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 | { | |
1b1f559f | 48 | struct f2fs_sb_info *sbi = bio->bi_private; |
f568849e LT |
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)) { |
cf779cab | 56 | set_page_dirty(page); |
93dfe2ac | 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 | 63 | |
1b1f559f JK |
64 | if (sbi->wait_io) { |
65 | complete(sbi->wait_io); | |
66 | sbi->wait_io = NULL; | |
67 | } | |
93dfe2ac JK |
68 | |
69 | if (!get_pages(sbi, F2FS_WRITEBACK) && | |
70 | !list_empty(&sbi->cp_wait.task_list)) | |
71 | wake_up(&sbi->cp_wait); | |
72 | ||
73 | bio_put(bio); | |
74 | } | |
75 | ||
940a6d34 GZ |
76 | /* |
77 | * Low-level block read/write IO operations. | |
78 | */ | |
79 | static struct bio *__bio_alloc(struct f2fs_sb_info *sbi, block_t blk_addr, | |
80 | int npages, bool is_read) | |
81 | { | |
82 | struct bio *bio; | |
83 | ||
84 | /* No failure on bio allocation */ | |
85 | bio = bio_alloc(GFP_NOIO, npages); | |
86 | ||
87 | bio->bi_bdev = sbi->sb->s_bdev; | |
55cf9cb6 | 88 | bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(blk_addr); |
940a6d34 | 89 | bio->bi_end_io = is_read ? f2fs_read_end_io : f2fs_write_end_io; |
1b1f559f | 90 | bio->bi_private = sbi; |
940a6d34 GZ |
91 | |
92 | return bio; | |
93 | } | |
94 | ||
458e6197 | 95 | static void __submit_merged_bio(struct f2fs_bio_info *io) |
93dfe2ac | 96 | { |
458e6197 JK |
97 | struct f2fs_io_info *fio = &io->fio; |
98 | int rw; | |
93dfe2ac JK |
99 | |
100 | if (!io->bio) | |
101 | return; | |
102 | ||
7e8f2308 | 103 | rw = fio->rw; |
93dfe2ac JK |
104 | |
105 | if (is_read_io(rw)) { | |
940a6d34 GZ |
106 | trace_f2fs_submit_read_bio(io->sbi->sb, rw, |
107 | fio->type, io->bio); | |
76130cca | 108 | submit_bio(rw, io->bio); |
93dfe2ac | 109 | } else { |
940a6d34 GZ |
110 | trace_f2fs_submit_write_bio(io->sbi->sb, rw, |
111 | fio->type, io->bio); | |
112 | /* | |
113 | * META_FLUSH is only from the checkpoint procedure, and we | |
114 | * should wait this metadata bio for FS consistency. | |
115 | */ | |
116 | if (fio->type == META_FLUSH) { | |
117 | DECLARE_COMPLETION_ONSTACK(wait); | |
1b1f559f | 118 | io->sbi->wait_io = &wait; |
940a6d34 GZ |
119 | submit_bio(rw, io->bio); |
120 | wait_for_completion(&wait); | |
121 | } else { | |
122 | submit_bio(rw, io->bio); | |
123 | } | |
93dfe2ac | 124 | } |
940a6d34 | 125 | |
93dfe2ac JK |
126 | io->bio = NULL; |
127 | } | |
128 | ||
129 | void f2fs_submit_merged_bio(struct f2fs_sb_info *sbi, | |
458e6197 | 130 | enum page_type type, int rw) |
93dfe2ac JK |
131 | { |
132 | enum page_type btype = PAGE_TYPE_OF_BIO(type); | |
133 | struct f2fs_bio_info *io; | |
134 | ||
135 | io = is_read_io(rw) ? &sbi->read_io : &sbi->write_io[btype]; | |
136 | ||
df0f8dc0 | 137 | down_write(&io->io_rwsem); |
458e6197 JK |
138 | |
139 | /* change META to META_FLUSH in the checkpoint procedure */ | |
140 | if (type >= META_FLUSH) { | |
141 | io->fio.type = META_FLUSH; | |
0f7b2abd JK |
142 | if (test_opt(sbi, NOBARRIER)) |
143 | io->fio.rw = WRITE_FLUSH | REQ_META | REQ_PRIO; | |
144 | else | |
145 | io->fio.rw = WRITE_FLUSH_FUA | REQ_META | REQ_PRIO; | |
458e6197 JK |
146 | } |
147 | __submit_merged_bio(io); | |
df0f8dc0 | 148 | up_write(&io->io_rwsem); |
93dfe2ac JK |
149 | } |
150 | ||
151 | /* | |
152 | * Fill the locked page with data located in the block address. | |
153 | * Return unlocked page. | |
154 | */ | |
155 | int f2fs_submit_page_bio(struct f2fs_sb_info *sbi, struct page *page, | |
156 | block_t blk_addr, int rw) | |
157 | { | |
93dfe2ac JK |
158 | struct bio *bio; |
159 | ||
160 | trace_f2fs_submit_page_bio(page, blk_addr, rw); | |
161 | ||
162 | /* Allocate a new bio */ | |
940a6d34 | 163 | bio = __bio_alloc(sbi, blk_addr, 1, is_read_io(rw)); |
93dfe2ac JK |
164 | |
165 | if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) { | |
166 | bio_put(bio); | |
167 | f2fs_put_page(page, 1); | |
168 | return -EFAULT; | |
169 | } | |
170 | ||
171 | submit_bio(rw, bio); | |
172 | return 0; | |
173 | } | |
174 | ||
175 | void f2fs_submit_page_mbio(struct f2fs_sb_info *sbi, struct page *page, | |
458e6197 | 176 | block_t blk_addr, struct f2fs_io_info *fio) |
93dfe2ac | 177 | { |
458e6197 | 178 | enum page_type btype = PAGE_TYPE_OF_BIO(fio->type); |
93dfe2ac | 179 | struct f2fs_bio_info *io; |
940a6d34 | 180 | bool is_read = is_read_io(fio->rw); |
93dfe2ac | 181 | |
940a6d34 | 182 | io = is_read ? &sbi->read_io : &sbi->write_io[btype]; |
93dfe2ac JK |
183 | |
184 | verify_block_addr(sbi, blk_addr); | |
185 | ||
df0f8dc0 | 186 | down_write(&io->io_rwsem); |
93dfe2ac | 187 | |
940a6d34 | 188 | if (!is_read) |
93dfe2ac JK |
189 | inc_page_count(sbi, F2FS_WRITEBACK); |
190 | ||
63a0b7cb | 191 | if (io->bio && (io->last_block_in_bio != blk_addr - 1 || |
458e6197 JK |
192 | io->fio.rw != fio->rw)) |
193 | __submit_merged_bio(io); | |
93dfe2ac JK |
194 | alloc_new: |
195 | if (io->bio == NULL) { | |
90a893c7 | 196 | int bio_blocks = MAX_BIO_BLOCKS(sbi); |
940a6d34 GZ |
197 | |
198 | io->bio = __bio_alloc(sbi, blk_addr, bio_blocks, is_read); | |
458e6197 | 199 | io->fio = *fio; |
93dfe2ac JK |
200 | } |
201 | ||
202 | if (bio_add_page(io->bio, page, PAGE_CACHE_SIZE, 0) < | |
