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" | |
db9f7c1a | 25 | #include "trace.h" |
848753aa | 26 | #include <trace/events/f2fs.h> |
eb47b800 | 27 | |
93dfe2ac JK |
28 | static void f2fs_read_end_io(struct bio *bio, int err) |
29 | { | |
f568849e LT |
30 | struct bio_vec *bvec; |
31 | int i; | |
93dfe2ac | 32 | |
f568849e | 33 | bio_for_each_segment_all(bvec, bio, i) { |
93dfe2ac JK |
34 | struct page *page = bvec->bv_page; |
35 | ||
f568849e LT |
36 | if (!err) { |
37 | SetPageUptodate(page); | |
38 | } else { | |
93dfe2ac JK |
39 | ClearPageUptodate(page); |
40 | SetPageError(page); | |
41 | } | |
42 | unlock_page(page); | |
f568849e | 43 | } |
93dfe2ac JK |
44 | bio_put(bio); |
45 | } | |
46 | ||
47 | static void f2fs_write_end_io(struct bio *bio, int err) | |
48 | { | |
1b1f559f | 49 | struct f2fs_sb_info *sbi = bio->bi_private; |
f568849e LT |
50 | struct bio_vec *bvec; |
51 | int i; | |
93dfe2ac | 52 | |
f568849e | 53 | bio_for_each_segment_all(bvec, bio, i) { |
93dfe2ac JK |
54 | struct page *page = bvec->bv_page; |
55 | ||
f568849e | 56 | if (unlikely(err)) { |
cf779cab | 57 | set_page_dirty(page); |
93dfe2ac | 58 | set_bit(AS_EIO, &page->mapping->flags); |
744602cf | 59 | f2fs_stop_checkpoint(sbi); |
93dfe2ac JK |
60 | } |
61 | end_page_writeback(page); | |
62 | dec_page_count(sbi, F2FS_WRITEBACK); | |
f568849e | 63 | } |
93dfe2ac | 64 | |
93dfe2ac JK |
65 | if (!get_pages(sbi, F2FS_WRITEBACK) && |
66 | !list_empty(&sbi->cp_wait.task_list)) | |
67 | wake_up(&sbi->cp_wait); | |
68 | ||
69 | bio_put(bio); | |
70 | } | |
71 | ||
940a6d34 GZ |
72 | /* |
73 | * Low-level block read/write IO operations. | |
74 | */ | |
75 | static struct bio *__bio_alloc(struct f2fs_sb_info *sbi, block_t blk_addr, | |
76 | int npages, bool is_read) | |
77 | { | |
78 | struct bio *bio; | |
79 | ||
80 | /* No failure on bio allocation */ | |
81 | bio = bio_alloc(GFP_NOIO, npages); | |
82 | ||
83 | bio->bi_bdev = sbi->sb->s_bdev; | |
55cf9cb6 | 84 | bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(blk_addr); |
940a6d34 | 85 | bio->bi_end_io = is_read ? f2fs_read_end_io : f2fs_write_end_io; |
1b1f559f | 86 | bio->bi_private = sbi; |
940a6d34 GZ |
87 | |
88 | return bio; | |
89 | } | |
90 | ||
458e6197 | 91 | static void __submit_merged_bio(struct f2fs_bio_info *io) |
93dfe2ac | 92 | { |
458e6197 | 93 | struct f2fs_io_info *fio = &io->fio; |
93dfe2ac JK |
94 | |
95 | if (!io->bio) | |
96 | return; | |
97 | ||
6a8f8ca5 | 98 | if (is_read_io(fio->rw)) |
2ace38e0 | 99 | trace_f2fs_submit_read_bio(io->sbi->sb, fio, io->bio); |
6a8f8ca5 | 100 | else |
2ace38e0 | 101 | trace_f2fs_submit_write_bio(io->sbi->sb, fio, io->bio); |
940a6d34 | 102 | |
6a8f8ca5 | 103 | submit_bio(fio->rw, io->bio); |
93dfe2ac JK |
104 | io->bio = NULL; |
105 | } | |
106 | ||
107 | void f2fs_submit_merged_bio(struct f2fs_sb_info *sbi, | |
458e6197 | 108 | enum page_type type, int rw) |
93dfe2ac JK |
109 | { |
110 | enum page_type btype = PAGE_TYPE_OF_BIO(type); | |
111 | struct f2fs_bio_info *io; | |
112 | ||
113 | io = is_read_io(rw) ? &sbi->read_io : &sbi->write_io[btype]; | |
114 | ||
df0f8dc0 | 115 | down_write(&io->io_rwsem); |
458e6197 JK |
116 | |
117 | /* change META to META_FLUSH in the checkpoint procedure */ | |
118 | if (type >= META_FLUSH) { | |
119 | io->fio.type = META_FLUSH; | |
0f7b2abd JK |
120 | if (test_opt(sbi, NOBARRIER)) |
121 | io->fio.rw = WRITE_FLUSH | REQ_META | REQ_PRIO; | |
122 | else | |
123 | io->fio.rw = WRITE_FLUSH_FUA | REQ_META | REQ_PRIO; | |
458e6197 JK |
124 | } |
125 | __submit_merged_bio(io); | |
df0f8dc0 | 126 | up_write(&io->io_rwsem); |
93dfe2ac JK |
127 | } |
128 | ||
129 | /* | |
130 | * Fill the locked page with data located in the block address. | |
131 | * Return unlocked page. | |
132 | */ | |
133 | int f2fs_submit_page_bio(struct f2fs_sb_info *sbi, struct page *page, | |
cf04e8eb | 134 | struct f2fs_io_info *fio) |
93dfe2ac | 135 | { |
93dfe2ac JK |
136 | struct bio *bio; |
137 | ||
2ace38e0 | 138 | trace_f2fs_submit_page_bio(page, fio); |
db9f7c1a | 139 | f2fs_trace_ios(page, fio, 0); |
93dfe2ac JK |
140 | |
141 | /* Allocate a new bio */ | |
cf04e8eb | 142 | bio = __bio_alloc(sbi, fio->blk_addr, 1, is_read_io(fio->rw)); |
93dfe2ac JK |
143 | |
144 | if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) { | |
145 | bio_put(bio); | |
146 | f2fs_put_page(page, 1); | |
147 | return -EFAULT; | |
148 | } | |
149 | ||
cf04e8eb | 150 | submit_bio(fio->rw, bio); |
93dfe2ac JK |
151 | return 0; |
152 | } | |
153 | ||
154 | void f2fs_submit_page_mbio(struct f2fs_sb_info *sbi, struct page *page, | |
cf04e8eb | 155 | struct f2fs_io_info *fio) |
93dfe2ac | 156 | { |
458e6197 | 157 | enum page_type btype = PAGE_TYPE_OF_BIO(fio->type); |
93dfe2ac | 158 | struct f2fs_bio_info *io; |
940a6d34 | 159 | bool is_read = is_read_io(fio->rw); |
93dfe2ac | 160 | |
940a6d34 | 161 | io = is_read ? &sbi->read_io : &sbi->write_io[btype]; |
93dfe2ac | 162 | |
cf04e8eb | 163 | verify_block_addr(sbi, fio->blk_addr); |
93dfe2ac | 164 | |
df0f8dc0 | 165 | down_write(&io->io_rwsem); |
93dfe2ac | 166 | |
940a6d34 | 167 | if (!is_read) |
93dfe2ac JK |
168 | inc_page_count(sbi, F2FS_WRITEBACK); |
169 | ||
cf04e8eb | 170 | if (io->bio && (io->last_block_in_bio != fio->blk_addr - 1 || |
458e6197 JK |
171 | io->fio.rw != fio->rw)) |
172 | __submit_merged_bio(io); | |
93dfe2ac JK |
173 | alloc_new: |
174 | if (io->bio == NULL) { | |
90a893c7 | 175 | int bio_blocks = MAX_BIO_BLOCKS(sbi); |
940a6d34 | 176 | |
cf04e8eb | 177 | io->bio = __bio_alloc(sbi, fio->blk_addr, bio_blocks, is_read); |
458e6197 | 178 | io->fio = *fio; |
93dfe2ac JK |
179 | } |
180 | ||
181 | if (bio_add_page(io->bio, page, PAGE_CACHE_SIZE, 0) < | |
182 | PAGE_CACHE_SIZE) { | |
