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" | |
848753aa | 24 | #include <trace/events/f2fs.h> |
eb47b800 | 25 | |
0a8165d7 | 26 | /* |
eb47b800 JK |
27 | * Lock ordering for the change of data block address: |
28 | * ->data_page | |
29 | * ->node_page | |
30 | * update block addresses in the node page | |
31 | */ | |
32 | static void __set_data_blkaddr(struct dnode_of_data *dn, block_t new_addr) | |
33 | { | |
34 | struct f2fs_node *rn; | |
35 | __le32 *addr_array; | |
36 | struct page *node_page = dn->node_page; | |
37 | unsigned int ofs_in_node = dn->ofs_in_node; | |
38 | ||
39 | wait_on_page_writeback(node_page); | |
40 | ||
41 | rn = (struct f2fs_node *)page_address(node_page); | |
42 | ||
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); | |
47 | } | |
48 | ||
49 | int reserve_new_block(struct dnode_of_data *dn) | |
50 | { | |
51 | struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb); | |
52 | ||
53 | if (is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)) | |
54 | return -EPERM; | |
55 | if (!inc_valid_block_count(sbi, dn->inode, 1)) | |
56 | return -ENOSPC; | |
57 | ||
c01e2853 NJ |
58 | trace_f2fs_reserve_new_block(dn->inode, dn->nid, dn->ofs_in_node); |
59 | ||
eb47b800 JK |
60 | __set_data_blkaddr(dn, NEW_ADDR); |
61 | dn->data_blkaddr = NEW_ADDR; | |
62 | sync_inode_page(dn); | |
63 | return 0; | |
64 | } | |
65 | ||
66 | static int check_extent_cache(struct inode *inode, pgoff_t pgofs, | |
67 | struct buffer_head *bh_result) | |
68 | { | |
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; | |
73 | ||
74 | read_lock(&fi->ext.ext_lock); | |
75 | if (fi->ext.len == 0) { | |
76 | read_unlock(&fi->ext.ext_lock); | |
77 | return 0; | |
78 | } | |
79 | ||
80 | sbi->total_hit_ext++; | |
81 | start_fofs = fi->ext.fofs; | |
82 | end_fofs = fi->ext.fofs + fi->ext.len - 1; | |
83 | start_blkaddr = fi->ext.blk_addr; | |
84 | ||
85 | if (pgofs >= start_fofs && pgofs <= end_fofs) { | |
86 | unsigned int blkbits = inode->i_sb->s_blocksize_bits; | |
87 | size_t count; | |
88 | ||
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); | |
95 | else | |
96 | bh_result->b_size = UINT_MAX; | |
97 | ||
98 | sbi->read_hit_ext++; | |
99 | read_unlock(&fi->ext.ext_lock); | |
100 | return 1; | |
101 | } | |
102 | read_unlock(&fi->ext.ext_lock); | |
103 | return 0; | |
104 | } | |
105 | ||
106 | void update_extent_cache(block_t blk_addr, struct dnode_of_data *dn) | |
107 | { | |
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; | |
111 | ||
112 | BUG_ON(blk_addr == NEW_ADDR); | |
113 | fofs = start_bidx_of_node(ofs_of_node(dn->node_page)) + dn->ofs_in_node; | |
114 | ||
115 | /* Update the page address in the parent node */ | |
116 | __set_data_blkaddr(dn, blk_addr); | |
117 | ||
118 | write_lock(&fi->ext.ext_lock); | |
119 | ||
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; | |
124 | ||
125 | /* Drop and initialize the matched extent */ | |
126 | if (fi->ext.len == 1 && fofs == start_fofs) | |
127 | fi->ext.len = 0; | |
128 | ||
129 | /* Initial extent */ | |
130 | if (fi->ext.len == 0) { | |
131 | if (blk_addr != NULL_ADDR) { | |
132 | fi->ext.fofs = fofs; | |
133 | fi->ext.blk_addr = blk_addr; | |
134 | fi->ext.len = 1; | |
135 | } | |
136 | goto end_update; | |
137 | } | |
138 | ||
6224da87 | 139 | /* Front merge */ |
eb47b800 JK |
140 | if (fofs == start_fofs - 1 && blk_addr == start_blkaddr - 1) { |
141 | fi->ext.fofs--; | |
142 | fi->ext.blk_addr--; | |