203 | PAGE_CACHE_SIZE) { | |
458e6197 | 204 | __submit_merged_bio(io); |
93dfe2ac JK |
205 | goto alloc_new; |
206 | } | |
207 | ||
208 | io->last_block_in_bio = blk_addr; | |
209 | ||
df0f8dc0 | 210 | up_write(&io->io_rwsem); |
458e6197 | 211 | trace_f2fs_submit_page_mbio(page, fio->rw, fio->type, blk_addr); |
93dfe2ac JK |
212 | } |
213 | ||
0a8165d7 | 214 | /* |
eb47b800 JK |
215 | * Lock ordering for the change of data block address: |
216 | * ->data_page | |
217 | * ->node_page | |
218 | * update block addresses in the node page | |
219 | */ | |
220 | static void __set_data_blkaddr(struct dnode_of_data *dn, block_t new_addr) | |
221 | { | |
222 | struct f2fs_node *rn; | |
223 | __le32 *addr_array; | |
224 | struct page *node_page = dn->node_page; | |
225 | unsigned int ofs_in_node = dn->ofs_in_node; | |
226 | ||
5514f0aa | 227 | f2fs_wait_on_page_writeback(node_page, NODE); |
eb47b800 | 228 | |
45590710 | 229 | rn = F2FS_NODE(node_page); |
eb47b800 JK |
230 | |
231 | /* Get physical address of data block */ | |
232 | addr_array = blkaddr_in_node(rn); | |
233 | addr_array[ofs_in_node] = cpu_to_le32(new_addr); | |
234 | set_page_dirty(node_page); | |
235 | } | |
236 | ||
237 | int reserve_new_block(struct dnode_of_data *dn) | |
238 | { | |
4081363f | 239 | struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode); |
eb47b800 | 240 | |
6bacf52f | 241 | if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC))) |
eb47b800 | 242 | return -EPERM; |
cfb271d4 | 243 | if (unlikely(!inc_valid_block_count(sbi, dn->inode, 1))) |
eb47b800 JK |
244 | return -ENOSPC; |
245 | ||
c01e2853 NJ |
246 | trace_f2fs_reserve_new_block(dn->inode, dn->nid, dn->ofs_in_node); |
247 | ||
eb47b800 JK |
248 | __set_data_blkaddr(dn, NEW_ADDR); |
249 | dn->data_blkaddr = NEW_ADDR; | |
a18ff063 | 250 | mark_inode_dirty(dn->inode); |
eb47b800 JK |
251 | sync_inode_page(dn); |
252 | return 0; | |
253 | } | |
254 | ||
b600965c HL |
255 | int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index) |
256 | { | |
257 | bool need_put = dn->inode_page ? false : true; | |
258 | int err; | |
259 | ||
a8865372 | 260 | /* if inode_page exists, index should be zero */ |
9850cf4a | 261 | f2fs_bug_on(F2FS_I_SB(dn->inode), !need_put && index); |
a8865372 | 262 | |
b600965c HL |
263 | err = get_dnode_of_data(dn, index, ALLOC_NODE); |
264 | if (err) | |
265 | return err; | |
a8865372 | 266 | |
b600965c HL |
267 | if (dn->data_blkaddr == NULL_ADDR) |
268 | err = reserve_new_block(dn); | |
a8865372 | 269 | if (err || need_put) |
b600965c HL |
270 | f2fs_put_dnode(dn); |
271 | return err; | |
272 | } | |
273 | ||
eb47b800 JK |
274 | static int check_extent_cache(struct inode *inode, pgoff_t pgofs, |
275 | struct buffer_head *bh_result) | |
276 | { | |
277 | struct f2fs_inode_info *fi = F2FS_I(inode); | |
eb47b800 JK |
278 | pgoff_t start_fofs, end_fofs; |
279 | block_t start_blkaddr; | |
280 | ||
c11abd1a JK |
281 | if (is_inode_flag_set(fi, FI_NO_EXTENT)) |
282 | return 0; | |
283 | ||
eb47b800 JK |
284 | read_lock(&fi->ext.ext_lock); |
285 | if (fi->ext.len == 0) { | |
286 | read_unlock(&fi->ext.ext_lock); | |
287 | return 0; | |
288 | } | |
289 | ||
dcdfff65 JK |
290 | stat_inc_total_hit(inode->i_sb); |
291 | ||
eb47b800 JK |
292 | start_fofs = fi->ext.fofs; |
293 | end_fofs = fi->ext.fofs + fi->ext.len - 1; | |
294 | start_blkaddr = fi->ext.blk_addr; | |
295 | ||
296 | if (pgofs >= start_fofs && pgofs <= end_fofs) { | |
297 | unsigned int blkbits = inode->i_sb->s_blocksize_bits; | |
298 | size_t count; | |
299 | ||
300 | clear_buffer_new(bh_result); | |
301 | map_bh(bh_result, inode->i_sb, | |
302 | start_blkaddr + pgofs - start_fofs); | |
303 | count = end_fofs - pgofs + 1; | |
304 | if (count < (UINT_MAX >> blkbits)) | |
305 | bh_result->b_size = (count << blkbits); | |
306 | else | |
307 | bh_result->b_size = UINT_MAX; | |
308 | ||
dcdfff65 | 309 | stat_inc_read_hit(inode->i_sb); |
eb47b800 JK |
310 | read_unlock(&fi->ext.ext_lock); |
311 | return 1; | |
312 | } | |
313 | read_unlock(&fi->ext.ext_lock); | |
314 | return 0; | |
315 | } | |
316 | ||
317 | void update_extent_cache(block_t blk_addr, struct dnode_of_data *dn) | |
318 | { | |
319 | struct f2fs_inode_info *fi = F2FS_I(dn->inode); | |
320 | pgoff_t fofs, start_fofs, end_fofs; | |
321 | block_t start_blkaddr, end_blkaddr; | |
c11abd1a | 322 | int need_update = true; |
eb47b800 | 323 | |
9850cf4a | 324 | f2fs_bug_on(F2FS_I_SB(dn->inode), blk_addr == NEW_ADDR); |
de93653f JK |
325 | fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) + |
326 | dn->ofs_in_node; | |
eb47b800 JK |
327 | |
328 | /* Update the page address in the parent node */ | |
329 | __set_data_blkaddr(dn, blk_addr); | |
330 | ||
c11abd1a JK |
331 | if (is_inode_flag_set(fi, FI_NO_EXTENT)) |
332 | return; | |
333 | ||
eb47b800 JK |
334 | write_lock(&fi->ext.ext_lock); |
335 | ||
336 | start_fofs = fi->ext.fofs; | |
337 | end_fofs = fi->ext.fofs + fi->ext.len - 1; | |
338 | start_blkaddr = fi->ext.blk_addr; | |
339 | end_blkaddr = fi->ext.blk_addr + fi->ext.len - 1; | |
340 | ||
341 | /* Drop and initialize the matched extent */ | |
342 | if (fi->ext.len == 1 && fofs == start_fofs) | |
