Commit | Line | Data |
---|---|---|
0a8165d7 | 1 | /* |
127e670a JK |
2 | * fs/f2fs/checkpoint.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/bio.h> | |
13 | #include <linux/mpage.h> | |
14 | #include <linux/writeback.h> | |
15 | #include <linux/blkdev.h> | |
16 | #include <linux/f2fs_fs.h> | |
17 | #include <linux/pagevec.h> | |
18 | #include <linux/swap.h> | |
19 | ||
20 | #include "f2fs.h" | |
21 | #include "node.h" | |
22 | #include "segment.h" | |
2af4bd6c | 23 | #include <trace/events/f2fs.h> |
127e670a JK |
24 | |
25 | static struct kmem_cache *orphan_entry_slab; | |
26 | static struct kmem_cache *inode_entry_slab; | |
27 | ||
0a8165d7 | 28 | /* |
127e670a JK |
29 | * We guarantee no failure on the returned page. |
30 | */ | |
31 | struct page *grab_meta_page(struct f2fs_sb_info *sbi, pgoff_t index) | |
32 | { | |
9df27d98 | 33 | struct address_space *mapping = META_MAPPING(sbi); |
127e670a JK |
34 | struct page *page = NULL; |
35 | repeat: | |
bde44686 | 36 | page = grab_cache_page(mapping, index); |
127e670a JK |
37 | if (!page) { |
38 | cond_resched(); | |
39 | goto repeat; | |
40 | } | |
bde44686 | 41 | f2fs_wait_on_page_writeback(page, META); |
127e670a JK |
42 | SetPageUptodate(page); |
43 | return page; | |
44 | } | |
45 | ||
0a8165d7 | 46 | /* |
127e670a JK |
47 | * We guarantee no failure on the returned page. |
48 | */ | |
49 | struct page *get_meta_page(struct f2fs_sb_info *sbi, pgoff_t index) | |
50 | { | |
9df27d98 | 51 | struct address_space *mapping = META_MAPPING(sbi); |
127e670a JK |
52 | struct page *page; |
53 | repeat: | |
54 | page = grab_cache_page(mapping, index); | |
55 | if (!page) { | |
56 | cond_resched(); | |
57 | goto repeat; | |
58 | } | |
393ff91f JK |
59 | if (PageUptodate(page)) |
60 | goto out; | |
61 | ||
93dfe2ac JK |
62 | if (f2fs_submit_page_bio(sbi, page, index, |
63 | READ_SYNC | REQ_META | REQ_PRIO)) | |
127e670a | 64 | goto repeat; |
127e670a | 65 | |
393ff91f | 66 | lock_page(page); |
6bacf52f | 67 | if (unlikely(page->mapping != mapping)) { |
afcb7ca0 JK |
68 | f2fs_put_page(page, 1); |
69 | goto repeat; | |
70 | } | |
393ff91f JK |
71 | out: |
72 | mark_page_accessed(page); | |
127e670a JK |
73 | return page; |
74 | } | |
75 | ||
b49ad51e | 76 | static inline int get_max_meta_blks(struct f2fs_sb_info *sbi, int type) |
662befda CY |
77 | { |
78 | switch (type) { | |
79 | case META_NAT: | |
80 | return NM_I(sbi)->max_nid / NAT_ENTRY_PER_BLOCK; | |
81 | case META_SIT: | |
82 | return SIT_BLK_CNT(sbi); | |
81c1a0f1 | 83 | case META_SSA: |
662befda CY |
84 | case META_CP: |
85 | return 0; | |
86 | default: | |
87 | BUG(); | |
88 | } | |
89 | } | |
90 | ||
91 | /* | |
81c1a0f1 | 92 | * Readahead CP/NAT/SIT/SSA pages |
662befda CY |
93 | */ |
94 | int ra_meta_pages(struct f2fs_sb_info *sbi, int start, int nrpages, int type) | |
95 | { | |
96 | block_t prev_blk_addr = 0; | |
97 | struct page *page; | |
98 | int blkno = start; | |
99 | int max_blks = get_max_meta_blks(sbi, type); | |
100 | ||
101 | struct f2fs_io_info fio = { | |
102 | .type = META, | |
103 | .rw = READ_SYNC | REQ_META | REQ_PRIO | |
104 | }; | |
105 | ||
106 | for (; nrpages-- > 0; blkno++) { | |
107 | block_t blk_addr; | |
108 | ||
109 | switch (type) { | |
110 | case META_NAT: | |
111 | /* get nat block addr */ | |
112 | if (unlikely(blkno >= max_blks)) | |
113 | blkno = 0; | |
114 | blk_addr = current_nat_addr(sbi, | |
115 | blkno * NAT_ENTRY_PER_BLOCK); | |
116 | break; | |
117 | case META_SIT: | |
118 | /* get sit block addr */ | |
119 | if (unlikely(blkno >= max_blks)) | |
120 | goto out; | |
121 | blk_addr = current_sit_addr(sbi, | |
122 | blkno * SIT_ENTRY_PER_BLOCK); | |
123 | if (blkno != start && prev_blk_addr + 1 != blk_addr) | |
124 | goto out; | |
125 | prev_blk_addr = blk_addr; | |
126 | break; | |
81c1a0f1 | 127 | case META_SSA: |
662befda | 128 | case META_CP: |
81c1a0f1 | 129 | /* get ssa/cp block addr */ |
662befda CY |
130 | blk_addr = blkno; |
131 | break; | |
132 | default: | |
133 | BUG(); | |
134 | } | |
135 | ||
136 | page = grab_cache_page(META_MAPPING(sbi), blk_addr); | |
137 | if (!page) | |
138 | continue; | |
139 | if (PageUptodate(page)) { | |
140 | mark_page_accessed(page); | |
141 | f2fs_put_page(page, 1); | |
142 | continue; | |
143 | } | |
144 | ||
145 | f2fs_submit_page_mbio(sbi, page, blk_addr, &fio); | |
146 | mark_page_accessed(page); | |
147 | f2fs_put_page(page, 0); | |
148 | } | |
149 | out: | |
150 | f2fs_submit_merged_bio(sbi, META, READ); | |
151 | return blkno - start; | |
152 | } | |
