linux-kernel - Re: [PATCH 2/2] 9p: read only once on O

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Date:   Wed, 5 Feb 2020 08:41:44 +0100
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     Sergey Alirzaev <l29ah@...k.li>
Cc:     v9fs-developer@...ts.sourceforge.net,
        Eric Van Hensbergen <ericvh@...il.com>,
        Latchesar Ionkov <lucho@...kov.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] 9p: read only once on O_NONBLOCK

Sergey Alirzaev wrote on Wed, Feb 05, 2020:
> A proper way to handle O_NONBLOCK would be making the requests and
> responses happen asynchronously, but this would require serious code
> refactoring.

FWIW I do have some async 9p code waiting (it's been sent to the list
ages ago but I never took the time to properly test it due to lack of
interest manifested), the problem here is more the caching model than a
synchronous issue, since in nocache mode (where this is used) there is
nowhere to fetch the data ahead of time.

If you're interested in that then please have a look at
https://lore.kernel.org/lkml/1544532108-21689-1-git-send-email-asmadeus@codewreck.org/

> Signed-off-by: Sergey Alirzaev <l29ah@...k.li>

That aside, I guess, why not?
Will take when other patch gets addressed.

Thanks,
-- 
Dominique