linux-kernel - RE: [PATCH v4] 9p: retrieve fid from file when file instance exist.

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Date:   Mon, 13 Jul 2020 09:27:07 +0000
From:   Jianyong Wu <Jianyong.Wu@....com>
To:     Dominique Martinet <asmadeus@...ewreck.org>
CC:     "ericvh@...il.com" <ericvh@...il.com>,
        "lucho@...kov.net" <lucho@...kov.net>,
        "v9fs-developer@...ts.sourceforge.net" 
        <v9fs-developer@...ts.sourceforge.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Steve Capper <Steve.Capper@....com>,
        Kaly Xin <Kaly.Xin@....com>, Justin He <Justin.He@....com>,
        Wei Chen <Wei.Chen@....com>
Subject: RE: [PATCH v4] 9p: retrieve fid from file when file instance exist.



> -----Original Message-----
> From: Dominique Martinet <asmadeus@...ewreck.org>
> Sent: Friday, July 10, 2020 7:09 PM
> To: Jianyong Wu <Jianyong.Wu@....com>
> Cc: ericvh@...il.com; lucho@...kov.net; v9fs-
> developer@...ts.sourceforge.net; linux-kernel@...r.kernel.org; Steve
> Capper <Steve.Capper@....com>; Kaly Xin <Kaly.Xin@....com>; Justin He
> <Justin.He@....com>; Wei Chen <Wei.Chen@....com>
> Subject: Re: [PATCH v4] 9p: retrieve fid from file when file instance exist.
>
> Jianyong Wu wrote on Fri, Jul 10, 2020:
> > In the current setattr implementation in 9p, fid is always retrieved
> > from dentry no matter file instance exists or not. If so, there may be
> > some info related to opened file instance dropped. So it's better to
> > retrieve fid from file instance when it is passed to setattr.
> >
> > for example:
> > fd=open("tmp", O_RDWR);
> > ftruncate(fd, 10);
> >
> > The file context related with the fd will be lost as fid is always
> > retrieved from dentry, then the backend can't get the info of file
> > context. It is against the original intention of user and may lead to
> > bug.
> >
> > Signed-off-by: Jianyong Wu <jianyong.wu@....com>
> > ---
>
>
> For next time, you can add arbitrary comments (e.g. describe briefly
> differences from previous versions) after the --- line.
>
> For others, this inits fid to NULL in both functions; thanks for picking it up I'll
> refresh the patch.
>
Ok,

Thanks
Jianyong
> --
> Dominique
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