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/quotaops.h>
26 #include <linux/string.h>
27 #include <linux/buffer_head.h>
28 #include <linux/writeback.h>
29 #include <linux/pagevec.h>
30 #include <linux/mpage.h>
31 #include <linux/namei.h>
32 #include <linux/uio.h>
33 #include <linux/bio.h>
34 #include <linux/workqueue.h>
35 #include <linux/kernel.h>
36 #include <linux/printk.h>
37 #include <linux/slab.h>
38 #include <linux/bitops.h>
40 #include "ext4_jbd2.h"
45 #include <trace/events/ext4.h>
47 #define MPAGE_DA_EXTENT_TAIL 0x01
49 static __u32
ext4_inode_csum(struct inode
*inode
, struct ext4_inode
*raw
,
50 struct ext4_inode_info
*ei
)
52 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
57 csum_lo
= le16_to_cpu(raw
->i_checksum_lo
);
58 raw
->i_checksum_lo
= 0;
59 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
&&
60 EXT4_FITS_IN_INODE(raw
, ei
, i_checksum_hi
)) {
61 csum_hi
= le16_to_cpu(raw
->i_checksum_hi
);
62 raw
->i_checksum_hi
= 0;
65 csum
= ext4_chksum(sbi
, ei
->i_csum_seed
, (__u8
*)raw
,
66 EXT4_INODE_SIZE(inode
->i_sb
));
68 raw
->i_checksum_lo
= cpu_to_le16(csum_lo
);
69 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
&&
70 EXT4_FITS_IN_INODE(raw
, ei
, i_checksum_hi
))
71 raw
->i_checksum_hi
= cpu_to_le16(csum_hi
);
76 static int ext4_inode_csum_verify(struct inode
*inode
, struct ext4_inode
*raw
,
77 struct ext4_inode_info
*ei
)
79 __u32 provided
, calculated
;
81 if (EXT4_SB(inode
->i_sb
)->s_es
->s_creator_os
!=
82 cpu_to_le32(EXT4_OS_LINUX
) ||
83 !ext4_has_metadata_csum(inode
->i_sb
))
86 provided
= le16_to_cpu(raw
->i_checksum_lo
);
87 calculated
= ext4_inode_csum(inode
, raw
, ei
);
88 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
&&
89 EXT4_FITS_IN_INODE(raw
, ei
, i_checksum_hi
))
90 provided
|= ((__u32
)le16_to_cpu(raw
->i_checksum_hi
)) << 16;
94 return provided
== calculated
;
97 static void ext4_inode_csum_set(struct inode
*inode
, struct ext4_inode
*raw
,
98 struct ext4_inode_info
*ei
)
102 if (EXT4_SB(inode
->i_sb
)->s_es
->s_creator_os
!=
103 cpu_to_le32(EXT4_OS_LINUX
) ||
104 !ext4_has_metadata_csum(inode
->i_sb
))
107 csum
= ext4_inode_csum(inode
, raw
, ei
);
108 raw
->i_checksum_lo
= cpu_to_le16(csum
& 0xFFFF);
109 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
&&
110 EXT4_FITS_IN_INODE(raw
, ei
, i_checksum_hi
))
111 raw
->i_checksum_hi
= cpu_to_le16(csum
>> 16);
114 static inline int ext4_begin_ordered_truncate(struct inode
*inode
,
117 trace_ext4_begin_ordered_truncate(inode
, new_size
);
119 * If jinode is zero, then we never opened the file for
120 * writing, so there's no need to call
121 * jbd2_journal_begin_ordered_truncate() since there's no
122 * outstanding writes we need to flush.
124 if (!EXT4_I(inode
)->jinode
)
126 return jbd2_journal_begin_ordered_truncate(EXT4_JOURNAL(inode
),
127 EXT4_I(inode
)->jinode
,
131 static void ext4_invalidatepage(struct page
*page
, unsigned int offset
,
132 unsigned int length
);
133 static int __ext4_journalled_writepage(struct page
*page
, unsigned int len
);
134 static int ext4_bh_delay_or_unwritten(handle_t
*handle
, struct buffer_head
*bh
);
135 static int ext4_meta_trans_blocks(struct inode
*inode
, int lblocks
,
139 * Test whether an inode is a fast symlink.
141 int ext4_inode_is_fast_symlink(struct inode
*inode
)
143 int ea_blocks
= EXT4_I(inode
)->i_file_acl
?
144 EXT4_CLUSTER_SIZE(inode
->i_sb
) >> 9 : 0;
146 if (ext4_has_inline_data(inode
))
149 return (S_ISLNK(inode
->i_mode
) && inode
->i_blocks
- ea_blocks
== 0);
153 * Restart the transaction associated with *handle. This does a commit,
154 * so before we call here everything must be consistently dirtied against
157 int ext4_truncate_restart_trans(handle_t
*handle
, struct inode
*inode
,
163 * Drop i_data_sem to avoid deadlock with ext4_map_blocks. At this
164 * moment, get_block can be called only for blocks inside i_size since
165 * page cache has been already dropped and writes are blocked by
166 * i_mutex. So we can safely drop the i_data_sem here.
168 BUG_ON(EXT4_JOURNAL(inode
) == NULL
);
169 jbd_debug(2, "restarting handle %p\n", handle
);
170 up_write(&EXT4_I(inode
)->i_data_sem
);
171 ret
= ext4_journal_restart(handle
, nblocks
);
172 down_write(&EXT4_I(inode
)->i_data_sem
);
173 ext4_discard_preallocations(inode
);
179 * Called at the last iput() if i_nlink is zero.
181 void ext4_evict_inode(struct inode
*inode
)
186 trace_ext4_evict_inode(inode
);
188 if (inode
->i_nlink
) {
190 * When journalling data dirty buffers are tracked only in the
191 * journal. So although mm thinks everything is clean and
192 * ready for reaping the inode might still have some pages to
193 * write in the running transaction or waiting to be
194 * checkpointed. Thus calling jbd2_journal_invalidatepage()
195 * (via truncate_inode_pages()) to discard these buffers can
196 * cause data loss. Also even if we did not discard these
197 * buffers, we would have no way to find them after the inode
198 * is reaped and thus user could see stale data if he tries to
199 * read them before the transaction is checkpointed. So be
200 * careful and force everything to disk here... We use
201 * ei->i_datasync_tid to store the newest transaction
202 * containing inode's data.
204 * Note that directories do not have this problem because they
205 * don't use page cache.
207 if (ext4_should_journal_data(inode
) &&
208 (S_ISLNK(inode
->i_mode
) || S_ISREG(inode
->i_mode
)) &&
209 inode
->i_ino
!= EXT4_JOURNAL_INO
) {
210 journal_t
*journal
= EXT4_SB(inode
->i_sb
)->s_journal
;
211 tid_t commit_tid
= EXT4_I(inode
)->i_datasync_tid
;
213 jbd2_complete_transaction(journal
, commit_tid
);
214 filemap_write_and_wait(&inode
->i_data
);
216 truncate_inode_pages_final(&inode
->i_data
);
218 WARN_ON(atomic_read(&EXT4_I(inode
)->i_ioend_count
));
222 if (is_bad_inode(inode
))
224 dquot_initialize(inode
);
226 if (ext4_should_order_data(inode
))
227 ext4_begin_ordered_truncate(inode
, 0);
228 truncate_inode_pages_final(&inode
->i_data
);
230 WARN_ON(atomic_read(&EXT4_I(inode
)->i_ioend_count
));
233 * Protect us against freezing - iput() caller didn't have to have any
234 * protection against it
236 sb_start_intwrite(inode
->i_sb
);
237 handle
= ext4_journal_start(inode
, EXT4_HT_TRUNCATE
,
238 ext4_blocks_for_truncate(inode
)+3);
239 if (IS_ERR(handle
)) {
240 ext4_std_error(inode
->i_sb
, PTR_ERR(handle
));
242 * If we're going to skip the normal cleanup, we still need to
243 * make sure that the in-core orphan linked list is properly
246 ext4_orphan_del(NULL
, inode
);
247 sb_end_intwrite(inode
->i_sb
);
252 ext4_handle_sync(handle
);
254 err
= ext4_mark_inode_dirty(handle
, inode
);
256 ext4_warning(inode
->i_sb
,
257 "couldn't mark inode dirty (err %d)", err
);
261 ext4_truncate(inode
);
264 * ext4_ext_truncate() doesn't reserve any slop when it
265 * restarts journal transactions; therefore there may not be
266 * enough credits left in the handle to remove the inode from
267 * the orphan list and set the dtime field.
269 if (!ext4_handle_has_enough_credits(handle
, 3)) {
270 err
= ext4_journal_extend(handle
, 3);
272 err
= ext4_journal_restart(handle
, 3);
274 ext4_warning(inode
->i_sb
,
275 "couldn't extend journal (err %d)", err
);
277 ext4_journal_stop(handle
);
278 ext4_orphan_del(NULL
, inode
);
279 sb_end_intwrite(inode
->i_sb
);
285 * Kill off the orphan record which ext4_truncate created.
286 * AKPM: I think this can be inside the above `if'.
287 * Note that ext4_orphan_del() has to be able to cope with the
288 * deletion of a non-existent orphan - this is because we don't
289 * know if ext4_truncate() actually created an orphan record.
290 * (Well, we could do this if we need to, but heck - it works)
292 ext4_orphan_del(handle
, inode
);
293 EXT4_I(inode
)->i_dtime
= get_seconds();
296 * One subtle ordering requirement: if anything has gone wrong
297 * (transaction abort, IO errors, whatever), then we can still
298 * do these next steps (the fs will already have been marked as
299 * having errors), but we can't free the inode if the mark_dirty
302 if (ext4_mark_inode_dirty(handle
, inode
))
303 /* If that failed, just do the required in-core inode clear. */
304 ext4_clear_inode(inode
);
306 ext4_free_inode(handle
, inode
);
307 ext4_journal_stop(handle
);
308 sb_end_intwrite(inode
->i_sb
);
311 ext4_clear_inode(inode
); /* We must guarantee clearing of inode... */
315 qsize_t
*ext4_get_reserved_space(struct inode
*inode
)
317 return &EXT4_I(inode
)->i_reserved_quota
;
322 * Called with i_data_sem down, which is important since we can call
323 * ext4_discard_preallocations() from here.
325 void ext4_da_update_reserve_space(struct inode
*inode
,
326 int used
, int quota_claim
)
328 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
329 struct ext4_inode_info
*ei
= EXT4_I(inode
);
331 spin_lock(&ei
->i_block_reservation_lock
);
332 trace_ext4_da_update_reserve_space(inode
, used
, quota_claim
);
333 if (unlikely(used
> ei
->i_reserved_data_blocks
)) {
334 ext4_warning(inode
->i_sb
, "%s: ino %lu, used %d "
335 "with only %d reserved data blocks",
336 __func__
, inode
->i_ino
, used
,
337 ei
->i_reserved_data_blocks
);
339 used
= ei
->i_reserved_data_blocks
;
342 /* Update per-inode reservations */
343 ei
->i_reserved_data_blocks
-= used
;
344 percpu_counter_sub(&sbi
->s_dirtyclusters_counter
, used
);
346 spin_unlock(&EXT4_I(inode
)->i_block_reservation_lock
);
348 /* Update quota subsystem for data blocks */
350 dquot_claim_block(inode
, EXT4_C2B(sbi
, used
));
353 * We did fallocate with an offset that is already delayed
354 * allocated. So on delayed allocated writeback we should
355 * not re-claim the quota for fallocated blocks.
357 dquot_release_reservation_block(inode
, EXT4_C2B(sbi
, used
));
361 * If we have done all the pending block allocations and if
362 * there aren't any writers on the inode, we can discard the
363 * inode's preallocations.
365 if ((ei
->i_reserved_data_blocks
== 0) &&
366 (atomic_read(&inode
->i_writecount
) == 0))
367 ext4_discard_preallocations(inode
);
370 static int __check_block_validity(struct inode
*inode
, const char *func
,
372 struct ext4_map_blocks
*map
)
374 if (!ext4_data_block_valid(EXT4_SB(inode
->i_sb
), map
->m_pblk
,
376 ext4_error_inode(inode
, func
, line
, map
->m_pblk
,
377 "lblock %lu mapped to illegal pblock "
378 "(length %d)", (unsigned long) map
->m_lblk
,
385 #define check_block_validity(inode, map) \
386 __check_block_validity((inode), __func__, __LINE__, (map))
388 #ifdef ES_AGGRESSIVE_TEST
389 static void ext4_map_blocks_es_recheck(handle_t
*handle
,
391 struct ext4_map_blocks
*es_map
,
392 struct ext4_map_blocks
*map
,
399 * There is a race window that the result is not the same.
400 * e.g. xfstests #223 when dioread_nolock enables. The reason
401 * is that we lookup a block mapping in extent status tree with
402 * out taking i_data_sem. So at the time the unwritten extent
403 * could be converted.
405 if (!(flags
& EXT4_GET_BLOCKS_NO_LOCK
))
406 down_read(&EXT4_I(inode
)->i_data_sem
);
407 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)) {
408 retval
= ext4_ext_map_blocks(handle
, inode
, map
, flags
&
409 EXT4_GET_BLOCKS_KEEP_SIZE
);
411 retval
= ext4_ind_map_blocks(handle
, inode
, map
, flags
&
412 EXT4_GET_BLOCKS_KEEP_SIZE
);
414 if (!(flags
& EXT4_GET_BLOCKS_NO_LOCK
))
415 up_read((&EXT4_I(inode
)->i_data_sem
));
418 * We don't check m_len because extent will be collpased in status
419 * tree. So the m_len might not equal.
421 if (es_map
->m_lblk
!= map
->m_lblk
||
422 es_map
->m_flags
!= map
->m_flags
||
423 es_map
->m_pblk
!= map
->m_pblk
) {
424 printk("ES cache assertion failed for inode: %lu "
425 "es_cached ex [%d/%d/%llu/%x] != "
426 "found ex [%d/%d/%llu/%x] retval %d flags %x\n",
427 inode
->i_ino
, es_map
->m_lblk
, es_map
->m_len
,
428 es_map
->m_pblk
, es_map
->m_flags
, map
->m_lblk
,
429 map
->m_len
, map
->m_pblk
, map
->m_flags
,
433 #endif /* ES_AGGRESSIVE_TEST */
436 * The ext4_map_blocks() function tries to look up the requested blocks,
437 * and returns if the blocks are already mapped.
439 * Otherwise it takes the write lock of the i_data_sem and allocate blocks
440 * and store the allocated blocks in the result buffer head and mark it
443 * If file type is extents based, it will call ext4_ext_map_blocks(),
444 * Otherwise, call with ext4_ind_map_blocks() to handle indirect mapping
447 * On success, it returns the number of blocks being mapped or allocated.
448 * if create==0 and the blocks are pre-allocated and unwritten block,
449 * the result buffer head is unmapped. If the create ==1, it will make sure
450 * the buffer head is mapped.
452 * It returns 0 if plain look up failed (blocks have not been allocated), in
453 * that case, buffer head is unmapped
455 * It returns the error in case of allocation failure.
457 int ext4_map_blocks(handle_t
*handle
, struct inode
*inode
,
458 struct ext4_map_blocks
*map
, int flags
)
460 struct extent_status es
;
463 #ifdef ES_AGGRESSIVE_TEST
464 struct ext4_map_blocks orig_map
;
466 memcpy(&orig_map
, map
, sizeof(*map
));
470 ext_debug("ext4_map_blocks(): inode %lu, flag %d, max_blocks %u,"
471 "logical block %lu\n", inode
->i_ino
, flags
, map
->m_len
,
472 (unsigned long) map
->m_lblk
);
475 * ext4_map_blocks returns an int, and m_len is an unsigned int
477 if (unlikely(map
->m_len
> INT_MAX
))
478 map
->m_len
= INT_MAX
;
480 /* We can handle the block number less than EXT_MAX_BLOCKS */
481 if (unlikely(map
->m_lblk
>= EXT_MAX_BLOCKS
))
484 /* Lookup extent status tree firstly */
485 if (ext4_es_lookup_extent(inode
, map
->m_lblk
, &es
)) {
486 if (ext4_es_is_written(&es
) || ext4_es_is_unwritten(&es
)) {
487 map
->m_pblk
= ext4_es_pblock(&es
) +
488 map
->m_lblk
- es
.es_lblk
;
489 map
->m_flags
|= ext4_es_is_written(&es
) ?
490 EXT4_MAP_MAPPED
: EXT4_MAP_UNWRITTEN
;
491 retval
= es
.es_len
- (map
->m_lblk
- es
.es_lblk
);
492 if (retval
> map
->m_len
)
495 } else if (ext4_es_is_delayed(&es
) || ext4_es_is_hole(&es
)) {
500 #ifdef ES_AGGRESSIVE_TEST
501 ext4_map_blocks_es_recheck(handle
, inode
, map
,
508 * Try to see if we can get the block without requesting a new
511 if (!(flags
& EXT4_GET_BLOCKS_NO_LOCK
))
512 down_read(&EXT4_I(inode
)->i_data_sem
);
513 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)) {
514 retval
= ext4_ext_map_blocks(handle
, inode
, map
, flags
&
515 EXT4_GET_BLOCKS_KEEP_SIZE
);
517 retval
= ext4_ind_map_blocks(handle
, inode
, map
, flags
&
518 EXT4_GET_BLOCKS_KEEP_SIZE
);
523 if (unlikely(retval
!= map
->m_len
)) {
524 ext4_warning(inode
->i_sb
,
525 "ES len assertion failed for inode "
526 "%lu: retval %d != map->m_len %d",
527 inode
->i_ino
, retval
, map
->m_len
);
531 status
= map
->m_flags
& EXT4_MAP_UNWRITTEN
?
532 EXTENT_STATUS_UNWRITTEN
: EXTENT_STATUS_WRITTEN
;
533 if (!(flags
& EXT4_GET_BLOCKS_DELALLOC_RESERVE
) &&
534 ext4_find_delalloc_range(inode
, map
->m_lblk
,
535 map
->m_lblk
+ map
->m_len
- 1))
536 status
|= EXTENT_STATUS_DELAYED
;
537 ret
= ext4_es_insert_extent(inode
, map
->m_lblk
,
538 map
->m_len
, map
->m_pblk
, status
);
542 if (!(flags
& EXT4_GET_BLOCKS_NO_LOCK
))
543 up_read((&EXT4_I(inode
)->i_data_sem
));
546 if (retval
> 0 && map
->m_flags
& EXT4_MAP_MAPPED
) {
547 ret
= check_block_validity(inode
, map
);
552 /* If it is only a block(s) look up */
553 if ((flags
& EXT4_GET_BLOCKS_CREATE
) == 0)
557 * Returns if the blocks have already allocated
559 * Note that if blocks have been preallocated
560 * ext4_ext_get_block() returns the create = 0
561 * with buffer head unmapped.
563 if (retval
> 0 && map
->m_flags
& EXT4_MAP_MAPPED
)
565 * If we need to convert extent to unwritten
566 * we continue and do the actual work in
567 * ext4_ext_map_blocks()
569 if (!(flags
& EXT4_GET_BLOCKS_CONVERT_UNWRITTEN
))
573 * Here we clear m_flags because after allocating an new extent,
574 * it will be set again.
576 map
->m_flags
&= ~EXT4_MAP_FLAGS
;
579 * New blocks allocate and/or writing to unwritten extent
580 * will possibly result in updating i_data, so we take
581 * the write lock of i_data_sem, and call get_block()
582 * with create == 1 flag.
584 down_write(&EXT4_I(inode
)->i_data_sem
);
587 * We need to check for EXT4 here because migrate
588 * could have changed the inode type in between
590 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)) {
591 retval
= ext4_ext_map_blocks(handle
, inode
, map
, flags
);
593 retval
= ext4_ind_map_blocks(handle
, inode
, map
, flags
);
595 if (retval
> 0 && map
->m_flags
& EXT4_MAP_NEW
) {
597 * We allocated new blocks which will result in
598 * i_data's format changing. Force the migrate
599 * to fail by clearing migrate flags
601 ext4_clear_inode_state(inode
, EXT4_STATE_EXT_MIGRATE
);
605 * Update reserved blocks/metadata blocks after successful
606 * block allocation which had been deferred till now. We don't
607 * support fallocate for non extent files. So we can update
608 * reserve space here.
611 (flags
& EXT4_GET_BLOCKS_DELALLOC_RESERVE
))
612 ext4_da_update_reserve_space(inode
, retval
, 1);
618 if (unlikely(retval
!= map
->m_len
)) {
619 ext4_warning(inode
->i_sb
,
620 "ES len assertion failed for inode "
621 "%lu: retval %d != map->m_len %d",
622 inode
->i_ino
, retval
, map
->m_len
);
627 * If the extent has been zeroed out, we don't need to update
628 * extent status tree.
630 if ((flags
& EXT4_GET_BLOCKS_PRE_IO
) &&
631 ext4_es_lookup_extent(inode
, map
->m_lblk
, &es
)) {
632 if (ext4_es_is_written(&es
))
635 status
= map
->m_flags
& EXT4_MAP_UNWRITTEN
?
