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 int ext4_freeze(struct super_block
*sb
);
78 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
79 const char *dev_name
, void *data
);
80 static inline int ext2_feature_set_ok(struct super_block
*sb
);
81 static inline int ext3_feature_set_ok(struct super_block
*sb
);
82 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
);
83 static void ext4_destroy_lazyinit_thread(void);
84 static void ext4_unregister_li_request(struct super_block
*sb
);
85 static void ext4_clear_request_list(void);
87 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
88 static struct file_system_type ext2_fs_type
= {
92 .kill_sb
= kill_block_super
,
93 .fs_flags
= FS_REQUIRES_DEV
,
95 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
97 #define IS_EXT2_SB(sb) (0)
101 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
102 static struct file_system_type ext3_fs_type
= {
103 .owner
= THIS_MODULE
,
106 .kill_sb
= kill_block_super
,
107 .fs_flags
= FS_REQUIRES_DEV
,
109 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
111 #define IS_EXT3_SB(sb) (0)
114 static int ext4_verify_csum_type(struct super_block
*sb
,
115 struct ext4_super_block
*es
)
117 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
,
118 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))
121 return es
->s_checksum_type
== EXT4_CRC32C_CHKSUM
;
124 static __le32
ext4_superblock_csum(struct super_block
*sb
,
125 struct ext4_super_block
*es
)
127 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
128 int offset
= offsetof(struct ext4_super_block
, s_checksum
);
131 csum
= ext4_chksum(sbi
, ~0, (char *)es
, offset
);
133 return cpu_to_le32(csum
);
136 int ext4_superblock_csum_verify(struct super_block
*sb
,
137 struct ext4_super_block
*es
)
139 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
,
140 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))
143 return es
->s_checksum
== ext4_superblock_csum(sb
, es
);
146 void ext4_superblock_csum_set(struct super_block
*sb
,
147 struct ext4_super_block
*es
)
149 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
,
150 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))
153 es
->s_checksum
= ext4_superblock_csum(sb
, es
);
156 void *ext4_kvmalloc(size_t size
, gfp_t flags
)
160 ret
= kmalloc(size
, flags
);
162 ret
= __vmalloc(size
, flags
, PAGE_KERNEL
);
166 void *ext4_kvzalloc(size_t size
, gfp_t flags
)
170 ret
= kzalloc(size
, flags
);
172 ret
= __vmalloc(size
, flags
| __GFP_ZERO
, PAGE_KERNEL
);
176 void ext4_kvfree(void *ptr
)
178 if (is_vmalloc_addr(ptr
))
185 ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
186 struct ext4_group_desc
*bg
)
188 return le32_to_cpu(bg
->bg_block_bitmap_lo
) |
189 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
190 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
193 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
194 struct ext4_group_desc
*bg
)
196 return le32_to_cpu(bg
->bg_inode_bitmap_lo
) |
197 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
198 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
201 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
202 struct ext4_group_desc
*bg
)
204 return le32_to_cpu(bg
->bg_inode_table_lo
) |
205 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
206 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
209 __u32
ext4_free_group_clusters(struct super_block
*sb
,
210 struct ext4_group_desc
*bg
)
212 return le16_to_cpu(bg
->bg_free_blocks_count_lo
) |
213 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
214 (__u32
)le16_to_cpu(bg
->bg_free_blocks_count_hi
) << 16 : 0);
217 __u32
ext4_free_inodes_count(struct super_block
*sb
,
218 struct ext4_group_desc
*bg
)
220 return le16_to_cpu(bg
->bg_free_inodes_count_lo
) |
221 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
222 (__u32
)le16_to_cpu(bg
->bg_free_inodes_count_hi
) << 16 : 0);
225 __u32
ext4_used_dirs_count(struct super_block
*sb
,
226 struct ext4_group_desc
*bg
)
228 return le16_to_cpu(bg
->bg_used_dirs_count_lo
) |
229 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
230 (__u32
)le16_to_cpu(bg
->bg_used_dirs_count_hi
) << 16 : 0);
233 __u32
ext4_itable_unused_count(struct super_block
*sb
,
234 struct ext4_group_desc
*bg
)
236 return le16_to_cpu(bg
->bg_itable_unused_lo
) |
237 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
238 (__u32
)le16_to_cpu(bg
->bg_itable_unused_hi
) << 16 : 0);
241 void ext4_block_bitmap_set(struct super_block
*sb
,
242 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
244 bg
->bg_block_bitmap_lo
= cpu_to_le32((u32
)blk
);
245 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
246 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
249 void ext4_inode_bitmap_set(struct super_block
*sb
,
250 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
252 bg
->bg_inode_bitmap_lo
= cpu_to_le32((u32
)blk
);
253 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
254 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
257 void ext4_inode_table_set(struct super_block
*sb
,
258 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
260 bg
->bg_inode_table_lo
= cpu_to_le32((u32
)blk
);
261 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
262 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
265 void ext4_free_group_clusters_set(struct super_block
*sb
,
266 struct ext4_group_desc
*bg
, __u32 count
)
268 bg
->bg_free_blocks_count_lo
= cpu_to_le16((__u16
)count
);
269 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
270 bg
->bg_free_blocks_count_hi
= cpu_to_le16(count
>> 16);
273 void ext4_free_inodes_set(struct super_block
*sb
,
274 struct ext4_group_desc
*bg
, __u32 count
)
276 bg
->bg_free_inodes_count_lo
= cpu_to_le16((__u16
)count
);
277 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
278 bg
->bg_free_inodes_count_hi
= cpu_to_le16(count
>> 16);
281 void ext4_used_dirs_set(struct super_block
*sb
,
282 struct ext4_group_desc
*bg
, __u32 count
)
284 bg
->bg_used_dirs_count_lo
= cpu_to_le16((__u16
)count
);
285 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
286 bg
->bg_used_dirs_count_hi
= cpu_to_le16(count
>> 16);
289 void ext4_itable_unused_set(struct super_block
*sb
,
290 struct ext4_group_desc
*bg
, __u32 count
)
292 bg
->bg_itable_unused_lo
= cpu_to_le16((__u16
)count
);
293 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
294 bg
->bg_itable_unused_hi
= cpu_to_le16(count
>> 16);
298 /* Just increment the non-pointer handle value */
299 static handle_t
*ext4_get_nojournal(void)
301 handle_t
*handle
= current
->journal_info
;
302 unsigned long ref_cnt
= (unsigned long)handle
;
304 BUG_ON(ref_cnt
>= EXT4_NOJOURNAL_MAX_REF_COUNT
);
307 handle
= (handle_t
*)ref_cnt
;
309 current
->journal_info
= handle
;
314 /* Decrement the non-pointer handle value */
315 static void ext4_put_nojournal(handle_t
*handle
)
317 unsigned long ref_cnt
= (unsigned long)handle
;
319 BUG_ON(ref_cnt
== 0);
322 handle
= (handle_t
*)ref_cnt
;
324 current
->journal_info
= handle
;
328 * Wrappers for jbd2_journal_start/end.
330 * The only special thing we need to do here is to make sure that all
331 * journal_end calls result in the superblock being marked dirty, so
332 * that sync() will call the filesystem's write_super callback if
335 * To avoid j_barrier hold in userspace when a user calls freeze(),
336 * ext4 prevents a new handle from being started by s_frozen, which
337 * is in an upper layer.
339 handle_t
*ext4_journal_start_sb(struct super_block
*sb
, int nblocks
)
344 trace_ext4_journal_start(sb
, nblocks
, _RET_IP_
);
345 if (sb
->s_flags
& MS_RDONLY
)
346 return ERR_PTR(-EROFS
);
348 journal
= EXT4_SB(sb
)->s_journal
;
349 handle
= ext4_journal_current_handle();
352 * If a handle has been started, it should be allowed to
353 * finish, otherwise deadlock could happen between freeze
354 * and others(e.g. truncate) due to the restart of the
355 * journal handle if the filesystem is forzen and active
356 * handles are not stopped.
359 vfs_check_frozen(sb
, SB_FREEZE_TRANS
);
362 return ext4_get_nojournal();
364 * Special case here: if the journal has aborted behind our
365 * backs (eg. EIO in the commit thread), then we still need to
366 * take the FS itself readonly cleanly.
368 if (is_journal_aborted(journal
)) {
369 ext4_abort(sb
, "Detected aborted journal");
370 return ERR_PTR(-EROFS
);
372 return jbd2_journal_start(journal
, nblocks
);
376 * The only special thing we need to do here is to make sure that all
377 * jbd2_journal_stop calls result in the superblock being marked dirty, so
378 * that sync() will call the filesystem's write_super callback if
381 int __ext4_journal_stop(const char *where
, unsigned int line
, handle_t
*handle
)
383 struct super_block
*sb
;
387 if (!ext4_handle_valid(handle
)) {
388 ext4_put_nojournal(handle
);
391 sb
= handle
->h_transaction
->t_journal
->j_private
;
393 rc
= jbd2_journal_stop(handle
);
398 __ext4_std_error(sb
, where
, line
, err
);
402 void ext4_journal_abort_handle(const char *caller
, unsigned int line
,
403 const char *err_fn
, struct buffer_head
*bh
,
404 handle_t
*handle
, int err
)
407 const char *errstr
= ext4_decode_error(NULL
, err
, nbuf
);
409 BUG_ON(!ext4_handle_valid(handle
));
412 BUFFER_TRACE(bh
, "abort");
417 if (is_handle_aborted(handle
))
420 printk(KERN_ERR
"EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
421 caller
, line
, errstr
, err_fn
);
423 jbd2_journal_abort_handle(handle
);
426 static void __save_error_info(struct super_block
*sb
, const char *func
,
429 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
431 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
432 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
433 es
->s_last_error_time
= cpu_to_le32(get_seconds());
434 strncpy(es
->s_last_error_func
, func
, sizeof(es
->s_last_error_func
));
435 es
->s_last_error_line
= cpu_to_le32(line
);
436 if (!es
->s_first_error_time
) {
437 es
->s_first_error_time
= es
->s_last_error_time
;
438 strncpy(es
->s_first_error_func
, func
,
439 sizeof(es
->s_first_error_func
));
440 es
->s_first_error_line
= cpu_to_le32(line
);
441 es
->s_first_error_ino
= es
->s_last_error_ino
;
442 es
->s_first_error_block
= es
->s_last_error_block
;
445 * Start the daily error reporting function if it hasn't been
448 if (!es
->s_error_count
)
449 mod_timer(&EXT4_SB(sb
)->s_err_report
, jiffies
+ 24*60*60*HZ
);
450 es
->s_error_count
= cpu_to_le32(le32_to_cpu(es
->s_error_count
) + 1);
453 static void save_error_info(struct super_block
*sb
, const char *func
,
456 __save_error_info(sb
, func
, line
);
457 ext4_commit_super(sb
, 1);
461 * The del_gendisk() function uninitializes the disk-specific data
462 * structures, including the bdi structure, without telling anyone
463 * else. Once this happens, any attempt to call mark_buffer_dirty()
464 * (for example, by ext4_commit_super), will cause a kernel OOPS.
465 * This is a kludge to prevent these oops until we can put in a proper
466 * hook in del_gendisk() to inform the VFS and file system layers.
468 static int block_device_ejected(struct super_block
*sb
)
470 struct inode
*bd_inode
= sb
->s_bdev
->bd_inode
;
471 struct backing_dev_info
*bdi
= bd_inode
->i_mapping
->backing_dev_info
;
473 return bdi
->dev
== NULL
;
476 static void ext4_journal_commit_callback(journal_t
*journal
, transaction_t
*txn
)
478 struct super_block
*sb
= journal
->j_private
;
479 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
480 int error
= is_journal_aborted(journal
);
481 struct ext4_journal_cb_entry
*jce
, *tmp
;
483 spin_lock(&sbi
->s_md_lock
);
484 list_for_each_entry_safe(jce
, tmp
, &txn
->t_private_list
, jce_list
) {
485 list_del_init(&jce
->jce_list
);
486 spin_unlock(&sbi
->s_md_lock
);
487 jce
->jce_func(sb
, jce
, error
);
488 spin_lock(&sbi
->s_md_lock
);
490 spin_unlock(&sbi
->s_md_lock
);
493 /* Deal with the reporting of failure conditions on a filesystem such as
494 * inconsistencies detected or read IO failures.
496 * On ext2, we can store the error state of the filesystem in the
497 * superblock. That is not possible on ext4, because we may have other
498 * write ordering constraints on the superblock which prevent us from
499 * writing it out straight away; and given that the journal is about to
500 * be aborted, we can't rely on the current, or future, transactions to
501 * write out the superblock safely.
503 * We'll just use the jbd2_journal_abort() error code to record an error in
504 * the journal instead. On recovery, the journal will complain about
505 * that error until we've noted it down and cleared it.
508 static void ext4_handle_error(struct super_block
*sb
)
510 if (sb
->s_flags
& MS_RDONLY
)
513 if (!test_opt(sb
, ERRORS_CONT
)) {
514 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
516 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
518 jbd2_journal_abort(journal
, -EIO
);
520 if (test_opt(sb
, ERRORS_RO
)) {
521 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
522 sb
->s_flags
|= MS_RDONLY
;
524 if (test_opt(sb
, ERRORS_PANIC
))
525 panic("EXT4-fs (device %s): panic forced after error\n",
529 void __ext4_error(struct super_block
*sb
, const char *function
,
530 unsigned int line
, const char *fmt
, ...)
532 struct va_format vaf
;
538 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
539 sb
->s_id
, function
, line
, current
->comm
, &vaf
);
541 save_error_info(sb
, function
, line
);
543 ext4_handle_error(sb
);
546 void ext4_error_inode(struct inode
*inode
, const char *function
,
547 unsigned int line
, ext4_fsblk_t block
,
548 const char *fmt
, ...)
551 struct va_format vaf
;
552 struct ext4_super_block
*es
= EXT4_SB(inode
->i_sb
)->s_es
;
554 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
555 es
->s_last_error_block
= cpu_to_le64(block
);
556 save_error_info(inode
->i_sb
, function
, line
);
561 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
562 "inode #%lu: block %llu: comm %s: %pV\n",
563 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
564 block
, current
->comm
, &vaf
);
566 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
567 "inode #%lu: comm %s: %pV\n",
568 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
569 current
->comm
, &vaf
);
572 ext4_handle_error(inode
->i_sb
);
575 void ext4_error_file(struct file
*file
, const char *function
,
576 unsigned int line
, ext4_fsblk_t block
,
577 const char *fmt
, ...)
580 struct va_format vaf
;
581 struct ext4_super_block
*es
;
582 struct inode
*inode
= file
->f_dentry
->d_inode
;
583 char pathname
[80], *path
;
585 es
= EXT4_SB(inode
->i_sb
)->s_es
;
586 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
587 save_error_info(inode
->i_sb
, function
, line
);
588 path
= d_path(&(file
->f_path
), pathname
, sizeof(pathname
));
596 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
597 "block %llu: comm %s: path %s: %pV\n",
598 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
599 block
, current
->comm
, path
, &vaf
);
602 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
603 "comm %s: path %s: %pV\n",
604 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
605 current
->comm
, path
, &vaf
);
608 ext4_handle_error(inode
->i_sb
);
611 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
618 errstr
= "IO failure";
621 errstr
= "Out of memory";
624 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
625 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
626 errstr
= "Journal has aborted";
628 errstr
= "Readonly filesystem";
631 /* If the caller passed in an extra buffer for unknown
632 * errors, textualise them now. Else we just return
635 /* Check for truncated error codes... */
636 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
645 /* __ext4_std_error decodes expected errors from journaling functions
646 * automatically and invokes the appropriate error response. */
648 void __ext4_std_error(struct super_block
*sb
, const char *function
,
649 unsigned int line
, int errno
)
654 /* Special case: if the error is EROFS, and we're not already
655 * inside a transaction, then there's really no point in logging
657 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
658 (sb
->s_flags
& MS_RDONLY
))
661 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
662 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s:%d: %s\n",
663 sb
->s_id
, function
, line
, errstr
);
664 save_error_info(sb
, function
, line
);
666 ext4_handle_error(sb
);
670 * ext4_abort is a much stronger failure handler than ext4_error. The
671 * abort function may be used to deal with unrecoverable failures such
672 * as journal IO errors or ENOMEM at a critical moment in log management.
674 * We unconditionally force the filesystem into an ABORT|READONLY state,
675 * unless the error response on the fs has been set to panic in which
676 * case we take the easy way out and panic immediately.
679 void __ext4_abort(struct super_block
*sb
, const char *function
,
680 unsigned int line
, const char *fmt
, ...)
684 save_error_info(sb
, function
, line
);
686 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: ", sb
->s_id
,
692 if ((sb
->s_flags
& MS_RDONLY
) == 0) {
693 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
694 sb
->s_flags
|= MS_RDONLY
;
695 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
696 if (EXT4_SB(sb
)->s_journal
)
697 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
698 save_error_info(sb
, function
, line
);
700 if (test_opt(sb
, ERRORS_PANIC
))
701 panic("EXT4-fs panic from previous error\n");
704 void ext4_msg(struct super_block
*sb
, const char *prefix
, const char *fmt
, ...)
706 struct va_format vaf
;
712 printk("%sEXT4-fs (%s): %pV\n", prefix
, sb
->s_id
, &vaf
);
716 void __ext4_warning(struct super_block
*sb
, const char *function
,
717 unsigned int line
, const char *fmt
, ...)
719 struct va_format vaf
;
725 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: %pV\n",
726 sb
->s_id
, function
, line
, &vaf
);
730 void __ext4_grp_locked_error(const char *function
, unsigned int line
,
731 struct super_block
*sb
, ext4_group_t grp
,
732 unsigned long ino
, ext4_fsblk_t block
,
733 const char *fmt
, ...)
737 struct va_format vaf
;
739 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
741 es
->s_last_error_ino
= cpu_to_le32(ino
);
742 es
->s_last_error_block
= cpu_to_le64(block
);
743 __save_error_info(sb
, function
, line
);
749 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: group %u, ",
750 sb
->s_id
, function
, line
, grp
);
752 printk(KERN_CONT
"inode %lu: ", ino
);
754 printk(KERN_CONT
"block %llu:", (unsigned long long) block
);
755 printk(KERN_CONT
"%pV\n", &vaf
);
758 if (test_opt(sb
, ERRORS_CONT
)) {
759 ext4_commit_super(sb
, 0);
763 ext4_unlock_group(sb
, grp
);
764 ext4_handle_error(sb
);
766 * We only get here in the ERRORS_RO case; relocking the group
767 * may be dangerous, but nothing bad will happen since the
768 * filesystem will have already been marked read/only and the
769 * journal has been aborted. We return 1 as a hint to callers
770 * who might what to use the return value from
771 * ext4_grp_locked_error() to distinguish between the
772 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
773 * aggressively from the ext4 function in question, with a
774 * more appropriate error code.
