Initial import of modified Linux 2.6.28 tree

Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y

1 files changed, 2129 insertions, 0 deletions

diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
new file mode 100644
index 0000000..0a50361
--- /dev/null
+++ b/net/sunrpc/xprtsock.c
@@ -0,0 +1,2129 @@
+/*
+ * linux/net/sunrpc/xprtsock.c
+ *
+ * Client-side transport implementation for sockets.
+ *
+ * TCP callback races fixes (C) 1998 Red Hat
+ * TCP send fixes (C) 1998 Red Hat
+ * TCP NFS related read + write fixes
+ *  (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
+ *
+ * Rewrite of larges part of the code in order to stabilize TCP stuff.
+ * Fix behaviour when socket buffer is full.
+ *  (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
+ *
+ * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
+ *
+ * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
+ *   <gilles.quillard@bull.net>
+ */
+
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/capability.h>
+#include <linux/pagemap.h>
+#include <linux/errno.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/net.h>
+#include <linux/mm.h>
+#include <linux/udp.h>
+#include <linux/tcp.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/xprtsock.h>
+#include <linux/file.h>
+
+#include <net/sock.h>
+#include <net/checksum.h>
+#include <net/udp.h>
+#include <net/tcp.h>
+
+/*
+ * xprtsock tunables
+ */
+unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
+unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
+
+unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
+unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
+
+/*
+ * We can register our own files under /proc/sys/sunrpc by
+ * calling register_sysctl_table() again.  The files in that
+ * directory become the union of all files registered there.
+ *
+ * We simply need to make sure that we don't collide with
+ * someone else's file names!
+ */
+
+#ifdef RPC_DEBUG
+
+static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
+static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
+static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
+static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
+
+static struct ctl_table_header *sunrpc_table_header;
+
+/*
+ * FIXME: changing the UDP slot table size should also resize the UDP
+ *        socket buffers for existing UDP transports
+ */
+static ctl_table xs_tunables_table[] = {
+	{
+		.ctl_name	= CTL_SLOTTABLE_UDP,
+		.procname	= "udp_slot_table_entries",
+		.data		= &xprt_udp_slot_table_entries,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_minmax,
+		.strategy	= &sysctl_intvec,
+		.extra1		= &min_slot_table_size,
+		.extra2		= &max_slot_table_size
+	},
+	{
+		.ctl_name	= CTL_SLOTTABLE_TCP,
+		.procname	= "tcp_slot_table_entries",
+		.data		= &xprt_tcp_slot_table_entries,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_minmax,
+		.strategy	= &sysctl_intvec,
+		.extra1		= &min_slot_table_size,
+		.extra2		= &max_slot_table_size
+	},
+	{
+		.ctl_name	= CTL_MIN_RESVPORT,
+		.procname	= "min_resvport",
+		.data		= &xprt_min_resvport,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_minmax,
+		.strategy	= &sysctl_intvec,
+		.extra1		= &xprt_min_resvport_limit,
+		.extra2		= &xprt_max_resvport_limit
+	},
+	{
+		.ctl_name	= CTL_MAX_RESVPORT,
+		.procname	= "max_resvport",
+		.data		= &xprt_max_resvport,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_minmax,
+		.strategy	= &sysctl_intvec,
+		.extra1		= &xprt_min_resvport_limit,
+		.extra2		= &xprt_max_resvport_limit
+	},
+	{
+		.ctl_name = 0,
+	},
+};
+
+static ctl_table sunrpc_table[] = {
+	{
+		.ctl_name	= CTL_SUNRPC,
+		.procname	= "sunrpc",
+		.mode		= 0555,
+		.child		= xs_tunables_table
+	},
+	{
+		.ctl_name = 0,
+	},
+};
+
+#endif
+
+/*
+ * Time out for an RPC UDP socket connect.  UDP socket connects are
+ * synchronous, but we set a timeout anyway in case of resource
+ * exhaustion on the local host.
+ */
+#define XS_UDP_CONN_TO		(5U * HZ)
+
+/*
+ * Wait duration for an RPC TCP connection to be established.  Solaris
+ * NFS over TCP uses 60 seconds, for example, which is in line with how
+ * long a server takes to reboot.
+ */
+#define XS_TCP_CONN_TO		(60U * HZ)
+
+/*
+ * Wait duration for a reply from the RPC portmapper.
+ */
+#define XS_BIND_TO		(60U * HZ)
+
+/*
+ * Delay if a UDP socket connect error occurs.  This is most likely some
+ * kind of resource problem on the local host.
+ */
+#define XS_UDP_REEST_TO		(2U * HZ)
+
+/*
+ * The reestablish timeout allows clients to delay for a bit before attempting
+ * to reconnect to a server that just dropped our connection.
+ *
+ * We implement an exponential backoff when trying to reestablish a TCP
+ * transport connection with the server.  Some servers like to drop a TCP
+ * connection when they are overworked, so we start with a short timeout and
+ * increase over time if the server is down or not responding.
+ */
+#define XS_TCP_INIT_REEST_TO	(3U * HZ)
+#define XS_TCP_MAX_REEST_TO	(5U * 60 * HZ)
+
+/*
+ * TCP idle timeout; client drops the transport socket if it is idle
+ * for this long.  Note that we also timeout UDP sockets to prevent
+ * holding port numbers when there is no RPC traffic.
+ */
+#define XS_IDLE_DISC_TO		(5U * 60 * HZ)
+
+#ifdef RPC_DEBUG
+# undef  RPC_DEBUG_DATA
+# define RPCDBG_FACILITY	RPCDBG_TRANS
+#endif
+
+#ifdef RPC_DEBUG_DATA
+static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
+{
+	u8 *buf = (u8 *) packet;
+	int j;
+
+	dprintk("RPC:       %s\n", msg);
+	for (j = 0; j < count && j < 128; j += 4) {
+		if (!(j & 31)) {
+			if (j)
+				dprintk("\n");
+			dprintk("0x%04x ", j);
+		}
+		dprintk("%02x%02x%02x%02x ",
+			buf[j], buf[j+1], buf[j+2], buf[j+3]);
+	}
+	dprintk("\n");
+}
+#else
+static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
+{
+	/* NOP */
+}
+#endif
+
+struct sock_xprt {
+	struct rpc_xprt		xprt;
+
+	/*
+	 * Network layer
+	 */
+	struct socket *		sock;
+	struct sock *		inet;
+
+	/*
+	 * State of TCP reply receive
+	 */
+	__be32			tcp_fraghdr,
+				tcp_xid;
+
+	u32			tcp_offset,
+				tcp_reclen;
+
+	unsigned long		tcp_copied,
+				tcp_flags;
+
+	/*
+	 * Connection of transports
+	 */
+	struct delayed_work	connect_worker;
+	struct sockaddr_storage	addr;
+	unsigned short		port;
+
+	/*
+	 * UDP socket buffer size parameters
+	 */
+	size_t			rcvsize,
+				sndsize;
+
+	/*
+	 * Saved socket callback addresses
+	 */
+	void			(*old_data_ready)(struct sock *, int);
+	void			(*old_state_change)(struct sock *);
+	void			(*old_write_space)(struct sock *);
+	void			(*old_error_report)(struct sock *);
+};
+
+/*
+ * TCP receive state flags
+ */
+#define TCP_RCV_LAST_FRAG	(1UL << 0)
