Commit | Line | Data |
---|---|---|
0a8165d7 | 1 | /* |
eb47b800 JK |
2 | * fs/f2fs/data.c |
3 | * | |
4 | * Copyright (c) 2012 Samsung Electronics Co., Ltd. | |
5 | * http://www.samsung.com/ | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #include <linux/fs.h> | |
12 | #include <linux/f2fs_fs.h> | |
13 | #include <linux/buffer_head.h> | |
14 | #include <linux/mpage.h> | |
15 | #include <linux/writeback.h> | |
16 | #include <linux/backing-dev.h> | |
17 | #include <linux/blkdev.h> | |
18 | #include <linux/bio.h> | |
690e4a3e | 19 | #include <linux/prefetch.h> |
eb47b800 JK |
20 | |
21 | #include "f2fs.h" | |
22 | #include "node.h" | |
23 | #include "segment.h" | |
848753aa | 24 | #include <trace/events/f2fs.h> |
eb47b800 | 25 | |
0a8165d7 | 26 | /* |
eb47b800 JK |
27 | * Lock ordering for the change of data block address: |
28 | * ->data_page | |
29 | * ->node_page | |
30 | * update block addresses in the node page | |
31 | */ | |
32 | static void __set_data_blkaddr(struct dnode_of_data *dn, block_t new_addr) | |
33 | { | |
34 | struct f2fs_node *rn; | |
35 | __le32 *addr_array; | |
36 | struct page *node_page = dn->node_page; | |
37 | unsigned int ofs_in_node = dn->ofs_in_node; | |
38 | ||
39 | wait_on_page_writeback(node_page); | |
40 | ||
41 | rn = (struct f2fs_node *)page_address(node_page); | |
42 | ||
43 | /* Get physical address of data block */ | |
44 | addr_array = blkaddr_in_node(rn); | |
45 | addr_array[ofs_in_node] = cpu_to_le32(new_addr); | |
46 | set_page_dirty(node_page); | |
47 | } | |
48 | ||
49 | int reserve_new_block(struct dnode_of_data *dn) | |
50 | { | |
51 | struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb); | |
52 | ||
53 | if (is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)) | |
54 | return -EPERM; | |
55 | if (!inc_valid_block_count(sbi, dn->inode, 1)) | |
56 | return -ENOSPC; | |
57 | ||
c01e2853 NJ |
58 | trace_f2fs_reserve_new_block(dn->inode, dn->nid, dn->ofs_in_node); |
59 | ||
eb47b800 JK |
60 | __set_data_blkaddr(dn, NEW_ADDR); |
61 | dn->data_blkaddr = NEW_ADDR; | |
62 | sync_inode_page(dn); | |
63 | return 0; | |
64 | } | |
65 | ||
66 | static int check_extent_cache(struct inode *inode, pgoff_t pgofs, | |
67 | struct buffer_head *bh_result) | |
68 | { | |
69 | struct f2fs_inode_info *fi = F2FS_I(inode); | |
70 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
71 | pgoff_t start_fofs, end_fofs; | |
72 | block_t start_blkaddr; | |
73 | ||
74 | read_lock(&fi->ext.ext_lock); | |
75 | if (fi->ext.len == 0) { | |
76 | read_unlock(&fi->ext.ext_lock); | |
77 | return 0; | |
78 | } | |
79 | ||
80 | sbi->total_hit_ext++; | |
81 | start_fofs = fi->ext.fofs; | |
82 | end_fofs = fi->ext.fofs + fi->ext.len - 1; | |
83 | start_blkaddr = fi->ext.blk_addr; | |
84 | ||
85 | if (pgofs >= start_fofs && pgofs <= end_fofs) { | |
86 | unsigned int blkbits = inode->i_sb->s_blocksize_bits; | |
87 | size_t count; | |
88 | ||
89 | clear_buffer_new(bh_result); | |
90 | map_bh(bh_result, inode->i_sb, | |
91 | start_blkaddr + pgofs - start_fofs); | |
92 | count = end_fofs - pgofs + 1; | |
93 | if (count < (UINT_MAX >> blkbits)) | |
94 | bh_result->b_size = (count << blkbits); | |
