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f2fs: check s_dirty under cp_mutex
[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / fs / f2fs / data.c
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1/*
2 * fs/f2fs/data.c
3 *
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
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.
10 */
11#include <linux/fs.h>
12#include <linux/f2fs_fs.h>
13#include <linux/buffer_head.h>
14#include <linux/mpage.h>
15#include <linux/aio.h>
16#include <linux/writeback.h>
17#include <linux/backing-dev.h>
18#include <linux/blkdev.h>
19#include <linux/bio.h>
20#include <linux/prefetch.h>
21
22#include "f2fs.h"
23#include "node.h"
24#include "segment.h"
25#include <trace/events/f2fs.h>
26
27static void f2fs_read_end_io(struct bio *bio, int err)
28{
29 struct bio_vec *bvec;
30 int i;
31
32 bio_for_each_segment_all(bvec, bio, i) {
33 struct page *page = bvec->bv_page;
34
35 if (!err) {
36 SetPageUptodate(page);
37 } else {
38 ClearPageUptodate(page);
39 SetPageError(page);
40 }
41 unlock_page(page);
42 }
43 bio_put(bio);
44}
45
46static void f2fs_write_end_io(struct bio *bio, int err)
47{
48 struct f2fs_sb_info *sbi = bio->bi_private;
49 struct bio_vec *bvec;
50 int i;
51
52 bio_for_each_segment_all(bvec, bio, i) {
53 struct page *page = bvec->bv_page;
54
55 if (unlikely(err)) {
56 SetPageError(page);
57 set_bit(AS_EIO, &page->mapping->flags);
58 f2fs_stop_checkpoint(sbi);
59 }
60 end_page_writeback(page);
61 dec_page_count(sbi, F2FS_WRITEBACK);
62 }
63
64 if (sbi->wait_io) {
65 complete(sbi->wait_io);
66 sbi->wait_io = NULL;
67 }
68
69 if (!get_pages(sbi, F2FS_WRITEBACK) &&
70 !list_empty(&sbi->cp_wait.task_list))
71 wake_up(&sbi->cp_wait);
72
73 bio_put(bio);
74}
75
76/*
77 * Low-level block read/write IO operations.
78 */
79static struct bio *__bio_alloc(struct f2fs_sb_info *sbi, block_t blk_addr,
80 int npages, bool is_read)
81{
82 struct bio *bio;
83
84 /* No failure on bio allocation */
85 bio = bio_alloc(GFP_NOIO, npages);
86
87 bio->bi_bdev = sbi->sb->s_bdev;
88 bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr);
89 bio->bi_end_io = is_read ? f2fs_read_end_io : f2fs_write_end_io;
90 bio->bi_private = sbi;
91
92 return bio;
93}
94
95static void __submit_merged_bio(struct f2fs_bio_info *io)
96{
97 struct f2fs_io_info *fio = &io->fio;
98 int rw;
99
100 if (!io->bio)
101 return;
102
103 rw = fio->rw;
104
105 if (is_read_io(rw)) {
106 trace_f2fs_submit_read_bio(io->sbi->sb, rw,
107 fio->type, io->bio);
108 submit_bio(rw, io->bio);
109 } else {
110 trace_f2fs_submit_write_bio(io->sbi->sb, rw,
111 fio->type, io->bio);
112 /*
113 * META_FLUSH is only from the checkpoint procedure, and we
114 * should wait this metadata bio for FS consistency.
115 */
116 if (fio->type == META_FLUSH) {
117 DECLARE_COMPLETION_ONSTACK(wait);
118 io->sbi->wait_io = &wait;
119 submit_bio(rw, io->bio);
120 wait_for_completion(&wait);
121 } else {
122 submit_bio(rw, io->bio);
123 }
124 }
125
126 io->bio = NULL;
127}
128
129void f2fs_submit_merged_bio(struct f2fs_sb_info *sbi,
130 enum page_type type, int rw)
131{
132 enum page_type btype = PAGE_TYPE_OF_BIO(type);
133 struct f2fs_bio_info *io;
134
135 io = is_read_io(rw) ? &sbi->read_io : &sbi->write_io[btype];
136
137 down_write(&io->io_rwsem);
138
139 /* change META to META_FLUSH in the checkpoint procedure */
140 if (type >= META_FLUSH) {
141 io->fio.type = META_FLUSH;
142 if (test_opt(sbi, NOBARRIER))
143 io->fio.rw = WRITE_FLUSH | REQ_META | REQ_PRIO;
144 else
145 io->fio.rw = WRITE_FLUSH_FUA | REQ_META | REQ_PRIO;
146 }
147 __submit_merged_bio(io);
148 up_write(&io->io_rwsem);
149}
150
151/*
152 * Fill the locked page with data located in the block address.
