1 // SPDX-License-Identifier: GPL-2.0
3 * linux/fs/ext4/super.c
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
12 * linux/fs/minix/inode.c
14 * Copyright (C) 1991, 1992 Linus Torvalds
16 * Big-endian to little-endian byte-swapping/bitmaps by
17 * David S. Miller (davem@caip.rutgers.edu), 1995
20 #include <linux/module.h>
21 #include <linux/string.h>
23 #include <linux/time.h>
24 #include <linux/vmalloc.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/blkdev.h>
28 #include <linux/backing-dev.h>
29 #include <linux/parser.h>
30 #include <linux/buffer_head.h>
31 #include <linux/exportfs.h>
32 #include <linux/vfs.h>
33 #include <linux/random.h>
34 #include <linux/mount.h>
35 #include <linux/namei.h>
36 #include <linux/quotaops.h>
37 #include <linux/seq_file.h>
38 #include <linux/ctype.h>
39 #include <linux/log2.h>
40 #include <linux/crc16.h>
41 #include <linux/dax.h>
42 #include <linux/cleancache.h>
43 #include <linux/uaccess.h>
44 #include <linux/iversion.h>
45 #include <linux/unicode.h>
46 #include <linux/part_stat.h>
47 #include <linux/kthread.h>
48 #include <linux/freezer.h>
51 #include "ext4_extents.h" /* Needed for trace points definition */
52 #include "ext4_jbd2.h"
58 #define CREATE_TRACE_POINTS
59 #include <trace/events/ext4.h>
61 static struct ext4_lazy_init
*ext4_li_info
;
62 static struct mutex ext4_li_mtx
;
63 static struct ratelimit_state ext4_mount_msg_ratelimit
;
65 static int ext4_load_journal(struct super_block
*, struct ext4_super_block
*,
66 unsigned long journal_devnum
);
67 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
);
68 static int ext4_commit_super(struct super_block
*sb
, int sync
);
69 static void ext4_mark_recovery_complete(struct super_block
*sb
,
70 struct ext4_super_block
*es
);
71 static void ext4_clear_journal_err(struct super_block
*sb
,
72 struct ext4_super_block
*es
);
73 static int ext4_sync_fs(struct super_block
*sb
, int wait
);
74 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
);
75 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
);
76 static int ext4_unfreeze(struct super_block
*sb
);
77 static int ext4_freeze(struct super_block
*sb
);
78 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
79 const char *dev_name
, void *data
);
80 static inline int ext2_feature_set_ok(struct super_block
*sb
);
81 static inline int ext3_feature_set_ok(struct super_block
*sb
);
82 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
);
83 static void ext4_destroy_lazyinit_thread(void);
84 static void ext4_unregister_li_request(struct super_block
*sb
);
85 static void ext4_clear_request_list(void);
86 static struct inode
*ext4_get_journal_inode(struct super_block
*sb
,
87 unsigned int journal_inum
);
92 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
93 * i_mmap_rwsem (inode->i_mmap_rwsem)!
96 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
97 * page lock -> i_data_sem (rw)
99 * buffered write path:
100 * sb_start_write -> i_mutex -> mmap_sem
101 * sb_start_write -> i_mutex -> transaction start -> page lock ->
105 * sb_start_write -> i_mutex -> i_mmap_sem (w) -> i_mmap_rwsem (w) -> page lock
106 * sb_start_write -> i_mutex -> i_mmap_sem (w) -> transaction start ->
110 * sb_start_write -> i_mutex -> mmap_sem
111 * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw)
114 * transaction start -> page lock(s) -> i_data_sem (rw)
117 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
118 static struct file_system_type ext2_fs_type
= {
119 .owner
= THIS_MODULE
,
122 .kill_sb
= kill_block_super
,
123 .fs_flags
= FS_REQUIRES_DEV
,
125 MODULE_ALIAS_FS("ext2");
126 MODULE_ALIAS("ext2");
127 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
129 #define IS_EXT2_SB(sb) (0)
133 static struct file_system_type ext3_fs_type
= {
134 .owner
= THIS_MODULE
,
137 .kill_sb
= kill_block_super
,
138 .fs_flags
= FS_REQUIRES_DEV
,
140 MODULE_ALIAS_FS("ext3");
141 MODULE_ALIAS("ext3");
142 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
145 * This works like sb_bread() except it uses ERR_PTR for error
146 * returns. Currently with sb_bread it's impossible to distinguish
147 * between ENOMEM and EIO situations (since both result in a NULL
151 ext4_sb_bread(struct super_block
*sb
, sector_t block
, int op_flags
)
153 struct buffer_head
*bh
= sb_getblk(sb
, block
);
156 return ERR_PTR(-ENOMEM
);
157 if (ext4_buffer_uptodate(bh
))
159 ll_rw_block(REQ_OP_READ
, REQ_META
| op_flags
, 1, &bh
);
161 if (buffer_uptodate(bh
))
164 return ERR_PTR(-EIO
);
167 static int ext4_verify_csum_type(struct super_block
*sb
,
168 struct ext4_super_block
*es
)
170 if (!ext4_has_feature_metadata_csum(sb
))
173 return es
->s_checksum_type
== EXT4_CRC32C_CHKSUM
;
176 static __le32
ext4_superblock_csum(struct super_block
*sb
,
177 struct ext4_super_block
*es
)
179 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
180 int offset
= offsetof(struct ext4_super_block
, s_checksum
);
183 csum
= ext4_chksum(sbi
, ~0, (char *)es
, offset
);
185 return cpu_to_le32(csum
);
188 static int ext4_superblock_csum_verify(struct super_block
*sb
,
189 struct ext4_super_block
*es
)
191 if (!ext4_has_metadata_csum(sb
))
194 return es
->s_checksum
== ext4_superblock_csum(sb
, es
);
197 void ext4_superblock_csum_set(struct super_block
*sb
)
199 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
201 if (!ext4_has_metadata_csum(sb
))
204 es
->s_checksum
= ext4_superblock_csum(sb
, es
);
207 ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
208 struct ext4_group_desc
*bg
)
210 return le32_to_cpu(bg
->bg_block_bitmap_lo
) |
211 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
212 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
215 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
216 struct ext4_group_desc
*bg
)
218 return le32_to_cpu(bg
->bg_inode_bitmap_lo
) |
219 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
220 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
223 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
224 struct ext4_group_desc
*bg
)
226 return le32_to_cpu(bg
->bg_inode_table_lo
) |
227 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
228 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
231 __u32
ext4_free_group_clusters(struct super_block
*sb
,
232 struct ext4_group_desc
*bg
)
234 return le16_to_cpu(bg
->bg_free_blocks_count_lo
) |
235 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
236 (__u32
)le16_to_cpu(bg
->bg_free_blocks_count_hi
) << 16 : 0);
239 __u32
ext4_free_inodes_count(struct super_block
*sb
,
240 struct ext4_group_desc
*bg
)
242 return le16_to_cpu(bg
->bg_free_inodes_count_lo
) |
243 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
244 (__u32
)le16_to_cpu(bg
->bg_free_inodes_count_hi
) << 16 : 0);
247 __u32
ext4_used_dirs_count(struct super_block
*sb
,
248 struct ext4_group_desc
*bg
)
250 return le16_to_cpu(bg
->bg_used_dirs_count_lo
) |
251 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
252 (__u32
)le16_to_cpu(bg
->bg_used_dirs_count_hi
) << 16 : 0);
255 __u32
ext4_itable_unused_count(struct super_block
*sb
,
256 struct ext4_group_desc
*bg
)
258 return le16_to_cpu(bg
->bg_itable_unused_lo
) |
259 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
260 (__u32
)le16_to_cpu(bg
->bg_itable_unused_hi
) << 16 : 0);
263 void ext4_block_bitmap_set(struct super_block
*sb
,
264 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
266 bg
->bg_block_bitmap_lo
= cpu_to_le32((u32
)blk
);
267 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
268 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
271 void ext4_inode_bitmap_set(struct super_block
*sb
,
272 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
274 bg
->bg_inode_bitmap_lo
= cpu_to_le32((u32
)blk
);
275 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
276 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
279 void ext4_inode_table_set(struct super_block
*sb
,
280 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
282 bg
->bg_inode_table_lo
= cpu_to_le32((u32
)blk
);
283 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
284 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
287 void ext4_free_group_clusters_set(struct super_block
*sb
,
288 struct ext4_group_desc
*bg
, __u32 count
)
290 bg
->bg_free_blocks_count_lo
= cpu_to_le16((__u16
)count
);
291 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
292 bg
->bg_free_blocks_count_hi
= cpu_to_le16(count
>> 16);
295 void ext4_free_inodes_set(struct super_block
*sb
,
296 struct ext4_group_desc
*bg
, __u32 count
)
298 bg
->bg_free_inodes_count_lo
= cpu_to_le16((__u16
)count
);
299 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
300 bg
->bg_free_inodes_count_hi
= cpu_to_le16(count
>> 16);
303 void ext4_used_dirs_set(struct super_block
*sb
,
304 struct ext4_group_desc
*bg
, __u32 count
)
306 bg
->bg_used_dirs_count_lo
= cpu_to_le16((__u16
)count
);
307 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
308 bg
->bg_used_dirs_count_hi
= cpu_to_le16(count
>> 16);
311 void ext4_itable_unused_set(struct super_block
*sb
,
312 struct ext4_group_desc
*bg
, __u32 count
)
314 bg
->bg_itable_unused_lo
= cpu_to_le16((__u16
)count
);
315 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
316 bg
->bg_itable_unused_hi
= cpu_to_le16(count
>> 16);
319 static void __ext4_update_tstamp(__le32
*lo
, __u8
*hi
)
321 time64_t now
= ktime_get_real_seconds();
323 now
= clamp_val(now
, 0, (1ull << 40) - 1);
325 *lo
= cpu_to_le32(lower_32_bits(now
));
326 *hi
= upper_32_bits(now
);
329 static time64_t
__ext4_get_tstamp(__le32
*lo
, __u8
*hi
)
331 return ((time64_t
)(*hi
) << 32) + le32_to_cpu(*lo
);
333 #define ext4_update_tstamp(es, tstamp) \
334 __ext4_update_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
335 #define ext4_get_tstamp(es, tstamp) \
336 __ext4_get_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
338 static void __save_error_info(struct super_block
*sb
, int error
,
339 __u32 ino
, __u64 block
,
340 const char *func
, unsigned int line
)
342 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
345 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
346 if (bdev_read_only(sb
->s_bdev
))
348 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
349 ext4_update_tstamp(es
, s_last_error_time
);
350 strncpy(es
->s_last_error_func
, func
, sizeof(es
->s_last_error_func
));
351 es
->s_last_error_line
= cpu_to_le32(line
);
352 es
->s_last_error_ino
= cpu_to_le32(ino
);
353 es
->s_last_error_block
= cpu_to_le64(block
);
359 err
= EXT4_ERR_ENOMEM
;
362 err
= EXT4_ERR_EFSBADCRC
;
366 err
= EXT4_ERR_EFSCORRUPTED
;
369 err
= EXT4_ERR_ENOSPC
;
372 err
= EXT4_ERR_ENOKEY
;
375 err
= EXT4_ERR_EROFS
;
378 err
= EXT4_ERR_EFBIG
;
381 err
= EXT4_ERR_EEXIST
;
384 err
= EXT4_ERR_ERANGE
;
387 err
= EXT4_ERR_EOVERFLOW
;
390 err
= EXT4_ERR_EBUSY
;
393 err
= EXT4_ERR_ENOTDIR
;
396 err
= EXT4_ERR_ENOTEMPTY
;
399 err
= EXT4_ERR_ESHUTDOWN
;
402 err
= EXT4_ERR_EFAULT
;
405 err
= EXT4_ERR_UNKNOWN
;
407 es
->s_last_error_errcode
= err
;
408 if (!es
->s_first_error_time
) {
409 es
->s_first_error_time
= es
->s_last_error_time
;
410 es
->s_first_error_time_hi
= es
->s_last_error_time_hi
;
411 strncpy(es
->s_first_error_func
, func
,
412 sizeof(es
->s_first_error_func
));
413 es
->s_first_error_line
= cpu_to_le32(line
);
414 es
->s_first_error_ino
= es
->s_last_error_ino
;
415 es
->s_first_error_block
= es
->s_last_error_block
;
416 es
->s_first_error_errcode
= es
->s_last_error_errcode
;
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
, int error
,
428 __u32 ino
, __u64 block
,
429 const char *func
, unsigned int line
)
431 __save_error_info(sb
, error
, ino
, block
, func
, line
);
432 if (!bdev_read_only(sb
->s_bdev
))
433 ext4_commit_super(sb
, 1);
437 * The del_gendisk() function uninitializes the disk-specific data
438 * structures, including the bdi structure, without telling anyone
439 * else. Once this happens, any attempt to call mark_buffer_dirty()
440 * (for example, by ext4_commit_super), will cause a kernel OOPS.
441 * This is a kludge to prevent these oops until we can put in a proper
442 * hook in del_gendisk() to inform the VFS and file system layers.
444 static int block_device_ejected(struct super_block
*sb
)
446 struct inode
*bd_inode
= sb
->s_bdev
->bd_inode
;
447 struct backing_dev_info
*bdi
= inode_to_bdi(bd_inode
);
449 return bdi
->dev
== NULL
;
452 static void ext4_journal_commit_callback(journal_t
*journal
, transaction_t
*txn
)
454 struct super_block
*sb
= journal
->j_private
;
455 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
456 int error
= is_journal_aborted(journal
);
457 struct ext4_journal_cb_entry
*jce
;
459 BUG_ON(txn
->t_state
== T_FINISHED
);
461 ext4_process_freed_data(sb
, txn
->t_tid
);
463 spin_lock(&sbi
->s_md_lock
);
464 while (!list_empty(&txn
->t_private_list
)) {
465 jce
= list_entry(txn
->t_private_list
.next
,
466 struct ext4_journal_cb_entry
, jce_list
);
467 list_del_init(&jce
->jce_list
);
468 spin_unlock(&sbi
->s_md_lock
);
469 jce
->jce_func(sb
, jce
, error
);
470 spin_lock(&sbi
->s_md_lock
);
472 spin_unlock(&sbi
->s_md_lock
);
475 static bool system_going_down(void)
477 return system_state
== SYSTEM_HALT
|| system_state
== SYSTEM_POWER_OFF
478 || system_state
== SYSTEM_RESTART
;
481 /* Deal with the reporting of failure conditions on a filesystem such as
482 * inconsistencies detected or read IO failures.
484 * On ext2, we can store the error state of the filesystem in the
485 * superblock. That is not possible on ext4, because we may have other
486 * write ordering constraints on the superblock which prevent us from
487 * writing it out straight away; and given that the journal is about to
488 * be aborted, we can't rely on the current, or future, transactions to
489 * write out the superblock safely.
491 * We'll just use the jbd2_journal_abort() error code to record an error in
492 * the journal instead. On recovery, the journal will complain about
493 * that error until we've noted it down and cleared it.
496 static void ext4_handle_error(struct super_block
*sb
)
498 if (test_opt(sb
, WARN_ON_ERROR
))
504 if (!test_opt(sb
, ERRORS_CONT
)) {
505 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
507 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
509 jbd2_journal_abort(journal
, -EIO
);
512 * We force ERRORS_RO behavior when system is rebooting. Otherwise we
513 * could panic during 'reboot -f' as the underlying device got already
516 if (test_opt(sb
, ERRORS_RO
) || system_going_down()) {
517 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
519 * Make sure updated value of ->s_mount_flags will be visible
520 * before ->s_flags update
523 sb
->s_flags
|= SB_RDONLY
;
524 } else if (test_opt(sb
, ERRORS_PANIC
)) {
525 if (EXT4_SB(sb
)->s_journal
&&
526 !(EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_REC_ERR
))
528 panic("EXT4-fs (device %s): panic forced after error\n",
533 #define ext4_error_ratelimit(sb) \
534 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
537 void __ext4_error(struct super_block
*sb
, const char *function
,
538 unsigned int line
, int error
, __u64 block
,
539 const char *fmt
, ...)
541 struct va_format vaf
;
544 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
547 trace_ext4_error(sb
, function
, line
);
548 if (ext4_error_ratelimit(sb
)) {
553 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
554 sb
->s_id
, function
, line
, current
->comm
, &vaf
);
557 save_error_info(sb
, error
, 0, block
, function
, line
);
558 ext4_handle_error(sb
);
561 void __ext4_error_inode(struct inode
*inode
, const char *function
,
562 unsigned int line
, ext4_fsblk_t block
, int error
,
563 const char *fmt
, ...)
566 struct va_format vaf
;
568 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode
->i_sb
))))
571 trace_ext4_error(inode
->i_sb
, function
, line
);
572 if (ext4_error_ratelimit(inode
->i_sb
)) {
577 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
578 "inode #%lu: block %llu: comm %s: %pV\n",
579 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
580 block
, current
->comm
, &vaf
);
582 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
583 "inode #%lu: comm %s: %pV\n",
584 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
585 current
->comm
, &vaf
);
588 save_error_info(inode
->i_sb
, error
, inode
->i_ino
, block
,
590 ext4_handle_error(inode
->i_sb
);
593 void __ext4_error_file(struct file
*file
, const char *function
,
594 unsigned int line
, ext4_fsblk_t block
,
595 const char *fmt
, ...)
598 struct va_format vaf
;
599 struct inode
*inode
= file_inode(file
);
600 char pathname
[80], *path
;
602 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode
->i_sb
))))
605 trace_ext4_error(inode
->i_sb
, function
, line
);
606 if (ext4_error_ratelimit(inode
->i_sb
)) {
607 path
= file_path(file
, pathname
, sizeof(pathname
));
615 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
616 "block %llu: comm %s: path %s: %pV\n",
617 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
618 block
, current
->comm
, path
, &vaf
);
621 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
622 "comm %s: path %s: %pV\n",
623 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
624 current
->comm
, path
, &vaf
);
627 save_error_info(inode
->i_sb
, EFSCORRUPTED
, inode
->i_ino
, block
,
629 ext4_handle_error(inode
->i_sb
);
632 const char *ext4_decode_error(struct super_block
*sb
, int errno
,
639 errstr
= "Corrupt filesystem";
642 errstr
= "Filesystem failed CRC";
645 errstr
= "IO failure";
648 errstr
= "Out of memory";
651 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
652 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
653 errstr
= "Journal has aborted";
655 errstr
= "Readonly filesystem";
658 /* If the caller passed in an extra buffer for unknown
659 * errors, textualise them now. Else we just return
662 /* Check for truncated error codes... */
663 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
672 /* __ext4_std_error decodes expected errors from journaling functions
673 * automatically and invokes the appropriate error response. */
675 void __ext4_std_error(struct super_block
*sb
, const char *function
,
676 unsigned int line
, int errno
)
681 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
684 /* Special case: if the error is EROFS, and we're not already
685 * inside a transaction, then there's really no point in logging
687 if (errno
== -EROFS
&& journal_current_handle() == NULL
&& sb_rdonly(sb
))
690 if (ext4_error_ratelimit(sb
)) {
691 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
692 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s:%d: %s\n",
693 sb
->s_id
, function
, line
, errstr
);
696 save_error_info(sb
, -errno
, 0, 0, function
, line
);
697 ext4_handle_error(sb
);
701 * ext4_abort is a much stronger failure handler than ext4_error. The
702 * abort function may be used to deal with unrecoverable failures such
703 * as journal IO errors or ENOMEM at a critical moment in log management.
705 * We unconditionally force the filesystem into an ABORT|READONLY state,
706 * unless the error response on the fs has been set to panic in which
707 * case we take the easy way out and panic immediately.
710 void __ext4_abort(struct super_block
*sb
, const char *function
,
711 unsigned int line
, int error
, const char *fmt
, ...)
713 struct va_format vaf
;
716 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
719 save_error_info(sb
, error
, 0, 0, function
, line
);
723 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: %pV\n",
724 sb
->s_id
, function
, line
, &vaf
);
727 if (sb_rdonly(sb
) == 0) {
728 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
729 EXT4_SB(sb
)->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
731 * Make sure updated value of ->s_mount_flags will be visible
732 * before ->s_flags update
735 sb
->s_flags
|= SB_RDONLY
;
736 if (EXT4_SB(sb
)->s_journal
)
737 jbd2_journal_abort(EXT4_SB(sb
)->s_journal
, -EIO
);
739 if (test_opt(sb
, ERRORS_PANIC
) && !system_going_down()) {
740 if (EXT4_SB(sb
)->s_journal
&&
741 !(EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_REC_ERR
))
743 panic("EXT4-fs panic from previous error\n");
747 void __ext4_msg(struct super_block
*sb
,
748 const char *prefix
, const char *fmt
, ...)
750 struct va_format vaf
;
753 if (!___ratelimit(&(EXT4_SB(sb
)->s_msg_ratelimit_state
), "EXT4-fs"))
759 printk("%sEXT4-fs (%s): %pV\n", prefix
, sb
->s_id
, &vaf
);
763 #define ext4_warning_ratelimit(sb) \
764 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
767 void __ext4_warning(struct super_block
*sb
, const char *function
,
768 unsigned int line
, const char *fmt
, ...)
770 struct va_format vaf
;
773 if (!ext4_warning_ratelimit(sb
))
779 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: %pV\n",
780 sb
->s_id
, function
, line
, &vaf
);
784 void __ext4_warning_inode(const struct inode
*inode
, const char *function
,
785 unsigned int line
, const char *fmt
, ...)
787 struct va_format vaf
;
790 if (!ext4_warning_ratelimit(inode
->i_sb
))
796 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: "
797 "inode #%lu: comm %s: %pV\n", inode
->i_sb
->s_id
,
798 function
, line
, inode
->i_ino
, current
->comm
, &vaf
);
802 void __ext4_grp_locked_error(const char *function
, unsigned int line
,
803 struct super_block
*sb
, ext4_group_t grp
,
804 unsigned long ino
, ext4_fsblk_t block
,
805 const char *fmt
, ...)
809 struct va_format vaf
;
812 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
815 trace_ext4_error(sb
, function
, line
);
816 __save_error_info(sb
, EFSCORRUPTED
, ino
, block
, function
, line
);
818 if (ext4_error_ratelimit(sb
)) {
822 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: group %u, ",
823 sb
->s_id
, function
, line
, grp
);
825 printk(KERN_CONT
"inode %lu: ", ino
);
827 printk(KERN_CONT
"block %llu:",
828 (unsigned long long) block
);
829 printk(KERN_CONT
"%pV\n", &vaf
);
833 if (test_opt(sb
, WARN_ON_ERROR
))
836 if (test_opt(sb
, ERRORS_CONT
)) {
837 ext4_commit_super(sb
, 0);
841 ext4_unlock_group(sb
, grp
);
842 ext4_commit_super(sb
, 1);
843 ext4_handle_error(sb
);
845 * We only get here in the ERRORS_RO case; relocking the group
846 * may be dangerous, but nothing bad will happen since the
847 * filesystem will have already been marked read/only and the
848 * journal has been aborted. We return 1 as a hint to callers
849 * who might what to use the return value from
850 * ext4_grp_locked_error() to distinguish between the
851 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
852 * aggressively from the ext4 function in question, with a
853 * more appropriate error code.
855 ext4_lock_group(sb
, grp
);
859 void ext4_mark_group_bitmap_corrupted(struct super_block
*sb
,
863 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
864 struct ext4_group_info
*grp
= ext4_get_group_info(sb
, group
);
865 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, group
, NULL
);
868 if (flags
& EXT4_GROUP_INFO_BBITMAP_CORRUPT
) {
869 ret
= ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT
,
872 percpu_counter_sub(&sbi
->s_freeclusters_counter
,
876 if (flags
& EXT4_GROUP_INFO_IBITMAP_CORRUPT
) {
877 ret
= ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT
,
882 count
= ext4_free_inodes_count(sb
, gdp
);
883 percpu_counter_sub(&sbi
->s_freeinodes_counter
,
889 void ext4_update_dynamic_rev(struct super_block
*sb
)
891 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
893 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
897 "updating to rev %d because of new feature flag, "
898 "running e2fsck is recommended",
901 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
902 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
903 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
904 /* leave es->s_feature_*compat flags alone */
905 /* es->s_uuid will be set by e2fsck if empty */
908 * The rest of the superblock fields should be zero, and if not it
909 * means they are likely already in use, so leave them alone. We
910 * can leave it up to e2fsck to clean up any inconsistencies there.
