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
"%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
);
518 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: inode #%lu: ",
519 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
);
521 printk(KERN_CONT
"block %llu: ", block
);
522 printk(KERN_CONT
"comm %s: %pV\n", current
->comm
, &vaf
);
525 ext4_handle_error(inode
->i_sb
);
528 void ext4_error_file(struct file
*file
, const char *function
,
529 unsigned int line
, ext4_fsblk_t block
,
530 const char *fmt
, ...)
533 struct va_format vaf
;
534 struct ext4_super_block
*es
;
535 struct inode
*inode
= file
->f_dentry
->d_inode
;
536 char pathname
[80], *path
;
538 es
= EXT4_SB(inode
->i_sb
)->s_es
;
539 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
540 save_error_info(inode
->i_sb
, function
, line
);
541 path
= d_path(&(file
->f_path
), pathname
, sizeof(pathname
));
545 "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
546 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
);
548 printk(KERN_CONT
"block %llu: ", block
);
552 printk(KERN_CONT
"comm %s: path %s: %pV\n", current
->comm
, path
, &vaf
);
555 ext4_handle_error(inode
->i_sb
);
558 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
565 errstr
= "IO failure";
568 errstr
= "Out of memory";
571 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
572 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
573 errstr
= "Journal has aborted";
575 errstr
= "Readonly filesystem";
578 /* If the caller passed in an extra buffer for unknown
579 * errors, textualise them now. Else we just return
582 /* Check for truncated error codes... */
583 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
592 /* __ext4_std_error decodes expected errors from journaling functions
593 * automatically and invokes the appropriate error response. */
595 void __ext4_std_error(struct super_block
*sb
, const char *function
,
596 unsigned int line
, int errno
)
601 /* Special case: if the error is EROFS, and we're not already
602 * inside a transaction, then there's really no point in logging
604 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
605 (sb
->s_flags
& MS_RDONLY
))
608 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
609 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s:%d: %s\n",
610 sb
->s_id
, function
, line
, errstr
);
611 save_error_info(sb
, function
, line
);
613 ext4_handle_error(sb
);
617 * ext4_abort is a much stronger failure handler than ext4_error. The
618 * abort function may be used to deal with unrecoverable failures such
619 * as journal IO errors or ENOMEM at a critical moment in log management.
621 * We unconditionally force the filesystem into an ABORT|READONLY state,
622 * unless the error response on the fs has been set to panic in which
623 * case we take the easy way out and panic immediately.
626 void __ext4_abort(struct super_block
*sb
, const char *function
,
627 unsigned int line
, const char *fmt
, ...)
631 save_error_info(sb
, function
, line
);
633 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: ", sb
->s_id
,
639 if ((sb
->s_flags
& MS_RDONLY
) == 0) {
640 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
641 sb
->s_flags
|= MS_RDONLY
;
642 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
643 if (EXT4_SB(sb
)->s_journal
)
644 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
645 save_error_info(sb
, function
, line
);
647 if (test_opt(sb
, ERRORS_PANIC
))
648 panic("EXT4-fs panic from previous error\n");
651 void ext4_msg(struct super_block
*sb
, const char *prefix
, const char *fmt
, ...)
653 struct va_format vaf
;
659 printk("%sEXT4-fs (%s): %pV\n", prefix
, sb
->s_id
, &vaf
);
663 void __ext4_warning(struct super_block
*sb
, const char *function
,
664 unsigned int line
, const char *fmt
, ...)
666 struct va_format vaf
;
672 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: %pV\n",
673 sb
->s_id
, function
, line
, &vaf
);
677 void __ext4_grp_locked_error(const char *function
, unsigned int line
,
678 struct super_block
*sb
, ext4_group_t grp
,
679 unsigned long ino
, ext4_fsblk_t block
,
680 const char *fmt
, ...)
684 struct va_format vaf
;
686 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
688 es
->s_last_error_ino
= cpu_to_le32(ino
);
689 es
->s_last_error_block
= cpu_to_le64(block
);
690 __save_error_info(sb
, function
, line
);
696 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: group %u, ",
697 sb
->s_id
, function
, line
, grp
);
699 printk(KERN_CONT
"inode %lu: ", ino
);
701 printk(KERN_CONT
"block %llu:", (unsigned long long) block
);
702 printk(KERN_CONT
"%pV\n", &vaf
);
705 if (test_opt(sb
, ERRORS_CONT
)) {
706 ext4_commit_super(sb
, 0);
710 ext4_unlock_group(sb
, grp
);
711 ext4_handle_error(sb
);
713 * We only get here in the ERRORS_RO case; relocking the group
714 * may be dangerous, but nothing bad will happen since the
715 * filesystem will have already been marked read/only and the
716 * journal has been aborted. We return 1 as a hint to callers
717 * who might what to use the return value from
718 * ext4_grp_locked_error() to distinguish between the
719 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
720 * aggressively from the ext4 function in question, with a
721 * more appropriate error code.
723 ext4_lock_group(sb
, grp
);
727 void ext4_update_dynamic_rev(struct super_block
*sb
)
729 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
731 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
735 "updating to rev %d because of new feature flag, "
736 "running e2fsck is recommended",
739 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
740 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
741 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
742 /* leave es->s_feature_*compat flags alone */
743 /* es->s_uuid will be set by e2fsck if empty */
746 * The rest of the superblock fields should be zero, and if not it
747 * means they are likely already in use, so leave them alone. We
748 * can leave it up to e2fsck to clean up any inconsistencies there.
753 * Open the external journal device
755 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
757 struct block_device
*bdev
;
758 char b
[BDEVNAME_SIZE
];
760 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
, sb
);
766 ext4_msg(sb
, KERN_ERR
, "failed to open journal device %s: %ld",
767 __bdevname(dev
, b
), PTR_ERR(bdev
));
772 * Release the journal device
774 static int ext4_blkdev_put(struct block_device
*bdev
)
776 return blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
779 static int ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
781 struct block_device
*bdev
;
784 bdev
= sbi
->journal_bdev
;
786 ret
= ext4_blkdev_put(bdev
);
787 sbi
->journal_bdev
= NULL
;
792 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
794 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
797 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
801 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
802 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
804 printk(KERN_ERR
"sb_info orphan list:\n");
805 list_for_each(l
, &sbi
->s_orphan
) {
806 struct inode
*inode
= orphan_list_entry(l
);
808 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
809 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
810 inode
->i_mode
, inode
->i_nlink
,
815 static void ext4_put_super(struct super_block
*sb
)
817 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
818 struct ext4_super_block
*es
= sbi
->s_es
;
821 ext4_unregister_li_request(sb
);
822 dquot_disable(sb
, -1, DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
824 flush_workqueue(sbi
->dio_unwritten_wq
);
825 destroy_workqueue(sbi
->dio_unwritten_wq
);
829 ext4_commit_super(sb
, 1);
831 if (sbi
->s_journal
) {
832 err
= jbd2_journal_destroy(sbi
->s_journal
);
833 sbi
->s_journal
= NULL
;
835 ext4_abort(sb
, "Couldn't clean up the journal");
838 del_timer(&sbi
->s_err_report
);
839 ext4_release_system_zone(sb
);
841 ext4_ext_release(sb
);
842 ext4_xattr_put_super(sb
);
844 if (!(sb
->s_flags
& MS_RDONLY
)) {
845 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
846 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
847 ext4_commit_super(sb
, 1);
850 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
852 kobject_del(&sbi
->s_kobj
);
854 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
855 brelse(sbi
->s_group_desc
[i
]);
856 ext4_kvfree(sbi
->s_group_desc
);
857 ext4_kvfree(sbi
->s_flex_groups
);
858 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
859 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
860 percpu_counter_destroy(&sbi
->s_dirs_counter
);
861 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
864 for (i
= 0; i
< MAXQUOTAS
; i
++)
865 kfree(sbi
->s_qf_names
[i
]);
868 /* Debugging code just in case the in-memory inode orphan list
869 * isn't empty. The on-disk one can be non-empty if we've
870 * detected an error and taken the fs readonly, but the
871 * in-memory list had better be clean by this point. */
872 if (!list_empty(&sbi
->s_orphan
))
873 dump_orphan_list(sb
, sbi
);
874 J_ASSERT(list_empty(&sbi
->s_orphan
));
876 invalidate_bdev(sb
->s_bdev
);
877 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
879 * Invalidate the journal device's buffers. We don't want them
880 * floating about in memory - the physical journal device may
881 * hotswapped, and it breaks the `ro-after' testing code.
883 sync_blockdev(sbi
->journal_bdev
);
884 invalidate_bdev(sbi
->journal_bdev
);
885 ext4_blkdev_remove(sbi
);
888 kthread_stop(sbi
->s_mmp_tsk
);
889 sb
->s_fs_info
= NULL
;
891 * Now that we are completely done shutting down the
892 * superblock, we need to actually destroy the kobject.
895 kobject_put(&sbi
->s_kobj
);
896 wait_for_completion(&sbi
->s_kobj_unregister
);
897 kfree(sbi
->s_blockgroup_lock
);
901 static struct kmem_cache
*ext4_inode_cachep
;
904 * Called inside transaction, so use GFP_NOFS
906 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
908 struct ext4_inode_info
*ei
;
910 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
914 ei
->vfs_inode
.i_version
= 1;
915 ei
->vfs_inode
.i_data
.writeback_index
= 0;
916 memset(&ei
->i_cached_extent
, 0, sizeof(struct ext4_ext_cache
));
917 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
918 spin_lock_init(&ei
->i_prealloc_lock
);
919 ei
->i_reserved_data_blocks
= 0;
920 ei
->i_reserved_meta_blocks
= 0;
921 ei
->i_allocated_meta_blocks
= 0;
922 ei
->i_da_metadata_calc_len
= 0;
923 spin_lock_init(&(ei
->i_block_reservation_lock
));
925 ei
->i_reserved_quota
= 0;
928 INIT_LIST_HEAD(&ei
->i_completed_io_list
);
929 spin_lock_init(&ei
->i_completed_io_lock
);
930 ei
->cur_aio_dio
= NULL
;
932 ei
->i_datasync_tid
= 0;
933 atomic_set(&ei
->i_ioend_count
, 0);
934 atomic_set(&ei
->i_aiodio_unwritten
, 0);
936 return &ei
->vfs_inode
;
939 static int ext4_drop_inode(struct inode
*inode
)
941 int drop
= generic_drop_inode(inode
);
943 trace_ext4_drop_inode(inode
, drop
);
947 static void ext4_i_callback(struct rcu_head
*head
)
949 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
950 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
953 static void ext4_destroy_inode(struct inode
*inode
)
955 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
956 ext4_msg(inode
->i_sb
, KERN_ERR
,
957 "Inode %lu (%p): orphan list check failed!",
958 inode
->i_ino
, EXT4_I(inode
));
959 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
960 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
964 call_rcu(&inode
->i_rcu
, ext4_i_callback
);
967 static void init_once(void *foo
)
969 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
971 INIT_LIST_HEAD(&ei
->i_orphan
);
972 #ifdef CONFIG_EXT4_FS_XATTR
973 init_rwsem(&ei
->xattr_sem
);
975 init_rwsem(&ei
->i_data_sem
);
976 inode_init_once(&ei
->vfs_inode
);
979 static int init_inodecache(void)
981 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
982 sizeof(struct ext4_inode_info
),
983 0, (SLAB_RECLAIM_ACCOUNT
|
986 if (ext4_inode_cachep
== NULL
)
991 static void destroy_inodecache(void)
993 kmem_cache_destroy(ext4_inode_cachep
);
996 void ext4_clear_inode(struct inode
*inode
)
998 invalidate_inode_buffers(inode
);
999 end_writeback(inode
);
1001 ext4_discard_preallocations(inode
);
1002 if (EXT4_I(inode
)->jinode
) {
1003 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode
),
1004 EXT4_I(inode
)->jinode
);
1005 jbd2_free_inode(EXT4_I(inode
)->jinode
);
1006 EXT4_I(inode
)->jinode
= NULL
;
1010 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
1011 u64 ino
, u32 generation
)
1013 struct inode
*inode
;
1015 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
1016 return ERR_PTR(-ESTALE
);
1017 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
1018 return ERR_PTR(-ESTALE
);
1020 /* iget isn't really right if the inode is currently unallocated!!
1022 * ext4_read_inode will return a bad_inode if the inode had been
1023 * deleted, so we should be safe.
1025 * Currently we don't know the generation for parent directory, so
1026 * a generation of 0 means "accept any"
1028 inode
= ext4_iget(sb
, ino
);
1030 return ERR_CAST(inode
);
1031 if (generation
&& inode
->i_generation
!= generation
) {
1033 return ERR_PTR(-ESTALE
);
1039 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
1040 int fh_len
, int fh_type
)
1042 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
1043 ext4_nfs_get_inode
);
1046 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
1047 int fh_len
, int fh_type
)
1049 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
1050 ext4_nfs_get_inode
);
1054 * Try to release metadata pages (indirect blocks, directories) which are
1055 * mapped via the block device. Since these pages could have journal heads
1056 * which would prevent try_to_free_buffers() from freeing them, we must use
1057 * jbd2 layer's try_to_free_buffers() function to release them.
1059 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
1062 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
1064 WARN_ON(PageChecked(page
));
1065 if (!page_has_buffers(page
))
1068 return jbd2_journal_try_to_free_buffers(journal
, page
,
1069 wait
& ~__GFP_WAIT
);
1070 return try_to_free_buffers(page
);
1074 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1075 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1077 static int ext4_write_dquot(struct dquot
*dquot
);
1078 static int ext4_acquire_dquot(struct dquot
*dquot
);
1079 static int ext4_release_dquot(struct dquot
*dquot
);
1080 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1081 static int ext4_write_info(struct super_block
*sb
, int type
);
1082 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1084 static int ext4_quota_off(struct super_block
*sb
, int type
);
1085 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1086 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1087 size_t len
, loff_t off
);
1088 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1089 const char *data
, size_t len
, loff_t off
);
1091 static const struct dquot_operations ext4_quota_operations
= {
1092 .get_reserved_space
= ext4_get_reserved_space
,
1093 .write_dquot
= ext4_write_dquot
,
1094 .acquire_dquot
= ext4_acquire_dquot
,
1095 .release_dquot
= ext4_release_dquot
,
1096 .mark_dirty
= ext4_mark_dquot_dirty
,
1097 .write_info
= ext4_write_info
,
1098 .alloc_dquot
= dquot_alloc
,
1099 .destroy_dquot
= dquot_destroy
,
1102 static const struct quotactl_ops ext4_qctl_operations
= {
1103 .quota_on
= ext4_quota_on
,
1104 .quota_off
= ext4_quota_off
,
1105 .quota_sync
= dquot_quota_sync
,
1106 .get_info
= dquot_get_dqinfo
,
1107 .set_info
= dquot_set_dqinfo
,
1108 .get_dqblk
= dquot_get_dqblk
,
1109 .set_dqblk
= dquot_set_dqblk
1113 static const struct super_operations ext4_sops
= {
1114 .alloc_inode
= ext4_alloc_inode
,
1115 .destroy_inode
= ext4_destroy_inode
,
1116 .write_inode
= ext4_write_inode
,
1117 .dirty_inode
= ext4_dirty_inode
,
1118 .drop_inode
= ext4_drop_inode
,
1119 .evict_inode
= ext4_evict_inode
,
1120 .put_super
= ext4_put_super
,
1121 .sync_fs
= ext4_sync_fs
,
1122 .freeze_fs
= ext4_freeze
,
1123 .unfreeze_fs
= ext4_unfreeze
,
1124 .statfs
= ext4_statfs
,
1125 .remount_fs
= ext4_remount
,
1126 .show_options
= ext4_show_options
,
1128 .quota_read
= ext4_quota_read
,
1129 .quota_write
= ext4_quota_write
,
1131 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1134 static const struct super_operations ext4_nojournal_sops
= {
1135 .alloc_inode
= ext4_alloc_inode
,
1136 .destroy_inode
= ext4_destroy_inode
,
1137 .write_inode
= ext4_write_inode
,
1138 .dirty_inode
= ext4_dirty_inode
,
1139 .drop_inode
= ext4_drop_inode
,
1140 .evict_inode
= ext4_evict_inode
,
1141 .write_super
= ext4_write_super
,
1142 .put_super
= ext4_put_super
,
1143 .statfs
= ext4_statfs
,
1144 .remount_fs
= ext4_remount
,
1145 .show_options
= ext4_show_options
,
1147 .quota_read
= ext4_quota_read
,
1148 .quota_write
= ext4_quota_write
,
1150 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1153 static const struct export_operations ext4_export_ops
= {
1154 .fh_to_dentry
= ext4_fh_to_dentry
,
1155 .fh_to_parent
= ext4_fh_to_parent
,
1156 .get_parent
= ext4_get_parent
,
1160 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1161 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1162 Opt_nouid32
, Opt_debug
, Opt_removed
,
1163 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1164 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
,
1165 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
,
1166 Opt_journal_dev
, Opt_journal_checksum
, Opt_journal_async_commit
,
1167 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1168 Opt_data_err_abort
, Opt_data_err_ignore
,
1169 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1170 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1171 Opt_noquota
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1172 Opt_usrquota
, Opt_grpquota
, Opt_i_version
,
1173 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
, Opt_mblk_io_submit
,
1174 Opt_nomblk_io_submit
, Opt_block_validity
, Opt_noblock_validity
,
1175 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1176 Opt_dioread_nolock
, Opt_dioread_lock
,
1177 Opt_discard
, Opt_nodiscard
, Opt_init_itable
, Opt_noinit_itable
,
1180 static const match_table_t tokens
= {
1181 {Opt_bsd_df
, "bsddf"},
1182 {Opt_minix_df
, "minixdf"},
1183 {Opt_grpid
, "grpid"},
1184 {Opt_grpid
, "bsdgroups"},
1185 {Opt_nogrpid
, "nogrpid"},
1186 {Opt_nogrpid
, "sysvgroups"},
1187 {Opt_resgid
, "resgid=%u"},
1188 {Opt_resuid
, "resuid=%u"},
1190 {Opt_err_cont
, "errors=continue"},
1191 {Opt_err_panic
, "errors=panic"},
1192 {Opt_err_ro
, "errors=remount-ro"},
1193 {Opt_nouid32
, "nouid32"},
1194 {Opt_debug
, "debug"},
1195 {Opt_removed
, "oldalloc"},
1196 {Opt_removed
, "orlov"},
1197 {Opt_user_xattr
, "user_xattr"},
1198 {Opt_nouser_xattr
, "nouser_xattr"},
1200 {Opt_noacl
, "noacl"},
1201 {Opt_noload
, "norecovery"},
1202 {Opt_noload
, "noload"},
1203 {Opt_removed
, "nobh"},
1204 {Opt_removed
, "bh"},
1205 {Opt_commit
, "commit=%u"},
1206 {Opt_min_batch_time
, "min_batch_time=%u"},
1207 {Opt_max_batch_time
, "max_batch_time=%u"},
1208 {Opt_journal_dev
, "journal_dev=%u"},
1209 {Opt_journal_checksum
, "journal_checksum"},
1210 {Opt_journal_async_commit
, "journal_async_commit"},
1211 {Opt_abort
, "abort"},
1212 {Opt_data_journal
, "data=journal"},
1213 {Opt_data_ordered
, "data=ordered"},
1214 {Opt_data_writeback
, "data=writeback"},
1215 {Opt_data_err_abort
, "data_err=abort"},
1216 {Opt_data_err_ignore
, "data_err=ignore"},
1217 {Opt_offusrjquota
, "usrjquota="},
1218 {Opt_usrjquota
, "usrjquota=%s"},
1219 {Opt_offgrpjquota
, "grpjquota="},
1220 {Opt_grpjquota
, "grpjquota=%s"},
1221 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1222 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1223 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1224 {Opt_grpquota
, "grpquota"},
1225 {Opt_noquota
, "noquota"},
1226 {Opt_quota
, "quota"},
1227 {Opt_usrquota
, "usrquota"},
1228 {Opt_barrier
, "barrier=%u"},
1229 {Opt_barrier
, "barrier"},
1230 {Opt_nobarrier
, "nobarrier"},
1231 {Opt_i_version
, "i_version"},
1232 {Opt_stripe
, "stripe=%u"},
1233 {Opt_delalloc
, "delalloc"},
1234 {Opt_nodelalloc
, "nodelalloc"},
1235 {Opt_mblk_io_submit
, "mblk_io_submit"},
1236 {Opt_nomblk_io_submit
, "nomblk_io_submit"},
1237 {Opt_block_validity
, "block_validity"},
1238 {Opt_noblock_validity
, "noblock_validity"},
1239 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1240 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1241 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1242 {Opt_auto_da_alloc
, "auto_da_alloc"},
1243 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1244 {Opt_dioread_nolock
, "dioread_nolock"},
1245 {Opt_dioread_lock
, "dioread_lock"},
1246 {Opt_discard
, "discard"},
1247 {Opt_nodiscard
, "nodiscard"},
1248 {Opt_init_itable
, "init_itable=%u"},
1249 {Opt_init_itable
, "init_itable"},
1250 {Opt_noinit_itable
, "noinit_itable"},
1254 static ext4_fsblk_t
get_sb_block(void **data
)
1256 ext4_fsblk_t sb_block
;
1257 char *options
= (char *) *data
;
1259 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1260 return 1; /* Default location */
1263 /* TODO: use simple_strtoll with >32bit ext4 */
1264 sb_block
= simple_strtoul(options
, &options
, 0);
1265 if (*options
&& *options
!= ',') {
1266 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1270 if (*options
== ',')
1272 *data
= (void *) options
;
1277 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1278 static char deprecated_msg
[] = "Mount option \"%s\" will be removed by %s\n"
1279 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1282 static int set_qf_name(struct super_block
*sb
, int qtype
, substring_t
*args
)
1284 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1287 if (sb_any_quota_loaded(sb
) &&
1288 !sbi
->s_qf_names
[qtype
]) {
1289 ext4_msg(sb
, KERN_ERR
,
1290 "Cannot change journaled "
1291 "quota options when quota turned on");
1294 qname
= match_strdup(args
);
1296 ext4_msg(sb
, KERN_ERR
,
1297 "Not enough memory for storing quotafile name");
1300 if (sbi
->s_qf_names
[qtype
] &&
1301 strcmp(sbi
->s_qf_names
[qtype
], qname
)) {
1302 ext4_msg(sb
, KERN_ERR
,
1303 "%s quota file already specified", QTYPE2NAME(qtype
));
1307 sbi
->s_qf_names
[qtype
] = qname
;
1308 if (strchr(sbi
->s_qf_names
[qtype
], '/')) {
1309 ext4_msg(sb
, KERN_ERR
,
1310 "quotafile must be on filesystem root");
1311 kfree(sbi
->s_qf_names
[qtype
]);
1312 sbi
->s_qf_names
[qtype
] = NULL
;
1319 static int clear_qf_name(struct super_block
*sb
, int qtype
)
1322 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1324 if (sb_any_quota_loaded(sb
) &&
1325 sbi
->s_qf_names
[qtype
]) {
1326 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled quota options"
1327 " when quota turned on");
1331 * The space will be released later when all options are confirmed
1334 sbi
->s_qf_names
[qtype
] = NULL
;
1339 #define MOPT_SET 0x0001
1340 #define MOPT_CLEAR 0x0002
1341 #define MOPT_NOSUPPORT 0x0004
1342 #define MOPT_EXPLICIT 0x0008
1343 #define MOPT_CLEAR_ERR 0x0010
1344 #define MOPT_GTE0 0x0020
1347 #define MOPT_QFMT 0x0040
1349 #define MOPT_Q MOPT_NOSUPPORT
1350 #define MOPT_QFMT MOPT_NOSUPPORT
1352 #define MOPT_DATAJ 0x0080
1354 static const struct mount_opts
{
1358 } ext4_mount_opts
[] = {
1359 {Opt_minix_df
, EXT4_MOUNT_MINIX_DF
, MOPT_SET
},
1360 {Opt_bsd_df
, EXT4_MOUNT_MINIX_DF
, MOPT_CLEAR
},
1361 {Opt_grpid
, EXT4_MOUNT_GRPID
, MOPT_SET
},
1362 {Opt_nogrpid
, EXT4_MOUNT_GRPID
, MOPT_CLEAR
},
1363 {Opt_mblk_io_submit
, EXT4_MOUNT_MBLK_IO_SUBMIT
, MOPT_SET
},
1364 {Opt_nomblk_io_submit
, EXT4_MOUNT_MBLK_IO_SUBMIT
, MOPT_CLEAR
},
1365 {Opt_block_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_SET
},
1366 {Opt_noblock_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_CLEAR
},
1367 {Opt_dioread_nolock
, EXT4_MOUNT_DIOREAD_NOLOCK
, MOPT_SET
},
1368 {Opt_dioread_lock
, EXT4_MOUNT_DIOREAD_NOLOCK
, MOPT_CLEAR
},
1369 {Opt_discard
, EXT4_MOUNT_DISCARD
, MOPT_SET
},
1370 {Opt_nodiscard
, EXT4_MOUNT_DISCARD
, MOPT_CLEAR
},
1371 {Opt_delalloc
, EXT4_MOUNT_DELALLOC
, MOPT_SET
| MOPT_EXPLICIT
},
1372 {Opt_nodelalloc
, EXT4_MOUNT_DELALLOC
, MOPT_CLEAR
| MOPT_EXPLICIT
},
1373 {Opt_journal_checksum
, EXT4_MOUNT_JOURNAL_CHECKSUM
, MOPT_SET
},
1374 {Opt_journal_async_commit
, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT
|
1375 EXT4_MOUNT_JOURNAL_CHECKSUM
), MOPT_SET
},
1376 {Opt_noload
, EXT4_MOUNT_NOLOAD
, MOPT_SET
},
1377 {Opt_err_panic
, EXT4_MOUNT_ERRORS_PANIC
, MOPT_SET
| MOPT_CLEAR_ERR
},
1378 {Opt_err_ro
, EXT4_MOUNT_ERRORS_RO
, MOPT_SET
| MOPT_CLEAR_ERR
},
1379 {Opt_err_cont
, EXT4_MOUNT_ERRORS_CONT
, MOPT_SET
| MOPT_CLEAR_ERR
},
1380 {Opt_data_err_abort
, EXT4_MOUNT_DATA_ERR_ABORT
, MOPT_SET
},
1381 {Opt_data_err_ignore
, EXT4_MOUNT_DATA_ERR_ABORT
, MOPT_CLEAR
},
1382 {Opt_barrier
, EXT4_MOUNT_BARRIER
, MOPT_SET
},
1383 {Opt_nobarrier
, EXT4_MOUNT_BARRIER
, MOPT_CLEAR
},
1384 {Opt_noauto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_SET
},
1385 {Opt_auto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_CLEAR
},
1386 {Opt_noinit_itable
, EXT4_MOUNT_INIT_INODE_TABLE
, MOPT_CLEAR
},
1387 {Opt_commit
, 0, MOPT_GTE0
},
1388 {Opt_max_batch_time
, 0, MOPT_GTE0
},
1389 {Opt_min_batch_time
, 0, MOPT_GTE0
},
1390 {Opt_inode_readahead_blks
, 0, MOPT_GTE0
},
1391 {Opt_init_itable
, 0, MOPT_GTE0
},
1392 {Opt_stripe
, 0, MOPT_GTE0
},
1393 {Opt_data_journal
, EXT4_MOUNT_JOURNAL_DATA
, MOPT_DATAJ
},
1394 {Opt_data_ordered
, EXT4_MOUNT_ORDERED_DATA
, MOPT_DATAJ
},
1395 {Opt_data_writeback
, EXT4_MOUNT_WRITEBACK_DATA
, MOPT_DATAJ
},
1396 #ifdef CONFIG_EXT4_FS_XATTR
1397 {Opt_user_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_SET
},
1398 {Opt_nouser_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_CLEAR
},
1400 {Opt_user_xattr
, 0, MOPT_NOSUPPORT
},
1401 {Opt_nouser_xattr
, 0, MOPT_NOSUPPORT
},
1403 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1404 {Opt_acl
, EXT4_MOUNT_POSIX_ACL
, MOPT_SET
},
1405 {Opt_noacl
, EXT4_MOUNT_POSIX_ACL
, MOPT_CLEAR
},
1407 {Opt_acl
, 0, MOPT_NOSUPPORT
},
1408 {Opt_noacl
, 0, MOPT_NOSUPPORT
},
1410 {Opt_nouid32
, EXT4_MOUNT_NO_UID32
, MOPT_SET
},
1411 {Opt_debug
, EXT4_MOUNT_DEBUG
, MOPT_SET
},
1412 {Opt_quota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
, MOPT_SET
| MOPT_Q
},
1413 {Opt_usrquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
,
1415 {Opt_grpquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_GRPQUOTA
,
1417 {Opt_noquota
, (EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
|
1418 EXT4_MOUNT_GRPQUOTA
), MOPT_CLEAR
| MOPT_Q
},
1419 {Opt_usrjquota
, 0, MOPT_Q
},
1420 {Opt_grpjquota
, 0, MOPT_Q
},
1421 {Opt_offusrjquota
, 0, MOPT_Q
},
1422 {Opt_offgrpjquota
, 0, MOPT_Q
},
1423 {Opt_jqfmt_vfsold
, QFMT_VFS_OLD
, MOPT_QFMT
},
1424 {Opt_jqfmt_vfsv0
, QFMT_VFS_V0
, MOPT_QFMT
},
1425 {Opt_jqfmt_vfsv1
, QFMT_VFS_V1
, MOPT_QFMT
},
1429 static int handle_mount_opt(struct super_block
*sb
, char *opt
, int token
,
1430 substring_t
*args
, unsigned long *journal_devnum
,
1431 unsigned int *journal_ioprio
, int is_remount
)
1433 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1434 const struct mount_opts
*m
;
1437 if (args
->from
&& match_int(args
, &arg
))
1441 return 1; /* handled by get_sb_block() */
1443 ext4_msg(sb
, KERN_WARNING
,
1444 "Ignoring removed %s option", opt
);
1447 sbi
->s_resuid
= arg
;
1450 sbi
->s_resgid
= arg
;
1453 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1456 sb
->s_flags
|= MS_I_VERSION
;
1458 case Opt_journal_dev
:
1460 ext4_msg(sb
, KERN_ERR
,
1461 "Cannot specify journal on remount");
1464 *journal_devnum
= arg
;
1466 case Opt_journal_ioprio
:
1467 if (arg
< 0 || arg
> 7)
1469 *journal_ioprio
= IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
, arg
);
1473 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++) {
1474 if (token
!= m
->token
)
1476 if (args
->from
&& (m
->flags
& MOPT_GTE0
) && (arg
< 0))
1478 if (m
->flags
& MOPT_EXPLICIT
)
1479 set_opt2(sb
, EXPLICIT_DELALLOC
);
1480 if (m
->flags
& MOPT_CLEAR_ERR
)
1481 clear_opt(sb
, ERRORS_MASK
);
1482 if (token
== Opt_noquota
&& sb_any_quota_loaded(sb
)) {
1483 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1484 "options when quota turned on");
1488 if (m
->flags
& MOPT_NOSUPPORT
) {
1489 ext4_msg(sb
, KERN_ERR
, "%s option not supported", opt
);
1490 } else if (token
== Opt_commit
) {
1492 arg
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1493 sbi
->s_commit_interval
= HZ
* arg
;
1494 } else if (token
== Opt_max_batch_time
) {
1496 arg
= EXT4_DEF_MAX_BATCH_TIME
;
1497 sbi
->s_max_batch_time
= arg
;
1498 } else if (token
== Opt_min_batch_time
) {
1499 sbi
->s_min_batch_time
= arg
;
1500 } else if (token
== Opt_inode_readahead_blks
) {
1501 if (arg
> (1 << 30))
1503 if (arg
&& !is_power_of_2(arg
)) {
1504 ext4_msg(sb
, KERN_ERR
,
1505 "EXT4-fs: inode_readahead_blks"
1506 " must be a power of 2");
1509 sbi
->s_inode_readahead_blks
= arg
;
1510 } else if (token
== Opt_init_itable
) {
1511 set_opt(sb
, INIT_INODE_TABLE
);
1513 arg
= EXT4_DEF_LI_WAIT_MULT
;
1514 sbi
->s_li_wait_mult
= arg
;
1515 } else if (token
== Opt_stripe
) {
1516 sbi
->s_stripe
= arg
;
1517 } else if (m
->flags
& MOPT_DATAJ
) {
1519 if (!sbi
->s_journal
)
1520 ext4_msg(sb
, KERN_WARNING
, "Remounting file system with no journal so ignoring journalled data option");
1521 else if (test_opt(sb
, DATA_FLAGS
) !=
1523 ext4_msg(sb
, KERN_ERR
,
1524 "Cannot change data mode on remount");
1528 clear_opt(sb
, DATA_FLAGS
);
1529 sbi
->s_mount_opt
|= m
->mount_opt
;
1532 } else if (token
== Opt_usrjquota
) {
1533 if (!set_qf_name(sb
, USRQUOTA
, &args
[0]))
1535 } else if (token
== Opt_grpjquota
) {
1536 if (!set_qf_name(sb
, GRPQUOTA
, &args
[0]))
1538 } else if (token
== Opt_offusrjquota
) {
1539 if (!clear_qf_name(sb
, USRQUOTA
))
1541 } else if (token
== Opt_offgrpjquota
) {
1542 if (!clear_qf_name(sb
, GRPQUOTA
))
1544 } else if (m
->flags
& MOPT_QFMT
) {
1545 if (sb_any_quota_loaded(sb
) &&
1546 sbi
->s_jquota_fmt
!= m
->mount_opt
) {
1547 ext4_msg(sb
, KERN_ERR
, "Cannot "
1548 "change journaled quota options "
1549 "when quota turned on");
1552 sbi
->s_jquota_fmt
= m
->mount_opt
;
1557 if (m
->flags
& MOPT_CLEAR
)
1559 else if (unlikely(!(m
->flags
& MOPT_SET
))) {
1560 ext4_msg(sb
, KERN_WARNING
,
1561 "buggy handling of option %s", opt
);
1566 sbi
->s_mount_opt
|= m
->mount_opt
;
1568 sbi
->s_mount_opt
&= ~m
->mount_opt
;
1572 ext4_msg(sb
, KERN_ERR
, "Unrecognized mount option \"%s\" "
1573 "or missing value", opt
);
1577 static int parse_options(char *options
, struct super_block
*sb
,
1578 unsigned long *journal_devnum
,
1579 unsigned int *journal_ioprio
,
1582 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1584 substring_t args
[MAX_OPT_ARGS
];
1590 while ((p
= strsep(&options
, ",")) != NULL
) {
1594 * Initialize args struct so we know whether arg was
1595 * found; some options take optional arguments.
