4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/f2fs_fs.h>
13 #include <linux/buffer_head.h>
14 #include <linux/mpage.h>
15 #include <linux/writeback.h>
16 #include <linux/backing-dev.h>
17 #include <linux/pagevec.h>
18 #include <linux/blkdev.h>
19 #include <linux/bio.h>
20 #include <linux/prefetch.h>
21 #include <linux/uio.h>
22 #include <linux/cleancache.h>
28 #include <trace/events/f2fs.h>
30 static void f2fs_read_end_io(struct bio
*bio
)
35 if (f2fs_bio_encrypted(bio
)) {
37 f2fs_release_crypto_ctx(bio
->bi_private
);
39 f2fs_end_io_crypto_work(bio
->bi_private
, bio
);
44 bio_for_each_segment_all(bvec
, bio
, i
) {
45 struct page
*page
= bvec
->bv_page
;
48 SetPageUptodate(page
);
50 ClearPageUptodate(page
);
58 static void f2fs_write_end_io(struct bio
*bio
)
60 struct f2fs_sb_info
*sbi
= bio
->bi_private
;
64 bio_for_each_segment_all(bvec
, bio
, i
) {
65 struct page
*page
= bvec
->bv_page
;
67 f2fs_restore_and_release_control_page(&page
);
69 if (unlikely(bio
->bi_error
)) {
71 set_bit(AS_EIO
, &page
->mapping
->flags
);
72 f2fs_stop_checkpoint(sbi
);
74 end_page_writeback(page
);
75 dec_page_count(sbi
, F2FS_WRITEBACK
);
78 if (!get_pages(sbi
, F2FS_WRITEBACK
) &&
79 !list_empty(&sbi
->cp_wait
.task_list
))
80 wake_up(&sbi
->cp_wait
);
86 * Low-level block read/write IO operations.
88 static struct bio
*__bio_alloc(struct f2fs_sb_info
*sbi
, block_t blk_addr
,
89 int npages
, bool is_read
)
93 bio
= f2fs_bio_alloc(npages
);
95 bio
->bi_bdev
= sbi
->sb
->s_bdev
;
96 bio
->bi_iter
.bi_sector
= SECTOR_FROM_BLOCK(blk_addr
);
97 bio
->bi_end_io
= is_read
? f2fs_read_end_io
: f2fs_write_end_io
;
98 bio
->bi_private
= is_read
? NULL
: sbi
;
103 static void __submit_merged_bio(struct f2fs_bio_info
*io
)
105 struct f2fs_io_info
*fio
= &io
->fio
;
110 if (is_read_io(fio
->rw
))
111 trace_f2fs_submit_read_bio(io
->sbi
->sb
, fio
, io
->bio
);
113 trace_f2fs_submit_write_bio(io
->sbi
->sb
, fio
, io
->bio
);
115 submit_bio(fio
->rw
, io
->bio
);
119 void f2fs_submit_merged_bio(struct f2fs_sb_info
*sbi
,
120 enum page_type type
, int rw
)
122 enum page_type btype
= PAGE_TYPE_OF_BIO(type
);
123 struct f2fs_bio_info
*io
;
125 io
= is_read_io(rw
) ? &sbi
->read_io
: &sbi
->write_io
[btype
];
127 down_write(&io
->io_rwsem
);
129 /* change META to META_FLUSH in the checkpoint procedure */
130 if (type
>= META_FLUSH
) {
131 io
->fio
.type
= META_FLUSH
;
132 if (test_opt(sbi
, NOBARRIER
))
133 io
->fio
.rw
= WRITE_FLUSH
| REQ_META
| REQ_PRIO
;
135 io
->fio
.rw
= WRITE_FLUSH_FUA
| REQ_META
| REQ_PRIO
;
137 __submit_merged_bio(io
);
138 up_write(&io
->io_rwsem
);
142 * Fill the locked page with data located in the block address.
143 * Return unlocked page.
145 int f2fs_submit_page_bio(struct f2fs_io_info
*fio
)
148 struct page
*page
= fio
->encrypted_page
? fio
->encrypted_page
: fio
->page
;
150 trace_f2fs_submit_page_bio(page
, fio
);
151 f2fs_trace_ios(fio
, 0);
153 /* Allocate a new bio */
154 bio
= __bio_alloc(fio
->sbi
, fio
->blk_addr
, 1, is_read_io(fio
->rw
));
156 if (bio_add_page(bio
, page
, PAGE_CACHE_SIZE
, 0) < PAGE_CACHE_SIZE
) {
161 submit_bio(fio
->rw
, bio
);
165 void f2fs_submit_page_mbio(struct f2fs_io_info
*fio
)
167 struct f2fs_sb_info
*sbi
= fio
->sbi
;
168 enum page_type btype
= PAGE_TYPE_OF_BIO(fio
->type
);
169 struct f2fs_bio_info
*io
;
170 bool is_read
= is_read_io(fio
->rw
);
171 struct page
*bio_page
;
173 io
= is_read
? &sbi
->read_io
: &sbi
->write_io
[btype
];
175 verify_block_addr(sbi
, fio
->blk_addr
);
177 down_write(&io
->io_rwsem
);
180 inc_page_count(sbi
, F2FS_WRITEBACK
);
182 if (io
->bio
&& (io
->last_block_in_bio
!= fio
->blk_addr
- 1 ||
183 io
->fio
.rw
!= fio
->rw
))
184 __submit_merged_bio(io
);
186 if (io
->bio
== NULL
) {
187 int bio_blocks
= MAX_BIO_BLOCKS(sbi
);
189 io
->bio
= __bio_alloc(sbi
, fio
->blk_addr
, bio_blocks
, is_read
);
193 bio_page
= fio
->encrypted_page
? fio
->encrypted_page
: fio
->page
;
195 if (bio_add_page(io
->bio
, bio_page
, PAGE_CACHE_SIZE
, 0) <
197 __submit_merged_bio(io
);
201 io
->last_block_in_bio
= fio
->blk_addr
;
202 f2fs_trace_ios(fio
, 0);
204 up_write(&io
->io_rwsem
);
205 trace_f2fs_submit_page_mbio(fio
->page
, fio
);
209 * Lock ordering for the change of data block address:
212 * update block addresses in the node page
214 void set_data_blkaddr(struct dnode_of_data
*dn
)
216 struct f2fs_node
*rn
;
218 struct page
