]>
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> | |
a27bb332 | 15 | #include <linux/aio.h> |
eb47b800 JK |
16 | #include <linux/writeback.h> |
17 | #include <linux/backing-dev.h> | |
18 | #include <linux/blkdev.h> | |
19 | #include <linux/bio.h> | |
690e4a3e | 20 | #include <linux/prefetch.h> |
eb47b800 JK |
21 | |
22 | #include "f2fs.h" | |
23 | #include "node.h" | |
24 | #include "segment.h" | |
848753aa | 25 | #include <trace/events/f2fs.h> |
eb47b800 | 26 | |
0a8165d7 | 27 | /* |
eb47b800 JK |
28 | * Lock ordering for the change of data block address: |
29 | * ->data_page | |
30 | * ->node_page | |
31 | * update block addresses in the node page | |
32 | */ | |
33 | static void __set_data_blkaddr(struct dnode_of_data *dn, block_t new_addr) | |
34 | { | |
35 | struct f2fs_node *rn; | |
36 | __le32 *addr_array; | |
37 | struct page *node_page = dn->node_page; | |
38 | unsigned int ofs_in_node = dn->ofs_in_node; | |
39 | ||
a569469e | 40 | f2fs_wait_on_page_writeback(node_page, NODE, false); |
eb47b800 | 41 | |
45590710 | 42 | rn = F2FS_NODE(node_page); |
eb47b800 JK |
43 | |
44 | /* Get physical address of data block */ | |
45 | addr_array = blkaddr_in_node(rn); | |
46 | addr_array[ofs_in_node] = cpu_to_le32(new_addr); | |
47 | set_page_dirty(node_page); | |
48 | } | |
49 | ||
50 | int reserve_new_block(struct dnode_of_data *dn) | |
51 | { | |
52 | struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb); | |
53 | ||
54 | if (is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)) | |
55 | return -EPERM; | |
56 | if (!inc_valid_block_count(sbi, dn->inode, 1)) | |
57 | return -ENOSPC; | |
58 | ||
c01e2853 NJ |
59 | trace_f2fs_reserve_new_block(dn->inode, dn->nid, dn->ofs_in_node); |
60 | ||
eb47b800 JK |
61 | __set_data_blkaddr(dn, NEW_ADDR); |
62 | dn->data_blkaddr = NEW_ADDR; | |
63 | sync_inode_page(dn); | |
64 | return 0; | |
65 | } | |
66 | ||
67 | static int check_extent_cache(struct inode *inode, pgoff_t pgofs, | |
68 | struct buffer_head *bh_result) | |
69 | { | |
70 | struct f2fs_inode_info *fi = F2FS_I(inode); | |
35b09d82 | 71 | #ifdef CONFIG_F2FS_STAT_FS |
eb47b800 | 72 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); |
35b09d82 | 73 | #endif |
eb47b800 JK |
74 | pgoff_t start_fofs, end_fofs; |
75 | block_t start_blkaddr; | |
76 | ||
77 | read_lock(&fi->ext.ext_lock); | |
78 | if (fi->ext.len == 0) { | |
79 | read_unlock(&fi->ext.ext_lock); | |
80 | return 0; | |
81 | } | |
82 | ||
35b09d82 | 83 | #ifdef CONFIG_F2FS_STAT_FS |
eb47b800 | 84 | sbi->total_hit_ext++; |
35b09d82 | 85 | #endif |
eb47b800 JK |
86 | start_fofs = fi->ext.fofs; |
87 | end_fofs = fi->ext.fofs + fi->ext.len - 1; | |
88 | start_blkaddr = fi->ext.blk_addr; | |
89 | ||
90 | if (pgofs >= start_fofs && pgofs <= end_fofs) { | |
91 | unsigned int blkbits = inode->i_sb->s_blocksize_bits; | |
92 | size_t count; | |
93 | ||
94 | clear_buffer_new(bh_result); | |
95 | map_bh(bh_result, inode->i_sb, | |
96 | start_blkaddr + pgofs - start_fofs); | |
97 | count = end_fofs - pgofs + 1; | |
98 | if (count < (UINT_MAX >> blkbits)) | |
99 | bh_result->b_size = (count << blkbits); | |
100 | else | |
101 | bh_result->b_size = UINT_MAX; | |
102 | ||
35b09d82 | 103 | #ifdef CONFIG_F2FS_STAT_FS |
eb47b800 | 104 | sbi->read_hit_ext++; |
35b09d82 | 105 | #endif |
eb47b800 JK |
106 | read_unlock(&fi->ext.ext_lock); |
107 | return 1; | |
108 | } | |
109 | read_unlock(&fi->ext.ext_lock); | |
110 | return 0; | |
111 | } | |
112 | ||