458e6197 | 183 | __submit_merged_bio(io); |
93dfe2ac JK |
184 | goto alloc_new; |
185 | } | |
186 | ||
cf04e8eb | 187 | io->last_block_in_bio = fio->blk_addr; |
db9f7c1a | 188 | f2fs_trace_ios(page, fio, 0); |
93dfe2ac | 189 | |
df0f8dc0 | 190 | up_write(&io->io_rwsem); |
2ace38e0 | 191 | trace_f2fs_submit_page_mbio(page, fio); |
93dfe2ac JK |
192 | } |
193 | ||
0a8165d7 | 194 | /* |
eb47b800 JK |
195 | * Lock ordering for the change of data block address: |
196 | * ->data_page | |
197 | * ->node_page | |
198 | * update block addresses in the node page | |
199 | */ | |
e1509cf2 | 200 | static void __set_data_blkaddr(struct dnode_of_data *dn) |
eb47b800 JK |
201 | { |
202 | struct f2fs_node *rn; | |
203 | __le32 *addr_array; | |
204 | struct page *node_page = dn->node_page; | |
205 | unsigned int ofs_in_node = dn->ofs_in_node; | |
206 | ||
5514f0aa | 207 | f2fs_wait_on_page_writeback(node_page, NODE); |
eb47b800 | 208 | |
45590710 | 209 | rn = F2FS_NODE(node_page); |
eb47b800 JK |
210 | |
211 | /* Get physical address of data block */ | |
212 | addr_array = blkaddr_in_node(rn); | |
e1509cf2 | 213 | addr_array[ofs_in_node] = cpu_to_le32(dn->data_blkaddr); |
eb47b800 JK |
214 | set_page_dirty(node_page); |
215 | } | |
216 | ||
217 | int reserve_new_block(struct dnode_of_data *dn) | |
218 | { | |
4081363f | 219 | struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode); |
eb47b800 | 220 | |
6bacf52f | 221 | if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC))) |
eb47b800 | 222 | return -EPERM; |
cfb271d4 | 223 | if (unlikely(!inc_valid_block_count(sbi, dn->inode, 1))) |
eb47b800 JK |
224 | return -ENOSPC; |
225 | ||
c01e2853 NJ |
226 | trace_f2fs_reserve_new_block(dn->inode, dn->nid, dn->ofs_in_node); |
227 | ||
eb47b800 | 228 | dn->data_blkaddr = NEW_ADDR; |
e1509cf2 | 229 | __set_data_blkaddr(dn); |
a18ff063 | 230 | mark_inode_dirty(dn->inode); |
eb47b800 JK |
231 | sync_inode_page(dn); |
232 | return 0; | |
233 | } | |
234 | ||
b600965c HL |
235 | int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index) |
236 | { | |
237 | bool need_put = dn->inode_page ? false : true; | |
238 | int err; | |
239 | ||
240 | err = get_dnode_of_data(dn, index, ALLOC_NODE); | |
241 | if (err) | |
242 | return err; | |
a8865372 | 243 | |
b600965c HL |
244 | if (dn->data_blkaddr == NULL_ADDR) |
245 | err = reserve_new_block(dn); | |
a8865372 | 246 | if (err || need_put) |
b600965c HL |
247 | f2fs_put_dnode(dn); |
248 | return err; | |
249 | } | |
250 | ||
a2e7d1bf CY |
251 | static void f2fs_map_bh(struct super_block *sb, pgoff_t pgofs, |
252 | struct extent_info *ei, struct buffer_head *bh_result) | |
253 | { | |
254 | unsigned int blkbits = sb->s_blocksize_bits; | |
255 | size_t count; | |
256 | ||
257 | set_buffer_new(bh_result); | |
258 | map_bh(bh_result, sb, ei->blk + pgofs - ei->fofs); | |
259 | count = ei->fofs + ei->len - pgofs; | |
260 | if (count < (UINT_MAX >> blkbits)) | |
261 | bh_result->b_size = (count << blkbits); | |
262 | else | |
263 | bh_result->b_size = UINT_MAX; | |
264 | } | |
265 | ||
eb47b800 | 266 | static int check_extent_cache(struct inode *inode, pgoff_t pgofs, |
a2e7d1bf | 267 | struct extent_info *ei) |
eb47b800 JK |
268 | { |
269 | struct f2fs_inode_info *fi = F2FS_I(inode); | |
eb47b800 JK |
270 | pgoff_t start_fofs, end_fofs; |
271 | block_t start_blkaddr; | |
272 | ||
c11abd1a JK |
273 | if (is_inode_flag_set(fi, FI_NO_EXTENT)) |
274 | return 0; | |
275 | ||
0c872e2d | 276 | read_lock(&fi->ext_lock); |
eb47b800 | 277 | if (fi->ext.len == 0) { |
0c872e2d | 278 | read_unlock(&fi->ext_lock); |
eb47b800 JK |
279 | return 0; |
280 | } | |
281 | ||
dcdfff65 JK |
282 | stat_inc_total_hit(inode->i_sb); |
283 | ||
eb47b800 JK |
284 | start_fofs = fi->ext.fofs; |
285 | end_fofs = fi->ext.fofs + fi->ext.len - 1; | |
4d0b0bd4 | 286 | start_blkaddr = fi->ext.blk; |
eb47b800 JK |
287 | |
288 | if (pgofs >= start_fofs && pgofs <= end_fofs) { | |
a2e7d1bf | 289 | *ei = fi->ext; |
dcdfff65 | 290 | stat_inc_read_hit(inode->i_sb); |
0c872e2d | 291 | read_unlock(&fi->ext_lock); |
eb47b800 JK |
292 | return 1; |
293 | } | |
0c872e2d | 294 | read_unlock(&fi->ext_lock); |
eb47b800 JK |
295 | return 0; |
296 | } | |
297 | ||
e1509cf2 | 298 | void update_extent_cache(struct dnode_of_data *dn) |
eb47b800 JK |
299 | { |
300 | struct f2fs_inode_info *fi = F2FS_I(dn->inode); | |
301 | pgoff_t fofs, start_fofs, end_fofs; | |
302 | block_t start_blkaddr, end_blkaddr; | |
c11abd1a | 303 | int need_update = true; |
eb47b800 | 304 | |
e1509cf2 | 305 | f2fs_bug_on(F2FS_I_SB(dn->inode), dn->data_blkaddr == NEW_ADDR); |
eb47b800 JK |
306 | |
307 | /* Update the page address in the parent node */ | |
e1509cf2 | 308 | __set_data_blkaddr(dn); |
eb47b800 | 309 | |
c11abd1a JK |
310 | if (is_inode_flag_set(fi, FI_NO_EXTENT)) |
311 | return; | |
312 | ||
3547ea96 JK |
313 | fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) + |
314 | dn->ofs_in_node; | |
315 | ||
0c872e2d | 316 | write_lock(&fi->ext_lock); |
eb47b800 JK |
317 | |
318 | start_fofs = fi->ext.fofs; | |
319 | end_fofs = fi->ext.fofs + fi->ext.len - 1; | |
4d0b0bd4 CY |
320 | start_blkaddr = fi->ext.blk; |
321 | end_blkaddr = fi->ext.blk + fi->ext.len - 1; | |
eb47b800 JK |
322 | |
323 | /* Drop and initialize the matched extent */ | |
324 | if (fi->ext.len == 1 && fofs == start_fofs) | |
325 | fi->ext.len = 0; | |
326 | ||
327 | /* Initial extent */ | |
328 | if (fi->ext.len == 0) { | |
e1509cf2 | 329 | if (dn->data_blkaddr != NULL_ADDR) { |
eb47b800 | 330 | fi->ext.fofs = fofs; |
4d0b0bd4 | 331 | fi->ext.blk = dn->data_blkaddr; |
eb47b800 JK |
332 | fi->ext.len = 1; |
333 | } | |
334 | goto end_update; | |
335 | } | |
336 | ||
6224da87 | 337 | /* Front merge */ |
