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.
12 #include <linux/f2fs_fs.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)
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)
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)
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
)
59 static struct fsync_inode_entry
*get_fsync_inode(struct list_head
*head
,
62 struct fsync_inode_entry
*entry
;
64 list_for_each_entry(entry
, head
, list
)
65 if (entry
->inode
->i_ino
== ino
)
71 static struct fsync_inode_entry
*add_fsync_inode(struct list_head
*head
,
74 struct fsync_inode_entry
*entry
;
76 entry
= kmem_cache_alloc(fsync_entry_slab
, GFP_F2FS_ZERO
);
81 list_add_tail(&entry
->list
, head
);
86 static void del_fsync_inode(struct fsync_inode_entry
*entry
)
89 list_del(&entry
->list
);
90 kmem_cache_free(fsync_entry_slab
, entry
);
93 static int recover_dentry(struct inode
*inode
, struct page
*ipage
,
94 struct list_head
*dir_list
)
96 struct f2fs_inode
*raw_inode
= F2FS_INODE(ipage
);
97 nid_t pino
= le32_to_cpu(raw_inode
->i_pino
);
98 struct f2fs_dir_entry
*de
;
101 struct inode
*dir
, *einode
;
102 struct fsync_inode_entry
*entry
;
105 entry
= get_fsync_inode(dir_list
, pino
);
107 dir
= f2fs_iget(inode
->i_sb
, pino
);
113 entry
= add_fsync_inode(dir_list
, dir
);
123 if (file_enc_name(inode
))
126 name
.len
= le32_to_cpu(raw_inode
->i_namelen
);
127 name
.name
= raw_inode
->i_name
;
129 if (unlikely(name
.len
> F2FS_NAME_LEN
)) {
135 de
= f2fs_find_entry(dir
, &name
, &page
);
136 if (de
&& inode
->i_ino
== le32_to_cpu(de
->ino
))
140 einode
= f2fs_iget(inode
->i_sb
, le32_to_cpu(de
->ino
));
141 if (IS_ERR(einode
)) {
143 err
= PTR_ERR(einode
);
148 err
= acquire_orphan_inode(F2FS_I_SB(inode
));
153 f2fs_delete_entry(de
, page
, dir
, einode
);
157 err
= __f2fs_add_link(dir
, &name
, inode
, inode
->i_ino
, inode
->i_mode
);
162 f2fs_dentry_kunmap(dir
, page
);
163 f2fs_put_page(page
, 0);
165 f2fs_msg(inode
->i_sb
, KERN_NOTICE
,
166 "%s: ino = %x, name = %s, dir = %lx, err = %d",
167 __func__
, ino_of_node(ipage
), raw_inode
->i_name
,
168 IS_ERR(dir
) ? 0 : dir
->i_ino
, err
);
172 static void recover_inode(struct inode
*inode
, struct page
*page
)
174 struct f2fs_inode
*raw
= F2FS_INODE(page
);
177 inode
->i_mode
= le16_to_cpu(raw
->i_mode
);
178 i_size_write(inode
, le64_to_cpu(raw
->i_size
));
179 inode
->i_atime
.tv_sec
= le64_to_cpu(raw
->i_mtime
);
180 inode
->i_ctime
.tv_sec
= le64_to_cpu(raw
->i_ctime
);
181 inode
->i_mtime
.tv_sec
= le64_to_cpu(raw
->i_mtime
);
182 inode
->i_atime
.tv_nsec
= le32_to_cpu(raw
->i_mtime_nsec
);
183 inode
->i_ctime
.tv_nsec
= le32_to_cpu(raw
->i_ctime_nsec
);
184 inode
->i_mtime
.tv_nsec
= le32_to_cpu(raw
->i_mtime_nsec
);
186 if (file_enc_name(inode
))
187 name
= "<encrypted>";
189 name
= F2FS_INODE(page
)->i_name
;
191 f2fs_msg(inode
->i_sb
, KERN_NOTICE
, "recover_inode: ino = %x, name = %s",
192 ino_of_node(page
), name
);
195 static bool is_same_inode(struct inode
*inode
, struct page
*ipage
)
197 struct f2fs_inode
*ri
