2 * recovery.c - NILFS recovery logic
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * Written by Ryusuke Konishi <ryusuke@osrg.net>
23 #include <linux/buffer_head.h>
24 #include <linux/blkdev.h>
25 #include <linux/swap.h>
26 #include <linux/crc32.h>
34 * Segment check result
38 NILFS_SEG_NO_SUPER_ROOT,
42 NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT,
43 NILFS_SEG_FAIL_CHECKSUM_FULL,
44 NILFS_SEG_FAIL_CONSISTENCY,
47 /* work structure for recovery */
48 struct nilfs_recovery_block {
49 ino_t ino; /* Inode number of the file that this block
51 sector_t blocknr; /* block number */
52 __u64 vblocknr; /* virtual block number */
53 unsigned long blkoff; /* File offset of the data block (per block) */
54 struct list_head list;
58 static int nilfs_warn_segment_error(int err)
61 case NILFS_SEG_FAIL_IO:
63 "NILFS warning: I/O error on loading last segment\n");
65 case NILFS_SEG_FAIL_MAGIC:
67 "NILFS warning: Segment magic number invalid\n");
69 case NILFS_SEG_FAIL_SEQ:
71 "NILFS warning: Sequence number mismatch\n");
73 case NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT:
75 "NILFS warning: Checksum error in super root\n");
77 case NILFS_SEG_FAIL_CHECKSUM_FULL:
79 "NILFS warning: Checksum error in segment payload\n");
81 case NILFS_SEG_FAIL_CONSISTENCY:
83 "NILFS warning: Inconsistent segment\n");
85 case NILFS_SEG_NO_SUPER_ROOT:
87 "NILFS warning: No super root in the last segment\n");
93 static void store_segsum_info(struct nilfs_segsum_info *ssi,
94 struct nilfs_segment_summary *sum,
95 unsigned int blocksize)
97 ssi->flags = le16_to_cpu(sum->ss_flags);
98 ssi->seg_seq = le64_to_cpu(sum->ss_seq);
99 ssi->ctime = le64_to_cpu(sum->ss_create);
100 ssi->next = le64_to_cpu(sum->ss_next);
101 ssi->nblocks = le32_to_cpu(sum->ss_nblocks);
102 ssi->nfinfo = le32_to_cpu(sum->ss_nfinfo);
103 ssi->sumbytes = le32_to_cpu(sum->ss_sumbytes);
105 ssi->nsumblk = DIV_ROUND_UP(ssi->sumbytes, blocksize);
106 ssi->nfileblk = ssi->nblocks - ssi->nsumblk - !!NILFS_SEG_HAS_SR(ssi);
110 * calc_crc_cont - check CRC of blocks continuously
111 * @sbi: nilfs_sb_info
112 * @bhs: buffer head of start block
113 * @sum: place to store result
114 * @offset: offset bytes in the first block
115 * @check_bytes: number of bytes to be checked
116 * @start: DBN of start block
117 * @nblock: number of blocks to be checked
119 static int calc_crc_cont(struct nilfs_sb_info *sbi, struct buffer_head *bhs,
120 u32 *sum, unsigned long offset, u64 check_bytes,
121 sector_t start, unsigned long nblock)
123 unsigned long blocksize = sbi->s_super->s_blocksize;
127 BUG_ON(offset >= blocksize);
128 check_bytes -= offset;
129 size = min_t(u64, check_bytes, blocksize - offset);
130 crc = crc32_le(sbi->s_nilfs->ns_crc_seed,
131 (unsigned char *)bhs->b_data + offset, size);
134 struct buffer_head *bh
135 = sb_bread(sbi->s_super, ++start);
139 size = min_t(u64, check_bytes, blocksize);
140 crc = crc32_le(crc, bh->b_data, size);
142 } while (--nblock > 0);
149 * nilfs_read_super_root_block - read super root block
