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Linux 3.16-rc2
[linux/fpc-iii.git] / fs / f2fs / data.c
blob0924521306b40c5087f2c2170c92fe7b03452862
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
27 static 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
46 static 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 */
79 static 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
95 static 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
129 void 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 io->fio.rw = WRITE_FLUSH_FUA | REQ_META | REQ_PRIO;
143 }
144 __submit_merged_bio(io);
145 up_write(&io->io_rwsem);
146 }
147
148 /*
149 * Fill the locked page with data located in the block address.
150 * Return unlocked page.
151 */
152 int f2fs_submit_page_bio(struct f2fs_sb_info *sbi, struct page *page,
153 block_t blk_addr, int rw)
154 {
155 struct bio *bio;
156
157 trace_f2fs_submit_page_bio(page, blk_addr, rw);
158
159 /* Allocate a new bio */
160 bio = __bio_alloc(sbi, blk_addr, 1, is_read_io(rw));
161
162 if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) {
163 bio_put(bio);
164 f2fs_put_page(page, 1);
165 return -EFAULT;
166 }
167
168 submit_bio(rw, bio);
169 return 0;
170 }
171
172 void f2fs_submit_page_mbio(struct f2fs_sb_info *sbi, struct page *page,
173 block_t blk_addr, struct f2fs_io_info *fio)
174 {
175 enum page_type btype = PAGE_TYPE_OF_BIO(fio->type);
176 struct f2fs_bio_info *io;
177 bool is_read = is_read_io(fio->rw);
178
179 io = is_read ? &sbi->read_io : &sbi->write_io[btype];
180
181 verify_block_addr(sbi, blk_addr);
182
183 down_write(&io->io_rwsem);
184
185 if (!is_read)
186 inc_page_count(sbi, F2FS_WRITEBACK);
187
188 if (io->bio && (io->last_block_in_bio != blk_addr - 1 ||
189 io->fio.rw != fio->rw))
190 __submit_merged_bio(io);
191 alloc_new:
192 if (io->bio == NULL) {
193 int bio_blocks = MAX_BIO_BLOCKS(max_hw_blocks(sbi));
194
195 io->bio = __bio_alloc(sbi, blk_addr, bio_blocks, is_read);
196 io->fio = *fio;
197 }
198
199 if (bio_add_page(io->bio, page, PAGE_CACHE_SIZE, 0) <
200 PAGE_CACHE_SIZE) {
201 __submit_merged_bio(io);
202 goto alloc_new;
203 }
204
205 io->last_block_in_bio = blk_addr;
206
207 up_write(&io->io_rwsem);
208 trace_f2fs_submit_page_mbio(page, fio->rw, fio->type, blk_addr);
209 }
210
211 /*
212 * Lock ordering for the change of data block address:
213 * ->data_page
214 * ->node_page
215 * update block addresses in the node page
216 */
217 static void __set_data_blkaddr(struct dnode_of_data *dn, block_t new_addr)
218 {
219 struct f2fs_node *rn;
220 __le32 *addr_array;
221 struct page *node_page = dn->node_page;
222 unsigned int ofs_in_node = dn->ofs_in_node;
223
224 f2fs_wait_on_page_writeback(node_page, NODE);
225
226 rn = F2FS_NODE(node_page);
227
228 /* Get physical address of data block */
229 addr_array = blkaddr_in_node(rn);
230 addr_array[ofs_in_node] = cpu_to_le32(new_addr);
231 set_page_dirty(node_page);
232 }
233
234 int reserve_new_block(struct dnode_of_data *dn)
235 {
236 struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
237
238 if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)))
239 return -EPERM;
240 if (unlikely(!inc_valid_block_count(sbi, dn->inode, 1)))
