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"
49 #include "ext4_jbd2.h"
54 #define CREATE_TRACE_POINTS
55 #include <trace/events/ext4.h>
57 static struct proc_dir_entry
*ext4_proc_root
;
58 static struct kset
*ext4_kset
;
59 static struct ext4_lazy_init
*ext4_li_info
;
60 static struct mutex ext4_li_mtx
;
61 static struct ext4_features
*ext4_feat
;
63 static int ext4_load_journal(struct super_block
*, struct ext4_super_block
*,
64 unsigned long journal_devnum
);
65 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
);
66 static int ext4_commit_super(struct super_block
*sb
, int sync
);
67 static void ext4_mark_recovery_complete(struct super_block
*sb
,
68 struct ext4_super_block
*es
);
69 static void ext4_clear_journal_err(struct super_block
*sb
,
70 struct ext4_super_block
*es
);
71 static int ext4_sync_fs(struct super_block
*sb
, int wait
);
72 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
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 void ext4_write_super(struct super_block
*sb
);
78 static int ext4_freeze(struct super_block
*sb
);
79 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
80 const char *dev_name
, void *data
);
81 static inline int ext2_feature_set_ok(struct super_block
*sb
);
82 static inline int ext3_feature_set_ok(struct super_block
*sb
);
83 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
);
84 static void ext4_destroy_lazyinit_thread(void);
85 static void ext4_unregister_li_request(struct super_block
*sb
);
86 static void ext4_clear_request_list(void);
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 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
98 #define IS_EXT2_SB(sb) (0)
102 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
103 static struct file_system_type ext3_fs_type
= {
104 .owner
= THIS_MODULE
,
107 .kill_sb
= kill_block_super
,
108 .fs_flags
= FS_REQUIRES_DEV
,
110 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
112 #define IS_EXT3_SB(sb) (0)
115 void *ext4_kvmalloc(size_t size
, gfp_t flags
)
119 ret
= kmalloc(size
, flags
);
121 ret
= __vmalloc(size
, flags
, PAGE_KERNEL
);
125 void *ext4_kvzalloc(size_t size
, gfp_t flags
)
129 ret
= kzalloc(size
, flags
);
131 ret
= __vmalloc(size
, flags
| __GFP_ZERO
, PAGE_KERNEL
);
135 void ext4_kvfree(void *ptr
)
137 if (is_vmalloc_addr(ptr
))
144 ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
145 struct ext4_group_desc
*bg
)
147 return le32_to_cpu(bg
->bg_block_bitmap_lo
) |
148 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
149 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
152 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
153 struct ext4_group_desc
*bg
)
155 return le32_to_cpu(bg
->bg_inode_bitmap_lo
) |
156 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
157 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
160 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
161 struct ext4_group_desc
*bg
)
163 return le32_to_cpu(bg
->bg_inode_table_lo
) |
164 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
165 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
168 __u32
ext4_free_group_clusters(struct super_block
*sb
,
169 struct ext4_group_desc
*bg
)
171 return le16_to_cpu(bg
->bg_free_blocks_count_lo
) |
172 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
173 (__u32
)le16_to_cpu(bg
->bg_free_blocks_count_hi
) << 16 : 0);
176 __u32
ext4_free_inodes_count(struct super_block
*sb
,
177 struct ext4_group_desc
*bg
)
179 return le16_to_cpu(bg
->bg_free_inodes_count_lo
) |
180 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
181 (__u32
)le16_to_cpu(bg
->bg_free_inodes_count_hi
) << 16 : 0);
184 __u32
ext4_used_dirs_count(struct super_block
*sb
,
185 struct ext4_group_desc
*bg
)
187 return le16_to_cpu(bg
->bg_used_dirs_count_lo
) |
188 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
189 (__u32
)le16_to_cpu(bg
->bg_used_dirs_count_hi
) << 16 : 0);
192 __u32
ext4_itable_unused_count(struct super_block
*sb
,
193 struct ext4_group_desc
*bg
)
195 return le16_to_cpu(bg
->bg_itable_unused_lo
) |
196 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
197 (__u32
)le16_to_cpu(bg
->bg_itable_unused_hi
) << 16 : 0);
200 void ext4_block_bitmap_set(struct super_block
*sb
,
201 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
203 bg
->bg_block_bitmap_lo
= cpu_to_le32((u32
)blk
);
204 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
205 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
208 void ext4_inode_bitmap_set(struct super_block
*sb
,
209 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
211 bg
->bg_inode_bitmap_lo
= cpu_to_le32((u32
)blk
);
212 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
213 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
216 void ext4_inode_table_set(struct super_block
*sb
,
217 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
219 bg
->bg_inode_table_lo
= cpu_to_le32((u32
)blk
);
220 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
221 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
224 void ext4_free_group_clusters_set(struct super_block
*sb
,
225 struct ext4_group_desc
*bg
, __u32 count
)
227 bg
->bg_free_blocks_count_lo
= cpu_to_le16((__u16
)count
);
228 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
229 bg
->bg_free_blocks_count_hi
= cpu_to_le16(count
>> 16);
232 void ext4_free_inodes_set(struct super_block
*sb
,
233 struct ext4_group_desc
*bg
, __u32 count
)
235 bg
->bg_free_inodes_count_lo
= cpu_to_le16((__u16
)count
);
236 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
237 bg
->bg_free_inodes_count_hi
= cpu_to_le16(count
>> 16);
240 void ext4_used_dirs_set(struct super_block
*sb
,
241 struct ext4_group_desc
*bg
, __u32 count
)
243 bg
->bg_used_dirs_count_lo
= cpu_to_le16((__u16
)count
);
244 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
245 bg
->bg_used_dirs_count_hi
= cpu_to_le16(count
>> 16);
248 void ext4_itable_unused_set(struct super_block
*sb
,
249 struct ext4_group_desc
*bg
, __u32 count
)
251 bg
->bg_itable_unused_lo
= cpu_to_le16((__u16
)count
);
252 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
253 bg
->bg_itable_unused_hi
= cpu_to_le16(count
>> 16);
257 /* Just increment the non-pointer handle value */
258 static handle_t
*ext4_get_nojournal(void)
260 handle_t
*handle
= current
->journal_info
;
261 unsigned long ref_cnt
= (unsigned long)handle
;
263 BUG_ON(ref_cnt
>= EXT4_NOJOURNAL_MAX_REF_COUNT
);
266 handle
= (handle_t
*)ref_cnt
;
268 current
->journal_info
= handle
;
273 /* Decrement the non-pointer handle value */
274 static void ext4_put_nojournal(handle_t
*handle
)
276 unsigned long ref_cnt
= (unsigned long)handle
;
278 BUG_ON(ref_cnt
== 0);
281 handle
= (handle_t
*)ref_cnt
;
283 current
->journal_info
= handle
;
287 * Wrappers for jbd2_journal_start/end.
289 * The only special thing we need to do here is to make sure that all
290 * journal_end calls result in the superblock being marked dirty, so
291 * that sync() will call the filesystem's write_super callback if
294 * To avoid j_barrier hold in userspace when a user calls freeze(),
295 * ext4 prevents a new handle from being started by s_frozen, which
296 * is in an upper layer.
298 handle_t
*ext4_journal_start_sb(struct super_block
*sb
, int nblocks
)
303 trace_ext4_journal_start(sb
, nblocks
, _RET_IP_
);
304 if (sb
->s_flags
& MS_RDONLY
)
305 return ERR_PTR(-EROFS
);
307 journal
= EXT4_SB(sb
)->s_journal
;
308 handle
= ext4_journal_current_handle();
311 * If a handle has been started, it should be allowed to
312 * finish, otherwise deadlock could happen between freeze
313 * and others(e.g. truncate) due to the restart of the
314 * journal handle if the filesystem is forzen and active
315 * handles are not stopped.
318 vfs_check_frozen(sb
, SB_FREEZE_TRANS
);
321 return ext4_get_nojournal();
323 * Special case here: if the journal has aborted behind our
324 * backs (eg. EIO in the commit thread), then we still need to
325 * take the FS itself readonly cleanly.
327 if (is_journal_aborted(journal
)) {
328 ext4_abort(sb
, "Detected aborted journal");
329 return ERR_PTR(-EROFS
);
331 return jbd2_journal_start(journal
, nblocks
);
335 * The only special thing we need to do here is to make sure that all
336 * jbd2_journal_stop calls result in the superblock being marked dirty, so
337 * that sync() will call the filesystem's write_super callback if
340 int __ext4_journal_stop(const char *where
, unsigned int line
, handle_t
*handle
)
342 struct super_block
*sb
;
346 if (!ext4_handle_valid(handle
)) {
347 ext4_put_nojournal(handle
);
350 sb
= handle
->h_transaction
->t_journal
->j_private
;
352 rc
= jbd2_journal_stop(handle
);
357 __ext4_std_error(sb
, where
, line
, err
);
361 void ext4_journal_abort_handle(const char *caller
, unsigned int line
,
362 const char *err_fn
, struct buffer_head
*bh
,
363 handle_t
*handle
, int err
)
366 const char *errstr
= ext4_decode_error(NULL
, err
, nbuf
);
368 BUG_ON(!ext4_handle_valid(handle
));
371 BUFFER_TRACE(bh
, "abort");
376 if (is_handle_aborted(handle
))
379 printk(KERN_ERR
"EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
380 caller
, line
, errstr
, err_fn
);
382 jbd2_journal_abort_handle(handle
);
385 static void __save_error_info(struct super_block
*sb
, const char *func
,
388 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
390 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
391 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
392 es
->s_last_error_time
= cpu_to_le32(get_seconds());
393 strncpy(es
->s_last_error_func
, func
, sizeof(es
->s_last_error_func
));
394 es
->s_last_error_line
= cpu_to_le32(line
);
395 if (!es
->s_first_error_time
) {
396 es
->s_first_error_time
= es
->s_last_error_time
;
397 strncpy(es
->s_first_error_func
, func
,
398 sizeof(es
->s_first_error_func
));
399 es
->s_first_error_line
= cpu_to_le32(line
);
400 es
->s_first_error_ino
= es
->s_last_error_ino
;
401 es
->s_first_error_block
= es
->s_last_error_block
;
404 * Start the daily error reporting function if it hasn't been
407 if (!es
->s_error_count
)
408 mod_timer(&EXT4_SB(sb
)->s_err_report
, jiffies
+ 24*60*60*HZ
);
409 es
->s_error_count
= cpu_to_le32(le32_to_cpu(es
->s_error_count
) + 1);
412 static void save_error_info(struct super_block
*sb
, const char *func
,
415 __save_error_info(sb
, func
, line
);
416 ext4_commit_super(sb
, 1);
420 * The del_gendisk() function uninitializes the disk-specific data
421 * structures, including the bdi structure, without telling anyone
422 * else. Once this happens, any attempt to call mark_buffer_dirty()
423 * (for example, by ext4_commit_super), will cause a kernel OOPS.
424 * This is a kludge to prevent these oops until we can put in a proper
425 * hook in del_gendisk() to inform the VFS and file system layers.
427 static int block_device_ejected(struct super_block
*sb
)
429 struct inode
*bd_inode
= sb
->s_bdev
->bd_inode
;
430 struct backing_dev_info
*bdi
= bd_inode
->i_mapping
->backing_dev_info
;
432 return bdi
->dev
== NULL
;
435 static void ext4_journal_commit_callback(journal_t
*journal
, transaction_t
*txn
)
437 struct super_block
*sb
= journal
->j_private
;
438 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
439 int error
= is_journal_aborted(journal
);
440 struct ext4_journal_cb_entry
*jce
, *tmp
;
442 spin_lock(&sbi
->s_md_lock
);
443 list_for_each_entry_safe(jce
, tmp
, &txn
->t_private_list
, jce_list
) {
444 list_del_init(&jce
->jce_list
);
445 spin_unlock(&sbi
->s_md_lock
);
446 jce
->jce_func(sb
, jce
, error
);
447 spin_lock(&sbi
->s_md_lock
);
449 spin_unlock(&sbi
->s_md_lock
);
452 /* Deal with the reporting of failure conditions on a filesystem such as
453 * inconsistencies detected or read IO failures.
455 * On ext2, we can store the error state of the filesystem in the
456 * superblock. That is not possible on ext4, because we may have other
457 * write ordering constraints on the superblock which prevent us from
458 * writing it out straight away; and given that the journal is about to
459 * be aborted, we can't rely on the current, or future, transactions to
460 * write out the superblock safely.
462 * We'll just use the jbd2_journal_abort() error code to record an error in
463 * the journal instead. On recovery, the journal will complain about
464 * that error until we've noted it down and cleared it.
467 static void ext4_handle_error(struct super_block
*sb
)
469 if (sb
->s_flags
& MS_RDONLY
)
472 if (!test_opt(sb
, ERRORS_CONT
)) {
473 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
475 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
477 jbd2_journal_abort(journal
, -EIO
);
479 if (test_opt(sb
, ERRORS_RO
)) {
480 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
481 sb
->s_flags
|= MS_RDONLY
;
483 if (test_opt(sb
, ERRORS_PANIC
))
484 panic("EXT4-fs (device %s): panic forced after error\n",
488 void __ext4_error(struct super_block
*sb
, const char *function
,
489 unsigned int line
, const char *fmt
, ...)
491 struct va_format vaf
;
497 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
498 sb
->s_id
, function
, line
, current
->comm
, &vaf
);
501 ext4_handle_error(sb
);
504 void ext4_error_inode(struct inode
*inode
, const char *function
,
505 unsigned int line
, ext4_fsblk_t block
,
506 const char *fmt
, ...)
509 struct va_format vaf
;
510 struct ext4_super_block
*es
= EXT4_SB(inode
->i_sb
)->s_es
;
512 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
513 es
->s_last_error_block
= cpu_to_le64(block
);
514 save_error_info(inode
->i_sb
, function
, line
);
519 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
520 "inode #%lu: block %llu: comm %s: %pV\n",
521 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
522 block
, current
->comm
, &vaf
);
524 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
525 "inode #%lu: comm %s: %pV\n",
526 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
527 current
->comm
, &vaf
);
530 ext4_handle_error(inode
->i_sb
);
533 void ext4_error_file(struct file
*file
, const char *function
,
534 unsigned int line
, ext4_fsblk_t block
,
535 const char *fmt
, ...)
538 struct va_format vaf
;
539 struct ext4_super_block
*es
;
540 struct inode
*inode
= file
->f_dentry
->d_inode
;
541 char pathname
[80], *path
;
543 es
= EXT4_SB(inode
->i_sb
)->s_es
;
544 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
545 save_error_info(inode
->i_sb
, function
, line
);
546 path
= d_path(&(file
->f_path
), pathname
, sizeof(pathname
));
554 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
555 "block %llu: comm %s: path %s: %pV\n",
556 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
557 block
, current
->comm
, path
, &vaf
);
560 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
561 "comm %s: path %s: %pV\n",
562 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
563 current
->comm
, path
, &vaf
);
566 ext4_handle_error(inode
->i_sb
);
569 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
576 errstr
= "IO failure";
579 errstr
= "Out of memory";
582 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
583 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
584 errstr
= "Journal has aborted";
586 errstr
= "Readonly filesystem";
589 /* If the caller passed in an extra buffer for unknown
590 * errors, textualise them now. Else we just return
593 /* Check for truncated error codes... */
594 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
603 /* __ext4_std_error decodes expected errors from journaling functions
604 * automatically and invokes the appropriate error response. */
606 void __ext4_std_error(struct super_block
*sb
, const char *function
,
607 unsigned int line
, int errno
)
612 /* Special case: if the error is EROFS, and we're not already
613 * inside a transaction, then there's really no point in logging
615 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
616 (sb
->s_flags
& MS_RDONLY
))
619 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
620 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s:%d: %s\n",
621 sb
->s_id
, function
, line
, errstr
);
622 save_error_info(sb
, function
, line
);
624 ext4_handle_error(sb
);
628 * ext4_abort is a much stronger failure handler than ext4_error. The
629 * abort function may be used to deal with unrecoverable failures such
630 * as journal IO errors or ENOMEM at a critical moment in log management.
632 * We unconditionally force the filesystem into an ABORT|READONLY state,
633 * unless the error response on the fs has been set to panic in which
634 * case we take the easy way out and panic immediately.
637 void __ext4_abort(struct super_block
*sb
, const char *function
,
638 unsigned int line
, const char *fmt
, ...)
642 save_error_info(sb
, function
, line
);
644 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: ", sb
->s_id
,
650 if ((sb
->s_flags
& MS_RDONLY
) == 0) {
651 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
652 sb
->s_flags
|= MS_RDONLY
;
653 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
654 if (EXT4_SB(sb
)->s_journal
)
655 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
656 save_error_info(sb
, function
, line
);
658 if (test_opt(sb
, ERRORS_PANIC
))
659 panic("EXT4-fs panic from previous error\n");
662 void ext4_msg(struct super_block
*sb
, const char *prefix
, const char *fmt
, ...)
664 struct va_format vaf
;
670 printk("%sEXT4-fs (%s): %pV\n", prefix
, sb
->s_id
, &vaf
);
674 void __ext4_warning(struct super_block
*sb
, const char *function
,
675 unsigned int line
, const char *fmt
, ...)