*node_page
= dn
->node_page
;
219 unsigned int ofs_in_node
= dn
->ofs_in_node
;
221 f2fs_wait_on_page_writeback(node_page
, NODE
);
223 rn
= F2FS_NODE(node_page
);
225 /* Get physical address of data block */
226 addr_array
= blkaddr_in_node(rn
);
227 addr_array
[ofs_in_node
] = cpu_to_le32(dn
->data_blkaddr
);
228 if (set_page_dirty(node_page
))
229 dn
->node_changed
= true;
232 int reserve_new_block(struct dnode_of_data
*dn
)
234 struct f2fs_sb_info
*sbi
= F2FS_I_SB(dn
->inode
);
236 if (unlikely(is_inode_flag_set(F2FS_I(dn
->inode
), FI_NO_ALLOC
)))
238 if (unlikely(!inc_valid_block_count(sbi
, dn
->inode
, 1)))
241 trace_f2fs_reserve_new_block(dn
->inode
, dn
->nid
, dn
->ofs_in_node
);
243 dn
->data_blkaddr
= NEW_ADDR
;
244 set_data_blkaddr(dn
);
245 mark_inode_dirty(dn
->inode
);
250 int f2fs_reserve_block(struct dnode_of_data
*dn
, pgoff_t index
)
252 bool need_put
= dn
->inode_page
? false : true;
255 err
= get_dnode_of_data(dn
, index
, ALLOC_NODE
);
259 if (dn
->data_blkaddr
== NULL_ADDR
)
260 err
= reserve_new_block(dn
);
266 int f2fs_get_block(struct dnode_of_data
*dn
, pgoff_t index
)
268 struct extent_info ei
;
269 struct inode
*inode
= dn
->inode
;
271 if (f2fs_lookup_extent_cache(inode
, index
, &ei
)) {
272 dn
->data_blkaddr
= ei
.blk
+ index
- ei
.fofs
;
276 return f2fs_reserve_block(dn
, index
);
279 struct page
*get_read_data_page(struct inode
*inode
, pgoff_t index
,
280 int rw
, bool for_write
)
282 struct address_space
*mapping
= inode
->i_mapping
;
283 struct dnode_of_data dn
;
285 struct extent_info ei
;
287 struct f2fs_io_info fio
= {
288 .sbi
= F2FS_I_SB(inode
),
291 .encrypted_page
= NULL
,
294 if (f2fs_encrypted_inode(inode
) && S_ISREG(inode
->i_mode
))
295 return read_mapping_page(mapping
, index
, NULL
);
297 page
= f2fs_grab_cache_page(mapping
, index
, for_write
);
299 return ERR_PTR(-ENOMEM
);
301 if (f2fs_lookup_extent_cache(inode
, index
, &ei
)) {
302 dn
.data_blkaddr
= ei
.blk
+ index
- ei
.fofs
;
306 set_new_dnode(&dn
, inode
, NULL
, NULL
, 0);
307 err
= get_dnode_of_data(&dn
, index
, LOOKUP_NODE
);
312 if (unlikely(dn
.data_blkaddr
== NULL_ADDR
)) {
317 if (PageUptodate(page
)) {
323 * A new dentry page is allocated but not able to be written, since its
324 * new inode page couldn't be allocated due to -ENOSPC.
325 * In such the case, its blkaddr can be remained as NEW_ADDR.
326 * see, f2fs_add_link -> get_new_data_page -> init_inode_metadata.
328 if (dn
.data_blkaddr
== NEW_ADDR
) {
329 zero_user_segment(page
, 0, PAGE_CACHE_SIZE
);
330 SetPageUptodate(page
);
335 fio
.blk_addr
= dn
.data_blkaddr
;
337 err
= f2fs_submit_page_bio(&fio
);
343 f2fs_put_page(page
, 1);
347 struct page
*find_data_page(struct inode
*inode
, pgoff_t index
)
349 struct address_space
*mapping
= inode
->i_mapping
;
352 page
= find_get_page(mapping
, index
);
353 if (page
&& PageUptodate(page
))
355 f2fs_put_page(page
, 0);
357 page
= get_read_data_page(inode
, index
, READ_SYNC
, false);
361 if (PageUptodate(page
))
364 wait_on_page_locked(page
);
365 if (unlikely(!PageUptodate(page
))) {
366 f2fs_put_page(page
, 0);
367 return ERR_PTR(-EIO
);
373 * If it tries to access a hole, return an error.
374 * Because, the callers, functions in dir.c and GC, should be able to know
375 * whether this page exists or not.
377 struct page
*get_lock_data_page(struct inode
*inode
, pgoff_t index
,
380 struct address_space
*mapping
= inode
->i_mapping
;
383 page
= get_read_data_page(inode
, index
, READ_SYNC
, for_write
);
387 /* wait for read completion */
389 if (unlikely(!PageUptodate(page
))) {
390 f2fs_put_page(page
, 1);
391 return ERR_PTR(-EIO
);
393 if (unlikely(page
->mapping
!= mapping
)) {
394 f2fs_put_page(page
, 1);
401 * Caller ensures that this data page is never allocated.
402 * A new zero-filled data page is allocated in the page cache.
404 * Also, caller should grab and release a rwsem by calling f2fs_lock_op() and
406 * Note that, ipage is set only by make_empty_dir, and if any error occur,
407 * ipage should be released by this function.
409 struct page
*get_new_data_page(struct inode
*inode
,
410 struct page
*ipage
, pgoff_t index
, bool new_i_size
)
412 struct address_space
*mapping
= inode
->i_mapping
;
414 struct dnode_of_data dn
;
417 page
= f2fs_grab_cache_page(mapping
, index
, true);
420 * before exiting, we should make sure ipage will be released
421 * if any error occur.
