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Commit 441e3e24 authored by Tom Talpey's avatar Tom Talpey Committed by Trond Myklebust
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SUNRPC: dynamically load RPC transport modules on-demand 



Provide an api to attempt to load any necessary kernel RPC
client transport module automatically. By convention, the
desired module name is "xprt"+"transport name". For example,
when NFS mounting with "-o proto=rdma", attempt to load the
"xprtrdma" module.

Signed-off-by: default avatarTom Talpey <tmtalpey@gmail.com>
Cc: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent b38ab40a

include/linux/sunrpc/xprt.h

+1 −0
Original line number Diff line number Diff line
@@ -235,6 +235,7 @@ static inline __be32 *xprt_skip_transport_header(struct rpc_xprt *xprt, __be32 * 
 */

int			xprt_register_transport(struct xprt_class *type);

int			xprt_unregister_transport(struct xprt_class *type);

int			xprt_load_transport(const char *);

void			xprt_set_retrans_timeout_def(struct rpc_task *task);

void			xprt_set_retrans_timeout_rtt(struct rpc_task *task);

void			xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status);

net/sunrpc/xprt.c

+31 −0
Original line number Diff line number Diff line
@@ -151,6 +151,37 @@ int xprt_unregister_transport(struct xprt_class *transport) 
}

EXPORT_SYMBOL_GPL(xprt_unregister_transport);



/**

 * xprt_load_transport - load a transport implementation

 * @transport_name: transport to load

 *

 * Returns:

 * 0:		transport successfully loaded

 * -ENOENT:	transport module not available

 */

int xprt_load_transport(const char *transport_name)

{

	struct xprt_class *t;

	char module_name[sizeof t->name + 5];

	int result;



	result = 0;

	spin_lock(&xprt_list_lock);

	list_for_each_entry(t, &xprt_list, list) {

		if (strcmp(t->name, transport_name) == 0) {

			spin_unlock(&xprt_list_lock);

			goto out;

		}

	}

	spin_unlock(&xprt_list_lock);

	strcpy(module_name, "xprt");

	strncat(module_name, transport_name, sizeof t->name);

	result = request_module(module_name);

out:

	return result;

}

EXPORT_SYMBOL_GPL(xprt_load_transport);



/**

 * xprt_reserve_xprt - serialize write access to transports

 * @task: task that is requesting access to the transport