arm64: kgdb: Fix single-step exception handling oops
[linux/fpc-iii.git] / fs / f2fs / recovery.c
blobe87b7d7e80fc7557d78a57e6cb5374d8f6fb4e37
1 /*
2 * fs/f2fs/recovery.c
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
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.
11 #include <linux/fs.h>
12 #include <linux/f2fs_fs.h>
13 #include "f2fs.h"
14 #include "node.h"
15 #include "segment.h"
18 * Roll forward recovery scenarios.
20 * [Term] F: fsync_mark, D: dentry_mark
22 * 1. inode(x) | CP | inode(x) | dnode(F)
23 * -> Update the latest inode(x).
25 * 2. inode(x) | CP | inode(F) | dnode(F)
26 * -> No problem.
28 * 3. inode(x) | CP | dnode(F) | inode(x)
29 * -> Recover to the latest dnode(F), and drop the last inode(x)
31 * 4. inode(x) | CP | dnode(F) | inode(F)
32 * -> No problem.
34 * 5. CP | inode(x) | dnode(F)
35 * -> The inode(DF) was missing. Should drop this dnode(F).
37 * 6. CP | inode(DF) | dnode(F)
38 * -> No problem.
40 * 7. CP | dnode(F) | inode(DF)
41 * -> If f2fs_iget fails, then goto next to find inode(DF).
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).
48 static struct kmem_cache *fsync_entry_slab;
50 bool space_for_roll_forward(struct f2fs_sb_info *sbi)
52 s64 nalloc = percpu_counter_sum_positive(&sbi->alloc_valid_block_count);
54 if (sbi->last_valid_block_count + nalloc > sbi->user_block_count)
55 return false;
56 return true;
59 static struct fsync_inode_entry *get_fsync_inode(struct list_head *head,
60 nid_t ino)
62 struct fsync_inode_entry *entry;
64 list_for_each_entry(entry, head, list)
65 if (entry->inode->i_ino == ino)
66 return entry;
68 return NULL;
71 static struct fsync_inode_entry *add_fsync_inode(struct f2fs_sb_info *sbi,
72 struct list_head *head, nid_t ino)
74 struct inode *inode;
75 struct fsync_inode_entry *entry;
77 inode = f2fs_iget_retry(sbi->sb, ino);
78 if (IS_ERR(inode))
79 return ERR_CAST(inode);
81 entry = f2fs_kmem_cache_alloc(fsync_entry_slab, GFP_F2FS_ZERO);
82 entry->inode = inode;
83 list_add_tail(&entry->list, head);
85 return entry;
88 static void del_fsync_inode(struct fsync_inode_entry *entry)
90 iput(entry->inode);
91 list_del(&entry->list);
92 kmem_cache_free(fsync_entry_slab, entry);
95 static int recover_dentry(struct inode *inode, struct page *ipage,
96 struct list_head *dir_list)
98 struct f2fs_inode *raw_inode = F2FS_INODE(ipage);
99 nid_t pino = le32_to_cpu(raw_inode->i_pino);
100 struct f2fs_dir_entry *de;
101 struct fscrypt_name fname;
102 struct page *page;
103 struct inode *dir, *einode;
104 struct fsync_inode_entry *entry;
105 int err = 0;
106 char *name;
108 entry = get_fsync_inode(dir_list, pino);
109 if (!entry) {
110 entry = add_fsync_inode(F2FS_I_SB(inode), dir_list, pino);
111 if (IS_ERR(entry)) {
112 dir = ERR_CAST(entry);
113 err = PTR_ERR(entry);
114 goto out;
118 dir = entry->inode;
120 memset(&fname, 0, sizeof(struct fscrypt_name));
121 fname.disk_name.len = le32_to_cpu(raw_inode->i_namelen);
122 fname.disk_name.name = raw_inode->i_name;
