1 // SPDX-License-Identifier: GPL-2.0
3 * linux/fs/ext4/inode.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 * 64-bit file support on 64-bit platforms by Jakub Jelinek
17 * (jj@sunsite.ms.mff.cuni.cz)
19 * Assorted race fixes, rewrite of ext4_get_block() by Al Viro, 2000
23 #include <linux/time.h>
24 #include <linux/highuid.h>
25 #include <linux/pagemap.h>
26 #include <linux/dax.h>
27 #include <linux/quotaops.h>
28 #include <linux/string.h>
29 #include <linux/buffer_head.h>
30 #include <linux/writeback.h>
31 #include <linux/pagevec.h>
32 #include <linux/mpage.h>
33 #include <linux/namei.h>
34 #include <linux/uio.h>
35 #include <linux/bio.h>
36 #include <linux/workqueue.h>
37 #include <linux/kernel.h>
38 #include <linux/printk.h>
39 #include <linux/slab.h>
40 #include <linux/bitops.h>
41 #include <linux/iomap.h>
43 #include "ext4_jbd2.h"
48 #include <trace/events/ext4.h>
50 #define MPAGE_DA_EXTENT_TAIL 0x01
52 static __u32
ext4_inode_csum(struct inode
*inode
, struct ext4_inode
*raw
,
53 struct ext4_inode_info
*ei
)
55 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
58 int offset
= offsetof(struct ext4_inode
, i_checksum_lo
);
59 unsigned int csum_size
= sizeof(dummy_csum
);
61 csum
= ext4_chksum(sbi
, ei
->i_csum_seed
, (__u8
*)raw
, offset
);
62 csum
= ext4_chksum(sbi
, csum
, (__u8
*)&dummy_csum
, csum_size
);
64 csum
= ext4_chksum(sbi
, csum
, (__u8
*)raw
+ offset
,
65 EXT4_GOOD_OLD_INODE_SIZE
- offset
);
67 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
) {
68 offset
= offsetof(struct ext4_inode
, i_checksum_hi
);
69 csum
= ext4_chksum(sbi
, csum
, (__u8
*)raw
+
70 EXT4_GOOD_OLD_INODE_SIZE
,
71 offset
- EXT4_GOOD_OLD_INODE_SIZE
);
72 if (EXT4_FITS_IN_INODE(raw
, ei
, i_checksum_hi
)) {
73 csum
= ext4_chksum(sbi
, csum
, (__u8
*)&dummy_csum
,
77 csum
= ext4_chksum(sbi
, csum
, (__u8
*)raw
+ offset
,
78 EXT4_INODE_SIZE(inode
->i_sb
) - offset
);
84 static int ext4_inode_csum_verify(struct inode
*inode
, struct ext4_inode
*raw
,
85 struct ext4_inode_info
*ei
)
87 __u32 provided
, calculated
;
89 if (EXT4_SB(inode
->i_sb
)->s_es
->s_creator_os
!=
90 cpu_to_le32(EXT4_OS_LINUX
) ||
91 !ext4_has_metadata_csum(inode
->i_sb
))
94 provided
= le16_to_cpu(raw
->i_checksum_lo
);
95 calculated
= ext4_inode_csum(inode
, raw
, ei
);
96 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
&&
97 EXT4_FITS_IN_INODE(raw
, ei
, i_checksum_hi
))
98 provided
|= ((__u32
)le16_to_cpu(raw
->i_checksum_hi
)) << 16;
100 calculated
&= 0xFFFF;
102 return provided
== calculated
;
105 static void ext4_inode_csum_set(struct inode
*inode
, struct ext4_inode
*raw
,
106 struct ext4_inode_info
*ei
)
110 if (EXT4_SB(inode
->i_sb
)->s_es
->s_creator_os
!=
111 cpu_to_le32(EXT4_OS_LINUX
) ||
112 !ext4_has_metadata_csum(inode
->i_sb
))
115 csum
= ext4_inode_csum(inode
, raw
, ei
);
116 raw
->i_checksum_lo
= cpu_to_le16(csum
& 0xFFFF);
117 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
&&
118 EXT4_FITS_IN_INODE(raw
, ei
, i_checksum_hi
))
119 raw
->i_checksum_hi
= cpu_to_le16(csum
>> 16);
122 static inline int ext4_begin_ordered_truncate(struct inode
*inode
,
125 trace_ext4_begin_ordered_truncate(inode
, new_size
);
127 * If jinode is zero, then we never opened the file for
128 * writing, so there's no need to call
129 * jbd2_journal_begin_ordered_truncate() since there's no
130 * outstanding writes we need to flush.
132 if (!EXT4_I(inode
)->jinode
)
134 return jbd2_journal_begin_ordered_truncate(EXT4_JOURNAL(inode
),
135 EXT4_I(inode
)->jinode
,
139 static void ext4_invalidatepage(struct page
*page
, unsigned int offset
,
140 unsigned int length
);
141 static int __ext4_journalled_writepage(struct page
*page
, unsigned int len
);
142 static int ext4_bh_delay_or_unwritten(handle_t
*handle
, struct buffer_head
*bh
);
143 static int ext4_meta_trans_blocks(struct inode
*inode
, int lblocks
,
147 * Test whether an inode is a fast symlink.
148 * A fast symlink has its symlink data stored in ext4_inode_info->i_data.
150 int ext4_inode_is_fast_symlink(struct inode
*inode
)
152 return S_ISLNK(inode
->i_mode
) && inode
->i_size
&&
153 (inode
->i_size
< EXT4_N_BLOCKS
* 4);
157 * Restart the transaction associated with *handle. This does a commit,
158 * so before we call here everything must be consistently dirtied against
161 int ext4_truncate_restart_trans(handle_t
*handle
, struct inode
*inode
,
167 * Drop i_data_sem to avoid deadlock with ext4_map_blocks. At this
168 * moment, get_block can be called only for blocks inside i_size since
169 * page cache has been already dropped and writes are blocked by
170 * i_mutex. So we can safely drop the i_data_sem here.
172 BUG_ON(EXT4_JOURNAL(inode
) == NULL
);
173 jbd_debug(2, "restarting handle %p\n", handle
);
174 up_write(&EXT4_I(inode
)->i_data_sem
);
175 ret
= ext4_journal_restart(handle
, nblocks
);
176 down_write(&EXT4_I(inode
)->i_data_sem
);
177 ext4_discard_preallocations(inode
);
183 * Called at the last iput() if i_nlink is zero.
185 void ext4_evict_inode(struct inode
*inode
)
189 int extra_credits
= 3;
190 struct ext4_xattr_inode_array
*ea_inode_array
= NULL
;
192 trace_ext4_evict_inode(inode
);
194 if (inode
->i_nlink
) {
196 * When journalling data dirty buffers are tracked only in the
197 * journal. So although mm thinks everything is clean and
198 * ready for reaping the inode might still have some pages to
199 * write in the running transaction or waiting to be
200 * checkpointed. Thus calling jbd2_journal_invalidatepage()
201 * (via truncate_inode_pages()) to discard these buffers can
202 * cause data loss. Also even if we did not discard these
203 * buffers, we would have no way to find them after the inode
204 * is reaped and thus user could see stale data if he tries to
205 * read them before the transaction is checkpointed. So be
206 * careful and force everything to disk here... We use
207 * ei->i_datasync_tid to store the newest transaction
208 * containing inode's data.
210 * Note that directories do not have this problem because they
211 * don't use page cache.
213 if (inode
->i_ino
!= EXT4_JOURNAL_INO
&&
214 ext4_should_journal_data(inode
) &&
215 (S_ISLNK(inode
->i_mode
) || S_ISREG(inode
->i_mode
)) &&
216 inode
->i_data
.nrpages
) {
217 journal_t
*journal
= EXT4_SB(inode
->i_sb
)->s_journal
;
218 tid_t commit_tid
= EXT4_I(inode
)->i_datasync_tid
;
220 jbd2_complete_transaction(journal
, commit_tid
);
221 filemap_write_and_wait(&inode
->i_data
);
223 truncate_inode_pages_final(&inode
->i_data
);
228 if (is_bad_inode(inode
))
230 dquot_initialize(inode
);
232 if (ext4_should_order_data(inode
))
233 ext4_begin_ordered_truncate(inode
, 0);
234 truncate_inode_pages_final(&inode
->i_data
);
237 * Protect us against freezing - iput() caller didn't have to have any
238 * protection against it
240 sb_start_intwrite(inode
->i_sb
);
242 if (!IS_NOQUOTA(inode
))
243 extra_credits
+= EXT4_MAXQUOTAS_DEL_BLOCKS(inode
->i_sb
);
245 handle
= ext4_journal_start(inode
, EXT4_HT_TRUNCATE
,
246 ext4_blocks_for_truncate(inode
)+extra_credits
);
247 if (IS_ERR(handle
)) {
248 ext4_std_error(inode
->i_sb
, PTR_ERR(handle
));
250 * If we're going to skip the normal cleanup, we still need to
251 * make sure that the in-core orphan linked list is properly
254 ext4_orphan_del(NULL
, inode
);
255 sb_end_intwrite(inode
->i_sb
);
260 ext4_handle_sync(handle
);
263 * Set inode->i_size to 0 before calling ext4_truncate(). We need
264 * special handling of symlinks here because i_size is used to
265 * determine whether ext4_inode_info->i_data contains symlink data or
266 * block mappings. Setting i_size to 0 will remove its fast symlink
267 * status. Erase i_data so that it becomes a valid empty block map.
269 if (ext4_inode_is_fast_symlink(inode
))
270 memset(EXT4_I(inode
)->i_data
, 0, sizeof(EXT4_I(inode
)->i_data
));
272 err
= ext4_mark_inode_dirty(handle
, inode
);
274 ext4_warning(inode
->i_sb
,
275 "couldn't mark inode dirty (err %d)", err
);
278 if (inode
->i_blocks
) {
279 err
= ext4_truncate(inode
);
281 ext4_error(inode
->i_sb
,
282 "couldn't truncate inode %lu (err %d)",
288 /* Remove xattr references. */
289 err
= ext4_xattr_delete_inode(handle
, inode
, &ea_inode_array
,
292 ext4_warning(inode
->i_sb
, "xattr delete (err %d)", err
);
294 ext4_journal_stop(handle
);
295 ext4_orphan_del(NULL
, inode
);
296 sb_end_intwrite(inode
->i_sb
);
297 ext4_xattr_inode_array_free(ea_inode_array
);
302 * Kill off the orphan record which ext4_truncate created.
303 * AKPM: I think this can be inside the above `if'.
304 * Note that ext4_orphan_del() has to be able to cope with the
305 * deletion of a non-existent orphan - this is because we don't
306 * know if ext4_truncate() actually created an orphan record.
307 * (Well, we could do this if we need to, but heck - it works)
309 ext4_orphan_del(handle
, inode
);
310 EXT4_I(inode
)->i_dtime
= get_seconds();
313 * One subtle ordering requirement: if anything has gone wrong
314 * (transaction abort, IO errors, whatever), then we can still
315 * do these next steps (the fs will already have been marked as
316 * having errors), but we can't free the inode if the mark_dirty
319 if (ext4_mark_inode_dirty(handle
, inode
))
320 /* If that failed, just do the required in-core inode clear. */
321 ext4_clear_inode(inode
);
323 ext4_free_inode(handle
, inode
);
324 ext4_journal_stop(handle
);
325 sb_end_intwrite(inode
->i_sb
);
326 ext4_xattr_inode_array_free(ea_inode_array
);
329 ext4_clear_inode(inode
); /* We must guarantee clearing of inode... */
333 qsize_t
*ext4_get_reserved_space(struct inode
*inode
)
335 return &EXT4_I(inode
)->i_reserved_quota
;
340 * Called with i_data_sem down, which is important since we can call
341 * ext4_discard_preallocations() from here.
343 void ext4_da_update_reserve_space(struct inode
*inode
,
344 int used
, int quota_claim
)
346 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
347 struct ext4_inode_info
*ei
= EXT4_I(inode
);
349 spin_lock(&ei
->i_block_reservation_lock
);
350 trace_ext4_da_update_reserve_space(inode
, used
, quota_claim
);
351 if (unlikely(used
> ei
->i_reserved_data_blocks
)) {
352 ext4_warning(inode
->i_sb
, "%s: ino %lu, used %d "
353 "with only %d reserved data blocks",
354 __func__
, inode
->i_ino
, used
,
355 ei
->i_reserved_data_blocks
);
357 used
= ei
->i_reserved_data_blocks
;
360 /* Update per-inode reservations */
361 ei
->i_reserved_data_blocks
-= used
;
362 percpu_counter_sub(&sbi
->s_dirtyclusters_counter
, used
);
364 spin_unlock(&EXT4_I(inode
)->i_block_reservation_lock
);
366 /* Update quota subsystem for data blocks */
368 dquot_claim_block(inode
, EXT4_C2B(sbi
, used
));
371 * We did fallocate with an offset that is already delayed
372 * allocated. So on delayed allocated writeback we should
373 * not re-claim the quota for fallocated blocks.
375 dquot_release_reservation_block(inode
, EXT4_C2B(sbi
, used
));
379 * If we have done all the pending block allocations and if
380 * there aren't any writers on the inode, we can discard the
381 * inode's preallocations.
383 if ((ei
->i_reserved_data_blocks
== 0) &&
384 (atomic_read(&inode
->i_writecount
) == 0))
385 ext4_discard_preallocations(inode
);
388 static int __check_block_validity(struct inode
*inode
, const char *func
,
390 struct ext4_map_blocks
*map
)
392 if (!ext4_data_block_valid(EXT4_SB(inode
->i_sb
), map
->m_pblk
,
394 ext4_error_inode(inode
, func
, line
, map
->m_pblk
,
395 "lblock %lu mapped to illegal pblock "
396 "(length %d)", (unsigned long) map
->m_lblk
,
398 return -EFSCORRUPTED
;
403 int ext4_issue_zeroout(struct inode
*inode
, ext4_lblk_t lblk
, ext4_fsblk_t pblk
,
408 if (ext4_encrypted_inode(inode
))
409 return fscrypt_zeroout_range(inode
, lblk
, pblk
, len
);
411 ret
= sb_issue_zeroout(inode
->i_sb
, pblk
, len
, GFP_NOFS
);
418 #define check_block_validity(inode, map) \
419 __check_block_validity((inode), __func__, __LINE__, (map))
421 #ifdef ES_AGGRESSIVE_TEST
422 static void ext4_map_blocks_es_recheck(handle_t
*handle
,
424 struct ext4_map_blocks
*es_map
,
425 struct ext4_map_blocks
*map
,
432 * There is a race window that the result is not the same.
433 * e.g. xfstests #223 when dioread_nolock enables. The reason
434 * is that we lookup a block mapping in extent status tree with
435 * out taking i_data_sem. So at the time the unwritten extent
436 * could be converted.
438 down_read(&EXT4_I(inode
)->i_data_sem
);
439 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)) {
440 retval
= ext4_ext_map_blocks(handle
, inode
, map
, flags
&
441 EXT4_GET_BLOCKS_KEEP_SIZE
);
443 retval
= ext4_ind_map_blocks(handle
, inode
, map
, flags
&
444 EXT4_GET_BLOCKS_KEEP_SIZE
);
446 up_read((&EXT4_I(inode
)->i_data_sem
));
449 * We don't check m_len because extent will be collpased in status
450 * tree. So the m_len might not equal.
452 if (es_map
->m_lblk
!= map
->m_lblk
||
453 es_map
->m_flags
!= map
->m_flags
||
454 es_map
->m_pblk
!= map
->m_pblk
) {
455 printk("ES cache assertion failed for inode: %lu "
456 "es_cached ex [%d/%d/%llu/%x] != "
457 "found ex [%d/%d/%llu/%x] retval %d flags %x\n",
458 inode
->i_ino
, es_map
->m_lblk
, es_map
->m_len
,
459 es_map
->m_pblk
, es_map
->m_flags
, map
->m_lblk
,
460 map
->m_len
, map
->m_pblk
, map
->m_flags
,
464 #endif /* ES_AGGRESSIVE_TEST */
467 * The ext4_map_blocks() function tries to look up the requested blocks,
468 * and returns if the blocks are already mapped.
470 * Otherwise it takes the write lock of the i_data_sem and allocate blocks
471 * and store the allocated blocks in the result buffer head and mark it
474 * If file type is extents based, it will call ext4_ext_map_blocks(),
475 * Otherwise, call with ext4_ind_map_blocks() to handle indirect mapping
478 * On success, it returns the number of blocks being mapped or allocated. if
479 * create==0 and the blocks are pre-allocated and unwritten, the resulting @map
480 * is marked as unwritten. If the create == 1, it will mark @map as mapped.
482 * It returns 0 if plain look up failed (blocks have not been allocated), in
483 * that case, @map is returned as unmapped but we still do fill map->m_len to
484 * indicate the length of a hole starting at map->m_lblk.
486 * It returns the error in case of allocation failure.
488 int ext4_map_blocks(handle_t
*handle
, struct inode
*inode
,
489 struct ext4_map_blocks
*map
, int flags
)
491 struct extent_status es
;
494 #ifdef ES_AGGRESSIVE_TEST
495 struct ext4_map_blocks orig_map
;
497 memcpy(&orig_map
, map
, sizeof(*map
));
501 ext_debug("ext4_map_blocks(): inode %lu, flag %d, max_blocks %u,"
502 "logical block %lu\n", inode
->i_ino
, flags
, map
->m_len
,
503 (unsigned long) map
->m_lblk
);
506 * ext4_map_blocks returns an int, and m_len is an unsigned int
508 if (unlikely(map
->m_len
> INT_MAX
))
509 map
->m_len
= INT_MAX
;
511 /* We can handle the block number less than EXT_MAX_BLOCKS */
512 if (unlikely(map
->m_lblk
>= EXT_MAX_BLOCKS
))
513 return -EFSCORRUPTED
;
515 /* Lookup extent status tree firstly */
516 if (ext4_es_lookup_extent(inode
, map
->m_lblk
, &es
)) {
517 if (ext4_es_is_written(&es
) || ext4_es_is_unwritten(&es
)) {
518 map
->m_pblk
= ext4_es_pblock(&es
) +
519 map
->m_lblk
- es
.es_lblk
;
520 map
->m_flags
|= ext4_es_is_written(&es
) ?
521 EXT4_MAP_MAPPED
: EXT4_MAP_UNWRITTEN
;
522 retval
= es
.es_len
- (map
->m_lblk
- es
.es_lblk
);
523 if (retval
> map
->m_len
)
526 } else if (ext4_es_is_delayed(&es
) || ext4_es_is_hole(&es
)) {
528 retval
= es
.es_len
- (map
->m_lblk
- es
.es_lblk
);
529 if (retval
> map
->m_len
)
536 #ifdef ES_AGGRESSIVE_TEST
537 ext4_map_blocks_es_recheck(handle
, inode
, map
,
544 * Try to see if we can get the block without requesting a new
547 down_read(&EXT4_I(inode
)->i_data_sem
);
548 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)) {
549 retval
= ext4_ext_map_blocks(handle
, inode
, map
, flags
&
550 EXT4_GET_BLOCKS_KEEP_SIZE
);
552 retval
= ext4_ind_map_blocks(handle
, inode
, map
, flags
&
553 EXT4_GET_BLOCKS_KEEP_SIZE
);
558 if (unlikely(retval
!= map
->m_len
)) {
559 ext4_warning(inode
->i_sb
,
560 "ES len assertion failed for inode "
561 "%lu: retval %d != map->m_len %d",
562 inode
->i_ino
, retval
, map
->m_len
);
566 status
= map
->m_flags
& EXT4_MAP_UNWRITTEN
?
567 EXTENT_STATUS_UNWRITTEN
: EXTENT_STATUS_WRITTEN
;
568 if (!(flags
& EXT4_GET_BLOCKS_DELALLOC_RESERVE
) &&
569 !(status
& EXTENT_STATUS_WRITTEN
) &&
570 ext4_find_delalloc_range(inode
, map
->m_lblk
,
571 map
->m_lblk
+ map
->m_len
- 1))
572 status
|= EXTENT_STATUS_DELAYED
;
573 ret
= ext4_es_insert_extent(inode
, map
->m_lblk
,
574 map
->m_len
, map
->m_pblk
, status
);
578 up_read((&EXT4_I(inode
)->i_data_sem
));
581 if (retval
> 0 && map
->m_flags
& EXT4_MAP_MAPPED
) {
582 ret
= check_block_validity(inode
, map
);
587 /* If it is only a block(s) look up */
588 if ((flags
& EXT4_GET_BLOCKS_CREATE
) == 0)
592 * Returns if the blocks have already allocated
594 * Note that if blocks have been preallocated
595 * ext4_ext_get_block() returns the create = 0
596 * with buffer head unmapped.
598 if (retval
> 0 && map
->m_flags
& EXT4_MAP_MAPPED
)
600 * If we need to convert extent to unwritten
601 * we continue and do the actual work in
602 * ext4_ext_map_blocks()
604 if (!(flags
& EXT4_GET_BLOCKS_CONVERT_UNWRITTEN
))
608 * Here we clear m_flags because after allocating an new extent,
609 * it will be set again.
611 map
->m_flags
&= ~EXT4_MAP_FLAGS
;
614 * New blocks allocate and/or writing to unwritten extent
615 * will possibly result in updating i_data, so we take
616 * the write lock of i_data_sem, and call get_block()
617 * with create == 1 flag.
619 down_write(&EXT4_I(inode
)->i_data_sem
);
622 * We need to check for EXT4 here because migrate
623 * could have changed the inode type in between
625 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)) {
626 retval
= ext4_ext_map_blocks(handle
, inode
, map
, flags
);
628 retval
= ext4_ind_map_blocks(handle
, inode
, map
, flags
);
630 if (retval
> 0 && map
->m_flags
& EXT4_MAP_NEW
) {
632 * We allocated new blocks which will result in
633 * i_data's format changing. Force the migrate
634 * to fail by clearing migrate flags
636 ext4_clear_inode_state(inode
, EXT4_STATE_EXT_MIGRATE
);
640 * Update reserved blocks/metadata blocks after successful
641 * block allocation which had been deferred till now. We don't
642 * support fallocate for non extent files. So we can update
643 * reserve space here.
646 (flags
& EXT4_GET_BLOCKS_DELALLOC_RESERVE
))
647 ext4_da_update_reserve_space(inode
, retval
, 1);
653 if (unlikely(retval
!= map
->m_len
)) {
654 ext4_warning(inode
->i_sb
,
655 "ES len assertion failed for inode "
656 "%lu: retval %d != map->m_len %d",
657 inode
->i_ino
, retval
, map
->m_len
);
662 * We have to zeroout blocks before inserting them into extent
663 * status tree. Otherwise someone could look them up there and
664 * use them before they are really zeroed. We also have to
665 * unmap metadata before zeroing as otherwise writeback can
666 * overwrite zeros with stale data from block device.
668 if (flags
& EXT4_GET_BLOCKS_ZERO
&&
669 map
->m_flags
& EXT4_MAP_MAPPED
&&
670 map
->m_flags
& EXT4_MAP_NEW
) {
671 clean_bdev_aliases(inode
->i_sb
->s_bdev
, map
->m_pblk
,
673 ret
= ext4_issue_zeroout(inode
, map
->m_lblk
,
674 map
->m_pblk
, map
->m_len
);
682 * If the extent has been zeroed out, we don't need to update
683 * extent status tree.
685 if ((flags
& EXT4_GET_BLOCKS_PRE_IO
) &&
686 ext4_es_lookup_extent(inode
, map
->m_lblk
, &es
)) {
687 if (ext4_es_is_written(&es
))
690 status
= map
->m_flags
& EXT4_MAP_UNWRITTEN
?
691 EXTENT_STATUS_UNWRITTEN
: EXTENT_STATUS_WRITTEN
;
692 if (!(flags
& EXT4_GET_BLOCKS_DELALLOC_RESERVE
) &&
693 !(status
& EXTENT_STATUS_WRITTEN
) &&
694 ext4_find_delalloc_range(inode
, map
->m_lblk
,
695 map
->m_lblk
+ map
->m_len
- 1))
696 status
|= EXTENT_STATUS_DELAYED
;
697 ret
= ext4_es_insert_extent(inode
, map
->m_lblk
, map
->m_len
,
698 map
->m_pblk
, status
);
706 up_write((&EXT4_I(inode
)->i_data_sem
));
707 if (retval
> 0 && map
->m_flags
& EXT4_MAP_MAPPED
) {
708 ret
= check_block_validity(inode
, map
);
713 * Inodes with freshly allocated blocks where contents will be
714 * visible after transaction commit must be on transaction's
717 if (map
->m_flags
& EXT4_MAP_NEW
&&
718 !(map
->m_flags
& EXT4_MAP_UNWRITTEN
) &&
719 !(flags
& EXT4_GET_BLOCKS_ZERO
) &&
720 !ext4_is_quota_file(inode
) &&
721 ext4_should_order_data(inode
)) {
722 if (flags
& EXT4_GET_BLOCKS_IO_SUBMIT
)
723 ret
= ext4_jbd2_inode_add_wait(handle
, inode
);
725 ret
= ext4_jbd2_inode_add_write(handle
, inode
);
734 * Update EXT4_MAP_FLAGS in bh->b_state. For buffer heads attached to pages
735 * we have to be careful as someone else may be manipulating b_state as well.
737 static void ext4_update_bh_state(struct buffer_head
*bh
, unsigned long flags
)
739 unsigned long old_state
;
740 unsigned long new_state
;
742 flags
&= EXT4_MAP_FLAGS
;
744 /* Dummy buffer_head? Set non-atomically. */
746 bh
->b_state
= (bh
->b_state
& ~EXT4_MAP_FLAGS
) | flags
;
750 * Someone else may be modifying b_state. Be careful! This is ugly but
751 * once we get rid of using bh as a container for mapping information
752 * to pass to / from get_block functions, this can go away.