151 * @sr_block: disk block number of the super root block
152 * @pbh: address of a buffer_head pointer to return super root buffer
153 * @check: CRC check flag
155 int nilfs_read_super_root_block(struct super_block *sb, sector_t sr_block,
156 struct buffer_head **pbh, int check)
158 struct buffer_head *bh_sr;
159 struct nilfs_super_root *sr;
164 bh_sr = sb_bread(sb, sr_block);
165 if (unlikely(!bh_sr)) {
166 ret = NILFS_SEG_FAIL_IO;
170 sr = (struct nilfs_super_root *)bh_sr->b_data;
172 unsigned bytes = le16_to_cpu(sr->sr_bytes);
174 if (bytes == 0 || bytes > sb->s_blocksize) {
175 ret = NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT;
178 if (calc_crc_cont(NILFS_SB(sb), bh_sr, &crc,
179 sizeof(sr->sr_sum), bytes, sr_block, 1)) {
180 ret = NILFS_SEG_FAIL_IO;
183 if (crc != le32_to_cpu(sr->sr_sum)) {
184 ret = NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT;
195 return nilfs_warn_segment_error(ret);
199 * load_segment_summary - read segment summary of the specified partial segment
200 * @sbi: nilfs_sb_info
201 * @pseg_start: start disk block number of partial segment
202 * @seg_seq: sequence number requested
203 * @ssi: pointer to nilfs_segsum_info struct to store information
206 load_segment_summary(struct nilfs_sb_info *sbi, sector_t pseg_start,
207 u64 seg_seq, struct nilfs_segsum_info *ssi)
209 struct buffer_head *bh_sum;
210 struct nilfs_segment_summary *sum;
211 unsigned long nblock;
213 int ret = NILFS_SEG_FAIL_IO;
215 bh_sum = sb_bread(sbi->s_super, pseg_start);
219 sum = (struct nilfs_segment_summary *)bh_sum->b_data;
221 /* Check consistency of segment summary */
222 if (le32_to_cpu(sum->ss_magic) != NILFS_SEGSUM_MAGIC) {
223 ret = NILFS_SEG_FAIL_MAGIC;
226 store_segsum_info(ssi, sum, sbi->s_super->s_blocksize);
227 if (seg_seq != ssi->seg_seq) {
228 ret = NILFS_SEG_FAIL_SEQ;
232 nblock = ssi->nblocks;
233 if (unlikely(nblock == 0 ||
234 nblock > sbi->s_nilfs->ns_blocks_per_segment)) {
235 /* This limits the number of blocks read in the CRC check */
236 ret = NILFS_SEG_FAIL_CONSISTENCY;
239 if (calc_crc_cont(sbi, bh_sum, &crc, sizeof(sum->ss_datasum),
240 ((u64)nblock << sbi->s_super->s_blocksize_bits),
241 pseg_start, nblock)) {
242 ret = NILFS_SEG_FAIL_IO;
245 if (crc == le32_to_cpu(sum->ss_datasum))
248 ret = NILFS_SEG_FAIL_CHECKSUM_FULL;
255 static void *segsum_get(struct super_block *sb, struct buffer_head **pbh,
256 unsigned int *offset, unsigned int bytes)
261 BUG_ON((*pbh)->b_size < *offset);
262 if (bytes > (*pbh)->b_size - *offset) {
263 blocknr = (*pbh)->b_blocknr;
265 *pbh = sb_bread(sb, blocknr + 1);
270 ptr = (*pbh)->b_data + *offset;
275 static void segsum_skip(struct super_block *sb, struct buffer_head **pbh,
276 unsigned int *offset, unsigned int bytes,
279 unsigned int rest_item_in_current_block
280 = ((*pbh)->b_size - *offset) / bytes;
282 if (count <= rest_item_in_current_block) {
283 *offset += bytes * count;
285 sector_t blocknr = (*pbh)->b_blocknr;
286 unsigned int nitem_per_block = (*pbh)->b_size / bytes;
289 count -= rest_item_in_current_block;
