext4_attr
*a
,
2469 struct ext4_sb_info
*sbi
, char *buf
)
2471 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->u
.offset
);
2473 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
2476 static ssize_t
sbi_ui_store(struct ext4_attr
*a
,
2477 struct ext4_sb_info
*sbi
,
2478 const char *buf
, size_t count
)
2480 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->u
.offset
);
2484 ret
= kstrtoul(skip_spaces(buf
), 0, &t
);
2491 static ssize_t
reserved_clusters_show(struct ext4_attr
*a
,
2492 struct ext4_sb_info
*sbi
, char *buf
)
2494 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2495 (unsigned long long) atomic64_read(&sbi
->s_resv_clusters
));
2498 static ssize_t
reserved_clusters_store(struct ext4_attr
*a
,
2499 struct ext4_sb_info
*sbi
,
2500 const char *buf
, size_t count
)
2502 unsigned long long val
;
2505 if (parse_strtoull(buf
, -1ULL, &val
))
2507 ret
= ext4_reserve_clusters(sbi
, val
);
2509 return ret
? ret
: count
;
2512 static ssize_t
trigger_test_error(struct ext4_attr
*a
,
2513 struct ext4_sb_info
*sbi
,
2514 const char *buf
, size_t count
)
2518 if (!capable(CAP_SYS_ADMIN
))
2521 if (len
&& buf
[len
-1] == '\n')
2525 ext4_error(sbi
->s_sb
, "%.*s", len
, buf
);
2529 static ssize_t
sbi_deprecated_show(struct ext4_attr
*a
,
2530 struct ext4_sb_info
*sbi
, char *buf
)
2532 return snprintf(buf
, PAGE_SIZE
, "%d\n", a
->u
.deprecated_val
);
2535 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2536 static struct ext4_attr ext4_attr_##_name = { \
2537 .attr = {.name = __stringify(_name), .mode = _mode }, \
2541 .offset = offsetof(struct ext4_sb_info, _elname),\
2544 #define EXT4_ATTR(name, mode, show, store) \
2545 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2547 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2548 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2549 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2550 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2551 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2552 #define ATTR_LIST(name) &ext4_attr_##name.attr
2553 #define EXT4_DEPRECATED_ATTR(_name, _val) \
2554 static struct ext4_attr ext4_attr_##_name = { \
2555 .attr = {.name = __stringify(_name), .mode = 0444 }, \
2556 .show = sbi_deprecated_show, \
2558 .deprecated_val = _val, \
2562 EXT4_RO_ATTR(delayed_allocation_blocks
);
2563 EXT4_RO_ATTR(session_write_kbytes
);
2564 EXT4_RO_ATTR(lifetime_write_kbytes
);
2565 EXT4_RW_ATTR(reserved_clusters
);
2566 EXT4_ATTR_OFFSET(inode_readahead_blks
, 0644, sbi_ui_show
,
2567 inode_readahead_blks_store
, s_inode_readahead_blks
);
2568 EXT4_RW_ATTR_SBI_UI(inode_goal
, s_inode_goal
);
2569 EXT4_RW_ATTR_SBI_UI(mb_stats
, s_mb_stats
);
2570 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan
, s_mb_max_to_scan
);
2571 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan
, s_mb_min_to_scan
);
2572 EXT4_RW_ATTR_SBI_UI(mb_order2_req
, s_mb_order2_reqs
);
2573 EXT4_RW_ATTR_SBI_UI(mb_stream_req
, s_mb_stream_request
);
2574 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc
, s_mb_group_prealloc
);
2575 EXT4_DEPRECATED_ATTR(max_writeback_mb_bump
, 128);
2576 EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb
, s_extent_max_zeroout_kb
);
2577 EXT4_ATTR(trigger_fs_error
, 0200, NULL
, trigger_test_error
);
2579 static struct attribute
*ext4_attrs
[] = {
2580 ATTR_LIST(delayed_allocation_blocks
),
2581 ATTR_LIST(session_write_kbytes
),
2582 ATTR_LIST(lifetime_write_kbytes
),
2583 ATTR_LIST(reserved_clusters
),
2584 ATTR_LIST(inode_readahead_blks
),
2585 ATTR_LIST(inode_goal
),
2586 ATTR_LIST(mb_stats
),
2587 ATTR_LIST(mb_max_to_scan
),
2588 ATTR_LIST(mb_min_to_scan
),
2589 ATTR_LIST(mb_order2_req
),
2590 ATTR_LIST(mb_stream_req
),
2591 ATTR_LIST(mb_group_prealloc
),
2592 ATTR_LIST(max_writeback_mb_bump
),
2593 ATTR_LIST(extent_max_zeroout_kb
),
2594 ATTR_LIST(trigger_fs_error
),
2598 /* Features this copy of ext4 supports */
2599 EXT4_INFO_ATTR(lazy_itable_init
);
2600 EXT4_INFO_ATTR(batched_discard
);
2601 EXT4_INFO_ATTR(meta_bg_resize
);
2603 static struct attribute
*ext4_feat_attrs
[] = {
2604 ATTR_LIST(lazy_itable_init
),
2605 ATTR_LIST(batched_discard
),
2606 ATTR_LIST(meta_bg_resize
),
2610 static ssize_t
ext4_attr_show(struct kobject
*kobj
,
2611 struct attribute
*attr
, char *buf
)
2613 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2615 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2617 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
2620 static ssize_t
ext4_attr_store(struct kobject
*kobj
,
2621 struct attribute
*attr
,
2622 const char *buf
, size_t len
)
2624 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2626 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2628 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
2631 static void ext4_sb_release(struct kobject
*kobj
)
2633 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2635 complete(&sbi
->s_kobj_unregister
);
2638 static const struct sysfs_ops ext4_attr_ops
= {
2639 .show
= ext4_attr_show
,
2640 .store
= ext4_attr_store
,
2643 static struct kobj_type ext4_ktype
= {
2644 .default_attrs
= ext4_attrs
,
2645 .sysfs_ops
= &ext4_attr_ops
,
2646 .release
= ext4_sb_release
,
2649 static void ext4_feat_release(struct kobject
*kobj
)
2651 complete(&ext4_feat
->f_kobj_unregister
);
2654 static struct kobj_type ext4_feat_ktype
= {
2655 .default_attrs
= ext4_feat_attrs
,
2656 .sysfs_ops
= &ext4_attr_ops
,
2657 .release
= ext4_feat_release
,
2661 * Check whether this filesystem can be mounted based on
2662 * the features present and the RDONLY/RDWR mount requested.
2663 * Returns 1 if this filesystem can be mounted as requested,
2664 * 0 if it cannot be.
2666 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2668 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
)) {
2669 ext4_msg(sb
, KERN_ERR
,
2670 "Couldn't mount because of "
2671 "unsupported optional features (%x)",
2672 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2673 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2680 /* Check that feature set is OK for a read-write mount */
2681 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
)) {
2682 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2683 "unsupported optional features (%x)",
2684 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2685 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2689 * Large file size enabled file system can only be mounted
2690 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2692 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
2693 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2694 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2695 "cannot be mounted RDWR without "
2700 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_BIGALLOC
) &&
2701 !EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_EXTENTS
)) {
2702 ext4_msg(sb
, KERN_ERR
,
2703 "Can't support bigalloc feature without "
2704 "extents feature\n");
2708 #ifndef CONFIG_QUOTA
2709 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
) &&
2711 ext4_msg(sb
, KERN_ERR
,
2712 "Filesystem with quota feature cannot be mounted RDWR "
2713 "without CONFIG_QUOTA");
2716 #endif /* CONFIG_QUOTA */
2721 * This function is called once a day if we have errors logged
2722 * on the file system
2724 static void print_daily_error_info(unsigned long arg
)
2726 struct super_block
*sb
= (struct super_block
*) arg
;
2727 struct ext4_sb_info
*sbi
;
2728 struct ext4_super_block
*es
;
2733 if (es
->s_error_count
)
2734 ext4_msg(sb
, KERN_NOTICE
, "error count: %u",
2735 le32_to_cpu(es
->s_error_count
));
2736 if (es
->s_first_error_time
) {
2737 printk(KERN_NOTICE
"EXT4-fs (%s): initial error at %u: %.*s:%d",
2738 sb
->s_id
, le32_to_cpu(es
->s_first_error_time
),
2739 (int) sizeof(es
->s_first_error_func
),
2740 es
->s_first_error_func
,
2741 le32_to_cpu(es
->s_first_error_line
));
2742 if (es
->s_first_error_ino
)
2743 printk(": inode %u",
2744 le32_to_cpu(es
->s_first_error_ino
));
2745 if (es
->s_first_error_block
)
2746 printk(": block %llu", (unsigned long long)
2747 le64_to_cpu(es
->s_first_error_block
));
2750 if (es
->s_last_error_time
) {
2751 printk(KERN_NOTICE
"EXT4-fs (%s): last error at %u: %.*s:%d",
2752 sb
->s_id
, le32_to_cpu(es
->s_last_error_time
),
2753 (int) sizeof(es
->s_last_error_func
),
2754 es
->s_last_error_func
,
2755 le32_to_cpu(es
->s_last_error_line
));
2756 if (es
->s_last_error_ino
)
2757 printk(": inode %u",
2758 le32_to_cpu(es
->s_last_error_ino
));
2759 if (es
->s_last_error_block
)
2760 printk(": block %llu", (unsigned long long)
2761 le64_to_cpu(es
->s_last_error_block
));
2764 mod_timer(&sbi
->s_err_report
, jiffies
+ 24*60*60*HZ
); /* Once a day */
2767 /* Find next suitable group and run ext4_init_inode_table */
2768 static int ext4_run_li_request(struct ext4_li_request
*elr
)
2770 struct ext4_group_desc
*gdp
= NULL
;
2771 ext4_group_t group
, ngroups
;
2772 struct super_block
*sb
;
2773 unsigned long timeout
= 0;
2777 ngroups
= EXT4_SB(sb
)->s_groups_count
;
2780 for (group
= elr
->lr_next_group
; group
< ngroups
; group
++) {
2781 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2787 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2791 if (group
>= ngroups
)
2796 ret
= ext4_init_inode_table(sb
, group
,
2797 elr
->lr_timeout
? 0 : 1);
2798 if (elr
->lr_timeout
== 0) {
2799 timeout
= (jiffies
- timeout
) *
2800 elr
->lr_sbi
->s_li_wait_mult
;
2801 elr
->lr_timeout
= timeout
;
2803 elr
->lr_next_sched
= jiffies
+ elr
->lr_timeout
;
2804 elr
->lr_next_group
= group
+ 1;
2812 * Remove lr_request from the list_request and free the
2813 * request structure. Should be called with li_list_mtx held
2815 static void ext4_remove_li_request(struct ext4_li_request
*elr
)
2817 struct ext4_sb_info
*sbi
;
2824 list_del(&elr
->lr_request
);
2825 sbi
->s_li_request
= NULL
;
2829 static void ext4_unregister_li_request(struct super_block
*sb
)
2831 mutex_lock(&ext4_li_mtx
);
2832 if (!ext4_li_info
) {
2833 mutex_unlock(&ext4_li_mtx
);
2837 mutex_lock(&ext4_li_info
->li_list_mtx
);
2838 ext4_remove_li_request(EXT4_SB(sb
)->s_li_request
);
2839 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2840 mutex_unlock(&ext4_li_mtx
);
2843 static struct task_struct
*ext4_lazyinit_task
;
2846 * This is the function where ext4lazyinit thread lives. It walks
2847 * through the request list searching for next scheduled filesystem.