343 | fi->ext.len = 0; | |
344 | ||
345 | /* Initial extent */ | |
346 | if (fi->ext.len == 0) { | |
347 | if (blk_addr != NULL_ADDR) { | |
348 | fi->ext.fofs = fofs; | |
349 | fi->ext.blk_addr = blk_addr; | |
350 | fi->ext.len = 1; | |
351 | } | |
352 | goto end_update; | |
353 | } | |
354 | ||
6224da87 | 355 | /* Front merge */ |
eb47b800 JK |
356 | if (fofs == start_fofs - 1 && blk_addr == start_blkaddr - 1) { |
357 | fi->ext.fofs--; | |
358 | fi->ext.blk_addr--; | |
359 | fi->ext.len++; | |
360 | goto end_update; | |
361 | } | |
362 | ||
363 | /* Back merge */ | |
364 | if (fofs == end_fofs + 1 && blk_addr == end_blkaddr + 1) { | |
365 | fi->ext.len++; | |
366 | goto end_update; | |
367 | } | |
368 | ||
369 | /* Split the existing extent */ | |
370 | if (fi->ext.len > 1 && | |
371 | fofs >= start_fofs && fofs <= end_fofs) { | |
372 | if ((end_fofs - fofs) < (fi->ext.len >> 1)) { | |
373 | fi->ext.len = fofs - start_fofs; | |
374 | } else { | |
375 | fi->ext.fofs = fofs + 1; | |
376 | fi->ext.blk_addr = start_blkaddr + | |
377 | fofs - start_fofs + 1; | |
378 | fi->ext.len -= fofs - start_fofs + 1; | |
379 | } | |
c11abd1a JK |
380 | } else { |
381 | need_update = false; | |
eb47b800 | 382 | } |
eb47b800 | 383 | |
c11abd1a JK |
384 | /* Finally, if the extent is very fragmented, let's drop the cache. */ |
385 | if (fi->ext.len < F2FS_MIN_EXTENT_LEN) { | |
386 | fi->ext.len = 0; | |
387 | set_inode_flag(fi, FI_NO_EXTENT); | |
388 | need_update = true; | |
389 | } | |
eb47b800 JK |
390 | end_update: |
391 | write_unlock(&fi->ext.ext_lock); | |
c11abd1a JK |
392 | if (need_update) |
393 | sync_inode_page(dn); | |
394 | return; | |
eb47b800 JK |
395 | } |
396 | ||
c718379b | 397 | struct page *find_data_page(struct inode *inode, pgoff_t index, bool sync) |
eb47b800 | 398 | { |
eb47b800 JK |
399 | struct address_space *mapping = inode->i_mapping; |
400 | struct dnode_of_data dn; | |
401 | struct page *page; | |
402 | int err; | |
403 | ||
404 | page = find_get_page(mapping, index); | |
405 | if (page && PageUptodate(page)) | |
406 | return page; | |
407 | f2fs_put_page(page, 0); | |
408 | ||
409 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 410 | err = get_dnode_of_data(&dn, index, LOOKUP_NODE); |
eb47b800 JK |
411 | if (err) |
412 | return ERR_PTR(err); | |
413 | f2fs_put_dnode(&dn); | |
414 | ||
415 | if (dn.data_blkaddr == NULL_ADDR) | |
416 | return ERR_PTR(-ENOENT); | |
417 | ||
418 | /* By fallocate(), there is no cached page, but with NEW_ADDR */ | |
6bacf52f | 419 | if (unlikely(dn.data_blkaddr == NEW_ADDR)) |
eb47b800 JK |
420 | return ERR_PTR(-EINVAL); |
421 | ||
9ac1349a | 422 | page = grab_cache_page(mapping, index); |
eb47b800 JK |
423 | if (!page) |
424 | return ERR_PTR(-ENOMEM); | |
425 | ||
393ff91f JK |
426 | if (PageUptodate(page)) { |
427 | unlock_page(page); | |
428 | return page; | |
429 | } | |
430 | ||
4081363f | 431 | err = f2fs_submit_page_bio(F2FS_I_SB(inode), page, dn.data_blkaddr, |
c718379b | 432 | sync ? READ_SYNC : READA); |
1069bbf7 CY |
433 | if (err) |
434 | return ERR_PTR(err); | |
435 | ||
c718379b JK |
436 | if (sync) { |
437 | wait_on_page_locked(page); | |
6bacf52f | 438 | if (unlikely(!PageUptodate(page))) { |
c718379b JK |
439 | f2fs_put_page(page, 0); |
440 | return ERR_PTR(-EIO); | |
441 | } | |
eb47b800 | 442 | } |
eb47b800 JK |
443 | return page; |
444 | } | |
445 | ||
0a8165d7 | 446 | /* |
eb47b800 JK |
447 | * If it tries to access a hole, return an error. |
448 | * Because, the callers, functions in dir.c and GC, should be able to know | |
449 | * whether this page exists or not. | |
450 | */ | |
451 | struct page *get_lock_data_page(struct inode *inode, pgoff_t index) | |
452 | { | |
eb47b800 JK |
453 | struct address_space *mapping = inode->i_mapping; |
454 | struct dnode_of_data dn; | |
455 | struct page *page; | |
456 | int err; | |
457 | ||
650495de | 458 | repeat: |
9ac1349a | 459 | page = grab_cache_page(mapping, index); |
650495de JK |
460 | if (!page) |
461 | return ERR_PTR(-ENOMEM); | |
462 | ||
eb47b800 | 463 | set_new_dnode(&dn, inode, NULL, NULL, 0); |
266e97a8 | 464 | err = get_dnode_of_data(&dn, index, LOOKUP_NODE); |
650495de JK |
465 | if (err) { |
466 | f2fs_put_page(page, 1); | |
eb47b800 | 467 | return ERR_PTR(err); |
650495de | 468 | } |
eb47b800 JK |
469 | f2fs_put_dnode(&dn); |
470 | ||
6bacf52f | 471 | if (unlikely(dn.data_blkaddr == NULL_ADDR)) { |
650495de | 472 | f2fs_put_page(page, 1); |
eb47b800 | 473 | return ERR_PTR(-ENOENT); |
650495de | 474 | } |
eb47b800 JK |
475 | |
476 | if (PageUptodate(page)) | |
477 | return page; | |
478 | ||
d59ff4df JK |
479 | /* |
480 | * A new dentry page is allocated but not able to be written, since its | |
481 | * new inode page couldn't be allocated due to -ENOSPC. | |
482 | * In such the case, its blkaddr can be remained as NEW_ADDR. | |
483 | * see, f2fs_add_link -> get_new_data_page -> init_inode_metadata. | |
484 | */ | |
485 | if (dn.data_blkaddr == NEW_ADDR) { | |
486 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
487 | SetPageUptodate(page); | |
488 | return page; | |
489 | } | |
eb47b800 | 490 | |
4081363f JK |
491 | err = f2fs_submit_page_bio(F2FS_I_SB(inode), page, |