915 * Open the external journal device
917 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
919 struct block_device
*bdev
;
921 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
, sb
);
927 ext4_msg(sb
, KERN_ERR
,
928 "failed to open journal device unknown-block(%u,%u) %ld",
929 MAJOR(dev
), MINOR(dev
), PTR_ERR(bdev
));
934 * Release the journal device
936 static void ext4_blkdev_put(struct block_device
*bdev
)
938 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
941 static void ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
943 struct block_device
*bdev
;
944 bdev
= sbi
->journal_bdev
;
946 ext4_blkdev_put(bdev
);
947 sbi
->journal_bdev
= NULL
;
951 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
953 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
956 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
960 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
961 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
963 printk(KERN_ERR
"sb_info orphan list:\n");
964 list_for_each(l
, &sbi
->s_orphan
) {
965 struct inode
*inode
= orphan_list_entry(l
);
967 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
968 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
969 inode
->i_mode
, inode
->i_nlink
,
975 static int ext4_quota_off(struct super_block
*sb
, int type
);
977 static inline void ext4_quota_off_umount(struct super_block
*sb
)
981 /* Use our quota_off function to clear inode flags etc. */
982 for (type
= 0; type
< EXT4_MAXQUOTAS
; type
++)
983 ext4_quota_off(sb
, type
);
987 * This is a helper function which is used in the mount/remount
988 * codepaths (which holds s_umount) to fetch the quota file name.
990 static inline char *get_qf_name(struct super_block
*sb
,
991 struct ext4_sb_info
*sbi
,
994 return rcu_dereference_protected(sbi
->s_qf_names
[type
],
995 lockdep_is_held(&sb
->s_umount
));
998 static inline void ext4_quota_off_umount(struct super_block
*sb
)
1003 static void ext4_put_super(struct super_block
*sb
)
1005 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1006 struct ext4_super_block
*es
= sbi
->s_es
;
1007 struct buffer_head
**group_desc
;
1008 struct flex_groups
**flex_groups
;
1012 ext4_unregister_li_request(sb
);
1013 ext4_quota_off_umount(sb
);
1015 destroy_workqueue(sbi
->rsv_conversion_wq
);
1018 * Unregister sysfs before destroying jbd2 journal.
1019 * Since we could still access attr_journal_task attribute via sysfs
1020 * path which could have sbi->s_journal->j_task as NULL
1022 ext4_unregister_sysfs(sb
);
1024 if (sbi
->s_journal
) {
1025 aborted
= is_journal_aborted(sbi
->s_journal
);
1026 err
= jbd2_journal_destroy(sbi
->s_journal
);
1027 sbi
->s_journal
= NULL
;
1028 if ((err
< 0) && !aborted
) {
1029 ext4_abort(sb
, -err
, "Couldn't clean up the journal");
1033 ext4_es_unregister_shrinker(sbi
);
1034 del_timer_sync(&sbi
->s_err_report
);
1035 ext4_release_system_zone(sb
);
1036 ext4_mb_release(sb
);
1037 ext4_ext_release(sb
);
1039 if (!sb_rdonly(sb
) && !aborted
) {
1040 ext4_clear_feature_journal_needs_recovery(sb
);
1041 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
1044 ext4_commit_super(sb
, 1);
1047 group_desc
= rcu_dereference(sbi
->s_group_desc
);
1048 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
1049 brelse(group_desc
[i
]);
1051 flex_groups
= rcu_dereference(sbi
->s_flex_groups
);
1053 for (i
= 0; i
< sbi
->s_flex_groups_allocated
; i
++)
1054 kvfree(flex_groups
[i
]);
1055 kvfree(flex_groups
);
1058 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
1059 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
1060 percpu_counter_destroy(&sbi
->s_dirs_counter
);
1061 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
1062 percpu_free_rwsem(&sbi
->s_writepages_rwsem
);
1064 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
1065 kfree(get_qf_name(sb
, sbi
, i
));
1068 /* Debugging code just in case the in-memory inode orphan list
1069 * isn't empty. The on-disk one can be non-empty if we've
1070 * detected an error and taken the fs readonly, but the
1071 * in-memory list had better be clean by this point. */
1072 if (!list_empty(&sbi
->s_orphan
))
1073 dump_orphan_list(sb
, sbi
);
1074 J_ASSERT(list_empty(&sbi
->s_orphan
));
1076 sync_blockdev(sb
->s_bdev
);
1077 invalidate_bdev(sb
->s_bdev
);
1078 if (sbi
->journal_bdev
&& sbi
->journal_bdev
!= sb
->s_bdev
) {
1080 * Invalidate the journal device's buffers. We don't want them
1081 * floating about in memory - the physical journal device may
1082 * hotswapped, and it breaks the `ro-after' testing code.
1084 sync_blockdev(sbi
->journal_bdev
);
1085 invalidate_bdev(sbi
->journal_bdev
);
1086 ext4_blkdev_remove(sbi
);
1089 ext4_xattr_destroy_cache(sbi
->s_ea_inode_cache
);
1090 sbi
->s_ea_inode_cache
= NULL
;
1092 ext4_xattr_destroy_cache(sbi
->s_ea_block_cache
);
1093 sbi
->s_ea_block_cache
= NULL
;
1096 kthread_stop(sbi
->s_mmp_tsk
);
1098 sb
->s_fs_info
= NULL
;
1100 * Now that we are completely done shutting down the
1101 * superblock, we need to actually destroy the kobject.
1103 kobject_put(&sbi
->s_kobj
);
1104 wait_for_completion(&sbi
->s_kobj_unregister
);
1105 if (sbi
->s_chksum_driver
)
1106 crypto_free_shash(sbi
->s_chksum_driver
);
1107 kfree(sbi
->s_blockgroup_lock
);
1108 fs_put_dax(sbi
->s_daxdev
);
1109 fscrypt_free_dummy_context(&sbi
->s_dummy_enc_ctx
);
1110 #ifdef CONFIG_UNICODE
1111 utf8_unload(sbi
->s_encoding
);
1116 static struct kmem_cache
*ext4_inode_cachep
;
1119 * Called inside transaction, so use GFP_NOFS
1121 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
1123 struct ext4_inode_info
*ei
;
1125 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
1129 inode_set_iversion(&ei
->vfs_inode
, 1);
1130 spin_lock_init(&ei
->i_raw_lock
);
1131 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
1132 spin_lock_init(&ei
->i_prealloc_lock
);
1133 ext4_es_init_tree(&ei
->i_es_tree
);
1134 rwlock_init(&ei
->i_es_lock
);
1135 INIT_LIST_HEAD(&ei
->i_es_list
);
1136 ei
->i_es_all_nr
= 0;
1137 ei
->i_es_shk_nr
= 0;
1138 ei
->i_es_shrink_lblk
= 0;
1139 ei
->i_reserved_data_blocks
= 0;
1140 spin_lock_init(&(ei
->i_block_reservation_lock
));
1141 ext4_init_pending_tree(&ei
->i_pending_tree
);
1143 ei
->i_reserved_quota
= 0;
1144 memset(&ei
->i_dquot
, 0, sizeof(ei
->i_dquot
));
1147 INIT_LIST_HEAD(&ei
->i_rsv_conversion_list
);
1148 spin_lock_init(&ei
->i_completed_io_lock
);
1150 ei
->i_datasync_tid
= 0;
1151 atomic_set(&ei
->i_unwritten
, 0);
1152 INIT_WORK(&ei
->i_rsv_conversion_work
, ext4_end_io_rsv_work
);
1153 return &ei
->vfs_inode
;
1156 static int ext4_drop_inode(struct inode
*inode
)
1158 int drop
= generic_drop_inode(inode
);
1161 drop
= fscrypt_drop_inode(inode
);
1163 trace_ext4_drop_inode(inode
, drop
);
1167 static void ext4_free_in_core_inode(struct inode
*inode
)
1169 fscrypt_free_inode(inode
);
1170 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
1173 static void ext4_destroy_inode(struct inode
*inode
)
1175 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
1176 ext4_msg(inode
->i_sb
, KERN_ERR
,
1177 "Inode %lu (%p): orphan list check failed!",
1178 inode
->i_ino
, EXT4_I(inode
));
1179 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
1180 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
1186 static void init_once(void *foo
)
1188 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
1190 INIT_LIST_HEAD(&ei
->i_orphan
);
1191 init_rwsem(&ei
->xattr_sem
);
1192 init_rwsem(&ei
->i_data_sem
);
1193 init_rwsem(&ei
->i_mmap_sem
);
1194 inode_init_once(&ei
->vfs_inode
);
1197 static int __init
init_inodecache(void)
1199 ext4_inode_cachep
= kmem_cache_create_usercopy("ext4_inode_cache",
1200 sizeof(struct ext4_inode_info
), 0,
1201 (SLAB_RECLAIM_ACCOUNT
|SLAB_MEM_SPREAD
|
1203 offsetof(struct ext4_inode_info
, i_data
),
1204 sizeof_field(struct ext4_inode_info
, i_data
),
1206 if (ext4_inode_cachep
== NULL
)
1211 static void destroy_inodecache(void)
1214 * Make sure all delayed rcu free inodes are flushed before we
1218 kmem_cache_destroy(ext4_inode_cachep
);
1221 void ext4_clear_inode(struct inode
*inode
)
1223 invalidate_inode_buffers(inode
);
1225 ext4_discard_preallocations(inode
);
1226 ext4_es_remove_extent(inode
, 0, EXT_MAX_BLOCKS
);
1228 if (EXT4_I(inode
)->jinode
) {
1229 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode
),
1230 EXT4_I(inode
)->jinode
);
1231 jbd2_free_inode(EXT4_I(inode
)->jinode
);
1232 EXT4_I(inode
)->jinode
= NULL
;
1234 fscrypt_put_encryption_info(inode
);
1235 fsverity_cleanup_inode(inode
);
1238 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
1239 u64 ino
, u32 generation
)
1241 struct inode
*inode
;
1244 * Currently we don't know the generation for parent directory, so
1245 * a generation of 0 means "accept any"
1247 inode
= ext4_iget(sb
, ino
, EXT4_IGET_HANDLE
);
1249 return ERR_CAST(inode
);
1250 if (generation
&& inode
->i_generation
!= generation
) {
1252 return ERR_PTR(-ESTALE
);
1258 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
1259 int fh_len
, int fh_type
)
1261 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
1262 ext4_nfs_get_inode
);
1265 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
1266 int fh_len
, int fh_type
)
1268 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
1269 ext4_nfs_get_inode
);
1272 static int ext4_nfs_commit_metadata(struct inode
*inode
)
1274 struct writeback_control wbc
= {
1275 .sync_mode
= WB_SYNC_ALL
1278 trace_ext4_nfs_commit_metadata(inode
);
1279 return ext4_write_inode(inode
, &wbc
);
1283 * Try to release metadata pages (indirect blocks, directories) which are
1284 * mapped via the block device. Since these pages could have journal heads
1285 * which would prevent try_to_free_buffers() from freeing them, we must use
1286 * jbd2 layer's try_to_free_buffers() function to release them.
1288 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
1291 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
1293 WARN_ON(PageChecked(page
));
1294 if (!page_has_buffers(page
))
1297 return jbd2_journal_try_to_free_buffers(journal
, page
,
1298 wait
& ~__GFP_DIRECT_RECLAIM
);
1299 return try_to_free_buffers(page
);
1302 #ifdef CONFIG_FS_ENCRYPTION
1303 static int ext4_get_context(struct inode
*inode
, void *ctx
, size_t len
)
1305 return ext4_xattr_get(inode
, EXT4_XATTR_INDEX_ENCRYPTION
,
1306 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT
, ctx
, len
);
1309 static int ext4_set_context(struct inode
*inode
, const void *ctx
, size_t len
,
1312 handle_t
*handle
= fs_data
;
1313 int res
, res2
, credits
, retries
= 0;
1316 * Encrypting the root directory is not allowed because e2fsck expects
1317 * lost+found to exist and be unencrypted, and encrypting the root
1318 * directory would imply encrypting the lost+found directory as well as
1319 * the filename "lost+found" itself.
1321 if (inode
->i_ino
== EXT4_ROOT_INO
)
1324 if (WARN_ON_ONCE(IS_DAX(inode
) && i_size_read(inode
)))
1327 res
= ext4_convert_inline_data(inode
);
1332 * If a journal handle was specified, then the encryption context is
1333 * being set on a new inode via inheritance and is part of a larger
1334 * transaction to create the inode. Otherwise the encryption context is
1335 * being set on an existing inode in its own transaction. Only in the
1336 * latter case should the "retry on ENOSPC" logic be used.
1340 res
= ext4_xattr_set_handle(handle
, inode
,
1341 EXT4_XATTR_INDEX_ENCRYPTION
,
1342 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT
,
1345 ext4_set_inode_flag(inode
, EXT4_INODE_ENCRYPT
);
1346 ext4_clear_inode_state(inode
,
1347 EXT4_STATE_MAY_INLINE_DATA
);
1349 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1350 * S_DAX may be disabled
1352 ext4_set_inode_flags(inode
);
1357 res
= dquot_initialize(inode
);
1361 res
= ext4_xattr_set_credits(inode
, len
, false /* is_create */,
1366 handle
= ext4_journal_start(inode
, EXT4_HT_MISC
, credits
);
1368 return PTR_ERR(handle
);
1370 res
= ext4_xattr_set_handle(handle
, inode
, EXT4_XATTR_INDEX_ENCRYPTION
,
1371 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT
,
1374 ext4_set_inode_flag(inode
, EXT4_INODE_ENCRYPT
);
1376 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1377 * S_DAX may be disabled
1379 ext4_set_inode_flags(inode
);
1380 res
= ext4_mark_inode_dirty(handle
, inode
);
1382 EXT4_ERROR_INODE(inode
, "Failed to mark inode dirty");
1384 res2
= ext4_journal_stop(handle
);
1386 if (res
== -ENOSPC
&& ext4_should_retry_alloc(inode
->i_sb
, &retries
))
1393 static const union fscrypt_context
*
1394 ext4_get_dummy_context(struct super_block
*sb
)
1396 return EXT4_SB(sb
)->s_dummy_enc_ctx
.ctx
;
1399 static bool ext4_has_stable_inodes(struct super_block
*sb
)
1401 return ext4_has_feature_stable_inodes(sb
);
1404 static void ext4_get_ino_and_lblk_bits(struct super_block
*sb
,
1405 int *ino_bits_ret
, int *lblk_bits_ret
)
1407 *ino_bits_ret
= 8 * sizeof(EXT4_SB(sb
)->s_es
->s_inodes_count
);
1408 *lblk_bits_ret
= 8 * sizeof(ext4_lblk_t
);
1411 static const struct fscrypt_operations ext4_cryptops
= {
1412 .key_prefix
= "ext4:",
1413 .get_context
= ext4_get_context
,
1414 .set_context
= ext4_set_context
,
1415 .get_dummy_context
= ext4_get_dummy_context
,
1416 .empty_dir
= ext4_empty_dir
,
1417 .max_namelen
= EXT4_NAME_LEN
,
1418 .has_stable_inodes
= ext4_has_stable_inodes
,
1419 .get_ino_and_lblk_bits
= ext4_get_ino_and_lblk_bits
,
1424 static const char * const quotatypes
[] = INITQFNAMES
;
1425 #define QTYPE2NAME(t) (quotatypes[t])
1427 static int ext4_write_dquot(struct dquot
*dquot
);
1428 static int ext4_acquire_dquot(struct dquot
*dquot
);
1429 static int ext4_release_dquot(struct dquot
*dquot
);
1430 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1431 static int ext4_write_info(struct super_block
*sb
, int type
);
1432 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1433 const struct path
*path
);
1434 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1435 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1436 size_t len
, loff_t off
);
1437 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1438 const char *data
, size_t len
, loff_t off
);
1439 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
1440 unsigned int flags
);
1441 static int ext4_enable_quotas(struct super_block
*sb
);
1443 static struct dquot
**ext4_get_dquots(struct inode
*inode
)
1445 return EXT4_I(inode
)->i_dquot
;
1448 static const struct dquot_operations ext4_quota_operations
= {
1449 .get_reserved_space
= ext4_get_reserved_space
,
1450 .write_dquot
= ext4_write_dquot
,
1451 .acquire_dquot
= ext4_acquire_dquot
,
1452 .release_dquot
= ext4_release_dquot
,
1453 .mark_dirty
= ext4_mark_dquot_dirty
,
1454 .write_info
= ext4_write_info
,
1455 .alloc_dquot
= dquot_alloc
,
1456 .destroy_dquot
= dquot_destroy
,
1457 .get_projid
= ext4_get_projid
,
1458 .get_inode_usage
= ext4_get_inode_usage
,
1459 .get_next_id
= dquot_get_next_id
,
1462 static const struct quotactl_ops ext4_qctl_operations
= {
1463 .quota_on
= ext4_quota_on
,
1464 .quota_off
= ext4_quota_off
,
1465 .quota_sync
= dquot_quota_sync
,
1466 .get_state
= dquot_get_state
,
1467 .set_info
= dquot_set_dqinfo
,
1468 .get_dqblk
= dquot_get_dqblk
,
1469 .set_dqblk
= dquot_set_dqblk
,
1470 .get_nextdqblk
= dquot_get_next_dqblk
,
1474 static const struct super_operations ext4_sops
= {
1475 .alloc_inode
= ext4_alloc_inode
,
1476 .free_inode
= ext4_free_in_core_inode
,
1477 .destroy_inode
= ext4_destroy_inode
,
1478 .write_inode
= ext4_write_inode
,
1479 .dirty_inode
= ext4_dirty_inode
,
1480 .drop_inode
= ext4_drop_inode
,
1481 .evict_inode
= ext4_evict_inode
,
1482 .put_super
= ext4_put_super
,
1483 .sync_fs
= ext4_sync_fs
,
1484 .freeze_fs
= ext4_freeze
,
1485 .unfreeze_fs
= ext4_unfreeze
,
1486 .statfs
= ext4_statfs
,
1487 .remount_fs
= ext4_remount
,
1488 .show_options
= ext4_show_options
,
1490 .quota_read
= ext4_quota_read
,
1491 .quota_write
= ext4_quota_write
,
1492 .get_dquots
= ext4_get_dquots
,
1494 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1497 static const struct export_operations ext4_export_ops
= {
1498 .fh_to_dentry
= ext4_fh_to_dentry
,
1499 .fh_to_parent
= ext4_fh_to_parent
,
1500 .get_parent
= ext4_get_parent
,
1501 .commit_metadata
= ext4_nfs_commit_metadata
,
1505 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1506 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1507 Opt_nouid32
, Opt_debug
, Opt_removed
,
1508 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1509 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
,
1510 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
, Opt_journal_dev
,
1511 Opt_journal_path
, Opt_journal_checksum
, Opt_journal_async_commit
,
1512 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1513 Opt_data_err_abort
, Opt_data_err_ignore
, Opt_test_dummy_encryption
,
1514 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1515 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1516 Opt_noquota
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1517 Opt_usrquota
, Opt_grpquota
, Opt_prjquota
, Opt_i_version
, Opt_dax
,
1518 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
, Opt_warn_on_error
,
1519 Opt_nowarn_on_error
, Opt_mblk_io_submit
,
1520 Opt_lazytime
, Opt_nolazytime
, Opt_debug_want_extra_isize
,
1521 Opt_nomblk_io_submit
, Opt_block_validity
, Opt_noblock_validity
,
1522 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1523 Opt_dioread_nolock
, Opt_dioread_lock
,
1524 Opt_discard
, Opt_nodiscard
, Opt_init_itable
, Opt_noinit_itable
,
1525 Opt_max_dir_size_kb
, Opt_nojournal_checksum
, Opt_nombcache
,
1528 static const match_table_t tokens
= {
1529 {Opt_bsd_df
, "bsddf"},
1530 {Opt_minix_df
, "minixdf"},
1531 {Opt_grpid
, "grpid"},
1532 {Opt_grpid
, "bsdgroups"},
1533 {Opt_nogrpid
, "nogrpid"},
1534 {Opt_nogrpid
, "sysvgroups"},
1535 {Opt_resgid
, "resgid=%u"},
1536 {Opt_resuid
, "resuid=%u"},
1538 {Opt_err_cont
, "errors=continue"},
1539 {Opt_err_panic
, "errors=panic"},
1540 {Opt_err_ro
, "errors=remount-ro"},
1541 {Opt_nouid32
, "nouid32"},
1542 {Opt_debug
, "debug"},
1543 {Opt_removed
, "oldalloc"},
1544 {Opt_removed
, "orlov"},
1545 {Opt_user_xattr
, "user_xattr"},
1546 {Opt_nouser_xattr
, "nouser_xattr"},
1548 {Opt_noacl
, "noacl"},
1549 {Opt_noload
, "norecovery"},
1550 {Opt_noload
, "noload"},
1551 {Opt_removed
, "nobh"},
1552 {Opt_removed
, "bh"},
1553 {Opt_commit
, "commit=%u"},
1554 {Opt_min_batch_time
, "min_batch_time=%u"},
1555 {Opt_max_batch_time
, "max_batch_time=%u"},
1556 {Opt_journal_dev
, "journal_dev=%u"},
1557 {Opt_journal_path
, "journal_path=%s"},
1558 {Opt_journal_checksum
, "journal_checksum"},
1559 {Opt_nojournal_checksum
, "nojournal_checksum"},
1560 {Opt_journal_async_commit
, "journal_async_commit"},
1561 {Opt_abort
, "abort"},
1562 {Opt_data_journal
, "data=journal"},
1563 {Opt_data_ordered
, "data=ordered"},
