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/jbd2.h>
24 #include <linux/highuid.h>
25 #include <linux/pagemap.h>
26 #include <linux/quotaops.h>
27 #include <linux/string.h>
28 #include <linux/buffer_head.h>
29 #include <linux/writeback.h>
30 #include <linux/pagevec.h>
31 #include <linux/mpage.h>
32 #include <linux/namei.h>
33 #include <linux/uio.h>
34 #include <linux/bio.h>
35 #include <linux/workqueue.h>
36 #include <linux/kernel.h>
37 #include <linux/printk.h>
38 #include <linux/slab.h>
39 #include <linux/ratelimit.h>
41 #include "ext4_jbd2.h"
46 #include <trace/events/ext4.h>
48 #define MPAGE_DA_EXTENT_TAIL 0x01
50 static __u32
ext4_inode_csum(struct inode
*inode
, struct ext4_inode
*raw
,
51 struct ext4_inode_info
*ei
)
53 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
58 csum_lo
= raw
->i_checksum_lo
;
59 raw
->i_checksum_lo
= 0;
60 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
&&
61 EXT4_FITS_IN_INODE(raw
, ei
, i_checksum_hi
)) {
62 csum_hi
= raw
->i_checksum_hi
;
63 raw
->i_checksum_hi
= 0;
66 csum
= ext4_chksum(sbi
, ei
->i_csum_seed
, (__u8
*)raw
,
67 EXT4_INODE_SIZE(inode
->i_sb
));
69 raw
->i_checksum_lo
= csum_lo
;
70 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
&&
71 EXT4_FITS_IN_INODE(raw
, ei
, i_checksum_hi
))
72 raw
->i_checksum_hi
= csum_hi
;
77 static int ext4_inode_csum_verify(struct inode
*inode
, struct ext4_inode
*raw
,
78 struct ext4_inode_info
*ei
)
80 __u32 provided
, calculated
;
82 if (EXT4_SB(inode
->i_sb
)->s_es
->s_creator_os
!=
83 cpu_to_le32(EXT4_OS_LINUX
) ||
84 !EXT4_HAS_RO_COMPAT_FEATURE(inode
->i_sb
,
85 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))
88 provided
= le16_to_cpu(raw
->i_checksum_lo
);
89 calculated
= ext4_inode_csum(inode
, raw
, ei
);
90 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
&&
91 EXT4_FITS_IN_INODE(raw
, ei
, i_checksum_hi
))
92 provided
|= ((__u32
)le16_to_cpu(raw
->i_checksum_hi
)) << 16;
96 return provided
== calculated
;
99 static void ext4_inode_csum_set(struct inode
*inode
, struct ext4_inode
*raw
,
100 struct ext4_inode_info
*ei
)
104 if (EXT4_SB(inode
->i_sb
)->s_es
->s_creator_os
!=
105 cpu_to_le32(EXT4_OS_LINUX
) ||
106 !EXT4_HAS_RO_COMPAT_FEATURE(inode
->i_sb
,
107 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
))
110 csum
= ext4_inode_csum(inode
, raw
, ei
);
111 raw
->i_checksum_lo
= cpu_to_le16(csum
& 0xFFFF);
112 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
&&
113 EXT4_FITS_IN_INODE(raw
, ei
, i_checksum_hi
))
114 raw
->i_checksum_hi
= cpu_to_le16(csum
>> 16);
117 static inline int ext4_begin_ordered_truncate(struct inode
*inode
,
120 trace_ext4_begin_ordered_truncate(inode
, new_size
);
122 * If jinode is zero, then we never opened the file for
123 * writing, so there's no need to call
124 * jbd2_journal_begin_ordered_truncate() since there's no
125 * outstanding writes we need to flush.
127 if (!EXT4_I(inode
)->jinode
)
129 return jbd2_journal_begin_ordered_truncate(EXT4_JOURNAL(inode
),
130 EXT4_I(inode
)->jinode
,
134 static void ext4_invalidatepage(struct page
*page
, unsigned long offset
);
135 static int __ext4_journalled_writepage(struct page
*page
, unsigned int len
);
136 static int ext4_bh_delay_or_unwritten(handle_t
*handle
, struct buffer_head
*bh
);
137 static int ext4_discard_partial_page_buffers_no_lock(handle_t
*handle
,
138 struct inode
*inode
, struct page
*page
, loff_t from
,
139 loff_t length
, int flags
);
142 * Test whether an inode is a fast symlink.
144 static int ext4_inode_is_fast_symlink(struct inode
*inode
)
146 int ea_blocks
= EXT4_I(inode
)->i_file_acl
?
147 (inode
->i_sb
->s_blocksize
>> 9) : 0;
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 ext4_ioend_wait(inode
);
190 if (inode
->i_nlink
) {
192 * When journalling data dirty buffers are tracked only in the
193 * journal. So although mm thinks everything is clean and
194 * ready for reaping the inode might still have some pages to
195 * write in the running transaction or waiting to be
196 * checkpointed. Thus calling jbd2_journal_invalidatepage()
197 * (via truncate_inode_pages()) to discard these buffers can
198 * cause data loss. Also even if we did not discard these
199 * buffers, we would have no way to find them after the inode
200 * is reaped and thus user could see stale data if he tries to
201 * read them before the transaction is checkpointed. So be
202 * careful and force everything to disk here... We use
203 * ei->i_datasync_tid to store the newest transaction
204 * containing inode's data.
206 * Note that directories do not have this problem because they
207 * don't use page cache.
209 if (ext4_should_journal_data(inode
) &&
210 (S_ISLNK(inode
->i_mode
) || S_ISREG(inode
->i_mode
))) {
211 journal_t
*journal
= EXT4_SB(inode
->i_sb
)->s_journal
;
212 tid_t commit_tid
= EXT4_I(inode
)->i_datasync_tid
;
214 jbd2_log_start_commit(journal
, commit_tid
);
215 jbd2_log_wait_commit(journal
, commit_tid
);
216 filemap_write_and_wait(&inode
->i_data
);
218 truncate_inode_pages(&inode
->i_data
, 0);
222 if (!is_bad_inode(inode
))
223 dquot_initialize(inode
);
225 if (ext4_should_order_data(inode
))
226 ext4_begin_ordered_truncate(inode
, 0);
227 truncate_inode_pages(&inode
->i_data
, 0);
229 if (is_bad_inode(inode
))
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 * Calculate the number of metadata blocks need to reserve
323 * to allocate a block located at @lblock
325 static int ext4_calc_metadata_amount(struct inode
*inode
, ext4_lblk_t lblock
)
327 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))
328 return ext4_ext_calc_metadata_amount(inode
, lblock
);
330 return ext4_ind_calc_metadata_amount(inode
, lblock
);
334 * Called with i_data_sem down, which is important since we can call
335 * ext4_discard_preallocations() from here.
337 void ext4_da_update_reserve_space(struct inode
*inode
,
338 int used
, int quota_claim
)
340 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
341 struct ext4_inode_info
*ei
= EXT4_I(inode
);
343 spin_lock(&ei
->i_block_reservation_lock
);
344 trace_ext4_da_update_reserve_space(inode
, used
, quota_claim
);
345 if (unlikely(used
> ei
->i_reserved_data_blocks
)) {
346 ext4_warning(inode
->i_sb
, "%s: ino %lu, used %d "
347 "with only %d reserved data blocks",
348 __func__
, inode
->i_ino
, used
,
349 ei
->i_reserved_data_blocks
);
351 used
= ei
->i_reserved_data_blocks
;
354 if (unlikely(ei
->i_allocated_meta_blocks
> ei
->i_reserved_meta_blocks
)) {
355 ext4_warning(inode
->i_sb
, "ino %lu, allocated %d "
356 "with only %d reserved metadata blocks "
357 "(releasing %d blocks with reserved %d data blocks)",
358 inode
->i_ino
, ei
->i_allocated_meta_blocks
,
359 ei
->i_reserved_meta_blocks
, used
,
360 ei
->i_reserved_data_blocks
);
362 ei
->i_allocated_meta_blocks
= ei
->i_reserved_meta_blocks
;
365 /* Update per-inode reservations */
366 ei
->i_reserved_data_blocks
-= used
;
367 ei
->i_reserved_meta_blocks
-= ei
->i_allocated_meta_blocks
;
368 percpu_counter_sub(&sbi
->s_dirtyclusters_counter
,
369 used
+ ei
->i_allocated_meta_blocks
);
370 ei
->i_allocated_meta_blocks
= 0;
372 if (ei
->i_reserved_data_blocks
== 0) {
374 * We can release all of the reserved metadata blocks
375 * only when we have written all of the delayed
378 percpu_counter_sub(&sbi
->s_dirtyclusters_counter
,
379 ei
->i_reserved_meta_blocks
);
380 ei
->i_reserved_meta_blocks
= 0;
381 ei
->i_da_metadata_calc_len
= 0;
383 spin_unlock(&EXT4_I(inode
)->i_block_reservation_lock
);
385 /* Update quota subsystem for data blocks */
387 dquot_claim_block(inode
, EXT4_C2B(sbi
, used
));
390 * We did fallocate with an offset that is already delayed
391 * allocated. So on delayed allocated writeback we should
392 * not re-claim the quota for fallocated blocks.
394 dquot_release_reservation_block(inode
, EXT4_C2B(sbi
, used
));
398 * If we have done all the pending block allocations and if
399 * there aren't any writers on the inode, we can discard the
400 * inode's preallocations.
402 if ((ei
->i_reserved_data_blocks
== 0) &&
403 (atomic_read(&inode
->i_writecount
) == 0))
404 ext4_discard_preallocations(inode
);
407 static int __check_block_validity(struct inode
*inode
, const char *func
,
409 struct ext4_map_blocks
*map
)
411 if (!ext4_data_block_valid(EXT4_SB(inode
->i_sb
), map
->m_pblk
,
413 ext4_error_inode(inode
, func
, line
, map
->m_pblk
,
414 "lblock %lu mapped to illegal pblock "
415 "(length %d)", (unsigned long) map
->m_lblk
,
422 #define check_block_validity(inode, map) \
423 __check_block_validity((inode), __func__, __LINE__, (map))
426 * Return the number of contiguous dirty pages in a given inode
427 * starting at page frame idx.
429 static pgoff_t
ext4_num_dirty_pages(struct inode
*inode
, pgoff_t idx
,
430 unsigned int max_pages
)
432 struct address_space
*mapping
= inode
->i_mapping
;
436 int i
, nr_pages
, done
= 0;
440 pagevec_init(&pvec
, 0);
443 nr_pages
= pagevec_lookup_tag(&pvec
, mapping
, &index
,
445 (pgoff_t
)PAGEVEC_SIZE
);
448 for (i
= 0; i
< nr_pages
; i
++) {
449 struct page
*page
= pvec
.pages
[i
];
450 struct buffer_head
*bh
, *head
;
453 if (unlikely(page
->mapping
!= mapping
) ||
455 PageWriteback(page
) ||
456 page
->index
!= idx
) {
461 if (page_has_buffers(page
)) {
462 bh
= head
= page_buffers(page
);
464 if (!buffer_delay(bh
) &&
465 !buffer_unwritten(bh
))
467 bh
= bh
->b_this_page
;
468 } while (!done
&& (bh
!= head
));
475 if (num
>= max_pages
) {
480 pagevec_release(&pvec
);
485 #ifdef ES_AGGRESSIVE_TEST
486 static void ext4_map_blocks_es_recheck(handle_t
*handle
,
488 struct ext4_map_blocks
*es_map
,
489 struct ext4_map_blocks
*map
,
496 * There is a race window that the result is not the same.
497 * e.g. xfstests #223 when dioread_nolock enables. The reason
498 * is that we lookup a block mapping in extent status tree with
499 * out taking i_data_sem. So at the time the unwritten extent
500 * could be converted.
502 if (!(flags
& EXT4_GET_BLOCKS_NO_LOCK
))
503 down_read((&EXT4_I(inode
)->i_data_sem
));
504 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)) {
505 retval
= ext4_ext_map_blocks(handle
, inode
, map
, flags
&
506 EXT4_GET_BLOCKS_KEEP_SIZE
);
508 retval
= ext4_ind_map_blocks(handle
, inode
, map
, flags
&
509 EXT4_GET_BLOCKS_KEEP_SIZE
);
511 if (!(flags
& EXT4_GET_BLOCKS_NO_LOCK
))
512 up_read((&EXT4_I(inode
)->i_data_sem
));
514 * Clear EXT4_MAP_FROM_CLUSTER and EXT4_MAP_BOUNDARY flag
515 * because it shouldn't be marked in es_map->m_flags.
517 map
->m_flags
&= ~(EXT4_MAP_FROM_CLUSTER
| EXT4_MAP_BOUNDARY
);
520 * We don't check m_len because extent will be collpased in status
521 * tree. So the m_len might not equal.
523 if (es_map
->m_lblk
!= map
->m_lblk
||
524 es_map
->m_flags
!= map
->m_flags
||
525 es_map
->m_pblk
!= map
->m_pblk
) {
526 printk("ES cache assertation failed for inode: %lu "
527 "es_cached ex [%d/%d/%llu/%x] != "
528 "found ex [%d/%d/%llu/%x] retval %d flags %x\n",
529 inode
->i_ino
, es_map
->m_lblk
, es_map
->m_len
,
530 es_map
->m_pblk
, es_map
->m_flags
, map
->m_lblk
,
531 map
->m_len
, map
->m_pblk
, map
->m_flags
,
535 #endif /* ES_AGGRESSIVE_TEST */
538 * The ext4_map_blocks() function tries to look up the requested blocks,
539 * and returns if the blocks are already mapped.
541 * Otherwise it takes the write lock of the i_data_sem and allocate blocks
542 * and store the allocated blocks in the result buffer head and mark it
545 * If file type is extents based, it will call ext4_ext_map_blocks(),
546 * Otherwise, call with ext4_ind_map_blocks() to handle indirect mapping
549 * On success, it returns the number of blocks being mapped or allocate.
550 * if create==0 and the blocks are pre-allocated and uninitialized block,
551 * the result buffer head is unmapped. If the create ==1, it will make sure
552 * the buffer head is mapped.
554 * It returns 0 if plain look up failed (blocks have not been allocated), in
555 * that case, buffer head is unmapped
557 * It returns the error in case of allocation failure.
559 int ext4_map_blocks(handle_t
*handle
, struct inode
*inode
,
560 struct ext4_map_blocks
*map
, int flags
)
562 struct extent_status es
;
564 #ifdef ES_AGGRESSIVE_TEST
565 struct ext4_map_blocks orig_map
;
567 memcpy(&orig_map
, map
, sizeof(*map
));
571 ext_debug("ext4_map_blocks(): inode %lu, flag %d, max_blocks %u,"
572 "logical block %lu\n", inode
->i_ino
, flags
, map
->m_len
,
573 (unsigned long) map
->m_lblk
);
575 /* Lookup extent status tree firstly */
576 if (ext4_es_lookup_extent(inode
, map
->m_lblk
, &es
)) {
577 if (ext4_es_is_written(&es
) || ext4_es_is_unwritten(&es
)) {
578 map
->m_pblk
= ext4_es_pblock(&es
) +
579 map
->m_lblk
- es
.es_lblk
;
580 map
->m_flags
|= ext4_es_is_written(&es
) ?
581 EXT4_MAP_MAPPED
: EXT4_MAP_UNWRITTEN
;
582 retval
= es
.es_len
- (map
->m_lblk
- es
.es_lblk
);
583 if (retval
> map
->m_len
)
586 } else if (ext4_es_is_delayed(&es
) || ext4_es_is_hole(&es
)) {
591 #ifdef ES_AGGRESSIVE_TEST
592 ext4_map_blocks_es_recheck(handle
, inode
, map
,
599 * Try to see if we can get the block without requesting a new
602 if (!(flags
& EXT4_GET_BLOCKS_NO_LOCK
))
603 down_read((&EXT4_I(inode
)->i_data_sem
));
604 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)) {
605 retval
= ext4_ext_map_blocks(handle
, inode
, map
, flags
&
606 EXT4_GET_BLOCKS_KEEP_SIZE
);
608 retval
= ext4_ind_map_blocks(handle
, inode
, map
, flags
&
609 EXT4_GET_BLOCKS_KEEP_SIZE
);
613 unsigned long long status
;
615 #ifdef ES_AGGRESSIVE_TEST
616 if (retval
!= map
->m_len
) {
617 printk("ES len assertation failed for inode: %lu "
618 "retval %d != map->m_len %d "
619 "in %s (lookup)\n", inode
->i_ino
, retval
,
620 map
->m_len
, __func__
);
624 status
= map
->m_flags
& EXT4_MAP_UNWRITTEN
?
625 EXTENT_STATUS_UNWRITTEN
: EXTENT_STATUS_WRITTEN
;
626 if (!(flags
& EXT4_GET_BLOCKS_DELALLOC_RESERVE
) &&
627 ext4_find_delalloc_range(inode
, map
->m_lblk
,
628 map
->m_lblk
+ map
->m_len
- 1))
629 status
|= EXTENT_STATUS_DELAYED
;
630 ret
= ext4_es_insert_extent(inode
, map
->m_lblk
,
631 map
->m_len
, map
->m_pblk
, status
);
635 if (!(flags
& EXT4_GET_BLOCKS_NO_LOCK
))
636 up_read((&EXT4_I(inode
)->i_data_sem
));
639 if (retval
> 0 && map
->m_flags
& EXT4_MAP_MAPPED
) {
640 int ret
= check_block_validity(inode
, map
);
645 /* If it is only a block(s) look up */
646 if ((flags
& EXT4_GET_BLOCKS_CREATE
) == 0)
650 * Returns if the blocks have already allocated
652 * Note that if blocks have been preallocated
653 * ext4_ext_get_block() returns the create = 0
654 * with buffer head unmapped.
656 if (retval
> 0 && map
->m_flags
& EXT4_MAP_MAPPED
)
660 * Here we clear m_flags because after allocating an new extent,
661 * it will be set again.
663 map
->m_flags
&= ~EXT4_MAP_FLAGS
;
666 * New blocks allocate and/or writing to uninitialized extent
667 * will possibly result in updating i_data, so we take
668 * the write lock of i_data_sem, and call get_blocks()
669 * with create == 1 flag.
671 down_write((&EXT4_I(inode
)->i_data_sem
));
674 * if the caller is from delayed allocation writeout path
675 * we have already reserved fs blocks for allocation
676 * let the underlying get_block() function know to
677 * avoid double accounting
679 if (flags
& EXT4_GET_BLOCKS_DELALLOC_RESERVE
)
680 ext4_set_inode_state(inode
, EXT4_STATE_DELALLOC_RESERVED
);
682 * We need to check for EXT4 here because migrate
683 * could have changed the inode type in between
685 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)) {
686 retval
= ext4_ext_map_blocks(handle
, inode
, map
, flags
);
688 retval
= ext4_ind_map_blocks(handle
, inode
, map
, flags
);
690 if (retval
> 0 && map
->m_flags
& EXT4_MAP_NEW
) {
692 * We allocated new blocks which will result in
693 * i_data's format changing. Force the migrate
694 * to fail by clearing migrate flags
696 ext4_clear_inode_state(inode
, EXT4_STATE_EXT_MIGRATE
);
700 * Update reserved blocks/metadata blocks after successful
701 * block allocation which had been deferred till now. We don't
702 * support fallocate for non extent files. So we can update
703 * reserve space here.
706 (flags
& EXT4_GET_BLOCKS_DELALLOC_RESERVE
))
707 ext4_da_update_reserve_space(inode
, retval
, 1);
709 if (flags
& EXT4_GET_BLOCKS_DELALLOC_RESERVE
)
710 ext4_clear_inode_state(inode
, EXT4_STATE_DELALLOC_RESERVED
);
714 unsigned long long status
;
716 #ifdef ES_AGGRESSIVE_TEST
717 if (retval
!= map
->m_len
) {
718 printk("ES len assertation failed for inode: %lu "
719 "retval %d != map->m_len %d "
720 "in %s (allocation)\n", inode
->i_ino
, retval
,
721 map
->m_len
, __func__
);
725 status
= map
->m_flags
& EXT4_MAP_UNWRITTEN
?