677 struct va_format vaf
;
683 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: %pV\n",
684 sb
->s_id
, function
, line
, &vaf
);
688 void __ext4_grp_locked_error(const char *function
, unsigned int line
,
689 struct super_block
*sb
, ext4_group_t grp
,
690 unsigned long ino
, ext4_fsblk_t block
,
691 const char *fmt
, ...)
695 struct va_format vaf
;
697 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
699 es
->s_last_error_ino
= cpu_to_le32(ino
);
700 es
->s_last_error_block
= cpu_to_le64(block
);
701 __save_error_info(sb
, function
, line
);
707 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: group %u, ",
708 sb
->s_id
, function
, line
, grp
);
710 printk(KERN_CONT
"inode %lu: ", ino
);
712 printk(KERN_CONT
"block %llu:", (unsigned long long) block
);
713 printk(KERN_CONT
"%pV\n", &vaf
);
716 if (test_opt(sb
, ERRORS_CONT
)) {
717 ext4_commit_super(sb
, 0);
721 ext4_unlock_group(sb
, grp
);
722 ext4_handle_error(sb
);
724 * We only get here in the ERRORS_RO case; relocking the group
725 * may be dangerous, but nothing bad will happen since the
726 * filesystem will have already been marked read/only and the
727 * journal has been aborted. We return 1 as a hint to callers
728 * who might what to use the return value from
729 * ext4_grp_locked_error() to distinguish between the
730 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
731 * aggressively from the ext4 function in question, with a
732 * more appropriate error code.
734 ext4_lock_group(sb
, grp
);
738 void ext4_update_dynamic_rev(struct super_block
*sb
)
740 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
742 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
746 "updating to rev %d because of new feature flag, "
747 "running e2fsck is recommended",
750 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
751 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
752 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
753 /* leave es->s_feature_*compat flags alone */
754 /* es->s_uuid will be set by e2fsck if empty */
757 * The rest of the superblock fields should be zero, and if not it
758 * means they are likely already in use, so leave them alone. We
759 * can leave it up to e2fsck to clean up any inconsistencies there.
764 * Open the external journal device
766 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
768 struct block_device
*bdev
;
769 char b
[BDEVNAME_SIZE
];
771 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
, sb
);
777 ext4_msg(sb
, KERN_ERR
, "failed to open journal device %s: %ld",
778 __bdevname(dev
, b
), PTR_ERR(bdev
));
783 * Release the journal device
785 static int ext4_blkdev_put(struct block_device
*bdev
)
787 return blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
790 static int ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
792 struct block_device
*bdev
;
795 bdev
= sbi
->journal_bdev
;
797 ret
= ext4_blkdev_put(bdev
);
798 sbi
->journal_bdev
= NULL
;
803 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
805 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
808 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
812 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
813 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
815 printk(KERN_ERR
"sb_info orphan list:\n");
816 list_for_each(l
, &sbi
->s_orphan
) {
817 struct inode
*inode
= orphan_list_entry(l
);
819 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
820 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
821 inode
->i_mode
, inode
->i_nlink
,
826 static void ext4_put_super(struct super_block
*sb
)
828 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
829 struct ext4_super_block
*es
= sbi
->s_es
;
832 ext4_unregister_li_request(sb
);
833 dquot_disable(sb
, -1, DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
835 flush_workqueue(sbi
->dio_unwritten_wq
);
836 destroy_workqueue(sbi
->dio_unwritten_wq
);
839 if (sbi
->s_journal
) {
840 err
= jbd2_journal_destroy(sbi
->s_journal
);
841 sbi
->s_journal
= NULL
;
843 ext4_abort(sb
, "Couldn't clean up the journal");
846 del_timer(&sbi
->s_err_report
);
847 ext4_release_system_zone(sb
);
849 ext4_ext_release(sb
);
850 ext4_xattr_put_super(sb
);
852 if (!(sb
->s_flags
& MS_RDONLY
)) {
853 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
854 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
856 if (sb
->s_dirt
|| !(sb
->s_flags
& MS_RDONLY
))
857 ext4_commit_super(sb
, 1);
860 remove_proc_entry("options", sbi
->s_proc
);
861 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
863 kobject_del(&sbi
->s_kobj
);
865 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
866 brelse(sbi
->s_group_desc
[i
]);
867 ext4_kvfree(sbi
->s_group_desc
);
868 ext4_kvfree(sbi
->s_flex_groups
);
869 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
870 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
871 percpu_counter_destroy(&sbi
->s_dirs_counter
);
872 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
875 for (i
= 0; i
< MAXQUOTAS
; i
++)
876 kfree(sbi
->s_qf_names
[i
]);
879 /* Debugging code just in case the in-memory inode orphan list
880 * isn't empty. The on-disk one can be non-empty if we've
881 * detected an error and taken the fs readonly, but the
882 * in-memory list had better be clean by this point. */
883 if (!list_empty(&sbi
->s_orphan
))
884 dump_orphan_list(sb
, sbi
);
885 J_ASSERT(list_empty(&sbi
->s_orphan
));
887 invalidate_bdev(sb
->s_bdev
);
888 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
890 * Invalidate the journal device's buffers. We don't want them
891 * floating about in memory - the physical journal device may
892 * hotswapped, and it breaks the `ro-after' testing code.
894 sync_blockdev(sbi
->journal_bdev
);
895 invalidate_bdev(sbi
->journal_bdev
);
896 ext4_blkdev_remove(sbi
);
899 kthread_stop(sbi
->s_mmp_tsk
);
900 sb
->s_fs_info
= NULL
;
902 * Now that we are completely done shutting down the
903 * superblock, we need to actually destroy the kobject.
906 kobject_put(&sbi
->s_kobj
);
907 wait_for_completion(&sbi
->s_kobj_unregister
);
908 kfree(sbi
->s_blockgroup_lock
);
912 static struct kmem_cache
*ext4_inode_cachep
;
915 * Called inside transaction, so use GFP_NOFS
917 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
919 struct ext4_inode_info
*ei
;
921 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
925 ei
->vfs_inode
.i_version
= 1;
926 ei
->vfs_inode
.i_data
.writeback_index
= 0;
927 memset(&ei
->i_cached_extent
, 0, sizeof(struct ext4_ext_cache
));
928 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
929 spin_lock_init(&ei
->i_prealloc_lock
);
930 ei
->i_reserved_data_blocks
= 0;
931 ei
->i_reserved_meta_blocks
= 0;
932 ei
->i_allocated_meta_blocks
= 0;
933 ei
->i_da_metadata_calc_len
= 0;
934 spin_lock_init(&(ei
->i_block_reservation_lock
));
936 ei
->i_reserved_quota
= 0;
939 INIT_LIST_HEAD(&ei
->i_completed_io_list
);
940 spin_lock_init(&ei
->i_completed_io_lock
);
941 ei
->cur_aio_dio
= NULL
;
943 ei
->i_datasync_tid
= 0;
944 atomic_set(&ei
->i_ioend_count
, 0);
945 atomic_set(&ei
->i_aiodio_unwritten
, 0);
947 return &ei
->vfs_inode
;
950 static int ext4_drop_inode(struct inode
*inode
)
952 int drop
= generic_drop_inode(inode
);
954 trace_ext4_drop_inode(inode
, drop
);
958 static void ext4_i_callback(struct rcu_head
*head
)
960 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
961 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
964 static void ext4_destroy_inode(struct inode
*inode
)
966 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
967 ext4_msg(inode
->i_sb
, KERN_ERR
,
968 "Inode %lu (%p): orphan list check failed!",
969 inode
->i_ino
, EXT4_I(inode
));
970 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
971 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
975 call_rcu(&inode
->i_rcu
, ext4_i_callback
);
978 static void init_once(void *foo
)
980 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
982 INIT_LIST_HEAD(&ei
->i_orphan
);
983 #ifdef CONFIG_EXT4_FS_XATTR
984 init_rwsem(&ei
->xattr_sem
);
986 init_rwsem(&ei
->i_data_sem
);
987 inode_init_once(&ei
->vfs_inode
);
990 static int init_inodecache(void)
992 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
993 sizeof(struct ext4_inode_info
),
994 0, (SLAB_RECLAIM_ACCOUNT
|
997 if (ext4_inode_cachep
== NULL
)
1002 static void destroy_inodecache(void)
1004 kmem_cache_destroy(ext4_inode_cachep
);
1007 void ext4_clear_inode(struct inode
*inode
)
1009 invalidate_inode_buffers(inode
);
1012 ext4_discard_preallocations(inode
);
1013 if (EXT4_I(inode
)->jinode
) {
1014 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode
),
1015 EXT4_I(inode
)->jinode
);
1016 jbd2_free_inode(EXT4_I(inode
)->jinode
);
1017 EXT4_I(inode
)->jinode
= NULL
;
1021 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
1022 u64 ino
, u32 generation
)
1024 struct inode
*inode
;
1026 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
1027 return ERR_PTR(-ESTALE
);
1028 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
1029 return ERR_PTR(-ESTALE
);
1031 /* iget isn't really right if the inode is currently unallocated!!
1033 * ext4_read_inode will return a bad_inode if the inode had been
1034 * deleted, so we should be safe.
1036 * Currently we don't know the generation for parent directory, so
1037 * a generation of 0 means "accept any"
1039 inode
= ext4_iget(sb
, ino
);
1041 return ERR_CAST(inode
);
1042 if (generation
&& inode
->i_generation
!= generation
) {
1044 return ERR_PTR(-ESTALE
);
1050 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
1051 int fh_len
, int fh_type
)
1053 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
1054 ext4_nfs_get_inode
);
1057 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
1058 int fh_len
, int fh_type
)
1060 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
1061 ext4_nfs_get_inode
);
1065 * Try to release metadata pages (indirect blocks, directories) which are
1066 * mapped via the block device. Since these pages could have journal heads
1067 * which would prevent try_to_free_buffers() from freeing them, we must use
1068 * jbd2 layer's try_to_free_buffers() function to release them.
1070 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
1073 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
1075 WARN_ON(PageChecked(page
));
1076 if (!page_has_buffers(page
))
1079 return jbd2_journal_try_to_free_buffers(journal
, page
,
1080 wait
& ~__GFP_WAIT
);
1081 return try_to_free_buffers(page
);
1085 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1086 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1088 static int ext4_write_dquot(struct dquot
*dquot
);
1089 static int ext4_acquire_dquot(struct dquot
*dquot
);
1090 static int ext4_release_dquot(struct dquot
*dquot
);
1091 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1092 static int ext4_write_info(struct super_block
*sb
, int type
);
1093 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1095 static int ext4_quota_off(struct super_block
*sb
, int type
);
1096 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1097 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1098 size_t len
, loff_t off
);
1099 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1100 const char *data
, size_t len
, loff_t off
);
1102 static const struct dquot_operations ext4_quota_operations
= {
1103 .get_reserved_space
= ext4_get_reserved_space
,
1104 .write_dquot
= ext4_write_dquot
,
1105 .acquire_dquot
= ext4_acquire_dquot
,
1106 .release_dquot
= ext4_release_dquot
,
1107 .mark_dirty
= ext4_mark_dquot_dirty
,
1108 .write_info
= ext4_write_info
,
1109 .alloc_dquot
= dquot_alloc
,
1110 .destroy_dquot
= dquot_destroy
,
1113 static const struct quotactl_ops ext4_qctl_operations
= {
1114 .quota_on
= ext4_quota_on
,
1115 .quota_off
= ext4_quota_off
,
1116 .quota_sync
= dquot_quota_sync
,
1117 .get_info
= dquot_get_dqinfo
,
1118 .set_info
= dquot_set_dqinfo
,
1119 .get_dqblk
= dquot_get_dqblk
,
1120 .set_dqblk
= dquot_set_dqblk
1124 static const struct super_operations ext4_sops
= {
1125 .alloc_inode
= ext4_alloc_inode
,
1126 .destroy_inode
= ext4_destroy_inode
,
1127 .write_inode
= ext4_write_inode
,
1128 .dirty_inode
= ext4_dirty_inode
,
1129 .drop_inode
= ext4_drop_inode
,
1130 .evict_inode
= ext4_evict_inode
,
1131 .put_super
= ext4_put_super
,
1132 .sync_fs
= ext4_sync_fs
,
1133 .freeze_fs
= ext4_freeze
,
1134 .unfreeze_fs
= ext4_unfreeze
,
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 super_operations ext4_nojournal_sops
= {
1146 .alloc_inode
= ext4_alloc_inode
,
1147 .destroy_inode
= ext4_destroy_inode
,
1148 .write_inode
= ext4_write_inode
,
1149 .dirty_inode
= ext4_dirty_inode
,
1150 .drop_inode
= ext4_drop_inode
,
1151 .evict_inode
= ext4_evict_inode
,
1152 .write_super
= ext4_write_super
,
1153 .put_super
= ext4_put_super
,
1154 .statfs
= ext4_statfs
,
1155 .remount_fs
= ext4_remount
,
1156 .show_options
= ext4_show_options
,
1158 .quota_read
= ext4_quota_read
,
1159 .quota_write
= ext4_quota_write
,
1161 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1164 static const struct export_operations ext4_export_ops
= {
1165 .fh_to_dentry
= ext4_fh_to_dentry
,
1166 .fh_to_parent
= ext4_fh_to_parent
,
1167 .get_parent
= ext4_get_parent
,
1171 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1172 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1173 Opt_nouid32
, Opt_debug
, Opt_removed
,
1174 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1175 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
,
1176 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
