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); | |
71 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
72 | pgoff_t start_fofs, end_fofs; | |
73 | block_t start_blkaddr; | |
74 | ||
75 | read_lock(&fi->ext.ext_lock); | |
76 | if (fi->ext.len == 0) { | |
77 | read_unlock(&fi->ext.ext_lock); | |
78 | return 0; | |
79 | } | |
80 | ||
81 | sbi->total_hit_ext++; | |
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 | ||
99 | sbi->read_hit_ext++; | |
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 | ||
113 | BUG_ON(blk_addr == NEW_ADDR); | |
114 | fofs = start_bidx_of_node(ofs_of_node(dn->node_page)) + dn->ofs_in_node; | |
115 | ||
116 | /* Update the page address in the parent node */ | |
117 | __set_data_blkaddr(dn, blk_addr); | |
118 | ||
119 | write_lock(&fi->ext.ext_lock); | |
120 | ||
121 | start_fofs = fi->ext.fofs; | |
122 | end_fofs = fi->ext.fofs + fi->ext.len - 1; | |
123 | start_blkaddr = fi->ext.blk_addr; | |
124 | end_blkaddr = fi->ext.blk_addr + fi->ext.len - 1; | |
125 | ||
126 | /* Drop and initialize the matched extent */ | |
127 | if (fi->ext.len == 1 && fofs == start_fofs) | |
128 | fi->ext.len = 0; | |
129 | ||
130 | /* Initial extent */ | |
131 | if (fi->ext.len == 0) { | |
132 | if (blk_addr != NULL_ADDR) { | |
133 | fi->ext.fofs = fofs; | |
134 | fi->ext.blk_addr = blk_addr; | |
135 | fi->ext.len = 1; | |
136 | } | |
137 | goto end_update; | |
138 | } | |
139 | ||
6224da87 | 140 | /* Front merge */ |
eb47b800 JK |
141 | if (fofs == start_fofs - 1 && blk_addr == start_blkaddr - 1) { |
142 | fi->ext.fofs--; | |
143 | fi->ext.blk_addr--; | |
144 | fi->ext.len++; | |
145 | goto end_update; | |
146 | } | |
147 | ||
148 | /* Back merge */ | |
149 | if (fofs == end_fofs + 1 && blk_addr == end_blkaddr + 1) { | |
150 | fi->ext.len++; | |
151 | goto end_update; | |
152 | } | |
153 | ||
154 | /* Split the existing extent */ | |
155 | if (fi->ext.len > 1 && | |
156 | fofs >= start_fofs && fofs <= end_fofs) { | |
157 | if ((end_fofs - fofs) < (fi->ext.len >> 1)) { | |
158 | fi->ext.len = fofs - start_fofs; | |
159 | } else { | |
160 | fi->ext.fofs = fofs + 1; | |
161 | fi->ext.blk_addr = start_blkaddr + | |
162 | fofs - start_fofs + 1; | |
163 | fi->ext.len -= fofs - start_fofs + 1; | |
164 | } | |
165 | goto end_update; | |
166 | } | |
167 | write_unlock(&fi->ext.ext_lock); | |
168 | return; | |
169 | ||
170 | end_update: | |
171 | write_unlock(&fi->ext.ext_lock); | |
172 | sync_inode_page(dn); | |
173 | return; | |
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 | ||
202 | page = grab_cache_page(mapping, index); | |
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 JK |
236 | repeat: |
237 | page = grab_cache_page(mapping, index); | |
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 | ||
257 | BUG_ON(dn.data_blkaddr == NEW_ADDR); | |
258 | BUG_ON(dn.data_blkaddr == NULL_ADDR); | |
259 | ||
260 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
393ff91f | 261 | if (err) |
eb47b800 | 262 | return ERR_PTR(err); |
393ff91f JK |
263 | |
264 | lock_page(page); | |
265 | if (!PageUptodate(page)) { | |
266 | f2fs_put_page(page, 1); | |
267 | return ERR_PTR(-EIO); | |
eb47b800 | 268 | } |
afcb7ca0 JK |
269 | if (page->mapping != mapping) { |
270 | f2fs_put_page(page, 1); | |
271 | goto repeat; | |
eb47b800 JK |
272 | } |
273 | return page; | |
274 | } | |
275 | ||
0a8165d7 | 276 | /* |
eb47b800 JK |
277 | * Caller ensures that this data page is never allocated. |