= F2FS_INODE(ipage
);
198 struct timespec disk
;
200 if (!IS_INODE(ipage
))
203 disk
.tv_sec
= le64_to_cpu(ri
->i_ctime
);
204 disk
.tv_nsec
= le32_to_cpu(ri
->i_ctime_nsec
);
205 if (timespec_compare(&inode
->i_ctime
, &disk
) > 0)
208 disk
.tv_sec
= le64_to_cpu(ri
->i_atime
);
209 disk
.tv_nsec
= le32_to_cpu(ri
->i_atime_nsec
);
210 if (timespec_compare(&inode
->i_atime
, &disk
) > 0)
213 disk
.tv_sec
= le64_to_cpu(ri
->i_mtime
);
214 disk
.tv_nsec
= le32_to_cpu(ri
->i_mtime_nsec
);
215 if (timespec_compare(&inode
->i_mtime
, &disk
) > 0)
221 static int find_fsync_dnodes(struct f2fs_sb_info
*sbi
, struct list_head
*head
)
223 unsigned long long cp_ver
= cur_cp_version(F2FS_CKPT(sbi
));
224 struct curseg_info
*curseg
;
226 struct page
*page
= NULL
;
230 /* get node pages in the current segment */
231 curseg
= CURSEG_I(sbi
, CURSEG_WARM_NODE
);
232 blkaddr
= NEXT_FREE_BLKADDR(sbi
, curseg
);
235 struct fsync_inode_entry
*entry
;
237 if (!is_valid_blkaddr(sbi
, blkaddr
, META_POR
))
240 page
= get_tmp_page(sbi
, blkaddr
);
242 if (cp_ver
!= cpver_of_node(page
))
245 if (!is_fsync_dnode(page
))
248 entry
= get_fsync_inode(head
, ino_of_node(page
));
250 if (!is_same_inode(entry
->inode
, page
))
253 if (IS_INODE(page
) && is_dent_dnode(page
)) {
254 err
= recover_inode_page(sbi
, page
);
260 * CP | dnode(F) | inode(DF)
261 * For this case, we should not give up now.
263 inode
= f2fs_iget(sbi
->sb
, ino_of_node(page
));
265 err
= PTR_ERR(inode
);
266 if (err
== -ENOENT
) {
273 /* add this fsync inode to the list */
274 entry
= add_fsync_inode(head
, inode
);
281 entry
->blkaddr
= blkaddr
;
283 if (IS_INODE(page
) && is_dent_dnode(page
))
284 entry
->last_dentry
= blkaddr
;
286 /* check next segment */
287 blkaddr
= next_blkaddr_of_node(page
);
288 f2fs_put_page(page
, 1);
290 ra_meta_pages_cond(sbi
, blkaddr
);
292 f2fs_put_page(page
, 1);
296 static void destroy_fsync_dnodes(struct list_head
*head
)
298 struct fsync_inode_entry
*entry
, *tmp
;
300 list_for_each_entry_safe(entry
, tmp
, head
, list
)
301 del_fsync_inode(entry
);
304 static int check_index_in_prev_nodes(struct f2fs_sb_info
*sbi
,
305 block_t blkaddr
, struct dnode_of_data
*dn
)
307 struct seg_entry
*sentry
;
308 unsigned int segno
= GET_SEGNO(sbi
, blkaddr
);
309 unsigned short blkoff
= GET_BLKOFF_FROM_SEG0(sbi
, blkaddr
);
310 struct f2fs_summary_block
*sum_node
;
311 struct f2fs_summary sum
;
312 struct page
*sum_page
, *node_page
;
313 struct dnode_of_data tdn
= *dn
;
320 sentry
= get_seg_entry(sbi
, segno
);
321 if (!f2fs_test_bit(blkoff
, sentry
->cur_valid_map
))
324 /* Get the previous summary */
325 for (i
= CURSEG_WARM_DATA
; i
<= CURSEG_COLD_DATA
; i
++) {
326 struct curseg_info
*curseg
= CURSEG_I(sbi
, i
);
327 if (curseg
->segno
== segno
) {
328 sum
= curseg
->sum_blk
->entries
[blkoff
];
333 sum_page
= get_sum_page(sbi
, segno
);
334 sum_node
= (struct f2fs_summary_block
*)page_address(sum_page
);
335 sum
= sum_node
->entries
[blkoff
];
336 f2fs_put_page(sum_page
, 1);
338 /* Use the locked dnode page and inode */
339 nid
