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
;
62 static int ext4_mballoc_ready
;
64 static int ext4_load_journal(struct super_block
*, struct ext4_super_block
*,
65 unsigned long journal_devnum
);
66 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
);
67 static int ext4_commit_super(struct super_block
*sb
, int sync
);
68 static void ext4_mark_recovery_complete(struct super_block
*sb
,
69 struct ext4_super_block
*es
);
70 static void ext4_clear_journal_err(struct super_block
*sb
,
71 struct ext4_super_block
*es
);
72 static int ext4_sync_fs(struct super_block
*sb
, int wait
);
73 static int ext4_sync_fs_nojournal(struct super_block
*sb
, int wait
);
74 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
);
75 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
);
76 static int ext4_unfreeze(struct super_block
*sb
);
77 static int ext4_freeze(struct super_block
*sb
);
78 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
79 const char *dev_name
, void *data
);
80 static inline int ext2_feature_set_ok(struct super_block
*sb
);
81 static inline int ext3_feature_set_ok(struct super_block
*sb
);
82 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
);
83 static void ext4_destroy_lazyinit_thread(void);
84 static void ext4_unregister_li_request(struct super_block
*sb
);
85 static void ext4_clear_request_list(void);
86 static int ext4_reserve_clusters(struct ext4_sb_info
*, ext4_fsblk_t
);
88 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
89 static struct file_system_type ext2_fs_type
= {
93 .kill_sb
= kill_block_super
,
94 .fs_flags
= FS_REQUIRES_DEV
,
96 MODULE_ALIAS_FS("ext2");
98 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
100 #define IS_EXT2_SB(sb) (0)
104 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
105 static struct file_system_type ext3_fs_type
= {
106 .owner
= THIS_MODULE
,
109 .kill_sb
= kill_block_super
,
110 .fs_flags
= FS_REQUIRES_DEV
,
112 MODULE_ALIAS_FS("ext3");
113 MODULE_ALIAS("ext3");
114 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
116 #define IS_EXT3_SB(sb) (0)
119 static int ext4_verify_csum_type(struct super_block
*sb
,
120 struct ext4_super_block
*es
)
122 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
,
123 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))
126 return es
->s_checksum_type
== EXT4_CRC32C_CHKSUM
;
129 static __le32
ext4_superblock_csum(struct super_block
*sb
,
130 struct ext4_super_block
*es
)
132 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
133 int offset
= offsetof(struct ext4_super_block
, s_checksum
);
136 csum
= ext4_chksum(sbi
, ~0, (char *)es
, offset
);
138 return cpu_to_le32(csum
);
141 int ext4_superblock_csum_verify(struct super_block
*sb
,
142 struct ext4_super_block
*es
)
144 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
,
145 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))
148 return es
->s_checksum
== ext4_superblock_csum(sb
, es
);
151 void ext4_superblock_csum_set(struct super_block
*sb
)
153 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
155 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
,
156 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))
159 es
->s_checksum
= ext4_superblock_csum(sb
, es
);
162 void *ext4_kvmalloc(size_t size
, gfp_t flags
)
166 ret
= kmalloc(size
, flags
| __GFP_NOWARN
);
168 ret
= __vmalloc(size
, flags
, PAGE_KERNEL
);
172 void *ext4_kvzalloc(size_t size
, gfp_t flags
)
176 ret
= kzalloc(size
, flags
| __GFP_NOWARN
);
178 ret
= __vmalloc(size
, flags
| __GFP_ZERO
, PAGE_KERNEL
);
182 void ext4_kvfree(void *ptr
)
184 if (is_vmalloc_addr(ptr
))
191 ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
192 struct ext4_group_desc
*bg
)
194 return le32_to_cpu(bg
->bg_block_bitmap_lo
) |
195 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
196 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
199 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
200 struct ext4_group_desc
*bg
)
202 return le32_to_cpu(bg
->bg_inode_bitmap_lo
) |
203 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
204 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
207 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
208 struct ext4_group_desc
*bg
)
210 return le32_to_cpu(bg
->bg_inode_table_lo
) |
211 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
212 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
215 __u32
ext4_free_group_clusters(struct super_block
*sb
,
216 struct ext4_group_desc
*bg
)
218 return le16_to_cpu(bg
->bg_free_blocks_count_lo
) |
219 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
220 (__u32
)le16_to_cpu(bg
->bg_free_blocks_count_hi
) << 16 : 0);
223 __u32
ext4_free_inodes_count(struct super_block
*sb
,
224 struct ext4_group_desc
*bg
)
226 return le16_to_cpu(bg
->bg_free_inodes_count_lo
) |
227 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
228 (__u32
)le16_to_cpu(bg
->bg_free_inodes_count_hi
) << 16 : 0);
231 __u32
ext4_used_dirs_count(struct super_block
*sb
,
232 struct ext4_group_desc
*bg
)
234 return le16_to_cpu(bg
->bg_used_dirs_count_lo
) |
235 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
236 (__u32
)le16_to_cpu(bg
->bg_used_dirs_count_hi
) << 16 : 0);
239 __u32
ext4_itable_unused_count(struct super_block
*sb
,
240 struct ext4_group_desc
*bg
)
242 return le16_to_cpu(bg
->bg_itable_unused_lo
) |
243 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
244 (__u32
)le16_to_cpu(bg
->bg_itable_unused_hi
) << 16 : 0);
247 void ext4_block_bitmap_set(struct super_block
*sb
,
248 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
250 bg
->bg_block_bitmap_lo
= cpu_to_le32((u32
)blk
);
251 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
252 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
255 void ext4_inode_bitmap_set(struct super_block
*sb
,
256 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
258 bg
->bg_inode_bitmap_lo
= cpu_to_le32((u32
)blk
);
259 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
260 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
263 void ext4_inode_table_set(struct super_block
*sb
,
264 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
266 bg
->bg_inode_table_lo
= cpu_to_le32((u32
)blk
);
267 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
268 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
271 void ext4_free_group_clusters_set(struct super_block
*sb
,
272 struct ext4_group_desc
*bg
, __u32 count
)
274 bg
->bg_free_blocks_count_lo
= cpu_to_le16((__u16
)count
);
275 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
276 bg
->bg_free_blocks_count_hi
= cpu_to_le16(count
>> 16);
279 void ext4_free_inodes_set(struct super_block
*sb
,
280 struct ext4_group_desc
*bg
, __u32 count
)
282 bg
->bg_free_inodes_count_lo
= cpu_to_le16((__u16
)count
);
283 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
284 bg
->bg_free_inodes_count_hi
= cpu_to_le16(count
>> 16);
287 void ext4_used_dirs_set(struct super_block
*sb
,
288 struct ext4_group_desc
*bg
, __u32 count
)
290 bg
->bg_used_dirs_count_lo
= cpu_to_le16((__u16
)count
);
291 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
292 bg
->bg_used_dirs_count_hi
= cpu_to_le16(count
>> 16);
295 void ext4_itable_unused_set(struct super_block
*sb
,
296 struct ext4_group_desc
*bg
, __u32 count
)
298 bg
->bg_itable_unused_lo
= cpu_to_le16((__u16
)count
);
299 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
300 bg
->bg_itable_unused_hi
= cpu_to_le16(count
>> 16);
304 static void __save_error_info(struct super_block
*sb
, const char *func
,
307 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
309 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
310 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
311 es
->s_last_error_time
= cpu_to_le32(get_seconds());
312 strncpy(es
->s_last_error_func
, func
, sizeof(es
->s_last_error_func
));
313 es
->s_last_error_line
= cpu_to_le32(line
);
314 if (!es
->s_first_error_time
) {
315 es
->s_first_error_time
= es
->s_last_error_time
;
316 strncpy(es
->s_first_error_func
, func
,
317 sizeof(es
->s_first_error_func
));
318 es
->s_first_error_line
= cpu_to_le32(line
);
319 es
->s_first_error_ino
= es
->s_last_error_ino
;
320 es
->s_first_error_block
= es
->s_last_error_block
;
323 * Start the daily error reporting function if it hasn't been
326 if (!es
->s_error_count
)
327 mod_timer(&EXT4_SB(sb
)->s_err_report
, jiffies
+ 24*60*60*HZ
);
328 le32_add_cpu(&es
->s_error_count
, 1);
331 static void save_error_info(struct super_block
*sb
, const char *func
,
334 __save_error_info(sb
, func
, line
);
335 ext4_commit_super(sb
, 1);
339 * The del_gendisk() function uninitializes the disk-specific data
340 * structures, including the bdi structure, without telling anyone
341 * else. Once this happens, any attempt to call mark_buffer_dirty()
342 * (for example, by ext4_commit_super), will cause a kernel OOPS.
343 * This is a kludge to prevent these oops until we can put in a proper
344 * hook in del_gendisk() to inform the VFS and file system layers.
346 static int block_device_ejected(struct super_block
*sb
)
348 struct inode
*bd_inode
= sb
->s_bdev
->bd_inode
;
349 struct backing_dev_info
*bdi
= bd_inode
->i_mapping
->backing_dev_info
;
351 return bdi
->dev
== NULL
;
354 static void ext4_journal_commit_callback(journal_t
*journal
, transaction_t
*txn
)
356 struct super_block
*sb
= journal
->j_private
;
357 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
358 int error
= is_journal_aborted(journal
);
359 struct ext4_journal_cb_entry
*jce
;
361 BUG_ON(txn
->t_state
== T_FINISHED
);
362 spin_lock(&sbi
->s_md_lock
);
363 while (!list_empty(&txn
->t_private_list
)) {
364 jce
= list_entry(txn
->t_private_list
.next
,
365 struct ext4_journal_cb_entry
, jce_list
);
366 list_del_init(&jce
->jce_list
);
367 spin_unlock(&sbi
->s_md_lock
);
368 jce
->jce_func(sb
, jce
, error
);
369 spin_lock(&sbi
->s_md_lock
);
371 spin_unlock(&sbi
->s_md_lock
);
374 /* Deal with the reporting of failure conditions on a filesystem such as
375 * inconsistencies detected or read IO failures.
377 * On ext2, we can store the error state of the filesystem in the
378 * superblock. That is not possible on ext4, because we may have other
379 * write ordering constraints on the superblock which prevent us from
380 * writing it out straight away; and given that the journal is about to
381 * be aborted, we can't rely on the current, or future, transactions to
382 * write out the superblock safely.
384 * We'll just use the jbd2_journal_abort() error code to record an error in
385 * the journal instead. On recovery, the journal will complain about
386 * that error until we've noted it down and cleared it.
389 static void ext4_handle_error(struct super_block
*sb
)
391 if (sb
->s_flags
& MS_RDONLY
)
394 if (!test_opt(sb
, ERRORS_CONT
)) {
395 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
397 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
399 jbd2_journal_abort(journal
, -EIO
);
401 if (test_opt(sb
, ERRORS_RO
)) {
402 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
404 * Make sure updated value of ->s_mount_flags will be visible
405 * before ->s_flags update
408 sb
->s_flags
|= MS_RDONLY
;
410 if (test_opt(sb
, ERRORS_PANIC
))
411 panic("EXT4-fs (device %s): panic forced after error\n",
415 #define ext4_error_ratelimit(sb) \
416 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
419 void __ext4_error(struct super_block
*sb
, const char *function
,
420 unsigned int line
, const char *fmt
, ...)
422 struct va_format vaf
;
425 if (ext4_error_ratelimit(sb
)) {
430 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
431 sb
->s_id
, function
, line
, current
->comm
, &vaf
);
434 save_error_info(sb
, function
, line
);
435 ext4_handle_error(sb
);
438 void __ext4_error_inode(struct inode
*inode
, const char *function
,
439 unsigned int line
, ext4_fsblk_t block
,
440 const char *fmt
, ...)
443 struct va_format vaf
;
444 struct ext4_super_block
*es
= EXT4_SB(inode
->i_sb
)->s_es
;
446 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
447 es
->s_last_error_block
= cpu_to_le64(block
);
448 if (ext4_error_ratelimit(inode
->i_sb
)) {
453 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
454 "inode #%lu: block %llu: comm %s: %pV\n",
455 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
456 block
, current
->comm
, &vaf
);
458 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
459 "inode #%lu: comm %s: %pV\n",
460 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
461 current
->comm
, &vaf
);
464 save_error_info(inode
->i_sb
, function
, line
);
465 ext4_handle_error(inode
->i_sb
);
468 void __ext4_error_file(struct file
*file
, const char *function
,
469 unsigned int line
, ext4_fsblk_t block
,
470 const char *fmt
, ...)
473 struct va_format vaf
;
474 struct ext4_super_block
*es
;
475 struct inode
*inode
= file_inode(file
);
476 char pathname
[80], *path
;
478 es
= EXT4_SB(inode
->i_sb
)->s_es
;
479 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
480 if (ext4_error_ratelimit(inode
->i_sb
)) {
481 path
= d_path(&(file
->f_path
), pathname
, sizeof(pathname
));
489 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
490 "block %llu: comm %s: path %s: %pV\n",
491 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
492 block
, current
->comm
, path
, &vaf
);
495 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
496 "comm %s: path %s: %pV\n",
497 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
498 current
->comm
, path
, &vaf
);
501 save_error_info(inode
->i_sb
, function
, line
);
502 ext4_handle_error(inode
->i_sb
);
505 const char *ext4_decode_error(struct super_block
*sb
, int errno
,
512 errstr
= "IO failure";
515 errstr
= "Out of memory";
518 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
519 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
520 errstr
= "Journal has aborted";
522 errstr
= "Readonly filesystem";
525 /* If the caller passed in an extra buffer for unknown
526 * errors, textualise them now. Else we just return
529 /* Check for truncated error codes... */
530 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
539 /* __ext4_std_error decodes expected errors from journaling functions
540 * automatically and invokes the appropriate error response. */
542 void __ext4_std_error(struct super_block
*sb
, const char *function
,
543 unsigned int line
, int errno
)
548 /* Special case: if the error is EROFS, and we're not already
549 * inside a transaction, then there's really no point in logging
551 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
552 (sb
->s_flags
& MS_RDONLY
))
555 if (ext4_error_ratelimit(sb
)) {
556 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
557 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s:%d: %s\n",
558 sb
->s_id
, function
, line
, errstr
);
561 save_error_info(sb
, function
, line
);
562 ext4_handle_error(sb
);
566 * ext4_abort is a much stronger failure handler than ext4_error. The
567 * abort function may be used to deal with unrecoverable failures such
568 * as journal IO errors or ENOMEM at a critical moment in log management.
570 * We unconditionally force the filesystem into an ABORT|READONLY state,
571 * unless the error response on the fs has been set to panic in which
572 * case we take the easy way out and panic immediately.
575 void __ext4_abort(struct super_block
*sb
, const char *function
,
576 unsigned int line
, const char *fmt
, ...)
580 save_error_info(sb
, function
, line
);
582 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: ", sb
->s_id
,
588 if ((sb
->s_flags
& MS_RDONLY
) == 0) {
589 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
590 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
592 * Make sure updated value of ->s_mount_flags will be visible
593 * before ->s_flags update
596 sb
->s_flags
|= MS_RDONLY
;
597 if (EXT4_SB(sb
)->s_journal
)
598 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
599 save_error_info(sb
, function
, line
);
601 if (test_opt(sb
, ERRORS_PANIC
))
602 panic("EXT4-fs panic from previous error\n");
605 void __ext4_msg(struct super_block
*sb
,
606 const char *prefix
, const char *fmt
, ...)
608 struct va_format vaf
;
611 if (!___ratelimit(&(EXT4_SB(sb
)->s_msg_ratelimit_state
), "EXT4-fs"))
617 printk("%sEXT4-fs (%s): %pV\n", prefix
, sb
->s_id
, &vaf
);
621 void __ext4_warning(struct super_block
*sb
, const char *function
,
622 unsigned int line
, const char *fmt
, ...)
624 struct va_format vaf
;
627 if (!___ratelimit(&(EXT4_SB(sb
)->s_warning_ratelimit_state
),
634 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: %pV\n",
635 sb
->s_id
, function
, line
, &vaf
);
639 void __ext4_grp_locked_error(const char *function
, unsigned int line
,
640 struct super_block
*sb
, ext4_group_t grp
,
641 unsigned long ino
, ext4_fsblk_t block
,
642 const char *fmt
, ...)
646 struct va_format vaf
;
648 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
650 es
->s_last_error_ino
= cpu_to_le32(ino
);
651 es
->s_last_error_block
= cpu_to_le64(block
);
652 __save_error_info(sb
, function
, line
);
654 if (ext4_error_ratelimit(sb
)) {
658 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: group %u, ",
659 sb
->s_id
, function
, line
, grp
);
661 printk(KERN_CONT
"inode %lu: ", ino
);
663 printk(KERN_CONT
"block %llu:",
664 (unsigned long long) block
);
665 printk(KERN_CONT
"%pV\n", &vaf
);
669 if (test_opt(sb
, ERRORS_CONT
)) {
670 ext4_commit_super(sb
, 0);
674 ext4_unlock_group(sb
, grp
);
675 ext4_handle_error(sb
);
677 * We only get here in the ERRORS_RO case; relocking the group
678 * may be dangerous, but nothing bad will happen since the
679 * filesystem will have already been marked read/only and the
680 * journal has been aborted. We return 1 as a hint to callers
681 * who might what to use the return value from
682 * ext4_grp_locked_error() to distinguish between the
683 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
684 * aggressively from the ext4 function in question, with a
685 * more appropriate error code.
687 ext4_lock_group(sb
, grp
);
691 void ext4_update_dynamic_rev(struct super_block
*sb
)
693 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
695 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
699 "updating to rev %d because of new feature flag, "
700 "running e2fsck is recommended",
703 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
704 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
705 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
706 /* leave es->s_feature_*compat flags alone */
707 /* es->s_uuid will be set by e2fsck if empty */
710 * The rest of the superblock fields should be zero, and if not it
711 * means they are likely already in use, so leave them alone. We
712 * can leave it up to e2fsck to clean up any inconsistencies there.
717 * Open the external journal device
719 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
721 struct block_device
*bdev
;
722 char b
[BDEVNAME_SIZE
];
724 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
, sb
);
730 ext4_msg(sb
, KERN_ERR
, "failed to open journal device %s: %ld",
731 __bdevname(dev
, b
), PTR_ERR(bdev
));
736 * Release the journal device
738 static void ext4_blkdev_put(struct block_device
*bdev
)
740 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
743 static void ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
745 struct block_device
*bdev
;
746 bdev
= sbi
->journal_bdev
;
748 ext4_blkdev_put(bdev
);
749 sbi
->journal_bdev
= NULL
;
753 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
755 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
758 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
762 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
763 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
765 printk(KERN_ERR
"sb_info orphan list:\n");
766 list_for_each(l
, &sbi
->s_orphan
) {
767 struct inode
*inode
= orphan_list_entry(l
);
769 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
770 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
771 inode
->i_mode
, inode
->i_nlink
,
776 static void ext4_put_super(struct super_block
*sb
)
778 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
779 struct ext4_super_block
*es
= sbi
->s_es
;
782 ext4_unregister_li_request(sb
);
783 dquot_disable(sb
, -1, DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
785 flush_workqueue(sbi
->rsv_conversion_wq
);
786 destroy_workqueue(sbi
->rsv_conversion_wq
);
788 if (sbi
->s_journal
) {
789 err
= jbd2_journal_destroy(sbi
->s_journal
);
790 sbi
->s_journal
= NULL
;
792 ext4_abort(sb
, "Couldn't clean up the journal");
795 ext4_es_unregister_shrinker(sbi
);
796 del_timer_sync(&sbi
->s_err_report
);
797 ext4_release_system_zone(sb
);
799 ext4_ext_release(sb
);
800 ext4_xattr_put_super(sb
);
802 if (!(sb
->s_flags
& MS_RDONLY
)) {
803 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
804 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
806 if (!(sb
->s_flags
& MS_RDONLY
))
807 ext4_commit_super(sb
, 1);
810 remove_proc_entry("options", sbi
->s_proc
);
811 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
813 kobject_del(&sbi
->s_kobj
);
815 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
816 brelse(sbi
->s_group_desc
[i
]);
817 ext4_kvfree(sbi
->s_group_desc
);
818 ext4_kvfree(sbi
->s_flex_groups
);
819 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
820 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
821 percpu_counter_destroy(&sbi
->s_dirs_counter
);
822 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
823 percpu_counter_destroy(&sbi
->s_extent_cache_cnt
);
826 for (i
= 0; i
< MAXQUOTAS
; i
++)
827 kfree(sbi
->s_qf_names
[i
]);
830 /* Debugging code just in case the in-memory inode orphan list
831 * isn't empty. The on-disk one can be non-empty if we've
832 * detected an error and taken the fs readonly, but the
833 * in-memory list had better be clean by this point. */
834 if (!list_empty(&sbi
->s_orphan
))
835 dump_orphan_list(sb
, sbi
);
836 J_ASSERT(list_empty(&sbi
->s_orphan
));
838 invalidate_bdev(sb
->s_bdev
);
839 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
841 * Invalidate the journal device's buffers. We don't want them
842 * floating about in memory - the physical journal device may
843 * hotswapped, and it breaks the `ro-after' testing code.
