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-rw-r--r--fs/nilfs2/cpfile.c30
1 files changed, 18 insertions, 12 deletions
diff --git a/fs/nilfs2/cpfile.c b/fs/nilfs2/cpfile.c
index a4c9550fd774..50dff147744f 100644
--- a/fs/nilfs2/cpfile.c
+++ b/fs/nilfs2/cpfile.c
@@ -431,7 +431,7 @@ static ssize_t nilfs_cpfile_do_get_ssinfo(struct inode *cpfile, __u64 *cnop,
__u64 curr = *cnop, next;
unsigned long curr_blkoff, next_blkoff;
void *kaddr;
- int n, ret;
+ int n = 0, ret;
down_read(&NILFS_MDT(cpfile)->mi_sem);
@@ -455,27 +455,33 @@ static ssize_t nilfs_cpfile_do_get_ssinfo(struct inode *cpfile, __u64 *cnop,
curr_blkoff = nilfs_cpfile_get_blkoff(cpfile, curr);
ret = nilfs_cpfile_get_checkpoint_block(cpfile, curr, 0, &bh);
- if (ret < 0)
+ if (unlikely(ret < 0)) {
+ if (ret == -ENOENT)
+ ret = 0; /* No snapshots (started from a hole block) */
goto out;
+ }
kaddr = kmap_atomic(bh->b_page, KM_USER0);
- for (n = 0; n < nci; n++) {
- cp = nilfs_cpfile_block_get_checkpoint(
- cpfile, curr, bh, kaddr);
- nilfs_cpfile_checkpoint_to_cpinfo(cpfile, cp, &ci[n]);
- next = le64_to_cpu(cp->cp_snapshot_list.ssl_next);
- if (next == 0) {
- curr = ~(__u64)0; /* Terminator */
- n++;
+ while (n < nci) {
+ cp = nilfs_cpfile_block_get_checkpoint(cpfile, curr, bh, kaddr);
+ curr = ~(__u64)0; /* Terminator */
+ if (unlikely(nilfs_checkpoint_invalid(cp) ||
+ !nilfs_checkpoint_snapshot(cp)))
break;
- }
+ nilfs_cpfile_checkpoint_to_cpinfo(cpfile, cp, &ci[n++]);
+ next = le64_to_cpu(cp->cp_snapshot_list.ssl_next);
+ if (next == 0)
+ break; /* reach end of the snapshot list */
+
next_blkoff = nilfs_cpfile_get_blkoff(cpfile, next);
if (curr_blkoff != next_blkoff) {
kunmap_atomic(kaddr, KM_USER0);
brelse(bh);
ret = nilfs_cpfile_get_checkpoint_block(cpfile, next,
0, &bh);
- if (ret < 0)
+ if (unlikely(ret < 0)) {
+ WARN_ON(ret == -ENOENT);
goto out;
+ }
kaddr = kmap_atomic(bh->b_page, KM_USER0);
}
curr = next;