1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * fs/f2fs/recovery.c
4 *
5 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
6 * http://www.samsung.com/
7 */
8 #include <asm/unaligned.h>
9 #include <linux/fs.h>
10 #include <linux/f2fs_fs.h>
11 #include "f2fs.h"
12 #include "node.h"
13 #include "segment.h"
14
15 /*
16 * Roll forward recovery scenarios.
17 *
18 * [Term] F: fsync_mark, D: dentry_mark
19 *
20 * 1. inode(x) | CP | inode(x) | dnode(F)
21 * -> Update the latest inode(x).
22 *
23 * 2. inode(x) | CP | inode(F) | dnode(F)
24 * -> No problem.
25 *
26 * 3. inode(x) | CP | dnode(F) | inode(x)
27 * -> Recover to the latest dnode(F), and drop the last inode(x)
28 *
29 * 4. inode(x) | CP | dnode(F) | inode(F)
30 * -> No problem.
31 *
32 * 5. CP | inode(x) | dnode(F)
33 * -> The inode(DF) was missing. Should drop this dnode(F).
34 *
35 * 6. CP | inode(DF) | dnode(F)
36 * -> No problem.
37 *
38 * 7. CP | dnode(F) | inode(DF)
39 * -> If f2fs_iget fails, then goto next to find inode(DF).
40 *
41 * 8. CP | dnode(F) | inode(x)
42 * -> If f2fs_iget fails, then goto next to find inode(DF).
43 * But it will fail due to no inode(DF).
44 */
45
46 static struct kmem_cache *fsync_entry_slab;
47
f2fs_space_for_roll_forward(struct f2fs_sb_info * sbi)48 bool f2fs_space_for_roll_forward(struct f2fs_sb_info *sbi)
49 {
50 s64 nalloc = percpu_counter_sum_positive(&sbi->alloc_valid_block_count);
51
52 if (sbi->last_valid_block_count + nalloc > sbi->user_block_count)
53 return false;
54 return true;
55 }
56
get_fsync_inode(struct list_head * head,nid_t ino)57 static struct fsync_inode_entry *get_fsync_inode(struct list_head *head,
58 nid_t ino)
59 {
60 struct fsync_inode_entry *entry;
61
62 list_for_each_entry(entry, head, list)
63 if (entry->inode->i_ino == ino)
64 return entry;
65
66 return NULL;
67 }
68
add_fsync_inode(struct f2fs_sb_info * sbi,struct list_head * head,nid_t ino,bool quota_inode)69 static struct fsync_inode_entry *add_fsync_inode(struct f2fs_sb_info *sbi,
70 struct list_head *head, nid_t ino, bool quota_inode)
71 {
72 struct inode *inode;
73 struct fsync_inode_entry *entry;
74 int err;
75
76 inode = f2fs_iget_retry(sbi->sb, ino);
77 if (IS_ERR(inode))
78 return ERR_CAST(inode);
79
80 err = dquot_initialize(inode);
81 if (err)
82 goto err_out;
83
84 if (quota_inode) {
85 err = dquot_alloc_inode(inode);
86 if (err)
87 goto err_out;
88 }
89
90 entry = f2fs_kmem_cache_alloc(fsync_entry_slab, GFP_F2FS_ZERO);
91 entry->inode = inode;
92 list_add_tail(&entry->list, head);
93
94 return entry;
95 err_out:
96 iput(inode);
97 return ERR_PTR(err);
98 }
99
del_fsync_inode(struct fsync_inode_entry * entry,int drop)100 static void del_fsync_inode(struct fsync_inode_entry *entry, int drop)
101 {
102 if (drop) {
103 /* inode should not be recovered, drop it */
104 f2fs_inode_synced(entry->inode);
105 }
106 iput(entry->inode);
107 list_del(&entry->list);
108 kmem_cache_free(fsync_entry_slab, entry);
109 }
110
init_recovered_filename(const struct inode * dir,struct f2fs_inode * raw_inode,struct f2fs_filename * fname,struct qstr * usr_fname)111 static int init_recovered_filename(const struct inode *dir,
112 struct f2fs_inode *raw_inode,
113 struct f2fs_filename *fname,
114 struct qstr *usr_fname)
115 {
116 int err;
117
118 memset(fname, 0, sizeof(*fname));
119 fname->disk_name.len = le32_to_cpu(raw_inode->i_namelen);
120 fname->disk_name.name = raw_inode->i_name;
121
122 if (WARN_ON(fname->disk_name.len > F2FS_NAME_LEN))
123 return -ENAMETOOLONG;
124
125 if (!IS_ENCRYPTED(dir)) {
126 usr_fname->name = fname->disk_name.name;
127 usr_fname->len = fname->disk_name.len;
128 fname->usr_fname = usr_fname;
129 }
130
131 /* Compute the hash of the filename */
132 if (IS_ENCRYPTED(dir) && IS_CASEFOLDED(dir)) {
133 /*
134 * In this case the hash isn't computable without the key, so it
135 * was saved on-disk.
