2 * linux/fs/ext4/super.c
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
11 * linux/fs/minix/inode.c
13 * Copyright (C) 1991, 1992 Linus Torvalds
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
19 #include <linux/module.h>
20 #include <linux/string.h>
22 #include <linux/time.h>
23 #include <linux/vmalloc.h>
24 #include <linux/jbd2.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/blkdev.h>
28 #include <linux/parser.h>
29 #include <linux/buffer_head.h>
30 #include <linux/exportfs.h>
31 #include <linux/vfs.h>
32 #include <linux/random.h>
33 #include <linux/mount.h>
34 #include <linux/namei.h>
35 #include <linux/quotaops.h>
36 #include <linux/seq_file.h>
37 #include <linux/proc_fs.h>
38 #include <linux/ctype.h>
39 #include <linux/log2.h>
40 #include <linux/crc16.h>
41 #include <linux/cleancache.h>
42 #include <asm/uaccess.h>
44 #include <linux/kthread.h>
45 #include <linux/freezer.h>
48 #include "ext4_extents.h" /* Needed for trace points definition */
49 #include "ext4_jbd2.h"
54 #define CREATE_TRACE_POINTS
55 #include <trace/events/ext4.h>
57 static struct proc_dir_entry
*ext4_proc_root
;
58 static struct kset
*ext4_kset
;
59 static struct ext4_lazy_init
*ext4_li_info
;
60 static struct mutex ext4_li_mtx
;
61 static struct ext4_features
*ext4_feat
;
63 static int ext4_load_journal(struct super_block
*, struct ext4_super_block
*,
64 unsigned long journal_devnum
);
65 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
);
66 static int ext4_commit_super(struct super_block
*sb
, int sync
);
67 static void ext4_mark_recovery_complete(struct super_block
*sb
,
68 struct ext4_super_block
*es
);
69 static void ext4_clear_journal_err(struct super_block
*sb
,
70 struct ext4_super_block
*es
);
71 static int ext4_sync_fs(struct super_block
*sb
, int wait
);
72 static 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
)
148 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
150 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
,
151 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))
154 es
->s_checksum
= ext4_superblock_csum(sb
, es
);
157 void *ext4_kvmalloc(size_t size
, gfp_t flags
)
161 ret
= kmalloc(size
, flags
);
163 ret
= __vmalloc(size
, flags
, PAGE_KERNEL
);
167 void *ext4_kvzalloc(size_t size
, gfp_t flags
)
171 ret
= kzalloc(size
, flags
);
173 ret
= __vmalloc(size
, flags
| __GFP_ZERO
, PAGE_KERNEL
);
177 void ext4_kvfree(void *ptr
)
179 if (is_vmalloc_addr(ptr
))
186 ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
187 struct ext4_group_desc
*bg
)
189 return le32_to_cpu(bg
->bg_block_bitmap_lo
) |
190 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
191 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
194 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
195 struct ext4_group_desc
*bg
)
197 return le32_to_cpu(bg
->bg_inode_bitmap_lo
) |
198 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
199 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
202 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
203 struct ext4_group_desc
*bg
)
205 return le32_to_cpu(bg
->bg_inode_table_lo
) |
206 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
207 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
210 __u32
ext4_free_group_clusters(struct super_block
*sb
,
211 struct ext4_group_desc
*bg
)
213 return le16_to_cpu(bg
->bg_free_blocks_count_lo
) |
214 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
215 (__u32
)le16_to_cpu(bg
->bg_free_blocks_count_hi
) << 16 : 0);
218 __u32
ext4_free_inodes_count(struct super_block
*sb
,
219 struct ext4_group_desc
*bg
)
221 return le16_to_cpu(bg
->bg_free_inodes_count_lo
) |
222 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
223 (__u32
)le16_to_cpu(bg
->bg_free_inodes_count_hi
) << 16 : 0);
226 __u32
ext4_used_dirs_count(struct super_block
*sb
,
227 struct ext4_group_desc
*bg
)
229 return le16_to_cpu(bg
->bg_used_dirs_count_lo
) |
230 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
231 (__u32
)le16_to_cpu(bg
->bg_used_dirs_count_hi
) << 16 : 0);
234 __u32
ext4_itable_unused_count(struct super_block
*sb
,
235 struct ext4_group_desc
*bg
)
237 return le16_to_cpu(bg
->bg_itable_unused_lo
) |
238 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
239 (__u32
)le16_to_cpu(bg
->bg_itable_unused_hi
) << 16 : 0);
242 void ext4_block_bitmap_set(struct super_block
*sb
,
243 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
245 bg
->bg_block_bitmap_lo
= cpu_to_le32((u32
)blk
);
246 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
247 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
250 void ext4_inode_bitmap_set(struct super_block
*sb
,
251 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
253 bg
->bg_inode_bitmap_lo
= cpu_to_le32((u32
)blk
);
254 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
255 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
258 void ext4_inode_table_set(struct super_block
*sb
,
259 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
261 bg
->bg_inode_table_lo
= cpu_to_le32((u32
)blk
);
262 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
263 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
266 void ext4_free_group_clusters_set(struct super_block
*sb
,
267 struct ext4_group_desc
*bg
, __u32 count
)
269 bg
->bg_free_blocks_count_lo
= cpu_to_le16((__u16
)count
);
270 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
271 bg
->bg_free_blocks_count_hi
= cpu_to_le16(count
>> 16);
274 void ext4_free_inodes_set(struct super_block
*sb
,
275 struct ext4_group_desc
*bg
, __u32 count
)
277 bg
->bg_free_inodes_count_lo
= cpu_to_le16((__u16
)count
);
278 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
279 bg
->bg_free_inodes_count_hi
= cpu_to_le16(count
>> 16);
282 void ext4_used_dirs_set(struct super_block
*sb
,
283 struct ext4_group_desc
*bg
, __u32 count
)
285 bg
->bg_used_dirs_count_lo
= cpu_to_le16((__u16
)count
);
286 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
287 bg
->bg_used_dirs_count_hi
= cpu_to_le16(count
>> 16);
290 void ext4_itable_unused_set(struct super_block
*sb
,
291 struct ext4_group_desc
*bg
, __u32 count
)
293 bg
->bg_itable_unused_lo
= cpu_to_le16((__u16
)count
);
294 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
295 bg
->bg_itable_unused_hi
= cpu_to_le16(count
>> 16);
299 /* Just increment the non-pointer handle value */
300 static handle_t
*ext4_get_nojournal(void)
302 handle_t
*handle
= current
->journal_info
;
303 unsigned long ref_cnt
= (unsigned long)handle
;
305 BUG_ON(ref_cnt
>= EXT4_NOJOURNAL_MAX_REF_COUNT
);
308 handle
= (handle_t
*)ref_cnt
;
310 current
->journal_info
= handle
;
315 /* Decrement the non-pointer handle value */
316 static void ext4_put_nojournal(handle_t
*handle
)
318 unsigned long ref_cnt
= (unsigned long)handle
;
320 BUG_ON(ref_cnt
== 0);
323 handle
= (handle_t
*)ref_cnt
;
325 current
->journal_info
= handle
;
329 * Wrappers for jbd2_journal_start/end.
331 handle_t
*ext4_journal_start_sb(struct super_block
*sb
, int nblocks
)
335 trace_ext4_journal_start(sb
, nblocks
, _RET_IP_
);
336 if (sb
->s_flags
& MS_RDONLY
)
337 return ERR_PTR(-EROFS
);
339 WARN_ON(sb
->s_writers
.frozen
== SB_FREEZE_COMPLETE
);
340 journal
= EXT4_SB(sb
)->s_journal
;
342 return ext4_get_nojournal();
344 * Special case here: if the journal has aborted behind our
345 * backs (eg. EIO in the commit thread), then we still need to
346 * take the FS itself readonly cleanly.
348 if (is_journal_aborted(journal
)) {
349 ext4_abort(sb
, "Detected aborted journal");
350 return ERR_PTR(-EROFS
);
352 return jbd2_journal_start(journal
, nblocks
);
355 int __ext4_journal_stop(const char *where
, unsigned int line
, handle_t
*handle
)
357 struct super_block
*sb
;
361 if (!ext4_handle_valid(handle
)) {
362 ext4_put_nojournal(handle
);
365 sb
= handle
->h_transaction
->t_journal
->j_private
;
367 rc
= jbd2_journal_stop(handle
);
372 __ext4_std_error(sb
, where
, line
, err
);
376 void ext4_journal_abort_handle(const char *caller
, unsigned int line
,
377 const char *err_fn
, struct buffer_head
*bh
,
378 handle_t
*handle
, int err
)
381 const char *errstr
= ext4_decode_error(NULL
, err
, nbuf
);
383 BUG_ON(!ext4_handle_valid(handle
));
386 BUFFER_TRACE(bh
, "abort");
391 if (is_handle_aborted(handle
))
394 printk(KERN_ERR
"EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
395 caller
, line
, errstr
, err_fn
);
397 jbd2_journal_abort_handle(handle
);
400 static void __save_error_info(struct super_block
*sb
, const char *func
,
403 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
405 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
406 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
407 es
->s_last_error_time
= cpu_to_le32(get_seconds());
408 strncpy(es
->s_last_error_func
, func
, sizeof(es
->s_last_error_func
));
409 es
->s_last_error_line
= cpu_to_le32(line
);
410 if (!es
->s_first_error_time
) {
411 es
->s_first_error_time
= es
->s_last_error_time
;
412 strncpy(es
->s_first_error_func
, func
,
413 sizeof(es
->s_first_error_func
));
414 es
->s_first_error_line
= cpu_to_le32(line
);
415 es
->s_first_error_ino
= es
->s_last_error_ino
;
416 es
->s_first_error_block
= es
->s_last_error_block
;
419 * Start the daily error reporting function if it hasn't been
422 if (!es
->s_error_count
)
423 mod_timer(&EXT4_SB(sb
)->s_err_report
, jiffies
+ 24*60*60*HZ
);
424 le32_add_cpu(&es
->s_error_count
, 1);
427 static void save_error_info(struct super_block
*sb
, const char *func
,
430 __save_error_info(sb
, func
, line
);
431 ext4_commit_super(sb
, 1);
435 * The del_gendisk() function uninitializes the disk-specific data
436 * structures, including the bdi structure, without telling anyone
437 * else. Once this happens, any attempt to call mark_buffer_dirty()
438 * (for example, by ext4_commit_super), will cause a kernel OOPS.
439 * This is a kludge to prevent these oops until we can put in a proper
440 * hook in del_gendisk() to inform the VFS and file system layers.
442 static int block_device_ejected(struct super_block
*sb
)
444 struct inode
*bd_inode
= sb
->s_bdev
->bd_inode
;
445 struct backing_dev_info
*bdi
= bd_inode
->i_mapping
->backing_dev_info
;
447 return bdi
->dev
== NULL
;
450 static void ext4_journal_commit_callback(journal_t
*journal
, transaction_t
*txn
)
452 struct super_block
*sb
= journal
->j_private
;
453 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
454 int error
= is_journal_aborted(journal
);
455 struct ext4_journal_cb_entry
*jce
, *tmp
;
457 spin_lock(&sbi
->s_md_lock
);
458 list_for_each_entry_safe(jce
, tmp
, &txn
->t_private_list
, jce_list
) {
459 list_del_init(&jce
->jce_list
);
460 spin_unlock(&sbi
->s_md_lock
);
461 jce
->jce_func(sb
, jce
, error
);
462 spin_lock(&sbi
->s_md_lock
);
464 spin_unlock(&sbi
->s_md_lock
);
467 /* Deal with the reporting of failure conditions on a filesystem such as
468 * inconsistencies detected or read IO failures.
470 * On ext2, we can store the error state of the filesystem in the
471 * superblock. That is not possible on ext4, because we may have other
472 * write ordering constraints on the superblock which prevent us from
473 * writing it out straight away; and given that the journal is about to
474 * be aborted, we can't rely on the current, or future, transactions to
475 * write out the superblock safely.
477 * We'll just use the jbd2_journal_abort() error code to record an error in
478 * the journal instead. On recovery, the journal will complain about
479 * that error until we've noted it down and cleared it.
482 static void ext4_handle_error(struct super_block
*sb
)
484 if (sb
->s_flags
& MS_RDONLY
)
487 if (!test_opt(sb
, ERRORS_CONT
)) {
488 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
490 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
492 jbd2_journal_abort(journal
, -EIO
);
494 if (test_opt(sb
, ERRORS_RO
)) {
495 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
496 sb
->s_flags
|= MS_RDONLY
;
498 if (test_opt(sb
, ERRORS_PANIC
))
499 panic("EXT4-fs (device %s): panic forced after error\n",
503 void __ext4_error(struct super_block
*sb
, const char *function
,
504 unsigned int line
, const char *fmt
, ...)
506 struct va_format vaf
;
512 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
513 sb
->s_id
, function
, line
, current
->comm
, &vaf
);
515 save_error_info(sb
, function
, line
);
517 ext4_handle_error(sb
);
520 void ext4_error_inode(struct inode
*inode
, const char *function
,
521 unsigned int line
, ext4_fsblk_t block
,
522 const char *fmt
, ...)
525 struct va_format vaf
;
526 struct ext4_super_block
*es
= EXT4_SB(inode
->i_sb
)->s_es
;
528 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
529 es
->s_last_error_block
= cpu_to_le64(block
);
530 save_error_info(inode
->i_sb
, function
, line
);
535 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
536 "inode #%lu: block %llu: comm %s: %pV\n",
537 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
538 block
, current
->comm
, &vaf
);
540 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
541 "inode #%lu: comm %s: %pV\n",
542 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
543 current
->comm
, &vaf
);
546 ext4_handle_error(inode
->i_sb
);
549 void ext4_error_file(struct file
*file
, const char *function
,
550 unsigned int line
, ext4_fsblk_t block
,
551 const char *fmt
, ...)
554 struct va_format vaf
;
555 struct ext4_super_block
*es
;
556 struct inode
*inode
= file
->f_dentry
->d_inode
;
557 char pathname
[80], *path
;
559 es
= EXT4_SB(inode
->i_sb
)->s_es
;
560 es
->s_last_error_ino
= cpu_to_le32(inode
->i_ino
);
561 save_error_info(inode
->i_sb
, function
, line
);
562 path
= d_path(&(file
->f_path
), pathname
, sizeof(pathname
));
570 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
571 "block %llu: comm %s: path %s: %pV\n",
572 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
573 block
, current
->comm
, path
, &vaf
);
576 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
577 "comm %s: path %s: %pV\n",
578 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
579 current
->comm
, path
, &vaf
);
582 ext4_handle_error(inode
->i_sb
);
585 static const char *ext4_decode_error(struct super_block
*sb
, int errno
,
592 errstr
= "IO failure";
595 errstr
= "Out of memory";
598 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
599 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
600 errstr
= "Journal has aborted";
602 errstr
= "Readonly filesystem";
605 /* If the caller passed in an extra buffer for unknown
606 * errors, textualise them now. Else we just return
609 /* Check for truncated error codes... */
610 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
619 /* __ext4_std_error decodes expected errors from journaling functions
620 * automatically and invokes the appropriate error response. */
622 void __ext4_std_error(struct super_block
*sb
, const char *function
,
623 unsigned int line
, int errno
)
628 /* Special case: if the error is EROFS, and we're not already
629 * inside a transaction, then there's really no point in logging
631 if (errno
== -EROFS
&& journal_current_handle() == NULL
&&
632 (sb
->s_flags
& MS_RDONLY
))
635 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
636 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s:%d: %s\n",
637 sb
->s_id
, function
, line
, errstr
);
638 save_error_info(sb
, function
, line
);
640 ext4_handle_error(sb
);
644 * ext4_abort is a much stronger failure handler than ext4_error. The
645 * abort function may be used to deal with unrecoverable failures such
646 * as journal IO errors or ENOMEM at a critical moment in log management.
648 * We unconditionally force the filesystem into an ABORT|READONLY state,
649 * unless the error response on the fs has been set to panic in which
650 * case we take the easy way out and panic immediately.
653 void __ext4_abort(struct super_block
*sb
, const char *function
,
654 unsigned int line
, const char *fmt
, ...)
658 save_error_info(sb
, function
, line
);
660 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: ", sb
->s_id
,
666 if ((sb
->s_flags
& MS_RDONLY
) == 0) {
667 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
668 sb
->s_flags
|= MS_RDONLY
;
669 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
670 if (EXT4_SB(sb
)->s_journal
)
671 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
672 save_error_info(sb
, function
, line
);
674 if (test_opt(sb
, ERRORS_PANIC
))
675 panic("EXT4-fs panic from previous error\n");
678 void ext4_msg(struct super_block
*sb
, const char *prefix
, const char *fmt
, ...)
680 struct va_format vaf
;
686 printk("%sEXT4-fs (%s): %pV\n", prefix
, sb
->s_id
, &vaf
);
690 void __ext4_warning(struct super_block
*sb
, const char *function
,
691 unsigned int line
, const char *fmt
, ...)
693 struct va_format vaf
;
699 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: %pV\n",
700 sb
->s_id
, function
, line
, &vaf
);
704 void __ext4_grp_locked_error(const char *function
, unsigned int line
,
705 struct super_block
*sb
, ext4_group_t grp
,
706 unsigned long ino
, ext4_fsblk_t block
,
707 const char *fmt
, ...)
711 struct va_format vaf
;
713 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
715 es
->s_last_error_ino
= cpu_to_le32(ino
);
716 es
->s_last_error_block
= cpu_to_le64(block
);
717 __save_error_info(sb
, function
, line
);
723 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: group %u, ",
724 sb
->s_id
, function
, line
, grp
);
726 printk(KERN_CONT
"inode %lu: ", ino
);
728 printk(KERN_CONT
"block %llu:", (unsigned long long) block
);
729 printk(KERN_CONT
"%pV\n", &vaf
);
732 if (test_opt(sb
, ERRORS_CONT
)) {
733 ext4_commit_super(sb
, 0);
737 ext4_unlock_group(sb
, grp
);
738 ext4_handle_error(sb
);
740 * We only get here in the ERRORS_RO case; relocking the group
741 * may be dangerous, but nothing bad will happen since the
742 * filesystem will have already been marked read/only and the
743 * journal has been aborted. We return 1 as a hint to callers
744 * who might what to use the return value from
745 * ext4_grp_locked_error() to distinguish between the
746 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
747 * aggressively from the ext4 function in question, with a
748 * more appropriate error code.
750 ext4_lock_group(sb
, grp
);
754 void ext4_update_dynamic_rev(struct super_block
*sb
)
756 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
758 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
762 "updating to rev %d because of new feature flag, "
763 "running e2fsck is recommended",
766 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
767 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
768 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
769 /* leave es->s_feature_*compat flags alone */
770 /* es->s_uuid will be set by e2fsck if empty */
773 * The rest of the superblock fields should be zero, and if not it
774 * means they are likely already in use, so leave them alone. We
775 * can leave it up to e2fsck to clean up any inconsistencies there.