241 return -ENOSPC;
242
243 trace_f2fs_reserve_new_block(dn->inode, dn->nid, dn->ofs_in_node);
244
245 __set_data_blkaddr(dn, NEW_ADDR);
246 dn->data_blkaddr = NEW_ADDR;
247 mark_inode_dirty(dn->inode);
248 sync_inode_page(dn);
249 return 0;
250 }
251
252 int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index)
253 {
254 bool need_put = dn->inode_page ? false : true;
255 int err;
256
257 /* if inode_page exists, index should be zero */
258 f2fs_bug_on(!need_put && index);
259
260 err = get_dnode_of_data(dn, index, ALLOC_NODE);
261 if (err)
262 return err;
263
264 if (dn->data_blkaddr == NULL_ADDR)
265 err = reserve_new_block(dn);
266 if (err || need_put)
267 f2fs_put_dnode(dn);
268 return err;
269 }
270
271 static int check_extent_cache(struct inode *inode, pgoff_t pgofs,
272 struct buffer_head *bh_result)
273 {
274 struct f2fs_inode_info *fi = F2FS_I(inode);
275 pgoff_t start_fofs, end_fofs;
276 block_t start_blkaddr;
277
278 if (is_inode_flag_set(fi, FI_NO_EXTENT))
279 return 0;
280
281 read_lock(&fi->ext.ext_lock);
282 if (fi->ext.len == 0) {
283 read_unlock(&fi->ext.ext_lock);
284 return 0;
285 }
286
287 stat_inc_total_hit(inode->i_sb);
288
289 start_fofs = fi->ext.fofs;
290 end_fofs = fi->ext.fofs + fi->ext.len - 1;
291 start_blkaddr = fi->ext.blk_addr;
292
293 if (pgofs >= start_fofs && pgofs <= end_fofs) {
294 unsigned int blkbits = inode->i_sb->s_blocksize_bits;
295 size_t count;
296
297 clear_buffer_new(bh_result);
298 map_bh(bh_result, inode->i_sb,
299 start_blkaddr + pgofs - start_fofs);
300 count = end_fofs - pgofs + 1;
301 if (count < (UINT_MAX >> blkbits))
302 bh_result->b_size = (count << blkbits);
303 else
304 bh_result->b_size = UINT_MAX;
305
306 stat_inc_read_hit(inode->i_sb);
307 read_unlock(&fi->ext.ext_lock);
308 return 1;
309 }
310 read_unlock(&fi->ext.ext_lock);
311 return 0;
312 }
313
314 void update_extent_cache(block_t blk_addr, struct dnode_of_data *dn)
315 {
316 struct f2fs_inode_info *fi = F2FS_I(dn->inode);
317 pgoff_t fofs, start_fofs, end_fofs;
318 block_t start_blkaddr, end_blkaddr;
319 int need_update = true;
320
321 f2fs_bug_on(blk_addr == NEW_ADDR);
322 fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) +
323 dn->ofs_in_node;
324
325 /* Update the page address in the parent node */
326 __set_data_blkaddr(dn, blk_addr);
327
328 if (is_inode_flag_set(fi, FI_NO_EXTENT))
329 return;
330
331 write_lock(&fi->ext.ext_lock);
332
333 start_fofs = fi->ext.fofs;
334 end_fofs = fi->ext.fofs + fi->ext.len - 1;
335 start_blkaddr = fi->ext.blk_addr;
336 end_blkaddr = fi->ext.blk_addr + fi->ext.len - 1;
337
338 /* Drop and initialize the matched extent */
339 if (fi->ext.len == 1 && fofs == start_fofs)
340 fi->ext.len = 0;
341
342 /* Initial extent */
343 if (fi->ext.len == 0) {
344 if (blk_addr != NULL_ADDR) {
345 fi->ext.fofs = fofs;
346 fi->ext.blk_addr = blk_addr;
347 fi->ext.len = 1;
348 }
349 goto end_update;
350 }
351
352 /* Front merge */
353 if (fofs == start_fofs - 1 && blk_addr == start_blkaddr - 1) {
354 fi->ext.fofs--;
355 fi->ext.blk_addr--;
356 fi->ext.len++;
357 goto end_update;
358 }
359
360 /* Back merge */
361 if (fofs == end_fofs + 1 && blk_addr == end_blkaddr + 1) {
362 fi->ext.len++;
363 goto end_update;
364 }
365
366 /* Split the existing extent */
367 if (fi->ext.len > 1 &&
368 fofs >= start_fofs && fofs <= end_fofs) {
369 if ((end_fofs - fofs) < (fi->ext.len >> 1)) {
370 fi->ext.len = fofs - start_fofs;
371 } else {
372 fi->ext.fofs = fofs + 1;
373 fi->ext.blk_addr = start_blkaddr +
374 fofs - start_fofs + 1;
375 fi->ext.len -= fofs - start_fofs + 1;
376 }
377 } else {
378 need_update = false;
379 }
380
381 /* Finally, if the extent is very fragmented, let's drop the cache. */
382 if (fi->ext.len < F2FS_MIN_EXTENT_LEN) {
383 fi->ext.len = 0;
384 set_inode_flag(fi, FI_NO_EXTENT);
385 need_update = true;
386 }
387 end_update:
388 write_unlock(&fi->ext.ext_lock);
389 if (need_update)
390 sync_inode_page(dn);
391 return;
392 }
393
394 struct page *find_data_page(struct inode *inode, pgoff_t index, bool sync)
395 {
396 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
397 struct address_space *mapping = inode->i_mapping;
398 struct dnode_of_data dn;
399 struct page *page;
400 int err;
401
402 page = find_get_page(mapping, index);
403 if (page && PageUptodate(page))
404 return page;
405 f2fs_put_page(page, 0);
406
407 set_new_dnode(&dn, inode, NULL, NULL, 0);
408 err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
409 if (err)
410 return ERR_PTR(err);
411 f2fs_put_dnode(&dn);
412
413 if (dn.data_blkaddr == NULL_ADDR)
414 return ERR_PTR(-ENOENT);
415
416 /* By fallocate(), there is no cached page, but with NEW_ADDR */
417 if (unlikely(dn.data_blkaddr == NEW_ADDR))
418 return ERR_PTR(-EINVAL);
419
420 page = grab_cache_page(mapping, index);
421 if (!page)
422 return ERR_PTR(-ENOMEM);
423
424 if (PageUptodate(page)) {
425 unlock_page(page);
426 return page;
427 }
428
429 err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr,
430 sync ? READ_SYNC : READA);
431 if (err)
432 return ERR_PTR(err);
433
434 if (sync) {
435 wait_on_page_locked(page);
436 if (unlikely(!PageUptodate(page))) {
437 f2fs_put_page(page, 0);
438 return ERR_PTR(-EIO);
439 }
440 }
441 return page;
442 }
443
444 /*
445 * If it tries to access a hole, return an error.
446 * Because, the callers, functions in dir.c and GC, should be able to know
447 * whether this page exists or not.
448 */
449 struct page *get_lock_data_page(struct inode *inode, pgoff_t index)
450 {
451 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
452 struct address_space *mapping = inode->i_mapping;
453 struct dnode_of_data dn;
454 struct page *page;
455 int err;
456
457 repeat:
458 page = grab_cache_page(mapping, index);
459 if (!page)
460 return ERR_PTR(-ENOMEM);
461
462 set_new_dnode(&dn, inode, NULL, NULL, 0);
463 err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
464 if (err) {
465 f2fs_put_page(page, 1);
466 return ERR_PTR(err);
467 }
468 f2fs_put_dnode(&dn);
469
470 if (unlikely(dn.data_blkaddr == NULL_ADDR)) {
471 f2fs_put_page(page, 1);
472 return ERR_PTR(-ENOENT);
473 }
474
475 if (PageUptodate(page))
476 return page;
477
478 /*
479 * A new dentry page is allocated but not able to be written, since its
480 * new inode page couldn't be allocated due to -ENOSPC.
481 * In such the case, its blkaddr can be remained as NEW_ADDR.
482 * see, f2fs_add_link -> get_new_data_page -> init_inode_metadata.