= le32_to_cpu(sum
.nid
);
340 if (dn
->inode
->i_ino
== nid
) {
342 if (!dn
->inode_page_locked
)
343 lock_page(dn
->inode_page
);
344 tdn
.node_page
= dn
->inode_page
;
345 tdn
.ofs_in_node
= le16_to_cpu(sum
.ofs_in_node
);
347 } else if (dn
->nid
== nid
) {
348 tdn
.ofs_in_node
= le16_to_cpu(sum
.ofs_in_node
);
352 /* Get the node page */
353 node_page
= get_node_page(sbi
, nid
);
354 if (IS_ERR(node_page
))
355 return PTR_ERR(node_page
);
357 offset
= ofs_of_node(node_page
);
358 ino
= ino_of_node(node_page
);
359 f2fs_put_page(node_page
, 1);
361 if (ino
!= dn
->inode
->i_ino
) {
362 /* Deallocate previous index in the node page */
363 inode
= f2fs_iget(sbi
->sb
, ino
);
365 return PTR_ERR(inode
);
370 bidx
= start_bidx_of_node(offset
, inode
) + le16_to_cpu(sum
.ofs_in_node
);
373 * if inode page is locked, unlock temporarily, but its reference
376 if (ino
== dn
->inode
->i_ino
&& dn
->inode_page_locked
)
377 unlock_page(dn
->inode_page
);
379 set_new_dnode(&tdn
, inode
, NULL
, NULL
, 0);
380 if (get_dnode_of_data(&tdn
, bidx
, LOOKUP_NODE
))
383 if (tdn
.data_blkaddr
== blkaddr
)
384 truncate_data_blocks_range(&tdn
, 1);
386 f2fs_put_dnode(&tdn
);
388 if (ino
!= dn
->inode
->i_ino
)
390 else if (dn
->inode_page_locked
)
391 lock_page(dn
->inode_page
);
395 if (datablock_addr(tdn
.node_page
, tdn
.ofs_in_node
) == blkaddr
)
396 truncate_data_blocks_range(&tdn
, 1);
397 if (dn
->inode
->i_ino
== nid
&& !dn
->inode_page_locked
)
398 unlock_page(dn
->inode_page
);
402 static int do_recover_data(struct f2fs_sb_info
*sbi
, struct inode
*inode
,
403 struct page
*page
, block_t blkaddr
)
405 struct dnode_of_data dn
;
407 unsigned int start
, end
;
408 int err
= 0, recovered
= 0;
410 /* step 1: recover xattr */
411 if (IS_INODE(page
)) {
412 recover_inline_xattr(inode
, page
);
413 } else if (f2fs_has_xattr_block(ofs_of_node(page
))) {
415 * Deprecated; xattr blocks should be found from cold log.
416 * But, we should remain this for backward compatibility.
418 recover_xattr_data(inode
, page
, blkaddr
);
422 /* step 2: recover inline data */
423 if (recover_inline_data(inode
, page
))
426 /* step 3: recover data indices */
427 start
= start_bidx_of_node(ofs_of_node(page
), inode
);
428 end
= start
+ ADDRS_PER_PAGE(page
, inode
);
430 set_new_dnode(&dn
, inode
, NULL
, NULL
, 0);
432 err
= get_dnode_of_data(&dn
, start
, ALLOC_NODE
);
436 f2fs_wait_on_page_writeback(dn
.node_page
, NODE
, true);
438 get_node_info(sbi
, dn
.nid
, &ni
);
439 f2fs_bug_on(sbi
, ni
.ino
!= ino_of_node(page
));
440 f2fs_bug_on(sbi
, ofs_of_node(dn
.node_page
) != ofs_of_node(page
));
442 for (; start
< end
; start
++, dn
.ofs_in_node
++) {
445 src
= datablock_addr(dn
.node_page
, dn
.ofs_in_node
);
446 dest
= datablock_addr(page
, dn
.ofs_in_node
);
448 /* skip recovering if dest is the same as src */
452 /* dest is invalid, just invalidate src block */
453 if (dest
== NULL_ADDR
) {
454 truncate_data_blocks_range(&dn
, 1);
459 * dest is reserved block, invalidate src block
460 * and then reserve one new block in dnode page.