1597 args
[0].to
= args
[0].from
= 0;
1598 token
= match_token(p
, tokens
, args
);
1599 if (handle_mount_opt(sb
, p
, token
, args
, journal_devnum
,
1600 journal_ioprio
, is_remount
) < 0)
1604 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1605 if (test_opt(sb
, USRQUOTA
) && sbi
->s_qf_names
[USRQUOTA
])
1606 clear_opt(sb
, USRQUOTA
);
1608 if (test_opt(sb
, GRPQUOTA
) && sbi
->s_qf_names
[GRPQUOTA
])
1609 clear_opt(sb
, GRPQUOTA
);
1611 if (test_opt(sb
, GRPQUOTA
) || test_opt(sb
, USRQUOTA
)) {
1612 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1617 if (!sbi
->s_jquota_fmt
) {
1618 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1623 if (sbi
->s_jquota_fmt
) {
1624 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1625 "specified with no journaling "
1634 static inline void ext4_show_quota_options(struct seq_file
*seq
,
1635 struct super_block
*sb
)
1637 #if defined(CONFIG_QUOTA)
1638 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1640 if (sbi
->s_jquota_fmt
) {
1643 switch (sbi
->s_jquota_fmt
) {
1654 seq_printf(seq
, ",jqfmt=%s", fmtname
);
1657 if (sbi
->s_qf_names
[USRQUOTA
])
1658 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
1660 if (sbi
->s_qf_names
[GRPQUOTA
])
1661 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
1663 if (test_opt(sb
, USRQUOTA
))
1664 seq_puts(seq
, ",usrquota");
1666 if (test_opt(sb
, GRPQUOTA
))
1667 seq_puts(seq
, ",grpquota");
1671 static const char *token2str(int token
)
1673 static const struct match_token
*t
;
1675 for (t
= tokens
; t
->token
!= Opt_err
; t
++)
1676 if (t
->token
== token
&& !strchr(t
->pattern
, '='))
1683 * - it's set to a non-default value OR
1684 * - if the per-sb default is different from the global default
1686 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
)
1689 struct super_block
*sb
= root
->d_sb
;
1690 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1691 struct ext4_super_block
*es
= sbi
->s_es
;
1692 const struct mount_opts
*m
;
1694 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "," str)
1695 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "," str, arg)
1697 if (sbi
->s_sb_block
!= 1)
1698 SEQ_OPTS_PRINT("sb=%llu", sbi
->s_sb_block
);
1700 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++) {
1701 int want_set
= m
->flags
& MOPT_SET
;
1702 if (((m
->flags
& (MOPT_SET
|MOPT_CLEAR
)) == 0) ||
1703 (m
->flags
& MOPT_CLEAR_ERR
))
1705 if (!(m
->mount_opt
& (sbi
->s_mount_opt
^ sbi
->s_def_mount_opt
)))
1706 continue; /* skip if same as the default */
1708 (sbi
->s_mount_opt
& m
->mount_opt
) != m
->mount_opt
) ||
1709 (!want_set
&& (sbi
->s_mount_opt
& m
->mount_opt
)))
1710 continue; /* select Opt_noFoo vs Opt_Foo */
1711 SEQ_OPTS_PRINT("%s", token2str(m
->token
));
1714 if (sbi
->s_resuid
!= EXT4_DEF_RESUID
||
1715 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
)
1716 SEQ_OPTS_PRINT("resuid=%u", sbi
->s_resuid
);
1717 if (sbi
->s_resgid
!= EXT4_DEF_RESGID
||
1718 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
)
1719 SEQ_OPTS_PRINT("resgid=%u", sbi
->s_resgid
);
1720 def_errors
= le16_to_cpu(es
->s_errors
);
1721 if (test_opt(sb
, ERRORS_RO
) && def_errors
!= EXT4_ERRORS_RO
)
1722 SEQ_OPTS_PUTS("errors=remount-ro");
1723 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
1724 SEQ_OPTS_PUTS("errors=continue");
1725 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
1726 SEQ_OPTS_PUTS("errors=panic");
1727 if (sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
)
1728 SEQ_OPTS_PRINT("commit=%lu", sbi
->s_commit_interval
/ HZ
);
1729 if (sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
)
1730 SEQ_OPTS_PRINT("min_batch_time=%u", sbi
->s_min_batch_time
);
1731 if (sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
)
1732 SEQ_OPTS_PRINT("max_batch_time=%u", sbi
->s_max_batch_time
);
1733 if (sb
->s_flags
& MS_I_VERSION
)
1734 SEQ_OPTS_PUTS("i_version");
1736 SEQ_OPTS_PRINT("stripe=%lu", sbi
->s_stripe
);
1737 if (EXT4_MOUNT_DATA_FLAGS
& (sbi
->s_mount_opt
^ sbi
->s_def_mount_opt
)) {
1738 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
1739 SEQ_OPTS_PUTS("data=journal");
1740 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
1741 SEQ_OPTS_PUTS("data=ordered");
1742 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
1743 SEQ_OPTS_PUTS("data=writeback");
1745 if (sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
1746 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1747 sbi
->s_inode_readahead_blks
);
1749 if (test_opt(sb
, INIT_INODE_TABLE
) &&
1750 (sbi
->s_li_wait_mult
!= EXT4_DEF_LI_WAIT_MULT
))
1751 SEQ_OPTS_PRINT("init_itable=%u", sbi
->s_li_wait_mult
);
1753 ext4_show_quota_options(seq
, sb
);
1757 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1760 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1763 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1764 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
1765 "forcing read-only mode");
1770 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1771 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
1772 "running e2fsck is recommended");
1773 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1774 ext4_msg(sb
, KERN_WARNING
,
1775 "warning: mounting fs with errors, "
1776 "running e2fsck is recommended");
1777 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) > 0 &&
1778 le16_to_cpu(es
->s_mnt_count
) >=
1779 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1780 ext4_msg(sb
, KERN_WARNING
,
1781 "warning: maximal mount count reached, "
1782 "running e2fsck is recommended");
1783 else if (le32_to_cpu(es
->s_checkinterval
) &&
1784 (le32_to_cpu(es
->s_lastcheck
) +
1785 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1786 ext4_msg(sb
, KERN_WARNING
,
1787 "warning: checktime reached, "
1788 "running e2fsck is recommended");
1789 if (!sbi
->s_journal
)
1790 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1791 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1792 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1793 le16_add_cpu(&es
->s_mnt_count
, 1);
1794 es
->s_mtime
= cpu_to_le32(get_seconds());
1795 ext4_update_dynamic_rev(sb
);
1797 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1799 ext4_commit_super(sb
, 1);
1801 if (test_opt(sb
, DEBUG
))
1802 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
1803 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1805 sbi
->s_groups_count
,
1806 EXT4_BLOCKS_PER_GROUP(sb
),
1807 EXT4_INODES_PER_GROUP(sb
),
1808 sbi
->s_mount_opt
, sbi
->s_mount_opt2
);
1810 cleancache_init_fs(sb
);
1814 static int ext4_fill_flex_info(struct super_block
*sb
)
1816 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1817 struct ext4_group_desc
*gdp
= NULL
;
1818 ext4_group_t flex_group_count
;
1819 ext4_group_t flex_group
;
1820 unsigned int groups_per_flex
= 0;
1824 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1825 if (sbi
->s_log_groups_per_flex
< 1 || sbi
->s_log_groups_per_flex
> 31) {
1826 sbi
->s_log_groups_per_flex
= 0;
1829 groups_per_flex
= 1 << sbi
->s_log_groups_per_flex
;
1831 /* We allocate both existing and potentially added groups */
1832 flex_group_count
= ((sbi
->s_groups_count
+ groups_per_flex
- 1) +
1833 ((le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
) + 1) <<
1834 EXT4_DESC_PER_BLOCK_BITS(sb
))) / groups_per_flex
;
1835 size
= flex_group_count
* sizeof(struct flex_groups
);
1836 sbi
->s_flex_groups
= ext4_kvzalloc(size
, GFP_KERNEL
);
1837 if (sbi
->s_flex_groups
== NULL
) {
1838 ext4_msg(sb
, KERN_ERR
, "not enough memory for %u flex groups",
1843 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1844 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1846 flex_group
= ext4_flex_group(sbi
, i
);
1847 atomic_add(ext4_free_inodes_count(sb
, gdp
),
1848 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
1849 atomic_add(ext4_free_group_clusters(sb
, gdp
),
1850 &sbi
->s_flex_groups
[flex_group
].free_clusters
);
1851 atomic_add(ext4_used_dirs_count(sb
, gdp
),
1852 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
1860 __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
1861 struct ext4_group_desc
*gdp
)
1865 if (sbi
->s_es
->s_feature_ro_compat
&
1866 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) {
1867 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
1868 __le32 le_group
= cpu_to_le32(block_group
);
1870 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
1871 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
1872 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
1873 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
1874 /* for checksum of struct ext4_group_desc do the rest...*/
1875 if ((sbi
->s_es
->s_feature_incompat
&
1876 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
1877 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
1878 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
1879 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
1883 return cpu_to_le16(crc
);
1886 int ext4_group_desc_csum_verify(struct ext4_sb_info
*sbi
, __u32 block_group
,
1887 struct ext4_group_desc
*gdp
)
1889 if ((sbi
->s_es
->s_feature_ro_compat
&
1890 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM
)) &&
1891 (gdp
->bg_checksum
!= ext4_group_desc_csum(sbi
, block_group
, gdp
)))
1897 /* Called at mount-time, super-block is locked */
1898 static int ext4_check_descriptors(struct super_block
*sb
,
1899 ext4_group_t
*first_not_zeroed
)
1901 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1902 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
1903 ext4_fsblk_t last_block
;
1904 ext4_fsblk_t block_bitmap
;
1905 ext4_fsblk_t inode_bitmap
;
1906 ext4_fsblk_t inode_table
;
1907 int flexbg_flag
= 0;
1908 ext4_group_t i
, grp
= sbi
->s_groups_count
;
1910 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
1913 ext4_debug("Checking group descriptors");
1915 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1916 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1918 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
1919 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
1921 last_block
= first_block
+
1922 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
1924 if ((grp
== sbi
->s_groups_count
) &&
1925 !(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
1928 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
1929 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
1930 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1931 "Block bitmap for group %u not in group "
1932 "(block %llu)!", i
, block_bitmap
);
1935 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
1936 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
1937 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1938 "Inode bitmap for group %u not in group "
1939 "(block %llu)!", i
, inode_bitmap
);
1942 inode_table
= ext4_inode_table(sb
, gdp
);
1943 if (inode_table
< first_block
||
1944 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
1945 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1946 "Inode table for group %u not in group "
1947 "(block %llu)!", i
, inode_table
);
1950 ext4_lock_group(sb
, i
);
1951 if (!ext4_group_desc_csum_verify(sbi
, i
, gdp
)) {
1952 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
1953 "Checksum for group %u failed (%u!=%u)",
1954 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
1955 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
1956 if (!(sb
->s_flags
& MS_RDONLY
)) {
1957 ext4_unlock_group(sb
, i
);
1961 ext4_unlock_group(sb
, i
);
1963 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
1965 if (NULL
!= first_not_zeroed
)
1966 *first_not_zeroed
= grp
;
1968 ext4_free_blocks_count_set(sbi
->s_es
,
1969 EXT4_C2B(sbi
, ext4_count_free_clusters(sb
)));
1970 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
1974 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1975 * the superblock) which were deleted from all directories, but held open by
1976 * a process at the time of a crash. We walk the list and try to delete these
1977 * inodes at recovery time (only with a read-write filesystem).
