[Libguestfs] [PATCH v2 2/4] sparsify: support QEMU detect-zeroes in copying mode (RHBZ#1130506)

[Maros Zatko]

Fixes RHBZ#1130506
See also: https://lists.gnu.org/archive/html/qemu-devel/2012-07/msg03747.html
---
 sparsify/copying.ml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sparsify/copying.ml b/sparsify/copying.ml
index 9f788b9..111dfeb 100644
--- a/sparsify/copying.ml
+++ b/sparsify/copying.ml
@@ -190,7 +190,8 @@ You can ignore this warning or change it to a hard failure using the
     if verbose then g#set_verbose true;
 
     (* Note that the temporary overlay disk is always qcow2 format. *)
-    g#add_drive ~format:"qcow2" ~readonly:false ~cachemode:"unsafe" overlaydisk;
+    g#add_drive ~format:"qcow2" ~readonly:false ~cachemode:"unsafe" overlaydisk
+                ~detectzeros: true;
 
     if not quiet then Progress.set_up_progress_bar ~machine_readable g;
     g#launch ();
-- 
1.9.3