113 | void update_extent_cache(block_t blk_addr, struct dnode_of_data *dn) | |
114 | { | |
115 | struct f2fs_inode_info *fi = F2FS_I(dn->inode); | |
116 | pgoff_t fofs, start_fofs, end_fofs; | |
117 | block_t start_blkaddr, end_blkaddr; | |
118 | ||
119 | BUG_ON(blk_addr == NEW_ADDR); | |
de93653f JK |
120 | fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) + |
121 | dn->ofs_in_node; | |
eb47b800 JK |
122 | |
123 | /* Update the page address in the parent node */ | |
124 | __set_data_blkaddr(dn, blk_addr); | |
125 | ||
126 | write_lock(&fi->ext.ext_lock); | |
127 | ||
128 | start_fofs = fi->ext.fofs; | |
129 | end_fofs = fi->ext.fofs + fi->ext.len - 1; | |
130 | start_blkaddr = fi->ext.blk_addr; | |
131 | end_blkaddr = fi->ext.blk_addr + fi->ext.len - 1; | |
132 | ||
133 | /* Drop and initialize the matched extent */ | |
134 | if (fi->ext.len == 1 && fofs == start_fofs) | |
135 | fi->ext.len = 0; | |
136 | ||
137 | /* Initial extent */ | |
138 | if (fi->ext.len == 0) { | |
139 | if (blk_addr != NULL_ADDR) { | |
140 | fi->ext.fofs = fofs; | |
141 | fi->ext.blk_addr = blk_addr; | |
142 | fi->ext.len = 1; | |
143 | } | |
144 | goto end_update; | |
145 | } | |
146 | ||
6224da87 | 147 | /* Front merge */ |
eb47b800 JK |
148 | if (fofs == start_fofs - 1 && blk_addr == start_blkaddr - 1) { |
149 | fi->ext.fofs--; | |
150 | fi->ext.blk_addr--; | |
151 | fi->ext.len++; | |
152 | goto end_update; | |
153 | } | |
154 | ||
155 | /* Back merge */ | |
156 | if (fofs == end_fofs + 1 && blk_addr == end_blkaddr + 1) { | |
157 | fi->ext.len++; | |
158 | goto end_update; | |
159 | } | |
160 | ||
161 | /* Split the existing extent */ | |
162 | if (fi->ext.len > 1 && | |
163 | fofs >= start_fofs && fofs <= end_fofs) { | |
164 | if ((end_fofs - fofs) < (fi->ext.len >> 1)) { | |
165 | fi->ext.len = fofs - start_fofs; | |
166 | } else { | |
167 | fi->ext.fofs = fofs + 1; | |
168 | fi->ext.blk_addr = start_blkaddr + | |
169 | fofs - start_fofs + 1; | |
170 | fi->ext.len -= fofs - start_fofs + 1; | |
171 | } | |
172 | goto end_update; | |
173 | } | |
174 | write_unlock(&fi->ext.ext_lock); | |
175 | return; | |
176 | ||
177 | end_update: | |
178 | write_unlock(&fi->ext.ext_lock); | |
179 | sync_inode_page(dn); | |
eb47b800 JK |
180 | } |
181 | ||
c718379b | 182 | struct page *find_data_page(struct inode *inode, pgoff_t index, bool sync) |
eb47b800 JK |
183 | { |
184 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
185 | struct address_space *mapping = inode->i_mapping; | |
186 | struct dnode_of_data dn; | |
187 | struct page *page; | |
188 | int err; | |
189 | ||
190 | page = find_get_page(mapping, index); | |
191 | if (page && PageUptodate(page)) | |
192 | return page; | |
193 | f2fs_put_page(page, 0); | |
194 | ||
195 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 196 | err = get_dnode_of_data(&dn, index, LOOKUP_NODE); |
eb47b800 JK |
197 | if (err) |
198 | return ERR_PTR(err); | |
199 | f2fs_put_dnode(&dn); | |
200 | ||
201 | if (dn.data_blkaddr == NULL_ADDR) | |
202 | return ERR_PTR(-ENOENT); | |
203 | ||
204 | /* By fallocate(), there is no cached page, but with NEW_ADDR */ | |
205 | if (dn.data_blkaddr == NEW_ADDR) | |
206 | return ERR_PTR(-EINVAL); | |
207 | ||
6f85b352 | 208 | page = grab_cache_page_write_begin(mapping, index, AOP_FLAG_NOFS); |
eb47b800 JK |
209 | if (!page) |
210 | return ERR_PTR(-ENOMEM); | |
211 | ||
393ff91f JK |
212 | if (PageUptodate(page)) { |
213 | unlock_page(page); | |