845 sync_blockdev(sbi
->journal_bdev
);
846 invalidate_bdev(sbi
->journal_bdev
);
847 ext4_blkdev_remove(sbi
);
849 if (sbi
->s_mb_cache
) {
850 ext4_xattr_destroy_cache(sbi
->s_mb_cache
);
851 sbi
->s_mb_cache
= NULL
;
854 kthread_stop(sbi
->s_mmp_tsk
);
855 sb
->s_fs_info
= NULL
;
857 * Now that we are completely done shutting down the
858 * superblock, we need to actually destroy the kobject.
860 kobject_put(&sbi
->s_kobj
);
861 wait_for_completion(&sbi
->s_kobj_unregister
);
862 if (sbi
->s_chksum_driver
)
863 crypto_free_shash(sbi
->s_chksum_driver
);
864 kfree(sbi
->s_blockgroup_lock
);
868 static struct kmem_cache
*ext4_inode_cachep
;
871 * Called inside transaction, so use GFP_NOFS
873 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
875 struct ext4_inode_info
*ei
;
877 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
881 ei
->vfs_inode
.i_version
= 1;
882 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
883 spin_lock_init(&ei
->i_prealloc_lock
);
884 ext4_es_init_tree(&ei
->i_es_tree
);
885 rwlock_init(&ei
->i_es_lock
);
886 INIT_LIST_HEAD(&ei
->i_es_lru
);
888 ei
->i_touch_when
= 0;
889 ei
->i_reserved_data_blocks
= 0;
890 ei
->i_reserved_meta_blocks
= 0;
891 ei
->i_allocated_meta_blocks
= 0;
892 ei
->i_da_metadata_calc_len
= 0;
893 ei
->i_da_metadata_calc_last_lblock
= 0;
894 spin_lock_init(&(ei
->i_block_reservation_lock
));
896 ei
->i_reserved_quota
= 0;
899 INIT_LIST_HEAD(&ei
->i_rsv_conversion_list
);
900 spin_lock_init(&ei
->i_completed_io_lock
);
902 ei
->i_datasync_tid
= 0;
903 atomic_set(&ei
->i_ioend_count
, 0);
904 atomic_set(&ei
->i_unwritten
, 0);
905 INIT_WORK(&ei
->i_rsv_conversion_work
, ext4_end_io_rsv_work
);
907 return &ei
->vfs_inode
;
910 static int ext4_drop_inode(struct inode
*inode
)
912 int drop
= generic_drop_inode(inode
);
914 trace_ext4_drop_inode(inode
, drop
);
918 static void ext4_i_callback(struct rcu_head
*head
)
920 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
921 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
924 static void ext4_destroy_inode(struct inode
*inode
)
926 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
927 ext4_msg(inode
->i_sb
, KERN_ERR
,
928 "Inode %lu (%p): orphan list check failed!",
929 inode
->i_ino
, EXT4_I(inode
));
930 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
931 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
935 call_rcu(&inode
->i_rcu
, ext4_i_callback
);
938 static void init_once(void *foo
)
940 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
942 INIT_LIST_HEAD(&ei
->i_orphan
);
943 init_rwsem(&ei
->xattr_sem
);
944 init_rwsem(&ei
->i_data_sem
);
945 inode_init_once(&ei
->vfs_inode
);
948 static int __init
init_inodecache(void)
950 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
951 sizeof(struct ext4_inode_info
),
952 0, (SLAB_RECLAIM_ACCOUNT
|
955 if (ext4_inode_cachep
== NULL
)
960 static void destroy_inodecache(void)
963 * Make sure all delayed rcu free inodes are flushed before we
967 kmem_cache_destroy(ext4_inode_cachep
);
970 void ext4_clear_inode(struct inode
*inode
)
972 invalidate_inode_buffers(inode
);
975 ext4_discard_preallocations(inode
);
976 ext4_es_remove_extent(inode
, 0, EXT_MAX_BLOCKS
);
977 ext4_es_lru_del(inode
);
978 if (EXT4_I(inode
)->jinode
) {
979 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode
),
980 EXT4_I(inode
)->jinode
);
981 jbd2_free_inode(EXT4_I(inode
)->jinode
);
982 EXT4_I(inode
)->jinode
= NULL
;
986 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
987 u64 ino
, u32 generation
)
991 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
992 return ERR_PTR(-ESTALE
);
993 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
994 return ERR_PTR(-ESTALE
);
996 /* iget isn't really right if the inode is currently unallocated!!
998 * ext4_read_inode will return a bad_inode if the inode had been
999 * deleted, so we should be safe.
1001 * Currently we don't know the generation for parent directory, so
1002 * a generation of 0 means "accept any"
1004 inode
= ext4_iget(sb
, ino
);
1006 return ERR_CAST(inode
);
1007 if (generation
&& inode
->i_generation
!= generation
) {
1009 return ERR_PTR(-ESTALE
);
1015 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
1016 int fh_len
, int fh_type
)
1018 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
1019 ext4_nfs_get_inode
);
1022 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
1023 int fh_len
, int fh_type
)
1025 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
1026 ext4_nfs_get_inode
);
1030 * Try to release metadata pages (indirect blocks, directories) which are
1031 * mapped via the block device. Since these pages could have journal heads
1032 * which would prevent try_to_free_buffers() from freeing them, we must use
1033 * jbd2 layer's try_to_free_buffers() function to release them.
1035 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
1038 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
1040 WARN_ON(PageChecked(page
));
1041 if (!page_has_buffers(page
))
1044 return jbd2_journal_try_to_free_buffers(journal
, page
,
1045 wait
& ~__GFP_WAIT
);
1046 return try_to_free_buffers(page
);
1050 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1051 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1053 static int ext4_write_dquot(struct dquot
*dquot
);
1054 static int ext4_acquire_dquot(struct dquot
*dquot
);
1055 static int ext4_release_dquot(struct dquot
*dquot
);
1056 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1057 static int ext4_write_info(struct super_block
*sb
, int type
);
1058 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1060 static int ext4_quota_on_sysfile(struct super_block
*sb
, int type
,
1062 static int ext4_quota_off(struct super_block
*sb
, int type
);
1063 static int ext4_quota_off_sysfile(struct super_block
*sb
, int type
);
1064 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1065 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1066 size_t len
, loff_t off
);
1067 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1068 const char *data
, size_t len
, loff_t off
);
1069 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
1070 unsigned int flags
);
1071 static int ext4_enable_quotas(struct super_block
*sb
);
1073 static const struct dquot_operations ext4_quota_operations
= {
1074 .get_reserved_space
= ext4_get_reserved_space
,
1075 .write_dquot
= ext4_write_dquot
,
1076 .acquire_dquot
= ext4_acquire_dquot
,
1077 .release_dquot
= ext4_release_dquot
,
1078 .mark_dirty
= ext4_mark_dquot_dirty
,
1079 .write_info
= ext4_write_info
,
1080 .alloc_dquot
= dquot_alloc
,
1081 .destroy_dquot
= dquot_destroy
,
1084 static const struct quotactl_ops ext4_qctl_operations
= {
1085 .quota_on
= ext4_quota_on
,
1086 .quota_off
= ext4_quota_off
,
1087 .quota_sync
= dquot_quota_sync
,
1088 .get_info
= dquot_get_dqinfo
,
1089 .set_info
= dquot_set_dqinfo
,
1090 .get_dqblk
= dquot_get_dqblk
,
1091 .set_dqblk
= dquot_set_dqblk
1094 static const struct quotactl_ops ext4_qctl_sysfile_operations
= {
1095 .quota_on_meta
= ext4_quota_on_sysfile
,
1096 .quota_off
= ext4_quota_off_sysfile
,
1097 .quota_sync
= dquot_quota_sync
,
1098 .get_info
= dquot_get_dqinfo
,
1099 .set_info
= dquot_set_dqinfo
,
1100 .get_dqblk
= dquot_get_dqblk
,
1101 .set_dqblk
= dquot_set_dqblk
1105 static const struct super_operations ext4_sops
= {
1106 .alloc_inode
= ext4_alloc_inode
,
1107 .destroy_inode
= ext4_destroy_inode
,
1108 .write_inode
= ext4_write_inode
,
1109 .dirty_inode
= ext4_dirty_inode
,
1110 .drop_inode
= ext4_drop_inode
,
1111 .evict_inode
= ext4_evict_inode
,
1112 .put_super
= ext4_put_super
,
1113 .sync_fs
= ext4_sync_fs
,
1114 .freeze_fs
= ext4_freeze
,
1115 .unfreeze_fs
= ext4_unfreeze
,
1116 .statfs
= ext4_statfs
,
1117 .remount_fs
= ext4_remount
,
1118 .show_options
= ext4_show_options
,
1120 .quota_read
= ext4_quota_read
,
1121 .quota_write
= ext4_quota_write
,
1123 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1126 static const struct super_operations ext4_nojournal_sops
= {
1127 .alloc_inode
= ext4_alloc_inode
,
1128 .destroy_inode
= ext4_destroy_inode
,
1129 .write_inode
= ext4_write_inode
,
1130 .dirty_inode
= ext4_dirty_inode
,
1131 .drop_inode
= ext4_drop_inode
,
1132 .evict_inode
= ext4_evict_inode
,
1133 .sync_fs
= ext4_sync_fs_nojournal
,
1134 .put_super
= ext4_put_super
,
1135 .statfs
= ext4_statfs
,
1136 .remount_fs
= ext4_remount
,
1137 .show_options
= ext4_show_options
,
1139 .quota_read
= ext4_quota_read
,
1140 .quota_write
= ext4_quota_write
,
1142 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1145 static const struct export_operations ext4_export_ops
= {
1146 .fh_to_dentry
= ext4_fh_to_dentry
,
1147 .fh_to_parent
= ext4_fh_to_parent
,
1148 .get_parent
= ext4_get_parent
,
1152 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1153 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1154 Opt_nouid32
, Opt_debug
, Opt_removed
,
1155 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1156 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
,
1157 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
, Opt_journal_dev
,
1158 Opt_journal_path
, Opt_journal_checksum
, Opt_journal_async_commit
,
1159 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1160 Opt_data_err_abort
, Opt_data_err_ignore
,
1161 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1162 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1163 Opt_noquota
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1164 Opt_usrquota
, Opt_grpquota
, Opt_i_version
,
1165 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
, Opt_mblk_io_submit
,
1166 Opt_nomblk_io_submit
, Opt_block_validity
, Opt_noblock_validity
,
1167 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1168 Opt_dioread_nolock
, Opt_dioread_lock
,
1169 Opt_discard
, Opt_nodiscard
, Opt_init_itable
, Opt_noinit_itable
,
1170 Opt_max_dir_size_kb
,
1173 static const match_table_t tokens
= {
1174 {Opt_bsd_df
, "bsddf"},
1175 {Opt_minix_df
, "minixdf"},
1176 {Opt_grpid
, "grpid"},
1177 {Opt_grpid
, "bsdgroups"},
1178 {Opt_nogrpid
, "nogrpid"},
1179 {Opt_nogrpid
, "sysvgroups"},
1180 {Opt_resgid
, "resgid=%u"},
1181 {Opt_resuid
, "resuid=%u"},
1183 {Opt_err_cont
, "errors=continue"},
1184 {Opt_err_panic
, "errors=panic"},
1185 {Opt_err_ro
, "errors=remount-ro"},
1186 {Opt_nouid32
, "nouid32"},
1187 {Opt_debug
, "debug"},
1188 {Opt_removed
, "oldalloc"},
1189 {Opt_removed
, "orlov"},
1190 {Opt_user_xattr
, "user_xattr"},
1191 {Opt_nouser_xattr
, "nouser_xattr"},
1193 {Opt_noacl
, "noacl"},
1194 {Opt_noload
, "norecovery"},
1195 {Opt_noload
, "noload"},
1196 {Opt_removed
, "nobh"},
1197 {Opt_removed
, "bh"},
1198 {Opt_commit
, "commit=%u"},
1199 {Opt_min_batch_time
, "min_batch_time=%u"},
1200 {Opt_max_batch_time
, "max_batch_time=%u"},
1201 {Opt_journal_dev
, "journal_dev=%u"},
1202 {Opt_journal_path
, "journal_path=%s"},
1203 {Opt_journal_checksum
, "journal_checksum"},
1204 {Opt_journal_async_commit
, "journal_async_commit"},
1205 {Opt_abort
, "abort"},
1206 {Opt_data_journal
, "data=journal"},
1207 {Opt_data_ordered
, "data=ordered"},
1208 {Opt_data_writeback
, "data=writeback"},
1209 {Opt_data_err_abort
, "data_err=abort"},
1210 {Opt_data_err_ignore
, "data_err=ignore"},
1211 {Opt_offusrjquota
, "usrjquota="},
1212 {Opt_usrjquota
, "usrjquota=%s"},
1213 {Opt_offgrpjquota
, "grpjquota="},
1214 {Opt_grpjquota
, "grpjquota=%s"},
1215 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1216 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1217 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1218 {Opt_grpquota
, "grpquota"},
1219 {Opt_noquota
, "noquota"},
1220 {Opt_quota
, "quota"},
1221 {Opt_usrquota
, "usrquota"},
1222 {Opt_barrier
, "barrier=%u"},
1223 {Opt_barrier
, "barrier"},
1224 {Opt_nobarrier
, "nobarrier"},
1225 {Opt_i_version
, "i_version"},
1226 {Opt_stripe
, "stripe=%u"},
1227 {Opt_delalloc
, "delalloc"},
1228 {Opt_nodelalloc
, "nodelalloc"},
1229 {Opt_removed
, "mblk_io_submit"},
1230 {Opt_removed
, "nomblk_io_submit"},
1231 {Opt_block_validity
, "block_validity"},
1232 {Opt_noblock_validity
, "noblock_validity"},
1233 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1234 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1235 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1236 {Opt_auto_da_alloc
, "auto_da_alloc"},
1237 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1238 {Opt_dioread_nolock
, "dioread_nolock"},
1239 {Opt_dioread_lock
, "dioread_lock"},
1240 {Opt_discard
, "discard"},
1241 {Opt_nodiscard
, "nodiscard"},
1242 {Opt_init_itable
, "init_itable=%u"},
1243 {Opt_init_itable
, "init_itable"},
1244 {Opt_noinit_itable
, "noinit_itable"},
1245 {Opt_max_dir_size_kb
, "max_dir_size_kb=%u"},
1246 {Opt_removed
, "check=none"}, /* mount option from ext2/3 */
1247 {Opt_removed
, "nocheck"}, /* mount option from ext2/3 */
1248 {Opt_removed
, "reservation"}, /* mount option from ext2/3 */
1249 {Opt_removed
, "noreservation"}, /* mount option from ext2/3 */
1250 {Opt_removed
, "journal=%u"}, /* mount option from ext2/3 */
1254 static ext4_fsblk_t
get_sb_block(void **data
)
1256 ext4_fsblk_t sb_block
;
1257 char *options
= (char *) *data
;
1259 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1260 return 1; /* Default location */
1263 /* TODO: use simple_strtoll with >32bit ext4 */
1264 sb_block
= simple_strtoul(options
, &options
, 0);
1265 if (*options
&& *options
!= ',') {
1266 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1270 if (*options
== ',')
1272 *data
= (void *) options
;
1277 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1278 static char deprecated_msg
[] = "Mount option \"%s\" will be removed by %s\n"
1279 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1282 static int set_qf_name(struct super_block
*sb
, int qtype
, substring_t
*args
)
1284 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1288 if (sb_any_quota_loaded(sb
) &&
1289 !sbi
->s_qf_names
[qtype
]) {
1290 ext4_msg(sb
, KERN_ERR
,
1291 "Cannot change journaled "
1292 "quota options when quota turned on");
1295 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
)) {
1296 ext4_msg(sb
, KERN_ERR
, "Cannot set journaled quota options "
1297 "when QUOTA feature is enabled");
1300 qname
= match_strdup(args
);
1302 ext4_msg(sb
, KERN_ERR
,
1303 "Not enough memory for storing quotafile name");
1306 if (sbi
->s_qf_names
[qtype
]) {
1307 if (strcmp(sbi
->s_qf_names
[qtype
], qname
) == 0)
1310 ext4_msg(sb
, KERN_ERR
,
1311 "%s quota file already specified",
1315 if (strchr(qname
, '/')) {
1316 ext4_msg(sb
, KERN_ERR
,
1317 "quotafile must be on filesystem root");
1320 sbi
->s_qf_names
[qtype
] = qname
;
1328 static int clear_qf_name(struct super_block
*sb
, int qtype
)
1331 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1333 if (sb_any_quota_loaded(sb
) &&
1334 sbi
->s_qf_names
[qtype
]) {
1335 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled quota options"
1336 " when quota turned on");
1339 kfree(sbi
->s_qf_names
[qtype
]);
1340 sbi
->s_qf_names
[qtype
] = NULL
;
1345 #define MOPT_SET 0x0001
1346 #define MOPT_CLEAR 0x0002
1347 #define MOPT_NOSUPPORT 0x0004
1348 #define MOPT_EXPLICIT 0x0008
1349 #define MOPT_CLEAR_ERR 0x0010
1350 #define MOPT_GTE0 0x0020
1353 #define MOPT_QFMT 0x0040
1355 #define MOPT_Q MOPT_NOSUPPORT
1356 #define MOPT_QFMT MOPT_NOSUPPORT
1358 #define MOPT_DATAJ 0x0080
1359 #define MOPT_NO_EXT2 0x0100
1360 #define MOPT_NO_EXT3 0x0200
1361 #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1362 #define MOPT_STRING 0x0400
1364 static const struct mount_opts
{
1368 } ext4_mount_opts
[] = {
1369 {Opt_minix_df
, EXT4_MOUNT_MINIX_DF
, MOPT_SET
},
1370 {Opt_bsd_df
, EXT4_MOUNT_MINIX_DF
, MOPT_CLEAR
},
1371 {Opt_grpid
, EXT4_MOUNT_GRPID
, MOPT_SET
},
1372 {Opt_nogrpid
, EXT4_MOUNT_GRPID
, MOPT_CLEAR
},
1373 {Opt_block_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_SET
},
1374 {Opt_noblock_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_CLEAR
},
1375 {Opt_dioread_nolock
, EXT4_MOUNT_DIOREAD_NOLOCK
,
1376 MOPT_EXT4_ONLY
| MOPT_SET
},
1377 {Opt_dioread_lock
, EXT4_MOUNT_DIOREAD_NOLOCK
,
1378 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1379 {Opt_discard
, EXT4_MOUNT_DISCARD
, MOPT_SET
},
1380 {Opt_nodiscard
, EXT4_MOUNT_DISCARD
, MOPT_CLEAR
},
1381 {Opt_delalloc
, EXT4_MOUNT_DELALLOC
,
1382 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1383 {Opt_nodelalloc
, EXT4_MOUNT_DELALLOC
,
1384 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1385 {Opt_journal_checksum
, EXT4_MOUNT_JOURNAL_CHECKSUM
,
1386 MOPT_EXT4_ONLY
| MOPT_SET
},
1387 {Opt_journal_async_commit
, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT
|
1388 EXT4_MOUNT_JOURNAL_CHECKSUM
),
1389 MOPT_EXT4_ONLY
| MOPT_SET
},
1390 {Opt_noload
, EXT4_MOUNT_NOLOAD
, MOPT_NO_EXT2
| MOPT_SET
},
1391 {Opt_err_panic
, EXT4_MOUNT_ERRORS_PANIC
, MOPT_SET
| MOPT_CLEAR_ERR
},
1392 {Opt_err_ro
, EXT4_MOUNT_ERRORS_RO
, MOPT_SET
| MOPT_CLEAR_ERR
},
1393 {Opt_err_cont
, EXT4_MOUNT_ERRORS_CONT
, MOPT_SET
| MOPT_CLEAR_ERR
},
1394 {Opt_data_err_abort
, EXT4_MOUNT_DATA_ERR_ABORT
,
1395 MOPT_NO_EXT2
| MOPT_SET
},
1396 {Opt_data_err_ignore
, EXT4_MOUNT_DATA_ERR_ABORT
,
1397 MOPT_NO_EXT2
| MOPT_CLEAR
},
1398 {Opt_barrier
, EXT4_MOUNT_BARRIER
, MOPT_SET
},
1399 {Opt_nobarrier
, EXT4_MOUNT_BARRIER
, MOPT_CLEAR
},
1400 {Opt_noauto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_SET
},
1401 {Opt_auto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_CLEAR
},
1402 {Opt_noinit_itable
, EXT4_MOUNT_INIT_INODE_TABLE
, MOPT_CLEAR
},
1403 {Opt_commit
, 0, MOPT_GTE0
},
1404 {Opt_max_batch_time
, 0, MOPT_GTE0
},
1405 {Opt_min_batch_time
, 0, MOPT_GTE0
},
1406 {Opt_inode_readahead_blks
, 0, MOPT_GTE0
},
1407 {Opt_init_itable
, 0, MOPT_GTE0
},
1408 {Opt_stripe
, 0, MOPT_GTE0
},
1409 {Opt_resuid
, 0, MOPT_GTE0
},
1410 {Opt_resgid
, 0, MOPT_GTE0
},
1411 {Opt_journal_dev
, 0, MOPT_GTE0
},
1412 {Opt_journal_path
, 0, MOPT_STRING
},
1413 {Opt_journal_ioprio
, 0, MOPT_GTE0
},
1414 {Opt_data_journal
, EXT4_MOUNT_JOURNAL_DATA
, MOPT_NO_EXT2
| MOPT_DATAJ
},
1415 {Opt_data_ordered
, EXT4_MOUNT_ORDERED_DATA
, MOPT_NO_EXT2
| MOPT_DATAJ
},
1416 {Opt_data_writeback
, EXT4_MOUNT_WRITEBACK_DATA
,
1417 MOPT_NO_EXT2
| MOPT_DATAJ
},
1418 {Opt_user_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_SET
},
1419 {Opt_nouser_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_CLEAR
},
1420 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1421 {Opt_acl
, EXT4_MOUNT_POSIX_ACL
, MOPT_SET
},
1422 {Opt_noacl
, EXT4_MOUNT_POSIX_ACL
, MOPT_CLEAR
},
1424 {Opt_acl
, 0, MOPT_NOSUPPORT
},
1425 {Opt_noacl
, 0, MOPT_NOSUPPORT
},
1427 {Opt_nouid32
, EXT4_MOUNT_NO_UID32
, MOPT_SET
},
1428 {Opt_debug
, EXT4_MOUNT_DEBUG
, MOPT_SET
},
