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 void ext4_update_super(struct super_block
*sb
);
69 static int ext4_commit_super(struct super_block
*sb
);
70 static int ext4_mark_recovery_complete(struct super_block
*sb
,
71 struct ext4_super_block
*es
);
72 static int ext4_clear_journal_err(struct super_block
*sb
,
73 struct ext4_super_block
*es
);
74 static int ext4_sync_fs(struct super_block
*sb
, int wait
);
75 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
);
76 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
);
77 static int ext4_unfreeze(struct super_block
*sb
);
78 static int ext4_freeze(struct super_block
*sb
);
79 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
80 const char *dev_name
, void *data
);
81 static inline int ext2_feature_set_ok(struct super_block
*sb
);
82 static inline int ext3_feature_set_ok(struct super_block
*sb
);
83 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
);
84 static void ext4_destroy_lazyinit_thread(void);
85 static void ext4_unregister_li_request(struct super_block
*sb
);
86 static void ext4_clear_request_list(void);
87 static struct inode
*ext4_get_journal_inode(struct super_block
*sb
,
88 unsigned int journal_inum
);
93 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
94 * i_mmap_rwsem (inode->i_mmap_rwsem)!
97 * mmap_lock -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
98 * page lock -> i_data_sem (rw)
100 * buffered write path:
101 * sb_start_write -> i_mutex -> mmap_lock
102 * sb_start_write -> i_mutex -> transaction start -> page lock ->
106 * sb_start_write -> i_mutex -> i_mmap_sem (w) -> i_mmap_rwsem (w) -> page lock
107 * sb_start_write -> i_mutex -> i_mmap_sem (w) -> transaction start ->
111 * sb_start_write -> i_mutex -> mmap_lock
112 * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw)
115 * transaction start -> page lock(s) -> i_data_sem (rw)
118 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
119 static struct file_system_type ext2_fs_type
= {
120 .owner
= THIS_MODULE
,
123 .kill_sb
= kill_block_super
,
124 .fs_flags
= FS_REQUIRES_DEV
,
126 MODULE_ALIAS_FS("ext2");
127 MODULE_ALIAS("ext2");
128 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
130 #define IS_EXT2_SB(sb) (0)
134 static struct file_system_type ext3_fs_type
= {
135 .owner
= THIS_MODULE
,
138 .kill_sb
= kill_block_super
,
139 .fs_flags
= FS_REQUIRES_DEV
,
141 MODULE_ALIAS_FS("ext3");
142 MODULE_ALIAS("ext3");
143 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
146 static inline void __ext4_read_bh(struct buffer_head
*bh
, int op_flags
,
150 * buffer's verified bit is no longer valid after reading from
151 * disk again due to write out error, clear it to make sure we
152 * recheck the buffer contents.
154 clear_buffer_verified(bh
);
156 bh
->b_end_io
= end_io
? end_io
: end_buffer_read_sync
;
158 submit_bh(REQ_OP_READ
, op_flags
, bh
);
161 void ext4_read_bh_nowait(struct buffer_head
*bh
, int op_flags
,
164 BUG_ON(!buffer_locked(bh
));
166 if (ext4_buffer_uptodate(bh
)) {
170 __ext4_read_bh(bh
, op_flags
, end_io
);
173 int ext4_read_bh(struct buffer_head
*bh
, int op_flags
, bh_end_io_t
*end_io
)
175 BUG_ON(!buffer_locked(bh
));
177 if (ext4_buffer_uptodate(bh
)) {
182 __ext4_read_bh(bh
, op_flags
, end_io
);
185 if (buffer_uptodate(bh
))
190 int ext4_read_bh_lock(struct buffer_head
*bh
, int op_flags
, bool wait
)
192 if (trylock_buffer(bh
)) {
194 return ext4_read_bh(bh
, op_flags
, NULL
);
195 ext4_read_bh_nowait(bh
, op_flags
, NULL
);
200 if (buffer_uptodate(bh
))
208 * This works like __bread_gfp() except it uses ERR_PTR for error
209 * returns. Currently with sb_bread it's impossible to distinguish
210 * between ENOMEM and EIO situations (since both result in a NULL
213 static struct buffer_head
*__ext4_sb_bread_gfp(struct super_block
*sb
,
214 sector_t block
, int op_flags
,
217 struct buffer_head
*bh
;
220 bh
= sb_getblk_gfp(sb
, block
, gfp
);
222 return ERR_PTR(-ENOMEM
);
223 if (ext4_buffer_uptodate(bh
))
226 ret
= ext4_read_bh_lock(bh
, REQ_META
| op_flags
, true);
234 struct buffer_head
*ext4_sb_bread(struct super_block
*sb
, sector_t block
,
237 return __ext4_sb_bread_gfp(sb
, block
, op_flags
, __GFP_MOVABLE
);
240 struct buffer_head
*ext4_sb_bread_unmovable(struct super_block
*sb
,
243 return __ext4_sb_bread_gfp(sb
, block
, 0, 0);
246 void ext4_sb_breadahead_unmovable(struct super_block
*sb
, sector_t block
)
248 struct buffer_head
*bh
= sb_getblk_gfp(sb
, block
, 0);
251 ext4_read_bh_lock(bh
, REQ_RAHEAD
, false);
256 static int ext4_verify_csum_type(struct super_block
*sb
,
257 struct ext4_super_block
*es
)
259 if (!ext4_has_feature_metadata_csum(sb
))
262 return es
->s_checksum_type
== EXT4_CRC32C_CHKSUM
;
265 static __le32
ext4_superblock_csum(struct super_block
*sb
,
266 struct ext4_super_block
*es
)
268 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
269 int offset
= offsetof(struct ext4_super_block
, s_checksum
);
272 csum
= ext4_chksum(sbi
, ~0, (char *)es
, offset
);
274 return cpu_to_le32(csum
);
277 static int ext4_superblock_csum_verify(struct super_block
*sb
,
278 struct ext4_super_block
*es
)
280 if (!ext4_has_metadata_csum(sb
))
283 return es
->s_checksum
== ext4_superblock_csum(sb
, es
);
286 void ext4_superblock_csum_set(struct super_block
*sb
)
288 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
290 if (!ext4_has_metadata_csum(sb
))
293 es
->s_checksum
= ext4_superblock_csum(sb
, es
);
296 ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
297 struct ext4_group_desc
*bg
)
299 return le32_to_cpu(bg
->bg_block_bitmap_lo
) |
300 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
301 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_block_bitmap_hi
) << 32 : 0);
304 ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
305 struct ext4_group_desc
*bg
)
307 return le32_to_cpu(bg
->bg_inode_bitmap_lo
) |
308 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
309 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_bitmap_hi
) << 32 : 0);
312 ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
313 struct ext4_group_desc
*bg
)
315 return le32_to_cpu(bg
->bg_inode_table_lo
) |
316 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
317 (ext4_fsblk_t
)le32_to_cpu(bg
->bg_inode_table_hi
) << 32 : 0);
320 __u32
ext4_free_group_clusters(struct super_block
*sb
,
321 struct ext4_group_desc
*bg
)
323 return le16_to_cpu(bg
->bg_free_blocks_count_lo
) |
324 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
325 (__u32
)le16_to_cpu(bg
->bg_free_blocks_count_hi
) << 16 : 0);
328 __u32
ext4_free_inodes_count(struct super_block
*sb
,
329 struct ext4_group_desc
*bg
)
331 return le16_to_cpu(bg
->bg_free_inodes_count_lo
) |
332 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
333 (__u32
)le16_to_cpu(bg
->bg_free_inodes_count_hi
) << 16 : 0);
336 __u32
ext4_used_dirs_count(struct super_block
*sb
,
337 struct ext4_group_desc
*bg
)
339 return le16_to_cpu(bg
->bg_used_dirs_count_lo
) |
340 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
341 (__u32
)le16_to_cpu(bg
->bg_used_dirs_count_hi
) << 16 : 0);
344 __u32
ext4_itable_unused_count(struct super_block
*sb
,
345 struct ext4_group_desc
*bg
)
347 return le16_to_cpu(bg
->bg_itable_unused_lo
) |
348 (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
?
349 (__u32
)le16_to_cpu(bg
->bg_itable_unused_hi
) << 16 : 0);
352 void ext4_block_bitmap_set(struct super_block
*sb
,
353 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
355 bg
->bg_block_bitmap_lo
= cpu_to_le32((u32
)blk
);
356 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
357 bg
->bg_block_bitmap_hi
= cpu_to_le32(blk
>> 32);
360 void ext4_inode_bitmap_set(struct super_block
*sb
,
361 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
363 bg
->bg_inode_bitmap_lo
= cpu_to_le32((u32
)blk
);
364 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
365 bg
->bg_inode_bitmap_hi
= cpu_to_le32(blk
>> 32);
368 void ext4_inode_table_set(struct super_block
*sb
,
369 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
)
371 bg
->bg_inode_table_lo
= cpu_to_le32((u32
)blk
);
372 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
373 bg
->bg_inode_table_hi
= cpu_to_le32(blk
>> 32);
376 void ext4_free_group_clusters_set(struct super_block
*sb
,
377 struct ext4_group_desc
*bg
, __u32 count
)
379 bg
->bg_free_blocks_count_lo
= cpu_to_le16((__u16
)count
);
380 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
381 bg
->bg_free_blocks_count_hi
= cpu_to_le16(count
>> 16);
384 void ext4_free_inodes_set(struct super_block
*sb
,
385 struct ext4_group_desc
*bg
, __u32 count
)
387 bg
->bg_free_inodes_count_lo
= cpu_to_le16((__u16
)count
);
388 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
389 bg
->bg_free_inodes_count_hi
= cpu_to_le16(count
>> 16);
392 void ext4_used_dirs_set(struct super_block
*sb
,
393 struct ext4_group_desc
*bg
, __u32 count
)
395 bg
->bg_used_dirs_count_lo
= cpu_to_le16((__u16
)count
);
396 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
397 bg
->bg_used_dirs_count_hi
= cpu_to_le16(count
>> 16);
400 void ext4_itable_unused_set(struct super_block
*sb
,
401 struct ext4_group_desc
*bg
, __u32 count
)
403 bg
->bg_itable_unused_lo
= cpu_to_le16((__u16
)count
);
404 if (EXT4_DESC_SIZE(sb
) >= EXT4_MIN_DESC_SIZE_64BIT
)
405 bg
->bg_itable_unused_hi
= cpu_to_le16(count
>> 16);
408 static void __ext4_update_tstamp(__le32
*lo
, __u8
*hi
, time64_t now
)
410 now
= clamp_val(now
, 0, (1ull << 40) - 1);
412 *lo
= cpu_to_le32(lower_32_bits(now
));
413 *hi
= upper_32_bits(now
);
416 static time64_t
__ext4_get_tstamp(__le32
*lo
, __u8
*hi
)
418 return ((time64_t
)(*hi
) << 32) + le32_to_cpu(*lo
);
420 #define ext4_update_tstamp(es, tstamp) \
421 __ext4_update_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi, \
422 ktime_get_real_seconds())
423 #define ext4_get_tstamp(es, tstamp) \
424 __ext4_get_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
427 * The del_gendisk() function uninitializes the disk-specific data
428 * structures, including the bdi structure, without telling anyone
429 * else. Once this happens, any attempt to call mark_buffer_dirty()
430 * (for example, by ext4_commit_super), will cause a kernel OOPS.
431 * This is a kludge to prevent these oops until we can put in a proper
432 * hook in del_gendisk() to inform the VFS and file system layers.
434 static int block_device_ejected(struct super_block
*sb
)
436 struct inode
*bd_inode
= sb
->s_bdev
->bd_inode
;
437 struct backing_dev_info
*bdi
= inode_to_bdi(bd_inode
);
439 return bdi
->dev
== NULL
;
442 static void ext4_journal_commit_callback(journal_t
*journal
, transaction_t
*txn
)
444 struct super_block
*sb
= journal
->j_private
;
445 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
446 int error
= is_journal_aborted(journal
);
447 struct ext4_journal_cb_entry
*jce
;
449 BUG_ON(txn
->t_state
== T_FINISHED
);
451 ext4_process_freed_data(sb
, txn
->t_tid
);
453 spin_lock(&sbi
->s_md_lock
);
454 while (!list_empty(&txn
->t_private_list
)) {
455 jce
= list_entry(txn
->t_private_list
.next
,
456 struct ext4_journal_cb_entry
, jce_list
);
457 list_del_init(&jce
->jce_list
);
458 spin_unlock(&sbi
->s_md_lock
);
459 jce
->jce_func(sb
, jce
, error
);
460 spin_lock(&sbi
->s_md_lock
);
462 spin_unlock(&sbi
->s_md_lock
);
466 * This writepage callback for write_cache_pages()
467 * takes care of a few cases after page cleaning.
469 * write_cache_pages() already checks for dirty pages
470 * and calls clear_page_dirty_for_io(), which we want,
471 * to write protect the pages.
473 * However, we may have to redirty a page (see below.)
475 static int ext4_journalled_writepage_callback(struct page
*page
,
476 struct writeback_control
*wbc
,
479 transaction_t
*transaction
= (transaction_t
*) data
;
480 struct buffer_head
*bh
, *head
;
481 struct journal_head
*jh
;
483 bh
= head
= page_buffers(page
);
486 * We have to redirty a page in these cases:
487 * 1) If buffer is dirty, it means the page was dirty because it
488 * contains a buffer that needs checkpointing. So the dirty bit
489 * needs to be preserved so that checkpointing writes the buffer
491 * 2) If buffer is not part of the committing transaction
492 * (we may have just accidentally come across this buffer because
493 * inode range tracking is not exact) or if the currently running
494 * transaction already contains this buffer as well, dirty bit
495 * needs to be preserved so that the buffer gets writeprotected
496 * properly on running transaction's commit.
499 if (buffer_dirty(bh
) ||
500 (jh
&& (jh
->b_transaction
!= transaction
||
501 jh
->b_next_transaction
))) {
502 redirty_page_for_writepage(wbc
, page
);
505 } while ((bh
= bh
->b_this_page
) != head
);
508 return AOP_WRITEPAGE_ACTIVATE
;
511 static int ext4_journalled_submit_inode_data_buffers(struct jbd2_inode
*jinode
)
513 struct address_space
*mapping
= jinode
->i_vfs_inode
->i_mapping
;
514 struct writeback_control wbc
= {
515 .sync_mode
= WB_SYNC_ALL
,
516 .nr_to_write
= LONG_MAX
,
517 .range_start
= jinode
->i_dirty_start
,
518 .range_end
= jinode
->i_dirty_end
,
521 return write_cache_pages(mapping
, &wbc
,
522 ext4_journalled_writepage_callback
,
523 jinode
->i_transaction
);
526 static int ext4_journal_submit_inode_data_buffers(struct jbd2_inode
*jinode
)
530 if (ext4_should_journal_data(jinode
->i_vfs_inode
))
531 ret
= ext4_journalled_submit_inode_data_buffers(jinode
);
533 ret
= jbd2_journal_submit_inode_data_buffers(jinode
);
538 static int ext4_journal_finish_inode_data_buffers(struct jbd2_inode
*jinode
)
542 if (!ext4_should_journal_data(jinode
->i_vfs_inode
))
543 ret
= jbd2_journal_finish_inode_data_buffers(jinode
);
548 static bool system_going_down(void)
550 return system_state
== SYSTEM_HALT
|| system_state
== SYSTEM_POWER_OFF
551 || system_state
== SYSTEM_RESTART
;
554 struct ext4_err_translation
{
559 #define EXT4_ERR_TRANSLATE(err) { .code = EXT4_ERR_##err, .errno = err }
561 static struct ext4_err_translation err_translation
[] = {
562 EXT4_ERR_TRANSLATE(EIO
),
563 EXT4_ERR_TRANSLATE(ENOMEM
),
564 EXT4_ERR_TRANSLATE(EFSBADCRC
),
565 EXT4_ERR_TRANSLATE(EFSCORRUPTED
),
566 EXT4_ERR_TRANSLATE(ENOSPC
),
567 EXT4_ERR_TRANSLATE(ENOKEY
),
568 EXT4_ERR_TRANSLATE(EROFS
),
569 EXT4_ERR_TRANSLATE(EFBIG
),
570 EXT4_ERR_TRANSLATE(EEXIST
),
571 EXT4_ERR_TRANSLATE(ERANGE
),
572 EXT4_ERR_TRANSLATE(EOVERFLOW
),
573 EXT4_ERR_TRANSLATE(EBUSY
),
574 EXT4_ERR_TRANSLATE(ENOTDIR
),
575 EXT4_ERR_TRANSLATE(ENOTEMPTY
),
576 EXT4_ERR_TRANSLATE(ESHUTDOWN
),
577 EXT4_ERR_TRANSLATE(EFAULT
),
580 static int ext4_errno_to_code(int errno
)
584 for (i
= 0; i
< ARRAY_SIZE(err_translation
); i
++)
585 if (err_translation
[i
].errno
== errno
)
586 return err_translation
[i
].code
;
587 return EXT4_ERR_UNKNOWN
;
590 static void save_error_info(struct super_block
*sb
, int error
,
591 __u32 ino
, __u64 block
,
592 const char *func
, unsigned int line
)
594 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
596 /* We default to EFSCORRUPTED error... */
598 error
= EFSCORRUPTED
;
600 spin_lock(&sbi
->s_error_lock
);
601 sbi
->s_add_error_count
++;
602 sbi
->s_last_error_code
= error
;
603 sbi
->s_last_error_line
= line
;
604 sbi
->s_last_error_ino
= ino
;
605 sbi
->s_last_error_block
= block
;
606 sbi
->s_last_error_func
= func
;
607 sbi
->s_last_error_time
= ktime_get_real_seconds();
608 if (!sbi
->s_first_error_time
) {
609 sbi
->s_first_error_code
= error
;
610 sbi
->s_first_error_line
= line
;
611 sbi
->s_first_error_ino
= ino
;
612 sbi
->s_first_error_block
= block
;
613 sbi
->s_first_error_func
= func
;
614 sbi
->s_first_error_time
= sbi
->s_last_error_time
;
616 spin_unlock(&sbi
->s_error_lock
);
619 /* Deal with the reporting of failure conditions on a filesystem such as
620 * inconsistencies detected or read IO failures.
622 * On ext2, we can store the error state of the filesystem in the
623 * superblock. That is not possible on ext4, because we may have other
624 * write ordering constraints on the superblock which prevent us from
625 * writing it out straight away; and given that the journal is about to
626 * be aborted, we can't rely on the current, or future, transactions to
627 * write out the superblock safely.
629 * We'll just use the jbd2_journal_abort() error code to record an error in
630 * the journal instead. On recovery, the journal will complain about
631 * that error until we've noted it down and cleared it.
633 * If force_ro is set, we unconditionally force the filesystem into an
634 * ABORT|READONLY state, unless the error response on the fs has been set to
635 * panic in which case we take the easy way out and panic immediately. This is
636 * used to deal with unrecoverable failures such as journal IO errors or ENOMEM
637 * at a critical moment in log management.
639 static void ext4_handle_error(struct super_block
*sb
, bool force_ro
, int error
,
640 __u32 ino
, __u64 block
,
641 const char *func
, unsigned int line
)
643 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
644 bool continue_fs
= !force_ro
&& test_opt(sb
, ERRORS_CONT
);
646 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
647 if (test_opt(sb
, WARN_ON_ERROR
))
650 if (!continue_fs
&& !sb_rdonly(sb
)) {
651 ext4_set_mount_flag(sb
, EXT4_MF_FS_ABORTED
);
653 jbd2_journal_abort(journal
, -EIO
);
656 if (!bdev_read_only(sb
->s_bdev
)) {
657 save_error_info(sb
, error
, ino
, block
, func
, line
);
659 * In case the fs should keep running, we need to writeout
660 * superblock through the journal. Due to lock ordering
661 * constraints, it may not be safe to do it right here so we
662 * defer superblock flushing to a workqueue.
665 schedule_work(&EXT4_SB(sb
)->s_error_work
);
667 ext4_commit_super(sb
);
670 if (sb_rdonly(sb
) || continue_fs
)
674 * We force ERRORS_RO behavior when system is rebooting. Otherwise we
675 * could panic during 'reboot -f' as the underlying device got already
678 if (test_opt(sb
, ERRORS_PANIC
) && !system_going_down()) {
679 panic("EXT4-fs (device %s): panic forced after error\n",
682 ext4_msg(sb
, KERN_CRIT
, "Remounting filesystem read-only");
684 * Make sure updated value of ->s_mount_flags will be visible before
688 sb
->s_flags
|= SB_RDONLY
;
691 static void flush_stashed_error_work(struct work_struct
*work
)
693 struct ext4_sb_info
*sbi
= container_of(work
, struct ext4_sb_info
,
695 journal_t
*journal
= sbi
->s_journal
;
699 * If the journal is still running, we have to write out superblock
700 * through the journal to avoid collisions of other journalled sb
703 * We use directly jbd2 functions here to avoid recursing back into
704 * ext4 error handling code during handling of previous errors.
706 if (!sb_rdonly(sbi
->s_sb
) && journal
) {
707 handle
= jbd2_journal_start(journal
, 1);
710 if (jbd2_journal_get_write_access(handle
, sbi
->s_sbh
)) {
711 jbd2_journal_stop(handle
);
714 ext4_update_super(sbi
->s_sb
);
715 if (jbd2_journal_dirty_metadata(handle
, sbi
->s_sbh
)) {
716 jbd2_journal_stop(handle
);
719 jbd2_journal_stop(handle
);
724 * Write through journal failed. Write sb directly to get error info
725 * out and hope for the best.
727 ext4_commit_super(sbi
->s_sb
);
730 #define ext4_error_ratelimit(sb) \
731 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
734 void __ext4_error(struct super_block
*sb
, const char *function
,
735 unsigned int line
, bool force_ro
, int error
, __u64 block
,
736 const char *fmt
, ...)
738 struct va_format vaf
;
741 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
744 trace_ext4_error(sb
, function
, line
);
745 if (ext4_error_ratelimit(sb
)) {
750 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
751 sb
->s_id
, function
, line
, current
->comm
, &vaf
);
754 ext4_handle_error(sb
, force_ro
, error
, 0, block
, function
, line
);
757 void __ext4_error_inode(struct inode
*inode
, const char *function
,
758 unsigned int line
, ext4_fsblk_t block
, int error
,
759 const char *fmt
, ...)
762 struct va_format vaf
;
764 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode
->i_sb
))))
767 trace_ext4_error(inode
->i_sb
, function
, line
);
768 if (ext4_error_ratelimit(inode
->i_sb
)) {
773 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
774 "inode #%lu: block %llu: comm %s: %pV\n",
775 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
776 block
, current
->comm
, &vaf
);
778 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: "
779 "inode #%lu: comm %s: %pV\n",
780 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
781 current
->comm
, &vaf
);
784 ext4_handle_error(inode
->i_sb
, false, error
, inode
->i_ino
, block
,
788 void __ext4_error_file(struct file
*file
, const char *function
,
789 unsigned int line
, ext4_fsblk_t block
,
790 const char *fmt
, ...)
793 struct va_format vaf
;
794 struct inode
*inode
= file_inode(file
);
795 char pathname
[80], *path
;
797 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode
->i_sb
))))
800 trace_ext4_error(inode
->i_sb
, function
, line
);
801 if (ext4_error_ratelimit(inode
->i_sb
)) {
802 path
= file_path(file
, pathname
, sizeof(pathname
));
810 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
811 "block %llu: comm %s: path %s: %pV\n",
812 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
813 block
, current
->comm
, path
, &vaf
);
816 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
817 "comm %s: path %s: %pV\n",
818 inode
->i_sb
->s_id
, function
, line
, inode
->i_ino
,
819 current
->comm
, path
, &vaf
);
822 ext4_handle_error(inode
->i_sb
, false, EFSCORRUPTED
, inode
->i_ino
, block
,
826 const char *ext4_decode_error(struct super_block
*sb
, int errno
,
833 errstr
= "Corrupt filesystem";
836 errstr
= "Filesystem failed CRC";
839 errstr
= "IO failure";
842 errstr
= "Out of memory";
845 if (!sb
|| (EXT4_SB(sb
)->s_journal
&&
846 EXT4_SB(sb
)->s_journal
->j_flags
& JBD2_ABORT
))
847 errstr
= "Journal has aborted";
849 errstr
= "Readonly filesystem";
852 /* If the caller passed in an extra buffer for unknown
853 * errors, textualise them now. Else we just return
856 /* Check for truncated error codes... */
857 if (snprintf(nbuf
, 16, "error %d", -errno
) >= 0)
866 /* __ext4_std_error decodes expected errors from journaling functions
867 * automatically and invokes the appropriate error response. */
869 void __ext4_std_error(struct super_block
*sb
, const char *function
,
870 unsigned int line
, int errno
)
875 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
878 /* Special case: if the error is EROFS, and we're not already
879 * inside a transaction, then there's really no point in logging
881 if (errno
== -EROFS
&& journal_current_handle() == NULL
&& sb_rdonly(sb
))
884 if (ext4_error_ratelimit(sb
)) {
885 errstr
= ext4_decode_error(sb
, errno
, nbuf
);
886 printk(KERN_CRIT
"EXT4-fs error (device %s) in %s:%d: %s\n",
887 sb
->s_id
, function
, line
, errstr
);
890 ext4_handle_error(sb
, false, -errno
, 0, 0, function
, line
);
893 void __ext4_msg(struct super_block
*sb
,
894 const char *prefix
, const char *fmt
, ...)
896 struct va_format vaf
;
899 atomic_inc(&EXT4_SB(sb
)->s_msg_count
);
900 if (!___ratelimit(&(EXT4_SB(sb
)->s_msg_ratelimit_state
), "EXT4-fs"))
906 printk("%sEXT4-fs (%s): %pV\n", prefix
, sb
->s_id
, &vaf
);
910 static int ext4_warning_ratelimit(struct super_block
*sb
)
912 atomic_inc(&EXT4_SB(sb
)->s_warning_count
);
913 return ___ratelimit(&(EXT4_SB(sb
)->s_warning_ratelimit_state
),
917 void __ext4_warning(struct super_block
*sb
, const char *function
,
918 unsigned int line
, const char *fmt
, ...)
920 struct va_format vaf
;
923 if (!ext4_warning_ratelimit(sb
))
929 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: %pV\n",
930 sb
->s_id
, function
, line
, &vaf
);
934 void __ext4_warning_inode(const struct inode
*inode
, const char *function
,
935 unsigned int line
, const char *fmt
, ...)
937 struct va_format vaf
;
940 if (!ext4_warning_ratelimit(inode
->i_sb
))
946 printk(KERN_WARNING
"EXT4-fs warning (device %s): %s:%d: "
947 "inode #%lu: comm %s: %pV\n", inode
->i_sb
->s_id
,
948 function
, line
, inode
->i_ino
, current
->comm
, &vaf
);
952 void __ext4_grp_locked_error(const char *function
, unsigned int line
,
953 struct super_block
*sb
, ext4_group_t grp
,
954 unsigned long ino
, ext4_fsblk_t block
,
955 const char *fmt
, ...)
959 struct va_format vaf
;
962 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb
))))
965 trace_ext4_error(sb
, function
, line
);
966 if (ext4_error_ratelimit(sb
)) {
970 printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: group %u, ",
971 sb
->s_id
, function
, line
, grp
);
973 printk(KERN_CONT
"inode %lu: ", ino
);
975 printk(KERN_CONT
"block %llu:",
976 (unsigned long long) block
);
977 printk(KERN_CONT
"%pV\n", &vaf
);
981 if (test_opt(sb
, ERRORS_CONT
)) {
982 if (test_opt(sb
, WARN_ON_ERROR
))
984 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
985 if (!bdev_read_only(sb
->s_bdev
)) {
986 save_error_info(sb
, EFSCORRUPTED
, ino
, block
, function
,
988 schedule_work(&EXT4_SB(sb
)->s_error_work
);
992 ext4_unlock_group(sb
, grp
);
993 ext4_handle_error(sb
, false, EFSCORRUPTED
, ino
, block
, function
, line
);
995 * We only get here in the ERRORS_RO case; relocking the group
996 * may be dangerous, but nothing bad will happen since the
997 * filesystem will have already been marked read/only and the
998 * journal has been aborted. We return 1 as a hint to callers
999 * who might what to use the return value from
1000 * ext4_grp_locked_error() to distinguish between the
1001 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
1002 * aggressively from the ext4 function in question, with a
1003 * more appropriate error code.
1005 ext4_lock_group(sb
, grp
);
1009 void ext4_mark_group_bitmap_corrupted(struct super_block
*sb
,
1013 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1014 struct ext4_group_info
*grp
= ext4_get_group_info(sb
, group
);
1015 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, group
, NULL
);
1018 if (flags
& EXT4_GROUP_INFO_BBITMAP_CORRUPT
) {
1019 ret
= ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT
,
1022 percpu_counter_sub(&sbi
->s_freeclusters_counter
,
1026 if (flags
& EXT4_GROUP_INFO_IBITMAP_CORRUPT
) {
1027 ret
= ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT
,
1032 count
= ext4_free_inodes_count(sb
, gdp
);
1033 percpu_counter_sub(&sbi
->s_freeinodes_counter
,
1039 void ext4_update_dynamic_rev(struct super_block
*sb
)
1041 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
1043 if (le32_to_cpu(es
->s_rev_level
) > EXT4_GOOD_OLD_REV
)
1047 "updating to rev %d because of new feature flag, "
1048 "running e2fsck is recommended",
1051 es
->s_first_ino
= cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO
);
1052 es
->s_inode_size
= cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE
);
1053 es
->s_rev_level
= cpu_to_le32(EXT4_DYNAMIC_REV
);
1054 /* leave es->s_feature_*compat flags alone */
1055 /* es->s_uuid will be set by e2fsck if empty */
1058 * The rest of the superblock fields should be zero, and if not it
1059 * means they are likely already in use, so leave them alone. We
1060 * can leave it up to e2fsck to clean up any inconsistencies there.
