block: enable in_use flag

Set block device in use during block migration, disallow drive_del and
bdrv_truncate for in use devices.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/blockdev.c b/blockdev.c
index f2a00bd214..ecfadc138f 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -726,6 +726,10 @@ int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
         qerror_report(QERR_DEVICE_NOT_FOUND, id);
         return -1;
     }
+    if (bdrv_in_use(bs)) {
+        qerror_report(QERR_DEVICE_IN_USE, id);
+        return -1;
+    }
 
     /* quiesce block driver; prevent further io */
     qemu_aio_flush();