153 | ||
127e670a JK |
154 | static int f2fs_write_meta_page(struct page *page, |
155 | struct writeback_control *wbc) | |
156 | { | |
157 | struct inode *inode = page->mapping->host; | |
158 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
127e670a | 159 | |
ecda0de3 CY |
160 | trace_f2fs_writepage(page, META); |
161 | ||
203681f6 | 162 | if (unlikely(sbi->por_doing)) |
cfb271d4 | 163 | goto redirty_out; |
cfb271d4 CY |
164 | if (wbc->for_reclaim) |
165 | goto redirty_out; | |
127e670a | 166 | |
203681f6 JK |
167 | /* Should not write any meta pages, if any IO error was occurred */ |
168 | if (unlikely(is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ERROR_FLAG))) | |
169 | goto no_write; | |
127e670a | 170 | |
3cb5ad15 | 171 | f2fs_wait_on_page_writeback(page, META); |
577e3495 | 172 | write_meta_page(sbi, page); |
203681f6 | 173 | no_write: |
577e3495 JK |
174 | dec_page_count(sbi, F2FS_DIRTY_META); |
175 | unlock_page(page); | |
176 | return 0; | |
cfb271d4 CY |
177 | |
178 | redirty_out: | |
76f60268 | 179 | redirty_page_for_writepage(wbc, page); |
cfb271d4 | 180 | return AOP_WRITEPAGE_ACTIVATE; |
127e670a JK |
181 | } |
182 | ||
183 | static int f2fs_write_meta_pages(struct address_space *mapping, | |
184 | struct writeback_control *wbc) | |
185 | { | |
186 | struct f2fs_sb_info *sbi = F2FS_SB(mapping->host->i_sb); | |
50c8cdb3 | 187 | long diff, written; |
127e670a | 188 | |
e5748434 CY |
189 | trace_f2fs_writepages(mapping->host, wbc, META); |
190 | ||
5459aa97 | 191 | /* collect a number of dirty meta pages and write together */ |
50c8cdb3 JK |
192 | if (wbc->for_kupdate || |
193 | get_pages(sbi, F2FS_DIRTY_META) < nr_pages_to_skip(sbi, META)) | |
d3baf95d | 194 | goto skip_write; |
127e670a JK |
195 | |
196 | /* if mounting is failed, skip writing node pages */ | |
197 | mutex_lock(&sbi->cp_mutex); | |
50c8cdb3 JK |
198 | diff = nr_pages_to_write(sbi, META, wbc); |
199 | written = sync_meta_pages(sbi, META, wbc->nr_to_write); | |
127e670a | 200 | mutex_unlock(&sbi->cp_mutex); |
50c8cdb3 | 201 | wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff); |
127e670a | 202 | return 0; |
d3baf95d JK |
203 | |
204 | skip_write: | |
205 | wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_META); | |
206 | return 0; | |
127e670a JK |
207 | } |
208 | ||
209 | long sync_meta_pages(struct f2fs_sb_info *sbi, enum page_type type, | |
210 | long nr_to_write) | |
211 | { | |
9df27d98 | 212 | struct address_space *mapping = META_MAPPING(sbi); |
127e670a JK |
213 | pgoff_t index = 0, end = LONG_MAX; |
214 | struct pagevec pvec; | |
215 | long nwritten = 0; | |
216 | struct writeback_control wbc = { | |
217 | .for_reclaim = 0, | |
218 | }; | |
219 | ||
220 | pagevec_init(&pvec, 0); | |
221 | ||
222 | while (index <= end) { | |
223 | int i, nr_pages; | |
224 | nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
225 | PAGECACHE_TAG_DIRTY, | |
226 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1); | |
cfb271d4 | 227 | if (unlikely(nr_pages == 0)) |
127e670a JK |
228 | break; |
229 | ||
230 | for (i = 0; i < nr_pages; i++) { | |
231 | struct page *page = pvec.pages[i]; | |
203681f6 | 232 | |
127e670a | 233 | lock_page(page); |
203681f6 JK |
234 | |
235 | if (unlikely(page->mapping != mapping)) { | |
236 | continue_unlock: | |
237 | unlock_page(page); | |
238 | continue; | |
239 | } | |
240 | if (!PageDirty(page)) { | |
241 | /* someone wrote it for us */ | |
242 | goto continue_unlock; | |
243 | } | |
244 | ||
245 | if (!clear_page_dirty_for_io(page)) | |
246 | goto continue_unlock; | |
247 | ||
577e3495 JK |
248 | if (f2fs_write_meta_page(page, &wbc)) { |
249 | unlock_page(page); | |
250 | break; | |
251 | } | |
cfb271d4 CY |
252 | nwritten++; |
253 | if (unlikely(nwritten >= nr_to_write)) | |
127e670a JK |
254 | break; |
255 | } | |
256 | pagevec_release(&pvec); | |
257 | cond_resched(); | |
258 | } | |
259 | ||
260 | if (nwritten) | |
458e6197 | 261 | f2fs_submit_merged_bio(sbi, type, WRITE); |
127e670a JK |
262 | |
263 | return nwritten; | |
264 | } | |
265 | ||
266 | static int f2fs_set_meta_page_dirty(struct page *page) | |
267 | { | |
268 | struct address_space *mapping = page->mapping; | |
269 | struct f2fs_sb_info *sbi = F2FS_SB(mapping->host->i_sb); | |
270 | ||
26c6b887 JK |
271 | trace_f2fs_set_page_dirty(page, META); |
272 | ||
127e670a JK |
273 | SetPageUptodate(page); |
274 | if (!PageDirty(page)) { | |
275 | __set_page_dirty_nobuffers(page); | |
276 | inc_page_count(sbi, F2FS_DIRTY_META); | |
127e670a JK |