214 | return page; | |
215 | } | |
216 | ||
c718379b JK |
217 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, |
218 | sync ? READ_SYNC : READA); | |
219 | if (sync) { | |
220 | wait_on_page_locked(page); | |
221 | if (!PageUptodate(page)) { | |
222 | f2fs_put_page(page, 0); | |
223 | return ERR_PTR(-EIO); | |
224 | } | |
eb47b800 | 225 | } |
eb47b800 JK |
226 | return page; |
227 | } | |
228 | ||
0a8165d7 | 229 | /* |
eb47b800 JK |
230 | * If it tries to access a hole, return an error. |
231 | * Because, the callers, functions in dir.c and GC, should be able to know | |
232 | * whether this page exists or not. | |
233 | */ | |
234 | struct page *get_lock_data_page(struct inode *inode, pgoff_t index) | |
235 | { | |
236 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
237 | struct address_space *mapping = inode->i_mapping; | |
238 | struct dnode_of_data dn; | |
239 | struct page *page; | |
240 | int err; | |
241 | ||
650495de | 242 | repeat: |
6f85b352 | 243 | page = grab_cache_page_write_begin(mapping, index, AOP_FLAG_NOFS); |
650495de JK |
244 | if (!page) |
245 | return ERR_PTR(-ENOMEM); | |
246 | ||
eb47b800 | 247 | set_new_dnode(&dn, inode, NULL, NULL, 0); |
266e97a8 | 248 | err = get_dnode_of_data(&dn, index, LOOKUP_NODE); |
650495de JK |
249 | if (err) { |
250 | f2fs_put_page(page, 1); | |
eb47b800 | 251 | return ERR_PTR(err); |
650495de | 252 | } |
eb47b800 JK |
253 | f2fs_put_dnode(&dn); |
254 | ||
650495de JK |
255 | if (dn.data_blkaddr == NULL_ADDR) { |
256 | f2fs_put_page(page, 1); | |
eb47b800 | 257 | return ERR_PTR(-ENOENT); |
650495de | 258 | } |
eb47b800 JK |
259 | |
260 | if (PageUptodate(page)) | |
261 | return page; | |
262 | ||
d59ff4df JK |
263 | /* |
264 | * A new dentry page is allocated but not able to be written, since its | |
265 | * new inode page couldn't be allocated due to -ENOSPC. | |
266 | * In such the case, its blkaddr can be remained as NEW_ADDR. | |
267 | * see, f2fs_add_link -> get_new_data_page -> init_inode_metadata. | |
268 | */ | |
269 | if (dn.data_blkaddr == NEW_ADDR) { | |
270 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
271 | SetPageUptodate(page); | |
272 | return page; | |
273 | } | |
eb47b800 JK |
274 | |
275 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
393ff91f | 276 | if (err) |
eb47b800 | 277 | return ERR_PTR(err); |
393ff91f JK |
278 | |
279 | lock_page(page); | |
280 | if (!PageUptodate(page)) { | |
281 | f2fs_put_page(page, 1); | |
282 | return ERR_PTR(-EIO); | |
eb47b800 | 283 | } |
afcb7ca0 JK |
284 | if (page->mapping != mapping) { |
285 | f2fs_put_page(page, 1); | |
286 | goto repeat; | |
eb47b800 JK |
287 | } |
288 | return page; | |
289 | } | |
290 | ||
0a8165d7 | 291 | /* |
eb47b800 JK |
292 | * Caller ensures that this data page is never allocated. |
293 | * A new zero-filled data page is allocated in the page cache. | |
39936837 JK |
294 | * |
295 | * Also, caller should grab and release a mutex by calling mutex_lock_op() and | |
296 | * mutex_unlock_op(). | |
44a83ff6 | 297 | * Note that, npage is set only by make_empty_dir. |
eb47b800 | 298 | */ |
64aa7ed9 JK |
299 | struct page *get_new_data_page(struct inode *inode, |
300 | struct page *npage, pgoff_t index, bool new_i_size) | |
eb47b800 JK |
301 | { |
302 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
303 | struct address_space *mapping = inode->i_mapping; | |
304 | struct page *page; | |
305 | struct dnode_of_data dn; | |
306 | int err; | |
307 | ||