492 | dn.data_blkaddr, READ_SYNC); | |
393ff91f | 493 | if (err) |
eb47b800 | 494 | return ERR_PTR(err); |
393ff91f JK |
495 | |
496 | lock_page(page); | |
6bacf52f | 497 | if (unlikely(!PageUptodate(page))) { |
393ff91f JK |
498 | f2fs_put_page(page, 1); |
499 | return ERR_PTR(-EIO); | |
eb47b800 | 500 | } |
6bacf52f | 501 | if (unlikely(page->mapping != mapping)) { |
afcb7ca0 JK |
502 | f2fs_put_page(page, 1); |
503 | goto repeat; | |
eb47b800 JK |
504 | } |
505 | return page; | |
506 | } | |
507 | ||
0a8165d7 | 508 | /* |
eb47b800 JK |
509 | * Caller ensures that this data page is never allocated. |
510 | * A new zero-filled data page is allocated in the page cache. | |
39936837 | 511 | * |
4f4124d0 CY |
512 | * Also, caller should grab and release a rwsem by calling f2fs_lock_op() and |
513 | * f2fs_unlock_op(). | |
a8865372 | 514 | * Note that, ipage is set only by make_empty_dir. |
eb47b800 | 515 | */ |
64aa7ed9 | 516 | struct page *get_new_data_page(struct inode *inode, |
a8865372 | 517 | struct page *ipage, pgoff_t index, bool new_i_size) |
eb47b800 | 518 | { |
eb47b800 JK |
519 | struct address_space *mapping = inode->i_mapping; |
520 | struct page *page; | |
521 | struct dnode_of_data dn; | |
522 | int err; | |
523 | ||
a8865372 | 524 | set_new_dnode(&dn, inode, ipage, NULL, 0); |
b600965c | 525 | err = f2fs_reserve_block(&dn, index); |
eb47b800 JK |
526 | if (err) |
527 | return ERR_PTR(err); | |
afcb7ca0 | 528 | repeat: |
eb47b800 | 529 | page = grab_cache_page(mapping, index); |
a8865372 JK |
530 | if (!page) { |
531 | err = -ENOMEM; | |
532 | goto put_err; | |
533 | } | |
eb47b800 JK |
534 | |
535 | if (PageUptodate(page)) | |
536 | return page; | |
537 | ||
538 | if (dn.data_blkaddr == NEW_ADDR) { | |
539 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
393ff91f | 540 | SetPageUptodate(page); |
eb47b800 | 541 | } else { |
4081363f JK |
542 | err = f2fs_submit_page_bio(F2FS_I_SB(inode), page, |
543 | dn.data_blkaddr, READ_SYNC); | |
393ff91f | 544 | if (err) |
a8865372 JK |
545 | goto put_err; |
546 | ||
393ff91f | 547 | lock_page(page); |
6bacf52f | 548 | if (unlikely(!PageUptodate(page))) { |
393ff91f | 549 | f2fs_put_page(page, 1); |
a8865372 JK |
550 | err = -EIO; |
551 | goto put_err; | |
eb47b800 | 552 | } |
6bacf52f | 553 | if (unlikely(page->mapping != mapping)) { |
afcb7ca0 JK |
554 | f2fs_put_page(page, 1); |
555 | goto repeat; | |
eb47b800 JK |
556 | } |
557 | } | |
eb47b800 JK |
558 | |
559 | if (new_i_size && | |
560 | i_size_read(inode) < ((index + 1) << PAGE_CACHE_SHIFT)) { | |
561 | i_size_write(inode, ((index + 1) << PAGE_CACHE_SHIFT)); | |
699489bb JK |
562 | /* Only the directory inode sets new_i_size */ |
563 | set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR); | |
eb47b800 JK |
564 | } |
565 | return page; | |
a8865372 JK |
566 | |
567 | put_err: | |
568 | f2fs_put_dnode(&dn); | |
569 | return ERR_PTR(err); | |
eb47b800 JK |
570 | } |
571 | ||
bfad7c2d JK |
572 | static int __allocate_data_block(struct dnode_of_data *dn) |
573 | { | |
4081363f | 574 | struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode); |
976e4c50 | 575 | struct f2fs_inode_info *fi = F2FS_I(dn->inode); |
bfad7c2d JK |
576 | struct f2fs_summary sum; |
577 | block_t new_blkaddr; | |
578 | struct node_info ni; | |
976e4c50 | 579 | pgoff_t fofs; |
bfad7c2d JK |
580 | int type; |
581 | ||
582 | if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC))) | |
583 | return -EPERM; | |
584 | if (unlikely(!inc_valid_block_count(sbi, dn->inode, 1))) | |
585 | return -ENOSPC; | |
586 | ||
587 | __set_data_blkaddr(dn, NEW_ADDR); | |
588 | dn->data_blkaddr = NEW_ADDR; | |
589 | ||
590 | get_node_info(sbi, dn->nid, &ni); | |
591 | set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version); | |
592 | ||
593 | type = CURSEG_WARM_DATA; | |
594 | ||
595 | allocate_data_block(sbi, NULL, NULL_ADDR, &new_blkaddr, &sum, type); | |
596 | ||
597 | /* direct IO doesn't use extent cache to maximize the performance */ | |
598 | set_inode_flag(F2FS_I(dn->inode), FI_NO_EXTENT); | |
599 | update_extent_cache(new_blkaddr, dn); | |
600 | clear_inode_flag(F2FS_I(dn->inode), FI_NO_EXTENT); | |
601 | ||
976e4c50 JK |
602 | /* update i_size */ |
603 | fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) + | |
604 | dn->ofs_in_node; | |
605 | if (i_size_read(dn->inode) < ((fofs + 1) << PAGE_CACHE_SHIFT)) | |
606 | i_size_write(dn->inode, ((fofs + 1) << PAGE_CACHE_SHIFT)); | |
607 | ||
bfad7c2d JK |
608 | dn->data_blkaddr = new_blkaddr; |
609 | return 0; | |
610 | } | |
611 | ||
0a8165d7 | 612 | /* |
4f4124d0 CY |
613 | * get_data_block() now supported readahead/bmap/rw direct_IO with mapped bh. |
614 | * If original data blocks are allocated, then give them to blockdev. | |
615 | * Otherwise, | |
616 | * a. preallocate requested block addresses | |
617 | * b. do not use extent cache for better performance | |
618 | * c. give the block addresses to blockdev | |
eb47b800 | 619 | */ |
ccfb3000 JK |
620 | static int __get_data_block(struct inode *inode, sector_t iblock, |
621 | struct buffer_head *bh_result, int create, bool fiemap) | |
eb47b800 JK |
622 | { |