1065 * Open the external journal device
1067 static struct block_device
*ext4_blkdev_get(dev_t dev
, struct super_block
*sb
)
1069 struct block_device
*bdev
;
1071 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
, sb
);
1077 ext4_msg(sb
, KERN_ERR
,
1078 "failed to open journal device unknown-block(%u,%u) %ld",
1079 MAJOR(dev
), MINOR(dev
), PTR_ERR(bdev
));
1084 * Release the journal device
1086 static void ext4_blkdev_put(struct block_device
*bdev
)
1088 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
1091 static void ext4_blkdev_remove(struct ext4_sb_info
*sbi
)
1093 struct block_device
*bdev
;
1094 bdev
= sbi
->s_journal_bdev
;
1096 ext4_blkdev_put(bdev
);
1097 sbi
->s_journal_bdev
= NULL
;
1101 static inline struct inode
*orphan_list_entry(struct list_head
*l
)
1103 return &list_entry(l
, struct ext4_inode_info
, i_orphan
)->vfs_inode
;
1106 static void dump_orphan_list(struct super_block
*sb
, struct ext4_sb_info
*sbi
)
1108 struct list_head
*l
;
1110 ext4_msg(sb
, KERN_ERR
, "sb orphan head is %d",
1111 le32_to_cpu(sbi
->s_es
->s_last_orphan
));
1113 printk(KERN_ERR
"sb_info orphan list:\n");
1114 list_for_each(l
, &sbi
->s_orphan
) {
1115 struct inode
*inode
= orphan_list_entry(l
);
1117 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
1118 inode
->i_sb
->s_id
, inode
->i_ino
, inode
,
1119 inode
->i_mode
, inode
->i_nlink
,
1120 NEXT_ORPHAN(inode
));
1125 static int ext4_quota_off(struct super_block
*sb
, int type
);
1127 static inline void ext4_quota_off_umount(struct super_block
*sb
)
1131 /* Use our quota_off function to clear inode flags etc. */
1132 for (type
= 0; type
< EXT4_MAXQUOTAS
; type
++)
1133 ext4_quota_off(sb
, type
);
1137 * This is a helper function which is used in the mount/remount
1138 * codepaths (which holds s_umount) to fetch the quota file name.
1140 static inline char *get_qf_name(struct super_block
*sb
,
1141 struct ext4_sb_info
*sbi
,
1144 return rcu_dereference_protected(sbi
->s_qf_names
[type
],
1145 lockdep_is_held(&sb
->s_umount
));
1148 static inline void ext4_quota_off_umount(struct super_block
*sb
)
1153 static void ext4_put_super(struct super_block
*sb
)
1155 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1156 struct ext4_super_block
*es
= sbi
->s_es
;
1157 struct buffer_head
**group_desc
;
1158 struct flex_groups
**flex_groups
;
1162 ext4_unregister_li_request(sb
);
1163 ext4_quota_off_umount(sb
);
1165 flush_work(&sbi
->s_error_work
);
1166 destroy_workqueue(sbi
->rsv_conversion_wq
);
1169 * Unregister sysfs before destroying jbd2 journal.
1170 * Since we could still access attr_journal_task attribute via sysfs
1171 * path which could have sbi->s_journal->j_task as NULL
1173 ext4_unregister_sysfs(sb
);
1175 if (sbi
->s_journal
) {
1176 aborted
= is_journal_aborted(sbi
->s_journal
);
1177 err
= jbd2_journal_destroy(sbi
->s_journal
);
1178 sbi
->s_journal
= NULL
;
1179 if ((err
< 0) && !aborted
) {
1180 ext4_abort(sb
, -err
, "Couldn't clean up the journal");
1184 ext4_es_unregister_shrinker(sbi
);
1185 del_timer_sync(&sbi
->s_err_report
);
1186 ext4_release_system_zone(sb
);
1187 ext4_mb_release(sb
);
1188 ext4_ext_release(sb
);
1190 if (!sb_rdonly(sb
) && !aborted
) {
1191 ext4_clear_feature_journal_needs_recovery(sb
);
1192 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
1195 ext4_commit_super(sb
);
1198 group_desc
= rcu_dereference(sbi
->s_group_desc
);
1199 for (i
= 0; i
< sbi
->s_gdb_count
; i
++)
1200 brelse(group_desc
[i
]);
1202 flex_groups
= rcu_dereference(sbi
->s_flex_groups
);
1204 for (i
= 0; i
< sbi
->s_flex_groups_allocated
; i
++)
1205 kvfree(flex_groups
[i
]);
1206 kvfree(flex_groups
);
1209 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
1210 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
1211 percpu_counter_destroy(&sbi
->s_dirs_counter
);
1212 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
1213 percpu_free_rwsem(&sbi
->s_writepages_rwsem
);
1215 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
1216 kfree(get_qf_name(sb
, sbi
, i
));
1219 /* Debugging code just in case the in-memory inode orphan list
1220 * isn't empty. The on-disk one can be non-empty if we've
1221 * detected an error and taken the fs readonly, but the
1222 * in-memory list had better be clean by this point. */
1223 if (!list_empty(&sbi
->s_orphan
))
1224 dump_orphan_list(sb
, sbi
);
1225 ASSERT(list_empty(&sbi
->s_orphan
));
1227 sync_blockdev(sb
->s_bdev
);
1228 invalidate_bdev(sb
->s_bdev
);
1229 if (sbi
->s_journal_bdev
&& sbi
->s_journal_bdev
!= sb
->s_bdev
) {
1231 * Invalidate the journal device's buffers. We don't want them
1232 * floating about in memory - the physical journal device may
1233 * hotswapped, and it breaks the `ro-after' testing code.
1235 sync_blockdev(sbi
->s_journal_bdev
);
1236 invalidate_bdev(sbi
->s_journal_bdev
);
1237 ext4_blkdev_remove(sbi
);
1240 ext4_xattr_destroy_cache(sbi
->s_ea_inode_cache
);
1241 sbi
->s_ea_inode_cache
= NULL
;
1243 ext4_xattr_destroy_cache(sbi
->s_ea_block_cache
);
1244 sbi
->s_ea_block_cache
= NULL
;
1247 kthread_stop(sbi
->s_mmp_tsk
);
1249 sb
->s_fs_info
= NULL
;
1251 * Now that we are completely done shutting down the
1252 * superblock, we need to actually destroy the kobject.
1254 kobject_put(&sbi
->s_kobj
);
1255 wait_for_completion(&sbi
->s_kobj_unregister
);
1256 if (sbi
->s_chksum_driver
)
1257 crypto_free_shash(sbi
->s_chksum_driver
);
1258 kfree(sbi
->s_blockgroup_lock
);
1259 fs_put_dax(sbi
->s_daxdev
);
1260 fscrypt_free_dummy_policy(&sbi
->s_dummy_enc_policy
);
1261 #ifdef CONFIG_UNICODE
1262 utf8_unload(sb
->s_encoding
);
1267 static struct kmem_cache
*ext4_inode_cachep
;
1270 * Called inside transaction, so use GFP_NOFS
1272 static struct inode
*ext4_alloc_inode(struct super_block
*sb
)
1274 struct ext4_inode_info
*ei
;
1276 ei
= kmem_cache_alloc(ext4_inode_cachep
, GFP_NOFS
);
1280 inode_set_iversion(&ei
->vfs_inode
, 1);
1281 spin_lock_init(&ei
->i_raw_lock
);
1282 INIT_LIST_HEAD(&ei
->i_prealloc_list
);
1283 atomic_set(&ei
->i_prealloc_active
, 0);
1284 spin_lock_init(&ei
->i_prealloc_lock
);
1285 ext4_es_init_tree(&ei
->i_es_tree
);
1286 rwlock_init(&ei
->i_es_lock
);
1287 INIT_LIST_HEAD(&ei
->i_es_list
);
1288 ei
->i_es_all_nr
= 0;
1289 ei
->i_es_shk_nr
= 0;
1290 ei
->i_es_shrink_lblk
= 0;
1291 ei
->i_reserved_data_blocks
= 0;
1292 spin_lock_init(&(ei
->i_block_reservation_lock
));
1293 ext4_init_pending_tree(&ei
->i_pending_tree
);
1295 ei
->i_reserved_quota
= 0;
1296 memset(&ei
->i_dquot
, 0, sizeof(ei
->i_dquot
));
1299 INIT_LIST_HEAD(&ei
->i_rsv_conversion_list
);
1300 spin_lock_init(&ei
->i_completed_io_lock
);
1302 ei
->i_datasync_tid
= 0;
1303 atomic_set(&ei
->i_unwritten
, 0);
1304 INIT_WORK(&ei
->i_rsv_conversion_work
, ext4_end_io_rsv_work
);
1305 ext4_fc_init_inode(&ei
->vfs_inode
);
1306 mutex_init(&ei
->i_fc_lock
);
1307 return &ei
->vfs_inode
;
1310 static int ext4_drop_inode(struct inode
*inode
)
1312 int drop
= generic_drop_inode(inode
);
1315 drop
= fscrypt_drop_inode(inode
);
1317 trace_ext4_drop_inode(inode
, drop
);
1321 static void ext4_free_in_core_inode(struct inode
*inode
)
1323 fscrypt_free_inode(inode
);
1324 if (!list_empty(&(EXT4_I(inode
)->i_fc_list
))) {
1325 pr_warn("%s: inode %ld still in fc list",
1326 __func__
, inode
->i_ino
);
1328 kmem_cache_free(ext4_inode_cachep
, EXT4_I(inode
));
1331 static void ext4_destroy_inode(struct inode
*inode
)
1333 if (!list_empty(&(EXT4_I(inode
)->i_orphan
))) {
1334 ext4_msg(inode
->i_sb
, KERN_ERR
,
1335 "Inode %lu (%p): orphan list check failed!",
1336 inode
->i_ino
, EXT4_I(inode
));
1337 print_hex_dump(KERN_INFO
, "", DUMP_PREFIX_ADDRESS
, 16, 4,
1338 EXT4_I(inode
), sizeof(struct ext4_inode_info
),
1344 static void init_once(void *foo
)
1346 struct ext4_inode_info
*ei
= (struct ext4_inode_info
*) foo
;
1348 INIT_LIST_HEAD(&ei
->i_orphan
);
1349 init_rwsem(&ei
->xattr_sem
);
1350 init_rwsem(&ei
->i_data_sem
);
1351 init_rwsem(&ei
->i_mmap_sem
);
1352 inode_init_once(&ei
->vfs_inode
);
1353 ext4_fc_init_inode(&ei
->vfs_inode
);
1356 static int __init
init_inodecache(void)
1358 ext4_inode_cachep
= kmem_cache_create_usercopy("ext4_inode_cache",
1359 sizeof(struct ext4_inode_info
), 0,
1360 (SLAB_RECLAIM_ACCOUNT
|SLAB_MEM_SPREAD
|
1362 offsetof(struct ext4_inode_info
, i_data
),
1363 sizeof_field(struct ext4_inode_info
, i_data
),
1365 if (ext4_inode_cachep
== NULL
)
1370 static void destroy_inodecache(void)
1373 * Make sure all delayed rcu free inodes are flushed before we
1377 kmem_cache_destroy(ext4_inode_cachep
);
1380 void ext4_clear_inode(struct inode
*inode
)
1383 invalidate_inode_buffers(inode
);
1385 ext4_discard_preallocations(inode
, 0);
1386 ext4_es_remove_extent(inode
, 0, EXT_MAX_BLOCKS
);
1388 if (EXT4_I(inode
)->jinode
) {
1389 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode
),
1390 EXT4_I(inode
)->jinode
);
1391 jbd2_free_inode(EXT4_I(inode
)->jinode
);
1392 EXT4_I(inode
)->jinode
= NULL
;
1394 fscrypt_put_encryption_info(inode
);
1395 fsverity_cleanup_inode(inode
);
1398 static struct inode
*ext4_nfs_get_inode(struct super_block
*sb
,
1399 u64 ino
, u32 generation
)
1401 struct inode
*inode
;
1404 * Currently we don't know the generation for parent directory, so
1405 * a generation of 0 means "accept any"
1407 inode
= ext4_iget(sb
, ino
, EXT4_IGET_HANDLE
);
1409 return ERR_CAST(inode
);
1410 if (generation
&& inode
->i_generation
!= generation
) {
1412 return ERR_PTR(-ESTALE
);
1418 static struct dentry
*ext4_fh_to_dentry(struct super_block
*sb
, struct fid
*fid
,
1419 int fh_len
, int fh_type
)
1421 return generic_fh_to_dentry(sb
, fid
, fh_len
, fh_type
,
1422 ext4_nfs_get_inode
);
1425 static struct dentry
*ext4_fh_to_parent(struct super_block
*sb
, struct fid
*fid
,
1426 int fh_len
, int fh_type
)
1428 return generic_fh_to_parent(sb
, fid
, fh_len
, fh_type
,
1429 ext4_nfs_get_inode
);
1432 static int ext4_nfs_commit_metadata(struct inode
*inode
)
1434 struct writeback_control wbc
= {
1435 .sync_mode
= WB_SYNC_ALL
1438 trace_ext4_nfs_commit_metadata(inode
);
1439 return ext4_write_inode(inode
, &wbc
);
1443 * Try to release metadata pages (indirect blocks, directories) which are
1444 * mapped via the block device. Since these pages could have journal heads
1445 * which would prevent try_to_free_buffers() from freeing them, we must use
1446 * jbd2 layer's try_to_free_buffers() function to release them.
1448 static int bdev_try_to_free_page(struct super_block
*sb
, struct page
*page
,
1451 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
1453 WARN_ON(PageChecked(page
));
1454 if (!page_has_buffers(page
))
1457 return jbd2_journal_try_to_free_buffers(journal
, page
);
1459 return try_to_free_buffers(page
);
1462 #ifdef CONFIG_FS_ENCRYPTION
1463 static int ext4_get_context(struct inode
*inode
, void *ctx
, size_t len
)
1465 return ext4_xattr_get(inode
, EXT4_XATTR_INDEX_ENCRYPTION
,
1466 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT
, ctx
, len
);
1469 static int ext4_set_context(struct inode
*inode
, const void *ctx
, size_t len
,
1472 handle_t
*handle
= fs_data
;
1473 int res
, res2
, credits
, retries
= 0;
1476 * Encrypting the root directory is not allowed because e2fsck expects
1477 * lost+found to exist and be unencrypted, and encrypting the root
1478 * directory would imply encrypting the lost+found directory as well as
1479 * the filename "lost+found" itself.
1481 if (inode
->i_ino
== EXT4_ROOT_INO
)
1484 if (WARN_ON_ONCE(IS_DAX(inode
) && i_size_read(inode
)))
1487 if (ext4_test_inode_flag(inode
, EXT4_INODE_DAX
))
1490 res
= ext4_convert_inline_data(inode
);
1495 * If a journal handle was specified, then the encryption context is
1496 * being set on a new inode via inheritance and is part of a larger
1497 * transaction to create the inode. Otherwise the encryption context is
1498 * being set on an existing inode in its own transaction. Only in the
1499 * latter case should the "retry on ENOSPC" logic be used.
1503 res
= ext4_xattr_set_handle(handle
, inode
,
1504 EXT4_XATTR_INDEX_ENCRYPTION
,
1505 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT
,
1508 ext4_set_inode_flag(inode
, EXT4_INODE_ENCRYPT
);
1509 ext4_clear_inode_state(inode
,
1510 EXT4_STATE_MAY_INLINE_DATA
);
1512 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1513 * S_DAX may be disabled
1515 ext4_set_inode_flags(inode
, false);
1520 res
= dquot_initialize(inode
);
1524 res
= ext4_xattr_set_credits(inode
, len
, false /* is_create */,
1529 handle
= ext4_journal_start(inode
, EXT4_HT_MISC
, credits
);
1531 return PTR_ERR(handle
);
1533 res
= ext4_xattr_set_handle(handle
, inode
, EXT4_XATTR_INDEX_ENCRYPTION
,
1534 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT
,
1537 ext4_set_inode_flag(inode
, EXT4_INODE_ENCRYPT
);
1539 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1540 * S_DAX may be disabled
1542 ext4_set_inode_flags(inode
, false);
1543 res
= ext4_mark_inode_dirty(handle
, inode
);
1545 EXT4_ERROR_INODE(inode
, "Failed to mark inode dirty");
1547 res2
= ext4_journal_stop(handle
);
1549 if (res
== -ENOSPC
&& ext4_should_retry_alloc(inode
->i_sb
, &retries
))
1556 static const union fscrypt_policy
*ext4_get_dummy_policy(struct super_block
*sb
)
1558 return EXT4_SB(sb
)->s_dummy_enc_policy
.policy
;
1561 static bool ext4_has_stable_inodes(struct super_block
*sb
)
1563 return ext4_has_feature_stable_inodes(sb
);
1566 static void ext4_get_ino_and_lblk_bits(struct super_block
*sb
,
1567 int *ino_bits_ret
, int *lblk_bits_ret
)
1569 *ino_bits_ret
= 8 * sizeof(EXT4_SB(sb
)->s_es
->s_inodes_count
);
1570 *lblk_bits_ret
= 8 * sizeof(ext4_lblk_t
);
1573 static const struct fscrypt_operations ext4_cryptops
= {
1574 .key_prefix
= "ext4:",
1575 .get_context
= ext4_get_context
,
1576 .set_context
= ext4_set_context
,
1577 .get_dummy_policy
= ext4_get_dummy_policy
,
1578 .empty_dir
= ext4_empty_dir
,
1579 .max_namelen
= EXT4_NAME_LEN
,
1580 .has_stable_inodes
= ext4_has_stable_inodes
,
1581 .get_ino_and_lblk_bits
= ext4_get_ino_and_lblk_bits
,
1586 static const char * const quotatypes
[] = INITQFNAMES
;
1587 #define QTYPE2NAME(t) (quotatypes[t])
1589 static int ext4_write_dquot(struct dquot
*dquot
);
1590 static int ext4_acquire_dquot(struct dquot
*dquot
);
1591 static int ext4_release_dquot(struct dquot
*dquot
);
1592 static int ext4_mark_dquot_dirty(struct dquot
*dquot
);
1593 static int ext4_write_info(struct super_block
*sb
, int type
);
1594 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
1595 const struct path
*path
);
1596 static int ext4_quota_on_mount(struct super_block
*sb
, int type
);
1597 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
1598 size_t len
, loff_t off
);
1599 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
1600 const char *data
, size_t len
, loff_t off
);
1601 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
1602 unsigned int flags
);
1603 static int ext4_enable_quotas(struct super_block
*sb
);
1605 static struct dquot
**ext4_get_dquots(struct inode
*inode
)
1607 return EXT4_I(inode
)->i_dquot
;
1610 static const struct dquot_operations ext4_quota_operations
= {
1611 .get_reserved_space
= ext4_get_reserved_space
,
1612 .write_dquot
= ext4_write_dquot
,
1613 .acquire_dquot
= ext4_acquire_dquot
,
1614 .release_dquot
= ext4_release_dquot
,
1615 .mark_dirty
= ext4_mark_dquot_dirty
,
1616 .write_info
= ext4_write_info
,
1617 .alloc_dquot
= dquot_alloc
,
1618 .destroy_dquot
= dquot_destroy
,
1619 .get_projid
= ext4_get_projid
,
1620 .get_inode_usage
= ext4_get_inode_usage
,
1621 .get_next_id
= dquot_get_next_id
,
1624 static const struct quotactl_ops ext4_qctl_operations
= {
1625 .quota_on
= ext4_quota_on
,
1626 .quota_off
= ext4_quota_off
,
1627 .quota_sync
= dquot_quota_sync
,
1628 .get_state
= dquot_get_state
,
1629 .set_info
= dquot_set_dqinfo
,
1630 .get_dqblk
= dquot_get_dqblk
,
1631 .set_dqblk
= dquot_set_dqblk
,
1632 .get_nextdqblk
= dquot_get_next_dqblk
,
1636 static const struct super_operations ext4_sops
= {
1637 .alloc_inode
= ext4_alloc_inode
,
1638 .free_inode
= ext4_free_in_core_inode
,
1639 .destroy_inode
= ext4_destroy_inode
,
1640 .write_inode
= ext4_write_inode
,
1641 .dirty_inode
= ext4_dirty_inode
,
1642 .drop_inode
= ext4_drop_inode
,
1643 .evict_inode
= ext4_evict_inode
,
1644 .put_super
= ext4_put_super
,
1645 .sync_fs
= ext4_sync_fs
,
1646 .freeze_fs
= ext4_freeze
,
1647 .unfreeze_fs
= ext4_unfreeze
,
1648 .statfs
= ext4_statfs
,
1649 .remount_fs
= ext4_remount
,
1650 .show_options
= ext4_show_options
,
1652 .quota_read
= ext4_quota_read
,
1653 .quota_write
= ext4_quota_write
,
1654 .get_dquots
= ext4_get_dquots
,
1656 .bdev_try_to_free_page
= bdev_try_to_free_page
,
1659 static const struct export_operations ext4_export_ops
= {
1660 .fh_to_dentry
= ext4_fh_to_dentry
,
1661 .fh_to_parent
= ext4_fh_to_parent
,
1662 .get_parent
= ext4_get_parent
,
1663 .commit_metadata
= ext4_nfs_commit_metadata
,
1667 Opt_bsd_df
, Opt_minix_df
, Opt_grpid
, Opt_nogrpid
,
1668 Opt_resgid
, Opt_resuid
, Opt_sb
, Opt_err_cont
, Opt_err_panic
, Opt_err_ro
,
1669 Opt_nouid32
, Opt_debug
, Opt_removed
,
1670 Opt_user_xattr
, Opt_nouser_xattr
, Opt_acl
, Opt_noacl
,
1671 Opt_auto_da_alloc
, Opt_noauto_da_alloc
, Opt_noload
,
1672 Opt_commit
, Opt_min_batch_time
, Opt_max_batch_time
, Opt_journal_dev
,
1673 Opt_journal_path
, Opt_journal_checksum
, Opt_journal_async_commit
,
1674 Opt_abort
, Opt_data_journal
, Opt_data_ordered
, Opt_data_writeback
,
1675 Opt_data_err_abort
, Opt_data_err_ignore
, Opt_test_dummy_encryption
,
1677 Opt_usrjquota
, Opt_grpjquota
, Opt_offusrjquota
, Opt_offgrpjquota
,
1678 Opt_jqfmt_vfsold
, Opt_jqfmt_vfsv0
, Opt_jqfmt_vfsv1
, Opt_quota
,
1679 Opt_noquota
, Opt_barrier
, Opt_nobarrier
, Opt_err
,
1680 Opt_usrquota
, Opt_grpquota
, Opt_prjquota
, Opt_i_version
,
1681 Opt_dax
, Opt_dax_always
, Opt_dax_inode
, Opt_dax_never
,
1682 Opt_stripe
, Opt_delalloc
, Opt_nodelalloc
, Opt_warn_on_error
,
1683 Opt_nowarn_on_error
, Opt_mblk_io_submit
,
1684 Opt_lazytime
, Opt_nolazytime
, Opt_debug_want_extra_isize
,
1685 Opt_nomblk_io_submit
, Opt_block_validity
, Opt_noblock_validity
,
1686 Opt_inode_readahead_blks
, Opt_journal_ioprio
,
1687 Opt_dioread_nolock
, Opt_dioread_lock
,
1688 Opt_discard
, Opt_nodiscard
, Opt_init_itable
, Opt_noinit_itable
,
1689 Opt_max_dir_size_kb
, Opt_nojournal_checksum
, Opt_nombcache
,
1690 Opt_prefetch_block_bitmaps
,
1691 #ifdef CONFIG_EXT4_DEBUG
1692 Opt_fc_debug_max_replay
, Opt_fc_debug_force
1696 static const match_table_t tokens
= {
1697 {Opt_bsd_df
, "bsddf"},
1698 {Opt_minix_df
, "minixdf"},
1699 {Opt_grpid
, "grpid"},
1700 {Opt_grpid
, "bsdgroups"},
1701 {Opt_nogrpid
, "nogrpid"},
1702 {Opt_nogrpid
, "sysvgroups"},
1703 {Opt_resgid
, "resgid=%u"},
1704 {Opt_resuid
, "resuid=%u"},
1706 {Opt_err_cont
, "errors=continue"},
1707 {Opt_err_panic
, "errors=panic"},
1708 {Opt_err_ro
, "errors=remount-ro"},
1709 {Opt_nouid32
, "nouid32"},
1710 {Opt_debug
, "debug"},
1711 {Opt_removed
, "oldalloc"},
1712 {Opt_removed
, "orlov"},
1713 {Opt_user_xattr
, "user_xattr"},
1714 {Opt_nouser_xattr
, "nouser_xattr"},
1716 {Opt_noacl
, "noacl"},
1717 {Opt_noload
, "norecovery"},
1718 {Opt_noload
, "noload"},
1719 {Opt_removed
, "nobh"},
1720 {Opt_removed
, "bh"},
1721 {Opt_commit
, "commit=%u"},
1722 {Opt_min_batch_time
, "min_batch_time=%u"},
1723 {Opt_max_batch_time
, "max_batch_time=%u"},
1724 {Opt_journal_dev
, "journal_dev=%u"},
1725 {Opt_journal_path
, "journal_path=%s"},
1726 {Opt_journal_checksum
, "journal_checksum"},
1727 {Opt_nojournal_checksum
, "nojournal_checksum"},
1728 {Opt_journal_async_commit
, "journal_async_commit"},
1729 {Opt_abort
, "abort"},
1730 {Opt_data_journal
, "data=journal"},
1731 {Opt_data_ordered
, "data=ordered"},
1732 {Opt_data_writeback
, "data=writeback"},
1733 {Opt_data_err_abort
, "data_err=abort"},
1734 {Opt_data_err_ignore
, "data_err=ignore"},
1735 {Opt_offusrjquota
, "usrjquota="},
1736 {Opt_usrjquota
, "usrjquota=%s"},
1737 {Opt_offgrpjquota
, "grpjquota="},
1738 {Opt_grpjquota
, "grpjquota=%s"},
1739 {Opt_jqfmt_vfsold
, "jqfmt=vfsold"},
1740 {Opt_jqfmt_vfsv0
, "jqfmt=vfsv0"},
1741 {Opt_jqfmt_vfsv1
, "jqfmt=vfsv1"},
1742 {Opt_grpquota
, "grpquota"},
1743 {Opt_noquota
, "noquota"},
1744 {Opt_quota
, "quota"},
1745 {Opt_usrquota
, "usrquota"},
1746 {Opt_prjquota
, "prjquota"},
1747 {Opt_barrier
, "barrier=%u"},
1748 {Opt_barrier
, "barrier"},
1749 {Opt_nobarrier
, "nobarrier"},
1750 {Opt_i_version
, "i_version"},
1752 {Opt_dax_always
, "dax=always"},
1753 {Opt_dax_inode
, "dax=inode"},
1754 {Opt_dax_never
, "dax=never"},
1755 {Opt_stripe
