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 | ||
40 | wait_on_page_writeback(node_page); | |
41 | ||
42 | rn = (struct f2fs_node *)page_address(node_page); | |
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); | |
120 | fofs = start_bidx_of_node(ofs_of_node(dn->node_page)) + dn->ofs_in_node; | |
121 | ||
122 | /* Update the page address in the parent node */ | |
123 | __set_data_blkaddr(dn, blk_addr); | |
124 | ||
125 | write_lock(&fi->ext.ext_lock); | |
126 | ||
127 | start_fofs = fi->ext.fofs; | |
128 | end_fofs = fi->ext.fofs + fi->ext.len - 1; | |
129 | start_blkaddr = fi->ext.blk_addr; | |
130 | end_blkaddr = fi->ext.blk_addr + fi->ext.len - 1; | |
131 | ||
132 | /* Drop and initialize the matched extent */ | |
133 | if (fi->ext.len == 1 && fofs == start_fofs) | |
134 | fi->ext.len = 0; | |
135 | ||
136 | /* Initial extent */ | |
137 | if (fi->ext.len == 0) { | |
138 | if (blk_addr != NULL_ADDR) { | |
139 | fi->ext.fofs = fofs; | |
140 | fi->ext.blk_addr = blk_addr; | |
141 | fi->ext.len = 1; | |
142 | } | |
143 | goto end_update; | |
144 | } | |
145 | ||
6224da87 | 146 | /* Front merge */ |
eb47b800 JK |
147 | if (fofs == start_fofs - 1 && blk_addr == start_blkaddr - 1) { |
148 | fi->ext.fofs--; | |
149 | fi->ext.blk_addr--; | |
150 | fi->ext.len++; | |
151 | goto end_update; | |
152 | } | |
153 | ||
154 | /* Back merge */ | |
155 | if (fofs == end_fofs + 1 && blk_addr == end_blkaddr + 1) { | |
156 | fi->ext.len++; | |
157 | goto end_update; | |
158 | } | |
159 | ||
160 | /* Split the existing extent */ | |
161 | if (fi->ext.len > 1 && | |
162 | fofs >= start_fofs && fofs <= end_fofs) { | |
163 | if ((end_fofs - fofs) < (fi->ext.len >> 1)) { | |
164 | fi->ext.len = fofs - start_fofs; | |
165 | } else { | |
166 | fi->ext.fofs = fofs + 1; | |
167 | fi->ext.blk_addr = start_blkaddr + | |
168 | fofs - start_fofs + 1; | |
169 | fi->ext.len -= fofs - start_fofs + 1; | |
170 | } | |
171 | goto end_update; | |
172 | } | |
173 | write_unlock(&fi->ext.ext_lock); | |
174 | return; | |
175 | ||
176 | end_update: | |
177 | write_unlock(&fi->ext.ext_lock); | |
178 | sync_inode_page(dn); | |
179 | return; | |
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 | ||
263 | BUG_ON(dn.data_blkaddr == NEW_ADDR); | |
264 | BUG_ON(dn.data_blkaddr == NULL_ADDR); | |
265 | ||
266 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
393ff91f | 267 | if (err) |
eb47b800 | 268 | return ERR_PTR(err); |
393ff91f JK |
269 | |
270 | lock_page(page); | |
271 | if (!PageUptodate(page)) { | |
272 | f2fs_put_page(page, 1); | |
273 | return ERR_PTR(-EIO); | |
eb47b800 | 274 | } |
afcb7ca0 JK |
275 | if (page->mapping != mapping) { |
276 | f2fs_put_page(page, 1); | |
277 | goto repeat; | |
eb47b800 JK |
278 | } |
279 | return page; | |
280 | } | |
281 | ||
0a8165d7 | 282 | /* |
eb47b800 JK |
283 | * Caller ensures that this data page is never allocated. |
284 | * A new zero-filled data page is allocated in the page cache. | |
39936837 JK |
285 | * |
286 | * Also, caller should grab and release a mutex by calling mutex_lock_op() and | |
287 | * mutex_unlock_op(). | |
44a83ff6 | 288 | * Note that, npage is set only by make_empty_dir. |
eb47b800 | 289 | */ |
64aa7ed9 JK |
290 | struct page *get_new_data_page(struct inode *inode, |
291 | struct page *npage, pgoff_t index, bool new_i_size) | |
eb47b800 JK |
292 | { |
293 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
294 | struct address_space *mapping = inode->i_mapping; | |
295 | struct page *page; | |
296 | struct dnode_of_data dn; | |
297 | int err; | |
298 | ||
64aa7ed9 | 299 | set_new_dnode(&dn, inode, npage, npage, 0); |
266e97a8 | 300 | err = get_dnode_of_data(&dn, index, ALLOC_NODE); |