278 | * A new zero-filled data page is allocated in the page cache. | |
39936837 JK |
279 | * |
280 | * Also, caller should grab and release a mutex by calling mutex_lock_op() and | |
281 | * mutex_unlock_op(). | |
44a83ff6 | 282 | * Note that, npage is set only by make_empty_dir. |
eb47b800 | 283 | */ |
64aa7ed9 JK |
284 | struct page *get_new_data_page(struct inode *inode, |
285 | struct page *npage, pgoff_t index, bool new_i_size) | |
eb47b800 JK |
286 | { |
287 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
288 | struct address_space *mapping = inode->i_mapping; | |
289 | struct page *page; | |
290 | struct dnode_of_data dn; | |
291 | int err; | |
292 | ||
64aa7ed9 | 293 | set_new_dnode(&dn, inode, npage, npage, 0); |
266e97a8 | 294 | err = get_dnode_of_data(&dn, index, ALLOC_NODE); |
eb47b800 JK |
295 | if (err) |
296 | return ERR_PTR(err); | |
297 | ||
298 | if (dn.data_blkaddr == NULL_ADDR) { | |
299 | if (reserve_new_block(&dn)) { | |
64aa7ed9 JK |
300 | if (!npage) |
301 | f2fs_put_dnode(&dn); | |
eb47b800 JK |
302 | return ERR_PTR(-ENOSPC); |
303 | } | |
304 | } | |
64aa7ed9 JK |
305 | if (!npage) |
306 | f2fs_put_dnode(&dn); | |
afcb7ca0 | 307 | repeat: |
eb47b800 JK |
308 | page = grab_cache_page(mapping, index); |
309 | if (!page) | |
310 | return ERR_PTR(-ENOMEM); | |
311 | ||
312 | if (PageUptodate(page)) | |
313 | return page; | |
314 | ||
315 | if (dn.data_blkaddr == NEW_ADDR) { | |
316 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
393ff91f | 317 | SetPageUptodate(page); |
eb47b800 JK |
318 | } else { |
319 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
393ff91f | 320 | if (err) |
eb47b800 | 321 | return ERR_PTR(err); |
393ff91f JK |
322 | lock_page(page); |
323 | if (!PageUptodate(page)) { | |
324 | f2fs_put_page(page, 1); | |
325 | return ERR_PTR(-EIO); | |
eb47b800 | 326 | } |
afcb7ca0 JK |
327 | if (page->mapping != mapping) { |
328 | f2fs_put_page(page, 1); | |
329 | goto repeat; | |
eb47b800 JK |
330 | } |
331 | } | |
eb47b800 JK |
332 | |
333 | if (new_i_size && | |
334 | i_size_read(inode) < ((index + 1) << PAGE_CACHE_SHIFT)) { | |
335 | i_size_write(inode, ((index + 1) << PAGE_CACHE_SHIFT)); | |
336 | mark_inode_dirty_sync(inode); | |
337 | } | |
338 | return page; | |
339 | } | |
340 | ||
341 | static void read_end_io(struct bio *bio, int err) | |
342 | { | |
343 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
344 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | |
345 | ||
346 | do { | |
347 | struct page *page = bvec->bv_page; | |
348 | ||
349 | if (--bvec >= bio->bi_io_vec) | |
350 | prefetchw(&bvec->bv_page->flags); | |
351 | ||
352 | if (uptodate) { | |
353 | SetPageUptodate(page); | |
354 | } else { | |
355 | ClearPageUptodate(page); | |
356 | SetPageError(page); | |
357 | } | |
358 | unlock_page(page); | |
359 | } while (bvec >= bio->bi_io_vec); | |
360 | kfree(bio->bi_private); | |
361 | bio_put(bio); | |
362 | } | |
363 | ||
0a8165d7 | 364 | /* |
eb47b800 | 365 | * Fill the locked page with data located in the block address. |
393ff91f | 366 | * Return unlocked page. |
eb47b800 JK |
367 | */ |
368 | int f2fs_readpage(struct f2fs_sb_info *sbi, struct page *page, | |
369 | block_t blk_addr, int type) | |
370 | { | |
371 | struct block_device *bdev = sbi->sb->s_bdev; | |
eb47b800 JK |
372 | struct bio *bio; |
373 | ||
848753aa | 374 | trace_f2fs_readpage(page, blk_addr, type); |
eb47b800 JK |
