ovl: make path-type a bitmap
OVL_PATH_PURE_UPPER -> __OVL_PATH_UPPER | __OVL_PATH_PURE
OVL_PATH_UPPER -> __OVL_PATH_UPPER
OVL_PATH_MERGE -> __OVL_PATH_UPPER | __OVL_PATH_MERGE
OVL_PATH_LOWER -> 0
Multiple R/O layers will allow __OVL_PATH_MERGE without __OVL_PATH_UPPER.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index ea10a871..a5bfd60 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -385,7 +385,7 @@
struct kstat stat;
enum ovl_path_type type = ovl_path_type(dentry);
- if (type != OVL_PATH_LOWER)
+ if (OVL_TYPE_UPPER(type))
break;
next = dget(dentry);
@@ -394,7 +394,7 @@
parent = dget_parent(next);
type = ovl_path_type(parent);
- if (type != OVL_PATH_LOWER)
+ if (OVL_TYPE_UPPER(type))
break;
dput(next);