+#define TCP_RCV_COPY_FRAGHDR	(1UL << 1)
+#define TCP_RCV_COPY_XID	(1UL << 2)
+#define TCP_RCV_COPY_DATA	(1UL << 3)
+
+static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
+{
+	return (struct sockaddr *) &xprt->addr;
+}
+
+static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
+{
+	return (struct sockaddr_in *) &xprt->addr;
+}
+
+static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
+{
+	return (struct sockaddr_in6 *) &xprt->addr;
+}
+
+static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt,
+					  const char *protocol,
+					  const char *netid)
+{
+	struct sockaddr_in *addr = xs_addr_in(xprt);
+	char *buf;
+
+	buf = kzalloc(20, GFP_KERNEL);
+	if (buf) {
+		snprintf(buf, 20, NIPQUAD_FMT,
+				NIPQUAD(addr->sin_addr.s_addr));
+	}
+	xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
+
+	buf = kzalloc(8, GFP_KERNEL);
+	if (buf) {
+		snprintf(buf, 8, "%u",
+				ntohs(addr->sin_port));
+	}
+	xprt->address_strings[RPC_DISPLAY_PORT] = buf;
+
+	xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
+
+	buf = kzalloc(48, GFP_KERNEL);
+	if (buf) {
+		snprintf(buf, 48, "addr="NIPQUAD_FMT" port=%u proto=%s",
+			NIPQUAD(addr->sin_addr.s_addr),
+			ntohs(addr->sin_port),
+			protocol);
+	}
+	xprt->address_strings[RPC_DISPLAY_ALL] = buf;
+
+	buf = kzalloc(10, GFP_KERNEL);
+	if (buf) {
+		snprintf(buf, 10, "%02x%02x%02x%02x",
+				NIPQUAD(addr->sin_addr.s_addr));
+	}
+	xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
+
+	buf = kzalloc(8, GFP_KERNEL);
+	if (buf) {
+		snprintf(buf, 8, "%4hx",
+				ntohs(addr->sin_port));
+	}
+	xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
+
+	buf = kzalloc(30, GFP_KERNEL);
+	if (buf) {
+		snprintf(buf, 30, NIPQUAD_FMT".%u.%u",
+				NIPQUAD(addr->sin_addr.s_addr),
+				ntohs(addr->sin_port) >> 8,
+				ntohs(addr->sin_port) & 0xff);
+	}
+	xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
+
+	xprt->address_strings[RPC_DISPLAY_NETID] = netid;
+}
+
+static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt,
+					  const char *protocol,
+					  const char *netid)
+{
+	struct sockaddr_in6 *addr = xs_addr_in6(xprt);
+	char *buf;
+
+	buf = kzalloc(40, GFP_KERNEL);
+	if (buf) {
+		snprintf(buf, 40, NIP6_FMT,
+				NIP6(addr->sin6_addr));
+	}
+	xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
+
+	buf = kzalloc(8, GFP_KERNEL);
+	if (buf) {
+		snprintf(buf, 8, "%u",
+				ntohs(addr->sin6_port));
+	}
+	xprt->address_strings[RPC_DISPLAY_PORT] = buf;
+
+	xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
+
+	buf = kzalloc(64, GFP_KERNEL);
+	if (buf) {
+		snprintf(buf, 64, "addr="NIP6_FMT" port=%u proto=%s",
+				NIP6(addr->sin6_addr),
+				ntohs(addr->sin6_port),
+				protocol);
+	}
+	xprt->address_strings[RPC_DISPLAY_ALL] = buf;
+
+	buf = kzalloc(36, GFP_KERNEL);
+	if (buf) {
+		snprintf(buf, 36, NIP6_SEQFMT,
+				NIP6(addr->sin6_addr));
+	}
+	xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
+
+	buf = kzalloc(8, GFP_KERNEL);
+	if (buf) {
+		snprintf(buf, 8, "%4hx",
+				ntohs(addr->sin6_port));
+	}
+	xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
+
+	buf = kzalloc(50, GFP_KERNEL);
+	if (buf) {
+		snprintf(buf, 50, NIP6_FMT".%u.%u",
+				NIP6(addr->sin6_addr),
+				ntohs(addr->sin6_port) >> 8,
+				ntohs(addr->sin6_port) & 0xff);
+	}
+	xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
+
+	xprt->address_strings[RPC_DISPLAY_NETID] = netid;
+}
+
+static void xs_free_peer_addresses(struct rpc_xprt *xprt)
+{
+	unsigned int i;
+
+	for (i = 0; i < RPC_DISPLAY_MAX; i++)
+		switch (i) {
+		case RPC_DISPLAY_PROTO:
+		case RPC_DISPLAY_NETID:
+			continue;
+		default:
+			kfree(xprt->address_strings[i]);
+		}
+}
+
+#define XS_SENDMSG_FLAGS	(MSG_DONTWAIT | MSG_NOSIGNAL)
+
+static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
+{
+	struct msghdr msg = {
+		.msg_name	= addr,
+		.msg_namelen	= addrlen,
+		.msg_flags	= XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
+	};
+	struct kvec iov = {
+		.iov_base	= vec->iov_base + base,
+		.iov_len	= vec->iov_len - base,
+	};
+
+	if (iov.iov_len != 0)
+		return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
+	return kernel_sendmsg(sock, &msg, NULL, 0, 0);
+}
+
+static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
+{
+	struct page **ppage;
+	unsigned int remainder;
+	int err, sent = 0;
+
+	remainder = xdr->page_len - base;
+	base += xdr->page_base;
+	ppage = xdr->pages + (base >> PAGE_SHIFT);
+	base &= ~PAGE_MASK;
+	for(;;) {
+		unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
+		int flags = XS_SENDMSG_FLAGS;
+
+		remainder -= len;
+		if (remainder != 0 || more)
+			flags |= MSG_MORE;
+		err = sock->ops->sendpage(sock, *ppage, base, len, flags);
+		if (remainder == 0 || err != len)
+			break;
+		sent += err;
+		ppage++;
+		base = 0;
+	}
+	if (sent == 0)
+		return err;
+	if (err > 0)
+		sent += err;
+	return sent;
+}
+
+/**
+ * xs_sendpages - write pages directly to a socket
+ * @sock: socket to send on
+ * @addr: UDP only -- address of destination
+ * @addrlen: UDP only -- length of destination address
+ * @xdr: buffer containing this request
+ * @base: starting position in the buffer
+ *
+ */
+static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
+{
+	unsigned int remainder = xdr->len - base;
+	int err, sent = 0;
+
+	if (unlikely(!sock))
+		return -ENOTCONN;
+
+	clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
+	if (base != 0) {
+		addr = NULL;
+		addrlen = 0;
+	}
+
+	if (base < xdr->head[0].iov_len || addr != NULL) {
+		unsigned int len = xdr->head[0].iov_len - base;
+		remainder -= len;
+		err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
+		if (remainder == 0 || err != len)
+			goto out;
+		sent += err;
+		base = 0;
+	} else
+		base -= xdr->head[0].iov_len;
+
+	if (base < xdr->page_len) {
+		unsigned int len = xdr->page_len - base;
+		remainder -= len;
+		err = xs_send_pagedata(sock, xdr, base, remainder != 0);
+		if (remainder == 0 || err != len)
+			goto out;
+		sent += err;
+		base = 0;
+	} else
+		base -= xdr->page_len;
+
+	if (base >= xdr->tail[0].iov_len)
+		return sent;
+	err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
+out:
+	if (sent == 0)
+		return err;
+	if (err > 0)
+		sent += err;
+	return sent;
+}
+
+static void xs_nospace_callback(struct rpc_task *task)
+{
+	struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
+
+	transport->inet->sk_write_pending--;
+	clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
+}
+
+/**
+ * xs_nospace - place task on wait queue if transmit was incomplete
+ * @task: task to put to sleep
+ *
+ */
+static void xs_nospace(struct rpc_task *task)
+{
+	struct rpc_rqst *req = task->tk_rqstp;
+	struct rpc_xprt *xprt = req->rq_xprt;