64aa7ed9 | 308 | set_new_dnode(&dn, inode, npage, npage, 0); |
266e97a8 | 309 | err = get_dnode_of_data(&dn, index, ALLOC_NODE); |
eb47b800 JK |
310 | if (err) |
311 | return ERR_PTR(err); | |
312 | ||
313 | if (dn.data_blkaddr == NULL_ADDR) { | |
314 | if (reserve_new_block(&dn)) { | |
64aa7ed9 JK |
315 | if (!npage) |
316 | f2fs_put_dnode(&dn); | |
eb47b800 JK |
317 | return ERR_PTR(-ENOSPC); |
318 | } | |
319 | } | |
64aa7ed9 JK |
320 | if (!npage) |
321 | f2fs_put_dnode(&dn); | |
afcb7ca0 | 322 | repeat: |
eb47b800 JK |
323 | page = grab_cache_page(mapping, index); |
324 | if (!page) | |
325 | return ERR_PTR(-ENOMEM); | |
326 | ||
327 | if (PageUptodate(page)) | |
328 | return page; | |
329 | ||
330 | if (dn.data_blkaddr == NEW_ADDR) { | |
331 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
393ff91f | 332 | SetPageUptodate(page); |
eb47b800 JK |
333 | } else { |
334 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
393ff91f | 335 | if (err) |
eb47b800 | 336 | return ERR_PTR(err); |
393ff91f JK |
337 | lock_page(page); |
338 | if (!PageUptodate(page)) { | |
339 | f2fs_put_page(page, 1); | |
340 | return ERR_PTR(-EIO); | |
eb47b800 | 341 | } |
afcb7ca0 JK |
342 | if (page->mapping != mapping) { |
343 | f2fs_put_page(page, 1); | |
344 | goto repeat; | |
eb47b800 JK |
345 | } |
346 | } | |
eb47b800 JK |
347 | |
348 | if (new_i_size && | |
349 | i_size_read(inode) < ((index + 1) << PAGE_CACHE_SHIFT)) { | |
350 | i_size_write(inode, ((index + 1) << PAGE_CACHE_SHIFT)); | |
699489bb JK |
351 | /* Only the directory inode sets new_i_size */ |
352 | set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR); | |
eb47b800 JK |
353 | mark_inode_dirty_sync(inode); |
354 | } | |
355 | return page; | |
356 | } | |
357 | ||
358 | static void read_end_io(struct bio *bio, int err) | |
359 | { | |
360 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
361 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | |
362 | ||
363 | do { | |
364 | struct page *page = bvec->bv_page; | |
365 | ||
366 | if (--bvec >= bio->bi_io_vec) | |
367 | prefetchw(&bvec->bv_page->flags); | |
368 | ||
369 | if (uptodate) { | |
370 | SetPageUptodate(page); | |
371 | } else { | |
372 | ClearPageUptodate(page); | |
373 | SetPageError(page); | |
374 | } | |
375 | unlock_page(page); | |
376 | } while (bvec >= bio->bi_io_vec); | |
eb47b800 JK |
377 | bio_put(bio); |
378 | } | |
379 | ||
0a8165d7 | 380 | /* |
eb47b800 | 381 | * Fill the locked page with data located in the block address. |
393ff91f | 382 | * Return unlocked page. |
eb47b800 JK |
383 | */ |
384 | int f2fs_readpage(struct f2fs_sb_info *sbi, struct page *page, | |
385 | block_t blk_addr, int type) | |
386 | { | |
387 | struct block_device *bdev = sbi->sb->s_bdev; | |
eb47b800 JK |
388 | struct bio *bio; |
389 | ||
848753aa | 390 | trace_f2fs_readpage(page, blk_addr, type); |
eb47b800 JK |
391 | |
392 | down_read(&sbi->bio_sem); | |
393 | ||
394 | /* Allocate a new bio */ | |
3cd8a239 | 395 | bio = f2fs_bio_alloc(bdev, 1); |
eb47b800 JK |
396 | |
397 | /* Initialize the bio */ | |
3cd8a239 | 398 | bio->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr); |
eb47b800 | 399 | bio->bi_end_io = read_end_io; |
3cd8a239 | 400 | |
eb47b800 | 401 | if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) { |
eb47b800 JK |
402 | bio_put(bio); |
403 | up_read(&sbi->bio_sem); | |
393ff91f | 404 | f2fs_put_page(page, 1); |
eb47b800 JK |
405 | return -EFAULT; |
406 | } | |
407 | ||