1979 * In order to keep the orphan inode chain consistent during traversal (in
1980 * case of crash during recovery), we link each inode into the superblock
1981 * orphan list_head and handle it the same way as an inode deletion during
1982 * normal operation (which journals the operations for us).
1984 * We only do an iget() and an iput() on each inode, which is very safe if we
1985 * accidentally point at an in-use or already deleted inode. The worst that
1986 * can happen in this case is that we get a "bit already cleared" message from
1987 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1988 * e2fsck was run on this filesystem, and it must have already done the orphan
1989 * inode cleanup for us, so we can safely abort without any further action.
1991 static void ext4_orphan_cleanup(struct super_block
*sb
,
1992 struct ext4_super_block
*es
)
1994 unsigned int s_flags
= sb
->s_flags
;
1995 int nr_orphans
= 0, nr_truncates
= 0;
1999 if (!es
->s_last_orphan
) {
2000 jbd_debug(4, "no orphan inodes to clean up\n");
2004 if (bdev_read_only(sb
->s_bdev
)) {
2005 ext4_msg(sb
, KERN_ERR
, "write access "
2006 "unavailable, skipping orphan cleanup");
2010 /* Check if feature set would not allow a r/w mount */
2011 if (!ext4_feature_set_ok(sb
, 0)) {
2012 ext4_msg(sb
, KERN_INFO
, "Skipping orphan cleanup due to "
2013 "unknown ROCOMPAT features");
2017 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2018 if (es
->s_last_orphan
)
2019 jbd_debug(1, "Errors on filesystem, "
2020 "clearing orphan list.\n");
2021 es
->s_last_orphan
= 0;
2022 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2026 if (s_flags
& MS_RDONLY
) {
2027 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
2028 sb
->s_flags
&= ~MS_RDONLY
;
2031 /* Needed for iput() to work correctly and not trash data */
2032 sb
->s_flags
|= MS_ACTIVE
;
2033 /* Turn on quotas so that they are updated correctly */
2034 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2035 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
2036 int ret
= ext4_quota_on_mount(sb
, i
);
2038 ext4_msg(sb
, KERN_ERR
,
2039 "Cannot turn on journaled "
2040 "quota: error %d", ret
);
2045 while (es
->s_last_orphan
) {
2046 struct inode
*inode
;
2048 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
2049 if (IS_ERR(inode
)) {
2050 es
->s_last_orphan
= 0;
2054 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
2055 dquot_initialize(inode
);
2056 if (inode
->i_nlink
) {
2057 ext4_msg(sb
, KERN_DEBUG
,
2058 "%s: truncating inode %lu to %lld bytes",
2059 __func__
, inode
->i_ino
, inode
->i_size
);
2060 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2061 inode
->i_ino
, inode
->i_size
);
2062 ext4_truncate(inode
);
2065 ext4_msg(sb
, KERN_DEBUG
,
2066 "%s: deleting unreferenced inode %lu",
2067 __func__
, inode
->i_ino
);
2068 jbd_debug(2, "deleting unreferenced inode %lu\n",
2072 iput(inode
); /* The delete magic happens here! */
2075 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2078 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
2079 PLURAL(nr_orphans
));
2081 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
2082 PLURAL(nr_truncates
));
2084 /* Turn quotas off */
2085 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2086 if (sb_dqopt(sb
)->files
[i
])
2087 dquot_quota_off(sb
, i
);
2090 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
2094 * Maximal extent format file size.
2095 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2096 * extent format containers, within a sector_t, and within i_blocks
2097 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2098 * so that won't be a limiting factor.
2100 * However there is other limiting factor. We do store extents in the form
2101 * of starting block and length, hence the resulting length of the extent
2102 * covering maximum file size must fit into on-disk format containers as
2103 * well. Given that length is always by 1 unit bigger than max unit (because
2104 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2106 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2108 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
2111 loff_t upper_limit
= MAX_LFS_FILESIZE
;
2113 /* small i_blocks in vfs inode? */
2114 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2116 * CONFIG_LBDAF is not enabled implies the inode
2117 * i_block represent total blocks in 512 bytes
2118 * 32 == size of vfs inode i_blocks * 8
2120 upper_limit
= (1LL << 32) - 1;
2122 /* total blocks in file system block size */
2123 upper_limit
>>= (blkbits
- 9);
2124 upper_limit
<<= blkbits
;
2128 * 32-bit extent-start container, ee_block. We lower the maxbytes
2129 * by one fs block, so ee_len can cover the extent of maximum file
2132 res
= (1LL << 32) - 1;
2135 /* Sanity check against vm- & vfs- imposed limits */
2136 if (res
> upper_limit
)
2143 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2144 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2145 * We need to be 1 filesystem block less than the 2^48 sector limit.
2147 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2149 loff_t res
= EXT4_NDIR_BLOCKS
;
2152 /* This is calculated to be the largest file size for a dense, block
2153 * mapped file such that the file's total number of 512-byte sectors,
2154 * including data and all indirect blocks, does not exceed (2^48 - 1).
2156 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2157 * number of 512-byte sectors of the file.
2160 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2162 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2163 * the inode i_block field represents total file blocks in
2164 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2166 upper_limit
= (1LL << 32) - 1;
2168 /* total blocks in file system block size */
2169 upper_limit
>>= (bits
- 9);
2173 * We use 48 bit ext4_inode i_blocks
2174 * With EXT4_HUGE_FILE_FL set the i_blocks
2175 * represent total number of blocks in
2176 * file system block size
2178 upper_limit
= (1LL << 48) - 1;
2182 /* indirect blocks */
2184 /* double indirect blocks */
2185 meta_blocks
+= 1 + (1LL << (bits
-2));
2186 /* tripple indirect blocks */
2187 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2189 upper_limit
-= meta_blocks
;
2190 upper_limit
<<= bits
;
2192 res
+= 1LL << (bits
-2);
2193 res
+= 1LL << (2*(bits
-2));
2194 res
+= 1LL << (3*(bits
-2));
2196 if (res
> upper_limit
)
2199 if (res
> MAX_LFS_FILESIZE
)
2200 res
= MAX_LFS_FILESIZE
;
2205 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2206 ext4_fsblk_t logical_sb_block
, int nr
)
2208 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2209 ext4_group_t bg
, first_meta_bg
;
2212 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2214 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
2216 return logical_sb_block
+ nr
+ 1;
2217 bg
= sbi
->s_desc_per_block
* nr
;
2218 if (ext4_bg_has_super(sb
, bg
))
2221 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2225 * ext4_get_stripe_size: Get the stripe size.
2226 * @sbi: In memory super block info
2228 * If we have specified it via mount option, then
2229 * use the mount option value. If the value specified at mount time is
2230 * greater than the blocks per group use the super block value.
2231 * If the super block value is greater than blocks per group return 0.
2232 * Allocator needs it be less than blocks per group.
2235 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2237 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2238 unsigned long stripe_width
=
2239 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2242 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2243 ret
= sbi
->s_stripe
;
2244 else if (stripe_width
<= sbi
->s_blocks_per_group
)
2246 else if (stride
<= sbi
->s_blocks_per_group
)
2252 * If the stripe width is 1, this makes no sense and
2253 * we set it to 0 to turn off stripe handling code.
2264 struct attribute attr
;
2265 ssize_t (*show
)(struct ext4_attr
*, struct ext4_sb_info
*, char *);
2266 ssize_t (*store
)(struct ext4_attr
*, struct ext4_sb_info
*,
2267 const char *, size_t);
2271 static int parse_strtoul(const char *buf
,
2272 unsigned long max
, unsigned long *value
)
2276 *value
= simple_strtoul(skip_spaces(buf
), &endp
, 0);
2277 endp
= skip_spaces(endp
);
2278 if (*endp
|| *value
> max
)
2284 static ssize_t
delayed_allocation_blocks_show(struct ext4_attr
*a
,
2285 struct ext4_sb_info
*sbi
,
2288 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2290 percpu_counter_sum(&sbi
->s_dirtyclusters_counter
)));
2293 static ssize_t
session_write_kbytes_show(struct ext4_attr
*a
,
2294 struct ext4_sb_info
*sbi
, char *buf
)
2296 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2298 if (!sb
->s_bdev
->bd_part
)
2299 return snprintf(buf
, PAGE_SIZE
, "0\n");
2300 return snprintf(buf
, PAGE_SIZE
, "%lu\n",
2301 (part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2302 sbi
->s_sectors_written_start
) >> 1);
2305 static ssize_t
lifetime_write_kbytes_show(struct ext4_attr
*a
,
2306 struct ext4_sb_info
*sbi
, char *buf
)
2308 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2310 if (!sb
->s_bdev
->bd_part
)
2311 return snprintf(buf
, PAGE_SIZE
, "0\n");
2312 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2313 (unsigned long long)(sbi
->s_kbytes_written
+
2314 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2315 EXT4_SB(sb
)->s_sectors_written_start
) >> 1)));
2318 static ssize_t
extent_cache_hits_show(struct ext4_attr
*a
,
2319 struct ext4_sb_info
*sbi
, char *buf
)
2321 return snprintf(buf
, PAGE_SIZE
, "%lu\n", sbi
->extent_cache_hits
);
2324 static ssize_t
extent_cache_misses_show(struct ext4_attr
*a
,
2325 struct ext4_sb_info
*sbi
, char *buf
)
2327 return snprintf(buf
, PAGE_SIZE
, "%lu\n", sbi
->extent_cache_misses
);
2330 static ssize_t
inode_readahead_blks_store(struct ext4_attr
*a
,
2331 struct ext4_sb_info
*sbi
,
2332 const char *buf
, size_t count
)
2336 if (parse_strtoul(buf
, 0x40000000, &t
))
2339 if (t
&& !is_power_of_2(t
))
2342 sbi
->s_inode_readahead_blks
= t
;
2346 static ssize_t
sbi_ui_show(struct ext4_attr
*a
,
2347 struct ext4_sb_info
*sbi
, char *buf
)
2349 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2351 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
2354 static ssize_t
sbi_ui_store(struct ext4_attr
*a
,
2355 struct ext4_sb_info
*sbi
,
2356 const char *buf
, size_t count
)
2358 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2361 if (parse_strtoul(buf
, 0xffffffff, &t
))
2367 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2368 static struct ext4_attr ext4_attr_##_name = { \
2369 .attr = {.name = __stringify(_name), .mode = _mode }, \
2372 .offset = offsetof(struct ext4_sb_info, _elname), \
2374 #define EXT4_ATTR(name, mode, show, store) \
2375 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2377 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2378 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2379 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2380 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2381 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2382 #define ATTR_LIST(name) &ext4_attr_##name.attr
2384 EXT4_RO_ATTR(delayed_allocation_blocks
);
2385 EXT4_RO_ATTR(session_write_kbytes
);
2386 EXT4_RO_ATTR(lifetime_write_kbytes
);
2387 EXT4_RO_ATTR(extent_cache_hits
);
2388 EXT4_RO_ATTR(extent_cache_misses
);
2389 EXT4_ATTR_OFFSET(inode_readahead_blks
, 0644, sbi_ui_show
,
2390 inode_readahead_blks_store
, s_inode_readahead_blks
);
2391 EXT4_RW_ATTR_SBI_UI(inode_goal
, s_inode_goal
);
2392 EXT4_RW_ATTR_SBI_UI(mb_stats
, s_mb_stats
);
2393 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan
, s_mb_max_to_scan
);
2394 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan
, s_mb_min_to_scan
);
2395 EXT4_RW_ATTR_SBI_UI(mb_order2_req
, s_mb_order2_reqs
);
2396 EXT4_RW_ATTR_SBI_UI(mb_stream_req
, s_mb_stream_request
);
2397 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc
, s_mb_group_prealloc
);
2398 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump
, s_max_writeback_mb_bump
);
2400 static struct attribute
*ext4_attrs
[] = {
2401 ATTR_LIST(delayed_allocation_blocks
),
2402 ATTR_LIST(session_write_kbytes
),
2403 ATTR_LIST(lifetime_write_kbytes
),
2404 ATTR_LIST(extent_cache_hits
),
2405 ATTR_LIST(extent_cache_misses
),
2406 ATTR_LIST(inode_readahead_blks
),
2407 ATTR_LIST(inode_goal
),
2408 ATTR_LIST(mb_stats
),
2409 ATTR_LIST(mb_max_to_scan
),
2410 ATTR_LIST(mb_min_to_scan
),
2411 ATTR_LIST(mb_order2_req
),
2412 ATTR_LIST(mb_stream_req
),
2413 ATTR_LIST(mb_group_prealloc
),
2414 ATTR_LIST(max_writeback_mb_bump
),
2418 /* Features this copy of ext4 supports */
2419 EXT4_INFO_ATTR(lazy_itable_init
);
2420 EXT4_INFO_ATTR(batched_discard
);
2422 static struct attribute
*ext4_feat_attrs
[] = {
2423 ATTR_LIST(lazy_itable_init
),
2424 ATTR_LIST(batched_discard
),
2428 static ssize_t
ext4_attr_show(struct kobject
*kobj
,
2429 struct attribute
*attr
, char *buf
)
2431 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2433 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2435 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
2438 static ssize_t
ext4_attr_store(struct kobject
*kobj
,
2439 struct attribute
*attr
,
2440 const char *buf
, size_t len
)
2442 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2444 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2446 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
2449 static void ext4_sb_release(struct kobject
*kobj
)
2451 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2453 complete(&sbi
->s_kobj_unregister
);
2456 static const struct sysfs_ops ext4_attr_ops
= {
2457 .show
= ext4_attr_show
,
2458 .store
= ext4_attr_store
,
2461 static struct kobj_type ext4_ktype
= {
2462 .default_attrs
= ext4_attrs
,
2463 .sysfs_ops
= &ext4_attr_ops
,
2464 .release
= ext4_sb_release
,
2467 static void ext4_feat_release(struct kobject
*kobj
)
2469 complete(&ext4_feat
->f_kobj_unregister
);
2472 static struct kobj_type ext4_feat_ktype
= {
2473 .default_attrs
= ext4_feat_attrs
,
2474 .sysfs_ops
= &ext4_attr_ops
,
2475 .release
= ext4_feat_release
,
2479 * Check whether this filesystem can be mounted based on
2480 * the features present and the RDONLY/RDWR mount requested.
2481 * Returns 1 if this filesystem can be mounted as requested,
2482 * 0 if it cannot be.
