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); | |
eb47b800 JK |
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 | ||
dcdfff65 JK |
80 | stat_inc_total_hit(inode->i_sb); |
81 | ||
eb47b800 JK |
82 | start_fofs = fi->ext.fofs; |
83 | end_fofs = fi->ext.fofs + fi->ext.len - 1; | |
84 | start_blkaddr = fi->ext.blk_addr; | |
85 | ||
86 | if (pgofs >= start_fofs && pgofs <= end_fofs) { | |
87 | unsigned int blkbits = inode->i_sb->s_blocksize_bits; | |
88 | size_t count; | |
89 | ||
90 | clear_buffer_new(bh_result); | |
91 | map_bh(bh_result, inode->i_sb, | |
92 | start_blkaddr + pgofs - start_fofs); | |
93 | count = end_fofs - pgofs + 1; | |
94 | if (count < (UINT_MAX >> blkbits)) | |
95 | bh_result->b_size = (count << blkbits); | |
96 | else | |
97 | bh_result->b_size = UINT_MAX; | |
98 | ||
dcdfff65 | 99 | stat_inc_read_hit(inode->i_sb); |
eb47b800 JK |
100 | read_unlock(&fi->ext.ext_lock); |
101 | return 1; | |
102 | } | |
103 | read_unlock(&fi->ext.ext_lock); | |
104 | return 0; | |
105 | } | |
106 | ||
107 | void update_extent_cache(block_t blk_addr, struct dnode_of_data *dn) | |
108 | { | |
109 | struct f2fs_inode_info *fi = F2FS_I(dn->inode); | |
110 | pgoff_t fofs, start_fofs, end_fofs; | |
111 | block_t start_blkaddr, end_blkaddr; | |
112 | ||
5d56b671 | 113 | f2fs_bug_on(blk_addr == NEW_ADDR); |
de93653f JK |
114 | fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) + |
115 | dn->ofs_in_node; | |
eb47b800 JK |
116 | |
117 | /* Update the page address in the parent node */ | |
118 | __set_data_blkaddr(dn, blk_addr); | |
119 | ||
120 | write_lock(&fi->ext.ext_lock); | |
121 | ||
122 | start_fofs = fi->ext.fofs; | |
123 | end_fofs = fi->ext.fofs + fi->ext.len - 1; | |
124 | start_blkaddr = fi->ext.blk_addr; | |
125 | end_blkaddr = fi->ext.blk_addr + fi->ext.len - 1; | |
126 | ||
127 | /* Drop and initialize the matched extent */ | |
128 | if (fi->ext.len == 1 && fofs == start_fofs) | |
129 | fi->ext.len = 0; | |
130 | ||
131 | /* Initial extent */ | |
132 | if (fi->ext.len == 0) { | |
133 | if (blk_addr != NULL_ADDR) { | |
134 | fi->ext.fofs = fofs; | |
135 | fi->ext.blk_addr = blk_addr; | |
136 | fi->ext.len = 1; | |
137 | } | |
138 | goto end_update; | |
139 | } | |
140 | ||
6224da87 | 141 | /* Front merge */ |
eb47b800 JK |
142 | if (fofs == start_fofs - 1 && blk_addr == start_blkaddr - 1) { |
143 | fi->ext.fofs--; | |
144 | fi->ext.blk_addr--; | |
145 | fi->ext.len++; | |
146 | goto end_update; | |
147 | } | |
148 | ||
149 | /* Back merge */ | |
150 | if (fofs == end_fofs + 1 && blk_addr == end_blkaddr + 1) { | |
151 | fi->ext.len++; | |
152 | goto end_update; | |
153 | } | |
154 | ||
155 | /* Split the existing extent */ | |
156 | if (fi->ext.len > 1 && | |
157 | fofs >= start_fofs && fofs <= end_fofs) { | |
158 | if ((end_fofs - fofs) < (fi->ext.len >> 1)) { | |
159 | fi->ext.len = fofs - start_fofs; | |
160 | } else { | |
161 | fi->ext.fofs = fofs + 1; | |
162 | fi->ext.blk_addr = start_blkaddr + | |
163 | fofs - start_fofs + 1; | |
164 | fi->ext.len -= fofs - start_fofs + 1; | |
165 | } | |
166 | goto end_update; | |
167 | } | |
168 | write_unlock(&fi->ext.ext_lock); | |
169 | return; | |