408 | submit_bio(type, bio); | |
409 | up_read(&sbi->bio_sem); | |
eb47b800 JK |
410 | return 0; |
411 | } | |
412 | ||
0a8165d7 | 413 | /* |
eb47b800 JK |
414 | * This function should be used by the data read flow only where it |
415 | * does not check the "create" flag that indicates block allocation. | |
416 | * The reason for this special functionality is to exploit VFS readahead | |
417 | * mechanism. | |
418 | */ | |
419 | static int get_data_block_ro(struct inode *inode, sector_t iblock, | |
420 | struct buffer_head *bh_result, int create) | |
421 | { | |
422 | unsigned int blkbits = inode->i_sb->s_blocksize_bits; | |
423 | unsigned maxblocks = bh_result->b_size >> blkbits; | |
424 | struct dnode_of_data dn; | |
425 | pgoff_t pgofs; | |
426 | int err; | |
427 | ||
428 | /* Get the page offset from the block offset(iblock) */ | |
429 | pgofs = (pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits)); | |
430 | ||
848753aa NJ |
431 | if (check_extent_cache(inode, pgofs, bh_result)) { |
432 | trace_f2fs_get_data_block(inode, iblock, bh_result, 0); | |
eb47b800 | 433 | return 0; |
848753aa | 434 | } |
eb47b800 JK |
435 | |
436 | /* When reading holes, we need its node page */ | |
437 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 438 | err = get_dnode_of_data(&dn, pgofs, LOOKUP_NODE_RA); |
848753aa NJ |
439 | if (err) { |
440 | trace_f2fs_get_data_block(inode, iblock, bh_result, err); | |
eb47b800 | 441 | return (err == -ENOENT) ? 0 : err; |
848753aa | 442 | } |
eb47b800 JK |
443 | |
444 | /* It does not support data allocation */ | |
445 | BUG_ON(create); | |
446 | ||
447 | if (dn.data_blkaddr != NEW_ADDR && dn.data_blkaddr != NULL_ADDR) { | |
448 | int i; | |
449 | unsigned int end_offset; | |
450 | ||
451 | end_offset = IS_INODE(dn.node_page) ? | |
de93653f | 452 | ADDRS_PER_INODE(F2FS_I(inode)) : |
eb47b800 JK |
453 | ADDRS_PER_BLOCK; |
454 | ||
455 | clear_buffer_new(bh_result); | |
456 | ||
457 | /* Give more consecutive addresses for the read ahead */ | |
458 | for (i = 0; i < end_offset - dn.ofs_in_node; i++) | |
459 | if (((datablock_addr(dn.node_page, | |
460 | dn.ofs_in_node + i)) | |
461 | != (dn.data_blkaddr + i)) || maxblocks == i) | |
462 | break; | |
463 | map_bh(bh_result, inode->i_sb, dn.data_blkaddr); | |
464 | bh_result->b_size = (i << blkbits); | |
465 | } | |
466 | f2fs_put_dnode(&dn); | |
848753aa | 467 | trace_f2fs_get_data_block(inode, iblock, bh_result, 0); |
eb47b800 JK |
468 | return 0; |
469 | } | |
470 | ||
471 | static int f2fs_read_data_page(struct file *file, struct page *page) | |
472 | { | |
473 | return mpage_readpage(page, get_data_block_ro); | |
474 | } | |
475 | ||
476 | static int f2fs_read_data_pages(struct file *file, | |
477 | struct address_space *mapping, | |
478 | struct list_head *pages, unsigned nr_pages) | |
479 | { | |
480 | return mpage_readpages(mapping, pages, nr_pages, get_data_block_ro); | |
481 | } | |
482 | ||
483 | int do_write_data_page(struct page *page) | |
484 | { | |
485 | struct inode *inode = page->mapping->host; | |
eb47b800 JK |
486 | block_t old_blk_addr, new_blk_addr; |
487 | struct dnode_of_data dn; | |
488 | int err = 0; | |
489 | ||
490 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 491 | err = get_dnode_of_data(&dn, page->index, LOOKUP_NODE); |
eb47b800 JK |
492 | if (err) |
493 | return err; | |
494 | ||
495 | old_blk_addr = dn.data_blkaddr; | |
496 | ||
497 | /* This page is already truncated */ | |
498 | if (old_blk_addr == NULL_ADDR) | |