2484 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2486 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
)) {
2487 ext4_msg(sb
, KERN_ERR
,
2488 "Couldn't mount because of "
2489 "unsupported optional features (%x)",
2490 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2491 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2498 /* Check that feature set is OK for a read-write mount */
2499 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
)) {
2500 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2501 "unsupported optional features (%x)",
2502 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2503 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2507 * Large file size enabled file system can only be mounted
2508 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2510 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
2511 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2512 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2513 "cannot be mounted RDWR without "
2518 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_BIGALLOC
) &&
2519 !EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_EXTENTS
)) {
2520 ext4_msg(sb
, KERN_ERR
,
2521 "Can't support bigalloc feature without "
2522 "extents feature\n");
2529 * This function is called once a day if we have errors logged
2530 * on the file system
2532 static void print_daily_error_info(unsigned long arg
)
2534 struct super_block
*sb
= (struct super_block
*) arg
;
2535 struct ext4_sb_info
*sbi
;
2536 struct ext4_super_block
*es
;
2541 if (es
->s_error_count
)
2542 ext4_msg(sb
, KERN_NOTICE
, "error count: %u",
2543 le32_to_cpu(es
->s_error_count
));
2544 if (es
->s_first_error_time
) {
2545 printk(KERN_NOTICE
"EXT4-fs (%s): initial error at %u: %.*s:%d",
2546 sb
->s_id
, le32_to_cpu(es
->s_first_error_time
),
2547 (int) sizeof(es
->s_first_error_func
),
2548 es
->s_first_error_func
,
2549 le32_to_cpu(es
->s_first_error_line
));
2550 if (es
->s_first_error_ino
)
2551 printk(": inode %u",
2552 le32_to_cpu(es
->s_first_error_ino
));
2553 if (es
->s_first_error_block
)
2554 printk(": block %llu", (unsigned long long)
2555 le64_to_cpu(es
->s_first_error_block
));
2558 if (es
->s_last_error_time
) {
2559 printk(KERN_NOTICE
"EXT4-fs (%s): last error at %u: %.*s:%d",
2560 sb
->s_id
, le32_to_cpu(es
->s_last_error_time
),
2561 (int) sizeof(es
->s_last_error_func
),
2562 es
->s_last_error_func
,
2563 le32_to_cpu(es
->s_last_error_line
));
2564 if (es
->s_last_error_ino
)
2565 printk(": inode %u",
2566 le32_to_cpu(es
->s_last_error_ino
));
2567 if (es
->s_last_error_block
)
2568 printk(": block %llu", (unsigned long long)
2569 le64_to_cpu(es
->s_last_error_block
));
2572 mod_timer(&sbi
->s_err_report
, jiffies
+ 24*60*60*HZ
); /* Once a day */
2575 /* Find next suitable group and run ext4_init_inode_table */
2576 static int ext4_run_li_request(struct ext4_li_request
*elr
)
2578 struct ext4_group_desc
*gdp
= NULL
;
2579 ext4_group_t group
, ngroups
;
2580 struct super_block
*sb
;
2581 unsigned long timeout
= 0;
2585 ngroups
= EXT4_SB(sb
)->s_groups_count
;
2587 for (group
= elr
->lr_next_group
; group
< ngroups
; group
++) {
2588 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2594 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2598 if (group
== ngroups
)
2603 ret
= ext4_init_inode_table(sb
, group
,
2604 elr
->lr_timeout
? 0 : 1);
2605 if (elr
->lr_timeout
== 0) {
2606 timeout
= (jiffies
- timeout
) *
2607 elr
->lr_sbi
->s_li_wait_mult
;
2608 elr
->lr_timeout
= timeout
;
2610 elr
->lr_next_sched
= jiffies
+ elr
->lr_timeout
;
2611 elr
->lr_next_group
= group
+ 1;
2618 * Remove lr_request from the list_request and free the
2619 * request structure. Should be called with li_list_mtx held
2621 static void ext4_remove_li_request(struct ext4_li_request
*elr
)
2623 struct ext4_sb_info
*sbi
;
2630 list_del(&elr
->lr_request
);
2631 sbi
->s_li_request
= NULL
;
2635 static void ext4_unregister_li_request(struct super_block
*sb
)
2637 mutex_lock(&ext4_li_mtx
);
2638 if (!ext4_li_info
) {
2639 mutex_unlock(&ext4_li_mtx
);
2643 mutex_lock(&ext4_li_info
->li_list_mtx
);
2644 ext4_remove_li_request(EXT4_SB(sb
)->s_li_request
);
2645 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2646 mutex_unlock(&ext4_li_mtx
);
2649 static struct task_struct
*ext4_lazyinit_task
;
2652 * This is the function where ext4lazyinit thread lives. It walks
2653 * through the request list searching for next scheduled filesystem.
2654 * When such a fs is found, run the lazy initialization request
2655 * (ext4_rn_li_request) and keep track of the time spend in this
2656 * function. Based on that time we compute next schedule time of
2657 * the request. When walking through the list is complete, compute
2658 * next waking time and put itself into sleep.
2660 static int ext4_lazyinit_thread(void *arg
)
2662 struct ext4_lazy_init
*eli
= (struct ext4_lazy_init
*)arg
;
2663 struct list_head
*pos
, *n
;
2664 struct ext4_li_request
*elr
;
2665 unsigned long next_wakeup
, cur
;
2667 BUG_ON(NULL
== eli
);
2671 next_wakeup
= MAX_JIFFY_OFFSET
;
2673 mutex_lock(&eli
->li_list_mtx
);
2674 if (list_empty(&eli
->li_request_list
)) {
2675 mutex_unlock(&eli
->li_list_mtx
);
2679 list_for_each_safe(pos
, n
, &eli
->li_request_list
) {
2680 elr
= list_entry(pos
, struct ext4_li_request
,
2683 if (time_after_eq(jiffies
, elr
->lr_next_sched
)) {
2684 if (ext4_run_li_request(elr
) != 0) {
2685 /* error, remove the lazy_init job */
2686 ext4_remove_li_request(elr
);
2691 if (time_before(elr
->lr_next_sched
, next_wakeup
))
2692 next_wakeup
= elr
->lr_next_sched
;
2694 mutex_unlock(&eli
->li_list_mtx
);
2699 if ((time_after_eq(cur
, next_wakeup
)) ||
2700 (MAX_JIFFY_OFFSET
== next_wakeup
)) {
2705 schedule_timeout_interruptible(next_wakeup
- cur
);
2707 if (kthread_should_stop()) {
2708 ext4_clear_request_list();
2715 * It looks like the request list is empty, but we need
2716 * to check it under the li_list_mtx lock, to prevent any
2717 * additions into it, and of course we should lock ext4_li_mtx
2718 * to atomically free the list and ext4_li_info, because at
2719 * this point another ext4 filesystem could be registering
2722 mutex_lock(&ext4_li_mtx
);
2723 mutex_lock(&eli
->li_list_mtx
);
2724 if (!list_empty(&eli
->li_request_list
)) {
2725 mutex_unlock(&eli
->li_list_mtx
);
2726 mutex_unlock(&ext4_li_mtx
);
2729 mutex_unlock(&eli
->li_list_mtx
);
2730 kfree(ext4_li_info
);
2731 ext4_li_info
= NULL
;
2732 mutex_unlock(&ext4_li_mtx
);
2737 static void ext4_clear_request_list(void)
2739 struct list_head
*pos
, *n
;
2740 struct ext4_li_request
*elr
;
2742 mutex_lock(&ext4_li_info
->li_list_mtx
);
2743 list_for_each_safe(pos
, n
, &ext4_li_info
->li_request_list
) {
2744 elr
= list_entry(pos
, struct ext4_li_request
,
2746 ext4_remove_li_request(elr
);
2748 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2751 static int ext4_run_lazyinit_thread(void)
2753 ext4_lazyinit_task
= kthread_run(ext4_lazyinit_thread
,
2754 ext4_li_info
, "ext4lazyinit");
2755 if (IS_ERR(ext4_lazyinit_task
)) {
2756 int err
= PTR_ERR(ext4_lazyinit_task
);
2757 ext4_clear_request_list();
2758 kfree(ext4_li_info
);
2759 ext4_li_info
= NULL
;
2760 printk(KERN_CRIT
"EXT4: error %d creating inode table "
2761 "initialization thread\n",
2765 ext4_li_info
->li_state
|= EXT4_LAZYINIT_RUNNING
;
2770 * Check whether it make sense to run itable init. thread or not.
2771 * If there is at least one uninitialized inode table, return
2772 * corresponding group number, else the loop goes through all
2773 * groups and return total number of groups.
2775 static ext4_group_t
ext4_has_uninit_itable(struct super_block
*sb
)
2777 ext4_group_t group
, ngroups
= EXT4_SB(sb
)->s_groups_count
;
2778 struct ext4_group_desc
*gdp
= NULL
;
2780 for (group
= 0; group
< ngroups
; group
++) {
2781 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2785 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2792 static int ext4_li_info_new(void)
2794 struct ext4_lazy_init
*eli
= NULL
;
2796 eli
= kzalloc(sizeof(*eli
), GFP_KERNEL
);
2800 INIT_LIST_HEAD(&eli
->li_request_list
);
2801 mutex_init(&eli
->li_list_mtx
);
2803 eli
->li_state
|= EXT4_LAZYINIT_QUIT
;
2810 static struct ext4_li_request
*ext4_li_request_new(struct super_block
*sb
,
2813 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2814 struct ext4_li_request
*elr
;
2817 elr
= kzalloc(sizeof(*elr
), GFP_KERNEL
);
2823 elr
->lr_next_group
= start
;
2826 * Randomize first schedule time of the request to
2827 * spread the inode table initialization requests
2830 get_random_bytes(&rnd
, sizeof(rnd
));
2831 elr
->lr_next_sched
= jiffies
+ (unsigned long)rnd
%
2832 (EXT4_DEF_LI_MAX_START_DELAY
* HZ
);
2837 static int ext4_register_li_request(struct super_block
*sb
,
2838 ext4_group_t first_not_zeroed
)
2840 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2841 struct ext4_li_request
*elr
;
2842 ext4_group_t ngroups
= EXT4_SB(sb
)->s_groups_count
;
2845 if (sbi
->s_li_request
!= NULL
) {
2847 * Reset timeout so it can be computed again, because
2848 * s_li_wait_mult might have changed.
2850 sbi
->s_li_request
->lr_timeout
= 0;
2854 if (first_not_zeroed
== ngroups
||
2855 (sb
->s_flags
& MS_RDONLY
) ||
2856 !test_opt(sb
, INIT_INODE_TABLE
))
2859 elr
= ext4_li_request_new(sb
, first_not_zeroed
);
2863 mutex_lock(&ext4_li_mtx
);
2865 if (NULL
== ext4_li_info
) {
2866 ret
= ext4_li_info_new();
2871 mutex_lock(&ext4_li_info
->li_list_mtx
);
2872 list_add(&elr
->lr_request
, &ext4_li_info
->li_request_list
);
2873 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2875 sbi
->s_li_request
= elr
;
2877 * set elr to NULL here since it has been inserted to
2878 * the request_list and the removal and free of it is
2879 * handled by ext4_clear_request_list from now on.
2883 if (!(ext4_li_info
->li_state
& EXT4_LAZYINIT_RUNNING
)) {
2884 ret
= ext4_run_lazyinit_thread();
2889 mutex_unlock(&ext4_li_mtx
);
2896 * We do not need to lock anything since this is called on
2899 static void ext4_destroy_lazyinit_thread(void)
2902 * If thread exited earlier
2903 * there's nothing to be done.
2905 if (!ext4_li_info
|| !ext4_lazyinit_task
)
2908 kthread_stop(ext4_lazyinit_task
);
2911 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
2913 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
2914 struct buffer_head
*bh
;
2915 struct ext4_super_block
*es
= NULL
;
2916 struct ext4_sb_info
*sbi
;
2918 ext4_fsblk_t sb_block
= get_sb_block(&data
);
2919 ext4_fsblk_t logical_sb_block
;
2920 unsigned long offset
= 0;
2921 unsigned long journal_devnum
= 0;
2922 unsigned long def_mount_opts
;
2927 int blocksize
, clustersize
;
2928 unsigned int db_count
;
2930 int needs_recovery
, has_huge_files
, has_bigalloc
;
2933 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
2934 ext4_group_t first_not_zeroed
;
2936 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
2940 sbi
->s_blockgroup_lock
=
2941 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
2942 if (!sbi
->s_blockgroup_lock
) {
2946 sb
->s_fs_info
= sbi
;
2947 sbi
->s_mount_opt
= 0;
2948 sbi
->s_resuid
= EXT4_DEF_RESUID
;
2949 sbi
->s_resgid
= EXT4_DEF_RESGID
;
2950 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
2951 sbi
->s_sb_block
= sb_block
;
2952 if (sb
->s_bdev
->bd_part
)
2953 sbi
->s_sectors_written_start
=
2954 part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]);
2956 /* Cleanup superblock name */
2957 for (cp
= sb
->s_id
; (cp
= strchr(cp
, '/'));)
2961 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
2963 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
2968 * The ext4 superblock will not be buffer aligned for other than 1kB
2969 * block sizes. We need to calculate the offset from buffer start.
2971 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
2972 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
2973 offset
= do_div(logical_sb_block
, blocksize
);
2975 logical_sb_block
= sb_block
;
2978 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
2979 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
2983 * Note: s_es must be initialized as soon as possible because
2984 * some ext4 macro-instructions depend on its value
2986 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
2988 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
2989 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
2991 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
2993 /* Set defaults before we parse the mount options */
2994 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
2995 set_opt(sb
, INIT_INODE_TABLE
);
2996 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
2998 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
3000 if (def_mount_opts
& EXT4_DEFM_UID16
)
3001 set_opt(sb
, NO_UID32
);
3002 /* xattr user namespace & acls are now defaulted on */
3003 #ifdef CONFIG_EXT4_FS_XATTR
3004 set_opt(sb
, XATTR_USER
);
3006 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3007 set_opt(sb
, POSIX_ACL
);
3009 set_opt(sb
, MBLK_IO_SUBMIT
);
3010 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
3011 set_opt(sb
, JOURNAL_DATA
);
3012 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
3013 set_opt(sb
, ORDERED_DATA
);
3014 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
3015 set_opt(sb
, WRITEBACK_DATA
);
3017 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
3018 set_opt(sb
, ERRORS_PANIC
);
3019 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
3020 set_opt(sb
, ERRORS_CONT
);
3022 set_opt(sb
, ERRORS_RO
);
3023 if (def_mount_opts
& EXT4_DEFM_BLOCK_VALIDITY
)
3024 set_opt(sb
, BLOCK_VALIDITY
);
3025 if (def_mount_opts
& EXT4_DEFM_DISCARD
)
3026 set_opt(sb
, DISCARD
);
3028 sbi
->s_resuid
= le16_to_cpu(es
->s_def_resuid
);
3029 sbi
->s_resgid
= le16_to_cpu(es
->s_def_resgid
);
3030 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
3031 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
3032 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
3034 if ((def_mount_opts
& EXT4_DEFM_NOBARRIER
) == 0)
3035 set_opt(sb
, BARRIER
);
3038 * enable delayed allocation by default
3039 * Use -o nodelalloc to turn it off
3041 if (!IS_EXT3_SB(sb
) &&
3042 ((def_mount_opts
& EXT4_DEFM_NODELALLOC
) == 0))
3043 set_opt(sb
, DELALLOC
);
3046 * set default s_li_wait_mult for lazyinit, for the case there is
3047 * no mount option specified.