2848 * When such a fs is found, run the lazy initialization request
2849 * (ext4_rn_li_request) and keep track of the time spend in this
2850 * function. Based on that time we compute next schedule time of
2851 * the request. When walking through the list is complete, compute
2852 * next waking time and put itself into sleep.
2854 static int ext4_lazyinit_thread(void *arg
)
2856 struct ext4_lazy_init
*eli
= (struct ext4_lazy_init
*)arg
;
2857 struct list_head
*pos
, *n
;
2858 struct ext4_li_request
*elr
;
2859 unsigned long next_wakeup
, cur
;
2861 BUG_ON(NULL
== eli
);
2865 next_wakeup
= MAX_JIFFY_OFFSET
;
2867 mutex_lock(&eli
->li_list_mtx
);
2868 if (list_empty(&eli
->li_request_list
)) {
2869 mutex_unlock(&eli
->li_list_mtx
);
2873 list_for_each_safe(pos
, n
, &eli
->li_request_list
) {
2874 elr
= list_entry(pos
, struct ext4_li_request
,
2877 if (time_after_eq(jiffies
, elr
->lr_next_sched
)) {
2878 if (ext4_run_li_request(elr
) != 0) {
2879 /* error, remove the lazy_init job */
2880 ext4_remove_li_request(elr
);
2885 if (time_before(elr
->lr_next_sched
, next_wakeup
))
2886 next_wakeup
= elr
->lr_next_sched
;
2888 mutex_unlock(&eli
->li_list_mtx
);
2893 if ((time_after_eq(cur
, next_wakeup
)) ||
2894 (MAX_JIFFY_OFFSET
== next_wakeup
)) {
2899 schedule_timeout_interruptible(next_wakeup
- cur
);
2901 if (kthread_should_stop()) {
2902 ext4_clear_request_list();
2909 * It looks like the request list is empty, but we need
2910 * to check it under the li_list_mtx lock, to prevent any
2911 * additions into it, and of course we should lock ext4_li_mtx
2912 * to atomically free the list and ext4_li_info, because at
2913 * this point another ext4 filesystem could be registering
2916 mutex_lock(&ext4_li_mtx
);
2917 mutex_lock(&eli
->li_list_mtx
);
2918 if (!list_empty(&eli
->li_request_list
)) {
2919 mutex_unlock(&eli
->li_list_mtx
);
2920 mutex_unlock(&ext4_li_mtx
);
2923 mutex_unlock(&eli
->li_list_mtx
);
2924 kfree(ext4_li_info
);
2925 ext4_li_info
= NULL
;
2926 mutex_unlock(&ext4_li_mtx
);
2931 static void ext4_clear_request_list(void)
2933 struct list_head
*pos
, *n
;
2934 struct ext4_li_request
*elr
;
2936 mutex_lock(&ext4_li_info
->li_list_mtx
);
2937 list_for_each_safe(pos
, n
, &ext4_li_info
->li_request_list
) {
2938 elr
= list_entry(pos
, struct ext4_li_request
,
2940 ext4_remove_li_request(elr
);
2942 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2945 static int ext4_run_lazyinit_thread(void)
2947 ext4_lazyinit_task
= kthread_run(ext4_lazyinit_thread
,
2948 ext4_li_info
, "ext4lazyinit");
2949 if (IS_ERR(ext4_lazyinit_task
)) {
2950 int err
= PTR_ERR(ext4_lazyinit_task
);
2951 ext4_clear_request_list();
2952 kfree(ext4_li_info
);
2953 ext4_li_info
= NULL
;
2954 printk(KERN_CRIT
"EXT4-fs: error %d creating inode table "
2955 "initialization thread\n",
2959 ext4_li_info
->li_state
|= EXT4_LAZYINIT_RUNNING
;
2964 * Check whether it make sense to run itable init. thread or not.
2965 * If there is at least one uninitialized inode table, return
2966 * corresponding group number, else the loop goes through all
2967 * groups and return total number of groups.
2969 static ext4_group_t
ext4_has_uninit_itable(struct super_block
*sb
)
2971 ext4_group_t group
, ngroups
= EXT4_SB(sb
)->s_groups_count
;
2972 struct ext4_group_desc
*gdp
= NULL
;
2974 for (group
= 0; group
< ngroups
; group
++) {
2975 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2979 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2986 static int ext4_li_info_new(void)
2988 struct ext4_lazy_init
*eli
= NULL
;
2990 eli
= kzalloc(sizeof(*eli
), GFP_KERNEL
);
2994 INIT_LIST_HEAD(&eli
->li_request_list
);
2995 mutex_init(&eli
->li_list_mtx
);
2997 eli
->li_state
|= EXT4_LAZYINIT_QUIT
;
3004 static struct ext4_li_request
*ext4_li_request_new(struct super_block
*sb
,
3007 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3008 struct ext4_li_request
*elr
;
3011 elr
= kzalloc(sizeof(*elr
), GFP_KERNEL
);
3017 elr
->lr_next_group
= start
;
3020 * Randomize first schedule time of the request to
3021 * spread the inode table initialization requests
3024 get_random_bytes(&rnd
, sizeof(rnd
));
3025 elr
->lr_next_sched
= jiffies
+ (unsigned long)rnd
%
3026 (EXT4_DEF_LI_MAX_START_DELAY
* HZ
);
3031 int ext4_register_li_request(struct super_block
*sb
,
3032 ext4_group_t first_not_zeroed
)
3034 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3035 struct ext4_li_request
*elr
= NULL
;
3036 ext4_group_t ngroups
= EXT4_SB(sb
)->s_groups_count
;
3039 mutex_lock(&ext4_li_mtx
);
3040 if (sbi
->s_li_request
!= NULL
) {
3042 * Reset timeout so it can be computed again, because
3043 * s_li_wait_mult might have changed.
3045 sbi
->s_li_request
->lr_timeout
= 0;
3049 if (first_not_zeroed
== ngroups
||
3050 (sb
->s_flags
& MS_RDONLY
) ||
3051 !test_opt(sb
, INIT_INODE_TABLE
))
3054 elr
= ext4_li_request_new(sb
, first_not_zeroed
);
3060 if (NULL
== ext4_li_info
) {
3061 ret
= ext4_li_info_new();
3066 mutex_lock(&ext4_li_info
->li_list_mtx
);
3067 list_add(&elr
->lr_request
, &ext4_li_info
->li_request_list
);
3068 mutex_unlock(&ext4_li_info
->li_list_mtx
);
3070 sbi
->s_li_request
= elr
;
3072 * set elr to NULL here since it has been inserted to
3073 * the request_list and the removal and free of it is
3074 * handled by ext4_clear_request_list from now on.
3078 if (!(ext4_li_info
->li_state
& EXT4_LAZYINIT_RUNNING
)) {
3079 ret
= ext4_run_lazyinit_thread();
3084 mutex_unlock(&ext4_li_mtx
);
3091 * We do not need to lock anything since this is called on
3094 static void ext4_destroy_lazyinit_thread(void)
3097 * If thread exited earlier
3098 * there's nothing to be done.
3100 if (!ext4_li_info
|| !ext4_lazyinit_task
)
3103 kthread_stop(ext4_lazyinit_task
);
3106 static int set_journal_csum_feature_set(struct super_block
*sb
)
3109 int compat
, incompat
;
3110 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3112 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3113 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
)) {
3114 /* journal checksum v2 */
3116 incompat
= JBD2_FEATURE_INCOMPAT_CSUM_V2
;
3118 /* journal checksum v1 */
3119 compat
= JBD2_FEATURE_COMPAT_CHECKSUM
;
3123 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
3124 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3126 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
|
3128 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
3129 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3132 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3133 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3135 jbd2_journal_clear_features(sbi
->s_journal
,
3136 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
3137 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
|
3138 JBD2_FEATURE_INCOMPAT_CSUM_V2
);
3145 * Note: calculating the overhead so we can be compatible with
3146 * historical BSD practice is quite difficult in the face of
3147 * clusters/bigalloc. This is because multiple metadata blocks from
3148 * different block group can end up in the same allocation cluster.
3149 * Calculating the exact overhead in the face of clustered allocation
3150 * requires either O(all block bitmaps) in memory or O(number of block
3151 * groups**2) in time. We will still calculate the superblock for
3152 * older file systems --- and if we come across with a bigalloc file
3153 * system with zero in s_overhead_clusters the estimate will be close to
3154 * correct especially for very large cluster sizes --- but for newer
3155 * file systems, it's better to calculate this figure once at mkfs
3156 * time, and store it in the superblock. If the superblock value is
3157 * present (even for non-bigalloc file systems), we will use it.