95 | else | |
96 | bh_result->b_size = UINT_MAX; | |
97 | ||
98 | sbi->read_hit_ext++; | |
99 | read_unlock(&fi->ext.ext_lock); | |
100 | return 1; | |
101 | } | |
102 | read_unlock(&fi->ext.ext_lock); | |
103 | return 0; | |
104 | } | |
105 | ||
106 | void update_extent_cache(block_t blk_addr, struct dnode_of_data *dn) | |
107 | { | |
108 | struct f2fs_inode_info *fi = F2FS_I(dn->inode); | |
109 | pgoff_t fofs, start_fofs, end_fofs; | |
110 | block_t start_blkaddr, end_blkaddr; | |
111 | ||
112 | BUG_ON(blk_addr == NEW_ADDR); | |
113 | fofs = start_bidx_of_node(ofs_of_node(dn->node_page)) + dn->ofs_in_node; | |
114 | ||
115 | /* Update the page address in the parent node */ | |
116 | __set_data_blkaddr(dn, blk_addr); | |
117 | ||
118 | write_lock(&fi->ext.ext_lock); | |
119 | ||
120 | start_fofs = fi->ext.fofs; | |
121 | end_fofs = fi->ext.fofs + fi->ext.len - 1; | |
122 | start_blkaddr = fi->ext.blk_addr; | |
123 | end_blkaddr = fi->ext.blk_addr + fi->ext.len - 1; | |
124 | ||
125 | /* Drop and initialize the matched extent */ | |
126 | if (fi->ext.len == 1 && fofs == start_fofs) | |
127 | fi->ext.len = 0; | |
128 | ||
129 | /* Initial extent */ | |
130 | if (fi->ext.len == 0) { | |
131 | if (blk_addr != NULL_ADDR) { | |
132 | fi->ext.fofs = fofs; | |
133 | fi->ext.blk_addr = blk_addr; | |
134 | fi->ext.len = 1; | |
135 | } | |
136 | goto end_update; | |
137 | } | |
138 | ||
6224da87 | 139 | /* Front merge */ |
eb47b800 JK |
140 | if (fofs == start_fofs - 1 && blk_addr == start_blkaddr - 1) { |
141 | fi->ext.fofs--; | |
142 | fi->ext.blk_addr--; | |
143 | fi->ext.len++; | |
144 | goto end_update; | |
145 | } | |
146 | ||
147 | /* Back merge */ | |
148 | if (fofs == end_fofs + 1 && blk_addr == end_blkaddr + 1) { | |
149 | fi->ext.len++; | |
150 | goto end_update; | |
151 | } | |
152 | ||
153 | /* Split the existing extent */ | |
154 | if (fi->ext.len > 1 && | |
155 | fofs >= start_fofs && fofs <= end_fofs) { | |
156 | if ((end_fofs - fofs) < (fi->ext.len >> 1)) { | |
157 | fi->ext.len = fofs - start_fofs; | |
158 | } else { | |
159 | fi->ext.fofs = fofs + 1; | |
160 | fi->ext.blk_addr = start_blkaddr + | |
161 | fofs - start_fofs + 1; | |
162 | fi->ext.len -= fofs - start_fofs + 1; | |
163 | } | |
164 | goto end_update; | |
165 | } | |
166 | write_unlock(&fi->ext.ext_lock); | |
167 | return; | |
168 | ||
169 | end_update: | |
170 | write_unlock(&fi->ext.ext_lock); | |
171 | sync_inode_page(dn); | |
172 | return; | |
173 | } | |
174 | ||
175 | struct page *find_data_page(struct inode *inode, pgoff_t index) | |
176 | { | |
177 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
178 | struct address_space *mapping = inode->i_mapping; | |
179 | struct dnode_of_data dn; | |
180 | struct page *page; | |
181 | int err; | |
182 | ||
183 | page = find_get_page(mapping, index); | |
184 | if (page && PageUptodate(page)) | |
185 | return page; | |
186 | f2fs_put_page(page, 0); | |
187 | ||
188 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 189 | err = get_dnode_of_data(&dn, index, LOOKUP_NODE); |
eb47b800 JK |
190 | if (err) |
191 | return ERR_PTR(err); | |
192 | f2fs_put_dnode(&dn); | |
