From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Date: Tue, 18 Jun 2019 14:08:04 +0000 (+0300)
Subject: blockdev: enable non-root nodes for transaction drive-backup source
X-Git-Tag: qemu-xen-4.13.0-rc1~111^2~6
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=85c9d133fb53ff098505ad03f139a3f4c99be863;p=qemu-xen.git

blockdev: enable non-root nodes for transaction drive-backup source

We forget to enable it for transaction .prepare, while it is already
enabled in do_drive_backup since commit a2d665c1bc362
    "blockdev: loosen restrictions on drive-backup source node"

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 20190618140804.59214-1-vsementsov@virtuozzo.com
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
---

diff --git a/blockdev.c b/blockdev.c
index 5d6a13dea9..4d141e9a1f 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1774,7 +1774,7 @@ static void drive_backup_prepare(BlkActionState *common, Error **errp)
     assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
     backup = common->action->u.drive_backup.data;
 
-    bs = qmp_get_root_bs(backup->device, errp);
+    bs = bdrv_lookup_bs(backup->device, backup->device, errp);
     if (!bs) {
         return;
     }