Commit | Line | Data |
---|---|---|
0a8165d7 | 1 | /* |
eb47b800 JK |
2 | * fs/f2fs/data.c |
3 | * | |
4 | * Copyright (c) 2012 Samsung Electronics Co., Ltd. | |
5 | * http://www.samsung.com/ | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #include <linux/fs.h> | |
12 | #include <linux/f2fs_fs.h> | |
13 | #include <linux/buffer_head.h> | |
14 | #include <linux/mpage.h> | |
a27bb332 | 15 | #include <linux/aio.h> |
eb47b800 JK |
16 | #include <linux/writeback.h> |
17 | #include <linux/backing-dev.h> | |
18 | #include <linux/blkdev.h> | |
19 | #include <linux/bio.h> | |
690e4a3e | 20 | #include <linux/prefetch.h> |
eb47b800 JK |
21 | |
22 | #include "f2fs.h" | |
23 | #include "node.h" | |
24 | #include "segment.h" | |
848753aa | 25 | #include <trace/events/f2fs.h> |
eb47b800 | 26 | |
0a8165d7 | 27 | /* |
eb47b800 JK |
28 | * Lock ordering for the change of data block address: |
29 | * ->data_page | |
30 | * ->node_page | |
31 | * update block addresses in the node page | |
32 | */ | |
33 | static void __set_data_blkaddr(struct dnode_of_data *dn, block_t new_addr) | |
34 | { | |
35 | struct f2fs_node *rn; | |
36 | __le32 *addr_array; | |
37 | struct page *node_page = dn->node_page; | |
38 | unsigned int ofs_in_node = dn->ofs_in_node; | |
39 | ||
a569469e | 40 | f2fs_wait_on_page_writeback(node_page, NODE, false); |
eb47b800 | 41 | |
45590710 | 42 | rn = F2FS_NODE(node_page); |
eb47b800 JK |
43 | |
44 | /* Get physical address of data block */ | |
45 | addr_array = blkaddr_in_node(rn); | |
46 | addr_array[ofs_in_node] = cpu_to_le32(new_addr); | |
47 | set_page_dirty(node_page); | |
48 | } | |
49 | ||
50 | int reserve_new_block(struct dnode_of_data *dn) | |
51 | { | |
52 | struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb); | |
53 | ||
54 | if (is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)) | |
55 | return -EPERM; | |
56 | if (!inc_valid_block_count(sbi, dn->inode, 1)) | |
57 | return -ENOSPC; | |
58 | ||
c01e2853 NJ |
59 | trace_f2fs_reserve_new_block(dn->inode, dn->nid, dn->ofs_in_node); |
60 | ||
eb47b800 JK |
61 | __set_data_blkaddr(dn, NEW_ADDR); |
62 | dn->data_blkaddr = NEW_ADDR; | |
63 | sync_inode_page(dn); | |
64 | return 0; | |
65 | } | |
66 | ||
b600965c HL |
67 | int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index) |
68 | { | |
69 | bool need_put = dn->inode_page ? false : true; | |
70 | int err; | |
71 | ||
72 | err = get_dnode_of_data(dn, index, ALLOC_NODE); | |
73 | if (err) | |
74 | return err; | |
75 | if (dn->data_blkaddr == NULL_ADDR) | |
76 | err = reserve_new_block(dn); | |
77 | ||
78 | if (need_put) | |
79 | f2fs_put_dnode(dn); | |
80 | return err; | |
81 | } | |
82 | ||
eb47b800 JK |
83 | static int check_extent_cache(struct inode *inode, pgoff_t pgofs, |
84 | struct buffer_head *bh_result) | |
85 | { | |
86 | struct f2fs_inode_info *fi = F2FS_I(inode); | |
eb47b800 JK |
87 | pgoff_t start_fofs, end_fofs; |
88 | block_t start_blkaddr; | |
89 | ||
c11abd1a JK |
90 | if (is_inode_flag_set(fi, FI_NO_EXTENT)) |
91 | return 0; | |
92 | ||
eb47b800 JK |
93 | read_lock(&fi->ext.ext_lock); |
94 | if (fi->ext.len == 0) { | |
95 | read_unlock(&fi->ext.ext_lock); | |
96 | return 0; | |
97 | } | |
98 | ||
dcdfff65 JK |
99 | stat_inc_total_hit(inode->i_sb); |
100 | ||
eb47b800 JK |
101 | start_fofs = fi->ext.fofs; |
102 | end_fofs = fi->ext.fofs + fi->ext.len - 1; | |
103 | start_blkaddr = fi->ext.blk_addr; | |
104 | ||
105 | if (pgofs >= start_fofs && pgofs <= end_fofs) { | |
106 | unsigned int blkbits = inode->i_sb->s_blocksize_bits; | |
107 | size_t count; | |
108 | ||
109 | clear_buffer_new(bh_result); | |
110 | map_bh(bh_result, inode->i_sb, | |
111 | start_blkaddr + pgofs - start_fofs); | |
112 | count = end_fofs - pgofs + 1; | |