,
1177 Opt_journal_dev
, Opt_journal_checksum
, Opt_journal_async_commit
,
1178 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1179 Opt_data_err_abort
, Opt_data_err_ignore
,
1180 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1181 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1182 Opt_noquota
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1183 Opt_usrquota
, Opt_grpquota
, Opt_i_version
,
1184 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
, Opt_mblk_io_submit
,
1185 Opt_nomblk_io_submit
, Opt_block_validity
, Opt_noblock_validity
,
1186 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1187 Opt_dioread_nolock
, Opt_dioread_lock
,
1188 Opt_discard
, Opt_nodiscard
, Opt_init_itable
, Opt_noinit_itable
,
1191 static const match_table_t tokens
= {
1192 {Opt_bsd_df
, "bsddf"},
1193 {Opt_minix_df
, "minixdf"},
1194 {Opt_grpid
, "grpid"},
1195 {Opt_grpid
, "bsdgroups"},
1196 {Opt_nogrpid
, "nogrpid"},
1197 {Opt_nogrpid
, "sysvgroups"},
1198 {Opt_resgid
, "resgid=%u"},
1199 {Opt_resuid
, "resuid=%u"},
1201 {Opt_err_cont
, "errors=continue"},
1202 {Opt_err_panic
, "errors=panic"},
1203 {Opt_err_ro
, "errors=remount-ro"},
1204 {Opt_nouid32
, "nouid32"},
1205 {Opt_debug
, "debug"},
1206 {Opt_removed
, "oldalloc"},
1207 {Opt_removed
, "orlov"},
1208 {Opt_user_xattr
, "user_xattr"},
1209 {Opt_nouser_xattr
, "nouser_xattr"},
1211 {Opt_noacl
, "noacl"},
1212 {Opt_noload
, "norecovery"},
1213 {Opt_noload
, "noload"},
1214 {Opt_removed
, "nobh"},
1215 {Opt_removed
, "bh"},
1216 {Opt_commit
, "commit=%u"},
1217 {Opt_min_batch_time
, "min_batch_time=%u"},
1218 {Opt_max_batch_time
, "max_batch_time=%u"},
1219 {Opt_journal_dev
, "journal_dev=%u"},
1220 {Opt_journal_checksum
, "journal_checksum"},
1221 {Opt_journal_async_commit
, "journal_async_commit"},
1222 {Opt_abort
, "abort"},
1223 {Opt_data_journal
, "data=journal"},
1224 {Opt_data_ordered
, "data=ordered"},
1225 {Opt_data_writeback
, "data=writeback"},
1226 {Opt_data_err_abort
, "data_err=abort"},
1227 {Opt_data_err_ignore
, "data_err=ignore"},
1228 {Opt_offusrjquota
, "usrjquota="},
1229 {Opt_usrjquota
, "usrjquota=%s"},
1230 {Opt_offgrpjquota
, "grpjquota="},
1231 {Opt_grpjquota
, "grpjquota=%s"},
1232 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1233 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1234 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1235 {Opt_grpquota
, "grpquota"},
1236 {Opt_noquota
, "noquota"},
1237 {Opt_quota
, "quota"},
1238 {Opt_usrquota
, "usrquota"},
1239 {Opt_barrier
, "barrier=%u"},
1240 {Opt_barrier
, "barrier"},
1241 {Opt_nobarrier
, "nobarrier"},
1242 {Opt_i_version
, "i_version"},
1243 {Opt_stripe
, "stripe=%u"},
1244 {Opt_delalloc
, "delalloc"},
1245 {Opt_nodelalloc
, "nodelalloc"},
1246 {Opt_mblk_io_submit
, "mblk_io_submit"},
1247 {Opt_nomblk_io_submit
, "nomblk_io_submit"},
1248 {Opt_block_validity
, "block_validity"},
1249 {Opt_noblock_validity
, "noblock_validity"},
1250 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1251 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1252 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1253 {Opt_auto_da_alloc
, "auto_da_alloc"},
1254 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1255 {Opt_dioread_nolock
, "dioread_nolock"},
1256 {Opt_dioread_lock
, "dioread_lock"},
1257 {Opt_discard
, "discard"},
1258 {Opt_nodiscard
, "nodiscard"},
1259 {Opt_init_itable
, "init_itable=%u"},
1260 {Opt_init_itable
, "init_itable"},
1261 {Opt_noinit_itable
, "noinit_itable"},
1262 {Opt_removed
, "check=none"}, /* mount option from ext2/3 */
1263 {Opt_removed
, "nocheck"}, /* mount option from ext2/3 */
1264 {Opt_removed
, "reservation"}, /* mount option from ext2/3 */
1265 {Opt_removed
, "noreservation"}, /* mount option from ext2/3 */
1266 {Opt_removed
, "journal=%u"}, /* mount option from ext2/3 */
1270 static ext4_fsblk_t
get_sb_block(void **data
)
1272 ext4_fsblk_t sb_block
;
1273 char *options
= (char *) *data
;
1275 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1276 return 1; /* Default location */
1279 /* TODO: use simple_strtoll with >32bit ext4 */
1280 sb_block
= simple_strtoul(options
, &options
, 0);
1281 if (*options
&& *options
!= ',') {
1282 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1286 if (*options
== ',')
1288 *data
= (void *) options
;
1293 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1294 static char deprecated_msg
[] = "Mount option \"%s\" will be removed by %s\n"
1295 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1298 static int set_qf_name(struct super_block
*sb
, int qtype
, substring_t
*args
)
1300 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1303 if (sb_any_quota_loaded(sb
) &&
1304 !sbi
->s_qf_names
[qtype
]) {
1305 ext4_msg(sb
, KERN_ERR
,
1306 "Cannot change journaled "
1307 "quota options when quota turned on");
1310 qname
= match_strdup(args
);
1312 ext4_msg(sb
, KERN_ERR
,
1313 "Not enough memory for storing quotafile name");
1316 if (sbi
->s_qf_names
[qtype
] &&
1317 strcmp(sbi
->s_qf_names
[qtype
], qname
)) {
1318 ext4_msg(sb
, KERN_ERR
,
1319 "%s quota file already specified", QTYPE2NAME(qtype
));
1323 sbi
->s_qf_names
[qtype
] = qname
;
1324 if (strchr(sbi
->s_qf_names
[qtype
], '/')) {
1325 ext4_msg(sb
, KERN_ERR
,
1326 "quotafile must be on filesystem root");
1327 kfree(sbi
->s_qf_names
[qtype
]);
1328 sbi
->s_qf_names
[qtype
] = NULL
;
1335 static int clear_qf_name(struct super_block
*sb
, int qtype
)
1338 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1340 if (sb_any_quota_loaded(sb
) &&
1341 sbi
->s_qf_names
[qtype
]) {
1342 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled quota options"
1343 " when quota turned on");
1347 * The space will be released later when all options are confirmed
1350 sbi
->s_qf_names
[qtype
] = NULL
;
1355 #define MOPT_SET 0x0001
1356 #define MOPT_CLEAR 0x0002
1357 #define MOPT_NOSUPPORT 0x0004
1358 #define MOPT_EXPLICIT 0x0008
1359 #define MOPT_CLEAR_ERR 0x0010
1360 #define MOPT_GTE0 0x0020
1363 #define MOPT_QFMT 0x0040
1365 #define MOPT_Q MOPT_NOSUPPORT
1366 #define MOPT_QFMT MOPT_NOSUPPORT
1368 #define MOPT_DATAJ 0x0080
1370 static const struct mount_opts
{
1374 } ext4_mount_opts
[] = {
1375 {Opt_minix_df
, EXT4_MOUNT_MINIX_DF
, MOPT_SET
},
1376 {Opt_bsd_df
, EXT4_MOUNT_MINIX_DF
, MOPT_CLEAR
},
1377 {Opt_grpid
, EXT4_MOUNT_GRPID
, MOPT_SET
},
1378 {Opt_nogrpid
, EXT4_MOUNT_GRPID
, MOPT_CLEAR
},
1379 {Opt_mblk_io_submit
, EXT4_MOUNT_MBLK_IO_SUBMIT
, MOPT_SET
},
1380 {Opt_nomblk_io_submit
, EXT4_MOUNT_MBLK_IO_SUBMIT
, MOPT_CLEAR
},
1381 {Opt_block_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_SET
},
1382 {Opt_noblock_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_CLEAR
},
1383 {Opt_dioread_nolock
, EXT4_MOUNT_DIOREAD_NOLOCK
, MOPT_SET
},
1384 {Opt_dioread_lock
, EXT4_MOUNT_DIOREAD_NOLOCK
, MOPT_CLEAR
},
1385 {Opt_discard
, EXT4_MOUNT_DISCARD
, MOPT_SET
},
1386 {Opt_nodiscard
, EXT4_MOUNT_DISCARD
, MOPT_CLEAR
},
1387 {Opt_delalloc
, EXT4_MOUNT_DELALLOC
, MOPT_SET
| MOPT_EXPLICIT
},
1388 {Opt_nodelalloc
, EXT4_MOUNT_DELALLOC
, MOPT_CLEAR
| MOPT_EXPLICIT
},
1389 {Opt_journal_checksum
, EXT4_MOUNT_JOURNAL_CHECKSUM
, MOPT_SET
},
1390 {Opt_journal_async_commit
, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT
|
1391 EXT4_MOUNT_JOURNAL_CHECKSUM
), MOPT_SET
},
1392 {Opt_noload
, EXT4_MOUNT_NOLOAD
, MOPT_SET
},
1393 {Opt_err_panic
, EXT4_MOUNT_ERRORS_PANIC
, MOPT_SET
| MOPT_CLEAR_ERR
},
1394 {Opt_err_ro
, EXT4_MOUNT_ERRORS_RO
, MOPT_SET
| MOPT_CLEAR_ERR
},
1395 {Opt_err_cont
, EXT4_MOUNT_ERRORS_CONT
, MOPT_SET
| MOPT_CLEAR_ERR
},
1396 {Opt_data_err_abort
, EXT4_MOUNT_DATA_ERR_ABORT
, MOPT_SET
},
1397 {Opt_data_err_ignore
, EXT4_MOUNT_DATA_ERR_ABORT
, 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_data_journal
, EXT4_MOUNT_JOURNAL_DATA
, MOPT_DATAJ
},
1410 {Opt_data_ordered
, EXT4_MOUNT_ORDERED_DATA
, MOPT_DATAJ
},
1411 {Opt_data_writeback
, EXT4_MOUNT_WRITEBACK_DATA
, MOPT_DATAJ
},
1412 #ifdef CONFIG_EXT4_FS_XATTR
1413 {Opt_user_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_SET
},
1414 {Opt_nouser_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_CLEAR
},
1416 {Opt_user_xattr
, 0, MOPT_NOSUPPORT
},
1417 {Opt_nouser_xattr
, 0, MOPT_NOSUPPORT
},
1419 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1420 {Opt_acl
, EXT4_MOUNT_POSIX_ACL
, MOPT_SET
},
1421 {Opt_noacl
, EXT4_MOUNT_POSIX_ACL
, MOPT_CLEAR
},
1423 {Opt_acl
, 0, MOPT_NOSUPPORT
},
1424 {Opt_noacl
, 0, MOPT_NOSUPPORT
},
1426 {Opt_nouid32
, EXT4_MOUNT_NO_UID32
, MOPT_SET
},
1427 {Opt_debug
, EXT4_MOUNT_DEBUG
, MOPT_SET
},
1428 {Opt_quota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
, MOPT_SET
| MOPT_Q
},
1429 {Opt_usrquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
,
1431 {Opt_grpquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_GRPQUOTA
,
1433 {Opt_noquota
, (EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
|
1434 EXT4_MOUNT_GRPQUOTA
), MOPT_CLEAR
| MOPT_Q
},
1435 {Opt_usrjquota
, 0, MOPT_Q
},
1436 {Opt_grpjquota
, 0, MOPT_Q
},
1437 {Opt_offusrjquota
, 0, MOPT_Q
},
1438 {Opt_offgrpjquota
, 0, MOPT_Q
},
1439 {Opt_jqfmt_vfsold
, QFMT_VFS_OLD
, MOPT_QFMT
},
1440 {Opt_jqfmt_vfsv0
, QFMT_VFS_V0
, MOPT_QFMT
},
1441 {Opt_jqfmt_vfsv1
, QFMT_VFS_V1
, MOPT_QFMT
},
1445 static int handle_mount_opt(struct super_block
*sb
, char *opt
, int token
,
1446 substring_t
*args
, unsigned long *journal_devnum
,
1447 unsigned int *journal_ioprio
, int is_remount
)
1449 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1450 const struct mount_opts
*m
;
1456 if (token
== Opt_usrjquota
)
1457 return set_qf_name(sb
, USRQUOTA
, &args
[0]);
1458 else if (token
== Opt_grpjquota
)
1459 return set_qf_name(sb
, GRPQUOTA
, &args
[0]);
1460 else if (token
== Opt_offusrjquota
)
1461 return clear_qf_name(sb
, USRQUOTA
);
1462 else if (token
== Opt_offgrpjquota
)
1463 return clear_qf_name(sb
, GRPQUOTA
);
1465 if (args
->from
&& match_int(args
, &arg
))
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
,
1476 "Ignoring removed %s option", opt
);
1479 uid
= make_kuid(current_user_ns(), arg
);
1480 if (!uid_valid(uid
)) {
1481 ext4_msg(sb
, KERN_ERR
, "Invalid uid value %d", arg
);
1484 sbi
->s_resuid
= uid
;
1487 gid
= make_kgid(current_user_ns(), arg
);
1488 if (!gid_valid(gid
)) {
1489 ext4_msg(sb
, KERN_ERR
, "Invalid gid value %d", arg
);
1492 sbi
->s_resgid
= gid
;
1495 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1498 sb
->s_flags
|= MS_I_VERSION
;
1500 case Opt_journal_dev
:
1502 ext4_msg(sb
, KERN_ERR
,
1503 "Cannot specify journal on remount");
1506 *journal_devnum
= arg
;
1508 case Opt_journal_ioprio
:
1509 if (arg
< 0 || arg
> 7)
1511 *journal_ioprio
= IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
, arg
);
1515 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++) {
1516 if (token
!= m
->token
)
1518 if (args
->from
&& (m
->flags
& MOPT_GTE0
) && (arg
< 0))
1520 if (m
->flags
& MOPT_EXPLICIT
)
1521 set_opt2(sb
, EXPLICIT_DELALLOC
);
1522 if (m
->flags
& MOPT_CLEAR_ERR
)
1523 clear_opt(sb
, ERRORS_MASK
);
1524 if (token
== Opt_noquota
&& sb_any_quota_loaded(sb
)) {
1525 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1526 "options when quota turned on");
1530 if (m
->flags
& MOPT_NOSUPPORT
) {
1531 ext4_msg(sb
, KERN_ERR
, "%s option not supported", opt
);
1532 } else if (token
== Opt_commit
) {
1534 arg
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1535 sbi
->s_commit_interval
= HZ
* arg
;
1536 } else if (token
== Opt_max_batch_time
) {
1538 arg
= EXT4_DEF_MAX_BATCH_TIME
;
1539 sbi
->s_max_batch_time
= arg
;
1540 } else if (token
== Opt_min_batch_time
) {
1541 sbi
->s_min_batch_time
= arg
;
1542 } else if (token
== Opt_inode_readahead_blks
) {
1543 if (arg
> (1 << 30))
1545 if (arg
&& !is_power_of_2(arg
)) {
1546 ext4_msg(sb
, KERN_ERR
,
1547 "EXT4-fs: inode_readahead_blks"
1548 " must be a power of 2");
1551 sbi
->s_inode_readahead_blks
= arg
;
1552 } else if (token
== Opt_init_itable
) {
1553 set_opt(sb
, INIT_INODE_TABLE
);
1555 arg
= EXT4_DEF_LI_WAIT_MULT
;
1556 sbi
->s_li_wait_mult
= arg
;
1557 } else if (token
== Opt_stripe
) {
1558 sbi
->s_stripe
= arg
;
1559 } else if (m
->flags
& MOPT_DATAJ
) {
1561 if (!sbi
->s_journal
)
1562 ext4_msg(sb
, KERN_WARNING
, "Remounting file system with no journal so ignoring journalled data option");
1563 else if (test_opt(sb
, DATA_FLAGS
) !=
1565 ext4_msg(sb
, KERN_ERR
,
1566 "Cannot change data mode on remount");
1570 clear_opt(sb
, DATA_FLAGS
);
1571 sbi
->s_mount_opt
|= m
->mount_opt
;
1574 } else if (m
->flags
& MOPT_QFMT
) {
1575 if (sb_any_quota_loaded(sb
) &&
1576 sbi
->s_jquota_fmt
!= m
->mount_opt
) {
1577 ext4_msg(sb
, KERN_ERR
, "Cannot "
1578 "change journaled quota options "
1579 "when quota turned on");
1582 sbi
->s_jquota_fmt
= m
->mount_opt
;
1587 if (m
->flags
& MOPT_CLEAR
)
1589 else if (unlikely(!(m
->flags
& MOPT_SET
))) {
1590 ext4_msg(sb
, KERN_WARNING
,
1591 "buggy handling of option %s", opt
);
1596 sbi
->s_mount_opt
|= m
->mount_opt
;
1598 sbi
->s_mount_opt
&= ~m
->mount_opt
;
1602 ext4_msg(sb
, KERN_ERR
, "Unrecognized mount option \"%s\" "
1603 "or missing value", opt
);
1607 static int parse_options(char *options
, struct super_block
*sb
,
1608 unsigned long *journal_devnum
,
1609 unsigned int *journal_ioprio
,
1613 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1616 substring_t args
[MAX_OPT_ARGS
];
1622 while ((p
= strsep(&options
, ",")) != NULL
) {
1626 * Initialize args struct so we know whether arg was
1627 * found; some options take optional arguments.