143 | fi->ext.len++; | |
144 | goto end_update; | |
145 | } | |
146 | ||
147 | /* Back merge */ | |
148 | if (fofs == end_fofs + 1 && blk_addr == end_blkaddr + 1) { | |
149 | fi->ext.len++; | |
150 | goto end_update; | |
151 | } | |
152 | ||
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; | |
158 | } else { | |
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; | |
163 | } | |
164 | goto end_update; | |
165 | } | |
166 | write_unlock(&fi->ext.ext_lock); | |
167 | return; | |
168 | ||
169 | end_update: | |
170 | write_unlock(&fi->ext.ext_lock); | |
171 | sync_inode_page(dn); | |
172 | return; | |
173 | } | |
174 | ||
c718379b | 175 | struct page *find_data_page(struct inode *inode, pgoff_t index, bool sync) |
eb47b800 JK |
176 | { |
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; | |
180 | struct page *page; | |
181 | int err; | |
182 | ||
183 | page = find_get_page(mapping, index); | |
184 | if (page && PageUptodate(page)) | |
185 | return page; | |
186 | f2fs_put_page(page, 0); | |
187 | ||
188 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 189 | err = get_dnode_of_data(&dn, index, LOOKUP_NODE); |
eb47b800 JK |
190 | if (err) |
191 | return ERR_PTR(err); | |
192 | f2fs_put_dnode(&dn); | |
193 | ||
194 | if (dn.data_blkaddr == NULL_ADDR) | |
195 | return ERR_PTR(-ENOENT); | |
196 | ||
197 | /* By fallocate(), there is no cached page, but with NEW_ADDR */ | |
198 | if (dn.data_blkaddr == NEW_ADDR) | |
199 | return ERR_PTR(-EINVAL); | |
200 | ||
201 | page = grab_cache_page(mapping, index); | |
202 | if (!page) | |
203 | return ERR_PTR(-ENOMEM); | |
204 | ||
393ff91f JK |
205 | if (PageUptodate(page)) { |
206 | unlock_page(page); | |
207 | return page; | |
208 | } | |
209 | ||
c718379b JK |
210 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, |
211 | sync ? READ_SYNC : READA); | |
212 | if (sync) { | |
213 | wait_on_page_locked(page); | |
214 | if (!PageUptodate(page)) { | |
215 | f2fs_put_page(page, 0); | |
216 | return ERR_PTR(-EIO); | |
217 | } | |
eb47b800 | 218 | } |
eb47b800 JK |
219 | return page; |
220 | } | |
221 | ||
0a8165d7 | 222 | /* |
eb47b800 JK |
223 | * If it tries to access a hole, return an error. |
224 | * Because, the callers, functions in dir.c and GC, should be able to know | |
225 | * whether this page exists or not. | |
226 | */ | |
227 | struct page *get_lock_data_page(struct inode *inode, pgoff_t index) | |
228 | { | |
229 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
230 | struct address_space *mapping = inode->i_mapping; | |
231 | struct dnode_of_data dn; | |
232 | struct page *page; | |
233 | int err; | |
234 | ||
235 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 236 | err = get_dnode_of_data(&dn, index, LOOKUP_NODE); |
eb47b800 JK |
237 | if (err) |
238 | return ERR_PTR(err); | |
239 | f2fs_put_dnode(&dn); | |
240 | ||
241 | if (dn.data_blkaddr == NULL_ADDR) | |
242 | return ERR_PTR(-ENOENT); | |
afcb7ca0 | 243 | repeat: |
eb47b800 JK |
244 | page = grab_cache_page(mapping, index); |
245 | if (!page) | |
246 | return ERR_PTR(-ENOMEM); | |
247 | ||
248 | if (PageUptodate(page)) | |
249 | return page; | |
250 | ||
251 | BUG_ON(dn.data_blkaddr == NEW_ADDR); | |
252 | BUG_ON(dn.data_blkaddr == NULL_ADDR); | |
253 | ||
254 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
393ff91f | 255 | if (err) |
eb47b800 | 256 | return ERR_PTR(err); |
393ff91f JK |
257 | |
258 | lock_page(page); | |