136 */
137 if (fname->disk_name.len + sizeof(f2fs_hash_t) > F2FS_NAME_LEN)
138 return -EINVAL;
139 fname->hash = get_unaligned((f2fs_hash_t *)
140 &raw_inode->i_name[fname->disk_name.len]);
141 } else if (IS_CASEFOLDED(dir)) {
142 err = f2fs_init_casefolded_name(dir, fname);
143 if (err)
144 return err;
145 f2fs_hash_filename(dir, fname);
146 #ifdef CONFIG_UNICODE
147 /* Case-sensitive match is fine for recovery */
148 kfree(fname->cf_name.name);
149 fname->cf_name.name = NULL;
150 #endif
151 } else {
152 f2fs_hash_filename(dir, fname);
153 }
154 return 0;
155 }
156
recover_dentry(struct inode * inode,struct page * ipage,struct list_head * dir_list)157 static int recover_dentry(struct inode *inode, struct page *ipage,
158 struct list_head *dir_list)
159 {
160 struct f2fs_inode *raw_inode = F2FS_INODE(ipage);
161 nid_t pino = le32_to_cpu(raw_inode->i_pino);
162 struct f2fs_dir_entry *de;
163 struct f2fs_filename fname;
164 struct qstr usr_fname;
165 struct page *page;
166 struct inode *dir, *einode;
167 struct fsync_inode_entry *entry;
168 int err = 0;
169 char *name;
170
171 entry = get_fsync_inode(dir_list, pino);
172 if (!entry) {
173 entry = add_fsync_inode(F2FS_I_SB(inode), dir_list,
174 pino, false);
175 if (IS_ERR(entry)) {
176 dir = ERR_CAST(entry);
177 err = PTR_ERR(entry);
178 goto out;
179 }
180 }
181
182 dir = entry->inode;
183 err = init_recovered_filename(dir, raw_inode, &fname, &usr_fname);
184 if (err)
185 goto out;
186 retry:
187 de = __f2fs_find_entry(dir, &fname, &page);
188 if (de && inode->i_ino == le32_to_cpu(de->ino))
189 goto out_put;
190
191 if (de) {
192 einode = f2fs_iget_retry(inode->i_sb, le32_to_cpu(de->ino));
193 if (IS_ERR(einode)) {
194 WARN_ON(1);
195 err = PTR_ERR(einode);
196 if (err == -ENOENT)
197 err = -EEXIST;
198 goto out_put;
199 }
200
201 err = dquot_initialize(einode);
202 if (err) {
203 iput(einode);
204 goto out_put;
205 }
206
207 err = f2fs_acquire_orphan_inode(F2FS_I_SB(inode));
208 if (err) {
209 iput(einode);
210 goto out_put;
211 }
212 f2fs_delete_entry(de, page, dir, einode);
213 iput(einode);
214 goto retry;
215 } else if (IS_ERR(page)) {
216 err = PTR_ERR(page);
217 } else {
218 err = f2fs_add_dentry(dir, &fname, inode,
219 inode->i_ino, inode->i_mode);
220 }
221 if (err == -ENOMEM)
222 goto retry;
223 goto out;
224
225 out_put:
226 f2fs_put_page(page, 0);
227 out:
228 if (file_enc_name(inode))
229 name = "<encrypted>";
230 else
231 name = raw_inode->i_name;
232 f2fs_notice(F2FS_I_SB(inode), "%s: ino = %x, name = %s, dir = %lx, err = %d",
233 __func__, ino_of_node(ipage), name,
234 IS_ERR(dir) ? 0 : dir->i_ino, err);
235 return err;
236 }
237
recover_quota_data(struct inode * inode,struct page * page)238 static int recover_quota_data(struct inode *inode, struct page *page)
239 {