499 | goto out_writepage; | |
500 | ||
501 | set_page_writeback(page); | |
502 | ||
503 | /* | |
504 | * If current allocation needs SSR, | |
505 | * it had better in-place writes for updated data. | |
506 | */ | |
b25958b6 HL |
507 | if (unlikely(old_blk_addr != NEW_ADDR && |
508 | !is_cold_data(page) && | |
509 | need_inplace_update(inode))) { | |
eb47b800 JK |
510 | rewrite_data_page(F2FS_SB(inode->i_sb), page, |
511 | old_blk_addr); | |
512 | } else { | |
513 | write_data_page(inode, page, &dn, | |
514 | old_blk_addr, &new_blk_addr); | |
515 | update_extent_cache(new_blk_addr, &dn); | |
eb47b800 JK |
516 | } |
517 | out_writepage: | |
518 | f2fs_put_dnode(&dn); | |
519 | return err; | |
520 | } | |
521 | ||
522 | static int f2fs_write_data_page(struct page *page, | |
523 | struct writeback_control *wbc) | |
524 | { | |
525 | struct inode *inode = page->mapping->host; | |
526 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
527 | loff_t i_size = i_size_read(inode); | |
528 | const pgoff_t end_index = ((unsigned long long) i_size) | |
529 | >> PAGE_CACHE_SHIFT; | |
530 | unsigned offset; | |
39936837 | 531 | bool need_balance_fs = false; |
eb47b800 JK |
532 | int err = 0; |
533 | ||
534 | if (page->index < end_index) | |
39936837 | 535 | goto write; |
eb47b800 JK |
536 | |
537 | /* | |
538 | * If the offset is out-of-range of file size, | |
539 | * this page does not have to be written to disk. | |
540 | */ | |
541 | offset = i_size & (PAGE_CACHE_SIZE - 1); | |
542 | if ((page->index >= end_index + 1) || !offset) { | |
543 | if (S_ISDIR(inode->i_mode)) { | |
544 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
545 | inode_dec_dirty_dents(inode); | |
546 | } | |
39936837 | 547 | goto out; |
eb47b800 JK |
548 | } |
549 | ||
550 | zero_user_segment(page, offset, PAGE_CACHE_SIZE); | |
39936837 JK |
551 | write: |
552 | if (sbi->por_doing) { | |
553 | err = AOP_WRITEPAGE_ACTIVATE; | |
eb47b800 | 554 | goto redirty_out; |
39936837 | 555 | } |
eb47b800 | 556 | |
39936837 | 557 | /* Dentry blocks are controlled by checkpoint */ |
eb47b800 JK |
558 | if (S_ISDIR(inode->i_mode)) { |
559 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
560 | inode_dec_dirty_dents(inode); | |
39936837 JK |
561 | err = do_write_data_page(page); |
562 | } else { | |
563 | int ilock = mutex_lock_op(sbi); | |
564 | err = do_write_data_page(page); | |
565 | mutex_unlock_op(sbi, ilock); | |
566 | need_balance_fs = true; | |
eb47b800 | 567 | } |
39936837 JK |
568 | if (err == -ENOENT) |
569 | goto out; | |
570 | else if (err) | |
571 | goto redirty_out; | |
eb47b800 JK |
572 | |
573 | if (wbc->for_reclaim) | |
574 | f2fs_submit_bio(sbi, DATA, true); | |
575 | ||
eb47b800 | 576 | clear_cold_data(page); |
39936837 | 577 | out: |
eb47b800 | 578 | unlock_page(page); |
39936837 | 579 | if (need_balance_fs) |
eb47b800 JK |
580 | f2fs_balance_fs(sbi); |
581 | return 0; | |
582 | ||
eb47b800 JK |
583 | redirty_out: |
584 | wbc->pages_skipped++; | |
585 | set_page_dirty(page); | |
39936837 | 586 | return err; |
eb47b800 JK |
587 | } |
588 | ||
589 | #define MAX_DESIRED_PAGES_WP 4096 | |
590 | ||
fa9150a8 NJ |
591 | static int __f2fs_writepage(struct page *page, struct writeback_control *wbc, |
592 | void *data) | |
593 | { | |
594 | struct address_space *mapping = data; | |
595 | int ret = mapping->a_ops->writepage(page, wbc); | |
596 | mapping_set_error(mapping, ret); | |
597 | return ret; | |
598 | } | |
599 | ||