277 | return 1; |
278 | } | |
279 | return 0; | |
280 | } | |
281 | ||
282 | const struct address_space_operations f2fs_meta_aops = { | |
283 | .writepage = f2fs_write_meta_page, | |
284 | .writepages = f2fs_write_meta_pages, | |
285 | .set_page_dirty = f2fs_set_meta_page_dirty, | |
286 | }; | |
287 | ||
cbd56e7d | 288 | int acquire_orphan_inode(struct f2fs_sb_info *sbi) |
127e670a | 289 | { |
127e670a JK |
290 | int err = 0; |
291 | ||
17b692f6 | 292 | spin_lock(&sbi->orphan_inode_lock); |
0d47c1ad | 293 | if (unlikely(sbi->n_orphans >= sbi->max_orphans)) |
127e670a | 294 | err = -ENOSPC; |
cbd56e7d JK |
295 | else |
296 | sbi->n_orphans++; | |
17b692f6 | 297 | spin_unlock(&sbi->orphan_inode_lock); |
0d47c1ad | 298 | |
127e670a JK |
299 | return err; |
300 | } | |
301 | ||
cbd56e7d JK |
302 | void release_orphan_inode(struct f2fs_sb_info *sbi) |
303 | { | |
17b692f6 | 304 | spin_lock(&sbi->orphan_inode_lock); |
5d56b671 | 305 | f2fs_bug_on(sbi->n_orphans == 0); |
cbd56e7d | 306 | sbi->n_orphans--; |
17b692f6 | 307 | spin_unlock(&sbi->orphan_inode_lock); |
cbd56e7d JK |
308 | } |
309 | ||
127e670a JK |
310 | void add_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino) |
311 | { | |
2d7b822a CY |
312 | struct list_head *head; |
313 | struct orphan_inode_entry *new, *orphan; | |
127e670a | 314 | |
c1ef3725 GZ |
315 | new = f2fs_kmem_cache_alloc(orphan_entry_slab, GFP_ATOMIC); |
316 | new->ino = ino; | |
317 | ||
17b692f6 | 318 | spin_lock(&sbi->orphan_inode_lock); |
127e670a | 319 | head = &sbi->orphan_inode_list; |
2d7b822a | 320 | list_for_each_entry(orphan, head, list) { |
c1ef3725 | 321 | if (orphan->ino == ino) { |
17b692f6 | 322 | spin_unlock(&sbi->orphan_inode_lock); |
c1ef3725 GZ |
323 | kmem_cache_free(orphan_entry_slab, new); |
324 | return; | |
325 | } | |
326 | ||
127e670a JK |
327 | if (orphan->ino > ino) |
328 | break; | |
127e670a | 329 | } |
7bd59381 | 330 | |
2d7b822a CY |
331 | /* add new orphan entry into list which is sorted by inode number */ |
332 | list_add_tail(&new->list, &orphan->list); | |
17b692f6 | 333 | spin_unlock(&sbi->orphan_inode_lock); |
127e670a JK |
334 | } |
335 | ||
336 | void remove_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino) | |
337 | { | |
60ed9a0f | 338 | struct list_head *head; |
127e670a JK |
339 | struct orphan_inode_entry *orphan; |
340 | ||
17b692f6 | 341 | spin_lock(&sbi->orphan_inode_lock); |
127e670a | 342 | head = &sbi->orphan_inode_list; |
60ed9a0f | 343 | list_for_each_entry(orphan, head, list) { |
127e670a JK |
344 | if (orphan->ino == ino) { |
345 | list_del(&orphan->list); | |
5d56b671 | 346 | f2fs_bug_on(sbi->n_orphans == 0); |
127e670a | 347 | sbi->n_orphans--; |
cf0ee0f0 CY |
348 | spin_unlock(&sbi->orphan_inode_lock); |
349 | kmem_cache_free(orphan_entry_slab, orphan); | |
350 | return; | |
127e670a JK |
351 | } |
352 | } | |
17b692f6 | 353 | spin_unlock(&sbi->orphan_inode_lock); |
127e670a JK |
354 | } |
355 | ||
356 | static void recover_orphan_inode(struct f2fs_sb_info *sbi, nid_t ino) | |
357 | { | |
358 | struct inode *inode = f2fs_iget(sbi->sb, ino); | |
5d56b671 | 359 | f2fs_bug_on(IS_ERR(inode)); |
127e670a JK |
360 | clear_nlink(inode); |
361 | ||
362 | /* truncate all the data during iput */ | |
363 | iput(inode); | |
364 | } | |
365 | ||
8f99a946 | 366 | void recover_orphan_inodes(struct f2fs_sb_info *sbi) |
127e670a JK |
367 | { |
368 | block_t start_blk, orphan_blkaddr, i, j; | |
369 | ||
25ca923b | 370 | if (!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG)) |
8f99a946 | 371 | return; |
127e670a | 372 | |
aabe5136 | 373 | sbi->por_doing = true; |
1dbe4152 CL |
374 | |
375 | start_blk = __start_cp_addr(sbi) + 1 + | |
376 | le32_to_cpu(F2FS_RAW_SUPER(sbi)->cp_payload); | |
127e670a JK |
377 | orphan_blkaddr = __start_sum_addr(sbi) - 1; |
378 | ||
662befda CY |
379 | ra_meta_pages(sbi, start_blk, orphan_blkaddr, META_CP); |
380 | ||
127e670a JK |
381 | for (i = 0; i < orphan_blkaddr; i++) { |
382 | struct page *page = get_meta_page(sbi, start_blk + i); | |
383 | struct f2fs_orphan_block *orphan_blk; | |
384 | ||
385 | orphan_blk = (struct f2fs_orphan_block *)page_address(page); | |
386 | for (j = 0; j < le32_to_cpu(orphan_blk->entry_count); j++) { | |
387 | nid_t ino = le32_to_cpu(orphan_blk->ino[j]); | |
388 | recover_orphan_inode(sbi, ino); | |
389 | } | |
390 | f2fs_put_page(page, 1); | |
391 | } | |
392 | /* clear Orphan Flag */ | |
25ca923b | 393 | clear_ckpt_flags(F2FS_CKPT(sbi), CP_ORPHAN_PRESENT_FLAG); |
aabe5136 | 394 | sbi->por_doing = false; |