755 old_state
= READ_ONCE(bh
->b_state
);
756 new_state
= (old_state
& ~EXT4_MAP_FLAGS
) | flags
;
758 cmpxchg(&bh
->b_state
, old_state
, new_state
) != old_state
));
761 static int _ext4_get_block(struct inode
*inode
, sector_t iblock
,
762 struct buffer_head
*bh
, int flags
)
764 struct ext4_map_blocks map
;
767 if (ext4_has_inline_data(inode
))
771 map
.m_len
= bh
->b_size
>> inode
->i_blkbits
;
773 ret
= ext4_map_blocks(ext4_journal_current_handle(), inode
, &map
,
776 map_bh(bh
, inode
->i_sb
, map
.m_pblk
);
777 ext4_update_bh_state(bh
, map
.m_flags
);
778 bh
->b_size
= inode
->i_sb
->s_blocksize
* map
.m_len
;
780 } else if (ret
== 0) {
781 /* hole case, need to fill in bh->b_size */
782 bh
->b_size
= inode
->i_sb
->s_blocksize
* map
.m_len
;
787 int ext4_get_block(struct inode
*inode
, sector_t iblock
,
788 struct buffer_head
*bh
, int create
)
790 return _ext4_get_block(inode
, iblock
, bh
,
791 create
? EXT4_GET_BLOCKS_CREATE
: 0);
795 * Get block function used when preparing for buffered write if we require
796 * creating an unwritten extent if blocks haven't been allocated. The extent
797 * will be converted to written after the IO is complete.
799 int ext4_get_block_unwritten(struct inode
*inode
, sector_t iblock
,
800 struct buffer_head
*bh_result
, int create
)
802 ext4_debug("ext4_get_block_unwritten: inode %lu, create flag %d\n",
803 inode
->i_ino
, create
);
804 return _ext4_get_block(inode
, iblock
, bh_result
,
805 EXT4_GET_BLOCKS_IO_CREATE_EXT
);
808 /* Maximum number of blocks we map for direct IO at once. */
809 #define DIO_MAX_BLOCKS 4096
812 * Get blocks function for the cases that need to start a transaction -
813 * generally difference cases of direct IO and DAX IO. It also handles retries
816 static int ext4_get_block_trans(struct inode
*inode
, sector_t iblock
,
817 struct buffer_head
*bh_result
, int flags
)
824 /* Trim mapping request to maximum we can map at once for DIO */
825 if (bh_result
->b_size
>> inode
->i_blkbits
> DIO_MAX_BLOCKS
)
826 bh_result
->b_size
= DIO_MAX_BLOCKS
<< inode
->i_blkbits
;
827 dio_credits
= ext4_chunk_trans_blocks(inode
,
828 bh_result
->b_size
>> inode
->i_blkbits
);
830 handle
= ext4_journal_start(inode
, EXT4_HT_MAP_BLOCKS
, dio_credits
);
832 return PTR_ERR(handle
);
834 ret
= _ext4_get_block(inode
, iblock
, bh_result
, flags
);
835 ext4_journal_stop(handle
);
837 if (ret
== -ENOSPC
&& ext4_should_retry_alloc(inode
->i_sb
, &retries
))
842 /* Get block function for DIO reads and writes to inodes without extents */
843 int ext4_dio_get_block(struct inode
*inode
, sector_t iblock
,
844 struct buffer_head
*bh
, int create
)
846 /* We don't expect handle for direct IO */
847 WARN_ON_ONCE(ext4_journal_current_handle());
850 return _ext4_get_block(inode
, iblock
, bh
, 0);
851 return ext4_get_block_trans(inode
, iblock
, bh
, EXT4_GET_BLOCKS_CREATE
);
855 * Get block function for AIO DIO writes when we create unwritten extent if
856 * blocks are not allocated yet. The extent will be converted to written
857 * after IO is complete.
859 static int ext4_dio_get_block_unwritten_async(struct inode
*inode
,
860 sector_t iblock
, struct buffer_head
*bh_result
, int create
)
864 /* We don't expect handle for direct IO */
865 WARN_ON_ONCE(ext4_journal_current_handle());
867 ret
= ext4_get_block_trans(inode
, iblock
, bh_result
,
868 EXT4_GET_BLOCKS_IO_CREATE_EXT
);
871 * When doing DIO using unwritten extents, we need io_end to convert
872 * unwritten extents to written on IO completion. We allocate io_end
873 * once we spot unwritten extent and store it in b_private. Generic
874 * DIO code keeps b_private set and furthermore passes the value to
875 * our completion callback in 'private' argument.
877 if (!ret
&& buffer_unwritten(bh_result
)) {
878 if (!bh_result
->b_private
) {
879 ext4_io_end_t
*io_end
;
881 io_end
= ext4_init_io_end(inode
, GFP_KERNEL
);
884 bh_result
->b_private
= io_end
;
885 ext4_set_io_unwritten_flag(inode
, io_end
);
887 set_buffer_defer_completion(bh_result
);
894 * Get block function for non-AIO DIO writes when we create unwritten extent if
895 * blocks are not allocated yet. The extent will be converted to written
896 * after IO is complete by ext4_direct_IO_write().
898 static int ext4_dio_get_block_unwritten_sync(struct inode
*inode
,
899 sector_t iblock
, struct buffer_head
*bh_result
, int create
)
903 /* We don't expect handle for direct IO */
904 WARN_ON_ONCE(ext4_journal_current_handle());
906 ret
= ext4_get_block_trans(inode
, iblock
, bh_result
,
907 EXT4_GET_BLOCKS_IO_CREATE_EXT
);
910 * Mark inode as having pending DIO writes to unwritten extents.
911 * ext4_direct_IO_write() checks this flag and converts extents to
914 if (!ret
&& buffer_unwritten(bh_result
))
915 ext4_set_inode_state(inode
, EXT4_STATE_DIO_UNWRITTEN
);
920 static int ext4_dio_get_block_overwrite(struct inode
*inode
, sector_t iblock
,
921 struct buffer_head
*bh_result
, int create
)
925 ext4_debug("ext4_dio_get_block_overwrite: inode %lu, create flag %d\n",
926 inode
->i_ino
, create
);
927 /* We don't expect handle for direct IO */
928 WARN_ON_ONCE(ext4_journal_current_handle());
930 ret
= _ext4_get_block(inode
, iblock
, bh_result
, 0);
932 * Blocks should have been preallocated! ext4_file_write_iter() checks
935 WARN_ON_ONCE(!buffer_mapped(bh_result
) || buffer_unwritten(bh_result
));
942 * `handle' can be NULL if create is zero
944 struct buffer_head
*ext4_getblk(handle_t
*handle
, struct inode
*inode
,
945 ext4_lblk_t block
, int map_flags
)
947 struct ext4_map_blocks map
;
948 struct buffer_head
*bh
;
949 int create
= map_flags
& EXT4_GET_BLOCKS_CREATE
;
952 J_ASSERT(handle
!= NULL
|| create
== 0);
956 err
= ext4_map_blocks(handle
, inode
, &map
, map_flags
);
959 return create
? ERR_PTR(-ENOSPC
) : NULL
;
963 bh
= sb_getblk(inode
->i_sb
, map
.m_pblk
);
965 return ERR_PTR(-ENOMEM
);
966 if (map
.m_flags
& EXT4_MAP_NEW
) {
967 J_ASSERT(create
!= 0);
968 J_ASSERT(handle
!= NULL
);
971 * Now that we do not always journal data, we should
972 * keep in mind whether this should always journal the
973 * new buffer as metadata. For now, regular file
974 * writes use ext4_get_block instead, so it's not a
978 BUFFER_TRACE(bh
, "call get_create_access");
979 err
= ext4_journal_get_create_access(handle
, bh
);
984 if (!buffer_uptodate(bh
)) {
985 memset(bh
->b_data
, 0, inode
->i_sb
->s_blocksize
);
986 set_buffer_uptodate(bh
);
989 BUFFER_TRACE(bh
, "call ext4_handle_dirty_metadata");
990 err
= ext4_handle_dirty_metadata(handle
, inode
, bh
);
994 BUFFER_TRACE(bh
, "not a new buffer");
1001 struct buffer_head
*ext4_bread(handle_t
*handle
, struct inode
*inode
,
1002 ext4_lblk_t block
, int map_flags
)
1004 struct buffer_head
*bh
;
1006 bh
= ext4_getblk(handle
, inode
, block
, map_flags
);
1009 if (!bh
|| buffer_uptodate(bh
))
1011 ll_rw_block(REQ_OP_READ
, REQ_META
| REQ_PRIO
, 1, &bh
);
1013 if (buffer_uptodate(bh
))
1016 return ERR_PTR(-EIO
);
1019 /* Read a contiguous batch of blocks. */
1020 int ext4_bread_batch(struct inode
*inode
, ext4_lblk_t block
, int bh_count
,
1021 bool wait
, struct buffer_head
**bhs
)
1025 for (i
= 0; i
< bh_count
; i
++) {
1026 bhs
[i
] = ext4_getblk(NULL
, inode
, block
+ i
, 0 /* map_flags */);
1027 if (IS_ERR(bhs
[i
])) {
1028 err
= PTR_ERR(bhs
[i
]);
1034 for (i
= 0; i
< bh_count
; i
++)
1035 /* Note that NULL bhs[i] is valid because of holes. */
1036 if (bhs
[i
] && !buffer_uptodate(bhs
[i
]))
1037 ll_rw_block(REQ_OP_READ
, REQ_META
| REQ_PRIO
, 1,
1043 for (i
= 0; i
< bh_count
; i
++)
1045 wait_on_buffer(bhs
[i
]);
1047 for (i
= 0; i
< bh_count
; i
++) {
1048 if (bhs
[i
] && !buffer_uptodate(bhs
[i
])) {
1056 for (i
= 0; i
< bh_count
; i
++) {
1063 int ext4_walk_page_buffers(handle_t
*handle
,
1064 struct buffer_head
*head
,
1068 int (*fn
)(handle_t
*handle
,
1069 struct buffer_head
*bh
))
1071 struct buffer_head
*bh
;
1072 unsigned block_start
, block_end
;
1073 unsigned blocksize
= head
->b_size
;
1075 struct buffer_head
*next
;
1077 for (bh
= head
, block_start
= 0;
1078 ret
== 0 && (bh
!= head
|| !block_start
);
1079 block_start
= block_end
, bh
= next
) {
1080 next
= bh
->b_this_page
;
1081 block_end
= block_start
+ blocksize
;
1082 if (block_end
<= from
|| block_start
>= to
) {
1083 if (partial
&& !buffer_uptodate(bh
))
1087 err
= (*fn
)(handle
, bh
);
1095 * To preserve ordering, it is essential that the hole instantiation and
1096 * the data write be encapsulated in a single transaction. We cannot
1097 * close off a transaction and start a new one between the ext4_get_block()
1098 * and the commit_write(). So doing the jbd2_journal_start at the start of
1099 * prepare_write() is the right place.
1101 * Also, this function can nest inside ext4_writepage(). In that case, we
1102 * *know* that ext4_writepage() has generated enough buffer credits to do the
1103 * whole page. So we won't block on the journal in that case, which is good,
1104 * because the caller may be PF_MEMALLOC.
1106 * By accident, ext4 can be reentered when a transaction is open via
1107 * quota file writes. If we were to commit the transaction while thus
1108 * reentered, there can be a deadlock - we would be holding a quota
1109 * lock, and the commit would never complete if another thread had a
1110 * transaction open and was blocking on the quota lock - a ranking
1113 * So what we do is to rely on the fact that jbd2_journal_stop/journal_start
1114 * will _not_ run commit under these circumstances because handle->h_ref
1115 * is elevated. We'll still have enough credits for the tiny quotafile
1118 int do_journal_get_write_access(handle_t
*handle
,
1119 struct buffer_head
*bh
)
1121 int dirty
= buffer_dirty(bh
);
1124 if (!buffer_mapped(bh
) || buffer_freed(bh
))
1127 * __block_write_begin() could have dirtied some buffers. Clean
1128 * the dirty bit as jbd2_journal_get_write_access() could complain
1129 * otherwise about fs integrity issues. Setting of the dirty bit
1130 * by __block_write_begin() isn't a real problem here as we clear
1131 * the bit before releasing a page lock and thus writeback cannot
1132 * ever write the buffer.
1135 clear_buffer_dirty(bh
);
1136 BUFFER_TRACE(bh
, "get write access");
1137 ret
= ext4_journal_get_write_access(handle
, bh
);
1139 ret
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
1143 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1144 static int ext4_block_write_begin(struct page
*page
, loff_t pos
, unsigned len
,
1145 get_block_t
*get_block
)
1147 unsigned from
= pos
& (PAGE_SIZE
- 1);
1148 unsigned to
= from
+ len
;
1149 struct inode
*inode
= page
->mapping
->host
;
1150 unsigned block_start
, block_end
;
1153 unsigned blocksize
= inode
->i_sb
->s_blocksize
;
1155 struct buffer_head
*bh
, *head
, *wait
[2], **wait_bh
= wait
;
1156 bool decrypt
= false;
1158 BUG_ON(!PageLocked(page
));
1159 BUG_ON(from
> PAGE_SIZE
);
1160 BUG_ON(to
> PAGE_SIZE
);
1163 if (!page_has_buffers(page
))
1164 create_empty_buffers(page
, blocksize
, 0);
1165 head
= page_buffers(page
);
1166 bbits
= ilog2(blocksize
);
1167 block
= (sector_t
)page
->index
<< (PAGE_SHIFT
- bbits
);
1169 for (bh
= head
, block_start
= 0; bh
!= head
|| !block_start
;
1170 block
++, block_start
= block_end
, bh
= bh
->b_this_page
) {
1171 block_end
= block_start
+ blocksize
;
1172 if (block_end
<= from
|| block_start
>= to
) {
1173 if (PageUptodate(page
)) {
1174 if (!buffer_uptodate(bh
))
1175 set_buffer_uptodate(bh
);
1180 clear_buffer_new(bh
);
1181 if (!buffer_mapped(bh
)) {
1182 WARN_ON(bh
->b_size
!= blocksize
);
1183 err
= get_block(inode
, block
, bh
, 1);
1186 if (buffer_new(bh
)) {
1187 clean_bdev_bh_alias(bh
);
1188 if (PageUptodate(page
)) {
1189 clear_buffer_new(bh
);
1190 set_buffer_uptodate(bh
);
1191 mark_buffer_dirty(bh
);
1194 if (block_end
> to
|| block_start
< from
)
1195 zero_user_segments(page
, to
, block_end
,
1200 if (PageUptodate(page
)) {
1201 if (!buffer_uptodate(bh
))
1202 set_buffer_uptodate(bh
);
1205 if (!buffer_uptodate(bh
) && !buffer_delay(bh
) &&
1206 !buffer_unwritten(bh
) &&
1207 (block_start
< from
|| block_end
> to
)) {
1208 ll_rw_block(REQ_OP_READ
, 0, 1, &bh
);
1210 decrypt
= ext4_encrypted_inode(inode
) &&
1211 S_ISREG(inode
->i_mode
);
1215 * If we issued read requests, let them complete.
1217 while (wait_bh
> wait
) {
1218 wait_on_buffer(*--wait_bh
);
1219 if (!buffer_uptodate(*wait_bh
))
1223 page_zero_new_buffers(page
, from
, to
);
1225 err
= fscrypt_decrypt_page(page
->mapping
->host
, page
,
1226 PAGE_SIZE
, 0, page
->index
);
1231 static int ext4_write_begin(struct file
*file
, struct address_space
*mapping
,
1232 loff_t pos
, unsigned len
, unsigned flags
,
1233 struct page
**pagep
, void **fsdata
)
1235 struct inode
*inode
= mapping
->host
;
1236 int ret
, needed_blocks
;
1243 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode
->i_sb
))))
1246 trace_ext4_write_begin(inode
, pos
, len
, flags
);
1248 * Reserve one block more for addition to orphan list in case
1249 * we allocate blocks but write fails for some reason
1251 needed_blocks
= ext4_writepage_trans_blocks(inode
) + 1;
1252 index
= pos
>> PAGE_SHIFT
;
1253 from
= pos
& (PAGE_SIZE
- 1);
1256 if (ext4_test_inode_state(inode
, EXT4_STATE_MAY_INLINE_DATA
)) {
1257 ret
= ext4_try_to_write_inline_data(mapping
, inode
, pos
, len
,
1266 * grab_cache_page_write_begin() can take a long time if the
1267 * system is thrashing due to memory pressure, or if the page
1268 * is being written back. So grab it first before we start
1269 * the transaction handle. This also allows us to allocate
1270 * the page (if needed) without using GFP_NOFS.
1273 page
= grab_cache_page_write_begin(mapping
, index
, flags
);
1279 handle
= ext4_journal_start(inode
, EXT4_HT_WRITE_PAGE
, needed_blocks
);
1280 if (IS_ERR(handle
)) {
1282 return PTR_ERR(handle
);
1286 if (page
->mapping
!= mapping
) {
1287 /* The page got truncated from under us */
1290 ext4_journal_stop(handle
);
1293 /* In case writeback began while the page was unlocked */
1294 wait_for_stable_page(page
);
1296 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1297 if (ext4_should_dioread_nolock(inode
))
1298 ret
= ext4_block_write_begin(page
, pos
, len
,
1299 ext4_get_block_unwritten
);
1301 ret
= ext4_block_write_begin(page
, pos
, len
,
1304 if (ext4_should_dioread_nolock(inode
))
1305 ret
= __block_write_begin(page
, pos
, len
,
1306 ext4_get_block_unwritten
);
1308 ret
= __block_write_begin(page
, pos
, len
, ext4_get_block
);
1310 if (!ret
&& ext4_should_journal_data(inode
)) {
1311 ret
= ext4_walk_page_buffers(handle
, page_buffers(page
),
1313 do_journal_get_write_access
);
1319 * __block_write_begin may have instantiated a few blocks
1320 * outside i_size. Trim these off again. Don't need
1321 * i_size_read because we hold i_mutex.
1323 * Add inode to orphan list in case we crash before
1326 if (pos
+ len
> inode
->i_size
&& ext4_can_truncate(inode
))
1327 ext4_orphan_add(handle
, inode
);
1329 ext4_journal_stop(handle
);
1330 if (pos
+ len
> inode
->i_size
) {
1331 ext4_truncate_failed_write(inode
);
1333 * If truncate failed early the inode might
1334 * still be on the orphan list; we need to
1335 * make sure the inode is removed from the
1336 * orphan list in that case.
1339 ext4_orphan_del(NULL
, inode
);
1342 if (ret
== -ENOSPC
&&
1343 ext4_should_retry_alloc(inode
->i_sb
, &retries
))
1352 /* For write_end() in data=journal mode */
1353 static int write_end_fn(handle_t
*handle
, struct buffer_head
*bh
)
1356 if (!buffer_mapped(bh
) || buffer_freed(bh
))
1358 set_buffer_uptodate(bh
);
1359 ret
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
1360 clear_buffer_meta(bh
);
1361 clear_buffer_prio(bh
);
1366 * We need to pick up the new inode size which generic_commit_write gave us
1367 * `file' can be NULL - eg, when called from page_symlink().
1369 * ext4 never places buffers on inode->i_mapping->private_list. metadata
1370 * buffers are managed internally.
1372 static int ext4_write_end(struct file
*file
,
1373 struct address_space
*mapping
,
1374 loff_t pos
, unsigned len
, unsigned copied
,
1375 struct page
*page
, void *fsdata
)
1377 handle_t
*handle
= ext4_journal_current_handle();
1378 struct inode
*inode
= mapping
->host
;
1379 loff_t old_size
= inode
->i_size
;
1381 int i_size_changed
= 0;
1383 trace_ext4_write_end(inode
, pos
, len
, copied
);
1384 if (ext4_has_inline_data(inode
)) {
1385 ret
= ext4_write_inline_data_end(inode
, pos
, len
,
1394 copied
= block_write_end(file
, mapping
, pos
,
1395 len
, copied
, page
, fsdata
);
1397 * it's important to update i_size while still holding page lock:
1398 * page writeout could otherwise come in and zero beyond i_size.
1400 i_size_changed
= ext4_update_inode_size(inode
, pos
+ copied
);
1405 pagecache_isize_extended(inode
, old_size
, pos
);
1407 * Don't mark the inode dirty under page lock. First, it unnecessarily
1408 * makes the holding time of page lock longer. Second, it forces lock
1409 * ordering of page lock and transaction start for journaling
1413 ext4_mark_inode_dirty(handle
, inode
);
1415 if (pos
+ len
> inode
->i_size
&& ext4_can_truncate(inode
))
1416 /* if we have allocated more blocks and copied
1417 * less. We will have blocks allocated outside
1418 * inode->i_size. So truncate them
1420 ext4_orphan_add(handle
, inode
);
1422 ret2
= ext4_journal_stop(handle
);
1426 if (pos
+ len
> inode
->i_size
) {
1427 ext4_truncate_failed_write(inode
);
1429 * If truncate failed early the inode might still be
1430 * on the orphan list; we need to make sure the inode
1431 * is removed from the orphan list in that case.
1434 ext4_orphan_del(NULL
, inode
);
1437 return ret
? ret
: copied
;
1441 * This is a private version of page_zero_new_buffers() which doesn't
1442 * set the buffer to be dirty, since in data=journalled mode we need
1443 * to call ext4_handle_dirty_metadata() instead.
1445 static void ext4_journalled_zero_new_buffers(handle_t
*handle
,
1447 unsigned from
, unsigned to
)
1449 unsigned int block_start
= 0, block_end
;
1450 struct buffer_head
*head
, *bh
;
1452 bh
= head
= page_buffers(page
);
1454 block_end
= block_start
+ bh
->b_size
;
1455 if (buffer_new(bh
)) {
1456 if (block_end
> from
&& block_start
< to
) {
1457 if (!PageUptodate(page
)) {
1458 unsigned start
, size
;
1460 start
= max(from
, block_start
);
1461 size
= min(to
, block_end
) - start
;
1463 zero_user(page
, start
, size
);
1464 write_end_fn(handle
, bh
);
1466 clear_buffer_new(bh
);
1469 block_start
= block_end
;
1470 bh
= bh
->b_this_page
;
1471 } while (bh
!= head
);
1474 static int ext4_journalled_write_end(struct file
*file
,
1475 struct address_space
*mapping
,
1476 loff_t pos
, unsigned len
, unsigned copied
,
1477 struct page
*page
, void *fsdata
)
1479 handle_t
*handle
= ext4_journal_current_handle();
1480 struct inode
*inode
= mapping
->host
;
1481 loff_t old_size
= inode
->i_size
;
1485 int size_changed
= 0;
1487 trace_ext4_journalled_write_end(inode
, pos
, len
, copied
);
1488 from
= pos
& (PAGE_SIZE
- 1);
1491 BUG_ON(!ext4_handle_valid(handle
));
1493 if (ext4_has_inline_data(inode
)) {
1494 ret
= ext4_write_inline_data_end(inode
, pos
, len
,
1502 } else if (unlikely(copied
< len
) && !PageUptodate(page
)) {
1504 ext4_journalled_zero_new_buffers(handle
, page
, from
, to
);
1506 if (unlikely(copied
< len
))
1507 ext4_journalled_zero_new_buffers(handle
, page
,
1509 ret
= ext4_walk_page_buffers(handle
, page_buffers(page
), from
,
1510 from
+ copied
, &partial
,
1513 SetPageUptodate(page
);
1515 size_changed
= ext4_update_inode_size(inode
, pos
+ copied
);
1516 ext4_set_inode_state(inode
, EXT4_STATE_JDATA
);
1517 EXT4_I(inode
)->i_datasync_tid
= handle
->h_transaction
->t_tid
;
1522 pagecache_isize_extended(inode
, old_size
, pos
);
1525 ret2
= ext4_mark_inode_dirty(handle
, inode
);
1530 if (pos
+ len
> inode
->i_size
&& ext4_can_truncate(inode
))
1531 /* if we have allocated more blocks and copied
1532 * less. We will have blocks allocated outside
1533 * inode->i_size. So truncate them
1535 ext4_orphan_add(handle
, inode
);
1538 ret2
= ext4_journal_stop(handle
);
1541 if (pos
+ len
> inode
->i_size
) {
1542 ext4_truncate_failed_write(inode
);
1544 * If truncate failed early the inode might still be
1545 * on the orphan list; we need to make sure the inode
1546 * is removed from the orphan list in that case.
1549 ext4_orphan_del(NULL
, inode
);
1552 return ret
? ret
: copied
;
1556 * Reserve space for a single cluster
1558 static int ext4_da_reserve_space(struct inode
*inode
)
1560 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
1561 struct ext4_inode_info
*ei
= EXT4_I(inode
);
1565 * We will charge metadata quota at writeout time; this saves
1566 * us from metadata over-estimation, though we may go over by
1567 * a small amount in the end. Here we just reserve for data.
1569 ret
= dquot_reserve_block(inode
, EXT4_C2B(sbi
, 1));
1573 spin_lock(&ei
->i_block_reservation_lock
);
1574 if (ext4_claim_free_clusters(sbi
, 1, 0)) {
1575 spin_unlock(&ei
->i_block_reservation_lock
);
1576 dquot_release_reservation_block(inode
, EXT4_C2B(sbi
, 1));
1579 ei
->i_reserved_data_blocks
++;
1580 trace_ext4_da_reserve_space(inode
);
1581 spin_unlock(&ei
->i_block_reservation_lock
);
1583 return 0; /* success */
1586 static void ext4_da_release_space(struct inode
*inode
, int to_free
)
1588 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
1589 struct ext4_inode_info
*ei
= EXT4_I(inode
);
1592 return; /* Nothing to release, exit */
1594 spin_lock(&EXT4_I(inode
)->i_block_reservation_lock
);
1596 trace_ext4_da_release_space(inode
, to_free
);
1597 if (unlikely(to_free
> ei
->i_reserved_data_blocks
)) {
1599 * if there aren't enough reserved blocks, then the
1600 * counter is messed up somewhere. Since this
1601 * function is called from invalidate page, it's
1602 * harmless to return without any action.
