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Message-ID: <e724a63a63f30f927f1780ad9018811bc45bf4e1.camel@kernel.org>
Subject: Re: [PATCH 2/2] nfsd: expose /proc/net/sunrpc/nfsd in net namespaces
From: Jeff Layton <jlayton@kernel.org>
To: Josef Bacik <josef@toxicpanda.com>, Chuck Lever <chuck.lever@oracle.com>
Cc: linux-nfs@vger.kernel.org, kernel-team@fb.com
Date: Wed, 24 Jan 2024 17:57:06 -0500
In-Reply-To: <20240124221258.GA1243606@perftesting>
References: <cover.1706124811.git.josef@toxicpanda.com>
	 <71058c29683d44644aba8ab295fa028ee41365a8.1706124811.git.josef@toxicpanda.com>
	 <ZbFzxmV6zgi/TACb@tissot.1015granger.net>
	 <20240124221258.GA1243606@perftesting>
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On Wed, 2024-01-24 at 17:12 -0500, Josef Bacik wrote:
> On Wed, Jan 24, 2024 at 03:32:06PM -0500, Chuck Lever wrote:
> > On Wed, Jan 24, 2024 at 02:37:00PM -0500, Josef Bacik wrote:
> > > We are running nfsd servers inside of containers with their own netwo=
rk
> > > namespace, and we want to monitor these services using the stats foun=
d
> > > in /proc.  However these are not exposed in the proc inside of the
> > > container, so we have to bind mount the host /proc into our container=
s
> > > to get at this information.
> > >=20
> > > Separate out the stat counters init and the proc registration, and mo=
ve
> > > the proc registration into the pernet operations entry and exit point=
s
> > > so that these stats can be exposed inside of network namespaces.
> >=20
> > Maybe I missed something, but this looks like it exposes the global
> > stat counters to all net namespaces...? Is that an information leak?
> > As an administrator I might be surprised by that behavior.
> >=20
> > Seems like this patch needs to make nfsdstats and nfsd_svcstats into
> > per-namespace objects as well.
> >=20
> >=20
>=20
> I've got the patches written for this, but I've got a question.  There's =
a=20
>=20
> svc_seq_show(seq, &nfsd_svcstats);
>=20
> in nfsd/stats.c.  This appears to be an empty struct, there's nothing tha=
t
> utilizes it, so this is always going to print 0 right?  There's a svc_inf=
o in
> the nfsd_net, and that stats block appears to get updated properly.  Shou=
ld I
> print this out here?  I don't see anywhere we get the rpc stats out of nf=
sd, am
> I missing something?  I don't want to rip out stuff that I don't quite
> understand.  Thanks,
>=20
>=20

nfsd_svcstats ends up being the sv_stats for the nfsd service. The RPC
code has some counters in there for counting different sorts of net and
rpc events (see svc_process_common, and some of the recv and accept
handlers).  I think nfsstat(8) may fetch that info via the above
seqfile, so it's definitely not unused (and it should be printing more
than just a '0').

svc_info is a completely different thing: it's a container for the
svc_serv...so I'm not sure I understand your question?
--=20
Jeff Layton <jlayton@kernel.org>