btrfs: only chown_mapped_root() if not btrfs

src/lxc/bdev/bdev.c

@@ -412,12 +412,17 @@ struct bdev *bdev_copy(struct lxc_container *c0, const char *cname,
 		goto err;
 	}
 
-	if (!strcmp(new->type, "overlay") || !strcmp(new->type, "overlayfs"))
-		src_no_prefix = ovl_get_lower(new->src);
-	else
-		src_no_prefix = lxc_storage_get_path(new->src, new->type);
-	if (am_unpriv() && chown_mapped_root(src_no_prefix, c0->lxc_conf) < 0)
-		WARN("Failed to update ownership of %s", new->dest);
+	/* If the storage driver is "btrfs" then the we will create snapshot. */
+	if (strcmp(bdevtype, "btrfs")) {
+		if (!strcmp(new->type, "overlay") ||
+		    !strcmp(new->type, "overlayfs"))
+			src_no_prefix = ovl_get_lower(new->src);
+		else
+			src_no_prefix = lxc_storage_get_path(new->src, new->type);
+
+		if (am_unpriv() && chown_mapped_root(src_no_prefix, c0->lxc_conf) < 0)
+			WARN("Failed to chown \"%s\"", src_no_prefix);
+	}
 
 	if (snap)
 		return new;