eb47b800 JK |
301 | if (err) |
302 | return ERR_PTR(err); | |
303 | ||
304 | if (dn.data_blkaddr == NULL_ADDR) { | |
305 | if (reserve_new_block(&dn)) { | |
64aa7ed9 JK |
306 | if (!npage) |
307 | f2fs_put_dnode(&dn); | |
eb47b800 JK |
308 | return ERR_PTR(-ENOSPC); |
309 | } | |
310 | } | |
64aa7ed9 JK |
311 | if (!npage) |
312 | f2fs_put_dnode(&dn); | |
afcb7ca0 | 313 | repeat: |
eb47b800 JK |
314 | page = grab_cache_page(mapping, index); |
315 | if (!page) | |
316 | return ERR_PTR(-ENOMEM); | |
317 | ||
318 | if (PageUptodate(page)) | |
319 | return page; | |
320 | ||
321 | if (dn.data_blkaddr == NEW_ADDR) { | |
322 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
393ff91f | 323 | SetPageUptodate(page); |
eb47b800 JK |
324 | } else { |
325 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
393ff91f | 326 | if (err) |
eb47b800 | 327 | return ERR_PTR(err); |
393ff91f JK |
328 | lock_page(page); |
329 | if (!PageUptodate(page)) { | |
330 | f2fs_put_page(page, 1); | |
331 | return ERR_PTR(-EIO); | |
eb47b800 | 332 | } |
afcb7ca0 JK |
333 | if (page->mapping != mapping) { |
334 | f2fs_put_page(page, 1); | |
335 | goto repeat; | |
eb47b800 JK |
336 | } |
337 | } | |
eb47b800 JK |
338 | |
339 | if (new_i_size && | |
340 | i_size_read(inode) < ((index + 1) << PAGE_CACHE_SHIFT)) { | |
341 | i_size_write(inode, ((index + 1) << PAGE_CACHE_SHIFT)); | |
342 | mark_inode_dirty_sync(inode); | |
343 | } | |
344 | return page; | |
345 | } | |
346 | ||
347 | static void read_end_io(struct bio *bio, int err) | |
348 | { | |
349 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
350 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | |
351 | ||
352 | do { | |
353 | struct page *page = bvec->bv_page; | |
354 | ||
355 | if (--bvec >= bio->bi_io_vec) | |
356 | prefetchw(&bvec->bv_page->flags); | |
357 | ||
358 | if (uptodate) { | |
359 | SetPageUptodate(page); | |
360 | } else { | |
361 | ClearPageUptodate(page); | |
362 | SetPageError(page); | |
363 | } | |
364 | unlock_page(page); | |
365 | } while (bvec >= bio->bi_io_vec); | |
366 | kfree(bio->bi_private); | |
367 | bio_put(bio); | |
368 | } | |
369 | ||
0a8165d7 | 370 | /* |
eb47b800 | 371 | * Fill the locked page with data located in the block address. |
393ff91f | 372 | * Return unlocked page. |
eb47b800 JK |
373 | */ |
374 | int f2fs_readpage(struct f2fs_sb_info *sbi, struct page *page, | |
375 | block_t blk_addr, int type) | |
376 | { | |
377 | struct block_device *bdev = sbi->sb->s_bdev; | |
eb47b800 JK |
378 | struct bio *bio; |
379 | ||
848753aa | 380 | trace_f2fs_readpage(page, blk_addr, type); |
eb47b800 JK |
381 | |
382 | down_read(&sbi->bio_sem); | |
383 | ||
384 | /* Allocate a new bio */ | |
3cd8a239 | 385 | bio = f2fs_bio_alloc(bdev, 1); |
eb47b800 JK |
386 | |
387 | /* Initialize the bio */ | |
3cd8a239 | 388 | bio->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr); |
eb47b800 | 389 | bio->bi_end_io = read_end_io; |
3cd8a239 | 390 | |
eb47b800 JK |
391 | if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) { |
392 | kfree(bio->bi_private); | |
393 | bio_put(bio); | |
394 | up_read(&sbi->bio_sem); | |
393ff91f | 395 | f2fs_put_page(page, 1); |
eb47b800 JK |
396 | return -EFAULT; |
397 | } | |
398 | ||
399 | submit_bio(type, bio); | |
400 | up_read(&sbi->bio_sem); | |
eb47b800 JK |
401 | return 0; |
402 | } | |
403 | ||
0a8165d7 | 404 | /* |
eb47b800 JK |
405 | * This function should be used by the data read flow only where it |
406 | * does not check the "create" flag that indicates block allocation. | |
407 | * The reason for this special functionality is to exploit VFS readahead | |
408 | * mechanism. | |
409 | */ | |