240 struct f2fs_inode *raw = F2FS_INODE(page);
241 struct iattr attr;
242 uid_t i_uid = le32_to_cpu(raw->i_uid);
243 gid_t i_gid = le32_to_cpu(raw->i_gid);
244 int err;
245
246 memset(&attr, 0, sizeof(attr));
247
248 attr.ia_uid = make_kuid(inode->i_sb->s_user_ns, i_uid);
249 attr.ia_gid = make_kgid(inode->i_sb->s_user_ns, i_gid);
250
251 if (!uid_eq(attr.ia_uid, inode->i_uid))
252 attr.ia_valid |= ATTR_UID;
253 if (!gid_eq(attr.ia_gid, inode->i_gid))
254 attr.ia_valid |= ATTR_GID;
255
256 if (!attr.ia_valid)
257 return 0;
258
259 err = dquot_transfer(inode, &attr);
260 if (err)
261 set_sbi_flag(F2FS_I_SB(inode), SBI_QUOTA_NEED_REPAIR);
262 return err;
263 }
264
recover_inline_flags(struct inode * inode,struct f2fs_inode * ri)265 static void recover_inline_flags(struct inode *inode, struct f2fs_inode *ri)
266 {
267 if (ri->i_inline & F2FS_PIN_FILE)
268 set_inode_flag(inode, FI_PIN_FILE);
269 else
270 clear_inode_flag(inode, FI_PIN_FILE);
271 if (ri->i_inline & F2FS_DATA_EXIST)
272 set_inode_flag(inode, FI_DATA_EXIST);
273 else
274 clear_inode_flag(inode, FI_DATA_EXIST);
275 }
276
recover_inode(struct inode * inode,struct page * page)277 static int recover_inode(struct inode *inode, struct page *page)
278 {
279 struct f2fs_inode *raw = F2FS_INODE(page);
280 char *name;
281 int err;
282
283 inode->i_mode = le16_to_cpu(raw->i_mode);
284
285 err = recover_quota_data(inode, page);
286 if (err)
287 return err;
288
289 i_uid_write(inode, le32_to_cpu(raw->i_uid));
290 i_gid_write(inode, le32_to_cpu(raw->i_gid));
291
292 if (raw->i_inline & F2FS_EXTRA_ATTR) {
293 if (f2fs_sb_has_project_quota(F2FS_I_SB(inode)) &&
294 F2FS_FITS_IN_INODE(raw, le16_to_cpu(raw->i_extra_isize),
295 i_projid)) {
296 projid_t i_projid;
297 kprojid_t kprojid;
298
299 i_projid = (projid_t)le32_to_cpu(raw->i_projid);
300 kprojid = make_kprojid(&init_user_ns, i_projid);
301
302 if (!projid_eq(kprojid, F2FS_I(inode)->i_projid)) {
303 err = f2fs_transfer_project_quota(inode,
304 kprojid);
305 if (err)
306 return err;
307 F2FS_I(inode)->i_projid = kprojid;
308 }
309 }
310 }
311
312 f2fs_i_size_write(inode, le64_to_cpu(raw->i_size));
313 inode->i_atime.tv_sec = le64_to_cpu(raw->i_atime);
314 inode->i_ctime.tv_sec = le64_to_cpu(raw->i_ctime);
315 inode->i_mtime.tv_sec = le64_to_cpu(raw->i_mtime);
316 inode->i_atime.tv_nsec = le32_to_cpu(raw->i_atime_nsec);
317 inode->i_ctime.tv_nsec = le32_to_cpu(raw->i_ctime_nsec);
318 inode->i_mtime.tv_nsec = le32_to_cpu(raw->i_mtime_nsec);
319
320 F2FS_I(inode)->i_advise = raw->i_advise;
321 F2FS_I(inode)->i_flags = le32_to_cpu(raw->i_flags);
322 f2fs_set_inode_flags(inode);
323 F2FS_I(inode)->i_gc_failures[GC_FAILURE_PIN] =
324 le16_to_cpu(raw->i_gc_failures);
325
326 recover_inline_flags(inode, raw);
327
328 f2fs_mark_inode_dirty_sync(inode, true);