636 EXTENT_STATUS_UNWRITTEN
: EXTENT_STATUS_WRITTEN
;
637 if (!(flags
& EXT4_GET_BLOCKS_DELALLOC_RESERVE
) &&
638 ext4_find_delalloc_range(inode
, map
->m_lblk
,
639 map
->m_lblk
+ map
->m_len
- 1))
640 status
|= EXTENT_STATUS_DELAYED
;
641 ret
= ext4_es_insert_extent(inode
, map
->m_lblk
, map
->m_len
,
642 map
->m_pblk
, status
);
648 up_write((&EXT4_I(inode
)->i_data_sem
));
649 if (retval
> 0 && map
->m_flags
& EXT4_MAP_MAPPED
) {
650 ret
= check_block_validity(inode
, map
);
657 static void ext4_end_io_unwritten(struct buffer_head
*bh
, int uptodate
)
659 struct inode
*inode
= bh
->b_assoc_map
->host
;
660 /* XXX: breaks on 32-bit > 16GB. Is that even supported? */
661 loff_t offset
= (loff_t
)(uintptr_t)bh
->b_private
<< inode
->i_blkbits
;
665 WARN_ON(!buffer_unwritten(bh
));
666 err
= ext4_convert_unwritten_extents(NULL
, inode
, offset
, bh
->b_size
);
669 /* Maximum number of blocks we map for direct IO at once. */
670 #define DIO_MAX_BLOCKS 4096
672 static int _ext4_get_block(struct inode
*inode
, sector_t iblock
,
673 struct buffer_head
*bh
, int flags
)
675 handle_t
*handle
= ext4_journal_current_handle();
676 struct ext4_map_blocks map
;
677 int ret
= 0, started
= 0;
680 if (ext4_has_inline_data(inode
))
684 map
.m_len
= bh
->b_size
>> inode
->i_blkbits
;
686 if (flags
&& !(flags
& EXT4_GET_BLOCKS_NO_LOCK
) && !handle
) {
687 /* Direct IO write... */
688 if (map
.m_len
> DIO_MAX_BLOCKS
)
689 map
.m_len
= DIO_MAX_BLOCKS
;
690 dio_credits
= ext4_chunk_trans_blocks(inode
, map
.m_len
);
691 handle
= ext4_journal_start(inode
, EXT4_HT_MAP_BLOCKS
,
693 if (IS_ERR(handle
)) {
694 ret
= PTR_ERR(handle
);
700 ret
= ext4_map_blocks(handle
, inode
, &map
, flags
);
702 ext4_io_end_t
*io_end
= ext4_inode_aio(inode
);
704 map_bh(bh
, inode
->i_sb
, map
.m_pblk
);
705 bh
->b_state
= (bh
->b_state
& ~EXT4_MAP_FLAGS
) | map
.m_flags
;
706 if (IS_DAX(inode
) && buffer_unwritten(bh
) && !io_end
) {
707 bh
->b_assoc_map
= inode
->i_mapping
;
708 bh
->b_private
= (void *)(unsigned long)iblock
;
709 bh
->b_end_io
= ext4_end_io_unwritten
;
711 if (io_end
&& io_end
->flag
& EXT4_IO_END_UNWRITTEN
)
712 set_buffer_defer_completion(bh
);
713 bh
->b_size
= inode
->i_sb
->s_blocksize
* map
.m_len
;
717 ext4_journal_stop(handle
);
721 int ext4_get_block(struct inode
*inode
, sector_t iblock
,
722 struct buffer_head
*bh
, int create
)
724 return _ext4_get_block(inode
, iblock
, bh
,
725 create
? EXT4_GET_BLOCKS_CREATE
: 0);
729 * `handle' can be NULL if create is zero
731 struct buffer_head
*ext4_getblk(handle_t
*handle
, struct inode
*inode
,
732 ext4_lblk_t block
, int create
)
734 struct ext4_map_blocks map
;
735 struct buffer_head
*bh
;
738 J_ASSERT(handle
!= NULL
|| create
== 0);
742 err
= ext4_map_blocks(handle
, inode
, &map
,
743 create
? EXT4_GET_BLOCKS_CREATE
: 0);
746 return create
? ERR_PTR(-ENOSPC
) : NULL
;
750 bh
= sb_getblk(inode
->i_sb
, map
.m_pblk
);
752 return ERR_PTR(-ENOMEM
);
753 if (map
.m_flags
& EXT4_MAP_NEW
) {
754 J_ASSERT(create
!= 0);
755 J_ASSERT(handle
!= NULL
);
758 * Now that we do not always journal data, we should
759 * keep in mind whether this should always journal the
760 * new buffer as metadata. For now, regular file
761 * writes use ext4_get_block instead, so it's not a
765 BUFFER_TRACE(bh
, "call get_create_access");
766 err
= ext4_journal_get_create_access(handle
, bh
);
771 if (!buffer_uptodate(bh
)) {
772 memset(bh
->b_data
, 0, inode
->i_sb
->s_blocksize
);
773 set_buffer_uptodate(bh
);
776 BUFFER_TRACE(bh
, "call ext4_handle_dirty_metadata");
777 err
= ext4_handle_dirty_metadata(handle
, inode
, bh
);
781 BUFFER_TRACE(bh
, "not a new buffer");
788 struct buffer_head
*ext4_bread(handle_t
*handle
, struct inode
*inode
,
789 ext4_lblk_t block
, int create
)
791 struct buffer_head
*bh
;
793 bh
= ext4_getblk(handle
, inode
, block
, create
);
796 if (!bh
|| buffer_uptodate(bh
))
798 ll_rw_block(READ
| REQ_META
| REQ_PRIO
, 1, &bh
);
800 if (buffer_uptodate(bh
))
803 return ERR_PTR(-EIO
);
806 int ext4_walk_page_buffers(handle_t
*handle
,
807 struct buffer_head
*head
,
811 int (*fn
)(handle_t
*handle
,
812 struct buffer_head
*bh
))
814 struct buffer_head
*bh
;
815 unsigned block_start
, block_end
;
816 unsigned blocksize
= head
->b_size
;
818 struct buffer_head
*next
;
820 for (bh
= head
, block_start
= 0;
821 ret
== 0 && (bh
!= head
|| !block_start
);
822 block_start
= block_end
, bh
= next
) {
823 next
= bh
->b_this_page
;
824 block_end
= block_start
+ blocksize
;
825 if (block_end
<= from
|| block_start
>= to
) {
826 if (partial
&& !buffer_uptodate(bh
))
830 err
= (*fn
)(handle
, bh
);
838 * To preserve ordering, it is essential that the hole instantiation and
839 * the data write be encapsulated in a single transaction. We cannot
840 * close off a transaction and start a new one between the ext4_get_block()
841 * and the commit_write(). So doing the jbd2_journal_start at the start of
842 * prepare_write() is the right place.
844 * Also, this function can nest inside ext4_writepage(). In that case, we
845 * *know* that ext4_writepage() has generated enough buffer credits to do the
846 * whole page. So we won't block on the journal in that case, which is good,
847 * because the caller may be PF_MEMALLOC.
849 * By accident, ext4 can be reentered when a transaction is open via
850 * quota file writes. If we were to commit the transaction while thus
851 * reentered, there can be a deadlock - we would be holding a quota
852 * lock, and the commit would never complete if another thread had a
853 * transaction open and was blocking on the quota lock - a ranking
856 * So what we do is to rely on the fact that jbd2_journal_stop/journal_start
857 * will _not_ run commit under these circumstances because handle->h_ref
858 * is elevated. We'll still have enough credits for the tiny quotafile
861 int do_journal_get_write_access(handle_t
*handle
,
862 struct buffer_head
*bh
)
864 int dirty
= buffer_dirty(bh
);
867 if (!buffer_mapped(bh
) || buffer_freed(bh
))
870 * __block_write_begin() could have dirtied some buffers. Clean
871 * the dirty bit as jbd2_journal_get_write_access() could complain
872 * otherwise about fs integrity issues. Setting of the dirty bit
873 * by __block_write_begin() isn't a real problem here as we clear
874 * the bit before releasing a page lock and thus writeback cannot
875 * ever write the buffer.
878 clear_buffer_dirty(bh
);
879 BUFFER_TRACE(bh
, "get write access");
880 ret
= ext4_journal_get_write_access(handle
, bh
);
882 ret
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
886 static int ext4_get_block_write_nolock(struct inode
*inode
, sector_t iblock
,
887 struct buffer_head
*bh_result
, int create
);
889 #ifdef CONFIG_EXT4_FS_ENCRYPTION
890 static int ext4_block_write_begin(struct page
*page
, loff_t pos
, unsigned len
,
891 get_block_t
*get_block
)
893 unsigned from
= pos
& (PAGE_CACHE_SIZE
- 1);
894 unsigned to
= from
+ len
;
895 struct inode
*inode
= page
->mapping
->host
;
896 unsigned block_start
, block_end
;
899 unsigned blocksize
= inode
->i_sb
->s_blocksize
;
901 struct buffer_head
*bh
, *head
, *wait
[2], **wait_bh
= wait
;
902 bool decrypt
= false;
904 BUG_ON(!PageLocked(page
));
905 BUG_ON(from
> PAGE_CACHE_SIZE
);
906 BUG_ON(to
> PAGE_CACHE_SIZE
);
909 if (!page_has_buffers(page
))
910 create_empty_buffers(page
, blocksize
, 0);
911 head
= page_buffers(page
);
912 bbits
= ilog2(blocksize
);
913 block
= (sector_t
)page
->index
<< (PAGE_CACHE_SHIFT
- bbits
);
915 for (bh
= head
, block_start
= 0; bh
!= head
|| !block_start
;
916 block
++, block_start
= block_end
, bh
= bh
->b_this_page
) {
917 block_end
= block_start
+ blocksize
;
918 if (block_end
<= from
|| block_start
>= to
) {
919 if (PageUptodate(page
)) {
920 if (!buffer_uptodate(bh
))
921 set_buffer_uptodate(bh
);
926 clear_buffer_new(bh
);
927 if (!buffer_mapped(bh
)) {
928 WARN_ON(bh
->b_size
!= blocksize
);
929 err
= get_block(inode
, block
, bh
, 1);
932 if (buffer_new(bh
)) {
933 unmap_underlying_metadata(bh
->b_bdev
,
935 if (PageUptodate(page
)) {
936 clear_buffer_new(bh
);
937 set_buffer_uptodate(bh
);
938 mark_buffer_dirty(bh
);
941 if (block_end
> to
|| block_start
< from
)
942 zero_user_segments(page
, to
, block_end
,
947 if (PageUptodate(page
)) {
948 if (!buffer_uptodate(bh
))
949 set_buffer_uptodate(bh
);
952 if (!buffer_uptodate(bh
) && !buffer_delay(bh
) &&
953 !buffer_unwritten(bh
) &&
954 (block_start
< from
|| block_end
> to
)) {
955 ll_rw_block(READ
, 1, &bh
);
957 decrypt
= ext4_encrypted_inode(inode
) &&
958 S_ISREG(inode
->i_mode
);
962 * If we issued read requests, let them complete.
964 while (wait_bh
> wait
) {
965 wait_on_buffer(*--wait_bh
);
966 if (!buffer_uptodate(*wait_bh
))
970 page_zero_new_buffers(page
, from
, to
);
972 err
= ext4_decrypt_one(inode
, page
);
977 static int ext4_write_begin(struct file
*file
, struct address_space
*mapping
,
978 loff_t pos
, unsigned len
, unsigned flags
,
979 struct page
**pagep
, void **fsdata
)
981 struct inode
*inode
= mapping
->host
;
982 int ret
, needed_blocks
;
989 trace_ext4_write_begin(inode
, pos
, len
, flags
);
991 * Reserve one block more for addition to orphan list in case
992 * we allocate blocks but write fails for some reason
994 needed_blocks
= ext4_writepage_trans_blocks(inode
) + 1;
995 index
= pos
>> PAGE_CACHE_SHIFT
;
996 from
= pos
& (PAGE_CACHE_SIZE
- 1);
999 if (ext4_test_inode_state(inode
, EXT4_STATE_MAY_INLINE_DATA
)) {
1000 ret
= ext4_try_to_write_inline_data(mapping
, inode
, pos
, len
,
1009 * grab_cache_page_write_begin() can take a long time if the
1010 * system is thrashing due to memory pressure, or if the page
1011 * is being written back. So grab it first before we start
1012 * the transaction handle. This also allows us to allocate
1013 * the page (if needed) without using GFP_NOFS.
1016 page
= grab_cache_page_write_begin(mapping
, index
, flags
);
1022 handle
= ext4_journal_start(inode
, EXT4_HT_WRITE_PAGE
, needed_blocks
);
1023 if (IS_ERR(handle
)) {
1024 page_cache_release(page
);
1025 return PTR_ERR(handle
);
1029 if (page
->mapping
!= mapping
) {
1030 /* The page got truncated from under us */
1032 page_cache_release(page
);
1033 ext4_journal_stop(handle
);
1036 /* In case writeback began while the page was unlocked */
1037 wait_for_stable_page(page
);
1039 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1040 if (ext4_should_dioread_nolock(inode
))
1041 ret
= ext4_block_write_begin(page
, pos
, len
,
1042 ext4_get_block_write
);
1044 ret
= ext4_block_write_begin(page
, pos
, len
,
1047 if (ext4_should_dioread_nolock(inode
))
1048 ret
= __block_write_begin(page
, pos
, len
, ext4_get_block_write
);
1050 ret
= __block_write_begin(page
, pos
, len
, ext4_get_block
);
1052 if (!ret
&& ext4_should_journal_data(inode
)) {
1053 ret
= ext4_walk_page_buffers(handle
, page_buffers(page
),
1055 do_journal_get_write_access
);
1061 * __block_write_begin may have instantiated a few blocks
1062 * outside i_size. Trim these off again. Don't need
1063 * i_size_read because we hold i_mutex.
1065 * Add inode to orphan list in case we crash before
1068 if (pos
+ len
> inode
->i_size
&& ext4_can_truncate(inode
))
1069 ext4_orphan_add(handle
, inode
);
1071 ext4_journal_stop(handle
);
1072 if (pos
+ len
> inode
->i_size
) {
1073 ext4_truncate_failed_write(inode
);
1075 * If truncate failed early the inode might
1076 * still be on the orphan list; we need to
1077 * make sure the inode is removed from the
1078 * orphan list in that case.
1081 ext4_orphan_del(NULL
, inode
);
1084 if (ret
== -ENOSPC
&&
1085 ext4_should_retry_alloc(inode
->i_sb
, &retries
))
1087 page_cache_release(page
);
1094 /* For write_end() in data=journal mode */
1095 static int write_end_fn(handle_t
*handle
, struct buffer_head
*bh
)
1098 if (!buffer_mapped(bh
) || buffer_freed(bh
))
1100 set_buffer_uptodate(bh
);
1101 ret
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
1102 clear_buffer_meta(bh
);
1103 clear_buffer_prio(bh
);
1108 * We need to pick up the new inode size which generic_commit_write gave us
1109 * `file' can be NULL - eg, when called from page_symlink().
1111 * ext4 never places buffers on inode->i_mapping->private_list. metadata
1112 * buffers are managed internally.
1114 static int ext4_write_end(struct file
*file
,
1115 struct address_space
*mapping
,
1116 loff_t pos
, unsigned len
, unsigned copied
,
1117 struct page
*page
, void *fsdata
)
1119 handle_t
*handle
= ext4_journal_current_handle();
1120 struct inode
*inode
= mapping
->host
;
1121 loff_t old_size
= inode
->i_size
;
1123 int i_size_changed
= 0;
1125 trace_ext4_write_end(inode
, pos
, len
, copied
);
1126 if (ext4_test_inode_state(inode
, EXT4_STATE_ORDERED_MODE
)) {
1127 ret
= ext4_jbd2_file_inode(handle
, inode
);
1130 page_cache_release(page
);
1135 if (ext4_has_inline_data(inode
)) {
1136 ret
= ext4_write_inline_data_end(inode
, pos
, len
,
1142 copied
= block_write_end(file
, mapping
, pos
,
1143 len
, copied
, page
, fsdata
);
1145 * it's important to update i_size while still holding page lock:
1146 * page writeout could otherwise come in and zero beyond i_size.
1148 i_size_changed
= ext4_update_inode_size(inode
, pos
+ copied
);
1150 page_cache_release(page
);
1153 pagecache_isize_extended(inode
, old_size
, pos
);
1155 * Don't mark the inode dirty under page lock. First, it unnecessarily
1156 * makes the holding time of page lock longer. Second, it forces lock
1157 * ordering of page lock and transaction start for journaling
1161 ext4_mark_inode_dirty(handle
, inode
);
1163 if (pos
+ len
> inode
->i_size
&& ext4_can_truncate(inode
))
1164 /* if we have allocated more blocks and copied
1165 * less. We will have blocks allocated outside
1166 * inode->i_size. So truncate them
1168 ext4_orphan_add(handle
, inode
);
1170 ret2
= ext4_journal_stop(handle
);
1174 if (pos
+ len
> inode
->i_size
) {
1175 ext4_truncate_failed_write(inode
);
1177 * If truncate failed early the inode might still be
1178 * on the orphan list; we need to make sure the inode
1179 * is removed from the orphan list in that case.
1182 ext4_orphan_del(NULL
, inode
);
1185 return ret
? ret
: copied
;
1188 static int ext4_journalled_write_end(struct file
*file
,
1189 struct address_space
*mapping
,
1190 loff_t pos
, unsigned len
, unsigned copied
,
1191 struct page
*page
, void *fsdata
)
1193 handle_t
*handle
= ext4_journal_current_handle();
1194 struct inode
*inode
= mapping
->host
;
1195 loff_t old_size
= inode
->i_size
;
1199 int size_changed
= 0;
1201 trace_ext4_journalled_write_end(inode
, pos
, len
, copied
);
1202 from
= pos
& (PAGE_CACHE_SIZE
- 1);
1205 BUG_ON(!ext4_handle_valid(handle
));
1207 if (ext4_has_inline_data(inode
))
1208 copied
= ext4_write_inline_data_end(inode
, pos
, len
,
1212 if (!PageUptodate(page
))
1214 page_zero_new_buffers(page
, from
+copied
, to
);
1217 ret
= ext4_walk_page_buffers(handle
, page_buffers(page
), from
,
1218 to
, &partial
, write_end_fn
);
1220 SetPageUptodate(page
);
1222 size_changed
= ext4_update_inode_size(inode
, pos
+ copied
);
1223 ext4_set_inode_state(inode
, EXT4_STATE_JDATA
);
1224 EXT4_I(inode
)->i_datasync_tid
= handle
->h_transaction
->t_tid
;
1226 page_cache_release(page
);
1229 pagecache_isize_extended(inode
, old_size
, pos
);
1232 ret2
= ext4_mark_inode_dirty(handle
, inode
);
1237 if (pos
+ len
> inode
->i_size
&& ext4_can_truncate(inode
))
1238 /* if we have allocated more blocks and copied
1239 * less. We will have blocks allocated outside
1240 * inode->i_size. So truncate them
1242 ext4_orphan_add(handle
, inode
);
1244 ret2
= ext4_journal_stop(handle
);
1247 if (pos
+ len
> inode
->i_size
) {
1248 ext4_truncate_failed_write(inode
);
1250 * If truncate failed early the inode might still be
1251 * on the orphan list; we need to make sure the inode
1252 * is removed from the orphan list in that case.
1255 ext4_orphan_del(NULL
, inode
);
1258 return ret
? ret
: copied
;
1262 * Reserve a single cluster located at lblock
1264 static int ext4_da_reserve_space(struct inode
*inode
, ext4_lblk_t lblock
)
1266 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
1267 struct ext4_inode_info
*ei
= EXT4_I(inode
);
1268 unsigned int md_needed
;
1272 * We will charge metadata quota at writeout time; this saves
1273 * us from metadata over-estimation, though we may go over by
1274 * a small amount in the end. Here we just reserve for data.
1276 ret
= dquot_reserve_block(inode
, EXT4_C2B(sbi
, 1));
1281 * recalculate the amount of metadata blocks to reserve
1282 * in order to allocate nrblocks
1283 * worse case is one extent per block
1285 spin_lock(&ei
->i_block_reservation_lock
);
1287 * ext4_calc_metadata_amount() has side effects, which we have
1288 * to be prepared undo if we fail to claim space.
1291 trace_ext4_da_reserve_space(inode
, 0);
1293 if (ext4_claim_free_clusters(sbi
, 1, 0)) {
1294 spin_unlock(&ei
->i_block_reservation_lock
);
1295 dquot_release_reservation_block(inode
, EXT4_C2B(sbi
, 1));
1298 ei
->i_reserved_data_blocks
++;
1299 spin_unlock(&ei
->i_block_reservation_lock
);
1301 return 0; /* success */
1304 static void ext4_da_release_space(struct inode
*inode
, int to_free
)
1306 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
1307 struct ext4_inode_info
*ei
= EXT4_I(inode
);
1310 return; /* Nothing to release, exit */
1312 spin_lock(&EXT4_I(inode
)->i_block_reservation_lock
);
1314 trace_ext4_da_release_space(inode
, to_free
);
1315 if (unlikely(to_free
> ei
->i_reserved_data_blocks
)) {
1317 * if there aren't enough reserved blocks, then the
1318 * counter is messed up somewhere. Since this
1319 * function is called from invalidate page, it's
1320 * harmless to return without any action.
1322 ext4_warning(inode
->i_sb
, "ext4_da_release_space: "
1323 "ino %lu, to_free %d with only %d reserved "
1324 "data blocks", inode
->i_ino
, to_free
,
1325 ei
->i_reserved_data_blocks
);
1327 to_free
= ei
->i_reserved_data_blocks
;
1329 ei
->i_reserved_data_blocks
-= to_free
;
1331 /* update fs dirty data blocks counter */
1332 percpu_counter_sub(&sbi
->s_dirtyclusters_counter
, to_free
);
1334 spin_unlock(&EXT4_I(inode
)->i_block_reservation_lock
);
1336 dquot_release_reservation_block(inode
, EXT4_C2B(sbi
, to_free
));
1339 static void ext4_da_page_release_reservation(struct page
*page
,
1340 unsigned int offset
,
1341 unsigned int length
)
1344 struct buffer_head
*head
, *bh
;
1345 unsigned int curr_off
= 0;
1346 struct inode
*inode
= page
->mapping
->host
;
1347 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
1348 unsigned int stop
= offset
+ length
;
1352 BUG_ON(stop
> PAGE_CACHE_SIZE
|| stop
< length
);
1354 head
= page_buffers(page
);
1357 unsigned int next_off
= curr_off
+ bh
->b_size
;
1359 if (next_off
> stop
)
1362 if ((offset
<= curr_off
) && (buffer_delay(bh
))) {
1364 clear_buffer_delay(bh
);
1366 curr_off
= next_off
;
1367 } while ((bh
= bh
->b_this_page
) != head
);
1370 lblk
= page
->index
<< (PAGE_CACHE_SHIFT
- inode
->i_blkbits
);
1371 ext4_es_remove_extent(inode
, lblk
, to_release
);
1374 /* If we have released all the blocks belonging to a cluster, then we
1375 * need to release the reserved space for that cluster. */
1376 num_clusters
= EXT4_NUM_B2C(sbi
, to_release
);
1377 while (num_clusters
> 0) {
1378 lblk
= (page
->index
<< (PAGE_CACHE_SHIFT
- inode
->i_blkbits
)) +
1379 ((num_clusters
- 1) << sbi
->s_cluster_bits
);
1380 if (sbi
->s_cluster_ratio
== 1 ||
1381 !ext4_find_delalloc_cluster(inode
, lblk
))
1382 ext4_da_release_space(inode
, 1);
1389 * Delayed allocation stuff
1392 struct mpage_da_data
{
1393 struct inode
*inode
;
1394 struct writeback_control
*wbc
;
1396 pgoff_t first_page
; /* The first page to write */
1397 pgoff_t next_page
; /* Current page to examine */
1398 pgoff_t last_page
; /* Last page to examine */
1400 * Extent to map - this can be after first_page because that can be
1401 * fully mapped. We somewhat abuse m_flags to store whether the extent
1402 * is delalloc or unwritten.
