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 | /* |
28 | * Low-level block read/write IO operations. | |
29 | */ | |
30 | static struct bio *__bio_alloc(struct block_device *bdev, int npages) | |
31 | { | |
32 | struct bio *bio; | |
33 | ||
34 | /* No failure on bio allocation */ | |
35 | bio = bio_alloc(GFP_NOIO, npages); | |
36 | bio->bi_bdev = bdev; | |
37 | bio->bi_private = NULL; | |
38 | return bio; | |
39 | } | |
40 | ||
41 | static void f2fs_read_end_io(struct bio *bio, int err) | |
42 | { | |
43 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
44 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | |
45 | ||
46 | do { | |
47 | struct page *page = bvec->bv_page; | |
48 | ||
49 | if (--bvec >= bio->bi_io_vec) | |
50 | prefetchw(&bvec->bv_page->flags); | |
51 | ||
6bacf52f | 52 | if (unlikely(!uptodate)) { |
93dfe2ac JK |
53 | ClearPageUptodate(page); |
54 | SetPageError(page); | |
6bacf52f JK |
55 | } else { |
56 | SetPageUptodate(page); | |
93dfe2ac JK |
57 | } |
58 | unlock_page(page); | |
59 | } while (bvec >= bio->bi_io_vec); | |
60 | ||
61 | bio_put(bio); | |
62 | } | |
63 | ||
64 | static void f2fs_write_end_io(struct bio *bio, int err) | |
65 | { | |
66 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
67 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | |
68 | struct f2fs_sb_info *sbi = F2FS_SB(bvec->bv_page->mapping->host->i_sb); | |
69 | ||
70 | do { | |
71 | struct page *page = bvec->bv_page; | |
72 | ||
73 | if (--bvec >= bio->bi_io_vec) | |
74 | prefetchw(&bvec->bv_page->flags); | |
75 | ||
6bacf52f | 76 | if (unlikely(!uptodate)) { |
93dfe2ac JK |
77 | SetPageError(page); |
78 | set_bit(AS_EIO, &page->mapping->flags); | |
79 | set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG); | |
80 | sbi->sb->s_flags |= MS_RDONLY; | |
81 | } | |
82 | end_page_writeback(page); | |
83 | dec_page_count(sbi, F2FS_WRITEBACK); | |
84 | } while (bvec >= bio->bi_io_vec); | |
85 | ||
86 | if (bio->bi_private) | |
87 | complete(bio->bi_private); | |
88 | ||
89 | if (!get_pages(sbi, F2FS_WRITEBACK) && | |
90 | !list_empty(&sbi->cp_wait.task_list)) | |
91 | wake_up(&sbi->cp_wait); | |
92 | ||
93 | bio_put(bio); | |
94 | } | |
95 | ||
458e6197 | 96 | static void __submit_merged_bio(struct f2fs_bio_info *io) |
93dfe2ac | 97 | { |
458e6197 JK |
98 | struct f2fs_io_info *fio = &io->fio; |
99 | int rw; | |
93dfe2ac JK |
100 | |
101 | if (!io->bio) | |
102 | return; | |
103 | ||
458e6197 | 104 | rw = fio->rw | fio->rw_flag; |
93dfe2ac JK |
105 | |
106 | if (is_read_io(rw)) { | |
458e6197 | 107 | trace_f2fs_submit_read_bio(io->sbi->sb, rw, fio->type, io->bio); |
76130cca | 108 | submit_bio(rw, io->bio); |
93dfe2ac JK |
109 | io->bio = NULL; |
110 | return; | |
111 | } | |
76130cca | 112 | trace_f2fs_submit_write_bio(io->sbi->sb, rw, fio->type, io->bio); |
93dfe2ac | 113 | |
93dfe2ac JK |
114 | /* |
115 | * META_FLUSH is only from the checkpoint procedure, and we should wait | |
116 | * this metadata bio for FS consistency. | |
117 | */ | |
458e6197 | 118 | if (fio->type == META_FLUSH) { |
93dfe2ac JK |
119 | DECLARE_COMPLETION_ONSTACK(wait); |
120 | io->bio->bi_private = &wait; | |
121 | submit_bio(rw, io->bio); | |
122 | wait_for_completion(&wait); | |
123 | } else { | |
124 | submit_bio(rw, io->bio); | |
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 | ||
137 | mutex_lock(&io->io_mutex); | |
458e6197 JK |
138 | |
139 | /* change META to META_FLUSH in the checkpoint procedure */ | |
140 | if (type >= META_FLUSH) { | |
141 | io->fio.type = META_FLUSH; | |
142 | io->fio.rw = WRITE_FLUSH_FUA; | |
143 | } | |
144 | __submit_merged_bio(io); | |
93dfe2ac JK |
145 | mutex_unlock(&io->io_mutex); |
146 | } | |
147 | ||
148 | /* | |
149 | * Fill the locked page with data located in the block address. | |
150 | * Return unlocked page. | |
151 | */ | |
152 | int f2fs_submit_page_bio(struct f2fs_sb_info *sbi, struct page *page, | |
153 | block_t blk_addr, int rw) | |
154 | { | |
155 | struct block_device *bdev = sbi->sb->s_bdev; | |
156 | struct bio *bio; | |
157 | ||
158 | trace_f2fs_submit_page_bio(page, blk_addr, rw); | |
159 | ||
160 | /* Allocate a new bio */ | |
161 | bio = __bio_alloc(bdev, 1); | |
162 | ||
163 | /* Initialize the bio */ | |
164 | bio->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr); | |
165 | bio->bi_end_io = is_read_io(rw) ? f2fs_read_end_io : f2fs_write_end_io; | |
166 | ||
167 | if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) { | |
168 | bio_put(bio); | |
169 | f2fs_put_page(page, 1); | |
170 | return -EFAULT; | |
171 | } | |
172 | ||
173 | submit_bio(rw, bio); | |
174 | return 0; | |
175 | } | |
176 | ||
177 | void f2fs_submit_page_mbio(struct f2fs_sb_info *sbi, struct page *page, | |
458e6197 | 178 | block_t blk_addr, struct f2fs_io_info *fio) |
93dfe2ac | 179 | { |
458e6197 | 180 | enum page_type btype = PAGE_TYPE_OF_BIO(fio->type); |
93dfe2ac JK |
181 | struct block_device *bdev = sbi->sb->s_bdev; |
182 | struct f2fs_bio_info *io; | |
183 | int bio_blocks; | |
184 | ||
458e6197 | 185 | io = is_read_io(fio->rw) ? &sbi->read_io : &sbi->write_io[btype]; |
93dfe2ac JK |
186 | |
187 | verify_block_addr(sbi, blk_addr); | |
188 | ||
189 | mutex_lock(&io->io_mutex); | |
190 | ||
458e6197 | 191 | if (!is_read_io(fio->rw)) |
93dfe2ac JK |
192 | inc_page_count(sbi, F2FS_WRITEBACK); |
193 | ||
63a0b7cb | 194 | if (io->bio && (io->last_block_in_bio != blk_addr - 1 || |
458e6197 JK |
195 | io->fio.rw != fio->rw)) |
196 | __submit_merged_bio(io); | |
93dfe2ac JK |
197 | alloc_new: |
198 | if (io->bio == NULL) { | |
199 | bio_blocks = MAX_BIO_BLOCKS(max_hw_blocks(sbi)); | |
200 | io->bio = __bio_alloc(bdev, bio_blocks); | |
201 | io->bio->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr); | |
458e6197 | 202 | io->bio->bi_end_io = is_read_io(fio->rw) ? f2fs_read_end_io : |
93dfe2ac | 203 | f2fs_write_end_io; |
458e6197 | 204 | io->fio = *fio; |
93dfe2ac JK |
205 | /* |
206 | * The end_io will be assigned at the sumbission phase. | |
207 | * Until then, let bio_add_page() merge consecutive IOs as much | |
208 | * as possible. | |
209 | */ | |
210 | } | |
211 | ||
212 | if (bio_add_page(io->bio, page, PAGE_CACHE_SIZE, 0) < | |
213 | PAGE_CACHE_SIZE) { | |
458e6197 | 214 | __submit_merged_bio(io); |
93dfe2ac JK |
215 | goto alloc_new; |
216 | } | |
217 | ||
218 | io->last_block_in_bio = blk_addr; | |
219 | ||
220 | mutex_unlock(&io->io_mutex); | |
458e6197 | 221 | trace_f2fs_submit_page_mbio(page, fio->rw, fio->type, blk_addr); |
93dfe2ac JK |
222 | } |
223 | ||
0a8165d7 | 224 | /* |
eb47b800 JK |
225 | * Lock ordering for the change of data block address: |
226 | * ->data_page | |
227 | * ->node_page | |
228 | * update block addresses in the node page | |
229 | */ | |
230 | static void __set_data_blkaddr(struct dnode_of_data *dn, block_t new_addr) | |
231 | { | |
232 | struct f2fs_node *rn; | |
233 | __le32 *addr_array; | |
234 | struct page *node_page = dn->node_page; | |
235 | unsigned int ofs_in_node = dn->ofs_in_node; | |
236 | ||
a569469e | 237 | f2fs_wait_on_page_writeback(node_page, NODE, false); |
eb47b800 | 238 | |
45590710 | 239 | rn = F2FS_NODE(node_page); |
eb47b800 JK |
240 | |
241 | /* Get physical address of data block */ | |
242 | addr_array = blkaddr_in_node(rn); | |
243 | addr_array[ofs_in_node] = cpu_to_le32(new_addr); | |
244 | set_page_dirty(node_page); | |
245 | } | |
246 | ||
247 | int reserve_new_block(struct dnode_of_data *dn) | |
248 | { | |
249 | struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb); | |
250 | ||
6bacf52f | 251 | if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC))) |
eb47b800 | 252 | return -EPERM; |
cfb271d4 | 253 | if (unlikely(!inc_valid_block_count(sbi, dn->inode, 1))) |
eb47b800 JK |
254 | return -ENOSPC; |
255 | ||
c01e2853 NJ |
256 | trace_f2fs_reserve_new_block(dn->inode, dn->nid, dn->ofs_in_node); |
257 | ||
eb47b800 JK |
258 | __set_data_blkaddr(dn, NEW_ADDR); |
259 | dn->data_blkaddr = NEW_ADDR; | |
260 | sync_inode_page(dn); | |
261 | return 0; | |
262 | } | |
263 | ||
b600965c HL |
264 | int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index) |
265 | { | |
266 | bool need_put = dn->inode_page ? false : true; | |
267 | int err; | |
268 | ||
269 | err = get_dnode_of_data(dn, index, ALLOC_NODE); | |
