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x86/intel_rdt: Fix incorrect returned value when creating rdgroup sub-directory in...
[cris-mirror.git] / fs / f2fs / recovery.c
blob337f3363f48f6c2946a91c9877f38328a9406002
1 /*
2 * fs/f2fs/recovery.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 "f2fs.h"
14 #include "node.h"
15 #include "segment.h"
16
17 /*
18 * Roll forward recovery scenarios.
19 *
20 * [Term] F: fsync_mark, D: dentry_mark
21 *
22 * 1. inode(x) | CP | inode(x) | dnode(F)
23 * -> Update the latest inode(x).
24 *
25 * 2. inode(x) | CP | inode(F) | dnode(F)
26 * -> No problem.
27 *
28 * 3. inode(x) | CP | dnode(F) | inode(x)
29 * -> Recover to the latest dnode(F), and drop the last inode(x)
30 *
31 * 4. inode(x) | CP | dnode(F) | inode(F)
32 * -> No problem.
33 *
34 * 5. CP | inode(x) | dnode(F)
35 * -> The inode(DF) was missing. Should drop this dnode(F).
36 *
37 * 6. CP | inode(DF) | dnode(F)
38 * -> No problem.
39 *
40 * 7. CP | dnode(F) | inode(DF)
41 * -> If f2fs_iget fails, then goto next to find inode(DF).
42 *
43 * 8. CP | dnode(F) | inode(x)
44 * -> If f2fs_iget fails, then goto next to find inode(DF).
45 * But it will fail due to no inode(DF).
46 */
47
48 static struct kmem_cache *fsync_entry_slab;
49
50 bool space_for_roll_forward(struct f2fs_sb_info *sbi)
51 {
52 s64 nalloc = percpu_counter_sum_positive(&sbi->alloc_valid_block_count);
53
54 if (sbi->last_valid_block_count + nalloc > sbi->user_block_count)
55 return false;
56 return true;
57 }
58
59 static struct fsync_inode_entry *get_fsync_inode(struct list_head *head,
60 nid_t ino)
61 {
62 struct fsync_inode_entry *entry;
63
64 list_for_each_entry(entry, head, list)
65 if (entry->inode->i_ino == ino)
66 return entry;
67
68 return NULL;
69 }
70
71 static struct fsync_inode_entry *add_fsync_inode(struct f2fs_sb_info *sbi,
72 struct list_head *head, nid_t ino, bool quota_inode)
73 {
74 struct inode *inode;
75 struct fsync_inode_entry *entry;
76 int err;
77
78 inode = f2fs_iget_retry(sbi->sb, ino);
79 if (IS_ERR(inode))
80 return ERR_CAST(inode);
81
82 err = dquot_initialize(inode);
83 if (err)
84 goto err_out;
85
86 if (quota_inode) {
87 err = dquot_alloc_inode(inode);
88 if (err)
89 goto err_out;
90 }
91
92 entry = f2fs_kmem_cache_alloc(fsync_entry_slab, GFP_F2FS_ZERO);
93 entry->inode = inode;
94 list_add_tail(&entry->list, head);
95
96 return entry;
97 err_out:
98 iput(inode);
99 return ERR_PTR(err);
100 }
101
102 static void del_fsync_inode(struct fsync_inode_entry *entry)
103 {
104 iput(entry->inode);
105 list_del(&entry->list);
106 kmem_cache_free(fsync_entry_slab, entry);
107 }
108
109 static int recover_dentry(struct inode *inode, struct page *ipage,
110 struct list_head *dir_list)
111 {
112 struct f2fs_inode *raw_inode = F2FS_INODE(ipage);
113 nid_t pino = le32_to_cpu(raw_inode->i_pino);
114 struct f2fs_dir_entry *de;
115 struct fscrypt_name fname;
116 struct page *page;
117 struct inode *dir, *einode;
118 struct fsync_inode_entry *entry;
119 int err = 0;
120 char *name;
121
122 entry = get_fsync_inode(dir_list, pino);
123 if (!entry) {
124 entry = add_fsync_inode(F2FS_I_SB(inode), dir_list,
125 pino, false);
126 if (IS_ERR(entry)) {
127 dir = ERR_CAST(entry);
128 err = PTR_ERR(entry);
