1 // SPDX-License-Identifier: GPL-2.0+
5 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
7 * Written by Ryusuke Konishi.
10 #include <linux/buffer_head.h>
11 #include <linux/blkdev.h>
12 #include <linux/swap.h>
13 #include <linux/slab.h>
14 #include <linux/crc32.h>
22 * Segment check result
26 NILFS_SEG_NO_SUPER_ROOT,
30 NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT,
31 NILFS_SEG_FAIL_CHECKSUM_FULL,
32 NILFS_SEG_FAIL_CONSISTENCY,
35 /* work structure for recovery */
36 struct nilfs_recovery_block {
38 * Inode number of the file that this block
41 sector_t blocknr; /* block number */
42 __u64 vblocknr; /* virtual block number */
43 unsigned long blkoff; /* File offset of the data block (per block) */
44 struct list_head list;
48 static int nilfs_warn_segment_error(struct super_block *sb, int err)
50 const char *msg = NULL;
53 case NILFS_SEG_FAIL_IO:
54 nilfs_err(sb, "I/O error reading segment");
56 case NILFS_SEG_FAIL_MAGIC:
57 msg = "Magic number mismatch";
59 case NILFS_SEG_FAIL_SEQ:
60 msg = "Sequence number mismatch";
62 case NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT:
63 msg = "Checksum error in super root";
65 case NILFS_SEG_FAIL_CHECKSUM_FULL:
66 msg = "Checksum error in segment payload";
68 case NILFS_SEG_FAIL_CONSISTENCY:
69 msg = "Inconsistency found";
71 case NILFS_SEG_NO_SUPER_ROOT:
72 msg = "No super root in the last segment";
75 nilfs_err(sb, "unrecognized segment error %d", err);
78 nilfs_warn(sb, "invalid segment: %s", msg);
83 * nilfs_compute_checksum - compute checksum of blocks continuously
84 * @nilfs: nilfs object
85 * @bhs: buffer head of start block
86 * @sum: place to store result
87 * @offset: offset bytes in the first block
88 * @check_bytes: number of bytes to be checked
89 * @start: DBN of start block
90 * @nblock: number of blocks to be checked
92 static int nilfs_compute_checksum(struct the_nilfs *nilfs,
93 struct buffer_head *bhs, u32 *sum,
94 unsigned long offset, u64 check_bytes,
95 sector_t start, unsigned long nblock)
97 unsigned int blocksize = nilfs->ns_blocksize;
101 BUG_ON(offset >= blocksize);
102 check_bytes -= offset;
103 size = min_t(u64, check_bytes, blocksize - offset);
104 crc = crc32_le(nilfs->ns_crc_seed,
105 (unsigned char *)bhs->b_data + offset, size);
108 struct buffer_head *bh;
110 bh = __bread(nilfs->ns_bdev, ++start, blocksize);
114 size = min_t(u64, check_bytes, blocksize);
115 crc = crc32_le(crc, bh->b_data, size);
117 } while (--nblock > 0);
124 * nilfs_read_super_root_block - read super root block
125 * @nilfs: nilfs object
126 * @sr_block: disk block number of the super root block
127 * @pbh: address of a buffer_head pointer to return super root buffer
128 * @check: CRC check flag
130 int nilfs_read_super_root_block(struct the_nilfs *nilfs, sector_t sr_block,
131 struct buffer_head **pbh, int check)
133 struct buffer_head *bh_sr;
134 struct nilfs_super_root *sr;
139 bh_sr = __bread(nilfs->ns_bdev, sr_block, nilfs->ns_blocksize);
140 if (unlikely(!bh_sr)) {
141 ret = NILFS_SEG_FAIL_IO;
145 sr = (struct nilfs_super_root *)bh_sr->b_data;
147 unsigned int bytes = le16_to_cpu(sr->sr_bytes);
149 if (bytes == 0 || bytes > nilfs->ns_blocksize) {
150 ret = NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT;
153 if (nilfs_compute_checksum(
