nilfs2: insert checkpoint number in segment summary header

This adds a field to record the latest checkpoint number in the
nilfs_segment_summary structure.  This will help to recover the latest
checkpoint number from logs on disk.  This field is intended for
crucial cases in which super blocks have lost pointer to the latest
log.

Even though this will change the disk format, both backward and
forward compatibility is preserved by a size field prepared in the
segment summary header.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index a17bfa193e3f..9f50fde0cd06 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -366,7 +366,8 @@ static int nilfs_segctor_reset_segment_buffer(struct nilfs_sc_info *sci)
 
         if (nilfs_doing_gc())
                 flags = NILFS_SS_GC;
-        err = nilfs_segbuf_reset(segbuf, flags, sci->sc_seg_ctime);
+        err = nilfs_segbuf_reset(segbuf, flags, sci->sc_seg_ctime,
+                                 sci->sc_sbi->s_nilfs->ns_cno);
         if (unlikely(err))
                 return err;