1404 struct ext4_map_blocks map
;
1405 struct ext4_io_submit io_submit
; /* IO submission data */
1408 static void mpage_release_unused_pages(struct mpage_da_data
*mpd
,
1413 struct pagevec pvec
;
1414 struct inode
*inode
= mpd
->inode
;
1415 struct address_space
*mapping
= inode
->i_mapping
;
1417 /* This is necessary when next_page == 0. */
1418 if (mpd
->first_page
>= mpd
->next_page
)
1421 index
= mpd
->first_page
;
1422 end
= mpd
->next_page
- 1;
1424 ext4_lblk_t start
, last
;
1425 start
= index
<< (PAGE_CACHE_SHIFT
- inode
->i_blkbits
);
1426 last
= end
<< (PAGE_CACHE_SHIFT
- inode
->i_blkbits
);
1427 ext4_es_remove_extent(inode
, start
, last
- start
+ 1);
1430 pagevec_init(&pvec
, 0);
1431 while (index
<= end
) {
1432 nr_pages
= pagevec_lookup(&pvec
, mapping
, index
, PAGEVEC_SIZE
);
1435 for (i
= 0; i
< nr_pages
; i
++) {
1436 struct page
*page
= pvec
.pages
[i
];
1437 if (page
->index
> end
)
1439 BUG_ON(!PageLocked(page
));
1440 BUG_ON(PageWriteback(page
));
1442 block_invalidatepage(page
, 0, PAGE_CACHE_SIZE
);
1443 ClearPageUptodate(page
);
1447 index
= pvec
.pages
[nr_pages
- 1]->index
+ 1;
1448 pagevec_release(&pvec
);
1452 static void ext4_print_free_blocks(struct inode
*inode
)
1454 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
1455 struct super_block
*sb
= inode
->i_sb
;
1456 struct ext4_inode_info
*ei
= EXT4_I(inode
);
1458 ext4_msg(sb
, KERN_CRIT
, "Total free blocks count %lld",
1459 EXT4_C2B(EXT4_SB(inode
->i_sb
),
1460 ext4_count_free_clusters(sb
)));
1461 ext4_msg(sb
, KERN_CRIT
, "Free/Dirty block details");
1462 ext4_msg(sb
, KERN_CRIT
, "free_blocks=%lld",
1463 (long long) EXT4_C2B(EXT4_SB(sb
),
1464 percpu_counter_sum(&sbi
->s_freeclusters_counter
)));
1465 ext4_msg(sb
, KERN_CRIT
, "dirty_blocks=%lld",
1466 (long long) EXT4_C2B(EXT4_SB(sb
),
1467 percpu_counter_sum(&sbi
->s_dirtyclusters_counter
)));
1468 ext4_msg(sb
, KERN_CRIT
, "Block reservation details");
1469 ext4_msg(sb
, KERN_CRIT
, "i_reserved_data_blocks=%u",
1470 ei
->i_reserved_data_blocks
);
1474 static int ext4_bh_delay_or_unwritten(handle_t
*handle
, struct buffer_head
*bh
)
1476 return (buffer_delay(bh
) || buffer_unwritten(bh
)) && buffer_dirty(bh
);
1480 * This function is grabs code from the very beginning of
1481 * ext4_map_blocks, but assumes that the caller is from delayed write
1482 * time. This function looks up the requested blocks and sets the
1483 * buffer delay bit under the protection of i_data_sem.
1485 static int ext4_da_map_blocks(struct inode
*inode
, sector_t iblock
,
1486 struct ext4_map_blocks
*map
,
1487 struct buffer_head
*bh
)
1489 struct extent_status es
;
1491 sector_t invalid_block
= ~((sector_t
) 0xffff);
1492 #ifdef ES_AGGRESSIVE_TEST
1493 struct ext4_map_blocks orig_map
;
1495 memcpy(&orig_map
, map
, sizeof(*map
));
1498 if (invalid_block
< ext4_blocks_count(EXT4_SB(inode
->i_sb
)->s_es
))
1502 ext_debug("ext4_da_map_blocks(): inode %lu, max_blocks %u,"
1503 "logical block %lu\n", inode
->i_ino
, map
->m_len
,
1504 (unsigned long) map
->m_lblk
);
1506 /* Lookup extent status tree firstly */
1507 if (ext4_es_lookup_extent(inode
, iblock
, &es
)) {
1508 if (ext4_es_is_hole(&es
)) {
1510 down_read(&EXT4_I(inode
)->i_data_sem
);
1515 * Delayed extent could be allocated by fallocate.
1516 * So we need to check it.
1518 if (ext4_es_is_delayed(&es
) && !ext4_es_is_unwritten(&es
)) {
1519 map_bh(bh
, inode
->i_sb
, invalid_block
);
1521 set_buffer_delay(bh
);
1525 map
->m_pblk
= ext4_es_pblock(&es
) + iblock
- es
.es_lblk
;
1526 retval
= es
.es_len
- (iblock
- es
.es_lblk
);
1527 if (retval
> map
->m_len
)
1528 retval
= map
->m_len
;
1529 map
->m_len
= retval
;
1530 if (ext4_es_is_written(&es
))
1531 map
->m_flags
|= EXT4_MAP_MAPPED
;
1532 else if (ext4_es_is_unwritten(&es
))
1533 map
->m_flags
|= EXT4_MAP_UNWRITTEN
;
1537 #ifdef ES_AGGRESSIVE_TEST
1538 ext4_map_blocks_es_recheck(NULL
, inode
, map
, &orig_map
, 0);
1544 * Try to see if we can get the block without requesting a new
1545 * file system block.
1547 down_read(&EXT4_I(inode
)->i_data_sem
);
1548 if (ext4_has_inline_data(inode
))
1550 else if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))
1551 retval
= ext4_ext_map_blocks(NULL
, inode
, map
, 0);
1553 retval
= ext4_ind_map_blocks(NULL
, inode
, map
, 0);
1559 * XXX: __block_prepare_write() unmaps passed block,
1563 * If the block was allocated from previously allocated cluster,
1564 * then we don't need to reserve it again. However we still need
1565 * to reserve metadata for every block we're going to write.
1567 if (EXT4_SB(inode
->i_sb
)->s_cluster_ratio
<= 1 ||
1568 !ext4_find_delalloc_cluster(inode
, map
->m_lblk
)) {
1569 ret
= ext4_da_reserve_space(inode
, iblock
);
1571 /* not enough space to reserve */
1577 ret
= ext4_es_insert_extent(inode
, map
->m_lblk
, map
->m_len
,
1578 ~0, EXTENT_STATUS_DELAYED
);
1584 map_bh(bh
, inode
->i_sb
, invalid_block
);
1586 set_buffer_delay(bh
);
1587 } else if (retval
> 0) {
1589 unsigned int status
;
1591 if (unlikely(retval
!= map
->m_len
)) {
1592 ext4_warning(inode
->i_sb
,
1593 "ES len assertion failed for inode "
1594 "%lu: retval %d != map->m_len %d",
1595 inode
->i_ino
, retval
, map
->m_len
);
1599 status
= map
->m_flags
& EXT4_MAP_UNWRITTEN
?
1600 EXTENT_STATUS_UNWRITTEN
: EXTENT_STATUS_WRITTEN
;
1601 ret
= ext4_es_insert_extent(inode
, map
->m_lblk
, map
->m_len
,
1602 map
->m_pblk
, status
);
1608 up_read((&EXT4_I(inode
)->i_data_sem
));
1614 * This is a special get_block_t callback which is used by
1615 * ext4_da_write_begin(). It will either return mapped block or
1616 * reserve space for a single block.
1618 * For delayed buffer_head we have BH_Mapped, BH_New, BH_Delay set.
1619 * We also have b_blocknr = -1 and b_bdev initialized properly
1621 * For unwritten buffer_head we have BH_Mapped, BH_New, BH_Unwritten set.
1622 * We also have b_blocknr = physicalblock mapping unwritten extent and b_bdev
1623 * initialized properly.
1625 int ext4_da_get_block_prep(struct inode
*inode
, sector_t iblock
,
1626 struct buffer_head
*bh
, int create
)
1628 struct ext4_map_blocks map
;
1631 BUG_ON(create
== 0);
1632 BUG_ON(bh
->b_size
!= inode
->i_sb
->s_blocksize
);
1634 map
.m_lblk
= iblock
;
1638 * first, we need to know whether the block is allocated already
1639 * preallocated blocks are unmapped but should treated
1640 * the same as allocated blocks.
1642 ret
= ext4_da_map_blocks(inode
, iblock
, &map
, bh
);
1646 map_bh(bh
, inode
->i_sb
, map
.m_pblk
);
1647 bh
->b_state
= (bh
->b_state
& ~EXT4_MAP_FLAGS
) | map
.m_flags
;
1649 if (buffer_unwritten(bh
)) {
1650 /* A delayed write to unwritten bh should be marked
1651 * new and mapped. Mapped ensures that we don't do
1652 * get_block multiple times when we write to the same
1653 * offset and new ensures that we do proper zero out
1654 * for partial write.
1657 set_buffer_mapped(bh
);
1662 static int bget_one(handle_t
*handle
, struct buffer_head
*bh
)
1668 static int bput_one(handle_t
*handle
, struct buffer_head
*bh
)
1674 static int __ext4_journalled_writepage(struct page
*page
,
1677 struct address_space
*mapping
= page
->mapping
;
1678 struct inode
*inode
= mapping
->host
;
1679 struct buffer_head
*page_bufs
= NULL
;
1680 handle_t
*handle
= NULL
;
1681 int ret
= 0, err
= 0;
1682 int inline_data
= ext4_has_inline_data(inode
);
1683 struct buffer_head
*inode_bh
= NULL
;
1685 ClearPageChecked(page
);
1688 BUG_ON(page
->index
!= 0);
1689 BUG_ON(len
> ext4_get_max_inline_size(inode
));
1690 inode_bh
= ext4_journalled_write_inline_data(inode
, len
, page
);
1691 if (inode_bh
== NULL
)
1694 page_bufs
= page_buffers(page
);
1699 ext4_walk_page_buffers(handle
, page_bufs
, 0, len
,
1702 /* As soon as we unlock the page, it can go away, but we have
1703 * references to buffers so we are safe */
1706 handle
= ext4_journal_start(inode
, EXT4_HT_WRITE_PAGE
,
1707 ext4_writepage_trans_blocks(inode
));
1708 if (IS_ERR(handle
)) {
1709 ret
= PTR_ERR(handle
);
1713 BUG_ON(!ext4_handle_valid(handle
));
1716 BUFFER_TRACE(inode_bh
, "get write access");
1717 ret
= ext4_journal_get_write_access(handle
, inode_bh
);
1719 err
= ext4_handle_dirty_metadata(handle
, inode
, inode_bh
);
1722 ret
= ext4_walk_page_buffers(handle
, page_bufs
, 0, len
, NULL
,
1723 do_journal_get_write_access
);
1725 err
= ext4_walk_page_buffers(handle
, page_bufs
, 0, len
, NULL
,
1730 EXT4_I(inode
)->i_datasync_tid
= handle
->h_transaction
->t_tid
;
1731 err
= ext4_journal_stop(handle
);
1735 if (!ext4_has_inline_data(inode
))
1736 ext4_walk_page_buffers(NULL
, page_bufs
, 0, len
,
1738 ext4_set_inode_state(inode
, EXT4_STATE_JDATA
);
1745 * Note that we don't need to start a transaction unless we're journaling data
1746 * because we should have holes filled from ext4_page_mkwrite(). We even don't
1747 * need to file the inode to the transaction's list in ordered mode because if
1748 * we are writing back data added by write(), the inode is already there and if
1749 * we are writing back data modified via mmap(), no one guarantees in which
1750 * transaction the data will hit the disk. In case we are journaling data, we
1751 * cannot start transaction directly because transaction start ranks above page
1752 * lock so we have to do some magic.
1754 * This function can get called via...
1755 * - ext4_writepages after taking page lock (have journal handle)
1756 * - journal_submit_inode_data_buffers (no journal handle)
1757 * - shrink_page_list via the kswapd/direct reclaim (no journal handle)
1758 * - grab_page_cache when doing write_begin (have journal handle)
1760 * We don't do any block allocation in this function. If we have page with
1761 * multiple blocks we need to write those buffer_heads that are mapped. This
1762 * is important for mmaped based write. So if we do with blocksize 1K
1763 * truncate(f, 1024);
1764 * a = mmap(f, 0, 4096);
1766 * truncate(f, 4096);
1767 * we have in the page first buffer_head mapped via page_mkwrite call back
1768 * but other buffer_heads would be unmapped but dirty (dirty done via the
1769 * do_wp_page). So writepage should write the first block. If we modify
1770 * the mmap area beyond 1024 we will again get a page_fault and the
1771 * page_mkwrite callback will do the block allocation and mark the
1772 * buffer_heads mapped.
1774 * We redirty the page if we have any buffer_heads that is either delay or
1775 * unwritten in the page.
1777 * We can get recursively called as show below.
1779 * ext4_writepage() -> kmalloc() -> __alloc_pages() -> page_launder() ->
1782 * But since we don't do any block allocation we should not deadlock.
1783 * Page also have the dirty flag cleared so we don't get recurive page_lock.
1785 static int ext4_writepage(struct page
*page
,
1786 struct writeback_control
*wbc
)
1791 struct buffer_head
*page_bufs
= NULL
;
1792 struct inode
*inode
= page
->mapping
->host
;
1793 struct ext4_io_submit io_submit
;
1794 bool keep_towrite
= false;
1796 trace_ext4_writepage(page
);
1797 size
= i_size_read(inode
);
1798 if (page
->index
== size
>> PAGE_CACHE_SHIFT
)
1799 len
= size
& ~PAGE_CACHE_MASK
;
1801 len
= PAGE_CACHE_SIZE
;
1803 page_bufs
= page_buffers(page
);
1805 * We cannot do block allocation or other extent handling in this
1806 * function. If there are buffers needing that, we have to redirty
1807 * the page. But we may reach here when we do a journal commit via
1808 * journal_submit_inode_data_buffers() and in that case we must write
1809 * allocated buffers to achieve data=ordered mode guarantees.
1811 if (ext4_walk_page_buffers(NULL
, page_bufs
, 0, len
, NULL
,
1812 ext4_bh_delay_or_unwritten
)) {
1813 redirty_page_for_writepage(wbc
, page
);
1814 if (current
->flags
& PF_MEMALLOC
) {
1816 * For memory cleaning there's no point in writing only
1817 * some buffers. So just bail out. Warn if we came here
1818 * from direct reclaim.
1820 WARN_ON_ONCE((current
->flags
& (PF_MEMALLOC
|PF_KSWAPD
))
1825 keep_towrite
= true;
1828 if (PageChecked(page
) && ext4_should_journal_data(inode
))
1830 * It's mmapped pagecache. Add buffers and journal it. There
1831 * doesn't seem much point in redirtying the page here.
1833 return __ext4_journalled_writepage(page
, len
);
1835 ext4_io_submit_init(&io_submit
, wbc
);
1836 io_submit
.io_end
= ext4_init_io_end(inode
, GFP_NOFS
);
1837 if (!io_submit
.io_end
) {
1838 redirty_page_for_writepage(wbc
, page
);
1842 ret
= ext4_bio_write_page(&io_submit
, page
, len
, wbc
, keep_towrite
);
1843 ext4_io_submit(&io_submit
);
1844 /* Drop io_end reference we got from init */
1845 ext4_put_io_end_defer(io_submit
.io_end
);
1849 static int mpage_submit_page(struct mpage_da_data
*mpd
, struct page
*page
)
1852 loff_t size
= i_size_read(mpd
->inode
);
1855 BUG_ON(page
->index
!= mpd
->first_page
);
1856 if (page
->index
== size
>> PAGE_CACHE_SHIFT
)
1857 len
= size
& ~PAGE_CACHE_MASK
;
1859 len
= PAGE_CACHE_SIZE
;
1860 clear_page_dirty_for_io(page
);
1861 err
= ext4_bio_write_page(&mpd
->io_submit
, page
, len
, mpd
->wbc
, false);
1863 mpd
->wbc
->nr_to_write
--;
1869 #define BH_FLAGS ((1 << BH_Unwritten) | (1 << BH_Delay))
1872 * mballoc gives us at most this number of blocks...
1873 * XXX: That seems to be only a limitation of ext4_mb_normalize_request().
1874 * The rest of mballoc seems to handle chunks up to full group size.
1876 #define MAX_WRITEPAGES_EXTENT_LEN 2048
1879 * mpage_add_bh_to_extent - try to add bh to extent of blocks to map
1881 * @mpd - extent of blocks
1882 * @lblk - logical number of the block in the file
1883 * @bh - buffer head we want to add to the extent
1885 * The function is used to collect contig. blocks in the same state. If the
1886 * buffer doesn't require mapping for writeback and we haven't started the
1887 * extent of buffers to map yet, the function returns 'true' immediately - the
1888 * caller can write the buffer right away. Otherwise the function returns true
1889 * if the block has been added to the extent, false if the block couldn't be
1892 static bool mpage_add_bh_to_extent(struct mpage_da_data
*mpd
, ext4_lblk_t lblk
,
1893 struct buffer_head
*bh
)
1895 struct ext4_map_blocks
*map
= &mpd
->map
;
1897 /* Buffer that doesn't need mapping for writeback? */
1898 if (!buffer_dirty(bh
) || !buffer_mapped(bh
) ||
1899 (!buffer_delay(bh
) && !buffer_unwritten(bh
))) {
1900 /* So far no extent to map => we write the buffer right away */
1901 if (map
->m_len
== 0)
1906 /* First block in the extent? */
1907 if (map
->m_len
== 0) {
1910 map
->m_flags
= bh
->b_state
& BH_FLAGS
;
1914 /* Don't go larger than mballoc is willing to allocate */
1915 if (map
->m_len
>= MAX_WRITEPAGES_EXTENT_LEN
)
1918 /* Can we merge the block to our big extent? */
1919 if (lblk
== map
->m_lblk
+ map
->m_len
&&
1920 (bh
->b_state
& BH_FLAGS
) == map
->m_flags
) {
1928 * mpage_process_page_bufs - submit page buffers for IO or add them to extent
1930 * @mpd - extent of blocks for mapping
1931 * @head - the first buffer in the page
1932 * @bh - buffer we should start processing from
1933 * @lblk - logical number of the block in the file corresponding to @bh
1935 * Walk through page buffers from @bh upto @head (exclusive) and either submit
1936 * the page for IO if all buffers in this page were mapped and there's no
1937 * accumulated extent of buffers to map or add buffers in the page to the
1938 * extent of buffers to map. The function returns 1 if the caller can continue
1939 * by processing the next page, 0 if it should stop adding buffers to the
1940 * extent to map because we cannot extend it anymore. It can also return value
1941 * < 0 in case of error during IO submission.
1943 static int mpage_process_page_bufs(struct mpage_da_data
*mpd
,
1944 struct buffer_head
*head
,
1945 struct buffer_head
*bh
,
1948 struct inode
*inode
= mpd
->inode
;
1950 ext4_lblk_t blocks
= (i_size_read(inode
) + (1 << inode
->i_blkbits
) - 1)
1951 >> inode
->i_blkbits
;
1954 BUG_ON(buffer_locked(bh
));
1956 if (lblk
>= blocks
|| !mpage_add_bh_to_extent(mpd
, lblk
, bh
)) {
1957 /* Found extent to map? */
1960 /* Everything mapped so far and we hit EOF */
1963 } while (lblk
++, (bh
= bh
->b_this_page
) != head
);
1964 /* So far everything mapped? Submit the page for IO. */
1965 if (mpd
->map
.m_len
== 0) {
1966 err
= mpage_submit_page(mpd
, head
->b_page
);
1970 return lblk
< blocks
;
1974 * mpage_map_buffers - update buffers corresponding to changed extent and
1975 * submit fully mapped pages for IO
1977 * @mpd - description of extent to map, on return next extent to map
1979 * Scan buffers corresponding to changed extent (we expect corresponding pages
1980 * to be already locked) and update buffer state according to new extent state.
1981 * We map delalloc buffers to their physical location, clear unwritten bits,
1982 * and mark buffers as uninit when we perform writes to unwritten extents
1983 * and do extent conversion after IO is finished. If the last page is not fully
1984 * mapped, we update @map to the next extent in the last page that needs
1985 * mapping. Otherwise we submit the page for IO.
1987 static int mpage_map_and_submit_buffers(struct mpage_da_data
*mpd
)
1989 struct pagevec pvec
;
1991 struct inode
*inode
= mpd
->inode
;
1992 struct buffer_head
*head
, *bh
;
1993 int bpp_bits
= PAGE_CACHE_SHIFT
- inode
->i_blkbits
;
1999 start
= mpd
->map
.m_lblk
>> bpp_bits
;
2000 end
= (mpd
->map
.m_lblk
+ mpd
->map
.m_len
- 1) >> bpp_bits
;
2001 lblk
= start
<< bpp_bits
;
2002 pblock
= mpd
->map
.m_pblk
;
2004 pagevec_init(&pvec
, 0);
2005 while (start
<= end
) {
2006 nr_pages
= pagevec_lookup(&pvec
, inode
->i_mapping
, start
,
2010 for (i
= 0; i
< nr_pages
; i
++) {
2011 struct page
*page
= pvec
.pages
[i
];
2013 if (page
->index
> end
)
2015 /* Up to 'end' pages must be contiguous */
2016 BUG_ON(page
->index
!= start
);
2017 bh
= head
= page_buffers(page
);
2019 if (lblk
< mpd
->map
.m_lblk
)
2021 if (lblk
>= mpd
->map
.m_lblk
+ mpd
->map
.m_len
) {
2023 * Buffer after end of mapped extent.
2024 * Find next buffer in the page to map.
2027 mpd
->map
.m_flags
= 0;
2029 * FIXME: If dioread_nolock supports
2030 * blocksize < pagesize, we need to make
2031 * sure we add size mapped so far to
2032 * io_end->size as the following call
2033 * can submit the page for IO.
2035 err
= mpage_process_page_bufs(mpd
, head
,
2037 pagevec_release(&pvec
);
2042 if (buffer_delay(bh
)) {
2043 clear_buffer_delay(bh
);
2044 bh
->b_blocknr
= pblock
++;
2046 clear_buffer_unwritten(bh
);
2047 } while (lblk
++, (bh
= bh
->b_this_page
) != head
);
2050 * FIXME: This is going to break if dioread_nolock
2051 * supports blocksize < pagesize as we will try to
2052 * convert potentially unmapped parts of inode.