1564 {Opt_data_writeback
, "data=writeback"},
1565 {Opt_data_err_abort
, "data_err=abort"},
1566 {Opt_data_err_ignore
, "data_err=ignore"},
1567 {Opt_offusrjquota
, "usrjquota="},
1568 {Opt_usrjquota
, "usrjquota=%s"},
1569 {Opt_offgrpjquota
, "grpjquota="},
1570 {Opt_grpjquota
, "grpjquota=%s"},
1571 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1572 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1573 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1574 {Opt_grpquota
, "grpquota"},
1575 {Opt_noquota
, "noquota"},
1576 {Opt_quota
, "quota"},
1577 {Opt_usrquota
, "usrquota"},
1578 {Opt_prjquota
, "prjquota"},
1579 {Opt_barrier
, "barrier=%u"},
1580 {Opt_barrier
, "barrier"},
1581 {Opt_nobarrier
, "nobarrier"},
1582 {Opt_i_version
, "i_version"},
1584 {Opt_stripe
, "stripe=%u"},
1585 {Opt_delalloc
, "delalloc"},
1586 {Opt_warn_on_error
, "warn_on_error"},
1587 {Opt_nowarn_on_error
, "nowarn_on_error"},
1588 {Opt_lazytime
, "lazytime"},
1589 {Opt_nolazytime
, "nolazytime"},
1590 {Opt_debug_want_extra_isize
, "debug_want_extra_isize=%u"},
1591 {Opt_nodelalloc
, "nodelalloc"},
1592 {Opt_removed
, "mblk_io_submit"},
1593 {Opt_removed
, "nomblk_io_submit"},
1594 {Opt_block_validity
, "block_validity"},
1595 {Opt_noblock_validity
, "noblock_validity"},
1596 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1597 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1598 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1599 {Opt_auto_da_alloc
, "auto_da_alloc"},
1600 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1601 {Opt_dioread_nolock
, "dioread_nolock"},
1602 {Opt_dioread_lock
, "nodioread_nolock"},
1603 {Opt_dioread_lock
, "dioread_lock"},
1604 {Opt_discard
, "discard"},
1605 {Opt_nodiscard
, "nodiscard"},
1606 {Opt_init_itable
, "init_itable=%u"},
1607 {Opt_init_itable
, "init_itable"},
1608 {Opt_noinit_itable
, "noinit_itable"},
1609 {Opt_max_dir_size_kb
, "max_dir_size_kb=%u"},
1610 {Opt_test_dummy_encryption
, "test_dummy_encryption=%s"},
1611 {Opt_test_dummy_encryption
, "test_dummy_encryption"},
1612 {Opt_nombcache
, "nombcache"},
1613 {Opt_nombcache
, "no_mbcache"}, /* for backward compatibility */
1614 {Opt_removed
, "check=none"}, /* mount option from ext2/3 */
1615 {Opt_removed
, "nocheck"}, /* mount option from ext2/3 */
1616 {Opt_removed
, "reservation"}, /* mount option from ext2/3 */
1617 {Opt_removed
, "noreservation"}, /* mount option from ext2/3 */
1618 {Opt_removed
, "journal=%u"}, /* mount option from ext2/3 */
1622 static ext4_fsblk_t
get_sb_block(void **data
)
1624 ext4_fsblk_t sb_block
;
1625 char *options
= (char *) *data
;
1627 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1628 return 1; /* Default location */
1631 /* TODO: use simple_strtoll with >32bit ext4 */
1632 sb_block
= simple_strtoul(options
, &options
, 0);
1633 if (*options
&& *options
!= ',') {
1634 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1638 if (*options
== ',')
1640 *data
= (void *) options
;
1645 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1646 static const char deprecated_msg
[] =
1647 "Mount option \"%s\" will be removed by %s\n"
1648 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1651 static int set_qf_name(struct super_block
*sb
, int qtype
, substring_t
*args
)
1653 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1654 char *qname
, *old_qname
= get_qf_name(sb
, sbi
, qtype
);
1657 if (sb_any_quota_loaded(sb
) && !old_qname
) {
1658 ext4_msg(sb
, KERN_ERR
,
1659 "Cannot change journaled "
1660 "quota options when quota turned on");
1663 if (ext4_has_feature_quota(sb
)) {
1664 ext4_msg(sb
, KERN_INFO
, "Journaled quota options "
1665 "ignored when QUOTA feature is enabled");
1668 qname
= match_strdup(args
);
1670 ext4_msg(sb
, KERN_ERR
,
1671 "Not enough memory for storing quotafile name");
1675 if (strcmp(old_qname
, qname
) == 0)
1678 ext4_msg(sb
, KERN_ERR
,
1679 "%s quota file already specified",
1683 if (strchr(qname
, '/')) {
1684 ext4_msg(sb
, KERN_ERR
,
1685 "quotafile must be on filesystem root");
1688 rcu_assign_pointer(sbi
->s_qf_names
[qtype
], qname
);
1696 static int clear_qf_name(struct super_block
*sb
, int qtype
)
1699 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1700 char *old_qname
= get_qf_name(sb
, sbi
, qtype
);
1702 if (sb_any_quota_loaded(sb
) && old_qname
) {
1703 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled quota options"
1704 " when quota turned on");
1707 rcu_assign_pointer(sbi
->s_qf_names
[qtype
], NULL
);
1714 #define MOPT_SET 0x0001
1715 #define MOPT_CLEAR 0x0002
1716 #define MOPT_NOSUPPORT 0x0004
1717 #define MOPT_EXPLICIT 0x0008
1718 #define MOPT_CLEAR_ERR 0x0010
1719 #define MOPT_GTE0 0x0020
1722 #define MOPT_QFMT 0x0040
1724 #define MOPT_Q MOPT_NOSUPPORT
1725 #define MOPT_QFMT MOPT_NOSUPPORT
1727 #define MOPT_DATAJ 0x0080
1728 #define MOPT_NO_EXT2 0x0100
1729 #define MOPT_NO_EXT3 0x0200
1730 #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1731 #define MOPT_STRING 0x0400
1733 static const struct mount_opts
{
1737 } ext4_mount_opts
[] = {
1738 {Opt_minix_df
, EXT4_MOUNT_MINIX_DF
, MOPT_SET
},
1739 {Opt_bsd_df
, EXT4_MOUNT_MINIX_DF
, MOPT_CLEAR
},
1740 {Opt_grpid
, EXT4_MOUNT_GRPID
, MOPT_SET
},
1741 {Opt_nogrpid
, EXT4_MOUNT_GRPID
, MOPT_CLEAR
},
1742 {Opt_block_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_SET
},
1743 {Opt_noblock_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_CLEAR
},
1744 {Opt_dioread_nolock
, EXT4_MOUNT_DIOREAD_NOLOCK
,
1745 MOPT_EXT4_ONLY
| MOPT_SET
},
1746 {Opt_dioread_lock
, EXT4_MOUNT_DIOREAD_NOLOCK
,
1747 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1748 {Opt_discard
, EXT4_MOUNT_DISCARD
, MOPT_SET
},
1749 {Opt_nodiscard
, EXT4_MOUNT_DISCARD
, MOPT_CLEAR
},
1750 {Opt_delalloc
, EXT4_MOUNT_DELALLOC
,
1751 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1752 {Opt_nodelalloc
, EXT4_MOUNT_DELALLOC
,
1753 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1754 {Opt_warn_on_error
, EXT4_MOUNT_WARN_ON_ERROR
, MOPT_SET
},
1755 {Opt_nowarn_on_error
, EXT4_MOUNT_WARN_ON_ERROR
, MOPT_CLEAR
},
1756 {Opt_nojournal_checksum
, EXT4_MOUNT_JOURNAL_CHECKSUM
,
1757 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1758 {Opt_journal_checksum
, EXT4_MOUNT_JOURNAL_CHECKSUM
,
1759 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1760 {Opt_journal_async_commit
, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT
|
1761 EXT4_MOUNT_JOURNAL_CHECKSUM
),
1762 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1763 {Opt_noload
, EXT4_MOUNT_NOLOAD
, MOPT_NO_EXT2
| MOPT_SET
},
1764 {Opt_err_panic
, EXT4_MOUNT_ERRORS_PANIC
, MOPT_SET
| MOPT_CLEAR_ERR
},
1765 {Opt_err_ro
, EXT4_MOUNT_ERRORS_RO
, MOPT_SET
| MOPT_CLEAR_ERR
},
1766 {Opt_err_cont
, EXT4_MOUNT_ERRORS_CONT
, MOPT_SET
| MOPT_CLEAR_ERR
},
1767 {Opt_data_err_abort
, EXT4_MOUNT_DATA_ERR_ABORT
,
1769 {Opt_data_err_ignore
, EXT4_MOUNT_DATA_ERR_ABORT
,
1771 {Opt_barrier
, EXT4_MOUNT_BARRIER
, MOPT_SET
},
1772 {Opt_nobarrier
, EXT4_MOUNT_BARRIER
, MOPT_CLEAR
},
1773 {Opt_noauto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_SET
},
1774 {Opt_auto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_CLEAR
},
1775 {Opt_noinit_itable
, EXT4_MOUNT_INIT_INODE_TABLE
, MOPT_CLEAR
},
1776 {Opt_commit
, 0, MOPT_GTE0
},
1777 {Opt_max_batch_time
, 0, MOPT_GTE0
},
1778 {Opt_min_batch_time
, 0, MOPT_GTE0
},
1779 {Opt_inode_readahead_blks
, 0, MOPT_GTE0
},
1780 {Opt_init_itable
, 0, MOPT_GTE0
},
1781 {Opt_dax
, EXT4_MOUNT_DAX
, MOPT_SET
},
1782 {Opt_stripe
, 0, MOPT_GTE0
},
1783 {Opt_resuid
, 0, MOPT_GTE0
},
1784 {Opt_resgid
, 0, MOPT_GTE0
},
1785 {Opt_journal_dev
, 0, MOPT_NO_EXT2
| MOPT_GTE0
},
1786 {Opt_journal_path
, 0, MOPT_NO_EXT2
| MOPT_STRING
},
1787 {Opt_journal_ioprio
, 0, MOPT_NO_EXT2
| MOPT_GTE0
},
1788 {Opt_data_journal
, EXT4_MOUNT_JOURNAL_DATA
, MOPT_NO_EXT2
| MOPT_DATAJ
},
1789 {Opt_data_ordered
, EXT4_MOUNT_ORDERED_DATA
, MOPT_NO_EXT2
| MOPT_DATAJ
},
1790 {Opt_data_writeback
, EXT4_MOUNT_WRITEBACK_DATA
,
1791 MOPT_NO_EXT2
| MOPT_DATAJ
},
1792 {Opt_user_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_SET
},
1793 {Opt_nouser_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_CLEAR
},
1794 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1795 {Opt_acl
, EXT4_MOUNT_POSIX_ACL
, MOPT_SET
},
1796 {Opt_noacl
, EXT4_MOUNT_POSIX_ACL
, MOPT_CLEAR
},
1798 {Opt_acl
, 0, MOPT_NOSUPPORT
},
1799 {Opt_noacl
, 0, MOPT_NOSUPPORT
},
1801 {Opt_nouid32
, EXT4_MOUNT_NO_UID32
, MOPT_SET
},
1802 {Opt_debug
, EXT4_MOUNT_DEBUG
, MOPT_SET
},
1803 {Opt_debug_want_extra_isize
, 0, MOPT_GTE0
},
1804 {Opt_quota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
, MOPT_SET
| MOPT_Q
},
1805 {Opt_usrquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
,
1807 {Opt_grpquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_GRPQUOTA
,
1809 {Opt_prjquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_PRJQUOTA
,
1811 {Opt_noquota
, (EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
|
1812 EXT4_MOUNT_GRPQUOTA
| EXT4_MOUNT_PRJQUOTA
),
1813 MOPT_CLEAR
| MOPT_Q
},
1814 {Opt_usrjquota
, 0, MOPT_Q
},
1815 {Opt_grpjquota
, 0, MOPT_Q
},
1816 {Opt_offusrjquota
, 0, MOPT_Q
},
1817 {Opt_offgrpjquota
, 0, MOPT_Q
},
1818 {Opt_jqfmt_vfsold
, QFMT_VFS_OLD
, MOPT_QFMT
},
1819 {Opt_jqfmt_vfsv0
, QFMT_VFS_V0
, MOPT_QFMT
},
1820 {Opt_jqfmt_vfsv1
, QFMT_VFS_V1
, MOPT_QFMT
},
1821 {Opt_max_dir_size_kb
, 0, MOPT_GTE0
},
1822 {Opt_test_dummy_encryption
, 0, MOPT_STRING
},
1823 {Opt_nombcache
, EXT4_MOUNT_NO_MBCACHE
, MOPT_SET
},
1827 #ifdef CONFIG_UNICODE
1828 static const struct ext4_sb_encodings
{
1832 } ext4_sb_encoding_map
[] = {
1833 {EXT4_ENC_UTF8_12_1
, "utf8", "12.1.0"},
1836 static int ext4_sb_read_encoding(const struct ext4_super_block
*es
,
1837 const struct ext4_sb_encodings
**encoding
,
1840 __u16 magic
= le16_to_cpu(es
->s_encoding
);
1843 for (i
= 0; i
< ARRAY_SIZE(ext4_sb_encoding_map
); i
++)
1844 if (magic
== ext4_sb_encoding_map
[i
].magic
)
1847 if (i
>= ARRAY_SIZE(ext4_sb_encoding_map
))
1850 *encoding
= &ext4_sb_encoding_map
[i
];
1851 *flags
= le16_to_cpu(es
->s_encoding_flags
);
1857 static int ext4_set_test_dummy_encryption(struct super_block
*sb
,
1859 const substring_t
*arg
,
1862 #ifdef CONFIG_FS_ENCRYPTION
1863 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1867 * This mount option is just for testing, and it's not worthwhile to
1868 * implement the extra complexity (e.g. RCU protection) that would be
1869 * needed to allow it to be set or changed during remount. We do allow
1870 * it to be specified during remount, but only if there is no change.
1872 if (is_remount
&& !sbi
->s_dummy_enc_ctx
.ctx
) {
1873 ext4_msg(sb
, KERN_WARNING
,
1874 "Can't set test_dummy_encryption on remount");
1877 err
= fscrypt_set_test_dummy_encryption(sb
, arg
, &sbi
->s_dummy_enc_ctx
);
1880 ext4_msg(sb
, KERN_WARNING
,
1881 "Can't change test_dummy_encryption on remount");
1882 else if (err
== -EINVAL
)
1883 ext4_msg(sb
, KERN_WARNING
,
1884 "Value of option \"%s\" is unrecognized", opt
);
1886 ext4_msg(sb
, KERN_WARNING
,
1887 "Error processing option \"%s\" [%d]",
1891 ext4_msg(sb
, KERN_WARNING
, "Test dummy encryption mode enabled");
1893 ext4_msg(sb
, KERN_WARNING
,
1894 "Test dummy encryption mount option ignored");
1899 static int handle_mount_opt(struct super_block
*sb
, char *opt
, int token
,
1900 substring_t
*args
, unsigned long *journal_devnum
,
1901 unsigned int *journal_ioprio
, int is_remount
)
1903 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1904 const struct mount_opts
*m
;
1910 if (token
== Opt_usrjquota
)
1911 return set_qf_name(sb
, USRQUOTA
, &args
[0]);
1912 else if (token
== Opt_grpjquota
)
1913 return set_qf_name(sb
, GRPQUOTA
, &args
[0]);
1914 else if (token
== Opt_offusrjquota
)
1915 return clear_qf_name(sb
, USRQUOTA
);
1916 else if (token
== Opt_offgrpjquota
)
1917 return clear_qf_name(sb
, GRPQUOTA
);
1921 case Opt_nouser_xattr
:
1922 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, opt
, "3.5");
1925 return 1; /* handled by get_sb_block() */
1927 ext4_msg(sb
, KERN_WARNING
, "Ignoring removed %s option", opt
);
1930 sbi
->s_mount_flags
|= EXT4_MF_FS_ABORTED
;
1933 sb
->s_flags
|= SB_I_VERSION
;
1936 sb
->s_flags
|= SB_LAZYTIME
;
1938 case Opt_nolazytime
:
1939 sb
->s_flags
&= ~SB_LAZYTIME
;
1943 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++)
1944 if (token
== m
->token
)
1947 if (m
->token
== Opt_err
) {
1948 ext4_msg(sb
, KERN_ERR
, "Unrecognized mount option \"%s\" "
1949 "or missing value", opt
);
1953 if ((m
->flags
& MOPT_NO_EXT2
) && IS_EXT2_SB(sb
)) {
1954 ext4_msg(sb
, KERN_ERR
,
1955 "Mount option \"%s\" incompatible with ext2", opt
);
1958 if ((m
->flags
& MOPT_NO_EXT3
) && IS_EXT3_SB(sb
)) {
1959 ext4_msg(sb
, KERN_ERR
,
1960 "Mount option \"%s\" incompatible with ext3", opt
);
1964 if (args
->from
&& !(m
->flags
& MOPT_STRING
) && match_int(args
, &arg
))
1966 if (args
->from
&& (m
->flags
& MOPT_GTE0
) && (arg
< 0))
1968 if (m
->flags
& MOPT_EXPLICIT
) {
1969 if (m
->mount_opt
& EXT4_MOUNT_DELALLOC
) {
1970 set_opt2(sb
, EXPLICIT_DELALLOC
);
1971 } else if (m
->mount_opt
& EXT4_MOUNT_JOURNAL_CHECKSUM
) {
1972 set_opt2(sb
, EXPLICIT_JOURNAL_CHECKSUM
);
1976 if (m
->flags
& MOPT_CLEAR_ERR
)
1977 clear_opt(sb
, ERRORS_MASK
);
1978 if (token
== Opt_noquota
&& sb_any_quota_loaded(sb
)) {
1979 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
1980 "options when quota turned on");
1984 if (m
->flags
& MOPT_NOSUPPORT
) {
1985 ext4_msg(sb
, KERN_ERR
, "%s option not supported", opt
);
1986 } else if (token
== Opt_commit
) {
1988 arg
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
1989 else if (arg
> INT_MAX
/ HZ
) {
1990 ext4_msg(sb
, KERN_ERR
,
1991 "Invalid commit interval %d, "
1992 "must be smaller than %d",
1996 sbi
->s_commit_interval
= HZ
* arg
;
1997 } else if (token
== Opt_debug_want_extra_isize
) {
2000 (arg
> (sbi
->s_inode_size
- EXT4_GOOD_OLD_INODE_SIZE
))) {
2001 ext4_msg(sb
, KERN_ERR
,
2002 "Invalid want_extra_isize %d", arg
);
2005 sbi
->s_want_extra_isize
= arg
;
2006 } else if (token
== Opt_max_batch_time
) {
2007 sbi
->s_max_batch_time
= arg
;
2008 } else if (token
== Opt_min_batch_time
) {
2009 sbi
->s_min_batch_time
= arg
;
2010 } else if (token
== Opt_inode_readahead_blks
) {
2011 if (arg
&& (arg
> (1 << 30) || !is_power_of_2(arg
))) {
2012 ext4_msg(sb
, KERN_ERR
,
2013 "EXT4-fs: inode_readahead_blks must be "
2014 "0 or a power of 2 smaller than 2^31");
2017 sbi
->s_inode_readahead_blks
= arg
;
2018 } else if (token
== Opt_init_itable
) {
2019 set_opt(sb
, INIT_INODE_TABLE
);
2021 arg
= EXT4_DEF_LI_WAIT_MULT
;
2022 sbi
->s_li_wait_mult
= arg
;
2023 } else if (token
== Opt_max_dir_size_kb
) {
2024 sbi
->s_max_dir_size_kb
= arg
;
2025 } else if (token
== Opt_stripe
) {
2026 sbi
->s_stripe
= arg
;
2027 } else if (token
== Opt_resuid
) {
2028 uid
= make_kuid(current_user_ns(), arg
);
2029 if (!uid_valid(uid
)) {
2030 ext4_msg(sb
, KERN_ERR
, "Invalid uid value %d", arg
);
2033 sbi
->s_resuid
= uid
;
2034 } else if (token
== Opt_resgid
) {
2035 gid
= make_kgid(current_user_ns(), arg
);
2036 if (!gid_valid(gid
)) {
2037 ext4_msg(sb
, KERN_ERR
, "Invalid gid value %d", arg
);
2040 sbi
->s_resgid
= gid
;
2041 } else if (token
== Opt_journal_dev
) {
2043 ext4_msg(sb
, KERN_ERR
,
2044 "Cannot specify journal on remount");
2047 *journal_devnum
= arg
;
2048 } else if (token
== Opt_journal_path
) {
2050 struct inode
*journal_inode
;
2055 ext4_msg(sb
, KERN_ERR
,
2056 "Cannot specify journal on remount");
2059 journal_path
= match_strdup(&args
[0]);
2060 if (!journal_path
) {
2061 ext4_msg(sb
, KERN_ERR
, "error: could not dup "
2062 "journal device string");
2066 error
= kern_path(journal_path
, LOOKUP_FOLLOW
, &path
);
2068 ext4_msg(sb
, KERN_ERR
, "error: could not find "
2069 "journal device path: error %d", error
);
2070 kfree(journal_path
);
2074 journal_inode
= d_inode(path
.dentry
);
2075 if (!S_ISBLK(journal_inode
->i_mode
)) {
2076 ext4_msg(sb
, KERN_ERR
, "error: journal path %s "
2077 "is not a block device", journal_path
);
2079 kfree(journal_path
);
2083 *journal_devnum
= new_encode_dev(journal_inode
->i_rdev
);
2085 kfree(journal_path
);
2086 } else if (token
== Opt_journal_ioprio
) {
2088 ext4_msg(sb
, KERN_ERR
, "Invalid journal IO priority"
2093 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
, arg
);
2094 } else if (token
== Opt_test_dummy_encryption
) {
2095 return ext4_set_test_dummy_encryption(sb
, opt
, &args
[0],
2097 } else if (m
->flags
& MOPT_DATAJ
) {
2099 if (!sbi
->s_journal
)
2100 ext4_msg(sb
, KERN_WARNING
, "Remounting file system with no journal so ignoring journalled data option");
2101 else if (test_opt(sb
, DATA_FLAGS
) != m
->mount_opt
) {
2102 ext4_msg(sb
, KERN_ERR
,
2103 "Cannot change data mode on remount");
2107 clear_opt(sb
, DATA_FLAGS
);
2108 sbi
->s_mount_opt
|= m
->mount_opt
;
2111 } else if (m
->flags
& MOPT_QFMT
) {
2112 if (sb_any_quota_loaded(sb
) &&
2113 sbi
->s_jquota_fmt
!= m
->mount_opt
) {
2114 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled "
2115 "quota options when quota turned on");
2118 if (ext4_has_feature_quota(sb
)) {
2119 ext4_msg(sb
, KERN_INFO
,
2120 "Quota format mount options ignored "
2121 "when QUOTA feature is enabled");
2124 sbi
->s_jquota_fmt
= m
->mount_opt
;
2126 } else if (token
== Opt_dax
) {
2127 #ifdef CONFIG_FS_DAX
2128 ext4_msg(sb
, KERN_WARNING
,
2129 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
2130 sbi
->s_mount_opt
|= m
->mount_opt
;
2132 ext4_msg(sb
, KERN_INFO
, "dax option not supported");
2135 } else if (token
== Opt_data_err_abort
) {
2136 sbi
->s_mount_opt
|= m
->mount_opt
;
2137 } else if (token
== Opt_data_err_ignore
) {
2138 sbi
->s_mount_opt
&= ~m
->mount_opt
;
2142 if (m
->flags
& MOPT_CLEAR
)
2144 else if (unlikely(!(m
->flags
& MOPT_SET
))) {
2145 ext4_msg(sb
, KERN_WARNING
,
2146 "buggy handling of option %s", opt
);
2151 sbi
->s_mount_opt
|= m
->mount_opt
;
2153 sbi
->s_mount_opt
&= ~m
->mount_opt
;
2158 static int parse_options(char *options
, struct super_block
*sb
,
2159 unsigned long *journal_devnum
,
2160 unsigned int *journal_ioprio
,
2163 struct ext4_sb_info __maybe_unused
*sbi
= EXT4_SB(sb
);
2164 char *p
, __maybe_unused
*usr_qf_name
, __maybe_unused
*grp_qf_name
;
2165 substring_t args
[MAX_OPT_ARGS
];
2171 while ((p
= strsep(&options
, ",")) != NULL
) {
2175 * Initialize args struct so we know whether arg was
2176 * found; some options take optional arguments.
2178 args
[0].to
= args
[0].from
= NULL
;
2179 token
= match_token(p
, tokens
, args
);
2180 if (handle_mount_opt(sb
, p
, token
, args
, journal_devnum
,
2181 journal_ioprio
, is_remount
) < 0)
2186 * We do the test below only for project quotas. 'usrquota' and
2187 * 'grpquota' mount options are allowed even without quota feature
2188 * to support legacy quotas in quota files.