3159 static int count_overhead(struct super_block
*sb
, ext4_group_t grp
,
3162 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3163 struct ext4_group_desc
*gdp
;
3164 ext4_fsblk_t first_block
, last_block
, b
;
3165 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3166 int s
, j
, count
= 0;
3168 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_BIGALLOC
))
3169 return (ext4_bg_has_super(sb
, grp
) + ext4_bg_num_gdb(sb
, grp
) +
3170 sbi
->s_itb_per_group
+ 2);
3172 first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
) +
3173 (grp
* EXT4_BLOCKS_PER_GROUP(sb
));
3174 last_block
= first_block
+ EXT4_BLOCKS_PER_GROUP(sb
) - 1;
3175 for (i
= 0; i
< ngroups
; i
++) {
3176 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
3177 b
= ext4_block_bitmap(sb
, gdp
);
3178 if (b
>= first_block
&& b
<= last_block
) {
3179 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3182 b
= ext4_inode_bitmap(sb
, gdp
);
3183 if (b
>= first_block
&& b
<= last_block
) {
3184 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3187 b
= ext4_inode_table(sb
, gdp
);
3188 if (b
>= first_block
&& b
+ sbi
->s_itb_per_group
<= last_block
)
3189 for (j
= 0; j
< sbi
->s_itb_per_group
; j
++, b
++) {
3190 int c
= EXT4_B2C(sbi
, b
- first_block
);
3191 ext4_set_bit(c
, buf
);
3197 if (ext4_bg_has_super(sb
, grp
)) {
3198 ext4_set_bit(s
++, buf
);
3201 for (j
= ext4_bg_num_gdb(sb
, grp
); j
> 0; j
--) {
3202 ext4_set_bit(EXT4_B2C(sbi
, s
++), buf
);
3208 return EXT4_CLUSTERS_PER_GROUP(sb
) -
3209 ext4_count_free(buf
, EXT4_CLUSTERS_PER_GROUP(sb
) / 8);
3213 * Compute the overhead and stash it in sbi->s_overhead
3215 int ext4_calculate_overhead(struct super_block
*sb
)
3217 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3218 struct ext4_super_block
*es
= sbi
->s_es
;
3219 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3220 ext4_fsblk_t overhead
= 0;
3221 char *buf
= (char *) get_zeroed_page(GFP_KERNEL
);
3227 * Compute the overhead (FS structures). This is constant
3228 * for a given filesystem unless the number of block groups
3229 * changes so we cache the previous value until it does.
3233 * All of the blocks before first_data_block are overhead
3235 overhead
= EXT4_B2C(sbi
, le32_to_cpu(es
->s_first_data_block
));
3238 * Add the overhead found in each block group
3240 for (i
= 0; i
< ngroups
; i
++) {
3243 blks
= count_overhead(sb
, i
, buf
);
3246 memset(buf
, 0, PAGE_SIZE
);
3249 /* Add the journal blocks as well */
3251 overhead
+= EXT4_NUM_B2C(sbi
, sbi
->s_journal
->j_maxlen
);
3253 sbi
->s_overhead
= overhead
;
3255 free_page((unsigned long) buf
);
3260 static ext4_fsblk_t
ext4_calculate_resv_clusters(struct ext4_sb_info
*sbi
)
3262 ext4_fsblk_t resv_clusters
;
3265 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3266 * This should cover the situations where we can not afford to run
3267 * out of space like for example punch hole, or converting
3268 * uninitialized extents in delalloc path. In most cases such
3269 * allocation would require 1, or 2 blocks, higher numbers are
3272 resv_clusters
= ext4_blocks_count(sbi
->s_es
) >> sbi
->s_cluster_bits
;
3274 do_div(resv_clusters
, 50);
3275 resv_clusters
= min_t(ext4_fsblk_t
, resv_clusters
, 4096);
3277 return resv_clusters
;
3281 static int ext4_reserve_clusters(struct ext4_sb_info
*sbi
, ext4_fsblk_t count
)
3283 ext4_fsblk_t clusters
= ext4_blocks_count(sbi
->s_es
) >>
3284 sbi
->s_cluster_bits
;
3286 if (count
>= clusters
)
3289 atomic64_set(&sbi
->s_resv_clusters
, count
);
3293 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
3295 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
3296 struct buffer_head
*bh
;
3297 struct ext4_super_block
*es
= NULL
;
3298 struct ext4_sb_info
*sbi
;
3300 ext4_fsblk_t sb_block
= get_sb_block(&data
);
3301 ext4_fsblk_t logical_sb_block
;
3302 unsigned long offset
= 0;
3303 unsigned long journal_devnum
= 0;
3304 unsigned long def_mount_opts
;
3309 int blocksize
, clustersize
;
3310 unsigned int db_count
;
3312 int needs_recovery
, has_huge_files
, has_bigalloc
;
3315 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3316 ext4_group_t first_not_zeroed
;
3318 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
3322 sbi
->s_blockgroup_lock
=
3323 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
3324 if (!sbi
->s_blockgroup_lock
) {
3328 sb
->s_fs_info
= sbi
;
3330 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
3331 sbi
->s_sb_block
= sb_block
;
3332 if (sb
->s_bdev
->bd_part
)
3333 sbi
->s_sectors_written_start
=
3334 part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]);
3336 /* Cleanup superblock name */
3337 for (cp
= sb
->s_id
; (cp
= strchr(cp
, '/'));)
3340 /* -EINVAL is default */
3342 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
3344 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
3349 * The ext4 superblock will not be buffer aligned for other than 1kB
3350 * block sizes. We need to calculate the offset from buffer start.
3352 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
3353 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3354 offset
= do_div(logical_sb_block
, blocksize
);
3356 logical_sb_block
= sb_block
;
3359 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
3360 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
3364 * Note: s_es must be initialized as soon as possible because
3365 * some ext4 macro-instructions depend on its value
3367 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
3369 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
3370 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
3372 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
3374 /* Warn if metadata_csum and gdt_csum are both set. */
3375 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3376 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
) &&
3377 EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_GDT_CSUM
))
3378 ext4_warning(sb
, KERN_INFO
"metadata_csum and uninit_bg are "
3379 "redundant flags; please run fsck.");
3381 /* Check for a known checksum algorithm */
3382 if (!ext4_verify_csum_type(sb
, es
)) {
3383 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3384 "unknown checksum algorithm.");
3389 /* Load the checksum driver */
3390 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3391 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
)) {
3392 sbi
->s_chksum_driver
= crypto_alloc_shash("crc32c", 0, 0);
3393 if (IS_ERR(sbi
->s_chksum_driver
)) {
3394 ext4_msg(sb
, KERN_ERR
, "Cannot load crc32c driver.");
3395 ret
= PTR_ERR(sbi
->s_chksum_driver
);
3396 sbi
->s_chksum_driver
= NULL
;
3401 /* Check superblock checksum */
3402 if (!ext4_superblock_csum_verify(sb
, es
)) {
3403 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3404 "invalid superblock checksum. Run e2fsck?");
3409 /* Precompute checksum seed for all metadata */
3410 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3411 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))
3412 sbi
->s_csum_seed
= ext4_chksum(sbi
, ~0, es
->s_uuid
,
3413 sizeof(es
->s_uuid
));
3415 /* Set defaults before we parse the mount options */
3416 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
3417 set_opt(sb
, INIT_INODE_TABLE
);
3418 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
3420 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
3422 if (def_mount_opts
& EXT4_DEFM_UID16
)
3423 set_opt(sb
, NO_UID32
);
3424 /* xattr user namespace & acls are now defaulted on */
3425 set_opt(sb
, XATTR_USER
);
3426 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3427 set_opt(sb
, POSIX_ACL
);
3429 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
3430 set_opt(sb
, JOURNAL_DATA
);
3431 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
3432 set_opt(sb
, ORDERED_DATA
);
3433 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
3434 set_opt(sb
, WRITEBACK_DATA
);
3436 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
3437 set_opt(sb
, ERRORS_PANIC
);
3438 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
3439 set_opt(sb
, ERRORS_CONT
);
3441 set_opt(sb
, ERRORS_RO
);
3442 if (def_mount_opts
& EXT4_DEFM_BLOCK_VALIDITY
)
3443 set_opt(sb
, BLOCK_VALIDITY
);
3444 if (def_mount_opts
& EXT4_DEFM_DISCARD
)
3445 set_opt(sb
, DISCARD
);
3447 sbi
->s_resuid
= make_kuid(&init_user_ns
, le16_to_cpu(es
->s_def_resuid
));
3448 sbi
->s_resgid
= make_kgid(&init_user_ns
, le16_to_cpu(es
->s_def_resgid
));
3449 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
3450 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
3451 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
3453 if ((def_mount_opts
& EXT4_DEFM_NOBARRIER
) == 0)
3454 set_opt(sb
, BARRIER
);
3457 * enable delayed allocation by default
3458 * Use -o nodelalloc to turn it off
3460 if (!IS_EXT3_SB(sb
) && !IS_EXT2_SB(sb
) &&
3461 ((def_mount_opts
& EXT4_DEFM_NODELALLOC
) == 0))
3462 set_opt(sb
, DELALLOC
);
3465 * set default s_li_wait_mult for lazyinit, for the case there is
3466 * no mount option specified.
3468 sbi
->s_li_wait_mult
= EXT4_DEF_LI_WAIT_MULT
;
3470 if (!parse_options((char *) sbi
->s_es
->s_mount_opts
, sb
,
3471 &journal_devnum
, &journal_ioprio
, 0)) {
3472 ext4_msg(sb
, KERN_WARNING
,
3473 "failed to parse options in superblock: %s",
3474 sbi
->s_es
->s_mount_opts
);
3476 sbi
->s_def_mount_opt
= sbi
->s_mount_opt
;
3477 if (!parse_options((char *) data
, sb
, &journal_devnum
,
3478 &journal_ioprio
, 0))
3481 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
3482 printk_once(KERN_WARNING
"EXT4-fs: Warning: mounting "
3483 "with data=journal disables delayed "
3484 "allocation and O_DIRECT support!\n");
3485 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
3486 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3487 "both data=journal and delalloc");
3490 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
3491 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3492 "both data=journal and delalloc");
3495 if (test_opt(sb
, DELALLOC
))
3496 clear_opt(sb
, DELALLOC
);
3499 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3500 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
3502 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
3503 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
3504 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
3505 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
3506 ext4_msg(sb
, KERN_WARNING
,
3507 "feature flags set on rev 0 fs, "
3508 "running e2fsck is recommended");
3510 if (IS_EXT2_SB(sb
)) {
3511 if (ext2_feature_set_ok(sb
))
3512 ext4_msg(sb
, KERN_INFO
, "mounting ext2 file system "
3513 "using the ext4 subsystem");
3515 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext2 due "
3516 "to feature incompatibilities");
3521 if (IS_EXT3_SB(sb
)) {
3522 if (ext3_feature_set_ok(sb
))
3523 ext4_msg(sb
, KERN_INFO
, "mounting ext3 file system "
3524 "using the ext4 subsystem");
3526 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext3 due "
3527 "to feature incompatibilities");
3533 * Check feature flags regardless of the revision level, since we
3534 * previously didn't change the revision level when setting the flags,
3535 * so there is a chance incompat flags are set on a rev 0 filesystem.
