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 | |
93dfe2ac JK |
27 | static void f2fs_read_end_io(struct bio *bio, int err) |
28 | { | |
f568849e LT |
29 | struct bio_vec *bvec; |
30 | int i; | |
93dfe2ac | 31 | |
f568849e | 32 | bio_for_each_segment_all(bvec, bio, i) { |
93dfe2ac JK |
33 | struct page *page = bvec->bv_page; |
34 | ||
f568849e LT |
35 | if (!err) { |
36 | SetPageUptodate(page); | |
37 | } else { | |
93dfe2ac JK |
38 | ClearPageUptodate(page); |
39 | SetPageError(page); | |
40 | } | |
41 | unlock_page(page); | |
f568849e | 42 | } |
93dfe2ac JK |
43 | bio_put(bio); |
44 | } | |
45 | ||
46 | static void f2fs_write_end_io(struct bio *bio, int err) | |
47 | { | |
f568849e LT |
48 | struct f2fs_sb_info *sbi = F2FS_SB(bio->bi_io_vec->bv_page->mapping->host->i_sb); |
49 | struct bio_vec *bvec; | |
50 | int i; | |
93dfe2ac | 51 | |
f568849e | 52 | bio_for_each_segment_all(bvec, bio, i) { |
93dfe2ac JK |
53 | struct page *page = bvec->bv_page; |
54 | ||
f568849e | 55 | if (unlikely(err)) { |
93dfe2ac JK |
56 | SetPageError(page); |
57 | set_bit(AS_EIO, &page->mapping->flags); | |
744602cf | 58 | f2fs_stop_checkpoint(sbi); |
93dfe2ac JK |
59 | } |
60 | end_page_writeback(page); | |
61 | dec_page_count(sbi, F2FS_WRITEBACK); | |
f568849e | 62 | } |
93dfe2ac JK |
63 | |
64 | if (bio->bi_private) | |
65 | complete(bio->bi_private); | |
66 | ||
67 | if (!get_pages(sbi, F2FS_WRITEBACK) && | |
68 | !list_empty(&sbi->cp_wait.task_list)) | |
69 | wake_up(&sbi->cp_wait); | |
70 | ||
71 | bio_put(bio); | |
72 | } | |
73 | ||
940a6d34 GZ |
74 | /* |
75 | * Low-level block read/write IO operations. | |
76 | */ | |
77 | static struct bio *__bio_alloc(struct f2fs_sb_info *sbi, block_t blk_addr, | |
78 | int npages, bool is_read) | |
79 | { | |
80 | struct bio *bio; | |
81 | ||
82 | /* No failure on bio allocation */ | |
83 | bio = bio_alloc(GFP_NOIO, npages); | |
84 | ||
85 | bio->bi_bdev = sbi->sb->s_bdev; | |
f568849e | 86 | bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr); |
940a6d34 GZ |
87 | bio->bi_end_io = is_read ? f2fs_read_end_io : f2fs_write_end_io; |
88 | ||
89 | return bio; | |
90 | } | |
91 | ||
458e6197 | 92 | static void __submit_merged_bio(struct f2fs_bio_info *io) |
93dfe2ac | 93 | { |
458e6197 JK |
94 | struct f2fs_io_info *fio = &io->fio; |
95 | int rw; | |
93dfe2ac JK |
96 | |
97 | if (!io->bio) | |
98 | return; | |
99 | ||
7e8f2308 | 100 | rw = fio->rw; |
93dfe2ac JK |
101 | |
102 | if (is_read_io(rw)) { | |
940a6d34 GZ |
103 | trace_f2fs_submit_read_bio(io->sbi->sb, rw, |
104 | fio->type, io->bio); | |
76130cca | 105 | submit_bio(rw, io->bio); |
93dfe2ac | 106 | } else { |
940a6d34 GZ |
107 | trace_f2fs_submit_write_bio(io->sbi->sb, rw, |
108 | fio->type, io->bio); | |
109 | /* | |
110 | * META_FLUSH is only from the checkpoint procedure, and we | |
111 | * should wait this metadata bio for FS consistency. | |
112 | */ | |
113 | if (fio->type == META_FLUSH) { | |
114 | DECLARE_COMPLETION_ONSTACK(wait); | |
115 | io->bio->bi_private = &wait; | |
116 | submit_bio(rw, io->bio); | |
117 | wait_for_completion(&wait); | |
118 | } else { | |
119 | submit_bio(rw, io->bio); | |
120 | } | |
93dfe2ac | 121 | } |
940a6d34 | 122 | |
93dfe2ac JK |
123 | io->bio = NULL; |
124 | } | |
125 | ||
126 | void f2fs_submit_merged_bio(struct f2fs_sb_info *sbi, | |
458e6197 | 127 | enum page_type type, int rw) |
93dfe2ac JK |
128 | { |
129 | enum page_type btype = PAGE_TYPE_OF_BIO(type); | |
130 | struct f2fs_bio_info *io; | |
131 | ||
132 | io = is_read_io(rw) ? &sbi->read_io : &sbi->write_io[btype]; | |
133 | ||
134 | mutex_lock(&io->io_mutex); | |
458e6197 JK |
135 | |
136 | /* change META to META_FLUSH in the checkpoint procedure */ | |
137 | if (type >= META_FLUSH) { | |
138 | io->fio.type = META_FLUSH; | |
c434cbc0 | 139 | io->fio.rw = WRITE_FLUSH_FUA | REQ_META | REQ_PRIO; |
458e6197 JK |
140 | } |
141 | __submit_merged_bio(io); | |
93dfe2ac JK |
142 | mutex_unlock(&io->io_mutex); |
143 | } | |
144 | ||
145 | /* | |
146 | * Fill the locked page with data located in the block address. | |
147 | * Return unlocked page. | |
148 | */ | |
149 | int f2fs_submit_page_bio(struct f2fs_sb_info *sbi, struct page *page, | |
150 | block_t blk_addr, int rw) | |
151 | { | |
93dfe2ac JK |
152 | struct bio *bio; |
153 | ||
154 | trace_f2fs_submit_page_bio(page, blk_addr, rw); | |
155 | ||
156 | /* Allocate a new bio */ | |
940a6d34 | 157 | bio = __bio_alloc(sbi, blk_addr, 1, is_read_io(rw)); |
93dfe2ac JK |
158 | |
159 | if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) { | |
160 | bio_put(bio); | |
161 | f2fs_put_page(page, 1); | |
162 | return -EFAULT; | |
163 | } | |
164 | ||
165 | submit_bio(rw, bio); | |
166 | return 0; | |
167 | } | |
168 | ||