154 nilfs, bh_sr, &crc, sizeof(sr->sr_sum), bytes,
156 ret = NILFS_SEG_FAIL_IO;
159 if (crc != le32_to_cpu(sr->sr_sum)) {
160 ret = NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT;
171 return nilfs_warn_segment_error(nilfs->ns_sb, ret);
175 * nilfs_read_log_header - read summary header of the specified log
176 * @nilfs: nilfs object
177 * @start_blocknr: start block number of the log
178 * @sum: pointer to return segment summary structure
180 static struct buffer_head *
181 nilfs_read_log_header(struct the_nilfs *nilfs, sector_t start_blocknr,
182 struct nilfs_segment_summary **sum)
184 struct buffer_head *bh_sum;
186 bh_sum = __bread(nilfs->ns_bdev, start_blocknr, nilfs->ns_blocksize);
188 *sum = (struct nilfs_segment_summary *)bh_sum->b_data;
193 * nilfs_validate_log - verify consistency of log
194 * @nilfs: nilfs object
195 * @seg_seq: sequence number of segment
196 * @bh_sum: buffer head of summary block
197 * @sum: segment summary struct
199 static int nilfs_validate_log(struct the_nilfs *nilfs, u64 seg_seq,
200 struct buffer_head *bh_sum,
201 struct nilfs_segment_summary *sum)
203 unsigned long nblock;
207 ret = NILFS_SEG_FAIL_MAGIC;
208 if (le32_to_cpu(sum->ss_magic) != NILFS_SEGSUM_MAGIC)
211 ret = NILFS_SEG_FAIL_SEQ;
212 if (le64_to_cpu(sum->ss_seq) != seg_seq)
215 nblock = le32_to_cpu(sum->ss_nblocks);
216 ret = NILFS_SEG_FAIL_CONSISTENCY;
217 if (unlikely(nblock == 0 || nblock > nilfs->ns_blocks_per_segment))
218 /* This limits the number of blocks read in the CRC check */
221 ret = NILFS_SEG_FAIL_IO;
222 if (nilfs_compute_checksum(nilfs, bh_sum, &crc, sizeof(sum->ss_datasum),
223 ((u64)nblock << nilfs->ns_blocksize_bits),
224 bh_sum->b_blocknr, nblock))
227 ret = NILFS_SEG_FAIL_CHECKSUM_FULL;
228 if (crc != le32_to_cpu(sum->ss_datasum))
236 * nilfs_read_summary_info - read an item on summary blocks of a log
237 * @nilfs: nilfs object
238 * @pbh: the current buffer head on summary blocks [in, out]
239 * @offset: the current byte offset on summary blocks [in, out]
240 * @bytes: byte size of the item to be read
242 static void *nilfs_read_summary_info(struct the_nilfs *nilfs,
243 struct buffer_head **pbh,
244 unsigned int *offset, unsigned int bytes)
249 BUG_ON((*pbh)->b_size < *offset);
250 if (bytes > (*pbh)->b_size - *offset) {
251 blocknr = (*pbh)->b_blocknr;
253 *pbh = __bread(nilfs->ns_bdev, blocknr + 1,
254 nilfs->ns_blocksize);
259 ptr = (*pbh)->b_data + *offset;
265 * nilfs_skip_summary_info - skip items on summary blocks of a log
266 * @nilfs: nilfs object
267 * @pbh: the current buffer head on summary blocks [in, out]
268 * @offset: the current byte offset on summary blocks [in, out]
269 * @bytes: byte size of the item to be skipped
270 * @count: number of items to be skipped
272 static void nilfs_skip_summary_info(struct the_nilfs *nilfs,
273 struct buffer_head **pbh,
274 unsigned int *offset, unsigned int bytes,
277 unsigned int rest_item_in_current_block
278 = ((*pbh)->b_size - *offset) / bytes;
280 if (count <= rest_item_in_current_block) {
281 *offset += bytes * count;
283 sector_t blocknr = (*pbh)->b_blocknr;
284 unsigned int nitem_per_block = (*pbh)->b_size / bytes;
287 count -= rest_item_in_current_block;
288 bcnt = DIV_ROUND_UP(count, nitem_per_block);
289 *offset = bytes * (count - (bcnt - 1) * nitem_per_block);
