On Thu, 03/24 23:33, Max Reitz wrote:
> Signed-off-by: Max Reitz <mre...@redhat.com>
> ---
> block/null.c | 22 ++++++++++++++++++++++
> 1 file changed, 22 insertions(+)
>
> diff --git a/block/null.c b/block/null.c
> index a7df386..f4b3bba 100644
> --- a/block/null.c
> +++ b/block/null.c
> @@ -204,6 +204,24 @@ static int null_reopen_prepare(BDRVReopenState
> *reopen_state,
> return 0;
> }
>
> +static int64_t coroutine_fn null_co_get_block_status(BlockDriverState *bs,
> + int64_t sector_num,
> + int nb_sectors, int
> *pnum,
> + BlockDriverState **file)
> +{
> + BDRVNullState *s = bs->opaque;
> + off_t start = sector_num * BDRV_SECTOR_SIZE;
> +
> + *pnum = nb_sectors;
> + *file = bs;
> +
> + if (s->read_zeroes) {
> + return BDRV_BLOCK_OFFSET_VALID | start | BDRV_BLOCK_ZERO;
> + } else {
> + return BDRV_BLOCK_OFFSET_VALID | start;
> + }
> +}
> +
> static BlockDriver bdrv_null_co = {
> .format_name = "null-co",
> .protocol_name = "null-co",
> @@ -217,6 +235,8 @@ static BlockDriver bdrv_null_co = {
> .bdrv_co_writev = null_co_writev,
> .bdrv_co_flush_to_disk = null_co_flush,
> .bdrv_reopen_prepare = null_reopen_prepare,
> +
> + .bdrv_co_get_block_status = null_co_get_block_status,
> };
>
> static BlockDriver bdrv_null_aio = {
> @@ -232,6 +252,8 @@ static BlockDriver bdrv_null_aio = {
> .bdrv_aio_writev = null_aio_writev,
> .bdrv_aio_flush = null_aio_flush,
> .bdrv_reopen_prepare = null_reopen_prepare,
> +
> + .bdrv_co_get_block_status = null_co_get_block_status,
> };
>
> static void bdrv_null_init(void)
> --
> 2.7.4
>
Acked-by: Fam Zheng <f...@redhat.com>