, "stripe=%u"},
1756 {Opt_delalloc
, "delalloc"},
1757 {Opt_warn_on_error
, "warn_on_error"},
1758 {Opt_nowarn_on_error
, "nowarn_on_error"},
1759 {Opt_lazytime
, "lazytime"},
1760 {Opt_nolazytime
, "nolazytime"},
1761 {Opt_debug_want_extra_isize
, "debug_want_extra_isize=%u"},
1762 {Opt_nodelalloc
, "nodelalloc"},
1763 {Opt_removed
, "mblk_io_submit"},
1764 {Opt_removed
, "nomblk_io_submit"},
1765 {Opt_block_validity
, "block_validity"},
1766 {Opt_noblock_validity
, "noblock_validity"},
1767 {Opt_inode_readahead_blks
, "inode_readahead_blks=%u"},
1768 {Opt_journal_ioprio
, "journal_ioprio=%u"},
1769 {Opt_auto_da_alloc
, "auto_da_alloc=%u"},
1770 {Opt_auto_da_alloc
, "auto_da_alloc"},
1771 {Opt_noauto_da_alloc
, "noauto_da_alloc"},
1772 {Opt_dioread_nolock
, "dioread_nolock"},
1773 {Opt_dioread_lock
, "nodioread_nolock"},
1774 {Opt_dioread_lock
, "dioread_lock"},
1775 {Opt_discard
, "discard"},
1776 {Opt_nodiscard
, "nodiscard"},
1777 {Opt_init_itable
, "init_itable=%u"},
1778 {Opt_init_itable
, "init_itable"},
1779 {Opt_noinit_itable
, "noinit_itable"},
1780 #ifdef CONFIG_EXT4_DEBUG
1781 {Opt_fc_debug_force
, "fc_debug_force"},
1782 {Opt_fc_debug_max_replay
, "fc_debug_max_replay=%u"},
1784 {Opt_max_dir_size_kb
, "max_dir_size_kb=%u"},
1785 {Opt_test_dummy_encryption
, "test_dummy_encryption=%s"},
1786 {Opt_test_dummy_encryption
, "test_dummy_encryption"},
1787 {Opt_inlinecrypt
, "inlinecrypt"},
1788 {Opt_nombcache
, "nombcache"},
1789 {Opt_nombcache
, "no_mbcache"}, /* for backward compatibility */
1790 {Opt_prefetch_block_bitmaps
, "prefetch_block_bitmaps"},
1791 {Opt_removed
, "check=none"}, /* mount option from ext2/3 */
1792 {Opt_removed
, "nocheck"}, /* mount option from ext2/3 */
1793 {Opt_removed
, "reservation"}, /* mount option from ext2/3 */
1794 {Opt_removed
, "noreservation"}, /* mount option from ext2/3 */
1795 {Opt_removed
, "journal=%u"}, /* mount option from ext2/3 */
1799 static ext4_fsblk_t
get_sb_block(void **data
)
1801 ext4_fsblk_t sb_block
;
1802 char *options
= (char *) *data
;
1804 if (!options
|| strncmp(options
, "sb=", 3) != 0)
1805 return 1; /* Default location */
1808 /* TODO: use simple_strtoll with >32bit ext4 */
1809 sb_block
= simple_strtoul(options
, &options
, 0);
1810 if (*options
&& *options
!= ',') {
1811 printk(KERN_ERR
"EXT4-fs: Invalid sb specification: %s\n",
1815 if (*options
== ',')
1817 *data
= (void *) options
;
1822 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1823 static const char deprecated_msg
[] =
1824 "Mount option \"%s\" will be removed by %s\n"
1825 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1828 static int set_qf_name(struct super_block
*sb
, int qtype
, substring_t
*args
)
1830 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1831 char *qname
, *old_qname
= get_qf_name(sb
, sbi
, qtype
);
1834 if (sb_any_quota_loaded(sb
) && !old_qname
) {
1835 ext4_msg(sb
, KERN_ERR
,
1836 "Cannot change journaled "
1837 "quota options when quota turned on");
1840 if (ext4_has_feature_quota(sb
)) {
1841 ext4_msg(sb
, KERN_INFO
, "Journaled quota options "
1842 "ignored when QUOTA feature is enabled");
1845 qname
= match_strdup(args
);
1847 ext4_msg(sb
, KERN_ERR
,
1848 "Not enough memory for storing quotafile name");
1852 if (strcmp(old_qname
, qname
) == 0)
1855 ext4_msg(sb
, KERN_ERR
,
1856 "%s quota file already specified",
1860 if (strchr(qname
, '/')) {
1861 ext4_msg(sb
, KERN_ERR
,
1862 "quotafile must be on filesystem root");
1865 rcu_assign_pointer(sbi
->s_qf_names
[qtype
], qname
);
1873 static int clear_qf_name(struct super_block
*sb
, int qtype
)
1876 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
1877 char *old_qname
= get_qf_name(sb
, sbi
, qtype
);
1879 if (sb_any_quota_loaded(sb
) && old_qname
) {
1880 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled quota options"
1881 " when quota turned on");
1884 rcu_assign_pointer(sbi
->s_qf_names
[qtype
], NULL
);
1891 #define MOPT_SET 0x0001
1892 #define MOPT_CLEAR 0x0002
1893 #define MOPT_NOSUPPORT 0x0004
1894 #define MOPT_EXPLICIT 0x0008
1895 #define MOPT_CLEAR_ERR 0x0010
1896 #define MOPT_GTE0 0x0020
1899 #define MOPT_QFMT 0x0040
1901 #define MOPT_Q MOPT_NOSUPPORT
1902 #define MOPT_QFMT MOPT_NOSUPPORT
1904 #define MOPT_DATAJ 0x0080
1905 #define MOPT_NO_EXT2 0x0100
1906 #define MOPT_NO_EXT3 0x0200
1907 #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1908 #define MOPT_STRING 0x0400
1909 #define MOPT_SKIP 0x0800
1910 #define MOPT_2 0x1000
1912 static const struct mount_opts
{
1916 } ext4_mount_opts
[] = {
1917 {Opt_minix_df
, EXT4_MOUNT_MINIX_DF
, MOPT_SET
},
1918 {Opt_bsd_df
, EXT4_MOUNT_MINIX_DF
, MOPT_CLEAR
},
1919 {Opt_grpid
, EXT4_MOUNT_GRPID
, MOPT_SET
},
1920 {Opt_nogrpid
, EXT4_MOUNT_GRPID
, MOPT_CLEAR
},
1921 {Opt_block_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_SET
},
1922 {Opt_noblock_validity
, EXT4_MOUNT_BLOCK_VALIDITY
, MOPT_CLEAR
},
1923 {Opt_dioread_nolock
, EXT4_MOUNT_DIOREAD_NOLOCK
,
1924 MOPT_EXT4_ONLY
| MOPT_SET
},
1925 {Opt_dioread_lock
, EXT4_MOUNT_DIOREAD_NOLOCK
,
1926 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1927 {Opt_discard
, EXT4_MOUNT_DISCARD
, MOPT_SET
},
1928 {Opt_nodiscard
, EXT4_MOUNT_DISCARD
, MOPT_CLEAR
},
1929 {Opt_delalloc
, EXT4_MOUNT_DELALLOC
,
1930 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1931 {Opt_nodelalloc
, EXT4_MOUNT_DELALLOC
,
1932 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1933 {Opt_warn_on_error
, EXT4_MOUNT_WARN_ON_ERROR
, MOPT_SET
},
1934 {Opt_nowarn_on_error
, EXT4_MOUNT_WARN_ON_ERROR
, MOPT_CLEAR
},
1935 {Opt_nojournal_checksum
, EXT4_MOUNT_JOURNAL_CHECKSUM
,
1936 MOPT_EXT4_ONLY
| MOPT_CLEAR
},
1937 {Opt_journal_checksum
, EXT4_MOUNT_JOURNAL_CHECKSUM
,
1938 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1939 {Opt_journal_async_commit
, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT
|
1940 EXT4_MOUNT_JOURNAL_CHECKSUM
),
1941 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_EXPLICIT
},
1942 {Opt_noload
, EXT4_MOUNT_NOLOAD
, MOPT_NO_EXT2
| MOPT_SET
},
1943 {Opt_err_panic
, EXT4_MOUNT_ERRORS_PANIC
, MOPT_SET
| MOPT_CLEAR_ERR
},
1944 {Opt_err_ro
, EXT4_MOUNT_ERRORS_RO
, MOPT_SET
| MOPT_CLEAR_ERR
},
1945 {Opt_err_cont
, EXT4_MOUNT_ERRORS_CONT
, MOPT_SET
| MOPT_CLEAR_ERR
},
1946 {Opt_data_err_abort
, EXT4_MOUNT_DATA_ERR_ABORT
,
1948 {Opt_data_err_ignore
, EXT4_MOUNT_DATA_ERR_ABORT
,
1950 {Opt_barrier
, EXT4_MOUNT_BARRIER
, MOPT_SET
},
1951 {Opt_nobarrier
, EXT4_MOUNT_BARRIER
, MOPT_CLEAR
},
1952 {Opt_noauto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_SET
},
1953 {Opt_auto_da_alloc
, EXT4_MOUNT_NO_AUTO_DA_ALLOC
, MOPT_CLEAR
},
1954 {Opt_noinit_itable
, EXT4_MOUNT_INIT_INODE_TABLE
, MOPT_CLEAR
},
1955 {Opt_commit
, 0, MOPT_GTE0
},
1956 {Opt_max_batch_time
, 0, MOPT_GTE0
},
1957 {Opt_min_batch_time
, 0, MOPT_GTE0
},
1958 {Opt_inode_readahead_blks
, 0, MOPT_GTE0
},
1959 {Opt_init_itable
, 0, MOPT_GTE0
},
1960 {Opt_dax
, EXT4_MOUNT_DAX_ALWAYS
, MOPT_SET
| MOPT_SKIP
},
1961 {Opt_dax_always
, EXT4_MOUNT_DAX_ALWAYS
,
1962 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_SKIP
},
1963 {Opt_dax_inode
, EXT4_MOUNT2_DAX_INODE
,
1964 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_SKIP
},
1965 {Opt_dax_never
, EXT4_MOUNT2_DAX_NEVER
,
1966 MOPT_EXT4_ONLY
| MOPT_SET
| MOPT_SKIP
},
1967 {Opt_stripe
, 0, MOPT_GTE0
},
1968 {Opt_resuid
, 0, MOPT_GTE0
},
1969 {Opt_resgid
, 0, MOPT_GTE0
},
1970 {Opt_journal_dev
, 0, MOPT_NO_EXT2
| MOPT_GTE0
},
1971 {Opt_journal_path
, 0, MOPT_NO_EXT2
| MOPT_STRING
},
1972 {Opt_journal_ioprio
, 0, MOPT_NO_EXT2
| MOPT_GTE0
},
1973 {Opt_data_journal
, EXT4_MOUNT_JOURNAL_DATA
, MOPT_NO_EXT2
| MOPT_DATAJ
},
1974 {Opt_data_ordered
, EXT4_MOUNT_ORDERED_DATA
, MOPT_NO_EXT2
| MOPT_DATAJ
},
1975 {Opt_data_writeback
, EXT4_MOUNT_WRITEBACK_DATA
,
1976 MOPT_NO_EXT2
| MOPT_DATAJ
},
1977 {Opt_user_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_SET
},
1978 {Opt_nouser_xattr
, EXT4_MOUNT_XATTR_USER
, MOPT_CLEAR
},
1979 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1980 {Opt_acl
, EXT4_MOUNT_POSIX_ACL
, MOPT_SET
},
1981 {Opt_noacl
, EXT4_MOUNT_POSIX_ACL
, MOPT_CLEAR
},
1983 {Opt_acl
, 0, MOPT_NOSUPPORT
},
1984 {Opt_noacl
, 0, MOPT_NOSUPPORT
},
1986 {Opt_nouid32
, EXT4_MOUNT_NO_UID32
, MOPT_SET
},
1987 {Opt_debug
, EXT4_MOUNT_DEBUG
, MOPT_SET
},
1988 {Opt_debug_want_extra_isize
, 0, MOPT_GTE0
},
1989 {Opt_quota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
, MOPT_SET
| MOPT_Q
},
1990 {Opt_usrquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
,
1992 {Opt_grpquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_GRPQUOTA
,
1994 {Opt_prjquota
, EXT4_MOUNT_QUOTA
| EXT4_MOUNT_PRJQUOTA
,
1996 {Opt_noquota
, (EXT4_MOUNT_QUOTA
| EXT4_MOUNT_USRQUOTA
|
1997 EXT4_MOUNT_GRPQUOTA
| EXT4_MOUNT_PRJQUOTA
),
1998 MOPT_CLEAR
| MOPT_Q
},
1999 {Opt_usrjquota
, 0, MOPT_Q
| MOPT_STRING
},
2000 {Opt_grpjquota
, 0, MOPT_Q
| MOPT_STRING
},
2001 {Opt_offusrjquota
, 0, MOPT_Q
},
2002 {Opt_offgrpjquota
, 0, MOPT_Q
},
2003 {Opt_jqfmt_vfsold
, QFMT_VFS_OLD
, MOPT_QFMT
},
2004 {Opt_jqfmt_vfsv0
, QFMT_VFS_V0
, MOPT_QFMT
},
2005 {Opt_jqfmt_vfsv1
, QFMT_VFS_V1
, MOPT_QFMT
},
2006 {Opt_max_dir_size_kb
, 0, MOPT_GTE0
},
2007 {Opt_test_dummy_encryption
, 0, MOPT_STRING
},
2008 {Opt_nombcache
, EXT4_MOUNT_NO_MBCACHE
, MOPT_SET
},
2009 {Opt_prefetch_block_bitmaps
, EXT4_MOUNT_PREFETCH_BLOCK_BITMAPS
,
2011 #ifdef CONFIG_EXT4_DEBUG
2012 {Opt_fc_debug_force
, EXT4_MOUNT2_JOURNAL_FAST_COMMIT
,
2013 MOPT_SET
| MOPT_2
| MOPT_EXT4_ONLY
},
2014 {Opt_fc_debug_max_replay
, 0, MOPT_GTE0
},
2019 #ifdef CONFIG_UNICODE
2020 static const struct ext4_sb_encodings
{
2024 } ext4_sb_encoding_map
[] = {
2025 {EXT4_ENC_UTF8_12_1
, "utf8", "12.1.0"},
2028 static int ext4_sb_read_encoding(const struct ext4_super_block
*es
,
2029 const struct ext4_sb_encodings
**encoding
,
2032 __u16 magic
= le16_to_cpu(es
->s_encoding
);
2035 for (i
= 0; i
< ARRAY_SIZE(ext4_sb_encoding_map
); i
++)
2036 if (magic
== ext4_sb_encoding_map
[i
].magic
)
2039 if (i
>= ARRAY_SIZE(ext4_sb_encoding_map
))
2042 *encoding
= &ext4_sb_encoding_map
[i
];
2043 *flags
= le16_to_cpu(es
->s_encoding_flags
);
2049 static int ext4_set_test_dummy_encryption(struct super_block
*sb
,
2051 const substring_t
*arg
,
2054 #ifdef CONFIG_FS_ENCRYPTION
2055 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2059 * This mount option is just for testing, and it's not worthwhile to
2060 * implement the extra complexity (e.g. RCU protection) that would be
2061 * needed to allow it to be set or changed during remount. We do allow
2062 * it to be specified during remount, but only if there is no change.
2064 if (is_remount
&& !sbi
->s_dummy_enc_policy
.policy
) {
2065 ext4_msg(sb
, KERN_WARNING
,
2066 "Can't set test_dummy_encryption on remount");
2069 err
= fscrypt_set_test_dummy_encryption(sb
, arg
->from
,
2070 &sbi
->s_dummy_enc_policy
);
2073 ext4_msg(sb
, KERN_WARNING
,
2074 "Can't change test_dummy_encryption on remount");
2075 else if (err
== -EINVAL
)
2076 ext4_msg(sb
, KERN_WARNING
,
2077 "Value of option \"%s\" is unrecognized", opt
);
2079 ext4_msg(sb
, KERN_WARNING
,
2080 "Error processing option \"%s\" [%d]",
2084 ext4_msg(sb
, KERN_WARNING
, "Test dummy encryption mode enabled");
2086 ext4_msg(sb
, KERN_WARNING
,
2087 "Test dummy encryption mount option ignored");
2092 static int handle_mount_opt(struct super_block
*sb
, char *opt
, int token
,
2093 substring_t
*args
, unsigned long *journal_devnum
,
2094 unsigned int *journal_ioprio
, int is_remount
)
2096 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2097 const struct mount_opts
*m
;
2103 if (token
== Opt_usrjquota
)
2104 return set_qf_name(sb
, USRQUOTA
, &args
[0]);
2105 else if (token
== Opt_grpjquota
)
2106 return set_qf_name(sb
, GRPQUOTA
, &args
[0]);
2107 else if (token
== Opt_offusrjquota
)
2108 return clear_qf_name(sb
, USRQUOTA
);
2109 else if (token
== Opt_offgrpjquota
)
2110 return clear_qf_name(sb
, GRPQUOTA
);
2114 case Opt_nouser_xattr
:
2115 ext4_msg(sb
, KERN_WARNING
, deprecated_msg
, opt
, "3.5");
2118 return 1; /* handled by get_sb_block() */
2120 ext4_msg(sb
, KERN_WARNING
, "Ignoring removed %s option", opt
);
2123 ext4_set_mount_flag(sb
, EXT4_MF_FS_ABORTED
);
2126 sb
->s_flags
|= SB_I_VERSION
;
2129 sb
->s_flags
|= SB_LAZYTIME
;
2131 case Opt_nolazytime
:
2132 sb
->s_flags
&= ~SB_LAZYTIME
;
2134 case Opt_inlinecrypt
:
2135 #ifdef CONFIG_FS_ENCRYPTION_INLINE_CRYPT
2136 sb
->s_flags
|= SB_INLINECRYPT
;
2138 ext4_msg(sb
, KERN_ERR
, "inline encryption not supported");
2143 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++)
2144 if (token
== m
->token
)
2147 if (m
->token
== Opt_err
) {
2148 ext4_msg(sb
, KERN_ERR
, "Unrecognized mount option \"%s\" "
2149 "or missing value", opt
);
2153 if ((m
->flags
& MOPT_NO_EXT2
) && IS_EXT2_SB(sb
)) {
2154 ext4_msg(sb
, KERN_ERR
,
2155 "Mount option \"%s\" incompatible with ext2", opt
);
2158 if ((m
->flags
& MOPT_NO_EXT3
) && IS_EXT3_SB(sb
)) {
2159 ext4_msg(sb
, KERN_ERR
,
2160 "Mount option \"%s\" incompatible with ext3", opt
);
2164 if (args
->from
&& !(m
->flags
& MOPT_STRING
) && match_int(args
, &arg
))
2166 if (args
->from
&& (m
->flags
& MOPT_GTE0
) && (arg
< 0))
2168 if (m
->flags
& MOPT_EXPLICIT
) {
2169 if (m
->mount_opt
& EXT4_MOUNT_DELALLOC
) {
2170 set_opt2(sb
, EXPLICIT_DELALLOC
);
2171 } else if (m
->mount_opt
& EXT4_MOUNT_JOURNAL_CHECKSUM
) {
2172 set_opt2(sb
, EXPLICIT_JOURNAL_CHECKSUM
);
2176 if (m
->flags
& MOPT_CLEAR_ERR
)
2177 clear_opt(sb
, ERRORS_MASK
);
2178 if (token
== Opt_noquota
&& sb_any_quota_loaded(sb
)) {
2179 ext4_msg(sb
, KERN_ERR
, "Cannot change quota "
2180 "options when quota turned on");
2184 if (m
->flags
& MOPT_NOSUPPORT
) {
2185 ext4_msg(sb
, KERN_ERR
, "%s option not supported", opt
);
2186 } else if (token
== Opt_commit
) {
2188 arg
= JBD2_DEFAULT_MAX_COMMIT_AGE
;
2189 else if (arg
> INT_MAX
/ HZ
) {
2190 ext4_msg(sb
, KERN_ERR
,
2191 "Invalid commit interval %d, "
2192 "must be smaller than %d",
2196 sbi
->s_commit_interval
= HZ
* arg
;
2197 } else if (token
== Opt_debug_want_extra_isize
) {
2200 (arg
> (sbi
->s_inode_size
- EXT4_GOOD_OLD_INODE_SIZE
))) {
2201 ext4_msg(sb
, KERN_ERR
,
2202 "Invalid want_extra_isize %d", arg
);
2205 sbi
->s_want_extra_isize
= arg
;
2206 } else if (token
== Opt_max_batch_time
) {
2207 sbi
->s_max_batch_time
= arg
;
2208 } else if (token
== Opt_min_batch_time
) {
2209 sbi
->s_min_batch_time
= arg
;
2210 } else if (token
== Opt_inode_readahead_blks
) {
2211 if (arg
&& (arg
> (1 << 30) || !is_power_of_2(arg
))) {
2212 ext4_msg(sb
, KERN_ERR
,
2213 "EXT4-fs: inode_readahead_blks must be "
2214 "0 or a power of 2 smaller than 2^31");
2217 sbi
->s_inode_readahead_blks
= arg
;
2218 } else if (token
== Opt_init_itable
) {
2219 set_opt(sb
, INIT_INODE_TABLE
);
2221 arg
= EXT4_DEF_LI_WAIT_MULT
;
2222 sbi
->s_li_wait_mult
= arg
;
2223 } else if (token
== Opt_max_dir_size_kb
) {
2224 sbi
->s_max_dir_size_kb
= arg
;
2225 #ifdef CONFIG_EXT4_DEBUG
2226 } else if (token
== Opt_fc_debug_max_replay
) {
2227 sbi
->s_fc_debug_max_replay
= arg
;
2229 } else if (token
== Opt_stripe
) {
2230 sbi
->s_stripe
= arg
;
2231 } else if (token
== Opt_resuid
) {
2232 uid
= make_kuid(current_user_ns(), arg
);
2233 if (!uid_valid(uid
)) {
2234 ext4_msg(sb
, KERN_ERR
, "Invalid uid value %d", arg
);
2237 sbi
->s_resuid
= uid
;
2238 } else if (token
== Opt_resgid
) {
2239 gid
= make_kgid(current_user_ns(), arg
);
2240 if (!gid_valid(gid
)) {
2241 ext4_msg(sb
, KERN_ERR
, "Invalid gid value %d", arg
);
2244 sbi
->s_resgid
= gid
;
2245 } else if (token
== Opt_journal_dev
) {
2247 ext4_msg(sb
, KERN_ERR
,
2248 "Cannot specify journal on remount");
2251 *journal_devnum
= arg
;
2252 } else if (token
== Opt_journal_path
) {
2254 struct inode
*journal_inode
;
2259 ext4_msg(sb
, KERN_ERR
,
2260 "Cannot specify journal on remount");
2263 journal_path
= match_strdup(&args
[0]);
2264 if (!journal_path
) {
2265 ext4_msg(sb
, KERN_ERR
, "error: could not dup "
2266 "journal device string");
2270 error
= kern_path(journal_path
, LOOKUP_FOLLOW
, &path
);
2272 ext4_msg(sb
, KERN_ERR
, "error: could not find "
2273 "journal device path: error %d", error
);
2274 kfree(journal_path
);
2278 journal_inode
= d_inode(path
.dentry
);
2279 if (!S_ISBLK(journal_inode
->i_mode
)) {
2280 ext4_msg(sb
, KERN_ERR
, "error: journal path %s "
2281 "is not a block device", journal_path
);
2283 kfree(journal_path
);
2287 *journal_devnum
= new_encode_dev(journal_inode
->i_rdev
);
2289 kfree(journal_path
);
2290 } else if (token
== Opt_journal_ioprio
) {
2292 ext4_msg(sb
, KERN_ERR
, "Invalid journal IO priority"
2297 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE
, arg
);
2298 } else if (token
== Opt_test_dummy_encryption
) {
2299 return ext4_set_test_dummy_encryption(sb
, opt
, &args
[0],
2301 } else if (m
->flags
& MOPT_DATAJ
) {
2303 if (!sbi
->s_journal
)
2304 ext4_msg(sb
, KERN_WARNING
, "Remounting file system with no journal so ignoring journalled data option");
2305 else if (test_opt(sb
, DATA_FLAGS
) != m
->mount_opt
) {
2306 ext4_msg(sb
, KERN_ERR
,
2307 "Cannot change data mode on remount");
2311 clear_opt(sb
, DATA_FLAGS
);
2312 sbi
->s_mount_opt
|= m
->mount_opt
;
2315 } else if (m
->flags
& MOPT_QFMT
) {
2316 if (sb_any_quota_loaded(sb
) &&
2317 sbi
->s_jquota_fmt
!= m
->mount_opt
) {
2318 ext4_msg(sb
, KERN_ERR
, "Cannot change journaled "
2319 "quota options when quota turned on");
2322 if (ext4_has_feature_quota(sb
)) {
2323 ext4_msg(sb
, KERN_INFO
,
2324 "Quota format mount options ignored "
2325 "when QUOTA feature is enabled");
2328 sbi
->s_jquota_fmt
= m
->mount_opt
;
2330 } else if (token
== Opt_dax
|| token
== Opt_dax_always
||
2331 token
== Opt_dax_inode
|| token
== Opt_dax_never
) {
2332 #ifdef CONFIG_FS_DAX
2335 case Opt_dax_always
:
2337 (!(sbi
->s_mount_opt
& EXT4_MOUNT_DAX_ALWAYS
) ||
2338 (sbi
->s_mount_opt2
& EXT4_MOUNT2_DAX_NEVER
))) {
2339 fail_dax_change_remount
:
2340 ext4_msg(sb
, KERN_ERR
, "can't change "
2341 "dax mount option while remounting");
2345 (test_opt(sb
, DATA_FLAGS
) ==
2346 EXT4_MOUNT_JOURNAL_DATA
)) {
2347 ext4_msg(sb
, KERN_ERR
, "can't mount with "
2348 "both data=journal and dax");
2351 ext4_msg(sb
, KERN_WARNING
,
2352 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
2353 sbi
->s_mount_opt
|= EXT4_MOUNT_DAX_ALWAYS
;
2354 sbi
->s_mount_opt2
&= ~EXT4_MOUNT2_DAX_NEVER
;
2358 (!(sbi
->s_mount_opt2
& EXT4_MOUNT2_DAX_NEVER
) ||
2359 (sbi
->s_mount_opt
& EXT4_MOUNT_DAX_ALWAYS
)))
2360 goto fail_dax_change_remount
;
2361 sbi
->s_mount_opt2
|= EXT4_MOUNT2_DAX_NEVER
;
2362 sbi
->s_mount_opt
&= ~EXT4_MOUNT_DAX_ALWAYS
;
2366 ((sbi
->s_mount_opt
& EXT4_MOUNT_DAX_ALWAYS
) ||
2367 (sbi
->s_mount_opt2
& EXT4_MOUNT2_DAX_NEVER
) ||
2368 !(sbi
->s_mount_opt2
& EXT4_MOUNT2_DAX_INODE
)))
2369 goto fail_dax_change_remount
;
2370 sbi
->s_mount_opt
&= ~EXT4_MOUNT_DAX_ALWAYS
;
2371 sbi
->s_mount_opt2
&= ~EXT4_MOUNT2_DAX_NEVER
;
2372 /* Strictly for printing options */
2373 sbi
->s_mount_opt2
|= EXT4_MOUNT2_DAX_INODE
;
2377 ext4_msg(sb
, KERN_INFO
, "dax option not supported");
2378 sbi
->s_mount_opt2
|= EXT4_MOUNT2_DAX_NEVER
;
2379 sbi
->s_mount_opt
&= ~EXT4_MOUNT_DAX_ALWAYS
;
2382 } else if (token
== Opt_data_err_abort
) {
2383 sbi
->s_mount_opt
|= m
->mount_opt
;
2384 } else if (token
== Opt_data_err_ignore
) {
2385 sbi
->s_mount_opt
&= ~m
->mount_opt
;
2389 if (m
->flags
& MOPT_CLEAR
)
2391 else if (unlikely(!(m
->flags
& MOPT_SET
))) {
2392 ext4_msg(sb
, KERN_WARNING
,
2393 "buggy handling of option %s", opt
);
2397 if (m
->flags
& MOPT_2
) {
2399 sbi
->s_mount_opt2
|= m
->mount_opt
;
2401 sbi
->s_mount_opt2
&= ~m
->mount_opt
;
2404 sbi
->s_mount_opt
|= m
->mount_opt
;
2406 sbi
->s_mount_opt
&= ~m
->mount_opt
;
2412 static int parse_options(char *options
, struct super_block
*sb
,
2413 unsigned long *journal_devnum
,
2414 unsigned int *journal_ioprio
,
2417 struct ext4_sb_info __maybe_unused
*sbi
= EXT4_SB(sb
);
2418 char *p
, __maybe_unused
*usr_qf_name
, __maybe_unused
*grp_qf_name
;
2419 substring_t args
[MAX_OPT_ARGS
];
2425 while ((p
= strsep(&options
, ",")) != NULL
) {
2429 * Initialize args struct so we know whether arg was
2430 * found; some options take optional arguments.
2432 args
[0].to
= args
[0].from
= NULL
;
2433 token
= match_token(p
, tokens
, args
);
2434 if (handle_mount_opt(sb
, p
, token
, args
, journal_devnum
,
2435 journal_ioprio
, is_remount
) < 0)
2440 * We do the test below only for project quotas. 'usrquota' and
2441 * 'grpquota' mount options are allowed even without quota feature
2442 * to support legacy quotas in quota files.