e1509cf2 | 338 | if (fofs == start_fofs - 1 && dn->data_blkaddr == start_blkaddr - 1) { |
eb47b800 | 339 | fi->ext.fofs--; |
4d0b0bd4 | 340 | fi->ext.blk--; |
eb47b800 JK |
341 | fi->ext.len++; |
342 | goto end_update; | |
343 | } | |
344 | ||
345 | /* Back merge */ | |
e1509cf2 | 346 | if (fofs == end_fofs + 1 && dn->data_blkaddr == end_blkaddr + 1) { |
eb47b800 JK |
347 | fi->ext.len++; |
348 | goto end_update; | |
349 | } | |
350 | ||
351 | /* Split the existing extent */ | |
352 | if (fi->ext.len > 1 && | |
353 | fofs >= start_fofs && fofs <= end_fofs) { | |
354 | if ((end_fofs - fofs) < (fi->ext.len >> 1)) { | |
355 | fi->ext.len = fofs - start_fofs; | |
356 | } else { | |
357 | fi->ext.fofs = fofs + 1; | |
4d0b0bd4 | 358 | fi->ext.blk = start_blkaddr + fofs - start_fofs + 1; |
eb47b800 JK |
359 | fi->ext.len -= fofs - start_fofs + 1; |
360 | } | |
c11abd1a JK |
361 | } else { |
362 | need_update = false; | |
eb47b800 | 363 | } |
eb47b800 | 364 | |
c11abd1a JK |
365 | /* Finally, if the extent is very fragmented, let's drop the cache. */ |
366 | if (fi->ext.len < F2FS_MIN_EXTENT_LEN) { | |
367 | fi->ext.len = 0; | |
368 | set_inode_flag(fi, FI_NO_EXTENT); | |
369 | need_update = true; | |
370 | } | |
eb47b800 | 371 | end_update: |
0c872e2d | 372 | write_unlock(&fi->ext_lock); |
c11abd1a JK |
373 | if (need_update) |
374 | sync_inode_page(dn); | |
375 | return; | |
eb47b800 JK |
376 | } |
377 | ||
c718379b | 378 | struct page *find_data_page(struct inode *inode, pgoff_t index, bool sync) |
eb47b800 | 379 | { |
eb47b800 JK |
380 | struct address_space *mapping = inode->i_mapping; |
381 | struct dnode_of_data dn; | |
382 | struct page *page; | |
383 | int err; | |
cf04e8eb JK |
384 | struct f2fs_io_info fio = { |
385 | .type = DATA, | |
386 | .rw = sync ? READ_SYNC : READA, | |
387 | }; | |
eb47b800 JK |
388 | |
389 | page = find_get_page(mapping, index); | |
390 | if (page && PageUptodate(page)) | |
391 | return page; | |
392 | f2fs_put_page(page, 0); | |
393 | ||
394 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 395 | err = get_dnode_of_data(&dn, index, LOOKUP_NODE); |
eb47b800 JK |
396 | if (err) |
397 | return ERR_PTR(err); | |
398 | f2fs_put_dnode(&dn); | |
399 | ||
400 | if (dn.data_blkaddr == NULL_ADDR) | |
401 | return ERR_PTR(-ENOENT); | |
402 | ||
403 | /* By fallocate(), there is no cached page, but with NEW_ADDR */ | |
6bacf52f | 404 | if (unlikely(dn.data_blkaddr == NEW_ADDR)) |
eb47b800 JK |
405 | return ERR_PTR(-EINVAL); |
406 | ||
9ac1349a | 407 | page = grab_cache_page(mapping, index); |
eb47b800 JK |
408 | if (!page) |
409 | return ERR_PTR(-ENOMEM); | |
410 | ||
393ff91f JK |
411 | if (PageUptodate(page)) { |
412 | unlock_page(page); | |
413 | return page; | |
414 | } | |
415 | ||
cf04e8eb JK |
416 | fio.blk_addr = dn.data_blkaddr; |
417 | err = f2fs_submit_page_bio(F2FS_I_SB(inode), page, &fio); | |
1069bbf7 CY |
418 | if (err) |
419 | return ERR_PTR(err); | |
420 | ||
c718379b JK |
421 | if (sync) { |
422 | wait_on_page_locked(page); | |
6bacf52f | 423 | if (unlikely(!PageUptodate(page))) { |
c718379b JK |
424 | f2fs_put_page(page, 0); |
425 | return ERR_PTR(-EIO); | |
426 | } | |
eb47b800 | 427 | } |
eb47b800 JK |
428 | return page; |
429 | } | |
430 | ||
0a8165d7 | 431 | /* |
eb47b800 JK |
432 | * If it tries to access a hole, return an error. |
433 | * Because, the callers, functions in dir.c and GC, should be able to know | |
434 | * whether this page exists or not. | |
435 | */ | |
436 | struct page *get_lock_data_page(struct inode *inode, pgoff_t index) | |
437 | { | |
eb47b800 JK |
438 | struct address_space *mapping = inode->i_mapping; |
439 | struct dnode_of_data dn; | |
440 | struct page *page; | |
441 | int err; | |
cf04e8eb JK |
442 | struct f2fs_io_info fio = { |
443 | .type = DATA, | |
444 | .rw = READ_SYNC, | |
445 | }; | |
650495de | 446 | repeat: |
9ac1349a | 447 | page = grab_cache_page(mapping, index); |
650495de JK |
448 | if (!page) |
449 | return ERR_PTR(-ENOMEM); | |
450 | ||
eb47b800 | 451 | set_new_dnode(&dn, inode, NULL, NULL, 0); |
266e97a8 | 452 | err = get_dnode_of_data(&dn, index, LOOKUP_NODE); |
650495de JK |
453 | if (err) { |
454 | f2fs_put_page(page, 1); | |
eb47b800 | 455 | return ERR_PTR(err); |
650495de | 456 | } |
eb47b800 JK |
457 | f2fs_put_dnode(&dn); |
458 | ||
6bacf52f | 459 | if (unlikely(dn.data_blkaddr == NULL_ADDR)) { |
650495de | 460 | f2fs_put_page(page, 1); |
eb47b800 | 461 | return ERR_PTR(-ENOENT); |
650495de | 462 | } |
eb47b800 JK |
463 | |
464 | if (PageUptodate(page)) | |
465 | return page; | |
466 | ||
d59ff4df JK |
467 | /* |
468 | * A new dentry page is allocated but not able to be written, since its | |
469 | * new inode page couldn't be allocated due to -ENOSPC. | |
470 | * In such the case, its blkaddr can be remained as NEW_ADDR. | |
471 | * see, f2fs_add_link -> get_new_data_page -> init_inode_metadata. | |
472 | */ | |
473 | if (dn.data_blkaddr == NEW_ADDR) { | |
474 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
475 | SetPageUptodate(page); | |
476 | return page; | |
477 | } | |
eb47b800 | 478 | |
cf04e8eb JK |
479 | fio.blk_addr = dn.data_blkaddr; |
480 | err = f2fs_submit_page_bio(F2FS_I_SB(inode), page, &fio); | |
393ff91f | 481 | if (err) |
eb47b800 | 482 | return ERR_PTR(err); |
393ff91f JK |
483 | |
484 | lock_page(page); | |
6bacf52f | 485 | if (unlikely(!PageUptodate(page))) { |
393ff91f JK |
486 | f2fs_put_page(page, 1); |
487 | return ERR_PTR(-EIO); | |
eb47b800 | 488 | } |
6bacf52f | 489 | if (unlikely(page->mapping != mapping)) { |
afcb7ca0 JK |
490 | f2fs_put_page(page, 1); |
491 | goto repeat; | |
eb47b800 JK |
492 | } |
493 | return page; | |
494 | } | |
495 | ||
0a8165d7 | 496 | /* |
eb47b800 JK |
497 | * Caller ensures that this data page is never allocated. |