124 if (unlikely(fname.disk_name.len > F2FS_NAME_LEN)) {
125 WARN_ON(1);
126 err = -ENAMETOOLONG;
127 goto out;
129 retry:
130 de = __f2fs_find_entry(dir, &fname, &page);
131 if (de && inode->i_ino == le32_to_cpu(de->ino))
132 goto out_unmap_put;
134 if (de) {
135 einode = f2fs_iget_retry(inode->i_sb, le32_to_cpu(de->ino));
136 if (IS_ERR(einode)) {
137 WARN_ON(1);
138 err = PTR_ERR(einode);
139 if (err == -ENOENT)
140 err = -EEXIST;
141 goto out_unmap_put;
143 err = acquire_orphan_inode(F2FS_I_SB(inode));
144 if (err) {
145 iput(einode);
146 goto out_unmap_put;
148 f2fs_delete_entry(de, page, dir, einode);
149 iput(einode);
150 goto retry;
151 } else if (IS_ERR(page)) {
152 err = PTR_ERR(page);
153 } else {
154 err = __f2fs_do_add_link(dir, &fname, inode,
155 inode->i_ino, inode->i_mode);
157 if (err == -ENOMEM)
158 goto retry;
159 goto out;
161 out_unmap_put:
162 f2fs_dentry_kunmap(dir, page);
163 f2fs_put_page(page, 0);
164 out:
165 if (file_enc_name(inode))
166 name = "<encrypted>";
167 else
168 name = raw_inode->i_name;
169 f2fs_msg(inode->i_sb, KERN_NOTICE,
170 "%s: ino = %x, name = %s, dir = %lx, err = %d",
171 __func__, ino_of_node(ipage), name,
172 IS_ERR(dir) ? 0 : dir->i_ino, err);
173 return err;
176 static void recover_inode(struct inode *inode, struct page *page)
178 struct f2fs_inode *raw = F2FS_INODE(page);
179 char *name;
181 inode->i_mode = le16_to_cpu(raw->i_mode);
182 i_uid_write(inode, le32_to_cpu(raw->i_uid));
183 i_gid_write(inode, le32_to_cpu(raw->i_gid));
184 f2fs_i_size_write(inode, le64_to_cpu(raw->i_size));
185 inode->i_atime.tv_sec = le64_to_cpu(raw->i_mtime);
186 inode->i_ctime.tv_sec = le64_to_cpu(raw->i_ctime);
187 inode->i_mtime.tv_sec = le64_to_cpu(raw->i_mtime);
188 inode->i_atime.tv_nsec = le32_to_cpu(raw->i_mtime_nsec);
189 inode->i_ctime.tv_nsec = le32_to_cpu(raw->i_ctime_nsec);
190 inode->i_mtime.tv_nsec = le32_to_cpu(raw->i_mtime_nsec);
192 if (file_enc_name(inode))
193 name = "<encrypted>";
194 else
195 name = F2FS_INODE(page)->i_name;
197 f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode: ino = %x, name = %s",
198 ino_of_node(page), name);
201 static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head)
203 struct curseg_info *curseg;
204 struct page *page = NULL;
205 block_t blkaddr;
206 int err = 0;
208 /* get node pages in the current segment */
209 curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
210 blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
212 while (1) {
213 struct fsync_inode_entry *entry;
215 if (!f2fs_is_valid_blkaddr(sbi, blkaddr, META_POR))
216 return 0;
218 page = get_tmp_page(sbi, blkaddr);
220 if (!is_recoverable_dnode(page))
221 break;
223 if (!is_fsync_dnode(page))
224 goto next;
226 entry = get_fsync_inode(head, ino_of_node(page));
227 if (!entry) {
228 if (IS_INODE(page) && is_dent_dnode(page)) {
229 err = recover_inode_page(sbi, page);
230 if (err)
231 break;
235 * CP | dnode(F) | inode(DF)
236 * For this case, we should not give up now.