113 | if (count < (UINT_MAX >> blkbits)) | |
114 | bh_result->b_size = (count << blkbits); | |
115 | else | |
116 | bh_result->b_size = UINT_MAX; | |
117 | ||
dcdfff65 | 118 | stat_inc_read_hit(inode->i_sb); |
eb47b800 JK |
119 | read_unlock(&fi->ext.ext_lock); |
120 | return 1; | |
121 | } | |
122 | read_unlock(&fi->ext.ext_lock); | |
123 | return 0; | |
124 | } | |
125 | ||
126 | void update_extent_cache(block_t blk_addr, struct dnode_of_data *dn) | |
127 | { | |
128 | struct f2fs_inode_info *fi = F2FS_I(dn->inode); | |
129 | pgoff_t fofs, start_fofs, end_fofs; | |
130 | block_t start_blkaddr, end_blkaddr; | |
c11abd1a | 131 | int need_update = true; |
eb47b800 | 132 | |
5d56b671 | 133 | f2fs_bug_on(blk_addr == NEW_ADDR); |
de93653f JK |
134 | fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) + |
135 | dn->ofs_in_node; | |
eb47b800 JK |
136 | |
137 | /* Update the page address in the parent node */ | |
138 | __set_data_blkaddr(dn, blk_addr); | |
139 | ||
c11abd1a JK |
140 | if (is_inode_flag_set(fi, FI_NO_EXTENT)) |
141 | return; | |
142 | ||
eb47b800 JK |
143 | write_lock(&fi->ext.ext_lock); |
144 | ||
145 | start_fofs = fi->ext.fofs; | |
146 | end_fofs = fi->ext.fofs + fi->ext.len - 1; | |
147 | start_blkaddr = fi->ext.blk_addr; | |
148 | end_blkaddr = fi->ext.blk_addr + fi->ext.len - 1; | |
149 | ||
150 | /* Drop and initialize the matched extent */ | |
151 | if (fi->ext.len == 1 && fofs == start_fofs) | |
152 | fi->ext.len = 0; | |
153 | ||
154 | /* Initial extent */ | |
155 | if (fi->ext.len == 0) { | |
156 | if (blk_addr != NULL_ADDR) { | |
157 | fi->ext.fofs = fofs; | |
158 | fi->ext.blk_addr = blk_addr; | |
159 | fi->ext.len = 1; | |
160 | } | |
161 | goto end_update; | |
162 | } | |
163 | ||
6224da87 | 164 | /* Front merge */ |
eb47b800 JK |
165 | if (fofs == start_fofs - 1 && blk_addr == start_blkaddr - 1) { |
166 | fi->ext.fofs--; | |
167 | fi->ext.blk_addr--; | |
168 | fi->ext.len++; | |
169 | goto end_update; | |
170 | } | |
171 | ||
172 | /* Back merge */ | |
173 | if (fofs == end_fofs + 1 && blk_addr == end_blkaddr + 1) { | |
174 | fi->ext.len++; | |
175 | goto end_update; | |
176 | } | |
177 | ||
178 | /* Split the existing extent */ | |
179 | if (fi->ext.len > 1 && | |
180 | fofs >= start_fofs && fofs <= end_fofs) { | |
181 | if ((end_fofs - fofs) < (fi->ext.len >> 1)) { | |
182 | fi->ext.len = fofs - start_fofs; | |
183 | } else { | |
184 | fi->ext.fofs = fofs + 1; | |
185 | fi->ext.blk_addr = start_blkaddr + | |
186 | fofs - start_fofs + 1; | |
187 | fi->ext.len -= fofs - start_fofs + 1; | |
188 | } | |
c11abd1a JK |
189 | } else { |
190 | need_update = false; | |
eb47b800 | 191 | } |
eb47b800 | 192 | |
c11abd1a JK |
193 | /* Finally, if the extent is very fragmented, let's drop the cache. */ |
194 | if (fi->ext.len < F2FS_MIN_EXTENT_LEN) { | |
195 | fi->ext.len = 0; | |
196 | set_inode_flag(fi, FI_NO_EXTENT); | |
197 | need_update = true; | |
198 | } | |
eb47b800 JK |
199 | end_update: |
200 | write_unlock(&fi->ext.ext_lock); | |
c11abd1a JK |
201 | if (need_update) |
202 | sync_inode_page(dn); | |
203 | return; | |
eb47b800 JK |
204 | } |
205 | ||
c718379b | 206 | struct page *find_data_page(struct inode *inode, pgoff_t index, bool sync) |
eb47b800 JK |
207 | { |
208 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
209 | struct address_space *mapping = inode->i_mapping; | |
210 | struct dnode_of_data dn; | |
211 | struct page *page; | |
212 | int err; | |
213 | ||
214 | page = find_get_page(mapping, index); | |
215 | if (page && PageUptodate(page)) | |
216 | return page; | |
217 | f2fs_put_page(page, 0); | |
218 | ||
219 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 220 | err = get_dnode_of_data(&dn, index, LOOKUP_NODE); |
eb47b800 JK |
221 | if (err) |