8f99a946 | 395 | return; |
127e670a JK |
396 | } |
397 | ||
398 | static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t start_blk) | |
399 | { | |
502c6e0b | 400 | struct list_head *head; |
127e670a | 401 | struct f2fs_orphan_block *orphan_blk = NULL; |
127e670a | 402 | unsigned int nentries = 0; |
4531929e GZ |
403 | unsigned short index; |
404 | unsigned short orphan_blocks = (unsigned short)((sbi->n_orphans + | |
405 | (F2FS_ORPHANS_PER_BLOCK - 1)) / F2FS_ORPHANS_PER_BLOCK); | |
406 | struct page *page = NULL; | |
502c6e0b | 407 | struct orphan_inode_entry *orphan = NULL; |
127e670a | 408 | |
4531929e | 409 | for (index = 0; index < orphan_blocks; index++) |
63f5384c | 410 | grab_meta_page(sbi, start_blk + index); |
127e670a | 411 | |
4531929e | 412 | index = 1; |
17b692f6 | 413 | spin_lock(&sbi->orphan_inode_lock); |
127e670a JK |
414 | head = &sbi->orphan_inode_list; |
415 | ||
416 | /* loop for each orphan inode entry and write them in Jornal block */ | |
502c6e0b GZ |
417 | list_for_each_entry(orphan, head, list) { |
418 | if (!page) { | |
63f5384c GZ |
419 | page = find_get_page(META_MAPPING(sbi), start_blk++); |
420 | f2fs_bug_on(!page); | |
502c6e0b GZ |
421 | orphan_blk = |
422 | (struct f2fs_orphan_block *)page_address(page); | |
423 | memset(orphan_blk, 0, sizeof(*orphan_blk)); | |
63f5384c | 424 | f2fs_put_page(page, 0); |
502c6e0b | 425 | } |
127e670a | 426 | |
36795567 | 427 | orphan_blk->ino[nentries++] = cpu_to_le32(orphan->ino); |
127e670a | 428 | |
36795567 | 429 | if (nentries == F2FS_ORPHANS_PER_BLOCK) { |
127e670a JK |
430 | /* |
431 | * an orphan block is full of 1020 entries, | |
432 | * then we need to flush current orphan blocks | |
433 | * and bring another one in memory | |
434 | */ | |
435 | orphan_blk->blk_addr = cpu_to_le16(index); | |
436 | orphan_blk->blk_count = cpu_to_le16(orphan_blocks); | |
437 | orphan_blk->entry_count = cpu_to_le32(nentries); | |
438 | set_page_dirty(page); | |
439 | f2fs_put_page(page, 1); | |
440 | index++; | |
127e670a JK |
441 | nentries = 0; |
442 | page = NULL; | |
443 | } | |
502c6e0b | 444 | } |
127e670a | 445 | |
502c6e0b GZ |
446 | if (page) { |
447 | orphan_blk->blk_addr = cpu_to_le16(index); | |
448 | orphan_blk->blk_count = cpu_to_le16(orphan_blocks); | |
449 | orphan_blk->entry_count = cpu_to_le32(nentries); | |
450 | set_page_dirty(page); | |
451 | f2fs_put_page(page, 1); | |
127e670a | 452 | } |
502c6e0b | 453 | |
17b692f6 | 454 | spin_unlock(&sbi->orphan_inode_lock); |
127e670a JK |
455 | } |
456 | ||
457 | static struct page *validate_checkpoint(struct f2fs_sb_info *sbi, | |
458 | block_t cp_addr, unsigned long long *version) | |
459 | { | |
460 | struct page *cp_page_1, *cp_page_2 = NULL; | |
461 | unsigned long blk_size = sbi->blocksize; | |
462 | struct f2fs_checkpoint *cp_block; | |
463 | unsigned long long cur_version = 0, pre_version = 0; | |
127e670a | 464 | size_t crc_offset; |
7e586fa0 | 465 | __u32 crc = 0; |
127e670a JK |
466 | |
467 | /* Read the 1st cp block in this CP pack */ | |
468 | cp_page_1 = get_meta_page(sbi, cp_addr); | |
469 | ||
470 | /* get the version number */ | |
471 | cp_block = (struct f2fs_checkpoint *)page_address(cp_page_1); | |
472 | crc_offset = le32_to_cpu(cp_block->checksum_offset); | |
473 | if (crc_offset >= blk_size) | |
474 | goto invalid_cp1; | |
475 | ||
7e586fa0 | 476 | crc = le32_to_cpu(*((__u32 *)((unsigned char *)cp_block + crc_offset))); |
127e670a JK |
477 | if (!f2fs_crc_valid(crc, cp_block, crc_offset)) |
478 | goto invalid_cp1; | |
479 | ||
d71b5564 | 480 | pre_version = cur_cp_version(cp_block); |
127e670a JK |
481 | |
482 | /* Read the 2nd cp block in this CP pack */ | |
25ca923b | 483 | cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1; |
127e670a JK |
484 | cp_page_2 = get_meta_page(sbi, cp_addr); |
485 | ||
486 | cp_block = (struct f2fs_checkpoint *)page_address(cp_page_2); | |
487 | crc_offset = le32_to_cpu(cp_block->checksum_offset); | |
488 | if (crc_offset >= blk_size) | |
489 | goto invalid_cp2; | |
490 | ||
7e586fa0 | 491 | crc = le32_to_cpu(*((__u32 *)((unsigned char *)cp_block + crc_offset))); |
127e670a JK |
492 | if (!f2fs_crc_valid(crc, cp_block, crc_offset)) |
493 | goto invalid_cp2; | |
494 | ||
d71b5564 | 495 | cur_version = cur_cp_version(cp_block); |
127e670a JK |
496 | |
497 | if (cur_version == pre_version) { | |
498 | *version = cur_version; | |
499 | f2fs_put_page(cp_page_2, 1); | |
500 | return cp_page_1; | |
501 | } | |
502 | invalid_cp2: | |
503 | f2fs_put_page(cp_page_2, 1); | |
