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>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/sunrpc/svc_xprt.h b/include/linux/sunrpc/svc_xprt.h
index 01e71b7a2e20..68862d51bb36 100644
--- a/include/linux/sunrpc/svc_xprt.h
+++ b/include/linux/sunrpc/svc_xprt.h
@@ -80,6 +80,7 @@ void	svc_close_xprt(struct svc_xprt *xprt);
 void    svc_delete_xprt(struct svc_xprt *xprt);
 int     svc_port_is_privileged(struct sockaddr *sin);
 int     svc_print_xprts(char *buf, int maxlen);
+struct  svc_xprt *svc_find_xprt(struct svc_serv *, char *, int, int);
 
 static inline void svc_xprt_get(struct svc_xprt *xprt)
 {