153 * Return unlocked page.
154 */
155int f2fs_submit_page_bio(struct f2fs_sb_info *sbi, struct page *page,
156 block_t blk_addr, int rw)
157{
158 struct bio *bio;
159
160 trace_f2fs_submit_page_bio(page, blk_addr, rw);
161
162 /* Allocate a new bio */
163 bio = __bio_alloc(sbi, blk_addr, 1, is_read_io(rw));
164
165 if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) {
166 bio_put(bio);
167 f2fs_put_page(page, 1);
168 return -EFAULT;
169 }
170
171 submit_bio(rw, bio);
172 return 0;
173}
174
175void f2fs_submit_page_mbio(struct f2fs_sb_info *sbi, struct page *page,
176 block_t blk_addr, struct f2fs_io_info *fio)
177{
178 enum page_type btype = PAGE_TYPE_OF_BIO(fio->type);
179 struct f2fs_bio_info *io;
180 bool is_read = is_read_io(fio->rw);
181
182 io = is_read ? &sbi->read_io : &sbi->write_io[btype];
183
184 verify_block_addr(sbi, blk_addr);
185
186 down_write(&io->io_rwsem);
187
188 if (!is_read)
189 inc_page_count(sbi, F2FS_WRITEBACK);
190
191 if (io->bio && (io->last_block_in_bio != blk_addr - 1 ||
192 io->fio.rw != fio->rw))
193 __submit_merged_bio(io);
194alloc_new:
195 if (io->bio == NULL) {
196 int bio_blocks = MAX_BIO_BLOCKS(max_hw_blocks(sbi));
197
198 io->bio = __bio_alloc(sbi, blk_addr, bio_blocks, is_read);
199 io->fio = *fio;
200 }
201
202 if (bio_add_page(io->bio, page, PAGE_CACHE_SIZE, 0) <
203 PAGE_CACHE_SIZE) {
204 __submit_merged_bio(io);
205 goto alloc_new;
206 }
207
208 io->last_block_in_bio = blk_addr;
209
210 up_write(&io->io_rwsem);
211 trace_f2fs_submit_page_mbio(page, fio->rw, fio->type, blk_addr);
212}
213
214/*
215 * Lock ordering for the change of data block address:
216 * ->data_page
217 * ->node_page
218 * update block addresses in the node page
219 */
220static void __set_data_blkaddr(struct dnode_of_data *dn, block_t new_addr)
221{
222 struct f2fs_node *rn;
223 __le32 *addr_array;
224 struct page *node_page = dn->node_page;
225 unsigned int ofs_in_node = dn->ofs_in_node;
226
227 f2fs_wait_on_page_writeback(node_page, NODE);
228
229 rn = F2FS_NODE(node_page);
230
231 /* Get physical address of data block */
232 addr_array = blkaddr_in_node(rn);
233 addr_array[ofs_in_node] = cpu_to_le32(new_addr);
234 set_page_dirty(node_page);
235}
236
237int reserve_new_block(struct dnode_of_data *dn)
238{
239 struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
240
241 if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)))
242 return -EPERM;
243 if (unlikely(!inc_valid_block_count(sbi, dn->inode, 1)))
244 return -ENOSPC;
245
246 trace_f2fs_reserve_new_block(dn->inode, dn->nid, dn->ofs_in_node);
247
248 __set_data_blkaddr(dn, NEW_ADDR);
249 dn->data_blkaddr = NEW_ADDR;
250 mark_inode_dirty(dn->inode);
251 sync_inode_page(dn);
252 return 0;
253}
254
255int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index)
256{
257 bool need_put = dn->inode_page ? false : true;
258 int err;
259
260 /* if inode_page exists, index should be zero */
261 f2fs_bug_on(!need_put && index);
262
263 err = get_dnode_of_data(dn, index, ALLOC_NODE);
264 if (err)
265 return err;
266
267 if (dn->data_blkaddr == NULL_ADDR)
268 err = reserve_new_block(dn);
269 if (err || need_put)
270 f2fs_put_dnode(dn);
271 return err;
272}
273
274static int check_extent_cache(struct inode *inode, pgoff_t pgofs,
275 struct buffer_head *bh_result)
276{
277 struct f2fs_inode_info *fi = F2FS_I(inode);
278 pgoff_t start_fofs, end_fofs;
279 block_t start_blkaddr;
280
281 if (is_inode_flag_set(fi, FI_NO_EXTENT))
282 return 0;
283
284 read_lock(&fi->ext.ext_lock);
285 if (fi->ext.len == 0) {
286 read_unlock(&fi->ext.ext_lock);
287 return 0;
288 }
289
290 stat_inc_total_hit(inode->i_sb);
291
292 start_fofs = fi->ext.fofs;
293 end_fofs = fi->ext.fofs + fi->ext.len - 1;
294 start_blkaddr = fi->ext.blk_addr;
295
296 if (pgofs >= start_fofs && pgofs <= end_fofs) {
297 unsigned int blkbits = inode->i_sb->s_blocksize_bits;