329
330 if (file_enc_name(inode))
331 name = "<encrypted>";
332 else
333 name = F2FS_INODE(page)->i_name;
334
335 f2fs_notice(F2FS_I_SB(inode), "recover_inode: ino = %x, name = %s, inline = %x",
336 ino_of_node(page), name, raw->i_inline);
337 return 0;
338 }
339
find_fsync_dnodes(struct f2fs_sb_info * sbi,struct list_head * head,bool check_only)340 static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head,
341 bool check_only)
342 {
343 struct curseg_info *curseg;
344 struct page *page = NULL;
345 block_t blkaddr;
346 unsigned int loop_cnt = 0;
347 unsigned int free_blocks = MAIN_SEGS(sbi) * sbi->blocks_per_seg -
348 valid_user_blocks(sbi);
349 int err = 0;
350
351 /* get node pages in the current segment */
352 curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
353 blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
354
355 while (1) {
356 struct fsync_inode_entry *entry;
357
358 if (!f2fs_is_valid_blkaddr(sbi, blkaddr, META_POR))
359 return 0;
360
361 page = f2fs_get_tmp_page(sbi, blkaddr);
362 if (IS_ERR(page)) {
363 err = PTR_ERR(page);
364 break;
365 }
366
367 if (!is_recoverable_dnode(page)) {
368 f2fs_put_page(page, 1);
369 break;
370 }
371
372 if (!is_fsync_dnode(page))
373 goto next;
374
375 entry = get_fsync_inode(head, ino_of_node(page));
376 if (!entry) {
377 bool quota_inode = false;
378
379 if (!check_only &&
380 IS_INODE(page) && is_dent_dnode(page)) {
381 err = f2fs_recover_inode_page(sbi, page);
382 if (err) {
383 f2fs_put_page(page, 1);
384 break;
385 }
386 quota_inode = true;
387 }
388
389 /*
390 * CP | dnode(F) | inode(DF)
391 * For this case, we should not give up now.
392 */
393 entry = add_fsync_inode(sbi, head, ino_of_node(page),
394 quota_inode);
395 if (IS_ERR(entry)) {
396 err = PTR_ERR(entry);
397 if (err == -ENOENT) {
398 err = 0;
399 goto next;
400 }
401 f2fs_put_page(page, 1);
402 break;
403 }
404 }
405 entry->blkaddr = blkaddr;
406
407 if (IS_INODE(page) && is_dent_dnode(page))
408 entry->last_dentry = blkaddr;
409 next:
410 /* sanity check in order to detect looped node chain */
411 if (++loop_cnt >= free_blocks ||
412 blkaddr == next_blkaddr_of_node(page)) {
413 f2fs_notice(sbi, "%s: detect looped node chain, blkaddr:%u, next:%u",
414 __func__, blkaddr,
415 next_blkaddr_of_node(page));
416 f2fs_put_page(page, 1);
417 err = -EINVAL;
418 break;
419 }
420
421 /* check next segment */
422 blkaddr = next_blkaddr_of_node(page);
423 f2fs_put_page(page, 1);
424
425 f2fs_ra_meta_pages_cond(sbi, blkaddr);
426 }
427 return err;
428 }
429
destroy_fsync_dnodes(struct list_head * head,int drop)430 static void destroy_fsync_dnodes(struct list_head *head, int drop)
431 {
432 struct fsync_inode_entry *entry, *tmp;
433
434 list_for_each_entry_safe(entry, tmp, head, list)
435 del_fsync_inode(entry, drop);
