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TOMOYO Linux Cross Reference
Linux/fs/f2fs/recovery.c

Version: ~ [ linux-5.3-rc5 ] ~ [ linux-5.2.9 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.67 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.139 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.189 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.189 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.72 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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         if (sbi->last_valid_block_count + sbi->alloc_valid_block_count
 53                         > sbi->user_block_count)
 54                 return false;
 55         return true;
 56 }
 57 
 58 static struct fsync_inode_entry *get_fsync_inode(struct list_head *head,
 59                                                                 nid_t ino)
 60 {
 61         struct fsync_inode_entry *entry;
 62 
 63         list_for_each_entry(entry, head, list)
 64                 if (entry->inode->i_ino == ino)
 65                         return entry;
 66 
 67         return NULL;
 68 }
 69 
 70 static int recover_dentry(struct inode *inode, struct page *ipage)
 71 {
 72         struct f2fs_inode *raw_inode = F2FS_INODE(ipage);
 73         nid_t pino = le32_to_cpu(raw_inode->i_pino);
 74         struct f2fs_dir_entry *de;
 75         struct qstr name;
 76         struct page *page;
 77         struct inode *dir, *einode;
 78         int err = 0;
 79 
 80         dir = f2fs_iget(inode->i_sb, pino);
 81         if (IS_ERR(dir)) {
 82                 err = PTR_ERR(dir);
 83                 goto out;
 84         }
 85 
 86         if (file_enc_name(inode)) {
 87                 iput(dir);
 88                 return 0;
 89         }
 90 
 91         name.len = le32_to_cpu(raw_inode->i_namelen);
 92         name.name = raw_inode->i_name;
 93 
 94         if (unlikely(name.len > F2FS_NAME_LEN)) {
 95                 WARN_ON(1);
 96                 err = -ENAMETOOLONG;
 97                 goto out_err;
 98         }
 99 retry:
100         de = f2fs_find_entry(dir, &name, &page);
101         if (de && inode->i_ino == le32_to_cpu(de->ino))
102                 goto out_unmap_put;
103 
104         if (de) {
105                 einode = f2fs_iget(inode->i_sb, le32_to_cpu(de->ino));
106                 if (IS_ERR(einode)) {
107                         WARN_ON(1);
108                         err = PTR_ERR(einode);
109                         if (err == -ENOENT)
110                                 err = -EEXIST;
111                         goto out_unmap_put;
112                 }
113                 err = acquire_orphan_inode(F2FS_I_SB(inode));
114                 if (err) {
115                         iput(einode);
116                         goto out_unmap_put;
117                 }
118                 f2fs_delete_entry(de, page, dir, einode);
119                 iput(einode);
120                 goto retry;
121         }
122         err = __f2fs_add_link(dir, &name, inode, inode->i_ino, inode->i_mode);
123         if (err)
124                 goto out_err;
125 
126         if (is_inode_flag_set(F2FS_I(dir), FI_DELAY_IPUT)) {
127                 iput(dir);
128         } else {
129                 add_dirty_dir_inode(dir);
130                 set_inode_flag(F2FS_I(dir), FI_DELAY_IPUT);
131         }
132 
133         goto out;
134 
135 out_unmap_put:
136         f2fs_dentry_kunmap(dir, page);
137         f2fs_put_page(page, 0);
138 out_err:
139         iput(dir);
140 out:
141         f2fs_msg(inode->i_sb, KERN_NOTICE,
142                         "%s: ino = %x, name = %s, dir = %lx, err = %d",
143                         __func__, ino_of_node(ipage), raw_inode->i_name,
144                         IS_ERR(dir) ? 0 : dir->i_ino, err);
145         return err;
146 }
147 
148 static void recover_inode(struct inode *inode, struct page *page)
149 {
150         struct f2fs_inode *raw = F2FS_INODE(page);
151         char *name;
152 
153         inode->i_mode = le16_to_cpu(raw->i_mode);
154         i_size_write(inode, le64_to_cpu(raw->i_size));
155         inode->i_atime.tv_sec = le64_to_cpu(raw->i_mtime);
156         inode->i_ctime.tv_sec = le64_to_cpu(raw->i_ctime);
157         inode->i_mtime.tv_sec = le64_to_cpu(raw->i_mtime);
158         inode->i_atime.tv_nsec = le32_to_cpu(raw->i_mtime_nsec);
159         inode->i_ctime.tv_nsec = le32_to_cpu(raw->i_ctime_nsec);
160         inode->i_mtime.tv_nsec = le32_to_cpu(raw->i_mtime_nsec);
161 
162         if (file_enc_name(inode))
163                 name = "<encrypted>";
164         else
165                 name = F2FS_INODE(page)->i_name;
166 
167         f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode: ino = %x, name = %s",
168                         ino_of_node(page), name);
169 }
170 
171 static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head)
172 {
173         unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi));
174         struct curseg_info *curseg;
175         struct page *page = NULL;
176         block_t blkaddr;
177         int err = 0;
178 
179         /* get node pages in the current segment */
180         curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
181         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
182 
183         ra_meta_pages(sbi, blkaddr, 1, META_POR);
184 
185         while (1) {
186                 struct fsync_inode_entry *entry;
187 
188                 if (!is_valid_blkaddr(sbi, blkaddr, META_POR))
189                         return 0;
190 
191                 page = get_meta_page(sbi, blkaddr);
192 
193                 if (cp_ver != cpver_of_node(page))
194                         break;
195 
196                 if (!is_fsync_dnode(page))
197                         goto next;
198 
199                 entry = get_fsync_inode(head, ino_of_node(page));
200                 if (!entry) {
201                         if (IS_INODE(page) && is_dent_dnode(page)) {
202                                 err = recover_inode_page(sbi, page);
203                                 if (err)
204                                         break;
205                         }
206 
207                         /* add this fsync inode to the list */
208                         entry = kmem_cache_alloc(fsync_entry_slab, GFP_F2FS_ZERO);
209                         if (!entry) {
210                                 err = -ENOMEM;
211                                 break;
212                         }
213                         /*
214                          * CP | dnode(F) | inode(DF)
215                          * For this case, we should not give up now.