270 | if (err) | |
271 | return err; | |
272 | if (dn->data_blkaddr == NULL_ADDR) | |
273 | err = reserve_new_block(dn); | |
274 | ||
275 | if (need_put) | |
276 | f2fs_put_dnode(dn); | |
277 | return err; | |
278 | } | |
279 | ||
eb47b800 JK |
280 | static int check_extent_cache(struct inode *inode, pgoff_t pgofs, |
281 | struct buffer_head *bh_result) | |
282 | { | |
283 | struct f2fs_inode_info *fi = F2FS_I(inode); | |
eb47b800 JK |
284 | pgoff_t start_fofs, end_fofs; |
285 | block_t start_blkaddr; | |
286 | ||
c11abd1a JK |
287 | if (is_inode_flag_set(fi, FI_NO_EXTENT)) |
288 | return 0; | |
289 | ||
eb47b800 JK |
290 | read_lock(&fi->ext.ext_lock); |
291 | if (fi->ext.len == 0) { | |
292 | read_unlock(&fi->ext.ext_lock); | |
293 | return 0; | |
294 | } | |
295 | ||
dcdfff65 JK |
296 | stat_inc_total_hit(inode->i_sb); |
297 | ||
eb47b800 JK |
298 | start_fofs = fi->ext.fofs; |
299 | end_fofs = fi->ext.fofs + fi->ext.len - 1; | |
300 | start_blkaddr = fi->ext.blk_addr; | |
301 | ||
302 | if (pgofs >= start_fofs && pgofs <= end_fofs) { | |
303 | unsigned int blkbits = inode->i_sb->s_blocksize_bits; | |
304 | size_t count; | |
305 | ||
306 | clear_buffer_new(bh_result); | |
307 | map_bh(bh_result, inode->i_sb, | |
308 | start_blkaddr + pgofs - start_fofs); | |
309 | count = end_fofs - pgofs + 1; | |
310 | if (count < (UINT_MAX >> blkbits)) | |
311 | bh_result->b_size = (count << blkbits); | |
312 | else | |
313 | bh_result->b_size = UINT_MAX; | |
314 | ||
dcdfff65 | 315 | stat_inc_read_hit(inode->i_sb); |
eb47b800 JK |
316 | read_unlock(&fi->ext.ext_lock); |
317 | return 1; | |
318 | } | |
319 | read_unlock(&fi->ext.ext_lock); | |
320 | return 0; | |
321 | } | |
322 | ||
323 | void update_extent_cache(block_t blk_addr, struct dnode_of_data *dn) | |
324 | { | |
325 | struct f2fs_inode_info *fi = F2FS_I(dn->inode); | |
326 | pgoff_t fofs, start_fofs, end_fofs; | |
327 | block_t start_blkaddr, end_blkaddr; | |
c11abd1a | 328 | int need_update = true; |
eb47b800 | 329 | |
5d56b671 | 330 | f2fs_bug_on(blk_addr == NEW_ADDR); |
de93653f JK |
331 | fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) + |
332 | dn->ofs_in_node; | |
eb47b800 JK |
333 | |
334 | /* Update the page address in the parent node */ | |
335 | __set_data_blkaddr(dn, blk_addr); | |
336 | ||
c11abd1a JK |
337 | if (is_inode_flag_set(fi, FI_NO_EXTENT)) |
338 | return; | |
339 | ||
eb47b800 JK |
340 | write_lock(&fi->ext.ext_lock); |
341 | ||
342 | start_fofs = fi->ext.fofs; | |
343 | end_fofs = fi->ext.fofs + fi->ext.len - 1; | |
344 | start_blkaddr = fi->ext.blk_addr; | |
345 | end_blkaddr = fi->ext.blk_addr + fi->ext.len - 1; | |
346 | ||
347 | /* Drop and initialize the matched extent */ | |
348 | if (fi->ext.len == 1 && fofs == start_fofs) | |
349 | fi->ext.len = 0; | |
350 | ||
351 | /* Initial extent */ | |
352 | if (fi->ext.len == 0) { | |
353 | if (blk_addr != NULL_ADDR) { | |
354 | fi->ext.fofs = fofs; | |
355 | fi->ext.blk_addr = blk_addr; | |
356 | fi->ext.len = 1; | |
357 | } | |
358 | goto end_update; | |
359 | } | |
360 | ||
6224da87 | 361 | /* Front merge */ |
eb47b800 JK |
362 | if (fofs == start_fofs - 1 && blk_addr == start_blkaddr - 1) { |
363 | fi->ext.fofs--; | |
364 | fi->ext.blk_addr--; | |
365 | fi->ext.len++; | |
366 | goto end_update; | |
367 | } | |
368 | ||
369 | /* Back merge */ | |
370 | if (fofs == end_fofs + 1 && blk_addr == end_blkaddr + 1) { | |
371 | fi->ext.len++; | |
372 | goto end_update; | |
373 | } | |
374 | ||
375 | /* Split the existing extent */ | |
376 | if (fi->ext.len > 1 && | |
377 | fofs >= start_fofs && fofs <= end_fofs) { | |
378 | if ((end_fofs - fofs) < (fi->ext.len >> 1)) { | |
379 | fi->ext.len = fofs - start_fofs; | |
380 | } else { | |
381 | fi->ext.fofs = fofs + 1; | |
382 | fi->ext.blk_addr = start_blkaddr + | |
383 | fofs - start_fofs + 1; | |
384 | fi->ext.len -= fofs - start_fofs + 1; | |
385 | } | |
c11abd1a JK |
386 | } else { |
387 | need_update = false; | |
eb47b800 | 388 | } |
eb47b800 | 389 | |
c11abd1a JK |
390 | /* Finally, if the extent is very fragmented, let's drop the cache. */ |
391 | if (fi->ext.len < F2FS_MIN_EXTENT_LEN) { | |