290 bcnt = DIV_ROUND_UP(count, nitem_per_block);
291 *offset = bytes * (count - (bcnt - 1) * nitem_per_block);
294 *pbh = sb_bread(sb, blocknr + bcnt);
299 collect_blocks_from_segsum(struct nilfs_sb_info *sbi, sector_t sum_blocknr,
300 struct nilfs_segsum_info *ssi,
301 struct list_head *head)
303 struct buffer_head *bh;
305 unsigned long nfinfo = ssi->nfinfo;
306 sector_t blocknr = sum_blocknr + ssi->nsumblk;
313 bh = sb_bread(sbi->s_super, sum_blocknr);
317 offset = le16_to_cpu(
318 ((struct nilfs_segment_summary *)bh->b_data)->ss_bytes);
320 unsigned long nblocks, ndatablk, nnodeblk;
321 struct nilfs_finfo *finfo;
323 finfo = segsum_get(sbi->s_super, &bh, &offset, sizeof(*finfo));
324 if (unlikely(!finfo))
327 ino = le64_to_cpu(finfo->fi_ino);
328 nblocks = le32_to_cpu(finfo->fi_nblocks);
329 ndatablk = le32_to_cpu(finfo->fi_ndatablk);
330 nnodeblk = nblocks - ndatablk;
332 while (ndatablk-- > 0) {
333 struct nilfs_recovery_block *rb;
334 struct nilfs_binfo_v *binfo;
336 binfo = segsum_get(sbi->s_super, &bh, &offset,
338 if (unlikely(!binfo))
341 rb = kmalloc(sizeof(*rb), GFP_NOFS);
347 rb->blocknr = blocknr++;
348 rb->vblocknr = le64_to_cpu(binfo->bi_vblocknr);
349 rb->blkoff = le64_to_cpu(binfo->bi_blkoff);
350 /* INIT_LIST_HEAD(&rb->list); */
351 list_add_tail(&rb->list, head);
355 blocknr += nnodeblk; /* always 0 for the data sync segments */
356 segsum_skip(sbi->s_super, &bh, &offset, sizeof(__le64),
363 brelse(bh); /* brelse(NULL) is just ignored */
367 static void dispose_recovery_list(struct list_head *head)
369 while (!list_empty(head)) {
370 struct nilfs_recovery_block *rb
371 = list_entry(head->next,
372 struct nilfs_recovery_block, list);
378 struct nilfs_segment_entry {
379 struct list_head list;
383 static int nilfs_segment_list_add(struct list_head *head, __u64 segnum)
385 struct nilfs_segment_entry *ent = kmalloc(sizeof(*ent), GFP_NOFS);
390 ent->segnum = segnum;
391 INIT_LIST_HEAD(&ent->list);
392 list_add_tail(&ent->list, head);
396 void nilfs_dispose_segment_list(struct list_head *head)
398 while (!list_empty(head)) {
399 struct nilfs_segment_entry *ent
400 = list_entry(head->next,
401 struct nilfs_segment_entry, list);
402 list_del(&ent->list);
407 static int nilfs_prepare_segment_for_recovery(struct the_nilfs *nilfs,
408 struct nilfs_sb_info *sbi,
409 struct nilfs_recovery_info *ri)
411 struct list_head *head = &ri->ri_used_segments;
412 struct nilfs_segment_entry *ent, *n;
413 struct inode *sufile = nilfs->ns_sufile;
418 segnum[0] = nilfs->ns_segnum;
419 segnum[1] = nilfs->ns_nextnum;
420 segnum[2] = ri->ri_segnum;
421 segnum[3] = ri->ri_nextnum;
423 nilfs_attach_writer(nilfs, sbi);
425 * Releasing the next segment of the latest super root.
426 * The next segment is invalidated by this recovery.
428 err = nilfs_sufile_free(sufile, segnum[1]);
432 for (i = 1; i < 4; i++) {
433 err = nilfs_segment_list_add(head, segnum[i]);
439 * Collecting segments written after the latest super root.
440 * These are marked dirty to avoid being reallocated in the next write.