1629 args
[0].to
= args
[0].from
= 0;
1630 token
= match_token(p
, tokens
, args
);
1631 if (handle_mount_opt(sb
, p
, token
, args
, journal_devnum
,
1632 journal_ioprio
, is_remount
) < 0)
1636 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1637 if (test_opt(sb
, USRQUOTA
) && sbi
->s_qf_names
[USRQUOTA
])
1638 clear_opt(sb
, USRQUOTA
);
1640 if (test_opt(sb
, GRPQUOTA
) && sbi
->s_qf_names
[GRPQUOTA
])
1641 clear_opt(sb
, GRPQUOTA
);
1643 if (test_opt(sb
, GRPQUOTA
) || test_opt(sb
, USRQUOTA
)) {
1644 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1649 if (!sbi
->s_jquota_fmt
) {
1650 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1655 if (sbi
->s_jquota_fmt
) {
1656 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1657 "specified with no journaling "
1666 static inline void ext4_show_quota_options(struct seq_file
*seq
,
1667 struct super_block
*sb
)
1669 #if defined(CONFIG_QUOTA)
1670 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1672 if (sbi
->s_jquota_fmt
) {
1675 switch (sbi
->s_jquota_fmt
) {
1686 seq_printf(seq
, ",jqfmt=%s", fmtname
);
1689 if (sbi
->s_qf_names
[USRQUOTA
])
1690 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
1692 if (sbi
->s_qf_names
[GRPQUOTA
])
1693 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
1695 if (test_opt(sb
, USRQUOTA
))
1696 seq_puts(seq
, ",usrquota");
1698 if (test_opt(sb
, GRPQUOTA
))
1699 seq_puts(seq
, ",grpquota");
1703 static const char *token2str(int token
)
1705 static const struct match_token
*t
;
1707 for (t
= tokens
; t
->token
!= Opt_err
; t
++)
1708 if (t
->token
== token
&& !strchr(t
->pattern
, '='))
1715 * - it's set to a non-default value OR
1716 * - if the per-sb default is different from the global default
1718 static int _ext4_show_options(struct seq_file
*seq
, struct super_block
*sb
,
1721 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1722 struct ext4_super_block
*es
= sbi
->s_es
;
1723 int def_errors
, def_mount_opt
= nodefs
? 0 : sbi
->s_def_mount_opt
;
1724 const struct mount_opts
*m
;
1725 char sep
= nodefs
? '\n' : ',';
1727 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1728 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1730 if (sbi
->s_sb_block
!= 1)
1731 SEQ_OPTS_PRINT("sb=%llu", sbi
->s_sb_block
);
1733 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++) {
1734 int want_set
= m
->flags
& MOPT_SET
;
1735 if (((m
->flags
& (MOPT_SET
|MOPT_CLEAR
)) == 0) ||
1736 (m
->flags
& MOPT_CLEAR_ERR
))
1738 if (!(m
->mount_opt
& (sbi
->s_mount_opt
^ def_mount_opt
)))
1739 continue; /* skip if same as the default */
1741 (sbi
->s_mount_opt
& m
->mount_opt
) != m
->mount_opt
) ||
1742 (!want_set
&& (sbi
->s_mount_opt
& m
->mount_opt
)))
1743 continue; /* select Opt_noFoo vs Opt_Foo */
1744 SEQ_OPTS_PRINT("%s", token2str(m
->token
));
1747 if (nodefs
|| !uid_eq(sbi
->s_resuid
, make_kuid(&init_user_ns
, EXT4_DEF_RESUID
)) ||
1748 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
)
1749 SEQ_OPTS_PRINT("resuid=%u",
1750 from_kuid_munged(&init_user_ns
, sbi
->s_resuid
));
1751 if (nodefs
|| !gid_eq(sbi
->s_resgid
, make_kgid(&init_user_ns
, EXT4_DEF_RESGID
)) ||
1752 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
)
1753 SEQ_OPTS_PRINT("resgid=%u",
1754 from_kgid_munged(&init_user_ns
, sbi
->s_resgid
));
1755 def_errors
= nodefs
? -1 : le16_to_cpu(es
->s_errors
);
1756 if (test_opt(sb
, ERRORS_RO
) && def_errors
!= EXT4_ERRORS_RO
)
1757 SEQ_OPTS_PUTS("errors=remount-ro");
1758 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
1759 SEQ_OPTS_PUTS("errors=continue");
1760 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
1761 SEQ_OPTS_PUTS("errors=panic");
1762 if (nodefs
|| sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
)
1763 SEQ_OPTS_PRINT("commit=%lu", sbi
->s_commit_interval
/ HZ
);
1764 if (nodefs
|| sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
)
1765 SEQ_OPTS_PRINT("min_batch_time=%u", sbi
->s_min_batch_time
);
1766 if (nodefs
|| sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
)
1767 SEQ_OPTS_PRINT("max_batch_time=%u", sbi
->s_max_batch_time
);
1768 if (sb
->s_flags
& MS_I_VERSION
)
1769 SEQ_OPTS_PUTS("i_version");
1770 if (nodefs
|| sbi
->s_stripe
)
1771 SEQ_OPTS_PRINT("stripe=%lu", sbi
->s_stripe
);
1772 if (EXT4_MOUNT_DATA_FLAGS
& (sbi
->s_mount_opt
^ def_mount_opt
)) {
1773 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
1774 SEQ_OPTS_PUTS("data=journal");
1775 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
1776 SEQ_OPTS_PUTS("data=ordered");
1777 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
1778 SEQ_OPTS_PUTS("data=writeback");
1781 sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
1782 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1783 sbi
->s_inode_readahead_blks
);
1785 if (nodefs
|| (test_opt(sb
, INIT_INODE_TABLE
) &&
1786 (sbi
->s_li_wait_mult
!= EXT4_DEF_LI_WAIT_MULT
)))
1787 SEQ_OPTS_PRINT("init_itable=%u", sbi
->s_li_wait_mult
);
1789 ext4_show_quota_options(seq
, sb
);
1793 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
)
1795 return _ext4_show_options(seq
, root
->d_sb
, 0);
1798 static int options_seq_show(struct seq_file
*seq
, void *offset
)
1800 struct super_block
*sb
= seq
->private;
1803 seq_puts(seq
, (sb
->s_flags
& MS_RDONLY
) ? "ro" : "rw");
1804 rc
= _ext4_show_options(seq
, sb
, 1);
1805 seq_puts(seq
, "\n");
1809 static int options_open_fs(struct inode
*inode
, struct file
*file
)
1811 return single_open(file
, options_seq_show
, PDE(inode
)->data
);
1814 static const struct file_operations ext4_seq_options_fops
= {
1815 .owner
= THIS_MODULE
,
1816 .open
= options_open_fs
,
1818 .llseek
= seq_lseek
,
1819 .release
= single_release
,
1822 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1825 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1828 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1829 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
1830 "forcing read-only mode");
1835 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1836 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
1837 "running e2fsck is recommended");
1838 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1839 ext4_msg(sb
, KERN_WARNING
,
1840 "warning: mounting fs with errors, "
1841 "running e2fsck is recommended");
1842 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) > 0 &&
1843 le16_to_cpu(es
->s_mnt_count
) >=
1844 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1845 ext4_msg(sb
, KERN_WARNING
,
1846 "warning: maximal mount count reached, "
1847 "running e2fsck is recommended");
1848 else if (le32_to_cpu(es
->s_checkinterval
) &&
1849 (le32_to_cpu(es
->s_lastcheck
) +
1850 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1851 ext4_msg(sb
, KERN_WARNING
,
1852 "warning: checktime reached, "
1853 "running e2fsck is recommended");
1854 if (!sbi
->s_journal
)
1855 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1856 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1857 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1858 le16_add_cpu(&es
->s_mnt_count
, 1);
1859 es
->s_mtime
= cpu_to_le32(get_seconds());
1860 ext4_update_dynamic_rev(sb
);
1862 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1864 ext4_commit_super(sb
, 1);
1866 if (test_opt(sb
, DEBUG
))
1867 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
1868 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1870 sbi
->s_groups_count
,
1871 EXT4_BLOCKS_PER_GROUP(sb
),
1872 EXT4_INODES_PER_GROUP(sb
),
1873 sbi
->s_mount_opt
, sbi
->s_mount_opt2
);
1875 cleancache_init_fs(sb
);
1879 static int ext4_fill_flex_info(struct super_block
*sb
)
1881 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1882 struct ext4_group_desc
*gdp
= NULL
;
1883 ext4_group_t flex_group_count
;
1884 ext4_group_t flex_group
;
1885 unsigned int groups_per_flex
= 0;
1889 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1890 if (sbi
->s_log_groups_per_flex
< 1 || sbi
->s_log_groups_per_flex
> 31) {
1891 sbi
->s_log_groups_per_flex
= 0;
1894 groups_per_flex
= 1 << sbi
->s_log_groups_per_flex
;
1896 /* We allocate both existing and potentially added groups */
1897 flex_group_count
= ((sbi
->s_groups_count
+ groups_per_flex
- 1) +
1898 ((le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
) + 1) <<
1899 EXT4_DESC_PER_BLOCK_BITS(sb
))) / groups_per_flex
;
1900 size
= flex_group_count
* sizeof(struct flex_groups
);
1901 sbi
->s_flex_groups
= ext4_kvzalloc(size
, GFP_KERNEL
);
1902 if (sbi
->s_flex_groups
== NULL
) {
1903 ext4_msg(sb
, KERN_ERR
, "not enough memory for %u flex groups",
1908 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1909 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1911 flex_group
= ext4_flex_group(sbi
, i
);
1912 atomic_add(ext4_free_inodes_count(sb
, gdp
),
1913 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
1914 atomic_add(ext4_free_group_clusters(sb
, gdp
),
1915 &sbi
->s_flex_groups
[flex_group
].free_clusters
);
1916 atomic_add(ext4_used_dirs_count(sb
, gdp
),
1917 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
1925 __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
1926 struct ext4_group_desc
*gdp
)
1930 if (sbi
->s_es
->s_feature_ro_compat
&
1931 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) {
1932 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
1933 __le32 le_group
= cpu_to_le32(block_group
);
1935 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
1936 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
1937 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
1938 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
1939 /* for checksum of struct ext4_group_desc do the rest...*/
1940 if ((sbi
->s_es
->s_feature_incompat
&
1941 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
1942 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
1943 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
1944 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
1948 return cpu_to_le16(crc
);
1951 int ext4_group_desc_csum_verify(struct ext4_sb_info
*sbi
, __u32 block_group
,
1952 struct ext4_group_desc
*gdp
)
1954 if ((sbi
->s_es
->s_feature_ro_compat
&
1955 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) &&
1956 (gdp
->bg_checksum
!= ext4_group_desc_csum(sbi
, block_group
, gdp
)))
1962 /* Called at mount-time, super-block is locked */
1963 static int ext4_check_descriptors(struct super_block
*sb
,
1964 ext4_group_t
*first_not_zeroed
)
1966 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1967 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
1968 ext4_fsblk_t last_block
;
1969 ext4_fsblk_t block_bitmap
;
1970 ext4_fsblk_t inode_bitmap
;
1971 ext4_fsblk_t inode_table
;
1972 int flexbg_flag
= 0;
1973 ext4_group_t i
, grp
= sbi
->s_groups_count
;
1975 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
1978 ext4_debug("Checking group descriptors");
1980 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1981 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1983 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
1984 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
1986 last_block
= first_block
+
1987 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
1989 if ((grp
== sbi
->s_groups_count
) &&
1990 !(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
1993 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
1994 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
1995 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1996 "Block bitmap for group %u not in group "
1997 "(block %llu)!", i
, block_bitmap
);
2000 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
2001 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
2002 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2003 "Inode bitmap for group %u not in group "
2004 "(block %llu)!", i
, inode_bitmap
);
2007 inode_table
= ext4_inode_table(sb
, gdp
);
2008 if (inode_table
< first_block
||
2009 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
2010 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2011 "Inode table for group %u not in group "
2012 "(block %llu)!", i
, inode_table
);
2015 ext4_lock_group(sb
, i
);
2016 if (!ext4_group_desc_csum_verify(sbi
, i
, gdp
)) {
2017 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2018 "Checksum for group %u failed (%u!=%u)",
2019 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
2020 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
2021 if (!(sb
->s_flags
& MS_RDONLY
)) {
2022 ext4_unlock_group(sb
, i
);
2026 ext4_unlock_group(sb
, i
);
2028 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
2030 if (NULL
!= first_not_zeroed
)
2031 *first_not_zeroed
= grp
;
2033 ext4_free_blocks_count_set(sbi
->s_es
,
2034 EXT4_C2B(sbi
, ext4_count_free_clusters(sb
)));
2035 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
2039 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2040 * the superblock) which were deleted from all directories, but held open by
2041 * a process at the time of a crash. We walk the list and try to delete these
2042 * inodes at recovery time (only with a read-write filesystem).
2044 * In order to keep the orphan inode chain consistent during traversal (in
2045 * case of crash during recovery), we link each inode into the superblock
2046 * orphan list_head and handle it the same way as an inode deletion during
2047 * normal operation (which journals the operations for us).
2049 * We only do an iget() and an iput() on each inode, which is very safe if we
2050 * accidentally point at an in-use or already deleted inode. The worst that
2051 * can happen in this case is that we get a "bit already cleared" message from
2052 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2053 * e2fsck was run on this filesystem, and it must have already done the orphan
2054 * inode cleanup for us, so we can safely abort without any further action.
2056 static void ext4_orphan_cleanup(struct super_block
*sb
,
2057 struct ext4_super_block
*es
)
2059 unsigned int s_flags
= sb
->s_flags
;
2060 int nr_orphans
= 0, nr_truncates
= 0;
2064 if (!es
->s_last_orphan
) {
2065 jbd_debug(4, "no orphan inodes to clean up\n");
2069 if (bdev_read_only(sb
->s_bdev
)) {
2070 ext4_msg(sb
, KERN_ERR
, "write access "
2071 "unavailable, skipping orphan cleanup");
2075 /* Check if feature set would not allow a r/w mount */
2076 if (!ext4_feature_set_ok(sb
, 0)) {
2077 ext4_msg(sb
, KERN_INFO
, "Skipping orphan cleanup due to "
2078 "unknown ROCOMPAT features");
2082 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2083 if (es
->s_last_orphan
)
2084 jbd_debug(1, "Errors on filesystem, "
2085 "clearing orphan list.\n");
2086 es
->s_last_orphan
= 0;
2087 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2091 if (s_flags
& MS_RDONLY
) {
2092 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
2093 sb
->s_flags
&= ~MS_RDONLY
;
2096 /* Needed for iput() to work correctly and not trash data */
2097 sb
->s_flags
|= MS_ACTIVE
;
2098 /* Turn on quotas so that they are updated correctly */
2099 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2100 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
2101 int ret
= ext4_quota_on_mount(sb
, i
);
2103 ext4_msg(sb
, KERN_ERR
,
2104 "Cannot turn on journaled "
2105 "quota: error %d", ret
);
2110 while (es
->s_last_orphan
) {
2111 struct inode
*inode
;
2113 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
2114 if (IS_ERR(inode
)) {
2115 es
->s_last_orphan
= 0;
2119 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
2120 dquot_initialize(inode
);
2121 if (inode
->i_nlink
) {
2122 ext4_msg(sb
, KERN_DEBUG
,
2123 "%s: truncating inode %lu to %lld bytes",
2124 __func__
, inode
->i_ino
, inode
->i_size
);
2125 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2126 inode
->i_ino
, inode
->i_size
);
2127 ext4_truncate(inode
);
2130 ext4_msg(sb
, KERN_DEBUG
,
2131 "%s: deleting unreferenced inode %lu",
2132 __func__
, inode
->i_ino
);
2133 jbd_debug(2, "deleting unreferenced inode %lu\n",
2137 iput(inode
); /* The delete magic happens here! */
2140 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2143 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
2144 PLURAL(nr_orphans
));
2146 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
2147 PLURAL(nr_truncates
));
2149 /* Turn quotas off */
2150 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2151 if (sb_dqopt(sb
)->files
[i
])
2152 dquot_quota_off(sb
, i
);
2155 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
2159 * Maximal extent format file size.
2160 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2161 * extent format containers, within a sector_t, and within i_blocks
2162 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2163 * so that won't be a limiting factor.
2165 * However there is other limiting factor. We do store extents in the form
2166 * of starting block and length, hence the resulting length of the extent
2167 * covering maximum file size must fit into on-disk format containers as
2168 * well. Given that length is always by 1 unit bigger than max unit (because
2169 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2171 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2173 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
2176 loff_t upper_limit
= MAX_LFS_FILESIZE
;
2178 /* small i_blocks in vfs inode? */
2179 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2181 * CONFIG_LBDAF is not enabled implies the inode
2182 * i_block represent total blocks in 512 bytes
2183 * 32 == size of vfs inode i_blocks * 8
2185 upper_limit
= (1LL << 32) - 1;
2187 /* total blocks in file system block size */
2188 upper_limit
>>= (blkbits
- 9);
2189 upper_limit
<<= blkbits
;
2193 * 32-bit extent-start container, ee_block. We lower the maxbytes
2194 * by one fs block, so ee_len can cover the extent of maximum file
2197 res
= (1LL << 32) - 1;
2200 /* Sanity check against vm- & vfs- imposed limits */
2201 if (res
> upper_limit
)
2208 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2209 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2210 * We need to be 1 filesystem block less than the 2^48 sector limit.
2212 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2214 loff_t res
= EXT4_NDIR_BLOCKS
;
2217 /* This is calculated to be the largest file size for a dense, block
2218 * mapped file such that the file's total number of 512-byte sectors,
2219 * including data and all indirect blocks, does not exceed (2^48 - 1).
2221 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2222 * number of 512-byte sectors of the file.
2225 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2227 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2228 * the inode i_block field represents total file blocks in
2229 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2231 upper_limit
= (1LL << 32) - 1;
2233 /* total blocks in file system block size */
2234 upper_limit
>>= (bits
- 9);
2238 * We use 48 bit ext4_inode i_blocks
2239 * With EXT4_HUGE_FILE_FL set the i_blocks
2240 * represent total number of blocks in
2241 * file system block size
2243 upper_limit
= (1LL << 48) - 1;
2247 /* indirect blocks */
2249 /* double indirect blocks */
2250 meta_blocks
+= 1 + (1LL << (bits
-2));
2251 /* tripple indirect blocks */
2252 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2254 upper_limit
-= meta_blocks
;
2255 upper_limit
<<= bits
;
2257 res
+= 1LL << (bits
-2);
2258 res
+= 1LL << (2*(bits
-2));
2259 res
+= 1LL << (3*(bits
-2));
2261 if (res
> upper_limit
)
2264 if (res
> MAX_LFS_FILESIZE
)
2265 res
= MAX_LFS_FILESIZE
;
2270 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2271 ext4_fsblk_t logical_sb_block
, int nr
)
2273 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2274 ext4_group_t bg
, first_meta_bg
;
2277 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2279 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
2281 return logical_sb_block
+ nr
+ 1;
2282 bg
= sbi
->s_desc_per_block
* nr
;
2283 if (ext4_bg_has_super(sb
, bg
))
2286 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2290 * ext4_get_stripe_size: Get the stripe size.
2291 * @sbi: In memory super block info
2293 * If we have specified it via mount option, then
2294 * use the mount option value. If the value specified at mount time is
2295 * greater than the blocks per group use the super block value.
2296 * If the super block value is greater than blocks per group return 0.
2297 * Allocator needs it be less than blocks per group.
2300 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2302 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2303 unsigned long stripe_width
=
2304 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2307 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2308 ret
= sbi
->s_stripe
;
2309 else if (stripe_width
<= sbi
->s_blocks_per_group
)
2311 else if (stride
<= sbi
->s_blocks_per_group
)
2317 * If the stripe width is 1, this makes no sense and
2318 * we set it to 0 to turn off stripe handling code.