259 | if (!PageUptodate(page)) { | |
260 | f2fs_put_page(page, 1); | |
261 | return ERR_PTR(-EIO); | |
eb47b800 | 262 | } |
afcb7ca0 JK |
263 | if (page->mapping != mapping) { |
264 | f2fs_put_page(page, 1); | |
265 | goto repeat; | |
266 | } | |
eb47b800 JK |
267 | return page; |
268 | } | |
269 | ||
0a8165d7 | 270 | /* |
eb47b800 JK |
271 | * Caller ensures that this data page is never allocated. |
272 | * A new zero-filled data page is allocated in the page cache. | |
39936837 JK |
273 | * |
274 | * Also, caller should grab and release a mutex by calling mutex_lock_op() and | |
275 | * mutex_unlock_op(). | |
eb47b800 JK |
276 | */ |
277 | struct page *get_new_data_page(struct inode *inode, pgoff_t index, | |
278 | bool new_i_size) | |
279 | { | |
280 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
281 | struct address_space *mapping = inode->i_mapping; | |
282 | struct page *page; | |
283 | struct dnode_of_data dn; | |
284 | int err; | |
285 | ||
286 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 287 | err = get_dnode_of_data(&dn, index, ALLOC_NODE); |
eb47b800 JK |
288 | if (err) |
289 | return ERR_PTR(err); | |
290 | ||
291 | if (dn.data_blkaddr == NULL_ADDR) { | |
292 | if (reserve_new_block(&dn)) { | |
293 | f2fs_put_dnode(&dn); | |
294 | return ERR_PTR(-ENOSPC); | |
295 | } | |
296 | } | |
297 | f2fs_put_dnode(&dn); | |
afcb7ca0 | 298 | repeat: |
eb47b800 JK |
299 | page = grab_cache_page(mapping, index); |
300 | if (!page) | |
301 | return ERR_PTR(-ENOMEM); | |
302 | ||
303 | if (PageUptodate(page)) | |
304 | return page; | |
305 | ||
306 | if (dn.data_blkaddr == NEW_ADDR) { | |
307 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
393ff91f | 308 | SetPageUptodate(page); |
eb47b800 JK |
309 | } else { |
310 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
393ff91f | 311 | if (err) |
eb47b800 | 312 | return ERR_PTR(err); |
393ff91f JK |
313 | lock_page(page); |
314 | if (!PageUptodate(page)) { | |
315 | f2fs_put_page(page, 1); | |
316 | return ERR_PTR(-EIO); | |
eb47b800 | 317 | } |
afcb7ca0 JK |
318 | if (page->mapping != mapping) { |
319 | f2fs_put_page(page, 1); | |
320 | goto repeat; | |
321 | } | |
eb47b800 | 322 | } |
eb47b800 JK |
323 | |
324 | if (new_i_size && | |
325 | i_size_read(inode) < ((index + 1) << PAGE_CACHE_SHIFT)) { | |
326 | i_size_write(inode, ((index + 1) << PAGE_CACHE_SHIFT)); | |
327 | mark_inode_dirty_sync(inode); | |
328 | } | |
329 | return page; | |
330 | } | |
331 | ||
332 | static void read_end_io(struct bio *bio, int err) | |
333 | { | |
334 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
335 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | |
336 | ||
337 | do { | |
338 | struct page *page = bvec->bv_page; | |
339 | ||
340 | if (--bvec >= bio->bi_io_vec) | |
341 | prefetchw(&bvec->bv_page->flags); | |
342 | ||
343 | if (uptodate) { | |
344 | SetPageUptodate(page); | |
345 | } else { | |
346 | ClearPageUptodate(page); | |
347 | SetPageError(page); | |
348 | } | |
349 | unlock_page(page); | |
350 | } while (bvec >= bio->bi_io_vec); | |
351 | kfree(bio->bi_private); | |
352 | bio_put(bio); | |
353 | } | |
354 | ||
0a8165d7 | 355 | /* |
eb47b800 | 356 | * Fill the locked page with data located in the block address. |
393ff91f | 357 | * Return unlocked page. |
eb47b800 JK |
358 | */ |
359 | int f2fs_readpage(struct f2fs_sb_info *sbi, struct page *page, | |
360 | block_t blk_addr, int type) | |
361 | { | |
