Add must_be_container helper.

[thirdparty/mdadm.git] / util.c

diff --git a/util.c b/util.c
index f744cdbe1ac9ba5aa33cda6c3bd998b7856599cb..ac5d8b137822583569fa415f486497b5c874a88c 100644 (file)
--- a/util.c
+++ b/util.c
@@ -1189,6 +1189,20 @@ int get_dev_size(int fd, char *dname, unsigned long long *sizep)
        return 1;
 }
 
+/* Return true if this can only be a container, not a member device.
+ * i.e. is and md device and size is zero
+ */
+int must_be_container(int fd)
+{
+       unsigned long long size;
+       if (md_get_version(fd) < 0)
+               return 0;
+       if (get_dev_size(fd, NULL, &size) == 0)
+               return 1;
+       if (size == 0)
+               return 1;
+       return 0;
+}
 
 /* Sets endofpart parameter to the last block used by the last GPT partition on the device.
  * Returns: 1 if successful