2190 if (test_opt(sb
, PRJQUOTA
) && !ext4_has_feature_project(sb
)) {
2191 ext4_msg(sb
, KERN_ERR
, "Project quota feature not enabled. "
2192 "Cannot enable project quota enforcement.");
2195 usr_qf_name
= get_qf_name(sb
, sbi
, USRQUOTA
);
2196 grp_qf_name
= get_qf_name(sb
, sbi
, GRPQUOTA
);
2197 if (usr_qf_name
|| grp_qf_name
) {
2198 if (test_opt(sb
, USRQUOTA
) && usr_qf_name
)
2199 clear_opt(sb
, USRQUOTA
);
2201 if (test_opt(sb
, GRPQUOTA
) && grp_qf_name
)
2202 clear_opt(sb
, GRPQUOTA
);
2204 if (test_opt(sb
, GRPQUOTA
) || test_opt(sb
, USRQUOTA
)) {
2205 ext4_msg(sb
, KERN_ERR
, "old and new quota "
2210 if (!sbi
->s_jquota_fmt
) {
2211 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
2217 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
2219 BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
2220 if (blocksize
< PAGE_SIZE
)
2221 ext4_msg(sb
, KERN_WARNING
, "Warning: mounting with an "
2222 "experimental mount option 'dioread_nolock' "
2223 "for blocksize < PAGE_SIZE");
2228 static inline void ext4_show_quota_options(struct seq_file
*seq
,
2229 struct super_block
*sb
)
2231 #if defined(CONFIG_QUOTA)
2232 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2233 char *usr_qf_name
, *grp_qf_name
;
2235 if (sbi
->s_jquota_fmt
) {
2238 switch (sbi
->s_jquota_fmt
) {
2249 seq_printf(seq
, ",jqfmt=%s", fmtname
);
2253 usr_qf_name
= rcu_dereference(sbi
->s_qf_names
[USRQUOTA
]);
2254 grp_qf_name
= rcu_dereference(sbi
->s_qf_names
[GRPQUOTA
]);
2256 seq_show_option(seq
, "usrjquota", usr_qf_name
);
2258 seq_show_option(seq
, "grpjquota", grp_qf_name
);
2263 static const char *token2str(int token
)
2265 const struct match_token
*t
;
2267 for (t
= tokens
; t
->token
!= Opt_err
; t
++)
2268 if (t
->token
== token
&& !strchr(t
->pattern
, '='))
2275 * - it's set to a non-default value OR
2276 * - if the per-sb default is different from the global default
2278 static int _ext4_show_options(struct seq_file
*seq
, struct super_block
*sb
,
2281 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2282 struct ext4_super_block
*es
= sbi
->s_es
;
2283 int def_errors
, def_mount_opt
= sbi
->s_def_mount_opt
;
2284 const struct mount_opts
*m
;
2285 char sep
= nodefs
? '\n' : ',';
2287 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2288 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2290 if (sbi
->s_sb_block
!= 1)
2291 SEQ_OPTS_PRINT("sb=%llu", sbi
->s_sb_block
);
2293 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++) {
2294 int want_set
= m
->flags
& MOPT_SET
;
2295 if (((m
->flags
& (MOPT_SET
|MOPT_CLEAR
)) == 0) ||
2296 (m
->flags
& MOPT_CLEAR_ERR
))
2298 if (!nodefs
&& !(m
->mount_opt
& (sbi
->s_mount_opt
^ def_mount_opt
)))
2299 continue; /* skip if same as the default */
2301 (sbi
->s_mount_opt
& m
->mount_opt
) != m
->mount_opt
) ||
2302 (!want_set
&& (sbi
->s_mount_opt
& m
->mount_opt
)))
2303 continue; /* select Opt_noFoo vs Opt_Foo */
2304 SEQ_OPTS_PRINT("%s", token2str(m
->token
));
2307 if (nodefs
|| !uid_eq(sbi
->s_resuid
, make_kuid(&init_user_ns
, EXT4_DEF_RESUID
)) ||
2308 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
)
2309 SEQ_OPTS_PRINT("resuid=%u",
2310 from_kuid_munged(&init_user_ns
, sbi
->s_resuid
));
2311 if (nodefs
|| !gid_eq(sbi
->s_resgid
, make_kgid(&init_user_ns
, EXT4_DEF_RESGID
)) ||
2312 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
)
2313 SEQ_OPTS_PRINT("resgid=%u",
2314 from_kgid_munged(&init_user_ns
, sbi
->s_resgid
));
2315 def_errors
= nodefs
? -1 : le16_to_cpu(es
->s_errors
);
2316 if (test_opt(sb
, ERRORS_RO
) && def_errors
!= EXT4_ERRORS_RO
)
2317 SEQ_OPTS_PUTS("errors=remount-ro");
2318 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
2319 SEQ_OPTS_PUTS("errors=continue");
2320 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
2321 SEQ_OPTS_PUTS("errors=panic");
2322 if (nodefs
|| sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
)
2323 SEQ_OPTS_PRINT("commit=%lu", sbi
->s_commit_interval
/ HZ
);
2324 if (nodefs
|| sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
)
2325 SEQ_OPTS_PRINT("min_batch_time=%u", sbi
->s_min_batch_time
);
2326 if (nodefs
|| sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
)
2327 SEQ_OPTS_PRINT("max_batch_time=%u", sbi
->s_max_batch_time
);
2328 if (sb
->s_flags
& SB_I_VERSION
)
2329 SEQ_OPTS_PUTS("i_version");
2330 if (nodefs
|| sbi
->s_stripe
)
2331 SEQ_OPTS_PRINT("stripe=%lu", sbi
->s_stripe
);
2332 if (nodefs
|| EXT4_MOUNT_DATA_FLAGS
&
2333 (sbi
->s_mount_opt
^ def_mount_opt
)) {
2334 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
2335 SEQ_OPTS_PUTS("data=journal");
2336 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
2337 SEQ_OPTS_PUTS("data=ordered");
2338 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
2339 SEQ_OPTS_PUTS("data=writeback");
2342 sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
2343 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2344 sbi
->s_inode_readahead_blks
);
2346 if (test_opt(sb
, INIT_INODE_TABLE
) && (nodefs
||
2347 (sbi
->s_li_wait_mult
!= EXT4_DEF_LI_WAIT_MULT
)))
2348 SEQ_OPTS_PRINT("init_itable=%u", sbi
->s_li_wait_mult
);
2349 if (nodefs
|| sbi
->s_max_dir_size_kb
)
2350 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi
->s_max_dir_size_kb
);
2351 if (test_opt(sb
, DATA_ERR_ABORT
))
2352 SEQ_OPTS_PUTS("data_err=abort");
2354 fscrypt_show_test_dummy_encryption(seq
, sep
, sb
);
2356 ext4_show_quota_options(seq
, sb
);
2360 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
)
2362 return _ext4_show_options(seq
, root
->d_sb
, 0);
2365 int ext4_seq_options_show(struct seq_file
*seq
, void *offset
)
2367 struct super_block
*sb
= seq
->private;
2370 seq_puts(seq
, sb_rdonly(sb
) ? "ro" : "rw");
2371 rc
= _ext4_show_options(seq
, sb
, 1);
2372 seq_puts(seq
, "\n");
2376 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
2379 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2382 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
2383 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
2384 "forcing read-only mode");
2389 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
2390 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
2391 "running e2fsck is recommended");
2392 else if (sbi
->s_mount_state
& EXT4_ERROR_FS
)
2393 ext4_msg(sb
, KERN_WARNING
,
2394 "warning: mounting fs with errors, "
2395 "running e2fsck is recommended");
2396 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) > 0 &&
2397 le16_to_cpu(es
->s_mnt_count
) >=
2398 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
2399 ext4_msg(sb
, KERN_WARNING
,
2400 "warning: maximal mount count reached, "
2401 "running e2fsck is recommended");
2402 else if (le32_to_cpu(es
->s_checkinterval
) &&
2403 (ext4_get_tstamp(es
, s_lastcheck
) +
2404 le32_to_cpu(es
->s_checkinterval
) <= ktime_get_real_seconds()))
2405 ext4_msg(sb
, KERN_WARNING
,
2406 "warning: checktime reached, "
2407 "running e2fsck is recommended");
2408 if (!sbi
->s_journal
)
2409 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
2410 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
2411 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
2412 le16_add_cpu(&es
->s_mnt_count
, 1);
2413 ext4_update_tstamp(es
, s_mtime
);
2415 ext4_set_feature_journal_needs_recovery(sb
);
2417 err
= ext4_commit_super(sb
, 1);
2419 if (test_opt(sb
, DEBUG
))
2420 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
2421 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
2423 sbi
->s_groups_count
,
2424 EXT4_BLOCKS_PER_GROUP(sb
),
2425 EXT4_INODES_PER_GROUP(sb
),
2426 sbi
->s_mount_opt
, sbi
->s_mount_opt2
);
2428 cleancache_init_fs(sb
);
2432 int ext4_alloc_flex_bg_array(struct super_block
*sb
, ext4_group_t ngroup
)
2434 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2435 struct flex_groups
**old_groups
, **new_groups
;
2438 if (!sbi
->s_log_groups_per_flex
)
2441 size
= ext4_flex_group(sbi
, ngroup
- 1) + 1;
2442 if (size
<= sbi
->s_flex_groups_allocated
)
2445 new_groups
= kvzalloc(roundup_pow_of_two(size
*
2446 sizeof(*sbi
->s_flex_groups
)), GFP_KERNEL
);
2448 ext4_msg(sb
, KERN_ERR
,
2449 "not enough memory for %d flex group pointers", size
);
2452 for (i
= sbi
->s_flex_groups_allocated
; i
< size
; i
++) {
2453 new_groups
[i
] = kvzalloc(roundup_pow_of_two(
2454 sizeof(struct flex_groups
)),
2456 if (!new_groups
[i
]) {
2457 for (j
= sbi
->s_flex_groups_allocated
; j
< i
; j
++)
2458 kvfree(new_groups
[j
]);
2460 ext4_msg(sb
, KERN_ERR
,
2461 "not enough memory for %d flex groups", size
);
2466 old_groups
= rcu_dereference(sbi
->s_flex_groups
);
2468 memcpy(new_groups
, old_groups
,
2469 (sbi
->s_flex_groups_allocated
*
2470 sizeof(struct flex_groups
*)));
2472 rcu_assign_pointer(sbi
->s_flex_groups
, new_groups
);
2473 sbi
->s_flex_groups_allocated
= size
;
2475 ext4_kvfree_array_rcu(old_groups
);
2479 static int ext4_fill_flex_info(struct super_block
*sb
)
2481 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2482 struct ext4_group_desc
*gdp
= NULL
;
2483 struct flex_groups
*fg
;
2484 ext4_group_t flex_group
;
2487 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
2488 if (sbi
->s_log_groups_per_flex
< 1 || sbi
->s_log_groups_per_flex
> 31) {
2489 sbi
->s_log_groups_per_flex
= 0;
2493 err
= ext4_alloc_flex_bg_array(sb
, sbi
->s_groups_count
);
2497 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
2498 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2500 flex_group
= ext4_flex_group(sbi
, i
);
2501 fg
= sbi_array_rcu_deref(sbi
, s_flex_groups
, flex_group
);
2502 atomic_add(ext4_free_inodes_count(sb
, gdp
), &fg
->free_inodes
);
2503 atomic64_add(ext4_free_group_clusters(sb
, gdp
),
2504 &fg
->free_clusters
);
2505 atomic_add(ext4_used_dirs_count(sb
, gdp
), &fg
->used_dirs
);
2513 static __le16
ext4_group_desc_csum(struct super_block
*sb
, __u32 block_group
,
2514 struct ext4_group_desc
*gdp
)
2516 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
2518 __le32 le_group
= cpu_to_le32(block_group
);
2519 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2521 if (ext4_has_metadata_csum(sbi
->s_sb
)) {
2522 /* Use new metadata_csum algorithm */
2524 __u16 dummy_csum
= 0;
2526 csum32
= ext4_chksum(sbi
, sbi
->s_csum_seed
, (__u8
*)&le_group
,
2528 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)gdp
, offset
);
2529 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)&dummy_csum
,
2530 sizeof(dummy_csum
));
2531 offset
+= sizeof(dummy_csum
);
2532 if (offset
< sbi
->s_desc_size
)
2533 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)gdp
+ offset
,
2534 sbi
->s_desc_size
- offset
);
2536 crc
= csum32
& 0xFFFF;
2540 /* old crc16 code */
2541 if (!ext4_has_feature_gdt_csum(sb
))
2544 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
2545 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
2546 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
2547 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
2548 /* for checksum of struct ext4_group_desc do the rest...*/
2549 if (ext4_has_feature_64bit(sb
) &&
2550 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
2551 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
2552 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
2556 return cpu_to_le16(crc
);
2559 int ext4_group_desc_csum_verify(struct super_block
*sb
, __u32 block_group
,
2560 struct ext4_group_desc
*gdp
)
2562 if (ext4_has_group_desc_csum(sb
) &&
2563 (gdp
->bg_checksum
!= ext4_group_desc_csum(sb
, block_group
, gdp
)))
2569 void ext4_group_desc_csum_set(struct super_block
*sb
, __u32 block_group
,
2570 struct ext4_group_desc
*gdp
)
2572 if (!ext4_has_group_desc_csum(sb
))
2574 gdp
->bg_checksum
= ext4_group_desc_csum(sb
, block_group
, gdp
);
2577 /* Called at mount-time, super-block is locked */
2578 static int ext4_check_descriptors(struct super_block
*sb
,
2579 ext4_fsblk_t sb_block
,
2580 ext4_group_t
*first_not_zeroed
)
2582 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2583 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
2584 ext4_fsblk_t last_block
;
2585 ext4_fsblk_t last_bg_block
= sb_block
+ ext4_bg_num_gdb(sb
, 0);
2586 ext4_fsblk_t block_bitmap
;
2587 ext4_fsblk_t inode_bitmap
;
2588 ext4_fsblk_t inode_table
;
2589 int flexbg_flag
= 0;
2590 ext4_group_t i
, grp
= sbi
->s_groups_count
;
2592 if (ext4_has_feature_flex_bg(sb
))
2595 ext4_debug("Checking group descriptors");
2597 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
2598 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2600 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
2601 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
2603 last_block
= first_block
+
2604 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2606 if ((grp
== sbi
->s_groups_count
) &&
2607 !(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2610 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
2611 if (block_bitmap
== sb_block
) {
2612 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2613 "Block bitmap for group %u overlaps "
2618 if (block_bitmap
>= sb_block
+ 1 &&
2619 block_bitmap
<= last_bg_block
) {
2620 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2621 "Block bitmap for group %u overlaps "
2622 "block group descriptors", i
);
2626 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
2627 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2628 "Block bitmap for group %u not in group "
2629 "(block %llu)!", i
, block_bitmap
);
2632 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
2633 if (inode_bitmap
== sb_block
) {
2634 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2635 "Inode bitmap for group %u overlaps "
2640 if (inode_bitmap
>= sb_block
+ 1 &&
2641 inode_bitmap
<= last_bg_block
) {
2642 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2643 "Inode bitmap for group %u overlaps "
2644 "block group descriptors", i
);
2648 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
2649 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2650 "Inode bitmap for group %u not in group "
2651 "(block %llu)!", i
, inode_bitmap
);
2654 inode_table
= ext4_inode_table(sb
, gdp
);
2655 if (inode_table
== sb_block
) {
2656 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2657 "Inode table for group %u overlaps "
2662 if (inode_table
>= sb_block
+ 1 &&
2663 inode_table
<= last_bg_block
) {
2664 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2665 "Inode table for group %u overlaps "
2666 "block group descriptors", i
);
2670 if (inode_table
< first_block
||
2671 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
2672 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2673 "Inode table for group %u not in group "
2674 "(block %llu)!", i
, inode_table
);
2677 ext4_lock_group(sb
, i
);
2678 if (!ext4_group_desc_csum_verify(sb
, i
, gdp
)) {
2679 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2680 "Checksum for group %u failed (%u!=%u)",
2681 i
, le16_to_cpu(ext4_group_desc_csum(sb
, i
,
2682 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
2683 if (!sb_rdonly(sb
)) {
2684 ext4_unlock_group(sb
, i
);
2688 ext4_unlock_group(sb
, i
);
2690 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
2692 if (NULL
!= first_not_zeroed
)
2693 *first_not_zeroed
= grp
;
2697 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2698 * the superblock) which were deleted from all directories, but held open by
2699 * a process at the time of a crash. We walk the list and try to delete these
2700 * inodes at recovery time (only with a read-write filesystem).
2702 * In order to keep the orphan inode chain consistent during traversal (in
2703 * case of crash during recovery), we link each inode into the superblock
2704 * orphan list_head and handle it the same way as an inode deletion during
2705 * normal operation (which journals the operations for us).
2707 * We only do an iget() and an iput() on each inode, which is very safe if we
2708 * accidentally point at an in-use or already deleted inode. The worst that
2709 * can happen in this case is that we get a "bit already cleared" message from
2710 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2711 * e2fsck was run on this filesystem, and it must have already done the orphan
2712 * inode cleanup for us, so we can safely abort without any further action.
2714 static void ext4_orphan_cleanup(struct super_block
*sb
,
2715 struct ext4_super_block
*es
)
2717 unsigned int s_flags
= sb
->s_flags
;
2718 int ret
, nr_orphans
= 0, nr_truncates
= 0;
2720 int quota_update
= 0;
2723 if (!es
->s_last_orphan
) {
2724 jbd_debug(4, "no orphan inodes to clean up\n");
2728 if (bdev_read_only(sb
->s_bdev
)) {
2729 ext4_msg(sb
, KERN_ERR
, "write access "
2730 "unavailable, skipping orphan cleanup");
2734 /* Check if feature set would not allow a r/w mount */
2735 if (!ext4_feature_set_ok(sb
, 0)) {
2736 ext4_msg(sb
, KERN_INFO
, "Skipping orphan cleanup due to "
2737 "unknown ROCOMPAT features");
2741 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2742 /* don't clear list on RO mount w/ errors */
2743 if (es
->s_last_orphan
&& !(s_flags
& SB_RDONLY
)) {
2744 ext4_msg(sb
, KERN_INFO
, "Errors on filesystem, "
2745 "clearing orphan list.\n");
2746 es
->s_last_orphan
= 0;
2748 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2752 if (s_flags
& SB_RDONLY
) {
2753 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
2754 sb
->s_flags
&= ~SB_RDONLY
;
2757 /* Needed for iput() to work correctly and not trash data */
2758 sb
->s_flags
|= SB_ACTIVE
;
2761 * Turn on quotas which were not enabled for read-only mounts if
2762 * filesystem has quota feature, so that they are updated correctly.
2764 if (ext4_has_feature_quota(sb
) && (s_flags
& SB_RDONLY
)) {
2765 int ret
= ext4_enable_quotas(sb
);
2770 ext4_msg(sb
, KERN_ERR
,
2771 "Cannot turn on quotas: error %d", ret
);
2774 /* Turn on journaled quotas used for old sytle */
2775 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++) {
2776 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
2777 int ret
= ext4_quota_on_mount(sb
, i
);
2782 ext4_msg(sb
, KERN_ERR
,
2783 "Cannot turn on journaled "
2784 "quota: type %d: error %d", i
, ret
);
2789 while (es
->s_last_orphan
) {
2790 struct inode
*inode
;
2793 * We may have encountered an error during cleanup; if
2794 * so, skip the rest.
2796 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
2797 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2798 es
->s_last_orphan
= 0;
2802 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
2803 if (IS_ERR(inode
)) {
2804 es
->s_last_orphan
= 0;
2808 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
2809 dquot_initialize(inode
);
2810 if (inode
->i_nlink
) {
2811 if (test_opt(sb
, DEBUG
))
2812 ext4_msg(sb
, KERN_DEBUG
,
2813 "%s: truncating inode %lu to %lld bytes",
2814 __func__
, inode
->i_ino
, inode
->i_size
);
2815 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2816 inode
->i_ino
, inode
->i_size
);
2818 truncate_inode_pages(inode
->i_mapping
, inode
->i_size
);
2819 ret
= ext4_truncate(inode
);
2821 ext4_std_error(inode
->i_sb
, ret
);
2822 inode_unlock(inode
);
2825 if (test_opt(sb
, DEBUG
))
2826 ext4_msg(sb
, KERN_DEBUG
,
2827 "%s: deleting unreferenced inode %lu",
2828 __func__
, inode
->i_ino
);
2829 jbd_debug(2, "deleting unreferenced inode %lu\n",
2833 iput(inode
); /* The delete magic happens here! */
2836 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2839 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
2840 PLURAL(nr_orphans
));
2842 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
2843 PLURAL(nr_truncates
));
2845 /* Turn off quotas if they were enabled for orphan cleanup */
2847 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++) {
2848 if (sb_dqopt(sb
)->files
[i
])
2849 dquot_quota_off(sb
, i
);
2853 sb
->s_flags
= s_flags
; /* Restore SB_RDONLY status */
2857 * Maximal extent format file size.
2858 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2859 * extent format containers, within a sector_t, and within i_blocks
2860 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2861 * so that won't be a limiting factor.
2863 * However there is other limiting factor. We do store extents in the form
2864 * of starting block and length, hence the resulting length of the extent
2865 * covering maximum file size must fit into on-disk format containers as
2866 * well. Given that length is always by 1 unit bigger than max unit (because
2867 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2869 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2871 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
2874 loff_t upper_limit
= MAX_LFS_FILESIZE
;
2876 BUILD_BUG_ON(sizeof(blkcnt_t
) < sizeof(u64
));
2878 if (!has_huge_files
) {
2879 upper_limit
= (1LL << 32) - 1;
2881 /* total blocks in file system block size */
2882 upper_limit
>>= (blkbits
- 9);
2883 upper_limit
<<= blkbits
;
2887 * 32-bit extent-start container, ee_block. We lower the maxbytes
2888 * by one fs block, so ee_len can cover the extent of maximum file
2891 res
= (1LL << 32) - 1;
2894 /* Sanity check against vm- & vfs- imposed limits */
2895 if (res
> upper_limit
)
2902 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2903 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2904 * We need to be 1 filesystem block less than the 2^48 sector limit.
2906 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
2908 loff_t res
= EXT4_NDIR_BLOCKS
;
2911 /* This is calculated to be the largest file size for a dense, block
2912 * mapped file such that the file's total number of 512-byte sectors,
2913 * including data and all indirect blocks, does not exceed (2^48 - 1).
2915 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2916 * number of 512-byte sectors of the file.
2919 if (!has_huge_files
) {
2921 * !has_huge_files or implies that the inode i_block field
2922 * represents total file blocks in 2^32 512-byte sectors ==
2923 * size of vfs inode i_blocks * 8
2925 upper_limit
= (1LL << 32) - 1;
2927 /* total blocks in file system block size */
2928 upper_limit
>>= (bits
- 9);
2932 * We use 48 bit ext4_inode i_blocks
2933 * With EXT4_HUGE_FILE_FL set the i_blocks
2934 * represent total number of blocks in
2935 * file system block size
2937 upper_limit
= (1LL << 48) - 1;
2941 /* indirect blocks */
2943 /* double indirect blocks */
2944 meta_blocks
+= 1 + (1LL << (bits
-2));
2945 /* tripple indirect blocks */
2946 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
2948 upper_limit
-= meta_blocks
;
2949 upper_limit
<<= bits
;
2951 res
+= 1LL << (bits
-2);
2952 res
+= 1LL << (2*(bits
-2));
2953 res
+= 1LL << (3*(bits
-2));
2955 if (res
> upper_limit
)
2958 if (res
> MAX_LFS_FILESIZE
)
2959 res
= MAX_LFS_FILESIZE
;
2964 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
2965 ext4_fsblk_t logical_sb_block
, int nr
)
2967 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2968 ext4_group_t bg
, first_meta_bg
;
2971 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
2973 if (!ext4_has_feature_meta_bg(sb
) || nr
< first_meta_bg
)
2974 return logical_sb_block
+ nr
+ 1;
2975 bg
= sbi
->s_desc_per_block
* nr
;
2976 if (ext4_bg_has_super(sb
, bg
))
2980 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2981 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2982 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2985 if (sb
->s_blocksize
== 1024 && nr
== 0 &&
2986 le32_to_cpu(sbi
->s_es
->s_first_data_block
) == 0)
2989 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
2993 * ext4_get_stripe_size: Get the stripe size.
2994 * @sbi: In memory super block info
2996 * If we have specified it via mount option, then
2997 * use the mount option value. If the value specified at mount time is
2998 * greater than the blocks per group use the super block value.
2999 * If the super block value is greater than blocks per group return 0.
3000 * Allocator needs it be less than blocks per group.
3003 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
3005 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
3006 unsigned long stripe_width
=
3007 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
3010 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
3011 ret
= sbi
->s_stripe
;
3012 else if (stripe_width
&& stripe_width
<= sbi
->s_blocks_per_group
)
3014 else if (stride
&& stride
<= sbi
->s_blocks_per_group
)
3020 * If the stripe width is 1, this makes no sense and
3021 * we set it to 0 to turn off stripe handling code.
3030 * Check whether this filesystem can be mounted based on
3031 * the features present and the RDONLY/RDWR mount requested.
3032 * Returns 1 if this filesystem can be mounted as requested,
3033 * 0 if it cannot be.
