nilfs2: fix disorder of nilfs_write_super in nilfs_sync_fs

This fixes disorder of nilfs_write_super in nilfs_sync_fs.  Commiting
super block must be the end of the function so that every changes are
reflected.

->sync_fs() is not called frequently so this makes nilfs_sync_fs call
nilfs_commit_super instead of nilfs_write_super.

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

1 files changed, 8 insertions, 2 deletions

diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index e543eda0d939..9926a1d6d225 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -385,13 +385,19 @@ static void nilfs_write_super(struct super_block *sb)
 
 static int nilfs_sync_fs(struct super_block *sb, int wait)
 {
+        struct nilfs_sb_info *sbi = NILFS_SB(sb);
+        struct the_nilfs *nilfs = sbi->s_nilfs;
         int err = 0;
 
-        nilfs_write_super(sb);
-
         /* This function is called when super block should be written back */
         if (wait)
                 err = nilfs_construct_segment(sb);
+
+        down_write(&nilfs->ns_sem);
+        if (sb->s_dirt)
+                nilfs_commit_super(sbi, 1);
+        up_write(&nilfs->ns_sem);
+
         return err;
 }