292 *pbh = __bread(nilfs->ns_bdev, blocknr + bcnt,
293 nilfs->ns_blocksize);
298 * nilfs_scan_dsync_log - get block information of a log written for data sync
299 * @nilfs: nilfs object
300 * @start_blocknr: start block number of the log
301 * @sum: log summary information
302 * @head: list head to add nilfs_recovery_block struct
304 static int nilfs_scan_dsync_log(struct the_nilfs *nilfs, sector_t start_blocknr,
305 struct nilfs_segment_summary *sum,
306 struct list_head *head)
308 struct buffer_head *bh;
310 u32 nfinfo, sumbytes;
315 nfinfo = le32_to_cpu(sum->ss_nfinfo);
319 sumbytes = le32_to_cpu(sum->ss_sumbytes);
320 blocknr = start_blocknr + DIV_ROUND_UP(sumbytes, nilfs->ns_blocksize);
321 bh = __bread(nilfs->ns_bdev, start_blocknr, nilfs->ns_blocksize);
325 offset = le16_to_cpu(sum->ss_bytes);
327 unsigned long nblocks, ndatablk, nnodeblk;
328 struct nilfs_finfo *finfo;
330 finfo = nilfs_read_summary_info(nilfs, &bh, &offset,
332 if (unlikely(!finfo))
335 ino = le64_to_cpu(finfo->fi_ino);
336 nblocks = le32_to_cpu(finfo->fi_nblocks);
337 ndatablk = le32_to_cpu(finfo->fi_ndatablk);
338 nnodeblk = nblocks - ndatablk;
340 while (ndatablk-- > 0) {
341 struct nilfs_recovery_block *rb;
342 struct nilfs_binfo_v *binfo;
344 binfo = nilfs_read_summary_info(nilfs, &bh, &offset,
346 if (unlikely(!binfo))
349 rb = kmalloc(sizeof(*rb), GFP_NOFS);
355 rb->blocknr = blocknr++;
356 rb->vblocknr = le64_to_cpu(binfo->bi_vblocknr);
357 rb->blkoff = le64_to_cpu(binfo->bi_blkoff);
358 /* INIT_LIST_HEAD(&rb->list); */
359 list_add_tail(&rb->list, head);
363 blocknr += nnodeblk; /* always 0 for data sync logs */
364 nilfs_skip_summary_info(nilfs, &bh, &offset, sizeof(__le64),
371 brelse(bh); /* brelse(NULL) is just ignored */
375 static void dispose_recovery_list(struct list_head *head)
377 while (!list_empty(head)) {
378 struct nilfs_recovery_block *rb;
380 rb = list_first_entry(head, struct nilfs_recovery_block, list);
386 struct nilfs_segment_entry {
387 struct list_head list;
391 static int nilfs_segment_list_add(struct list_head *head, __u64 segnum)
393 struct nilfs_segment_entry *ent = kmalloc(sizeof(*ent), GFP_NOFS);
398 ent->segnum = segnum;
399 INIT_LIST_HEAD(&ent->list);
400 list_add_tail(&ent->list, head);
404 void nilfs_dispose_segment_list(struct list_head *head)
406 while (!list_empty(head)) {
407 struct nilfs_segment_entry *ent;
409 ent = list_first_entry(head, struct nilfs_segment_entry, list);
410 list_del(&ent->list);
415 static int nilfs_prepare_segment_for_recovery(struct the_nilfs *nilfs,
416 struct super_block *sb,
417 struct nilfs_recovery_info *ri)
419 struct list_head *head = &ri->ri_used_segments;
420 struct nilfs_segment_entry *ent, *n;
421 struct inode *sufile = nilfs->ns_sufile;
426 segnum[0] = nilfs->ns_segnum;
427 segnum[1] = nilfs->ns_nextnum;
428 segnum[2] = ri->ri_segnum;
429 segnum[3] = ri->ri_nextnum;
432 * Releasing the next segment of the latest super root.
433 * The next segment is invalidated by this recovery.
435 err = nilfs_sufile_free(sufile, segnum[1]);
439 for (i = 1; i < 4; i++) {
440 err = nilfs_segment_list_add(head, segnum[i]);
446 * Collecting segments written after the latest super root.
447 * These are marked dirty to avoid being reallocated in the next write.