238 entry = add_fsync_inode(sbi, head, ino_of_node(page));
239 if (IS_ERR(entry)) {
240 err = PTR_ERR(entry);
241 if (err == -ENOENT) {
242 err = 0;
243 goto next;
245 break;
248 entry->blkaddr = blkaddr;
250 if (IS_INODE(page) && is_dent_dnode(page))
251 entry->last_dentry = blkaddr;
252 next:
253 /* check next segment */
254 blkaddr = next_blkaddr_of_node(page);
255 f2fs_put_page(page, 1);
257 ra_meta_pages_cond(sbi, blkaddr);
259 f2fs_put_page(page, 1);
260 return err;
263 static void destroy_fsync_dnodes(struct list_head *head)
265 struct fsync_inode_entry *entry, *tmp;
267 list_for_each_entry_safe(entry, tmp, head, list)
268 del_fsync_inode(entry);
271 static int check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
272 block_t blkaddr, struct dnode_of_data *dn)
274 struct seg_entry *sentry;
275 unsigned int segno = GET_SEGNO(sbi, blkaddr);
276 unsigned short blkoff = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
277 struct f2fs_summary_block *sum_node;
278 struct f2fs_summary sum;
279 struct page *sum_page, *node_page;
280 struct dnode_of_data tdn = *dn;
281 nid_t ino, nid;
282 struct inode *inode;
283 unsigned int offset;
284 block_t bidx;
285 int i;
287 sentry = get_seg_entry(sbi, segno);
288 if (!f2fs_test_bit(blkoff, sentry->cur_valid_map))
289 return 0;
291 /* Get the previous summary */
292 for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
293 struct curseg_info *curseg = CURSEG_I(sbi, i);
294 if (curseg->segno == segno) {
295 sum = curseg->sum_blk->entries[blkoff];
296 goto got_it;
300 sum_page = get_sum_page(sbi, segno);
301 sum_node = (struct f2fs_summary_block *)page_address(sum_page);
302 sum = sum_node->entries[blkoff];
303 f2fs_put_page(sum_page, 1);
304 got_it:
305 /* Use the locked dnode page and inode */
306 nid = le32_to_cpu(sum.nid);
307 if (dn->inode->i_ino == nid) {
308 tdn.nid = nid;
309 if (!dn->inode_page_locked)
310 lock_page(dn->inode_page);
311 tdn.node_page = dn->inode_page;
312 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
313 goto truncate_out;
314 } else if (dn->nid == nid) {
315 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
316 goto truncate_out;
319 /* Get the node page */
320 node_page = get_node_page(sbi, nid);
321 if (IS_ERR(node_page))
322 return PTR_ERR(node_page);
324 offset = ofs_of_node(node_page);
325 ino = ino_of_node(node_page);
326 f2fs_put_page(node_page, 1);
328 if (ino != dn->inode->i_ino) {
329 /* Deallocate previous index in the node page */
330 inode = f2fs_iget_retry(sbi->sb, ino);
331 if (IS_ERR(inode))
332 return PTR_ERR(inode);
333 } else {
334 inode = dn->inode;
337 bidx = start_bidx_of_node(offset, inode) + le16_to_cpu(sum.ofs_in_node);
340 * if inode page is locked, unlock temporarily, but its reference
341 * count keeps alive.
343 if (ino == dn->inode->i_ino && dn->inode_page_locked)
344 unlock_page(dn->inode_page);
346 set_new_dnode(&tdn, inode, NULL, NULL, 0);
347 if (get_dnode_of_data(&tdn, bidx, LOOKUP_NODE))
348 goto out;
350 if (tdn.data_blkaddr == blkaddr)
351 truncate_data_blocks_range(&tdn, 1);
353 f2fs_put_dnode(&tdn);
354 out:
355 if (ino != dn->inode->i_ino)
356 iput(inode);
357 else if (dn->inode_page_locked)
358 lock_page(dn->inode_page);
359 return 0;
361 truncate_out:
362 if (datablock_addr(tdn.node_page, tdn.ofs_in_node) == blkaddr)
363 truncate_data_blocks_range(&tdn, 1);
364 if (dn->inode->i_ino == nid && !dn->inode_page_locked)
365 unlock_page(dn->inode_page);
366 return 0;
369 static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
370 struct page *page, block_t blkaddr)
372 struct dnode_of_data dn;
373 struct node_info ni;
374 unsigned int start, end;
375 int err = 0, recovered = 0;
377 /* step 1: recover xattr */
378 if (IS_INODE(page)) {
379 recover_inline_xattr(inode, page);
380 } else if (f2fs_has_xattr_block(ofs_of_node(page))) {
382 * Deprecated; xattr blocks should be found from cold log.