193 | ||
194 | if (dn.data_blkaddr == NULL_ADDR) | |
195 | return ERR_PTR(-ENOENT); | |
196 | ||
197 | /* By fallocate(), there is no cached page, but with NEW_ADDR */ | |
198 | if (dn.data_blkaddr == NEW_ADDR) | |
199 | return ERR_PTR(-EINVAL); | |
200 | ||
201 | page = grab_cache_page(mapping, index); | |
202 | if (!page) | |
203 | return ERR_PTR(-ENOMEM); | |
204 | ||
393ff91f JK |
205 | if (PageUptodate(page)) { |
206 | unlock_page(page); | |
207 | return page; | |
208 | } | |
209 | ||
eb47b800 | 210 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); |
393ff91f JK |
211 | wait_on_page_locked(page); |
212 | if (!PageUptodate(page)) { | |
213 | f2fs_put_page(page, 0); | |
214 | return ERR_PTR(-EIO); | |
eb47b800 | 215 | } |
eb47b800 JK |
216 | return page; |
217 | } | |
218 | ||
0a8165d7 | 219 | /* |
eb47b800 JK |
220 | * If it tries to access a hole, return an error. |
221 | * Because, the callers, functions in dir.c and GC, should be able to know | |
222 | * whether this page exists or not. | |
223 | */ | |
224 | struct page *get_lock_data_page(struct inode *inode, pgoff_t index) | |
225 | { | |
226 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
227 | struct address_space *mapping = inode->i_mapping; | |
228 | struct dnode_of_data dn; | |
229 | struct page *page; | |
230 | int err; | |
231 | ||
232 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 233 | err = get_dnode_of_data(&dn, index, LOOKUP_NODE); |
eb47b800 JK |
234 | if (err) |
235 | return ERR_PTR(err); | |
236 | f2fs_put_dnode(&dn); | |
237 | ||
238 | if (dn.data_blkaddr == NULL_ADDR) | |
239 | return ERR_PTR(-ENOENT); | |
240 | ||
241 | page = grab_cache_page(mapping, index); | |
242 | if (!page) | |
243 | return ERR_PTR(-ENOMEM); | |
244 | ||
245 | if (PageUptodate(page)) | |
246 | return page; | |
247 | ||
248 | BUG_ON(dn.data_blkaddr == NEW_ADDR); | |
249 | BUG_ON(dn.data_blkaddr == NULL_ADDR); | |
250 | ||
251 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
393ff91f | 252 | if (err) |
eb47b800 | 253 | return ERR_PTR(err); |
393ff91f JK |
254 | |
255 | lock_page(page); | |
256 | if (!PageUptodate(page)) { | |
257 | f2fs_put_page(page, 1); | |
258 | return ERR_PTR(-EIO); | |
eb47b800 JK |
259 | } |
260 | return page; | |
261 | } | |
262 | ||
0a8165d7 | 263 | /* |
eb47b800 JK |
264 | * Caller ensures that this data page is never allocated. |
265 | * A new zero-filled data page is allocated in the page cache. | |
39936837 JK |
266 | * |
267 | * Also, caller should grab and release a mutex by calling mutex_lock_op() and | |
268 | * mutex_unlock_op(). | |
eb47b800 JK |
269 | */ |
270 | struct page *get_new_data_page(struct inode *inode, pgoff_t index, | |
271 | bool new_i_size) | |
272 | { | |
273 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
274 | struct address_space *mapping = inode->i_mapping; | |
275 | struct page *page; | |
276 | struct dnode_of_data dn; | |
277 | int err; | |
278 | ||
279 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 280 | err = get_dnode_of_data(&dn, index, ALLOC_NODE); |
eb47b800 JK |
281 | if (err) |
282 | return ERR_PTR(err); | |
283 | ||