2444 if (test_opt(sb
, PRJQUOTA
) && !ext4_has_feature_project(sb
)) {
2445 ext4_msg(sb
, KERN_ERR
, "Project quota feature not enabled. "
2446 "Cannot enable project quota enforcement.");
2449 usr_qf_name
= get_qf_name(sb
, sbi
, USRQUOTA
);
2450 grp_qf_name
= get_qf_name(sb
, sbi
, GRPQUOTA
);
2451 if (usr_qf_name
|| grp_qf_name
) {
2452 if (test_opt(sb
, USRQUOTA
) && usr_qf_name
)
2453 clear_opt(sb
, USRQUOTA
);
2455 if (test_opt(sb
, GRPQUOTA
) && grp_qf_name
)
2456 clear_opt(sb
, GRPQUOTA
);
2458 if (test_opt(sb
, GRPQUOTA
) || test_opt(sb
, USRQUOTA
)) {
2459 ext4_msg(sb
, KERN_ERR
, "old and new quota "
2464 if (!sbi
->s_jquota_fmt
) {
2465 ext4_msg(sb
, KERN_ERR
, "journaled quota format "
2471 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
2473 BLOCK_SIZE
<< le32_to_cpu(sbi
->s_es
->s_log_block_size
);
2474 if (blocksize
< PAGE_SIZE
)
2475 ext4_msg(sb
, KERN_WARNING
, "Warning: mounting with an "
2476 "experimental mount option 'dioread_nolock' "
2477 "for blocksize < PAGE_SIZE");
2482 static inline void ext4_show_quota_options(struct seq_file
*seq
,
2483 struct super_block
*sb
)
2485 #if defined(CONFIG_QUOTA)
2486 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2487 char *usr_qf_name
, *grp_qf_name
;
2489 if (sbi
->s_jquota_fmt
) {
2492 switch (sbi
->s_jquota_fmt
) {
2503 seq_printf(seq
, ",jqfmt=%s", fmtname
);
2507 usr_qf_name
= rcu_dereference(sbi
->s_qf_names
[USRQUOTA
]);
2508 grp_qf_name
= rcu_dereference(sbi
->s_qf_names
[GRPQUOTA
]);
2510 seq_show_option(seq
, "usrjquota", usr_qf_name
);
2512 seq_show_option(seq
, "grpjquota", grp_qf_name
);
2517 static const char *token2str(int token
)
2519 const struct match_token
*t
;
2521 for (t
= tokens
; t
->token
!= Opt_err
; t
++)
2522 if (t
->token
== token
&& !strchr(t
->pattern
, '='))
2529 * - it's set to a non-default value OR
2530 * - if the per-sb default is different from the global default
2532 static int _ext4_show_options(struct seq_file
*seq
, struct super_block
*sb
,
2535 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2536 struct ext4_super_block
*es
= sbi
->s_es
;
2537 int def_errors
, def_mount_opt
= sbi
->s_def_mount_opt
;
2538 const struct mount_opts
*m
;
2539 char sep
= nodefs
? '\n' : ',';
2541 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2542 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2544 if (sbi
->s_sb_block
!= 1)
2545 SEQ_OPTS_PRINT("sb=%llu", sbi
->s_sb_block
);
2547 for (m
= ext4_mount_opts
; m
->token
!= Opt_err
; m
++) {
2548 int want_set
= m
->flags
& MOPT_SET
;
2549 if (((m
->flags
& (MOPT_SET
|MOPT_CLEAR
)) == 0) ||
2550 (m
->flags
& MOPT_CLEAR_ERR
) || m
->flags
& MOPT_SKIP
)
2552 if (!nodefs
&& !(m
->mount_opt
& (sbi
->s_mount_opt
^ def_mount_opt
)))
2553 continue; /* skip if same as the default */
2555 (sbi
->s_mount_opt
& m
->mount_opt
) != m
->mount_opt
) ||
2556 (!want_set
&& (sbi
->s_mount_opt
& m
->mount_opt
)))
2557 continue; /* select Opt_noFoo vs Opt_Foo */
2558 SEQ_OPTS_PRINT("%s", token2str(m
->token
));
2561 if (nodefs
|| !uid_eq(sbi
->s_resuid
, make_kuid(&init_user_ns
, EXT4_DEF_RESUID
)) ||
2562 le16_to_cpu(es
->s_def_resuid
) != EXT4_DEF_RESUID
)
2563 SEQ_OPTS_PRINT("resuid=%u",
2564 from_kuid_munged(&init_user_ns
, sbi
->s_resuid
));
2565 if (nodefs
|| !gid_eq(sbi
->s_resgid
, make_kgid(&init_user_ns
, EXT4_DEF_RESGID
)) ||
2566 le16_to_cpu(es
->s_def_resgid
) != EXT4_DEF_RESGID
)
2567 SEQ_OPTS_PRINT("resgid=%u",
2568 from_kgid_munged(&init_user_ns
, sbi
->s_resgid
));
2569 def_errors
= nodefs
? -1 : le16_to_cpu(es
->s_errors
);
2570 if (test_opt(sb
, ERRORS_RO
) && def_errors
!= EXT4_ERRORS_RO
)
2571 SEQ_OPTS_PUTS("errors=remount-ro");
2572 if (test_opt(sb
, ERRORS_CONT
) && def_errors
!= EXT4_ERRORS_CONTINUE
)
2573 SEQ_OPTS_PUTS("errors=continue");
2574 if (test_opt(sb
, ERRORS_PANIC
) && def_errors
!= EXT4_ERRORS_PANIC
)
2575 SEQ_OPTS_PUTS("errors=panic");
2576 if (nodefs
|| sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
)
2577 SEQ_OPTS_PRINT("commit=%lu", sbi
->s_commit_interval
/ HZ
);
2578 if (nodefs
|| sbi
->s_min_batch_time
!= EXT4_DEF_MIN_BATCH_TIME
)
2579 SEQ_OPTS_PRINT("min_batch_time=%u", sbi
->s_min_batch_time
);
2580 if (nodefs
|| sbi
->s_max_batch_time
!= EXT4_DEF_MAX_BATCH_TIME
)
2581 SEQ_OPTS_PRINT("max_batch_time=%u", sbi
->s_max_batch_time
);
2582 if (sb
->s_flags
& SB_I_VERSION
)
2583 SEQ_OPTS_PUTS("i_version");
2584 if (nodefs
|| sbi
->s_stripe
)
2585 SEQ_OPTS_PRINT("stripe=%lu", sbi
->s_stripe
);
2586 if (nodefs
|| EXT4_MOUNT_DATA_FLAGS
&
2587 (sbi
->s_mount_opt
^ def_mount_opt
)) {
2588 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
2589 SEQ_OPTS_PUTS("data=journal");
2590 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
2591 SEQ_OPTS_PUTS("data=ordered");
2592 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_WRITEBACK_DATA
)
2593 SEQ_OPTS_PUTS("data=writeback");
2596 sbi
->s_inode_readahead_blks
!= EXT4_DEF_INODE_READAHEAD_BLKS
)
2597 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2598 sbi
->s_inode_readahead_blks
);
2600 if (test_opt(sb
, INIT_INODE_TABLE
) && (nodefs
||
2601 (sbi
->s_li_wait_mult
!= EXT4_DEF_LI_WAIT_MULT
)))
2602 SEQ_OPTS_PRINT("init_itable=%u", sbi
->s_li_wait_mult
);
2603 if (nodefs
|| sbi
->s_max_dir_size_kb
)
2604 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi
->s_max_dir_size_kb
);
2605 if (test_opt(sb
, DATA_ERR_ABORT
))
2606 SEQ_OPTS_PUTS("data_err=abort");
2608 fscrypt_show_test_dummy_encryption(seq
, sep
, sb
);
2610 if (sb
->s_flags
& SB_INLINECRYPT
)
2611 SEQ_OPTS_PUTS("inlinecrypt");
2613 if (test_opt(sb
, DAX_ALWAYS
)) {
2615 SEQ_OPTS_PUTS("dax");
2617 SEQ_OPTS_PUTS("dax=always");
2618 } else if (test_opt2(sb
, DAX_NEVER
)) {
2619 SEQ_OPTS_PUTS("dax=never");
2620 } else if (test_opt2(sb
, DAX_INODE
)) {
2621 SEQ_OPTS_PUTS("dax=inode");
2623 ext4_show_quota_options(seq
, sb
);
2627 static int ext4_show_options(struct seq_file
*seq
, struct dentry
*root
)
2629 return _ext4_show_options(seq
, root
->d_sb
, 0);
2632 int ext4_seq_options_show(struct seq_file
*seq
, void *offset
)
2634 struct super_block
*sb
= seq
->private;
2637 seq_puts(seq
, sb_rdonly(sb
) ? "ro" : "rw");
2638 rc
= _ext4_show_options(seq
, sb
, 1);
2639 seq_puts(seq
, "\n");
2643 static int ext4_setup_super(struct super_block
*sb
, struct ext4_super_block
*es
,
2646 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2649 if (le32_to_cpu(es
->s_rev_level
) > EXT4_MAX_SUPP_REV
) {
2650 ext4_msg(sb
, KERN_ERR
, "revision level too high, "
2651 "forcing read-only mode");
2657 if (!(sbi
->s_mount_state
& EXT4_VALID_FS
))
2658 ext4_msg(sb
, KERN_WARNING
, "warning: mounting unchecked fs, "
2659 "running e2fsck is recommended");
2660 else if (sbi
->s_mount_state
& EXT4_ERROR_FS
)
2661 ext4_msg(sb
, KERN_WARNING
,
2662 "warning: mounting fs with errors, "
2663 "running e2fsck is recommended");
2664 else if ((__s16
) le16_to_cpu(es
->s_max_mnt_count
) > 0 &&
2665 le16_to_cpu(es
->s_mnt_count
) >=
2666 (unsigned short) (__s16
) le16_to_cpu(es
->s_max_mnt_count
))
2667 ext4_msg(sb
, KERN_WARNING
,
2668 "warning: maximal mount count reached, "
2669 "running e2fsck is recommended");
2670 else if (le32_to_cpu(es
->s_checkinterval
) &&
2671 (ext4_get_tstamp(es
, s_lastcheck
) +
2672 le32_to_cpu(es
->s_checkinterval
) <= ktime_get_real_seconds()))
2673 ext4_msg(sb
, KERN_WARNING
,
2674 "warning: checktime reached, "
2675 "running e2fsck is recommended");
2676 if (!sbi
->s_journal
)
2677 es
->s_state
&= cpu_to_le16(~EXT4_VALID_FS
);
2678 if (!(__s16
) le16_to_cpu(es
->s_max_mnt_count
))
2679 es
->s_max_mnt_count
= cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT
);
2680 le16_add_cpu(&es
->s_mnt_count
, 1);
2681 ext4_update_tstamp(es
, s_mtime
);
2683 ext4_set_feature_journal_needs_recovery(sb
);
2685 err
= ext4_commit_super(sb
);
2687 if (test_opt(sb
, DEBUG
))
2688 printk(KERN_INFO
"[EXT4 FS bs=%lu, gc=%u, "
2689 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
2691 sbi
->s_groups_count
,
2692 EXT4_BLOCKS_PER_GROUP(sb
),
2693 EXT4_INODES_PER_GROUP(sb
),
2694 sbi
->s_mount_opt
, sbi
->s_mount_opt2
);
2696 cleancache_init_fs(sb
);
2700 int ext4_alloc_flex_bg_array(struct super_block
*sb
, ext4_group_t ngroup
)
2702 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2703 struct flex_groups
**old_groups
, **new_groups
;
2706 if (!sbi
->s_log_groups_per_flex
)
2709 size
= ext4_flex_group(sbi
, ngroup
- 1) + 1;
2710 if (size
<= sbi
->s_flex_groups_allocated
)
2713 new_groups
= kvzalloc(roundup_pow_of_two(size
*
2714 sizeof(*sbi
->s_flex_groups
)), GFP_KERNEL
);
2716 ext4_msg(sb
, KERN_ERR
,
2717 "not enough memory for %d flex group pointers", size
);
2720 for (i
= sbi
->s_flex_groups_allocated
; i
< size
; i
++) {
2721 new_groups
[i
] = kvzalloc(roundup_pow_of_two(
2722 sizeof(struct flex_groups
)),
2724 if (!new_groups
[i
]) {
2725 for (j
= sbi
->s_flex_groups_allocated
; j
< i
; j
++)
2726 kvfree(new_groups
[j
]);
2728 ext4_msg(sb
, KERN_ERR
,
2729 "not enough memory for %d flex groups", size
);
2734 old_groups
= rcu_dereference(sbi
->s_flex_groups
);
2736 memcpy(new_groups
, old_groups
,
2737 (sbi
->s_flex_groups_allocated
*
2738 sizeof(struct flex_groups
*)));
2740 rcu_assign_pointer(sbi
->s_flex_groups
, new_groups
);
2741 sbi
->s_flex_groups_allocated
= size
;
2743 ext4_kvfree_array_rcu(old_groups
);
2747 static int ext4_fill_flex_info(struct super_block
*sb
)
2749 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2750 struct ext4_group_desc
*gdp
= NULL
;
2751 struct flex_groups
*fg
;
2752 ext4_group_t flex_group
;
2755 sbi
->s_log_groups_per_flex
= sbi
->s_es
->s_log_groups_per_flex
;
2756 if (sbi
->s_log_groups_per_flex
< 1 || sbi
->s_log_groups_per_flex
> 31) {
2757 sbi
->s_log_groups_per_flex
= 0;
2761 err
= ext4_alloc_flex_bg_array(sb
, sbi
->s_groups_count
);
2765 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
2766 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2768 flex_group
= ext4_flex_group(sbi
, i
);
2769 fg
= sbi_array_rcu_deref(sbi
, s_flex_groups
, flex_group
);
2770 atomic_add(ext4_free_inodes_count(sb
, gdp
), &fg
->free_inodes
);
2771 atomic64_add(ext4_free_group_clusters(sb
, gdp
),
2772 &fg
->free_clusters
);
2773 atomic_add(ext4_used_dirs_count(sb
, gdp
), &fg
->used_dirs
);
2781 static __le16
ext4_group_desc_csum(struct super_block
*sb
, __u32 block_group
,
2782 struct ext4_group_desc
*gdp
)
2784 int offset
= offsetof(struct ext4_group_desc
, bg_checksum
);
2786 __le32 le_group
= cpu_to_le32(block_group
);
2787 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2789 if (ext4_has_metadata_csum(sbi
->s_sb
)) {
2790 /* Use new metadata_csum algorithm */
2792 __u16 dummy_csum
= 0;
2794 csum32
= ext4_chksum(sbi
, sbi
->s_csum_seed
, (__u8
*)&le_group
,
2796 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)gdp
, offset
);
2797 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)&dummy_csum
,
2798 sizeof(dummy_csum
));
2799 offset
+= sizeof(dummy_csum
);
2800 if (offset
< sbi
->s_desc_size
)
2801 csum32
= ext4_chksum(sbi
, csum32
, (__u8
*)gdp
+ offset
,
2802 sbi
->s_desc_size
- offset
);
2804 crc
= csum32
& 0xFFFF;
2808 /* old crc16 code */
2809 if (!ext4_has_feature_gdt_csum(sb
))
2812 crc
= crc16(~0, sbi
->s_es
->s_uuid
, sizeof(sbi
->s_es
->s_uuid
));
2813 crc
= crc16(crc
, (__u8
*)&le_group
, sizeof(le_group
));
2814 crc
= crc16(crc
, (__u8
*)gdp
, offset
);
2815 offset
+= sizeof(gdp
->bg_checksum
); /* skip checksum */
2816 /* for checksum of struct ext4_group_desc do the rest...*/
2817 if (ext4_has_feature_64bit(sb
) &&
2818 offset
< le16_to_cpu(sbi
->s_es
->s_desc_size
))
2819 crc
= crc16(crc
, (__u8
*)gdp
+ offset
,
2820 le16_to_cpu(sbi
->s_es
->s_desc_size
) -
2824 return cpu_to_le16(crc
);
2827 int ext4_group_desc_csum_verify(struct super_block
*sb
, __u32 block_group
,
2828 struct ext4_group_desc
*gdp
)
2830 if (ext4_has_group_desc_csum(sb
) &&
2831 (gdp
->bg_checksum
!= ext4_group_desc_csum(sb
, block_group
, gdp
)))
2837 void ext4_group_desc_csum_set(struct super_block
*sb
, __u32 block_group
,
2838 struct ext4_group_desc
*gdp
)
2840 if (!ext4_has_group_desc_csum(sb
))
2842 gdp
->bg_checksum
= ext4_group_desc_csum(sb
, block_group
, gdp
);
2845 /* Called at mount-time, super-block is locked */
2846 static int ext4_check_descriptors(struct super_block
*sb
,
2847 ext4_fsblk_t sb_block
,
2848 ext4_group_t
*first_not_zeroed
)
2850 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2851 ext4_fsblk_t first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
);
2852 ext4_fsblk_t last_block
;
2853 ext4_fsblk_t last_bg_block
= sb_block
+ ext4_bg_num_gdb(sb
, 0);
2854 ext4_fsblk_t block_bitmap
;
2855 ext4_fsblk_t inode_bitmap
;
2856 ext4_fsblk_t inode_table
;
2857 int flexbg_flag
= 0;
2858 ext4_group_t i
, grp
= sbi
->s_groups_count
;
2860 if (ext4_has_feature_flex_bg(sb
))
2863 ext4_debug("Checking group descriptors");
2865 for (i
= 0; i
< sbi
->s_groups_count
; i
++) {
2866 struct ext4_group_desc
*gdp
= ext4_get_group_desc(sb
, i
, NULL
);
2868 if (i
== sbi
->s_groups_count
- 1 || flexbg_flag
)
2869 last_block
= ext4_blocks_count(sbi
->s_es
) - 1;
2871 last_block
= first_block
+
2872 (EXT4_BLOCKS_PER_GROUP(sb
) - 1);
2874 if ((grp
== sbi
->s_groups_count
) &&
2875 !(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
2878 block_bitmap
= ext4_block_bitmap(sb
, gdp
);
2879 if (block_bitmap
== sb_block
) {
2880 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2881 "Block bitmap for group %u overlaps "
2886 if (block_bitmap
>= sb_block
+ 1 &&
2887 block_bitmap
<= last_bg_block
) {
2888 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2889 "Block bitmap for group %u overlaps "
2890 "block group descriptors", i
);
2894 if (block_bitmap
< first_block
|| block_bitmap
> last_block
) {
2895 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2896 "Block bitmap for group %u not in group "
2897 "(block %llu)!", i
, block_bitmap
);
2900 inode_bitmap
= ext4_inode_bitmap(sb
, gdp
);
2901 if (inode_bitmap
== sb_block
) {
2902 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2903 "Inode bitmap for group %u overlaps "
2908 if (inode_bitmap
>= sb_block
+ 1 &&
2909 inode_bitmap
<= last_bg_block
) {
2910 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2911 "Inode bitmap for group %u overlaps "
2912 "block group descriptors", i
);
2916 if (inode_bitmap
< first_block
|| inode_bitmap
> last_block
) {
2917 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2918 "Inode bitmap for group %u not in group "
2919 "(block %llu)!", i
, inode_bitmap
);
2922 inode_table
= ext4_inode_table(sb
, gdp
);
2923 if (inode_table
== sb_block
) {
2924 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2925 "Inode table for group %u overlaps "
2930 if (inode_table
>= sb_block
+ 1 &&
2931 inode_table
<= last_bg_block
) {
2932 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2933 "Inode table for group %u overlaps "
2934 "block group descriptors", i
);
2938 if (inode_table
< first_block
||
2939 inode_table
+ sbi
->s_itb_per_group
- 1 > last_block
) {
2940 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2941 "Inode table for group %u not in group "
2942 "(block %llu)!", i
, inode_table
);
2945 ext4_lock_group(sb
, i
);
2946 if (!ext4_group_desc_csum_verify(sb
, i
, gdp
)) {
2947 ext4_msg(sb
, KERN_ERR
, "ext4_check_descriptors: "
2948 "Checksum for group %u failed (%u!=%u)",
2949 i
, le16_to_cpu(ext4_group_desc_csum(sb
, i
,
2950 gdp
)), le16_to_cpu(gdp
->bg_checksum
));
2951 if (!sb_rdonly(sb
)) {
2952 ext4_unlock_group(sb
, i
);
2956 ext4_unlock_group(sb
, i
);
2958 first_block
+= EXT4_BLOCKS_PER_GROUP(sb
);
2960 if (NULL
!= first_not_zeroed
)
2961 *first_not_zeroed
= grp
;
2965 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2966 * the superblock) which were deleted from all directories, but held open by
2967 * a process at the time of a crash. We walk the list and try to delete these
2968 * inodes at recovery time (only with a read-write filesystem).
2970 * In order to keep the orphan inode chain consistent during traversal (in
2971 * case of crash during recovery), we link each inode into the superblock
2972 * orphan list_head and handle it the same way as an inode deletion during
2973 * normal operation (which journals the operations for us).
2975 * We only do an iget() and an iput() on each inode, which is very safe if we
2976 * accidentally point at an in-use or already deleted inode. The worst that
2977 * can happen in this case is that we get a "bit already cleared" message from
2978 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2979 * e2fsck was run on this filesystem, and it must have already done the orphan
2980 * inode cleanup for us, so we can safely abort without any further action.
2982 static void ext4_orphan_cleanup(struct super_block
*sb
,
2983 struct ext4_super_block
*es
)
2985 unsigned int s_flags
= sb
->s_flags
;
2986 int ret
, nr_orphans
= 0, nr_truncates
= 0;
2988 int quota_update
= 0;
2991 if (!es
->s_last_orphan
) {
2992 jbd_debug(4, "no orphan inodes to clean up\n");
2996 if (bdev_read_only(sb
->s_bdev
)) {
2997 ext4_msg(sb
, KERN_ERR
, "write access "
2998 "unavailable, skipping orphan cleanup");
3002 /* Check if feature set would not allow a r/w mount */
3003 if (!ext4_feature_set_ok(sb
, 0)) {
3004 ext4_msg(sb
, KERN_INFO
, "Skipping orphan cleanup due to "
3005 "unknown ROCOMPAT features");
3009 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
3010 /* don't clear list on RO mount w/ errors */
3011 if (es
->s_last_orphan
&& !(s_flags
& SB_RDONLY
)) {
3012 ext4_msg(sb
, KERN_INFO
, "Errors on filesystem, "
3013 "clearing orphan list.\n");
3014 es
->s_last_orphan
= 0;
3016 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
3020 if (s_flags
& SB_RDONLY
) {
3021 ext4_msg(sb
, KERN_INFO
, "orphan cleanup on readonly fs");
3022 sb
->s_flags
&= ~SB_RDONLY
;
3025 /* Needed for iput() to work correctly and not trash data */
3026 sb
->s_flags
|= SB_ACTIVE
;
3029 * Turn on quotas which were not enabled for read-only mounts if
3030 * filesystem has quota feature, so that they are updated correctly.
3032 if (ext4_has_feature_quota(sb
) && (s_flags
& SB_RDONLY
)) {
3033 int ret
= ext4_enable_quotas(sb
);
3038 ext4_msg(sb
, KERN_ERR
,
3039 "Cannot turn on quotas: error %d", ret
);
3042 /* Turn on journaled quotas used for old sytle */
3043 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++) {
3044 if (EXT4_SB(sb
)->s_qf_names
[i
]) {
3045 int ret
= ext4_quota_on_mount(sb
, i
);
3050 ext4_msg(sb
, KERN_ERR
,
3051 "Cannot turn on journaled "
3052 "quota: type %d: error %d", i
, ret
);
3057 while (es
->s_last_orphan
) {
3058 struct inode
*inode
;
3061 * We may have encountered an error during cleanup; if
3062 * so, skip the rest.
3064 if (EXT4_SB(sb
)->s_mount_state
& EXT4_ERROR_FS
) {
3065 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
3066 es
->s_last_orphan
= 0;
3070 inode
= ext4_orphan_get(sb
, le32_to_cpu(es
->s_last_orphan
));
3071 if (IS_ERR(inode
)) {
3072 es
->s_last_orphan
= 0;
3076 list_add(&EXT4_I(inode
)->i_orphan
, &EXT4_SB(sb
)->s_orphan
);
3077 dquot_initialize(inode
);
3078 if (inode
->i_nlink
) {
3079 if (test_opt(sb
, DEBUG
))
3080 ext4_msg(sb
, KERN_DEBUG
,
3081 "%s: truncating inode %lu to %lld bytes",
3082 __func__
, inode
->i_ino
, inode
->i_size
);
3083 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
3084 inode
->i_ino
, inode
->i_size
);
3086 truncate_inode_pages(inode
->i_mapping
, inode
->i_size
);
3087 ret
= ext4_truncate(inode
);
3089 ext4_std_error(inode
->i_sb
, ret
);
3090 inode_unlock(inode
);
3093 if (test_opt(sb
, DEBUG
))
3094 ext4_msg(sb
, KERN_DEBUG
,
3095 "%s: deleting unreferenced inode %lu",
3096 __func__
, inode
->i_ino
);
3097 jbd_debug(2, "deleting unreferenced inode %lu\n",
3101 iput(inode
); /* The delete magic happens here! */
3104 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
3107 ext4_msg(sb
, KERN_INFO
, "%d orphan inode%s deleted",
3108 PLURAL(nr_orphans
));
3110 ext4_msg(sb
, KERN_INFO
, "%d truncate%s cleaned up",
3111 PLURAL(nr_truncates
));
3113 /* Turn off quotas if they were enabled for orphan cleanup */
3115 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++) {
3116 if (sb_dqopt(sb
)->files
[i
])
3117 dquot_quota_off(sb
, i
);
3121 sb
->s_flags
= s_flags
; /* Restore SB_RDONLY status */
3125 * Maximal extent format file size.
3126 * Resulting logical blkno at s_maxbytes must fit in our on-disk
3127 * extent format containers, within a sector_t, and within i_blocks
3128 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
3129 * so that won't be a limiting factor.
3131 * However there is other limiting factor. We do store extents in the form
3132 * of starting block and length, hence the resulting length of the extent
3133 * covering maximum file size must fit into on-disk format containers as
3134 * well. Given that length is always by 1 unit bigger than max unit (because
3135 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
3137 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
3139 static loff_t
ext4_max_size(int blkbits
, int has_huge_files
)
3142 loff_t upper_limit
= MAX_LFS_FILESIZE
;
3144 BUILD_BUG_ON(sizeof(blkcnt_t
) < sizeof(u64
));
3146 if (!has_huge_files
) {
3147 upper_limit
= (1LL << 32) - 1;
3149 /* total blocks in file system block size */
3150 upper_limit
>>= (blkbits
- 9);
3151 upper_limit
<<= blkbits
;
3155 * 32-bit extent-start container, ee_block. We lower the maxbytes
3156 * by one fs block, so ee_len can cover the extent of maximum file
3159 res
= (1LL << 32) - 1;
3162 /* Sanity check against vm- & vfs- imposed limits */
3163 if (res
> upper_limit
)
3170 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
3171 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
3172 * We need to be 1 filesystem block less than the 2^48 sector limit.
3174 static loff_t
ext4_max_bitmap_size(int bits
, int has_huge_files
)
3176 loff_t res
= EXT4_NDIR_BLOCKS
;
3179 /* This is calculated to be the largest file size for a dense, block
3180 * mapped file such that the file's total number of 512-byte sectors,
3181 * including data and all indirect blocks, does not exceed (2^48 - 1).
3183 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
3184 * number of 512-byte sectors of the file.
3187 if (!has_huge_files
) {
3189 * !has_huge_files or implies that the inode i_block field
3190 * represents total file blocks in 2^32 512-byte sectors ==
3191 * size of vfs inode i_blocks * 8
3193 upper_limit
= (1LL << 32) - 1;
3195 /* total blocks in file system block size */
3196 upper_limit
>>= (bits
- 9);
3200 * We use 48 bit ext4_inode i_blocks
3201 * With EXT4_HUGE_FILE_FL set the i_blocks
3202 * represent total number of blocks in
3203 * file system block size
3205 upper_limit
= (1LL << 48) - 1;
3209 /* indirect blocks */
3211 /* double indirect blocks */
3212 meta_blocks
+= 1 + (1LL << (bits
-2));
3213 /* tripple indirect blocks */
3214 meta_blocks
+= 1 + (1LL << (bits
-2)) + (1LL << (2*(bits
-2)));
3216 upper_limit
-= meta_blocks
;
3217 upper_limit
<<= bits
;
3219 res
+= 1LL << (bits
-2);
3220 res
+= 1LL << (2*(bits
-2));
3221 res
+= 1LL << (3*(bits
-2));
3223 if (res
> upper_limit
)
3226 if (res
> MAX_LFS_FILESIZE
)
3227 res
= MAX_LFS_FILESIZE
;
3232 static ext4_fsblk_t
descriptor_loc(struct super_block
*sb
,
3233 ext4_fsblk_t logical_sb_block
, int nr
)
3235 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3236 ext4_group_t bg
, first_meta_bg
;
3239 first_meta_bg
= le32_to_cpu(sbi
->s_es
->s_first_meta_bg
);
3241 if (!ext4_has_feature_meta_bg(sb
) || nr
< first_meta_bg
)
3242 return logical_sb_block
+ nr
+ 1;
3243 bg
= sbi
->s_desc_per_block
* nr
;
3244 if (ext4_bg_has_super(sb
, bg
))
3248 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
3249 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
3250 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
3253 if (sb
->s_blocksize
== 1024 && nr
== 0 &&
3254 le32_to_cpu(sbi
->s_es
->s_first_data_block
) == 0)
3257 return (has_super
+ ext4_group_first_block_no(sb
, bg
));
3261 * ext4_get_stripe_size: Get the stripe size.
3262 * @sbi: In memory super block info
3264 * If we have specified it via mount option, then
3265 * use the mount option value. If the value specified at mount time is
3266 * greater than the blocks per group use the super block value.
3267 * If the super block value is greater than blocks per group return 0.
3268 * Allocator needs it be less than blocks per group.
3271 static unsigned long ext4_get_stripe_size(struct ext4_sb_info
*sbi
)
3273 unsigned long stride
= le16_to_cpu(sbi
->s_es
->s_raid_stride
);
3274 unsigned long stripe_width
=
3275 le32_to_cpu(sbi
->s_es
->s_raid_stripe_width
);
3278 if (sbi
->s_stripe
&& sbi
->s_stripe
<= sbi
->s_blocks_per_group
)
3279 ret
= sbi
->s_stripe
;
3280 else if (stripe_width
&& stripe_width
<= sbi
->s_blocks_per_group
)
3282 else if (stride
&& stride
<= sbi
->s_blocks_per_group
)
3288 * If the stripe width is 1, this makes no sense and
3289 * we set it to 0 to turn off stripe handling code.
3298 * Check whether this filesystem can be mounted based on
3299 * the features present and the RDONLY/RDWR mount requested.
3300 * Returns 1 if this filesystem can be mounted as requested,
3301 * 0 if it cannot be.