2054 mpd
->io_submit
.io_end
->size
+= PAGE_CACHE_SIZE
;
2055 /* Page fully mapped - let IO run! */
2056 err
= mpage_submit_page(mpd
, page
);
2058 pagevec_release(&pvec
);
2063 pagevec_release(&pvec
);
2065 /* Extent fully mapped and matches with page boundary. We are done. */
2067 mpd
->map
.m_flags
= 0;
2071 static int mpage_map_one_extent(handle_t
*handle
, struct mpage_da_data
*mpd
)
2073 struct inode
*inode
= mpd
->inode
;
2074 struct ext4_map_blocks
*map
= &mpd
->map
;
2075 int get_blocks_flags
;
2076 int err
, dioread_nolock
;
2078 trace_ext4_da_write_pages_extent(inode
, map
);
2080 * Call ext4_map_blocks() to allocate any delayed allocation blocks, or
2081 * to convert an unwritten extent to be initialized (in the case
2082 * where we have written into one or more preallocated blocks). It is
2083 * possible that we're going to need more metadata blocks than
2084 * previously reserved. However we must not fail because we're in
2085 * writeback and there is nothing we can do about it so it might result
2086 * in data loss. So use reserved blocks to allocate metadata if
2089 * We pass in the magic EXT4_GET_BLOCKS_DELALLOC_RESERVE if
2090 * the blocks in question are delalloc blocks. This indicates
2091 * that the blocks and quotas has already been checked when
2092 * the data was copied into the page cache.
2094 get_blocks_flags
= EXT4_GET_BLOCKS_CREATE
|
2095 EXT4_GET_BLOCKS_METADATA_NOFAIL
;
2096 dioread_nolock
= ext4_should_dioread_nolock(inode
);
2098 get_blocks_flags
|= EXT4_GET_BLOCKS_IO_CREATE_EXT
;
2099 if (map
->m_flags
& (1 << BH_Delay
))
2100 get_blocks_flags
|= EXT4_GET_BLOCKS_DELALLOC_RESERVE
;
2102 err
= ext4_map_blocks(handle
, inode
, map
, get_blocks_flags
);
2105 if (dioread_nolock
&& (map
->m_flags
& EXT4_MAP_UNWRITTEN
)) {
2106 if (!mpd
->io_submit
.io_end
->handle
&&
2107 ext4_handle_valid(handle
)) {
2108 mpd
->io_submit
.io_end
->handle
= handle
->h_rsv_handle
;
2109 handle
->h_rsv_handle
= NULL
;
2111 ext4_set_io_unwritten_flag(inode
, mpd
->io_submit
.io_end
);
2114 BUG_ON(map
->m_len
== 0);
2115 if (map
->m_flags
& EXT4_MAP_NEW
) {
2116 struct block_device
*bdev
= inode
->i_sb
->s_bdev
;
2119 for (i
= 0; i
< map
->m_len
; i
++)
2120 unmap_underlying_metadata(bdev
, map
->m_pblk
+ i
);
2126 * mpage_map_and_submit_extent - map extent starting at mpd->lblk of length
2127 * mpd->len and submit pages underlying it for IO
2129 * @handle - handle for journal operations
2130 * @mpd - extent to map
2131 * @give_up_on_write - we set this to true iff there is a fatal error and there
2132 * is no hope of writing the data. The caller should discard
2133 * dirty pages to avoid infinite loops.
2135 * The function maps extent starting at mpd->lblk of length mpd->len. If it is
2136 * delayed, blocks are allocated, if it is unwritten, we may need to convert
2137 * them to initialized or split the described range from larger unwritten
2138 * extent. Note that we need not map all the described range since allocation
2139 * can return less blocks or the range is covered by more unwritten extents. We
2140 * cannot map more because we are limited by reserved transaction credits. On
2141 * the other hand we always make sure that the last touched page is fully
2142 * mapped so that it can be written out (and thus forward progress is
2143 * guaranteed). After mapping we submit all mapped pages for IO.
2145 static int mpage_map_and_submit_extent(handle_t
*handle
,
2146 struct mpage_da_data
*mpd
,
2147 bool *give_up_on_write
)
2149 struct inode
*inode
= mpd
->inode
;
2150 struct ext4_map_blocks
*map
= &mpd
->map
;
2155 mpd
->io_submit
.io_end
->offset
=
2156 ((loff_t
)map
->m_lblk
) << inode
->i_blkbits
;
2158 err
= mpage_map_one_extent(handle
, mpd
);
2160 struct super_block
*sb
= inode
->i_sb
;
2162 if (EXT4_SB(sb
)->s_mount_flags
& EXT4_MF_FS_ABORTED
)
2163 goto invalidate_dirty_pages
;
2165 * Let the uper layers retry transient errors.
2166 * In the case of ENOSPC, if ext4_count_free_blocks()
2167 * is non-zero, a commit should free up blocks.
2169 if ((err
== -ENOMEM
) ||
2170 (err
== -ENOSPC
&& ext4_count_free_clusters(sb
))) {
2172 goto update_disksize
;
2175 ext4_msg(sb
, KERN_CRIT
,
2176 "Delayed block allocation failed for "
2177 "inode %lu at logical offset %llu with"
2178 " max blocks %u with error %d",
2180 (unsigned long long)map
->m_lblk
,
2181 (unsigned)map
->m_len
, -err
);
2182 ext4_msg(sb
, KERN_CRIT
,
2183 "This should not happen!! Data will "
2186 ext4_print_free_blocks(inode
);
2187 invalidate_dirty_pages
:
2188 *give_up_on_write
= true;
2193 * Update buffer state, submit mapped pages, and get us new
2196 err
= mpage_map_and_submit_buffers(mpd
);
2198 goto update_disksize
;
2199 } while (map
->m_len
);
2203 * Update on-disk size after IO is submitted. Races with
2204 * truncate are avoided by checking i_size under i_data_sem.
2206 disksize
= ((loff_t
)mpd
->first_page
) << PAGE_CACHE_SHIFT
;
2207 if (disksize
> EXT4_I(inode
)->i_disksize
) {
2211 down_write(&EXT4_I(inode
)->i_data_sem
);
2212 i_size
= i_size_read(inode
);
2213 if (disksize
> i_size
)
2215 if (disksize
> EXT4_I(inode
)->i_disksize
)
2216 EXT4_I(inode
)->i_disksize
= disksize
;
2217 err2
= ext4_mark_inode_dirty(handle
, inode
);
2218 up_write(&EXT4_I(inode
)->i_data_sem
);
2220 ext4_error(inode
->i_sb
,
2221 "Failed to mark inode %lu dirty",
2230 * Calculate the total number of credits to reserve for one writepages
2231 * iteration. This is called from ext4_writepages(). We map an extent of
2232 * up to MAX_WRITEPAGES_EXTENT_LEN blocks and then we go on and finish mapping
2233 * the last partial page. So in total we can map MAX_WRITEPAGES_EXTENT_LEN +
2234 * bpp - 1 blocks in bpp different extents.
2236 static int ext4_da_writepages_trans_blocks(struct inode
*inode
)
2238 int bpp
= ext4_journal_blocks_per_page(inode
);
2240 return ext4_meta_trans_blocks(inode
,
2241 MAX_WRITEPAGES_EXTENT_LEN
+ bpp
- 1, bpp
);
2245 * mpage_prepare_extent_to_map - find & lock contiguous range of dirty pages
2246 * and underlying extent to map
2248 * @mpd - where to look for pages
2250 * Walk dirty pages in the mapping. If they are fully mapped, submit them for
2251 * IO immediately. When we find a page which isn't mapped we start accumulating
2252 * extent of buffers underlying these pages that needs mapping (formed by
2253 * either delayed or unwritten buffers). We also lock the pages containing
2254 * these buffers. The extent found is returned in @mpd structure (starting at
2255 * mpd->lblk with length mpd->len blocks).
2257 * Note that this function can attach bios to one io_end structure which are
2258 * neither logically nor physically contiguous. Although it may seem as an
2259 * unnecessary complication, it is actually inevitable in blocksize < pagesize
2260 * case as we need to track IO to all buffers underlying a page in one io_end.
2262 static int mpage_prepare_extent_to_map(struct mpage_da_data
*mpd
)
2264 struct address_space
*mapping
= mpd
->inode
->i_mapping
;
2265 struct pagevec pvec
;
2266 unsigned int nr_pages
;
2267 long left
= mpd
->wbc
->nr_to_write
;
2268 pgoff_t index
= mpd
->first_page
;
2269 pgoff_t end
= mpd
->last_page
;
2272 int blkbits
= mpd
->inode
->i_blkbits
;
2274 struct buffer_head
*head
;
2276 if (mpd
->wbc
->sync_mode
== WB_SYNC_ALL
|| mpd
->wbc
->tagged_writepages
)
2277 tag
= PAGECACHE_TAG_TOWRITE
;
2279 tag
= PAGECACHE_TAG_DIRTY
;
2281 pagevec_init(&pvec
, 0);
2283 mpd
->next_page
= index
;
2284 while (index
<= end
) {
2285 nr_pages
= pagevec_lookup_tag(&pvec
, mapping
, &index
, tag
,
2286 min(end
- index
, (pgoff_t
)PAGEVEC_SIZE
-1) + 1);
2290 for (i
= 0; i
< nr_pages
; i
++) {
2291 struct page
*page
= pvec
.pages
[i
];
2294 * At this point, the page may be truncated or
2295 * invalidated (changing page->mapping to NULL), or
2296 * even swizzled back from swapper_space to tmpfs file
2297 * mapping. However, page->index will not change
2298 * because we have a reference on the page.
2300 if (page
->index
> end
)
2304 * Accumulated enough dirty pages? This doesn't apply
2305 * to WB_SYNC_ALL mode. For integrity sync we have to
2306 * keep going because someone may be concurrently
2307 * dirtying pages, and we might have synced a lot of
2308 * newly appeared dirty pages, but have not synced all
2309 * of the old dirty pages.
2311 if (mpd
->wbc
->sync_mode
== WB_SYNC_NONE
&& left
<= 0)
2314 /* If we can't merge this page, we are done. */
2315 if (mpd
->map
.m_len
> 0 && mpd
->next_page
!= page
->index
)
2320 * If the page is no longer dirty, or its mapping no
2321 * longer corresponds to inode we are writing (which
2322 * means it has been truncated or invalidated), or the
2323 * page is already under writeback and we are not doing
2324 * a data integrity writeback, skip the page
2326 if (!PageDirty(page
) ||
2327 (PageWriteback(page
) &&
2328 (mpd
->wbc
->sync_mode
== WB_SYNC_NONE
)) ||
2329 unlikely(page
->mapping
!= mapping
)) {
2334 wait_on_page_writeback(page
);
2335 BUG_ON(PageWriteback(page
));
2337 if (mpd
->map
.m_len
== 0)
2338 mpd
->first_page
= page
->index
;
2339 mpd
->next_page
= page
->index
+ 1;
2340 /* Add all dirty buffers to mpd */
2341 lblk
= ((ext4_lblk_t
)page
->index
) <<
2342 (PAGE_CACHE_SHIFT
- blkbits
);
2343 head
= page_buffers(page
);
2344 err
= mpage_process_page_bufs(mpd
, head
, head
, lblk
);
2350 pagevec_release(&pvec
);
2355 pagevec_release(&pvec
);
2359 static int __writepage(struct page
*page
, struct writeback_control
*wbc
,
2362 struct address_space
*mapping
= data
;
2363 int ret
= ext4_writepage(page
, wbc
);
2364 mapping_set_error(mapping
, ret
);
2368 static int ext4_writepages(struct address_space
*mapping
,
2369 struct writeback_control
*wbc
)
2371 pgoff_t writeback_index
= 0;
2372 long nr_to_write
= wbc
->nr_to_write
;
2373 int range_whole
= 0;
2375 handle_t
*handle
= NULL
;
2376 struct mpage_da_data mpd
;
2377 struct inode
*inode
= mapping
->host
;
2378 int needed_blocks
, rsv_blocks
= 0, ret
= 0;
2379 struct ext4_sb_info
*sbi
= EXT4_SB(mapping
->host
->i_sb
);
2381 struct blk_plug plug
;
2382 bool give_up_on_write
= false;
2384 trace_ext4_writepages(inode
, wbc
);
2387 * No pages to write? This is mainly a kludge to avoid starting
2388 * a transaction for special inodes like journal inode on last iput()
2389 * because that could violate lock ordering on umount
2391 if (!mapping
->nrpages
|| !mapping_tagged(mapping
, PAGECACHE_TAG_DIRTY
))
2392 goto out_writepages
;
2394 if (ext4_should_journal_data(inode
)) {
2395 struct blk_plug plug
;
2397 blk_start_plug(&plug
);
2398 ret
= write_cache_pages(mapping
, wbc
, __writepage
, mapping
);
2399 blk_finish_plug(&plug
);
2400 goto out_writepages
;
2404 * If the filesystem has aborted, it is read-only, so return
2405 * right away instead of dumping stack traces later on that
2406 * will obscure the real source of the problem. We test
2407 * EXT4_MF_FS_ABORTED instead of sb->s_flag's MS_RDONLY because
2408 * the latter could be true if the filesystem is mounted
2409 * read-only, and in that case, ext4_writepages should
2410 * *never* be called, so if that ever happens, we would want
2413 if (unlikely(sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
)) {
2415 goto out_writepages
;
2418 if (ext4_should_dioread_nolock(inode
)) {
2420 * We may need to convert up to one extent per block in
2421 * the page and we may dirty the inode.
2423 rsv_blocks
= 1 + (PAGE_CACHE_SIZE
>> inode
->i_blkbits
);
2427 * If we have inline data and arrive here, it means that
2428 * we will soon create the block for the 1st page, so
2429 * we'd better clear the inline data here.
2431 if (ext4_has_inline_data(inode
)) {
2432 /* Just inode will be modified... */
2433 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 1);
2434 if (IS_ERR(handle
)) {
2435 ret
= PTR_ERR(handle
);
2436 goto out_writepages
;
2438 BUG_ON(ext4_test_inode_state(inode
,
2439 EXT4_STATE_MAY_INLINE_DATA
));
2440 ext4_destroy_inline_data(handle
, inode
);
2441 ext4_journal_stop(handle
);
2444 if (wbc
->range_start
== 0 && wbc
->range_end
== LLONG_MAX
)
2447 if (wbc
->range_cyclic
) {
2448 writeback_index
= mapping
->writeback_index
;
2449 if (writeback_index
)
2451 mpd
.first_page
= writeback_index
;
2454 mpd
.first_page
= wbc
->range_start
>> PAGE_CACHE_SHIFT
;
2455 mpd
.last_page
= wbc
->range_end
>> PAGE_CACHE_SHIFT
;
2460 ext4_io_submit_init(&mpd
.io_submit
, wbc
);
2462 if (wbc
->sync_mode
== WB_SYNC_ALL
|| wbc
->tagged_writepages
)
2463 tag_pages_for_writeback(mapping
, mpd
.first_page
, mpd
.last_page
);
2465 blk_start_plug(&plug
);
2466 while (!done
&& mpd
.first_page
<= mpd
.last_page
) {
2467 /* For each extent of pages we use new io_end */
2468 mpd
.io_submit
.io_end
= ext4_init_io_end(inode
, GFP_KERNEL
);
2469 if (!mpd
.io_submit
.io_end
) {
2475 * We have two constraints: We find one extent to map and we
2476 * must always write out whole page (makes a difference when
2477 * blocksize < pagesize) so that we don't block on IO when we
2478 * try to write out the rest of the page. Journalled mode is
2479 * not supported by delalloc.
2481 BUG_ON(ext4_should_journal_data(inode
));
2482 needed_blocks
= ext4_da_writepages_trans_blocks(inode
);
2484 /* start a new transaction */
2485 handle
= ext4_journal_start_with_reserve(inode
,
2486 EXT4_HT_WRITE_PAGE
, needed_blocks
, rsv_blocks
);
2487 if (IS_ERR(handle
)) {
2488 ret
= PTR_ERR(handle
);
2489 ext4_msg(inode
->i_sb
, KERN_CRIT
, "%s: jbd2_start: "
2490 "%ld pages, ino %lu; err %d", __func__
,
2491 wbc
->nr_to_write
, inode
->i_ino
, ret
);
2492 /* Release allocated io_end */
2493 ext4_put_io_end(mpd
.io_submit
.io_end
);
2497 trace_ext4_da_write_pages(inode
, mpd
.first_page
, mpd
.wbc
);
2498 ret
= mpage_prepare_extent_to_map(&mpd
);
2501 ret
= mpage_map_and_submit_extent(handle
, &mpd
,
2505 * We scanned the whole range (or exhausted
2506 * nr_to_write), submitted what was mapped and
2507 * didn't find anything needing mapping. We are
2513 ext4_journal_stop(handle
);
2514 /* Submit prepared bio */
2515 ext4_io_submit(&mpd
.io_submit
);
2516 /* Unlock pages we didn't use */
2517 mpage_release_unused_pages(&mpd
, give_up_on_write
);
2518 /* Drop our io_end reference we got from init */
2519 ext4_put_io_end(mpd
.io_submit
.io_end
);
2521 if (ret
== -ENOSPC
&& sbi
->s_journal
) {
2523 * Commit the transaction which would
2524 * free blocks released in the transaction
2527 jbd2_journal_force_commit_nested(sbi
->s_journal
);
2531 /* Fatal error - ENOMEM, EIO... */
2535 blk_finish_plug(&plug
);
2536 if (!ret
&& !cycled
&& wbc
->nr_to_write
> 0) {
2538 mpd
.last_page
= writeback_index
- 1;
2544 if (wbc
->range_cyclic
|| (range_whole
&& wbc
->nr_to_write
> 0))
2546 * Set the writeback_index so that range_cyclic
2547 * mode will write it back later
2549 mapping
->writeback_index
= mpd
.first_page
;
2552 trace_ext4_writepages_result(inode
, wbc
, ret
,
2553 nr_to_write
- wbc
->nr_to_write
);
2557 static int ext4_nonda_switch(struct super_block
*sb
)
2559 s64 free_clusters
, dirty_clusters
;
2560 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2563 * switch to non delalloc mode if we are running low
2564 * on free block. The free block accounting via percpu
2565 * counters can get slightly wrong with percpu_counter_batch getting
2566 * accumulated on each CPU without updating global counters
2567 * Delalloc need an accurate free block accounting. So switch
2568 * to non delalloc when we are near to error range.
2571 percpu_counter_read_positive(&sbi
->s_freeclusters_counter
);
2573 percpu_counter_read_positive(&sbi
->s_dirtyclusters_counter
);
2575 * Start pushing delalloc when 1/2 of free blocks are dirty.
2577 if (dirty_clusters
&& (free_clusters
< 2 * dirty_clusters
))
2578 try_to_writeback_inodes_sb(sb
, WB_REASON_FS_FREE_SPACE
);
2580 if (2 * free_clusters
< 3 * dirty_clusters
||
2581 free_clusters
< (dirty_clusters
+ EXT4_FREECLUSTERS_WATERMARK
)) {
2583 * free block count is less than 150% of dirty blocks
2584 * or free blocks is less than watermark
2591 /* We always reserve for an inode update; the superblock could be there too */
2592 static int ext4_da_write_credits(struct inode
*inode
, loff_t pos
, unsigned len
)
2594 if (likely(EXT4_HAS_RO_COMPAT_FEATURE(inode
->i_sb
,
2595 EXT4_FEATURE_RO_COMPAT_LARGE_FILE
)))
2598 if (pos
+ len
<= 0x7fffffffULL
)
2601 /* We might need to update the superblock to set LARGE_FILE */
2605 static int ext4_da_write_begin(struct file
*file
, struct address_space
*mapping
,
2606 loff_t pos
, unsigned len
, unsigned flags
,
2607 struct page
**pagep
, void **fsdata
)
2609 int ret
, retries
= 0;
2612 struct inode
*inode
= mapping
->host
;
2615 index
= pos
>> PAGE_CACHE_SHIFT
;
2617 if (ext4_nonda_switch(inode
->i_sb
)) {
2618 *fsdata
= (void *)FALL_BACK_TO_NONDELALLOC
;
2619 return ext4_write_begin(file
, mapping
, pos
,
2620 len
, flags
, pagep
, fsdata
);
2622 *fsdata
= (void *)0;
2623 trace_ext4_da_write_begin(inode
, pos
, len
, flags
);
2625 if (ext4_test_inode_state(inode
, EXT4_STATE_MAY_INLINE_DATA
)) {
2626 ret
= ext4_da_write_inline_data_begin(mapping
, inode
,
2636 * grab_cache_page_write_begin() can take a long time if the
2637 * system is thrashing due to memory pressure, or if the page
2638 * is being written back. So grab it first before we start
2639 * the transaction handle. This also allows us to allocate
2640 * the page (if needed) without using GFP_NOFS.
2643 page
= grab_cache_page_write_begin(mapping
, index
, flags
);
2649 * With delayed allocation, we don't log the i_disksize update
2650 * if there is delayed block allocation. But we still need
2651 * to journalling the i_disksize update if writes to the end
2652 * of file which has an already mapped buffer.
2655 handle
= ext4_journal_start(inode
, EXT4_HT_WRITE_PAGE
,
2656 ext4_da_write_credits(inode
, pos
, len
));
2657 if (IS_ERR(handle
)) {
2658 page_cache_release(page
);
2659 return PTR_ERR(handle
);
2663 if (page
->mapping
!= mapping
) {
2664 /* The page got truncated from under us */
2666 page_cache_release(page
);
2667 ext4_journal_stop(handle
);
2670 /* In case writeback began while the page was unlocked */
2671 wait_for_stable_page(page
);
2673 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2674 ret
= ext4_block_write_begin(page
, pos
, len
,
2675 ext4_da_get_block_prep
);
2677 ret
= __block_write_begin(page
, pos
, len
, ext4_da_get_block_prep
);
2681 ext4_journal_stop(handle
);
2683 * block_write_begin may have instantiated a few blocks
2684 * outside i_size. Trim these off again. Don't need
2685 * i_size_read because we hold i_mutex.