284 | if (dn.data_blkaddr == NULL_ADDR) { | |
285 | if (reserve_new_block(&dn)) { | |
286 | f2fs_put_dnode(&dn); | |
287 | return ERR_PTR(-ENOSPC); | |
288 | } | |
289 | } | |
290 | f2fs_put_dnode(&dn); | |
291 | ||
292 | page = grab_cache_page(mapping, index); | |
293 | if (!page) | |
294 | return ERR_PTR(-ENOMEM); | |
295 | ||
296 | if (PageUptodate(page)) | |
297 | return page; | |
298 | ||
299 | if (dn.data_blkaddr == NEW_ADDR) { | |
300 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
393ff91f | 301 | SetPageUptodate(page); |
eb47b800 JK |
302 | } else { |
303 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
393ff91f | 304 | if (err) |
eb47b800 | 305 | return ERR_PTR(err); |
393ff91f JK |
306 | lock_page(page); |
307 | if (!PageUptodate(page)) { | |
308 | f2fs_put_page(page, 1); | |
309 | return ERR_PTR(-EIO); | |
eb47b800 JK |
310 | } |
311 | } | |
eb47b800 JK |
312 | |
313 | if (new_i_size && | |
314 | i_size_read(inode) < ((index + 1) << PAGE_CACHE_SHIFT)) { | |
315 | i_size_write(inode, ((index + 1) << PAGE_CACHE_SHIFT)); | |
316 | mark_inode_dirty_sync(inode); | |
317 | } | |
318 | return page; | |
319 | } | |
320 | ||
321 | static void read_end_io(struct bio *bio, int err) | |
322 | { | |
323 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
324 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | |
325 | ||
326 | do { | |
327 | struct page *page = bvec->bv_page; | |
328 | ||
329 | if (--bvec >= bio->bi_io_vec) | |
330 | prefetchw(&bvec->bv_page->flags); | |
331 | ||
332 | if (uptodate) { | |
333 | SetPageUptodate(page); | |
334 | } else { | |
335 | ClearPageUptodate(page); | |
336 | SetPageError(page); | |
337 | } | |
338 | unlock_page(page); | |
339 | } while (bvec >= bio->bi_io_vec); | |
340 | kfree(bio->bi_private); | |
341 | bio_put(bio); | |
342 | } | |
343 | ||
0a8165d7 | 344 | /* |
eb47b800 | 345 | * Fill the locked page with data located in the block address. |
393ff91f | 346 | * Return unlocked page. |
eb47b800 JK |
347 | */ |
348 | int f2fs_readpage(struct f2fs_sb_info *sbi, struct page *page, | |
349 | block_t blk_addr, int type) | |
350 | { | |
351 | struct block_device *bdev = sbi->sb->s_bdev; | |
eb47b800 JK |
352 | struct bio *bio; |
353 | ||
848753aa NJ |
354 | trace_f2fs_readpage(page, blk_addr, type); |
355 | ||
eb47b800 JK |
356 | down_read(&sbi->bio_sem); |
357 | ||
358 | /* Allocate a new bio */ | |
3cd8a239 | 359 | bio = f2fs_bio_alloc(bdev, 1); |
eb47b800 JK |
360 | |
361 | /* Initialize the bio */ | |
3cd8a239 | 362 | bio->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr); |
eb47b800 | 363 | bio->bi_end_io = read_end_io; |
3cd8a239 | 364 | |
eb47b800 JK |
365 | if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) { |
366 | kfree(bio->bi_private); | |
367 | bio_put(bio); | |
368 | up_read(&sbi->bio_sem); | |
393ff91f | 369 | f2fs_put_page(page, 1); |
eb47b800 JK |
370 | return -EFAULT; |
371 | } | |
372 | ||
373 | submit_bio(type, bio); | |
374 | up_read(&sbi->bio_sem); | |
eb47b800 JK |
375 | return 0; |
376 | } | |
377 | ||
0a8165d7 | 378 | /* |
eb47b800 JK |
379 | * This function should be used by the data read flow only where it |