436 }
437
check_index_in_prev_nodes(struct f2fs_sb_info * sbi,block_t blkaddr,struct dnode_of_data * dn)438 static int check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
439 block_t blkaddr, struct dnode_of_data *dn)
440 {
441 struct seg_entry *sentry;
442 unsigned int segno = GET_SEGNO(sbi, blkaddr);
443 unsigned short blkoff = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
444 struct f2fs_summary_block *sum_node;
445 struct f2fs_summary sum;
446 struct page *sum_page, *node_page;
447 struct dnode_of_data tdn = *dn;
448 nid_t ino, nid;
449 struct inode *inode;
450 unsigned int offset, ofs_in_node, max_addrs;
451 block_t bidx;
452 int i;
453
454 sentry = get_seg_entry(sbi, segno);
455 if (!f2fs_test_bit(blkoff, sentry->cur_valid_map))
456 return 0;
457
458 /* Get the previous summary */
459 for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
460 struct curseg_info *curseg = CURSEG_I(sbi, i);
461 if (curseg->segno == segno) {
462 sum = curseg->sum_blk->entries[blkoff];
463 goto got_it;
464 }
465 }
466
467 sum_page = f2fs_get_sum_page(sbi, segno);
468 if (IS_ERR(sum_page))
469 return PTR_ERR(sum_page);
470 sum_node = (struct f2fs_summary_block *)page_address(sum_page);
471 sum = sum_node->entries[blkoff];
472 f2fs_put_page(sum_page, 1);
473 got_it:
474 /* Use the locked dnode page and inode */
475 nid = le32_to_cpu(sum.nid);
476 ofs_in_node = le16_to_cpu(sum.ofs_in_node);
477
478 max_addrs = ADDRS_PER_PAGE(dn->node_page, dn->inode);
479 if (ofs_in_node >= max_addrs) {
480 f2fs_err(sbi, "Inconsistent ofs_in_node:%u in summary, ino:%lu, nid:%u, max:%u",
481 ofs_in_node, dn->inode->i_ino, nid, max_addrs);
482 return -EFSCORRUPTED;
483 }
484
485 if (dn->inode->i_ino == nid) {
486 tdn.nid = nid;
487 if (!dn->inode_page_locked)
488 lock_page(dn->inode_page);
489 tdn.node_page = dn->inode_page;
490 tdn.ofs_in_node = ofs_in_node;
491 goto truncate_out;
492 } else if (dn->nid == nid) {
493 tdn.ofs_in_node = ofs_in_node;
494 goto truncate_out;
495 }
496
497 /* Get the node page */
498 node_page = f2fs_get_node_page(sbi, nid);
499 if (IS_ERR(node_page))
500 return PTR_ERR(node_page);
501
502 offset = ofs_of_node(node_page);
503 ino = ino_of_node(node_page);
504 f2fs_put_page(node_page, 1);
505
506 if (ino != dn->inode->i_ino) {
507 int ret;
508
509 /* Deallocate previous index in the node page */
510 inode = f2fs_iget_retry(sbi->sb, ino);
511 if (IS_ERR(inode))
512 return PTR_ERR(inode);
513
514 ret = dquot_initialize(inode);
515 if (ret) {
516 iput(inode);
517 return ret;
518 }
519 } else {
520 inode = dn->inode;
521 }
522
523 bidx = f2fs_start_bidx_of_node(offset, inode) +
524 le16_to_cpu(sum.ofs_in_node);
525
526 /*
527 * if inode page is locked, unlock temporarily, but its reference
528 * count keeps alive.
