Re: [PATCH v3] blkif: reconcile protocol specification with in-use implementations

[Anthony PERARD <anthony.perard@vates.tech>]

On Thu, Sep 12, 2024 at 11:57:29AM +0200, Roger Pau Monne wrote:
>  /*
>   * Cast to this structure when blkif_request.operation == BLKIF_OP_DISCARD
>   * sizeof(struct blkif_request_discard) <= sizeof(struct blkif_request)
> + *
> + * The 'sector_number' field is in units of 512b, despite the value of the
> + * 'sector-size' xenstore node.  Note however that the offset in
> + * 'sector_number' must be aligned to 'sector-size'.

For discard request, there's "discard-granularity", and I think
`sector_number` should be aligned to it. See "discard-granularity" and
note 4.

>   */
>  struct blkif_request_discard {
>      uint8_t        operation;    /* BLKIF_OP_DISCARD                     */

Thanks,

-- 

Anthony Perard | Vates XCP-ng Developer

XCP-ng & Xen Orchestra - Vates solutions

web: https://vates.tech