726 EXTENT_STATUS_UNWRITTEN
: EXTENT_STATUS_WRITTEN
;
727 if (!(flags
& EXT4_GET_BLOCKS_DELALLOC_RESERVE
) &&
728 ext4_find_delalloc_range(inode
, map
->m_lblk
,
729 map
->m_lblk
+ map
->m_len
- 1))
730 status
|= EXTENT_STATUS_DELAYED
;
731 ret
= ext4_es_insert_extent(inode
, map
->m_lblk
, map
->m_len
,
732 map
->m_pblk
, status
);
737 up_write((&EXT4_I(inode
)->i_data_sem
));
738 if (retval
> 0 && map
->m_flags
& EXT4_MAP_MAPPED
) {
739 int ret
= check_block_validity(inode
, map
);
746 /* Maximum number of blocks we map for direct IO at once. */
747 #define DIO_MAX_BLOCKS 4096
749 static int _ext4_get_block(struct inode
*inode
, sector_t iblock
,
750 struct buffer_head
*bh
, int flags
)
752 handle_t
*handle
= ext4_journal_current_handle();
753 struct ext4_map_blocks map
;
754 int ret
= 0, started
= 0;
757 if (ext4_has_inline_data(inode
))
761 map
.m_len
= bh
->b_size
>> inode
->i_blkbits
;
763 if (flags
&& !(flags
& EXT4_GET_BLOCKS_NO_LOCK
) && !handle
) {
764 /* Direct IO write... */
765 if (map
.m_len
> DIO_MAX_BLOCKS
)
766 map
.m_len
= DIO_MAX_BLOCKS
;
767 dio_credits
= ext4_chunk_trans_blocks(inode
, map
.m_len
);
768 handle
= ext4_journal_start(inode
, EXT4_HT_MAP_BLOCKS
,
770 if (IS_ERR(handle
)) {
771 ret
= PTR_ERR(handle
);
777 ret
= ext4_map_blocks(handle
, inode
, &map
, flags
);
779 map_bh(bh
, inode
->i_sb
, map
.m_pblk
);
780 bh
->b_state
= (bh
->b_state
& ~EXT4_MAP_FLAGS
) | map
.m_flags
;
781 bh
->b_size
= inode
->i_sb
->s_blocksize
* map
.m_len
;
785 ext4_journal_stop(handle
);
789 int ext4_get_block(struct inode
*inode
, sector_t iblock
,
790 struct buffer_head
*bh
, int create
)
792 return _ext4_get_block(inode
, iblock
, bh
,
793 create
? EXT4_GET_BLOCKS_CREATE
: 0);
797 * `handle' can be NULL if create is zero
799 struct buffer_head
*ext4_getblk(handle_t
*handle
, struct inode
*inode
,
800 ext4_lblk_t block
, int create
, int *errp
)
802 struct ext4_map_blocks map
;
803 struct buffer_head
*bh
;
806 J_ASSERT(handle
!= NULL
|| create
== 0);
810 err
= ext4_map_blocks(handle
, inode
, &map
,
811 create
? EXT4_GET_BLOCKS_CREATE
: 0);
813 /* ensure we send some value back into *errp */
816 if (create
&& err
== 0)
817 err
= -ENOSPC
; /* should never happen */
823 bh
= sb_getblk(inode
->i_sb
, map
.m_pblk
);
828 if (map
.m_flags
& EXT4_MAP_NEW
) {
829 J_ASSERT(create
!= 0);
830 J_ASSERT(handle
!= NULL
);
833 * Now that we do not always journal data, we should
834 * keep in mind whether this should always journal the
835 * new buffer as metadata. For now, regular file
836 * writes use ext4_get_block instead, so it's not a
840 BUFFER_TRACE(bh
, "call get_create_access");
841 fatal
= ext4_journal_get_create_access(handle
, bh
);
842 if (!fatal
&& !buffer_uptodate(bh
)) {
843 memset(bh
->b_data
, 0, inode
->i_sb
->s_blocksize
);
844 set_buffer_uptodate(bh
);
847 BUFFER_TRACE(bh
, "call ext4_handle_dirty_metadata");
848 err
= ext4_handle_dirty_metadata(handle
, inode
, bh
);
852 BUFFER_TRACE(bh
, "not a new buffer");
862 struct buffer_head
*ext4_bread(handle_t
*handle
, struct inode
*inode
,
863 ext4_lblk_t block
, int create
, int *err
)
865 struct buffer_head
*bh
;
867 bh
= ext4_getblk(handle
, inode
, block
, create
, err
);
870 if (buffer_uptodate(bh
))
872 ll_rw_block(READ
| REQ_META
| REQ_PRIO
, 1, &bh
);
874 if (buffer_uptodate(bh
))
881 int ext4_walk_page_buffers(handle_t
*handle
,
882 struct buffer_head
*head
,
886 int (*fn
)(handle_t
*handle
,
887 struct buffer_head
*bh
))
889 struct buffer_head
*bh
;
890 unsigned block_start
, block_end
;
891 unsigned blocksize
= head
->b_size
;
893 struct buffer_head
*next
;
895 for (bh
= head
, block_start
= 0;
896 ret
== 0 && (bh
!= head
|| !block_start
);
897 block_start
= block_end
, bh
= next
) {
898 next
= bh
->b_this_page
;
899 block_end
= block_start
+ blocksize
;
900 if (block_end
<= from
|| block_start
>= to
) {
901 if (partial
&& !buffer_uptodate(bh
))
905 err
= (*fn
)(handle
, bh
);
913 * To preserve ordering, it is essential that the hole instantiation and
914 * the data write be encapsulated in a single transaction. We cannot
915 * close off a transaction and start a new one between the ext4_get_block()
916 * and the commit_write(). So doing the jbd2_journal_start at the start of
917 * prepare_write() is the right place.
919 * Also, this function can nest inside ext4_writepage(). In that case, we
920 * *know* that ext4_writepage() has generated enough buffer credits to do the
921 * whole page. So we won't block on the journal in that case, which is good,
922 * because the caller may be PF_MEMALLOC.
924 * By accident, ext4 can be reentered when a transaction is open via
925 * quota file writes. If we were to commit the transaction while thus
926 * reentered, there can be a deadlock - we would be holding a quota
927 * lock, and the commit would never complete if another thread had a
928 * transaction open and was blocking on the quota lock - a ranking
931 * So what we do is to rely on the fact that jbd2_journal_stop/journal_start
932 * will _not_ run commit under these circumstances because handle->h_ref
933 * is elevated. We'll still have enough credits for the tiny quotafile
936 int do_journal_get_write_access(handle_t
*handle
,
937 struct buffer_head
*bh
)
939 int dirty
= buffer_dirty(bh
);
942 if (!buffer_mapped(bh
) || buffer_freed(bh
))
945 * __block_write_begin() could have dirtied some buffers. Clean
946 * the dirty bit as jbd2_journal_get_write_access() could complain
947 * otherwise about fs integrity issues. Setting of the dirty bit
948 * by __block_write_begin() isn't a real problem here as we clear
949 * the bit before releasing a page lock and thus writeback cannot
950 * ever write the buffer.
953 clear_buffer_dirty(bh
);
954 ret
= ext4_journal_get_write_access(handle
, bh
);
956 ret
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
960 static int ext4_get_block_write_nolock(struct inode
*inode
, sector_t iblock
,
961 struct buffer_head
*bh_result
, int create
);
962 static int ext4_write_begin(struct file
*file
, struct address_space
*mapping
,
963 loff_t pos
, unsigned len
, unsigned flags
,
964 struct page
**pagep
, void **fsdata
)
966 struct inode
*inode
= mapping
->host
;
967 int ret
, needed_blocks
;
974 trace_ext4_write_begin(inode
, pos
, len
, flags
);
976 * Reserve one block more for addition to orphan list in case
977 * we allocate blocks but write fails for some reason
979 needed_blocks
= ext4_writepage_trans_blocks(inode
) + 1;
980 index
= pos
>> PAGE_CACHE_SHIFT
;
981 from
= pos
& (PAGE_CACHE_SIZE
- 1);
984 if (ext4_test_inode_state(inode
, EXT4_STATE_MAY_INLINE_DATA
)) {
985 ret
= ext4_try_to_write_inline_data(mapping
, inode
, pos
, len
,
994 * grab_cache_page_write_begin() can take a long time if the
995 * system is thrashing due to memory pressure, or if the page
996 * is being written back. So grab it first before we start
997 * the transaction handle. This also allows us to allocate
998 * the page (if needed) without using GFP_NOFS.
1001 page
= grab_cache_page_write_begin(mapping
, index
, flags
);
1007 handle
= ext4_journal_start(inode
, EXT4_HT_WRITE_PAGE
, needed_blocks
);
1008 if (IS_ERR(handle
)) {
1009 page_cache_release(page
);
1010 return PTR_ERR(handle
);
1014 if (page
->mapping
!= mapping
) {
1015 /* The page got truncated from under us */
1017 page_cache_release(page
);
1018 ext4_journal_stop(handle
);
1021 wait_on_page_writeback(page
);
1023 if (ext4_should_dioread_nolock(inode
))
1024 ret
= __block_write_begin(page
, pos
, len
, ext4_get_block_write
);
1026 ret
= __block_write_begin(page
, pos
, len
, ext4_get_block
);
1028 if (!ret
&& ext4_should_journal_data(inode
)) {
1029 ret
= ext4_walk_page_buffers(handle
, page_buffers(page
),
1031 do_journal_get_write_access
);
1037 * __block_write_begin may have instantiated a few blocks
1038 * outside i_size. Trim these off again. Don't need
1039 * i_size_read because we hold i_mutex.
1041 * Add inode to orphan list in case we crash before
1044 if (pos
+ len
> inode
->i_size
&& ext4_can_truncate(inode
))
1045 ext4_orphan_add(handle
, inode
);
1047 ext4_journal_stop(handle
);
1048 if (pos
+ len
> inode
->i_size
) {
1049 ext4_truncate_failed_write(inode
);
1051 * If truncate failed early the inode might
1052 * still be on the orphan list; we need to
1053 * make sure the inode is removed from the
1054 * orphan list in that case.
1057 ext4_orphan_del(NULL
, inode
);
1060 if (ret
== -ENOSPC
&&
1061 ext4_should_retry_alloc(inode
->i_sb
, &retries
))
1063 page_cache_release(page
);
1070 /* For write_end() in data=journal mode */
1071 static int write_end_fn(handle_t
*handle
, struct buffer_head
*bh
)
1073 if (!buffer_mapped(bh
) || buffer_freed(bh
))
1075 set_buffer_uptodate(bh
);
1076 return ext4_handle_dirty_metadata(handle
, NULL
, bh
);
1079 static int ext4_generic_write_end(struct file
*file
,
1080 struct address_space
*mapping
,
1081 loff_t pos
, unsigned len
, unsigned copied
,
1082 struct page
*page
, void *fsdata
)
1084 int i_size_changed
= 0;
1085 struct inode
*inode
= mapping
->host
;
1086 handle_t
*handle
= ext4_journal_current_handle();
1088 if (ext4_has_inline_data(inode
))
1089 copied
= ext4_write_inline_data_end(inode
, pos
, len
,
1092 copied
= block_write_end(file
, mapping
, pos
,
1093 len
, copied
, page
, fsdata
);
1096 * No need to use i_size_read() here, the i_size
1097 * cannot change under us because we hold i_mutex.
1099 * But it's important to update i_size while still holding page lock:
1100 * page writeout could otherwise come in and zero beyond i_size.
1102 if (pos
+ copied
> inode
->i_size
) {
1103 i_size_write(inode
, pos
+ copied
);
1107 if (pos
+ copied
> EXT4_I(inode
)->i_disksize
) {
1108 /* We need to mark inode dirty even if
1109 * new_i_size is less that inode->i_size
1110 * bu greater than i_disksize.(hint delalloc)
1112 ext4_update_i_disksize(inode
, (pos
+ copied
));
1116 page_cache_release(page
);
1119 * Don't mark the inode dirty under page lock. First, it unnecessarily
1120 * makes the holding time of page lock longer. Second, it forces lock
1121 * ordering of page lock and transaction start for journaling
1125 ext4_mark_inode_dirty(handle
, inode
);
1131 * We need to pick up the new inode size which generic_commit_write gave us
1132 * `file' can be NULL - eg, when called from page_symlink().
1134 * ext4 never places buffers on inode->i_mapping->private_list. metadata
1135 * buffers are managed internally.
1137 static int ext4_ordered_write_end(struct file
*file
,
1138 struct address_space
*mapping
,
1139 loff_t pos
, unsigned len
, unsigned copied
,
1140 struct page
*page
, void *fsdata
)
1142 handle_t
*handle
= ext4_journal_current_handle();
1143 struct inode
*inode
= mapping
->host
;
1146 trace_ext4_ordered_write_end(inode
, pos
, len
, copied
);
1147 ret
= ext4_jbd2_file_inode(handle
, inode
);
1150 ret2
= ext4_generic_write_end(file
, mapping
, pos
, len
, copied
,
1153 if (pos
+ len
> inode
->i_size
&& ext4_can_truncate(inode
))
1154 /* if we have allocated more blocks and copied
1155 * less. We will have blocks allocated outside
1156 * inode->i_size. So truncate them
1158 ext4_orphan_add(handle
, inode
);
1163 page_cache_release(page
);
1166 ret2
= ext4_journal_stop(handle
);
1170 if (pos
+ len
> inode
->i_size
) {
1171 ext4_truncate_failed_write(inode
);
1173 * If truncate failed early the inode might still be
1174 * on the orphan list; we need to make sure the inode
1175 * is removed from the orphan list in that case.
1178 ext4_orphan_del(NULL
, inode
);
1182 return ret
? ret
: copied
;
1185 static int ext4_writeback_write_end(struct file
*file
,
1186 struct address_space
*mapping
,
1187 loff_t pos
, unsigned len
, unsigned copied
,
1188 struct page
*page
, void *fsdata
)
1190 handle_t
*handle
= ext4_journal_current_handle();
1191 struct inode
*inode
= mapping
->host
;
1194 trace_ext4_writeback_write_end(inode
, pos
, len
, copied
);
1195 ret2
= ext4_generic_write_end(file
, mapping
, pos
, len
, copied
,
1198 if (pos
+ len
> inode
->i_size
&& ext4_can_truncate(inode
))
1199 /* if we have allocated more blocks and copied
1200 * less. We will have blocks allocated outside
1201 * inode->i_size. So truncate them
1203 ext4_orphan_add(handle
, inode
);
1208 ret2
= ext4_journal_stop(handle
);
1212 if (pos
+ len
> inode
->i_size
) {
1213 ext4_truncate_failed_write(inode
);
1215 * If truncate failed early the inode might still be
1216 * on the orphan list; we need to make sure the inode
1217 * is removed from the orphan list in that case.
1220 ext4_orphan_del(NULL
, inode
);
1223 return ret
? ret
: copied
;
1226 static int ext4_journalled_write_end(struct file
*file
,
1227 struct address_space
*mapping
,
1228 loff_t pos
, unsigned len
, unsigned copied
,
1229 struct page
*page
, void *fsdata
)
1231 handle_t
*handle
= ext4_journal_current_handle();
1232 struct inode
*inode
= mapping
->host
;
1238 trace_ext4_journalled_write_end(inode
, pos
, len
, copied
);
1239 from
= pos
& (PAGE_CACHE_SIZE
- 1);
1242 BUG_ON(!ext4_handle_valid(handle
));
1244 if (ext4_has_inline_data(inode
))
1245 copied
= ext4_write_inline_data_end(inode
, pos
, len
,
1249 if (!PageUptodate(page
))
1251 page_zero_new_buffers(page
, from
+copied
, to
);
1254 ret
= ext4_walk_page_buffers(handle
, page_buffers(page
), from
,
1255 to
, &partial
, write_end_fn
);
1257 SetPageUptodate(page
);
1259 new_i_size
= pos
+ copied
;
1260 if (new_i_size
> inode
->i_size
)
1261 i_size_write(inode
, pos
+copied
);
1262 ext4_set_inode_state(inode
, EXT4_STATE_JDATA
);
1263 EXT4_I(inode
)->i_datasync_tid
= handle
->h_transaction
->t_tid
;
1264 if (new_i_size
> EXT4_I(inode
)->i_disksize
) {
1265 ext4_update_i_disksize(inode
, new_i_size
);
1266 ret2
= ext4_mark_inode_dirty(handle
, inode
);
1272 page_cache_release(page
);
1273 if (pos
+ len
> inode
->i_size
&& ext4_can_truncate(inode
))
1274 /* if we have allocated more blocks and copied
1275 * less. We will have blocks allocated outside
1276 * inode->i_size. So truncate them
1278 ext4_orphan_add(handle
, inode
);
1280 ret2
= ext4_journal_stop(handle
);
1283 if (pos
+ len
> inode
->i_size
) {
1284 ext4_truncate_failed_write(inode
);
1286 * If truncate failed early the inode might still be
1287 * on the orphan list; we need to make sure the inode
1288 * is removed from the orphan list in that case.
1291 ext4_orphan_del(NULL
, inode
);
1294 return ret
? ret
: copied
;
1298 * Reserve a single cluster located at lblock
1300 static int ext4_da_reserve_space(struct inode
*inode
, ext4_lblk_t lblock
)
1303 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
1304 struct ext4_inode_info
*ei
= EXT4_I(inode
);
1305 unsigned int md_needed
;
1307 ext4_lblk_t save_last_lblock
;
1311 * We will charge metadata quota at writeout time; this saves
1312 * us from metadata over-estimation, though we may go over by
1313 * a small amount in the end. Here we just reserve for data.
1315 ret
= dquot_reserve_block(inode
, EXT4_C2B(sbi
, 1));
1320 * recalculate the amount of metadata blocks to reserve
1321 * in order to allocate nrblocks
1322 * worse case is one extent per block
1325 spin_lock(&ei
->i_block_reservation_lock
);
1327 * ext4_calc_metadata_amount() has side effects, which we have
1328 * to be prepared undo if we fail to claim space.
1330 save_len
= ei
->i_da_metadata_calc_len
;
1331 save_last_lblock
= ei
->i_da_metadata_calc_last_lblock
;
1332 md_needed
= EXT4_NUM_B2C(sbi
,
1333 ext4_calc_metadata_amount(inode
, lblock
));
1334 trace_ext4_da_reserve_space(inode
, md_needed
);
1337 * We do still charge estimated metadata to the sb though;
1338 * we cannot afford to run out of free blocks.
1340 if (ext4_claim_free_clusters(sbi
, md_needed
+ 1, 0)) {
1341 ei
->i_da_metadata_calc_len
= save_len
;
1342 ei
->i_da_metadata_calc_last_lblock
= save_last_lblock
;
1343 spin_unlock(&ei
->i_block_reservation_lock
);
1344 if (ext4_should_retry_alloc(inode
->i_sb
, &retries
)) {
1348 dquot_release_reservation_block(inode
, EXT4_C2B(sbi
, 1));
1351 ei
->i_reserved_data_blocks
++;
1352 ei
->i_reserved_meta_blocks
+= md_needed
;
1353 spin_unlock(&ei
->i_block_reservation_lock
);
1355 return 0; /* success */
1358 static void ext4_da_release_space(struct inode
*inode
, int to_free
)
1360 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
1361 struct ext4_inode_info
*ei
= EXT4_I(inode
);
1364 return; /* Nothing to release, exit */
1366 spin_lock(&EXT4_I(inode
)->i_block_reservation_lock
);
1368 trace_ext4_da_release_space(inode
, to_free
);
1369 if (unlikely(to_free
> ei
->i_reserved_data_blocks
)) {
1371 * if there aren't enough reserved blocks, then the
1372 * counter is messed up somewhere. Since this
1373 * function is called from invalidate page, it's
1374 * harmless to return without any action.
1376 ext4_warning(inode
->i_sb
, "ext4_da_release_space: "
1377 "ino %lu, to_free %d with only %d reserved "
1378 "data blocks", inode
->i_ino
, to_free
,
1379 ei
->i_reserved_data_blocks
);
1381 to_free
= ei
->i_reserved_data_blocks
;
1383 ei
->i_reserved_data_blocks
-= to_free
;
1385 if (ei
->i_reserved_data_blocks
== 0) {
1387 * We can release all of the reserved metadata blocks
1388 * only when we have written all of the delayed
1389 * allocation blocks.
1390 * Note that in case of bigalloc, i_reserved_meta_blocks,
1391 * i_reserved_data_blocks, etc. refer to number of clusters.
1393 percpu_counter_sub(&sbi
->s_dirtyclusters_counter
,
1394 ei
->i_reserved_meta_blocks
);
1395 ei
->i_reserved_meta_blocks
= 0;
1396 ei
->i_da_metadata_calc_len
= 0;
1399 /* update fs dirty data blocks counter */
1400 percpu_counter_sub(&sbi
->s_dirtyclusters_counter
, to_free
);
1402 spin_unlock(&EXT4_I(inode
)->i_block_reservation_lock
);
1404 dquot_release_reservation_block(inode
, EXT4_C2B(sbi
, to_free
));
1407 static void ext4_da_page_release_reservation(struct page
*page
,
1408 unsigned long offset
)
1411 struct buffer_head
*head
, *bh
;
1412 unsigned int curr_off
= 0;
1413 struct inode
*inode
= page
->mapping
->host
;
1414 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
1418 head
= page_buffers(page
);
1421 unsigned int next_off
= curr_off
+ bh
->b_size
;
1423 if ((offset
<= curr_off
) && (buffer_delay(bh
))) {
1425 clear_buffer_delay(bh
);
1427 curr_off
= next_off
;
1428 } while ((bh
= bh
->b_this_page
) != head
);
1431 lblk
= page
->index
<< (PAGE_CACHE_SHIFT
- inode
->i_blkbits
);
1432 ext4_es_remove_extent(inode
, lblk
, to_release
);
1435 /* If we have released all the blocks belonging to a cluster, then we
1436 * need to release the reserved space for that cluster. */
1437 num_clusters
= EXT4_NUM_B2C(sbi
, to_release
);
1438 while (num_clusters
> 0) {
1439 lblk
= (page
->index
<< (PAGE_CACHE_SHIFT
- inode
->i_blkbits
)) +
1440 ((num_clusters
- 1) << sbi
->s_cluster_bits
);
1441 if (sbi
->s_cluster_ratio
== 1 ||
1442 !ext4_find_delalloc_cluster(inode
, lblk
))
1443 ext4_da_release_space(inode
, 1);
1450 * Delayed allocation stuff
1454 * mpage_da_submit_io - walks through extent of pages and try to write
1455 * them with writepage() call back
1457 * @mpd->inode: inode
1458 * @mpd->first_page: first page of the extent
1459 * @mpd->next_page: page after the last page of the extent
1461 * By the time mpage_da_submit_io() is called we expect all blocks
1462 * to be allocated. this may be wrong if allocation failed.