380 | * does not check the "create" flag that indicates block allocation. | |
381 | * The reason for this special functionality is to exploit VFS readahead | |
382 | * mechanism. | |
383 | */ | |
384 | static int get_data_block_ro(struct inode *inode, sector_t iblock, | |
385 | struct buffer_head *bh_result, int create) | |
386 | { | |
387 | unsigned int blkbits = inode->i_sb->s_blocksize_bits; | |
388 | unsigned maxblocks = bh_result->b_size >> blkbits; | |
389 | struct dnode_of_data dn; | |
390 | pgoff_t pgofs; | |
391 | int err; | |
392 | ||
393 | /* Get the page offset from the block offset(iblock) */ | |
394 | pgofs = (pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits)); | |
395 | ||
848753aa NJ |
396 | if (check_extent_cache(inode, pgofs, bh_result)) { |
397 | trace_f2fs_get_data_block(inode, iblock, bh_result, 0); | |
eb47b800 | 398 | return 0; |
848753aa | 399 | } |
eb47b800 JK |
400 | |
401 | /* When reading holes, we need its node page */ | |
402 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 403 | err = get_dnode_of_data(&dn, pgofs, LOOKUP_NODE_RA); |
848753aa NJ |
404 | if (err) { |
405 | trace_f2fs_get_data_block(inode, iblock, bh_result, err); | |
eb47b800 | 406 | return (err == -ENOENT) ? 0 : err; |
848753aa | 407 | } |
eb47b800 JK |
408 | |
409 | /* It does not support data allocation */ | |
410 | BUG_ON(create); | |
411 | ||
412 | if (dn.data_blkaddr != NEW_ADDR && dn.data_blkaddr != NULL_ADDR) { | |
413 | int i; | |
414 | unsigned int end_offset; | |
415 | ||
416 | end_offset = IS_INODE(dn.node_page) ? | |
417 | ADDRS_PER_INODE : | |
418 | ADDRS_PER_BLOCK; | |
419 | ||
420 | clear_buffer_new(bh_result); | |
421 | ||
422 | /* Give more consecutive addresses for the read ahead */ | |
423 | for (i = 0; i < end_offset - dn.ofs_in_node; i++) | |
424 | if (((datablock_addr(dn.node_page, | |
425 | dn.ofs_in_node + i)) | |
426 | != (dn.data_blkaddr + i)) || maxblocks == i) | |
427 | break; | |
428 | map_bh(bh_result, inode->i_sb, dn.data_blkaddr); | |
429 | bh_result->b_size = (i << blkbits); | |
430 | } | |
431 | f2fs_put_dnode(&dn); | |
848753aa | 432 | trace_f2fs_get_data_block(inode, iblock, bh_result, 0); |
eb47b800 JK |
433 | return 0; |
434 | } | |
435 | ||
436 | static int f2fs_read_data_page(struct file *file, struct page *page) | |
437 | { | |
438 | return mpage_readpage(page, get_data_block_ro); | |
439 | } | |
440 | ||
441 | static int f2fs_read_data_pages(struct file *file, | |
442 | struct address_space *mapping, | |
443 | struct list_head *pages, unsigned nr_pages) | |
444 | { | |
445 | return mpage_readpages(mapping, pages, nr_pages, get_data_block_ro); | |
446 | } | |
447 | ||
448 | int do_write_data_page(struct page *page) | |
449 | { | |
450 | struct inode *inode = page->mapping->host; | |
eb47b800 JK |
451 | block_t old_blk_addr, new_blk_addr; |
452 | struct dnode_of_data dn; | |
453 | int err = 0; | |
454 | ||
455 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 456 | err = get_dnode_of_data(&dn, page->index, LOOKUP_NODE); |
eb47b800 JK |
457 | if (err) |
458 | return err; | |
459 | ||
460 | old_blk_addr = dn.data_blkaddr; | |
461 | ||
462 | /* This page is already truncated */ | |