483 */
484 if (dn.data_blkaddr == NEW_ADDR) {
485 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
486 SetPageUptodate(page);
487 return page;
488 }
489
490 err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr, READ_SYNC);
491 if (err)
492 return ERR_PTR(err);
493
494 lock_page(page);
495 if (unlikely(!PageUptodate(page))) {
496 f2fs_put_page(page, 1);
497 return ERR_PTR(-EIO);
498 }
499 if (unlikely(page->mapping != mapping)) {
500 f2fs_put_page(page, 1);
501 goto repeat;
502 }
503 return page;
504 }
505
506 /*
507 * Caller ensures that this data page is never allocated.
508 * A new zero-filled data page is allocated in the page cache.
509 *
510 * Also, caller should grab and release a rwsem by calling f2fs_lock_op() and
511 * f2fs_unlock_op().
512 * Note that, ipage is set only by make_empty_dir.
513 */
514 struct page *get_new_data_page(struct inode *inode,
515 struct page *ipage, pgoff_t index, bool new_i_size)
516 {
517 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
518 struct address_space *mapping = inode->i_mapping;
519 struct page *page;
520 struct dnode_of_data dn;
521 int err;
522
523 set_new_dnode(&dn, inode, ipage, NULL, 0);
524 err = f2fs_reserve_block(&dn, index);
525 if (err)
526 return ERR_PTR(err);
527 repeat:
528 page = grab_cache_page(mapping, index);
529 if (!page) {
530 err = -ENOMEM;
531 goto put_err;
532 }
533
534 if (PageUptodate(page))
535 return page;
536
537 if (dn.data_blkaddr == NEW_ADDR) {
538 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
539 SetPageUptodate(page);
540 } else {
541 err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr,
542 READ_SYNC);
543 if (err)
544 goto put_err;
545
546 lock_page(page);
547 if (unlikely(!PageUptodate(page))) {
548 f2fs_put_page(page, 1);
549 err = -EIO;
550 goto put_err;
551 }
552 if (unlikely(page->mapping != mapping)) {
553 f2fs_put_page(page, 1);
554 goto repeat;
555 }
556 }
557
558 if (new_i_size &&
559 i_size_read(inode) < ((index + 1) << PAGE_CACHE_SHIFT)) {
560 i_size_write(inode, ((index + 1) << PAGE_CACHE_SHIFT));
561 /* Only the directory inode sets new_i_size */
562 set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR);
563 }
564 return page;
565
566 put_err:
567 f2fs_put_dnode(&dn);
568 return ERR_PTR(err);
569 }
570
571 static int __allocate_data_block(struct dnode_of_data *dn)
572 {
573 struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
574 struct f2fs_summary sum;
575 block_t new_blkaddr;
576 struct node_info ni;
577 int type;
578
579 if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)))
580 return -EPERM;
581 if (unlikely(!inc_valid_block_count(sbi, dn->inode, 1)))
582 return -ENOSPC;
583
584 __set_data_blkaddr(dn, NEW_ADDR);
585 dn->data_blkaddr = NEW_ADDR;
586
587 get_node_info(sbi, dn->nid, &ni);
588 set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version);
589
590 type = CURSEG_WARM_DATA;
591
592 allocate_data_block(sbi, NULL, NULL_ADDR, &new_blkaddr, &sum, type);
593
594 /* direct IO doesn't use extent cache to maximize the performance */
595 set_inode_flag(F2FS_I(dn->inode), FI_NO_EXTENT);
596 update_extent_cache(new_blkaddr, dn);
597 clear_inode_flag(F2FS_I(dn->inode), FI_NO_EXTENT);
598
599 dn->data_blkaddr = new_blkaddr;
600 return 0;
601 }
602
603 /*
604 * get_data_block() now supported readahead/bmap/rw direct_IO with mapped bh.
605 * If original data blocks are allocated, then give them to blockdev.
