SUNRPC: Create API for displaying remote peer address

Provide an API for formatting the remote peer address for printing without
exposing its internal structure.  The address could be dynamic, so we
support a function call to get the address rather than reading it straight
out of a structure.

Test-plan:
Destructive testing (unplugging the network temporarily).  Probably need
to rig a server where certain services aren't running, or that returns an
error for some typical operation.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h
index 65196b0..b7d47f0 100644 (file)
--- a/include/linux/sunrpc/clnt.h
+++ b/include/linux/sunrpc/clnt.h
@@ -124,6 +124,7 @@ size_t              rpc_max_payload(struct rpc_clnt *);
 void           rpc_force_rebind(struct rpc_clnt *);
 int            rpc_ping(struct rpc_clnt *clnt, int flags);
 size_t         rpc_peeraddr(struct rpc_clnt *, struct sockaddr *, size_t);
+char *         rpc_peeraddr2str(struct rpc_clnt *, enum rpc_display_format_t);
 
 /*
  * Helper function for NFSroot support

diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 94768cf..e5b19e3 100644 (file)
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -554,6 +554,19 @@ size_t rpc_peeraddr(struct rpc_clnt *clnt, struct sockaddr *buf, size_t bufsize)
 }
 EXPORT_SYMBOL(rpc_peeraddr);
 
+/**
+ * rpc_peeraddr2str - return remote peer address in printable format
+ * @clnt: RPC client structure
+ * @format: address format
+ *
+ */
+char *rpc_peeraddr2str(struct rpc_clnt *clnt, enum rpc_display_format_t format)
+{
+       struct rpc_xprt *xprt = clnt->cl_xprt;
+       return xprt->ops->print_addr(xprt, format);
+}
+EXPORT_SYMBOL(rpc_peeraddr2str);
+
 void
 rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize)
 {