3303 static int ext4_feature_set_ok(struct super_block
*sb
, int readonly
)
3305 if (ext4_has_unknown_ext4_incompat_features(sb
)) {
3306 ext4_msg(sb
, KERN_ERR
,
3307 "Couldn't mount because of "
3308 "unsupported optional features (%x)",
3309 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_incompat
) &
3310 ~EXT4_FEATURE_INCOMPAT_SUPP
));
3314 #ifndef CONFIG_UNICODE
3315 if (ext4_has_feature_casefold(sb
)) {
3316 ext4_msg(sb
, KERN_ERR
,
3317 "Filesystem with casefold feature cannot be "
3318 "mounted without CONFIG_UNICODE");
3326 if (ext4_has_feature_readonly(sb
)) {
3327 ext4_msg(sb
, KERN_INFO
, "filesystem is read-only");
3328 sb
->s_flags
|= SB_RDONLY
;
3332 /* Check that feature set is OK for a read-write mount */
3333 if (ext4_has_unknown_ext4_ro_compat_features(sb
)) {
3334 ext4_msg(sb
, KERN_ERR
, "couldn't mount RDWR because of "
3335 "unsupported optional features (%x)",
3336 (le32_to_cpu(EXT4_SB(sb
)->s_es
->s_feature_ro_compat
) &
3337 ~EXT4_FEATURE_RO_COMPAT_SUPP
));
3340 if (ext4_has_feature_bigalloc(sb
) && !ext4_has_feature_extents(sb
)) {
3341 ext4_msg(sb
, KERN_ERR
,
3342 "Can't support bigalloc feature without "
3343 "extents feature\n");
3347 #if !IS_ENABLED(CONFIG_QUOTA) || !IS_ENABLED(CONFIG_QFMT_V2)
3348 if (!readonly
&& (ext4_has_feature_quota(sb
) ||
3349 ext4_has_feature_project(sb
))) {
3350 ext4_msg(sb
, KERN_ERR
,
3351 "The kernel was not built with CONFIG_QUOTA and CONFIG_QFMT_V2");
3354 #endif /* CONFIG_QUOTA */
3359 * This function is called once a day if we have errors logged
3360 * on the file system
3362 static void print_daily_error_info(struct timer_list
*t
)
3364 struct ext4_sb_info
*sbi
= from_timer(sbi
, t
, s_err_report
);
3365 struct super_block
*sb
= sbi
->s_sb
;
3366 struct ext4_super_block
*es
= sbi
->s_es
;
3368 if (es
->s_error_count
)
3369 /* fsck newer than v1.41.13 is needed to clean this condition. */
3370 ext4_msg(sb
, KERN_NOTICE
, "error count since last fsck: %u",
3371 le32_to_cpu(es
->s_error_count
));
3372 if (es
->s_first_error_time
) {
3373 printk(KERN_NOTICE
"EXT4-fs (%s): initial error at time %llu: %.*s:%d",
3375 ext4_get_tstamp(es
, s_first_error_time
),
3376 (int) sizeof(es
->s_first_error_func
),
3377 es
->s_first_error_func
,
3378 le32_to_cpu(es
->s_first_error_line
));
3379 if (es
->s_first_error_ino
)
3380 printk(KERN_CONT
": inode %u",
3381 le32_to_cpu(es
->s_first_error_ino
));
3382 if (es
->s_first_error_block
)
3383 printk(KERN_CONT
": block %llu", (unsigned long long)
3384 le64_to_cpu(es
->s_first_error_block
));
3385 printk(KERN_CONT
"\n");
3387 if (es
->s_last_error_time
) {
3388 printk(KERN_NOTICE
"EXT4-fs (%s): last error at time %llu: %.*s:%d",
3390 ext4_get_tstamp(es
, s_last_error_time
),
3391 (int) sizeof(es
->s_last_error_func
),
3392 es
->s_last_error_func
,
3393 le32_to_cpu(es
->s_last_error_line
));
3394 if (es
->s_last_error_ino
)
3395 printk(KERN_CONT
": inode %u",
3396 le32_to_cpu(es
->s_last_error_ino
));
3397 if (es
->s_last_error_block
)
3398 printk(KERN_CONT
": block %llu", (unsigned long long)
3399 le64_to_cpu(es
->s_last_error_block
));
3400 printk(KERN_CONT
"\n");
3402 mod_timer(&sbi
->s_err_report
, jiffies
+ 24*60*60*HZ
); /* Once a day */
3405 /* Find next suitable group and run ext4_init_inode_table */
3406 static int ext4_run_li_request(struct ext4_li_request
*elr
)
3408 struct ext4_group_desc
*gdp
= NULL
;
3409 struct super_block
*sb
= elr
->lr_super
;
3410 ext4_group_t ngroups
= EXT4_SB(sb
)->s_groups_count
;
3411 ext4_group_t group
= elr
->lr_next_group
;
3412 unsigned long timeout
= 0;
3413 unsigned int prefetch_ios
= 0;
3416 if (elr
->lr_mode
== EXT4_LI_MODE_PREFETCH_BBITMAP
) {
3417 elr
->lr_next_group
= ext4_mb_prefetch(sb
, group
,
3418 EXT4_SB(sb
)->s_mb_prefetch
, &prefetch_ios
);
3420 ext4_mb_prefetch_fini(sb
, elr
->lr_next_group
,
3422 trace_ext4_prefetch_bitmaps(sb
, group
, elr
->lr_next_group
,
3424 if (group
>= elr
->lr_next_group
) {
3426 if (elr
->lr_first_not_zeroed
!= ngroups
&&
3427 !sb_rdonly(sb
) && test_opt(sb
, INIT_INODE_TABLE
)) {
3428 elr
->lr_next_group
= elr
->lr_first_not_zeroed
;
3429 elr
->lr_mode
= EXT4_LI_MODE_ITABLE
;
3436 for (; group
< ngroups
; group
++) {
3437 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
3443 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
3447 if (group
>= ngroups
)
3452 ret
= ext4_init_inode_table(sb
, group
,
3453 elr
->lr_timeout
? 0 : 1);
3454 trace_ext4_lazy_itable_init(sb
, group
);
3455 if (elr
->lr_timeout
== 0) {
3456 timeout
= (jiffies
- timeout
) *
3457 EXT4_SB(elr
->lr_super
)->s_li_wait_mult
;
3458 elr
->lr_timeout
= timeout
;
3460 elr
->lr_next_sched
= jiffies
+ elr
->lr_timeout
;
3461 elr
->lr_next_group
= group
+ 1;
3467 * Remove lr_request from the list_request and free the
3468 * request structure. Should be called with li_list_mtx held
3470 static void ext4_remove_li_request(struct ext4_li_request
*elr
)
3475 list_del(&elr
->lr_request
);
3476 EXT4_SB(elr
->lr_super
)->s_li_request
= NULL
;
3480 static void ext4_unregister_li_request(struct super_block
*sb
)
3482 mutex_lock(&ext4_li_mtx
);
3483 if (!ext4_li_info
) {
3484 mutex_unlock(&ext4_li_mtx
);
3488 mutex_lock(&ext4_li_info
->li_list_mtx
);
3489 ext4_remove_li_request(EXT4_SB(sb
)->s_li_request
);
3490 mutex_unlock(&ext4_li_info
->li_list_mtx
);
3491 mutex_unlock(&ext4_li_mtx
);
3494 static struct task_struct
*ext4_lazyinit_task
;
3497 * This is the function where ext4lazyinit thread lives. It walks
3498 * through the request list searching for next scheduled filesystem.
3499 * When such a fs is found, run the lazy initialization request
3500 * (ext4_rn_li_request) and keep track of the time spend in this
3501 * function. Based on that time we compute next schedule time of
3502 * the request. When walking through the list is complete, compute
3503 * next waking time and put itself into sleep.
3505 static int ext4_lazyinit_thread(void *arg
)
3507 struct ext4_lazy_init
*eli
= (struct ext4_lazy_init
*)arg
;
3508 struct list_head
*pos
, *n
;
3509 struct ext4_li_request
*elr
;
3510 unsigned long next_wakeup
, cur
;
3512 BUG_ON(NULL
== eli
);
3516 next_wakeup
= MAX_JIFFY_OFFSET
;
3518 mutex_lock(&eli
->li_list_mtx
);
3519 if (list_empty(&eli
->li_request_list
)) {
3520 mutex_unlock(&eli
->li_list_mtx
);
3523 list_for_each_safe(pos
, n
, &eli
->li_request_list
) {
3526 elr
= list_entry(pos
, struct ext4_li_request
,
3529 if (time_before(jiffies
, elr
->lr_next_sched
)) {
3530 if (time_before(elr
->lr_next_sched
, next_wakeup
))
3531 next_wakeup
= elr
->lr_next_sched
;
3534 if (down_read_trylock(&elr
->lr_super
->s_umount
)) {
3535 if (sb_start_write_trylock(elr
->lr_super
)) {
3538 * We hold sb->s_umount, sb can not
3539 * be removed from the list, it is
3540 * now safe to drop li_list_mtx
3542 mutex_unlock(&eli
->li_list_mtx
);
3543 err
= ext4_run_li_request(elr
);
3544 sb_end_write(elr
->lr_super
);
3545 mutex_lock(&eli
->li_list_mtx
);
3548 up_read((&elr
->lr_super
->s_umount
));
3550 /* error, remove the lazy_init job */
3552 ext4_remove_li_request(elr
);
3556 elr
->lr_next_sched
= jiffies
+
3558 % (EXT4_DEF_LI_MAX_START_DELAY
* HZ
));
3560 if (time_before(elr
->lr_next_sched
, next_wakeup
))
3561 next_wakeup
= elr
->lr_next_sched
;
3563 mutex_unlock(&eli
->li_list_mtx
);
3568 if ((time_after_eq(cur
, next_wakeup
)) ||
3569 (MAX_JIFFY_OFFSET
== next_wakeup
)) {
3574 schedule_timeout_interruptible(next_wakeup
- cur
);
3576 if (kthread_should_stop()) {
3577 ext4_clear_request_list();
3584 * It looks like the request list is empty, but we need
3585 * to check it under the li_list_mtx lock, to prevent any
3586 * additions into it, and of course we should lock ext4_li_mtx
3587 * to atomically free the list and ext4_li_info, because at
3588 * this point another ext4 filesystem could be registering
3591 mutex_lock(&ext4_li_mtx
);
3592 mutex_lock(&eli
->li_list_mtx
);
3593 if (!list_empty(&eli
->li_request_list
)) {
3594 mutex_unlock(&eli
->li_list_mtx
);
3595 mutex_unlock(&ext4_li_mtx
);
3598 mutex_unlock(&eli
->li_list_mtx
);
3599 kfree(ext4_li_info
);
3600 ext4_li_info
= NULL
;
3601 mutex_unlock(&ext4_li_mtx
);
3606 static void ext4_clear_request_list(void)
3608 struct list_head
*pos
, *n
;
3609 struct ext4_li_request
*elr
;
3611 mutex_lock(&ext4_li_info
->li_list_mtx
);
3612 list_for_each_safe(pos
, n
, &ext4_li_info
->li_request_list
) {
3613 elr
= list_entry(pos
, struct ext4_li_request
,
3615 ext4_remove_li_request(elr
);
3617 mutex_unlock(&ext4_li_info
->li_list_mtx
);
3620 static int ext4_run_lazyinit_thread(void)
3622 ext4_lazyinit_task
= kthread_run(ext4_lazyinit_thread
,
3623 ext4_li_info
, "ext4lazyinit");
3624 if (IS_ERR(ext4_lazyinit_task
)) {
3625 int err
= PTR_ERR(ext4_lazyinit_task
);
3626 ext4_clear_request_list();
3627 kfree(ext4_li_info
);
3628 ext4_li_info
= NULL
;
3629 printk(KERN_CRIT
"EXT4-fs: error %d creating inode table "
3630 "initialization thread\n",
3634 ext4_li_info
->li_state
|= EXT4_LAZYINIT_RUNNING
;
3639 * Check whether it make sense to run itable init. thread or not.
3640 * If there is at least one uninitialized inode table, return
3641 * corresponding group number, else the loop goes through all
3642 * groups and return total number of groups.
3644 static ext4_group_t
ext4_has_uninit_itable(struct super_block
*sb
)
3646 ext4_group_t group
, ngroups
= EXT4_SB(sb
)->s_groups_count
;
3647 struct ext4_group_desc
*gdp
= NULL
;
3649 if (!ext4_has_group_desc_csum(sb
))
3652 for (group
= 0; group
< ngroups
; group
++) {
3653 gdp
= ext4_get_group_desc(sb
, group
, NULL
);
3657 if (!(gdp
->bg_flags
& cpu_to_le16(EXT4_BG_INODE_ZEROED
)))
3664 static int ext4_li_info_new(void)
3666 struct ext4_lazy_init
*eli
= NULL
;
3668 eli
= kzalloc(sizeof(*eli
), GFP_KERNEL
);
3672 INIT_LIST_HEAD(&eli
->li_request_list
);
3673 mutex_init(&eli
->li_list_mtx
);
3675 eli
->li_state
|= EXT4_LAZYINIT_QUIT
;
3682 static struct ext4_li_request
*ext4_li_request_new(struct super_block
*sb
,
3685 struct ext4_li_request
*elr
;
3687 elr
= kzalloc(sizeof(*elr
), GFP_KERNEL
);
3692 elr
->lr_first_not_zeroed
= start
;
3693 if (test_opt(sb
, PREFETCH_BLOCK_BITMAPS
))
3694 elr
->lr_mode
= EXT4_LI_MODE_PREFETCH_BBITMAP
;
3696 elr
->lr_mode
= EXT4_LI_MODE_ITABLE
;
3697 elr
->lr_next_group
= start
;
3701 * Randomize first schedule time of the request to
3702 * spread the inode table initialization requests
3705 elr
->lr_next_sched
= jiffies
+ (prandom_u32() %
3706 (EXT4_DEF_LI_MAX_START_DELAY
* HZ
));
3710 int ext4_register_li_request(struct super_block
*sb
,
3711 ext4_group_t first_not_zeroed
)
3713 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3714 struct ext4_li_request
*elr
= NULL
;
3715 ext4_group_t ngroups
= sbi
->s_groups_count
;
3718 mutex_lock(&ext4_li_mtx
);
3719 if (sbi
->s_li_request
!= NULL
) {
3721 * Reset timeout so it can be computed again, because
3722 * s_li_wait_mult might have changed.
3724 sbi
->s_li_request
->lr_timeout
= 0;
3728 if (!test_opt(sb
, PREFETCH_BLOCK_BITMAPS
) &&
3729 (first_not_zeroed
== ngroups
|| sb_rdonly(sb
) ||
3730 !test_opt(sb
, INIT_INODE_TABLE
)))
3733 elr
= ext4_li_request_new(sb
, first_not_zeroed
);
3739 if (NULL
== ext4_li_info
) {
3740 ret
= ext4_li_info_new();
3745 mutex_lock(&ext4_li_info
->li_list_mtx
);
3746 list_add(&elr
->lr_request
, &ext4_li_info
->li_request_list
);
3747 mutex_unlock(&ext4_li_info
->li_list_mtx
);
3749 sbi
->s_li_request
= elr
;
3751 * set elr to NULL here since it has been inserted to
3752 * the request_list and the removal and free of it is
3753 * handled by ext4_clear_request_list from now on.
3757 if (!(ext4_li_info
->li_state
& EXT4_LAZYINIT_RUNNING
)) {
3758 ret
= ext4_run_lazyinit_thread();
3763 mutex_unlock(&ext4_li_mtx
);
3770 * We do not need to lock anything since this is called on
3773 static void ext4_destroy_lazyinit_thread(void)
3776 * If thread exited earlier
3777 * there's nothing to be done.
3779 if (!ext4_li_info
|| !ext4_lazyinit_task
)
3782 kthread_stop(ext4_lazyinit_task
);
3785 static int set_journal_csum_feature_set(struct super_block
*sb
)
3788 int compat
, incompat
;
3789 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3791 if (ext4_has_metadata_csum(sb
)) {
3792 /* journal checksum v3 */
3794 incompat
= JBD2_FEATURE_INCOMPAT_CSUM_V3
;
3796 /* journal checksum v1 */
3797 compat
= JBD2_FEATURE_COMPAT_CHECKSUM
;
3801 jbd2_journal_clear_features(sbi
->s_journal
,
3802 JBD2_FEATURE_COMPAT_CHECKSUM
, 0,
3803 JBD2_FEATURE_INCOMPAT_CSUM_V3
|
3804 JBD2_FEATURE_INCOMPAT_CSUM_V2
);
3805 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
3806 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3808 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
|
3810 } else if (test_opt(sb
, JOURNAL_CHECKSUM
)) {
3811 ret
= jbd2_journal_set_features(sbi
->s_journal
,
3814 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3815 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3817 jbd2_journal_clear_features(sbi
->s_journal
, 0, 0,
3818 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT
);
3825 * Note: calculating the overhead so we can be compatible with
3826 * historical BSD practice is quite difficult in the face of
3827 * clusters/bigalloc. This is because multiple metadata blocks from
3828 * different block group can end up in the same allocation cluster.
3829 * Calculating the exact overhead in the face of clustered allocation
3830 * requires either O(all block bitmaps) in memory or O(number of block
3831 * groups**2) in time. We will still calculate the superblock for
3832 * older file systems --- and if we come across with a bigalloc file
3833 * system with zero in s_overhead_clusters the estimate will be close to
3834 * correct especially for very large cluster sizes --- but for newer
3835 * file systems, it's better to calculate this figure once at mkfs
3836 * time, and store it in the superblock. If the superblock value is
3837 * present (even for non-bigalloc file systems), we will use it.
3839 static int count_overhead(struct super_block
*sb
, ext4_group_t grp
,
3842 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3843 struct ext4_group_desc
*gdp
;
3844 ext4_fsblk_t first_block
, last_block
, b
;
3845 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3846 int s
, j
, count
= 0;
3848 if (!ext4_has_feature_bigalloc(sb
))
3849 return (ext4_bg_has_super(sb
, grp
) + ext4_bg_num_gdb(sb
, grp
) +
3850 sbi
->s_itb_per_group
+ 2);
3852 first_block
= le32_to_cpu(sbi
->s_es
->s_first_data_block
) +
3853 (grp
* EXT4_BLOCKS_PER_GROUP(sb
));
3854 last_block
= first_block
+ EXT4_BLOCKS_PER_GROUP(sb
) - 1;
3855 for (i
= 0; i
< ngroups
; i
++) {
3856 gdp
= ext4_get_group_desc(sb
, i
, NULL
);
3857 b
= ext4_block_bitmap(sb
, gdp
);
3858 if (b
>= first_block
&& b
<= last_block
) {
3859 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3862 b
= ext4_inode_bitmap(sb
, gdp
);
3863 if (b
>= first_block
&& b
<= last_block
) {
3864 ext4_set_bit(EXT4_B2C(sbi
, b
- first_block
), buf
);
3867 b
= ext4_inode_table(sb
, gdp
);
3868 if (b
>= first_block
&& b
+ sbi
->s_itb_per_group
<= last_block
)
3869 for (j
= 0; j
< sbi
->s_itb_per_group
; j
++, b
++) {
3870 int c
= EXT4_B2C(sbi
, b
- first_block
);
3871 ext4_set_bit(c
, buf
);
3877 if (ext4_bg_has_super(sb
, grp
)) {
3878 ext4_set_bit(s
++, buf
);
3881 j
= ext4_bg_num_gdb(sb
, grp
);
3882 if (s
+ j
> EXT4_BLOCKS_PER_GROUP(sb
)) {
3883 ext4_error(sb
, "Invalid number of block group "
3884 "descriptor blocks: %d", j
);
3885 j
= EXT4_BLOCKS_PER_GROUP(sb
) - s
;
3889 ext4_set_bit(EXT4_B2C(sbi
, s
++), buf
);
3893 return EXT4_CLUSTERS_PER_GROUP(sb
) -
3894 ext4_count_free(buf
, EXT4_CLUSTERS_PER_GROUP(sb
) / 8);
3898 * Compute the overhead and stash it in sbi->s_overhead
3900 int ext4_calculate_overhead(struct super_block
*sb
)
3902 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3903 struct ext4_super_block
*es
= sbi
->s_es
;
3904 struct inode
*j_inode
;
3905 unsigned int j_blocks
, j_inum
= le32_to_cpu(es
->s_journal_inum
);
3906 ext4_group_t i
, ngroups
= ext4_get_groups_count(sb
);
3907 ext4_fsblk_t overhead
= 0;
3908 char *buf
= (char *) get_zeroed_page(GFP_NOFS
);
3914 * Compute the overhead (FS structures). This is constant
3915 * for a given filesystem unless the number of block groups
3916 * changes so we cache the previous value until it does.
3920 * All of the blocks before first_data_block are overhead
3922 overhead
= EXT4_B2C(sbi
, le32_to_cpu(es
->s_first_data_block
));
3925 * Add the overhead found in each block group
3927 for (i
= 0; i
< ngroups
; i
++) {
3930 blks
= count_overhead(sb
, i
, buf
);
3933 memset(buf
, 0, PAGE_SIZE
);
3938 * Add the internal journal blocks whether the journal has been
3941 if (sbi
->s_journal
&& !sbi
->s_journal_bdev
)
3942 overhead
+= EXT4_NUM_B2C(sbi
, sbi
->s_journal
->j_total_len
);
3943 else if (ext4_has_feature_journal(sb
) && !sbi
->s_journal
&& j_inum
) {
3944 /* j_inum for internal journal is non-zero */
3945 j_inode
= ext4_get_journal_inode(sb
, j_inum
);
3947 j_blocks
= j_inode
->i_size
>> sb
->s_blocksize_bits
;
3948 overhead
+= EXT4_NUM_B2C(sbi
, j_blocks
);
3951 ext4_msg(sb
, KERN_ERR
, "can't get journal size");
3954 sbi
->s_overhead
= overhead
;
3956 free_page((unsigned long) buf
);
3960 static void ext4_set_resv_clusters(struct super_block
*sb
)
3962 ext4_fsblk_t resv_clusters
;
3963 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
3966 * There's no need to reserve anything when we aren't using extents.
3967 * The space estimates are exact, there are no unwritten extents,
3968 * hole punching doesn't need new metadata... This is needed especially
3969 * to keep ext2/3 backward compatibility.
3971 if (!ext4_has_feature_extents(sb
))
3974 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3975 * This should cover the situations where we can not afford to run
3976 * out of space like for example punch hole, or converting
3977 * unwritten extents in delalloc path. In most cases such
3978 * allocation would require 1, or 2 blocks, higher numbers are
3981 resv_clusters
= (ext4_blocks_count(sbi
->s_es
) >>
3982 sbi
->s_cluster_bits
);
3984 do_div(resv_clusters
, 50);
3985 resv_clusters
= min_t(ext4_fsblk_t
, resv_clusters
, 4096);
3987 atomic64_set(&sbi
->s_resv_clusters
, resv_clusters
);
3990 static const char *ext4_quota_mode(struct super_block
*sb
)
3993 if (!ext4_quota_capable(sb
))
3996 if (EXT4_SB(sb
)->s_journal
&& ext4_is_quota_journalled(sb
))
3997 return "journalled";
4005 static int ext4_fill_super(struct super_block
*sb
, void *data
, int silent
)
4007 struct dax_device
*dax_dev
= fs_dax_get_by_bdev(sb
->s_bdev
);
4008 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
4009 struct buffer_head
*bh
, **group_desc
;
4010 struct ext4_super_block
*es
= NULL
;
4011 struct ext4_sb_info
*sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
4012 struct flex_groups
**flex_groups
;
4014 ext4_fsblk_t sb_block
= get_sb_block(&data
);
4015 ext4_fsblk_t logical_sb_block
;
4016 unsigned long offset
= 0;
4017 unsigned long journal_devnum
= 0;
4018 unsigned long def_mount_opts
;
4022 int blocksize
, clustersize
;
4023 unsigned int db_count
;
4025 int needs_recovery
, has_huge_files
;
4028 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
4029 ext4_group_t first_not_zeroed
;
4031 if ((data
&& !orig_data
) || !sbi
)
4034 sbi
->s_daxdev
= dax_dev
;
4035 sbi
->s_blockgroup_lock
=
4036 kzalloc(sizeof(struct blockgroup_lock
), GFP_KERNEL
);
4037 if (!sbi
->s_blockgroup_lock
)
4040 sb
->s_fs_info
= sbi
;
4042 sbi
->s_inode_readahead_blks
= EXT4_DEF_INODE_READAHEAD_BLKS
;
4043 sbi
->s_sb_block
= sb_block
;
4044 sbi
->s_sectors_written_start
=
4045 part_stat_read(sb
->s_bdev
, sectors
[STAT_WRITE
]);
4047 /* Cleanup superblock name */
4048 strreplace(sb
->s_id
, '/', '!');
4050 /* -EINVAL is default */
4052 blocksize
= sb_min_blocksize(sb
, EXT4_MIN_BLOCK_SIZE
);
4054 ext4_msg(sb
, KERN_ERR
, "unable to set blocksize");
4059 * The ext4 superblock will not be buffer aligned for other than 1kB
4060 * block sizes. We need to calculate the offset from buffer start.
4062 if (blocksize
!= EXT4_MIN_BLOCK_SIZE
) {
4063 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
4064 offset
= do_div(logical_sb_block
, blocksize
);
4066 logical_sb_block
= sb_block
;
4069 bh
= ext4_sb_bread_unmovable(sb
, logical_sb_block
);
4071 ext4_msg(sb
, KERN_ERR
, "unable to read superblock");
4076 * Note: s_es must be initialized as soon as possible because
4077 * some ext4 macro-instructions depend on its value
4079 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
4081 sb
->s_magic
= le16_to_cpu(es
->s_magic
);
4082 if (sb
->s_magic
!= EXT4_SUPER_MAGIC
)
4084 sbi
->s_kbytes_written
= le64_to_cpu(es
->s_kbytes_written
);
4086 /* Warn if metadata_csum and gdt_csum are both set. */
4087 if (ext4_has_feature_metadata_csum(sb
) &&
4088 ext4_has_feature_gdt_csum(sb
))
4089 ext4_warning(sb
, "metadata_csum and uninit_bg are "
4090 "redundant flags; please run fsck.");
4092 /* Check for a known checksum algorithm */
4093 if (!ext4_verify_csum_type(sb
, es
)) {
4094 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
4095 "unknown checksum algorithm.");
4100 /* Load the checksum driver */
4101 sbi
->s_chksum_driver
= crypto_alloc_shash("crc32c", 0, 0);
4102 if (IS_ERR(sbi
->s_chksum_driver
)) {
4103 ext4_msg(sb
, KERN_ERR
, "Cannot load crc32c driver.");
4104 ret
= PTR_ERR(sbi
->s_chksum_driver
);
4105 sbi
->s_chksum_driver
= NULL
;
4109 /* Check superblock checksum */
4110 if (!ext4_superblock_csum_verify(sb
, es
)) {
4111 ext4_msg(sb
, KERN_ERR
, "VFS: Found ext4 filesystem with "
4112 "invalid superblock checksum. Run e2fsck?");
4118 /* Precompute checksum seed for all metadata */
4119 if (ext4_has_feature_csum_seed(sb
))
4120 sbi
->s_csum_seed
= le32_to_cpu(es
->s_checksum_seed
);
4121 else if (ext4_has_metadata_csum(sb
) || ext4_has_feature_ea_inode(sb
))
4122 sbi
->s_csum_seed
= ext4_chksum(sbi
, ~0, es
->s_uuid
,
4123 sizeof(es
->s_uuid
));
4125 /* Set defaults before we parse the mount options */
4126 def_mount_opts
= le32_to_cpu(es
->s_default_mount_opts
);
4127 set_opt(sb
, INIT_INODE_TABLE
);
4128 if (def_mount_opts
& EXT4_DEFM_DEBUG
)
4130 if (def_mount_opts
& EXT4_DEFM_BSDGROUPS
)
4132 if (def_mount_opts
& EXT4_DEFM_UID16
)
4133 set_opt(sb
, NO_UID32
);
4134 /* xattr user namespace & acls are now defaulted on */
4135 set_opt(sb
, XATTR_USER
);
4136 #ifdef CONFIG_EXT4_FS_POSIX_ACL
4137 set_opt(sb
, POSIX_ACL
);
4139 if (ext4_has_feature_fast_commit(sb
))
4140 set_opt2(sb
, JOURNAL_FAST_COMMIT
);
4141 /* don't forget to enable journal_csum when metadata_csum is enabled. */
4142 if (ext4_has_metadata_csum(sb
))
4143 set_opt(sb
, JOURNAL_CHECKSUM
);
4145 if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_DATA
)
4146 set_opt(sb
, JOURNAL_DATA
);
4147 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_ORDERED
)
4148 set_opt(sb
, ORDERED_DATA
);
4149 else if ((def_mount_opts
& EXT4_DEFM_JMODE
) == EXT4_DEFM_JMODE_WBACK
)
4150 set_opt(sb
, WRITEBACK_DATA
);
4152 if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_PANIC
)
4153 set_opt(sb
, ERRORS_PANIC
);
4154 else if (le16_to_cpu(sbi
->s_es
->s_errors
) == EXT4_ERRORS_CONTINUE
)
4155 set_opt(sb
, ERRORS_CONT
);
4157 set_opt(sb
, ERRORS_RO
);
4158 /* block_validity enabled by default; disable with noblock_validity */
4159 set_opt(sb
, BLOCK_VALIDITY
);
4160 if (def_mount_opts
& EXT4_DEFM_DISCARD
)
4161 set_opt(sb
, DISCARD
);
4163 sbi
->s_resuid
= make_kuid(&init_user_ns
, le16_to_cpu(es
->s_def_resuid
));
4164 sbi
->s_resgid
= make_kgid(&init_user_ns
, le16_to_cpu(es
->s_def_resgid
));
4165 sbi
->s_commit_interval
= JBD2_DEFAULT_MAX_COMMIT_AGE
* HZ
;
4166 sbi
->s_min_batch_time
= EXT4_DEF_MIN_BATCH_TIME
;
4167 sbi
->s_max_batch_time
= EXT4_DEF_MAX_BATCH_TIME
;
4169 if ((def_mount_opts
& EXT4_DEFM_NOBARRIER
) == 0)
4170 set_opt(sb
, BARRIER
);
4173 * enable delayed allocation by default
4174 * Use -o nodelalloc to turn it off
4176 if (!IS_EXT3_SB(sb
) && !IS_EXT2_SB(sb
) &&
4177 ((def_mount_opts
& EXT4_DEFM_NODELALLOC
) == 0))
4178 set_opt(sb
, DELALLOC
);
4181 * set default s_li_wait_mult for lazyinit, for the case there is
4182 * no mount option specified.