2329 struct attribute attr
;
2330 ssize_t (*show
)(struct ext4_attr
*, struct ext4_sb_info
*, char *);
2331 ssize_t (*store
)(struct ext4_attr
*, struct ext4_sb_info
*,
2332 const char *, size_t);
2336 static int parse_strtoul(const char *buf
,
2337 unsigned long max
, unsigned long *value
)
2341 *value
= simple_strtoul(skip_spaces(buf
), &endp
, 0);
2342 endp
= skip_spaces(endp
);
2343 if (*endp
|| *value
> max
)
2349 static ssize_t
delayed_allocation_blocks_show(struct ext4_attr
*a
,
2350 struct ext4_sb_info
*sbi
,
2353 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2355 percpu_counter_sum(&sbi
->s_dirtyclusters_counter
)));
2358 static ssize_t
session_write_kbytes_show(struct ext4_attr
*a
,
2359 struct ext4_sb_info
*sbi
, char *buf
)
2361 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2363 if (!sb
->s_bdev
->bd_part
)
2364 return snprintf(buf
, PAGE_SIZE
, "0\n");
2365 return snprintf(buf
, PAGE_SIZE
, "%lu\n",
2366 (part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2367 sbi
->s_sectors_written_start
) >> 1);
2370 static ssize_t
lifetime_write_kbytes_show(struct ext4_attr
*a
,
2371 struct ext4_sb_info
*sbi
, char *buf
)
2373 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2375 if (!sb
->s_bdev
->bd_part
)
2376 return snprintf(buf
, PAGE_SIZE
, "0\n");
2377 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2378 (unsigned long long)(sbi
->s_kbytes_written
+
2379 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2380 EXT4_SB(sb
)->s_sectors_written_start
) >> 1)));
2383 static ssize_t
inode_readahead_blks_store(struct ext4_attr
*a
,
2384 struct ext4_sb_info
*sbi
,
2385 const char *buf
, size_t count
)
2389 if (parse_strtoul(buf
, 0x40000000, &t
))
2392 if (t
&& !is_power_of_2(t
))
2395 sbi
->s_inode_readahead_blks
= t
;
2399 static ssize_t
sbi_ui_show(struct ext4_attr
*a
,
2400 struct ext4_sb_info
*sbi
, char *buf
)
2402 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2404 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
2407 static ssize_t
sbi_ui_store(struct ext4_attr
*a
,
2408 struct ext4_sb_info
*sbi
,
2409 const char *buf
, size_t count
)
2411 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2414 if (parse_strtoul(buf
, 0xffffffff, &t
))
2420 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2421 static struct ext4_attr ext4_attr_##_name = { \
2422 .attr = {.name = __stringify(_name), .mode = _mode }, \
2425 .offset = offsetof(struct ext4_sb_info, _elname), \
2427 #define EXT4_ATTR(name, mode, show, store) \
2428 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2430 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2431 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2432 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2433 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2434 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2435 #define ATTR_LIST(name) &ext4_attr_##name.attr
2437 EXT4_RO_ATTR(delayed_allocation_blocks
);
2438 EXT4_RO_ATTR(session_write_kbytes
);
2439 EXT4_RO_ATTR(lifetime_write_kbytes
);
2440 EXT4_ATTR_OFFSET(inode_readahead_blks
, 0644, sbi_ui_show
,
2441 inode_readahead_blks_store
, s_inode_readahead_blks
);
2442 EXT4_RW_ATTR_SBI_UI(inode_goal
, s_inode_goal
);
2443 EXT4_RW_ATTR_SBI_UI(mb_stats
, s_mb_stats
);
2444 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan
, s_mb_max_to_scan
);
2445 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan
, s_mb_min_to_scan
);
2446 EXT4_RW_ATTR_SBI_UI(mb_order2_req
, s_mb_order2_reqs
);
2447 EXT4_RW_ATTR_SBI_UI(mb_stream_req
, s_mb_stream_request
);
2448 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc
, s_mb_group_prealloc
);
2449 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump
, s_max_writeback_mb_bump
);
2451 static struct attribute
*ext4_attrs
[] = {
2452 ATTR_LIST(delayed_allocation_blocks
),
2453 ATTR_LIST(session_write_kbytes
),
2454 ATTR_LIST(lifetime_write_kbytes
),
2455 ATTR_LIST(inode_readahead_blks
),
2456 ATTR_LIST(inode_goal
),
2457 ATTR_LIST(mb_stats
),
2458 ATTR_LIST(mb_max_to_scan
),
2459 ATTR_LIST(mb_min_to_scan
),
2460 ATTR_LIST(mb_order2_req
),
2461 ATTR_LIST(mb_stream_req
),
2462 ATTR_LIST(mb_group_prealloc
),
2463 ATTR_LIST(max_writeback_mb_bump
),
2467 /* Features this copy of ext4 supports */
2468 EXT4_INFO_ATTR(lazy_itable_init
);
2469 EXT4_INFO_ATTR(batched_discard
);
2471 static struct attribute
*ext4_feat_attrs
[] = {
2472 ATTR_LIST(lazy_itable_init
),
2473 ATTR_LIST(batched_discard
),
2477 static ssize_t
ext4_attr_show(struct kobject
*kobj
,
2478 struct attribute
*attr
, char *buf
)
2480 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2482 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2484 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
2487 static ssize_t
ext4_attr_store(struct kobject
*kobj
,
2488 struct attribute
*attr
,
2489 const char *buf
, size_t len
)
2491 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2493 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2495 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
2498 static void ext4_sb_release(struct kobject
*kobj
)
2500 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2502 complete(&sbi
->s_kobj_unregister
);
2505 static const struct sysfs_ops ext4_attr_ops
= {
2506 .show
= ext4_attr_show
,
2507 .store
= ext4_attr_store
,
2510 static struct kobj_type ext4_ktype
= {
2511 .default_attrs
= ext4_attrs
,
2512 .sysfs_ops
= &ext4_attr_ops
,
2513 .release
= ext4_sb_release
,
2516 static void ext4_feat_release(struct kobject
*kobj
)
2518 complete(&ext4_feat
->f_kobj_unregister
);
2521 static struct kobj_type ext4_feat_ktype
= {
2522 .default_attrs
= ext4_feat_attrs
,
2523 .sysfs_ops
= &ext4_attr_ops
,
2524 .release
= ext4_feat_release
,
2528 * Check whether this filesystem can be mounted based on
2529 * the features present and the RDONLY/RDWR mount requested.
2530 * Returns 1 if this filesystem can be mounted as requested,
2531 * 0 if it cannot be.
2533 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2535 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
)) {
2536 ext4_msg(sb
, KERN_ERR
,
2537 "Couldn't mount because of "
2538 "unsupported optional features (%x)",
2539 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2540 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2547 /* Check that feature set is OK for a read-write mount */
2548 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
)) {
2549 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2550 "unsupported optional features (%x)",
2551 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2552 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2556 * Large file size enabled file system can only be mounted
2557 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2559 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
2560 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2561 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2562 "cannot be mounted RDWR without "
2567 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_BIGALLOC
) &&
2568 !EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_EXTENTS
)) {
2569 ext4_msg(sb
, KERN_ERR
,
2570 "Can't support bigalloc feature without "
2571 "extents feature\n");
2578 * This function is called once a day if we have errors logged
2579 * on the file system
2581 static void print_daily_error_info(unsigned long arg
)
2583 struct super_block
*sb
= (struct super_block
*) arg
;
2584 struct ext4_sb_info
*sbi
;
2585 struct ext4_super_block
*es
;
2590 if (es
->s_error_count
)
2591 ext4_msg(sb
, KERN_NOTICE
, "error count: %u",
2592 le32_to_cpu(es
->s_error_count
));
2593 if (es
->s_first_error_time
) {
2594 printk(KERN_NOTICE
"EXT4-fs (%s): initial error at %u: %.*s:%d",
2595 sb
->s_id
, le32_to_cpu(es
->s_first_error_time
),
2596 (int) sizeof(es
->s_first_error_func
),
2597 es
->s_first_error_func
,
2598 le32_to_cpu(es
->s_first_error_line
));
2599 if (es
->s_first_error_ino
)
2600 printk(": inode %u",
2601 le32_to_cpu(es
->s_first_error_ino
));
2602 if (es
->s_first_error_block
)
2603 printk(": block %llu", (unsigned long long)
2604 le64_to_cpu(es
->s_first_error_block
));
2607 if (es
->s_last_error_time
) {
2608 printk(KERN_NOTICE
"EXT4-fs (%s): last error at %u: %.*s:%d",
2609 sb
->s_id
, le32_to_cpu(es
->s_last_error_time
),
2610 (int) sizeof(es
->s_last_error_func
),
2611 es
->s_last_error_func
,
2612 le32_to_cpu(es
->s_last_error_line
));
2613 if (es
->s_last_error_ino
)
2614 printk(": inode %u",
2615 le32_to_cpu(es
->s_last_error_ino
));
2616 if (es
->s_last_error_block
)
2617 printk(": block %llu", (unsigned long long)
2618 le64_to_cpu(es
->s_last_error_block
));
2621 mod_timer(&sbi
->s_err_report
, jiffies
+ 24*60*60*HZ
); /* Once a day */
2624 /* Find next suitable group and run ext4_init_inode_table */
2625 static int ext4_run_li_request(struct ext4_li_request
*elr
)
2627 struct ext4_group_desc
*gdp
= NULL
;
2628 ext4_group_t group
, ngroups
;
2629 struct super_block
*sb
;
2630 unsigned long timeout
= 0;
2634 ngroups
= EXT4_SB(sb
)->s_groups_count
;
2636 for (group
= elr
->lr_next_group
; group
< ngroups
; group
++) {
2637 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2643 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2647 if (group
== ngroups
)
2652 ret
= ext4_init_inode_table(sb
, group
,
2653 elr
->lr_timeout
? 0 : 1);
2654 if (elr
->lr_timeout
== 0) {
2655 timeout
= (jiffies
- timeout
) *
2656 elr
->lr_sbi
->s_li_wait_mult
;
2657 elr
->lr_timeout
= timeout
;
2659 elr
->lr_next_sched
= jiffies
+ elr
->lr_timeout
;
2660 elr
->lr_next_group
= group
+ 1;
2667 * Remove lr_request from the list_request and free the
2668 * request structure. Should be called with li_list_mtx held
2670 static void ext4_remove_li_request(struct ext4_li_request
*elr
)
2672 struct ext4_sb_info
*sbi
;
2679 list_del(&elr
->lr_request
);
2680 sbi
->s_li_request
= NULL
;
2684 static void ext4_unregister_li_request(struct super_block
*sb
)
2686 mutex_lock(&ext4_li_mtx
);
2687 if (!ext4_li_info
) {
2688 mutex_unlock(&ext4_li_mtx
);
2692 mutex_lock(&ext4_li_info
->li_list_mtx
);
2693 ext4_remove_li_request(EXT4_SB(sb
)->s_li_request
);
2694 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2695 mutex_unlock(&ext4_li_mtx
);
2698 static struct task_struct
*ext4_lazyinit_task
;
2701 * This is the function where ext4lazyinit thread lives. It walks
2702 * through the request list searching for next scheduled filesystem.
2703 * When such a fs is found, run the lazy initialization request
2704 * (ext4_rn_li_request) and keep track of the time spend in this
2705 * function. Based on that time we compute next schedule time of
2706 * the request. When walking through the list is complete, compute
2707 * next waking time and put itself into sleep.
2709 static int ext4_lazyinit_thread(void *arg
)
2711 struct ext4_lazy_init
*eli
= (struct ext4_lazy_init
*)arg
;
2712 struct list_head
*pos
, *n
;
2713 struct ext4_li_request
*elr
;
2714 unsigned long next_wakeup
, cur
;
2716 BUG_ON(NULL
== eli
);
2720 next_wakeup
= MAX_JIFFY_OFFSET
;
2722 mutex_lock(&eli
->li_list_mtx
);
2723 if (list_empty(&eli
->li_request_list
)) {
2724 mutex_unlock(&eli
->li_list_mtx
);
2728 list_for_each_safe(pos
, n
, &eli
->li_request_list
) {
2729 elr
= list_entry(pos
, struct ext4_li_request
,
2732 if (time_after_eq(jiffies
, elr
->lr_next_sched
)) {
2733 if (ext4_run_li_request(elr
) != 0) {
2734 /* error, remove the lazy_init job */
2735 ext4_remove_li_request(elr
);
2740 if (time_before(elr
->lr_next_sched
, next_wakeup
))
2741 next_wakeup
= elr
->lr_next_sched
;
2743 mutex_unlock(&eli
->li_list_mtx
);
2748 if ((time_after_eq(cur
, next_wakeup
)) ||
2749 (MAX_JIFFY_OFFSET
== next_wakeup
)) {
2754 schedule_timeout_interruptible(next_wakeup
- cur
);
2756 if (kthread_should_stop()) {
2757 ext4_clear_request_list();
2764 * It looks like the request list is empty, but we need
2765 * to check it under the li_list_mtx lock, to prevent any
2766 * additions into it, and of course we should lock ext4_li_mtx
2767 * to atomically free the list and ext4_li_info, because at
2768 * this point another ext4 filesystem could be registering
2771 mutex_lock(&ext4_li_mtx
);
2772 mutex_lock(&eli
->li_list_mtx
);
2773 if (!list_empty(&eli
->li_request_list
)) {
2774 mutex_unlock(&eli
->li_list_mtx
);
2775 mutex_unlock(&ext4_li_mtx
);
2778 mutex_unlock(&eli
->li_list_mtx
);
2779 kfree(ext4_li_info
);
2780 ext4_li_info
= NULL
;
2781 mutex_unlock(&ext4_li_mtx
);
2786 static void ext4_clear_request_list(void)
2788 struct list_head
*pos
, *n
;
2789 struct ext4_li_request
*elr
;
2791 mutex_lock(&ext4_li_info
->li_list_mtx
);
2792 list_for_each_safe(pos
, n
, &ext4_li_info
->li_request_list
) {
2793 elr
= list_entry(pos
, struct ext4_li_request
,
2795 ext4_remove_li_request(elr
);
2797 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2800 static int ext4_run_lazyinit_thread(void)
2802 ext4_lazyinit_task
= kthread_run(ext4_lazyinit_thread
,
2803 ext4_li_info
, "ext4lazyinit");
2804 if (IS_ERR(ext4_lazyinit_task
)) {
2805 int err
= PTR_ERR(ext4_lazyinit_task
);
2806 ext4_clear_request_list();
2807 kfree(ext4_li_info
);
2808 ext4_li_info
= NULL
;
2809 printk(KERN_CRIT
"EXT4-fs: error %d creating inode table "
2810 "initialization thread\n",
2814 ext4_li_info
->li_state
|= EXT4_LAZYINIT_RUNNING
;
2819 * Check whether it make sense to run itable init. thread or not.
2820 * If there is at least one uninitialized inode table, return
2821 * corresponding group number, else the loop goes through all
2822 * groups and return total number of groups.
2824 static ext4_group_t
ext4_has_uninit_itable(struct super_block
*sb
)
2826 ext4_group_t group
, ngroups
= EXT4_SB(sb
)->s_groups_count
;
2827 struct ext4_group_desc
*gdp
= NULL
;
2829 for (group
= 0; group
< ngroups
; group
++) {
2830 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2834 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2841 static int ext4_li_info_new(void)
2843 struct ext4_lazy_init
*eli
= NULL
;
2845 eli
= kzalloc(sizeof(*eli
), GFP_KERNEL
);
2849 INIT_LIST_HEAD(&eli
->li_request_list
);
2850 mutex_init(&eli
->li_list_mtx
);
2852 eli
->li_state
|= EXT4_LAZYINIT_QUIT
;
2859 static struct ext4_li_request
*ext4_li_request_new(struct super_block
*sb
,
2862 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2863 struct ext4_li_request
*elr
;
2866 elr
= kzalloc(sizeof(*elr
), GFP_KERNEL
);
2872 elr
->lr_next_group
= start
;
2875 * Randomize first schedule time of the request to
2876 * spread the inode table initialization requests
2879 get_random_bytes(&rnd
, sizeof(rnd
));
2880 elr
->lr_next_sched
= jiffies
+ (unsigned long)rnd
%
2881 (EXT4_DEF_LI_MAX_START_DELAY
* HZ
);
2886 static int ext4_register_li_request(struct super_block
*sb
,
2887 ext4_group_t first_not_zeroed
)
2889 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2890 struct ext4_li_request
*elr
;
2891 ext4_group_t ngroups
= EXT4_SB(sb
)->s_groups_count
;
2894 if (sbi
->s_li_request
!= NULL
) {
2896 * Reset timeout so it can be computed again, because
2897 * s_li_wait_mult might have changed.
2899 sbi
->s_li_request
->lr_timeout
= 0;
2903 if (first_not_zeroed
== ngroups
||
2904 (sb
->s_flags
& MS_RDONLY
) ||
2905 !test_opt(sb
, INIT_INODE_TABLE
))
2908 elr
= ext4_li_request_new(sb
, first_not_zeroed
);
2912 mutex_lock(&ext4_li_mtx
);
2914 if (NULL
== ext4_li_info
) {
2915 ret
= ext4_li_info_new();
2920 mutex_lock(&ext4_li_info
->li_list_mtx
);
2921 list_add(&elr
->lr_request
, &ext4_li_info
->li_request_list
);
2922 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2924 sbi
->s_li_request
= elr
;
2926 * set elr to NULL here since it has been inserted to
2927 * the request_list and the removal and free of it is
2928 * handled by ext4_clear_request_list from now on.
2932 if (!(ext4_li_info
->li_state
& EXT4_LAZYINIT_RUNNING
)) {
2933 ret
= ext4_run_lazyinit_thread();
2938 mutex_unlock(&ext4_li_mtx
);
2945 * We do not need to lock anything since this is called on
2948 static void ext4_destroy_lazyinit_thread(void)
2951 * If thread exited earlier
2952 * there's nothing to be done.