1604 ext4_warning(inode
->i_sb
, "ext4_da_release_space: "
1605 "ino %lu, to_free %d with only %d reserved "
1606 "data blocks", inode
->i_ino
, to_free
,
1607 ei
->i_reserved_data_blocks
);
1609 to_free
= ei
->i_reserved_data_blocks
;
1611 ei
->i_reserved_data_blocks
-= to_free
;
1613 /* update fs dirty data blocks counter */
1614 percpu_counter_sub(&sbi
->s_dirtyclusters_counter
, to_free
);
1616 spin_unlock(&EXT4_I(inode
)->i_block_reservation_lock
);
1618 dquot_release_reservation_block(inode
, EXT4_C2B(sbi
, to_free
));
1621 static void ext4_da_page_release_reservation(struct page
*page
,
1622 unsigned int offset
,
1623 unsigned int length
)
1625 int to_release
= 0, contiguous_blks
= 0;
1626 struct buffer_head
*head
, *bh
;
1627 unsigned int curr_off
= 0;
1628 struct inode
*inode
= page
->mapping
->host
;
1629 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
1630 unsigned int stop
= offset
+ length
;
1634 BUG_ON(stop
> PAGE_SIZE
|| stop
< length
);
1636 head
= page_buffers(page
);
1639 unsigned int next_off
= curr_off
+ bh
->b_size
;
1641 if (next_off
> stop
)
1644 if ((offset
<= curr_off
) && (buffer_delay(bh
))) {
1647 clear_buffer_delay(bh
);
1648 } else if (contiguous_blks
) {
1649 lblk
= page
->index
<<
1650 (PAGE_SHIFT
- inode
->i_blkbits
);
1651 lblk
+= (curr_off
>> inode
->i_blkbits
) -
1653 ext4_es_remove_extent(inode
, lblk
, contiguous_blks
);
1654 contiguous_blks
= 0;
1656 curr_off
= next_off
;
1657 } while ((bh
= bh
->b_this_page
) != head
);
1659 if (contiguous_blks
) {
1660 lblk
= page
->index
<< (PAGE_SHIFT
- inode
->i_blkbits
);
1661 lblk
+= (curr_off
>> inode
->i_blkbits
) - contiguous_blks
;
1662 ext4_es_remove_extent(inode
, lblk
, contiguous_blks
);
1665 /* If we have released all the blocks belonging to a cluster, then we
1666 * need to release the reserved space for that cluster. */
1667 num_clusters
= EXT4_NUM_B2C(sbi
, to_release
);
1668 while (num_clusters
> 0) {
1669 lblk
= (page
->index
<< (PAGE_SHIFT
- inode
->i_blkbits
)) +
1670 ((num_clusters
- 1) << sbi
->s_cluster_bits
);
1671 if (sbi
->s_cluster_ratio
== 1 ||
1672 !ext4_find_delalloc_cluster(inode
, lblk
))
1673 ext4_da_release_space(inode
, 1);
1680 * Delayed allocation stuff
1683 struct mpage_da_data
{
1684 struct inode
*inode
;
1685 struct writeback_control
*wbc
;
1687 pgoff_t first_page
; /* The first page to write */
1688 pgoff_t next_page
; /* Current page to examine */
1689 pgoff_t last_page
; /* Last page to examine */
1691 * Extent to map - this can be after first_page because that can be
1692 * fully mapped. We somewhat abuse m_flags to store whether the extent
1693 * is delalloc or unwritten.
1695 struct ext4_map_blocks map
;
1696 struct ext4_io_submit io_submit
; /* IO submission data */
1697 unsigned int do_map
:1;
1700 static void mpage_release_unused_pages(struct mpage_da_data
*mpd
,
1705 struct pagevec pvec
;
1706 struct inode
*inode
= mpd
->inode
;
1707 struct address_space
*mapping
= inode
->i_mapping
;
1709 /* This is necessary when next_page == 0. */
1710 if (mpd
->first_page
>= mpd
->next_page
)
1713 index
= mpd
->first_page
;
1714 end
= mpd
->next_page
- 1;
1716 ext4_lblk_t start
, last
;
1717 start
= index
<< (PAGE_SHIFT
- inode
->i_blkbits
);
1718 last
= end
<< (PAGE_SHIFT
- inode
->i_blkbits
);
1719 ext4_es_remove_extent(inode
, start
, last
- start
+ 1);
1722 pagevec_init(&pvec
, 0);
1723 while (index
<= end
) {
1724 nr_pages
= pagevec_lookup_range(&pvec
, mapping
, &index
, end
);
1727 for (i
= 0; i
< nr_pages
; i
++) {
1728 struct page
*page
= pvec
.pages
[i
];
1730 BUG_ON(!PageLocked(page
));
1731 BUG_ON(PageWriteback(page
));
1733 if (page_mapped(page
))
1734 clear_page_dirty_for_io(page
);
1735 block_invalidatepage(page
, 0, PAGE_SIZE
);
1736 ClearPageUptodate(page
);
1740 pagevec_release(&pvec
);
1744 static void ext4_print_free_blocks(struct inode
*inode
)
1746 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
1747 struct super_block
*sb
= inode
->i_sb
;
1748 struct ext4_inode_info
*ei
= EXT4_I(inode
);
1750 ext4_msg(sb
, KERN_CRIT
, "Total free blocks count %lld",
1751 EXT4_C2B(EXT4_SB(inode
->i_sb
),
1752 ext4_count_free_clusters(sb
)));
1753 ext4_msg(sb
, KERN_CRIT
, "Free/Dirty block details");
1754 ext4_msg(sb
, KERN_CRIT
, "free_blocks=%lld",
1755 (long long) EXT4_C2B(EXT4_SB(sb
),
1756 percpu_counter_sum(&sbi
->s_freeclusters_counter
)));
1757 ext4_msg(sb
, KERN_CRIT
, "dirty_blocks=%lld",
1758 (long long) EXT4_C2B(EXT4_SB(sb
),
1759 percpu_counter_sum(&sbi
->s_dirtyclusters_counter
)));
1760 ext4_msg(sb
, KERN_CRIT
, "Block reservation details");
1761 ext4_msg(sb
, KERN_CRIT
, "i_reserved_data_blocks=%u",
1762 ei
->i_reserved_data_blocks
);
1766 static int ext4_bh_delay_or_unwritten(handle_t
*handle
, struct buffer_head
*bh
)
1768 return (buffer_delay(bh
) || buffer_unwritten(bh
)) && buffer_dirty(bh
);
1772 * This function is grabs code from the very beginning of
1773 * ext4_map_blocks, but assumes that the caller is from delayed write
1774 * time. This function looks up the requested blocks and sets the
1775 * buffer delay bit under the protection of i_data_sem.
1777 static int ext4_da_map_blocks(struct inode
*inode
, sector_t iblock
,
1778 struct ext4_map_blocks
*map
,
1779 struct buffer_head
*bh
)
1781 struct extent_status es
;
1783 sector_t invalid_block
= ~((sector_t
) 0xffff);
1784 #ifdef ES_AGGRESSIVE_TEST
1785 struct ext4_map_blocks orig_map
;
1787 memcpy(&orig_map
, map
, sizeof(*map
));
1790 if (invalid_block
< ext4_blocks_count(EXT4_SB(inode
->i_sb
)->s_es
))
1794 ext_debug("ext4_da_map_blocks(): inode %lu, max_blocks %u,"
1795 "logical block %lu\n", inode
->i_ino
, map
->m_len
,
1796 (unsigned long) map
->m_lblk
);
1798 /* Lookup extent status tree firstly */
1799 if (ext4_es_lookup_extent(inode
, iblock
, &es
)) {
1800 if (ext4_es_is_hole(&es
)) {
1802 down_read(&EXT4_I(inode
)->i_data_sem
);
1807 * Delayed extent could be allocated by fallocate.
1808 * So we need to check it.
1810 if (ext4_es_is_delayed(&es
) && !ext4_es_is_unwritten(&es
)) {
1811 map_bh(bh
, inode
->i_sb
, invalid_block
);
1813 set_buffer_delay(bh
);
1817 map
->m_pblk
= ext4_es_pblock(&es
) + iblock
- es
.es_lblk
;
1818 retval
= es
.es_len
- (iblock
- es
.es_lblk
);
1819 if (retval
> map
->m_len
)
1820 retval
= map
->m_len
;
1821 map
->m_len
= retval
;
1822 if (ext4_es_is_written(&es
))
1823 map
->m_flags
|= EXT4_MAP_MAPPED
;
1824 else if (ext4_es_is_unwritten(&es
))
1825 map
->m_flags
|= EXT4_MAP_UNWRITTEN
;
1829 #ifdef ES_AGGRESSIVE_TEST
1830 ext4_map_blocks_es_recheck(NULL
, inode
, map
, &orig_map
, 0);
1836 * Try to see if we can get the block without requesting a new
1837 * file system block.
1839 down_read(&EXT4_I(inode
)->i_data_sem
);
1840 if (ext4_has_inline_data(inode
))
1842 else if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))
1843 retval
= ext4_ext_map_blocks(NULL
, inode
, map
, 0);
1845 retval
= ext4_ind_map_blocks(NULL
, inode
, map
, 0);
1851 * XXX: __block_prepare_write() unmaps passed block,
1855 * If the block was allocated from previously allocated cluster,
1856 * then we don't need to reserve it again. However we still need
1857 * to reserve metadata for every block we're going to write.
1859 if (EXT4_SB(inode
->i_sb
)->s_cluster_ratio
== 1 ||
1860 !ext4_find_delalloc_cluster(inode
, map
->m_lblk
)) {
1861 ret
= ext4_da_reserve_space(inode
);
1863 /* not enough space to reserve */
1869 ret
= ext4_es_insert_extent(inode
, map
->m_lblk
, map
->m_len
,
1870 ~0, EXTENT_STATUS_DELAYED
);
1876 map_bh(bh
, inode
->i_sb
, invalid_block
);
1878 set_buffer_delay(bh
);
1879 } else if (retval
> 0) {
1881 unsigned int status
;
1883 if (unlikely(retval
!= map
->m_len
)) {
1884 ext4_warning(inode
->i_sb
,
1885 "ES len assertion failed for inode "
1886 "%lu: retval %d != map->m_len %d",
1887 inode
->i_ino
, retval
, map
->m_len
);
1891 status
= map
->m_flags
& EXT4_MAP_UNWRITTEN
?
1892 EXTENT_STATUS_UNWRITTEN
: EXTENT_STATUS_WRITTEN
;
1893 ret
= ext4_es_insert_extent(inode
, map
->m_lblk
, map
->m_len
,
1894 map
->m_pblk
, status
);
1900 up_read((&EXT4_I(inode
)->i_data_sem
));
1906 * This is a special get_block_t callback which is used by
1907 * ext4_da_write_begin(). It will either return mapped block or
1908 * reserve space for a single block.
1910 * For delayed buffer_head we have BH_Mapped, BH_New, BH_Delay set.
1911 * We also have b_blocknr = -1 and b_bdev initialized properly
1913 * For unwritten buffer_head we have BH_Mapped, BH_New, BH_Unwritten set.
1914 * We also have b_blocknr = physicalblock mapping unwritten extent and b_bdev
1915 * initialized properly.
1917 int ext4_da_get_block_prep(struct inode
*inode
, sector_t iblock
,
1918 struct buffer_head
*bh
, int create
)
1920 struct ext4_map_blocks map
;
1923 BUG_ON(create
== 0);
1924 BUG_ON(bh
->b_size
!= inode
->i_sb
->s_blocksize
);
1926 map
.m_lblk
= iblock
;
1930 * first, we need to know whether the block is allocated already
1931 * preallocated blocks are unmapped but should treated
1932 * the same as allocated blocks.
1934 ret
= ext4_da_map_blocks(inode
, iblock
, &map
, bh
);
1938 map_bh(bh
, inode
->i_sb
, map
.m_pblk
);
1939 ext4_update_bh_state(bh
, map
.m_flags
);
1941 if (buffer_unwritten(bh
)) {
1942 /* A delayed write to unwritten bh should be marked
1943 * new and mapped. Mapped ensures that we don't do
1944 * get_block multiple times when we write to the same
1945 * offset and new ensures that we do proper zero out
1946 * for partial write.
1949 set_buffer_mapped(bh
);
1954 static int bget_one(handle_t
*handle
, struct buffer_head
*bh
)
1960 static int bput_one(handle_t
*handle
, struct buffer_head
*bh
)
1966 static int __ext4_journalled_writepage(struct page
*page
,
1969 struct address_space
*mapping
= page
->mapping
;
1970 struct inode
*inode
= mapping
->host
;
1971 struct buffer_head
*page_bufs
= NULL
;
1972 handle_t
*handle
= NULL
;
1973 int ret
= 0, err
= 0;
1974 int inline_data
= ext4_has_inline_data(inode
);
1975 struct buffer_head
*inode_bh
= NULL
;
1977 ClearPageChecked(page
);
1980 BUG_ON(page
->index
!= 0);
1981 BUG_ON(len
> ext4_get_max_inline_size(inode
));
1982 inode_bh
= ext4_journalled_write_inline_data(inode
, len
, page
);
1983 if (inode_bh
== NULL
)
1986 page_bufs
= page_buffers(page
);
1991 ext4_walk_page_buffers(handle
, page_bufs
, 0, len
,
1995 * We need to release the page lock before we start the
1996 * journal, so grab a reference so the page won't disappear
1997 * out from under us.
2002 handle
= ext4_journal_start(inode
, EXT4_HT_WRITE_PAGE
,
2003 ext4_writepage_trans_blocks(inode
));
2004 if (IS_ERR(handle
)) {
2005 ret
= PTR_ERR(handle
);
2007 goto out_no_pagelock
;
2009 BUG_ON(!ext4_handle_valid(handle
));
2013 if (page
->mapping
!= mapping
) {
2014 /* The page got truncated from under us */
2015 ext4_journal_stop(handle
);
2021 BUFFER_TRACE(inode_bh
, "get write access");
2022 ret
= ext4_journal_get_write_access(handle
, inode_bh
);
2024 err
= ext4_handle_dirty_metadata(handle
, inode
, inode_bh
);
2027 ret
= ext4_walk_page_buffers(handle
, page_bufs
, 0, len
, NULL
,
2028 do_journal_get_write_access
);
2030 err
= ext4_walk_page_buffers(handle
, page_bufs
, 0, len
, NULL
,
2035 EXT4_I(inode
)->i_datasync_tid
= handle
->h_transaction
->t_tid
;
2036 err
= ext4_journal_stop(handle
);
2040 if (!ext4_has_inline_data(inode
))
2041 ext4_walk_page_buffers(NULL
, page_bufs
, 0, len
,
2043 ext4_set_inode_state(inode
, EXT4_STATE_JDATA
);
2052 * Note that we don't need to start a transaction unless we're journaling data
2053 * because we should have holes filled from ext4_page_mkwrite(). We even don't
2054 * need to file the inode to the transaction's list in ordered mode because if
2055 * we are writing back data added by write(), the inode is already there and if
2056 * we are writing back data modified via mmap(), no one guarantees in which
2057 * transaction the data will hit the disk. In case we are journaling data, we
2058 * cannot start transaction directly because transaction start ranks above page
2059 * lock so we have to do some magic.
2061 * This function can get called via...
2062 * - ext4_writepages after taking page lock (have journal handle)
2063 * - journal_submit_inode_data_buffers (no journal handle)
2064 * - shrink_page_list via the kswapd/direct reclaim (no journal handle)
2065 * - grab_page_cache when doing write_begin (have journal handle)
2067 * We don't do any block allocation in this function. If we have page with
2068 * multiple blocks we need to write those buffer_heads that are mapped. This
2069 * is important for mmaped based write. So if we do with blocksize 1K
2070 * truncate(f, 1024);
2071 * a = mmap(f, 0, 4096);
2073 * truncate(f, 4096);
2074 * we have in the page first buffer_head mapped via page_mkwrite call back
2075 * but other buffer_heads would be unmapped but dirty (dirty done via the
2076 * do_wp_page). So writepage should write the first block. If we modify
2077 * the mmap area beyond 1024 we will again get a page_fault and the
2078 * page_mkwrite callback will do the block allocation and mark the
2079 * buffer_heads mapped.
2081 * We redirty the page if we have any buffer_heads that is either delay or
2082 * unwritten in the page.
2084 * We can get recursively called as show below.
2086 * ext4_writepage() -> kmalloc() -> __alloc_pages() -> page_launder() ->
2089 * But since we don't do any block allocation we should not deadlock.
2090 * Page also have the dirty flag cleared so we don't get recurive page_lock.
2092 static int ext4_writepage(struct page
*page
,
2093 struct writeback_control
*wbc
)
2098 struct buffer_head
*page_bufs
= NULL
;
2099 struct inode
*inode
= page
->mapping
->host
;
2100 struct ext4_io_submit io_submit
;
2101 bool keep_towrite
= false;
2103 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode
->i_sb
)))) {
2104 ext4_invalidatepage(page
, 0, PAGE_SIZE
);
2109 trace_ext4_writepage(page
);
2110 size
= i_size_read(inode
);
2111 if (page
->index
== size
>> PAGE_SHIFT
)
2112 len
= size
& ~PAGE_MASK
;
2116 page_bufs
= page_buffers(page
);
2118 * We cannot do block allocation or other extent handling in this
2119 * function. If there are buffers needing that, we have to redirty
2120 * the page. But we may reach here when we do a journal commit via
2121 * journal_submit_inode_data_buffers() and in that case we must write
2122 * allocated buffers to achieve data=ordered mode guarantees.
2124 * Also, if there is only one buffer per page (the fs block
2125 * size == the page size), if one buffer needs block
2126 * allocation or needs to modify the extent tree to clear the
2127 * unwritten flag, we know that the page can't be written at
2128 * all, so we might as well refuse the write immediately.
2129 * Unfortunately if the block size != page size, we can't as
2130 * easily detect this case using ext4_walk_page_buffers(), but
2131 * for the extremely common case, this is an optimization that
2132 * skips a useless round trip through ext4_bio_write_page().
2134 if (ext4_walk_page_buffers(NULL
, page_bufs
, 0, len
, NULL
,
2135 ext4_bh_delay_or_unwritten
)) {
2136 redirty_page_for_writepage(wbc
, page
);
2137 if ((current
->flags
& PF_MEMALLOC
) ||
2138 (inode
->i_sb
->s_blocksize
== PAGE_SIZE
)) {
2140 * For memory cleaning there's no point in writing only
2141 * some buffers. So just bail out. Warn if we came here
2142 * from direct reclaim.
2144 WARN_ON_ONCE((current
->flags
& (PF_MEMALLOC
|PF_KSWAPD
))
2149 keep_towrite
= true;
2152 if (PageChecked(page
) && ext4_should_journal_data(inode
))
2154 * It's mmapped pagecache. Add buffers and journal it. There
2155 * doesn't seem much point in redirtying the page here.
2157 return __ext4_journalled_writepage(page
, len
);
2159 ext4_io_submit_init(&io_submit
, wbc
);
2160 io_submit
.io_end
= ext4_init_io_end(inode
, GFP_NOFS
);
2161 if (!io_submit
.io_end
) {
2162 redirty_page_for_writepage(wbc
, page
);
2166 ret
= ext4_bio_write_page(&io_submit
, page
, len
, wbc
, keep_towrite
);
2167 ext4_io_submit(&io_submit
);
2168 /* Drop io_end reference we got from init */
2169 ext4_put_io_end_defer(io_submit
.io_end
);
2173 static int mpage_submit_page(struct mpage_da_data
*mpd
, struct page
*page
)
2179 BUG_ON(page
->index
!= mpd
->first_page
);
2180 clear_page_dirty_for_io(page
);
2182 * We have to be very careful here! Nothing protects writeback path
2183 * against i_size changes and the page can be writeably mapped into
2184 * page tables. So an application can be growing i_size and writing
2185 * data through mmap while writeback runs. clear_page_dirty_for_io()
2186 * write-protects our page in page tables and the page cannot get
2187 * written to again until we release page lock. So only after
2188 * clear_page_dirty_for_io() we are safe to sample i_size for
2189 * ext4_bio_write_page() to zero-out tail of the written page. We rely
2190 * on the barrier provided by TestClearPageDirty in
2191 * clear_page_dirty_for_io() to make sure i_size is really sampled only
2192 * after page tables are updated.
2194 size
= i_size_read(mpd
->inode
);
2195 if (page
->index
== size
>> PAGE_SHIFT
)
2196 len
= size
& ~PAGE_MASK
;
2199 err
= ext4_bio_write_page(&mpd
->io_submit
, page
, len
, mpd
->wbc
, false);
2201 mpd
->wbc
->nr_to_write
--;
2207 #define BH_FLAGS ((1 << BH_Unwritten) | (1 << BH_Delay))
2210 * mballoc gives us at most this number of blocks...
2211 * XXX: That seems to be only a limitation of ext4_mb_normalize_request().
2212 * The rest of mballoc seems to handle chunks up to full group size.
2214 #define MAX_WRITEPAGES_EXTENT_LEN 2048
2217 * mpage_add_bh_to_extent - try to add bh to extent of blocks to map
2219 * @mpd - extent of blocks
2220 * @lblk - logical number of the block in the file
2221 * @bh - buffer head we want to add to the extent
2223 * The function is used to collect contig. blocks in the same state. If the
2224 * buffer doesn't require mapping for writeback and we haven't started the
2225 * extent of buffers to map yet, the function returns 'true' immediately - the
2226 * caller can write the buffer right away. Otherwise the function returns true
2227 * if the block has been added to the extent, false if the block couldn't be
2230 static bool mpage_add_bh_to_extent(struct mpage_da_data
*mpd
, ext4_lblk_t lblk
,
2231 struct buffer_head
*bh
)
2233 struct ext4_map_blocks
*map
= &mpd
->map
;
2235 /* Buffer that doesn't need mapping for writeback? */
2236 if (!buffer_dirty(bh
) || !buffer_mapped(bh
) ||
2237 (!buffer_delay(bh
) && !buffer_unwritten(bh
))) {
2238 /* So far no extent to map => we write the buffer right away */
2239 if (map
->m_len
== 0)
2244 /* First block in the extent? */
2245 if (map
->m_len
== 0) {
2246 /* We cannot map unless handle is started... */
2251 map
->m_flags
= bh
->b_state
& BH_FLAGS
;
2255 /* Don't go larger than mballoc is willing to allocate */
2256 if (map
->m_len
>= MAX_WRITEPAGES_EXTENT_LEN
)
2259 /* Can we merge the block to our big extent? */
2260 if (lblk
== map
->m_lblk
+ map
->m_len
&&
2261 (bh
->b_state
& BH_FLAGS
) == map
->m_flags
) {
2269 * mpage_process_page_bufs - submit page buffers for IO or add them to extent
2271 * @mpd - extent of blocks for mapping
2272 * @head - the first buffer in the page
2273 * @bh - buffer we should start processing from
2274 * @lblk - logical number of the block in the file corresponding to @bh
2276 * Walk through page buffers from @bh upto @head (exclusive) and either submit
2277 * the page for IO if all buffers in this page were mapped and there's no
2278 * accumulated extent of buffers to map or add buffers in the page to the
2279 * extent of buffers to map. The function returns 1 if the caller can continue
2280 * by processing the next page, 0 if it should stop adding buffers to the
2281 * extent to map because we cannot extend it anymore. It can also return value
2282 * < 0 in case of error during IO submission.
2284 static int mpage_process_page_bufs(struct mpage_da_data
*mpd
,
2285 struct buffer_head
*head
,
2286 struct buffer_head
*bh
,
2289 struct inode
*inode
= mpd
->inode
;
2291 ext4_lblk_t blocks
= (i_size_read(inode
) + i_blocksize(inode
) - 1)
2292 >> inode
->i_blkbits
;
2295 BUG_ON(buffer_locked(bh
));
2297 if (lblk
>= blocks
|| !mpage_add_bh_to_extent(mpd
, lblk
, bh
)) {
2298 /* Found extent to map? */
2301 /* Buffer needs mapping and handle is not started? */
2304 /* Everything mapped so far and we hit EOF */
2307 } while (lblk
++, (bh
= bh
->b_this_page
) != head
);
2308 /* So far everything mapped? Submit the page for IO. */
2309 if (mpd
->map
.m_len
== 0) {
2310 err
= mpage_submit_page(mpd
, head
->b_page
);
2314 return lblk
< blocks
;
2318 * mpage_map_buffers - update buffers corresponding to changed extent and
2319 * submit fully mapped pages for IO
2321 * @mpd - description of extent to map, on return next extent to map
2323 * Scan buffers corresponding to changed extent (we expect corresponding pages
2324 * to be already locked) and update buffer state according to new extent state.
2325 * We map delalloc buffers to their physical location, clear unwritten bits,
2326 * and mark buffers as uninit when we perform writes to unwritten extents
2327 * and do extent conversion after IO is finished. If the last page is not fully
2328 * mapped, we update @map to the next extent in the last page that needs
2329 * mapping. Otherwise we submit the page for IO.
2331 static int mpage_map_and_submit_buffers(struct mpage_da_data
*mpd
)
2333 struct pagevec pvec
;
2335 struct inode
*inode
= mpd
->inode
;
2336 struct buffer_head
*head
, *bh
;
2337 int bpp_bits
= PAGE_SHIFT
- inode
->i_blkbits
;
2343 start
= mpd
->map
.m_lblk
>> bpp_bits
;
2344 end
= (mpd
->map
.m_lblk
+ mpd
->map
.m_len
- 1) >> bpp_bits
;
2345 lblk
= start
<< bpp_bits
;
2346 pblock
= mpd
->map
.m_pblk
;
2348 pagevec_init(&pvec
, 0);
2349 while (start
<= end
) {
2350 nr_pages
= pagevec_lookup_range(&pvec
, inode
->i_mapping
,
2354 for (i
= 0; i
< nr_pages
; i
++) {
2355 struct page
*page
= pvec
.pages
[i
];
2357 bh
= head
= page_buffers(page
);
2359 if (lblk
< mpd
->map
.m_lblk
)
2361 if (lblk
>= mpd
->map
.m_lblk
+ mpd
->map
.m_len
) {
2363 * Buffer after end of mapped extent.
2364 * Find next buffer in the page to map.
