From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <ian.campbell@citrix.com>
Subject: Re: "don't bugger nd->seq" seems to break umount
 sometimes
Date: Tue, 19 May 2015 09:33:59 +0100
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To: Zefan Li <lizefan@huawei.com>
Cc: xen-tools@packages.debian.org, xen-devel@lists.xensource.com, stefano.stabellini@eu.citrix.com, Andrew Cooper <andrew.cooper3@citrix.com>, Ian Jackson <Ian.Jackson@eu.citrix.com>, Al Viro <viro@ZenIV.linux.org.uk>, Boris Ostrovsky <boris.ostrovsky@oracle.com>, David Vrabel <david.vrabel@citrix.com>
List-Id: xen-devel@lists.xenproject.org

On Thu, 2015-04-30 at 09:15 +0800, Zefan Li wrote:
> On 2015/4/29 20:21, Al Viro wrote:
> > On Wed, Apr 29, 2015 at 12:45:45PM +0100, Ian Jackson wrote:
> > 
> >> The symptoms are that `umount' fails with EBUSY,
> > 
> >     [lizf: Backported to 3.4:
> >      - remove the changes to follow_link() as it doesn't call set_root()]
> > 
> > looks dubious - I don't have -stable in front of me, but set_root() in
> > follow_link() had migrated from __vfs_follow_link(), so could you try
> > (tr '#' '\t' | ed fs/namei.c) <<'EOF'
> > /__vfs_follow_link/
> > /set_root/s/^/#/
> > i
> > ##if (!nd->root.mnt)
> > .
> > wq
> > EOF
> > and see if it helps?
> > .
> > 
> 
> My fault. I just checked 3.2.y, and it made the right change.

Is there going to be a 3.4.108 with a fix for this?

Thanks,
Ian.