623 | unsigned int blkbits = inode->i_sb->s_blocksize_bits; | |
624 | unsigned maxblocks = bh_result->b_size >> blkbits; | |
625 | struct dnode_of_data dn; | |
bfad7c2d JK |
626 | int mode = create ? ALLOC_NODE : LOOKUP_NODE_RA; |
627 | pgoff_t pgofs, end_offset; | |
628 | int err = 0, ofs = 1; | |
629 | bool allocated = false; | |
eb47b800 JK |
630 | |
631 | /* Get the page offset from the block offset(iblock) */ | |
632 | pgofs = (pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits)); | |
633 | ||
bfad7c2d JK |
634 | if (check_extent_cache(inode, pgofs, bh_result)) |
635 | goto out; | |
636 | ||
79e35dc3 | 637 | if (create) { |
4081363f JK |
638 | f2fs_balance_fs(F2FS_I_SB(inode)); |
639 | f2fs_lock_op(F2FS_I_SB(inode)); | |
79e35dc3 | 640 | } |
eb47b800 JK |
641 | |
642 | /* When reading holes, we need its node page */ | |
643 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
bfad7c2d | 644 | err = get_dnode_of_data(&dn, pgofs, mode); |
1ec79083 | 645 | if (err) { |
bfad7c2d JK |
646 | if (err == -ENOENT) |
647 | err = 0; | |
648 | goto unlock_out; | |
848753aa | 649 | } |
ccfb3000 | 650 | if (dn.data_blkaddr == NEW_ADDR && !fiemap) |
1ec79083 | 651 | goto put_out; |
eb47b800 | 652 | |
bfad7c2d JK |
653 | if (dn.data_blkaddr != NULL_ADDR) { |
654 | map_bh(bh_result, inode->i_sb, dn.data_blkaddr); | |
655 | } else if (create) { | |
656 | err = __allocate_data_block(&dn); | |
657 | if (err) | |
658 | goto put_out; | |
659 | allocated = true; | |
660 | map_bh(bh_result, inode->i_sb, dn.data_blkaddr); | |
661 | } else { | |
662 | goto put_out; | |
663 | } | |
664 | ||
6403eb1f | 665 | end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode)); |
bfad7c2d JK |
666 | bh_result->b_size = (((size_t)1) << blkbits); |
667 | dn.ofs_in_node++; | |
668 | pgofs++; | |
669 | ||
670 | get_next: | |
671 | if (dn.ofs_in_node >= end_offset) { | |
672 | if (allocated) | |
673 | sync_inode_page(&dn); | |
674 | allocated = false; | |
675 | f2fs_put_dnode(&dn); | |
676 | ||
677 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
678 | err = get_dnode_of_data(&dn, pgofs, mode); | |
1ec79083 | 679 | if (err) { |
bfad7c2d JK |
680 | if (err == -ENOENT) |
681 | err = 0; | |
682 | goto unlock_out; | |
683 | } | |
ccfb3000 | 684 | if (dn.data_blkaddr == NEW_ADDR && !fiemap) |
1ec79083 JK |
685 | goto put_out; |
686 | ||
6403eb1f | 687 | end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode)); |
bfad7c2d | 688 | } |
eb47b800 | 689 | |
bfad7c2d JK |
690 | if (maxblocks > (bh_result->b_size >> blkbits)) { |
691 | block_t blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node); | |
692 | if (blkaddr == NULL_ADDR && create) { | |
693 | err = __allocate_data_block(&dn); | |
694 | if (err) | |
695 | goto sync_out; | |
696 | allocated = true; | |
697 | blkaddr = dn.data_blkaddr; | |
698 | } | |
e1c42045 | 699 | /* Give more consecutive addresses for the readahead */ |
bfad7c2d JK |
700 | if (blkaddr == (bh_result->b_blocknr + ofs)) { |
701 | ofs++; | |
702 | dn.ofs_in_node++; | |
703 | pgofs++; | |
704 | bh_result->b_size += (((size_t)1) << blkbits); | |
705 | goto get_next; | |
706 | } | |
eb47b800 | 707 | } |
bfad7c2d JK |
708 | sync_out: |
709 | if (allocated) | |
710 | sync_inode_page(&dn); | |
711 | put_out: | |
eb47b800 | 712 | f2fs_put_dnode(&dn); |
bfad7c2d JK |
713 | unlock_out: |
714 | if (create) | |
4081363f | 715 | f2fs_unlock_op(F2FS_I_SB(inode)); |
bfad7c2d JK |
716 | out: |
717 | trace_f2fs_get_data_block(inode, iblock, bh_result, err); | |
718 | return err; | |
eb47b800 JK |
719 | } |
720 | ||
ccfb3000 JK |
721 | static int get_data_block(struct inode *inode, sector_t iblock, |
722 | struct buffer_head *bh_result, int create) | |
723 | { | |
724 | return __get_data_block(inode, iblock, bh_result, create, false); | |
725 | } | |
726 | ||
727 | static int get_data_block_fiemap(struct inode *inode, sector_t iblock, | |
728 | struct buffer_head *bh_result, int create) | |
729 | { | |
730 | return __get_data_block(inode, iblock, bh_result, create, true); | |
731 | } | |
732 | ||
9ab70134 JK |
733 | int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
734 | u64 start, u64 len) | |
735 | { | |
ccfb3000 JK |
736 | return generic_block_fiemap(inode, fieinfo, |
737 | start, len, get_data_block_fiemap); | |
9ab70134 JK |
738 | } |
739 | ||
eb47b800 JK |
740 | static int f2fs_read_data_page(struct file *file, struct page *page) |
741 | { | |
9ffe0fb5 HL |
742 | struct inode *inode = page->mapping->host; |
743 | int ret; | |
744 | ||
c20e89cd CY |
745 | trace_f2fs_readpage(page, DATA); |
746 | ||
e1c42045 | 747 | /* If the file has inline data, try to read it directly */ |
9ffe0fb5 HL |
748 | if (f2fs_has_inline_data(inode)) |
749 | ret = f2fs_read_inline_data(inode, page); | |
750 | else | |
751 | ret = mpage_readpage(page, get_data_block); | |
752 | ||
753 | return ret; | |
eb47b800 JK |
754 | } |
755 | ||
756 | static int f2fs_read_data_pages(struct file *file, | |
757 | struct address_space *mapping, | |
758 | struct list_head *pages, unsigned nr_pages) | |
759 | { | |
9ffe0fb5 HL |
760 | struct inode *inode = file->f_mapping->host; |
761 | ||
762 | /* If the file has inline data, skip readpages */ | |