1464 * As pages are already locked by write_cache_pages(), we can't use it
1466 static int mpage_da_submit_io(struct mpage_da_data
*mpd
,
1467 struct ext4_map_blocks
*map
)
1469 struct pagevec pvec
;
1470 unsigned long index
, end
;
1471 int ret
= 0, err
, nr_pages
, i
;
1472 struct inode
*inode
= mpd
->inode
;
1473 struct address_space
*mapping
= inode
->i_mapping
;
1474 loff_t size
= i_size_read(inode
);
1475 unsigned int len
, block_start
;
1476 struct buffer_head
*bh
, *page_bufs
= NULL
;
1477 sector_t pblock
= 0, cur_logical
= 0;
1478 struct ext4_io_submit io_submit
;
1480 BUG_ON(mpd
->next_page
<= mpd
->first_page
);
1481 memset(&io_submit
, 0, sizeof(io_submit
));
1483 * We need to start from the first_page to the next_page - 1
1484 * to make sure we also write the mapped dirty buffer_heads.
1485 * If we look at mpd->b_blocknr we would only be looking
1486 * at the currently mapped buffer_heads.
1488 index
= mpd
->first_page
;
1489 end
= mpd
->next_page
- 1;
1491 pagevec_init(&pvec
, 0);
1492 while (index
<= end
) {
1493 nr_pages
= pagevec_lookup(&pvec
, mapping
, index
, PAGEVEC_SIZE
);
1496 for (i
= 0; i
< nr_pages
; i
++) {
1498 struct page
*page
= pvec
.pages
[i
];
1500 index
= page
->index
;
1504 if (index
== size
>> PAGE_CACHE_SHIFT
)
1505 len
= size
& ~PAGE_CACHE_MASK
;
1507 len
= PAGE_CACHE_SIZE
;
1509 cur_logical
= index
<< (PAGE_CACHE_SHIFT
-
1511 pblock
= map
->m_pblk
+ (cur_logical
-
1516 BUG_ON(!PageLocked(page
));
1517 BUG_ON(PageWriteback(page
));
1519 bh
= page_bufs
= page_buffers(page
);
1522 if (map
&& (cur_logical
>= map
->m_lblk
) &&
1523 (cur_logical
<= (map
->m_lblk
+
1524 (map
->m_len
- 1)))) {
1525 if (buffer_delay(bh
)) {
1526 clear_buffer_delay(bh
);
1527 bh
->b_blocknr
= pblock
;
1529 if (buffer_unwritten(bh
) ||
1531 BUG_ON(bh
->b_blocknr
!= pblock
);
1532 if (map
->m_flags
& EXT4_MAP_UNINIT
)
1533 set_buffer_uninit(bh
);
1534 clear_buffer_unwritten(bh
);
1538 * skip page if block allocation undone and
1541 if (ext4_bh_delay_or_unwritten(NULL
, bh
))
1543 bh
= bh
->b_this_page
;
1544 block_start
+= bh
->b_size
;
1547 } while (bh
!= page_bufs
);
1554 clear_page_dirty_for_io(page
);
1555 err
= ext4_bio_write_page(&io_submit
, page
, len
,
1558 mpd
->pages_written
++;
1560 * In error case, we have to continue because
1561 * remaining pages are still locked
1566 pagevec_release(&pvec
);
1568 ext4_io_submit(&io_submit
);
1572 static void ext4_da_block_invalidatepages(struct mpage_da_data
*mpd
)
1576 struct pagevec pvec
;
1577 struct inode
*inode
= mpd
->inode
;
1578 struct address_space
*mapping
= inode
->i_mapping
;
1579 ext4_lblk_t start
, last
;
1581 index
= mpd
->first_page
;
1582 end
= mpd
->next_page
- 1;
1584 start
= index
<< (PAGE_CACHE_SHIFT
- inode
->i_blkbits
);
1585 last
= end
<< (PAGE_CACHE_SHIFT
- inode
->i_blkbits
);
1586 ext4_es_remove_extent(inode
, start
, last
- start
+ 1);
1588 pagevec_init(&pvec
, 0);
1589 while (index
<= end
) {
1590 nr_pages
= pagevec_lookup(&pvec
, mapping
, index
, PAGEVEC_SIZE
);
1593 for (i
= 0; i
< nr_pages
; i
++) {
1594 struct page
*page
= pvec
.pages
[i
];
1595 if (page
->index
> end
)
1597 BUG_ON(!PageLocked(page
));
1598 BUG_ON(PageWriteback(page
));
1599 block_invalidatepage(page
, 0);
1600 ClearPageUptodate(page
);
1603 index
= pvec
.pages
[nr_pages
- 1]->index
+ 1;
1604 pagevec_release(&pvec
);
1609 static void ext4_print_free_blocks(struct inode
*inode
)
1611 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
1612 struct super_block
*sb
= inode
->i_sb
;
1614 ext4_msg(sb
, KERN_CRIT
, "Total free blocks count %lld",
1615 EXT4_C2B(EXT4_SB(inode
->i_sb
),
1616 ext4_count_free_clusters(inode
->i_sb
)));
1617 ext4_msg(sb
, KERN_CRIT
, "Free/Dirty block details");
1618 ext4_msg(sb
, KERN_CRIT
, "free_blocks=%lld",
1619 (long long) EXT4_C2B(EXT4_SB(inode
->i_sb
),
1620 percpu_counter_sum(&sbi
->s_freeclusters_counter
)));
1621 ext4_msg(sb
, KERN_CRIT
, "dirty_blocks=%lld",
1622 (long long) EXT4_C2B(EXT4_SB(inode
->i_sb
),
1623 percpu_counter_sum(&sbi
->s_dirtyclusters_counter
)));
1624 ext4_msg(sb
, KERN_CRIT
, "Block reservation details");
1625 ext4_msg(sb
, KERN_CRIT
, "i_reserved_data_blocks=%u",
1626 EXT4_I(inode
)->i_reserved_data_blocks
);
1627 ext4_msg(sb
, KERN_CRIT
, "i_reserved_meta_blocks=%u",
1628 EXT4_I(inode
)->i_reserved_meta_blocks
);
1633 * mpage_da_map_and_submit - go through given space, map them
1634 * if necessary, and then submit them for I/O
1636 * @mpd - bh describing space
1638 * The function skips space we know is already mapped to disk blocks.
1641 static void mpage_da_map_and_submit(struct mpage_da_data
*mpd
)
1643 int err
, blks
, get_blocks_flags
;
1644 struct ext4_map_blocks map
, *mapp
= NULL
;
1645 sector_t next
= mpd
->b_blocknr
;
1646 unsigned max_blocks
= mpd
->b_size
>> mpd
->inode
->i_blkbits
;
1647 loff_t disksize
= EXT4_I(mpd
->inode
)->i_disksize
;
1648 handle_t
*handle
= NULL
;
1651 * If the blocks are mapped already, or we couldn't accumulate
1652 * any blocks, then proceed immediately to the submission stage.
1654 if ((mpd
->b_size
== 0) ||
1655 ((mpd
->b_state
& (1 << BH_Mapped
)) &&
1656 !(mpd
->b_state
& (1 << BH_Delay
)) &&
1657 !(mpd
->b_state
& (1 << BH_Unwritten
))))
1660 handle
= ext4_journal_current_handle();
1664 * Call ext4_map_blocks() to allocate any delayed allocation
1665 * blocks, or to convert an uninitialized extent to be
1666 * initialized (in the case where we have written into
1667 * one or more preallocated blocks).
1669 * We pass in the magic EXT4_GET_BLOCKS_DELALLOC_RESERVE to
1670 * indicate that we are on the delayed allocation path. This
1671 * affects functions in many different parts of the allocation
1672 * call path. This flag exists primarily because we don't
1673 * want to change *many* call functions, so ext4_map_blocks()
1674 * will set the EXT4_STATE_DELALLOC_RESERVED flag once the
1675 * inode's allocation semaphore is taken.
1677 * If the blocks in questions were delalloc blocks, set
1678 * EXT4_GET_BLOCKS_DELALLOC_RESERVE so the delalloc accounting
1679 * variables are updated after the blocks have been allocated.
1682 map
.m_len
= max_blocks
;
1683 get_blocks_flags
= EXT4_GET_BLOCKS_CREATE
;
1684 if (ext4_should_dioread_nolock(mpd
->inode
))
1685 get_blocks_flags
|= EXT4_GET_BLOCKS_IO_CREATE_EXT
;
1686 if (mpd
->b_state
& (1 << BH_Delay
))
1687 get_blocks_flags
|= EXT4_GET_BLOCKS_DELALLOC_RESERVE
;
1689 blks
= ext4_map_blocks(handle
, mpd
->inode
, &map
, get_blocks_flags
);
1691 struct super_block
*sb
= mpd
->inode
->i_sb
;
1695 * If get block returns EAGAIN or ENOSPC and there
1696 * appears to be free blocks we will just let
1697 * mpage_da_submit_io() unlock all of the pages.
1702 if (err
== -ENOSPC
&& ext4_count_free_clusters(sb
)) {
1708 * get block failure will cause us to loop in
1709 * writepages, because a_ops->writepage won't be able
1710 * to make progress. The page will be redirtied by
1711 * writepage and writepages will again try to write
1714 if (!(EXT4_SB(sb
)->s_mount_flags
& EXT4_MF_FS_ABORTED
)) {
1715 ext4_msg(sb
, KERN_CRIT
,
1716 "delayed block allocation failed for inode %lu "
1717 "at logical offset %llu with max blocks %zd "
1718 "with error %d", mpd
->inode
->i_ino
,
1719 (unsigned long long) next
,
1720 mpd
->b_size
>> mpd
->inode
->i_blkbits
, err
);
1721 ext4_msg(sb
, KERN_CRIT
,
1722 "This should not happen!! Data will be lost");
1724 ext4_print_free_blocks(mpd
->inode
);
1726 /* invalidate all the pages */
1727 ext4_da_block_invalidatepages(mpd
);
1729 /* Mark this page range as having been completed */
1736 if (map
.m_flags
& EXT4_MAP_NEW
) {
1737 struct block_device
*bdev
= mpd
->inode
->i_sb
->s_bdev
;
1740 for (i
= 0; i
< map
.m_len
; i
++)
1741 unmap_underlying_metadata(bdev
, map
.m_pblk
+ i
);
1745 * Update on-disk size along with block allocation.
1747 disksize
= ((loff_t
) next
+ blks
) << mpd
->inode
->i_blkbits
;
1748 if (disksize
> i_size_read(mpd
->inode
))
1749 disksize
= i_size_read(mpd
->inode
);
1750 if (disksize
> EXT4_I(mpd
->inode
)->i_disksize
) {
1751 ext4_update_i_disksize(mpd
->inode
, disksize
);
1752 err
= ext4_mark_inode_dirty(handle
, mpd
->inode
);
1754 ext4_error(mpd
->inode
->i_sb
,
1755 "Failed to mark inode %lu dirty",
1760 mpage_da_submit_io(mpd
, mapp
);
1764 #define BH_FLAGS ((1 << BH_Uptodate) | (1 << BH_Mapped) | \
1765 (1 << BH_Delay) | (1 << BH_Unwritten))
1768 * mpage_add_bh_to_extent - try to add one more block to extent of blocks
1770 * @mpd->lbh - extent of blocks
1771 * @logical - logical number of the block in the file
1772 * @b_state - b_state of the buffer head added
1774 * the function is used to collect contig. blocks in same state
1776 static void mpage_add_bh_to_extent(struct mpage_da_data
*mpd
, sector_t logical
,
1777 unsigned long b_state
)
1780 int blkbits
= mpd
->inode
->i_blkbits
;
1781 int nrblocks
= mpd
->b_size
>> blkbits
;
1784 * XXX Don't go larger than mballoc is willing to allocate
1785 * This is a stopgap solution. We eventually need to fold
1786 * mpage_da_submit_io() into this function and then call
1787 * ext4_map_blocks() multiple times in a loop
1789 if (nrblocks
>= (8*1024*1024 >> blkbits
))
1792 /* check if the reserved journal credits might overflow */
1793 if (!ext4_test_inode_flag(mpd
->inode
, EXT4_INODE_EXTENTS
)) {
1794 if (nrblocks
>= EXT4_MAX_TRANS_DATA
) {
1796 * With non-extent format we are limited by the journal
1797 * credit available. Total credit needed to insert
1798 * nrblocks contiguous blocks is dependent on the
1799 * nrblocks. So limit nrblocks.
1805 * First block in the extent
1807 if (mpd
->b_size
== 0) {
1808 mpd
->b_blocknr
= logical
;
1809 mpd
->b_size
= 1 << blkbits
;
1810 mpd
->b_state
= b_state
& BH_FLAGS
;
1814 next
= mpd
->b_blocknr
+ nrblocks
;
1816 * Can we merge the block to our big extent?
1818 if (logical
== next
&& (b_state
& BH_FLAGS
) == mpd
->b_state
) {
1819 mpd
->b_size
+= 1 << blkbits
;
1825 * We couldn't merge the block to our extent, so we
1826 * need to flush current extent and start new one
1828 mpage_da_map_and_submit(mpd
);
1832 static int ext4_bh_delay_or_unwritten(handle_t
*handle
, struct buffer_head
*bh
)
1834 return (buffer_delay(bh
) || buffer_unwritten(bh
)) && buffer_dirty(bh
);
1838 * This function is grabs code from the very beginning of
1839 * ext4_map_blocks, but assumes that the caller is from delayed write
1840 * time. This function looks up the requested blocks and sets the
1841 * buffer delay bit under the protection of i_data_sem.
1843 static int ext4_da_map_blocks(struct inode
*inode
, sector_t iblock
,
1844 struct ext4_map_blocks
*map
,
1845 struct buffer_head
*bh
)
1847 struct extent_status es
;
1849 sector_t invalid_block
= ~((sector_t
) 0xffff);
1850 #ifdef ES_AGGRESSIVE_TEST
1851 struct ext4_map_blocks orig_map
;
1853 memcpy(&orig_map
, map
, sizeof(*map
));
1856 if (invalid_block
< ext4_blocks_count(EXT4_SB(inode
->i_sb
)->s_es
))
1860 ext_debug("ext4_da_map_blocks(): inode %lu, max_blocks %u,"
1861 "logical block %lu\n", inode
->i_ino
, map
->m_len
,
1862 (unsigned long) map
->m_lblk
);
1864 /* Lookup extent status tree firstly */
1865 if (ext4_es_lookup_extent(inode
, iblock
, &es
)) {
1867 if (ext4_es_is_hole(&es
)) {
1869 down_read((&EXT4_I(inode
)->i_data_sem
));
1874 * Delayed extent could be allocated by fallocate.
1875 * So we need to check it.
1877 if (ext4_es_is_delayed(&es
) && !ext4_es_is_unwritten(&es
)) {
1878 map_bh(bh
, inode
->i_sb
, invalid_block
);
1880 set_buffer_delay(bh
);
1884 map
->m_pblk
= ext4_es_pblock(&es
) + iblock
- es
.es_lblk
;
1885 retval
= es
.es_len
- (iblock
- es
.es_lblk
);
1886 if (retval
> map
->m_len
)
1887 retval
= map
->m_len
;
1888 map
->m_len
= retval
;
1889 if (ext4_es_is_written(&es
))
1890 map
->m_flags
|= EXT4_MAP_MAPPED
;
1891 else if (ext4_es_is_unwritten(&es
))
1892 map
->m_flags
|= EXT4_MAP_UNWRITTEN
;
1896 #ifdef ES_AGGRESSIVE_TEST
1897 ext4_map_blocks_es_recheck(NULL
, inode
, map
, &orig_map
, 0);
1903 * Try to see if we can get the block without requesting a new
1904 * file system block.
1906 down_read((&EXT4_I(inode
)->i_data_sem
));
1907 if (ext4_has_inline_data(inode
)) {
1909 * We will soon create blocks for this page, and let
1910 * us pretend as if the blocks aren't allocated yet.
1911 * In case of clusters, we have to handle the work
1912 * of mapping from cluster so that the reserved space
1913 * is calculated properly.
1915 if ((EXT4_SB(inode
->i_sb
)->s_cluster_ratio
> 1) &&
1916 ext4_find_delalloc_cluster(inode
, map
->m_lblk
))
1917 map
->m_flags
|= EXT4_MAP_FROM_CLUSTER
;
1919 } else if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))
1920 retval
= ext4_ext_map_blocks(NULL
, inode
, map
,
1921 EXT4_GET_BLOCKS_NO_PUT_HOLE
);
1923 retval
= ext4_ind_map_blocks(NULL
, inode
, map
,
1924 EXT4_GET_BLOCKS_NO_PUT_HOLE
);
1930 * XXX: __block_prepare_write() unmaps passed block,
1933 /* If the block was allocated from previously allocated cluster,
1934 * then we dont need to reserve it again. */
1935 if (!(map
->m_flags
& EXT4_MAP_FROM_CLUSTER
)) {
1936 ret
= ext4_da_reserve_space(inode
, iblock
);
1938 /* not enough space to reserve */
1944 ret
= ext4_es_insert_extent(inode
, map
->m_lblk
, map
->m_len
,
1945 ~0, EXTENT_STATUS_DELAYED
);
1951 /* Clear EXT4_MAP_FROM_CLUSTER flag since its purpose is served
1952 * and it should not appear on the bh->b_state.
1954 map
->m_flags
&= ~EXT4_MAP_FROM_CLUSTER
;
1956 map_bh(bh
, inode
->i_sb
, invalid_block
);
1958 set_buffer_delay(bh
);
1959 } else if (retval
> 0) {
1961 unsigned long long status
;
1963 #ifdef ES_AGGRESSIVE_TEST
1964 if (retval
!= map
->m_len
) {
1965 printk("ES len assertation failed for inode: %lu "
1966 "retval %d != map->m_len %d "
1967 "in %s (lookup)\n", inode
->i_ino
, retval
,
1968 map
->m_len
, __func__
);
1972 status
= map
->m_flags
& EXT4_MAP_UNWRITTEN
?
1973 EXTENT_STATUS_UNWRITTEN
: EXTENT_STATUS_WRITTEN
;
1974 ret
= ext4_es_insert_extent(inode
, map
->m_lblk
, map
->m_len
,
1975 map
->m_pblk
, status
);
1981 up_read((&EXT4_I(inode
)->i_data_sem
));
1987 * This is a special get_blocks_t callback which is used by
1988 * ext4_da_write_begin(). It will either return mapped block or
1989 * reserve space for a single block.
1991 * For delayed buffer_head we have BH_Mapped, BH_New, BH_Delay set.
1992 * We also have b_blocknr = -1 and b_bdev initialized properly
1994 * For unwritten buffer_head we have BH_Mapped, BH_New, BH_Unwritten set.
1995 * We also have b_blocknr = physicalblock mapping unwritten extent and b_bdev
1996 * initialized properly.
1998 int ext4_da_get_block_prep(struct inode
*inode
, sector_t iblock
,
1999 struct buffer_head
*bh
, int create
)
2001 struct ext4_map_blocks map
;
2004 BUG_ON(create
== 0);
2005 BUG_ON(bh
->b_size
!= inode
->i_sb
->s_blocksize
);
2007 map
.m_lblk
= iblock
;
2011 * first, we need to know whether the block is allocated already
2012 * preallocated blocks are unmapped but should treated
2013 * the same as allocated blocks.
2015 ret
= ext4_da_map_blocks(inode
, iblock
, &map
, bh
);
2019 map_bh(bh
, inode
->i_sb
, map
.m_pblk
);
2020 bh
->b_state
= (bh
->b_state
& ~EXT4_MAP_FLAGS
) | map
.m_flags
;
2022 if (buffer_unwritten(bh
)) {
2023 /* A delayed write to unwritten bh should be marked
2024 * new and mapped. Mapped ensures that we don't do
2025 * get_block multiple times when we write to the same
2026 * offset and new ensures that we do proper zero out
2027 * for partial write.