383 * But, we should remain this for backward compatibility.
385 recover_xattr_data(inode, page, blkaddr);
386 goto out;
389 /* step 2: recover inline data */
390 if (recover_inline_data(inode, page))
391 goto out;
393 /* step 3: recover data indices */
394 start = start_bidx_of_node(ofs_of_node(page), inode);
395 end = start + ADDRS_PER_PAGE(page, inode);
397 set_new_dnode(&dn, inode, NULL, NULL, 0);
398 retry_dn:
399 err = get_dnode_of_data(&dn, start, ALLOC_NODE);
400 if (err) {
401 if (err == -ENOMEM) {
402 congestion_wait(BLK_RW_ASYNC, HZ/50);
403 goto retry_dn;
405 goto out;
408 f2fs_wait_on_page_writeback(dn.node_page, NODE, true);
410 get_node_info(sbi, dn.nid, &ni);
411 f2fs_bug_on(sbi, ni.ino != ino_of_node(page));
413 if (ofs_of_node(dn.node_page) != ofs_of_node(page)) {
414 f2fs_msg(sbi->sb, KERN_WARNING,
415 "Inconsistent ofs_of_node, ino:%lu, ofs:%u, %u",
416 inode->i_ino, ofs_of_node(dn.node_page),
417 ofs_of_node(page));
418 err = -EFAULT;
419 goto err;
422 for (; start < end; start++, dn.ofs_in_node++) {
423 block_t src, dest;
425 src = datablock_addr(dn.node_page, dn.ofs_in_node);
426 dest = datablock_addr(page, dn.ofs_in_node);
428 /* skip recovering if dest is the same as src */
429 if (src == dest)
430 continue;
432 /* dest is invalid, just invalidate src block */
433 if (dest == NULL_ADDR) {
434 truncate_data_blocks_range(&dn, 1);
435 continue;
438 if ((start + 1) << PAGE_SHIFT > i_size_read(inode))
439 f2fs_i_size_write(inode, (start + 1) << PAGE_SHIFT);
442 * dest is reserved block, invalidate src block
443 * and then reserve one new block in dnode page.
445 if (dest == NEW_ADDR) {
446 truncate_data_blocks_range(&dn, 1);
447 reserve_new_block(&dn);
448 continue;
451 /* dest is valid block, try to recover from src to dest */
452 if (f2fs_is_valid_blkaddr(sbi, dest, META_POR)) {
454 if (src == NULL_ADDR) {
455 err = reserve_new_block(&dn);
456 #ifdef CONFIG_F2FS_FAULT_INJECTION
457 while (err)
458 err = reserve_new_block(&dn);
459 #endif
460 /* We should not get -ENOSPC */
461 f2fs_bug_on(sbi, err);
462 if (err)
463 goto err;
465 retry_prev:
466 /* Check the previous node page having this index */
467 err = check_index_in_prev_nodes(sbi, dest, &dn);
468 if (err) {
469 if (err == -ENOMEM) {
470 congestion_wait(BLK_RW_ASYNC, HZ/50);
471 goto retry_prev;
473 goto err;
476 /* write dummy data page */
477 f2fs_replace_block(sbi, &dn, src, dest,
478 ni.version, false, false);
479 recovered++;
483 copy_node_footer(dn.node_page, page);
484 fill_node_footer(dn.node_page, dn.nid, ni.ino,
485 ofs_of_node(page), false);
486 set_page_dirty(dn.node_page);
487 err:
488 f2fs_put_dnode(&dn);
489 out:
490 f2fs_msg(sbi->sb, KERN_NOTICE,
491 "recover_data: ino = %lx, recovered = %d blocks, err = %d",
492 inode->i_ino, recovered, err);
493 return err;
496 static int recover_data(struct f2fs_sb_info *sbi, struct list_head *inode_list,
497 struct list_head *dir_list)
499 struct curseg_info *curseg;
500 struct page *page = NULL;
501 int err = 0;
502 block_t blkaddr;
504 /* get node pages in the current segment */
505 curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
506 blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
508 while (1) {
509 struct fsync_inode_entry *entry;
511 if (!f2fs_is_valid_blkaddr(sbi, blkaddr, META_POR))
512 break;
514 ra_meta_pages_cond(sbi, blkaddr);
516 page = get_tmp_page(sbi, blkaddr);
518 if (!is_recoverable_dnode(page)) {
519 f2fs_put_page(page, 1);
520 break;
523 entry = get_fsync_inode(inode_list, ino_of_node(page));
524 if (!entry)
525 goto next;
527 * inode(x) | CP | inode(x) | dnode(F)
528 * In this case, we can lose the latest inode(x).