392 | fi->ext.len = 0; | |
393 | set_inode_flag(fi, FI_NO_EXTENT); | |
394 | need_update = true; | |
395 | } | |
eb47b800 JK |
396 | end_update: |
397 | write_unlock(&fi->ext.ext_lock); | |
c11abd1a JK |
398 | if (need_update) |
399 | sync_inode_page(dn); | |
400 | return; | |
eb47b800 JK |
401 | } |
402 | ||
c718379b | 403 | struct page *find_data_page(struct inode *inode, pgoff_t index, bool sync) |
eb47b800 JK |
404 | { |
405 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
406 | struct address_space *mapping = inode->i_mapping; | |
407 | struct dnode_of_data dn; | |
408 | struct page *page; | |
409 | int err; | |
410 | ||
411 | page = find_get_page(mapping, index); | |
412 | if (page && PageUptodate(page)) | |
413 | return page; | |
414 | f2fs_put_page(page, 0); | |
415 | ||
416 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 417 | err = get_dnode_of_data(&dn, index, LOOKUP_NODE); |
eb47b800 JK |
418 | if (err) |
419 | return ERR_PTR(err); | |
420 | f2fs_put_dnode(&dn); | |
421 | ||
422 | if (dn.data_blkaddr == NULL_ADDR) | |
423 | return ERR_PTR(-ENOENT); | |
424 | ||
425 | /* By fallocate(), there is no cached page, but with NEW_ADDR */ | |
6bacf52f | 426 | if (unlikely(dn.data_blkaddr == NEW_ADDR)) |
eb47b800 JK |
427 | return ERR_PTR(-EINVAL); |
428 | ||
6f85b352 | 429 | page = grab_cache_page_write_begin(mapping, index, AOP_FLAG_NOFS); |
eb47b800 JK |
430 | if (!page) |
431 | return ERR_PTR(-ENOMEM); | |
432 | ||
393ff91f JK |
433 | if (PageUptodate(page)) { |
434 | unlock_page(page); | |
435 | return page; | |
436 | } | |
437 | ||
93dfe2ac | 438 | err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr, |
c718379b | 439 | sync ? READ_SYNC : READA); |
1069bbf7 CY |
440 | if (err) |
441 | return ERR_PTR(err); | |
442 | ||
c718379b JK |
443 | if (sync) { |
444 | wait_on_page_locked(page); | |
6bacf52f | 445 | if (unlikely(!PageUptodate(page))) { |
c718379b JK |
446 | f2fs_put_page(page, 0); |
447 | return ERR_PTR(-EIO); | |
448 | } | |
eb47b800 | 449 | } |
eb47b800 JK |
450 | return page; |
451 | } | |
452 | ||
0a8165d7 | 453 | /* |
eb47b800 JK |
454 | * If it tries to access a hole, return an error. |
455 | * Because, the callers, functions in dir.c and GC, should be able to know | |
456 | * whether this page exists or not. | |
457 | */ | |
458 | struct page *get_lock_data_page(struct inode *inode, pgoff_t index) | |
459 | { | |
460 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
461 | struct address_space *mapping = inode->i_mapping; | |
462 | struct dnode_of_data dn; | |
463 | struct page *page; | |
464 | int err; | |
465 | ||
650495de | 466 | repeat: |
6f85b352 | 467 | page = grab_cache_page_write_begin(mapping, index, AOP_FLAG_NOFS); |
650495de JK |
468 | if (!page) |
469 | return ERR_PTR(-ENOMEM); | |
470 | ||
eb47b800 | 471 | set_new_dnode(&dn, inode, NULL, NULL, 0); |
266e97a8 | 472 | err = get_dnode_of_data(&dn, index, LOOKUP_NODE); |
650495de JK |
473 | if (err) { |
474 | f2fs_put_page(page, 1); | |
eb47b800 | 475 | return ERR_PTR(err); |
650495de | 476 | } |
eb47b800 JK |
477 | f2fs_put_dnode(&dn); |
478 | ||
6bacf52f | 479 | if (unlikely(dn.data_blkaddr == NULL_ADDR)) { |
650495de | 480 | f2fs_put_page(page, 1); |
eb47b800 | 481 | return ERR_PTR(-ENOENT); |
650495de | 482 | } |
eb47b800 JK |
483 | |
484 | if (PageUptodate(page)) | |
485 | return page; | |
486 | ||
d59ff4df JK |
487 | /* |
488 | * A new dentry page is allocated but not able to be written, since its | |
489 | * new inode page couldn't be allocated due to -ENOSPC. | |
490 | * In such the case, its blkaddr can be remained as NEW_ADDR. | |
491 | * see, f2fs_add_link -> get_new_data_page -> init_inode_metadata. | |
492 | */ | |
493 | if (dn.data_blkaddr == NEW_ADDR) { | |
494 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
495 | SetPageUptodate(page); | |
496 | return page; | |
497 | } | |
eb47b800 | 498 | |
93dfe2ac | 499 | err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr, READ_SYNC); |
393ff91f | 500 | if (err) |
eb47b800 | 501 | return ERR_PTR(err); |
393ff91f JK |
502 | |
503 | lock_page(page); | |
6bacf52f | 504 | if (unlikely(!PageUptodate(page))) { |