529 */
530 if (ino == dn->inode->i_ino && dn->inode_page_locked)
531 unlock_page(dn->inode_page);
532
533 set_new_dnode(&tdn, inode, NULL, NULL, 0);
534 if (f2fs_get_dnode_of_data(&tdn, bidx, LOOKUP_NODE))
535 goto out;
536
537 if (tdn.data_blkaddr == blkaddr)
538 f2fs_truncate_data_blocks_range(&tdn, 1);
539
540 f2fs_put_dnode(&tdn);
541 out:
542 if (ino != dn->inode->i_ino)
543 iput(inode);
544 else if (dn->inode_page_locked)
545 lock_page(dn->inode_page);
546 return 0;
547
548 truncate_out:
549 if (f2fs_data_blkaddr(&tdn) == blkaddr)
550 f2fs_truncate_data_blocks_range(&tdn, 1);
551 if (dn->inode->i_ino == nid && !dn->inode_page_locked)
552 unlock_page(dn->inode_page);
553 return 0;
554 }
555
do_recover_data(struct f2fs_sb_info * sbi,struct inode * inode,struct page * page)556 static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
557 struct page *page)
558 {
559 struct dnode_of_data dn;
560 struct node_info ni;
561 unsigned int start, end;
562 int err = 0, recovered = 0;
563
564 /* step 1: recover xattr */
565 if (IS_INODE(page)) {
566 err = f2fs_recover_inline_xattr(inode, page);
567 if (err)
568 goto out;
569 } else if (f2fs_has_xattr_block(ofs_of_node(page))) {
570 err = f2fs_recover_xattr_data(inode, page);
571 if (!err)
572 recovered++;
573 goto out;
574 }
575
576 /* step 2: recover inline data */
577 err = f2fs_recover_inline_data(inode, page);
578 if (err) {
579 if (err == 1)
580 err = 0;
581 goto out;
582 }
583
584 /* step 3: recover data indices */
585 start = f2fs_start_bidx_of_node(ofs_of_node(page), inode);
586 end = start + ADDRS_PER_PAGE(page, inode);
587
588 set_new_dnode(&dn, inode, NULL, NULL, 0);
589 retry_dn:
590 err = f2fs_get_dnode_of_data(&dn, start, ALLOC_NODE);
591 if (err) {
592 if (err == -ENOMEM) {
593 congestion_wait(BLK_RW_ASYNC, DEFAULT_IO_TIMEOUT);
594 goto retry_dn;
595 }
596 goto out;
597 }
598
599 f2fs_wait_on_page_writeback(dn.node_page, NODE, true, true);
600
601 err = f2fs_get_node_info(sbi, dn.nid, &ni);
602 if (err)
603 goto err;
604
605 f2fs_bug_on(sbi, ni.ino != ino_of_node(page));
606
607 if (ofs_of_node(dn.node_page) != ofs_of_node(page)) {
608 f2fs_warn(sbi, "Inconsistent ofs_of_node, ino:%lu, ofs:%u, %u",
609 inode->i_ino, ofs_of_node(dn.node_page),
610 ofs_of_node(page));
611 err = -EFSCORRUPTED;
612 goto err;
613 }
614
615 for (; start < end; start++, dn.ofs_in_node++) {
616 block_t src, dest;
617
618 src = f2fs_data_blkaddr(&dn);
619 dest = data_blkaddr(dn.inode, page, dn.ofs_in_node);
620
621 if (__is_valid_data_blkaddr(src) &&
622 !f2fs_is_valid_blkaddr(sbi, src, META_POR)) {
623 err = -EFSCORRUPTED;
624 goto err;
625 }
626
627 if (__is_valid_data_blkaddr(dest) &&
628 !f2fs_is_valid_blkaddr(sbi, dest, META_POR)) {
629 err = -EFSCORRUPTED;
630 goto err;
631 }
632
633 /* skip recovering if dest is the same as src */
634 if (src == dest)
635 continue;
636
637 /* dest is invalid, just invalidate src block */
638 if (dest == NULL_ADDR) {
639 f2fs_truncate_data_blocks_range(&dn, 1);
640 continue;
641 }
642
643 if (!file_keep_isize(inode) &&
644 (i_size_read(inode) <= ((loff_t)start << PAGE_SHIFT)))
645 f2fs_i_size_write(inode,
646 (loff_t)(start + 1) << PAGE_SHIFT);
647
648 /*
649 * dest is reserved block, invalidate src block
650 * and then reserve one new block in dnode page.
