2 * linux/fs/ext4/inode.c
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
11 * linux/fs/minix/inode.c
13 * Copyright (C) 1991, 1992 Linus Torvalds
15 * 64-bit file support on 64-bit platforms by Jakub Jelinek
16 * (jj@sunsite.ms.mff.cuni.cz)
18 * Assorted race fixes, rewrite of ext4_get_block() by Al Viro, 2000
22 #include <linux/time.h>
23 #include <linux/highuid.h>
24 #include <linux/pagemap.h>
25 #include <linux/dax.h>
26 #include <linux/quotaops.h>
27 #include <linux/string.h>
28 #include <linux/buffer_head.h>
29 #include <linux/writeback.h>
30 #include <linux/pagevec.h>
31 #include <linux/mpage.h>
32 #include <linux/namei.h>
33 #include <linux/uio.h>
34 #include <linux/bio.h>
35 #include <linux/workqueue.h>
36 #include <linux/kernel.h>
37 #include <linux/printk.h>
38 #include <linux/slab.h>
39 #include <linux/bitops.h>
40 #include <linux/iomap.h>
42 #include "ext4_jbd2.h"
47 #include <trace/events/ext4.h>
49 #define MPAGE_DA_EXTENT_TAIL 0x01
51 static __u32
ext4_inode_csum(struct inode
*inode
, struct ext4_inode
*raw
,
52 struct ext4_inode_info
*ei
)
54 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
57 int offset
= offsetof(struct ext4_inode
, i_checksum_lo
);
58 unsigned int csum_size
= sizeof(dummy_csum
);
60 csum
= ext4_chksum(sbi
, ei
->i_csum_seed
, (__u8
*)raw
, offset
);
61 csum
= ext4_chksum(sbi
, csum
, (__u8
*)&dummy_csum
, csum_size
);
63 csum
= ext4_chksum(sbi
, csum
, (__u8
*)raw
+ offset
,
64 EXT4_GOOD_OLD_INODE_SIZE
- offset
);
66 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
) {
67 offset
= offsetof(struct ext4_inode
, i_checksum_hi
);
68 csum
= ext4_chksum(sbi
, csum
, (__u8
*)raw
+
69 EXT4_GOOD_OLD_INODE_SIZE
,
70 offset
- EXT4_GOOD_OLD_INODE_SIZE
);
71 if (EXT4_FITS_IN_INODE(raw
, ei
, i_checksum_hi
)) {
72 csum
= ext4_chksum(sbi
, csum
, (__u8
*)&dummy_csum
,
76 csum
= ext4_chksum(sbi
, csum
, (__u8
*)raw
+ offset
,
77 EXT4_INODE_SIZE(inode
->i_sb
) - offset
);
83 static int ext4_inode_csum_verify(struct inode
*inode
, struct ext4_inode
*raw
,
84 struct ext4_inode_info
*ei
)
86 __u32 provided
, calculated
;
88 if (EXT4_SB(inode
->i_sb
)->s_es
->s_creator_os
!=
89 cpu_to_le32(EXT4_OS_LINUX
) ||
90 !ext4_has_metadata_csum(inode
->i_sb
))
93 provided
= le16_to_cpu(raw
->i_checksum_lo
);
94 calculated
= ext4_inode_csum(inode
, raw
, ei
);
95 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
&&
96 EXT4_FITS_IN_INODE(raw
, ei
, i_checksum_hi
))
97 provided
|= ((__u32
)le16_to_cpu(raw
->i_checksum_hi
)) << 16;
101 return provided
== calculated
;
104 static void ext4_inode_csum_set(struct inode
*inode
, struct ext4_inode
*raw
,
105 struct ext4_inode_info
*ei
)
109 if (EXT4_SB(inode
->i_sb
)->s_es
->s_creator_os
!=
110 cpu_to_le32(EXT4_OS_LINUX
) ||
111 !ext4_has_metadata_csum(inode
->i_sb
))
114 csum
= ext4_inode_csum(inode
, raw
, ei
);
115 raw
->i_checksum_lo
= cpu_to_le16(csum
& 0xFFFF);
116 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
&&
117 EXT4_FITS_IN_INODE(raw
, ei
, i_checksum_hi
))
118 raw
->i_checksum_hi
= cpu_to_le16(csum
>> 16);
121 static inline int ext4_begin_ordered_truncate(struct inode
*inode
,
124 trace_ext4_begin_ordered_truncate(inode
, new_size
);
126 * If jinode is zero, then we never opened the file for
127 * writing, so there's no need to call
128 * jbd2_journal_begin_ordered_truncate() since there's no
129 * outstanding writes we need to flush.
131 if (!EXT4_I(inode
)->jinode
)
133 return jbd2_journal_begin_ordered_truncate(EXT4_JOURNAL(inode
),
134 EXT4_I(inode
)->jinode
,
138 static void ext4_invalidatepage(struct page
*page
, unsigned int offset
,
139 unsigned int length
);
140 static int __ext4_journalled_writepage(struct page
*page
, unsigned int len
);
141 static int ext4_bh_delay_or_unwritten(handle_t
*handle
, struct buffer_head
*bh
);
142 static int ext4_meta_trans_blocks(struct inode
*inode
, int lblocks
,
146 * Test whether an inode is a fast symlink.
148 int ext4_inode_is_fast_symlink(struct inode
*inode
)
150 int ea_blocks
= EXT4_I(inode
)->i_file_acl
?
151 EXT4_CLUSTER_SIZE(inode
->i_sb
) >> 9 : 0;
153 if (ext4_has_inline_data(inode
))
156 return (S_ISLNK(inode
->i_mode
) && inode
->i_blocks
- ea_blocks
== 0);
160 * Restart the transaction associated with *handle. This does a commit,
161 * so before we call here everything must be consistently dirtied against
164 int ext4_truncate_restart_trans(handle_t
*handle
, struct inode
*inode
,
170 * Drop i_data_sem to avoid deadlock with ext4_map_blocks. At this
171 * moment, get_block can be called only for blocks inside i_size since
172 * page cache has been already dropped and writes are blocked by
173 * i_mutex. So we can safely drop the i_data_sem here.
175 BUG_ON(EXT4_JOURNAL(inode
) == NULL
);
176 jbd_debug(2, "restarting handle %p\n", handle
);
177 up_write(&EXT4_I(inode
)->i_data_sem
);
178 ret
= ext4_journal_restart(handle
, nblocks
);
179 down_write(&EXT4_I(inode
)->i_data_sem
);
180 ext4_discard_preallocations(inode
);
186 * Called at the last iput() if i_nlink is zero.
188 void ext4_evict_inode(struct inode
*inode
)
193 trace_ext4_evict_inode(inode
);
195 if (inode
->i_nlink
) {
197 * When journalling data dirty buffers are tracked only in the
198 * journal. So although mm thinks everything is clean and
199 * ready for reaping the inode might still have some pages to
200 * write in the running transaction or waiting to be
201 * checkpointed. Thus calling jbd2_journal_invalidatepage()
202 * (via truncate_inode_pages()) to discard these buffers can
203 * cause data loss. Also even if we did not discard these
204 * buffers, we would have no way to find them after the inode
205 * is reaped and thus user could see stale data if he tries to
206 * read them before the transaction is checkpointed. So be
207 * careful and force everything to disk here... We use
208 * ei->i_datasync_tid to store the newest transaction
209 * containing inode's data.
211 * Note that directories do not have this problem because they
212 * don't use page cache.
214 if (inode
->i_ino
!= EXT4_JOURNAL_INO
&&
215 ext4_should_journal_data(inode
) &&
216 (S_ISLNK(inode
->i_mode
) || S_ISREG(inode
->i_mode
))) {
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
);
241 handle
= ext4_journal_start(inode
, EXT4_HT_TRUNCATE
,
242 ext4_blocks_for_truncate(inode
)+3);
243 if (IS_ERR(handle
)) {
244 ext4_std_error(inode
->i_sb
, PTR_ERR(handle
));
246 * If we're going to skip the normal cleanup, we still need to
247 * make sure that the in-core orphan linked list is properly
250 ext4_orphan_del(NULL
, inode
);
251 sb_end_intwrite(inode
->i_sb
);
256 ext4_handle_sync(handle
);
258 err
= ext4_mark_inode_dirty(handle
, inode
);
260 ext4_warning(inode
->i_sb
,
261 "couldn't mark inode dirty (err %d)", err
);
264 if (inode
->i_blocks
) {
265 err
= ext4_truncate(inode
);
267 ext4_error(inode
->i_sb
,
268 "couldn't truncate inode %lu (err %d)",
275 * ext4_ext_truncate() doesn't reserve any slop when it
276 * restarts journal transactions; therefore there may not be
277 * enough credits left in the handle to remove the inode from
278 * the orphan list and set the dtime field.
280 if (!ext4_handle_has_enough_credits(handle
, 3)) {
281 err
= ext4_journal_extend(handle
, 3);
283 err
= ext4_journal_restart(handle
, 3);
285 ext4_warning(inode
->i_sb
,
286 "couldn't extend journal (err %d)", err
);
288 ext4_journal_stop(handle
);
289 ext4_orphan_del(NULL
, inode
);
290 sb_end_intwrite(inode
->i_sb
);
296 * Kill off the orphan record which ext4_truncate created.
297 * AKPM: I think this can be inside the above `if'.
298 * Note that ext4_orphan_del() has to be able to cope with the
299 * deletion of a non-existent orphan - this is because we don't
300 * know if ext4_truncate() actually created an orphan record.
301 * (Well, we could do this if we need to, but heck - it works)
303 ext4_orphan_del(handle
, inode
);
304 EXT4_I(inode
)->i_dtime
= get_seconds();
307 * One subtle ordering requirement: if anything has gone wrong
308 * (transaction abort, IO errors, whatever), then we can still
309 * do these next steps (the fs will already have been marked as
310 * having errors), but we can't free the inode if the mark_dirty
313 if (ext4_mark_inode_dirty(handle
, inode
))
314 /* If that failed, just do the required in-core inode clear. */
315 ext4_clear_inode(inode
);
317 ext4_free_inode(handle
, inode
);
318 ext4_journal_stop(handle
);
319 sb_end_intwrite(inode
->i_sb
);
322 ext4_clear_inode(inode
); /* We must guarantee clearing of inode... */
326 qsize_t
*ext4_get_reserved_space(struct inode
*inode
)
328 return &EXT4_I(inode
)->i_reserved_quota
;
333 * Called with i_data_sem down, which is important since we can call
334 * ext4_discard_preallocations() from here.
336 void ext4_da_update_reserve_space(struct inode
*inode
,
337 int used
, int quota_claim
)
339 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
340 struct ext4_inode_info
*ei
= EXT4_I(inode
);
342 spin_lock(&ei
->i_block_reservation_lock
);
343 trace_ext4_da_update_reserve_space(inode
, used
, quota_claim
);
344 if (unlikely(used
> ei
->i_reserved_data_blocks
)) {
345 ext4_warning(inode
->i_sb
, "%s: ino %lu, used %d "
346 "with only %d reserved data blocks",
347 __func__
, inode
->i_ino
, used
,
348 ei
->i_reserved_data_blocks
);
350 used
= ei
->i_reserved_data_blocks
;
353 /* Update per-inode reservations */
354 ei
->i_reserved_data_blocks
-= used
;
355 percpu_counter_sub(&sbi
->s_dirtyclusters_counter
, used
);
357 spin_unlock(&EXT4_I(inode
)->i_block_reservation_lock
);
359 /* Update quota subsystem for data blocks */
361 dquot_claim_block(inode
, EXT4_C2B(sbi
, used
));
364 * We did fallocate with an offset that is already delayed
365 * allocated. So on delayed allocated writeback we should
366 * not re-claim the quota for fallocated blocks.
368 dquot_release_reservation_block(inode
, EXT4_C2B(sbi
, used
));
372 * If we have done all the pending block allocations and if
373 * there aren't any writers on the inode, we can discard the
374 * inode's preallocations.
376 if ((ei
->i_reserved_data_blocks
== 0) &&
377 (atomic_read(&inode
->i_writecount
) == 0))
378 ext4_discard_preallocations(inode
);
381 static int __check_block_validity(struct inode
*inode
, const char *func
,
383 struct ext4_map_blocks
*map
)
385 if (!ext4_data_block_valid(EXT4_SB(inode
->i_sb
), map
->m_pblk
,
387 ext4_error_inode(inode
, func
, line
, map
->m_pblk
,
388 "lblock %lu mapped to illegal pblock "
389 "(length %d)", (unsigned long) map
->m_lblk
,
391 return -EFSCORRUPTED
;
396 int ext4_issue_zeroout(struct inode
*inode
, ext4_lblk_t lblk
, ext4_fsblk_t pblk
,
401 if (ext4_encrypted_inode(inode
))
402 return fscrypt_zeroout_range(inode
, lblk
, pblk
, len
);
404 ret
= sb_issue_zeroout(inode
->i_sb
, pblk
, len
, GFP_NOFS
);
411 #define check_block_validity(inode, map) \
412 __check_block_validity((inode), __func__, __LINE__, (map))
414 #ifdef ES_AGGRESSIVE_TEST
415 static void ext4_map_blocks_es_recheck(handle_t
*handle
,
417 struct ext4_map_blocks
*es_map
,
418 struct ext4_map_blocks
*map
,
425 * There is a race window that the result is not the same.
426 * e.g. xfstests #223 when dioread_nolock enables. The reason
427 * is that we lookup a block mapping in extent status tree with
428 * out taking i_data_sem. So at the time the unwritten extent
429 * could be converted.
431 down_read(&EXT4_I(inode
)->i_data_sem
);
432 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)) {
433 retval
= ext4_ext_map_blocks(handle
, inode
, map
, flags
&
434 EXT4_GET_BLOCKS_KEEP_SIZE
);
436 retval
= ext4_ind_map_blocks(handle
, inode
, map
, flags
&
437 EXT4_GET_BLOCKS_KEEP_SIZE
);
439 up_read((&EXT4_I(inode
)->i_data_sem
));
442 * We don't check m_len because extent will be collpased in status
443 * tree. So the m_len might not equal.
445 if (es_map
->m_lblk
!= map
->m_lblk
||
446 es_map
->m_flags
!= map
->m_flags
||
447 es_map
->m_pblk
!= map
->m_pblk
) {
448 printk("ES cache assertion failed for inode: %lu "
449 "es_cached ex [%d/%d/%llu/%x] != "
450 "found ex [%d/%d/%llu/%x] retval %d flags %x\n",
451 inode
->i_ino
, es_map
->m_lblk
, es_map
->m_len
,
452 es_map
->m_pblk
, es_map
->m_flags
, map
->m_lblk
,
453 map
->m_len
, map
->m_pblk
, map
->m_flags
,
457 #endif /* ES_AGGRESSIVE_TEST */
460 * The ext4_map_blocks() function tries to look up the requested blocks,
461 * and returns if the blocks are already mapped.
463 * Otherwise it takes the write lock of the i_data_sem and allocate blocks
464 * and store the allocated blocks in the result buffer head and mark it
467 * If file type is extents based, it will call ext4_ext_map_blocks(),
468 * Otherwise, call with ext4_ind_map_blocks() to handle indirect mapping
471 * On success, it returns the number of blocks being mapped or allocated. if
472 * create==0 and the blocks are pre-allocated and unwritten, the resulting @map
473 * is marked as unwritten. If the create == 1, it will mark @map as mapped.
475 * It returns 0 if plain look up failed (blocks have not been allocated), in
476 * that case, @map is returned as unmapped but we still do fill map->m_len to
477 * indicate the length of a hole starting at map->m_lblk.
479 * It returns the error in case of allocation failure.
481 int ext4_map_blocks(handle_t
*handle
, struct inode
*inode
,
482 struct ext4_map_blocks
*map
, int flags
)
484 struct extent_status es
;
487 #ifdef ES_AGGRESSIVE_TEST
488 struct ext4_map_blocks orig_map
;
490 memcpy(&orig_map
, map
, sizeof(*map
));
494 ext_debug("ext4_map_blocks(): inode %lu, flag %d, max_blocks %u,"
495 "logical block %lu\n", inode
->i_ino
, flags
, map
->m_len
,
496 (unsigned long) map
->m_lblk
);
499 * ext4_map_blocks returns an int, and m_len is an unsigned int
501 if (unlikely(map
->m_len
> INT_MAX
))
502 map
->m_len
= INT_MAX
;
504 /* We can handle the block number less than EXT_MAX_BLOCKS */
505 if (unlikely(map
->m_lblk
>= EXT_MAX_BLOCKS
))
506 return -EFSCORRUPTED
;
508 /* Lookup extent status tree firstly */
509 if (ext4_es_lookup_extent(inode
, map
->m_lblk
, &es
)) {
510 if (ext4_es_is_written(&es
) || ext4_es_is_unwritten(&es
)) {
511 map
->m_pblk
= ext4_es_pblock(&es
) +
512 map
->m_lblk
- es
.es_lblk
;
513 map
->m_flags
|= ext4_es_is_written(&es
) ?
514 EXT4_MAP_MAPPED
: EXT4_MAP_UNWRITTEN
;
515 retval
= es
.es_len
- (map
->m_lblk
- es
.es_lblk
);
516 if (retval
> map
->m_len
)
519 } else if (ext4_es_is_delayed(&es
) || ext4_es_is_hole(&es
)) {
521 retval
= es
.es_len
- (map
->m_lblk
- es
.es_lblk
);
522 if (retval
> map
->m_len
)
529 #ifdef ES_AGGRESSIVE_TEST
530 ext4_map_blocks_es_recheck(handle
, inode
, map
,
537 * Try to see if we can get the block without requesting a new
540 down_read(&EXT4_I(inode
)->i_data_sem
);
541 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)) {
542 retval
= ext4_ext_map_blocks(handle
, inode
, map
, flags
&
543 EXT4_GET_BLOCKS_KEEP_SIZE
);
545 retval
= ext4_ind_map_blocks(handle
, inode
, map
, flags
&
546 EXT4_GET_BLOCKS_KEEP_SIZE
);
551 if (unlikely(retval
!= map
->m_len
)) {
552 ext4_warning(inode
->i_sb
,
553 "ES len assertion failed for inode "
554 "%lu: retval %d != map->m_len %d",
555 inode
->i_ino
, retval
, map
->m_len
);
559 status
= map
->m_flags
& EXT4_MAP_UNWRITTEN
?
560 EXTENT_STATUS_UNWRITTEN
: EXTENT_STATUS_WRITTEN
;
561 if (!(flags
& EXT4_GET_BLOCKS_DELALLOC_RESERVE
) &&
562 !(status
& EXTENT_STATUS_WRITTEN
) &&
563 ext4_find_delalloc_range(inode
, map
->m_lblk
,
564 map
->m_lblk
+ map
->m_len
- 1))
565 status
|= EXTENT_STATUS_DELAYED
;
566 ret
= ext4_es_insert_extent(inode
, map
->m_lblk
,
567 map
->m_len
, map
->m_pblk
, status
);
571 up_read((&EXT4_I(inode
)->i_data_sem
));
574 if (retval
> 0 && map
->m_flags
& EXT4_MAP_MAPPED
) {
575 ret
= check_block_validity(inode
, map
);
580 /* If it is only a block(s) look up */
581 if ((flags
& EXT4_GET_BLOCKS_CREATE
) == 0)
585 * Returns if the blocks have already allocated
587 * Note that if blocks have been preallocated
588 * ext4_ext_get_block() returns the create = 0
589 * with buffer head unmapped.
591 if (retval
> 0 && map
->m_flags
& EXT4_MAP_MAPPED
)
593 * If we need to convert extent to unwritten
594 * we continue and do the actual work in
595 * ext4_ext_map_blocks()
597 if (!(flags
& EXT4_GET_BLOCKS_CONVERT_UNWRITTEN
))
601 * Here we clear m_flags because after allocating an new extent,
602 * it will be set again.
604 map
->m_flags
&= ~EXT4_MAP_FLAGS
;
607 * New blocks allocate and/or writing to unwritten extent
608 * will possibly result in updating i_data, so we take
609 * the write lock of i_data_sem, and call get_block()
610 * with create == 1 flag.
612 down_write(&EXT4_I(inode
)->i_data_sem
);
615 * We need to check for EXT4 here because migrate
616 * could have changed the inode type in between
618 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)) {
619 retval
= ext4_ext_map_blocks(handle
, inode
, map
, flags
);
621 retval
= ext4_ind_map_blocks(handle
, inode
, map
, flags
);
623 if (retval
> 0 && map
->m_flags
& EXT4_MAP_NEW
) {
625 * We allocated new blocks which will result in
626 * i_data's format changing. Force the migrate
627 * to fail by clearing migrate flags
629 ext4_clear_inode_state(inode
, EXT4_STATE_EXT_MIGRATE
);
633 * Update reserved blocks/metadata blocks after successful
634 * block allocation which had been deferred till now. We don't
635 * support fallocate for non extent files. So we can update
636 * reserve space here.
639 (flags
& EXT4_GET_BLOCKS_DELALLOC_RESERVE
))
640 ext4_da_update_reserve_space(inode
, retval
, 1);
646 if (unlikely(retval
!= map
->m_len
)) {
647 ext4_warning(inode
->i_sb
,
648 "ES len assertion failed for inode "
649 "%lu: retval %d != map->m_len %d",
650 inode
->i_ino
, retval
, map
->m_len
);
655 * We have to zeroout blocks before inserting them into extent
656 * status tree. Otherwise someone could look them up there and
657 * use them before they are really zeroed. We also have to
658 * unmap metadata before zeroing as otherwise writeback can
659 * overwrite zeros with stale data from block device.
661 if (flags
& EXT4_GET_BLOCKS_ZERO
&&
662 map
->m_flags
& EXT4_MAP_MAPPED
&&
663 map
->m_flags
& EXT4_MAP_NEW
) {
666 for (i
= 0; i
< map
->m_len
; i
++) {
667 unmap_underlying_metadata(inode
->i_sb
->s_bdev
,
670 ret
= ext4_issue_zeroout(inode
, map
->m_lblk
,
671 map
->m_pblk
, map
->m_len
);
679 * If the extent has been zeroed out, we don't need to update
680 * extent status tree.
682 if ((flags
& EXT4_GET_BLOCKS_PRE_IO
) &&
683 ext4_es_lookup_extent(inode
, map
->m_lblk
, &es
)) {
684 if (ext4_es_is_written(&es
))
687 status
= map
->m_flags
& EXT4_MAP_UNWRITTEN
?
688 EXTENT_STATUS_UNWRITTEN
: EXTENT_STATUS_WRITTEN
;
689 if (!(flags
& EXT4_GET_BLOCKS_DELALLOC_RESERVE
) &&
690 !(status
& EXTENT_STATUS_WRITTEN
) &&
691 ext4_find_delalloc_range(inode
, map
->m_lblk
,
692 map
->m_lblk
+ map
->m_len
- 1))
693 status
|= EXTENT_STATUS_DELAYED
;
694 ret
= ext4_es_insert_extent(inode
, map
->m_lblk
, map
->m_len
,
695 map
->m_pblk
, status
);
703 up_write((&EXT4_I(inode
)->i_data_sem
));
704 if (retval
> 0 && map
->m_flags
& EXT4_MAP_MAPPED
) {
705 ret
= check_block_validity(inode
, map
);
710 * Inodes with freshly allocated blocks where contents will be
711 * visible after transaction commit must be on transaction's
714 if (map
->m_flags
& EXT4_MAP_NEW
&&
715 !(map
->m_flags
& EXT4_MAP_UNWRITTEN
) &&
716 !(flags
& EXT4_GET_BLOCKS_ZERO
) &&
717 !IS_NOQUOTA(inode
) &&
718 ext4_should_order_data(inode
)) {
719 if (flags
& EXT4_GET_BLOCKS_IO_SUBMIT
)
720 ret
= ext4_jbd2_inode_add_wait(handle
, inode
);
722 ret
= ext4_jbd2_inode_add_write(handle
, inode
);
731 * Update EXT4_MAP_FLAGS in bh->b_state. For buffer heads attached to pages
732 * we have to be careful as someone else may be manipulating b_state as well.
734 static void ext4_update_bh_state(struct buffer_head
*bh
, unsigned long flags
)
736 unsigned long old_state
;
737 unsigned long new_state
;
739 flags
&= EXT4_MAP_FLAGS
;
741 /* Dummy buffer_head? Set non-atomically. */
743 bh
->b_state
= (bh
->b_state
& ~EXT4_MAP_FLAGS
) | flags
;
747 * Someone else may be modifying b_state. Be careful! This is ugly but
748 * once we get rid of using bh as a container for mapping information
749 * to pass to / from get_block functions, this can go away.