3537 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
3540 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
3541 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
3542 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
3543 ext4_msg(sb
, KERN_ERR
,
3544 "Unsupported filesystem blocksize %d", blocksize
);
3548 if (sb
->s_blocksize
!= blocksize
) {
3549 /* Validate the filesystem blocksize */
3550 if (!sb_set_blocksize(sb
, blocksize
)) {
3551 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
3557 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3558 offset
= do_div(logical_sb_block
, blocksize
);
3559 bh
= sb_bread(sb
, logical_sb_block
);
3561 ext4_msg(sb
, KERN_ERR
,
3562 "Can't read superblock on 2nd try");
3565 es
= (struct ext4_super_block
*)(bh
->b_data
+ offset
);
3567 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
3568 ext4_msg(sb
, KERN_ERR
,
3569 "Magic mismatch, very weird!");
3574 has_huge_files
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3575 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
);
3576 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
3578 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
3580 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
3581 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
3582 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
3584 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
3585 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
3586 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
3587 (!is_power_of_2(sbi
->s_inode_size
)) ||
3588 (sbi
->s_inode_size
> blocksize
)) {
3589 ext4_msg(sb
, KERN_ERR
,
3590 "unsupported inode size: %d",
3594 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
3595 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
3598 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
3599 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
3600 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
3601 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
3602 !is_power_of_2(sbi
->s_desc_size
)) {
3603 ext4_msg(sb
, KERN_ERR
,
3604 "unsupported descriptor size %lu",
3609 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
3611 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
3612 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
3613 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
3616 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
3617 if (sbi
->s_inodes_per_block
== 0)
3619 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
3620 sbi
->s_inodes_per_block
;
3621 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
3623 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3624 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
3625 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
3627 /* Do we have standard group size of blocksize * 8 blocks ? */
3628 if (sbi
->s_blocks_per_group
== blocksize
<< 3)
3629 set_opt2(sb
, STD_GROUP_SIZE
);
3631 for (i
= 0; i
< 4; i
++)
3632 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
3633 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
3634 i
= le32_to_cpu(es
->s_flags
);
3635 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
3636 sbi
->s_hash_unsigned
= 3;
3637 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
3638 #ifdef __CHAR_UNSIGNED__
3639 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
3640 sbi
->s_hash_unsigned
= 3;
3642 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
3646 /* Handle clustersize */
3647 clustersize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_cluster_size
);
3648 has_bigalloc
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3649 EXT4_FEATURE_RO_COMPAT_BIGALLOC
);
3651 if (clustersize
< blocksize
) {
3652 ext4_msg(sb
, KERN_ERR
,
3653 "cluster size (%d) smaller than "
3654 "block size (%d)", clustersize
, blocksize
);
3657 sbi
->s_cluster_bits
= le32_to_cpu(es
->s_log_cluster_size
) -
3658 le32_to_cpu(es
->s_log_block_size
);
3659 sbi
->s_clusters_per_group
=
3660 le32_to_cpu(es
->s_clusters_per_group
);
3661 if (sbi
->s_clusters_per_group
> blocksize
* 8) {
3662 ext4_msg(sb
, KERN_ERR
,
3663 "#clusters per group too big: %lu",
3664 sbi
->s_clusters_per_group
);
3667 if (sbi
->s_blocks_per_group
!=
3668 (sbi
->s_clusters_per_group
* (clustersize
/ blocksize
))) {
3669 ext4_msg(sb
, KERN_ERR
, "blocks per group (%lu) and "
3670 "clusters per group (%lu) inconsistent",
3671 sbi
->s_blocks_per_group
,
3672 sbi
->s_clusters_per_group
);
3676 if (clustersize
!= blocksize
) {
3677 ext4_warning(sb
, "fragment/cluster size (%d) != "
3678 "block size (%d)", clustersize
,
3680 clustersize
= blocksize
;
3682 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
3683 ext4_msg(sb
, KERN_ERR
,
3684 "#blocks per group too big: %lu",
3685 sbi
->s_blocks_per_group
);
3688 sbi
->s_clusters_per_group
= sbi
->s_blocks_per_group
;
3689 sbi
->s_cluster_bits
= 0;
3691 sbi
->s_cluster_ratio
= clustersize
/ blocksize
;
3693 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
3694 ext4_msg(sb
, KERN_ERR
,
3695 "#inodes per group too big: %lu",
3696 sbi
->s_inodes_per_group
);
3701 * Test whether we have more sectors than will fit in sector_t,
3702 * and whether the max offset is addressable by the page cache.
3704 err
= generic_check_addressable(sb
->s_blocksize_bits
,
3705 ext4_blocks_count(es
));
3707 ext4_msg(sb
, KERN_ERR
, "filesystem"
3708 " too large to mount safely on this system");
3709 if (sizeof(sector_t
) < 8)
3710 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
3714 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
3717 /* check blocks count against device size */
3718 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
3719 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
3720 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
3721 "exceeds size of device (%llu blocks)",
3722 ext4_blocks_count(es
), blocks_count
);
3727 * It makes no sense for the first data block to be beyond the end
3728 * of the filesystem.
3730 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
3731 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data "
3732 "block %u is beyond end of filesystem (%llu)",
3733 le32_to_cpu(es
->s_first_data_block
),
3734 ext4_blocks_count(es
));
3737 blocks_count
= (ext4_blocks_count(es
) -
3738 le32_to_cpu(es
->s_first_data_block
) +
3739 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
3740 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
3741 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
3742 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
3743 "(block count %llu, first data block %u, "
3744 "blocks per group %lu)", sbi
->s_groups_count
,
3745 ext4_blocks_count(es
),
3746 le32_to_cpu(es
->s_first_data_block
),
3747 EXT4_BLOCKS_PER_GROUP(sb
));
3750 sbi
->s_groups_count
= blocks_count
;
3751 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
3752 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
3753 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
3754 EXT4_DESC_PER_BLOCK(sb
);
3755 sbi
->s_group_desc
= ext4_kvmalloc(db_count
*
3756 sizeof(struct buffer_head
*),
3758 if (sbi
->s_group_desc
== NULL
) {
3759 ext4_msg(sb
, KERN_ERR
, "not enough memory");
3765 sbi
->s_proc
= proc_mkdir(sb
->s_id
, ext4_proc_root
);
3768 proc_create_data("options", S_IRUGO
, sbi
->s_proc
,
3769 &ext4_seq_options_fops
, sb
);
3771 bgl_lock_init(sbi
->s_blockgroup_lock
);
3773 for (i
= 0; i
< db_count
; i
++) {
3774 block
= descriptor_loc(sb
, logical_sb_block
, i
);
3775 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
3776 if (!sbi
->s_group_desc
[i
]) {
3777 ext4_msg(sb
, KERN_ERR
,
3778 "can't read group descriptor %d", i
);
3783 if (!ext4_check_descriptors(sb
, &first_not_zeroed
)) {
3784 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
3787 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
3788 if (!ext4_fill_flex_info(sb
)) {
3789 ext4_msg(sb
, KERN_ERR
,
3790 "unable to initialize "
3791 "flex_bg meta info!");
3795 sbi
->s_gdb_count
= db_count
;
3796 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
3797 spin_lock_init(&sbi
->s_next_gen_lock
);
3799 init_timer(&sbi
->s_err_report
);
3800 sbi
->s_err_report
.function
= print_daily_error_info
;
3801 sbi
->s_err_report
.data
= (unsigned long) sb
;
3803 /* Register extent status tree shrinker */
3804 ext4_es_register_shrinker(sbi
);
3806 err
= percpu_counter_init(&sbi
->s_freeclusters_counter
,
3807 ext4_count_free_clusters(sb
));
3809 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
3810 ext4_count_free_inodes(sb
));
3813 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
3814 ext4_count_dirs(sb
));
3817 err
= percpu_counter_init(&sbi
->s_dirtyclusters_counter
, 0);
3820 err
= percpu_counter_init(&sbi
->s_extent_cache_cnt
, 0);
3823 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
3827 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
3828 sbi
->s_extent_max_zeroout_kb
= 32;
3831 * set up enough so that it can read an inode
3833 if (!test_opt(sb
, NOLOAD
) &&
3834 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
3835 sb
->s_op
= &ext4_sops
;
3837 sb
->s_op
= &ext4_nojournal_sops
;
3838 sb
->s_export_op
= &ext4_export_ops
;
3839 sb
->s_xattr
= ext4_xattr_handlers
;
3841 sb
->dq_op
= &ext4_quota_operations
;
3842 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
))
3843 sb
->s_qcop
= &ext4_qctl_sysfile_operations
;
3845 sb
->s_qcop
= &ext4_qctl_operations
;
3847 memcpy(sb
->s_uuid
, es
->s_uuid
, sizeof(es
->s_uuid
));
3849 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
3850 mutex_init(&sbi
->s_orphan_lock
);
3854 needs_recovery
= (es
->s_last_orphan
!= 0 ||
3855 EXT4_HAS_INCOMPAT_FEATURE(sb
,
3856 EXT4_FEATURE_INCOMPAT_RECOVER
));
3858 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_MMP
) &&
3859 !(sb
->s_flags
& MS_RDONLY
))
3860 if (ext4_multi_mount_protect(sb
, le64_to_cpu(es
->s_mmp_block
)))
3864 * The first inode we look at is the journal inode. Don't try
3865 * root first: it may be modified in the journal!
