Btrfs: skip adding an acl attribute if we don't have to

If the acl can be exactly represented in the traditional file
mode permission bits, we don't set another acl attribute.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

diff --git a/fs/btrfs/acl.c b/fs/btrfs/acl.c
index 0c16e3dbfd5681ea67d4cf2f349cb33083a46d2d..e15d2b0d8d3b20f3085c18348e9d711682fedc24 100644 (file)
--- a/fs/btrfs/acl.c
+++ b/fs/btrfs/acl.c
@@ -121,6 +121,8 @@ static int btrfs_set_acl(struct btrfs_trans_handle *trans,
                        ret = posix_acl_equiv_mode(acl, &inode->i_mode);
                        if (ret < 0)
                                return ret;
+                       if (ret == 0)
+                               acl = NULL;
                }
                ret = 0;
                break;