463 | if (old_blk_addr == NULL_ADDR) | |
464 | goto out_writepage; | |
465 | ||
466 | set_page_writeback(page); | |
467 | ||
468 | /* | |
469 | * If current allocation needs SSR, | |
470 | * it had better in-place writes for updated data. | |
471 | */ | |
472 | if (old_blk_addr != NEW_ADDR && !is_cold_data(page) && | |
473 | need_inplace_update(inode)) { | |
474 | rewrite_data_page(F2FS_SB(inode->i_sb), page, | |
475 | old_blk_addr); | |
476 | } else { | |
477 | write_data_page(inode, page, &dn, | |
478 | old_blk_addr, &new_blk_addr); | |
479 | update_extent_cache(new_blk_addr, &dn); | |
eb47b800 JK |
480 | } |
481 | out_writepage: | |
482 | f2fs_put_dnode(&dn); | |
483 | return err; | |
484 | } | |
485 | ||
486 | static int f2fs_write_data_page(struct page *page, | |
487 | struct writeback_control *wbc) | |
488 | { | |
489 | struct inode *inode = page->mapping->host; | |
490 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
491 | loff_t i_size = i_size_read(inode); | |
492 | const pgoff_t end_index = ((unsigned long long) i_size) | |
493 | >> PAGE_CACHE_SHIFT; | |
494 | unsigned offset; | |
39936837 | 495 | bool need_balance_fs = false; |
eb47b800 JK |
496 | int err = 0; |
497 | ||
498 | if (page->index < end_index) | |
39936837 | 499 | goto write; |
eb47b800 JK |
500 | |
501 | /* | |
502 | * If the offset is out-of-range of file size, | |
503 | * this page does not have to be written to disk. | |
504 | */ | |
505 | offset = i_size & (PAGE_CACHE_SIZE - 1); | |
506 | if ((page->index >= end_index + 1) || !offset) { | |
507 | if (S_ISDIR(inode->i_mode)) { | |
508 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
509 | inode_dec_dirty_dents(inode); | |
510 | } | |
39936837 | 511 | goto out; |
eb47b800 JK |
512 | } |
513 | ||
514 | zero_user_segment(page, offset, PAGE_CACHE_SIZE); | |
39936837 JK |
515 | write: |
516 | if (sbi->por_doing) { | |
517 | err = AOP_WRITEPAGE_ACTIVATE; | |
eb47b800 | 518 | goto redirty_out; |
39936837 | 519 | } |
eb47b800 | 520 | |
39936837 | 521 | /* Dentry blocks are controlled by checkpoint */ |
eb47b800 JK |
522 | if (S_ISDIR(inode->i_mode)) { |
523 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
524 | inode_dec_dirty_dents(inode); | |
39936837 JK |
525 | err = do_write_data_page(page); |
526 | } else { | |
527 | int ilock = mutex_lock_op(sbi); | |
528 | err = do_write_data_page(page); | |
529 | mutex_unlock_op(sbi, ilock); | |
530 | need_balance_fs = true; | |
eb47b800 | 531 | } |
39936837 JK |
532 | if (err == -ENOENT) |
533 | goto out; | |
534 | else if (err) | |
535 | goto redirty_out; | |
eb47b800 JK |
536 | |
537 | if (wbc->for_reclaim) | |
538 | f2fs_submit_bio(sbi, DATA, true); | |
539 | ||
eb47b800 | 540 | clear_cold_data(page); |
39936837 | 541 | out: |
eb47b800 | 542 | unlock_page(page); |
39936837 | 543 | if (need_balance_fs) |
eb47b800 JK |
544 | f2fs_balance_fs(sbi); |
545 | return 0; | |
546 | ||
eb47b800 JK |
547 | redirty_out: |
548 | wbc->pages_skipped++; | |
549 | set_page_dirty(page); | |
39936837 | 550 | return err; |
eb47b800 JK |
551 | } |
552 | ||
553 | #define MAX_DESIRED_PAGES_WP 4096 | |
554 | ||
fa9150a8 NJ |
