SUNRPC: Fix rpc_sockaddr2uaddr

rpc_sockaddr2uaddr is only used by net/sunrpc/rpcb_clnt.c, where
it is used in a non-blockable context in at least one case.

Add non-blocking capability by adding a gfp_t argument
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

include/linux/sunrpc/clnt.h

@@ -9,6 +9,7 @@
 #ifndef _LINUX_SUNRPC_CLNT_H
 #define _LINUX_SUNRPC_CLNT_H
 
+#include <linux/types.h>
 #include <linux/socket.h>
 #include <linux/in.h>
 #include <linux/in6.h>
@@ -161,7 +162,7 @@ const char	*rpc_peeraddr2str(struct rpc_clnt *, enum rpc_display_format_t);
 size_t		rpc_ntop(const struct sockaddr *, char *, const size_t);
 size_t		rpc_pton(const char *, const size_t,
 			 struct sockaddr *, const size_t);
-char *		rpc_sockaddr2uaddr(const struct sockaddr *);
+char *		rpc_sockaddr2uaddr(const struct sockaddr *, gfp_t);
 size_t		rpc_uaddr2sockaddr(const char *, const size_t,
 				   struct sockaddr *, const size_t);
 

net/sunrpc/addr.c

@@ -255,12 +255,13 @@ EXPORT_SYMBOL_GPL(rpc_pton);
 /**
  * rpc_sockaddr2uaddr - Construct a universal address string from @sap.
  * @sap: socket address
+ * @gfp_flags: allocation mode
  *
  * Returns a %NUL-terminated string in dynamically allocated memory;
  * otherwise NULL is returned if an error occurred.  Caller must
  * free the returned string.
  */
-char *rpc_sockaddr2uaddr(const struct sockaddr *sap)
+char *rpc_sockaddr2uaddr(const struct sockaddr *sap, gfp_t gfp_flags)
 {
 	char portbuf[RPCBIND_MAXUADDRPLEN];
 	char addrbuf[RPCBIND_MAXUADDRLEN];
@@ -288,7 +289,7 @@ char *rpc_sockaddr2uaddr(const struct sockaddr *sap)
 	if (strlcat(addrbuf, portbuf, sizeof(addrbuf)) > sizeof(addrbuf))
 		return NULL;
 
-	return kstrdup(addrbuf, GFP_KERNEL);
+	return kstrdup(addrbuf, gfp_flags);
 }
 EXPORT_SYMBOL_GPL(rpc_sockaddr2uaddr);
 

net/sunrpc/rpcb_clnt.c

@@ -410,7 +410,7 @@ static int rpcb_register_inet4(const struct sockaddr *sap,
 	unsigned short port = ntohs(sin->sin_port);
 	int result;
 
-	map->r_addr = rpc_sockaddr2uaddr(sap);
+	map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
 
 	dprintk("RPC:       %sregistering [%u, %u, %s, '%s'] with "
 		"local rpcbind\n", (port ? "" : "un"),
@@ -437,7 +437,7 @@ static int rpcb_register_inet6(const struct sockaddr *sap,
 	unsigned short port = ntohs(sin6->sin6_port);
 	int result;
 
-	map->r_addr = rpc_sockaddr2uaddr(sap);
+	map->r_addr = rpc_sockaddr2uaddr(sap, GFP_KERNEL);
 
 	dprintk("RPC:       %sregistering [%u, %u, %s, '%s'] with "
 		"local rpcbind\n", (port ? "" : "un"),
@@ -686,7 +686,7 @@ void rpcb_getport_async(struct rpc_task *task)
 	case RPCBVERS_4:
 	case RPCBVERS_3:
 		map->r_netid = rpc_peeraddr2str(clnt, RPC_DISPLAY_NETID);
-		map->r_addr = rpc_sockaddr2uaddr(sap);
+		map->r_addr = rpc_sockaddr2uaddr(sap, GFP_ATOMIC);
 		map->r_owner = "";
 		break;
 	case RPCBVERS_2: