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Commit f0418aa4 authored by J. Bruce Fields's avatar J. Bruce Fields
Browse files

rpc: allow xprt_class->setup to return a preexisting xprt 



This allows us to reuse the xprt associated with a server connection if
one has already been set up.

Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 99de8ea9

include/linux/sunrpc/xprt.h

+1 −0
Original line number Diff line number Diff line
@@ -321,6 +321,7 @@ void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie); 
#define XPRT_CLOSING		(6)

#define XPRT_CONNECTION_ABORT	(7)

#define XPRT_CONNECTION_CLOSE	(8)

#define XPRT_INITIALIZED	(9)



static inline void xprt_set_connected(struct rpc_xprt *xprt)

{

net/sunrpc/xprt.c

+3 −0
Original line number Diff line number Diff line
@@ -1102,6 +1102,9 @@ struct rpc_xprt *xprt_create_transport(struct xprt_create *args) 
				-PTR_ERR(xprt));

		return xprt;

	}

	if (test_and_set_bit(XPRT_INITIALIZED, &xprt->state))

		/* ->setup returned a pre-initialized xprt: */

		return xprt;



	spin_lock_init(&xprt->transport_lock);

	spin_lock_init(&xprt->reserve_lock);

net/sunrpc/xprtsock.c

+9 −9
Original line number Diff line number Diff line
@@ -2359,6 +2359,15 @@ static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 
	struct svc_sock *bc_sock;

	struct rpc_xprt *ret;



	if (args->bc_xprt->xpt_bc_xprt) {

		/*

		 * This server connection already has a backchannel

		 * export; we can't create a new one, as we wouldn't be

		 * able to match replies based on xid any more.  So,

		 * reuse the already-existing one:

		 */

		 return args->bc_xprt->xpt_bc_xprt;

	}

	xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);

	if (IS_ERR(xprt))

		return xprt;
@@ -2396,15 +2405,6 @@ static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 
			xprt->address_strings[RPC_DISPLAY_PORT],

			xprt->address_strings[RPC_DISPLAY_PROTO]);



	/*

	 * The backchannel uses the same socket connection as the

	 * forechannel

	 */

	if (args->bc_xprt->xpt_bc_xprt) {

		/* XXX: actually, want to catch this case... */

		ret = ERR_PTR(-EINVAL);

		goto out_err;

	}

	/*

	 * Once we've associated a backchannel xprt with a connection,

	 * we want to keep it around as long as long as the connection