3035 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
3037 if (ext4_has_unknown_ext4_incompat_features(sb
)) {
3038 ext4_msg(sb
, KERN_ERR
,
3039 "Couldn't mount because of "
3040 "unsupported optional features (%x)",
3041 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
3042 ~EXT4_FEATURE_INCOMPAT_SUPP
));
3046 #ifndef CONFIG_UNICODE
3047 if (ext4_has_feature_casefold(sb
)) {
3048 ext4_msg(sb
, KERN_ERR
,
3049 "Filesystem with casefold feature cannot be "
3050 "mounted without CONFIG_UNICODE");
3058 if (ext4_has_feature_readonly(sb
)) {
3059 ext4_msg(sb
, KERN_INFO
, "filesystem is read-only");
3060 sb
->s_flags
|= SB_RDONLY
;
3064 /* Check that feature set is OK for a read-write mount */
3065 if (ext4_has_unknown_ext4_ro_compat_features(sb
)) {
3066 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
3067 "unsupported optional features (%x)",
3068 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
3069 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
3072 if (ext4_has_feature_bigalloc(sb
) && !ext4_has_feature_extents(sb
)) {
3073 ext4_msg(sb
, KERN_ERR
,
3074 "Can't support bigalloc feature without "
3075 "extents feature\n");
3079 #if !IS_ENABLED(CONFIG_QUOTA) || !IS_ENABLED(CONFIG_QFMT_V2)
3080 if (!readonly
&& (ext4_has_feature_quota(sb
) ||
3081 ext4_has_feature_project(sb
))) {
3082 ext4_msg(sb
, KERN_ERR
,
3083 "The kernel was not built with CONFIG_QUOTA and CONFIG_QFMT_V2");
3086 #endif /* CONFIG_QUOTA */
3091 * This function is called once a day if we have errors logged
3092 * on the file system
3094 static void print_daily_error_info(struct timer_list
*t
)
3096 struct ext4_sb_info
*sbi
= from_timer(sbi
, t
, s_err_report
);
3097 struct super_block
*sb
= sbi
->s_sb
;
3098 struct ext4_super_block
*es
= sbi
->s_es
;
3100 if (es
->s_error_count
)
3101 /* fsck newer than v1.41.13 is needed to clean this condition. */
3102 ext4_msg(sb
, KERN_NOTICE
, "error count since last fsck: %u",
3103 le32_to_cpu(es
->s_error_count
));
3104 if (es
->s_first_error_time
) {
3105 printk(KERN_NOTICE
"EXT4-fs (%s): initial error at time %llu: %.*s:%d",
3107 ext4_get_tstamp(es
, s_first_error_time
),
3108 (int) sizeof(es
->s_first_error_func
),
3109 es
->s_first_error_func
,
3110 le32_to_cpu(es
->s_first_error_line
));
3111 if (es
->s_first_error_ino
)
3112 printk(KERN_CONT
": inode %u",
3113 le32_to_cpu(es
->s_first_error_ino
));
3114 if (es
->s_first_error_block
)
3115 printk(KERN_CONT
": block %llu", (unsigned long long)
3116 le64_to_cpu(es
->s_first_error_block
));
3117 printk(KERN_CONT
"\n");
3119 if (es
->s_last_error_time
) {
3120 printk(KERN_NOTICE
"EXT4-fs (%s): last error at time %llu: %.*s:%d",
3122 ext4_get_tstamp(es
, s_last_error_time
),
3123 (int) sizeof(es
->s_last_error_func
),
3124 es
->s_last_error_func
,
3125 le32_to_cpu(es
->s_last_error_line
));
3126 if (es
->s_last_error_ino
)
3127 printk(KERN_CONT
": inode %u",
3128 le32_to_cpu(es
->s_last_error_ino
));
3129 if (es
->s_last_error_block
)
3130 printk(KERN_CONT
": block %llu", (unsigned long long)
3131 le64_to_cpu(es
->s_last_error_block
));
3132 printk(KERN_CONT
"\n");
3134 mod_timer(&sbi
->s_err_report
, jiffies
+ 24*60*60*HZ
); /* Once a day */
3137 /* Find next suitable group and run ext4_init_inode_table */
3138 static int ext4_run_li_request(struct ext4_li_request
*elr
)
3140 struct ext4_group_desc
*gdp
= NULL
;
3141 ext4_group_t group
, ngroups
;
3142 struct super_block
*sb
;
3143 unsigned long timeout
= 0;
3147 ngroups
= EXT4_SB(sb
)->s_groups_count
;
3149 for (group
= elr
->lr_next_group
; group
< ngroups
; group
++) {
3150 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
3156 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
3160 if (group
>= ngroups
)
3165 ret
= ext4_init_inode_table(sb
, group
,
3166 elr
->lr_timeout
? 0 : 1);
3167 if (elr
->lr_timeout
== 0) {
3168 timeout
= (jiffies
- timeout
) *
3169 elr
->lr_sbi
->s_li_wait_mult
;
3170 elr
->lr_timeout
= timeout
;
3172 elr
->lr_next_sched
= jiffies
+ elr
->lr_timeout
;
3173 elr
->lr_next_group
= group
+ 1;
3179 * Remove lr_request from the list_request and free the
3180 * request structure. Should be called with li_list_mtx held
3182 static void ext4_remove_li_request(struct ext4_li_request
*elr
)
3184 struct ext4_sb_info
*sbi
;
3191 list_del(&elr
->lr_request
);
3192 sbi
->s_li_request
= NULL
;
3196 static void ext4_unregister_li_request(struct super_block
*sb
)
3198 mutex_lock(&ext4_li_mtx
);
3199 if (!ext4_li_info
) {
3200 mutex_unlock(&ext4_li_mtx
);
3204 mutex_lock(&ext4_li_info
->li_list_mtx
);
3205 ext4_remove_li_request(EXT4_SB(sb
)->s_li_request
);
3206 mutex_unlock(&ext4_li_info
->li_list_mtx
);
3207 mutex_unlock(&ext4_li_mtx
);
3210 static struct task_struct
*ext4_lazyinit_task
;
3213 * This is the function where ext4lazyinit thread lives. It walks
3214 * through the request list searching for next scheduled filesystem.
3215 * When such a fs is found, run the lazy initialization request
3216 * (ext4_rn_li_request) and keep track of the time spend in this
3217 * function. Based on that time we compute next schedule time of
3218 * the request. When walking through the list is complete, compute
3219 * next waking time and put itself into sleep.
3221 static int ext4_lazyinit_thread(void *arg
)
3223 struct ext4_lazy_init
*eli
= (struct ext4_lazy_init
*)arg
;
3224 struct list_head
*pos
, *n
;
3225 struct ext4_li_request
*elr
;
3226 unsigned long next_wakeup
, cur
;
3228 BUG_ON(NULL
== eli
);
3232 next_wakeup
= MAX_JIFFY_OFFSET
;
3234 mutex_lock(&eli
->li_list_mtx
);
3235 if (list_empty(&eli
->li_request_list
)) {
3236 mutex_unlock(&eli
->li_list_mtx
);
3239 list_for_each_safe(pos
, n
, &eli
->li_request_list
) {
3242 elr
= list_entry(pos
, struct ext4_li_request
,
3245 if (time_before(jiffies
, elr
->lr_next_sched
)) {
3246 if (time_before(elr
->lr_next_sched
, next_wakeup
))
3247 next_wakeup
= elr
->lr_next_sched
;
3250 if (down_read_trylock(&elr
->lr_super
->s_umount
)) {
3251 if (sb_start_write_trylock(elr
->lr_super
)) {
3254 * We hold sb->s_umount, sb can not
3255 * be removed from the list, it is
3256 * now safe to drop li_list_mtx
3258 mutex_unlock(&eli
->li_list_mtx
);
3259 err
= ext4_run_li_request(elr
);
3260 sb_end_write(elr
->lr_super
);
3261 mutex_lock(&eli
->li_list_mtx
);
3264 up_read((&elr
->lr_super
->s_umount
));
3266 /* error, remove the lazy_init job */
3268 ext4_remove_li_request(elr
);
3272 elr
->lr_next_sched
= jiffies
+
3274 % (EXT4_DEF_LI_MAX_START_DELAY
* HZ
));
3276 if (time_before(elr
->lr_next_sched
, next_wakeup
))
3277 next_wakeup
= elr
->lr_next_sched
;
3279 mutex_unlock(&eli
->li_list_mtx
);
3284 if ((time_after_eq(cur
, next_wakeup
)) ||
3285 (MAX_JIFFY_OFFSET
== next_wakeup
)) {
3290 schedule_timeout_interruptible(next_wakeup
- cur
);
3292 if (kthread_should_stop()) {
3293 ext4_clear_request_list();
3300 * It looks like the request list is empty, but we need
3301 * to check it under the li_list_mtx lock, to prevent any
3302 * additions into it, and of course we should lock ext4_li_mtx
3303 * to atomically free the list and ext4_li_info, because at
3304 * this point another ext4 filesystem could be registering
3307 mutex_lock(&ext4_li_mtx
);
3308 mutex_lock(&eli
->li_list_mtx
);
3309 if (!list_empty(&eli
->li_request_list
)) {
3310 mutex_unlock(&eli
->li_list_mtx
);
3311 mutex_unlock(&ext4_li_mtx
);
3314 mutex_unlock(&eli
->li_list_mtx
);
3315 kfree(ext4_li_info
);
3316 ext4_li_info
= NULL
;
3317 mutex_unlock(&ext4_li_mtx
);
3322 static void ext4_clear_request_list(void)
3324 struct list_head
*pos
, *n
;
3325 struct ext4_li_request
*elr
;
3327 mutex_lock(&ext4_li_info
->li_list_mtx
);
3328 list_for_each_safe(pos
, n
, &ext4_li_info
->li_request_list
) {
3329 elr
= list_entry(pos
, struct ext4_li_request
,
3331 ext4_remove_li_request(elr
);
3333 mutex_unlock(&ext4_li_info
->li_list_mtx
);
3336 static int ext4_run_lazyinit_thread(void)
3338 ext4_lazyinit_task
= kthread_run(ext4_lazyinit_thread
,
3339 ext4_li_info
, "ext4lazyinit");
3340 if (IS_ERR(ext4_lazyinit_task
)) {
3341 int err
= PTR_ERR(ext4_lazyinit_task
);
3342 ext4_clear_request_list();
3343 kfree(ext4_li_info
);
3344 ext4_li_info
= NULL
;
3345 printk(KERN_CRIT
"EXT4-fs: error %d creating inode table "
3346 "initialization thread\n",
3350 ext4_li_info
->li_state
|= EXT4_LAZYINIT_RUNNING
;
3355 * Check whether it make sense to run itable init. thread or not.
3356 * If there is at least one uninitialized inode table, return
3357 * corresponding group number, else the loop goes through all
3358 * groups and return total number of groups.
3360 static ext4_group_t
ext4_has_uninit_itable(struct super_block
*sb
)
3362 ext4_group_t group
, ngroups
= EXT4_SB(sb
)->s_groups_count
;
3363 struct ext4_group_desc
*gdp
= NULL
;
3365 if (!ext4_has_group_desc_csum(sb
))
3368 for (group
= 0; group
< ngroups
; group
++) {
3369 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
3373 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
3380 static int ext4_li_info_new(void)
3382 struct ext4_lazy_init
*eli
= NULL
;
3384 eli
= kzalloc(sizeof(*eli
), GFP_KERNEL
);
3388 INIT_LIST_HEAD(&eli
->li_request_list
);
3389 mutex_init(&eli
->li_list_mtx
);
3391 eli
->li_state
|= EXT4_LAZYINIT_QUIT
;
3398 static struct ext4_li_request
*ext4_li_request_new(struct super_block
*sb
,
3401 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3402 struct ext4_li_request
*elr
;
3404 elr
= kzalloc(sizeof(*elr
), GFP_KERNEL
);
3410 elr
->lr_next_group
= start
;
3413 * Randomize first schedule time of the request to
3414 * spread the inode table initialization requests
3417 elr
->lr_next_sched
= jiffies
+ (prandom_u32() %
3418 (EXT4_DEF_LI_MAX_START_DELAY
* HZ
));
3422 int ext4_register_li_request(struct super_block
*sb
,
3423 ext4_group_t first_not_zeroed
)
3425 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3426 struct ext4_li_request
*elr
= NULL
;
3427 ext4_group_t ngroups
= sbi
->s_groups_count
;
3430 mutex_lock(&ext4_li_mtx
);
3431 if (sbi
->s_li_request
!= NULL
) {
3433 * Reset timeout so it can be computed again, because
3434 * s_li_wait_mult might have changed.
3436 sbi
->s_li_request
->lr_timeout
= 0;
3440 if (first_not_zeroed
== ngroups
|| sb_rdonly(sb
) ||
3441 !test_opt(sb
, INIT_INODE_TABLE
))
3444 elr
= ext4_li_request_new(sb
, first_not_zeroed
);
3450 if (NULL
== ext4_li_info
) {
3451 ret
= ext4_li_info_new();
3456 mutex_lock(&ext4_li_info
->li_list_mtx
);
3457 list_add(&elr
->lr_request
, &ext4_li_info
->li_request_list
);
3458 mutex_unlock(&ext4_li_info
->li_list_mtx
);
3460 sbi
->s_li_request
= elr
;
3462 * set elr to NULL here since it has been inserted to
3463 * the request_list and the removal and free of it is
3464 * handled by ext4_clear_request_list from now on.
3468 if (!(ext4_li_info
->li_state
& EXT4_LAZYINIT_RUNNING
)) {
3469 ret
= ext4_run_lazyinit_thread();
3474 mutex_unlock(&ext4_li_mtx
);
3481 * We do not need to lock anything since this is called on
3484 static void ext4_destroy_lazyinit_thread(void)
3487 * If thread exited earlier
3488 * there's nothing to be done.
3490 if (!ext4_li_info
|| !ext4_lazyinit_task
)
3493 kthread_stop(ext4_lazyinit_task
);
3496 static int set_journal_csum_feature_set(struct super_block
*sb
)
3499 int compat
, incompat
;
3500 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3502 if (ext4_has_metadata_csum(sb
)) {
3503 /* journal checksum v3 */
3505 incompat
= JBD2_FEATURE_INCOMPAT_CSUM_V3
;
3507 /* journal checksum v1 */
3508 compat
= JBD2_FEATURE_COMPAT_CHECKSUM
;
3512 jbd2_journal_clear_features(sbi
->s_journal
,
3513 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
3514 JBD2_FEATURE_INCOMPAT_CSUM_V3
|
3515 JBD2_FEATURE_INCOMPAT_CSUM_V2
);
3516 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
3517 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3519 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
|
3521 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
3522 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3525 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3526 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3528 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3529 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3536 * Note: calculating the overhead so we can be compatible with
3537 * historical BSD practice is quite difficult in the face of
3538 * clusters/bigalloc. This is because multiple metadata blocks from
3539 * different block group can end up in the same allocation cluster.
3540 * Calculating the exact overhead in the face of clustered allocation
3541 * requires either O(all block bitmaps) in memory or O(number of block
3542 * groups**2) in time. We will still calculate the superblock for
3543 * older file systems --- and if we come across with a bigalloc file
3544 * system with zero in s_overhead_clusters the estimate will be close to
3545 * correct especially for very large cluster sizes --- but for newer
3546 * file systems, it's better to calculate this figure once at mkfs
3547 * time, and store it in the superblock. If the superblock value is
3548 * present (even for non-bigalloc file systems), we will use it.
3550 static int count_overhead(struct super_block
*sb
, ext4_group_t grp
,
3553 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3554 struct ext4_group_desc
*gdp
;
3555 ext4_fsblk_t first_block
, last_block
, b
;
3556 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3557 int s
, j
, count
= 0;
3559 if (!ext4_has_feature_bigalloc(sb
))
3560 return (ext4_bg_has_super(sb
, grp
) + ext4_bg_num_gdb(sb
, grp
) +
3561 sbi
->s_itb_per_group
+ 2);
3563 first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
) +
3564 (grp
* EXT4_BLOCKS_PER_GROUP(sb
));
3565 last_block
= first_block
+ EXT4_BLOCKS_PER_GROUP(sb
) - 1;
3566 for (i
= 0; i
< ngroups
; i
++) {
3567 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
3568 b
= ext4_block_bitmap(sb
, gdp
);
3569 if (b
>= first_block
&& b
<= last_block
) {
3570 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3573 b
= ext4_inode_bitmap(sb
, gdp
);
3574 if (b
>= first_block
&& b
<= last_block
) {
3575 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3578 b
= ext4_inode_table(sb
, gdp
);
3579 if (b
>= first_block
&& b
+ sbi
->s_itb_per_group
<= last_block
)
3580 for (j
= 0; j
< sbi
->s_itb_per_group
; j
++, b
++) {
3581 int c
= EXT4_B2C(sbi
, b
- first_block
);
3582 ext4_set_bit(c
, buf
);
3588 if (ext4_bg_has_super(sb
, grp
)) {
3589 ext4_set_bit(s
++, buf
);
3592 j
= ext4_bg_num_gdb(sb
, grp
);
3593 if (s
+ j
> EXT4_BLOCKS_PER_GROUP(sb
)) {
3594 ext4_error(sb
, "Invalid number of block group "
3595 "descriptor blocks: %d", j
);
3596 j
= EXT4_BLOCKS_PER_GROUP(sb
) - s
;
3600 ext4_set_bit(EXT4_B2C(sbi
, s
++), buf
);
3604 return EXT4_CLUSTERS_PER_GROUP(sb
) -
3605 ext4_count_free(buf
, EXT4_CLUSTERS_PER_GROUP(sb
) / 8);
3609 * Compute the overhead and stash it in sbi->s_overhead
3611 int ext4_calculate_overhead(struct super_block
*sb
)
3613 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3614 struct ext4_super_block
*es
= sbi
->s_es
;
3615 struct inode
*j_inode
;
3616 unsigned int j_blocks
, j_inum
= le32_to_cpu(es
->s_journal_inum
);
3617 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3618 ext4_fsblk_t overhead
= 0;
3619 char *buf
= (char *) get_zeroed_page(GFP_NOFS
);
3625 * Compute the overhead (FS structures). This is constant
3626 * for a given filesystem unless the number of block groups
3627 * changes so we cache the previous value until it does.
3631 * All of the blocks before first_data_block are overhead
3633 overhead
= EXT4_B2C(sbi
, le32_to_cpu(es
->s_first_data_block
));
3636 * Add the overhead found in each block group
3638 for (i
= 0; i
< ngroups
; i
++) {
3641 blks
= count_overhead(sb
, i
, buf
);
3644 memset(buf
, 0, PAGE_SIZE
);
3649 * Add the internal journal blocks whether the journal has been
3652 if (sbi
->s_journal
&& !sbi
->journal_bdev
)
3653 overhead
+= EXT4_NUM_B2C(sbi
, sbi
->s_journal
->j_maxlen
);
3654 else if (ext4_has_feature_journal(sb
) && !sbi
->s_journal
&& j_inum
) {
3655 /* j_inum for internal journal is non-zero */
3656 j_inode
= ext4_get_journal_inode(sb
, j_inum
);
3658 j_blocks
= j_inode
->i_size
>> sb
->s_blocksize_bits
;
3659 overhead
+= EXT4_NUM_B2C(sbi
, j_blocks
);
3662 ext4_msg(sb
, KERN_ERR
, "can't get journal size");
3665 sbi
->s_overhead
= overhead
;
3667 free_page((unsigned long) buf
);
3671 static void ext4_set_resv_clusters(struct super_block
*sb
)
3673 ext4_fsblk_t resv_clusters
;
3674 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3677 * There's no need to reserve anything when we aren't using extents.
3678 * The space estimates are exact, there are no unwritten extents,
3679 * hole punching doesn't need new metadata... This is needed especially
3680 * to keep ext2/3 backward compatibility.
3682 if (!ext4_has_feature_extents(sb
))
3685 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3686 * This should cover the situations where we can not afford to run
3687 * out of space like for example punch hole, or converting
3688 * unwritten extents in delalloc path. In most cases such
3689 * allocation would require 1, or 2 blocks, higher numbers are
3692 resv_clusters
= (ext4_blocks_count(sbi
->s_es
) >>
3693 sbi
->s_cluster_bits
);
3695 do_div(resv_clusters
, 50);
3696 resv_clusters
= min_t(ext4_fsblk_t
, resv_clusters
, 4096);
3698 atomic64_set(&sbi
->s_resv_clusters
, resv_clusters
);
3701 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
3703 struct dax_device
*dax_dev
= fs_dax_get_by_bdev(sb
->s_bdev
);
3704 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
3705 struct buffer_head
*bh
, **group_desc
;
3706 struct ext4_super_block
*es
= NULL
;
3707 struct ext4_sb_info
*sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
3708 struct flex_groups
**flex_groups
;
3710 ext4_fsblk_t sb_block
= get_sb_block(&data
);
3711 ext4_fsblk_t logical_sb_block
;
3712 unsigned long offset
= 0;
3713 unsigned long journal_devnum
= 0;
3714 unsigned long def_mount_opts
;
3718 int blocksize
, clustersize
;
3719 unsigned int db_count
;
3721 int needs_recovery
, has_huge_files
, has_bigalloc
;
3724 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
3725 ext4_group_t first_not_zeroed
;
3727 if ((data
&& !orig_data
) || !sbi
)
3730 sbi
->s_daxdev
= dax_dev
;
3731 sbi
->s_blockgroup_lock
=
3732 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
3733 if (!sbi
->s_blockgroup_lock
)
3736 sb
->s_fs_info
= sbi
;
3738 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
3739 sbi
->s_sb_block
= sb_block
;
3740 if (sb
->s_bdev
->bd_part
)
3741 sbi
->s_sectors_written_start
=
3742 part_stat_read(sb
->s_bdev
->bd_part
, sectors
[STAT_WRITE
]);
3744 /* Cleanup superblock name */
3745 strreplace(sb
->s_id
, '/', '!');
3747 /* -EINVAL is default */
3749 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
3751 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
3756 * The ext4 superblock will not be buffer aligned for other than 1kB
3757 * block sizes. We need to calculate the offset from buffer start.
3759 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
3760 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
3761 offset
= do_div(logical_sb_block
, blocksize
);
3763 logical_sb_block
= sb_block
;
3766 if (!(bh
= sb_bread_unmovable(sb
, logical_sb_block
))) {
3767 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
3771 * Note: s_es must be initialized as soon as possible because
3772 * some ext4 macro-instructions depend on its value
3774 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
3776 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
3777 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
3779 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
3781 /* Warn if metadata_csum and gdt_csum are both set. */
3782 if (ext4_has_feature_metadata_csum(sb
) &&
3783 ext4_has_feature_gdt_csum(sb
))
3784 ext4_warning(sb
, "metadata_csum and uninit_bg are "
3785 "redundant flags; please run fsck.");
3787 /* Check for a known checksum algorithm */
3788 if (!ext4_verify_csum_type(sb
, es
)) {
3789 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3790 "unknown checksum algorithm.");
3795 /* Load the checksum driver */
3796 sbi
->s_chksum_driver
= crypto_alloc_shash("crc32c", 0, 0);
3797 if (IS_ERR(sbi
->s_chksum_driver
)) {
3798 ext4_msg(sb
, KERN_ERR
, "Cannot load crc32c driver.");
3799 ret
= PTR_ERR(sbi
->s_chksum_driver
);
3800 sbi
->s_chksum_driver
= NULL
;
3804 /* Check superblock checksum */
3805 if (!ext4_superblock_csum_verify(sb
, es
)) {
3806 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
3807 "invalid superblock checksum. Run e2fsck?");
3813 /* Precompute checksum seed for all metadata */
3814 if (ext4_has_feature_csum_seed(sb
))
3815 sbi
->s_csum_seed
= le32_to_cpu(es
->s_checksum_seed
);
3816 else if (ext4_has_metadata_csum(sb
) || ext4_has_feature_ea_inode(sb
))
3817 sbi
->s_csum_seed
= ext4_chksum(sbi
, ~0, es
->s_uuid
,
3818 sizeof(es
->s_uuid
));
3820 /* Set defaults before we parse the mount options */
3821 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
3822 set_opt(sb
, INIT_INODE_TABLE
);
3823 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
3825 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
3827 if (def_mount_opts
& EXT4_DEFM_UID16
)
3828 set_opt(sb
, NO_UID32
);
3829 /* xattr user namespace & acls are now defaulted on */
3830 set_opt(sb
, XATTR_USER
);
3831 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3832 set_opt(sb
, POSIX_ACL
);
3834 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3835 if (ext4_has_metadata_csum(sb
))
3836 set_opt(sb
, JOURNAL_CHECKSUM
);
3838 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
3839 set_opt(sb
, JOURNAL_DATA
);
3840 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
3841 set_opt(sb
, ORDERED_DATA
);
3842 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
3843 set_opt(sb
, WRITEBACK_DATA
);
3845 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
3846 set_opt(sb
, ERRORS_PANIC
);
3847 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
3848 set_opt(sb
, ERRORS_CONT
);
3850 set_opt(sb
, ERRORS_RO
);
3851 /* block_validity enabled by default; disable with noblock_validity */
3852 set_opt(sb
, BLOCK_VALIDITY
);
3853 if (def_mount_opts
& EXT4_DEFM_DISCARD
)
3854 set_opt(sb
, DISCARD
);
3856 sbi
->s_resuid
= make_kuid(&init_user_ns
, le16_to_cpu(es
->s_def_resuid
));
3857 sbi
->s_resgid
= make_kgid(&init_user_ns
, le16_to_cpu(es
->s_def_resgid
));
3858 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
3859 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
3860 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
3862 if ((def_mount_opts
& EXT4_DEFM_NOBARRIER
) == 0)
3863 set_opt(sb
, BARRIER
);
3866 * enable delayed allocation by default
3867 * Use -o nodelalloc to turn it off
3869 if (!IS_EXT3_SB(sb
) && !IS_EXT2_SB(sb
) &&
3870 ((def_mount_opts
& EXT4_DEFM_NODELALLOC
) == 0))
3871 set_opt(sb
, DELALLOC
);
3874 * set default s_li_wait_mult for lazyinit, for the case there is
3875 * no mount option specified.