2687 if (pos
+ len
> inode
->i_size
)
2688 ext4_truncate_failed_write(inode
);
2690 if (ret
== -ENOSPC
&&
2691 ext4_should_retry_alloc(inode
->i_sb
, &retries
))
2694 page_cache_release(page
);
2703 * Check if we should update i_disksize
2704 * when write to the end of file but not require block allocation
2706 static int ext4_da_should_update_i_disksize(struct page
*page
,
2707 unsigned long offset
)
2709 struct buffer_head
*bh
;
2710 struct inode
*inode
= page
->mapping
->host
;
2714 bh
= page_buffers(page
);
2715 idx
= offset
>> inode
->i_blkbits
;
2717 for (i
= 0; i
< idx
; i
++)
2718 bh
= bh
->b_this_page
;
2720 if (!buffer_mapped(bh
) || (buffer_delay(bh
)) || buffer_unwritten(bh
))
2725 static int ext4_da_write_end(struct file
*file
,
2726 struct address_space
*mapping
,
2727 loff_t pos
, unsigned len
, unsigned copied
,
2728 struct page
*page
, void *fsdata
)
2730 struct inode
*inode
= mapping
->host
;
2732 handle_t
*handle
= ext4_journal_current_handle();
2734 unsigned long start
, end
;
2735 int write_mode
= (int)(unsigned long)fsdata
;
2737 if (write_mode
== FALL_BACK_TO_NONDELALLOC
)
2738 return ext4_write_end(file
, mapping
, pos
,
2739 len
, copied
, page
, fsdata
);
2741 trace_ext4_da_write_end(inode
, pos
, len
, copied
);
2742 start
= pos
& (PAGE_CACHE_SIZE
- 1);
2743 end
= start
+ copied
- 1;
2746 * generic_write_end() will run mark_inode_dirty() if i_size
2747 * changes. So let's piggyback the i_disksize mark_inode_dirty
2750 new_i_size
= pos
+ copied
;
2751 if (copied
&& new_i_size
> EXT4_I(inode
)->i_disksize
) {
2752 if (ext4_has_inline_data(inode
) ||
2753 ext4_da_should_update_i_disksize(page
, end
)) {
2754 ext4_update_i_disksize(inode
, new_i_size
);
2755 /* We need to mark inode dirty even if
2756 * new_i_size is less that inode->i_size
2757 * bu greater than i_disksize.(hint delalloc)
2759 ext4_mark_inode_dirty(handle
, inode
);
2763 if (write_mode
!= CONVERT_INLINE_DATA
&&
2764 ext4_test_inode_state(inode
, EXT4_STATE_MAY_INLINE_DATA
) &&
2765 ext4_has_inline_data(inode
))
2766 ret2
= ext4_da_write_inline_data_end(inode
, pos
, len
, copied
,
2769 ret2
= generic_write_end(file
, mapping
, pos
, len
, copied
,
2775 ret2
= ext4_journal_stop(handle
);
2779 return ret
? ret
: copied
;
2782 static void ext4_da_invalidatepage(struct page
*page
, unsigned int offset
,
2783 unsigned int length
)
2786 * Drop reserved blocks
2788 BUG_ON(!PageLocked(page
));
2789 if (!page_has_buffers(page
))
2792 ext4_da_page_release_reservation(page
, offset
, length
);
2795 ext4_invalidatepage(page
, offset
, length
);
2801 * Force all delayed allocation blocks to be allocated for a given inode.
2803 int ext4_alloc_da_blocks(struct inode
*inode
)
2805 trace_ext4_alloc_da_blocks(inode
);
2807 if (!EXT4_I(inode
)->i_reserved_data_blocks
)
2811 * We do something simple for now. The filemap_flush() will
2812 * also start triggering a write of the data blocks, which is
2813 * not strictly speaking necessary (and for users of
2814 * laptop_mode, not even desirable). However, to do otherwise
2815 * would require replicating code paths in:
2817 * ext4_writepages() ->
2818 * write_cache_pages() ---> (via passed in callback function)
2819 * __mpage_da_writepage() -->
2820 * mpage_add_bh_to_extent()
2821 * mpage_da_map_blocks()
2823 * The problem is that write_cache_pages(), located in
2824 * mm/page-writeback.c, marks pages clean in preparation for
2825 * doing I/O, which is not desirable if we're not planning on
2828 * We could call write_cache_pages(), and then redirty all of
2829 * the pages by calling redirty_page_for_writepage() but that
2830 * would be ugly in the extreme. So instead we would need to
2831 * replicate parts of the code in the above functions,
2832 * simplifying them because we wouldn't actually intend to
2833 * write out the pages, but rather only collect contiguous
2834 * logical block extents, call the multi-block allocator, and
2835 * then update the buffer heads with the block allocations.
2837 * For now, though, we'll cheat by calling filemap_flush(),
2838 * which will map the blocks, and start the I/O, but not
2839 * actually wait for the I/O to complete.
2841 return filemap_flush(inode
->i_mapping
);
2845 * bmap() is special. It gets used by applications such as lilo and by
2846 * the swapper to find the on-disk block of a specific piece of data.
2848 * Naturally, this is dangerous if the block concerned is still in the
2849 * journal. If somebody makes a swapfile on an ext4 data-journaling
2850 * filesystem and enables swap, then they may get a nasty shock when the
2851 * data getting swapped to that swapfile suddenly gets overwritten by
2852 * the original zero's written out previously to the journal and
2853 * awaiting writeback in the kernel's buffer cache.
2855 * So, if we see any bmap calls here on a modified, data-journaled file,
2856 * take extra steps to flush any blocks which might be in the cache.
2858 static sector_t
ext4_bmap(struct address_space
*mapping
, sector_t block
)
2860 struct inode
*inode
= mapping
->host
;
2865 * We can get here for an inline file via the FIBMAP ioctl
2867 if (ext4_has_inline_data(inode
))
2870 if (mapping_tagged(mapping
, PAGECACHE_TAG_DIRTY
) &&
2871 test_opt(inode
->i_sb
, DELALLOC
)) {
2873 * With delalloc we want to sync the file
2874 * so that we can make sure we allocate
2877 filemap_write_and_wait(mapping
);
2880 if (EXT4_JOURNAL(inode
) &&
2881 ext4_test_inode_state(inode
, EXT4_STATE_JDATA
)) {
2883 * This is a REALLY heavyweight approach, but the use of
2884 * bmap on dirty files is expected to be extremely rare:
2885 * only if we run lilo or swapon on a freshly made file
2886 * do we expect this to happen.
2888 * (bmap requires CAP_SYS_RAWIO so this does not
2889 * represent an unprivileged user DOS attack --- we'd be
2890 * in trouble if mortal users could trigger this path at
2893 * NB. EXT4_STATE_JDATA is not set on files other than
2894 * regular files. If somebody wants to bmap a directory
2895 * or symlink and gets confused because the buffer
2896 * hasn't yet been flushed to disk, they deserve
2897 * everything they get.
2900 ext4_clear_inode_state(inode
, EXT4_STATE_JDATA
);
2901 journal
= EXT4_JOURNAL(inode
);
2902 jbd2_journal_lock_updates(journal
);
2903 err
= jbd2_journal_flush(journal
);
2904 jbd2_journal_unlock_updates(journal
);
2910 return generic_block_bmap(mapping
, block
, ext4_get_block
);
2913 static int ext4_readpage(struct file
*file
, struct page
*page
)
2916 struct inode
*inode
= page
->mapping
->host
;
2918 trace_ext4_readpage(page
);
2920 if (ext4_has_inline_data(inode
))
2921 ret
= ext4_readpage_inline(inode
, page
);
2924 return ext4_mpage_readpages(page
->mapping
, NULL
, page
, 1);
2930 ext4_readpages(struct file
*file
, struct address_space
*mapping
,
2931 struct list_head
*pages
, unsigned nr_pages
)
2933 struct inode
*inode
= mapping
->host
;
2935 /* If the file has inline data, no need to do readpages. */
2936 if (ext4_has_inline_data(inode
))
2939 return ext4_mpage_readpages(mapping
, pages
, NULL
, nr_pages
);
2942 static void ext4_invalidatepage(struct page
*page
, unsigned int offset
,
2943 unsigned int length
)
2945 trace_ext4_invalidatepage(page
, offset
, length
);
2947 /* No journalling happens on data buffers when this function is used */
2948 WARN_ON(page_has_buffers(page
) && buffer_jbd(page_buffers(page
)));
2950 block_invalidatepage(page
, offset
, length
);
2953 static int __ext4_journalled_invalidatepage(struct page
*page
,
2954 unsigned int offset
,
2955 unsigned int length
)
2957 journal_t
*journal
= EXT4_JOURNAL(page
->mapping
->host
);
2959 trace_ext4_journalled_invalidatepage(page
, offset
, length
);
2962 * If it's a full truncate we just forget about the pending dirtying
2964 if (offset
== 0 && length
== PAGE_CACHE_SIZE
)
2965 ClearPageChecked(page
);
2967 return jbd2_journal_invalidatepage(journal
, page
, offset
, length
);
2970 /* Wrapper for aops... */
2971 static void ext4_journalled_invalidatepage(struct page
*page
,
2972 unsigned int offset
,
2973 unsigned int length
)
2975 WARN_ON(__ext4_journalled_invalidatepage(page
, offset
, length
) < 0);
2978 static int ext4_releasepage(struct page
*page
, gfp_t wait
)
2980 journal_t
*journal
= EXT4_JOURNAL(page
->mapping
->host
);
2982 trace_ext4_releasepage(page
);
2984 /* Page has dirty journalled data -> cannot release */
2985 if (PageChecked(page
))
2988 return jbd2_journal_try_to_free_buffers(journal
, page
, wait
);
2990 return try_to_free_buffers(page
);
2994 * ext4_get_block used when preparing for a DIO write or buffer write.
2995 * We allocate an uinitialized extent if blocks haven't been allocated.
2996 * The extent will be converted to initialized after the IO is complete.
2998 int ext4_get_block_write(struct inode
*inode
, sector_t iblock
,
2999 struct buffer_head
*bh_result
, int create
)
3001 ext4_debug("ext4_get_block_write: inode %lu, create flag %d\n",
3002 inode
->i_ino
, create
);
3003 return _ext4_get_block(inode
, iblock
, bh_result
,
3004 EXT4_GET_BLOCKS_IO_CREATE_EXT
);
3007 static int ext4_get_block_write_nolock(struct inode
*inode
, sector_t iblock
,
3008 struct buffer_head
*bh_result
, int create
)
3010 ext4_debug("ext4_get_block_write_nolock: inode %lu, create flag %d\n",
3011 inode
->i_ino
, create
);
3012 return _ext4_get_block(inode
, iblock
, bh_result
,
3013 EXT4_GET_BLOCKS_NO_LOCK
);
3016 static void ext4_end_io_dio(struct kiocb
*iocb
, loff_t offset
,
3017 ssize_t size
, void *private)
3019 ext4_io_end_t
*io_end
= iocb
->private;
3021 /* if not async direct IO just return */
3025 ext_debug("ext4_end_io_dio(): io_end 0x%p "
3026 "for inode %lu, iocb 0x%p, offset %llu, size %zd\n",
3027 iocb
->private, io_end
->inode
->i_ino
, iocb
, offset
,
3030 iocb
->private = NULL
;
3031 io_end
->offset
= offset
;
3032 io_end
->size
= size
;
3033 ext4_put_io_end(io_end
);
3037 * For ext4 extent files, ext4 will do direct-io write to holes,
3038 * preallocated extents, and those write extend the file, no need to
3039 * fall back to buffered IO.
3041 * For holes, we fallocate those blocks, mark them as unwritten
3042 * If those blocks were preallocated, we mark sure they are split, but
3043 * still keep the range to write as unwritten.
3045 * The unwritten extents will be converted to written when DIO is completed.
3046 * For async direct IO, since the IO may still pending when return, we
3047 * set up an end_io call back function, which will do the conversion
3048 * when async direct IO completed.
3050 * If the O_DIRECT write will extend the file then add this inode to the
3051 * orphan list. So recovery will truncate it back to the original size
3052 * if the machine crashes during the write.
3055 static ssize_t
ext4_ext_direct_IO(struct kiocb
*iocb
, struct iov_iter
*iter
,
3058 struct file
*file
= iocb
->ki_filp
;
3059 struct inode
*inode
= file
->f_mapping
->host
;
3061 size_t count
= iov_iter_count(iter
);
3063 get_block_t
*get_block_func
= NULL
;
3065 loff_t final_size
= offset
+ count
;
3066 ext4_io_end_t
*io_end
= NULL
;
3068 /* Use the old path for reads and writes beyond i_size. */
3069 if (iov_iter_rw(iter
) != WRITE
|| final_size
> inode
->i_size
)
3070 return ext4_ind_direct_IO(iocb
, iter
, offset
);
3072 BUG_ON(iocb
->private == NULL
);
3075 * Make all waiters for direct IO properly wait also for extent
3076 * conversion. This also disallows race between truncate() and
3077 * overwrite DIO as i_dio_count needs to be incremented under i_mutex.
3079 if (iov_iter_rw(iter
) == WRITE
)
3080 inode_dio_begin(inode
);
3082 /* If we do a overwrite dio, i_mutex locking can be released */
3083 overwrite
= *((int *)iocb
->private);
3086 down_read(&EXT4_I(inode
)->i_data_sem
);
3087 mutex_unlock(&inode
->i_mutex
);
3091 * We could direct write to holes and fallocate.
3093 * Allocated blocks to fill the hole are marked as
3094 * unwritten to prevent parallel buffered read to expose
3095 * the stale data before DIO complete the data IO.
3097 * As to previously fallocated extents, ext4 get_block will
3098 * just simply mark the buffer mapped but still keep the
3099 * extents unwritten.
3101 * For non AIO case, we will convert those unwritten extents
3102 * to written after return back from blockdev_direct_IO.
3104 * For async DIO, the conversion needs to be deferred when the
3105 * IO is completed. The ext4 end_io callback function will be
3106 * called to take care of the conversion work. Here for async
3107 * case, we allocate an io_end structure to hook to the iocb.
3109 iocb
->private = NULL
;
3110 ext4_inode_aio_set(inode
, NULL
);
3111 if (!is_sync_kiocb(iocb
)) {
3112 io_end
= ext4_init_io_end(inode
, GFP_NOFS
);
3118 * Grab reference for DIO. Will be dropped in ext4_end_io_dio()
3120 iocb
->private = ext4_get_io_end(io_end
);
3122 * we save the io structure for current async direct
3123 * IO, so that later ext4_map_blocks() could flag the
3124 * io structure whether there is a unwritten extents
3125 * needs to be converted when IO is completed.
3127 ext4_inode_aio_set(inode
, io_end
);
3131 get_block_func
= ext4_get_block_write_nolock
;
3133 get_block_func
= ext4_get_block_write
;
3134 dio_flags
= DIO_LOCKING
;
3136 #ifdef CONFIG_EXT4_FS_ENCRYPTION
3137 BUG_ON(ext4_encrypted_inode(inode
) && S_ISREG(inode
->i_mode
));
3140 ret
= dax_do_io(iocb
, inode
, iter
, offset
, get_block_func
,
3141 ext4_end_io_dio
, dio_flags
);
3143 ret
= __blockdev_direct_IO(iocb
, inode
,
3144 inode
->i_sb
->s_bdev
, iter
, offset
,
3146 ext4_end_io_dio
, NULL
, dio_flags
);
3149 * Put our reference to io_end. This can free the io_end structure e.g.
3150 * in sync IO case or in case of error. It can even perform extent
3151 * conversion if all bios we submitted finished before we got here.
3152 * Note that in that case iocb->private can be already set to NULL
3156 ext4_inode_aio_set(inode
, NULL
);
3157 ext4_put_io_end(io_end
);
3159 * When no IO was submitted ext4_end_io_dio() was not
3160 * called so we have to put iocb's reference.
3162 if (ret
<= 0 && ret
!= -EIOCBQUEUED
&& iocb
->private) {
3163 WARN_ON(iocb
->private != io_end
);
3164 WARN_ON(io_end
->flag
& EXT4_IO_END_UNWRITTEN
);
3165 ext4_put_io_end(io_end
);
3166 iocb
->private = NULL
;
3169 if (ret
> 0 && !overwrite
&& ext4_test_inode_state(inode
,
3170 EXT4_STATE_DIO_UNWRITTEN
)) {
3173 * for non AIO case, since the IO is already
3174 * completed, we could do the conversion right here
3176 err
= ext4_convert_unwritten_extents(NULL
, inode
,
3180 ext4_clear_inode_state(inode
, EXT4_STATE_DIO_UNWRITTEN
);
3184 if (iov_iter_rw(iter
) == WRITE
)
3185 inode_dio_end(inode
);
3186 /* take i_mutex locking again if we do a ovewrite dio */
3188 up_read(&EXT4_I(inode
)->i_data_sem
);
3189 mutex_lock(&inode
->i_mutex
);
3195 static ssize_t
ext4_direct_IO(struct kiocb
*iocb
, struct iov_iter
*iter
,
3198 struct file
*file
= iocb
->ki_filp
;
3199 struct inode
*inode
= file
->f_mapping
->host
;
3200 size_t count
= iov_iter_count(iter
);
3203 #ifdef CONFIG_EXT4_FS_ENCRYPTION
3204 if (ext4_encrypted_inode(inode
) && S_ISREG(inode
->i_mode
))
3209 * If we are doing data journalling we don't support O_DIRECT
3211 if (ext4_should_journal_data(inode
))
3214 /* Let buffer I/O handle the inline data case. */
3215 if (ext4_has_inline_data(inode
))
3218 trace_ext4_direct_IO_enter(inode
, offset
, count
, iov_iter_rw(iter
));
3219 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))
3220 ret
= ext4_ext_direct_IO(iocb
, iter
, offset
);
3222 ret
= ext4_ind_direct_IO(iocb
, iter
, offset
);
3223 trace_ext4_direct_IO_exit(inode
, offset
, count
, iov_iter_rw(iter
), ret
);
3228 * Pages can be marked dirty completely asynchronously from ext4's journalling
3229 * activity. By filemap_sync_pte(), try_to_unmap_one(), etc. We cannot do
3230 * much here because ->set_page_dirty is called under VFS locks. The page is
3231 * not necessarily locked.
3233 * We cannot just dirty the page and leave attached buffers clean, because the
3234 * buffers' dirty state is "definitive". We cannot just set the buffers dirty
3235 * or jbddirty because all the journalling code will explode.
3237 * So what we do is to mark the page "pending dirty" and next time writepage
3238 * is called, propagate that into the buffers appropriately.
3240 static int ext4_journalled_set_page_dirty(struct page
*page
)
3242 SetPageChecked(page
);
3243 return __set_page_dirty_nobuffers(page
);
3246 static const struct address_space_operations ext4_aops
= {
3247 .readpage
= ext4_readpage
,
3248 .readpages
= ext4_readpages
,
3249 .writepage
= ext4_writepage
,
3250 .writepages
= ext4_writepages
,
3251 .write_begin
= ext4_write_begin
,
3252 .write_end
= ext4_write_end
,
3254 .invalidatepage
= ext4_invalidatepage
,
3255 .releasepage
= ext4_releasepage
,
3256 .direct_IO
= ext4_direct_IO
,
3257 .migratepage
= buffer_migrate_page
,
3258 .is_partially_uptodate
= block_is_partially_uptodate
,
3259 .error_remove_page
= generic_error_remove_page
,
3262 static const struct address_space_operations ext4_journalled_aops
= {
3263 .readpage
= ext4_readpage
,
3264 .readpages
= ext4_readpages
,
3265 .writepage
= ext4_writepage
,
3266 .writepages
= ext4_writepages
,
3267 .write_begin
= ext4_write_begin
,
3268 .write_end
= ext4_journalled_write_end
,
3269 .set_page_dirty
= ext4_journalled_set_page_dirty
,
3271 .invalidatepage
= ext4_journalled_invalidatepage
,
3272 .releasepage
= ext4_releasepage
,
3273 .direct_IO
= ext4_direct_IO
,
3274 .is_partially_uptodate
= block_is_partially_uptodate
,
3275 .error_remove_page
= generic_error_remove_page
,
3278 static const struct address_space_operations ext4_da_aops
= {
3279 .readpage
= ext4_readpage
,
3280 .readpages
= ext4_readpages
,
3281 .writepage
= ext4_writepage
,
3282 .writepages
= ext4_writepages
,
3283 .write_begin
= ext4_da_write_begin
,
3284 .write_end
= ext4_da_write_end
,
3286 .invalidatepage
= ext4_da_invalidatepage
,
3287 .releasepage
= ext4_releasepage
,
3288 .direct_IO
= ext4_direct_IO
,
3289 .migratepage
= buffer_migrate_page
,
3290 .is_partially_uptodate
= block_is_partially_uptodate
,
3291 .error_remove_page
= generic_error_remove_page
,
3294 void ext4_set_aops(struct inode
*inode
)
3296 switch (ext4_inode_journal_mode(inode
)) {
3297 case EXT4_INODE_ORDERED_DATA_MODE
:
3298 ext4_set_inode_state(inode
, EXT4_STATE_ORDERED_MODE
);
3300 case EXT4_INODE_WRITEBACK_DATA_MODE
:
3301 ext4_clear_inode_state(inode
, EXT4_STATE_ORDERED_MODE
);
3303 case EXT4_INODE_JOURNAL_DATA_MODE
:
3304 inode
->i_mapping
->a_ops
= &ext4_journalled_aops
;
3309 if (test_opt(inode
->i_sb
, DELALLOC
))
3310 inode
->i_mapping
->a_ops
= &ext4_da_aops
;
3312 inode
->i_mapping
->a_ops
= &ext4_aops
;
3315 static int __ext4_block_zero_page_range(handle_t
*handle
,
3316 struct address_space
*mapping
, loff_t from
, loff_t length
)
3318 ext4_fsblk_t index
= from
>> PAGE_CACHE_SHIFT
;
3319 unsigned offset
= from
& (PAGE_CACHE_SIZE
-1);
3320 unsigned blocksize
, pos
;
3322 struct inode
*inode
= mapping
->host
;
3323 struct buffer_head
*bh
;
3327 page
= find_or_create_page(mapping
, from
>> PAGE_CACHE_SHIFT
,
3328 mapping_gfp_mask(mapping
) & ~__GFP_FS
);
3332 blocksize
= inode
->i_sb
->s_blocksize
;
3334 iblock
= index
<< (PAGE_CACHE_SHIFT
- inode
->i_sb
->s_blocksize_bits
);
3336 if (!page_has_buffers(page
))
3337 create_empty_buffers(page
, blocksize
, 0);
3339 /* Find the buffer that contains "offset" */
3340 bh
= page_buffers(page
);
3342 while (offset
>= pos
) {
3343 bh
= bh
->b_this_page
;
3347 if (buffer_freed(bh
)) {
3348 BUFFER_TRACE(bh
, "freed: skip");
3351 if (!buffer_mapped(bh
)) {
3352 BUFFER_TRACE(bh
, "unmapped");
3353 ext4_get_block(inode
, iblock
, bh
, 0);
3354 /* unmapped? It's a hole - nothing to do */
3355 if (!buffer_mapped(bh
)) {
3356 BUFFER_TRACE(bh
, "still unmapped");
3361 /* Ok, it's mapped. Make sure it's up-to-date */
3362 if (PageUptodate(page
))
3363 set_buffer_uptodate(bh
);
3365 if (!buffer_uptodate(bh
)) {
3367 ll_rw_block(READ
, 1, &bh
);
3369 /* Uhhuh. Read error. Complain and punt. */
3370 if (!buffer_uptodate(bh
))
3372 if (S_ISREG(inode
->i_mode
) &&
3373 ext4_encrypted_inode(inode
)) {
3374 /* We expect the key to be set. */
3375 BUG_ON(!ext4_has_encryption_key(inode
));
3376 BUG_ON(blocksize
!= PAGE_CACHE_SIZE
);
3377 WARN_ON_ONCE(ext4_decrypt_one(inode
, page
));
3380 if (ext4_should_journal_data(inode
)) {
3381 BUFFER_TRACE(bh
, "get write access");
3382 err
= ext4_journal_get_write_access(handle
, bh
);
3386 zero_user(page
, offset
, length
);
3387 BUFFER_TRACE(bh
, "zeroed end of block");
3389 if (ext4_should_journal_data(inode
)) {
3390 err
= ext4_handle_dirty_metadata(handle
, inode
, bh
);
3393 mark_buffer_dirty(bh
);
3394 if (ext4_test_inode_state(inode
, EXT4_STATE_ORDERED_MODE
))
3395 err
= ext4_jbd2_file_inode(handle
, inode
);
3400 page_cache_release(page
);
3405 * ext4_block_zero_page_range() zeros out a mapping of length 'length'
3406 * starting from file offset 'from'. The range to be zero'd must
3407 * be contained with in one block. If the specified range exceeds
3408 * the end of the block it will be shortened to end of the block
3409 * that cooresponds to 'from'
3411 static int ext4_block_zero_page_range(handle_t
*handle
,
3412 struct address_space
*mapping
, loff_t from
, loff_t length
)
3414 struct inode
*inode
= mapping
->host
;
3415 unsigned offset
= from
& (PAGE_CACHE_SIZE
-1);
3416 unsigned blocksize
= inode
->i_sb
->s_blocksize
;
3417 unsigned max
= blocksize
- (offset
& (blocksize
- 1));
3420 * correct length if it does not fall between
3421 * 'from' and the end of the block
3423 if (length
> max
|| length
< 0)
3427 return dax_zero_page_range(inode
, from
, length
, ext4_get_block
);
3428 return __ext4_block_zero_page_range(handle
, mapping
, from
, length
);
3432 * ext4_block_truncate_page() zeroes out a mapping from file offset `from'
3433 * up to the end of the block which corresponds to `from'.