4184 sbi
->s_li_wait_mult
= EXT4_DEF_LI_WAIT_MULT
;
4186 if (le32_to_cpu(es
->s_log_block_size
) >
4187 (EXT4_MAX_BLOCK_LOG_SIZE
- EXT4_MIN_BLOCK_LOG_SIZE
)) {
4188 ext4_msg(sb
, KERN_ERR
,
4189 "Invalid log block size: %u",
4190 le32_to_cpu(es
->s_log_block_size
));
4193 if (le32_to_cpu(es
->s_log_cluster_size
) >
4194 (EXT4_MAX_CLUSTER_LOG_SIZE
- EXT4_MIN_BLOCK_LOG_SIZE
)) {
4195 ext4_msg(sb
, KERN_ERR
,
4196 "Invalid log cluster size: %u",
4197 le32_to_cpu(es
->s_log_cluster_size
));
4201 blocksize
= EXT4_MIN_BLOCK_SIZE
<< le32_to_cpu(es
->s_log_block_size
);
4203 if (blocksize
== PAGE_SIZE
)
4204 set_opt(sb
, DIOREAD_NOLOCK
);
4206 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
) {
4207 sbi
->s_inode_size
= EXT4_GOOD_OLD_INODE_SIZE
;
4208 sbi
->s_first_ino
= EXT4_GOOD_OLD_FIRST_INO
;
4210 sbi
->s_inode_size
= le16_to_cpu(es
->s_inode_size
);
4211 sbi
->s_first_ino
= le32_to_cpu(es
->s_first_ino
);
4212 if (sbi
->s_first_ino
< EXT4_GOOD_OLD_FIRST_INO
) {
4213 ext4_msg(sb
, KERN_ERR
, "invalid first ino: %u",
4217 if ((sbi
->s_inode_size
< EXT4_GOOD_OLD_INODE_SIZE
) ||
4218 (!is_power_of_2(sbi
->s_inode_size
)) ||
4219 (sbi
->s_inode_size
> blocksize
)) {
4220 ext4_msg(sb
, KERN_ERR
,
4221 "unsupported inode size: %d",
4223 ext4_msg(sb
, KERN_ERR
, "blocksize: %d", blocksize
);
4227 * i_atime_extra is the last extra field available for
4228 * [acm]times in struct ext4_inode. Checking for that
4229 * field should suffice to ensure we have extra space
4232 if (sbi
->s_inode_size
>= offsetof(struct ext4_inode
, i_atime_extra
) +
4233 sizeof(((struct ext4_inode
*)0)->i_atime_extra
)) {
4234 sb
->s_time_gran
= 1;
4235 sb
->s_time_max
= EXT4_EXTRA_TIMESTAMP_MAX
;
4237 sb
->s_time_gran
= NSEC_PER_SEC
;
4238 sb
->s_time_max
= EXT4_NON_EXTRA_TIMESTAMP_MAX
;
4240 sb
->s_time_min
= EXT4_TIMESTAMP_MIN
;
4242 if (sbi
->s_inode_size
> EXT4_GOOD_OLD_INODE_SIZE
) {
4243 sbi
->s_want_extra_isize
= sizeof(struct ext4_inode
) -
4244 EXT4_GOOD_OLD_INODE_SIZE
;
4245 if (ext4_has_feature_extra_isize(sb
)) {
4246 unsigned v
, max
= (sbi
->s_inode_size
-
4247 EXT4_GOOD_OLD_INODE_SIZE
);
4249 v
= le16_to_cpu(es
->s_want_extra_isize
);
4251 ext4_msg(sb
, KERN_ERR
,
4252 "bad s_want_extra_isize: %d", v
);
4255 if (sbi
->s_want_extra_isize
< v
)
4256 sbi
->s_want_extra_isize
= v
;
4258 v
= le16_to_cpu(es
->s_min_extra_isize
);
4260 ext4_msg(sb
, KERN_ERR
,
4261 "bad s_min_extra_isize: %d", v
);
4264 if (sbi
->s_want_extra_isize
< v
)
4265 sbi
->s_want_extra_isize
= v
;
4269 if (sbi
->s_es
->s_mount_opts
[0]) {
4270 char *s_mount_opts
= kstrndup(sbi
->s_es
->s_mount_opts
,
4271 sizeof(sbi
->s_es
->s_mount_opts
),
4275 if (!parse_options(s_mount_opts
, sb
, &journal_devnum
,
4276 &journal_ioprio
, 0)) {
4277 ext4_msg(sb
, KERN_WARNING
,
4278 "failed to parse options in superblock: %s",
4281 kfree(s_mount_opts
);
4283 sbi
->s_def_mount_opt
= sbi
->s_mount_opt
;
4284 if (!parse_options((char *) data
, sb
, &journal_devnum
,
4285 &journal_ioprio
, 0))
4288 #ifdef CONFIG_UNICODE
4289 if (ext4_has_feature_casefold(sb
) && !sb
->s_encoding
) {
4290 const struct ext4_sb_encodings
*encoding_info
;
4291 struct unicode_map
*encoding
;
4292 __u16 encoding_flags
;
4294 if (ext4_has_feature_encrypt(sb
)) {
4295 ext4_msg(sb
, KERN_ERR
,
4296 "Can't mount with encoding and encryption");
4300 if (ext4_sb_read_encoding(es
, &encoding_info
,
4302 ext4_msg(sb
, KERN_ERR
,
4303 "Encoding requested by superblock is unknown");
4307 encoding
= utf8_load(encoding_info
->version
);
4308 if (IS_ERR(encoding
)) {
4309 ext4_msg(sb
, KERN_ERR
,
4310 "can't mount with superblock charset: %s-%s "
4311 "not supported by the kernel. flags: 0x%x.",
4312 encoding_info
->name
, encoding_info
->version
,
4316 ext4_msg(sb
, KERN_INFO
,"Using encoding defined by superblock: "
4317 "%s-%s with flags 0x%hx", encoding_info
->name
,
4318 encoding_info
->version
?:"\b", encoding_flags
);
4320 sb
->s_encoding
= encoding
;
4321 sb
->s_encoding_flags
= encoding_flags
;
4325 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
4326 printk_once(KERN_WARNING
"EXT4-fs: Warning: mounting with data=journal disables delayed allocation, dioread_nolock, O_DIRECT and fast_commit support!\n");
4327 /* can't mount with both data=journal and dioread_nolock. */
4328 clear_opt(sb
, DIOREAD_NOLOCK
);
4329 clear_opt2(sb
, JOURNAL_FAST_COMMIT
);
4330 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
4331 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4332 "both data=journal and delalloc");
4335 if (test_opt(sb
, DAX_ALWAYS
)) {
4336 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4337 "both data=journal and dax");
4340 if (ext4_has_feature_encrypt(sb
)) {
4341 ext4_msg(sb
, KERN_WARNING
,
4342 "encrypted files will use data=ordered "
4343 "instead of data journaling mode");
4345 if (test_opt(sb
, DELALLOC
))
4346 clear_opt(sb
, DELALLOC
);
4348 sb
->s_iflags
|= SB_I_CGROUPWB
;
4351 sb
->s_flags
= (sb
->s_flags
& ~SB_POSIXACL
) |
4352 (test_opt(sb
, POSIX_ACL
) ? SB_POSIXACL
: 0);
4354 if (le32_to_cpu(es
->s_rev_level
) == EXT4_GOOD_OLD_REV
&&
4355 (ext4_has_compat_features(sb
) ||
4356 ext4_has_ro_compat_features(sb
) ||
4357 ext4_has_incompat_features(sb
)))
4358 ext4_msg(sb
, KERN_WARNING
,
4359 "feature flags set on rev 0 fs, "
4360 "running e2fsck is recommended");
4362 if (es
->s_creator_os
== cpu_to_le32(EXT4_OS_HURD
)) {
4363 set_opt2(sb
, HURD_COMPAT
);
4364 if (ext4_has_feature_64bit(sb
)) {
4365 ext4_msg(sb
, KERN_ERR
,
4366 "The Hurd can't support 64-bit file systems");
4371 * ea_inode feature uses l_i_version field which is not
4372 * available in HURD_COMPAT mode.
4374 if (ext4_has_feature_ea_inode(sb
)) {
4375 ext4_msg(sb
, KERN_ERR
,
4376 "ea_inode feature is not supported for Hurd");
4381 if (IS_EXT2_SB(sb
)) {
4382 if (ext2_feature_set_ok(sb
))
4383 ext4_msg(sb
, KERN_INFO
, "mounting ext2 file system "
4384 "using the ext4 subsystem");
4387 * If we're probing be silent, if this looks like
4388 * it's actually an ext[34] filesystem.
4390 if (silent
&& ext4_feature_set_ok(sb
, sb_rdonly(sb
)))
4392 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext2 due "
4393 "to feature incompatibilities");
4398 if (IS_EXT3_SB(sb
)) {
4399 if (ext3_feature_set_ok(sb
))
4400 ext4_msg(sb
, KERN_INFO
, "mounting ext3 file system "
4401 "using the ext4 subsystem");
4404 * If we're probing be silent, if this looks like
4405 * it's actually an ext4 filesystem.
4407 if (silent
&& ext4_feature_set_ok(sb
, sb_rdonly(sb
)))
4409 ext4_msg(sb
, KERN_ERR
, "couldn't mount as ext3 due "
4410 "to feature incompatibilities");
4416 * Check feature flags regardless of the revision level, since we
4417 * previously didn't change the revision level when setting the flags,
4418 * so there is a chance incompat flags are set on a rev 0 filesystem.
4420 if (!ext4_feature_set_ok(sb
, (sb_rdonly(sb
))))
4423 if (le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
) > (blocksize
/ 4)) {
4424 ext4_msg(sb
, KERN_ERR
,
4425 "Number of reserved GDT blocks insanely large: %d",
4426 le16_to_cpu(sbi
->s_es
->s_reserved_gdt_blocks
));
4430 if (bdev_dax_supported(sb
->s_bdev
, blocksize
))
4431 set_bit(EXT4_FLAGS_BDEV_IS_DAX
, &sbi
->s_ext4_flags
);
4433 if (sbi
->s_mount_opt
& EXT4_MOUNT_DAX_ALWAYS
) {
4434 if (ext4_has_feature_inline_data(sb
)) {
4435 ext4_msg(sb
, KERN_ERR
, "Cannot use DAX on a filesystem"
4436 " that may contain inline data");
4439 if (!test_bit(EXT4_FLAGS_BDEV_IS_DAX
, &sbi
->s_ext4_flags
)) {
4440 ext4_msg(sb
, KERN_ERR
,
4441 "DAX unsupported by block device.");
4446 if (ext4_has_feature_encrypt(sb
) && es
->s_encryption_level
) {
4447 ext4_msg(sb
, KERN_ERR
, "Unsupported encryption level %d",
4448 es
->s_encryption_level
);
4452 if (sb
->s_blocksize
!= blocksize
) {
4453 /* Validate the filesystem blocksize */
4454 if (!sb_set_blocksize(sb
, blocksize
)) {
4455 ext4_msg(sb
, KERN_ERR
, "bad block size %d",
4461 logical_sb_block
= sb_block
* EXT4_MIN_BLOCK_SIZE
;
4462 offset
= do_div(logical_sb_block
, blocksize
);
4463 bh
= ext4_sb_bread_unmovable(sb
, logical_sb_block
);
4465 ext4_msg(sb
, KERN_ERR
,
4466 "Can't read superblock on 2nd try");
4471 es
= (struct ext4_super_block
*)(bh
->b_data
+ offset
);
4473 if (es
->s_magic
!= cpu_to_le16(EXT4_SUPER_MAGIC
)) {
4474 ext4_msg(sb
, KERN_ERR
,
4475 "Magic mismatch, very weird!");
4480 has_huge_files
= ext4_has_feature_huge_file(sb
);
4481 sbi
->s_bitmap_maxbytes
= ext4_max_bitmap_size(sb
->s_blocksize_bits
,
4483 sb
->s_maxbytes
= ext4_max_size(sb
->s_blocksize_bits
, has_huge_files
);
4485 sbi
->s_desc_size
= le16_to_cpu(es
->s_desc_size
);
4486 if (ext4_has_feature_64bit(sb
)) {
4487 if (sbi
->s_desc_size
< EXT4_MIN_DESC_SIZE_64BIT
||
4488 sbi
->s_desc_size
> EXT4_MAX_DESC_SIZE
||
4489 !is_power_of_2(sbi
->s_desc_size
)) {
4490 ext4_msg(sb
, KERN_ERR
,
4491 "unsupported descriptor size %lu",
4496 sbi
->s_desc_size
= EXT4_MIN_DESC_SIZE
;
4498 sbi
->s_blocks_per_group
= le32_to_cpu(es
->s_blocks_per_group
);
4499 sbi
->s_inodes_per_group
= le32_to_cpu(es
->s_inodes_per_group
);
4501 sbi
->s_inodes_per_block
= blocksize
/ EXT4_INODE_SIZE(sb
);
4502 if (sbi
->s_inodes_per_block
== 0)
4504 if (sbi
->s_inodes_per_group
< sbi
->s_inodes_per_block
||
4505 sbi
->s_inodes_per_group
> blocksize
* 8) {
4506 ext4_msg(sb
, KERN_ERR
, "invalid inodes per group: %lu\n",
4507 sbi
->s_inodes_per_group
);
4510 sbi
->s_itb_per_group
= sbi
->s_inodes_per_group
/
4511 sbi
->s_inodes_per_block
;
4512 sbi
->s_desc_per_block
= blocksize
/ EXT4_DESC_SIZE(sb
);
4514 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
4515 sbi
->s_addr_per_block_bits
= ilog2(EXT4_ADDR_PER_BLOCK(sb
));
4516 sbi
->s_desc_per_block_bits
= ilog2(EXT4_DESC_PER_BLOCK(sb
));
4518 for (i
= 0; i
< 4; i
++)
4519 sbi
->s_hash_seed
[i
] = le32_to_cpu(es
->s_hash_seed
[i
]);
4520 sbi
->s_def_hash_version
= es
->s_def_hash_version
;
4521 if (ext4_has_feature_dir_index(sb
)) {
4522 i
= le32_to_cpu(es
->s_flags
);
4523 if (i
& EXT2_FLAGS_UNSIGNED_HASH
)
4524 sbi
->s_hash_unsigned
= 3;
4525 else if ((i
& EXT2_FLAGS_SIGNED_HASH
) == 0) {
4526 #ifdef __CHAR_UNSIGNED__
4529 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH
);
4530 sbi
->s_hash_unsigned
= 3;
4534 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH
);
4539 /* Handle clustersize */
4540 clustersize
= BLOCK_SIZE
<< le32_to_cpu(es
->s_log_cluster_size
);
4541 if (ext4_has_feature_bigalloc(sb
)) {
4542 if (clustersize
< blocksize
) {
4543 ext4_msg(sb
, KERN_ERR
,
4544 "cluster size (%d) smaller than "
4545 "block size (%d)", clustersize
, blocksize
);
4548 sbi
->s_cluster_bits
= le32_to_cpu(es
->s_log_cluster_size
) -
4549 le32_to_cpu(es
->s_log_block_size
);
4550 sbi
->s_clusters_per_group
=
4551 le32_to_cpu(es
->s_clusters_per_group
);
4552 if (sbi
->s_clusters_per_group
> blocksize
* 8) {
4553 ext4_msg(sb
, KERN_ERR
,
4554 "#clusters per group too big: %lu",
4555 sbi
->s_clusters_per_group
);
4558 if (sbi
->s_blocks_per_group
!=
4559 (sbi
->s_clusters_per_group
* (clustersize
/ blocksize
))) {
4560 ext4_msg(sb
, KERN_ERR
, "blocks per group (%lu) and "
4561 "clusters per group (%lu) inconsistent",
4562 sbi
->s_blocks_per_group
,
4563 sbi
->s_clusters_per_group
);
4567 if (clustersize
!= blocksize
) {
4568 ext4_msg(sb
, KERN_ERR
,
4569 "fragment/cluster size (%d) != "
4570 "block size (%d)", clustersize
, blocksize
);
4573 if (sbi
->s_blocks_per_group
> blocksize
* 8) {
4574 ext4_msg(sb
, KERN_ERR
,
4575 "#blocks per group too big: %lu",
4576 sbi
->s_blocks_per_group
);
4579 sbi
->s_clusters_per_group
= sbi
->s_blocks_per_group
;
4580 sbi
->s_cluster_bits
= 0;
4582 sbi
->s_cluster_ratio
= clustersize
/ blocksize
;
4584 /* Do we have standard group size of clustersize * 8 blocks ? */
4585 if (sbi
->s_blocks_per_group
== clustersize
<< 3)
4586 set_opt2(sb
, STD_GROUP_SIZE
);
4589 * Test whether we have more sectors than will fit in sector_t,
4590 * and whether the max offset is addressable by the page cache.
4592 err
= generic_check_addressable(sb
->s_blocksize_bits
,
4593 ext4_blocks_count(es
));
4595 ext4_msg(sb
, KERN_ERR
, "filesystem"
4596 " too large to mount safely on this system");
4600 if (EXT4_BLOCKS_PER_GROUP(sb
) == 0)
4603 /* check blocks count against device size */
4604 blocks_count
= sb
->s_bdev
->bd_inode
->i_size
>> sb
->s_blocksize_bits
;
4605 if (blocks_count
&& ext4_blocks_count(es
) > blocks_count
) {
4606 ext4_msg(sb
, KERN_WARNING
, "bad geometry: block count %llu "
4607 "exceeds size of device (%llu blocks)",
4608 ext4_blocks_count(es
), blocks_count
);
4613 * It makes no sense for the first data block to be beyond the end
4614 * of the filesystem.
4616 if (le32_to_cpu(es
->s_first_data_block
) >= ext4_blocks_count(es
)) {
4617 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data "
4618 "block %u is beyond end of filesystem (%llu)",
4619 le32_to_cpu(es
->s_first_data_block
),
4620 ext4_blocks_count(es
));
4623 if ((es
->s_first_data_block
== 0) && (es
->s_log_block_size
== 0) &&
4624 (sbi
->s_cluster_ratio
== 1)) {
4625 ext4_msg(sb
, KERN_WARNING
, "bad geometry: first data "
4626 "block is 0 with a 1k block and cluster size");
4630 blocks_count
= (ext4_blocks_count(es
) -
4631 le32_to_cpu(es
->s_first_data_block
) +
4632 EXT4_BLOCKS_PER_GROUP(sb
) - 1);
4633 do_div(blocks_count
, EXT4_BLOCKS_PER_GROUP(sb
));
4634 if (blocks_count
> ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb
)) {
4635 ext4_msg(sb
, KERN_WARNING
, "groups count too large: %llu "
4636 "(block count %llu, first data block %u, "
4637 "blocks per group %lu)", blocks_count
,
4638 ext4_blocks_count(es
),
4639 le32_to_cpu(es
->s_first_data_block
),
4640 EXT4_BLOCKS_PER_GROUP(sb
));
4643 sbi
->s_groups_count
= blocks_count
;
4644 sbi
->s_blockfile_groups
= min_t(ext4_group_t
, sbi
->s_groups_count
,
4645 (EXT4_MAX_BLOCK_FILE_PHYS
/ EXT4_BLOCKS_PER_GROUP(sb
)));
4646 if (((u64
)sbi
->s_groups_count
* sbi
->s_inodes_per_group
) !=
4647 le32_to_cpu(es
->s_inodes_count
)) {
4648 ext4_msg(sb
, KERN_ERR
, "inodes count not valid: %u vs %llu",
4649 le32_to_cpu(es
->s_inodes_count
),
4650 ((u64
)sbi
->s_groups_count
* sbi
->s_inodes_per_group
));
4654 db_count
= (sbi
->s_groups_count
+ EXT4_DESC_PER_BLOCK(sb
) - 1) /
4655 EXT4_DESC_PER_BLOCK(sb
);
4656 if (ext4_has_feature_meta_bg(sb
)) {
4657 if (le32_to_cpu(es
->s_first_meta_bg
) > db_count
) {
4658 ext4_msg(sb
, KERN_WARNING
,
4659 "first meta block group too large: %u "
4660 "(group descriptor block count %u)",
4661 le32_to_cpu(es
->s_first_meta_bg
), db_count
);
4665 rcu_assign_pointer(sbi
->s_group_desc
,
4666 kvmalloc_array(db_count
,
4667 sizeof(struct buffer_head
*),
4669 if (sbi
->s_group_desc
== NULL
) {
4670 ext4_msg(sb
, KERN_ERR
, "not enough memory");
4675 bgl_lock_init(sbi
->s_blockgroup_lock
);
4677 /* Pre-read the descriptors into the buffer cache */
4678 for (i
= 0; i
< db_count
; i
++) {
4679 block
= descriptor_loc(sb
, logical_sb_block
, i
);
4680 ext4_sb_breadahead_unmovable(sb
, block
);
4683 for (i
= 0; i
< db_count
; i
++) {
4684 struct buffer_head
*bh
;
4686 block
= descriptor_loc(sb
, logical_sb_block
, i
);
4687 bh
= ext4_sb_bread_unmovable(sb
, block
);
4689 ext4_msg(sb
, KERN_ERR
,
4690 "can't read group descriptor %d", i
);
4696 rcu_dereference(sbi
->s_group_desc
)[i
] = bh
;
4699 sbi
->s_gdb_count
= db_count
;
4700 if (!ext4_check_descriptors(sb
, logical_sb_block
, &first_not_zeroed
)) {
4701 ext4_msg(sb
, KERN_ERR
, "group descriptors corrupted!");
4702 ret
= -EFSCORRUPTED
;
4706 timer_setup(&sbi
->s_err_report
, print_daily_error_info
, 0);
4707 spin_lock_init(&sbi
->s_error_lock
);
4708 INIT_WORK(&sbi
->s_error_work
, flush_stashed_error_work
);
4710 /* Register extent status tree shrinker */
4711 if (ext4_es_register_shrinker(sbi
))
4714 sbi
->s_stripe
= ext4_get_stripe_size(sbi
);
4715 sbi
->s_extent_max_zeroout_kb
= 32;
4718 * set up enough so that it can read an inode
4720 sb
->s_op
= &ext4_sops
;
4721 sb
->s_export_op
= &ext4_export_ops
;
4722 sb
->s_xattr
= ext4_xattr_handlers
;
4723 #ifdef CONFIG_FS_ENCRYPTION
4724 sb
->s_cop
= &ext4_cryptops
;
4726 #ifdef CONFIG_FS_VERITY
4727 sb
->s_vop
= &ext4_verityops
;
4730 sb
->dq_op
= &ext4_quota_operations
;
4731 if (ext4_has_feature_quota(sb
))
4732 sb
->s_qcop
= &dquot_quotactl_sysfile_ops
;
4734 sb
->s_qcop
= &ext4_qctl_operations
;
4735 sb
->s_quota_types
= QTYPE_MASK_USR
| QTYPE_MASK_GRP
| QTYPE_MASK_PRJ
;
4737 memcpy(&sb
->s_uuid
, es
->s_uuid
, sizeof(es
->s_uuid
));
4739 INIT_LIST_HEAD(&sbi
->s_orphan
); /* unlinked but open files */
4740 mutex_init(&sbi
->s_orphan_lock
);
4742 /* Initialize fast commit stuff */
4743 atomic_set(&sbi
->s_fc_subtid
, 0);
4744 atomic_set(&sbi
->s_fc_ineligible_updates
, 0);
4745 INIT_LIST_HEAD(&sbi
->s_fc_q
[FC_Q_MAIN
]);
4746 INIT_LIST_HEAD(&sbi
->s_fc_q
[FC_Q_STAGING
]);
4747 INIT_LIST_HEAD(&sbi
->s_fc_dentry_q
[FC_Q_MAIN
]);
4748 INIT_LIST_HEAD(&sbi
->s_fc_dentry_q
[FC_Q_STAGING
]);
4749 sbi
->s_fc_bytes
= 0;
4750 ext4_clear_mount_flag(sb
, EXT4_MF_FC_INELIGIBLE
);
4751 ext4_clear_mount_flag(sb
, EXT4_MF_FC_COMMITTING
);
4752 spin_lock_init(&sbi
->s_fc_lock
);
4753 memset(&sbi
->s_fc_stats
, 0, sizeof(sbi
->s_fc_stats
));
4754 sbi
->s_fc_replay_state
.fc_regions
= NULL
;
4755 sbi
->s_fc_replay_state
.fc_regions_size
= 0;
4756 sbi
->s_fc_replay_state
.fc_regions_used
= 0;
4757 sbi
->s_fc_replay_state
.fc_regions_valid
= 0;
4758 sbi
->s_fc_replay_state
.fc_modified_inodes
= NULL
;
4759 sbi
->s_fc_replay_state
.fc_modified_inodes_size
= 0;
4760 sbi
->s_fc_replay_state
.fc_modified_inodes_used
= 0;
4764 needs_recovery
= (es
->s_last_orphan
!= 0 ||
4765 ext4_has_feature_journal_needs_recovery(sb
));
4767 if (ext4_has_feature_mmp(sb
) && !sb_rdonly(sb
))
4768 if (ext4_multi_mount_protect(sb
, le64_to_cpu(es
->s_mmp_block
)))
4769 goto failed_mount3a
;
4772 * The first inode we look at is the journal inode. Don't try
4773 * root first: it may be modified in the journal!
4775 if (!test_opt(sb
, NOLOAD
) && ext4_has_feature_journal(sb
)) {
4776 err
= ext4_load_journal(sb
, es
, journal_devnum
);
4778 goto failed_mount3a
;
4779 } else if (test_opt(sb
, NOLOAD
) && !sb_rdonly(sb
) &&
4780 ext4_has_feature_journal_needs_recovery(sb
)) {
4781 ext4_msg(sb
, KERN_ERR
, "required journal recovery "
4782 "suppressed and not mounted read-only");
4783 goto failed_mount_wq
;
4785 /* Nojournal mode, all journal mount options are illegal */
4786 if (test_opt2(sb
, EXPLICIT_JOURNAL_CHECKSUM
)) {
4787 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4788 "journal_checksum, fs mounted w/o journal");
4789 goto failed_mount_wq
;
4791 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
4792 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4793 "journal_async_commit, fs mounted w/o journal");
4794 goto failed_mount_wq
;
4796 if (sbi
->s_commit_interval
!= JBD2_DEFAULT_MAX_COMMIT_AGE
*HZ
) {
4797 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4798 "commit=%lu, fs mounted w/o journal",
4799 sbi
->s_commit_interval
/ HZ
);
4800 goto failed_mount_wq
;
4802 if (EXT4_MOUNT_DATA_FLAGS
&
4803 (sbi
->s_mount_opt
^ sbi
->s_def_mount_opt
)) {
4804 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4805 "data=, fs mounted w/o journal");
4806 goto failed_mount_wq
;
4808 sbi
->s_def_mount_opt
&= ~EXT4_MOUNT_JOURNAL_CHECKSUM
;
4809 clear_opt(sb
, JOURNAL_CHECKSUM
);
4810 clear_opt(sb
, DATA_FLAGS
);
4811 clear_opt2(sb
, JOURNAL_FAST_COMMIT
);
4812 sbi
->s_journal
= NULL
;
4817 if (ext4_has_feature_64bit(sb
) &&
4818 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
4819 JBD2_FEATURE_INCOMPAT_64BIT
)) {
4820 ext4_msg(sb
, KERN_ERR
, "Failed to set 64-bit journal feature");
4821 goto failed_mount_wq
;
4824 if (!set_journal_csum_feature_set(sb
)) {
4825 ext4_msg(sb
, KERN_ERR
, "Failed to set journal checksum "
4827 goto failed_mount_wq
;
4830 if (test_opt2(sb
, JOURNAL_FAST_COMMIT
) &&
4831 !jbd2_journal_set_features(EXT4_SB(sb
)->s_journal
, 0, 0,
4832 JBD2_FEATURE_INCOMPAT_FAST_COMMIT
)) {
4833 ext4_msg(sb
, KERN_ERR
,
4834 "Failed to set fast commit journal feature");
4835 goto failed_mount_wq
;
4838 /* We have now updated the journal if required, so we can
4839 * validate the data journaling mode. */
4840 switch (test_opt(sb
, DATA_FLAGS
)) {
4842 /* No mode set, assume a default based on the journal
4843 * capabilities: ORDERED_DATA if the journal can
4844 * cope, else JOURNAL_DATA
4846 if (jbd2_journal_check_available_features
4847 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
4848 set_opt(sb
, ORDERED_DATA
);
4849 sbi
->s_def_mount_opt
|= EXT4_MOUNT_ORDERED_DATA
;
4851 set_opt(sb
, JOURNAL_DATA
);
4852 sbi
->s_def_mount_opt
|= EXT4_MOUNT_JOURNAL_DATA
;
4856 case EXT4_MOUNT_ORDERED_DATA
:
4857 case EXT4_MOUNT_WRITEBACK_DATA
:
4858 if (!jbd2_journal_check_available_features
4859 (sbi
->s_journal
, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE
)) {
4860 ext4_msg(sb
, KERN_ERR
, "Journal does not support "
4861 "requested data journaling mode");
4862 goto failed_mount_wq
;
4869 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
&&
4870 test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
4871 ext4_msg(sb
, KERN_ERR
, "can't mount with "
4872 "journal_async_commit in data=ordered mode");
4873 goto failed_mount_wq
;
4876 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
4878 sbi
->s_journal
->j_commit_callback
= ext4_journal_commit_callback
;
4879 sbi
->s_journal
->j_submit_inode_data_buffers
=
4880 ext4_journal_submit_inode_data_buffers
;
4881 sbi
->s_journal
->j_finish_inode_data_buffers
=
4882 ext4_journal_finish_inode_data_buffers
;
4885 if (!test_opt(sb
, NO_MBCACHE
)) {
4886 sbi
->s_ea_block_cache
= ext4_xattr_create_cache();
4887 if (!sbi
->s_ea_block_cache
) {
4888 ext4_msg(sb
, KERN_ERR
,
4889 "Failed to create ea_block_cache");
4890 goto failed_mount_wq
;
4893 if (ext4_has_feature_ea_inode(sb
)) {
4894 sbi
->s_ea_inode_cache
= ext4_xattr_create_cache();
4895 if (!sbi
->s_ea_inode_cache
) {
4896 ext4_msg(sb
, KERN_ERR
,
4897 "Failed to create ea_inode_cache");
4898 goto failed_mount_wq
;
4903 if (ext4_has_feature_verity(sb
) && blocksize
!= PAGE_SIZE
) {
4904 ext4_msg(sb
, KERN_ERR
, "Unsupported blocksize for fs-verity");
4905 goto failed_mount_wq
;
4908 if (DUMMY_ENCRYPTION_ENABLED(sbi
) && !sb_rdonly(sb
) &&
4909 !ext4_has_feature_encrypt(sb
)) {
4910 ext4_set_feature_encrypt(sb
);
4911 ext4_commit_super(sb
);
4915 * Get the # of file system overhead blocks from the
4916 * superblock if present.
4918 if (es
->s_overhead_clusters
)
4919 sbi
->s_overhead
= le32_to_cpu(es
->s_overhead_clusters
);
4921 err
= ext4_calculate_overhead(sb
);
4923 goto failed_mount_wq
;
4927 * The maximum number of concurrent works can be high and
4928 * concurrency isn't really necessary. Limit it to 1.