752 old_state
= READ_ONCE(bh
->b_state
);
753 new_state
= (old_state
& ~EXT4_MAP_FLAGS
) | flags
;
755 cmpxchg(&bh
->b_state
, old_state
, new_state
) != old_state
));
758 static int _ext4_get_block(struct inode
*inode
, sector_t iblock
,
759 struct buffer_head
*bh
, int flags
)
761 struct ext4_map_blocks map
;
764 if (ext4_has_inline_data(inode
))
768 map
.m_len
= bh
->b_size
>> inode
->i_blkbits
;
770 ret
= ext4_map_blocks(ext4_journal_current_handle(), inode
, &map
,
773 map_bh(bh
, inode
->i_sb
, map
.m_pblk
);
774 ext4_update_bh_state(bh
, map
.m_flags
);
775 bh
->b_size
= inode
->i_sb
->s_blocksize
* map
.m_len
;
777 } else if (ret
== 0) {
778 /* hole case, need to fill in bh->b_size */
779 bh
->b_size
= inode
->i_sb
->s_blocksize
* map
.m_len
;
784 int ext4_get_block(struct inode
*inode
, sector_t iblock
,
785 struct buffer_head
*bh
, int create
)
787 return _ext4_get_block(inode
, iblock
, bh
,
788 create
? EXT4_GET_BLOCKS_CREATE
: 0);
792 * Get block function used when preparing for buffered write if we require
793 * creating an unwritten extent if blocks haven't been allocated. The extent
794 * will be converted to written after the IO is complete.
796 int ext4_get_block_unwritten(struct inode
*inode
, sector_t iblock
,
797 struct buffer_head
*bh_result
, int create
)
799 ext4_debug("ext4_get_block_unwritten: inode %lu, create flag %d\n",
800 inode
->i_ino
, create
);
801 return _ext4_get_block(inode
, iblock
, bh_result
,
802 EXT4_GET_BLOCKS_IO_CREATE_EXT
);
805 /* Maximum number of blocks we map for direct IO at once. */
806 #define DIO_MAX_BLOCKS 4096
809 * Get blocks function for the cases that need to start a transaction -
810 * generally difference cases of direct IO and DAX IO. It also handles retries
813 static int ext4_get_block_trans(struct inode
*inode
, sector_t iblock
,
814 struct buffer_head
*bh_result
, int flags
)
821 /* Trim mapping request to maximum we can map at once for DIO */
822 if (bh_result
->b_size
>> inode
->i_blkbits
> DIO_MAX_BLOCKS
)
823 bh_result
->b_size
= DIO_MAX_BLOCKS
<< inode
->i_blkbits
;
824 dio_credits
= ext4_chunk_trans_blocks(inode
,
825 bh_result
->b_size
>> inode
->i_blkbits
);
827 handle
= ext4_journal_start(inode
, EXT4_HT_MAP_BLOCKS
, dio_credits
);
829 return PTR_ERR(handle
);
831 ret
= _ext4_get_block(inode
, iblock
, bh_result
, flags
);
832 ext4_journal_stop(handle
);
834 if (ret
== -ENOSPC
&& ext4_should_retry_alloc(inode
->i_sb
, &retries
))
839 /* Get block function for DIO reads and writes to inodes without extents */
840 int ext4_dio_get_block(struct inode
*inode
, sector_t iblock
,
841 struct buffer_head
*bh
, int create
)
843 /* We don't expect handle for direct IO */
844 WARN_ON_ONCE(ext4_journal_current_handle());
847 return _ext4_get_block(inode
, iblock
, bh
, 0);
848 return ext4_get_block_trans(inode
, iblock
, bh
, EXT4_GET_BLOCKS_CREATE
);
852 * Get block function for AIO DIO writes when we create unwritten extent if
853 * blocks are not allocated yet. The extent will be converted to written
854 * after IO is complete.
856 static int ext4_dio_get_block_unwritten_async(struct inode
*inode
,
857 sector_t iblock
, struct buffer_head
*bh_result
, int create
)
861 /* We don't expect handle for direct IO */
862 WARN_ON_ONCE(ext4_journal_current_handle());
864 ret
= ext4_get_block_trans(inode
, iblock
, bh_result
,
865 EXT4_GET_BLOCKS_IO_CREATE_EXT
);
868 * When doing DIO using unwritten extents, we need io_end to convert
869 * unwritten extents to written on IO completion. We allocate io_end
870 * once we spot unwritten extent and store it in b_private. Generic
871 * DIO code keeps b_private set and furthermore passes the value to
872 * our completion callback in 'private' argument.
874 if (!ret
&& buffer_unwritten(bh_result
)) {
875 if (!bh_result
->b_private
) {
876 ext4_io_end_t
*io_end
;
878 io_end
= ext4_init_io_end(inode
, GFP_KERNEL
);
881 bh_result
->b_private
= io_end
;
882 ext4_set_io_unwritten_flag(inode
, io_end
);
884 set_buffer_defer_completion(bh_result
);
891 * Get block function for non-AIO DIO writes when we create unwritten extent if
892 * blocks are not allocated yet. The extent will be converted to written
893 * after IO is complete from ext4_ext_direct_IO() function.
895 static int ext4_dio_get_block_unwritten_sync(struct inode
*inode
,
896 sector_t iblock
, struct buffer_head
*bh_result
, int create
)
900 /* We don't expect handle for direct IO */
901 WARN_ON_ONCE(ext4_journal_current_handle());
903 ret
= ext4_get_block_trans(inode
, iblock
, bh_result
,
904 EXT4_GET_BLOCKS_IO_CREATE_EXT
);
907 * Mark inode as having pending DIO writes to unwritten extents.
908 * ext4_ext_direct_IO() checks this flag and converts extents to
911 if (!ret
&& buffer_unwritten(bh_result
))
912 ext4_set_inode_state(inode
, EXT4_STATE_DIO_UNWRITTEN
);
917 static int ext4_dio_get_block_overwrite(struct inode
*inode
, sector_t iblock
,
918 struct buffer_head
*bh_result
, int create
)
922 ext4_debug("ext4_dio_get_block_overwrite: inode %lu, create flag %d\n",
923 inode
->i_ino
, create
);
924 /* We don't expect handle for direct IO */
925 WARN_ON_ONCE(ext4_journal_current_handle());
927 ret
= _ext4_get_block(inode
, iblock
, bh_result
, 0);
929 * Blocks should have been preallocated! ext4_file_write_iter() checks
932 WARN_ON_ONCE(!buffer_mapped(bh_result
) || buffer_unwritten(bh_result
));
939 * `handle' can be NULL if create is zero
941 struct buffer_head
*ext4_getblk(handle_t
*handle
, struct inode
*inode
,
942 ext4_lblk_t block
, int map_flags
)
944 struct ext4_map_blocks map
;
945 struct buffer_head
*bh
;
946 int create
= map_flags
& EXT4_GET_BLOCKS_CREATE
;
949 J_ASSERT(handle
!= NULL
|| create
== 0);
953 err
= ext4_map_blocks(handle
, inode
, &map
, map_flags
);
956 return create
? ERR_PTR(-ENOSPC
) : NULL
;
960 bh
= sb_getblk(inode
->i_sb
, map
.m_pblk
);
962 return ERR_PTR(-ENOMEM
);
963 if (map
.m_flags
& EXT4_MAP_NEW
) {
964 J_ASSERT(create
!= 0);
965 J_ASSERT(handle
!= NULL
);
968 * Now that we do not always journal data, we should
969 * keep in mind whether this should always journal the
970 * new buffer as metadata. For now, regular file
971 * writes use ext4_get_block instead, so it's not a
975 BUFFER_TRACE(bh
, "call get_create_access");
976 err
= ext4_journal_get_create_access(handle
, bh
);
981 if (!buffer_uptodate(bh
)) {
982 memset(bh
->b_data
, 0, inode
->i_sb
->s_blocksize
);
983 set_buffer_uptodate(bh
);
986 BUFFER_TRACE(bh
, "call ext4_handle_dirty_metadata");
987 err
= ext4_handle_dirty_metadata(handle
, inode
, bh
);
991 BUFFER_TRACE(bh
, "not a new buffer");
998 struct buffer_head
*ext4_bread(handle_t
*handle
, struct inode
*inode
,
999 ext4_lblk_t block
, int map_flags
)
1001 struct buffer_head
*bh
;
1003 bh
= ext4_getblk(handle
, inode
, block
, map_flags
);
1006 if (!bh
|| buffer_uptodate(bh
))
1008 ll_rw_block(REQ_OP_READ
, REQ_META
| REQ_PRIO
, 1, &bh
);
1010 if (buffer_uptodate(bh
))
1013 return ERR_PTR(-EIO
);
1016 int ext4_walk_page_buffers(handle_t
*handle
,
1017 struct buffer_head
*head
,
1021 int (*fn
)(handle_t
*handle
,
1022 struct buffer_head
*bh
))
1024 struct buffer_head
*bh
;
1025 unsigned block_start
, block_end
;
1026 unsigned blocksize
= head
->b_size
;
1028 struct buffer_head
*next
;
1030 for (bh
= head
, block_start
= 0;
1031 ret
== 0 && (bh
!= head
|| !block_start
);
1032 block_start
= block_end
, bh
= next
) {
1033 next
= bh
->b_this_page
;
1034 block_end
= block_start
+ blocksize
;
1035 if (block_end
<= from
|| block_start
>= to
) {
1036 if (partial
&& !buffer_uptodate(bh
))
1040 err
= (*fn
)(handle
, bh
);
1048 * To preserve ordering, it is essential that the hole instantiation and
1049 * the data write be encapsulated in a single transaction. We cannot
1050 * close off a transaction and start a new one between the ext4_get_block()
1051 * and the commit_write(). So doing the jbd2_journal_start at the start of
1052 * prepare_write() is the right place.
1054 * Also, this function can nest inside ext4_writepage(). In that case, we
1055 * *know* that ext4_writepage() has generated enough buffer credits to do the
1056 * whole page. So we won't block on the journal in that case, which is good,
1057 * because the caller may be PF_MEMALLOC.
1059 * By accident, ext4 can be reentered when a transaction is open via
1060 * quota file writes. If we were to commit the transaction while thus
1061 * reentered, there can be a deadlock - we would be holding a quota
1062 * lock, and the commit would never complete if another thread had a
1063 * transaction open and was blocking on the quota lock - a ranking
1066 * So what we do is to rely on the fact that jbd2_journal_stop/journal_start
1067 * will _not_ run commit under these circumstances because handle->h_ref
1068 * is elevated. We'll still have enough credits for the tiny quotafile
1071 int do_journal_get_write_access(handle_t
*handle
,
1072 struct buffer_head
*bh
)
1074 int dirty
= buffer_dirty(bh
);
1077 if (!buffer_mapped(bh
) || buffer_freed(bh
))
1080 * __block_write_begin() could have dirtied some buffers. Clean
1081 * the dirty bit as jbd2_journal_get_write_access() could complain
1082 * otherwise about fs integrity issues. Setting of the dirty bit
1083 * by __block_write_begin() isn't a real problem here as we clear
1084 * the bit before releasing a page lock and thus writeback cannot
1085 * ever write the buffer.
1088 clear_buffer_dirty(bh
);
1089 BUFFER_TRACE(bh
, "get write access");
1090 ret
= ext4_journal_get_write_access(handle
, bh
);
1092 ret
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
1096 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1097 static int ext4_block_write_begin(struct page
*page
, loff_t pos
, unsigned len
,
1098 get_block_t
*get_block
)
1100 unsigned from
= pos
& (PAGE_SIZE
- 1);
1101 unsigned to
= from
+ len
;
1102 struct inode
*inode
= page
->mapping
->host
;
1103 unsigned block_start
, block_end
;
1106 unsigned blocksize
= inode
->i_sb
->s_blocksize
;
1108 struct buffer_head
*bh
, *head
, *wait
[2], **wait_bh
= wait
;
1109 bool decrypt
= false;
1111 BUG_ON(!PageLocked(page
));
1112 BUG_ON(from
> PAGE_SIZE
);
1113 BUG_ON(to
> PAGE_SIZE
);
1116 if (!page_has_buffers(page
))
1117 create_empty_buffers(page
, blocksize
, 0);
1118 head
= page_buffers(page
);
1119 bbits
= ilog2(blocksize
);
1120 block
= (sector_t
)page
->index
<< (PAGE_SHIFT
- bbits
);
1122 for (bh
= head
, block_start
= 0; bh
!= head
|| !block_start
;
1123 block
++, block_start
= block_end
, bh
= bh
->b_this_page
) {
1124 block_end
= block_start
+ blocksize
;
1125 if (block_end
<= from
|| block_start
>= to
) {
1126 if (PageUptodate(page
)) {
1127 if (!buffer_uptodate(bh
))
1128 set_buffer_uptodate(bh
);
1133 clear_buffer_new(bh
);
1134 if (!buffer_mapped(bh
)) {
1135 WARN_ON(bh
->b_size
!= blocksize
);
1136 err
= get_block(inode
, block
, bh
, 1);
1139 if (buffer_new(bh
)) {
1140 unmap_underlying_metadata(bh
->b_bdev
,
1142 if (PageUptodate(page
)) {
1143 clear_buffer_new(bh
);
1144 set_buffer_uptodate(bh
);
1145 mark_buffer_dirty(bh
);
1148 if (block_end
> to
|| block_start
< from
)
1149 zero_user_segments(page
, to
, block_end
,
1154 if (PageUptodate(page
)) {
1155 if (!buffer_uptodate(bh
))
1156 set_buffer_uptodate(bh
);
1159 if (!buffer_uptodate(bh
) && !buffer_delay(bh
) &&
1160 !buffer_unwritten(bh
) &&
1161 (block_start
< from
|| block_end
> to
)) {
1162 ll_rw_block(REQ_OP_READ
, 0, 1, &bh
);
1164 decrypt
= ext4_encrypted_inode(inode
) &&
1165 S_ISREG(inode
->i_mode
);
1169 * If we issued read requests, let them complete.
1171 while (wait_bh
> wait
) {
1172 wait_on_buffer(*--wait_bh
);
1173 if (!buffer_uptodate(*wait_bh
))
1177 page_zero_new_buffers(page
, from
, to
);
1179 err
= fscrypt_decrypt_page(page
->mapping
->host
, page
,
1180 PAGE_SIZE
, 0, page
->index
);
1185 static int ext4_write_begin(struct file
*file
, struct address_space
*mapping
,
1186 loff_t pos
, unsigned len
, unsigned flags
,
1187 struct page
**pagep
, void **fsdata
)
1189 struct inode
*inode
= mapping
->host
;
1190 int ret
, needed_blocks
;
1197 trace_ext4_write_begin(inode
, pos
, len
, flags
);
1199 * Reserve one block more for addition to orphan list in case
1200 * we allocate blocks but write fails for some reason
1202 needed_blocks
= ext4_writepage_trans_blocks(inode
) + 1;
1203 index
= pos
>> PAGE_SHIFT
;
1204 from
= pos
& (PAGE_SIZE
- 1);
1207 if (ext4_test_inode_state(inode
, EXT4_STATE_MAY_INLINE_DATA
)) {
1208 ret
= ext4_try_to_write_inline_data(mapping
, inode
, pos
, len
,
1217 * grab_cache_page_write_begin() can take a long time if the
1218 * system is thrashing due to memory pressure, or if the page
1219 * is being written back. So grab it first before we start
1220 * the transaction handle. This also allows us to allocate
1221 * the page (if needed) without using GFP_NOFS.
1224 page
= grab_cache_page_write_begin(mapping
, index
, flags
);
1230 handle
= ext4_journal_start(inode
, EXT4_HT_WRITE_PAGE
, needed_blocks
);
1231 if (IS_ERR(handle
)) {
1233 return PTR_ERR(handle
);
1237 if (page
->mapping
!= mapping
) {
1238 /* The page got truncated from under us */
1241 ext4_journal_stop(handle
);
1244 /* In case writeback began while the page was unlocked */
1245 wait_for_stable_page(page
);
1247 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1248 if (ext4_should_dioread_nolock(inode
))
1249 ret
= ext4_block_write_begin(page
, pos
, len
,
1250 ext4_get_block_unwritten
);
1252 ret
= ext4_block_write_begin(page
, pos
, len
,
1255 if (ext4_should_dioread_nolock(inode
))
1256 ret
= __block_write_begin(page
, pos
, len
,
1257 ext4_get_block_unwritten
);
1259 ret
= __block_write_begin(page
, pos
, len
, ext4_get_block
);
1261 if (!ret
&& ext4_should_journal_data(inode
)) {
1262 ret
= ext4_walk_page_buffers(handle
, page_buffers(page
),
1264 do_journal_get_write_access
);
1270 * __block_write_begin may have instantiated a few blocks
1271 * outside i_size. Trim these off again. Don't need
1272 * i_size_read because we hold i_mutex.
1274 * Add inode to orphan list in case we crash before
1277 if (pos
+ len
> inode
->i_size
&& ext4_can_truncate(inode
))
1278 ext4_orphan_add(handle
, inode
);
1280 ext4_journal_stop(handle
);
1281 if (pos
+ len
> inode
->i_size
) {
1282 ext4_truncate_failed_write(inode
);
1284 * If truncate failed early the inode might
1285 * still be on the orphan list; we need to
1286 * make sure the inode is removed from the
1287 * orphan list in that case.
1290 ext4_orphan_del(NULL
, inode
);
1293 if (ret
== -ENOSPC
&&
1294 ext4_should_retry_alloc(inode
->i_sb
, &retries
))
1303 /* For write_end() in data=journal mode */
1304 static int write_end_fn(handle_t
*handle
, struct buffer_head
*bh
)
1307 if (!buffer_mapped(bh
) || buffer_freed(bh
))
1309 set_buffer_uptodate(bh
);
1310 ret
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
1311 clear_buffer_meta(bh
);
1312 clear_buffer_prio(bh
);
1317 * We need to pick up the new inode size which generic_commit_write gave us
1318 * `file' can be NULL - eg, when called from page_symlink().
1320 * ext4 never places buffers on inode->i_mapping->private_list. metadata
1321 * buffers are managed internally.
1323 static int ext4_write_end(struct file
*file
,
1324 struct address_space
*mapping
,
1325 loff_t pos
, unsigned len
, unsigned copied
,
1326 struct page
*page
, void *fsdata
)
1328 handle_t
*handle
= ext4_journal_current_handle();
1329 struct inode
*inode
= mapping
->host
;
1330 loff_t old_size
= inode
->i_size
;
1332 int i_size_changed
= 0;
1334 trace_ext4_write_end(inode
, pos
, len
, copied
);
1335 if (ext4_has_inline_data(inode
)) {
1336 ret
= ext4_write_inline_data_end(inode
, pos
, len
,
1342 copied
= block_write_end(file
, mapping
, pos
,
1343 len
, copied
, page
, fsdata
);
1345 * it's important to update i_size while still holding page lock:
1346 * page writeout could otherwise come in and zero beyond i_size.
1348 i_size_changed
= ext4_update_inode_size(inode
, pos
+ copied
);
1353 pagecache_isize_extended(inode
, old_size
, pos
);
1355 * Don't mark the inode dirty under page lock. First, it unnecessarily
1356 * makes the holding time of page lock longer. Second, it forces lock
1357 * ordering of page lock and transaction start for journaling
1361 ext4_mark_inode_dirty(handle
, inode
);
1363 if (pos
+ len
> inode
->i_size
&& ext4_can_truncate(inode
))
1364 /* if we have allocated more blocks and copied
1365 * less. We will have blocks allocated outside
1366 * inode->i_size. So truncate them
1368 ext4_orphan_add(handle
, inode
);
1370 ret2
= ext4_journal_stop(handle
);
1374 if (pos
+ len
> inode
->i_size
) {
1375 ext4_truncate_failed_write(inode
);
1377 * If truncate failed early the inode might still be
1378 * on the orphan list; we need to make sure the inode
1379 * is removed from the orphan list in that case.
1382 ext4_orphan_del(NULL
, inode
);
1385 return ret
? ret
: copied
;
1389 * This is a private version of page_zero_new_buffers() which doesn't
1390 * set the buffer to be dirty, since in data=journalled mode we need
1391 * to call ext4_handle_dirty_metadata() instead.
1393 static void zero_new_buffers(struct page
*page
, unsigned from
, unsigned to
)
1395 unsigned int block_start
= 0, block_end
;
1396 struct buffer_head
*head
, *bh
;
1398 bh
= head
= page_buffers(page
);
1400 block_end
= block_start
+ bh
->b_size
;
1401 if (buffer_new(bh
)) {
1402 if (block_end
> from
&& block_start
< to
) {
1403 if (!PageUptodate(page
)) {
1404 unsigned start
, size
;
1406 start
= max(from
, block_start
);
1407 size
= min(to
, block_end
) - start
;
1409 zero_user(page
, start
, size
);
1410 set_buffer_uptodate(bh
);
1412 clear_buffer_new(bh
);
1415 block_start
= block_end
;
1416 bh
= bh
->b_this_page
;
1417 } while (bh
!= head
);
1420 static int ext4_journalled_write_end(struct file
*file
,
1421 struct address_space
*mapping
,
1422 loff_t pos
, unsigned len
, unsigned copied
,
1423 struct page
*page
, void *fsdata
)
1425 handle_t
*handle
= ext4_journal_current_handle();
1426 struct inode
*inode
= mapping
->host
;
1427 loff_t old_size
= inode
->i_size
;
1431 int size_changed
= 0;
1433 trace_ext4_journalled_write_end(inode
, pos
, len
, copied
);
1434 from
= pos
& (PAGE_SIZE
- 1);
1437 BUG_ON(!ext4_handle_valid(handle
));
1439 if (ext4_has_inline_data(inode
))
1440 copied
= ext4_write_inline_data_end(inode
, pos
, len
,
1444 if (!PageUptodate(page
))
1446 zero_new_buffers(page
, from
+copied
, to
);
1449 ret
= ext4_walk_page_buffers(handle
, page_buffers(page
), from
,
1450 to
, &partial
, write_end_fn
);
1452 SetPageUptodate(page
);
1454 size_changed
= ext4_update_inode_size(inode
, pos
+ copied
);
1455 ext4_set_inode_state(inode
, EXT4_STATE_JDATA
);
1456 EXT4_I(inode
)->i_datasync_tid
= handle
->h_transaction
->t_tid
;
1461 pagecache_isize_extended(inode
, old_size
, pos
);
1464 ret2
= ext4_mark_inode_dirty(handle
, inode
);
1469 if (pos
+ len
> inode
->i_size
&& ext4_can_truncate(inode
))
1470 /* if we have allocated more blocks and copied
1471 * less. We will have blocks allocated outside
1472 * inode->i_size. So truncate them
1474 ext4_orphan_add(handle
, inode
);
1476 ret2
= ext4_journal_stop(handle
);
1479 if (pos
+ len
> inode
->i_size
) {
1480 ext4_truncate_failed_write(inode
);
1482 * If truncate failed early the inode might still be
1483 * on the orphan list; we need to make sure the inode
1484 * is removed from the orphan list in that case.
1487 ext4_orphan_del(NULL
, inode
);
1490 return ret
? ret
: copied
;
1494 * Reserve space for a single cluster
1496 static int ext4_da_reserve_space(struct inode
*inode
)
1498 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
1499 struct ext4_inode_info
*ei
= EXT4_I(inode
);
1503 * We will charge metadata quota at writeout time; this saves
1504 * us from metadata over-estimation, though we may go over by
1505 * a small amount in the end. Here we just reserve for data.
1507 ret
= dquot_reserve_block(inode
, EXT4_C2B(sbi
, 1));
1511 spin_lock(&ei
->i_block_reservation_lock
);
1512 if (ext4_claim_free_clusters(sbi
, 1, 0)) {
1513 spin_unlock(&ei
->i_block_reservation_lock
);
1514 dquot_release_reservation_block(inode
, EXT4_C2B(sbi
, 1));
1517 ei
->i_reserved_data_blocks
++;
1518 trace_ext4_da_reserve_space(inode
);
1519 spin_unlock(&ei
->i_block_reservation_lock
);
1521 return 0; /* success */
1524 static void ext4_da_release_space(struct inode
*inode
, int to_free
)
1526 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
1527 struct ext4_inode_info
*ei
= EXT4_I(inode
);
1530 return; /* Nothing to release, exit */
1532 spin_lock(&EXT4_I(inode
)->i_block_reservation_lock
);
1534 trace_ext4_da_release_space(inode
, to_free
);
1535 if (unlikely(to_free
> ei
->i_reserved_data_blocks
)) {
1537 * if there aren't enough reserved blocks, then the
1538 * counter is messed up somewhere. Since this
1539 * function is called from invalidate page, it's
1540 * harmless to return without any action.
