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SUNRPC: Finish API to load RPC transport implementations dynamically

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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>
This commit is contained in:
\"Talpey, Thomas\ 2007-09-10 13:46:39 -04:00 committed by Trond Myklebust
parent 81c098af3d
commit bc25571e21
2 changed files with 57 additions and 16 deletions
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26
net/sunrpc/xprt.c
View file

@ -983,19 +983,23 @@ struct rpc_xprt *xprt_create_transport(struct rpc_xprtsock_create *args)
{
struct rpc_xprt *xprt;
struct rpc_rqst *req;
struct xprt_class *t;
switch (args->proto) {
case IPPROTO_UDP:
xprt = xs_setup_udp(args);
break;
case IPPROTO_TCP:
xprt = xs_setup_tcp(args);
break;
default:
printk(KERN_ERR "RPC: unrecognized transport protocol: %d\n",
args->proto);
return ERR_PTR(-EIO);
spin_lock(&xprt_list_lock);
list_for_each_entry(t, &xprt_list, list) {
if ((t->family == args->dstaddr->sa_family) &&
(t->protocol == args->proto)) {
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);
return ERR_PTR(-EIO);
found:
xprt = t->setup(args);
if (IS_ERR(xprt)) {
dprintk("RPC: xprt_create_transport: failed, %ld\n",
-PTR_ERR(xprt));

47
net/sunrpc/xprtsock.c
View file

@ -20,6 +20,7 @@
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/capability.h>
#include <linux/pagemap.h>
#include <linux/errno.h>
@ -777,6 +778,7 @@ static void xs_destroy(struct rpc_xprt *xprt)
xs_free_peer_addresses(xprt);
kfree(xprt->slot);
kfree(xprt);
module_put(THIS_MODULE);
}
static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
@ -1782,7 +1784,8 @@ static struct rpc_xprt_ops xs_tcp_ops = {
.print_stats = xs_tcp_print_stats,
};
static struct rpc_xprt *xs_setup_xprt(struct rpc_xprtsock_create *args, unsigned int slot_table_size)
static struct rpc_xprt *xs_setup_xprt(struct rpc_xprtsock_create *args,
unsigned int slot_table_size)
{
struct rpc_xprt *xprt;
struct sock_xprt *new;
@ -1876,7 +1879,12 @@ struct rpc_xprt *xs_setup_udp(struct rpc_xprtsock_create *args)
dprintk("RPC: set up transport to address %s\n",
xprt->address_strings[RPC_DISPLAY_ALL]);
return xprt;
if (try_module_get(THIS_MODULE))
return xprt;
kfree(xprt->slot);
kfree(xprt);
return ERR_PTR(-EINVAL);
}
/**
@ -1934,11 +1942,34 @@ struct rpc_xprt *xs_setup_tcp(struct rpc_xprtsock_create *args)
dprintk("RPC: set up transport to address %s\n",
xprt->address_strings[RPC_DISPLAY_ALL]);
return xprt;
if (try_module_get(THIS_MODULE))
return xprt;
kfree(xprt->slot);
kfree(xprt);
return ERR_PTR(-EINVAL);
}
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,
.setup = xs_setup_udp,
};
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,
.setup = xs_setup_tcp,
};
/**
* init_socket_xprt - set up xprtsock's sysctls
* init_socket_xprt - set up xprtsock's sysctls, register with RPC client
*
*/
int init_socket_xprt(void)
@ -1948,11 +1979,14 @@ int init_socket_xprt(void)
sunrpc_table_header = register_sysctl_table(sunrpc_table);
#endif
xprt_register_transport(&xs_udp_transport);
xprt_register_transport(&xs_tcp_transport);
return 0;
}
/**
* cleanup_socket_xprt - remove xprtsock's sysctls
* cleanup_socket_xprt - remove xprtsock's sysctls, unregister
*
*/
void cleanup_socket_xprt(void)
@ -1963,4 +1997,7 @@ void cleanup_socket_xprt(void)
sunrpc_table_header = NULL;
}
#endif
xprt_unregister_transport(&xs_udp_transport);
xprt_unregister_transport(&xs_tcp_transport);
}