linux-kernel - RE: [V9fs-developer] [PATCH RFC 4/4] 9p: fix race issue in fid contention.

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Date:   Mon, 14 Sep 2020 07:50:34 +0000
From:   Jianyong Wu <Jianyong.Wu@....com>
To:     Dominique Martinet <asmadeus@...ewreck.org>
CC:     "lucho@...kov.net" <lucho@...kov.net>,
        Justin He <Justin.He@....com>,
        "ericvh@...il.com" <ericvh@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "v9fs-developer@...ts.sourceforge.net" 
        <v9fs-developer@...ts.sourceforge.net>, Greg Kurz <groug@...d.org>
Subject: RE: [V9fs-developer] [PATCH RFC 4/4] 9p: fix race issue in fid
 contention.

Hi Dominique,

> -----Original Message-----
> From: Dominique Martinet <asmadeus@...ewreck.org>
> Sent: Monday, September 14, 2020 2:32 PM
> To: Jianyong Wu <Jianyong.Wu@....com>
> Cc: lucho@...kov.net; Justin He <Justin.He@....com>; ericvh@...il.com;
> linux-kernel@...r.kernel.org; v9fs-developer@...ts.sourceforge.net; Greg
> Kurz <groug@...d.org>
> Subject: Re: [V9fs-developer] [PATCH RFC 4/4] 9p: fix race issue in fid
> contention.
>
> Dominique Martinet wrote on Mon, Sep 14, 2020:
> > Jianyong Wu wrote on Mon, Sep 14, 2020:
> >  - Ideally base yourself of my 9p-test branch to have async clunk:
> > https://github.com/martinetd/linux/commits/9p-test
> > I've been promising to push it to next this week™ for a couple of
> > weeks but if something is based on it I won't be able to delay this
> > much longer, it'll get pushed to 5.10 cycle anyway.
> > (I'll resend the patches to be clean)
> >
> >> tests:
> >> race issue test from the old test case:
> >> for file in {01..50}; do touch f.${file}; done seq 1 1000 | xargs -n
> >> 1 -P 50 -I{} cat f.* > /dev/null
>
> hmpf, so that made me insist a bit on this test on my patch and I see a
> problem with that as well. The me from a few years ago was good!
>
> With that said I'll want to work a bit more on this, so feel free to base off
> master and I'll deal with rebase if required.
>
> Part of me thinks it's the same bug that will be fixed with refcounting and I
> just made it easier to hit, but I'm honestly unsure at this point and testing
> would basically mean I just code what I asked you to...
>
> Well, let me know if you want me to do the refcounting, but I'd rather let you
> finish what you started.

Thanks, I'm happy to work this.
>If possible put the patch first in the series so commits
> can be tested independently.

Ah, this patch depends on the previous patches, how can I put it as the first of the series?

Thanks
Jianyong

> Thanks,
> --
> Dominique
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