170 | ||
171 | end_update: | |
172 | write_unlock(&fi->ext.ext_lock); | |
173 | sync_inode_page(dn); | |
eb47b800 JK |
174 | } |
175 | ||
c718379b | 176 | struct page *find_data_page(struct inode *inode, pgoff_t index, bool sync) |
eb47b800 JK |
177 | { |
178 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
179 | struct address_space *mapping = inode->i_mapping; | |
180 | struct dnode_of_data dn; | |
181 | struct page *page; | |
182 | int err; | |
183 | ||
184 | page = find_get_page(mapping, index); | |
185 | if (page && PageUptodate(page)) | |
186 | return page; | |
187 | f2fs_put_page(page, 0); | |
188 | ||
189 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 190 | err = get_dnode_of_data(&dn, index, LOOKUP_NODE); |
eb47b800 JK |
191 | if (err) |
192 | return ERR_PTR(err); | |
193 | f2fs_put_dnode(&dn); | |
194 | ||
195 | if (dn.data_blkaddr == NULL_ADDR) | |
196 | return ERR_PTR(-ENOENT); | |
197 | ||
198 | /* By fallocate(), there is no cached page, but with NEW_ADDR */ | |
199 | if (dn.data_blkaddr == NEW_ADDR) | |
200 | return ERR_PTR(-EINVAL); | |
201 | ||
6f85b352 | 202 | page = grab_cache_page_write_begin(mapping, index, AOP_FLAG_NOFS); |
eb47b800 JK |
203 | if (!page) |
204 | return ERR_PTR(-ENOMEM); | |
205 | ||
393ff91f JK |
206 | if (PageUptodate(page)) { |
207 | unlock_page(page); | |
208 | return page; | |
209 | } | |
210 | ||
c718379b JK |
211 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, |
212 | sync ? READ_SYNC : READA); | |
213 | if (sync) { | |
214 | wait_on_page_locked(page); | |
215 | if (!PageUptodate(page)) { | |
216 | f2fs_put_page(page, 0); | |
217 | return ERR_PTR(-EIO); | |
218 | } | |
eb47b800 | 219 | } |
eb47b800 JK |
220 | return page; |
221 | } | |
222 | ||
0a8165d7 | 223 | /* |
eb47b800 JK |
224 | * If it tries to access a hole, return an error. |
225 | * Because, the callers, functions in dir.c and GC, should be able to know | |
226 | * whether this page exists or not. | |
227 | */ | |
228 | struct page *get_lock_data_page(struct inode *inode, pgoff_t index) | |
229 | { | |
230 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
231 | struct address_space *mapping = inode->i_mapping; | |
232 | struct dnode_of_data dn; | |
233 | struct page *page; | |
234 | int err; | |
235 | ||
650495de | 236 | repeat: |
6f85b352 | 237 | page = grab_cache_page_write_begin(mapping, index, AOP_FLAG_NOFS); |
650495de JK |
238 | if (!page) |
239 | return ERR_PTR(-ENOMEM); | |
240 | ||
eb47b800 | 241 | set_new_dnode(&dn, inode, NULL, NULL, 0); |
266e97a8 | 242 | err = get_dnode_of_data(&dn, index, LOOKUP_NODE); |
650495de JK |
243 | if (err) { |
244 | f2fs_put_page(page, 1); | |
eb47b800 | 245 | return ERR_PTR(err); |
650495de | 246 | } |
eb47b800 JK |
247 | f2fs_put_dnode(&dn); |
248 | ||
650495de JK |
249 | if (dn.data_blkaddr == NULL_ADDR) { |
250 | f2fs_put_page(page, 1); | |
eb47b800 | 251 | return ERR_PTR(-ENOENT); |
650495de | 252 | } |
eb47b800 JK |
253 | |
254 | if (PageUptodate(page)) | |
255 | return page; | |
256 | ||
d59ff4df JK |
257 | /* |
258 | * A new dentry page is allocated but not able to be written, since its | |
259 | * new inode page couldn't be allocated due to -ENOSPC. | |
