Commit | Line | Data |
---|---|---|
0a8165d7 | 1 | /* |
eb47b800 JK |
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/writeback.h> | |
16 | #include <linux/backing-dev.h> | |
17 | #include <linux/blkdev.h> | |
18 | #include <linux/bio.h> | |
690e4a3e | 19 | #include <linux/prefetch.h> |
eb47b800 JK |
20 | |
21 | #include "f2fs.h" | |
22 | #include "node.h" | |
23 | #include "segment.h" | |
24 | ||
0a8165d7 | 25 | /* |
eb47b800 JK |
26 | * Lock ordering for the change of data block address: |
27 | * ->data_page | |
28 | * ->node_page | |
29 | * update block addresses in the node page | |
30 | */ | |
31 | static void __set_data_blkaddr(struct dnode_of_data *dn, block_t new_addr) | |
32 | { | |
33 | struct f2fs_node *rn; | |
34 | __le32 *addr_array; | |
35 | struct page *node_page = dn->node_page; | |
36 | unsigned int ofs_in_node = dn->ofs_in_node; | |
37 | ||
38 | wait_on_page_writeback(node_page); | |
39 | ||
40 | rn = (struct f2fs_node *)page_address(node_page); | |
41 | ||
42 | /* Get physical address of data block */ | |
43 | addr_array = blkaddr_in_node(rn); | |
44 | addr_array[ofs_in_node] = cpu_to_le32(new_addr); | |
45 | set_page_dirty(node_page); | |
46 | } | |
47 | ||
48 | int reserve_new_block(struct dnode_of_data *dn) | |
49 | { | |
50 | struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb); | |
51 | ||
52 | if (is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)) | |
53 | return -EPERM; | |
54 | if (!inc_valid_block_count(sbi, dn->inode, 1)) | |
55 | return -ENOSPC; | |
56 | ||
57 | __set_data_blkaddr(dn, NEW_ADDR); | |
58 | dn->data_blkaddr = NEW_ADDR; | |
59 | sync_inode_page(dn); | |
60 | return 0; | |
61 | } | |
62 | ||
63 | static int check_extent_cache(struct inode *inode, pgoff_t pgofs, | |
64 | struct buffer_head *bh_result) | |
65 | { | |
66 | struct f2fs_inode_info *fi = F2FS_I(inode); | |
67 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
68 | pgoff_t start_fofs, end_fofs; | |
69 | block_t start_blkaddr; | |
70 | ||
71 | read_lock(&fi->ext.ext_lock); | |
72 | if (fi->ext.len == 0) { | |
73 | read_unlock(&fi->ext.ext_lock); | |
74 | return 0; | |
75 | } | |
76 | ||
77 | sbi->total_hit_ext++; | |
78 | start_fofs = fi->ext.fofs; | |
79 | end_fofs = fi->ext.fofs + fi->ext.len - 1; | |
80 | start_blkaddr = fi->ext.blk_addr; | |
81 | ||
82 | if (pgofs >= start_fofs && pgofs <= end_fofs) { | |
83 | unsigned int blkbits = inode->i_sb->s_blocksize_bits; | |
84 | size_t count; | |
85 | ||
86 | clear_buffer_new(bh_result); | |
87 | map_bh(bh_result, inode->i_sb, | |
88 | start_blkaddr + pgofs - start_fofs); | |
89 | count = end_fofs - pgofs + 1; | |
90 | if (count < (UINT_MAX >> blkbits)) | |
91 | bh_result->b_size = (count << blkbits); | |
92 | else | |
93 | bh_result->b_size = UINT_MAX; | |
94 | ||
95 | sbi->read_hit_ext++; | |
96 | read_unlock(&fi->ext.ext_lock); | |
97 | return 1; | |
98 | } | |
99 | read_unlock(&fi->ext.ext_lock); | |
100 | return 0; | |
101 | } | |
102 | ||
103 | void update_extent_cache(block_t blk_addr, struct dnode_of_data *dn) | |
104 | { | |
105 | struct f2fs_inode_info *fi = F2FS_I(dn->inode); | |
106 | pgoff_t fofs, start_fofs, end_fofs; | |
107 | block_t start_blkaddr, end_blkaddr; | |
108 | ||
109 | BUG_ON(blk_addr == NEW_ADDR); | |