423 f2fs_put_page(ipage
, 1);
424 return ERR_PTR(-ENOMEM
);
427 set_new_dnode(&dn
, inode
, ipage
, NULL
, 0);
428 err
= f2fs_reserve_block(&dn
, index
);
430 f2fs_put_page(page
, 1);
436 if (PageUptodate(page
))
439 if (dn
.data_blkaddr
== NEW_ADDR
) {
440 zero_user_segment(page
, 0, PAGE_CACHE_SIZE
);
441 SetPageUptodate(page
);
443 f2fs_put_page(page
, 1);
445 /* if ipage exists, blkaddr should be NEW_ADDR */
446 f2fs_bug_on(F2FS_I_SB(inode
), ipage
);
447 page
= get_lock_data_page(inode
, index
, true);
452 if (new_i_size
&& i_size_read(inode
) <
453 ((loff_t
)(index
+ 1) << PAGE_CACHE_SHIFT
)) {
454 i_size_write(inode
, ((loff_t
)(index
+ 1) << PAGE_CACHE_SHIFT
));
455 /* Only the directory inode sets new_i_size */
456 set_inode_flag(F2FS_I(inode
), FI_UPDATE_DIR
);
461 static int __allocate_data_block(struct dnode_of_data
*dn
)
463 struct f2fs_sb_info
*sbi
= F2FS_I_SB(dn
->inode
);
464 struct f2fs_inode_info
*fi
= F2FS_I(dn
->inode
);
465 struct f2fs_summary sum
;
467 int seg
= CURSEG_WARM_DATA
;
470 if (unlikely(is_inode_flag_set(F2FS_I(dn
->inode
), FI_NO_ALLOC
)))
473 dn
->data_blkaddr
= datablock_addr(dn
->node_page
, dn
->ofs_in_node
);
474 if (dn
->data_blkaddr
== NEW_ADDR
)
477 if (unlikely(!inc_valid_block_count(sbi
, dn
->inode
, 1)))
481 get_node_info(sbi
, dn
->nid
, &ni
);
482 set_summary(&sum
, dn
->nid
, dn
->ofs_in_node
, ni
.version
);
484 if (dn
->ofs_in_node
== 0 && dn
->inode_page
== dn
->node_page
)
485 seg
= CURSEG_DIRECT_IO
;
487 allocate_data_block(sbi
, NULL
, dn
->data_blkaddr
, &dn
->data_blkaddr
,
489 set_data_blkaddr(dn
);
492 fofs
= start_bidx_of_node(ofs_of_node(dn
->node_page
), fi
) +
494 if (i_size_read(dn
->inode
) < ((loff_t
)(fofs
+ 1) << PAGE_CACHE_SHIFT
))
495 i_size_write(dn
->inode
,
496 ((loff_t
)(fofs
+ 1) << PAGE_CACHE_SHIFT
));
500 static int __allocate_data_blocks(struct inode
*inode
, loff_t offset
,
503 struct f2fs_sb_info
*sbi
= F2FS_I_SB(inode
);
504 struct dnode_of_data dn
;
505 u64 start
= F2FS_BYTES_TO_BLK(offset
);
506 u64 len
= F2FS_BYTES_TO_BLK(count
);
514 /* When reading holes, we need its node page */
515 set_new_dnode(&dn
, inode
, NULL
, NULL
, 0);
516 err
= get_dnode_of_data(&dn
, start
, ALLOC_NODE
);
521 end_offset
= ADDRS_PER_PAGE(dn
.node_page
, F2FS_I(inode
));
523 while (dn
.ofs_in_node
< end_offset
&& len
) {
526 if (unlikely(f2fs_cp_error(sbi
))) {
531 blkaddr
= datablock_addr(dn
.node_page
, dn
.ofs_in_node
);
532 if (blkaddr
== NULL_ADDR
|| blkaddr
== NEW_ADDR
) {
533 err
= __allocate_data_block(&dn
);
544 sync_inode_page(&dn
);
549 f2fs_balance_fs(sbi
, dn
.node_changed
);
555 sync_inode_page(&dn
);
559 f2fs_balance_fs(sbi
, dn
.node_changed
);
564 * f2fs_map_blocks() now supported readahead/bmap/rw direct_IO with
565 * f2fs_map_blocks structure.
566 * If original data blocks are allocated, then give them to blockdev.
568 * a. preallocate requested block addresses
569 * b. do not use extent cache for better performance
570 * c. give the block addresses to blockdev
572 int f2fs_map_blocks(struct inode
*inode
, struct f2fs_map_blocks
*map
,
573 int create
, int flag
)
575 unsigned int maxblocks
= map
->m_len
;
576 struct dnode_of_data dn
;
577 struct f2fs_sb_info
*sbi
= F2FS_I_SB(inode
);
578 int mode
= create
? ALLOC_NODE
: LOOKUP_NODE_RA
;
579 pgoff_t pgofs
, end_offset
;
580 int err
= 0, ofs
= 1;
581 struct extent_info ei
;
582 bool allocated
= false;
588 /* it only supports block size == page size */
589 pgofs
= (pgoff_t
)map
->m_lblk
;
591 if (f2fs_lookup_extent_cache(inode
, pgofs
, &ei
)) {
592 map
->m_pblk
= ei
.blk
+ pgofs
- ei
.fofs
;
593 map
->m_len
= min((pgoff_t
)maxblocks
, ei
.fofs
+ ei
.len
- pgofs
);
594 map
->m_flags
= F2FS_MAP_MAPPED
;
601 /* When reading holes, we need its node page */
602 set_new_dnode(&dn
, inode
, NULL
, NULL
, 0);
603 err
= get_dnode_of_data(&dn
, pgofs
, mode
);
610 if (dn
.data_blkaddr
== NEW_ADDR
|| dn
.data_blkaddr
== NULL_ADDR
) {
612 if (unlikely(f2fs_cp_error(sbi
))) {
616 err
= __allocate_data_block(&dn
);
620 map
->m_flags
= F2FS_MAP_NEW
;
622 if (flag
!= F2FS_GET_BLOCK_FIEMAP
||
623 dn
.data_blkaddr
!= NEW_ADDR
) {
624 if (flag
== F2FS_GET_BLOCK_BMAP
)
630 * preallocated unwritten block should be mapped
633 if (dn
.data_blkaddr
== NEW_ADDR
)
634 map
->m_flags
= F2FS_MAP_UNWRITTEN
;
638 map
->m_flags
|= F2FS_MAP_MAPPED
;
639 map
->m_pblk
= dn
.data_blkaddr
;
642 end_offset
= ADDRS_PER_PAGE(dn
.node_page
, F2FS_I(inode
));
647 if (map
->m_len
>= maxblocks
)
650 if (dn
.ofs_in_node
>= end_offset
) {
652 sync_inode_page(&dn
);
658 f2fs_balance_fs(sbi
, dn
.node_changed
);
662 set_new_dnode(&dn
, inode
, NULL
, NULL
, 0);
663 err
= get_dnode_of_data(&dn
, pgofs
, mode
);
670 end_offset
= ADDRS_PER_PAGE(dn
.node_page
, F2FS_I(inode
));
673 blkaddr
= datablock_addr(dn