393ff91f JK |
505 | f2fs_put_page(page, 1); |
506 | return ERR_PTR(-EIO); | |
eb47b800 | 507 | } |
6bacf52f | 508 | if (unlikely(page->mapping != mapping)) { |
afcb7ca0 JK |
509 | f2fs_put_page(page, 1); |
510 | goto repeat; | |
eb47b800 JK |
511 | } |
512 | return page; | |
513 | } | |
514 | ||
0a8165d7 | 515 | /* |
eb47b800 JK |
516 | * Caller ensures that this data page is never allocated. |
517 | * A new zero-filled data page is allocated in the page cache. | |
39936837 JK |
518 | * |
519 | * Also, caller should grab and release a mutex by calling mutex_lock_op() and | |
520 | * mutex_unlock_op(). | |
44a83ff6 | 521 | * Note that, npage is set only by make_empty_dir. |
eb47b800 | 522 | */ |
64aa7ed9 JK |
523 | struct page *get_new_data_page(struct inode *inode, |
524 | struct page *npage, pgoff_t index, bool new_i_size) | |
eb47b800 JK |
525 | { |
526 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
527 | struct address_space *mapping = inode->i_mapping; | |
528 | struct page *page; | |
529 | struct dnode_of_data dn; | |
530 | int err; | |
531 | ||
64aa7ed9 | 532 | set_new_dnode(&dn, inode, npage, npage, 0); |
b600965c | 533 | err = f2fs_reserve_block(&dn, index); |
eb47b800 JK |
534 | if (err) |
535 | return ERR_PTR(err); | |
afcb7ca0 | 536 | repeat: |
eb47b800 JK |
537 | page = grab_cache_page(mapping, index); |
538 | if (!page) | |
539 | return ERR_PTR(-ENOMEM); | |
540 | ||
541 | if (PageUptodate(page)) | |
542 | return page; | |
543 | ||
544 | if (dn.data_blkaddr == NEW_ADDR) { | |
545 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
393ff91f | 546 | SetPageUptodate(page); |
eb47b800 | 547 | } else { |
93dfe2ac JK |
548 | err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr, |
549 | READ_SYNC); | |
393ff91f | 550 | if (err) |
eb47b800 | 551 | return ERR_PTR(err); |
393ff91f | 552 | lock_page(page); |
6bacf52f | 553 | if (unlikely(!PageUptodate(page))) { |
393ff91f JK |
554 | f2fs_put_page(page, 1); |
555 | return ERR_PTR(-EIO); | |
eb47b800 | 556 | } |
6bacf52f | 557 | if (unlikely(page->mapping != mapping)) { |
afcb7ca0 JK |
558 | f2fs_put_page(page, 1); |
559 | goto repeat; | |
eb47b800 JK |
560 | } |
561 | } | |
eb47b800 JK |
562 | |
563 | if (new_i_size && | |
564 | i_size_read(inode) < ((index + 1) << PAGE_CACHE_SHIFT)) { | |
565 | i_size_write(inode, ((index + 1) << PAGE_CACHE_SHIFT)); | |
699489bb JK |
566 | /* Only the directory inode sets new_i_size */ |
567 | set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR); | |
eb47b800 JK |
568 | mark_inode_dirty_sync(inode); |
569 | } | |
570 | return page; | |
571 | } | |
572 | ||
0a8165d7 | 573 | /* |
eb47b800 JK |
574 | * This function should be used by the data read flow only where it |
575 | * does not check the "create" flag that indicates block allocation. | |
576 | * The reason for this special functionality is to exploit VFS readahead | |
577 | * mechanism. | |
578 | */ | |
579 | static int get_data_block_ro(struct inode *inode, sector_t iblock, | |
580 | struct buffer_head *bh_result, int create) | |
581 | { | |
582 | unsigned int blkbits = inode->i_sb->s_blocksize_bits; | |
583 | unsigned maxblocks = bh_result->b_size >> blkbits; | |
584 | struct dnode_of_data dn; | |
585 | pgoff_t pgofs; | |
586 | int err; | |
587 | ||
588 | /* Get the page offset from the block offset(iblock) */ | |
589 | pgofs = (pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits)); | |
590 | ||
848753aa NJ |
591 | if (check_extent_cache(inode, pgofs, bh_result)) { |
592 | trace_f2fs_get_data_block(inode, iblock, bh_result, 0); | |
eb47b800 | 593 | return 0; |
848753aa | 594 | } |
eb47b800 JK |
595 | |
596 | /* When reading holes, we need its node page */ | |
597 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 598 | err = get_dnode_of_data(&dn, pgofs, LOOKUP_NODE_RA); |
848753aa NJ |
599 | if (err) { |
600 | trace_f2fs_get_data_block(inode, iblock, bh_result, err); | |
eb47b800 | 601 | return (err == -ENOENT) ? 0 : err; |
848753aa | 602 | } |
eb47b800 JK |
603 | |
604 | /* It does not support data allocation */ | |
5d56b671 | 605 | f2fs_bug_on(create); |
eb47b800 JK |
606 | |