110 | fofs = start_bidx_of_node(ofs_of_node(dn->node_page)) + dn->ofs_in_node; | |
111 | ||
112 | /* Update the page address in the parent node */ | |
113 | __set_data_blkaddr(dn, blk_addr); | |
114 | ||
115 | write_lock(&fi->ext.ext_lock); | |
116 | ||
117 | start_fofs = fi->ext.fofs; | |
118 | end_fofs = fi->ext.fofs + fi->ext.len - 1; | |
119 | start_blkaddr = fi->ext.blk_addr; | |
120 | end_blkaddr = fi->ext.blk_addr + fi->ext.len - 1; | |
121 | ||
122 | /* Drop and initialize the matched extent */ | |
123 | if (fi->ext.len == 1 && fofs == start_fofs) | |
124 | fi->ext.len = 0; | |
125 | ||
126 | /* Initial extent */ | |
127 | if (fi->ext.len == 0) { | |
128 | if (blk_addr != NULL_ADDR) { | |
129 | fi->ext.fofs = fofs; | |
130 | fi->ext.blk_addr = blk_addr; | |
131 | fi->ext.len = 1; | |
132 | } | |
133 | goto end_update; | |
134 | } | |
135 | ||
136 | /* Frone merge */ | |
137 | if (fofs == start_fofs - 1 && blk_addr == start_blkaddr - 1) { | |
138 | fi->ext.fofs--; | |
139 | fi->ext.blk_addr--; | |
140 | fi->ext.len++; | |
141 | goto end_update; | |
142 | } | |
143 | ||
144 | /* Back merge */ | |
145 | if (fofs == end_fofs + 1 && blk_addr == end_blkaddr + 1) { | |
146 | fi->ext.len++; | |
147 | goto end_update; | |
148 | } | |
149 | ||
150 | /* Split the existing extent */ | |
151 | if (fi->ext.len > 1 && | |
152 | fofs >= start_fofs && fofs <= end_fofs) { | |
153 | if ((end_fofs - fofs) < (fi->ext.len >> 1)) { | |
154 | fi->ext.len = fofs - start_fofs; | |
155 | } else { | |
156 | fi->ext.fofs = fofs + 1; | |
157 | fi->ext.blk_addr = start_blkaddr + | |
158 | fofs - start_fofs + 1; | |
159 | fi->ext.len -= fofs - start_fofs + 1; | |
160 | } | |
161 | goto end_update; | |
162 | } | |
163 | write_unlock(&fi->ext.ext_lock); | |
164 | return; | |
165 | ||
166 | end_update: | |
167 | write_unlock(&fi->ext.ext_lock); | |
168 | sync_inode_page(dn); | |
169 | return; | |
170 | } | |
171 | ||
172 | struct page *find_data_page(struct inode *inode, pgoff_t index) | |
173 | { | |
174 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
175 | struct address_space *mapping = inode->i_mapping; | |
176 | struct dnode_of_data dn; | |
177 | struct page *page; | |
178 | int err; | |
179 | ||
180 | page = find_get_page(mapping, index); | |
181 | if (page && PageUptodate(page)) | |
182 | return page; | |
183 | f2fs_put_page(page, 0); | |
184 | ||
185 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
186 | err = get_dnode_of_data(&dn, index, RDONLY_NODE); | |
187 | if (err) | |
188 | return ERR_PTR(err); | |
189 | f2fs_put_dnode(&dn); | |
190 | ||
191 | if (dn.data_blkaddr == NULL_ADDR) | |
192 | return ERR_PTR(-ENOENT); | |
193 | ||
194 | /* By fallocate(), there is no cached page, but with NEW_ADDR */ | |
195 | if (dn.data_blkaddr == NEW_ADDR) | |
196 | return ERR_PTR(-EINVAL); | |
197 | ||
198 | page = grab_cache_page(mapping, index); | |
199 | if (!page) | |
200 | return ERR_PTR(-ENOMEM); | |
201 | ||
202 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
203 | if (err) { | |
204 | f2fs_put_page(page, 1); | |
205 | return ERR_PTR(err); | |
206 | } | |
207 | unlock_page(page); | |
208 | return page; | |
209 | } | |
210 | ||
0a8165d7 | 211 | /* |
eb47b800 JK |
212 | * If it tries to access a hole, return an error. |