606 * Otherwise,
607 * a. preallocate requested block addresses
608 * b. do not use extent cache for better performance
609 * c. give the block addresses to blockdev
610 */
611 static int get_data_block(struct inode *inode, sector_t iblock,
612 struct buffer_head *bh_result, int create)
613 {
614 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
615 unsigned int blkbits = inode->i_sb->s_blocksize_bits;
616 unsigned maxblocks = bh_result->b_size >> blkbits;
617 struct dnode_of_data dn;
618 int mode = create ? ALLOC_NODE : LOOKUP_NODE_RA;
619 pgoff_t pgofs, end_offset;
620 int err = 0, ofs = 1;
621 bool allocated = false;
622
623 /* Get the page offset from the block offset(iblock) */
624 pgofs = (pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits));
625
626 if (check_extent_cache(inode, pgofs, bh_result))
627 goto out;
628
629 if (create)
630 f2fs_lock_op(sbi);
631
632 /* When reading holes, we need its node page */
633 set_new_dnode(&dn, inode, NULL, NULL, 0);
634 err = get_dnode_of_data(&dn, pgofs, mode);
635 if (err) {
636 if (err == -ENOENT)
637 err = 0;
638 goto unlock_out;
639 }
640 if (dn.data_blkaddr == NEW_ADDR)
641 goto put_out;
642
643 if (dn.data_blkaddr != NULL_ADDR) {
644 map_bh(bh_result, inode->i_sb, dn.data_blkaddr);
645 } else if (create) {
646 err = __allocate_data_block(&dn);
647 if (err)
648 goto put_out;
649 allocated = true;
650 map_bh(bh_result, inode->i_sb, dn.data_blkaddr);
651 } else {
652 goto put_out;
653 }
654
655 end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
656 bh_result->b_size = (((size_t)1) << blkbits);
657 dn.ofs_in_node++;
658 pgofs++;
659
660 get_next:
661 if (dn.ofs_in_node >= end_offset) {
662 if (allocated)
663 sync_inode_page(&dn);
664 allocated = false;
665 f2fs_put_dnode(&dn);
666
667 set_new_dnode(&dn, inode, NULL, NULL, 0);
668 err = get_dnode_of_data(&dn, pgofs, mode);
669 if (err) {
670 if (err == -ENOENT)
671 err = 0;
672 goto unlock_out;
673 }
674 if (dn.data_blkaddr == NEW_ADDR)
675 goto put_out;
676
677 end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
678 }
679
680 if (maxblocks > (bh_result->b_size >> blkbits)) {
681 block_t blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node);
682 if (blkaddr == NULL_ADDR && create) {
683 err = __allocate_data_block(&dn);
684 if (err)
685 goto sync_out;
686 allocated = true;
687 blkaddr = dn.data_blkaddr;
688 }
689 /* Give more consecutive addresses for the read ahead */
690 if (blkaddr == (bh_result->b_blocknr + ofs)) {
691 ofs++;
692 dn.ofs_in_node++;
693 pgofs++;
694 bh_result->b_size += (((size_t)1) << blkbits);
695 goto get_next;
696 }
697 }
698 sync_out:
699 if (allocated)
700 sync_inode_page(&dn);
701 put_out:
702 f2fs_put_dnode(&dn);
703 unlock_out:
704 if (create)
705 f2fs_unlock_op(sbi);
706 out:
707 trace_f2fs_get_data_block(inode, iblock, bh_result, err);
708 return err;
709 }
710
711 int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
712 u64 start, u64 len)
713 {
714 return generic_block_fiemap(inode, fieinfo, start, len, get_data_block);
715 }
716
717 static int f2fs_read_data_page(struct file *file, struct page *page)
718 {
719 struct inode *inode = page->mapping->host;
720 int ret;
721
722 trace_f2fs_readpage(page, DATA);
723
724 /* If the file has inline data, try to read it directlly */
725 if (f2fs_has_inline_data(inode))
726 ret = f2fs_read_inline_data(inode, page);
727 else
728 ret = mpage_readpage(page, get_data_block);
729
730 return ret;
731 }
732
733 static int f2fs_read_data_pages(struct file *file,
734 struct address_space *mapping,
735 struct list_head *pages, unsigned nr_pages)
736 {
737 struct inode *inode = file->f_mapping->host;
738
739 /* If the file has inline data, skip readpages */
740 if (f2fs_has_inline_data(inode))
741 return 0;
742
743 return mpage_readpages(mapping, pages, nr_pages, get_data_block);
744 }
745
746 int do_write_data_page(struct page *page, struct f2fs_io_info *fio)
747 {
748 struct inode *inode = page->mapping->host;
749 block_t old_blkaddr, new_blkaddr;
750 struct dnode_of_data dn;
751 int err = 0;
752
753 set_new_dnode(&dn, inode, NULL, NULL, 0);
754 err = get_dnode_of_data(&dn, page->index, LOOKUP_NODE);
755 if (err)
756 return err;
757
758 old_blkaddr = dn.data_blkaddr;
759
760 /* This page is already truncated */
761 if (old_blkaddr == NULL_ADDR)
762 goto out_writepage;
763
764 set_page_writeback(page);
765
766 /*
767 * If current allocation needs SSR,
768 * it had better in-place writes for updated data.
