netdev - Re: [PATCH v2 1/4] vsock: track pkt owner vsock

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Message-ID: <CA+a=Yy5OMDSr12S3JZ3BeMhZKAZ0DAgOuAnSPG8TDw-wr-zzsg@mail.gmail.com>
Date:   Thu, 8 Dec 2016 18:37:58 +0800
From:   Peng Tao <bergwolf@...il.com>
To:     Stefan Hajnoczi <stefanha@...il.com>
Cc:     Stefan Hajnoczi <stefanha@...hat.com>, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH v2 1/4] vsock: track pkt owner vsock

On Thu, Dec 8, 2016 at 5:30 PM, Stefan Hajnoczi <stefanha@...il.com> wrote:
> On Wed, Dec 07, 2016 at 11:14:09PM +0800, Peng Tao wrote:
>> So that we can cancel a queued pkt later if necessary.
>>
>> Signed-off-by: Peng Tao <bergwolf@...il.com>
>> ---
>>  include/linux/virtio_vsock.h            | 2 ++
>>  net/vmw_vsock/virtio_transport_common.c | 7 +++++++
>>  2 files changed, 9 insertions(+)
>>
>> diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
>> index 9638bfe..6dd3242 100644
>> --- a/include/linux/virtio_vsock.h
>> +++ b/include/linux/virtio_vsock.h
>> @@ -48,6 +48,7 @@ struct virtio_vsock_pkt {
>>       struct virtio_vsock_hdr hdr;
>>       struct work_struct work;
>>       struct list_head list;
>> +     struct vsock_sock *vsk;
>
> To prevent future bugs, please add a comment here:
> /* socket refcnt not held, only use for cancellation */
>
> This field is just an opaque token used for cancellation rather than a
> struct vsock_sock pointer that we are allowed to dereference.  You could
> change this field to void *cancel_token to make the code harder to
> misuse.
Will do. Thanks!

Cheers,
Tao