2030 set_buffer_mapped(bh
);
2035 static int bget_one(handle_t
*handle
, struct buffer_head
*bh
)
2041 static int bput_one(handle_t
*handle
, struct buffer_head
*bh
)
2047 static int __ext4_journalled_writepage(struct page
*page
,
2050 struct address_space
*mapping
= page
->mapping
;
2051 struct inode
*inode
= mapping
->host
;
2052 struct buffer_head
*page_bufs
= NULL
;
2053 handle_t
*handle
= NULL
;
2054 int ret
= 0, err
= 0;
2055 int inline_data
= ext4_has_inline_data(inode
);
2056 struct buffer_head
*inode_bh
= NULL
;
2058 ClearPageChecked(page
);
2061 BUG_ON(page
->index
!= 0);
2062 BUG_ON(len
> ext4_get_max_inline_size(inode
));
2063 inode_bh
= ext4_journalled_write_inline_data(inode
, len
, page
);
2064 if (inode_bh
== NULL
)
2067 page_bufs
= page_buffers(page
);
2072 ext4_walk_page_buffers(handle
, page_bufs
, 0, len
,
2075 /* As soon as we unlock the page, it can go away, but we have
2076 * references to buffers so we are safe */
2079 handle
= ext4_journal_start(inode
, EXT4_HT_WRITE_PAGE
,
2080 ext4_writepage_trans_blocks(inode
));
2081 if (IS_ERR(handle
)) {
2082 ret
= PTR_ERR(handle
);
2086 BUG_ON(!ext4_handle_valid(handle
));
2089 ret
= ext4_journal_get_write_access(handle
, inode_bh
);
2091 err
= ext4_handle_dirty_metadata(handle
, inode
, inode_bh
);
2094 ret
= ext4_walk_page_buffers(handle
, page_bufs
, 0, len
, NULL
,
2095 do_journal_get_write_access
);
2097 err
= ext4_walk_page_buffers(handle
, page_bufs
, 0, len
, NULL
,
2102 EXT4_I(inode
)->i_datasync_tid
= handle
->h_transaction
->t_tid
;
2103 err
= ext4_journal_stop(handle
);
2107 if (!ext4_has_inline_data(inode
))
2108 ext4_walk_page_buffers(handle
, page_bufs
, 0, len
,
2110 ext4_set_inode_state(inode
, EXT4_STATE_JDATA
);
2117 * Note that we don't need to start a transaction unless we're journaling data
2118 * because we should have holes filled from ext4_page_mkwrite(). We even don't
2119 * need to file the inode to the transaction's list in ordered mode because if
2120 * we are writing back data added by write(), the inode is already there and if
2121 * we are writing back data modified via mmap(), no one guarantees in which
2122 * transaction the data will hit the disk. In case we are journaling data, we
2123 * cannot start transaction directly because transaction start ranks above page
2124 * lock so we have to do some magic.
2126 * This function can get called via...
2127 * - ext4_da_writepages after taking page lock (have journal handle)
2128 * - journal_submit_inode_data_buffers (no journal handle)
2129 * - shrink_page_list via the kswapd/direct reclaim (no journal handle)
2130 * - grab_page_cache when doing write_begin (have journal handle)
2132 * We don't do any block allocation in this function. If we have page with
2133 * multiple blocks we need to write those buffer_heads that are mapped. This
2134 * is important for mmaped based write. So if we do with blocksize 1K
2135 * truncate(f, 1024);
2136 * a = mmap(f, 0, 4096);
2138 * truncate(f, 4096);
2139 * we have in the page first buffer_head mapped via page_mkwrite call back
2140 * but other buffer_heads would be unmapped but dirty (dirty done via the
2141 * do_wp_page). So writepage should write the first block. If we modify
2142 * the mmap area beyond 1024 we will again get a page_fault and the
2143 * page_mkwrite callback will do the block allocation and mark the
2144 * buffer_heads mapped.
2146 * We redirty the page if we have any buffer_heads that is either delay or
2147 * unwritten in the page.
2149 * We can get recursively called as show below.
2151 * ext4_writepage() -> kmalloc() -> __alloc_pages() -> page_launder() ->
2154 * But since we don't do any block allocation we should not deadlock.
2155 * Page also have the dirty flag cleared so we don't get recurive page_lock.
2157 static int ext4_writepage(struct page
*page
,
2158 struct writeback_control
*wbc
)
2163 struct buffer_head
*page_bufs
= NULL
;
2164 struct inode
*inode
= page
->mapping
->host
;
2165 struct ext4_io_submit io_submit
;
2167 trace_ext4_writepage(page
);
2168 size
= i_size_read(inode
);
2169 if (page
->index
== size
>> PAGE_CACHE_SHIFT
)
2170 len
= size
& ~PAGE_CACHE_MASK
;
2172 len
= PAGE_CACHE_SIZE
;
2174 page_bufs
= page_buffers(page
);
2176 * We cannot do block allocation or other extent handling in this
2177 * function. If there are buffers needing that, we have to redirty
2178 * the page. But we may reach here when we do a journal commit via
2179 * journal_submit_inode_data_buffers() and in that case we must write
2180 * allocated buffers to achieve data=ordered mode guarantees.
2182 if (ext4_walk_page_buffers(NULL
, page_bufs
, 0, len
, NULL
,
2183 ext4_bh_delay_or_unwritten
)) {
2184 redirty_page_for_writepage(wbc
, page
);
2185 if (current
->flags
& PF_MEMALLOC
) {
2187 * For memory cleaning there's no point in writing only
2188 * some buffers. So just bail out. Warn if we came here
2189 * from direct reclaim.
2191 WARN_ON_ONCE((current
->flags
& (PF_MEMALLOC
|PF_KSWAPD
))
2198 if (PageChecked(page
) && ext4_should_journal_data(inode
))
2200 * It's mmapped pagecache. Add buffers and journal it. There
2201 * doesn't seem much point in redirtying the page here.
2203 return __ext4_journalled_writepage(page
, len
);
2205 memset(&io_submit
, 0, sizeof(io_submit
));
2206 ret
= ext4_bio_write_page(&io_submit
, page
, len
, wbc
);
2207 ext4_io_submit(&io_submit
);
2212 * This is called via ext4_da_writepages() to
2213 * calculate the total number of credits to reserve to fit
2214 * a single extent allocation into a single transaction,
2215 * ext4_da_writpeages() will loop calling this before
2216 * the block allocation.
2219 static int ext4_da_writepages_trans_blocks(struct inode
*inode
)
2221 int max_blocks
= EXT4_I(inode
)->i_reserved_data_blocks
;
2224 * With non-extent format the journal credit needed to
2225 * insert nrblocks contiguous block is dependent on
2226 * number of contiguous block. So we will limit
2227 * number of contiguous block to a sane value
2229 if (!(ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)) &&
2230 (max_blocks
> EXT4_MAX_TRANS_DATA
))
2231 max_blocks
= EXT4_MAX_TRANS_DATA
;
2233 return ext4_chunk_trans_blocks(inode
, max_blocks
);
2237 * write_cache_pages_da - walk the list of dirty pages of the given
2238 * address space and accumulate pages that need writing, and call
2239 * mpage_da_map_and_submit to map a single contiguous memory region
2240 * and then write them.
2242 static int write_cache_pages_da(handle_t
*handle
,
2243 struct address_space
*mapping
,
2244 struct writeback_control
*wbc
,
2245 struct mpage_da_data
*mpd
,
2246 pgoff_t
*done_index
)
2248 struct buffer_head
*bh
, *head
;
2249 struct inode
*inode
= mapping
->host
;
2250 struct pagevec pvec
;
2251 unsigned int nr_pages
;
2254 long nr_to_write
= wbc
->nr_to_write
;
2255 int i
, tag
, ret
= 0;
2257 memset(mpd
, 0, sizeof(struct mpage_da_data
));
2260 pagevec_init(&pvec
, 0);
2261 index
= wbc
->range_start
>> PAGE_CACHE_SHIFT
;
2262 end
= wbc
->range_end
>> PAGE_CACHE_SHIFT
;
2264 if (wbc
->sync_mode
== WB_SYNC_ALL
|| wbc
->tagged_writepages
)
2265 tag
= PAGECACHE_TAG_TOWRITE
;
2267 tag
= PAGECACHE_TAG_DIRTY
;
2269 *done_index
= index
;
2270 while (index
<= end
) {
2271 nr_pages
= pagevec_lookup_tag(&pvec
, mapping
, &index
, tag
,
2272 min(end
- index
, (pgoff_t
)PAGEVEC_SIZE
-1) + 1);
2276 for (i
= 0; i
< nr_pages
; i
++) {
2277 struct page
*page
= pvec
.pages
[i
];
2280 * At this point, the page may be truncated or
2281 * invalidated (changing page->mapping to NULL), or
2282 * even swizzled back from swapper_space to tmpfs file
2283 * mapping. However, page->index will not change
2284 * because we have a reference on the page.
2286 if (page
->index
> end
)
2289 *done_index
= page
->index
+ 1;
2292 * If we can't merge this page, and we have
2293 * accumulated an contiguous region, write it
2295 if ((mpd
->next_page
!= page
->index
) &&
2296 (mpd
->next_page
!= mpd
->first_page
)) {
2297 mpage_da_map_and_submit(mpd
);
2298 goto ret_extent_tail
;
2304 * If the page is no longer dirty, or its
2305 * mapping no longer corresponds to inode we
2306 * are writing (which means it has been
2307 * truncated or invalidated), or the page is
2308 * already under writeback and we are not
2309 * doing a data integrity writeback, skip the page
2311 if (!PageDirty(page
) ||
2312 (PageWriteback(page
) &&
2313 (wbc
->sync_mode
== WB_SYNC_NONE
)) ||
2314 unlikely(page
->mapping
!= mapping
)) {
2319 wait_on_page_writeback(page
);
2320 BUG_ON(PageWriteback(page
));
2323 * If we have inline data and arrive here, it means that
2324 * we will soon create the block for the 1st page, so
2325 * we'd better clear the inline data here.
2327 if (ext4_has_inline_data(inode
)) {
2328 BUG_ON(ext4_test_inode_state(inode
,
2329 EXT4_STATE_MAY_INLINE_DATA
));
2330 ext4_destroy_inline_data(handle
, inode
);
2333 if (mpd
->next_page
!= page
->index
)
2334 mpd
->first_page
= page
->index
;
2335 mpd
->next_page
= page
->index
+ 1;
2336 logical
= (sector_t
) page
->index
<<
2337 (PAGE_CACHE_SHIFT
- inode
->i_blkbits
);
2339 /* Add all dirty buffers to mpd */
2340 head
= page_buffers(page
);
2343 BUG_ON(buffer_locked(bh
));
2345 * We need to try to allocate unmapped blocks
2346 * in the same page. Otherwise we won't make
2347 * progress with the page in ext4_writepage
2349 if (ext4_bh_delay_or_unwritten(NULL
, bh
)) {
2350 mpage_add_bh_to_extent(mpd
, logical
,
2353 goto ret_extent_tail
;
2354 } else if (buffer_dirty(bh
) &&
2355 buffer_mapped(bh
)) {
2357 * mapped dirty buffer. We need to
2358 * update the b_state because we look
2359 * at b_state in mpage_da_map_blocks.
2360 * We don't update b_size because if we
2361 * find an unmapped buffer_head later
2362 * we need to use the b_state flag of
2365 if (mpd
->b_size
== 0)
2367 bh
->b_state
& BH_FLAGS
;
2370 } while ((bh
= bh
->b_this_page
) != head
);
2372 if (nr_to_write
> 0) {
2374 if (nr_to_write
== 0 &&
2375 wbc
->sync_mode
== WB_SYNC_NONE
)
2377 * We stop writing back only if we are
2378 * not doing integrity sync. In case of
2379 * integrity sync we have to keep going
2380 * because someone may be concurrently
2381 * dirtying pages, and we might have
2382 * synced a lot of newly appeared dirty
2383 * pages, but have not synced all of the
2389 pagevec_release(&pvec
);
2394 ret
= MPAGE_DA_EXTENT_TAIL
;
2396 pagevec_release(&pvec
);
2402 static int ext4_da_writepages(struct address_space
*mapping
,
2403 struct writeback_control
*wbc
)
2406 int range_whole
= 0;
2407 handle_t
*handle
= NULL
;
2408 struct mpage_da_data mpd
;
2409 struct inode
*inode
= mapping
->host
;
2410 int pages_written
= 0;
2411 unsigned int max_pages
;
2412 int range_cyclic
, cycled
= 1, io_done
= 0;
2413 int needed_blocks
, ret
= 0;
2414 long desired_nr_to_write
, nr_to_writebump
= 0;
2415 loff_t range_start
= wbc
->range_start
;
2416 struct ext4_sb_info
*sbi
= EXT4_SB(mapping
->host
->i_sb
);
2417 pgoff_t done_index
= 0;
2419 struct blk_plug plug
;
2421 trace_ext4_da_writepages(inode
, wbc
);
2424 * No pages to write? This is mainly a kludge to avoid starting
2425 * a transaction for special inodes like journal inode on last iput()
2426 * because that could violate lock ordering on umount
2428 if (!mapping
->nrpages
|| !mapping_tagged(mapping
, PAGECACHE_TAG_DIRTY
))
2432 * If the filesystem has aborted, it is read-only, so return
2433 * right away instead of dumping stack traces later on that
2434 * will obscure the real source of the problem. We test
2435 * EXT4_MF_FS_ABORTED instead of sb->s_flag's MS_RDONLY because
2436 * the latter could be true if the filesystem is mounted
2437 * read-only, and in that case, ext4_da_writepages should
2438 * *never* be called, so if that ever happens, we would want
2441 if (unlikely(sbi
->s_mount_flags
& EXT4_MF_FS_ABORTED
))
2444 if (wbc
->range_start
== 0 && wbc
->range_end
== LLONG_MAX
)
2447 range_cyclic
= wbc
->range_cyclic
;
2448 if (wbc
->range_cyclic
) {
2449 index
= mapping
->writeback_index
;
2452 wbc
->range_start
= index
<< PAGE_CACHE_SHIFT
;
2453 wbc
->range_end
= LLONG_MAX
;
2454 wbc
->range_cyclic
= 0;
2457 index
= wbc
->range_start
>> PAGE_CACHE_SHIFT
;
2458 end
= wbc
->range_end
>> PAGE_CACHE_SHIFT
;
2462 * This works around two forms of stupidity. The first is in
2463 * the writeback code, which caps the maximum number of pages
2464 * written to be 1024 pages. This is wrong on multiple
2465 * levels; different architectues have a different page size,
2466 * which changes the maximum amount of data which gets
2467 * written. Secondly, 4 megabytes is way too small. XFS
2468 * forces this value to be 16 megabytes by multiplying
2469 * nr_to_write parameter by four, and then relies on its
2470 * allocator to allocate larger extents to make them
2471 * contiguous. Unfortunately this brings us to the second
2472 * stupidity, which is that ext4's mballoc code only allocates
2473 * at most 2048 blocks. So we force contiguous writes up to
2474 * the number of dirty blocks in the inode, or
2475 * sbi->max_writeback_mb_bump whichever is smaller.
2477 max_pages
= sbi
->s_max_writeback_mb_bump
<< (20 - PAGE_CACHE_SHIFT
);
2478 if (!range_cyclic
&& range_whole
) {
2479 if (wbc
->nr_to_write
== LONG_MAX
)
2480 desired_nr_to_write
= wbc
->nr_to_write
;
2482 desired_nr_to_write
= wbc
->nr_to_write
* 8;
2484 desired_nr_to_write
= ext4_num_dirty_pages(inode
, index
,
2486 if (desired_nr_to_write
> max_pages
)
2487 desired_nr_to_write
= max_pages
;
2489 if (wbc
->nr_to_write
< desired_nr_to_write
) {
2490 nr_to_writebump
= desired_nr_to_write
- wbc
->nr_to_write
;
2491 wbc
->nr_to_write
= desired_nr_to_write
;
2495 if (wbc
->sync_mode
== WB_SYNC_ALL
|| wbc
->tagged_writepages
)
2496 tag_pages_for_writeback(mapping
, index
, end
);
2498 blk_start_plug(&plug
);
2499 while (!ret
&& wbc
->nr_to_write
> 0) {
2502 * we insert one extent at a time. So we need
2503 * credit needed for single extent allocation.
2504 * journalled mode is currently not supported
2507 BUG_ON(ext4_should_journal_data(inode
));
2508 needed_blocks
= ext4_da_writepages_trans_blocks(inode
);
2510 /* start a new transaction*/
2511 handle
= ext4_journal_start(inode
, EXT4_HT_WRITE_PAGE
,
2513 if (IS_ERR(handle
)) {
2514 ret
= PTR_ERR(handle
);
2515 ext4_msg(inode
->i_sb
, KERN_CRIT
, "%s: jbd2_start: "
2516 "%ld pages, ino %lu; err %d", __func__
,
2517 wbc
->nr_to_write
, inode
->i_ino
, ret
);
2518 blk_finish_plug(&plug
);
2519 goto out_writepages
;
2523 * Now call write_cache_pages_da() to find the next
2524 * contiguous region of logical blocks that need
2525 * blocks to be allocated by ext4 and submit them.
2527 ret
= write_cache_pages_da(handle
, mapping
,
2528 wbc
, &mpd
, &done_index
);
2530 * If we have a contiguous extent of pages and we
2531 * haven't done the I/O yet, map the blocks and submit
2534 if (!mpd
.io_done
&& mpd
.next_page
!= mpd
.first_page
) {
2535 mpage_da_map_and_submit(&mpd
);
2536 ret
= MPAGE_DA_EXTENT_TAIL
;
2538 trace_ext4_da_write_pages(inode
, &mpd
);
2539 wbc
->nr_to_write
-= mpd
.pages_written
;
2541 ext4_journal_stop(handle
);
2543 if ((mpd
.retval
== -ENOSPC
) && sbi
->s_journal
) {
2544 /* commit the transaction which would
2545 * free blocks released in the transaction
2548 jbd2_journal_force_commit_nested(sbi
->s_journal
);
2550 } else if (ret
== MPAGE_DA_EXTENT_TAIL
) {
2552 * Got one extent now try with rest of the pages.
2553 * If mpd.retval is set -EIO, journal is aborted.
2554 * So we don't need to write any more.
2556 pages_written
+= mpd
.pages_written
;
2559 } else if (wbc
->nr_to_write
)
2561 * There is no more writeout needed
2562 * or we requested for a noblocking writeout
2563 * and we found the device congested
2567 blk_finish_plug(&plug
);
2568 if (!io_done
&& !cycled
) {
2571 wbc
->range_start
= index
<< PAGE_CACHE_SHIFT
;
2572 wbc
->range_end
= mapping
->writeback_index
- 1;
2577 wbc
->range_cyclic
= range_cyclic
;
2578 if (wbc
->range_cyclic
|| (range_whole
&& wbc
->nr_to_write
> 0))
2580 * set the writeback_index so that range_cyclic
2581 * mode will write it back later
2583 mapping
->writeback_index
= done_index
;
2586 wbc
->nr_to_write
-= nr_to_writebump
;
2587 wbc
->range_start
= range_start
;
2588 trace_ext4_da_writepages_result(inode
, wbc
, ret
, pages_written
);
2592 static int ext4_nonda_switch(struct super_block
*sb
)
2594 s64 free_blocks
, dirty_blocks
;
2595 struct ext4_sb_info
*sbi
= EXT4_SB(sb
);
2598 * switch to non delalloc mode if we are running low
2599 * on free block. The free block accounting via percpu
2600 * counters can get slightly wrong with percpu_counter_batch getting
2601 * accumulated on each CPU without updating global counters
2602 * Delalloc need an accurate free block accounting. So switch
2603 * to non delalloc when we are near to error range.
2605 free_blocks
= EXT4_C2B(sbi
,
2606 percpu_counter_read_positive(&sbi
->s_freeclusters_counter
));
2607 dirty_blocks
= percpu_counter_read_positive(&sbi
->s_dirtyclusters_counter
);
2609 * Start pushing delalloc when 1/2 of free blocks are dirty.
