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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: Tom Talpey <tmtalpey@gmail.com>
Cc: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Tom Talpey 2009-03-11 14:37:56 -04:00 committed by Trond Myklebust
parent b38ab40ad5
commit 441e3e2429
2 changed files with 32 additions and 0 deletions
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1
include/linux/sunrpc/xprt.h
View File

@ -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);

31
net/sunrpc/xprt.c
View File

@ -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