169 | void f2fs_submit_page_mbio(struct f2fs_sb_info *sbi, struct page *page, | |
458e6197 | 170 | block_t blk_addr, struct f2fs_io_info *fio) |
93dfe2ac | 171 | { |
458e6197 | 172 | enum page_type btype = PAGE_TYPE_OF_BIO(fio->type); |
93dfe2ac | 173 | struct f2fs_bio_info *io; |
940a6d34 | 174 | bool is_read = is_read_io(fio->rw); |
93dfe2ac | 175 | |
940a6d34 | 176 | io = is_read ? &sbi->read_io : &sbi->write_io[btype]; |
93dfe2ac JK |
177 | |
178 | verify_block_addr(sbi, blk_addr); | |
179 | ||
180 | mutex_lock(&io->io_mutex); | |
181 | ||
940a6d34 | 182 | if (!is_read) |
93dfe2ac JK |
183 | inc_page_count(sbi, F2FS_WRITEBACK); |
184 | ||
63a0b7cb | 185 | if (io->bio && (io->last_block_in_bio != blk_addr - 1 || |
458e6197 JK |
186 | io->fio.rw != fio->rw)) |
187 | __submit_merged_bio(io); | |
93dfe2ac JK |
188 | alloc_new: |
189 | if (io->bio == NULL) { | |
940a6d34 GZ |
190 | int bio_blocks = MAX_BIO_BLOCKS(max_hw_blocks(sbi)); |
191 | ||
192 | io->bio = __bio_alloc(sbi, blk_addr, bio_blocks, is_read); | |
458e6197 | 193 | io->fio = *fio; |
93dfe2ac JK |
194 | } |
195 | ||
196 | if (bio_add_page(io->bio, page, PAGE_CACHE_SIZE, 0) < | |
197 | PAGE_CACHE_SIZE) { | |
458e6197 | 198 | __submit_merged_bio(io); |
93dfe2ac JK |
199 | goto alloc_new; |
200 | } | |
201 | ||
202 | io->last_block_in_bio = blk_addr; | |
203 | ||
204 | mutex_unlock(&io->io_mutex); | |
458e6197 | 205 | trace_f2fs_submit_page_mbio(page, fio->rw, fio->type, blk_addr); |
93dfe2ac JK |
206 | } |
207 | ||
0a8165d7 | 208 | /* |
eb47b800 JK |
209 | * Lock ordering for the change of data block address: |
210 | * ->data_page | |
211 | * ->node_page | |
212 | * update block addresses in the node page | |
213 | */ | |
214 | static void __set_data_blkaddr(struct dnode_of_data *dn, block_t new_addr) | |
215 | { | |
216 | struct f2fs_node *rn; | |
217 | __le32 *addr_array; | |
218 | struct page *node_page = dn->node_page; | |
219 | unsigned int ofs_in_node = dn->ofs_in_node; | |
220 | ||
5514f0aa | 221 | f2fs_wait_on_page_writeback(node_page, NODE); |
eb47b800 | 222 | |
45590710 | 223 | rn = F2FS_NODE(node_page); |
eb47b800 JK |
224 | |
225 | /* Get physical address of data block */ | |
226 | addr_array = blkaddr_in_node(rn); | |
227 | addr_array[ofs_in_node] = cpu_to_le32(new_addr); | |
228 | set_page_dirty(node_page); | |
229 | } | |
230 | ||
231 | int reserve_new_block(struct dnode_of_data *dn) | |
232 | { | |
233 | struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb); | |
234 | ||
6bacf52f | 235 | if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC))) |
eb47b800 | 236 | return -EPERM; |
cfb271d4 | 237 | if (unlikely(!inc_valid_block_count(sbi, dn->inode, 1))) |
eb47b800 JK |
238 | return -ENOSPC; |
239 | ||
c01e2853 NJ |
240 | trace_f2fs_reserve_new_block(dn->inode, dn->nid, dn->ofs_in_node); |
241 | ||
eb47b800 JK |
242 | __set_data_blkaddr(dn, NEW_ADDR); |
243 | dn->data_blkaddr = NEW_ADDR; | |
a18ff063 | 244 | mark_inode_dirty(dn->inode); |
eb47b800 JK |
245 | sync_inode_page(dn); |
246 | return 0; | |
247 | } | |
248 | ||
b600965c HL |
249 | int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index) |
250 | { | |
251 | bool need_put = dn->inode_page ? false : true; | |
252 | int err; | |
253 | ||
a8865372 JK |
254 | /* if inode_page exists, index should be zero */ |
255 | f2fs_bug_on(!need_put && index); | |
256 | ||
b600965c HL |
257 | err = get_dnode_of_data(dn, index, ALLOC_NODE); |
258 | if (err) | |
259 | return err; | |
a8865372 | 260 | |
b600965c HL |
261 | if (dn->data_blkaddr == NULL_ADDR) |
262 | err = reserve_new_block(dn); | |
a8865372 | 263 | if (err || need_put) |
b600965c HL |
264 | f2fs_put_dnode(dn); |
265 | return err; | |
266 | } | |
267 | ||
eb47b800 JK |
268 | static int check_extent_cache(struct inode *inode, pgoff_t pgofs, |
269 | struct buffer_head *bh_result) | |
270 | { | |
271 | struct f2fs_inode_info *fi = F2FS_I(inode); | |
eb47b800 JK |
272 | pgoff_t start_fofs, end_fofs; |
273 | block_t start_blkaddr; | |
274 | ||
c11abd1a JK |
275 | if (is_inode_flag_set(fi, FI_NO_EXTENT)) |
276 | return 0; | |
277 | ||
eb47b800 JK |
278 | read_lock(&fi->ext.ext_lock); |
279 | if (fi->ext.len == 0) { | |
280 | read_unlock(&fi->ext.ext_lock); | |
281 | return 0; | |
282 | } | |
283 | ||
dcdfff65 JK |
284 | stat_inc_total_hit(inode->i_sb); |
285 | ||
eb47b800 JK |
286 | start_fofs = fi->ext.fofs; |
287 | end_fofs = fi->ext.fofs + fi->ext.len - 1; | |
288 | start_blkaddr = fi->ext.blk_addr; | |
289 | ||
290 | if (pgofs >= start_fofs && pgofs <= end_fofs) { | |
291 | unsigned int blkbits = inode->i_sb->s_blocksize_bits; | |
292 | size_t count; | |
293 | ||
294 | clear_buffer_new(bh_result); | |
295 | map_bh(bh_result, inode->i_sb, | |
296 | start_blkaddr + pgofs - start_fofs); | |
297 | count = end_fofs - pgofs + 1; | |
