Re: [PATCH 09/21] Introduce event-tap.

Marcelo Tosatti
2010-11-30T01:21:05Z

On Thu, Nov 25, 2010 at 03:06:48PM +0900, Yoshiaki Tamura wrote:
> event-tap controls when to start FT transaction, and provides proxy
> functions to called from net/block devices. While FT transaction, it
> queues up net/block requests, and flush them when the transaction gets
> completed.
>
> Signed-off-by: Yoshiaki Tamura <tamura.yoshiaki@lab.ntt.co.jp>
> Signed-off-by: OHMURA Kei <ohmura.kei@lab.ntt.co.jp>

> +static void event_tap_alloc_blk_req(EventTapBlkReq *blk_req,
> + BlockDriverState *bs, BlockRequest *reqs,
> + int num_reqs, BlockDriverCompletionFunc *cb,
> + void *opaque, bool is_multiwrite)
> +{
> + int i;
> +
> + blk_req->num_reqs = num_reqs;
> + blk_req->num_cbs = num_reqs;
> + blk_req->device_name = qemu_strdup(bs->device_name);
> + blk_req->is_multiwrite = is_multiwrite;
> +
> + for (i = 0; i < num_reqs; i++) {
> + blk_req->reqs[i].sector = reqs[i].sector;
> + blk_req->reqs[i].nb_sectors = reqs[i].nb_sectors;
> + blk_req->reqs[i].qiov = reqs[i].qiov;
> + blk_req->reqs[i].cb = cb;
> + blk_req->reqs[i].opaque = opaque;
> + blk_req->cb[i] = reqs[i].cb;
> + blk_req->opaque[i] = reqs[i].opaque;
> + }
> +}

bdrv_aio_flush should also be logged, so that guest initiated flush is
respected on replay.