2367 mpd
->map
.m_flags
= 0;
2369 * FIXME: If dioread_nolock supports
2370 * blocksize < pagesize, we need to make
2371 * sure we add size mapped so far to
2372 * io_end->size as the following call
2373 * can submit the page for IO.
2375 err
= mpage_process_page_bufs(mpd
, head
,
2377 pagevec_release(&pvec
);
2382 if (buffer_delay(bh
)) {
2383 clear_buffer_delay(bh
);
2384 bh
->b_blocknr
= pblock
++;
2386 clear_buffer_unwritten(bh
);
2387 } while (lblk
++, (bh
= bh
->b_this_page
) != head
);
2390 * FIXME: This is going to break if dioread_nolock
2391 * supports blocksize < pagesize as we will try to
2392 * convert potentially unmapped parts of inode.
2394 mpd
->io_submit
.io_end
->size
+= PAGE_SIZE
;
2395 /* Page fully mapped - let IO run! */
2396 err
= mpage_submit_page(mpd
, page
);
2398 pagevec_release(&pvec
);
2402 pagevec_release(&pvec
);
2404 /* Extent fully mapped and matches with page boundary. We are done. */
2406 mpd
->map
.m_flags
= 0;
2410 static int mpage_map_one_extent(handle_t
*handle
, struct mpage_da_data
*mpd
)
2412 struct inode
*inode
= mpd
->inode
;
2413 struct ext4_map_blocks
*map
= &mpd
->map
;
2414 int get_blocks_flags
;
2415 int err
, dioread_nolock
;
2417 trace_ext4_da_write_pages_extent(inode
, map
);
2419 * Call ext4_map_blocks() to allocate any delayed allocation blocks, or
2420 * to convert an unwritten extent to be initialized (in the case
2421 * where we have written into one or more preallocated blocks). It is
2422 * possible that we're going to need more metadata blocks than
2423 * previously reserved. However we must not fail because we're in
2424 * writeback and there is nothing we can do about it so it might result
2425 * in data loss. So use reserved blocks to allocate metadata if
2428 * We pass in the magic EXT4_GET_BLOCKS_DELALLOC_RESERVE if
2429 * the blocks in question are delalloc blocks. This indicates
2430 * that the blocks and quotas has already been checked when
2431 * the data was copied into the page cache.
2433 get_blocks_flags
= EXT4_GET_BLOCKS_CREATE
|
2434 EXT4_GET_BLOCKS_METADATA_NOFAIL
|
2435 EXT4_GET_BLOCKS_IO_SUBMIT
;
2436 dioread_nolock
= ext4_should_dioread_nolock(inode
);
2438 get_blocks_flags
|= EXT4_GET_BLOCKS_IO_CREATE_EXT
;
2439 if (map
->m_flags
& (1 << BH_Delay
))
2440 get_blocks_flags
|= EXT4_GET_BLOCKS_DELALLOC_RESERVE
;
2442 err
= ext4_map_blocks(handle
, inode
, map
, get_blocks_flags
);
2445 if (dioread_nolock
&& (map
->m_flags
& EXT4_MAP_UNWRITTEN
)) {
2446 if (!mpd
->io_submit
.io_end
->handle
&&
2447 ext4_handle_valid(handle
)) {
2448 mpd
->io_submit
.io_end
->handle
= handle
->h_rsv_handle
;
2449 handle
->h_rsv_handle
= NULL
;
2451 ext4_set_io_unwritten_flag(inode
, mpd
->io_submit
.io_end
);
2454 BUG_ON(map
->m_len
== 0);
2455 if (map
->m_flags
& EXT4_MAP_NEW
) {
2456 clean_bdev_aliases(inode
->i_sb
->s_bdev
, map
->m_pblk
,
2463 * mpage_map_and_submit_extent - map extent starting at mpd->lblk of length
2464 * mpd->len and submit pages underlying it for IO
2466 * @handle - handle for journal operations
2467 * @mpd - extent to map
2468 * @give_up_on_write - we set this to true iff there is a fatal error and there
2469 * is no hope of writing the data. The caller should discard
2470 * dirty pages to avoid infinite loops.
2472 * The function maps extent starting at mpd->lblk of length mpd->len. If it is
2473 * delayed, blocks are allocated, if it is unwritten, we may need to convert
2474 * them to initialized or split the described range from larger unwritten
2475 * extent. Note that we need not map all the described range since allocation
2476 * can return less blocks or the range is covered by more unwritten extents. We
2477 * cannot map more because we are limited by reserved transaction credits. On
2478 * the other hand we always make sure that the last touched page is fully
2479 * mapped so that it can be written out (and thus forward progress is
2480 * guaranteed). After mapping we submit all mapped pages for IO.
2482 static int mpage_map_and_submit_extent(handle_t
*handle
,
2483 struct mpage_da_data
*mpd
,
2484 bool *give_up_on_write
)
2486 struct inode
*inode
= mpd
->inode
;
2487 struct ext4_map_blocks
*map
= &mpd
->map
;
2492 mpd
->io_submit
.io_end
->offset
=
2493 ((loff_t
)map
->m_lblk
) << inode
->i_blkbits
;
2495 err
= mpage_map_one_extent(handle
, mpd
);
2497 struct super_block
*sb
= inode
->i_sb
;
2499 if (ext4_forced_shutdown(EXT4_SB(sb
)) ||
2500 EXT4_SB(sb
)->s_mount_flags
& EXT4_MF_FS_ABORTED
)
2501 goto invalidate_dirty_pages
;
2503 * Let the uper layers retry transient errors.
2504 * In the case of ENOSPC, if ext4_count_free_blocks()
2505 * is non-zero, a commit should free up blocks.
2507 if ((err
== -ENOMEM
) ||
2508 (err
== -ENOSPC
&& ext4_count_free_clusters(sb
))) {
2510 goto update_disksize
;
2513 ext4_msg(sb
, KERN_CRIT
,
2514 "Delayed block allocation failed for "
2515 "inode %lu at logical offset %llu with"
2516 " max blocks %u with error %d",
2518 (unsigned long long)map
->m_lblk
,
2519 (unsigned)map
->m_len
, -err
);
2520 ext4_msg(sb
, KERN_CRIT
,
2521 "This should not happen!! Data will "
2524 ext4_print_free_blocks(inode
);
2525 invalidate_dirty_pages
:
2526 *give_up_on_write
= true;
2531 * Update buffer state, submit mapped pages, and get us new
2534 err
= mpage_map_and_submit_buffers(mpd
);
2536 goto update_disksize
;
2537 } while (map
->m_len
);
2541 * Update on-disk size after IO is submitted. Races with
2542 * truncate are avoided by checking i_size under i_data_sem.
2544 disksize
= ((loff_t
)mpd
->first_page
) << PAGE_SHIFT
;
2545 if (disksize
> EXT4_I(inode
)->i_disksize
) {
2549 down_write(&EXT4_I(inode
)->i_data_sem
);
2550 i_size
= i_size_read(inode
);
2551 if (disksize
> i_size
)
2553 if (disksize
> EXT4_I(inode
)->i_disksize
)
2554 EXT4_I(inode
)->i_disksize
= disksize
;
2555 up_write(&EXT4_I(inode
)->i_data_sem
);
2556 err2
= ext4_mark_inode_dirty(handle
, inode
);
2558 ext4_error(inode
->i_sb
,
2559 "Failed to mark inode %lu dirty",
2568 * Calculate the total number of credits to reserve for one writepages
2569 * iteration. This is called from ext4_writepages(). We map an extent of
2570 * up to MAX_WRITEPAGES_EXTENT_LEN blocks and then we go on and finish mapping
2571 * the last partial page. So in total we can map MAX_WRITEPAGES_EXTENT_LEN +
2572 * bpp - 1 blocks in bpp different extents.
2574 static int ext4_da_writepages_trans_blocks(struct inode
*inode
)
2576 int bpp
= ext4_journal_blocks_per_page(inode
);
2578 return ext4_meta_trans_blocks(inode
,
2579 MAX_WRITEPAGES_EXTENT_LEN
+ bpp
- 1, bpp
);
2583 * mpage_prepare_extent_to_map - find & lock contiguous range of dirty pages
2584 * and underlying extent to map
2586 * @mpd - where to look for pages
2588 * Walk dirty pages in the mapping. If they are fully mapped, submit them for
2589 * IO immediately. When we find a page which isn't mapped we start accumulating
2590 * extent of buffers underlying these pages that needs mapping (formed by
2591 * either delayed or unwritten buffers). We also lock the pages containing
2592 * these buffers. The extent found is returned in @mpd structure (starting at
2593 * mpd->lblk with length mpd->len blocks).
2595 * Note that this function can attach bios to one io_end structure which are
2596 * neither logically nor physically contiguous. Although it may seem as an
2597 * unnecessary complication, it is actually inevitable in blocksize < pagesize
2598 * case as we need to track IO to all buffers underlying a page in one io_end.
2600 static int mpage_prepare_extent_to_map(struct mpage_da_data
*mpd
)
2602 struct address_space
*mapping
= mpd
->inode
->i_mapping
;
2603 struct pagevec pvec
;
2604 unsigned int nr_pages
;
2605 long left
= mpd
->wbc
->nr_to_write
;
2606 pgoff_t index
= mpd
->first_page
;
2607 pgoff_t end
= mpd
->last_page
;
2610 int blkbits
= mpd
->inode
->i_blkbits
;
2612 struct buffer_head
*head
;
2614 if (mpd
->wbc
->sync_mode
== WB_SYNC_ALL
|| mpd
->wbc
->tagged_writepages
)
2615 tag
= PAGECACHE_TAG_TOWRITE
;
2617 tag
= PAGECACHE_TAG_DIRTY
;
2619 pagevec_init(&pvec
, 0);
2621 mpd
->next_page
= index
;
2622 while (index
<= end
) {
2623 nr_pages
= pagevec_lookup_tag(&pvec
, mapping
, &index
, tag
,
2624 min(end
- index
, (pgoff_t
)PAGEVEC_SIZE
-1) + 1);
2628 for (i
= 0; i
< nr_pages
; i
++) {
2629 struct page
*page
= pvec
.pages
[i
];
2632 * At this point, the page may be truncated or
2633 * invalidated (changing page->mapping to NULL), or
2634 * even swizzled back from swapper_space to tmpfs file
2635 * mapping. However, page->index will not change
2636 * because we have a reference on the page.
2638 if (page
->index
> end
)
2642 * Accumulated enough dirty pages? This doesn't apply
2643 * to WB_SYNC_ALL mode. For integrity sync we have to
2644 * keep going because someone may be concurrently
2645 * dirtying pages, and we might have synced a lot of
2646 * newly appeared dirty pages, but have not synced all
2647 * of the old dirty pages.
2649 if (mpd
->wbc
->sync_mode
== WB_SYNC_NONE
&& left
<= 0)
2652 /* If we can't merge this page, we are done. */
2653 if (mpd
->map
.m_len
> 0 && mpd
->next_page
!= page
->index
)
2658 * If the page is no longer dirty, or its mapping no
2659 * longer corresponds to inode we are writing (which
2660 * means it has been truncated or invalidated), or the
2661 * page is already under writeback and we are not doing
2662 * a data integrity writeback, skip the page
2664 if (!PageDirty(page
) ||
2665 (PageWriteback(page
) &&
2666 (mpd
->wbc
->sync_mode
== WB_SYNC_NONE
)) ||
2667 unlikely(page
->mapping
!= mapping
)) {
2672 wait_on_page_writeback(page
);
2673 BUG_ON(PageWriteback(page
));
2675 if (mpd
->map
.m_len
== 0)
2676 mpd
->first_page
= page
->index
;
2677 mpd
->next_page
= page
->index
+ 1;
2678 /* Add all dirty buffers to mpd */
2679 lblk
= ((ext4_lblk_t
)page
->index
) <<
2680 (PAGE_SHIFT
- blkbits
);
2681 head
= page_buffers(page
);
2682 err
= mpage_process_page_bufs(mpd
, head
, head
, lblk
);
2688 pagevec_release(&pvec
);
2693 pagevec_release(&pvec
);
2697 static int __writepage(struct page
*page
, struct writeback_control
*wbc
,
2700 struct address_space
*mapping
= data
;
2701 int ret
= ext4_writepage(page
, wbc
);
2702 mapping_set_error(mapping
, ret
);
2706 static int ext4_writepages(struct address_space
*mapping
,
2707 struct writeback_control
*wbc
)
2709 pgoff_t writeback_index
= 0;
2710 long nr_to_write
= wbc
->nr_to_write
;
2711 int range_whole
= 0;
2713 handle_t
*handle
= NULL
;
2714 struct mpage_da_data mpd
;
2715 struct inode
*inode
= mapping
->host
;
2716 int needed_blocks
, rsv_blocks
= 0, ret
= 0;
2717 struct ext4_sb_info
*sbi
= EXT4_SB(mapping
->host
->i_sb
);
2719 struct blk_plug plug
;
2720 bool give_up_on_write
= false;
2722 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode
->i_sb
))))
2725 percpu_down_read(&sbi
->s_journal_flag_rwsem
);
2726 trace_ext4_writepages(inode
, wbc
);
2728 if (dax_mapping(mapping
)) {
2729 ret
= dax_writeback_mapping_range(mapping
, inode
->i_sb
->s_bdev
,
2731 goto out_writepages
;
2735 * No pages to write? This is mainly a kludge to avoid starting
2736 * a transaction for special inodes like journal inode on last iput()
2737 * because that could violate lock ordering on umount
2739 if (!mapping
->nrpages
|| !mapping_tagged(mapping
, PAGECACHE_TAG_DIRTY
))
2740 goto out_writepages
;
2742 if (ext4_should_journal_data(inode
)) {
2743 struct blk_plug plug
;
2745 blk_start_plug(&plug
);
2746 ret
= write_cache_pages(mapping
, wbc
, __writepage
, mapping
);
2747 blk_finish_plug(&plug
);
2748 goto out_writepages
;
2752 * If the filesystem has aborted, it is read-only, so return
2753 * right away instead of dumping stack traces later on that
2754 * will obscure the real source of the problem. We test
2755 * EXT4_MF_FS_ABORTED instead of sb->s_flag's MS_RDONLY because
2756 * the latter could be true if the filesystem is mounted
2757 * read-only, and in that case, ext4_writepages should
2758 * *never* be called, so if that ever happens, we would want
2761 if (unlikely(ext4_forced_shutdown(EXT4_SB(mapping
->host
->i_sb
)) ||
2762 sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)) {
2764 goto out_writepages
;
2767 if (ext4_should_dioread_nolock(inode
)) {
2769 * We may need to convert up to one extent per block in
2770 * the page and we may dirty the inode.
2772 rsv_blocks
= 1 + (PAGE_SIZE
>> inode
->i_blkbits
);
2776 * If we have inline data and arrive here, it means that
2777 * we will soon create the block for the 1st page, so
2778 * we'd better clear the inline data here.
2780 if (ext4_has_inline_data(inode
)) {
2781 /* Just inode will be modified... */
2782 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 1);
2783 if (IS_ERR(handle
)) {
2784 ret
= PTR_ERR(handle
);
2785 goto out_writepages
;
2787 BUG_ON(ext4_test_inode_state(inode
,
2788 EXT4_STATE_MAY_INLINE_DATA
));
2789 ext4_destroy_inline_data(handle
, inode
);
2790 ext4_journal_stop(handle
);
2793 if (wbc
->range_start
== 0 && wbc
->range_end
== LLONG_MAX
)
2796 if (wbc
->range_cyclic
) {
2797 writeback_index
= mapping
->writeback_index
;
2798 if (writeback_index
)
2800 mpd
.first_page
= writeback_index
;
2803 mpd
.first_page
= wbc
->range_start
>> PAGE_SHIFT
;
2804 mpd
.last_page
= wbc
->range_end
>> PAGE_SHIFT
;
2809 ext4_io_submit_init(&mpd
.io_submit
, wbc
);
2811 if (wbc
->sync_mode
== WB_SYNC_ALL
|| wbc
->tagged_writepages
)
2812 tag_pages_for_writeback(mapping
, mpd
.first_page
, mpd
.last_page
);
2814 blk_start_plug(&plug
);
2817 * First writeback pages that don't need mapping - we can avoid
2818 * starting a transaction unnecessarily and also avoid being blocked
2819 * in the block layer on device congestion while having transaction
2823 mpd
.io_submit
.io_end
= ext4_init_io_end(inode
, GFP_KERNEL
);
2824 if (!mpd
.io_submit
.io_end
) {
2828 ret
= mpage_prepare_extent_to_map(&mpd
);
2829 /* Submit prepared bio */
2830 ext4_io_submit(&mpd
.io_submit
);
2831 ext4_put_io_end_defer(mpd
.io_submit
.io_end
);
2832 mpd
.io_submit
.io_end
= NULL
;
2833 /* Unlock pages we didn't use */
2834 mpage_release_unused_pages(&mpd
, false);
2838 while (!done
&& mpd
.first_page
<= mpd
.last_page
) {
2839 /* For each extent of pages we use new io_end */
2840 mpd
.io_submit
.io_end
= ext4_init_io_end(inode
, GFP_KERNEL
);
2841 if (!mpd
.io_submit
.io_end
) {
2847 * We have two constraints: We find one extent to map and we
2848 * must always write out whole page (makes a difference when
2849 * blocksize < pagesize) so that we don't block on IO when we
2850 * try to write out the rest of the page. Journalled mode is
2851 * not supported by delalloc.
2853 BUG_ON(ext4_should_journal_data(inode
));
2854 needed_blocks
= ext4_da_writepages_trans_blocks(inode
);
2856 /* start a new transaction */
2857 handle
= ext4_journal_start_with_reserve(inode
,
2858 EXT4_HT_WRITE_PAGE
, needed_blocks
, rsv_blocks
);
2859 if (IS_ERR(handle
)) {
2860 ret
= PTR_ERR(handle
);
2861 ext4_msg(inode
->i_sb
, KERN_CRIT
, "%s: jbd2_start: "
2862 "%ld pages, ino %lu; err %d", __func__
,
2863 wbc
->nr_to_write
, inode
->i_ino
, ret
);
2864 /* Release allocated io_end */
2865 ext4_put_io_end(mpd
.io_submit
.io_end
);
2866 mpd
.io_submit
.io_end
= NULL
;
2871 trace_ext4_da_write_pages(inode
, mpd
.first_page
, mpd
.wbc
);
2872 ret
= mpage_prepare_extent_to_map(&mpd
);
2875 ret
= mpage_map_and_submit_extent(handle
, &mpd
,
2879 * We scanned the whole range (or exhausted
2880 * nr_to_write), submitted what was mapped and
2881 * didn't find anything needing mapping. We are
2888 * Caution: If the handle is synchronous,
2889 * ext4_journal_stop() can wait for transaction commit
2890 * to finish which may depend on writeback of pages to
2891 * complete or on page lock to be released. In that
2892 * case, we have to wait until after after we have
2893 * submitted all the IO, released page locks we hold,
2894 * and dropped io_end reference (for extent conversion
2895 * to be able to complete) before stopping the handle.
2897 if (!ext4_handle_valid(handle
) || handle
->h_sync
== 0) {
2898 ext4_journal_stop(handle
);
2902 /* Submit prepared bio */
2903 ext4_io_submit(&mpd
.io_submit
);
2904 /* Unlock pages we didn't use */
2905 mpage_release_unused_pages(&mpd
, give_up_on_write
);
2907 * Drop our io_end reference we got from init. We have
2908 * to be careful and use deferred io_end finishing if
2909 * we are still holding the transaction as we can
2910 * release the last reference to io_end which may end
2911 * up doing unwritten extent conversion.
2914 ext4_put_io_end_defer(mpd
.io_submit
.io_end
);
2915 ext4_journal_stop(handle
);
2917 ext4_put_io_end(mpd
.io_submit
.io_end
);
2918 mpd
.io_submit
.io_end
= NULL
;
2920 if (ret
== -ENOSPC
&& sbi
->s_journal
) {
2922 * Commit the transaction which would
2923 * free blocks released in the transaction
2926 jbd2_journal_force_commit_nested(sbi
->s_journal
);
2930 /* Fatal error - ENOMEM, EIO... */
2935 blk_finish_plug(&plug
);
2936 if (!ret
&& !cycled
&& wbc
->nr_to_write
> 0) {
2938 mpd
.last_page
= writeback_index
- 1;
2944 if (wbc
->range_cyclic
|| (range_whole
&& wbc
->nr_to_write
> 0))
2946 * Set the writeback_index so that range_cyclic
2947 * mode will write it back later
2949 mapping
->writeback_index
= mpd
.first_page
;
2952 trace_ext4_writepages_result(inode
, wbc
, ret
,
2953 nr_to_write
- wbc
->nr_to_write
);
2954 percpu_up_read(&sbi
->s_journal_flag_rwsem
);
2958 static int ext4_nonda_switch(struct super_block
*sb
)
2960 s64 free_clusters
, dirty_clusters
;
2961 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2964 * switch to non delalloc mode if we are running low
2965 * on free block. The free block accounting via percpu
2966 * counters can get slightly wrong with percpu_counter_batch getting
2967 * accumulated on each CPU without updating global counters
2968 * Delalloc need an accurate free block accounting. So switch
2969 * to non delalloc when we are near to error range.
2972 percpu_counter_read_positive(&sbi
->s_freeclusters_counter
);
2974 percpu_counter_read_positive(&sbi
->s_dirtyclusters_counter
);
2976 * Start pushing delalloc when 1/2 of free blocks are dirty.
2978 if (dirty_clusters
&& (free_clusters
< 2 * dirty_clusters
))
2979 try_to_writeback_inodes_sb(sb
, WB_REASON_FS_FREE_SPACE
);
2981 if (2 * free_clusters
< 3 * dirty_clusters
||
2982 free_clusters
< (dirty_clusters
+ EXT4_FREECLUSTERS_WATERMARK
)) {
2984 * free block count is less than 150% of dirty blocks
2985 * or free blocks is less than watermark
2992 /* We always reserve for an inode update; the superblock could be there too */
2993 static int ext4_da_write_credits(struct inode
*inode
, loff_t pos
, unsigned len
)
2995 if (likely(ext4_has_feature_large_file(inode
->i_sb
)))
2998 if (pos
+ len
<= 0x7fffffffULL
)
3001 /* We might need to update the superblock to set LARGE_FILE */
3005 static int ext4_da_write_begin(struct file
*file
, struct address_space
*mapping
,
3006 loff_t pos
, unsigned len
, unsigned flags
,
3007 struct page
**pagep
, void **fsdata
)
3009 int ret
, retries
= 0;
3012 struct inode
*inode
= mapping
->host
;
3015 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode
->i_sb
))))
3018 index
= pos
>> PAGE_SHIFT
;
3020 if (ext4_nonda_switch(inode
->i_sb
) ||
3021 S_ISLNK(inode
->i_mode
)) {
3022 *fsdata
= (void *)FALL_BACK_TO_NONDELALLOC
;
3023 return ext4_write_begin(file
, mapping
, pos
,
3024 len
, flags
, pagep
, fsdata
);
3026 *fsdata
= (void *)0;
3027 trace_ext4_da_write_begin(inode
, pos
, len
, flags
);
3029 if (ext4_test_inode_state(inode
, EXT4_STATE_MAY_INLINE_DATA
)) {
3030 ret
= ext4_da_write_inline_data_begin(mapping
, inode
,
3040 * grab_cache_page_write_begin() can take a long time if the
3041 * system is thrashing due to memory pressure, or if the page
3042 * is being written back. So grab it first before we start
3043 * the transaction handle. This also allows us to allocate
3044 * the page (if needed) without using GFP_NOFS.
3047 page
= grab_cache_page_write_begin(mapping
, index
, flags
);
3053 * With delayed allocation, we don't log the i_disksize update
3054 * if there is delayed block allocation. But we still need
3055 * to journalling the i_disksize update if writes to the end
3056 * of file which has an already mapped buffer.
3059 handle
= ext4_journal_start(inode
, EXT4_HT_WRITE_PAGE
,
3060 ext4_da_write_credits(inode
, pos
, len
));
3061 if (IS_ERR(handle
)) {
3063 return PTR_ERR(handle
);
3067 if (page
->mapping
!= mapping
) {
3068 /* The page got truncated from under us */
3071 ext4_journal_stop(handle
);
3074 /* In case writeback began while the page was unlocked */
3075 wait_for_stable_page(page
);
3077 #ifdef CONFIG_EXT4_FS_ENCRYPTION
3078 ret
= ext4_block_write_begin(page
, pos
, len
,
3079 ext4_da_get_block_prep
);
3081 ret
= __block_write_begin(page
, pos
, len
, ext4_da_get_block_prep
);
3085 ext4_journal_stop(handle
);
3087 * block_write_begin may have instantiated a few blocks
3088 * outside i_size. Trim these off again. Don't need
3089 * i_size_read because we hold i_mutex.