298 size_t count;
299
300 clear_buffer_new(bh_result);
301 map_bh(bh_result, inode->i_sb,
302 start_blkaddr + pgofs - start_fofs);
303 count = end_fofs - pgofs + 1;
304 if (count < (UINT_MAX >> blkbits))
305 bh_result->b_size = (count << blkbits);
306 else
307 bh_result->b_size = UINT_MAX;
308
309 stat_inc_read_hit(inode->i_sb);
310 read_unlock(&fi->ext.ext_lock);
311 return 1;
312 }
313 read_unlock(&fi->ext.ext_lock);
314 return 0;
315}
316
317void update_extent_cache(block_t blk_addr, struct dnode_of_data *dn)
318{
319 struct f2fs_inode_info *fi = F2FS_I(dn->inode);
320 pgoff_t fofs, start_fofs, end_fofs;
321 block_t start_blkaddr, end_blkaddr;
322 int need_update = true;
323
324 f2fs_bug_on(blk_addr == NEW_ADDR);
325 fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) +
326 dn->ofs_in_node;
327
328 /* Update the page address in the parent node */
329 __set_data_blkaddr(dn, blk_addr);
330
331 if (is_inode_flag_set(fi, FI_NO_EXTENT))
332 return;
333
334 write_lock(&fi->ext.ext_lock);
335
336 start_fofs = fi->ext.fofs;
337 end_fofs = fi->ext.fofs + fi->ext.len - 1;
338 start_blkaddr = fi->ext.blk_addr;
339 end_blkaddr = fi->ext.blk_addr + fi->ext.len - 1;
340
341 /* Drop and initialize the matched extent */
342 if (fi->ext.len == 1 && fofs == start_fofs)
343 fi->ext.len = 0;
344
345 /* Initial extent */
346 if (fi->ext.len == 0) {
347 if (blk_addr != NULL_ADDR) {
348 fi->ext.fofs = fofs;
349 fi->ext.blk_addr = blk_addr;
350 fi->ext.len = 1;
351 }
352 goto end_update;
353 }
354
355 /* Front merge */
356 if (fofs == start_fofs - 1 && blk_addr == start_blkaddr - 1) {
357 fi->ext.fofs--;
358 fi->ext.blk_addr--;
359 fi->ext.len++;
360 goto end_update;
361 }
362
363 /* Back merge */
364 if (fofs == end_fofs + 1 && blk_addr == end_blkaddr + 1) {
365 fi->ext.len++;
366 goto end_update;
367 }
368
369 /* Split the existing extent */
370 if (fi->ext.len > 1 &&
371 fofs >= start_fofs && fofs <= end_fofs) {
372 if ((end_fofs - fofs) < (fi->ext.len >> 1)) {
373 fi->ext.len = fofs - start_fofs;
374 } else {
375 fi->ext.fofs = fofs + 1;
376 fi->ext.blk_addr = start_blkaddr +
377 fofs - start_fofs + 1;
378 fi->ext.len -= fofs - start_fofs + 1;
379 }
380 } else {
381 need_update = false;
382 }
383
384 /* Finally, if the extent is very fragmented, let's drop the cache. */
385 if (fi->ext.len < F2FS_MIN_EXTENT_LEN) {
386 fi->ext.len = 0;
387 set_inode_flag(fi, FI_NO_EXTENT);
388 need_update = true;
389 }
390end_update:
391 write_unlock(&fi->ext.ext_lock);
392 if (need_update)
393 sync_inode_page(dn);
394 return;
395}
396
397struct page *find_data_page(struct inode *inode, pgoff_t index, bool sync)
398{
399 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
400 struct address_space *mapping = inode->i_mapping;
401 struct dnode_of_data dn;
402 struct page *page;
403 int err;
404
405 page = find_get_page(mapping, index);
406 if (page && PageUptodate(page))
407 return page;
408 f2fs_put_page(page, 0);
409
410 set_new_dnode(&dn, inode, NULL, NULL, 0);
411 err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
412 if (err)
413 return ERR_PTR(err);
414 f2fs_put_dnode(&dn);
415
416 if (dn.data_blkaddr == NULL_ADDR)
417 return ERR_PTR(-ENOENT);
418
419 /* By fallocate(), there is no cached page, but with NEW_ADDR */
420 if (unlikely(dn.data_blkaddr == NEW_ADDR))
421 return ERR_PTR(-EINVAL);
422
423 page = grab_cache_page(mapping, index);
424 if (!page)
425 return ERR_PTR(-ENOMEM);
426
427 if (PageUptodate(page)) {
428 unlock_page(page);
429 return page;
430 }
431
432 err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr,
433 sync ? READ_SYNC : READA);
434 if (err)
435 return ERR_PTR(err);
436
437 if (sync) {
438 wait_on_page_locked(page);
439 if (unlikely(!PageUptodate(page))) {
440 f2fs_put_page(page, 0);
441 return ERR_PTR(-EIO);
442 }
443 }
444 return page;
445}
446
447/*
448 * If it tries to access a hole, return an error.