651 */
652 if (dest == NEW_ADDR) {
653 f2fs_truncate_data_blocks_range(&dn, 1);
654 do {
655 err = f2fs_reserve_new_block(&dn);
656 if (err == -ENOSPC) {
657 f2fs_bug_on(sbi, 1);
658 break;
659 }
660 } while (err &&
661 IS_ENABLED(CONFIG_F2FS_FAULT_INJECTION));
662 if (err)
663 goto err;
664 continue;
665 }
666
667 /* dest is valid block, try to recover from src to dest */
668 if (f2fs_is_valid_blkaddr(sbi, dest, META_POR)) {
669
670 if (src == NULL_ADDR) {
671 do {
672 err = f2fs_reserve_new_block(&dn);
673 if (err == -ENOSPC) {
674 f2fs_bug_on(sbi, 1);
675 break;
676 }
677 } while (err &&
678 IS_ENABLED(CONFIG_F2FS_FAULT_INJECTION));
679 if (err)
680 goto err;
681 }
682 retry_prev:
683 /* Check the previous node page having this index */
684 err = check_index_in_prev_nodes(sbi, dest, &dn);
685 if (err) {
686 if (err == -ENOMEM) {
687 congestion_wait(BLK_RW_ASYNC,
688 DEFAULT_IO_TIMEOUT);
689 goto retry_prev;
690 }
691 goto err;
692 }
693
694 if (f2fs_is_valid_blkaddr(sbi, dest,
695 DATA_GENERIC_ENHANCE_UPDATE)) {
696 f2fs_err(sbi, "Inconsistent dest blkaddr:%u, ino:%lu, ofs:%u",
697 dest, inode->i_ino, dn.ofs_in_node);
698 err = -EFSCORRUPTED;
699 goto err;
700 }
701
702 /* write dummy data page */
703 f2fs_replace_block(sbi, &dn, src, dest,
704 ni.version, false, false);
705 recovered++;
706 }
707 }
708
709 copy_node_footer(dn.node_page, page);
710 fill_node_footer(dn.node_page, dn.nid, ni.ino,
711 ofs_of_node(page), false);
712 set_page_dirty(dn.node_page);
713 err:
714 f2fs_put_dnode(&dn);
715 out:
716 f2fs_notice(sbi, "recover_data: ino = %lx (i_size: %s) recovered = %d, err = %d",
717 inode->i_ino, file_keep_isize(inode) ? "keep" : "recover",
718 recovered, err);
719 return err;
720 }
721
recover_data(struct f2fs_sb_info * sbi,struct list_head * inode_list,struct list_head * tmp_inode_list,struct list_head * dir_list)722 static int recover_data(struct f2fs_sb_info *sbi, struct list_head *inode_list,
723 struct list_head *tmp_inode_list, struct list_head *dir_list)
724 {
725 struct curseg_info *curseg;
726 struct page *page = NULL;
727 int err = 0;
728 block_t blkaddr;
729
730 /* get node pages in the current segment */
731 curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
732 blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
733
734 while (1) {
735 struct fsync_inode_entry *entry;
736
737 if (!f2fs_is_valid_blkaddr(sbi, blkaddr, META_POR))
738 break;
739
740 f2fs_ra_meta_pages_cond(sbi, blkaddr);
741
742 page = f2fs_get_tmp_page(sbi, blkaddr);
743 if (IS_ERR(page)) {
744 err = PTR_ERR(page);
745 break;
746 }
747
748 if (!is_recoverable_dnode(page)) {
749 f2fs_put_page(page, 1);
750 break;
751 }
752
753 entry = get_fsync_inode(inode_list, ino_of_node(page));
754 if (!entry)
755 goto next;
756 /*
757 * inode(x) | CP | inode(x) | dnode(F)
758 * In this case, we can lose the latest inode(x).
759 * So, call recover_inode for the inode update.