607 | if (dn.data_blkaddr != NEW_ADDR && dn.data_blkaddr != NULL_ADDR) { | |
608 | int i; | |
609 | unsigned int end_offset; | |
610 | ||
611 | end_offset = IS_INODE(dn.node_page) ? | |
de93653f | 612 | ADDRS_PER_INODE(F2FS_I(inode)) : |
eb47b800 JK |
613 | ADDRS_PER_BLOCK; |
614 | ||
615 | clear_buffer_new(bh_result); | |
616 | ||
617 | /* Give more consecutive addresses for the read ahead */ | |
618 | for (i = 0; i < end_offset - dn.ofs_in_node; i++) | |
619 | if (((datablock_addr(dn.node_page, | |
620 | dn.ofs_in_node + i)) | |
621 | != (dn.data_blkaddr + i)) || maxblocks == i) | |
622 | break; | |
623 | map_bh(bh_result, inode->i_sb, dn.data_blkaddr); | |
f9a4e6df | 624 | bh_result->b_size = (((size_t)i) << blkbits); |
eb47b800 JK |
625 | } |
626 | f2fs_put_dnode(&dn); | |
848753aa | 627 | trace_f2fs_get_data_block(inode, iblock, bh_result, 0); |
eb47b800 JK |
628 | return 0; |
629 | } | |
630 | ||
631 | static int f2fs_read_data_page(struct file *file, struct page *page) | |
632 | { | |
633 | return mpage_readpage(page, get_data_block_ro); | |
634 | } | |
635 | ||
636 | static int f2fs_read_data_pages(struct file *file, | |
637 | struct address_space *mapping, | |
638 | struct list_head *pages, unsigned nr_pages) | |
639 | { | |
640 | return mpage_readpages(mapping, pages, nr_pages, get_data_block_ro); | |
641 | } | |
642 | ||
458e6197 | 643 | int do_write_data_page(struct page *page, struct f2fs_io_info *fio) |
eb47b800 JK |
644 | { |
645 | struct inode *inode = page->mapping->host; | |
458e6197 | 646 | block_t old_blkaddr, new_blkaddr; |
eb47b800 JK |
647 | struct dnode_of_data dn; |
648 | int err = 0; | |
649 | ||
650 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 651 | err = get_dnode_of_data(&dn, page->index, LOOKUP_NODE); |
eb47b800 JK |
652 | if (err) |
653 | return err; | |
654 | ||
458e6197 | 655 | old_blkaddr = dn.data_blkaddr; |
eb47b800 JK |
656 | |
657 | /* This page is already truncated */ | |
458e6197 | 658 | if (old_blkaddr == NULL_ADDR) |
eb47b800 JK |
659 | goto out_writepage; |
660 | ||
661 | set_page_writeback(page); | |
662 | ||
663 | /* | |
664 | * If current allocation needs SSR, | |
665 | * it had better in-place writes for updated data. | |
666 | */ | |
458e6197 | 667 | if (unlikely(old_blkaddr != NEW_ADDR && |
b25958b6 HL |
668 | !is_cold_data(page) && |
669 | need_inplace_update(inode))) { | |
458e6197 | 670 | rewrite_data_page(page, old_blkaddr, fio); |
eb47b800 | 671 | } else { |
458e6197 JK |
672 | write_data_page(page, &dn, &new_blkaddr, fio); |
673 | update_extent_cache(new_blkaddr, &dn); | |
eb47b800 JK |
674 | } |
675 | out_writepage: | |
676 | f2fs_put_dnode(&dn); | |
677 | return err; | |
678 | } | |
679 | ||
680 | static int f2fs_write_data_page(struct page *page, | |
681 | struct writeback_control *wbc) | |
682 | { | |
683 | struct inode *inode = page->mapping->host; | |
684 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
685 | loff_t i_size = i_size_read(inode); | |
686 | const pgoff_t end_index = ((unsigned long long) i_size) | |
687 | >> PAGE_CACHE_SHIFT; | |
688 | unsigned offset; | |
39936837 | 689 | bool need_balance_fs = false; |
eb47b800 | 690 | int err = 0; |
458e6197 JK |
691 | struct f2fs_io_info fio = { |
692 | .type = DATA, | |
693 | .rw = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC: WRITE, | |
694 | .rw_flag = 0, | |
695 | }; | |
eb47b800 JK |
696 | |
697 | if (page->index < end_index) | |
39936837 | 698 | goto write; |
eb47b800 JK |
699 | |
700 | /* | |
701 | * If the offset is out-of-range of file size, | |
702 | * this page does not have to be written to disk. | |
703 | */ | |
704 | offset = i_size & (PAGE_CACHE_SIZE - 1); | |
705 | if ((page->index >= end_index + 1) || !offset) { | |
706 | if (S_ISDIR(inode->i_mode)) { | |
707 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
708 | inode_dec_dirty_dents(inode); | |
709 | } | |
39936837 | 710 | goto out; |
eb47b800 JK |
711 | } |
712 | ||
713 | zero_user_segment(page, offset, PAGE_CACHE_SIZE); | |
39936837 | 714 | write: |
cfb271d4 | 715 | if (unlikely(sbi->por_doing)) { |
39936837 | 716 | err = AOP_WRITEPAGE_ACTIVATE; |
