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From:   Jianyong Wu <Jianyong.Wu@arm.com>
To:     Al Viro <viro@zeniv.linux.org.uk>
CC:     "ericvh@gmail.com" <ericvh@gmail.com>, "hch@lst.de" <hch@lst.de>,
        "dhowells@redhat.com" <dhowells@redhat.com>,
        "lucho@ionkov.net" <lucho@ionkov.net>,
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        <v9fs-developer@lists.sourceforge.net>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Kaly Xin <Kaly.Xin@arm.com>, Justin He <Justin.He@arm.com>,
        Wei Chen <Wei.Chen@arm.com>
Subject: RE: [RFC PATCH 0/2] vfs:9p: fix open-unlink-fstat bug
Thread-Topic: [RFC PATCH 0/2] vfs:9p: fix open-unlink-fstat bug
Thread-Index: AQHWXjefI/dFRQ8uiE2cxP7P59J4UakPtFYAgAABSbA=
Date:   Mon, 20 Jul 2020 01:58:15 +0000
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> -----Original Message-----
> From: Al Viro <viro@ftp.linux.org.uk> On Behalf Of Al Viro
> Sent: Monday, July 20, 2020 9:52 AM
> To: Jianyong Wu <Jianyong.Wu@arm.com>
> Cc: ericvh@gmail.com; hch@lst.de; dhowells@redhat.com;
> lucho@ionkov.net; asmadeus@codewreck.org; v9fs-
> developer@lists.sourceforge.net; linux-kernel@vger.kernel.org; Kaly Xin
> <Kaly.Xin@arm.com>; Justin He <Justin.He@arm.com>; Wei Chen
> <Wei.Chen@arm.com>
> Subject: Re: [RFC PATCH 0/2] vfs:9p: fix open-unlink-fstat bug
>
> On Mon, Jul 20, 2020 at 09:46:20AM +0800, Jianyong Wu wrote:
> > how to reproduce:
> > in 9p guest:
> >
> > struct stat *statbuf;
> > int fd;
> >
> > fd =3D open("tmp", O_RDWR);
> > unlink("tmp");
> > fstat(fd, statbuf);
> >
> > fstat will fail as "tmp" in 9p server side has been removed. 9p server
> > can't retrieve the file context as the guest has not passed it down.
> > so we should pass the file info down in 9p guest in getattr op.
> > it need add a new file member in "struct kstat" as "struct istat" does.
>
> Er... what struct istat?
Oh, sorry, I make mistake here. it's "struct iattr" Not "istat".

Thanks
Jianyong
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