298 | if (count < (UINT_MAX >> blkbits)) | |
299 | bh_result->b_size = (count << blkbits); | |
300 | else | |
301 | bh_result->b_size = UINT_MAX; | |
302 | ||
dcdfff65 | 303 | stat_inc_read_hit(inode->i_sb); |
eb47b800 JK |
304 | read_unlock(&fi->ext.ext_lock); |
305 | return 1; | |
306 | } | |
307 | read_unlock(&fi->ext.ext_lock); | |
308 | return 0; | |
309 | } | |
310 | ||
311 | void update_extent_cache(block_t blk_addr, struct dnode_of_data *dn) | |
312 | { | |
313 | struct f2fs_inode_info *fi = F2FS_I(dn->inode); | |
314 | pgoff_t fofs, start_fofs, end_fofs; | |
315 | block_t start_blkaddr, end_blkaddr; | |
c11abd1a | 316 | int need_update = true; |
eb47b800 | 317 | |
5d56b671 | 318 | f2fs_bug_on(blk_addr == NEW_ADDR); |
de93653f JK |
319 | fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) + |
320 | dn->ofs_in_node; | |
eb47b800 JK |
321 | |
322 | /* Update the page address in the parent node */ | |
323 | __set_data_blkaddr(dn, blk_addr); | |
324 | ||
c11abd1a JK |
325 | if (is_inode_flag_set(fi, FI_NO_EXTENT)) |
326 | return; | |
327 | ||
eb47b800 JK |
328 | write_lock(&fi->ext.ext_lock); |
329 | ||
330 | start_fofs = fi->ext.fofs; | |
331 | end_fofs = fi->ext.fofs + fi->ext.len - 1; | |
332 | start_blkaddr = fi->ext.blk_addr; | |
333 | end_blkaddr = fi->ext.blk_addr + fi->ext.len - 1; | |
334 | ||
335 | /* Drop and initialize the matched extent */ | |
336 | if (fi->ext.len == 1 && fofs == start_fofs) | |
337 | fi->ext.len = 0; | |
338 | ||
339 | /* Initial extent */ | |
340 | if (fi->ext.len == 0) { | |
341 | if (blk_addr != NULL_ADDR) { | |
342 | fi->ext.fofs = fofs; | |
343 | fi->ext.blk_addr = blk_addr; | |
344 | fi->ext.len = 1; | |
345 | } | |
346 | goto end_update; | |
347 | } | |
348 | ||
6224da87 | 349 | /* Front merge */ |
eb47b800 JK |
350 | if (fofs == start_fofs - 1 && blk_addr == start_blkaddr - 1) { |
351 | fi->ext.fofs--; | |
352 | fi->ext.blk_addr--; | |
353 | fi->ext.len++; | |
354 | goto end_update; | |
355 | } | |
356 | ||
357 | /* Back merge */ | |
358 | if (fofs == end_fofs + 1 && blk_addr == end_blkaddr + 1) { | |
359 | fi->ext.len++; | |
360 | goto end_update; | |
361 | } | |
362 | ||
363 | /* Split the existing extent */ | |
364 | if (fi->ext.len > 1 && | |
365 | fofs >= start_fofs && fofs <= end_fofs) { | |
366 | if ((end_fofs - fofs) < (fi->ext.len >> 1)) { | |
367 | fi->ext.len = fofs - start_fofs; | |
368 | } else { | |
369 | fi->ext.fofs = fofs + 1; | |
370 | fi->ext.blk_addr = start_blkaddr + | |
371 | fofs - start_fofs + 1; | |
372 | fi->ext.len -= fofs - start_fofs + 1; | |
373 | } | |
c11abd1a JK |
374 | } else { |
375 | need_update = false; | |
eb47b800 | 376 | } |
eb47b800 | 377 | |
c11abd1a JK |
378 | /* Finally, if the extent is very fragmented, let's drop the cache. */ |
379 | if (fi->ext.len < F2FS_MIN_EXTENT_LEN) { | |
380 | fi->ext.len = 0; | |
381 | set_inode_flag(fi, FI_NO_EXTENT); | |
382 | need_update = true; | |
383 | } | |
eb47b800 JK |
384 | end_update: |
385 | write_unlock(&fi->ext.ext_lock); | |
c11abd1a JK |
386 | if (need_update) |
387 | sync_inode_page(dn); | |
388 | return; | |
eb47b800 JK |
389 | } |
390 | ||
c718379b | 391 | struct page *find_data_page(struct inode *inode, pgoff_t index, bool sync) |
eb47b800 JK |
392 | { |
393 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
394 | struct address_space *mapping = inode->i_mapping; | |
395 | struct dnode_of_data dn; | |
396 | struct page *page; | |
397 | int err; | |
398 | ||
399 | page = find_get_page(mapping, index); | |
400 | if (page && PageUptodate(page)) | |
401 | return page; | |
402 | f2fs_put_page(page, 0); | |
403 | ||
404 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 405 | err = get_dnode_of_data(&dn, index, LOOKUP_NODE); |
eb47b800 JK |
406 | if (err) |
407 | return ERR_PTR(err); | |
408 | f2fs_put_dnode(&dn); | |
409 | ||
410 | if (dn.data_blkaddr == NULL_ADDR) | |
411 | return ERR_PTR(-ENOENT); | |
412 | ||
413 | /* By fallocate(), there is no cached page, but with NEW_ADDR */ | |
6bacf52f | 414 | if (unlikely(dn.data_blkaddr == NEW_ADDR)) |
eb47b800 JK |
415 | return ERR_PTR(-EINVAL); |
416 | ||
6f85b352 | 417 | page = grab_cache_page_write_begin(mapping, index, AOP_FLAG_NOFS); |
eb47b800 JK |
418 | if (!page) |
419 | return ERR_PTR(-ENOMEM); | |
420 | ||
393ff91f JK |
421 | if (PageUptodate(page)) { |
422 | unlock_page(page); | |
423 | return page; | |
424 | } | |
425 | ||
93dfe2ac | 426 | err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr, |
c718379b | 427 | sync ? READ_SYNC : READA); |
1069bbf7 CY |
428 | if (err) |
429 | return ERR_PTR(err); | |
430 | ||
c718379b JK |
431 | if (sync) { |
432 | wait_on_page_locked(page); | |
6bacf52f | 433 | if (unlikely(!PageUptodate(page))) { |
c718379b JK |
434 | f2fs_put_page(page, 0); |
435 | return ERR_PTR(-EIO); | |