555 | static int __f2fs_writepage(struct page *page, struct writeback_control *wbc, |
556 | void *data) | |
557 | { | |
558 | struct address_space *mapping = data; | |
559 | int ret = mapping->a_ops->writepage(page, wbc); | |
560 | mapping_set_error(mapping, ret); | |
561 | return ret; | |
562 | } | |
563 | ||
25ca923b | 564 | static int f2fs_write_data_pages(struct address_space *mapping, |
eb47b800 JK |
565 | struct writeback_control *wbc) |
566 | { | |
567 | struct inode *inode = mapping->host; | |
568 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
569 | int ret; | |
570 | long excess_nrtw = 0, desired_nrtw; | |
571 | ||
cfb185a1 | 572 | /* deal with chardevs and other special file */ |
573 | if (!mapping->a_ops->writepage) | |
574 | return 0; | |
575 | ||
eb47b800 JK |
576 | if (wbc->nr_to_write < MAX_DESIRED_PAGES_WP) { |
577 | desired_nrtw = MAX_DESIRED_PAGES_WP; | |
578 | excess_nrtw = desired_nrtw - wbc->nr_to_write; | |
579 | wbc->nr_to_write = desired_nrtw; | |
580 | } | |
581 | ||
582 | if (!S_ISDIR(inode->i_mode)) | |
583 | mutex_lock(&sbi->writepages); | |
fa9150a8 | 584 | ret = write_cache_pages(mapping, wbc, __f2fs_writepage, mapping); |
eb47b800 JK |
585 | if (!S_ISDIR(inode->i_mode)) |
586 | mutex_unlock(&sbi->writepages); | |
587 | f2fs_submit_bio(sbi, DATA, (wbc->sync_mode == WB_SYNC_ALL)); | |
588 | ||
589 | remove_dirty_dir_inode(inode); | |
590 | ||
591 | wbc->nr_to_write -= excess_nrtw; | |
592 | return ret; | |
593 | } | |
594 | ||
595 | static int f2fs_write_begin(struct file *file, struct address_space *mapping, | |
596 | loff_t pos, unsigned len, unsigned flags, | |
597 | struct page **pagep, void **fsdata) | |
598 | { | |
599 | struct inode *inode = mapping->host; | |
600 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
601 | struct page *page; | |
602 | pgoff_t index = ((unsigned long long) pos) >> PAGE_CACHE_SHIFT; | |
603 | struct dnode_of_data dn; | |
604 | int err = 0; | |
39936837 | 605 | int ilock; |
eb47b800 JK |
606 | |
607 | /* for nobh_write_end */ | |
608 | *fsdata = NULL; | |
609 | ||
610 | f2fs_balance_fs(sbi); | |
611 | ||
612 | page = grab_cache_page_write_begin(mapping, index, flags); | |
613 | if (!page) | |
614 | return -ENOMEM; | |
615 | *pagep = page; | |
616 | ||
39936837 | 617 | ilock = mutex_lock_op(sbi); |
eb47b800 JK |
618 | |
619 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 620 | err = get_dnode_of_data(&dn, index, ALLOC_NODE); |
39936837 JK |
621 | if (err) |
622 | goto err; | |
eb47b800 | 623 | |
39936837 | 624 | if (dn.data_blkaddr == NULL_ADDR) |
eb47b800 | 625 | err = reserve_new_block(&dn); |
39936837 | 626 | |
eb47b800 | 627 | f2fs_put_dnode(&dn); |
39936837 JK |
628 | if (err) |
629 | goto err; | |
eb47b800 | 630 | |
39936837 | 631 | mutex_unlock_op(sbi, ilock); |
eb47b800 JK |
632 | |
633 | if ((len == PAGE_CACHE_SIZE) || PageUptodate(page)) | |
634 | return 0; | |
635 | ||
636 | if ((pos & PAGE_CACHE_MASK) >= i_size_read(inode)) { | |
637 | unsigned start = pos & (PAGE_CACHE_SIZE - 1); | |
638 | unsigned end = start + len; | |
639 | ||
640 | /* Reading beyond i_size is simple: memset to zero */ | |
