1 files changed, 8 insertions, 1 deletions
diff --git a/include/block/block.h b/include/block/block.h
index a3f3dcc88f..a193545b6a 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -77,8 +77,15 @@ typedef enum {
      * written to qiov parameter which may be NULL.
      */
     BDRV_REQ_PREFETCH  = 0x200,
+
+    /*
+     * If we need to wait for other requests, just fail immediately. Used
+     * only together with BDRV_REQ_SERIALISING.
+     */
+    BDRV_REQ_NO_WAIT = 0x400,
+
     /* Mask of valid flags */
-    BDRV_REQ_MASK               = 0x3ff,
+    BDRV_REQ_MASK               = 0x7ff,
 } BdrvRequestFlags;
 
 typedef struct BlockSizes {