410 | static int get_data_block_ro(struct inode *inode, sector_t iblock, | |
411 | struct buffer_head *bh_result, int create) | |
412 | { | |
413 | unsigned int blkbits = inode->i_sb->s_blocksize_bits; | |
414 | unsigned maxblocks = bh_result->b_size >> blkbits; | |
415 | struct dnode_of_data dn; | |
416 | pgoff_t pgofs; | |
417 | int err; | |
418 | ||
419 | /* Get the page offset from the block offset(iblock) */ | |
420 | pgofs = (pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits)); | |
421 | ||
848753aa NJ |
422 | if (check_extent_cache(inode, pgofs, bh_result)) { |
423 | trace_f2fs_get_data_block(inode, iblock, bh_result, 0); | |
eb47b800 | 424 | return 0; |
848753aa | 425 | } |
eb47b800 JK |
426 | |
427 | /* When reading holes, we need its node page */ | |
428 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 429 | err = get_dnode_of_data(&dn, pgofs, LOOKUP_NODE_RA); |
848753aa NJ |
430 | if (err) { |
431 | trace_f2fs_get_data_block(inode, iblock, bh_result, err); | |
eb47b800 | 432 | return (err == -ENOENT) ? 0 : err; |
848753aa | 433 | } |
eb47b800 JK |
434 | |
435 | /* It does not support data allocation */ | |
436 | BUG_ON(create); | |
437 | ||
438 | if (dn.data_blkaddr != NEW_ADDR && dn.data_blkaddr != NULL_ADDR) { | |
439 | int i; | |
440 | unsigned int end_offset; | |
441 | ||
442 | end_offset = IS_INODE(dn.node_page) ? | |
443 | ADDRS_PER_INODE : | |
444 | ADDRS_PER_BLOCK; | |
445 | ||
446 | clear_buffer_new(bh_result); | |
447 | ||
448 | /* Give more consecutive addresses for the read ahead */ | |
449 | for (i = 0; i < end_offset - dn.ofs_in_node; i++) | |
450 | if (((datablock_addr(dn.node_page, | |
451 | dn.ofs_in_node + i)) | |
452 | != (dn.data_blkaddr + i)) || maxblocks == i) | |
453 | break; | |
454 | map_bh(bh_result, inode->i_sb, dn.data_blkaddr); | |
455 | bh_result->b_size = (i << blkbits); | |
456 | } | |
457 | f2fs_put_dnode(&dn); | |
848753aa | 458 | trace_f2fs_get_data_block(inode, iblock, bh_result, 0); |
eb47b800 JK |
459 | return 0; |
460 | } | |
461 | ||
462 | static int f2fs_read_data_page(struct file *file, struct page *page) | |
463 | { | |
464 | return mpage_readpage(page, get_data_block_ro); | |
465 | } | |
466 | ||
467 | static int f2fs_read_data_pages(struct file *file, | |
468 | struct address_space *mapping, | |
469 | struct list_head *pages, unsigned nr_pages) | |
470 | { | |
471 | return mpage_readpages(mapping, pages, nr_pages, get_data_block_ro); | |
472 | } | |
473 | ||
474 | int do_write_data_page(struct page *page) | |
475 | { | |
476 | struct inode *inode = page->mapping->host; | |
eb47b800 JK |
477 | block_t old_blk_addr, new_blk_addr; |
478 | struct dnode_of_data dn; | |
479 | int err = 0; | |
480 | ||
481 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 482 | err = get_dnode_of_data(&dn, page->index, LOOKUP_NODE); |
eb47b800 JK |
483 | if (err) |
484 | return err; | |
485 | ||
486 | old_blk_addr = dn.data_blkaddr; | |
487 | ||
488 | /* This page is already truncated */ | |
489 | if (old_blk_addr == NULL_ADDR) | |
490 | goto out_writepage; | |
491 | ||
492 | set_page_writeback(page); | |
493 | ||
494 | /* | |
495 | * If current allocation needs SSR, | |
496 | * it had better in-place writes for updated data. | |
497 | */ | |
498 | if (old_blk_addr != NEW_ADDR && !is_cold_data(page) && | |
499 | need_inplace_update(inode)) { | |
500 | rewrite_data_page(F2FS_SB(inode->i_sb), page, | |
501 | old_blk_addr); | |
502 | } else { | |
503 | write_data_page(inode, page, &dn, | |
504 | old_blk_addr, &new_blk_addr); | |
505 | update_extent_cache(new_blk_addr, &dn); | |
eb47b800 JK |
506 | } |
507 | out_writepage: | |
508 | f2fs_put_dnode(&dn); | |