213 | * Because, the callers, functions in dir.c and GC, should be able to know | |
214 | * whether this page exists or not. | |
215 | */ | |
216 | struct page *get_lock_data_page(struct inode *inode, pgoff_t index) | |
217 | { | |
218 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
219 | struct address_space *mapping = inode->i_mapping; | |
220 | struct dnode_of_data dn; | |
221 | struct page *page; | |
222 | int err; | |
223 | ||
224 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
225 | err = get_dnode_of_data(&dn, index, RDONLY_NODE); | |
226 | if (err) | |
227 | return ERR_PTR(err); | |
228 | f2fs_put_dnode(&dn); | |
229 | ||
230 | if (dn.data_blkaddr == NULL_ADDR) | |
231 | return ERR_PTR(-ENOENT); | |
232 | ||
233 | page = grab_cache_page(mapping, index); | |
234 | if (!page) | |
235 | return ERR_PTR(-ENOMEM); | |
236 | ||
237 | if (PageUptodate(page)) | |
238 | return page; | |
239 | ||
240 | BUG_ON(dn.data_blkaddr == NEW_ADDR); | |
241 | BUG_ON(dn.data_blkaddr == NULL_ADDR); | |
242 | ||
243 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
244 | if (err) { | |
245 | f2fs_put_page(page, 1); | |
246 | return ERR_PTR(err); | |
247 | } | |
248 | return page; | |
249 | } | |
250 | ||
0a8165d7 | 251 | /* |
eb47b800 JK |
252 | * Caller ensures that this data page is never allocated. |
253 | * A new zero-filled data page is allocated in the page cache. | |
254 | */ | |
255 | struct page *get_new_data_page(struct inode *inode, pgoff_t index, | |
256 | bool new_i_size) | |
257 | { | |
258 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
259 | struct address_space *mapping = inode->i_mapping; | |
260 | struct page *page; | |
261 | struct dnode_of_data dn; | |
262 | int err; | |
263 | ||
264 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
265 | err = get_dnode_of_data(&dn, index, 0); | |
266 | if (err) | |
267 | return ERR_PTR(err); | |
268 | ||
269 | if (dn.data_blkaddr == NULL_ADDR) { | |
270 | if (reserve_new_block(&dn)) { | |
271 | f2fs_put_dnode(&dn); | |
272 | return ERR_PTR(-ENOSPC); | |
273 | } | |
274 | } | |
275 | f2fs_put_dnode(&dn); | |
276 | ||
277 | page = grab_cache_page(mapping, index); | |
278 | if (!page) | |
279 | return ERR_PTR(-ENOMEM); | |
280 | ||
281 | if (PageUptodate(page)) | |
282 | return page; | |
283 | ||
284 | if (dn.data_blkaddr == NEW_ADDR) { | |
285 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
286 | } else { | |
287 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
288 | if (err) { | |
289 | f2fs_put_page(page, 1); | |
290 | return ERR_PTR(err); | |
291 | } | |
292 | } | |
293 | SetPageUptodate(page); | |
294 | ||
295 | if (new_i_size && | |
296 | i_size_read(inode) < ((index + 1) << PAGE_CACHE_SHIFT)) { | |
297 | i_size_write(inode, ((index + 1) << PAGE_CACHE_SHIFT)); | |
298 | mark_inode_dirty_sync(inode); | |
299 | } | |
300 | return page; | |
301 | } | |
302 | ||
303 | static void read_end_io(struct bio *bio, int err) | |
304 | { | |
305 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
306 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | |
307 | ||
308 | do { | |
309 | struct page *page = bvec->bv_page; | |
310 | ||
311 | if (--bvec >= bio->bi_io_vec) | |
312 | prefetchw(&bvec->bv_page->flags); | |
313 | ||
314 | if (uptodate) { | |