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+
+	dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
+			task->tk_pid, req->rq_slen - req->rq_bytes_sent,
+			req->rq_slen);
+
+	/* Protect against races with write_space */
+	spin_lock_bh(&xprt->transport_lock);
+
+	/* Don't race with disconnect */
+	if (xprt_connected(xprt)) {
+		if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
+			/*
+			 * Notify TCP that we're limited by the application
+			 * window size
+			 */
+			set_bit(SOCK_NOSPACE, &transport->sock->flags);
+			transport->inet->sk_write_pending++;
+			/* ...and wait for more buffer space */
+			xprt_wait_for_buffer_space(task, xs_nospace_callback);
+		}
+	} else {
+		clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
+		task->tk_status = -ENOTCONN;
+	}
+
+	spin_unlock_bh(&xprt->transport_lock);
+}
+
+/**
+ * xs_udp_send_request - write an RPC request to a UDP socket
+ * @task: address of RPC task that manages the state of an RPC request
+ *
+ * Return values:
+ *        0:	The request has been sent
+ *   EAGAIN:	The socket was blocked, please call again later to
+ *		complete the request
+ * ENOTCONN:	Caller needs to invoke connect logic then call again
+ *    other:	Some other error occured, the request was not sent
+ */
+static int xs_udp_send_request(struct rpc_task *task)
+{
+	struct rpc_rqst *req = task->tk_rqstp;
+	struct rpc_xprt *xprt = req->rq_xprt;
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+	struct xdr_buf *xdr = &req->rq_snd_buf;
+	int status;
+
+	xs_pktdump("packet data:",
+				req->rq_svec->iov_base,
+				req->rq_svec->iov_len);
+
+	status = xs_sendpages(transport->sock,
+			      xs_addr(xprt),
+			      xprt->addrlen, xdr,
+			      req->rq_bytes_sent);
+
+	dprintk("RPC:       xs_udp_send_request(%u) = %d\n",
+			xdr->len - req->rq_bytes_sent, status);
+
+	if (status >= 0) {
+		task->tk_bytes_sent += status;
+		if (status >= req->rq_slen)
+			return 0;
+		/* Still some bytes left; set up for a retry later. */
+		status = -EAGAIN;
+	}
+
+	switch (status) {
+	case -EAGAIN:
+		xs_nospace(task);
+		break;
+	case -ENETUNREACH:
+	case -EPIPE:
+	case -ECONNREFUSED:
+		/* When the server has died, an ICMP port unreachable message
+		 * prompts ECONNREFUSED. */
+		clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
+		break;
+	default:
+		clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
+		dprintk("RPC:       sendmsg returned unrecognized error %d\n",
+			-status);
+	}
+
+	return status;
+}
+
+/**
+ * xs_tcp_shutdown - gracefully shut down a TCP socket
+ * @xprt: transport
+ *
+ * Initiates a graceful shutdown of the TCP socket by calling the
+ * equivalent of shutdown(SHUT_WR);
+ */
+static void xs_tcp_shutdown(struct rpc_xprt *xprt)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+	struct socket *sock = transport->sock;
+
+	if (sock != NULL)
+		kernel_sock_shutdown(sock, SHUT_WR);
+}
+
+static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
+{
+	u32 reclen = buf->len - sizeof(rpc_fraghdr);
+	rpc_fraghdr *base = buf->head[0].iov_base;
+	*base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
+}
+
+/**
+ * xs_tcp_send_request - write an RPC request to a TCP socket
+ * @task: address of RPC task that manages the state of an RPC request
+ *
+ * Return values:
+ *        0:	The request has been sent
+ *   EAGAIN:	The socket was blocked, please call again later to
+ *		complete the request
+ * ENOTCONN:	Caller needs to invoke connect logic then call again
+ *    other:	Some other error occured, the request was not sent
+ *
+ * XXX: In the case of soft timeouts, should we eventually give up
+ *	if sendmsg is not able to make progress?
+ */
+static int xs_tcp_send_request(struct rpc_task *task)
+{
+	struct rpc_rqst *req = task->tk_rqstp;
+	struct rpc_xprt *xprt = req->rq_xprt;
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+	struct xdr_buf *xdr = &req->rq_snd_buf;
+	int status;
+
+	xs_encode_tcp_record_marker(&req->rq_snd_buf);
+
+	xs_pktdump("packet data:",
+				req->rq_svec->iov_base,
+				req->rq_svec->iov_len);
+
+	/* Continue transmitting the packet/record. We must be careful
+	 * to cope with writespace callbacks arriving _after_ we have
+	 * called sendmsg(). */
+	while (1) {
+		status = xs_sendpages(transport->sock,
+					NULL, 0, xdr, req->rq_bytes_sent);
+
+		dprintk("RPC:       xs_tcp_send_request(%u) = %d\n",
+				xdr->len - req->rq_bytes_sent, status);
+
+		if (unlikely(status < 0))
+			break;
+
+		/* If we've sent the entire packet, immediately
+		 * reset the count of bytes sent. */
+		req->rq_bytes_sent += status;
+		task->tk_bytes_sent += status;
+		if (likely(req->rq_bytes_sent >= req->rq_slen)) {
+			req->rq_bytes_sent = 0;
+			return 0;
+		}
+
+		if (status != 0)
+			continue;
+		status = -EAGAIN;
+		break;
+	}
+
+	switch (status) {
+	case -EAGAIN:
+		xs_nospace(task);
+		break;
+	case -ECONNRESET:
+		xs_tcp_shutdown(xprt);
+	case -ECONNREFUSED:
+	case -ENOTCONN:
+	case -EPIPE:
+		status = -ENOTCONN;
+		clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
+		break;
+	default:
+		dprintk("RPC:       sendmsg returned unrecognized error %d\n",
+			-status);
+		clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
+		xs_tcp_shutdown(xprt);
+	}
+
+	return status;
+}
+
+/**
+ * xs_tcp_release_xprt - clean up after a tcp transmission
+ * @xprt: transport
+ * @task: rpc task
+ *
+ * This cleans up if an error causes us to abort the transmission of a request.
+ * In this case, the socket may need to be reset in order to avoid confusing
+ * the server.
+ */
+static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
+{
+	struct rpc_rqst *req;
+
+	if (task != xprt->snd_task)
+		return;
+	if (task == NULL)
+		goto out_release;
+	req = task->tk_rqstp;
+	if (req->rq_bytes_sent == 0)
+		goto out_release;
+	if (req->rq_bytes_sent == req->rq_snd_buf.len)
+		goto out_release;
+	set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
+out_release:
+	xprt_release_xprt(xprt, task);
+}
+
+static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
+{
+	transport->old_data_ready = sk->sk_data_ready;
+	transport->old_state_change = sk->sk_state_change;
+	transport->old_write_space = sk->sk_write_space;
+	transport->old_error_report = sk->sk_error_report;
+}
+
+static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
+{
+	sk->sk_data_ready = transport->old_data_ready;
+	sk->sk_state_change = transport->old_state_change;
+	sk->sk_write_space = transport->old_write_space;
+	sk->sk_error_report = transport->old_error_report;
+}
+
+/**
+ * xs_close - close a socket
+ * @xprt: transport
+ *
+ * This is used when all requests are complete; ie, no DRC state remains
+ * on the server we want to save.