1429 {Opt_quota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
, MOPT_SET
| MOPT_Q
},
1430 {Opt_usrquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
,
1432 {Opt_grpquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_GRPQUOTA
,
1434 {Opt_noquota
, (EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
|
1435 EXT4_MOUNT_GRPQUOTA
), MOPT_CLEAR
| MOPT_Q
},
1436 {Opt_usrjquota
, 0, MOPT_Q
},
1437 {Opt_grpjquota
, 0, MOPT_Q
},
1438 {Opt_offusrjquota
, 0, MOPT_Q
},
1439 {Opt_offgrpjquota
, 0, MOPT_Q
},
1440 {Opt_jqfmt_vfsold
, QFMT_VFS_OLD
, MOPT_QFMT
},
1441 {Opt_jqfmt_vfsv0
, QFMT_VFS_V0
, MOPT_QFMT
},
1442 {Opt_jqfmt_vfsv1
, QFMT_VFS_V1
, MOPT_QFMT
},
1443 {Opt_max_dir_size_kb
, 0, MOPT_GTE0
},
1447 static int handle_mount_opt(struct super_block
*sb
, char *opt
, int token
,
1448 substring_t
*args
, unsigned long *journal_devnum
,
1449 unsigned int *journal_ioprio
, int is_remount
)
1451 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1452 const struct mount_opts
*m
;
1458 if (token
== Opt_usrjquota
)
1459 return set_qf_name(sb
, USRQUOTA
, &args
[0]);
1460 else if (token
== Opt_grpjquota
)
1461 return set_qf_name(sb
, GRPQUOTA
, &args
[0]);
1462 else if (token
== Opt_offusrjquota
)
1463 return clear_qf_name(sb
, USRQUOTA
);
1464 else if (token
== Opt_offgrpjquota
)
1465 return clear_qf_name(sb
, GRPQUOTA
);
1469 case Opt_nouser_xattr
:
1470 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, opt
, "3.5");
1473 return 1; /* handled by get_sb_block() */
1475 ext4_msg(sb
, KERN_WARNING
, "Ignoring removed %s option", opt
);
1478 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1481 sb
->s_flags
|= MS_I_VERSION
;
1485 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++)
1486 if (token
== m
->token
)
1489 if (m
->token
== Opt_err
) {
1490 ext4_msg(sb
, KERN_ERR
, "Unrecognized mount option \"%s\" "
1491 "or missing value", opt
);
1495 if ((m
->flags
& MOPT_NO_EXT2
) && IS_EXT2_SB(sb
)) {
1496 ext4_msg(sb
, KERN_ERR
,
1497 "Mount option \"%s\" incompatible with ext2", opt
);
1500 if ((m
->flags
& MOPT_NO_EXT3
) && IS_EXT3_SB(sb
)) {
1501 ext4_msg(sb
, KERN_ERR
,
1502 "Mount option \"%s\" incompatible with ext3", opt
);
1506 if (args
->from
&& !(m
->flags
& MOPT_STRING
) && match_int(args
, &arg
))
1508 if (args
->from
&& (m
->flags
& MOPT_GTE0
) && (arg
< 0))
1510 if (m
->flags
& MOPT_EXPLICIT
)
1511 set_opt2(sb
, EXPLICIT_DELALLOC
);
1512 if (m
->flags
& MOPT_CLEAR_ERR
)
1513 clear_opt(sb
, ERRORS_MASK
);
1514 if (token
== Opt_noquota
&& sb_any_quota_loaded(sb
)) {
1515 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1516 "options when quota turned on");
1520 if (m
->flags
& MOPT_NOSUPPORT
) {
1521 ext4_msg(sb
, KERN_ERR
, "%s option not supported", opt
);
1522 } else if (token
== Opt_commit
) {
1524 arg
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1525 sbi
->s_commit_interval
= HZ
* arg
;
1526 } else if (token
== Opt_max_batch_time
) {
1528 arg
= EXT4_DEF_MAX_BATCH_TIME
;
1529 sbi
->s_max_batch_time
= arg
;
1530 } else if (token
== Opt_min_batch_time
) {
1531 sbi
->s_min_batch_time
= arg
;
1532 } else if (token
== Opt_inode_readahead_blks
) {
1533 if (arg
&& (arg
> (1 << 30) || !is_power_of_2(arg
))) {
1534 ext4_msg(sb
, KERN_ERR
,
1535 "EXT4-fs: inode_readahead_blks must be "
1536 "0 or a power of 2 smaller than 2^31");
1539 sbi
->s_inode_readahead_blks
= arg
;
1540 } else if (token
== Opt_init_itable
) {
1541 set_opt(sb
, INIT_INODE_TABLE
);
1543 arg
= EXT4_DEF_LI_WAIT_MULT
;
1544 sbi
->s_li_wait_mult
= arg
;
1545 } else if (token
== Opt_max_dir_size_kb
) {
1546 sbi
->s_max_dir_size_kb
= arg
;
1547 } else if (token
== Opt_stripe
) {
1548 sbi
->s_stripe
= arg
;
1549 } else if (token
== Opt_resuid
) {
1550 uid
= make_kuid(current_user_ns(), arg
);
1551 if (!uid_valid(uid
)) {
1552 ext4_msg(sb
, KERN_ERR
, "Invalid uid value %d", arg
);
1555 sbi
->s_resuid
= uid
;
1556 } else if (token
== Opt_resgid
) {
1557 gid
= make_kgid(current_user_ns(), arg
);
1558 if (!gid_valid(gid
)) {
1559 ext4_msg(sb
, KERN_ERR
, "Invalid gid value %d", arg
);
1562 sbi
->s_resgid
= gid
;
1563 } else if (token
== Opt_journal_dev
) {
1565 ext4_msg(sb
, KERN_ERR
,
1566 "Cannot specify journal on remount");
1569 *journal_devnum
= arg
;
1570 } else if (token
== Opt_journal_path
) {
1572 struct inode
*journal_inode
;
1577 ext4_msg(sb
, KERN_ERR
,
1578 "Cannot specify journal on remount");
1581 journal_path
= match_strdup(&args
[0]);
1582 if (!journal_path
) {
1583 ext4_msg(sb
, KERN_ERR
, "error: could not dup "
1584 "journal device string");
1588 error
= kern_path(journal_path
, LOOKUP_FOLLOW
, &path
);
1590 ext4_msg(sb
, KERN_ERR
, "error: could not find "
1591 "journal device path: error %d", error
);
1592 kfree(journal_path
);
1596 journal_inode
= path
.dentry
->d_inode
;
1597 if (!S_ISBLK(journal_inode
->i_mode
)) {
1598 ext4_msg(sb
, KERN_ERR
, "error: journal path %s "
1599 "is not a block device", journal_path
);
1601 kfree(journal_path
);
1605 *journal_devnum
= new_encode_dev(journal_inode
->i_rdev
);
1607 kfree(journal_path
);
1608 } else if (token
== Opt_journal_ioprio
) {
1610 ext4_msg(sb
, KERN_ERR
, "Invalid journal IO priority"
1615 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
, arg
);
1616 } else if (m
->flags
& MOPT_DATAJ
) {
1618 if (!sbi
->s_journal
)
1619 ext4_msg(sb
, KERN_WARNING
, "Remounting file system with no journal so ignoring journalled data option");
1620 else if (test_opt(sb
, DATA_FLAGS
) != m
->mount_opt
) {
1621 ext4_msg(sb
, KERN_ERR
,
1622 "Cannot change data mode on remount");
1626 clear_opt(sb
, DATA_FLAGS
);
1627 sbi
->s_mount_opt
|= m
->mount_opt
;
1630 } else if (m
->flags
& MOPT_QFMT
) {
1631 if (sb_any_quota_loaded(sb
) &&
1632 sbi
->s_jquota_fmt
!= m
->mount_opt
) {
1633 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled "
1634 "quota options when quota turned on");
1637 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
1638 EXT4_FEATURE_RO_COMPAT_QUOTA
)) {
1639 ext4_msg(sb
, KERN_ERR
,
1640 "Cannot set journaled quota options "
1641 "when QUOTA feature is enabled");
1644 sbi
->s_jquota_fmt
= m
->mount_opt
;
1649 if (m
->flags
& MOPT_CLEAR
)
1651 else if (unlikely(!(m
->flags
& MOPT_SET
))) {
1652 ext4_msg(sb
, KERN_WARNING
,
1653 "buggy handling of option %s", opt
);
1658 sbi
->s_mount_opt
|= m
->mount_opt
;
1660 sbi
->s_mount_opt
&= ~m
->mount_opt
;
1665 static int parse_options(char *options
, struct super_block
*sb
,
1666 unsigned long *journal_devnum
,
1667 unsigned int *journal_ioprio
,
1670 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1672 substring_t args
[MAX_OPT_ARGS
];
1678 while ((p
= strsep(&options
, ",")) != NULL
) {
1682 * Initialize args struct so we know whether arg was
1683 * found; some options take optional arguments.
1685 args
[0].to
= args
[0].from
= NULL
;
1686 token
= match_token(p
, tokens
, args
);
1687 if (handle_mount_opt(sb
, p
, token
, args
, journal_devnum
,
1688 journal_ioprio
, is_remount
) < 0)
1692 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
) &&
1693 (test_opt(sb
, USRQUOTA
) || test_opt(sb
, GRPQUOTA
))) {
1694 ext4_msg(sb
, KERN_ERR
, "Cannot set quota options when QUOTA "
1695 "feature is enabled");
1698 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1699 if (test_opt(sb
, USRQUOTA
) && sbi
->s_qf_names
[USRQUOTA
])
1700 clear_opt(sb
, USRQUOTA
);
1702 if (test_opt(sb
, GRPQUOTA
) && sbi
->s_qf_names
[GRPQUOTA
])
1703 clear_opt(sb
, GRPQUOTA
);
1705 if (test_opt(sb
, GRPQUOTA
) || test_opt(sb
, USRQUOTA
)) {
1706 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1711 if (!sbi
->s_jquota_fmt
) {
1712 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1717 if (sbi
->s_jquota_fmt
) {
1718 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1719 "specified with no journaling "
1725 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
1727 BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
1729 if (blocksize
< PAGE_CACHE_SIZE
) {
1730 ext4_msg(sb
, KERN_ERR
, "can't mount with "
1731 "dioread_nolock if block size != PAGE_SIZE");
1738 static inline void ext4_show_quota_options(struct seq_file
*seq
,
1739 struct super_block
*sb
)
1741 #if defined(CONFIG_QUOTA)
1742 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1744 if (sbi
->s_jquota_fmt
) {
1747 switch (sbi
->s_jquota_fmt
) {
1758 seq_printf(seq
, ",jqfmt=%s", fmtname
);
1761 if (sbi
->s_qf_names
[USRQUOTA
])
1762 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
1764 if (sbi
->s_qf_names
[GRPQUOTA
])
1765 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
1769 static const char *token2str(int token
)
1771 const struct match_token
*t
;
1773 for (t
= tokens
; t
->token
!= Opt_err
; t
++)
1774 if (t
->token
== token
&& !strchr(t
->pattern
, '='))
1781 * - it's set to a non-default value OR
1782 * - if the per-sb default is different from the global default
1784 static int _ext4_show_options(struct seq_file
*seq
, struct super_block
*sb
,
1787 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1788 struct ext4_super_block
*es
= sbi
->s_es
;
1789 int def_errors
, def_mount_opt
= nodefs
? 0 : sbi
->s_def_mount_opt
;
1790 const struct mount_opts
*m
;
1791 char sep
= nodefs
? '\n' : ',';
1793 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1794 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1796 if (sbi
->s_sb_block
!= 1)
1797 SEQ_OPTS_PRINT("sb=%llu", sbi
->s_sb_block
);
1799 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++) {
1800 int want_set
= m
->flags
& MOPT_SET
;
1801 if (((m
->flags
& (MOPT_SET
|MOPT_CLEAR
)) == 0) ||
1802 (m
->flags
& MOPT_CLEAR_ERR
))
1804 if (!(m
->mount_opt
& (sbi
->s_mount_opt
^ def_mount_opt
)))
1805 continue; /* skip if same as the default */
1807 (sbi
->s_mount_opt
& m
->mount_opt
) != m
->mount_opt
) ||
1808 (!want_set
&& (sbi
->s_mount_opt
& m
->mount_opt
)))
1809 continue; /* select Opt_noFoo vs Opt_Foo */
1810 SEQ_OPTS_PRINT("%s", token2str(m
->token
));
1813 if (nodefs
|| !uid_eq(sbi
->s_resuid
, make_kuid(&init_user_ns
, EXT4_DEF_RESUID
)) ||
1814 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
)
1815 SEQ_OPTS_PRINT("resuid=%u",
1816 from_kuid_munged(&init_user_ns
, sbi
->s_resuid
));
1817 if (nodefs
|| !gid_eq(sbi
->s_resgid
, make_kgid(&init_user_ns
, EXT4_DEF_RESGID
)) ||
1818 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
)
1819 SEQ_OPTS_PRINT("resgid=%u",
1820 from_kgid_munged(&init_user_ns
, sbi
->s_resgid
));
1821 def_errors
= nodefs
? -1 : le16_to_cpu(es
->s_errors
);
1822 if (test_opt(sb
, ERRORS_RO
) && def_errors
!= EXT4_ERRORS_RO
)
1823 SEQ_OPTS_PUTS("errors=remount-ro");
1824 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
1825 SEQ_OPTS_PUTS("errors=continue");
1826 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
1827 SEQ_OPTS_PUTS("errors=panic");
1828 if (nodefs
|| sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
)
1829 SEQ_OPTS_PRINT("commit=%lu", sbi
->s_commit_interval
/ HZ
);
1830 if (nodefs
|| sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
)
1831 SEQ_OPTS_PRINT("min_batch_time=%u", sbi
->s_min_batch_time
);
1832 if (nodefs
|| sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
)
1833 SEQ_OPTS_PRINT("max_batch_time=%u", sbi
->s_max_batch_time
);
1834 if (sb
->s_flags
& MS_I_VERSION
)
1835 SEQ_OPTS_PUTS("i_version");
1836 if (nodefs
|| sbi
->s_stripe
)
1837 SEQ_OPTS_PRINT("stripe=%lu", sbi
->s_stripe
);
1838 if (EXT4_MOUNT_DATA_FLAGS
& (sbi
->s_mount_opt
^ def_mount_opt
)) {
1839 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
1840 SEQ_OPTS_PUTS("data=journal");
1841 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
1842 SEQ_OPTS_PUTS("data=ordered");
1843 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
1844 SEQ_OPTS_PUTS("data=writeback");
1847 sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
1848 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1849 sbi
->s_inode_readahead_blks
);
1851 if (nodefs
|| (test_opt(sb
, INIT_INODE_TABLE
) &&
1852 (sbi
->s_li_wait_mult
!= EXT4_DEF_LI_WAIT_MULT
)))
1853 SEQ_OPTS_PRINT("init_itable=%u", sbi
->s_li_wait_mult
);
1854 if (nodefs
|| sbi
->s_max_dir_size_kb
)
1855 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi
->s_max_dir_size_kb
);
1857 ext4_show_quota_options(seq
, sb
);
1861 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
)
1863 return _ext4_show_options(seq
, root
->d_sb
, 0);
1866 static int options_seq_show(struct seq_file
*seq
, void *offset
)
1868 struct super_block
*sb
= seq
->private;
1871 seq_puts(seq
, (sb
->s_flags
& MS_RDONLY
) ? "ro" : "rw");
1872 rc
= _ext4_show_options(seq
, sb
, 1);
1873 seq_puts(seq
, "\n");
1877 static int options_open_fs(struct inode
*inode
, struct file
*file
)
1879 return single_open(file
, options_seq_show
, PDE_DATA(inode
));
1882 static const struct file_operations ext4_seq_options_fops
= {
1883 .owner
= THIS_MODULE
,
1884 .open
= options_open_fs
,
1886 .llseek
= seq_lseek
,
1887 .release
= single_release
,
1890 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1893 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1896 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1897 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
1898 "forcing read-only mode");
1903 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1904 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
1905 "running e2fsck is recommended");
1906 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1907 ext4_msg(sb
, KERN_WARNING
,
1908 "warning: mounting fs with errors, "
1909 "running e2fsck is recommended");
1910 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) > 0 &&
1911 le16_to_cpu(es
->s_mnt_count
) >=
1912 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1913 ext4_msg(sb
, KERN_WARNING
,
1914 "warning: maximal mount count reached, "
1915 "running e2fsck is recommended");
1916 else if (le32_to_cpu(es
->s_checkinterval
) &&
1917 (le32_to_cpu(es
->s_lastcheck
) +
1918 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1919 ext4_msg(sb
, KERN_WARNING
,
1920 "warning: checktime reached, "
1921 "running e2fsck is recommended");
1922 if (!sbi
->s_journal
)
1923 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1924 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1925 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1926 le16_add_cpu(&es
->s_mnt_count
, 1);
1927 es
->s_mtime
= cpu_to_le32(get_seconds());
1928 ext4_update_dynamic_rev(sb
);
1930 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1932 ext4_commit_super(sb
, 1);
1934 if (test_opt(sb
, DEBUG
))
1935 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
1936 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1938 sbi
->s_groups_count
,
1939 EXT4_BLOCKS_PER_GROUP(sb
),
1940 EXT4_INODES_PER_GROUP(sb
),
1941 sbi
->s_mount_opt
, sbi
->s_mount_opt2
);
1943 cleancache_init_fs(sb
);
1947 int ext4_alloc_flex_bg_array(struct super_block
*sb
, ext4_group_t ngroup
)
1949 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1950 struct flex_groups
*new_groups
;
1953 if (!sbi
->s_log_groups_per_flex
)
1956 size
= ext4_flex_group(sbi
, ngroup
- 1) + 1;
1957 if (size
<= sbi
->s_flex_groups_allocated
)
1960 size
= roundup_pow_of_two(size
* sizeof(struct flex_groups
));
1961 new_groups
= ext4_kvzalloc(size
, GFP_KERNEL
);
1963 ext4_msg(sb
, KERN_ERR
, "not enough memory for %d flex groups",
1964 size
/ (int) sizeof(struct flex_groups
));
1968 if (sbi
->s_flex_groups
) {
1969 memcpy(new_groups
, sbi
->s_flex_groups
,
1970 (sbi
->s_flex_groups_allocated
*
1971 sizeof(struct flex_groups
)));
1972 ext4_kvfree(sbi
->s_flex_groups
);
1974 sbi
->s_flex_groups
= new_groups
;
1975 sbi
->s_flex_groups_allocated
= size
/ sizeof(struct flex_groups
);
1979 static int ext4_fill_flex_info(struct super_block
*sb
)
1981 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1982 struct ext4_group_desc
*gdp
= NULL
;
1983 ext4_group_t flex_group
;
1986 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1987 if (sbi
->s_log_groups_per_flex
< 1 || sbi
->s_log_groups_per_flex
> 31) {
1988 sbi
->s_log_groups_per_flex
= 0;
1992 err
= ext4_alloc_flex_bg_array(sb
, sbi
->s_groups_count
);
1996 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1997 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1999 flex_group
= ext4_flex_group(sbi
, i
);
2000 atomic_add(ext4_free_inodes_count(sb
, gdp
),
2001 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
2002 atomic64_add(ext4_free_group_clusters(sb
, gdp
),
2003 &sbi
->s_flex_groups
[flex_group
].free_clusters
);
2004 atomic_add(ext4_used_dirs_count(sb
, gdp
),
2005 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
2013 static __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
2014 struct ext4_group_desc
*gdp
)
2018 __le32 le_group
= cpu_to_le32(block_group
);
2020 if ((sbi
->s_es
->s_feature_ro_compat
&
2021 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))) {
2022 /* Use new metadata_csum algorithm */
2026 save_csum
= gdp
->bg_checksum
;
2027 gdp
->bg_checksum
= 0;
2028 csum32
= ext4_chksum(sbi
, sbi
->s_csum_seed
, (__u8
*)&le_group
,
2030 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)gdp
,
2032 gdp
->bg_checksum
= save_csum
;
2034 crc
= csum32
& 0xFFFF;
2038 /* old crc16 code */
2039 offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
2041 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
2042 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
2043 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
2044 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
2045 /* for checksum of struct ext4_group_desc do the rest...*/
2046 if ((sbi
->s_es
->s_feature_incompat
&
2047 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
2048 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
2049 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
2050 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
2054 return cpu_to_le16(crc
);
2057 int ext4_group_desc_csum_verify(struct super_block
*sb
, __u32 block_group
,
2058 struct ext4_group_desc
*gdp
)
2060 if (ext4_has_group_desc_csum(sb
) &&
2061 (gdp
->bg_checksum
!= ext4_group_desc_csum(EXT4_SB(sb
),
2068 void ext4_group_desc_csum_set(struct super_block
*sb
, __u32 block_group
,
2069 struct ext4_group_desc
*gdp
)
2071 if (!ext4_has_group_desc_csum(sb
))
2073 gdp
->bg_checksum
= ext4_group_desc_csum(EXT4_SB(sb
), block_group
, gdp
);
2076 /* Called at mount-time, super-block is locked */
2077 static int ext4_check_descriptors(struct super_block
*sb
,
2078 ext4_group_t
*first_not_zeroed
)
2080 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2081 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
2082 ext4_fsblk_t last_block
;
2083 ext4_fsblk_t block_bitmap
;
2084 ext4_fsblk_t inode_bitmap
;
2085 ext4_fsblk_t inode_table
;
2086 int flexbg_flag
= 0;
2087 ext4_group_t i
, grp
= sbi
->s_groups_count
;