1542 ext4_warning(inode
->i_sb
, "ext4_da_release_space: "
1543 "ino %lu, to_free %d with only %d reserved "
1544 "data blocks", inode
->i_ino
, to_free
,
1545 ei
->i_reserved_data_blocks
);
1547 to_free
= ei
->i_reserved_data_blocks
;
1549 ei
->i_reserved_data_blocks
-= to_free
;
1551 /* update fs dirty data blocks counter */
1552 percpu_counter_sub(&sbi
->s_dirtyclusters_counter
, to_free
);
1554 spin_unlock(&EXT4_I(inode
)->i_block_reservation_lock
);
1556 dquot_release_reservation_block(inode
, EXT4_C2B(sbi
, to_free
));
1559 static void ext4_da_page_release_reservation(struct page
*page
,
1560 unsigned int offset
,
1561 unsigned int length
)
1563 int to_release
= 0, contiguous_blks
= 0;
1564 struct buffer_head
*head
, *bh
;
1565 unsigned int curr_off
= 0;
1566 struct inode
*inode
= page
->mapping
->host
;
1567 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
1568 unsigned int stop
= offset
+ length
;
1572 BUG_ON(stop
> PAGE_SIZE
|| stop
< length
);
1574 head
= page_buffers(page
);
1577 unsigned int next_off
= curr_off
+ bh
->b_size
;
1579 if (next_off
> stop
)
1582 if ((offset
<= curr_off
) && (buffer_delay(bh
))) {
1585 clear_buffer_delay(bh
);
1586 } else if (contiguous_blks
) {
1587 lblk
= page
->index
<<
1588 (PAGE_SHIFT
- inode
->i_blkbits
);
1589 lblk
+= (curr_off
>> inode
->i_blkbits
) -
1591 ext4_es_remove_extent(inode
, lblk
, contiguous_blks
);
1592 contiguous_blks
= 0;
1594 curr_off
= next_off
;
1595 } while ((bh
= bh
->b_this_page
) != head
);
1597 if (contiguous_blks
) {
1598 lblk
= page
->index
<< (PAGE_SHIFT
- inode
->i_blkbits
);
1599 lblk
+= (curr_off
>> inode
->i_blkbits
) - contiguous_blks
;
1600 ext4_es_remove_extent(inode
, lblk
, contiguous_blks
);
1603 /* If we have released all the blocks belonging to a cluster, then we
1604 * need to release the reserved space for that cluster. */
1605 num_clusters
= EXT4_NUM_B2C(sbi
, to_release
);
1606 while (num_clusters
> 0) {
1607 lblk
= (page
->index
<< (PAGE_SHIFT
- inode
->i_blkbits
)) +
1608 ((num_clusters
- 1) << sbi
->s_cluster_bits
);
1609 if (sbi
->s_cluster_ratio
== 1 ||
1610 !ext4_find_delalloc_cluster(inode
, lblk
))
1611 ext4_da_release_space(inode
, 1);
1618 * Delayed allocation stuff
1621 struct mpage_da_data
{
1622 struct inode
*inode
;
1623 struct writeback_control
*wbc
;
1625 pgoff_t first_page
; /* The first page to write */
1626 pgoff_t next_page
; /* Current page to examine */
1627 pgoff_t last_page
; /* Last page to examine */
1629 * Extent to map - this can be after first_page because that can be
1630 * fully mapped. We somewhat abuse m_flags to store whether the extent
1631 * is delalloc or unwritten.
1633 struct ext4_map_blocks map
;
1634 struct ext4_io_submit io_submit
; /* IO submission data */
1637 static void mpage_release_unused_pages(struct mpage_da_data
*mpd
,
1642 struct pagevec pvec
;
1643 struct inode
*inode
= mpd
->inode
;
1644 struct address_space
*mapping
= inode
->i_mapping
;
1646 /* This is necessary when next_page == 0. */
1647 if (mpd
->first_page
>= mpd
->next_page
)
1650 index
= mpd
->first_page
;
1651 end
= mpd
->next_page
- 1;
1653 ext4_lblk_t start
, last
;
1654 start
= index
<< (PAGE_SHIFT
- inode
->i_blkbits
);
1655 last
= end
<< (PAGE_SHIFT
- inode
->i_blkbits
);
1656 ext4_es_remove_extent(inode
, start
, last
- start
+ 1);
1659 pagevec_init(&pvec
, 0);
1660 while (index
<= end
) {
1661 nr_pages
= pagevec_lookup(&pvec
, mapping
, index
, PAGEVEC_SIZE
);
1664 for (i
= 0; i
< nr_pages
; i
++) {
1665 struct page
*page
= pvec
.pages
[i
];
1666 if (page
->index
> end
)
1668 BUG_ON(!PageLocked(page
));
1669 BUG_ON(PageWriteback(page
));
1671 if (page_mapped(page
))
1672 clear_page_dirty_for_io(page
);
1673 block_invalidatepage(page
, 0, PAGE_SIZE
);
1674 ClearPageUptodate(page
);
1678 index
= pvec
.pages
[nr_pages
- 1]->index
+ 1;
1679 pagevec_release(&pvec
);
1683 static void ext4_print_free_blocks(struct inode
*inode
)
1685 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
1686 struct super_block
*sb
= inode
->i_sb
;
1687 struct ext4_inode_info
*ei
= EXT4_I(inode
);
1689 ext4_msg(sb
, KERN_CRIT
, "Total free blocks count %lld",
1690 EXT4_C2B(EXT4_SB(inode
->i_sb
),
1691 ext4_count_free_clusters(sb
)));
1692 ext4_msg(sb
, KERN_CRIT
, "Free/Dirty block details");
1693 ext4_msg(sb
, KERN_CRIT
, "free_blocks=%lld",
1694 (long long) EXT4_C2B(EXT4_SB(sb
),
1695 percpu_counter_sum(&sbi
->s_freeclusters_counter
)));
1696 ext4_msg(sb
, KERN_CRIT
, "dirty_blocks=%lld",
1697 (long long) EXT4_C2B(EXT4_SB(sb
),
1698 percpu_counter_sum(&sbi
->s_dirtyclusters_counter
)));
1699 ext4_msg(sb
, KERN_CRIT
, "Block reservation details");
1700 ext4_msg(sb
, KERN_CRIT
, "i_reserved_data_blocks=%u",
1701 ei
->i_reserved_data_blocks
);
1705 static int ext4_bh_delay_or_unwritten(handle_t
*handle
, struct buffer_head
*bh
)
1707 return (buffer_delay(bh
) || buffer_unwritten(bh
)) && buffer_dirty(bh
);
1711 * This function is grabs code from the very beginning of
1712 * ext4_map_blocks, but assumes that the caller is from delayed write
1713 * time. This function looks up the requested blocks and sets the
1714 * buffer delay bit under the protection of i_data_sem.
1716 static int ext4_da_map_blocks(struct inode
*inode
, sector_t iblock
,
1717 struct ext4_map_blocks
*map
,
1718 struct buffer_head
*bh
)
1720 struct extent_status es
;
1722 sector_t invalid_block
= ~((sector_t
) 0xffff);
1723 #ifdef ES_AGGRESSIVE_TEST
1724 struct ext4_map_blocks orig_map
;
1726 memcpy(&orig_map
, map
, sizeof(*map
));
1729 if (invalid_block
< ext4_blocks_count(EXT4_SB(inode
->i_sb
)->s_es
))
1733 ext_debug("ext4_da_map_blocks(): inode %lu, max_blocks %u,"
1734 "logical block %lu\n", inode
->i_ino
, map
->m_len
,
1735 (unsigned long) map
->m_lblk
);
1737 /* Lookup extent status tree firstly */
1738 if (ext4_es_lookup_extent(inode
, iblock
, &es
)) {
1739 if (ext4_es_is_hole(&es
)) {
1741 down_read(&EXT4_I(inode
)->i_data_sem
);
1746 * Delayed extent could be allocated by fallocate.
1747 * So we need to check it.
1749 if (ext4_es_is_delayed(&es
) && !ext4_es_is_unwritten(&es
)) {
1750 map_bh(bh
, inode
->i_sb
, invalid_block
);
1752 set_buffer_delay(bh
);
1756 map
->m_pblk
= ext4_es_pblock(&es
) + iblock
- es
.es_lblk
;
1757 retval
= es
.es_len
- (iblock
- es
.es_lblk
);
1758 if (retval
> map
->m_len
)
1759 retval
= map
->m_len
;
1760 map
->m_len
= retval
;
1761 if (ext4_es_is_written(&es
))
1762 map
->m_flags
|= EXT4_MAP_MAPPED
;
1763 else if (ext4_es_is_unwritten(&es
))
1764 map
->m_flags
|= EXT4_MAP_UNWRITTEN
;
1768 #ifdef ES_AGGRESSIVE_TEST
1769 ext4_map_blocks_es_recheck(NULL
, inode
, map
, &orig_map
, 0);
1775 * Try to see if we can get the block without requesting a new
1776 * file system block.
1778 down_read(&EXT4_I(inode
)->i_data_sem
);
1779 if (ext4_has_inline_data(inode
))
1781 else if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))
1782 retval
= ext4_ext_map_blocks(NULL
, inode
, map
, 0);
1784 retval
= ext4_ind_map_blocks(NULL
, inode
, map
, 0);
1790 * XXX: __block_prepare_write() unmaps passed block,
1794 * If the block was allocated from previously allocated cluster,
1795 * then we don't need to reserve it again. However we still need
1796 * to reserve metadata for every block we're going to write.
1798 if (EXT4_SB(inode
->i_sb
)->s_cluster_ratio
== 1 ||
1799 !ext4_find_delalloc_cluster(inode
, map
->m_lblk
)) {
1800 ret
= ext4_da_reserve_space(inode
);
1802 /* not enough space to reserve */
1808 ret
= ext4_es_insert_extent(inode
, map
->m_lblk
, map
->m_len
,
1809 ~0, EXTENT_STATUS_DELAYED
);
1815 map_bh(bh
, inode
->i_sb
, invalid_block
);
1817 set_buffer_delay(bh
);
1818 } else if (retval
> 0) {
1820 unsigned int status
;
1822 if (unlikely(retval
!= map
->m_len
)) {
1823 ext4_warning(inode
->i_sb
,
1824 "ES len assertion failed for inode "
1825 "%lu: retval %d != map->m_len %d",
1826 inode
->i_ino
, retval
, map
->m_len
);
1830 status
= map
->m_flags
& EXT4_MAP_UNWRITTEN
?
1831 EXTENT_STATUS_UNWRITTEN
: EXTENT_STATUS_WRITTEN
;
1832 ret
= ext4_es_insert_extent(inode
, map
->m_lblk
, map
->m_len
,
1833 map
->m_pblk
, status
);
1839 up_read((&EXT4_I(inode
)->i_data_sem
));
1845 * This is a special get_block_t callback which is used by
1846 * ext4_da_write_begin(). It will either return mapped block or
1847 * reserve space for a single block.
1849 * For delayed buffer_head we have BH_Mapped, BH_New, BH_Delay set.
1850 * We also have b_blocknr = -1 and b_bdev initialized properly
1852 * For unwritten buffer_head we have BH_Mapped, BH_New, BH_Unwritten set.
1853 * We also have b_blocknr = physicalblock mapping unwritten extent and b_bdev
1854 * initialized properly.
1856 int ext4_da_get_block_prep(struct inode
*inode
, sector_t iblock
,
1857 struct buffer_head
*bh
, int create
)
1859 struct ext4_map_blocks map
;
1862 BUG_ON(create
== 0);
1863 BUG_ON(bh
->b_size
!= inode
->i_sb
->s_blocksize
);
1865 map
.m_lblk
= iblock
;
1869 * first, we need to know whether the block is allocated already
1870 * preallocated blocks are unmapped but should treated
1871 * the same as allocated blocks.
1873 ret
= ext4_da_map_blocks(inode
, iblock
, &map
, bh
);
1877 map_bh(bh
, inode
->i_sb
, map
.m_pblk
);
1878 ext4_update_bh_state(bh
, map
.m_flags
);
1880 if (buffer_unwritten(bh
)) {
1881 /* A delayed write to unwritten bh should be marked
1882 * new and mapped. Mapped ensures that we don't do
1883 * get_block multiple times when we write to the same
1884 * offset and new ensures that we do proper zero out
1885 * for partial write.
1888 set_buffer_mapped(bh
);
1893 static int bget_one(handle_t
*handle
, struct buffer_head
*bh
)
1899 static int bput_one(handle_t
*handle
, struct buffer_head
*bh
)
1905 static int __ext4_journalled_writepage(struct page
*page
,
1908 struct address_space
*mapping
= page
->mapping
;
1909 struct inode
*inode
= mapping
->host
;
1910 struct buffer_head
*page_bufs
= NULL
;
1911 handle_t
*handle
= NULL
;
1912 int ret
= 0, err
= 0;
1913 int inline_data
= ext4_has_inline_data(inode
);
1914 struct buffer_head
*inode_bh
= NULL
;
1916 ClearPageChecked(page
);
1919 BUG_ON(page
->index
!= 0);
1920 BUG_ON(len
> ext4_get_max_inline_size(inode
));
1921 inode_bh
= ext4_journalled_write_inline_data(inode
, len
, page
);
1922 if (inode_bh
== NULL
)
1925 page_bufs
= page_buffers(page
);
1930 ext4_walk_page_buffers(handle
, page_bufs
, 0, len
,
1934 * We need to release the page lock before we start the
1935 * journal, so grab a reference so the page won't disappear
1936 * out from under us.
1941 handle
= ext4_journal_start(inode
, EXT4_HT_WRITE_PAGE
,
1942 ext4_writepage_trans_blocks(inode
));
1943 if (IS_ERR(handle
)) {
1944 ret
= PTR_ERR(handle
);
1946 goto out_no_pagelock
;
1948 BUG_ON(!ext4_handle_valid(handle
));
1952 if (page
->mapping
!= mapping
) {
1953 /* The page got truncated from under us */
1954 ext4_journal_stop(handle
);
1960 BUFFER_TRACE(inode_bh
, "get write access");
1961 ret
= ext4_journal_get_write_access(handle
, inode_bh
);
1963 err
= ext4_handle_dirty_metadata(handle
, inode
, inode_bh
);
1966 ret
= ext4_walk_page_buffers(handle
, page_bufs
, 0, len
, NULL
,
1967 do_journal_get_write_access
);
1969 err
= ext4_walk_page_buffers(handle
, page_bufs
, 0, len
, NULL
,
1974 EXT4_I(inode
)->i_datasync_tid
= handle
->h_transaction
->t_tid
;
1975 err
= ext4_journal_stop(handle
);
1979 if (!ext4_has_inline_data(inode
))
1980 ext4_walk_page_buffers(NULL
, page_bufs
, 0, len
,
1982 ext4_set_inode_state(inode
, EXT4_STATE_JDATA
);
1991 * Note that we don't need to start a transaction unless we're journaling data
1992 * because we should have holes filled from ext4_page_mkwrite(). We even don't
1993 * need to file the inode to the transaction's list in ordered mode because if
1994 * we are writing back data added by write(), the inode is already there and if
1995 * we are writing back data modified via mmap(), no one guarantees in which
1996 * transaction the data will hit the disk. In case we are journaling data, we
1997 * cannot start transaction directly because transaction start ranks above page
1998 * lock so we have to do some magic.
2000 * This function can get called via...
2001 * - ext4_writepages after taking page lock (have journal handle)
2002 * - journal_submit_inode_data_buffers (no journal handle)
2003 * - shrink_page_list via the kswapd/direct reclaim (no journal handle)
2004 * - grab_page_cache when doing write_begin (have journal handle)
2006 * We don't do any block allocation in this function. If we have page with
2007 * multiple blocks we need to write those buffer_heads that are mapped. This
2008 * is important for mmaped based write. So if we do with blocksize 1K
2009 * truncate(f, 1024);
2010 * a = mmap(f, 0, 4096);
2012 * truncate(f, 4096);
2013 * we have in the page first buffer_head mapped via page_mkwrite call back
2014 * but other buffer_heads would be unmapped but dirty (dirty done via the
2015 * do_wp_page). So writepage should write the first block. If we modify
2016 * the mmap area beyond 1024 we will again get a page_fault and the
2017 * page_mkwrite callback will do the block allocation and mark the
2018 * buffer_heads mapped.
2020 * We redirty the page if we have any buffer_heads that is either delay or
2021 * unwritten in the page.
2023 * We can get recursively called as show below.
2025 * ext4_writepage() -> kmalloc() -> __alloc_pages() -> page_launder() ->
2028 * But since we don't do any block allocation we should not deadlock.
2029 * Page also have the dirty flag cleared so we don't get recurive page_lock.
2031 static int ext4_writepage(struct page
*page
,
2032 struct writeback_control
*wbc
)
2037 struct buffer_head
*page_bufs
= NULL
;
2038 struct inode
*inode
= page
->mapping
->host
;
2039 struct ext4_io_submit io_submit
;
2040 bool keep_towrite
= false;
2042 trace_ext4_writepage(page
);
2043 size
= i_size_read(inode
);
2044 if (page
->index
== size
>> PAGE_SHIFT
)
2045 len
= size
& ~PAGE_MASK
;
2049 page_bufs
= page_buffers(page
);
2051 * We cannot do block allocation or other extent handling in this
2052 * function. If there are buffers needing that, we have to redirty
2053 * the page. But we may reach here when we do a journal commit via
2054 * journal_submit_inode_data_buffers() and in that case we must write
2055 * allocated buffers to achieve data=ordered mode guarantees.
2057 * Also, if there is only one buffer per page (the fs block
2058 * size == the page size), if one buffer needs block
2059 * allocation or needs to modify the extent tree to clear the
2060 * unwritten flag, we know that the page can't be written at
2061 * all, so we might as well refuse the write immediately.
2062 * Unfortunately if the block size != page size, we can't as
2063 * easily detect this case using ext4_walk_page_buffers(), but
2064 * for the extremely common case, this is an optimization that
2065 * skips a useless round trip through ext4_bio_write_page().
2067 if (ext4_walk_page_buffers(NULL
, page_bufs
, 0, len
, NULL
,
2068 ext4_bh_delay_or_unwritten
)) {
2069 redirty_page_for_writepage(wbc
, page
);
2070 if ((current
->flags
& PF_MEMALLOC
) ||
2071 (inode
->i_sb
->s_blocksize
== PAGE_SIZE
)) {
2073 * For memory cleaning there's no point in writing only
2074 * some buffers. So just bail out. Warn if we came here
2075 * from direct reclaim.
2077 WARN_ON_ONCE((current
->flags
& (PF_MEMALLOC
|PF_KSWAPD
))
2082 keep_towrite
= true;
2085 if (PageChecked(page
) && ext4_should_journal_data(inode
))
2087 * It's mmapped pagecache. Add buffers and journal it. There
2088 * doesn't seem much point in redirtying the page here.
2090 return __ext4_journalled_writepage(page
, len
);
2092 ext4_io_submit_init(&io_submit
, wbc
);
2093 io_submit
.io_end
= ext4_init_io_end(inode
, GFP_NOFS
);
2094 if (!io_submit
.io_end
) {
2095 redirty_page_for_writepage(wbc
, page
);
2099 ret
= ext4_bio_write_page(&io_submit
, page
, len
, wbc
, keep_towrite
);
2100 ext4_io_submit(&io_submit
);
2101 /* Drop io_end reference we got from init */
2102 ext4_put_io_end_defer(io_submit
.io_end
);
2106 static int mpage_submit_page(struct mpage_da_data
*mpd
, struct page
*page
)
2109 loff_t size
= i_size_read(mpd
->inode
);
2112 BUG_ON(page
->index
!= mpd
->first_page
);
2113 if (page
->index
== size
>> PAGE_SHIFT
)
2114 len
= size
& ~PAGE_MASK
;
2117 clear_page_dirty_for_io(page
);
2118 err
= ext4_bio_write_page(&mpd
->io_submit
, page
, len
, mpd
->wbc
, false);
2120 mpd
->wbc
->nr_to_write
--;
2126 #define BH_FLAGS ((1 << BH_Unwritten) | (1 << BH_Delay))
2129 * mballoc gives us at most this number of blocks...
2130 * XXX: That seems to be only a limitation of ext4_mb_normalize_request().
2131 * The rest of mballoc seems to handle chunks up to full group size.
2133 #define MAX_WRITEPAGES_EXTENT_LEN 2048
2136 * mpage_add_bh_to_extent - try to add bh to extent of blocks to map
2138 * @mpd - extent of blocks
2139 * @lblk - logical number of the block in the file
2140 * @bh - buffer head we want to add to the extent
2142 * The function is used to collect contig. blocks in the same state. If the
2143 * buffer doesn't require mapping for writeback and we haven't started the
2144 * extent of buffers to map yet, the function returns 'true' immediately - the
2145 * caller can write the buffer right away. Otherwise the function returns true
2146 * if the block has been added to the extent, false if the block couldn't be
2149 static bool mpage_add_bh_to_extent(struct mpage_da_data
*mpd
, ext4_lblk_t lblk
,
2150 struct buffer_head
*bh
)
2152 struct ext4_map_blocks
*map
= &mpd
->map
;
2154 /* Buffer that doesn't need mapping for writeback? */
2155 if (!buffer_dirty(bh
) || !buffer_mapped(bh
) ||
2156 (!buffer_delay(bh
) && !buffer_unwritten(bh
))) {
2157 /* So far no extent to map => we write the buffer right away */
2158 if (map
->m_len
== 0)
2163 /* First block in the extent? */
2164 if (map
->m_len
== 0) {
2167 map
->m_flags
= bh
->b_state
& BH_FLAGS
;
2171 /* Don't go larger than mballoc is willing to allocate */
2172 if (map
->m_len
>= MAX_WRITEPAGES_EXTENT_LEN
)
2175 /* Can we merge the block to our big extent? */
2176 if (lblk
== map
->m_lblk
+ map
->m_len
&&
2177 (bh
->b_state
& BH_FLAGS
) == map
->m_flags
) {
2185 * mpage_process_page_bufs - submit page buffers for IO or add them to extent
2187 * @mpd - extent of blocks for mapping
2188 * @head - the first buffer in the page
2189 * @bh - buffer we should start processing from
2190 * @lblk - logical number of the block in the file corresponding to @bh
2192 * Walk through page buffers from @bh upto @head (exclusive) and either submit
2193 * the page for IO if all buffers in this page were mapped and there's no
2194 * accumulated extent of buffers to map or add buffers in the page to the
2195 * extent of buffers to map. The function returns 1 if the caller can continue
2196 * by processing the next page, 0 if it should stop adding buffers to the
2197 * extent to map because we cannot extend it anymore. It can also return value
2198 * < 0 in case of error during IO submission.
2200 static int mpage_process_page_bufs(struct mpage_da_data
*mpd
,
2201 struct buffer_head
*head
,
2202 struct buffer_head
*bh
,
2205 struct inode
*inode
= mpd
->inode
;
2207 ext4_lblk_t blocks
= (i_size_read(inode
) + (1 << inode
->i_blkbits
) - 1)
2208 >> inode
->i_blkbits
;
2211 BUG_ON(buffer_locked(bh
));
2213 if (lblk
>= blocks
|| !mpage_add_bh_to_extent(mpd
, lblk
, bh
)) {
2214 /* Found extent to map? */
2217 /* Everything mapped so far and we hit EOF */
2220 } while (lblk
++, (bh
= bh
->b_this_page
) != head
);
2221 /* So far everything mapped? Submit the page for IO. */
2222 if (mpd
->map
.m_len
== 0) {
2223 err
= mpage_submit_page(mpd
, head
->b_page
);
2227 return lblk
< blocks
;
2231 * mpage_map_buffers - update buffers corresponding to changed extent and
2232 * submit fully mapped pages for IO
2234 * @mpd - description of extent to map, on return next extent to map
2236 * Scan buffers corresponding to changed extent (we expect corresponding pages
2237 * to be already locked) and update buffer state according to new extent state.
2238 * We map delalloc buffers to their physical location, clear unwritten bits,
2239 * and mark buffers as uninit when we perform writes to unwritten extents
2240 * and do extent conversion after IO is finished. If the last page is not fully
2241 * mapped, we update @map to the next extent in the last page that needs
2242 * mapping. Otherwise we submit the page for IO.
2244 static int mpage_map_and_submit_buffers(struct mpage_da_data
*mpd
)
2246 struct pagevec pvec
;
2248 struct inode
*inode
= mpd
->inode
;
2249 struct buffer_head
*head
, *bh
;
2250 int bpp_bits
= PAGE_SHIFT
- inode
->i_blkbits
;
2256 start
= mpd
->map
.m_lblk
>> bpp_bits
;
2257 end
= (mpd
->map
.m_lblk
+ mpd
->map
.m_len
- 1) >> bpp_bits
;
2258 lblk
= start
<< bpp_bits
;
2259 pblock
= mpd
->map
.m_pblk
;
2261 pagevec_init(&pvec
, 0);
2262 while (start
<= end
) {
2263 nr_pages
= pagevec_lookup(&pvec
, inode
->i_mapping
, start
,
2267 for (i
= 0; i
< nr_pages
; i
++) {
2268 struct page
*page
= pvec
.pages
[i
];
2270 if (page
->index
> end
)
2272 /* Up to 'end' pages must be contiguous */
2273 BUG_ON(page
->index
!= start
);
2274 bh
= head
= page_buffers(page
);
2276 if (lblk
< mpd
->map
.m_lblk
)
2278 if (lblk
>= mpd
->map
.m_lblk
+ mpd
->map
.m_len
) {
2280 * Buffer after end of mapped extent.
2281 * Find next buffer in the page to map.
2284 mpd
->map
.m_flags
= 0;
2286 * FIXME: If dioread_nolock supports
2287 * blocksize < pagesize, we need to make
2288 * sure we add size mapped so far to
2289 * io_end->size as the following call
2290 * can submit the page for IO.
2292 err
= mpage_process_page_bufs(mpd
, head
,
2294 pagevec_release(&pvec
);
2299 if (buffer_delay(bh
)) {
2300 clear_buffer_delay(bh
);
2301 bh
->b_blocknr
= pblock
++;
2303 clear_buffer_unwritten(bh
);
2304 } while (lblk
++, (bh
= bh
->b_this_page
) != head
);
2307 * FIXME: This is going to break if dioread_nolock
2308 * supports blocksize < pagesize as we will try to
2309 * convert potentially unmapped parts of inode.
