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/blkdev.h>
18 #include <linux/bio.h>
19 #include <linux/prefetch.h>
24 #include <trace/events/f2fs.h>
27 * Lock ordering for the change of data block address:
30 * update block addresses in the node page
32 static void __set_data_blkaddr(struct dnode_of_data
*dn
, block_t new_addr
)
36 struct page
*node_page
= dn
->node_page
;
37 unsigned int ofs_in_node
= dn
->ofs_in_node
;
39 wait_on_page_writeback(node_page
);
41 rn
= (struct f2fs_node
*)page_address(node_page
);
43 /* Get physical address of data block */
44 addr_array
= blkaddr_in_node(rn
);
45 addr_array
[ofs_in_node
] = cpu_to_le32(new_addr
);
46 set_page_dirty(node_page
);
49 int reserve_new_block(struct dnode_of_data
*dn
)
51 struct f2fs_sb_info
*sbi
= F2FS_SB(dn
->inode
->i_sb
);
53 if (is_inode_flag_set(F2FS_I(dn
->inode
), FI_NO_ALLOC
))
55 if (!inc_valid_block_count(sbi
, dn
->inode
, 1))
58 trace_f2fs_reserve_new_block(dn
->inode
, dn
->nid
, dn
->ofs_in_node
);
60 __set_data_blkaddr(dn
, NEW_ADDR
);
61 dn
->data_blkaddr
= NEW_ADDR
;
66 static int check_extent_cache(struct inode
*inode
, pgoff_t pgofs
,
67 struct buffer_head
*bh_result
)
69 struct f2fs_inode_info
*fi
= F2FS_I(inode
);
70 struct f2fs_sb_info
*sbi
= F2FS_SB(inode
->i_sb
);
71 pgoff_t start_fofs
, end_fofs
;
72 block_t start_blkaddr
;
74 read_lock(&fi
->ext
.ext_lock
);
75 if (fi
->ext
.len
== 0) {
76 read_unlock(&fi
->ext
.ext_lock
);
81 start_fofs
= fi
->ext
.fofs
;
82 end_fofs
= fi
->ext
.fofs
+ fi
->ext
.len
- 1;
83 start_blkaddr
= fi
->ext
.blk_addr
;
85 if (pgofs
>= start_fofs
&& pgofs
<= end_fofs
) {
86 unsigned int blkbits
= inode
->i_sb
->s_blocksize_bits
;
89 clear_buffer_new(bh_result
);
90 map_bh(bh_result
, inode
->i_sb
,
91 start_blkaddr
+ pgofs
- start_fofs
);
92 count
= end_fofs
- pgofs
+ 1;
93 if (count
< (UINT_MAX
>> blkbits
))
94 bh_result
->b_size
= (count
<< blkbits
);
96 bh_result
->b_size
= UINT_MAX
;
99 read_unlock(&fi
->ext
.ext_lock
);
102 read_unlock(&fi
->ext
.ext_lock
);
106 void update_extent_cache(block_t blk_addr
, struct dnode_of_data
*dn
)
108 struct f2fs_inode_info
*fi
= F2FS_I(dn
->inode
);
109 pgoff_t fofs
, start_fofs
, end_fofs
;
110 block_t start_blkaddr
, end_blkaddr
;
112 BUG_ON(blk_addr
== NEW_ADDR
);
113 fofs
= start_bidx_of_node(ofs_of_node(dn
->node_page
)) + dn
->ofs_in_node
;
115 /* Update the page address in the parent node */
116 __set_data_blkaddr(dn
, blk_addr
);
118 write_lock(&fi
->ext
.ext_lock
);
120 start_fofs
= fi
->ext
.fofs
;
121 end_fofs
= fi
->ext
.fofs
+ fi
->ext
.len
- 1;
122 start_blkaddr
= fi
->ext
.blk_addr
;
123 end_blkaddr
= fi
->ext
.blk_addr
+ fi
->ext
.len
- 1;
125 /* Drop and initialize the matched extent */
126 if (fi
->ext
.len
== 1 && fofs
== start_fofs
)
130 if (fi
->ext
.len
== 0) {
131 if (blk_addr
!= NULL_ADDR
) {
133 fi
->ext
.blk_addr
= blk_addr
;
140 if (fofs
== start_fofs
- 1 && blk_addr
== start_blkaddr
- 1) {
148 if (fofs
== end_fofs
+ 1 && blk_addr
== end_blkaddr
+ 1) {
153 /* Split the existing extent */
154 if (fi
->ext
.len
> 1 &&
155 fofs
>= start_fofs
&& fofs
<= end_fofs
) {
156 if ((end_fofs
- fofs
) < (fi
->ext
.len
>> 1)) {
157 fi
->ext
.len
= fofs
- start_fofs
;
159 fi
->ext
.fofs
= fofs
+ 1;
160 fi
->ext
.blk_addr
= start_blkaddr
+
161 fofs
- start_fofs
+ 1;
162 fi
->ext
.len
-= fofs
- start_fofs
+ 1;
166 write_unlock(&fi
->ext
.ext_lock
);
170 write_unlock(&fi
->ext
.ext_lock
);
175 struct page
*find_data_page(struct inode
*inode