+ */
+static void xs_close(struct rpc_xprt *xprt)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+	struct socket *sock = transport->sock;
+	struct sock *sk = transport->inet;
+
+	if (!sk)
+		goto clear_close_wait;
+
+	dprintk("RPC:       xs_close xprt %p\n", xprt);
+
+	write_lock_bh(&sk->sk_callback_lock);
+	transport->inet = NULL;
+	transport->sock = NULL;
+
+	sk->sk_user_data = NULL;
+
+	xs_restore_old_callbacks(transport, sk);
+	write_unlock_bh(&sk->sk_callback_lock);
+
+	sk->sk_no_check = 0;
+
+	sock_release(sock);
+clear_close_wait:
+	smp_mb__before_clear_bit();
+	clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
+	clear_bit(XPRT_CLOSING, &xprt->state);
+	smp_mb__after_clear_bit();
+	xprt_disconnect_done(xprt);
+}
+
+/**
+ * xs_destroy - prepare to shutdown a transport
+ * @xprt: doomed transport
+ *
+ */
+static void xs_destroy(struct rpc_xprt *xprt)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+
+	dprintk("RPC:       xs_destroy xprt %p\n", xprt);
+
+	cancel_rearming_delayed_work(&transport->connect_worker);
+
+	xs_close(xprt);
+	xs_free_peer_addresses(xprt);
+	kfree(xprt->slot);
+	kfree(xprt);
+	module_put(THIS_MODULE);
+}
+
+static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
+{
+	return (struct rpc_xprt *) sk->sk_user_data;
+}
+
+/**
+ * xs_udp_data_ready - "data ready" callback for UDP sockets
+ * @sk: socket with data to read
+ * @len: how much data to read
+ *
+ */
+static void xs_udp_data_ready(struct sock *sk, int len)
+{
+	struct rpc_task *task;
+	struct rpc_xprt *xprt;
+	struct rpc_rqst *rovr;
+	struct sk_buff *skb;
+	int err, repsize, copied;
+	u32 _xid;
+	__be32 *xp;
+
+	read_lock(&sk->sk_callback_lock);
+	dprintk("RPC:       xs_udp_data_ready...\n");
+	if (!(xprt = xprt_from_sock(sk)))
+		goto out;
+
+	if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
+		goto out;
+
+	if (xprt->shutdown)
+		goto dropit;
+
+	repsize = skb->len - sizeof(struct udphdr);
+	if (repsize < 4) {
+		dprintk("RPC:       impossible RPC reply size %d!\n", repsize);
+		goto dropit;
+	}
+
+	/* Copy the XID from the skb... */
+	xp = skb_header_pointer(skb, sizeof(struct udphdr),
+				sizeof(_xid), &_xid);
+	if (xp == NULL)
+		goto dropit;
+
+	/* Look up and lock the request corresponding to the given XID */
+	spin_lock(&xprt->transport_lock);
+	rovr = xprt_lookup_rqst(xprt, *xp);
+	if (!rovr)
+		goto out_unlock;
+	task = rovr->rq_task;
+
+	if ((copied = rovr->rq_private_buf.buflen) > repsize)
+		copied = repsize;
+
+	/* Suck it into the iovec, verify checksum if not done by hw. */
+	if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
+		UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
+		goto out_unlock;
+	}
+
+	UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
+
+	/* Something worked... */
+	dst_confirm(skb->dst);
+
+	xprt_adjust_cwnd(task, copied);
+	xprt_update_rtt(task);
+	xprt_complete_rqst(task, copied);
+
+ out_unlock:
+	spin_unlock(&xprt->transport_lock);
+ dropit:
+	skb_free_datagram(sk, skb);
+ out:
+	read_unlock(&sk->sk_callback_lock);
+}
+
+static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+	size_t len, used;
+	char *p;
+
+	p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
+	len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
+	used = xdr_skb_read_bits(desc, p, len);
+	transport->tcp_offset += used;
+	if (used != len)
+		return;
+
+	transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
+	if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
+		transport->tcp_flags |= TCP_RCV_LAST_FRAG;
+	else
+		transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
+	transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
+
+	transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
+	transport->tcp_offset = 0;
+
+	/* Sanity check of the record length */
+	if (unlikely(transport->tcp_reclen < 4)) {
+		dprintk("RPC:       invalid TCP record fragment length\n");
+		xprt_force_disconnect(xprt);
+		return;
+	}
+	dprintk("RPC:       reading TCP record fragment of length %d\n",
+			transport->tcp_reclen);
+}
+
+static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
+{
+	if (transport->tcp_offset == transport->tcp_reclen) {
+		transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
+		transport->tcp_offset = 0;
+		if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
+			transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
+			transport->tcp_flags |= TCP_RCV_COPY_XID;
+			transport->tcp_copied = 0;
+		}
+	}
+}
+
+static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
+{
+	size_t len, used;
+	char *p;
+
+	len = sizeof(transport->tcp_xid) - transport->tcp_offset;
+	dprintk("RPC:       reading XID (%Zu bytes)\n", len);
+	p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
+	used = xdr_skb_read_bits(desc, p, len);
+	transport->tcp_offset += used;
+	if (used != len)
+		return;
+	transport->tcp_flags &= ~TCP_RCV_COPY_XID;
+	transport->tcp_flags |= TCP_RCV_COPY_DATA;
+	transport->tcp_copied = 4;
+	dprintk("RPC:       reading reply for XID %08x\n",
+			ntohl(transport->tcp_xid));
+	xs_tcp_check_fraghdr(transport);
+}
+
+static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+	struct rpc_rqst *req;
+	struct xdr_buf *rcvbuf;
+	size_t len;
+	ssize_t r;
+
+	/* Find and lock the request corresponding to this xid */
+	spin_lock(&xprt->transport_lock);
+	req = xprt_lookup_rqst(xprt, transport->tcp_xid);
+	if (!req) {
+		transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
+		dprintk("RPC:       XID %08x request not found!\n",
+				ntohl(transport->tcp_xid));
+		spin_unlock(&xprt->transport_lock);
+		return;
+	}
+
+	rcvbuf = &req->rq_private_buf;
+	len = desc->count;
+	if (len > transport->tcp_reclen - transport->tcp_offset) {
+		struct xdr_skb_reader my_desc;
+
+		len = transport->tcp_reclen - transport->tcp_offset;
+		memcpy(&my_desc, desc, sizeof(my_desc));
+		my_desc.count = len;
+		r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
+					  &my_desc, xdr_skb_read_bits);
+		desc->count -= r;
+		desc->offset += r;
+	} else
+		r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
+					  desc, xdr_skb_read_bits);
+
+	if (r > 0) {
+		transport->tcp_copied += r;
+		transport->tcp_offset += r;
+	}
+	if (r != len) {
+		/* Error when copying to the receive buffer,
+		 * usually because we weren't able to allocate
+		 * additional buffer pages. All we can do now
+		 * is turn off TCP_RCV_COPY_DATA, so the request
+		 * will not receive any additional updates,
+		 * and time out.
+		 * Any remaining data from this record will
+		 * be discarded.