375 | |
376 | down_read(&sbi->bio_sem); | |
377 | ||
378 | /* Allocate a new bio */ | |
3cd8a239 | 379 | bio = f2fs_bio_alloc(bdev, 1); |
eb47b800 JK |
380 | |
381 | /* Initialize the bio */ | |
3cd8a239 | 382 | bio->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr); |
eb47b800 | 383 | bio->bi_end_io = read_end_io; |
3cd8a239 | 384 | |
eb47b800 JK |
385 | if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) { |
386 | kfree(bio->bi_private); | |
387 | bio_put(bio); | |
388 | up_read(&sbi->bio_sem); | |
393ff91f | 389 | f2fs_put_page(page, 1); |
eb47b800 JK |
390 | return -EFAULT; |
391 | } | |
392 | ||
393 | submit_bio(type, bio); | |
394 | up_read(&sbi->bio_sem); | |
eb47b800 JK |
395 | return 0; |
396 | } | |
397 | ||
0a8165d7 | 398 | /* |
eb47b800 JK |
399 | * This function should be used by the data read flow only where it |
400 | * does not check the "create" flag that indicates block allocation. | |
401 | * The reason for this special functionality is to exploit VFS readahead | |
402 | * mechanism. | |
403 | */ | |
404 | static int get_data_block_ro(struct inode *inode, sector_t iblock, | |
405 | struct buffer_head *bh_result, int create) | |
406 | { | |
407 | unsigned int blkbits = inode->i_sb->s_blocksize_bits; | |
408 | unsigned maxblocks = bh_result->b_size >> blkbits; | |
409 | struct dnode_of_data dn; | |
410 | pgoff_t pgofs; | |
411 | int err; | |
412 | ||
413 | /* Get the page offset from the block offset(iblock) */ | |
414 | pgofs = (pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits)); | |
415 | ||
848753aa NJ |
416 | if (check_extent_cache(inode, pgofs, bh_result)) { |
417 | trace_f2fs_get_data_block(inode, iblock, bh_result, 0); | |
eb47b800 | 418 | return 0; |
848753aa | 419 | } |
eb47b800 JK |
420 | |
421 | /* When reading holes, we need its node page */ | |
422 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 423 | err = get_dnode_of_data(&dn, pgofs, LOOKUP_NODE_RA); |
848753aa NJ |
424 | if (err) { |
425 | trace_f2fs_get_data_block(inode, iblock, bh_result, err); | |
eb47b800 | 426 | return (err == -ENOENT) ? 0 : err; |
848753aa | 427 | } |
eb47b800 JK |
428 | |
429 | /* It does not support data allocation */ | |
430 | BUG_ON(create); | |
431 | ||
432 | if (dn.data_blkaddr != NEW_ADDR && dn.data_blkaddr != NULL_ADDR) { | |
433 | int i; | |
434 | unsigned int end_offset; | |
435 | ||
436 | end_offset = IS_INODE(dn.node_page) ? | |
437 | ADDRS_PER_INODE : | |
438 | ADDRS_PER_BLOCK; | |
439 | ||
440 | clear_buffer_new(bh_result); | |
441 | ||
442 | /* Give more consecutive addresses for the read ahead */ | |
443 | for (i = 0; i < end_offset - dn.ofs_in_node; i++) | |
444 | if (((datablock_addr(dn.node_page, | |
445 | dn.ofs_in_node + i)) | |
446 | != (dn.data_blkaddr + i)) || maxblocks == i) | |
447 | break; | |
448 | map_bh(bh_result, inode->i_sb, dn.data_blkaddr); | |
449 | bh_result->b_size = (i << blkbits); | |
450 | } | |
451 | f2fs_put_dnode(&dn); | |
848753aa | 452 | trace_f2fs_get_data_block(inode, iblock, bh_result, 0); |
eb47b800 JK |
453 | return 0; |
454 | } | |
455 | ||
456 | static int f2fs_read_data_page(struct file *file, struct page *page) | |
457 | { | |
458 | return mpage_readpage(page, get_data_block_ro); | |
459 | } | |
460 | ||
461 | static int f2fs_read_data_pages(struct file *file, | |
462 | struct address_space *mapping, | |
463 | struct list_head *pages, unsigned nr_pages) | |
464 | { | |
