All .bdrv_co_write_zeroes callbacks nowadays work perfectly even with backing store attached. If future new callbacks would be unable to do that - they have a chance to block this in bdrv_get_info().
Signed-off-by: Denis V. Lunev <[email protected]> Reviewed-by: Eric Blake <[email protected]> Reviewed-by: John Snow <[email protected]> Reviewed-by: Fam Zheng <[email protected]> CC: Stefan Hajnoczi <[email protected]> CC: Kevin Wolf <[email protected]> CC: Max Reitz <[email protected]> CC: Jeff Cody <[email protected]> --- block.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block.c b/block.c index 823ff1d..c2fb8bd 100644 --- a/block.c +++ b/block.c @@ -2834,7 +2834,7 @@ bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) { BlockDriverInfo bdi; - if (bs->backing || !(bs->open_flags & BDRV_O_UNMAP)) { + if (!(bs->open_flags & BDRV_O_UNMAP)) { return false; } -- 2.5.0
