linux-kernel - RE: [V9fs-developer] [PATCH RFC 0/4] 9p: fix open-unlink-f*syscall bug

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Date:   Mon, 14 Sep 2020 12:36:57 +0000
From:   Jianyong Wu <Jianyong.Wu@....com>
To:     Greg Kurz <groug@...d.org>
CC:     "ericvh@...il.com" <ericvh@...il.com>,
        "lucho@...kov.net" <lucho@...kov.net>,
        "asmadeus@...ewreck.org" <asmadeus@...ewreck.org>,
        "v9fs-developer@...ts.sourceforge.net" 
        <v9fs-developer@...ts.sourceforge.net>,
        Justin He <Justin.He@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Christian Schoenebeck <qemu_oss@...debyte.com>
Subject: RE: [V9fs-developer] [PATCH RFC 0/4] 9p: fix open-unlink-f*syscall
 bug



> -----Original Message-----
> From: Greg Kurz <groug@...d.org>
> Sent: Monday, September 14, 2020 4:36 PM
> To: Jianyong Wu <Jianyong.Wu@....com>
> Cc: ericvh@...il.com; lucho@...kov.net; asmadeus@...ewreck.org; v9fs-
> developer@...ts.sourceforge.net; Justin He <Justin.He@....com>; linux-
> kernel@...r.kernel.org; Christian Schoenebeck
> <qemu_oss@...debyte.com>
> Subject: Re: [V9fs-developer] [PATCH RFC 0/4] 9p: fix open-unlink-f*syscall
> bug
>
> On Mon, 14 Sep 2020 11:37:50 +0800
> Jianyong Wu <jianyong.wu@....com> wrote:
>
> > open-unlink-f*syscall bug is a well-known bug in 9p, we try to fix the
> > bug in this patch set.
> > I take Eric's and Greg's patches which constiute the 1/4 - 3/4 of this
> > patch set as the main frame of the solution. In patch 4/4, I fix the
> > fid race issue exists in Greg's patch.
> >
>
> IIRC some patches were needed on the QEMU side as well... I'm spending
> less time on 9pfs in QEMU, so Cc'ing the new maintainer:
>
> Christian Schoenebeck <qemu_oss@...debyte.com>
>
Ok, very kind of you.

Thanks
Jianyong
> > Eric Van Hensbergen (1):
> >   fs/9p: fix create-unlink-getattr idiom
> >
> > Greg Kurz (1):
> >   fs/9p: search open fids first
> >
> > Jianyong Wu (2):
> >   fs/9p: track open fids
> >   9p: fix race issue in fid contention.
> >
> >  fs/9p/fid.c             | 72 +++++++++++++++++++++++++++++++++++------
> >  fs/9p/fid.h             | 25 +++++++++++---
> >  fs/9p/vfs_dentry.c      |  2 +-
> >  fs/9p/vfs_dir.c         | 20 ++++++++++--
> >  fs/9p/vfs_file.c        |  3 +-
> >  fs/9p/vfs_inode.c       | 52 +++++++++++++++++++++--------
> >  fs/9p/vfs_inode_dotl.c  | 44 ++++++++++++++++---------
> >  fs/9p/vfs_super.c       |  7 ++--
> >  fs/9p/xattr.c           | 18 ++++++++---
> >  include/net/9p/client.h |  8 +++++
> >  net/9p/client.c         |  7 +++-
> >  11 files changed, 206 insertions(+), 52 deletions(-)
> >

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