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Date:   Mon, 20 Jul 2020 02:52:12 +0100
From:   Al Viro <viro@zeniv.linux.org.uk>
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@arm.com, justin.he@arm.com, wei.chen@arm.com
Subject: Re: [RFC PATCH 0/2] vfs:9p: fix open-unlink-fstat bug
Message-ID: <20200720015212.GN2786714@ZenIV.linux.org.uk>
References: <20200720014622.37364-1-jianyong.wu@arm.com>
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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 = 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?