BSD 4.4 Lite Kernel Sources

1 files changed, 1990 insertions, 0 deletions

diff --git a/sys/nfsclient/nfs_socket.c b/sys/nfsclient/nfs_socket.c
new file mode 100644
index 0000000..cf88ed3
--- /dev/null
+++ b/sys/nfsclient/nfs_socket.c
@@ -0,0 +1,1990 @@
+/*
+ * Copyright (c) 1989, 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Rick Macklem at The University of Guelph.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)nfs_socket.c	8.3 (Berkeley) 1/12/94
+ */
+
+/*
+ * Socket operations for use by nfs
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/mount.h>
+#include <sys/kernel.h>
+#include <sys/mbuf.h>
+#include <sys/vnode.h>
+#include <sys/domain.h>
+#include <sys/protosw.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/syslog.h>
+#include <sys/tprintf.h>
+
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <nfs/rpcv2.h>
+#include <nfs/nfsv2.h>
+#include <nfs/nfs.h>
+#include <nfs/xdr_subs.h>
+#include <nfs/nfsm_subs.h>
+#include <nfs/nfsmount.h>
+#include <nfs/nfsnode.h>
+#include <nfs/nfsrtt.h>
+#include <nfs/nqnfs.h>
+
+#define	TRUE	1
+#define	FALSE	0
+
+/*
+ * Estimate rto for an nfs rpc sent via. an unreliable datagram.
+ * Use the mean and mean deviation of rtt for the appropriate type of rpc
+ * for the frequent rpcs and a default for the others.
+ * The justification for doing "other" this way is that these rpcs
+ * happen so infrequently that timer est. would probably be stale.
+ * Also, since many of these rpcs are
+ * non-idempotent, a conservative timeout is desired.
+ * getattr, lookup - A+2D
+ * read, write     - A+4D
+ * other           - nm_timeo
+ */
+#define	NFS_RTO(n, t) \
+	((t) == 0 ? (n)->nm_timeo : \
+	 ((t) < 3 ? \
+	  (((((n)->nm_srtt[t-1] + 3) >> 2) + (n)->nm_sdrtt[t-1] + 1) >> 1) : \
+	  ((((n)->nm_srtt[t-1] + 7) >> 3) + (n)->nm_sdrtt[t-1] + 1)))
+#define	NFS_SRTT(r)	(r)->r_nmp->nm_srtt[proct[(r)->r_procnum] - 1]
+#define	NFS_SDRTT(r)	(r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum] - 1]
+/*
+ * External data, mostly RPC constants in XDR form
+ */
+extern u_long rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers, rpc_auth_unix,
+	rpc_msgaccepted, rpc_call, rpc_autherr, rpc_rejectedcred,
+	rpc_auth_kerb;
+extern u_long nfs_prog, nfs_vers, nqnfs_prog, nqnfs_vers;
+extern time_t nqnfsstarttime;
+extern int nonidempotent[NFS_NPROCS];
+
+/*
+ * Maps errno values to nfs error numbers.
+ * Use NFSERR_IO as the catch all for ones not specifically defined in
+ * RFC 1094.
+ */
+static int nfsrv_errmap[ELAST] = {
+  NFSERR_PERM,	NFSERR_NOENT,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,
+  NFSERR_NXIO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,
+  NFSERR_IO,	NFSERR_IO,	NFSERR_ACCES,	NFSERR_IO,	NFSERR_IO,
+  NFSERR_IO,	NFSERR_EXIST,	NFSERR_IO,	NFSERR_NODEV,	NFSERR_NOTDIR,
+  NFSERR_ISDIR,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,
+  NFSERR_IO,	NFSERR_FBIG,	NFSERR_NOSPC,	NFSERR_IO,	NFSERR_ROFS,
+  NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,
+  NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,
+  NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,
+  NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,
+  NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,
+  NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,
+  NFSERR_IO,	NFSERR_IO,	NFSERR_NAMETOL,	NFSERR_IO,	NFSERR_IO,
+  NFSERR_NOTEMPTY, NFSERR_IO,	NFSERR_IO,	NFSERR_DQUOT,	NFSERR_STALE,
+  NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,
+  NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,	NFSERR_IO,
+  NFSERR_IO,
+};
+
+/*
+ * Defines which timer to use for the procnum.
+ * 0 - default
+ * 1 - getattr
+ * 2 - lookup
+ * 3 - read
+ * 4 - write
+ */
+static int proct[NFS_NPROCS] = {
+	0, 1, 0, 0, 2, 3, 3, 0, 4, 0, 0, 0, 0, 0, 0, 0, 3, 0, 3, 0, 0, 0, 0,
+};
+
+/*
+ * There is a congestion window for outstanding rpcs maintained per mount
+ * point. The cwnd size is adjusted in roughly the way that:
+ * Van Jacobson, Congestion avoidance and Control, In "Proceedings of
+ * SIGCOMM '88". ACM, August 1988.
+ * describes for TCP. The cwnd size is chopped in half on a retransmit timeout
+ * and incremented by 1/cwnd when each rpc reply is received and a full cwnd
+ * of rpcs is in progress.
+ * (The sent count and cwnd are scaled for integer arith.)
+ * Variants of "slow start" were tried and were found to be too much of a
+ * performance hit (ave. rtt 3 times larger),
+ * I suspect due to the large rtt that nfs rpcs have.