2954 if (!ext4_li_info
|| !ext4_lazyinit_task
)
2957 kthread_stop(ext4_lazyinit_task
);
2960 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
2962 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
2963 struct buffer_head
*bh
;
2964 struct ext4_super_block
*es
= NULL
;
2965 struct ext4_sb_info
*sbi
;
2967 ext4_fsblk_t sb_block
= get_sb_block(&data
);
2968 ext4_fsblk_t logical_sb_block
;
2969 unsigned long offset
= 0;
2970 unsigned long journal_devnum
= 0;
2971 unsigned long def_mount_opts
;
2976 int blocksize
, clustersize
;
2977 unsigned int db_count
;
2979 int needs_recovery
, has_huge_files
, has_bigalloc
;
2982 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
2983 ext4_group_t first_not_zeroed
;
2985 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
2989 sbi
->s_blockgroup_lock
=
2990 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
2991 if (!sbi
->s_blockgroup_lock
) {
2995 sb
->s_fs_info
= sbi
;
2996 sbi
->s_mount_opt
= 0;
2997 sbi
->s_resuid
= make_kuid(&init_user_ns
, EXT4_DEF_RESUID
);
2998 sbi
->s_resgid
= make_kgid(&init_user_ns
, EXT4_DEF_RESGID
);
2999 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
3000 sbi
->s_sb_block
= sb_block
;
3001 if (sb
->s_bdev
->bd_part
)
3002 sbi
->s_sectors_written_start
=
3003 part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]);
3005 /* Cleanup superblock name */
3006 for (cp
= sb
->s_id
; (cp
= strchr(cp
, '/'));)
3010 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
3012 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
3017 * The ext4 superblock will not be buffer aligned for other than 1kB
3018 * block sizes. We need to calculate the offset from buffer start.
3020 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
3021 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3022 offset
= do_div(logical_sb_block
, blocksize
);
3024 logical_sb_block
= sb_block
;
3027 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
3028 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
3032 * Note: s_es must be initialized as soon as possible because
3033 * some ext4 macro-instructions depend on its value
3035 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
3037 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
3038 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
3040 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
3042 /* Set defaults before we parse the mount options */
3043 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
3044 set_opt(sb
, INIT_INODE_TABLE
);
3045 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
3047 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
3049 if (def_mount_opts
& EXT4_DEFM_UID16
)
3050 set_opt(sb
, NO_UID32
);
3051 /* xattr user namespace & acls are now defaulted on */
3052 #ifdef CONFIG_EXT4_FS_XATTR
3053 set_opt(sb
, XATTR_USER
);
3055 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3056 set_opt(sb
, POSIX_ACL
);
3058 set_opt(sb
, MBLK_IO_SUBMIT
);
3059 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
3060 set_opt(sb
, JOURNAL_DATA
);
3061 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
3062 set_opt(sb
, ORDERED_DATA
);
3063 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
3064 set_opt(sb
, WRITEBACK_DATA
);
3066 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
3067 set_opt(sb
, ERRORS_PANIC
);
3068 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
3069 set_opt(sb
, ERRORS_CONT
);
3071 set_opt(sb
, ERRORS_RO
);
3072 if (def_mount_opts
& EXT4_DEFM_BLOCK_VALIDITY
)
3073 set_opt(sb
, BLOCK_VALIDITY
);
3074 if (def_mount_opts
& EXT4_DEFM_DISCARD
)
3075 set_opt(sb
, DISCARD
);
3077 sbi
->s_resuid
= make_kuid(&init_user_ns
, le16_to_cpu(es
->s_def_resuid
));
3078 sbi
->s_resgid
= make_kgid(&init_user_ns
, le16_to_cpu(es
->s_def_resgid
));
3079 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
3080 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
3081 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
3083 if ((def_mount_opts
& EXT4_DEFM_NOBARRIER
) == 0)
3084 set_opt(sb
, BARRIER
);
3087 * enable delayed allocation by default
3088 * Use -o nodelalloc to turn it off
3090 if (!IS_EXT3_SB(sb
) &&
3091 ((def_mount_opts
& EXT4_DEFM_NODELALLOC
) == 0))
3092 set_opt(sb
, DELALLOC
);
3095 * set default s_li_wait_mult for lazyinit, for the case there is
3096 * no mount option specified.
3098 sbi
->s_li_wait_mult
= EXT4_DEF_LI_WAIT_MULT
;
3100 if (!parse_options((char *) sbi
->s_es
->s_mount_opts
, sb
,
3101 &journal_devnum
, &journal_ioprio
, 0)) {
3102 ext4_msg(sb
, KERN_WARNING
,
3103 "failed to parse options in superblock: %s",
3104 sbi
->s_es
->s_mount_opts
);
3106 sbi
->s_def_mount_opt
= sbi
->s_mount_opt
;
3107 if (!parse_options((char *) data
, sb
, &journal_devnum
,
3108 &journal_ioprio
, 0))
3111 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
3112 printk_once(KERN_WARNING
"EXT4-fs: Warning: mounting "
3113 "with data=journal disables delayed "
3114 "allocation and O_DIRECT support!\n");
3115 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
3116 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3117 "both data=journal and delalloc");
3120 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
3121 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3122 "both data=journal and delalloc");
3125 if (test_opt(sb
, DELALLOC
))
3126 clear_opt(sb
, DELALLOC
);
3129 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
3130 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
3131 if (blocksize
< PAGE_SIZE
) {
3132 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3133 "dioread_nolock if block size != PAGE_SIZE");
3138 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3139 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
3141 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
3142 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
3143 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
3144 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
3145 ext4_msg(sb
, KERN_WARNING
,
3146 "feature flags set on rev 0 fs, "
3147 "running e2fsck is recommended");
3149 if (IS_EXT2_SB(sb
)) {
3150 if (ext2_feature_set_ok(sb
))
3151 ext4_msg(sb
, KERN_INFO
, "mounting ext2 file system "
3152 "using the ext4 subsystem");
3154 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext2 due "
3155 "to feature incompatibilities");
3160 if (IS_EXT3_SB(sb
)) {
3161 if (ext3_feature_set_ok(sb
))
3162 ext4_msg(sb
, KERN_INFO
, "mounting ext3 file system "
3163 "using the ext4 subsystem");
3165 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext3 due "
3166 "to feature incompatibilities");
3172 * Check feature flags regardless of the revision level, since we
3173 * previously didn't change the revision level when setting the flags,
3174 * so there is a chance incompat flags are set on a rev 0 filesystem.
3176 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
3179 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
3180 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
3181 ext4_msg(sb
, KERN_ERR
,
3182 "Unsupported filesystem blocksize %d", blocksize
);
3186 if (sb
->s_blocksize
!= blocksize
) {
3187 /* Validate the filesystem blocksize */
3188 if (!sb_set_blocksize(sb
, blocksize
)) {
3189 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
3195 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3196 offset
= do_div(logical_sb_block
, blocksize
);
3197 bh
= sb_bread(sb
, logical_sb_block
);
3199 ext4_msg(sb
, KERN_ERR
,
3200 "Can't read superblock on 2nd try");
3203 es
= (struct ext4_super_block
*)(((char *)bh
->b_data
) + offset
);
3205 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
3206 ext4_msg(sb
, KERN_ERR
,
3207 "Magic mismatch, very weird!");
3212 has_huge_files
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3213 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
);
3214 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
3216 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
3218 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
3219 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
3220 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
3222 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
3223 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
3224 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
3225 (!is_power_of_2(sbi
->s_inode_size
)) ||
3226 (sbi
->s_inode_size
> blocksize
)) {
3227 ext4_msg(sb
, KERN_ERR
,
3228 "unsupported inode size: %d",
3232 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
3233 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
3236 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
3237 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
3238 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
3239 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
3240 !is_power_of_2(sbi
->s_desc_size
)) {
3241 ext4_msg(sb
, KERN_ERR
,
3242 "unsupported descriptor size %lu",
3247 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
3249 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
3250 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
3251 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
3254 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
3255 if (sbi
->s_inodes_per_block
== 0)
3257 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
3258 sbi
->s_inodes_per_block
;
3259 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
3261 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3262 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
3263 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
3265 for (i
= 0; i
< 4; i
++)
3266 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
3267 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
3268 i
= le32_to_cpu(es
->s_flags
);
3269 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
3270 sbi
->s_hash_unsigned
= 3;
3271 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
3272 #ifdef __CHAR_UNSIGNED__
3273 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
3274 sbi
->s_hash_unsigned
= 3;
3276 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
3280 /* Handle clustersize */
3281 clustersize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_cluster_size
);
3282 has_bigalloc
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3283 EXT4_FEATURE_RO_COMPAT_BIGALLOC
);
3285 if (clustersize
< blocksize
) {
3286 ext4_msg(sb
, KERN_ERR
,
3287 "cluster size (%d) smaller than "
3288 "block size (%d)", clustersize
, blocksize
);
3291 sbi
->s_cluster_bits
= le32_to_cpu(es
->s_log_cluster_size
) -
3292 le32_to_cpu(es
->s_log_block_size
);
3293 sbi
->s_clusters_per_group
=
3294 le32_to_cpu(es
->s_clusters_per_group
);
3295 if (sbi
->s_clusters_per_group
> blocksize
* 8) {
3296 ext4_msg(sb
, KERN_ERR
,
3297 "#clusters per group too big: %lu",
3298 sbi
->s_clusters_per_group
);
3301 if (sbi
->s_blocks_per_group
!=
3302 (sbi
->s_clusters_per_group
* (clustersize
/ blocksize
))) {
3303 ext4_msg(sb
, KERN_ERR
, "blocks per group (%lu) and "
3304 "clusters per group (%lu) inconsistent",
3305 sbi
->s_blocks_per_group
,
3306 sbi
->s_clusters_per_group
);
3310 if (clustersize
!= blocksize
) {
3311 ext4_warning(sb
, "fragment/cluster size (%d) != "
3312 "block size (%d)", clustersize
,
3314 clustersize
= blocksize
;
3316 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
3317 ext4_msg(sb
, KERN_ERR
,
3318 "#blocks per group too big: %lu",
3319 sbi
->s_blocks_per_group
);
3322 sbi
->s_clusters_per_group
= sbi
->s_blocks_per_group
;
3323 sbi
->s_cluster_bits
= 0;
3325 sbi
->s_cluster_ratio
= clustersize
/ blocksize
;
3327 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
3328 ext4_msg(sb
, KERN_ERR
,
3329 "#inodes per group too big: %lu",
3330 sbi
->s_inodes_per_group
);
3335 * Test whether we have more sectors than will fit in sector_t,
3336 * and whether the max offset is addressable by the page cache.
3338 err
= generic_check_addressable(sb
->s_blocksize_bits
,
3339 ext4_blocks_count(es
));
3341 ext4_msg(sb
, KERN_ERR
, "filesystem"
3342 " too large to mount safely on this system");
3343 if (sizeof(sector_t
) < 8)
3344 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
3349 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
3352 /* check blocks count against device size */
3353 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
3354 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
3355 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
3356 "exceeds size of device (%llu blocks)",
3357 ext4_blocks_count(es
), blocks_count
);
3362 * It makes no sense for the first data block to be beyond the end
3363 * of the filesystem.
3365 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
3366 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data "
3367 "block %u is beyond end of filesystem (%llu)",
3368 le32_to_cpu(es
->s_first_data_block
),
3369 ext4_blocks_count(es
));
3372 blocks_count
= (ext4_blocks_count(es
) -
3373 le32_to_cpu(es
->s_first_data_block
) +
3374 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
3375 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
3376 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
3377 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
3378 "(block count %llu, first data block %u, "
3379 "blocks per group %lu)", sbi
->s_groups_count
,
3380 ext4_blocks_count(es
),
3381 le32_to_cpu(es
->s_first_data_block
),
3382 EXT4_BLOCKS_PER_GROUP(sb
));
3385 sbi
->s_groups_count
= blocks_count
;
3386 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
3387 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
3388 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
3389 EXT4_DESC_PER_BLOCK(sb
);
3390 sbi
->s_group_desc
= ext4_kvmalloc(db_count
*
3391 sizeof(struct buffer_head
*),
3393 if (sbi
->s_group_desc
== NULL
) {
3394 ext4_msg(sb
, KERN_ERR
, "not enough memory");
3399 sbi
->s_proc
= proc_mkdir(sb
->s_id
, ext4_proc_root
);
3402 proc_create_data("options", S_IRUGO
, sbi
->s_proc
,
3403 &ext4_seq_options_fops
, sb
);
3405 bgl_lock_init(sbi
->s_blockgroup_lock
);
3407 for (i
= 0; i
< db_count
; i
++) {
3408 block
= descriptor_loc(sb
, logical_sb_block
, i
);
3409 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
3410 if (!sbi
->s_group_desc
[i
]) {
3411 ext4_msg(sb
, KERN_ERR
,
3412 "can't read group descriptor %d", i
);
3417 if (!ext4_check_descriptors(sb
, &first_not_zeroed
)) {
3418 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
3421 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
3422 if (!ext4_fill_flex_info(sb
)) {
3423 ext4_msg(sb
, KERN_ERR
,
3424 "unable to initialize "
3425 "flex_bg meta info!");
3429 sbi
->s_gdb_count
= db_count
;
3430 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
3431 spin_lock_init(&sbi
->s_next_gen_lock
);
3433 init_timer(&sbi
->s_err_report
);
3434 sbi
->s_err_report
.function
= print_daily_error_info
;
3435 sbi
->s_err_report
.data
= (unsigned long) sb
;
3437 err
= percpu_counter_init(&sbi
->s_freeclusters_counter
,
3438 ext4_count_free_clusters(sb
));
3440 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
3441 ext4_count_free_inodes(sb
));
3444 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
3445 ext4_count_dirs(sb
));
3448 err
= percpu_counter_init(&sbi
->s_dirtyclusters_counter
, 0);
3451 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
3455 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
3456 sbi
->s_max_writeback_mb_bump
= 128;
3459 * set up enough so that it can read an inode
3461 if (!test_opt(sb
, NOLOAD
) &&
3462 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
3463 sb
->s_op
= &ext4_sops
;
3465 sb
->s_op
= &ext4_nojournal_sops
;
3466 sb
->s_export_op
= &ext4_export_ops
;
3467 sb
->s_xattr
= ext4_xattr_handlers
;
3469 sb
->s_qcop
= &ext4_qctl_operations
;
3470 sb
->dq_op
= &ext4_quota_operations
;
3472 memcpy(sb
->s_uuid
, es
->s_uuid
, sizeof(es
->s_uuid
));
3474 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
3475 mutex_init(&sbi
->s_orphan_lock
);
3476 sbi
->s_resize_flags
= 0;
3480 needs_recovery
= (es
->s_last_orphan
!= 0 ||
3481 EXT4_HAS_INCOMPAT_FEATURE(sb
,
3482 EXT4_FEATURE_INCOMPAT_RECOVER
));
3484 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_MMP
) &&
3485 !(sb
->s_flags
& MS_RDONLY
))
3486 if (ext4_multi_mount_protect(sb
, le64_to_cpu(es
->s_mmp_block
)))
3490 * The first inode we look at is the journal inode. Don't try
3491 * root first: it may be modified in the journal!
3493 if (!test_opt(sb
, NOLOAD
) &&
3494 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
3495 if (ext4_load_journal(sb
, es
, journal_devnum
))
3497 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
3498 EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3499 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
3500 "suppressed and not mounted read-only");
3501 goto failed_mount_wq
;
3503 clear_opt(sb
, DATA_FLAGS
);
3504 sbi
->s_journal
= NULL
;
3509 if (ext4_blocks_count(es
) > 0xffffffffULL
&&
3510 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
3511 JBD2_FEATURE_INCOMPAT_64BIT
)) {
3512 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
3513 goto failed_mount_wq
;
3516 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
3517 jbd2_journal_set_features(sbi
->s_journal
,
3518 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
3519 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3520 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
3521 jbd2_journal_set_features(sbi
->s_journal
,
3522 JBD2_FEATURE_COMPAT_CHECKSUM
, 0, 0);
3523 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3524 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3526 jbd2_journal_clear_features(sbi
->s_journal
,
3527 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
3528 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3531 /* We have now updated the journal if required, so we can
3532 * validate the data journaling mode. */
3533 switch (test_opt(sb
, DATA_FLAGS
)) {
3535 /* No mode set, assume a default based on the journal
3536 * capabilities: ORDERED_DATA if the journal can
3537 * cope, else JOURNAL_DATA
3539 if (jbd2_journal_check_available_features
3540 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
3541 set_opt(sb
, ORDERED_DATA
);
3543 set_opt(sb
, JOURNAL_DATA
);
3546 case EXT4_MOUNT_ORDERED_DATA
:
3547 case EXT4_MOUNT_WRITEBACK_DATA
:
3548 if (!jbd2_journal_check_available_features
3549 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
3550 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
3551 "requested data journaling mode");
3552 goto failed_mount_wq
;
3557 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
3559 sbi
->s_journal
->j_commit_callback
= ext4_journal_commit_callback
;
3562 * The journal may have updated the bg summary counts, so we
3563 * need to update the global counters.