465 | return mpage_readpages(mapping, pages, nr_pages, get_data_block_ro); | |
466 | } | |
467 | ||
468 | int do_write_data_page(struct page *page) | |
469 | { | |
470 | struct inode *inode = page->mapping->host; | |
eb47b800 JK |
471 | block_t old_blk_addr, new_blk_addr; |
472 | struct dnode_of_data dn; | |
473 | int err = 0; | |
474 | ||
475 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 476 | err = get_dnode_of_data(&dn, page->index, LOOKUP_NODE); |
eb47b800 JK |
477 | if (err) |
478 | return err; | |
479 | ||
480 | old_blk_addr = dn.data_blkaddr; | |
481 | ||
482 | /* This page is already truncated */ | |
483 | if (old_blk_addr == NULL_ADDR) | |
484 | goto out_writepage; | |
485 | ||
486 | set_page_writeback(page); | |
487 | ||
488 | /* | |
489 | * If current allocation needs SSR, | |
490 | * it had better in-place writes for updated data. | |
491 | */ | |
492 | if (old_blk_addr != NEW_ADDR && !is_cold_data(page) && | |
493 | need_inplace_update(inode)) { | |
494 | rewrite_data_page(F2FS_SB(inode->i_sb), page, | |
495 | old_blk_addr); | |
496 | } else { | |
497 | write_data_page(inode, page, &dn, | |
498 | old_blk_addr, &new_blk_addr); | |
499 | update_extent_cache(new_blk_addr, &dn); | |
eb47b800 JK |
500 | } |
501 | out_writepage: | |
502 | f2fs_put_dnode(&dn); | |
503 | return err; | |
504 | } | |
505 | ||
506 | static int f2fs_write_data_page(struct page *page, | |
507 | struct writeback_control *wbc) | |
508 | { | |
509 | struct inode *inode = page->mapping->host; | |
510 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
511 | loff_t i_size = i_size_read(inode); | |
512 | const pgoff_t end_index = ((unsigned long long) i_size) | |
513 | >> PAGE_CACHE_SHIFT; | |
514 | unsigned offset; | |
39936837 | 515 | bool need_balance_fs = false; |
eb47b800 JK |
516 | int err = 0; |
517 | ||
518 | if (page->index < end_index) | |
39936837 | 519 | goto write; |
eb47b800 JK |
520 | |
521 | /* | |
522 | * If the offset is out-of-range of file size, | |
523 | * this page does not have to be written to disk. | |
524 | */ | |
525 | offset = i_size & (PAGE_CACHE_SIZE - 1); | |
526 | if ((page->index >= end_index + 1) || !offset) { | |
527 | if (S_ISDIR(inode->i_mode)) { | |
528 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
529 | inode_dec_dirty_dents(inode); | |
530 | } | |
39936837 | 531 | goto out; |
eb47b800 JK |
532 | } |
533 | ||
534 | zero_user_segment(page, offset, PAGE_CACHE_SIZE); | |
39936837 JK |
535 | write: |
536 | if (sbi->por_doing) { | |
537 | err = AOP_WRITEPAGE_ACTIVATE; | |
eb47b800 | 538 | goto redirty_out; |
39936837 | 539 | } |
eb47b800 | 540 | |
39936837 | 541 | /* Dentry blocks are controlled by checkpoint */ |
eb47b800 JK |
542 | if (S_ISDIR(inode->i_mode)) { |
543 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
544 | inode_dec_dirty_dents(inode); | |
39936837 JK |
545 | err = do_write_data_page(page); |
546 | } else { | |
547 | int ilock = mutex_lock_op(sbi); | |
548 | err = do_write_data_page(page); | |
549 | mutex_unlock_op(sbi, ilock); | |
550 | need_balance_fs = true; | |
eb47b800 | 551 | } |
39936837 JK |
552 | if (err == -ENOENT) |
553 | goto out; | |
554 | else if (err) | |
555 | goto redirty_out; | |
eb47b800 JK |
556 | |
557 | if (wbc->for_reclaim) | |
558 | f2fs_submit_bio(sbi, DATA, true); | |
559 | ||
eb47b800 | 560 | clear_cold_data(page); |
39936837 | 561 | out: |
eb47b800 | 562 | unlock_page(page); |
39936837 | 563 | if (need_balance_fs) |