216                          */
217                         entry->inode = f2fs_iget(sbi->sb, ino_of_node(page));
218                         if (IS_ERR(entry->inode)) {
219                                 err = PTR_ERR(entry->inode);
220                                 kmem_cache_free(fsync_entry_slab, entry);
221                                 if (err == -ENOENT) {
222                                         err = 0;
223                                         goto next;
224                                 }
225                                 break;
226                         }
227                         list_add_tail(&entry->list, head);
228                 }
229                 entry->blkaddr = blkaddr;
230 
231                 if (IS_INODE(page)) {
232                         entry->last_inode = blkaddr;
233                         if (is_dent_dnode(page))
234                                 entry->last_dentry = blkaddr;
235                 }
236 next:
237                 /* check next segment */
238                 blkaddr = next_blkaddr_of_node(page);
239                 f2fs_put_page(page, 1);
240 
241                 ra_meta_pages_cond(sbi, blkaddr);
242         }
243         f2fs_put_page(page, 1);
244         return err;
245 }
246 
247 static void destroy_fsync_dnodes(struct list_head *head)
248 {
249         struct fsync_inode_entry *entry, *tmp;
250 
251         list_for_each_entry_safe(entry, tmp, head, list) {
252                 iput(entry->inode);
253                 list_del(&entry->list);
254                 kmem_cache_free(fsync_entry_slab, entry);
255         }
256 }
257 
258 static int check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
259                         block_t blkaddr, struct dnode_of_data *dn)
260 {
261         struct seg_entry *sentry;
262         unsigned int segno = GET_SEGNO(sbi, blkaddr);
263         unsigned short blkoff = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
264         struct f2fs_summary_block *sum_node;
265         struct f2fs_summary sum;
266         struct page *sum_page, *node_page;
267         struct dnode_of_data tdn = *dn;
268         nid_t ino, nid;
269         struct inode *inode;
270         unsigned int offset;
271         block_t bidx;
272         int i;
273 
274         sentry = get_seg_entry(sbi, segno);
275         if (!f2fs_test_bit(blkoff, sentry->cur_valid_map))
276                 return 0;
277 
278         /* Get the previous summary */
279         for (i = CURSEG_WARM_DATA; i <= CURSEG_COLD_DATA; i++) {
280                 struct curseg_info *curseg = CURSEG_I(sbi, i);
281                 if (curseg->segno == segno) {
282                         sum = curseg->sum_blk->entries[blkoff];
283                         goto got_it;
284                 }
285         }
286 
287         sum_page = get_sum_page(sbi, segno);
288         sum_node = (struct f2fs_summary_block *)page_address(sum_page);
289         sum = sum_node->entries[blkoff];
290         f2fs_put_page(sum_page, 1);
291 got_it:
292         /* Use the locked dnode page and inode */
293         nid = le32_to_cpu(sum.nid);
294         if (dn->inode->i_ino == nid) {
295                 tdn.nid = nid;
296                 if (!dn->inode_page_locked)
297                         lock_page(dn->inode_page);
298                 tdn.node_page = dn->inode_page;
299                 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
300                 goto truncate_out;
301         } else if (dn->nid == nid) {
302                 tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
303                 goto truncate_out;
304         }
305 
306         /* Get the node page */
307         node_page = get_node_page(sbi, nid);
308         if (IS_ERR(node_page))
309                 return PTR_ERR(node_page);
310 
311         offset = ofs_of_node(node_page);
312         ino = ino_of_node(node_page);
313         f2fs_put_page(node_page, 1);
314 
315         if (ino != dn->inode->i_ino) {
316                 /* Deallocate previous index in the node page */
317                 inode = f2fs_iget(sbi->sb, ino);
318                 if (IS_ERR(inode))
319                         return PTR_ERR(inode);
320         } else {
321                 inode = dn->inode;
322         }
323 
324         bidx = start_bidx_of_node(offset, F2FS_I(inode)) +
325                         le16_to_cpu(sum.ofs_in_node);
326 
327         /*
328          * if inode page is locked, unlock temporarily, but its reference
329          * count keeps alive.