.node_page
, dn
.ofs_in_node
);
675 if (blkaddr
== NEW_ADDR
|| blkaddr
== NULL_ADDR
) {
677 if (unlikely(f2fs_cp_error(sbi
))) {
681 err
= __allocate_data_block(&dn
);
685 map
->m_flags
|= F2FS_MAP_NEW
;
686 blkaddr
= dn
.data_blkaddr
;
689 * we only merge preallocated unwritten blocks
692 if (flag
!= F2FS_GET_BLOCK_FIEMAP
||
698 /* Give more consecutive addresses for the readahead */
699 if ((map
->m_pblk
!= NEW_ADDR
&&
700 blkaddr
== (map
->m_pblk
+ ofs
)) ||
701 (map
->m_pblk
== NEW_ADDR
&&
702 blkaddr
== NEW_ADDR
)) {
712 sync_inode_page(&dn
);
718 f2fs_balance_fs(sbi
, dn
.node_changed
);
721 trace_f2fs_map_blocks(inode
, map
, err
);
725 static int __get_data_block(struct inode
*inode
, sector_t iblock
,
726 struct buffer_head
*bh
, int create
, int flag
)
728 struct f2fs_map_blocks map
;
732 map
.m_len
= bh
->b_size
>> inode
->i_blkbits
;
734 ret
= f2fs_map_blocks(inode
, &map
, create
, flag
);
736 map_bh(bh
, inode
->i_sb
, map
.m_pblk
);
737 bh
->b_state
= (bh
->b_state
& ~F2FS_MAP_FLAGS
) | map
.m_flags
;
738 bh
->b_size
= map
.m_len
<< inode
->i_blkbits
;
743 static int get_data_block(struct inode
*inode
, sector_t iblock
,
744 struct buffer_head
*bh_result
, int create
, int flag
)
746 return __get_data_block(inode
, iblock
, bh_result
, create
, flag
);
749 static int get_data_block_dio(struct inode
*inode
, sector_t iblock
,
750 struct buffer_head
*bh_result
, int create
)
752 return __get_data_block(inode
, iblock
, bh_result
, create
,
756 static int get_data_block_bmap(struct inode
*inode
, sector_t iblock
,
757 struct buffer_head
*bh_result
, int create
)
759 /* Block number less than F2FS MAX BLOCKS */
760 if (unlikely(iblock
>= F2FS_I_SB(inode
)->max_file_blocks
))
763 return __get_data_block(inode
, iblock
, bh_result
, create
,
764 F2FS_GET_BLOCK_BMAP
);
767 static inline sector_t
logical_to_blk(struct inode
*inode
, loff_t offset
)
769 return (offset
>> inode
->i_blkbits
);
772 static inline loff_t
blk_to_logical(struct inode
*inode
, sector_t blk
)
774 return (blk
<< inode
->i_blkbits
);
777 int f2fs_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
780 struct buffer_head map_bh
;
781 sector_t start_blk
, last_blk
;
783 u64 logical
= 0, phys
= 0, size
= 0;
787 ret
= fiemap_check_flags(fieinfo
, FIEMAP_FLAG_SYNC
);
791 if (f2fs_has_inline_data(inode
)) {
792 ret
= f2fs_inline_data_fiemap(inode
, fieinfo
, start
, len
);
799 isize
= i_size_read(inode
);
803 if (start
+ len
> isize
)
806 if (logical_to_blk(inode
, len
) == 0)
807 len
= blk_to_logical(inode
, 1);
809 start_blk
= logical_to_blk(inode
, start
);
810 last_blk
= logical_to_blk(inode
, start
+ len
- 1);
813 memset(&map_bh
, 0, sizeof(struct buffer_head
));
816 ret
= get_data_block(inode
, start_blk
, &map_bh
, 0,
817 F2FS_GET_BLOCK_FIEMAP
);
822 if (!buffer_mapped(&map_bh
)) {
823 /* Go through holes util pass the EOF */
824 if (blk_to_logical(inode
, start_blk
++) < isize
)
826 /* Found a hole beyond isize means no more extents.
827 * Note that the premise is that filesystems don't
828 * punch holes beyond isize and keep size unchanged.
830 flags
|= FIEMAP_EXTENT_LAST
;
834 if (f2fs_encrypted_inode(inode
))
835 flags
|= FIEMAP_EXTENT_DATA_ENCRYPTED
;
837 ret
= fiemap_fill_next_extent(fieinfo
, logical
,
841 if (start_blk
> last_blk
|| ret
)
844 logical
= blk_to_logical(inode
, start_blk
);
845 phys
= blk_to_logical(inode
, map_bh
.b_blocknr
);
846 size
= map_bh
.b_size
;
848 if (buffer_unwritten(&map_bh
))
849 flags
= FIEMAP_EXTENT_UNWRITTEN
;
851 start_blk
+= logical_to_blk(inode
, size
);
855 if (fatal_signal_pending(current
))
868 * This function was originally taken from fs/mpage.c, and customized for f2fs.
869 * Major change was from block_size == page_size in f2fs by default.
871 static int f2fs_mpage_readpages(struct address_space
*mapping
,
872 struct list_head
*pages
, struct page
*page
,
875 struct bio
*bio
= NULL
;
877 sector_t last_block_in_bio
= 0;
878 struct inode
*inode
= mapping
->host
;
879 const unsigned blkbits
= inode
->i_blkbits
;
880 const unsigned blocksize
= 1 << blkbits
;
881 sector_t block_in_file
;
883 sector_t last_block_in_file
;
885 struct block_device
*bdev
= inode
->i_sb
->s_bdev
;
886 struct f2fs_map_blocks map
;
893 for (page_idx
= 0; nr_pages
; page_idx
++, nr_pages
--) {
895 prefetchw(&page
->flags
);
897 page
= list_entry(pages
->prev
, struct page
, lru
);
898 list_del(&page
->lru
);
899 if (add_to_page_cache_lru(page
, mapping
,
900 page
->index
, GFP_KERNEL
))
904 block_in_file
= (sector_t
)page
->index
;
905 last_block
= block_in_file
+ nr_pages
;
906 last_block_in_file
= (i_size_read(inode
) + blocksize
- 1) >>
908 if (last_block
> last_block_in_file
)
909 last_block
= last_block_in_file
;
912 * Map blocks using the previous result first.