+		 */
+		transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
+		dprintk("RPC:       XID %08x truncated request\n",
+				ntohl(transport->tcp_xid));
+		dprintk("RPC:       xprt = %p, tcp_copied = %lu, "
+				"tcp_offset = %u, tcp_reclen = %u\n",
+				xprt, transport->tcp_copied,
+				transport->tcp_offset, transport->tcp_reclen);
+		goto out;
+	}
+
+	dprintk("RPC:       XID %08x read %Zd bytes\n",
+			ntohl(transport->tcp_xid), r);
+	dprintk("RPC:       xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
+			"tcp_reclen = %u\n", xprt, transport->tcp_copied,
+			transport->tcp_offset, transport->tcp_reclen);
+
+	if (transport->tcp_copied == req->rq_private_buf.buflen)
+		transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
+	else if (transport->tcp_offset == transport->tcp_reclen) {
+		if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
+			transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
+	}
+
+out:
+	if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
+		xprt_complete_rqst(req->rq_task, transport->tcp_copied);
+	spin_unlock(&xprt->transport_lock);
+	xs_tcp_check_fraghdr(transport);
+}
+
+static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
+{
+	size_t len;
+
+	len = transport->tcp_reclen - transport->tcp_offset;
+	if (len > desc->count)
+		len = desc->count;
+	desc->count -= len;
+	desc->offset += len;
+	transport->tcp_offset += len;
+	dprintk("RPC:       discarded %Zu bytes\n", len);
+	xs_tcp_check_fraghdr(transport);
+}
+
+static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
+{
+	struct rpc_xprt *xprt = rd_desc->arg.data;
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+	struct xdr_skb_reader desc = {
+		.skb	= skb,
+		.offset	= offset,
+		.count	= len,
+	};
+
+	dprintk("RPC:       xs_tcp_data_recv started\n");
+	do {
+		/* Read in a new fragment marker if necessary */
+		/* Can we ever really expect to get completely empty fragments? */
+		if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
+			xs_tcp_read_fraghdr(xprt, &desc);
+			continue;
+		}
+		/* Read in the xid if necessary */
+		if (transport->tcp_flags & TCP_RCV_COPY_XID) {
+			xs_tcp_read_xid(transport, &desc);
+			continue;
+		}
+		/* Read in the request data */
+		if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
+			xs_tcp_read_request(xprt, &desc);
+			continue;
+		}
+		/* Skip over any trailing bytes on short reads */
+		xs_tcp_read_discard(transport, &desc);
+	} while (desc.count);
+	dprintk("RPC:       xs_tcp_data_recv done\n");
+	return len - desc.count;
+}
+
+/**
+ * xs_tcp_data_ready - "data ready" callback for TCP sockets
+ * @sk: socket with data to read
+ * @bytes: how much data to read
+ *
+ */
+static void xs_tcp_data_ready(struct sock *sk, int bytes)
+{
+	struct rpc_xprt *xprt;
+	read_descriptor_t rd_desc;
+	int read;
+
+	dprintk("RPC:       xs_tcp_data_ready...\n");
+
+	read_lock(&sk->sk_callback_lock);
+	if (!(xprt = xprt_from_sock(sk)))
+		goto out;
+	if (xprt->shutdown)
+		goto out;
+
+	/* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
+	rd_desc.arg.data = xprt;
+	do {
+		rd_desc.count = 65536;
+		read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
+	} while (read > 0);
+out:
+	read_unlock(&sk->sk_callback_lock);
+}
+
+/**
+ * xs_tcp_state_change - callback to handle TCP socket state changes
+ * @sk: socket whose state has changed
+ *
+ */
+static void xs_tcp_state_change(struct sock *sk)
+{
+	struct rpc_xprt *xprt;
+
+	read_lock(&sk->sk_callback_lock);
+	if (!(xprt = xprt_from_sock(sk)))
+		goto out;
+	dprintk("RPC:       xs_tcp_state_change client %p...\n", xprt);
+	dprintk("RPC:       state %x conn %d dead %d zapped %d\n",
+			sk->sk_state, xprt_connected(xprt),
+			sock_flag(sk, SOCK_DEAD),
+			sock_flag(sk, SOCK_ZAPPED));
+
+	switch (sk->sk_state) {
+	case TCP_ESTABLISHED:
+		spin_lock_bh(&xprt->transport_lock);
+		if (!xprt_test_and_set_connected(xprt)) {
+			struct sock_xprt *transport = container_of(xprt,
+					struct sock_xprt, xprt);
+
+			/* Reset TCP record info */
+			transport->tcp_offset = 0;
+			transport->tcp_reclen = 0;
+			transport->tcp_copied = 0;
+			transport->tcp_flags =
+				TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
+
+			xprt_wake_pending_tasks(xprt, 0);
+		}
+		spin_unlock_bh(&xprt->transport_lock);
+		break;
+	case TCP_FIN_WAIT1:
+		/* The client initiated a shutdown of the socket */
+		xprt->connect_cookie++;
+		xprt->reestablish_timeout = 0;
+		set_bit(XPRT_CLOSING, &xprt->state);
+		smp_mb__before_clear_bit();
+		clear_bit(XPRT_CONNECTED, &xprt->state);
+		clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
+		smp_mb__after_clear_bit();
+		break;
+	case TCP_CLOSE_WAIT:
+		/* The server initiated a shutdown of the socket */
+		set_bit(XPRT_CLOSING, &xprt->state);
+		xprt_force_disconnect(xprt);
+	case TCP_SYN_SENT:
+		xprt->connect_cookie++;
+	case TCP_CLOSING:
+		/*
+		 * If the server closed down the connection, make sure that
+		 * we back off before reconnecting
+		 */
+		if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
+			xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
+		break;
+	case TCP_LAST_ACK:
+		smp_mb__before_clear_bit();
+		clear_bit(XPRT_CONNECTED, &xprt->state);
+		smp_mb__after_clear_bit();
+		break;
+	case TCP_CLOSE:
+		smp_mb__before_clear_bit();
+		clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
+		clear_bit(XPRT_CLOSING, &xprt->state);
+		smp_mb__after_clear_bit();
+		/* Mark transport as closed and wake up all pending tasks */
+		xprt_disconnect_done(xprt);
+	}
+ out:
+	read_unlock(&sk->sk_callback_lock);
+}
+
+/**
+ * xs_tcp_error_report - callback mainly for catching RST events
+ * @sk: socket
+ */
+static void xs_tcp_error_report(struct sock *sk)
+{
+	struct rpc_xprt *xprt;
+
+	read_lock(&sk->sk_callback_lock);
+	if (sk->sk_err != ECONNRESET || sk->sk_state != TCP_ESTABLISHED)
+		goto out;
+	if (!(xprt = xprt_from_sock(sk)))
+		goto out;
+	dprintk("RPC:       %s client %p...\n"
+			"RPC:       error %d\n",
+			__func__, xprt, sk->sk_err);
+
+	xprt_force_disconnect(xprt);
+out:
+	read_unlock(&sk->sk_callback_lock);
+}
+
+/**
+ * xs_udp_write_space - callback invoked when socket buffer space
+ *                             becomes available
+ * @sk: socket whose state has changed
+ *
+ * Called when more output buffer space is available for this socket.
+ * We try not to wake our writers until they can make "significant"
+ * progress, otherwise we'll waste resources thrashing kernel_sendmsg
+ * with a bunch of small requests.
+ */
+static void xs_udp_write_space(struct sock *sk)
+{
+	read_lock(&sk->sk_callback_lock);
+
+	/* from net/core/sock.c:sock_def_write_space */
+	if (sock_writeable(sk)) {
+		struct socket *sock;
+		struct rpc_xprt *xprt;
+
+		if (unlikely(!(sock = sk->sk_socket)))
+			goto out;
+		clear_bit(SOCK_NOSPACE, &sock->flags);
+
+		if (unlikely(!(xprt = xprt_from_sock(sk))))
+			goto out;
+		if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
+			goto out;
+
+		xprt_write_space(xprt);
+	}
+
+ out:
+	read_unlock(&sk->sk_callback_lock);
+}
+
+/**
+ * xs_tcp_write_space - callback invoked when socket buffer space
+ *                             becomes available
+ * @sk: socket whose state has changed
+ *
+ * Called when more output buffer space is available for this socket.
+ * We try not to wake our writers until they can make "significant"
+ * progress, otherwise we'll waste resources thrashing kernel_sendmsg
+ * with a bunch of small requests.
+ */
+static void xs_tcp_write_space(struct sock *sk)
+{
+	read_lock(&sk->sk_callback_lock);
+
+	/* from net/core/stream.c:sk_stream_write_space */
+	if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
+		struct socket *sock;
+		struct rpc_xprt *xprt;
+
+		if (unlikely(!(sock = sk->sk_socket)))
+			goto out;
+		clear_bit(SOCK_NOSPACE, &sock->flags);
+
+		if (unlikely(!(xprt = xprt_from_sock(sk))))
+			goto out;
+		if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
+			goto out;
+
+		xprt_write_space(xprt);
+	}
+
+ out:
+	read_unlock(&sk->sk_callback_lock);
+}
+
+static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+	struct sock *sk = transport->inet;
+
+	if (transport->rcvsize) {
+		sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
+		sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
+	}
+	if (transport->sndsize) {
+		sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
+		sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
+		sk->sk_write_space(sk);
+	}
+}
+
+/**
+ * xs_udp_set_buffer_size - set send and receive limits
+ * @xprt: generic transport
+ * @sndsize: requested size of send buffer, in bytes
+ * @rcvsize: requested size of receive buffer, in bytes
+ *
+ * Set socket send and receive buffer size limits.
+ */
+static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+
+	transport->sndsize = 0;
+	if (sndsize)
+		transport->sndsize = sndsize + 1024;
+	transport->rcvsize = 0;
+	if (rcvsize)
+		transport->rcvsize = rcvsize + 1024;
+
+	xs_udp_do_set_buffer_size(xprt);
+}
+
+/**
+ * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
+ * @task: task that timed out
+ *
+ * Adjust the congestion window after a retransmit timeout has occurred.