2611 if (dirty_blocks
&& (free_blocks
< 2 * dirty_blocks
) &&
2612 !writeback_in_progress(sb
->s_bdi
) &&
2613 down_read_trylock(&sb
->s_umount
)) {
2614 writeback_inodes_sb(sb
, WB_REASON_FS_FREE_SPACE
);
2615 up_read(&sb
->s_umount
);
2618 if (2 * free_blocks
< 3 * dirty_blocks
||
2619 free_blocks
< (dirty_blocks
+ EXT4_FREECLUSTERS_WATERMARK
)) {
2621 * free block count is less than 150% of dirty blocks
2622 * or free blocks is less than watermark
2629 static int ext4_da_write_begin(struct file
*file
, struct address_space
*mapping
,
2630 loff_t pos
, unsigned len
, unsigned flags
,
2631 struct page
**pagep
, void **fsdata
)
2633 int ret
, retries
= 0;
2636 struct inode
*inode
= mapping
->host
;
2639 index
= pos
>> PAGE_CACHE_SHIFT
;
2641 if (ext4_nonda_switch(inode
->i_sb
)) {
2642 *fsdata
= (void *)FALL_BACK_TO_NONDELALLOC
;
2643 return ext4_write_begin(file
, mapping
, pos
,
2644 len
, flags
, pagep
, fsdata
);
2646 *fsdata
= (void *)0;
2647 trace_ext4_da_write_begin(inode
, pos
, len
, flags
);
2649 if (ext4_test_inode_state(inode
, EXT4_STATE_MAY_INLINE_DATA
)) {
2650 ret
= ext4_da_write_inline_data_begin(mapping
, inode
,
2660 * grab_cache_page_write_begin() can take a long time if the
2661 * system is thrashing due to memory pressure, or if the page
2662 * is being written back. So grab it first before we start
2663 * the transaction handle. This also allows us to allocate
2664 * the page (if needed) without using GFP_NOFS.
2667 page
= grab_cache_page_write_begin(mapping
, index
, flags
);
2673 * With delayed allocation, we don't log the i_disksize update
2674 * if there is delayed block allocation. But we still need
2675 * to journalling the i_disksize update if writes to the end
2676 * of file which has an already mapped buffer.
2679 handle
= ext4_journal_start(inode
, EXT4_HT_WRITE_PAGE
, 1);
2680 if (IS_ERR(handle
)) {
2681 page_cache_release(page
);
2682 return PTR_ERR(handle
);
2686 if (page
->mapping
!= mapping
) {
2687 /* The page got truncated from under us */
2689 page_cache_release(page
);
2690 ext4_journal_stop(handle
);
2693 /* In case writeback began while the page was unlocked */
2694 wait_on_page_writeback(page
);
2696 ret
= __block_write_begin(page
, pos
, len
, ext4_da_get_block_prep
);
2699 ext4_journal_stop(handle
);
2701 * block_write_begin may have instantiated a few blocks
2702 * outside i_size. Trim these off again. Don't need
2703 * i_size_read because we hold i_mutex.
2705 if (pos
+ len
> inode
->i_size
)
2706 ext4_truncate_failed_write(inode
);
2708 if (ret
== -ENOSPC
&&
2709 ext4_should_retry_alloc(inode
->i_sb
, &retries
))
2712 page_cache_release(page
);
2721 * Check if we should update i_disksize
2722 * when write to the end of file but not require block allocation
2724 static int ext4_da_should_update_i_disksize(struct page
*page
,
2725 unsigned long offset
)
2727 struct buffer_head
*bh
;
2728 struct inode
*inode
= page
->mapping
->host
;
2732 bh
= page_buffers(page
);
2733 idx
= offset
>> inode
->i_blkbits
;
2735 for (i
= 0; i
< idx
; i
++)
2736 bh
= bh
->b_this_page
;
2738 if (!buffer_mapped(bh
) || (buffer_delay(bh
)) || buffer_unwritten(bh
))
2743 static int ext4_da_write_end(struct file
*file
,
2744 struct address_space
*mapping
,
2745 loff_t pos
, unsigned len
, unsigned copied
,
2746 struct page
*page
, void *fsdata
)
2748 struct inode
*inode
= mapping
->host
;
2750 handle_t
*handle
= ext4_journal_current_handle();
2752 unsigned long start
, end
;
2753 int write_mode
= (int)(unsigned long)fsdata
;
2755 if (write_mode
== FALL_BACK_TO_NONDELALLOC
) {
2756 switch (ext4_inode_journal_mode(inode
)) {
2757 case EXT4_INODE_ORDERED_DATA_MODE
:
2758 return ext4_ordered_write_end(file
, mapping
, pos
,
2759 len
, copied
, page
, fsdata
);
2760 case EXT4_INODE_WRITEBACK_DATA_MODE
:
2761 return ext4_writeback_write_end(file
, mapping
, pos
,
2762 len
, copied
, page
, fsdata
);
2768 trace_ext4_da_write_end(inode
, pos
, len
, copied
);
2769 start
= pos
& (PAGE_CACHE_SIZE
- 1);
2770 end
= start
+ copied
- 1;
2773 * generic_write_end() will run mark_inode_dirty() if i_size
2774 * changes. So let's piggyback the i_disksize mark_inode_dirty
2777 new_i_size
= pos
+ copied
;
2778 if (copied
&& new_i_size
> EXT4_I(inode
)->i_disksize
) {
2779 if (ext4_has_inline_data(inode
) ||
2780 ext4_da_should_update_i_disksize(page
, end
)) {
2781 down_write(&EXT4_I(inode
)->i_data_sem
);
2782 if (new_i_size
> EXT4_I(inode
)->i_disksize
)
2783 EXT4_I(inode
)->i_disksize
= new_i_size
;
2784 up_write(&EXT4_I(inode
)->i_data_sem
);
2785 /* We need to mark inode dirty even if
2786 * new_i_size is less that inode->i_size
2787 * bu greater than i_disksize.(hint delalloc)
2789 ext4_mark_inode_dirty(handle
, inode
);
2793 if (write_mode
!= CONVERT_INLINE_DATA
&&
2794 ext4_test_inode_state(inode
, EXT4_STATE_MAY_INLINE_DATA
) &&
2795 ext4_has_inline_data(inode
))
2796 ret2
= ext4_da_write_inline_data_end(inode
, pos
, len
, copied
,
2799 ret2
= generic_write_end(file
, mapping
, pos
, len
, copied
,
2805 ret2
= ext4_journal_stop(handle
);
2809 return ret
? ret
: copied
;
2812 static void ext4_da_invalidatepage(struct page
*page
, unsigned long offset
)
2815 * Drop reserved blocks
2817 BUG_ON(!PageLocked(page
));
2818 if (!page_has_buffers(page
))
2821 ext4_da_page_release_reservation(page
, offset
);
2824 ext4_invalidatepage(page
, offset
);
2830 * Force all delayed allocation blocks to be allocated for a given inode.
2832 int ext4_alloc_da_blocks(struct inode
*inode
)
2834 trace_ext4_alloc_da_blocks(inode
);
2836 if (!EXT4_I(inode
)->i_reserved_data_blocks
&&
2837 !EXT4_I(inode
)->i_reserved_meta_blocks
)
2841 * We do something simple for now. The filemap_flush() will
2842 * also start triggering a write of the data blocks, which is
2843 * not strictly speaking necessary (and for users of
2844 * laptop_mode, not even desirable). However, to do otherwise
2845 * would require replicating code paths in:
2847 * ext4_da_writepages() ->
2848 * write_cache_pages() ---> (via passed in callback function)
2849 * __mpage_da_writepage() -->
2850 * mpage_add_bh_to_extent()
2851 * mpage_da_map_blocks()
2853 * The problem is that write_cache_pages(), located in
2854 * mm/page-writeback.c, marks pages clean in preparation for
2855 * doing I/O, which is not desirable if we're not planning on
2858 * We could call write_cache_pages(), and then redirty all of
2859 * the pages by calling redirty_page_for_writepage() but that
2860 * would be ugly in the extreme. So instead we would need to
2861 * replicate parts of the code in the above functions,
2862 * simplifying them because we wouldn't actually intend to
2863 * write out the pages, but rather only collect contiguous
2864 * logical block extents, call the multi-block allocator, and
2865 * then update the buffer heads with the block allocations.
2867 * For now, though, we'll cheat by calling filemap_flush(),
2868 * which will map the blocks, and start the I/O, but not
2869 * actually wait for the I/O to complete.
2871 return filemap_flush(inode
->i_mapping
);
2875 * bmap() is special. It gets used by applications such as lilo and by
2876 * the swapper to find the on-disk block of a specific piece of data.
2878 * Naturally, this is dangerous if the block concerned is still in the
2879 * journal. If somebody makes a swapfile on an ext4 data-journaling
2880 * filesystem and enables swap, then they may get a nasty shock when the
2881 * data getting swapped to that swapfile suddenly gets overwritten by
2882 * the original zero's written out previously to the journal and
2883 * awaiting writeback in the kernel's buffer cache.
2885 * So, if we see any bmap calls here on a modified, data-journaled file,
2886 * take extra steps to flush any blocks which might be in the cache.
2888 static sector_t
ext4_bmap(struct address_space
*mapping
, sector_t block
)
2890 struct inode
*inode
= mapping
->host
;
2895 * We can get here for an inline file via the FIBMAP ioctl
2897 if (ext4_has_inline_data(inode
))
2900 if (mapping_tagged(mapping
, PAGECACHE_TAG_DIRTY
) &&
2901 test_opt(inode
->i_sb
, DELALLOC
)) {
2903 * With delalloc we want to sync the file
2904 * so that we can make sure we allocate
2907 filemap_write_and_wait(mapping
);
2910 if (EXT4_JOURNAL(inode
) &&
2911 ext4_test_inode_state(inode
, EXT4_STATE_JDATA
)) {
2913 * This is a REALLY heavyweight approach, but the use of
2914 * bmap on dirty files is expected to be extremely rare:
2915 * only if we run lilo or swapon on a freshly made file
2916 * do we expect this to happen.
2918 * (bmap requires CAP_SYS_RAWIO so this does not
2919 * represent an unprivileged user DOS attack --- we'd be
2920 * in trouble if mortal users could trigger this path at
2923 * NB. EXT4_STATE_JDATA is not set on files other than
2924 * regular files. If somebody wants to bmap a directory
2925 * or symlink and gets confused because the buffer
2926 * hasn't yet been flushed to disk, they deserve
2927 * everything they get.
2930 ext4_clear_inode_state(inode
, EXT4_STATE_JDATA
);
2931 journal
= EXT4_JOURNAL(inode
);
2932 jbd2_journal_lock_updates(journal
);
2933 err
= jbd2_journal_flush(journal
);
2934 jbd2_journal_unlock_updates(journal
);
2940 return generic_block_bmap(mapping
, block
, ext4_get_block
);
2943 static int ext4_readpage(struct file
*file
, struct page
*page
)
2946 struct inode
*inode
= page
->mapping
->host
;
2948 trace_ext4_readpage(page
);
2950 if (ext4_has_inline_data(inode
))
2951 ret
= ext4_readpage_inline(inode
, page
);
2954 return mpage_readpage(page
, ext4_get_block
);
2960 ext4_readpages(struct file
*file
, struct address_space
*mapping
,
2961 struct list_head
*pages
, unsigned nr_pages
)
2963 struct inode
*inode
= mapping
->host
;
2965 /* If the file has inline data, no need to do readpages. */
2966 if (ext4_has_inline_data(inode
))
2969 return mpage_readpages(mapping
, pages
, nr_pages
, ext4_get_block
);
2972 static void ext4_invalidatepage(struct page
*page
, unsigned long offset
)
2974 trace_ext4_invalidatepage(page
, offset
);
2976 /* No journalling happens on data buffers when this function is used */
2977 WARN_ON(page_has_buffers(page
) && buffer_jbd(page_buffers(page
)));
2979 block_invalidatepage(page
, offset
);
2982 static int __ext4_journalled_invalidatepage(struct page
*page
,
2983 unsigned long offset
)
2985 journal_t
*journal
= EXT4_JOURNAL(page
->mapping
->host
);
2987 trace_ext4_journalled_invalidatepage(page
, offset
);
2990 * If it's a full truncate we just forget about the pending dirtying
2993 ClearPageChecked(page
);
2995 return jbd2_journal_invalidatepage(journal
, page
, offset
);
2998 /* Wrapper for aops... */
2999 static void ext4_journalled_invalidatepage(struct page
*page
,
3000 unsigned long offset
)
3002 WARN_ON(__ext4_journalled_invalidatepage(page
, offset
) < 0);
3005 static int ext4_releasepage(struct page
*page
, gfp_t wait
)
3007 journal_t
*journal
= EXT4_JOURNAL(page
->mapping
->host
);
3009 trace_ext4_releasepage(page
);
3011 WARN_ON(PageChecked(page
));
3012 if (!page_has_buffers(page
))
3015 return jbd2_journal_try_to_free_buffers(journal
, page
, wait
);
3017 return try_to_free_buffers(page
);
3021 * ext4_get_block used when preparing for a DIO write or buffer write.
3022 * We allocate an uinitialized extent if blocks haven't been allocated.
3023 * The extent will be converted to initialized after the IO is complete.
3025 int ext4_get_block_write(struct inode
*inode
, sector_t iblock
,
3026 struct buffer_head
*bh_result
, int create
)
3028 ext4_debug("ext4_get_block_write: inode %lu, create flag %d\n",
3029 inode
->i_ino
, create
);
3030 return _ext4_get_block(inode
, iblock
, bh_result
,
3031 EXT4_GET_BLOCKS_IO_CREATE_EXT
);
3034 static int ext4_get_block_write_nolock(struct inode
*inode
, sector_t iblock
,
3035 struct buffer_head
*bh_result
, int create
)
3037 ext4_debug("ext4_get_block_write_nolock: inode %lu, create flag %d\n",
3038 inode
->i_ino
, create
);
3039 return _ext4_get_block(inode
, iblock
, bh_result
,
3040 EXT4_GET_BLOCKS_NO_LOCK
);
3043 static void ext4_end_io_dio(struct kiocb
*iocb
, loff_t offset
,
3044 ssize_t size
, void *private, int ret
,
3047 struct inode
*inode
= iocb
->ki_filp
->f_path
.dentry
->d_inode
;
3048 ext4_io_end_t
*io_end
= iocb
->private;
3050 /* if not async direct IO or dio with 0 bytes write, just return */
3051 if (!io_end
|| !size
)
3054 ext_debug("ext4_end_io_dio(): io_end 0x%p "
3055 "for inode %lu, iocb 0x%p, offset %llu, size %zd\n",
3056 iocb
->private, io_end
->inode
->i_ino
, iocb
, offset
,
3059 iocb
->private = NULL
;
3061 /* if not aio dio with unwritten extents, just free io and return */
3062 if (!(io_end
->flag
& EXT4_IO_END_UNWRITTEN
)) {
3063 ext4_free_io_end(io_end
);
3065 inode_dio_done(inode
);
3067 aio_complete(iocb
, ret
, 0);
3071 io_end
->offset
= offset
;
3072 io_end
->size
= size
;
3074 io_end
->iocb
= iocb
;
3075 io_end
->result
= ret
;
3078 ext4_add_complete_io(io_end
);
3082 * For ext4 extent files, ext4 will do direct-io write to holes,
3083 * preallocated extents, and those write extend the file, no need to
3084 * fall back to buffered IO.
3086 * For holes, we fallocate those blocks, mark them as uninitialized
3087 * If those blocks were preallocated, we mark sure they are split, but
3088 * still keep the range to write as uninitialized.
3090 * The unwritten extents will be converted to written when DIO is completed.
3091 * For async direct IO, since the IO may still pending when return, we
3092 * set up an end_io call back function, which will do the conversion
3093 * when async direct IO completed.
3095 * If the O_DIRECT write will extend the file then add this inode to the
3096 * orphan list. So recovery will truncate it back to the original size
3097 * if the machine crashes during the write.
3100 static ssize_t
ext4_ext_direct_IO(int rw
, struct kiocb
*iocb
,
3101 const struct iovec
*iov
, loff_t offset
,
3102 unsigned long nr_segs
)
3104 struct file
*file
= iocb
->ki_filp
;
3105 struct inode
*inode
= file
->f_mapping
->host
;
3107 size_t count
= iov_length(iov
, nr_segs
);
3109 get_block_t
*get_block_func
= NULL
;
3111 loff_t final_size
= offset
+ count
;
3113 /* Use the old path for reads and writes beyond i_size. */
3114 if (rw
!= WRITE
|| final_size
> inode
->i_size
)
3115 return ext4_ind_direct_IO(rw
, iocb
, iov
, offset
, nr_segs
);
3117 BUG_ON(iocb
->private == NULL
);
3119 /* If we do a overwrite dio, i_mutex locking can be released */
3120 overwrite
= *((int *)iocb
->private);
3123 atomic_inc(&inode
->i_dio_count
);
3124 down_read(&EXT4_I(inode
)->i_data_sem
);
3125 mutex_unlock(&inode
->i_mutex
);
3129 * We could direct write to holes and fallocate.
3131 * Allocated blocks to fill the hole are marked as
3132 * uninitialized to prevent parallel buffered read to expose
3133 * the stale data before DIO complete the data IO.
3135 * As to previously fallocated extents, ext4 get_block will
3136 * just simply mark the buffer mapped but still keep the
3137 * extents uninitialized.
3139 * For non AIO case, we will convert those unwritten extents
3140 * to written after return back from blockdev_direct_IO.
3142 * For async DIO, the conversion needs to be deferred when the
3143 * IO is completed. The ext4 end_io callback function will be
3144 * called to take care of the conversion work. Here for async
3145 * case, we allocate an io_end structure to hook to the iocb.
3147 iocb
->private = NULL
;
3148 ext4_inode_aio_set(inode
, NULL
);
3149 if (!is_sync_kiocb(iocb
)) {
3150 ext4_io_end_t
*io_end
= ext4_init_io_end(inode
, GFP_NOFS
);
3155 io_end
->flag
|= EXT4_IO_END_DIRECT
;
3156 iocb
->private = io_end
;
3158 * we save the io structure for current async direct
3159 * IO, so that later ext4_map_blocks() could flag the
3160 * io structure whether there is a unwritten extents
3161 * needs to be converted when IO is completed.
3163 ext4_inode_aio_set(inode
, io_end
);
3167 get_block_func
= ext4_get_block_write_nolock
;
3169 get_block_func
= ext4_get_block_write
;
3170 dio_flags
= DIO_LOCKING
;
3172 ret
= __blockdev_direct_IO(rw
, iocb
, inode
,
3173 inode
->i_sb
->s_bdev
, iov
,
3181 ext4_inode_aio_set(inode
, NULL
);
3183 * The io_end structure takes a reference to the inode, that
3184 * structure needs to be destroyed and the reference to the
3185 * inode need to be dropped, when IO is complete, even with 0
3186 * byte write, or failed.
3188 * In the successful AIO DIO case, the io_end structure will
3189 * be destroyed and the reference to the inode will be dropped
3190 * after the end_io call back function is called.
3192 * In the case there is 0 byte write, or error case, since VFS
3193 * direct IO won't invoke the end_io call back function, we
3194 * need to free the end_io structure here.
3196 if (ret
!= -EIOCBQUEUED
&& ret
<= 0 && iocb
->private) {
3197 ext4_free_io_end(iocb
->private);
3198 iocb
->private = NULL
;
3199 } else if (ret
> 0 && !overwrite
&& ext4_test_inode_state(inode
,
3200 EXT4_STATE_DIO_UNWRITTEN
)) {
3203 * for non AIO case, since the IO is already
3204 * completed, we could do the conversion right here
3206 err
= ext4_convert_unwritten_extents(inode
,
3210 ext4_clear_inode_state(inode
, EXT4_STATE_DIO_UNWRITTEN
);
3214 /* take i_mutex locking again if we do a ovewrite dio */
3216 inode_dio_done(inode
);
3217 up_read(&EXT4_I(inode
)->i_data_sem
);
3218 mutex_lock(&inode
->i_mutex
);
3224 static ssize_t
ext4_direct_IO(int rw
, struct kiocb
*iocb
,
3225 const struct iovec
*iov
, loff_t offset
,
3226 unsigned long nr_segs
)
3228 struct file
*file
= iocb
->ki_filp
;
3229 struct inode
*inode
= file
->f_mapping
->host
;
3233 * If we are doing data journalling we don't support O_DIRECT
3235 if (ext4_should_journal_data(inode
))
3238 /* Let buffer I/O handle the inline data case. */
3239 if (ext4_has_inline_data(inode
))
3242 trace_ext4_direct_IO_enter(inode
, offset
, iov_length(iov
, nr_segs
), rw
);
3243 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))
3244 ret
= ext4_ext_direct_IO(rw
, iocb
, iov
, offset
, nr_segs
);
3246 ret
= ext4_ind_direct_IO(rw
, iocb
, iov
, offset
, nr_segs
);
3247 trace_ext4_direct_IO_exit(inode
, offset
,
3248 iov_length(iov
, nr_segs
), rw
, ret
);
3253 * Pages can be marked dirty completely asynchronously from ext4's journalling
3254 * activity. By filemap_sync_pte(), try_to_unmap_one(), etc. We cannot do
3255 * much here because ->set_page_dirty is called under VFS locks. The page is
3256 * not necessarily locked.
3258 * We cannot just dirty the page and leave attached buffers clean, because the
3259 * buffers' dirty state is "definitive". We cannot just set the buffers dirty
3260 * or jbddirty because all the journalling code will explode.
3262 * So what we do is to mark the page "pending dirty" and next time writepage
3263 * is called, propagate that into the buffers appropriately.