504 | invalid_cp1: | |
505 | f2fs_put_page(cp_page_1, 1); | |
506 | return NULL; | |
507 | } | |
508 | ||
509 | int get_valid_checkpoint(struct f2fs_sb_info *sbi) | |
510 | { | |
511 | struct f2fs_checkpoint *cp_block; | |
512 | struct f2fs_super_block *fsb = sbi->raw_super; | |
513 | struct page *cp1, *cp2, *cur_page; | |
514 | unsigned long blk_size = sbi->blocksize; | |
515 | unsigned long long cp1_version = 0, cp2_version = 0; | |
516 | unsigned long long cp_start_blk_no; | |
1dbe4152 CL |
517 | unsigned int cp_blks = 1 + le32_to_cpu(F2FS_RAW_SUPER(sbi)->cp_payload); |
518 | block_t cp_blk_no; | |
519 | int i; | |
127e670a | 520 | |
1dbe4152 | 521 | sbi->ckpt = kzalloc(cp_blks * blk_size, GFP_KERNEL); |
127e670a JK |
522 | if (!sbi->ckpt) |
523 | return -ENOMEM; | |
524 | /* | |
525 | * Finding out valid cp block involves read both | |
526 | * sets( cp pack1 and cp pack 2) | |
527 | */ | |
528 | cp_start_blk_no = le32_to_cpu(fsb->cp_blkaddr); | |
529 | cp1 = validate_checkpoint(sbi, cp_start_blk_no, &cp1_version); | |
530 | ||
531 | /* The second checkpoint pack should start at the next segment */ | |
f9a4e6df JK |
532 | cp_start_blk_no += ((unsigned long long)1) << |
533 | le32_to_cpu(fsb->log_blocks_per_seg); | |
127e670a JK |
534 | cp2 = validate_checkpoint(sbi, cp_start_blk_no, &cp2_version); |
535 | ||
536 | if (cp1 && cp2) { | |
537 | if (ver_after(cp2_version, cp1_version)) | |
538 | cur_page = cp2; | |
539 | else | |
540 | cur_page = cp1; | |
541 | } else if (cp1) { | |
542 | cur_page = cp1; | |
543 | } else if (cp2) { | |
544 | cur_page = cp2; | |
545 | } else { | |
546 | goto fail_no_cp; | |
547 | } | |
548 | ||
549 | cp_block = (struct f2fs_checkpoint *)page_address(cur_page); | |
550 | memcpy(sbi->ckpt, cp_block, blk_size); | |
551 | ||
1dbe4152 CL |
552 | if (cp_blks <= 1) |
553 | goto done; | |
554 | ||
555 | cp_blk_no = le32_to_cpu(fsb->cp_blkaddr); | |
556 | if (cur_page == cp2) | |
557 | cp_blk_no += 1 << le32_to_cpu(fsb->log_blocks_per_seg); | |
558 | ||
559 | for (i = 1; i < cp_blks; i++) { | |
560 | void *sit_bitmap_ptr; | |
561 | unsigned char *ckpt = (unsigned char *)sbi->ckpt; | |
562 | ||
563 | cur_page = get_meta_page(sbi, cp_blk_no + i); | |
564 | sit_bitmap_ptr = page_address(cur_page); | |
565 | memcpy(ckpt + i * blk_size, sit_bitmap_ptr, blk_size); | |
566 | f2fs_put_page(cur_page, 1); | |
567 | } | |
568 | done: | |
127e670a JK |
569 | f2fs_put_page(cp1, 1); |
570 | f2fs_put_page(cp2, 1); | |
571 | return 0; | |
572 | ||
573 | fail_no_cp: | |
574 | kfree(sbi->ckpt); | |
575 | return -EINVAL; | |
576 | } | |
577 | ||
5deb8267 | 578 | static int __add_dirty_inode(struct inode *inode, struct dir_inode_entry *new) |
127e670a JK |
579 | { |
580 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
127e670a | 581 | |
ed57c27f JK |
582 | if (is_inode_flag_set(F2FS_I(inode), FI_DIRTY_DIR)) |
583 | return -EEXIST; | |
2d7b822a | 584 | |
ed57c27f JK |
585 | set_inode_flag(F2FS_I(inode), FI_DIRTY_DIR); |
586 | F2FS_I(inode)->dirty_dir = new; | |
587 | list_add_tail(&new->list, &sbi->dir_inode_list); | |
dcdfff65 | 588 | stat_inc_dirty_dir(sbi); |
5deb8267 JK |
589 | return 0; |
590 | } | |
591 | ||
592 | void set_dirty_dir_page(struct inode *inode, struct page *page) | |
593 | { | |
594 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
595 | struct dir_inode_entry *new; | |
cf0ee0f0 | 596 | int ret = 0; |
5deb8267 | 597 | |
127e670a JK |
598 | if (!S_ISDIR(inode->i_mode)) |
599 | return; | |
7bd59381 GZ |
600 | |
601 | new = f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS); | |
127e670a JK |
602 | new->inode = inode; |
603 | INIT_LIST_HEAD(&new->list); | |
604 | ||
605 | spin_lock(&sbi->dir_inode_lock); | |
cf0ee0f0 | 606 | ret = __add_dirty_inode(inode, new); |
127e670a JK |
607 | inode_inc_dirty_dents(inode); |
608 | SetPagePrivate(page); | |
5deb8267 | 609 | spin_unlock(&sbi->dir_inode_lock); |
cf0ee0f0 CY |
610 | |
611 | if (ret) | |
612 | kmem_cache_free(inode_entry_slab, new); | |
5deb8267 JK |
613 | } |
614 | ||
615 | void add_dirty_dir_inode(struct inode *inode) | |
616 | { | |
617 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
7bd59381 GZ |
618 | struct dir_inode_entry *new = |
619 | f2fs_kmem_cache_alloc(inode_entry_slab, GFP_NOFS); | |
cf0ee0f0 | 620 | int ret = 0; |
7bd59381 | 621 | |
5deb8267 JK |
622 | new->inode = inode; |
623 | INIT_LIST_HEAD(&new->list); | |
127e670a | 624 | |
5deb8267 | 625 | spin_lock(&sbi->dir_inode_lock); |
cf0ee0f0 | 626 | ret = __add_dirty_inode(inode, new); |