+ */
+static void xs_udp_timer(struct rpc_task *task)
+{
+	xprt_adjust_cwnd(task, -ETIMEDOUT);
+}
+
+static unsigned short xs_get_random_port(void)
+{
+	unsigned short range = xprt_max_resvport - xprt_min_resvport;
+	unsigned short rand = (unsigned short) net_random() % range;
+	return rand + xprt_min_resvport;
+}
+
+/**
+ * xs_set_port - reset the port number in the remote endpoint address
+ * @xprt: generic transport
+ * @port: new port number
+ *
+ */
+static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
+{
+	struct sockaddr *addr = xs_addr(xprt);
+
+	dprintk("RPC:       setting port for xprt %p to %u\n", xprt, port);
+
+	switch (addr->sa_family) {
+	case AF_INET:
+		((struct sockaddr_in *)addr)->sin_port = htons(port);
+		break;
+	case AF_INET6:
+		((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
+		break;
+	default:
+		BUG();
+	}
+}
+
+static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
+{
+	unsigned short port = transport->port;
+
+	if (port == 0 && transport->xprt.resvport)
+		port = xs_get_random_port();
+	return port;
+}
+
+static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
+{
+	if (transport->port != 0)
+		transport->port = 0;
+	if (!transport->xprt.resvport)
+		return 0;
+	if (port <= xprt_min_resvport || port > xprt_max_resvport)
+		return xprt_max_resvport;
+	return --port;
+}
+
+static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
+{
+	struct sockaddr_in myaddr = {
+		.sin_family = AF_INET,
+	};
+	struct sockaddr_in *sa;
+	int err, nloop = 0;
+	unsigned short port = xs_get_srcport(transport, sock);
+	unsigned short last;
+
+	sa = (struct sockaddr_in *)&transport->addr;
+	myaddr.sin_addr = sa->sin_addr;
+	do {
+		myaddr.sin_port = htons(port);
+		err = kernel_bind(sock, (struct sockaddr *) &myaddr,
+						sizeof(myaddr));
+		if (port == 0)
+			break;
+		if (err == 0) {
+			transport->port = port;
+			break;
+		}
+		last = port;
+		port = xs_next_srcport(transport, sock, port);
+		if (port > last)
+			nloop++;
+	} while (err == -EADDRINUSE && nloop != 2);
+	dprintk("RPC:       %s "NIPQUAD_FMT":%u: %s (%d)\n",
+			__func__, NIPQUAD(myaddr.sin_addr),
+			port, err ? "failed" : "ok", err);
+	return err;
+}
+
+static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
+{
+	struct sockaddr_in6 myaddr = {
+		.sin6_family = AF_INET6,
+	};
+	struct sockaddr_in6 *sa;
+	int err, nloop = 0;
+	unsigned short port = xs_get_srcport(transport, sock);
+	unsigned short last;
+
+	sa = (struct sockaddr_in6 *)&transport->addr;
+	myaddr.sin6_addr = sa->sin6_addr;
+	do {
+		myaddr.sin6_port = htons(port);
+		err = kernel_bind(sock, (struct sockaddr *) &myaddr,
+						sizeof(myaddr));
+		if (port == 0)
+			break;
+		if (err == 0) {
+			transport->port = port;
+			break;
+		}
+		last = port;
+		port = xs_next_srcport(transport, sock, port);
+		if (port > last)
+			nloop++;
+	} while (err == -EADDRINUSE && nloop != 2);
+	dprintk("RPC:       xs_bind6 "NIP6_FMT":%u: %s (%d)\n",
+		NIP6(myaddr.sin6_addr), port, err ? "failed" : "ok", err);
+	return err;
+}
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+static struct lock_class_key xs_key[2];
+static struct lock_class_key xs_slock_key[2];
+
+static inline void xs_reclassify_socket4(struct socket *sock)
+{
+	struct sock *sk = sock->sk;
+
+	BUG_ON(sock_owned_by_user(sk));
+	sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
+		&xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
+}
+
+static inline void xs_reclassify_socket6(struct socket *sock)
+{
+	struct sock *sk = sock->sk;
+
+	BUG_ON(sock_owned_by_user(sk));
+	sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
+		&xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
+}
+#else
+static inline void xs_reclassify_socket4(struct socket *sock)
+{
+}
+
+static inline void xs_reclassify_socket6(struct socket *sock)
+{
+}
+#endif
+
+static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+
+	if (!transport->inet) {
+		struct sock *sk = sock->sk;
+
+		write_lock_bh(&sk->sk_callback_lock);
+
+		xs_save_old_callbacks(transport, sk);
+
+		sk->sk_user_data = xprt;
+		sk->sk_data_ready = xs_udp_data_ready;
+		sk->sk_write_space = xs_udp_write_space;
+		sk->sk_no_check = UDP_CSUM_NORCV;
+		sk->sk_allocation = GFP_ATOMIC;
+
+		xprt_set_connected(xprt);
+
+		/* Reset to new socket */
+		transport->sock = sock;
+		transport->inet = sk;
+
+		write_unlock_bh(&sk->sk_callback_lock);
+	}
+	xs_udp_do_set_buffer_size(xprt);
+}
+
+/**
+ * xs_udp_connect_worker4 - set up a UDP socket
+ * @work: RPC transport to connect
+ *
+ * Invoked by a work queue tasklet.
+ */
+static void xs_udp_connect_worker4(struct work_struct *work)
+{
+	struct sock_xprt *transport =
+		container_of(work, struct sock_xprt, connect_worker.work);
+	struct rpc_xprt *xprt = &transport->xprt;
+	struct socket *sock = transport->sock;
+	int err, status = -EIO;
+
+	if (xprt->shutdown || !xprt_bound(xprt))
+		goto out;
+
+	/* Start by resetting any existing state */
+	xs_close(xprt);
+
+	if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
+		dprintk("RPC:       can't create UDP transport socket (%d).\n", -err);
+		goto out;
+	}
+	xs_reclassify_socket4(sock);
+
+	if (xs_bind4(transport, sock)) {
+		sock_release(sock);
+		goto out;
+	}
+
+	dprintk("RPC:       worker connecting xprt %p to address: %s\n",
+			xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
+
+	xs_udp_finish_connecting(xprt, sock);
+	status = 0;
+out:
+	xprt_wake_pending_tasks(xprt, status);
+	xprt_clear_connecting(xprt);
+}
+
+/**
+ * xs_udp_connect_worker6 - set up a UDP socket
+ * @work: RPC transport to connect
+ *
+ * Invoked by a work queue tasklet.
+ */
+static void xs_udp_connect_worker6(struct work_struct *work)
+{
+	struct sock_xprt *transport =
+		container_of(work, struct sock_xprt, connect_worker.work);
+	struct rpc_xprt *xprt = &transport->xprt;
+	struct socket *sock = transport->sock;
+	int err, status = -EIO;
+
+	if (xprt->shutdown || !xprt_bound(xprt))
+		goto out;
+
+	/* Start by resetting any existing state */
+	xs_close(xprt);
+
+	if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
+		dprintk("RPC:       can't create UDP transport socket (%d).\n", -err);
+		goto out;
+	}
+	xs_reclassify_socket6(sock);
+
+	if (xs_bind6(transport, sock) < 0) {
+		sock_release(sock);
+		goto out;
+	}
+
+	dprintk("RPC:       worker connecting xprt %p to address: %s\n",
+			xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
+
+	xs_udp_finish_connecting(xprt, sock);
+	status = 0;
+out:
+	xprt_wake_pending_tasks(xprt, status);
+	xprt_clear_connecting(xprt);
+}
+
+/*
+ * We need to preserve the port number so the reply cache on the server can
+ * find our cached RPC replies when we get around to reconnecting.
+ */
+static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
+{
+	int result;
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+	struct sockaddr any;
+
+	dprintk("RPC:       disconnecting xprt %p to reuse port\n", xprt);
+
+	/*
+	 * Disconnect the transport socket by doing a connect operation
+	 * with AF_UNSPEC.  This should return immediately...