3565 percpu_counter_set(&sbi
->s_freeclusters_counter
,
3566 ext4_count_free_clusters(sb
));
3567 percpu_counter_set(&sbi
->s_freeinodes_counter
,
3568 ext4_count_free_inodes(sb
));
3569 percpu_counter_set(&sbi
->s_dirs_counter
,
3570 ext4_count_dirs(sb
));
3571 percpu_counter_set(&sbi
->s_dirtyclusters_counter
, 0);
3575 * The maximum number of concurrent works can be high and
3576 * concurrency isn't really necessary. Limit it to 1.
3578 EXT4_SB(sb
)->dio_unwritten_wq
=
3579 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM
| WQ_UNBOUND
, 1);
3580 if (!EXT4_SB(sb
)->dio_unwritten_wq
) {
3581 printk(KERN_ERR
"EXT4-fs: failed to create DIO workqueue\n");
3582 goto failed_mount_wq
;
3586 * The jbd2_journal_load will have done any necessary log recovery,
3587 * so we can safely mount the rest of the filesystem now.
3590 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
3592 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
3593 ret
= PTR_ERR(root
);
3597 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
3598 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
3602 sb
->s_root
= d_make_root(root
);
3604 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
3609 ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
);
3611 /* determine the minimum size of new large inodes, if present */
3612 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
3613 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
3614 EXT4_GOOD_OLD_INODE_SIZE
;
3615 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3616 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
3617 if (sbi
->s_want_extra_isize
<
3618 le16_to_cpu(es
->s_want_extra_isize
))
3619 sbi
->s_want_extra_isize
=
3620 le16_to_cpu(es
->s_want_extra_isize
);
3621 if (sbi
->s_want_extra_isize
<
3622 le16_to_cpu(es
->s_min_extra_isize
))
3623 sbi
->s_want_extra_isize
=
3624 le16_to_cpu(es
->s_min_extra_isize
);
3627 /* Check if enough inode space is available */
3628 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
3629 sbi
->s_inode_size
) {
3630 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
3631 EXT4_GOOD_OLD_INODE_SIZE
;
3632 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
3636 err
= ext4_setup_system_zone(sb
);
3638 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
3640 goto failed_mount4a
;
3644 err
= ext4_mb_init(sb
, needs_recovery
);
3646 ext4_msg(sb
, KERN_ERR
, "failed to initialize mballoc (%d)",
3651 err
= ext4_register_li_request(sb
, first_not_zeroed
);
3655 sbi
->s_kobj
.kset
= ext4_kset
;
3656 init_completion(&sbi
->s_kobj_unregister
);
3657 err
= kobject_init_and_add(&sbi
->s_kobj
, &ext4_ktype
, NULL
,
3662 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
3663 ext4_orphan_cleanup(sb
, es
);
3664 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
3665 if (needs_recovery
) {
3666 ext4_msg(sb
, KERN_INFO
, "recovery complete");
3667 ext4_mark_recovery_complete(sb
, es
);
3669 if (EXT4_SB(sb
)->s_journal
) {
3670 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
3671 descr
= " journalled data mode";
3672 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
3673 descr
= " ordered data mode";
3675 descr
= " writeback data mode";
3677 descr
= "out journal";
3679 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s. "
3680 "Opts: %s%s%s", descr
, sbi
->s_es
->s_mount_opts
,
3681 *sbi
->s_es
->s_mount_opts
? "; " : "", orig_data
);
3683 if (es
->s_error_count
)
3684 mod_timer(&sbi
->s_err_report
, jiffies
+ 300*HZ
); /* 5 minutes */
3691 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
3695 ext4_unregister_li_request(sb
);
3697 ext4_mb_release(sb
);
3699 ext4_ext_release(sb
);
3700 ext4_release_system_zone(sb
);
3705 ext4_msg(sb
, KERN_ERR
, "mount failed");
3706 destroy_workqueue(EXT4_SB(sb
)->dio_unwritten_wq
);
3708 if (sbi
->s_journal
) {
3709 jbd2_journal_destroy(sbi
->s_journal
);
3710 sbi
->s_journal
= NULL
;
3713 del_timer(&sbi
->s_err_report
);
3714 if (sbi
->s_flex_groups
)
3715 ext4_kvfree(sbi
->s_flex_groups
);
3716 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
3717 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
3718 percpu_counter_destroy(&sbi
->s_dirs_counter
);
3719 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
3721 kthread_stop(sbi
->s_mmp_tsk
);
3723 for (i
= 0; i
< db_count
; i
++)
3724 brelse(sbi
->s_group_desc
[i
]);
3725 ext4_kvfree(sbi
->s_group_desc
);
3728 remove_proc_entry("options", sbi
->s_proc
);
3729 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
3732 for (i
= 0; i
< MAXQUOTAS
; i
++)
3733 kfree(sbi
->s_qf_names
[i
]);
3735 ext4_blkdev_remove(sbi
);
3738 sb
->s_fs_info
= NULL
;
3739 kfree(sbi
->s_blockgroup_lock
);
3747 * Setup any per-fs journal parameters now. We'll do this both on
3748 * initial mount, once the journal has been initialised but before we've
3749 * done any recovery; and again on any subsequent remount.
3751 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
3753 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3755 journal
->j_commit_interval
= sbi
->s_commit_interval
;
3756 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
3757 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
3759 write_lock(&journal
->j_state_lock
);
3760 if (test_opt(sb
, BARRIER
))
3761 journal
->j_flags
|= JBD2_BARRIER
;
3763 journal
->j_flags
&= ~JBD2_BARRIER
;
3764 if (test_opt(sb
, DATA_ERR_ABORT
))
3765 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
3767 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
3768 write_unlock(&journal
->j_state_lock
);
3771 static journal_t
*ext4_get_journal(struct super_block
*sb
,
3772 unsigned int journal_inum
)
3774 struct inode
*journal_inode
;
3777 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3779 /* First, test for the existence of a valid inode on disk. Bad
3780 * things happen if we iget() an unused inode, as the subsequent
3781 * iput() will try to delete it. */
3783 journal_inode
= ext4_iget(sb
, journal_inum
);
3784 if (IS_ERR(journal_inode
)) {
3785 ext4_msg(sb
, KERN_ERR
, "no journal found");
3788 if (!journal_inode
->i_nlink
) {
3789 make_bad_inode(journal_inode
);
3790 iput(journal_inode
);
3791 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
3795 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3796 journal_inode
, journal_inode
->i_size
);
3797 if (!S_ISREG(journal_inode
->i_mode
)) {
3798 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
3799 iput(journal_inode
);
3803 journal
= jbd2_journal_init_inode(journal_inode
);
3805 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
3806 iput(journal_inode
);
3809 journal
->j_private
= sb
;
3810 ext4_init_journal_params(sb
, journal
);
3814 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
3817 struct buffer_head
*bh
;
3821 int hblock
, blocksize
;
3822 ext4_fsblk_t sb_block
;
3823 unsigned long offset
;
3824 struct ext4_super_block
*es
;
3825 struct block_device
*bdev
;
3827 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3829 bdev
= ext4_blkdev_get(j_dev
, sb
);
3833 blocksize
= sb
->s_blocksize
;
3834 hblock
= bdev_logical_block_size(bdev
);
3835 if (blocksize
< hblock
) {
3836 ext4_msg(sb
, KERN_ERR
,
3837 "blocksize too small for journal device");
3841 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
3842 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
3843 set_blocksize(bdev
, blocksize
);
3844 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
3845 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
3846 "external journal");
3850 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
3851 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
3852 !(le32_to_cpu(es
->s_feature_incompat
) &
3853 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
3854 ext4_msg(sb
, KERN_ERR
, "external journal has "
3860 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
3861 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
3866 len
= ext4_blocks_count(es
);
3867 start
= sb_block
+ 1;
3868 brelse(bh
); /* we're done with the superblock */
3870 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
3871 start
, len
, blocksize
);
3873 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
3876 journal
->j_private
= sb
;
3877 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
3878 wait_on_buffer(journal
->j_sb_buffer
);
3879 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
3880 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
3883 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
3884 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
3885 "user (unsupported) - %d",
3886 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
3889 EXT4_SB(sb
)->journal_bdev
= bdev
;
3890 ext4_init_journal_params(sb
, journal
);
3894 jbd2_journal_destroy(journal
);
3896 ext4_blkdev_put(bdev
);
3900 static int ext4_load_journal(struct super_block
*sb
,
3901 struct ext4_super_block
*es
,
3902 unsigned long journal_devnum
)
3905 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
3908 int really_read_only
;
3910 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3912 if (journal_devnum
&&
3913 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3914 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
3915 "numbers have changed");
3916 journal_dev
= new_decode_dev(journal_devnum
);
3918 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
3920 really_read_only
= bdev_read_only(sb
->s_bdev
);
3923 * Are we loading a blank journal or performing recovery after a
3924 * crash? For recovery, we need to check in advance whether we
3925 * can get read-write access to the device.
3927 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3928 if (sb
->s_flags
& MS_RDONLY
) {
3929 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
3930 "required on readonly filesystem");
3931 if (really_read_only
) {
3932 ext4_msg(sb
, KERN_ERR
, "write access "
3933 "unavailable, cannot proceed");
3936 ext4_msg(sb
, KERN_INFO
, "write access will "
3937 "be enabled during recovery");
3941 if (journal_inum
&& journal_dev
) {
3942 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
3943 "and inode journals!");
3948 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
3951 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
3955 if (!(journal
->j_flags
& JBD2_BARRIER
))
3956 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
3958 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
3959 err
= jbd2_journal_wipe(journal
, !really_read_only
);
3961 char *save
= kmalloc(EXT4_S_ERR_LEN
, GFP_KERNEL
);
3963 memcpy(save
, ((char *) es
) +
3964 EXT4_S_ERR_START
, EXT4_S_ERR_LEN
);
3965 err
= jbd2_journal_load(journal
);
3967 memcpy(((char *) es
) + EXT4_S_ERR_START
,
3968 save
, EXT4_S_ERR_LEN
);
3973 ext4_msg(sb
, KERN_ERR
, "error loading journal");
3974 jbd2_journal_destroy(journal
);
3978 EXT4_SB(sb
)->s_journal
= journal
;
3979 ext4_clear_journal_err(sb
, es
);
3981 if (!really_read_only
&& journal_devnum
&&
3982 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3983 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
3985 /* Make sure we flush the recovery flag to disk. */
3986 ext4_commit_super(sb
, 1);
3992 static int ext4_commit_super(struct super_block
*sb
, int sync
)
3994 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
3995 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
3998 if (!sbh
|| block_device_ejected(sb
))
4000 if (buffer_write_io_error(sbh
)) {
4002 * Oh, dear. A previous attempt to write the
4003 * superblock failed. This could happen because the
4004 * USB device was yanked out. Or it could happen to
4005 * be a transient write error and maybe the block will
4006 * be remapped. Nothing we can do but to retry the
4007 * write and hope for the best.
4009 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
4010 "superblock detected");
4011 clear_buffer_write_io_error(sbh
);
4012 set_buffer_uptodate(sbh
);
4015 * If the file system is mounted read-only, don't update the
4016 * superblock write time. This avoids updating the superblock
4017 * write time when we are mounting the root file system
4018 * read/only but we need to replay the journal; at that point,
4019 * for people who are east of GMT and who make their clock
4020 * tick in localtime for Windows bug-for-bug compatibility,
4021 * the clock is set in the future, and this will cause e2fsck
4022 * to complain and force a full file system check.
4024 if (!(sb
->s_flags
& MS_RDONLY
))
4025 es
->s_wtime
= cpu_to_le32(get_seconds());
4026 if (sb
->s_bdev
->bd_part
)
4027 es
->s_kbytes_written
=
4028 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
4029 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
4030 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
4032 es
->s_kbytes_written
=
4033 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
);
4034 ext4_free_blocks_count_set(es
,
4035 EXT4_C2B(EXT4_SB(sb
), percpu_counter_sum_positive(
4036 &EXT4_SB(sb
)->s_freeclusters_counter
)));
4037 es
->s_free_inodes_count
=
4038 cpu_to_le32(percpu_counter_sum_positive(
4039 &EXT4_SB(sb
)->s_freeinodes_counter
));
4041 BUFFER_TRACE(sbh
, "marking dirty");
4042 mark_buffer_dirty(sbh
);
4044 error
= sync_dirty_buffer(sbh
);
4048 error
= buffer_write_io_error(sbh
);
4050 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
4052 clear_buffer_write_io_error(sbh
);
4053 set_buffer_uptodate(sbh
);
4060 * Have we just finished recovery? If so, and if we are mounting (or
4061 * remounting) the filesystem readonly, then we will end up with a
4062 * consistent fs on disk. Record that fact.
4064 static void ext4_mark_recovery_complete(struct super_block
*sb
,
4065 struct ext4_super_block
*es
)
4067 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
4069 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
4070 BUG_ON(journal
!= NULL
);
4073 jbd2_journal_lock_updates(journal
);
4074 if (jbd2_journal_flush(journal
) < 0)
4077 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
4078 sb
->s_flags
& MS_RDONLY
) {
4079 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4080 ext4_commit_super(sb
, 1);
4084 jbd2_journal_unlock_updates(journal
);
4088 * If we are mounting (or read-write remounting) a filesystem whose journal
4089 * has recorded an error from a previous lifetime, move that error to the
4090 * main filesystem now.
4092 static void ext4_clear_journal_err(struct super_block
*sb
,
4093 struct ext4_super_block
*es
)
4099 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4101 journal
= EXT4_SB(sb
)->s_journal
;
4104 * Now check for any error status which may have been recorded in the
4105 * journal by a prior ext4_error() or ext4_abort()
4108 j_errno
= jbd2_journal_errno(journal
);
4112 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
4113 ext4_warning(sb
, "Filesystem error recorded "
4114 "from previous mount: %s", errstr
);
4115 ext4_warning(sb
, "Marking fs in need of filesystem check.");
4117 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
4118 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
4119 ext4_commit_super(sb
, 1);
4121 jbd2_journal_clear_err(journal
);
4126 * Force the running and committing transactions to commit,
4127 * and wait on the commit.
4129 int ext4_force_commit(struct super_block
*sb
)
4134 if (sb
->s_flags
& MS_RDONLY
)
4137 journal
= EXT4_SB(sb
)->s_journal
;
4139 vfs_check_frozen(sb
, SB_FREEZE_TRANS
);
4140 ret
= ext4_journal_force_commit(journal
);
4146 static void ext4_write_super(struct super_block
*sb
)
4149 ext4_commit_super(sb
, 1);
4153 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
4157 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4159 trace_ext4_sync_fs(sb
, wait
);
4160 flush_workqueue(sbi
->dio_unwritten_wq
);
4161 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
4163 jbd2_log_wait_commit(sbi
->s_journal
, target
);
4169 * LVM calls this function before a (read-only) snapshot is created. This
4170 * gives us a chance to flush the journal completely and mark the fs clean.
4172 * Note that only this function cannot bring a filesystem to be in a clean
4173 * state independently, because ext4 prevents a new handle from being started
4174 * by @sb->s_frozen, which stays in an upper layer. It thus needs help from
4177 static int ext4_freeze(struct super_block
*sb
)
4182 if (sb
->s_flags
& MS_RDONLY
)
4185 journal
= EXT4_SB(sb
)->s_journal
;
4187 /* Now we set up the journal barrier. */
4188 jbd2_journal_lock_updates(journal
);
4191 * Don't clear the needs_recovery flag if we failed to flush
4194 error
= jbd2_journal_flush(journal
);
4198 /* Journal blocked and flushed, clear needs_recovery flag. */
4199 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4200 error
= ext4_commit_super(sb
, 1);
4202 /* we rely on s_frozen to stop further updates */
4203 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
4208 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4209 * flag here, even though the filesystem is not technically dirty yet.
4211 static int ext4_unfreeze(struct super_block
*sb
)
4213 if (sb
->s_flags
& MS_RDONLY
)
4217 /* Reset the needs_recovery flag before the fs is unlocked. */
4218 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4219 ext4_commit_super(sb
, 1);
4225 * Structure to save mount options for ext4_remount's benefit
4227 struct ext4_mount_options
{
4228 unsigned long s_mount_opt
;
4229 unsigned long s_mount_opt2
;
4232 unsigned long s_commit_interval
;
4233 u32 s_min_batch_time
, s_max_batch_time
;
4236 char *s_qf_names
[MAXQUOTAS
];
4240 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
4242 struct ext4_super_block
*es
;
4243 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4244 unsigned long old_sb_flags
;
4245 struct ext4_mount_options old_opts
;
4246 int enable_quota
= 0;
4248 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
4253 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
4255 /* Store the original options */
4257 old_sb_flags
= sb
->s_flags
;
4258 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
4259 old_opts
.s_mount_opt2
= sbi
->s_mount_opt2
;
4260 old_opts
.s_resuid
= sbi
->s_resuid
;
4261 old_opts
.s_resgid
= sbi
->s_resgid
;
4262 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
4263 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
4264 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
4266 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
4267 for (i
= 0; i
< MAXQUOTAS
; i
++)
4268 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
4270 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
4271 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
4274 * Allow the "check" option to be passed as a remount option.