776 ext4_lock_group(sb
, grp
);
780 void ext4_update_dynamic_rev(struct super_block
*sb
)
782 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
784 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
788 "updating to rev %d because of new feature flag, "
789 "running e2fsck is recommended",
792 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
793 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
794 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
795 /* leave es->s_feature_*compat flags alone */
796 /* es->s_uuid will be set by e2fsck if empty */
799 * The rest of the superblock fields should be zero, and if not it
800 * means they are likely already in use, so leave them alone. We
801 * can leave it up to e2fsck to clean up any inconsistencies there.
806 * Open the external journal device
808 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
810 struct block_device
*bdev
;
811 char b
[BDEVNAME_SIZE
];
813 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
, sb
);
819 ext4_msg(sb
, KERN_ERR
, "failed to open journal device %s: %ld",
820 __bdevname(dev
, b
), PTR_ERR(bdev
));
825 * Release the journal device
827 static int ext4_blkdev_put(struct block_device
*bdev
)
829 return blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
832 static int ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
834 struct block_device
*bdev
;
837 bdev
= sbi
->journal_bdev
;
839 ret
= ext4_blkdev_put(bdev
);
840 sbi
->journal_bdev
= NULL
;
845 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
847 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
850 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
854 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
855 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
857 printk(KERN_ERR
"sb_info orphan list:\n");
858 list_for_each(l
, &sbi
->s_orphan
) {
859 struct inode
*inode
= orphan_list_entry(l
);
861 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
862 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
863 inode
->i_mode
, inode
->i_nlink
,
868 static void ext4_put_super(struct super_block
*sb
)
870 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
871 struct ext4_super_block
*es
= sbi
->s_es
;
874 ext4_unregister_li_request(sb
);
875 dquot_disable(sb
, -1, DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
877 flush_workqueue(sbi
->dio_unwritten_wq
);
878 destroy_workqueue(sbi
->dio_unwritten_wq
);
881 if (sbi
->s_journal
) {
882 err
= jbd2_journal_destroy(sbi
->s_journal
);
883 sbi
->s_journal
= NULL
;
885 ext4_abort(sb
, "Couldn't clean up the journal");
888 del_timer(&sbi
->s_err_report
);
889 ext4_release_system_zone(sb
);
891 ext4_ext_release(sb
);
892 ext4_xattr_put_super(sb
);
894 if (!(sb
->s_flags
& MS_RDONLY
)) {
895 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
896 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
898 if (!(sb
->s_flags
& MS_RDONLY
))
899 ext4_commit_super(sb
, 1);
902 remove_proc_entry("options", sbi
->s_proc
);
903 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
905 kobject_del(&sbi
->s_kobj
);
907 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
908 brelse(sbi
->s_group_desc
[i
]);
909 ext4_kvfree(sbi
->s_group_desc
);
910 ext4_kvfree(sbi
->s_flex_groups
);
911 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
912 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
913 percpu_counter_destroy(&sbi
->s_dirs_counter
);
914 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
917 for (i
= 0; i
< MAXQUOTAS
; i
++)
918 kfree(sbi
->s_qf_names
[i
]);
921 /* Debugging code just in case the in-memory inode orphan list
922 * isn't empty. The on-disk one can be non-empty if we've
923 * detected an error and taken the fs readonly, but the
924 * in-memory list had better be clean by this point. */
925 if (!list_empty(&sbi
->s_orphan
))
926 dump_orphan_list(sb
, sbi
);
927 J_ASSERT(list_empty(&sbi
->s_orphan
));
929 invalidate_bdev(sb
->s_bdev
);
930 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
932 * Invalidate the journal device's buffers. We don't want them
933 * floating about in memory - the physical journal device may
934 * hotswapped, and it breaks the `ro-after' testing code.
936 sync_blockdev(sbi
->journal_bdev
);
937 invalidate_bdev(sbi
->journal_bdev
);
938 ext4_blkdev_remove(sbi
);
941 kthread_stop(sbi
->s_mmp_tsk
);
942 sb
->s_fs_info
= NULL
;
944 * Now that we are completely done shutting down the
945 * superblock, we need to actually destroy the kobject.
948 kobject_put(&sbi
->s_kobj
);
949 wait_for_completion(&sbi
->s_kobj_unregister
);
950 if (sbi
->s_chksum_driver
)
951 crypto_free_shash(sbi
->s_chksum_driver
);
952 kfree(sbi
->s_blockgroup_lock
);
956 static struct kmem_cache
*ext4_inode_cachep
;
959 * Called inside transaction, so use GFP_NOFS
961 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
963 struct ext4_inode_info
*ei
;
965 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
969 ei
->vfs_inode
.i_version
= 1;
970 ei
->vfs_inode
.i_data
.writeback_index
= 0;
971 memset(&ei
->i_cached_extent
, 0, sizeof(struct ext4_ext_cache
));
972 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
973 spin_lock_init(&ei
->i_prealloc_lock
);
974 ei
->i_reserved_data_blocks
= 0;
975 ei
->i_reserved_meta_blocks
= 0;
976 ei
->i_allocated_meta_blocks
= 0;
977 ei
->i_da_metadata_calc_len
= 0;
978 spin_lock_init(&(ei
->i_block_reservation_lock
));
980 ei
->i_reserved_quota
= 0;
983 INIT_LIST_HEAD(&ei
->i_completed_io_list
);
984 spin_lock_init(&ei
->i_completed_io_lock
);
985 ei
->cur_aio_dio
= NULL
;
987 ei
->i_datasync_tid
= 0;
988 atomic_set(&ei
->i_ioend_count
, 0);
989 atomic_set(&ei
->i_aiodio_unwritten
, 0);
991 return &ei
->vfs_inode
;
994 static int ext4_drop_inode(struct inode
*inode
)
996 int drop
= generic_drop_inode(inode
);
998 trace_ext4_drop_inode(inode
, drop
);
1002 static void ext4_i_callback(struct rcu_head
*head
)
1004 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
1005 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
1008 static void ext4_destroy_inode(struct inode
*inode
)
1010 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
1011 ext4_msg(inode
->i_sb
, KERN_ERR
,
1012 "Inode %lu (%p): orphan list check failed!",
1013 inode
->i_ino
, EXT4_I(inode
));
1014 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
1015 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
1019 call_rcu(&inode
->i_rcu
, ext4_i_callback
);
1022 static void init_once(void *foo
)
1024 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
1026 INIT_LIST_HEAD(&ei
->i_orphan
);
1027 #ifdef CONFIG_EXT4_FS_XATTR
1028 init_rwsem(&ei
->xattr_sem
);
1030 init_rwsem(&ei
->i_data_sem
);
1031 inode_init_once(&ei
->vfs_inode
);
1034 static int init_inodecache(void)
1036 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
1037 sizeof(struct ext4_inode_info
),
1038 0, (SLAB_RECLAIM_ACCOUNT
|
1041 if (ext4_inode_cachep
== NULL
)
1046 static void destroy_inodecache(void)
1048 kmem_cache_destroy(ext4_inode_cachep
);
1051 void ext4_clear_inode(struct inode
*inode
)
1053 invalidate_inode_buffers(inode
);
1056 ext4_discard_preallocations(inode
);
1057 if (EXT4_I(inode
)->jinode
) {
1058 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode
),
1059 EXT4_I(inode
)->jinode
);
1060 jbd2_free_inode(EXT4_I(inode
)->jinode
);
1061 EXT4_I(inode
)->jinode
= NULL
;
1065 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
1066 u64 ino
, u32 generation
)
1068 struct inode
*inode
;
1070 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
1071 return ERR_PTR(-ESTALE
);
1072 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
1073 return ERR_PTR(-ESTALE
);
1075 /* iget isn't really right if the inode is currently unallocated!!
1077 * ext4_read_inode will return a bad_inode if the inode had been
1078 * deleted, so we should be safe.
1080 * Currently we don't know the generation for parent directory, so
1081 * a generation of 0 means "accept any"
1083 inode
= ext4_iget(sb
, ino
);
1085 return ERR_CAST(inode
);
1086 if (generation
&& inode
->i_generation
!= generation
) {
1088 return ERR_PTR(-ESTALE
);
1094 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
1095 int fh_len
, int fh_type
)
1097 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
1098 ext4_nfs_get_inode
);
1101 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
1102 int fh_len
, int fh_type
)
1104 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
1105 ext4_nfs_get_inode
);
1109 * Try to release metadata pages (indirect blocks, directories) which are
1110 * mapped via the block device. Since these pages could have journal heads
1111 * which would prevent try_to_free_buffers() from freeing them, we must use
1112 * jbd2 layer's try_to_free_buffers() function to release them.
1114 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
1117 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
1119 WARN_ON(PageChecked(page
));
1120 if (!page_has_buffers(page
))
1123 return jbd2_journal_try_to_free_buffers(journal
, page
,
1124 wait
& ~__GFP_WAIT
);
1125 return try_to_free_buffers(page
);
1129 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1130 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1132 static int ext4_write_dquot(struct dquot
*dquot
);
1133 static int ext4_acquire_dquot(struct dquot
*dquot
);
1134 static int ext4_release_dquot(struct dquot
*dquot
);
1135 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1136 static int ext4_write_info(struct super_block
*sb
, int type
);
1137 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1139 static int ext4_quota_on_sysfile(struct super_block
*sb
, int type
,
1141 static int ext4_quota_off(struct super_block
*sb
, int type
);
1142 static int ext4_quota_off_sysfile(struct super_block
*sb
, int type
);
1143 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1144 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1145 size_t len
, loff_t off
);
1146 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1147 const char *data
, size_t len
, loff_t off
);
1148 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
1149 unsigned int flags
);
1150 static int ext4_enable_quotas(struct super_block
*sb
);
1152 static const struct dquot_operations ext4_quota_operations
= {
1153 .get_reserved_space
= ext4_get_reserved_space
,
1154 .write_dquot
= ext4_write_dquot
,
1155 .acquire_dquot
= ext4_acquire_dquot
,
1156 .release_dquot
= ext4_release_dquot
,
1157 .mark_dirty
= ext4_mark_dquot_dirty
,
1158 .write_info
= ext4_write_info
,
1159 .alloc_dquot
= dquot_alloc
,
1160 .destroy_dquot
= dquot_destroy
,
1163 static const struct quotactl_ops ext4_qctl_operations
= {
1164 .quota_on
= ext4_quota_on
,
1165 .quota_off
= ext4_quota_off
,
1166 .quota_sync
= dquot_quota_sync
,
1167 .get_info
= dquot_get_dqinfo
,
1168 .set_info
= dquot_set_dqinfo
,
1169 .get_dqblk
= dquot_get_dqblk
,
1170 .set_dqblk
= dquot_set_dqblk
1173 static const struct quotactl_ops ext4_qctl_sysfile_operations
= {
1174 .quota_on_meta
= ext4_quota_on_sysfile
,
1175 .quota_off
= ext4_quota_off_sysfile
,
1176 .quota_sync
= dquot_quota_sync
,
1177 .get_info
= dquot_get_dqinfo
,
1178 .set_info
= dquot_set_dqinfo
,
1179 .get_dqblk
= dquot_get_dqblk
,
1180 .set_dqblk
= dquot_set_dqblk
1184 static const struct super_operations ext4_sops
= {
1185 .alloc_inode
= ext4_alloc_inode
,
1186 .destroy_inode
= ext4_destroy_inode
,
1187 .write_inode
= ext4_write_inode
,
1188 .dirty_inode
= ext4_dirty_inode
,
1189 .drop_inode
= ext4_drop_inode
,
1190 .evict_inode
= ext4_evict_inode
,
1191 .put_super
= ext4_put_super
,
1192 .sync_fs
= ext4_sync_fs
,
1193 .freeze_fs
= ext4_freeze
,
1194 .unfreeze_fs
= ext4_unfreeze
,
1195 .statfs
= ext4_statfs
,
1196 .remount_fs
= ext4_remount
,
1197 .show_options
= ext4_show_options
,
1199 .quota_read
= ext4_quota_read
,
1200 .quota_write
= ext4_quota_write
,
1202 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1205 static const struct super_operations ext4_nojournal_sops
= {
1206 .alloc_inode
= ext4_alloc_inode
,
1207 .destroy_inode
= ext4_destroy_inode
,
1208 .write_inode
= ext4_write_inode
,
1209 .dirty_inode
= ext4_dirty_inode
,
1210 .drop_inode
= ext4_drop_inode
,
1211 .evict_inode
= ext4_evict_inode
,
1212 .put_super
= ext4_put_super
,
1213 .statfs
= ext4_statfs
,
1214 .remount_fs
= ext4_remount
,
1215 .show_options
= ext4_show_options
,
1217 .quota_read
= ext4_quota_read
,
1218 .quota_write
= ext4_quota_write
,
1220 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1223 static const struct export_operations ext4_export_ops
= {
1224 .fh_to_dentry
= ext4_fh_to_dentry
,
1225 .fh_to_parent
= ext4_fh_to_parent
,
1226 .get_parent
= ext4_get_parent
,
1230 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1231 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1232 Opt_nouid32
, Opt_debug
, Opt_removed
,
1233 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1234 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
,
1235 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
,
1236 Opt_journal_dev
, Opt_journal_checksum
, Opt_journal_async_commit
,
1237 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1238 Opt_data_err_abort
, Opt_data_err_ignore
,
1239 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1240 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1241 Opt_noquota
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1242 Opt_usrquota
, Opt_grpquota
, Opt_i_version
,
1243 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
, Opt_mblk_io_submit
,
1244 Opt_nomblk_io_submit
, Opt_block_validity
, Opt_noblock_validity
,