2089 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
2092 ext4_debug("Checking group descriptors");
2094 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
2095 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2097 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
2098 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
2100 last_block
= first_block
+
2101 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2103 if ((grp
== sbi
->s_groups_count
) &&
2104 !(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2107 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
2108 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
2109 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2110 "Block bitmap for group %u not in group "
2111 "(block %llu)!", i
, block_bitmap
);
2114 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
2115 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
2116 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2117 "Inode bitmap for group %u not in group "
2118 "(block %llu)!", i
, inode_bitmap
);
2121 inode_table
= ext4_inode_table(sb
, gdp
);
2122 if (inode_table
< first_block
||
2123 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
2124 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2125 "Inode table for group %u not in group "
2126 "(block %llu)!", i
, inode_table
);
2129 ext4_lock_group(sb
, i
);
2130 if (!ext4_group_desc_csum_verify(sb
, i
, gdp
)) {
2131 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2132 "Checksum for group %u failed (%u!=%u)",
2133 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
2134 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
2135 if (!(sb
->s_flags
& MS_RDONLY
)) {
2136 ext4_unlock_group(sb
, i
);
2140 ext4_unlock_group(sb
, i
);
2142 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
2144 if (NULL
!= first_not_zeroed
)
2145 *first_not_zeroed
= grp
;
2147 ext4_free_blocks_count_set(sbi
->s_es
,
2148 EXT4_C2B(sbi
, ext4_count_free_clusters(sb
)));
2149 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
2153 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2154 * the superblock) which were deleted from all directories, but held open by
2155 * a process at the time of a crash. We walk the list and try to delete these
2156 * inodes at recovery time (only with a read-write filesystem).
2158 * In order to keep the orphan inode chain consistent during traversal (in
2159 * case of crash during recovery), we link each inode into the superblock
2160 * orphan list_head and handle it the same way as an inode deletion during
2161 * normal operation (which journals the operations for us).
2163 * We only do an iget() and an iput() on each inode, which is very safe if we
2164 * accidentally point at an in-use or already deleted inode. The worst that
2165 * can happen in this case is that we get a "bit already cleared" message from
2166 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2167 * e2fsck was run on this filesystem, and it must have already done the orphan
2168 * inode cleanup for us, so we can safely abort without any further action.
2170 static void ext4_orphan_cleanup(struct super_block
*sb
,
2171 struct ext4_super_block
*es
)
2173 unsigned int s_flags
= sb
->s_flags
;
2174 int nr_orphans
= 0, nr_truncates
= 0;
2178 if (!es
->s_last_orphan
) {
2179 jbd_debug(4, "no orphan inodes to clean up\n");
2183 if (bdev_read_only(sb
->s_bdev
)) {
2184 ext4_msg(sb
, KERN_ERR
, "write access "
2185 "unavailable, skipping orphan cleanup");
2189 /* Check if feature set would not allow a r/w mount */
2190 if (!ext4_feature_set_ok(sb
, 0)) {
2191 ext4_msg(sb
, KERN_INFO
, "Skipping orphan cleanup due to "
2192 "unknown ROCOMPAT features");
2196 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2197 /* don't clear list on RO mount w/ errors */
2198 if (es
->s_last_orphan
&& !(s_flags
& MS_RDONLY
)) {
2199 jbd_debug(1, "Errors on filesystem, "
2200 "clearing orphan list.\n");
2201 es
->s_last_orphan
= 0;
2203 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2207 if (s_flags
& MS_RDONLY
) {
2208 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
2209 sb
->s_flags
&= ~MS_RDONLY
;
2212 /* Needed for iput() to work correctly and not trash data */
2213 sb
->s_flags
|= MS_ACTIVE
;
2214 /* Turn on quotas so that they are updated correctly */
2215 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2216 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
2217 int ret
= ext4_quota_on_mount(sb
, i
);
2219 ext4_msg(sb
, KERN_ERR
,
2220 "Cannot turn on journaled "
2221 "quota: error %d", ret
);
2226 while (es
->s_last_orphan
) {
2227 struct inode
*inode
;
2229 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
2230 if (IS_ERR(inode
)) {
2231 es
->s_last_orphan
= 0;
2235 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
2236 dquot_initialize(inode
);
2237 if (inode
->i_nlink
) {
2238 if (test_opt(sb
, DEBUG
))
2239 ext4_msg(sb
, KERN_DEBUG
,
2240 "%s: truncating inode %lu to %lld bytes",
2241 __func__
, inode
->i_ino
, inode
->i_size
);
2242 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2243 inode
->i_ino
, inode
->i_size
);
2244 mutex_lock(&inode
->i_mutex
);
2245 truncate_inode_pages(inode
->i_mapping
, inode
->i_size
);
2246 ext4_truncate(inode
);
2247 mutex_unlock(&inode
->i_mutex
);
2250 if (test_opt(sb
, DEBUG
))
2251 ext4_msg(sb
, KERN_DEBUG
,
2252 "%s: deleting unreferenced inode %lu",
2253 __func__
, inode
->i_ino
);
2254 jbd_debug(2, "deleting unreferenced inode %lu\n",
2258 iput(inode
); /* The delete magic happens here! */
2261 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2264 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
2265 PLURAL(nr_orphans
));
2267 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
2268 PLURAL(nr_truncates
));
2270 /* Turn quotas off */
2271 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2272 if (sb_dqopt(sb
)->files
[i
])
2273 dquot_quota_off(sb
, i
);
2276 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
2280 * Maximal extent format file size.
2281 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2282 * extent format containers, within a sector_t, and within i_blocks
2283 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2284 * so that won't be a limiting factor.
2286 * However there is other limiting factor. We do store extents in the form
2287 * of starting block and length, hence the resulting length of the extent
2288 * covering maximum file size must fit into on-disk format containers as
2289 * well. Given that length is always by 1 unit bigger than max unit (because
2290 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2292 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2294 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
2297 loff_t upper_limit
= MAX_LFS_FILESIZE
;
2299 /* small i_blocks in vfs inode? */
2300 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2302 * CONFIG_LBDAF is not enabled implies the inode
2303 * i_block represent total blocks in 512 bytes
2304 * 32 == size of vfs inode i_blocks * 8
2306 upper_limit
= (1LL << 32) - 1;
2308 /* total blocks in file system block size */
2309 upper_limit
>>= (blkbits
- 9);
2310 upper_limit
<<= blkbits
;
2314 * 32-bit extent-start container, ee_block. We lower the maxbytes
2315 * by one fs block, so ee_len can cover the extent of maximum file
2318 res
= (1LL << 32) - 1;
2321 /* Sanity check against vm- & vfs- imposed limits */
2322 if (res
> upper_limit
)
2329 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2330 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2331 * We need to be 1 filesystem block less than the 2^48 sector limit.
2333 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2335 loff_t res
= EXT4_NDIR_BLOCKS
;
2338 /* This is calculated to be the largest file size for a dense, block
2339 * mapped file such that the file's total number of 512-byte sectors,
2340 * including data and all indirect blocks, does not exceed (2^48 - 1).
2342 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2343 * number of 512-byte sectors of the file.
2346 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2348 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2349 * the inode i_block field represents total file blocks in
2350 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2352 upper_limit
= (1LL << 32) - 1;
2354 /* total blocks in file system block size */
2355 upper_limit
>>= (bits
- 9);
2359 * We use 48 bit ext4_inode i_blocks
2360 * With EXT4_HUGE_FILE_FL set the i_blocks
2361 * represent total number of blocks in
2362 * file system block size
2364 upper_limit
= (1LL << 48) - 1;
2368 /* indirect blocks */
2370 /* double indirect blocks */
2371 meta_blocks
+= 1 + (1LL << (bits
-2));
2372 /* tripple indirect blocks */
2373 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2375 upper_limit
-= meta_blocks
;
2376 upper_limit
<<= bits
;
2378 res
+= 1LL << (bits
-2);
2379 res
+= 1LL << (2*(bits
-2));
2380 res
+= 1LL << (3*(bits
-2));
2382 if (res
> upper_limit
)
2385 if (res
> MAX_LFS_FILESIZE
)
2386 res
= MAX_LFS_FILESIZE
;
2391 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2392 ext4_fsblk_t logical_sb_block
, int nr
)
2394 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2395 ext4_group_t bg
, first_meta_bg
;
2398 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2400 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
2402 return logical_sb_block
+ nr
+ 1;
2403 bg
= sbi
->s_desc_per_block
* nr
;
2404 if (ext4_bg_has_super(sb
, bg
))
2407 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2411 * ext4_get_stripe_size: Get the stripe size.
2412 * @sbi: In memory super block info
2414 * If we have specified it via mount option, then
2415 * use the mount option value. If the value specified at mount time is
2416 * greater than the blocks per group use the super block value.
2417 * If the super block value is greater than blocks per group return 0.
2418 * Allocator needs it be less than blocks per group.
2421 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2423 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2424 unsigned long stripe_width
=
2425 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2428 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2429 ret
= sbi
->s_stripe
;
2430 else if (stripe_width
<= sbi
->s_blocks_per_group
)
2432 else if (stride
<= sbi
->s_blocks_per_group
)
2438 * If the stripe width is 1, this makes no sense and
2439 * we set it to 0 to turn off stripe handling code.
2450 struct attribute attr
;
2451 ssize_t (*show
)(struct ext4_attr
*, struct ext4_sb_info
*, char *);
2452 ssize_t (*store
)(struct ext4_attr
*, struct ext4_sb_info
*,
2453 const char *, size_t);
2460 static int parse_strtoull(const char *buf
,
2461 unsigned long long max
, unsigned long long *value
)
2465 ret
= kstrtoull(skip_spaces(buf
), 0, value
);
2466 if (!ret
&& *value
> max
)
2471 static ssize_t
delayed_allocation_blocks_show(struct ext4_attr
*a
,
2472 struct ext4_sb_info
*sbi
,
2475 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2477 percpu_counter_sum(&sbi
->s_dirtyclusters_counter
)));
2480 static ssize_t
session_write_kbytes_show(struct ext4_attr
*a
,
2481 struct ext4_sb_info
*sbi
, char *buf
)
2483 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2485 if (!sb
->s_bdev
->bd_part
)
2486 return snprintf(buf
, PAGE_SIZE
, "0\n");
2487 return snprintf(buf
, PAGE_SIZE
, "%lu\n",
2488 (part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2489 sbi
->s_sectors_written_start
) >> 1);
2492 static ssize_t
lifetime_write_kbytes_show(struct ext4_attr
*a
,
2493 struct ext4_sb_info
*sbi
, char *buf
)
2495 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2497 if (!sb
->s_bdev
->bd_part
)
2498 return snprintf(buf
, PAGE_SIZE
, "0\n");
2499 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2500 (unsigned long long)(sbi
->s_kbytes_written
+
2501 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2502 EXT4_SB(sb
)->s_sectors_written_start
) >> 1)));
2505 static ssize_t
inode_readahead_blks_store(struct ext4_attr
*a
,
2506 struct ext4_sb_info
*sbi
,
2507 const char *buf
, size_t count
)
2512 ret
= kstrtoul(skip_spaces(buf
), 0, &t
);
2516 if (t
&& (!is_power_of_2(t
) || t
> 0x40000000))
2519 sbi
->s_inode_readahead_blks
= t
;
2523 static ssize_t
sbi_ui_show(struct ext4_attr
*a
,
2524 struct ext4_sb_info
*sbi
, char *buf
)
2526 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->u
.offset
);
2528 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
2531 static ssize_t
sbi_ui_store(struct ext4_attr
*a
,
2532 struct ext4_sb_info
*sbi
,
2533 const char *buf
, size_t count
)
2535 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->u
.offset
);
2539 ret
= kstrtoul(skip_spaces(buf
), 0, &t
);
2546 static ssize_t
reserved_clusters_show(struct ext4_attr
*a
,
2547 struct ext4_sb_info
*sbi
, char *buf
)
2549 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2550 (unsigned long long) atomic64_read(&sbi
->s_resv_clusters
));
2553 static ssize_t
reserved_clusters_store(struct ext4_attr
*a
,
2554 struct ext4_sb_info
*sbi
,
2555 const char *buf
, size_t count
)
2557 unsigned long long val
;
2560 if (parse_strtoull(buf
, -1ULL, &val
))
2562 ret
= ext4_reserve_clusters(sbi
, val
);
2564 return ret
? ret
: count
;
2567 static ssize_t
trigger_test_error(struct ext4_attr
*a
,
2568 struct ext4_sb_info
*sbi
,
2569 const char *buf
, size_t count
)
2573 if (!capable(CAP_SYS_ADMIN
))
2576 if (len
&& buf
[len
-1] == '\n')
2580 ext4_error(sbi
->s_sb
, "%.*s", len
, buf
);
2584 static ssize_t
sbi_deprecated_show(struct ext4_attr
*a
,
2585 struct ext4_sb_info
*sbi
, char *buf
)
2587 return snprintf(buf
, PAGE_SIZE
, "%d\n", a
->u
.deprecated_val
);
2590 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2591 static struct ext4_attr ext4_attr_##_name = { \
2592 .attr = {.name = __stringify(_name), .mode = _mode }, \
2596 .offset = offsetof(struct ext4_sb_info, _elname),\
2599 #define EXT4_ATTR(name, mode, show, store) \
2600 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2602 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2603 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2604 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2605 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2606 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2607 #define ATTR_LIST(name) &ext4_attr_##name.attr
2608 #define EXT4_DEPRECATED_ATTR(_name, _val) \
2609 static struct ext4_attr ext4_attr_##_name = { \
2610 .attr = {.name = __stringify(_name), .mode = 0444 }, \
2611 .show = sbi_deprecated_show, \
2613 .deprecated_val = _val, \
2617 EXT4_RO_ATTR(delayed_allocation_blocks
);
2618 EXT4_RO_ATTR(session_write_kbytes
);
2619 EXT4_RO_ATTR(lifetime_write_kbytes
);
2620 EXT4_RW_ATTR(reserved_clusters
);
2621 EXT4_ATTR_OFFSET(inode_readahead_blks
, 0644, sbi_ui_show
,
2622 inode_readahead_blks_store
, s_inode_readahead_blks
);
2623 EXT4_RW_ATTR_SBI_UI(inode_goal
, s_inode_goal
);
2624 EXT4_RW_ATTR_SBI_UI(mb_stats
, s_mb_stats
);
2625 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan
, s_mb_max_to_scan
);
2626 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan
, s_mb_min_to_scan
);
2627 EXT4_RW_ATTR_SBI_UI(mb_order2_req
, s_mb_order2_reqs
);
2628 EXT4_RW_ATTR_SBI_UI(mb_stream_req
, s_mb_stream_request
);
2629 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc
, s_mb_group_prealloc
);
2630 EXT4_DEPRECATED_ATTR(max_writeback_mb_bump
, 128);
2631 EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb
, s_extent_max_zeroout_kb
);
2632 EXT4_ATTR(trigger_fs_error
, 0200, NULL
, trigger_test_error
);
2633 EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms
, s_err_ratelimit_state
.interval
);
2634 EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst
, s_err_ratelimit_state
.burst
);
2635 EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms
, s_warning_ratelimit_state
.interval
);
2636 EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst
, s_warning_ratelimit_state
.burst
);
2637 EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms
, s_msg_ratelimit_state
.interval
);
2638 EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst
, s_msg_ratelimit_state
.burst
);
2640 static struct attribute
*ext4_attrs
[] = {
2641 ATTR_LIST(delayed_allocation_blocks
),
2642 ATTR_LIST(session_write_kbytes
),
2643 ATTR_LIST(lifetime_write_kbytes
),
2644 ATTR_LIST(reserved_clusters
),
2645 ATTR_LIST(inode_readahead_blks
),
2646 ATTR_LIST(inode_goal
),
2647 ATTR_LIST(mb_stats
),
2648 ATTR_LIST(mb_max_to_scan
),
2649 ATTR_LIST(mb_min_to_scan
),
2650 ATTR_LIST(mb_order2_req
),
2651 ATTR_LIST(mb_stream_req
),
2652 ATTR_LIST(mb_group_prealloc
),
2653 ATTR_LIST(max_writeback_mb_bump
),
2654 ATTR_LIST(extent_max_zeroout_kb
),
2655 ATTR_LIST(trigger_fs_error
),
2656 ATTR_LIST(err_ratelimit_interval_ms
),
2657 ATTR_LIST(err_ratelimit_burst
),
2658 ATTR_LIST(warning_ratelimit_interval_ms
),
2659 ATTR_LIST(warning_ratelimit_burst
),
2660 ATTR_LIST(msg_ratelimit_interval_ms
),
2661 ATTR_LIST(msg_ratelimit_burst
),
2665 /* Features this copy of ext4 supports */
2666 EXT4_INFO_ATTR(lazy_itable_init
);
2667 EXT4_INFO_ATTR(batched_discard
);
2668 EXT4_INFO_ATTR(meta_bg_resize
);
2670 static struct attribute
*ext4_feat_attrs
[] = {
2671 ATTR_LIST(lazy_itable_init
),
2672 ATTR_LIST(batched_discard
),
2673 ATTR_LIST(meta_bg_resize
),
2677 static ssize_t
ext4_attr_show(struct kobject
*kobj
,
2678 struct attribute
*attr
, char *buf
)
2680 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2682 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2684 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
2687 static ssize_t
ext4_attr_store(struct kobject
*kobj
,
2688 struct attribute
*attr
,
2689 const char *buf
, size_t len
)
2691 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2693 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2695 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
2698 static void ext4_sb_release(struct kobject
*kobj
)
2700 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2702 complete(&sbi
->s_kobj_unregister
);
2705 static const struct sysfs_ops ext4_attr_ops
= {
2706 .show
= ext4_attr_show
,
2707 .store
= ext4_attr_store
,
2710 static struct kobj_type ext4_ktype
= {
2711 .default_attrs
= ext4_attrs
,
2712 .sysfs_ops
= &ext4_attr_ops
,
2713 .release
= ext4_sb_release
,
2716 static void ext4_feat_release(struct kobject
*kobj
)
2718 complete(&ext4_feat
->f_kobj_unregister
);
2721 static struct kobj_type ext4_feat_ktype
= {
2722 .default_attrs
= ext4_feat_attrs
,
2723 .sysfs_ops
= &ext4_attr_ops
,
2724 .release
= ext4_feat_release
,
2728 * Check whether this filesystem can be mounted based on
2729 * the features present and the RDONLY/RDWR mount requested.