763 | if (f2fs_has_inline_data(inode)) | |
764 | return 0; | |
765 | ||
bfad7c2d | 766 | return mpage_readpages(mapping, pages, nr_pages, get_data_block); |
eb47b800 JK |
767 | } |
768 | ||
458e6197 | 769 | int do_write_data_page(struct page *page, struct f2fs_io_info *fio) |
eb47b800 JK |
770 | { |
771 | struct inode *inode = page->mapping->host; | |
458e6197 | 772 | block_t old_blkaddr, new_blkaddr; |
eb47b800 JK |
773 | struct dnode_of_data dn; |
774 | int err = 0; | |
775 | ||
776 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 777 | err = get_dnode_of_data(&dn, page->index, LOOKUP_NODE); |
eb47b800 JK |
778 | if (err) |
779 | return err; | |
780 | ||
458e6197 | 781 | old_blkaddr = dn.data_blkaddr; |
eb47b800 JK |
782 | |
783 | /* This page is already truncated */ | |
458e6197 | 784 | if (old_blkaddr == NULL_ADDR) |
eb47b800 JK |
785 | goto out_writepage; |
786 | ||
787 | set_page_writeback(page); | |
788 | ||
789 | /* | |
790 | * If current allocation needs SSR, | |
791 | * it had better in-place writes for updated data. | |
792 | */ | |
458e6197 | 793 | if (unlikely(old_blkaddr != NEW_ADDR && |
b25958b6 HL |
794 | !is_cold_data(page) && |
795 | need_inplace_update(inode))) { | |
458e6197 | 796 | rewrite_data_page(page, old_blkaddr, fio); |
fff04f90 | 797 | set_inode_flag(F2FS_I(inode), FI_UPDATE_WRITE); |
eb47b800 | 798 | } else { |
458e6197 JK |
799 | write_data_page(page, &dn, &new_blkaddr, fio); |
800 | update_extent_cache(new_blkaddr, &dn); | |
fff04f90 | 801 | set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE); |
eb47b800 JK |
802 | } |
803 | out_writepage: | |
804 | f2fs_put_dnode(&dn); | |
805 | return err; | |
806 | } | |
807 | ||
808 | static int f2fs_write_data_page(struct page *page, | |
809 | struct writeback_control *wbc) | |
810 | { | |
811 | struct inode *inode = page->mapping->host; | |
4081363f | 812 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
eb47b800 JK |
813 | loff_t i_size = i_size_read(inode); |
814 | const pgoff_t end_index = ((unsigned long long) i_size) | |
815 | >> PAGE_CACHE_SHIFT; | |
9ffe0fb5 | 816 | unsigned offset = 0; |
39936837 | 817 | bool need_balance_fs = false; |
eb47b800 | 818 | int err = 0; |
458e6197 JK |
819 | struct f2fs_io_info fio = { |
820 | .type = DATA, | |
6c311ec6 | 821 | .rw = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : WRITE, |
458e6197 | 822 | }; |
eb47b800 | 823 | |
ecda0de3 CY |
824 | trace_f2fs_writepage(page, DATA); |
825 | ||
eb47b800 | 826 | if (page->index < end_index) |
39936837 | 827 | goto write; |
eb47b800 JK |
828 | |
829 | /* | |
830 | * If the offset is out-of-range of file size, | |
831 | * this page does not have to be written to disk. | |
832 | */ | |
833 | offset = i_size & (PAGE_CACHE_SIZE - 1); | |
76f60268 | 834 | if ((page->index >= end_index + 1) || !offset) |
39936837 | 835 | goto out; |
eb47b800 JK |
836 | |
837 | zero_user_segment(page, offset, PAGE_CACHE_SIZE); | |
39936837 | 838 | write: |
8618b881 | 839 | if (unlikely(sbi->por_doing)) |
eb47b800 JK |
840 | goto redirty_out; |
841 | ||
39936837 | 842 | /* Dentry blocks are controlled by checkpoint */ |
eb47b800 | 843 | if (S_ISDIR(inode->i_mode)) { |
cf779cab JK |
844 | if (unlikely(f2fs_cp_error(sbi))) |
845 | goto redirty_out; | |
458e6197 | 846 | err = do_write_data_page(page, &fio); |
8618b881 JK |
847 | goto done; |
848 | } | |
9ffe0fb5 | 849 | |
cf779cab JK |
850 | /* we should bypass data pages to proceed the kworkder jobs */ |
851 | if (unlikely(f2fs_cp_error(sbi))) { | |
852 | SetPageError(page); | |
853 | unlock_page(page); | |
a7ffdbe2 | 854 | goto out; |
cf779cab JK |
855 | } |
856 | ||
8618b881 | 857 | if (!wbc->for_reclaim) |
39936837 | 858 | need_balance_fs = true; |
8618b881 | 859 | else if (has_not_enough_free_secs(sbi, 0)) |
39936837 | 860 | goto redirty_out; |
eb47b800 | 861 | |
8618b881 JK |
862 | f2fs_lock_op(sbi); |
863 | if (f2fs_has_inline_data(inode) || f2fs_may_inline(inode)) | |
864 | err = f2fs_write_inline_data(inode, page, offset); | |
865 | else | |
866 | err = do_write_data_page(page, &fio); | |
867 | f2fs_unlock_op(sbi); | |
868 | done: | |
869 | if (err && err != -ENOENT) | |
870 | goto redirty_out; | |
eb47b800 | 871 | |
eb47b800 | 872 | clear_cold_data(page); |
39936837 | 873 | out: |
a7ffdbe2 | 874 | inode_dec_dirty_pages(inode); |
eb47b800 | 875 | unlock_page(page); |
39936837 | 876 | if (need_balance_fs) |
eb47b800 | 877 | f2fs_balance_fs(sbi); |
2aea39ec JK |
878 | if (wbc->for_reclaim) |
879 | f2fs_submit_merged_bio(sbi, DATA, WRITE); | |
eb47b800 JK |
880 | return 0; |
881 | ||
eb47b800 | 882 | redirty_out: |
76f60268 | 883 | redirty_page_for_writepage(wbc, page); |
8618b881 | 884 | return AOP_WRITEPAGE_ACTIVATE; |
eb47b800 JK |
885 | } |
886 | ||
fa9150a8 NJ |
887 | static int __f2fs_writepage(struct page *page, struct writeback_control *wbc, |
888 | void *data) | |
889 | { | |
890 | struct address_space *mapping = data; | |
891 | int ret = mapping->a_ops->writepage(page, wbc); | |
892 | mapping_set_error(mapping, ret); | |
893 | return ret; | |
894 | } | |
895 | ||
25ca923b | 896 | static int f2fs_write_data_pages(struct address_space *mapping, |
eb47b800 JK |