3434 * This required during truncate. We need to physically zero the tail end
3435 * of that block so it doesn't yield old data if the file is later grown.
3437 static int ext4_block_truncate_page(handle_t
*handle
,
3438 struct address_space
*mapping
, loff_t from
)
3440 unsigned offset
= from
& (PAGE_CACHE_SIZE
-1);
3443 struct inode
*inode
= mapping
->host
;
3445 blocksize
= inode
->i_sb
->s_blocksize
;
3446 length
= blocksize
- (offset
& (blocksize
- 1));
3448 return ext4_block_zero_page_range(handle
, mapping
, from
, length
);
3451 int ext4_zero_partial_blocks(handle_t
*handle
, struct inode
*inode
,
3452 loff_t lstart
, loff_t length
)
3454 struct super_block
*sb
= inode
->i_sb
;
3455 struct address_space
*mapping
= inode
->i_mapping
;
3456 unsigned partial_start
, partial_end
;
3457 ext4_fsblk_t start
, end
;
3458 loff_t byte_end
= (lstart
+ length
- 1);
3461 partial_start
= lstart
& (sb
->s_blocksize
- 1);
3462 partial_end
= byte_end
& (sb
->s_blocksize
- 1);
3464 start
= lstart
>> sb
->s_blocksize_bits
;
3465 end
= byte_end
>> sb
->s_blocksize_bits
;
3467 /* Handle partial zero within the single block */
3469 (partial_start
|| (partial_end
!= sb
->s_blocksize
- 1))) {
3470 err
= ext4_block_zero_page_range(handle
, mapping
,
3474 /* Handle partial zero out on the start of the range */
3475 if (partial_start
) {
3476 err
= ext4_block_zero_page_range(handle
, mapping
,
3477 lstart
, sb
->s_blocksize
);
3481 /* Handle partial zero out on the end of the range */
3482 if (partial_end
!= sb
->s_blocksize
- 1)
3483 err
= ext4_block_zero_page_range(handle
, mapping
,
3484 byte_end
- partial_end
,
3489 int ext4_can_truncate(struct inode
*inode
)
3491 if (S_ISREG(inode
->i_mode
))
3493 if (S_ISDIR(inode
->i_mode
))
3495 if (S_ISLNK(inode
->i_mode
))
3496 return !ext4_inode_is_fast_symlink(inode
);
3501 * ext4_punch_hole: punches a hole in a file by releaseing the blocks
3502 * associated with the given offset and length
3504 * @inode: File inode
3505 * @offset: The offset where the hole will begin
3506 * @len: The length of the hole
3508 * Returns: 0 on success or negative on failure
3511 int ext4_punch_hole(struct inode
*inode
, loff_t offset
, loff_t length
)
3513 struct super_block
*sb
= inode
->i_sb
;
3514 ext4_lblk_t first_block
, stop_block
;
3515 struct address_space
*mapping
= inode
->i_mapping
;
3516 loff_t first_block_offset
, last_block_offset
;
3518 unsigned int credits
;
3521 if (!S_ISREG(inode
->i_mode
))
3524 trace_ext4_punch_hole(inode
, offset
, length
, 0);
3527 * Write out all dirty pages to avoid race conditions
3528 * Then release them.
3530 if (mapping
->nrpages
&& mapping_tagged(mapping
, PAGECACHE_TAG_DIRTY
)) {
3531 ret
= filemap_write_and_wait_range(mapping
, offset
,
3532 offset
+ length
- 1);
3537 mutex_lock(&inode
->i_mutex
);
3539 /* No need to punch hole beyond i_size */
3540 if (offset
>= inode
->i_size
)
3544 * If the hole extends beyond i_size, set the hole
3545 * to end after the page that contains i_size
3547 if (offset
+ length
> inode
->i_size
) {
3548 length
= inode
->i_size
+
3549 PAGE_CACHE_SIZE
- (inode
->i_size
& (PAGE_CACHE_SIZE
- 1)) -
3553 if (offset
& (sb
->s_blocksize
- 1) ||
3554 (offset
+ length
) & (sb
->s_blocksize
- 1)) {
3556 * Attach jinode to inode for jbd2 if we do any zeroing of
3559 ret
= ext4_inode_attach_jinode(inode
);
3565 first_block_offset
= round_up(offset
, sb
->s_blocksize
);
3566 last_block_offset
= round_down((offset
+ length
), sb
->s_blocksize
) - 1;
3568 /* Now release the pages and zero block aligned part of pages*/
3569 if (last_block_offset
> first_block_offset
)
3570 truncate_pagecache_range(inode
, first_block_offset
,
3573 /* Wait all existing dio workers, newcomers will block on i_mutex */
3574 ext4_inode_block_unlocked_dio(inode
);
3575 inode_dio_wait(inode
);
3577 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))
3578 credits
= ext4_writepage_trans_blocks(inode
);
3580 credits
= ext4_blocks_for_truncate(inode
);
3581 handle
= ext4_journal_start(inode
, EXT4_HT_TRUNCATE
, credits
);
3582 if (IS_ERR(handle
)) {
3583 ret
= PTR_ERR(handle
);
3584 ext4_std_error(sb
, ret
);
3588 ret
= ext4_zero_partial_blocks(handle
, inode
, offset
,
3593 first_block
= (offset
+ sb
->s_blocksize
- 1) >>
3594 EXT4_BLOCK_SIZE_BITS(sb
);
3595 stop_block
= (offset
+ length
) >> EXT4_BLOCK_SIZE_BITS(sb
);
3597 /* If there are no blocks to remove, return now */
3598 if (first_block
>= stop_block
)
3601 down_write(&EXT4_I(inode
)->i_data_sem
);
3602 ext4_discard_preallocations(inode
);
3604 ret
= ext4_es_remove_extent(inode
, first_block
,
3605 stop_block
- first_block
);
3607 up_write(&EXT4_I(inode
)->i_data_sem
);
3611 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))
3612 ret
= ext4_ext_remove_space(inode
, first_block
,
3615 ret
= ext4_ind_remove_space(handle
, inode
, first_block
,
3618 up_write(&EXT4_I(inode
)->i_data_sem
);
3620 ext4_handle_sync(handle
);
3622 /* Now release the pages again to reduce race window */
3623 if (last_block_offset
> first_block_offset
)
3624 truncate_pagecache_range(inode
, first_block_offset
,
3627 inode
->i_mtime
= inode
->i_ctime
= ext4_current_time(inode
);
3628 ext4_mark_inode_dirty(handle
, inode
);
3630 ext4_journal_stop(handle
);
3632 ext4_inode_resume_unlocked_dio(inode
);
3634 mutex_unlock(&inode
->i_mutex
);
3638 int ext4_inode_attach_jinode(struct inode
*inode
)
3640 struct ext4_inode_info
*ei
= EXT4_I(inode
);
3641 struct jbd2_inode
*jinode
;
3643 if (ei
->jinode
|| !EXT4_SB(inode
->i_sb
)->s_journal
)
3646 jinode
= jbd2_alloc_inode(GFP_KERNEL
);
3647 spin_lock(&inode
->i_lock
);
3650 spin_unlock(&inode
->i_lock
);
3653 ei
->jinode
= jinode
;
3654 jbd2_journal_init_jbd_inode(ei
->jinode
, inode
);
3657 spin_unlock(&inode
->i_lock
);
3658 if (unlikely(jinode
!= NULL
))
3659 jbd2_free_inode(jinode
);
3666 * We block out ext4_get_block() block instantiations across the entire
3667 * transaction, and VFS/VM ensures that ext4_truncate() cannot run
3668 * simultaneously on behalf of the same inode.
3670 * As we work through the truncate and commit bits of it to the journal there
3671 * is one core, guiding principle: the file's tree must always be consistent on
3672 * disk. We must be able to restart the truncate after a crash.
3674 * The file's tree may be transiently inconsistent in memory (although it
3675 * probably isn't), but whenever we close off and commit a journal transaction,
3676 * the contents of (the filesystem + the journal) must be consistent and
3677 * restartable. It's pretty simple, really: bottom up, right to left (although
3678 * left-to-right works OK too).
3680 * Note that at recovery time, journal replay occurs *before* the restart of
3681 * truncate against the orphan inode list.
3683 * The committed inode has the new, desired i_size (which is the same as
3684 * i_disksize in this case). After a crash, ext4_orphan_cleanup() will see
3685 * that this inode's truncate did not complete and it will again call
3686 * ext4_truncate() to have another go. So there will be instantiated blocks
3687 * to the right of the truncation point in a crashed ext4 filesystem. But
3688 * that's fine - as long as they are linked from the inode, the post-crash
3689 * ext4_truncate() run will find them and release them.
3691 void ext4_truncate(struct inode
*inode
)
3693 struct ext4_inode_info
*ei
= EXT4_I(inode
);
3694 unsigned int credits
;
3696 struct address_space
*mapping
= inode
->i_mapping
;
3699 * There is a possibility that we're either freeing the inode
3700 * or it's a completely new inode. In those cases we might not
3701 * have i_mutex locked because it's not necessary.
3703 if (!(inode
->i_state
& (I_NEW
|I_FREEING
)))
3704 WARN_ON(!mutex_is_locked(&inode
->i_mutex
));
3705 trace_ext4_truncate_enter(inode
);
3707 if (!ext4_can_truncate(inode
))
3710 ext4_clear_inode_flag(inode
, EXT4_INODE_EOFBLOCKS
);
3712 if (inode
->i_size
== 0 && !test_opt(inode
->i_sb
, NO_AUTO_DA_ALLOC
))
3713 ext4_set_inode_state(inode
, EXT4_STATE_DA_ALLOC_CLOSE
);
3715 if (ext4_has_inline_data(inode
)) {
3718 ext4_inline_data_truncate(inode
, &has_inline
);
3723 /* If we zero-out tail of the page, we have to create jinode for jbd2 */
3724 if (inode
->i_size
& (inode
->i_sb
->s_blocksize
- 1)) {
3725 if (ext4_inode_attach_jinode(inode
) < 0)
3729 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))
3730 credits
= ext4_writepage_trans_blocks(inode
);
3732 credits
= ext4_blocks_for_truncate(inode
);
3734 handle
= ext4_journal_start(inode
, EXT4_HT_TRUNCATE
, credits
);
3735 if (IS_ERR(handle
)) {
3736 ext4_std_error(inode
->i_sb
, PTR_ERR(handle
));
3740 if (inode
->i_size
& (inode
->i_sb
->s_blocksize
- 1))
3741 ext4_block_truncate_page(handle
, mapping
, inode
->i_size
);
3744 * We add the inode to the orphan list, so that if this
3745 * truncate spans multiple transactions, and we crash, we will
3746 * resume the truncate when the filesystem recovers. It also
3747 * marks the inode dirty, to catch the new size.
3749 * Implication: the file must always be in a sane, consistent
3750 * truncatable state while each transaction commits.
3752 if (ext4_orphan_add(handle
, inode
))
3755 down_write(&EXT4_I(inode
)->i_data_sem
);
3757 ext4_discard_preallocations(inode
);
3759 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))
3760 ext4_ext_truncate(handle
, inode
);
3762 ext4_ind_truncate(handle
, inode
);
3764 up_write(&ei
->i_data_sem
);
3767 ext4_handle_sync(handle
);
3771 * If this was a simple ftruncate() and the file will remain alive,
3772 * then we need to clear up the orphan record which we created above.
3773 * However, if this was a real unlink then we were called by
3774 * ext4_evict_inode(), and we allow that function to clean up the
3775 * orphan info for us.
3778 ext4_orphan_del(handle
, inode
);
3780 inode
->i_mtime
= inode
->i_ctime
= ext4_current_time(inode
);
3781 ext4_mark_inode_dirty(handle
, inode
);
3782 ext4_journal_stop(handle
);
3784 trace_ext4_truncate_exit(inode
);
3788 * ext4_get_inode_loc returns with an extra refcount against the inode's
3789 * underlying buffer_head on success. If 'in_mem' is true, we have all
3790 * data in memory that is needed to recreate the on-disk version of this
3793 static int __ext4_get_inode_loc(struct inode
*inode
,
3794 struct ext4_iloc
*iloc
, int in_mem
)
3796 struct ext4_group_desc
*gdp
;
3797 struct buffer_head
*bh
;
3798 struct super_block
*sb
= inode
->i_sb
;
3800 int inodes_per_block
, inode_offset
;
3803 if (!ext4_valid_inum(sb
, inode
->i_ino
))
3806 iloc
->block_group
= (inode
->i_ino
- 1) / EXT4_INODES_PER_GROUP(sb
);
3807 gdp
= ext4_get_group_desc(sb
, iloc
->block_group
, NULL
);
3812 * Figure out the offset within the block group inode table
3814 inodes_per_block
= EXT4_SB(sb
)->s_inodes_per_block
;
3815 inode_offset
= ((inode
->i_ino
- 1) %
3816 EXT4_INODES_PER_GROUP(sb
));
3817 block
= ext4_inode_table(sb
, gdp
) + (inode_offset
/ inodes_per_block
);
3818 iloc
->offset
= (inode_offset
% inodes_per_block
) * EXT4_INODE_SIZE(sb
);
3820 bh
= sb_getblk(sb
, block
);
3823 if (!buffer_uptodate(bh
)) {
3827 * If the buffer has the write error flag, we have failed
3828 * to write out another inode in the same block. In this
3829 * case, we don't have to read the block because we may
3830 * read the old inode data successfully.
3832 if (buffer_write_io_error(bh
) && !buffer_uptodate(bh
))
3833 set_buffer_uptodate(bh
);
3835 if (buffer_uptodate(bh
)) {
3836 /* someone brought it uptodate while we waited */
3842 * If we have all information of the inode in memory and this
3843 * is the only valid inode in the block, we need not read the
3847 struct buffer_head
*bitmap_bh
;
3850 start
= inode_offset
& ~(inodes_per_block
- 1);
3852 /* Is the inode bitmap in cache? */
3853 bitmap_bh
= sb_getblk(sb
, ext4_inode_bitmap(sb
, gdp
));
3854 if (unlikely(!bitmap_bh
))
3858 * If the inode bitmap isn't in cache then the
3859 * optimisation may end up performing two reads instead
3860 * of one, so skip it.
3862 if (!buffer_uptodate(bitmap_bh
)) {
3866 for (i
= start
; i
< start
+ inodes_per_block
; i
++) {
3867 if (i
== inode_offset
)
3869 if (ext4_test_bit(i
, bitmap_bh
->b_data
))
3873 if (i
== start
+ inodes_per_block
) {
3874 /* all other inodes are free, so skip I/O */
3875 memset(bh
->b_data
, 0, bh
->b_size
);
3876 set_buffer_uptodate(bh
);
3884 * If we need to do any I/O, try to pre-readahead extra
3885 * blocks from the inode table.
3887 if (EXT4_SB(sb
)->s_inode_readahead_blks
) {
3888 ext4_fsblk_t b
, end
, table
;
3890 __u32 ra_blks
= EXT4_SB(sb
)->s_inode_readahead_blks
;
3892 table
= ext4_inode_table(sb
, gdp
);
3893 /* s_inode_readahead_blks is always a power of 2 */
3894 b
= block
& ~((ext4_fsblk_t
) ra_blks
- 1);
3898 num
= EXT4_INODES_PER_GROUP(sb
);
3899 if (ext4_has_group_desc_csum(sb
))
3900 num
-= ext4_itable_unused_count(sb
, gdp
);
3901 table
+= num
/ inodes_per_block
;
3905 sb_breadahead(sb
, b
++);
3909 * There are other valid inodes in the buffer, this inode
3910 * has in-inode xattrs, or we don't have this inode in memory.
3911 * Read the block from disk.
3913 trace_ext4_load_inode(inode
);
3915 bh
->b_end_io
= end_buffer_read_sync
;
3916 submit_bh(READ
| REQ_META
| REQ_PRIO
, bh
);
3918 if (!buffer_uptodate(bh
)) {
3919 EXT4_ERROR_INODE_BLOCK(inode
, block
,
3920 "unable to read itable block");
3930 int ext4_get_inode_loc(struct inode
*inode
, struct ext4_iloc
*iloc
)
3932 /* We have all inode data except xattrs in memory here. */
3933 return __ext4_get_inode_loc(inode
, iloc
,
3934 !ext4_test_inode_state(inode
, EXT4_STATE_XATTR
));
3937 void ext4_set_inode_flags(struct inode
*inode
)
3939 unsigned int flags
= EXT4_I(inode
)->i_flags
;
3940 unsigned int new_fl
= 0;
3942 if (flags
& EXT4_SYNC_FL
)
3944 if (flags
& EXT4_APPEND_FL
)
3946 if (flags
& EXT4_IMMUTABLE_FL
)
3947 new_fl
|= S_IMMUTABLE
;
3948 if (flags
& EXT4_NOATIME_FL
)
3949 new_fl
|= S_NOATIME
;
3950 if (flags
& EXT4_DIRSYNC_FL
)
3951 new_fl
|= S_DIRSYNC
;
3952 if (test_opt(inode
->i_sb
, DAX
))
3954 inode_set_flags(inode
, new_fl
,
3955 S_SYNC
|S_APPEND
|S_IMMUTABLE
|S_NOATIME
|S_DIRSYNC
|S_DAX
);
3958 /* Propagate flags from i_flags to EXT4_I(inode)->i_flags */
3959 void ext4_get_inode_flags(struct ext4_inode_info
*ei
)
3961 unsigned int vfs_fl
;
3962 unsigned long old_fl
, new_fl
;
3965 vfs_fl
= ei
->vfs_inode
.i_flags
;
3966 old_fl
= ei
->i_flags
;
3967 new_fl
= old_fl
& ~(EXT4_SYNC_FL
|EXT4_APPEND_FL
|
3968 EXT4_IMMUTABLE_FL
|EXT4_NOATIME_FL
|
3970 if (vfs_fl
& S_SYNC
)
3971 new_fl
|= EXT4_SYNC_FL
;
3972 if (vfs_fl
& S_APPEND
)
3973 new_fl
|= EXT4_APPEND_FL
;
3974 if (vfs_fl
& S_IMMUTABLE
)
3975 new_fl
|= EXT4_IMMUTABLE_FL
;
3976 if (vfs_fl
& S_NOATIME
)
3977 new_fl
|= EXT4_NOATIME_FL
;
3978 if (vfs_fl
& S_DIRSYNC
)
3979 new_fl
|= EXT4_DIRSYNC_FL
;
3980 } while (cmpxchg(&ei
->i_flags
, old_fl
, new_fl
) != old_fl
);
3983 static blkcnt_t
ext4_inode_blocks(struct ext4_inode
*raw_inode
,
3984 struct ext4_inode_info
*ei
)
3987 struct inode
*inode
= &(ei
->vfs_inode
);
3988 struct super_block
*sb
= inode
->i_sb
;
3990 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3991 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
3992 /* we are using combined 48 bit field */
3993 i_blocks
= ((u64
)le16_to_cpu(raw_inode
->i_blocks_high
)) << 32 |
3994 le32_to_cpu(raw_inode
->i_blocks_lo
);
3995 if (ext4_test_inode_flag(inode
, EXT4_INODE_HUGE_FILE
)) {
3996 /* i_blocks represent file system block size */
3997 return i_blocks
<< (inode
->i_blkbits
- 9);
4002 return le32_to_cpu(raw_inode
->i_blocks_lo
);
4006 static inline void ext4_iget_extra_inode(struct inode
*inode
,
4007 struct ext4_inode
*raw_inode
,
4008 struct ext4_inode_info
*ei
)
4010 __le32
*magic
= (void *)raw_inode
+
4011 EXT4_GOOD_OLD_INODE_SIZE
+ ei
->i_extra_isize
;
4012 if (*magic
== cpu_to_le32(EXT4_XATTR_MAGIC
)) {
4013 ext4_set_inode_state(inode
, EXT4_STATE_XATTR
);
4014 ext4_find_inline_data_nolock(inode
);
4016 EXT4_I(inode
)->i_inline_off
= 0;
4019 struct inode
*ext4_iget(struct super_block
*sb
, unsigned long ino
)
4021 struct ext4_iloc iloc
;
4022 struct ext4_inode
*raw_inode
;
4023 struct ext4_inode_info
*ei
;
4024 struct inode
*inode
;
4025 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
4031 inode
= iget_locked(sb
, ino
);
4033 return ERR_PTR(-ENOMEM
);
4034 if (!(inode
->i_state
& I_NEW
))
4040 ret
= __ext4_get_inode_loc(inode
, &iloc
, 0);
4043 raw_inode
= ext4_raw_inode(&iloc
);
4045 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
) {
4046 ei
->i_extra_isize
= le16_to_cpu(raw_inode
->i_extra_isize
);
4047 if (EXT4_GOOD_OLD_INODE_SIZE
+ ei
->i_extra_isize
>
4048 EXT4_INODE_SIZE(inode
->i_sb
)) {
4049 EXT4_ERROR_INODE(inode
, "bad extra_isize (%u != %u)",
4050 EXT4_GOOD_OLD_INODE_SIZE
+ ei
->i_extra_isize
,
4051 EXT4_INODE_SIZE(inode
->i_sb
));
4056 ei
->i_extra_isize
= 0;
4058 /* Precompute checksum seed for inode metadata */
4059 if (ext4_has_metadata_csum(sb
)) {
4060 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
4062 __le32 inum
= cpu_to_le32(inode
->i_ino
);
4063 __le32 gen
= raw_inode
->i_generation
;
4064 csum
= ext4_chksum(sbi
, sbi
->s_csum_seed
, (__u8
*)&inum
,
4066 ei
->i_csum_seed
= ext4_chksum(sbi
, csum
, (__u8
*)&gen
,
4070 if (!ext4_inode_csum_verify(inode
, raw_inode
, ei
)) {
4071 EXT4_ERROR_INODE(inode
, "checksum invalid");
4076 inode
->i_mode
= le16_to_cpu(raw_inode
->i_mode
);
4077 i_uid
= (uid_t
)le16_to_cpu(raw_inode
->i_uid_low
);
4078 i_gid
= (gid_t
)le16_to_cpu(raw_inode
->i_gid_low
);
4079 if (!(test_opt(inode
->i_sb
, NO_UID32
))) {
4080 i_uid
|= le16_to_cpu(raw_inode
->i_uid_high
) << 16;
4081 i_gid
|= le16_to_cpu(raw_inode
->i_gid_high
) << 16;
4083 i_uid_write(inode
, i_uid
);
4084 i_gid_write(inode
, i_gid
);
4085 set_nlink(inode
, le16_to_cpu(raw_inode
->i_links_count
));
4087 ext4_clear_state_flags(ei
); /* Only relevant on 32-bit archs */
4088 ei
->i_inline_off
= 0;
4089 ei
->i_dir_start_lookup
= 0;
4090 ei
->i_dtime
= le32_to_cpu(raw_inode
->i_dtime
);
4091 /* We now have enough fields to check if the inode was active or not.