3091 if (pos
+ len
> inode
->i_size
)
3092 ext4_truncate_failed_write(inode
);
3094 if (ret
== -ENOSPC
&&
3095 ext4_should_retry_alloc(inode
->i_sb
, &retries
))
3107 * Check if we should update i_disksize
3108 * when write to the end of file but not require block allocation
3110 static int ext4_da_should_update_i_disksize(struct page
*page
,
3111 unsigned long offset
)
3113 struct buffer_head
*bh
;
3114 struct inode
*inode
= page
->mapping
->host
;
3118 bh
= page_buffers(page
);
3119 idx
= offset
>> inode
->i_blkbits
;
3121 for (i
= 0; i
< idx
; i
++)
3122 bh
= bh
->b_this_page
;
3124 if (!buffer_mapped(bh
) || (buffer_delay(bh
)) || buffer_unwritten(bh
))
3129 static int ext4_da_write_end(struct file
*file
,
3130 struct address_space
*mapping
,
3131 loff_t pos
, unsigned len
, unsigned copied
,
3132 struct page
*page
, void *fsdata
)
3134 struct inode
*inode
= mapping
->host
;
3136 handle_t
*handle
= ext4_journal_current_handle();
3138 unsigned long start
, end
;
3139 int write_mode
= (int)(unsigned long)fsdata
;
3141 if (write_mode
== FALL_BACK_TO_NONDELALLOC
)
3142 return ext4_write_end(file
, mapping
, pos
,
3143 len
, copied
, page
, fsdata
);
3145 trace_ext4_da_write_end(inode
, pos
, len
, copied
);
3146 start
= pos
& (PAGE_SIZE
- 1);
3147 end
= start
+ copied
- 1;
3150 * generic_write_end() will run mark_inode_dirty() if i_size
3151 * changes. So let's piggyback the i_disksize mark_inode_dirty
3154 new_i_size
= pos
+ copied
;
3155 if (copied
&& new_i_size
> EXT4_I(inode
)->i_disksize
) {
3156 if (ext4_has_inline_data(inode
) ||
3157 ext4_da_should_update_i_disksize(page
, end
)) {
3158 ext4_update_i_disksize(inode
, new_i_size
);
3159 /* We need to mark inode dirty even if
3160 * new_i_size is less that inode->i_size
3161 * bu greater than i_disksize.(hint delalloc)
3163 ext4_mark_inode_dirty(handle
, inode
);
3167 if (write_mode
!= CONVERT_INLINE_DATA
&&
3168 ext4_test_inode_state(inode
, EXT4_STATE_MAY_INLINE_DATA
) &&
3169 ext4_has_inline_data(inode
))
3170 ret2
= ext4_da_write_inline_data_end(inode
, pos
, len
, copied
,
3173 ret2
= generic_write_end(file
, mapping
, pos
, len
, copied
,
3179 ret2
= ext4_journal_stop(handle
);
3183 return ret
? ret
: copied
;
3186 static void ext4_da_invalidatepage(struct page
*page
, unsigned int offset
,
3187 unsigned int length
)
3190 * Drop reserved blocks
3192 BUG_ON(!PageLocked(page
));
3193 if (!page_has_buffers(page
))
3196 ext4_da_page_release_reservation(page
, offset
, length
);
3199 ext4_invalidatepage(page
, offset
, length
);
3205 * Force all delayed allocation blocks to be allocated for a given inode.
3207 int ext4_alloc_da_blocks(struct inode
*inode
)
3209 trace_ext4_alloc_da_blocks(inode
);
3211 if (!EXT4_I(inode
)->i_reserved_data_blocks
)
3215 * We do something simple for now. The filemap_flush() will
3216 * also start triggering a write of the data blocks, which is
3217 * not strictly speaking necessary (and for users of
3218 * laptop_mode, not even desirable). However, to do otherwise
3219 * would require replicating code paths in:
3221 * ext4_writepages() ->
3222 * write_cache_pages() ---> (via passed in callback function)
3223 * __mpage_da_writepage() -->
3224 * mpage_add_bh_to_extent()
3225 * mpage_da_map_blocks()
3227 * The problem is that write_cache_pages(), located in
3228 * mm/page-writeback.c, marks pages clean in preparation for
3229 * doing I/O, which is not desirable if we're not planning on
3232 * We could call write_cache_pages(), and then redirty all of
3233 * the pages by calling redirty_page_for_writepage() but that
3234 * would be ugly in the extreme. So instead we would need to
3235 * replicate parts of the code in the above functions,
3236 * simplifying them because we wouldn't actually intend to
3237 * write out the pages, but rather only collect contiguous
3238 * logical block extents, call the multi-block allocator, and
3239 * then update the buffer heads with the block allocations.
3241 * For now, though, we'll cheat by calling filemap_flush(),
3242 * which will map the blocks, and start the I/O, but not
3243 * actually wait for the I/O to complete.
3245 return filemap_flush(inode
->i_mapping
);
3249 * bmap() is special. It gets used by applications such as lilo and by
3250 * the swapper to find the on-disk block of a specific piece of data.
3252 * Naturally, this is dangerous if the block concerned is still in the
3253 * journal. If somebody makes a swapfile on an ext4 data-journaling
3254 * filesystem and enables swap, then they may get a nasty shock when the
3255 * data getting swapped to that swapfile suddenly gets overwritten by
3256 * the original zero's written out previously to the journal and
3257 * awaiting writeback in the kernel's buffer cache.
3259 * So, if we see any bmap calls here on a modified, data-journaled file,
3260 * take extra steps to flush any blocks which might be in the cache.
3262 static sector_t
ext4_bmap(struct address_space
*mapping
, sector_t block
)
3264 struct inode
*inode
= mapping
->host
;
3269 * We can get here for an inline file via the FIBMAP ioctl
3271 if (ext4_has_inline_data(inode
))
3274 if (mapping_tagged(mapping
, PAGECACHE_TAG_DIRTY
) &&
3275 test_opt(inode
->i_sb
, DELALLOC
)) {
3277 * With delalloc we want to sync the file
3278 * so that we can make sure we allocate
3281 filemap_write_and_wait(mapping
);
3284 if (EXT4_JOURNAL(inode
) &&
3285 ext4_test_inode_state(inode
, EXT4_STATE_JDATA
)) {
3287 * This is a REALLY heavyweight approach, but the use of
3288 * bmap on dirty files is expected to be extremely rare:
3289 * only if we run lilo or swapon on a freshly made file
3290 * do we expect this to happen.
3292 * (bmap requires CAP_SYS_RAWIO so this does not
3293 * represent an unprivileged user DOS attack --- we'd be
3294 * in trouble if mortal users could trigger this path at
3297 * NB. EXT4_STATE_JDATA is not set on files other than
3298 * regular files. If somebody wants to bmap a directory
3299 * or symlink and gets confused because the buffer
3300 * hasn't yet been flushed to disk, they deserve
3301 * everything they get.
3304 ext4_clear_inode_state(inode
, EXT4_STATE_JDATA
);
3305 journal
= EXT4_JOURNAL(inode
);
3306 jbd2_journal_lock_updates(journal
);
3307 err
= jbd2_journal_flush(journal
);
3308 jbd2_journal_unlock_updates(journal
);
3314 return generic_block_bmap(mapping
, block
, ext4_get_block
);
3317 static int ext4_readpage(struct file
*file
, struct page
*page
)
3320 struct inode
*inode
= page
->mapping
->host
;
3322 trace_ext4_readpage(page
);
3324 if (ext4_has_inline_data(inode
))
3325 ret
= ext4_readpage_inline(inode
, page
);
3328 return ext4_mpage_readpages(page
->mapping
, NULL
, page
, 1);
3334 ext4_readpages(struct file
*file
, struct address_space
*mapping
,
3335 struct list_head
*pages
, unsigned nr_pages
)
3337 struct inode
*inode
= mapping
->host
;
3339 /* If the file has inline data, no need to do readpages. */
3340 if (ext4_has_inline_data(inode
))
3343 return ext4_mpage_readpages(mapping
, pages
, NULL
, nr_pages
);
3346 static void ext4_invalidatepage(struct page
*page
, unsigned int offset
,
3347 unsigned int length
)
3349 trace_ext4_invalidatepage(page
, offset
, length
);
3351 /* No journalling happens on data buffers when this function is used */
3352 WARN_ON(page_has_buffers(page
) && buffer_jbd(page_buffers(page
)));
3354 block_invalidatepage(page
, offset
, length
);
3357 static int __ext4_journalled_invalidatepage(struct page
*page
,
3358 unsigned int offset
,
3359 unsigned int length
)
3361 journal_t
*journal
= EXT4_JOURNAL(page
->mapping
->host
);
3363 trace_ext4_journalled_invalidatepage(page
, offset
, length
);
3366 * If it's a full truncate we just forget about the pending dirtying
3368 if (offset
== 0 && length
== PAGE_SIZE
)
3369 ClearPageChecked(page
);
3371 return jbd2_journal_invalidatepage(journal
, page
, offset
, length
);
3374 /* Wrapper for aops... */
3375 static void ext4_journalled_invalidatepage(struct page
*page
,
3376 unsigned int offset
,
3377 unsigned int length
)
3379 WARN_ON(__ext4_journalled_invalidatepage(page
, offset
, length
) < 0);
3382 static int ext4_releasepage(struct page
*page
, gfp_t wait
)
3384 journal_t
*journal
= EXT4_JOURNAL(page
->mapping
->host
);
3386 trace_ext4_releasepage(page
);
3388 /* Page has dirty journalled data -> cannot release */
3389 if (PageChecked(page
))
3392 return jbd2_journal_try_to_free_buffers(journal
, page
, wait
);
3394 return try_to_free_buffers(page
);
3397 static int ext4_iomap_begin(struct inode
*inode
, loff_t offset
, loff_t length
,
3398 unsigned flags
, struct iomap
*iomap
)
3400 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
3401 unsigned int blkbits
= inode
->i_blkbits
;
3402 unsigned long first_block
= offset
>> blkbits
;
3403 unsigned long last_block
= (offset
+ length
- 1) >> blkbits
;
3404 struct ext4_map_blocks map
;
3405 bool delalloc
= false;
3409 if (flags
& IOMAP_REPORT
) {
3410 if (ext4_has_inline_data(inode
)) {
3411 ret
= ext4_inline_data_iomap(inode
, iomap
);
3412 if (ret
!= -EAGAIN
) {
3413 if (ret
== 0 && offset
>= iomap
->length
)
3419 if (WARN_ON_ONCE(ext4_has_inline_data(inode
)))
3423 map
.m_lblk
= first_block
;
3424 map
.m_len
= last_block
- first_block
+ 1;
3426 if (flags
& IOMAP_REPORT
) {
3427 ret
= ext4_map_blocks(NULL
, inode
, &map
, 0);
3432 ext4_lblk_t end
= map
.m_lblk
+ map
.m_len
- 1;
3433 struct extent_status es
;
3435 ext4_es_find_delayed_extent_range(inode
, map
.m_lblk
, end
, &es
);
3437 if (!es
.es_len
|| es
.es_lblk
> end
) {
3438 /* entire range is a hole */
3439 } else if (es
.es_lblk
> map
.m_lblk
) {
3440 /* range starts with a hole */
3441 map
.m_len
= es
.es_lblk
- map
.m_lblk
;
3443 ext4_lblk_t offs
= 0;
3445 if (es
.es_lblk
< map
.m_lblk
)
3446 offs
= map
.m_lblk
- es
.es_lblk
;
3447 map
.m_lblk
= es
.es_lblk
+ offs
;
3448 map
.m_len
= es
.es_len
- offs
;
3452 } else if (flags
& IOMAP_WRITE
) {
3457 /* Trim mapping request to maximum we can map at once for DIO */
3458 if (map
.m_len
> DIO_MAX_BLOCKS
)
3459 map
.m_len
= DIO_MAX_BLOCKS
;
3460 dio_credits
= ext4_chunk_trans_blocks(inode
, map
.m_len
);
3463 * Either we allocate blocks and then we don't get unwritten
3464 * extent so we have reserved enough credits, or the blocks
3465 * are already allocated and unwritten and in that case
3466 * extent conversion fits in the credits as well.
3468 handle
= ext4_journal_start(inode
, EXT4_HT_MAP_BLOCKS
,
3471 return PTR_ERR(handle
);
3473 ret
= ext4_map_blocks(handle
, inode
, &map
,
3474 EXT4_GET_BLOCKS_CREATE_ZERO
);
3476 ext4_journal_stop(handle
);
3477 if (ret
== -ENOSPC
&&
3478 ext4_should_retry_alloc(inode
->i_sb
, &retries
))
3484 * If we added blocks beyond i_size, we need to make sure they
3485 * will get truncated if we crash before updating i_size in
3486 * ext4_iomap_end(). For faults we don't need to do that (and
3487 * even cannot because for orphan list operations inode_lock is
3488 * required) - if we happen to instantiate block beyond i_size,
3489 * it is because we race with truncate which has already added
3490 * the inode to the orphan list.
3492 if (!(flags
& IOMAP_FAULT
) && first_block
+ map
.m_len
>
3493 (i_size_read(inode
) + (1 << blkbits
) - 1) >> blkbits
) {
3496 err
= ext4_orphan_add(handle
, inode
);
3498 ext4_journal_stop(handle
);
3502 ext4_journal_stop(handle
);
3504 ret
= ext4_map_blocks(NULL
, inode
, &map
, 0);
3510 iomap
->bdev
= inode
->i_sb
->s_bdev
;
3511 iomap
->dax_dev
= sbi
->s_daxdev
;
3512 iomap
->offset
= first_block
<< blkbits
;
3513 iomap
->length
= (u64
)map
.m_len
<< blkbits
;
3516 iomap
->type
= delalloc
? IOMAP_DELALLOC
: IOMAP_HOLE
;
3517 iomap
->addr
= IOMAP_NULL_ADDR
;
3519 if (map
.m_flags
& EXT4_MAP_MAPPED
) {
3520 iomap
->type
= IOMAP_MAPPED
;
3521 } else if (map
.m_flags
& EXT4_MAP_UNWRITTEN
) {
3522 iomap
->type
= IOMAP_UNWRITTEN
;
3527 iomap
->addr
= (u64
)map
.m_pblk
<< blkbits
;
3530 if (map
.m_flags
& EXT4_MAP_NEW
)
3531 iomap
->flags
|= IOMAP_F_NEW
;
3536 static int ext4_iomap_end(struct inode
*inode
, loff_t offset
, loff_t length
,
3537 ssize_t written
, unsigned flags
, struct iomap
*iomap
)
3541 int blkbits
= inode
->i_blkbits
;
3542 bool truncate
= false;
3544 if (!(flags
& IOMAP_WRITE
) || (flags
& IOMAP_FAULT
))
3547 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 2);
3548 if (IS_ERR(handle
)) {
3549 ret
= PTR_ERR(handle
);
3552 if (ext4_update_inode_size(inode
, offset
+ written
))
3553 ext4_mark_inode_dirty(handle
, inode
);
3555 * We may need to truncate allocated but not written blocks beyond EOF.
3557 if (iomap
->offset
+ iomap
->length
>
3558 ALIGN(inode
->i_size
, 1 << blkbits
)) {
3559 ext4_lblk_t written_blk
, end_blk
;
3561 written_blk
= (offset
+ written
) >> blkbits
;
3562 end_blk
= (offset
+ length
) >> blkbits
;
3563 if (written_blk
< end_blk
&& ext4_can_truncate(inode
))
3567 * Remove inode from orphan list if we were extending a inode and
3568 * everything went fine.
3570 if (!truncate
&& inode
->i_nlink
&&
3571 !list_empty(&EXT4_I(inode
)->i_orphan
))
3572 ext4_orphan_del(handle
, inode
);
3573 ext4_journal_stop(handle
);
3575 ext4_truncate_failed_write(inode
);
3578 * If truncate failed early the inode might still be on the
3579 * orphan list; we need to make sure the inode is removed from
3580 * the orphan list in that case.
3583 ext4_orphan_del(NULL
, inode
);
3588 const struct iomap_ops ext4_iomap_ops
= {
3589 .iomap_begin
= ext4_iomap_begin
,
3590 .iomap_end
= ext4_iomap_end
,
3593 static int ext4_end_io_dio(struct kiocb
*iocb
, loff_t offset
,
3594 ssize_t size
, void *private)
3596 ext4_io_end_t
*io_end
= private;
3598 /* if not async direct IO just return */
3602 ext_debug("ext4_end_io_dio(): io_end 0x%p "
3603 "for inode %lu, iocb 0x%p, offset %llu, size %zd\n",
3604 io_end
, io_end
->inode
->i_ino
, iocb
, offset
, size
);
3607 * Error during AIO DIO. We cannot convert unwritten extents as the
3608 * data was not written. Just clear the unwritten flag and drop io_end.
3611 ext4_clear_io_unwritten_flag(io_end
);
3614 io_end
->offset
= offset
;
3615 io_end
->size
= size
;
3616 ext4_put_io_end(io_end
);
3622 * Handling of direct IO writes.
3624 * For ext4 extent files, ext4 will do direct-io write even to holes,
3625 * preallocated extents, and those write extend the file, no need to
3626 * fall back to buffered IO.
3628 * For holes, we fallocate those blocks, mark them as unwritten
3629 * If those blocks were preallocated, we mark sure they are split, but
3630 * still keep the range to write as unwritten.
3632 * The unwritten extents will be converted to written when DIO is completed.
3633 * For async direct IO, since the IO may still pending when return, we
3634 * set up an end_io call back function, which will do the conversion
3635 * when async direct IO completed.
3637 * If the O_DIRECT write will extend the file then add this inode to the
3638 * orphan list. So recovery will truncate it back to the original size
3639 * if the machine crashes during the write.
3642 static ssize_t
ext4_direct_IO_write(struct kiocb
*iocb
, struct iov_iter
*iter
)
3644 struct file
*file
= iocb
->ki_filp
;
3645 struct inode
*inode
= file
->f_mapping
->host
;
3646 struct ext4_inode_info
*ei
= EXT4_I(inode
);
3648 loff_t offset
= iocb
->ki_pos
;
3649 size_t count
= iov_iter_count(iter
);
3651 get_block_t
*get_block_func
= NULL
;
3653 loff_t final_size
= offset
+ count
;
3657 if (final_size
> inode
->i_size
) {
3658 /* Credits for sb + inode write */
3659 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 2);
3660 if (IS_ERR(handle
)) {
3661 ret
= PTR_ERR(handle
);
3664 ret
= ext4_orphan_add(handle
, inode
);
3666 ext4_journal_stop(handle
);
3670 ei
->i_disksize
= inode
->i_size
;
3671 ext4_journal_stop(handle
);
3674 BUG_ON(iocb
->private == NULL
);
3677 * Make all waiters for direct IO properly wait also for extent
3678 * conversion. This also disallows race between truncate() and
3679 * overwrite DIO as i_dio_count needs to be incremented under i_mutex.
3681 inode_dio_begin(inode
);
3683 /* If we do a overwrite dio, i_mutex locking can be released */
3684 overwrite
= *((int *)iocb
->private);
3687 inode_unlock(inode
);
3690 * For extent mapped files we could direct write to holes and fallocate.
3692 * Allocated blocks to fill the hole are marked as unwritten to prevent
3693 * parallel buffered read to expose the stale data before DIO complete
3696 * As to previously fallocated extents, ext4 get_block will just simply
3697 * mark the buffer mapped but still keep the extents unwritten.
3699 * For non AIO case, we will convert those unwritten extents to written
3700 * after return back from blockdev_direct_IO. That way we save us from
3701 * allocating io_end structure and also the overhead of offloading
3702 * the extent convertion to a workqueue.
3704 * For async DIO, the conversion needs to be deferred when the
3705 * IO is completed. The ext4 end_io callback function will be
3706 * called to take care of the conversion work. Here for async
3707 * case, we allocate an io_end structure to hook to the iocb.
3709 iocb
->private = NULL
;
3711 get_block_func
= ext4_dio_get_block_overwrite
;
3712 else if (!ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
) ||
3713 round_down(offset
, i_blocksize(inode
)) >= inode
->i_size
) {
3714 get_block_func
= ext4_dio_get_block
;
3715 dio_flags
= DIO_LOCKING
| DIO_SKIP_HOLES
;
3716 } else if (is_sync_kiocb(iocb
)) {
3717 get_block_func
= ext4_dio_get_block_unwritten_sync
;
3718 dio_flags
= DIO_LOCKING
;
3720 get_block_func
= ext4_dio_get_block_unwritten_async
;
3721 dio_flags
= DIO_LOCKING
;
3723 ret
= __blockdev_direct_IO(iocb
, inode
, inode
->i_sb
->s_bdev
, iter
,
3724 get_block_func
, ext4_end_io_dio
, NULL
,
3727 if (ret
> 0 && !overwrite
&& ext4_test_inode_state(inode
,
3728 EXT4_STATE_DIO_UNWRITTEN
)) {
3731 * for non AIO case, since the IO is already
3732 * completed, we could do the conversion right here
3734 err
= ext4_convert_unwritten_extents(NULL
, inode
,
3738 ext4_clear_inode_state(inode
, EXT4_STATE_DIO_UNWRITTEN
);
3741 inode_dio_end(inode
);
3742 /* take i_mutex locking again if we do a ovewrite dio */
3746 if (ret
< 0 && final_size
> inode
->i_size
)
3747 ext4_truncate_failed_write(inode
);
3749 /* Handle extending of i_size after direct IO write */
3753 /* Credits for sb + inode write */
3754 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 2);
3755 if (IS_ERR(handle
)) {
3756 /* This is really bad luck. We've written the data
3757 * but cannot extend i_size. Bail out and pretend
3758 * the write failed... */
3759 ret
= PTR_ERR(handle
);
3761 ext4_orphan_del(NULL
, inode
);
3766 ext4_orphan_del(handle
, inode
);
3768 loff_t end
= offset
+ ret
;
3769 if (end
> inode
->i_size
) {
3770 ei
->i_disksize
= end
;
3771 i_size_write(inode
, end
);
3773 * We're going to return a positive `ret'
3774 * here due to non-zero-length I/O, so there's
3775 * no way of reporting error returns from
3776 * ext4_mark_inode_dirty() to userspace. So
3779 ext4_mark_inode_dirty(handle
, inode
);
3782 err
= ext4_journal_stop(handle
);
3790 static ssize_t
ext4_direct_IO_read(struct kiocb
*iocb
, struct iov_iter
*iter
)
3792 struct address_space
*mapping
= iocb
->ki_filp
->f_mapping
;
3793 struct inode
*inode
= mapping
->host
;
3794 size_t count
= iov_iter_count(iter
);
3798 * Shared inode_lock is enough for us - it protects against concurrent
3799 * writes & truncates and since we take care of writing back page cache,
3800 * we are protected against page writeback as well.
3802 inode_lock_shared(inode
);
3803 ret
= filemap_write_and_wait_range(mapping
, iocb
->ki_pos
,
3804 iocb
->ki_pos
+ count
- 1);
3807 ret
= __blockdev_direct_IO(iocb
, inode
, inode
->i_sb
->s_bdev
,
3808 iter
, ext4_dio_get_block
, NULL
, NULL
, 0);
3810 inode_unlock_shared(inode
);
3814 static ssize_t
ext4_direct_IO(struct kiocb
*iocb
, struct iov_iter
*iter
)
3816 struct file
*file
= iocb
->ki_filp
;
3817 struct inode
*inode
= file
->f_mapping
->host
;
3818 size_t count
= iov_iter_count(iter
);
3819 loff_t offset
= iocb
->ki_pos
;
3822 #ifdef CONFIG_EXT4_FS_ENCRYPTION
3823 if (ext4_encrypted_inode(inode
) && S_ISREG(inode
->i_mode
))
3828 * If we are doing data journalling we don't support O_DIRECT
3830 if (ext4_should_journal_data(inode
))
3833 /* Let buffer I/O handle the inline data case. */
3834 if (ext4_has_inline_data(inode
))
3837 /* DAX uses iomap path now */
3838 if (WARN_ON_ONCE(IS_DAX(inode
)))
3841 trace_ext4_direct_IO_enter(inode
, offset
, count
, iov_iter_rw(iter
));
3842 if (iov_iter_rw(iter
) == READ
)
3843 ret
= ext4_direct_IO_read(iocb
, iter
);
3845 ret
= ext4_direct_IO_write(iocb
, iter
);
3846 trace_ext4_direct_IO_exit(inode
, offset
, count
, iov_iter_rw(iter
), ret
);
3851 * Pages can be marked dirty completely asynchronously from ext4's journalling
3852 * activity. By filemap_sync_pte(), try_to_unmap_one(), etc. We cannot do
3853 * much here because ->set_page_dirty is called under VFS locks. The page is
3854 * not necessarily locked.
3856 * We cannot just dirty the page and leave attached buffers clean, because the
3857 * buffers' dirty state is "definitive". We cannot just set the buffers dirty
3858 * or jbddirty because all the journalling code will explode.
3860 * So what we do is to mark the page "pending dirty" and next time writepage
3861 * is called, propagate that into the buffers appropriately.
