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Re: [PATCH 2/2] hw/block/nvme: drain namespaces on sq deletion
From: |
Minwoo Im |
Subject: |
Re: [PATCH 2/2] hw/block/nvme: drain namespaces on sq deletion |
Date: |
Fri, 9 Apr 2021 20:09:54 +0900 |
User-agent: |
Mutt/1.11.4 (2019-03-13) |
On 21-04-08 21:37:09, Klaus Jensen wrote:
> From: Klaus Jensen <k.jensen@samsung.com>
>
> For most commands, when issuing an AIO, the BlockAIOCB is stored in the
> NvmeRequest aiocb pointer when the AIO is issued. The main use of this
> is cancelling AIOs when deleting submission queues (it is currently not
> used for Abort).
>
> However, some commands like Dataset Management Zone Management Send
> (zone reset) may involve more than one AIO and here the AIOs are issued
> without saving a reference to the BlockAIOCB. This is a problem since
> nvme_del_sq() will attempt to cancel outstanding AIOs, potentially with
> an invalid BlockAIOCB since the aiocb pointer is not NULL'ed when the
> request structure is recycled.
>
> Fix this by
>
> 1. making sure the aiocb pointer is NULL'ed when requests are recycled
> 2. only attempt to cancel the AIO if the aiocb is non-NULL
> 3. if any AIOs could not be cancelled, drain all aio as a last resort.
>
> Fixes: dc04d25e2f3f ("hw/block/nvme: add support for the format nvm command")
> Fixes: c94973288cd9 ("hw/block/nvme: add broadcast nsid support flush
> command")
> Fixes: e4e430b3d6ba ("hw/block/nvme: add simple copy command")
> Fixes: 5f5dc4c6a942 ("hw/block/nvme: zero out zones on reset")
> Fixes: 2605257a26b8 ("hw/block/nvme: add the dataset management command")
> Cc: Gollu Appalanaidu <anaidu.gollu@samsung.com>
> Cc: Minwoo Im <minwoo.im@samsung.com>
> Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
> ---
> hw/block/nvme.c | 23 +++++++++++++++++++++--
> 1 file changed, 21 insertions(+), 2 deletions(-)
>
> diff --git a/hw/block/nvme.c b/hw/block/nvme.c
> index 94bc373260be..3c4297e38a52 100644
> --- a/hw/block/nvme.c
> +++ b/hw/block/nvme.c
> @@ -470,6 +470,7 @@ static void nvme_req_clear(NvmeRequest *req)
> {
> req->ns = NULL;
> req->opaque = NULL;
> + req->aiocb = NULL;
> memset(&req->cqe, 0x0, sizeof(req->cqe));
> req->status = NVME_SUCCESS;
> }
> @@ -3681,6 +3682,7 @@ static uint16_t nvme_del_sq(NvmeCtrl *n, NvmeRequest
> *req)
> NvmeSQueue *sq;
> NvmeCQueue *cq;
> uint16_t qid = le16_to_cpu(c->qid);
> + int nsid;
Even we don't have fully supported number of namespaces in this device
(0xFFFFFFFF), can we have this one with `uint32_t` ?
Otherwise, looks good to me.
Reviewed-by: Minwoo Im <minwoo.im.dev@gmail.com>