127e670a | 627 | spin_unlock(&sbi->dir_inode_lock); |
cf0ee0f0 CY |
628 | |
629 | if (ret) | |
630 | kmem_cache_free(inode_entry_slab, new); | |
127e670a JK |
631 | } |
632 | ||
633 | void remove_dirty_dir_inode(struct inode *inode) | |
634 | { | |
635 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
2d7b822a | 636 | struct dir_inode_entry *entry; |
127e670a JK |
637 | |
638 | if (!S_ISDIR(inode->i_mode)) | |
639 | return; | |
640 | ||
641 | spin_lock(&sbi->dir_inode_lock); | |
ed57c27f JK |
642 | if (get_dirty_dents(inode) || |
643 | !is_inode_flag_set(F2FS_I(inode), FI_DIRTY_DIR)) { | |
3b10b1fd JK |
644 | spin_unlock(&sbi->dir_inode_lock); |
645 | return; | |
646 | } | |
127e670a | 647 | |
ed57c27f JK |
648 | entry = F2FS_I(inode)->dirty_dir; |
649 | list_del(&entry->list); | |
650 | F2FS_I(inode)->dirty_dir = NULL; | |
651 | clear_inode_flag(F2FS_I(inode), FI_DIRTY_DIR); | |
652 | stat_dec_dirty_dir(sbi); | |
127e670a | 653 | spin_unlock(&sbi->dir_inode_lock); |
ed57c27f | 654 | kmem_cache_free(inode_entry_slab, entry); |
74d0b917 JK |
655 | |
656 | /* Only from the recovery routine */ | |
afc3eda2 JK |
657 | if (is_inode_flag_set(F2FS_I(inode), FI_DELAY_IPUT)) { |
658 | clear_inode_flag(F2FS_I(inode), FI_DELAY_IPUT); | |
74d0b917 | 659 | iput(inode); |
afc3eda2 | 660 | } |
74d0b917 JK |
661 | } |
662 | ||
127e670a JK |
663 | void sync_dirty_dir_inodes(struct f2fs_sb_info *sbi) |
664 | { | |
ce3b7d80 | 665 | struct list_head *head; |
127e670a JK |
666 | struct dir_inode_entry *entry; |
667 | struct inode *inode; | |
668 | retry: | |
669 | spin_lock(&sbi->dir_inode_lock); | |
ce3b7d80 GZ |
670 | |
671 | head = &sbi->dir_inode_list; | |
127e670a JK |
672 | if (list_empty(head)) { |
673 | spin_unlock(&sbi->dir_inode_lock); | |
674 | return; | |
675 | } | |
676 | entry = list_entry(head->next, struct dir_inode_entry, list); | |
677 | inode = igrab(entry->inode); | |
678 | spin_unlock(&sbi->dir_inode_lock); | |
679 | if (inode) { | |
87d6f890 | 680 | filemap_fdatawrite(inode->i_mapping); |
127e670a JK |
681 | iput(inode); |
682 | } else { | |
683 | /* | |
684 | * We should submit bio, since it exists several | |
685 | * wribacking dentry pages in the freeing inode. | |
686 | */ | |
458e6197 | 687 | f2fs_submit_merged_bio(sbi, DATA, WRITE); |
127e670a JK |
688 | } |
689 | goto retry; | |
690 | } | |
691 | ||
0a8165d7 | 692 | /* |
127e670a JK |
693 | * Freeze all the FS-operations for checkpoint. |
694 | */ | |
43727527 | 695 | static void block_operations(struct f2fs_sb_info *sbi) |
127e670a | 696 | { |
127e670a JK |
697 | struct writeback_control wbc = { |
698 | .sync_mode = WB_SYNC_ALL, | |
699 | .nr_to_write = LONG_MAX, | |
700 | .for_reclaim = 0, | |
701 | }; | |
c718379b JK |
702 | struct blk_plug plug; |
703 | ||
704 | blk_start_plug(&plug); | |
705 | ||
39936837 | 706 | retry_flush_dents: |
e479556b | 707 | f2fs_lock_all(sbi); |
127e670a | 708 | /* write all the dirty dentry pages */ |
127e670a | 709 | if (get_pages(sbi, F2FS_DIRTY_DENTS)) { |
e479556b | 710 | f2fs_unlock_all(sbi); |
39936837 JK |
711 | sync_dirty_dir_inodes(sbi); |
712 | goto retry_flush_dents; | |
127e670a JK |
713 | } |
714 | ||
127e670a JK |
715 | /* |
716 | * POR: we should ensure that there is no dirty node pages | |
717 | * until finishing nat/sit flush. | |
718 | */ | |
39936837 JK |
719 | retry_flush_nodes: |
720 | mutex_lock(&sbi->node_write); | |
127e670a JK |
721 | |
722 | if (get_pages(sbi, F2FS_DIRTY_NODES)) { | |
39936837 JK |
723 | mutex_unlock(&sbi->node_write); |
724 | sync_node_pages(sbi, 0, &wbc); | |
725 | goto retry_flush_nodes; | |
127e670a | 726 | } |
c718379b | 727 | blk_finish_plug(&plug); |
127e670a JK |
728 | } |
729 | ||
730 | static void unblock_operations(struct f2fs_sb_info *sbi) | |
731 | { | |
39936837 | 732 | mutex_unlock(&sbi->node_write); |
e479556b | 733 | f2fs_unlock_all(sbi); |
127e670a JK |
734 | } |
735 | ||
fb51b5ef CL |
736 | static void wait_on_all_pages_writeback(struct f2fs_sb_info *sbi) |
737 | { | |
738 | DEFINE_WAIT(wait); | |
739 | ||
740 | for (;;) { | |
741 | prepare_to_wait(&sbi->cp_wait, &wait, TASK_UNINTERRUPTIBLE); | |
742 | ||
743 | if (!get_pages(sbi, F2FS_WRITEBACK)) | |
744 | break; | |
745 | ||
746 | io_schedule(); | |
747 | } | |
748 | finish_wait(&sbi->cp_wait, &wait); | |
749 | } | |
750 | ||
127e670a JK |
751 | static void do_checkpoint(struct f2fs_sb_info *sbi, bool is_umount) |
752 | { | |
753 | struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi); | |
754 | nid_t last_nid = 0; | |