3265 static int ext4_journalled_set_page_dirty(struct page
*page
)
3267 SetPageChecked(page
);
3268 return __set_page_dirty_nobuffers(page
);
3271 static const struct address_space_operations ext4_ordered_aops
= {
3272 .readpage
= ext4_readpage
,
3273 .readpages
= ext4_readpages
,
3274 .writepage
= ext4_writepage
,
3275 .write_begin
= ext4_write_begin
,
3276 .write_end
= ext4_ordered_write_end
,
3278 .invalidatepage
= ext4_invalidatepage
,
3279 .releasepage
= ext4_releasepage
,
3280 .direct_IO
= ext4_direct_IO
,
3281 .migratepage
= buffer_migrate_page
,
3282 .is_partially_uptodate
= block_is_partially_uptodate
,
3283 .error_remove_page
= generic_error_remove_page
,
3286 static const struct address_space_operations ext4_writeback_aops
= {
3287 .readpage
= ext4_readpage
,
3288 .readpages
= ext4_readpages
,
3289 .writepage
= ext4_writepage
,
3290 .write_begin
= ext4_write_begin
,
3291 .write_end
= ext4_writeback_write_end
,
3293 .invalidatepage
= ext4_invalidatepage
,
3294 .releasepage
= ext4_releasepage
,
3295 .direct_IO
= ext4_direct_IO
,
3296 .migratepage
= buffer_migrate_page
,
3297 .is_partially_uptodate
= block_is_partially_uptodate
,
3298 .error_remove_page
= generic_error_remove_page
,
3301 static const struct address_space_operations ext4_journalled_aops
= {
3302 .readpage
= ext4_readpage
,
3303 .readpages
= ext4_readpages
,
3304 .writepage
= ext4_writepage
,
3305 .write_begin
= ext4_write_begin
,
3306 .write_end
= ext4_journalled_write_end
,
3307 .set_page_dirty
= ext4_journalled_set_page_dirty
,
3309 .invalidatepage
= ext4_journalled_invalidatepage
,
3310 .releasepage
= ext4_releasepage
,
3311 .direct_IO
= ext4_direct_IO
,
3312 .is_partially_uptodate
= block_is_partially_uptodate
,
3313 .error_remove_page
= generic_error_remove_page
,
3316 static const struct address_space_operations ext4_da_aops
= {
3317 .readpage
= ext4_readpage
,
3318 .readpages
= ext4_readpages
,
3319 .writepage
= ext4_writepage
,
3320 .writepages
= ext4_da_writepages
,
3321 .write_begin
= ext4_da_write_begin
,
3322 .write_end
= ext4_da_write_end
,
3324 .invalidatepage
= ext4_da_invalidatepage
,
3325 .releasepage
= ext4_releasepage
,
3326 .direct_IO
= ext4_direct_IO
,
3327 .migratepage
= buffer_migrate_page
,
3328 .is_partially_uptodate
= block_is_partially_uptodate
,
3329 .error_remove_page
= generic_error_remove_page
,
3332 void ext4_set_aops(struct inode
*inode
)
3334 switch (ext4_inode_journal_mode(inode
)) {
3335 case EXT4_INODE_ORDERED_DATA_MODE
:
3336 if (test_opt(inode
->i_sb
, DELALLOC
))
3337 inode
->i_mapping
->a_ops
= &ext4_da_aops
;
3339 inode
->i_mapping
->a_ops
= &ext4_ordered_aops
;
3341 case EXT4_INODE_WRITEBACK_DATA_MODE
:
3342 if (test_opt(inode
->i_sb
, DELALLOC
))
3343 inode
->i_mapping
->a_ops
= &ext4_da_aops
;
3345 inode
->i_mapping
->a_ops
= &ext4_writeback_aops
;
3347 case EXT4_INODE_JOURNAL_DATA_MODE
:
3348 inode
->i_mapping
->a_ops
= &ext4_journalled_aops
;
3357 * ext4_discard_partial_page_buffers()
3358 * Wrapper function for ext4_discard_partial_page_buffers_no_lock.
3359 * This function finds and locks the page containing the offset
3360 * "from" and passes it to ext4_discard_partial_page_buffers_no_lock.
3361 * Calling functions that already have the page locked should call
3362 * ext4_discard_partial_page_buffers_no_lock directly.
3364 int ext4_discard_partial_page_buffers(handle_t
*handle
,
3365 struct address_space
*mapping
, loff_t from
,
3366 loff_t length
, int flags
)
3368 struct inode
*inode
= mapping
->host
;
3372 page
= find_or_create_page(mapping
, from
>> PAGE_CACHE_SHIFT
,
3373 mapping_gfp_mask(mapping
) & ~__GFP_FS
);
3377 err
= ext4_discard_partial_page_buffers_no_lock(handle
, inode
, page
,
3378 from
, length
, flags
);
3381 page_cache_release(page
);
3386 * ext4_discard_partial_page_buffers_no_lock()
3387 * Zeros a page range of length 'length' starting from offset 'from'.
3388 * Buffer heads that correspond to the block aligned regions of the
3389 * zeroed range will be unmapped. Unblock aligned regions
3390 * will have the corresponding buffer head mapped if needed so that
3391 * that region of the page can be updated with the partial zero out.
3393 * This function assumes that the page has already been locked. The
3394 * The range to be discarded must be contained with in the given page.
3395 * If the specified range exceeds the end of the page it will be shortened
3396 * to the end of the page that corresponds to 'from'. This function is
3397 * appropriate for updating a page and it buffer heads to be unmapped and
3398 * zeroed for blocks that have been either released, or are going to be
3401 * handle: The journal handle
3402 * inode: The files inode
3403 * page: A locked page that contains the offset "from"
3404 * from: The starting byte offset (from the beginning of the file)
3405 * to begin discarding
3406 * len: The length of bytes to discard
3407 * flags: Optional flags that may be used:
3409 * EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED
3410 * Only zero the regions of the page whose buffer heads
3411 * have already been unmapped. This flag is appropriate
3412 * for updating the contents of a page whose blocks may
3413 * have already been released, and we only want to zero
3414 * out the regions that correspond to those released blocks.
3416 * Returns zero on success or negative on failure.
3418 static int ext4_discard_partial_page_buffers_no_lock(handle_t
*handle
,
3419 struct inode
*inode
, struct page
*page
, loff_t from
,
3420 loff_t length
, int flags
)
3422 ext4_fsblk_t index
= from
>> PAGE_CACHE_SHIFT
;
3423 unsigned int offset
= from
& (PAGE_CACHE_SIZE
-1);
3424 unsigned int blocksize
, max
, pos
;
3426 struct buffer_head
*bh
;
3429 blocksize
= inode
->i_sb
->s_blocksize
;
3430 max
= PAGE_CACHE_SIZE
- offset
;
3432 if (index
!= page
->index
)
3436 * correct length if it does not fall between
3437 * 'from' and the end of the page
3439 if (length
> max
|| length
< 0)
3442 iblock
= index
<< (PAGE_CACHE_SHIFT
- inode
->i_sb
->s_blocksize_bits
);
3444 if (!page_has_buffers(page
))
3445 create_empty_buffers(page
, blocksize
, 0);
3447 /* Find the buffer that contains "offset" */
3448 bh
= page_buffers(page
);
3450 while (offset
>= pos
) {
3451 bh
= bh
->b_this_page
;
3457 while (pos
< offset
+ length
) {
3458 unsigned int end_of_block
, range_to_discard
;
3462 /* The length of space left to zero and unmap */
3463 range_to_discard
= offset
+ length
- pos
;
3465 /* The length of space until the end of the block */
3466 end_of_block
= blocksize
- (pos
& (blocksize
-1));
3469 * Do not unmap or zero past end of block
3470 * for this buffer head
3472 if (range_to_discard
> end_of_block
)
3473 range_to_discard
= end_of_block
;
3477 * Skip this buffer head if we are only zeroing unampped
3478 * regions of the page
3480 if (flags
& EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED
&&
3484 /* If the range is block aligned, unmap */
3485 if (range_to_discard
== blocksize
) {
3486 clear_buffer_dirty(bh
);
3488 clear_buffer_mapped(bh
);
3489 clear_buffer_req(bh
);
3490 clear_buffer_new(bh
);
3491 clear_buffer_delay(bh
);
3492 clear_buffer_unwritten(bh
);
3493 clear_buffer_uptodate(bh
);
3494 zero_user(page
, pos
, range_to_discard
);
3495 BUFFER_TRACE(bh
, "Buffer discarded");
3500 * If this block is not completely contained in the range
3501 * to be discarded, then it is not going to be released. Because
3502 * we need to keep this block, we need to make sure this part
3503 * of the page is uptodate before we modify it by writeing
3504 * partial zeros on it.
3506 if (!buffer_mapped(bh
)) {
3508 * Buffer head must be mapped before we can read
3511 BUFFER_TRACE(bh
, "unmapped");
3512 ext4_get_block(inode
, iblock
, bh
, 0);
3513 /* unmapped? It's a hole - nothing to do */
3514 if (!buffer_mapped(bh
)) {
3515 BUFFER_TRACE(bh
, "still unmapped");
3520 /* Ok, it's mapped. Make sure it's up-to-date */
3521 if (PageUptodate(page
))
3522 set_buffer_uptodate(bh
);
3524 if (!buffer_uptodate(bh
)) {
3526 ll_rw_block(READ
, 1, &bh
);
3528 /* Uhhuh. Read error. Complain and punt.*/
3529 if (!buffer_uptodate(bh
))
3533 if (ext4_should_journal_data(inode
)) {
3534 BUFFER_TRACE(bh
, "get write access");
3535 err
= ext4_journal_get_write_access(handle
, bh
);
3540 zero_user(page
, pos
, range_to_discard
);
3543 if (ext4_should_journal_data(inode
)) {
3544 err
= ext4_handle_dirty_metadata(handle
, inode
, bh
);
3546 mark_buffer_dirty(bh
);
3548 BUFFER_TRACE(bh
, "Partial buffer zeroed");
3550 bh
= bh
->b_this_page
;
3552 pos
+= range_to_discard
;
3558 int ext4_can_truncate(struct inode
*inode
)
3560 if (S_ISREG(inode
->i_mode
))
3562 if (S_ISDIR(inode
->i_mode
))
3564 if (S_ISLNK(inode
->i_mode
))
3565 return !ext4_inode_is_fast_symlink(inode
);
3570 * ext4_punch_hole: punches a hole in a file by releaseing the blocks
3571 * associated with the given offset and length
3573 * @inode: File inode
3574 * @offset: The offset where the hole will begin
3575 * @len: The length of the hole
3577 * Returns: 0 on success or negative on failure
3580 int ext4_punch_hole(struct file
*file
, loff_t offset
, loff_t length
)
3582 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
3583 if (!S_ISREG(inode
->i_mode
))
3586 if (!ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))
3587 return ext4_ind_punch_hole(file
, offset
, length
);
3589 if (EXT4_SB(inode
->i_sb
)->s_cluster_ratio
> 1) {
3590 /* TODO: Add support for bigalloc file systems */
3594 trace_ext4_punch_hole(inode
, offset
, length
);
3596 return ext4_ext_punch_hole(file
, offset
, length
);
3602 * We block out ext4_get_block() block instantiations across the entire
3603 * transaction, and VFS/VM ensures that ext4_truncate() cannot run
3604 * simultaneously on behalf of the same inode.
3606 * As we work through the truncate and commit bits of it to the journal there
3607 * is one core, guiding principle: the file's tree must always be consistent on
3608 * disk. We must be able to restart the truncate after a crash.
3610 * The file's tree may be transiently inconsistent in memory (although it
3611 * probably isn't), but whenever we close off and commit a journal transaction,
3612 * the contents of (the filesystem + the journal) must be consistent and
3613 * restartable. It's pretty simple, really: bottom up, right to left (although
3614 * left-to-right works OK too).
3616 * Note that at recovery time, journal replay occurs *before* the restart of
3617 * truncate against the orphan inode list.
3619 * The committed inode has the new, desired i_size (which is the same as
3620 * i_disksize in this case). After a crash, ext4_orphan_cleanup() will see
3621 * that this inode's truncate did not complete and it will again call
3622 * ext4_truncate() to have another go. So there will be instantiated blocks
3623 * to the right of the truncation point in a crashed ext4 filesystem. But
3624 * that's fine - as long as they are linked from the inode, the post-crash
3625 * ext4_truncate() run will find them and release them.
3627 void ext4_truncate(struct inode
*inode
)
3629 trace_ext4_truncate_enter(inode
);
3631 if (!ext4_can_truncate(inode
))
3634 ext4_clear_inode_flag(inode
, EXT4_INODE_EOFBLOCKS
);
3636 if (inode
->i_size
== 0 && !test_opt(inode
->i_sb
, NO_AUTO_DA_ALLOC
))
3637 ext4_set_inode_state(inode
, EXT4_STATE_DA_ALLOC_CLOSE
);
3639 if (ext4_has_inline_data(inode
)) {
3642 ext4_inline_data_truncate(inode
, &has_inline
);
3647 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))
3648 ext4_ext_truncate(inode
);
3650 ext4_ind_truncate(inode
);
3652 trace_ext4_truncate_exit(inode
);
3656 * ext4_get_inode_loc returns with an extra refcount against the inode's
3657 * underlying buffer_head on success. If 'in_mem' is true, we have all
3658 * data in memory that is needed to recreate the on-disk version of this
3661 static int __ext4_get_inode_loc(struct inode
*inode
,
3662 struct ext4_iloc
*iloc
, int in_mem
)
3664 struct ext4_group_desc
*gdp
;
3665 struct buffer_head
*bh
;
3666 struct super_block
*sb
= inode
->i_sb
;
3668 int inodes_per_block
, inode_offset
;
3671 if (!ext4_valid_inum(sb
, inode
->i_ino
))
3674 iloc
->block_group
= (inode
->i_ino
- 1) / EXT4_INODES_PER_GROUP(sb
);
3675 gdp
= ext4_get_group_desc(sb
, iloc
->block_group
, NULL
);
3680 * Figure out the offset within the block group inode table
3682 inodes_per_block
= EXT4_SB(sb
)->s_inodes_per_block
;
3683 inode_offset
= ((inode
->i_ino
- 1) %
3684 EXT4_INODES_PER_GROUP(sb
));
3685 block
= ext4_inode_table(sb
, gdp
) + (inode_offset
/ inodes_per_block
);
3686 iloc
->offset
= (inode_offset
% inodes_per_block
) * EXT4_INODE_SIZE(sb
);
3688 bh
= sb_getblk(sb
, block
);
3691 if (!buffer_uptodate(bh
)) {
3695 * If the buffer has the write error flag, we have failed
3696 * to write out another inode in the same block. In this
3697 * case, we don't have to read the block because we may
3698 * read the old inode data successfully.
3700 if (buffer_write_io_error(bh
) && !buffer_uptodate(bh
))
3701 set_buffer_uptodate(bh
);
3703 if (buffer_uptodate(bh
)) {
3704 /* someone brought it uptodate while we waited */
3710 * If we have all information of the inode in memory and this
3711 * is the only valid inode in the block, we need not read the
3715 struct buffer_head
*bitmap_bh
;
3718 start
= inode_offset
& ~(inodes_per_block
- 1);
3720 /* Is the inode bitmap in cache? */
3721 bitmap_bh
= sb_getblk(sb
, ext4_inode_bitmap(sb
, gdp
));
3722 if (unlikely(!bitmap_bh
))
3726 * If the inode bitmap isn't in cache then the
3727 * optimisation may end up performing two reads instead
3728 * of one, so skip it.
3730 if (!buffer_uptodate(bitmap_bh
)) {
3734 for (i
= start
; i
< start
+ inodes_per_block
; i
++) {
3735 if (i
== inode_offset
)
3737 if (ext4_test_bit(i
, bitmap_bh
->b_data
))
3741 if (i
== start
+ inodes_per_block
) {
3742 /* all other inodes are free, so skip I/O */
3743 memset(bh
->b_data
, 0, bh
->b_size
);
3744 set_buffer_uptodate(bh
);
3752 * If we need to do any I/O, try to pre-readahead extra
3753 * blocks from the inode table.
3755 if (EXT4_SB(sb
)->s_inode_readahead_blks
) {
3756 ext4_fsblk_t b
, end
, table
;
3759 table
= ext4_inode_table(sb
, gdp
);
3760 /* s_inode_readahead_blks is always a power of 2 */
3761 b
= block
& ~(EXT4_SB(sb
)->s_inode_readahead_blks
-1);
3764 end
= b
+ EXT4_SB(sb
)->s_inode_readahead_blks
;
3765 num
= EXT4_INODES_PER_GROUP(sb
);
3766 if (ext4_has_group_desc_csum(sb
))
3767 num
-= ext4_itable_unused_count(sb
, gdp
);
3768 table
+= num
/ inodes_per_block
;
3772 sb_breadahead(sb
, b
++);
3776 * There are other valid inodes in the buffer, this inode
3777 * has in-inode xattrs, or we don't have this inode in memory.
3778 * Read the block from disk.
3780 trace_ext4_load_inode(inode
);
3782 bh
->b_end_io
= end_buffer_read_sync
;
3783 submit_bh(READ
| REQ_META
| REQ_PRIO
, bh
);
3785 if (!buffer_uptodate(bh
)) {
3786 EXT4_ERROR_INODE_BLOCK(inode
, block
,
3787 "unable to read itable block");
3797 int ext4_get_inode_loc(struct inode
*inode
, struct ext4_iloc
*iloc
)
3799 /* We have all inode data except xattrs in memory here. */
3800 return __ext4_get_inode_loc(inode
, iloc
,
3801 !ext4_test_inode_state(inode
, EXT4_STATE_XATTR
));
3804 void ext4_set_inode_flags(struct inode
*inode
)
3806 unsigned int flags
= EXT4_I(inode
)->i_flags
;
3808 inode
->i_flags
&= ~(S_SYNC
|S_APPEND
|S_IMMUTABLE
|S_NOATIME
|S_DIRSYNC
);
3809 if (flags
& EXT4_SYNC_FL
)
3810 inode
->i_flags
|= S_SYNC
;
3811 if (flags
& EXT4_APPEND_FL
)
3812 inode
->i_flags
|= S_APPEND
;
3813 if (flags
& EXT4_IMMUTABLE_FL
)
3814 inode
->i_flags
|= S_IMMUTABLE
;
3815 if (flags
& EXT4_NOATIME_FL
)
3816 inode
->i_flags
|= S_NOATIME
;
3817 if (flags
& EXT4_DIRSYNC_FL
)
3818 inode
->i_flags
|= S_DIRSYNC
;
3821 /* Propagate flags from i_flags to EXT4_I(inode)->i_flags */
3822 void ext4_get_inode_flags(struct ext4_inode_info
*ei
)
3824 unsigned int vfs_fl
;
3825 unsigned long old_fl
, new_fl
;
3828 vfs_fl
= ei
->vfs_inode
.i_flags
;
3829 old_fl
= ei
->i_flags
;
3830 new_fl
= old_fl
& ~(EXT4_SYNC_FL
|EXT4_APPEND_FL
|
3831 EXT4_IMMUTABLE_FL
|EXT4_NOATIME_FL
|
3833 if (vfs_fl
& S_SYNC
)
3834 new_fl
|= EXT4_SYNC_FL
;
3835 if (vfs_fl
& S_APPEND
)
3836 new_fl
|= EXT4_APPEND_FL
;
3837 if (vfs_fl
& S_IMMUTABLE
)
3838 new_fl
|= EXT4_IMMUTABLE_FL
;
3839 if (vfs_fl
& S_NOATIME
)
3840 new_fl
|= EXT4_NOATIME_FL
;
3841 if (vfs_fl
& S_DIRSYNC
)
3842 new_fl
|= EXT4_DIRSYNC_FL
;
3843 } while (cmpxchg(&ei
->i_flags
, old_fl
, new_fl
) != old_fl
);
3846 static blkcnt_t
ext4_inode_blocks(struct ext4_inode
*raw_inode
,
3847 struct ext4_inode_info
*ei
)
3850 struct inode
*inode
= &(ei
->vfs_inode
);
3851 struct super_block
*sb
= inode
->i_sb
;
3853 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3854 EXT4_FEATURE_RO_COMPAT_HUGE_FILE
)) {
3855 /* we are using combined 48 bit field */
3856 i_blocks
= ((u64
)le16_to_cpu(raw_inode
->i_blocks_high
)) << 32 |
3857 le32_to_cpu(raw_inode
->i_blocks_lo
);
3858 if (ext4_test_inode_flag(inode
, EXT4_INODE_HUGE_FILE
)) {
3859 /* i_blocks represent file system block size */
3860 return i_blocks
<< (inode
->i_blkbits
- 9);
3865 return le32_to_cpu(raw_inode
->i_blocks_lo
);
3869 static inline void ext4_iget_extra_inode(struct inode
*inode
,
3870 struct ext4_inode
*raw_inode
,
3871 struct ext4_inode_info
*ei
)
3873 __le32
*magic
= (void *)raw_inode
+
3874 EXT4_GOOD_OLD_INODE_SIZE
+ ei
->i_extra_isize
;
3875 if (*magic
== cpu_to_le32(EXT4_XATTR_MAGIC
)) {
3876 ext4_set_inode_state(inode
, EXT4_STATE_XATTR
);
3877 ext4_find_inline_data_nolock(inode
);
3879 EXT4_I(inode
)->i_inline_off
= 0;
3882 struct inode
*ext4_iget(struct super_block
*sb
, unsigned long ino
)
3884 struct ext4_iloc iloc
;
3885 struct ext4_inode
*raw_inode
;
3886 struct ext4_inode_info
*ei
;
3887 struct inode
*inode
;
3888 journal_t
*journal
= EXT4_SB(sb
)->s_journal
;
3894 inode
= iget_locked(sb
, ino
);
3896 return ERR_PTR(-ENOMEM
);
3897 if (!(inode
->i_state
& I_NEW
))
3903 ret
= __ext4_get_inode_loc(inode
, &iloc
, 0);
3906 raw_inode
= ext4_raw_inode(&iloc
);
3908 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
) {
3909 ei
->i_extra_isize
= le16_to_cpu(raw_inode
->i_extra_isize
);
3910 if (EXT4_GOOD_OLD_INODE_SIZE
+ ei
->i_extra_isize
>
3911 EXT4_INODE_SIZE(inode
->i_sb
)) {
3912 EXT4_ERROR_INODE(inode
, "bad extra_isize (%u != %u)",
3913 EXT4_GOOD_OLD_INODE_SIZE
+ ei
->i_extra_isize
,
3914 EXT4_INODE_SIZE(inode
->i_sb
));
3919 ei
->i_extra_isize
= 0;
3921 /* Precompute checksum seed for inode metadata */
3922 if (EXT4_HAS_RO_COMPAT_FEATURE(sb
,
3923 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
)) {
3924 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
3926 __le32 inum
= cpu_to_le32(inode
->i_ino
);
3927 __le32 gen
= raw_inode
->i_generation
;
3928 csum
= ext4_chksum(sbi
, sbi
->s_csum_seed
, (__u8
*)&inum
,
3930 ei
->i_csum_seed
= ext4_chksum(sbi
, csum
, (__u8
*)&gen
,
3934 if (!ext4_inode_csum_verify(inode
, raw_inode
, ei
)) {
3935 EXT4_ERROR_INODE(inode
, "checksum invalid");
3940 inode
->i_mode
= le16_to_cpu(raw_inode
->i_mode
);
3941 i_uid
= (uid_t
)le16_to_cpu(raw_inode
->i_uid_low
);
3942 i_gid
= (gid_t
)le16_to_cpu(raw_inode
->i_gid_low
);
3943 if (!(test_opt(inode
->i_sb
, NO_UID32
))) {
3944 i_uid
|= le16_to_cpu(raw_inode
->i_uid_high
) << 16;
3945 i_gid
|= le16_to_cpu(raw_inode
->i_gid_high
) << 16;
3947 i_uid_write(inode
, i_uid
);
3948 i_gid_write(inode
, i_gid
);
3949 set_nlink(inode
, le16_to_cpu(raw_inode
->i_links_count
));
3951 ext4_clear_state_flags(ei
); /* Only relevant on 32-bit archs */
3952 ei
->i_inline_off
= 0;
3953 ei
->i_dir_start_lookup
= 0;
3954 ei
->i_dtime
= le32_to_cpu(raw_inode
->i_dtime
);
3955 /* We now have enough fields to check if the inode was active or not.