, pgoff_t index
)
177 struct f2fs_sb_info
*sbi
= F2FS_SB(inode
->i_sb
);
178 struct address_space
*mapping
= inode
->i_mapping
;
179 struct dnode_of_data dn
;
183 page
= find_get_page(mapping
, index
);
184 if (page
&& PageUptodate(page
))
186 f2fs_put_page(page
, 0);
188 set_new_dnode(&dn
, inode
, NULL
, NULL
, 0);
189 err
= get_dnode_of_data(&dn
, index
, LOOKUP_NODE
);
194 if (dn
.data_blkaddr
== NULL_ADDR
)
195 return ERR_PTR(-ENOENT
);
197 /* By fallocate(), there is no cached page, but with NEW_ADDR */
198 if (dn
.data_blkaddr
== NEW_ADDR
)
199 return ERR_PTR(-EINVAL
);
201 page
= grab_cache_page(mapping
, index
);
203 return ERR_PTR(-ENOMEM
);
205 if (PageUptodate(page
)) {
210 err
= f2fs_readpage(sbi
, page
, dn
.data_blkaddr
, READ_SYNC
);
211 wait_on_page_locked(page
);
212 if (!PageUptodate(page
)) {
213 f2fs_put_page(page
, 0);
214 return ERR_PTR(-EIO
);
220 * If it tries to access a hole, return an error.
221 * Because, the callers, functions in dir.c and GC, should be able to know
222 * whether this page exists or not.
224 struct page
*get_lock_data_page(struct inode
*inode
, pgoff_t index
)
226 struct f2fs_sb_info
*sbi
= F2FS_SB(inode
->i_sb
);
227 struct address_space
*mapping
= inode
->i_mapping
;
228 struct dnode_of_data dn
;
232 set_new_dnode(&dn
, inode
, NULL
, NULL
, 0);
233 err
= get_dnode_of_data(&dn
, index
, LOOKUP_NODE
);
238 if (dn
.data_blkaddr
== NULL_ADDR
)
239 return ERR_PTR(-ENOENT
);
241 page
= grab_cache_page(mapping
, index
);
243 return ERR_PTR(-ENOMEM
);
245 if (PageUptodate(page
))
248 BUG_ON(dn
.data_blkaddr
== NEW_ADDR
);
249 BUG_ON(dn
.data_blkaddr
== NULL_ADDR
);
251 err
= f2fs_readpage(sbi
, page
, dn
.data_blkaddr
, READ_SYNC
);
256 if (!PageUptodate(page
)) {
257 f2fs_put_page(page
, 1);
258 return ERR_PTR(-EIO
);
264 * Caller ensures that this data page is never allocated.
265 * A new zero-filled data page is allocated in the page cache.
267 * Also, caller should grab and release a mutex by calling mutex_lock_op() and
270 struct page
*get_new_data_page(struct inode
*inode
, pgoff_t index
,
273 struct f2fs_sb_info
*sbi
= F2FS_SB(inode
->i_sb
);
274 struct address_space
*mapping
= inode
->i_mapping
;
276 struct dnode_of_data dn
;
279 set_new_dnode(&dn
, inode
, NULL
, NULL
, 0);
280 err
= get_dnode_of_data(&dn
, index
, ALLOC_NODE
);
284 if (dn
.data_blkaddr
== NULL_ADDR
) {
285 if (reserve_new_block(&dn
)) {
287 return ERR_PTR(-ENOSPC
);
292 page
= grab_cache_page(mapping
, index
);
294 return ERR_PTR(-ENOMEM
);
296 if (PageUptodate(page
))
299 if (dn
.data_blkaddr
== NEW_ADDR
) {
300 zero_user_segment(page
, 0, PAGE_CACHE_SIZE
);
301 SetPageUptodate(page
);
303 err
= f2fs_readpage(sbi
, page
, dn
.data_blkaddr
, READ_SYNC
);
307 if (!PageUptodate(page
)) {
308 f2fs_put_page(page
, 1);
309 return ERR_PTR(-EIO
);
314 i_size_read(inode
) < ((index
+ 1) << PAGE_CACHE_SHIFT
)) {
315 i_size_write(inode
, ((index
+ 1) << PAGE_CACHE_SHIFT
));
316 mark_inode_dirty_sync(inode
);
321 static void read_end_io(struct bio
*bio
, int err
)
323 const int uptodate
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
324 struct bio_vec
*bvec
= bio
->bi_io_vec
+ bio
->bi_vcnt
- 1;
327 struct page
*page
= bvec
->bv_page
;
329 if (--bvec
>= bio
->bi_io_vec
)
330 prefetchw(&bvec
->bv_page
->flags
);
333 SetPageUptodate(page
);
335 ClearPageUptodate(page
);
339 } while (bvec
>= bio
->bi_io_vec
);
340 kfree(bio
->bi_private
);
345 * Fill the locked page with data located in the block address.