362 | struct block_device *bdev = sbi->sb->s_bdev; | |
eb47b800 JK |
363 | struct bio *bio; |
364 | ||
848753aa NJ |
365 | trace_f2fs_readpage(page, blk_addr, type); |
366 | ||
eb47b800 JK |
367 | down_read(&sbi->bio_sem); |
368 | ||
369 | /* Allocate a new bio */ | |
3cd8a239 | 370 | bio = f2fs_bio_alloc(bdev, 1); |
eb47b800 JK |
371 | |
372 | /* Initialize the bio */ | |
3cd8a239 | 373 | bio->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr); |
eb47b800 | 374 | bio->bi_end_io = read_end_io; |
3cd8a239 | 375 | |
eb47b800 JK |
376 | if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) { |
377 | kfree(bio->bi_private); | |
378 | bio_put(bio); | |
379 | up_read(&sbi->bio_sem); | |
393ff91f | 380 | f2fs_put_page(page, 1); |
eb47b800 JK |
381 | return -EFAULT; |
382 | } | |
383 | ||
384 | submit_bio(type, bio); | |
385 | up_read(&sbi->bio_sem); | |
eb47b800 JK |
386 | return 0; |
387 | } | |
388 | ||
0a8165d7 | 389 | /* |
eb47b800 JK |
390 | * This function should be used by the data read flow only where it |
391 | * does not check the "create" flag that indicates block allocation. | |
392 | * The reason for this special functionality is to exploit VFS readahead | |
393 | * mechanism. | |
394 | */ | |
395 | static int get_data_block_ro(struct inode *inode, sector_t iblock, | |
396 | struct buffer_head *bh_result, int create) | |
397 | { | |
398 | unsigned int blkbits = inode->i_sb->s_blocksize_bits; | |
399 | unsigned maxblocks = bh_result->b_size >> blkbits; | |
400 | struct dnode_of_data dn; | |
401 | pgoff_t pgofs; | |
402 | int err; | |
403 | ||
404 | /* Get the page offset from the block offset(iblock) */ | |
405 | pgofs = (pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits)); | |
406 | ||
848753aa NJ |
407 | if (check_extent_cache(inode, pgofs, bh_result)) { |
408 | trace_f2fs_get_data_block(inode, iblock, bh_result, 0); | |
eb47b800 | 409 | return 0; |
848753aa | 410 | } |
eb47b800 JK |
411 | |
412 | /* When reading holes, we need its node page */ | |
413 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 414 | err = get_dnode_of_data(&dn, pgofs, LOOKUP_NODE_RA); |
848753aa NJ |
415 | if (err) { |
416 | trace_f2fs_get_data_block(inode, iblock, bh_result, err); | |
eb47b800 | 417 | return (err == -ENOENT) ? 0 : err; |
848753aa | 418 | } |
eb47b800 JK |
419 | |
420 | /* It does not support data allocation */ | |
421 | BUG_ON(create); | |
422 | ||
423 | if (dn.data_blkaddr != NEW_ADDR && dn.data_blkaddr != NULL_ADDR) { | |
424 | int i; | |
425 | unsigned int end_offset; | |
426 | ||
427 | end_offset = IS_INODE(dn.node_page) ? | |
428 | ADDRS_PER_INODE : | |
429 | ADDRS_PER_BLOCK; | |
430 | ||
431 | clear_buffer_new(bh_result); | |
432 | ||
433 | /* Give more consecutive addresses for the read ahead */ | |
434 | for (i = 0; i < end_offset - dn.ofs_in_node; i++) | |
435 | if (((datablock_addr(dn.node_page, | |
436 | dn.ofs_in_node + i)) | |
437 | != (dn.data_blkaddr + i)) || maxblocks == i) | |
438 | break; | |
439 | map_bh(bh_result, inode->i_sb, dn.data_blkaddr); | |
440 | bh_result->b_size = (i << blkbits); | |
441 | } | |
442 | f2fs_put_dnode(&dn); | |
848753aa | 443 | trace_f2fs_get_data_block(inode, iblock, bh_result, 0); |
eb47b800 JK |
444 | return 0; |
445 | } | |
446 | ||
447 | static int f2fs_read_data_page(struct file *file, struct page *page) | |
448 | { | |
449 | return mpage_readpage(page, get_data_block_ro); | |
450 | } | |
451 | ||
452 | static int f2fs_read_data_pages(struct file *file, | |
