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Re: [Qemu-devel] [RFC PATCH v2 6/8] dma: Implement .cancel_async
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [RFC PATCH v2 6/8] dma: Implement .cancel_async |
Date: |
Tue, 26 Aug 2014 10:46:36 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.7.0 |
Il 26/08/2014 08:08, Fam Zheng ha scritto:
> + if (dbs->cancelled) {
> + ret = -ECANCELED;
> + }
Why is dbs->cancelled necessary?
> dma_bdrv_unmap(dbs);
> if (dbs->common.cb) {
> dbs->common.cb(dbs->common.opaque, ret);
> @@ -141,6 +148,9 @@ static void dma_bdrv_cb(void *opaque, int ret)
>
> trace_dma_bdrv_cb(dbs, ret);
>
> + if (dbs->cancelled) {
> + ret = -ECANCELED;
> + }
> dbs->acb = NULL;
> dbs->sector_num += dbs->iov.size / 512;
>
> @@ -185,6 +195,7 @@ static void dma_aio_cancel(BlockDriverAIOCB *acb)
>
> trace_dma_aio_cancel(dbs);
>
> + dbs->cancelled = true;
> if (dbs->acb) {
> BlockDriverAIOCB *acb = dbs->acb;
> dbs->acb = NULL;
> @@ -196,9 +207,25 @@ static void dma_aio_cancel(BlockDriverAIOCB *acb)
> dma_complete(dbs, 0);
> }
>
> +static void dma_aio_cancel_async(BlockDriverAIOCB *acb)
> +{
> + DMAAIOCB *dbs = container_of(acb, DMAAIOCB, common);
> +
> + trace_dma_aio_cancel(dbs);
> +
> + dbs->cancelled = true;
> + if (dbs->acb) {
> + acb = dbs->acb;
> + dbs->acb = NULL;
Why do you need to set dbs->acb to NULL, since the callback is going to
be called?
Paolo
> + bdrv_aio_cancel_async(acb);
> + }
> +}
- [Qemu-devel] [RFC PATCH v2 0/8] block: Asynchronous request cancellation, Fam Zheng, 2014/08/26
- [Qemu-devel] [RFC PATCH v2 1/8] block: Add refcnt in BlockDriverAIOCB, Fam Zheng, 2014/08/26
- [Qemu-devel] [RFC PATCH v2 2/8] block: Add bdrv_aio_cancel_async, Fam Zheng, 2014/08/26
- [Qemu-devel] [RFC PATCH v2 3/8] tests: Add testing code for bdrv_aio_cancel_async, Fam Zheng, 2014/08/26
- [Qemu-devel] [RFC PATCH v2 4/8] linux-aio: Implement .cancel_async, Fam Zheng, 2014/08/26
- [Qemu-devel] [RFC PATCH v2 5/8] thread-pool: Implement .cancel_async, Fam Zheng, 2014/08/26
- [Qemu-devel] [RFC PATCH v2 6/8] dma: Implement .cancel_async, Fam Zheng, 2014/08/26
- Re: [Qemu-devel] [RFC PATCH v2 6/8] dma: Implement .cancel_async,
Paolo Bonzini <=
- [Qemu-devel] [RFC PATCH v2 7/8] block: Implement bdrv_em_co_aiocb_info.cancel_async, Fam Zheng, 2014/08/26
- [Qemu-devel] [RFC PATCH v2 8/8] iscsi: Implement .cancel_async in acb info, Fam Zheng, 2014/08/26