3867 if (!test_opt(sb
, NOLOAD
) &&
3868 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
3869 if (ext4_load_journal(sb
, es
, journal_devnum
))
3871 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
3872 EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3873 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
3874 "suppressed and not mounted read-only");
3875 goto failed_mount_wq
;
3877 clear_opt(sb
, DATA_FLAGS
);
3878 sbi
->s_journal
= NULL
;
3883 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
) &&
3884 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
3885 JBD2_FEATURE_INCOMPAT_64BIT
)) {
3886 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
3887 goto failed_mount_wq
;
3890 if (!set_journal_csum_feature_set(sb
)) {
3891 ext4_msg(sb
, KERN_ERR
, "Failed to set journal checksum "
3893 goto failed_mount_wq
;
3896 /* We have now updated the journal if required, so we can
3897 * validate the data journaling mode. */
3898 switch (test_opt(sb
, DATA_FLAGS
)) {
3900 /* No mode set, assume a default based on the journal
3901 * capabilities: ORDERED_DATA if the journal can
3902 * cope, else JOURNAL_DATA
3904 if (jbd2_journal_check_available_features
3905 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
3906 set_opt(sb
, ORDERED_DATA
);
3908 set_opt(sb
, JOURNAL_DATA
);
3911 case EXT4_MOUNT_ORDERED_DATA
:
3912 case EXT4_MOUNT_WRITEBACK_DATA
:
3913 if (!jbd2_journal_check_available_features
3914 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
3915 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
3916 "requested data journaling mode");
3917 goto failed_mount_wq
;
3922 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
3924 sbi
->s_journal
->j_commit_callback
= ext4_journal_commit_callback
;
3927 * The journal may have updated the bg summary counts, so we
3928 * need to update the global counters.
3930 percpu_counter_set(&sbi
->s_freeclusters_counter
,
3931 ext4_count_free_clusters(sb
));
3932 percpu_counter_set(&sbi
->s_freeinodes_counter
,
3933 ext4_count_free_inodes(sb
));
3934 percpu_counter_set(&sbi
->s_dirs_counter
,
3935 ext4_count_dirs(sb
));
3936 percpu_counter_set(&sbi
->s_dirtyclusters_counter
, 0);
3940 * Get the # of file system overhead blocks from the
3941 * superblock if present.
3943 if (es
->s_overhead_clusters
)
3944 sbi
->s_overhead
= le32_to_cpu(es
->s_overhead_clusters
);
3946 err
= ext4_calculate_overhead(sb
);
3948 goto failed_mount_wq
;
3952 * The maximum number of concurrent works can be high and
3953 * concurrency isn't really necessary. Limit it to 1.
3955 EXT4_SB(sb
)->rsv_conversion_wq
=
3956 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM
| WQ_UNBOUND
, 1);
3957 if (!EXT4_SB(sb
)->rsv_conversion_wq
) {
3958 printk(KERN_ERR
"EXT4-fs: failed to create workqueue\n");
3963 EXT4_SB(sb
)->unrsv_conversion_wq
=
3964 alloc_workqueue("ext4-unrsv-conversion", WQ_MEM_RECLAIM
| WQ_UNBOUND
, 1);
3965 if (!EXT4_SB(sb
)->unrsv_conversion_wq
) {
3966 printk(KERN_ERR
"EXT4-fs: failed to create workqueue\n");
3972 * The jbd2_journal_load will have done any necessary log recovery,
3973 * so we can safely mount the rest of the filesystem now.
3976 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
3978 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
3979 ret
= PTR_ERR(root
);
3983 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
3984 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
3988 sb
->s_root
= d_make_root(root
);
3990 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
3995 if (ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
))
3996 sb
->s_flags
|= MS_RDONLY
;
3998 /* determine the minimum size of new large inodes, if present */
3999 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
4000 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
4001 EXT4_GOOD_OLD_INODE_SIZE
;
4002 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
4003 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
4004 if (sbi
->s_want_extra_isize
<
4005 le16_to_cpu(es
->s_want_extra_isize
))
4006 sbi
->s_want_extra_isize
=
4007 le16_to_cpu(es
->s_want_extra_isize
);
4008 if (sbi
->s_want_extra_isize
<
4009 le16_to_cpu(es
->s_min_extra_isize
))
4010 sbi
->s_want_extra_isize
=
4011 le16_to_cpu(es
->s_min_extra_isize
);
4014 /* Check if enough inode space is available */
4015 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
4016 sbi
->s_inode_size
) {
4017 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
4018 EXT4_GOOD_OLD_INODE_SIZE
;
4019 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
4023 err
= ext4_reserve_clusters(sbi
, ext4_calculate_resv_clusters(sbi
));
4025 ext4_msg(sb
, KERN_ERR
, "failed to reserve %llu clusters for "
4026 "reserved pool", ext4_calculate_resv_clusters(sbi
));
4027 goto failed_mount4a
;
4030 err
= ext4_setup_system_zone(sb
);
4032 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
4034 goto failed_mount4a
;
4038 err
= ext4_mb_init(sb
);
4040 ext4_msg(sb
, KERN_ERR
, "failed to initialize mballoc (%d)",
4045 err
= ext4_register_li_request(sb
, first_not_zeroed
);
4049 sbi
->s_kobj
.kset
= ext4_kset
;
4050 init_completion(&sbi
->s_kobj_unregister
);
4051 err
= kobject_init_and_add(&sbi
->s_kobj
, &ext4_ktype
, NULL
,
4057 /* Enable quota usage during mount. */
4058 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
) &&
4059 !(sb
->s_flags
& MS_RDONLY
)) {
4060 err
= ext4_enable_quotas(sb
);
4064 #endif /* CONFIG_QUOTA */
4066 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
4067 ext4_orphan_cleanup(sb
, es
);
4068 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
4069 if (needs_recovery
) {
4070 ext4_msg(sb
, KERN_INFO
, "recovery complete");
4071 ext4_mark_recovery_complete(sb
, es
);
4073 if (EXT4_SB(sb
)->s_journal
) {
4074 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
4075 descr
= " journalled data mode";
4076 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
4077 descr
= " ordered data mode";
4079 descr
= " writeback data mode";
4081 descr
= "out journal";
4083 if (test_opt(sb
, DISCARD
)) {
4084 struct request_queue
*q
= bdev_get_queue(sb
->s_bdev
);
4085 if (!blk_queue_discard(q
))
4086 ext4_msg(sb
, KERN_WARNING
,
4087 "mounting with \"discard\" option, but "
4088 "the device does not support discard");
4091 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s. "
4092 "Opts: %s%s%s", descr
, sbi
->s_es
->s_mount_opts
,
4093 *sbi
->s_es
->s_mount_opts
? "; " : "", orig_data
);
4095 if (es
->s_error_count
)
4096 mod_timer(&sbi
->s_err_report
, jiffies
+ 300*HZ
); /* 5 minutes */
4103 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
4108 kobject_del(&sbi
->s_kobj
);
4111 ext4_unregister_li_request(sb
);
4113 ext4_mb_release(sb
);
4115 ext4_ext_release(sb
);
4116 ext4_release_system_zone(sb
);
4121 ext4_msg(sb
, KERN_ERR
, "mount failed");
4122 if (EXT4_SB(sb
)->rsv_conversion_wq
)
4123 destroy_workqueue(EXT4_SB(sb
)->rsv_conversion_wq
);
4124 if (EXT4_SB(sb
)->unrsv_conversion_wq
)
4125 destroy_workqueue(EXT4_SB(sb
)->unrsv_conversion_wq
);
4127 if (sbi
->s_journal
) {
4128 jbd2_journal_destroy(sbi
->s_journal
);
4129 sbi
->s_journal
= NULL
;
4132 ext4_es_unregister_shrinker(sbi
);
4133 del_timer(&sbi
->s_err_report
);
4134 if (sbi
->s_flex_groups
)
4135 ext4_kvfree(sbi
->s_flex_groups
);
4136 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
4137 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
4138 percpu_counter_destroy(&sbi
->s_dirs_counter
);
4139 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
4140 percpu_counter_destroy(&sbi
->s_extent_cache_cnt
);
4142 kthread_stop(sbi
->s_mmp_tsk
);
4144 for (i
= 0; i
< db_count
; i
++)
4145 brelse(sbi
->s_group_desc
[i
]);
4146 ext4_kvfree(sbi
->s_group_desc
);
4148 if (sbi
->s_chksum_driver
)
4149 crypto_free_shash(sbi
->s_chksum_driver
);
4151 remove_proc_entry("options", sbi
->s_proc
);
4152 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
4155 for (i
= 0; i
< MAXQUOTAS
; i
++)
4156 kfree(sbi
->s_qf_names
[i
]);
4158 ext4_blkdev_remove(sbi
);
4161 sb
->s_fs_info
= NULL
;
4162 kfree(sbi
->s_blockgroup_lock
);
4166 return err
? err
: ret
;
4170 * Setup any per-fs journal parameters now. We'll do this both on
4171 * initial mount, once the journal has been initialised but before we've
4172 * done any recovery; and again on any subsequent remount.
