linux-kernel - Re: [PATCH] cifs: remove the sockopt= mount option

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Date:	Wed, 6 Mar 2013 08:40:04 -0500
From:	Jeff Layton <jlayton@...hat.com>
To:	Steve French <smfrench@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-cifs@...r.kernel.org
Subject: Re: [PATCH] cifs: remove the sockopt= mount option

On Mon, 4 Mar 2013 16:08:30 -0600
Steve French <smfrench@...il.com> wrote:

> Resending patch to a slightly broader list for last minute check if
> anyone objects.  Although setting this particular socket option
> (TCP_NODELAY) may not be as useful when corking/uncorking explicitly,
> I want to doublecheck before removing them because there has been some
> utility to the server allowing override of various sockopt options.
> Samba server has long supported at least the following set of settable
> socket options (although I don't know if the defaults are frequently
> overridden now, by setting sockopts in smb.conf as used to be common
> for the server).
> 
> SO_KEEPALIVE
> SO_REUSEADDR
> SO_BROADCAST
> TCP_NODELAY
> IPTOS_LOWDELAY
> IPTOS_THROUGHPUT
> SO_SNDBUF *
> SO_RCVBUF *
> SO_SNDLOWAT *
> SO_RCVLOWAT *
> 
> * takes an integer argument rather than a boolean on/off
> 
> Any objections to removing the ability to set socket options
> explicitly for the cifs network file system client?
> 

A couple of points...

The sockopt= option was never documented in the mount.cifs manpage and
the only value it ever accepted was TCP_NODELAY. Now that we're
explicitly corking the socket, TCP_NODELAY has no effect. I don't think
there's any value in leaving in a "placeholder" socket= option.

-- 
Jeff Layton <jlayton@...hat.com>
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