2311 mpd
->io_submit
.io_end
->size
+= PAGE_SIZE
;
2312 /* Page fully mapped - let IO run! */
2313 err
= mpage_submit_page(mpd
, page
);
2315 pagevec_release(&pvec
);
2320 pagevec_release(&pvec
);
2322 /* Extent fully mapped and matches with page boundary. We are done. */
2324 mpd
->map
.m_flags
= 0;
2328 static int mpage_map_one_extent(handle_t
*handle
, struct mpage_da_data
*mpd
)
2330 struct inode
*inode
= mpd
->inode
;
2331 struct ext4_map_blocks
*map
= &mpd
->map
;
2332 int get_blocks_flags
;
2333 int err
, dioread_nolock
;
2335 trace_ext4_da_write_pages_extent(inode
, map
);
2337 * Call ext4_map_blocks() to allocate any delayed allocation blocks, or
2338 * to convert an unwritten extent to be initialized (in the case
2339 * where we have written into one or more preallocated blocks). It is
2340 * possible that we're going to need more metadata blocks than
2341 * previously reserved. However we must not fail because we're in
2342 * writeback and there is nothing we can do about it so it might result
2343 * in data loss. So use reserved blocks to allocate metadata if
2346 * We pass in the magic EXT4_GET_BLOCKS_DELALLOC_RESERVE if
2347 * the blocks in question are delalloc blocks. This indicates
2348 * that the blocks and quotas has already been checked when
2349 * the data was copied into the page cache.
2351 get_blocks_flags
= EXT4_GET_BLOCKS_CREATE
|
2352 EXT4_GET_BLOCKS_METADATA_NOFAIL
|
2353 EXT4_GET_BLOCKS_IO_SUBMIT
;
2354 dioread_nolock
= ext4_should_dioread_nolock(inode
);
2356 get_blocks_flags
|= EXT4_GET_BLOCKS_IO_CREATE_EXT
;
2357 if (map
->m_flags
& (1 << BH_Delay
))
2358 get_blocks_flags
|= EXT4_GET_BLOCKS_DELALLOC_RESERVE
;
2360 err
= ext4_map_blocks(handle
, inode
, map
, get_blocks_flags
);
2363 if (dioread_nolock
&& (map
->m_flags
& EXT4_MAP_UNWRITTEN
)) {
2364 if (!mpd
->io_submit
.io_end
->handle
&&
2365 ext4_handle_valid(handle
)) {
2366 mpd
->io_submit
.io_end
->handle
= handle
->h_rsv_handle
;
2367 handle
->h_rsv_handle
= NULL
;
2369 ext4_set_io_unwritten_flag(inode
, mpd
->io_submit
.io_end
);
2372 BUG_ON(map
->m_len
== 0);
2373 if (map
->m_flags
& EXT4_MAP_NEW
) {
2374 struct block_device
*bdev
= inode
->i_sb
->s_bdev
;
2377 for (i
= 0; i
< map
->m_len
; i
++)
2378 unmap_underlying_metadata(bdev
, map
->m_pblk
+ i
);
2384 * mpage_map_and_submit_extent - map extent starting at mpd->lblk of length
2385 * mpd->len and submit pages underlying it for IO
2387 * @handle - handle for journal operations
2388 * @mpd - extent to map
2389 * @give_up_on_write - we set this to true iff there is a fatal error and there
2390 * is no hope of writing the data. The caller should discard
2391 * dirty pages to avoid infinite loops.
2393 * The function maps extent starting at mpd->lblk of length mpd->len. If it is
2394 * delayed, blocks are allocated, if it is unwritten, we may need to convert
2395 * them to initialized or split the described range from larger unwritten
2396 * extent. Note that we need not map all the described range since allocation
2397 * can return less blocks or the range is covered by more unwritten extents. We
2398 * cannot map more because we are limited by reserved transaction credits. On
2399 * the other hand we always make sure that the last touched page is fully
2400 * mapped so that it can be written out (and thus forward progress is
2401 * guaranteed). After mapping we submit all mapped pages for IO.
2403 static int mpage_map_and_submit_extent(handle_t
*handle
,
2404 struct mpage_da_data
*mpd
,
2405 bool *give_up_on_write
)
2407 struct inode
*inode
= mpd
->inode
;
2408 struct ext4_map_blocks
*map
= &mpd
->map
;
2413 mpd
->io_submit
.io_end
->offset
=
2414 ((loff_t
)map
->m_lblk
) << inode
->i_blkbits
;
2416 err
= mpage_map_one_extent(handle
, mpd
);
2418 struct super_block
*sb
= inode
->i_sb
;
2420 if (EXT4_SB(sb
)->s_mount_flags
& EXT4_MF_FS_ABORTED
)
2421 goto invalidate_dirty_pages
;
2423 * Let the uper layers retry transient errors.
2424 * In the case of ENOSPC, if ext4_count_free_blocks()
2425 * is non-zero, a commit should free up blocks.
2427 if ((err
== -ENOMEM
) ||
2428 (err
== -ENOSPC
&& ext4_count_free_clusters(sb
))) {
2430 goto update_disksize
;
2433 ext4_msg(sb
, KERN_CRIT
,
2434 "Delayed block allocation failed for "
2435 "inode %lu at logical offset %llu with"
2436 " max blocks %u with error %d",
2438 (unsigned long long)map
->m_lblk
,
2439 (unsigned)map
->m_len
, -err
);
2440 ext4_msg(sb
, KERN_CRIT
,
2441 "This should not happen!! Data will "
2444 ext4_print_free_blocks(inode
);
2445 invalidate_dirty_pages
:
2446 *give_up_on_write
= true;
2451 * Update buffer state, submit mapped pages, and get us new
2454 err
= mpage_map_and_submit_buffers(mpd
);
2456 goto update_disksize
;
2457 } while (map
->m_len
);
2461 * Update on-disk size after IO is submitted. Races with
2462 * truncate are avoided by checking i_size under i_data_sem.
2464 disksize
= ((loff_t
)mpd
->first_page
) << PAGE_SHIFT
;
2465 if (disksize
> EXT4_I(inode
)->i_disksize
) {
2469 down_write(&EXT4_I(inode
)->i_data_sem
);
2470 i_size
= i_size_read(inode
);
2471 if (disksize
> i_size
)
2473 if (disksize
> EXT4_I(inode
)->i_disksize
)
2474 EXT4_I(inode
)->i_disksize
= disksize
;
2475 err2
= ext4_mark_inode_dirty(handle
, inode
);
2476 up_write(&EXT4_I(inode
)->i_data_sem
);
2478 ext4_error(inode
->i_sb
,
2479 "Failed to mark inode %lu dirty",
2488 * Calculate the total number of credits to reserve for one writepages
2489 * iteration. This is called from ext4_writepages(). We map an extent of
2490 * up to MAX_WRITEPAGES_EXTENT_LEN blocks and then we go on and finish mapping
2491 * the last partial page. So in total we can map MAX_WRITEPAGES_EXTENT_LEN +
2492 * bpp - 1 blocks in bpp different extents.
2494 static int ext4_da_writepages_trans_blocks(struct inode
*inode
)
2496 int bpp
= ext4_journal_blocks_per_page(inode
);
2498 return ext4_meta_trans_blocks(inode
,
2499 MAX_WRITEPAGES_EXTENT_LEN
+ bpp
- 1, bpp
);
2503 * mpage_prepare_extent_to_map - find & lock contiguous range of dirty pages
2504 * and underlying extent to map
2506 * @mpd - where to look for pages
2508 * Walk dirty pages in the mapping. If they are fully mapped, submit them for
2509 * IO immediately. When we find a page which isn't mapped we start accumulating
2510 * extent of buffers underlying these pages that needs mapping (formed by
2511 * either delayed or unwritten buffers). We also lock the pages containing
2512 * these buffers. The extent found is returned in @mpd structure (starting at
2513 * mpd->lblk with length mpd->len blocks).
2515 * Note that this function can attach bios to one io_end structure which are
2516 * neither logically nor physically contiguous. Although it may seem as an
2517 * unnecessary complication, it is actually inevitable in blocksize < pagesize
2518 * case as we need to track IO to all buffers underlying a page in one io_end.
2520 static int mpage_prepare_extent_to_map(struct mpage_da_data
*mpd
)
2522 struct address_space
*mapping
= mpd
->inode
->i_mapping
;
2523 struct pagevec pvec
;
2524 unsigned int nr_pages
;
2525 long left
= mpd
->wbc
->nr_to_write
;
2526 pgoff_t index
= mpd
->first_page
;
2527 pgoff_t end
= mpd
->last_page
;
2530 int blkbits
= mpd
->inode
->i_blkbits
;
2532 struct buffer_head
*head
;
2534 if (mpd
->wbc
->sync_mode
== WB_SYNC_ALL
|| mpd
->wbc
->tagged_writepages
)
2535 tag
= PAGECACHE_TAG_TOWRITE
;
2537 tag
= PAGECACHE_TAG_DIRTY
;
2539 pagevec_init(&pvec
, 0);
2541 mpd
->next_page
= index
;
2542 while (index
<= end
) {
2543 nr_pages
= pagevec_lookup_tag(&pvec
, mapping
, &index
, tag
,
2544 min(end
- index
, (pgoff_t
)PAGEVEC_SIZE
-1) + 1);
2548 for (i
= 0; i
< nr_pages
; i
++) {
2549 struct page
*page
= pvec
.pages
[i
];
2552 * At this point, the page may be truncated or
2553 * invalidated (changing page->mapping to NULL), or
2554 * even swizzled back from swapper_space to tmpfs file
2555 * mapping. However, page->index will not change
2556 * because we have a reference on the page.
2558 if (page
->index
> end
)
2562 * Accumulated enough dirty pages? This doesn't apply
2563 * to WB_SYNC_ALL mode. For integrity sync we have to
2564 * keep going because someone may be concurrently
2565 * dirtying pages, and we might have synced a lot of
2566 * newly appeared dirty pages, but have not synced all
2567 * of the old dirty pages.
2569 if (mpd
->wbc
->sync_mode
== WB_SYNC_NONE
&& left
<= 0)
2572 /* If we can't merge this page, we are done. */
2573 if (mpd
->map
.m_len
> 0 && mpd
->next_page
!= page
->index
)
2578 * If the page is no longer dirty, or its mapping no
2579 * longer corresponds to inode we are writing (which
2580 * means it has been truncated or invalidated), or the
2581 * page is already under writeback and we are not doing
2582 * a data integrity writeback, skip the page
2584 if (!PageDirty(page
) ||
2585 (PageWriteback(page
) &&
2586 (mpd
->wbc
->sync_mode
== WB_SYNC_NONE
)) ||
2587 unlikely(page
->mapping
!= mapping
)) {
2592 wait_on_page_writeback(page
);
2593 BUG_ON(PageWriteback(page
));
2595 if (mpd
->map
.m_len
== 0)
2596 mpd
->first_page
= page
->index
;
2597 mpd
->next_page
= page
->index
+ 1;
2598 /* Add all dirty buffers to mpd */
2599 lblk
= ((ext4_lblk_t
)page
->index
) <<
2600 (PAGE_SHIFT
- blkbits
);
2601 head
= page_buffers(page
);
2602 err
= mpage_process_page_bufs(mpd
, head
, head
, lblk
);
2608 pagevec_release(&pvec
);
2613 pagevec_release(&pvec
);
2617 static int __writepage(struct page
*page
, struct writeback_control
*wbc
,
2620 struct address_space
*mapping
= data
;
2621 int ret
= ext4_writepage(page
, wbc
);
2622 mapping_set_error(mapping
, ret
);
2626 static int ext4_writepages(struct address_space
*mapping
,
2627 struct writeback_control
*wbc
)
2629 pgoff_t writeback_index
= 0;
2630 long nr_to_write
= wbc
->nr_to_write
;
2631 int range_whole
= 0;
2633 handle_t
*handle
= NULL
;
2634 struct mpage_da_data mpd
;
2635 struct inode
*inode
= mapping
->host
;
2636 int needed_blocks
, rsv_blocks
= 0, ret
= 0;
2637 struct ext4_sb_info
*sbi
= EXT4_SB(mapping
->host
->i_sb
);
2639 struct blk_plug plug
;
2640 bool give_up_on_write
= false;
2642 percpu_down_read(&sbi
->s_journal_flag_rwsem
);
2643 trace_ext4_writepages(inode
, wbc
);
2645 if (dax_mapping(mapping
)) {
2646 ret
= dax_writeback_mapping_range(mapping
, inode
->i_sb
->s_bdev
,
2648 goto out_writepages
;
2652 * No pages to write? This is mainly a kludge to avoid starting
2653 * a transaction for special inodes like journal inode on last iput()
2654 * because that could violate lock ordering on umount
2656 if (!mapping
->nrpages
|| !mapping_tagged(mapping
, PAGECACHE_TAG_DIRTY
))
2657 goto out_writepages
;
2659 if (ext4_should_journal_data(inode
)) {
2660 struct blk_plug plug
;
2662 blk_start_plug(&plug
);
2663 ret
= write_cache_pages(mapping
, wbc
, __writepage
, mapping
);
2664 blk_finish_plug(&plug
);
2665 goto out_writepages
;
2669 * If the filesystem has aborted, it is read-only, so return
2670 * right away instead of dumping stack traces later on that
2671 * will obscure the real source of the problem. We test
2672 * EXT4_MF_FS_ABORTED instead of sb->s_flag's MS_RDONLY because
2673 * the latter could be true if the filesystem is mounted
2674 * read-only, and in that case, ext4_writepages should
2675 * *never* be called, so if that ever happens, we would want
2678 if (unlikely(sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)) {
2680 goto out_writepages
;
2683 if (ext4_should_dioread_nolock(inode
)) {
2685 * We may need to convert up to one extent per block in
2686 * the page and we may dirty the inode.
2688 rsv_blocks
= 1 + (PAGE_SIZE
>> inode
->i_blkbits
);
2692 * If we have inline data and arrive here, it means that
2693 * we will soon create the block for the 1st page, so
2694 * we'd better clear the inline data here.
2696 if (ext4_has_inline_data(inode
)) {
2697 /* Just inode will be modified... */
2698 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 1);
2699 if (IS_ERR(handle
)) {
2700 ret
= PTR_ERR(handle
);
2701 goto out_writepages
;
2703 BUG_ON(ext4_test_inode_state(inode
,
2704 EXT4_STATE_MAY_INLINE_DATA
));
2705 ext4_destroy_inline_data(handle
, inode
);
2706 ext4_journal_stop(handle
);
2709 if (wbc
->range_start
== 0 && wbc
->range_end
== LLONG_MAX
)
2712 if (wbc
->range_cyclic
) {
2713 writeback_index
= mapping
->writeback_index
;
2714 if (writeback_index
)
2716 mpd
.first_page
= writeback_index
;
2719 mpd
.first_page
= wbc
->range_start
>> PAGE_SHIFT
;
2720 mpd
.last_page
= wbc
->range_end
>> PAGE_SHIFT
;
2725 ext4_io_submit_init(&mpd
.io_submit
, wbc
);
2727 if (wbc
->sync_mode
== WB_SYNC_ALL
|| wbc
->tagged_writepages
)
2728 tag_pages_for_writeback(mapping
, mpd
.first_page
, mpd
.last_page
);
2730 blk_start_plug(&plug
);
2731 while (!done
&& mpd
.first_page
<= mpd
.last_page
) {
2732 /* For each extent of pages we use new io_end */
2733 mpd
.io_submit
.io_end
= ext4_init_io_end(inode
, GFP_KERNEL
);
2734 if (!mpd
.io_submit
.io_end
) {
2740 * We have two constraints: We find one extent to map and we
2741 * must always write out whole page (makes a difference when
2742 * blocksize < pagesize) so that we don't block on IO when we
2743 * try to write out the rest of the page. Journalled mode is
2744 * not supported by delalloc.
2746 BUG_ON(ext4_should_journal_data(inode
));
2747 needed_blocks
= ext4_da_writepages_trans_blocks(inode
);
2749 /* start a new transaction */
2750 handle
= ext4_journal_start_with_reserve(inode
,
2751 EXT4_HT_WRITE_PAGE
, needed_blocks
, rsv_blocks
);
2752 if (IS_ERR(handle
)) {
2753 ret
= PTR_ERR(handle
);
2754 ext4_msg(inode
->i_sb
, KERN_CRIT
, "%s: jbd2_start: "
2755 "%ld pages, ino %lu; err %d", __func__
,
2756 wbc
->nr_to_write
, inode
->i_ino
, ret
);
2757 /* Release allocated io_end */
2758 ext4_put_io_end(mpd
.io_submit
.io_end
);
2762 trace_ext4_da_write_pages(inode
, mpd
.first_page
, mpd
.wbc
);
2763 ret
= mpage_prepare_extent_to_map(&mpd
);
2766 ret
= mpage_map_and_submit_extent(handle
, &mpd
,
2770 * We scanned the whole range (or exhausted
2771 * nr_to_write), submitted what was mapped and
2772 * didn't find anything needing mapping. We are
2779 * Caution: If the handle is synchronous,
2780 * ext4_journal_stop() can wait for transaction commit
2781 * to finish which may depend on writeback of pages to
2782 * complete or on page lock to be released. In that
2783 * case, we have to wait until after after we have
2784 * submitted all the IO, released page locks we hold,
2785 * and dropped io_end reference (for extent conversion
2786 * to be able to complete) before stopping the handle.
2788 if (!ext4_handle_valid(handle
) || handle
->h_sync
== 0) {
2789 ext4_journal_stop(handle
);
2792 /* Submit prepared bio */
2793 ext4_io_submit(&mpd
.io_submit
);
2794 /* Unlock pages we didn't use */
2795 mpage_release_unused_pages(&mpd
, give_up_on_write
);
2797 * Drop our io_end reference we got from init. We have
2798 * to be careful and use deferred io_end finishing if
2799 * we are still holding the transaction as we can
2800 * release the last reference to io_end which may end
2801 * up doing unwritten extent conversion.
2804 ext4_put_io_end_defer(mpd
.io_submit
.io_end
);
2805 ext4_journal_stop(handle
);
2807 ext4_put_io_end(mpd
.io_submit
.io_end
);
2809 if (ret
== -ENOSPC
&& sbi
->s_journal
) {
2811 * Commit the transaction which would
2812 * free blocks released in the transaction
2815 jbd2_journal_force_commit_nested(sbi
->s_journal
);
2819 /* Fatal error - ENOMEM, EIO... */
2823 blk_finish_plug(&plug
);
2824 if (!ret
&& !cycled
&& wbc
->nr_to_write
> 0) {
2826 mpd
.last_page
= writeback_index
- 1;
2832 if (wbc
->range_cyclic
|| (range_whole
&& wbc
->nr_to_write
> 0))
2834 * Set the writeback_index so that range_cyclic
2835 * mode will write it back later
2837 mapping
->writeback_index
= mpd
.first_page
;
2840 trace_ext4_writepages_result(inode
, wbc
, ret
,
2841 nr_to_write
- wbc
->nr_to_write
);
2842 percpu_up_read(&sbi
->s_journal_flag_rwsem
);
2846 static int ext4_nonda_switch(struct super_block
*sb
)
2848 s64 free_clusters
, dirty_clusters
;
2849 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2852 * switch to non delalloc mode if we are running low
2853 * on free block. The free block accounting via percpu
2854 * counters can get slightly wrong with percpu_counter_batch getting
2855 * accumulated on each CPU without updating global counters
2856 * Delalloc need an accurate free block accounting. So switch
2857 * to non delalloc when we are near to error range.
2860 percpu_counter_read_positive(&sbi
->s_freeclusters_counter
);
2862 percpu_counter_read_positive(&sbi
->s_dirtyclusters_counter
);
2864 * Start pushing delalloc when 1/2 of free blocks are dirty.
2866 if (dirty_clusters
&& (free_clusters
< 2 * dirty_clusters
))
2867 try_to_writeback_inodes_sb(sb
, WB_REASON_FS_FREE_SPACE
);
2869 if (2 * free_clusters
< 3 * dirty_clusters
||
2870 free_clusters
< (dirty_clusters
+ EXT4_FREECLUSTERS_WATERMARK
)) {
2872 * free block count is less than 150% of dirty blocks
2873 * or free blocks is less than watermark
2880 /* We always reserve for an inode update; the superblock could be there too */
2881 static int ext4_da_write_credits(struct inode
*inode
, loff_t pos
, unsigned len
)
2883 if (likely(ext4_has_feature_large_file(inode
->i_sb
)))
2886 if (pos
+ len
<= 0x7fffffffULL
)
2889 /* We might need to update the superblock to set LARGE_FILE */
2893 static int ext4_da_write_begin(struct file
*file
, struct address_space
*mapping
,
2894 loff_t pos
, unsigned len
, unsigned flags
,
2895 struct page
**pagep
, void **fsdata
)
2897 int ret
, retries
= 0;
2900 struct inode
*inode
= mapping
->host
;
2903 index
= pos
>> PAGE_SHIFT
;
2905 if (ext4_nonda_switch(inode
->i_sb
) ||
2906 S_ISLNK(inode
->i_mode
)) {
2907 *fsdata
= (void *)FALL_BACK_TO_NONDELALLOC
;
2908 return ext4_write_begin(file
, mapping
, pos
,
2909 len
, flags
, pagep
, fsdata
);
2911 *fsdata
= (void *)0;
2912 trace_ext4_da_write_begin(inode
, pos
, len
, flags
);
2914 if (ext4_test_inode_state(inode
, EXT4_STATE_MAY_INLINE_DATA
)) {
2915 ret
= ext4_da_write_inline_data_begin(mapping
, inode
,
2925 * grab_cache_page_write_begin() can take a long time if the
2926 * system is thrashing due to memory pressure, or if the page
2927 * is being written back. So grab it first before we start
2928 * the transaction handle. This also allows us to allocate
2929 * the page (if needed) without using GFP_NOFS.
2932 page
= grab_cache_page_write_begin(mapping
, index
, flags
);
2938 * With delayed allocation, we don't log the i_disksize update
2939 * if there is delayed block allocation. But we still need
2940 * to journalling the i_disksize update if writes to the end
2941 * of file which has an already mapped buffer.
2944 handle
= ext4_journal_start(inode
, EXT4_HT_WRITE_PAGE
,
2945 ext4_da_write_credits(inode
, pos
, len
));
2946 if (IS_ERR(handle
)) {
2948 return PTR_ERR(handle
);
2952 if (page
->mapping
!= mapping
) {
2953 /* The page got truncated from under us */
2956 ext4_journal_stop(handle
);
2959 /* In case writeback began while the page was unlocked */
2960 wait_for_stable_page(page
);
2962 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2963 ret
= ext4_block_write_begin(page
, pos
, len
,
2964 ext4_da_get_block_prep
);
2966 ret
= __block_write_begin(page
, pos
, len
, ext4_da_get_block_prep
);
2970 ext4_journal_stop(handle
);
2972 * block_write_begin may have instantiated a few blocks
2973 * outside i_size. Trim these off again. Don't need
2974 * i_size_read because we hold i_mutex.
2976 if (pos
+ len
> inode
->i_size
)
2977 ext4_truncate_failed_write(inode
);
2979 if (ret
== -ENOSPC
&&
2980 ext4_should_retry_alloc(inode
->i_sb
, &retries
))
2992 * Check if we should update i_disksize
2993 * when write to the end of file but not require block allocation
2995 static int ext4_da_should_update_i_disksize(struct page
*page
,
2996 unsigned long offset
)
2998 struct buffer_head
*bh
;
2999 struct inode
*inode
= page
->mapping
->host
;
3003 bh
= page_buffers(page
);
3004 idx
= offset
>> inode
->i_blkbits
;
3006 for (i
= 0; i
< idx
; i
++)
3007 bh
= bh
->b_this_page
;
3009 if (!buffer_mapped(bh
) || (buffer_delay(bh
)) || buffer_unwritten(bh
))
3014 static int ext4_da_write_end(struct file
*file
,
3015 struct address_space
*mapping
,
3016 loff_t pos
, unsigned len
, unsigned copied
,
3017 struct page
*page
, void *fsdata
)
3019 struct inode
*inode
= mapping
->host
;
3021 handle_t
*handle
= ext4_journal_current_handle();
3023 unsigned long start
, end
;
3024 int write_mode
= (int)(unsigned long)fsdata
;
3026 if (write_mode
== FALL_BACK_TO_NONDELALLOC
)
3027 return ext4_write_end(file
, mapping
, pos
,
3028 len
, copied
, page
, fsdata
);
3030 trace_ext4_da_write_end(inode
, pos
, len
, copied
);
3031 start
= pos
& (PAGE_SIZE
- 1);
3032 end
= start
+ copied
- 1;
3035 * generic_write_end() will run mark_inode_dirty() if i_size
3036 * changes. So let's piggyback the i_disksize mark_inode_dirty
3039 new_i_size
= pos
+ copied
;
3040 if (copied
&& new_i_size
> EXT4_I(inode
)->i_disksize
) {
3041 if (ext4_has_inline_data(inode
) ||
3042 ext4_da_should_update_i_disksize(page
, end
)) {
3043 ext4_update_i_disksize(inode
, new_i_size
);
3044 /* We need to mark inode dirty even if
3045 * new_i_size is less that inode->i_size
3046 * bu greater than i_disksize.(hint delalloc)
3048 ext4_mark_inode_dirty(handle
, inode
);
3052 if (write_mode
!= CONVERT_INLINE_DATA
&&
3053 ext4_test_inode_state(inode
, EXT4_STATE_MAY_INLINE_DATA
) &&
3054 ext4_has_inline_data(inode
))
3055 ret2
= ext4_da_write_inline_data_end(inode
, pos
, len
, copied
,
3058 ret2
= generic_write_end(file
, mapping
, pos
, len
, copied
,
3064 ret2
= ext4_journal_stop(handle
);
3068 return ret
? ret
: copied
;
3071 static void ext4_da_invalidatepage(struct page
*page
, unsigned int offset
,
3072 unsigned int length
)
3075 * Drop reserved blocks
3077 BUG_ON(!PageLocked(page
));
3078 if (!page_has_buffers(page
))
3081 ext4_da_page_release_reservation(page
, offset
, length
);
3084 ext4_invalidatepage(page
, offset
, length
);
3090 * Force all delayed allocation blocks to be allocated for a given inode.