129 goto out;
130 }
131 }
132
133 dir = entry->inode;
134
135 memset(&fname, 0, sizeof(struct fscrypt_name));
136 fname.disk_name.len = le32_to_cpu(raw_inode->i_namelen);
137 fname.disk_name.name = raw_inode->i_name;
138
139 if (unlikely(fname.disk_name.len > F2FS_NAME_LEN)) {
140 WARN_ON(1);
141 err = -ENAMETOOLONG;
142 goto out;
143 }
144 retry:
145 de = __f2fs_find_entry(dir, &fname, &page);
146 if (de && inode->i_ino == le32_to_cpu(de->ino))
147 goto out_unmap_put;
148
149 if (de) {
150 einode = f2fs_iget_retry(inode->i_sb, le32_to_cpu(de->ino));
151 if (IS_ERR(einode)) {
152 WARN_ON(1);
153 err = PTR_ERR(einode);
154 if (err == -ENOENT)
155 err = -EEXIST;
156 goto out_unmap_put;
157 }
158
159 err = dquot_initialize(einode);
160 if (err) {
161 iput(einode);
162 goto out_unmap_put;
163 }
164
165 err = acquire_orphan_inode(F2FS_I_SB(inode));
166 if (err) {
167 iput(einode);
168 goto out_unmap_put;
169 }
170 f2fs_delete_entry(de, page, dir, einode);
171 iput(einode);
172 goto retry;
173 } else if (IS_ERR(page)) {
174 err = PTR_ERR(page);
175 } else {
176 err = __f2fs_do_add_link(dir, &fname, inode,
177 inode->i_ino, inode->i_mode);
178 }
179 if (err == -ENOMEM)
180 goto retry;
181 goto out;
182
183 out_unmap_put:
184 f2fs_dentry_kunmap(dir, page);
185 f2fs_put_page(page, 0);
186 out:
187 if (file_enc_name(inode))
188 name = "<encrypted>";
189 else
190 name = raw_inode->i_name;
191 f2fs_msg(inode->i_sb, KERN_NOTICE,
192 "%s: ino = %x, name = %s, dir = %lx, err = %d",
193 __func__, ino_of_node(ipage), name,
194 IS_ERR(dir) ? 0 : dir->i_ino, err);
195 return err;
196 }
197
198 static void recover_inline_flags(struct inode *inode, struct f2fs_inode *ri)
199 {
200 if (ri->i_inline & F2FS_PIN_FILE)
201 set_inode_flag(inode, FI_PIN_FILE);
202 else
203 clear_inode_flag(inode, FI_PIN_FILE);
204 if (ri->i_inline & F2FS_DATA_EXIST)
205 set_inode_flag(inode, FI_DATA_EXIST);
206 else
207 clear_inode_flag(inode, FI_DATA_EXIST);
208 if (!(ri->i_inline & F2FS_INLINE_DOTS))
209 clear_inode_flag(inode, FI_INLINE_DOTS);
210 }
211
212 static void recover_inode(struct inode *inode, struct page *page)
213 {
214 struct f2fs_inode *raw = F2FS_INODE(page);
215 char *name;
216
217 inode->i_mode = le16_to_cpu(raw->i_mode);
218 f2fs_i_size_write(inode, le64_to_cpu(raw->i_size));
219 inode->i_atime.tv_sec = le64_to_cpu(raw->i_atime);
220 inode->i_ctime.tv_sec = le64_to_cpu(raw->i_ctime);
221 inode->i_mtime.tv_sec = le64_to_cpu(raw->i_mtime);
222 inode->i_atime.tv_nsec = le32_to_cpu(raw->i_atime_nsec);
223 inode->i_ctime.tv_nsec = le32_to_cpu(raw->i_ctime_nsec);
224 inode->i_mtime.tv_nsec = le32_to_cpu(raw->i_mtime_nsec);
225
226 F2FS_I(inode)->i_advise = raw->i_advise;
227
228 recover_inline_flags(inode, raw);
229
230 if (file_enc_name(inode))
231 name = "<encrypted>";
232 else
233 name = F2FS_INODE(page)->i_name;
234
235 f2fs_msg(inode->i_sb, KERN_NOTICE,
236 "recover_inode: ino = %x, name = %s, inline = %x",
237 ino_of_node(page), name, raw->i_inline);
238 }
239
240 static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head,
241 bool check_only)
242 {
243 struct curseg_info *curseg;
244 struct page *page = NULL;
245 block_t blkaddr;
246 int err = 0;
247