442 list_for_each_entry_safe(ent, n, head, list) {
443 if (ent->segnum != segnum[0]) {
444 err = nilfs_sufile_scrap(sufile, ent->segnum);
448 list_del(&ent->list);
452 /* Allocate new segments for recovery */
453 err = nilfs_sufile_alloc(sufile, &segnum[0]);
457 nilfs->ns_pseg_offset = 0;
458 nilfs->ns_seg_seq = ri->ri_seq + 2;
459 nilfs->ns_nextnum = nilfs->ns_segnum = segnum[0];
462 /* No need to recover sufile because it will be destroyed on error */
463 nilfs_detach_writer(nilfs, sbi);
467 static int nilfs_recovery_copy_block(struct nilfs_sb_info *sbi,
468 struct nilfs_recovery_block *rb,
471 struct buffer_head *bh_org;
474 bh_org = sb_bread(sbi->s_super, rb->blocknr);
475 if (unlikely(!bh_org))
478 kaddr = kmap_atomic(page, KM_USER0);
479 memcpy(kaddr + bh_offset(bh_org), bh_org->b_data, bh_org->b_size);
480 kunmap_atomic(kaddr, KM_USER0);
485 static int recover_dsync_blocks(struct nilfs_sb_info *sbi,
486 struct list_head *head,
487 unsigned long *nr_salvaged_blocks)
490 struct nilfs_recovery_block *rb, *n;
491 unsigned blocksize = sbi->s_super->s_blocksize;
494 int err = 0, err2 = 0;
496 list_for_each_entry_safe(rb, n, head, list) {
497 inode = nilfs_iget(sbi->s_super, rb->ino);
499 err = PTR_ERR(inode);
504 pos = rb->blkoff << inode->i_blkbits;
506 err = block_write_begin(NULL, inode->i_mapping, pos, blocksize,
507 0, &page, NULL, nilfs_get_block);
511 err = nilfs_recovery_copy_block(sbi, rb, page);
515 err = nilfs_set_file_dirty(sbi, inode, 1);
519 block_write_end(NULL, inode->i_mapping, pos, blocksize,
520 blocksize, page, NULL);
523 page_cache_release(page);
525 (*nr_salvaged_blocks)++;
530 page_cache_release(page);
534 "NILFS warning: error recovering data block "
535 "(err=%d, ino=%lu, block-offset=%llu)\n",
536 err, (unsigned long)rb->ino,
537 (unsigned long long)rb->blkoff);
541 iput(inode); /* iput(NULL) is just ignored */
542 list_del_init(&rb->list);
549 * nilfs_do_roll_forward - salvage logical segments newer than the latest
551 * @sbi: nilfs_sb_info
553 * @ri: pointer to a nilfs_recovery_info
555 static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
556 struct nilfs_sb_info *sbi,
557 struct nilfs_recovery_info *ri)
559 struct nilfs_segsum_info ssi;
561 sector_t seg_start, seg_end; /* Starting/ending DBN of full segment */
562 unsigned long nsalvaged_blocks = 0;
564 __u64 segnum, nextnum = 0;
567 LIST_HEAD(dsync_blocks); /* list of data blocks to be recovered */
570 RF_DSYNC_ST, /* scanning data-sync segments */
572 int state = RF_INIT_ST;
574 nilfs_attach_writer(nilfs, sbi);
575 pseg_start = ri->ri_lsegs_start;
576 seg_seq = ri->ri_lsegs_start_seq;
577 segnum = nilfs_get_segnum_of_block(nilfs, pseg_start);
578 nilfs_get_segment_range(nilfs, segnum, &seg_start, &seg_end);
580 while (segnum != ri->ri_segnum || pseg_start <= ri->ri_pseg_start) {
582 ret = load_segment_summary(sbi, pseg_start, seg_seq, &ssi);
584 if (ret == NILFS_SEG_FAIL_IO) {
590 if (unlikely(NILFS_SEG_HAS_SR(&ssi)))
593 /* Found a valid partial segment; do recovery actions */
594 nextnum = nilfs_get_segnum_of_block(nilfs, ssi.next);
596 nilfs->ns_ctime = ssi.ctime;
597 if (!(ssi.flags & NILFS_SS_GC))
598 nilfs->ns_nongc_ctime = ssi.ctime;
602 if (!NILFS_SEG_LOGBGN(&ssi) || !NILFS_SEG_DSYNC(&ssi))
607 if (!NILFS_SEG_DSYNC(&ssi))
610 err = collect_blocks_from_segsum(
