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Commit 7652e5a0 authored by Benny Halevy's avatar Benny Halevy
Browse files

nfs41: sunrpc: provide functions to create and destroy a svc_xprt for backchannel use 



For nfs41 callbacks we need an svc_xprt to process requests coming up the
backchannel socket as rpc_rqst's that are transformed into svc_rqst's that
need a rq_xprt to be processed.

The svc_{udp,tcp}_create methods are too heavy for this job as svc_create_socket
creates an actual socket to listen on while for nfs41 we're "reusing" the
fore channel's socket.

Signed-off-by: default avatarBenny Halevy <bhalevy@panasas.com>
parent a43cde94

include/linux/sunrpc/svcsock.h

+2 −0
Original line number Diff line number Diff line
@@ -42,6 +42,8 @@ int svc_sock_names(char *buf, struct svc_serv *serv, char *toclose); 
int		svc_addsock(struct svc_serv *serv, int fd, char *name_return);

void		svc_init_xprt_sock(void);

void		svc_cleanup_xprt_sock(void);

struct svc_xprt *svc_sock_create(struct svc_serv *serv, int prot);

void		svc_sock_destroy(struct svc_xprt *);



/*

 * svc_makesock socket characteristics

net/sunrpc/svcsock.c

+39 −0
Original line number Diff line number Diff line
@@ -1327,3 +1327,42 @@ static void svc_sock_free(struct svc_xprt *xprt) 
		sock_release(svsk->sk_sock);

	kfree(svsk);

}



/*

 * Create a svc_xprt.

 *

 * For internal use only (e.g. nfsv4.1 backchannel).

 * Callers should typically use the xpo_create() method.

 */

struct svc_xprt *svc_sock_create(struct svc_serv *serv, int prot)

{

	struct svc_sock *svsk;

	struct svc_xprt *xprt = NULL;



	dprintk("svc: %s\n", __func__);

	svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);

	if (!svsk)

		goto out;



	xprt = &svsk->sk_xprt;

	if (prot == IPPROTO_TCP)

		svc_xprt_init(&svc_tcp_class, xprt, serv);

	else if (prot == IPPROTO_UDP)

		svc_xprt_init(&svc_udp_class, xprt, serv);

	else

		BUG();

out:

	dprintk("svc: %s return %p\n", __func__, xprt);

	return xprt;

}

EXPORT_SYMBOL_GPL(svc_sock_create);



/*

 * Destroy a svc_sock.

 */

void svc_sock_destroy(struct svc_xprt *xprt)

{

	if (xprt)

		kfree(container_of(xprt, struct svc_sock, sk_xprt));

}

EXPORT_SYMBOL_GPL(svc_sock_destroy);