222 | return ERR_PTR(err); | |
223 | f2fs_put_dnode(&dn); | |
224 | ||
225 | if (dn.data_blkaddr == NULL_ADDR) | |
226 | return ERR_PTR(-ENOENT); | |
227 | ||
228 | /* By fallocate(), there is no cached page, but with NEW_ADDR */ | |
229 | if (dn.data_blkaddr == NEW_ADDR) | |
230 | return ERR_PTR(-EINVAL); | |
231 | ||
6f85b352 | 232 | page = grab_cache_page_write_begin(mapping, index, AOP_FLAG_NOFS); |
eb47b800 JK |
233 | if (!page) |
234 | return ERR_PTR(-ENOMEM); | |
235 | ||
393ff91f JK |
236 | if (PageUptodate(page)) { |
237 | unlock_page(page); | |
238 | return page; | |
239 | } | |
240 | ||
c718379b JK |
241 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, |
242 | sync ? READ_SYNC : READA); | |
1069bbf7 CY |
243 | if (err) |
244 | return ERR_PTR(err); | |
245 | ||
c718379b JK |
246 | if (sync) { |
247 | wait_on_page_locked(page); | |
248 | if (!PageUptodate(page)) { | |
249 | f2fs_put_page(page, 0); | |
250 | return ERR_PTR(-EIO); | |
251 | } | |
eb47b800 | 252 | } |
eb47b800 JK |
253 | return page; |
254 | } | |
255 | ||
0a8165d7 | 256 | /* |
eb47b800 JK |
257 | * If it tries to access a hole, return an error. |
258 | * Because, the callers, functions in dir.c and GC, should be able to know | |
259 | * whether this page exists or not. | |
260 | */ | |
261 | struct page *get_lock_data_page(struct inode *inode, pgoff_t index) | |
262 | { | |
263 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
264 | struct address_space *mapping = inode->i_mapping; | |
265 | struct dnode_of_data dn; | |
266 | struct page *page; | |
267 | int err; | |
268 | ||
650495de | 269 | repeat: |
6f85b352 | 270 | page = grab_cache_page_write_begin(mapping, index, AOP_FLAG_NOFS); |
650495de JK |
271 | if (!page) |
272 | return ERR_PTR(-ENOMEM); | |
273 | ||
eb47b800 | 274 | set_new_dnode(&dn, inode, NULL, NULL, 0); |
266e97a8 | 275 | err = get_dnode_of_data(&dn, index, LOOKUP_NODE); |
650495de JK |
276 | if (err) { |
277 | f2fs_put_page(page, 1); | |
eb47b800 | 278 | return ERR_PTR(err); |
650495de | 279 | } |
eb47b800 JK |
280 | f2fs_put_dnode(&dn); |
281 | ||
650495de JK |
282 | if (dn.data_blkaddr == NULL_ADDR) { |
283 | f2fs_put_page(page, 1); | |
eb47b800 | 284 | return ERR_PTR(-ENOENT); |
650495de | 285 | } |
eb47b800 JK |
286 | |
287 | if (PageUptodate(page)) | |
288 | return page; | |
289 | ||
d59ff4df JK |
290 | /* |
291 | * A new dentry page is allocated but not able to be written, since its | |
292 | * new inode page couldn't be allocated due to -ENOSPC. | |
293 | * In such the case, its blkaddr can be remained as NEW_ADDR. | |
294 | * see, f2fs_add_link -> get_new_data_page -> init_inode_metadata. | |
295 | */ | |
296 | if (dn.data_blkaddr == NEW_ADDR) { | |
297 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
298 | SetPageUptodate(page); | |
299 | return page; | |
300 | } | |
eb47b800 JK |
301 | |
302 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
393ff91f | 303 | if (err) |
eb47b800 | 304 | return ERR_PTR(err); |
393ff91f JK |
305 | |
306 | lock_page(page); | |
307 | if (!PageUptodate(page)) { | |
308 | f2fs_put_page(page, 1); | |
309 | return ERR_PTR(-EIO); | |
eb47b800 | 310 | } |
afcb7ca0 JK |
311 | if (page->mapping != mapping) { |
312 | f2fs_put_page(page, 1); | |
313 | goto repeat; | |
eb47b800 JK |
314 | } |
315 | return page; | |
316 | } | |
317 | ||
0a8165d7 | 318 | /* |
eb47b800 JK |
319 | * Caller ensures that this data page is never allocated. |
320 | * A new zero-filled data page is allocated in the page cache. | |
39936837 JK |
321 | * |
322 | * Also, caller should grab and release a mutex by calling mutex_lock_op() and | |
323 | * mutex_unlock_op(). | |
44a83ff6 | 324 | * Note that, npage is set only by make_empty_dir. |
eb47b800 | 325 | */ |
64aa7ed9 JK |
