On Tue, Sep 24, 2013 at 03:35:02PM +0200, Peter Lieven wrote:
> @@ -4245,7 +4250,37 @@ int coroutine_fn bdrv_co_discard(BlockDriverState *bs,
> int64_t sector_num,
> }
>
> if (bs->drv->bdrv_co_discard) {
> - return bs->drv->bdrv_co_discard(bs, sector_num, nb_sectors);
> + int max_discard = bs->bl.max_discard ?
> + bs->bl.max_discard : MAX_DISCARD_DEFAULT;
> +
> + while (nb_sectors > 0) {
> + int ret;
> + int num = nb_sectors;
> +
> + /* align request */
> + if (bs->bl.discard_alignment &&
> + num >= bs->bl.discard_alignment &&
> + sector_num % bs->bl.discard_alignment) {
> + if (num > bs->bl.discard_alignment) {
> + num = bs->bl.discard_alignment;
> + }
> + num -= sector_num % bs->bl.discard_alignment;
> + }
Is it always possible to discard at arbitrary sector offsets?