449 * Because, the callers, functions in dir.c and GC, should be able to know
450 * whether this page exists or not.
451 */
452struct page *get_lock_data_page(struct inode *inode, pgoff_t index)
453{
454 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
455 struct address_space *mapping = inode->i_mapping;
456 struct dnode_of_data dn;
457 struct page *page;
458 int err;
459
460repeat:
461 page = grab_cache_page(mapping, index);
462 if (!page)
463 return ERR_PTR(-ENOMEM);
464
465 set_new_dnode(&dn, inode, NULL, NULL, 0);
466 err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
467 if (err) {
468 f2fs_put_page(page, 1);
469 return ERR_PTR(err);
470 }
471 f2fs_put_dnode(&dn);
472
473 if (unlikely(dn.data_blkaddr == NULL_ADDR)) {
474 f2fs_put_page(page, 1);
475 return ERR_PTR(-ENOENT);
476 }
477
478 if (PageUptodate(page))
479 return page;
480
481 /*
482 * A new dentry page is allocated but not able to be written, since its
483 * new inode page couldn't be allocated due to -ENOSPC.
484 * In such the case, its blkaddr can be remained as NEW_ADDR.
485 * see, f2fs_add_link -> get_new_data_page -> init_inode_metadata.
486 */
487 if (dn.data_blkaddr == NEW_ADDR) {
488 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
489 SetPageUptodate(page);
490 return page;
491 }
492
493 err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr, READ_SYNC);
494 if (err)
495 return ERR_PTR(err);
496
497 lock_page(page);
498 if (unlikely(!PageUptodate(page))) {
499 f2fs_put_page(page, 1);
500 return ERR_PTR(-EIO);
501 }
502 if (unlikely(page->mapping != mapping)) {
503 f2fs_put_page(page, 1);
504 goto repeat;
505 }
506 return page;
507}
508
509/*
510 * Caller ensures that this data page is never allocated.
511 * A new zero-filled data page is allocated in the page cache.
512 *
513 * Also, caller should grab and release a rwsem by calling f2fs_lock_op() and
514 * f2fs_unlock_op().
515 * Note that, ipage is set only by make_empty_dir.
516 */
517struct page *get_new_data_page(struct inode *inode,
518 struct page *ipage, pgoff_t index, bool new_i_size)
519{
520 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
521 struct address_space *mapping = inode->i_mapping;
522 struct page *page;
523 struct dnode_of_data dn;
524 int err;
525
526 set_new_dnode(&dn, inode, ipage, NULL, 0);
527 err = f2fs_reserve_block(&dn, index);
528 if (err)
529 return ERR_PTR(err);
530repeat:
531 page = grab_cache_page(mapping, index);
532 if (!page) {
533 err = -ENOMEM;
534 goto put_err;
535 }
536
537 if (PageUptodate(page))
538 return page;
539
540 if (dn.data_blkaddr == NEW_ADDR) {
541 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
542 SetPageUptodate(page);
543 } else {
544 err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr,
545 READ_SYNC);
546 if (err)
547 goto put_err;
548
549 lock_page(page);
550 if (unlikely(!PageUptodate(page))) {
551 f2fs_put_page(page, 1);
552 err = -EIO;
553 goto put_err;
554 }
555 if (unlikely(page->mapping != mapping)) {
556 f2fs_put_page(page, 1);
557 goto repeat;
558 }
559 }
560
561 if (new_i_size &&
562 i_size_read(inode) < ((index + 1) << PAGE_CACHE_SHIFT)) {
563 i_size_write(inode, ((index + 1) << PAGE_CACHE_SHIFT));
564 /* Only the directory inode sets new_i_size */
565 set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR);
566 }
567 return page;
568
569put_err:
570 f2fs_put_dnode(&dn);
571 return ERR_PTR(err);
572}
573
574static int __allocate_data_block(struct dnode_of_data *dn)
575{
576 struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
577 struct f2fs_summary sum;
578 block_t new_blkaddr;
579 struct node_info ni;
580 int type;
581
582 if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)))
583 return -EPERM;
584 if (unlikely(!inc_valid_block_count(sbi, dn->inode, 1)))
585 return -ENOSPC;
586
587 __set_data_blkaddr(dn, NEW_ADDR);
588 dn->data_blkaddr = NEW_ADDR;
589
590 get_node_info(sbi, dn->nid, &ni);
591 set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version);
592
593 type = CURSEG_WARM_DATA;
594
595 allocate_data_block(sbi, NULL, NULL_ADDR, &new_blkaddr, &sum, type);
596
597 /* direct IO doesn't use extent cache to maximize the performance */
598 set_inode_flag(F2FS_I(dn->inode), FI_NO_EXTENT);
599 update_extent_cache(new_blkaddr, dn);
600 clear_inode_flag(F2FS_I(dn->inode), FI_NO_EXTENT);
601
602 dn->data_blkaddr = new_blkaddr;
603 return 0;
604}
605
606/*
607 * get_data_block() now supported readahead/bmap/rw direct_IO with mapped bh.