914 if ((map
.m_flags
& F2FS_MAP_MAPPED
) &&
915 block_in_file
> map
.m_lblk
&&
916 block_in_file
< (map
.m_lblk
+ map
.m_len
))
920 * Then do more f2fs_map_blocks() calls until we are
921 * done with this page.
925 if (block_in_file
< last_block
) {
926 map
.m_lblk
= block_in_file
;
927 map
.m_len
= last_block
- block_in_file
;
929 if (f2fs_map_blocks(inode
, &map
, 0,
930 F2FS_GET_BLOCK_READ
))
934 if ((map
.m_flags
& F2FS_MAP_MAPPED
)) {
935 block_nr
= map
.m_pblk
+ block_in_file
- map
.m_lblk
;
936 SetPageMappedToDisk(page
);
938 if (!PageUptodate(page
) && !cleancache_get_page(page
)) {
939 SetPageUptodate(page
);
943 zero_user_segment(page
, 0, PAGE_CACHE_SIZE
);
944 SetPageUptodate(page
);
950 * This page will go to BIO. Do we need to send this
953 if (bio
&& (last_block_in_bio
!= block_nr
- 1)) {
955 submit_bio(READ
, bio
);
959 struct f2fs_crypto_ctx
*ctx
= NULL
;
961 if (f2fs_encrypted_inode(inode
) &&
962 S_ISREG(inode
->i_mode
)) {
964 ctx
= f2fs_get_crypto_ctx(inode
);
968 /* wait the page to be moved by cleaning */
969 f2fs_wait_on_encrypted_page_writeback(
970 F2FS_I_SB(inode
), block_nr
);
973 bio
= bio_alloc(GFP_KERNEL
,
974 min_t(int, nr_pages
, BIO_MAX_PAGES
));
977 f2fs_release_crypto_ctx(ctx
);
981 bio
->bi_iter
.bi_sector
= SECTOR_FROM_BLOCK(block_nr
);
982 bio
->bi_end_io
= f2fs_read_end_io
;
983 bio
->bi_private
= ctx
;
986 if (bio_add_page(bio
, page
, blocksize
, 0) < blocksize
)
987 goto submit_and_realloc
;
989 last_block_in_bio
= block_nr
;
993 zero_user_segment(page
, 0, PAGE_CACHE_SIZE
);
998 submit_bio(READ
, bio
);
1004 page_cache_release(page
);
1006 BUG_ON(pages
&& !list_empty(pages
));
1008 submit_bio(READ
, bio
);
1012 static int f2fs_read_data_page(struct file
*file
, struct page
*page
)
1014 struct inode
*inode
= page
->mapping
->host
;
1017 trace_f2fs_readpage(page
, DATA
);
1019 /* If the file has inline data, try to read it directly */
1020 if (f2fs_has_inline_data(inode
))
1021 ret
= f2fs_read_inline_data(inode
, page
);
1023 ret
= f2fs_mpage_readpages(page
->mapping
, NULL
, page
, 1);
1027 static int f2fs_read_data_pages(struct file
*file
,
1028 struct address_space
*mapping
,
1029 struct list_head
*pages
, unsigned nr_pages
)
1031 struct inode
*inode
= file
->f_mapping
->host
;
1032 struct page
*page
= list_entry(pages
->prev
, struct page
, lru
);
1034 trace_f2fs_readpages(inode
, page
, nr_pages
);
1036 /* If the file has inline data, skip readpages */
1037 if (f2fs_has_inline_data(inode
))
1040 return f2fs_mpage_readpages(mapping
, pages
, NULL
, nr_pages
);
1043 int do_write_data_page(struct f2fs_io_info
*fio
)
1045 struct page
*page
= fio
->page
;
1046 struct inode
*inode
= page
->mapping
->host
;
1047 struct dnode_of_data dn
;
1050 set_new_dnode(&dn
, inode
, NULL
, NULL
, 0);
1051 err
= get_dnode_of_data(&dn
, page
->index
, LOOKUP_NODE
);
1055 fio
->blk_addr
= dn
.data_blkaddr
;
1057 /* This page is already truncated */
1058 if (fio
->blk_addr
== NULL_ADDR
) {
1059 ClearPageUptodate(page
);
1063 if (f2fs_encrypted_inode(inode
) && S_ISREG(inode
->i_mode
)) {
1065 /* wait for GCed encrypted page writeback */
1066 f2fs_wait_on_encrypted_page_writeback(F2FS_I_SB(inode
),
1069 fio
->encrypted_page
= f2fs_encrypt(inode
, fio
->page
);
1070 if (IS_ERR(fio
->encrypted_page
)) {
1071 err
= PTR_ERR(fio
->encrypted_page
);
1076 set_page_writeback(page
);
1079 * If current allocation needs SSR,
1080 * it had better in-place writes for updated data.
1082 if (unlikely(fio
->blk_addr
!= NEW_ADDR
&&
1083 !is_cold_data(page
) &&
1084 !IS_ATOMIC_WRITTEN_PAGE(page
) &&
1085 need_inplace_update(inode
))) {
1086 rewrite_data_page(fio
);
1087 set_inode_flag(F2FS_I(inode
), FI_UPDATE_WRITE
);
1088 trace_f2fs_do_write_data_page(page
, IPU
);
1090 write_data_page(&dn
, fio
);
1091 set_data_blkaddr(&dn
);
1092 f2fs_update_extent_cache(&dn
);
1093 trace_f2fs_do_write_data_page(page
, OPU
);
1094 set_inode_flag(F2FS_I(inode
), FI_APPEND_WRITE
);
1095 if (page
->index
== 0)
1096 set_inode_flag(F2FS_I(inode
), FI_FIRST_BLOCK_WRITTEN
);
1099 f2fs_put_dnode(&dn
);
1103 static int f2fs_write_data_page(struct page
*page
,
1104 struct writeback_control
*wbc
)
1106 struct inode
*inode
= page
->mapping
->host
;
1107 struct f2fs_sb_info
*sbi
= F2FS_I_SB(inode
);
1108 loff_t i_size
= i_size_read(inode
);
1109 const pgoff_t end_index
= ((unsigned long long) i_size
)
1110 >> PAGE_CACHE_SHIFT
;
1111 unsigned offset
= 0;
1112 bool need_balance_fs
= false;
1114 struct f2fs_io_info fio
= {
1117 .rw
= (wbc
->sync_mode
== WB_SYNC_ALL
) ? WRITE_SYNC
: WRITE
,
1119 .encrypted_page
= NULL
,
1122 trace_f2fs_writepage(page
, DATA
);
1124 if (page
->index
< end_index
)
1128 * If the offset is out-of-range of file size,
1129 * this page does not have to be written to disk.