330          */
331         if (ino == dn->inode->i_ino && dn->inode_page_locked)
332                 unlock_page(dn->inode_page);
333 
334         set_new_dnode(&tdn, inode, NULL, NULL, 0);
335         if (get_dnode_of_data(&tdn, bidx, LOOKUP_NODE))
336                 goto out;
337 
338         if (tdn.data_blkaddr == blkaddr)
339                 truncate_data_blocks_range(&tdn, 1);
340 
341         f2fs_put_dnode(&tdn);
342 out:
343         if (ino != dn->inode->i_ino)
344                 iput(inode);
345         else if (dn->inode_page_locked)
346                 lock_page(dn->inode_page);
347         return 0;
348 
349 truncate_out:
350         if (datablock_addr(tdn.node_page, tdn.ofs_in_node) == blkaddr)
351                 truncate_data_blocks_range(&tdn, 1);
352         if (dn->inode->i_ino == nid && !dn->inode_page_locked)
353                 unlock_page(dn->inode_page);
354         return 0;
355 }
356 
357 static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
358                                         struct page *page, block_t blkaddr)
359 {
360         struct f2fs_inode_info *fi = F2FS_I(inode);
361         unsigned int start, end;
362         struct dnode_of_data dn;
363         struct node_info ni;
364         int err = 0, recovered = 0;
365 
366         /* step 1: recover xattr */
367         if (IS_INODE(page)) {
368                 recover_inline_xattr(inode, page);
369         } else if (f2fs_has_xattr_block(ofs_of_node(page))) {
370                 /*
371                  * Deprecated; xattr blocks should be found from cold log.
372                  * But, we should remain this for backward compatibility.
373                  */
374                 recover_xattr_data(inode, page, blkaddr);
375                 goto out;
376         }
377 
378         /* step 2: recover inline data */
379         if (recover_inline_data(inode, page))
380                 goto out;
381 
382         /* step 3: recover data indices */
383         start = start_bidx_of_node(ofs_of_node(page), fi);
384         end = start + ADDRS_PER_PAGE(page, fi);
385 
386         f2fs_lock_op(sbi);
387 
388         set_new_dnode(&dn, inode, NULL, NULL, 0);
389 
390         err = get_dnode_of_data(&dn, start, ALLOC_NODE);
391         if (err) {
392                 f2fs_unlock_op(sbi);
393                 goto out;
394         }
395 
396         f2fs_wait_on_page_writeback(dn.node_page, NODE);
397 
398         get_node_info(sbi, dn.nid, &ni);
399         f2fs_bug_on(sbi, ni.ino != ino_of_node(page));
400         f2fs_bug_on(sbi, ofs_of_node(dn.node_page) != ofs_of_node(page));
401 
402         for (; start < end; start++) {
403                 block_t src, dest;
404 
405                 src = datablock_addr(dn.node_page, dn.ofs_in_node);
406                 dest = datablock_addr(page, dn.ofs_in_node);
407 
408                 if (src != dest && dest != NEW_ADDR && dest != NULL_ADDR &&
409                         is_valid_blkaddr(sbi, dest, META_POR)) {
410 
411                         if (src == NULL_ADDR) {
412                                 err = reserve_new_block(&dn);
413                                 /* We should not get -ENOSPC */
414                                 f2fs_bug_on(sbi, err);
415                         }
416 
417                         /* Check the previous node page having this index */
418                         err = check_index_in_prev_nodes(sbi, dest, &dn);
419                         if (err)
420                                 goto err;
421 
422                         /* write dummy data page */
423                         f2fs_replace_block(sbi, &dn, src, dest,
424                                                         ni.version, false);
425                         recovered++;
426                 }
427                 dn.ofs_in_node++;
428         }
429 
430         if (IS_INODE(dn.node_page))
431                 sync_inode_page(&dn);
432 
433         copy_node_footer(dn.node_page, page);
434         fill_node_footer(dn.node_page, dn.nid, ni.ino,
435                                         ofs_of_node(page), false);
436         set_page_dirty(dn.node_page);
437 err:
438         f2fs_put_dnode(&dn);
439         f2fs_unlock_op(sbi);
440 out:
441         f2fs_msg(sbi->sb, KERN_NOTICE,
442                 "recover_data: ino = %lx, recovered = %d blocks, err = %d",
443                 inode->i_ino, recovered, err);
444         return err;
445 }
446 
447 static int recover_data(struct f2fs_sb_info *sbi,
448                                 struct list_head *head, int type)
449 {
450         unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi));
451         struct curseg_info *curseg;
452         struct page *page = NULL;
453         int err = 0;
454         block_t blkaddr;
455 
456         /* get node pages in the current segment */
457         curseg = CURSEG_I(sbi, type);
458         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
459 
460         while (1) {
461                 struct fsync_inode_entry *entry;
462 
463                 if (!is_valid_blkaddr(sbi, blkaddr, META_POR))
464                         break;
465 
466                 ra_meta_pages_cond(sbi, blkaddr);
467 
468                 page = get_meta_page(sbi, blkaddr);
469 
470                 if (cp_ver != cpver_of_node(page)) {
471                         f2fs_put_page(page, 1);
472                         break;
473                 }
474 
475                 entry = get_fsync_inode(head, ino_of_node(page));
476                 if (!entry)
477                         goto next;
478                 /*
479                  * inode(x) | CP | inode(x) | dnode(F)
480                  * In this case, we can lose the latest inode(x).