608 * If original data blocks are allocated, then give them to blockdev.
609 * Otherwise,
610 * a. preallocate requested block addresses
611 * b. do not use extent cache for better performance
612 * c. give the block addresses to blockdev
613 */
614static int __get_data_block(struct inode *inode, sector_t iblock,
615 struct buffer_head *bh_result, int create, bool fiemap)
616{
617 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
618 unsigned int blkbits = inode->i_sb->s_blocksize_bits;
619 unsigned maxblocks = bh_result->b_size >> blkbits;
620 struct dnode_of_data dn;
621 int mode = create ? ALLOC_NODE : LOOKUP_NODE_RA;
622 pgoff_t pgofs, end_offset;
623 int err = 0, ofs = 1;
624 bool allocated = false;
625
626 /* Get the page offset from the block offset(iblock) */
627 pgofs = (pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits));
628
629 if (check_extent_cache(inode, pgofs, bh_result))
630 goto out;
631
632 if (create) {
633 f2fs_balance_fs(sbi);
634 f2fs_lock_op(sbi);
635 }
636
637 /* When reading holes, we need its node page */
638 set_new_dnode(&dn, inode, NULL, NULL, 0);
639 err = get_dnode_of_data(&dn, pgofs, mode);
640 if (err) {
641 if (err == -ENOENT)
642 err = 0;
643 goto unlock_out;
644 }
645 if (dn.data_blkaddr == NEW_ADDR && !fiemap)
646 goto put_out;
647
648 if (dn.data_blkaddr != NULL_ADDR) {
649 map_bh(bh_result, inode->i_sb, dn.data_blkaddr);
650 } else if (create) {
651 err = __allocate_data_block(&dn);
652 if (err)
653 goto put_out;
654 allocated = true;
655 map_bh(bh_result, inode->i_sb, dn.data_blkaddr);
656 } else {
657 goto put_out;
658 }
659
660 end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
661 bh_result->b_size = (((size_t)1) << blkbits);
662 dn.ofs_in_node++;
663 pgofs++;
664
665get_next:
666 if (dn.ofs_in_node >= end_offset) {
667 if (allocated)
668 sync_inode_page(&dn);
669 allocated = false;
670 f2fs_put_dnode(&dn);
671
672 set_new_dnode(&dn, inode, NULL, NULL, 0);
673 err = get_dnode_of_data(&dn, pgofs, mode);
674 if (err) {
675 if (err == -ENOENT)
676 err = 0;
677 goto unlock_out;
678 }
679 if (dn.data_blkaddr == NEW_ADDR && !fiemap)
680 goto put_out;
681
682 end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
683 }
684
685 if (maxblocks > (bh_result->b_size >> blkbits)) {
686 block_t blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node);
687 if (blkaddr == NULL_ADDR && create) {
688 err = __allocate_data_block(&dn);
689 if (err)
690 goto sync_out;
691 allocated = true;
692 blkaddr = dn.data_blkaddr;
693 }
694 /* Give more consecutive addresses for the readahead */
695 if (blkaddr == (bh_result->b_blocknr + ofs)) {
696 ofs++;
697 dn.ofs_in_node++;
698 pgofs++;
699 bh_result->b_size += (((size_t)1) << blkbits);
700 goto get_next;
701 }
702 }
703sync_out:
704 if (allocated)
705 sync_inode_page(&dn);
706put_out:
707 f2fs_put_dnode(&dn);
708unlock_out:
709 if (create)
710 f2fs_unlock_op(sbi);
711out:
712 trace_f2fs_get_data_block(inode, iblock, bh_result, err);
713 return err;
714}
715
716static int get_data_block(struct inode *inode, sector_t iblock,
717 struct buffer_head *bh_result, int create)
718{
719 return __get_data_block(inode, iblock, bh_result, create, false);
720}
721
722static int get_data_block_fiemap(struct inode *inode, sector_t iblock,
723 struct buffer_head *bh_result, int create)
724{
725 return __get_data_block(inode, iblock, bh_result, create, true);
726}
727
728int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
729 u64 start, u64 len)
730{
731 return generic_block_fiemap(inode, fieinfo,
732 start, len, get_data_block_fiemap);
733}
734
735static int f2fs_read_data_page(struct file *file, struct page *page)
736{
737 struct inode *inode = page->mapping->host;
738 int ret;
739