3877 sbi
->s_li_wait_mult
= EXT4_DEF_LI_WAIT_MULT
;
3879 blocksize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
3881 if (blocksize
== PAGE_SIZE
)
3882 set_opt(sb
, DIOREAD_NOLOCK
);
3884 if (blocksize
< EXT4_MIN_BLOCK_SIZE
||
3885 blocksize
> EXT4_MAX_BLOCK_SIZE
) {
3886 ext4_msg(sb
, KERN_ERR
,
3887 "Unsupported filesystem blocksize %d (%d log_block_size)",
3888 blocksize
, le32_to_cpu(es
->s_log_block_size
));
3892 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
3893 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
3894 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
3896 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
3897 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
3898 if (sbi
->s_first_ino
< EXT4_GOOD_OLD_FIRST_INO
) {
3899 ext4_msg(sb
, KERN_ERR
, "invalid first ino: %u",
3903 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
3904 (!is_power_of_2(sbi
->s_inode_size
)) ||
3905 (sbi
->s_inode_size
> blocksize
)) {
3906 ext4_msg(sb
, KERN_ERR
,
3907 "unsupported inode size: %d",
3909 ext4_msg(sb
, KERN_ERR
, "blocksize: %d", blocksize
);
3913 * i_atime_extra is the last extra field available for
3914 * [acm]times in struct ext4_inode. Checking for that
3915 * field should suffice to ensure we have extra space
3918 if (sbi
->s_inode_size
>= offsetof(struct ext4_inode
, i_atime_extra
) +
3919 sizeof(((struct ext4_inode
*)0)->i_atime_extra
)) {
3920 sb
->s_time_gran
= 1;
3921 sb
->s_time_max
= EXT4_EXTRA_TIMESTAMP_MAX
;
3923 sb
->s_time_gran
= NSEC_PER_SEC
;
3924 sb
->s_time_max
= EXT4_NON_EXTRA_TIMESTAMP_MAX
;
3926 sb
->s_time_min
= EXT4_TIMESTAMP_MIN
;
3928 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
3929 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
3930 EXT4_GOOD_OLD_INODE_SIZE
;
3931 if (ext4_has_feature_extra_isize(sb
)) {
3932 unsigned v
, max
= (sbi
->s_inode_size
-
3933 EXT4_GOOD_OLD_INODE_SIZE
);
3935 v
= le16_to_cpu(es
->s_want_extra_isize
);
3937 ext4_msg(sb
, KERN_ERR
,
3938 "bad s_want_extra_isize: %d", v
);
3941 if (sbi
->s_want_extra_isize
< v
)
3942 sbi
->s_want_extra_isize
= v
;
3944 v
= le16_to_cpu(es
->s_min_extra_isize
);
3946 ext4_msg(sb
, KERN_ERR
,
3947 "bad s_min_extra_isize: %d", v
);
3950 if (sbi
->s_want_extra_isize
< v
)
3951 sbi
->s_want_extra_isize
= v
;
3955 if (sbi
->s_es
->s_mount_opts
[0]) {
3956 char *s_mount_opts
= kstrndup(sbi
->s_es
->s_mount_opts
,
3957 sizeof(sbi
->s_es
->s_mount_opts
),
3961 if (!parse_options(s_mount_opts
, sb
, &journal_devnum
,
3962 &journal_ioprio
, 0)) {
3963 ext4_msg(sb
, KERN_WARNING
,
3964 "failed to parse options in superblock: %s",
3967 kfree(s_mount_opts
);
3969 sbi
->s_def_mount_opt
= sbi
->s_mount_opt
;
3970 if (!parse_options((char *) data
, sb
, &journal_devnum
,
3971 &journal_ioprio
, 0))
3974 #ifdef CONFIG_UNICODE
3975 if (ext4_has_feature_casefold(sb
) && !sbi
->s_encoding
) {
3976 const struct ext4_sb_encodings
*encoding_info
;
3977 struct unicode_map
*encoding
;
3978 __u16 encoding_flags
;
3980 if (ext4_has_feature_encrypt(sb
)) {
3981 ext4_msg(sb
, KERN_ERR
,
3982 "Can't mount with encoding and encryption");
3986 if (ext4_sb_read_encoding(es
, &encoding_info
,
3988 ext4_msg(sb
, KERN_ERR
,
3989 "Encoding requested by superblock is unknown");
3993 encoding
= utf8_load(encoding_info
->version
);
3994 if (IS_ERR(encoding
)) {
3995 ext4_msg(sb
, KERN_ERR
,
3996 "can't mount with superblock charset: %s-%s "
3997 "not supported by the kernel. flags: 0x%x.",
3998 encoding_info
->name
, encoding_info
->version
,
4002 ext4_msg(sb
, KERN_INFO
,"Using encoding defined by superblock: "
4003 "%s-%s with flags 0x%hx", encoding_info
->name
,
4004 encoding_info
->version
?:"\b", encoding_flags
);
4006 sbi
->s_encoding
= encoding
;
4007 sbi
->s_encoding_flags
= encoding_flags
;
4011 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
4012 printk_once(KERN_WARNING
"EXT4-fs: Warning: mounting with data=journal disables delayed allocation, dioread_nolock, and O_DIRECT support!\n");
4013 clear_opt(sb
, DIOREAD_NOLOCK
);
4014 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
4015 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4016 "both data=journal and delalloc");
4019 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
4020 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4021 "both data=journal and dioread_nolock");
4024 if (test_opt(sb
, DAX
)) {
4025 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4026 "both data=journal and dax");
4029 if (ext4_has_feature_encrypt(sb
)) {
4030 ext4_msg(sb
, KERN_WARNING
,
4031 "encrypted files will use data=ordered "
4032 "instead of data journaling mode");
4034 if (test_opt(sb
, DELALLOC
))
4035 clear_opt(sb
, DELALLOC
);
4037 sb
->s_iflags
|= SB_I_CGROUPWB
;
4040 sb
->s_flags
= (sb
->s_flags
& ~SB_POSIXACL
) |
4041 (test_opt(sb
, POSIX_ACL
) ? SB_POSIXACL
: 0);
4043 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
4044 (ext4_has_compat_features(sb
) ||
4045 ext4_has_ro_compat_features(sb
) ||
4046 ext4_has_incompat_features(sb
)))
4047 ext4_msg(sb
, KERN_WARNING
,
4048 "feature flags set on rev 0 fs, "
4049 "running e2fsck is recommended");
4051 if (es
->s_creator_os
== cpu_to_le32(EXT4_OS_HURD
)) {
4052 set_opt2(sb
, HURD_COMPAT
);
4053 if (ext4_has_feature_64bit(sb
)) {
4054 ext4_msg(sb
, KERN_ERR
,
4055 "The Hurd can't support 64-bit file systems");
4060 * ea_inode feature uses l_i_version field which is not
4061 * available in HURD_COMPAT mode.
4063 if (ext4_has_feature_ea_inode(sb
)) {
4064 ext4_msg(sb
, KERN_ERR
,
4065 "ea_inode feature is not supported for Hurd");
4070 if (IS_EXT2_SB(sb
)) {
4071 if (ext2_feature_set_ok(sb
))
4072 ext4_msg(sb
, KERN_INFO
, "mounting ext2 file system "
4073 "using the ext4 subsystem");
4076 * If we're probing be silent, if this looks like
4077 * it's actually an ext[34] filesystem.
4079 if (silent
&& ext4_feature_set_ok(sb
, sb_rdonly(sb
)))
4081 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext2 due "
4082 "to feature incompatibilities");
4087 if (IS_EXT3_SB(sb
)) {
4088 if (ext3_feature_set_ok(sb
))
4089 ext4_msg(sb
, KERN_INFO
, "mounting ext3 file system "
4090 "using the ext4 subsystem");
4093 * If we're probing be silent, if this looks like
4094 * it's actually an ext4 filesystem.
4096 if (silent
&& ext4_feature_set_ok(sb
, sb_rdonly(sb
)))
4098 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext3 due "
4099 "to feature incompatibilities");
4105 * Check feature flags regardless of the revision level, since we
4106 * previously didn't change the revision level when setting the flags,
4107 * so there is a chance incompat flags are set on a rev 0 filesystem.
4109 if (!ext4_feature_set_ok(sb
, (sb_rdonly(sb
))))
4112 if (le32_to_cpu(es
->s_log_block_size
) >
4113 (EXT4_MAX_BLOCK_LOG_SIZE
- EXT4_MIN_BLOCK_LOG_SIZE
)) {
4114 ext4_msg(sb
, KERN_ERR
,
4115 "Invalid log block size: %u",
4116 le32_to_cpu(es
->s_log_block_size
));
4119 if (le32_to_cpu(es
->s_log_cluster_size
) >
4120 (EXT4_MAX_CLUSTER_LOG_SIZE
- EXT4_MIN_BLOCK_LOG_SIZE
)) {
4121 ext4_msg(sb
, KERN_ERR
,
4122 "Invalid log cluster size: %u",
4123 le32_to_cpu(es
->s_log_cluster_size
));
4127 if (le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
) > (blocksize
/ 4)) {
4128 ext4_msg(sb
, KERN_ERR
,
4129 "Number of reserved GDT blocks insanely large: %d",
4130 le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
));
4134 if (sbi
->s_mount_opt
& EXT4_MOUNT_DAX
) {
4135 if (ext4_has_feature_inline_data(sb
)) {
4136 ext4_msg(sb
, KERN_ERR
, "Cannot use DAX on a filesystem"
4137 " that may contain inline data");
4140 if (!bdev_dax_supported(sb
->s_bdev
, blocksize
)) {
4141 ext4_msg(sb
, KERN_ERR
,
4142 "DAX unsupported by block device.");
4147 if (ext4_has_feature_encrypt(sb
) && es
->s_encryption_level
) {
4148 ext4_msg(sb
, KERN_ERR
, "Unsupported encryption level %d",
4149 es
->s_encryption_level
);
4153 if (sb
->s_blocksize
!= blocksize
) {
4154 /* Validate the filesystem blocksize */
4155 if (!sb_set_blocksize(sb
, blocksize
)) {
4156 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
4162 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
4163 offset
= do_div(logical_sb_block
, blocksize
);
4164 bh
= sb_bread_unmovable(sb
, logical_sb_block
);
4166 ext4_msg(sb
, KERN_ERR
,
4167 "Can't read superblock on 2nd try");
4170 es
= (struct ext4_super_block
*)(bh
->b_data
+ offset
);
4172 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
4173 ext4_msg(sb
, KERN_ERR
,
4174 "Magic mismatch, very weird!");
4179 has_huge_files
= ext4_has_feature_huge_file(sb
);
4180 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
4182 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
4184 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
4185 if (ext4_has_feature_64bit(sb
)) {
4186 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
4187 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
4188 !is_power_of_2(sbi
->s_desc_size
)) {
4189 ext4_msg(sb
, KERN_ERR
,
4190 "unsupported descriptor size %lu",
4195 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
4197 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
4198 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
4200 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
4201 if (sbi
->s_inodes_per_block
== 0)
4203 if (sbi
->s_inodes_per_group
< sbi
->s_inodes_per_block
||
4204 sbi
->s_inodes_per_group
> blocksize
* 8) {
4205 ext4_msg(sb
, KERN_ERR
, "invalid inodes per group: %lu\n",
4206 sbi
->s_inodes_per_group
);
4209 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
4210 sbi
->s_inodes_per_block
;
4211 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
4213 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
4214 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
4215 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
4217 for (i
= 0; i
< 4; i
++)
4218 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
4219 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
4220 if (ext4_has_feature_dir_index(sb
)) {
4221 i
= le32_to_cpu(es
->s_flags
);
4222 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
4223 sbi
->s_hash_unsigned
= 3;
4224 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
4225 #ifdef __CHAR_UNSIGNED__
4228 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
4229 sbi
->s_hash_unsigned
= 3;
4233 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
4238 /* Handle clustersize */
4239 clustersize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_cluster_size
);
4240 has_bigalloc
= ext4_has_feature_bigalloc(sb
);
4242 if (clustersize
< blocksize
) {
4243 ext4_msg(sb
, KERN_ERR
,
4244 "cluster size (%d) smaller than "
4245 "block size (%d)", clustersize
, blocksize
);
4248 sbi
->s_cluster_bits
= le32_to_cpu(es
->s_log_cluster_size
) -
4249 le32_to_cpu(es
->s_log_block_size
);
4250 sbi
->s_clusters_per_group
=
4251 le32_to_cpu(es
->s_clusters_per_group
);
4252 if (sbi
->s_clusters_per_group
> blocksize
* 8) {
4253 ext4_msg(sb
, KERN_ERR
,
4254 "#clusters per group too big: %lu",
4255 sbi
->s_clusters_per_group
);
4258 if (sbi
->s_blocks_per_group
!=
4259 (sbi
->s_clusters_per_group
* (clustersize
/ blocksize
))) {
4260 ext4_msg(sb
, KERN_ERR
, "blocks per group (%lu) and "
4261 "clusters per group (%lu) inconsistent",
4262 sbi
->s_blocks_per_group
,
4263 sbi
->s_clusters_per_group
);
4267 if (clustersize
!= blocksize
) {
4268 ext4_msg(sb
, KERN_ERR
,
4269 "fragment/cluster size (%d) != "
4270 "block size (%d)", clustersize
, blocksize
);
4273 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
4274 ext4_msg(sb
, KERN_ERR
,
4275 "#blocks per group too big: %lu",
4276 sbi
->s_blocks_per_group
);
4279 sbi
->s_clusters_per_group
= sbi
->s_blocks_per_group
;
4280 sbi
->s_cluster_bits
= 0;
4282 sbi
->s_cluster_ratio
= clustersize
/ blocksize
;
4284 /* Do we have standard group size of clustersize * 8 blocks ? */
4285 if (sbi
->s_blocks_per_group
== clustersize
<< 3)
4286 set_opt2(sb
, STD_GROUP_SIZE
);
4289 * Test whether we have more sectors than will fit in sector_t,
4290 * and whether the max offset is addressable by the page cache.
4292 err
= generic_check_addressable(sb
->s_blocksize_bits
,
4293 ext4_blocks_count(es
));
4295 ext4_msg(sb
, KERN_ERR
, "filesystem"
4296 " too large to mount safely on this system");
4300 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
4303 /* check blocks count against device size */
4304 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
4305 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
4306 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
4307 "exceeds size of device (%llu blocks)",
4308 ext4_blocks_count(es
), blocks_count
);
4313 * It makes no sense for the first data block to be beyond the end
4314 * of the filesystem.
4316 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
4317 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data "
4318 "block %u is beyond end of filesystem (%llu)",
4319 le32_to_cpu(es
->s_first_data_block
),
4320 ext4_blocks_count(es
));
4323 if ((es
->s_first_data_block
== 0) && (es
->s_log_block_size
== 0) &&
4324 (sbi
->s_cluster_ratio
== 1)) {
4325 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data "
4326 "block is 0 with a 1k block and cluster size");
4330 blocks_count
= (ext4_blocks_count(es
) -
4331 le32_to_cpu(es
->s_first_data_block
) +
4332 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
4333 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
4334 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
4335 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %llu "
4336 "(block count %llu, first data block %u, "
4337 "blocks per group %lu)", blocks_count
,
4338 ext4_blocks_count(es
),
4339 le32_to_cpu(es
->s_first_data_block
),
4340 EXT4_BLOCKS_PER_GROUP(sb
));
4343 sbi
->s_groups_count
= blocks_count
;
4344 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
4345 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
4346 if (((u64
)sbi
->s_groups_count
* sbi
->s_inodes_per_group
) !=
4347 le32_to_cpu(es
->s_inodes_count
)) {
4348 ext4_msg(sb
, KERN_ERR
, "inodes count not valid: %u vs %llu",
4349 le32_to_cpu(es
->s_inodes_count
),
4350 ((u64
)sbi
->s_groups_count
* sbi
->s_inodes_per_group
));
4354 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
4355 EXT4_DESC_PER_BLOCK(sb
);
4356 if (ext4_has_feature_meta_bg(sb
)) {
4357 if (le32_to_cpu(es
->s_first_meta_bg
) > db_count
) {
4358 ext4_msg(sb
, KERN_WARNING
,
4359 "first meta block group too large: %u "
4360 "(group descriptor block count %u)",
4361 le32_to_cpu(es
->s_first_meta_bg
), db_count
);
4365 rcu_assign_pointer(sbi
->s_group_desc
,
4366 kvmalloc_array(db_count
,
4367 sizeof(struct buffer_head
*),
4369 if (sbi
->s_group_desc
== NULL
) {
4370 ext4_msg(sb
, KERN_ERR
, "not enough memory");
4375 bgl_lock_init(sbi
->s_blockgroup_lock
);
4377 /* Pre-read the descriptors into the buffer cache */
4378 for (i
= 0; i
< db_count
; i
++) {
4379 block
= descriptor_loc(sb
, logical_sb_block
, i
);
4380 sb_breadahead_unmovable(sb
, block
);
4383 for (i
= 0; i
< db_count
; i
++) {
4384 struct buffer_head
*bh
;
4386 block
= descriptor_loc(sb
, logical_sb_block
, i
);
4387 bh
= sb_bread_unmovable(sb
, block
);
4389 ext4_msg(sb
, KERN_ERR
,
4390 "can't read group descriptor %d", i
);
4395 rcu_dereference(sbi
->s_group_desc
)[i
] = bh
;
4398 sbi
->s_gdb_count
= db_count
;
4399 if (!ext4_check_descriptors(sb
, logical_sb_block
, &first_not_zeroed
)) {
4400 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
4401 ret
= -EFSCORRUPTED
;
4405 timer_setup(&sbi
->s_err_report
, print_daily_error_info
, 0);
4407 /* Register extent status tree shrinker */
4408 if (ext4_es_register_shrinker(sbi
))
4411 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
4412 sbi
->s_extent_max_zeroout_kb
= 32;
4415 * set up enough so that it can read an inode
4417 sb
->s_op
= &ext4_sops
;
4418 sb
->s_export_op
= &ext4_export_ops
;
4419 sb
->s_xattr
= ext4_xattr_handlers
;
4420 #ifdef CONFIG_FS_ENCRYPTION
4421 sb
->s_cop
= &ext4_cryptops
;
4423 #ifdef CONFIG_FS_VERITY
4424 sb
->s_vop
= &ext4_verityops
;
4427 sb
->dq_op
= &ext4_quota_operations
;
4428 if (ext4_has_feature_quota(sb
))
4429 sb
->s_qcop
= &dquot_quotactl_sysfile_ops
;
4431 sb
->s_qcop
= &ext4_qctl_operations
;
4432 sb
->s_quota_types
= QTYPE_MASK_USR
| QTYPE_MASK_GRP
| QTYPE_MASK_PRJ
;
4434 memcpy(&sb
->s_uuid
, es
->s_uuid
, sizeof(es
->s_uuid
));
4436 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
4437 mutex_init(&sbi
->s_orphan_lock
);
4441 needs_recovery
= (es
->s_last_orphan
!= 0 ||
4442 ext4_has_feature_journal_needs_recovery(sb
));
4444 if (ext4_has_feature_mmp(sb
) && !sb_rdonly(sb
))
4445 if (ext4_multi_mount_protect(sb
, le64_to_cpu(es
->s_mmp_block
)))
4446 goto failed_mount3a
;
4449 * The first inode we look at is the journal inode. Don't try
4450 * root first: it may be modified in the journal!
4452 if (!test_opt(sb
, NOLOAD
) && ext4_has_feature_journal(sb
)) {
4453 err
= ext4_load_journal(sb
, es
, journal_devnum
);
4455 goto failed_mount3a
;
4456 } else if (test_opt(sb
, NOLOAD
) && !sb_rdonly(sb
) &&
4457 ext4_has_feature_journal_needs_recovery(sb
)) {
4458 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
4459 "suppressed and not mounted read-only");
4460 goto failed_mount_wq
;
4462 /* Nojournal mode, all journal mount options are illegal */
4463 if (test_opt2(sb
, EXPLICIT_JOURNAL_CHECKSUM
)) {
4464 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4465 "journal_checksum, fs mounted w/o journal");
4466 goto failed_mount_wq
;
4468 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
4469 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4470 "journal_async_commit, fs mounted w/o journal");
4471 goto failed_mount_wq
;
4473 if (sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
) {
4474 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4475 "commit=%lu, fs mounted w/o journal",
4476 sbi
->s_commit_interval
/ HZ
);
4477 goto failed_mount_wq
;
4479 if (EXT4_MOUNT_DATA_FLAGS
&
4480 (sbi
->s_mount_opt
^ sbi
->s_def_mount_opt
)) {
4481 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4482 "data=, fs mounted w/o journal");
4483 goto failed_mount_wq
;
4485 sbi
->s_def_mount_opt
&= ~EXT4_MOUNT_JOURNAL_CHECKSUM
;
4486 clear_opt(sb
, JOURNAL_CHECKSUM
);
4487 clear_opt(sb
, DATA_FLAGS
);
4488 sbi
->s_journal
= NULL
;
4493 if (ext4_has_feature_64bit(sb
) &&
4494 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
4495 JBD2_FEATURE_INCOMPAT_64BIT
)) {
4496 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
4497 goto failed_mount_wq
;
4500 if (!set_journal_csum_feature_set(sb
)) {
4501 ext4_msg(sb
, KERN_ERR
, "Failed to set journal checksum "
4503 goto failed_mount_wq
;
4506 /* We have now updated the journal if required, so we can
4507 * validate the data journaling mode. */
4508 switch (test_opt(sb
, DATA_FLAGS
)) {
4510 /* No mode set, assume a default based on the journal
4511 * capabilities: ORDERED_DATA if the journal can
4512 * cope, else JOURNAL_DATA
4514 if (jbd2_journal_check_available_features
4515 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
4516 set_opt(sb
, ORDERED_DATA
);
4517 sbi
->s_def_mount_opt
|= EXT4_MOUNT_ORDERED_DATA
;
4519 set_opt(sb
, JOURNAL_DATA
);
4520 sbi
->s_def_mount_opt
|= EXT4_MOUNT_JOURNAL_DATA
;
4524 case EXT4_MOUNT_ORDERED_DATA
:
4525 case EXT4_MOUNT_WRITEBACK_DATA
:
4526 if (!jbd2_journal_check_available_features
4527 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
4528 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
4529 "requested data journaling mode");
4530 goto failed_mount_wq
;
4536 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
&&
4537 test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
4538 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4539 "journal_async_commit in data=ordered mode");
4540 goto failed_mount_wq
;
4543 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
4545 sbi
->s_journal
->j_commit_callback
= ext4_journal_commit_callback
;
4548 if (!test_opt(sb
, NO_MBCACHE
)) {
4549 sbi
->s_ea_block_cache
= ext4_xattr_create_cache();
4550 if (!sbi
->s_ea_block_cache
) {
4551 ext4_msg(sb
, KERN_ERR
,
4552 "Failed to create ea_block_cache");
4553 goto failed_mount_wq
;
4556 if (ext4_has_feature_ea_inode(sb
)) {
4557 sbi
->s_ea_inode_cache
= ext4_xattr_create_cache();
4558 if (!sbi
->s_ea_inode_cache
) {
4559 ext4_msg(sb
, KERN_ERR
,
4560 "Failed to create ea_inode_cache");
4561 goto failed_mount_wq
;
4566 if (ext4_has_feature_verity(sb
) && blocksize
!= PAGE_SIZE
) {
4567 ext4_msg(sb
, KERN_ERR
, "Unsupported blocksize for fs-verity");
4568 goto failed_mount_wq
;
4571 if (DUMMY_ENCRYPTION_ENABLED(sbi
) && !sb_rdonly(sb
) &&
4572 !ext4_has_feature_encrypt(sb
)) {
4573 ext4_set_feature_encrypt(sb
);
4574 ext4_commit_super(sb
, 1);
4578 * Get the # of file system overhead blocks from the
4579 * superblock if present.