780 * Open the external journal device
782 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
784 struct block_device
*bdev
;
785 char b
[BDEVNAME_SIZE
];
787 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
, sb
);
793 ext4_msg(sb
, KERN_ERR
, "failed to open journal device %s: %ld",
794 __bdevname(dev
, b
), PTR_ERR(bdev
));
799 * Release the journal device
801 static int ext4_blkdev_put(struct block_device
*bdev
)
803 return blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
806 static int ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
808 struct block_device
*bdev
;
811 bdev
= sbi
->journal_bdev
;
813 ret
= ext4_blkdev_put(bdev
);
814 sbi
->journal_bdev
= NULL
;
819 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
821 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
824 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
828 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
829 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
831 printk(KERN_ERR
"sb_info orphan list:\n");
832 list_for_each(l
, &sbi
->s_orphan
) {
833 struct inode
*inode
= orphan_list_entry(l
);
835 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
836 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
837 inode
->i_mode
, inode
->i_nlink
,
842 static void ext4_put_super(struct super_block
*sb
)
844 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
845 struct ext4_super_block
*es
= sbi
->s_es
;
848 ext4_unregister_li_request(sb
);
849 dquot_disable(sb
, -1, DQUOT_USAGE_ENABLED
| DQUOT_LIMITS_ENABLED
);
851 flush_workqueue(sbi
->dio_unwritten_wq
);
852 destroy_workqueue(sbi
->dio_unwritten_wq
);
854 if (sbi
->s_journal
) {
855 err
= jbd2_journal_destroy(sbi
->s_journal
);
856 sbi
->s_journal
= NULL
;
858 ext4_abort(sb
, "Couldn't clean up the journal");
861 del_timer(&sbi
->s_err_report
);
862 ext4_release_system_zone(sb
);
864 ext4_ext_release(sb
);
865 ext4_xattr_put_super(sb
);
867 if (!(sb
->s_flags
& MS_RDONLY
)) {
868 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
869 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
871 if (!(sb
->s_flags
& MS_RDONLY
))
872 ext4_commit_super(sb
, 1);
875 remove_proc_entry("options", sbi
->s_proc
);
876 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
878 kobject_del(&sbi
->s_kobj
);
880 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
881 brelse(sbi
->s_group_desc
[i
]);
882 ext4_kvfree(sbi
->s_group_desc
);
883 ext4_kvfree(sbi
->s_flex_groups
);
884 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
885 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
886 percpu_counter_destroy(&sbi
->s_dirs_counter
);
887 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
890 for (i
= 0; i
< MAXQUOTAS
; i
++)
891 kfree(sbi
->s_qf_names
[i
]);
894 /* Debugging code just in case the in-memory inode orphan list
895 * isn't empty. The on-disk one can be non-empty if we've
896 * detected an error and taken the fs readonly, but the
897 * in-memory list had better be clean by this point. */
898 if (!list_empty(&sbi
->s_orphan
))
899 dump_orphan_list(sb
, sbi
);
900 J_ASSERT(list_empty(&sbi
->s_orphan
));
902 invalidate_bdev(sb
->s_bdev
);
903 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
905 * Invalidate the journal device's buffers. We don't want them
906 * floating about in memory - the physical journal device may
907 * hotswapped, and it breaks the `ro-after' testing code.
909 sync_blockdev(sbi
->journal_bdev
);
910 invalidate_bdev(sbi
->journal_bdev
);
911 ext4_blkdev_remove(sbi
);
914 kthread_stop(sbi
->s_mmp_tsk
);
915 sb
->s_fs_info
= NULL
;
917 * Now that we are completely done shutting down the
918 * superblock, we need to actually destroy the kobject.
920 kobject_put(&sbi
->s_kobj
);
921 wait_for_completion(&sbi
->s_kobj_unregister
);
922 if (sbi
->s_chksum_driver
)
923 crypto_free_shash(sbi
->s_chksum_driver
);
924 kfree(sbi
->s_blockgroup_lock
);
928 static struct kmem_cache
*ext4_inode_cachep
;
931 * Called inside transaction, so use GFP_NOFS
933 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
935 struct ext4_inode_info
*ei
;
937 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
941 ei
->vfs_inode
.i_version
= 1;
942 memset(&ei
->i_cached_extent
, 0, sizeof(struct ext4_ext_cache
));
943 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
944 spin_lock_init(&ei
->i_prealloc_lock
);
945 ext4_es_init_tree(&ei
->i_es_tree
);
946 rwlock_init(&ei
->i_es_lock
);
947 ei
->i_reserved_data_blocks
= 0;
948 ei
->i_reserved_meta_blocks
= 0;
949 ei
->i_allocated_meta_blocks
= 0;
950 ei
->i_da_metadata_calc_len
= 0;
951 ei
->i_da_metadata_calc_last_lblock
= 0;
952 spin_lock_init(&(ei
->i_block_reservation_lock
));
954 ei
->i_reserved_quota
= 0;
957 INIT_LIST_HEAD(&ei
->i_completed_io_list
);
958 spin_lock_init(&ei
->i_completed_io_lock
);
960 ei
->i_datasync_tid
= 0;
961 atomic_set(&ei
->i_ioend_count
, 0);
962 atomic_set(&ei
->i_unwritten
, 0);
964 return &ei
->vfs_inode
;
967 static int ext4_drop_inode(struct inode
*inode
)
969 int drop
= generic_drop_inode(inode
);
971 trace_ext4_drop_inode(inode
, drop
);
975 static void ext4_i_callback(struct rcu_head
*head
)
977 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
978 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
981 static void ext4_destroy_inode(struct inode
*inode
)
983 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
984 ext4_msg(inode
->i_sb
, KERN_ERR
,
985 "Inode %lu (%p): orphan list check failed!",
986 inode
->i_ino
, EXT4_I(inode
));
987 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
988 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
992 call_rcu(&inode
->i_rcu
, ext4_i_callback
);
995 static void init_once(void *foo
)
997 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
999 INIT_LIST_HEAD(&ei
->i_orphan
);
1000 init_rwsem(&ei
->xattr_sem
);
1001 init_rwsem(&ei
->i_data_sem
);
1002 inode_init_once(&ei
->vfs_inode
);
1005 static int init_inodecache(void)
1007 ext4_inode_cachep
= kmem_cache_create("ext4_inode_cache",
1008 sizeof(struct ext4_inode_info
),
1009 0, (SLAB_RECLAIM_ACCOUNT
|
1012 if (ext4_inode_cachep
== NULL
)
1017 static void destroy_inodecache(void)
1020 * Make sure all delayed rcu free inodes are flushed before we
1024 kmem_cache_destroy(ext4_inode_cachep
);
1027 void ext4_clear_inode(struct inode
*inode
)
1029 invalidate_inode_buffers(inode
);
1032 ext4_discard_preallocations(inode
);
1033 ext4_es_remove_extent(inode
, 0, EXT_MAX_BLOCKS
);
1034 if (EXT4_I(inode
)->jinode
) {
1035 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode
),
1036 EXT4_I(inode
)->jinode
);
1037 jbd2_free_inode(EXT4_I(inode
)->jinode
);
1038 EXT4_I(inode
)->jinode
= NULL
;
1042 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
1043 u64 ino
, u32 generation
)
1045 struct inode
*inode
;
1047 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
1048 return ERR_PTR(-ESTALE
);
1049 if (ino
> le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
))
1050 return ERR_PTR(-ESTALE
);
1052 /* iget isn't really right if the inode is currently unallocated!!
1054 * ext4_read_inode will return a bad_inode if the inode had been
1055 * deleted, so we should be safe.
1057 * Currently we don't know the generation for parent directory, so
1058 * a generation of 0 means "accept any"
1060 inode
= ext4_iget(sb
, ino
);
1062 return ERR_CAST(inode
);
1063 if (generation
&& inode
->i_generation
!= generation
) {
1065 return ERR_PTR(-ESTALE
);
1071 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
1072 int fh_len
, int fh_type
)
1074 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
1075 ext4_nfs_get_inode
);
1078 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
1079 int fh_len
, int fh_type
)
1081 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
1082 ext4_nfs_get_inode
);
1086 * Try to release metadata pages (indirect blocks, directories) which are
1087 * mapped via the block device. Since these pages could have journal heads
1088 * which would prevent try_to_free_buffers() from freeing them, we must use
1089 * jbd2 layer's try_to_free_buffers() function to release them.
1091 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
1094 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
1096 WARN_ON(PageChecked(page
));
1097 if (!page_has_buffers(page
))
1100 return jbd2_journal_try_to_free_buffers(journal
, page
,
1101 wait
& ~__GFP_WAIT
);
1102 return try_to_free_buffers(page
);
1106 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1107 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1109 static int ext4_write_dquot(struct dquot
*dquot
);
1110 static int ext4_acquire_dquot(struct dquot
*dquot
);
1111 static int ext4_release_dquot(struct dquot
*dquot
);
1112 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1113 static int ext4_write_info(struct super_block
*sb
, int type
);
1114 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1116 static int ext4_quota_on_sysfile(struct super_block
*sb
, int type
,
1118 static int ext4_quota_off(struct super_block
*sb
, int type
);
1119 static int ext4_quota_off_sysfile(struct super_block
*sb
, int type
);
1120 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1121 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1122 size_t len
, loff_t off
);
1123 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1124 const char *data
, size_t len
, loff_t off
);
1125 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
1126 unsigned int flags
);
1127 static int ext4_enable_quotas(struct super_block
*sb
);
1129 static const struct dquot_operations ext4_quota_operations
= {
1130 .get_reserved_space
= ext4_get_reserved_space
,
1131 .write_dquot
= ext4_write_dquot
,
1132 .acquire_dquot
= ext4_acquire_dquot
,
1133 .release_dquot
= ext4_release_dquot
,
1134 .mark_dirty
= ext4_mark_dquot_dirty
,
1135 .write_info
= ext4_write_info
,
1136 .alloc_dquot
= dquot_alloc
,
1137 .destroy_dquot
= dquot_destroy
,
1140 static const struct quotactl_ops ext4_qctl_operations
= {
1141 .quota_on
= ext4_quota_on
,
1142 .quota_off
= ext4_quota_off
,
1143 .quota_sync
= dquot_quota_sync
,
1144 .get_info
= dquot_get_dqinfo
,
1145 .set_info
= dquot_set_dqinfo
,
1146 .get_dqblk
= dquot_get_dqblk
,
1147 .set_dqblk
= dquot_set_dqblk
1150 static const struct quotactl_ops ext4_qctl_sysfile_operations
= {
1151 .quota_on_meta
= ext4_quota_on_sysfile
,
1152 .quota_off
= ext4_quota_off_sysfile
,
1153 .quota_sync
= dquot_quota_sync
,
1154 .get_info
= dquot_get_dqinfo
,
1155 .set_info
= dquot_set_dqinfo
,
1156 .get_dqblk
= dquot_get_dqblk
,
1157 .set_dqblk
= dquot_set_dqblk
1161 static const struct super_operations ext4_sops
= {
1162 .alloc_inode
= ext4_alloc_inode
,
1163 .destroy_inode
= ext4_destroy_inode
,
1164 .write_inode
= ext4_write_inode
,
1165 .dirty_inode
= ext4_dirty_inode
,
1166 .drop_inode
= ext4_drop_inode
,
1167 .evict_inode
= ext4_evict_inode
,
1168 .put_super
= ext4_put_super
,
1169 .sync_fs
= ext4_sync_fs
,
1170 .freeze_fs
= ext4_freeze
,
1171 .unfreeze_fs
= ext4_unfreeze
,
1172 .statfs
= ext4_statfs
,
1173 .remount_fs
= ext4_remount
,
1174 .show_options
= ext4_show_options
,
1176 .quota_read
= ext4_quota_read
,
1177 .quota_write
= ext4_quota_write
,
1179 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1182 static const struct super_operations ext4_nojournal_sops
= {
1183 .alloc_inode
= ext4_alloc_inode
,
1184 .destroy_inode
= ext4_destroy_inode
,
1185 .write_inode
= ext4_write_inode
,
1186 .dirty_inode
= ext4_dirty_inode
,
1187 .drop_inode
= ext4_drop_inode
,
1188 .evict_inode
= ext4_evict_inode
,
1189 .put_super
= ext4_put_super
,
1190 .statfs
= ext4_statfs
,
1191 .remount_fs
= ext4_remount
,
1192 .show_options
= ext4_show_options
,
1194 .quota_read
= ext4_quota_read
,
1195 .quota_write
= ext4_quota_write
,
1197 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1200 static const struct export_operations ext4_export_ops
= {
1201 .fh_to_dentry
= ext4_fh_to_dentry
,
1202 .fh_to_parent
= ext4_fh_to_parent
,
1203 .get_parent
= ext4_get_parent
,
1207 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1208 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1209 Opt_nouid32
, Opt_debug
, Opt_removed
,
1210 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1211 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
,
1212 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
,
1213 Opt_journal_dev
, Opt_journal_checksum
, Opt_journal_async_commit
,
1214 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1215 Opt_data_err_abort
, Opt_data_err_ignore
,
1216 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1217 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1218 Opt_noquota
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1219 Opt_usrquota
, Opt_grpquota
, Opt_i_version
,
1220 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
, Opt_mblk_io_submit
,
1221 Opt_nomblk_io_submit
, Opt_block_validity
, Opt_noblock_validity
,
1222 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1223 Opt_dioread_nolock
, Opt_dioread_lock
,
1224 Opt_discard
, Opt_nodiscard
, Opt_init_itable
, Opt_noinit_itable
,
1225 Opt_max_dir_size_kb
,
1228 static const match_table_t tokens
= {
1229 {Opt_bsd_df
, "bsddf"},
1230 {Opt_minix_df
, "minixdf"},
1231 {Opt_grpid
, "grpid"},
1232 {Opt_grpid
, "bsdgroups"},
1233 {Opt_nogrpid
, "nogrpid"},
1234 {Opt_nogrpid
, "sysvgroups"},
1235 {Opt_resgid
, "resgid=%u"},
1236 {Opt_resuid
, "resuid=%u"},
1238 {Opt_err_cont
, "errors=continue"},
1239 {Opt_err_panic
, "errors=panic"},
1240 {Opt_err_ro
, "errors=remount-ro"},
1241 {Opt_nouid32
, "nouid32"},
1242 {Opt_debug
, "debug"},
1243 {Opt_removed
, "oldalloc"},
1244 {Opt_removed
, "orlov"},
1245 {Opt_user_xattr
, "user_xattr"},
1246 {Opt_nouser_xattr
, "nouser_xattr"},
1248 {Opt_noacl
, "noacl"},
1249 {Opt_noload
, "norecovery"},
1250 {Opt_noload
, "noload"},
1251 {Opt_removed
, "nobh"},
1252 {Opt_removed
, "bh"},
1253 {Opt_commit
, "commit=%u"},
1254 {Opt_min_batch_time
, "min_batch_time=%u"},
1255 {Opt_max_batch_time
, "max_batch_time=%u"},
1256 {Opt_journal_dev
, "journal_dev=%u"},
1257 {Opt_journal_checksum
, "journal_checksum"},
1258 {Opt_journal_async_commit
, "journal_async_commit"},
1259 {Opt_abort
, "abort"},
1260 {Opt_data_journal
, "data=journal"},
1261 {Opt_data_ordered
, "data=ordered"},
1262 {Opt_data_writeback
, "data=writeback"},
1263 {Opt_data_err_abort
, "data_err=abort"},
1264 {Opt_data_err_ignore
, "data_err=ignore"},
1265 {Opt_offusrjquota
, "usrjquota="},
1266 {Opt_usrjquota
, "usrjquota=%s"},
1267 {Opt_offgrpjquota
, "grpjquota="},
1268 {Opt_grpjquota
, "grpjquota=%s"},
1269 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1270 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1271 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1272 {Opt_grpquota
, "grpquota"},
1273 {Opt_noquota
, "noquota"},
1274 {Opt_quota
, "quota"},
1275 {Opt_usrquota
, "usrquota"},
1276 {Opt_barrier
, "barrier=%u"},
1277 {Opt_barrier
, "barrier"},
1278 {Opt_nobarrier
, "nobarrier"},
1279 {Opt_i_version
, "i_version"},
1280 {Opt_stripe
, "stripe=%u"},
1281 {Opt_delalloc
, "delalloc"},
1282 {Opt_nodelalloc
, "nodelalloc"},
1283 {Opt_mblk_io_submit
, "mblk_io_submit"},
1284 {Opt_nomblk_io_submit
, "nomblk_io_submit"},
1285 {Opt_block_validity
, "block_validity"},
1286 {Opt_noblock_validity
, "noblock_validity"},
1287 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1288 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1289 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1290 {Opt_auto_da_alloc
, "auto_da_alloc"},
1291 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1292 {Opt_dioread_nolock
, "dioread_nolock"},
1293 {Opt_dioread_lock
, "dioread_lock"},
1294 {Opt_discard
, "discard"},
1295 {Opt_nodiscard
, "nodiscard"},
1296 {Opt_init_itable
, "init_itable=%u"},
1297 {Opt_init_itable
, "init_itable"},
1298 {Opt_noinit_itable
, "noinit_itable"},
1299 {Opt_max_dir_size_kb
, "max_dir_size_kb=%u"},
1300 {Opt_removed
, "check=none"}, /* mount option from ext2/3 */
1301 {Opt_removed
, "nocheck"}, /* mount option from ext2/3 */
1302 {Opt_removed
, "reservation"}, /* mount option from ext2/3 */
1303 {Opt_removed
, "noreservation"}, /* mount option from ext2/3 */
1304 {Opt_removed
, "journal=%u"}, /* mount option from ext2/3 */
1308 static ext4_fsblk_t
get_sb_block(void **data
)
1310 ext4_fsblk_t sb_block
;
1311 char *options
= (char *) *data
;
1313 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1314 return 1; /* Default location */
1317 /* TODO: use simple_strtoll with >32bit ext4 */
1318 sb_block
= simple_strtoul(options
, &options
, 0);
1319 if (*options
&& *options
!= ',') {
1320 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1324 if (*options
== ',')
1326 *data
= (void *) options
;
1331 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1332 static char deprecated_msg
[] = "Mount option \"%s\" will be removed by %s\n"
1333 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1336 static int set_qf_name(struct super_block
*sb
, int qtype
, substring_t
*args
)
1338 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1341 if (sb_any_quota_loaded(sb
) &&
1342 !sbi
->s_qf_names
[qtype
]) {
1343 ext4_msg(sb
, KERN_ERR
,
1344 "Cannot change journaled "
1345 "quota options when quota turned on");
1348 qname
= match_strdup(args
);
1350 ext4_msg(sb
, KERN_ERR
,
1351 "Not enough memory for storing quotafile name");
1354 if (sbi
->s_qf_names
[qtype
] &&
1355 strcmp(sbi
->s_qf_names
[qtype
], qname
)) {
1356 ext4_msg(sb
, KERN_ERR
,
1357 "%s quota file already specified", QTYPE2NAME(qtype
));
1361 sbi
->s_qf_names
[qtype
] = qname
;
1362 if (strchr(sbi
->s_qf_names
[qtype
], '/')) {
1363 ext4_msg(sb
, KERN_ERR
,
1364 "quotafile must be on filesystem root");
1365 kfree(sbi
->s_qf_names
[qtype
]);
1366 sbi
->s_qf_names
[qtype
] = NULL
;
1373 static int clear_qf_name(struct super_block
*sb
, int qtype
)
1376 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1378 if (sb_any_quota_loaded(sb
) &&
1379 sbi
->s_qf_names
[qtype
]) {
1380 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled quota options"
1381 " when quota turned on");
1385 * The space will be released later when all options are confirmed
1388 sbi
->s_qf_names
[qtype
] = NULL
;
1393 #define MOPT_SET 0x0001
1394 #define MOPT_CLEAR 0x0002
1395 #define MOPT_NOSUPPORT 0x0004
1396 #define MOPT_EXPLICIT 0x0008
1397 #define MOPT_CLEAR_ERR 0x0010
1398 #define MOPT_GTE0 0x0020
1401 #define MOPT_QFMT 0x0040
1403 #define MOPT_Q MOPT_NOSUPPORT