769 */
770 if (unlikely(old_blkaddr != NEW_ADDR &&
771 !is_cold_data(page) &&
772 need_inplace_update(inode))) {
773 rewrite_data_page(page, old_blkaddr, fio);
774 } else {
775 write_data_page(page, &dn, &new_blkaddr, fio);
776 update_extent_cache(new_blkaddr, &dn);
777 }
778 out_writepage:
779 f2fs_put_dnode(&dn);
780 return err;
781 }
782
783 static int f2fs_write_data_page(struct page *page,
784 struct writeback_control *wbc)
785 {
786 struct inode *inode = page->mapping->host;
787 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
788 loff_t i_size = i_size_read(inode);
789 const pgoff_t end_index = ((unsigned long long) i_size)
790 >> PAGE_CACHE_SHIFT;
791 unsigned offset = 0;
792 bool need_balance_fs = false;
793 int err = 0;
794 struct f2fs_io_info fio = {
795 .type = DATA,
796 .rw = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : WRITE,
797 };
798
799 trace_f2fs_writepage(page, DATA);
800
801 if (page->index < end_index)
802 goto write;
803
804 /*
805 * If the offset is out-of-range of file size,
806 * this page does not have to be written to disk.
807 */
808 offset = i_size & (PAGE_CACHE_SIZE - 1);
809 if ((page->index >= end_index + 1) || !offset)
810 goto out;
811
812 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
813 write:
814 if (unlikely(sbi->por_doing))
815 goto redirty_out;
816
817 /* Dentry blocks are controlled by checkpoint */
818 if (S_ISDIR(inode->i_mode)) {
819 err = do_write_data_page(page, &fio);
820 goto done;
821 }
822
823 if (!wbc->for_reclaim)
824 need_balance_fs = true;
825 else if (has_not_enough_free_secs(sbi, 0))
826 goto redirty_out;
827
828 f2fs_lock_op(sbi);
829 if (f2fs_has_inline_data(inode) || f2fs_may_inline(inode))
830 err = f2fs_write_inline_data(inode, page, offset);
831 else
832 err = do_write_data_page(page, &fio);
833 f2fs_unlock_op(sbi);
834 done:
835 if (err && err != -ENOENT)
836 goto redirty_out;
837
838 clear_cold_data(page);
839 out:
840 inode_dec_dirty_dents(inode);
841 unlock_page(page);
842 if (need_balance_fs)
843 f2fs_balance_fs(sbi);
844 if (wbc->for_reclaim)
845 f2fs_submit_merged_bio(sbi, DATA, WRITE);
846 return 0;
847
848 redirty_out:
849 redirty_page_for_writepage(wbc, page);
850 return AOP_WRITEPAGE_ACTIVATE;
851 }
852
853 static int __f2fs_writepage(struct page *page, struct writeback_control *wbc,
854 void *data)
855 {
856 struct address_space *mapping = data;
857 int ret = mapping->a_ops->writepage(page, wbc);
858 mapping_set_error(mapping, ret);
859 return ret;
860 }
861
862 static int f2fs_write_data_pages(struct address_space *mapping,
863 struct writeback_control *wbc)
864 {
865 struct inode *inode = mapping->host;
866 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
867 bool locked = false;
868 int ret;
869 long diff;
870
871 trace_f2fs_writepages(mapping->host, wbc, DATA);
872
873 /* deal with chardevs and other special file */
874 if (!mapping->a_ops->writepage)
875 return 0;
876
877 if (S_ISDIR(inode->i_mode) && wbc->sync_mode == WB_SYNC_NONE &&
878 get_dirty_dents(inode) < nr_pages_to_skip(sbi, DATA) &&