260 | * In such the case, its blkaddr can be remained as NEW_ADDR. | |
261 | * see, f2fs_add_link -> get_new_data_page -> init_inode_metadata. | |
262 | */ | |
263 | if (dn.data_blkaddr == NEW_ADDR) { | |
264 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
265 | SetPageUptodate(page); | |
266 | return page; | |
267 | } | |
eb47b800 JK |
268 | |
269 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
393ff91f | 270 | if (err) |
eb47b800 | 271 | return ERR_PTR(err); |
393ff91f JK |
272 | |
273 | lock_page(page); | |
274 | if (!PageUptodate(page)) { | |
275 | f2fs_put_page(page, 1); | |
276 | return ERR_PTR(-EIO); | |
eb47b800 | 277 | } |
afcb7ca0 JK |
278 | if (page->mapping != mapping) { |
279 | f2fs_put_page(page, 1); | |
280 | goto repeat; | |
eb47b800 JK |
281 | } |
282 | return page; | |
283 | } | |
284 | ||
0a8165d7 | 285 | /* |
eb47b800 JK |
286 | * Caller ensures that this data page is never allocated. |
287 | * A new zero-filled data page is allocated in the page cache. | |
39936837 JK |
288 | * |
289 | * Also, caller should grab and release a mutex by calling mutex_lock_op() and | |
290 | * mutex_unlock_op(). | |
44a83ff6 | 291 | * Note that, npage is set only by make_empty_dir. |
eb47b800 | 292 | */ |
64aa7ed9 JK |
293 | struct page *get_new_data_page(struct inode *inode, |
294 | struct page *npage, pgoff_t index, bool new_i_size) | |
eb47b800 JK |
295 | { |
296 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
297 | struct address_space *mapping = inode->i_mapping; | |
298 | struct page *page; | |
299 | struct dnode_of_data dn; | |
300 | int err; | |
301 | ||
64aa7ed9 | 302 | set_new_dnode(&dn, inode, npage, npage, 0); |
266e97a8 | 303 | err = get_dnode_of_data(&dn, index, ALLOC_NODE); |
eb47b800 JK |
304 | if (err) |
305 | return ERR_PTR(err); | |
306 | ||
307 | if (dn.data_blkaddr == NULL_ADDR) { | |
308 | if (reserve_new_block(&dn)) { | |
64aa7ed9 JK |
309 | if (!npage) |
310 | f2fs_put_dnode(&dn); | |
eb47b800 JK |
311 | return ERR_PTR(-ENOSPC); |
312 | } | |
313 | } | |
64aa7ed9 JK |
314 | if (!npage) |
315 | f2fs_put_dnode(&dn); | |
afcb7ca0 | 316 | repeat: |
eb47b800 JK |
317 | page = grab_cache_page(mapping, index); |
318 | if (!page) | |
319 | return ERR_PTR(-ENOMEM); | |
320 | ||
321 | if (PageUptodate(page)) | |
322 | return page; | |
323 | ||
324 | if (dn.data_blkaddr == NEW_ADDR) { | |
325 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
393ff91f | 326 | SetPageUptodate(page); |
eb47b800 JK |
327 | } else { |
328 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
393ff91f | 329 | if (err) |
eb47b800 | 330 | return ERR_PTR(err); |
393ff91f JK |
331 | lock_page(page); |
332 | if (!PageUptodate(page)) { | |
333 | f2fs_put_page(page, 1); | |
334 | return ERR_PTR(-EIO); | |
eb47b800 | 335 | } |
afcb7ca0 JK |
336 | if (page->mapping != mapping) { |
337 | f2fs_put_page(page, 1); | |
338 | goto repeat; | |
eb47b800 JK |
339 | } |
340 | } | |
eb47b800 JK |
341 | |
342 | if (new_i_size && | |
343 | i_size_read(inode) < ((index + 1) << PAGE_CACHE_SHIFT)) { | |
344 | i_size_write(inode, ((index + 1) << PAGE_CACHE_SHIFT)); | |
699489bb JK |
345 | /* Only the directory inode sets new_i_size */ |