1404 #define MOPT_QFMT MOPT_NOSUPPORT
1406 #define MOPT_DATAJ 0x0080
1408 static const struct mount_opts
{
1412 } ext4_mount_opts
[] = {
1413 {Opt_minix_df
, EXT4_MOUNT_MINIX_DF
, MOPT_SET
},
1414 {Opt_bsd_df
, EXT4_MOUNT_MINIX_DF
, MOPT_CLEAR
},
1415 {Opt_grpid
, EXT4_MOUNT_GRPID
, MOPT_SET
},
1416 {Opt_nogrpid
, EXT4_MOUNT_GRPID
, MOPT_CLEAR
},
1417 {Opt_mblk_io_submit
, EXT4_MOUNT_MBLK_IO_SUBMIT
, MOPT_SET
},
1418 {Opt_nomblk_io_submit
, EXT4_MOUNT_MBLK_IO_SUBMIT
, MOPT_CLEAR
},
1419 {Opt_block_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_SET
},
1420 {Opt_noblock_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_CLEAR
},
1421 {Opt_dioread_nolock
, EXT4_MOUNT_DIOREAD_NOLOCK
, MOPT_SET
},
1422 {Opt_dioread_lock
, EXT4_MOUNT_DIOREAD_NOLOCK
, MOPT_CLEAR
},
1423 {Opt_discard
, EXT4_MOUNT_DISCARD
, MOPT_SET
},
1424 {Opt_nodiscard
, EXT4_MOUNT_DISCARD
, MOPT_CLEAR
},
1425 {Opt_delalloc
, EXT4_MOUNT_DELALLOC
, MOPT_SET
| MOPT_EXPLICIT
},
1426 {Opt_nodelalloc
, EXT4_MOUNT_DELALLOC
, MOPT_CLEAR
| MOPT_EXPLICIT
},
1427 {Opt_journal_checksum
, EXT4_MOUNT_JOURNAL_CHECKSUM
, MOPT_SET
},
1428 {Opt_journal_async_commit
, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT
|
1429 EXT4_MOUNT_JOURNAL_CHECKSUM
), MOPT_SET
},
1430 {Opt_noload
, EXT4_MOUNT_NOLOAD
, MOPT_SET
},
1431 {Opt_err_panic
, EXT4_MOUNT_ERRORS_PANIC
, MOPT_SET
| MOPT_CLEAR_ERR
},
1432 {Opt_err_ro
, EXT4_MOUNT_ERRORS_RO
, MOPT_SET
| MOPT_CLEAR_ERR
},
1433 {Opt_err_cont
, EXT4_MOUNT_ERRORS_CONT
, MOPT_SET
| MOPT_CLEAR_ERR
},
1434 {Opt_data_err_abort
, EXT4_MOUNT_DATA_ERR_ABORT
, MOPT_SET
},
1435 {Opt_data_err_ignore
, EXT4_MOUNT_DATA_ERR_ABORT
, MOPT_CLEAR
},
1436 {Opt_barrier
, EXT4_MOUNT_BARRIER
, MOPT_SET
},
1437 {Opt_nobarrier
, EXT4_MOUNT_BARRIER
, MOPT_CLEAR
},
1438 {Opt_noauto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_SET
},
1439 {Opt_auto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_CLEAR
},
1440 {Opt_noinit_itable
, EXT4_MOUNT_INIT_INODE_TABLE
, MOPT_CLEAR
},
1441 {Opt_commit
, 0, MOPT_GTE0
},
1442 {Opt_max_batch_time
, 0, MOPT_GTE0
},
1443 {Opt_min_batch_time
, 0, MOPT_GTE0
},
1444 {Opt_inode_readahead_blks
, 0, MOPT_GTE0
},
1445 {Opt_init_itable
, 0, MOPT_GTE0
},
1446 {Opt_stripe
, 0, MOPT_GTE0
},
1447 {Opt_data_journal
, EXT4_MOUNT_JOURNAL_DATA
, MOPT_DATAJ
},
1448 {Opt_data_ordered
, EXT4_MOUNT_ORDERED_DATA
, MOPT_DATAJ
},
1449 {Opt_data_writeback
, EXT4_MOUNT_WRITEBACK_DATA
, MOPT_DATAJ
},
1450 {Opt_user_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_SET
},
1451 {Opt_nouser_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_CLEAR
},
1452 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1453 {Opt_acl
, EXT4_MOUNT_POSIX_ACL
, MOPT_SET
},
1454 {Opt_noacl
, EXT4_MOUNT_POSIX_ACL
, MOPT_CLEAR
},
1456 {Opt_acl
, 0, MOPT_NOSUPPORT
},
1457 {Opt_noacl
, 0, MOPT_NOSUPPORT
},
1459 {Opt_nouid32
, EXT4_MOUNT_NO_UID32
, MOPT_SET
},
1460 {Opt_debug
, EXT4_MOUNT_DEBUG
, MOPT_SET
},
1461 {Opt_quota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
, MOPT_SET
| MOPT_Q
},
1462 {Opt_usrquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
,
1464 {Opt_grpquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_GRPQUOTA
,
1466 {Opt_noquota
, (EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
|
1467 EXT4_MOUNT_GRPQUOTA
), MOPT_CLEAR
| MOPT_Q
},
1468 {Opt_usrjquota
, 0, MOPT_Q
},
1469 {Opt_grpjquota
, 0, MOPT_Q
},
1470 {Opt_offusrjquota
, 0, MOPT_Q
},
1471 {Opt_offgrpjquota
, 0, MOPT_Q
},
1472 {Opt_jqfmt_vfsold
, QFMT_VFS_OLD
, MOPT_QFMT
},
1473 {Opt_jqfmt_vfsv0
, QFMT_VFS_V0
, MOPT_QFMT
},
1474 {Opt_jqfmt_vfsv1
, QFMT_VFS_V1
, MOPT_QFMT
},
1475 {Opt_max_dir_size_kb
, 0, MOPT_GTE0
},
1479 static int handle_mount_opt(struct super_block
*sb
, char *opt
, int token
,
1480 substring_t
*args
, unsigned long *journal_devnum
,
1481 unsigned int *journal_ioprio
, int is_remount
)
1483 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1484 const struct mount_opts
*m
;
1490 if (token
== Opt_usrjquota
)
1491 return set_qf_name(sb
, USRQUOTA
, &args
[0]);
1492 else if (token
== Opt_grpjquota
)
1493 return set_qf_name(sb
, GRPQUOTA
, &args
[0]);
1494 else if (token
== Opt_offusrjquota
)
1495 return clear_qf_name(sb
, USRQUOTA
);
1496 else if (token
== Opt_offgrpjquota
)
1497 return clear_qf_name(sb
, GRPQUOTA
);
1499 if (args
->from
&& match_int(args
, &arg
))
1503 case Opt_nouser_xattr
:
1504 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, opt
, "3.5");
1507 return 1; /* handled by get_sb_block() */
1509 ext4_msg(sb
, KERN_WARNING
,
1510 "Ignoring removed %s option", opt
);
1513 uid
= make_kuid(current_user_ns(), arg
);
1514 if (!uid_valid(uid
)) {
1515 ext4_msg(sb
, KERN_ERR
, "Invalid uid value %d", arg
);
1518 sbi
->s_resuid
= uid
;
1521 gid
= make_kgid(current_user_ns(), arg
);
1522 if (!gid_valid(gid
)) {
1523 ext4_msg(sb
, KERN_ERR
, "Invalid gid value %d", arg
);
1526 sbi
->s_resgid
= gid
;
1529 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1532 sb
->s_flags
|= MS_I_VERSION
;
1534 case Opt_journal_dev
:
1536 ext4_msg(sb
, KERN_ERR
,
1537 "Cannot specify journal on remount");
1540 *journal_devnum
= arg
;
1542 case Opt_journal_ioprio
:
1543 if (arg
< 0 || arg
> 7)
1545 *journal_ioprio
= IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
, arg
);
1549 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++) {
1550 if (token
!= m
->token
)
1552 if (args
->from
&& (m
->flags
& MOPT_GTE0
) && (arg
< 0))
1554 if (m
->flags
& MOPT_EXPLICIT
)
1555 set_opt2(sb
, EXPLICIT_DELALLOC
);
1556 if (m
->flags
& MOPT_CLEAR_ERR
)
1557 clear_opt(sb
, ERRORS_MASK
);
1558 if (token
== Opt_noquota
&& sb_any_quota_loaded(sb
)) {
1559 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1560 "options when quota turned on");
1564 if (m
->flags
& MOPT_NOSUPPORT
) {
1565 ext4_msg(sb
, KERN_ERR
, "%s option not supported", opt
);
1566 } else if (token
== Opt_commit
) {
1568 arg
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1569 sbi
->s_commit_interval
= HZ
* arg
;
1570 } else if (token
== Opt_max_batch_time
) {
1572 arg
= EXT4_DEF_MAX_BATCH_TIME
;
1573 sbi
->s_max_batch_time
= arg
;
1574 } else if (token
== Opt_min_batch_time
) {
1575 sbi
->s_min_batch_time
= arg
;
1576 } else if (token
== Opt_inode_readahead_blks
) {
1577 if (arg
> (1 << 30))
1579 if (arg
&& !is_power_of_2(arg
)) {
1580 ext4_msg(sb
, KERN_ERR
,
1581 "EXT4-fs: inode_readahead_blks"
1582 " must be a power of 2");
1585 sbi
->s_inode_readahead_blks
= arg
;
1586 } else if (token
== Opt_init_itable
) {
1587 set_opt(sb
, INIT_INODE_TABLE
);
1589 arg
= EXT4_DEF_LI_WAIT_MULT
;
1590 sbi
->s_li_wait_mult
= arg
;
1591 } else if (token
== Opt_max_dir_size_kb
) {
1592 sbi
->s_max_dir_size_kb
= arg
;
1593 } else if (token
== Opt_stripe
) {
1594 sbi
->s_stripe
= arg
;
1595 } else if (m
->flags
& MOPT_DATAJ
) {
1597 if (!sbi
->s_journal
)
1598 ext4_msg(sb
, KERN_WARNING
, "Remounting file system with no journal so ignoring journalled data option");
1599 else if (test_opt(sb
, DATA_FLAGS
) !=
1601 ext4_msg(sb
, KERN_ERR
,
1602 "Cannot change data mode on remount");
1606 clear_opt(sb
, DATA_FLAGS
);
1607 sbi
->s_mount_opt
|= m
->mount_opt
;
1610 } else if (m
->flags
& MOPT_QFMT
) {
1611 if (sb_any_quota_loaded(sb
) &&
1612 sbi
->s_jquota_fmt
!= m
->mount_opt
) {
1613 ext4_msg(sb
, KERN_ERR
, "Cannot "
1614 "change journaled quota options "
1615 "when quota turned on");
1618 sbi
->s_jquota_fmt
= m
->mount_opt
;
1623 if (m
->flags
& MOPT_CLEAR
)
1625 else if (unlikely(!(m
->flags
& MOPT_SET
))) {
1626 ext4_msg(sb
, KERN_WARNING
,
1627 "buggy handling of option %s", opt
);
1632 sbi
->s_mount_opt
|= m
->mount_opt
;
1634 sbi
->s_mount_opt
&= ~m
->mount_opt
;
1638 ext4_msg(sb
, KERN_ERR
, "Unrecognized mount option \"%s\" "
1639 "or missing value", opt
);
1643 static int parse_options(char *options
, struct super_block
*sb
,
1644 unsigned long *journal_devnum
,
1645 unsigned int *journal_ioprio
,
1648 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1650 substring_t args
[MAX_OPT_ARGS
];
1656 while ((p
= strsep(&options
, ",")) != NULL
) {
1660 * Initialize args struct so we know whether arg was
1661 * found; some options take optional arguments.
1663 args
[0].to
= args
[0].from
= NULL
;
1664 token
= match_token(p
, tokens
, args
);
1665 if (handle_mount_opt(sb
, p
, token
, args
, journal_devnum
,
1666 journal_ioprio
, is_remount
) < 0)
1670 if (sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
1671 if (test_opt(sb
, USRQUOTA
) && sbi
->s_qf_names
[USRQUOTA
])
1672 clear_opt(sb
, USRQUOTA
);
1674 if (test_opt(sb
, GRPQUOTA
) && sbi
->s_qf_names
[GRPQUOTA
])
1675 clear_opt(sb
, GRPQUOTA
);
1677 if (test_opt(sb
, GRPQUOTA
) || test_opt(sb
, USRQUOTA
)) {
1678 ext4_msg(sb
, KERN_ERR
, "old and new quota "
1683 if (!sbi
->s_jquota_fmt
) {
1684 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1689 if (sbi
->s_jquota_fmt
) {
1690 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
1691 "specified with no journaling "
1697 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
1699 BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
1701 if (blocksize
< PAGE_CACHE_SIZE
) {
1702 ext4_msg(sb
, KERN_ERR
, "can't mount with "
1703 "dioread_nolock if block size != PAGE_SIZE");
1710 static inline void ext4_show_quota_options(struct seq_file
*seq
,
1711 struct super_block
*sb
)
1713 #if defined(CONFIG_QUOTA)
1714 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1716 if (sbi
->s_jquota_fmt
) {
1719 switch (sbi
->s_jquota_fmt
) {
1730 seq_printf(seq
, ",jqfmt=%s", fmtname
);
1733 if (sbi
->s_qf_names
[USRQUOTA
])
1734 seq_printf(seq
, ",usrjquota=%s", sbi
->s_qf_names
[USRQUOTA
]);
1736 if (sbi
->s_qf_names
[GRPQUOTA
])
1737 seq_printf(seq
, ",grpjquota=%s", sbi
->s_qf_names
[GRPQUOTA
]);
1739 if (test_opt(sb
, USRQUOTA
))
1740 seq_puts(seq
, ",usrquota");
1742 if (test_opt(sb
, GRPQUOTA
))
1743 seq_puts(seq
, ",grpquota");
1747 static const char *token2str(int token
)
1749 const struct match_token
*t
;
1751 for (t
= tokens
; t
->token
!= Opt_err
; t
++)
1752 if (t
->token
== token
&& !strchr(t
->pattern
, '='))
1759 * - it's set to a non-default value OR
1760 * - if the per-sb default is different from the global default
1762 static int _ext4_show_options(struct seq_file
*seq
, struct super_block
*sb
,
1765 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1766 struct ext4_super_block
*es
= sbi
->s_es
;
1767 int def_errors
, def_mount_opt
= nodefs
? 0 : sbi
->s_def_mount_opt
;
1768 const struct mount_opts
*m
;
1769 char sep
= nodefs
? '\n' : ',';
1771 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1772 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1774 if (sbi
->s_sb_block
!= 1)
1775 SEQ_OPTS_PRINT("sb=%llu", sbi
->s_sb_block
);
1777 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++) {
1778 int want_set
= m
->flags
& MOPT_SET
;
1779 if (((m
->flags
& (MOPT_SET
|MOPT_CLEAR
)) == 0) ||
1780 (m
->flags
& MOPT_CLEAR_ERR
))
1782 if (!(m
->mount_opt
& (sbi
->s_mount_opt
^ def_mount_opt
)))
1783 continue; /* skip if same as the default */
1785 (sbi
->s_mount_opt
& m
->mount_opt
) != m
->mount_opt
) ||
1786 (!want_set
&& (sbi
->s_mount_opt
& m
->mount_opt
)))
1787 continue; /* select Opt_noFoo vs Opt_Foo */
1788 SEQ_OPTS_PRINT("%s", token2str(m
->token
));
1791 if (nodefs
|| !uid_eq(sbi
->s_resuid
, make_kuid(&init_user_ns
, EXT4_DEF_RESUID
)) ||
1792 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
)
1793 SEQ_OPTS_PRINT("resuid=%u",
1794 from_kuid_munged(&init_user_ns
, sbi
->s_resuid
));
1795 if (nodefs
|| !gid_eq(sbi
->s_resgid
, make_kgid(&init_user_ns
, EXT4_DEF_RESGID
)) ||
1796 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
)
1797 SEQ_OPTS_PRINT("resgid=%u",
1798 from_kgid_munged(&init_user_ns
, sbi
->s_resgid
));
1799 def_errors
= nodefs
? -1 : le16_to_cpu(es
->s_errors
);
1800 if (test_opt(sb
, ERRORS_RO
) && def_errors
!= EXT4_ERRORS_RO
)
1801 SEQ_OPTS_PUTS("errors=remount-ro");
1802 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
1803 SEQ_OPTS_PUTS("errors=continue");
1804 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
1805 SEQ_OPTS_PUTS("errors=panic");
1806 if (nodefs
|| sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
)
1807 SEQ_OPTS_PRINT("commit=%lu", sbi
->s_commit_interval
/ HZ
);
1808 if (nodefs
|| sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
)
1809 SEQ_OPTS_PRINT("min_batch_time=%u", sbi
->s_min_batch_time
);
1810 if (nodefs
|| sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
)
1811 SEQ_OPTS_PRINT("max_batch_time=%u", sbi
->s_max_batch_time
);
1812 if (sb
->s_flags
& MS_I_VERSION
)
1813 SEQ_OPTS_PUTS("i_version");
1814 if (nodefs
|| sbi
->s_stripe
)
1815 SEQ_OPTS_PRINT("stripe=%lu", sbi
->s_stripe
);
1816 if (EXT4_MOUNT_DATA_FLAGS
& (sbi
->s_mount_opt
^ def_mount_opt
)) {
1817 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
1818 SEQ_OPTS_PUTS("data=journal");
1819 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
1820 SEQ_OPTS_PUTS("data=ordered");
1821 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
1822 SEQ_OPTS_PUTS("data=writeback");
1825 sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
1826 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1827 sbi
->s_inode_readahead_blks
);
1829 if (nodefs
|| (test_opt(sb
, INIT_INODE_TABLE
) &&
1830 (sbi
->s_li_wait_mult
!= EXT4_DEF_LI_WAIT_MULT
)))
1831 SEQ_OPTS_PRINT("init_itable=%u", sbi
->s_li_wait_mult
);
1832 if (nodefs
|| sbi
->s_max_dir_size_kb
)
1833 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi
->s_max_dir_size_kb
);
1835 ext4_show_quota_options(seq
, sb
);
1839 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
)
1841 return _ext4_show_options(seq
, root
->d_sb
, 0);
1844 static int options_seq_show(struct seq_file
*seq
, void *offset
)
1846 struct super_block
*sb
= seq
->private;
1849 seq_puts(seq
, (sb
->s_flags
& MS_RDONLY
) ? "ro" : "rw");
1850 rc
= _ext4_show_options(seq
, sb
, 1);
1851 seq_puts(seq
, "\n");
1855 static int options_open_fs(struct inode
*inode
, struct file
*file
)
1857 return single_open(file
, options_seq_show
, PDE(inode
)->data
);
1860 static const struct file_operations ext4_seq_options_fops
= {
1861 .owner
= THIS_MODULE
,
1862 .open
= options_open_fs
,
1864 .llseek
= seq_lseek
,
1865 .release
= single_release
,
1868 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
1871 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1874 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
1875 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
1876 "forcing read-only mode");
1881 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
1882 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
1883 "running e2fsck is recommended");
1884 else if ((sbi
->s_mount_state
& EXT4_ERROR_FS
))
1885 ext4_msg(sb
, KERN_WARNING
,
1886 "warning: mounting fs with errors, "
1887 "running e2fsck is recommended");
1888 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) > 0 &&
1889 le16_to_cpu(es
->s_mnt_count
) >=
1890 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1891 ext4_msg(sb
, KERN_WARNING
,
1892 "warning: maximal mount count reached, "
1893 "running e2fsck is recommended");
1894 else if (le32_to_cpu(es
->s_checkinterval
) &&
1895 (le32_to_cpu(es
->s_lastcheck
) +
1896 le32_to_cpu(es
->s_checkinterval
) <= get_seconds()))
1897 ext4_msg(sb
, KERN_WARNING
,
1898 "warning: checktime reached, "
1899 "running e2fsck is recommended");
1900 if (!sbi
->s_journal
)
1901 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
1902 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
1903 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
1904 le16_add_cpu(&es
->s_mnt_count
, 1);
1905 es
->s_mtime
= cpu_to_le32(get_seconds());
1906 ext4_update_dynamic_rev(sb
);
1908 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
1910 ext4_commit_super(sb
, 1);
1912 if (test_opt(sb
, DEBUG
))
1913 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
1914 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1916 sbi
->s_groups_count
,
1917 EXT4_BLOCKS_PER_GROUP(sb
),
1918 EXT4_INODES_PER_GROUP(sb
),
1919 sbi
->s_mount_opt
, sbi
->s_mount_opt2
);
1921 cleancache_init_fs(sb
);
1925 int ext4_alloc_flex_bg_array(struct super_block
*sb
, ext4_group_t ngroup
)
1927 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1928 struct flex_groups
*new_groups
;
1931 if (!sbi
->s_log_groups_per_flex
)
1934 size
= ext4_flex_group(sbi
, ngroup
- 1) + 1;
1935 if (size
<= sbi
->s_flex_groups_allocated
)
1938 size
= roundup_pow_of_two(size
* sizeof(struct flex_groups
));
1939 new_groups
= ext4_kvzalloc(size
, GFP_KERNEL
);
1941 ext4_msg(sb
, KERN_ERR
, "not enough memory for %d flex groups",
1942 size
/ (int) sizeof(struct flex_groups
));
1946 if (sbi
->s_flex_groups
) {
1947 memcpy(new_groups
, sbi
->s_flex_groups
,
1948 (sbi
->s_flex_groups_allocated
*
1949 sizeof(struct flex_groups
)));
1950 ext4_kvfree(sbi
->s_flex_groups
);
1952 sbi
->s_flex_groups
= new_groups
;
1953 sbi
->s_flex_groups_allocated
= size
/ sizeof(struct flex_groups
);
1957 static int ext4_fill_flex_info(struct super_block
*sb
)
1959 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1960 struct ext4_group_desc
*gdp
= NULL
;
1961 ext4_group_t flex_group
;
1962 unsigned int groups_per_flex
= 0;
1965 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
1966 if (sbi
->s_log_groups_per_flex
< 1 || sbi
->s_log_groups_per_flex
> 31) {
1967 sbi
->s_log_groups_per_flex
= 0;
1970 groups_per_flex
= 1U << sbi
->s_log_groups_per_flex
;
1972 err
= ext4_alloc_flex_bg_array(sb
, sbi
->s_groups_count
);
1976 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
1977 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
1979 flex_group
= ext4_flex_group(sbi
, i
);
1980 atomic_add(ext4_free_inodes_count(sb
, gdp
),
1981 &sbi
->s_flex_groups
[flex_group
].free_inodes
);
1982 atomic_add(ext4_free_group_clusters(sb
, gdp
),
1983 &sbi
->s_flex_groups
[flex_group
].free_clusters
);
1984 atomic_add(ext4_used_dirs_count(sb
, gdp
),
1985 &sbi
->s_flex_groups
[flex_group
].used_dirs
);
1993 static __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 block_group
,
1994 struct ext4_group_desc
*gdp
)
1998 __le32 le_group
= cpu_to_le32(block_group
);
2000 if ((sbi
->s_es
->s_feature_ro_compat
&
2001 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))) {
2002 /* Use new metadata_csum algorithm */
2006 old_csum
= gdp
->bg_checksum
;
2007 gdp
->bg_checksum
= 0;
2008 csum32
= ext4_chksum(sbi
, sbi
->s_csum_seed
, (__u8
*)&le_group
,
2010 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)gdp