248 /* get node pages in the current segment */
249 curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
250 blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
251
252 while (1) {
253 struct fsync_inode_entry *entry;
254
255 if (!is_valid_blkaddr(sbi, blkaddr, META_POR))
256 return 0;
257
258 page = get_tmp_page(sbi, blkaddr);
259
260 if (!is_recoverable_dnode(page))
261 break;
262
263 if (!is_fsync_dnode(page))
264 goto next;
265
266 entry = get_fsync_inode(head, ino_of_node(page));
267 if (!entry) {
268 bool quota_inode = false;
269
270 if (!check_only &&
271 IS_INODE(page) && is_dent_dnode(page)) {
272 err = recover_inode_page(sbi, page);
273 if (err)
274 break;
275 quota_inode = true;
276 }
277
278 /*
279 * CP | dnode(F) | inode(DF)
280 * For this case, we should not give up now.
281 */
282 entry = add_fsync_inode(sbi, head, ino_of_node(page),
283 quota_inode);
284 if (IS_ERR(entry)) {
285 err = PTR_ERR(entry);
286 if (err == -ENOENT) {
287 err = 0;
288 goto next;
289 }
290 break;
291 }
292 }
293 entry->blkaddr = blkaddr;
294
295 if (IS_INODE(page) && is_dent_dnode(page))
296 entry->last_dentry = blkaddr;
297 next:
298 /* check next segment */
299 blkaddr = next_blkaddr_of_node(page);
300 f2fs_put_page(page, 1);
301
302 ra_meta_pages_cond(sbi, blkaddr);
303 }
304 f2fs_put_page(page, 1);
305 return err;
306 }
307
308 static void destroy_fsync_dnodes(struct list_head *head)
309 {
310 struct fsync_inode_entry *entry, *tmp;
311
312 list_for_each_entry_safe(entry, tmp, head, list)
313 del_fsync_inode(entry);
314 }
315
316 static int check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
317 block_t blkaddr, struct dnode_of_data *dn)
318 {
319 struct seg_entry *sentry;
320 unsigned int segno = GET_SEGNO(sbi, blkaddr);
321 unsigned short blkoff = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
322 struct f2fs_summary_block *sum_node;
323 struct f2fs_summary sum;
324 struct page *sum_page, *node_page;
325 struct dnode_of_data tdn = *dn;
326 nid_t ino, nid;
327 struct inode *inode;
328 unsigned int offset;
329 block_t bidx;
330 int i;
331
332 sentry = get_seg_entry(sbi, segno);
333 if (!f2fs_test_bit(blkoff, sentry->cur_valid_map))
334 return 0;
335
336 /* Get the previous summary */
337 for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
338 struct curseg_info *curseg = CURSEG_I(sbi, i);
339 if (curseg->segno == segno) {
340 sum = curseg->sum_blk->entries[blkoff];
341 goto got_it;
342 }
343 }
344
345 sum_page = get_sum_page(sbi, segno);
346 sum_node = (struct f2fs_summary_block *)page_address(sum_page);
347 sum = sum_node->entries[blkoff];
348 f2fs_put_page(sum_page, 1);
349 got_it:
350 /* Use the locked dnode page and inode */
351 nid = le32_to_cpu(sum.nid);
352 if (dn->inode->i_ino == nid) {
353 tdn.nid = nid;
354 if (!dn->inode_page_locked)
355 lock_page(dn->inode_page);
356 tdn.node_page = dn->inode_page;
357 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
358 goto truncate_out;
359 } else if (dn->nid == nid) {
360 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
361 goto truncate_out;
362 }
363
364 /* Get the node page */
365 node_page = get_node_page(sbi, nid);
366 if (IS_ERR(node_page))
367 return PTR_ERR(node_page);
368
369 offset = ofs_of_node(node_page);