346 * Return unlocked page.
348 int f2fs_readpage(struct f2fs_sb_info
*sbi
, struct page
*page
,
349 block_t blk_addr
, int type
)
351 struct block_device
*bdev
= sbi
->sb
->s_bdev
;
354 trace_f2fs_readpage(page
, blk_addr
, type
);
356 down_read(&sbi
->bio_sem
);
358 /* Allocate a new bio */
359 bio
= f2fs_bio_alloc(bdev
, 1);
361 /* Initialize the bio */
362 bio
->bi_sector
= SECTOR_FROM_BLOCK(sbi
, blk_addr
);
363 bio
->bi_end_io
= read_end_io
;
365 if (bio_add_page(bio
, page
, PAGE_CACHE_SIZE
, 0) < PAGE_CACHE_SIZE
) {
366 kfree(bio
->bi_private
);
368 up_read(&sbi
->bio_sem
);
369 f2fs_put_page(page
, 1);
373 submit_bio(type
, bio
);
374 up_read(&sbi
->bio_sem
);
379 * This function should be used by the data read flow only where it
380 * does not check the "create" flag that indicates block allocation.
381 * The reason for this special functionality is to exploit VFS readahead
384 static int get_data_block_ro(struct inode
*inode
, sector_t iblock
,
385 struct buffer_head
*bh_result
, int create
)
387 unsigned int blkbits
= inode
->i_sb
->s_blocksize_bits
;
388 unsigned maxblocks
= bh_result
->b_size
>> blkbits
;
389 struct dnode_of_data dn
;
393 /* Get the page offset from the block offset(iblock) */
394 pgofs
= (pgoff_t
)(iblock
>> (PAGE_CACHE_SHIFT
- blkbits
));
396 if (check_extent_cache(inode
, pgofs
, bh_result
)) {
397 trace_f2fs_get_data_block(inode
, iblock
, bh_result
, 0);
401 /* When reading holes, we need its node page */
402 set_new_dnode(&dn
, inode
, NULL
, NULL
, 0);
403 err
= get_dnode_of_data(&dn
, pgofs
, LOOKUP_NODE_RA
);
405 trace_f2fs_get_data_block(inode
, iblock
, bh_result
, err
);
406 return (err
== -ENOENT
) ? 0 : err
;
409 /* It does not support data allocation */
412 if (dn
.data_blkaddr
!= NEW_ADDR
&& dn
.data_blkaddr
!= NULL_ADDR
) {
414 unsigned int end_offset
;
416 end_offset
= IS_INODE(dn
.node_page
) ?
420 clear_buffer_new(bh_result
);
422 /* Give more consecutive addresses for the read ahead */
423 for (i
= 0; i
< end_offset
- dn
.ofs_in_node
; i
++)
424 if (((datablock_addr(dn
.node_page
,
426 != (dn
.data_blkaddr
+ i
)) || maxblocks
== i
)
428 map_bh(bh_result
, inode
->i_sb
, dn
.data_blkaddr
);
429 bh_result
->b_size
= (i
<< blkbits
);
432 trace_f2fs_get_data_block(inode
, iblock
, bh_result
, 0);
436 static int f2fs_read_data_page(struct file
*file
, struct page
*page
)
438 return mpage_readpage(page
, get_data_block_ro
);
441 static int f2fs_read_data_pages(struct file
*file
,
442 struct address_space
*mapping
,
443 struct list_head
*pages
, unsigned nr_pages
)
445 return mpage_readpages(mapping
, pages
, nr_pages
, get_data_block_ro
);
448 int do_write_data_page(struct page
*page
)
450 struct inode
*inode
= page
->mapping
->host
;
451 block_t old_blk_addr
, new_blk_addr
;
452 struct dnode_of_data dn
;
455 set_new_dnode(&dn
, inode
, NULL
, NULL
, 0);
456 err
= get_dnode_of_data(&dn
, page
->index
, LOOKUP_NODE
);
460 old_blk_addr
= dn
.data_blkaddr
;
462 /* This page is already truncated */
463 if (old_blk_addr
== NULL_ADDR
)
466 set_page_writeback(page
);
469 * If current allocation needs SSR,
470 * it had better in-place writes for updated data.
