nilfs2: separate function that updates log position

This moves out section that updates information of the recent log
position stored in super blocks from nilfs_commit_super to a new
routine named nilfs_set_log_cursor.

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

2 files changed, 19 insertions, 13 deletions

diff --git a/fs/nilfs2/nilfs.h b/fs/nilfs2/nilfs.h
index 469541711a1f..6718616183b7 100644
--- a/fs/nilfs2/nilfs.h
+++ b/fs/nilfs2/nilfs.h
@@ -270,6 +270,8 @@ extern struct nilfs_super_block *
 nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **);
 extern int nilfs_store_magic_and_option(struct super_block *,
                                         struct nilfs_super_block *, char *);
+extern void nilfs_set_log_cursor(struct nilfs_super_block *,
+                                 struct the_nilfs *);
 extern int nilfs_commit_super(struct nilfs_sb_info *, int);
 extern int nilfs_cleanup_super(struct nilfs_sb_info *);
 extern int nilfs_attach_checkpoint(struct nilfs_sb_info *, __u64);
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 4a85dfb70b8e..c5328c8ba1d2 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -237,13 +237,27 @@ static int nilfs_sync_super(struct nilfs_sb_info *sbi, int dupsb)
         return err;
 }
 
+void nilfs_set_log_cursor(struct nilfs_super_block *sbp,
+                          struct the_nilfs *nilfs)
+{
+        sector_t nfreeblocks;
+
+        /* nilfs->ns_sem must be locked by the caller. */
+        nilfs_count_free_blocks(nilfs, &nfreeblocks);
+        sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks);
+
+        spin_lock(&nilfs->ns_last_segment_lock);
+        sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq);
+        sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg);
+        sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno);
+        spin_unlock(&nilfs->ns_last_segment_lock);
+}
+
 int nilfs_commit_super(struct nilfs_sb_info *sbi, int dupsb)
 {
         struct the_nilfs *nilfs = sbi->s_nilfs;
         struct nilfs_super_block **sbp = nilfs->ns_sbp;
-        sector_t nfreeblocks;
         time_t t;
-        int err;
 
         /* nilfs->sem must be locked by the caller. */
         if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) {
@@ -255,20 +269,10 @@ int nilfs_commit_super(struct nilfs_sb_info *sbi, int dupsb)
                         return -EIO;
                 }
         }
-        err = nilfs_count_free_blocks(nilfs, &nfreeblocks);
-        if (unlikely(err)) {
-                printk(KERN_ERR "NILFS: failed to count free blocks\n");
-                return err;
-        }
-        spin_lock(&nilfs->ns_last_segment_lock);
-        sbp[0]->s_last_seq = cpu_to_le64(nilfs->ns_last_seq);
-        sbp[0]->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg);
-        sbp[0]->s_last_cno = cpu_to_le64(nilfs->ns_last_cno);
-        spin_unlock(&nilfs->ns_last_segment_lock);
+        nilfs_set_log_cursor(sbp[0], nilfs);
 
         t = get_seconds();
         nilfs->ns_sbwtime[0] = t;
-        sbp[0]->s_free_blocks_count = cpu_to_le64(nfreeblocks);
         sbp[0]->s_wtime = cpu_to_le64(t);
         sbp[0]->s_sum = 0;
         sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed,