mirror: make sectors_in_flight int64_t

We keep here the sum of int fields. Thus this could easily overflow,
especially when we will start sending big requests in next patches.
Signed-off-by: NDenis V. Lunev <den@openvz.org>
Reviewed-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Reviewed-by: NJohn Snow <jsnow@redhat.com>
Reviewed-by: NFam Zheng <famz@redhat.com>
Message-id: 1468503209-19498-3-git-send-email-den@openvz.org
CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: Kevin Wolf <kwolf@redhat.com>
CC: Max Reitz <mreitz@redhat.com>
CC: Jeff Cody <jcody@redhat.com>
Signed-off-by: NJeff Cody <jcody@redhat.com>

block/mirror.c

@@ -60,7 +60,7 @@ typedef struct MirrorBlockJob {
 
     unsigned long *in_flight_bitmap;
     int in_flight;
-    int sectors_in_flight;
+    int64_t sectors_in_flight;
     int ret;
     bool unmap;
     bool waiting_for_io;