Am 03.06.2016 um 19:03 hat Eric Blake geschrieben:
> Sector-based limits are awkward to think about; in our on-going
> quest to move to byte-based interfaces, convert max_discard and
> discard_alignment. Rename them, using 'pdiscard' as an aid to
> track which remaining discard interfaces need conversion, and so
> that the compiler will help us catch the change in semantics
> across any rebased code. In iscsi.c, sector_limits_lun2qemu()
> is no longer needed; and the BlockLimits type is now completely
> byte-based.
>
> Signed-off-by: Eric Blake <ebl...@redhat.com>
> diff --git a/block/nbd.c b/block/nbd.c
> index 2ce7b4d..a3de9bc 100644
> --- a/block/nbd.c
> +++ b/block/nbd.c
> @@ -362,7 +362,7 @@ static int nbd_co_flush(BlockDriverState *bs)
>
> static void nbd_refresh_limits(BlockDriverState *bs, Error **errp)
> {
> - bs->bl.max_discard = UINT32_MAX >> BDRV_SECTOR_BITS;
> + bs->bl.max_pdiscard = INT32_MAX;
> bs->bl.max_transfer = NBD_MAX_BUFFER_SIZE;
> }
Another non-mechanical change that might deserve its own patch (or
probably one NBD patch that changes both values).
Kevin