315 | SetPageUptodate(page); | |
316 | } else { | |
317 | ClearPageUptodate(page); | |
318 | SetPageError(page); | |
319 | } | |
320 | unlock_page(page); | |
321 | } while (bvec >= bio->bi_io_vec); | |
322 | kfree(bio->bi_private); | |
323 | bio_put(bio); | |
324 | } | |
325 | ||
0a8165d7 | 326 | /* |
eb47b800 JK |
327 | * Fill the locked page with data located in the block address. |
328 | * Read operation is synchronous, and caller must unlock the page. | |
329 | */ | |
330 | int f2fs_readpage(struct f2fs_sb_info *sbi, struct page *page, | |
331 | block_t blk_addr, int type) | |
332 | { | |
333 | struct block_device *bdev = sbi->sb->s_bdev; | |
334 | bool sync = (type == READ_SYNC); | |
335 | struct bio *bio; | |
336 | ||
337 | /* This page can be already read by other threads */ | |
338 | if (PageUptodate(page)) { | |
339 | if (!sync) | |
340 | unlock_page(page); | |
341 | return 0; | |
342 | } | |
343 | ||
344 | down_read(&sbi->bio_sem); | |
345 | ||
346 | /* Allocate a new bio */ | |
3cd8a239 | 347 | bio = f2fs_bio_alloc(bdev, 1); |
eb47b800 JK |
348 | |
349 | /* Initialize the bio */ | |
3cd8a239 | 350 | bio->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr); |
eb47b800 | 351 | bio->bi_end_io = read_end_io; |
3cd8a239 | 352 | |
eb47b800 JK |
353 | if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) { |
354 | kfree(bio->bi_private); | |
355 | bio_put(bio); | |
356 | up_read(&sbi->bio_sem); | |
357 | return -EFAULT; | |
358 | } | |
359 | ||
360 | submit_bio(type, bio); | |
361 | up_read(&sbi->bio_sem); | |
362 | ||
363 | /* wait for read completion if sync */ | |
364 | if (sync) { | |
365 | lock_page(page); | |
366 | if (PageError(page)) | |
367 | return -EIO; | |
368 | } | |
369 | return 0; | |
370 | } | |
371 | ||
0a8165d7 | 372 | /* |
eb47b800 JK |
373 | * This function should be used by the data read flow only where it |
374 | * does not check the "create" flag that indicates block allocation. | |
375 | * The reason for this special functionality is to exploit VFS readahead | |
376 | * mechanism. | |
377 | */ | |
378 | static int get_data_block_ro(struct inode *inode, sector_t iblock, | |
379 | struct buffer_head *bh_result, int create) | |
380 | { | |
381 | unsigned int blkbits = inode->i_sb->s_blocksize_bits; | |
382 | unsigned maxblocks = bh_result->b_size >> blkbits; | |
383 | struct dnode_of_data dn; | |
384 | pgoff_t pgofs; | |
385 | int err; | |
386 | ||
387 | /* Get the page offset from the block offset(iblock) */ | |
388 | pgofs = (pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits)); | |
389 | ||
390 | if (check_extent_cache(inode, pgofs, bh_result)) | |
391 | return 0; | |
392 | ||
393 | /* When reading holes, we need its node page */ | |
394 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
395 | err = get_dnode_of_data(&dn, pgofs, RDONLY_NODE); | |
396 | if (err) | |
397 | return (err == -ENOENT) ? 0 : err; | |
398 | ||
399 | /* It does not support data allocation */ | |
400 | BUG_ON(create); | |
401 | ||
402 | if (dn.data_blkaddr != NEW_ADDR && dn.data_blkaddr != NULL_ADDR) { | |
403 | int i; | |
404 | unsigned int end_offset; | |
405 | ||
406 | end_offset = IS_INODE(dn.node_page) ? | |
407 | ADDRS_PER_INODE : | |
408 | ADDRS_PER_BLOCK; | |
409 | ||