346 | set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR); | |
eb47b800 JK |
347 | mark_inode_dirty_sync(inode); |
348 | } | |
349 | return page; | |
350 | } | |
351 | ||
352 | static void read_end_io(struct bio *bio, int err) | |
353 | { | |
354 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
355 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | |
356 | ||
357 | do { | |
358 | struct page *page = bvec->bv_page; | |
359 | ||
360 | if (--bvec >= bio->bi_io_vec) | |
361 | prefetchw(&bvec->bv_page->flags); | |
362 | ||
363 | if (uptodate) { | |
364 | SetPageUptodate(page); | |
365 | } else { | |
366 | ClearPageUptodate(page); | |
367 | SetPageError(page); | |
368 | } | |
369 | unlock_page(page); | |
370 | } while (bvec >= bio->bi_io_vec); | |
eb47b800 JK |
371 | bio_put(bio); |
372 | } | |
373 | ||
0a8165d7 | 374 | /* |
eb47b800 | 375 | * Fill the locked page with data located in the block address. |
393ff91f | 376 | * Return unlocked page. |
eb47b800 JK |
377 | */ |
378 | int f2fs_readpage(struct f2fs_sb_info *sbi, struct page *page, | |
379 | block_t blk_addr, int type) | |
380 | { | |
381 | struct block_device *bdev = sbi->sb->s_bdev; | |
eb47b800 JK |
382 | struct bio *bio; |
383 | ||
848753aa | 384 | trace_f2fs_readpage(page, blk_addr, type); |
eb47b800 JK |
385 | |
386 | down_read(&sbi->bio_sem); | |
387 | ||
388 | /* Allocate a new bio */ | |
3cd8a239 | 389 | bio = f2fs_bio_alloc(bdev, 1); |
eb47b800 JK |
390 | |
391 | /* Initialize the bio */ | |
3cd8a239 | 392 | bio->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr); |
eb47b800 | 393 | bio->bi_end_io = read_end_io; |
3cd8a239 | 394 | |
eb47b800 | 395 | if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) { |
eb47b800 JK |
396 | bio_put(bio); |
397 | up_read(&sbi->bio_sem); | |
393ff91f | 398 | f2fs_put_page(page, 1); |
eb47b800 JK |
399 | return -EFAULT; |
400 | } | |
401 | ||
402 | submit_bio(type, bio); | |
403 | up_read(&sbi->bio_sem); | |
eb47b800 JK |
404 | return 0; |
405 | } | |
406 | ||
0a8165d7 | 407 | /* |
eb47b800 JK |
408 | * This function should be used by the data read flow only where it |
409 | * does not check the "create" flag that indicates block allocation. | |
410 | * The reason for this special functionality is to exploit VFS readahead | |
411 | * mechanism. | |
412 | */ | |
413 | static int get_data_block_ro(struct inode *inode, sector_t iblock, | |
414 | struct buffer_head *bh_result, int create) | |
415 | { | |
416 | unsigned int blkbits = inode->i_sb->s_blocksize_bits; | |
417 | unsigned maxblocks = bh_result->b_size >> blkbits; | |
418 | struct dnode_of_data dn; | |
419 | pgoff_t pgofs; | |
420 | int err; | |
421 | ||
422 | /* Get the page offset from the block offset(iblock) */ | |
423 | pgofs = (pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits)); | |
424 | ||
848753aa NJ |
425 | if (check_extent_cache(inode, pgofs, bh_result)) { |
426 | trace_f2fs_get_data_block(inode, iblock, bh_result, 0); | |
eb47b800 | 427 | return 0; |
848753aa | 428 | } |
eb47b800 JK |
429 | |
430 | /* When reading holes, we need its node page */ | |
