@@ -271,8 +271,7 @@ static int ovl_sync_fs(struct super_block *sb, int wait)
* Not called for sync(2) call or an emergency sync (SB_I_SKIP_SYNC).
* All the super blocks will be iterated, including upper_sb.
*
- * If this is a syncfs(2) call, then we do need to call
- * sync_filesystem() on upper_sb, but enough if we do it when being
+ * If this is a syncfs(2) call, it will be enough we do it when being
* called with wait == 1.
*/
if (!wait)
@@ -281,7 +280,10 @@ static int ovl_sync_fs(struct super_block *sb, int wait)
upper_sb = ovl_upper_mnt(ofs)->mnt_sb;
down_read(&upper_sb->s_umount);
- ret = sync_filesystem(upper_sb);
+ if (upper_sb->s_op->sync_fs)
+ ret = upper_sb->s_op->sync_fs(upper_sb, wait);
+ if (!ret)
+ ret = sync_blockdev(upper_sb->s_bdev);
up_read(&upper_sb->s_umount);
return ret;
Now overlayfs can only sync dirty inode during syncfs, so remove unnecessary sync_filesystem() on upper file system. Signed-off-by: Chengguang Xu <cgxu519@mykernel.net> --- fs/overlayfs/super.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)