From c32b82afaf261ebb922269e2be298e05331b875c Mon Sep 17 00:00:00 2001 From: Pavel Dovgalyuk Date: Mon, 14 Mar 2016 10:44:53 +0300 Subject: block: add flush callback This patch adds callback for flush request. This callback is responsible for flushing whole block devices stack. bdrv_flush function does not proceed to underlying devices. It should be performed by this callback function, if needed. Signed-off-by: Pavel Dovgalyuk Signed-off-by: Kevin Wolf --- include/block/block_int.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'include/block') diff --git a/include/block/block_int.h b/include/block/block_int.h index a33b0de40b..1177c25aab 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -175,6 +175,13 @@ struct BlockDriver { void (*bdrv_invalidate_cache)(BlockDriverState *bs, Error **errp); int (*bdrv_inactivate)(BlockDriverState *bs); + /* + * Flushes all data for all layers by calling bdrv_co_flush for underlying + * layers, if needed. This function is needed for deterministic + * synchronization of the flush finishing callback. + */ + int coroutine_fn (*bdrv_co_flush)(BlockDriverState *bs); + /* * Flushes all data that was already written to the OS all the way down to * the disk (for example raw-posix calls fsync()). -- cgit v1.2.3-55-g7522