431 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 432 | err = get_dnode_of_data(&dn, pgofs, LOOKUP_NODE_RA); |
848753aa NJ |
433 | if (err) { |
434 | trace_f2fs_get_data_block(inode, iblock, bh_result, err); | |
eb47b800 | 435 | return (err == -ENOENT) ? 0 : err; |
848753aa | 436 | } |
eb47b800 JK |
437 | |
438 | /* It does not support data allocation */ | |
5d56b671 | 439 | f2fs_bug_on(create); |
eb47b800 JK |
440 | |
441 | if (dn.data_blkaddr != NEW_ADDR && dn.data_blkaddr != NULL_ADDR) { | |
442 | int i; | |
443 | unsigned int end_offset; | |
444 | ||
445 | end_offset = IS_INODE(dn.node_page) ? | |
de93653f | 446 | ADDRS_PER_INODE(F2FS_I(inode)) : |
eb47b800 JK |
447 | ADDRS_PER_BLOCK; |
448 | ||
449 | clear_buffer_new(bh_result); | |
450 | ||
451 | /* Give more consecutive addresses for the read ahead */ | |
452 | for (i = 0; i < end_offset - dn.ofs_in_node; i++) | |
453 | if (((datablock_addr(dn.node_page, | |
454 | dn.ofs_in_node + i)) | |
455 | != (dn.data_blkaddr + i)) || maxblocks == i) | |
456 | break; | |
457 | map_bh(bh_result, inode->i_sb, dn.data_blkaddr); | |
458 | bh_result->b_size = (i << blkbits); | |
459 | } | |
460 | f2fs_put_dnode(&dn); | |
848753aa | 461 | trace_f2fs_get_data_block(inode, iblock, bh_result, 0); |
eb47b800 JK |
462 | return 0; |
463 | } | |
464 | ||
465 | static int f2fs_read_data_page(struct file *file, struct page *page) | |
466 | { | |
467 | return mpage_readpage(page, get_data_block_ro); | |
468 | } | |
469 | ||
470 | static int f2fs_read_data_pages(struct file *file, | |
471 | struct address_space *mapping, | |
472 | struct list_head *pages, unsigned nr_pages) | |
473 | { | |
474 | return mpage_readpages(mapping, pages, nr_pages, get_data_block_ro); | |
475 | } | |
476 | ||
477 | int do_write_data_page(struct page *page) | |
478 | { | |
479 | struct inode *inode = page->mapping->host; | |
eb47b800 JK |
480 | block_t old_blk_addr, new_blk_addr; |
481 | struct dnode_of_data dn; | |
482 | int err = 0; | |
483 | ||
484 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 485 | err = get_dnode_of_data(&dn, page->index, LOOKUP_NODE); |
eb47b800 JK |
486 | if (err) |
487 | return err; | |
488 | ||
489 | old_blk_addr = dn.data_blkaddr; | |
490 | ||
491 | /* This page is already truncated */ | |
492 | if (old_blk_addr == NULL_ADDR) | |
493 | goto out_writepage; | |
494 | ||
495 | set_page_writeback(page); | |
496 | ||
497 | /* | |
498 | * If current allocation needs SSR, | |
499 | * it had better in-place writes for updated data. | |
500 | */ | |
b25958b6 HL |
501 | if (unlikely(old_blk_addr != NEW_ADDR && |
502 | !is_cold_data(page) && | |
503 | need_inplace_update(inode))) { | |
eb47b800 JK |
504 | rewrite_data_page(F2FS_SB(inode->i_sb), page, |
505 | old_blk_addr); | |
506 | } else { | |
507 | write_data_page(inode, page, &dn, | |
508 | old_blk_addr, &new_blk_addr); | |
509 | update_extent_cache(new_blk_addr, &dn); | |
eb47b800 JK |
510 | } |
511 | out_writepage: | |
512 | f2fs_put_dnode(&dn); | |
513 | return err; | |
514 | } | |
515 | ||
516 | static int f2fs_write_data_page(struct page *page, | |
517 | struct writeback_control *wbc) | |
518 | { | |
519 | struct inode *inode = page->mapping->host; | |
