From 7fcb98d58cb4d18af6386f71025fc5192f25fbca Mon Sep 17 00:00:00 2001 From: Tom Tucker Date: Sun, 30 Dec 2007 21:08:33 -0600 Subject: 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 Acked-by: Neil Brown Reviewed-by: Chuck Lever Reviewed-by: Greg Banks Signed-off-by: J. Bruce Fields --- net/sunrpc/svc_xprt.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) (limited to 'net/sunrpc') diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c index 2e5b92ae24e..512c10fc1a9 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) spin_unlock(&xprt->xpt_lock); return dr; } + +/* + * Return the transport instance pointer for the endpoint accepting + * connections/peer traffic from the specified transport class, + * address family and port. + * + * 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. + */ +struct svc_xprt *svc_find_xprt(struct svc_serv *serv, char *xcl_name, + int af, int port) +{ + struct svc_xprt *xprt; + struct svc_xprt *found = NULL; + + /* Sanity check the args */ + if (!serv || !xcl_name) + return found; + + spin_lock_bh(&serv->sv_lock); + list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) { + if (strcmp(xprt->xpt_class->xcl_name, xcl_name)) + continue; + if (af != AF_UNSPEC && af != xprt->xpt_local.ss_family) + continue; + if (port && port != svc_xprt_local_port(xprt)) + continue; + found = xprt; + break; + } + spin_unlock_bh(&serv->sv_lock); + return found; +} +EXPORT_SYMBOL_GPL(svc_find_xprt); -- cgit v1.2.3