326 | struct page *get_new_data_page(struct inode *inode, |
327 | struct page *npage, pgoff_t index, bool new_i_size) | |
eb47b800 JK |
328 | { |
329 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
330 | struct address_space *mapping = inode->i_mapping; | |
331 | struct page *page; | |
332 | struct dnode_of_data dn; | |
333 | int err; | |
334 | ||
64aa7ed9 | 335 | set_new_dnode(&dn, inode, npage, npage, 0); |
b600965c | 336 | err = f2fs_reserve_block(&dn, index); |
eb47b800 JK |
337 | if (err) |
338 | return ERR_PTR(err); | |
339 | ||
afcb7ca0 | 340 | repeat: |
eb47b800 JK |
341 | page = grab_cache_page(mapping, index); |
342 | if (!page) | |
343 | return ERR_PTR(-ENOMEM); | |
344 | ||
345 | if (PageUptodate(page)) | |
346 | return page; | |
347 | ||
348 | if (dn.data_blkaddr == NEW_ADDR) { | |
349 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
393ff91f | 350 | SetPageUptodate(page); |
eb47b800 JK |
351 | } else { |
352 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
393ff91f | 353 | if (err) |
eb47b800 | 354 | return ERR_PTR(err); |
393ff91f JK |
355 | lock_page(page); |
356 | if (!PageUptodate(page)) { | |
357 | f2fs_put_page(page, 1); | |
358 | return ERR_PTR(-EIO); | |
eb47b800 | 359 | } |
afcb7ca0 JK |
360 | if (page->mapping != mapping) { |
361 | f2fs_put_page(page, 1); | |
362 | goto repeat; | |
eb47b800 JK |
363 | } |
364 | } | |
eb47b800 JK |
365 | |
366 | if (new_i_size && | |
367 | i_size_read(inode) < ((index + 1) << PAGE_CACHE_SHIFT)) { | |
368 | i_size_write(inode, ((index + 1) << PAGE_CACHE_SHIFT)); | |
699489bb JK |
369 | /* Only the directory inode sets new_i_size */ |
370 | set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR); | |
eb47b800 JK |
371 | mark_inode_dirty_sync(inode); |
372 | } | |
373 | return page; | |
374 | } | |
375 | ||
376 | static void read_end_io(struct bio *bio, int err) | |
377 | { | |
378 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
379 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; | |
380 | ||
381 | do { | |
382 | struct page *page = bvec->bv_page; | |
383 | ||
384 | if (--bvec >= bio->bi_io_vec) | |
385 | prefetchw(&bvec->bv_page->flags); | |
386 | ||
387 | if (uptodate) { | |
388 | SetPageUptodate(page); | |
389 | } else { | |
390 | ClearPageUptodate(page); | |
391 | SetPageError(page); | |
392 | } | |
393 | unlock_page(page); | |
394 | } while (bvec >= bio->bi_io_vec); | |
eb47b800 JK |
395 | bio_put(bio); |
396 | } | |
397 | ||
0a8165d7 | 398 | /* |
eb47b800 | 399 | * Fill the locked page with data located in the block address. |
393ff91f | 400 | * Return unlocked page. |
eb47b800 JK |
401 | */ |
402 | int f2fs_readpage(struct f2fs_sb_info *sbi, struct page *page, | |
403 | block_t blk_addr, int type) | |
404 | { | |
405 | struct block_device *bdev = sbi->sb->s_bdev; | |
eb47b800 JK |
406 | struct bio *bio; |
407 | ||
848753aa | 408 | trace_f2fs_readpage(page, blk_addr, type); |
eb47b800 | 409 | |
eb47b800 | 410 | /* Allocate a new bio */ |
3cd8a239 | 411 | bio = f2fs_bio_alloc(bdev, 1); |
eb47b800 JK |
412 | |
413 | /* Initialize the bio */ | |
3cd8a239 | 414 | bio->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr); |
eb47b800 | 415 | bio->bi_end_io = read_end_io; |
3cd8a239 | 416 | |
eb47b800 | 417 | if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) { |
eb47b800 | 418 | bio_put(bio); |
393ff91f | 419 | f2fs_put_page(page, 1); |
eb47b800 JK |
420 | return -EFAULT; |
421 | } | |
422 | ||
423 | submit_bio(type, bio); | |
eb47b800 JK |
424 | return 0; |
425 | } | |
426 | ||
924b720b CY |
427 | void f2fs_submit_read_bio(struct f2fs_sb_info *sbi, int rw) |
428 | { | |
429 | struct f2fs_bio_info *io = &sbi->read_io; | |
430 | ||
431 | if (!io->bio) | |
432 | return; | |
433 | ||
d4d288bc CY |