3863 static int ext4_journalled_set_page_dirty(struct page
*page
)
3865 SetPageChecked(page
);
3866 return __set_page_dirty_nobuffers(page
);
3869 static int ext4_set_page_dirty(struct page
*page
)
3871 WARN_ON_ONCE(!PageLocked(page
) && !PageDirty(page
));
3872 WARN_ON_ONCE(!page_has_buffers(page
));
3873 return __set_page_dirty_buffers(page
);
3876 static const struct address_space_operations ext4_aops
= {
3877 .readpage
= ext4_readpage
,
3878 .readpages
= ext4_readpages
,
3879 .writepage
= ext4_writepage
,
3880 .writepages
= ext4_writepages
,
3881 .write_begin
= ext4_write_begin
,
3882 .write_end
= ext4_write_end
,
3883 .set_page_dirty
= ext4_set_page_dirty
,
3885 .invalidatepage
= ext4_invalidatepage
,
3886 .releasepage
= ext4_releasepage
,
3887 .direct_IO
= ext4_direct_IO
,
3888 .migratepage
= buffer_migrate_page
,
3889 .is_partially_uptodate
= block_is_partially_uptodate
,
3890 .error_remove_page
= generic_error_remove_page
,
3893 static const struct address_space_operations ext4_journalled_aops
= {
3894 .readpage
= ext4_readpage
,
3895 .readpages
= ext4_readpages
,
3896 .writepage
= ext4_writepage
,
3897 .writepages
= ext4_writepages
,
3898 .write_begin
= ext4_write_begin
,
3899 .write_end
= ext4_journalled_write_end
,
3900 .set_page_dirty
= ext4_journalled_set_page_dirty
,
3902 .invalidatepage
= ext4_journalled_invalidatepage
,
3903 .releasepage
= ext4_releasepage
,
3904 .direct_IO
= ext4_direct_IO
,
3905 .is_partially_uptodate
= block_is_partially_uptodate
,
3906 .error_remove_page
= generic_error_remove_page
,
3909 static const struct address_space_operations ext4_da_aops
= {
3910 .readpage
= ext4_readpage
,
3911 .readpages
= ext4_readpages
,
3912 .writepage
= ext4_writepage
,
3913 .writepages
= ext4_writepages
,
3914 .write_begin
= ext4_da_write_begin
,
3915 .write_end
= ext4_da_write_end
,
3916 .set_page_dirty
= ext4_set_page_dirty
,
3918 .invalidatepage
= ext4_da_invalidatepage
,
3919 .releasepage
= ext4_releasepage
,
3920 .direct_IO
= ext4_direct_IO
,
3921 .migratepage
= buffer_migrate_page
,
3922 .is_partially_uptodate
= block_is_partially_uptodate
,
3923 .error_remove_page
= generic_error_remove_page
,
3926 void ext4_set_aops(struct inode
*inode
)
3928 switch (ext4_inode_journal_mode(inode
)) {
3929 case EXT4_INODE_ORDERED_DATA_MODE
:
3930 case EXT4_INODE_WRITEBACK_DATA_MODE
:
3932 case EXT4_INODE_JOURNAL_DATA_MODE
:
3933 inode
->i_mapping
->a_ops
= &ext4_journalled_aops
;
3938 if (test_opt(inode
->i_sb
, DELALLOC
))
3939 inode
->i_mapping
->a_ops
= &ext4_da_aops
;
3941 inode
->i_mapping
->a_ops
= &ext4_aops
;
3944 static int __ext4_block_zero_page_range(handle_t
*handle
,
3945 struct address_space
*mapping
, loff_t from
, loff_t length
)
3947 ext4_fsblk_t index
= from
>> PAGE_SHIFT
;
3948 unsigned offset
= from
& (PAGE_SIZE
-1);
3949 unsigned blocksize
, pos
;
3951 struct inode
*inode
= mapping
->host
;
3952 struct buffer_head
*bh
;
3956 page
= find_or_create_page(mapping
, from
>> PAGE_SHIFT
,
3957 mapping_gfp_constraint(mapping
, ~__GFP_FS
));
3961 blocksize
= inode
->i_sb
->s_blocksize
;
3963 iblock
= index
<< (PAGE_SHIFT
- inode
->i_sb
->s_blocksize_bits
);
3965 if (!page_has_buffers(page
))
3966 create_empty_buffers(page
, blocksize
, 0);
3968 /* Find the buffer that contains "offset" */
3969 bh
= page_buffers(page
);
3971 while (offset
>= pos
) {
3972 bh
= bh
->b_this_page
;
3976 if (buffer_freed(bh
)) {
3977 BUFFER_TRACE(bh
, "freed: skip");
3980 if (!buffer_mapped(bh
)) {
3981 BUFFER_TRACE(bh
, "unmapped");
3982 ext4_get_block(inode
, iblock
, bh
, 0);
3983 /* unmapped? It's a hole - nothing to do */
3984 if (!buffer_mapped(bh
)) {
3985 BUFFER_TRACE(bh
, "still unmapped");
3990 /* Ok, it's mapped. Make sure it's up-to-date */
3991 if (PageUptodate(page
))
3992 set_buffer_uptodate(bh
);
3994 if (!buffer_uptodate(bh
)) {
3996 ll_rw_block(REQ_OP_READ
, 0, 1, &bh
);
3998 /* Uhhuh. Read error. Complain and punt. */
3999 if (!buffer_uptodate(bh
))
4001 if (S_ISREG(inode
->i_mode
) &&
4002 ext4_encrypted_inode(inode
)) {
4003 /* We expect the key to be set. */
4004 BUG_ON(!fscrypt_has_encryption_key(inode
));
4005 BUG_ON(blocksize
!= PAGE_SIZE
);
4006 WARN_ON_ONCE(fscrypt_decrypt_page(page
->mapping
->host
,
4007 page
, PAGE_SIZE
, 0, page
->index
));
4010 if (ext4_should_journal_data(inode
)) {
4011 BUFFER_TRACE(bh
, "get write access");
4012 err
= ext4_journal_get_write_access(handle
, bh
);
4016 zero_user(page
, offset
, length
);
4017 BUFFER_TRACE(bh
, "zeroed end of block");
4019 if (ext4_should_journal_data(inode
)) {
4020 err
= ext4_handle_dirty_metadata(handle
, inode
, bh
);
4023 mark_buffer_dirty(bh
);
4024 if (ext4_should_order_data(inode
))
4025 err
= ext4_jbd2_inode_add_write(handle
, inode
);
4035 * ext4_block_zero_page_range() zeros out a mapping of length 'length'
4036 * starting from file offset 'from'. The range to be zero'd must
4037 * be contained with in one block. If the specified range exceeds
4038 * the end of the block it will be shortened to end of the block
4039 * that cooresponds to 'from'
4041 static int ext4_block_zero_page_range(handle_t
*handle
,
4042 struct address_space
*mapping
, loff_t from
, loff_t length
)
4044 struct inode
*inode
= mapping
->host
;
4045 unsigned offset
= from
& (PAGE_SIZE
-1);
4046 unsigned blocksize
= inode
->i_sb
->s_blocksize
;
4047 unsigned max
= blocksize
- (offset
& (blocksize
- 1));
4050 * correct length if it does not fall between
4051 * 'from' and the end of the block
4053 if (length
> max
|| length
< 0)
4056 if (IS_DAX(inode
)) {
4057 return iomap_zero_range(inode
, from
, length
, NULL
,
4060 return __ext4_block_zero_page_range(handle
, mapping
, from
, length
);
4064 * ext4_block_truncate_page() zeroes out a mapping from file offset `from'
4065 * up to the end of the block which corresponds to `from'.
4066 * This required during truncate. We need to physically zero the tail end
4067 * of that block so it doesn't yield old data if the file is later grown.
4069 static int ext4_block_truncate_page(handle_t
*handle
,
4070 struct address_space
*mapping
, loff_t from
)
4072 unsigned offset
= from
& (PAGE_SIZE
-1);
4075 struct inode
*inode
= mapping
->host
;
4077 /* If we are processing an encrypted inode during orphan list handling */
4078 if (ext4_encrypted_inode(inode
) && !fscrypt_has_encryption_key(inode
))
4081 blocksize
= inode
->i_sb
->s_blocksize
;
4082 length
= blocksize
- (offset
& (blocksize
- 1));
4084 return ext4_block_zero_page_range(handle
, mapping
, from
, length
);
4087 int ext4_zero_partial_blocks(handle_t
*handle
, struct inode
*inode
,
4088 loff_t lstart
, loff_t length
)
4090 struct super_block
*sb
= inode
->i_sb
;
4091 struct address_space
*mapping
= inode
->i_mapping
;
4092 unsigned partial_start
, partial_end
;
4093 ext4_fsblk_t start
, end
;
4094 loff_t byte_end
= (lstart
+ length
- 1);
4097 partial_start
= lstart
& (sb
->s_blocksize
- 1);
4098 partial_end
= byte_end
& (sb
->s_blocksize
- 1);
4100 start
= lstart
>> sb
->s_blocksize_bits
;
4101 end
= byte_end
>> sb
->s_blocksize_bits
;
4103 /* Handle partial zero within the single block */
4105 (partial_start
|| (partial_end
!= sb
->s_blocksize
- 1))) {
4106 err
= ext4_block_zero_page_range(handle
, mapping
,
4110 /* Handle partial zero out on the start of the range */
4111 if (partial_start
) {
4112 err
= ext4_block_zero_page_range(handle
, mapping
,
4113 lstart
, sb
->s_blocksize
);
4117 /* Handle partial zero out on the end of the range */
4118 if (partial_end
!= sb
->s_blocksize
- 1)
4119 err
= ext4_block_zero_page_range(handle
, mapping
,
4120 byte_end
- partial_end
,
4125 int ext4_can_truncate(struct inode
*inode
)
4127 if (S_ISREG(inode
->i_mode
))
4129 if (S_ISDIR(inode
->i_mode
))
4131 if (S_ISLNK(inode
->i_mode
))
4132 return !ext4_inode_is_fast_symlink(inode
);
4137 * We have to make sure i_disksize gets properly updated before we truncate
4138 * page cache due to hole punching or zero range. Otherwise i_disksize update
4139 * can get lost as it may have been postponed to submission of writeback but
4140 * that will never happen after we truncate page cache.
4142 int ext4_update_disksize_before_punch(struct inode
*inode
, loff_t offset
,
4146 loff_t size
= i_size_read(inode
);
4148 WARN_ON(!inode_is_locked(inode
));
4149 if (offset
> size
|| offset
+ len
< size
)
4152 if (EXT4_I(inode
)->i_disksize
>= size
)
4155 handle
= ext4_journal_start(inode
, EXT4_HT_MISC
, 1);
4157 return PTR_ERR(handle
);
4158 ext4_update_i_disksize(inode
, size
);
4159 ext4_mark_inode_dirty(handle
, inode
);
4160 ext4_journal_stop(handle
);
4166 * ext4_punch_hole: punches a hole in a file by releasing the blocks
4167 * associated with the given offset and length
4169 * @inode: File inode
4170 * @offset: The offset where the hole will begin
4171 * @len: The length of the hole
4173 * Returns: 0 on success or negative on failure
4176 int ext4_punch_hole(struct inode
*inode
, loff_t offset
, loff_t length
)
4178 struct super_block
*sb
= inode
->i_sb
;
4179 ext4_lblk_t first_block
, stop_block
;
4180 struct address_space
*mapping
= inode
->i_mapping
;
4181 loff_t first_block_offset
, last_block_offset
;
4183 unsigned int credits
;
4186 if (!S_ISREG(inode
->i_mode
))
4189 trace_ext4_punch_hole(inode
, offset
, length
, 0);
4192 * Write out all dirty pages to avoid race conditions
4193 * Then release them.
4195 if (mapping_tagged(mapping
, PAGECACHE_TAG_DIRTY
)) {
4196 ret
= filemap_write_and_wait_range(mapping
, offset
,
4197 offset
+ length
- 1);
4204 /* No need to punch hole beyond i_size */
4205 if (offset
>= inode
->i_size
)
4209 * If the hole extends beyond i_size, set the hole
4210 * to end after the page that contains i_size
4212 if (offset
+ length
> inode
->i_size
) {
4213 length
= inode
->i_size
+
4214 PAGE_SIZE
- (inode
->i_size
& (PAGE_SIZE
- 1)) -
4218 if (offset
& (sb
->s_blocksize
- 1) ||
4219 (offset
+ length
) & (sb
->s_blocksize
- 1)) {
4221 * Attach jinode to inode for jbd2 if we do any zeroing of
4224 ret
= ext4_inode_attach_jinode(inode
);
4230 /* Wait all existing dio workers, newcomers will block on i_mutex */
4231 ext4_inode_block_unlocked_dio(inode
);
4232 inode_dio_wait(inode
);
4235 * Prevent page faults from reinstantiating pages we have released from
4238 down_write(&EXT4_I(inode
)->i_mmap_sem
);
4239 first_block_offset
= round_up(offset
, sb
->s_blocksize
);
4240 last_block_offset
= round_down((offset
+ length
), sb
->s_blocksize
) - 1;
4242 /* Now release the pages and zero block aligned part of pages*/
4243 if (last_block_offset
> first_block_offset
) {
4244 ret
= ext4_update_disksize_before_punch(inode
, offset
, length
);
4247 truncate_pagecache_range(inode
, first_block_offset
,
4251 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))
4252 credits
= ext4_writepage_trans_blocks(inode
);
4254 credits
= ext4_blocks_for_truncate(inode
);
4255 handle
= ext4_journal_start(inode
, EXT4_HT_TRUNCATE
, credits
);
4256 if (IS_ERR(handle
)) {
4257 ret
= PTR_ERR(handle
);
4258 ext4_std_error(sb
, ret
);
4262 ret
= ext4_zero_partial_blocks(handle
, inode
, offset
,
4267 first_block
= (offset
+ sb
->s_blocksize
- 1) >>
4268 EXT4_BLOCK_SIZE_BITS(sb
);
4269 stop_block
= (offset
+ length
) >> EXT4_BLOCK_SIZE_BITS(sb
);
4271 /* If there are no blocks to remove, return now */
4272 if (first_block
>= stop_block
)
4275 down_write(&EXT4_I(inode
)->i_data_sem
);
4276 ext4_discard_preallocations(inode
);
4278 ret
= ext4_es_remove_extent(inode
, first_block
,
4279 stop_block
- first_block
);
4281 up_write(&EXT4_I(inode
)->i_data_sem
);
4285 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))
4286 ret
= ext4_ext_remove_space(inode
, first_block
,
4289 ret
= ext4_ind_remove_space(handle
, inode
, first_block
,
4292 up_write(&EXT4_I(inode
)->i_data_sem
);
4294 ext4_handle_sync(handle
);
4296 inode
->i_mtime
= inode
->i_ctime
= current_time(inode
);
4297 ext4_mark_inode_dirty(handle
, inode
);
4299 ext4_update_inode_fsync_trans(handle
, inode
, 1);
4301 ext4_journal_stop(handle
);
4303 up_write(&EXT4_I(inode
)->i_mmap_sem
);
4304 ext4_inode_resume_unlocked_dio(inode
);
4306 inode_unlock(inode
);
4310 int ext4_inode_attach_jinode(struct inode
*inode
)
4312 struct ext4_inode_info
*ei
= EXT4_I(inode
);
4313 struct jbd2_inode
*jinode
;
4315 if (ei
->jinode
|| !EXT4_SB(inode
->i_sb
)->s_journal
)
4318 jinode
= jbd2_alloc_inode(GFP_KERNEL
);
4319 spin_lock(&inode
->i_lock
);
4322 spin_unlock(&inode
->i_lock
);
4325 ei
->jinode
= jinode
;
4326 jbd2_journal_init_jbd_inode(ei
->jinode
, inode
);
4329 spin_unlock(&inode
->i_lock
);
4330 if (unlikely(jinode
!= NULL
))
4331 jbd2_free_inode(jinode
);
4338 * We block out ext4_get_block() block instantiations across the entire
4339 * transaction, and VFS/VM ensures that ext4_truncate() cannot run
4340 * simultaneously on behalf of the same inode.
4342 * As we work through the truncate and commit bits of it to the journal there
4343 * is one core, guiding principle: the file's tree must always be consistent on
4344 * disk. We must be able to restart the truncate after a crash.
4346 * The file's tree may be transiently inconsistent in memory (although it
4347 * probably isn't), but whenever we close off and commit a journal transaction,
4348 * the contents of (the filesystem + the journal) must be consistent and
4349 * restartable. It's pretty simple, really: bottom up, right to left (although
4350 * left-to-right works OK too).
4352 * Note that at recovery time, journal replay occurs *before* the restart of
4353 * truncate against the orphan inode list.
4355 * The committed inode has the new, desired i_size (which is the same as
4356 * i_disksize in this case). After a crash, ext4_orphan_cleanup() will see
4357 * that this inode's truncate did not complete and it will again call
4358 * ext4_truncate() to have another go. So there will be instantiated blocks
4359 * to the right of the truncation point in a crashed ext4 filesystem. But
4360 * that's fine - as long as they are linked from the inode, the post-crash
4361 * ext4_truncate() run will find them and release them.
4363 int ext4_truncate(struct inode
*inode
)
4365 struct ext4_inode_info
*ei
= EXT4_I(inode
);
4366 unsigned int credits
;
4369 struct address_space
*mapping
= inode
->i_mapping
;
4372 * There is a possibility that we're either freeing the inode
4373 * or it's a completely new inode. In those cases we might not
4374 * have i_mutex locked because it's not necessary.
4376 if (!(inode
->i_state
& (I_NEW
|I_FREEING
)))
4377 WARN_ON(!inode_is_locked(inode
));
4378 trace_ext4_truncate_enter(inode
);
4380 if (!ext4_can_truncate(inode
))
4383 ext4_clear_inode_flag(inode
, EXT4_INODE_EOFBLOCKS
);
4385 if (inode
->i_size
== 0 && !test_opt(inode
->i_sb
, NO_AUTO_DA_ALLOC
))
4386 ext4_set_inode_state(inode
, EXT4_STATE_DA_ALLOC_CLOSE
);
4388 if (ext4_has_inline_data(inode
)) {
4391 err
= ext4_inline_data_truncate(inode
, &has_inline
);
4398 /* If we zero-out tail of the page, we have to create jinode for jbd2 */
4399 if (inode
->i_size
& (inode
->i_sb
->s_blocksize
- 1)) {
4400 if (ext4_inode_attach_jinode(inode
) < 0)
4404 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))
4405 credits
= ext4_writepage_trans_blocks(inode
);
4407 credits
= ext4_blocks_for_truncate(inode
);
4409 handle
= ext4_journal_start(inode
, EXT4_HT_TRUNCATE
, credits
);
4411 return PTR_ERR(handle
);
4413 if (inode
->i_size
& (inode
->i_sb
->s_blocksize
- 1))
4414 ext4_block_truncate_page(handle
, mapping
, inode
->i_size
);
4417 * We add the inode to the orphan list, so that if this
4418 * truncate spans multiple transactions, and we crash, we will
4419 * resume the truncate when the filesystem recovers. It also
4420 * marks the inode dirty, to catch the new size.
4422 * Implication: the file must always be in a sane, consistent
4423 * truncatable state while each transaction commits.
4425 err
= ext4_orphan_add(handle
, inode
);
4429 down_write(&EXT4_I(inode
)->i_data_sem
);
4431 ext4_discard_preallocations(inode
);
4433 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))
4434 err
= ext4_ext_truncate(handle
, inode
);
4436 ext4_ind_truncate(handle
, inode
);
4438 up_write(&ei
->i_data_sem
);
4443 ext4_handle_sync(handle
);
4447 * If this was a simple ftruncate() and the file will remain alive,
4448 * then we need to clear up the orphan record which we created above.
4449 * However, if this was a real unlink then we were called by
4450 * ext4_evict_inode(), and we allow that function to clean up the
4451 * orphan info for us.
4454 ext4_orphan_del(handle
, inode
);
4456 inode
->i_mtime
= inode
->i_ctime
= current_time(inode
);
4457 ext4_mark_inode_dirty(handle
, inode
);
4458 ext4_journal_stop(handle
);
4460 trace_ext4_truncate_exit(inode
);
4465 * ext4_get_inode_loc returns with an extra refcount against the inode's
4466 * underlying buffer_head on success. If 'in_mem' is true, we have all
4467 * data in memory that is needed to recreate the on-disk version of this
4470 static int __ext4_get_inode_loc(struct inode
*inode
,
4471 struct ext4_iloc
*iloc
, int in_mem
)
4473 struct ext4_group_desc
*gdp
;
4474 struct buffer_head
*bh
;
4475 struct super_block
*sb
= inode
->i_sb
;
4477 int inodes_per_block
, inode_offset
;
4480 if (!ext4_valid_inum(sb
, inode
->i_ino
))
4481 return -EFSCORRUPTED
;
4483 iloc
->block_group
= (inode
->i_ino
- 1) / EXT4_INODES_PER_GROUP(sb
);
4484 gdp
= ext4_get_group_desc(sb
, iloc
->block_group
, NULL
);
4489 * Figure out the offset within the block group inode table
4491 inodes_per_block
= EXT4_SB(sb
)->s_inodes_per_block
;
4492 inode_offset
= ((inode
->i_ino
- 1) %
4493 EXT4_INODES_PER_GROUP(sb
));
4494 block
= ext4_inode_table(sb
, gdp
) + (inode_offset
/ inodes_per_block
);
4495 iloc
->offset
= (inode_offset
% inodes_per_block
) * EXT4_INODE_SIZE(sb
);
4497 bh
= sb_getblk(sb
, block
);
4500 if (!buffer_uptodate(bh
)) {
4504 * If the buffer has the write error flag, we have failed
4505 * to write out another inode in the same block. In this
4506 * case, we don't have to read the block because we may
4507 * read the old inode data successfully.
4509 if (buffer_write_io_error(bh
) && !buffer_uptodate(bh
))
4510 set_buffer_uptodate(bh
);
4512 if (buffer_uptodate(bh
)) {
4513 /* someone brought it uptodate while we waited */
4519 * If we have all information of the inode in memory and this
4520 * is the only valid inode in the block, we need not read the
4524 struct buffer_head
*bitmap_bh
;
4527 start
= inode_offset
& ~(inodes_per_block
- 1);
4529 /* Is the inode bitmap in cache? */
4530 bitmap_bh
= sb_getblk(sb
, ext4_inode_bitmap(sb
, gdp
));
4531 if (unlikely(!bitmap_bh
))
4535 * If the inode bitmap isn't in cache then the
4536 * optimisation may end up performing two reads instead
4537 * of one, so skip it.
4539 if (!buffer_uptodate(bitmap_bh
)) {
4543 for (i
= start
; i
< start
+ inodes_per_block
; i
++) {
4544 if (i
== inode_offset
)
4546 if (ext4_test_bit(i
, bitmap_bh
->b_data
))
4550 if (i
== start
+ inodes_per_block
) {
4551 /* all other inodes are free, so skip I/O */
4552 memset(bh
->b_data
, 0, bh
->b_size
);
4553 set_buffer_uptodate(bh
);
4561 * If we need to do any I/O, try to pre-readahead extra
4562 * blocks from the inode table.
4564 if (EXT4_SB(sb
)->s_inode_readahead_blks
) {
4565 ext4_fsblk_t b
, end
, table
;
4567 __u32 ra_blks
= EXT4_SB(sb
)->s_inode_readahead_blks
;
4569 table
= ext4_inode_table(sb
, gdp
);
4570 /* s_inode_readahead_blks is always a power of 2 */
4571 b
= block
& ~((ext4_fsblk_t
) ra_blks
- 1);
4575 num
= EXT4_INODES_PER_GROUP(sb
);
4576 if (ext4_has_group_desc_csum(sb
))
4577 num
-= ext4_itable_unused_count(sb
, gdp
);
4578 table
+= num
/ inodes_per_block
;
4582 sb_breadahead(sb
, b
++);
4586 * There are other valid inodes in the buffer, this inode
4587 * has in-inode xattrs, or we don't have this inode in memory.
4588 * Read the block from disk.
4590 trace_ext4_load_inode(inode
);
4592 bh
->b_end_io
= end_buffer_read_sync
;
4593 submit_bh(REQ_OP_READ
, REQ_META
| REQ_PRIO
, bh
);
4595 if (!buffer_uptodate(bh
)) {
4596 EXT4_ERROR_INODE_BLOCK(inode
, block
,
4597 "unable to read itable block");
4607 int ext4_get_inode_loc(struct inode
*inode
, struct ext4_iloc
*iloc
)
4609 /* We have all inode data except xattrs in memory here. */
4610 return __ext4_get_inode_loc(inode
, iloc
,
4611 !ext4_test_inode_state(inode
, EXT4_STATE_XATTR
));
4614 static bool ext4_should_use_dax(struct inode
*inode
)
4616 if (!test_opt(inode
->i_sb
, DAX
))
4618 if (!S_ISREG(inode
->i_mode
))
4620 if (ext4_should_journal_data(inode
))
4622 if (ext4_has_inline_data(inode
))
4624 if (ext4_encrypted_inode(inode
))
4629 void ext4_set_inode_flags(struct inode
*inode
)
4631 unsigned int flags
= EXT4_I(inode
)->i_flags
;
4632 unsigned int new_fl
= 0;
4634 if (flags
& EXT4_SYNC_FL
)
4636 if (flags
& EXT4_APPEND_FL
)
4638 if (flags
& EXT4_IMMUTABLE_FL
)
4639 new_fl
|= S_IMMUTABLE
;
4640 if (flags
& EXT4_NOATIME_FL
)
4641 new_fl
|= S_NOATIME
;
4642 if (flags
& EXT4_DIRSYNC_FL
)
4643 new_fl
|= S_DIRSYNC
;
4644 if (ext4_should_use_dax(inode
))
4646 if (flags
& EXT4_ENCRYPT_FL
)
4647 new_fl
|= S_ENCRYPTED
;
4648 inode_set_flags(inode
, new_fl
,
4649 S_SYNC
|S_APPEND
|S_IMMUTABLE
|S_NOATIME
|S_DIRSYNC
|S_DAX
|
4653 static blkcnt_t
ext4_inode_blocks(struct ext4_inode
*raw_inode
,
4654 struct ext4_inode_info
*ei
)
4657 struct inode
*inode
= &(ei
->vfs_inode
);
4658 struct super_block
*sb
= inode
->i_sb
;
4660 if (ext4_has_feature_huge_file(sb
)) {
4661 /* we are using combined 48 bit field */
4662 i_blocks
= ((u64
)le16_to_cpu(raw_inode
->i_blocks_high
)) << 32 |
4663 le32_to_cpu(raw_inode
->i_blocks_lo
);
4664 if (ext4_test_inode_flag(inode
, EXT4_INODE_HUGE_FILE
)) {
4665 /* i_blocks represent file system block size */
4666 return i_blocks
<< (inode
->i_blkbits
- 9);
4671 return le32_to_cpu(raw_inode
->i_blocks_lo
);
4675 static inline void ext4_iget_extra_inode(struct inode
*inode
,
4676 struct ext4_inode
*raw_inode
,
4677 struct ext4_inode_info
*ei
)
4679 __le32
*magic
= (void *)raw_inode
+
4680 EXT4_GOOD_OLD_INODE_SIZE
+ ei
->i_extra_isize
;
4681 if (EXT4_GOOD_OLD_INODE_SIZE
+ ei
->i_extra_isize
+ sizeof(__le32
) <=
4682 EXT4_INODE_SIZE(inode
->i_sb
) &&
4683 *magic
== cpu_to_le32(EXT4_XATTR_MAGIC
)) {
4684 ext4_set_inode_state(inode
, EXT4_STATE_XATTR
);
4685 ext4_find_inline_data_nolock(inode
);
4687 EXT4_I(inode
)->i_inline_off
= 0;
4690 int ext4_get_projid(struct inode
*inode
, kprojid_t
*projid
)
4692 if (!ext4_has_feature_project(inode
->i_sb
))
4694 *projid
= EXT4_I(inode
)->i_projid
;
4698 struct inode
*ext4_iget(struct super_block
*sb
, unsigned long ino
)
4700 struct ext4_iloc iloc
;
4701 struct ext4_inode
*raw_inode
;
4702 struct ext4_inode_info
*ei
;
4703 struct inode
*inode
;
4704 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
4712 inode
= iget_locked(sb
, ino
);
4714 return ERR_PTR(-ENOMEM
);
4715 if (!(inode
->i_state
& I_NEW
))
4721 ret
= __ext4_get_inode_loc(inode
, &iloc
, 0);
4724 raw_inode
= ext4_raw_inode(&iloc
);
4726 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
) {
4727 ei
->i_extra_isize
= le16_to_cpu(raw_inode
->i_extra_isize
);
4728 if (EXT4_GOOD_OLD_INODE_SIZE
+ ei
->i_extra_isize
>
4729 EXT4_INODE_SIZE(inode
->i_sb
) ||
4730 (ei
->i_extra_isize
& 3)) {
4731 EXT4_ERROR_INODE(inode
,
4732 "bad extra_isize %u (inode size %u)",
4734 EXT4_INODE_SIZE(inode
->i_sb
));
4735 ret
= -EFSCORRUPTED
;
4739 ei
->i_extra_isize
= 0;
4741 /* Precompute checksum seed for inode metadata */
4742 if (ext4_has_metadata_csum(sb
)) {
4743 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
4745 __le32 inum
= cpu_to_le32(inode
->i_ino
);
4746 __le32 gen
= raw_inode
->i_generation
;
4747 csum
= ext4_chksum(sbi
, sbi
->s_csum_seed
, (__u8
*)&inum
,
4749 ei
->i_csum_seed
= ext4_chksum(sbi
, csum
, (__u8
*)&gen
,
4753 if (!ext4_inode_csum_verify(inode
, raw_inode
, ei
)) {
4754 EXT4_ERROR_INODE(inode
, "checksum invalid");
4759 inode
->i_mode
= le16_to_cpu(raw_inode
->i_mode
);
4760 i_uid
= (uid_t
)le16_to_cpu(raw_inode
->i_uid_low
);
4761 i_gid
= (gid_t
)le16_to_cpu(raw_inode
->i_gid_low
);
4762 if (ext4_has_feature_project(sb
) &&
4763 EXT4_INODE_SIZE(sb
) > EXT4_GOOD_OLD_INODE_SIZE
&&
4764 EXT4_FITS_IN_INODE(raw_inode
, ei
, i_projid
))
4765 i_projid
= (projid_t
)le32_to_cpu(raw_inode
->i_projid
);
4767 i_projid
= EXT4_DEF_PROJID
;
4769 if (!(test_opt(inode
->i_sb
, NO_UID32
))) {
4770 i_uid
|= le16_to_cpu(raw_inode
->i_uid_high
) << 16;
4771 i_gid
|= le16_to_cpu(raw_inode
->i_gid_high
) << 16;
4773 i_uid_write(inode
, i_uid
);
4774 i_gid_write(inode
, i_gid
);
4775 ei
->i_projid
= make_kprojid(&init_user_ns
, i_projid
);
4776 set_nlink(inode
, le16_to_cpu(raw_inode
->i_links_count
));
4778 ext4_clear_state_flags(ei
); /* Only relevant on 32-bit archs */
4779 ei
->i_inline_off
= 0;
4780 ei
->i_dir_start_lookup
= 0;
4781 ei
->i_dtime
= le32_to_cpu(raw_inode
->i_dtime
);
4782 /* We now have enough fields to check if the inode was active or not.