449 list_for_each_entry_safe(ent, n, head, list) {
450 if (ent->segnum != segnum[0]) {
451 err = nilfs_sufile_scrap(sufile, ent->segnum);
455 list_del(&ent->list);
459 /* Allocate new segments for recovery */
460 err = nilfs_sufile_alloc(sufile, &segnum[0]);
464 nilfs->ns_pseg_offset = 0;
465 nilfs->ns_seg_seq = ri->ri_seq + 2;
466 nilfs->ns_nextnum = nilfs->ns_segnum = segnum[0];
469 /* No need to recover sufile because it will be destroyed on error */
473 static int nilfs_recovery_copy_block(struct the_nilfs *nilfs,
474 struct nilfs_recovery_block *rb,
475 loff_t pos, struct page *page)
477 struct buffer_head *bh_org;
478 size_t from = pos & ~PAGE_MASK;
481 bh_org = __bread(nilfs->ns_bdev, rb->blocknr, nilfs->ns_blocksize);
482 if (unlikely(!bh_org))
485 kaddr = kmap_atomic(page);
486 memcpy(kaddr + from, bh_org->b_data, bh_org->b_size);
487 kunmap_atomic(kaddr);
492 static int nilfs_recover_dsync_blocks(struct the_nilfs *nilfs,
493 struct super_block *sb,
494 struct nilfs_root *root,
495 struct list_head *head,
496 unsigned long *nr_salvaged_blocks)
499 struct nilfs_recovery_block *rb, *n;
500 unsigned int blocksize = nilfs->ns_blocksize;
503 int err = 0, err2 = 0;
505 list_for_each_entry_safe(rb, n, head, list) {
506 inode = nilfs_iget(sb, root, rb->ino);
508 err = PTR_ERR(inode);
513 pos = rb->blkoff << inode->i_blkbits;
514 err = block_write_begin(inode->i_mapping, pos, blocksize,
515 &page, nilfs_get_block);
517 loff_t isize = inode->i_size;
519 if (pos + blocksize > isize)
520 nilfs_write_failed(inode->i_mapping,
525 err = nilfs_recovery_copy_block(nilfs, rb, pos, page);
529 err = nilfs_set_file_dirty(inode, 1);
533 block_write_end(NULL, inode->i_mapping, pos, blocksize,
534 blocksize, page, NULL);
539 (*nr_salvaged_blocks)++;
548 "error %d recovering data block (ino=%lu, block-offset=%llu)",
549 err, (unsigned long)rb->ino,
550 (unsigned long long)rb->blkoff);
554 iput(inode); /* iput(NULL) is just ignored */
555 list_del_init(&rb->list);
562 * nilfs_do_roll_forward - salvage logical segments newer than the latest
564 * @nilfs: nilfs object
565 * @sb: super block instance
566 * @ri: pointer to a nilfs_recovery_info
568 static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
569 struct super_block *sb,
570 struct nilfs_root *root,
571 struct nilfs_recovery_info *ri)
573 struct buffer_head *bh_sum = NULL;
574 struct nilfs_segment_summary *sum = NULL;
576 sector_t seg_start, seg_end; /* Starting/ending DBN of full segment */
577 unsigned long nsalvaged_blocks = 0;
580 __u64 segnum, nextnum = 0;
583 LIST_HEAD(dsync_blocks); /* list of data blocks to be recovered */
586 RF_DSYNC_ST, /* scanning data-sync segments */
588 int state = RF_INIT_ST;
590 pseg_start = ri->ri_lsegs_start;
591 seg_seq = ri->ri_lsegs_start_seq;
592 segnum = nilfs_get_segnum_of_block(nilfs, pseg_start);
593 nilfs_get_segment_range(nilfs, segnum, &seg_start, &seg_end);
595 while (segnum != ri->ri_segnum || pseg_start <= ri->ri_pseg_start) {
597 bh_sum = nilfs_read_log_header(nilfs, pseg_start, &sum);
603 ret = nilfs_validate_log(nilfs, seg_seq, bh_sum, sum);
605 if (ret == NILFS_SEG_FAIL_IO) {
612 flags = le16_to_cpu(sum->ss_flags);
613 if (flags & NILFS_SS_SR)
616 /* Found a valid partial segment; do recovery actions */
617 nextnum = nilfs_get_segnum_of_block(nilfs,
618 le64_to_cpu(sum->ss_next));
620 nilfs->ns_ctime = le64_to_cpu(sum->ss_create);
621 if (!(flags & NILFS_SS_GC))