eb47b800 | 717 | goto redirty_out; |
39936837 | 718 | } |
eb47b800 | 719 | |
39936837 | 720 | /* Dentry blocks are controlled by checkpoint */ |
eb47b800 JK |
721 | if (S_ISDIR(inode->i_mode)) { |
722 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
723 | inode_dec_dirty_dents(inode); | |
458e6197 | 724 | err = do_write_data_page(page, &fio); |
39936837 | 725 | } else { |
e479556b | 726 | f2fs_lock_op(sbi); |
458e6197 | 727 | err = do_write_data_page(page, &fio); |
e479556b | 728 | f2fs_unlock_op(sbi); |
39936837 | 729 | need_balance_fs = true; |
eb47b800 | 730 | } |
39936837 JK |
731 | if (err == -ENOENT) |
732 | goto out; | |
733 | else if (err) | |
734 | goto redirty_out; | |
eb47b800 JK |
735 | |
736 | if (wbc->for_reclaim) | |
458e6197 | 737 | f2fs_submit_merged_bio(sbi, DATA, WRITE); |
eb47b800 | 738 | |
eb47b800 | 739 | clear_cold_data(page); |
39936837 | 740 | out: |
eb47b800 | 741 | unlock_page(page); |
39936837 | 742 | if (need_balance_fs) |
eb47b800 JK |
743 | f2fs_balance_fs(sbi); |
744 | return 0; | |
745 | ||
eb47b800 JK |
746 | redirty_out: |
747 | wbc->pages_skipped++; | |
748 | set_page_dirty(page); | |
39936837 | 749 | return err; |
eb47b800 JK |
750 | } |
751 | ||
752 | #define MAX_DESIRED_PAGES_WP 4096 | |
753 | ||
fa9150a8 NJ |
754 | static int __f2fs_writepage(struct page *page, struct writeback_control *wbc, |
755 | void *data) | |
756 | { | |
757 | struct address_space *mapping = data; | |
758 | int ret = mapping->a_ops->writepage(page, wbc); | |
759 | mapping_set_error(mapping, ret); | |
760 | return ret; | |
761 | } | |
762 | ||
25ca923b | 763 | static int f2fs_write_data_pages(struct address_space *mapping, |
eb47b800 JK |
764 | struct writeback_control *wbc) |
765 | { | |
766 | struct inode *inode = mapping->host; | |
767 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
531ad7d5 | 768 | bool locked = false; |
eb47b800 JK |
769 | int ret; |
770 | long excess_nrtw = 0, desired_nrtw; | |
771 | ||
cfb185a1 | 772 | /* deal with chardevs and other special file */ |
773 | if (!mapping->a_ops->writepage) | |
774 | return 0; | |
775 | ||
eb47b800 JK |
776 | if (wbc->nr_to_write < MAX_DESIRED_PAGES_WP) { |
777 | desired_nrtw = MAX_DESIRED_PAGES_WP; | |
778 | excess_nrtw = desired_nrtw - wbc->nr_to_write; | |
779 | wbc->nr_to_write = desired_nrtw; | |
780 | } | |
781 | ||
531ad7d5 | 782 | if (!S_ISDIR(inode->i_mode)) { |
eb47b800 | 783 | mutex_lock(&sbi->writepages); |
531ad7d5 JK |
784 | locked = true; |
785 | } | |
fa9150a8 | 786 | ret = write_cache_pages(mapping, wbc, __f2fs_writepage, mapping); |
531ad7d5 | 787 | if (locked) |
eb47b800 | 788 | mutex_unlock(&sbi->writepages); |
458e6197 JK |
789 | |
790 | f2fs_submit_merged_bio(sbi, DATA, WRITE); | |
eb47b800 JK |
791 | |
792 | remove_dirty_dir_inode(inode); | |
793 | ||
794 | wbc->nr_to_write -= excess_nrtw; | |
795 | return ret; | |
796 | } | |
797 | ||
798 | static int f2fs_write_begin(struct file *file, struct address_space *mapping, | |
799 | loff_t pos, unsigned len, unsigned flags, | |
800 | struct page **pagep, void **fsdata) | |
801 | { | |
802 | struct inode *inode = mapping->host; | |
803 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
804 | struct page *page; | |
805 | pgoff_t index = ((unsigned long long) pos) >> PAGE_CACHE_SHIFT; | |
806 | struct dnode_of_data dn; | |
807 | int err = 0; | |
808 | ||
eb47b800 | 809 | f2fs_balance_fs(sbi); |
afcb7ca0 | 810 | repeat: |
eb47b800 JK |
811 | page = grab_cache_page_write_begin(mapping, index, flags); |
812 | if (!page) | |
813 | return -ENOMEM; | |
814 | *pagep = page; | |
815 | ||
e479556b | 816 | f2fs_lock_op(sbi); |
eb47b800 | 817 | set_new_dnode(&dn, inode, NULL, NULL, 0); |
b600965c | 818 | err = f2fs_reserve_block(&dn, index); |
e479556b | 819 | f2fs_unlock_op(sbi); |
eb47b800 | 820 | |
b600965c HL |
821 | if (err) { |
822 | f2fs_put_page(page, 1); | |
823 | return err; | |
824 | } | |
825 | ||
eb47b800 JK |
826 | if ((len == PAGE_CACHE_SIZE) || PageUptodate(page)) |
827 | return 0; | |
828 | ||
829 | if ((pos & PAGE_CACHE_MASK) >= i_size_read(inode)) { | |
830 | unsigned start = pos & (PAGE_CACHE_SIZE - 1); | |
831 | unsigned end = start + len; | |