481                  * So, call recover_inode for the inode update.
482                  */
483                 if (entry->last_inode == blkaddr)
484                         recover_inode(entry->inode, page);
485                 if (entry->last_dentry == blkaddr) {
486                         err = recover_dentry(entry->inode, page);
487                         if (err) {
488                                 f2fs_put_page(page, 1);
489                                 break;
490                         }
491                 }
492                 err = do_recover_data(sbi, entry->inode, page, blkaddr);
493                 if (err) {
494                         f2fs_put_page(page, 1);
495                         break;
496                 }
497 
498                 if (entry->blkaddr == blkaddr) {
499                         iput(entry->inode);
500                         list_del(&entry->list);
501                         kmem_cache_free(fsync_entry_slab, entry);
502                 }
503 next:
504                 /* check next segment */
505                 blkaddr = next_blkaddr_of_node(page);
506                 f2fs_put_page(page, 1);
507         }
508         if (!err)
509                 allocate_new_segments(sbi);
510         return err;
511 }
512 
513 int recover_fsync_data(struct f2fs_sb_info *sbi)
514 {
515         struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
516         struct list_head inode_list;
517         block_t blkaddr;
518         int err;
519         bool need_writecp = false;
520 
521         fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
522                         sizeof(struct fsync_inode_entry));
523         if (!fsync_entry_slab)
524                 return -ENOMEM;
525 
526         INIT_LIST_HEAD(&inode_list);
527 
528         /* step #1: find fsynced inode numbers */
529         set_sbi_flag(sbi, SBI_POR_DOING);
530 
531         /* prevent checkpoint */
532         mutex_lock(&sbi->cp_mutex);
533 
534         blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
535 
536         err = find_fsync_dnodes(sbi, &inode_list);
537         if (err)
538                 goto out;
539 
540         if (list_empty(&inode_list))
541                 goto out;
542 
543         need_writecp = true;
544 
545         /* step #2: recover data */
546         err = recover_data(sbi, &inode_list, CURSEG_WARM_NODE);
547         if (!err)
548                 f2fs_bug_on(sbi, !list_empty(&inode_list));
549 out:
550         destroy_fsync_dnodes(&inode_list);
551         kmem_cache_destroy(fsync_entry_slab);
552 
553         /* truncate meta pages to be used by the recovery */
554         truncate_inode_pages_range(META_MAPPING(sbi),
555                         MAIN_BLKADDR(sbi) << PAGE_CACHE_SHIFT, -1);
556 
557         if (err) {
558                 truncate_inode_pages_final(NODE_MAPPING(sbi));
559                 truncate_inode_pages_final(META_MAPPING(sbi));
560         }
561 
562         clear_sbi_flag(sbi, SBI_POR_DOING);
563         if (err) {
564                 discard_next_dnode(sbi, blkaddr);
565 
566                 /* Flush all the NAT/SIT pages */
567                 while (get_pages(sbi, F2FS_DIRTY_META))
568                         sync_meta_pages(sbi, META, LONG_MAX);
569                 set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG);
570                 mutex_unlock(&sbi->cp_mutex);
571         } else if (need_writecp) {
572                 struct cp_control cpc = {
573                         .reason = CP_RECOVERY,
574                 };
575                 mutex_unlock(&sbi->cp_mutex);
576                 write_checkpoint(sbi, &cpc);
577         } else {
578                 mutex_unlock(&sbi->cp_mutex);
579         }
580         return err;
581 }
582 

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