3092 int ext4_alloc_da_blocks(struct inode
*inode
)
3094 trace_ext4_alloc_da_blocks(inode
);
3096 if (!EXT4_I(inode
)->i_reserved_data_blocks
)
3100 * We do something simple for now. The filemap_flush() will
3101 * also start triggering a write of the data blocks, which is
3102 * not strictly speaking necessary (and for users of
3103 * laptop_mode, not even desirable). However, to do otherwise
3104 * would require replicating code paths in:
3106 * ext4_writepages() ->
3107 * write_cache_pages() ---> (via passed in callback function)
3108 * __mpage_da_writepage() -->
3109 * mpage_add_bh_to_extent()
3110 * mpage_da_map_blocks()
3112 * The problem is that write_cache_pages(), located in
3113 * mm/page-writeback.c, marks pages clean in preparation for
3114 * doing I/O, which is not desirable if we're not planning on
3117 * We could call write_cache_pages(), and then redirty all of
3118 * the pages by calling redirty_page_for_writepage() but that
3119 * would be ugly in the extreme. So instead we would need to
3120 * replicate parts of the code in the above functions,
3121 * simplifying them because we wouldn't actually intend to
3122 * write out the pages, but rather only collect contiguous
3123 * logical block extents, call the multi-block allocator, and
3124 * then update the buffer heads with the block allocations.
3126 * For now, though, we'll cheat by calling filemap_flush(),
3127 * which will map the blocks, and start the I/O, but not
3128 * actually wait for the I/O to complete.
3130 return filemap_flush(inode
->i_mapping
);
3134 * bmap() is special. It gets used by applications such as lilo and by
3135 * the swapper to find the on-disk block of a specific piece of data.
3137 * Naturally, this is dangerous if the block concerned is still in the
3138 * journal. If somebody makes a swapfile on an ext4 data-journaling
3139 * filesystem and enables swap, then they may get a nasty shock when the
3140 * data getting swapped to that swapfile suddenly gets overwritten by
3141 * the original zero's written out previously to the journal and
3142 * awaiting writeback in the kernel's buffer cache.
3144 * So, if we see any bmap calls here on a modified, data-journaled file,
3145 * take extra steps to flush any blocks which might be in the cache.
3147 static sector_t
ext4_bmap(struct address_space
*mapping
, sector_t block
)
3149 struct inode
*inode
= mapping
->host
;
3154 * We can get here for an inline file via the FIBMAP ioctl
3156 if (ext4_has_inline_data(inode
))
3159 if (mapping_tagged(mapping
, PAGECACHE_TAG_DIRTY
) &&
3160 test_opt(inode
->i_sb
, DELALLOC
)) {
3162 * With delalloc we want to sync the file
3163 * so that we can make sure we allocate
3166 filemap_write_and_wait(mapping
);
3169 if (EXT4_JOURNAL(inode
) &&
3170 ext4_test_inode_state(inode
, EXT4_STATE_JDATA
)) {
3172 * This is a REALLY heavyweight approach, but the use of
3173 * bmap on dirty files is expected to be extremely rare:
3174 * only if we run lilo or swapon on a freshly made file
3175 * do we expect this to happen.
3177 * (bmap requires CAP_SYS_RAWIO so this does not
3178 * represent an unprivileged user DOS attack --- we'd be
3179 * in trouble if mortal users could trigger this path at
3182 * NB. EXT4_STATE_JDATA is not set on files other than
3183 * regular files. If somebody wants to bmap a directory
3184 * or symlink and gets confused because the buffer
3185 * hasn't yet been flushed to disk, they deserve
3186 * everything they get.
3189 ext4_clear_inode_state(inode
, EXT4_STATE_JDATA
);
3190 journal
= EXT4_JOURNAL(inode
);
3191 jbd2_journal_lock_updates(journal
);
3192 err
= jbd2_journal_flush(journal
);
3193 jbd2_journal_unlock_updates(journal
);
3199 return generic_block_bmap(mapping
, block
, ext4_get_block
);
3202 static int ext4_readpage(struct file
*file
, struct page
*page
)
3205 struct inode
*inode
= page
->mapping
->host
;
3207 trace_ext4_readpage(page
);
3209 if (ext4_has_inline_data(inode
))
3210 ret
= ext4_readpage_inline(inode
, page
);
3213 return ext4_mpage_readpages(page
->mapping
, NULL
, page
, 1);
3219 ext4_readpages(struct file
*file
, struct address_space
*mapping
,
3220 struct list_head
*pages
, unsigned nr_pages
)
3222 struct inode
*inode
= mapping
->host
;
3224 /* If the file has inline data, no need to do readpages. */
3225 if (ext4_has_inline_data(inode
))
3228 return ext4_mpage_readpages(mapping
, pages
, NULL
, nr_pages
);
3231 static void ext4_invalidatepage(struct page
*page
, unsigned int offset
,
3232 unsigned int length
)
3234 trace_ext4_invalidatepage(page
, offset
, length
);
3236 /* No journalling happens on data buffers when this function is used */
3237 WARN_ON(page_has_buffers(page
) && buffer_jbd(page_buffers(page
)));
3239 block_invalidatepage(page
, offset
, length
);
3242 static int __ext4_journalled_invalidatepage(struct page
*page
,
3243 unsigned int offset
,
3244 unsigned int length
)
3246 journal_t
*journal
= EXT4_JOURNAL(page
->mapping
->host
);
3248 trace_ext4_journalled_invalidatepage(page
, offset
, length
);
3251 * If it's a full truncate we just forget about the pending dirtying
3253 if (offset
== 0 && length
== PAGE_SIZE
)
3254 ClearPageChecked(page
);
3256 return jbd2_journal_invalidatepage(journal
, page
, offset
, length
);
3259 /* Wrapper for aops... */
3260 static void ext4_journalled_invalidatepage(struct page
*page
,
3261 unsigned int offset
,
3262 unsigned int length
)
3264 WARN_ON(__ext4_journalled_invalidatepage(page
, offset
, length
) < 0);
3267 static int ext4_releasepage(struct page
*page
, gfp_t wait
)
3269 journal_t
*journal
= EXT4_JOURNAL(page
->mapping
->host
);
3271 trace_ext4_releasepage(page
);
3273 /* Page has dirty journalled data -> cannot release */
3274 if (PageChecked(page
))
3277 return jbd2_journal_try_to_free_buffers(journal
, page
, wait
);
3279 return try_to_free_buffers(page
);
3282 #ifdef CONFIG_FS_DAX
3283 static int ext4_iomap_begin(struct inode
*inode
, loff_t offset
, loff_t length
,
3284 unsigned flags
, struct iomap
*iomap
)
3286 unsigned int blkbits
= inode
->i_blkbits
;
3287 unsigned long first_block
= offset
>> blkbits
;
3288 unsigned long last_block
= (offset
+ length
- 1) >> blkbits
;
3289 struct ext4_map_blocks map
;
3292 if (WARN_ON_ONCE(ext4_has_inline_data(inode
)))
3295 map
.m_lblk
= first_block
;
3296 map
.m_len
= last_block
- first_block
+ 1;
3298 if (!(flags
& IOMAP_WRITE
)) {
3299 ret
= ext4_map_blocks(NULL
, inode
, &map
, 0);
3305 /* Trim mapping request to maximum we can map at once for DIO */
3306 if (map
.m_len
> DIO_MAX_BLOCKS
)
3307 map
.m_len
= DIO_MAX_BLOCKS
;
3308 dio_credits
= ext4_chunk_trans_blocks(inode
, map
.m_len
);
3311 * Either we allocate blocks and then we don't get unwritten
3312 * extent so we have reserved enough credits, or the blocks
3313 * are already allocated and unwritten and in that case
3314 * extent conversion fits in the credits as well.
3316 handle
= ext4_journal_start(inode
, EXT4_HT_MAP_BLOCKS
,
3319 return PTR_ERR(handle
);
3321 ret
= ext4_map_blocks(handle
, inode
, &map
,
3322 EXT4_GET_BLOCKS_CREATE_ZERO
);
3324 ext4_journal_stop(handle
);
3325 if (ret
== -ENOSPC
&&
3326 ext4_should_retry_alloc(inode
->i_sb
, &retries
))
3332 * If we added blocks beyond i_size, we need to make sure they
3333 * will get truncated if we crash before updating i_size in
3334 * ext4_iomap_end(). For faults we don't need to do that (and
3335 * even cannot because for orphan list operations inode_lock is
3336 * required) - if we happen to instantiate block beyond i_size,
3337 * it is because we race with truncate which has already added
3338 * the inode to the orphan list.
3340 if (!(flags
& IOMAP_FAULT
) && first_block
+ map
.m_len
>
3341 (i_size_read(inode
) + (1 << blkbits
) - 1) >> blkbits
) {
3344 err
= ext4_orphan_add(handle
, inode
);
3346 ext4_journal_stop(handle
);
3350 ext4_journal_stop(handle
);
3354 iomap
->bdev
= inode
->i_sb
->s_bdev
;
3355 iomap
->offset
= first_block
<< blkbits
;
3358 iomap
->type
= IOMAP_HOLE
;
3359 iomap
->blkno
= IOMAP_NULL_BLOCK
;
3360 iomap
->length
= (u64
)map
.m_len
<< blkbits
;
3362 if (map
.m_flags
& EXT4_MAP_MAPPED
) {
3363 iomap
->type
= IOMAP_MAPPED
;
3364 } else if (map
.m_flags
& EXT4_MAP_UNWRITTEN
) {
3365 iomap
->type
= IOMAP_UNWRITTEN
;
3370 iomap
->blkno
= (sector_t
)map
.m_pblk
<< (blkbits
- 9);
3371 iomap
->length
= (u64
)map
.m_len
<< blkbits
;
3374 if (map
.m_flags
& EXT4_MAP_NEW
)
3375 iomap
->flags
|= IOMAP_F_NEW
;
3379 static int ext4_iomap_end(struct inode
*inode
, loff_t offset
, loff_t length
,
3380 ssize_t written
, unsigned flags
, struct iomap
*iomap
)
3384 int blkbits
= inode
->i_blkbits
;
3385 bool truncate
= false;
3387 if (!(flags
& IOMAP_WRITE
) || (flags
& IOMAP_FAULT
))
3390 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 2);
3391 if (IS_ERR(handle
)) {
3392 ret
= PTR_ERR(handle
);
3395 if (ext4_update_inode_size(inode
, offset
+ written
))
3396 ext4_mark_inode_dirty(handle
, inode
);
3398 * We may need to truncate allocated but not written blocks beyond EOF.
3400 if (iomap
->offset
+ iomap
->length
>
3401 ALIGN(inode
->i_size
, 1 << blkbits
)) {
3402 ext4_lblk_t written_blk
, end_blk
;
3404 written_blk
= (offset
+ written
) >> blkbits
;
3405 end_blk
= (offset
+ length
) >> blkbits
;
3406 if (written_blk
< end_blk
&& ext4_can_truncate(inode
))
3410 * Remove inode from orphan list if we were extending a inode and
3411 * everything went fine.
3413 if (!truncate
&& inode
->i_nlink
&&
3414 !list_empty(&EXT4_I(inode
)->i_orphan
))
3415 ext4_orphan_del(handle
, inode
);
3416 ext4_journal_stop(handle
);
3418 ext4_truncate_failed_write(inode
);
3421 * If truncate failed early the inode might still be on the
3422 * orphan list; we need to make sure the inode is removed from
3423 * the orphan list in that case.
3426 ext4_orphan_del(NULL
, inode
);
3431 struct iomap_ops ext4_iomap_ops
= {
3432 .iomap_begin
= ext4_iomap_begin
,
3433 .iomap_end
= ext4_iomap_end
,
3438 static int ext4_end_io_dio(struct kiocb
*iocb
, loff_t offset
,
3439 ssize_t size
, void *private)
3441 ext4_io_end_t
*io_end
= private;
3443 /* if not async direct IO just return */
3447 ext_debug("ext4_end_io_dio(): io_end 0x%p "
3448 "for inode %lu, iocb 0x%p, offset %llu, size %zd\n",
3449 io_end
, io_end
->inode
->i_ino
, iocb
, offset
, size
);
3452 * Error during AIO DIO. We cannot convert unwritten extents as the
3453 * data was not written. Just clear the unwritten flag and drop io_end.
3456 ext4_clear_io_unwritten_flag(io_end
);
3459 io_end
->offset
= offset
;
3460 io_end
->size
= size
;
3461 ext4_put_io_end(io_end
);
3467 * Handling of direct IO writes.
3469 * For ext4 extent files, ext4 will do direct-io write even to holes,
3470 * preallocated extents, and those write extend the file, no need to
3471 * fall back to buffered IO.
3473 * For holes, we fallocate those blocks, mark them as unwritten
3474 * If those blocks were preallocated, we mark sure they are split, but
3475 * still keep the range to write as unwritten.
3477 * The unwritten extents will be converted to written when DIO is completed.
3478 * For async direct IO, since the IO may still pending when return, we
3479 * set up an end_io call back function, which will do the conversion
3480 * when async direct IO completed.
3482 * If the O_DIRECT write will extend the file then add this inode to the
3483 * orphan list. So recovery will truncate it back to the original size
3484 * if the machine crashes during the write.
3487 static ssize_t
ext4_direct_IO_write(struct kiocb
*iocb
, struct iov_iter
*iter
)
3489 struct file
*file
= iocb
->ki_filp
;
3490 struct inode
*inode
= file
->f_mapping
->host
;
3491 struct ext4_inode_info
*ei
= EXT4_I(inode
);
3493 loff_t offset
= iocb
->ki_pos
;
3494 size_t count
= iov_iter_count(iter
);
3496 get_block_t
*get_block_func
= NULL
;
3498 loff_t final_size
= offset
+ count
;
3502 if (final_size
> inode
->i_size
) {
3503 /* Credits for sb + inode write */
3504 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 2);
3505 if (IS_ERR(handle
)) {
3506 ret
= PTR_ERR(handle
);
3509 ret
= ext4_orphan_add(handle
, inode
);
3511 ext4_journal_stop(handle
);
3515 ei
->i_disksize
= inode
->i_size
;
3516 ext4_journal_stop(handle
);
3519 BUG_ON(iocb
->private == NULL
);
3522 * Make all waiters for direct IO properly wait also for extent
3523 * conversion. This also disallows race between truncate() and
3524 * overwrite DIO as i_dio_count needs to be incremented under i_mutex.
3526 inode_dio_begin(inode
);
3528 /* If we do a overwrite dio, i_mutex locking can be released */
3529 overwrite
= *((int *)iocb
->private);
3532 inode_unlock(inode
);
3535 * For extent mapped files we could direct write to holes and fallocate.
3537 * Allocated blocks to fill the hole are marked as unwritten to prevent
3538 * parallel buffered read to expose the stale data before DIO complete
3541 * As to previously fallocated extents, ext4 get_block will just simply
3542 * mark the buffer mapped but still keep the extents unwritten.
3544 * For non AIO case, we will convert those unwritten extents to written
3545 * after return back from blockdev_direct_IO. That way we save us from
3546 * allocating io_end structure and also the overhead of offloading
3547 * the extent convertion to a workqueue.
3549 * For async DIO, the conversion needs to be deferred when the
3550 * IO is completed. The ext4 end_io callback function will be
3551 * called to take care of the conversion work. Here for async
3552 * case, we allocate an io_end structure to hook to the iocb.
3554 iocb
->private = NULL
;
3556 get_block_func
= ext4_dio_get_block_overwrite
;
3557 else if (!ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
) ||
3558 round_down(offset
, 1 << inode
->i_blkbits
) >= inode
->i_size
) {
3559 get_block_func
= ext4_dio_get_block
;
3560 dio_flags
= DIO_LOCKING
| DIO_SKIP_HOLES
;
3561 } else if (is_sync_kiocb(iocb
)) {
3562 get_block_func
= ext4_dio_get_block_unwritten_sync
;
3563 dio_flags
= DIO_LOCKING
;
3565 get_block_func
= ext4_dio_get_block_unwritten_async
;
3566 dio_flags
= DIO_LOCKING
;
3568 #ifdef CONFIG_EXT4_FS_ENCRYPTION
3569 BUG_ON(ext4_encrypted_inode(inode
) && S_ISREG(inode
->i_mode
));
3571 ret
= __blockdev_direct_IO(iocb
, inode
, inode
->i_sb
->s_bdev
, iter
,
3572 get_block_func
, ext4_end_io_dio
, NULL
,
3575 if (ret
> 0 && !overwrite
&& ext4_test_inode_state(inode
,
3576 EXT4_STATE_DIO_UNWRITTEN
)) {
3579 * for non AIO case, since the IO is already
3580 * completed, we could do the conversion right here
3582 err
= ext4_convert_unwritten_extents(NULL
, inode
,
3586 ext4_clear_inode_state(inode
, EXT4_STATE_DIO_UNWRITTEN
);
3589 inode_dio_end(inode
);
3590 /* take i_mutex locking again if we do a ovewrite dio */
3594 if (ret
< 0 && final_size
> inode
->i_size
)
3595 ext4_truncate_failed_write(inode
);
3597 /* Handle extending of i_size after direct IO write */
3601 /* Credits for sb + inode write */
3602 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 2);
3603 if (IS_ERR(handle
)) {
3604 /* This is really bad luck. We've written the data
3605 * but cannot extend i_size. Bail out and pretend
3606 * the write failed... */
3607 ret
= PTR_ERR(handle
);
3609 ext4_orphan_del(NULL
, inode
);
3614 ext4_orphan_del(handle
, inode
);
3616 loff_t end
= offset
+ ret
;
3617 if (end
> inode
->i_size
) {
3618 ei
->i_disksize
= end
;
3619 i_size_write(inode
, end
);
3621 * We're going to return a positive `ret'
3622 * here due to non-zero-length I/O, so there's
3623 * no way of reporting error returns from
3624 * ext4_mark_inode_dirty() to userspace. So
3627 ext4_mark_inode_dirty(handle
, inode
);
3630 err
= ext4_journal_stop(handle
);
3638 static ssize_t
ext4_direct_IO_read(struct kiocb
*iocb
, struct iov_iter
*iter
)
3640 struct address_space
*mapping
= iocb
->ki_filp
->f_mapping
;
3641 struct inode
*inode
= mapping
->host
;
3642 size_t count
= iov_iter_count(iter
);
3646 * Shared inode_lock is enough for us - it protects against concurrent
3647 * writes & truncates and since we take care of writing back page cache,
3648 * we are protected against page writeback as well.
3650 inode_lock_shared(inode
);
3651 ret
= filemap_write_and_wait_range(mapping
, iocb
->ki_pos
,
3652 iocb
->ki_pos
+ count
);
3655 ret
= __blockdev_direct_IO(iocb
, inode
, inode
->i_sb
->s_bdev
,
3656 iter
, ext4_dio_get_block
, NULL
, NULL
, 0);
3658 inode_unlock_shared(inode
);
3662 static ssize_t
ext4_direct_IO(struct kiocb
*iocb
, struct iov_iter
*iter
)
3664 struct file
*file
= iocb
->ki_filp
;
3665 struct inode
*inode
= file
->f_mapping
->host
;
3666 size_t count
= iov_iter_count(iter
);
3667 loff_t offset
= iocb
->ki_pos
;
3670 #ifdef CONFIG_EXT4_FS_ENCRYPTION
3671 if (ext4_encrypted_inode(inode
) && S_ISREG(inode
->i_mode
))
3676 * If we are doing data journalling we don't support O_DIRECT
3678 if (ext4_should_journal_data(inode
))
3681 /* Let buffer I/O handle the inline data case. */
3682 if (ext4_has_inline_data(inode
))
3685 /* DAX uses iomap path now */
3686 if (WARN_ON_ONCE(IS_DAX(inode
)))
3689 trace_ext4_direct_IO_enter(inode
, offset
, count
, iov_iter_rw(iter
));
3690 if (iov_iter_rw(iter
) == READ
)
3691 ret
= ext4_direct_IO_read(iocb
, iter
);
3693 ret
= ext4_direct_IO_write(iocb
, iter
);
3694 trace_ext4_direct_IO_exit(inode
, offset
, count
, iov_iter_rw(iter
), ret
);
3699 * Pages can be marked dirty completely asynchronously from ext4's journalling
3700 * activity. By filemap_sync_pte(), try_to_unmap_one(), etc. We cannot do
3701 * much here because ->set_page_dirty is called under VFS locks. The page is
3702 * not necessarily locked.
3704 * We cannot just dirty the page and leave attached buffers clean, because the
3705 * buffers' dirty state is "definitive". We cannot just set the buffers dirty
3706 * or jbddirty because all the journalling code will explode.
3708 * So what we do is to mark the page "pending dirty" and next time writepage
3709 * is called, propagate that into the buffers appropriately.
3711 static int ext4_journalled_set_page_dirty(struct page
*page
)
3713 SetPageChecked(page
);
3714 return __set_page_dirty_nobuffers(page
);
3717 static int ext4_set_page_dirty(struct page
*page
)
3719 WARN_ON_ONCE(!PageLocked(page
) && !PageDirty(page
));
3720 WARN_ON_ONCE(!page_has_buffers(page
));
3721 return __set_page_dirty_buffers(page
);
3724 static const struct address_space_operations ext4_aops
= {
3725 .readpage
= ext4_readpage
,
3726 .readpages
= ext4_readpages
,
3727 .writepage
= ext4_writepage
,
3728 .writepages
= ext4_writepages
,
3729 .write_begin
= ext4_write_begin
,
3730 .write_end
= ext4_write_end
,
3731 .set_page_dirty
= ext4_set_page_dirty
,
3733 .invalidatepage
= ext4_invalidatepage
,
3734 .releasepage
= ext4_releasepage
,
3735 .direct_IO
= ext4_direct_IO
,
3736 .migratepage
= buffer_migrate_page
,
3737 .is_partially_uptodate
= block_is_partially_uptodate
,
3738 .error_remove_page
= generic_error_remove_page
,
3741 static const struct address_space_operations ext4_journalled_aops
= {
3742 .readpage
= ext4_readpage
,
3743 .readpages
= ext4_readpages
,
3744 .writepage
= ext4_writepage
,
3745 .writepages
= ext4_writepages
,
3746 .write_begin
= ext4_write_begin
,
3747 .write_end
= ext4_journalled_write_end
,
3748 .set_page_dirty
= ext4_journalled_set_page_dirty
,
3750 .invalidatepage
= ext4_journalled_invalidatepage
,
3751 .releasepage
= ext4_releasepage
,
3752 .direct_IO
= ext4_direct_IO
,
3753 .is_partially_uptodate
= block_is_partially_uptodate
,
3754 .error_remove_page
= generic_error_remove_page
,
3757 static const struct address_space_operations ext4_da_aops
= {
3758 .readpage
= ext4_readpage
,
3759 .readpages
= ext4_readpages
,
3760 .writepage
= ext4_writepage
,
3761 .writepages
= ext4_writepages
,
3762 .write_begin
= ext4_da_write_begin
,
3763 .write_end
= ext4_da_write_end
,
3764 .set_page_dirty
= ext4_set_page_dirty
,
3766 .invalidatepage
= ext4_da_invalidatepage
,
3767 .releasepage
= ext4_releasepage
,
3768 .direct_IO
= ext4_direct_IO
,
3769 .migratepage
= buffer_migrate_page
,
3770 .is_partially_uptodate
= block_is_partially_uptodate
,
3771 .error_remove_page
= generic_error_remove_page
,
3774 void ext4_set_aops(struct inode
*inode
)
3776 switch (ext4_inode_journal_mode(inode
)) {
3777 case EXT4_INODE_ORDERED_DATA_MODE
:
3778 case EXT4_INODE_WRITEBACK_DATA_MODE
:
3780 case EXT4_INODE_JOURNAL_DATA_MODE
:
3781 inode
->i_mapping
->a_ops
= &ext4_journalled_aops
;
3786 if (test_opt(inode
->i_sb
, DELALLOC
))
3787 inode
->i_mapping
->a_ops
= &ext4_da_aops
;
3789 inode
->i_mapping
->a_ops
= &ext4_aops
;
3792 static int __ext4_block_zero_page_range(handle_t
*handle
,
3793 struct address_space
*mapping
, loff_t from
, loff_t length
)
3795 ext4_fsblk_t index
= from
>> PAGE_SHIFT
;
3796 unsigned offset
= from
& (PAGE_SIZE
-1);
3797 unsigned blocksize
, pos
;
3799 struct inode
*inode
= mapping
->host
;
3800 struct buffer_head
*bh
;
3804 page
= find_or_create_page(mapping
, from
>> PAGE_SHIFT
,
3805 mapping_gfp_constraint(mapping
, ~__GFP_FS
));
3809 blocksize
= inode
->i_sb
->s_blocksize
;
3811 iblock
= index
<< (PAGE_SHIFT
- inode
->i_sb
->s_blocksize_bits
);
3813 if (!page_has_buffers(page
))
3814 create_empty_buffers(page
, blocksize
, 0);
3816 /* Find the buffer that contains "offset" */
3817 bh
= page_buffers(page
);
3819 while (offset
>= pos
) {
3820 bh
= bh
->b_this_page
;
3824 if (buffer_freed(bh
)) {
3825 BUFFER_TRACE(bh
, "freed: skip");
3828 if (!buffer_mapped(bh
)) {
3829 BUFFER_TRACE(bh
, "unmapped");
3830 ext4_get_block(inode
, iblock
, bh
, 0);
3831 /* unmapped? It's a hole - nothing to do */
3832 if (!buffer_mapped(bh
)) {
3833 BUFFER_TRACE(bh
, "still unmapped");
3838 /* Ok, it's mapped. Make sure it's up-to-date */
3839 if (PageUptodate(page
))
3840 set_buffer_uptodate(bh
);
3842 if (!buffer_uptodate(bh
)) {
3844 ll_rw_block(REQ_OP_READ
, 0, 1, &bh
);
3846 /* Uhhuh. Read error. Complain and punt. */
3847 if (!buffer_uptodate(bh
))
3849 if (S_ISREG(inode
->i_mode
) &&
3850 ext4_encrypted_inode(inode
)) {
3851 /* We expect the key to be set. */
3852 BUG_ON(!fscrypt_has_encryption_key(inode
));
3853 BUG_ON(blocksize
!= PAGE_SIZE
);
3854 WARN_ON_ONCE(fscrypt_decrypt_page(page
->mapping
->host
,
3855 page
, PAGE_SIZE
, 0, page
->index
));
3858 if (ext4_should_journal_data(inode
)) {
3859 BUFFER_TRACE(bh
, "get write access");
3860 err
= ext4_journal_get_write_access(handle
, bh
);
3864 zero_user(page
, offset
, length
);
3865 BUFFER_TRACE(bh
, "zeroed end of block");
3867 if (ext4_should_journal_data(inode
)) {
3868 err
= ext4_handle_dirty_metadata(handle
, inode
, bh
);
3871 mark_buffer_dirty(bh
);
3872 if (ext4_should_order_data(inode
))
3873 err
= ext4_jbd2_inode_add_write(handle
, inode
);
3883 * ext4_block_zero_page_range() zeros out a mapping of length 'length'
3884 * starting from file offset 'from'. The range to be zero'd must
3885 * be contained with in one block. If the specified range exceeds
3886 * the end of the block it will be shortened to end of the block
3887 * that cooresponds to 'from'
3889 static int ext4_block_zero_page_range(handle_t
*handle
,
3890 struct address_space
*mapping
, loff_t from
, loff_t length
)
3892 struct inode
*inode
= mapping
->host
;
3893 unsigned offset
= from
& (PAGE_SIZE
-1);
3894 unsigned blocksize
= inode
->i_sb
->s_blocksize
;
3895 unsigned max
= blocksize
- (offset
& (blocksize
- 1));
3898 * correct length if it does not fall between
3899 * 'from' and the end of the block
3901 if (length
> max
|| length
< 0)
3904 if (IS_DAX(inode
)) {
3905 return iomap_zero_range(inode
, from
, length
, NULL
,
3908 return __ext4_block_zero_page_range(handle
, mapping
, from
, length
);
3912 * ext4_block_truncate_page() zeroes out a mapping from file offset `from'
3913 * up to the end of the block which corresponds to `from'.