2730 * Returns 1 if this filesystem can be mounted as requested,
2731 * 0 if it cannot be.
2733 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2735 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
)) {
2736 ext4_msg(sb
, KERN_ERR
,
2737 "Couldn't mount because of "
2738 "unsupported optional features (%x)",
2739 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2740 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2747 /* Check that feature set is OK for a read-write mount */
2748 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
)) {
2749 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2750 "unsupported optional features (%x)",
2751 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2752 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2756 * Large file size enabled file system can only be mounted
2757 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2759 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
2760 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2761 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2762 "cannot be mounted RDWR without "
2767 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_BIGALLOC
) &&
2768 !EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_EXTENTS
)) {
2769 ext4_msg(sb
, KERN_ERR
,
2770 "Can't support bigalloc feature without "
2771 "extents feature\n");
2775 #ifndef CONFIG_QUOTA
2776 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
) &&
2778 ext4_msg(sb
, KERN_ERR
,
2779 "Filesystem with quota feature cannot be mounted RDWR "
2780 "without CONFIG_QUOTA");
2783 #endif /* CONFIG_QUOTA */
2788 * This function is called once a day if we have errors logged
2789 * on the file system
2791 static void print_daily_error_info(unsigned long arg
)
2793 struct super_block
*sb
= (struct super_block
*) arg
;
2794 struct ext4_sb_info
*sbi
;
2795 struct ext4_super_block
*es
;
2800 if (es
->s_error_count
)
2801 ext4_msg(sb
, KERN_NOTICE
, "error count: %u",
2802 le32_to_cpu(es
->s_error_count
));
2803 if (es
->s_first_error_time
) {
2804 printk(KERN_NOTICE
"EXT4-fs (%s): initial error at %u: %.*s:%d",
2805 sb
->s_id
, le32_to_cpu(es
->s_first_error_time
),
2806 (int) sizeof(es
->s_first_error_func
),
2807 es
->s_first_error_func
,
2808 le32_to_cpu(es
->s_first_error_line
));
2809 if (es
->s_first_error_ino
)
2810 printk(": inode %u",
2811 le32_to_cpu(es
->s_first_error_ino
));
2812 if (es
->s_first_error_block
)
2813 printk(": block %llu", (unsigned long long)
2814 le64_to_cpu(es
->s_first_error_block
));
2817 if (es
->s_last_error_time
) {
2818 printk(KERN_NOTICE
"EXT4-fs (%s): last error at %u: %.*s:%d",
2819 sb
->s_id
, le32_to_cpu(es
->s_last_error_time
),
2820 (int) sizeof(es
->s_last_error_func
),
2821 es
->s_last_error_func
,
2822 le32_to_cpu(es
->s_last_error_line
));
2823 if (es
->s_last_error_ino
)
2824 printk(": inode %u",
2825 le32_to_cpu(es
->s_last_error_ino
));
2826 if (es
->s_last_error_block
)
2827 printk(": block %llu", (unsigned long long)
2828 le64_to_cpu(es
->s_last_error_block
));
2831 mod_timer(&sbi
->s_err_report
, jiffies
+ 24*60*60*HZ
); /* Once a day */
2834 /* Find next suitable group and run ext4_init_inode_table */
2835 static int ext4_run_li_request(struct ext4_li_request
*elr
)
2837 struct ext4_group_desc
*gdp
= NULL
;
2838 ext4_group_t group
, ngroups
;
2839 struct super_block
*sb
;
2840 unsigned long timeout
= 0;
2844 ngroups
= EXT4_SB(sb
)->s_groups_count
;
2847 for (group
= elr
->lr_next_group
; group
< ngroups
; group
++) {
2848 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2854 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2858 if (group
>= ngroups
)
2863 ret
= ext4_init_inode_table(sb
, group
,
2864 elr
->lr_timeout
? 0 : 1);
2865 if (elr
->lr_timeout
== 0) {
2866 timeout
= (jiffies
- timeout
) *
2867 elr
->lr_sbi
->s_li_wait_mult
;
2868 elr
->lr_timeout
= timeout
;
2870 elr
->lr_next_sched
= jiffies
+ elr
->lr_timeout
;
2871 elr
->lr_next_group
= group
+ 1;
2879 * Remove lr_request from the list_request and free the
2880 * request structure. Should be called with li_list_mtx held
2882 static void ext4_remove_li_request(struct ext4_li_request
*elr
)
2884 struct ext4_sb_info
*sbi
;
2891 list_del(&elr
->lr_request
);
2892 sbi
->s_li_request
= NULL
;
2896 static void ext4_unregister_li_request(struct super_block
*sb
)
2898 mutex_lock(&ext4_li_mtx
);
2899 if (!ext4_li_info
) {
2900 mutex_unlock(&ext4_li_mtx
);
2904 mutex_lock(&ext4_li_info
->li_list_mtx
);
2905 ext4_remove_li_request(EXT4_SB(sb
)->s_li_request
);
2906 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2907 mutex_unlock(&ext4_li_mtx
);
2910 static struct task_struct
*ext4_lazyinit_task
;
2913 * This is the function where ext4lazyinit thread lives. It walks
2914 * through the request list searching for next scheduled filesystem.
2915 * When such a fs is found, run the lazy initialization request
2916 * (ext4_rn_li_request) and keep track of the time spend in this
2917 * function. Based on that time we compute next schedule time of
2918 * the request. When walking through the list is complete, compute
2919 * next waking time and put itself into sleep.
2921 static int ext4_lazyinit_thread(void *arg
)
2923 struct ext4_lazy_init
*eli
= (struct ext4_lazy_init
*)arg
;
2924 struct list_head
*pos
, *n
;
2925 struct ext4_li_request
*elr
;
2926 unsigned long next_wakeup
, cur
;
2928 BUG_ON(NULL
== eli
);
2932 next_wakeup
= MAX_JIFFY_OFFSET
;
2934 mutex_lock(&eli
->li_list_mtx
);
2935 if (list_empty(&eli
->li_request_list
)) {
2936 mutex_unlock(&eli
->li_list_mtx
);
2940 list_for_each_safe(pos
, n
, &eli
->li_request_list
) {
2941 elr
= list_entry(pos
, struct ext4_li_request
,
2944 if (time_after_eq(jiffies
, elr
->lr_next_sched
)) {
2945 if (ext4_run_li_request(elr
) != 0) {
2946 /* error, remove the lazy_init job */
2947 ext4_remove_li_request(elr
);
2952 if (time_before(elr
->lr_next_sched
, next_wakeup
))
2953 next_wakeup
= elr
->lr_next_sched
;
2955 mutex_unlock(&eli
->li_list_mtx
);
2960 if ((time_after_eq(cur
, next_wakeup
)) ||
2961 (MAX_JIFFY_OFFSET
== next_wakeup
)) {
2966 schedule_timeout_interruptible(next_wakeup
- cur
);
2968 if (kthread_should_stop()) {
2969 ext4_clear_request_list();
2976 * It looks like the request list is empty, but we need
2977 * to check it under the li_list_mtx lock, to prevent any
2978 * additions into it, and of course we should lock ext4_li_mtx
2979 * to atomically free the list and ext4_li_info, because at
2980 * this point another ext4 filesystem could be registering
2983 mutex_lock(&ext4_li_mtx
);
2984 mutex_lock(&eli
->li_list_mtx
);
2985 if (!list_empty(&eli
->li_request_list
)) {
2986 mutex_unlock(&eli
->li_list_mtx
);
2987 mutex_unlock(&ext4_li_mtx
);
2990 mutex_unlock(&eli
->li_list_mtx
);
2991 kfree(ext4_li_info
);
2992 ext4_li_info
= NULL
;
2993 mutex_unlock(&ext4_li_mtx
);
2998 static void ext4_clear_request_list(void)
3000 struct list_head
*pos
, *n
;
3001 struct ext4_li_request
*elr
;
3003 mutex_lock(&ext4_li_info
->li_list_mtx
);
3004 list_for_each_safe(pos
, n
, &ext4_li_info
->li_request_list
) {
3005 elr
= list_entry(pos
, struct ext4_li_request
,
3007 ext4_remove_li_request(elr
);
3009 mutex_unlock(&ext4_li_info
->li_list_mtx
);
3012 static int ext4_run_lazyinit_thread(void)
3014 ext4_lazyinit_task
= kthread_run(ext4_lazyinit_thread
,
3015 ext4_li_info
, "ext4lazyinit");
3016 if (IS_ERR(ext4_lazyinit_task
)) {
3017 int err
= PTR_ERR(ext4_lazyinit_task
);
3018 ext4_clear_request_list();
3019 kfree(ext4_li_info
);
3020 ext4_li_info
= NULL
;
3021 printk(KERN_CRIT
"EXT4-fs: error %d creating inode table "
3022 "initialization thread\n",
3026 ext4_li_info
->li_state
|= EXT4_LAZYINIT_RUNNING
;
3031 * Check whether it make sense to run itable init. thread or not.
3032 * If there is at least one uninitialized inode table, return
3033 * corresponding group number, else the loop goes through all
3034 * groups and return total number of groups.
3036 static ext4_group_t
ext4_has_uninit_itable(struct super_block
*sb
)
3038 ext4_group_t group
, ngroups
= EXT4_SB(sb
)->s_groups_count
;
3039 struct ext4_group_desc
*gdp
= NULL
;
3041 for (group
= 0; group
< ngroups
; group
++) {
3042 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
3046 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
3053 static int ext4_li_info_new(void)
3055 struct ext4_lazy_init
*eli
= NULL
;
3057 eli
= kzalloc(sizeof(*eli
), GFP_KERNEL
);
3061 INIT_LIST_HEAD(&eli
->li_request_list
);
3062 mutex_init(&eli
->li_list_mtx
);
3064 eli
->li_state
|= EXT4_LAZYINIT_QUIT
;
3071 static struct ext4_li_request
*ext4_li_request_new(struct super_block
*sb
,
3074 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3075 struct ext4_li_request
*elr
;
3077 elr
= kzalloc(sizeof(*elr
), GFP_KERNEL
);
3083 elr
->lr_next_group
= start
;
3086 * Randomize first schedule time of the request to
3087 * spread the inode table initialization requests
3090 elr
->lr_next_sched
= jiffies
+ (prandom_u32() %
3091 (EXT4_DEF_LI_MAX_START_DELAY
* HZ
));
3095 int ext4_register_li_request(struct super_block
*sb
,
3096 ext4_group_t first_not_zeroed
)
3098 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3099 struct ext4_li_request
*elr
= NULL
;
3100 ext4_group_t ngroups
= EXT4_SB(sb
)->s_groups_count
;
3103 mutex_lock(&ext4_li_mtx
);
3104 if (sbi
->s_li_request
!= NULL
) {
3106 * Reset timeout so it can be computed again, because
3107 * s_li_wait_mult might have changed.
3109 sbi
->s_li_request
->lr_timeout
= 0;
3113 if (first_not_zeroed
== ngroups
||
3114 (sb
->s_flags
& MS_RDONLY
) ||
3115 !test_opt(sb
, INIT_INODE_TABLE
))
3118 elr
= ext4_li_request_new(sb
, first_not_zeroed
);
3124 if (NULL
== ext4_li_info
) {
3125 ret
= ext4_li_info_new();
3130 mutex_lock(&ext4_li_info
->li_list_mtx
);
3131 list_add(&elr
->lr_request
, &ext4_li_info
->li_request_list
);
3132 mutex_unlock(&ext4_li_info
->li_list_mtx
);
3134 sbi
->s_li_request
= elr
;
3136 * set elr to NULL here since it has been inserted to
3137 * the request_list and the removal and free of it is
3138 * handled by ext4_clear_request_list from now on.
3142 if (!(ext4_li_info
->li_state
& EXT4_LAZYINIT_RUNNING
)) {
3143 ret
= ext4_run_lazyinit_thread();
3148 mutex_unlock(&ext4_li_mtx
);
3155 * We do not need to lock anything since this is called on
3158 static void ext4_destroy_lazyinit_thread(void)
3161 * If thread exited earlier
3162 * there's nothing to be done.
3164 if (!ext4_li_info
|| !ext4_lazyinit_task
)
3167 kthread_stop(ext4_lazyinit_task
);
3170 static int set_journal_csum_feature_set(struct super_block
*sb
)
3173 int compat
, incompat
;
3174 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3176 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3177 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
)) {
3178 /* journal checksum v2 */
3180 incompat
= JBD2_FEATURE_INCOMPAT_CSUM_V2
;
3182 /* journal checksum v1 */
3183 compat
= JBD2_FEATURE_COMPAT_CHECKSUM
;
3187 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
3188 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3190 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
|
3192 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
3193 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3196 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3197 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3199 jbd2_journal_clear_features(sbi
->s_journal
,
3200 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
3201 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
|
3202 JBD2_FEATURE_INCOMPAT_CSUM_V2
);
3209 * Note: calculating the overhead so we can be compatible with
3210 * historical BSD practice is quite difficult in the face of
3211 * clusters/bigalloc. This is because multiple metadata blocks from
3212 * different block group can end up in the same allocation cluster.
3213 * Calculating the exact overhead in the face of clustered allocation
3214 * requires either O(all block bitmaps) in memory or O(number of block
3215 * groups**2) in time. We will still calculate the superblock for
3216 * older file systems --- and if we come across with a bigalloc file
3217 * system with zero in s_overhead_clusters the estimate will be close to
3218 * correct especially for very large cluster sizes --- but for newer
3219 * file systems, it's better to calculate this figure once at mkfs
3220 * time, and store it in the superblock. If the superblock value is
3221 * present (even for non-bigalloc file systems), we will use it.
3223 static int count_overhead(struct super_block
*sb
, ext4_group_t grp
,
3226 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3227 struct ext4_group_desc
*gdp
;
3228 ext4_fsblk_t first_block
, last_block
, b
;
3229 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3230 int s
, j
, count
= 0;
3232 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_BIGALLOC
))
3233 return (ext4_bg_has_super(sb
, grp
) + ext4_bg_num_gdb(sb
, grp
) +
3234 sbi
->s_itb_per_group
+ 2);
3236 first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
) +
3237 (grp
* EXT4_BLOCKS_PER_GROUP(sb
));
3238 last_block
= first_block
+ EXT4_BLOCKS_PER_GROUP(sb
) - 1;
3239 for (i
= 0; i
< ngroups
; i
++) {
3240 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
3241 b
= ext4_block_bitmap(sb
, gdp
);
3242 if (b
>= first_block
&& b
<= last_block
) {
3243 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3246 b
= ext4_inode_bitmap(sb
, gdp
);
3247 if (b
>= first_block
&& b
<= last_block
) {
3248 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3251 b
= ext4_inode_table(sb
, gdp
);
3252 if (b
>= first_block
&& b
+ sbi
->s_itb_per_group
<= last_block
)
3253 for (j
= 0; j
< sbi
->s_itb_per_group
; j
++, b
++) {
3254 int c
= EXT4_B2C(sbi
, b
- first_block
);
3255 ext4_set_bit(c
, buf
);
3261 if (ext4_bg_has_super(sb
, grp
)) {
3262 ext4_set_bit(s
++, buf
);
3265 for (j
= ext4_bg_num_gdb(sb
, grp
); j
> 0; j
--) {
3266 ext4_set_bit(EXT4_B2C(sbi
, s
++), buf
);
3272 return EXT4_CLUSTERS_PER_GROUP(sb
) -
3273 ext4_count_free(buf
, EXT4_CLUSTERS_PER_GROUP(sb
) / 8);
3277 * Compute the overhead and stash it in sbi->s_overhead
3279 int ext4_calculate_overhead(struct super_block
*sb
)
3281 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3282 struct ext4_super_block
*es
= sbi
->s_es
;
3283 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3284 ext4_fsblk_t overhead
= 0;
3285 char *buf
= (char *) get_zeroed_page(GFP_KERNEL
);
3291 * Compute the overhead (FS structures). This is constant
3292 * for a given filesystem unless the number of block groups
3293 * changes so we cache the previous value until it does.