509 | return err; | |
510 | } | |
511 | ||
512 | static int f2fs_write_data_page(struct page *page, | |
513 | struct writeback_control *wbc) | |
514 | { | |
515 | struct inode *inode = page->mapping->host; | |
516 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
517 | loff_t i_size = i_size_read(inode); | |
518 | const pgoff_t end_index = ((unsigned long long) i_size) | |
519 | >> PAGE_CACHE_SHIFT; | |
520 | unsigned offset; | |
39936837 | 521 | bool need_balance_fs = false; |
eb47b800 JK |
522 | int err = 0; |
523 | ||
524 | if (page->index < end_index) | |
39936837 | 525 | goto write; |
eb47b800 JK |
526 | |
527 | /* | |
528 | * If the offset is out-of-range of file size, | |
529 | * this page does not have to be written to disk. | |
530 | */ | |
531 | offset = i_size & (PAGE_CACHE_SIZE - 1); | |
532 | if ((page->index >= end_index + 1) || !offset) { | |
533 | if (S_ISDIR(inode->i_mode)) { | |
534 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
535 | inode_dec_dirty_dents(inode); | |
536 | } | |
39936837 | 537 | goto out; |
eb47b800 JK |
538 | } |
539 | ||
540 | zero_user_segment(page, offset, PAGE_CACHE_SIZE); | |
39936837 JK |
541 | write: |
542 | if (sbi->por_doing) { | |
543 | err = AOP_WRITEPAGE_ACTIVATE; | |
eb47b800 | 544 | goto redirty_out; |
39936837 | 545 | } |
eb47b800 | 546 | |
39936837 | 547 | /* Dentry blocks are controlled by checkpoint */ |
eb47b800 JK |
548 | if (S_ISDIR(inode->i_mode)) { |
549 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
550 | inode_dec_dirty_dents(inode); | |
39936837 JK |
551 | err = do_write_data_page(page); |
552 | } else { | |
553 | int ilock = mutex_lock_op(sbi); | |
554 | err = do_write_data_page(page); | |
555 | mutex_unlock_op(sbi, ilock); | |
556 | need_balance_fs = true; | |
eb47b800 | 557 | } |
39936837 JK |
558 | if (err == -ENOENT) |
559 | goto out; | |
560 | else if (err) | |
561 | goto redirty_out; | |
eb47b800 JK |
562 | |
563 | if (wbc->for_reclaim) | |
564 | f2fs_submit_bio(sbi, DATA, true); | |
565 | ||
eb47b800 | 566 | clear_cold_data(page); |
39936837 | 567 | out: |
eb47b800 | 568 | unlock_page(page); |
39936837 | 569 | if (need_balance_fs) |
eb47b800 JK |
570 | f2fs_balance_fs(sbi); |
571 | return 0; | |
572 | ||
eb47b800 JK |
573 | redirty_out: |
574 | wbc->pages_skipped++; | |
575 | set_page_dirty(page); | |
39936837 | 576 | return err; |
eb47b800 JK |
577 | } |
578 | ||
579 | #define MAX_DESIRED_PAGES_WP 4096 | |
580 | ||
fa9150a8 NJ |
581 | static int __f2fs_writepage(struct page *page, struct writeback_control *wbc, |
582 | void *data) | |
583 | { | |
584 | struct address_space *mapping = data; | |
585 | int ret = mapping->a_ops->writepage(page, wbc); | |
586 | mapping_set_error(mapping, ret); | |
587 | return ret; | |
588 | } | |
589 | ||
25ca923b | 590 | static int f2fs_write_data_pages(struct address_space *mapping, |
eb47b800 JK |
591 | struct writeback_control *wbc) |
592 | { | |
593 | struct inode *inode = mapping->host; | |
594 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
531ad7d5 | 595 | bool locked = false; |
eb47b800 JK |
596 | int ret; |
597 | long excess_nrtw = 0, desired_nrtw; | |
598 | ||
cfb185a1 | 599 | /* deal with chardevs and other special file */ |
600 | if (!mapping->a_ops->writepage) | |
601 | return 0; | |
602 | ||
eb47b800 JK |
603 | if (wbc->nr_to_write < MAX_DESIRED_PAGES_WP) { |
604 | desired_nrtw = MAX_DESIRED_PAGES_WP; | |
605 | excess_nrtw = desired_nrtw - wbc->nr_to_write; | |
606 | wbc->nr_to_write = desired_nrtw; | |
607 | } | |
608 | ||
531ad7d5 | 609 | if (!S_ISDIR(inode->i_mode)) { |
eb47b800 | 610 | mutex_lock(&sbi->writepages); |
531ad7d5 JK |
611 | locked = true; |
612 | } | |
