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authorPavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>2016-03-14 10:44:53 +0300
committerKevin Wolf <kwolf@redhat.com>2016-03-30 12:12:15 +0200
commitc32b82afaf261ebb922269e2be298e05331b875c (patch)
treef5d79b9fa15f7919b2361284fd42d3d83e3f7b94 /include/block
parent6278ae035fbd4bbab6a43cd53e4bf3bb71debc71 (diff)
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 <pavel.dovgaluk@ispras.ru> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'include/block')
-rw-r--r--include/block/block_int.h7
1 files changed, 7 insertions, 0 deletions
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
@@ -176,6 +176,13 @@ struct BlockDriver {
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()).
*/