434 | trace_f2fs_submit_read_bio(sbi->sb, rw, META, io->bio); |
435 | ||
924b720b CY |
436 | mutex_lock(&io->io_mutex); |
437 | if (io->bio) { | |
438 | submit_bio(rw, io->bio); | |
439 | io->bio = NULL; | |
440 | } | |
441 | mutex_unlock(&io->io_mutex); | |
442 | } | |
443 | ||
444 | void submit_read_page(struct f2fs_sb_info *sbi, struct page *page, | |
445 | block_t blk_addr, int rw) | |
446 | { | |
447 | struct block_device *bdev = sbi->sb->s_bdev; | |
448 | struct f2fs_bio_info *io = &sbi->read_io; | |
449 | int bio_blocks; | |
450 | ||
451 | verify_block_addr(sbi, blk_addr); | |
452 | ||
453 | mutex_lock(&io->io_mutex); | |
454 | ||
455 | if (io->bio && io->last_block_in_bio != blk_addr - 1) { | |
456 | submit_bio(rw, io->bio); | |
457 | io->bio = NULL; | |
458 | } | |
459 | alloc_new: | |
460 | if (io->bio == NULL) { | |
461 | bio_blocks = MAX_BIO_BLOCKS(max_hw_blocks(sbi)); | |
462 | io->bio = f2fs_bio_alloc(bdev, bio_blocks); | |
463 | io->bio->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr); | |
464 | io->bio->bi_end_io = read_end_io; | |
465 | } | |
466 | ||
467 | if (bio_add_page(io->bio, page, PAGE_CACHE_SIZE, 0) < | |
468 | PAGE_CACHE_SIZE) { | |
469 | submit_bio(rw, io->bio); | |
470 | io->bio = NULL; | |
471 | goto alloc_new; | |
472 | } | |
473 | ||
474 | io->last_block_in_bio = blk_addr; | |
475 | ||
476 | mutex_unlock(&io->io_mutex); | |
87b8872d | 477 | trace_f2fs_submit_read_page(page, rw, META, blk_addr); |
924b720b CY |
478 | } |
479 | ||
0a8165d7 | 480 | /* |
eb47b800 JK |
481 | * This function should be used by the data read flow only where it |
482 | * does not check the "create" flag that indicates block allocation. | |
483 | * The reason for this special functionality is to exploit VFS readahead | |
484 | * mechanism. | |
485 | */ | |
486 | static int get_data_block_ro(struct inode *inode, sector_t iblock, | |
487 | struct buffer_head *bh_result, int create) | |
488 | { | |
489 | unsigned int blkbits = inode->i_sb->s_blocksize_bits; | |
490 | unsigned maxblocks = bh_result->b_size >> blkbits; | |
491 | struct dnode_of_data dn; | |
492 | pgoff_t pgofs; | |
493 | int err; | |
494 | ||
495 | /* Get the page offset from the block offset(iblock) */ | |
496 | pgofs = (pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits)); | |
497 | ||
848753aa NJ |
498 | if (check_extent_cache(inode, pgofs, bh_result)) { |
499 | trace_f2fs_get_data_block(inode, iblock, bh_result, 0); | |
eb47b800 | 500 | return 0; |
848753aa | 501 | } |
eb47b800 JK |
502 | |
503 | /* When reading holes, we need its node page */ | |
504 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 505 | err = get_dnode_of_data(&dn, pgofs, LOOKUP_NODE_RA); |
848753aa NJ |
506 | if (err) { |
507 | trace_f2fs_get_data_block(inode, iblock, bh_result, err); | |
eb47b800 | 508 | return (err == -ENOENT) ? 0 : err; |
848753aa | 509 | } |
eb47b800 JK |
510 | |
511 | /* It does not support data allocation */ | |
5d56b671 | 512 | f2fs_bug_on(create); |
eb47b800 JK |
513 | |
514 | if (dn.data_blkaddr != NEW_ADDR && dn.data_blkaddr != NULL_ADDR) { | |
515 | int i; | |
516 | unsigned int end_offset; | |
517 | ||
518 | end_offset = IS_INODE(dn.node_page) ? | |
de93653f | 519 | ADDRS_PER_INODE(F2FS_I(inode)) : |
eb47b800 JK |
520 | ADDRS_PER_BLOCK; |
521 | ||
522 | clear_buffer_new(bh_result); | |
523 | ||
524 | /* Give more consecutive addresses for the read ahead */ | |
525 | for (i = 0; i < end_offset - dn.ofs_in_node; i++) | |
526 | if (((datablock_addr(dn.node_page, | |
527 | dn.ofs_in_node + i)) | |
528 | != (dn.data_blkaddr + i)) || maxblocks == i) | |
529 | break; | |
530 | map_bh(bh_result, inode->i_sb, dn.data_blkaddr); | |
f9a4e6df | 531 | bh_result->b_size = (((size_t)i) << blkbits); |
eb47b800 JK |