+	 */
+	memset(&any, 0, sizeof(any));
+	any.sa_family = AF_UNSPEC;
+	result = kernel_connect(transport->sock, &any, sizeof(any), 0);
+	if (result)
+		dprintk("RPC:       AF_UNSPEC connect return code %d\n",
+				result);
+}
+
+static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+
+	if (!transport->inet) {
+		struct sock *sk = sock->sk;
+
+		write_lock_bh(&sk->sk_callback_lock);
+
+		xs_save_old_callbacks(transport, sk);
+
+		sk->sk_user_data = xprt;
+		sk->sk_data_ready = xs_tcp_data_ready;
+		sk->sk_state_change = xs_tcp_state_change;
+		sk->sk_write_space = xs_tcp_write_space;
+		sk->sk_error_report = xs_tcp_error_report;
+		sk->sk_allocation = GFP_ATOMIC;
+
+		/* socket options */
+		sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
+		sock_reset_flag(sk, SOCK_LINGER);
+		tcp_sk(sk)->linger2 = 0;
+		tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
+
+		xprt_clear_connected(xprt);
+
+		/* Reset to new socket */
+		transport->sock = sock;
+		transport->inet = sk;
+
+		write_unlock_bh(&sk->sk_callback_lock);
+	}
+
+	/* Tell the socket layer to start connecting... */
+	xprt->stat.connect_count++;
+	xprt->stat.connect_start = jiffies;
+	return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
+}
+
+/**
+ * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
+ * @work: RPC transport to connect
+ *
+ * Invoked by a work queue tasklet.
+ */
+static void xs_tcp_connect_worker4(struct work_struct *work)
+{
+	struct sock_xprt *transport =
+		container_of(work, struct sock_xprt, connect_worker.work);
+	struct rpc_xprt *xprt = &transport->xprt;
+	struct socket *sock = transport->sock;
+	int err, status = -EIO;
+
+	if (xprt->shutdown || !xprt_bound(xprt))
+		goto out;
+
+	if (!sock) {
+		/* start from scratch */
+		if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
+			dprintk("RPC:       can't create TCP transport socket (%d).\n", -err);
+			goto out;
+		}
+		xs_reclassify_socket4(sock);
+
+		if (xs_bind4(transport, sock) < 0) {
+			sock_release(sock);
+			goto out;
+		}
+	} else
+		/* "close" the socket, preserving the local port */
+		xs_tcp_reuse_connection(xprt);
+
+	dprintk("RPC:       worker connecting xprt %p to address: %s\n",
+			xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
+
+	status = xs_tcp_finish_connecting(xprt, sock);
+	dprintk("RPC:       %p connect status %d connected %d sock state %d\n",
+			xprt, -status, xprt_connected(xprt),
+			sock->sk->sk_state);
+	if (status < 0) {
+		switch (status) {
+			case -EINPROGRESS:
+			case -EALREADY:
+				goto out_clear;
+			case -ECONNREFUSED:
+			case -ECONNRESET:
+				/* retry with existing socket, after a delay */
+				break;
+			default:
+				/* get rid of existing socket, and retry */
+				xs_tcp_shutdown(xprt);
+		}
+	}
+out:
+	xprt_wake_pending_tasks(xprt, status);
+out_clear:
+	xprt_clear_connecting(xprt);
+}
+
+/**
+ * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
+ * @work: RPC transport to connect
+ *
+ * Invoked by a work queue tasklet.
+ */
+static void xs_tcp_connect_worker6(struct work_struct *work)
+{
+	struct sock_xprt *transport =
+		container_of(work, struct sock_xprt, connect_worker.work);
+	struct rpc_xprt *xprt = &transport->xprt;
+	struct socket *sock = transport->sock;
+	int err, status = -EIO;
+
+	if (xprt->shutdown || !xprt_bound(xprt))
+		goto out;
+
+	if (!sock) {
+		/* start from scratch */
+		if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
+			dprintk("RPC:       can't create TCP transport socket (%d).\n", -err);
+			goto out;
+		}
+		xs_reclassify_socket6(sock);
+
+		if (xs_bind6(transport, sock) < 0) {
+			sock_release(sock);
+			goto out;
+		}
+	} else
+		/* "close" the socket, preserving the local port */
+		xs_tcp_reuse_connection(xprt);
+
+	dprintk("RPC:       worker connecting xprt %p to address: %s\n",
+			xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
+
+	status = xs_tcp_finish_connecting(xprt, sock);
+	dprintk("RPC:       %p connect status %d connected %d sock state %d\n",
+			xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
+	if (status < 0) {
+		switch (status) {
+			case -EINPROGRESS:
+			case -EALREADY:
+				goto out_clear;
+			case -ECONNREFUSED:
+			case -ECONNRESET:
+				/* retry with existing socket, after a delay */
+				break;
+			default:
+				/* get rid of existing socket, and retry */
+				xs_tcp_shutdown(xprt);
+		}
+	}
+out:
+	xprt_wake_pending_tasks(xprt, status);
+out_clear:
+	xprt_clear_connecting(xprt);
+}
+
+/**
+ * xs_connect - connect a socket to a remote endpoint
+ * @task: address of RPC task that manages state of connect request
+ *
+ * TCP: If the remote end dropped the connection, delay reconnecting.
+ *
+ * UDP socket connects are synchronous, but we use a work queue anyway
+ * to guarantee that even unprivileged user processes can set up a
+ * socket on a privileged port.
+ *
+ * If a UDP socket connect fails, the delay behavior here prevents
+ * retry floods (hard mounts).
+ */
+static void xs_connect(struct rpc_task *task)
+{
+	struct rpc_xprt *xprt = task->tk_xprt;
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+
+	if (xprt_test_and_set_connecting(xprt))
+		return;
+
+	if (transport->sock != NULL) {
+		dprintk("RPC:       xs_connect delayed xprt %p for %lu "
+				"seconds\n",
+				xprt, xprt->reestablish_timeout / HZ);
+		queue_delayed_work(rpciod_workqueue,
+				   &transport->connect_worker,
+				   xprt->reestablish_timeout);
+		xprt->reestablish_timeout <<= 1;
+		if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
+			xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
+	} else {
+		dprintk("RPC:       xs_connect scheduled xprt %p\n", xprt);
+		queue_delayed_work(rpciod_workqueue,
+				   &transport->connect_worker, 0);
+	}
+}
+
+static void xs_tcp_connect(struct rpc_task *task)
+{
+	struct rpc_xprt *xprt = task->tk_xprt;
+
+	/* Initiate graceful shutdown of the socket if not already done */
+	if (test_bit(XPRT_CONNECTED, &xprt->state))
+		xs_tcp_shutdown(xprt);
+	/* Exit if we need to wait for socket shutdown to complete */
+	if (test_bit(XPRT_CLOSING, &xprt->state))
+		return;
+	xs_connect(task);
+}
+
+/**
+ * xs_udp_print_stats - display UDP socket-specifc stats
+ * @xprt: rpc_xprt struct containing statistics
+ * @seq: output file
+ *
+ */
+static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+
+	seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
+			transport->port,
+			xprt->stat.bind_count,
+			xprt->stat.sends,
+			xprt->stat.recvs,
+			xprt->stat.bad_xids,
+			xprt->stat.req_u,
+			xprt->stat.bklog_u);
+}
+
+/**
+ * xs_tcp_print_stats - display TCP socket-specifc stats
+ * @xprt: rpc_xprt struct containing statistics
+ * @seq: output file
+ *
+ */
+static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
+{
+	struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
+	long idle_time = 0;
+
+	if (xprt_connected(xprt))
+		idle_time = (long)(jiffies - xprt->last_used) / HZ;