1245 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1246 Opt_dioread_nolock
, Opt_dioread_lock
,
1247 Opt_discard
, Opt_nodiscard
, Opt_init_itable
, Opt_noinit_itable
,
1250 static const match_table_t tokens
= {
1251 {Opt_bsd_df
, "bsddf"},
1252 {Opt_minix_df
, "minixdf"},
1253 {Opt_grpid
, "grpid"},
1254 {Opt_grpid
, "bsdgroups"},
1255 {Opt_nogrpid
, "nogrpid"},
1256 {Opt_nogrpid
, "sysvgroups"},
1257 {Opt_resgid
, "resgid=%u"},
1258 {Opt_resuid
, "resuid=%u"},
1260 {Opt_err_cont
, "errors=continue"},
1261 {Opt_err_panic
, "errors=panic"},
1262 {Opt_err_ro
, "errors=remount-ro"},
1263 {Opt_nouid32
, "nouid32"},
1264 {Opt_debug
, "debug"},
1265 {Opt_removed
, "oldalloc"},
1266 {Opt_removed
, "orlov"},
1267 {Opt_user_xattr
, "user_xattr"},
1268 {Opt_nouser_xattr
, "nouser_xattr"},
1270 {Opt_noacl
, "noacl"},
1271 {Opt_noload
, "norecovery"},
1272 {Opt_noload
, "noload"},
1273 {Opt_removed
, "nobh"},
1274 {Opt_removed
, "bh"},
1275 {Opt_commit
, "commit=%u"},
1276 {Opt_min_batch_time
, "min_batch_time=%u"},
1277 {Opt_max_batch_time
, "max_batch_time=%u"},
1278 {Opt_journal_dev
, "journal_dev=%u"},
1279 {Opt_journal_checksum
, "journal_checksum"},
1280 {Opt_journal_async_commit
, "journal_async_commit"},
1281 {Opt_abort
, "abort"},
1282 {Opt_data_journal
, "data=journal"},
1283 {Opt_data_ordered
, "data=ordered"},
1284 {Opt_data_writeback
, "data=writeback"},
1285 {Opt_data_err_abort
, "data_err=abort"},
1286 {Opt_data_err_ignore
, "data_err=ignore"},
1287 {Opt_offusrjquota
, "usrjquota="},
1288 {Opt_usrjquota
, "usrjquota=%s"},
1289 {Opt_offgrpjquota
, "grpjquota="},
1290 {Opt_grpjquota
, "grpjquota=%s"},
1291 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1292 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1293 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1294 {Opt_grpquota
, "grpquota"},
1295 {Opt_noquota
, "noquota"},
1296 {Opt_quota
, "quota"},
1297 {Opt_usrquota
, "usrquota"},
1298 {Opt_barrier
, "barrier=%u"},
1299 {Opt_barrier
, "barrier"},
1300 {Opt_nobarrier
, "nobarrier"},
1301 {Opt_i_version
, "i_version"},
1302 {Opt_stripe
, "stripe=%u"},
1303 {Opt_delalloc
, "delalloc"},
1304 {Opt_nodelalloc
, "nodelalloc"},
1305 {Opt_mblk_io_submit
, "mblk_io_submit"},
1306 {Opt_nomblk_io_submit
, "nomblk_io_submit"},
1307 {Opt_block_validity
, "block_validity"},
1308 {Opt_noblock_validity
, "noblock_validity"},
1309 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1310 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1311 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1312 {Opt_auto_da_alloc
, "auto_da_alloc"},
1313 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1314 {Opt_dioread_nolock
, "dioread_nolock"},
1315 {Opt_dioread_lock
, "dioread_lock"},
1316 {Opt_discard
, "discard"},
1317 {Opt_nodiscard
, "nodiscard"},
1318 {Opt_init_itable
, "init_itable=%u"},
1319 {Opt_init_itable
, "init_itable"},
1320 {Opt_noinit_itable
, "noinit_itable"},
1321 {Opt_removed
, "check=none"}, /* mount option from ext2/3 */
1322 {Opt_removed
, "nocheck"}, /* mount option from ext2/3 */
1323 {Opt_removed
, "reservation"}, /* mount option from ext2/3 */
1324 {Opt_removed
, "noreservation"}, /* mount option from ext2/3 */
1325 {Opt_removed
, "journal=%u"}, /* mount option from ext2/3 */
1329 static ext4_fsblk_t
get_sb_block(void **data
)
1331 ext4_fsblk_t sb_block
;
1332 char *options
= (char *) *data
;
1334 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1335 return 1; /* Default location */
1338 /* TODO: use simple_strtoll with >32bit ext4 */
1339 sb_block
= simple_strtoul(options
, &options
, 0);
1340 if (*options
&& *options
!= ',') {
1341 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1345 if (*options
== ',')
1347 *data
= (void *) options
;
1352 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1353 static char deprecated_msg
[] = "Mount option \"%s\" will be removed by %s\n"
1354 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1357 static int set_qf_name(struct super_block
*sb
, int qtype
, substring_t
*args
)
1359 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1362 if (sb_any_quota_loaded(sb
) &&
1363 !sbi
->s_qf_names
[qtype
]) {
1364 ext4_msg(sb
, KERN_ERR
,
1365 "Cannot change journaled "
1366 "quota options when quota turned on");
1369 qname
= match_strdup(args
);
1371 ext4_msg(sb
, KERN_ERR
,
1372 "Not enough memory for storing quotafile name");
1375 if (sbi
->s_qf_names
[qtype
] &&
1376 strcmp(sbi
->s_qf_names
[qtype
], qname
)) {
1377 ext4_msg(sb
, KERN_ERR
,
1378 "%s quota file already specified", QTYPE2NAME(qtype
));
1382 sbi
->s_qf_names
[qtype
] = qname
;
1383 if (strchr(sbi
->s_qf_names
[qtype
], '/')) {
1384 ext4_msg(sb
, KERN_ERR
,
1385 "quotafile must be on filesystem root");
1386 kfree(sbi
->s_qf_names
[qtype
]);
1387 sbi
->s_qf_names
[qtype
] = NULL
;
1394 static int clear_qf_name(struct super_block
*sb
, int qtype
)
1397 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1399 if (sb_any_quota_loaded(sb
) &&
1400 sbi
->s_qf_names
[qtype
]) {
1401 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled quota options"
1402 " when quota turned on");
1406 * The space will be released later when all options are confirmed
1409 sbi
->s_qf_names
[qtype
] = NULL
;
1414 #define MOPT_SET 0x0001
1415 #define MOPT_CLEAR 0x0002
1416 #define MOPT_NOSUPPORT 0x0004
1417 #define MOPT_EXPLICIT 0x0008
1418 #define MOPT_CLEAR_ERR 0x0010
1419 #define MOPT_GTE0 0x0020
1422 #define MOPT_QFMT 0x0040
1424 #define MOPT_Q MOPT_NOSUPPORT
1425 #define MOPT_QFMT MOPT_NOSUPPORT
1427 #define MOPT_DATAJ 0x0080
1429 static const struct mount_opts
{
1433 } ext4_mount_opts
[] = {
1434 {Opt_minix_df
, EXT4_MOUNT_MINIX_DF
, MOPT_SET
},
1435 {Opt_bsd_df
, EXT4_MOUNT_MINIX_DF
, MOPT_CLEAR
},
1436 {Opt_grpid
, EXT4_MOUNT_GRPID
, MOPT_SET
},
1437 {Opt_nogrpid
, EXT4_MOUNT_GRPID
, MOPT_CLEAR
},
1438 {Opt_mblk_io_submit
, EXT4_MOUNT_MBLK_IO_SUBMIT
, MOPT_SET
},
1439 {Opt_nomblk_io_submit
, EXT4_MOUNT_MBLK_IO_SUBMIT
, MOPT_CLEAR
},
1440 {Opt_block_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_SET
},
1441 {Opt_noblock_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_CLEAR
},
1442 {Opt_dioread_nolock
, EXT4_MOUNT_DIOREAD_NOLOCK
, MOPT_SET
},
1443 {Opt_dioread_lock
, EXT4_MOUNT_DIOREAD_NOLOCK
, MOPT_CLEAR
},
1444 {Opt_discard
, EXT4_MOUNT_DISCARD
, MOPT_SET
},
1445 {Opt_nodiscard
, EXT4_MOUNT_DISCARD
, MOPT_CLEAR
},
1446 {Opt_delalloc
, EXT4_MOUNT_DELALLOC
, MOPT_SET
| MOPT_EXPLICIT
},
1447 {Opt_nodelalloc
, EXT4_MOUNT_DELALLOC
, MOPT_CLEAR
| MOPT_EXPLICIT
},
1448 {Opt_journal_checksum
, EXT4_MOUNT_JOURNAL_CHECKSUM
, MOPT_SET
},
1449 {Opt_journal_async_commit
, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT
|
1450 EXT4_MOUNT_JOURNAL_CHECKSUM
), MOPT_SET
},
1451 {Opt_noload
, EXT4_MOUNT_NOLOAD
, MOPT_SET
},
1452 {Opt_err_panic
, EXT4_MOUNT_ERRORS_PANIC
, MOPT_SET
| MOPT_CLEAR_ERR
},
1453 {Opt_err_ro
, EXT4_MOUNT_ERRORS_RO
, MOPT_SET
| MOPT_CLEAR_ERR
},
1454 {Opt_err_cont
, EXT4_MOUNT_ERRORS_CONT
, MOPT_SET
| MOPT_CLEAR_ERR
},
1455 {Opt_data_err_abort
, EXT4_MOUNT_DATA_ERR_ABORT
, MOPT_SET
},
1456 {Opt_data_err_ignore
, EXT4_MOUNT_DATA_ERR_ABORT
, MOPT_CLEAR
},
1457 {Opt_barrier
, EXT4_MOUNT_BARRIER
, MOPT_SET
},
1458 {Opt_nobarrier
, EXT4_MOUNT_BARRIER
, MOPT_CLEAR
},
1459 {Opt_noauto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_SET
},
1460 {Opt_auto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_CLEAR
},
1461 {Opt_noinit_itable
, EXT4_MOUNT_INIT_INODE_TABLE
, MOPT_CLEAR
},
1462 {Opt_commit
, 0, MOPT_GTE0
},
1463 {Opt_max_batch_time
, 0, MOPT_GTE0
},
1464 {Opt_min_batch_time
, 0, MOPT_GTE0
},
1465 {Opt_inode_readahead_blks
, 0, MOPT_GTE0
},
1466 {Opt_init_itable
, 0, MOPT_GTE0
},
1467 {Opt_stripe
, 0, MOPT_GTE0
},
1468 {Opt_data_journal
, EXT4_MOUNT_JOURNAL_DATA
, MOPT_DATAJ
},
1469 {Opt_data_ordered
, EXT4_MOUNT_ORDERED_DATA
, MOPT_DATAJ
},
1470 {Opt_data_writeback
, EXT4_MOUNT_WRITEBACK_DATA
, MOPT_DATAJ
},
1471 #ifdef CONFIG_EXT4_FS_XATTR
1472 {Opt_user_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_SET
},
1473 {Opt_nouser_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_CLEAR
},
1475 {Opt_user_xattr
, 0, MOPT_NOSUPPORT
},
1476 {Opt_nouser_xattr
, 0, MOPT_NOSUPPORT
},
1478 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1479 {Opt_acl
, EXT4_MOUNT_POSIX_ACL
, MOPT_SET
},
1480 {Opt_noacl
, EXT4_MOUNT_POSIX_ACL
, MOPT_CLEAR
},
1482 {Opt_acl
, 0, MOPT_NOSUPPORT
},
1483 {Opt_noacl
, 0, MOPT_NOSUPPORT
},
1485 {Opt_nouid32
, EXT4_MOUNT_NO_UID32
, MOPT_SET
},
1486 {Opt_debug
, EXT4_MOUNT_DEBUG
, MOPT_SET
},
1487 {Opt_quota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
, MOPT_SET
| MOPT_Q
},
1488 {Opt_usrquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
,
1490 {Opt_grpquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_GRPQUOTA
,
1492 {Opt_noquota
, (EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
|
1493 EXT4_MOUNT_GRPQUOTA
), MOPT_CLEAR
| MOPT_Q
},
1494 {Opt_usrjquota
, 0, MOPT_Q
},
1495 {Opt_grpjquota
, 0, MOPT_Q
},
1496 {Opt_offusrjquota
, 0, MOPT_Q
},
1497 {Opt_offgrpjquota
, 0, MOPT_Q
},
1498 {Opt_jqfmt_vfsold
, QFMT_VFS_OLD
, MOPT_QFMT
},
1499 {Opt_jqfmt_vfsv0
, QFMT_VFS_V0
, MOPT_QFMT
},
1500 {Opt_jqfmt_vfsv1
, QFMT_VFS_V1
, MOPT_QFMT
},
1504 static int handle_mount_opt(struct super_block
*sb
, char *opt
, int token
,
1505 substring_t
*args
, unsigned long *journal_devnum
,
1506 unsigned int *journal_ioprio
, int is_remount
)
1508 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1509 const struct mount_opts
*m
;
1515 if (token
== Opt_usrjquota
)
1516 return set_qf_name(sb
, USRQUOTA
, &args
[0]);
1517 else if (token
== Opt_grpjquota
)
1518 return set_qf_name(sb
, GRPQUOTA
, &args
[0]);
1519 else if (token
== Opt_offusrjquota
)
1520 return clear_qf_name(sb
, USRQUOTA
);
1521 else if (token
== Opt_offgrpjquota
)
1522 return clear_qf_name(sb
, GRPQUOTA
);
1524 if (args
->from
&& match_int(args
, &arg
))
1528 case Opt_nouser_xattr
:
1529 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, opt
, "3.5");
1532 return 1; /* handled by get_sb_block() */
1534 ext4_msg(sb
, KERN_WARNING
,
1535 "Ignoring removed %s option", opt
);
1538 uid
= make_kuid(current_user_ns(), arg
);
1539 if (!uid_valid(uid
)) {
1540 ext4_msg(sb
, KERN_ERR
, "Invalid uid value %d", arg
);
1543 sbi
->s_resuid
= uid
;
1546 gid
= make_kgid(current_user_ns(), arg
);
1547 if (!gid_valid(gid
)) {
1548 ext4_msg(sb
, KERN_ERR
, "Invalid gid value %d", arg
);
1551 sbi
->s_resgid
= gid
;
1554 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1557 sb
->s_flags
|= MS_I_VERSION
;
1559 case Opt_journal_dev
:
1561 ext4_msg(sb
, KERN_ERR
,
1562 "Cannot specify journal on remount");
1565 *journal_devnum
= arg
;
1567 case Opt_journal_ioprio
:
1568 if (arg
< 0 || arg
> 7)
1570 *journal_ioprio
= IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
, arg
);
1574 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++) {
1575 if (token
!= m
->token
)
1577 if (args
->from
&& (m
->flags
& MOPT_GTE0
) && (arg
< 0))
1579 if (m
->flags
& MOPT_EXPLICIT
)
1580 set_opt2(sb
, EXPLICIT_DELALLOC
);
1581 if (m
->flags
& MOPT_CLEAR_ERR
)
1582 clear_opt(sb
, ERRORS_MASK
);
1583 if (token
== Opt_noquota
&& sb_any_quota_loaded(sb
)) {
1584 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1585 "options when quota turned on");
1589 if (m
->flags
& MOPT_NOSUPPORT
) {
1590 ext4_msg(sb
, KERN_ERR
, "%s option not supported", opt
);
1591 } else if (token
== Opt_commit
) {
1593 arg
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1594 sbi
->s_commit_interval
= HZ
* arg
;
1595 } else if (token
== Opt_max_batch_time
) {
1597 arg
= EXT4_DEF_MAX_BATCH_TIME
;
1598 sbi
->s_max_batch_time
= arg
;
1599 } else if (token
== Opt_min_batch_time
) {
1600 sbi
->s_min_batch_time
= arg
;
1601 } else if (token
== Opt_inode_readahead_blks
) {
1602 if (arg
> (1 << 30))
1604 if (arg
&& !is_power_of_2(arg
)) {
1605 ext4_msg(sb
, KERN_ERR
,
1606 "EXT4-fs: inode_readahead_blks"
1607 " must be a power of 2");
1610 sbi
->s_inode_readahead_blks
= arg
;
1611 } else if (token
== Opt_init_itable
) {
1612 set_opt(sb
, INIT_INODE_TABLE
);
1614 arg
= EXT4_DEF_LI_WAIT_MULT
;
1615 sbi
->s_li_wait_mult
= arg
;
1616 } else if (token
== Opt_stripe
) {
1617 sbi
->s_stripe
= arg
;
1618 } else if (m
->flags
& MOPT_DATAJ
) {
1620 if (!sbi
->s_journal
)
1621 ext4_msg(sb
, KERN_WARNING
, "Remounting file system with no journal so ignoring journalled data option");
1622 else if (test_opt(sb
, DATA_FLAGS
) !=
1624 ext4_msg(sb
, KERN_ERR
,
1625 "Cannot change data mode on remount");
1629 clear_opt(sb
, DATA_FLAGS
);
1630 sbi
->s_mount_opt
|= m
->mount_opt
;
1633 } else if (m
->flags
& MOPT_QFMT
) {
1634 if (sb_any_quota_loaded(sb
) &&
1635 sbi
->s_jquota_fmt
!= m
->mount_opt
) {
1636 ext4_msg(sb
, KERN_ERR
, "Cannot "
1637 "change journaled quota options "
1638 "when quota turned on");
1641 sbi
->s_jquota_fmt
= m
->mount_opt
;
1646 if (m
->flags
& MOPT_CLEAR
)
1648 else if (unlikely(!(m
->flags
& MOPT_SET
))) {
1649 ext4_msg(sb
, KERN_WARNING
,
1650 "buggy handling of option %s", opt
);
1655 sbi
->s_mount_opt
|= m
->mount_opt
;
1657 sbi
->s_mount_opt
&= ~m
->mount_opt
;
1661 ext4_msg(sb
, KERN_ERR
, "Unrecognized mount option \"%s\" "
1662 "or missing value", opt
);
1666 static int parse_options(char *options
, struct super_block
*sb
,
1667 unsigned long *journal_devnum
,
1668 unsigned int *journal_ioprio
,
1672 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1675 substring_t args
[MAX_OPT_ARGS
];
1681 while ((p
= strsep(&options
, ",")) != NULL
) {
1685 * Initialize args struct so we know whether arg was
1686 * found; some options take optional arguments.