4174 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
4176 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4178 journal
->j_commit_interval
= sbi
->s_commit_interval
;
4179 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
4180 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
4182 write_lock(&journal
->j_state_lock
);
4183 if (test_opt(sb
, BARRIER
))
4184 journal
->j_flags
|= JBD2_BARRIER
;
4186 journal
->j_flags
&= ~JBD2_BARRIER
;
4187 if (test_opt(sb
, DATA_ERR_ABORT
))
4188 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
4190 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
4191 write_unlock(&journal
->j_state_lock
);
4194 static journal_t
*ext4_get_journal(struct super_block
*sb
,
4195 unsigned int journal_inum
)
4197 struct inode
*journal_inode
;
4200 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4202 /* First, test for the existence of a valid inode on disk. Bad
4203 * things happen if we iget() an unused inode, as the subsequent
4204 * iput() will try to delete it. */
4206 journal_inode
= ext4_iget(sb
, journal_inum
);
4207 if (IS_ERR(journal_inode
)) {
4208 ext4_msg(sb
, KERN_ERR
, "no journal found");
4211 if (!journal_inode
->i_nlink
) {
4212 make_bad_inode(journal_inode
);
4213 iput(journal_inode
);
4214 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
4218 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4219 journal_inode
, journal_inode
->i_size
);
4220 if (!S_ISREG(journal_inode
->i_mode
)) {
4221 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
4222 iput(journal_inode
);
4226 journal
= jbd2_journal_init_inode(journal_inode
);
4228 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
4229 iput(journal_inode
);
4232 journal
->j_private
= sb
;
4233 ext4_init_journal_params(sb
, journal
);
4237 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
4240 struct buffer_head
*bh
;
4244 int hblock
, blocksize
;
4245 ext4_fsblk_t sb_block
;
4246 unsigned long offset
;
4247 struct ext4_super_block
*es
;
4248 struct block_device
*bdev
;
4250 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4252 bdev
= ext4_blkdev_get(j_dev
, sb
);
4256 blocksize
= sb
->s_blocksize
;
4257 hblock
= bdev_logical_block_size(bdev
);
4258 if (blocksize
< hblock
) {
4259 ext4_msg(sb
, KERN_ERR
,
4260 "blocksize too small for journal device");
4264 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
4265 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
4266 set_blocksize(bdev
, blocksize
);
4267 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
4268 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
4269 "external journal");
4273 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
4274 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
4275 !(le32_to_cpu(es
->s_feature_incompat
) &
4276 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
4277 ext4_msg(sb
, KERN_ERR
, "external journal has "
4283 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
4284 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
4289 len
= ext4_blocks_count(es
);
4290 start
= sb_block
+ 1;
4291 brelse(bh
); /* we're done with the superblock */
4293 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
4294 start
, len
, blocksize
);
4296 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
4299 journal
->j_private
= sb
;
4300 ll_rw_block(READ
| REQ_META
| REQ_PRIO
, 1, &journal
->j_sb_buffer
);
4301 wait_on_buffer(journal
->j_sb_buffer
);
4302 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
4303 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
4306 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
4307 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
4308 "user (unsupported) - %d",
4309 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
4312 EXT4_SB(sb
)->journal_bdev
= bdev
;
4313 ext4_init_journal_params(sb
, journal
);
4317 jbd2_journal_destroy(journal
);
4319 ext4_blkdev_put(bdev
);
4323 static int ext4_load_journal(struct super_block
*sb
,
4324 struct ext4_super_block
*es
,
4325 unsigned long journal_devnum
)
4328 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
4331 int really_read_only
;
4333 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4335 if (journal_devnum
&&
4336 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4337 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
4338 "numbers have changed");
4339 journal_dev
= new_decode_dev(journal_devnum
);
4341 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
4343 really_read_only
= bdev_read_only(sb
->s_bdev
);
4346 * Are we loading a blank journal or performing recovery after a
4347 * crash? For recovery, we need to check in advance whether we
4348 * can get read-write access to the device.
4350 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
4351 if (sb
->s_flags
& MS_RDONLY
) {
4352 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
4353 "required on readonly filesystem");
4354 if (really_read_only
) {
4355 ext4_msg(sb
, KERN_ERR
, "write access "
4356 "unavailable, cannot proceed");
4359 ext4_msg(sb
, KERN_INFO
, "write access will "
4360 "be enabled during recovery");
4364 if (journal_inum
&& journal_dev
) {
4365 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
4366 "and inode journals!");
4371 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
4374 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
4378 if (!(journal
->j_flags
& JBD2_BARRIER
))
4379 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
4381 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
4382 err
= jbd2_journal_wipe(journal
, !really_read_only
);
4384 char *save
= kmalloc(EXT4_S_ERR_LEN
, GFP_KERNEL
);
4386 memcpy(save
, ((char *) es
) +
4387 EXT4_S_ERR_START
, EXT4_S_ERR_LEN
);
4388 err
= jbd2_journal_load(journal
);
4390 memcpy(((char *) es
) + EXT4_S_ERR_START
,
4391 save
, EXT4_S_ERR_LEN
);
4396 ext4_msg(sb
, KERN_ERR
, "error loading journal");
4397 jbd2_journal_destroy(journal
);
4401 EXT4_SB(sb
)->s_journal
= journal
;
4402 ext4_clear_journal_err(sb
, es
);
4404 if (!really_read_only
&& journal_devnum
&&
4405 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4406 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
4408 /* Make sure we flush the recovery flag to disk. */
4409 ext4_commit_super(sb
, 1);
4415 static int ext4_commit_super(struct super_block
*sb
, int sync
)
4417 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
4418 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
4421 if (!sbh
|| block_device_ejected(sb
))
4423 if (buffer_write_io_error(sbh
)) {
4425 * Oh, dear. A previous attempt to write the
4426 * superblock failed. This could happen because the
4427 * USB device was yanked out. Or it could happen to
4428 * be a transient write error and maybe the block will
4429 * be remapped. Nothing we can do but to retry the
4430 * write and hope for the best.
4432 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
4433 "superblock detected");
4434 clear_buffer_write_io_error(sbh
);
4435 set_buffer_uptodate(sbh
);
4438 * If the file system is mounted read-only, don't update the
4439 * superblock write time. This avoids updating the superblock
4440 * write time when we are mounting the root file system
4441 * read/only but we need to replay the journal; at that point,
4442 * for people who are east of GMT and who make their clock
4443 * tick in localtime for Windows bug-for-bug compatibility,
4444 * the clock is set in the future, and this will cause e2fsck
4445 * to complain and force a full file system check.
4447 if (!(sb
->s_flags
& MS_RDONLY
))
4448 es
->s_wtime
= cpu_to_le32(get_seconds());
4449 if (sb
->s_bdev
->bd_part
)
4450 es
->s_kbytes_written
=
4451 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
4452 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
4453 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
4455 es
->s_kbytes_written
=
4456 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
);
4457 ext4_free_blocks_count_set(es
,
4458 EXT4_C2B(EXT4_SB(sb
), percpu_counter_sum_positive(
4459 &EXT4_SB(sb
)->s_freeclusters_counter
)));
4460 es
->s_free_inodes_count
=
4461 cpu_to_le32(percpu_counter_sum_positive(
4462 &EXT4_SB(sb
)->s_freeinodes_counter
));
4463 BUFFER_TRACE(sbh
, "marking dirty");
4464 ext4_superblock_csum_set(sb
);
4465 mark_buffer_dirty(sbh
);
4467 error
= sync_dirty_buffer(sbh
);
4471 error
= buffer_write_io_error(sbh
);
4473 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
4475 clear_buffer_write_io_error(sbh
);
4476 set_buffer_uptodate(sbh
);
4483 * Have we just finished recovery? If so, and if we are mounting (or
4484 * remounting) the filesystem readonly, then we will end up with a
4485 * consistent fs on disk. Record that fact.
4487 static void ext4_mark_recovery_complete(struct super_block
*sb
,
4488 struct ext4_super_block
*es
)
4490 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
4492 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
4493 BUG_ON(journal
!= NULL
);
4496 jbd2_journal_lock_updates(journal
);
4497 if (jbd2_journal_flush(journal
) < 0)
4500 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
4501 sb
->s_flags
& MS_RDONLY
) {
4502 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4503 ext4_commit_super(sb
, 1);
4507 jbd2_journal_unlock_updates(journal
);
4511 * If we are mounting (or read-write remounting) a filesystem whose journal
4512 * has recorded an error from a previous lifetime, move that error to the
4513 * main filesystem now.
4515 static void ext4_clear_journal_err(struct super_block
*sb
,
4516 struct ext4_super_block
*es
)
4522 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4524 journal
= EXT4_SB(sb
)->s_journal
;
4527 * Now check for any error status which may have been recorded in the
4528 * journal by a prior ext4_error() or ext4_abort()
4531 j_errno
= jbd2_journal_errno(journal
);
4535 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
4536 ext4_warning(sb
, "Filesystem error recorded "
4537 "from previous mount: %s", errstr
);
4538 ext4_warning(sb
, "Marking fs in need of filesystem check.");
4540 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
4541 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
4542 ext4_commit_super(sb
, 1);
4544 jbd2_journal_clear_err(journal
);
4545 jbd2_journal_update_sb_errno(journal
);
4550 * Force the running and committing transactions to commit,
4551 * and wait on the commit.
4553 int ext4_force_commit(struct super_block
*sb
)
4557 if (sb
->s_flags
& MS_RDONLY
)
4560 journal
= EXT4_SB(sb
)->s_journal
;
4561 return ext4_journal_force_commit(journal
);
4564 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
4568 bool needs_barrier
= false;
4569 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4571 trace_ext4_sync_fs(sb
, wait
);
4572 flush_workqueue(sbi
->rsv_conversion_wq
);
4573 flush_workqueue(sbi
->unrsv_conversion_wq
);
4575 * Writeback quota in non-journalled quota case - journalled quota has
4578 dquot_writeback_dquots(sb
, -1);
4580 * Data writeback is possible w/o journal transaction, so barrier must
4581 * being sent at the end of the function. But we can skip it if
4582 * transaction_commit will do it for us.
4584 target
= jbd2_get_latest_transaction(sbi
->s_journal
);
4585 if (wait
&& sbi
->s_journal
->j_flags
& JBD2_BARRIER
&&
4586 !jbd2_trans_will_send_data_barrier(sbi
->s_journal
, target
))
4587 needs_barrier
= true;
4589 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
4591 ret
= jbd2_log_wait_commit(sbi
->s_journal
, target
);
4593 if (needs_barrier
) {
4595 err
= blkdev_issue_flush(sb
->s_bdev
, GFP_KERNEL
, NULL
);
4603 static int ext4_sync_fs_nojournal(struct super_block
*sb
, int wait
)
4607 trace_ext4_sync_fs(sb
, wait
);
4608 flush_workqueue(EXT4_SB(sb
)->rsv_conversion_wq
);
4609 flush_workqueue(EXT4_SB(sb
)->unrsv_conversion_wq
);
4610 dquot_writeback_dquots(sb
, -1);
4611 if (wait
&& test_opt(sb
, BARRIER
))
4612 ret
= blkdev_issue_flush(sb
->s_bdev
, GFP_KERNEL
, NULL
);
4618 * LVM calls this function before a (read-only) snapshot is created. This
4619 * gives us a chance to flush the journal completely and mark the fs clean.
4621 * Note that only this function cannot bring a filesystem to be in a clean
4622 * state independently. It relies on upper layer to stop all data & metadata
4625 static int ext4_freeze(struct super_block
*sb
)
4630 if (sb
->s_flags
& MS_RDONLY
)
4633 journal
= EXT4_SB(sb
)->s_journal
;
4635 /* Now we set up the journal barrier. */
4636 jbd2_journal_lock_updates(journal
);
4639 * Don't clear the needs_recovery flag if we failed to flush
4642 error
= jbd2_journal_flush(journal
);
4646 /* Journal blocked and flushed, clear needs_recovery flag. */
4647 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4648 error
= ext4_commit_super(sb
, 1);
4650 /* we rely on upper layer to stop further updates */
4651 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
4656 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4657 * flag here, even though the filesystem is not technically dirty yet.