370 ino = ino_of_node(node_page);
371 f2fs_put_page(node_page, 1);
372
373 if (ino != dn->inode->i_ino) {
374 int ret;
375
376 /* Deallocate previous index in the node page */
377 inode = f2fs_iget_retry(sbi->sb, ino);
378 if (IS_ERR(inode))
379 return PTR_ERR(inode);
380
381 ret = dquot_initialize(inode);
382 if (ret) {
383 iput(inode);
384 return ret;
385 }
386 } else {
387 inode = dn->inode;
388 }
389
390 bidx = start_bidx_of_node(offset, inode) + le16_to_cpu(sum.ofs_in_node);
391
392 /*
393 * if inode page is locked, unlock temporarily, but its reference
394 * count keeps alive.
395 */
396 if (ino == dn->inode->i_ino && dn->inode_page_locked)
397 unlock_page(dn->inode_page);
398
399 set_new_dnode(&tdn, inode, NULL, NULL, 0);
400 if (get_dnode_of_data(&tdn, bidx, LOOKUP_NODE))
401 goto out;
402
403 if (tdn.data_blkaddr == blkaddr)
404 truncate_data_blocks_range(&tdn, 1);
405
406 f2fs_put_dnode(&tdn);
407 out:
408 if (ino != dn->inode->i_ino)
409 iput(inode);
410 else if (dn->inode_page_locked)
411 lock_page(dn->inode_page);
412 return 0;
413
414 truncate_out:
415 if (datablock_addr(tdn.inode, tdn.node_page,
416 tdn.ofs_in_node) == blkaddr)
417 truncate_data_blocks_range(&tdn, 1);
418 if (dn->inode->i_ino == nid && !dn->inode_page_locked)
419 unlock_page(dn->inode_page);
420 return 0;
421 }
422
423 static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
424 struct page *page)
425 {
426 struct dnode_of_data dn;
427 struct node_info ni;
428 unsigned int start, end;
429 int err = 0, recovered = 0;
430
431 /* step 1: recover xattr */
432 if (IS_INODE(page)) {
433 recover_inline_xattr(inode, page);
434 } else if (f2fs_has_xattr_block(ofs_of_node(page))) {
435 err = recover_xattr_data(inode, page);
436 if (!err)
437 recovered++;
438 goto out;
439 }
440
441 /* step 2: recover inline data */
442 if (recover_inline_data(inode, page))
443 goto out;
444
445 /* step 3: recover data indices */
446 start = start_bidx_of_node(ofs_of_node(page), inode);
447 end = start + ADDRS_PER_PAGE(page, inode);
448
449 set_new_dnode(&dn, inode, NULL, NULL, 0);
450 retry_dn:
451 err = get_dnode_of_data(&dn, start, ALLOC_NODE);
452 if (err) {
453 if (err == -ENOMEM) {
454 congestion_wait(BLK_RW_ASYNC, HZ/50);
455 goto retry_dn;
456 }
457 goto out;
458 }
459
460 f2fs_wait_on_page_writeback(dn.node_page, NODE, true);
461
462 get_node_info(sbi, dn.nid, &ni);
463 f2fs_bug_on(sbi, ni.ino != ino_of_node(page));
464 f2fs_bug_on(sbi, ofs_of_node(dn.node_page) != ofs_of_node(page));
465
466 for (; start < end; start++, dn.ofs_in_node++) {
467 block_t src, dest;
468
469 src = datablock_addr(dn.inode, dn.node_page, dn.ofs_in_node);
470 dest = datablock_addr(dn.inode, page, dn.ofs_in_node);
471
472 /* skip recovering if dest is the same as src */
473 if (src == dest)
474 continue;
475
476 /* dest is invalid, just invalidate src block */
477 if (dest == NULL_ADDR) {
478 truncate_data_blocks_range(&dn, 1);
479 continue;
480 }
481
482 if (!file_keep_isize(inode) &&
483 (i_size_read(inode) <= ((loff_t)start << PAGE_SHIFT)))
484 f2fs_i_size_write(inode,
485 (loff_t)(start + 1) << PAGE_SHIFT);
486
487 /*
488 * dest is reserved block, invalidate src block
489 * and then reserve one new block in dnode page.