4092 * This is needed because nfsd might try to access dead inodes
4093 * the test is that same one that e2fsck uses
4094 * NeilBrown 1999oct15
4096 if (inode
->i_nlink
== 0) {
4097 if ((inode
->i_mode
== 0 ||
4098 !(EXT4_SB(inode
->i_sb
)->s_mount_state
& EXT4_ORPHAN_FS
)) &&
4099 ino
!= EXT4_BOOT_LOADER_INO
) {
4100 /* this inode is deleted */
4104 /* The only unlinked inodes we let through here have
4105 * valid i_mode and are being read by the orphan
4106 * recovery code: that's fine, we're about to complete
4107 * the process of deleting those.
4108 * OR it is the EXT4_BOOT_LOADER_INO which is
4109 * not initialized on a new filesystem. */
4111 ei
->i_flags
= le32_to_cpu(raw_inode
->i_flags
);
4112 inode
->i_blocks
= ext4_inode_blocks(raw_inode
, ei
);
4113 ei
->i_file_acl
= le32_to_cpu(raw_inode
->i_file_acl_lo
);
4114 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
))
4116 ((__u64
)le16_to_cpu(raw_inode
->i_file_acl_high
)) << 32;
4117 inode
->i_size
= ext4_isize(raw_inode
);
4118 ei
->i_disksize
= inode
->i_size
;
4120 ei
->i_reserved_quota
= 0;
4122 inode
->i_generation
= le32_to_cpu(raw_inode
->i_generation
);
4123 ei
->i_block_group
= iloc
.block_group
;
4124 ei
->i_last_alloc_group
= ~0;
4126 * NOTE! The in-memory inode i_data array is in little-endian order
4127 * even on big-endian machines: we do NOT byteswap the block numbers!
4129 for (block
= 0; block
< EXT4_N_BLOCKS
; block
++)
4130 ei
->i_data
[block
] = raw_inode
->i_block
[block
];
4131 INIT_LIST_HEAD(&ei
->i_orphan
);
4134 * Set transaction id's of transactions that have to be committed
4135 * to finish f[data]sync. We set them to currently running transaction
4136 * as we cannot be sure that the inode or some of its metadata isn't
4137 * part of the transaction - the inode could have been reclaimed and
4138 * now it is reread from disk.
4141 transaction_t
*transaction
;
4144 read_lock(&journal
->j_state_lock
);
4145 if (journal
->j_running_transaction
)
4146 transaction
= journal
->j_running_transaction
;
4148 transaction
= journal
->j_committing_transaction
;
4150 tid
= transaction
->t_tid
;
4152 tid
= journal
->j_commit_sequence
;
4153 read_unlock(&journal
->j_state_lock
);
4154 ei
->i_sync_tid
= tid
;
4155 ei
->i_datasync_tid
= tid
;
4158 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
) {
4159 if (ei
->i_extra_isize
== 0) {
4160 /* The extra space is currently unused. Use it. */
4161 ei
->i_extra_isize
= sizeof(struct ext4_inode
) -
4162 EXT4_GOOD_OLD_INODE_SIZE
;
4164 ext4_iget_extra_inode(inode
, raw_inode
, ei
);
4168 EXT4_INODE_GET_XTIME(i_ctime
, inode
, raw_inode
);
4169 EXT4_INODE_GET_XTIME(i_mtime
, inode
, raw_inode
);
4170 EXT4_INODE_GET_XTIME(i_atime
, inode
, raw_inode
);
4171 EXT4_EINODE_GET_XTIME(i_crtime
, ei
, raw_inode
);
4173 if (likely(!test_opt2(inode
->i_sb
, HURD_COMPAT
))) {
4174 inode
->i_version
= le32_to_cpu(raw_inode
->i_disk_version
);
4175 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
) {
4176 if (EXT4_FITS_IN_INODE(raw_inode
, ei
, i_version_hi
))
4178 (__u64
)(le32_to_cpu(raw_inode
->i_version_hi
)) << 32;
4183 if (ei
->i_file_acl
&&
4184 !ext4_data_block_valid(EXT4_SB(sb
), ei
->i_file_acl
, 1)) {
4185 EXT4_ERROR_INODE(inode
, "bad extended attribute block %llu",
4189 } else if (!ext4_has_inline_data(inode
)) {
4190 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)) {
4191 if ((S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
4192 (S_ISLNK(inode
->i_mode
) &&
4193 !ext4_inode_is_fast_symlink(inode
))))
4194 /* Validate extent which is part of inode */
4195 ret
= ext4_ext_check_inode(inode
);
4196 } else if (S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
4197 (S_ISLNK(inode
->i_mode
) &&
4198 !ext4_inode_is_fast_symlink(inode
))) {
4199 /* Validate block references which are part of inode */
4200 ret
= ext4_ind_check_inode(inode
);
4206 if (S_ISREG(inode
->i_mode
)) {
4207 inode
->i_op
= &ext4_file_inode_operations
;
4208 inode
->i_fop
= &ext4_file_operations
;
4209 ext4_set_aops(inode
);
4210 } else if (S_ISDIR(inode
->i_mode
)) {
4211 inode
->i_op
= &ext4_dir_inode_operations
;
4212 inode
->i_fop
= &ext4_dir_operations
;
4213 } else if (S_ISLNK(inode
->i_mode
)) {
4214 if (ext4_inode_is_fast_symlink(inode
) &&
4215 !ext4_encrypted_inode(inode
)) {
4216 inode
->i_op
= &ext4_fast_symlink_inode_operations
;
4217 nd_terminate_link(ei
->i_data
, inode
->i_size
,
4218 sizeof(ei
->i_data
) - 1);
4220 inode
->i_op
= &ext4_symlink_inode_operations
;
4221 ext4_set_aops(inode
);
4223 } else if (S_ISCHR(inode
->i_mode
) || S_ISBLK(inode
->i_mode
) ||
4224 S_ISFIFO(inode
->i_mode
) || S_ISSOCK(inode
->i_mode
)) {
4225 inode
->i_op
= &ext4_special_inode_operations
;
4226 if (raw_inode
->i_block
[0])
4227 init_special_inode(inode
, inode
->i_mode
,
4228 old_decode_dev(le32_to_cpu(raw_inode
->i_block
[0])));
4230 init_special_inode(inode
, inode
->i_mode
,
4231 new_decode_dev(le32_to_cpu(raw_inode
->i_block
[1])));
4232 } else if (ino
== EXT4_BOOT_LOADER_INO
) {
4233 make_bad_inode(inode
);
4236 EXT4_ERROR_INODE(inode
, "bogus i_mode (%o)", inode
->i_mode
);
4240 ext4_set_inode_flags(inode
);
4241 unlock_new_inode(inode
);
4247 return ERR_PTR(ret
);
4250 struct inode
*ext4_iget_normal(struct super_block
*sb
, unsigned long ino
)
4252 if (ino
< EXT4_FIRST_INO(sb
) && ino
!= EXT4_ROOT_INO
)
4253 return ERR_PTR(-EIO
);
4254 return ext4_iget(sb
, ino
);
4257 static int ext4_inode_blocks_set(handle_t
*handle
,
4258 struct ext4_inode
*raw_inode
,
4259 struct ext4_inode_info
*ei
)
4261 struct inode
*inode
= &(ei
->vfs_inode
);
4262 u64 i_blocks
= inode
->i_blocks
;
4263 struct super_block
*sb
= inode
->i_sb
;
4265 if (i_blocks
<= ~0U) {
4267 * i_blocks can be represented in a 32 bit variable
4268 * as multiple of 512 bytes
4270 raw_inode
->i_blocks_lo
= cpu_to_le32(i_blocks
);
4271 raw_inode
->i_blocks_high
= 0;
4272 ext4_clear_inode_flag(inode
, EXT4_INODE_HUGE_FILE
);
4275 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
))
4278 if (i_blocks
<= 0xffffffffffffULL
) {
4280 * i_blocks can be represented in a 48 bit variable
4281 * as multiple of 512 bytes
4283 raw_inode
->i_blocks_lo
= cpu_to_le32(i_blocks
);
4284 raw_inode
->i_blocks_high
= cpu_to_le16(i_blocks
>> 32);
4285 ext4_clear_inode_flag(inode
, EXT4_INODE_HUGE_FILE
);
4287 ext4_set_inode_flag(inode
, EXT4_INODE_HUGE_FILE
);
4288 /* i_block is stored in file system block size */
4289 i_blocks
= i_blocks
>> (inode
->i_blkbits
- 9);
4290 raw_inode
->i_blocks_lo
= cpu_to_le32(i_blocks
);
4291 raw_inode
->i_blocks_high
= cpu_to_le16(i_blocks
>> 32);
4296 struct other_inode
{
4297 unsigned long orig_ino
;
4298 struct ext4_inode
*raw_inode
;
4301 static int other_inode_match(struct inode
* inode
, unsigned long ino
,
4304 struct other_inode
*oi
= (struct other_inode
*) data
;
4306 if ((inode
->i_ino
!= ino
) ||
4307 (inode
->i_state
& (I_FREEING
| I_WILL_FREE
| I_NEW
|
4308 I_DIRTY_SYNC
| I_DIRTY_DATASYNC
)) ||
4309 ((inode
->i_state
& I_DIRTY_TIME
) == 0))
4311 spin_lock(&inode
->i_lock
);
4312 if (((inode
->i_state
& (I_FREEING
| I_WILL_FREE
| I_NEW
|
4313 I_DIRTY_SYNC
| I_DIRTY_DATASYNC
)) == 0) &&
4314 (inode
->i_state
& I_DIRTY_TIME
)) {
4315 struct ext4_inode_info
*ei
= EXT4_I(inode
);
4317 inode
->i_state
&= ~(I_DIRTY_TIME
| I_DIRTY_TIME_EXPIRED
);
4318 spin_unlock(&inode
->i_lock
);
4320 spin_lock(&ei
->i_raw_lock
);
4321 EXT4_INODE_SET_XTIME(i_ctime
, inode
, oi
->raw_inode
);
4322 EXT4_INODE_SET_XTIME(i_mtime
, inode
, oi
->raw_inode
);
4323 EXT4_INODE_SET_XTIME(i_atime
, inode
, oi
->raw_inode
);
4324 ext4_inode_csum_set(inode
, oi
->raw_inode
, ei
);
4325 spin_unlock(&ei
->i_raw_lock
);
4326 trace_ext4_other_inode_update_time(inode
, oi
->orig_ino
);
4329 spin_unlock(&inode
->i_lock
);
4334 * Opportunistically update the other time fields for other inodes in
4335 * the same inode table block.
4337 static void ext4_update_other_inodes_time(struct super_block
*sb
,
4338 unsigned long orig_ino
, char *buf
)
4340 struct other_inode oi
;
4342 int i
, inodes_per_block
= EXT4_SB(sb
)->s_inodes_per_block
;
4343 int inode_size
= EXT4_INODE_SIZE(sb
);
4345 oi
.orig_ino
= orig_ino
;
4346 ino
= orig_ino
& ~(inodes_per_block
- 1);
4347 for (i
= 0; i
< inodes_per_block
; i
++, ino
++, buf
+= inode_size
) {
4348 if (ino
== orig_ino
)
4350 oi
.raw_inode
= (struct ext4_inode
*) buf
;
4351 (void) find_inode_nowait(sb
, ino
, other_inode_match
, &oi
);
4356 * Post the struct inode info into an on-disk inode location in the
4357 * buffer-cache. This gobbles the caller's reference to the
4358 * buffer_head in the inode location struct.
4360 * The caller must have write access to iloc->bh.
4362 static int ext4_do_update_inode(handle_t
*handle
,
4363 struct inode
*inode
,
4364 struct ext4_iloc
*iloc
)
4366 struct ext4_inode
*raw_inode
= ext4_raw_inode(iloc
);
4367 struct ext4_inode_info
*ei
= EXT4_I(inode
);
4368 struct buffer_head
*bh
= iloc
->bh
;
4369 struct super_block
*sb
= inode
->i_sb
;
4370 int err
= 0, rc
, block
;
4371 int need_datasync
= 0, set_large_file
= 0;
4375 spin_lock(&ei
->i_raw_lock
);
4377 /* For fields not tracked in the in-memory inode,
4378 * initialise them to zero for new inodes. */
4379 if (ext4_test_inode_state(inode
, EXT4_STATE_NEW
))
4380 memset(raw_inode
, 0, EXT4_SB(inode
->i_sb
)->s_inode_size
);
4382 ext4_get_inode_flags(ei
);
4383 raw_inode
->i_mode
= cpu_to_le16(inode
->i_mode
);
4384 i_uid
= i_uid_read(inode
);
4385 i_gid
= i_gid_read(inode
);
4386 if (!(test_opt(inode
->i_sb
, NO_UID32
))) {
4387 raw_inode
->i_uid_low
= cpu_to_le16(low_16_bits(i_uid
));
4388 raw_inode
->i_gid_low
= cpu_to_le16(low_16_bits(i_gid
));
4390 * Fix up interoperability with old kernels. Otherwise, old inodes get
4391 * re-used with the upper 16 bits of the uid/gid intact
4394 raw_inode
->i_uid_high
=
4395 cpu_to_le16(high_16_bits(i_uid
));
4396 raw_inode
->i_gid_high
=
4397 cpu_to_le16(high_16_bits(i_gid
));
4399 raw_inode
->i_uid_high
= 0;
4400 raw_inode
->i_gid_high
= 0;
4403 raw_inode
->i_uid_low
= cpu_to_le16(fs_high2lowuid(i_uid
));
4404 raw_inode
->i_gid_low
= cpu_to_le16(fs_high2lowgid(i_gid
));
4405 raw_inode
->i_uid_high
= 0;
4406 raw_inode
->i_gid_high
= 0;
4408 raw_inode
->i_links_count
= cpu_to_le16(inode
->i_nlink
);
4410 EXT4_INODE_SET_XTIME(i_ctime
, inode
, raw_inode
);
4411 EXT4_INODE_SET_XTIME(i_mtime
, inode
, raw_inode
);
4412 EXT4_INODE_SET_XTIME(i_atime
, inode
, raw_inode
);
4413 EXT4_EINODE_SET_XTIME(i_crtime
, ei
, raw_inode
);
4415 err
= ext4_inode_blocks_set(handle
, raw_inode
, ei
);
4417 spin_unlock(&ei
->i_raw_lock
);
4420 raw_inode
->i_dtime
= cpu_to_le32(ei
->i_dtime
);
4421 raw_inode
->i_flags
= cpu_to_le32(ei
->i_flags
& 0xFFFFFFFF);
4422 if (likely(!test_opt2(inode
->i_sb
, HURD_COMPAT
)))
4423 raw_inode
->i_file_acl_high
=
4424 cpu_to_le16(ei
->i_file_acl
>> 32);
4425 raw_inode
->i_file_acl_lo
= cpu_to_le32(ei
->i_file_acl
);
4426 if (ei
->i_disksize
!= ext4_isize(raw_inode
)) {
4427 ext4_isize_set(raw_inode
, ei
->i_disksize
);
4430 if (ei
->i_disksize
> 0x7fffffffULL
) {
4431 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
,
4432 EXT4_FEATURE_RO_COMPAT_LARGE_FILE
) ||
4433 EXT4_SB(sb
)->s_es
->s_rev_level
==
4434 cpu_to_le32(EXT4_GOOD_OLD_REV
))
4437 raw_inode
->i_generation
= cpu_to_le32(inode
->i_generation
);
4438 if (S_ISCHR(inode
->i_mode
) || S_ISBLK(inode
->i_mode
)) {
4439 if (old_valid_dev(inode
->i_rdev
)) {
4440 raw_inode
->i_block
[0] =
4441 cpu_to_le32(old_encode_dev(inode
->i_rdev
));
4442 raw_inode
->i_block
[1] = 0;
4444 raw_inode
->i_block
[0] = 0;
4445 raw_inode
->i_block
[1] =
4446 cpu_to_le32(new_encode_dev(inode
->i_rdev
));
4447 raw_inode
->i_block
[2] = 0;
4449 } else if (!ext4_has_inline_data(inode
)) {
4450 for (block
= 0; block
< EXT4_N_BLOCKS
; block
++)
4451 raw_inode
->i_block
[block
] = ei
->i_data
[block
];
4454 if (likely(!test_opt2(inode
->i_sb
, HURD_COMPAT
))) {
4455 raw_inode
->i_disk_version
= cpu_to_le32(inode
->i_version
);
4456 if (ei
->i_extra_isize
) {
4457 if (EXT4_FITS_IN_INODE(raw_inode
, ei
, i_version_hi
))
4458 raw_inode
->i_version_hi
=
4459 cpu_to_le32(inode
->i_version
>> 32);
4460 raw_inode
->i_extra_isize
=
4461 cpu_to_le16(ei
->i_extra_isize
);
4464 ext4_inode_csum_set(inode
, raw_inode
, ei
);
4465 spin_unlock(&ei
->i_raw_lock
);
4466 if (inode
->i_sb
->s_flags
& MS_LAZYTIME
)
4467 ext4_update_other_inodes_time(inode
->i_sb
, inode
->i_ino
,
4470 BUFFER_TRACE(bh
, "call ext4_handle_dirty_metadata");
4471 rc
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
4474 ext4_clear_inode_state(inode
, EXT4_STATE_NEW
);
4475 if (set_large_file
) {
4476 BUFFER_TRACE(EXT4_SB(sb
)->s_sbh
, "get write access");
4477 err
= ext4_journal_get_write_access(handle
, EXT4_SB(sb
)->s_sbh
);
4480 ext4_update_dynamic_rev(sb
);
4481 EXT4_SET_RO_COMPAT_FEATURE(sb
,
4482 EXT4_FEATURE_RO_COMPAT_LARGE_FILE
);
4483 ext4_handle_sync(handle
);
4484 err
= ext4_handle_dirty_super(handle
, sb
);
4486 ext4_update_inode_fsync_trans(handle
, inode
, need_datasync
);
4489 ext4_std_error(inode
->i_sb
, err
);
4494 * ext4_write_inode()
4496 * We are called from a few places:
4498 * - Within generic_file_aio_write() -> generic_write_sync() for O_SYNC files.
4499 * Here, there will be no transaction running. We wait for any running
4500 * transaction to commit.
4502 * - Within flush work (sys_sync(), kupdate and such).
4503 * We wait on commit, if told to.
4505 * - Within iput_final() -> write_inode_now()
4506 * We wait on commit, if told to.
4508 * In all cases it is actually safe for us to return without doing anything,
4509 * because the inode has been copied into a raw inode buffer in
4510 * ext4_mark_inode_dirty(). This is a correctness thing for WB_SYNC_ALL
4513 * Note that we are absolutely dependent upon all inode dirtiers doing the
4514 * right thing: they *must* call mark_inode_dirty() after dirtying info in
4515 * which we are interested.
4517 * It would be a bug for them to not do this. The code:
4519 * mark_inode_dirty(inode)
4521 * inode->i_size = expr;
4523 * is in error because write_inode() could occur while `stuff()' is running,
4524 * and the new i_size will be lost. Plus the inode will no longer be on the
4525 * superblock's dirty inode list.
4527 int ext4_write_inode(struct inode
*inode
, struct writeback_control
*wbc
)
4531 if (WARN_ON_ONCE(current
->flags
& PF_MEMALLOC
))
4534 if (EXT4_SB(inode
->i_sb
)->s_journal
) {
4535 if (ext4_journal_current_handle()) {
4536 jbd_debug(1, "called recursively, non-PF_MEMALLOC!\n");
4542 * No need to force transaction in WB_SYNC_NONE mode. Also
4543 * ext4_sync_fs() will force the commit after everything is
4546 if (wbc
->sync_mode
!= WB_SYNC_ALL
|| wbc
->for_sync
)
4549 err
= ext4_force_commit(inode
->i_sb
);
4551 struct ext4_iloc iloc
;
4553 err
= __ext4_get_inode_loc(inode
, &iloc
, 0);
4557 * sync(2) will flush the whole buffer cache. No need to do
4558 * it here separately for each inode.
4560 if (wbc
->sync_mode
== WB_SYNC_ALL
&& !wbc
->for_sync
)
4561 sync_dirty_buffer(iloc
.bh
);
4562 if (buffer_req(iloc
.bh
) && !buffer_uptodate(iloc
.bh
)) {
4563 EXT4_ERROR_INODE_BLOCK(inode
, iloc
.bh
->b_blocknr
,
4564 "IO error syncing inode");
4573 * In data=journal mode ext4_journalled_invalidatepage() may fail to invalidate
4574 * buffers that are attached to a page stradding i_size and are undergoing
4575 * commit. In that case we have to wait for commit to finish and try again.
