Re: [Qemu-devel] [PATCH 1/5] block: add discard support

[Stefan Hajnoczi]

On Thu, Nov 25, 2010 at 1:57 PM, Christoph Hellwig <address@hidden> wrote:
> +int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors)
> +{
> +    if (!bs->drv || !bs->drv->bdrv_discard)
> +        return 0;

!bs->drv is normally -ENOMEDIUM.  Perhaps we shouldn't lump it in with
!bs->drv->bdrv_discard.

Stefan