fa9150a8 | 613 | ret = write_cache_pages(mapping, wbc, __f2fs_writepage, mapping); |
531ad7d5 | 614 | if (locked) |
eb47b800 JK |
615 | mutex_unlock(&sbi->writepages); |
616 | f2fs_submit_bio(sbi, DATA, (wbc->sync_mode == WB_SYNC_ALL)); | |
617 | ||
618 | remove_dirty_dir_inode(inode); | |
619 | ||
620 | wbc->nr_to_write -= excess_nrtw; | |
621 | return ret; | |
622 | } | |
623 | ||
624 | static int f2fs_write_begin(struct file *file, struct address_space *mapping, | |
625 | loff_t pos, unsigned len, unsigned flags, | |
626 | struct page **pagep, void **fsdata) | |
627 | { | |
628 | struct inode *inode = mapping->host; | |
629 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
630 | struct page *page; | |
631 | pgoff_t index = ((unsigned long long) pos) >> PAGE_CACHE_SHIFT; | |
632 | struct dnode_of_data dn; | |
633 | int err = 0; | |
39936837 | 634 | int ilock; |
eb47b800 JK |
635 | |
636 | /* for nobh_write_end */ | |
637 | *fsdata = NULL; | |
638 | ||
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 | ||
39936837 | 646 | ilock = mutex_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 | |
39936837 | 660 | mutex_unlock_op(sbi, ilock); |
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: | |
696 | mutex_unlock_op(sbi, ilock); | |
697 | f2fs_put_page(page, 1); | |
698 | return err; | |
eb47b800 JK |
699 | } |
700 | ||
701 | static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb, | |
702 | const struct iovec *iov, loff_t offset, unsigned long nr_segs) | |
703 | { | |
704 | struct file *file = iocb->ki_filp; | |
705 | struct inode *inode = file->f_mapping->host; | |
706 | ||
707 | if (rw == WRITE) | |
708 | return 0; | |
709 | ||
710 | /* Needs synchronization with the cleaner */ | |
711 | return blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs, | |
712 | get_data_block_ro); | |
713 | } | |
714 | ||
715 | static void f2fs_invalidate_data_page(struct page *page, unsigned long offset) | |
716 | { | |
717 | struct inode *inode = page->mapping->host; | |
718 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
719 | if (S_ISDIR(inode->i_mode) && PageDirty(page)) { | |
720 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
721 | inode_dec_dirty_dents(inode); | |
722 | } | |
723 | ClearPagePrivate(page); | |
724 | } | |
725 | ||
726 | static int f2fs_release_data_page(struct page *page, gfp_t wait) | |
727 | { | |
728 | ClearPagePrivate(page); | |
c3850aa1 | 729 | return 1; |
eb47b800 JK |
730 | } |
731 | ||
732 | static int f2fs_set_data_page_dirty(struct page *page) | |
733 | { | |
734 | struct address_space *mapping = page->mapping; | |
735 | struct inode *inode = mapping->host; | |
736 | ||
737 | SetPageUptodate(page); | |
738 | if (!PageDirty(page)) { | |
739 | __set_page_dirty_nobuffers(page); | |
740 | set_dirty_dir_page(inode, page); | |
741 | return 1; | |
742 | } | |
743 | return 0; | |
744 | } | |
745 | ||
c01e54b7 JK |
746 | static sector_t f2fs_bmap(struct address_space *mapping, sector_t block) |
747 | { | |
748 | return generic_block_bmap(mapping, block, get_data_block_ro); | |
749 | } | |
750 | ||
eb47b800 JK |
751 | const struct address_space_operations f2fs_dblock_aops = { |
752 | .readpage = f2fs_read_data_page, | |
753 | .readpages = f2fs_read_data_pages, | |
754 | .writepage = f2fs_write_data_page, | |
755 | .writepages = f2fs_write_data_pages, | |
756 | .write_begin = f2fs_write_begin, | |
757 | .write_end = nobh_write_end, | |
758 | .set_page_dirty = f2fs_set_data_page_dirty, | |
759 | .invalidatepage = f2fs_invalidate_data_page, | |
760 | .releasepage = f2fs_release_data_page, | |
761 | .direct_IO = f2fs_direct_IO, | |
c01e54b7 | 762 | .bmap = f2fs_bmap, |
eb47b800 | 763 | }; |