1131 offset
= i_size
& (PAGE_CACHE_SIZE
- 1);
1132 if ((page
->index
>= end_index
+ 1) || !offset
)
1135 zero_user_segment(page
, offset
, PAGE_CACHE_SIZE
);
1137 if (unlikely(is_sbi_flag_set(sbi
, SBI_POR_DOING
)))
1139 if (f2fs_is_drop_cache(inode
))
1141 if (f2fs_is_volatile_file(inode
) && !wbc
->for_reclaim
&&
1142 available_free_memory(sbi
, BASE_CHECK
))
1145 /* Dentry blocks are controlled by checkpoint */
1146 if (S_ISDIR(inode
->i_mode
)) {
1147 if (unlikely(f2fs_cp_error(sbi
)))
1149 err
= do_write_data_page(&fio
);
1153 /* we should bypass data pages to proceed the kworkder jobs */
1154 if (unlikely(f2fs_cp_error(sbi
))) {
1159 if (!wbc
->for_reclaim
)
1160 need_balance_fs
= true;
1161 else if (has_not_enough_free_secs(sbi
, 0))
1166 if (f2fs_has_inline_data(inode
))
1167 err
= f2fs_write_inline_data(inode
, page
);
1169 err
= do_write_data_page(&fio
);
1170 f2fs_unlock_op(sbi
);
1172 if (err
&& err
!= -ENOENT
)
1175 clear_cold_data(page
);
1177 inode_dec_dirty_pages(inode
);
1179 ClearPageUptodate(page
);
1181 f2fs_balance_fs(sbi
, need_balance_fs
);
1182 if (wbc
->for_reclaim
|| unlikely(f2fs_cp_error(sbi
))) {
1183 f2fs_submit_merged_bio(sbi
, DATA
, WRITE
);
1184 remove_dirty_inode(inode
);
1189 redirty_page_for_writepage(wbc
, page
);
1190 return AOP_WRITEPAGE_ACTIVATE
;
1193 static int __f2fs_writepage(struct page
*page
, struct writeback_control
*wbc
,
1196 struct address_space
*mapping
= data
;
1197 int ret
= mapping
->a_ops
->writepage(page
, wbc
);
1198 mapping_set_error(mapping
, ret
);
1203 * This function was copied from write_cche_pages from mm/page-writeback.c.
1204 * The major change is making write step of cold data page separately from
1205 * warm/hot data page.
1207 static int f2fs_write_cache_pages(struct address_space
*mapping
,
1208 struct writeback_control
*wbc
, writepage_t writepage
,
1213 struct pagevec pvec
;
1215 pgoff_t
uninitialized_var(writeback_index
);
1217 pgoff_t end
; /* Inclusive */
1220 int range_whole
= 0;
1224 pagevec_init(&pvec
, 0);
1226 if (wbc
->range_cyclic
) {
1227 writeback_index
= mapping
->writeback_index
; /* prev offset */
1228 index
= writeback_index
;
1235 index
= wbc
->range_start
>> PAGE_CACHE_SHIFT
;
1236 end
= wbc
->range_end
>> PAGE_CACHE_SHIFT
;
1237 if (wbc
->range_start
== 0 && wbc
->range_end
== LLONG_MAX
)
1239 cycled
= 1; /* ignore range_cyclic tests */
1241 if (wbc
->sync_mode
== WB_SYNC_ALL
|| wbc
->tagged_writepages
)
1242 tag
= PAGECACHE_TAG_TOWRITE
;
1244 tag
= PAGECACHE_TAG_DIRTY
;
1246 if (wbc
->sync_mode
== WB_SYNC_ALL
|| wbc
->tagged_writepages
)
1247 tag_pages_for_writeback(mapping
, index
, end
);
1249 while (!done
&& (index
<= end
)) {
1252 nr_pages
= pagevec_lookup_tag(&pvec
, mapping
, &index
, tag
,
1253 min(end
- index
, (pgoff_t
)PAGEVEC_SIZE
- 1) + 1);
1257 for (i
= 0; i
< nr_pages
; i
++) {
1258 struct page
*page
= pvec
.pages
[i
];
1260 if (page
->index
> end
) {
1265 done_index
= page
->index
;
1269 if (unlikely(page
->mapping
!= mapping
)) {
1275 if (!PageDirty(page
)) {
1276 /* someone wrote it for us */
1277 goto continue_unlock
;
1280 if (step
== is_cold_data(page
))
1281 goto continue_unlock
;
1283 if (PageWriteback(page
)) {
1284 if (wbc
->sync_mode
!= WB_SYNC_NONE
)
1285 f2fs_wait_on_page_writeback(page
, DATA
);
1287 goto continue_unlock
;
1290 BUG_ON(PageWriteback(page
));
1291 if (!clear_page_dirty_for_io(page
))
1292 goto continue_unlock
;
1294 ret
= (*writepage
)(page
, wbc
, data
);
1295 if (unlikely(ret
)) {
1296 if (ret
== AOP_WRITEPAGE_ACTIVATE
) {
1300 done_index
= page
->index
+ 1;
1306 if (--wbc
->nr_to_write
<= 0 &&
1307 wbc
->sync_mode
== WB_SYNC_NONE
) {
1312 pagevec_release(&pvec
);
1321 if (!cycled
&& !done
) {
1324 end
= writeback_index
- 1;
1327 if (wbc
->range_cyclic
|| (range_whole
&& wbc
->nr_to_write
> 0))
1328 mapping
->writeback_index
= done_index
;
1333 static int f2fs_write_data_pages(struct address_space
*mapping
,
1334 struct writeback_control
*wbc
)
1336 struct inode
*inode
= mapping
->host
;
1337 struct f2fs_sb_info
*sbi
= F2FS_I_SB(inode
);
1338 bool locked
= false;
1342 trace_f2fs_writepages(mapping
->host
, wbc
, DATA
);
1344 /* deal with chardevs and other special file */
1345 if (!mapping
->a_ops
->writepage
)
1348 /* skip writing if there is no dirty page in this inode */
1349 if (!get_dirty_pages(inode
) && wbc
->sync_mode
== WB_SYNC_NONE
)
1352 if (S_ISDIR(inode
->i_mode
) && wbc
->sync_mode
== WB_SYNC_NONE
