SUNRPC: Finish API to load RPC transport implementations dynamically
Allow RPC client transport implementations to be loaded as needed, or as they become available from distributors or third-party vendors. Note that we leave the IP sockets implementation in sunrpc.o permanently, as IP functionality is always available in any kernel that runs NFS. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Tom Talpey <tmt@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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@ -983,19 +983,23 @@ struct rpc_xprt *xprt_create_transport(struct rpc_xprtsock_create *args)
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{
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struct rpc_xprt *xprt;
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struct rpc_rqst *req;
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struct xprt_class *t;
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switch (args->proto) {
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case IPPROTO_UDP:
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xprt = xs_setup_udp(args);
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break;
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case IPPROTO_TCP:
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xprt = xs_setup_tcp(args);
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break;
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default:
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printk(KERN_ERR "RPC: unrecognized transport protocol: %d\n",
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args->proto);
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return ERR_PTR(-EIO);
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spin_lock(&xprt_list_lock);
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list_for_each_entry(t, &xprt_list, list) {
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if ((t->family == args->dstaddr->sa_family) &&
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(t->protocol == args->proto)) {
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spin_unlock(&xprt_list_lock);
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goto found;
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}
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}
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spin_unlock(&xprt_list_lock);
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printk(KERN_ERR "RPC: transport (%u/%d) not supported\n",
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args->dstaddr->sa_family, args->proto);
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return ERR_PTR(-EIO);
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found:
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xprt = t->setup(args);
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if (IS_ERR(xprt)) {
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dprintk("RPC: xprt_create_transport: failed, %ld\n",
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-PTR_ERR(xprt));
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@ -20,6 +20,7 @@
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/capability.h>
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#include <linux/pagemap.h>
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#include <linux/errno.h>
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@ -777,6 +778,7 @@ static void xs_destroy(struct rpc_xprt *xprt)
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xs_free_peer_addresses(xprt);
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kfree(xprt->slot);
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kfree(xprt);
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module_put(THIS_MODULE);
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}
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static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
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@ -1782,7 +1784,8 @@ static struct rpc_xprt_ops xs_tcp_ops = {
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.print_stats = xs_tcp_print_stats,
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};
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static struct rpc_xprt *xs_setup_xprt(struct rpc_xprtsock_create *args, unsigned int slot_table_size)
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static struct rpc_xprt *xs_setup_xprt(struct rpc_xprtsock_create *args,
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unsigned int slot_table_size)
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{
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struct rpc_xprt *xprt;
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struct sock_xprt *new;
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@ -1876,7 +1879,12 @@ struct rpc_xprt *xs_setup_udp(struct rpc_xprtsock_create *args)
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dprintk("RPC: set up transport to address %s\n",
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xprt->address_strings[RPC_DISPLAY_ALL]);
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if (try_module_get(THIS_MODULE))
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return xprt;
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kfree(xprt->slot);
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kfree(xprt);
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return ERR_PTR(-EINVAL);
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}
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/**
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@ -1934,11 +1942,34 @@ struct rpc_xprt *xs_setup_tcp(struct rpc_xprtsock_create *args)
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dprintk("RPC: set up transport to address %s\n",
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xprt->address_strings[RPC_DISPLAY_ALL]);
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if (try_module_get(THIS_MODULE))
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return xprt;
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kfree(xprt->slot);
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kfree(xprt);
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return ERR_PTR(-EINVAL);
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}
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static struct xprt_class xs_udp_transport = {
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.list = LIST_HEAD_INIT(xs_udp_transport.list),
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.name = "udp",
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.owner = THIS_MODULE,
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.family = AF_INET,
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.protocol = IPPROTO_UDP,
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.setup = xs_setup_udp,
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};
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static struct xprt_class xs_tcp_transport = {
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.list = LIST_HEAD_INIT(xs_tcp_transport.list),
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.name = "tcp",
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.owner = THIS_MODULE,
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.family = AF_INET,
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.protocol = IPPROTO_TCP,
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.setup = xs_setup_tcp,
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};
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/**
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* init_socket_xprt - set up xprtsock's sysctls
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* init_socket_xprt - set up xprtsock's sysctls, register with RPC client
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*
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*/
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int init_socket_xprt(void)
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@ -1948,11 +1979,14 @@ int init_socket_xprt(void)
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sunrpc_table_header = register_sysctl_table(sunrpc_table);
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#endif
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xprt_register_transport(&xs_udp_transport);
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xprt_register_transport(&xs_tcp_transport);
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return 0;
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}
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/**
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* cleanup_socket_xprt - remove xprtsock's sysctls
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* cleanup_socket_xprt - remove xprtsock's sysctls, unregister
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*
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*/
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void cleanup_socket_xprt(void)
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@ -1963,4 +1997,7 @@ void cleanup_socket_xprt(void)
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sunrpc_table_header = NULL;
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}
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#endif
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xprt_unregister_transport(&xs_udp_transport);
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xprt_unregister_transport(&xs_tcp_transport);
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}
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