740 trace_f2fs_readpage(page, DATA);
741
742 /* If the file has inline data, try to read it directly */
743 if (f2fs_has_inline_data(inode))
744 ret = f2fs_read_inline_data(inode, page);
745 else
746 ret = mpage_readpage(page, get_data_block);
747
748 return ret;
749}
750
751static int f2fs_read_data_pages(struct file *file,
752 struct address_space *mapping,
753 struct list_head *pages, unsigned nr_pages)
754{
755 struct inode *inode = file->f_mapping->host;
756
757 /* If the file has inline data, skip readpages */
758 if (f2fs_has_inline_data(inode))
759 return 0;
760
761 return mpage_readpages(mapping, pages, nr_pages, get_data_block);
762}
763
764int do_write_data_page(struct page *page, struct f2fs_io_info *fio)
765{
766 struct inode *inode = page->mapping->host;
767 block_t old_blkaddr, new_blkaddr;
768 struct dnode_of_data dn;
769 int err = 0;
770
771 set_new_dnode(&dn, inode, NULL, NULL, 0);
772 err = get_dnode_of_data(&dn, page->index, LOOKUP_NODE);
773 if (err)
774 return err;
775
776 old_blkaddr = dn.data_blkaddr;
777
778 /* This page is already truncated */
779 if (old_blkaddr == NULL_ADDR)
780 goto out_writepage;
781
782 set_page_writeback(page);
783
784 /*
785 * If current allocation needs SSR,
786 * it had better in-place writes for updated data.
787 */
788 if (unlikely(old_blkaddr != NEW_ADDR &&
789 !is_cold_data(page) &&
790 need_inplace_update(inode))) {
791 rewrite_data_page(page, old_blkaddr, fio);
792 set_inode_flag(F2FS_I(inode), FI_UPDATE_WRITE);
793 } else {
794 write_data_page(page, &dn, &new_blkaddr, fio);
795 update_extent_cache(new_blkaddr, &dn);
796 set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
797 }
798out_writepage:
799 f2fs_put_dnode(&dn);
800 return err;
801}
802
803static int f2fs_write_data_page(struct page *page,
804 struct writeback_control *wbc)
805{
806 struct inode *inode = page->mapping->host;
807 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
808 loff_t i_size = i_size_read(inode);
809 const pgoff_t end_index = ((unsigned long long) i_size)
810 >> PAGE_CACHE_SHIFT;
811 unsigned offset = 0;
812 bool need_balance_fs = false;
813 int err = 0;
814 struct f2fs_io_info fio = {
815 .type = DATA,
816 .rw = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : WRITE,
817 };
818
819 trace_f2fs_writepage(page, DATA);
820
821 if (page->index < end_index)
822 goto write;
823
824 /*
825 * If the offset is out-of-range of file size,
826 * this page does not have to be written to disk.
827 */
828 offset = i_size & (PAGE_CACHE_SIZE - 1);
829 if ((page->index >= end_index + 1) || !offset)
830 goto out;
831
832 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
833write:
834 if (unlikely(sbi->por_doing))
835 goto redirty_out;
836
837 /* Dentry blocks are controlled by checkpoint */
838 if (S_ISDIR(inode->i_mode)) {
839 err = do_write_data_page(page, &fio);
840 goto done;
841 }
842
843 if (!wbc->for_reclaim)
844 need_balance_fs = true;
845 else if (has_not_enough_free_secs(sbi, 0))
846 goto redirty_out;
847
848 f2fs_lock_op(sbi);
849 if (f2fs_has_inline_data(inode) || f2fs_may_inline(inode))
850 err = f2fs_write_inline_data(inode, page, offset);
851 else
852 err = do_write_data_page(page, &fio);
853 f2fs_unlock_op(sbi);
854done:
855 if (err && err != -ENOENT)
856 goto redirty_out;
857
858 clear_cold_data(page);
859out:
860 inode_dec_dirty_dents(inode);
861 unlock_page(page);
862 if (need_balance_fs)
863 f2fs_balance_fs(sbi);
864 if (wbc->for_reclaim)
865 f2fs_submit_merged_bio(sbi, DATA, WRITE);
866 return 0;
867
868redirty_out:
869 redirty_page_for_writepage(wbc, page);
870 return AOP_WRITEPAGE_ACTIVATE;
871}
872
873static int __f2fs_writepage(struct page *page, struct writeback_control *wbc,
874 void *data)
875{
