block: add flags to BlockRequest

This lets bdrv_co_do_rw receive flags, so that it can be used for
zero writes.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/block/block.h b/include/block/block.h
index 5beccbf1cf..49e6719116 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -311,6 +311,7 @@ typedef struct BlockRequest {
     /* Fields to be filled by multiwrite caller */
     int64_t sector;
     int nb_sectors;
+    int flags;
     QEMUIOVector *qiov;
     BlockDriverCompletionFunc *cb;
     void *opaque;