3049 sbi
->s_li_wait_mult
= EXT4_DEF_LI_WAIT_MULT
;
3051 if (!parse_options((char *) sbi
->s_es
->s_mount_opts
, sb
,
3052 &journal_devnum
, &journal_ioprio
, 0)) {
3053 ext4_msg(sb
, KERN_WARNING
,
3054 "failed to parse options in superblock: %s",
3055 sbi
->s_es
->s_mount_opts
);
3057 sbi
->s_def_mount_opt
= sbi
->s_mount_opt
;
3058 if (!parse_options((char *) data
, sb
, &journal_devnum
,
3059 &journal_ioprio
, 0))
3062 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
3063 printk_once(KERN_WARNING
"EXT4-fs: Warning: mounting "
3064 "with data=journal disables delayed "
3065 "allocation and O_DIRECT support!\n");
3066 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
3067 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3068 "both data=journal and delalloc");
3071 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
3072 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3073 "both data=journal and delalloc");
3076 if (test_opt(sb
, DELALLOC
))
3077 clear_opt(sb
, DELALLOC
);
3080 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
3081 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
3082 if (blocksize
< PAGE_SIZE
) {
3083 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3084 "dioread_nolock if block size != PAGE_SIZE");
3089 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3090 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
3092 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
3093 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
3094 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
3095 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
3096 ext4_msg(sb
, KERN_WARNING
,
3097 "feature flags set on rev 0 fs, "
3098 "running e2fsck is recommended");
3100 if (IS_EXT2_SB(sb
)) {
3101 if (ext2_feature_set_ok(sb
))
3102 ext4_msg(sb
, KERN_INFO
, "mounting ext2 file system "
3103 "using the ext4 subsystem");
3105 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext2 due "
3106 "to feature incompatibilities");
3111 if (IS_EXT3_SB(sb
)) {
3112 if (ext3_feature_set_ok(sb
))
3113 ext4_msg(sb
, KERN_INFO
, "mounting ext3 file system "
3114 "using the ext4 subsystem");
3116 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext3 due "
3117 "to feature incompatibilities");
3123 * Check feature flags regardless of the revision level, since we
3124 * previously didn't change the revision level when setting the flags,
3125 * so there is a chance incompat flags are set on a rev 0 filesystem.
3127 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
3130 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
3131 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
3132 ext4_msg(sb
, KERN_ERR
,
3133 "Unsupported filesystem blocksize %d", blocksize
);
3137 if (sb
->s_blocksize
!= blocksize
) {
3138 /* Validate the filesystem blocksize */
3139 if (!sb_set_blocksize(sb
, blocksize
)) {
3140 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
3146 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3147 offset
= do_div(logical_sb_block
, blocksize
);
3148 bh
= sb_bread(sb
, logical_sb_block
);
3150 ext4_msg(sb
, KERN_ERR
,
3151 "Can't read superblock on 2nd try");
3154 es
= (struct ext4_super_block
*)(((char *)bh
->b_data
) + offset
);
3156 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
3157 ext4_msg(sb
, KERN_ERR
,
3158 "Magic mismatch, very weird!");
3163 has_huge_files
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3164 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
);
3165 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
3167 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
3169 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
3170 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
3171 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
3173 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
3174 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
3175 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
3176 (!is_power_of_2(sbi
->s_inode_size
)) ||
3177 (sbi
->s_inode_size
> blocksize
)) {
3178 ext4_msg(sb
, KERN_ERR
,
3179 "unsupported inode size: %d",
3183 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
3184 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
3187 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
3188 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
3189 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
3190 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
3191 !is_power_of_2(sbi
->s_desc_size
)) {
3192 ext4_msg(sb
, KERN_ERR
,
3193 "unsupported descriptor size %lu",
3198 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
3200 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
3201 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
3202 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
3205 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
3206 if (sbi
->s_inodes_per_block
== 0)
3208 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
3209 sbi
->s_inodes_per_block
;
3210 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
3212 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3213 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
3214 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
3216 for (i
= 0; i
< 4; i
++)
3217 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
3218 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
3219 i
= le32_to_cpu(es
->s_flags
);
3220 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
3221 sbi
->s_hash_unsigned
= 3;
3222 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
3223 #ifdef __CHAR_UNSIGNED__
3224 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
3225 sbi
->s_hash_unsigned
= 3;
3227 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
3232 /* Handle clustersize */
3233 clustersize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_cluster_size
);
3234 has_bigalloc
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3235 EXT4_FEATURE_RO_COMPAT_BIGALLOC
);
3237 if (clustersize
< blocksize
) {
3238 ext4_msg(sb
, KERN_ERR
,
3239 "cluster size (%d) smaller than "
3240 "block size (%d)", clustersize
, blocksize
);
3243 sbi
->s_cluster_bits
= le32_to_cpu(es
->s_log_cluster_size
) -
3244 le32_to_cpu(es
->s_log_block_size
);
3245 sbi
->s_clusters_per_group
=
3246 le32_to_cpu(es
->s_clusters_per_group
);
3247 if (sbi
->s_clusters_per_group
> blocksize
* 8) {
3248 ext4_msg(sb
, KERN_ERR
,
3249 "#clusters per group too big: %lu",
3250 sbi
->s_clusters_per_group
);
3253 if (sbi
->s_blocks_per_group
!=
3254 (sbi
->s_clusters_per_group
* (clustersize
/ blocksize
))) {
3255 ext4_msg(sb
, KERN_ERR
, "blocks per group (%lu) and "
3256 "clusters per group (%lu) inconsistent",
3257 sbi
->s_blocks_per_group
,
3258 sbi
->s_clusters_per_group
);
3262 if (clustersize
!= blocksize
) {
3263 ext4_warning(sb
, "fragment/cluster size (%d) != "
3264 "block size (%d)", clustersize
,
3266 clustersize
= blocksize
;
3268 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
3269 ext4_msg(sb
, KERN_ERR
,
3270 "#blocks per group too big: %lu",
3271 sbi
->s_blocks_per_group
);
3274 sbi
->s_clusters_per_group
= sbi
->s_blocks_per_group
;
3275 sbi
->s_cluster_bits
= 0;
3277 sbi
->s_cluster_ratio
= clustersize
/ blocksize
;
3279 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
3280 ext4_msg(sb
, KERN_ERR
,
3281 "#inodes per group too big: %lu",
3282 sbi
->s_inodes_per_group
);
3287 * Test whether we have more sectors than will fit in sector_t,
3288 * and whether the max offset is addressable by the page cache.
3290 err
= generic_check_addressable(sb
->s_blocksize_bits
,
3291 ext4_blocks_count(es
));
3293 ext4_msg(sb
, KERN_ERR
, "filesystem"
3294 " too large to mount safely on this system");
3295 if (sizeof(sector_t
) < 8)
3296 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
3301 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
3304 /* check blocks count against device size */
3305 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
3306 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
3307 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
3308 "exceeds size of device (%llu blocks)",
3309 ext4_blocks_count(es
), blocks_count
);
3314 * It makes no sense for the first data block to be beyond the end
3315 * of the filesystem.
3317 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
3318 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data "
3319 "block %u is beyond end of filesystem (%llu)",
3320 le32_to_cpu(es
->s_first_data_block
),
3321 ext4_blocks_count(es
));
3324 blocks_count
= (ext4_blocks_count(es
) -
3325 le32_to_cpu(es
->s_first_data_block
) +
3326 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
3327 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
3328 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
3329 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
3330 "(block count %llu, first data block %u, "
3331 "blocks per group %lu)", sbi
->s_groups_count
,
3332 ext4_blocks_count(es
),
3333 le32_to_cpu(es
->s_first_data_block
),
3334 EXT4_BLOCKS_PER_GROUP(sb
));
3337 sbi
->s_groups_count
= blocks_count
;
3338 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
3339 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
3340 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
3341 EXT4_DESC_PER_BLOCK(sb
);
3342 sbi
->s_group_desc
= ext4_kvmalloc(db_count
*
3343 sizeof(struct buffer_head
*),
3345 if (sbi
->s_group_desc
== NULL
) {
3346 ext4_msg(sb
, KERN_ERR
, "not enough memory");
3351 sbi
->s_proc
= proc_mkdir(sb
->s_id
, ext4_proc_root
);
3353 bgl_lock_init(sbi
->s_blockgroup_lock
);
3355 for (i
= 0; i
< db_count
; i
++) {
3356 block
= descriptor_loc(sb
, logical_sb_block
, i
);
3357 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
3358 if (!sbi
->s_group_desc
[i
]) {
3359 ext4_msg(sb
, KERN_ERR
,
3360 "can't read group descriptor %d", i
);
3365 if (!ext4_check_descriptors(sb
, &first_not_zeroed
)) {
3366 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
3369 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
3370 if (!ext4_fill_flex_info(sb
)) {
3371 ext4_msg(sb
, KERN_ERR
,
3372 "unable to initialize "
3373 "flex_bg meta info!");
3377 sbi
->s_gdb_count
= db_count
;
3378 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
3379 spin_lock_init(&sbi
->s_next_gen_lock
);
3381 init_timer(&sbi
->s_err_report
);
3382 sbi
->s_err_report
.function
= print_daily_error_info
;
3383 sbi
->s_err_report
.data
= (unsigned long) sb
;
3385 err
= percpu_counter_init(&sbi
->s_freeclusters_counter
,
3386 ext4_count_free_clusters(sb
));
3388 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
3389 ext4_count_free_inodes(sb
));
3392 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
3393 ext4_count_dirs(sb
));
3396 err
= percpu_counter_init(&sbi
->s_dirtyclusters_counter
, 0);
3399 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
3403 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
3404 sbi
->s_max_writeback_mb_bump
= 128;
3407 * set up enough so that it can read an inode
3409 if (!test_opt(sb
, NOLOAD
) &&
3410 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
3411 sb
->s_op
= &ext4_sops
;
3413 sb
->s_op
= &ext4_nojournal_sops
;
3414 sb
->s_export_op
= &ext4_export_ops
;
3415 sb
->s_xattr
= ext4_xattr_handlers
;
3417 sb
->s_qcop
= &ext4_qctl_operations
;
3418 sb
->dq_op
= &ext4_quota_operations
;
3420 memcpy(sb
->s_uuid
, es
->s_uuid
, sizeof(es
->s_uuid
));
3422 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
3423 mutex_init(&sbi
->s_orphan_lock
);
3424 sbi
->s_resize_flags
= 0;
3428 needs_recovery
= (es
->s_last_orphan
!= 0 ||
3429 EXT4_HAS_INCOMPAT_FEATURE(sb
,
3430 EXT4_FEATURE_INCOMPAT_RECOVER
));
3432 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_MMP
) &&
3433 !(sb
->s_flags
& MS_RDONLY
))
3434 if (ext4_multi_mount_protect(sb
, le64_to_cpu(es
->s_mmp_block
)))
3438 * The first inode we look at is the journal inode. Don't try
3439 * root first: it may be modified in the journal!
3441 if (!test_opt(sb
, NOLOAD
) &&
3442 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
3443 if (ext4_load_journal(sb
, es
, journal_devnum
))
3445 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
3446 EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3447 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
3448 "suppressed and not mounted read-only");
3449 goto failed_mount_wq
;
3451 clear_opt(sb
, DATA_FLAGS
);
3452 sbi
->s_journal
= NULL
;
3457 if (ext4_blocks_count(es
) > 0xffffffffULL
&&
3458 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
3459 JBD2_FEATURE_INCOMPAT_64BIT
)) {
3460 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
3461 goto failed_mount_wq
;
3464 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
3465 jbd2_journal_set_features(sbi
->s_journal
,
3466 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
3467 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3468 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
3469 jbd2_journal_set_features(sbi
->s_journal
,
3470 JBD2_FEATURE_COMPAT_CHECKSUM
, 0, 0);
3471 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3472 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3474 jbd2_journal_clear_features(sbi
->s_journal
,
3475 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
3476 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3479 /* We have now updated the journal if required, so we can
3480 * validate the data journaling mode. */
3481 switch (test_opt(sb
, DATA_FLAGS
)) {
3483 /* No mode set, assume a default based on the journal
3484 * capabilities: ORDERED_DATA if the journal can
3485 * cope, else JOURNAL_DATA
3487 if (jbd2_journal_check_available_features
3488 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
3489 set_opt(sb
, ORDERED_DATA
);
3491 set_opt(sb
, JOURNAL_DATA
);
3494 case EXT4_MOUNT_ORDERED_DATA
:
3495 case EXT4_MOUNT_WRITEBACK_DATA
:
3496 if (!jbd2_journal_check_available_features
3497 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
3498 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
3499 "requested data journaling mode");
3500 goto failed_mount_wq
;
3505 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
3507 sbi
->s_journal
->j_commit_callback
= ext4_journal_commit_callback
;
3510 * The journal may have updated the bg summary counts, so we
3511 * need to update the global counters.
3513 percpu_counter_set(&sbi
->s_freeclusters_counter
,
3514 ext4_count_free_clusters(sb
));
3515 percpu_counter_set(&sbi
->s_freeinodes_counter
,
3516 ext4_count_free_inodes(sb
));
3517 percpu_counter_set(&sbi
->s_dirs_counter
,
3518 ext4_count_dirs(sb
));
3519 percpu_counter_set(&sbi
->s_dirtyclusters_counter
, 0);
3523 * The maximum number of concurrent works can be high and
3524 * concurrency isn't really necessary. Limit it to 1.
3526 EXT4_SB(sb
)->dio_unwritten_wq
=
3527 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM
| WQ_UNBOUND
, 1);
3528 if (!EXT4_SB(sb
)->dio_unwritten_wq
) {
3529 printk(KERN_ERR
"EXT4-fs: failed to create DIO workqueue\n");
3530 goto failed_mount_wq
;
3534 * The jbd2_journal_load will have done any necessary log recovery,
3535 * so we can safely mount the rest of the filesystem now.
3538 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
3540 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
3541 ret
= PTR_ERR(root
);
3545 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
3546 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
3550 sb
->s_root
= d_alloc_root(root
);
3553 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
3558 ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
);
3560 /* determine the minimum size of new large inodes, if present */
3561 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
3562 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
3563 EXT4_GOOD_OLD_INODE_SIZE
;
3564 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3565 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
3566 if (sbi
->s_want_extra_isize
<
3567 le16_to_cpu(es
->s_want_extra_isize
))
3568 sbi
->s_want_extra_isize
=
3569 le16_to_cpu(es
->s_want_extra_isize
);
3570 if (sbi
->s_want_extra_isize
<
3571 le16_to_cpu(es
->s_min_extra_isize
))
3572 sbi
->s_want_extra_isize
=
3573 le16_to_cpu(es
->s_min_extra_isize
);
3576 /* Check if enough inode space is available */
3577 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
3578 sbi
->s_inode_size
) {
3579 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
3580 EXT4_GOOD_OLD_INODE_SIZE
;
3581 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
3585 err
= ext4_setup_system_zone(sb
);
3587 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
3589 goto failed_mount4a
;
3593 err
= ext4_mb_init(sb
, needs_recovery
);
3595 ext4_msg(sb
, KERN_ERR
, "failed to initialize mballoc (%d)",
3600 err
= ext4_register_li_request(sb
, first_not_zeroed
);
3604 sbi
->s_kobj
.kset
= ext4_kset
;
3605 init_completion(&sbi
->s_kobj_unregister
);
3606 err
= kobject_init_and_add(&sbi
->s_kobj
, &ext4_ktype
, NULL
,
3611 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
3612 ext4_orphan_cleanup(sb
, es
);
3613 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
3614 if (needs_recovery
) {
3615 ext4_msg(sb
, KERN_INFO
, "recovery complete");
3616 ext4_mark_recovery_complete(sb
, es
);
3618 if (EXT4_SB(sb
)->s_journal
) {
3619 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
3620 descr
= " journalled data mode";
3621 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
3622 descr
= " ordered data mode";
3624 descr
= " writeback data mode";
3626 descr
= "out journal";
3628 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s. "
3629 "Opts: %s%s%s", descr
, sbi
->s_es
->s_mount_opts
,
3630 *sbi
->s_es
->s_mount_opts
? "; " : "", orig_data
);
3632 if (es
->s_error_count
)
3633 mod_timer(&sbi
->s_err_report
, jiffies
+ 300*HZ
); /* 5 minutes */
3640 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
3644 ext4_unregister_li_request(sb
);
3646 ext4_mb_release(sb
);
3648 ext4_ext_release(sb
);
3649 ext4_release_system_zone(sb
);
3654 ext4_msg(sb
, KERN_ERR
, "mount failed");
3655 destroy_workqueue(EXT4_SB(sb
)->dio_unwritten_wq
);
3657 if (sbi
->s_journal
) {
3658 jbd2_journal_destroy(sbi
->s_journal
);
3659 sbi
->s_journal
= NULL
;
3662 del_timer(&sbi
->s_err_report
);
3663 if (sbi
->s_flex_groups
)
3664 ext4_kvfree(sbi
->s_flex_groups
);
3665 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
3666 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
3667 percpu_counter_destroy(&sbi
->s_dirs_counter
);
3668 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
3670 kthread_stop(sbi
->s_mmp_tsk
);
3672 for (i
= 0; i
< db_count
; i
++)
3673 brelse(sbi
->s_group_desc
[i
]);
3674 ext4_kvfree(sbi
->s_group_desc
);
3677 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
3680 for (i
= 0; i
< MAXQUOTAS
; i
++)
3681 kfree(sbi
->s_qf_names
[i
]);
3683 ext4_blkdev_remove(sbi
);
3686 sb
->s_fs_info
= NULL
;
3687 kfree(sbi
->s_blockgroup_lock
);
3695 * Setup any per-fs journal parameters now. We'll do this both on
3696 * initial mount, once the journal has been initialised but before we've
3697 * done any recovery; and again on any subsequent remount.