&&
1353 get_dirty_pages(inode
) < nr_pages_to_skip(sbi
, DATA
) &&
1354 available_free_memory(sbi
, DIRTY_DENTS
))
1357 /* skip writing during file defragment */
1358 if (is_inode_flag_set(F2FS_I(inode
), FI_DO_DEFRAG
))
1361 /* during POR, we don't need to trigger writepage at all. */
1362 if (unlikely(is_sbi_flag_set(sbi
, SBI_POR_DOING
)))
1365 diff
= nr_pages_to_write(sbi
, DATA
, wbc
);
1367 if (!S_ISDIR(inode
->i_mode
)) {
1368 mutex_lock(&sbi
->writepages
);
1371 ret
= f2fs_write_cache_pages(mapping
, wbc
, __f2fs_writepage
, mapping
);
1372 f2fs_submit_merged_bio(sbi
, DATA
, WRITE
);
1374 mutex_unlock(&sbi
->writepages
);
1376 remove_dirty_inode(inode
);
1378 wbc
->nr_to_write
= max((long)0, wbc
->nr_to_write
- diff
);
1382 wbc
->pages_skipped
+= get_dirty_pages(inode
);
1386 static void f2fs_write_failed(struct address_space
*mapping
, loff_t to
)
1388 struct inode
*inode
= mapping
->host
;
1389 loff_t i_size
= i_size_read(inode
);
1392 truncate_pagecache(inode
, i_size
);
1393 truncate_blocks(inode
, i_size
, true);
1397 static int prepare_write_begin(struct f2fs_sb_info
*sbi
,
1398 struct page
*page
, loff_t pos
, unsigned len
,
1399 block_t
*blk_addr
, bool *node_changed
)
1401 struct inode
*inode
= page
->mapping
->host
;
1402 pgoff_t index
= page
->index
;
1403 struct dnode_of_data dn
;
1405 bool locked
= false;
1406 struct extent_info ei
;
1409 if (f2fs_has_inline_data(inode
) ||
1410 (pos
& PAGE_CACHE_MASK
) >= i_size_read(inode
)) {
1415 /* check inline_data */
1416 ipage
= get_node_page(sbi
, inode
->i_ino
);
1417 if (IS_ERR(ipage
)) {
1418 err
= PTR_ERR(ipage
);
1422 set_new_dnode(&dn
, inode
, ipage
, ipage
, 0);
1424 if (f2fs_has_inline_data(inode
)) {
1425 if (pos
+ len
<= MAX_INLINE_DATA
) {
1426 read_inline_data(page
, ipage
);
1427 set_inode_flag(F2FS_I(inode
), FI_DATA_EXIST
);
1428 sync_inode_page(&dn
);
1430 err
= f2fs_convert_inline_page(&dn
, page
);
1433 if (dn
.data_blkaddr
== NULL_ADDR
)
1434 err
= f2fs_get_block(&dn
, index
);
1436 } else if (locked
) {
1437 err
= f2fs_get_block(&dn
, index
);
1439 if (f2fs_lookup_extent_cache(inode
, index
, &ei
)) {
1440 dn
.data_blkaddr
= ei
.blk
+ index
- ei
.fofs
;
1442 bool restart
= false;
1445 err
= get_dnode_of_data(&dn
, index
, LOOKUP_NODE
);
1446 if (err
|| (!err
&& dn
.data_blkaddr
== NULL_ADDR
))
1449 f2fs_put_dnode(&dn
);
1457 /* convert_inline_page can make node_changed */
1458 *blk_addr
= dn
.data_blkaddr
;
1459 *node_changed
= dn
.node_changed
;
1461 f2fs_put_dnode(&dn
);
1464 f2fs_unlock_op(sbi
);
1468 static int f2fs_write_begin(struct file
*file
, struct address_space
*mapping
,
1469 loff_t pos
, unsigned len
, unsigned flags
,
1470 struct page
**pagep
, void **fsdata
)
1472 struct inode
*inode
= mapping
->host
;
1473 struct f2fs_sb_info
*sbi
= F2FS_I_SB(inode
);
1474 struct page
*page
= NULL
;
1475 pgoff_t index
= ((unsigned long long) pos
) >> PAGE_CACHE_SHIFT
;
1476 bool need_balance
= false;
1477 block_t blkaddr
= NULL_ADDR
;
1480 trace_f2fs_write_begin(inode
, pos
, len
, flags
);
1483 * We should check this at this moment to avoid deadlock on inode page
1484 * and #0 page. The locking rule for inline_data conversion should be:
1485 * lock_page(page #0) -> lock_page(inode_page)
1488 err
= f2fs_convert_inline_inode(inode
);
1493 page
= grab_cache_page_write_begin(mapping
, index
, flags
);
1501 err
= prepare_write_begin(sbi
, page
, pos
, len
,
1502 &blkaddr
, &need_balance
);
1506 if (need_balance
&& has_not_enough_free_secs(sbi
, 0)) {
1508 f2fs_balance_fs(sbi
, true);
1510 if (page
->mapping
!= mapping
) {
1511 /* The page got truncated from under us */
1512 f2fs_put_page(page
, 1);
1517 f2fs_wait_on_page_writeback(page
, DATA
);
1519 /* wait for GCed encrypted page writeback */
1520 if (f2fs_encrypted_inode(inode
) && S_ISREG(inode
->i_mode
))
1521 f2fs_wait_on_encrypted_page_writeback(sbi
, blkaddr
);
1523 if (len
== PAGE_CACHE_SIZE
)
1525 if (PageUptodate(page
))
1528 if ((pos
& PAGE_CACHE_MASK
) >= i_size_read(inode
)) {
1529 unsigned start
= pos
& (PAGE_CACHE_SIZE
- 1);
1530 unsigned end
= start
+ len
;
1532 /* Reading beyond i_size is simple: memset to zero */
1533 zero_user_segments(page
, 0, start
, end
, PAGE_CACHE_SIZE
);
1537 if (blkaddr
== NEW_ADDR
) {
1538 zero_user_segment(page
, 0, PAGE_CACHE_SIZE
);
1540 struct f2fs_io_info fio
= {
1544 .blk_addr
= blkaddr
,
1546 .encrypted_page
= NULL
,
1548 err
= f2fs_submit_page_bio(&fio
);