25ca923b | 600 | static int f2fs_write_data_pages(struct address_space *mapping, |
eb47b800 JK |
601 | struct writeback_control *wbc) |
602 | { | |
603 | struct inode *inode = mapping->host; | |
604 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
531ad7d5 | 605 | bool locked = false; |
eb47b800 JK |
606 | int ret; |
607 | long excess_nrtw = 0, desired_nrtw; | |
608 | ||
cfb185a1 | 609 | /* deal with chardevs and other special file */ |
610 | if (!mapping->a_ops->writepage) | |
611 | return 0; | |
612 | ||
eb47b800 JK |
613 | if (wbc->nr_to_write < MAX_DESIRED_PAGES_WP) { |
614 | desired_nrtw = MAX_DESIRED_PAGES_WP; | |
615 | excess_nrtw = desired_nrtw - wbc->nr_to_write; | |
616 | wbc->nr_to_write = desired_nrtw; | |
617 | } | |
618 | ||
531ad7d5 | 619 | if (!S_ISDIR(inode->i_mode)) { |
eb47b800 | 620 | mutex_lock(&sbi->writepages); |
531ad7d5 JK |
621 | locked = true; |
622 | } | |
fa9150a8 | 623 | ret = write_cache_pages(mapping, wbc, __f2fs_writepage, mapping); |
531ad7d5 | 624 | if (locked) |
eb47b800 JK |
625 | mutex_unlock(&sbi->writepages); |
626 | f2fs_submit_bio(sbi, DATA, (wbc->sync_mode == WB_SYNC_ALL)); | |
627 | ||
628 | remove_dirty_dir_inode(inode); | |
629 | ||
630 | wbc->nr_to_write -= excess_nrtw; | |
631 | return ret; | |
632 | } | |
633 | ||
634 | static int f2fs_write_begin(struct file *file, struct address_space *mapping, | |
635 | loff_t pos, unsigned len, unsigned flags, | |
636 | struct page **pagep, void **fsdata) | |
637 | { | |
638 | struct inode *inode = mapping->host; | |
639 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
640 | struct page *page; | |
641 | pgoff_t index = ((unsigned long long) pos) >> PAGE_CACHE_SHIFT; | |
642 | struct dnode_of_data dn; | |
643 | int err = 0; | |
39936837 | 644 | int ilock; |
eb47b800 | 645 | |
eb47b800 | 646 | f2fs_balance_fs(sbi); |
afcb7ca0 | 647 | repeat: |
eb47b800 JK |
648 | page = grab_cache_page_write_begin(mapping, index, flags); |
649 | if (!page) | |
650 | return -ENOMEM; | |
651 | *pagep = page; | |
652 | ||
39936837 | 653 | ilock = mutex_lock_op(sbi); |
eb47b800 JK |
654 | |
655 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 656 | err = get_dnode_of_data(&dn, index, ALLOC_NODE); |
39936837 JK |
657 | if (err) |
658 | goto err; | |
eb47b800 | 659 | |
39936837 | 660 | if (dn.data_blkaddr == NULL_ADDR) |
eb47b800 | 661 | err = reserve_new_block(&dn); |
39936837 | 662 | |
eb47b800 | 663 | f2fs_put_dnode(&dn); |
39936837 JK |
664 | if (err) |
665 | goto err; | |
eb47b800 | 666 | |
39936837 | 667 | mutex_unlock_op(sbi, ilock); |
eb47b800 JK |
668 | |
669 | if ((len == PAGE_CACHE_SIZE) || PageUptodate(page)) | |
670 | return 0; | |
671 | ||
672 | if ((pos & PAGE_CACHE_MASK) >= i_size_read(inode)) { | |
673 | unsigned start = pos & (PAGE_CACHE_SIZE - 1); | |
674 | unsigned end = start + len; | |
675 | ||
676 | /* Reading beyond i_size is simple: memset to zero */ | |
677 | zero_user_segments(page, 0, start, end, PAGE_CACHE_SIZE); | |
393ff91f | 678 | goto out; |
eb47b800 JK |
679 | } |
680 | ||
681 | if (dn.data_blkaddr == NEW_ADDR) { | |
682 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
683 | } else { | |
684 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
393ff91f | 685 | if (err) |
eb47b800 | 686 | return err; |
393ff91f JK |
687 | lock_page(page); |
688 | if (!PageUptodate(page)) { | |
689 | f2fs_put_page(page, 1); | |
690 | return -EIO; | |
eb47b800 | 691 | } |
afcb7ca0 JK |
692 | if (page->mapping != mapping) { |