3699 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
3701 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3703 journal
->j_commit_interval
= sbi
->s_commit_interval
;
3704 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
3705 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
3707 write_lock(&journal
->j_state_lock
);
3708 if (test_opt(sb
, BARRIER
))
3709 journal
->j_flags
|= JBD2_BARRIER
;
3711 journal
->j_flags
&= ~JBD2_BARRIER
;
3712 if (test_opt(sb
, DATA_ERR_ABORT
))
3713 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
3715 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
3716 write_unlock(&journal
->j_state_lock
);
3719 static journal_t
*ext4_get_journal(struct super_block
*sb
,
3720 unsigned int journal_inum
)
3722 struct inode
*journal_inode
;
3725 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3727 /* First, test for the existence of a valid inode on disk. Bad
3728 * things happen if we iget() an unused inode, as the subsequent
3729 * iput() will try to delete it. */
3731 journal_inode
= ext4_iget(sb
, journal_inum
);
3732 if (IS_ERR(journal_inode
)) {
3733 ext4_msg(sb
, KERN_ERR
, "no journal found");
3736 if (!journal_inode
->i_nlink
) {
3737 make_bad_inode(journal_inode
);
3738 iput(journal_inode
);
3739 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
3743 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3744 journal_inode
, journal_inode
->i_size
);
3745 if (!S_ISREG(journal_inode
->i_mode
)) {
3746 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
3747 iput(journal_inode
);
3751 journal
= jbd2_journal_init_inode(journal_inode
);
3753 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
3754 iput(journal_inode
);
3757 journal
->j_private
= sb
;
3758 ext4_init_journal_params(sb
, journal
);
3762 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
3765 struct buffer_head
*bh
;
3769 int hblock
, blocksize
;
3770 ext4_fsblk_t sb_block
;
3771 unsigned long offset
;
3772 struct ext4_super_block
*es
;
3773 struct block_device
*bdev
;
3775 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3777 bdev
= ext4_blkdev_get(j_dev
, sb
);
3781 blocksize
= sb
->s_blocksize
;
3782 hblock
= bdev_logical_block_size(bdev
);
3783 if (blocksize
< hblock
) {
3784 ext4_msg(sb
, KERN_ERR
,
3785 "blocksize too small for journal device");
3789 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
3790 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
3791 set_blocksize(bdev
, blocksize
);
3792 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
3793 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
3794 "external journal");
3798 es
= (struct ext4_super_block
*) (((char *)bh
->b_data
) + offset
);
3799 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
3800 !(le32_to_cpu(es
->s_feature_incompat
) &
3801 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
3802 ext4_msg(sb
, KERN_ERR
, "external journal has "
3808 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
3809 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
3814 len
= ext4_blocks_count(es
);
3815 start
= sb_block
+ 1;
3816 brelse(bh
); /* we're done with the superblock */
3818 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
3819 start
, len
, blocksize
);
3821 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
3824 journal
->j_private
= sb
;
3825 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
3826 wait_on_buffer(journal
->j_sb_buffer
);
3827 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
3828 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
3831 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
3832 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
3833 "user (unsupported) - %d",
3834 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
3837 EXT4_SB(sb
)->journal_bdev
= bdev
;
3838 ext4_init_journal_params(sb
, journal
);
3842 jbd2_journal_destroy(journal
);
3844 ext4_blkdev_put(bdev
);
3848 static int ext4_load_journal(struct super_block
*sb
,
3849 struct ext4_super_block
*es
,
3850 unsigned long journal_devnum
)
3853 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
3856 int really_read_only
;
3858 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
3860 if (journal_devnum
&&
3861 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3862 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
3863 "numbers have changed");
3864 journal_dev
= new_decode_dev(journal_devnum
);
3866 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
3868 really_read_only
= bdev_read_only(sb
->s_bdev
);
3871 * Are we loading a blank journal or performing recovery after a
3872 * crash? For recovery, we need to check in advance whether we
3873 * can get read-write access to the device.
3875 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3876 if (sb
->s_flags
& MS_RDONLY
) {
3877 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
3878 "required on readonly filesystem");
3879 if (really_read_only
) {
3880 ext4_msg(sb
, KERN_ERR
, "write access "
3881 "unavailable, cannot proceed");
3884 ext4_msg(sb
, KERN_INFO
, "write access will "
3885 "be enabled during recovery");
3889 if (journal_inum
&& journal_dev
) {
3890 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
3891 "and inode journals!");
3896 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
3899 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
3903 if (!(journal
->j_flags
& JBD2_BARRIER
))
3904 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
3906 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
3907 err
= jbd2_journal_wipe(journal
, !really_read_only
);
3909 char *save
= kmalloc(EXT4_S_ERR_LEN
, GFP_KERNEL
);
3911 memcpy(save
, ((char *) es
) +
3912 EXT4_S_ERR_START
, EXT4_S_ERR_LEN
);
3913 err
= jbd2_journal_load(journal
);
3915 memcpy(((char *) es
) + EXT4_S_ERR_START
,
3916 save
, EXT4_S_ERR_LEN
);
3921 ext4_msg(sb
, KERN_ERR
, "error loading journal");
3922 jbd2_journal_destroy(journal
);
3926 EXT4_SB(sb
)->s_journal
= journal
;
3927 ext4_clear_journal_err(sb
, es
);
3929 if (!really_read_only
&& journal_devnum
&&
3930 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
3931 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
3933 /* Make sure we flush the recovery flag to disk. */
3934 ext4_commit_super(sb
, 1);
3940 static int ext4_commit_super(struct super_block
*sb
, int sync
)
3942 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
3943 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
3946 if (!sbh
|| block_device_ejected(sb
))
3948 if (buffer_write_io_error(sbh
)) {
3950 * Oh, dear. A previous attempt to write the
3951 * superblock failed. This could happen because the
3952 * USB device was yanked out. Or it could happen to
3953 * be a transient write error and maybe the block will
3954 * be remapped. Nothing we can do but to retry the
3955 * write and hope for the best.
3957 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
3958 "superblock detected");
3959 clear_buffer_write_io_error(sbh
);
3960 set_buffer_uptodate(sbh
);
3963 * If the file system is mounted read-only, don't update the
3964 * superblock write time. This avoids updating the superblock
3965 * write time when we are mounting the root file system
3966 * read/only but we need to replay the journal; at that point,
3967 * for people who are east of GMT and who make their clock
3968 * tick in localtime for Windows bug-for-bug compatibility,
3969 * the clock is set in the future, and this will cause e2fsck
3970 * to complain and force a full file system check.
3972 if (!(sb
->s_flags
& MS_RDONLY
))
3973 es
->s_wtime
= cpu_to_le32(get_seconds());
3974 if (sb
->s_bdev
->bd_part
)
3975 es
->s_kbytes_written
=
3976 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
3977 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
3978 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
3980 es
->s_kbytes_written
=
3981 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
);
3982 ext4_free_blocks_count_set(es
,
3983 EXT4_C2B(EXT4_SB(sb
), percpu_counter_sum_positive(
3984 &EXT4_SB(sb
)->s_freeclusters_counter
)));
3985 es
->s_free_inodes_count
=
3986 cpu_to_le32(percpu_counter_sum_positive(
3987 &EXT4_SB(sb
)->s_freeinodes_counter
));
3989 BUFFER_TRACE(sbh
, "marking dirty");
3990 mark_buffer_dirty(sbh
);
3992 error
= sync_dirty_buffer(sbh
);
3996 error
= buffer_write_io_error(sbh
);
3998 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
4000 clear_buffer_write_io_error(sbh
);
4001 set_buffer_uptodate(sbh
);
4008 * Have we just finished recovery? If so, and if we are mounting (or
4009 * remounting) the filesystem readonly, then we will end up with a
4010 * consistent fs on disk. Record that fact.
4012 static void ext4_mark_recovery_complete(struct super_block
*sb
,
4013 struct ext4_super_block
*es
)
4015 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
4017 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
4018 BUG_ON(journal
!= NULL
);
4021 jbd2_journal_lock_updates(journal
);
4022 if (jbd2_journal_flush(journal
) < 0)
4025 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
4026 sb
->s_flags
& MS_RDONLY
) {
4027 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4028 ext4_commit_super(sb
, 1);
4032 jbd2_journal_unlock_updates(journal
);
4036 * If we are mounting (or read-write remounting) a filesystem whose journal
4037 * has recorded an error from a previous lifetime, move that error to the
4038 * main filesystem now.
4040 static void ext4_clear_journal_err(struct super_block
*sb
,
4041 struct ext4_super_block
*es
)
4047 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4049 journal
= EXT4_SB(sb
)->s_journal
;
4052 * Now check for any error status which may have been recorded in the
4053 * journal by a prior ext4_error() or ext4_abort()
4056 j_errno
= jbd2_journal_errno(journal
);
4060 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
4061 ext4_warning(sb
, "Filesystem error recorded "
4062 "from previous mount: %s", errstr
);
4063 ext4_warning(sb
, "Marking fs in need of filesystem check.");
4065 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
4066 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
4067 ext4_commit_super(sb
, 1);
4069 jbd2_journal_clear_err(journal
);
4074 * Force the running and committing transactions to commit,
4075 * and wait on the commit.
4077 int ext4_force_commit(struct super_block
*sb
)
4082 if (sb
->s_flags
& MS_RDONLY
)
4085 journal
= EXT4_SB(sb
)->s_journal
;
4087 vfs_check_frozen(sb
, SB_FREEZE_TRANS
);
4088 ret
= ext4_journal_force_commit(journal
);
4094 static void ext4_write_super(struct super_block
*sb
)
4097 ext4_commit_super(sb
, 1);
4101 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
4105 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4107 trace_ext4_sync_fs(sb
, wait
);
4108 flush_workqueue(sbi
->dio_unwritten_wq
);
4109 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
4111 jbd2_log_wait_commit(sbi
->s_journal
, target
);
4117 * LVM calls this function before a (read-only) snapshot is created. This
4118 * gives us a chance to flush the journal completely and mark the fs clean.
4120 * Note that only this function cannot bring a filesystem to be in a clean
4121 * state independently, because ext4 prevents a new handle from being started
4122 * by @sb->s_frozen, which stays in an upper layer. It thus needs help from
4125 static int ext4_freeze(struct super_block
*sb
)
4130 if (sb
->s_flags
& MS_RDONLY
)
4133 journal
= EXT4_SB(sb
)->s_journal
;
4135 /* Now we set up the journal barrier. */
4136 jbd2_journal_lock_updates(journal
);
4139 * Don't clear the needs_recovery flag if we failed to flush
4142 error
= jbd2_journal_flush(journal
);
4146 /* Journal blocked and flushed, clear needs_recovery flag. */
4147 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4148 error
= ext4_commit_super(sb
, 1);
4150 /* we rely on s_frozen to stop further updates */
4151 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
4156 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4157 * flag here, even though the filesystem is not technically dirty yet.
4159 static int ext4_unfreeze(struct super_block
*sb
)
4161 if (sb
->s_flags
& MS_RDONLY
)
4165 /* Reset the needs_recovery flag before the fs is unlocked. */
4166 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4167 ext4_commit_super(sb
, 1);
4173 * Structure to save mount options for ext4_remount's benefit
4175 struct ext4_mount_options
{
4176 unsigned long s_mount_opt
;
4177 unsigned long s_mount_opt2
;
4180 unsigned long s_commit_interval
;
4181 u32 s_min_batch_time
, s_max_batch_time
;
4184 char *s_qf_names
[MAXQUOTAS
];
4188 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
4190 struct ext4_super_block
*es
;
4191 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4192 unsigned long old_sb_flags
;
4193 struct ext4_mount_options old_opts
;
4194 int enable_quota
= 0;
4196 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
4201 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
4203 /* Store the original options */
4205 old_sb_flags
= sb
->s_flags
;
4206 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
4207 old_opts
.s_mount_opt2
= sbi
->s_mount_opt2
;
4208 old_opts
.s_resuid
= sbi
->s_resuid
;
4209 old_opts
.s_resgid
= sbi
->s_resgid
;
4210 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
4211 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
4212 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
4214 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
4215 for (i
= 0; i
< MAXQUOTAS
; i
++)
4216 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
4218 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
4219 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
4222 * Allow the "check" option to be passed as a remount option.
4224 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
, 1)) {
4229 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
4230 ext4_abort(sb
, "Abort forced by user");
4232 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
4233 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
4237 if (sbi
->s_journal
) {
4238 ext4_init_journal_params(sb
, sbi
->s_journal
);
4239 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
4242 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
)) {
4243 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
4248 if (*flags
& MS_RDONLY
) {
4249 err
= dquot_suspend(sb
, -1);
4254 * First of all, the unconditional stuff we have to do
4255 * to disable replay of the journal when we next remount
4257 sb
->s_flags
|= MS_RDONLY
;
4260 * OK, test if we are remounting a valid rw partition
4261 * readonly, and if so set the rdonly flag and then
4262 * mark the partition as valid again.
4264 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
4265 (sbi
->s_mount_state
& EXT4_VALID_FS
))
4266 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
4269 ext4_mark_recovery_complete(sb
, es
);
4271 /* Make sure we can mount this feature set readwrite */
4272 if (!ext4_feature_set_ok(sb
, 0)) {
4277 * Make sure the group descriptor checksums
4278 * are sane. If they aren't, refuse to remount r/w.
4280 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
4281 struct ext4_group_desc
*gdp
=
4282 ext4_get_group_desc(sb
, g
, NULL
);
4284 if (!ext4_group_desc_csum_verify(sbi
, g
, gdp
)) {
4285 ext4_msg(sb
, KERN_ERR
,
4286 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4287 g
, le16_to_cpu(ext4_group_desc_csum(sbi
, g
, gdp
)),
4288 le16_to_cpu(gdp
->bg_checksum
));
4295 * If we have an unprocessed orphan list hanging
4296 * around from a previously readonly bdev mount,
4297 * require a full umount/remount for now.
