block: Add return value for bdrv_flush_all()

bdrv_flush() can fail, and bdrv_flush_all() should return an error as
well if this happens for a block device. It returns the first error
return now, but still at least tries to flush the remaining devices even
in error cases.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/block/block.h b/include/block/block.h
index eeb48162af..b6b9014a9c 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -267,7 +267,7 @@ void bdrv_clear_incoming_migration_all(void);
 /* Ensure contents are flushed to disk.  */
 int bdrv_flush(BlockDriverState *bs);
 int coroutine_fn bdrv_co_flush(BlockDriverState *bs);
-void bdrv_flush_all(void);
+int bdrv_flush_all(void);
 void bdrv_close_all(void);
 void bdrv_drain_all(void);