1688 args
[0].to
= args
[0].from
= 0;
1689 token
= match_token(p
, tokens
, args
);
1690 if (handle_mount_opt(sb
, p
, token
, args
, journal_devnum
,
1691 journal_ioprio
, is_remount
) < 0)
1695 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1696 if (test_opt(sb
, USRQUOTA
) && sbi
->s_qf_names
[USRQUOTA
])
1697 clear_opt(sb
, USRQUOTA
);
1699 if (test_opt(sb
, GRPQUOTA
) && sbi
->s_qf_names
[GRPQUOTA
])
1700 clear_opt(sb
, GRPQUOTA
);
1702 if (test_opt(sb
, GRPQUOTA
) || test_opt(sb
, USRQUOTA
)) {
1703 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1708 if (!sbi
->s_jquota_fmt
) {
1709 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1714 if (sbi
->s_jquota_fmt
) {
1715 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1716 "specified with no journaling "
1725 static inline void ext4_show_quota_options(struct seq_file
*seq
,
1726 struct super_block
*sb
)
1728 #if defined(CONFIG_QUOTA)
1729 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1731 if (sbi
->s_jquota_fmt
) {
1734 switch (sbi
->s_jquota_fmt
) {
1745 seq_printf(seq
, ",jqfmt=%s", fmtname
);
1748 if (sbi
->s_qf_names
[USRQUOTA
])
1749 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
1751 if (sbi
->s_qf_names
[GRPQUOTA
])
1752 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
1754 if (test_opt(sb
, USRQUOTA
))
1755 seq_puts(seq
, ",usrquota");
1757 if (test_opt(sb
, GRPQUOTA
))
1758 seq_puts(seq
, ",grpquota");
1762 static const char *token2str(int token
)
1764 static const struct match_token
*t
;
1766 for (t
= tokens
; t
->token
!= Opt_err
; t
++)
1767 if (t
->token
== token
&& !strchr(t
->pattern
, '='))
1774 * - it's set to a non-default value OR
1775 * - if the per-sb default is different from the global default
1777 static int _ext4_show_options(struct seq_file
*seq
, struct super_block
*sb
,
1780 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1781 struct ext4_super_block
*es
= sbi
->s_es
;
1782 int def_errors
, def_mount_opt
= nodefs
? 0 : sbi
->s_def_mount_opt
;
1783 const struct mount_opts
*m
;
1784 char sep
= nodefs
? '\n' : ',';
1786 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1787 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1789 if (sbi
->s_sb_block
!= 1)
1790 SEQ_OPTS_PRINT("sb=%llu", sbi
->s_sb_block
);
1792 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++) {
1793 int want_set
= m
->flags
& MOPT_SET
;
1794 if (((m
->flags
& (MOPT_SET
|MOPT_CLEAR
)) == 0) ||
1795 (m
->flags
& MOPT_CLEAR_ERR
))
1797 if (!(m
->mount_opt
& (sbi
->s_mount_opt
^ def_mount_opt
)))
1798 continue; /* skip if same as the default */
1800 (sbi
->s_mount_opt
& m
->mount_opt
) != m
->mount_opt
) ||
1801 (!want_set
&& (sbi
->s_mount_opt
& m
->mount_opt
)))
1802 continue; /* select Opt_noFoo vs Opt_Foo */
1803 SEQ_OPTS_PRINT("%s", token2str(m
->token
));
1806 if (nodefs
|| !uid_eq(sbi
->s_resuid
, make_kuid(&init_user_ns
, EXT4_DEF_RESUID
)) ||
1807 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
)
1808 SEQ_OPTS_PRINT("resuid=%u",
1809 from_kuid_munged(&init_user_ns
, sbi
->s_resuid
));
1810 if (nodefs
|| !gid_eq(sbi
->s_resgid
, make_kgid(&init_user_ns
, EXT4_DEF_RESGID
)) ||
1811 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
)
1812 SEQ_OPTS_PRINT("resgid=%u",
1813 from_kgid_munged(&init_user_ns
, sbi
->s_resgid
));
1814 def_errors
= nodefs
? -1 : le16_to_cpu(es
->s_errors
);
1815 if (test_opt(sb
, ERRORS_RO
) && def_errors
!= EXT4_ERRORS_RO
)
1816 SEQ_OPTS_PUTS("errors=remount-ro");
1817 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
1818 SEQ_OPTS_PUTS("errors=continue");
1819 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
1820 SEQ_OPTS_PUTS("errors=panic");
1821 if (nodefs
|| sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
)
1822 SEQ_OPTS_PRINT("commit=%lu", sbi
->s_commit_interval
/ HZ
);
1823 if (nodefs
|| sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
)
1824 SEQ_OPTS_PRINT("min_batch_time=%u", sbi
->s_min_batch_time
);
1825 if (nodefs
|| sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
)
1826 SEQ_OPTS_PRINT("max_batch_time=%u", sbi
->s_max_batch_time
);
1827 if (sb
->s_flags
& MS_I_VERSION
)
1828 SEQ_OPTS_PUTS("i_version");
1829 if (nodefs
|| sbi
->s_stripe
)
1830 SEQ_OPTS_PRINT("stripe=%lu", sbi
->s_stripe
);
1831 if (EXT4_MOUNT_DATA_FLAGS
& (sbi
->s_mount_opt
^ def_mount_opt
)) {
1832 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
1833 SEQ_OPTS_PUTS("data=journal");
1834 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
1835 SEQ_OPTS_PUTS("data=ordered");
1836 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
1837 SEQ_OPTS_PUTS("data=writeback");
1840 sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
1841 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1842 sbi
->s_inode_readahead_blks
);
1844 if (nodefs
|| (test_opt(sb
, INIT_INODE_TABLE
) &&
1845 (sbi
->s_li_wait_mult
!= EXT4_DEF_LI_WAIT_MULT
)))
1846 SEQ_OPTS_PRINT("init_itable=%u", sbi
->s_li_wait_mult
);
1848 ext4_show_quota_options(seq
, sb
);
1852 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
)
1854 return _ext4_show_options(seq
, root
->d_sb
, 0);
1857 static int options_seq_show(struct seq_file
*seq
, void *offset
)
1859 struct super_block
*sb
= seq
->private;
1862 seq_puts(seq
, (sb
->s_flags
& MS_RDONLY
) ? "ro" : "rw");
1863 rc
= _ext4_show_options(seq
, sb
, 1);
1864 seq_puts(seq
, "\n");
1868 static int options_open_fs(struct inode
*inode
, struct file
*file
)
1870 return single_open(file
, options_seq_show
, PDE(inode
)->data
);
1873 static const struct file_operations ext4_seq_options_fops
= {
1874 .owner
= THIS_MODULE
,
1875 .open
= options_open_fs
,
1877 .llseek
= seq_lseek
,
1878 .release
= single_release
,
1881 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1884 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1887 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1888 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
1889 "forcing read-only mode");
1894 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1895 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
1896 "running e2fsck is recommended");
1897 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1898 ext4_msg(sb
, KERN_WARNING
,
1899 "warning: mounting fs with errors, "
1900 "running e2fsck is recommended");
1901 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) > 0 &&
1902 le16_to_cpu(es
->s_mnt_count
) >=
1903 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1904 ext4_msg(sb
, KERN_WARNING
,
1905 "warning: maximal mount count reached, "
1906 "running e2fsck is recommended");
1907 else if (le32_to_cpu(es
->s_checkinterval
) &&
1908 (le32_to_cpu(es
->s_lastcheck
) +
1909 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1910 ext4_msg(sb
, KERN_WARNING
,
1911 "warning: checktime reached, "
1912 "running e2fsck is recommended");
1913 if (!sbi
->s_journal
)
1914 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1915 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1916 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1917 le16_add_cpu(&es
->s_mnt_count
, 1);
1918 es
->s_mtime
= cpu_to_le32(get_seconds());
1919 ext4_update_dynamic_rev(sb
);
1921 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1923 ext4_commit_super(sb
, 1);
1925 if (test_opt(sb
, DEBUG
))
1926 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
1927 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1929 sbi
->s_groups_count
,
1930 EXT4_BLOCKS_PER_GROUP(sb
),
1931 EXT4_INODES_PER_GROUP(sb
),
1932 sbi
->s_mount_opt
, sbi
->s_mount_opt2
);
1934 cleancache_init_fs(sb
);
1938 static int ext4_fill_flex_info(struct super_block
*sb
)
1940 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1941 struct ext4_group_desc
*gdp
= NULL
;
1942 ext4_group_t flex_group_count
;
1943 ext4_group_t flex_group
;
1944 unsigned int groups_per_flex
= 0;
1948 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1949 if (sbi
->s_log_groups_per_flex
< 1 || sbi
->s_log_groups_per_flex
> 31) {
1950 sbi
->s_log_groups_per_flex
= 0;
1953 groups_per_flex
= 1 << sbi
->s_log_groups_per_flex
;
1955 /* We allocate both existing and potentially added groups */
1956 flex_group_count
= ((sbi
->s_groups_count
+ groups_per_flex
- 1) +
1957 ((le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
) + 1) <<
1958 EXT4_DESC_PER_BLOCK_BITS(sb
))) / groups_per_flex
;
1959 size
= flex_group_count
* sizeof(struct flex_groups
);
1960 sbi
->s_flex_groups
= ext4_kvzalloc(size
, GFP_KERNEL
);
1961 if (sbi
->s_flex_groups
== NULL
) {
1962 ext4_msg(sb
, KERN_ERR
, "not enough memory for %u flex groups",
1967 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1968 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1970 flex_group
= ext4_flex_group(sbi
, i
);
1971 atomic_add(ext4_free_inodes_count(sb
, gdp
),
1972 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
1973 atomic_add(ext4_free_group_clusters(sb
, gdp
),
1974 &sbi
->s_flex_groups
[flex_group
].free_clusters
);
1975 atomic_add(ext4_used_dirs_count(sb
, gdp
),
1976 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
1984 static __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
1985 struct ext4_group_desc
*gdp
)
1989 __le32 le_group
= cpu_to_le32(block_group
);
1991 if ((sbi
->s_es
->s_feature_ro_compat
&
1992 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))) {
1993 /* Use new metadata_csum algorithm */
1997 old_csum
= gdp
->bg_checksum
;
1998 gdp
->bg_checksum
= 0;
1999 csum32
= ext4_chksum(sbi
, sbi
->s_csum_seed
, (__u8
*)&le_group
,
2001 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)gdp
,
2003 gdp
->bg_checksum
= old_csum
;
2005 crc
= csum32
& 0xFFFF;
2009 /* old crc16 code */
2010 offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
2012 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
2013 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
2014 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
2015 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
2016 /* for checksum of struct ext4_group_desc do the rest...*/
2017 if ((sbi
->s_es
->s_feature_incompat
&
2018 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
2019 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
2020 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
2021 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
2025 return cpu_to_le16(crc
);
2028 int ext4_group_desc_csum_verify(struct super_block
*sb
, __u32 block_group
,
2029 struct ext4_group_desc
*gdp
)
2031 if (ext4_has_group_desc_csum(sb
) &&
2032 (gdp
->bg_checksum
!= ext4_group_desc_csum(EXT4_SB(sb
),
2039 void ext4_group_desc_csum_set(struct super_block
*sb
, __u32 block_group
,
2040 struct ext4_group_desc
*gdp
)
2042 if (!ext4_has_group_desc_csum(sb
))
2044 gdp
->bg_checksum
= ext4_group_desc_csum(EXT4_SB(sb
), block_group
, gdp
);
2047 /* Called at mount-time, super-block is locked */
2048 static int ext4_check_descriptors(struct super_block
*sb
,
2049 ext4_group_t
*first_not_zeroed
)
2051 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2052 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
2053 ext4_fsblk_t last_block
;
2054 ext4_fsblk_t block_bitmap
;
2055 ext4_fsblk_t inode_bitmap
;
2056 ext4_fsblk_t inode_table
;
2057 int flexbg_flag
= 0;
2058 ext4_group_t i
, grp
= sbi
->s_groups_count
;
2060 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
2063 ext4_debug("Checking group descriptors");
2065 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
2066 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2068 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
2069 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
2071 last_block
= first_block
+
2072 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2074 if ((grp
== sbi
->s_groups_count
) &&
2075 !(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2078 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
2079 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
2080 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2081 "Block bitmap for group %u not in group "
2082 "(block %llu)!", i
, block_bitmap
);
2085 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
2086 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
2087 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2088 "Inode bitmap for group %u not in group "
2089 "(block %llu)!", i
, inode_bitmap
);
2092 inode_table
= ext4_inode_table(sb
, gdp
);
2093 if (inode_table
< first_block
||
2094 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
2095 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2096 "Inode table for group %u not in group "
2097 "(block %llu)!", i
, inode_table
);
2100 ext4_lock_group(sb
, i
);
2101 if (!ext4_group_desc_csum_verify(sb
, i
, gdp
)) {
2102 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2103 "Checksum for group %u failed (%u!=%u)",
2104 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
2105 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
2106 if (!(sb
->s_flags
& MS_RDONLY
)) {
2107 ext4_unlock_group(sb
, i
);
2111 ext4_unlock_group(sb
, i
);
2113 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
2115 if (NULL
!= first_not_zeroed
)
2116 *first_not_zeroed
= grp
;
2118 ext4_free_blocks_count_set(sbi
->s_es
,
2119 EXT4_C2B(sbi
, ext4_count_free_clusters(sb
)));
2120 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
2124 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2125 * the superblock) which were deleted from all directories, but held open by
2126 * a process at the time of a crash. We walk the list and try to delete these
2127 * inodes at recovery time (only with a read-write filesystem).
2129 * In order to keep the orphan inode chain consistent during traversal (in
2130 * case of crash during recovery), we link each inode into the superblock
2131 * orphan list_head and handle it the same way as an inode deletion during
2132 * normal operation (which journals the operations for us).
2134 * We only do an iget() and an iput() on each inode, which is very safe if we
2135 * accidentally point at an in-use or already deleted inode. The worst that
2136 * can happen in this case is that we get a "bit already cleared" message from
2137 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2138 * e2fsck was run on this filesystem, and it must have already done the orphan
2139 * inode cleanup for us, so we can safely abort without any further action.
2141 static void ext4_orphan_cleanup(struct super_block
*sb
,
2142 struct ext4_super_block
*es
)
2144 unsigned int s_flags
= sb
->s_flags
;
2145 int nr_orphans
= 0, nr_truncates
= 0;
2149 if (!es
->s_last_orphan
) {
2150 jbd_debug(4, "no orphan inodes to clean up\n");
2154 if (bdev_read_only(sb
->s_bdev
)) {
2155 ext4_msg(sb
, KERN_ERR
, "write access "
2156 "unavailable, skipping orphan cleanup");
2160 /* Check if feature set would not allow a r/w mount */
2161 if (!ext4_feature_set_ok(sb
, 0)) {
2162 ext4_msg(sb
, KERN_INFO
, "Skipping orphan cleanup due to "
2163 "unknown ROCOMPAT features");
2167 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2168 if (es
->s_last_orphan
)
2169 jbd_debug(1, "Errors on filesystem, "
2170 "clearing orphan list.\n");
2171 es
->s_last_orphan
= 0;
2172 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2176 if (s_flags
& MS_RDONLY
) {
2177 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
2178 sb
->s_flags
&= ~MS_RDONLY
;
2181 /* Needed for iput() to work correctly and not trash data */
2182 sb
->s_flags
|= MS_ACTIVE
;
2183 /* Turn on quotas so that they are updated correctly */
2184 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2185 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
2186 int ret
= ext4_quota_on_mount(sb
, i
);
2188 ext4_msg(sb
, KERN_ERR
,
2189 "Cannot turn on journaled "
2190 "quota: error %d", ret
);
2195 while (es
->s_last_orphan
) {
2196 struct inode
*inode
;
2198 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
2199 if (IS_ERR(inode
)) {
2200 es
->s_last_orphan
= 0;
2204 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
2205 dquot_initialize(inode
);
2206 if (inode
->i_nlink
) {
2207 ext4_msg(sb
, KERN_DEBUG
,
2208 "%s: truncating inode %lu to %lld bytes",
2209 __func__
, inode
->i_ino
, inode
->i_size
);
2210 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2211 inode
->i_ino
, inode
->i_size
);
2212 ext4_truncate(inode
);
2215 ext4_msg(sb
, KERN_DEBUG
,
2216 "%s: deleting unreferenced inode %lu",
2217 __func__
, inode
->i_ino
);
2218 jbd_debug(2, "deleting unreferenced inode %lu\n",
2222 iput(inode
); /* The delete magic happens here! */
2225 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2228 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
2229 PLURAL(nr_orphans
));
2231 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
2232 PLURAL(nr_truncates
));
2234 /* Turn quotas off */
2235 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2236 if (sb_dqopt(sb
)->files
[i
])
2237 dquot_quota_off(sb
, i
);
2240 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
2244 * Maximal extent format file size.
2245 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2246 * extent format containers, within a sector_t, and within i_blocks
2247 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2248 * so that won't be a limiting factor.
2250 * However there is other limiting factor. We do store extents in the form
2251 * of starting block and length, hence the resulting length of the extent
2252 * covering maximum file size must fit into on-disk format containers as
2253 * well. Given that length is always by 1 unit bigger than max unit (because
2254 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2256 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2258 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
2261 loff_t upper_limit
= MAX_LFS_FILESIZE
;
2263 /* small i_blocks in vfs inode? */
2264 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2266 * CONFIG_LBDAF is not enabled implies the inode
2267 * i_block represent total blocks in 512 bytes
2268 * 32 == size of vfs inode i_blocks * 8
2270 upper_limit
= (1LL << 32) - 1;
2272 /* total blocks in file system block size */
2273 upper_limit
>>= (blkbits
- 9);
2274 upper_limit
<<= blkbits
;
2278 * 32-bit extent-start container, ee_block. We lower the maxbytes
2279 * by one fs block, so ee_len can cover the extent of maximum file
2282 res
= (1LL << 32) - 1;
2285 /* Sanity check against vm- & vfs- imposed limits */
2286 if (res
> upper_limit
)
2293 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2294 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2295 * We need to be 1 filesystem block less than the 2^48 sector limit.
2297 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2299 loff_t res
= EXT4_NDIR_BLOCKS
;
2302 /* This is calculated to be the largest file size for a dense, block
2303 * mapped file such that the file's total number of 512-byte sectors,
2304 * including data and all indirect blocks, does not exceed (2^48 - 1).
2306 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2307 * number of 512-byte sectors of the file.
2310 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2312 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2313 * the inode i_block field represents total file blocks in
2314 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2316 upper_limit
= (1LL << 32) - 1;
2318 /* total blocks in file system block size */
2319 upper_limit
>>= (bits
- 9);
2323 * We use 48 bit ext4_inode i_blocks
2324 * With EXT4_HUGE_FILE_FL set the i_blocks
2325 * represent total number of blocks in
2326 * file system block size
2328 upper_limit
= (1LL << 48) - 1;
2332 /* indirect blocks */
2334 /* double indirect blocks */
2335 meta_blocks
+= 1 + (1LL << (bits
-2));
2336 /* tripple indirect blocks */
2337 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2339 upper_limit
-= meta_blocks
;
2340 upper_limit
<<= bits
;
2342 res
+= 1LL << (bits
-2);
2343 res
+= 1LL << (2*(bits
-2));
2344 res
+= 1LL << (3*(bits
-2));
2346 if (res
> upper_limit
)
2349 if (res
> MAX_LFS_FILESIZE
)
2350 res
= MAX_LFS_FILESIZE
;
2355 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2356 ext4_fsblk_t logical_sb_block
, int nr
)
2358 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2359 ext4_group_t bg
, first_meta_bg
;
2362 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2364 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
2366 return logical_sb_block
+ nr
+ 1;
2367 bg
= sbi
->s_desc_per_block
* nr
;
2368 if (ext4_bg_has_super(sb
, bg
))
2371 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2375 * ext4_get_stripe_size: Get the stripe size.
2376 * @sbi: In memory super block info
2378 * If we have specified it via mount option, then
2379 * use the mount option value. If the value specified at mount time is
2380 * greater than the blocks per group use the super block value.
2381 * If the super block value is greater than blocks per group return 0.
2382 * Allocator needs it be less than blocks per group.
2385 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2387 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2388 unsigned long stripe_width
=
2389 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2392 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2393 ret
= sbi
->s_stripe
;
2394 else if (stripe_width
<= sbi
->s_blocks_per_group
)
2396 else if (stride
<= sbi
->s_blocks_per_group
)
2402 * If the stripe width is 1, this makes no sense and
2403 * we set it to 0 to turn off stripe handling code.