,
2012 gdp
->bg_checksum
= old_csum
;
2014 crc
= csum32
& 0xFFFF;
2018 /* old crc16 code */
2019 offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
2021 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
2022 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
2023 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
2024 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
2025 /* for checksum of struct ext4_group_desc do the rest...*/
2026 if ((sbi
->s_es
->s_feature_incompat
&
2027 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT
)) &&
2028 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
2029 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
2030 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
2034 return cpu_to_le16(crc
);
2037 int ext4_group_desc_csum_verify(struct super_block
*sb
, __u32 block_group
,
2038 struct ext4_group_desc
*gdp
)
2040 if (ext4_has_group_desc_csum(sb
) &&
2041 (gdp
->bg_checksum
!= ext4_group_desc_csum(EXT4_SB(sb
),
2048 void ext4_group_desc_csum_set(struct super_block
*sb
, __u32 block_group
,
2049 struct ext4_group_desc
*gdp
)
2051 if (!ext4_has_group_desc_csum(sb
))
2053 gdp
->bg_checksum
= ext4_group_desc_csum(EXT4_SB(sb
), block_group
, gdp
);
2056 /* Called at mount-time, super-block is locked */
2057 static int ext4_check_descriptors(struct super_block
*sb
,
2058 ext4_group_t
*first_not_zeroed
)
2060 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2061 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
2062 ext4_fsblk_t last_block
;
2063 ext4_fsblk_t block_bitmap
;
2064 ext4_fsblk_t inode_bitmap
;
2065 ext4_fsblk_t inode_table
;
2066 int flexbg_flag
= 0;
2067 ext4_group_t i
, grp
= sbi
->s_groups_count
;
2069 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
2072 ext4_debug("Checking group descriptors");
2074 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
2075 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2077 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
2078 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
2080 last_block
= first_block
+
2081 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2083 if ((grp
== sbi
->s_groups_count
) &&
2084 !(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2087 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
2088 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
2089 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2090 "Block bitmap for group %u not in group "
2091 "(block %llu)!", i
, block_bitmap
);
2094 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
2095 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
2096 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2097 "Inode bitmap for group %u not in group "
2098 "(block %llu)!", i
, inode_bitmap
);
2101 inode_table
= ext4_inode_table(sb
, gdp
);
2102 if (inode_table
< first_block
||
2103 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
2104 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2105 "Inode table for group %u not in group "
2106 "(block %llu)!", i
, inode_table
);
2109 ext4_lock_group(sb
, i
);
2110 if (!ext4_group_desc_csum_verify(sb
, i
, gdp
)) {
2111 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2112 "Checksum for group %u failed (%u!=%u)",
2113 i
, le16_to_cpu(ext4_group_desc_csum(sbi
, i
,
2114 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
2115 if (!(sb
->s_flags
& MS_RDONLY
)) {
2116 ext4_unlock_group(sb
, i
);
2120 ext4_unlock_group(sb
, i
);
2122 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
2124 if (NULL
!= first_not_zeroed
)
2125 *first_not_zeroed
= grp
;
2127 ext4_free_blocks_count_set(sbi
->s_es
,
2128 EXT4_C2B(sbi
, ext4_count_free_clusters(sb
)));
2129 sbi
->s_es
->s_free_inodes_count
=cpu_to_le32(ext4_count_free_inodes(sb
));
2133 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2134 * the superblock) which were deleted from all directories, but held open by
2135 * a process at the time of a crash. We walk the list and try to delete these
2136 * inodes at recovery time (only with a read-write filesystem).
2138 * In order to keep the orphan inode chain consistent during traversal (in
2139 * case of crash during recovery), we link each inode into the superblock
2140 * orphan list_head and handle it the same way as an inode deletion during
2141 * normal operation (which journals the operations for us).
2143 * We only do an iget() and an iput() on each inode, which is very safe if we
2144 * accidentally point at an in-use or already deleted inode. The worst that
2145 * can happen in this case is that we get a "bit already cleared" message from
2146 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2147 * e2fsck was run on this filesystem, and it must have already done the orphan
2148 * inode cleanup for us, so we can safely abort without any further action.
2150 static void ext4_orphan_cleanup(struct super_block
*sb
,
2151 struct ext4_super_block
*es
)
2153 unsigned int s_flags
= sb
->s_flags
;
2154 int nr_orphans
= 0, nr_truncates
= 0;
2158 if (!es
->s_last_orphan
) {
2159 jbd_debug(4, "no orphan inodes to clean up\n");
2163 if (bdev_read_only(sb
->s_bdev
)) {
2164 ext4_msg(sb
, KERN_ERR
, "write access "
2165 "unavailable, skipping orphan cleanup");
2169 /* Check if feature set would not allow a r/w mount */
2170 if (!ext4_feature_set_ok(sb
, 0)) {
2171 ext4_msg(sb
, KERN_INFO
, "Skipping orphan cleanup due to "
2172 "unknown ROCOMPAT features");
2176 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2177 /* don't clear list on RO mount w/ errors */
2178 if (es
->s_last_orphan
&& !(s_flags
& MS_RDONLY
)) {
2179 jbd_debug(1, "Errors on filesystem, "
2180 "clearing orphan list.\n");
2181 es
->s_last_orphan
= 0;
2183 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2187 if (s_flags
& MS_RDONLY
) {
2188 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
2189 sb
->s_flags
&= ~MS_RDONLY
;
2192 /* Needed for iput() to work correctly and not trash data */
2193 sb
->s_flags
|= MS_ACTIVE
;
2194 /* Turn on quotas so that they are updated correctly */
2195 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2196 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
2197 int ret
= ext4_quota_on_mount(sb
, i
);
2199 ext4_msg(sb
, KERN_ERR
,
2200 "Cannot turn on journaled "
2201 "quota: error %d", ret
);
2206 while (es
->s_last_orphan
) {
2207 struct inode
*inode
;
2209 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
2210 if (IS_ERR(inode
)) {
2211 es
->s_last_orphan
= 0;
2215 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
2216 dquot_initialize(inode
);
2217 if (inode
->i_nlink
) {
2218 ext4_msg(sb
, KERN_DEBUG
,
2219 "%s: truncating inode %lu to %lld bytes",
2220 __func__
, inode
->i_ino
, inode
->i_size
);
2221 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2222 inode
->i_ino
, inode
->i_size
);
2223 ext4_truncate(inode
);
2226 ext4_msg(sb
, KERN_DEBUG
,
2227 "%s: deleting unreferenced inode %lu",
2228 __func__
, inode
->i_ino
);
2229 jbd_debug(2, "deleting unreferenced inode %lu\n",
2233 iput(inode
); /* The delete magic happens here! */
2236 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2239 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
2240 PLURAL(nr_orphans
));
2242 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
2243 PLURAL(nr_truncates
));
2245 /* Turn quotas off */
2246 for (i
= 0; i
< MAXQUOTAS
; i
++) {
2247 if (sb_dqopt(sb
)->files
[i
])
2248 dquot_quota_off(sb
, i
);
2251 sb
->s_flags
= s_flags
; /* Restore MS_RDONLY status */
2255 * Maximal extent format file size.
2256 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2257 * extent format containers, within a sector_t, and within i_blocks
2258 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2259 * so that won't be a limiting factor.
2261 * However there is other limiting factor. We do store extents in the form
2262 * of starting block and length, hence the resulting length of the extent
2263 * covering maximum file size must fit into on-disk format containers as
2264 * well. Given that length is always by 1 unit bigger than max unit (because
2265 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2267 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2269 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
2272 loff_t upper_limit
= MAX_LFS_FILESIZE
;
2274 /* small i_blocks in vfs inode? */
2275 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2277 * CONFIG_LBDAF is not enabled implies the inode
2278 * i_block represent total blocks in 512 bytes
2279 * 32 == size of vfs inode i_blocks * 8
2281 upper_limit
= (1LL << 32) - 1;
2283 /* total blocks in file system block size */
2284 upper_limit
>>= (blkbits
- 9);
2285 upper_limit
<<= blkbits
;
2289 * 32-bit extent-start container, ee_block. We lower the maxbytes
2290 * by one fs block, so ee_len can cover the extent of maximum file
2293 res
= (1LL << 32) - 1;
2296 /* Sanity check against vm- & vfs- imposed limits */
2297 if (res
> upper_limit
)
2304 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2305 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2306 * We need to be 1 filesystem block less than the 2^48 sector limit.
2308 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2310 loff_t res
= EXT4_NDIR_BLOCKS
;
2313 /* This is calculated to be the largest file size for a dense, block
2314 * mapped file such that the file's total number of 512-byte sectors,
2315 * including data and all indirect blocks, does not exceed (2^48 - 1).
2317 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2318 * number of 512-byte sectors of the file.
2321 if (!has_huge_files
|| sizeof(blkcnt_t
) < sizeof(u64
)) {
2323 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2324 * the inode i_block field represents total file blocks in
2325 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2327 upper_limit
= (1LL << 32) - 1;
2329 /* total blocks in file system block size */
2330 upper_limit
>>= (bits
- 9);
2334 * We use 48 bit ext4_inode i_blocks
2335 * With EXT4_HUGE_FILE_FL set the i_blocks
2336 * represent total number of blocks in
2337 * file system block size
2339 upper_limit
= (1LL << 48) - 1;
2343 /* indirect blocks */
2345 /* double indirect blocks */
2346 meta_blocks
+= 1 + (1LL << (bits
-2));
2347 /* tripple indirect blocks */
2348 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2350 upper_limit
-= meta_blocks
;
2351 upper_limit
<<= bits
;
2353 res
+= 1LL << (bits
-2);
2354 res
+= 1LL << (2*(bits
-2));
2355 res
+= 1LL << (3*(bits
-2));
2357 if (res
> upper_limit
)
2360 if (res
> MAX_LFS_FILESIZE
)
2361 res
= MAX_LFS_FILESIZE
;
2366 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2367 ext4_fsblk_t logical_sb_block
, int nr
)
2369 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2370 ext4_group_t bg
, first_meta_bg
;
2373 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2375 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_META_BG
) ||
2377 return logical_sb_block
+ nr
+ 1;
2378 bg
= sbi
->s_desc_per_block
* nr
;
2379 if (ext4_bg_has_super(sb
, bg
))
2382 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2386 * ext4_get_stripe_size: Get the stripe size.
2387 * @sbi: In memory super block info
2389 * If we have specified it via mount option, then
2390 * use the mount option value. If the value specified at mount time is
2391 * greater than the blocks per group use the super block value.
2392 * If the super block value is greater than blocks per group return 0.
2393 * Allocator needs it be less than blocks per group.
2396 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
2398 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
2399 unsigned long stripe_width
=
2400 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
2403 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
2404 ret
= sbi
->s_stripe
;
2405 else if (stripe_width
<= sbi
->s_blocks_per_group
)
2407 else if (stride
<= sbi
->s_blocks_per_group
)
2413 * If the stripe width is 1, this makes no sense and
2414 * we set it to 0 to turn off stripe handling code.
2425 struct attribute attr
;
2426 ssize_t (*show
)(struct ext4_attr
*, struct ext4_sb_info
*, char *);
2427 ssize_t (*store
)(struct ext4_attr
*, struct ext4_sb_info
*,
2428 const char *, size_t);
2432 static int parse_strtoul(const char *buf
,
2433 unsigned long max
, unsigned long *value
)
2437 *value
= simple_strtoul(skip_spaces(buf
), &endp
, 0);
2438 endp
= skip_spaces(endp
);
2439 if (*endp
|| *value
> max
)
2445 static ssize_t
delayed_allocation_blocks_show(struct ext4_attr
*a
,
2446 struct ext4_sb_info
*sbi
,
2449 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2451 percpu_counter_sum(&sbi
->s_dirtyclusters_counter
)));
2454 static ssize_t
session_write_kbytes_show(struct ext4_attr
*a
,
2455 struct ext4_sb_info
*sbi
, char *buf
)
2457 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2459 if (!sb
->s_bdev
->bd_part
)
2460 return snprintf(buf
, PAGE_SIZE
, "0\n");
2461 return snprintf(buf
, PAGE_SIZE
, "%lu\n",
2462 (part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2463 sbi
->s_sectors_written_start
) >> 1);
2466 static ssize_t
lifetime_write_kbytes_show(struct ext4_attr
*a
,
2467 struct ext4_sb_info
*sbi
, char *buf
)
2469 struct super_block
*sb
= sbi
->s_buddy_cache
->i_sb
;
2471 if (!sb
->s_bdev
->bd_part
)
2472 return snprintf(buf
, PAGE_SIZE
, "0\n");
2473 return snprintf(buf
, PAGE_SIZE
, "%llu\n",
2474 (unsigned long long)(sbi
->s_kbytes_written
+
2475 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
2476 EXT4_SB(sb
)->s_sectors_written_start
) >> 1)));
2479 static ssize_t
inode_readahead_blks_store(struct ext4_attr
*a
,
2480 struct ext4_sb_info
*sbi
,
2481 const char *buf
, size_t count
)
2485 if (parse_strtoul(buf
, 0x40000000, &t
))
2488 if (t
&& !is_power_of_2(t
))
2491 sbi
->s_inode_readahead_blks
= t
;
2495 static ssize_t
sbi_ui_show(struct ext4_attr
*a
,
2496 struct ext4_sb_info
*sbi
, char *buf
)
2498 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2500 return snprintf(buf
, PAGE_SIZE
, "%u\n", *ui
);
2503 static ssize_t
sbi_ui_store(struct ext4_attr
*a
,
2504 struct ext4_sb_info
*sbi
,
2505 const char *buf
, size_t count
)
2507 unsigned int *ui
= (unsigned int *) (((char *) sbi
) + a
->offset
);
2510 if (parse_strtoul(buf
, 0xffffffff, &t
))
2516 static ssize_t
trigger_test_error(struct ext4_attr
*a
,
2517 struct ext4_sb_info
*sbi
,
2518 const char *buf
, size_t count
)
2522 if (!capable(CAP_SYS_ADMIN
))
2525 if (len
&& buf
[len
-1] == '\n')
2529 ext4_error(sbi
->s_sb
, "%.*s", len
, buf
);
2533 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2534 static struct ext4_attr ext4_attr_##_name = { \
2535 .attr = {.name = __stringify(_name), .mode = _mode }, \
2538 .offset = offsetof(struct ext4_sb_info, _elname), \
2540 #define EXT4_ATTR(name, mode, show, store) \
2541 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2543 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2544 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2545 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2546 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2547 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2548 #define ATTR_LIST(name) &ext4_attr_##name.attr
2550 EXT4_RO_ATTR(delayed_allocation_blocks
);
2551 EXT4_RO_ATTR(session_write_kbytes
);
2552 EXT4_RO_ATTR(lifetime_write_kbytes
);
2553 EXT4_ATTR_OFFSET(inode_readahead_blks
, 0644, sbi_ui_show
,
2554 inode_readahead_blks_store
, s_inode_readahead_blks
);
2555 EXT4_RW_ATTR_SBI_UI(inode_goal
, s_inode_goal
);
2556 EXT4_RW_ATTR_SBI_UI(mb_stats
, s_mb_stats
);
2557 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan
, s_mb_max_to_scan
);
2558 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan
, s_mb_min_to_scan
);
2559 EXT4_RW_ATTR_SBI_UI(mb_order2_req
, s_mb_order2_reqs
);
2560 EXT4_RW_ATTR_SBI_UI(mb_stream_req
, s_mb_stream_request
);
2561 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc
, s_mb_group_prealloc
);
2562 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump
, s_max_writeback_mb_bump
);
2563 EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb
, s_extent_max_zeroout_kb
);
2564 EXT4_ATTR(trigger_fs_error
, 0200, NULL
, trigger_test_error
);
2566 static struct attribute
*ext4_attrs
[] = {
2567 ATTR_LIST(delayed_allocation_blocks
),
2568 ATTR_LIST(session_write_kbytes
),
2569 ATTR_LIST(lifetime_write_kbytes
),
2570 ATTR_LIST(inode_readahead_blks
),
2571 ATTR_LIST(inode_goal
),
2572 ATTR_LIST(mb_stats
),
2573 ATTR_LIST(mb_max_to_scan
),
2574 ATTR_LIST(mb_min_to_scan
),
2575 ATTR_LIST(mb_order2_req
),
2576 ATTR_LIST(mb_stream_req
),
2577 ATTR_LIST(mb_group_prealloc
),
2578 ATTR_LIST(max_writeback_mb_bump
),
2579 ATTR_LIST(extent_max_zeroout_kb
),
2580 ATTR_LIST(trigger_fs_error
),
2584 /* Features this copy of ext4 supports */
2585 EXT4_INFO_ATTR(lazy_itable_init
);
2586 EXT4_INFO_ATTR(batched_discard
);
2587 EXT4_INFO_ATTR(meta_bg_resize
);
2589 static struct attribute
*ext4_feat_attrs
[] = {
2590 ATTR_LIST(lazy_itable_init
),
2591 ATTR_LIST(batched_discard
),
2592 ATTR_LIST(meta_bg_resize
),
2596 static ssize_t
ext4_attr_show(struct kobject
*kobj
,
2597 struct attribute
*attr
, char *buf
)
2599 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2601 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2603 return a
->show
? a
->show(a
, sbi
, buf
) : 0;
2606 static ssize_t
ext4_attr_store(struct kobject
*kobj
,
2607 struct attribute
*attr
,
2608 const char *buf
, size_t len
)
2610 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2612 struct ext4_attr
*a
= container_of(attr
, struct ext4_attr
, attr
);
2614 return a
->store
? a
->store(a
, sbi
, buf
, len
) : 0;
2617 static void ext4_sb_release(struct kobject
*kobj
)
2619 struct ext4_sb_info
*sbi
= container_of(kobj
, struct ext4_sb_info
,
2621 complete(&sbi
->s_kobj_unregister
);
2624 static const struct sysfs_ops ext4_attr_ops
= {
2625 .show
= ext4_attr_show
,
2626 .store
= ext4_attr_store
,
2629 static struct kobj_type ext4_ktype
= {
2630 .default_attrs
= ext4_attrs
,
2631 .sysfs_ops
= &ext4_attr_ops
,
2632 .release
= ext4_sb_release
,
2635 static void ext4_feat_release(struct kobject
*kobj
)
2637 complete(&ext4_feat
->f_kobj_unregister
);
2640 static struct kobj_type ext4_feat_ktype
= {
2641 .default_attrs
= ext4_feat_attrs
,
2642 .sysfs_ops
= &ext4_attr_ops
,
2643 .release
= ext4_feat_release
,
2647 * Check whether this filesystem can be mounted based on
2648 * the features present and the RDONLY/RDWR mount requested.
