linux-kernel - Re: [PATCH 0/2] Fix /proc/sys/fs/nfs/nsm_use

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Date:   Mon, 9 Aug 2021 17:50:17 +0000
From:   Chuck Lever III <chuck.lever@...cle.com>
To:     Thomas Huth <thuth@...hat.com>
CC:     LKML <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
        Bruce Fields <bfields@...ldses.org>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        Jia He <hejianet@...il.com>,
        Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>
Subject: Re: [PATCH 0/2] Fix /proc/sys/fs/nfs/nsm_use_hostnames on big endian
 machines



> On Aug 3, 2021, at 6:59 AM, Thomas Huth <thuth@...hat.com> wrote:
> 
> There is an endianess problem with /proc/sys/fs/nfs/nsm_use_hostnames
> (which can e.g. be seen on an s390x host) :
> 
> # modprobe lockd nsm_use_hostnames=1
> # cat /proc/sys/fs/nfs/nsm_use_hostnames
> 16777216
> 
> The nsm_use_hostnames variable is declared as "bool" which is required
> for the correct type for the module parameter. However, this does not
> work correctly with the entry in the /proc filesystem since this
> currently requires "int".
> 
> Jia He already provided patches for this problem a couple of years ago,
> but apparently they felt through the cracks and never got merged. So
> here's a rebased version to finally fix this issue.
> 
> Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1764075
> 
> Jia He (2):
>  sysctl: introduce new proc handler proc_dobool
>  lockd: change the proc_handler for nsm_use_hostnames
> 
> fs/lockd/svc.c         |  2 +-
> include/linux/sysctl.h |  2 ++
> kernel/sysctl.c        | 42 ++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 45 insertions(+), 1 deletion(-)
> 
> -- 
> 2.27.0

To get these patches in front of our zero-day apparatus,
I've applied them to the for-next topic branch here:

https://git.kernel.org/pub/scm/linux/kernel/git/cel/linux.git/log/?h=for-next

However I haven't seen an Ack for the kernel/sysctl.c change yet.


--
Chuck Lever