linux-kernel - Re: [PATCH] ceph: use kernel DNS resolver

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Message-ID: <Pine.LNX.4.64.1109231213580.31698@cobra.newdream.net>
Date:	Fri, 23 Sep 2011 12:15:37 -0700 (PDT)
From:	Sage Weil <sage@...dream.net>
To:	Noah Watkins <noahwatkins@...il.com>
cc:	ceph-devel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ceph: use kernel DNS resolver

On Fri, 23 Sep 2011, Noah Watkins wrote:
> On Thu, Sep 22, 2011 at 14:29, Sage Weil <sage@...dream.net> wrote:
> > Currently the dns resolution is handled by mount.ceph and 'rbd map/unmap'.
> > I don't think that will go away (at the very least need to support old
> > kernels).
> 
> This is good to know. I never encountered the DNS lookup because I've
> always used a non-standard installation path, avoiding mount.ceph.
> 
> > Allowing this in the raw kernel interface would be nice, but I don't think
> > we want make DNS_RESOLVER a strict dependency, since it's new, kind of
> > kludgey, and a ripe target for compiling out of small or secure kernels.
> > Can you make it build either with or without it?
> 
> I sent out a new version of the patch that defines a libceph specific 
> configuration option to use the in-kernel dns resolver.

So I was actually thinking we could just #ifdef off of 
CONFIG_DNS_RESOLVER, but I think your approach might be better because 
you'll see it in the config process and turn it on, vs having to dig 
through to wherever DNS_RESOLVER lives in kconfig.

Maybe it should default y though?

sage
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