eb47b800 JK |
564 | f2fs_balance_fs(sbi); |
565 | return 0; | |
566 | ||
eb47b800 JK |
567 | redirty_out: |
568 | wbc->pages_skipped++; | |
569 | set_page_dirty(page); | |
39936837 | 570 | return err; |
eb47b800 JK |
571 | } |
572 | ||
573 | #define MAX_DESIRED_PAGES_WP 4096 | |
574 | ||
fa9150a8 NJ |
575 | static int __f2fs_writepage(struct page *page, struct writeback_control *wbc, |
576 | void *data) | |
577 | { | |
578 | struct address_space *mapping = data; | |
579 | int ret = mapping->a_ops->writepage(page, wbc); | |
580 | mapping_set_error(mapping, ret); | |
581 | return ret; | |
582 | } | |
583 | ||
25ca923b | 584 | static int f2fs_write_data_pages(struct address_space *mapping, |
eb47b800 JK |
585 | struct writeback_control *wbc) |
586 | { | |
587 | struct inode *inode = mapping->host; | |
588 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
531ad7d5 | 589 | bool locked = false; |
eb47b800 JK |
590 | int ret; |
591 | long excess_nrtw = 0, desired_nrtw; | |
592 | ||
cfb185a1 | 593 | /* deal with chardevs and other special file */ |
594 | if (!mapping->a_ops->writepage) | |
595 | return 0; | |
596 | ||
eb47b800 JK |
597 | if (wbc->nr_to_write < MAX_DESIRED_PAGES_WP) { |
598 | desired_nrtw = MAX_DESIRED_PAGES_WP; | |
599 | excess_nrtw = desired_nrtw - wbc->nr_to_write; | |
600 | wbc->nr_to_write = desired_nrtw; | |
601 | } | |
602 | ||
531ad7d5 | 603 | if (!S_ISDIR(inode->i_mode)) { |
eb47b800 | 604 | mutex_lock(&sbi->writepages); |
531ad7d5 JK |
605 | locked = true; |
606 | } | |
fa9150a8 | 607 | ret = write_cache_pages(mapping, wbc, __f2fs_writepage, mapping); |
531ad7d5 | 608 | if (locked) |
eb47b800 JK |
609 | mutex_unlock(&sbi->writepages); |
610 | f2fs_submit_bio(sbi, DATA, (wbc->sync_mode == WB_SYNC_ALL)); | |
611 | ||
612 | remove_dirty_dir_inode(inode); | |
613 | ||
614 | wbc->nr_to_write -= excess_nrtw; | |
615 | return ret; | |
616 | } | |
617 | ||
618 | static int f2fs_write_begin(struct file *file, struct address_space *mapping, | |
619 | loff_t pos, unsigned len, unsigned flags, | |
620 | struct page **pagep, void **fsdata) | |
621 | { | |
622 | struct inode *inode = mapping->host; | |
623 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
624 | struct page *page; | |
625 | pgoff_t index = ((unsigned long long) pos) >> PAGE_CACHE_SHIFT; | |
626 | struct dnode_of_data dn; | |
627 | int err = 0; | |
39936837 | 628 | int ilock; |
eb47b800 JK |
629 | |
630 | /* for nobh_write_end */ | |
631 | *fsdata = NULL; | |
632 | ||
633 | f2fs_balance_fs(sbi); | |
afcb7ca0 | 634 | repeat: |
eb47b800 JK |
635 | page = grab_cache_page_write_begin(mapping, index, flags); |
636 | if (!page) | |
637 | return -ENOMEM; | |
638 | *pagep = page; | |
639 | ||
39936837 | 640 | ilock = mutex_lock_op(sbi); |
eb47b800 JK |
641 | |
642 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 643 | err = get_dnode_of_data(&dn, index, ALLOC_NODE); |
39936837 JK |
644 | if (err) |
645 | goto err; | |
eb47b800 | 646 | |
39936837 | 647 | if (dn.data_blkaddr == NULL_ADDR) |
eb47b800 | 648 | err = reserve_new_block(&dn); |
39936837 | 649 | |
eb47b800 | 650 | f2fs_put_dnode(&dn); |
39936837 JK |
651 | if (err) |
652 | goto err; | |
eb47b800 | 653 | |
39936837 | 654 | mutex_unlock_op(sbi, ilock); |
eb47b800 JK |
655 | |
656 | if ((len == PAGE_CACHE_SIZE) || PageUptodate(page)) | |
657 | return 0; | |
658 | ||
659 | if ((pos & PAGE_CACHE_MASK) >= i_size_read(inode)) { | |
