From 8ee79e707a005c9274df7ce34265bb7d008b8cef Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Wed, 4 Jun 2014 15:09:35 +0200
Subject: block: Catch backing files assigned to non-COW drivers

Since we parse backing.* options to add a backing file from the command
line when the driver didn't assign one, it has been possible to have a
backing file for e.g. raw images (it just was never accessed).

This is obvious nonsense and should be rejected.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
 block/qed.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'block/qed.c')

diff --git a/block/qed.c b/block/qed.c
index 092e6fb1d2..eddae929eb 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -1652,6 +1652,7 @@ static BlockDriver bdrv_qed = {
     .format_name              = "qed",
     .instance_size            = sizeof(BDRVQEDState),
     .create_opts              = &qed_create_opts,
+    .supports_backing         = true,
 
     .bdrv_probe               = bdrv_qed_probe,
     .bdrv_rebind              = bdrv_qed_rebind,
-- 
cgit v1.2.1