2649 * Returns 1 if this filesystem can be mounted as requested,
2650 * 0 if it cannot be.
2652 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
2654 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT4_FEATURE_INCOMPAT_SUPP
)) {
2655 ext4_msg(sb
, KERN_ERR
,
2656 "Couldn't mount because of "
2657 "unsupported optional features (%x)",
2658 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
2659 ~EXT4_FEATURE_INCOMPAT_SUPP
));
2666 /* Check that feature set is OK for a read-write mount */
2667 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT4_FEATURE_RO_COMPAT_SUPP
)) {
2668 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
2669 "unsupported optional features (%x)",
2670 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
2671 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
2675 * Large file size enabled file system can only be mounted
2676 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2678 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
2679 if (sizeof(blkcnt_t
) < sizeof(u64
)) {
2680 ext4_msg(sb
, KERN_ERR
, "Filesystem with huge files "
2681 "cannot be mounted RDWR without "
2686 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_BIGALLOC
) &&
2687 !EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_EXTENTS
)) {
2688 ext4_msg(sb
, KERN_ERR
,
2689 "Can't support bigalloc feature without "
2690 "extents feature\n");
2694 #ifndef CONFIG_QUOTA
2695 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
) &&
2697 ext4_msg(sb
, KERN_ERR
,
2698 "Filesystem with quota feature cannot be mounted RDWR "
2699 "without CONFIG_QUOTA");
2702 #endif /* CONFIG_QUOTA */
2707 * This function is called once a day if we have errors logged
2708 * on the file system
2710 static void print_daily_error_info(unsigned long arg
)
2712 struct super_block
*sb
= (struct super_block
*) arg
;
2713 struct ext4_sb_info
*sbi
;
2714 struct ext4_super_block
*es
;
2719 if (es
->s_error_count
)
2720 ext4_msg(sb
, KERN_NOTICE
, "error count: %u",
2721 le32_to_cpu(es
->s_error_count
));
2722 if (es
->s_first_error_time
) {
2723 printk(KERN_NOTICE
"EXT4-fs (%s): initial error at %u: %.*s:%d",
2724 sb
->s_id
, le32_to_cpu(es
->s_first_error_time
),
2725 (int) sizeof(es
->s_first_error_func
),
2726 es
->s_first_error_func
,
2727 le32_to_cpu(es
->s_first_error_line
));
2728 if (es
->s_first_error_ino
)
2729 printk(": inode %u",
2730 le32_to_cpu(es
->s_first_error_ino
));
2731 if (es
->s_first_error_block
)
2732 printk(": block %llu", (unsigned long long)
2733 le64_to_cpu(es
->s_first_error_block
));
2736 if (es
->s_last_error_time
) {
2737 printk(KERN_NOTICE
"EXT4-fs (%s): last error at %u: %.*s:%d",
2738 sb
->s_id
, le32_to_cpu(es
->s_last_error_time
),
2739 (int) sizeof(es
->s_last_error_func
),
2740 es
->s_last_error_func
,
2741 le32_to_cpu(es
->s_last_error_line
));
2742 if (es
->s_last_error_ino
)
2743 printk(": inode %u",
2744 le32_to_cpu(es
->s_last_error_ino
));
2745 if (es
->s_last_error_block
)
2746 printk(": block %llu", (unsigned long long)
2747 le64_to_cpu(es
->s_last_error_block
));
2750 mod_timer(&sbi
->s_err_report
, jiffies
+ 24*60*60*HZ
); /* Once a day */
2753 /* Find next suitable group and run ext4_init_inode_table */
2754 static int ext4_run_li_request(struct ext4_li_request
*elr
)
2756 struct ext4_group_desc
*gdp
= NULL
;
2757 ext4_group_t group
, ngroups
;
2758 struct super_block
*sb
;
2759 unsigned long timeout
= 0;
2763 ngroups
= EXT4_SB(sb
)->s_groups_count
;
2766 for (group
= elr
->lr_next_group
; group
< ngroups
; group
++) {
2767 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2773 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2777 if (group
== ngroups
)
2782 ret
= ext4_init_inode_table(sb
, group
,
2783 elr
->lr_timeout
? 0 : 1);
2784 if (elr
->lr_timeout
== 0) {
2785 timeout
= (jiffies
- timeout
) *
2786 elr
->lr_sbi
->s_li_wait_mult
;
2787 elr
->lr_timeout
= timeout
;
2789 elr
->lr_next_sched
= jiffies
+ elr
->lr_timeout
;
2790 elr
->lr_next_group
= group
+ 1;
2798 * Remove lr_request from the list_request and free the
2799 * request structure. Should be called with li_list_mtx held
2801 static void ext4_remove_li_request(struct ext4_li_request
*elr
)
2803 struct ext4_sb_info
*sbi
;
2810 list_del(&elr
->lr_request
);
2811 sbi
->s_li_request
= NULL
;
2815 static void ext4_unregister_li_request(struct super_block
*sb
)
2817 mutex_lock(&ext4_li_mtx
);
2818 if (!ext4_li_info
) {
2819 mutex_unlock(&ext4_li_mtx
);
2823 mutex_lock(&ext4_li_info
->li_list_mtx
);
2824 ext4_remove_li_request(EXT4_SB(sb
)->s_li_request
);
2825 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2826 mutex_unlock(&ext4_li_mtx
);
2829 static struct task_struct
*ext4_lazyinit_task
;
2832 * This is the function where ext4lazyinit thread lives. It walks
2833 * through the request list searching for next scheduled filesystem.
2834 * When such a fs is found, run the lazy initialization request
2835 * (ext4_rn_li_request) and keep track of the time spend in this
2836 * function. Based on that time we compute next schedule time of
2837 * the request. When walking through the list is complete, compute
2838 * next waking time and put itself into sleep.
2840 static int ext4_lazyinit_thread(void *arg
)
2842 struct ext4_lazy_init
*eli
= (struct ext4_lazy_init
*)arg
;
2843 struct list_head
*pos
, *n
;
2844 struct ext4_li_request
*elr
;
2845 unsigned long next_wakeup
, cur
;
2847 BUG_ON(NULL
== eli
);
2851 next_wakeup
= MAX_JIFFY_OFFSET
;
2853 mutex_lock(&eli
->li_list_mtx
);
2854 if (list_empty(&eli
->li_request_list
)) {
2855 mutex_unlock(&eli
->li_list_mtx
);
2859 list_for_each_safe(pos
, n
, &eli
->li_request_list
) {
2860 elr
= list_entry(pos
, struct ext4_li_request
,
2863 if (time_after_eq(jiffies
, elr
->lr_next_sched
)) {
2864 if (ext4_run_li_request(elr
) != 0) {
2865 /* error, remove the lazy_init job */
2866 ext4_remove_li_request(elr
);
2871 if (time_before(elr
->lr_next_sched
, next_wakeup
))
2872 next_wakeup
= elr
->lr_next_sched
;
2874 mutex_unlock(&eli
->li_list_mtx
);
2879 if ((time_after_eq(cur
, next_wakeup
)) ||
2880 (MAX_JIFFY_OFFSET
== next_wakeup
)) {
2885 schedule_timeout_interruptible(next_wakeup
- cur
);
2887 if (kthread_should_stop()) {
2888 ext4_clear_request_list();
2895 * It looks like the request list is empty, but we need
2896 * to check it under the li_list_mtx lock, to prevent any
2897 * additions into it, and of course we should lock ext4_li_mtx
2898 * to atomically free the list and ext4_li_info, because at
2899 * this point another ext4 filesystem could be registering
2902 mutex_lock(&ext4_li_mtx
);
2903 mutex_lock(&eli
->li_list_mtx
);
2904 if (!list_empty(&eli
->li_request_list
)) {
2905 mutex_unlock(&eli
->li_list_mtx
);
2906 mutex_unlock(&ext4_li_mtx
);
2909 mutex_unlock(&eli
->li_list_mtx
);
2910 kfree(ext4_li_info
);
2911 ext4_li_info
= NULL
;
2912 mutex_unlock(&ext4_li_mtx
);
2917 static void ext4_clear_request_list(void)
2919 struct list_head
*pos
, *n
;
2920 struct ext4_li_request
*elr
;
2922 mutex_lock(&ext4_li_info
->li_list_mtx
);
2923 list_for_each_safe(pos
, n
, &ext4_li_info
->li_request_list
) {
2924 elr
= list_entry(pos
, struct ext4_li_request
,
2926 ext4_remove_li_request(elr
);
2928 mutex_unlock(&ext4_li_info
->li_list_mtx
);
2931 static int ext4_run_lazyinit_thread(void)
2933 ext4_lazyinit_task
= kthread_run(ext4_lazyinit_thread
,
2934 ext4_li_info
, "ext4lazyinit");
2935 if (IS_ERR(ext4_lazyinit_task
)) {
2936 int err
= PTR_ERR(ext4_lazyinit_task
);
2937 ext4_clear_request_list();
2938 kfree(ext4_li_info
);
2939 ext4_li_info
= NULL
;
2940 printk(KERN_CRIT
"EXT4-fs: error %d creating inode table "
2941 "initialization thread\n",
2945 ext4_li_info
->li_state
|= EXT4_LAZYINIT_RUNNING
;
2950 * Check whether it make sense to run itable init. thread or not.
2951 * If there is at least one uninitialized inode table, return
2952 * corresponding group number, else the loop goes through all
2953 * groups and return total number of groups.
2955 static ext4_group_t
ext4_has_uninit_itable(struct super_block
*sb
)
2957 ext4_group_t group
, ngroups
= EXT4_SB(sb
)->s_groups_count
;
2958 struct ext4_group_desc
*gdp
= NULL
;
2960 for (group
= 0; group
< ngroups
; group
++) {
2961 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
2965 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2972 static int ext4_li_info_new(void)
2974 struct ext4_lazy_init
*eli
= NULL
;
2976 eli
= kzalloc(sizeof(*eli
), GFP_KERNEL
);
2980 INIT_LIST_HEAD(&eli
->li_request_list
);
2981 mutex_init(&eli
->li_list_mtx
);
2983 eli
->li_state
|= EXT4_LAZYINIT_QUIT
;
2990 static struct ext4_li_request
*ext4_li_request_new(struct super_block
*sb
,
2993 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2994 struct ext4_li_request
*elr
;
2997 elr
= kzalloc(sizeof(*elr
), GFP_KERNEL
);
3003 elr
->lr_next_group
= start
;
3006 * Randomize first schedule time of the request to
3007 * spread the inode table initialization requests
3010 get_random_bytes(&rnd
, sizeof(rnd
));
3011 elr
->lr_next_sched
= jiffies
+ (unsigned long)rnd
%
3012 (EXT4_DEF_LI_MAX_START_DELAY
* HZ
);
3017 static int ext4_register_li_request(struct super_block
*sb
,
3018 ext4_group_t first_not_zeroed
)
3020 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3021 struct ext4_li_request
*elr
;
3022 ext4_group_t ngroups
= EXT4_SB(sb
)->s_groups_count
;
3025 if (sbi
->s_li_request
!= NULL
) {
3027 * Reset timeout so it can be computed again, because
3028 * s_li_wait_mult might have changed.
3030 sbi
->s_li_request
->lr_timeout
= 0;
3034 if (first_not_zeroed
== ngroups
||
3035 (sb
->s_flags
& MS_RDONLY
) ||
3036 !test_opt(sb
, INIT_INODE_TABLE
))
3039 elr
= ext4_li_request_new(sb
, first_not_zeroed
);
3043 mutex_lock(&ext4_li_mtx
);
3045 if (NULL
== ext4_li_info
) {
3046 ret
= ext4_li_info_new();
3051 mutex_lock(&ext4_li_info
->li_list_mtx
);
3052 list_add(&elr
->lr_request
, &ext4_li_info
->li_request_list
);
3053 mutex_unlock(&ext4_li_info
->li_list_mtx
);
3055 sbi
->s_li_request
= elr
;
3057 * set elr to NULL here since it has been inserted to
3058 * the request_list and the removal and free of it is
3059 * handled by ext4_clear_request_list from now on.
3063 if (!(ext4_li_info
->li_state
& EXT4_LAZYINIT_RUNNING
)) {
3064 ret
= ext4_run_lazyinit_thread();
3069 mutex_unlock(&ext4_li_mtx
);
3076 * We do not need to lock anything since this is called on
3079 static void ext4_destroy_lazyinit_thread(void)
3082 * If thread exited earlier
3083 * there's nothing to be done.
3085 if (!ext4_li_info
|| !ext4_lazyinit_task
)
3088 kthread_stop(ext4_lazyinit_task
);
3091 static int set_journal_csum_feature_set(struct super_block
*sb
)
3094 int compat
, incompat
;
3095 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3097 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3098 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
)) {
3099 /* journal checksum v2 */
3101 incompat
= JBD2_FEATURE_INCOMPAT_CSUM_V2
;
3103 /* journal checksum v1 */
3104 compat
= JBD2_FEATURE_COMPAT_CHECKSUM
;
3108 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
3109 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3111 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
|
3113 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
3114 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3117 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3118 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3120 jbd2_journal_clear_features(sbi
->s_journal
,
3121 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
3122 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
|
3123 JBD2_FEATURE_INCOMPAT_CSUM_V2
);
3130 * Note: calculating the overhead so we can be compatible with
3131 * historical BSD practice is quite difficult in the face of
3132 * clusters/bigalloc. This is because multiple metadata blocks from
3133 * different block group can end up in the same allocation cluster.
3134 * Calculating the exact overhead in the face of clustered allocation
3135 * requires either O(all block bitmaps) in memory or O(number of block
3136 * groups**2) in time. We will still calculate the superblock for
3137 * older file systems --- and if we come across with a bigalloc file
3138 * system with zero in s_overhead_clusters the estimate will be close to
3139 * correct especially for very large cluster sizes --- but for newer
3140 * file systems, it's better to calculate this figure once at mkfs
3141 * time, and store it in the superblock. If the superblock value is
3142 * present (even for non-bigalloc file systems), we will use it.
3144 static int count_overhead(struct super_block
*sb
, ext4_group_t grp
,
3147 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3148 struct ext4_group_desc
*gdp
;
3149 ext4_fsblk_t first_block
, last_block
, b
;
3150 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3151 int s
, j
, count
= 0;
3153 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_BIGALLOC
))
3154 return (ext4_bg_has_super(sb
, grp
) + ext4_bg_num_gdb(sb
, grp
) +
3155 sbi
->s_itb_per_group
+ 2);
3157 first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
) +
3158 (grp
* EXT4_BLOCKS_PER_GROUP(sb
));
3159 last_block
= first_block
+ EXT4_BLOCKS_PER_GROUP(sb
) - 1;
3160 for (i
= 0; i
< ngroups
; i
++) {
3161 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
3162 b
= ext4_block_bitmap(sb
, gdp
);
3163 if (b
>= first_block
&& b
<= last_block
) {
3164 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3167 b
= ext4_inode_bitmap(sb
, gdp
);
3168 if (b
>= first_block
&& b
<= last_block
) {
3169 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3172 b
= ext4_inode_table(sb
, gdp
);
3173 if (b
>= first_block
&& b
+ sbi
->s_itb_per_group
<= last_block
)
3174 for (j
= 0; j
< sbi
->s_itb_per_group
; j
++, b
++) {
3175 int c
= EXT4_B2C(sbi
, b
- first_block
);
3176 ext4_set_bit(c
, buf
);
3182 if (ext4_bg_has_super(sb
, grp
)) {
3183 ext4_set_bit(s
++, buf
);
3186 for (j
= ext4_bg_num_gdb(sb
, grp
); j
> 0; j
--) {
3187 ext4_set_bit(EXT4_B2C(sbi
, s
++), buf
);
3193 return EXT4_CLUSTERS_PER_GROUP(sb
) -
3194 ext4_count_free(buf
, EXT4_CLUSTERS_PER_GROUP(sb
) / 8);
3198 * Compute the overhead and stash it in sbi->s_overhead
3200 int ext4_calculate_overhead(struct super_block
*sb
)
3202 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3203 struct ext4_super_block
*es
= sbi
->s_es
;
3204 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3205 ext4_fsblk_t overhead
= 0;
3206 char *buf
= (char *) get_zeroed_page(GFP_KERNEL
);
3212 * Compute the overhead (FS structures). This is constant
3213 * for a given filesystem unless the number of block groups
3214 * changes so we cache the previous value until it does.