2414 struct attribute attr
;
2415 ssize_t (*show
)(struct ext4_attr
*, struct ext4_sb_info
*, char *);
2416 ssize_t (*store
)(struct ext4_attr
*, struct ext4_sb_info
*,
2417 const char *, size_t);
2421 static int parse_strtoul(const char *buf
,
2422 unsigned long max
, unsigned long *value
)
2426 *value
= simple_strtoul(skip_spaces(buf
), &endp
, 0);
2427 endp
= skip_spaces(endp
);
2428 if (*endp
|| *value
> max
)
2434 static ssize_t
delayed_allocation_blocks_show(struct ext4_attr
*a
,
2435 struct ext4_sb_info
*sbi
,
2438 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2440 percpu_counter_sum(&sbi
->s_dirtyclusters_counter
)));
2443 static ssize_t
session_write_kbytes_show(struct ext4_attr
*a
,
2444 struct ext4_sb_info
*sbi
, char *buf
)
2446 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2448 if (!sb
->s_bdev
->bd_part
)
2449 return snprintf(buf
, PAGE_SIZE
, "0\n");
2450 return snprintf(buf
, PAGE_SIZE
, "%lu\n",
2451 (part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2452 sbi
->s_sectors_written_start
) >> 1);
2455 static ssize_t
lifetime_write_kbytes_show(struct ext4_attr
*a
,
2456 struct ext4_sb_info
*sbi
, char *buf
)
2458 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2460 if (!sb
->s_bdev
->bd_part
)
2461 return snprintf(buf
, PAGE_SIZE
, "0\n");
2462 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2463 (unsigned long long)(sbi
->s_kbytes_written
+
2464 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2465 EXT4_SB(sb
)->s_sectors_written_start
) >> 1)));
2468 static ssize_t
inode_readahead_blks_store(struct ext4_attr
*a
,
2469 struct ext4_sb_info
*sbi
,
2470 const char *buf
, size_t count
)
2474 if (parse_strtoul(buf
, 0x40000000, &t
))
2477 if (t
&& !is_power_of_2(t
))
2480 sbi
->s_inode_readahead_blks
= t
;
2484 static ssize_t
sbi_ui_show(struct ext4_attr
*a
,
2485 struct ext4_sb_info
*sbi
, char *buf
)
2487 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2489 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
2492 static ssize_t
sbi_ui_store(struct ext4_attr
*a
,
2493 struct ext4_sb_info
*sbi
,
2494 const char *buf
, size_t count
)
2496 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2499 if (parse_strtoul(buf
, 0xffffffff, &t
))
2505 static ssize_t
trigger_test_error(struct ext4_attr
*a
,
2506 struct ext4_sb_info
*sbi
,
2507 const char *buf
, size_t count
)
2511 if (!capable(CAP_SYS_ADMIN
))
2514 if (len
&& buf
[len
-1] == '\n')
2518 ext4_error(sbi
->s_sb
, "%.*s", len
, buf
);
2522 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2523 static struct ext4_attr ext4_attr_##_name = { \
2524 .attr = {.name = __stringify(_name), .mode = _mode }, \
2527 .offset = offsetof(struct ext4_sb_info, _elname), \
2529 #define EXT4_ATTR(name, mode, show, store) \
2530 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2532 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2533 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2534 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2535 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2536 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2537 #define ATTR_LIST(name) &ext4_attr_##name.attr
2539 EXT4_RO_ATTR(delayed_allocation_blocks
);
2540 EXT4_RO_ATTR(session_write_kbytes
);
2541 EXT4_RO_ATTR(lifetime_write_kbytes
);
2542 EXT4_ATTR_OFFSET(inode_readahead_blks
, 0644, sbi_ui_show
,
2543 inode_readahead_blks_store
, s_inode_readahead_blks
);
2544 EXT4_RW_ATTR_SBI_UI(inode_goal
, s_inode_goal
);
2545 EXT4_RW_ATTR_SBI_UI(mb_stats
, s_mb_stats
);
2546 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan
, s_mb_max_to_scan
);
2547 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan
, s_mb_min_to_scan
);
2548 EXT4_RW_ATTR_SBI_UI(mb_order2_req
, s_mb_order2_reqs
);
2549 EXT4_RW_ATTR_SBI_UI(mb_stream_req
, s_mb_stream_request
);
2550 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc
, s_mb_group_prealloc
);
2551 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump
, s_max_writeback_mb_bump
);
2552 EXT4_ATTR(trigger_fs_error
, 0200, NULL
, trigger_test_error
);
2554 static struct attribute
*ext4_attrs
[] = {
2555 ATTR_LIST(delayed_allocation_blocks
),
2556 ATTR_LIST(session_write_kbytes
),
2557 ATTR_LIST(lifetime_write_kbytes
),
2558 ATTR_LIST(inode_readahead_blks
),
2559 ATTR_LIST(inode_goal
),
2560 ATTR_LIST(mb_stats
),
2561 ATTR_LIST(mb_max_to_scan
),
2562 ATTR_LIST(mb_min_to_scan
),
2563 ATTR_LIST(mb_order2_req
),
2564 ATTR_LIST(mb_stream_req
),
2565 ATTR_LIST(mb_group_prealloc
),
2566 ATTR_LIST(max_writeback_mb_bump
),
2567 ATTR_LIST(trigger_fs_error
),
2571 /* Features this copy of ext4 supports */
2572 EXT4_INFO_ATTR(lazy_itable_init
);
2573 EXT4_INFO_ATTR(batched_discard
);
2575 static struct attribute
*ext4_feat_attrs
[] = {
2576 ATTR_LIST(lazy_itable_init
),
2577 ATTR_LIST(batched_discard
),
2581 static ssize_t
ext4_attr_show(struct kobject
*kobj
,
2582 struct attribute
*attr
, char *buf
)
2584 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2586 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2588 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
2591 static ssize_t
ext4_attr_store(struct kobject
*kobj
,
2592 struct attribute
*attr
,
2593 const char *buf
, size_t len
)
2595 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2597 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2599 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
2602 static void ext4_sb_release(struct kobject
*kobj
)
2604 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2606 complete(&sbi
->s_kobj_unregister
);
2609 static const struct sysfs_ops ext4_attr_ops
= {
2610 .show
= ext4_attr_show
,
2611 .store
= ext4_attr_store
,
2614 static struct kobj_type ext4_ktype
= {
2615 .default_attrs
= ext4_attrs
,
2616 .sysfs_ops
= &ext4_attr_ops
,
2617 .release
= ext4_sb_release
,
2620 static void ext4_feat_release(struct kobject
*kobj
)
2622 complete(&ext4_feat
->f_kobj_unregister
);
2625 static struct kobj_type ext4_feat_ktype
= {
2626 .default_attrs
= ext4_feat_attrs
,
2627 .sysfs_ops
= &ext4_attr_ops
,
2628 .release
= ext4_feat_release
,
2632 * Check whether this filesystem can be mounted based on
2633 * the features present and the RDONLY/RDWR mount requested.
2634 * Returns 1 if this filesystem can be mounted as requested,
2635 * 0 if it cannot be.
2637 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2639 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
)) {
2640 ext4_msg(sb
, KERN_ERR
,
2641 "Couldn't mount because of "
2642 "unsupported optional features (%x)",
2643 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2644 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2651 /* Check that feature set is OK for a read-write mount */
2652 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
)) {
2653 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2654 "unsupported optional features (%x)",
2655 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2656 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2660 * Large file size enabled file system can only be mounted
2661 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2663 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
2664 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2665 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2666 "cannot be mounted RDWR without "
2671 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_BIGALLOC
) &&
2672 !EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_EXTENTS
)) {
2673 ext4_msg(sb
, KERN_ERR
,
2674 "Can't support bigalloc feature without "
2675 "extents feature\n");
2679 #ifndef CONFIG_QUOTA
2680 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
) &&
2682 ext4_msg(sb
, KERN_ERR
,
2683 "Filesystem with quota feature cannot be mounted RDWR "
2684 "without CONFIG_QUOTA");
2687 #endif /* CONFIG_QUOTA */
2692 * This function is called once a day if we have errors logged
2693 * on the file system
2695 static void print_daily_error_info(unsigned long arg
)
2697 struct super_block
*sb
= (struct super_block
*) arg
;
2698 struct ext4_sb_info
*sbi
;
2699 struct ext4_super_block
*es
;
2704 if (es
->s_error_count
)
2705 ext4_msg(sb
, KERN_NOTICE
, "error count: %u",
2706 le32_to_cpu(es
->s_error_count
));
2707 if (es
->s_first_error_time
) {
2708 printk(KERN_NOTICE
"EXT4-fs (%s): initial error at %u: %.*s:%d",
2709 sb
->s_id
, le32_to_cpu(es
->s_first_error_time
),
2710 (int) sizeof(es
->s_first_error_func
),
2711 es
->s_first_error_func
,
2712 le32_to_cpu(es
->s_first_error_line
));
2713 if (es
->s_first_error_ino
)
2714 printk(": inode %u",
2715 le32_to_cpu(es
->s_first_error_ino
));
2716 if (es
->s_first_error_block
)
2717 printk(": block %llu", (unsigned long long)
2718 le64_to_cpu(es
->s_first_error_block
));
2721 if (es
->s_last_error_time
) {
2722 printk(KERN_NOTICE
"EXT4-fs (%s): last error at %u: %.*s:%d",
2723 sb
->s_id
, le32_to_cpu(es
->s_last_error_time
),
2724 (int) sizeof(es
->s_last_error_func
),
2725 es
->s_last_error_func
,
2726 le32_to_cpu(es
->s_last_error_line
));
2727 if (es
->s_last_error_ino
)
2728 printk(": inode %u",
2729 le32_to_cpu(es
->s_last_error_ino
));
2730 if (es
->s_last_error_block
)
2731 printk(": block %llu", (unsigned long long)
2732 le64_to_cpu(es
->s_last_error_block
));
2735 mod_timer(&sbi
->s_err_report
, jiffies
+ 24*60*60*HZ
); /* Once a day */
2738 /* Find next suitable group and run ext4_init_inode_table */
2739 static int ext4_run_li_request(struct ext4_li_request
*elr
)
2741 struct ext4_group_desc
*gdp
= NULL
;
2742 ext4_group_t group
, ngroups
;
2743 struct super_block
*sb
;
2744 unsigned long timeout
= 0;
2748 ngroups
= EXT4_SB(sb
)->s_groups_count
;
2750 for (group
= elr
->lr_next_group
; group
< ngroups
; group
++) {
2751 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2757 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2761 if (group
== ngroups
)
2766 ret
= ext4_init_inode_table(sb
, group
,
2767 elr
->lr_timeout
? 0 : 1);
2768 if (elr
->lr_timeout
== 0) {
2769 timeout
= (jiffies
- timeout
) *
2770 elr
->lr_sbi
->s_li_wait_mult
;
2771 elr
->lr_timeout
= timeout
;
2773 elr
->lr_next_sched
= jiffies
+ elr
->lr_timeout
;
2774 elr
->lr_next_group
= group
+ 1;
2781 * Remove lr_request from the list_request and free the
2782 * request structure. Should be called with li_list_mtx held
2784 static void ext4_remove_li_request(struct ext4_li_request
*elr
)
2786 struct ext4_sb_info
*sbi
;
2793 list_del(&elr
->lr_request
);
2794 sbi
->s_li_request
= NULL
;
2798 static void ext4_unregister_li_request(struct super_block
*sb
)
2800 mutex_lock(&ext4_li_mtx
);
2801 if (!ext4_li_info
) {
2802 mutex_unlock(&ext4_li_mtx
);
2806 mutex_lock(&ext4_li_info
->li_list_mtx
);
2807 ext4_remove_li_request(EXT4_SB(sb
)->s_li_request
);
2808 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2809 mutex_unlock(&ext4_li_mtx
);
2812 static struct task_struct
*ext4_lazyinit_task
;
2815 * This is the function where ext4lazyinit thread lives. It walks
2816 * through the request list searching for next scheduled filesystem.
2817 * When such a fs is found, run the lazy initialization request
2818 * (ext4_rn_li_request) and keep track of the time spend in this
2819 * function. Based on that time we compute next schedule time of
2820 * the request. When walking through the list is complete, compute
2821 * next waking time and put itself into sleep.
2823 static int ext4_lazyinit_thread(void *arg
)
2825 struct ext4_lazy_init
*eli
= (struct ext4_lazy_init
*)arg
;
2826 struct list_head
*pos
, *n
;
2827 struct ext4_li_request
*elr
;
2828 unsigned long next_wakeup
, cur
;
2830 BUG_ON(NULL
== eli
);
2834 next_wakeup
= MAX_JIFFY_OFFSET
;
2836 mutex_lock(&eli
->li_list_mtx
);
2837 if (list_empty(&eli
->li_request_list
)) {
2838 mutex_unlock(&eli
->li_list_mtx
);
2842 list_for_each_safe(pos
, n
, &eli
->li_request_list
) {
2843 elr
= list_entry(pos
, struct ext4_li_request
,
2846 if (time_after_eq(jiffies
, elr
->lr_next_sched
)) {
2847 if (ext4_run_li_request(elr
) != 0) {
2848 /* error, remove the lazy_init job */
2849 ext4_remove_li_request(elr
);
2854 if (time_before(elr
->lr_next_sched
, next_wakeup
))
2855 next_wakeup
= elr
->lr_next_sched
;
2857 mutex_unlock(&eli
->li_list_mtx
);
2862 if ((time_after_eq(cur
, next_wakeup
)) ||
2863 (MAX_JIFFY_OFFSET
== next_wakeup
)) {
2868 schedule_timeout_interruptible(next_wakeup
- cur
);
2870 if (kthread_should_stop()) {
2871 ext4_clear_request_list();
2878 * It looks like the request list is empty, but we need
2879 * to check it under the li_list_mtx lock, to prevent any
2880 * additions into it, and of course we should lock ext4_li_mtx
2881 * to atomically free the list and ext4_li_info, because at
2882 * this point another ext4 filesystem could be registering
2885 mutex_lock(&ext4_li_mtx
);
2886 mutex_lock(&eli
->li_list_mtx
);
2887 if (!list_empty(&eli
->li_request_list
)) {
2888 mutex_unlock(&eli
->li_list_mtx
);
2889 mutex_unlock(&ext4_li_mtx
);
2892 mutex_unlock(&eli
->li_list_mtx
);
2893 kfree(ext4_li_info
);
2894 ext4_li_info
= NULL
;
2895 mutex_unlock(&ext4_li_mtx
);
2900 static void ext4_clear_request_list(void)
2902 struct list_head
*pos
, *n
;
2903 struct ext4_li_request
*elr
;
2905 mutex_lock(&ext4_li_info
->li_list_mtx
);
2906 list_for_each_safe(pos
, n
, &ext4_li_info
->li_request_list
) {
2907 elr
= list_entry(pos
, struct ext4_li_request
,
2909 ext4_remove_li_request(elr
);
2911 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2914 static int ext4_run_lazyinit_thread(void)
2916 ext4_lazyinit_task
= kthread_run(ext4_lazyinit_thread
,
2917 ext4_li_info
, "ext4lazyinit");
2918 if (IS_ERR(ext4_lazyinit_task
)) {
2919 int err
= PTR_ERR(ext4_lazyinit_task
);
2920 ext4_clear_request_list();
2921 kfree(ext4_li_info
);
2922 ext4_li_info
= NULL
;
2923 printk(KERN_CRIT
"EXT4-fs: error %d creating inode table "
2924 "initialization thread\n",
2928 ext4_li_info
->li_state
|= EXT4_LAZYINIT_RUNNING
;
2933 * Check whether it make sense to run itable init. thread or not.
2934 * If there is at least one uninitialized inode table, return
2935 * corresponding group number, else the loop goes through all
2936 * groups and return total number of groups.
2938 static ext4_group_t
ext4_has_uninit_itable(struct super_block
*sb
)
2940 ext4_group_t group
, ngroups
= EXT4_SB(sb
)->s_groups_count
;
2941 struct ext4_group_desc
*gdp
= NULL
;
2943 for (group
= 0; group
< ngroups
; group
++) {
2944 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2948 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2955 static int ext4_li_info_new(void)
2957 struct ext4_lazy_init
*eli
= NULL
;
2959 eli
= kzalloc(sizeof(*eli
), GFP_KERNEL
);
2963 INIT_LIST_HEAD(&eli
->li_request_list
);
2964 mutex_init(&eli
->li_list_mtx
);
2966 eli
->li_state
|= EXT4_LAZYINIT_QUIT
;
2973 static struct ext4_li_request
*ext4_li_request_new(struct super_block
*sb
,
2976 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2977 struct ext4_li_request
*elr
;
2980 elr
= kzalloc(sizeof(*elr
), GFP_KERNEL
);
2986 elr
->lr_next_group
= start
;
2989 * Randomize first schedule time of the request to
2990 * spread the inode table initialization requests
2993 get_random_bytes(&rnd
, sizeof(rnd
));
2994 elr
->lr_next_sched
= jiffies
+ (unsigned long)rnd
%
2995 (EXT4_DEF_LI_MAX_START_DELAY
* HZ
);
3000 static int ext4_register_li_request(struct super_block
*sb
,
3001 ext4_group_t first_not_zeroed
)
3003 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3004 struct ext4_li_request
*elr
;
3005 ext4_group_t ngroups
= EXT4_SB(sb
)->s_groups_count
;
3008 if (sbi
->s_li_request
!= NULL
) {
3010 * Reset timeout so it can be computed again, because
3011 * s_li_wait_mult might have changed.
3013 sbi
->s_li_request
->lr_timeout
= 0;
3017 if (first_not_zeroed
== ngroups
||
3018 (sb
->s_flags
& MS_RDONLY
) ||
3019 !test_opt(sb
, INIT_INODE_TABLE
))
3022 elr
= ext4_li_request_new(sb
, first_not_zeroed
);
3026 mutex_lock(&ext4_li_mtx
);
3028 if (NULL
== ext4_li_info
) {
3029 ret
= ext4_li_info_new();
3034 mutex_lock(&ext4_li_info
->li_list_mtx
);
3035 list_add(&elr
->lr_request
, &ext4_li_info
->li_request_list
);
3036 mutex_unlock(&ext4_li_info
->li_list_mtx
);
3038 sbi
->s_li_request
= elr
;
3040 * set elr to NULL here since it has been inserted to
3041 * the request_list and the removal and free of it is
3042 * handled by ext4_clear_request_list from now on.
3046 if (!(ext4_li_info
->li_state
& EXT4_LAZYINIT_RUNNING
)) {
3047 ret
= ext4_run_lazyinit_thread();
3052 mutex_unlock(&ext4_li_mtx
);
3059 * We do not need to lock anything since this is called on
3062 static void ext4_destroy_lazyinit_thread(void)
3065 * If thread exited earlier
3066 * there's nothing to be done.
3068 if (!ext4_li_info
|| !ext4_lazyinit_task
)
3071 kthread_stop(ext4_lazyinit_task
);
3074 static int set_journal_csum_feature_set(struct super_block
*sb
)
3077 int compat
, incompat
;
3078 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3080 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3081 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
)) {
3082 /* journal checksum v2 */
3084 incompat
= JBD2_FEATURE_INCOMPAT_CSUM_V2
;
3086 /* journal checksum v1 */
3087 compat
= JBD2_FEATURE_COMPAT_CHECKSUM
;
3091 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
3092 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3094 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
|
3096 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
3097 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3100 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3101 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3103 jbd2_journal_clear_features(sbi
->s_journal
,
3104 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
3105 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
|
3106 JBD2_FEATURE_INCOMPAT_CSUM_V2
);
3113 * Note: calculating the overhead so we can be compatible with
3114 * historical BSD practice is quite difficult in the face of
3115 * clusters/bigalloc. This is because multiple metadata blocks from
3116 * different block group can end up in the same allocation cluster.
3117 * Calculating the exact overhead in the face of clustered allocation
3118 * requires either O(all block bitmaps) in memory or O(number of block
3119 * groups**2) in time. We will still calculate the superblock for
3120 * older file systems --- and if we come across with a bigalloc file
3121 * system with zero in s_overhead_clusters the estimate will be close to
3122 * correct especially for very large cluster sizes --- but for newer
3123 * file systems, it's better to calculate this figure once at mkfs
3124 * time, and store it in the superblock. If the superblock value is
3125 * present (even for non-bigalloc file systems), we will use it.
