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 f2fs_sb_info
*sbi
,
72 struct list_head
*head
, nid_t ino
)
75 struct fsync_inode_entry
*entry
;
77 inode
= f2fs_iget_retry(sbi
->sb
, ino
);
79 return ERR_CAST(inode
);
81 entry
= f2fs_kmem_cache_alloc(fsync_entry_slab
, GFP_F2FS_ZERO
);
83 list_add_tail(&entry
->list
, head
);
88 static void del_fsync_inode(struct fsync_inode_entry
*entry
)
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
;
103 struct inode
*dir
, *einode
;
104 struct fsync_inode_entry
*entry
;
108 entry
= get_fsync_inode(dir_list
, pino
);
110 entry
= add_fsync_inode(F2FS_I_SB(inode
), dir_list
, pino
);
112 dir
= ERR_CAST(entry
);
113 err
= PTR_ERR(entry
);
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
)) {
130 de
= __f2fs_find_entry(dir
, &fname
, &page
);
131 if (de
&& inode
->i_ino
== le32_to_cpu(de
->ino
))
135 einode
= f2fs_iget_retry(inode
->i_sb
, le32_to_cpu(de
->ino
));
136 if (IS_ERR(einode
)) {
138 err
= PTR_ERR(einode
);
143 err
= acquire_orphan_inode(F2FS_I_SB(inode
));
148 f2fs_delete_entry(de
, page
, dir
, einode
);
151 } else if (IS_ERR(page
)) {
154 err
= __f2fs_do_add_link(dir
, &fname
, inode
,
155 inode
->i_ino
, inode
->i_mode
);
162 f2fs_dentry_kunmap(dir
, page
);
163 f2fs_put_page(page
, 0);
165 if (file_enc_name(inode
))
166 name
= "<encrypted>";
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
);
176 static void recover_inode(struct inode
*inode
, struct page
*page
)
178 struct f2fs_inode
*raw
= F2FS_INODE(page
);
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>";
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
;
208 /* get node pages in the current segment */
209 curseg
= CURSEG_I(sbi
, CURSEG_WARM_NODE
);
210 blkaddr
= NEXT_FREE_BLKADDR(sbi
, curseg
);
213 struct fsync_inode_entry
*entry
;
215 if (!f2fs_is_valid_blkaddr(sbi
, blkaddr
, META_POR
))
218 page
= get_tmp_page(sbi
, blkaddr
);
220 if (!is_recoverable_dnode(page
))
223 if (!is_fsync_dnode(page
))
226 entry
= get_fsync_inode(head
, ino_of_node(page
));
228 if (IS_INODE(page
) && is_dent_dnode(page
)) {
229 err
= recover_inode_page(sbi
, page
);
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
));
240 err
= PTR_ERR(entry
);
241 if (err
== -ENOENT
) {
248 entry
->blkaddr
= blkaddr
;
250 if (IS_INODE(page
) && is_dent_dnode(page
))
251 entry
->last_dentry
= blkaddr
;
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);
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
;
287 sentry
= get_seg_entry(sbi
, segno
);
288 if (!f2fs_test_bit(blkoff
, sentry
->cur_valid_map
))
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
];
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);
305 /* Use the locked dnode page and inode */
306 nid
= le32_to_cpu(sum
.nid
);
307 if (dn
->inode
->i_ino
== 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
);
314 } else if (dn
->nid
== nid
) {
315 tdn
.ofs_in_node
= le16_to_cpu(sum
.ofs_in_node
);
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
);
332 return PTR_ERR(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
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
))
350 if (tdn
.data_blkaddr
== blkaddr
)
351 truncate_data_blocks_range(&tdn
, 1);
353 f2fs_put_dnode(&tdn
);
355 if (ino
!= dn
->inode
->i_ino
)
357 else if (dn
->inode_page_locked
)
358 lock_page(dn
->inode_page
);
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
);
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
;
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
);
389 /* step 2: recover inline data */
390 if (recover_inline_data(inode
, page
))
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);
399 err
= get_dnode_of_data(&dn
, start
, ALLOC_NODE
);
401 if (err
== -ENOMEM
) {
402 congestion_wait(BLK_RW_ASYNC
, HZ
/50);
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
),
422 for (; start
< end
; start
++, dn
.ofs_in_node
++) {
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 */
432 /* dest is invalid, just invalidate src block */
433 if (dest
== NULL_ADDR
) {
434 truncate_data_blocks_range(&dn
, 1);
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
);
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
458 err
= reserve_new_block(&dn
);
460 /* We should not get -ENOSPC */
461 f2fs_bug_on(sbi
, err
);
466 /* Check the previous node page having this index */
467 err
= check_index_in_prev_nodes(sbi
, dest
, &dn
);
469 if (err
== -ENOMEM
) {
470 congestion_wait(BLK_RW_ASYNC
, HZ
/50);
476 /* write dummy data page */
477 f2fs_replace_block(sbi
, &dn
, src
, dest
,
478 ni
.version
, false, false);
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
);
490 f2fs_msg(sbi
->sb
, KERN_NOTICE
,
491 "recover_data: ino = %lx, recovered = %d blocks, err = %d",
492 inode
->i_ino
, recovered
, 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
;
504 /* get node pages in the current segment */
505 curseg
= CURSEG_I(sbi
, CURSEG_WARM_NODE
);
506 blkaddr
= NEXT_FREE_BLKADDR(sbi
, curseg
);
509 struct fsync_inode_entry
*entry
;
511 if (!f2fs_is_valid_blkaddr(sbi
, blkaddr
, META_POR
))
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);
523 entry
= get_fsync_inode(inode_list
, ino_of_node(page
));
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.
532 recover_inode(entry
->inode
, page
);
533 if (entry
->last_dentry
== blkaddr
) {
534 err
= recover_dentry(entry
->inode
, page
, dir_list
);
536 f2fs_put_page(page
, 1);
540 err
= do_recover_data(sbi
, entry
->inode
, page
, blkaddr
);
542 f2fs_put_page(page
, 1);
546 if (entry
->blkaddr
== blkaddr
)
547 del_fsync_inode(entry
);
549 /* check next segment */
550 blkaddr
= next_blkaddr_of_node(page
);
551 f2fs_put_page(page
, 1);
554 allocate_new_segments(sbi
);
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
;
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
)
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
))
593 /* step #2: recover data */
594 err
= recover_data(sbi
, &inode_list
, &dir_list
);
596 f2fs_bug_on(sbi
, !list_empty(&inode_list
));
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);
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
;