+
+	seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
+			transport->port,
+			xprt->stat.bind_count,
+			xprt->stat.connect_count,
+			xprt->stat.connect_time,
+			idle_time,
+			xprt->stat.sends,
+			xprt->stat.recvs,
+			xprt->stat.bad_xids,
+			xprt->stat.req_u,
+			xprt->stat.bklog_u);
+}
+
+static struct rpc_xprt_ops xs_udp_ops = {
+	.set_buffer_size	= xs_udp_set_buffer_size,
+	.reserve_xprt		= xprt_reserve_xprt_cong,
+	.release_xprt		= xprt_release_xprt_cong,
+	.rpcbind		= rpcb_getport_async,
+	.set_port		= xs_set_port,
+	.connect		= xs_connect,
+	.buf_alloc		= rpc_malloc,
+	.buf_free		= rpc_free,
+	.send_request		= xs_udp_send_request,
+	.set_retrans_timeout	= xprt_set_retrans_timeout_rtt,
+	.timer			= xs_udp_timer,
+	.release_request	= xprt_release_rqst_cong,
+	.close			= xs_close,
+	.destroy		= xs_destroy,
+	.print_stats		= xs_udp_print_stats,
+};
+
+static struct rpc_xprt_ops xs_tcp_ops = {
+	.reserve_xprt		= xprt_reserve_xprt,
+	.release_xprt		= xs_tcp_release_xprt,
+	.rpcbind		= rpcb_getport_async,
+	.set_port		= xs_set_port,
+	.connect		= xs_tcp_connect,
+	.buf_alloc		= rpc_malloc,
+	.buf_free		= rpc_free,
+	.send_request		= xs_tcp_send_request,
+	.set_retrans_timeout	= xprt_set_retrans_timeout_def,
+	.close			= xs_tcp_shutdown,
+	.destroy		= xs_destroy,
+	.print_stats		= xs_tcp_print_stats,
+};
+
+static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
+				      unsigned int slot_table_size)
+{
+	struct rpc_xprt *xprt;
+	struct sock_xprt *new;
+
+	if (args->addrlen > sizeof(xprt->addr)) {
+		dprintk("RPC:       xs_setup_xprt: address too large\n");
+		return ERR_PTR(-EBADF);
+	}
+
+	new = kzalloc(sizeof(*new), GFP_KERNEL);
+	if (new == NULL) {
+		dprintk("RPC:       xs_setup_xprt: couldn't allocate "
+				"rpc_xprt\n");
+		return ERR_PTR(-ENOMEM);
+	}
+	xprt = &new->xprt;
+
+	xprt->max_reqs = slot_table_size;
+	xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
+	if (xprt->slot == NULL) {
+		kfree(xprt);
+		dprintk("RPC:       xs_setup_xprt: couldn't allocate slot "
+				"table\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	memcpy(&xprt->addr, args->dstaddr, args->addrlen);
+	xprt->addrlen = args->addrlen;
+	if (args->srcaddr)
+		memcpy(&new->addr, args->srcaddr, args->addrlen);
+
+	return xprt;
+}
+
+static const struct rpc_timeout xs_udp_default_timeout = {
+	.to_initval = 5 * HZ,
+	.to_maxval = 30 * HZ,
+	.to_increment = 5 * HZ,
+	.to_retries = 5,
+};
+
+/**
+ * xs_setup_udp - Set up transport to use a UDP socket
+ * @args: rpc transport creation arguments
+ *
+ */
+static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
+{
+	struct sockaddr *addr = args->dstaddr;
+	struct rpc_xprt *xprt;
+	struct sock_xprt *transport;
+
+	xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
+	if (IS_ERR(xprt))
+		return xprt;
+	transport = container_of(xprt, struct sock_xprt, xprt);
+
+	xprt->prot = IPPROTO_UDP;
+	xprt->tsh_size = 0;
+	/* XXX: header size can vary due to auth type, IPv6, etc. */
+	xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
+
+	xprt->bind_timeout = XS_BIND_TO;
+	xprt->connect_timeout = XS_UDP_CONN_TO;
+	xprt->reestablish_timeout = XS_UDP_REEST_TO;
+	xprt->idle_timeout = XS_IDLE_DISC_TO;
+
+	xprt->ops = &xs_udp_ops;
+
+	xprt->timeout = &xs_udp_default_timeout;
+
+	switch (addr->sa_family) {
+	case AF_INET:
+		if (((struct sockaddr_in *)addr)->sin_port != htons(0))
+			xprt_set_bound(xprt);
+
+		INIT_DELAYED_WORK(&transport->connect_worker,
+					xs_udp_connect_worker4);
+		xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
+		break;
+	case AF_INET6:
+		if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
+			xprt_set_bound(xprt);
+
+		INIT_DELAYED_WORK(&transport->connect_worker,
+					xs_udp_connect_worker6);
+		xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
+		break;
+	default:
+		kfree(xprt);
+		return ERR_PTR(-EAFNOSUPPORT);
+	}
+
+	dprintk("RPC:       set up transport to address %s\n",
+			xprt->address_strings[RPC_DISPLAY_ALL]);
+
+	if (try_module_get(THIS_MODULE))
+		return xprt;
+
+	kfree(xprt->slot);
+	kfree(xprt);
+	return ERR_PTR(-EINVAL);
+}
+
+static const struct rpc_timeout xs_tcp_default_timeout = {
+	.to_initval = 60 * HZ,
+	.to_maxval = 60 * HZ,
+	.to_retries = 2,
+};
+
+/**
+ * xs_setup_tcp - Set up transport to use a TCP socket
+ * @args: rpc transport creation arguments
+ *
+ */
+static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
+{
+	struct sockaddr *addr = args->dstaddr;
+	struct rpc_xprt *xprt;
+	struct sock_xprt *transport;
+
+	xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
+	if (IS_ERR(xprt))
+		return xprt;
+	transport = container_of(xprt, struct sock_xprt, xprt);
+
+	xprt->prot = IPPROTO_TCP;
+	xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
+	xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
+
+	xprt->bind_timeout = XS_BIND_TO;
+	xprt->connect_timeout = XS_TCP_CONN_TO;
+	xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
+	xprt->idle_timeout = XS_IDLE_DISC_TO;
+
+	xprt->ops = &xs_tcp_ops;
+	xprt->timeout = &xs_tcp_default_timeout;
+
+	switch (addr->sa_family) {
+	case AF_INET:
+		if (((struct sockaddr_in *)addr)->sin_port != htons(0))
+			xprt_set_bound(xprt);
+
+		INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
+		xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
+		break;
+	case AF_INET6:
+		if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
+			xprt_set_bound(xprt);
+
+		INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
+		xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
+		break;
+	default:
+		kfree(xprt);
+		return ERR_PTR(-EAFNOSUPPORT);
+	}
+
+	dprintk("RPC:       set up transport to address %s\n",
+			xprt->address_strings[RPC_DISPLAY_ALL]);
+
+	if (try_module_get(THIS_MODULE))
+		return xprt;
+
+	kfree(xprt->slot);
+	kfree(xprt);
+	return ERR_PTR(-EINVAL);
+}
+
+static struct xprt_class	xs_udp_transport = {
+	.list		= LIST_HEAD_INIT(xs_udp_transport.list),
+	.name		= "udp",
+	.owner		= THIS_MODULE,
+	.ident		= IPPROTO_UDP,
+	.setup		= xs_setup_udp,
+};
+
+static struct xprt_class	xs_tcp_transport = {
+	.list		= LIST_HEAD_INIT(xs_tcp_transport.list),
+	.name		= "tcp",
+	.owner		= THIS_MODULE,
+	.ident		= IPPROTO_TCP,
+	.setup		= xs_setup_tcp,
+};
+
+/**
+ * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
+ *
+ */
+int init_socket_xprt(void)
+{
+#ifdef RPC_DEBUG
+	if (!sunrpc_table_header)
+		sunrpc_table_header = register_sysctl_table(sunrpc_table);
+#endif
+
+	xprt_register_transport(&xs_udp_transport);
+	xprt_register_transport(&xs_tcp_transport);
+
+	return 0;
+}
+
+/**
+ * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
+ *
+ */
+void cleanup_socket_xprt(void)
+{
+#ifdef RPC_DEBUG
+	if (sunrpc_table_header) {
+		unregister_sysctl_table(sunrpc_table_header);
+		sunrpc_table_header = NULL;
+	}
+#endif
+
+	xprt_unregister_transport(&xs_udp_transport);
+	xprt_unregister_transport(&xs_tcp_transport);
+}