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>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index ea10a8719107..a5bfd60f4f6f 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -385,7 +385,7 @@ int ovl_copy_up(struct dentry *dentry)
                 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 @@ int ovl_copy_up(struct dentry *dentry)
                         parent = dget_parent(next);
 
                         type = ovl_path_type(parent);
-                        if (type != OVL_PATH_LOWER)
+                        if (OVL_TYPE_UPPER(type))
                                 break;
 
                         dput(next);