490 */
491 if (dest == NEW_ADDR) {
492 truncate_data_blocks_range(&dn, 1);
493 reserve_new_block(&dn);
494 continue;
495 }
496
497 /* dest is valid block, try to recover from src to dest */
498 if (is_valid_blkaddr(sbi, dest, META_POR)) {
499
500 if (src == NULL_ADDR) {
501 err = reserve_new_block(&dn);
502 #ifdef CONFIG_F2FS_FAULT_INJECTION
503 while (err)
504 err = reserve_new_block(&dn);
505 #endif
506 /* We should not get -ENOSPC */
507 f2fs_bug_on(sbi, err);
508 if (err)
509 goto err;
510 }
511 retry_prev:
512 /* Check the previous node page having this index */
513 err = check_index_in_prev_nodes(sbi, dest, &dn);
514 if (err) {
515 if (err == -ENOMEM) {
516 congestion_wait(BLK_RW_ASYNC, HZ/50);
517 goto retry_prev;
518 }
519 goto err;
520 }
521
522 /* write dummy data page */
523 f2fs_replace_block(sbi, &dn, src, dest,
524 ni.version, false, false);
525 recovered++;
526 }
527 }
528
529 copy_node_footer(dn.node_page, page);
530 fill_node_footer(dn.node_page, dn.nid, ni.ino,
531 ofs_of_node(page), false);
532 set_page_dirty(dn.node_page);
533 err:
534 f2fs_put_dnode(&dn);
535 out:
536 f2fs_msg(sbi->sb, KERN_NOTICE,
537 "recover_data: ino = %lx (i_size: %s) recovered = %d, err = %d",
538 inode->i_ino,
539 file_keep_isize(inode) ? "keep" : "recover",
540 recovered, err);
541 return err;
542 }
543
544 static int recover_data(struct f2fs_sb_info *sbi, struct list_head *inode_list,
545 struct list_head *dir_list)
546 {
547 struct curseg_info *curseg;
548 struct page *page = NULL;
549 int err = 0;
550 block_t blkaddr;
551
552 /* get node pages in the current segment */
553 curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
554 blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
555
556 while (1) {
557 struct fsync_inode_entry *entry;
558
559 if (!is_valid_blkaddr(sbi, blkaddr, META_POR))
560 break;
561
562 ra_meta_pages_cond(sbi, blkaddr);
563
564 page = get_tmp_page(sbi, blkaddr);
565
566 if (!is_recoverable_dnode(page)) {
567 f2fs_put_page(page, 1);
568 break;
569 }
570
571 entry = get_fsync_inode(inode_list, ino_of_node(page));
572 if (!entry)
573 goto next;
574 /*
575 * inode(x) | CP | inode(x) | dnode(F)
576 * In this case, we can lose the latest inode(x).
577 * So, call recover_inode for the inode update.