4276 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
, 1)) {
4281 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
4282 ext4_abort(sb
, "Abort forced by user");
4284 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
4285 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
4289 if (sbi
->s_journal
) {
4290 ext4_init_journal_params(sb
, sbi
->s_journal
);
4291 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
4294 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
)) {
4295 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
4300 if (*flags
& MS_RDONLY
) {
4301 err
= dquot_suspend(sb
, -1);
4306 * First of all, the unconditional stuff we have to do
4307 * to disable replay of the journal when we next remount
4309 sb
->s_flags
|= MS_RDONLY
;
4312 * OK, test if we are remounting a valid rw partition
4313 * readonly, and if so set the rdonly flag and then
4314 * mark the partition as valid again.
4316 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
4317 (sbi
->s_mount_state
& EXT4_VALID_FS
))
4318 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
4321 ext4_mark_recovery_complete(sb
, es
);
4323 /* Make sure we can mount this feature set readwrite */
4324 if (!ext4_feature_set_ok(sb
, 0)) {
4329 * Make sure the group descriptor checksums
4330 * are sane. If they aren't, refuse to remount r/w.
4332 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
4333 struct ext4_group_desc
*gdp
=
4334 ext4_get_group_desc(sb
, g
, NULL
);
4336 if (!ext4_group_desc_csum_verify(sbi
, g
, gdp
)) {
4337 ext4_msg(sb
, KERN_ERR
,
4338 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4339 g
, le16_to_cpu(ext4_group_desc_csum(sbi
, g
, gdp
)),
4340 le16_to_cpu(gdp
->bg_checksum
));
4347 * If we have an unprocessed orphan list hanging
4348 * around from a previously readonly bdev mount,
4349 * require a full umount/remount for now.
4351 if (es
->s_last_orphan
) {
4352 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
4353 "remount RDWR because of unprocessed "
4354 "orphan inode list. Please "
4355 "umount/remount instead");
4361 * Mounting a RDONLY partition read-write, so reread
4362 * and store the current valid flag. (It may have
4363 * been changed by e2fsck since we originally mounted
4367 ext4_clear_journal_err(sb
, es
);
4368 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
4369 if (!ext4_setup_super(sb
, es
, 0))
4370 sb
->s_flags
&= ~MS_RDONLY
;
4371 if (EXT4_HAS_INCOMPAT_FEATURE(sb
,
4372 EXT4_FEATURE_INCOMPAT_MMP
))
4373 if (ext4_multi_mount_protect(sb
,
4374 le64_to_cpu(es
->s_mmp_block
))) {
4383 * Reinitialize lazy itable initialization thread based on
4386 if ((sb
->s_flags
& MS_RDONLY
) || !test_opt(sb
, INIT_INODE_TABLE
))
4387 ext4_unregister_li_request(sb
);
4389 ext4_group_t first_not_zeroed
;
4390 first_not_zeroed
= ext4_has_uninit_itable(sb
);
4391 ext4_register_li_request(sb
, first_not_zeroed
);
4394 ext4_setup_system_zone(sb
);
4395 if (sbi
->s_journal
== NULL
)
4396 ext4_commit_super(sb
, 1);
4399 /* Release old quota file names */
4400 for (i
= 0; i
< MAXQUOTAS
; i
++)
4401 if (old_opts
.s_qf_names
[i
] &&
4402 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
4403 kfree(old_opts
.s_qf_names
[i
]);
4407 dquot_resume(sb
, -1);
4409 ext4_msg(sb
, KERN_INFO
, "re-mounted. Opts: %s", orig_data
);
4414 sb
->s_flags
= old_sb_flags
;
4415 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
4416 sbi
->s_mount_opt2
= old_opts
.s_mount_opt2
;
4417 sbi
->s_resuid
= old_opts
.s_resuid
;
4418 sbi
->s_resgid
= old_opts
.s_resgid
;
4419 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
4420 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
4421 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
4423 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
4424 for (i
= 0; i
< MAXQUOTAS
; i
++) {
4425 if (sbi
->s_qf_names
[i
] &&
4426 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
4427 kfree(sbi
->s_qf_names
[i
]);
4428 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
4437 * Note: calculating the overhead so we can be compatible with
4438 * historical BSD practice is quite difficult in the face of
4439 * clusters/bigalloc. This is because multiple metadata blocks from
4440 * different block group can end up in the same allocation cluster.
4441 * Calculating the exact overhead in the face of clustered allocation
4442 * requires either O(all block bitmaps) in memory or O(number of block
4443 * groups**2) in time. We will still calculate the superblock for
4444 * older file systems --- and if we come across with a bigalloc file
4445 * system with zero in s_overhead_clusters the estimate will be close to
4446 * correct especially for very large cluster sizes --- but for newer
4447 * file systems, it's better to calculate this figure once at mkfs
4448 * time, and store it in the superblock. If the superblock value is
4449 * present (even for non-bigalloc file systems), we will use it.
4451 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
4453 struct super_block
*sb
= dentry
->d_sb
;
4454 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4455 struct ext4_super_block
*es
= sbi
->s_es
;
4456 struct ext4_group_desc
*gdp
;
4460 if (test_opt(sb
, MINIX_DF
)) {
4461 sbi
->s_overhead_last
= 0;
4462 } else if (es
->s_overhead_clusters
) {
4463 sbi
->s_overhead_last
= le32_to_cpu(es
->s_overhead_clusters
);
4464 } else if (sbi
->s_blocks_last
!= ext4_blocks_count(es
)) {
4465 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
4466 ext4_fsblk_t overhead
= 0;
4469 * Compute the overhead (FS structures). This is constant
4470 * for a given filesystem unless the number of block groups
4471 * changes so we cache the previous value until it does.
4475 * All of the blocks before first_data_block are
4478 overhead
= EXT4_B2C(sbi
, le32_to_cpu(es
->s_first_data_block
));
4481 * Add the overhead found in each block group
4483 for (i
= 0; i
< ngroups
; i
++) {
4484 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
4485 overhead
+= ext4_num_overhead_clusters(sb
, i
, gdp
);
4488 sbi
->s_overhead_last
= overhead
;
4490 sbi
->s_blocks_last
= ext4_blocks_count(es
);
4493 buf
->f_type
= EXT4_SUPER_MAGIC
;
4494 buf
->f_bsize
= sb
->s_blocksize
;
4495 buf
->f_blocks
= (ext4_blocks_count(es
) -
4496 EXT4_C2B(sbi
, sbi
->s_overhead_last
));
4497 bfree
= percpu_counter_sum_positive(&sbi
->s_freeclusters_counter
) -
4498 percpu_counter_sum_positive(&sbi
->s_dirtyclusters_counter
);
4499 /* prevent underflow in case that few free space is available */
4500 buf
->f_bfree
= EXT4_C2B(sbi
, max_t(s64
, bfree
, 0));
4501 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
4502 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
4504 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
4505 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
4506 buf
->f_namelen
= EXT4_NAME_LEN
;
4507 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
4508 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
4509 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
4510 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
4515 /* Helper function for writing quotas on sync - we need to start transaction
4516 * before quota file is locked for write. Otherwise the are possible deadlocks:
4517 * Process 1 Process 2
4518 * ext4_create() quota_sync()
4519 * jbd2_journal_start() write_dquot()
4520 * dquot_initialize() down(dqio_mutex)
4521 * down(dqio_mutex) jbd2_journal_start()
4527 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
4529 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_type
];
4532 static int ext4_write_dquot(struct dquot
*dquot
)
4536 struct inode
*inode
;
4538 inode
= dquot_to_inode(dquot
);
4539 handle
= ext4_journal_start(inode
,
4540 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
4542 return PTR_ERR(handle
);
4543 ret
= dquot_commit(dquot
);
4544 err
= ext4_journal_stop(handle
);
4550 static int ext4_acquire_dquot(struct dquot
*dquot
)
4555 handle
= ext4_journal_start(dquot_to_inode(dquot
),
4556 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
4558 return PTR_ERR(handle
);
4559 ret
= dquot_acquire(dquot
);
4560 err
= ext4_journal_stop(handle
);
4566 static int ext4_release_dquot(struct dquot
*dquot
)
4571 handle
= ext4_journal_start(dquot_to_inode(dquot
),
4572 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
4573 if (IS_ERR(handle
)) {
4574 /* Release dquot anyway to avoid endless cycle in dqput() */
4575 dquot_release(dquot
);
4576 return PTR_ERR(handle
);
4578 ret
= dquot_release(dquot
);
4579 err
= ext4_journal_stop(handle
);
4585 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
4587 /* Are we journaling quotas? */
4588 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
4589 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
4590 dquot_mark_dquot_dirty(dquot
);
4591 return ext4_write_dquot(dquot
);
4593 return dquot_mark_dquot_dirty(dquot
);
4597 static int ext4_write_info(struct super_block
*sb
, int type
)
4602 /* Data block + inode block */
4603 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
4605 return PTR_ERR(handle
);
4606 ret
= dquot_commit_info(sb
, type
);
4607 err
= ext4_journal_stop(handle
);
4614 * Turn on quotas during mount time - we need to find
4615 * the quota file and such...
4617 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
4619 return dquot_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
4620 EXT4_SB(sb
)->s_jquota_fmt
, type
);
4624 * Standard function to be called on quota_on
4626 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
4631 if (!test_opt(sb
, QUOTA
))
4634 /* Quotafile not on the same filesystem? */
4635 if (path
->dentry
->d_sb
!= sb
)
4637 /* Journaling quota? */
4638 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
4639 /* Quotafile not in fs root? */
4640 if (path
->dentry
->d_parent
!= sb
->s_root
)
4641 ext4_msg(sb
, KERN_WARNING
,
4642 "Quota file not on filesystem root. "
4643 "Journaled quota will not work");
4647 * When we journal data on quota file, we have to flush journal to see
4648 * all updates to the file when we bypass pagecache...
4650 if (EXT4_SB(sb
)->s_journal
&&
4651 ext4_should_journal_data(path
->dentry
->d_inode
)) {
4653 * We don't need to lock updates but journal_flush() could
4654 * otherwise be livelocked...
4656 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
4657 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
4658 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
4663 return dquot_quota_on(sb
, type
, format_id
, path
);
4666 static int ext4_quota_off(struct super_block
*sb
, int type
)
4668 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
4671 /* Force all delayed allocation blocks to be allocated.
4672 * Caller already holds s_umount sem */
4673 if (test_opt(sb
, DELALLOC
))
4674 sync_filesystem(sb
);
4679 /* Update modification times of quota files when userspace can
4680 * start looking at them */
4681 handle
= ext4_journal_start(inode
, 1);
4684 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
4685 ext4_mark_inode_dirty(handle
, inode
);
4686 ext4_journal_stop(handle
);
4689 return dquot_quota_off(sb
, type
);
4692 /* Read data from quotafile - avoid pagecache and such because we cannot afford
4693 * acquiring the locks... As quota files are never truncated and quota code
4694 * itself serializes the operations (and no one else should touch the files)
4695 * we don't have to be afraid of races */
4696 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
4697 size_t len
, loff_t off
)
4699 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
4700 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
4702 int offset
= off
& (sb
->s_blocksize
- 1);
4705 struct buffer_head
*bh
;
4706 loff_t i_size
= i_size_read(inode
);
4710 if (off
+len
> i_size
)
4713 while (toread
> 0) {
4714 tocopy
= sb
->s_blocksize
- offset
< toread
?
4715 sb
->s_blocksize
- offset
: toread
;
4716 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
4719 if (!bh
) /* A hole? */
4720 memset(data
, 0, tocopy
);
4722 memcpy(data
, bh
->b_data
+offset
, tocopy
);
4732 /* Write to quotafile (we know the transaction is already started and has
4733 * enough credits) */
4734 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
4735 const char *data
, size_t len
, loff_t off
)
4737 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
4738 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
4740 int offset
= off
& (sb
->s_blocksize
- 1);
4741 struct buffer_head
*bh
;
4742 handle_t
*handle
= journal_current_handle();
4744 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
4745 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
4746 " cancelled because transaction is not started",
4747 (unsigned long long)off
, (unsigned long long)len
);
4751 * Since we account only one data block in transaction credits,
4752 * then it is impossible to cross a block boundary.
4754 if (sb
->s_blocksize
- offset
< len
) {
4755 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
4756 " cancelled because not block aligned",
4757 (unsigned long long)off
, (unsigned long long)len
);
4761 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
4764 err
= ext4_journal_get_write_access(handle
, bh
);
4770 memcpy(bh
->b_data
+offset
, data
, len
);
4771 flush_dcache_page(bh
->b_page
);
4773 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
4778 if (inode
->i_size
< off
+ len
) {
4779 i_size_write(inode
, off
+ len
);
4780 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
4781 ext4_mark_inode_dirty(handle
, inode
);
4788 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
4789 const char *dev_name
, void *data
)
4791 return mount_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
);
4794 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4795 static inline void register_as_ext2(void)
4797 int err
= register_filesystem(&ext2_fs_type
);
4800 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
4803 static inline void unregister_as_ext2(void)
4805 unregister_filesystem(&ext2_fs_type
);
4808 static inline int ext2_feature_set_ok(struct super_block
*sb
)
4810 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT2_FEATURE_INCOMPAT_SUPP
))
4812 if (sb
->s_flags
& MS_RDONLY
)
4814 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT2_FEATURE_RO_COMPAT_SUPP
))
4818 MODULE_ALIAS("ext2");
4820 static inline void register_as_ext2(void) { }
4821 static inline void unregister_as_ext2(void) { }
4822 static inline int ext2_feature_set_ok(struct super_block
*sb
) { return 0; }
4825 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4826 static inline void register_as_ext3(void)
4828 int err
= register_filesystem(&ext3_fs_type
);
4831 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
4834 static inline void unregister_as_ext3(void)
4836 unregister_filesystem(&ext3_fs_type
);
4839 static inline int ext3_feature_set_ok(struct super_block
*sb
)
4841 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT3_FEATURE_INCOMPAT_SUPP
))
4843 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
4845 if (sb
->s_flags
& MS_RDONLY
)
4847 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT3_FEATURE_RO_COMPAT_SUPP
))
4851 MODULE_ALIAS("ext3");
4853 static inline void register_as_ext3(void) { }
4854 static inline void unregister_as_ext3(void) { }
4855 static inline int ext3_feature_set_ok(struct super_block
*sb
) { return 0; }
4858 static struct file_system_type ext4_fs_type
= {
4859 .owner
= THIS_MODULE
,
4861 .mount
= ext4_mount
,
4862 .kill_sb
= kill_block_super
,
4863 .fs_flags
= FS_REQUIRES_DEV
,
4866 static int __init
ext4_init_feat_adverts(void)
4868 struct ext4_features
*ef
;
4871 ef
= kzalloc(sizeof(struct ext4_features
), GFP_KERNEL
);
4875 ef
->f_kobj
.kset
= ext4_kset
;
4876 init_completion(&ef
->f_kobj_unregister
);
4877 ret
= kobject_init_and_add(&ef
->f_kobj
, &ext4_feat_ktype
, NULL
,
4890 static void ext4_exit_feat_adverts(void)
4892 kobject_put(&ext4_feat
->f_kobj
);
4893 wait_for_completion(&ext4_feat
->f_kobj_unregister
);
4897 /* Shared across all ext4 file systems */
4898 wait_queue_head_t ext4__ioend_wq
[EXT4_WQ_HASH_SZ
];
4899 struct mutex ext4__aio_mutex
[EXT4_WQ_HASH_SZ
];
4901 static int __init
ext4_init_fs(void)
4905 ext4_li_info
= NULL
;
4906 mutex_init(&ext4_li_mtx
);
4908 ext4_check_flag_values();
4910 for (i
= 0; i
< EXT4_WQ_HASH_SZ
; i
++) {
4911 mutex_init(&ext4__aio_mutex
[i
]);
4912 init_waitqueue_head(&ext4__ioend_wq
[i
]);
4915 err
= ext4_init_pageio();
4918 err
= ext4_init_system_zone();
4921 ext4_kset
= kset_create_and_add("ext4", NULL
, fs_kobj
);
4924 ext4_proc_root
= proc_mkdir("fs/ext4", NULL
);
4926 err
= ext4_init_feat_adverts();
4930 err
= ext4_init_mballoc();
4934 err
= ext4_init_xattr();
4937 err
= init_inodecache();
4942 err
= register_filesystem(&ext4_fs_type
);
4948 unregister_as_ext2();
4949 unregister_as_ext3();
4950 destroy_inodecache();
4954 ext4_exit_mballoc();
4956 ext4_exit_feat_adverts();
4959 remove_proc_entry("fs/ext4", NULL
);
4960 kset_unregister(ext4_kset
);
4962 ext4_exit_system_zone();
4968 static void __exit
ext4_exit_fs(void)
4970 ext4_destroy_lazyinit_thread();
4971 unregister_as_ext2();
4972 unregister_as_ext3();
4973 unregister_filesystem(&ext4_fs_type
);
4974 destroy_inodecache();
4976 ext4_exit_mballoc();
4977 ext4_exit_feat_adverts();
4978 remove_proc_entry("fs/ext4", NULL
);
4979 kset_unregister(ext4_kset
);
4980 ext4_exit_system_zone();
4984 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4985 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4986 MODULE_LICENSE("GPL");
4987 module_init(ext4_init_fs
)
4988 module_exit(ext4_exit_fs
)