410 | clear_buffer_new(bh_result); | |
411 | ||
412 | /* Give more consecutive addresses for the read ahead */ | |
413 | for (i = 0; i < end_offset - dn.ofs_in_node; i++) | |
414 | if (((datablock_addr(dn.node_page, | |
415 | dn.ofs_in_node + i)) | |
416 | != (dn.data_blkaddr + i)) || maxblocks == i) | |
417 | break; | |
418 | map_bh(bh_result, inode->i_sb, dn.data_blkaddr); | |
419 | bh_result->b_size = (i << blkbits); | |
420 | } | |
421 | f2fs_put_dnode(&dn); | |
422 | return 0; | |
423 | } | |
424 | ||
425 | static int f2fs_read_data_page(struct file *file, struct page *page) | |
426 | { | |
427 | return mpage_readpage(page, get_data_block_ro); | |
428 | } | |
429 | ||
430 | static int f2fs_read_data_pages(struct file *file, | |
431 | struct address_space *mapping, | |
432 | struct list_head *pages, unsigned nr_pages) | |
433 | { | |
434 | return mpage_readpages(mapping, pages, nr_pages, get_data_block_ro); | |
435 | } | |
436 | ||
437 | int do_write_data_page(struct page *page) | |
438 | { | |
439 | struct inode *inode = page->mapping->host; | |
440 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
441 | block_t old_blk_addr, new_blk_addr; | |
442 | struct dnode_of_data dn; | |
443 | int err = 0; | |
444 | ||
445 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
446 | err = get_dnode_of_data(&dn, page->index, RDONLY_NODE); | |
447 | if (err) | |
448 | return err; | |
449 | ||
450 | old_blk_addr = dn.data_blkaddr; | |
451 | ||
452 | /* This page is already truncated */ | |
453 | if (old_blk_addr == NULL_ADDR) | |
454 | goto out_writepage; | |
455 | ||
456 | set_page_writeback(page); | |
457 | ||
458 | /* | |
459 | * If current allocation needs SSR, | |
460 | * it had better in-place writes for updated data. | |
461 | */ | |
462 | if (old_blk_addr != NEW_ADDR && !is_cold_data(page) && | |
463 | need_inplace_update(inode)) { | |
464 | rewrite_data_page(F2FS_SB(inode->i_sb), page, | |
465 | old_blk_addr); | |
466 | } else { | |
467 | write_data_page(inode, page, &dn, | |
468 | old_blk_addr, &new_blk_addr); | |
469 | update_extent_cache(new_blk_addr, &dn); | |
470 | F2FS_I(inode)->data_version = | |
471 | le64_to_cpu(F2FS_CKPT(sbi)->checkpoint_ver); | |
472 | } | |
473 | out_writepage: | |
474 | f2fs_put_dnode(&dn); | |
475 | return err; | |
476 | } | |
477 | ||
478 | static int f2fs_write_data_page(struct page *page, | |
479 | struct writeback_control *wbc) | |
480 | { | |
481 | struct inode *inode = page->mapping->host; | |
482 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
483 | loff_t i_size = i_size_read(inode); | |
484 | const pgoff_t end_index = ((unsigned long long) i_size) | |
485 | >> PAGE_CACHE_SHIFT; | |
486 | unsigned offset; | |
487 | int err = 0; | |
488 | ||
489 | if (page->index < end_index) | |
490 | goto out; | |
491 | ||
492 | /* | |
493 | * If the offset is out-of-range of file size, | |
494 | * this page does not have to be written to disk. | |
495 | */ | |
496 | offset = i_size & (PAGE_CACHE_SIZE - 1); | |
497 | if ((page->index >= end_index + 1) || !offset) { | |
498 | if (S_ISDIR(inode->i_mode)) { | |
499 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
500 | inode_dec_dirty_dents(inode); | |
501 | } | |
502 | goto unlock_out; | |
503 | } | |
504 | ||
