RE: [RFC PATCH 0/2] vfs:9p: fix open-unlink-fstat bug

[Jianyong Wu]

> -----Original Message-----
> From: Al Viro <viro@xxxxxxxxxxxxxxxx> On Behalf Of Al Viro
> Sent: Monday, July 20, 2020 9:52 AM
> To: Jianyong Wu <Jianyong.Wu@xxxxxxx>
> Cc: ericvh@xxxxxxxxx; hch@xxxxxx; dhowells@xxxxxxxxxx;
> lucho@xxxxxxxxxx; asmadeus@xxxxxxxxxxxxx; v9fs-
> developer@xxxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Kaly Xin
> <Kaly.Xin@xxxxxxx>; Justin He <Justin.He@xxxxxxx>; Wei Chen
> <Wei.Chen@xxxxxxx>
> 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 = 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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