4299 if (es
->s_last_orphan
) {
4300 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
4301 "remount RDWR because of unprocessed "
4302 "orphan inode list. Please "
4303 "umount/remount instead");
4309 * Mounting a RDONLY partition read-write, so reread
4310 * and store the current valid flag. (It may have
4311 * been changed by e2fsck since we originally mounted
4315 ext4_clear_journal_err(sb
, es
);
4316 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
4317 if (!ext4_setup_super(sb
, es
, 0))
4318 sb
->s_flags
&= ~MS_RDONLY
;
4319 if (EXT4_HAS_INCOMPAT_FEATURE(sb
,
4320 EXT4_FEATURE_INCOMPAT_MMP
))
4321 if (ext4_multi_mount_protect(sb
,
4322 le64_to_cpu(es
->s_mmp_block
))) {
4331 * Reinitialize lazy itable initialization thread based on
4334 if ((sb
->s_flags
& MS_RDONLY
) || !test_opt(sb
, INIT_INODE_TABLE
))
4335 ext4_unregister_li_request(sb
);
4337 ext4_group_t first_not_zeroed
;
4338 first_not_zeroed
= ext4_has_uninit_itable(sb
);
4339 ext4_register_li_request(sb
, first_not_zeroed
);
4342 ext4_setup_system_zone(sb
);
4343 if (sbi
->s_journal
== NULL
)
4344 ext4_commit_super(sb
, 1);
4347 /* Release old quota file names */
4348 for (i
= 0; i
< MAXQUOTAS
; i
++)
4349 if (old_opts
.s_qf_names
[i
] &&
4350 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
4351 kfree(old_opts
.s_qf_names
[i
]);
4355 dquot_resume(sb
, -1);
4357 ext4_msg(sb
, KERN_INFO
, "re-mounted. Opts: %s", orig_data
);
4362 sb
->s_flags
= old_sb_flags
;
4363 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
4364 sbi
->s_mount_opt2
= old_opts
.s_mount_opt2
;
4365 sbi
->s_resuid
= old_opts
.s_resuid
;
4366 sbi
->s_resgid
= old_opts
.s_resgid
;
4367 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
4368 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
4369 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
4371 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
4372 for (i
= 0; i
< MAXQUOTAS
; i
++) {
4373 if (sbi
->s_qf_names
[i
] &&
4374 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
4375 kfree(sbi
->s_qf_names
[i
]);
4376 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
4385 * Note: calculating the overhead so we can be compatible with
4386 * historical BSD practice is quite difficult in the face of
4387 * clusters/bigalloc. This is because multiple metadata blocks from
4388 * different block group can end up in the same allocation cluster.
4389 * Calculating the exact overhead in the face of clustered allocation
4390 * requires either O(all block bitmaps) in memory or O(number of block
4391 * groups**2) in time. We will still calculate the superblock for
4392 * older file systems --- and if we come across with a bigalloc file
4393 * system with zero in s_overhead_clusters the estimate will be close to
4394 * correct especially for very large cluster sizes --- but for newer
4395 * file systems, it's better to calculate this figure once at mkfs
4396 * time, and store it in the superblock. If the superblock value is
4397 * present (even for non-bigalloc file systems), we will use it.
4399 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
4401 struct super_block
*sb
= dentry
->d_sb
;
4402 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4403 struct ext4_super_block
*es
= sbi
->s_es
;
4404 struct ext4_group_desc
*gdp
;
4408 if (test_opt(sb
, MINIX_DF
)) {
4409 sbi
->s_overhead_last
= 0;
4410 } else if (es
->s_overhead_clusters
) {
4411 sbi
->s_overhead_last
= le32_to_cpu(es
->s_overhead_clusters
);
4412 } else if (sbi
->s_blocks_last
!= ext4_blocks_count(es
)) {
4413 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
4414 ext4_fsblk_t overhead
= 0;
4417 * Compute the overhead (FS structures). This is constant
4418 * for a given filesystem unless the number of block groups
4419 * changes so we cache the previous value until it does.
4423 * All of the blocks before first_data_block are
4426 overhead
= EXT4_B2C(sbi
, le32_to_cpu(es
->s_first_data_block
));
4429 * Add the overhead found in each block group
4431 for (i
= 0; i
< ngroups
; i
++) {
4432 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
4433 overhead
+= ext4_num_overhead_clusters(sb
, i
, gdp
);
4436 sbi
->s_overhead_last
= overhead
;
4438 sbi
->s_blocks_last
= ext4_blocks_count(es
);
4441 buf
->f_type
= EXT4_SUPER_MAGIC
;
4442 buf
->f_bsize
= sb
->s_blocksize
;
4443 buf
->f_blocks
= (ext4_blocks_count(es
) -
4444 EXT4_C2B(sbi
, sbi
->s_overhead_last
));
4445 bfree
= percpu_counter_sum_positive(&sbi
->s_freeclusters_counter
) -
4446 percpu_counter_sum_positive(&sbi
->s_dirtyclusters_counter
);
4447 /* prevent underflow in case that few free space is available */
4448 buf
->f_bfree
= EXT4_C2B(sbi
, max_t(s64
, bfree
, 0));
4449 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
4450 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
4452 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
4453 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
4454 buf
->f_namelen
= EXT4_NAME_LEN
;
4455 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
4456 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
4457 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
4458 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
4463 /* Helper function for writing quotas on sync - we need to start transaction
4464 * before quota file is locked for write. Otherwise the are possible deadlocks:
4465 * Process 1 Process 2
4466 * ext4_create() quota_sync()
4467 * jbd2_journal_start() write_dquot()
4468 * dquot_initialize() down(dqio_mutex)
4469 * down(dqio_mutex) jbd2_journal_start()
4475 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
4477 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_type
];
4480 static int ext4_write_dquot(struct dquot
*dquot
)
4484 struct inode
*inode
;
4486 inode
= dquot_to_inode(dquot
);
4487 handle
= ext4_journal_start(inode
,
4488 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
4490 return PTR_ERR(handle
);
4491 ret
= dquot_commit(dquot
);
4492 err
= ext4_journal_stop(handle
);
4498 static int ext4_acquire_dquot(struct dquot
*dquot
)
4503 handle
= ext4_journal_start(dquot_to_inode(dquot
),
4504 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
4506 return PTR_ERR(handle
);
4507 ret
= dquot_acquire(dquot
);
4508 err
= ext4_journal_stop(handle
);
4514 static int ext4_release_dquot(struct dquot
*dquot
)
4519 handle
= ext4_journal_start(dquot_to_inode(dquot
),
4520 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
4521 if (IS_ERR(handle
)) {
4522 /* Release dquot anyway to avoid endless cycle in dqput() */
4523 dquot_release(dquot
);
4524 return PTR_ERR(handle
);
4526 ret
= dquot_release(dquot
);
4527 err
= ext4_journal_stop(handle
);
4533 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
4535 /* Are we journaling quotas? */
4536 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
4537 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
4538 dquot_mark_dquot_dirty(dquot
);
4539 return ext4_write_dquot(dquot
);
4541 return dquot_mark_dquot_dirty(dquot
);
4545 static int ext4_write_info(struct super_block
*sb
, int type
)
4550 /* Data block + inode block */
4551 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
4553 return PTR_ERR(handle
);
4554 ret
= dquot_commit_info(sb
, type
);
4555 err
= ext4_journal_stop(handle
);
4562 * Turn on quotas during mount time - we need to find
4563 * the quota file and such...
4565 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
4567 return dquot_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
4568 EXT4_SB(sb
)->s_jquota_fmt
, type
);
4572 * Standard function to be called on quota_on
4574 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
4579 if (!test_opt(sb
, QUOTA
))
4582 /* Quotafile not on the same filesystem? */
4583 if (path
->dentry
->d_sb
!= sb
)
4585 /* Journaling quota? */
4586 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
4587 /* Quotafile not in fs root? */
4588 if (path
->dentry
->d_parent
!= sb
->s_root
)
4589 ext4_msg(sb
, KERN_WARNING
,
4590 "Quota file not on filesystem root. "
4591 "Journaled quota will not work");
4595 * When we journal data on quota file, we have to flush journal to see
4596 * all updates to the file when we bypass pagecache...
4598 if (EXT4_SB(sb
)->s_journal
&&
4599 ext4_should_journal_data(path
->dentry
->d_inode
)) {
4601 * We don't need to lock updates but journal_flush() could
4602 * otherwise be livelocked...
4604 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
4605 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
4606 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
4611 return dquot_quota_on(sb
, type
, format_id
, path
);
4614 static int ext4_quota_off(struct super_block
*sb
, int type
)
4616 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
4619 /* Force all delayed allocation blocks to be allocated.
4620 * Caller already holds s_umount sem */
4621 if (test_opt(sb
, DELALLOC
))
4622 sync_filesystem(sb
);
4627 /* Update modification times of quota files when userspace can
4628 * start looking at them */
4629 handle
= ext4_journal_start(inode
, 1);
4632 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
4633 ext4_mark_inode_dirty(handle
, inode
);
4634 ext4_journal_stop(handle
);
4637 return dquot_quota_off(sb
, type
);
4640 /* Read data from quotafile - avoid pagecache and such because we cannot afford
4641 * acquiring the locks... As quota files are never truncated and quota code
4642 * itself serializes the operations (and no one else should touch the files)
4643 * we don't have to be afraid of races */
4644 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
4645 size_t len
, loff_t off
)
4647 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
4648 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
4650 int offset
= off
& (sb
->s_blocksize
- 1);
4653 struct buffer_head
*bh
;
4654 loff_t i_size
= i_size_read(inode
);
4658 if (off
+len
> i_size
)
4661 while (toread
> 0) {
4662 tocopy
= sb
->s_blocksize
- offset
< toread
?
4663 sb
->s_blocksize
- offset
: toread
;
4664 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
4667 if (!bh
) /* A hole? */
4668 memset(data
, 0, tocopy
);
4670 memcpy(data
, bh
->b_data
+offset
, tocopy
);
4680 /* Write to quotafile (we know the transaction is already started and has
4681 * enough credits) */
4682 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
4683 const char *data
, size_t len
, loff_t off
)
4685 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
4686 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
4688 int offset
= off
& (sb
->s_blocksize
- 1);
4689 struct buffer_head
*bh
;
4690 handle_t
*handle
= journal_current_handle();
4692 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
4693 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
4694 " cancelled because transaction is not started",
4695 (unsigned long long)off
, (unsigned long long)len
);
4699 * Since we account only one data block in transaction credits,
4700 * then it is impossible to cross a block boundary.
4702 if (sb
->s_blocksize
- offset
< len
) {
4703 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
4704 " cancelled because not block aligned",
4705 (unsigned long long)off
, (unsigned long long)len
);
4709 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_QUOTA
);
4710 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
4713 err
= ext4_journal_get_write_access(handle
, bh
);
4719 memcpy(bh
->b_data
+offset
, data
, len
);
4720 flush_dcache_page(bh
->b_page
);
4722 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
4726 mutex_unlock(&inode
->i_mutex
);
4729 if (inode
->i_size
< off
+ len
) {
4730 i_size_write(inode
, off
+ len
);
4731 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
4732 ext4_mark_inode_dirty(handle
, inode
);
4734 mutex_unlock(&inode
->i_mutex
);
4740 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
4741 const char *dev_name
, void *data
)
4743 return mount_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
);
4746 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4747 static inline void register_as_ext2(void)
4749 int err
= register_filesystem(&ext2_fs_type
);
4752 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
4755 static inline void unregister_as_ext2(void)
4757 unregister_filesystem(&ext2_fs_type
);
4760 static inline int ext2_feature_set_ok(struct super_block
*sb
)
4762 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT2_FEATURE_INCOMPAT_SUPP
))
4764 if (sb
->s_flags
& MS_RDONLY
)
4766 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT2_FEATURE_RO_COMPAT_SUPP
))
4770 MODULE_ALIAS("ext2");
4772 static inline void register_as_ext2(void) { }
4773 static inline void unregister_as_ext2(void) { }
4774 static inline int ext2_feature_set_ok(struct super_block
*sb
) { return 0; }
4777 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4778 static inline void register_as_ext3(void)
4780 int err
= register_filesystem(&ext3_fs_type
);
4783 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
4786 static inline void unregister_as_ext3(void)
4788 unregister_filesystem(&ext3_fs_type
);
4791 static inline int ext3_feature_set_ok(struct super_block
*sb
)
4793 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT3_FEATURE_INCOMPAT_SUPP
))
4795 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
4797 if (sb
->s_flags
& MS_RDONLY
)
4799 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT3_FEATURE_RO_COMPAT_SUPP
))
4803 MODULE_ALIAS("ext3");
4805 static inline void register_as_ext3(void) { }
4806 static inline void unregister_as_ext3(void) { }
4807 static inline int ext3_feature_set_ok(struct super_block
*sb
) { return 0; }
4810 static struct file_system_type ext4_fs_type
= {
4811 .owner
= THIS_MODULE
,
4813 .mount
= ext4_mount
,
4814 .kill_sb
= kill_block_super
,
4815 .fs_flags
= FS_REQUIRES_DEV
,
4818 static int __init
ext4_init_feat_adverts(void)
4820 struct ext4_features
*ef
;
4823 ef
= kzalloc(sizeof(struct ext4_features
), GFP_KERNEL
);
4827 ef
->f_kobj
.kset
= ext4_kset
;
4828 init_completion(&ef
->f_kobj_unregister
);
4829 ret
= kobject_init_and_add(&ef
->f_kobj
, &ext4_feat_ktype
, NULL
,
4842 static void ext4_exit_feat_adverts(void)
4844 kobject_put(&ext4_feat
->f_kobj
);
4845 wait_for_completion(&ext4_feat
->f_kobj_unregister
);
4849 /* Shared across all ext4 file systems */
4850 wait_queue_head_t ext4__ioend_wq
[EXT4_WQ_HASH_SZ
];
4851 struct mutex ext4__aio_mutex
[EXT4_WQ_HASH_SZ
];
4853 static int __init
ext4_init_fs(void)
4857 ext4_check_flag_values();
4859 for (i
= 0; i
< EXT4_WQ_HASH_SZ
; i
++) {
4860 mutex_init(&ext4__aio_mutex
[i
]);
4861 init_waitqueue_head(&ext4__ioend_wq
[i
]);
4864 err
= ext4_init_pageio();
4867 err
= ext4_init_system_zone();
4870 ext4_kset
= kset_create_and_add("ext4", NULL
, fs_kobj
);
4873 ext4_proc_root
= proc_mkdir("fs/ext4", NULL
);
4875 err
= ext4_init_feat_adverts();
4879 err
= ext4_init_mballoc();
4883 err
= ext4_init_xattr();
4886 err
= init_inodecache();
4891 err
= register_filesystem(&ext4_fs_type
);
4895 ext4_li_info
= NULL
;
4896 mutex_init(&ext4_li_mtx
);
4899 unregister_as_ext2();
4900 unregister_as_ext3();
4901 destroy_inodecache();
4905 ext4_exit_mballoc();
4907 ext4_exit_feat_adverts();
4910 remove_proc_entry("fs/ext4", NULL
);
4911 kset_unregister(ext4_kset
);
4913 ext4_exit_system_zone();
4919 static void __exit
ext4_exit_fs(void)
4921 ext4_destroy_lazyinit_thread();
4922 unregister_as_ext2();
4923 unregister_as_ext3();
4924 unregister_filesystem(&ext4_fs_type
);
4925 destroy_inodecache();
4927 ext4_exit_mballoc();
4928 ext4_exit_feat_adverts();
4929 remove_proc_entry("fs/ext4", NULL
);
4930 kset_unregister(ext4_kset
);
4931 ext4_exit_system_zone();
4935 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4936 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4937 MODULE_LICENSE("GPL");
4938 module_init(ext4_init_fs
)
4939 module_exit(ext4_exit_fs
)