876 struct address_space *mapping = data;
877 int ret = mapping->a_ops->writepage(page, wbc);
878 mapping_set_error(mapping, ret);
879 return ret;
880}
881
882static int f2fs_write_data_pages(struct address_space *mapping,
883 struct writeback_control *wbc)
884{
885 struct inode *inode = mapping->host;
886 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
887 bool locked = false;
888 int ret;
889 long diff;
890
891 trace_f2fs_writepages(mapping->host, wbc, DATA);
892
893 /* deal with chardevs and other special file */
894 if (!mapping->a_ops->writepage)
895 return 0;
896
897 if (S_ISDIR(inode->i_mode) && wbc->sync_mode == WB_SYNC_NONE &&
898 get_dirty_dents(inode) < nr_pages_to_skip(sbi, DATA) &&
899 available_free_memory(sbi, DIRTY_DENTS))
900 goto skip_write;
901
902 diff = nr_pages_to_write(sbi, DATA, wbc);
903
904 if (!S_ISDIR(inode->i_mode)) {
905 mutex_lock(&sbi->writepages);
906 locked = true;
907 }
908 ret = write_cache_pages(mapping, wbc, __f2fs_writepage, mapping);
909 if (locked)
910 mutex_unlock(&sbi->writepages);
911
912 f2fs_submit_merged_bio(sbi, DATA, WRITE);
913
914 remove_dirty_dir_inode(inode);
915
916 wbc->nr_to_write = max((long)0, wbc->nr_to_write - diff);
917 return ret;
918
919skip_write:
920 wbc->pages_skipped += get_dirty_dents(inode);
921 return 0;
922}
923
924static void f2fs_write_failed(struct address_space *mapping, loff_t to)
925{
926 struct inode *inode = mapping->host;
927
928 if (to > inode->i_size) {
929 truncate_pagecache(inode, inode->i_size);
930 truncate_blocks(inode, inode->i_size);
931 }
932}
933
934static int f2fs_write_begin(struct file *file, struct address_space *mapping,
935 loff_t pos, unsigned len, unsigned flags,
936 struct page **pagep, void **fsdata)
937{
938 struct inode *inode = mapping->host;
939 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
940 struct page *page;
941 pgoff_t index = ((unsigned long long) pos) >> PAGE_CACHE_SHIFT;
942 struct dnode_of_data dn;
943 int err = 0;
944
945 trace_f2fs_write_begin(inode, pos, len, flags);
946
947 f2fs_balance_fs(sbi);
948repeat:
949 err = f2fs_convert_inline_data(inode, pos + len, NULL);
950 if (err)
951 goto fail;
952
953 page = grab_cache_page_write_begin(mapping, index, flags);
954 if (!page) {
955 err = -ENOMEM;
956 goto fail;
957 }
958
959 /* to avoid latency during memory pressure */
960 unlock_page(page);
961
962 *pagep = page;
963
964 if (f2fs_has_inline_data(inode) && (pos + len) <= MAX_INLINE_DATA)
965 goto inline_data;
966
967 f2fs_lock_op(sbi);
968 set_new_dnode(&dn, inode, NULL, NULL, 0);
969 err = f2fs_reserve_block(&dn, index);
970 f2fs_unlock_op(sbi);
971 if (err) {
972 f2fs_put_page(page, 0);
973 goto fail;
974 }
975inline_data:
976 lock_page(page);
977 if (unlikely(page->mapping != mapping)) {
978 f2fs_put_page(page, 1);
979 goto repeat;
980 }
981
982 f2fs_wait_on_page_writeback(page, DATA);
983
984 if ((len == PAGE_CACHE_SIZE) || PageUptodate(page))
985 return 0;
986
987 if ((pos & PAGE_CACHE_MASK) >= i_size_read(inode)) {
988 unsigned start = pos & (PAGE_CACHE_SIZE - 1);
989 unsigned end = start + len;
990
991 /* Reading beyond i_size is simple: memset to zero */
992 zero_user_segments(page, 0, start, end, PAGE_CACHE_SIZE);
993 goto out;
994 }
995
996 if (dn.data_blkaddr == NEW_ADDR) {
997 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
998 } else {
999 if (f2fs_has_inline_data(inode)) {
1000 err = f2fs_read_inline_data(inode, page);
1001 if (err) {
1002 page_cache_release(page);
1003 goto fail;
1004 }
1005 } else {
1006 err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr,
1007 READ_SYNC);
1008 if (err)
1009 goto fail;
1010 }
1011
1012 lock_page(page);
1013 if (unlikely(!PageUptodate(page))) {
1014 f2fs_put_page(page, 1);
1015 err = -EIO;