578 */
579 if (IS_INODE(page))
580 recover_inode(entry->inode, page);
581 if (entry->last_dentry == blkaddr) {
582 err = recover_dentry(entry->inode, page, dir_list);
583 if (err) {
584 f2fs_put_page(page, 1);
585 break;
586 }
587 }
588 err = do_recover_data(sbi, entry->inode, page);
589 if (err) {
590 f2fs_put_page(page, 1);
591 break;
592 }
593
594 if (entry->blkaddr == blkaddr)
595 del_fsync_inode(entry);
596 next:
597 /* check next segment */
598 blkaddr = next_blkaddr_of_node(page);
599 f2fs_put_page(page, 1);
600 }
601 if (!err)
602 allocate_new_segments(sbi);
603 return err;
604 }
605
606 int recover_fsync_data(struct f2fs_sb_info *sbi, bool check_only)
607 {
608 struct list_head inode_list;
609 struct list_head dir_list;
610 int err;
611 int ret = 0;
612 unsigned long s_flags = sbi->sb->s_flags;
613 bool need_writecp = false;
614 #ifdef CONFIG_QUOTA
615 int quota_enabled;
616 #endif
617
618 if (s_flags & SB_RDONLY) {
619 f2fs_msg(sbi->sb, KERN_INFO, "orphan cleanup on readonly fs");
620 sbi->sb->s_flags &= ~SB_RDONLY;
621 }
622
623 #ifdef CONFIG_QUOTA
624 /* Needed for iput() to work correctly and not trash data */
625 sbi->sb->s_flags |= SB_ACTIVE;
626 /* Turn on quotas so that they are updated correctly */
627 quota_enabled = f2fs_enable_quota_files(sbi, s_flags & SB_RDONLY);
628 #endif
629
630 fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
631 sizeof(struct fsync_inode_entry));
632 if (!fsync_entry_slab) {
633 err = -ENOMEM;
634 goto out;
635 }
636
637 INIT_LIST_HEAD(&inode_list);
638 INIT_LIST_HEAD(&dir_list);
639
640 /* prevent checkpoint */
641 mutex_lock(&sbi->cp_mutex);
642
643 /* step #1: find fsynced inode numbers */
644 err = find_fsync_dnodes(sbi, &inode_list, check_only);
645 if (err || list_empty(&inode_list))
646 goto skip;
647
648 if (check_only) {
649 ret = 1;
650 goto skip;
651 }
652
653 need_writecp = true;
654
655 /* step #2: recover data */
656 err = recover_data(sbi, &inode_list, &dir_list);
657 if (!err)
658 f2fs_bug_on(sbi, !list_empty(&inode_list));
659 skip:
660 destroy_fsync_dnodes(&inode_list);
661
662 /* truncate meta pages to be used by the recovery */
663 truncate_inode_pages_range(META_MAPPING(sbi),
664 (loff_t)MAIN_BLKADDR(sbi) << PAGE_SHIFT, -1);
665
666 if (err) {
667 truncate_inode_pages_final(NODE_MAPPING(sbi));
668 truncate_inode_pages_final(META_MAPPING(sbi));
669 }
670
671 clear_sbi_flag(sbi, SBI_POR_DOING);
672 mutex_unlock(&sbi->cp_mutex);
673
674 /* let's drop all the directory inodes for clean checkpoint */
675 destroy_fsync_dnodes(&dir_list);
676
677 if (!err && need_writecp) {
678 struct cp_control cpc = {
679 .reason = CP_RECOVERY,
680 };
681 err = write_checkpoint(sbi, &cpc);
682 }
683
684 kmem_cache_destroy(fsync_entry_slab);
685 out:
686 #ifdef CONFIG_QUOTA
687 /* Turn quotas off */
688 if (quota_enabled)
689 f2fs_quota_off_umount(sbi->sb);
690 #endif
691 sbi->sb->s_flags = s_flags; /* Restore SB_RDONLY status */
692
693 return ret ? ret: err;
694 }
CRIS linux kernel tree