472 if (old_blk_addr
!= NEW_ADDR
&& !is_cold_data(page
) &&
473 need_inplace_update(inode
)) {
474 rewrite_data_page(F2FS_SB(inode
->i_sb
), page
,
477 write_data_page(inode
, page
, &dn
,
478 old_blk_addr
, &new_blk_addr
);
479 update_extent_cache(new_blk_addr
, &dn
);
486 static int f2fs_write_data_page(struct page
*page
,
487 struct writeback_control
*wbc
)
489 struct inode
*inode
= page
->mapping
->host
;
490 struct f2fs_sb_info
*sbi
= F2FS_SB(inode
->i_sb
);
491 loff_t i_size
= i_size_read(inode
);
492 const pgoff_t end_index
= ((unsigned long long) i_size
)
495 bool need_balance_fs
= false;
498 if (page
->index
< end_index
)
502 * If the offset is out-of-range of file size,
503 * this page does not have to be written to disk.
505 offset
= i_size
& (PAGE_CACHE_SIZE
- 1);
506 if ((page
->index
>= end_index
+ 1) || !offset
) {
507 if (S_ISDIR(inode
->i_mode
)) {
508 dec_page_count(sbi
, F2FS_DIRTY_DENTS
);
509 inode_dec_dirty_dents(inode
);
514 zero_user_segment(page
, offset
, PAGE_CACHE_SIZE
);
516 if (sbi
->por_doing
) {
517 err
= AOP_WRITEPAGE_ACTIVATE
;
521 /* Dentry blocks are controlled by checkpoint */
522 if (S_ISDIR(inode
->i_mode
)) {
523 dec_page_count(sbi
, F2FS_DIRTY_DENTS
);
524 inode_dec_dirty_dents(inode
);
525 err
= do_write_data_page(page
);
527 int ilock
= mutex_lock_op(sbi
);
528 err
= do_write_data_page(page
);
529 mutex_unlock_op(sbi
, ilock
);
530 need_balance_fs
= true;
537 if (wbc
->for_reclaim
)
538 f2fs_submit_bio(sbi
, DATA
, true);
540 clear_cold_data(page
);
544 f2fs_balance_fs(sbi
);
548 wbc
->pages_skipped
++;
549 set_page_dirty(page
);
553 #define MAX_DESIRED_PAGES_WP 4096
555 static int __f2fs_writepage(struct page
*page
, struct writeback_control
*wbc
,
558 struct address_space
*mapping
= data
;
559 int ret
= mapping
->a_ops
->writepage(page
, wbc
);
560 mapping_set_error(mapping
, ret
);
564 static int f2fs_write_data_pages(struct address_space
*mapping
,
565 struct writeback_control
*wbc
)
567 struct inode
*inode
= mapping
->host
;
568 struct f2fs_sb_info
*sbi
= F2FS_SB(inode
->i_sb
);
570 long excess_nrtw
= 0, desired_nrtw
;
572 /* deal with chardevs and other special file */
573 if (!mapping
->a_ops
->writepage
)
576 if (wbc
->nr_to_write
< MAX_DESIRED_PAGES_WP
) {
577 desired_nrtw
= MAX_DESIRED_PAGES_WP
;
578 excess_nrtw
= desired_nrtw
- wbc
->nr_to_write
;
579 wbc
->nr_to_write
= desired_nrtw
;
582 if (!S_ISDIR(inode
->i_mode
))
583 mutex_lock(&sbi
->writepages
);
584 ret
= write_cache_pages(mapping
, wbc
, __f2fs_writepage
, mapping
);
585 if (!S_ISDIR(inode
->i_mode
))
586 mutex_unlock(&sbi
->writepages
);
587 f2fs_submit_bio(sbi
, DATA
, (wbc
->sync_mode
== WB_SYNC_ALL
));
589 remove_dirty_dir_inode(inode
);
591 wbc
->nr_to_write
-= excess_nrtw
;
595 static int f2fs_write_begin(struct file
*file
, struct address_space
*mapping
,
596 loff_t pos
, unsigned len
, unsigned flags
,
597 struct page
**pagep
, void **fsdata
)
599 struct inode