498 | * A new zero-filled data page is allocated in the page cache. | |
39936837 | 499 | * |
4f4124d0 CY |
500 | * Also, caller should grab and release a rwsem by calling f2fs_lock_op() and |
501 | * f2fs_unlock_op(). | |
a8865372 | 502 | * Note that, ipage is set only by make_empty_dir. |
eb47b800 | 503 | */ |
64aa7ed9 | 504 | struct page *get_new_data_page(struct inode *inode, |
a8865372 | 505 | struct page *ipage, pgoff_t index, bool new_i_size) |
eb47b800 | 506 | { |
eb47b800 JK |
507 | struct address_space *mapping = inode->i_mapping; |
508 | struct page *page; | |
509 | struct dnode_of_data dn; | |
510 | int err; | |
511 | ||
a8865372 | 512 | set_new_dnode(&dn, inode, ipage, NULL, 0); |
b600965c | 513 | err = f2fs_reserve_block(&dn, index); |
eb47b800 JK |
514 | if (err) |
515 | return ERR_PTR(err); | |
afcb7ca0 | 516 | repeat: |
eb47b800 | 517 | page = grab_cache_page(mapping, index); |
a8865372 JK |
518 | if (!page) { |
519 | err = -ENOMEM; | |
520 | goto put_err; | |
521 | } | |
eb47b800 JK |
522 | |
523 | if (PageUptodate(page)) | |
524 | return page; | |
525 | ||
526 | if (dn.data_blkaddr == NEW_ADDR) { | |
527 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
393ff91f | 528 | SetPageUptodate(page); |
eb47b800 | 529 | } else { |
cf04e8eb JK |
530 | struct f2fs_io_info fio = { |
531 | .type = DATA, | |
532 | .rw = READ_SYNC, | |
533 | .blk_addr = dn.data_blkaddr, | |
534 | }; | |
535 | err = f2fs_submit_page_bio(F2FS_I_SB(inode), page, &fio); | |
393ff91f | 536 | if (err) |
a8865372 JK |
537 | goto put_err; |
538 | ||
393ff91f | 539 | lock_page(page); |
6bacf52f | 540 | if (unlikely(!PageUptodate(page))) { |
393ff91f | 541 | f2fs_put_page(page, 1); |
a8865372 JK |
542 | err = -EIO; |
543 | goto put_err; | |
eb47b800 | 544 | } |
6bacf52f | 545 | if (unlikely(page->mapping != mapping)) { |
afcb7ca0 JK |
546 | f2fs_put_page(page, 1); |
547 | goto repeat; | |
eb47b800 JK |
548 | } |
549 | } | |
eb47b800 JK |
550 | |
551 | if (new_i_size && | |
552 | i_size_read(inode) < ((index + 1) << PAGE_CACHE_SHIFT)) { | |
553 | i_size_write(inode, ((index + 1) << PAGE_CACHE_SHIFT)); | |
699489bb JK |
554 | /* Only the directory inode sets new_i_size */ |
555 | set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR); | |
eb47b800 JK |
556 | } |
557 | return page; | |
a8865372 JK |
558 | |
559 | put_err: | |
560 | f2fs_put_dnode(&dn); | |
561 | return ERR_PTR(err); | |
eb47b800 JK |
562 | } |
563 | ||
bfad7c2d JK |
564 | static int __allocate_data_block(struct dnode_of_data *dn) |
565 | { | |
4081363f | 566 | struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode); |
976e4c50 | 567 | struct f2fs_inode_info *fi = F2FS_I(dn->inode); |
bfad7c2d | 568 | struct f2fs_summary sum; |
bfad7c2d | 569 | struct node_info ni; |
38aa0889 | 570 | int seg = CURSEG_WARM_DATA; |
976e4c50 | 571 | pgoff_t fofs; |
bfad7c2d JK |
572 | |
573 | if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC))) | |
574 | return -EPERM; | |
575 | if (unlikely(!inc_valid_block_count(sbi, dn->inode, 1))) | |
576 | return -ENOSPC; | |
577 | ||
bfad7c2d JK |
578 | get_node_info(sbi, dn->nid, &ni); |
579 | set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version); | |
580 | ||
38aa0889 JK |
581 | if (dn->ofs_in_node == 0 && dn->inode_page == dn->node_page) |
582 | seg = CURSEG_DIRECT_IO; | |
583 | ||
584 | allocate_data_block(sbi, NULL, NULL_ADDR, &dn->data_blkaddr, &sum, seg); | |
bfad7c2d JK |
585 | |
586 | /* direct IO doesn't use extent cache to maximize the performance */ | |
41ef94b3 | 587 | __set_data_blkaddr(dn); |
bfad7c2d | 588 | |
976e4c50 JK |
589 | /* update i_size */ |
590 | fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) + | |
591 | dn->ofs_in_node; | |
592 | if (i_size_read(dn->inode) < ((fofs + 1) << PAGE_CACHE_SHIFT)) | |
593 | i_size_write(dn->inode, ((fofs + 1) << PAGE_CACHE_SHIFT)); | |
594 | ||
bfad7c2d JK |
595 | return 0; |
596 | } | |
597 | ||
59b802e5 JK |
598 | static void __allocate_data_blocks(struct inode *inode, loff_t offset, |
599 | size_t count) | |
600 | { | |
601 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); | |
602 | struct dnode_of_data dn; | |
603 | u64 start = F2FS_BYTES_TO_BLK(offset); | |
604 | u64 len = F2FS_BYTES_TO_BLK(count); | |
605 | bool allocated; | |
606 | u64 end_offset; | |
607 | ||
608 | while (len) { | |
609 | f2fs_balance_fs(sbi); | |
610 | f2fs_lock_op(sbi); | |
611 | ||
612 | /* When reading holes, we need its node page */ | |
613 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
614 | if (get_dnode_of_data(&dn, start, ALLOC_NODE)) | |
615 | goto out; | |
616 | ||
617 | allocated = false; | |
618 | end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode)); | |
619 | ||
620 | while (dn.ofs_in_node < end_offset && len) { | |
621 | if (dn.data_blkaddr == NULL_ADDR) { | |
622 | if (__allocate_data_block(&dn)) | |
623 | goto sync_out; | |
624 | allocated = true; | |
625 | } | |
626 | len--; | |
627 | start++; | |
628 | dn.ofs_in_node++; | |
629 | } | |
630 | ||
631 | if (allocated) | |
632 | sync_inode_page(&dn); | |
633 | ||
634 | f2fs_put_dnode(&dn); | |
635 | f2fs_unlock_op(sbi); | |
636 | } | |
637 | return; | |
638 | ||
639 | sync_out: | |
640 | if (allocated) | |
641 | sync_inode_page(&dn); | |
642 | f2fs_put_dnode(&dn); | |
643 | out: | |
644 | f2fs_unlock_op(sbi); | |
645 | return; | |
646 | } | |
647 | ||
0a8165d7 | 648 | /* |
4f4124d0 CY |
649 | * get_data_block() now supported readahead/bmap/rw direct_IO with mapped bh. |
650 | * If original data blocks are allocated, then give them to blockdev. | |
651 | * Otherwise, | |
652 | * a. preallocate requested block addresses | |
653 | * b. do not use extent cache for better performance | |