453 | struct address_space *mapping, | |
454 | struct list_head *pages, unsigned nr_pages) | |
455 | { | |
456 | return mpage_readpages(mapping, pages, nr_pages, get_data_block_ro); | |
457 | } | |
458 | ||
459 | int do_write_data_page(struct page *page) | |
460 | { | |
461 | struct inode *inode = page->mapping->host; | |
eb47b800 JK |
462 | block_t old_blk_addr, new_blk_addr; |
463 | struct dnode_of_data dn; | |
464 | int err = 0; | |
465 | ||
466 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 467 | err = get_dnode_of_data(&dn, page->index, LOOKUP_NODE); |
eb47b800 JK |
468 | if (err) |
469 | return err; | |
470 | ||
471 | old_blk_addr = dn.data_blkaddr; | |
472 | ||
473 | /* This page is already truncated */ | |
474 | if (old_blk_addr == NULL_ADDR) | |
475 | goto out_writepage; | |
476 | ||
477 | set_page_writeback(page); | |
478 | ||
479 | /* | |
480 | * If current allocation needs SSR, | |
481 | * it had better in-place writes for updated data. | |
482 | */ | |
483 | if (old_blk_addr != NEW_ADDR && !is_cold_data(page) && | |
484 | need_inplace_update(inode)) { | |
485 | rewrite_data_page(F2FS_SB(inode->i_sb), page, | |
486 | old_blk_addr); | |
487 | } else { | |
488 | write_data_page(inode, page, &dn, | |
489 | old_blk_addr, &new_blk_addr); | |
490 | update_extent_cache(new_blk_addr, &dn); | |
eb47b800 JK |
491 | } |
492 | out_writepage: | |
493 | f2fs_put_dnode(&dn); | |
494 | return err; | |
495 | } | |
496 | ||
497 | static int f2fs_write_data_page(struct page *page, | |
498 | struct writeback_control *wbc) | |
499 | { | |
500 | struct inode *inode = page->mapping->host; | |
501 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
502 | loff_t i_size = i_size_read(inode); | |
503 | const pgoff_t end_index = ((unsigned long long) i_size) | |
504 | >> PAGE_CACHE_SHIFT; | |
505 | unsigned offset; | |
39936837 | 506 | bool need_balance_fs = false; |
eb47b800 JK |
507 | int err = 0; |
508 | ||
509 | if (page->index < end_index) | |
39936837 | 510 | goto write; |
eb47b800 JK |
511 | |
512 | /* | |
513 | * If the offset is out-of-range of file size, | |
514 | * this page does not have to be written to disk. | |
515 | */ | |
516 | offset = i_size & (PAGE_CACHE_SIZE - 1); | |
517 | if ((page->index >= end_index + 1) || !offset) { | |
518 | if (S_ISDIR(inode->i_mode)) { | |
519 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
520 | inode_dec_dirty_dents(inode); | |
521 | } | |
39936837 | 522 | goto out; |
eb47b800 JK |
523 | } |
524 | ||
525 | zero_user_segment(page, offset, PAGE_CACHE_SIZE); | |
39936837 JK |
526 | write: |
527 | if (sbi->por_doing) { | |
528 | err = AOP_WRITEPAGE_ACTIVATE; | |
eb47b800 | 529 | goto redirty_out; |
39936837 | 530 | } |
eb47b800 | 531 | |
39936837 | 532 | /* Dentry blocks are controlled by checkpoint */ |
eb47b800 JK |
533 | if (S_ISDIR(inode->i_mode)) { |
534 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
535 | inode_dec_dirty_dents(inode); | |
39936837 JK |
536 | err = do_write_data_page(page); |
537 | } else { | |
538 | int ilock = mutex_lock_op(sbi); | |
539 | err = do_write_data_page(page); | |
540 | mutex_unlock_op(sbi, ilock); | |
541 | need_balance_fs = true; | |
eb47b800 | 542 | } |
39936837 JK |
543 | if (err == -ENOENT) |
544 | goto out; | |
545 | else if (err) | |
546 | goto redirty_out; | |
eb47b800 JK |
547 | |
548 | if (wbc->for_reclaim) | |
549 | f2fs_submit_bio(sbi, DATA, true); | |
550 | ||