436 | } | |
eb47b800 | 437 | } |
eb47b800 JK |
438 | return page; |
439 | } | |
440 | ||
0a8165d7 | 441 | /* |
eb47b800 JK |
442 | * If it tries to access a hole, return an error. |
443 | * Because, the callers, functions in dir.c and GC, should be able to know | |
444 | * whether this page exists or not. | |
445 | */ | |
446 | struct page *get_lock_data_page(struct inode *inode, pgoff_t index) | |
447 | { | |
448 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
449 | struct address_space *mapping = inode->i_mapping; | |
450 | struct dnode_of_data dn; | |
451 | struct page *page; | |
452 | int err; | |
453 | ||
650495de | 454 | repeat: |
6f85b352 | 455 | page = grab_cache_page_write_begin(mapping, index, AOP_FLAG_NOFS); |
650495de JK |
456 | if (!page) |
457 | return ERR_PTR(-ENOMEM); | |
458 | ||
eb47b800 | 459 | set_new_dnode(&dn, inode, NULL, NULL, 0); |
266e97a8 | 460 | err = get_dnode_of_data(&dn, index, LOOKUP_NODE); |
650495de JK |
461 | if (err) { |
462 | f2fs_put_page(page, 1); | |
eb47b800 | 463 | return ERR_PTR(err); |
650495de | 464 | } |
eb47b800 JK |
465 | f2fs_put_dnode(&dn); |
466 | ||
6bacf52f | 467 | if (unlikely(dn.data_blkaddr == NULL_ADDR)) { |
650495de | 468 | f2fs_put_page(page, 1); |
eb47b800 | 469 | return ERR_PTR(-ENOENT); |
650495de | 470 | } |
eb47b800 JK |
471 | |
472 | if (PageUptodate(page)) | |
473 | return page; | |
474 | ||
d59ff4df JK |
475 | /* |
476 | * A new dentry page is allocated but not able to be written, since its | |
477 | * new inode page couldn't be allocated due to -ENOSPC. | |
478 | * In such the case, its blkaddr can be remained as NEW_ADDR. | |
479 | * see, f2fs_add_link -> get_new_data_page -> init_inode_metadata. | |
480 | */ | |
481 | if (dn.data_blkaddr == NEW_ADDR) { | |
482 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
483 | SetPageUptodate(page); | |
484 | return page; | |
485 | } | |
eb47b800 | 486 | |
93dfe2ac | 487 | err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr, READ_SYNC); |
393ff91f | 488 | if (err) |
eb47b800 | 489 | return ERR_PTR(err); |
393ff91f JK |
490 | |
491 | lock_page(page); | |
6bacf52f | 492 | if (unlikely(!PageUptodate(page))) { |
393ff91f JK |
493 | f2fs_put_page(page, 1); |
494 | return ERR_PTR(-EIO); | |
eb47b800 | 495 | } |
6bacf52f | 496 | if (unlikely(page->mapping != mapping)) { |
afcb7ca0 JK |
497 | f2fs_put_page(page, 1); |
498 | goto repeat; | |
eb47b800 JK |
499 | } |
500 | return page; | |
501 | } | |
502 | ||
0a8165d7 | 503 | /* |
eb47b800 JK |
504 | * Caller ensures that this data page is never allocated. |
505 | * A new zero-filled data page is allocated in the page cache. | |
39936837 | 506 | * |
4f4124d0 CY |
507 | * Also, caller should grab and release a rwsem by calling f2fs_lock_op() and |
508 | * f2fs_unlock_op(). | |
a8865372 | 509 | * Note that, ipage is set only by make_empty_dir. |
eb47b800 | 510 | */ |
64aa7ed9 | 511 | struct page *get_new_data_page(struct inode *inode, |
a8865372 | 512 | struct page *ipage, pgoff_t index, bool new_i_size) |
eb47b800 JK |
513 | { |
514 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
515 | struct address_space *mapping = inode->i_mapping; | |
516 | struct page *page; | |
517 | struct dnode_of_data dn; | |
518 | int err; | |
519 | ||
a8865372 | 520 | set_new_dnode(&dn, inode, ipage, NULL, 0); |
b600965c | 521 | err = f2fs_reserve_block(&dn, index); |
eb47b800 JK |
522 | if (err) |
523 | return ERR_PTR(err); | |
afcb7ca0 | 524 | repeat: |
eb47b800 | 525 | page = grab_cache_page(mapping, index); |
a8865372 JK |
526 | if (!page) { |
527 | err = -ENOMEM; | |
528 | goto put_err; | |
529 | } | |
eb47b800 JK |
530 | |
531 | if (PageUptodate(page)) | |
532 | return page; | |
533 | ||
534 | if (dn.data_blkaddr == NEW_ADDR) { | |
535 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
393ff91f | 536 | SetPageUptodate(page); |
eb47b800 | 537 | } else { |
93dfe2ac JK |
538 | err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr, |
539 | READ_SYNC); | |
393ff91f | 540 | if (err) |
a8865372 JK |
541 | goto put_err; |
542 | ||
393ff91f | 543 | lock_page(page); |
6bacf52f | 544 | if (unlikely(!PageUptodate(page))) { |
393ff91f | 545 | f2fs_put_page(page, 1); |
a8865372 JK |
546 | err = -EIO; |
547 | goto put_err; | |
eb47b800 | 548 | } |
6bacf52f | 549 | if (unlikely(page->mapping != mapping)) { |
afcb7ca0 JK |
550 | f2fs_put_page(page, 1); |
551 | goto repeat; | |
eb47b800 JK |
552 | } |
553 | } | |
eb47b800 JK |
554 | |
555 | if (new_i_size && | |
556 | i_size_read(inode) < ((index + 1) << PAGE_CACHE_SHIFT)) { | |
557 | i_size_write(inode, ((index + 1) << PAGE_CACHE_SHIFT)); | |
699489bb JK |
558 | /* Only the directory inode sets new_i_size */ |
559 | set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR); | |
