block: add new BlockDriver handler: bdrv_cancel_in_flight

It will be used to stop retrying NBD requests on mirror cancel.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20210205163720.887197-2-vsementsov@virtuozzo.com>
Signed-off-by: Eric Blake <eblake@redhat.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/block/io.c b/block/io.c
index b0435ed..ca2dca3 100644
--- a/block/io.c
+++ b/block/io.c
@@ -3460,3 +3460,14 @@ out:
 
     return ret;
 }
+
+void bdrv_cancel_in_flight(BlockDriverState *bs)
+{
+    if (!bs || !bs->drv) {
+        return;
+    }
+
+    if (bs->drv->bdrv_cancel_in_flight) {
+        bs->drv->bdrv_cancel_in_flight(bs);
+    }
+}