ovl: get rid of PURE type

The remainging uses of __OVL_PATH_PURE can be replaced by
ovl_dentry_is_opaque().
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

fs/overlayfs/dir.c

@@ -803,10 +803,7 @@ static int ovl_rename(struct inode *olddir, struct dentry *old,
 		if (!overwrite && OVL_TYPE_MERGE_OR_LOWER(new_type) && new_is_dir)
 			goto out;
 	} else {
-		if (ovl_dentry_is_opaque(new))
-			new_type = __OVL_PATH_UPPER;
-		else
-			new_type = __OVL_PATH_UPPER | __OVL_PATH_PURE;
+		new_type = __OVL_PATH_UPPER;
 	}
 
 	err = ovl_want_write(old);
@@ -826,8 +823,8 @@ static int ovl_rename(struct inode *olddir, struct dentry *old,
 			goto out_drop_write;
 	}
 
-	old_opaque = !OVL_TYPE_PURE_UPPER(old_type);
-	new_opaque = !OVL_TYPE_PURE_UPPER(new_type);
+	old_opaque = ovl_dentry_is_opaque(old);
+	new_opaque = ovl_dentry_is_opaque(new);
 
 	old_cred = ovl_override_creds(old->d_sb);
 

fs/overlayfs/overlayfs.h

@@ -12,14 +12,12 @@
 struct ovl_entry;
 
 enum ovl_path_type {
-	__OVL_PATH_PURE		= (1 << 0),
-	__OVL_PATH_UPPER	= (1 << 1),
-	__OVL_PATH_MERGE	= (1 << 2),
+	__OVL_PATH_UPPER	= (1 << 0),
+	__OVL_PATH_MERGE	= (1 << 1),
 };
 
 #define OVL_TYPE_UPPER(type)	((type) & __OVL_PATH_UPPER)
 #define OVL_TYPE_MERGE(type)	((type) & __OVL_PATH_MERGE)
-#define OVL_TYPE_PURE_UPPER(type) ((type) & __OVL_PATH_PURE)
 #define OVL_TYPE_MERGE_OR_LOWER(type) \
 	(OVL_TYPE_MERGE(type) || !OVL_TYPE_UPPER(type))
 

fs/overlayfs/super.c

@@ -80,12 +80,10 @@ enum ovl_path_type ovl_path_type(struct dentry *dentry)
 
 		/*
 		 * Non-dir dentry can hold lower dentry from previous
-		 * location. Its purity depends only on opaque flag.
+		 * location.
 		 */
 		if (oe->numlower && S_ISDIR(dentry->d_inode->i_mode))
 			type |= __OVL_PATH_MERGE;
-		else if (!oe->opaque)
-			type |= __OVL_PATH_PURE;
 	} else {
 		if (oe->numlower > 1)
 			type |= __OVL_PATH_MERGE;