4577 static void ext4_wait_for_tail_page_commit(struct inode
*inode
)
4581 journal_t
*journal
= EXT4_SB(inode
->i_sb
)->s_journal
;
4582 tid_t commit_tid
= 0;
4585 offset
= inode
->i_size
& (PAGE_CACHE_SIZE
- 1);
4587 * All buffers in the last page remain valid? Then there's nothing to
4588 * do. We do the check mainly to optimize the common PAGE_CACHE_SIZE ==
4591 if (offset
> PAGE_CACHE_SIZE
- (1 << inode
->i_blkbits
))
4594 page
= find_lock_page(inode
->i_mapping
,
4595 inode
->i_size
>> PAGE_CACHE_SHIFT
);
4598 ret
= __ext4_journalled_invalidatepage(page
, offset
,
4599 PAGE_CACHE_SIZE
- offset
);
4601 page_cache_release(page
);
4605 read_lock(&journal
->j_state_lock
);
4606 if (journal
->j_committing_transaction
)
4607 commit_tid
= journal
->j_committing_transaction
->t_tid
;
4608 read_unlock(&journal
->j_state_lock
);
4610 jbd2_log_wait_commit(journal
, commit_tid
);
4617 * Called from notify_change.
4619 * We want to trap VFS attempts to truncate the file as soon as
4620 * possible. In particular, we want to make sure that when the VFS
4621 * shrinks i_size, we put the inode on the orphan list and modify
4622 * i_disksize immediately, so that during the subsequent flushing of
4623 * dirty pages and freeing of disk blocks, we can guarantee that any
4624 * commit will leave the blocks being flushed in an unused state on
4625 * disk. (On recovery, the inode will get truncated and the blocks will
4626 * be freed, so we have a strong guarantee that no future commit will
4627 * leave these blocks visible to the user.)
4629 * Another thing we have to assure is that if we are in ordered mode
4630 * and inode is still attached to the committing transaction, we must
4631 * we start writeout of all the dirty pages which are being truncated.
4632 * This way we are sure that all the data written in the previous
4633 * transaction are already on disk (truncate waits for pages under
4636 * Called with inode->i_mutex down.
4638 int ext4_setattr(struct dentry
*dentry
, struct iattr
*attr
)
4640 struct inode
*inode
= d_inode(dentry
);
4643 const unsigned int ia_valid
= attr
->ia_valid
;
4645 error
= inode_change_ok(inode
, attr
);
4649 if (is_quota_modification(inode
, attr
))
4650 dquot_initialize(inode
);
4651 if ((ia_valid
& ATTR_UID
&& !uid_eq(attr
->ia_uid
, inode
->i_uid
)) ||
4652 (ia_valid
& ATTR_GID
&& !gid_eq(attr
->ia_gid
, inode
->i_gid
))) {
4655 /* (user+group)*(old+new) structure, inode write (sb,
4656 * inode block, ? - but truncate inode update has it) */
4657 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
,
4658 (EXT4_MAXQUOTAS_INIT_BLOCKS(inode
->i_sb
) +
4659 EXT4_MAXQUOTAS_DEL_BLOCKS(inode
->i_sb
)) + 3);
4660 if (IS_ERR(handle
)) {
4661 error
= PTR_ERR(handle
);
4664 error
= dquot_transfer(inode
, attr
);
4666 ext4_journal_stop(handle
);
4669 /* Update corresponding info in inode so that everything is in
4670 * one transaction */
4671 if (attr
->ia_valid
& ATTR_UID
)
4672 inode
->i_uid
= attr
->ia_uid
;
4673 if (attr
->ia_valid
& ATTR_GID
)
4674 inode
->i_gid
= attr
->ia_gid
;
4675 error
= ext4_mark_inode_dirty(handle
, inode
);
4676 ext4_journal_stop(handle
);
4679 if (attr
->ia_valid
& ATTR_SIZE
&& attr
->ia_size
!= inode
->i_size
) {
4682 if (!(ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))) {
4683 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
4685 if (attr
->ia_size
> sbi
->s_bitmap_maxbytes
)
4689 if (IS_I_VERSION(inode
) && attr
->ia_size
!= inode
->i_size
)
4690 inode_inc_iversion(inode
);
4692 if (S_ISREG(inode
->i_mode
) &&
4693 (attr
->ia_size
< inode
->i_size
)) {
4694 if (ext4_should_order_data(inode
)) {
4695 error
= ext4_begin_ordered_truncate(inode
,
4700 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 3);
4701 if (IS_ERR(handle
)) {
4702 error
= PTR_ERR(handle
);
4705 if (ext4_handle_valid(handle
)) {
4706 error
= ext4_orphan_add(handle
, inode
);
4709 down_write(&EXT4_I(inode
)->i_data_sem
);
4710 EXT4_I(inode
)->i_disksize
= attr
->ia_size
;
4711 rc
= ext4_mark_inode_dirty(handle
, inode
);
4715 * We have to update i_size under i_data_sem together
4716 * with i_disksize to avoid races with writeback code
4717 * running ext4_wb_update_i_disksize().
4720 i_size_write(inode
, attr
->ia_size
);
4721 up_write(&EXT4_I(inode
)->i_data_sem
);
4722 ext4_journal_stop(handle
);
4724 ext4_orphan_del(NULL
, inode
);
4728 loff_t oldsize
= inode
->i_size
;
4730 i_size_write(inode
, attr
->ia_size
);
4731 pagecache_isize_extended(inode
, oldsize
, inode
->i_size
);
4735 * Blocks are going to be removed from the inode. Wait
4736 * for dio in flight. Temporarily disable
4737 * dioread_nolock to prevent livelock.
4740 if (!ext4_should_journal_data(inode
)) {
4741 ext4_inode_block_unlocked_dio(inode
);
4742 inode_dio_wait(inode
);
4743 ext4_inode_resume_unlocked_dio(inode
);
4745 ext4_wait_for_tail_page_commit(inode
);
4748 * Truncate pagecache after we've waited for commit
4749 * in data=journal mode to make pages freeable.
4751 truncate_pagecache(inode
, inode
->i_size
);
4754 * We want to call ext4_truncate() even if attr->ia_size ==
4755 * inode->i_size for cases like truncation of fallocated space
4757 if (attr
->ia_valid
& ATTR_SIZE
)
4758 ext4_truncate(inode
);
4761 setattr_copy(inode
, attr
);
4762 mark_inode_dirty(inode
);
4766 * If the call to ext4_truncate failed to get a transaction handle at
4767 * all, we need to clean up the in-core orphan list manually.
4769 if (orphan
&& inode
->i_nlink
)
4770 ext4_orphan_del(NULL
, inode
);
4772 if (!rc
&& (ia_valid
& ATTR_MODE
))
4773 rc
= posix_acl_chmod(inode
, inode
->i_mode
);
4776 ext4_std_error(inode
->i_sb
, error
);
4782 int ext4_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
,
4785 struct inode
*inode
;
4786 unsigned long long delalloc_blocks
;
4788 inode
= d_inode(dentry
);
4789 generic_fillattr(inode
, stat
);
4792 * If there is inline data in the inode, the inode will normally not
4793 * have data blocks allocated (it may have an external xattr block).
4794 * Report at least one sector for such files, so tools like tar, rsync,
4795 * others doen't incorrectly think the file is completely sparse.
4797 if (unlikely(ext4_has_inline_data(inode
)))
4798 stat
->blocks
+= (stat
->size
+ 511) >> 9;
4801 * We can't update i_blocks if the block allocation is delayed
4802 * otherwise in the case of system crash before the real block
4803 * allocation is done, we will have i_blocks inconsistent with
4804 * on-disk file blocks.
4805 * We always keep i_blocks updated together with real
4806 * allocation. But to not confuse with user, stat
4807 * will return the blocks that include the delayed allocation
4808 * blocks for this file.
4810 delalloc_blocks
= EXT4_C2B(EXT4_SB(inode
->i_sb
),
4811 EXT4_I(inode
)->i_reserved_data_blocks
);
4812 stat
->blocks
+= delalloc_blocks
<< (inode
->i_sb
->s_blocksize_bits
- 9);
4816 static int ext4_index_trans_blocks(struct inode
*inode
, int lblocks
,
4819 if (!(ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)))
4820 return ext4_ind_trans_blocks(inode
, lblocks
);
4821 return ext4_ext_index_trans_blocks(inode
, pextents
);
4825 * Account for index blocks, block groups bitmaps and block group
4826 * descriptor blocks if modify datablocks and index blocks
4827 * worse case, the indexs blocks spread over different block groups
4829 * If datablocks are discontiguous, they are possible to spread over
4830 * different block groups too. If they are contiguous, with flexbg,
4831 * they could still across block group boundary.
4833 * Also account for superblock, inode, quota and xattr blocks
4835 static int ext4_meta_trans_blocks(struct inode
*inode
, int lblocks
,
4838 ext4_group_t groups
, ngroups
= ext4_get_groups_count(inode
->i_sb
);
4844 * How many index blocks need to touch to map @lblocks logical blocks
4845 * to @pextents physical extents?
4847 idxblocks
= ext4_index_trans_blocks(inode
, lblocks
, pextents
);
4852 * Now let's see how many group bitmaps and group descriptors need
4855 groups
= idxblocks
+ pextents
;
4857 if (groups
> ngroups
)
4859 if (groups
> EXT4_SB(inode
->i_sb
)->s_gdb_count
)
4860 gdpblocks
= EXT4_SB(inode
->i_sb
)->s_gdb_count
;
4862 /* bitmaps and block group descriptor blocks */
4863 ret
+= groups
+ gdpblocks
;
4865 /* Blocks for super block, inode, quota and xattr blocks */
4866 ret
+= EXT4_META_TRANS_BLOCKS(inode
->i_sb
);
4872 * Calculate the total number of credits to reserve to fit
4873 * the modification of a single pages into a single transaction,
4874 * which may include multiple chunks of block allocations.
4876 * This could be called via ext4_write_begin()
4878 * We need to consider the worse case, when
4879 * one new block per extent.
4881 int ext4_writepage_trans_blocks(struct inode
*inode
)
4883 int bpp
= ext4_journal_blocks_per_page(inode
);
4886 ret
= ext4_meta_trans_blocks(inode
, bpp
, bpp
);
4888 /* Account for data blocks for journalled mode */
4889 if (ext4_should_journal_data(inode
))
4895 * Calculate the journal credits for a chunk of data modification.
4897 * This is called from DIO, fallocate or whoever calling
4898 * ext4_map_blocks() to map/allocate a chunk of contiguous disk blocks.
4900 * journal buffers for data blocks are not included here, as DIO
4901 * and fallocate do no need to journal data buffers.
4903 int ext4_chunk_trans_blocks(struct inode
*inode
, int nrblocks
)
4905 return ext4_meta_trans_blocks(inode
, nrblocks
, 1);
4909 * The caller must have previously called ext4_reserve_inode_write().
4910 * Give this, we know that the caller already has write access to iloc->bh.
4912 int ext4_mark_iloc_dirty(handle_t
*handle
,
4913 struct inode
*inode
, struct ext4_iloc
*iloc
)
4917 if (IS_I_VERSION(inode
))
4918 inode_inc_iversion(inode
);
4920 /* the do_update_inode consumes one bh->b_count */
4923 /* ext4_do_update_inode() does jbd2_journal_dirty_metadata */
4924 err
= ext4_do_update_inode(handle
, inode
, iloc
);
4930 * On success, We end up with an outstanding reference count against
4931 * iloc->bh. This _must_ be cleaned up later.
4935 ext4_reserve_inode_write(handle_t
*handle
, struct inode
*inode
,
4936 struct ext4_iloc
*iloc
)
4940 err
= ext4_get_inode_loc(inode
, iloc
);
4942 BUFFER_TRACE(iloc
->bh
, "get_write_access");
4943 err
= ext4_journal_get_write_access(handle
, iloc
->bh
);
4949 ext4_std_error(inode
->i_sb
, err
);
4954 * Expand an inode by new_extra_isize bytes.
4955 * Returns 0 on success or negative error number on failure.
4957 static int ext4_expand_extra_isize(struct inode
*inode
,
4958 unsigned int new_extra_isize
,
4959 struct ext4_iloc iloc
,
4962 struct ext4_inode
*raw_inode
;
4963 struct ext4_xattr_ibody_header
*header
;
4965 if (EXT4_I(inode
)->i_extra_isize
>= new_extra_isize
)
4968 raw_inode
= ext4_raw_inode(&iloc
);
4970 header
= IHDR(inode
, raw_inode
);
4972 /* No extended attributes present */
4973 if (!ext4_test_inode_state(inode
, EXT4_STATE_XATTR
) ||
4974 header
->h_magic
!= cpu_to_le32(EXT4_XATTR_MAGIC
)) {
4975 memset((void *)raw_inode
+ EXT4_GOOD_OLD_INODE_SIZE
, 0,
4977 EXT4_I(inode
)->i_extra_isize
= new_extra_isize
;
4981 /* try to expand with EAs present */
4982 return ext4_expand_extra_isize_ea(inode
, new_extra_isize
,
4987 * What we do here is to mark the in-core inode as clean with respect to inode
4988 * dirtiness (it may still be data-dirty).
4989 * This means that the in-core inode may be reaped by prune_icache
4990 * without having to perform any I/O. This is a very good thing,
4991 * because *any* task may call prune_icache - even ones which
4992 * have a transaction open against a different journal.
4994 * Is this cheating? Not really. Sure, we haven't written the
4995 * inode out, but prune_icache isn't a user-visible syncing function.
4996 * Whenever the user wants stuff synced (sys_sync, sys_msync, sys_fsync)
4997 * we start and wait on commits.
4999 int ext4_mark_inode_dirty(handle_t
*handle
, struct inode
*inode
)
5001 struct ext4_iloc iloc
;
5002 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
5003 static unsigned int mnt_count
;
5007 trace_ext4_mark_inode_dirty(inode
, _RET_IP_
);
5008 err
= ext4_reserve_inode_write(handle
, inode
, &iloc
);
5009 if (ext4_handle_valid(handle
) &&
5010 EXT4_I(inode
)->i_extra_isize
< sbi
->s_want_extra_isize
&&
5011 !ext4_test_inode_state(inode
, EXT4_STATE_NO_EXPAND
)) {
5013 * We need extra buffer credits since we may write into EA block
5014 * with this same handle. If journal_extend fails, then it will
5015 * only result in a minor loss of functionality for that inode.
5016 * If this is felt to be critical, then e2fsck should be run to
5017 * force a large enough s_min_extra_isize.
5019 if ((jbd2_journal_extend(handle
,
5020 EXT4_DATA_TRANS_BLOCKS(inode
->i_sb
))) == 0) {
5021 ret
= ext4_expand_extra_isize(inode
,
5022 sbi
->s_want_extra_isize
,
5025 ext4_set_inode_state(inode
,
5026 EXT4_STATE_NO_EXPAND
);
5028 le16_to_cpu(sbi
->s_es
->s_mnt_count
)) {
5029 ext4_warning(inode
->i_sb
,
5030 "Unable to expand inode %lu. Delete"
5031 " some EAs or run e2fsck.",
5034 le16_to_cpu(sbi
->s_es
->s_mnt_count
);
5040 err
= ext4_mark_iloc_dirty(handle
, inode
, &iloc
);
5045 * ext4_dirty_inode() is called from __mark_inode_dirty()
5047 * We're really interested in the case where a file is being extended.
5048 * i_size has been changed by generic_commit_write() and we thus need
5049 * to include the updated inode in the current transaction.
5051 * Also, dquot_alloc_block() will always dirty the inode when blocks
5052 * are allocated to the file.
5054 * If the inode is marked synchronous, we don't honour that here - doing
5055 * so would cause a commit on atime updates, which we don't bother doing.
5056 * We handle synchronous inodes at the highest possible level.
5058 * If only the I_DIRTY_TIME flag is set, we can skip everything. If
5059 * I_DIRTY_TIME and I_DIRTY_SYNC is set, the only inode fields we need
5060 * to copy into the on-disk inode structure are the timestamp files.
5062 void ext4_dirty_inode(struct inode
*inode
, int flags
)
5066 if (flags
== I_DIRTY_TIME
)
5068 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 2);
5072 ext4_mark_inode_dirty(handle
, inode
);
5074 ext4_journal_stop(handle
);
5081 * Bind an inode's backing buffer_head into this transaction, to prevent
5082 * it from being flushed to disk early. Unlike
5083 * ext4_reserve_inode_write, this leaves behind no bh reference and
5084 * returns no iloc structure, so the caller needs to repeat the iloc
5085 * lookup to mark the inode dirty later.
5087 static int ext4_pin_inode(handle_t
*handle
, struct inode
*inode
)
5089 struct ext4_iloc iloc
;
5093 err
= ext4_get_inode_loc(inode
, &iloc
);
5095 BUFFER_TRACE(iloc
.bh
, "get_write_access");
5096 err
= jbd2_journal_get_write_access(handle
, iloc
.bh
);
5098 err
= ext4_handle_dirty_metadata(handle
,
5104 ext4_std_error(inode
->i_sb
, err
);
5109 int ext4_change_inode_journal_flag(struct inode
*inode
, int val
)
5116 * We have to be very careful here: changing a data block's
5117 * journaling status dynamically is dangerous. If we write a
5118 * data block to the journal, change the status and then delete
5119 * that block, we risk forgetting to revoke the old log record
5120 * from the journal and so a subsequent replay can corrupt data.
5121 * So, first we make sure that the journal is empty and that
5122 * nobody is changing anything.
5125 journal
= EXT4_JOURNAL(inode
);
5128 if (is_journal_aborted(journal
))
5130 /* We have to allocate physical blocks for delalloc blocks
5131 * before flushing journal. otherwise delalloc blocks can not
5132 * be allocated any more. even more truncate on delalloc blocks
5133 * could trigger BUG by flushing delalloc blocks in journal.
5134 * There is no delalloc block in non-journal data mode.
5136 if (val
&& test_opt(inode
->i_sb
, DELALLOC
)) {
5137 err
= ext4_alloc_da_blocks(inode
);
5142 /* Wait for all existing dio workers */
5143 ext4_inode_block_unlocked_dio(inode
);
5144 inode_dio_wait(inode
);
5146 jbd2_journal_lock_updates(journal
);
5149 * OK, there are no updates running now, and all cached data is
5150 * synced to disk. We are now in a completely consistent state
5151 * which doesn't have anything in the journal, and we know that
5152 * no filesystem updates are running, so it is safe to modify
5153 * the inode's in-core data-journaling state flag now.
5157 ext4_set_inode_flag(inode
, EXT4_INODE_JOURNAL_DATA
);
5159 err
= jbd2_journal_flush(journal
);
5161 jbd2_journal_unlock_updates(journal
);
5162 ext4_inode_resume_unlocked_dio(inode
);
5165 ext4_clear_inode_flag(inode
, EXT4_INODE_JOURNAL_DATA
);
5167 ext4_set_aops(inode
);
5169 jbd2_journal_unlock_updates(journal
);
5170 ext4_inode_resume_unlocked_dio(inode
);
5172 /* Finally we can mark the inode as dirty. */
5174 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 1);
5176 return PTR_ERR(handle
);
5178 err
= ext4_mark_inode_dirty(handle
, inode
);
5179 ext4_handle_sync(handle
);
5180 ext4_journal_stop(handle
);
5181 ext4_std_error(inode
->i_sb
, err
);
5186 static int ext4_bh_unmapped(handle_t
*handle
, struct buffer_head
*bh
)
5188 return !buffer_mapped(bh
);
5191 int ext4_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
5193 struct page
*page
= vmf
->page
;
5197 struct file
*file
= vma
->vm_file
;
5198 struct inode
*inode
= file_inode(file
);
5199 struct address_space
*mapping
= inode
->i_mapping
;
5201 get_block_t
*get_block
;
5204 sb_start_pagefault(inode
->i_sb
);
5205 file_update_time(vma
->vm_file
);
5206 /* Delalloc case is easy... */
5207 if (test_opt(inode
->i_sb
, DELALLOC
) &&
5208 !ext4_should_journal_data(inode
) &&
5209 !ext4_nonda_switch(inode
->i_sb
)) {
5211 ret
= __block_page_mkwrite(vma
, vmf
,
5212 ext4_da_get_block_prep
);
5213 } while (ret
== -ENOSPC
&&
5214 ext4_should_retry_alloc(inode
->i_sb
, &retries
));
5219 size
= i_size_read(inode
);
5220 /* Page got truncated from under us? */
5221 if (page
->mapping
!= mapping
|| page_offset(page
) > size
) {
5223 ret
= VM_FAULT_NOPAGE
;
5227 if (page
->index
== size
>> PAGE_CACHE_SHIFT
)
5228 len
= size
& ~PAGE_CACHE_MASK
;
5230 len
= PAGE_CACHE_SIZE
;
5232 * Return if we have all the buffers mapped. This avoids the need to do
5233 * journal_start/journal_stop which can block and take a long time
5235 if (page_has_buffers(page
)) {
5236 if (!ext4_walk_page_buffers(NULL
, page_buffers(page
),
5238 ext4_bh_unmapped
)) {
5239 /* Wait so that we don't change page under IO */
5240 wait_for_stable_page(page
);
5241 ret
= VM_FAULT_LOCKED
;
5246 /* OK, we need to fill the hole... */
5247 if (ext4_should_dioread_nolock(inode
))
5248 get_block
= ext4_get_block_write
;
5250 get_block
= ext4_get_block
;
5252 handle
= ext4_journal_start(inode
, EXT4_HT_WRITE_PAGE
,
5253 ext4_writepage_trans_blocks(inode
));
5254 if (IS_ERR(handle
)) {
5255 ret
= VM_FAULT_SIGBUS
;
5258 ret
= __block_page_mkwrite(vma
, vmf
, get_block
);
5259 if (!ret
&& ext4_should_journal_data(inode
)) {
5260 if (ext4_walk_page_buffers(handle
, page_buffers(page
), 0,
5261 PAGE_CACHE_SIZE
, NULL
, do_journal_get_write_access
)) {
5263 ret
= VM_FAULT_SIGBUS
;
5264 ext4_journal_stop(handle
);
5267 ext4_set_inode_state(inode
, EXT4_STATE_JDATA
);
5269 ext4_journal_stop(handle
);
5270 if (ret
== -ENOSPC
&& ext4_should_retry_alloc(inode
->i_sb
, &retries
))
5273 ret
= block_page_mkwrite_return(ret
);
5275 sb_end_pagefault(inode
->i_sb
);