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authorChuck Lever <chuck.lever@oracle.com>2009-03-18 20:47:59 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2009-03-28 16:01:16 -0400
commiteb16e907781a9da7f272a3e8284c26bc4e4aeb9d (patch)
tree6651fc149d5afbcc44418fe235a2480060ce3c17 /fs/lockd/svc.c
parent9355982830ad67dca35e0f3d43319f3d438f82b4 (diff)
lockd: Start PF_INET6 listener only if IPv6 support is available
Apparently a lot of people need to disable IPv6 completely on their distributor-built systems, which have CONFIG_IPV6_MODULE enabled at build time. They do this by blacklisting the ipv6.ko module. This causes the creation of the lockd service listener to fail if CONFIG_IPV6_MODULE is set, but the module cannot be loaded. Now that the kernel's PF_INET6 RPC listeners are completely separate from PF_INET listeners, we can always start PF_INET. Then lockd can try to start PF_INET6, but it isn't required to be available. Note this has the added benefit that NLM callbacks from AF_INET6 servers will never come from AF_INET remotes. We no longer have to worry about matching mapped IPv4 addresses to AF_INET when comparing addresses. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/lockd/svc.c')
-rw-r--r--fs/lockd/svc.c30
1 files changed, 21 insertions, 9 deletions
diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index 566932b98fd..abf83881f68 100644
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -193,20 +193,30 @@ lockd(void *vrqstp)
return 0;
}
-static int create_lockd_listener(struct svc_serv *serv, char *name,
- unsigned short port)
+static int create_lockd_listener(struct svc_serv *serv, const char *name,
+ const int family, const unsigned short port)
{
struct svc_xprt *xprt;
- xprt = svc_find_xprt(serv, name, 0, 0);
+ xprt = svc_find_xprt(serv, name, family, 0);
if (xprt == NULL)
- return svc_create_xprt(serv, name, PF_INET,
- port, SVC_SOCK_DEFAULTS);
-
+ return svc_create_xprt(serv, name, family, port,
+ SVC_SOCK_DEFAULTS);
svc_xprt_put(xprt);
return 0;
}
+static int create_lockd_family(struct svc_serv *serv, const int family)
+{
+ int err;
+
+ err = create_lockd_listener(serv, "udp", family, nlm_udpport);
+ if (err < 0)
+ return err;
+
+ return create_lockd_listener(serv, "tcp", family, nlm_tcpport);
+}
+
/*
* Ensure there are active UDP and TCP listeners for lockd.
*
@@ -222,13 +232,15 @@ static int make_socks(struct svc_serv *serv)
static int warned;
int err;
- err = create_lockd_listener(serv, "udp", nlm_udpport);
+ err = create_lockd_family(serv, PF_INET);
if (err < 0)
goto out_err;
- err = create_lockd_listener(serv, "tcp", nlm_tcpport);
- if (err < 0)
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+ err = create_lockd_family(serv, PF_INET6);
+ if (err < 0 && err != -EAFNOSUPPORT)
goto out_err;
+#endif /* CONFIG_IPV6 || CONFIG_IPV6_MODULE */
warned = 0;
return 0;