eb47b800 JK |
560 | } |
561 | return page; | |
a8865372 JK |
562 | |
563 | put_err: | |
564 | f2fs_put_dnode(&dn); | |
565 | return ERR_PTR(err); | |
eb47b800 JK |
566 | } |
567 | ||
bfad7c2d JK |
568 | static int __allocate_data_block(struct dnode_of_data *dn) |
569 | { | |
570 | struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb); | |
571 | struct f2fs_summary sum; | |
572 | block_t new_blkaddr; | |
573 | struct node_info ni; | |
574 | int type; | |
575 | ||
576 | if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC))) | |
577 | return -EPERM; | |
578 | if (unlikely(!inc_valid_block_count(sbi, dn->inode, 1))) | |
579 | return -ENOSPC; | |
580 | ||
581 | __set_data_blkaddr(dn, NEW_ADDR); | |
582 | dn->data_blkaddr = NEW_ADDR; | |
583 | ||
584 | get_node_info(sbi, dn->nid, &ni); | |
585 | set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version); | |
586 | ||
587 | type = CURSEG_WARM_DATA; | |
588 | ||
589 | allocate_data_block(sbi, NULL, NULL_ADDR, &new_blkaddr, &sum, type); | |
590 | ||
591 | /* direct IO doesn't use extent cache to maximize the performance */ | |
592 | set_inode_flag(F2FS_I(dn->inode), FI_NO_EXTENT); | |
593 | update_extent_cache(new_blkaddr, dn); | |
594 | clear_inode_flag(F2FS_I(dn->inode), FI_NO_EXTENT); | |
595 | ||
596 | dn->data_blkaddr = new_blkaddr; | |
597 | return 0; | |
598 | } | |
599 | ||
0a8165d7 | 600 | /* |
4f4124d0 CY |
601 | * get_data_block() now supported readahead/bmap/rw direct_IO with mapped bh. |
602 | * If original data blocks are allocated, then give them to blockdev. | |
603 | * Otherwise, | |
604 | * a. preallocate requested block addresses | |
605 | * b. do not use extent cache for better performance | |
606 | * c. give the block addresses to blockdev | |
eb47b800 | 607 | */ |
bfad7c2d | 608 | static int get_data_block(struct inode *inode, sector_t iblock, |
eb47b800 JK |
609 | struct buffer_head *bh_result, int create) |
610 | { | |
bfad7c2d | 611 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); |
eb47b800 JK |
612 | unsigned int blkbits = inode->i_sb->s_blocksize_bits; |
613 | unsigned maxblocks = bh_result->b_size >> blkbits; | |
614 | struct dnode_of_data dn; | |
bfad7c2d JK |
615 | int mode = create ? ALLOC_NODE : LOOKUP_NODE_RA; |
616 | pgoff_t pgofs, end_offset; | |
617 | int err = 0, ofs = 1; | |
618 | bool allocated = false; | |
eb47b800 JK |
619 | |
620 | /* Get the page offset from the block offset(iblock) */ | |
621 | pgofs = (pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits)); | |
622 | ||
bfad7c2d JK |
623 | if (check_extent_cache(inode, pgofs, bh_result)) |
624 | goto out; | |
625 | ||
626 | if (create) | |
627 | f2fs_lock_op(sbi); | |
eb47b800 JK |
628 | |
629 | /* When reading holes, we need its node page */ | |
630 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
bfad7c2d | 631 | err = get_dnode_of_data(&dn, pgofs, mode); |
1ec79083 | 632 | if (err) { |
bfad7c2d JK |
633 | if (err == -ENOENT) |
634 | err = 0; | |
635 | goto unlock_out; | |
848753aa | 636 | } |
1ec79083 JK |
637 | if (dn.data_blkaddr == NEW_ADDR) |
638 | goto put_out; | |
eb47b800 | 639 | |
bfad7c2d JK |
640 | if (dn.data_blkaddr != NULL_ADDR) { |
641 | map_bh(bh_result, inode->i_sb, dn.data_blkaddr); | |
642 | } else if (create) { | |
643 | err = __allocate_data_block(&dn); | |
644 | if (err) | |
645 | goto put_out; | |
646 | allocated = true; | |
647 | map_bh(bh_result, inode->i_sb, dn.data_blkaddr); | |
648 | } else { | |
649 | goto put_out; | |
650 | } | |
651 | ||
652 | end_offset = IS_INODE(dn.node_page) ? | |
653 | ADDRS_PER_INODE(F2FS_I(inode)) : ADDRS_PER_BLOCK; | |
654 | bh_result->b_size = (((size_t)1) << blkbits); | |
655 | dn.ofs_in_node++; | |
656 | pgofs++; | |
657 | ||
658 | get_next: | |
659 | if (dn.ofs_in_node >= end_offset) { | |
660 | if (allocated) | |
661 | sync_inode_page(&dn); | |
662 | allocated = false; | |
663 | f2fs_put_dnode(&dn); | |
664 | ||
665 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
666 | err = get_dnode_of_data(&dn, pgofs, mode); | |
1ec79083 | 667 | if (err) { |
bfad7c2d JK |
668 | if (err == -ENOENT) |
669 | err = 0; | |
670 | goto unlock_out; | |
671 | } | |
1ec79083 JK |
672 | if (dn.data_blkaddr == NEW_ADDR) |
673 | goto put_out; | |
674 | ||
eb47b800 | 675 | end_offset = IS_INODE(dn.node_page) ? |
bfad7c2d JK |
676 | ADDRS_PER_INODE(F2FS_I(inode)) : ADDRS_PER_BLOCK; |
677 | } | |
eb47b800 | 678 | |
bfad7c2d JK |
679 | if (maxblocks > (bh_result->b_size >> blkbits)) { |
680 | block_t blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node); | |
681 | if (blkaddr == NULL_ADDR && create) { | |
682 | err = __allocate_data_block(&dn); | |
683 | if (err) | |
684 | goto sync_out; | |
685 | allocated = true; | |
686 | blkaddr = dn.data_blkaddr; | |
687 | } | |