3127 static int count_overhead(struct super_block
*sb
, ext4_group_t grp
,
3130 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3131 struct ext4_group_desc
*gdp
;
3132 ext4_fsblk_t first_block
, last_block
, b
;
3133 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3134 int s
, j
, count
= 0;
3136 first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
) +
3137 (grp
* EXT4_BLOCKS_PER_GROUP(sb
));
3138 last_block
= first_block
+ EXT4_BLOCKS_PER_GROUP(sb
) - 1;
3139 for (i
= 0; i
< ngroups
; i
++) {
3140 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
3141 b
= ext4_block_bitmap(sb
, gdp
);
3142 if (b
>= first_block
&& b
<= last_block
) {
3143 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3146 b
= ext4_inode_bitmap(sb
, gdp
);
3147 if (b
>= first_block
&& b
<= last_block
) {
3148 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3151 b
= ext4_inode_table(sb
, gdp
);
3152 if (b
>= first_block
&& b
+ sbi
->s_itb_per_group
<= last_block
)
3153 for (j
= 0; j
< sbi
->s_itb_per_group
; j
++, b
++) {
3154 int c
= EXT4_B2C(sbi
, b
- first_block
);
3155 ext4_set_bit(c
, buf
);
3161 if (ext4_bg_has_super(sb
, grp
)) {
3162 ext4_set_bit(s
++, buf
);
3165 for (j
= ext4_bg_num_gdb(sb
, grp
); j
> 0; j
--) {
3166 ext4_set_bit(EXT4_B2C(sbi
, s
++), buf
);
3172 return EXT4_CLUSTERS_PER_GROUP(sb
) -
3173 ext4_count_free(buf
, EXT4_CLUSTERS_PER_GROUP(sb
) / 8);
3177 * Compute the overhead and stash it in sbi->s_overhead
3179 int ext4_calculate_overhead(struct super_block
*sb
)
3181 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3182 struct ext4_super_block
*es
= sbi
->s_es
;
3183 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3184 ext4_fsblk_t overhead
= 0;
3185 char *buf
= (char *) get_zeroed_page(GFP_KERNEL
);
3187 memset(buf
, 0, PAGE_SIZE
);
3192 * Compute the overhead (FS structures). This is constant
3193 * for a given filesystem unless the number of block groups
3194 * changes so we cache the previous value until it does.
3198 * All of the blocks before first_data_block are overhead
3200 overhead
= EXT4_B2C(sbi
, le32_to_cpu(es
->s_first_data_block
));
3203 * Add the overhead found in each block group
3205 for (i
= 0; i
< ngroups
; i
++) {
3208 blks
= count_overhead(sb
, i
, buf
);
3211 memset(buf
, 0, PAGE_SIZE
);
3214 sbi
->s_overhead
= overhead
;
3216 free_page((unsigned long) buf
);
3220 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
3222 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
3223 struct buffer_head
*bh
;
3224 struct ext4_super_block
*es
= NULL
;
3225 struct ext4_sb_info
*sbi
;
3227 ext4_fsblk_t sb_block
= get_sb_block(&data
);
3228 ext4_fsblk_t logical_sb_block
;
3229 unsigned long offset
= 0;
3230 unsigned long journal_devnum
= 0;
3231 unsigned long def_mount_opts
;
3236 int blocksize
, clustersize
;
3237 unsigned int db_count
;
3239 int needs_recovery
, has_huge_files
, has_bigalloc
;
3242 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3243 ext4_group_t first_not_zeroed
;
3245 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
3249 sbi
->s_blockgroup_lock
=
3250 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
3251 if (!sbi
->s_blockgroup_lock
) {
3255 sb
->s_fs_info
= sbi
;
3257 sbi
->s_mount_opt
= 0;
3258 sbi
->s_resuid
= make_kuid(&init_user_ns
, EXT4_DEF_RESUID
);
3259 sbi
->s_resgid
= make_kgid(&init_user_ns
, EXT4_DEF_RESGID
);
3260 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
3261 sbi
->s_sb_block
= sb_block
;
3262 if (sb
->s_bdev
->bd_part
)
3263 sbi
->s_sectors_written_start
=
3264 part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]);
3266 /* Cleanup superblock name */
3267 for (cp
= sb
->s_id
; (cp
= strchr(cp
, '/'));)
3271 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
3273 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
3278 * The ext4 superblock will not be buffer aligned for other than 1kB
3279 * block sizes. We need to calculate the offset from buffer start.
3281 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
3282 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3283 offset
= do_div(logical_sb_block
, blocksize
);
3285 logical_sb_block
= sb_block
;
3288 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
3289 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
3293 * Note: s_es must be initialized as soon as possible because
3294 * some ext4 macro-instructions depend on its value
3296 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
3298 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
3299 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
3301 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
3303 /* Warn if metadata_csum and gdt_csum are both set. */
3304 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3305 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
) &&
3306 EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_GDT_CSUM
))
3307 ext4_warning(sb
, KERN_INFO
"metadata_csum and uninit_bg are "
3308 "redundant flags; please run fsck.");
3310 /* Check for a known checksum algorithm */
3311 if (!ext4_verify_csum_type(sb
, es
)) {
3312 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3313 "unknown checksum algorithm.");
3318 /* Load the checksum driver */
3319 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3320 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
)) {
3321 sbi
->s_chksum_driver
= crypto_alloc_shash("crc32c", 0, 0);
3322 if (IS_ERR(sbi
->s_chksum_driver
)) {
3323 ext4_msg(sb
, KERN_ERR
, "Cannot load crc32c driver.");
3324 ret
= PTR_ERR(sbi
->s_chksum_driver
);
3325 sbi
->s_chksum_driver
= NULL
;
3330 /* Check superblock checksum */
3331 if (!ext4_superblock_csum_verify(sb
, es
)) {
3332 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3333 "invalid superblock checksum. Run e2fsck?");
3338 /* Precompute checksum seed for all metadata */
3339 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3340 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))
3341 sbi
->s_csum_seed
= ext4_chksum(sbi
, ~0, es
->s_uuid
,
3342 sizeof(es
->s_uuid
));
3344 /* Set defaults before we parse the mount options */
3345 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
3346 set_opt(sb
, INIT_INODE_TABLE
);
3347 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
3349 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
3351 if (def_mount_opts
& EXT4_DEFM_UID16
)
3352 set_opt(sb
, NO_UID32
);
3353 /* xattr user namespace & acls are now defaulted on */
3354 #ifdef CONFIG_EXT4_FS_XATTR
3355 set_opt(sb
, XATTR_USER
);
3357 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3358 set_opt(sb
, POSIX_ACL
);
3360 set_opt(sb
, MBLK_IO_SUBMIT
);
3361 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
3362 set_opt(sb
, JOURNAL_DATA
);
3363 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
3364 set_opt(sb
, ORDERED_DATA
);
3365 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
3366 set_opt(sb
, WRITEBACK_DATA
);
3368 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
3369 set_opt(sb
, ERRORS_PANIC
);
3370 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
3371 set_opt(sb
, ERRORS_CONT
);
3373 set_opt(sb
, ERRORS_RO
);
3374 if (def_mount_opts
& EXT4_DEFM_BLOCK_VALIDITY
)
3375 set_opt(sb
, BLOCK_VALIDITY
);
3376 if (def_mount_opts
& EXT4_DEFM_DISCARD
)
3377 set_opt(sb
, DISCARD
);
3379 sbi
->s_resuid
= make_kuid(&init_user_ns
, le16_to_cpu(es
->s_def_resuid
));
3380 sbi
->s_resgid
= make_kgid(&init_user_ns
, le16_to_cpu(es
->s_def_resgid
));
3381 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
3382 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
3383 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
3385 if ((def_mount_opts
& EXT4_DEFM_NOBARRIER
) == 0)
3386 set_opt(sb
, BARRIER
);
3389 * enable delayed allocation by default
3390 * Use -o nodelalloc to turn it off
3392 if (!IS_EXT3_SB(sb
) &&
3393 ((def_mount_opts
& EXT4_DEFM_NODELALLOC
) == 0))
3394 set_opt(sb
, DELALLOC
);
3397 * set default s_li_wait_mult for lazyinit, for the case there is
3398 * no mount option specified.
3400 sbi
->s_li_wait_mult
= EXT4_DEF_LI_WAIT_MULT
;
3402 if (!parse_options((char *) sbi
->s_es
->s_mount_opts
, sb
,
3403 &journal_devnum
, &journal_ioprio
, 0)) {
3404 ext4_msg(sb
, KERN_WARNING
,
3405 "failed to parse options in superblock: %s",
3406 sbi
->s_es
->s_mount_opts
);
3408 sbi
->s_def_mount_opt
= sbi
->s_mount_opt
;
3409 if (!parse_options((char *) data
, sb
, &journal_devnum
,
3410 &journal_ioprio
, 0))
3413 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
3414 printk_once(KERN_WARNING
"EXT4-fs: Warning: mounting "
3415 "with data=journal disables delayed "
3416 "allocation and O_DIRECT support!\n");
3417 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
3418 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3419 "both data=journal and delalloc");
3422 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
3423 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3424 "both data=journal and delalloc");
3427 if (test_opt(sb
, DELALLOC
))
3428 clear_opt(sb
, DELALLOC
);
3431 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
3432 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
3433 if (blocksize
< PAGE_SIZE
) {
3434 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3435 "dioread_nolock if block size != PAGE_SIZE");
3440 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3441 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
3443 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
3444 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
3445 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
3446 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
3447 ext4_msg(sb
, KERN_WARNING
,
3448 "feature flags set on rev 0 fs, "
3449 "running e2fsck is recommended");
3451 if (IS_EXT2_SB(sb
)) {
3452 if (ext2_feature_set_ok(sb
))
3453 ext4_msg(sb
, KERN_INFO
, "mounting ext2 file system "
3454 "using the ext4 subsystem");
3456 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext2 due "
3457 "to feature incompatibilities");
3462 if (IS_EXT3_SB(sb
)) {
3463 if (ext3_feature_set_ok(sb
))
3464 ext4_msg(sb
, KERN_INFO
, "mounting ext3 file system "
3465 "using the ext4 subsystem");
3467 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext3 due "
3468 "to feature incompatibilities");
3474 * Check feature flags regardless of the revision level, since we
3475 * previously didn't change the revision level when setting the flags,
3476 * so there is a chance incompat flags are set on a rev 0 filesystem.
3478 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
3481 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
3482 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
3483 ext4_msg(sb
, KERN_ERR
,
3484 "Unsupported filesystem blocksize %d", blocksize
);
3488 if (sb
->s_blocksize
!= blocksize
) {
3489 /* Validate the filesystem blocksize */
3490 if (!sb_set_blocksize(sb
, blocksize
)) {
3491 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
3497 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3498 offset
= do_div(logical_sb_block
, blocksize
);
3499 bh
= sb_bread(sb
, logical_sb_block
);
3501 ext4_msg(sb
, KERN_ERR
,
3502 "Can't read superblock on 2nd try");
3505 es
= (struct ext4_super_block
*)(bh
->b_data
+ offset
);
3507 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
3508 ext4_msg(sb
, KERN_ERR
,
3509 "Magic mismatch, very weird!");
3514 has_huge_files
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3515 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
);
3516 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
3518 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
3520 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
3521 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
3522 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
3524 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
3525 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
3526 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
3527 (!is_power_of_2(sbi
->s_inode_size
)) ||
3528 (sbi
->s_inode_size
> blocksize
)) {
3529 ext4_msg(sb
, KERN_ERR
,
3530 "unsupported inode size: %d",
3534 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
3535 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
3538 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
3539 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
3540 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
3541 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
3542 !is_power_of_2(sbi
->s_desc_size
)) {
3543 ext4_msg(sb
, KERN_ERR
,
3544 "unsupported descriptor size %lu",
3549 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
3551 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
3552 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
3553 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
3556 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
3557 if (sbi
->s_inodes_per_block
== 0)
3559 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
3560 sbi
->s_inodes_per_block
;
3561 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
3563 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3564 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
3565 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
3567 for (i
= 0; i
< 4; i
++)
3568 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
3569 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
3570 i
= le32_to_cpu(es
->s_flags
);
3571 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
3572 sbi
->s_hash_unsigned
= 3;
3573 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
3574 #ifdef __CHAR_UNSIGNED__
3575 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
3576 sbi
->s_hash_unsigned
= 3;
3578 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
3582 /* Handle clustersize */
3583 clustersize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_cluster_size
);
3584 has_bigalloc
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3585 EXT4_FEATURE_RO_COMPAT_BIGALLOC
);
3587 if (clustersize
< blocksize
) {
3588 ext4_msg(sb
, KERN_ERR
,
3589 "cluster size (%d) smaller than "
3590 "block size (%d)", clustersize
, blocksize
);
3593 sbi
->s_cluster_bits
= le32_to_cpu(es
->s_log_cluster_size
) -
3594 le32_to_cpu(es
->s_log_block_size
);
3595 sbi
->s_clusters_per_group
=
3596 le32_to_cpu(es
->s_clusters_per_group
);
3597 if (sbi
->s_clusters_per_group
> blocksize
* 8) {
3598 ext4_msg(sb
, KERN_ERR
,
3599 "#clusters per group too big: %lu",
3600 sbi
->s_clusters_per_group
);
3603 if (sbi
->s_blocks_per_group
!=
3604 (sbi
->s_clusters_per_group
* (clustersize
/ blocksize
))) {
3605 ext4_msg(sb
, KERN_ERR
, "blocks per group (%lu) and "
3606 "clusters per group (%lu) inconsistent",
3607 sbi
->s_blocks_per_group
,
3608 sbi
->s_clusters_per_group
);
3612 if (clustersize
!= blocksize
) {
3613 ext4_warning(sb
, "fragment/cluster size (%d) != "
3614 "block size (%d)", clustersize
,
3616 clustersize
= blocksize
;
3618 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
3619 ext4_msg(sb
, KERN_ERR
,
3620 "#blocks per group too big: %lu",
3621 sbi
->s_blocks_per_group
);
3624 sbi
->s_clusters_per_group
= sbi
->s_blocks_per_group
;
3625 sbi
->s_cluster_bits
= 0;
3627 sbi
->s_cluster_ratio
= clustersize
/ blocksize
;
3629 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
3630 ext4_msg(sb
, KERN_ERR
,
3631 "#inodes per group too big: %lu",
3632 sbi
->s_inodes_per_group
);
3637 * Test whether we have more sectors than will fit in sector_t,
3638 * and whether the max offset is addressable by the page cache.
3640 err
= generic_check_addressable(sb
->s_blocksize_bits
,
3641 ext4_blocks_count(es
));
3643 ext4_msg(sb
, KERN_ERR
, "filesystem"
3644 " too large to mount safely on this system");
3645 if (sizeof(sector_t
) < 8)
3646 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
3651 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
3654 /* check blocks count against device size */
3655 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
3656 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
3657 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
3658 "exceeds size of device (%llu blocks)",
3659 ext4_blocks_count(es
), blocks_count
);
3664 * It makes no sense for the first data block to be beyond the end
3665 * of the filesystem.
3667 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
3668 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data "
3669 "block %u is beyond end of filesystem (%llu)",
3670 le32_to_cpu(es
->s_first_data_block
),
3671 ext4_blocks_count(es
));
3674 blocks_count
= (ext4_blocks_count(es
) -
3675 le32_to_cpu(es
->s_first_data_block
) +
3676 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
3677 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
3678 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
3679 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
3680 "(block count %llu, first data block %u, "
3681 "blocks per group %lu)", sbi
->s_groups_count
,
3682 ext4_blocks_count(es
),
3683 le32_to_cpu(es
->s_first_data_block
),
3684 EXT4_BLOCKS_PER_GROUP(sb
));
3687 sbi
->s_groups_count
= blocks_count
;
3688 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
3689 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
3690 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
3691 EXT4_DESC_PER_BLOCK(sb
);
3692 sbi
->s_group_desc
= ext4_kvmalloc(db_count
*
3693 sizeof(struct buffer_head
*),
3695 if (sbi
->s_group_desc
== NULL
) {
3696 ext4_msg(sb
, KERN_ERR
, "not enough memory");
3702 sbi
->s_proc
= proc_mkdir(sb
->s_id
, ext4_proc_root
);
3705 proc_create_data("options", S_IRUGO
, sbi
->s_proc
,
3706 &ext4_seq_options_fops
, sb
);
3708 bgl_lock_init(sbi
->s_blockgroup_lock
);
3710 for (i
= 0; i
< db_count
; i
++) {
3711 block
= descriptor_loc(sb
, logical_sb_block
, i
);
3712 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
3713 if (!sbi
->s_group_desc
[i
]) {
3714 ext4_msg(sb
, KERN_ERR
,
3715 "can't read group descriptor %d", i
);
3720 if (!ext4_check_descriptors(sb
, &first_not_zeroed
)) {
3721 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
3724 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
3725 if (!ext4_fill_flex_info(sb
)) {
3726 ext4_msg(sb
, KERN_ERR
,
3727 "unable to initialize "
3728 "flex_bg meta info!");
3732 sbi
->s_gdb_count
= db_count
;
3733 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
3734 spin_lock_init(&sbi
->s_next_gen_lock
);
3736 init_timer(&sbi
->s_err_report
);
3737 sbi
->s_err_report
.function
= print_daily_error_info
;
3738 sbi
->s_err_report
.data
= (unsigned long) sb
;
3740 err
= percpu_counter_init(&sbi
->s_freeclusters_counter
,
3741 ext4_count_free_clusters(sb
));
3743 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
3744 ext4_count_free_inodes(sb
));
3747 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
3748 ext4_count_dirs(sb
));
3751 err
= percpu_counter_init(&sbi
->s_dirtyclusters_counter
, 0);
3754 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
3759 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
3760 sbi
->s_max_writeback_mb_bump
= 128;
3763 * set up enough so that it can read an inode
3765 if (!test_opt(sb
, NOLOAD
) &&
3766 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
3767 sb
->s_op
= &ext4_sops
;
3769 sb
->s_op
= &ext4_nojournal_sops
;
3770 sb
->s_export_op
= &ext4_export_ops
;
3771 sb
->s_xattr
= ext4_xattr_handlers
;
3773 sb
->s_qcop
= &ext4_qctl_operations
;
3774 sb
->dq_op
= &ext4_quota_operations
;
3776 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
)) {
3777 /* Use qctl operations for hidden quota files. */
3778 sb
->s_qcop
= &ext4_qctl_sysfile_operations
;
3781 memcpy(sb
->s_uuid
, es
->s_uuid
, sizeof(es
->s_uuid
));
3783 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
3784 mutex_init(&sbi
->s_orphan_lock
);
3785 sbi
->s_resize_flags
= 0;
3789 needs_recovery
= (es
->s_last_orphan
!= 0 ||
3790 EXT4_HAS_INCOMPAT_FEATURE(sb
,
3791 EXT4_FEATURE_INCOMPAT_RECOVER
));
3793 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_MMP
) &&
3794 !(sb
->s_flags
& MS_RDONLY
))
3795 if (ext4_multi_mount_protect(sb
, le64_to_cpu(es
->s_mmp_block
)))
3799 * The first inode we look at is the journal inode. Don't try
3800 * root first: it may be modified in the journal!