654 | * c. give the block addresses to blockdev | |
eb47b800 | 655 | */ |
ccfb3000 JK |
656 | static int __get_data_block(struct inode *inode, sector_t iblock, |
657 | struct buffer_head *bh_result, int create, bool fiemap) | |
eb47b800 JK |
658 | { |
659 | unsigned int blkbits = inode->i_sb->s_blocksize_bits; | |
660 | unsigned maxblocks = bh_result->b_size >> blkbits; | |
661 | struct dnode_of_data dn; | |
bfad7c2d JK |
662 | int mode = create ? ALLOC_NODE : LOOKUP_NODE_RA; |
663 | pgoff_t pgofs, end_offset; | |
664 | int err = 0, ofs = 1; | |
a2e7d1bf | 665 | struct extent_info ei; |
bfad7c2d | 666 | bool allocated = false; |
eb47b800 JK |
667 | |
668 | /* Get the page offset from the block offset(iblock) */ | |
669 | pgofs = (pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits)); | |
670 | ||
a2e7d1bf CY |
671 | if (check_extent_cache(inode, pgofs, &ei)) { |
672 | f2fs_map_bh(inode->i_sb, pgofs, &ei, bh_result); | |
bfad7c2d | 673 | goto out; |
a2e7d1bf | 674 | } |
bfad7c2d | 675 | |
59b802e5 | 676 | if (create) |
4081363f | 677 | f2fs_lock_op(F2FS_I_SB(inode)); |
eb47b800 JK |
678 | |
679 | /* When reading holes, we need its node page */ | |
680 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
bfad7c2d | 681 | err = get_dnode_of_data(&dn, pgofs, mode); |
1ec79083 | 682 | if (err) { |
bfad7c2d JK |
683 | if (err == -ENOENT) |
684 | err = 0; | |
685 | goto unlock_out; | |
848753aa | 686 | } |
ccfb3000 | 687 | if (dn.data_blkaddr == NEW_ADDR && !fiemap) |
1ec79083 | 688 | goto put_out; |
eb47b800 | 689 | |
bfad7c2d | 690 | if (dn.data_blkaddr != NULL_ADDR) { |
da17eece | 691 | set_buffer_new(bh_result); |
bfad7c2d JK |
692 | map_bh(bh_result, inode->i_sb, dn.data_blkaddr); |
693 | } else if (create) { | |
694 | err = __allocate_data_block(&dn); | |
695 | if (err) | |
696 | goto put_out; | |
697 | allocated = true; | |
da17eece | 698 | set_buffer_new(bh_result); |
bfad7c2d JK |
699 | map_bh(bh_result, inode->i_sb, dn.data_blkaddr); |
700 | } else { | |
701 | goto put_out; | |
702 | } | |
703 | ||
6403eb1f | 704 | end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode)); |
bfad7c2d JK |
705 | bh_result->b_size = (((size_t)1) << blkbits); |
706 | dn.ofs_in_node++; | |
707 | pgofs++; | |
708 | ||
709 | get_next: | |
710 | if (dn.ofs_in_node >= end_offset) { | |
711 | if (allocated) | |
712 | sync_inode_page(&dn); | |
713 | allocated = false; | |
714 | f2fs_put_dnode(&dn); | |
715 | ||
716 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
717 | err = get_dnode_of_data(&dn, pgofs, mode); | |
1ec79083 | 718 | if (err) { |
bfad7c2d JK |
719 | if (err == -ENOENT) |
720 | err = 0; | |
721 | goto unlock_out; | |
722 | } | |
ccfb3000 | 723 | if (dn.data_blkaddr == NEW_ADDR && !fiemap) |
1ec79083 JK |
724 | goto put_out; |
725 | ||
6403eb1f | 726 | end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode)); |
bfad7c2d | 727 | } |
eb47b800 | 728 | |
bfad7c2d JK |
729 | if (maxblocks > (bh_result->b_size >> blkbits)) { |
730 | block_t blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node); | |
731 | if (blkaddr == NULL_ADDR && create) { | |
732 | err = __allocate_data_block(&dn); | |
733 | if (err) | |
734 | goto sync_out; | |
735 | allocated = true; | |
736 | blkaddr = dn.data_blkaddr; | |
737 | } | |
e1c42045 | 738 | /* Give more consecutive addresses for the readahead */ |
bfad7c2d JK |
739 | if (blkaddr == (bh_result->b_blocknr + ofs)) { |
740 | ofs++; | |
741 | dn.ofs_in_node++; | |
742 | pgofs++; | |
743 | bh_result->b_size += (((size_t)1) << blkbits); | |
744 | goto get_next; | |
745 | } | |
eb47b800 | 746 | } |
bfad7c2d JK |
747 | sync_out: |
748 | if (allocated) | |
749 | sync_inode_page(&dn); | |
750 | put_out: | |
eb47b800 | 751 | f2fs_put_dnode(&dn); |
bfad7c2d JK |
752 | unlock_out: |
753 | if (create) | |
4081363f | 754 | f2fs_unlock_op(F2FS_I_SB(inode)); |
bfad7c2d JK |
755 | out: |
756 | trace_f2fs_get_data_block(inode, iblock, bh_result, err); | |
757 | return err; | |
eb47b800 JK |
758 | } |
759 | ||
ccfb3000 JK |
760 | static int get_data_block(struct inode *inode, sector_t iblock, |
761 | struct buffer_head *bh_result, int create) | |
762 | { | |
763 | return __get_data_block(inode, iblock, bh_result, create, false); | |
764 | } | |
765 | ||
766 | static int get_data_block_fiemap(struct inode *inode, sector_t iblock, | |
767 | struct buffer_head *bh_result, int create) | |
768 | { | |
769 | return __get_data_block(inode, iblock, bh_result, create, true); | |
770 | } | |
771 | ||
9ab70134 JK |
772 | int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
773 | u64 start, u64 len) | |
774 | { | |
ccfb3000 JK |
775 | return generic_block_fiemap(inode, fieinfo, |
776 | start, len, get_data_block_fiemap); | |
9ab70134 JK |
777 | } |
778 | ||
eb47b800 JK |
779 | static int f2fs_read_data_page(struct file *file, struct page *page) |
780 | { | |
9ffe0fb5 | 781 | struct inode *inode = page->mapping->host; |
b3d208f9 | 782 | int ret = -EAGAIN; |
9ffe0fb5 | 783 | |
c20e89cd CY |
784 | trace_f2fs_readpage(page, DATA); |
785 | ||
e1c42045 | 786 | /* If the file has inline data, try to read it directly */ |
9ffe0fb5 HL |
787 | if (f2fs_has_inline_data(inode)) |
788 | ret = f2fs_read_inline_data(inode, page); | |
b3d208f9 | 789 | if (ret == -EAGAIN) |
9ffe0fb5 HL |
790 | ret = mpage_readpage(page, get_data_block); |
791 | ||
792 | return ret; | |
eb47b800 JK |
793 | } |
794 | ||
795 | static int f2fs_read_data_pages(struct file *file, | |
796 | struct address_space *mapping, | |
797 | struct list_head *pages, unsigned nr_pages) | |
798 | { | |
9ffe0fb5 HL |
799 | struct inode *inode = file->f_mapping->host; |
800 | ||
801 | /* If the file has inline data, skip readpages */ | |
802 | if (f2fs_has_inline_data(inode)) | |
803 | return 0; | |
804 | ||
bfad7c2d | 805 | return mpage_readpages(mapping, pages, nr_pages, get_data_block); |
eb47b800 JK |
806 | } |
807 | ||
458e6197 | 808 | int do_write_data_page(struct page *page, struct f2fs_io_info *fio) |
eb47b800 JK |
809 | { |
810 | struct inode *inode = page->mapping->host; | |
eb47b800 JK |
811 | struct dnode_of_data dn; |
812 | int err = 0; | |
813 | ||
814 | set_new_dnode(&dn, inode, NULL, NULL, 0); | |
266e97a8 | 815 | err = get_dnode_of_data(&dn, page->index, LOOKUP_NODE); |
eb47b800 JK |
816 | if (err) |
817 | return err; | |
818 | ||
cf04e8eb | 819 | fio->blk_addr = dn.data_blkaddr; |
eb47b800 JK |
820 | |
821 | /* This page is already truncated */ | |
cf04e8eb | 822 | if (fio->blk_addr == NULL_ADDR) |
eb47b800 JK |
823 | goto out_writepage; |
824 | ||
825 | set_page_writeback(page); | |
826 | ||
827 | /* | |
828 | * If current allocation needs SSR, | |
829 | * it had better in-place writes for updated data. | |
830 | */ | |
cf04e8eb | 831 | if (unlikely(fio->blk_addr != NEW_ADDR && |
b25958b6 HL |
832 | !is_cold_data(page) && |
833 | need_inplace_update(inode))) { | |
cf04e8eb | 834 | rewrite_data_page(page, fio); |
fff04f90 | 835 | set_inode_flag(F2FS_I(inode), FI_UPDATE_WRITE); |
eb47b800 | 836 | } else { |
cf04e8eb | 837 | write_data_page(page, &dn, fio); |
e1509cf2 | 838 | update_extent_cache(&dn); |
fff04f90 | 839 | set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE); |
eb47b800 JK |
840 | } |
841 | out_writepage: | |
842 | f2fs_put_dnode(&dn); | |
843 | return err; | |
844 | } | |
845 | ||
846 | static int f2fs_write_data_page(struct page *page, | |
847 | struct writeback_control *wbc) | |
848 | { | |
849 | struct inode *inode = page->mapping->host; | |
4081363f | 850 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
eb47b800 JK |
851 | loff_t i_size = i_size_read(inode); |
852 | const pgoff_t end_index = ((unsigned long long) i_size) | |
853 | >> PAGE_CACHE_SHIFT; | |
9ffe0fb5 | 854 | unsigned offset = 0; |
39936837 | 855 | bool need_balance_fs = false; |
eb47b800 | 856 | int err = 0; |
458e6197 JK |
857 | struct f2fs_io_info fio = { |
858 | .type = DATA, | |
6c311ec6 | 859 | .rw = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : WRITE, |
458e6197 | 860 | }; |
eb47b800 | 861 | |
ecda0de3 CY |
862 | trace_f2fs_writepage(page, DATA); |
863 | ||
eb47b800 | 864 | if (page->index < end_index) |
39936837 | 865 | goto write; |
eb47b800 JK |
866 | |
867 | /* | |
868 | * If the offset is out-of-range of file size, | |
869 | * this page does not have to be written to disk. | |
870 | */ | |
871 | offset = i_size & (PAGE_CACHE_SIZE - 1); | |
76f60268 | 872 | if ((page->index >= end_index + 1) || !offset) |
39936837 | 873 | goto out; |
eb47b800 JK |
874 | |
875 | zero_user_segment(page, offset, PAGE_CACHE_SIZE); | |
39936837 | 876 | write: |
caf0047e | 877 | if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING))) |
eb47b800 | 878 | goto redirty_out; |
1e84371f JK |
879 | if (f2fs_is_drop_cache(inode)) |
880 | goto out; | |
881 | if (f2fs_is_volatile_file(inode) && !wbc->for_reclaim && | |
882 | available_free_memory(sbi, BASE_CHECK)) | |
883 | goto redirty_out; | |
eb47b800 | 884 | |
39936837 | 885 | /* Dentry blocks are controlled by checkpoint */ |
eb47b800 | 886 | if (S_ISDIR(inode->i_mode)) { |
cf779cab JK |
887 | if (unlikely(f2fs_cp_error(sbi))) |
888 | goto redirty_out; | |
458e6197 | 889 | err = do_write_data_page(page, &fio); |
8618b881 JK |
890 | goto done; |
891 | } | |
9ffe0fb5 | 892 | |
cf779cab JK |
893 | /* we should bypass data pages to proceed the kworkder jobs */ |
894 | if (unlikely(f2fs_cp_error(sbi))) { | |
895 | SetPageError(page); | |
a7ffdbe2 | 896 | goto out; |
cf779cab JK |
897 | } |
898 | ||
8618b881 | 899 | if (!wbc->for_reclaim) |
39936837 | 900 | need_balance_fs = true; |
8618b881 | 901 | else if (has_not_enough_free_secs(sbi, 0)) |
39936837 | 902 | goto redirty_out; |
eb47b800 | 903 | |
b3d208f9 | 904 | err = -EAGAIN; |
8618b881 | 905 | f2fs_lock_op(sbi); |
b3d208f9 JK |
906 | if (f2fs_has_inline_data(inode)) |
907 | err = f2fs_write_inline_data(inode, page); | |
908 | if (err == -EAGAIN) | |
8618b881 JK |
909 | err = do_write_data_page(page, &fio); |
910 | f2fs_unlock_op(sbi); | |
911 | done: | |
912 | if (err && err != -ENOENT) | |
913 | goto redirty_out; | |
eb47b800 | 914 | |
eb47b800 | 915 | clear_cold_data(page); |
39936837 | 916 | out: |
a7ffdbe2 | 917 | inode_dec_dirty_pages(inode); |
eb47b800 | 918 | unlock_page(page); |
39936837 | 919 | if (need_balance_fs) |
eb47b800 | 920 | f2fs_balance_fs(sbi); |
2aea39ec JK |
921 | if (wbc->for_reclaim) |
922 | f2fs_submit_merged_bio(sbi, DATA, WRITE); | |
eb47b800 JK |
923 | return 0; |
924 | ||
eb47b800 | 925 | redirty_out: |
76f60268 | 926 | redirty_page_for_writepage(wbc, page); |
8618b881 | 927 | return AOP_WRITEPAGE_ACTIVATE; |
eb47b800 JK |
928 | } |
929 | ||
fa9150a8 NJ |
930 | static int __f2fs_writepage(struct page *page, struct writeback_control *wbc, |
931 | void *data) | |
932 | { | |
933 | struct address_space *mapping = data; | |
934 | int ret = mapping->a_ops->writepage(page, wbc); | |
935 | mapping_set_error(mapping, ret); | |
936 | return ret; | |
937 | } | |
938 | ||
25ca923b | 939 | static int f2fs_write_data_pages(struct address_space *mapping, |
eb47b800 JK |
940 | struct writeback_control *wbc) |
941 | { | |
942 | struct inode *inode = mapping->host; | |
4081363f | 943 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
531ad7d5 | 944 | bool locked = false; |
eb47b800 | 945 | int ret; |
50c8cdb3 | 946 | long diff; |
eb47b800 | 947 | |
e5748434 CY |
948 | trace_f2fs_writepages(mapping->host, wbc, DATA); |
949 | ||
cfb185a1 | 950 | /* deal with chardevs and other special file */ |
951 | if (!mapping->a_ops->writepage) | |
952 | return 0; | |
953 | ||
87d6f890 | 954 | if (S_ISDIR(inode->i_mode) && wbc->sync_mode == WB_SYNC_NONE && |
a7ffdbe2 | 955 | get_dirty_pages(inode) < nr_pages_to_skip(sbi, DATA) && |
6fb03f3a | 956 | available_free_memory(sbi, DIRTY_DENTS)) |
d3baf95d | 957 | goto skip_write; |
87d6f890 | 958 | |
50c8cdb3 | 959 | diff = nr_pages_to_write(sbi, DATA, wbc); |
eb47b800 | 960 | |
531ad7d5 | 961 | if (!S_ISDIR(inode->i_mode)) { |
eb47b800 | 962 | mutex_lock(&sbi->writepages); |
531ad7d5 JK |
963 | locked = true; |
964 | } | |
fa9150a8 | 965 | ret = write_cache_pages(mapping, wbc, __f2fs_writepage, mapping); |
531ad7d5 | 966 | if (locked) |
eb47b800 | 967 | mutex_unlock(&sbi->writepages); |
458e6197 JK |
968 | |
969 | f2fs_submit_merged_bio(sbi, DATA, WRITE); | |
eb47b800 JK |
970 | |
971 | remove_dirty_dir_inode(inode); | |
972 | ||
50c8cdb3 | 973 | wbc->nr_to_write = max((long)0, wbc->nr_to_write - diff); |
eb47b800 | 974 | return ret; |
d3baf95d JK |
975 | |
976 | skip_write: | |
a7ffdbe2 | 977 | wbc->pages_skipped += get_dirty_pages(inode); |
d3baf95d | 978 | return 0; |
eb47b800 JK |
979 | } |
980 | ||
3aab8f82 CY |
981 | static void f2fs_write_failed(struct address_space *mapping, loff_t to) |
982 | { | |
983 | struct inode *inode = mapping->host; | |
984 | ||
985 | if (to > inode->i_size) { | |
986 | truncate_pagecache(inode, inode->i_size); | |
764aa3e9 | 987 | truncate_blocks(inode, inode->i_size, true); |
3aab8f82 CY |
988 | } |
989 | } | |
990 | ||
eb47b800 JK |
991 | static int f2fs_write_begin(struct file *file, struct address_space *mapping, |
992 | loff_t pos, unsigned len, unsigned flags, | |
993 | struct page **pagep, void **fsdata) | |
994 | { | |
995 | struct inode *inode = mapping->host; | |
4081363f | 996 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
9ba69cf9 | 997 | struct page *page, *ipage; |
eb47b800 JK |
998 | pgoff_t index = ((unsigned long long) pos) >> PAGE_CACHE_SHIFT; |
999 | struct dnode_of_data dn; | |
1000 | int err = 0; | |
1001 | ||
62aed044 CY |
1002 | trace_f2fs_write_begin(inode, pos, len, flags); |
1003 | ||
eb47b800 | 1004 | f2fs_balance_fs(sbi); |
5f727395 JK |
1005 | |
1006 | /* | |
1007 | * We should check this at this moment to avoid deadlock on inode page | |
1008 | * and #0 page. The locking rule for inline_data conversion should be: | |
1009 | * lock_page(page #0) -> lock_page(inode_page) | |
1010 | */ | |
1011 | if (index != 0) { | |
1012 | err = f2fs_convert_inline_inode(inode); | |
1013 | if (err) | |
1014 | goto fail; | |
1015 | } | |
afcb7ca0 | 1016 | repeat: |
eb47b800 | 1017 | page = grab_cache_page_write_begin(mapping, index, flags); |
3aab8f82 CY |
1018 | if (!page) { |
1019 | err = -ENOMEM; | |
1020 | goto fail; | |
1021 | } | |
d5f66990 | 1022 | |
eb47b800 JK |
1023 | *pagep = page; |
1024 | ||
e479556b | 1025 | f2fs_lock_op(sbi); |
9ba69cf9 JK |
1026 | |
1027 | /* check inline_data */ | |
1028 | ipage = get_node_page(sbi, inode->i_ino); | |
cd34e296 CY |
1029 | if (IS_ERR(ipage)) { |
1030 | err = PTR_ERR(ipage); | |
9ba69cf9 | 1031 | goto unlock_fail; |
cd34e296 | 1032 | } |
9ba69cf9 | 1033 | |
b3d208f9 JK |
1034 | set_new_dnode(&dn, inode, ipage, ipage, 0); |
1035 | ||
9ba69cf9 | 1036 | if (f2fs_has_inline_data(inode)) { |
b3d208f9 JK |
1037 | if (pos + len <= MAX_INLINE_DATA) { |
1038 | read_inline_data(page, ipage); | |
1039 | set_inode_flag(F2FS_I(inode), FI_DATA_EXIST); | |
1040 | sync_inode_page(&dn); | |
1041 | goto put_next; | |
b3d208f9 | 1042 | } |
5f727395 JK |
1043 | err = f2fs_convert_inline_page(&dn, page); |
1044 | if (err) | |
1045 | goto put_fail; | |
b600965c | 1046 | } |
9ba69cf9 JK |
1047 | err = f2fs_reserve_block(&dn, index); |
1048 | if (err) | |
8cdcb713 | 1049 | goto put_fail; |
b3d208f9 | 1050 | put_next: |
9ba69cf9 JK |
1051 | f2fs_put_dnode(&dn); |
1052 | f2fs_unlock_op(sbi); | |
1053 | ||
eb47b800 JK |
1054 | if ((len == PAGE_CACHE_SIZE) || PageUptodate(page)) |
1055 | return 0; | |
1056 | ||
b3d208f9 JK |
1057 | f2fs_wait_on_page_writeback(page, DATA); |
1058 | ||
eb47b800 JK |
1059 | if ((pos & PAGE_CACHE_MASK) >= i_size_read(inode)) { |
1060 | unsigned start = pos & (PAGE_CACHE_SIZE - 1); | |
1061 | unsigned end = start + len; | |
1062 | ||
1063 | /* Reading beyond i_size is simple: memset to zero */ | |
1064 | zero_user_segments(page, 0, start, end, PAGE_CACHE_SIZE); | |
393ff91f | 1065 | goto out; |
eb47b800 JK |
1066 | } |
1067 | ||
b3d208f9 | 1068 | if (dn.data_blkaddr == NEW_ADDR) { |
eb47b800 JK |
1069 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); |
1070 | } else { | |
cf04e8eb JK |
1071 | struct f2fs_io_info fio = { |
1072 | .type = DATA, | |
1073 | .rw = READ_SYNC, | |
1074 | .blk_addr = dn.data_blkaddr, | |
1075 | }; | |
1076 | err = f2fs_submit_page_bio(sbi, page, &fio); | |
9234f319 JK |
1077 | if (err) |
1078 | goto fail; | |
d54c795b | 1079 | |
393ff91f | 1080 | lock_page(page); |
6bacf52f | 1081 | if (unlikely(!PageUptodate(page))) { |
393ff91f | 1082 | f2fs_put_page(page, 1); |
3aab8f82 CY |
1083 | err = -EIO; |
1084 | goto fail; | |
eb47b800 | 1085 | } |
6bacf52f | 1086 | if (unlikely(page->mapping != mapping)) { |
afcb7ca0 JK |
1087 | f2fs_put_page(page, 1); |
1088 | goto repeat; | |
eb47b800 JK |
1089 | } |
1090 | } | |
393ff91f | 1091 | out: |
eb47b800 JK |
1092 | SetPageUptodate(page); |
1093 | clear_cold_data(page); | |
1094 | return 0; | |
9ba69cf9 | 1095 | |
8cdcb713 JK |
1096 | put_fail: |
1097 | f2fs_put_dnode(&dn); | |
9ba69cf9 JK |
1098 | unlock_fail: |
1099 | f2fs_unlock_op(sbi); | |
b3d208f9 | 1100 | f2fs_put_page(page, 1); |
3aab8f82 CY |
1101 | fail: |
1102 | f2fs_write_failed(mapping, pos + len); | |
1103 | return err; | |
eb47b800 JK |
1104 | } |