eb47b800 | 688 | /* Give more consecutive addresses for the read ahead */ |
bfad7c2d JK |
689 | if (blkaddr == (bh_result->b_blocknr + ofs)) { |
690 | ofs++; | |
691 | dn.ofs_in_node++; | |
692 | pgofs++; | |
693 | bh_result->b_size += (((size_t)1) << blkbits); | |
694 | goto get_next; | |
695 | } | |
eb47b800 | 696 | } |
bfad7c2d JK |
697 | sync_out: |
698 | if (allocated) | |
699 | sync_inode_page(&dn); | |
700 | put_out: | |
eb47b800 | 701 | f2fs_put_dnode(&dn); |
bfad7c2d JK |
702 | unlock_out: |
703 | if (create) | |
704 | f2fs_unlock_op(sbi); | |
705 | out: | |
706 | trace_f2fs_get_data_block(inode, iblock, bh_result, err); | |
707 | return err; | |
eb47b800 JK |
708 | } |
709 | ||
710 | static int f2fs_read_data_page(struct file *file, struct page *page) | |
711 | { | |
9ffe0fb5 HL |
712 | struct inode *inode = page->mapping->host; |
713 | int ret; | |
714 | ||
715 | /* If the file has inline data, try to read it directlly */ | |
716 | if (f2fs_has_inline_data(inode)) | |
717 | ret = f2fs_read_inline_data(inode, page); | |
718 | else | |
719 | ret = mpage_readpage(page, get_data_block); | |
720 | ||
721 | return ret; | |
eb47b800 JK |
722 | } |
723 | ||
724 | static int f2fs_read_data_pages(struct file *file, | |
725 | struct address_space *mapping, | |
726 | struct list_head *pages, unsigned nr_pages) | |
727 | { | |
9ffe0fb5 HL |
728 | struct inode *inode = file->f_mapping->host; |
729 | ||
730 | /* If the file has inline data, skip readpages */ | |
731 | if (f2fs_has_inline_data(inode)) | |
732 | return 0; | |
733 | ||
bfad7c2d | 734 | return mpage_readpages(mapping, pages, nr_pages, get_data_block); |
eb47b800 JK |
735 | } |
736 | ||
458e6197 | 737 | int do_write_data_page(struct page *page, struct f2fs_io_info *fio) |
eb47b800 JK |
738 | { |
739 | struct inode *inode = page->mapping->host; | |
458e6197 | 740 | block_t old_blkaddr, new_blkaddr; |
eb47b800 JK |
741 | struct dnode_of_data dn; |
742 | int err = 0; | |
743 | ||
744 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 745 | err = get_dnode_of_data(&dn, page->index, LOOKUP_NODE); |
eb47b800 JK |
746 | if (err) |
747 | return err; | |
748 | ||
458e6197 | 749 | old_blkaddr = dn.data_blkaddr; |
eb47b800 JK |
750 | |
751 | /* This page is already truncated */ | |
458e6197 | 752 | if (old_blkaddr == NULL_ADDR) |
eb47b800 JK |
753 | goto out_writepage; |
754 | ||
755 | set_page_writeback(page); | |
756 | ||
757 | /* | |
758 | * If current allocation needs SSR, | |
759 | * it had better in-place writes for updated data. | |
760 | */ | |
458e6197 | 761 | if (unlikely(old_blkaddr != NEW_ADDR && |
b25958b6 HL |
762 | !is_cold_data(page) && |
763 | need_inplace_update(inode))) { | |
458e6197 | 764 | rewrite_data_page(page, old_blkaddr, fio); |
eb47b800 | 765 | } else { |
458e6197 JK |
766 | write_data_page(page, &dn, &new_blkaddr, fio); |
767 | update_extent_cache(new_blkaddr, &dn); | |
eb47b800 JK |
768 | } |
769 | out_writepage: | |
770 | f2fs_put_dnode(&dn); | |
771 | return err; | |
772 | } | |
773 | ||
774 | static int f2fs_write_data_page(struct page *page, | |
775 | struct writeback_control *wbc) | |
776 | { | |
777 | struct inode *inode = page->mapping->host; | |
778 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
779 | loff_t i_size = i_size_read(inode); | |
780 | const pgoff_t end_index = ((unsigned long long) i_size) | |
781 | >> PAGE_CACHE_SHIFT; | |
9ffe0fb5 | 782 | unsigned offset = 0; |
39936837 | 783 | bool need_balance_fs = false; |
eb47b800 | 784 | int err = 0; |
458e6197 JK |
785 | struct f2fs_io_info fio = { |
786 | .type = DATA, | |
6c311ec6 | 787 | .rw = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : WRITE, |
458e6197 | 788 | }; |
eb47b800 JK |
789 | |
790 | if (page->index < end_index) | |
39936837 | 791 | goto write; |
eb47b800 JK |
792 | |
793 | /* | |
794 | * If the offset is out-of-range of file size, | |
795 | * this page does not have to be written to disk. | |
796 | */ | |
797 | offset = i_size & (PAGE_CACHE_SIZE - 1); | |
798 | if ((page->index >= end_index + 1) || !offset) { | |
799 | if (S_ISDIR(inode->i_mode)) { | |
800 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
801 | inode_dec_dirty_dents(inode); | |
802 | } | |
39936837 | 803 | goto out; |
eb47b800 JK |
804 | } |
805 | ||
806 | zero_user_segment(page, offset, PAGE_CACHE_SIZE); | |
39936837 | 807 | write: |
cfb271d4 | 808 | if (unlikely(sbi->por_doing)) { |
39936837 | 809 | err = AOP_WRITEPAGE_ACTIVATE; |
eb47b800 | 810 | goto redirty_out; |
39936837 | 811 | } |
eb47b800 | 812 | |
39936837 | 813 | /* Dentry blocks are controlled by checkpoint */ |
eb47b800 JK |
814 | if (S_ISDIR(inode->i_mode)) { |
815 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
816 | inode_dec_dirty_dents(inode); | |
458e6197 | 817 | err = do_write_data_page(page, &fio); |
