linux-kernel - Re: [PATCH v5 05/22] cachefiles: notify user daemon when withdrawing cookie

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Message-ID: <774ac783-98f8-eedb-af55-ff99eef5369c@linux.alibaba.com>
Date:   Mon, 21 Mar 2022 22:31:08 +0800
From:   JeffleXu <jefflexu@...ux.alibaba.com>
To:     David Howells <dhowells@...hat.com>
Cc:     linux-cachefs@...hat.com, xiang@...nel.org, chao@...nel.org,
        linux-erofs@...ts.ozlabs.org, torvalds@...ux-foundation.org,
        gregkh@...uxfoundation.org, willy@...radead.org,
        linux-fsdevel@...r.kernel.org, joseph.qi@...ux.alibaba.com,
        bo.liu@...ux.alibaba.com, tao.peng@...ux.alibaba.com,
        gerry@...ux.alibaba.com, eguan@...ux.alibaba.com,
        linux-kernel@...r.kernel.org, luodaowen.backend@...edance.com
Subject: Re: [PATCH v5 05/22] cachefiles: notify user daemon when withdrawing
 cookie

On 3/21/22 10:20 PM, David Howells wrote:
> Jeffle Xu <jefflexu@...ux.alibaba.com> wrote:
> 
>> Notify user daemon that cookie is going to be withdrawed, providing a
> 
> "withdrawn".

Thanks.

> 
>> +	/* CLOSE request doesn't look forward a reply */
> 
> I'm not sure what you mean.

When cookie gets withdrawn, Cachefiles will send a CLOSE request to user
daemon, telling that the associated anon_fd could be closed. But it's
just a hint. User daemon could keep the anon_fd open when it receives
the CLOSE request. After sending the CLOSE request, Cachefiles will go
on the process of withdrawing cookie and won't wait for a reply
synchronously. So CLOSE request is just a hint to user daemon, and it
doesn't need to be replied.

-- 
Thanks,
Jeffle