532 | } |
533 | f2fs_put_dnode(&dn); | |
848753aa | 534 | trace_f2fs_get_data_block(inode, iblock, bh_result, 0); |
eb47b800 JK |
535 | return 0; |
536 | } | |
537 | ||
538 | static int f2fs_read_data_page(struct file *file, struct page *page) | |
539 | { | |
540 | return mpage_readpage(page, get_data_block_ro); | |
541 | } | |
542 | ||
543 | static int f2fs_read_data_pages(struct file *file, | |
544 | struct address_space *mapping, | |
545 | struct list_head *pages, unsigned nr_pages) | |
546 | { | |
547 | return mpage_readpages(mapping, pages, nr_pages, get_data_block_ro); | |
548 | } | |
549 | ||
550 | int do_write_data_page(struct page *page) | |
551 | { | |
552 | struct inode *inode = page->mapping->host; | |
eb47b800 JK |
553 | block_t old_blk_addr, new_blk_addr; |
554 | struct dnode_of_data dn; | |
555 | int err = 0; | |
556 | ||
557 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 558 | err = get_dnode_of_data(&dn, page->index, LOOKUP_NODE); |
eb47b800 JK |
559 | if (err) |
560 | return err; | |
561 | ||
562 | old_blk_addr = dn.data_blkaddr; | |
563 | ||
564 | /* This page is already truncated */ | |
565 | if (old_blk_addr == NULL_ADDR) | |
566 | goto out_writepage; | |
567 | ||
568 | set_page_writeback(page); | |
569 | ||
570 | /* | |
571 | * If current allocation needs SSR, | |
572 | * it had better in-place writes for updated data. | |
573 | */ | |
b25958b6 HL |
574 | if (unlikely(old_blk_addr != NEW_ADDR && |
575 | !is_cold_data(page) && | |
576 | need_inplace_update(inode))) { | |
eb47b800 JK |
577 | rewrite_data_page(F2FS_SB(inode->i_sb), page, |
578 | old_blk_addr); | |
579 | } else { | |
580 | write_data_page(inode, page, &dn, | |
581 | old_blk_addr, &new_blk_addr); | |
582 | update_extent_cache(new_blk_addr, &dn); | |
eb47b800 JK |
583 | } |
584 | out_writepage: | |
585 | f2fs_put_dnode(&dn); | |
586 | return err; | |
587 | } | |
588 | ||
589 | static int f2fs_write_data_page(struct page *page, | |
590 | struct writeback_control *wbc) | |
591 | { | |
592 | struct inode *inode = page->mapping->host; | |
593 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
594 | loff_t i_size = i_size_read(inode); | |
595 | const pgoff_t end_index = ((unsigned long long) i_size) | |
596 | >> PAGE_CACHE_SHIFT; | |
597 | unsigned offset; | |
39936837 | 598 | bool need_balance_fs = false; |
eb47b800 JK |
599 | int err = 0; |
600 | ||
601 | if (page->index < end_index) | |
39936837 | 602 | goto write; |
eb47b800 JK |
603 | |
604 | /* | |
605 | * If the offset is out-of-range of file size, | |
606 | * this page does not have to be written to disk. | |
607 | */ | |
608 | offset = i_size & (PAGE_CACHE_SIZE - 1); | |
609 | if ((page->index >= end_index + 1) || !offset) { | |
610 | if (S_ISDIR(inode->i_mode)) { | |
611 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
612 | inode_dec_dirty_dents(inode); | |
613 | } | |
39936837 | 614 | goto out; |
eb47b800 JK |
615 | } |
616 | ||
617 | zero_user_segment(page, offset, PAGE_CACHE_SIZE); | |
39936837 JK |
618 | write: |
619 | if (sbi->por_doing) { | |
620 | err = AOP_WRITEPAGE_ACTIVATE; | |
eb47b800 | 621 | goto redirty_out; |
39936837 | 622 | } |
eb47b800 | 623 | |
39936837 | 624 | /* Dentry blocks are controlled by checkpoint */ |
eb47b800 JK |
625 | if (S_ISDIR(inode->i_mode)) { |
626 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
627 | inode_dec_dirty_dents(inode); | |
39936837 JK |
628 | err = do_write_data_page(page); |
629 | } else { | |
e479556b | 630 | f2fs_lock_op(sbi); |
39936837 | 631 | err = do_write_data_page(page); |
e479556b | 632 | f2fs_unlock_op(sbi); |
39936837 | 633 | need_balance_fs = true; |
eb47b800 | 634 | } |
39936837 JK |
635 | if (err == -ENOENT) |
636 | goto out; | |
637 | else if (err) | |