3914 * This required during truncate. We need to physically zero the tail end
3915 * of that block so it doesn't yield old data if the file is later grown.
3917 static int ext4_block_truncate_page(handle_t
*handle
,
3918 struct address_space
*mapping
, loff_t from
)
3920 unsigned offset
= from
& (PAGE_SIZE
-1);
3923 struct inode
*inode
= mapping
->host
;
3925 blocksize
= inode
->i_sb
->s_blocksize
;
3926 length
= blocksize
- (offset
& (blocksize
- 1));
3928 return ext4_block_zero_page_range(handle
, mapping
, from
, length
);
3931 int ext4_zero_partial_blocks(handle_t
*handle
, struct inode
*inode
,
3932 loff_t lstart
, loff_t length
)
3934 struct super_block
*sb
= inode
->i_sb
;
3935 struct address_space
*mapping
= inode
->i_mapping
;
3936 unsigned partial_start
, partial_end
;
3937 ext4_fsblk_t start
, end
;
3938 loff_t byte_end
= (lstart
+ length
- 1);
3941 partial_start
= lstart
& (sb
->s_blocksize
- 1);
3942 partial_end
= byte_end
& (sb
->s_blocksize
- 1);
3944 start
= lstart
>> sb
->s_blocksize_bits
;
3945 end
= byte_end
>> sb
->s_blocksize_bits
;
3947 /* Handle partial zero within the single block */
3949 (partial_start
|| (partial_end
!= sb
->s_blocksize
- 1))) {
3950 err
= ext4_block_zero_page_range(handle
, mapping
,
3954 /* Handle partial zero out on the start of the range */
3955 if (partial_start
) {
3956 err
= ext4_block_zero_page_range(handle
, mapping
,
3957 lstart
, sb
->s_blocksize
);
3961 /* Handle partial zero out on the end of the range */
3962 if (partial_end
!= sb
->s_blocksize
- 1)
3963 err
= ext4_block_zero_page_range(handle
, mapping
,
3964 byte_end
- partial_end
,
3969 int ext4_can_truncate(struct inode
*inode
)
3971 if (S_ISREG(inode
->i_mode
))
3973 if (S_ISDIR(inode
->i_mode
))
3975 if (S_ISLNK(inode
->i_mode
))
3976 return !ext4_inode_is_fast_symlink(inode
);
3981 * We have to make sure i_disksize gets properly updated before we truncate
3982 * page cache due to hole punching or zero range. Otherwise i_disksize update
3983 * can get lost as it may have been postponed to submission of writeback but
3984 * that will never happen after we truncate page cache.
3986 int ext4_update_disksize_before_punch(struct inode
*inode
, loff_t offset
,
3990 loff_t size
= i_size_read(inode
);
3992 WARN_ON(!inode_is_locked(inode
));
3993 if (offset
> size
|| offset
+ len
< size
)
3996 if (EXT4_I(inode
)->i_disksize
>= size
)
3999 handle
= ext4_journal_start(inode
, EXT4_HT_MISC
, 1);
4001 return PTR_ERR(handle
);
4002 ext4_update_i_disksize(inode
, size
);
4003 ext4_mark_inode_dirty(handle
, inode
);
4004 ext4_journal_stop(handle
);
4010 * ext4_punch_hole: punches a hole in a file by releasing the blocks
4011 * associated with the given offset and length
4013 * @inode: File inode
4014 * @offset: The offset where the hole will begin
4015 * @len: The length of the hole
4017 * Returns: 0 on success or negative on failure
4020 int ext4_punch_hole(struct inode
*inode
, loff_t offset
, loff_t length
)
4022 struct super_block
*sb
= inode
->i_sb
;
4023 ext4_lblk_t first_block
, stop_block
;
4024 struct address_space
*mapping
= inode
->i_mapping
;
4025 loff_t first_block_offset
, last_block_offset
;
4027 unsigned int credits
;
4030 if (!S_ISREG(inode
->i_mode
))
4033 trace_ext4_punch_hole(inode
, offset
, length
, 0);
4036 * Write out all dirty pages to avoid race conditions
4037 * Then release them.
4039 if (mapping_tagged(mapping
, PAGECACHE_TAG_DIRTY
)) {
4040 ret
= filemap_write_and_wait_range(mapping
, offset
,
4041 offset
+ length
- 1);
4048 /* No need to punch hole beyond i_size */
4049 if (offset
>= inode
->i_size
)
4053 * If the hole extends beyond i_size, set the hole
4054 * to end after the page that contains i_size
4056 if (offset
+ length
> inode
->i_size
) {
4057 length
= inode
->i_size
+
4058 PAGE_SIZE
- (inode
->i_size
& (PAGE_SIZE
- 1)) -
4062 if (offset
& (sb
->s_blocksize
- 1) ||
4063 (offset
+ length
) & (sb
->s_blocksize
- 1)) {
4065 * Attach jinode to inode for jbd2 if we do any zeroing of
4068 ret
= ext4_inode_attach_jinode(inode
);
4074 /* Wait all existing dio workers, newcomers will block on i_mutex */
4075 ext4_inode_block_unlocked_dio(inode
);
4076 inode_dio_wait(inode
);
4079 * Prevent page faults from reinstantiating pages we have released from
4082 down_write(&EXT4_I(inode
)->i_mmap_sem
);
4083 first_block_offset
= round_up(offset
, sb
->s_blocksize
);
4084 last_block_offset
= round_down((offset
+ length
), sb
->s_blocksize
) - 1;
4086 /* Now release the pages and zero block aligned part of pages*/
4087 if (last_block_offset
> first_block_offset
) {
4088 ret
= ext4_update_disksize_before_punch(inode
, offset
, length
);
4091 truncate_pagecache_range(inode
, first_block_offset
,
4095 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))
4096 credits
= ext4_writepage_trans_blocks(inode
);
4098 credits
= ext4_blocks_for_truncate(inode
);
4099 handle
= ext4_journal_start(inode
, EXT4_HT_TRUNCATE
, credits
);
4100 if (IS_ERR(handle
)) {
4101 ret
= PTR_ERR(handle
);
4102 ext4_std_error(sb
, ret
);
4106 ret
= ext4_zero_partial_blocks(handle
, inode
, offset
,
4111 first_block
= (offset
+ sb
->s_blocksize
- 1) >>
4112 EXT4_BLOCK_SIZE_BITS(sb
);
4113 stop_block
= (offset
+ length
) >> EXT4_BLOCK_SIZE_BITS(sb
);
4115 /* If there are no blocks to remove, return now */
4116 if (first_block
>= stop_block
)
4119 down_write(&EXT4_I(inode
)->i_data_sem
);
4120 ext4_discard_preallocations(inode
);
4122 ret
= ext4_es_remove_extent(inode
, first_block
,
4123 stop_block
- first_block
);
4125 up_write(&EXT4_I(inode
)->i_data_sem
);
4129 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))
4130 ret
= ext4_ext_remove_space(inode
, first_block
,
4133 ret
= ext4_ind_remove_space(handle
, inode
, first_block
,
4136 up_write(&EXT4_I(inode
)->i_data_sem
);
4138 ext4_handle_sync(handle
);
4140 inode
->i_mtime
= inode
->i_ctime
= current_time(inode
);
4141 ext4_mark_inode_dirty(handle
, inode
);
4143 ext4_journal_stop(handle
);
4145 up_write(&EXT4_I(inode
)->i_mmap_sem
);
4146 ext4_inode_resume_unlocked_dio(inode
);
4148 inode_unlock(inode
);
4152 int ext4_inode_attach_jinode(struct inode
*inode
)
4154 struct ext4_inode_info
*ei
= EXT4_I(inode
);
4155 struct jbd2_inode
*jinode
;
4157 if (ei
->jinode
|| !EXT4_SB(inode
->i_sb
)->s_journal
)
4160 jinode
= jbd2_alloc_inode(GFP_KERNEL
);
4161 spin_lock(&inode
->i_lock
);
4164 spin_unlock(&inode
->i_lock
);
4167 ei
->jinode
= jinode
;
4168 jbd2_journal_init_jbd_inode(ei
->jinode
, inode
);
4171 spin_unlock(&inode
->i_lock
);
4172 if (unlikely(jinode
!= NULL
))
4173 jbd2_free_inode(jinode
);
4180 * We block out ext4_get_block() block instantiations across the entire
4181 * transaction, and VFS/VM ensures that ext4_truncate() cannot run
4182 * simultaneously on behalf of the same inode.
4184 * As we work through the truncate and commit bits of it to the journal there
4185 * is one core, guiding principle: the file's tree must always be consistent on
4186 * disk. We must be able to restart the truncate after a crash.
4188 * The file's tree may be transiently inconsistent in memory (although it
4189 * probably isn't), but whenever we close off and commit a journal transaction,
4190 * the contents of (the filesystem + the journal) must be consistent and
4191 * restartable. It's pretty simple, really: bottom up, right to left (although
4192 * left-to-right works OK too).
4194 * Note that at recovery time, journal replay occurs *before* the restart of
4195 * truncate against the orphan inode list.
4197 * The committed inode has the new, desired i_size (which is the same as
4198 * i_disksize in this case). After a crash, ext4_orphan_cleanup() will see
4199 * that this inode's truncate did not complete and it will again call
4200 * ext4_truncate() to have another go. So there will be instantiated blocks
4201 * to the right of the truncation point in a crashed ext4 filesystem. But
4202 * that's fine - as long as they are linked from the inode, the post-crash
4203 * ext4_truncate() run will find them and release them.
4205 int ext4_truncate(struct inode
*inode
)
4207 struct ext4_inode_info
*ei
= EXT4_I(inode
);
4208 unsigned int credits
;
4211 struct address_space
*mapping
= inode
->i_mapping
;
4214 * There is a possibility that we're either freeing the inode
4215 * or it's a completely new inode. In those cases we might not
4216 * have i_mutex locked because it's not necessary.
4218 if (!(inode
->i_state
& (I_NEW
|I_FREEING
)))
4219 WARN_ON(!inode_is_locked(inode
));
4220 trace_ext4_truncate_enter(inode
);
4222 if (!ext4_can_truncate(inode
))
4225 ext4_clear_inode_flag(inode
, EXT4_INODE_EOFBLOCKS
);
4227 if (inode
->i_size
== 0 && !test_opt(inode
->i_sb
, NO_AUTO_DA_ALLOC
))
4228 ext4_set_inode_state(inode
, EXT4_STATE_DA_ALLOC_CLOSE
);
4230 if (ext4_has_inline_data(inode
)) {
4233 ext4_inline_data_truncate(inode
, &has_inline
);
4238 /* If we zero-out tail of the page, we have to create jinode for jbd2 */
4239 if (inode
->i_size
& (inode
->i_sb
->s_blocksize
- 1)) {
4240 if (ext4_inode_attach_jinode(inode
) < 0)
4244 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))
4245 credits
= ext4_writepage_trans_blocks(inode
);
4247 credits
= ext4_blocks_for_truncate(inode
);
4249 handle
= ext4_journal_start(inode
, EXT4_HT_TRUNCATE
, credits
);
4251 return PTR_ERR(handle
);
4253 if (inode
->i_size
& (inode
->i_sb
->s_blocksize
- 1))
4254 ext4_block_truncate_page(handle
, mapping
, inode
->i_size
);
4257 * We add the inode to the orphan list, so that if this
4258 * truncate spans multiple transactions, and we crash, we will
4259 * resume the truncate when the filesystem recovers. It also
4260 * marks the inode dirty, to catch the new size.
4262 * Implication: the file must always be in a sane, consistent
4263 * truncatable state while each transaction commits.
4265 err
= ext4_orphan_add(handle
, inode
);
4269 down_write(&EXT4_I(inode
)->i_data_sem
);
4271 ext4_discard_preallocations(inode
);
4273 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))
4274 err
= ext4_ext_truncate(handle
, inode
);
4276 ext4_ind_truncate(handle
, inode
);
4278 up_write(&ei
->i_data_sem
);
4283 ext4_handle_sync(handle
);
4287 * If this was a simple ftruncate() and the file will remain alive,
4288 * then we need to clear up the orphan record which we created above.
4289 * However, if this was a real unlink then we were called by
4290 * ext4_evict_inode(), and we allow that function to clean up the
4291 * orphan info for us.
4294 ext4_orphan_del(handle
, inode
);
4296 inode
->i_mtime
= inode
->i_ctime
= current_time(inode
);
4297 ext4_mark_inode_dirty(handle
, inode
);
4298 ext4_journal_stop(handle
);
4300 trace_ext4_truncate_exit(inode
);
4305 * ext4_get_inode_loc returns with an extra refcount against the inode's
4306 * underlying buffer_head on success. If 'in_mem' is true, we have all
4307 * data in memory that is needed to recreate the on-disk version of this
4310 static int __ext4_get_inode_loc(struct inode
*inode
,
4311 struct ext4_iloc
*iloc
, int in_mem
)
4313 struct ext4_group_desc
*gdp
;
4314 struct buffer_head
*bh
;
4315 struct super_block
*sb
= inode
->i_sb
;
4317 int inodes_per_block
, inode_offset
;
4320 if (!ext4_valid_inum(sb
, inode
->i_ino
))
4321 return -EFSCORRUPTED
;
4323 iloc
->block_group
= (inode
->i_ino
- 1) / EXT4_INODES_PER_GROUP(sb
);
4324 gdp
= ext4_get_group_desc(sb
, iloc
->block_group
, NULL
);
4329 * Figure out the offset within the block group inode table
4331 inodes_per_block
= EXT4_SB(sb
)->s_inodes_per_block
;
4332 inode_offset
= ((inode
->i_ino
- 1) %
4333 EXT4_INODES_PER_GROUP(sb
));
4334 block
= ext4_inode_table(sb
, gdp
) + (inode_offset
/ inodes_per_block
);
4335 iloc
->offset
= (inode_offset
% inodes_per_block
) * EXT4_INODE_SIZE(sb
);
4337 bh
= sb_getblk(sb
, block
);
4340 if (!buffer_uptodate(bh
)) {
4344 * If the buffer has the write error flag, we have failed
4345 * to write out another inode in the same block. In this
4346 * case, we don't have to read the block because we may
4347 * read the old inode data successfully.
4349 if (buffer_write_io_error(bh
) && !buffer_uptodate(bh
))
4350 set_buffer_uptodate(bh
);
4352 if (buffer_uptodate(bh
)) {
4353 /* someone brought it uptodate while we waited */
4359 * If we have all information of the inode in memory and this
4360 * is the only valid inode in the block, we need not read the
4364 struct buffer_head
*bitmap_bh
;
4367 start
= inode_offset
& ~(inodes_per_block
- 1);
4369 /* Is the inode bitmap in cache? */
4370 bitmap_bh
= sb_getblk(sb
, ext4_inode_bitmap(sb
, gdp
));
4371 if (unlikely(!bitmap_bh
))
4375 * If the inode bitmap isn't in cache then the
4376 * optimisation may end up performing two reads instead
4377 * of one, so skip it.
4379 if (!buffer_uptodate(bitmap_bh
)) {
4383 for (i
= start
; i
< start
+ inodes_per_block
; i
++) {
4384 if (i
== inode_offset
)
4386 if (ext4_test_bit(i
, bitmap_bh
->b_data
))
4390 if (i
== start
+ inodes_per_block
) {
4391 /* all other inodes are free, so skip I/O */
4392 memset(bh
->b_data
, 0, bh
->b_size
);
4393 set_buffer_uptodate(bh
);
4401 * If we need to do any I/O, try to pre-readahead extra
4402 * blocks from the inode table.
4404 if (EXT4_SB(sb
)->s_inode_readahead_blks
) {
4405 ext4_fsblk_t b
, end
, table
;
4407 __u32 ra_blks
= EXT4_SB(sb
)->s_inode_readahead_blks
;
4409 table
= ext4_inode_table(sb
, gdp
);
4410 /* s_inode_readahead_blks is always a power of 2 */
4411 b
= block
& ~((ext4_fsblk_t
) ra_blks
- 1);
4415 num
= EXT4_INODES_PER_GROUP(sb
);
4416 if (ext4_has_group_desc_csum(sb
))
4417 num
-= ext4_itable_unused_count(sb
, gdp
);
4418 table
+= num
/ inodes_per_block
;
4422 sb_breadahead(sb
, b
++);
4426 * There are other valid inodes in the buffer, this inode
4427 * has in-inode xattrs, or we don't have this inode in memory.
4428 * Read the block from disk.
4430 trace_ext4_load_inode(inode
);
4432 bh
->b_end_io
= end_buffer_read_sync
;
4433 submit_bh(REQ_OP_READ
, REQ_META
| REQ_PRIO
, bh
);
4435 if (!buffer_uptodate(bh
)) {
4436 EXT4_ERROR_INODE_BLOCK(inode
, block
,
4437 "unable to read itable block");
4447 int ext4_get_inode_loc(struct inode
*inode
, struct ext4_iloc
*iloc
)
4449 /* We have all inode data except xattrs in memory here. */
4450 return __ext4_get_inode_loc(inode
, iloc
,
4451 !ext4_test_inode_state(inode
, EXT4_STATE_XATTR
));
4454 void ext4_set_inode_flags(struct inode
*inode
)
4456 unsigned int flags
= EXT4_I(inode
)->i_flags
;
4457 unsigned int new_fl
= 0;
4459 if (flags
& EXT4_SYNC_FL
)
4461 if (flags
& EXT4_APPEND_FL
)
4463 if (flags
& EXT4_IMMUTABLE_FL
)
4464 new_fl
|= S_IMMUTABLE
;
4465 if (flags
& EXT4_NOATIME_FL
)
4466 new_fl
|= S_NOATIME
;
4467 if (flags
& EXT4_DIRSYNC_FL
)
4468 new_fl
|= S_DIRSYNC
;
4469 if (test_opt(inode
->i_sb
, DAX
) && S_ISREG(inode
->i_mode
) &&
4470 !ext4_should_journal_data(inode
) && !ext4_has_inline_data(inode
) &&
4471 !ext4_encrypted_inode(inode
))
4473 inode_set_flags(inode
, new_fl
,
4474 S_SYNC
|S_APPEND
|S_IMMUTABLE
|S_NOATIME
|S_DIRSYNC
|S_DAX
);
4477 /* Propagate flags from i_flags to EXT4_I(inode)->i_flags */
4478 void ext4_get_inode_flags(struct ext4_inode_info
*ei
)
4480 unsigned int vfs_fl
;
4481 unsigned long old_fl
, new_fl
;
4484 vfs_fl
= ei
->vfs_inode
.i_flags
;
4485 old_fl
= ei
->i_flags
;
4486 new_fl
= old_fl
& ~(EXT4_SYNC_FL
|EXT4_APPEND_FL
|
4487 EXT4_IMMUTABLE_FL
|EXT4_NOATIME_FL
|
4489 if (vfs_fl
& S_SYNC
)
4490 new_fl
|= EXT4_SYNC_FL
;
4491 if (vfs_fl
& S_APPEND
)
4492 new_fl
|= EXT4_APPEND_FL
;
4493 if (vfs_fl
& S_IMMUTABLE
)
4494 new_fl
|= EXT4_IMMUTABLE_FL
;
4495 if (vfs_fl
& S_NOATIME
)
4496 new_fl
|= EXT4_NOATIME_FL
;
4497 if (vfs_fl
& S_DIRSYNC
)
4498 new_fl
|= EXT4_DIRSYNC_FL
;
4499 } while (cmpxchg(&ei
->i_flags
, old_fl
, new_fl
) != old_fl
);
4502 static blkcnt_t
ext4_inode_blocks(struct ext4_inode
*raw_inode
,
4503 struct ext4_inode_info
*ei
)
4506 struct inode
*inode
= &(ei
->vfs_inode
);
4507 struct super_block
*sb
= inode
->i_sb
;
4509 if (ext4_has_feature_huge_file(sb
)) {
4510 /* we are using combined 48 bit field */
4511 i_blocks
= ((u64
)le16_to_cpu(raw_inode
->i_blocks_high
)) << 32 |
4512 le32_to_cpu(raw_inode
->i_blocks_lo
);
4513 if (ext4_test_inode_flag(inode
, EXT4_INODE_HUGE_FILE
)) {
4514 /* i_blocks represent file system block size */
4515 return i_blocks
<< (inode
->i_blkbits
- 9);
4520 return le32_to_cpu(raw_inode
->i_blocks_lo
);
4524 static inline void ext4_iget_extra_inode(struct inode
*inode
,
4525 struct ext4_inode
*raw_inode
,
4526 struct ext4_inode_info
*ei
)
4528 __le32
*magic
= (void *)raw_inode
+
4529 EXT4_GOOD_OLD_INODE_SIZE
+ ei
->i_extra_isize
;
4530 if (EXT4_GOOD_OLD_INODE_SIZE
+ ei
->i_extra_isize
+ sizeof(__le32
) <=
4531 EXT4_INODE_SIZE(inode
->i_sb
) &&
4532 *magic
== cpu_to_le32(EXT4_XATTR_MAGIC
)) {
4533 ext4_set_inode_state(inode
, EXT4_STATE_XATTR
);
4534 ext4_find_inline_data_nolock(inode
);
4536 EXT4_I(inode
)->i_inline_off
= 0;
4539 int ext4_get_projid(struct inode
*inode
, kprojid_t
*projid
)
4541 if (!ext4_has_feature_project(inode
->i_sb
))
4543 *projid
= EXT4_I(inode
)->i_projid
;
4547 struct inode
*ext4_iget(struct super_block
*sb
, unsigned long ino
)
4549 struct ext4_iloc iloc
;
4550 struct ext4_inode
*raw_inode
;
4551 struct ext4_inode_info
*ei
;
4552 struct inode
*inode
;
4553 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
4561 inode
= iget_locked(sb
, ino
);
4563 return ERR_PTR(-ENOMEM
);
4564 if (!(inode
->i_state
& I_NEW
))
4570 ret
= __ext4_get_inode_loc(inode
, &iloc
, 0);
4573 raw_inode
= ext4_raw_inode(&iloc
);
4575 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
) {
4576 ei
->i_extra_isize
= le16_to_cpu(raw_inode
->i_extra_isize
);
4577 if (EXT4_GOOD_OLD_INODE_SIZE
+ ei
->i_extra_isize
>
4578 EXT4_INODE_SIZE(inode
->i_sb
) ||
4579 (ei
->i_extra_isize
& 3)) {
4580 EXT4_ERROR_INODE(inode
,
4581 "bad extra_isize %u (inode size %u)",
4583 EXT4_INODE_SIZE(inode
->i_sb
));
4584 ret
= -EFSCORRUPTED
;
4588 ei
->i_extra_isize
= 0;
4590 /* Precompute checksum seed for inode metadata */
4591 if (ext4_has_metadata_csum(sb
)) {
4592 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
4594 __le32 inum
= cpu_to_le32(inode
->i_ino
);
4595 __le32 gen
= raw_inode
->i_generation
;
4596 csum
= ext4_chksum(sbi
, sbi
->s_csum_seed
, (__u8
*)&inum
,
4598 ei
->i_csum_seed
= ext4_chksum(sbi
, csum
, (__u8
*)&gen
,
4602 if (!ext4_inode_csum_verify(inode
, raw_inode
, ei
)) {
4603 EXT4_ERROR_INODE(inode
, "checksum invalid");
4608 inode
->i_mode
= le16_to_cpu(raw_inode
->i_mode
);
4609 i_uid
= (uid_t
)le16_to_cpu(raw_inode
->i_uid_low
);
4610 i_gid
= (gid_t
)le16_to_cpu(raw_inode
->i_gid_low
);
4611 if (ext4_has_feature_project(sb
) &&
4612 EXT4_INODE_SIZE(sb
) > EXT4_GOOD_OLD_INODE_SIZE
&&
4613 EXT4_FITS_IN_INODE(raw_inode
, ei
, i_projid
))
4614 i_projid
= (projid_t
)le32_to_cpu(raw_inode
->i_projid
);
4616 i_projid
= EXT4_DEF_PROJID
;
4618 if (!(test_opt(inode
->i_sb
, NO_UID32
))) {
4619 i_uid
|= le16_to_cpu(raw_inode
->i_uid_high
) << 16;
4620 i_gid
|= le16_to_cpu(raw_inode
->i_gid_high
) << 16;
4622 i_uid_write(inode
, i_uid
);
4623 i_gid_write(inode
, i_gid
);
4624 ei
->i_projid
= make_kprojid(&init_user_ns
, i_projid
);
4625 set_nlink(inode
, le16_to_cpu(raw_inode
->i_links_count
));
4627 ext4_clear_state_flags(ei
); /* Only relevant on 32-bit archs */
4628 ei
->i_inline_off
= 0;
4629 ei
->i_dir_start_lookup
= 0;
4630 ei
->i_dtime
= le32_to_cpu(raw_inode
->i_dtime
);
4631 /* We now have enough fields to check if the inode was active or not.