3956 * This is needed because nfsd might try to access dead inodes
3957 * the test is that same one that e2fsck uses
3958 * NeilBrown 1999oct15
3960 if (inode
->i_nlink
== 0) {
3961 if (inode
->i_mode
== 0 ||
3962 !(EXT4_SB(inode
->i_sb
)->s_mount_state
& EXT4_ORPHAN_FS
)) {
3963 /* this inode is deleted */
3967 /* The only unlinked inodes we let through here have
3968 * valid i_mode and are being read by the orphan
3969 * recovery code: that's fine, we're about to complete
3970 * the process of deleting those. */
3972 ei
->i_flags
= le32_to_cpu(raw_inode
->i_flags
);
3973 inode
->i_blocks
= ext4_inode_blocks(raw_inode
, ei
);
3974 ei
->i_file_acl
= le32_to_cpu(raw_inode
->i_file_acl_lo
);
3975 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_64BIT
))
3977 ((__u64
)le16_to_cpu(raw_inode
->i_file_acl_high
)) << 32;
3978 inode
->i_size
= ext4_isize(raw_inode
);
3979 ei
->i_disksize
= inode
->i_size
;
3981 ei
->i_reserved_quota
= 0;
3983 inode
->i_generation
= le32_to_cpu(raw_inode
->i_generation
);
3984 ei
->i_block_group
= iloc
.block_group
;
3985 ei
->i_last_alloc_group
= ~0;
3987 * NOTE! The in-memory inode i_data array is in little-endian order
3988 * even on big-endian machines: we do NOT byteswap the block numbers!
3990 for (block
= 0; block
< EXT4_N_BLOCKS
; block
++)
3991 ei
->i_data
[block
] = raw_inode
->i_block
[block
];
3992 INIT_LIST_HEAD(&ei
->i_orphan
);
3995 * Set transaction id's of transactions that have to be committed
3996 * to finish f[data]sync. We set them to currently running transaction
3997 * as we cannot be sure that the inode or some of its metadata isn't
3998 * part of the transaction - the inode could have been reclaimed and
3999 * now it is reread from disk.
4002 transaction_t
*transaction
;
4005 read_lock(&journal
->j_state_lock
);
4006 if (journal
->j_running_transaction
)
4007 transaction
= journal
->j_running_transaction
;
4009 transaction
= journal
->j_committing_transaction
;
4011 tid
= transaction
->t_tid
;
4013 tid
= journal
->j_commit_sequence
;
4014 read_unlock(&journal
->j_state_lock
);
4015 ei
->i_sync_tid
= tid
;
4016 ei
->i_datasync_tid
= tid
;
4019 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
) {
4020 if (ei
->i_extra_isize
== 0) {
4021 /* The extra space is currently unused. Use it. */
4022 ei
->i_extra_isize
= sizeof(struct ext4_inode
) -
4023 EXT4_GOOD_OLD_INODE_SIZE
;
4025 ext4_iget_extra_inode(inode
, raw_inode
, ei
);
4029 EXT4_INODE_GET_XTIME(i_ctime
, inode
, raw_inode
);
4030 EXT4_INODE_GET_XTIME(i_mtime
, inode
, raw_inode
);
4031 EXT4_INODE_GET_XTIME(i_atime
, inode
, raw_inode
);
4032 EXT4_EINODE_GET_XTIME(i_crtime
, ei
, raw_inode
);
4034 inode
->i_version
= le32_to_cpu(raw_inode
->i_disk_version
);
4035 if (EXT4_INODE_SIZE(inode
->i_sb
) > EXT4_GOOD_OLD_INODE_SIZE
) {
4036 if (EXT4_FITS_IN_INODE(raw_inode
, ei
, i_version_hi
))
4038 (__u64
)(le32_to_cpu(raw_inode
->i_version_hi
)) << 32;
4042 if (ei
->i_file_acl
&&
4043 !ext4_data_block_valid(EXT4_SB(sb
), ei
->i_file_acl
, 1)) {
4044 EXT4_ERROR_INODE(inode
, "bad extended attribute block %llu",
4048 } else if (!ext4_has_inline_data(inode
)) {
4049 if (ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)) {
4050 if ((S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
4051 (S_ISLNK(inode
->i_mode
) &&
4052 !ext4_inode_is_fast_symlink(inode
))))
4053 /* Validate extent which is part of inode */
4054 ret
= ext4_ext_check_inode(inode
);
4055 } else if (S_ISREG(inode
->i_mode
) || S_ISDIR(inode
->i_mode
) ||
4056 (S_ISLNK(inode
->i_mode
) &&
4057 !ext4_inode_is_fast_symlink(inode
))) {
4058 /* Validate block references which are part of inode */
4059 ret
= ext4_ind_check_inode(inode
);
4065 if (S_ISREG(inode
->i_mode
)) {
4066 inode
->i_op
= &ext4_file_inode_operations
;
4067 inode
->i_fop
= &ext4_file_operations
;
4068 ext4_set_aops(inode
);
4069 } else if (S_ISDIR(inode
->i_mode
)) {
4070 inode
->i_op
= &ext4_dir_inode_operations
;
4071 inode
->i_fop
= &ext4_dir_operations
;
4072 } else if (S_ISLNK(inode
->i_mode
)) {
4073 if (ext4_inode_is_fast_symlink(inode
)) {
4074 inode
->i_op
= &ext4_fast_symlink_inode_operations
;
4075 nd_terminate_link(ei
->i_data
, inode
->i_size
,
4076 sizeof(ei
->i_data
) - 1);
4078 inode
->i_op
= &ext4_symlink_inode_operations
;
4079 ext4_set_aops(inode
);
4081 } else if (S_ISCHR(inode
->i_mode
) || S_ISBLK(inode
->i_mode
) ||
4082 S_ISFIFO(inode
->i_mode
) || S_ISSOCK(inode
->i_mode
)) {
4083 inode
->i_op
= &ext4_special_inode_operations
;
4084 if (raw_inode
->i_block
[0])
4085 init_special_inode(inode
, inode
->i_mode
,
4086 old_decode_dev(le32_to_cpu(raw_inode
->i_block
[0])));
4088 init_special_inode(inode
, inode
->i_mode
,
4089 new_decode_dev(le32_to_cpu(raw_inode
->i_block
[1])));
4092 EXT4_ERROR_INODE(inode
, "bogus i_mode (%o)", inode
->i_mode
);
4096 ext4_set_inode_flags(inode
);
4097 unlock_new_inode(inode
);
4103 return ERR_PTR(ret
);
4106 static int ext4_inode_blocks_set(handle_t
*handle
,
4107 struct ext4_inode
*raw_inode
,
4108 struct ext4_inode_info
*ei
)
4110 struct inode
*inode
= &(ei
->vfs_inode
);
4111 u64 i_blocks
= inode
->i_blocks
;
4112 struct super_block
*sb
= inode
->i_sb
;
4114 if (i_blocks
<= ~0U) {
4116 * i_blocks can be represented in a 32 bit variable
4117 * as multiple of 512 bytes
4119 raw_inode
->i_blocks_lo
= cpu_to_le32(i_blocks
);
4120 raw_inode
->i_blocks_high
= 0;
4121 ext4_clear_inode_flag(inode
, EXT4_INODE_HUGE_FILE
);
4124 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
, EXT4_FEATURE_RO_COMPAT_HUGE_FILE
))
4127 if (i_blocks
<= 0xffffffffffffULL
) {
4129 * i_blocks can be represented in a 48 bit variable
4130 * as multiple of 512 bytes
4132 raw_inode
->i_blocks_lo
= cpu_to_le32(i_blocks
);
4133 raw_inode
->i_blocks_high
= cpu_to_le16(i_blocks
>> 32);
4134 ext4_clear_inode_flag(inode
, EXT4_INODE_HUGE_FILE
);
4136 ext4_set_inode_flag(inode
, EXT4_INODE_HUGE_FILE
);
4137 /* i_block is stored in file system block size */
4138 i_blocks
= i_blocks
>> (inode
->i_blkbits
- 9);
4139 raw_inode
->i_blocks_lo
= cpu_to_le32(i_blocks
);
4140 raw_inode
->i_blocks_high
= cpu_to_le16(i_blocks
>> 32);
4146 * Post the struct inode info into an on-disk inode location in the
4147 * buffer-cache. This gobbles the caller's reference to the
4148 * buffer_head in the inode location struct.
4150 * The caller must have write access to iloc->bh.
4152 static int ext4_do_update_inode(handle_t
*handle
,
4153 struct inode
*inode
,
4154 struct ext4_iloc
*iloc
)
4156 struct ext4_inode
*raw_inode
= ext4_raw_inode(iloc
);
4157 struct ext4_inode_info
*ei
= EXT4_I(inode
);
4158 struct buffer_head
*bh
= iloc
->bh
;
4159 int err
= 0, rc
, block
;
4160 int need_datasync
= 0;
4164 /* For fields not not tracking in the in-memory inode,
4165 * initialise them to zero for new inodes. */
4166 if (ext4_test_inode_state(inode
, EXT4_STATE_NEW
))
4167 memset(raw_inode
, 0, EXT4_SB(inode
->i_sb
)->s_inode_size
);
4169 ext4_get_inode_flags(ei
);
4170 raw_inode
->i_mode
= cpu_to_le16(inode
->i_mode
);
4171 i_uid
= i_uid_read(inode
);
4172 i_gid
= i_gid_read(inode
);
4173 if (!(test_opt(inode
->i_sb
, NO_UID32
))) {
4174 raw_inode
->i_uid_low
= cpu_to_le16(low_16_bits(i_uid
));
4175 raw_inode
->i_gid_low
= cpu_to_le16(low_16_bits(i_gid
));
4177 * Fix up interoperability with old kernels. Otherwise, old inodes get
4178 * re-used with the upper 16 bits of the uid/gid intact
4181 raw_inode
->i_uid_high
=
4182 cpu_to_le16(high_16_bits(i_uid
));
4183 raw_inode
->i_gid_high
=
4184 cpu_to_le16(high_16_bits(i_gid
));
4186 raw_inode
->i_uid_high
= 0;
4187 raw_inode
->i_gid_high
= 0;
4190 raw_inode
->i_uid_low
= cpu_to_le16(fs_high2lowuid(i_uid
));
4191 raw_inode
->i_gid_low
= cpu_to_le16(fs_high2lowgid(i_gid
));
4192 raw_inode
->i_uid_high
= 0;
4193 raw_inode
->i_gid_high
= 0;
4195 raw_inode
->i_links_count
= cpu_to_le16(inode
->i_nlink
);
4197 EXT4_INODE_SET_XTIME(i_ctime
, inode
, raw_inode
);
4198 EXT4_INODE_SET_XTIME(i_mtime
, inode
, raw_inode
);
4199 EXT4_INODE_SET_XTIME(i_atime
, inode
, raw_inode
);
4200 EXT4_EINODE_SET_XTIME(i_crtime
, ei
, raw_inode
);
4202 if (ext4_inode_blocks_set(handle
, raw_inode
, ei
))
4204 raw_inode
->i_dtime
= cpu_to_le32(ei
->i_dtime
);
4205 raw_inode
->i_flags
= cpu_to_le32(ei
->i_flags
& 0xFFFFFFFF);
4206 if (EXT4_SB(inode
->i_sb
)->s_es
->s_creator_os
!=
4207 cpu_to_le32(EXT4_OS_HURD
))
4208 raw_inode
->i_file_acl_high
=
4209 cpu_to_le16(ei
->i_file_acl
>> 32);
4210 raw_inode
->i_file_acl_lo
= cpu_to_le32(ei
->i_file_acl
);
4211 if (ei
->i_disksize
!= ext4_isize(raw_inode
)) {
4212 ext4_isize_set(raw_inode
, ei
->i_disksize
);
4215 if (ei
->i_disksize
> 0x7fffffffULL
) {
4216 struct super_block
*sb
= inode
->i_sb
;
4217 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb
,
4218 EXT4_FEATURE_RO_COMPAT_LARGE_FILE
) ||
4219 EXT4_SB(sb
)->s_es
->s_rev_level
==
4220 cpu_to_le32(EXT4_GOOD_OLD_REV
)) {
4221 /* If this is the first large file
4222 * created, add a flag to the superblock.
4224 err
= ext4_journal_get_write_access(handle
,
4225 EXT4_SB(sb
)->s_sbh
);
4228 ext4_update_dynamic_rev(sb
);
4229 EXT4_SET_RO_COMPAT_FEATURE(sb
,
4230 EXT4_FEATURE_RO_COMPAT_LARGE_FILE
);
4231 ext4_handle_sync(handle
);
4232 err
= ext4_handle_dirty_super(handle
, sb
);
4235 raw_inode
->i_generation
= cpu_to_le32(inode
->i_generation
);
4236 if (S_ISCHR(inode
->i_mode
) || S_ISBLK(inode
->i_mode
)) {
4237 if (old_valid_dev(inode
->i_rdev
)) {
4238 raw_inode
->i_block
[0] =
4239 cpu_to_le32(old_encode_dev(inode
->i_rdev
));
4240 raw_inode
->i_block
[1] = 0;
4242 raw_inode
->i_block
[0] = 0;
4243 raw_inode
->i_block
[1] =
4244 cpu_to_le32(new_encode_dev(inode
->i_rdev
));
4245 raw_inode
->i_block
[2] = 0;
4247 } else if (!ext4_has_inline_data(inode
)) {
4248 for (block
= 0; block
< EXT4_N_BLOCKS
; block
++)
4249 raw_inode
->i_block
[block
] = ei
->i_data
[block
];
4252 raw_inode
->i_disk_version
= cpu_to_le32(inode
->i_version
);
4253 if (ei
->i_extra_isize
) {
4254 if (EXT4_FITS_IN_INODE(raw_inode
, ei
, i_version_hi
))
4255 raw_inode
->i_version_hi
=
4256 cpu_to_le32(inode
->i_version
>> 32);
4257 raw_inode
->i_extra_isize
= cpu_to_le16(ei
->i_extra_isize
);
4260 ext4_inode_csum_set(inode
, raw_inode
, ei
);
4262 BUFFER_TRACE(bh
, "call ext4_handle_dirty_metadata");
4263 rc
= ext4_handle_dirty_metadata(handle
, NULL
, bh
);
4266 ext4_clear_inode_state(inode
, EXT4_STATE_NEW
);
4268 ext4_update_inode_fsync_trans(handle
, inode
, need_datasync
);
4271 ext4_std_error(inode
->i_sb
, err
);
4276 * ext4_write_inode()
4278 * We are called from a few places:
4280 * - Within generic_file_write() for O_SYNC files.
4281 * Here, there will be no transaction running. We wait for any running
4282 * transaction to commit.
4284 * - Within sys_sync(), kupdate and such.
4285 * We wait on commit, if tol to.
4287 * - Within prune_icache() (PF_MEMALLOC == true)
4288 * Here we simply return. We can't afford to block kswapd on the
4291 * In all cases it is actually safe for us to return without doing anything,
4292 * because the inode has been copied into a raw inode buffer in
4293 * ext4_mark_inode_dirty(). This is a correctness thing for O_SYNC and for
4296 * Note that we are absolutely dependent upon all inode dirtiers doing the
4297 * right thing: they *must* call mark_inode_dirty() after dirtying info in
4298 * which we are interested.
4300 * It would be a bug for them to not do this. The code:
4302 * mark_inode_dirty(inode)
4304 * inode->i_size = expr;
4306 * is in error because a kswapd-driven write_inode() could occur while
4307 * `stuff()' is running, and the new i_size will be lost. Plus the inode
4308 * will no longer be on the superblock's dirty inode list.
4310 int ext4_write_inode(struct inode
*inode
, struct writeback_control
*wbc
)
4314 if (current
->flags
& PF_MEMALLOC
)
4317 if (EXT4_SB(inode
->i_sb
)->s_journal
) {
4318 if (ext4_journal_current_handle()) {
4319 jbd_debug(1, "called recursively, non-PF_MEMALLOC!\n");
4324 if (wbc
->sync_mode
!= WB_SYNC_ALL
)
4327 err
= ext4_force_commit(inode
->i_sb
);
4329 struct ext4_iloc iloc
;
4331 err
= __ext4_get_inode_loc(inode
, &iloc
, 0);
4334 if (wbc
->sync_mode
== WB_SYNC_ALL
)
4335 sync_dirty_buffer(iloc
.bh
);
4336 if (buffer_req(iloc
.bh
) && !buffer_uptodate(iloc
.bh
)) {
4337 EXT4_ERROR_INODE_BLOCK(inode
, iloc
.bh
->b_blocknr
,
4338 "IO error syncing inode");
4347 * In data=journal mode ext4_journalled_invalidatepage() may fail to invalidate
4348 * buffers that are attached to a page stradding i_size and are undergoing
4349 * commit. In that case we have to wait for commit to finish and try again.
4351 static void ext4_wait_for_tail_page_commit(struct inode
*inode
)
4355 journal_t
*journal
= EXT4_SB(inode
->i_sb
)->s_journal
;
4356 tid_t commit_tid
= 0;
4359 offset
= inode
->i_size
& (PAGE_CACHE_SIZE
- 1);
4361 * All buffers in the last page remain valid? Then there's nothing to
4362 * do. We do the check mainly to optimize the common PAGE_CACHE_SIZE ==
4365 if (offset
> PAGE_CACHE_SIZE
- (1 << inode
->i_blkbits
))
4368 page
= find_lock_page(inode
->i_mapping
,
4369 inode
->i_size
>> PAGE_CACHE_SHIFT
);
4372 ret
= __ext4_journalled_invalidatepage(page
, offset
);
4374 page_cache_release(page
);
4378 read_lock(&journal
->j_state_lock
);
4379 if (journal
->j_committing_transaction
)
4380 commit_tid
= journal
->j_committing_transaction
->t_tid
;
4381 read_unlock(&journal
->j_state_lock
);
4383 jbd2_log_wait_commit(journal
, commit_tid
);
4390 * Called from notify_change.
