vold: Add an optional wipe paramter to the volume format command

The new wipe option to the vold format command will invoke BLKDISCARD
on the partition before invoking newfs_msdos.  This will be used whenever
a full wipe of the device is wanted, as this is more secure than just
doing newfs_msdos.

Bug: 9392982
Change-Id: Ie106f1b9cc70abc61206006d1821641c27c7ccae
diff --git a/cryptfs.c b/cryptfs.c
index 1bf7049..c86e712 100644
--- a/cryptfs.c
+++ b/cryptfs.c
@@ -46,6 +46,7 @@
 #include "cutils/properties.h"
 #include "hardware_legacy/power.h"
 #include "VolumeManager.h"
+#include "VoldUtil.h"
 
 #define DM_CRYPT_BUF_SIZE 4096
 #define DATA_MNT_POINT "/data"
@@ -115,17 +116,6 @@
     return (unsigned int) (len / 512);
 }
 
-static unsigned int get_blkdev_size(int fd)
-{
-  unsigned int nr_sec;
-
-  if ( (ioctl(fd, BLKGETSIZE, &nr_sec)) == -1) {
-    nr_sec = 0;
-  }
-
-  return nr_sec;
-}
-
 static int get_crypt_ftr_info(char **metadata_fname, off64_t *off)
 {
   static int cached_data = 0;