4581 if (es
->s_overhead_clusters
)
4582 sbi
->s_overhead
= le32_to_cpu(es
->s_overhead_clusters
);
4584 err
= ext4_calculate_overhead(sb
);
4586 goto failed_mount_wq
;
4590 * The maximum number of concurrent works can be high and
4591 * concurrency isn't really necessary. Limit it to 1.
4593 EXT4_SB(sb
)->rsv_conversion_wq
=
4594 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM
| WQ_UNBOUND
, 1);
4595 if (!EXT4_SB(sb
)->rsv_conversion_wq
) {
4596 printk(KERN_ERR
"EXT4-fs: failed to create workqueue\n");
4602 * The jbd2_journal_load will have done any necessary log recovery,
4603 * so we can safely mount the rest of the filesystem now.
4606 root
= ext4_iget(sb
, EXT4_ROOT_INO
, EXT4_IGET_SPECIAL
);
4608 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
4609 ret
= PTR_ERR(root
);
4613 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
4614 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
4619 #ifdef CONFIG_UNICODE
4620 if (sbi
->s_encoding
)
4621 sb
->s_d_op
= &ext4_dentry_ops
;
4624 sb
->s_root
= d_make_root(root
);
4626 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
4631 ret
= ext4_setup_super(sb
, es
, sb_rdonly(sb
));
4632 if (ret
== -EROFS
) {
4633 sb
->s_flags
|= SB_RDONLY
;
4636 goto failed_mount4a
;
4638 ext4_set_resv_clusters(sb
);
4640 err
= ext4_setup_system_zone(sb
);
4642 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
4644 goto failed_mount4a
;
4648 err
= ext4_mb_init(sb
);
4650 ext4_msg(sb
, KERN_ERR
, "failed to initialize mballoc (%d)",
4655 block
= ext4_count_free_clusters(sb
);
4656 ext4_free_blocks_count_set(sbi
->s_es
,
4657 EXT4_C2B(sbi
, block
));
4658 ext4_superblock_csum_set(sb
);
4659 err
= percpu_counter_init(&sbi
->s_freeclusters_counter
, block
,
4662 unsigned long freei
= ext4_count_free_inodes(sb
);
4663 sbi
->s_es
->s_free_inodes_count
= cpu_to_le32(freei
);
4664 ext4_superblock_csum_set(sb
);
4665 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
, freei
,
4669 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
4670 ext4_count_dirs(sb
), GFP_KERNEL
);
4672 err
= percpu_counter_init(&sbi
->s_dirtyclusters_counter
, 0,
4675 err
= percpu_init_rwsem(&sbi
->s_writepages_rwsem
);
4678 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
4682 if (ext4_has_feature_flex_bg(sb
))
4683 if (!ext4_fill_flex_info(sb
)) {
4684 ext4_msg(sb
, KERN_ERR
,
4685 "unable to initialize "
4686 "flex_bg meta info!");
4690 err
= ext4_register_li_request(sb
, first_not_zeroed
);
4694 err
= ext4_register_sysfs(sb
);
4699 /* Enable quota usage during mount. */
4700 if (ext4_has_feature_quota(sb
) && !sb_rdonly(sb
)) {
4701 err
= ext4_enable_quotas(sb
);
4705 #endif /* CONFIG_QUOTA */
4707 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
4708 ext4_orphan_cleanup(sb
, es
);
4709 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
4710 if (needs_recovery
) {
4711 ext4_msg(sb
, KERN_INFO
, "recovery complete");
4712 ext4_mark_recovery_complete(sb
, es
);
4714 if (EXT4_SB(sb
)->s_journal
) {
4715 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
4716 descr
= " journalled data mode";
4717 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
4718 descr
= " ordered data mode";
4720 descr
= " writeback data mode";
4722 descr
= "out journal";
4724 if (test_opt(sb
, DISCARD
)) {
4725 struct request_queue
*q
= bdev_get_queue(sb
->s_bdev
);
4726 if (!blk_queue_discard(q
))
4727 ext4_msg(sb
, KERN_WARNING
,
4728 "mounting with \"discard\" option, but "
4729 "the device does not support discard");
4732 if (___ratelimit(&ext4_mount_msg_ratelimit
, "EXT4-fs mount"))
4733 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s. "
4734 "Opts: %.*s%s%s", descr
,
4735 (int) sizeof(sbi
->s_es
->s_mount_opts
),
4736 sbi
->s_es
->s_mount_opts
,
4737 *sbi
->s_es
->s_mount_opts
? "; " : "", orig_data
);
4739 if (es
->s_error_count
)
4740 mod_timer(&sbi
->s_err_report
, jiffies
+ 300*HZ
); /* 5 minutes */
4742 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4743 ratelimit_state_init(&sbi
->s_err_ratelimit_state
, 5 * HZ
, 10);
4744 ratelimit_state_init(&sbi
->s_warning_ratelimit_state
, 5 * HZ
, 10);
4745 ratelimit_state_init(&sbi
->s_msg_ratelimit_state
, 5 * HZ
, 10);
4752 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
4757 ext4_unregister_sysfs(sb
);
4760 ext4_unregister_li_request(sb
);
4762 ext4_mb_release(sb
);
4764 flex_groups
= rcu_dereference(sbi
->s_flex_groups
);
4766 for (i
= 0; i
< sbi
->s_flex_groups_allocated
; i
++)
4767 kvfree(flex_groups
[i
]);
4768 kvfree(flex_groups
);
4771 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
4772 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
4773 percpu_counter_destroy(&sbi
->s_dirs_counter
);
4774 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
4775 percpu_free_rwsem(&sbi
->s_writepages_rwsem
);
4777 ext4_ext_release(sb
);
4778 ext4_release_system_zone(sb
);
4783 ext4_msg(sb
, KERN_ERR
, "mount failed");
4784 if (EXT4_SB(sb
)->rsv_conversion_wq
)
4785 destroy_workqueue(EXT4_SB(sb
)->rsv_conversion_wq
);
4787 ext4_xattr_destroy_cache(sbi
->s_ea_inode_cache
);
4788 sbi
->s_ea_inode_cache
= NULL
;
4790 ext4_xattr_destroy_cache(sbi
->s_ea_block_cache
);
4791 sbi
->s_ea_block_cache
= NULL
;
4793 if (sbi
->s_journal
) {
4794 jbd2_journal_destroy(sbi
->s_journal
);
4795 sbi
->s_journal
= NULL
;
4798 ext4_es_unregister_shrinker(sbi
);
4800 del_timer_sync(&sbi
->s_err_report
);
4802 kthread_stop(sbi
->s_mmp_tsk
);
4805 group_desc
= rcu_dereference(sbi
->s_group_desc
);
4806 for (i
= 0; i
< db_count
; i
++)
4807 brelse(group_desc
[i
]);
4811 if (sbi
->s_chksum_driver
)
4812 crypto_free_shash(sbi
->s_chksum_driver
);
4814 #ifdef CONFIG_UNICODE
4815 utf8_unload(sbi
->s_encoding
);
4819 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
4820 kfree(get_qf_name(sb
, sbi
, i
));
4822 fscrypt_free_dummy_context(&sbi
->s_dummy_enc_ctx
);
4823 ext4_blkdev_remove(sbi
);
4826 sb
->s_fs_info
= NULL
;
4827 kfree(sbi
->s_blockgroup_lock
);
4831 fs_put_dax(dax_dev
);
4832 return err
? err
: ret
;
4836 * Setup any per-fs journal parameters now. We'll do this both on
4837 * initial mount, once the journal has been initialised but before we've
4838 * done any recovery; and again on any subsequent remount.
4840 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
4842 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
4844 journal
->j_commit_interval
= sbi
->s_commit_interval
;
4845 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
4846 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
4848 write_lock(&journal
->j_state_lock
);
4849 if (test_opt(sb
, BARRIER
))
4850 journal
->j_flags
|= JBD2_BARRIER
;
4852 journal
->j_flags
&= ~JBD2_BARRIER
;
4853 if (test_opt(sb
, DATA_ERR_ABORT
))
4854 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
4856 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
4857 write_unlock(&journal
->j_state_lock
);
4860 static struct inode
*ext4_get_journal_inode(struct super_block
*sb
,
4861 unsigned int journal_inum
)
4863 struct inode
*journal_inode
;
4866 * Test for the existence of a valid inode on disk. Bad things
4867 * happen if we iget() an unused inode, as the subsequent iput()
4868 * will try to delete it.
4870 journal_inode
= ext4_iget(sb
, journal_inum
, EXT4_IGET_SPECIAL
);
4871 if (IS_ERR(journal_inode
)) {
4872 ext4_msg(sb
, KERN_ERR
, "no journal found");
4875 if (!journal_inode
->i_nlink
) {
4876 make_bad_inode(journal_inode
);
4877 iput(journal_inode
);
4878 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
4882 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4883 journal_inode
, journal_inode
->i_size
);
4884 if (!S_ISREG(journal_inode
->i_mode
)) {
4885 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
4886 iput(journal_inode
);
4889 return journal_inode
;
4892 static journal_t
*ext4_get_journal(struct super_block
*sb
,
4893 unsigned int journal_inum
)
4895 struct inode
*journal_inode
;
4898 BUG_ON(!ext4_has_feature_journal(sb
));
4900 journal_inode
= ext4_get_journal_inode(sb
, journal_inum
);
4904 journal
= jbd2_journal_init_inode(journal_inode
);
4906 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
4907 iput(journal_inode
);
4910 journal
->j_private
= sb
;
4911 ext4_init_journal_params(sb
, journal
);
4915 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
4918 struct buffer_head
*bh
;
4922 int hblock
, blocksize
;
4923 ext4_fsblk_t sb_block
;
4924 unsigned long offset
;
4925 struct ext4_super_block
*es
;
4926 struct block_device
*bdev
;
4928 BUG_ON(!ext4_has_feature_journal(sb
));
4930 bdev
= ext4_blkdev_get(j_dev
, sb
);
4934 blocksize
= sb
->s_blocksize
;
4935 hblock
= bdev_logical_block_size(bdev
);
4936 if (blocksize
< hblock
) {
4937 ext4_msg(sb
, KERN_ERR
,
4938 "blocksize too small for journal device");
4942 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
4943 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
4944 set_blocksize(bdev
, blocksize
);
4945 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
4946 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
4947 "external journal");
4951 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
4952 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
4953 !(le32_to_cpu(es
->s_feature_incompat
) &
4954 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
4955 ext4_msg(sb
, KERN_ERR
, "external journal has "
4961 if ((le32_to_cpu(es
->s_feature_ro_compat
) &
4962 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
) &&
4963 es
->s_checksum
!= ext4_superblock_csum(sb
, es
)) {
4964 ext4_msg(sb
, KERN_ERR
, "external journal has "
4965 "corrupt superblock");
4970 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
4971 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
4976 len
= ext4_blocks_count(es
);
4977 start
= sb_block
+ 1;
4978 brelse(bh
); /* we're done with the superblock */
4980 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
4981 start
, len
, blocksize
);
4983 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
4986 journal
->j_private
= sb
;
4987 ll_rw_block(REQ_OP_READ
, REQ_META
| REQ_PRIO
, 1, &journal
->j_sb_buffer
);
4988 wait_on_buffer(journal
->j_sb_buffer
);
4989 if (!buffer_uptodate(journal
->j_sb_buffer
)) {
4990 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
4993 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
4994 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
4995 "user (unsupported) - %d",
4996 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
4999 EXT4_SB(sb
)->journal_bdev
= bdev
;
5000 ext4_init_journal_params(sb
, journal
);
5004 jbd2_journal_destroy(journal
);
5006 ext4_blkdev_put(bdev
);
5010 static int ext4_load_journal(struct super_block
*sb
,
5011 struct ext4_super_block
*es
,
5012 unsigned long journal_devnum
)
5015 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
5018 int really_read_only
;
5020 BUG_ON(!ext4_has_feature_journal(sb
));
5022 if (journal_devnum
&&
5023 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
5024 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
5025 "numbers have changed");
5026 journal_dev
= new_decode_dev(journal_devnum
);
5028 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
5030 really_read_only
= bdev_read_only(sb
->s_bdev
);
5033 * Are we loading a blank journal or performing recovery after a
5034 * crash? For recovery, we need to check in advance whether we
5035 * can get read-write access to the device.
5037 if (ext4_has_feature_journal_needs_recovery(sb
)) {
5038 if (sb_rdonly(sb
)) {
5039 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
5040 "required on readonly filesystem");
5041 if (really_read_only
) {
5042 ext4_msg(sb
, KERN_ERR
, "write access "
5043 "unavailable, cannot proceed "
5044 "(try mounting with noload)");
5047 ext4_msg(sb
, KERN_INFO
, "write access will "
5048 "be enabled during recovery");
5052 if (journal_inum
&& journal_dev
) {
5053 ext4_msg(sb
, KERN_ERR
, "filesystem has both journal "
5054 "and inode journals!");
5059 if (!(journal
= ext4_get_journal(sb
, journal_inum
)))
5062 if (!(journal
= ext4_get_dev_journal(sb
, journal_dev
)))
5066 if (!(journal
->j_flags
& JBD2_BARRIER
))
5067 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
5069 if (!ext4_has_feature_journal_needs_recovery(sb
))
5070 err
= jbd2_journal_wipe(journal
, !really_read_only
);
5072 char *save
= kmalloc(EXT4_S_ERR_LEN
, GFP_KERNEL
);
5074 memcpy(save
, ((char *) es
) +
5075 EXT4_S_ERR_START
, EXT4_S_ERR_LEN
);
5076 err
= jbd2_journal_load(journal
);
5078 memcpy(((char *) es
) + EXT4_S_ERR_START
,
5079 save
, EXT4_S_ERR_LEN
);
5084 ext4_msg(sb
, KERN_ERR
, "error loading journal");
5085 jbd2_journal_destroy(journal
);
5089 EXT4_SB(sb
)->s_journal
= journal
;
5090 ext4_clear_journal_err(sb
, es
);
5092 if (!really_read_only
&& journal_devnum
&&
5093 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
5094 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
5096 /* Make sure we flush the recovery flag to disk. */
5097 ext4_commit_super(sb
, 1);
5103 static int ext4_commit_super(struct super_block
*sb
, int sync
)
5105 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
5106 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
5109 if (!sbh
|| block_device_ejected(sb
))
5113 * The superblock bh should be mapped, but it might not be if the
5114 * device was hot-removed. Not much we can do but fail the I/O.
5116 if (!buffer_mapped(sbh
))
5120 * If the file system is mounted read-only, don't update the
5121 * superblock write time. This avoids updating the superblock
5122 * write time when we are mounting the root file system
5123 * read/only but we need to replay the journal; at that point,
5124 * for people who are east of GMT and who make their clock
5125 * tick in localtime for Windows bug-for-bug compatibility,
5126 * the clock is set in the future, and this will cause e2fsck
5127 * to complain and force a full file system check.
5129 if (!(sb
->s_flags
& SB_RDONLY
))
5130 ext4_update_tstamp(es
, s_wtime
);
5131 if (sb
->s_bdev
->bd_part
)
5132 es
->s_kbytes_written
=
5133 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
+
5134 ((part_stat_read(sb
->s_bdev
->bd_part
,
5135 sectors
[STAT_WRITE
]) -
5136 EXT4_SB(sb
)->s_sectors_written_start
) >> 1));
5138 es
->s_kbytes_written
=
5139 cpu_to_le64(EXT4_SB(sb
)->s_kbytes_written
);
5140 if (percpu_counter_initialized(&EXT4_SB(sb
)->s_freeclusters_counter
))
5141 ext4_free_blocks_count_set(es
,
5142 EXT4_C2B(EXT4_SB(sb
), percpu_counter_sum_positive(
5143 &EXT4_SB(sb
)->s_freeclusters_counter
)));
5144 if (percpu_counter_initialized(&EXT4_SB(sb
)->s_freeinodes_counter
))
5145 es
->s_free_inodes_count
=
5146 cpu_to_le32(percpu_counter_sum_positive(
5147 &EXT4_SB(sb
)->s_freeinodes_counter
));
5148 BUFFER_TRACE(sbh
, "marking dirty");
5149 ext4_superblock_csum_set(sb
);
5152 if (buffer_write_io_error(sbh
) || !buffer_uptodate(sbh
)) {
5154 * Oh, dear. A previous attempt to write the
5155 * superblock failed. This could happen because the
5156 * USB device was yanked out. Or it could happen to
5157 * be a transient write error and maybe the block will
5158 * be remapped. Nothing we can do but to retry the
5159 * write and hope for the best.
5161 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
5162 "superblock detected");
5163 clear_buffer_write_io_error(sbh
);
5164 set_buffer_uptodate(sbh
);
5166 mark_buffer_dirty(sbh
);
5169 error
= __sync_dirty_buffer(sbh
,
5170 REQ_SYNC
| (test_opt(sb
, BARRIER
) ? REQ_FUA
: 0));
5171 if (buffer_write_io_error(sbh
)) {
5172 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
5174 clear_buffer_write_io_error(sbh
);
5175 set_buffer_uptodate(sbh
);
5182 * Have we just finished recovery? If so, and if we are mounting (or
5183 * remounting) the filesystem readonly, then we will end up with a
5184 * consistent fs on disk. Record that fact.
5186 static void ext4_mark_recovery_complete(struct super_block
*sb
,
5187 struct ext4_super_block
*es
)
5189 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
5191 if (!ext4_has_feature_journal(sb
)) {
5192 BUG_ON(journal
!= NULL
);
5195 jbd2_journal_lock_updates(journal
);
5196 if (jbd2_journal_flush(journal
) < 0)
5199 if (ext4_has_feature_journal_needs_recovery(sb
) && sb_rdonly(sb
)) {
5200 ext4_clear_feature_journal_needs_recovery(sb
);
5201 ext4_commit_super(sb
, 1);
5205 jbd2_journal_unlock_updates(journal
);
5209 * If we are mounting (or read-write remounting) a filesystem whose journal
5210 * has recorded an error from a previous lifetime, move that error to the
5211 * main filesystem now.
5213 static void ext4_clear_journal_err(struct super_block
*sb
,
5214 struct ext4_super_block
*es
)
5220 BUG_ON(!ext4_has_feature_journal(sb
));
5222 journal
= EXT4_SB(sb
)->s_journal
;
5225 * Now check for any error status which may have been recorded in the
5226 * journal by a prior ext4_error() or ext4_abort()
5229 j_errno
= jbd2_journal_errno(journal
);
5233 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
5234 ext4_warning(sb
, "Filesystem error recorded "
5235 "from previous mount: %s", errstr
);
5236 ext4_warning(sb
, "Marking fs in need of filesystem check.");
5238 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
5239 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
5240 ext4_commit_super(sb
, 1);
5242 jbd2_journal_clear_err(journal
);
5243 jbd2_journal_update_sb_errno(journal
);
5248 * Force the running and committing transactions to commit,
5249 * and wait on the commit.
5251 int ext4_force_commit(struct super_block
*sb
)
5258 journal
= EXT4_SB(sb
)->s_journal
;
5259 return ext4_journal_force_commit(journal
);
5262 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
5266 bool needs_barrier
= false;
5267 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
5269 if (unlikely(ext4_forced_shutdown(sbi
)))
5272 trace_ext4_sync_fs(sb
, wait
);
5273 flush_workqueue(sbi
->rsv_conversion_wq
);
5275 * Writeback quota in non-journalled quota case - journalled quota has
5278 dquot_writeback_dquots(sb
, -1);
5280 * Data writeback is possible w/o journal transaction, so barrier must
5281 * being sent at the end of the function. But we can skip it if
5282 * transaction_commit will do it for us.
5284 if (sbi
->s_journal
) {
5285 target
= jbd2_get_latest_transaction(sbi
->s_journal
);
5286 if (wait
&& sbi
->s_journal
->j_flags
& JBD2_BARRIER
&&
5287 !jbd2_trans_will_send_data_barrier(sbi
->s_journal
, target
))
5288 needs_barrier
= true;
5290 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
5292 ret
= jbd2_log_wait_commit(sbi
->s_journal
,
5295 } else if (wait
&& test_opt(sb
, BARRIER
))
5296 needs_barrier
= true;
5297 if (needs_barrier
) {
5299 err
= blkdev_issue_flush(sb
->s_bdev
, GFP_KERNEL
);
5308 * LVM calls this function before a (read-only) snapshot is created. This
5309 * gives us a chance to flush the journal completely and mark the fs clean.
5311 * Note that only this function cannot bring a filesystem to be in a clean
5312 * state independently. It relies on upper layer to stop all data & metadata
5315 static int ext4_freeze(struct super_block
*sb
)
5323 journal
= EXT4_SB(sb
)->s_journal
;
5326 /* Now we set up the journal barrier. */
5327 jbd2_journal_lock_updates(journal
);
5330 * Don't clear the needs_recovery flag if we failed to
5331 * flush the journal.
5333 error
= jbd2_journal_flush(journal
);
5337 /* Journal blocked and flushed, clear needs_recovery flag. */
5338 ext4_clear_feature_journal_needs_recovery(sb
);
5341 error
= ext4_commit_super(sb
, 1);
5344 /* we rely on upper layer to stop further updates */
5345 jbd2_journal_unlock_updates(journal
);
5350 * Called by LVM after the snapshot is done. We need to reset the RECOVER
5351 * flag here, even though the filesystem is not technically dirty yet.
5353 static int ext4_unfreeze(struct super_block
*sb
)
5355 if (sb_rdonly(sb
) || ext4_forced_shutdown(EXT4_SB(sb
)))
5358 if (EXT4_SB(sb
)->s_journal
) {
5359 /* Reset the needs_recovery flag before the fs is unlocked. */
5360 ext4_set_feature_journal_needs_recovery(sb
);
5363 ext4_commit_super(sb
, 1);
5368 * Structure to save mount options for ext4_remount's benefit
5370 struct ext4_mount_options
{
5371 unsigned long s_mount_opt
;
5372 unsigned long s_mount_opt2
;
5375 unsigned long s_commit_interval
;
5376 u32 s_min_batch_time
, s_max_batch_time
;
5379 char *s_qf_names
[EXT4_MAXQUOTAS
];
5383 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
5385 struct ext4_super_block
*es
;
5386 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
5387 unsigned long old_sb_flags
;
5388 struct ext4_mount_options old_opts
;
5389 int enable_quota
= 0;
5391 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
5395 char *to_free
[EXT4_MAXQUOTAS
];
5397 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
5399 if (data
&& !orig_data
)
5402 /* Store the original options */
5403 old_sb_flags
= sb
->s_flags
;
5404 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
5405 old_opts
.s_mount_opt2
= sbi
->s_mount_opt2
;
5406 old_opts
.s_resuid
= sbi
->s_resuid
;
5407 old_opts
.s_resgid
= sbi
->s_resgid
;
5408 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
5409 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
5410 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
5412 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
5413 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
5414 if (sbi
->s_qf_names
[i
]) {
5415 char *qf_name
= get_qf_name(sb
, sbi
, i
);
5417 old_opts
.s_qf_names
[i
] = kstrdup(qf_name
, GFP_KERNEL
);
5418 if (!old_opts
.s_qf_names
[i
]) {
5419 for (j
= 0; j
< i
; j
++)
5420 kfree(old_opts
.s_qf_names
[j
]);
5425 old_opts
.s_qf_names
[i
] = NULL
;
5427 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
5428 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
5430 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
, 1)) {
5435 if ((old_opts
.s_mount_opt
& EXT4_MOUNT_JOURNAL_CHECKSUM
) ^
5436 test_opt(sb
, JOURNAL_CHECKSUM
)) {
5437 ext4_msg(sb
, KERN_ERR
, "changing journal_checksum "
5438 "during remount not supported; ignoring");
5439 sbi
->s_mount_opt
^= EXT4_MOUNT_JOURNAL_CHECKSUM
;
5442 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
5443 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
5444 ext4_msg(sb
, KERN_ERR
, "can't mount with "
5445 "both data=journal and delalloc");
5449 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
5450 ext4_msg(sb
, KERN_ERR
, "can't mount with "
5451 "both data=journal and dioread_nolock");
5455 if (test_opt(sb
, DAX
)) {
5456 ext4_msg(sb
, KERN_ERR
, "can't mount with "
5457 "both data=journal and dax");
5461 } else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
) {
5462 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
5463 ext4_msg(sb
, KERN_ERR
, "can't mount with "
5464 "journal_async_commit in data=ordered mode");
5470 if ((sbi
->s_mount_opt
^ old_opts
.s_mount_opt
) & EXT4_MOUNT_NO_MBCACHE
) {
5471 ext4_msg(sb
, KERN_ERR
, "can't enable nombcache during remount");
5476 if ((sbi
->s_mount_opt
^ old_opts
.s_mount_opt
) & EXT4_MOUNT_DAX
) {
5477 ext4_msg(sb
, KERN_WARNING
, "warning: refusing change of "
5478 "dax flag with busy inodes while remounting");
5479 sbi
->s_mount_opt
^= EXT4_MOUNT_DAX
;
5482 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)
5483 ext4_abort(sb
, EXT4_ERR_ESHUTDOWN
, "Abort forced by user");
5485 sb
->s_flags
= (sb
->s_flags
& ~SB_POSIXACL
) |
5486 (test_opt(sb
, POSIX_ACL
) ? SB_POSIXACL
: 0);
5490 if (sbi
->s_journal
) {
5491 ext4_init_journal_params(sb
, sbi
->s_journal
);
5492 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
5495 if (*flags
& SB_LAZYTIME
)
5496 sb
->s_flags
|= SB_LAZYTIME
;
5498 if ((bool)(*flags
& SB_RDONLY
) != sb_rdonly(sb
)) {
5499 if (sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
) {
5504 if (*flags
& SB_RDONLY
) {
5505 err
= sync_filesystem(sb
);
5508 err
= dquot_suspend(sb
, -1);
5513 * First of all, the unconditional stuff we have to do
5514 * to disable replay of the journal when we next remount
5516 sb
->s_flags
|= SB_RDONLY
;
5519 * OK, test if we are remounting a valid rw partition
5520 * readonly, and if so set the rdonly flag and then
5521 * mark the partition as valid again.