39936837 | 818 | } else { |
e479556b | 819 | f2fs_lock_op(sbi); |
9ffe0fb5 HL |
820 | |
821 | if (f2fs_has_inline_data(inode) || f2fs_may_inline(inode)) { | |
822 | err = f2fs_write_inline_data(inode, page, offset); | |
823 | f2fs_unlock_op(sbi); | |
824 | goto out; | |
825 | } else { | |
826 | err = do_write_data_page(page, &fio); | |
827 | } | |
828 | ||
e479556b | 829 | f2fs_unlock_op(sbi); |
39936837 | 830 | need_balance_fs = true; |
eb47b800 | 831 | } |
39936837 JK |
832 | if (err == -ENOENT) |
833 | goto out; | |
834 | else if (err) | |
835 | goto redirty_out; | |
eb47b800 | 836 | |
c33ec326 | 837 | if (wbc->for_reclaim) { |
458e6197 | 838 | f2fs_submit_merged_bio(sbi, DATA, WRITE); |
c33ec326 JK |
839 | need_balance_fs = false; |
840 | } | |
eb47b800 | 841 | |
eb47b800 | 842 | clear_cold_data(page); |
39936837 | 843 | out: |
eb47b800 | 844 | unlock_page(page); |
39936837 | 845 | if (need_balance_fs) |
eb47b800 JK |
846 | f2fs_balance_fs(sbi); |
847 | return 0; | |
848 | ||
eb47b800 JK |
849 | redirty_out: |
850 | wbc->pages_skipped++; | |
851 | set_page_dirty(page); | |
39936837 | 852 | return err; |
eb47b800 JK |
853 | } |
854 | ||
855 | #define MAX_DESIRED_PAGES_WP 4096 | |
856 | ||
fa9150a8 NJ |
857 | static int __f2fs_writepage(struct page *page, struct writeback_control *wbc, |
858 | void *data) | |
859 | { | |
860 | struct address_space *mapping = data; | |
861 | int ret = mapping->a_ops->writepage(page, wbc); | |
862 | mapping_set_error(mapping, ret); | |
863 | return ret; | |
864 | } | |
865 | ||
25ca923b | 866 | static int f2fs_write_data_pages(struct address_space *mapping, |
eb47b800 JK |
867 | struct writeback_control *wbc) |
868 | { | |
869 | struct inode *inode = mapping->host; | |
870 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
531ad7d5 | 871 | bool locked = false; |
eb47b800 JK |
872 | int ret; |
873 | long excess_nrtw = 0, desired_nrtw; | |
874 | ||
cfb185a1 | 875 | /* deal with chardevs and other special file */ |
876 | if (!mapping->a_ops->writepage) | |
877 | return 0; | |
878 | ||
eb47b800 JK |
879 | if (wbc->nr_to_write < MAX_DESIRED_PAGES_WP) { |
880 | desired_nrtw = MAX_DESIRED_PAGES_WP; | |
881 | excess_nrtw = desired_nrtw - wbc->nr_to_write; | |
882 | wbc->nr_to_write = desired_nrtw; | |
883 | } | |
884 | ||
531ad7d5 | 885 | if (!S_ISDIR(inode->i_mode)) { |
eb47b800 | 886 | mutex_lock(&sbi->writepages); |
531ad7d5 JK |
887 | locked = true; |
888 | } | |
fa9150a8 | 889 | ret = write_cache_pages(mapping, wbc, __f2fs_writepage, mapping); |
531ad7d5 | 890 | if (locked) |
eb47b800 | 891 | mutex_unlock(&sbi->writepages); |
458e6197 JK |
892 | |
893 | f2fs_submit_merged_bio(sbi, DATA, WRITE); | |
eb47b800 JK |
894 | |
895 | remove_dirty_dir_inode(inode); | |
896 | ||
897 | wbc->nr_to_write -= excess_nrtw; | |
898 | return ret; | |
899 | } | |
900 | ||
901 | static int f2fs_write_begin(struct file *file, struct address_space *mapping, | |
902 | loff_t pos, unsigned len, unsigned flags, | |
903 | struct page **pagep, void **fsdata) | |
904 | { | |
905 | struct inode *inode = mapping->host; | |
906 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
907 | struct page *page; | |
908 | pgoff_t index = ((unsigned long long) pos) >> PAGE_CACHE_SHIFT; | |
909 | struct dnode_of_data dn; | |
910 | int err = 0; | |
911 | ||
eb47b800 | 912 | f2fs_balance_fs(sbi); |
afcb7ca0 | 913 | repeat: |
9e09fc85 JK |
914 | err = f2fs_convert_inline_data(inode, pos + len); |
915 | if (err) | |
916 | return err; | |
917 | ||
eb47b800 JK |
918 | page = grab_cache_page_write_begin(mapping, index, flags); |
919 | if (!page) | |
920 | return -ENOMEM; | |
921 | *pagep = page; | |
922 | ||
9e09fc85 JK |
923 | if (f2fs_has_inline_data(inode) && (pos + len) <= MAX_INLINE_DATA) |
924 | goto inline_data; | |
9ffe0fb5 | 925 | |
e479556b | 926 | f2fs_lock_op(sbi); |
eb47b800 | 927 | set_new_dnode(&dn, inode, NULL, NULL, 0); |
b600965c | 928 | err = f2fs_reserve_block(&dn, index); |
e479556b | 929 | f2fs_unlock_op(sbi); |
eb47b800 | 930 | |
b600965c HL |
931 | if (err) { |
932 | f2fs_put_page(page, 1); | |
933 | return err; | |
934 | } | |
9ffe0fb5 | 935 | inline_data: |
eb47b800 JK |
936 | if ((len == PAGE_CACHE_SIZE) || PageUptodate(page)) |
937 | return 0; | |
938 | ||
939 | if ((pos & PAGE_CACHE_MASK) >= i_size_read(inode)) { | |
940 | unsigned start = pos & (PAGE_CACHE_SIZE - 1); | |
941 | unsigned end = start + len; | |
942 | ||
943 | /* Reading beyond i_size is simple: memset to zero */ | |
944 | zero_user_segments(page, 0, start, end, PAGE_CACHE_SIZE); | |
393ff91f | 945 | goto out; |
eb47b800 JK |
946 | } |
947 | ||
948 | if (dn.data_blkaddr == NEW_ADDR) { | |
949 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
950 | } else { | |
9ffe0fb5 HL |
