Re: [PATCH 3/3] NFSD: Enable NFS server use of PF_INET6

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On Jan 21, 2010, at 5:07 PM, J. Bruce Fields wrote:

On Fri, Jan 15, 2010 at 06:17:38PM -0500, Chuck Lever wrote:

On Jan 15, 2010, at 5:44 PM, J. Bruce Fields wrote:

On Wed, Jan 13, 2010 at 04:10:48PM -0500, Chuck Lever wrote:
Try to use an PF_INET6 listener for NFSD if IPv6 is enabled in the
kernel.

Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---

fs/nfsd/nfsctl.c |   36 +++++++++++++++++++++++++++++-------
fs/nfsd/nfssvc.c |   27 ++++++++++++++++++++++-----
2 files changed, 51 insertions(+), 12 deletions(-)

diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 2604c3e..7ebb7a5 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -981,6 +981,26 @@ static ssize_t __write_ports_delfd(char *buf)
	return len;
}

+static ssize_t __write_ports_create_xprt(struct svc_serv *serv,
+					 const char *transport,
+					 const int family,
+					 const unsigned short port)
+{
+	int err;
+
+	err = svc_create_xprt(serv, transport, family, port,
+						SVC_SOCK_ANONYMOUS);
+
+	if (err < 0) {
+		/* Give a reasonable perror msg for bad transport string */
+		if (err == -ENOENT)
+			err = -EPROTONOSUPPORT;
+		return err;
+	}
+
+	return 0;
+}
+
/*
* A transport listener is added by writing it's transport name and
* a port number.
@@ -1000,14 +1020,16 @@ static ssize_t __write_ports_addxprt(char
*buf)
	if (err != 0)
		return err;

-	err = svc_create_xprt(nfsd_serv, transport,
-				PF_INET, port, SVC_SOCK_ANONYMOUS);
-	if (err < 0) {
-		/* Give a reasonable perror msg for bad transport string */
-		if (err == -ENOENT)
-			err = -EPROTONOSUPPORT;
+	err = __write_ports_create_xprt(nfsd_serv, transport, PF_INET,
port);
+	if (err < 0)
		return err;
-	}
+
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+	err = __write_ports_create_xprt(nfsd_serv, transport, PF_INET6,
port);
+	if (err < 0 && err != -EAFNOSUPPORT)
+		return err;
+#endif	/* CONFIG_IPV6 || CONFIG_IPV6_MODULE */

Does every caller of __write_ports_create_xprt() with PF_INET6 end up
being under this ifdef?  Could we instead just move the ifdef inside
it
(or inside __svc_xpo_create())?  (As usual I'd rather keep any
necessary
hidden away to the extent possible.)

The only two call sites are right here: one with PF_INET and one with
PF_INET6.

OK, but svc_create_xprt has a few more.


When IPv6 support is not enabled, we want only the first call (with
PF_INET).  When IPv6 support is enabled, we want two calls; one with
PF_INET and then one with PF_INET6.

Right, I understand, but we could equally well do that by calling
svc_create_xprt twice, and depending on it (or __svc_xpo_create(), or
someone else there) to return -EAFNOSUPPORT in the ! defined(CONFIG_IPV6)
&& !defined(CONFIG_IPV6_MODULE case.  Right?

No change in behavior, I just want the #ifdef's buried a little further
if it's possible.

Yeah, OK. That kind of change would effect other call sites, so I would need to break this into a couple of smaller patches.


--b.


This particular interface is for creating a named transport. We don't name our IPv6 transports separately from IPv4 transports, so this is a
simple way to get IPv6 enabled listeners.  It's actually been a while
since I sat down and thought through this.

--b.

+
	return 0;
}

diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index 171699e..7af14c1 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -275,14 +275,32 @@ int nfsd_create_serv(void)
	return err;
}

-static int nfsd_init_socks(int port)
+static int nfsd_create_xprt(const char *transport, const unsigned
short port)
+{
+	int ret;
+
+	ret = svc_create_xprt(nfsd_serv, transport, PF_INET, port,
+							SVC_SOCK_DEFAULTS);
+	if (ret < 0)
+		return ret;
+
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+	ret = svc_create_xprt(nfsd_serv, transport, PF_INET6, port,
+							SVC_SOCK_DEFAULTS);
+	if (ret < 0 && ret != -EAFNOSUPPORT)
+		return ret;
+#endif	/* CONFIG_IPV6 || CONFIG_IPV6_MODULE */
+
+	return 0;
+}
+
+static int nfsd_init_socks(const unsigned short port)
{
	int error;
	if (!list_empty(&nfsd_serv->sv_permsocks))
		return 0;

-	error = svc_create_xprt(nfsd_serv, "udp", PF_INET, port,
-					SVC_SOCK_DEFAULTS);
+	error = nfsd_create_xprt("udp", port);
	if (error < 0)
		return error;

@@ -290,8 +308,7 @@ static int nfsd_init_socks(int port)
	if (error < 0)
		return error;

-	error = svc_create_xprt(nfsd_serv, "tcp", PF_INET, port,
-					SVC_SOCK_DEFAULTS);
+	error = nfsd_create_xprt("tcp", port);
	if (error < 0)
		return error;



--
Chuck Lever
chuck[dot]lever[at]oracle[dot]com




--
Chuck Lever
chuck[dot]lever[at]oracle[dot]com



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