1105 | ||
a1dd3c13 JK |
1106 | static int f2fs_write_end(struct file *file, |
1107 | struct address_space *mapping, | |
1108 | loff_t pos, unsigned len, unsigned copied, | |
1109 | struct page *page, void *fsdata) | |
1110 | { | |
1111 | struct inode *inode = page->mapping->host; | |
1112 | ||
dfb2bf38 CY |
1113 | trace_f2fs_write_end(inode, pos, len, copied); |
1114 | ||
34ba94ba | 1115 | set_page_dirty(page); |
a1dd3c13 JK |
1116 | |
1117 | if (pos + copied > i_size_read(inode)) { | |
1118 | i_size_write(inode, pos + copied); | |
1119 | mark_inode_dirty(inode); | |
1120 | update_inode_page(inode); | |
1121 | } | |
1122 | ||
75c3c8bc | 1123 | f2fs_put_page(page, 1); |
a1dd3c13 JK |
1124 | return copied; |
1125 | } | |
1126 | ||
944fcfc1 | 1127 | static int check_direct_IO(struct inode *inode, int rw, |
5b46f25d | 1128 | struct iov_iter *iter, loff_t offset) |
944fcfc1 JK |
1129 | { |
1130 | unsigned blocksize_mask = inode->i_sb->s_blocksize - 1; | |
944fcfc1 JK |
1131 | |
1132 | if (rw == READ) | |
1133 | return 0; | |
1134 | ||
1135 | if (offset & blocksize_mask) | |
1136 | return -EINVAL; | |
1137 | ||
5b46f25d AV |
1138 | if (iov_iter_alignment(iter) & blocksize_mask) |
1139 | return -EINVAL; | |
1140 | ||
944fcfc1 JK |
1141 | return 0; |
1142 | } | |
1143 | ||
eb47b800 | 1144 | static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb, |
d8d3d94b | 1145 | struct iov_iter *iter, loff_t offset) |
eb47b800 JK |
1146 | { |
1147 | struct file *file = iocb->ki_filp; | |
3aab8f82 CY |
1148 | struct address_space *mapping = file->f_mapping; |
1149 | struct inode *inode = mapping->host; | |
1150 | size_t count = iov_iter_count(iter); | |
1151 | int err; | |
944fcfc1 | 1152 | |
b3d208f9 JK |
1153 | /* we don't need to use inline_data strictly */ |
1154 | if (f2fs_has_inline_data(inode)) { | |
1155 | err = f2fs_convert_inline_inode(inode); | |
1156 | if (err) | |
1157 | return err; | |
1158 | } | |
9ffe0fb5 | 1159 | |
5b46f25d | 1160 | if (check_direct_IO(inode, rw, iter, offset)) |
944fcfc1 JK |
1161 | return 0; |
1162 | ||
70407fad CY |
1163 | trace_f2fs_direct_IO_enter(inode, offset, count, rw); |
1164 | ||
59b802e5 JK |
1165 | if (rw & WRITE) |
1166 | __allocate_data_blocks(inode, offset, count); | |
1167 | ||
3aab8f82 CY |
1168 | err = blockdev_direct_IO(rw, iocb, inode, iter, offset, get_data_block); |
1169 | if (err < 0 && (rw & WRITE)) | |
1170 | f2fs_write_failed(mapping, offset + count); | |
70407fad CY |
1171 | |
1172 | trace_f2fs_direct_IO_exit(inode, offset, count, rw, err); | |
1173 | ||
3aab8f82 | 1174 | return err; |
eb47b800 JK |
1175 | } |
1176 | ||
487261f3 CY |
1177 | void f2fs_invalidate_page(struct page *page, unsigned int offset, |
1178 | unsigned int length) | |
eb47b800 JK |
1179 | { |
1180 | struct inode *inode = page->mapping->host; | |
487261f3 | 1181 | struct f2fs_sb_info *sbi = F2FS_I_SB(inode); |
a7ffdbe2 | 1182 | |
487261f3 CY |
1183 | if (inode->i_ino >= F2FS_ROOT_INO(sbi) && |
1184 | (offset % PAGE_CACHE_SIZE || length != PAGE_CACHE_SIZE)) | |
a7ffdbe2 JK |
1185 | return; |
1186 | ||
487261f3 CY |
1187 | if (PageDirty(page)) { |
1188 | if (inode->i_ino == F2FS_META_INO(sbi)) | |
1189 | dec_page_count(sbi, F2FS_DIRTY_META); | |
1190 | else if (inode->i_ino == F2FS_NODE_INO(sbi)) | |
1191 | dec_page_count(sbi, F2FS_DIRTY_NODES); | |
1192 | else | |
1193 | inode_dec_dirty_pages(inode); | |
1194 | } | |
eb47b800 JK |
1195 | ClearPagePrivate(page); |
1196 | } | |
1197 | ||
487261f3 | 1198 | int f2fs_release_page(struct page *page, gfp_t wait) |
eb47b800 | 1199 | { |
f68daeeb JK |
1200 | /* If this is dirty page, keep PagePrivate */ |
1201 | if (PageDirty(page)) | |
1202 | return 0; | |
1203 | ||
eb47b800 | 1204 | ClearPagePrivate(page); |
c3850aa1 | 1205 | return 1; |
eb47b800 JK |
1206 | } |
1207 | ||
1208 | static int f2fs_set_data_page_dirty(struct page *page) | |
1209 | { | |
1210 | struct address_space *mapping = page->mapping; | |
1211 | struct inode *inode = mapping->host; | |
1212 | ||
26c6b887 JK |
1213 | trace_f2fs_set_page_dirty(page, DATA); |
1214 | ||
eb47b800 | 1215 | SetPageUptodate(page); |
34ba94ba | 1216 | |
1e84371f | 1217 | if (f2fs_is_atomic_file(inode)) { |
34ba94ba JK |
1218 | register_inmem_page(inode, page); |
1219 | return 1; | |
1220 | } | |
1221 | ||
a18ff063 JK |
1222 | mark_inode_dirty(inode); |
1223 | ||
eb47b800 JK |
1224 | if (!PageDirty(page)) { |
1225 | __set_page_dirty_nobuffers(page); | |
a7ffdbe2 | 1226 | update_dirty_page(inode, page); |
eb47b800 JK |
1227 | return 1; |
1228 | } | |
1229 | return 0; | |
1230 | } | |
1231 | ||
c01e54b7 JK |
1232 | static sector_t f2fs_bmap(struct address_space *mapping, sector_t block) |
1233 | { | |
454ae7e5 CY |
1234 | struct inode *inode = mapping->host; |
1235 | ||
b3d208f9 JK |
1236 | /* we don't need to use inline_data strictly */ |
1237 | if (f2fs_has_inline_data(inode)) { | |
1238 | int err = f2fs_convert_inline_inode(inode); | |
1239 | if (err) | |
1240 | return err; | |
1241 | } | |
bfad7c2d | 1242 | return generic_block_bmap(mapping, block, get_data_block); |
c01e54b7 JK |
1243 | } |
1244 | ||
eb47b800 JK |
1245 | const struct address_space_operations f2fs_dblock_aops = { |
1246 | .readpage = f2fs_read_data_page, | |
1247 | .readpages = f2fs_read_data_pages, | |
1248 | .writepage = f2fs_write_data_page, | |
1249 | .writepages = f2fs_write_data_pages, | |
1250 | .write_begin = f2fs_write_begin, | |
a1dd3c13 | 1251 | .write_end = f2fs_write_end, |
eb47b800 | 1252 | .set_page_dirty = f2fs_set_data_page_dirty, |
487261f3 CY |
1253 | .invalidatepage = f2fs_invalidate_page, |
1254 | .releasepage = f2fs_release_page, | |
eb47b800 | 1255 | .direct_IO = f2fs_direct_IO, |
c01e54b7 | 1256 | .bmap = f2fs_bmap, |
eb47b800 | 1257 | }; |