879 available_free_memory(sbi, DIRTY_DENTS))
880 goto skip_write;
881
882 diff = nr_pages_to_write(sbi, DATA, wbc);
883
884 if (!S_ISDIR(inode->i_mode)) {
885 mutex_lock(&sbi->writepages);
886 locked = true;
887 }
888 ret = write_cache_pages(mapping, wbc, __f2fs_writepage, mapping);
889 if (locked)
890 mutex_unlock(&sbi->writepages);
891
892 f2fs_submit_merged_bio(sbi, DATA, WRITE);
893
894 remove_dirty_dir_inode(inode);
895
896 wbc->nr_to_write = max((long)0, wbc->nr_to_write - diff);
897 return ret;
898
899 skip_write:
900 wbc->pages_skipped += get_dirty_dents(inode);
901 return 0;
902 }
903
904 static int f2fs_write_begin(struct file *file, struct address_space *mapping,
905 loff_t pos, unsigned len, unsigned flags,
906 struct page **pagep, void **fsdata)
907 {
908 struct inode *inode = mapping->host;
909 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
910 struct page *page;
911 pgoff_t index = ((unsigned long long) pos) >> PAGE_CACHE_SHIFT;
912 struct dnode_of_data dn;
913 int err = 0;
914
915 trace_f2fs_write_begin(inode, pos, len, flags);
916
917 f2fs_balance_fs(sbi);
918 repeat:
919 err = f2fs_convert_inline_data(inode, pos + len);
920 if (err)
921 return err;
922
923 page = grab_cache_page_write_begin(mapping, index, flags);
924 if (!page)
925 return -ENOMEM;
926
927 /* to avoid latency during memory pressure */
928 unlock_page(page);
929
930 *pagep = page;
931
932 if (f2fs_has_inline_data(inode) && (pos + len) <= MAX_INLINE_DATA)
933 goto inline_data;
934
935 f2fs_lock_op(sbi);
936 set_new_dnode(&dn, inode, NULL, NULL, 0);
937 err = f2fs_reserve_block(&dn, index);
938 f2fs_unlock_op(sbi);
939
940 if (err) {
941 f2fs_put_page(page, 0);
942 return err;
943 }
944 inline_data:
945 lock_page(page);
946 if (unlikely(page->mapping != mapping)) {
947 f2fs_put_page(page, 1);
948 goto repeat;
949 }
950
951 f2fs_wait_on_page_writeback(page, DATA);
952
953 if ((len == PAGE_CACHE_SIZE) || PageUptodate(page))
954 return 0;
955
956 if ((pos & PAGE_CACHE_MASK) >= i_size_read(inode)) {
957 unsigned start = pos & (PAGE_CACHE_SIZE - 1);
958 unsigned end = start + len;
959
960 /* Reading beyond i_size is simple: memset to zero */
961 zero_user_segments(page, 0, start, end, PAGE_CACHE_SIZE);
962 goto out;
963 }
964
965 if (dn.data_blkaddr == NEW_ADDR) {
966 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
967 } else {
968 if (f2fs_has_inline_data(inode)) {
969 err = f2fs_read_inline_data(inode, page);
970 if (err) {
971 page_cache_release(page);
972 return err;
973 }
974 } else {
975 err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr,
976 READ_SYNC);
977 if (err)
978 return err;
979 }
980
981 lock_page(page);
982 if (unlikely(!PageUptodate(page))) {
983 f2fs_put_page(page, 1);
984 return -EIO;
985 }
986 if (unlikely(page->mapping != mapping)) {
987 f2fs_put_page(page, 1);
988 goto repeat;
989 }
990 }
991 out:
992 SetPageUptodate(page);
993 clear_cold_data(page);
994 return 0;
995 }
996
997 static int f2fs_write_end(struct file *file,
998 struct address_space *mapping,
999 loff_t pos, unsigned len, unsigned copied,