755 | block_t start_blk; | |
756 | struct page *cp_page; | |
757 | unsigned int data_sum_blocks, orphan_blocks; | |
7e586fa0 | 758 | __u32 crc32 = 0; |
127e670a | 759 | void *kaddr; |
127e670a | 760 | int i; |
1dbe4152 | 761 | int cp_payload_blks = le32_to_cpu(F2FS_RAW_SUPER(sbi)->cp_payload); |
127e670a | 762 | |
1e87a78d JK |
763 | /* |
764 | * This avoids to conduct wrong roll-forward operations and uses | |
765 | * metapages, so should be called prior to sync_meta_pages below. | |
766 | */ | |
767 | discard_next_dnode(sbi); | |
768 | ||
127e670a JK |
769 | /* Flush all the NAT/SIT pages */ |
770 | while (get_pages(sbi, F2FS_DIRTY_META)) | |
771 | sync_meta_pages(sbi, META, LONG_MAX); | |
772 | ||
773 | next_free_nid(sbi, &last_nid); | |
774 | ||
775 | /* | |
776 | * modify checkpoint | |
777 | * version number is already updated | |
778 | */ | |
779 | ckpt->elapsed_time = cpu_to_le64(get_mtime(sbi)); | |
780 | ckpt->valid_block_count = cpu_to_le64(valid_user_blocks(sbi)); | |
781 | ckpt->free_segment_count = cpu_to_le32(free_segments(sbi)); | |
782 | for (i = 0; i < 3; i++) { | |
783 | ckpt->cur_node_segno[i] = | |
784 | cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_NODE)); | |
785 | ckpt->cur_node_blkoff[i] = | |
786 | cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_NODE)); | |
787 | ckpt->alloc_type[i + CURSEG_HOT_NODE] = | |
788 | curseg_alloc_type(sbi, i + CURSEG_HOT_NODE); | |
789 | } | |
790 | for (i = 0; i < 3; i++) { | |
791 | ckpt->cur_data_segno[i] = | |
792 | cpu_to_le32(curseg_segno(sbi, i + CURSEG_HOT_DATA)); | |
793 | ckpt->cur_data_blkoff[i] = | |
794 | cpu_to_le16(curseg_blkoff(sbi, i + CURSEG_HOT_DATA)); | |
795 | ckpt->alloc_type[i + CURSEG_HOT_DATA] = | |
796 | curseg_alloc_type(sbi, i + CURSEG_HOT_DATA); | |
797 | } | |
798 | ||
799 | ckpt->valid_node_count = cpu_to_le32(valid_node_count(sbi)); | |
800 | ckpt->valid_inode_count = cpu_to_le32(valid_inode_count(sbi)); | |
801 | ckpt->next_free_nid = cpu_to_le32(last_nid); | |
802 | ||
803 | /* 2 cp + n data seg summary + orphan inode blocks */ | |
804 | data_sum_blocks = npages_for_summary_flush(sbi); | |
805 | if (data_sum_blocks < 3) | |
25ca923b | 806 | set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG); |
127e670a | 807 | else |
25ca923b | 808 | clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG); |
127e670a JK |
809 | |
810 | orphan_blocks = (sbi->n_orphans + F2FS_ORPHANS_PER_BLOCK - 1) | |
811 | / F2FS_ORPHANS_PER_BLOCK; | |
1dbe4152 CL |
812 | ckpt->cp_pack_start_sum = cpu_to_le32(1 + cp_payload_blks + |
813 | orphan_blocks); | |
127e670a JK |
814 | |
815 | if (is_umount) { | |
25ca923b JK |
816 | set_ckpt_flags(ckpt, CP_UMOUNT_FLAG); |
817 | ckpt->cp_pack_total_block_count = cpu_to_le32(2 + | |
1dbe4152 CL |
818 | cp_payload_blks + data_sum_blocks + |
819 | orphan_blocks + NR_CURSEG_NODE_TYPE); | |
127e670a | 820 | } else { |
25ca923b JK |
821 | clear_ckpt_flags(ckpt, CP_UMOUNT_FLAG); |
822 | ckpt->cp_pack_total_block_count = cpu_to_le32(2 + | |
1dbe4152 CL |
823 | cp_payload_blks + data_sum_blocks + |
824 | orphan_blocks); | |
127e670a JK |
825 | } |
826 | ||
827 | if (sbi->n_orphans) | |
25ca923b | 828 | set_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG); |
127e670a | 829 | else |
25ca923b | 830 | clear_ckpt_flags(ckpt, CP_ORPHAN_PRESENT_FLAG); |
127e670a JK |
831 | |
832 | /* update SIT/NAT bitmap */ | |
833 | get_sit_bitmap(sbi, __bitmap_ptr(sbi, SIT_BITMAP)); | |
834 | get_nat_bitmap(sbi, __bitmap_ptr(sbi, NAT_BITMAP)); | |
835 | ||
836 | crc32 = f2fs_crc32(ckpt, le32_to_cpu(ckpt->checksum_offset)); | |
7e586fa0 JK |
837 | *((__le32 *)((unsigned char *)ckpt + |
838 | le32_to_cpu(ckpt->checksum_offset))) | |
127e670a JK |
839 | = cpu_to_le32(crc32); |
840 | ||
841 | start_blk = __start_cp_addr(sbi); | |
842 | ||
843 | /* write out checkpoint buffer at block 0 */ | |
844 | cp_page = grab_meta_page(sbi, start_blk++); | |
845 | kaddr = page_address(cp_page); | |
846 | memcpy(kaddr, ckpt, (1 << sbi->log_blocksize)); | |
847 | set_page_dirty(cp_page); | |
848 | f2fs_put_page(cp_page, 1); | |
849 | ||
1dbe4152 CL |
850 | for (i = 1; i < 1 + cp_payload_blks; i++) { |
851 | cp_page = grab_meta_page(sbi, start_blk++); | |
852 | kaddr = page_address(cp_page); | |
853 | memcpy(kaddr, (char *)ckpt + i * F2FS_BLKSIZE, | |
854 | (1 << sbi->log_blocksize)); | |
855 | set_page_dirty(cp_page); | |
856 | f2fs_put_page(cp_page, 1); | |
857 | } | |
858 | ||
127e670a JK |
859 | if (sbi->n_orphans) { |
860 | write_orphan_inodes(sbi, start_blk); | |