3802 if (!test_opt(sb
, NOLOAD
) &&
3803 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
3804 if (ext4_load_journal(sb
, es
, journal_devnum
))
3806 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
3807 EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3808 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
3809 "suppressed and not mounted read-only");
3810 goto failed_mount_wq
;
3812 clear_opt(sb
, DATA_FLAGS
);
3813 sbi
->s_journal
= NULL
;
3818 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
) &&
3819 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
3820 JBD2_FEATURE_INCOMPAT_64BIT
)) {
3821 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
3822 goto failed_mount_wq
;
3825 if (!set_journal_csum_feature_set(sb
)) {
3826 ext4_msg(sb
, KERN_ERR
, "Failed to set journal checksum "
3828 goto failed_mount_wq
;
3831 /* We have now updated the journal if required, so we can
3832 * validate the data journaling mode. */
3833 switch (test_opt(sb
, DATA_FLAGS
)) {
3835 /* No mode set, assume a default based on the journal
3836 * capabilities: ORDERED_DATA if the journal can
3837 * cope, else JOURNAL_DATA
3839 if (jbd2_journal_check_available_features
3840 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
3841 set_opt(sb
, ORDERED_DATA
);
3843 set_opt(sb
, JOURNAL_DATA
);
3846 case EXT4_MOUNT_ORDERED_DATA
:
3847 case EXT4_MOUNT_WRITEBACK_DATA
:
3848 if (!jbd2_journal_check_available_features
3849 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
3850 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
3851 "requested data journaling mode");
3852 goto failed_mount_wq
;
3857 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
3859 sbi
->s_journal
->j_commit_callback
= ext4_journal_commit_callback
;
3862 * The journal may have updated the bg summary counts, so we
3863 * need to update the global counters.
3865 percpu_counter_set(&sbi
->s_freeclusters_counter
,
3866 ext4_count_free_clusters(sb
));
3867 percpu_counter_set(&sbi
->s_freeinodes_counter
,
3868 ext4_count_free_inodes(sb
));
3869 percpu_counter_set(&sbi
->s_dirs_counter
,
3870 ext4_count_dirs(sb
));
3871 percpu_counter_set(&sbi
->s_dirtyclusters_counter
, 0);
3875 * Get the # of file system overhead blocks from the
3876 * superblock if present.
3878 if (es
->s_overhead_clusters
)
3879 sbi
->s_overhead
= le32_to_cpu(es
->s_overhead_clusters
);
3881 ret
= ext4_calculate_overhead(sb
);
3883 goto failed_mount_wq
;
3887 * The maximum number of concurrent works can be high and
3888 * concurrency isn't really necessary. Limit it to 1.
3890 EXT4_SB(sb
)->dio_unwritten_wq
=
3891 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM
| WQ_UNBOUND
, 1);
3892 if (!EXT4_SB(sb
)->dio_unwritten_wq
) {
3893 printk(KERN_ERR
"EXT4-fs: failed to create DIO workqueue\n");
3894 goto failed_mount_wq
;
3898 * The jbd2_journal_load will have done any necessary log recovery,
3899 * so we can safely mount the rest of the filesystem now.
3902 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
3904 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
3905 ret
= PTR_ERR(root
);
3909 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
3910 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
3914 sb
->s_root
= d_make_root(root
);
3916 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
3921 if (ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
))
3922 sb
->s_flags
|= MS_RDONLY
;
3924 /* determine the minimum size of new large inodes, if present */
3925 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
3926 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
3927 EXT4_GOOD_OLD_INODE_SIZE
;
3928 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3929 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
3930 if (sbi
->s_want_extra_isize
<
3931 le16_to_cpu(es
->s_want_extra_isize
))
3932 sbi
->s_want_extra_isize
=
3933 le16_to_cpu(es
->s_want_extra_isize
);
3934 if (sbi
->s_want_extra_isize
<
3935 le16_to_cpu(es
->s_min_extra_isize
))
3936 sbi
->s_want_extra_isize
=
3937 le16_to_cpu(es
->s_min_extra_isize
);
3940 /* Check if enough inode space is available */
3941 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
3942 sbi
->s_inode_size
) {
3943 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
3944 EXT4_GOOD_OLD_INODE_SIZE
;
3945 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
3949 err
= ext4_setup_system_zone(sb
);
3951 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
3953 goto failed_mount4a
;
3957 err
= ext4_mb_init(sb
);
3959 ext4_msg(sb
, KERN_ERR
, "failed to initialize mballoc (%d)",
3964 err
= ext4_register_li_request(sb
, first_not_zeroed
);
3968 sbi
->s_kobj
.kset
= ext4_kset
;
3969 init_completion(&sbi
->s_kobj_unregister
);
3970 err
= kobject_init_and_add(&sbi
->s_kobj
, &ext4_ktype
, NULL
,
3975 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
3976 ext4_orphan_cleanup(sb
, es
);
3977 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
3978 if (needs_recovery
) {
3979 ext4_msg(sb
, KERN_INFO
, "recovery complete");
3980 ext4_mark_recovery_complete(sb
, es
);
3982 if (EXT4_SB(sb
)->s_journal
) {
3983 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
3984 descr
= " journalled data mode";
3985 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
3986 descr
= " ordered data mode";
3988 descr
= " writeback data mode";
3990 descr
= "out journal";
3993 /* Enable quota usage during mount. */
3994 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
) &&
3995 !(sb
->s_flags
& MS_RDONLY
)) {
3996 ret
= ext4_enable_quotas(sb
);
4000 #endif /* CONFIG_QUOTA */
4002 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s. "
4003 "Opts: %s%s%s", descr
, sbi
->s_es
->s_mount_opts
,
4004 *sbi
->s_es
->s_mount_opts
? "; " : "", orig_data
);
4006 if (es
->s_error_count
)
4007 mod_timer(&sbi
->s_err_report
, jiffies
+ 300*HZ
); /* 5 minutes */
4014 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
4018 ext4_unregister_li_request(sb
);
4020 ext4_mb_release(sb
);
4022 ext4_ext_release(sb
);
4023 ext4_release_system_zone(sb
);
4028 ext4_msg(sb
, KERN_ERR
, "mount failed");
4029 destroy_workqueue(EXT4_SB(sb
)->dio_unwritten_wq
);
4031 if (sbi
->s_journal
) {
4032 jbd2_journal_destroy(sbi
->s_journal
);
4033 sbi
->s_journal
= NULL
;
4036 del_timer(&sbi
->s_err_report
);
4037 if (sbi
->s_flex_groups
)
4038 ext4_kvfree(sbi
->s_flex_groups
);
4039 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
4040 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
4041 percpu_counter_destroy(&sbi
->s_dirs_counter
);
4042 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
4044 kthread_stop(sbi
->s_mmp_tsk
);
4046 for (i
= 0; i
< db_count
; i
++)
4047 brelse(sbi
->s_group_desc
[i
]);
4048 ext4_kvfree(sbi
->s_group_desc
);
4050 if (sbi
->s_chksum_driver
)
4051 crypto_free_shash(sbi
->s_chksum_driver
);
4053 remove_proc_entry("options", sbi
->s_proc
);
4054 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
4057 for (i
= 0; i
< MAXQUOTAS
; i
++)
4058 kfree(sbi
->s_qf_names
[i
]);
4060 ext4_blkdev_remove(sbi
);
4063 sb
->s_fs_info
= NULL
;
4064 kfree(sbi
->s_blockgroup_lock
);
4072 * Setup any per-fs journal parameters now. We'll do this both on
4073 * initial mount, once the journal has been initialised but before we've
4074 * done any recovery; and again on any subsequent remount.
4076 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
4078 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4080 journal
->j_commit_interval
= sbi
->s_commit_interval
;
4081 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
4082 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
4084 write_lock(&journal
->j_state_lock
);
4085 if (test_opt(sb
, BARRIER
))
4086 journal
->j_flags
|= JBD2_BARRIER
;
4088 journal
->j_flags
&= ~JBD2_BARRIER
;
4089 if (test_opt(sb
, DATA_ERR_ABORT
))
4090 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
4092 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
4093 write_unlock(&journal
->j_state_lock
);
4096 static journal_t
*ext4_get_journal(struct super_block
*sb
,
4097 unsigned int journal_inum
)
4099 struct inode
*journal_inode
;
4102 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4104 /* First, test for the existence of a valid inode on disk. Bad
4105 * things happen if we iget() an unused inode, as the subsequent
4106 * iput() will try to delete it. */
4108 journal_inode
= ext4_iget(sb
, journal_inum
);
4109 if (IS_ERR(journal_inode
)) {
4110 ext4_msg(sb
, KERN_ERR
, "no journal found");
4113 if (!journal_inode
->i_nlink
) {
4114 make_bad_inode(journal_inode
);
4115 iput(journal_inode
);
4116 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
4120 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4121 journal_inode
, journal_inode
->i_size
);
4122 if (!S_ISREG(journal_inode
->i_mode
)) {
4123 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
4124 iput(journal_inode
);
4128 journal
= jbd2_journal_init_inode(journal_inode
);
4130 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
4131 iput(journal_inode
);
4134 journal
->j_private
= sb
;
4135 ext4_init_journal_params(sb
, journal
);
4139 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
4142 struct buffer_head
*bh
;
4146 int hblock
, blocksize
;
4147 ext4_fsblk_t sb_block
;
4148 unsigned long offset
;
4149 struct ext4_super_block
*es
;
4150 struct block_device
*bdev
;
4152 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4154 bdev
= ext4_blkdev_get(j_dev
, sb
);
4158 blocksize
= sb
->s_blocksize
;
4159 hblock
= bdev_logical_block_size(bdev
);
4160 if (blocksize
< hblock
) {
4161 ext4_msg(sb
, KERN_ERR
,
4162 "blocksize too small for journal device");
4166 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
4167 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
4168 set_blocksize(bdev
, blocksize
);
4169 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
4170 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
4171 "external journal");
4175 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
4176 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
4177 !(le32_to_cpu(es
->s_feature_incompat
) &
4178 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
4179 ext4_msg(sb
, KERN_ERR
, "external journal has "
4185 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
4186 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
4191 len
= ext4_blocks_count(es
);
4192 start
= sb_block
+ 1;
4193 brelse(bh
); /* we're done with the superblock */
4195 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
4196 start
, len
, blocksize
);
4198 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
4201 journal
->j_private
= sb
;
4202 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
4203 wait_on_buffer(journal
->j_sb_buffer
);
4204 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
4205 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
4208 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
4209 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
4210 "user (unsupported) - %d",
4211 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
4214 EXT4_SB(sb
)->journal_bdev
= bdev
;
4215 ext4_init_journal_params(sb
, journal
);
4219 jbd2_journal_destroy(journal
);
4221 ext4_blkdev_put(bdev
);
4225 static int ext4_load_journal(struct super_block
*sb
,
4226 struct ext4_super_block
*es
,
4227 unsigned long journal_devnum
)
4230 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
4233 int really_read_only
;
4235 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4237 if (journal_devnum
&&
4238 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4239 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
4240 "numbers have changed");
4241 journal_dev
= new_decode_dev(journal_devnum
);
4243 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
4245 really_read_only
= bdev_read_only(sb
->s_bdev
);
4248 * Are we loading a blank journal or performing recovery after a
4249 * crash? For recovery, we need to check in advance whether we
4250 * can get read-write access to the device.
4252 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
4253 if (sb
->s_flags
& MS_RDONLY
) {
4254 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
4255 "required on readonly filesystem");
4256 if (really_read_only
) {
4257 ext4_msg(sb
, KERN_ERR
, "write access "
4258 "unavailable, cannot proceed");
4261 ext4_msg(sb
, KERN_INFO
, "write access will "
4262 "be enabled during recovery");
4266 if (journal_inum
&& journal_dev
) {
4267 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
4268 "and inode journals!");
4273 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
4276 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
4280 if (!(journal
->j_flags
& JBD2_BARRIER
))
4281 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
4283 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
4284 err
= jbd2_journal_wipe(journal
, !really_read_only
);
4286 char *save
= kmalloc(EXT4_S_ERR_LEN
, GFP_KERNEL
);
4288 memcpy(save
, ((char *) es
) +
4289 EXT4_S_ERR_START
, EXT4_S_ERR_LEN
);
4290 err
= jbd2_journal_load(journal
);
4292 memcpy(((char *) es
) + EXT4_S_ERR_START
,
4293 save
, EXT4_S_ERR_LEN
);
4298 ext4_msg(sb
, KERN_ERR
, "error loading journal");
4299 jbd2_journal_destroy(journal
);
4303 EXT4_SB(sb
)->s_journal
= journal
;
4304 ext4_clear_journal_err(sb
, es
);
4306 if (!really_read_only
&& journal_devnum
&&
4307 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4308 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
4310 /* Make sure we flush the recovery flag to disk. */
4311 ext4_commit_super(sb
, 1);
4317 static int ext4_commit_super(struct super_block
*sb
, int sync
)
4319 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
4320 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
4323 if (!sbh
|| block_device_ejected(sb
))
4325 if (buffer_write_io_error(sbh
)) {
4327 * Oh, dear. A previous attempt to write the
4328 * superblock failed. This could happen because the
4329 * USB device was yanked out. Or it could happen to
4330 * be a transient write error and maybe the block will
4331 * be remapped. Nothing we can do but to retry the
4332 * write and hope for the best.
4334 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
4335 "superblock detected");
4336 clear_buffer_write_io_error(sbh
);
4337 set_buffer_uptodate(sbh
);
4340 * If the file system is mounted read-only, don't update the
4341 * superblock write time. This avoids updating the superblock
4342 * write time when we are mounting the root file system
4343 * read/only but we need to replay the journal; at that point,
4344 * for people who are east of GMT and who make their clock
4345 * tick in localtime for Windows bug-for-bug compatibility,
4346 * the clock is set in the future, and this will cause e2fsck
4347 * to complain and force a full file system check.
4349 if (!(sb
->s_flags
& MS_RDONLY
))
4350 es
->s_wtime
= cpu_to_le32(get_seconds());
4351 if (sb
->s_bdev
->bd_part
)
4352 es
->s_kbytes_written
=
4353 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
4354 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
4355 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
4357 es
->s_kbytes_written
=
4358 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
);
4359 ext4_free_blocks_count_set(es
,
4360 EXT4_C2B(EXT4_SB(sb
), percpu_counter_sum_positive(
4361 &EXT4_SB(sb
)->s_freeclusters_counter
)));
4362 es
->s_free_inodes_count
=
4363 cpu_to_le32(percpu_counter_sum_positive(
4364 &EXT4_SB(sb
)->s_freeinodes_counter
));
4365 BUFFER_TRACE(sbh
, "marking dirty");
4366 ext4_superblock_csum_set(sb
, es
);
4367 mark_buffer_dirty(sbh
);
4369 error
= sync_dirty_buffer(sbh
);
4373 error
= buffer_write_io_error(sbh
);
4375 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
4377 clear_buffer_write_io_error(sbh
);
4378 set_buffer_uptodate(sbh
);
4385 * Have we just finished recovery? If so, and if we are mounting (or
4386 * remounting) the filesystem readonly, then we will end up with a
4387 * consistent fs on disk. Record that fact.
4389 static void ext4_mark_recovery_complete(struct super_block
*sb
,
4390 struct ext4_super_block
*es
)
4392 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
4394 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
4395 BUG_ON(journal
!= NULL
);
4398 jbd2_journal_lock_updates(journal
);
4399 if (jbd2_journal_flush(journal
) < 0)
4402 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
4403 sb
->s_flags
& MS_RDONLY
) {
4404 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4405 ext4_commit_super(sb
, 1);
4409 jbd2_journal_unlock_updates(journal
);
4413 * If we are mounting (or read-write remounting) a filesystem whose journal
4414 * has recorded an error from a previous lifetime, move that error to the
4415 * main filesystem now.
4417 static void ext4_clear_journal_err(struct super_block
*sb
,
4418 struct ext4_super_block
*es
)
4424 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4426 journal
= EXT4_SB(sb
)->s_journal
;
4429 * Now check for any error status which may have been recorded in the
4430 * journal by a prior ext4_error() or ext4_abort()
4433 j_errno
= jbd2_journal_errno(journal
);
4437 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
4438 ext4_warning(sb
, "Filesystem error recorded "
4439 "from previous mount: %s", errstr
);
4440 ext4_warning(sb
, "Marking fs in need of filesystem check.");
4442 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
4443 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
4444 ext4_commit_super(sb
, 1);
4446 jbd2_journal_clear_err(journal
);
4451 * Force the running and committing transactions to commit,
4452 * and wait on the commit.
4454 int ext4_force_commit(struct super_block
*sb
)
4459 if (sb
->s_flags
& MS_RDONLY
)
4462 journal
= EXT4_SB(sb
)->s_journal
;
4464 vfs_check_frozen(sb
, SB_FREEZE_TRANS
);
4465 ret
= ext4_journal_force_commit(journal
);
4471 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
4475 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4477 trace_ext4_sync_fs(sb
, wait
);
4478 flush_workqueue(sbi
->dio_unwritten_wq
);
4480 * Writeback quota in non-journalled quota case - journalled quota has
4483 dquot_writeback_dquots(sb
, -1);
4484 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
4486 jbd2_log_wait_commit(sbi
->s_journal
, target
);
4492 * LVM calls this function before a (read-only) snapshot is created. This
4493 * gives us a chance to flush the journal completely and mark the fs clean.
4495 * Note that only this function cannot bring a filesystem to be in a clean
4496 * state independently, because ext4 prevents a new handle from being started
4497 * by @sb->s_frozen, which stays in an upper layer. It thus needs help from
4500 static int ext4_freeze(struct super_block
*sb
)
4505 if (sb
->s_flags
& MS_RDONLY
)
4508 journal
= EXT4_SB(sb
)->s_journal
;
4510 /* Now we set up the journal barrier. */
4511 jbd2_journal_lock_updates(journal
);
4514 * Don't clear the needs_recovery flag if we failed to flush
4517 error
= jbd2_journal_flush(journal
);
4521 /* Journal blocked and flushed, clear needs_recovery flag. */
4522 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4523 error
= ext4_commit_super(sb
, 1);
4525 /* we rely on s_frozen to stop further updates */
4526 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
4531 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4532 * flag here, even though the filesystem is not technically dirty yet.