*inode
= mapping
->host
;
600 struct f2fs_sb_info
*sbi
= F2FS_SB(inode
->i_sb
);
602 pgoff_t index
= ((unsigned long long) pos
) >> PAGE_CACHE_SHIFT
;
603 struct dnode_of_data dn
;
607 /* for nobh_write_end */
610 f2fs_balance_fs(sbi
);
612 page
= grab_cache_page_write_begin(mapping
, index
, flags
);
617 ilock
= mutex_lock_op(sbi
);
619 set_new_dnode(&dn
, inode
, NULL
, NULL
, 0);
620 err
= get_dnode_of_data(&dn
, index
, ALLOC_NODE
);
624 if (dn
.data_blkaddr
== NULL_ADDR
)
625 err
= reserve_new_block(&dn
);
631 mutex_unlock_op(sbi
, ilock
);
633 if ((len
== PAGE_CACHE_SIZE
) || PageUptodate(page
))
636 if ((pos
& PAGE_CACHE_MASK
) >= i_size_read(inode
)) {
637 unsigned start
= pos
& (PAGE_CACHE_SIZE
- 1);
638 unsigned end
= start
+ len
;
640 /* Reading beyond i_size is simple: memset to zero */
641 zero_user_segments(page
, 0, start
, end
, PAGE_CACHE_SIZE
);
645 if (dn
.data_blkaddr
== NEW_ADDR
) {
646 zero_user_segment(page
, 0, PAGE_CACHE_SIZE
);
648 err
= f2fs_readpage(sbi
, page
, dn
.data_blkaddr
, READ_SYNC
);
652 if (!PageUptodate(page
)) {
653 f2fs_put_page(page
, 1);
658 SetPageUptodate(page
);
659 clear_cold_data(page
);
663 mutex_unlock_op(sbi
, ilock
);
664 f2fs_put_page(page
, 1);
668 static ssize_t
f2fs_direct_IO(int rw
, struct kiocb
*iocb
,
669 const struct iovec
*iov
, loff_t offset
, unsigned long nr_segs
)
671 struct file
*file
= iocb
->ki_filp
;
672 struct inode
*inode
= file
->f_mapping
->host
;
677 /* Needs synchronization with the cleaner */
678 return blockdev_direct_IO(rw
, iocb
, inode
, iov
, offset
, nr_segs
,
682 static void f2fs_invalidate_data_page(struct page
*page
, unsigned long offset
)
684 struct inode
*inode
= page
->mapping
->host
;
685 struct f2fs_sb_info
*sbi
= F2FS_SB(inode
->i_sb
);
686 if (S_ISDIR(inode
->i_mode
) && PageDirty(page
)) {
687 dec_page_count(sbi
, F2FS_DIRTY_DENTS
);
688 inode_dec_dirty_dents(inode
);
690 ClearPagePrivate(page
);
693 static int f2fs_release_data_page(struct page
*page
, gfp_t wait
)
695 ClearPagePrivate(page
);
699 static int f2fs_set_data_page_dirty(struct page
*page
)
701 struct address_space
*mapping
= page
->mapping
;
702 struct inode
*inode
= mapping
->host
;
704 SetPageUptodate(page
);
705 if (!PageDirty(page
)) {
706 __set_page_dirty_nobuffers(page
);
707 set_dirty_dir_page(inode
, page
);
713 static sector_t
f2fs_bmap(struct address_space
*mapping
, sector_t block
)
715 return generic_block_bmap(mapping
, block
, get_data_block_ro
);
718 const struct address_space_operations f2fs_dblock_aops
= {
719 .readpage
= f2fs_read_data_page
,
720 .readpages
= f2fs_read_data_pages
,
721 .writepage
= f2fs_write_data_page
,
722 .writepages
= f2fs_write_data_pages
,
723 .write_begin
= f2fs_write_begin
,
724 .write_end
= nobh_write_end
,
725 .set_page_dirty
= f2fs_set_data_page_dirty
,
726 .invalidatepage
= f2fs_invalidate_data_page
,
727 .releasepage
= f2fs_release_data_page
,
728 .direct_IO
= f2fs_direct_IO
,