1553 if (unlikely(!PageUptodate(page
))) {
1557 if (unlikely(page
->mapping
!= mapping
)) {
1558 f2fs_put_page(page
, 1);
1562 /* avoid symlink page */
1563 if (f2fs_encrypted_inode(inode
) && S_ISREG(inode
->i_mode
)) {
1564 err
= f2fs_decrypt_one(inode
, page
);
1570 SetPageUptodate(page
);
1572 clear_cold_data(page
);
1576 f2fs_put_page(page
, 1);
1577 f2fs_write_failed(mapping
, pos
+ len
);
1581 static int f2fs_write_end(struct file
*file
,
1582 struct address_space
*mapping
,
1583 loff_t pos
, unsigned len
, unsigned copied
,
1584 struct page
*page
, void *fsdata
)
1586 struct inode
*inode
= page
->mapping
->host
;
1588 trace_f2fs_write_end(inode
, pos
, len
, copied
);
1590 set_page_dirty(page
);
1592 if (pos
+ copied
> i_size_read(inode
)) {
1593 i_size_write(inode
, pos
+ copied
);
1594 mark_inode_dirty(inode
);
1595 update_inode_page(inode
);
1598 f2fs_put_page(page
, 1);
1599 f2fs_update_time(F2FS_I_SB(inode
), REQ_TIME
);
1603 static int check_direct_IO(struct inode
*inode
, struct iov_iter
*iter
,
1606 unsigned blocksize_mask
= inode
->i_sb
->s_blocksize
- 1;
1608 if (offset
& blocksize_mask
)
1611 if (iov_iter_alignment(iter
) & blocksize_mask
)
1617 static ssize_t
f2fs_direct_IO(struct kiocb
*iocb
, struct iov_iter
*iter
,
1620 struct file
*file
= iocb
->ki_filp
;
1621 struct address_space
*mapping
= file
->f_mapping
;
1622 struct inode
*inode
= mapping
->host
;
1623 size_t count
= iov_iter_count(iter
);
1626 /* we don't need to use inline_data strictly */
1627 err
= f2fs_convert_inline_inode(inode
);
1631 if (f2fs_encrypted_inode(inode
) && S_ISREG(inode
->i_mode
))
1634 err
= check_direct_IO(inode
, iter
, offset
);
1638 trace_f2fs_direct_IO_enter(inode
, offset
, count
, iov_iter_rw(iter
));
1640 if (iov_iter_rw(iter
) == WRITE
) {
1641 err
= __allocate_data_blocks(inode
, offset
, count
);
1646 err
= blockdev_direct_IO(iocb
, inode
, iter
, offset
, get_data_block_dio
);
1648 if (err
< 0 && iov_iter_rw(iter
) == WRITE
)
1649 f2fs_write_failed(mapping
, offset
+ count
);
1651 trace_f2fs_direct_IO_exit(inode
, offset
, count
, iov_iter_rw(iter
), err
);
1656 void f2fs_invalidate_page(struct page
*page
, unsigned int offset
,
1657 unsigned int length
)
1659 struct inode
*inode
= page
->mapping
->host
;
1660 struct f2fs_sb_info
*sbi
= F2FS_I_SB(inode
);
1662 if (inode
->i_ino
>= F2FS_ROOT_INO(sbi
) &&
1663 (offset
% PAGE_CACHE_SIZE
|| length
!= PAGE_CACHE_SIZE
))
1666 if (PageDirty(page
)) {
1667 if (inode
->i_ino
== F2FS_META_INO(sbi
))
1668 dec_page_count(sbi
, F2FS_DIRTY_META
);
1669 else if (inode
->i_ino
== F2FS_NODE_INO(sbi
))
1670 dec_page_count(sbi
, F2FS_DIRTY_NODES
);
1672 inode_dec_dirty_pages(inode
);
1675 /* This is atomic written page, keep Private */
1676 if (IS_ATOMIC_WRITTEN_PAGE(page
))
1679 ClearPagePrivate(page
);
1682 int f2fs_release_page(struct page
*page
, gfp_t wait
)
1684 /* If this is dirty page, keep PagePrivate */
1685 if (PageDirty(page
))
1688 /* This is atomic written page, keep Private */
1689 if (IS_ATOMIC_WRITTEN_PAGE(page
))
1692 ClearPagePrivate(page
);
1696 static int f2fs_set_data_page_dirty(struct page
*page
)
1698 struct address_space
*mapping
= page
->mapping
;
1699 struct inode
*inode
= mapping
->host
;
1701 trace_f2fs_set_page_dirty(page
, DATA
);
1703 SetPageUptodate(page
);
1705 if (f2fs_is_atomic_file(inode
)) {
1706 if (!IS_ATOMIC_WRITTEN_PAGE(page
)) {
1707 register_inmem_page(inode
, page
);
1711 * Previously, this page has been registered, we just
1717 if (!PageDirty(page
)) {
1718 __set_page_dirty_nobuffers(page
);
1719 update_dirty_page(inode
, page
);
1725 static sector_t
f2fs_bmap(struct address_space
*mapping
, sector_t block
)
1727 struct inode
*inode
= mapping
->host
;
1729 if (f2fs_has_inline_data(inode
))
1732 /* make sure allocating whole blocks */
1733 if (mapping_tagged(mapping
, PAGECACHE_TAG_DIRTY
))
1734 filemap_write_and_wait(mapping
);
1736 return generic_block_bmap(mapping
, block
, get_data_block_bmap
);
1739 const struct address_space_operations f2fs_dblock_aops
= {
1740 .readpage
= f2fs_read_data_page
,
1741 .readpages
= f2fs_read_data_pages
,
1742 .writepage
= f2fs_write_data_page
,
1743 .writepages
= f2fs_write_data_pages
,
1744 .write_begin
= f2fs_write_begin
,
1745 .write_end
= f2fs_write_end
,
1746 .set_page_dirty
= f2fs_set_data_page_dirty
,
1747 .invalidatepage
= f2fs_invalidate_page
,
1748 .releasepage
= f2fs_release_page
,
1749 .direct_IO
= f2fs_direct_IO
,