5523 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
5524 (sbi
->s_mount_state
& EXT4_VALID_FS
))
5525 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
5528 ext4_mark_recovery_complete(sb
, es
);
5530 kthread_stop(sbi
->s_mmp_tsk
);
5532 /* Make sure we can mount this feature set readwrite */
5533 if (ext4_has_feature_readonly(sb
) ||
5534 !ext4_feature_set_ok(sb
, 0)) {
5539 * Make sure the group descriptor checksums
5540 * are sane. If they aren't, refuse to remount r/w.
5542 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
5543 struct ext4_group_desc
*gdp
=
5544 ext4_get_group_desc(sb
, g
, NULL
);
5546 if (!ext4_group_desc_csum_verify(sb
, g
, gdp
)) {
5547 ext4_msg(sb
, KERN_ERR
,
5548 "ext4_remount: Checksum for group %u failed (%u!=%u)",
5549 g
, le16_to_cpu(ext4_group_desc_csum(sb
, g
, gdp
)),
5550 le16_to_cpu(gdp
->bg_checksum
));
5557 * If we have an unprocessed orphan list hanging
5558 * around from a previously readonly bdev mount,
5559 * require a full umount/remount for now.
5561 if (es
->s_last_orphan
) {
5562 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
5563 "remount RDWR because of unprocessed "
5564 "orphan inode list. Please "
5565 "umount/remount instead");
5571 * Mounting a RDONLY partition read-write, so reread
5572 * and store the current valid flag. (It may have
5573 * been changed by e2fsck since we originally mounted
5577 ext4_clear_journal_err(sb
, es
);
5578 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
5580 err
= ext4_setup_super(sb
, es
, 0);
5584 sb
->s_flags
&= ~SB_RDONLY
;
5585 if (ext4_has_feature_mmp(sb
))
5586 if (ext4_multi_mount_protect(sb
,
5587 le64_to_cpu(es
->s_mmp_block
))) {
5596 * Reinitialize lazy itable initialization thread based on
5599 if (sb_rdonly(sb
) || !test_opt(sb
, INIT_INODE_TABLE
))
5600 ext4_unregister_li_request(sb
);
5602 ext4_group_t first_not_zeroed
;
5603 first_not_zeroed
= ext4_has_uninit_itable(sb
);
5604 ext4_register_li_request(sb
, first_not_zeroed
);
5607 ext4_setup_system_zone(sb
);
5608 if (sbi
->s_journal
== NULL
&& !(old_sb_flags
& SB_RDONLY
)) {
5609 err
= ext4_commit_super(sb
, 1);
5615 /* Release old quota file names */
5616 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
5617 kfree(old_opts
.s_qf_names
[i
]);
5619 if (sb_any_quota_suspended(sb
))
5620 dquot_resume(sb
, -1);
5621 else if (ext4_has_feature_quota(sb
)) {
5622 err
= ext4_enable_quotas(sb
);
5629 *flags
= (*flags
& ~SB_LAZYTIME
) | (sb
->s_flags
& SB_LAZYTIME
);
5630 ext4_msg(sb
, KERN_INFO
, "re-mounted. Opts: %s", orig_data
);
5635 sb
->s_flags
= old_sb_flags
;
5636 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
5637 sbi
->s_mount_opt2
= old_opts
.s_mount_opt2
;
5638 sbi
->s_resuid
= old_opts
.s_resuid
;
5639 sbi
->s_resgid
= old_opts
.s_resgid
;
5640 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
5641 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
5642 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
5644 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
5645 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++) {
5646 to_free
[i
] = get_qf_name(sb
, sbi
, i
);
5647 rcu_assign_pointer(sbi
->s_qf_names
[i
], old_opts
.s_qf_names
[i
]);
5650 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
5658 static int ext4_statfs_project(struct super_block
*sb
,
5659 kprojid_t projid
, struct kstatfs
*buf
)
5662 struct dquot
*dquot
;
5666 qid
= make_kqid_projid(projid
);
5667 dquot
= dqget(sb
, qid
);
5669 return PTR_ERR(dquot
);
5670 spin_lock(&dquot
->dq_dqb_lock
);
5672 limit
= min_not_zero(dquot
->dq_dqb
.dqb_bsoftlimit
,
5673 dquot
->dq_dqb
.dqb_bhardlimit
);
5674 limit
>>= sb
->s_blocksize_bits
;
5676 if (limit
&& buf
->f_blocks
> limit
) {
5677 curblock
= (dquot
->dq_dqb
.dqb_curspace
+
5678 dquot
->dq_dqb
.dqb_rsvspace
) >> sb
->s_blocksize_bits
;
5679 buf
->f_blocks
= limit
;
5680 buf
->f_bfree
= buf
->f_bavail
=
5681 (buf
->f_blocks
> curblock
) ?
5682 (buf
->f_blocks
- curblock
) : 0;
5685 limit
= min_not_zero(dquot
->dq_dqb
.dqb_isoftlimit
,
5686 dquot
->dq_dqb
.dqb_ihardlimit
);
5687 if (limit
&& buf
->f_files
> limit
) {
5688 buf
->f_files
= limit
;
5690 (buf
->f_files
> dquot
->dq_dqb
.dqb_curinodes
) ?
5691 (buf
->f_files
- dquot
->dq_dqb
.dqb_curinodes
) : 0;
5694 spin_unlock(&dquot
->dq_dqb_lock
);
5700 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
5702 struct super_block
*sb
= dentry
->d_sb
;
5703 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
5704 struct ext4_super_block
*es
= sbi
->s_es
;
5705 ext4_fsblk_t overhead
= 0, resv_blocks
;
5708 resv_blocks
= EXT4_C2B(sbi
, atomic64_read(&sbi
->s_resv_clusters
));
5710 if (!test_opt(sb
, MINIX_DF
))
5711 overhead
= sbi
->s_overhead
;
5713 buf
->f_type
= EXT4_SUPER_MAGIC
;
5714 buf
->f_bsize
= sb
->s_blocksize
;
5715 buf
->f_blocks
= ext4_blocks_count(es
) - EXT4_C2B(sbi
, overhead
);
5716 bfree
= percpu_counter_sum_positive(&sbi
->s_freeclusters_counter
) -
5717 percpu_counter_sum_positive(&sbi
->s_dirtyclusters_counter
);
5718 /* prevent underflow in case that few free space is available */
5719 buf
->f_bfree
= EXT4_C2B(sbi
, max_t(s64
, bfree
, 0));
5720 buf
->f_bavail
= buf
->f_bfree
-
5721 (ext4_r_blocks_count(es
) + resv_blocks
);
5722 if (buf
->f_bfree
< (ext4_r_blocks_count(es
) + resv_blocks
))
5724 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
5725 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
5726 buf
->f_namelen
= EXT4_NAME_LEN
;
5727 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
5728 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
5729 buf
->f_fsid
.val
[0] = fsid
& 0xFFFFFFFFUL
;
5730 buf
->f_fsid
.val
[1] = (fsid
>> 32) & 0xFFFFFFFFUL
;
5733 if (ext4_test_inode_flag(dentry
->d_inode
, EXT4_INODE_PROJINHERIT
) &&
5734 sb_has_quota_limits_enabled(sb
, PRJQUOTA
))
5735 ext4_statfs_project(sb
, EXT4_I(dentry
->d_inode
)->i_projid
, buf
);
5744 * Helper functions so that transaction is started before we acquire dqio_sem
5745 * to keep correct lock ordering of transaction > dqio_sem
5747 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
5749 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_id
.type
];
5752 static int ext4_write_dquot(struct dquot
*dquot
)
5756 struct inode
*inode
;
5758 inode
= dquot_to_inode(dquot
);
5759 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
,
5760 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
5762 return PTR_ERR(handle
);
5763 ret
= dquot_commit(dquot
);
5764 err
= ext4_journal_stop(handle
);
5770 static int ext4_acquire_dquot(struct dquot
*dquot
)
5775 handle
= ext4_journal_start(dquot_to_inode(dquot
), EXT4_HT_QUOTA
,
5776 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
5778 return PTR_ERR(handle
);
5779 ret
= dquot_acquire(dquot
);
5780 err
= ext4_journal_stop(handle
);
5786 static int ext4_release_dquot(struct dquot
*dquot
)
5791 handle
= ext4_journal_start(dquot_to_inode(dquot
), EXT4_HT_QUOTA
,
5792 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
5793 if (IS_ERR(handle
)) {
5794 /* Release dquot anyway to avoid endless cycle in dqput() */
5795 dquot_release(dquot
);
5796 return PTR_ERR(handle
);
5798 ret
= dquot_release(dquot
);
5799 err
= ext4_journal_stop(handle
);
5805 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
5807 struct super_block
*sb
= dquot
->dq_sb
;
5808 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
5810 /* Are we journaling quotas? */
5811 if (ext4_has_feature_quota(sb
) ||
5812 sbi
->s_qf_names
[USRQUOTA
] || sbi
->s_qf_names
[GRPQUOTA
]) {
5813 dquot_mark_dquot_dirty(dquot
);
5814 return ext4_write_dquot(dquot
);
5816 return dquot_mark_dquot_dirty(dquot
);
5820 static int ext4_write_info(struct super_block
*sb
, int type
)
5825 /* Data block + inode block */
5826 handle
= ext4_journal_start(d_inode(sb
->s_root
), EXT4_HT_QUOTA
, 2);
5828 return PTR_ERR(handle
);
5829 ret
= dquot_commit_info(sb
, type
);
5830 err
= ext4_journal_stop(handle
);
5837 * Turn on quotas during mount time - we need to find
5838 * the quota file and such...
5840 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
5842 return dquot_quota_on_mount(sb
, get_qf_name(sb
, EXT4_SB(sb
), type
),
5843 EXT4_SB(sb
)->s_jquota_fmt
, type
);
5846 static void lockdep_set_quota_inode(struct inode
*inode
, int subclass
)
5848 struct ext4_inode_info
*ei
= EXT4_I(inode
);
5850 /* The first argument of lockdep_set_subclass has to be
5851 * *exactly* the same as the argument to init_rwsem() --- in
5852 * this case, in init_once() --- or lockdep gets unhappy
5853 * because the name of the lock is set using the
5854 * stringification of the argument to init_rwsem().
5856 (void) ei
; /* shut up clang warning if !CONFIG_LOCKDEP */
5857 lockdep_set_subclass(&ei
->i_data_sem
, subclass
);
5861 * Standard function to be called on quota_on
5863 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
5864 const struct path
*path
)
5868 if (!test_opt(sb
, QUOTA
))
5871 /* Quotafile not on the same filesystem? */
5872 if (path
->dentry
->d_sb
!= sb
)
5874 /* Journaling quota? */
5875 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
5876 /* Quotafile not in fs root? */
5877 if (path
->dentry
->d_parent
!= sb
->s_root
)
5878 ext4_msg(sb
, KERN_WARNING
,
5879 "Quota file not on filesystem root. "
5880 "Journaled quota will not work");
5881 sb_dqopt(sb
)->flags
|= DQUOT_NOLIST_DIRTY
;
5884 * Clear the flag just in case mount options changed since
5887 sb_dqopt(sb
)->flags
&= ~DQUOT_NOLIST_DIRTY
;
5891 * When we journal data on quota file, we have to flush journal to see
5892 * all updates to the file when we bypass pagecache...
5894 if (EXT4_SB(sb
)->s_journal
&&
5895 ext4_should_journal_data(d_inode(path
->dentry
))) {
5897 * We don't need to lock updates but journal_flush() could
5898 * otherwise be livelocked...
5900 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
5901 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
5902 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
5907 lockdep_set_quota_inode(path
->dentry
->d_inode
, I_DATA_SEM_QUOTA
);
5908 err
= dquot_quota_on(sb
, type
, format_id
, path
);
5910 lockdep_set_quota_inode(path
->dentry
->d_inode
,
5913 struct inode
*inode
= d_inode(path
->dentry
);
5917 * Set inode flags to prevent userspace from messing with quota
5918 * files. If this fails, we return success anyway since quotas
5919 * are already enabled and this is not a hard failure.
5922 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
, 1);
5925 EXT4_I(inode
)->i_flags
|= EXT4_NOATIME_FL
| EXT4_IMMUTABLE_FL
;
5926 inode_set_flags(inode
, S_NOATIME
| S_IMMUTABLE
,
5927 S_NOATIME
| S_IMMUTABLE
);
5928 ext4_mark_inode_dirty(handle
, inode
);
5929 ext4_journal_stop(handle
);
5931 inode_unlock(inode
);
5936 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
5940 struct inode
*qf_inode
;
5941 unsigned long qf_inums
[EXT4_MAXQUOTAS
] = {
5942 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
5943 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
),
5944 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_prj_quota_inum
)
5947 BUG_ON(!ext4_has_feature_quota(sb
));
5949 if (!qf_inums
[type
])
5952 qf_inode
= ext4_iget(sb
, qf_inums
[type
], EXT4_IGET_SPECIAL
);
5953 if (IS_ERR(qf_inode
)) {
5954 ext4_error(sb
, "Bad quota inode # %lu", qf_inums
[type
]);
5955 return PTR_ERR(qf_inode
);
5958 /* Don't account quota for quota files to avoid recursion */
5959 qf_inode
->i_flags
|= S_NOQUOTA
;
5960 lockdep_set_quota_inode(qf_inode
, I_DATA_SEM_QUOTA
);
5961 err
= dquot_load_quota_inode(qf_inode
, type
, format_id
, flags
);
5963 lockdep_set_quota_inode(qf_inode
, I_DATA_SEM_NORMAL
);
5969 /* Enable usage tracking for all quota types. */
5970 static int ext4_enable_quotas(struct super_block
*sb
)
5973 unsigned long qf_inums
[EXT4_MAXQUOTAS
] = {
5974 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
5975 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
),
5976 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_prj_quota_inum
)
5978 bool quota_mopt
[EXT4_MAXQUOTAS
] = {
5979 test_opt(sb
, USRQUOTA
),
5980 test_opt(sb
, GRPQUOTA
),
5981 test_opt(sb
, PRJQUOTA
),
5984 sb_dqopt(sb
)->flags
|= DQUOT_QUOTA_SYS_FILE
| DQUOT_NOLIST_DIRTY
;
5985 for (type
= 0; type
< EXT4_MAXQUOTAS
; type
++) {
5986 if (qf_inums
[type
]) {
5987 err
= ext4_quota_enable(sb
, type
, QFMT_VFS_V1
,
5988 DQUOT_USAGE_ENABLED
|
5989 (quota_mopt
[type
] ? DQUOT_LIMITS_ENABLED
: 0));
5992 "Failed to enable quota tracking "
5993 "(type=%d, err=%d). Please run "
5994 "e2fsck to fix.", type
, err
);
5995 for (type
--; type
>= 0; type
--)
5996 dquot_quota_off(sb
, type
);
6005 static int ext4_quota_off(struct super_block
*sb
, int type
)
6007 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
6011 /* Force all delayed allocation blocks to be allocated.
6012 * Caller already holds s_umount sem */
6013 if (test_opt(sb
, DELALLOC
))
6014 sync_filesystem(sb
);
6016 if (!inode
|| !igrab(inode
))
6019 err
= dquot_quota_off(sb
, type
);
6020 if (err
|| ext4_has_feature_quota(sb
))
6025 * Update modification times of quota files when userspace can
6026 * start looking at them. If we fail, we return success anyway since
6027 * this is not a hard failure and quotas are already disabled.
6029 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
, 1);
6032 EXT4_I(inode
)->i_flags
&= ~(EXT4_NOATIME_FL
| EXT4_IMMUTABLE_FL
);
6033 inode_set_flags(inode
, 0, S_NOATIME
| S_IMMUTABLE
);
6034 inode
->i_mtime
= inode
->i_ctime
= current_time(inode
);
6035 ext4_mark_inode_dirty(handle
, inode
);
6036 ext4_journal_stop(handle
);
6038 inode_unlock(inode
);
6040 lockdep_set_quota_inode(inode
, I_DATA_SEM_NORMAL
);
6044 return dquot_quota_off(sb
, type
);
6047 /* Read data from quotafile - avoid pagecache and such because we cannot afford
6048 * acquiring the locks... As quota files are never truncated and quota code
6049 * itself serializes the operations (and no one else should touch the files)
6050 * we don't have to be afraid of races */
6051 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
6052 size_t len
, loff_t off
)
6054 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
6055 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
6056 int offset
= off
& (sb
->s_blocksize
- 1);
6059 struct buffer_head
*bh
;
6060 loff_t i_size
= i_size_read(inode
);
6064 if (off
+len
> i_size
)
6067 while (toread
> 0) {
6068 tocopy
= sb
->s_blocksize
- offset
< toread
?
6069 sb
->s_blocksize
- offset
: toread
;
6070 bh
= ext4_bread(NULL
, inode
, blk
, 0);
6073 if (!bh
) /* A hole? */
6074 memset(data
, 0, tocopy
);
6076 memcpy(data
, bh
->b_data
+offset
, tocopy
);
6086 /* Write to quotafile (we know the transaction is already started and has
6087 * enough credits) */
6088 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
6089 const char *data
, size_t len
, loff_t off
)
6091 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
6092 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
6093 int err
, offset
= off
& (sb
->s_blocksize
- 1);
6095 struct buffer_head
*bh
;
6096 handle_t
*handle
= journal_current_handle();
6098 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
6099 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
6100 " cancelled because transaction is not started",
6101 (unsigned long long)off
, (unsigned long long)len
);
6105 * Since we account only one data block in transaction credits,
6106 * then it is impossible to cross a block boundary.
6108 if (sb
->s_blocksize
- offset
< len
) {
6109 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
6110 " cancelled because not block aligned",
6111 (unsigned long long)off
, (unsigned long long)len
);
6116 bh
= ext4_bread(handle
, inode
, blk
,
6117 EXT4_GET_BLOCKS_CREATE
|
6118 EXT4_GET_BLOCKS_METADATA_NOFAIL
);
6119 } while (PTR_ERR(bh
) == -ENOSPC
&&
6120 ext4_should_retry_alloc(inode
->i_sb
, &retries
));
6125 BUFFER_TRACE(bh
, "get write access");
6126 err
= ext4_journal_get_write_access(handle
, bh
);
6132 memcpy(bh
->b_data
+offset
, data
, len
);
6133 flush_dcache_page(bh
->b_page
);
6135 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
6138 if (inode
->i_size
< off
+ len
) {
6139 i_size_write(inode
, off
+ len
);
6140 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
6141 ext4_mark_inode_dirty(handle
, inode
);
6147 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
6148 const char *dev_name
, void *data
)
6150 return mount_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
);
6153 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
6154 static inline void register_as_ext2(void)
6156 int err
= register_filesystem(&ext2_fs_type
);
6159 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
6162 static inline void unregister_as_ext2(void)
6164 unregister_filesystem(&ext2_fs_type
);
6167 static inline int ext2_feature_set_ok(struct super_block
*sb
)
6169 if (ext4_has_unknown_ext2_incompat_features(sb
))
6173 if (ext4_has_unknown_ext2_ro_compat_features(sb
))
6178 static inline void register_as_ext2(void) { }
6179 static inline void unregister_as_ext2(void) { }
6180 static inline int ext2_feature_set_ok(struct super_block
*sb
) { return 0; }
6183 static inline void register_as_ext3(void)
6185 int err
= register_filesystem(&ext3_fs_type
);
6188 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
6191 static inline void unregister_as_ext3(void)
6193 unregister_filesystem(&ext3_fs_type
);
6196 static inline int ext3_feature_set_ok(struct super_block
*sb
)
6198 if (ext4_has_unknown_ext3_incompat_features(sb
))
6200 if (!ext4_has_feature_journal(sb
))
6204 if (ext4_has_unknown_ext3_ro_compat_features(sb
))
6209 static struct file_system_type ext4_fs_type
= {
6210 .owner
= THIS_MODULE
,
6212 .mount
= ext4_mount
,
6213 .kill_sb
= kill_block_super
,
6214 .fs_flags
= FS_REQUIRES_DEV
,
6216 MODULE_ALIAS_FS("ext4");
6218 /* Shared across all ext4 file systems */
6219 wait_queue_head_t ext4__ioend_wq
[EXT4_WQ_HASH_SZ
];
6221 static int __init
ext4_init_fs(void)
6225 ratelimit_state_init(&ext4_mount_msg_ratelimit
, 30 * HZ
, 64);
6226 ext4_li_info
= NULL
;
6227 mutex_init(&ext4_li_mtx
);
6229 /* Build-time check for flags consistency */
6230 ext4_check_flag_values();
6232 for (i
= 0; i
< EXT4_WQ_HASH_SZ
; i
++)
6233 init_waitqueue_head(&ext4__ioend_wq
[i
]);
6235 err
= ext4_init_es();
6239 err
= ext4_init_pending();
6243 err
= ext4_init_post_read_processing();
6247 err
= ext4_init_pageio();
6251 err
= ext4_init_system_zone();
6255 err
= ext4_init_sysfs();
6259 err
= ext4_init_mballoc();
6262 err
= init_inodecache();
6267 err
= register_filesystem(&ext4_fs_type
);
6273 unregister_as_ext2();
6274 unregister_as_ext3();
6275 destroy_inodecache();
6277 ext4_exit_mballoc();
6281 ext4_exit_system_zone();
6285 ext4_exit_post_read_processing();
6287 ext4_exit_pending();
6294 static void __exit
ext4_exit_fs(void)
6296 ext4_destroy_lazyinit_thread();
6297 unregister_as_ext2();
6298 unregister_as_ext3();
6299 unregister_filesystem(&ext4_fs_type
);
6300 destroy_inodecache();
6301 ext4_exit_mballoc();
6303 ext4_exit_system_zone();
6305 ext4_exit_post_read_processing();
6307 ext4_exit_pending();
6310 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
6311 MODULE_DESCRIPTION("Fourth Extended Filesystem");
6312 MODULE_LICENSE("GPL");
6313 MODULE_SOFTDEP("pre: crc32c");
6314 module_init(ext4_init_fs
)
6315 module_exit(ext4_exit_fs
)