622 nilfs->ns_nongc_ctime = nilfs->ns_ctime;
626 if (!(flags & NILFS_SS_LOGBGN) ||
627 !(flags & NILFS_SS_SYNDT))
632 if (!(flags & NILFS_SS_SYNDT))
635 err = nilfs_scan_dsync_log(nilfs, pseg_start, sum,
639 if (flags & NILFS_SS_LOGEND) {
640 err = nilfs_recover_dsync_blocks(
641 nilfs, sb, root, &dsync_blocks,
647 break; /* Fall through to try_next_pseg */
651 if (pseg_start == ri->ri_lsegs_end)
653 pseg_start += le32_to_cpu(sum->ss_nblocks);
654 if (pseg_start < seg_end)
659 if (pseg_start == ri->ri_lsegs_end)
663 /* Looking to the next full segment */
668 nilfs_get_segment_range(nilfs, segnum, &seg_start, &seg_end);
669 pseg_start = seg_start;
672 if (nsalvaged_blocks) {
673 nilfs_info(sb, "salvaged %lu blocks", nsalvaged_blocks);
674 ri->ri_need_recovery = NILFS_RECOVERY_ROLLFORWARD_DONE;
678 dispose_recovery_list(&dsync_blocks);
685 "error %d roll-forwarding partial segment at blocknr = %llu",
686 err, (unsigned long long)pseg_start);
690 static void nilfs_finish_roll_forward(struct the_nilfs *nilfs,
691 struct nilfs_recovery_info *ri)
693 struct buffer_head *bh;
696 if (nilfs_get_segnum_of_block(nilfs, ri->ri_lsegs_start) !=
697 nilfs_get_segnum_of_block(nilfs, ri->ri_super_root))
700 bh = __getblk(nilfs->ns_bdev, ri->ri_lsegs_start, nilfs->ns_blocksize);
702 memset(bh->b_data, 0, bh->b_size);
703 set_buffer_dirty(bh);
704 err = sync_dirty_buffer(bh);
706 nilfs_warn(nilfs->ns_sb,
707 "buffer sync write failed during post-cleaning of recovery.");
712 * nilfs_salvage_orphan_logs - salvage logs written after the latest checkpoint
713 * @nilfs: nilfs object
714 * @sb: super block instance
715 * @ri: pointer to a nilfs_recovery_info struct to store search results.
717 * Return Value: On success, 0 is returned. On error, one of the following
718 * negative error code is returned.
720 * %-EINVAL - Inconsistent filesystem state.
724 * %-ENOSPC - No space left on device (only in a panic state).
726 * %-ERESTARTSYS - Interrupted.
728 * %-ENOMEM - Insufficient memory available.
730 int nilfs_salvage_orphan_logs(struct the_nilfs *nilfs,
731 struct super_block *sb,
732 struct nilfs_recovery_info *ri)
734 struct nilfs_root *root;
737 if (ri->ri_lsegs_start == 0 || ri->ri_lsegs_end == 0)
740 err = nilfs_attach_checkpoint(sb, ri->ri_cno, true, &root);
742 nilfs_err(sb, "error %d loading the latest checkpoint", err);
746 err = nilfs_do_roll_forward(nilfs, sb, root, ri);
750 if (ri->ri_need_recovery == NILFS_RECOVERY_ROLLFORWARD_DONE) {
751 err = nilfs_prepare_segment_for_recovery(nilfs, sb, ri);
753 nilfs_err(sb, "error %d preparing segment for recovery",
758 err = nilfs_attach_log_writer(sb, root);
762 set_nilfs_discontinued(nilfs);
763 err = nilfs_construct_segment(sb);
764 nilfs_detach_log_writer(sb);
767 nilfs_err(sb, "error %d writing segment for recovery",
772 nilfs_finish_roll_forward(nilfs, ri);
776 nilfs_put_root(root);
781 * nilfs_search_super_root - search the latest valid super root
783 * @ri: pointer to a nilfs_recovery_info struct to store search results.
785 * nilfs_search_super_root() looks for the latest super-root from a partial
786 * segment pointed by the superblock. It sets up struct the_nilfs through
787 * this search. It fills nilfs_recovery_info (ri) required for recovery.
789 * Return Value: On success, 0 is returned. On error, one of the following
790 * negative error code is returned.
792 * %-EINVAL - No valid segment found
796 * %-ENOMEM - Insufficient memory available.