3218 * All of the blocks before first_data_block are overhead
3220 overhead
= EXT4_B2C(sbi
, le32_to_cpu(es
->s_first_data_block
));
3223 * Add the overhead found in each block group
3225 for (i
= 0; i
< ngroups
; i
++) {
3228 blks
= count_overhead(sb
, i
, buf
);
3231 memset(buf
, 0, PAGE_SIZE
);
3234 sbi
->s_overhead
= overhead
;
3236 free_page((unsigned long) buf
);
3240 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
3242 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
3243 struct buffer_head
*bh
;
3244 struct ext4_super_block
*es
= NULL
;
3245 struct ext4_sb_info
*sbi
;
3247 ext4_fsblk_t sb_block
= get_sb_block(&data
);
3248 ext4_fsblk_t logical_sb_block
;
3249 unsigned long offset
= 0;
3250 unsigned long journal_devnum
= 0;
3251 unsigned long def_mount_opts
;
3256 int blocksize
, clustersize
;
3257 unsigned int db_count
;
3259 int needs_recovery
, has_huge_files
, has_bigalloc
;
3262 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3263 ext4_group_t first_not_zeroed
;
3265 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
3269 sbi
->s_blockgroup_lock
=
3270 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
3271 if (!sbi
->s_blockgroup_lock
) {
3275 sb
->s_fs_info
= sbi
;
3277 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
3278 sbi
->s_sb_block
= sb_block
;
3279 if (sb
->s_bdev
->bd_part
)
3280 sbi
->s_sectors_written_start
=
3281 part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]);
3283 /* Cleanup superblock name */
3284 for (cp
= sb
->s_id
; (cp
= strchr(cp
, '/'));)
3287 /* -EINVAL is default */
3289 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
3291 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
3296 * The ext4 superblock will not be buffer aligned for other than 1kB
3297 * block sizes. We need to calculate the offset from buffer start.
3299 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
3300 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3301 offset
= do_div(logical_sb_block
, blocksize
);
3303 logical_sb_block
= sb_block
;
3306 if (!(bh
= sb_bread(sb
, logical_sb_block
))) {
3307 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
3311 * Note: s_es must be initialized as soon as possible because
3312 * some ext4 macro-instructions depend on its value
3314 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
3316 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
3317 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
3319 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
3321 /* Warn if metadata_csum and gdt_csum are both set. */
3322 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3323 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
) &&
3324 EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_GDT_CSUM
))
3325 ext4_warning(sb
, KERN_INFO
"metadata_csum and uninit_bg are "
3326 "redundant flags; please run fsck.");
3328 /* Check for a known checksum algorithm */
3329 if (!ext4_verify_csum_type(sb
, es
)) {
3330 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3331 "unknown checksum algorithm.");
3336 /* Load the checksum driver */
3337 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3338 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
)) {
3339 sbi
->s_chksum_driver
= crypto_alloc_shash("crc32c", 0, 0);
3340 if (IS_ERR(sbi
->s_chksum_driver
)) {
3341 ext4_msg(sb
, KERN_ERR
, "Cannot load crc32c driver.");
3342 ret
= PTR_ERR(sbi
->s_chksum_driver
);
3343 sbi
->s_chksum_driver
= NULL
;
3348 /* Check superblock checksum */
3349 if (!ext4_superblock_csum_verify(sb
, es
)) {
3350 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3351 "invalid superblock checksum. Run e2fsck?");
3356 /* Precompute checksum seed for all metadata */
3357 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3358 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))
3359 sbi
->s_csum_seed
= ext4_chksum(sbi
, ~0, es
->s_uuid
,
3360 sizeof(es
->s_uuid
));
3362 /* Set defaults before we parse the mount options */
3363 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
3364 set_opt(sb
, INIT_INODE_TABLE
);
3365 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
3367 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
3369 if (def_mount_opts
& EXT4_DEFM_UID16
)
3370 set_opt(sb
, NO_UID32
);
3371 /* xattr user namespace & acls are now defaulted on */
3372 set_opt(sb
, XATTR_USER
);
3373 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3374 set_opt(sb
, POSIX_ACL
);
3376 set_opt(sb
, MBLK_IO_SUBMIT
);
3377 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
3378 set_opt(sb
, JOURNAL_DATA
);
3379 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
3380 set_opt(sb
, ORDERED_DATA
);
3381 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
3382 set_opt(sb
, WRITEBACK_DATA
);
3384 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
3385 set_opt(sb
, ERRORS_PANIC
);
3386 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
3387 set_opt(sb
, ERRORS_CONT
);
3389 set_opt(sb
, ERRORS_RO
);
3390 if (def_mount_opts
& EXT4_DEFM_BLOCK_VALIDITY
)
3391 set_opt(sb
, BLOCK_VALIDITY
);
3392 if (def_mount_opts
& EXT4_DEFM_DISCARD
)
3393 set_opt(sb
, DISCARD
);
3395 sbi
->s_resuid
= make_kuid(&init_user_ns
, le16_to_cpu(es
->s_def_resuid
));
3396 sbi
->s_resgid
= make_kgid(&init_user_ns
, le16_to_cpu(es
->s_def_resgid
));
3397 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
3398 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
3399 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
3401 if ((def_mount_opts
& EXT4_DEFM_NOBARRIER
) == 0)
3402 set_opt(sb
, BARRIER
);
3405 * enable delayed allocation by default
3406 * Use -o nodelalloc to turn it off
3408 if (!IS_EXT3_SB(sb
) && !IS_EXT2_SB(sb
) &&
3409 ((def_mount_opts
& EXT4_DEFM_NODELALLOC
) == 0))
3410 set_opt(sb
, DELALLOC
);
3413 * set default s_li_wait_mult for lazyinit, for the case there is
3414 * no mount option specified.
3416 sbi
->s_li_wait_mult
= EXT4_DEF_LI_WAIT_MULT
;
3418 if (!parse_options((char *) sbi
->s_es
->s_mount_opts
, sb
,
3419 &journal_devnum
, &journal_ioprio
, 0)) {
3420 ext4_msg(sb
, KERN_WARNING
,
3421 "failed to parse options in superblock: %s",
3422 sbi
->s_es
->s_mount_opts
);
3424 sbi
->s_def_mount_opt
= sbi
->s_mount_opt
;
3425 if (!parse_options((char *) data
, sb
, &journal_devnum
,
3426 &journal_ioprio
, 0))
3429 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
3430 printk_once(KERN_WARNING
"EXT4-fs: Warning: mounting "
3431 "with data=journal disables delayed "
3432 "allocation and O_DIRECT support!\n");
3433 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
3434 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3435 "both data=journal and delalloc");
3438 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
3439 ext4_msg(sb
, KERN_ERR
, "can't mount with "
3440 "both data=journal and delalloc");
3443 if (test_opt(sb
, DELALLOC
))
3444 clear_opt(sb
, DELALLOC
);
3447 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
3448 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
3450 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
3451 (EXT4_HAS_COMPAT_FEATURE(sb
, ~0U) ||
3452 EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~0U) ||
3453 EXT4_HAS_INCOMPAT_FEATURE(sb
, ~0U)))
3454 ext4_msg(sb
, KERN_WARNING
,
3455 "feature flags set on rev 0 fs, "
3456 "running e2fsck is recommended");
3458 if (IS_EXT2_SB(sb
)) {
3459 if (ext2_feature_set_ok(sb
))
3460 ext4_msg(sb
, KERN_INFO
, "mounting ext2 file system "
3461 "using the ext4 subsystem");
3463 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext2 due "
3464 "to feature incompatibilities");
3469 if (IS_EXT3_SB(sb
)) {
3470 if (ext3_feature_set_ok(sb
))
3471 ext4_msg(sb
, KERN_INFO
, "mounting ext3 file system "
3472 "using the ext4 subsystem");
3474 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext3 due "
3475 "to feature incompatibilities");
3481 * Check feature flags regardless of the revision level, since we
3482 * previously didn't change the revision level when setting the flags,
3483 * so there is a chance incompat flags are set on a rev 0 filesystem.
3485 if (!ext4_feature_set_ok(sb
, (sb
->s_flags
& MS_RDONLY
)))
3488 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
3489 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
3490 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
3491 ext4_msg(sb
, KERN_ERR
,
3492 "Unsupported filesystem blocksize %d", blocksize
);
3496 if (sb
->s_blocksize
!= blocksize
) {
3497 /* Validate the filesystem blocksize */
3498 if (!sb_set_blocksize(sb
, blocksize
)) {
3499 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
3505 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3506 offset
= do_div(logical_sb_block
, blocksize
);
3507 bh
= sb_bread(sb
, logical_sb_block
);
3509 ext4_msg(sb
, KERN_ERR
,
3510 "Can't read superblock on 2nd try");
3513 es
= (struct ext4_super_block
*)(bh
->b_data
+ offset
);
3515 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
3516 ext4_msg(sb
, KERN_ERR
,
3517 "Magic mismatch, very weird!");
3522 has_huge_files
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3523 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
);
3524 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
3526 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
3528 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
3529 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
3530 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
3532 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
3533 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
3534 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
3535 (!is_power_of_2(sbi
->s_inode_size
)) ||
3536 (sbi
->s_inode_size
> blocksize
)) {
3537 ext4_msg(sb
, KERN_ERR
,
3538 "unsupported inode size: %d",
3542 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
)
3543 sb
->s_time_gran
= 1 << (EXT4_EPOCH_BITS
- 2);
3546 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
3547 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
)) {
3548 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
3549 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
3550 !is_power_of_2(sbi
->s_desc_size
)) {
3551 ext4_msg(sb
, KERN_ERR
,
3552 "unsupported descriptor size %lu",
3557 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
3559 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
3560 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
3561 if (EXT4_INODE_SIZE(sb
) == 0 || EXT4_INODES_PER_GROUP(sb
) == 0)
3564 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
3565 if (sbi
->s_inodes_per_block
== 0)
3567 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
3568 sbi
->s_inodes_per_block
;
3569 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
3571 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
3572 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
3573 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
3575 for (i
= 0; i
< 4; i
++)
3576 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
3577 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
3578 i
= le32_to_cpu(es
->s_flags
);
3579 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
3580 sbi
->s_hash_unsigned
= 3;
3581 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
3582 #ifdef __CHAR_UNSIGNED__
3583 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
3584 sbi
->s_hash_unsigned
= 3;
3586 es
->s_flags
|= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
3590 /* Handle clustersize */
3591 clustersize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_cluster_size
);
3592 has_bigalloc
= EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3593 EXT4_FEATURE_RO_COMPAT_BIGALLOC
);
3595 if (clustersize
< blocksize
) {
3596 ext4_msg(sb
, KERN_ERR
,
3597 "cluster size (%d) smaller than "
3598 "block size (%d)", clustersize
, blocksize
);
3601 sbi
->s_cluster_bits
= le32_to_cpu(es
->s_log_cluster_size
) -
3602 le32_to_cpu(es
->s_log_block_size
);
3603 sbi
->s_clusters_per_group
=
3604 le32_to_cpu(es
->s_clusters_per_group
);
3605 if (sbi
->s_clusters_per_group
> blocksize
* 8) {
3606 ext4_msg(sb
, KERN_ERR
,
3607 "#clusters per group too big: %lu",
3608 sbi
->s_clusters_per_group
);
3611 if (sbi
->s_blocks_per_group
!=
3612 (sbi
->s_clusters_per_group
* (clustersize
/ blocksize
))) {
3613 ext4_msg(sb
, KERN_ERR
, "blocks per group (%lu) and "
3614 "clusters per group (%lu) inconsistent",
3615 sbi
->s_blocks_per_group
,
3616 sbi
->s_clusters_per_group
);
3620 if (clustersize
!= blocksize
) {
3621 ext4_warning(sb
, "fragment/cluster size (%d) != "
3622 "block size (%d)", clustersize
,
3624 clustersize
= blocksize
;
3626 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
3627 ext4_msg(sb
, KERN_ERR
,
3628 "#blocks per group too big: %lu",
3629 sbi
->s_blocks_per_group
);
3632 sbi
->s_clusters_per_group
= sbi
->s_blocks_per_group
;
3633 sbi
->s_cluster_bits
= 0;
3635 sbi
->s_cluster_ratio
= clustersize
/ blocksize
;
3637 if (sbi
->s_inodes_per_group
> blocksize
* 8) {
3638 ext4_msg(sb
, KERN_ERR
,
3639 "#inodes per group too big: %lu",
3640 sbi
->s_inodes_per_group
);
3645 * Test whether we have more sectors than will fit in sector_t,
3646 * and whether the max offset is addressable by the page cache.
3648 err
= generic_check_addressable(sb
->s_blocksize_bits
,
3649 ext4_blocks_count(es
));
3651 ext4_msg(sb
, KERN_ERR
, "filesystem"
3652 " too large to mount safely on this system");
3653 if (sizeof(sector_t
) < 8)
3654 ext4_msg(sb
, KERN_WARNING
, "CONFIG_LBDAF not enabled");
3658 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
3661 /* check blocks count against device size */
3662 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
3663 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
3664 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
3665 "exceeds size of device (%llu blocks)",
3666 ext4_blocks_count(es
), blocks_count
);
3671 * It makes no sense for the first data block to be beyond the end
3672 * of the filesystem.
3674 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
3675 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data "
3676 "block %u is beyond end of filesystem (%llu)",
3677 le32_to_cpu(es
->s_first_data_block
),
3678 ext4_blocks_count(es
));
3681 blocks_count
= (ext4_blocks_count(es
) -
3682 le32_to_cpu(es
->s_first_data_block
) +
3683 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
3684 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
3685 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
3686 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %u "
3687 "(block count %llu, first data block %u, "
3688 "blocks per group %lu)", sbi
->s_groups_count
,
3689 ext4_blocks_count(es
),
3690 le32_to_cpu(es
->s_first_data_block
),
3691 EXT4_BLOCKS_PER_GROUP(sb
));
3694 sbi
->s_groups_count
= blocks_count
;
3695 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
3696 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
3697 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
3698 EXT4_DESC_PER_BLOCK(sb
);
3699 sbi
->s_group_desc
= ext4_kvmalloc(db_count
*
3700 sizeof(struct buffer_head
*),
3702 if (sbi
->s_group_desc
== NULL
) {
3703 ext4_msg(sb
, KERN_ERR
, "not enough memory");
3709 sbi
->s_proc
= proc_mkdir(sb
->s_id
, ext4_proc_root
);
3712 proc_create_data("options", S_IRUGO
, sbi
->s_proc
,
3713 &ext4_seq_options_fops
, sb
);
3715 bgl_lock_init(sbi
->s_blockgroup_lock
);
3717 for (i
= 0; i
< db_count
; i
++) {
3718 block
= descriptor_loc(sb
, logical_sb_block
, i
);
3719 sbi
->s_group_desc
[i
] = sb_bread(sb
, block
);
3720 if (!sbi
->s_group_desc
[i
]) {
3721 ext4_msg(sb
, KERN_ERR
,
3722 "can't read group descriptor %d", i
);
3727 if (!ext4_check_descriptors(sb
, &first_not_zeroed
)) {
3728 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
3731 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FLEX_BG
))
3732 if (!ext4_fill_flex_info(sb
)) {
3733 ext4_msg(sb
, KERN_ERR
,
3734 "unable to initialize "
3735 "flex_bg meta info!");
3739 sbi
->s_gdb_count
= db_count
;
3740 get_random_bytes(&sbi
->s_next_generation
, sizeof(u32
));
3741 spin_lock_init(&sbi
->s_next_gen_lock
);
3743 init_timer(&sbi
->s_err_report
);
3744 sbi
->s_err_report
.function
= print_daily_error_info
;
3745 sbi
->s_err_report
.data
= (unsigned long) sb
;
3747 err
= percpu_counter_init(&sbi
->s_freeclusters_counter
,
3748 ext4_count_free_clusters(sb
));
3750 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
,
3751 ext4_count_free_inodes(sb
));
3754 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
3755 ext4_count_dirs(sb
));
3758 err
= percpu_counter_init(&sbi
->s_dirtyclusters_counter
, 0);
3761 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
3765 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
3766 sbi
->s_max_writeback_mb_bump
= 128;
3767 sbi
->s_extent_max_zeroout_kb
= 32;
3770 * set up enough so that it can read an inode
3772 if (!test_opt(sb
, NOLOAD
) &&
3773 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
3774 sb
->s_op
= &ext4_sops
;
3776 sb
->s_op
= &ext4_nojournal_sops
;
3777 sb
->s_export_op
= &ext4_export_ops
;
3778 sb
->s_xattr
= ext4_xattr_handlers
;
3780 sb
->s_qcop
= &ext4_qctl_operations
;
3781 sb
->dq_op
= &ext4_quota_operations
;
3783 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
)) {
3784 /* Use qctl operations for hidden quota files. */
3785 sb
->s_qcop
= &ext4_qctl_sysfile_operations
;
3788 memcpy(sb
->s_uuid
, es
->s_uuid
, sizeof(es
->s_uuid
));
3790 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
3791 mutex_init(&sbi
->s_orphan_lock
);
3795 needs_recovery
= (es
->s_last_orphan
!= 0 ||
3796 EXT4_HAS_INCOMPAT_FEATURE(sb
,
3797 EXT4_FEATURE_INCOMPAT_RECOVER
));
3799 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_MMP
) &&
3800 !(sb
->s_flags
& MS_RDONLY
))
3801 if (ext4_multi_mount_protect(sb
, le64_to_cpu(es
->s_mmp_block
)))
3805 * The first inode we look at is the journal inode. Don't try
3806 * root first: it may be modified in the journal!
3808 if (!test_opt(sb
, NOLOAD
) &&
3809 EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
3810 if (ext4_load_journal(sb
, es
, journal_devnum
))
3812 } else if (test_opt(sb
, NOLOAD
) && !(sb
->s_flags
& MS_RDONLY
) &&
3813 EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
3814 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
3815 "suppressed and not mounted read-only");
3816 goto failed_mount_wq
;
3818 clear_opt(sb
, DATA_FLAGS
);
3819 sbi
->s_journal
= NULL
;
3824 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
) &&
3825 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
3826 JBD2_FEATURE_INCOMPAT_64BIT
)) {
3827 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
3828 goto failed_mount_wq
;
3831 if (!set_journal_csum_feature_set(sb
)) {
3832 ext4_msg(sb
, KERN_ERR
, "Failed to set journal checksum "
3834 goto failed_mount_wq
;
3837 /* We have now updated the journal if required, so we can
3838 * validate the data journaling mode. */
3839 switch (test_opt(sb
, DATA_FLAGS
)) {
3841 /* No mode set, assume a default based on the journal
3842 * capabilities: ORDERED_DATA if the journal can
3843 * cope, else JOURNAL_DATA
3845 if (jbd2_journal_check_available_features
3846 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
))
3847 set_opt(sb
, ORDERED_DATA
);
3849 set_opt(sb
, JOURNAL_DATA
);
3852 case EXT4_MOUNT_ORDERED_DATA
:
3853 case EXT4_MOUNT_WRITEBACK_DATA
:
3854 if (!jbd2_journal_check_available_features
3855 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
3856 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
3857 "requested data journaling mode");
3858 goto failed_mount_wq
;
3863 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
3865 sbi
->s_journal
->j_commit_callback
= ext4_journal_commit_callback
;
3868 * The journal may have updated the bg summary counts, so we
3869 * need to update the global counters.
