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authorTom Tucker <tom@opengridcomputing.com>2007-12-30 22:08:33 -0500
committerJ. Bruce Fields <bfields@citi.umich.edu>2008-02-01 16:42:13 -0500
commit7fcb98d58cb4d18af6386f71025fc5192f25fbca (patch)
tree7ccd884928c644cebd717306937565fbcdc9dd88 /net
parentdc9a16e49dbba3dd042e6aec5d9a7929e099a89b (diff)
svc: Add svc API that queries for a transport instance
Add a new svc function that allows a service to query whether a transport instance has already been created. This is used in lockd to determine whether or not a transport needs to be created when a lockd instance is brought up. Specifying 0 for the address family or port is effectively a wild-card, and will result in matching the first transport in the service's list that has a matching class name. Signed-off-by: Tom Tucker <tom@opengridcomputing.com> Acked-by: Neil Brown <neilb@suse.de> Reviewed-by: Chuck Lever <chuck.lever@oracle.com> Reviewed-by: Greg Banks <gnb@sgi.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Diffstat (limited to 'net')
-rw-r--r--net/sunrpc/svc_xprt.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index 2e5b92ae24ed..512c10fc1a9f 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -977,3 +977,38 @@ static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt)
977 spin_unlock(&xprt->xpt_lock); 977 spin_unlock(&xprt->xpt_lock);
978 return dr; 978 return dr;
979} 979}
980
981/*
982 * Return the transport instance pointer for the endpoint accepting
983 * connections/peer traffic from the specified transport class,
984 * address family and port.
985 *
986 * Specifying 0 for the address family or port is effectively a
987 * wild-card, and will result in matching the first transport in the
988 * service's list that has a matching class name.
989 */
990struct svc_xprt *svc_find_xprt(struct svc_serv *serv, char *xcl_name,
991 int af, int port)
992{
993 struct svc_xprt *xprt;
994 struct svc_xprt *found = NULL;
995
996 /* Sanity check the args */
997 if (!serv || !xcl_name)
998 return found;
999
1000 spin_lock_bh(&serv->sv_lock);
1001 list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) {
1002 if (strcmp(xprt->xpt_class->xcl_name, xcl_name))
1003 continue;
1004 if (af != AF_UNSPEC && af != xprt->xpt_local.ss_family)
1005 continue;
1006 if (port && port != svc_xprt_local_port(xprt))
1007 continue;
1008 found = xprt;
1009 break;
1010 }
1011 spin_unlock_bh(&serv->sv_lock);
1012 return found;
1013}
1014EXPORT_SYMBOL_GPL(svc_find_xprt);