1000 struct page *page, void *fsdata)
1001 {
1002 struct inode *inode = page->mapping->host;
1003
1004 trace_f2fs_write_end(inode, pos, len, copied);
1005
1006 SetPageUptodate(page);
1007 set_page_dirty(page);
1008
1009 if (pos + copied > i_size_read(inode)) {
1010 i_size_write(inode, pos + copied);
1011 mark_inode_dirty(inode);
1012 update_inode_page(inode);
1013 }
1014
1015 f2fs_put_page(page, 1);
1016 return copied;
1017 }
1018
1019 static int check_direct_IO(struct inode *inode, int rw,
1020 struct iov_iter *iter, loff_t offset)
1021 {
1022 unsigned blocksize_mask = inode->i_sb->s_blocksize - 1;
1023
1024 if (rw == READ)
1025 return 0;
1026
1027 if (offset & blocksize_mask)
1028 return -EINVAL;
1029
1030 if (iov_iter_alignment(iter) & blocksize_mask)
1031 return -EINVAL;
1032
1033 return 0;
1034 }
1035
1036 static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb,
1037 struct iov_iter *iter, loff_t offset)
1038 {
1039 struct file *file = iocb->ki_filp;
1040 struct inode *inode = file->f_mapping->host;
1041
1042 /* Let buffer I/O handle the inline data case. */
1043 if (f2fs_has_inline_data(inode))
1044 return 0;
1045
1046 if (check_direct_IO(inode, rw, iter, offset))
1047 return 0;
1048
1049 /* clear fsync mark to recover these blocks */
1050 fsync_mark_clear(F2FS_SB(inode->i_sb), inode->i_ino);
1051
1052 return blockdev_direct_IO(rw, iocb, inode, iter, offset,
1053 get_data_block);
1054 }
1055
1056 static void f2fs_invalidate_data_page(struct page *page, unsigned int offset,
1057 unsigned int length)
1058 {
1059 struct inode *inode = page->mapping->host;
1060 if (PageDirty(page))
1061 inode_dec_dirty_dents(inode);
1062 ClearPagePrivate(page);
1063 }
1064
1065 static int f2fs_release_data_page(struct page *page, gfp_t wait)
1066 {
1067 ClearPagePrivate(page);
1068 return 1;
1069 }
1070
1071 static int f2fs_set_data_page_dirty(struct page *page)
1072 {
1073 struct address_space *mapping = page->mapping;
1074 struct inode *inode = mapping->host;
1075
1076 trace_f2fs_set_page_dirty(page, DATA);
1077
1078 SetPageUptodate(page);
1079 mark_inode_dirty(inode);
1080
1081 if (!PageDirty(page)) {
1082 __set_page_dirty_nobuffers(page);
1083 set_dirty_dir_page(inode, page);
1084 return 1;
1085 }
1086 return 0;
1087 }
1088
1089 static sector_t f2fs_bmap(struct address_space *mapping, sector_t block)
1090 {
1091 struct inode *inode = mapping->host;
1092
1093 if (f2fs_has_inline_data(inode))
1094 return 0;
1095
1096 return generic_block_bmap(mapping, block, get_data_block);
1097 }
1098
1099 const struct address_space_operations f2fs_dblock_aops = {
1100 .readpage = f2fs_read_data_page,
1101 .readpages = f2fs_read_data_pages,
1102 .writepage = f2fs_write_data_page,
1103 .writepages = f2fs_write_data_pages,
1104 .write_begin = f2fs_write_begin,
1105 .write_end = f2fs_write_end,
1106 .set_page_dirty = f2fs_set_data_page_dirty,
1107 .invalidatepage = f2fs_invalidate_data_page,
1108 .releasepage = f2fs_release_data_page,
1109 .direct_IO = f2fs_direct_IO,
1110 .bmap = f2fs_bmap,
1111 };
Linux with added FPC-III support