520 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
521 | loff_t i_size = i_size_read(inode); | |
522 | const pgoff_t end_index = ((unsigned long long) i_size) | |
523 | >> PAGE_CACHE_SHIFT; | |
524 | unsigned offset; | |
39936837 | 525 | bool need_balance_fs = false; |
eb47b800 JK |
526 | int err = 0; |
527 | ||
528 | if (page->index < end_index) | |
39936837 | 529 | goto write; |
eb47b800 JK |
530 | |
531 | /* | |
532 | * If the offset is out-of-range of file size, | |
533 | * this page does not have to be written to disk. | |
534 | */ | |
535 | offset = i_size & (PAGE_CACHE_SIZE - 1); | |
536 | if ((page->index >= end_index + 1) || !offset) { | |
537 | if (S_ISDIR(inode->i_mode)) { | |
538 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
539 | inode_dec_dirty_dents(inode); | |
540 | } | |
39936837 | 541 | goto out; |
eb47b800 JK |
542 | } |
543 | ||
544 | zero_user_segment(page, offset, PAGE_CACHE_SIZE); | |
39936837 JK |
545 | write: |
546 | if (sbi->por_doing) { | |
547 | err = AOP_WRITEPAGE_ACTIVATE; | |
eb47b800 | 548 | goto redirty_out; |
39936837 | 549 | } |
eb47b800 | 550 | |
39936837 | 551 | /* Dentry blocks are controlled by checkpoint */ |
eb47b800 JK |
552 | if (S_ISDIR(inode->i_mode)) { |
553 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
554 | inode_dec_dirty_dents(inode); | |
39936837 JK |
555 | err = do_write_data_page(page); |
556 | } else { | |
e479556b | 557 | f2fs_lock_op(sbi); |
39936837 | 558 | err = do_write_data_page(page); |
e479556b | 559 | f2fs_unlock_op(sbi); |
39936837 | 560 | need_balance_fs = true; |
eb47b800 | 561 | } |
39936837 JK |
562 | if (err == -ENOENT) |
563 | goto out; | |
564 | else if (err) | |
565 | goto redirty_out; | |
eb47b800 JK |
566 | |
567 | if (wbc->for_reclaim) | |
568 | f2fs_submit_bio(sbi, DATA, true); | |
569 | ||
eb47b800 | 570 | clear_cold_data(page); |
39936837 | 571 | out: |
eb47b800 | 572 | unlock_page(page); |
39936837 | 573 | if (need_balance_fs) |
eb47b800 JK |
574 | f2fs_balance_fs(sbi); |
575 | return 0; | |
576 | ||
eb47b800 JK |
577 | redirty_out: |
578 | wbc->pages_skipped++; | |
579 | set_page_dirty(page); | |
39936837 | 580 | return err; |
eb47b800 JK |
581 | } |
582 | ||
583 | #define MAX_DESIRED_PAGES_WP 4096 | |
584 | ||
fa9150a8 NJ |
585 | static int __f2fs_writepage(struct page *page, struct writeback_control *wbc, |
586 | void *data) | |
587 | { | |
588 | struct address_space *mapping = data; | |
589 | int ret = mapping->a_ops->writepage(page, wbc); | |
590 | mapping_set_error(mapping, ret); | |
591 | return ret; | |
592 | } | |
593 | ||
25ca923b | 594 | static int f2fs_write_data_pages(struct address_space *mapping, |
eb47b800 JK |
595 | struct writeback_control *wbc) |
596 | { | |
597 | struct inode *inode = mapping->host; | |
598 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
531ad7d5 | 599 | bool locked = false; |
eb47b800 JK |
600 | int ret; |
601 | long excess_nrtw = 0, desired_nrtw; | |
602 | ||
cfb185a1 | 603 | /* deal with chardevs and other special file */ |
604 | if (!mapping->a_ops->writepage) | |
605 | return 0; | |
606 | ||
eb47b800 JK |
607 | if (wbc->nr_to_write < MAX_DESIRED_PAGES_WP) { |
608 | desired_nrtw = MAX_DESIRED_PAGES_WP; | |