4632 * This is needed because nfsd might try to access dead inodes
4633 * the test is that same one that e2fsck uses
4634 * NeilBrown 1999oct15
4636 if (inode
->i_nlink
== 0) {
4637 if ((inode
->i_mode
== 0 ||
4638 !(EXT4_SB(inode
->i_sb
)->s_mount_state
& EXT4_ORPHAN_FS
)) &&
4639 ino
!= EXT4_BOOT_LOADER_INO
) {
4640 /* this inode is deleted */
4644 /* The only unlinked inodes we let through here have
4645 * valid i_mode and are being read by the orphan
4646 * recovery code: that's fine, we're about to complete
4647 * the process of deleting those.
4648 * OR it is the EXT4_BOOT_LOADER_INO which is
4649 * not initialized on a new filesystem. */
4651 ei
->i_flags
= le32_to_cpu(raw_inode
->i_flags
);
4652 inode
->i_blocks
= ext4_inode_blocks(raw_inode
, ei
);
4653 ei
->i_file_acl
= le32_to_cpu(raw_inode
->i_file_acl_lo
);
4654 if (ext4_has_feature_64bit(sb
))
4656 ((__u64
)le16_to_cpu(raw_inode
->i_file_acl_high
)) << 32;
4657 inode
->i_size
= ext4_isize(raw_inode
);
4658 if ((size
= i_size_read(inode
)) < 0) {
4659 EXT4_ERROR_INODE(inode
, "bad i_size value: %lld", size
);
4660 ret
= -EFSCORRUPTED
;
4663 ei
->i_disksize
= inode
->i_size
;
4665 ei
->i_reserved_quota
= 0;
4667 inode
->i_generation
= le32_to_cpu(raw_inode
->i_generation
);
4668 ei
->i_block_group
= iloc
.block_group
;
4669 ei
->i_last_alloc_group
= ~0;
4671 * NOTE! The in-memory inode i_data array is in little-endian order
4672 * even on big-endian machines: we do NOT byteswap the block numbers!
4674 for (block
= 0; block
< EXT4_N_BLOCKS
; block
++)
4675 ei
->i_data
[block
] = raw_inode
->i_block
[block
];
4676 INIT_LIST_HEAD(&ei
->i_orphan
);
4679 * Set transaction id's of transactions that have to be committed
4680 * to finish f[data]sync. We set them to currently running transaction
4681 * as we cannot be sure that the inode or some of its metadata isn't
4682 * part of the transaction - the inode could have been reclaimed and
4683 * now it is reread from disk.
4686 transaction_t
*transaction
;
4689 read_lock(&journal
->j_state_lock
);
4690 if (journal
->j_running_transaction
)
4691 transaction
= journal
->j_running_transaction
;
4693 transaction
= journal
->j_committing_transaction
;
4695 tid
= transaction
->t_tid
;
4697 tid
= journal
->j_commit_sequence
;
4698 read_unlock(&journal
->j_state_lock
);
4699 ei
->i_sync_tid
= tid
;
4700 ei
->i_datasync_tid
= tid
;
4703 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
) {
4704 if (ei
->i_extra_isize
== 0) {
4705 /* The extra space is currently unused. Use it. */
4706 BUILD_BUG_ON(sizeof(struct ext4_inode
) & 3);
4707 ei
->i_extra_isize
= sizeof(struct ext4_inode
) -
4708 EXT4_GOOD_OLD_INODE_SIZE
;
4710 ext4_iget_extra_inode(inode
, raw_inode
, ei
);
4714 EXT4_INODE_GET_XTIME(i_ctime
, inode
, raw_inode
);
4715 EXT4_INODE_GET_XTIME(i_mtime
, inode
, raw_inode
);
4716 EXT4_INODE_GET_XTIME(i_atime
, inode
, raw_inode
);
4717 EXT4_EINODE_GET_XTIME(i_crtime
, ei
, raw_inode
);
4719 if (likely(!test_opt2(inode
->i_sb
, HURD_COMPAT
))) {
4720 inode
->i_version
= le32_to_cpu(raw_inode
->i_disk_version
);
4721 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
) {
4722 if (EXT4_FITS_IN_INODE(raw_inode
, ei
, i_version_hi
))
4724 (__u64
)(le32_to_cpu(raw_inode
->i_version_hi
)) << 32;
4729 if (ei
->i_file_acl
&&
4730 !ext4_data_block_valid(EXT4_SB(sb
), ei
->i_file_acl
, 1)) {
4731 EXT4_ERROR_INODE(inode
, "bad extended attribute block %llu",
4733 ret
= -EFSCORRUPTED
;
4735 } else if (!ext4_has_inline_data(inode
)) {
4736 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)) {
4737 if ((S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
4738 (S_ISLNK(inode
->i_mode
) &&
4739 !ext4_inode_is_fast_symlink(inode
))))
4740 /* Validate extent which is part of inode */
4741 ret
= ext4_ext_check_inode(inode
);
4742 } else if (S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
4743 (S_ISLNK(inode
->i_mode
) &&
4744 !ext4_inode_is_fast_symlink(inode
))) {
4745 /* Validate block references which are part of inode */
4746 ret
= ext4_ind_check_inode(inode
);
4752 if (S_ISREG(inode
->i_mode
)) {
4753 inode
->i_op
= &ext4_file_inode_operations
;
4754 inode
->i_fop
= &ext4_file_operations
;
4755 ext4_set_aops(inode
);
4756 } else if (S_ISDIR(inode
->i_mode
)) {
4757 inode
->i_op
= &ext4_dir_inode_operations
;
4758 inode
->i_fop
= &ext4_dir_operations
;
4759 } else if (S_ISLNK(inode
->i_mode
)) {
4760 if (ext4_encrypted_inode(inode
)) {
4761 inode
->i_op
= &ext4_encrypted_symlink_inode_operations
;
4762 ext4_set_aops(inode
);
4763 } else if (ext4_inode_is_fast_symlink(inode
)) {
4764 inode
->i_link
= (char *)ei
->i_data
;
4765 inode
->i_op
= &ext4_fast_symlink_inode_operations
;
4766 nd_terminate_link(ei
->i_data
, inode
->i_size
,
4767 sizeof(ei
->i_data
) - 1);
4769 inode
->i_op
= &ext4_symlink_inode_operations
;
4770 ext4_set_aops(inode
);
4772 inode_nohighmem(inode
);
4773 } else if (S_ISCHR(inode
->i_mode
) || S_ISBLK(inode
->i_mode
) ||
4774 S_ISFIFO(inode
->i_mode
) || S_ISSOCK(inode
->i_mode
)) {
4775 inode
->i_op
= &ext4_special_inode_operations
;
4776 if (raw_inode
->i_block
[0])
4777 init_special_inode(inode
, inode
->i_mode
,
4778 old_decode_dev(le32_to_cpu(raw_inode
->i_block
[0])));
4780 init_special_inode(inode
, inode
->i_mode
,
4781 new_decode_dev(le32_to_cpu(raw_inode
->i_block
[1])));
4782 } else if (ino
== EXT4_BOOT_LOADER_INO
) {
4783 make_bad_inode(inode
);
4785 ret
= -EFSCORRUPTED
;
4786 EXT4_ERROR_INODE(inode
, "bogus i_mode (%o)", inode
->i_mode
);
4790 ext4_set_inode_flags(inode
);
4791 unlock_new_inode(inode
);
4797 return ERR_PTR(ret
);
4800 struct inode
*ext4_iget_normal(struct super_block
*sb
, unsigned long ino
)
4802 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
4803 return ERR_PTR(-EFSCORRUPTED
);
4804 return ext4_iget(sb
, ino
);
4807 static int ext4_inode_blocks_set(handle_t
*handle
,
4808 struct ext4_inode
*raw_inode
,
4809 struct ext4_inode_info
*ei
)
4811 struct inode
*inode
= &(ei
->vfs_inode
);
4812 u64 i_blocks
= inode
->i_blocks
;
4813 struct super_block
*sb
= inode
->i_sb
;
4815 if (i_blocks
<= ~0U) {
4817 * i_blocks can be represented in a 32 bit variable
4818 * as multiple of 512 bytes
4820 raw_inode
->i_blocks_lo
= cpu_to_le32(i_blocks
);
4821 raw_inode
->i_blocks_high
= 0;
4822 ext4_clear_inode_flag(inode
, EXT4_INODE_HUGE_FILE
);
4825 if (!ext4_has_feature_huge_file(sb
))
4828 if (i_blocks
<= 0xffffffffffffULL
) {
4830 * i_blocks can be represented in a 48 bit variable
4831 * as multiple of 512 bytes
4833 raw_inode
->i_blocks_lo
= cpu_to_le32(i_blocks
);
4834 raw_inode
->i_blocks_high
= cpu_to_le16(i_blocks
>> 32);
4835 ext4_clear_inode_flag(inode
, EXT4_INODE_HUGE_FILE
);
4837 ext4_set_inode_flag(inode
, EXT4_INODE_HUGE_FILE
);
4838 /* i_block is stored in file system block size */
4839 i_blocks
= i_blocks
>> (inode
->i_blkbits
- 9);
4840 raw_inode
->i_blocks_lo
= cpu_to_le32(i_blocks
);
4841 raw_inode
->i_blocks_high
= cpu_to_le16(i_blocks
>> 32);
4846 struct other_inode
{
4847 unsigned long orig_ino
;
4848 struct ext4_inode
*raw_inode
;
4851 static int other_inode_match(struct inode
* inode
, unsigned long ino
,
4854 struct other_inode
*oi
= (struct other_inode
*) data
;
4856 if ((inode
->i_ino
!= ino
) ||
4857 (inode
->i_state
& (I_FREEING
| I_WILL_FREE
| I_NEW
|
4858 I_DIRTY_SYNC
| I_DIRTY_DATASYNC
)) ||
4859 ((inode
->i_state
& I_DIRTY_TIME
) == 0))
4861 spin_lock(&inode
->i_lock
);
4862 if (((inode
->i_state
& (I_FREEING
| I_WILL_FREE
| I_NEW
|
4863 I_DIRTY_SYNC
| I_DIRTY_DATASYNC
)) == 0) &&
4864 (inode
->i_state
& I_DIRTY_TIME
)) {
4865 struct ext4_inode_info
*ei
= EXT4_I(inode
);
4867 inode
->i_state
&= ~(I_DIRTY_TIME
| I_DIRTY_TIME_EXPIRED
);
4868 spin_unlock(&inode
->i_lock
);
4870 spin_lock(&ei
->i_raw_lock
);
4871 EXT4_INODE_SET_XTIME(i_ctime
, inode
, oi
->raw_inode
);
4872 EXT4_INODE_SET_XTIME(i_mtime
, inode
, oi
->raw_inode
);
4873 EXT4_INODE_SET_XTIME(i_atime
, inode
, oi
->raw_inode
);
4874 ext4_inode_csum_set(inode
, oi
->raw_inode
, ei
);
4875 spin_unlock(&ei
->i_raw_lock
);
4876 trace_ext4_other_inode_update_time(inode
, oi
->orig_ino
);
4879 spin_unlock(&inode
->i_lock
);
4884 * Opportunistically update the other time fields for other inodes in
4885 * the same inode table block.
4887 static void ext4_update_other_inodes_time(struct super_block
*sb
,
4888 unsigned long orig_ino
, char *buf
)
4890 struct other_inode oi
;
4892 int i
, inodes_per_block
= EXT4_SB(sb
)->s_inodes_per_block
;
4893 int inode_size
= EXT4_INODE_SIZE(sb
);
4895 oi
.orig_ino
= orig_ino
;
4897 * Calculate the first inode in the inode table block. Inode
4898 * numbers are one-based. That is, the first inode in a block
4899 * (assuming 4k blocks and 256 byte inodes) is (n*16 + 1).
4901 ino
= ((orig_ino
- 1) & ~(inodes_per_block
- 1)) + 1;
4902 for (i
= 0; i
< inodes_per_block
; i
++, ino
++, buf
+= inode_size
) {
4903 if (ino
== orig_ino
)
4905 oi
.raw_inode
= (struct ext4_inode
*) buf
;
4906 (void) find_inode_nowait(sb
, ino
, other_inode_match
, &oi
);
4911 * Post the struct inode info into an on-disk inode location in the
4912 * buffer-cache. This gobbles the caller's reference to the
4913 * buffer_head in the inode location struct.
4915 * The caller must have write access to iloc->bh.
4917 static int ext4_do_update_inode(handle_t
*handle
,
4918 struct inode
*inode
,
4919 struct ext4_iloc
*iloc
)
4921 struct ext4_inode
*raw_inode
= ext4_raw_inode(iloc
);
4922 struct ext4_inode_info
*ei
= EXT4_I(inode
);
4923 struct buffer_head
*bh
= iloc
->bh
;
4924 struct super_block
*sb
= inode
->i_sb
;
4925 int err
= 0, rc
, block
;
4926 int need_datasync
= 0, set_large_file
= 0;
4931 spin_lock(&ei
->i_raw_lock
);
4933 /* For fields not tracked in the in-memory inode,
4934 * initialise them to zero for new inodes. */
4935 if (ext4_test_inode_state(inode
, EXT4_STATE_NEW
))
4936 memset(raw_inode
, 0, EXT4_SB(inode
->i_sb
)->s_inode_size
);
4938 ext4_get_inode_flags(ei
);
4939 raw_inode
->i_mode
= cpu_to_le16(inode
->i_mode
);
4940 i_uid
= i_uid_read(inode
);
4941 i_gid
= i_gid_read(inode
);
4942 i_projid
= from_kprojid(&init_user_ns
, ei
->i_projid
);
4943 if (!(test_opt(inode
->i_sb
, NO_UID32
))) {
4944 raw_inode
->i_uid_low
= cpu_to_le16(low_16_bits(i_uid
));
4945 raw_inode
->i_gid_low
= cpu_to_le16(low_16_bits(i_gid
));
4947 * Fix up interoperability with old kernels. Otherwise, old inodes get
4948 * re-used with the upper 16 bits of the uid/gid intact
4950 if (ei
->i_dtime
&& list_empty(&ei
->i_orphan
)) {
4951 raw_inode
->i_uid_high
= 0;
4952 raw_inode
->i_gid_high
= 0;
4954 raw_inode
->i_uid_high
=
4955 cpu_to_le16(high_16_bits(i_uid
));
4956 raw_inode
->i_gid_high
=
4957 cpu_to_le16(high_16_bits(i_gid
));
4960 raw_inode
->i_uid_low
= cpu_to_le16(fs_high2lowuid(i_uid
));
4961 raw_inode
->i_gid_low
= cpu_to_le16(fs_high2lowgid(i_gid
));
4962 raw_inode
->i_uid_high
= 0;
4963 raw_inode
->i_gid_high
= 0;
4965 raw_inode
->i_links_count
= cpu_to_le16(inode
->i_nlink
);
4967 EXT4_INODE_SET_XTIME(i_ctime
, inode
, raw_inode
);
4968 EXT4_INODE_SET_XTIME(i_mtime
, inode
, raw_inode
);
4969 EXT4_INODE_SET_XTIME(i_atime
, inode
, raw_inode
);
4970 EXT4_EINODE_SET_XTIME(i_crtime
, ei
, raw_inode
);
4972 err
= ext4_inode_blocks_set(handle
, raw_inode
, ei
);
4974 spin_unlock(&ei
->i_raw_lock
);
4977 raw_inode
->i_dtime
= cpu_to_le32(ei
->i_dtime
);
4978 raw_inode
->i_flags
= cpu_to_le32(ei
->i_flags
& 0xFFFFFFFF);
4979 if (likely(!test_opt2(inode
->i_sb
, HURD_COMPAT
)))
4980 raw_inode
->i_file_acl_high
=
4981 cpu_to_le16(ei
->i_file_acl
>> 32);
4982 raw_inode
->i_file_acl_lo
= cpu_to_le32(ei
->i_file_acl
);
4983 if (ei
->i_disksize
!= ext4_isize(raw_inode
)) {
4984 ext4_isize_set(raw_inode
, ei
->i_disksize
);
4987 if (ei
->i_disksize
> 0x7fffffffULL
) {
4988 if (!ext4_has_feature_large_file(sb
) ||
4989 EXT4_SB(sb
)->s_es
->s_rev_level
==
4990 cpu_to_le32(EXT4_GOOD_OLD_REV
))
4993 raw_inode
->i_generation
= cpu_to_le32(inode
->i_generation
);
4994 if (S_ISCHR(inode
->i_mode
) || S_ISBLK(inode
->i_mode
)) {
4995 if (old_valid_dev(inode
->i_rdev
)) {
4996 raw_inode
->i_block
[0] =
4997 cpu_to_le32(old_encode_dev(inode
->i_rdev
));
4998 raw_inode
->i_block
[1] = 0;
5000 raw_inode
->i_block
[0] = 0;
5001 raw_inode
->i_block
[1] =
5002 cpu_to_le32(new_encode_dev(inode
->i_rdev
));
5003 raw_inode
->i_block
[2] = 0;
5005 } else if (!ext4_has_inline_data(inode
)) {
5006 for (block
= 0; block
< EXT4_N_BLOCKS
; block
++)
5007 raw_inode
->i_block
[block
] = ei
->i_data
[block
];
5010 if (likely(!test_opt2(inode
->i_sb
, HURD_COMPAT
))) {
5011 raw_inode
->i_disk_version
= cpu_to_le32(inode
->i_version
);
5012 if (ei
->i_extra_isize
) {
5013 if (EXT4_FITS_IN_INODE(raw_inode
, ei
, i_version_hi
))
5014 raw_inode
->i_version_hi
=
5015 cpu_to_le32(inode
->i_version
>> 32);
5016 raw_inode
->i_extra_isize
=
5017 cpu_to_le16(ei
->i_extra_isize
);
5021 BUG_ON(!ext4_has_feature_project(inode
->i_sb
) &&
5022 i_projid
!= EXT4_DEF_PROJID
);
5024 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
&&
5025 EXT4_FITS_IN_INODE(raw_inode
, ei
, i_projid
))
5026 raw_inode
->i_projid
= cpu_to_le32(i_projid
);
5028 ext4_inode_csum_set(inode
, raw_inode
, ei
);
5029 spin_unlock(&ei
->i_raw_lock
);
5030 if (inode
->i_sb
->s_flags
& MS_LAZYTIME
)
5031 ext4_update_other_inodes_time(inode
->i_sb
, inode
->i_ino
,
5034 BUFFER_TRACE(bh
, "call ext4_handle_dirty_metadata");
5035 rc
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
5038 ext4_clear_inode_state(inode
, EXT4_STATE_NEW
);
5039 if (set_large_file
) {
5040 BUFFER_TRACE(EXT4_SB(sb
)->s_sbh
, "get write access");
5041 err
= ext4_journal_get_write_access(handle
, EXT4_SB(sb
)->s_sbh
);
5044 ext4_update_dynamic_rev(sb
);
5045 ext4_set_feature_large_file(sb
);
5046 ext4_handle_sync(handle
);
5047 err
= ext4_handle_dirty_super(handle
, sb
);
5049 ext4_update_inode_fsync_trans(handle
, inode
, need_datasync
);
5052 ext4_std_error(inode
->i_sb
, err
);
5057 * ext4_write_inode()
5059 * We are called from a few places:
5061 * - Within generic_file_aio_write() -> generic_write_sync() for O_SYNC files.
5062 * Here, there will be no transaction running. We wait for any running
5063 * transaction to commit.
5065 * - Within flush work (sys_sync(), kupdate and such).
5066 * We wait on commit, if told to.
5068 * - Within iput_final() -> write_inode_now()
5069 * We wait on commit, if told to.
5071 * In all cases it is actually safe for us to return without doing anything,
5072 * because the inode has been copied into a raw inode buffer in
5073 * ext4_mark_inode_dirty(). This is a correctness thing for WB_SYNC_ALL
5076 * Note that we are absolutely dependent upon all inode dirtiers doing the
5077 * right thing: they *must* call mark_inode_dirty() after dirtying info in
5078 * which we are interested.
5080 * It would be a bug for them to not do this. The code:
5082 * mark_inode_dirty(inode)
5084 * inode->i_size = expr;
5086 * is in error because write_inode() could occur while `stuff()' is running,
5087 * and the new i_size will be lost. Plus the inode will no longer be on the
5088 * superblock's dirty inode list.
5090 int ext4_write_inode(struct inode
*inode
, struct writeback_control
*wbc
)
5094 if (WARN_ON_ONCE(current
->flags
& PF_MEMALLOC
))
5097 if (EXT4_SB(inode
->i_sb
)->s_journal
) {
5098 if (ext4_journal_current_handle()) {
5099 jbd_debug(1, "called recursively, non-PF_MEMALLOC!\n");
5105 * No need to force transaction in WB_SYNC_NONE mode. Also
5106 * ext4_sync_fs() will force the commit after everything is
5109 if (wbc
->sync_mode
!= WB_SYNC_ALL
|| wbc
->for_sync
)
5112 err
= ext4_force_commit(inode
->i_sb
);
5114 struct ext4_iloc iloc
;
5116 err
= __ext4_get_inode_loc(inode
, &iloc
, 0);
5120 * sync(2) will flush the whole buffer cache. No need to do
5121 * it here separately for each inode.
5123 if (wbc
->sync_mode
== WB_SYNC_ALL
&& !wbc
->for_sync
)
5124 sync_dirty_buffer(iloc
.bh
);
5125 if (buffer_req(iloc
.bh
) && !buffer_uptodate(iloc
.bh
)) {
5126 EXT4_ERROR_INODE_BLOCK(inode
, iloc
.bh
->b_blocknr
,
5127 "IO error syncing inode");
5136 * In data=journal mode ext4_journalled_invalidatepage() may fail to invalidate
5137 * buffers that are attached to a page stradding i_size and are undergoing
5138 * commit. In that case we have to wait for commit to finish and try again.
5140 static void ext4_wait_for_tail_page_commit(struct inode
*inode
)
5144 journal_t
*journal
= EXT4_SB(inode
->i_sb
)->s_journal
;
5145 tid_t commit_tid
= 0;
5148 offset
= inode
->i_size
& (PAGE_SIZE
- 1);
5150 * All buffers in the last page remain valid? Then there's nothing to
5151 * do. We do the check mainly to optimize the common PAGE_SIZE ==
5154 if (offset
> PAGE_SIZE
- (1 << inode
->i_blkbits
))
5157 page
= find_lock_page(inode
->i_mapping
,
5158 inode
->i_size
>> PAGE_SHIFT
);
5161 ret
= __ext4_journalled_invalidatepage(page
, offset
,
5162 PAGE_SIZE
- offset
);
5168 read_lock(&journal
->j_state_lock
);
5169 if (journal
->j_committing_transaction
)
5170 commit_tid
= journal
->j_committing_transaction
->t_tid
;
5171 read_unlock(&journal
->j_state_lock
);
5173 jbd2_log_wait_commit(journal
, commit_tid
);
5180 * Called from notify_change.