861 | start_blk += orphan_blocks; | |
862 | } | |
863 | ||
864 | write_data_summaries(sbi, start_blk); | |
865 | start_blk += data_sum_blocks; | |
866 | if (is_umount) { | |
867 | write_node_summaries(sbi, start_blk); | |
868 | start_blk += NR_CURSEG_NODE_TYPE; | |
869 | } | |
870 | ||
871 | /* writeout checkpoint block */ | |
872 | cp_page = grab_meta_page(sbi, start_blk); | |
873 | kaddr = page_address(cp_page); | |
874 | memcpy(kaddr, ckpt, (1 << sbi->log_blocksize)); | |
875 | set_page_dirty(cp_page); | |
876 | f2fs_put_page(cp_page, 1); | |
877 | ||
878 | /* wait for previous submitted node/meta pages writeback */ | |
fb51b5ef | 879 | wait_on_all_pages_writeback(sbi); |
127e670a | 880 | |
4ef51a8f | 881 | filemap_fdatawait_range(NODE_MAPPING(sbi), 0, LONG_MAX); |
9df27d98 | 882 | filemap_fdatawait_range(META_MAPPING(sbi), 0, LONG_MAX); |
127e670a JK |
883 | |
884 | /* update user_block_counts */ | |
885 | sbi->last_valid_block_count = sbi->total_valid_block_count; | |
886 | sbi->alloc_valid_block_count = 0; | |
887 | ||
888 | /* Here, we only have one bio having CP pack */ | |
577e3495 | 889 | sync_meta_pages(sbi, META_FLUSH, LONG_MAX); |
127e670a | 890 | |
6bacf52f | 891 | if (unlikely(!is_set_ckpt_flags(ckpt, CP_ERROR_FLAG))) { |
577e3495 JK |
892 | clear_prefree_segments(sbi); |
893 | F2FS_RESET_SB_DIRT(sbi); | |
894 | } | |
127e670a JK |
895 | } |
896 | ||
0a8165d7 | 897 | /* |
127e670a JK |
898 | * We guarantee that this checkpoint procedure should not fail. |
899 | */ | |
43727527 | 900 | void write_checkpoint(struct f2fs_sb_info *sbi, bool is_umount) |
127e670a JK |
901 | { |
902 | struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi); | |
903 | unsigned long long ckpt_ver; | |
904 | ||
2af4bd6c NJ |
905 | trace_f2fs_write_checkpoint(sbi->sb, is_umount, "start block_ops"); |
906 | ||
43727527 JK |
907 | mutex_lock(&sbi->cp_mutex); |
908 | block_operations(sbi); | |
127e670a | 909 | |
2af4bd6c NJ |
910 | trace_f2fs_write_checkpoint(sbi->sb, is_umount, "finish block_ops"); |
911 | ||
458e6197 JK |
912 | f2fs_submit_merged_bio(sbi, DATA, WRITE); |
913 | f2fs_submit_merged_bio(sbi, NODE, WRITE); | |
914 | f2fs_submit_merged_bio(sbi, META, WRITE); | |
127e670a JK |
915 | |
916 | /* | |
917 | * update checkpoint pack index | |
918 | * Increase the version number so that | |
919 | * SIT entries and seg summaries are written at correct place | |
920 | */ | |
d71b5564 | 921 | ckpt_ver = cur_cp_version(ckpt); |
127e670a JK |
922 | ckpt->checkpoint_ver = cpu_to_le64(++ckpt_ver); |
923 | ||
924 | /* write cached NAT/SIT entries to NAT/SIT area */ | |
925 | flush_nat_entries(sbi); | |
926 | flush_sit_entries(sbi); | |
927 | ||
127e670a JK |
928 | /* unlock all the fs_lock[] in do_checkpoint() */ |
929 | do_checkpoint(sbi, is_umount); | |
930 | ||
931 | unblock_operations(sbi); | |
932 | mutex_unlock(&sbi->cp_mutex); | |
2af4bd6c | 933 | |
942e0be6 | 934 | stat_inc_cp_count(sbi->stat_info); |
2af4bd6c | 935 | trace_f2fs_write_checkpoint(sbi->sb, is_umount, "finish checkpoint"); |
127e670a JK |
936 | } |
937 | ||
938 | void init_orphan_info(struct f2fs_sb_info *sbi) | |
939 | { | |
17b692f6 | 940 | spin_lock_init(&sbi->orphan_inode_lock); |
127e670a JK |
941 | INIT_LIST_HEAD(&sbi->orphan_inode_list); |
942 | sbi->n_orphans = 0; | |
0d47c1ad GZ |
943 | /* |
944 | * considering 512 blocks in a segment 8 blocks are needed for cp | |
945 | * and log segment summaries. Remaining blocks are used to keep | |
946 | * orphan entries with the limitation one reserved segment | |
947 | * for cp pack we can have max 1020*504 orphan entries | |
948 | */ | |
949 | sbi->max_orphans = (sbi->blocks_per_seg - 2 - NR_CURSEG_TYPE) | |
950 | * F2FS_ORPHANS_PER_BLOCK; | |
127e670a JK |
951 | } |
952 | ||
6e6093a8 | 953 | int __init create_checkpoint_caches(void) |
127e670a JK |
954 | { |
955 | orphan_entry_slab = f2fs_kmem_cache_create("f2fs_orphan_entry", | |
e8512d2e | 956 | sizeof(struct orphan_inode_entry)); |
6bacf52f | 957 | if (!orphan_entry_slab) |
127e670a JK |
958 | return -ENOMEM; |
959 | inode_entry_slab = f2fs_kmem_cache_create("f2fs_dirty_dir_entry", | |
e8512d2e | 960 | sizeof(struct dir_inode_entry)); |
6bacf52f | 961 | if (!inode_entry_slab) { |
127e670a JK |
962 | kmem_cache_destroy(orphan_entry_slab); |
963 | return -ENOMEM; | |
964 | } | |
965 | return 0; | |
966 | } | |
967 | ||
968 | void destroy_checkpoint_caches(void) | |
969 | { | |
970 | kmem_cache_destroy(orphan_entry_slab); | |
971 | kmem_cache_destroy(inode_entry_slab); | |
972 | } |