NFS/SUNRPC: support transport protocol naming

To prepare for including non-sockets-based RPC transports, select
RPC transports by an identifier (to be used in following patches).

Signed-off-by: Tom Talpey <tmt@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
index d7b8fcd..30b17b3 100644 (file)
--- a/include/linux/sunrpc/xprt.h
+++ b/include/linux/sunrpc/xprt.h
@@ -187,7 +187,7 @@ struct rpc_xprt {
 };
 
 struct xprt_create {
-       int                     proto;          /* IPPROTO_UDP or IPPROTO_TCP */
+       int                     ident;          /* XPRT_TRANSPORT identifier */
        struct sockaddr *       srcaddr;        /* optional local address */
        struct sockaddr *       dstaddr;        /* remote peer address */
        size_t                  addrlen;
@@ -196,8 +196,7 @@ struct xprt_create {
 
 struct xprt_class {
        struct list_head        list;
-       unsigned short          family;
-       int                     protocol;
+       int                     ident;          /* XPRT_TRANSPORT identifier */
        struct rpc_xprt *       (*setup)(struct xprt_create *);
        struct module           *owner;
        char                    name[32];

diff --git a/include/linux/sunrpc/xprtsock.h b/include/linux/sunrpc/xprtsock.h
index 9bde770..2c6c2c2 100644 (file)
--- a/include/linux/sunrpc/xprtsock.h
+++ b/include/linux/sunrpc/xprtsock.h
@@ -19,6 +19,17 @@ int          init_socket_xprt(void);
 void           cleanup_socket_xprt(void);
 
 /*
+ * RPC transport identifiers for UDP, TCP
+ *
+ * To preserve compatibility with the historical use of raw IP protocol
+ * id's for transport selection, these are specified with the previous
+ * values. No such restriction exists for new transports, except that
+ * they may not collide with these values (17 and 6, respectively).
+ */
+#define XPRT_TRANSPORT_UDP     IPPROTO_UDP
+#define XPRT_TRANSPORT_TCP     IPPROTO_TCP
+
+/*
  * RPC slot table sizes for UDP, TCP transports
  */
 extern unsigned int xprt_udp_slot_table_entries;

diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index e86958c..6cdf53c 100644 (file)
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -241,7 +241,7 @@ struct rpc_clnt *rpc_create(struct rpc_create_args *args)
        struct rpc_xprt *xprt;
        struct rpc_clnt *clnt;
        struct xprt_create xprtargs = {
-               .proto = args->protocol,
+               .ident = args->protocol,
                .srcaddr = args->saddress,
                .dstaddr = args->address,
                .addrlen = args->addrsize,

diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index 473b48f..282a9a2 100644 (file)
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -104,7 +104,7 @@ int xprt_register_transport(struct xprt_class *transport)
        spin_lock(&xprt_list_lock);
        list_for_each_entry(t, &xprt_list, list) {
                /* don't register the same transport class twice */
-               if (t == transport)
+               if (t->ident == transport->ident)
                        goto out;
        }
 
@@ -987,15 +987,13 @@ struct rpc_xprt *xprt_create_transport(struct xprt_create *args)
 
        spin_lock(&xprt_list_lock);
        list_for_each_entry(t, &xprt_list, list) {
-               if ((t->family == args->dstaddr->sa_family) &&
-                   (t->protocol == args->proto)) {
+               if (t->ident == args->ident) {
                        spin_unlock(&xprt_list_lock);
                        goto found;
                }
        }
        spin_unlock(&xprt_list_lock);
-       printk(KERN_ERR "RPC: transport (%u/%d) not supported\n",
-                       args->dstaddr->sa_family, args->proto);
+       printk(KERN_ERR "RPC: transport (%d) not supported\n", args->ident);
        return ERR_PTR(-EIO);
 
 found:

diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 192a06e..b81494a 100644 (file)
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -1955,8 +1955,7 @@ static struct xprt_class  xs_udp_transport = {
        .list           = LIST_HEAD_INIT(xs_udp_transport.list),
        .name           = "udp",
        .owner          = THIS_MODULE,
-       .family         = AF_INET,
-       .protocol       = IPPROTO_UDP,
+       .ident          = IPPROTO_UDP,
        .setup          = xs_setup_udp,
 };
 
@@ -1964,8 +1963,7 @@ static struct xprt_class  xs_tcp_transport = {
        .list           = LIST_HEAD_INIT(xs_tcp_transport.list),
        .name           = "tcp",
        .owner          = THIS_MODULE,
-       .family         = AF_INET,
-       .protocol       = IPPROTO_TCP,
+       .ident          = IPPROTO_TCP,
        .setup          = xs_setup_tcp,
 };