611 sbi, pseg_start, &ssi, &dsync_blocks);
614 if (NILFS_SEG_LOGEND(&ssi)) {
615 err = recover_dsync_blocks(
616 sbi, &dsync_blocks, &nsalvaged_blocks);
621 break; /* Fall through to try_next_pseg */
625 if (pseg_start == ri->ri_lsegs_end)
627 pseg_start += ssi.nblocks;
628 if (pseg_start < seg_end)
633 if (pseg_start == ri->ri_lsegs_end)
637 /* Looking to the next full segment */
642 nilfs_get_segment_range(nilfs, segnum, &seg_start, &seg_end);
643 pseg_start = seg_start;
646 if (nsalvaged_blocks) {
647 printk(KERN_INFO "NILFS (device %s): salvaged %lu blocks\n",
648 sbi->s_super->s_id, nsalvaged_blocks);
649 ri->ri_need_recovery = NILFS_RECOVERY_ROLLFORWARD_DONE;
652 dispose_recovery_list(&dsync_blocks);
653 nilfs_detach_writer(sbi->s_nilfs, sbi);
660 "NILFS (device %s): Error roll-forwarding "
661 "(err=%d, pseg block=%llu). ",
662 sbi->s_super->s_id, err, (unsigned long long)pseg_start);
666 static void nilfs_finish_roll_forward(struct the_nilfs *nilfs,
667 struct nilfs_sb_info *sbi,
668 struct nilfs_recovery_info *ri)
670 struct buffer_head *bh;
673 if (nilfs_get_segnum_of_block(nilfs, ri->ri_lsegs_start) !=
674 nilfs_get_segnum_of_block(nilfs, ri->ri_super_root))
677 bh = sb_getblk(sbi->s_super, ri->ri_lsegs_start);
679 memset(bh->b_data, 0, bh->b_size);
680 set_buffer_dirty(bh);
681 err = sync_dirty_buffer(bh);
684 "NILFS warning: buffer sync write failed during "
685 "post-cleaning of recovery.\n");
690 * nilfs_recover_logical_segments - salvage logical segments written after
691 * the latest super root
693 * @sbi: nilfs_sb_info
694 * @ri: pointer to a nilfs_recovery_info struct to store search results.
696 * Return Value: On success, 0 is returned. On error, one of the following
697 * negative error code is returned.
699 * %-EINVAL - Inconsistent filesystem state.
703 * %-ENOSPC - No space left on device (only in a panic state).
705 * %-ERESTARTSYS - Interrupted.
707 * %-ENOMEM - Insufficient memory available.
709 int nilfs_recover_logical_segments(struct the_nilfs *nilfs,
710 struct nilfs_sb_info *sbi,
711 struct nilfs_recovery_info *ri)
715 if (ri->ri_lsegs_start == 0 || ri->ri_lsegs_end == 0)
718 err = nilfs_attach_checkpoint(sbi, ri->ri_cno);
721 "NILFS: error loading the latest checkpoint.\n");
725 err = nilfs_do_roll_forward(nilfs, sbi, ri);
729 if (ri->ri_need_recovery == NILFS_RECOVERY_ROLLFORWARD_DONE) {
730 err = nilfs_prepare_segment_for_recovery(nilfs, sbi, ri);
732 printk(KERN_ERR "NILFS: Error preparing segments for "
737 err = nilfs_attach_segment_constructor(sbi);
741 set_nilfs_discontinued(nilfs);
742 err = nilfs_construct_segment(sbi->s_super);
743 nilfs_detach_segment_constructor(sbi);
746 printk(KERN_ERR "NILFS: Oops! recovery failed. "
751 nilfs_finish_roll_forward(nilfs, sbi, ri);
755 nilfs_detach_checkpoint(sbi);
760 * nilfs_search_super_root - search the latest valid super root
762 * @sbi: nilfs_sb_info
763 * @ri: pointer to a nilfs_recovery_info struct to store search results.
765 * nilfs_search_super_root() looks for the latest super-root from a partial
766 * segment pointed by the superblock. It sets up struct the_nilfs through
767 * this search. It fills nilfs_recovery_info (ri) required for recovery.
769 * Return Value: On success, 0 is returned. On error, one of the following
770 * negative error code is returned.