eb47b800 | 551 | clear_cold_data(page); |
39936837 | 552 | out: |
eb47b800 | 553 | unlock_page(page); |
39936837 | 554 | if (need_balance_fs) |
eb47b800 JK |
555 | f2fs_balance_fs(sbi); |
556 | return 0; | |
557 | ||
eb47b800 JK |
558 | redirty_out: |
559 | wbc->pages_skipped++; | |
560 | set_page_dirty(page); | |
39936837 | 561 | return err; |
eb47b800 JK |
562 | } |
563 | ||
564 | #define MAX_DESIRED_PAGES_WP 4096 | |
565 | ||
fa9150a8 NJ |
566 | static int __f2fs_writepage(struct page *page, struct writeback_control *wbc, |
567 | void *data) | |
568 | { | |
569 | struct address_space *mapping = data; | |
570 | int ret = mapping->a_ops->writepage(page, wbc); | |
571 | mapping_set_error(mapping, ret); | |
572 | return ret; | |
573 | } | |
574 | ||
25ca923b | 575 | static int f2fs_write_data_pages(struct address_space *mapping, |
eb47b800 JK |
576 | struct writeback_control *wbc) |
577 | { | |
578 | struct inode *inode = mapping->host; | |
579 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
580 | int ret; | |
581 | long excess_nrtw = 0, desired_nrtw; | |
582 | ||
cfb185a1 | 583 | /* deal with chardevs and other special file */ |
584 | if (!mapping->a_ops->writepage) | |
585 | return 0; | |
586 | ||
eb47b800 JK |
587 | if (wbc->nr_to_write < MAX_DESIRED_PAGES_WP) { |
588 | desired_nrtw = MAX_DESIRED_PAGES_WP; | |
589 | excess_nrtw = desired_nrtw - wbc->nr_to_write; | |
590 | wbc->nr_to_write = desired_nrtw; | |
591 | } | |
592 | ||
593 | if (!S_ISDIR(inode->i_mode)) | |
594 | mutex_lock(&sbi->writepages); | |
fa9150a8 | 595 | ret = write_cache_pages(mapping, wbc, __f2fs_writepage, mapping); |
eb47b800 JK |
596 | if (!S_ISDIR(inode->i_mode)) |
597 | mutex_unlock(&sbi->writepages); | |
598 | f2fs_submit_bio(sbi, DATA, (wbc->sync_mode == WB_SYNC_ALL)); | |
599 | ||
600 | remove_dirty_dir_inode(inode); | |
601 | ||
602 | wbc->nr_to_write -= excess_nrtw; | |
603 | return ret; | |
604 | } | |
605 | ||
606 | static int f2fs_write_begin(struct file *file, struct address_space *mapping, | |
607 | loff_t pos, unsigned len, unsigned flags, | |
608 | struct page **pagep, void **fsdata) | |
609 | { | |
610 | struct inode *inode = mapping->host; | |
611 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
612 | struct page *page; | |
613 | pgoff_t index = ((unsigned long long) pos) >> PAGE_CACHE_SHIFT; | |
614 | struct dnode_of_data dn; | |
615 | int err = 0; | |
39936837 | 616 | int ilock; |
eb47b800 JK |
617 | |
618 | /* for nobh_write_end */ | |
619 | *fsdata = NULL; | |
620 | ||
621 | f2fs_balance_fs(sbi); | |
afcb7ca0 | 622 | repeat: |
eb47b800 JK |
623 | page = grab_cache_page_write_begin(mapping, index, flags); |
624 | if (!page) | |
625 | return -ENOMEM; | |
626 | *pagep = page; | |
627 | ||
39936837 | 628 | ilock = mutex_lock_op(sbi); |
eb47b800 JK |
629 | |
630 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 631 | err = get_dnode_of_data(&dn, index, ALLOC_NODE); |
39936837 JK |
632 | if (err) |
633 | goto err; | |
eb47b800 | 634 | |
39936837 | 635 | if (dn.data_blkaddr == NULL_ADDR) |
eb47b800 | 636 | err = reserve_new_block(&dn); |
39936837 | 637 | |
eb47b800 | 638 | f2fs_put_dnode(&dn); |
39936837 JK |
639 | if (err) |
640 | goto err; | |
eb47b800 | 641 | |
39936837 | 642 | mutex_unlock_op(sbi, ilock); |
eb47b800 JK |
643 | |
644 | if ((len == PAGE_CACHE_SIZE) || PageUptodate(page)) | |
645 | return 0; | |
646 | ||
647 | if ((pos & PAGE_CACHE_MASK) >= i_size_read(inode)) { | |