832 | ||
833 | /* Reading beyond i_size is simple: memset to zero */ | |
834 | zero_user_segments(page, 0, start, end, PAGE_CACHE_SIZE); | |
393ff91f | 835 | goto out; |
eb47b800 JK |
836 | } |
837 | ||
838 | if (dn.data_blkaddr == NEW_ADDR) { | |
839 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
840 | } else { | |
93dfe2ac JK |
841 | err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr, |
842 | READ_SYNC); | |
393ff91f | 843 | if (err) |
eb47b800 | 844 | return err; |
393ff91f | 845 | lock_page(page); |
6bacf52f | 846 | if (unlikely(!PageUptodate(page))) { |
393ff91f JK |
847 | f2fs_put_page(page, 1); |
848 | return -EIO; | |
eb47b800 | 849 | } |
6bacf52f | 850 | if (unlikely(page->mapping != mapping)) { |
afcb7ca0 JK |
851 | f2fs_put_page(page, 1); |
852 | goto repeat; | |
eb47b800 JK |
853 | } |
854 | } | |
393ff91f | 855 | out: |
eb47b800 JK |
856 | SetPageUptodate(page); |
857 | clear_cold_data(page); | |
858 | return 0; | |
859 | } | |
860 | ||
a1dd3c13 JK |
861 | static int f2fs_write_end(struct file *file, |
862 | struct address_space *mapping, | |
863 | loff_t pos, unsigned len, unsigned copied, | |
864 | struct page *page, void *fsdata) | |
865 | { | |
866 | struct inode *inode = page->mapping->host; | |
867 | ||
868 | SetPageUptodate(page); | |
869 | set_page_dirty(page); | |
870 | ||
871 | if (pos + copied > i_size_read(inode)) { | |
872 | i_size_write(inode, pos + copied); | |
873 | mark_inode_dirty(inode); | |
874 | update_inode_page(inode); | |
875 | } | |
876 | ||
75c3c8bc | 877 | f2fs_put_page(page, 1); |
a1dd3c13 JK |
878 | return copied; |
879 | } | |
880 | ||
eb47b800 JK |
881 | static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb, |
882 | const struct iovec *iov, loff_t offset, unsigned long nr_segs) | |
883 | { | |
884 | struct file *file = iocb->ki_filp; | |
885 | struct inode *inode = file->f_mapping->host; | |
886 | ||
887 | if (rw == WRITE) | |
888 | return 0; | |
889 | ||
890 | /* Needs synchronization with the cleaner */ | |
891 | return blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs, | |
892 | get_data_block_ro); | |
893 | } | |
894 | ||
d47992f8 LC |
895 | static void f2fs_invalidate_data_page(struct page *page, unsigned int offset, |
896 | unsigned int length) | |
eb47b800 JK |
897 | { |
898 | struct inode *inode = page->mapping->host; | |
899 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
900 | if (S_ISDIR(inode->i_mode) && PageDirty(page)) { | |
901 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
902 | inode_dec_dirty_dents(inode); | |
903 | } | |
904 | ClearPagePrivate(page); | |
905 | } | |
906 | ||
907 | static int f2fs_release_data_page(struct page *page, gfp_t wait) | |
908 | { | |
909 | ClearPagePrivate(page); | |
c3850aa1 | 910 | return 1; |
eb47b800 JK |
911 | } |
912 | ||
913 | static int f2fs_set_data_page_dirty(struct page *page) | |
914 | { | |
915 | struct address_space *mapping = page->mapping; | |
916 | struct inode *inode = mapping->host; | |
917 | ||
26c6b887 JK |
918 | trace_f2fs_set_page_dirty(page, DATA); |
919 | ||
eb47b800 JK |
920 | SetPageUptodate(page); |
921 | if (!PageDirty(page)) { | |
922 | __set_page_dirty_nobuffers(page); | |
923 | set_dirty_dir_page(inode, page); | |
924 | return 1; | |
925 | } | |
926 | return 0; | |
927 | } | |
928 | ||
c01e54b7 JK |
929 | static sector_t f2fs_bmap(struct address_space *mapping, sector_t block) |
930 | { | |
931 | return generic_block_bmap(mapping, block, get_data_block_ro); | |
932 | } | |
933 | ||
eb47b800 JK |
934 | const struct address_space_operations f2fs_dblock_aops = { |
935 | .readpage = f2fs_read_data_page, | |
936 | .readpages = f2fs_read_data_pages, | |
937 | .writepage = f2fs_write_data_page, | |
938 | .writepages = f2fs_write_data_pages, | |
939 | .write_begin = f2fs_write_begin, | |
a1dd3c13 | 940 | .write_end = f2fs_write_end, |
eb47b800 JK |
941 | .set_page_dirty = f2fs_set_data_page_dirty, |
942 | .invalidatepage = f2fs_invalidate_data_page, | |
943 | .releasepage = f2fs_release_data_page, | |
944 | .direct_IO = f2fs_direct_IO, | |
c01e54b7 | 945 | .bmap = f2fs_bmap, |
eb47b800 | 946 | }; |