1016 goto fail;
1017 }
1018 if (unlikely(page->mapping != mapping)) {
1019 f2fs_put_page(page, 1);
1020 goto repeat;
1021 }
1022 }
1023out:
1024 SetPageUptodate(page);
1025 clear_cold_data(page);
1026 return 0;
1027fail:
1028 f2fs_write_failed(mapping, pos + len);
1029 return err;
1030}
1031
1032static int f2fs_write_end(struct file *file,
1033 struct address_space *mapping,
1034 loff_t pos, unsigned len, unsigned copied,
1035 struct page *page, void *fsdata)
1036{
1037 struct inode *inode = page->mapping->host;
1038
1039 trace_f2fs_write_end(inode, pos, len, copied);
1040
1041 set_page_dirty(page);
1042
1043 if (pos + copied > i_size_read(inode)) {
1044 i_size_write(inode, pos + copied);
1045 mark_inode_dirty(inode);
1046 update_inode_page(inode);
1047 }
1048
1049 f2fs_put_page(page, 1);
1050 return copied;
1051}
1052
1053static int check_direct_IO(struct inode *inode, int rw,
1054 struct iov_iter *iter, loff_t offset)
1055{
1056 unsigned blocksize_mask = inode->i_sb->s_blocksize - 1;
1057
1058 if (rw == READ)
1059 return 0;
1060
1061 if (offset & blocksize_mask)
1062 return -EINVAL;
1063
1064 if (iov_iter_alignment(iter) & blocksize_mask)
1065 return -EINVAL;
1066
1067 return 0;
1068}
1069
1070static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb,
1071 struct iov_iter *iter, loff_t offset)
1072{
1073 struct file *file = iocb->ki_filp;
1074 struct address_space *mapping = file->f_mapping;
1075 struct inode *inode = mapping->host;
1076 size_t count = iov_iter_count(iter);
1077 int err;
1078
1079 /* Let buffer I/O handle the inline data case. */
1080 if (f2fs_has_inline_data(inode))
1081 return 0;
1082
1083 if (check_direct_IO(inode, rw, iter, offset))
1084 return 0;
1085
1086 /* clear fsync mark to recover these blocks */
1087 fsync_mark_clear(F2FS_SB(inode->i_sb), inode->i_ino);
1088
1089 trace_f2fs_direct_IO_enter(inode, offset, count, rw);
1090
1091 err = blockdev_direct_IO(rw, iocb, inode, iter, offset, get_data_block);
1092 if (err < 0 && (rw & WRITE))
1093 f2fs_write_failed(mapping, offset + count);
1094
1095 trace_f2fs_direct_IO_exit(inode, offset, count, rw, err);
1096
1097 return err;
1098}
1099
1100static void f2fs_invalidate_data_page(struct page *page, unsigned int offset,
1101 unsigned int length)
1102{
1103 struct inode *inode = page->mapping->host;
1104 if (PageDirty(page))
1105 inode_dec_dirty_dents(inode);
1106 ClearPagePrivate(page);
1107}
1108
1109static int f2fs_release_data_page(struct page *page, gfp_t wait)
1110{
1111 ClearPagePrivate(page);
1112 return 1;
1113}
1114
1115static int f2fs_set_data_page_dirty(struct page *page)
1116{
1117 struct address_space *mapping = page->mapping;
1118 struct inode *inode = mapping->host;
1119
1120 trace_f2fs_set_page_dirty(page, DATA);
1121
1122 SetPageUptodate(page);
1123 mark_inode_dirty(inode);
1124
1125 if (!PageDirty(page)) {
1126 __set_page_dirty_nobuffers(page);
1127 set_dirty_dir_page(inode, page);
1128 return 1;
1129 }
1130 return 0;
1131}
1132
1133static sector_t f2fs_bmap(struct address_space *mapping, sector_t block)
1134{
1135 struct inode *inode = mapping->host;
1136
1137 if (f2fs_has_inline_data(inode))
1138 return 0;
1139
1140 return generic_block_bmap(mapping, block, get_data_block);
1141}
1142
1143const struct address_space_operations f2fs_dblock_aops = {
1144 .readpage = f2fs_read_data_page,
1145 .readpages = f2fs_read_data_pages,
1146 .writepage = f2fs_write_data_page,
1147 .writepages = f2fs_write_data_pages,
1148 .write_begin = f2fs_write_begin,
1149 .write_end = f2fs_write_end,
1150 .set_page_dirty = f2fs_set_data_page_dirty,
1151 .invalidatepage = f2fs_invalidate_data_page,
1152 .releasepage = f2fs_release_data_page,
1153 .direct_IO = f2fs_direct_IO,
1154 .bmap = f2fs_bmap,
1155};