4930 EXT4_SB(sb
)->rsv_conversion_wq
=
4931 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM
| WQ_UNBOUND
, 1);
4932 if (!EXT4_SB(sb
)->rsv_conversion_wq
) {
4933 printk(KERN_ERR
"EXT4-fs: failed to create workqueue\n");
4939 * The jbd2_journal_load will have done any necessary log recovery,
4940 * so we can safely mount the rest of the filesystem now.
4943 root
= ext4_iget(sb
, EXT4_ROOT_INO
, EXT4_IGET_SPECIAL
);
4945 ext4_msg(sb
, KERN_ERR
, "get root inode failed");
4946 ret
= PTR_ERR(root
);
4950 if (!S_ISDIR(root
->i_mode
) || !root
->i_blocks
|| !root
->i_size
) {
4951 ext4_msg(sb
, KERN_ERR
, "corrupt root inode, run e2fsck");
4956 sb
->s_root
= d_make_root(root
);
4958 ext4_msg(sb
, KERN_ERR
, "get root dentry failed");
4963 ret
= ext4_setup_super(sb
, es
, sb_rdonly(sb
));
4964 if (ret
== -EROFS
) {
4965 sb
->s_flags
|= SB_RDONLY
;
4968 goto failed_mount4a
;
4970 ext4_set_resv_clusters(sb
);
4972 if (test_opt(sb
, BLOCK_VALIDITY
)) {
4973 err
= ext4_setup_system_zone(sb
);
4975 ext4_msg(sb
, KERN_ERR
, "failed to initialize system "
4977 goto failed_mount4a
;
4980 ext4_fc_replay_cleanup(sb
);
4983 err
= ext4_mb_init(sb
);
4985 ext4_msg(sb
, KERN_ERR
, "failed to initialize mballoc (%d)",
4990 block
= ext4_count_free_clusters(sb
);
4991 ext4_free_blocks_count_set(sbi
->s_es
,
4992 EXT4_C2B(sbi
, block
));
4993 err
= percpu_counter_init(&sbi
->s_freeclusters_counter
, block
,
4996 unsigned long freei
= ext4_count_free_inodes(sb
);
4997 sbi
->s_es
->s_free_inodes_count
= cpu_to_le32(freei
);
4998 err
= percpu_counter_init(&sbi
->s_freeinodes_counter
, freei
,
5002 err
= percpu_counter_init(&sbi
->s_dirs_counter
,
5003 ext4_count_dirs(sb
), GFP_KERNEL
);
5005 err
= percpu_counter_init(&sbi
->s_dirtyclusters_counter
, 0,
5008 err
= percpu_init_rwsem(&sbi
->s_writepages_rwsem
);
5011 ext4_msg(sb
, KERN_ERR
, "insufficient memory");
5015 if (ext4_has_feature_flex_bg(sb
))
5016 if (!ext4_fill_flex_info(sb
)) {
5017 ext4_msg(sb
, KERN_ERR
,
5018 "unable to initialize "
5019 "flex_bg meta info!");
5023 err
= ext4_register_li_request(sb
, first_not_zeroed
);
5027 err
= ext4_register_sysfs(sb
);
5032 /* Enable quota usage during mount. */
5033 if (ext4_has_feature_quota(sb
) && !sb_rdonly(sb
)) {
5034 err
= ext4_enable_quotas(sb
);
5038 #endif /* CONFIG_QUOTA */
5041 * Save the original bdev mapping's wb_err value which could be
5042 * used to detect the metadata async write error.
5044 spin_lock_init(&sbi
->s_bdev_wb_lock
);
5045 errseq_check_and_advance(&sb
->s_bdev
->bd_inode
->i_mapping
->wb_err
,
5046 &sbi
->s_bdev_wb_err
);
5047 sb
->s_bdev
->bd_super
= sb
;
5048 EXT4_SB(sb
)->s_mount_state
|= EXT4_ORPHAN_FS
;
5049 ext4_orphan_cleanup(sb
, es
);
5050 EXT4_SB(sb
)->s_mount_state
&= ~EXT4_ORPHAN_FS
;
5051 if (needs_recovery
) {
5052 ext4_msg(sb
, KERN_INFO
, "recovery complete");
5053 err
= ext4_mark_recovery_complete(sb
, es
);
5057 if (EXT4_SB(sb
)->s_journal
) {
5058 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
)
5059 descr
= " journalled data mode";
5060 else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
)
5061 descr
= " ordered data mode";
5063 descr
= " writeback data mode";
5065 descr
= "out journal";
5067 if (test_opt(sb
, DISCARD
)) {
5068 struct request_queue
*q
= bdev_get_queue(sb
->s_bdev
);
5069 if (!blk_queue_discard(q
))
5070 ext4_msg(sb
, KERN_WARNING
,
5071 "mounting with \"discard\" option, but "
5072 "the device does not support discard");
5075 if (___ratelimit(&ext4_mount_msg_ratelimit
, "EXT4-fs mount"))
5076 ext4_msg(sb
, KERN_INFO
, "mounted filesystem with%s. "
5077 "Opts: %.*s%s%s. Quota mode: %s.", descr
,
5078 (int) sizeof(sbi
->s_es
->s_mount_opts
),
5079 sbi
->s_es
->s_mount_opts
,
5080 *sbi
->s_es
->s_mount_opts
? "; " : "", orig_data
,
5081 ext4_quota_mode(sb
));
5083 if (es
->s_error_count
)
5084 mod_timer(&sbi
->s_err_report
, jiffies
+ 300*HZ
); /* 5 minutes */
5086 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
5087 ratelimit_state_init(&sbi
->s_err_ratelimit_state
, 5 * HZ
, 10);
5088 ratelimit_state_init(&sbi
->s_warning_ratelimit_state
, 5 * HZ
, 10);
5089 ratelimit_state_init(&sbi
->s_msg_ratelimit_state
, 5 * HZ
, 10);
5090 atomic_set(&sbi
->s_warning_count
, 0);
5091 atomic_set(&sbi
->s_msg_count
, 0);
5098 ext4_msg(sb
, KERN_ERR
, "VFS: Can't find ext4 filesystem");
5102 ext4_unregister_sysfs(sb
);
5103 kobject_put(&sbi
->s_kobj
);
5105 ext4_unregister_li_request(sb
);
5107 ext4_mb_release(sb
);
5109 flex_groups
= rcu_dereference(sbi
->s_flex_groups
);
5111 for (i
= 0; i
< sbi
->s_flex_groups_allocated
; i
++)
5112 kvfree(flex_groups
[i
]);
5113 kvfree(flex_groups
);
5116 percpu_counter_destroy(&sbi
->s_freeclusters_counter
);
5117 percpu_counter_destroy(&sbi
->s_freeinodes_counter
);
5118 percpu_counter_destroy(&sbi
->s_dirs_counter
);
5119 percpu_counter_destroy(&sbi
->s_dirtyclusters_counter
);
5120 percpu_free_rwsem(&sbi
->s_writepages_rwsem
);
5122 ext4_ext_release(sb
);
5123 ext4_release_system_zone(sb
);
5128 ext4_msg(sb
, KERN_ERR
, "mount failed");
5129 if (EXT4_SB(sb
)->rsv_conversion_wq
)
5130 destroy_workqueue(EXT4_SB(sb
)->rsv_conversion_wq
);
5132 ext4_xattr_destroy_cache(sbi
->s_ea_inode_cache
);
5133 sbi
->s_ea_inode_cache
= NULL
;
5135 ext4_xattr_destroy_cache(sbi
->s_ea_block_cache
);
5136 sbi
->s_ea_block_cache
= NULL
;
5138 if (sbi
->s_journal
) {
5139 jbd2_journal_destroy(sbi
->s_journal
);
5140 sbi
->s_journal
= NULL
;
5143 ext4_es_unregister_shrinker(sbi
);
5145 del_timer_sync(&sbi
->s_err_report
);
5146 flush_work(&sbi
->s_error_work
);
5148 kthread_stop(sbi
->s_mmp_tsk
);
5151 group_desc
= rcu_dereference(sbi
->s_group_desc
);
5152 for (i
= 0; i
< db_count
; i
++)
5153 brelse(group_desc
[i
]);
5157 if (sbi
->s_chksum_driver
)
5158 crypto_free_shash(sbi
->s_chksum_driver
);
5160 #ifdef CONFIG_UNICODE
5161 utf8_unload(sb
->s_encoding
);
5165 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
5166 kfree(get_qf_name(sb
, sbi
, i
));
5168 fscrypt_free_dummy_policy(&sbi
->s_dummy_enc_policy
);
5169 ext4_blkdev_remove(sbi
);
5172 sb
->s_fs_info
= NULL
;
5173 kfree(sbi
->s_blockgroup_lock
);
5177 fs_put_dax(dax_dev
);
5178 return err
? err
: ret
;
5182 * Setup any per-fs journal parameters now. We'll do this both on
5183 * initial mount, once the journal has been initialised but before we've
5184 * done any recovery; and again on any subsequent remount.
5186 static void ext4_init_journal_params(struct super_block
*sb
, journal_t
*journal
)
5188 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
5190 journal
->j_commit_interval
= sbi
->s_commit_interval
;
5191 journal
->j_min_batch_time
= sbi
->s_min_batch_time
;
5192 journal
->j_max_batch_time
= sbi
->s_max_batch_time
;
5193 ext4_fc_init(sb
, journal
);
5195 write_lock(&journal
->j_state_lock
);
5196 if (test_opt(sb
, BARRIER
))
5197 journal
->j_flags
|= JBD2_BARRIER
;
5199 journal
->j_flags
&= ~JBD2_BARRIER
;
5200 if (test_opt(sb
, DATA_ERR_ABORT
))
5201 journal
->j_flags
|= JBD2_ABORT_ON_SYNCDATA_ERR
;
5203 journal
->j_flags
&= ~JBD2_ABORT_ON_SYNCDATA_ERR
;
5204 write_unlock(&journal
->j_state_lock
);
5207 static struct inode
*ext4_get_journal_inode(struct super_block
*sb
,
5208 unsigned int journal_inum
)
5210 struct inode
*journal_inode
;
5213 * Test for the existence of a valid inode on disk. Bad things
5214 * happen if we iget() an unused inode, as the subsequent iput()
5215 * will try to delete it.
5217 journal_inode
= ext4_iget(sb
, journal_inum
, EXT4_IGET_SPECIAL
);
5218 if (IS_ERR(journal_inode
)) {
5219 ext4_msg(sb
, KERN_ERR
, "no journal found");
5222 if (!journal_inode
->i_nlink
) {
5223 make_bad_inode(journal_inode
);
5224 iput(journal_inode
);
5225 ext4_msg(sb
, KERN_ERR
, "journal inode is deleted");
5229 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
5230 journal_inode
, journal_inode
->i_size
);
5231 if (!S_ISREG(journal_inode
->i_mode
)) {
5232 ext4_msg(sb
, KERN_ERR
, "invalid journal inode");
5233 iput(journal_inode
);
5236 return journal_inode
;
5239 static journal_t
*ext4_get_journal(struct super_block
*sb
,
5240 unsigned int journal_inum
)
5242 struct inode
*journal_inode
;
5245 if (WARN_ON_ONCE(!ext4_has_feature_journal(sb
)))
5248 journal_inode
= ext4_get_journal_inode(sb
, journal_inum
);
5252 journal
= jbd2_journal_init_inode(journal_inode
);
5254 ext4_msg(sb
, KERN_ERR
, "Could not load journal inode");
5255 iput(journal_inode
);
5258 journal
->j_private
= sb
;
5259 ext4_init_journal_params(sb
, journal
);
5263 static journal_t
*ext4_get_dev_journal(struct super_block
*sb
,
5266 struct buffer_head
*bh
;
5270 int hblock
, blocksize
;
5271 ext4_fsblk_t sb_block
;
5272 unsigned long offset
;
5273 struct ext4_super_block
*es
;
5274 struct block_device
*bdev
;
5276 if (WARN_ON_ONCE(!ext4_has_feature_journal(sb
)))
5279 bdev
= ext4_blkdev_get(j_dev
, sb
);
5283 blocksize
= sb
->s_blocksize
;
5284 hblock
= bdev_logical_block_size(bdev
);
5285 if (blocksize
< hblock
) {
5286 ext4_msg(sb
, KERN_ERR
,
5287 "blocksize too small for journal device");
5291 sb_block
= EXT4_MIN_BLOCK_SIZE
/ blocksize
;
5292 offset
= EXT4_MIN_BLOCK_SIZE
% blocksize
;
5293 set_blocksize(bdev
, blocksize
);
5294 if (!(bh
= __bread(bdev
, sb_block
, blocksize
))) {
5295 ext4_msg(sb
, KERN_ERR
, "couldn't read superblock of "
5296 "external journal");
5300 es
= (struct ext4_super_block
*) (bh
->b_data
+ offset
);
5301 if ((le16_to_cpu(es
->s_magic
) != EXT4_SUPER_MAGIC
) ||
5302 !(le32_to_cpu(es
->s_feature_incompat
) &
5303 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV
)) {
5304 ext4_msg(sb
, KERN_ERR
, "external journal has "
5310 if ((le32_to_cpu(es
->s_feature_ro_compat
) &
5311 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
) &&
5312 es
->s_checksum
!= ext4_superblock_csum(sb
, es
)) {
5313 ext4_msg(sb
, KERN_ERR
, "external journal has "
5314 "corrupt superblock");
5319 if (memcmp(EXT4_SB(sb
)->s_es
->s_journal_uuid
, es
->s_uuid
, 16)) {
5320 ext4_msg(sb
, KERN_ERR
, "journal UUID does not match");
5325 len
= ext4_blocks_count(es
);
5326 start
= sb_block
+ 1;
5327 brelse(bh
); /* we're done with the superblock */
5329 journal
= jbd2_journal_init_dev(bdev
, sb
->s_bdev
,
5330 start
, len
, blocksize
);
5332 ext4_msg(sb
, KERN_ERR
, "failed to create device journal");
5335 journal
->j_private
= sb
;
5336 if (ext4_read_bh_lock(journal
->j_sb_buffer
, REQ_META
| REQ_PRIO
, true)) {
5337 ext4_msg(sb
, KERN_ERR
, "I/O error on journal device");
5340 if (be32_to_cpu(journal
->j_superblock
->s_nr_users
) != 1) {
5341 ext4_msg(sb
, KERN_ERR
, "External journal has more than one "
5342 "user (unsupported) - %d",
5343 be32_to_cpu(journal
->j_superblock
->s_nr_users
));
5346 EXT4_SB(sb
)->s_journal_bdev
= bdev
;
5347 ext4_init_journal_params(sb
, journal
);
5351 jbd2_journal_destroy(journal
);
5353 ext4_blkdev_put(bdev
);
5357 static int ext4_load_journal(struct super_block
*sb
,
5358 struct ext4_super_block
*es
,
5359 unsigned long journal_devnum
)
5362 unsigned int journal_inum
= le32_to_cpu(es
->s_journal_inum
);
5365 int really_read_only
;
5368 if (WARN_ON_ONCE(!ext4_has_feature_journal(sb
)))
5369 return -EFSCORRUPTED
;
5371 if (journal_devnum
&&
5372 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
5373 ext4_msg(sb
, KERN_INFO
, "external journal device major/minor "
5374 "numbers have changed");
5375 journal_dev
= new_decode_dev(journal_devnum
);
5377 journal_dev
= new_decode_dev(le32_to_cpu(es
->s_journal_dev
));
5379 if (journal_inum
&& journal_dev
) {
5380 ext4_msg(sb
, KERN_ERR
,
5381 "filesystem has both journal inode and journal device!");
5386 journal
= ext4_get_journal(sb
, journal_inum
);
5390 journal
= ext4_get_dev_journal(sb
, journal_dev
);
5395 journal_dev_ro
= bdev_read_only(journal
->j_dev
);
5396 really_read_only
= bdev_read_only(sb
->s_bdev
) | journal_dev_ro
;
5398 if (journal_dev_ro
&& !sb_rdonly(sb
)) {
5399 ext4_msg(sb
, KERN_ERR
,
5400 "journal device read-only, try mounting with '-o ro'");
5406 * Are we loading a blank journal or performing recovery after a
5407 * crash? For recovery, we need to check in advance whether we
5408 * can get read-write access to the device.
5410 if (ext4_has_feature_journal_needs_recovery(sb
)) {
5411 if (sb_rdonly(sb
)) {
5412 ext4_msg(sb
, KERN_INFO
, "INFO: recovery "
5413 "required on readonly filesystem");
5414 if (really_read_only
) {
5415 ext4_msg(sb
, KERN_ERR
, "write access "
5416 "unavailable, cannot proceed "
5417 "(try mounting with noload)");
5421 ext4_msg(sb
, KERN_INFO
, "write access will "
5422 "be enabled during recovery");
5426 if (!(journal
->j_flags
& JBD2_BARRIER
))
5427 ext4_msg(sb
, KERN_INFO
, "barriers disabled");
5429 if (!ext4_has_feature_journal_needs_recovery(sb
))
5430 err
= jbd2_journal_wipe(journal
, !really_read_only
);
5432 char *save
= kmalloc(EXT4_S_ERR_LEN
, GFP_KERNEL
);
5434 memcpy(save
, ((char *) es
) +
5435 EXT4_S_ERR_START
, EXT4_S_ERR_LEN
);
5436 err
= jbd2_journal_load(journal
);
5438 memcpy(((char *) es
) + EXT4_S_ERR_START
,
5439 save
, EXT4_S_ERR_LEN
);
5444 ext4_msg(sb
, KERN_ERR
, "error loading journal");
5448 EXT4_SB(sb
)->s_journal
= journal
;
5449 err
= ext4_clear_journal_err(sb
, es
);
5451 EXT4_SB(sb
)->s_journal
= NULL
;
5452 jbd2_journal_destroy(journal
);
5456 if (!really_read_only
&& journal_devnum
&&
5457 journal_devnum
!= le32_to_cpu(es
->s_journal_dev
)) {
5458 es
->s_journal_dev
= cpu_to_le32(journal_devnum
);
5460 /* Make sure we flush the recovery flag to disk. */
5461 ext4_commit_super(sb
);
5467 jbd2_journal_destroy(journal
);
5471 /* Copy state of EXT4_SB(sb) into buffer for on-disk superblock */
5472 static void ext4_update_super(struct super_block
*sb
)
5474 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
5475 struct ext4_super_block
*es
= sbi
->s_es
;
5476 struct buffer_head
*sbh
= sbi
->s_sbh
;
5480 * If the file system is mounted read-only, don't update the
5481 * superblock write time. This avoids updating the superblock
5482 * write time when we are mounting the root file system
5483 * read/only but we need to replay the journal; at that point,
5484 * for people who are east of GMT and who make their clock
5485 * tick in localtime for Windows bug-for-bug compatibility,
5486 * the clock is set in the future, and this will cause e2fsck
5487 * to complain and force a full file system check.
5489 if (!(sb
->s_flags
& SB_RDONLY
))
5490 ext4_update_tstamp(es
, s_wtime
);
5491 es
->s_kbytes_written
=
5492 cpu_to_le64(sbi
->s_kbytes_written
+
5493 ((part_stat_read(sb
->s_bdev
, sectors
[STAT_WRITE
]) -
5494 sbi
->s_sectors_written_start
) >> 1));
5495 if (percpu_counter_initialized(&sbi
->s_freeclusters_counter
))
5496 ext4_free_blocks_count_set(es
,
5497 EXT4_C2B(sbi
, percpu_counter_sum_positive(
5498 &sbi
->s_freeclusters_counter
)));
5499 if (percpu_counter_initialized(&sbi
->s_freeinodes_counter
))
5500 es
->s_free_inodes_count
=
5501 cpu_to_le32(percpu_counter_sum_positive(
5502 &sbi
->s_freeinodes_counter
));
5503 /* Copy error information to the on-disk superblock */
5504 spin_lock(&sbi
->s_error_lock
);
5505 if (sbi
->s_add_error_count
> 0) {
5506 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
5507 if (!es
->s_first_error_time
&& !es
->s_first_error_time_hi
) {
5508 __ext4_update_tstamp(&es
->s_first_error_time
,
5509 &es
->s_first_error_time_hi
,
5510 sbi
->s_first_error_time
);
5511 strncpy(es
->s_first_error_func
, sbi
->s_first_error_func
,
5512 sizeof(es
->s_first_error_func
));
5513 es
->s_first_error_line
=
5514 cpu_to_le32(sbi
->s_first_error_line
);
5515 es
->s_first_error_ino
=
5516 cpu_to_le32(sbi
->s_first_error_ino
);
5517 es
->s_first_error_block
=
5518 cpu_to_le64(sbi
->s_first_error_block
);
5519 es
->s_first_error_errcode
=
5520 ext4_errno_to_code(sbi
->s_first_error_code
);
5522 __ext4_update_tstamp(&es
->s_last_error_time
,
5523 &es
->s_last_error_time_hi
,
5524 sbi
->s_last_error_time
);
5525 strncpy(es
->s_last_error_func
, sbi
->s_last_error_func
,
5526 sizeof(es
->s_last_error_func
));
5527 es
->s_last_error_line
= cpu_to_le32(sbi
->s_last_error_line
);
5528 es
->s_last_error_ino
= cpu_to_le32(sbi
->s_last_error_ino
);
5529 es
->s_last_error_block
= cpu_to_le64(sbi
->s_last_error_block
);
5530 es
->s_last_error_errcode
=
5531 ext4_errno_to_code(sbi
->s_last_error_code
);
5533 * Start the daily error reporting function if it hasn't been
5536 if (!es
->s_error_count
)
5537 mod_timer(&sbi
->s_err_report
, jiffies
+ 24*60*60*HZ
);
5538 le32_add_cpu(&es
->s_error_count
, sbi
->s_add_error_count
);
5539 sbi
->s_add_error_count
= 0;
5541 spin_unlock(&sbi
->s_error_lock
);
5543 ext4_superblock_csum_set(sb
);
5547 static int ext4_commit_super(struct super_block
*sb
)
5549 struct buffer_head
*sbh
= EXT4_SB(sb
)->s_sbh
;
5552 if (!sbh
|| block_device_ejected(sb
))
5555 ext4_update_super(sb
);
5557 if (buffer_write_io_error(sbh
) || !buffer_uptodate(sbh
)) {
5559 * Oh, dear. A previous attempt to write the
5560 * superblock failed. This could happen because the
5561 * USB device was yanked out. Or it could happen to
5562 * be a transient write error and maybe the block will
5563 * be remapped. Nothing we can do but to retry the
5564 * write and hope for the best.
5566 ext4_msg(sb
, KERN_ERR
, "previous I/O error to "
5567 "superblock detected");
5568 clear_buffer_write_io_error(sbh
);
5569 set_buffer_uptodate(sbh
);
5571 BUFFER_TRACE(sbh
, "marking dirty");
5572 mark_buffer_dirty(sbh
);
5573 error
= __sync_dirty_buffer(sbh
,
5574 REQ_SYNC
| (test_opt(sb
, BARRIER
) ? REQ_FUA
: 0));
5575 if (buffer_write_io_error(sbh
)) {
5576 ext4_msg(sb
, KERN_ERR
, "I/O error while writing "
5578 clear_buffer_write_io_error(sbh
);
5579 set_buffer_uptodate(sbh
);
5585 * Have we just finished recovery? If so, and if we are mounting (or
5586 * remounting) the filesystem readonly, then we will end up with a
5587 * consistent fs on disk. Record that fact.
5589 static int ext4_mark_recovery_complete(struct super_block
*sb
,
5590 struct ext4_super_block
*es
)
5593 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
5595 if (!ext4_has_feature_journal(sb
)) {
5596 if (journal
!= NULL
) {
5597 ext4_error(sb
, "Journal got removed while the fs was "
5599 return -EFSCORRUPTED
;
5603 jbd2_journal_lock_updates(journal
);
5604 err
= jbd2_journal_flush(journal
);
5608 if (ext4_has_feature_journal_needs_recovery(sb
) && sb_rdonly(sb
)) {
5609 ext4_clear_feature_journal_needs_recovery(sb
);
5610 ext4_commit_super(sb
);
5613 jbd2_journal_unlock_updates(journal
);
5618 * If we are mounting (or read-write remounting) a filesystem whose journal
5619 * has recorded an error from a previous lifetime, move that error to the
5620 * main filesystem now.
5622 static int ext4_clear_journal_err(struct super_block
*sb
,
5623 struct ext4_super_block
*es
)
5629 if (!ext4_has_feature_journal(sb
)) {
5630 ext4_error(sb
, "Journal got removed while the fs was mounted!");
5631 return -EFSCORRUPTED
;
5634 journal
= EXT4_SB(sb
)->s_journal
;
5637 * Now check for any error status which may have been recorded in the
5638 * journal by a prior ext4_error() or ext4_abort()
5641 j_errno
= jbd2_journal_errno(journal
);
5645 errstr
= ext4_decode_error(sb
, j_errno
, nbuf
);
5646 ext4_warning(sb
, "Filesystem error recorded "
5647 "from previous mount: %s", errstr
);
5648 ext4_warning(sb
, "Marking fs in need of filesystem check.");
5650 EXT4_SB(sb
)->s_mount_state
|= EXT4_ERROR_FS
;
5651 es
->s_state
|= cpu_to_le16(EXT4_ERROR_FS
);
5652 ext4_commit_super(sb
);
5654 jbd2_journal_clear_err(journal
);
5655 jbd2_journal_update_sb_errno(journal
);
5661 * Force the running and committing transactions to commit,
5662 * and wait on the commit.
5664 int ext4_force_commit(struct super_block
*sb
)
5671 journal
= EXT4_SB(sb
)->s_journal
;
5672 return ext4_journal_force_commit(journal
);
5675 static int ext4_sync_fs(struct super_block
*sb
, int wait
)
5679 bool needs_barrier
= false;
5680 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
5682 if (unlikely(ext4_forced_shutdown(sbi
)))
5685 trace_ext4_sync_fs(sb
, wait
);
5686 flush_workqueue(sbi
->rsv_conversion_wq
);
5688 * Writeback quota in non-journalled quota case - journalled quota has
5691 dquot_writeback_dquots(sb
, -1);
5693 * Data writeback is possible w/o journal transaction, so barrier must
5694 * being sent at the end of the function. But we can skip it if
5695 * transaction_commit will do it for us.
5697 if (sbi
->s_journal
) {
5698 target
= jbd2_get_latest_transaction(sbi
->s_journal
);
5699 if (wait
&& sbi
->s_journal
->j_flags
& JBD2_BARRIER
&&
5700 !jbd2_trans_will_send_data_barrier(sbi
->s_journal
, target
))
5701 needs_barrier
= true;
5703 if (jbd2_journal_start_commit(sbi
->s_journal
, &target
)) {
5705 ret
= jbd2_log_wait_commit(sbi
->s_journal
,
5708 } else if (wait
&& test_opt(sb
, BARRIER
))
5709 needs_barrier
= true;
5710 if (needs_barrier
) {
5712 err
= blkdev_issue_flush(sb
->s_bdev
, GFP_KERNEL
);
5721 * LVM calls this function before a (read-only) snapshot is created. This
5722 * gives us a chance to flush the journal completely and mark the fs clean.
5724 * Note that only this function cannot bring a filesystem to be in a clean
5725 * state independently. It relies on upper layer to stop all data & metadata
5728 static int ext4_freeze(struct super_block
*sb
)
5736 journal
= EXT4_SB(sb
)->s_journal
;
5739 /* Now we set up the journal barrier. */
5740 jbd2_journal_lock_updates(journal
);
5743 * Don't clear the needs_recovery flag if we failed to
5744 * flush the journal.
5746 error
= jbd2_journal_flush(journal
);
5750 /* Journal blocked and flushed, clear needs_recovery flag. */
5751 ext4_clear_feature_journal_needs_recovery(sb
);
5754 error
= ext4_commit_super(sb
);
5757 /* we rely on upper layer to stop further updates */
5758 jbd2_journal_unlock_updates(journal
);
5763 * Called by LVM after the snapshot is done. We need to reset the RECOVER
5764 * flag here, even though the filesystem is not technically dirty yet.