3297 * All of the blocks before first_data_block are overhead
3299 overhead
= EXT4_B2C(sbi
, le32_to_cpu(es
->s_first_data_block
));
3302 * Add the overhead found in each block group
3304 for (i
= 0; i
< ngroups
; i
++) {
3307 blks
= count_overhead(sb
, i
, buf
);
3310 memset(buf
, 0, PAGE_SIZE
);
3313 /* Add the journal blocks as well */
3315 overhead
+= EXT4_NUM_B2C(sbi
, sbi
->s_journal
->j_maxlen
);
3317 sbi
->s_overhead
= overhead
;
3319 free_page((unsigned long) buf
);
3324 static ext4_fsblk_t
ext4_calculate_resv_clusters(struct super_block
*sb
)
3326 ext4_fsblk_t resv_clusters
;
3329 * There's no need to reserve anything when we aren't using extents.
3330 * The space estimates are exact, there are no unwritten extents,
3331 * hole punching doesn't need new metadata... This is needed especially
3332 * to keep ext2/3 backward compatibility.
3334 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_EXTENTS
))
3337 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3338 * This should cover the situations where we can not afford to run
3339 * out of space like for example punch hole, or converting
3340 * uninitialized extents in delalloc path. In most cases such
3341 * allocation would require 1, or 2 blocks, higher numbers are
3344 resv_clusters
= ext4_blocks_count(EXT4_SB(sb
)->s_es
) >>
3345 EXT4_SB(sb
)->s_cluster_bits
;
3347 do_div(resv_clusters
, 50);
3348 resv_clusters
= min_t(ext4_fsblk_t
, resv_clusters
, 4096);
3350 return resv_clusters
;
3354 static int ext4_reserve_clusters(struct ext4_sb_info
*sbi
, ext4_fsblk_t count
)
3356 ext4_fsblk_t clusters
= ext4_blocks_count(sbi
->s_es
) >>
3357 sbi
->s_cluster_bits
;
3359 if (count
>= clusters
)
3362 atomic64_set(&sbi
->s_resv_clusters
, count
);
3366 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
3368 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
3369 struct buffer_head
*bh
;
3370 struct ext4_super_block
*es
= NULL
;
3371 struct ext4_sb_info
*sbi
;
3373 ext4_fsblk_t sb_block
= get_sb_block(&data
);
3374 ext4_fsblk_t logical_sb_block
;
3375 unsigned long offset
= 0;
3376 unsigned long journal_devnum
= 0;
3377 unsigned long def_mount_opts
;
3382 int blocksize
, clustersize
;
3383 unsigned int db_count
;
3385 int needs_recovery
, has_huge_files
, has_bigalloc
;
3388 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3389 ext4_group_t first_not_zeroed
;
3391 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
3395 sbi
->s_blockgroup_lock
=
3396 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
3397 if (!sbi
->s_blockgroup_lock
) {
3401 sb
->s_fs_info
= sbi
;
3403 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
3404 sbi
->s_sb_block
= sb_block
;
3405 if (sb
->s_bdev
->bd_part
)
3406 sbi
->s_sectors_written_start
=
3407 part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]);
3409 /* Cleanup superblock name */
3410 for (cp
= sb
->s_id
; (cp
= strchr(cp
, '/'));)
3413 /* -EINVAL is default */
3415 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
3417 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
3422 * The ext4 superblock will not be buffer aligned for other than 1kB
3423 * block sizes. We need to calculate the offset from buffer start.
3425 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
3426 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3427 offset
= do_div(logical_sb_block
, blocksize
);
3429 logical_sb_block
= sb_block
;
3432 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
3433 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
3437 * Note: s_es must be initialized as soon as possible because
3438 * some ext4 macro-instructions depend on its value
3440 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
3442 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
3443 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
3445 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
3447 /* Warn if metadata_csum and gdt_csum are both set. */
3448 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3449 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
) &&
3450 EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_GDT_CSUM
))
3451 ext4_warning(sb
, KERN_INFO
"metadata_csum and uninit_bg are "
3452 "redundant flags; please run fsck.");
3454 /* Check for a known checksum algorithm */
3455 if (!ext4_verify_csum_type(sb
, es
)) {
3456 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3457 "unknown checksum algorithm.");
3462 /* Load the checksum driver */
3463 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3464 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
)) {
3465 sbi
->s_chksum_driver
= crypto_alloc_shash("crc32c", 0, 0);
3466 if (IS_ERR(sbi
->s_chksum_driver
)) {
3467 ext4_msg(sb
, KERN_ERR
, "Cannot load crc32c driver.");
3468 ret
= PTR_ERR(sbi
->s_chksum_driver
);
3469 sbi
->s_chksum_driver
= NULL
;
3474 /* Check superblock checksum */
3475 if (!ext4_superblock_csum_verify(sb
, es
)) {
3476 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3477 "invalid superblock checksum. Run e2fsck?");
3482 /* Precompute checksum seed for all metadata */
3483 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3484 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))
3485 sbi
->s_csum_seed
= ext4_chksum(sbi
, ~0, es
->s_uuid
,
3486 sizeof(es
->s_uuid
));
3488 /* Set defaults before we parse the mount options */
3489 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
3490 set_opt(sb
, INIT_INODE_TABLE
);
3491 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
3493 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
3495 if (def_mount_opts
& EXT4_DEFM_UID16
)
3496 set_opt(sb
, NO_UID32
);
3497 /* xattr user namespace & acls are now defaulted on */
3498 set_opt(sb
, XATTR_USER
);
3499 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3500 set_opt(sb
, POSIX_ACL
);
3502 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
3503 set_opt(sb
, JOURNAL_DATA
);
3504 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
3505 set_opt(sb
, ORDERED_DATA
);
3506 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
3507 set_opt(sb
, WRITEBACK_DATA
);
3509 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
3510 set_opt(sb
, ERRORS_PANIC
);
3511 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
3512 set_opt(sb
, ERRORS_CONT
);
3514 set_opt(sb
, ERRORS_RO
);
3515 if (def_mount_opts
& EXT4_DEFM_BLOCK_VALIDITY
)
3516 set_opt(sb
, BLOCK_VALIDITY
);
3517 if (def_mount_opts
& EXT4_DEFM_DISCARD
)
3518 set_opt(sb
, DISCARD
);
3520 sbi
->s_resuid
= make_kuid(&init_user_ns
, le16_to_cpu(es
->s_def_resuid
));
3521 sbi
->s_resgid
= make_kgid(&init_user_ns
, le16_to_cpu(es
->s_def_resgid
));
3522 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
3523 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
3524 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
3526 if ((def_mount_opts
& EXT4_DEFM_NOBARRIER
) == 0)
3527 set_opt(sb
, BARRIER
);
3530 * enable delayed allocation by default
3531 * Use -o nodelalloc to turn it off
3533 if (!IS_EXT3_SB(sb
) && !IS_EXT2_SB(sb
) &&
3534 ((def_mount_opts
& EXT4_DEFM_NODELALLOC
) == 0))
3535 set_opt(sb
, DELALLOC
);
3538 * set default s_li_wait_mult for lazyinit, for the case there is
3539 * no mount option specified.
3541 sbi
->s_li_wait_mult
= EXT4_DEF_LI_WAIT_MULT
;
3543 if (!parse_options((char *) sbi
->s_es
->s_mount_opts
, sb
,
3544 &journal_devnum
, &journal_ioprio
, 0)) {
3545 ext4_msg(sb
, KERN_WARNING
,
3546 "failed to parse options in superblock: %s",
3547 sbi
->s_es
->s_mount_opts
);
3549 sbi
->s_def_mount_opt
= sbi
->s_mount_opt
;
3550 if (!parse_options((char *) data
, sb
, &journal_devnum
,
3551 &journal_ioprio
, 0))
3554 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
3555 printk_once(KERN_WARNING
"EXT4-fs: Warning: mounting "
3556 "with data=journal disables delayed "
3557 "allocation and O_DIRECT support!\n");
3558 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
3559 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3560 "both data=journal and delalloc");
3563 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
3564 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3565 "both data=journal and dioread_nolock");
3568 if (test_opt(sb
, DELALLOC
))
3569 clear_opt(sb
, DELALLOC
);
3572 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3573 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
3575 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
3576 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
3577 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
3578 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
3579 ext4_msg(sb
, KERN_WARNING
,
3580 "feature flags set on rev 0 fs, "
3581 "running e2fsck is recommended");
3583 if (es
->s_creator_os
== cpu_to_le32(EXT4_OS_HURD
)) {
3584 set_opt2(sb
, HURD_COMPAT
);
3585 if (EXT4_HAS_INCOMPAT_FEATURE(sb
,
3586 EXT4_FEATURE_INCOMPAT_64BIT
)) {
3587 ext4_msg(sb
, KERN_ERR
,
3588 "The Hurd can't support 64-bit file systems");
3593 if (IS_EXT2_SB(sb
)) {
3594 if (ext2_feature_set_ok(sb
))
3595 ext4_msg(sb
, KERN_INFO
, "mounting ext2 file system "
3596 "using the ext4 subsystem");
3598 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext2 due "
3599 "to feature incompatibilities");
3604 if (IS_EXT3_SB(sb
)) {
3605 if (ext3_feature_set_ok(sb
))
3606 ext4_msg(sb
, KERN_INFO
, "mounting ext3 file system "
3607 "using the ext4 subsystem");
3609 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext3 due "
3610 "to feature incompatibilities");
3616 * Check feature flags regardless of the revision level, since we
3617 * previously didn't change the revision level when setting the flags,
3618 * so there is a chance incompat flags are set on a rev 0 filesystem.
3620 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
3623 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
3624 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
3625 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
3626 ext4_msg(sb
, KERN_ERR
,
3627 "Unsupported filesystem blocksize %d", blocksize
);
3631 if (sb
->s_blocksize
!= blocksize
) {
3632 /* Validate the filesystem blocksize */
3633 if (!sb_set_blocksize(sb
, blocksize
)) {
3634 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
3640 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3641 offset
= do_div(logical_sb_block
, blocksize
);
3642 bh
= sb_bread(sb
, logical_sb_block
);
3644 ext4_msg(sb
, KERN_ERR
,
3645 "Can't read superblock on 2nd try");
3648 es
= (struct ext4_super_block
*)(bh
->b_data
+ offset
);
3650 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
3651 ext4_msg(sb
, KERN_ERR
,
3652 "Magic mismatch, very weird!");
3657 has_huge_files
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3658 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
);
3659 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
3661 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
3663 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
3664 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
3665 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
3667 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
3668 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
3669 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
3670 (!is_power_of_2(sbi
->s_inode_size
)) ||
3671 (sbi
->s_inode_size
> blocksize
)) {
3672 ext4_msg(sb
, KERN_ERR
,
3673 "unsupported inode size: %d",
3677 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
3678 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
3681 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
3682 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
3683 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
3684 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
3685 !is_power_of_2(sbi
->s_desc_size
)) {
3686 ext4_msg(sb
, KERN_ERR
,
3687 "unsupported descriptor size %lu",
3692 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
3694 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
3695 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
3696 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
3699 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
3700 if (sbi
->s_inodes_per_block
== 0)
3702 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
3703 sbi
->s_inodes_per_block
;
3704 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
3706 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3707 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
3708 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
3710 for (i
= 0; i
< 4; i
++)
3711 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
3712 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
3713 if (EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_DIR_INDEX
)) {
3714 i
= le32_to_cpu(es
->s_flags
);
3715 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
3716 sbi
->s_hash_unsigned
= 3;
3717 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
3718 #ifdef __CHAR_UNSIGNED__
3719 if (!(sb
->s_flags
& MS_RDONLY
))
3721 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
3722 sbi
->s_hash_unsigned
= 3;
3724 if (!(sb
->s_flags
& MS_RDONLY
))
3726 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
3731 /* Handle clustersize */
3732 clustersize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_cluster_size
);
3733 has_bigalloc
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3734 EXT4_FEATURE_RO_COMPAT_BIGALLOC
);
3736 if (clustersize
< blocksize
) {
3737 ext4_msg(sb
, KERN_ERR
,
3738 "cluster size (%d) smaller than "
3739 "block size (%d)", clustersize
, blocksize
);
3742 sbi
->s_cluster_bits
= le32_to_cpu(es
->s_log_cluster_size
) -
3743 le32_to_cpu(es
->s_log_block_size
);
3744 sbi
->s_clusters_per_group
=
3745 le32_to_cpu(es
->s_clusters_per_group
);
3746 if (sbi
->s_clusters_per_group
> blocksize
* 8) {
3747 ext4_msg(sb
, KERN_ERR
,
3748 "#clusters per group too big: %lu",
3749 sbi
->s_clusters_per_group
);
3752 if (sbi
->s_blocks_per_group
!=
3753 (sbi
->s_clusters_per_group
* (clustersize
/ blocksize
))) {
3754 ext4_msg(sb
, KERN_ERR
, "blocks per group (%lu) and "
3755 "clusters per group (%lu) inconsistent",
3756 sbi
->s_blocks_per_group
,
3757 sbi
->s_clusters_per_group
);
3761 if (clustersize
!= blocksize
) {
3762 ext4_warning(sb
, "fragment/cluster size (%d) != "
3763 "block size (%d)", clustersize
,
3765 clustersize
= blocksize
;
3767 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
3768 ext4_msg(sb
, KERN_ERR
,
3769 "#blocks per group too big: %lu",
3770 sbi
->s_blocks_per_group
);
3773 sbi
->s_clusters_per_group
= sbi
->s_blocks_per_group
;
3774 sbi
->s_cluster_bits
= 0;
3776 sbi
->s_cluster_ratio
= clustersize
/ blocksize
;
3778 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
3779 ext4_msg(sb
, KERN_ERR
,
3780 "#inodes per group too big: %lu",
3781 sbi
->s_inodes_per_group
);
3785 /* Do we have standard group size of clustersize * 8 blocks ? */
3786 if (sbi
->s_blocks_per_group
== clustersize
<< 3)
3787 set_opt2(sb
, STD_GROUP_SIZE
);
3790 * Test whether we have more sectors than will fit in sector_t,
3791 * and whether the max offset is addressable by the page cache.
3793 err
= generic_check_addressable(sb
->s_blocksize_bits
,
3794 ext4_blocks_count(es
));
3796 ext4_msg(sb
, KERN_ERR
, "filesystem"
3797 " too large to mount safely on this system");
3798 if (sizeof(sector_t
) < 8)
3799 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
3803 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
3806 /* check blocks count against device size */
3807 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
3808 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
3809 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
3810 "exceeds size of device (%llu blocks)",
3811 ext4_blocks_count(es
), blocks_count
);
3816 * It makes no sense for the first data block to be beyond the end
3817 * of the filesystem.
3819 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
3820 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data "
3821 "block %u is beyond end of filesystem (%llu)",
3822 le32_to_cpu(es
->s_first_data_block
),
3823 ext4_blocks_count(es
));
3826 blocks_count
= (ext4_blocks_count(es
) -
3827 le32_to_cpu(es
->s_first_data_block
) +
3828 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
3829 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
3830 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
3831 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
3832 "(block count %llu, first data block %u, "
3833 "blocks per group %lu)", sbi
->s_groups_count
,
3834 ext4_blocks_count(es
),
3835 le32_to_cpu(es
->s_first_data_block
),
3836 EXT4_BLOCKS_PER_GROUP(sb
));
3839 sbi
->s_groups_count
= blocks_count
;
3840 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
3841 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
3842 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
3843 EXT4_DESC_PER_BLOCK(sb
);
3844 sbi
->s_group_desc
= ext4_kvmalloc(db_count
*
3845 sizeof(struct buffer_head
*),
3847 if (sbi
->s_group_desc
== NULL
) {
3848 ext4_msg(sb
, KERN_ERR
, "not enough memory");
3854 sbi
->s_proc
= proc_mkdir(sb
->s_id
, ext4_proc_root
);
3857 proc_create_data("options", S_IRUGO
, sbi
->s_proc
,
3858 &ext4_seq_options_fops
, sb
);
3860 bgl_lock_init(sbi
->s_blockgroup_lock
);
3862 for (i
= 0; i
< db_count
; i
++) {
3863 block
= descriptor_loc(sb
, logical_sb_block
, i
);
3864 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
3865 if (!sbi
->s_group_desc
[i
]) {
3866 ext4_msg(sb
, KERN_ERR
,
3867 "can't read group descriptor %d", i
);
3874 * set up enough so that it can read an inode,
3875 * and create new inode for buddy allocator
3877 sbi
->s_gdb_count
= db_count
;
3878 if (!test_opt(sb
, NOLOAD
) &&
3879 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
3880 sb
->s_op
= &ext4_sops
;
3882 sb
->s_op
= &ext4_nojournal_sops
;
3885 err
= ext4_mb_init(sb
);
3887 ext4_msg(sb
, KERN_ERR
, "failed to initialize mballoc (%d)",
3892 if (!ext4_check_descriptors(sb
, &first_not_zeroed
)) {
3893 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
3894 goto failed_mount2a
;
3896 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
3897 if (!ext4_fill_flex_info(sb
)) {
3898 ext4_msg(sb
, KERN_ERR
,
3899 "unable to initialize "
3900 "flex_bg meta info!");
3901 goto failed_mount2a
;
3904 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
3905 spin_lock_init(&sbi
->s_next_gen_lock
);
3907 init_timer(&sbi
->s_err_report
);
3908 sbi
->s_err_report
.function
= print_daily_error_info
;
3909 sbi
->s_err_report
.data
= (unsigned long) sb
;
3911 /* Register extent status tree shrinker */
3912 ext4_es_register_shrinker(sbi
);
3914 err
= percpu_counter_init(&sbi
->s_freeclusters_counter
,
3915 ext4_count_free_clusters(sb
));
3917 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
3918 ext4_count_free_inodes(sb
));
3921 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
3922 ext4_count_dirs(sb
));
3925 err
= percpu_counter_init(&sbi
->s_dirtyclusters_counter
, 0);
3928 err
= percpu_counter_init(&sbi
->s_extent_cache_cnt
, 0);
3931 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
3935 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
3936 sbi
->s_extent_max_zeroout_kb
= 32;
3938 sb
->s_export_op
= &ext4_export_ops
;
3939 sb
->s_xattr
= ext4_xattr_handlers
;
3941 sb
->dq_op
= &ext4_quota_operations
;
3942 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
))
3943 sb
->s_qcop
= &ext4_qctl_sysfile_operations
;
3945 sb
->s_qcop
= &ext4_qctl_operations
;
3947 memcpy(sb
->s_uuid
, es
->s_uuid
, sizeof(es
->s_uuid
));
3949 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
3950 mutex_init(&sbi
->s_orphan_lock
);
3954 needs_recovery
= (es
->s_last_orphan
!= 0 ||
3955 EXT4_HAS_INCOMPAT_FEATURE(sb
,
3956 EXT4_FEATURE_INCOMPAT_RECOVER
));
3958 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_MMP
) &&
3959 !(sb
->s_flags
& MS_RDONLY
))
3960 if (ext4_multi_mount_protect(sb
, le64_to_cpu(es
->s_mmp_block
)))
3964 * The first inode we look at is the journal inode. Don't try
3965 * root first: it may be modified in the journal!
3967 if (!test_opt(sb
, NOLOAD
) &&
3968 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
3969 if (ext4_load_journal(sb
, es
, journal_devnum
))
3971 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
3972 EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3973 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
3974 "suppressed and not mounted read-only");
3975 goto failed_mount_wq
;
3977 clear_opt(sb
, DATA_FLAGS
);
3978 sbi
->s_journal
= NULL
;
3983 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
) &&
3984 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
3985 JBD2_FEATURE_INCOMPAT_64BIT
)) {
3986 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
3987 goto failed_mount_wq
;
3990 if (!set_journal_csum_feature_set(sb
)) {
3991 ext4_msg(sb
, KERN_ERR
, "Failed to set journal checksum "
3993 goto failed_mount_wq
;
3996 /* We have now updated the journal if required, so we can
3997 * validate the data journaling mode. */
3998 switch (test_opt(sb
, DATA_FLAGS
)) {
4000 /* No mode set, assume a default based on the journal
4001 * capabilities: ORDERED_DATA if the journal can
4002 * cope, else JOURNAL_DATA
4004 if (jbd2_journal_check_available_features
4005 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
4006 set_opt(sb
, ORDERED_DATA
);
4008 set_opt(sb
, JOURNAL_DATA
);
4011 case EXT4_MOUNT_ORDERED_DATA
:
4012 case EXT4_MOUNT_WRITEBACK_DATA
:
4013 if (!jbd2_journal_check_available_features
4014 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
4015 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
4016 "requested data journaling mode");
4017 goto failed_mount_wq
;
4022 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
4024 sbi
->s_journal
->j_commit_callback
= ext4_journal_commit_callback
;
4027 * The journal may have updated the bg summary counts, so we
4028 * need to update the global counters.