529 * So, call recover_inode for the inode update.
531 if (IS_INODE(page))
532 recover_inode(entry->inode, page);
533 if (entry->last_dentry == blkaddr) {
534 err = recover_dentry(entry->inode, page, dir_list);
535 if (err) {
536 f2fs_put_page(page, 1);
537 break;
540 err = do_recover_data(sbi, entry->inode, page, blkaddr);
541 if (err) {
542 f2fs_put_page(page, 1);
543 break;
546 if (entry->blkaddr == blkaddr)
547 del_fsync_inode(entry);
548 next:
549 /* check next segment */
550 blkaddr = next_blkaddr_of_node(page);
551 f2fs_put_page(page, 1);
553 if (!err)
554 allocate_new_segments(sbi);
555 return err;
558 int recover_fsync_data(struct f2fs_sb_info *sbi, bool check_only)
560 struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
561 struct list_head inode_list;
562 struct list_head dir_list;
563 block_t blkaddr;
564 int err;
565 int ret = 0;
566 bool need_writecp = false;
568 fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
569 sizeof(struct fsync_inode_entry));
570 if (!fsync_entry_slab)
571 return -ENOMEM;
573 INIT_LIST_HEAD(&inode_list);
574 INIT_LIST_HEAD(&dir_list);
576 /* prevent checkpoint */
577 mutex_lock(&sbi->cp_mutex);
579 blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
581 /* step #1: find fsynced inode numbers */
582 err = find_fsync_dnodes(sbi, &inode_list);
583 if (err || list_empty(&inode_list))
584 goto out;
586 if (check_only) {
587 ret = 1;
588 goto out;
591 need_writecp = true;
593 /* step #2: recover data */
594 err = recover_data(sbi, &inode_list, &dir_list);
595 if (!err)
596 f2fs_bug_on(sbi, !list_empty(&inode_list));
597 out:
598 destroy_fsync_dnodes(&inode_list);
600 /* truncate meta pages to be used by the recovery */
601 truncate_inode_pages_range(META_MAPPING(sbi),
602 (loff_t)MAIN_BLKADDR(sbi) << PAGE_SHIFT, -1);
604 if (err) {
605 truncate_inode_pages_final(NODE_MAPPING(sbi));
606 truncate_inode_pages_final(META_MAPPING(sbi));
609 clear_sbi_flag(sbi, SBI_POR_DOING);
610 mutex_unlock(&sbi->cp_mutex);
612 /* let's drop all the directory inodes for clean checkpoint */
613 destroy_fsync_dnodes(&dir_list);
615 if (!err && need_writecp) {
616 struct cp_control cpc = {
617 .reason = CP_RECOVERY,
619 err = write_checkpoint(sbi, &cpc);
622 kmem_cache_destroy(fsync_entry_slab);
623 return ret ? ret: err;