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-rw-r--r--include/block/block_int.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 84991d9973..3a24913a7e 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -295,6 +295,12 @@ struct BlockDriver {
*/
int (*bdrv_probe_geometry)(BlockDriverState *bs, HDGeometry *geo);
+ /**
+ * Drain and stop any internal sources of requests in the driver, and
+ * remain so until next I/O callback (e.g. bdrv_co_writev) is called.
+ */
+ void (*bdrv_drain)(BlockDriverState *bs);
+
QLIST_ENTRY(BlockDriver) list;
};