897 | struct writeback_control *wbc) |
898 | { | |
899 | struct inode *inode = mapping->host; | |
4081363f | 900 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
531ad7d5 | 901 | bool locked = false; |
eb47b800 | 902 | int ret; |
50c8cdb3 | 903 | long diff; |
eb47b800 | 904 | |
e5748434 CY |
905 | trace_f2fs_writepages(mapping->host, wbc, DATA); |
906 | ||
cfb185a1 | 907 | /* deal with chardevs and other special file */ |
908 | if (!mapping->a_ops->writepage) | |
909 | return 0; | |
910 | ||
87d6f890 | 911 | if (S_ISDIR(inode->i_mode) && wbc->sync_mode == WB_SYNC_NONE && |
a7ffdbe2 | 912 | get_dirty_pages(inode) < nr_pages_to_skip(sbi, DATA) && |
6fb03f3a | 913 | available_free_memory(sbi, DIRTY_DENTS)) |
d3baf95d | 914 | goto skip_write; |
87d6f890 | 915 | |
50c8cdb3 | 916 | diff = nr_pages_to_write(sbi, DATA, wbc); |
eb47b800 | 917 | |
531ad7d5 | 918 | if (!S_ISDIR(inode->i_mode)) { |
eb47b800 | 919 | mutex_lock(&sbi->writepages); |
531ad7d5 JK |
920 | locked = true; |
921 | } | |
fa9150a8 | 922 | ret = write_cache_pages(mapping, wbc, __f2fs_writepage, mapping); |
531ad7d5 | 923 | if (locked) |
eb47b800 | 924 | mutex_unlock(&sbi->writepages); |
458e6197 JK |
925 | |
926 | f2fs_submit_merged_bio(sbi, DATA, WRITE); | |
eb47b800 JK |
927 | |
928 | remove_dirty_dir_inode(inode); | |
929 | ||
50c8cdb3 | 930 | wbc->nr_to_write = max((long)0, wbc->nr_to_write - diff); |
eb47b800 | 931 | return ret; |
d3baf95d JK |
932 | |
933 | skip_write: | |
a7ffdbe2 | 934 | wbc->pages_skipped += get_dirty_pages(inode); |
d3baf95d | 935 | return 0; |
eb47b800 JK |
936 | } |
937 | ||
3aab8f82 CY |
938 | static void f2fs_write_failed(struct address_space *mapping, loff_t to) |
939 | { | |
940 | struct inode *inode = mapping->host; | |
941 | ||
942 | if (to > inode->i_size) { | |
943 | truncate_pagecache(inode, inode->i_size); | |
764aa3e9 | 944 | truncate_blocks(inode, inode->i_size, true); |
3aab8f82 CY |
945 | } |
946 | } | |
947 | ||
eb47b800 JK |
948 | static int f2fs_write_begin(struct file *file, struct address_space *mapping, |
949 | loff_t pos, unsigned len, unsigned flags, | |
950 | struct page **pagep, void **fsdata) | |
951 | { | |
952 | struct inode *inode = mapping->host; | |
4081363f | 953 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
eb47b800 JK |
954 | struct page *page; |
955 | pgoff_t index = ((unsigned long long) pos) >> PAGE_CACHE_SHIFT; | |
956 | struct dnode_of_data dn; | |
957 | int err = 0; | |
958 | ||
62aed044 CY |
959 | trace_f2fs_write_begin(inode, pos, len, flags); |
960 | ||
eb47b800 | 961 | f2fs_balance_fs(sbi); |
afcb7ca0 | 962 | repeat: |
b067ba1f | 963 | err = f2fs_convert_inline_data(inode, pos + len, NULL); |
9e09fc85 | 964 | if (err) |
3aab8f82 | 965 | goto fail; |
9e09fc85 | 966 | |
eb47b800 | 967 | page = grab_cache_page_write_begin(mapping, index, flags); |
3aab8f82 CY |
968 | if (!page) { |
969 | err = -ENOMEM; | |
970 | goto fail; | |
971 | } | |
d5f66990 JK |
972 | |
973 | /* to avoid latency during memory pressure */ | |
974 | unlock_page(page); | |
975 | ||
eb47b800 JK |
976 | *pagep = page; |
977 | ||
9e09fc85 JK |
978 | if (f2fs_has_inline_data(inode) && (pos + len) <= MAX_INLINE_DATA) |
979 | goto inline_data; | |
9ffe0fb5 | 980 | |
e479556b | 981 | f2fs_lock_op(sbi); |
eb47b800 | 982 | set_new_dnode(&dn, inode, NULL, NULL, 0); |
b600965c | 983 | err = f2fs_reserve_block(&dn, index); |
e479556b | 984 | f2fs_unlock_op(sbi); |
b600965c | 985 | if (err) { |
d5f66990 | 986 | f2fs_put_page(page, 0); |
3aab8f82 | 987 | goto fail; |
b600965c | 988 | } |
9ffe0fb5 | 989 | inline_data: |
d5f66990 JK |
990 | lock_page(page); |
991 | if (unlikely(page->mapping != mapping)) { | |
992 | f2fs_put_page(page, 1); | |
993 | goto repeat; | |
994 | } | |
995 | ||
996 | f2fs_wait_on_page_writeback(page, DATA); | |
997 | ||
eb47b800 JK |
998 | if ((len == PAGE_CACHE_SIZE) || PageUptodate(page)) |
999 | return 0; | |
1000 | ||
1001 | if ((pos & PAGE_CACHE_MASK) >= i_size_read(inode)) { | |
1002 | unsigned start = pos & (PAGE_CACHE_SIZE - 1); | |
1003 | unsigned end = start + len; | |
1004 | ||
1005 | /* Reading beyond i_size is simple: memset to zero */ | |
1006 | zero_user_segments(page, 0, start, end, PAGE_CACHE_SIZE); | |
393ff91f | 1007 | goto out; |
eb47b800 JK |
1008 | } |
1009 | ||
1010 | if (dn.data_blkaddr == NEW_ADDR) { | |
1011 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
1012 | } else { | |
d54c795b | 1013 | if (f2fs_has_inline_data(inode)) { |
9ffe0fb5 | 1014 | err = f2fs_read_inline_data(inode, page); |
d54c795b CY |
1015 | if (err) { |
1016 | page_cache_release(page); | |
3aab8f82 | 1017 | goto fail; |
d54c795b CY |
1018 | } |
1019 | } else { | |
9ffe0fb5 | 1020 | err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr, |
93dfe2ac | 1021 | READ_SYNC); |
d54c795b | 1022 | if (err) |
3aab8f82 | 1023 | goto fail; |
d54c795b CY |
1024 | } |
1025 | ||
393ff91f | 1026 | lock_page(page); |
6bacf52f | 1027 | if (unlikely(!PageUptodate(page))) { |
393ff91f | 1028 | f2fs_put_page(page, 1); |
3aab8f82 CY |
1029 | err = -EIO; |
1030 | goto fail; | |
eb47b800 | 1031 | } |
6bacf52f | 1032 | if (unlikely(page->mapping != mapping)) { |
afcb7ca0 JK |