638 | goto redirty_out; | |
eb47b800 JK |
639 | |
640 | if (wbc->for_reclaim) | |
641 | f2fs_submit_bio(sbi, DATA, true); | |
642 | ||
eb47b800 | 643 | clear_cold_data(page); |
39936837 | 644 | out: |
eb47b800 | 645 | unlock_page(page); |
39936837 | 646 | if (need_balance_fs) |
eb47b800 JK |
647 | f2fs_balance_fs(sbi); |
648 | return 0; | |
649 | ||
eb47b800 JK |
650 | redirty_out: |
651 | wbc->pages_skipped++; | |
652 | set_page_dirty(page); | |
39936837 | 653 | return err; |
eb47b800 JK |
654 | } |
655 | ||
656 | #define MAX_DESIRED_PAGES_WP 4096 | |
657 | ||
fa9150a8 NJ |
658 | static int __f2fs_writepage(struct page *page, struct writeback_control *wbc, |
659 | void *data) | |
660 | { | |
661 | struct address_space *mapping = data; | |
662 | int ret = mapping->a_ops->writepage(page, wbc); | |
663 | mapping_set_error(mapping, ret); | |
664 | return ret; | |
665 | } | |
666 | ||
25ca923b | 667 | static int f2fs_write_data_pages(struct address_space *mapping, |
eb47b800 JK |
668 | struct writeback_control *wbc) |
669 | { | |
670 | struct inode *inode = mapping->host; | |
671 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
531ad7d5 | 672 | bool locked = false; |
eb47b800 JK |
673 | int ret; |
674 | long excess_nrtw = 0, desired_nrtw; | |
675 | ||
cfb185a1 | 676 | /* deal with chardevs and other special file */ |
677 | if (!mapping->a_ops->writepage) | |
678 | return 0; | |
679 | ||
eb47b800 JK |
680 | if (wbc->nr_to_write < MAX_DESIRED_PAGES_WP) { |
681 | desired_nrtw = MAX_DESIRED_PAGES_WP; | |
682 | excess_nrtw = desired_nrtw - wbc->nr_to_write; | |
683 | wbc->nr_to_write = desired_nrtw; | |
684 | } | |
685 | ||
531ad7d5 | 686 | if (!S_ISDIR(inode->i_mode)) { |
eb47b800 | 687 | mutex_lock(&sbi->writepages); |
531ad7d5 JK |
688 | locked = true; |
689 | } | |
fa9150a8 | 690 | ret = write_cache_pages(mapping, wbc, __f2fs_writepage, mapping); |
531ad7d5 | 691 | if (locked) |
eb47b800 JK |
692 | mutex_unlock(&sbi->writepages); |
693 | f2fs_submit_bio(sbi, DATA, (wbc->sync_mode == WB_SYNC_ALL)); | |
694 | ||
695 | remove_dirty_dir_inode(inode); | |
696 | ||
697 | wbc->nr_to_write -= excess_nrtw; | |
698 | return ret; | |
699 | } | |
700 | ||
701 | static int f2fs_write_begin(struct file *file, struct address_space *mapping, | |
702 | loff_t pos, unsigned len, unsigned flags, | |
703 | struct page **pagep, void **fsdata) | |
704 | { | |
705 | struct inode *inode = mapping->host; | |
706 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
707 | struct page *page; | |
708 | pgoff_t index = ((unsigned long long) pos) >> PAGE_CACHE_SHIFT; | |
709 | struct dnode_of_data dn; | |
710 | int err = 0; | |
711 | ||
eb47b800 | 712 | f2fs_balance_fs(sbi); |
afcb7ca0 | 713 | repeat: |
eb47b800 JK |
714 | page = grab_cache_page_write_begin(mapping, index, flags); |
715 | if (!page) | |
716 | return -ENOMEM; | |
717 | *pagep = page; | |
718 | ||
e479556b | 719 | f2fs_lock_op(sbi); |
eb47b800 | 720 | set_new_dnode(&dn, inode, NULL, NULL, 0); |
b600965c | 721 | err = f2fs_reserve_block(&dn, index); |
e479556b | 722 | f2fs_unlock_op(sbi); |
eb47b800 | 723 | |
b600965c HL |
724 | if (err) { |
725 | f2fs_put_page(page, 1); | |
726 | return err; | |
727 | } | |
728 | ||
eb47b800 JK |
729 | if ((len == PAGE_CACHE_SIZE) || PageUptodate(page)) |
730 | return 0; | |
731 | ||
732 | if ((pos & PAGE_CACHE_MASK) >= i_size_read(inode)) { | |
733 | unsigned start = pos & (PAGE_CACHE_SIZE - 1); | |
734 | unsigned end = start + len; | |
735 | ||
736 | /* Reading beyond i_size is simple: memset to zero */ | |
737 | zero_user_segments(page, 0, start, end, PAGE_CACHE_SIZE); | |
393ff91f | 738 | goto out; |
eb47b800 JK |
739 | } |
740 | ||
741 | if (dn.data_blkaddr == NEW_ADDR) { | |
742 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