505 | zero_user_segment(page, offset, PAGE_CACHE_SIZE); | |
506 | out: | |
507 | if (sbi->por_doing) | |
508 | goto redirty_out; | |
509 | ||
510 | if (wbc->for_reclaim && !S_ISDIR(inode->i_mode) && !is_cold_data(page)) | |
511 | goto redirty_out; | |
512 | ||
513 | mutex_lock_op(sbi, DATA_WRITE); | |
514 | if (S_ISDIR(inode->i_mode)) { | |
515 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
516 | inode_dec_dirty_dents(inode); | |
517 | } | |
518 | err = do_write_data_page(page); | |
519 | if (err && err != -ENOENT) { | |
520 | wbc->pages_skipped++; | |
521 | set_page_dirty(page); | |
522 | } | |
523 | mutex_unlock_op(sbi, DATA_WRITE); | |
524 | ||
525 | if (wbc->for_reclaim) | |
526 | f2fs_submit_bio(sbi, DATA, true); | |
527 | ||
528 | if (err == -ENOENT) | |
529 | goto unlock_out; | |
530 | ||
531 | clear_cold_data(page); | |
532 | unlock_page(page); | |
533 | ||
534 | if (!wbc->for_reclaim && !S_ISDIR(inode->i_mode)) | |
535 | f2fs_balance_fs(sbi); | |
536 | return 0; | |
537 | ||
538 | unlock_out: | |
539 | unlock_page(page); | |
540 | return (err == -ENOENT) ? 0 : err; | |
541 | ||
542 | redirty_out: | |
543 | wbc->pages_skipped++; | |
544 | set_page_dirty(page); | |
545 | return AOP_WRITEPAGE_ACTIVATE; | |
546 | } | |
547 | ||
548 | #define MAX_DESIRED_PAGES_WP 4096 | |
549 | ||
25ca923b | 550 | static int f2fs_write_data_pages(struct address_space *mapping, |
eb47b800 JK |
551 | struct writeback_control *wbc) |
552 | { | |
553 | struct inode *inode = mapping->host; | |
554 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
555 | int ret; | |
556 | long excess_nrtw = 0, desired_nrtw; | |
557 | ||
558 | if (wbc->nr_to_write < MAX_DESIRED_PAGES_WP) { | |
559 | desired_nrtw = MAX_DESIRED_PAGES_WP; | |
560 | excess_nrtw = desired_nrtw - wbc->nr_to_write; | |
561 | wbc->nr_to_write = desired_nrtw; | |
562 | } | |
563 | ||
564 | if (!S_ISDIR(inode->i_mode)) | |
565 | mutex_lock(&sbi->writepages); | |
566 | ret = generic_writepages(mapping, wbc); | |
567 | if (!S_ISDIR(inode->i_mode)) | |
568 | mutex_unlock(&sbi->writepages); | |
569 | f2fs_submit_bio(sbi, DATA, (wbc->sync_mode == WB_SYNC_ALL)); | |
570 | ||
571 | remove_dirty_dir_inode(inode); | |
572 | ||
573 | wbc->nr_to_write -= excess_nrtw; | |
574 | return ret; | |
575 | } | |
576 | ||
577 | static int f2fs_write_begin(struct file *file, struct address_space *mapping, | |
578 | loff_t pos, unsigned len, unsigned flags, | |
579 | struct page **pagep, void **fsdata) | |
580 | { | |
581 | struct inode *inode = mapping->host; | |
582 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
583 | struct page *page; | |
584 | pgoff_t index = ((unsigned long long) pos) >> PAGE_CACHE_SHIFT; | |
585 | struct dnode_of_data dn; | |
586 | int err = 0; | |
587 | ||
588 | /* for nobh_write_end */ | |
589 | *fsdata = NULL; | |
590 | ||
591 | f2fs_balance_fs(sbi); | |
592 | ||
593 | page = grab_cache_page_write_begin(mapping, index, flags); | |
594 | if (!page) | |
595 | return -ENOMEM; | |
596 | *pagep = page; | |
597 | ||
598 | mutex_lock_op(sbi, DATA_NEW); | |
599 | ||
600 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
601 | err = get_dnode_of_data(&dn, index, 0); | |
602 | if (err) { | |
603 | mutex_unlock_op(sbi, DATA_NEW); | |
604 | f2fs_put_page(page, 1); | |