693 | f2fs_put_page(page, 1); | |
694 | goto repeat; | |
eb47b800 JK |
695 | } |
696 | } | |
393ff91f | 697 | out: |
eb47b800 JK |
698 | SetPageUptodate(page); |
699 | clear_cold_data(page); | |
700 | return 0; | |
39936837 JK |
701 | |
702 | err: | |
703 | mutex_unlock_op(sbi, ilock); | |
704 | f2fs_put_page(page, 1); | |
705 | return err; | |
eb47b800 JK |
706 | } |
707 | ||
a1dd3c13 JK |
708 | static int f2fs_write_end(struct file *file, |
709 | struct address_space *mapping, | |
710 | loff_t pos, unsigned len, unsigned copied, | |
711 | struct page *page, void *fsdata) | |
712 | { | |
713 | struct inode *inode = page->mapping->host; | |
714 | ||
715 | SetPageUptodate(page); | |
716 | set_page_dirty(page); | |
717 | ||
718 | if (pos + copied > i_size_read(inode)) { | |
719 | i_size_write(inode, pos + copied); | |
720 | mark_inode_dirty(inode); | |
721 | update_inode_page(inode); | |
722 | } | |
723 | ||
724 | unlock_page(page); | |
725 | page_cache_release(page); | |
726 | return copied; | |
727 | } | |
728 | ||
eb47b800 JK |
729 | static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb, |
730 | const struct iovec *iov, loff_t offset, unsigned long nr_segs) | |
731 | { | |
732 | struct file *file = iocb->ki_filp; | |
733 | struct inode *inode = file->f_mapping->host; | |
734 | ||
735 | if (rw == WRITE) | |
736 | return 0; | |
737 | ||
738 | /* Needs synchronization with the cleaner */ | |
739 | return blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs, | |
740 | get_data_block_ro); | |
741 | } | |
742 | ||
d47992f8 LC |
743 | static void f2fs_invalidate_data_page(struct page *page, unsigned int offset, |
744 | unsigned int length) | |
eb47b800 JK |
745 | { |
746 | struct inode *inode = page->mapping->host; | |
747 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
748 | if (S_ISDIR(inode->i_mode) && PageDirty(page)) { | |
749 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
750 | inode_dec_dirty_dents(inode); | |
751 | } | |
752 | ClearPagePrivate(page); | |
753 | } | |
754 | ||
755 | static int f2fs_release_data_page(struct page *page, gfp_t wait) | |
756 | { | |
757 | ClearPagePrivate(page); | |
c3850aa1 | 758 | return 1; |
eb47b800 JK |
759 | } |
760 | ||
761 | static int f2fs_set_data_page_dirty(struct page *page) | |
762 | { | |
763 | struct address_space *mapping = page->mapping; | |
764 | struct inode *inode = mapping->host; | |
765 | ||
766 | SetPageUptodate(page); | |
767 | if (!PageDirty(page)) { | |
768 | __set_page_dirty_nobuffers(page); | |
769 | set_dirty_dir_page(inode, page); | |
770 | return 1; | |
771 | } | |
772 | return 0; | |
773 | } | |
774 | ||
c01e54b7 JK |
775 | static sector_t f2fs_bmap(struct address_space *mapping, sector_t block) |
776 | { | |
777 | return generic_block_bmap(mapping, block, get_data_block_ro); | |
778 | } | |
779 | ||
eb47b800 JK |
780 | const struct address_space_operations f2fs_dblock_aops = { |
781 | .readpage = f2fs_read_data_page, | |
782 | .readpages = f2fs_read_data_pages, | |
783 | .writepage = f2fs_write_data_page, | |
784 | .writepages = f2fs_write_data_pages, | |
785 | .write_begin = f2fs_write_begin, | |
a1dd3c13 | 786 | .write_end = f2fs_write_end, |
eb47b800 JK |
787 | .set_page_dirty = f2fs_set_data_page_dirty, |
788 | .invalidatepage = f2fs_invalidate_data_page, | |
789 | .releasepage = f2fs_release_data_page, | |
790 | .direct_IO = f2fs_direct_IO, | |
c01e54b7 | 791 | .bmap = f2fs_bmap, |
eb47b800 | 792 | }; |