743 | } else { | |
744 | err = f2fs_readpage(sbi, page, dn.data_blkaddr, READ_SYNC); | |
393ff91f | 745 | if (err) |
eb47b800 | 746 | return err; |
393ff91f JK |
747 | lock_page(page); |
748 | if (!PageUptodate(page)) { | |
749 | f2fs_put_page(page, 1); | |
750 | return -EIO; | |
eb47b800 | 751 | } |
afcb7ca0 JK |
752 | if (page->mapping != mapping) { |
753 | f2fs_put_page(page, 1); | |
754 | goto repeat; | |
eb47b800 JK |
755 | } |
756 | } | |
393ff91f | 757 | out: |
eb47b800 JK |
758 | SetPageUptodate(page); |
759 | clear_cold_data(page); | |
760 | return 0; | |
761 | } | |
762 | ||
a1dd3c13 JK |
763 | static int f2fs_write_end(struct file *file, |
764 | struct address_space *mapping, | |
765 | loff_t pos, unsigned len, unsigned copied, | |
766 | struct page *page, void *fsdata) | |
767 | { | |
768 | struct inode *inode = page->mapping->host; | |
769 | ||
770 | SetPageUptodate(page); | |
771 | set_page_dirty(page); | |
772 | ||
773 | if (pos + copied > i_size_read(inode)) { | |
774 | i_size_write(inode, pos + copied); | |
775 | mark_inode_dirty(inode); | |
776 | update_inode_page(inode); | |
777 | } | |
778 | ||
75c3c8bc | 779 | f2fs_put_page(page, 1); |
a1dd3c13 JK |
780 | return copied; |
781 | } | |
782 | ||
eb47b800 JK |
783 | static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb, |
784 | const struct iovec *iov, loff_t offset, unsigned long nr_segs) | |
785 | { | |
786 | struct file *file = iocb->ki_filp; | |
787 | struct inode *inode = file->f_mapping->host; | |
788 | ||
789 | if (rw == WRITE) | |
790 | return 0; | |
791 | ||
792 | /* Needs synchronization with the cleaner */ | |
793 | return blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs, | |
794 | get_data_block_ro); | |
795 | } | |
796 | ||
d47992f8 LC |
797 | static void f2fs_invalidate_data_page(struct page *page, unsigned int offset, |
798 | unsigned int length) | |
eb47b800 JK |
799 | { |
800 | struct inode *inode = page->mapping->host; | |
801 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
802 | if (S_ISDIR(inode->i_mode) && PageDirty(page)) { | |
803 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
804 | inode_dec_dirty_dents(inode); | |
805 | } | |
806 | ClearPagePrivate(page); | |
807 | } | |
808 | ||
809 | static int f2fs_release_data_page(struct page *page, gfp_t wait) | |
810 | { | |
811 | ClearPagePrivate(page); | |
c3850aa1 | 812 | return 1; |
eb47b800 JK |
813 | } |
814 | ||
815 | static int f2fs_set_data_page_dirty(struct page *page) | |
816 | { | |
817 | struct address_space *mapping = page->mapping; | |
818 | struct inode *inode = mapping->host; | |
819 | ||
26c6b887 JK |
820 | trace_f2fs_set_page_dirty(page, DATA); |
821 | ||
eb47b800 JK |
822 | SetPageUptodate(page); |
823 | if (!PageDirty(page)) { | |
824 | __set_page_dirty_nobuffers(page); | |
825 | set_dirty_dir_page(inode, page); | |
826 | return 1; | |
827 | } | |
828 | return 0; | |
829 | } | |
830 | ||
c01e54b7 JK |
831 | static sector_t f2fs_bmap(struct address_space *mapping, sector_t block) |
832 | { | |
833 | return generic_block_bmap(mapping, block, get_data_block_ro); | |
834 | } | |
835 | ||
eb47b800 JK |
836 | const struct address_space_operations f2fs_dblock_aops = { |
837 | .readpage = f2fs_read_data_page, | |
838 | .readpages = f2fs_read_data_pages, | |
839 | .writepage = f2fs_write_data_page, | |
840 | .writepages = f2fs_write_data_pages, | |
841 | .write_begin = f2fs_write_begin, | |
a1dd3c13 | 842 | .write_end = f2fs_write_end, |
eb47b800 JK |
843 | .set_page_dirty = f2fs_set_data_page_dirty, |
844 | .invalidatepage = f2fs_invalidate_data_page, | |
845 | .releasepage = f2fs_release_data_page, | |
846 | .direct_IO = f2fs_direct_IO, | |
c01e54b7 | 847 | .bmap = f2fs_bmap, |
eb47b800 | 848 | }; |