4659 static int ext4_unfreeze(struct super_block
*sb
)
4661 if (sb
->s_flags
& MS_RDONLY
)
4664 /* Reset the needs_recovery flag before the fs is unlocked. */
4665 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4666 ext4_commit_super(sb
, 1);
4671 * Structure to save mount options for ext4_remount's benefit
4673 struct ext4_mount_options
{
4674 unsigned long s_mount_opt
;
4675 unsigned long s_mount_opt2
;
4678 unsigned long s_commit_interval
;
4679 u32 s_min_batch_time
, s_max_batch_time
;
4682 char *s_qf_names
[MAXQUOTAS
];
4686 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
4688 struct ext4_super_block
*es
;
4689 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4690 unsigned long old_sb_flags
;
4691 struct ext4_mount_options old_opts
;
4692 int enable_quota
= 0;
4694 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
4699 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
4701 /* Store the original options */
4702 old_sb_flags
= sb
->s_flags
;
4703 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
4704 old_opts
.s_mount_opt2
= sbi
->s_mount_opt2
;
4705 old_opts
.s_resuid
= sbi
->s_resuid
;
4706 old_opts
.s_resgid
= sbi
->s_resgid
;
4707 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
4708 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
4709 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
4711 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
4712 for (i
= 0; i
< MAXQUOTAS
; i
++)
4713 if (sbi
->s_qf_names
[i
]) {
4714 old_opts
.s_qf_names
[i
] = kstrdup(sbi
->s_qf_names
[i
],
4716 if (!old_opts
.s_qf_names
[i
]) {
4717 for (j
= 0; j
< i
; j
++)
4718 kfree(old_opts
.s_qf_names
[j
]);
4723 old_opts
.s_qf_names
[i
] = NULL
;
4725 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
4726 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
4729 * Allow the "check" option to be passed as a remount option.
4731 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
, 1)) {
4736 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
4737 ext4_abort(sb
, "Abort forced by user");
4739 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
4740 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
4744 if (sbi
->s_journal
) {
4745 ext4_init_journal_params(sb
, sbi
->s_journal
);
4746 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
4749 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
)) {
4750 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
4755 if (*flags
& MS_RDONLY
) {
4756 err
= dquot_suspend(sb
, -1);
4761 * First of all, the unconditional stuff we have to do
4762 * to disable replay of the journal when we next remount
4764 sb
->s_flags
|= MS_RDONLY
;
4767 * OK, test if we are remounting a valid rw partition
4768 * readonly, and if so set the rdonly flag and then
4769 * mark the partition as valid again.
4771 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
4772 (sbi
->s_mount_state
& EXT4_VALID_FS
))
4773 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
4776 ext4_mark_recovery_complete(sb
, es
);
4778 /* Make sure we can mount this feature set readwrite */
4779 if (!ext4_feature_set_ok(sb
, 0)) {
4784 * Make sure the group descriptor checksums
4785 * are sane. If they aren't, refuse to remount r/w.
4787 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
4788 struct ext4_group_desc
*gdp
=
4789 ext4_get_group_desc(sb
, g
, NULL
);
4791 if (!ext4_group_desc_csum_verify(sb
, g
, gdp
)) {
4792 ext4_msg(sb
, KERN_ERR
,
4793 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4794 g
, le16_to_cpu(ext4_group_desc_csum(sbi
, g
, gdp
)),
4795 le16_to_cpu(gdp
->bg_checksum
));
4802 * If we have an unprocessed orphan list hanging
4803 * around from a previously readonly bdev mount,
4804 * require a full umount/remount for now.
4806 if (es
->s_last_orphan
) {
4807 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
4808 "remount RDWR because of unprocessed "
4809 "orphan inode list. Please "
4810 "umount/remount instead");
4816 * Mounting a RDONLY partition read-write, so reread
4817 * and store the current valid flag. (It may have
4818 * been changed by e2fsck since we originally mounted
4822 ext4_clear_journal_err(sb
, es
);
4823 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
4824 if (!ext4_setup_super(sb
, es
, 0))
4825 sb
->s_flags
&= ~MS_RDONLY
;
4826 if (EXT4_HAS_INCOMPAT_FEATURE(sb
,
4827 EXT4_FEATURE_INCOMPAT_MMP
))
4828 if (ext4_multi_mount_protect(sb
,
4829 le64_to_cpu(es
->s_mmp_block
))) {
4838 * Reinitialize lazy itable initialization thread based on
4841 if ((sb
->s_flags
& MS_RDONLY
) || !test_opt(sb
, INIT_INODE_TABLE
))
4842 ext4_unregister_li_request(sb
);
4844 ext4_group_t first_not_zeroed
;
4845 first_not_zeroed
= ext4_has_uninit_itable(sb
);
4846 ext4_register_li_request(sb
, first_not_zeroed
);
4849 ext4_setup_system_zone(sb
);
4850 if (sbi
->s_journal
== NULL
&& !(old_sb_flags
& MS_RDONLY
))
4851 ext4_commit_super(sb
, 1);
4854 /* Release old quota file names */
4855 for (i
= 0; i
< MAXQUOTAS
; i
++)
4856 kfree(old_opts
.s_qf_names
[i
]);
4858 if (sb_any_quota_suspended(sb
))
4859 dquot_resume(sb
, -1);
4860 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
4861 EXT4_FEATURE_RO_COMPAT_QUOTA
)) {
4862 err
= ext4_enable_quotas(sb
);
4869 ext4_msg(sb
, KERN_INFO
, "re-mounted. Opts: %s", orig_data
);
4874 sb
->s_flags
= old_sb_flags
;
4875 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
4876 sbi
->s_mount_opt2
= old_opts
.s_mount_opt2
;
4877 sbi
->s_resuid
= old_opts
.s_resuid
;
4878 sbi
->s_resgid
= old_opts
.s_resgid
;
4879 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
4880 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
4881 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
4883 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
4884 for (i
= 0; i
< MAXQUOTAS
; i
++) {
4885 kfree(sbi
->s_qf_names
[i
]);
4886 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
4893 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
4895 struct super_block
*sb
= dentry
->d_sb
;
4896 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4897 struct ext4_super_block
*es
= sbi
->s_es
;
4898 ext4_fsblk_t overhead
= 0, resv_blocks
;
4901 resv_blocks
= EXT4_C2B(sbi
, atomic64_read(&sbi
->s_resv_clusters
));
4903 if (!test_opt(sb
, MINIX_DF
))
4904 overhead
= sbi
->s_overhead
;
4906 buf
->f_type
= EXT4_SUPER_MAGIC
;
4907 buf
->f_bsize
= sb
->s_blocksize
;
4908 buf
->f_blocks
= ext4_blocks_count(es
) - EXT4_C2B(sbi
, overhead
);
4909 bfree
= percpu_counter_sum_positive(&sbi
->s_freeclusters_counter
) -
4910 percpu_counter_sum_positive(&sbi
->s_dirtyclusters_counter
);
4911 /* prevent underflow in case that few free space is available */
4912 buf
->f_bfree
= EXT4_C2B(sbi
, max_t(s64
, bfree
, 0));
4913 buf
->f_bavail
= buf
->f_bfree
-
4914 (ext4_r_blocks_count(es
) + resv_blocks
);
4915 if (buf
->f_bfree
< (ext4_r_blocks_count(es
) + resv_blocks
))
4917 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
4918 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
4919 buf
->f_namelen
= EXT4_NAME_LEN
;
4920 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
4921 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
4922 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
4923 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
4928 /* Helper function for writing quotas on sync - we need to start transaction
4929 * before quota file is locked for write. Otherwise the are possible deadlocks:
4930 * Process 1 Process 2
4931 * ext4_create() quota_sync()
4932 * jbd2_journal_start() write_dquot()
4933 * dquot_initialize() down(dqio_mutex)
4934 * down(dqio_mutex) jbd2_journal_start()
4940 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
4942 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_id
.type
];
4945 static int ext4_write_dquot(struct dquot
*dquot
)
4949 struct inode
*inode
;
4951 inode
= dquot_to_inode(dquot
);
4952 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
,
4953 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
4955 return PTR_ERR(handle
);
4956 ret
= dquot_commit(dquot
);
4957 err
= ext4_journal_stop(handle
);
4963 static int ext4_acquire_dquot(struct dquot
*dquot
)
4968 handle
= ext4_journal_start(dquot_to_inode(dquot
), EXT4_HT_QUOTA
,
4969 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
4971 return PTR_ERR(handle
);
4972 ret
= dquot_acquire(dquot
);
4973 err
= ext4_journal_stop(handle
);
4979 static int ext4_release_dquot(struct dquot
*dquot
)
4984 handle
= ext4_journal_start(dquot_to_inode(dquot
), EXT4_HT_QUOTA
,
4985 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
4986 if (IS_ERR(handle
)) {
4987 /* Release dquot anyway to avoid endless cycle in dqput() */
4988 dquot_release(dquot
);
4989 return PTR_ERR(handle
);
4991 ret
= dquot_release(dquot
);
4992 err
= ext4_journal_stop(handle
);
4998 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
5000 struct super_block
*sb
= dquot
->dq_sb
;
5001 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
5003 /* Are we journaling quotas? */
5004 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
) ||
5005 sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
5006 dquot_mark_dquot_dirty(dquot
);
5007 return ext4_write_dquot(dquot
);
5009 return dquot_mark_dquot_dirty(dquot
);
5013 static int ext4_write_info(struct super_block
*sb
, int type
)
5018 /* Data block + inode block */
5019 handle
= ext4_journal_start(sb
->s_root
->d_inode
, EXT4_HT_QUOTA
, 2);
5021 return PTR_ERR(handle
);
5022 ret
= dquot_commit_info(sb
, type
);
5023 err
= ext4_journal_stop(handle
);
5030 * Turn on quotas during mount time - we need to find
5031 * the quota file and such...