5766 static int ext4_unfreeze(struct super_block
*sb
)
5768 if (sb_rdonly(sb
) || ext4_forced_shutdown(EXT4_SB(sb
)))
5771 if (EXT4_SB(sb
)->s_journal
) {
5772 /* Reset the needs_recovery flag before the fs is unlocked. */
5773 ext4_set_feature_journal_needs_recovery(sb
);
5776 ext4_commit_super(sb
);
5781 * Structure to save mount options for ext4_remount's benefit
5783 struct ext4_mount_options
{
5784 unsigned long s_mount_opt
;
5785 unsigned long s_mount_opt2
;
5788 unsigned long s_commit_interval
;
5789 u32 s_min_batch_time
, s_max_batch_time
;
5792 char *s_qf_names
[EXT4_MAXQUOTAS
];
5796 static int ext4_remount(struct super_block
*sb
, int *flags
, char *data
)
5798 struct ext4_super_block
*es
;
5799 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
5800 unsigned long old_sb_flags
, vfs_flags
;
5801 struct ext4_mount_options old_opts
;
5802 int enable_quota
= 0;
5804 unsigned int journal_ioprio
= DEFAULT_JOURNAL_IOPRIO
;
5808 char *to_free
[EXT4_MAXQUOTAS
];
5810 char *orig_data
= kstrdup(data
, GFP_KERNEL
);
5812 if (data
&& !orig_data
)
5815 /* Store the original options */
5816 old_sb_flags
= sb
->s_flags
;
5817 old_opts
.s_mount_opt
= sbi
->s_mount_opt
;
5818 old_opts
.s_mount_opt2
= sbi
->s_mount_opt2
;
5819 old_opts
.s_resuid
= sbi
->s_resuid
;
5820 old_opts
.s_resgid
= sbi
->s_resgid
;
5821 old_opts
.s_commit_interval
= sbi
->s_commit_interval
;
5822 old_opts
.s_min_batch_time
= sbi
->s_min_batch_time
;
5823 old_opts
.s_max_batch_time
= sbi
->s_max_batch_time
;
5825 old_opts
.s_jquota_fmt
= sbi
->s_jquota_fmt
;
5826 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
5827 if (sbi
->s_qf_names
[i
]) {
5828 char *qf_name
= get_qf_name(sb
, sbi
, i
);
5830 old_opts
.s_qf_names
[i
] = kstrdup(qf_name
, GFP_KERNEL
);
5831 if (!old_opts
.s_qf_names
[i
]) {
5832 for (j
= 0; j
< i
; j
++)
5833 kfree(old_opts
.s_qf_names
[j
]);
5838 old_opts
.s_qf_names
[i
] = NULL
;
5840 if (sbi
->s_journal
&& sbi
->s_journal
->j_task
->io_context
)
5841 journal_ioprio
= sbi
->s_journal
->j_task
->io_context
->ioprio
;
5844 * Some options can be enabled by ext4 and/or by VFS mount flag
5845 * either way we need to make sure it matches in both *flags and
5846 * s_flags. Copy those selected flags from *flags to s_flags
5848 vfs_flags
= SB_LAZYTIME
| SB_I_VERSION
;
5849 sb
->s_flags
= (sb
->s_flags
& ~vfs_flags
) | (*flags
& vfs_flags
);
5851 if (!parse_options(data
, sb
, NULL
, &journal_ioprio
, 1)) {
5856 if ((old_opts
.s_mount_opt
& EXT4_MOUNT_JOURNAL_CHECKSUM
) ^
5857 test_opt(sb
, JOURNAL_CHECKSUM
)) {
5858 ext4_msg(sb
, KERN_ERR
, "changing journal_checksum "
5859 "during remount not supported; ignoring");
5860 sbi
->s_mount_opt
^= EXT4_MOUNT_JOURNAL_CHECKSUM
;
5863 if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_JOURNAL_DATA
) {
5864 if (test_opt2(sb
, EXPLICIT_DELALLOC
)) {
5865 ext4_msg(sb
, KERN_ERR
, "can't mount with "
5866 "both data=journal and delalloc");
5870 if (test_opt(sb
, DIOREAD_NOLOCK
)) {
5871 ext4_msg(sb
, KERN_ERR
, "can't mount with "
5872 "both data=journal and dioread_nolock");
5876 } else if (test_opt(sb
, DATA_FLAGS
) == EXT4_MOUNT_ORDERED_DATA
) {
5877 if (test_opt(sb
, JOURNAL_ASYNC_COMMIT
)) {
5878 ext4_msg(sb
, KERN_ERR
, "can't mount with "
5879 "journal_async_commit in data=ordered mode");
5885 if ((sbi
->s_mount_opt
^ old_opts
.s_mount_opt
) & EXT4_MOUNT_NO_MBCACHE
) {
5886 ext4_msg(sb
, KERN_ERR
, "can't enable nombcache during remount");
5891 if (ext4_test_mount_flag(sb
, EXT4_MF_FS_ABORTED
))
5892 ext4_abort(sb
, EXT4_ERR_ESHUTDOWN
, "Abort forced by user");
5894 sb
->s_flags
= (sb
->s_flags
& ~SB_POSIXACL
) |
5895 (test_opt(sb
, POSIX_ACL
) ? SB_POSIXACL
: 0);
5899 if (sbi
->s_journal
) {
5900 ext4_init_journal_params(sb
, sbi
->s_journal
);
5901 set_task_ioprio(sbi
->s_journal
->j_task
, journal_ioprio
);
5904 /* Flush outstanding errors before changing fs state */
5905 flush_work(&sbi
->s_error_work
);
5907 if ((bool)(*flags
& SB_RDONLY
) != sb_rdonly(sb
)) {
5908 if (ext4_test_mount_flag(sb
, EXT4_MF_FS_ABORTED
)) {
5913 if (*flags
& SB_RDONLY
) {
5914 err
= sync_filesystem(sb
);
5917 err
= dquot_suspend(sb
, -1);
5922 * First of all, the unconditional stuff we have to do
5923 * to disable replay of the journal when we next remount
5925 sb
->s_flags
|= SB_RDONLY
;
5928 * OK, test if we are remounting a valid rw partition
5929 * readonly, and if so set the rdonly flag and then
5930 * mark the partition as valid again.
5932 if (!(es
->s_state
& cpu_to_le16(EXT4_VALID_FS
)) &&
5933 (sbi
->s_mount_state
& EXT4_VALID_FS
))
5934 es
->s_state
= cpu_to_le16(sbi
->s_mount_state
);
5936 if (sbi
->s_journal
) {
5938 * We let remount-ro finish even if marking fs
5939 * as clean failed...
5941 ext4_mark_recovery_complete(sb
, es
);
5944 kthread_stop(sbi
->s_mmp_tsk
);
5946 /* Make sure we can mount this feature set readwrite */
5947 if (ext4_has_feature_readonly(sb
) ||
5948 !ext4_feature_set_ok(sb
, 0)) {
5953 * Make sure the group descriptor checksums
5954 * are sane. If they aren't, refuse to remount r/w.
5956 for (g
= 0; g
< sbi
->s_groups_count
; g
++) {
5957 struct ext4_group_desc
*gdp
=
5958 ext4_get_group_desc(sb
, g
, NULL
);
5960 if (!ext4_group_desc_csum_verify(sb
, g
, gdp
)) {
5961 ext4_msg(sb
, KERN_ERR
,
5962 "ext4_remount: Checksum for group %u failed (%u!=%u)",
5963 g
, le16_to_cpu(ext4_group_desc_csum(sb
, g
, gdp
)),
5964 le16_to_cpu(gdp
->bg_checksum
));
5971 * If we have an unprocessed orphan list hanging
5972 * around from a previously readonly bdev mount,
5973 * require a full umount/remount for now.
5975 if (es
->s_last_orphan
) {
5976 ext4_msg(sb
, KERN_WARNING
, "Couldn't "
5977 "remount RDWR because of unprocessed "
5978 "orphan inode list. Please "
5979 "umount/remount instead");
5985 * Mounting a RDONLY partition read-write, so reread
5986 * and store the current valid flag. (It may have
5987 * been changed by e2fsck since we originally mounted
5990 if (sbi
->s_journal
) {
5991 err
= ext4_clear_journal_err(sb
, es
);
5995 sbi
->s_mount_state
= le16_to_cpu(es
->s_state
);
5997 err
= ext4_setup_super(sb
, es
, 0);
6001 sb
->s_flags
&= ~SB_RDONLY
;
6002 if (ext4_has_feature_mmp(sb
))
6003 if (ext4_multi_mount_protect(sb
,
6004 le64_to_cpu(es
->s_mmp_block
))) {
6013 * Reinitialize lazy itable initialization thread based on
6016 if (sb_rdonly(sb
) || !test_opt(sb
, INIT_INODE_TABLE
))
6017 ext4_unregister_li_request(sb
);
6019 ext4_group_t first_not_zeroed
;
6020 first_not_zeroed
= ext4_has_uninit_itable(sb
);
6021 ext4_register_li_request(sb
, first_not_zeroed
);
6025 * Handle creation of system zone data early because it can fail.
6026 * Releasing of existing data is done when we are sure remount will
6029 if (test_opt(sb
, BLOCK_VALIDITY
) && !sbi
->s_system_blks
) {
6030 err
= ext4_setup_system_zone(sb
);
6035 if (sbi
->s_journal
== NULL
&& !(old_sb_flags
& SB_RDONLY
)) {
6036 err
= ext4_commit_super(sb
);
6042 /* Release old quota file names */
6043 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
6044 kfree(old_opts
.s_qf_names
[i
]);
6046 if (sb_any_quota_suspended(sb
))
6047 dquot_resume(sb
, -1);
6048 else if (ext4_has_feature_quota(sb
)) {
6049 err
= ext4_enable_quotas(sb
);
6055 if (!test_opt(sb
, BLOCK_VALIDITY
) && sbi
->s_system_blks
)
6056 ext4_release_system_zone(sb
);
6059 * Some options can be enabled by ext4 and/or by VFS mount flag
6060 * either way we need to make sure it matches in both *flags and
6061 * s_flags. Copy those selected flags from s_flags to *flags
6063 *flags
= (*flags
& ~vfs_flags
) | (sb
->s_flags
& vfs_flags
);
6065 ext4_msg(sb
, KERN_INFO
, "re-mounted. Opts: %s. Quota mode: %s.",
6066 orig_data
, ext4_quota_mode(sb
));
6071 sb
->s_flags
= old_sb_flags
;
6072 sbi
->s_mount_opt
= old_opts
.s_mount_opt
;
6073 sbi
->s_mount_opt2
= old_opts
.s_mount_opt2
;
6074 sbi
->s_resuid
= old_opts
.s_resuid
;
6075 sbi
->s_resgid
= old_opts
.s_resgid
;
6076 sbi
->s_commit_interval
= old_opts
.s_commit_interval
;
6077 sbi
->s_min_batch_time
= old_opts
.s_min_batch_time
;
6078 sbi
->s_max_batch_time
= old_opts
.s_max_batch_time
;
6079 if (!test_opt(sb
, BLOCK_VALIDITY
) && sbi
->s_system_blks
)
6080 ext4_release_system_zone(sb
);
6082 sbi
->s_jquota_fmt
= old_opts
.s_jquota_fmt
;
6083 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++) {
6084 to_free
[i
] = get_qf_name(sb
, sbi
, i
);
6085 rcu_assign_pointer(sbi
->s_qf_names
[i
], old_opts
.s_qf_names
[i
]);
6088 for (i
= 0; i
< EXT4_MAXQUOTAS
; i
++)
6096 static int ext4_statfs_project(struct super_block
*sb
,
6097 kprojid_t projid
, struct kstatfs
*buf
)
6100 struct dquot
*dquot
;
6104 qid
= make_kqid_projid(projid
);
6105 dquot
= dqget(sb
, qid
);
6107 return PTR_ERR(dquot
);
6108 spin_lock(&dquot
->dq_dqb_lock
);
6110 limit
= min_not_zero(dquot
->dq_dqb
.dqb_bsoftlimit
,
6111 dquot
->dq_dqb
.dqb_bhardlimit
);
6112 limit
>>= sb
->s_blocksize_bits
;
6114 if (limit
&& buf
->f_blocks
> limit
) {
6115 curblock
= (dquot
->dq_dqb
.dqb_curspace
+
6116 dquot
->dq_dqb
.dqb_rsvspace
) >> sb
->s_blocksize_bits
;
6117 buf
->f_blocks
= limit
;
6118 buf
->f_bfree
= buf
->f_bavail
=
6119 (buf
->f_blocks
> curblock
) ?
6120 (buf
->f_blocks
- curblock
) : 0;
6123 limit
= min_not_zero(dquot
->dq_dqb
.dqb_isoftlimit
,
6124 dquot
->dq_dqb
.dqb_ihardlimit
);
6125 if (limit
&& buf
->f_files
> limit
) {
6126 buf
->f_files
= limit
;
6128 (buf
->f_files
> dquot
->dq_dqb
.dqb_curinodes
) ?
6129 (buf
->f_files
- dquot
->dq_dqb
.dqb_curinodes
) : 0;
6132 spin_unlock(&dquot
->dq_dqb_lock
);
6138 static int ext4_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
6140 struct super_block
*sb
= dentry
->d_sb
;
6141 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
6142 struct ext4_super_block
*es
= sbi
->s_es
;
6143 ext4_fsblk_t overhead
= 0, resv_blocks
;
6146 resv_blocks
= EXT4_C2B(sbi
, atomic64_read(&sbi
->s_resv_clusters
));
6148 if (!test_opt(sb
, MINIX_DF
))
6149 overhead
= sbi
->s_overhead
;
6151 buf
->f_type
= EXT4_SUPER_MAGIC
;
6152 buf
->f_bsize
= sb
->s_blocksize
;
6153 buf
->f_blocks
= ext4_blocks_count(es
) - EXT4_C2B(sbi
, overhead
);
6154 bfree
= percpu_counter_sum_positive(&sbi
->s_freeclusters_counter
) -
6155 percpu_counter_sum_positive(&sbi
->s_dirtyclusters_counter
);
6156 /* prevent underflow in case that few free space is available */
6157 buf
->f_bfree
= EXT4_C2B(sbi
, max_t(s64
, bfree
, 0));
6158 buf
->f_bavail
= buf
->f_bfree
-
6159 (ext4_r_blocks_count(es
) + resv_blocks
);
6160 if (buf
->f_bfree
< (ext4_r_blocks_count(es
) + resv_blocks
))
6162 buf
->f_files
= le32_to_cpu(es
->s_inodes_count
);
6163 buf
->f_ffree
= percpu_counter_sum_positive(&sbi
->s_freeinodes_counter
);
6164 buf
->f_namelen
= EXT4_NAME_LEN
;
6165 fsid
= le64_to_cpup((void *)es
->s_uuid
) ^
6166 le64_to_cpup((void *)es
->s_uuid
+ sizeof(u64
));
6167 buf
->f_fsid
= u64_to_fsid(fsid
);
6170 if (ext4_test_inode_flag(dentry
->d_inode
, EXT4_INODE_PROJINHERIT
) &&
6171 sb_has_quota_limits_enabled(sb
, PRJQUOTA
))
6172 ext4_statfs_project(sb
, EXT4_I(dentry
->d_inode
)->i_projid
, buf
);
6181 * Helper functions so that transaction is started before we acquire dqio_sem
6182 * to keep correct lock ordering of transaction > dqio_sem
6184 static inline struct inode
*dquot_to_inode(struct dquot
*dquot
)
6186 return sb_dqopt(dquot
->dq_sb
)->files
[dquot
->dq_id
.type
];
6189 static int ext4_write_dquot(struct dquot
*dquot
)
6193 struct inode
*inode
;
6195 inode
= dquot_to_inode(dquot
);
6196 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
,
6197 EXT4_QUOTA_TRANS_BLOCKS(dquot
->dq_sb
));
6199 return PTR_ERR(handle
);
6200 ret
= dquot_commit(dquot
);
6201 err
= ext4_journal_stop(handle
);
6207 static int ext4_acquire_dquot(struct dquot
*dquot
)
6212 handle
= ext4_journal_start(dquot_to_inode(dquot
), EXT4_HT_QUOTA
,
6213 EXT4_QUOTA_INIT_BLOCKS(dquot
->dq_sb
));
6215 return PTR_ERR(handle
);
6216 ret
= dquot_acquire(dquot
);
6217 err
= ext4_journal_stop(handle
);
6223 static int ext4_release_dquot(struct dquot
*dquot
)
6228 handle
= ext4_journal_start(dquot_to_inode(dquot
), EXT4_HT_QUOTA
,
6229 EXT4_QUOTA_DEL_BLOCKS(dquot
->dq_sb
));
6230 if (IS_ERR(handle
)) {
6231 /* Release dquot anyway to avoid endless cycle in dqput() */
6232 dquot_release(dquot
);
6233 return PTR_ERR(handle
);
6235 ret
= dquot_release(dquot
);
6236 err
= ext4_journal_stop(handle
);
6242 static int ext4_mark_dquot_dirty(struct dquot
*dquot
)
6244 struct super_block
*sb
= dquot
->dq_sb
;
6246 if (ext4_is_quota_journalled(sb
)) {
6247 dquot_mark_dquot_dirty(dquot
);
6248 return ext4_write_dquot(dquot
);
6250 return dquot_mark_dquot_dirty(dquot
);
6254 static int ext4_write_info(struct super_block
*sb
, int type
)
6259 /* Data block + inode block */
6260 handle
= ext4_journal_start(d_inode(sb
->s_root
), EXT4_HT_QUOTA
, 2);
6262 return PTR_ERR(handle
);
6263 ret
= dquot_commit_info(sb
, type
);
6264 err
= ext4_journal_stop(handle
);
6271 * Turn on quotas during mount time - we need to find
6272 * the quota file and such...
6274 static int ext4_quota_on_mount(struct super_block
*sb
, int type
)
6276 return dquot_quota_on_mount(sb
, get_qf_name(sb
, EXT4_SB(sb
), type
),
6277 EXT4_SB(sb
)->s_jquota_fmt
, type
);
6280 static void lockdep_set_quota_inode(struct inode
*inode
, int subclass
)
6282 struct ext4_inode_info
*ei
= EXT4_I(inode
);
6284 /* The first argument of lockdep_set_subclass has to be
6285 * *exactly* the same as the argument to init_rwsem() --- in
6286 * this case, in init_once() --- or lockdep gets unhappy
6287 * because the name of the lock is set using the
6288 * stringification of the argument to init_rwsem().
6290 (void) ei
; /* shut up clang warning if !CONFIG_LOCKDEP */
6291 lockdep_set_subclass(&ei
->i_data_sem
, subclass
);
6295 * Standard function to be called on quota_on
6297 static int ext4_quota_on(struct super_block
*sb
, int type
, int format_id
,
6298 const struct path
*path
)
6302 if (!test_opt(sb
, QUOTA
))
6305 /* Quotafile not on the same filesystem? */
6306 if (path
->dentry
->d_sb
!= sb
)
6309 /* Quota already enabled for this file? */
6310 if (IS_NOQUOTA(d_inode(path
->dentry
)))
6313 /* Journaling quota? */
6314 if (EXT4_SB(sb
)->s_qf_names
[type
]) {
6315 /* Quotafile not in fs root? */
6316 if (path
->dentry
->d_parent
!= sb
->s_root
)
6317 ext4_msg(sb
, KERN_WARNING
,
6318 "Quota file not on filesystem root. "
6319 "Journaled quota will not work");
6320 sb_dqopt(sb
)->flags
|= DQUOT_NOLIST_DIRTY
;
6323 * Clear the flag just in case mount options changed since
6326 sb_dqopt(sb
)->flags
&= ~DQUOT_NOLIST_DIRTY
;
6330 * When we journal data on quota file, we have to flush journal to see
6331 * all updates to the file when we bypass pagecache...
6333 if (EXT4_SB(sb
)->s_journal
&&
6334 ext4_should_journal_data(d_inode(path
->dentry
))) {
6336 * We don't need to lock updates but journal_flush() could
6337 * otherwise be livelocked...
6339 jbd2_journal_lock_updates(EXT4_SB(sb
)->s_journal
);
6340 err
= jbd2_journal_flush(EXT4_SB(sb
)->s_journal
);
6341 jbd2_journal_unlock_updates(EXT4_SB(sb
)->s_journal
);
6346 lockdep_set_quota_inode(path
->dentry
->d_inode
, I_DATA_SEM_QUOTA
);
6347 err
= dquot_quota_on(sb
, type
, format_id
, path
);
6349 lockdep_set_quota_inode(path
->dentry
->d_inode
,
6352 struct inode
*inode
= d_inode(path
->dentry
);
6356 * Set inode flags to prevent userspace from messing with quota
6357 * files. If this fails, we return success anyway since quotas
6358 * are already enabled and this is not a hard failure.
6361 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
, 1);
6364 EXT4_I(inode
)->i_flags
|= EXT4_NOATIME_FL
| EXT4_IMMUTABLE_FL
;
6365 inode_set_flags(inode
, S_NOATIME
| S_IMMUTABLE
,
6366 S_NOATIME
| S_IMMUTABLE
);
6367 err
= ext4_mark_inode_dirty(handle
, inode
);
6368 ext4_journal_stop(handle
);
6370 inode_unlock(inode
);
6375 static int ext4_quota_enable(struct super_block
*sb
, int type
, int format_id
,
6379 struct inode
*qf_inode
;
6380 unsigned long qf_inums
[EXT4_MAXQUOTAS
] = {
6381 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
6382 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
),
6383 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_prj_quota_inum
)
6386 BUG_ON(!ext4_has_feature_quota(sb
));
6388 if (!qf_inums
[type
])
6391 qf_inode
= ext4_iget(sb
, qf_inums
[type
], EXT4_IGET_SPECIAL
);
6392 if (IS_ERR(qf_inode
)) {
6393 ext4_error(sb
, "Bad quota inode # %lu", qf_inums
[type
]);
6394 return PTR_ERR(qf_inode
);
6397 /* Don't account quota for quota files to avoid recursion */
6398 qf_inode
->i_flags
|= S_NOQUOTA
;
6399 lockdep_set_quota_inode(qf_inode
, I_DATA_SEM_QUOTA
);
6400 err
= dquot_load_quota_inode(qf_inode
, type
, format_id
, flags
);
6402 lockdep_set_quota_inode(qf_inode
, I_DATA_SEM_NORMAL
);
6408 /* Enable usage tracking for all quota types. */
6409 static int ext4_enable_quotas(struct super_block
*sb
)
6412 unsigned long qf_inums
[EXT4_MAXQUOTAS
] = {
6413 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_usr_quota_inum
),
6414 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_grp_quota_inum
),
6415 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_prj_quota_inum
)
6417 bool quota_mopt
[EXT4_MAXQUOTAS
] = {
6418 test_opt(sb
, USRQUOTA
),
6419 test_opt(sb
, GRPQUOTA
),
6420 test_opt(sb
, PRJQUOTA
),
6423 sb_dqopt(sb
)->flags
|= DQUOT_QUOTA_SYS_FILE
| DQUOT_NOLIST_DIRTY
;
6424 for (type
= 0; type
< EXT4_MAXQUOTAS
; type
++) {
6425 if (qf_inums
[type
]) {
6426 err
= ext4_quota_enable(sb
, type
, QFMT_VFS_V1
,
6427 DQUOT_USAGE_ENABLED
|
6428 (quota_mopt
[type
] ? DQUOT_LIMITS_ENABLED
: 0));
6431 "Failed to enable quota tracking "
6432 "(type=%d, err=%d). Please run "
6433 "e2fsck to fix.", type
, err
);
6434 for (type
--; type
>= 0; type
--)
6435 dquot_quota_off(sb
, type
);
6444 static int ext4_quota_off(struct super_block
*sb
, int type
)
6446 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
6450 /* Force all delayed allocation blocks to be allocated.
6451 * Caller already holds s_umount sem */
6452 if (test_opt(sb
, DELALLOC
))
6453 sync_filesystem(sb
);
6455 if (!inode
|| !igrab(inode
))
6458 err
= dquot_quota_off(sb
, type
);
6459 if (err
|| ext4_has_feature_quota(sb
))
6464 * Update modification times of quota files when userspace can
6465 * start looking at them. If we fail, we return success anyway since
6466 * this is not a hard failure and quotas are already disabled.
6468 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
, 1);
6469 if (IS_ERR(handle
)) {
6470 err
= PTR_ERR(handle
);
6473 EXT4_I(inode
)->i_flags
&= ~(EXT4_NOATIME_FL
| EXT4_IMMUTABLE_FL
);
6474 inode_set_flags(inode
, 0, S_NOATIME
| S_IMMUTABLE
);
6475 inode
->i_mtime
= inode
->i_ctime
= current_time(inode
);
6476 err
= ext4_mark_inode_dirty(handle
, inode
);
6477 ext4_journal_stop(handle
);
6479 inode_unlock(inode
);
6481 lockdep_set_quota_inode(inode
, I_DATA_SEM_NORMAL
);
6485 return dquot_quota_off(sb
, type
);
6488 /* Read data from quotafile - avoid pagecache and such because we cannot afford
6489 * acquiring the locks... As quota files are never truncated and quota code
6490 * itself serializes the operations (and no one else should touch the files)
6491 * we don't have to be afraid of races */
6492 static ssize_t
ext4_quota_read(struct super_block
*sb
, int type
, char *data
,
6493 size_t len
, loff_t off
)
6495 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
6496 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
6497 int offset
= off
& (sb
->s_blocksize
- 1);
6500 struct buffer_head
*bh
;
6501 loff_t i_size
= i_size_read(inode
);
6505 if (off
+len
> i_size
)
6508 while (toread
> 0) {
6509 tocopy
= sb
->s_blocksize
- offset
< toread
?
6510 sb
->s_blocksize
- offset
: toread
;
6511 bh
= ext4_bread(NULL
, inode
, blk
, 0);
6514 if (!bh
) /* A hole? */
6515 memset(data
, 0, tocopy
);
6517 memcpy(data
, bh
->b_data
+offset
, tocopy
);
6527 /* Write to quotafile (we know the transaction is already started and has
6528 * enough credits) */
6529 static ssize_t
ext4_quota_write(struct super_block
*sb
, int type
,
6530 const char *data
, size_t len
, loff_t off
)
6532 struct inode
*inode
= sb_dqopt(sb
)->files
[type
];
6533 ext4_lblk_t blk
= off
>> EXT4_BLOCK_SIZE_BITS(sb
);
6534 int err
= 0, err2
= 0, offset
= off
& (sb
->s_blocksize
- 1);
6536 struct buffer_head
*bh
;
6537 handle_t
*handle
= journal_current_handle();
6539 if (EXT4_SB(sb
)->s_journal
&& !handle
) {
6540 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
6541 " cancelled because transaction is not started",
6542 (unsigned long long)off
, (unsigned long long)len
);
6546 * Since we account only one data block in transaction credits,
6547 * then it is impossible to cross a block boundary.
6549 if (sb
->s_blocksize
- offset
< len
) {
6550 ext4_msg(sb
, KERN_WARNING
, "Quota write (off=%llu, len=%llu)"
6551 " cancelled because not block aligned",
6552 (unsigned long long)off
, (unsigned long long)len
);
6557 bh
= ext4_bread(handle
, inode
, blk
,
6558 EXT4_GET_BLOCKS_CREATE
|
6559 EXT4_GET_BLOCKS_METADATA_NOFAIL
);
6560 } while (PTR_ERR(bh
) == -ENOSPC
&&
6561 ext4_should_retry_alloc(inode
->i_sb
, &retries
));
6566 BUFFER_TRACE(bh
, "get write access");
6567 err
= ext4_journal_get_write_access(handle
, bh
);
6573 memcpy(bh
->b_data
+offset
, data
, len
);
6574 flush_dcache_page(bh
->b_page
);
6576 err
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
6579 if (inode
->i_size
< off
+ len
) {
6580 i_size_write(inode
, off
+ len
);
6581 EXT4_I(inode
)->i_disksize
= inode
->i_size
;
6582 err2
= ext4_mark_inode_dirty(handle
, inode
);
6583 if (unlikely(err2
&& !err
))
6586 return err
? err
: len
;
6590 static struct dentry
*ext4_mount(struct file_system_type
*fs_type
, int flags
,
6591 const char *dev_name
, void *data
)
6593 return mount_bdev(fs_type
, flags
, dev_name
, data
, ext4_fill_super
);
6596 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
6597 static inline void register_as_ext2(void)
6599 int err
= register_filesystem(&ext2_fs_type
);
6602 "EXT4-fs: Unable to register as ext2 (%d)\n", err
);
6605 static inline void unregister_as_ext2(void)
6607 unregister_filesystem(&ext2_fs_type
);
6610 static inline int ext2_feature_set_ok(struct super_block
*sb
)
6612 if (ext4_has_unknown_ext2_incompat_features(sb
))
6616 if (ext4_has_unknown_ext2_ro_compat_features(sb
))
6621 static inline void register_as_ext2(void) { }
6622 static inline void unregister_as_ext2(void) { }
6623 static inline int ext2_feature_set_ok(struct super_block
*sb
) { return 0; }
6626 static inline void register_as_ext3(void)
6628 int err
= register_filesystem(&ext3_fs_type
);
6631 "EXT4-fs: Unable to register as ext3 (%d)\n", err
);
6634 static inline void unregister_as_ext3(void)
6636 unregister_filesystem(&ext3_fs_type
);
6639 static inline int ext3_feature_set_ok(struct super_block
*sb
)
6641 if (ext4_has_unknown_ext3_incompat_features(sb
))
6643 if (!ext4_has_feature_journal(sb
))
6647 if (ext4_has_unknown_ext3_ro_compat_features(sb
))
6652 static struct file_system_type ext4_fs_type
= {
6653 .owner
= THIS_MODULE
,
6655 .mount
= ext4_mount
,
6656 .kill_sb
= kill_block_super
,
6657 .fs_flags
= FS_REQUIRES_DEV
,
6659 MODULE_ALIAS_FS("ext4");
6661 /* Shared across all ext4 file systems */
6662 wait_queue_head_t ext4__ioend_wq
[EXT4_WQ_HASH_SZ
];
6664 static int __init
ext4_init_fs(void)
6668 ratelimit_state_init(&ext4_mount_msg_ratelimit
, 30 * HZ
, 64);
6669 ext4_li_info
= NULL
;
6670 mutex_init(&ext4_li_mtx
);
6672 /* Build-time check for flags consistency */
6673 ext4_check_flag_values();
6675 for (i
= 0; i
< EXT4_WQ_HASH_SZ
; i
++)
6676 init_waitqueue_head(&ext4__ioend_wq
[i
]);
6678 err
= ext4_init_es();
6682 err
= ext4_init_pending();
6686 err
= ext4_init_post_read_processing();
6690 err
= ext4_init_pageio();
6694 err
= ext4_init_system_zone();
6698 err
= ext4_init_sysfs();
6702 err
= ext4_init_mballoc();
6705 err
= init_inodecache();
6709 err
= ext4_fc_init_dentry_cache();
6715 err
= register_filesystem(&ext4_fs_type
);
6721 unregister_as_ext2();
6722 unregister_as_ext3();
6724 destroy_inodecache();
6726 ext4_exit_mballoc();
6730 ext4_exit_system_zone();
6734 ext4_exit_post_read_processing();
6736 ext4_exit_pending();
6743 static void __exit
ext4_exit_fs(void)
6745 ext4_destroy_lazyinit_thread();
6746 unregister_as_ext2();
6747 unregister_as_ext3();
6748 unregister_filesystem(&ext4_fs_type
);
6749 destroy_inodecache();
6750 ext4_exit_mballoc();
6752 ext4_exit_system_zone();
6754 ext4_exit_post_read_processing();
6756 ext4_exit_pending();
6759 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
6760 MODULE_DESCRIPTION("Fourth Extended Filesystem");
6761 MODULE_LICENSE("GPL");
6762 MODULE_SOFTDEP("pre: crc32c");
6763 module_init(ext4_init_fs
)
6764 module_exit(ext4_exit_fs
)