4030 percpu_counter_set(&sbi
->s_freeclusters_counter
,
4031 ext4_count_free_clusters(sb
));
4032 percpu_counter_set(&sbi
->s_freeinodes_counter
,
4033 ext4_count_free_inodes(sb
));
4034 percpu_counter_set(&sbi
->s_dirs_counter
,
4035 ext4_count_dirs(sb
));
4036 percpu_counter_set(&sbi
->s_dirtyclusters_counter
, 0);
4039 if (ext4_mballoc_ready
) {
4040 sbi
->s_mb_cache
= ext4_xattr_create_cache(sb
->s_id
);
4041 if (!sbi
->s_mb_cache
) {
4042 ext4_msg(sb
, KERN_ERR
, "Failed to create an mb_cache");
4043 goto failed_mount_wq
;
4048 * Get the # of file system overhead blocks from the
4049 * superblock if present.
4051 if (es
->s_overhead_clusters
)
4052 sbi
->s_overhead
= le32_to_cpu(es
->s_overhead_clusters
);
4054 err
= ext4_calculate_overhead(sb
);
4056 goto failed_mount_wq
;
4060 * The maximum number of concurrent works can be high and
4061 * concurrency isn't really necessary. Limit it to 1.
4063 EXT4_SB(sb
)->rsv_conversion_wq
=
4064 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM
| WQ_UNBOUND
, 1);
4065 if (!EXT4_SB(sb
)->rsv_conversion_wq
) {
4066 printk(KERN_ERR
"EXT4-fs: failed to create workqueue\n");
4072 * The jbd2_journal_load will have done any necessary log recovery,
4073 * so we can safely mount the rest of the filesystem now.
4076 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
4078 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
4079 ret
= PTR_ERR(root
);
4083 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
4084 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
4088 sb
->s_root
= d_make_root(root
);
4090 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
4095 if (ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
))
4096 sb
->s_flags
|= MS_RDONLY
;
4098 /* determine the minimum size of new large inodes, if present */
4099 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
4100 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
4101 EXT4_GOOD_OLD_INODE_SIZE
;
4102 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
4103 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
4104 if (sbi
->s_want_extra_isize
<
4105 le16_to_cpu(es
->s_want_extra_isize
))
4106 sbi
->s_want_extra_isize
=
4107 le16_to_cpu(es
->s_want_extra_isize
);
4108 if (sbi
->s_want_extra_isize
<
4109 le16_to_cpu(es
->s_min_extra_isize
))
4110 sbi
->s_want_extra_isize
=
4111 le16_to_cpu(es
->s_min_extra_isize
);
4114 /* Check if enough inode space is available */
4115 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
4116 sbi
->s_inode_size
) {
4117 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
4118 EXT4_GOOD_OLD_INODE_SIZE
;
4119 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
4123 err
= ext4_reserve_clusters(sbi
, ext4_calculate_resv_clusters(sb
));
4125 ext4_msg(sb
, KERN_ERR
, "failed to reserve %llu clusters for "
4126 "reserved pool", ext4_calculate_resv_clusters(sb
));
4130 err
= ext4_setup_system_zone(sb
);
4132 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
4137 err
= ext4_register_li_request(sb
, first_not_zeroed
);
4141 sbi
->s_kobj
.kset
= ext4_kset
;
4142 init_completion(&sbi
->s_kobj_unregister
);
4143 err
= kobject_init_and_add(&sbi
->s_kobj
, &ext4_ktype
, NULL
,
4149 /* Enable quota usage during mount. */
4150 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
) &&
4151 !(sb
->s_flags
& MS_RDONLY
)) {
4152 err
= ext4_enable_quotas(sb
);
4156 #endif /* CONFIG_QUOTA */
4158 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
4159 ext4_orphan_cleanup(sb
, es
);
4160 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
4161 if (needs_recovery
) {
4162 ext4_msg(sb
, KERN_INFO
, "recovery complete");
4163 ext4_mark_recovery_complete(sb
, es
);
4165 if (EXT4_SB(sb
)->s_journal
) {
4166 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
4167 descr
= " journalled data mode";
4168 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
4169 descr
= " ordered data mode";
4171 descr
= " writeback data mode";
4173 descr
= "out journal";
4175 if (test_opt(sb
, DISCARD
)) {
4176 struct request_queue
*q
= bdev_get_queue(sb
->s_bdev
);
4177 if (!blk_queue_discard(q
))
4178 ext4_msg(sb
, KERN_WARNING
,
4179 "mounting with \"discard\" option, but "
4180 "the device does not support discard");
4183 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s. "
4184 "Opts: %s%s%s", descr
, sbi
->s_es
->s_mount_opts
,
4185 *sbi
->s_es
->s_mount_opts
? "; " : "", orig_data
);
4187 if (es
->s_error_count
)
4188 mod_timer(&sbi
->s_err_report
, jiffies
+ 300*HZ
); /* 5 minutes */
4190 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4191 ratelimit_state_init(&sbi
->s_err_ratelimit_state
, 5 * HZ
, 10);
4192 ratelimit_state_init(&sbi
->s_warning_ratelimit_state
, 5 * HZ
, 10);
4193 ratelimit_state_init(&sbi
->s_msg_ratelimit_state
, 5 * HZ
, 10);
4200 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
4205 kobject_del(&sbi
->s_kobj
);
4208 ext4_unregister_li_request(sb
);
4210 ext4_release_system_zone(sb
);
4215 ext4_msg(sb
, KERN_ERR
, "mount failed");
4216 if (EXT4_SB(sb
)->rsv_conversion_wq
)
4217 destroy_workqueue(EXT4_SB(sb
)->rsv_conversion_wq
);
4219 if (sbi
->s_journal
) {
4220 jbd2_journal_destroy(sbi
->s_journal
);
4221 sbi
->s_journal
= NULL
;
4224 ext4_es_unregister_shrinker(sbi
);
4225 del_timer_sync(&sbi
->s_err_report
);
4226 if (sbi
->s_flex_groups
)
4227 ext4_kvfree(sbi
->s_flex_groups
);
4228 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
4229 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
4230 percpu_counter_destroy(&sbi
->s_dirs_counter
);
4231 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
4232 percpu_counter_destroy(&sbi
->s_extent_cache_cnt
);
4234 kthread_stop(sbi
->s_mmp_tsk
);
4236 ext4_mb_release(sb
);
4238 for (i
= 0; i
< db_count
; i
++)
4239 brelse(sbi
->s_group_desc
[i
]);
4240 ext4_kvfree(sbi
->s_group_desc
);
4242 ext4_ext_release(sb
);
4243 if (sbi
->s_chksum_driver
)
4244 crypto_free_shash(sbi
->s_chksum_driver
);
4246 remove_proc_entry("options", sbi
->s_proc
);
4247 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
4250 for (i
= 0; i
< MAXQUOTAS
; i
++)
4251 kfree(sbi
->s_qf_names
[i
]);
4253 ext4_blkdev_remove(sbi
);
4256 sb
->s_fs_info
= NULL
;
4257 kfree(sbi
->s_blockgroup_lock
);
4261 return err
? err
: ret
;
4265 * Setup any per-fs journal parameters now. We'll do this both on
4266 * initial mount, once the journal has been initialised but before we've
4267 * done any recovery; and again on any subsequent remount.
4269 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
4271 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4273 journal
->j_commit_interval
= sbi
->s_commit_interval
;
4274 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
4275 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
4277 write_lock(&journal
->j_state_lock
);
4278 if (test_opt(sb
, BARRIER
))
4279 journal
->j_flags
|= JBD2_BARRIER
;
4281 journal
->j_flags
&= ~JBD2_BARRIER
;
4282 if (test_opt(sb
, DATA_ERR_ABORT
))
4283 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
4285 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
4286 write_unlock(&journal
->j_state_lock
);
4289 static journal_t
*ext4_get_journal(struct super_block
*sb
,
4290 unsigned int journal_inum
)
4292 struct inode
*journal_inode
;
4295 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4297 /* First, test for the existence of a valid inode on disk. Bad
4298 * things happen if we iget() an unused inode, as the subsequent
4299 * iput() will try to delete it. */
4301 journal_inode
= ext4_iget(sb
, journal_inum
);
4302 if (IS_ERR(journal_inode
)) {
4303 ext4_msg(sb
, KERN_ERR
, "no journal found");
4306 if (!journal_inode
->i_nlink
) {
4307 make_bad_inode(journal_inode
);
4308 iput(journal_inode
);
4309 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
4313 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4314 journal_inode
, journal_inode
->i_size
);
4315 if (!S_ISREG(journal_inode
->i_mode
)) {
4316 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
4317 iput(journal_inode
);
4321 journal
= jbd2_journal_init_inode(journal_inode
);
4323 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
4324 iput(journal_inode
);
4327 journal
->j_private
= sb
;
4328 ext4_init_journal_params(sb
, journal
);
4332 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
4335 struct buffer_head
*bh
;
4339 int hblock
, blocksize
;
4340 ext4_fsblk_t sb_block
;
4341 unsigned long offset
;
4342 struct ext4_super_block
*es
;
4343 struct block_device
*bdev
;
4345 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4347 bdev
= ext4_blkdev_get(j_dev
, sb
);
4351 blocksize
= sb
->s_blocksize
;
4352 hblock
= bdev_logical_block_size(bdev
);
4353 if (blocksize
< hblock
) {
4354 ext4_msg(sb
, KERN_ERR
,
4355 "blocksize too small for journal device");
4359 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
4360 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
4361 set_blocksize(bdev
, blocksize
);
4362 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
4363 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
4364 "external journal");
4368 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
4369 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
4370 !(le32_to_cpu(es
->s_feature_incompat
) &
4371 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
4372 ext4_msg(sb
, KERN_ERR
, "external journal has "
4378 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
4379 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
4384 len
= ext4_blocks_count(es
);
4385 start
= sb_block
+ 1;
4386 brelse(bh
); /* we're done with the superblock */
4388 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
4389 start
, len
, blocksize
);
4391 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
4394 journal
->j_private
= sb
;
4395 ll_rw_block(READ
| REQ_META
| REQ_PRIO
, 1, &journal
->j_sb_buffer
);
4396 wait_on_buffer(journal
->j_sb_buffer
);
4397 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
4398 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
4401 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
4402 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
4403 "user (unsupported) - %d",
4404 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
4407 EXT4_SB(sb
)->journal_bdev
= bdev
;
4408 ext4_init_journal_params(sb
, journal
);
4412 jbd2_journal_destroy(journal
);
4414 ext4_blkdev_put(bdev
);
4418 static int ext4_load_journal(struct super_block
*sb
,
4419 struct ext4_super_block
*es
,
4420 unsigned long journal_devnum
)
4423 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
4426 int really_read_only
;
4428 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4430 if (journal_devnum
&&
4431 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4432 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
4433 "numbers have changed");
4434 journal_dev
= new_decode_dev(journal_devnum
);
4436 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
4438 really_read_only
= bdev_read_only(sb
->s_bdev
);
4441 * Are we loading a blank journal or performing recovery after a
4442 * crash? For recovery, we need to check in advance whether we
4443 * can get read-write access to the device.
4445 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
4446 if (sb
->s_flags
& MS_RDONLY
) {
4447 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
4448 "required on readonly filesystem");
4449 if (really_read_only
) {
4450 ext4_msg(sb
, KERN_ERR
, "write access "
4451 "unavailable, cannot proceed");
4454 ext4_msg(sb
, KERN_INFO
, "write access will "
4455 "be enabled during recovery");
4459 if (journal_inum
&& journal_dev
) {
4460 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
4461 "and inode journals!");
4466 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
4469 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
4473 if (!(journal
->j_flags
& JBD2_BARRIER
))
4474 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
4476 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
4477 err
= jbd2_journal_wipe(journal
, !really_read_only
);
4479 char *save
= kmalloc(EXT4_S_ERR_LEN
, GFP_KERNEL
);
4481 memcpy(save
, ((char *) es
) +
4482 EXT4_S_ERR_START
, EXT4_S_ERR_LEN
);
4483 err
= jbd2_journal_load(journal
);
4485 memcpy(((char *) es
) + EXT4_S_ERR_START
,
4486 save
, EXT4_S_ERR_LEN
);
4491 ext4_msg(sb
, KERN_ERR
, "error loading journal");
4492 jbd2_journal_destroy(journal
);
4496 EXT4_SB(sb
)->s_journal
= journal
;
4497 ext4_clear_journal_err(sb
, es
);
4499 if (!really_read_only
&& journal_devnum
&&
4500 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4501 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
4503 /* Make sure we flush the recovery flag to disk. */
4504 ext4_commit_super(sb
, 1);
4510 static int ext4_commit_super(struct super_block
*sb
, int sync
)
4512 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
4513 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
4516 if (!sbh
|| block_device_ejected(sb
))
4518 if (buffer_write_io_error(sbh
)) {
4520 * Oh, dear. A previous attempt to write the
4521 * superblock failed. This could happen because the
4522 * USB device was yanked out. Or it could happen to
4523 * be a transient write error and maybe the block will
4524 * be remapped. Nothing we can do but to retry the
4525 * write and hope for the best.
4527 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
4528 "superblock detected");
4529 clear_buffer_write_io_error(sbh
);
4530 set_buffer_uptodate(sbh
);
4533 * If the file system is mounted read-only, don't update the
4534 * superblock write time. This avoids updating the superblock
4535 * write time when we are mounting the root file system
4536 * read/only but we need to replay the journal; at that point,
4537 * for people who are east of GMT and who make their clock
4538 * tick in localtime for Windows bug-for-bug compatibility,
4539 * the clock is set in the future, and this will cause e2fsck
4540 * to complain and force a full file system check.
4542 if (!(sb
->s_flags
& MS_RDONLY
))
4543 es
->s_wtime
= cpu_to_le32(get_seconds());
4544 if (sb
->s_bdev
->bd_part
)
4545 es
->s_kbytes_written
=
4546 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
4547 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
4548 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
4550 es
->s_kbytes_written
=
4551 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
);
4552 ext4_free_blocks_count_set(es
,
4553 EXT4_C2B(EXT4_SB(sb
), percpu_counter_sum_positive(
4554 &EXT4_SB(sb
)->s_freeclusters_counter
)));
4555 es
->s_free_inodes_count
=
4556 cpu_to_le32(percpu_counter_sum_positive(
4557 &EXT4_SB(sb
)->s_freeinodes_counter
));
4558 BUFFER_TRACE(sbh
, "marking dirty");
4559 ext4_superblock_csum_set(sb
);
4560 mark_buffer_dirty(sbh
);
4562 error
= sync_dirty_buffer(sbh
);
4566 error
= buffer_write_io_error(sbh
);
4568 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
4570 clear_buffer_write_io_error(sbh
);
4571 set_buffer_uptodate(sbh
);
4578 * Have we just finished recovery? If so, and if we are mounting (or
4579 * remounting) the filesystem readonly, then we will end up with a
4580 * consistent fs on disk. Record that fact.
4582 static void ext4_mark_recovery_complete(struct super_block
*sb
,
4583 struct ext4_super_block
*es
)
4585 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
4587 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
4588 BUG_ON(journal
!= NULL
);
4591 jbd2_journal_lock_updates(journal
);
4592 if (jbd2_journal_flush(journal
) < 0)
4595 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
4596 sb
->s_flags
& MS_RDONLY
) {
4597 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4598 ext4_commit_super(sb
, 1);
4602 jbd2_journal_unlock_updates(journal
);
4606 * If we are mounting (or read-write remounting) a filesystem whose journal
4607 * has recorded an error from a previous lifetime, move that error to the
4608 * main filesystem now.
4610 static void ext4_clear_journal_err(struct super_block
*sb
,
4611 struct ext4_super_block
*es
)
4617 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4619 journal
= EXT4_SB(sb
)->s_journal
;
4622 * Now check for any error status which may have been recorded in the
4623 * journal by a prior ext4_error() or ext4_abort()
4626 j_errno
= jbd2_journal_errno(journal
);
4630 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
4631 ext4_warning(sb
, "Filesystem error recorded "
4632 "from previous mount: %s", errstr
);
4633 ext4_warning(sb
, "Marking fs in need of filesystem check.");
4635 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
4636 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
4637 ext4_commit_super(sb
, 1);
4639 jbd2_journal_clear_err(journal
);
4640 jbd2_journal_update_sb_errno(journal
);
4645 * Force the running and committing transactions to commit,
4646 * and wait on the commit.
4648 int ext4_force_commit(struct super_block
*sb
)
4652 if (sb
->s_flags
& MS_RDONLY
)
4655 journal
= EXT4_SB(sb
)->s_journal
;
4656 return ext4_journal_force_commit(journal
);
4659 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
4663 bool needs_barrier
= false;
4664 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4666 trace_ext4_sync_fs(sb
, wait
);
4667 flush_workqueue(sbi
->rsv_conversion_wq
);
4669 * Writeback quota in non-journalled quota case - journalled quota has
4672 dquot_writeback_dquots(sb
, -1);
4674 * Data writeback is possible w/o journal transaction, so barrier must
4675 * being sent at the end of the function. But we can skip it if
4676 * transaction_commit will do it for us.
4678 target
= jbd2_get_latest_transaction(sbi
->s_journal
);
4679 if (wait
&& sbi
->s_journal
->j_flags
& JBD2_BARRIER
&&
4680 !jbd2_trans_will_send_data_barrier(sbi
->s_journal
, target
))
4681 needs_barrier
= true;
4683 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
4685 ret
= jbd2_log_wait_commit(sbi
->s_journal
, target
);
4687 if (needs_barrier
) {
4689 err
= blkdev_issue_flush(sb
->s_bdev
, GFP_KERNEL
, NULL
);
4697 static int ext4_sync_fs_nojournal(struct super_block
*sb
, int wait
)
4701 trace_ext4_sync_fs(sb
, wait
);
4702 flush_workqueue(EXT4_SB(sb
)->rsv_conversion_wq
);
4703 dquot_writeback_dquots(sb
, -1);
4704 if (wait
&& test_opt(sb
, BARRIER
))
4705 ret
= blkdev_issue_flush(sb
->s_bdev
, GFP_KERNEL
, NULL
);
4711 * LVM calls this function before a (read-only) snapshot is created. This
4712 * gives us a chance to flush the journal completely and mark the fs clean.
4714 * Note that only this function cannot bring a filesystem to be in a clean
4715 * state independently. It relies on upper layer to stop all data & metadata
4718 static int ext4_freeze(struct super_block
*sb
)
4723 if (sb
->s_flags
& MS_RDONLY
)
4726 journal
= EXT4_SB(sb
)->s_journal
;
4728 /* Now we set up the journal barrier. */
4729 jbd2_journal_lock_updates(journal
);
4732 * Don't clear the needs_recovery flag if we failed to flush
4735 error
= jbd2_journal_flush(journal
);
4739 /* Journal blocked and flushed, clear needs_recovery flag. */
4740 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4741 error
= ext4_commit_super(sb
, 1);
4743 /* we rely on upper layer to stop further updates */
4744 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
4749 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4750 * flag here, even though the filesystem is not technically dirty yet.