798 int nilfs_search_super_root(struct the_nilfs *nilfs,
799 struct nilfs_recovery_info *ri)
801 struct buffer_head *bh_sum = NULL;
802 struct nilfs_segment_summary *sum = NULL;
803 sector_t pseg_start, pseg_end, sr_pseg_start = 0;
804 sector_t seg_start, seg_end; /* range of full segment (block number) */
806 unsigned long nblocks;
809 __u64 segnum, nextnum = 0;
812 int empty_seg = 0, scan_newer = 0;
815 pseg_start = nilfs->ns_last_pseg;
816 seg_seq = nilfs->ns_last_seq;
817 cno = nilfs->ns_last_cno;
818 segnum = nilfs_get_segnum_of_block(nilfs, pseg_start);
820 /* Calculate range of segment */
821 nilfs_get_segment_range(nilfs, segnum, &seg_start, &seg_end);
823 /* Read ahead segment */
826 __breadahead(nilfs->ns_bdev, b++, nilfs->ns_blocksize);
830 ret = NILFS_SEG_FAIL_IO;
831 bh_sum = nilfs_read_log_header(nilfs, pseg_start, &sum);
835 ret = nilfs_validate_log(nilfs, seg_seq, bh_sum, sum);
837 if (ret == NILFS_SEG_FAIL_IO)
842 nblocks = le32_to_cpu(sum->ss_nblocks);
843 pseg_end = pseg_start + nblocks - 1;
844 if (unlikely(pseg_end > seg_end)) {
845 ret = NILFS_SEG_FAIL_CONSISTENCY;
849 /* A valid partial segment */
850 ri->ri_pseg_start = pseg_start;
851 ri->ri_seq = seg_seq;
852 ri->ri_segnum = segnum;
853 nextnum = nilfs_get_segnum_of_block(nilfs,
854 le64_to_cpu(sum->ss_next));
855 ri->ri_nextnum = nextnum;
858 flags = le16_to_cpu(sum->ss_flags);
859 if (!(flags & NILFS_SS_SR) && !scan_newer) {
861 * This will never happen because a superblock
862 * (last_segment) always points to a pseg with
865 ret = NILFS_SEG_FAIL_CONSISTENCY;
869 if (pseg_start == seg_start) {
870 nilfs_get_segment_range(nilfs, nextnum, &b, &end);
872 __breadahead(nilfs->ns_bdev, b++,
873 nilfs->ns_blocksize);
875 if (!(flags & NILFS_SS_SR)) {
876 if (!ri->ri_lsegs_start && (flags & NILFS_SS_LOGBGN)) {
877 ri->ri_lsegs_start = pseg_start;
878 ri->ri_lsegs_start_seq = seg_seq;
880 if (flags & NILFS_SS_LOGEND)
881 ri->ri_lsegs_end = pseg_start;
885 /* A valid super root was found. */
887 ri->ri_super_root = pseg_end;
888 ri->ri_lsegs_start = ri->ri_lsegs_end = 0;
890 nilfs_dispose_segment_list(&segments);
891 sr_pseg_start = pseg_start;
892 nilfs->ns_pseg_offset = pseg_start + nblocks - seg_start;
893 nilfs->ns_seg_seq = seg_seq;
894 nilfs->ns_segnum = segnum;
895 nilfs->ns_cno = cno; /* nilfs->ns_cno = ri->ri_cno + 1 */
896 nilfs->ns_ctime = le64_to_cpu(sum->ss_create);
897 nilfs->ns_nextnum = nextnum;
900 ri->ri_need_recovery = NILFS_RECOVERY_SR_UPDATED;
902 if (nilfs->ns_mount_state & NILFS_VALID_FS)
903 goto super_root_found;
908 /* Standing on a course, or met an inconsistent state */
909 pseg_start += nblocks;
910 if (pseg_start < seg_end)
918 * This can happen if a checkpoint was written without
919 * barriers, or as a result of an I/O failure.
924 /* Looking to the next full segment */
926 goto super_root_found; /* found a valid super root */
928 ret = nilfs_segment_list_add(&segments, segnum);
934 nilfs_get_segment_range(nilfs, segnum, &seg_start, &seg_end);
935 pseg_start = seg_start;
939 /* Updating pointers relating to the latest checkpoint */
941 list_splice_tail(&segments, &ri->ri_used_segments);
942 nilfs->ns_last_pseg = sr_pseg_start;
943 nilfs->ns_last_seq = nilfs->ns_seg_seq;
944 nilfs->ns_last_cno = ri->ri_cno;
949 nilfs_dispose_segment_list(&segments);
950 return ret < 0 ? ret : nilfs_warn_segment_error(nilfs->ns_sb, ret);