1033 | f2fs_put_page(page, 1); |
1034 | goto repeat; | |
eb47b800 JK |
1035 | } |
1036 | } | |
393ff91f | 1037 | out: |
eb47b800 JK |
1038 | SetPageUptodate(page); |
1039 | clear_cold_data(page); | |
1040 | return 0; | |
3aab8f82 CY |
1041 | fail: |
1042 | f2fs_write_failed(mapping, pos + len); | |
1043 | return err; | |
eb47b800 JK |
1044 | } |
1045 | ||
a1dd3c13 JK |
1046 | static int f2fs_write_end(struct file *file, |
1047 | struct address_space *mapping, | |
1048 | loff_t pos, unsigned len, unsigned copied, | |
1049 | struct page *page, void *fsdata) | |
1050 | { | |
1051 | struct inode *inode = page->mapping->host; | |
1052 | ||
dfb2bf38 CY |
1053 | trace_f2fs_write_end(inode, pos, len, copied); |
1054 | ||
02a1335f | 1055 | if (f2fs_is_atomic_file(inode) || f2fs_is_volatile_file(inode)) |
88b88a66 JK |
1056 | register_inmem_page(inode, page); |
1057 | else | |
1058 | set_page_dirty(page); | |
a1dd3c13 JK |
1059 | |
1060 | if (pos + copied > i_size_read(inode)) { | |
1061 | i_size_write(inode, pos + copied); | |
1062 | mark_inode_dirty(inode); | |
1063 | update_inode_page(inode); | |
1064 | } | |
1065 | ||
75c3c8bc | 1066 | f2fs_put_page(page, 1); |
a1dd3c13 JK |
1067 | return copied; |
1068 | } | |
1069 | ||
944fcfc1 | 1070 | static int check_direct_IO(struct inode *inode, int rw, |
5b46f25d | 1071 | struct iov_iter *iter, loff_t offset) |
944fcfc1 JK |
1072 | { |
1073 | unsigned blocksize_mask = inode->i_sb->s_blocksize - 1; | |
944fcfc1 JK |
1074 | |
1075 | if (rw == READ) | |
1076 | return 0; | |
1077 | ||
1078 | if (offset & blocksize_mask) | |
1079 | return -EINVAL; | |
1080 | ||
5b46f25d AV |
1081 | if (iov_iter_alignment(iter) & blocksize_mask) |
1082 | return -EINVAL; | |
1083 | ||
944fcfc1 JK |
1084 | return 0; |
1085 | } | |
1086 | ||
eb47b800 | 1087 | static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb, |
d8d3d94b | 1088 | struct iov_iter *iter, loff_t offset) |
eb47b800 JK |
1089 | { |
1090 | struct file *file = iocb->ki_filp; | |
3aab8f82 CY |
1091 | struct address_space *mapping = file->f_mapping; |
1092 | struct inode *inode = mapping->host; | |
1093 | size_t count = iov_iter_count(iter); | |
1094 | int err; | |
944fcfc1 | 1095 | |
9ffe0fb5 HL |
1096 | /* Let buffer I/O handle the inline data case. */ |
1097 | if (f2fs_has_inline_data(inode)) | |
1098 | return 0; | |
1099 | ||
5b46f25d | 1100 | if (check_direct_IO(inode, rw, iter, offset)) |
944fcfc1 JK |
1101 | return 0; |
1102 | ||
70407fad CY |
1103 | trace_f2fs_direct_IO_enter(inode, offset, count, rw); |
1104 | ||
3aab8f82 CY |
1105 | err = blockdev_direct_IO(rw, iocb, inode, iter, offset, get_data_block); |
1106 | if (err < 0 && (rw & WRITE)) | |
1107 | f2fs_write_failed(mapping, offset + count); | |
70407fad CY |
1108 | |
1109 | trace_f2fs_direct_IO_exit(inode, offset, count, rw, err); | |
1110 | ||
3aab8f82 | 1111 | return err; |
eb47b800 JK |
1112 | } |
1113 | ||
d47992f8 LC |
1114 | static void f2fs_invalidate_data_page(struct page *page, unsigned int offset, |
1115 | unsigned int length) | |
eb47b800 JK |
1116 | { |
1117 | struct inode *inode = page->mapping->host; | |
a7ffdbe2 JK |
1118 | |
1119 | if (offset % PAGE_CACHE_SIZE || length != PAGE_CACHE_SIZE) | |
1120 | return; | |
1121 | ||
1fe54f9d | 1122 | if (PageDirty(page)) |
a7ffdbe2 | 1123 | inode_dec_dirty_pages(inode); |
eb47b800 JK |
1124 | ClearPagePrivate(page); |
1125 | } | |
1126 | ||
1127 | static int f2fs_release_data_page(struct page *page, gfp_t wait) | |
1128 | { | |
1129 | ClearPagePrivate(page); | |
c3850aa1 | 1130 | return 1; |
eb47b800 JK |
1131 | } |
1132 | ||
1133 | static int f2fs_set_data_page_dirty(struct page *page) | |
1134 | { | |
1135 | struct address_space *mapping = page->mapping; | |
1136 | struct inode *inode = mapping->host; | |
1137 | ||
26c6b887 JK |
1138 | trace_f2fs_set_page_dirty(page, DATA); |
1139 | ||
eb47b800 | 1140 | SetPageUptodate(page); |
a18ff063 JK |
1141 | mark_inode_dirty(inode); |
1142 | ||
eb47b800 JK |
1143 | if (!PageDirty(page)) { |
1144 | __set_page_dirty_nobuffers(page); | |
a7ffdbe2 | 1145 | update_dirty_page(inode, page); |
eb47b800 JK |
1146 | return 1; |
1147 | } | |
1148 | return 0; | |
1149 | } | |
1150 | ||
c01e54b7 JK |
1151 | static sector_t f2fs_bmap(struct address_space *mapping, sector_t block) |
1152 | { | |
454ae7e5 CY |
1153 | struct inode *inode = mapping->host; |
1154 | ||
1155 | if (f2fs_has_inline_data(inode)) | |
1156 | return 0; | |
1157 | ||
bfad7c2d | 1158 | return generic_block_bmap(mapping, block, get_data_block); |
c01e54b7 JK |
1159 | } |
1160 | ||
eb47b800 JK |
1161 | const struct address_space_operations f2fs_dblock_aops = { |
1162 | .readpage = f2fs_read_data_page, | |
1163 | .readpages = f2fs_read_data_pages, | |
1164 | .writepage = f2fs_write_data_page, | |
1165 | .writepages = f2fs_write_data_pages, | |
1166 | .write_begin = f2fs_write_begin, | |
a1dd3c13 | 1167 | .write_end = f2fs_write_end, |
eb47b800 JK |
1168 | .set_page_dirty = f2fs_set_data_page_dirty, |
1169 | .invalidatepage = f2fs_invalidate_data_page, | |
1170 | .releasepage = f2fs_release_data_page, | |
1171 | .direct_IO = f2fs_direct_IO, | |
c01e54b7 | 1172 | .bmap = f2fs_bmap, |
eb47b800 | 1173 | }; |