1 files changed, 42 insertions, 28 deletions

diff --git a/net/sunrpc/pmap_clnt.c b/net/sunrpc/pmap_clnt.c
index 59d542436ca9..0efcbf1302a2 100644
--- a/net/sunrpc/pmap_clnt.c
+++ b/net/sunrpc/pmap_clnt.c
@@ -1,7 +1,9 @@
 /*
- * linux/net/sunrpc/pmap.c
+ * linux/net/sunrpc/pmap_clnt.c
  *
- * Portmapper client.
+ * In-kernel RPC portmapper client.
+ *
+ * Portmapper supports version 2 of the rpcbind protocol (RFC 1833).
  *
  * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
  */
@@ -76,12 +78,15 @@ static inline void pmap_wake_portmap_waiters(struct rpc_xprt *xprt)
         rpc_wake_up(&xprt->binding);
 }
 
-/*
- * Obtain the port for a given RPC service on a given host. This one can
- * be called for an ongoing RPC request.
+/**
+ * rpc_getport - obtain the port for a given RPC service on a given host
+ * @task: task that is waiting for portmapper request
+ * @clnt: controlling rpc_clnt
+ *
+ * This one can be called for an ongoing RPC request, and can be used in
+ * an async (rpciod) context.
  */
-void
-rpc_getport(struct rpc_task *task, struct rpc_clnt *clnt)
+void rpc_getport(struct rpc_task *task, struct rpc_clnt *clnt)
 {
         struct rpc_xprt *xprt = task->tk_xprt;
         struct sockaddr_in *sap = &xprt->addr;
@@ -144,8 +149,16 @@ bailout_nofree:
 }
 
 #ifdef CONFIG_ROOT_NFS
-int
-rpc_getport_external(struct sockaddr_in *sin, __u32 prog, __u32 vers, int prot)
+/**
+ * rpc_getport_external - obtain the port for a given RPC service on a given host
+ * @sin: address of remote peer
+ * @prog: RPC program number to bind
+ * @vers: RPC version number to bind
+ * @prot: transport protocol to use to make this request
+ *
+ * This one is called from outside the RPC client in a synchronous task context.
+ */
+int rpc_getport_external(struct sockaddr_in *sin, __u32 prog, __u32 vers, int prot)
 {
         struct portmap_args map = {
                 .pm_prog        = prog,
@@ -162,7 +175,7 @@ rpc_getport_external(struct sockaddr_in *sin, __u32 prog, __u32 vers, int prot)
         char            hostname[32];
         int             status;
 
-        dprintk("RPC:      rpc_getport_external(%u.%u.%u.%u, %d, %d, %d)\n",
+        dprintk("RPC:      rpc_getport_external(%u.%u.%u.%u, %u, %u, %d)\n",
                         NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot);
 
         sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(sin->sin_addr.s_addr));
@@ -182,8 +195,10 @@ rpc_getport_external(struct sockaddr_in *sin, __u32 prog, __u32 vers, int prot)
 }
 #endif
 
-static void
-pmap_getport_done(struct rpc_task *child, void *data)
+/*
+ * Portmapper child task invokes this callback via tk_exit.
+ */
+static void pmap_getport_done(struct rpc_task *child, void *data)
 {
         struct portmap_args *map = data;
         struct rpc_task *task = map->pm_task;
@@ -211,12 +226,17 @@ pmap_getport_done(struct rpc_task *child, void *data)
         pmap_wake_portmap_waiters(xprt);
 }
 
-/*
- * Set or unset a port registration with the local portmapper.
+/**
+ * rpc_register - set or unset a port registration with the local portmapper
+ * @prog: RPC program number to bind
+ * @vers: RPC version number to bind
+ * @prot: transport protocol to use to make this request
+ * @port: port value to register
+ * @okay: result code
+ *
  * port == 0 means unregister, port != 0 means register.
  */
-int
-rpc_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
+int rpc_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
 {
         struct sockaddr_in      sin = {
                 .sin_family     = AF_INET,
@@ -236,7 +256,7 @@ rpc_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
         struct rpc_clnt         *pmap_clnt;
         int error = 0;
 
-        dprintk("RPC: registering (%d, %d, %d, %d) with portmapper.\n",
+        dprintk("RPC: registering (%u, %u, %d, %u) with portmapper.\n",
                         prog, vers, prot, port);
 
         pmap_clnt = pmap_create("localhost", &sin, IPPROTO_UDP, 1);
@@ -259,13 +279,11 @@ rpc_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
         return error;
 }
 
-static struct rpc_clnt *
-pmap_create(char *hostname, struct sockaddr_in *srvaddr, int proto, int privileged)
+static struct rpc_clnt *pmap_create(char *hostname, struct sockaddr_in *srvaddr, int proto, int privileged)
 {
         struct rpc_xprt *xprt;
         struct rpc_clnt *clnt;
 
-        /* printk("pmap: create xprt\n"); */
         xprt = xprt_create_proto(proto, srvaddr, NULL);
         if (IS_ERR(xprt))
                 return (struct rpc_clnt *)xprt;
@@ -274,7 +292,6 @@ pmap_create(char *hostname, struct sockaddr_in *srvaddr, int proto, int privileg
         if (!privileged)
                 xprt->resvport = 0;
 
-        /* printk("pmap: create clnt\n"); */
         clnt = rpc_new_client(xprt, hostname,
                                 &pmap_program, RPC_PMAP_VERSION,
                                 RPC_AUTH_UNIX);
@@ -288,10 +305,9 @@ pmap_create(char *hostname, struct sockaddr_in *srvaddr, int proto, int privileg
 /*
  * XDR encode/decode functions for PMAP
  */
-static int
-xdr_encode_mapping(struct rpc_rqst *req, u32 *p, struct portmap_args *map)
+static int xdr_encode_mapping(struct rpc_rqst *req, u32 *p, struct portmap_args *map)
 {
-        dprintk("RPC: xdr_encode_mapping(%d, %d, %d, %d)\n",
+        dprintk("RPC: xdr_encode_mapping(%u, %u, %u, %u)\n",
                 map->pm_prog, map->pm_vers, map->pm_prot, map->pm_port);
         *p++ = htonl(map->pm_prog);
         *p++ = htonl(map->pm_vers);
@@ -302,15 +318,13 @@ xdr_encode_mapping(struct rpc_rqst *req, u32 *p, struct portmap_args *map)
         return 0;
 }
 
-static int
-xdr_decode_port(struct rpc_rqst *req, u32 *p, unsigned short *portp)
+static int xdr_decode_port(struct rpc_rqst *req, u32 *p, unsigned short *portp)
 {
         *portp = (unsigned short) ntohl(*p++);
         return 0;
 }
 
-static int
-xdr_decode_bool(struct rpc_rqst *req, u32 *p, unsigned int *boolp)
+static int xdr_decode_bool(struct rpc_rqst *req, u32 *p, unsigned int *boolp)
 {
         *boolp = (unsigned int) ntohl(*p++);
         return 0;