5 files changed, 12 insertions, 3 deletions

diff --git a/fs/nilfs2/recovery.c b/fs/nilfs2/recovery.c
index ba43146f3c30..bae2a516b4ee 100644
--- a/fs/nilfs2/recovery.c
+++ b/fs/nilfs2/recovery.c
@@ -105,6 +105,8 @@ static void store_segsum_info(struct nilfs_segsum_info *ssi,
 
         ssi->nsumblk = DIV_ROUND_UP(ssi->sumbytes, blocksize);
         ssi->nfileblk = ssi->nblocks - ssi->nsumblk - !!NILFS_SEG_HAS_SR(ssi);
+
+        /* need to verify ->ss_bytes field if read ->ss_cno */
 }
 
 /**
diff --git a/fs/nilfs2/segbuf.c b/fs/nilfs2/segbuf.c
index 9f83bc02593c..2e6a2723b8fa 100644
--- a/fs/nilfs2/segbuf.c
+++ b/fs/nilfs2/segbuf.c
@@ -134,7 +134,7 @@ int nilfs_segbuf_extend_payload(struct nilfs_segment_buffer *segbuf,
 }
 
 int nilfs_segbuf_reset(struct nilfs_segment_buffer *segbuf, unsigned flags,
-                       time_t ctime)
+                       time_t ctime, __u64 cno)
 {
         int err;
 
@@ -147,6 +147,7 @@ int nilfs_segbuf_reset(struct nilfs_segment_buffer *segbuf, unsigned flags,
         segbuf->sb_sum.sumbytes = sizeof(struct nilfs_segment_summary);
         segbuf->sb_sum.nfinfo = segbuf->sb_sum.nfileblk = 0;
         segbuf->sb_sum.ctime = ctime;
+        segbuf->sb_sum.cno = cno;
         return 0;
 }
 
@@ -172,6 +173,7 @@ void nilfs_segbuf_fill_in_segsum(struct nilfs_segment_buffer *segbuf)
         raw_sum->ss_nfinfo   = cpu_to_le32(segbuf->sb_sum.nfinfo);
         raw_sum->ss_sumbytes = cpu_to_le32(segbuf->sb_sum.sumbytes);
         raw_sum->ss_pad      = 0;
+        raw_sum->ss_cno      = cpu_to_le64(segbuf->sb_sum.cno);
 }
 
 /*
diff --git a/fs/nilfs2/segbuf.h b/fs/nilfs2/segbuf.h
index e21497f61b0c..fdf1c3b6d673 100644
--- a/fs/nilfs2/segbuf.h
+++ b/fs/nilfs2/segbuf.h
@@ -37,6 +37,7 @@
  * @sumbytes: Byte count of segment summary
  * @nfileblk: Total number of file blocks
  * @seg_seq: Segment sequence number
+ * @cno: Checkpoint number
  * @ctime: Creation time
  * @next: Block number of the next full segment
  */
@@ -48,6 +49,7 @@ struct nilfs_segsum_info {
         unsigned long           sumbytes;
         unsigned long           nfileblk;
         u64                     seg_seq;
+        __u64                   cno;
         time_t                  ctime;
         sector_t                next;
 };
@@ -135,7 +137,7 @@ void nilfs_segbuf_map_cont(struct nilfs_segment_buffer *segbuf,
                            struct nilfs_segment_buffer *prev);
 void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *, __u64,
                                   struct the_nilfs *);
-int nilfs_segbuf_reset(struct nilfs_segment_buffer *, unsigned, time_t);
+int nilfs_segbuf_reset(struct nilfs_segment_buffer *, unsigned, time_t, __u64);
 int nilfs_segbuf_extend_segsum(struct nilfs_segment_buffer *);
 int nilfs_segbuf_extend_payload(struct nilfs_segment_buffer *,
                                 struct buffer_head **);
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;
 
diff --git a/include/linux/nilfs2_fs.h b/include/linux/nilfs2_fs.h
index f960e1d264e8..6505c00f1fc1 100644
--- a/include/linux/nilfs2_fs.h
+++ b/include/linux/nilfs2_fs.h
@@ -377,6 +377,7 @@ union nilfs_binfo {
  * @ss_nfinfo: number of finfo structures
  * @ss_sumbytes: total size of segment summary in bytes
  * @ss_pad: padding
+ * @ss_cno: checkpoint number
  */
 struct nilfs_segment_summary {
         __le32 ss_datasum;
@@ -391,6 +392,7 @@ struct nilfs_segment_summary {
         __le32 ss_nfinfo;
         __le32 ss_sumbytes;
         __le32 ss_pad;
+        __le64 ss_cno;
         /* array of finfo structures */
 };