4392 * We want to trap VFS attempts to truncate the file as soon as
4393 * possible. In particular, we want to make sure that when the VFS
4394 * shrinks i_size, we put the inode on the orphan list and modify
4395 * i_disksize immediately, so that during the subsequent flushing of
4396 * dirty pages and freeing of disk blocks, we can guarantee that any
4397 * commit will leave the blocks being flushed in an unused state on
4398 * disk. (On recovery, the inode will get truncated and the blocks will
4399 * be freed, so we have a strong guarantee that no future commit will
4400 * leave these blocks visible to the user.)
4402 * Another thing we have to assure is that if we are in ordered mode
4403 * and inode is still attached to the committing transaction, we must
4404 * we start writeout of all the dirty pages which are being truncated.
4405 * This way we are sure that all the data written in the previous
4406 * transaction are already on disk (truncate waits for pages under
4409 * Called with inode->i_mutex down.
4411 int ext4_setattr(struct dentry
*dentry
, struct iattr
*attr
)
4413 struct inode
*inode
= dentry
->d_inode
;
4416 const unsigned int ia_valid
= attr
->ia_valid
;
4418 error
= inode_change_ok(inode
, attr
);
4422 if (is_quota_modification(inode
, attr
))
4423 dquot_initialize(inode
);
4424 if ((ia_valid
& ATTR_UID
&& !uid_eq(attr
->ia_uid
, inode
->i_uid
)) ||
4425 (ia_valid
& ATTR_GID
&& !gid_eq(attr
->ia_gid
, inode
->i_gid
))) {
4428 /* (user+group)*(old+new) structure, inode write (sb,
4429 * inode block, ? - but truncate inode update has it) */
4430 handle
= ext4_journal_start(inode
, EXT4_HT_QUOTA
,
4431 (EXT4_MAXQUOTAS_INIT_BLOCKS(inode
->i_sb
) +
4432 EXT4_MAXQUOTAS_DEL_BLOCKS(inode
->i_sb
)) + 3);
4433 if (IS_ERR(handle
)) {
4434 error
= PTR_ERR(handle
);
4437 error
= dquot_transfer(inode
, attr
);
4439 ext4_journal_stop(handle
);
4442 /* Update corresponding info in inode so that everything is in
4443 * one transaction */
4444 if (attr
->ia_valid
& ATTR_UID
)
4445 inode
->i_uid
= attr
->ia_uid
;
4446 if (attr
->ia_valid
& ATTR_GID
)
4447 inode
->i_gid
= attr
->ia_gid
;
4448 error
= ext4_mark_inode_dirty(handle
, inode
);
4449 ext4_journal_stop(handle
);
4452 if (attr
->ia_valid
& ATTR_SIZE
) {
4454 if (!(ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
))) {
4455 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
4457 if (attr
->ia_size
> sbi
->s_bitmap_maxbytes
)
4462 if (S_ISREG(inode
->i_mode
) &&
4463 attr
->ia_valid
& ATTR_SIZE
&&
4464 (attr
->ia_size
< inode
->i_size
)) {
4467 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 3);
4468 if (IS_ERR(handle
)) {
4469 error
= PTR_ERR(handle
);
4472 if (ext4_handle_valid(handle
)) {
4473 error
= ext4_orphan_add(handle
, inode
);
4476 EXT4_I(inode
)->i_disksize
= attr
->ia_size
;
4477 rc
= ext4_mark_inode_dirty(handle
, inode
);
4480 ext4_journal_stop(handle
);
4482 if (ext4_should_order_data(inode
)) {
4483 error
= ext4_begin_ordered_truncate(inode
,
4486 /* Do as much error cleanup as possible */
4487 handle
= ext4_journal_start(inode
,
4489 if (IS_ERR(handle
)) {
4490 ext4_orphan_del(NULL
, inode
);
4493 ext4_orphan_del(handle
, inode
);
4495 ext4_journal_stop(handle
);
4501 if (attr
->ia_valid
& ATTR_SIZE
) {
4502 if (attr
->ia_size
!= inode
->i_size
) {
4503 loff_t oldsize
= inode
->i_size
;
4505 i_size_write(inode
, attr
->ia_size
);
4507 * Blocks are going to be removed from the inode. Wait
4508 * for dio in flight. Temporarily disable
4509 * dioread_nolock to prevent livelock.
4512 if (!ext4_should_journal_data(inode
)) {
4513 ext4_inode_block_unlocked_dio(inode
);
4514 inode_dio_wait(inode
);
4515 ext4_inode_resume_unlocked_dio(inode
);
4517 ext4_wait_for_tail_page_commit(inode
);
4520 * Truncate pagecache after we've waited for commit
4521 * in data=journal mode to make pages freeable.
4523 truncate_pagecache(inode
, oldsize
, inode
->i_size
);
4525 ext4_truncate(inode
);
4529 setattr_copy(inode
, attr
);
4530 mark_inode_dirty(inode
);
4534 * If the call to ext4_truncate failed to get a transaction handle at
4535 * all, we need to clean up the in-core orphan list manually.
4537 if (orphan
&& inode
->i_nlink
)
4538 ext4_orphan_del(NULL
, inode
);
4540 if (!rc
&& (ia_valid
& ATTR_MODE
))
4541 rc
= ext4_acl_chmod(inode
);
4544 ext4_std_error(inode
->i_sb
, error
);
4550 int ext4_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
,
4553 struct inode
*inode
;
4554 unsigned long delalloc_blocks
;
4556 inode
= dentry
->d_inode
;
4557 generic_fillattr(inode
, stat
);
4560 * We can't update i_blocks if the block allocation is delayed
4561 * otherwise in the case of system crash before the real block
4562 * allocation is done, we will have i_blocks inconsistent with
4563 * on-disk file blocks.
4564 * We always keep i_blocks updated together with real
4565 * allocation. But to not confuse with user, stat
4566 * will return the blocks that include the delayed allocation
4567 * blocks for this file.
4569 delalloc_blocks
= EXT4_C2B(EXT4_SB(inode
->i_sb
),
4570 EXT4_I(inode
)->i_reserved_data_blocks
);
4572 stat
->blocks
+= (delalloc_blocks
<< inode
->i_sb
->s_blocksize_bits
)>>9;
4576 static int ext4_index_trans_blocks(struct inode
*inode
, int nrblocks
, int chunk
)
4578 if (!(ext4_test_inode_flag(inode
, EXT4_INODE_EXTENTS
)))
4579 return ext4_ind_trans_blocks(inode
, nrblocks
, chunk
);
4580 return ext4_ext_index_trans_blocks(inode
, nrblocks
, chunk
);
4584 * Account for index blocks, block groups bitmaps and block group
4585 * descriptor blocks if modify datablocks and index blocks
4586 * worse case, the indexs blocks spread over different block groups
4588 * If datablocks are discontiguous, they are possible to spread over
4589 * different block groups too. If they are contiguous, with flexbg,
4590 * they could still across block group boundary.
4592 * Also account for superblock, inode, quota and xattr blocks
4594 static int ext4_meta_trans_blocks(struct inode
*inode
, int nrblocks
, int chunk
)
4596 ext4_group_t groups
, ngroups
= ext4_get_groups_count(inode
->i_sb
);
4602 * How many index blocks need to touch to modify nrblocks?
4603 * The "Chunk" flag indicating whether the nrblocks is
4604 * physically contiguous on disk
4606 * For Direct IO and fallocate, they calls get_block to allocate
4607 * one single extent at a time, so they could set the "Chunk" flag
4609 idxblocks
= ext4_index_trans_blocks(inode
, nrblocks
, chunk
);
4614 * Now let's see how many group bitmaps and group descriptors need
4624 if (groups
> ngroups
)
4626 if (groups
> EXT4_SB(inode
->i_sb
)->s_gdb_count
)
4627 gdpblocks
= EXT4_SB(inode
->i_sb
)->s_gdb_count
;
4629 /* bitmaps and block group descriptor blocks */
4630 ret
+= groups
+ gdpblocks
;
4632 /* Blocks for super block, inode, quota and xattr blocks */
4633 ret
+= EXT4_META_TRANS_BLOCKS(inode
->i_sb
);
4639 * Calculate the total number of credits to reserve to fit
4640 * the modification of a single pages into a single transaction,
4641 * which may include multiple chunks of block allocations.
4643 * This could be called via ext4_write_begin()
4645 * We need to consider the worse case, when
4646 * one new block per extent.
4648 int ext4_writepage_trans_blocks(struct inode
*inode
)
4650 int bpp
= ext4_journal_blocks_per_page(inode
);
4653 ret
= ext4_meta_trans_blocks(inode
, bpp
, 0);
4655 /* Account for data blocks for journalled mode */
4656 if (ext4_should_journal_data(inode
))
4662 * Calculate the journal credits for a chunk of data modification.
4664 * This is called from DIO, fallocate or whoever calling
4665 * ext4_map_blocks() to map/allocate a chunk of contiguous disk blocks.
4667 * journal buffers for data blocks are not included here, as DIO
4668 * and fallocate do no need to journal data buffers.
4670 int ext4_chunk_trans_blocks(struct inode
*inode
, int nrblocks
)
4672 return ext4_meta_trans_blocks(inode
, nrblocks
, 1);
4676 * The caller must have previously called ext4_reserve_inode_write().
4677 * Give this, we know that the caller already has write access to iloc->bh.
4679 int ext4_mark_iloc_dirty(handle_t
*handle
,
4680 struct inode
*inode
, struct ext4_iloc
*iloc
)
4684 if (IS_I_VERSION(inode
))
4685 inode_inc_iversion(inode
);
4687 /* the do_update_inode consumes one bh->b_count */
4690 /* ext4_do_update_inode() does jbd2_journal_dirty_metadata */
4691 err
= ext4_do_update_inode(handle
, inode
, iloc
);
4697 * On success, We end up with an outstanding reference count against
4698 * iloc->bh. This _must_ be cleaned up later.
4702 ext4_reserve_inode_write(handle_t
*handle
, struct inode
*inode
,
4703 struct ext4_iloc
*iloc
)
4707 err
= ext4_get_inode_loc(inode
, iloc
);
4709 BUFFER_TRACE(iloc
->bh
, "get_write_access");
4710 err
= ext4_journal_get_write_access(handle
, iloc
->bh
);
4716 ext4_std_error(inode
->i_sb
, err
);
4721 * Expand an inode by new_extra_isize bytes.
4722 * Returns 0 on success or negative error number on failure.
4724 static int ext4_expand_extra_isize(struct inode
*inode
,
4725 unsigned int new_extra_isize
,
4726 struct ext4_iloc iloc
,
4729 struct ext4_inode
*raw_inode
;
4730 struct ext4_xattr_ibody_header
*header
;
4732 if (EXT4_I(inode
)->i_extra_isize
>= new_extra_isize
)
4735 raw_inode
= ext4_raw_inode(&iloc
);
4737 header
= IHDR(inode
, raw_inode
);
4739 /* No extended attributes present */
4740 if (!ext4_test_inode_state(inode
, EXT4_STATE_XATTR
) ||
4741 header
->h_magic
!= cpu_to_le32(EXT4_XATTR_MAGIC
)) {
4742 memset((void *)raw_inode
+ EXT4_GOOD_OLD_INODE_SIZE
, 0,
4744 EXT4_I(inode
)->i_extra_isize
= new_extra_isize
;
4748 /* try to expand with EAs present */
4749 return ext4_expand_extra_isize_ea(inode
, new_extra_isize
,
4754 * What we do here is to mark the in-core inode as clean with respect to inode
4755 * dirtiness (it may still be data-dirty).
4756 * This means that the in-core inode may be reaped by prune_icache
4757 * without having to perform any I/O. This is a very good thing,
4758 * because *any* task may call prune_icache - even ones which
4759 * have a transaction open against a different journal.
4761 * Is this cheating? Not really. Sure, we haven't written the
4762 * inode out, but prune_icache isn't a user-visible syncing function.
4763 * Whenever the user wants stuff synced (sys_sync, sys_msync, sys_fsync)
4764 * we start and wait on commits.
4766 int ext4_mark_inode_dirty(handle_t
*handle
, struct inode
*inode
)
4768 struct ext4_iloc iloc
;
4769 struct ext4_sb_info
*sbi
= EXT4_SB(inode
->i_sb
);
4770 static unsigned int mnt_count
;
4774 trace_ext4_mark_inode_dirty(inode
, _RET_IP_
);
4775 err
= ext4_reserve_inode_write(handle
, inode
, &iloc
);
4776 if (ext4_handle_valid(handle
) &&
4777 EXT4_I(inode
)->i_extra_isize
< sbi
->s_want_extra_isize
&&
4778 !ext4_test_inode_state(inode
, EXT4_STATE_NO_EXPAND
)) {
4780 * We need extra buffer credits since we may write into EA block
4781 * with this same handle. If journal_extend fails, then it will
4782 * only result in a minor loss of functionality for that inode.
4783 * If this is felt to be critical, then e2fsck should be run to
4784 * force a large enough s_min_extra_isize.
4786 if ((jbd2_journal_extend(handle
,
4787 EXT4_DATA_TRANS_BLOCKS(inode
->i_sb
))) == 0) {
4788 ret
= ext4_expand_extra_isize(inode
,
4789 sbi
->s_want_extra_isize
,
4792 ext4_set_inode_state(inode
,
4793 EXT4_STATE_NO_EXPAND
);
4795 le16_to_cpu(sbi
->s_es
->s_mnt_count
)) {
4796 ext4_warning(inode
->i_sb
,
4797 "Unable to expand inode %lu. Delete"
4798 " some EAs or run e2fsck.",
4801 le16_to_cpu(sbi
->s_es
->s_mnt_count
);
4807 err
= ext4_mark_iloc_dirty(handle
, inode
, &iloc
);
4812 * ext4_dirty_inode() is called from __mark_inode_dirty()
4814 * We're really interested in the case where a file is being extended.
4815 * i_size has been changed by generic_commit_write() and we thus need
4816 * to include the updated inode in the current transaction.
4818 * Also, dquot_alloc_block() will always dirty the inode when blocks
4819 * are allocated to the file.
4821 * If the inode is marked synchronous, we don't honour that here - doing
4822 * so would cause a commit on atime updates, which we don't bother doing.
4823 * We handle synchronous inodes at the highest possible level.
4825 void ext4_dirty_inode(struct inode
*inode
, int flags
)
4829 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 2);
4833 ext4_mark_inode_dirty(handle
, inode
);
4835 ext4_journal_stop(handle
);
4842 * Bind an inode's backing buffer_head into this transaction, to prevent
4843 * it from being flushed to disk early. Unlike
4844 * ext4_reserve_inode_write, this leaves behind no bh reference and
4845 * returns no iloc structure, so the caller needs to repeat the iloc
4846 * lookup to mark the inode dirty later.
4848 static int ext4_pin_inode(handle_t
*handle
, struct inode
*inode
)
4850 struct ext4_iloc iloc
;
4854 err
= ext4_get_inode_loc(inode
, &iloc
);
4856 BUFFER_TRACE(iloc
.bh
, "get_write_access");
4857 err
= jbd2_journal_get_write_access(handle
, iloc
.bh
);
4859 err
= ext4_handle_dirty_metadata(handle
,
4865 ext4_std_error(inode
->i_sb
, err
);
4870 int ext4_change_inode_journal_flag(struct inode
*inode
, int val
)
4877 * We have to be very careful here: changing a data block's
4878 * journaling status dynamically is dangerous. If we write a
4879 * data block to the journal, change the status and then delete
4880 * that block, we risk forgetting to revoke the old log record
4881 * from the journal and so a subsequent replay can corrupt data.
4882 * So, first we make sure that the journal is empty and that
4883 * nobody is changing anything.
4886 journal
= EXT4_JOURNAL(inode
);
4889 if (is_journal_aborted(journal
))
4891 /* We have to allocate physical blocks for delalloc blocks
4892 * before flushing journal. otherwise delalloc blocks can not
4893 * be allocated any more. even more truncate on delalloc blocks
4894 * could trigger BUG by flushing delalloc blocks in journal.
4895 * There is no delalloc block in non-journal data mode.
4897 if (val
&& test_opt(inode
->i_sb
, DELALLOC
)) {
4898 err
= ext4_alloc_da_blocks(inode
);
4903 /* Wait for all existing dio workers */
4904 ext4_inode_block_unlocked_dio(inode
);
4905 inode_dio_wait(inode
);
4907 jbd2_journal_lock_updates(journal
);
4910 * OK, there are no updates running now, and all cached data is
4911 * synced to disk. We are now in a completely consistent state
4912 * which doesn't have anything in the journal, and we know that
4913 * no filesystem updates are running, so it is safe to modify
4914 * the inode's in-core data-journaling state flag now.
4918 ext4_set_inode_flag(inode
, EXT4_INODE_JOURNAL_DATA
);
4920 jbd2_journal_flush(journal
);
4921 ext4_clear_inode_flag(inode
, EXT4_INODE_JOURNAL_DATA
);
4923 ext4_set_aops(inode
);
4925 jbd2_journal_unlock_updates(journal
);
4926 ext4_inode_resume_unlocked_dio(inode
);
4928 /* Finally we can mark the inode as dirty. */
4930 handle
= ext4_journal_start(inode
, EXT4_HT_INODE
, 1);
4932 return PTR_ERR(handle
);
4934 err
= ext4_mark_inode_dirty(handle
, inode
);
4935 ext4_handle_sync(handle
);
4936 ext4_journal_stop(handle
);
4937 ext4_std_error(inode
->i_sb
, err
);
4942 static int ext4_bh_unmapped(handle_t
*handle
, struct buffer_head
*bh
)
4944 return !buffer_mapped(bh
);
4947 int ext4_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
4949 struct page
*page
= vmf
->page
;
4953 struct file
*file
= vma
->vm_file
;
4954 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
4955 struct address_space
*mapping
= inode
->i_mapping
;
4957 get_block_t
*get_block
;
4960 sb_start_pagefault(inode
->i_sb
);
4961 file_update_time(vma
->vm_file
);
4962 /* Delalloc case is easy... */
4963 if (test_opt(inode
->i_sb
, DELALLOC
) &&
4964 !ext4_should_journal_data(inode
) &&
4965 !ext4_nonda_switch(inode
->i_sb
)) {
4967 ret
= __block_page_mkwrite(vma
, vmf
,
4968 ext4_da_get_block_prep
);
4969 } while (ret
== -ENOSPC
&&
4970 ext4_should_retry_alloc(inode
->i_sb
, &retries
));
4975 size
= i_size_read(inode
);
4976 /* Page got truncated from under us? */
4977 if (page
->mapping
!= mapping
|| page_offset(page
) > size
) {
4979 ret
= VM_FAULT_NOPAGE
;
4983 if (page
->index
== size
>> PAGE_CACHE_SHIFT
)
4984 len
= size
& ~PAGE_CACHE_MASK
;
4986 len
= PAGE_CACHE_SIZE
;
4988 * Return if we have all the buffers mapped. This avoids the need to do
4989 * journal_start/journal_stop which can block and take a long time
4991 if (page_has_buffers(page
)) {
4992 if (!ext4_walk_page_buffers(NULL
, page_buffers(page
),
4994 ext4_bh_unmapped
)) {
4995 /* Wait so that we don't change page under IO */
4996 wait_on_page_writeback(page
);
4997 ret
= VM_FAULT_LOCKED
;
5002 /* OK, we need to fill the hole... */
5003 if (ext4_should_dioread_nolock(inode
))
5004 get_block
= ext4_get_block_write
;
5006 get_block
= ext4_get_block
;
5008 handle
= ext4_journal_start(inode
, EXT4_HT_WRITE_PAGE
,
5009 ext4_writepage_trans_blocks(inode
));
5010 if (IS_ERR(handle
)) {
5011 ret
= VM_FAULT_SIGBUS
;
5014 ret
= __block_page_mkwrite(vma
, vmf
, get_block
);
5015 if (!ret
&& ext4_should_journal_data(inode
)) {
5016 if (ext4_walk_page_buffers(handle
, page_buffers(page
), 0,
5017 PAGE_CACHE_SIZE
, NULL
, do_journal_get_write_access
)) {
5019 ret
= VM_FAULT_SIGBUS
;
5020 ext4_journal_stop(handle
);
5023 ext4_set_inode_state(inode
, EXT4_STATE_JDATA
);
5025 ext4_journal_stop(handle
);
5026 if (ret
== -ENOSPC
&& ext4_should_retry_alloc(inode
->i_sb
, &retries
))
5029 ret
= block_page_mkwrite_return(ret
);
5031 sb_end_pagefault(inode
->i_sb
);