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Commit 3227886c authored by Trond Myklebust's avatar Trond Myklebust
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SUNRPC: Add a helper to apply a function to all the rpc_clnt's transports 



Add a helper for tasks that require us to apply a function to all the
transports in an rpc_clnt.
An example of a usecase would be BIND_CONN_TO_SESSION, where we want
to send one RPC call down each transport.

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
parent 9d61498d

include/linux/sunrpc/clnt.h

+4 −0
Original line number Diff line number Diff line
@@ -182,6 +182,10 @@ size_t rpc_peeraddr(struct rpc_clnt *, struct sockaddr *, size_t); 
const char	*rpc_peeraddr2str(struct rpc_clnt *, enum rpc_display_format_t);

int		rpc_localaddr(struct rpc_clnt *, struct sockaddr *, size_t);



int 		rpc_clnt_iterate_for_each_xprt(struct rpc_clnt *clnt,

			int (*fn)(struct rpc_clnt *, struct rpc_xprt *, void *),

			void *data);



const char *rpc_proc_name(const struct rpc_task *task);

#endif /* __KERNEL__ */

#endif /* _LINUX_SUNRPC_CLNT_H */

net/sunrpc/clnt.c

+51 −0
Original line number Diff line number Diff line
@@ -736,6 +736,57 @@ int rpc_switch_client_transport(struct rpc_clnt *clnt, 
}

EXPORT_SYMBOL_GPL(rpc_switch_client_transport);



static

int rpc_clnt_xprt_iter_init(struct rpc_clnt *clnt, struct rpc_xprt_iter *xpi)

{

	struct rpc_xprt_switch *xps;



	rcu_read_lock();

	xps = xprt_switch_get(rcu_dereference(clnt->cl_xpi.xpi_xpswitch));

	rcu_read_unlock();

	if (xps == NULL)

		return -EAGAIN;

	xprt_iter_init_listall(xpi, xps);

	xprt_switch_put(xps);

	return 0;

}



/**

 * rpc_clnt_iterate_for_each_xprt - Apply a function to all transports

 * @clnt: pointer to client

 * @fn: function to apply

 * @data: void pointer to function data

 *

 * Iterates through the list of RPC transports currently attached to the

 * client and applies the function fn(clnt, xprt, data).

 *

 * On error, the iteration stops, and the function returns the error value.

 */

int rpc_clnt_iterate_for_each_xprt(struct rpc_clnt *clnt,

		int (*fn)(struct rpc_clnt *, struct rpc_xprt *, void *),

		void *data)

{

	struct rpc_xprt_iter xpi;

	int ret;



	ret = rpc_clnt_xprt_iter_init(clnt, &xpi);

	if (ret)

		return ret;

	for (;;) {

		struct rpc_xprt *xprt = xprt_iter_get_next(&xpi);



		if (!xprt)

			break;

		ret = fn(clnt, xprt, data);

		xprt_put(xprt);

		if (ret < 0)

			break;

	}

	xprt_iter_destroy(&xpi);

	return ret;

}

EXPORT_SYMBOL_GPL(rpc_clnt_iterate_for_each_xprt);



/*

 * Kill all tasks for the given client.

 * XXX: kill their descendants as well?