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lockd: Start PF_INET6 listener only if IPv6 support is available

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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>
This commit is contained in:
Chuck Lever
2009-03-18 20:47:59 -04:00
committed by Trond Myklebust
parent 9355982830
commit eb16e90778
2 changed files with 22 additions and 59 deletions
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30
fs/lockd/svc.c
View File

@@ -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;