648 | unsigned start = pos & (PAGE_CACHE_SIZE - 1); | |
649 | unsigned end = start + len; | |
650 | ||
651 | /* Reading beyond i_size is simple: memset to zero */ | |
652 | zero_user_segments(page, 0, start, end, PAGE_CACHE_SIZE); | |
393ff91f | 653 | goto out; |
eb47b800 JK |
654 | } |
655 | ||
656 | if (dn.data_blkaddr == NEW_ADDR) { | |
657 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
658 | } else { | |
659 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
393ff91f | 660 | if (err) |
eb47b800 | 661 | return err; |
393ff91f JK |
662 | lock_page(page); |
663 | if (!PageUptodate(page)) { | |
664 | f2fs_put_page(page, 1); | |
665 | return -EIO; | |
eb47b800 | 666 | } |
afcb7ca0 JK |
667 | if (page->mapping != mapping) { |
668 | f2fs_put_page(page, 1); | |
669 | goto repeat; | |
670 | } | |
eb47b800 | 671 | } |
393ff91f | 672 | out: |
eb47b800 JK |
673 | SetPageUptodate(page); |
674 | clear_cold_data(page); | |
675 | return 0; | |
39936837 JK |
676 | |
677 | err: | |
678 | mutex_unlock_op(sbi, ilock); | |
679 | f2fs_put_page(page, 1); | |
680 | return err; | |
eb47b800 JK |
681 | } |
682 | ||
683 | static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb, | |
684 | const struct iovec *iov, loff_t offset, unsigned long nr_segs) | |
685 | { | |
686 | struct file *file = iocb->ki_filp; | |
687 | struct inode *inode = file->f_mapping->host; | |
688 | ||
689 | if (rw == WRITE) | |
690 | return 0; | |
691 | ||
692 | /* Needs synchronization with the cleaner */ | |
693 | return blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs, | |
694 | get_data_block_ro); | |
695 | } | |
696 | ||
697 | static void f2fs_invalidate_data_page(struct page *page, unsigned long offset) | |
698 | { | |
699 | struct inode *inode = page->mapping->host; | |
700 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
701 | if (S_ISDIR(inode->i_mode) && PageDirty(page)) { | |
702 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
703 | inode_dec_dirty_dents(inode); | |
704 | } | |
705 | ClearPagePrivate(page); | |
706 | } | |
707 | ||
708 | static int f2fs_release_data_page(struct page *page, gfp_t wait) | |
709 | { | |
710 | ClearPagePrivate(page); | |
c3850aa1 | 711 | return 1; |
eb47b800 JK |
712 | } |
713 | ||
714 | static int f2fs_set_data_page_dirty(struct page *page) | |
715 | { | |
716 | struct address_space *mapping = page->mapping; | |
717 | struct inode *inode = mapping->host; | |
718 | ||
719 | SetPageUptodate(page); | |
720 | if (!PageDirty(page)) { | |
721 | __set_page_dirty_nobuffers(page); | |
722 | set_dirty_dir_page(inode, page); | |
723 | return 1; | |
724 | } | |
725 | return 0; | |
726 | } | |
727 | ||
c01e54b7 JK |
728 | static sector_t f2fs_bmap(struct address_space *mapping, sector_t block) |
729 | { | |
730 | return generic_block_bmap(mapping, block, get_data_block_ro); | |
731 | } | |
732 | ||
eb47b800 JK |
733 | const struct address_space_operations f2fs_dblock_aops = { |
734 | .readpage = f2fs_read_data_page, | |
735 | .readpages = f2fs_read_data_pages, | |
736 | .writepage = f2fs_write_data_page, | |
737 | .writepages = f2fs_write_data_pages, | |
738 | .write_begin = f2fs_write_begin, | |
739 | .write_end = nobh_write_end, | |
740 | .set_page_dirty = f2fs_set_data_page_dirty, | |
741 | .invalidatepage = f2fs_invalidate_data_page, | |
742 | .releasepage = f2fs_release_data_page, | |
743 | .direct_IO = f2fs_direct_IO, | |
c01e54b7 | 744 | .bmap = f2fs_bmap, |
eb47b800 | 745 | }; |