772 * %-EINVAL - No valid segment found
776 int nilfs_search_super_root(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi,
777 struct nilfs_recovery_info *ri)
779 struct nilfs_segsum_info ssi;
780 sector_t pseg_start, pseg_end, sr_pseg_start = 0;
781 sector_t seg_start, seg_end; /* range of full segment (block number) */
784 __u64 segnum, nextnum = 0;
787 int empty_seg = 0, scan_newer = 0;
790 pseg_start = nilfs->ns_last_pseg;
791 seg_seq = nilfs->ns_last_seq;
792 cno = nilfs->ns_last_cno;
793 segnum = nilfs_get_segnum_of_block(nilfs, pseg_start);
795 /* Calculate range of segment */
796 nilfs_get_segment_range(nilfs, segnum, &seg_start, &seg_end);
798 /* Read ahead segment */
801 sb_breadahead(sbi->s_super, b++);
804 /* Load segment summary */
805 ret = load_segment_summary(sbi, pseg_start, seg_seq, &ssi);
807 if (ret == NILFS_SEG_FAIL_IO)
811 pseg_end = pseg_start + ssi.nblocks - 1;
812 if (unlikely(pseg_end > seg_end)) {
813 ret = NILFS_SEG_FAIL_CONSISTENCY;
817 /* A valid partial segment */
818 ri->ri_pseg_start = pseg_start;
819 ri->ri_seq = seg_seq;
820 ri->ri_segnum = segnum;
821 nextnum = nilfs_get_segnum_of_block(nilfs, ssi.next);
822 ri->ri_nextnum = nextnum;
825 if (!NILFS_SEG_HAS_SR(&ssi) && !scan_newer) {
826 /* This will never happen because a superblock
827 (last_segment) always points to a pseg
828 having a super root. */
829 ret = NILFS_SEG_FAIL_CONSISTENCY;
833 if (pseg_start == seg_start) {
834 nilfs_get_segment_range(nilfs, nextnum, &b, &end);
836 sb_breadahead(sbi->s_super, b++);
838 if (!NILFS_SEG_HAS_SR(&ssi)) {
839 if (!ri->ri_lsegs_start && NILFS_SEG_LOGBGN(&ssi)) {
840 ri->ri_lsegs_start = pseg_start;
841 ri->ri_lsegs_start_seq = seg_seq;
843 if (NILFS_SEG_LOGEND(&ssi))
844 ri->ri_lsegs_end = pseg_start;
848 /* A valid super root was found. */
850 ri->ri_super_root = pseg_end;
851 ri->ri_lsegs_start = ri->ri_lsegs_end = 0;
853 nilfs_dispose_segment_list(&segments);
854 nilfs->ns_pseg_offset = (sr_pseg_start = pseg_start)
855 + ssi.nblocks - seg_start;
856 nilfs->ns_seg_seq = seg_seq;
857 nilfs->ns_segnum = segnum;
858 nilfs->ns_cno = cno; /* nilfs->ns_cno = ri->ri_cno + 1 */
859 nilfs->ns_ctime = ssi.ctime;
860 nilfs->ns_nextnum = nextnum;
863 ri->ri_need_recovery = NILFS_RECOVERY_SR_UPDATED;
865 if (nilfs->ns_mount_state & NILFS_VALID_FS)
866 goto super_root_found;
870 /* reset region for roll-forward */
871 pseg_start += ssi.nblocks;
872 if (pseg_start < seg_end)
877 /* Standing on a course, or met an inconsistent state */
878 pseg_start += ssi.nblocks;
879 if (pseg_start < seg_end)
887 * This can happen if a checkpoint was written without
888 * barriers, or as a result of an I/O failure.
893 /* Looking to the next full segment */
895 goto super_root_found; /* found a valid super root */
897 ret = nilfs_segment_list_add(&segments, segnum);
903 nilfs_get_segment_range(nilfs, segnum, &seg_start, &seg_end);
904 pseg_start = seg_start;
908 /* Updating pointers relating to the latest checkpoint */
909 list_splice_tail(&segments, &ri->ri_used_segments);
910 nilfs->ns_last_pseg = sr_pseg_start;
911 nilfs->ns_last_seq = nilfs->ns_seg_seq;
912 nilfs->ns_last_cno = ri->ri_cno;
916 nilfs_dispose_segment_list(&segments);
917 return (ret < 0) ? ret : nilfs_warn_segment_error(ret);