462 if (dest
== NEW_ADDR
) {
463 truncate_data_blocks_range(&dn
, 1);
464 reserve_new_block(&dn
);
468 /* dest is valid block, try to recover from src to dest */
469 if (is_valid_blkaddr(sbi
, dest
, META_POR
)) {
471 if (src
== NULL_ADDR
) {
472 err
= reserve_new_block(&dn
);
473 #ifdef CONFIG_F2FS_FAULT_INJECTION
475 err
= reserve_new_block(&dn
);
477 /* We should not get -ENOSPC */
478 f2fs_bug_on(sbi
, err
);
481 /* Check the previous node page having this index */
482 err
= check_index_in_prev_nodes(sbi
, dest
, &dn
);
486 /* write dummy data page */
487 f2fs_replace_block(sbi
, &dn
, src
, dest
,
488 ni
.version
, false, false);
493 if (IS_INODE(dn
.node_page
))
494 sync_inode_page(&dn
);
496 copy_node_footer(dn
.node_page
, page
);
497 fill_node_footer(dn
.node_page
, dn
.nid
, ni
.ino
,
498 ofs_of_node(page
), false);
499 set_page_dirty(dn
.node_page
);
503 f2fs_msg(sbi
->sb
, KERN_NOTICE
,
504 "recover_data: ino = %lx, recovered = %d blocks, err = %d",
505 inode
->i_ino
, recovered
, err
);
509 static int recover_data(struct f2fs_sb_info
*sbi
, struct list_head
*inode_list
,
510 struct list_head
*dir_list
)
512 unsigned long long cp_ver
= cur_cp_version(F2FS_CKPT(sbi
));
513 struct curseg_info
*curseg
;
514 struct page
*page
= NULL
;
518 /* get node pages in the current segment */
519 curseg
= CURSEG_I(sbi
, CURSEG_WARM_NODE
);
520 blkaddr
= NEXT_FREE_BLKADDR(sbi
, curseg
);
523 struct fsync_inode_entry
*entry
;
525 if (!is_valid_blkaddr(sbi
, blkaddr
, META_POR
))
528 ra_meta_pages_cond(sbi
, blkaddr
);
530 page
= get_tmp_page(sbi
, blkaddr
);
532 if (cp_ver
!= cpver_of_node(page
)) {
533 f2fs_put_page(page
, 1);
537 entry
= get_fsync_inode(inode_list
, ino_of_node(page
));
541 * inode(x) | CP | inode(x) | dnode(F)
542 * In this case, we can lose the latest inode(x).
543 * So, call recover_inode for the inode update.
546 recover_inode(entry
->inode
, page
);
547 if (entry
->last_dentry
== blkaddr
) {
548 err
= recover_dentry(entry
->inode
, page
, dir_list
);
550 f2fs_put_page(page
, 1);
554 err
= do_recover_data(sbi
, entry
->inode
, page
, blkaddr
);
556 f2fs_put_page(page
, 1);
560 if (entry
->blkaddr
== blkaddr
)
561 del_fsync_inode(entry
);
563 /* check next segment */
564 blkaddr
= next_blkaddr_of_node(page
);
565 f2fs_put_page(page
, 1);
568 allocate_new_segments(sbi
);
572 int recover_fsync_data(struct f2fs_sb_info
*sbi
, bool check_only
)
574 struct curseg_info
*curseg
= CURSEG_I(sbi
, CURSEG_WARM_NODE
);
575 struct list_head inode_list
;
576 struct list_head dir_list
;
580 bool need_writecp
= false;
582 fsync_entry_slab
= f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
583 sizeof(struct fsync_inode_entry
));
584 if (!fsync_entry_slab
)
587 INIT_LIST_HEAD(&inode_list
);
588 INIT_LIST_HEAD(&dir_list
);
590 /* prevent checkpoint */
591 mutex_lock(&sbi
->cp_mutex
);
593 blkaddr
= NEXT_FREE_BLKADDR(sbi
, curseg
);
595 /* step #1: find fsynced inode numbers */
596 err
= find_fsync_dnodes(sbi
, &inode_list
);
597 if (err
|| list_empty(&inode_list
))
607 /* step #2: recover data */
608 err
= recover_data(sbi
, &inode_list
, &dir_list
);
610 f2fs_bug_on(sbi
, !list_empty(&inode_list
));
612 destroy_fsync_dnodes(&inode_list
);
614 /* truncate meta pages to be used by the recovery */
615 truncate_inode_pages_range(META_MAPPING(sbi
),
616 (loff_t
)MAIN_BLKADDR(sbi
) << PAGE_SHIFT
, -1);
619 truncate_inode_pages_final(NODE_MAPPING(sbi
));
620 truncate_inode_pages_final(META_MAPPING(sbi
));
623 clear_sbi_flag(sbi
, SBI_POR_DOING
);
625 bool invalidate
= false;
627 if (discard_next_dnode(sbi
, blkaddr
))
630 /* Flush all the NAT/SIT pages */
631 while (get_pages(sbi
, F2FS_DIRTY_META
))
632 sync_meta_pages(sbi
, META
, LONG_MAX
);
634 /* invalidate temporary meta page */
636 invalidate_mapping_pages(META_MAPPING(sbi
),
639 set_ckpt_flags(sbi
->ckpt
, CP_ERROR_FLAG
);
640 mutex_unlock(&sbi
->cp_mutex
);
641 } else if (need_writecp
) {
642 struct cp_control cpc
= {
643 .reason
= CP_RECOVERY
,
645 mutex_unlock(&sbi
->cp_mutex
);
646 err
= write_checkpoint(sbi
, &cpc
);
648 mutex_unlock(&sbi
->cp_mutex
);
651 destroy_fsync_dnodes(&dir_list
);
652 kmem_cache_destroy(fsync_entry_slab
);
653 return ret
? ret
: err
;
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