760 */
761 if (IS_INODE(page)) {
762 err = recover_inode(entry->inode, page);
763 if (err) {
764 f2fs_put_page(page, 1);
765 break;
766 }
767 }
768 if (entry->last_dentry == blkaddr) {
769 err = recover_dentry(entry->inode, page, dir_list);
770 if (err) {
771 f2fs_put_page(page, 1);
772 break;
773 }
774 }
775 err = do_recover_data(sbi, entry->inode, page);
776 if (err) {
777 f2fs_put_page(page, 1);
778 break;
779 }
780
781 if (entry->blkaddr == blkaddr)
782 list_move_tail(&entry->list, tmp_inode_list);
783 next:
784 /* check next segment */
785 blkaddr = next_blkaddr_of_node(page);
786 f2fs_put_page(page, 1);
787 }
788 if (!err)
789 f2fs_allocate_new_segments(sbi, NO_CHECK_TYPE);
790 return err;
791 }
792
f2fs_recover_fsync_data(struct f2fs_sb_info * sbi,bool check_only)793 int f2fs_recover_fsync_data(struct f2fs_sb_info *sbi, bool check_only)
794 {
795 struct list_head inode_list, tmp_inode_list;
796 struct list_head dir_list;
797 int err;
798 int ret = 0;
799 unsigned long s_flags = sbi->sb->s_flags;
800 bool need_writecp = false;
801 bool fix_curseg_write_pointer = false;
802 #ifdef CONFIG_QUOTA
803 int quota_enabled;
804 #endif
805
806 if (s_flags & SB_RDONLY) {
807 f2fs_info(sbi, "recover fsync data on readonly fs");
808 sbi->sb->s_flags &= ~SB_RDONLY;
809 }
810
811 #ifdef CONFIG_QUOTA
812 /* Needed for iput() to work correctly and not trash data */
813 sbi->sb->s_flags |= SB_ACTIVE;
814 /* Turn on quotas so that they are updated correctly */
815 quota_enabled = f2fs_enable_quota_files(sbi, s_flags & SB_RDONLY);
816 #endif
817
818 fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
819 sizeof(struct fsync_inode_entry));
820 if (!fsync_entry_slab) {
821 err = -ENOMEM;
822 goto out;
823 }
824
825 INIT_LIST_HEAD(&inode_list);
826 INIT_LIST_HEAD(&tmp_inode_list);
827 INIT_LIST_HEAD(&dir_list);
828
829 /* prevent checkpoint */
830 mutex_lock(&sbi->cp_mutex);
831
832 /* step #1: find fsynced inode numbers */
833 err = find_fsync_dnodes(sbi, &inode_list, check_only);
834 if (err || list_empty(&inode_list))
835 goto skip;
836
837 if (check_only) {
838 ret = 1;
839 goto skip;
840 }
841
842 need_writecp = true;
843
844 /* step #2: recover data */
845 err = recover_data(sbi, &inode_list, &tmp_inode_list, &dir_list);
846 if (!err)
847 f2fs_bug_on(sbi, !list_empty(&inode_list));
848 else {
849 /* restore s_flags to let iput() trash data */
850 sbi->sb->s_flags = s_flags;
851 }
852 skip:
853 fix_curseg_write_pointer = !check_only || list_empty(&inode_list);
854
855 destroy_fsync_dnodes(&inode_list, err);
856 destroy_fsync_dnodes(&tmp_inode_list, err);
857
858 /* truncate meta pages to be used by the recovery */
859 truncate_inode_pages_range(META_MAPPING(sbi),
860 (loff_t)MAIN_BLKADDR(sbi) << PAGE_SHIFT, -1);
861
862 if (err) {
863 truncate_inode_pages_final(NODE_MAPPING(sbi));
864 truncate_inode_pages_final(META_MAPPING(sbi));
865 }
866
867 /*
868 * If fsync data succeeds or there is no fsync data to recover,
869 * and the f2fs is not read only, check and fix zoned block devices'
870 * write pointer consistency.
871 */
872 if (!err && fix_curseg_write_pointer && !f2fs_readonly(sbi->sb) &&
873 f2fs_sb_has_blkzoned(sbi)) {
874 err = f2fs_fix_curseg_write_pointer(sbi);
875 ret = err;
876 }
877
878 if (!err)
879 clear_sbi_flag(sbi, SBI_POR_DOING);
880
881 mutex_unlock(&sbi->cp_mutex);
882
883 /* let's drop all the directory inodes for clean checkpoint */
884 destroy_fsync_dnodes(&dir_list, err);
885
886 if (need_writecp) {
887 set_sbi_flag(sbi, SBI_IS_RECOVERED);
888
889 if (!err) {
890 struct cp_control cpc = {
891 .reason = CP_RECOVERY,
892 };
893 err = f2fs_write_checkpoint(sbi, &cpc);
894 }
895 }
896
897 kmem_cache_destroy(fsync_entry_slab);
898 out:
899 #ifdef CONFIG_QUOTA
900 /* Turn quotas off */
901 if (quota_enabled)
902 f2fs_quota_off_umount(sbi->sb);
903 #endif
904 sbi->sb->s_flags = s_flags; /* Restore SB_RDONLY status */
905
906 return ret ? ret: err;
907 }
908