From 053061f66f79d21bb48d089717a171470e05e47e Mon Sep 17 00:00:00 2001
From: "Richard W.M. Jones" <rjones@redhat.com>
Date: Sat, 31 Aug 2013 22:38:03 +0100
Subject: [PATCH] drives: Ensure all scratch drives use cachemode "unsafe".

They are _scratch_ drives so any data on them doesn't matter and can
be reconstructed in the event of a host system crash.

(cherry picked from commit 96cd7fcecb031bfe6baa49addfb026ae988fb7c1)
---
 src/drives.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/drives.c b/src/drives.c
index 97be2ed..f310b06 100644
--- a/src/drives.c
+++ b/src/drives.c
@@ -1029,13 +1029,15 @@ int
 guestfs__add_drive_scratch (guestfs_h *g, int64_t size,
                                  const struct guestfs_add_drive_scratch_argv *optargs)
 {
-  struct guestfs_add_drive_opts_argv add_drive_optargs;
+  struct guestfs_add_drive_opts_argv add_drive_optargs = { .bitmask = 0 };
   CLEANUP_FREE char *filename = NULL;
   int fd;
 
   /* Some parameters we always set. */
-  add_drive_optargs.bitmask = GUESTFS_ADD_DRIVE_OPTS_FORMAT_BITMASK;
+  add_drive_optargs.bitmask |= GUESTFS_ADD_DRIVE_OPTS_FORMAT_BITMASK;
   add_drive_optargs.format = "raw";
+  add_drive_optargs.bitmask |= GUESTFS_ADD_DRIVE_OPTS_CACHEMODE_BITMASK;
+  add_drive_optargs.cachemode = "unsafe";
 
   /* Copy the optional arguments through to guestfs_add_drive_opts. */
   if (optargs->bitmask & GUESTFS_ADD_DRIVE_SCRATCH_NAME_BITMASK) {
-- 
1.8.3.1