4534 static int ext4_unfreeze(struct super_block
*sb
)
4536 if (sb
->s_flags
& MS_RDONLY
)
4540 /* Reset the needs_recovery flag before the fs is unlocked. */
4541 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4542 ext4_commit_super(sb
, 1);
4548 * Structure to save mount options for ext4_remount's benefit
4550 struct ext4_mount_options
{
4551 unsigned long s_mount_opt
;
4552 unsigned long s_mount_opt2
;
4555 unsigned long s_commit_interval
;
4556 u32 s_min_batch_time
, s_max_batch_time
;
4559 char *s_qf_names
[MAXQUOTAS
];
4563 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
4565 struct ext4_super_block
*es
;
4566 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4567 unsigned long old_sb_flags
;
4568 struct ext4_mount_options old_opts
;
4569 int enable_quota
= 0;
4571 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
4576 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
4578 /* Store the original options */
4580 old_sb_flags
= sb
->s_flags
;
4581 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
4582 old_opts
.s_mount_opt2
= sbi
->s_mount_opt2
;
4583 old_opts
.s_resuid
= sbi
->s_resuid
;
4584 old_opts
.s_resgid
= sbi
->s_resgid
;
4585 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
4586 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
4587 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
4589 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
4590 for (i
= 0; i
< MAXQUOTAS
; i
++)
4591 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
4593 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
4594 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
4597 * Allow the "check" option to be passed as a remount option.
4599 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
, 1)) {
4604 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
4605 ext4_abort(sb
, "Abort forced by user");
4607 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
4608 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
4612 if (sbi
->s_journal
) {
4613 ext4_init_journal_params(sb
, sbi
->s_journal
);
4614 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
4617 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
)) {
4618 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
4623 if (*flags
& MS_RDONLY
) {
4624 err
= dquot_suspend(sb
, -1);
4629 * First of all, the unconditional stuff we have to do
4630 * to disable replay of the journal when we next remount
4632 sb
->s_flags
|= MS_RDONLY
;
4635 * OK, test if we are remounting a valid rw partition
4636 * readonly, and if so set the rdonly flag and then
4637 * mark the partition as valid again.
4639 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
4640 (sbi
->s_mount_state
& EXT4_VALID_FS
))
4641 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
4644 ext4_mark_recovery_complete(sb
, es
);
4646 /* Make sure we can mount this feature set readwrite */
4647 if (!ext4_feature_set_ok(sb
, 0)) {
4652 * Make sure the group descriptor checksums
4653 * are sane. If they aren't, refuse to remount r/w.
4655 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
4656 struct ext4_group_desc
*gdp
=
4657 ext4_get_group_desc(sb
, g
, NULL
);
4659 if (!ext4_group_desc_csum_verify(sb
, g
, gdp
)) {
4660 ext4_msg(sb
, KERN_ERR
,
4661 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4662 g
, le16_to_cpu(ext4_group_desc_csum(sbi
, g
, gdp
)),
4663 le16_to_cpu(gdp
->bg_checksum
));
4670 * If we have an unprocessed orphan list hanging
4671 * around from a previously readonly bdev mount,
4672 * require a full umount/remount for now.
4674 if (es
->s_last_orphan
) {
4675 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
4676 "remount RDWR because of unprocessed "
4677 "orphan inode list. Please "
4678 "umount/remount instead");
4684 * Mounting a RDONLY partition read-write, so reread
4685 * and store the current valid flag. (It may have
4686 * been changed by e2fsck since we originally mounted
4690 ext4_clear_journal_err(sb
, es
);
4691 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
4692 if (!ext4_setup_super(sb
, es
, 0))
4693 sb
->s_flags
&= ~MS_RDONLY
;
4694 if (EXT4_HAS_INCOMPAT_FEATURE(sb
,
4695 EXT4_FEATURE_INCOMPAT_MMP
))
4696 if (ext4_multi_mount_protect(sb
,
4697 le64_to_cpu(es
->s_mmp_block
))) {
4706 * Reinitialize lazy itable initialization thread based on
4709 if ((sb
->s_flags
& MS_RDONLY
) || !test_opt(sb
, INIT_INODE_TABLE
))
4710 ext4_unregister_li_request(sb
);
4712 ext4_group_t first_not_zeroed
;
4713 first_not_zeroed
= ext4_has_uninit_itable(sb
);
4714 ext4_register_li_request(sb
, first_not_zeroed
);
4717 ext4_setup_system_zone(sb
);
4718 if (sbi
->s_journal
== NULL
)
4719 ext4_commit_super(sb
, 1);
4723 /* Release old quota file names */
4724 for (i
= 0; i
< MAXQUOTAS
; i
++)
4725 if (old_opts
.s_qf_names
[i
] &&
4726 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
4727 kfree(old_opts
.s_qf_names
[i
]);
4729 if (sb_any_quota_suspended(sb
))
4730 dquot_resume(sb
, -1);
4731 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
4732 EXT4_FEATURE_RO_COMPAT_QUOTA
)) {
4733 err
= ext4_enable_quotas(sb
);
4742 ext4_msg(sb
, KERN_INFO
, "re-mounted. Opts: %s", orig_data
);
4747 sb
->s_flags
= old_sb_flags
;
4748 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
4749 sbi
->s_mount_opt2
= old_opts
.s_mount_opt2
;
4750 sbi
->s_resuid
= old_opts
.s_resuid
;
4751 sbi
->s_resgid
= old_opts
.s_resgid
;
4752 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
4753 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
4754 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
4756 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
4757 for (i
= 0; i
< MAXQUOTAS
; i
++) {
4758 if (sbi
->s_qf_names
[i
] &&
4759 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
4760 kfree(sbi
->s_qf_names
[i
]);
4761 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
4769 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
4771 struct super_block
*sb
= dentry
->d_sb
;
4772 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4773 struct ext4_super_block
*es
= sbi
->s_es
;
4774 ext4_fsblk_t overhead
= 0;
4778 if (!test_opt(sb
, MINIX_DF
))
4779 overhead
= sbi
->s_overhead
;
4781 buf
->f_type
= EXT4_SUPER_MAGIC
;
4782 buf
->f_bsize
= sb
->s_blocksize
;
4783 buf
->f_blocks
= ext4_blocks_count(es
) - EXT4_C2B(sbi
, sbi
->s_overhead
);
4784 bfree
= percpu_counter_sum_positive(&sbi
->s_freeclusters_counter
) -
4785 percpu_counter_sum_positive(&sbi
->s_dirtyclusters_counter
);
4786 /* prevent underflow in case that few free space is available */
4787 buf
->f_bfree
= EXT4_C2B(sbi
, max_t(s64
, bfree
, 0));
4788 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
4789 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
4791 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
4792 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
4793 buf
->f_namelen
= EXT4_NAME_LEN
;
4794 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
4795 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
4796 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
4797 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
4802 /* Helper function for writing quotas on sync - we need to start transaction
4803 * before quota file is locked for write. Otherwise the are possible deadlocks:
4804 * Process 1 Process 2
4805 * ext4_create() quota_sync()
4806 * jbd2_journal_start() write_dquot()
4807 * dquot_initialize() down(dqio_mutex)
4808 * down(dqio_mutex) jbd2_journal_start()
4814 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
4816 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_type
];
4819 static int ext4_write_dquot(struct dquot
*dquot
)
4823 struct inode
*inode
;
4825 inode
= dquot_to_inode(dquot
);
4826 handle
= ext4_journal_start(inode
,
4827 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
4829 return PTR_ERR(handle
);
4830 ret
= dquot_commit(dquot
);
4831 err
= ext4_journal_stop(handle
);
4837 static int ext4_acquire_dquot(struct dquot
*dquot
)
4842 handle
= ext4_journal_start(dquot_to_inode(dquot
),
4843 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
4845 return PTR_ERR(handle
);
4846 ret
= dquot_acquire(dquot
);
4847 err
= ext4_journal_stop(handle
);
4853 static int ext4_release_dquot(struct dquot
*dquot
)
4858 handle
= ext4_journal_start(dquot_to_inode(dquot
),
4859 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
4860 if (IS_ERR(handle
)) {
4861 /* Release dquot anyway to avoid endless cycle in dqput() */
4862 dquot_release(dquot
);
4863 return PTR_ERR(handle
);
4865 ret
= dquot_release(dquot
);
4866 err
= ext4_journal_stop(handle
);
4872 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
4874 /* Are we journaling quotas? */
4875 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
4876 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
4877 dquot_mark_dquot_dirty(dquot
);
4878 return ext4_write_dquot(dquot
);
4880 return dquot_mark_dquot_dirty(dquot
);
4884 static int ext4_write_info(struct super_block
*sb
, int type
)
4889 /* Data block + inode block */
4890 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
4892 return PTR_ERR(handle
);
4893 ret
= dquot_commit_info(sb
, type
);
4894 err
= ext4_journal_stop(handle
);
4901 * Turn on quotas during mount time - we need to find
4902 * the quota file and such...
4904 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
4906 return dquot_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
4907 EXT4_SB(sb
)->s_jquota_fmt
, type
);
4911 * Standard function to be called on quota_on
4913 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
4918 if (!test_opt(sb
, QUOTA
))
4921 /* Quotafile not on the same filesystem? */
4922 if (path
->dentry
->d_sb
!= sb
)
4924 /* Journaling quota? */
4925 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
4926 /* Quotafile not in fs root? */
4927 if (path
->dentry
->d_parent
!= sb
->s_root
)
4928 ext4_msg(sb
, KERN_WARNING
,
4929 "Quota file not on filesystem root. "
4930 "Journaled quota will not work");
4934 * When we journal data on quota file, we have to flush journal to see
4935 * all updates to the file when we bypass pagecache...
4937 if (EXT4_SB(sb
)->s_journal
&&
4938 ext4_should_journal_data(path
->dentry
->d_inode
)) {
4940 * We don't need to lock updates but journal_flush() could
4941 * otherwise be livelocked...
4943 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
4944 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
4945 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
4950 return dquot_quota_on(sb
, type
, format_id
, path
);
4953 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
4957 struct inode
*qf_inode
;
4958 unsigned long qf_inums
[MAXQUOTAS
] = {
4959 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
4960 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
)
4963 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
));
4965 if (!qf_inums
[type
])
4968 qf_inode
= ext4_iget(sb
, qf_inums
[type
]);
4969 if (IS_ERR(qf_inode
)) {
4970 ext4_error(sb
, "Bad quota inode # %lu", qf_inums
[type
]);
4971 return PTR_ERR(qf_inode
);
4974 err
= dquot_enable(qf_inode
, type
, format_id
, flags
);
4980 /* Enable usage tracking for all quota types. */
4981 static int ext4_enable_quotas(struct super_block
*sb
)
4984 unsigned long qf_inums
[MAXQUOTAS
] = {
4985 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
4986 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
)
4989 sb_dqopt(sb
)->flags
|= DQUOT_QUOTA_SYS_FILE
;
4990 for (type
= 0; type
< MAXQUOTAS
; type
++) {
4991 if (qf_inums
[type
]) {
4992 err
= ext4_quota_enable(sb
, type
, QFMT_VFS_V1
,
4993 DQUOT_USAGE_ENABLED
);
4996 "Failed to enable quota (type=%d) "
4997 "tracking. Please run e2fsck to fix.",
5007 * quota_on function that is used when QUOTA feature is set.
5009 static int ext4_quota_on_sysfile(struct super_block
*sb
, int type
,
5012 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
))
5016 * USAGE was enabled at mount time. Only need to enable LIMITS now.
5018 return ext4_quota_enable(sb
, type
, format_id
, DQUOT_LIMITS_ENABLED
);
5021 static int ext4_quota_off(struct super_block
*sb
, int type
)
5023 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5026 /* Force all delayed allocation blocks to be allocated.
5027 * Caller already holds s_umount sem */
5028 if (test_opt(sb
, DELALLOC
))
5029 sync_filesystem(sb
);
5034 /* Update modification times of quota files when userspace can
5035 * start looking at them */
5036 handle
= ext4_journal_start(inode
, 1);
5039 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
5040 ext4_mark_inode_dirty(handle
, inode
);
5041 ext4_journal_stop(handle
);
5044 return dquot_quota_off(sb
, type
);
5048 * quota_off function that is used when QUOTA feature is set.
5050 static int ext4_quota_off_sysfile(struct super_block
*sb
, int type
)
5052 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
))
5055 /* Disable only the limits. */
5056 return dquot_disable(sb
, type
, DQUOT_LIMITS_ENABLED
);
5059 /* Read data from quotafile - avoid pagecache and such because we cannot afford
5060 * acquiring the locks... As quota files are never truncated and quota code
5061 * itself serializes the operations (and no one else should touch the files)
5062 * we don't have to be afraid of races */
5063 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
5064 size_t len
, loff_t off
)
5066 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5067 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5069 int offset
= off
& (sb
->s_blocksize
- 1);
5072 struct buffer_head
*bh
;
5073 loff_t i_size
= i_size_read(inode
);
5077 if (off
+len
> i_size
)
5080 while (toread
> 0) {
5081 tocopy
= sb
->s_blocksize
- offset
< toread
?
5082 sb
->s_blocksize
- offset
: toread
;
5083 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
5086 if (!bh
) /* A hole? */
5087 memset(data
, 0, tocopy
);
5089 memcpy(data
, bh
->b_data
+offset
, tocopy
);
5099 /* Write to quotafile (we know the transaction is already started and has
5100 * enough credits) */
5101 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
5102 const char *data
, size_t len
, loff_t off
)
5104 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5105 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5107 int offset
= off
& (sb
->s_blocksize
- 1);
5108 struct buffer_head
*bh
;
5109 handle_t
*handle
= journal_current_handle();
5111 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
5112 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5113 " cancelled because transaction is not started",
5114 (unsigned long long)off
, (unsigned long long)len
);
5118 * Since we account only one data block in transaction credits,
5119 * then it is impossible to cross a block boundary.
5121 if (sb
->s_blocksize
- offset
< len
) {
5122 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5123 " cancelled because not block aligned",
5124 (unsigned long long)off
, (unsigned long long)len
);
5128 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
5131 err
= ext4_journal_get_write_access(handle
, bh
);
5137 memcpy(bh
->b_data
+offset
, data
, len
);
5138 flush_dcache_page(bh
->b_page
);
5140 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
5145 if (inode
->i_size
< off
+ len
) {
5146 i_size_write(inode
, off
+ len
);
5147 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
5148 ext4_mark_inode_dirty(handle
, inode
);
5155 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
5156 const char *dev_name
, void *data
)
5158 return mount_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
);
5161 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5162 static inline void register_as_ext2(void)
5164 int err
= register_filesystem(&ext2_fs_type
);
5167 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
5170 static inline void unregister_as_ext2(void)
5172 unregister_filesystem(&ext2_fs_type
);
5175 static inline int ext2_feature_set_ok(struct super_block
*sb
)
5177 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT2_FEATURE_INCOMPAT_SUPP
))
5179 if (sb
->s_flags
& MS_RDONLY
)
5181 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT2_FEATURE_RO_COMPAT_SUPP
))
5185 MODULE_ALIAS("ext2");
5187 static inline void register_as_ext2(void) { }
5188 static inline void unregister_as_ext2(void) { }
5189 static inline int ext2_feature_set_ok(struct super_block
*sb
) { return 0; }
5192 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5193 static inline void register_as_ext3(void)
5195 int err
= register_filesystem(&ext3_fs_type
);
5198 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
5201 static inline void unregister_as_ext3(void)
5203 unregister_filesystem(&ext3_fs_type
);
5206 static inline int ext3_feature_set_ok(struct super_block
*sb
)
5208 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT3_FEATURE_INCOMPAT_SUPP
))
5210 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
5212 if (sb
->s_flags
& MS_RDONLY
)
5214 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT3_FEATURE_RO_COMPAT_SUPP
))
5218 MODULE_ALIAS("ext3");
5220 static inline void register_as_ext3(void) { }
5221 static inline void unregister_as_ext3(void) { }
5222 static inline int ext3_feature_set_ok(struct super_block
*sb
) { return 0; }
5225 static struct file_system_type ext4_fs_type
= {
5226 .owner
= THIS_MODULE
,
5228 .mount
= ext4_mount
,
5229 .kill_sb
= kill_block_super
,
5230 .fs_flags
= FS_REQUIRES_DEV
,
5233 static int __init
ext4_init_feat_adverts(void)
5235 struct ext4_features
*ef
;
5238 ef
= kzalloc(sizeof(struct ext4_features
), GFP_KERNEL
);
5242 ef
->f_kobj
.kset
= ext4_kset
;
5243 init_completion(&ef
->f_kobj_unregister
);
5244 ret
= kobject_init_and_add(&ef
->f_kobj
, &ext4_feat_ktype
, NULL
,
5257 static void ext4_exit_feat_adverts(void)
5259 kobject_put(&ext4_feat
->f_kobj
);
5260 wait_for_completion(&ext4_feat
->f_kobj_unregister
);
5264 /* Shared across all ext4 file systems */
5265 wait_queue_head_t ext4__ioend_wq
[EXT4_WQ_HASH_SZ
];
5266 struct mutex ext4__aio_mutex
[EXT4_WQ_HASH_SZ
];
5268 static int __init
ext4_init_fs(void)
5272 ext4_li_info
= NULL
;
5273 mutex_init(&ext4_li_mtx
);
5275 ext4_check_flag_values();
5277 for (i
= 0; i
< EXT4_WQ_HASH_SZ
; i
++) {
5278 mutex_init(&ext4__aio_mutex
[i
]);
5279 init_waitqueue_head(&ext4__ioend_wq
[i
]);
5282 err
= ext4_init_pageio();
5285 err
= ext4_init_system_zone();
5288 ext4_kset
= kset_create_and_add("ext4", NULL
, fs_kobj
);
5291 ext4_proc_root
= proc_mkdir("fs/ext4", NULL
);
5293 err
= ext4_init_feat_adverts();
5297 err
= ext4_init_mballoc();
5301 err
= ext4_init_xattr();
5304 err
= init_inodecache();
5309 err
= register_filesystem(&ext4_fs_type
);
5315 unregister_as_ext2();
5316 unregister_as_ext3();
5317 destroy_inodecache();
5321 ext4_exit_mballoc();
5323 ext4_exit_feat_adverts();
5326 remove_proc_entry("fs/ext4", NULL
);
5327 kset_unregister(ext4_kset
);
5329 ext4_exit_system_zone();
5335 static void __exit
ext4_exit_fs(void)
5337 ext4_destroy_lazyinit_thread();
5338 unregister_as_ext2();
5339 unregister_as_ext3();
5340 unregister_filesystem(&ext4_fs_type
);
5341 destroy_inodecache();
5343 ext4_exit_mballoc();
5344 ext4_exit_feat_adverts();
5345 remove_proc_entry("fs/ext4", NULL
);
5346 kset_unregister(ext4_kset
);
5347 ext4_exit_system_zone();
5351 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5352 MODULE_DESCRIPTION("Fourth Extended Filesystem");
5353 MODULE_LICENSE("GPL");
5354 module_init(ext4_init_fs
)
5355 module_exit(ext4_exit_fs
)