609 | excess_nrtw = desired_nrtw - wbc->nr_to_write; | |
610 | wbc->nr_to_write = desired_nrtw; | |
611 | } | |
612 | ||
531ad7d5 | 613 | if (!S_ISDIR(inode->i_mode)) { |
eb47b800 | 614 | mutex_lock(&sbi->writepages); |
531ad7d5 JK |
615 | locked = true; |
616 | } | |
fa9150a8 | 617 | ret = write_cache_pages(mapping, wbc, __f2fs_writepage, mapping); |
531ad7d5 | 618 | if (locked) |
eb47b800 JK |
619 | mutex_unlock(&sbi->writepages); |
620 | f2fs_submit_bio(sbi, DATA, (wbc->sync_mode == WB_SYNC_ALL)); | |
621 | ||
622 | remove_dirty_dir_inode(inode); | |
623 | ||
624 | wbc->nr_to_write -= excess_nrtw; | |
625 | return ret; | |
626 | } | |
627 | ||
628 | static int f2fs_write_begin(struct file *file, struct address_space *mapping, | |
629 | loff_t pos, unsigned len, unsigned flags, | |
630 | struct page **pagep, void **fsdata) | |
631 | { | |
632 | struct inode *inode = mapping->host; | |
633 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
634 | struct page *page; | |
635 | pgoff_t index = ((unsigned long long) pos) >> PAGE_CACHE_SHIFT; | |
636 | struct dnode_of_data dn; | |
637 | int err = 0; | |
638 | ||
eb47b800 | 639 | f2fs_balance_fs(sbi); |
afcb7ca0 | 640 | repeat: |
eb47b800 JK |
641 | page = grab_cache_page_write_begin(mapping, index, flags); |
642 | if (!page) | |
643 | return -ENOMEM; | |
644 | *pagep = page; | |
645 | ||
e479556b | 646 | f2fs_lock_op(sbi); |
eb47b800 JK |
647 | |
648 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 649 | err = get_dnode_of_data(&dn, index, ALLOC_NODE); |
39936837 JK |
650 | if (err) |
651 | goto err; | |
eb47b800 | 652 | |
39936837 | 653 | if (dn.data_blkaddr == NULL_ADDR) |
eb47b800 | 654 | err = reserve_new_block(&dn); |
39936837 | 655 | |
eb47b800 | 656 | f2fs_put_dnode(&dn); |
39936837 JK |
657 | if (err) |
658 | goto err; | |
eb47b800 | 659 | |
e479556b | 660 | f2fs_unlock_op(sbi); |
eb47b800 JK |
661 | |
662 | if ((len == PAGE_CACHE_SIZE) || PageUptodate(page)) | |
663 | return 0; | |
664 | ||
665 | if ((pos & PAGE_CACHE_MASK) >= i_size_read(inode)) { | |
666 | unsigned start = pos & (PAGE_CACHE_SIZE - 1); | |
667 | unsigned end = start + len; | |
668 | ||
669 | /* Reading beyond i_size is simple: memset to zero */ | |
670 | zero_user_segments(page, 0, start, end, PAGE_CACHE_SIZE); | |
393ff91f | 671 | goto out; |
eb47b800 JK |
672 | } |
673 | ||
674 | if (dn.data_blkaddr == NEW_ADDR) { | |
675 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
676 | } else { | |
677 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
393ff91f | 678 | if (err) |
eb47b800 | 679 | return err; |
393ff91f JK |
680 | lock_page(page); |
681 | if (!PageUptodate(page)) { | |
682 | f2fs_put_page(page, 1); | |
683 | return -EIO; | |
eb47b800 | 684 | } |
afcb7ca0 JK |
685 | if (page->mapping != mapping) { |
686 | f2fs_put_page(page, 1); | |
687 | goto repeat; | |
eb47b800 JK |
688 | } |
689 | } | |
393ff91f | 690 | out: |
eb47b800 JK |
691 | SetPageUptodate(page); |
692 | clear_cold_data(page); | |
693 | return 0; | |
39936837 JK |
694 | |
695 | err: | |
e479556b | 696 | f2fs_unlock_op(sbi); |
39936837 JK |
697 | f2fs_put_page(page, 1); |
698 | return err; | |
eb47b800 JK |