951 | if (f2fs_has_inline_data(inode)) |
952 | err = f2fs_read_inline_data(inode, page); | |
953 | else | |
954 | err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr, | |
93dfe2ac | 955 | READ_SYNC); |
393ff91f | 956 | if (err) |
eb47b800 | 957 | return err; |
393ff91f | 958 | lock_page(page); |
6bacf52f | 959 | if (unlikely(!PageUptodate(page))) { |
393ff91f JK |
960 | f2fs_put_page(page, 1); |
961 | return -EIO; | |
eb47b800 | 962 | } |
6bacf52f | 963 | if (unlikely(page->mapping != mapping)) { |
afcb7ca0 JK |
964 | f2fs_put_page(page, 1); |
965 | goto repeat; | |
eb47b800 JK |
966 | } |
967 | } | |
393ff91f | 968 | out: |
eb47b800 JK |
969 | SetPageUptodate(page); |
970 | clear_cold_data(page); | |
971 | return 0; | |
972 | } | |
973 | ||
a1dd3c13 JK |
974 | static int f2fs_write_end(struct file *file, |
975 | struct address_space *mapping, | |
976 | loff_t pos, unsigned len, unsigned copied, | |
977 | struct page *page, void *fsdata) | |
978 | { | |
979 | struct inode *inode = page->mapping->host; | |
980 | ||
981 | SetPageUptodate(page); | |
982 | set_page_dirty(page); | |
983 | ||
984 | if (pos + copied > i_size_read(inode)) { | |
985 | i_size_write(inode, pos + copied); | |
986 | mark_inode_dirty(inode); | |
987 | update_inode_page(inode); | |
988 | } | |
989 | ||
75c3c8bc | 990 | f2fs_put_page(page, 1); |
a1dd3c13 JK |
991 | return copied; |
992 | } | |
993 | ||
944fcfc1 JK |
994 | static int check_direct_IO(struct inode *inode, int rw, |
995 | const struct iovec *iov, loff_t offset, unsigned long nr_segs) | |
996 | { | |
997 | unsigned blocksize_mask = inode->i_sb->s_blocksize - 1; | |
998 | int i; | |
999 | ||
1000 | if (rw == READ) | |
1001 | return 0; | |
1002 | ||
1003 | if (offset & blocksize_mask) | |
1004 | return -EINVAL; | |
1005 | ||
1006 | for (i = 0; i < nr_segs; i++) | |
1007 | if (iov[i].iov_len & blocksize_mask) | |
1008 | return -EINVAL; | |
1009 | return 0; | |
1010 | } | |
1011 | ||
eb47b800 JK |
1012 | static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb, |
1013 | const struct iovec *iov, loff_t offset, unsigned long nr_segs) | |
1014 | { | |
1015 | struct file *file = iocb->ki_filp; | |
1016 | struct inode *inode = file->f_mapping->host; | |
944fcfc1 | 1017 | |
9ffe0fb5 HL |
1018 | /* Let buffer I/O handle the inline data case. */ |
1019 | if (f2fs_has_inline_data(inode)) | |
1020 | return 0; | |
1021 | ||
944fcfc1 JK |
1022 | if (check_direct_IO(inode, rw, iov, offset, nr_segs)) |
1023 | return 0; | |
1024 | ||
eb47b800 | 1025 | return blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs, |
bfad7c2d | 1026 | get_data_block); |
eb47b800 JK |
1027 | } |
1028 | ||
d47992f8 LC |
1029 | static void f2fs_invalidate_data_page(struct page *page, unsigned int offset, |
1030 | unsigned int length) | |
eb47b800 JK |
1031 | { |
1032 | struct inode *inode = page->mapping->host; | |
1033 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
1034 | if (S_ISDIR(inode->i_mode) && PageDirty(page)) { | |
1035 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
1036 | inode_dec_dirty_dents(inode); | |
1037 | } | |
1038 | ClearPagePrivate(page); | |
1039 | } | |
1040 | ||
1041 | static int f2fs_release_data_page(struct page *page, gfp_t wait) | |
1042 | { | |
1043 | ClearPagePrivate(page); | |
c3850aa1 | 1044 | return 1; |
eb47b800 JK |
1045 | } |
1046 | ||
1047 | static int f2fs_set_data_page_dirty(struct page *page) | |
1048 | { | |
1049 | struct address_space *mapping = page->mapping; | |
1050 | struct inode *inode = mapping->host; | |
1051 | ||
26c6b887 JK |
1052 | trace_f2fs_set_page_dirty(page, DATA); |
1053 | ||
eb47b800 | 1054 | SetPageUptodate(page); |
a18ff063 JK |
1055 | mark_inode_dirty(inode); |
1056 | ||
eb47b800 JK |
1057 | if (!PageDirty(page)) { |
1058 | __set_page_dirty_nobuffers(page); | |
1059 | set_dirty_dir_page(inode, page); | |
1060 | return 1; | |
1061 | } | |
1062 | return 0; | |
1063 | } | |
1064 | ||
c01e54b7 JK |
1065 | static sector_t f2fs_bmap(struct address_space *mapping, sector_t block) |
1066 | { | |
bfad7c2d | 1067 | return generic_block_bmap(mapping, block, get_data_block); |
c01e54b7 JK |
1068 | } |
1069 | ||
eb47b800 JK |
1070 | const struct address_space_operations f2fs_dblock_aops = { |
1071 | .readpage = f2fs_read_data_page, | |
1072 | .readpages = f2fs_read_data_pages, | |
1073 | .writepage = f2fs_write_data_page, | |
1074 | .writepages = f2fs_write_data_pages, | |
1075 | .write_begin = f2fs_write_begin, | |
a1dd3c13 | 1076 | .write_end = f2fs_write_end, |
eb47b800 JK |
1077 | .set_page_dirty = f2fs_set_data_page_dirty, |
1078 | .invalidatepage = f2fs_invalidate_data_page, | |
1079 | .releasepage = f2fs_release_data_page, | |
1080 | .direct_IO = f2fs_direct_IO, | |
c01e54b7 | 1081 | .bmap = f2fs_bmap, |
eb47b800 | 1082 | }; |