4783 * This is needed because nfsd might try to access dead inodes
4784 * the test is that same one that e2fsck uses
4785 * NeilBrown 1999oct15
4787 if (inode
->i_nlink
== 0) {
4788 if ((inode
->i_mode
== 0 ||
4789 !(EXT4_SB(inode
->i_sb
)->s_mount_state
& EXT4_ORPHAN_FS
)) &&
4790 ino
!= EXT4_BOOT_LOADER_INO
) {
4791 /* this inode is deleted */
4795 /* The only unlinked inodes we let through here have
4796 * valid i_mode and are being read by the orphan
4797 * recovery code: that's fine, we're about to complete
4798 * the process of deleting those.
4799 * OR it is the EXT4_BOOT_LOADER_INO which is
4800 * not initialized on a new filesystem. */
4802 ei
->i_flags
= le32_to_cpu(raw_inode
->i_flags
);
4803 inode
->i_blocks
= ext4_inode_blocks(raw_inode
, ei
);
4804 ei
->i_file_acl
= le32_to_cpu(raw_inode
->i_file_acl_lo
);
4805 if (ext4_has_feature_64bit(sb
))
4807 ((__u64
)le16_to_cpu(raw_inode
->i_file_acl_high
)) << 32;
4808 inode
->i_size
= ext4_isize(sb
, raw_inode
);
4809 if ((size
= i_size_read(inode
)) < 0) {
4810 EXT4_ERROR_INODE(inode
, "bad i_size value: %lld", size
);
4811 ret
= -EFSCORRUPTED
;
4814 ei
->i_disksize
= inode
->i_size
;
4816 ei
->i_reserved_quota
= 0;
4818 inode
->i_generation
= le32_to_cpu(raw_inode
->i_generation
);
4819 ei
->i_block_group
= iloc
.block_group
;
4820 ei
->i_last_alloc_group
= ~0;
4822 * NOTE! The in-memory inode i_data array is in little-endian order
4823 * even on big-endian machines: we do NOT byteswap the block numbers!
4825 for (block
= 0; block
< EXT4_N_BLOCKS
; block
++)
4826 ei
->i_data
[block
] = raw_inode
->i_block
[block
];
4827 INIT_LIST_HEAD(&ei
->i_orphan
);
4830 * Set transaction id's of transactions that have to be committed
4831 * to finish f[data]sync. We set them to currently running transaction
4832 * as we cannot be sure that the inode or some of its metadata isn't
4833 * part of the transaction - the inode could have been reclaimed and
4834 * now it is reread from disk.
4837 transaction_t
*transaction
;
4840 read_lock(&journal
->j_state_lock
);
4841 if (journal
->j_running_transaction
)
4842 transaction
= journal
->j_running_transaction
;
4844 transaction
= journal
->j_committing_transaction
;
4846 tid
= transaction
->t_tid
;
4848 tid
= journal
->j_commit_sequence
;
4849 read_unlock(&journal
->j_state_lock
);
4850 ei
->i_sync_tid
= tid
;
4851 ei
->i_datasync_tid
= tid
;
4854 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
) {
4855 if (ei
->i_extra_isize
== 0) {
4856 /* The extra space is currently unused. Use it. */
4857 BUILD_BUG_ON(sizeof(struct ext4_inode
) & 3);
4858 ei
->i_extra_isize
= sizeof(struct ext4_inode
) -
4859 EXT4_GOOD_OLD_INODE_SIZE
;
4861 ext4_iget_extra_inode(inode
, raw_inode
, ei
);
4865 EXT4_INODE_GET_XTIME(i_ctime
, inode
, raw_inode
);
4866 EXT4_INODE_GET_XTIME(i_mtime
, inode
, raw_inode
);
4867 EXT4_INODE_GET_XTIME(i_atime
, inode
, raw_inode
);
4868 EXT4_EINODE_GET_XTIME(i_crtime
, ei
, raw_inode
);
4870 if (likely(!test_opt2(inode
->i_sb
, HURD_COMPAT
))) {
4871 inode
->i_version
= le32_to_cpu(raw_inode
->i_disk_version
);
4872 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
) {
4873 if (EXT4_FITS_IN_INODE(raw_inode
, ei
, i_version_hi
))
4875 (__u64
)(le32_to_cpu(raw_inode
->i_version_hi
)) << 32;
4880 if (ei
->i_file_acl
&&
4881 !ext4_data_block_valid(EXT4_SB(sb
), ei
->i_file_acl
, 1)) {
4882 EXT4_ERROR_INODE(inode
, "bad extended attribute block %llu",
4884 ret
= -EFSCORRUPTED
;
4886 } else if (!ext4_has_inline_data(inode
)) {
4887 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)) {
4888 if ((S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
4889 (S_ISLNK(inode
->i_mode
) &&
4890 !ext4_inode_is_fast_symlink(inode
))))
4891 /* Validate extent which is part of inode */
4892 ret
= ext4_ext_check_inode(inode
);
4893 } else if (S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
4894 (S_ISLNK(inode
->i_mode
) &&
4895 !ext4_inode_is_fast_symlink(inode
))) {
4896 /* Validate block references which are part of inode */
4897 ret
= ext4_ind_check_inode(inode
);
4903 if (S_ISREG(inode
->i_mode
)) {
4904 inode
->i_op
= &ext4_file_inode_operations
;
4905 inode
->i_fop
= &ext4_file_operations
;
4906 ext4_set_aops(inode
);
4907 } else if (S_ISDIR(inode
->i_mode
)) {
4908 inode
->i_op
= &ext4_dir_inode_operations
;
4909 inode
->i_fop
= &ext4_dir_operations
;
4910 } else if (S_ISLNK(inode
->i_mode
)) {
4911 if (ext4_encrypted_inode(inode
)) {
4912 inode
->i_op
= &ext4_encrypted_symlink_inode_operations
;
4913 ext4_set_aops(inode
);
4914 } else if (ext4_inode_is_fast_symlink(inode
)) {
4915 inode
->i_link
= (char *)ei
->i_data
;
4916 inode
->i_op
= &ext4_fast_symlink_inode_operations
;
4917 nd_terminate_link(ei
->i_data
, inode
->i_size
,
4918 sizeof(ei
->i_data
) - 1);
4920 inode
->i_op
= &ext4_symlink_inode_operations
;
4921 ext4_set_aops(inode
);
4923 inode_nohighmem(inode
);
4924 } else if (S_ISCHR(inode
->i_mode
) || S_ISBLK(inode
->i_mode
) ||
4925 S_ISFIFO(inode
->i_mode
) || S_ISSOCK(inode
->i_mode
)) {
4926 inode
->i_op
= &ext4_special_inode_operations
;
4927 if (raw_inode
->i_block
[0])
4928 init_special_inode(inode
, inode
->i_mode
,
4929 old_decode_dev(le32_to_cpu(raw_inode
->i_block
[0])));
4931 init_special_inode(inode
, inode
->i_mode
,
4932 new_decode_dev(le32_to_cpu(raw_inode
->i_block
[1])));
4933 } else if (ino
== EXT4_BOOT_LOADER_INO
) {
4934 make_bad_inode(inode
);
4936 ret
= -EFSCORRUPTED
;
4937 EXT4_ERROR_INODE(inode
, "bogus i_mode (%o)", inode
->i_mode
);
4941 ext4_set_inode_flags(inode
);
4943 unlock_new_inode(inode
);
4949 return ERR_PTR(ret
);
4952 struct inode
*ext4_iget_normal(struct super_block
*sb
, unsigned long ino
)
4954 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
4955 return ERR_PTR(-EFSCORRUPTED
);
4956 return ext4_iget(sb
, ino
);
4959 static int ext4_inode_blocks_set(handle_t
*handle
,
4960 struct ext4_inode
*raw_inode
,
4961 struct ext4_inode_info
*ei
)
4963 struct inode
*inode
= &(ei
->vfs_inode
);
4964 u64 i_blocks
= inode
->i_blocks
;
4965 struct super_block
*sb
= inode
->i_sb
;
4967 if (i_blocks
<= ~0U) {
4969 * i_blocks can be represented in a 32 bit variable
4970 * as multiple of 512 bytes
4972 raw_inode
->i_blocks_lo
= cpu_to_le32(i_blocks
);
4973 raw_inode
->i_blocks_high
= 0;
4974 ext4_clear_inode_flag(inode
, EXT4_INODE_HUGE_FILE
);
4977 if (!ext4_has_feature_huge_file(sb
))
4980 if (i_blocks
<= 0xffffffffffffULL
) {
4982 * i_blocks can be represented in a 48 bit variable
4983 * as multiple of 512 bytes
4985 raw_inode
->i_blocks_lo
= cpu_to_le32(i_blocks
);
4986 raw_inode
->i_blocks_high
= cpu_to_le16(i_blocks
>> 32);
4987 ext4_clear_inode_flag(inode
, EXT4_INODE_HUGE_FILE
);
4989 ext4_set_inode_flag(inode
, EXT4_INODE_HUGE_FILE
);
4990 /* i_block is stored in file system block size */
4991 i_blocks
= i_blocks
>> (inode
->i_blkbits
- 9);
4992 raw_inode
->i_blocks_lo
= cpu_to_le32(i_blocks
);
4993 raw_inode
->i_blocks_high
= cpu_to_le16(i_blocks
>> 32);
4998 struct other_inode
{
4999 unsigned long orig_ino
;
5000 struct ext4_inode
*raw_inode
;
5003 static int other_inode_match(struct inode
* inode
, unsigned long ino
,
5006 struct other_inode
*oi
= (struct other_inode
*) data
;
5008 if ((inode
->i_ino
!= ino
) ||
5009 (inode
->i_state
& (I_FREEING
| I_WILL_FREE
| I_NEW
|
5010 I_DIRTY_SYNC
| I_DIRTY_DATASYNC
)) ||
5011 ((inode
->i_state
& I_DIRTY_TIME
) == 0))
5013 spin_lock(&inode
->i_lock
);
5014 if (((inode
->i_state
& (I_FREEING
| I_WILL_FREE
| I_NEW
|
5015 I_DIRTY_SYNC
| I_DIRTY_DATASYNC
)) == 0) &&
5016 (inode
->i_state
& I_DIRTY_TIME
)) {
5017 struct ext4_inode_info
*ei
= EXT4_I(inode
);
5019 inode
->i_state
&= ~(I_DIRTY_TIME
| I_DIRTY_TIME_EXPIRED
);
5020 spin_unlock(&inode
->i_lock
);
5022 spin_lock(&ei
->i_raw_lock
);
5023 EXT4_INODE_SET_XTIME(i_ctime
, inode
, oi
->raw_inode
);
5024 EXT4_INODE_SET_XTIME(i_mtime
, inode
, oi
->raw_inode
);
5025 EXT4_INODE_SET_XTIME(i_atime
, inode
, oi
->raw_inode
);
5026 ext4_inode_csum_set(inode
, oi
->raw_inode
, ei
);
5027 spin_unlock(&ei
->i_raw_lock
);
5028 trace_ext4_other_inode_update_time(inode
, oi
->orig_ino
);
5031 spin_unlock(&inode
->i_lock
);
5036 * Opportunistically update the other time fields for other inodes in
5037 * the same inode table block.
5039 static void ext4_update_other_inodes_time(struct super_block
*sb
,
5040 unsigned long orig_ino
, char *buf
)
5042 struct other_inode oi
;
5044 int i
, inodes_per_block
= EXT4_SB(sb
)->s_inodes_per_block
;
5045 int inode_size
= EXT4_INODE_SIZE(sb
);
5047 oi
.orig_ino
= orig_ino
;
5049 * Calculate the first inode in the inode table block. Inode
5050 * numbers are one-based. That is, the first inode in a block
5051 * (assuming 4k blocks and 256 byte inodes) is (n*16 + 1).
5053 ino
= ((orig_ino
- 1) & ~(inodes_per_block
- 1)) + 1;
5054 for (i
= 0; i
< inodes_per_block
; i
++, ino
++, buf
+= inode_size
) {
5055 if (ino
== orig_ino
)
5057 oi
.raw_inode
= (struct ext4_inode
*) buf
;
5058 (void) find_inode_nowait(sb
, ino
, other_inode_match
, &oi
);
5063 * Post the struct inode info into an on-disk inode location in the
5064 * buffer-cache. This gobbles the caller's reference to the
5065 * buffer_head in the inode location struct.
5067 * The caller must have write access to iloc->bh.
5069 static int ext4_do_update_inode(handle_t
*handle
,
5070 struct inode
*inode
,
5071 struct ext4_iloc
*iloc
)
5073 struct ext4_inode
*raw_inode
= ext4_raw_inode(iloc
);
5074 struct ext4_inode_info
*ei
= EXT4_I(inode
);
5075 struct buffer_head
*bh
= iloc
->bh
;
5076 struct super_block
*sb
= inode
->i_sb
;
5077 int err
= 0, rc
, block
;
5078 int need_datasync
= 0, set_large_file
= 0;
5083 spin_lock(&ei
->i_raw_lock
);
5085 /* For fields not tracked in the in-memory inode,
5086 * initialise them to zero for new inodes. */
5087 if (ext4_test_inode_state(inode
, EXT4_STATE_NEW
))
5088 memset(raw_inode
, 0, EXT4_SB(inode
->i_sb
)->s_inode_size
);
5090 raw_inode
->i_mode
= cpu_to_le16(inode
->i_mode
);
5091 i_uid
= i_uid_read(inode
);
5092 i_gid
= i_gid_read(inode
);
5093 i_projid
= from_kprojid(&init_user_ns
, ei
->i_projid
);
5094 if (!(test_opt(inode
->i_sb
, NO_UID32
))) {
5095 raw_inode
->i_uid_low
= cpu_to_le16(low_16_bits(i_uid
));
5096 raw_inode
->i_gid_low
= cpu_to_le16(low_16_bits(i_gid
));
5098 * Fix up interoperability with old kernels. Otherwise, old inodes get
5099 * re-used with the upper 16 bits of the uid/gid intact
5101 if (ei
->i_dtime
&& list_empty(&ei
->i_orphan
)) {
5102 raw_inode
->i_uid_high
= 0;
5103 raw_inode
->i_gid_high
= 0;
5105 raw_inode
->i_uid_high
=
5106 cpu_to_le16(high_16_bits(i_uid
));
5107 raw_inode
->i_gid_high
=
5108 cpu_to_le16(high_16_bits(i_gid
));
5111 raw_inode
->i_uid_low
= cpu_to_le16(fs_high2lowuid(i_uid
));
5112 raw_inode
->i_gid_low
= cpu_to_le16(fs_high2lowgid(i_gid
));
5113 raw_inode
->i_uid_high
= 0;
5114 raw_inode
->i_gid_high
= 0;
5116 raw_inode
->i_links_count
= cpu_to_le16(inode
->i_nlink
);
5118 EXT4_INODE_SET_XTIME(i_ctime
, inode
, raw_inode
);
5119 EXT4_INODE_SET_XTIME(i_mtime
, inode
, raw_inode
);
5120 EXT4_INODE_SET_XTIME(i_atime
, inode
, raw_inode
);
5121 EXT4_EINODE_SET_XTIME(i_crtime
, ei
, raw_inode
);
5123 err
= ext4_inode_blocks_set(handle
, raw_inode
, ei
);
5125 spin_unlock(&ei
->i_raw_lock
);
5128 raw_inode
->i_dtime
= cpu_to_le32(ei
->i_dtime
);
5129 raw_inode
->i_flags
= cpu_to_le32(ei
->i_flags
& 0xFFFFFFFF);
5130 if (likely(!test_opt2(inode
->i_sb
, HURD_COMPAT
)))
5131 raw_inode
->i_file_acl_high
=
5132 cpu_to_le16(ei
->i_file_acl
>> 32);
5133 raw_inode
->i_file_acl_lo
= cpu_to_le32(ei
->i_file_acl
);
5134 if (ei
->i_disksize
!= ext4_isize(inode
->i_sb
, raw_inode
)) {
5135 ext4_isize_set(raw_inode
, ei
->i_disksize
);
5138 if (ei
->i_disksize
> 0x7fffffffULL
) {
5139 if (!ext4_has_feature_large_file(sb
) ||
5140 EXT4_SB(sb
)->s_es
->s_rev_level
==
5141 cpu_to_le32(EXT4_GOOD_OLD_REV
))
5144 raw_inode
->i_generation
= cpu_to_le32(inode
->i_generation
);
5145 if (S_ISCHR(inode
->i_mode
) || S_ISBLK(inode
->i_mode
)) {
5146 if (old_valid_dev(inode
->i_rdev
)) {
5147 raw_inode
->i_block
[0] =
5148 cpu_to_le32(old_encode_dev(inode
->i_rdev
));
5149 raw_inode
->i_block
[1] = 0;
5151 raw_inode
->i_block
[0] = 0;
5152 raw_inode
->i_block
[1] =
5153 cpu_to_le32(new_encode_dev(inode
->i_rdev
));
5154 raw_inode
->i_block
[2] = 0;
5156 } else if (!ext4_has_inline_data(inode
)) {
5157 for (block
= 0; block
< EXT4_N_BLOCKS
; block
++)
5158 raw_inode
->i_block
[block
] = ei
->i_data
[block
];
5161 if (likely(!test_opt2(inode
->i_sb
, HURD_COMPAT
))) {
5162 raw_inode
->i_disk_version
= cpu_to_le32(inode
->i_version
);
5163 if (ei
->i_extra_isize
) {
5164 if (EXT4_FITS_IN_INODE(raw_inode
, ei
, i_version_hi
))
5165 raw_inode
->i_version_hi
=
5166 cpu_to_le32(inode
->i_version
>> 32);
5167 raw_inode
->i_extra_isize
=
5168 cpu_to_le16(ei
->i_extra_isize
);
5172 BUG_ON(!ext4_has_feature_project(inode
->i_sb
) &&
5173 i_projid
!= EXT4_DEF_PROJID
);
5175 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
&&
5176 EXT4_FITS_IN_INODE(raw_inode
, ei
, i_projid
))
5177 raw_inode
->i_projid
= cpu_to_le32(i_projid
);
5179 ext4_inode_csum_set(inode
, raw_inode
, ei
);
5180 spin_unlock(&ei
->i_raw_lock
);
5181 if (inode
->i_sb
->s_flags
& MS_LAZYTIME
)
5182 ext4_update_other_inodes_time(inode
->i_sb
, inode
->i_ino
,
5185 BUFFER_TRACE(bh
, "call ext4_handle_dirty_metadata");
5186 rc
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
5189 ext4_clear_inode_state(inode
, EXT4_STATE_NEW
);
5190 if (set_large_file
) {
5191 BUFFER_TRACE(EXT4_SB(sb
)->s_sbh
, "get write access");
5192 err
= ext4_journal_get_write_access(handle
, EXT4_SB(sb
)->s_sbh
);
5195 ext4_update_dynamic_rev(sb
);
5196 ext4_set_feature_large_file(sb
);
5197 ext4_handle_sync(handle
);
5198 err
= ext4_handle_dirty_super(handle
, sb
);
5200 ext4_update_inode_fsync_trans(handle
, inode
, need_datasync
);
5203 ext4_std_error(inode
->i_sb
, err
);
5208 * ext4_write_inode()
5210 * We are called from a few places:
5212 * - Within generic_file_aio_write() -> generic_write_sync() for O_SYNC files.
5213 * Here, there will be no transaction running. We wait for any running
5214 * transaction to commit.
5216 * - Within flush work (sys_sync(), kupdate and such).
5217 * We wait on commit, if told to.
5219 * - Within iput_final() -> write_inode_now()
5220 * We wait on commit, if told to.
5222 * In all cases it is actually safe for us to return without doing anything,
5223 * because the inode has been copied into a raw inode buffer in
5224 * ext4_mark_inode_dirty(). This is a correctness thing for WB_SYNC_ALL
5227 * Note that we are absolutely dependent upon all inode dirtiers doing the
5228 * right thing: they *must* call mark_inode_dirty() after dirtying info in
5229 * which we are interested.
5231 * It would be a bug for them to not do this. The code:
5233 * mark_inode_dirty(inode)
5235 * inode->i_size = expr;
5237 * is in error because write_inode() could occur while `stuff()' is running,
5238 * and the new i_size will be lost. Plus the inode will no longer be on the
5239 * superblock's dirty inode list.
5241 int ext4_write_inode(struct inode
*inode
, struct writeback_control
*wbc
)
5245 if (WARN_ON_ONCE(current
->flags
& PF_MEMALLOC
))
5248 if (EXT4_SB(inode
->i_sb
)->s_journal
) {
5249 if (ext4_journal_current_handle()) {
5250 jbd_debug(1, "called recursively, non-PF_MEMALLOC!\n");
5256 * No need to force transaction in WB_SYNC_NONE mode. Also
5257 * ext4_sync_fs() will force the commit after everything is
5260 if (wbc
->sync_mode
!= WB_SYNC_ALL
|| wbc
->for_sync
)
5263 err
= ext4_force_commit(inode
->i_sb
);
5265 struct ext4_iloc iloc
;
5267 err
= __ext4_get_inode_loc(inode
, &iloc
, 0);
5271 * sync(2) will flush the whole buffer cache. No need to do
5272 * it here separately for each inode.
5274 if (wbc
->sync_mode
== WB_SYNC_ALL
&& !wbc
->for_sync
)
5275 sync_dirty_buffer(iloc
.bh
);
5276 if (buffer_req(iloc
.bh
) && !buffer_uptodate(iloc
.bh
)) {
5277 EXT4_ERROR_INODE_BLOCK(inode
, iloc
.bh
->b_blocknr
,
5278 "IO error syncing inode");
5287 * In data=journal mode ext4_journalled_invalidatepage() may fail to invalidate
5288 * buffers that are attached to a page stradding i_size and are undergoing
5289 * commit. In that case we have to wait for commit to finish and try again.
5291 static void ext4_wait_for_tail_page_commit(struct inode
*inode
)
5295 journal_t
*journal
= EXT4_SB(inode
->i_sb
)->s_journal
;
5296 tid_t commit_tid
= 0;
5299 offset
= inode
->i_size
& (PAGE_SIZE
- 1);
5301 * All buffers in the last page remain valid? Then there's nothing to
5302 * do. We do the check mainly to optimize the common PAGE_SIZE ==
5305 if (offset
> PAGE_SIZE
- i_blocksize(inode
))
5308 page
= find_lock_page(inode
->i_mapping
,
5309 inode
->i_size
>> PAGE_SHIFT
);
5312 ret
= __ext4_journalled_invalidatepage(page
, offset
,
5313 PAGE_SIZE
- offset
);
5319 read_lock(&journal
->j_state_lock
);
5320 if (journal
->j_committing_transaction
)
5321 commit_tid
= journal
->j_committing_transaction
->t_tid
;
5322 read_unlock(&journal
->j_state_lock
);
5324 jbd2_log_wait_commit(journal
, commit_tid
);
5331 * Called from notify_change.