5182 * We want to trap VFS attempts to truncate the file as soon as
5183 * possible. In particular, we want to make sure that when the VFS
5184 * shrinks i_size, we put the inode on the orphan list and modify
5185 * i_disksize immediately, so that during the subsequent flushing of
5186 * dirty pages and freeing of disk blocks, we can guarantee that any
5187 * commit will leave the blocks being flushed in an unused state on
5188 * disk. (On recovery, the inode will get truncated and the blocks will
5189 * be freed, so we have a strong guarantee that no future commit will
5190 * leave these blocks visible to the user.)
5192 * Another thing we have to assure is that if we are in ordered mode
5193 * and inode is still attached to the committing transaction, we must
5194 * we start writeout of all the dirty pages which are being truncated.
5195 * This way we are sure that all the data written in the previous
5196 * transaction are already on disk (truncate waits for pages under
5199 * Called with inode->i_mutex down.
5201 int ext4_setattr(struct dentry
*dentry
, struct iattr
*attr
)
5203 struct inode
*inode
= d_inode(dentry
);
5206 const unsigned int ia_valid
= attr
->ia_valid
;
5208 error
= setattr_prepare(dentry
, attr
);
5212 if (is_quota_modification(inode
, attr
)) {
5213 error
= dquot_initialize(inode
);
5217 if ((ia_valid
& ATTR_UID
&& !uid_eq(attr
->ia_uid
, inode
->i_uid
)) ||
5218 (ia_valid
& ATTR_GID
&& !gid_eq(attr
->ia_gid
, inode
->i_gid
))) {
5221 /* (user+group)*(old+new) structure, inode write (sb,
5222 * inode block, ? - but truncate inode update has it) */
5223 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
,
5224 (EXT4_MAXQUOTAS_INIT_BLOCKS(inode
->i_sb
) +
5225 EXT4_MAXQUOTAS_DEL_BLOCKS(inode
->i_sb
)) + 3);
5226 if (IS_ERR(handle
)) {
5227 error
= PTR_ERR(handle
);
5230 error
= dquot_transfer(inode
, attr
);
5232 ext4_journal_stop(handle
);
5235 /* Update corresponding info in inode so that everything is in
5236 * one transaction */
5237 if (attr
->ia_valid
& ATTR_UID
)
5238 inode
->i_uid
= attr
->ia_uid
;
5239 if (attr
->ia_valid
& ATTR_GID
)
5240 inode
->i_gid
= attr
->ia_gid
;
5241 error
= ext4_mark_inode_dirty(handle
, inode
);
5242 ext4_journal_stop(handle
);
5245 if (attr
->ia_valid
& ATTR_SIZE
) {
5247 loff_t oldsize
= inode
->i_size
;
5248 int shrink
= (attr
->ia_size
<= inode
->i_size
);
5250 if (!(ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))) {
5251 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
5253 if (attr
->ia_size
> sbi
->s_bitmap_maxbytes
)
5256 if (!S_ISREG(inode
->i_mode
))
5259 if (IS_I_VERSION(inode
) && attr
->ia_size
!= inode
->i_size
)
5260 inode_inc_iversion(inode
);
5262 if (ext4_should_order_data(inode
) &&
5263 (attr
->ia_size
< inode
->i_size
)) {
5264 error
= ext4_begin_ordered_truncate(inode
,
5269 if (attr
->ia_size
!= inode
->i_size
) {
5270 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 3);
5271 if (IS_ERR(handle
)) {
5272 error
= PTR_ERR(handle
);
5275 if (ext4_handle_valid(handle
) && shrink
) {
5276 error
= ext4_orphan_add(handle
, inode
);
5280 * Update c/mtime on truncate up, ext4_truncate() will
5281 * update c/mtime in shrink case below
5284 inode
->i_mtime
= current_time(inode
);
5285 inode
->i_ctime
= inode
->i_mtime
;
5287 down_write(&EXT4_I(inode
)->i_data_sem
);
5288 EXT4_I(inode
)->i_disksize
= attr
->ia_size
;
5289 rc
= ext4_mark_inode_dirty(handle
, inode
);
5293 * We have to update i_size under i_data_sem together
5294 * with i_disksize to avoid races with writeback code
5295 * running ext4_wb_update_i_disksize().
5298 i_size_write(inode
, attr
->ia_size
);
5299 up_write(&EXT4_I(inode
)->i_data_sem
);
5300 ext4_journal_stop(handle
);
5303 ext4_orphan_del(NULL
, inode
);
5308 pagecache_isize_extended(inode
, oldsize
, inode
->i_size
);
5311 * Blocks are going to be removed from the inode. Wait
5312 * for dio in flight. Temporarily disable
5313 * dioread_nolock to prevent livelock.
5316 if (!ext4_should_journal_data(inode
)) {
5317 ext4_inode_block_unlocked_dio(inode
);
5318 inode_dio_wait(inode
);
5319 ext4_inode_resume_unlocked_dio(inode
);
5321 ext4_wait_for_tail_page_commit(inode
);
5323 down_write(&EXT4_I(inode
)->i_mmap_sem
);
5325 * Truncate pagecache after we've waited for commit
5326 * in data=journal mode to make pages freeable.
5328 truncate_pagecache(inode
, inode
->i_size
);
5330 rc
= ext4_truncate(inode
);
5334 up_write(&EXT4_I(inode
)->i_mmap_sem
);
5338 setattr_copy(inode
, attr
);
5339 mark_inode_dirty(inode
);
5343 * If the call to ext4_truncate failed to get a transaction handle at
5344 * all, we need to clean up the in-core orphan list manually.
5346 if (orphan
&& inode
->i_nlink
)
5347 ext4_orphan_del(NULL
, inode
);
5349 if (!error
&& (ia_valid
& ATTR_MODE
))
5350 rc
= posix_acl_chmod(inode
, inode
->i_mode
);
5353 ext4_std_error(inode
->i_sb
, error
);
5359 int ext4_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
,
5362 struct inode
*inode
;
5363 unsigned long long delalloc_blocks
;
5365 inode
= d_inode(dentry
);
5366 generic_fillattr(inode
, stat
);
5369 * If there is inline data in the inode, the inode will normally not
5370 * have data blocks allocated (it may have an external xattr block).
5371 * Report at least one sector for such files, so tools like tar, rsync,
5372 * others doen't incorrectly think the file is completely sparse.
5374 if (unlikely(ext4_has_inline_data(inode
)))
5375 stat
->blocks
+= (stat
->size
+ 511) >> 9;
5378 * We can't update i_blocks if the block allocation is delayed
5379 * otherwise in the case of system crash before the real block
5380 * allocation is done, we will have i_blocks inconsistent with
5381 * on-disk file blocks.
5382 * We always keep i_blocks updated together with real
5383 * allocation. But to not confuse with user, stat
5384 * will return the blocks that include the delayed allocation
5385 * blocks for this file.
5387 delalloc_blocks
= EXT4_C2B(EXT4_SB(inode
->i_sb
),
5388 EXT4_I(inode
)->i_reserved_data_blocks
);
5389 stat
->blocks
+= delalloc_blocks
<< (inode
->i_sb
->s_blocksize_bits
- 9);
5393 static int ext4_index_trans_blocks(struct inode
*inode
, int lblocks
,
5396 if (!(ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)))
5397 return ext4_ind_trans_blocks(inode
, lblocks
);
5398 return ext4_ext_index_trans_blocks(inode
, pextents
);
5402 * Account for index blocks, block groups bitmaps and block group
5403 * descriptor blocks if modify datablocks and index blocks
5404 * worse case, the indexs blocks spread over different block groups
5406 * If datablocks are discontiguous, they are possible to spread over
5407 * different block groups too. If they are contiguous, with flexbg,
5408 * they could still across block group boundary.
5410 * Also account for superblock, inode, quota and xattr blocks
5412 static int ext4_meta_trans_blocks(struct inode
*inode
, int lblocks
,
5415 ext4_group_t groups
, ngroups
= ext4_get_groups_count(inode
->i_sb
);
5421 * How many index blocks need to touch to map @lblocks logical blocks
5422 * to @pextents physical extents?
5424 idxblocks
= ext4_index_trans_blocks(inode
, lblocks
, pextents
);
5429 * Now let's see how many group bitmaps and group descriptors need
5432 groups
= idxblocks
+ pextents
;
5434 if (groups
> ngroups
)
5436 if (groups
> EXT4_SB(inode
->i_sb
)->s_gdb_count
)
5437 gdpblocks
= EXT4_SB(inode
->i_sb
)->s_gdb_count
;
5439 /* bitmaps and block group descriptor blocks */
5440 ret
+= groups
+ gdpblocks
;
5442 /* Blocks for super block, inode, quota and xattr blocks */
5443 ret
+= EXT4_META_TRANS_BLOCKS(inode
->i_sb
);
5449 * Calculate the total number of credits to reserve to fit
5450 * the modification of a single pages into a single transaction,
5451 * which may include multiple chunks of block allocations.
5453 * This could be called via ext4_write_begin()
5455 * We need to consider the worse case, when
5456 * one new block per extent.
5458 int ext4_writepage_trans_blocks(struct inode
*inode
)
5460 int bpp
= ext4_journal_blocks_per_page(inode
);
5463 ret
= ext4_meta_trans_blocks(inode
, bpp
, bpp
);
5465 /* Account for data blocks for journalled mode */
5466 if (ext4_should_journal_data(inode
))
5472 * Calculate the journal credits for a chunk of data modification.
5474 * This is called from DIO, fallocate or whoever calling
5475 * ext4_map_blocks() to map/allocate a chunk of contiguous disk blocks.
5477 * journal buffers for data blocks are not included here, as DIO
5478 * and fallocate do no need to journal data buffers.
5480 int ext4_chunk_trans_blocks(struct inode
*inode
, int nrblocks
)
5482 return ext4_meta_trans_blocks(inode
, nrblocks
, 1);
5486 * The caller must have previously called ext4_reserve_inode_write().
5487 * Give this, we know that the caller already has write access to iloc->bh.
5489 int ext4_mark_iloc_dirty(handle_t
*handle
,
5490 struct inode
*inode
, struct ext4_iloc
*iloc
)
5494 if (IS_I_VERSION(inode
))
5495 inode_inc_iversion(inode
);
5497 /* the do_update_inode consumes one bh->b_count */
5500 /* ext4_do_update_inode() does jbd2_journal_dirty_metadata */
5501 err
= ext4_do_update_inode(handle
, inode
, iloc
);
5507 * On success, We end up with an outstanding reference count against
5508 * iloc->bh. This _must_ be cleaned up later.
5512 ext4_reserve_inode_write(handle_t
*handle
, struct inode
*inode
,
5513 struct ext4_iloc
*iloc
)
5517 err
= ext4_get_inode_loc(inode
, iloc
);
5519 BUFFER_TRACE(iloc
->bh
, "get_write_access");
5520 err
= ext4_journal_get_write_access(handle
, iloc
->bh
);
5526 ext4_std_error(inode
->i_sb
, err
);
5531 * Expand an inode by new_extra_isize bytes.
5532 * Returns 0 on success or negative error number on failure.
5534 static int ext4_expand_extra_isize(struct inode
*inode
,
5535 unsigned int new_extra_isize
,
5536 struct ext4_iloc iloc
,
5539 struct ext4_inode
*raw_inode
;
5540 struct ext4_xattr_ibody_header
*header
;
5542 if (EXT4_I(inode
)->i_extra_isize
>= new_extra_isize
)
5545 raw_inode
= ext4_raw_inode(&iloc
);
5547 header
= IHDR(inode
, raw_inode
);
5549 /* No extended attributes present */
5550 if (!ext4_test_inode_state(inode
, EXT4_STATE_XATTR
) ||
5551 header
->h_magic
!= cpu_to_le32(EXT4_XATTR_MAGIC
)) {
5552 memset((void *)raw_inode
+ EXT4_GOOD_OLD_INODE_SIZE
, 0,
5554 EXT4_I(inode
)->i_extra_isize
= new_extra_isize
;
5558 /* try to expand with EAs present */
5559 return ext4_expand_extra_isize_ea(inode
, new_extra_isize
,
5564 * What we do here is to mark the in-core inode as clean with respect to inode
5565 * dirtiness (it may still be data-dirty).
5566 * This means that the in-core inode may be reaped by prune_icache
5567 * without having to perform any I/O. This is a very good thing,
5568 * because *any* task may call prune_icache - even ones which
5569 * have a transaction open against a different journal.
5571 * Is this cheating? Not really. Sure, we haven't written the
5572 * inode out, but prune_icache isn't a user-visible syncing function.
5573 * Whenever the user wants stuff synced (sys_sync, sys_msync, sys_fsync)
5574 * we start and wait on commits.
5576 int ext4_mark_inode_dirty(handle_t
*handle
, struct inode
*inode
)
5578 struct ext4_iloc iloc
;
5579 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
5580 static unsigned int mnt_count
;
5584 trace_ext4_mark_inode_dirty(inode
, _RET_IP_
);
5585 err
= ext4_reserve_inode_write(handle
, inode
, &iloc
);
5588 if (EXT4_I(inode
)->i_extra_isize
< sbi
->s_want_extra_isize
&&
5589 !ext4_test_inode_state(inode
, EXT4_STATE_NO_EXPAND
)) {
5591 * In nojournal mode, we can immediately attempt to expand
5592 * the inode. When journaled, we first need to obtain extra
5593 * buffer credits since we may write into the EA block
5594 * with this same handle. If journal_extend fails, then it will
5595 * only result in a minor loss of functionality for that inode.
5596 * If this is felt to be critical, then e2fsck should be run to
5597 * force a large enough s_min_extra_isize.
5599 if (!ext4_handle_valid(handle
) ||
5600 jbd2_journal_extend(handle
,
5601 EXT4_DATA_TRANS_BLOCKS(inode
->i_sb
)) == 0) {
5602 ret
= ext4_expand_extra_isize(inode
,
5603 sbi
->s_want_extra_isize
,
5607 le16_to_cpu(sbi
->s_es
->s_mnt_count
)) {
5608 ext4_warning(inode
->i_sb
,
5609 "Unable to expand inode %lu. Delete"
5610 " some EAs or run e2fsck.",
5613 le16_to_cpu(sbi
->s_es
->s_mnt_count
);
5618 return ext4_mark_iloc_dirty(handle
, inode
, &iloc
);
5622 * ext4_dirty_inode() is called from __mark_inode_dirty()
5624 * We're really interested in the case where a file is being extended.
5625 * i_size has been changed by generic_commit_write() and we thus need
5626 * to include the updated inode in the current transaction.
5628 * Also, dquot_alloc_block() will always dirty the inode when blocks
5629 * are allocated to the file.
5631 * If the inode is marked synchronous, we don't honour that here - doing
5632 * so would cause a commit on atime updates, which we don't bother doing.
5633 * We handle synchronous inodes at the highest possible level.
5635 * If only the I_DIRTY_TIME flag is set, we can skip everything. If
5636 * I_DIRTY_TIME and I_DIRTY_SYNC is set, the only inode fields we need
5637 * to copy into the on-disk inode structure are the timestamp files.
5639 void ext4_dirty_inode(struct inode
*inode
, int flags
)
5643 if (flags
== I_DIRTY_TIME
)
5645 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 2);
5649 ext4_mark_inode_dirty(handle
, inode
);
5651 ext4_journal_stop(handle
);
5658 * Bind an inode's backing buffer_head into this transaction, to prevent
5659 * it from being flushed to disk early. Unlike
5660 * ext4_reserve_inode_write, this leaves behind no bh reference and
5661 * returns no iloc structure, so the caller needs to repeat the iloc
5662 * lookup to mark the inode dirty later.
5664 static int ext4_pin_inode(handle_t
*handle
, struct inode
*inode
)
5666 struct ext4_iloc iloc
;
5670 err
= ext4_get_inode_loc(inode
, &iloc
);
5672 BUFFER_TRACE(iloc
.bh
, "get_write_access");
5673 err
= jbd2_journal_get_write_access(handle
, iloc
.bh
);
5675 err
= ext4_handle_dirty_metadata(handle
,
5681 ext4_std_error(inode
->i_sb
, err
);
5686 int ext4_change_inode_journal_flag(struct inode
*inode
, int val
)
5691 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
5694 * We have to be very careful here: changing a data block's
5695 * journaling status dynamically is dangerous. If we write a
5696 * data block to the journal, change the status and then delete
5697 * that block, we risk forgetting to revoke the old log record
5698 * from the journal and so a subsequent replay can corrupt data.
5699 * So, first we make sure that the journal is empty and that
5700 * nobody is changing anything.
5703 journal
= EXT4_JOURNAL(inode
);
5706 if (is_journal_aborted(journal
))
5709 /* Wait for all existing dio workers */
5710 ext4_inode_block_unlocked_dio(inode
);
5711 inode_dio_wait(inode
);
5714 * Before flushing the journal and switching inode's aops, we have
5715 * to flush all dirty data the inode has. There can be outstanding
5716 * delayed allocations, there can be unwritten extents created by
5717 * fallocate or buffered writes in dioread_nolock mode covered by
5718 * dirty data which can be converted only after flushing the dirty
5719 * data (and journalled aops don't know how to handle these cases).
5722 down_write(&EXT4_I(inode
)->i_mmap_sem
);
5723 err
= filemap_write_and_wait(inode
->i_mapping
);
5725 up_write(&EXT4_I(inode
)->i_mmap_sem
);
5726 ext4_inode_resume_unlocked_dio(inode
);
5731 percpu_down_write(&sbi
->s_journal_flag_rwsem
);
5732 jbd2_journal_lock_updates(journal
);
5735 * OK, there are no updates running now, and all cached data is
5736 * synced to disk. We are now in a completely consistent state
5737 * which doesn't have anything in the journal, and we know that
5738 * no filesystem updates are running, so it is safe to modify
5739 * the inode's in-core data-journaling state flag now.
5743 ext4_set_inode_flag(inode
, EXT4_INODE_JOURNAL_DATA
);
5745 err
= jbd2_journal_flush(journal
);
5747 jbd2_journal_unlock_updates(journal
);
5748 percpu_up_write(&sbi
->s_journal_flag_rwsem
);
5749 ext4_inode_resume_unlocked_dio(inode
);
5752 ext4_clear_inode_flag(inode
, EXT4_INODE_JOURNAL_DATA
);
5754 ext4_set_aops(inode
);
5756 * Update inode->i_flags after EXT4_INODE_JOURNAL_DATA was updated.
5757 * E.g. S_DAX may get cleared / set.
5759 ext4_set_inode_flags(inode
);
5761 jbd2_journal_unlock_updates(journal
);
5762 percpu_up_write(&sbi
->s_journal_flag_rwsem
);
5765 up_write(&EXT4_I(inode
)->i_mmap_sem
);
5766 ext4_inode_resume_unlocked_dio(inode
);
5768 /* Finally we can mark the inode as dirty. */
5770 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 1);
5772 return PTR_ERR(handle
);
5774 err
= ext4_mark_inode_dirty(handle
, inode
);
5775 ext4_handle_sync(handle
);
5776 ext4_journal_stop(handle
);
5777 ext4_std_error(inode
->i_sb
, err
);
5782 static int ext4_bh_unmapped(handle_t
*handle
, struct buffer_head
*bh
)
5784 return !buffer_mapped(bh
);
5787 int ext4_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
5789 struct page
*page
= vmf
->page
;
5793 struct file
*file
= vma
->vm_file
;
5794 struct inode
*inode
= file_inode(file
);
5795 struct address_space
*mapping
= inode
->i_mapping
;
5797 get_block_t
*get_block
;
5800 sb_start_pagefault(inode
->i_sb
);
5801 file_update_time(vma
->vm_file
);
5803 down_read(&EXT4_I(inode
)->i_mmap_sem
);
5804 /* Delalloc case is easy... */
5805 if (test_opt(inode
->i_sb
, DELALLOC
) &&
5806 !ext4_should_journal_data(inode
) &&
5807 !ext4_nonda_switch(inode
->i_sb
)) {
5809 ret
= block_page_mkwrite(vma
, vmf
,
5810 ext4_da_get_block_prep
);
5811 } while (ret
== -ENOSPC
&&
5812 ext4_should_retry_alloc(inode
->i_sb
, &retries
));
5817 size
= i_size_read(inode
);
5818 /* Page got truncated from under us? */
5819 if (page
->mapping
!= mapping
|| page_offset(page
) > size
) {
5821 ret
= VM_FAULT_NOPAGE
;
5825 if (page
->index
== size
>> PAGE_SHIFT
)
5826 len
= size
& ~PAGE_MASK
;
5830 * Return if we have all the buffers mapped. This avoids the need to do
5831 * journal_start/journal_stop which can block and take a long time
5833 if (page_has_buffers(page
)) {
5834 if (!ext4_walk_page_buffers(NULL
, page_buffers(page
),
5836 ext4_bh_unmapped
)) {
5837 /* Wait so that we don't change page under IO */
5838 wait_for_stable_page(page
);
5839 ret
= VM_FAULT_LOCKED
;
5844 /* OK, we need to fill the hole... */
5845 if (ext4_should_dioread_nolock(inode
))
5846 get_block
= ext4_get_block_unwritten
;
5848 get_block
= ext4_get_block
;
5850 handle
= ext4_journal_start(inode
, EXT4_HT_WRITE_PAGE
,
5851 ext4_writepage_trans_blocks(inode
));
5852 if (IS_ERR(handle
)) {
5853 ret
= VM_FAULT_SIGBUS
;
5856 ret
= block_page_mkwrite(vma
, vmf
, get_block
);
5857 if (!ret
&& ext4_should_journal_data(inode
)) {
5858 if (ext4_walk_page_buffers(handle
, page_buffers(page
), 0,
5859 PAGE_SIZE
, NULL
, do_journal_get_write_access
)) {
5861 ret
= VM_FAULT_SIGBUS
;
5862 ext4_journal_stop(handle
);
5865 ext4_set_inode_state(inode
, EXT4_STATE_JDATA
);
5867 ext4_journal_stop(handle
);
5868 if (ret
== -ENOSPC
&& ext4_should_retry_alloc(inode
->i_sb
, &retries
))
5871 ret
= block_page_mkwrite_return(ret
);
5873 up_read(&EXT4_I(inode
)->i_mmap_sem
);
5874 sb_end_pagefault(inode
->i_sb
);
5878 int ext4_filemap_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
5880 struct inode
*inode
= file_inode(vma
->vm_file
);
5883 down_read(&EXT4_I(inode
)->i_mmap_sem
);
5884 err
= filemap_fault(vma
, vmf
);
5885 up_read(&EXT4_I(inode
)->i_mmap_sem
);
5891 * Find the first extent at or after @lblk in an inode that is not a hole.
5892 * Search for @map_len blocks at most. The extent is returned in @result.
5894 * The function returns 1 if we found an extent. The function returns 0 in
5895 * case there is no extent at or after @lblk and in that case also sets
5896 * @result->es_len to 0. In case of error, the error code is returned.
5898 int ext4_get_next_extent(struct inode
*inode
, ext4_lblk_t lblk
,
5899 unsigned int map_len
, struct extent_status
*result
)
5901 struct ext4_map_blocks map
;
5902 struct extent_status es
= {};
5906 map
.m_len
= map_len
;
5909 * For non-extent based files this loop may iterate several times since
5910 * we do not determine full hole size.
5912 while (map
.m_len
> 0) {
5913 ret
= ext4_map_blocks(NULL
, inode
, &map
, 0);
5916 /* There's extent covering m_lblk? Just return it. */
5920 ext4_es_store_pblock(result
, map
.m_pblk
);
5921 result
->es_lblk
= map
.m_lblk
;
5922 result
->es_len
= map
.m_len
;
5923 if (map
.m_flags
& EXT4_MAP_UNWRITTEN
)
5924 status
= EXTENT_STATUS_UNWRITTEN
;
5926 status
= EXTENT_STATUS_WRITTEN
;
5927 ext4_es_store_status(result
, status
);
5930 ext4_es_find_delayed_extent_range(inode
, map
.m_lblk
,
5931 map
.m_lblk
+ map
.m_len
- 1,
5933 /* Is delalloc data before next block in extent tree? */
5934 if (es
.es_len
&& es
.es_lblk
< map
.m_lblk
+ map
.m_len
) {
5935 ext4_lblk_t offset
= 0;
5937 if (es
.es_lblk
< lblk
)
5938 offset
= lblk
- es
.es_lblk
;
5939 result
->es_lblk
= es
.es_lblk
+ offset
;
5940 ext4_es_store_pblock(result
,
5941 ext4_es_pblock(&es
) + offset
);
5942 result
->es_len
= es
.es_len
- offset
;
5943 ext4_es_store_status(result
, ext4_es_status(&es
));
5947 /* There's a hole at m_lblk, advance us after it */
5948 map
.m_lblk
+= map
.m_len
;
5949 map_len
-= map
.m_len
;
5950 map
.m_len
= map_len
;