641 | zero_user_segments(page, 0, start, end, PAGE_CACHE_SIZE); | |
393ff91f | 642 | goto out; |
eb47b800 JK |
643 | } |
644 | ||
645 | if (dn.data_blkaddr == NEW_ADDR) { | |
646 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
647 | } else { | |
648 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
393ff91f | 649 | if (err) |
eb47b800 | 650 | return err; |
393ff91f JK |
651 | lock_page(page); |
652 | if (!PageUptodate(page)) { | |
653 | f2fs_put_page(page, 1); | |
654 | return -EIO; | |
eb47b800 JK |
655 | } |
656 | } | |
393ff91f | 657 | out: |
eb47b800 JK |
658 | SetPageUptodate(page); |
659 | clear_cold_data(page); | |
660 | return 0; | |
39936837 JK |
661 | |
662 | err: | |
663 | mutex_unlock_op(sbi, ilock); | |
664 | f2fs_put_page(page, 1); | |
665 | return err; | |
eb47b800 JK |
666 | } |
667 | ||
668 | static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb, | |
669 | const struct iovec *iov, loff_t offset, unsigned long nr_segs) | |
670 | { | |
671 | struct file *file = iocb->ki_filp; | |
672 | struct inode *inode = file->f_mapping->host; | |
673 | ||
674 | if (rw == WRITE) | |
675 | return 0; | |
676 | ||
677 | /* Needs synchronization with the cleaner */ | |
678 | return blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs, | |
679 | get_data_block_ro); | |
680 | } | |
681 | ||
682 | static void f2fs_invalidate_data_page(struct page *page, unsigned long offset) | |
683 | { | |
684 | struct inode *inode = page->mapping->host; | |
685 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
686 | if (S_ISDIR(inode->i_mode) && PageDirty(page)) { | |
687 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
688 | inode_dec_dirty_dents(inode); | |
689 | } | |
690 | ClearPagePrivate(page); | |
691 | } | |
692 | ||
693 | static int f2fs_release_data_page(struct page *page, gfp_t wait) | |
694 | { | |
695 | ClearPagePrivate(page); | |
c3850aa1 | 696 | return 1; |
eb47b800 JK |
697 | } |
698 | ||
699 | static int f2fs_set_data_page_dirty(struct page *page) | |
700 | { | |
701 | struct address_space *mapping = page->mapping; | |
702 | struct inode *inode = mapping->host; | |
703 | ||
704 | SetPageUptodate(page); | |
705 | if (!PageDirty(page)) { | |
706 | __set_page_dirty_nobuffers(page); | |
707 | set_dirty_dir_page(inode, page); | |
708 | return 1; | |
709 | } | |
710 | return 0; | |
711 | } | |
712 | ||
c01e54b7 JK |
713 | static sector_t f2fs_bmap(struct address_space *mapping, sector_t block) |
714 | { | |
715 | return generic_block_bmap(mapping, block, get_data_block_ro); | |
716 | } | |
717 | ||
eb47b800 JK |
718 | const struct address_space_operations f2fs_dblock_aops = { |
719 | .readpage = f2fs_read_data_page, | |
720 | .readpages = f2fs_read_data_pages, | |
721 | .writepage = f2fs_write_data_page, | |
722 | .writepages = f2fs_write_data_pages, | |
723 | .write_begin = f2fs_write_begin, | |
724 | .write_end = nobh_write_end, | |
725 | .set_page_dirty = f2fs_set_data_page_dirty, | |
726 | .invalidatepage = f2fs_invalidate_data_page, | |
727 | .releasepage = f2fs_release_data_page, | |
728 | .direct_IO = f2fs_direct_IO, | |
c01e54b7 | 729 | .bmap = f2fs_bmap, |
eb47b800 | 730 | }; |