5333 * We want to trap VFS attempts to truncate the file as soon as
5334 * possible. In particular, we want to make sure that when the VFS
5335 * shrinks i_size, we put the inode on the orphan list and modify
5336 * i_disksize immediately, so that during the subsequent flushing of
5337 * dirty pages and freeing of disk blocks, we can guarantee that any
5338 * commit will leave the blocks being flushed in an unused state on
5339 * disk. (On recovery, the inode will get truncated and the blocks will
5340 * be freed, so we have a strong guarantee that no future commit will
5341 * leave these blocks visible to the user.)
5343 * Another thing we have to assure is that if we are in ordered mode
5344 * and inode is still attached to the committing transaction, we must
5345 * we start writeout of all the dirty pages which are being truncated.
5346 * This way we are sure that all the data written in the previous
5347 * transaction are already on disk (truncate waits for pages under
5350 * Called with inode->i_mutex down.
5352 int ext4_setattr(struct dentry
*dentry
, struct iattr
*attr
)
5354 struct inode
*inode
= d_inode(dentry
);
5357 const unsigned int ia_valid
= attr
->ia_valid
;
5359 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode
->i_sb
))))
5362 error
= setattr_prepare(dentry
, attr
);
5366 error
= fscrypt_prepare_setattr(dentry
, attr
);
5370 if (is_quota_modification(inode
, attr
)) {
5371 error
= dquot_initialize(inode
);
5375 if ((ia_valid
& ATTR_UID
&& !uid_eq(attr
->ia_uid
, inode
->i_uid
)) ||
5376 (ia_valid
& ATTR_GID
&& !gid_eq(attr
->ia_gid
, inode
->i_gid
))) {
5379 /* (user+group)*(old+new) structure, inode write (sb,
5380 * inode block, ? - but truncate inode update has it) */
5381 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
,
5382 (EXT4_MAXQUOTAS_INIT_BLOCKS(inode
->i_sb
) +
5383 EXT4_MAXQUOTAS_DEL_BLOCKS(inode
->i_sb
)) + 3);
5384 if (IS_ERR(handle
)) {
5385 error
= PTR_ERR(handle
);
5389 /* dquot_transfer() calls back ext4_get_inode_usage() which
5390 * counts xattr inode references.
5392 down_read(&EXT4_I(inode
)->xattr_sem
);
5393 error
= dquot_transfer(inode
, attr
);
5394 up_read(&EXT4_I(inode
)->xattr_sem
);
5397 ext4_journal_stop(handle
);
5400 /* Update corresponding info in inode so that everything is in
5401 * one transaction */
5402 if (attr
->ia_valid
& ATTR_UID
)
5403 inode
->i_uid
= attr
->ia_uid
;
5404 if (attr
->ia_valid
& ATTR_GID
)
5405 inode
->i_gid
= attr
->ia_gid
;
5406 error
= ext4_mark_inode_dirty(handle
, inode
);
5407 ext4_journal_stop(handle
);
5410 if (attr
->ia_valid
& ATTR_SIZE
) {
5412 loff_t oldsize
= inode
->i_size
;
5413 int shrink
= (attr
->ia_size
<= inode
->i_size
);
5415 if (!(ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))) {
5416 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
5418 if (attr
->ia_size
> sbi
->s_bitmap_maxbytes
)
5421 if (!S_ISREG(inode
->i_mode
))
5424 if (IS_I_VERSION(inode
) && attr
->ia_size
!= inode
->i_size
)
5425 inode_inc_iversion(inode
);
5427 if (ext4_should_order_data(inode
) &&
5428 (attr
->ia_size
< inode
->i_size
)) {
5429 error
= ext4_begin_ordered_truncate(inode
,
5434 if (attr
->ia_size
!= inode
->i_size
) {
5435 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 3);
5436 if (IS_ERR(handle
)) {
5437 error
= PTR_ERR(handle
);
5440 if (ext4_handle_valid(handle
) && shrink
) {
5441 error
= ext4_orphan_add(handle
, inode
);
5445 * Update c/mtime on truncate up, ext4_truncate() will
5446 * update c/mtime in shrink case below
5449 inode
->i_mtime
= current_time(inode
);
5450 inode
->i_ctime
= inode
->i_mtime
;
5452 down_write(&EXT4_I(inode
)->i_data_sem
);
5453 EXT4_I(inode
)->i_disksize
= attr
->ia_size
;
5454 rc
= ext4_mark_inode_dirty(handle
, inode
);
5458 * We have to update i_size under i_data_sem together
5459 * with i_disksize to avoid races with writeback code
5460 * running ext4_wb_update_i_disksize().
5463 i_size_write(inode
, attr
->ia_size
);
5464 up_write(&EXT4_I(inode
)->i_data_sem
);
5465 ext4_journal_stop(handle
);
5468 ext4_orphan_del(NULL
, inode
);
5473 pagecache_isize_extended(inode
, oldsize
, inode
->i_size
);
5476 * Blocks are going to be removed from the inode. Wait
5477 * for dio in flight. Temporarily disable
5478 * dioread_nolock to prevent livelock.
5481 if (!ext4_should_journal_data(inode
)) {
5482 ext4_inode_block_unlocked_dio(inode
);
5483 inode_dio_wait(inode
);
5484 ext4_inode_resume_unlocked_dio(inode
);
5486 ext4_wait_for_tail_page_commit(inode
);
5488 down_write(&EXT4_I(inode
)->i_mmap_sem
);
5490 * Truncate pagecache after we've waited for commit
5491 * in data=journal mode to make pages freeable.
5493 truncate_pagecache(inode
, inode
->i_size
);
5495 rc
= ext4_truncate(inode
);
5499 up_write(&EXT4_I(inode
)->i_mmap_sem
);
5503 setattr_copy(inode
, attr
);
5504 mark_inode_dirty(inode
);
5508 * If the call to ext4_truncate failed to get a transaction handle at
5509 * all, we need to clean up the in-core orphan list manually.
5511 if (orphan
&& inode
->i_nlink
)
5512 ext4_orphan_del(NULL
, inode
);
5514 if (!error
&& (ia_valid
& ATTR_MODE
))
5515 rc
= posix_acl_chmod(inode
, inode
->i_mode
);
5518 ext4_std_error(inode
->i_sb
, error
);
5524 int ext4_getattr(const struct path
*path
, struct kstat
*stat
,
5525 u32 request_mask
, unsigned int query_flags
)
5527 struct inode
*inode
= d_inode(path
->dentry
);
5528 struct ext4_inode
*raw_inode
;
5529 struct ext4_inode_info
*ei
= EXT4_I(inode
);
5532 if (EXT4_FITS_IN_INODE(raw_inode
, ei
, i_crtime
)) {
5533 stat
->result_mask
|= STATX_BTIME
;
5534 stat
->btime
.tv_sec
= ei
->i_crtime
.tv_sec
;
5535 stat
->btime
.tv_nsec
= ei
->i_crtime
.tv_nsec
;
5538 flags
= ei
->i_flags
& EXT4_FL_USER_VISIBLE
;
5539 if (flags
& EXT4_APPEND_FL
)
5540 stat
->attributes
|= STATX_ATTR_APPEND
;
5541 if (flags
& EXT4_COMPR_FL
)
5542 stat
->attributes
|= STATX_ATTR_COMPRESSED
;
5543 if (flags
& EXT4_ENCRYPT_FL
)
5544 stat
->attributes
|= STATX_ATTR_ENCRYPTED
;
5545 if (flags
& EXT4_IMMUTABLE_FL
)
5546 stat
->attributes
|= STATX_ATTR_IMMUTABLE
;
5547 if (flags
& EXT4_NODUMP_FL
)
5548 stat
->attributes
|= STATX_ATTR_NODUMP
;
5550 stat
->attributes_mask
|= (STATX_ATTR_APPEND
|
5551 STATX_ATTR_COMPRESSED
|
5552 STATX_ATTR_ENCRYPTED
|
5553 STATX_ATTR_IMMUTABLE
|
5556 generic_fillattr(inode
, stat
);
5560 int ext4_file_getattr(const struct path
*path
, struct kstat
*stat
,
5561 u32 request_mask
, unsigned int query_flags
)
5563 struct inode
*inode
= d_inode(path
->dentry
);
5564 u64 delalloc_blocks
;
5566 ext4_getattr(path
, stat
, request_mask
, query_flags
);
5569 * If there is inline data in the inode, the inode will normally not
5570 * have data blocks allocated (it may have an external xattr block).
5571 * Report at least one sector for such files, so tools like tar, rsync,
5572 * others don't incorrectly think the file is completely sparse.
5574 if (unlikely(ext4_has_inline_data(inode
)))
5575 stat
->blocks
+= (stat
->size
+ 511) >> 9;
5578 * We can't update i_blocks if the block allocation is delayed
5579 * otherwise in the case of system crash before the real block
5580 * allocation is done, we will have i_blocks inconsistent with
5581 * on-disk file blocks.
5582 * We always keep i_blocks updated together with real
5583 * allocation. But to not confuse with user, stat
5584 * will return the blocks that include the delayed allocation
5585 * blocks for this file.
5587 delalloc_blocks
= EXT4_C2B(EXT4_SB(inode
->i_sb
),
5588 EXT4_I(inode
)->i_reserved_data_blocks
);
5589 stat
->blocks
+= delalloc_blocks
<< (inode
->i_sb
->s_blocksize_bits
- 9);
5593 static int ext4_index_trans_blocks(struct inode
*inode
, int lblocks
,
5596 if (!(ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)))
5597 return ext4_ind_trans_blocks(inode
, lblocks
);
5598 return ext4_ext_index_trans_blocks(inode
, pextents
);
5602 * Account for index blocks, block groups bitmaps and block group
5603 * descriptor blocks if modify datablocks and index blocks
5604 * worse case, the indexs blocks spread over different block groups
5606 * If datablocks are discontiguous, they are possible to spread over
5607 * different block groups too. If they are contiguous, with flexbg,
5608 * they could still across block group boundary.
5610 * Also account for superblock, inode, quota and xattr blocks
5612 static int ext4_meta_trans_blocks(struct inode
*inode
, int lblocks
,
5615 ext4_group_t groups
, ngroups
= ext4_get_groups_count(inode
->i_sb
);
5621 * How many index blocks need to touch to map @lblocks logical blocks
5622 * to @pextents physical extents?
5624 idxblocks
= ext4_index_trans_blocks(inode
, lblocks
, pextents
);
5629 * Now let's see how many group bitmaps and group descriptors need
5632 groups
= idxblocks
+ pextents
;
5634 if (groups
> ngroups
)
5636 if (groups
> EXT4_SB(inode
->i_sb
)->s_gdb_count
)
5637 gdpblocks
= EXT4_SB(inode
->i_sb
)->s_gdb_count
;
5639 /* bitmaps and block group descriptor blocks */
5640 ret
+= groups
+ gdpblocks
;
5642 /* Blocks for super block, inode, quota and xattr blocks */
5643 ret
+= EXT4_META_TRANS_BLOCKS(inode
->i_sb
);
5649 * Calculate the total number of credits to reserve to fit
5650 * the modification of a single pages into a single transaction,
5651 * which may include multiple chunks of block allocations.
5653 * This could be called via ext4_write_begin()
5655 * We need to consider the worse case, when
5656 * one new block per extent.
5658 int ext4_writepage_trans_blocks(struct inode
*inode
)
5660 int bpp
= ext4_journal_blocks_per_page(inode
);
5663 ret
= ext4_meta_trans_blocks(inode
, bpp
, bpp
);
5665 /* Account for data blocks for journalled mode */
5666 if (ext4_should_journal_data(inode
))
5672 * Calculate the journal credits for a chunk of data modification.
5674 * This is called from DIO, fallocate or whoever calling
5675 * ext4_map_blocks() to map/allocate a chunk of contiguous disk blocks.
5677 * journal buffers for data blocks are not included here, as DIO
5678 * and fallocate do no need to journal data buffers.
5680 int ext4_chunk_trans_blocks(struct inode
*inode
, int nrblocks
)
5682 return ext4_meta_trans_blocks(inode
, nrblocks
, 1);
5686 * The caller must have previously called ext4_reserve_inode_write().
5687 * Give this, we know that the caller already has write access to iloc->bh.
5689 int ext4_mark_iloc_dirty(handle_t
*handle
,
5690 struct inode
*inode
, struct ext4_iloc
*iloc
)
5694 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode
->i_sb
))))
5697 if (IS_I_VERSION(inode
))
5698 inode_inc_iversion(inode
);
5700 /* the do_update_inode consumes one bh->b_count */
5703 /* ext4_do_update_inode() does jbd2_journal_dirty_metadata */
5704 err
= ext4_do_update_inode(handle
, inode
, iloc
);
5710 * On success, We end up with an outstanding reference count against
5711 * iloc->bh. This _must_ be cleaned up later.
5715 ext4_reserve_inode_write(handle_t
*handle
, struct inode
*inode
,
5716 struct ext4_iloc
*iloc
)
5720 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode
->i_sb
))))
5723 err
= ext4_get_inode_loc(inode
, iloc
);
5725 BUFFER_TRACE(iloc
->bh
, "get_write_access");
5726 err
= ext4_journal_get_write_access(handle
, iloc
->bh
);
5732 ext4_std_error(inode
->i_sb
, err
);
5736 static int __ext4_expand_extra_isize(struct inode
*inode
,
5737 unsigned int new_extra_isize
,
5738 struct ext4_iloc
*iloc
,
5739 handle_t
*handle
, int *no_expand
)
5741 struct ext4_inode
*raw_inode
;
5742 struct ext4_xattr_ibody_header
*header
;
5745 raw_inode
= ext4_raw_inode(iloc
);
5747 header
= IHDR(inode
, raw_inode
);
5749 /* No extended attributes present */
5750 if (!ext4_test_inode_state(inode
, EXT4_STATE_XATTR
) ||
5751 header
->h_magic
!= cpu_to_le32(EXT4_XATTR_MAGIC
)) {
5752 memset((void *)raw_inode
+ EXT4_GOOD_OLD_INODE_SIZE
+
5753 EXT4_I(inode
)->i_extra_isize
, 0,
5754 new_extra_isize
- EXT4_I(inode
)->i_extra_isize
);
5755 EXT4_I(inode
)->i_extra_isize
= new_extra_isize
;
5759 /* try to expand with EAs present */
5760 error
= ext4_expand_extra_isize_ea(inode
, new_extra_isize
,
5764 * Inode size expansion failed; don't try again
5773 * Expand an inode by new_extra_isize bytes.
5774 * Returns 0 on success or negative error number on failure.
5776 static int ext4_try_to_expand_extra_isize(struct inode
*inode
,
5777 unsigned int new_extra_isize
,
5778 struct ext4_iloc iloc
,
5784 if (ext4_test_inode_state(inode
, EXT4_STATE_NO_EXPAND
))
5788 * In nojournal mode, we can immediately attempt to expand
5789 * the inode. When journaled, we first need to obtain extra
5790 * buffer credits since we may write into the EA block
5791 * with this same handle. If journal_extend fails, then it will
5792 * only result in a minor loss of functionality for that inode.
5793 * If this is felt to be critical, then e2fsck should be run to
5794 * force a large enough s_min_extra_isize.
5796 if (ext4_handle_valid(handle
) &&
5797 jbd2_journal_extend(handle
,
5798 EXT4_DATA_TRANS_BLOCKS(inode
->i_sb
)) != 0)
5801 if (ext4_write_trylock_xattr(inode
, &no_expand
) == 0)
5804 error
= __ext4_expand_extra_isize(inode
, new_extra_isize
, &iloc
,
5805 handle
, &no_expand
);
5806 ext4_write_unlock_xattr(inode
, &no_expand
);
5811 int ext4_expand_extra_isize(struct inode
*inode
,
5812 unsigned int new_extra_isize
,
5813 struct ext4_iloc
*iloc
)
5819 if (ext4_test_inode_state(inode
, EXT4_STATE_NO_EXPAND
)) {
5824 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
,
5825 EXT4_DATA_TRANS_BLOCKS(inode
->i_sb
));
5826 if (IS_ERR(handle
)) {
5827 error
= PTR_ERR(handle
);
5832 ext4_write_lock_xattr(inode
, &no_expand
);
5834 BUFFER_TRACE(iloc
.bh
, "get_write_access");
5835 error
= ext4_journal_get_write_access(handle
, iloc
->bh
);
5841 error
= __ext4_expand_extra_isize(inode
, new_extra_isize
, iloc
,
5842 handle
, &no_expand
);
5844 rc
= ext4_mark_iloc_dirty(handle
, inode
, iloc
);
5848 ext4_write_unlock_xattr(inode
, &no_expand
);
5850 ext4_journal_stop(handle
);
5855 * What we do here is to mark the in-core inode as clean with respect to inode
5856 * dirtiness (it may still be data-dirty).
5857 * This means that the in-core inode may be reaped by prune_icache
5858 * without having to perform any I/O. This is a very good thing,
5859 * because *any* task may call prune_icache - even ones which
5860 * have a transaction open against a different journal.
5862 * Is this cheating? Not really. Sure, we haven't written the
5863 * inode out, but prune_icache isn't a user-visible syncing function.
5864 * Whenever the user wants stuff synced (sys_sync, sys_msync, sys_fsync)
5865 * we start and wait on commits.
5867 int ext4_mark_inode_dirty(handle_t
*handle
, struct inode
*inode
)
5869 struct ext4_iloc iloc
;
5870 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
5874 trace_ext4_mark_inode_dirty(inode
, _RET_IP_
);
5875 err
= ext4_reserve_inode_write(handle
, inode
, &iloc
);
5879 if (EXT4_I(inode
)->i_extra_isize
< sbi
->s_want_extra_isize
)
5880 ext4_try_to_expand_extra_isize(inode
, sbi
->s_want_extra_isize
,
5883 return ext4_mark_iloc_dirty(handle
, inode
, &iloc
);
5887 * ext4_dirty_inode() is called from __mark_inode_dirty()
5889 * We're really interested in the case where a file is being extended.
5890 * i_size has been changed by generic_commit_write() and we thus need
5891 * to include the updated inode in the current transaction.
5893 * Also, dquot_alloc_block() will always dirty the inode when blocks
5894 * are allocated to the file.
5896 * If the inode is marked synchronous, we don't honour that here - doing
5897 * so would cause a commit on atime updates, which we don't bother doing.
5898 * We handle synchronous inodes at the highest possible level.
5900 * If only the I_DIRTY_TIME flag is set, we can skip everything. If
5901 * I_DIRTY_TIME and I_DIRTY_SYNC is set, the only inode fields we need
5902 * to copy into the on-disk inode structure are the timestamp files.
5904 void ext4_dirty_inode(struct inode
*inode
, int flags
)
5908 if (flags
== I_DIRTY_TIME
)
5910 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 2);
5914 ext4_mark_inode_dirty(handle
, inode
);
5916 ext4_journal_stop(handle
);
5923 * Bind an inode's backing buffer_head into this transaction, to prevent
5924 * it from being flushed to disk early. Unlike
5925 * ext4_reserve_inode_write, this leaves behind no bh reference and
5926 * returns no iloc structure, so the caller needs to repeat the iloc
5927 * lookup to mark the inode dirty later.
5929 static int ext4_pin_inode(handle_t
*handle
, struct inode
*inode
)
5931 struct ext4_iloc iloc
;
5935 err
= ext4_get_inode_loc(inode
, &iloc
);
5937 BUFFER_TRACE(iloc
.bh
, "get_write_access");
5938 err
= jbd2_journal_get_write_access(handle
, iloc
.bh
);
5940 err
= ext4_handle_dirty_metadata(handle
,
5946 ext4_std_error(inode
->i_sb
, err
);
5951 int ext4_change_inode_journal_flag(struct inode
*inode
, int val
)
5956 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
5959 * We have to be very careful here: changing a data block's
5960 * journaling status dynamically is dangerous. If we write a
5961 * data block to the journal, change the status and then delete
5962 * that block, we risk forgetting to revoke the old log record
5963 * from the journal and so a subsequent replay can corrupt data.
5964 * So, first we make sure that the journal is empty and that
5965 * nobody is changing anything.
5968 journal
= EXT4_JOURNAL(inode
);
5971 if (is_journal_aborted(journal
))
5974 /* Wait for all existing dio workers */
5975 ext4_inode_block_unlocked_dio(inode
);
5976 inode_dio_wait(inode
);
5979 * Before flushing the journal and switching inode's aops, we have
5980 * to flush all dirty data the inode has. There can be outstanding
5981 * delayed allocations, there can be unwritten extents created by
5982 * fallocate or buffered writes in dioread_nolock mode covered by
5983 * dirty data which can be converted only after flushing the dirty
5984 * data (and journalled aops don't know how to handle these cases).
5987 down_write(&EXT4_I(inode
)->i_mmap_sem
);
5988 err
= filemap_write_and_wait(inode
->i_mapping
);
5990 up_write(&EXT4_I(inode
)->i_mmap_sem
);
5991 ext4_inode_resume_unlocked_dio(inode
);
5996 percpu_down_write(&sbi
->s_journal_flag_rwsem
);
5997 jbd2_journal_lock_updates(journal
);
6000 * OK, there are no updates running now, and all cached data is
6001 * synced to disk. We are now in a completely consistent state
6002 * which doesn't have anything in the journal, and we know that
6003 * no filesystem updates are running, so it is safe to modify
6004 * the inode's in-core data-journaling state flag now.
6008 ext4_set_inode_flag(inode
, EXT4_INODE_JOURNAL_DATA
);
6010 err
= jbd2_journal_flush(journal
);
6012 jbd2_journal_unlock_updates(journal
);
6013 percpu_up_write(&sbi
->s_journal_flag_rwsem
);
6014 ext4_inode_resume_unlocked_dio(inode
);
6017 ext4_clear_inode_flag(inode
, EXT4_INODE_JOURNAL_DATA
);
6019 ext4_set_aops(inode
);
6021 jbd2_journal_unlock_updates(journal
);
6022 percpu_up_write(&sbi
->s_journal_flag_rwsem
);
6025 up_write(&EXT4_I(inode
)->i_mmap_sem
);
6026 ext4_inode_resume_unlocked_dio(inode
);
6028 /* Finally we can mark the inode as dirty. */
6030 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 1);
6032 return PTR_ERR(handle
);
6034 err
= ext4_mark_inode_dirty(handle
, inode
);
6035 ext4_handle_sync(handle
);
6036 ext4_journal_stop(handle
);
6037 ext4_std_error(inode
->i_sb
, err
);
6042 static int ext4_bh_unmapped(handle_t
*handle
, struct buffer_head
*bh
)
6044 return !buffer_mapped(bh
);
6047 int ext4_page_mkwrite(struct vm_fault
*vmf
)
6049 struct vm_area_struct
*vma
= vmf
->vma
;
6050 struct page
*page
= vmf
->page
;
6054 struct file
*file
= vma
->vm_file
;
6055 struct inode
*inode
= file_inode(file
);
6056 struct address_space
*mapping
= inode
->i_mapping
;
6058 get_block_t
*get_block
;
6061 sb_start_pagefault(inode
->i_sb
);
6062 file_update_time(vma
->vm_file
);
6064 down_read(&EXT4_I(inode
)->i_mmap_sem
);
6066 ret
= ext4_convert_inline_data(inode
);
6070 /* Delalloc case is easy... */
6071 if (test_opt(inode
->i_sb
, DELALLOC
) &&
6072 !ext4_should_journal_data(inode
) &&
6073 !ext4_nonda_switch(inode
->i_sb
)) {
6075 ret
= block_page_mkwrite(vma
, vmf
,
6076 ext4_da_get_block_prep
);
6077 } while (ret
== -ENOSPC
&&
6078 ext4_should_retry_alloc(inode
->i_sb
, &retries
));
6083 size
= i_size_read(inode
);
6084 /* Page got truncated from under us? */
6085 if (page
->mapping
!= mapping
|| page_offset(page
) > size
) {
6087 ret
= VM_FAULT_NOPAGE
;
6091 if (page
->index
== size
>> PAGE_SHIFT
)
6092 len
= size
& ~PAGE_MASK
;
6096 * Return if we have all the buffers mapped. This avoids the need to do
6097 * journal_start/journal_stop which can block and take a long time
6099 if (page_has_buffers(page
)) {
6100 if (!ext4_walk_page_buffers(NULL
, page_buffers(page
),
6102 ext4_bh_unmapped
)) {
6103 /* Wait so that we don't change page under IO */
6104 wait_for_stable_page(page
);
6105 ret
= VM_FAULT_LOCKED
;
6110 /* OK, we need to fill the hole... */
6111 if (ext4_should_dioread_nolock(inode
))
6112 get_block
= ext4_get_block_unwritten
;
6114 get_block
= ext4_get_block
;
6116 handle
= ext4_journal_start(inode
, EXT4_HT_WRITE_PAGE
,
6117 ext4_writepage_trans_blocks(inode
));
6118 if (IS_ERR(handle
)) {
6119 ret
= VM_FAULT_SIGBUS
;
6122 ret
= block_page_mkwrite(vma
, vmf
, get_block
);
6123 if (!ret
&& ext4_should_journal_data(inode
)) {
6124 if (ext4_walk_page_buffers(handle
, page_buffers(page
), 0,
6125 PAGE_SIZE
, NULL
, do_journal_get_write_access
)) {
6127 ret
= VM_FAULT_SIGBUS
;
6128 ext4_journal_stop(handle
);
6131 ext4_set_inode_state(inode
, EXT4_STATE_JDATA
);
6133 ext4_journal_stop(handle
);
6134 if (ret
== -ENOSPC
&& ext4_should_retry_alloc(inode
->i_sb
, &retries
))
6137 ret
= block_page_mkwrite_return(ret
);
6139 up_read(&EXT4_I(inode
)->i_mmap_sem
);
6140 sb_end_pagefault(inode
->i_sb
);
6144 int ext4_filemap_fault(struct vm_fault
*vmf
)
6146 struct inode
*inode
= file_inode(vmf
->vma
->vm_file
);
6149 down_read(&EXT4_I(inode
)->i_mmap_sem
);
6150 err
= filemap_fault(vmf
);
6151 up_read(&EXT4_I(inode
)->i_mmap_sem
);