3871 percpu_counter_set(&sbi
->s_freeclusters_counter
,
3872 ext4_count_free_clusters(sb
));
3873 percpu_counter_set(&sbi
->s_freeinodes_counter
,
3874 ext4_count_free_inodes(sb
));
3875 percpu_counter_set(&sbi
->s_dirs_counter
,
3876 ext4_count_dirs(sb
));
3877 percpu_counter_set(&sbi
->s_dirtyclusters_counter
, 0);
3881 * Get the # of file system overhead blocks from the
3882 * superblock if present.
3884 if (es
->s_overhead_clusters
)
3885 sbi
->s_overhead
= le32_to_cpu(es
->s_overhead_clusters
);
3887 err
= ext4_calculate_overhead(sb
);
3889 goto failed_mount_wq
;
3893 * The maximum number of concurrent works can be high and
3894 * concurrency isn't really necessary. Limit it to 1.
3896 EXT4_SB(sb
)->dio_unwritten_wq
=
3897 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM
| WQ_UNBOUND
, 1);
3898 if (!EXT4_SB(sb
)->dio_unwritten_wq
) {
3899 printk(KERN_ERR
"EXT4-fs: failed to create DIO workqueue\n");
3901 goto failed_mount_wq
;
3905 * The jbd2_journal_load will have done any necessary log recovery,
3906 * so we can safely mount the rest of the filesystem now.
3909 root
= ext4_iget(sb
, EXT4_ROOT_INO
);
3911 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
3912 ret
= PTR_ERR(root
);
3916 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
3917 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
3921 sb
->s_root
= d_make_root(root
);
3923 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
3928 if (ext4_setup_super(sb
, es
, sb
->s_flags
& MS_RDONLY
))
3929 sb
->s_flags
|= MS_RDONLY
;
3931 /* determine the minimum size of new large inodes, if present */
3932 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
3933 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
3934 EXT4_GOOD_OLD_INODE_SIZE
;
3935 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3936 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE
)) {
3937 if (sbi
->s_want_extra_isize
<
3938 le16_to_cpu(es
->s_want_extra_isize
))
3939 sbi
->s_want_extra_isize
=
3940 le16_to_cpu(es
->s_want_extra_isize
);
3941 if (sbi
->s_want_extra_isize
<
3942 le16_to_cpu(es
->s_min_extra_isize
))
3943 sbi
->s_want_extra_isize
=
3944 le16_to_cpu(es
->s_min_extra_isize
);
3947 /* Check if enough inode space is available */
3948 if (EXT4_GOOD_OLD_INODE_SIZE
+ sbi
->s_want_extra_isize
>
3949 sbi
->s_inode_size
) {
3950 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
3951 EXT4_GOOD_OLD_INODE_SIZE
;
3952 ext4_msg(sb
, KERN_INFO
, "required extra inode space not"
3956 err
= ext4_setup_system_zone(sb
);
3958 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
3960 goto failed_mount4a
;
3964 err
= ext4_mb_init(sb
);
3966 ext4_msg(sb
, KERN_ERR
, "failed to initialize mballoc (%d)",
3971 err
= ext4_register_li_request(sb
, first_not_zeroed
);
3975 sbi
->s_kobj
.kset
= ext4_kset
;
3976 init_completion(&sbi
->s_kobj_unregister
);
3977 err
= kobject_init_and_add(&sbi
->s_kobj
, &ext4_ktype
, NULL
,
3982 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
3983 ext4_orphan_cleanup(sb
, es
);
3984 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
3985 if (needs_recovery
) {
3986 ext4_msg(sb
, KERN_INFO
, "recovery complete");
3987 ext4_mark_recovery_complete(sb
, es
);
3989 if (EXT4_SB(sb
)->s_journal
) {
3990 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
3991 descr
= " journalled data mode";
3992 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
3993 descr
= " ordered data mode";
3995 descr
= " writeback data mode";
3997 descr
= "out journal";
4000 /* Enable quota usage during mount. */
4001 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
) &&
4002 !(sb
->s_flags
& MS_RDONLY
)) {
4003 err
= ext4_enable_quotas(sb
);
4007 #endif /* CONFIG_QUOTA */
4009 if (test_opt(sb
, DISCARD
)) {
4010 struct request_queue
*q
= bdev_get_queue(sb
->s_bdev
);
4011 if (!blk_queue_discard(q
))
4012 ext4_msg(sb
, KERN_WARNING
,
4013 "mounting with \"discard\" option, but "
4014 "the device does not support discard");
4017 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s. "
4018 "Opts: %s%s%s", descr
, sbi
->s_es
->s_mount_opts
,
4019 *sbi
->s_es
->s_mount_opts
? "; " : "", orig_data
);
4021 if (es
->s_error_count
)
4022 mod_timer(&sbi
->s_err_report
, jiffies
+ 300*HZ
); /* 5 minutes */
4029 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
4033 ext4_unregister_li_request(sb
);
4035 ext4_mb_release(sb
);
4037 ext4_ext_release(sb
);
4038 ext4_release_system_zone(sb
);
4043 ext4_msg(sb
, KERN_ERR
, "mount failed");
4044 destroy_workqueue(EXT4_SB(sb
)->dio_unwritten_wq
);
4046 if (sbi
->s_journal
) {
4047 jbd2_journal_destroy(sbi
->s_journal
);
4048 sbi
->s_journal
= NULL
;
4051 del_timer(&sbi
->s_err_report
);
4052 if (sbi
->s_flex_groups
)
4053 ext4_kvfree(sbi
->s_flex_groups
);
4054 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
4055 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
4056 percpu_counter_destroy(&sbi
->s_dirs_counter
);
4057 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
4059 kthread_stop(sbi
->s_mmp_tsk
);
4061 for (i
= 0; i
< db_count
; i
++)
4062 brelse(sbi
->s_group_desc
[i
]);
4063 ext4_kvfree(sbi
->s_group_desc
);
4065 if (sbi
->s_chksum_driver
)
4066 crypto_free_shash(sbi
->s_chksum_driver
);
4068 remove_proc_entry("options", sbi
->s_proc
);
4069 remove_proc_entry(sb
->s_id
, ext4_proc_root
);
4072 for (i
= 0; i
< MAXQUOTAS
; i
++)
4073 kfree(sbi
->s_qf_names
[i
]);
4075 ext4_blkdev_remove(sbi
);
4078 sb
->s_fs_info
= NULL
;
4079 kfree(sbi
->s_blockgroup_lock
);
4083 return err
? err
: ret
;
4087 * Setup any per-fs journal parameters now. We'll do this both on
4088 * initial mount, once the journal has been initialised but before we've
4089 * done any recovery; and again on any subsequent remount.
4091 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
4093 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4095 journal
->j_commit_interval
= sbi
->s_commit_interval
;
4096 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
4097 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
4099 write_lock(&journal
->j_state_lock
);
4100 if (test_opt(sb
, BARRIER
))
4101 journal
->j_flags
|= JBD2_BARRIER
;
4103 journal
->j_flags
&= ~JBD2_BARRIER
;
4104 if (test_opt(sb
, DATA_ERR_ABORT
))
4105 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
4107 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
4108 write_unlock(&journal
->j_state_lock
);
4111 static journal_t
*ext4_get_journal(struct super_block
*sb
,
4112 unsigned int journal_inum
)
4114 struct inode
*journal_inode
;
4117 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4119 /* First, test for the existence of a valid inode on disk. Bad
4120 * things happen if we iget() an unused inode, as the subsequent
4121 * iput() will try to delete it. */
4123 journal_inode
= ext4_iget(sb
, journal_inum
);
4124 if (IS_ERR(journal_inode
)) {
4125 ext4_msg(sb
, KERN_ERR
, "no journal found");
4128 if (!journal_inode
->i_nlink
) {
4129 make_bad_inode(journal_inode
);
4130 iput(journal_inode
);
4131 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
4135 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4136 journal_inode
, journal_inode
->i_size
);
4137 if (!S_ISREG(journal_inode
->i_mode
)) {
4138 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
4139 iput(journal_inode
);
4143 journal
= jbd2_journal_init_inode(journal_inode
);
4145 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
4146 iput(journal_inode
);
4149 journal
->j_private
= sb
;
4150 ext4_init_journal_params(sb
, journal
);
4154 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
4157 struct buffer_head
*bh
;
4161 int hblock
, blocksize
;
4162 ext4_fsblk_t sb_block
;
4163 unsigned long offset
;
4164 struct ext4_super_block
*es
;
4165 struct block_device
*bdev
;
4167 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4169 bdev
= ext4_blkdev_get(j_dev
, sb
);
4173 blocksize
= sb
->s_blocksize
;
4174 hblock
= bdev_logical_block_size(bdev
);
4175 if (blocksize
< hblock
) {
4176 ext4_msg(sb
, KERN_ERR
,
4177 "blocksize too small for journal device");
4181 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
4182 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
4183 set_blocksize(bdev
, blocksize
);
4184 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
4185 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
4186 "external journal");
4190 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
4191 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
4192 !(le32_to_cpu(es
->s_feature_incompat
) &
4193 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
4194 ext4_msg(sb
, KERN_ERR
, "external journal has "
4200 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
4201 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
4206 len
= ext4_blocks_count(es
);
4207 start
= sb_block
+ 1;
4208 brelse(bh
); /* we're done with the superblock */
4210 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
4211 start
, len
, blocksize
);
4213 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
4216 journal
->j_private
= sb
;
4217 ll_rw_block(READ
, 1, &journal
->j_sb_buffer
);
4218 wait_on_buffer(journal
->j_sb_buffer
);
4219 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
4220 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
4223 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
4224 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
4225 "user (unsupported) - %d",
4226 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
4229 EXT4_SB(sb
)->journal_bdev
= bdev
;
4230 ext4_init_journal_params(sb
, journal
);
4234 jbd2_journal_destroy(journal
);
4236 ext4_blkdev_put(bdev
);
4240 static int ext4_load_journal(struct super_block
*sb
,
4241 struct ext4_super_block
*es
,
4242 unsigned long journal_devnum
)
4245 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
4248 int really_read_only
;
4250 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4252 if (journal_devnum
&&
4253 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4254 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
4255 "numbers have changed");
4256 journal_dev
= new_decode_dev(journal_devnum
);
4258 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
4260 really_read_only
= bdev_read_only(sb
->s_bdev
);
4263 * Are we loading a blank journal or performing recovery after a
4264 * crash? For recovery, we need to check in advance whether we
4265 * can get read-write access to the device.
4267 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
)) {
4268 if (sb
->s_flags
& MS_RDONLY
) {
4269 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
4270 "required on readonly filesystem");
4271 if (really_read_only
) {
4272 ext4_msg(sb
, KERN_ERR
, "write access "
4273 "unavailable, cannot proceed");
4276 ext4_msg(sb
, KERN_INFO
, "write access will "
4277 "be enabled during recovery");
4281 if (journal_inum
&& journal_dev
) {
4282 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
4283 "and inode journals!");
4288 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
4291 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
4295 if (!(journal
->j_flags
& JBD2_BARRIER
))
4296 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
4298 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
))
4299 err
= jbd2_journal_wipe(journal
, !really_read_only
);
4301 char *save
= kmalloc(EXT4_S_ERR_LEN
, GFP_KERNEL
);
4303 memcpy(save
, ((char *) es
) +
4304 EXT4_S_ERR_START
, EXT4_S_ERR_LEN
);
4305 err
= jbd2_journal_load(journal
);
4307 memcpy(((char *) es
) + EXT4_S_ERR_START
,
4308 save
, EXT4_S_ERR_LEN
);
4313 ext4_msg(sb
, KERN_ERR
, "error loading journal");
4314 jbd2_journal_destroy(journal
);
4318 EXT4_SB(sb
)->s_journal
= journal
;
4319 ext4_clear_journal_err(sb
, es
);
4321 if (!really_read_only
&& journal_devnum
&&
4322 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
4323 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
4325 /* Make sure we flush the recovery flag to disk. */
4326 ext4_commit_super(sb
, 1);
4332 static int ext4_commit_super(struct super_block
*sb
, int sync
)
4334 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
4335 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
4338 if (!sbh
|| block_device_ejected(sb
))
4340 if (buffer_write_io_error(sbh
)) {
4342 * Oh, dear. A previous attempt to write the
4343 * superblock failed. This could happen because the
4344 * USB device was yanked out. Or it could happen to
4345 * be a transient write error and maybe the block will
4346 * be remapped. Nothing we can do but to retry the
4347 * write and hope for the best.
4349 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
4350 "superblock detected");
4351 clear_buffer_write_io_error(sbh
);
4352 set_buffer_uptodate(sbh
);
4355 * If the file system is mounted read-only, don't update the
4356 * superblock write time. This avoids updating the superblock
4357 * write time when we are mounting the root file system
4358 * read/only but we need to replay the journal; at that point,
4359 * for people who are east of GMT and who make their clock
4360 * tick in localtime for Windows bug-for-bug compatibility,
4361 * the clock is set in the future, and this will cause e2fsck
4362 * to complain and force a full file system check.
4364 if (!(sb
->s_flags
& MS_RDONLY
))
4365 es
->s_wtime
= cpu_to_le32(get_seconds());
4366 if (sb
->s_bdev
->bd_part
)
4367 es
->s_kbytes_written
=
4368 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
4369 ((part_stat_read(sb
->s_bdev
->bd_part
, sectors
[1]) -
4370 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
4372 es
->s_kbytes_written
=
4373 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
);
4374 ext4_free_blocks_count_set(es
,
4375 EXT4_C2B(EXT4_SB(sb
), percpu_counter_sum_positive(
4376 &EXT4_SB(sb
)->s_freeclusters_counter
)));
4377 es
->s_free_inodes_count
=
4378 cpu_to_le32(percpu_counter_sum_positive(
4379 &EXT4_SB(sb
)->s_freeinodes_counter
));
4380 BUFFER_TRACE(sbh
, "marking dirty");
4381 ext4_superblock_csum_set(sb
);
4382 mark_buffer_dirty(sbh
);
4384 error
= sync_dirty_buffer(sbh
);
4388 error
= buffer_write_io_error(sbh
);
4390 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
4392 clear_buffer_write_io_error(sbh
);
4393 set_buffer_uptodate(sbh
);
4400 * Have we just finished recovery? If so, and if we are mounting (or
4401 * remounting) the filesystem readonly, then we will end up with a
4402 * consistent fs on disk. Record that fact.
4404 static void ext4_mark_recovery_complete(struct super_block
*sb
,
4405 struct ext4_super_block
*es
)
4407 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
4409 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
)) {
4410 BUG_ON(journal
!= NULL
);
4413 jbd2_journal_lock_updates(journal
);
4414 if (jbd2_journal_flush(journal
) < 0)
4417 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
) &&
4418 sb
->s_flags
& MS_RDONLY
) {
4419 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4420 ext4_commit_super(sb
, 1);
4424 jbd2_journal_unlock_updates(journal
);
4428 * If we are mounting (or read-write remounting) a filesystem whose journal
4429 * has recorded an error from a previous lifetime, move that error to the
4430 * main filesystem now.
4432 static void ext4_clear_journal_err(struct super_block
*sb
,
4433 struct ext4_super_block
*es
)
4439 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
));
4441 journal
= EXT4_SB(sb
)->s_journal
;
4444 * Now check for any error status which may have been recorded in the
4445 * journal by a prior ext4_error() or ext4_abort()
4448 j_errno
= jbd2_journal_errno(journal
);
4452 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
4453 ext4_warning(sb
, "Filesystem error recorded "
4454 "from previous mount: %s", errstr
);
4455 ext4_warning(sb
, "Marking fs in need of filesystem check.");
4457 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
4458 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
4459 ext4_commit_super(sb
, 1);
4461 jbd2_journal_clear_err(journal
);
4462 jbd2_journal_update_sb_errno(journal
);
4467 * Force the running and committing transactions to commit,
4468 * and wait on the commit.
4470 int ext4_force_commit(struct super_block
*sb
)
4475 if (sb
->s_flags
& MS_RDONLY
)
4478 journal
= EXT4_SB(sb
)->s_journal
;
4480 ret
= ext4_journal_force_commit(journal
);
4485 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
4489 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4491 trace_ext4_sync_fs(sb
, wait
);
4492 flush_workqueue(sbi
->dio_unwritten_wq
);
4494 * Writeback quota in non-journalled quota case - journalled quota has
4497 dquot_writeback_dquots(sb
, -1);
4498 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
4500 jbd2_log_wait_commit(sbi
->s_journal
, target
);
4506 * LVM calls this function before a (read-only) snapshot is created. This
4507 * gives us a chance to flush the journal completely and mark the fs clean.
4509 * Note that only this function cannot bring a filesystem to be in a clean
4510 * state independently. It relies on upper layer to stop all data & metadata
4513 static int ext4_freeze(struct super_block
*sb
)
4518 if (sb
->s_flags
& MS_RDONLY
)
4521 journal
= EXT4_SB(sb
)->s_journal
;
4523 /* Now we set up the journal barrier. */
4524 jbd2_journal_lock_updates(journal
);
4527 * Don't clear the needs_recovery flag if we failed to flush
4530 error
= jbd2_journal_flush(journal
);
4534 /* Journal blocked and flushed, clear needs_recovery flag. */
4535 EXT4_CLEAR_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4536 error
= ext4_commit_super(sb
, 1);
4538 /* we rely on upper layer to stop further updates */
4539 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
4544 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4545 * flag here, even though the filesystem is not technically dirty yet.
4547 static int ext4_unfreeze(struct super_block
*sb
)
4549 if (sb
->s_flags
& MS_RDONLY
)
4552 /* Reset the needs_recovery flag before the fs is unlocked. */
4553 EXT4_SET_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_RECOVER
);
4554 ext4_commit_super(sb
, 1);
4559 * Structure to save mount options for ext4_remount's benefit
4561 struct ext4_mount_options
{
4562 unsigned long s_mount_opt
;
4563 unsigned long s_mount_opt2
;
4566 unsigned long s_commit_interval
;
4567 u32 s_min_batch_time
, s_max_batch_time
;
4570 char *s_qf_names
[MAXQUOTAS
];
4574 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
4576 struct ext4_super_block
*es
;
4577 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4578 unsigned long old_sb_flags
;
4579 struct ext4_mount_options old_opts
;
4580 int enable_quota
= 0;
4582 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
4587 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
4589 /* Store the original options */
4590 old_sb_flags
= sb
->s_flags
;
4591 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
4592 old_opts
.s_mount_opt2
= sbi
->s_mount_opt2
;
4593 old_opts
.s_resuid
= sbi
->s_resuid
;
4594 old_opts
.s_resgid
= sbi
->s_resgid
;
4595 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
4596 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
4597 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
4599 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
4600 for (i
= 0; i
< MAXQUOTAS
; i
++)
4601 old_opts
.s_qf_names
[i
] = sbi
->s_qf_names
[i
];
4603 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
4604 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
4607 * Allow the "check" option to be passed as a remount option.