660 | unsigned start = pos & (PAGE_CACHE_SIZE - 1); | |
661 | unsigned end = start + len; | |
662 | ||
663 | /* Reading beyond i_size is simple: memset to zero */ | |
664 | zero_user_segments(page, 0, start, end, PAGE_CACHE_SIZE); | |
393ff91f | 665 | goto out; |
eb47b800 JK |
666 | } |
667 | ||
668 | if (dn.data_blkaddr == NEW_ADDR) { | |
669 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
670 | } else { | |
671 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
393ff91f | 672 | if (err) |
eb47b800 | 673 | return err; |
393ff91f JK |
674 | lock_page(page); |
675 | if (!PageUptodate(page)) { | |
676 | f2fs_put_page(page, 1); | |
677 | return -EIO; | |
eb47b800 | 678 | } |
afcb7ca0 JK |
679 | if (page->mapping != mapping) { |
680 | f2fs_put_page(page, 1); | |
681 | goto repeat; | |
eb47b800 JK |
682 | } |
683 | } | |
393ff91f | 684 | out: |
eb47b800 JK |
685 | SetPageUptodate(page); |
686 | clear_cold_data(page); | |
687 | return 0; | |
39936837 JK |
688 | |
689 | err: | |
690 | mutex_unlock_op(sbi, ilock); | |
691 | f2fs_put_page(page, 1); | |
692 | return err; | |
eb47b800 JK |
693 | } |
694 | ||
695 | static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb, | |
696 | const struct iovec *iov, loff_t offset, unsigned long nr_segs) | |
697 | { | |
698 | struct file *file = iocb->ki_filp; | |
699 | struct inode *inode = file->f_mapping->host; | |
700 | ||
701 | if (rw == WRITE) | |
702 | return 0; | |
703 | ||
704 | /* Needs synchronization with the cleaner */ | |
705 | return blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs, | |
706 | get_data_block_ro); | |
707 | } | |
708 | ||
709 | static void f2fs_invalidate_data_page(struct page *page, unsigned long offset) | |
710 | { | |
711 | struct inode *inode = page->mapping->host; | |
712 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
713 | if (S_ISDIR(inode->i_mode) && PageDirty(page)) { | |
714 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
715 | inode_dec_dirty_dents(inode); | |
716 | } | |
717 | ClearPagePrivate(page); | |
718 | } | |
719 | ||
720 | static int f2fs_release_data_page(struct page *page, gfp_t wait) | |
721 | { | |
722 | ClearPagePrivate(page); | |
c3850aa1 | 723 | return 1; |
eb47b800 JK |
724 | } |
725 | ||
726 | static int f2fs_set_data_page_dirty(struct page *page) | |
727 | { | |
728 | struct address_space *mapping = page->mapping; | |
729 | struct inode *inode = mapping->host; | |
730 | ||
731 | SetPageUptodate(page); | |
732 | if (!PageDirty(page)) { | |
733 | __set_page_dirty_nobuffers(page); | |
734 | set_dirty_dir_page(inode, page); | |
735 | return 1; | |
736 | } | |
737 | return 0; | |
738 | } | |
739 | ||
c01e54b7 JK |
740 | static sector_t f2fs_bmap(struct address_space *mapping, sector_t block) |
741 | { | |
742 | return generic_block_bmap(mapping, block, get_data_block_ro); | |
743 | } | |
744 | ||
eb47b800 JK |
745 | const struct address_space_operations f2fs_dblock_aops = { |
746 | .readpage = f2fs_read_data_page, | |
747 | .readpages = f2fs_read_data_pages, | |
748 | .writepage = f2fs_write_data_page, | |
749 | .writepages = f2fs_write_data_pages, | |
750 | .write_begin = f2fs_write_begin, | |
751 | .write_end = nobh_write_end, | |
752 | .set_page_dirty = f2fs_set_data_page_dirty, | |
753 | .invalidatepage = f2fs_invalidate_data_page, | |
754 | .releasepage = f2fs_release_data_page, | |
755 | .direct_IO = f2fs_direct_IO, | |
c01e54b7 | 756 | .bmap = f2fs_bmap, |
eb47b800 | 757 | }; |