5033 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
5035 return dquot_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
5036 EXT4_SB(sb
)->s_jquota_fmt
, type
);
5040 * Standard function to be called on quota_on
5042 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
5047 if (!test_opt(sb
, QUOTA
))
5050 /* Quotafile not on the same filesystem? */
5051 if (path
->dentry
->d_sb
!= sb
)
5053 /* Journaling quota? */
5054 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
5055 /* Quotafile not in fs root? */
5056 if (path
->dentry
->d_parent
!= sb
->s_root
)
5057 ext4_msg(sb
, KERN_WARNING
,
5058 "Quota file not on filesystem root. "
5059 "Journaled quota will not work");
5063 * When we journal data on quota file, we have to flush journal to see
5064 * all updates to the file when we bypass pagecache...
5066 if (EXT4_SB(sb
)->s_journal
&&
5067 ext4_should_journal_data(path
->dentry
->d_inode
)) {
5069 * We don't need to lock updates but journal_flush() could
5070 * otherwise be livelocked...
5072 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
5073 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
5074 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
5079 return dquot_quota_on(sb
, type
, format_id
, path
);
5082 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
5086 struct inode
*qf_inode
;
5087 unsigned long qf_inums
[MAXQUOTAS
] = {
5088 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
5089 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
)
5092 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
));
5094 if (!qf_inums
[type
])
5097 qf_inode
= ext4_iget(sb
, qf_inums
[type
]);
5098 if (IS_ERR(qf_inode
)) {
5099 ext4_error(sb
, "Bad quota inode # %lu", qf_inums
[type
]);
5100 return PTR_ERR(qf_inode
);
5103 /* Don't account quota for quota files to avoid recursion */
5104 qf_inode
->i_flags
|= S_NOQUOTA
;
5105 err
= dquot_enable(qf_inode
, type
, format_id
, flags
);
5111 /* Enable usage tracking for all quota types. */
5112 static int ext4_enable_quotas(struct super_block
*sb
)
5115 unsigned long qf_inums
[MAXQUOTAS
] = {
5116 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
5117 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
)
5120 sb_dqopt(sb
)->flags
|= DQUOT_QUOTA_SYS_FILE
;
5121 for (type
= 0; type
< MAXQUOTAS
; type
++) {
5122 if (qf_inums
[type
]) {
5123 err
= ext4_quota_enable(sb
, type
, QFMT_VFS_V1
,
5124 DQUOT_USAGE_ENABLED
);
5127 "Failed to enable quota tracking "
5128 "(type=%d, err=%d). Please run "
5129 "e2fsck to fix.", type
, err
);
5138 * quota_on function that is used when QUOTA feature is set.
5140 static int ext4_quota_on_sysfile(struct super_block
*sb
, int type
,
5143 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
))
5147 * USAGE was enabled at mount time. Only need to enable LIMITS now.
5149 return ext4_quota_enable(sb
, type
, format_id
, DQUOT_LIMITS_ENABLED
);
5152 static int ext4_quota_off(struct super_block
*sb
, int type
)
5154 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5157 /* Force all delayed allocation blocks to be allocated.
5158 * Caller already holds s_umount sem */
5159 if (test_opt(sb
, DELALLOC
))
5160 sync_filesystem(sb
);
5165 /* Update modification times of quota files when userspace can
5166 * start looking at them */
5167 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
, 1);
5170 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
5171 ext4_mark_inode_dirty(handle
, inode
);
5172 ext4_journal_stop(handle
);
5175 return dquot_quota_off(sb
, type
);
5179 * quota_off function that is used when QUOTA feature is set.
5181 static int ext4_quota_off_sysfile(struct super_block
*sb
, int type
)
5183 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
))
5186 /* Disable only the limits. */
5187 return dquot_disable(sb
, type
, DQUOT_LIMITS_ENABLED
);
5190 /* Read data from quotafile - avoid pagecache and such because we cannot afford
5191 * acquiring the locks... As quota files are never truncated and quota code
5192 * itself serializes the operations (and no one else should touch the files)
5193 * we don't have to be afraid of races */
5194 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
5195 size_t len
, loff_t off
)
5197 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5198 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5200 int offset
= off
& (sb
->s_blocksize
- 1);
5203 struct buffer_head
*bh
;
5204 loff_t i_size
= i_size_read(inode
);
5208 if (off
+len
> i_size
)
5211 while (toread
> 0) {
5212 tocopy
= sb
->s_blocksize
- offset
< toread
?
5213 sb
->s_blocksize
- offset
: toread
;
5214 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
5217 if (!bh
) /* A hole? */
5218 memset(data
, 0, tocopy
);
5220 memcpy(data
, bh
->b_data
+offset
, tocopy
);
5230 /* Write to quotafile (we know the transaction is already started and has
5231 * enough credits) */
5232 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
5233 const char *data
, size_t len
, loff_t off
)
5235 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5236 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5238 int offset
= off
& (sb
->s_blocksize
- 1);
5239 struct buffer_head
*bh
;
5240 handle_t
*handle
= journal_current_handle();
5242 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
5243 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5244 " cancelled because transaction is not started",
5245 (unsigned long long)off
, (unsigned long long)len
);
5249 * Since we account only one data block in transaction credits,
5250 * then it is impossible to cross a block boundary.
5252 if (sb
->s_blocksize
- offset
< len
) {
5253 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5254 " cancelled because not block aligned",
5255 (unsigned long long)off
, (unsigned long long)len
);
5259 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
5262 err
= ext4_journal_get_write_access(handle
, bh
);
5268 memcpy(bh
->b_data
+offset
, data
, len
);
5269 flush_dcache_page(bh
->b_page
);
5271 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
5276 if (inode
->i_size
< off
+ len
) {
5277 i_size_write(inode
, off
+ len
);
5278 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
5279 ext4_mark_inode_dirty(handle
, inode
);
5286 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
5287 const char *dev_name
, void *data
)
5289 return mount_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
);
5292 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5293 static inline void register_as_ext2(void)
5295 int err
= register_filesystem(&ext2_fs_type
);
5298 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
5301 static inline void unregister_as_ext2(void)
5303 unregister_filesystem(&ext2_fs_type
);
5306 static inline int ext2_feature_set_ok(struct super_block
*sb
)
5308 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT2_FEATURE_INCOMPAT_SUPP
))
5310 if (sb
->s_flags
& MS_RDONLY
)
5312 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT2_FEATURE_RO_COMPAT_SUPP
))
5317 static inline void register_as_ext2(void) { }
5318 static inline void unregister_as_ext2(void) { }
5319 static inline int ext2_feature_set_ok(struct super_block
*sb
) { return 0; }
5322 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5323 static inline void register_as_ext3(void)
5325 int err
= register_filesystem(&ext3_fs_type
);
5328 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
5331 static inline void unregister_as_ext3(void)
5333 unregister_filesystem(&ext3_fs_type
);
5336 static inline int ext3_feature_set_ok(struct super_block
*sb
)
5338 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT3_FEATURE_INCOMPAT_SUPP
))
5340 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
5342 if (sb
->s_flags
& MS_RDONLY
)
5344 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT3_FEATURE_RO_COMPAT_SUPP
))
5349 static inline void register_as_ext3(void) { }
5350 static inline void unregister_as_ext3(void) { }
5351 static inline int ext3_feature_set_ok(struct super_block
*sb
) { return 0; }
5354 static struct file_system_type ext4_fs_type
= {
5355 .owner
= THIS_MODULE
,
5357 .mount
= ext4_mount
,
5358 .kill_sb
= kill_block_super
,
5359 .fs_flags
= FS_REQUIRES_DEV
,
5361 MODULE_ALIAS_FS("ext4");
5363 static int __init
ext4_init_feat_adverts(void)
5365 struct ext4_features
*ef
;
5368 ef
= kzalloc(sizeof(struct ext4_features
), GFP_KERNEL
);
5372 ef
->f_kobj
.kset
= ext4_kset
;
5373 init_completion(&ef
->f_kobj_unregister
);
5374 ret
= kobject_init_and_add(&ef
->f_kobj
, &ext4_feat_ktype
, NULL
,
5387 static void ext4_exit_feat_adverts(void)
5389 kobject_put(&ext4_feat
->f_kobj
);
5390 wait_for_completion(&ext4_feat
->f_kobj_unregister
);
5394 /* Shared across all ext4 file systems */
5395 wait_queue_head_t ext4__ioend_wq
[EXT4_WQ_HASH_SZ
];
5396 struct mutex ext4__aio_mutex
[EXT4_WQ_HASH_SZ
];
5398 static int __init
ext4_init_fs(void)
5402 ext4_li_info
= NULL
;
5403 mutex_init(&ext4_li_mtx
);
5405 /* Build-time check for flags consistency */
5406 ext4_check_flag_values();
5408 for (i
= 0; i
< EXT4_WQ_HASH_SZ
; i
++) {
5409 mutex_init(&ext4__aio_mutex
[i
]);
5410 init_waitqueue_head(&ext4__ioend_wq
[i
]);
5413 err
= ext4_init_es();
5417 err
= ext4_init_pageio();
5421 err
= ext4_init_system_zone();
5424 ext4_kset
= kset_create_and_add("ext4", NULL
, fs_kobj
);
5429 ext4_proc_root
= proc_mkdir("fs/ext4", NULL
);
5431 err
= ext4_init_feat_adverts();
5435 err
= ext4_init_mballoc();
5439 err
= ext4_init_xattr();
5442 err
= init_inodecache();
5447 err
= register_filesystem(&ext4_fs_type
);
5453 unregister_as_ext2();
5454 unregister_as_ext3();
5455 destroy_inodecache();
5459 ext4_exit_mballoc();
5461 ext4_exit_feat_adverts();
5464 remove_proc_entry("fs/ext4", NULL
);
5465 kset_unregister(ext4_kset
);
5467 ext4_exit_system_zone();
5476 static void __exit
ext4_exit_fs(void)
5478 ext4_destroy_lazyinit_thread();
5479 unregister_as_ext2();
5480 unregister_as_ext3();
5481 unregister_filesystem(&ext4_fs_type
);
5482 destroy_inodecache();
5484 ext4_exit_mballoc();
5485 ext4_exit_feat_adverts();
5486 remove_proc_entry("fs/ext4", NULL
);
5487 kset_unregister(ext4_kset
);
5488 ext4_exit_system_zone();
5492 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5493 MODULE_DESCRIPTION("Fourth Extended Filesystem");
5494 MODULE_LICENSE("GPL");
5495 module_init(ext4_init_fs
)
5496 module_exit(ext4_exit_fs
)