4752 static int ext4_unfreeze(struct super_block
*sb
)
4754 if (sb
->s_flags
& MS_RDONLY
)
4757 /* Reset the needs_recovery flag before the fs is unlocked. */
4758 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4759 ext4_commit_super(sb
, 1);
4764 * Structure to save mount options for ext4_remount's benefit
4766 struct ext4_mount_options
{
4767 unsigned long s_mount_opt
;
4768 unsigned long s_mount_opt2
;
4771 unsigned long s_commit_interval
;
4772 u32 s_min_batch_time
, s_max_batch_time
;
4775 char *s_qf_names
[MAXQUOTAS
];
4779 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
4781 struct ext4_super_block
*es
;
4782 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4783 unsigned long old_sb_flags
;
4784 struct ext4_mount_options old_opts
;
4785 int enable_quota
= 0;
4787 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
4792 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
4794 /* Store the original options */
4795 old_sb_flags
= sb
->s_flags
;
4796 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
4797 old_opts
.s_mount_opt2
= sbi
->s_mount_opt2
;
4798 old_opts
.s_resuid
= sbi
->s_resuid
;
4799 old_opts
.s_resgid
= sbi
->s_resgid
;
4800 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
4801 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
4802 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
4804 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
4805 for (i
= 0; i
< MAXQUOTAS
; i
++)
4806 if (sbi
->s_qf_names
[i
]) {
4807 old_opts
.s_qf_names
[i
] = kstrdup(sbi
->s_qf_names
[i
],
4809 if (!old_opts
.s_qf_names
[i
]) {
4810 for (j
= 0; j
< i
; j
++)
4811 kfree(old_opts
.s_qf_names
[j
]);
4816 old_opts
.s_qf_names
[i
] = NULL
;
4818 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
4819 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
4822 * Allow the "check" option to be passed as a remount option.
4824 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
, 1)) {
4829 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
4830 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
4831 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4832 "both data=journal and delalloc");
4836 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
4837 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4838 "both data=journal and dioread_nolock");
4844 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
4845 ext4_abort(sb
, "Abort forced by user");
4847 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
4848 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
4852 if (sbi
->s_journal
) {
4853 ext4_init_journal_params(sb
, sbi
->s_journal
);
4854 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
4857 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
)) {
4858 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
4863 if (*flags
& MS_RDONLY
) {
4864 err
= sync_filesystem(sb
);
4867 err
= dquot_suspend(sb
, -1);
4872 * First of all, the unconditional stuff we have to do
4873 * to disable replay of the journal when we next remount
4875 sb
->s_flags
|= MS_RDONLY
;
4878 * OK, test if we are remounting a valid rw partition
4879 * readonly, and if so set the rdonly flag and then
4880 * mark the partition as valid again.
4882 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
4883 (sbi
->s_mount_state
& EXT4_VALID_FS
))
4884 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
4887 ext4_mark_recovery_complete(sb
, es
);
4889 /* Make sure we can mount this feature set readwrite */
4890 if (!ext4_feature_set_ok(sb
, 0)) {
4895 * Make sure the group descriptor checksums
4896 * are sane. If they aren't, refuse to remount r/w.
4898 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
4899 struct ext4_group_desc
*gdp
=
4900 ext4_get_group_desc(sb
, g
, NULL
);
4902 if (!ext4_group_desc_csum_verify(sb
, g
, gdp
)) {
4903 ext4_msg(sb
, KERN_ERR
,
4904 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4905 g
, le16_to_cpu(ext4_group_desc_csum(sbi
, g
, gdp
)),
4906 le16_to_cpu(gdp
->bg_checksum
));
4913 * If we have an unprocessed orphan list hanging
4914 * around from a previously readonly bdev mount,
4915 * require a full umount/remount for now.
4917 if (es
->s_last_orphan
) {
4918 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
4919 "remount RDWR because of unprocessed "
4920 "orphan inode list. Please "
4921 "umount/remount instead");
4927 * Mounting a RDONLY partition read-write, so reread
4928 * and store the current valid flag. (It may have
4929 * been changed by e2fsck since we originally mounted
4933 ext4_clear_journal_err(sb
, es
);
4934 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
4935 if (!ext4_setup_super(sb
, es
, 0))
4936 sb
->s_flags
&= ~MS_RDONLY
;
4937 if (EXT4_HAS_INCOMPAT_FEATURE(sb
,
4938 EXT4_FEATURE_INCOMPAT_MMP
))
4939 if (ext4_multi_mount_protect(sb
,
4940 le64_to_cpu(es
->s_mmp_block
))) {
4949 * Reinitialize lazy itable initialization thread based on
4952 if ((sb
->s_flags
& MS_RDONLY
) || !test_opt(sb
, INIT_INODE_TABLE
))
4953 ext4_unregister_li_request(sb
);
4955 ext4_group_t first_not_zeroed
;
4956 first_not_zeroed
= ext4_has_uninit_itable(sb
);
4957 ext4_register_li_request(sb
, first_not_zeroed
);
4960 ext4_setup_system_zone(sb
);
4961 if (sbi
->s_journal
== NULL
&& !(old_sb_flags
& MS_RDONLY
))
4962 ext4_commit_super(sb
, 1);
4965 /* Release old quota file names */
4966 for (i
= 0; i
< MAXQUOTAS
; i
++)
4967 kfree(old_opts
.s_qf_names
[i
]);
4969 if (sb_any_quota_suspended(sb
))
4970 dquot_resume(sb
, -1);
4971 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
4972 EXT4_FEATURE_RO_COMPAT_QUOTA
)) {
4973 err
= ext4_enable_quotas(sb
);
4980 ext4_msg(sb
, KERN_INFO
, "re-mounted. Opts: %s", orig_data
);
4985 sb
->s_flags
= old_sb_flags
;
4986 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
4987 sbi
->s_mount_opt2
= old_opts
.s_mount_opt2
;
4988 sbi
->s_resuid
= old_opts
.s_resuid
;
4989 sbi
->s_resgid
= old_opts
.s_resgid
;
4990 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
4991 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
4992 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
4994 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
4995 for (i
= 0; i
< MAXQUOTAS
; i
++) {
4996 kfree(sbi
->s_qf_names
[i
]);
4997 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
5004 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
5006 struct super_block
*sb
= dentry
->d_sb
;
5007 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
5008 struct ext4_super_block
*es
= sbi
->s_es
;
5009 ext4_fsblk_t overhead
= 0, resv_blocks
;
5012 resv_blocks
= EXT4_C2B(sbi
, atomic64_read(&sbi
->s_resv_clusters
));
5014 if (!test_opt(sb
, MINIX_DF
))
5015 overhead
= sbi
->s_overhead
;
5017 buf
->f_type
= EXT4_SUPER_MAGIC
;
5018 buf
->f_bsize
= sb
->s_blocksize
;
5019 buf
->f_blocks
= ext4_blocks_count(es
) - EXT4_C2B(sbi
, overhead
);
5020 bfree
= percpu_counter_sum_positive(&sbi
->s_freeclusters_counter
) -
5021 percpu_counter_sum_positive(&sbi
->s_dirtyclusters_counter
);
5022 /* prevent underflow in case that few free space is available */
5023 buf
->f_bfree
= EXT4_C2B(sbi
, max_t(s64
, bfree
, 0));
5024 buf
->f_bavail
= buf
->f_bfree
-
5025 (ext4_r_blocks_count(es
) + resv_blocks
);
5026 if (buf
->f_bfree
< (ext4_r_blocks_count(es
) + resv_blocks
))
5028 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
5029 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
5030 buf
->f_namelen
= EXT4_NAME_LEN
;
5031 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
5032 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
5033 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
5034 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
5039 /* Helper function for writing quotas on sync - we need to start transaction
5040 * before quota file is locked for write. Otherwise the are possible deadlocks:
5041 * Process 1 Process 2
5042 * ext4_create() quota_sync()
5043 * jbd2_journal_start() write_dquot()
5044 * dquot_initialize() down(dqio_mutex)
5045 * down(dqio_mutex) jbd2_journal_start()
5051 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
5053 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_id
.type
];
5056 static int ext4_write_dquot(struct dquot
*dquot
)
5060 struct inode
*inode
;
5062 inode
= dquot_to_inode(dquot
);
5063 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
,
5064 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
5066 return PTR_ERR(handle
);
5067 ret
= dquot_commit(dquot
);
5068 err
= ext4_journal_stop(handle
);
5074 static int ext4_acquire_dquot(struct dquot
*dquot
)
5079 handle
= ext4_journal_start(dquot_to_inode(dquot
), EXT4_HT_QUOTA
,
5080 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
5082 return PTR_ERR(handle
);
5083 ret
= dquot_acquire(dquot
);
5084 err
= ext4_journal_stop(handle
);
5090 static int ext4_release_dquot(struct dquot
*dquot
)
5095 handle
= ext4_journal_start(dquot_to_inode(dquot
), EXT4_HT_QUOTA
,
5096 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
5097 if (IS_ERR(handle
)) {
5098 /* Release dquot anyway to avoid endless cycle in dqput() */
5099 dquot_release(dquot
);
5100 return PTR_ERR(handle
);
5102 ret
= dquot_release(dquot
);
5103 err
= ext4_journal_stop(handle
);
5109 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
5111 struct super_block
*sb
= dquot
->dq_sb
;
5112 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
5114 /* Are we journaling quotas? */
5115 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
) ||
5116 sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
5117 dquot_mark_dquot_dirty(dquot
);
5118 return ext4_write_dquot(dquot
);
5120 return dquot_mark_dquot_dirty(dquot
);
5124 static int ext4_write_info(struct super_block
*sb
, int type
)
5129 /* Data block + inode block */
5130 handle
= ext4_journal_start(sb
->s_root
->d_inode
, EXT4_HT_QUOTA
, 2);
5132 return PTR_ERR(handle
);
5133 ret
= dquot_commit_info(sb
, type
);
5134 err
= ext4_journal_stop(handle
);
5141 * Turn on quotas during mount time - we need to find
5142 * the quota file and such...
5144 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
5146 return dquot_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
5147 EXT4_SB(sb
)->s_jquota_fmt
, type
);
5151 * Standard function to be called on quota_on
5153 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
5158 if (!test_opt(sb
, QUOTA
))
5161 /* Quotafile not on the same filesystem? */
5162 if (path
->dentry
->d_sb
!= sb
)
5164 /* Journaling quota? */
5165 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
5166 /* Quotafile not in fs root? */
5167 if (path
->dentry
->d_parent
!= sb
->s_root
)
5168 ext4_msg(sb
, KERN_WARNING
,
5169 "Quota file not on filesystem root. "
5170 "Journaled quota will not work");
5174 * When we journal data on quota file, we have to flush journal to see
5175 * all updates to the file when we bypass pagecache...
5177 if (EXT4_SB(sb
)->s_journal
&&
5178 ext4_should_journal_data(path
->dentry
->d_inode
)) {
5180 * We don't need to lock updates but journal_flush() could
5181 * otherwise be livelocked...
5183 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
5184 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
5185 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
5190 return dquot_quota_on(sb
, type
, format_id
, path
);
5193 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
5197 struct inode
*qf_inode
;
5198 unsigned long qf_inums
[MAXQUOTAS
] = {
5199 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
5200 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
)
5203 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
));
5205 if (!qf_inums
[type
])
5208 qf_inode
= ext4_iget(sb
, qf_inums
[type
]);
5209 if (IS_ERR(qf_inode
)) {
5210 ext4_error(sb
, "Bad quota inode # %lu", qf_inums
[type
]);
5211 return PTR_ERR(qf_inode
);
5214 /* Don't account quota for quota files to avoid recursion */
5215 qf_inode
->i_flags
|= S_NOQUOTA
;
5216 err
= dquot_enable(qf_inode
, type
, format_id
, flags
);
5222 /* Enable usage tracking for all quota types. */
5223 static int ext4_enable_quotas(struct super_block
*sb
)
5226 unsigned long qf_inums
[MAXQUOTAS
] = {
5227 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
5228 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
)
5231 sb_dqopt(sb
)->flags
|= DQUOT_QUOTA_SYS_FILE
;
5232 for (type
= 0; type
< MAXQUOTAS
; type
++) {
5233 if (qf_inums
[type
]) {
5234 err
= ext4_quota_enable(sb
, type
, QFMT_VFS_V1
,
5235 DQUOT_USAGE_ENABLED
);
5238 "Failed to enable quota tracking "
5239 "(type=%d, err=%d). Please run "
5240 "e2fsck to fix.", type
, err
);
5249 * quota_on function that is used when QUOTA feature is set.
5251 static int ext4_quota_on_sysfile(struct super_block
*sb
, int type
,
5254 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
))
5258 * USAGE was enabled at mount time. Only need to enable LIMITS now.
5260 return ext4_quota_enable(sb
, type
, format_id
, DQUOT_LIMITS_ENABLED
);
5263 static int ext4_quota_off(struct super_block
*sb
, int type
)
5265 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5268 /* Force all delayed allocation blocks to be allocated.
5269 * Caller already holds s_umount sem */
5270 if (test_opt(sb
, DELALLOC
))
5271 sync_filesystem(sb
);
5276 /* Update modification times of quota files when userspace can
5277 * start looking at them */
5278 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
, 1);
5281 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
5282 ext4_mark_inode_dirty(handle
, inode
);
5283 ext4_journal_stop(handle
);
5286 return dquot_quota_off(sb
, type
);
5290 * quota_off function that is used when QUOTA feature is set.
5292 static int ext4_quota_off_sysfile(struct super_block
*sb
, int type
)
5294 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
))
5297 /* Disable only the limits. */
5298 return dquot_disable(sb
, type
, DQUOT_LIMITS_ENABLED
);
5301 /* Read data from quotafile - avoid pagecache and such because we cannot afford
5302 * acquiring the locks... As quota files are never truncated and quota code
5303 * itself serializes the operations (and no one else should touch the files)
5304 * we don't have to be afraid of races */
5305 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
5306 size_t len
, loff_t off
)
5308 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5309 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5311 int offset
= off
& (sb
->s_blocksize
- 1);
5314 struct buffer_head
*bh
;
5315 loff_t i_size
= i_size_read(inode
);
5319 if (off
+len
> i_size
)
5322 while (toread
> 0) {
5323 tocopy
= sb
->s_blocksize
- offset
< toread
?
5324 sb
->s_blocksize
- offset
: toread
;
5325 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
5328 if (!bh
) /* A hole? */
5329 memset(data
, 0, tocopy
);
5331 memcpy(data
, bh
->b_data
+offset
, tocopy
);
5341 /* Write to quotafile (we know the transaction is already started and has
5342 * enough credits) */
5343 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
5344 const char *data
, size_t len
, loff_t off
)
5346 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5347 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5349 int offset
= off
& (sb
->s_blocksize
- 1);
5350 struct buffer_head
*bh
;
5351 handle_t
*handle
= journal_current_handle();
5353 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
5354 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5355 " cancelled because transaction is not started",
5356 (unsigned long long)off
, (unsigned long long)len
);
5360 * Since we account only one data block in transaction credits,
5361 * then it is impossible to cross a block boundary.
5363 if (sb
->s_blocksize
- offset
< len
) {
5364 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5365 " cancelled because not block aligned",
5366 (unsigned long long)off
, (unsigned long long)len
);
5370 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
5373 err
= ext4_journal_get_write_access(handle
, bh
);
5379 memcpy(bh
->b_data
+offset
, data
, len
);
5380 flush_dcache_page(bh
->b_page
);
5382 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
5387 if (inode
->i_size
< off
+ len
) {
5388 i_size_write(inode
, off
+ len
);
5389 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
5390 ext4_mark_inode_dirty(handle
, inode
);
5397 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
5398 const char *dev_name
, void *data
)
5400 return mount_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
);
5403 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5404 static inline void register_as_ext2(void)
5406 int err
= register_filesystem(&ext2_fs_type
);
5409 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
5412 static inline void unregister_as_ext2(void)
5414 unregister_filesystem(&ext2_fs_type
);
5417 static inline int ext2_feature_set_ok(struct super_block
*sb
)
5419 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT2_FEATURE_INCOMPAT_SUPP
))
5421 if (sb
->s_flags
& MS_RDONLY
)
5423 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT2_FEATURE_RO_COMPAT_SUPP
))
5428 static inline void register_as_ext2(void) { }
5429 static inline void unregister_as_ext2(void) { }
5430 static inline int ext2_feature_set_ok(struct super_block
*sb
) { return 0; }
5433 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5434 static inline void register_as_ext3(void)
5436 int err
= register_filesystem(&ext3_fs_type
);
5439 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
5442 static inline void unregister_as_ext3(void)
5444 unregister_filesystem(&ext3_fs_type
);
5447 static inline int ext3_feature_set_ok(struct super_block
*sb
)
5449 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT3_FEATURE_INCOMPAT_SUPP
))
5451 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
5453 if (sb
->s_flags
& MS_RDONLY
)
5455 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT3_FEATURE_RO_COMPAT_SUPP
))
5460 static inline void register_as_ext3(void) { }
5461 static inline void unregister_as_ext3(void) { }
5462 static inline int ext3_feature_set_ok(struct super_block
*sb
) { return 0; }
5465 static struct file_system_type ext4_fs_type
= {
5466 .owner
= THIS_MODULE
,
5468 .mount
= ext4_mount
,
5469 .kill_sb
= kill_block_super
,
5470 .fs_flags
= FS_REQUIRES_DEV
,
5472 MODULE_ALIAS_FS("ext4");
5474 static int __init
ext4_init_feat_adverts(void)
5476 struct ext4_features
*ef
;
5479 ef
= kzalloc(sizeof(struct ext4_features
), GFP_KERNEL
);
5483 ef
->f_kobj
.kset
= ext4_kset
;
5484 init_completion(&ef
->f_kobj_unregister
);
5485 ret
= kobject_init_and_add(&ef
->f_kobj
, &ext4_feat_ktype
, NULL
,
5498 static void ext4_exit_feat_adverts(void)
5500 kobject_put(&ext4_feat
->f_kobj
);
5501 wait_for_completion(&ext4_feat
->f_kobj_unregister
);
5505 /* Shared across all ext4 file systems */
5506 wait_queue_head_t ext4__ioend_wq
[EXT4_WQ_HASH_SZ
];
5507 struct mutex ext4__aio_mutex
[EXT4_WQ_HASH_SZ
];
5509 static int __init
ext4_init_fs(void)
5513 ext4_li_info
= NULL
;
5514 mutex_init(&ext4_li_mtx
);
5516 /* Build-time check for flags consistency */
5517 ext4_check_flag_values();
5519 for (i
= 0; i
< EXT4_WQ_HASH_SZ
; i
++) {
5520 mutex_init(&ext4__aio_mutex
[i
]);
5521 init_waitqueue_head(&ext4__ioend_wq
[i
]);
5524 err
= ext4_init_es();
5528 err
= ext4_init_pageio();
5532 err
= ext4_init_system_zone();
5535 ext4_kset
= kset_create_and_add("ext4", NULL
, fs_kobj
);
5540 ext4_proc_root
= proc_mkdir("fs/ext4", NULL
);
5542 err
= ext4_init_feat_adverts();
5546 err
= ext4_init_mballoc();
5550 ext4_mballoc_ready
= 1;
5551 err
= init_inodecache();
5556 err
= register_filesystem(&ext4_fs_type
);
5562 unregister_as_ext2();
5563 unregister_as_ext3();
5564 destroy_inodecache();
5566 ext4_mballoc_ready
= 0;
5567 ext4_exit_mballoc();
5569 ext4_exit_feat_adverts();
5572 remove_proc_entry("fs/ext4", NULL
);
5573 kset_unregister(ext4_kset
);
5575 ext4_exit_system_zone();
5584 static void __exit
ext4_exit_fs(void)
5586 ext4_destroy_lazyinit_thread();
5587 unregister_as_ext2();
5588 unregister_as_ext3();
5589 unregister_filesystem(&ext4_fs_type
);
5590 destroy_inodecache();
5591 ext4_exit_mballoc();
5592 ext4_exit_feat_adverts();
5593 remove_proc_entry("fs/ext4", NULL
);
5594 kset_unregister(ext4_kset
);
5595 ext4_exit_system_zone();
5600 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5601 MODULE_DESCRIPTION("Fourth Extended Filesystem");
5602 MODULE_LICENSE("GPL");
5603 module_init(ext4_init_fs
)
5604 module_exit(ext4_exit_fs
)