4609 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
, 1)) {
4614 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
4615 ext4_abort(sb
, "Abort forced by user");
4617 sb
->s_flags
= (sb
->s_flags
& ~MS_POSIXACL
) |
4618 (test_opt(sb
, POSIX_ACL
) ? MS_POSIXACL
: 0);
4622 if (sbi
->s_journal
) {
4623 ext4_init_journal_params(sb
, sbi
->s_journal
);
4624 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
4627 if ((*flags
& MS_RDONLY
) != (sb
->s_flags
& MS_RDONLY
)) {
4628 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
4633 if (*flags
& MS_RDONLY
) {
4634 err
= dquot_suspend(sb
, -1);
4639 * First of all, the unconditional stuff we have to do
4640 * to disable replay of the journal when we next remount
4642 sb
->s_flags
|= MS_RDONLY
;
4645 * OK, test if we are remounting a valid rw partition
4646 * readonly, and if so set the rdonly flag and then
4647 * mark the partition as valid again.
4649 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
4650 (sbi
->s_mount_state
& EXT4_VALID_FS
))
4651 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
4654 ext4_mark_recovery_complete(sb
, es
);
4656 /* Make sure we can mount this feature set readwrite */
4657 if (!ext4_feature_set_ok(sb
, 0)) {
4662 * Make sure the group descriptor checksums
4663 * are sane. If they aren't, refuse to remount r/w.
4665 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
4666 struct ext4_group_desc
*gdp
=
4667 ext4_get_group_desc(sb
, g
, NULL
);
4669 if (!ext4_group_desc_csum_verify(sb
, g
, gdp
)) {
4670 ext4_msg(sb
, KERN_ERR
,
4671 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4672 g
, le16_to_cpu(ext4_group_desc_csum(sbi
, g
, gdp
)),
4673 le16_to_cpu(gdp
->bg_checksum
));
4680 * If we have an unprocessed orphan list hanging
4681 * around from a previously readonly bdev mount,
4682 * require a full umount/remount for now.
4684 if (es
->s_last_orphan
) {
4685 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
4686 "remount RDWR because of unprocessed "
4687 "orphan inode list. Please "
4688 "umount/remount instead");
4694 * Mounting a RDONLY partition read-write, so reread
4695 * and store the current valid flag. (It may have
4696 * been changed by e2fsck since we originally mounted
4700 ext4_clear_journal_err(sb
, es
);
4701 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
4702 if (!ext4_setup_super(sb
, es
, 0))
4703 sb
->s_flags
&= ~MS_RDONLY
;
4704 if (EXT4_HAS_INCOMPAT_FEATURE(sb
,
4705 EXT4_FEATURE_INCOMPAT_MMP
))
4706 if (ext4_multi_mount_protect(sb
,
4707 le64_to_cpu(es
->s_mmp_block
))) {
4716 * Reinitialize lazy itable initialization thread based on
4719 if ((sb
->s_flags
& MS_RDONLY
) || !test_opt(sb
, INIT_INODE_TABLE
))
4720 ext4_unregister_li_request(sb
);
4722 ext4_group_t first_not_zeroed
;
4723 first_not_zeroed
= ext4_has_uninit_itable(sb
);
4724 ext4_register_li_request(sb
, first_not_zeroed
);
4727 ext4_setup_system_zone(sb
);
4728 if (sbi
->s_journal
== NULL
)
4729 ext4_commit_super(sb
, 1);
4732 /* Release old quota file names */
4733 for (i
= 0; i
< MAXQUOTAS
; i
++)
4734 if (old_opts
.s_qf_names
[i
] &&
4735 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
4736 kfree(old_opts
.s_qf_names
[i
]);
4738 if (sb_any_quota_suspended(sb
))
4739 dquot_resume(sb
, -1);
4740 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
4741 EXT4_FEATURE_RO_COMPAT_QUOTA
)) {
4742 err
= ext4_enable_quotas(sb
);
4749 ext4_msg(sb
, KERN_INFO
, "re-mounted. Opts: %s", orig_data
);
4754 sb
->s_flags
= old_sb_flags
;
4755 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
4756 sbi
->s_mount_opt2
= old_opts
.s_mount_opt2
;
4757 sbi
->s_resuid
= old_opts
.s_resuid
;
4758 sbi
->s_resgid
= old_opts
.s_resgid
;
4759 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
4760 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
4761 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
4763 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
4764 for (i
= 0; i
< MAXQUOTAS
; i
++) {
4765 if (sbi
->s_qf_names
[i
] &&
4766 old_opts
.s_qf_names
[i
] != sbi
->s_qf_names
[i
])
4767 kfree(sbi
->s_qf_names
[i
]);
4768 sbi
->s_qf_names
[i
] = old_opts
.s_qf_names
[i
];
4775 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
4777 struct super_block
*sb
= dentry
->d_sb
;
4778 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4779 struct ext4_super_block
*es
= sbi
->s_es
;
4780 ext4_fsblk_t overhead
= 0;
4784 if (!test_opt(sb
, MINIX_DF
))
4785 overhead
= sbi
->s_overhead
;
4787 buf
->f_type
= EXT4_SUPER_MAGIC
;
4788 buf
->f_bsize
= sb
->s_blocksize
;
4789 buf
->f_blocks
= ext4_blocks_count(es
) - EXT4_C2B(sbi
, overhead
);
4790 bfree
= percpu_counter_sum_positive(&sbi
->s_freeclusters_counter
) -
4791 percpu_counter_sum_positive(&sbi
->s_dirtyclusters_counter
);
4792 /* prevent underflow in case that few free space is available */
4793 buf
->f_bfree
= EXT4_C2B(sbi
, max_t(s64
, bfree
, 0));
4794 buf
->f_bavail
= buf
->f_bfree
- ext4_r_blocks_count(es
);
4795 if (buf
->f_bfree
< ext4_r_blocks_count(es
))
4797 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
4798 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
4799 buf
->f_namelen
= EXT4_NAME_LEN
;
4800 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
4801 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
4802 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
4803 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
4808 /* Helper function for writing quotas on sync - we need to start transaction
4809 * before quota file is locked for write. Otherwise the are possible deadlocks:
4810 * Process 1 Process 2
4811 * ext4_create() quota_sync()
4812 * jbd2_journal_start() write_dquot()
4813 * dquot_initialize() down(dqio_mutex)
4814 * down(dqio_mutex) jbd2_journal_start()
4820 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
4822 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_id
.type
];
4825 static int ext4_write_dquot(struct dquot
*dquot
)
4829 struct inode
*inode
;
4831 inode
= dquot_to_inode(dquot
);
4832 handle
= ext4_journal_start(inode
,
4833 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
4835 return PTR_ERR(handle
);
4836 ret
= dquot_commit(dquot
);
4837 err
= ext4_journal_stop(handle
);
4843 static int ext4_acquire_dquot(struct dquot
*dquot
)
4848 handle
= ext4_journal_start(dquot_to_inode(dquot
),
4849 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
4851 return PTR_ERR(handle
);
4852 ret
= dquot_acquire(dquot
);
4853 err
= ext4_journal_stop(handle
);
4859 static int ext4_release_dquot(struct dquot
*dquot
)
4864 handle
= ext4_journal_start(dquot_to_inode(dquot
),
4865 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
4866 if (IS_ERR(handle
)) {
4867 /* Release dquot anyway to avoid endless cycle in dqput() */
4868 dquot_release(dquot
);
4869 return PTR_ERR(handle
);
4871 ret
= dquot_release(dquot
);
4872 err
= ext4_journal_stop(handle
);
4878 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
4880 /* Are we journaling quotas? */
4881 if (EXT4_SB(dquot
->dq_sb
)->s_qf_names
[USRQUOTA
] ||
4882 EXT4_SB(dquot
->dq_sb
)->s_qf_names
[GRPQUOTA
]) {
4883 dquot_mark_dquot_dirty(dquot
);
4884 return ext4_write_dquot(dquot
);
4886 return dquot_mark_dquot_dirty(dquot
);
4890 static int ext4_write_info(struct super_block
*sb
, int type
)
4895 /* Data block + inode block */
4896 handle
= ext4_journal_start(sb
->s_root
->d_inode
, 2);
4898 return PTR_ERR(handle
);
4899 ret
= dquot_commit_info(sb
, type
);
4900 err
= ext4_journal_stop(handle
);
4907 * Turn on quotas during mount time - we need to find
4908 * the quota file and such...
4910 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
4912 return dquot_quota_on_mount(sb
, EXT4_SB(sb
)->s_qf_names
[type
],
4913 EXT4_SB(sb
)->s_jquota_fmt
, type
);
4917 * Standard function to be called on quota_on
4919 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
4924 if (!test_opt(sb
, QUOTA
))
4927 /* Quotafile not on the same filesystem? */
4928 if (path
->dentry
->d_sb
!= sb
)
4930 /* Journaling quota? */
4931 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
4932 /* Quotafile not in fs root? */
4933 if (path
->dentry
->d_parent
!= sb
->s_root
)
4934 ext4_msg(sb
, KERN_WARNING
,
4935 "Quota file not on filesystem root. "
4936 "Journaled quota will not work");
4940 * When we journal data on quota file, we have to flush journal to see
4941 * all updates to the file when we bypass pagecache...
4943 if (EXT4_SB(sb
)->s_journal
&&
4944 ext4_should_journal_data(path
->dentry
->d_inode
)) {
4946 * We don't need to lock updates but journal_flush() could
4947 * otherwise be livelocked...
4949 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
4950 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
4951 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
4956 return dquot_quota_on(sb
, type
, format_id
, path
);
4959 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
4963 struct inode
*qf_inode
;
4964 unsigned long qf_inums
[MAXQUOTAS
] = {
4965 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
4966 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
)
4969 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
));
4971 if (!qf_inums
[type
])
4974 qf_inode
= ext4_iget(sb
, qf_inums
[type
]);
4975 if (IS_ERR(qf_inode
)) {
4976 ext4_error(sb
, "Bad quota inode # %lu", qf_inums
[type
]);
4977 return PTR_ERR(qf_inode
);
4980 err
= dquot_enable(qf_inode
, type
, format_id
, flags
);
4986 /* Enable usage tracking for all quota types. */
4987 static int ext4_enable_quotas(struct super_block
*sb
)
4990 unsigned long qf_inums
[MAXQUOTAS
] = {
4991 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
4992 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
)
4995 sb_dqopt(sb
)->flags
|= DQUOT_QUOTA_SYS_FILE
;
4996 for (type
= 0; type
< MAXQUOTAS
; type
++) {
4997 if (qf_inums
[type
]) {
4998 err
= ext4_quota_enable(sb
, type
, QFMT_VFS_V1
,
4999 DQUOT_USAGE_ENABLED
);
5002 "Failed to enable quota (type=%d) "
5003 "tracking. Please run e2fsck to fix.",
5013 * quota_on function that is used when QUOTA feature is set.
5015 static int ext4_quota_on_sysfile(struct super_block
*sb
, int type
,
5018 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
))
5022 * USAGE was enabled at mount time. Only need to enable LIMITS now.
5024 return ext4_quota_enable(sb
, type
, format_id
, DQUOT_LIMITS_ENABLED
);
5027 static int ext4_quota_off(struct super_block
*sb
, int type
)
5029 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5032 /* Force all delayed allocation blocks to be allocated.
5033 * Caller already holds s_umount sem */
5034 if (test_opt(sb
, DELALLOC
))
5035 sync_filesystem(sb
);
5040 /* Update modification times of quota files when userspace can
5041 * start looking at them */
5042 handle
= ext4_journal_start(inode
, 1);
5045 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
5046 ext4_mark_inode_dirty(handle
, inode
);
5047 ext4_journal_stop(handle
);
5050 return dquot_quota_off(sb
, type
);
5054 * quota_off function that is used when QUOTA feature is set.
5056 static int ext4_quota_off_sysfile(struct super_block
*sb
, int type
)
5058 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_QUOTA
))
5061 /* Disable only the limits. */
5062 return dquot_disable(sb
, type
, DQUOT_LIMITS_ENABLED
);
5065 /* Read data from quotafile - avoid pagecache and such because we cannot afford
5066 * acquiring the locks... As quota files are never truncated and quota code
5067 * itself serializes the operations (and no one else should touch the files)
5068 * we don't have to be afraid of races */
5069 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
5070 size_t len
, loff_t off
)
5072 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5073 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5075 int offset
= off
& (sb
->s_blocksize
- 1);
5078 struct buffer_head
*bh
;
5079 loff_t i_size
= i_size_read(inode
);
5083 if (off
+len
> i_size
)
5086 while (toread
> 0) {
5087 tocopy
= sb
->s_blocksize
- offset
< toread
?
5088 sb
->s_blocksize
- offset
: toread
;
5089 bh
= ext4_bread(NULL
, inode
, blk
, 0, &err
);
5092 if (!bh
) /* A hole? */
5093 memset(data
, 0, tocopy
);
5095 memcpy(data
, bh
->b_data
+offset
, tocopy
);
5105 /* Write to quotafile (we know the transaction is already started and has
5106 * enough credits) */
5107 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
5108 const char *data
, size_t len
, loff_t off
)
5110 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
5111 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
5113 int offset
= off
& (sb
->s_blocksize
- 1);
5114 struct buffer_head
*bh
;
5115 handle_t
*handle
= journal_current_handle();
5117 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
5118 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5119 " cancelled because transaction is not started",
5120 (unsigned long long)off
, (unsigned long long)len
);
5124 * Since we account only one data block in transaction credits,
5125 * then it is impossible to cross a block boundary.
5127 if (sb
->s_blocksize
- offset
< len
) {
5128 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
5129 " cancelled because not block aligned",
5130 (unsigned long long)off
, (unsigned long long)len
);
5134 bh
= ext4_bread(handle
, inode
, blk
, 1, &err
);
5137 err
= ext4_journal_get_write_access(handle
, bh
);
5143 memcpy(bh
->b_data
+offset
, data
, len
);
5144 flush_dcache_page(bh
->b_page
);
5146 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
5151 if (inode
->i_size
< off
+ len
) {
5152 i_size_write(inode
, off
+ len
);
5153 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
5154 ext4_mark_inode_dirty(handle
, inode
);
5161 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
5162 const char *dev_name
, void *data
)
5164 return mount_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
);
5167 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5168 static inline void register_as_ext2(void)
5170 int err
= register_filesystem(&ext2_fs_type
);
5173 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
5176 static inline void unregister_as_ext2(void)
5178 unregister_filesystem(&ext2_fs_type
);
5181 static inline int ext2_feature_set_ok(struct super_block
*sb
)
5183 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT2_FEATURE_INCOMPAT_SUPP
))
5185 if (sb
->s_flags
& MS_RDONLY
)
5187 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT2_FEATURE_RO_COMPAT_SUPP
))
5191 MODULE_ALIAS("ext2");
5193 static inline void register_as_ext2(void) { }
5194 static inline void unregister_as_ext2(void) { }
5195 static inline int ext2_feature_set_ok(struct super_block
*sb
) { return 0; }
5198 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5199 static inline void register_as_ext3(void)
5201 int err
= register_filesystem(&ext3_fs_type
);
5204 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
5207 static inline void unregister_as_ext3(void)
5209 unregister_filesystem(&ext3_fs_type
);
5212 static inline int ext3_feature_set_ok(struct super_block
*sb
)
5214 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, ~EXT3_FEATURE_INCOMPAT_SUPP
))
5216 if (!EXT4_HAS_COMPAT_FEATURE(sb
, EXT4_FEATURE_COMPAT_HAS_JOURNAL
))
5218 if (sb
->s_flags
& MS_RDONLY
)
5220 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
, ~EXT3_FEATURE_RO_COMPAT_SUPP
))
5224 MODULE_ALIAS("ext3");
5226 static inline void register_as_ext3(void) { }
5227 static inline void unregister_as_ext3(void) { }
5228 static inline int ext3_feature_set_ok(struct super_block
*sb
) { return 0; }
5231 static struct file_system_type ext4_fs_type
= {
5232 .owner
= THIS_MODULE
,
5234 .mount
= ext4_mount
,
5235 .kill_sb
= kill_block_super
,
5236 .fs_flags
= FS_REQUIRES_DEV
,
5239 static int __init
ext4_init_feat_adverts(void)
5241 struct ext4_features
*ef
;
5244 ef
= kzalloc(sizeof(struct ext4_features
), GFP_KERNEL
);
5248 ef
->f_kobj
.kset
= ext4_kset
;
5249 init_completion(&ef
->f_kobj_unregister
);
5250 ret
= kobject_init_and_add(&ef
->f_kobj
, &ext4_feat_ktype
, NULL
,
5263 static void ext4_exit_feat_adverts(void)
5265 kobject_put(&ext4_feat
->f_kobj
);
5266 wait_for_completion(&ext4_feat
->f_kobj_unregister
);
5270 /* Shared across all ext4 file systems */
5271 wait_queue_head_t ext4__ioend_wq
[EXT4_WQ_HASH_SZ
];
5272 struct mutex ext4__aio_mutex
[EXT4_WQ_HASH_SZ
];
5274 static int __init
ext4_init_fs(void)
5278 ext4_li_info
= NULL
;
5279 mutex_init(&ext4_li_mtx
);
5281 /* Build-time check for flags consistency */
5282 ext4_check_flag_values();
5284 for (i
= 0; i
< EXT4_WQ_HASH_SZ
; i
++) {
5285 mutex_init(&ext4__aio_mutex
[i
]);
5286 init_waitqueue_head(&ext4__ioend_wq
[i
]);
5289 err
= ext4_init_es();
5293 err
= ext4_init_pageio();
5297 err
= ext4_init_system_zone();
5300 ext4_kset
= kset_create_and_add("ext4", NULL
, fs_kobj
);
5305 ext4_proc_root
= proc_mkdir("fs/ext4", NULL
);
5307 err
= ext4_init_feat_adverts();
5311 err
= ext4_init_mballoc();
5315 err
= ext4_init_xattr();
5318 err
= init_inodecache();
5323 err
= register_filesystem(&ext4_fs_type
);
5329 unregister_as_ext2();
5330 unregister_as_ext3();
5331 destroy_inodecache();
5335 ext4_exit_mballoc();
5337 ext4_exit_feat_adverts();
5340 remove_proc_entry("fs/ext4", NULL
);
5341 kset_unregister(ext4_kset
);
5343 ext4_exit_system_zone();
5352 static void __exit
ext4_exit_fs(void)
5354 ext4_destroy_lazyinit_thread();
5355 unregister_as_ext2();
5356 unregister_as_ext3();
5357 unregister_filesystem(&ext4_fs_type
);
5358 destroy_inodecache();
5360 ext4_exit_mballoc();
5361 ext4_exit_feat_adverts();
5362 remove_proc_entry("fs/ext4", NULL
);
5363 kset_unregister(ext4_kset
);
5364 ext4_exit_system_zone();
5368 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5369 MODULE_DESCRIPTION("Fourth Extended Filesystem");
5370 MODULE_LICENSE("GPL");
5371 module_init(ext4_init_fs
)
5372 module_exit(ext4_exit_fs
)