605 | return err; | |
606 | } | |
607 | ||
608 | if (dn.data_blkaddr == NULL_ADDR) { | |
609 | err = reserve_new_block(&dn); | |
610 | if (err) { | |
611 | f2fs_put_dnode(&dn); | |
612 | mutex_unlock_op(sbi, DATA_NEW); | |
613 | f2fs_put_page(page, 1); | |
614 | return err; | |
615 | } | |
616 | } | |
617 | f2fs_put_dnode(&dn); | |
618 | ||
619 | mutex_unlock_op(sbi, DATA_NEW); | |
620 | ||
621 | if ((len == PAGE_CACHE_SIZE) || PageUptodate(page)) | |
622 | return 0; | |
623 | ||
624 | if ((pos & PAGE_CACHE_MASK) >= i_size_read(inode)) { | |
625 | unsigned start = pos & (PAGE_CACHE_SIZE - 1); | |
626 | unsigned end = start + len; | |
627 | ||
628 | /* Reading beyond i_size is simple: memset to zero */ | |
629 | zero_user_segments(page, 0, start, end, PAGE_CACHE_SIZE); | |
630 | return 0; | |
631 | } | |
632 | ||
633 | if (dn.data_blkaddr == NEW_ADDR) { | |
634 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
635 | } else { | |
636 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
637 | if (err) { | |
638 | f2fs_put_page(page, 1); | |
639 | return err; | |
640 | } | |
641 | } | |
642 | SetPageUptodate(page); | |
643 | clear_cold_data(page); | |
644 | return 0; | |
645 | } | |
646 | ||
647 | static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb, | |
648 | const struct iovec *iov, loff_t offset, unsigned long nr_segs) | |
649 | { | |
650 | struct file *file = iocb->ki_filp; | |
651 | struct inode *inode = file->f_mapping->host; | |
652 | ||
653 | if (rw == WRITE) | |
654 | return 0; | |
655 | ||
656 | /* Needs synchronization with the cleaner */ | |
657 | return blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs, | |
658 | get_data_block_ro); | |
659 | } | |
660 | ||
661 | static void f2fs_invalidate_data_page(struct page *page, unsigned long offset) | |
662 | { | |
663 | struct inode *inode = page->mapping->host; | |
664 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
665 | if (S_ISDIR(inode->i_mode) && PageDirty(page)) { | |
666 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
667 | inode_dec_dirty_dents(inode); | |
668 | } | |
669 | ClearPagePrivate(page); | |
670 | } | |
671 | ||
672 | static int f2fs_release_data_page(struct page *page, gfp_t wait) | |
673 | { | |
674 | ClearPagePrivate(page); | |
675 | return 0; | |
676 | } | |
677 | ||
678 | static int f2fs_set_data_page_dirty(struct page *page) | |
679 | { | |
680 | struct address_space *mapping = page->mapping; | |
681 | struct inode *inode = mapping->host; | |
682 | ||
683 | SetPageUptodate(page); | |
684 | if (!PageDirty(page)) { | |
685 | __set_page_dirty_nobuffers(page); | |
686 | set_dirty_dir_page(inode, page); | |
687 | return 1; | |
688 | } | |
689 | return 0; | |
690 | } | |
691 | ||
692 | const struct address_space_operations f2fs_dblock_aops = { | |
693 | .readpage = f2fs_read_data_page, | |
694 | .readpages = f2fs_read_data_pages, | |
695 | .writepage = f2fs_write_data_page, | |
696 | .writepages = f2fs_write_data_pages, | |
697 | .write_begin = f2fs_write_begin, | |
698 | .write_end = nobh_write_end, | |
699 | .set_page_dirty = f2fs_set_data_page_dirty, | |
700 | .invalidatepage = f2fs_invalidate_data_page, | |
701 | .releasepage = f2fs_release_data_page, | |
702 | .direct_IO = f2fs_direct_IO, | |
703 | }; |