From 95de6d7078b029b73708059a17cef20f332adcb7 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Fri, 22 Nov 2013 13:39:50 +0100
Subject: block drivers: add discard/write_zeroes properties to bdrv_get_info
 implementation

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/qcow2.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'block/qcow2.c')

diff --git a/block/qcow2.c b/block/qcow2.c
index 8e2b6c7548..41e454a2f1 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1893,6 +1893,8 @@ static coroutine_fn int qcow2_co_flush_to_os(BlockDriverState *bs)
 static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
 {
     BDRVQcowState *s = bs->opaque;
+    bdi->unallocated_blocks_are_zero = true;
+    bdi->can_write_zeroes_with_unmap = (s->qcow_version >= 3);
     bdi->cluster_size = s->cluster_size;
     bdi->vm_state_offset = qcow2_vm_state_offset(s);
     return 0;
-- 
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