699 | } |
700 | ||
a1dd3c13 JK |
701 | static int f2fs_write_end(struct file *file, |
702 | struct address_space *mapping, | |
703 | loff_t pos, unsigned len, unsigned copied, | |
704 | struct page *page, void *fsdata) | |
705 | { | |
706 | struct inode *inode = page->mapping->host; | |
707 | ||
708 | SetPageUptodate(page); | |
709 | set_page_dirty(page); | |
710 | ||
711 | if (pos + copied > i_size_read(inode)) { | |
712 | i_size_write(inode, pos + copied); | |
713 | mark_inode_dirty(inode); | |
714 | update_inode_page(inode); | |
715 | } | |
716 | ||
717 | unlock_page(page); | |
718 | page_cache_release(page); | |
719 | return copied; | |
720 | } | |
721 | ||
eb47b800 JK |
722 | static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb, |
723 | const struct iovec *iov, loff_t offset, unsigned long nr_segs) | |
724 | { | |
725 | struct file *file = iocb->ki_filp; | |
726 | struct inode *inode = file->f_mapping->host; | |
727 | ||
728 | if (rw == WRITE) | |
729 | return 0; | |
730 | ||
731 | /* Needs synchronization with the cleaner */ | |
732 | return blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs, | |
733 | get_data_block_ro); | |
734 | } | |
735 | ||
d47992f8 LC |
736 | static void f2fs_invalidate_data_page(struct page *page, unsigned int offset, |
737 | unsigned int length) | |
eb47b800 JK |
738 | { |
739 | struct inode *inode = page->mapping->host; | |
740 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
741 | if (S_ISDIR(inode->i_mode) && PageDirty(page)) { | |
742 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
743 | inode_dec_dirty_dents(inode); | |
744 | } | |
745 | ClearPagePrivate(page); | |
746 | } | |
747 | ||
748 | static int f2fs_release_data_page(struct page *page, gfp_t wait) | |
749 | { | |
750 | ClearPagePrivate(page); | |
c3850aa1 | 751 | return 1; |
eb47b800 JK |
752 | } |
753 | ||
754 | static int f2fs_set_data_page_dirty(struct page *page) | |
755 | { | |
756 | struct address_space *mapping = page->mapping; | |
757 | struct inode *inode = mapping->host; | |
758 | ||
26c6b887 JK |
759 | trace_f2fs_set_page_dirty(page, DATA); |
760 | ||
eb47b800 JK |
761 | SetPageUptodate(page); |
762 | if (!PageDirty(page)) { | |
763 | __set_page_dirty_nobuffers(page); | |
764 | set_dirty_dir_page(inode, page); | |
765 | return 1; | |
766 | } | |
767 | return 0; | |
768 | } | |
769 | ||
c01e54b7 JK |
770 | static sector_t f2fs_bmap(struct address_space *mapping, sector_t block) |
771 | { | |
772 | return generic_block_bmap(mapping, block, get_data_block_ro); | |
773 | } | |
774 | ||
eb47b800 JK |
775 | const struct address_space_operations f2fs_dblock_aops = { |
776 | .readpage = f2fs_read_data_page, | |
777 | .readpages = f2fs_read_data_pages, | |
778 | .writepage = f2fs_write_data_page, | |
779 | .writepages = f2fs_write_data_pages, | |
780 | .write_begin = f2fs_write_begin, | |
a1dd3c13 | 781 | .write_end = f2fs_write_end, |
eb47b800 JK |
782 | .set_page_dirty = f2fs_set_data_page_dirty, |
783 | .invalidatepage = f2fs_invalidate_data_page, | |
784 | .releasepage = f2fs_release_data_page, | |
785 | .direct_IO = f2fs_direct_IO, | |
c01e54b7 | 786 | .bmap = f2fs_bmap, |
eb47b800 | 787 | }; |