+ */
+#define	NFS_CWNDSCALE	256
+#define	NFS_MAXCWND	(NFS_CWNDSCALE * 32)
+static int nfs_backoff[8] = { 2, 4, 8, 16, 32, 64, 128, 256, };
+int	nfs_sbwait();
+void	nfs_disconnect(), nfs_realign(), nfsrv_wakenfsd(), nfs_sndunlock();
+void	nfs_rcvunlock(), nqnfs_serverd(), nqnfs_clientlease();
+struct mbuf *nfsm_rpchead();
+int nfsrtton = 0;
+struct nfsrtt nfsrtt;
+struct nfsd nfsd_head;
+
+int	nfsrv_null(),
+	nfsrv_getattr(),
+	nfsrv_setattr(),
+	nfsrv_lookup(),
+	nfsrv_readlink(),
+	nfsrv_read(),
+	nfsrv_write(),
+	nfsrv_create(),
+	nfsrv_remove(),
+	nfsrv_rename(),
+	nfsrv_link(),
+	nfsrv_symlink(),
+	nfsrv_mkdir(),
+	nfsrv_rmdir(),
+	nfsrv_readdir(),
+	nfsrv_statfs(),
+	nfsrv_noop(),
+	nqnfsrv_readdirlook(),
+	nqnfsrv_getlease(),
+	nqnfsrv_vacated(),
+	nqnfsrv_access();
+
+int (*nfsrv_procs[NFS_NPROCS])() = {
+	nfsrv_null,
+	nfsrv_getattr,
+	nfsrv_setattr,
+	nfsrv_noop,
+	nfsrv_lookup,
+	nfsrv_readlink,
+	nfsrv_read,
+	nfsrv_noop,
+	nfsrv_write,
+	nfsrv_create,
+	nfsrv_remove,
+	nfsrv_rename,
+	nfsrv_link,
+	nfsrv_symlink,
+	nfsrv_mkdir,
+	nfsrv_rmdir,
+	nfsrv_readdir,
+	nfsrv_statfs,
+	nqnfsrv_readdirlook,
+	nqnfsrv_getlease,
+	nqnfsrv_vacated,
+	nfsrv_noop,
+	nqnfsrv_access,
+};
+
+struct nfsreq nfsreqh;
+
+/*
+ * Initialize sockets and congestion for a new NFS connection.
+ * We do not free the sockaddr if error.
+ */
+nfs_connect(nmp, rep)
+	register struct nfsmount *nmp;
+	struct nfsreq *rep;
+{
+	register struct socket *so;
+	int s, error, rcvreserve, sndreserve;
+	struct sockaddr *saddr;
+	struct sockaddr_in *sin;
+	struct mbuf *m;
+	u_short tport;
+
+	nmp->nm_so = (struct socket *)0;
+	saddr = mtod(nmp->nm_nam, struct sockaddr *);
+	if (error = socreate(saddr->sa_family,
+		&nmp->nm_so, nmp->nm_sotype, nmp->nm_soproto))
+		goto bad;
+	so = nmp->nm_so;
+	nmp->nm_soflags = so->so_proto->pr_flags;
+
+	/*
+	 * Some servers require that the client port be a reserved port number.
+	 */
+	if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) {
+		MGET(m, M_WAIT, MT_SONAME);
+		sin = mtod(m, struct sockaddr_in *);
+		sin->sin_len = m->m_len = sizeof (struct sockaddr_in);
+		sin->sin_family = AF_INET;
+		sin->sin_addr.s_addr = INADDR_ANY;
+		tport = IPPORT_RESERVED - 1;
+		sin->sin_port = htons(tport);
+		while ((error = sobind(so, m)) == EADDRINUSE &&
+		       --tport > IPPORT_RESERVED / 2)
+			sin->sin_port = htons(tport);
+		m_freem(m);
+		if (error)
+			goto bad;
+	}
+
+	/*
+	 * Protocols that do not require connections may be optionally left
+	 * unconnected for servers that reply from a port other than NFS_PORT.
+	 */
+	if (nmp->nm_flag & NFSMNT_NOCONN) {
+		if (nmp->nm_soflags & PR_CONNREQUIRED) {
+			error = ENOTCONN;
+			goto bad;
+		}
+	} else {
+		if (error = soconnect(so, nmp->nm_nam))
+			goto bad;
+
+		/*
+		 * Wait for the connection to complete. Cribbed from the
+		 * connect system call but with the wait timing out so
+		 * that interruptible mounts don't hang here for a long time.
+		 */
+		s = splnet();
+		while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
+			(void) tsleep((caddr_t)&so->so_timeo, PSOCK,
+				"nfscon", 2 * hz);
+			if ((so->so_state & SS_ISCONNECTING) &&
+			    so->so_error == 0 && rep &&
+			    (error = nfs_sigintr(nmp, rep, rep->r_procp))) {
+				so->so_state &= ~SS_ISCONNECTING;
+				splx(s);
+				goto bad;
+			}
+		}
+		if (so->so_error) {
+			error = so->so_error;
+			so->so_error = 0;
+			splx(s);
+			goto bad;
+		}
+		splx(s);
+	}
+	if (nmp->nm_flag & (NFSMNT_SOFT | NFSMNT_INT)) {
+		so->so_rcv.sb_timeo = (5 * hz);
+		so->so_snd.sb_timeo = (5 * hz);
+	} else {
+		so->so_rcv.sb_timeo = 0;
+		so->so_snd.sb_timeo = 0;
+	}
+	if (nmp->nm_sotype == SOCK_DGRAM) {
+		sndreserve = nmp->nm_wsize + NFS_MAXPKTHDR;
+		rcvreserve = nmp->nm_rsize + NFS_MAXPKTHDR;
+	} else if (nmp->nm_sotype == SOCK_SEQPACKET) {
+		sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2;
+		rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR) * 2;
+	} else {
+		if (nmp->nm_sotype != SOCK_STREAM)
+			panic("nfscon sotype");
+		if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
+			MGET(m, M_WAIT, MT_SOOPTS);
+			*mtod(m, int *) = 1;
+			m->m_len = sizeof(int);
+			sosetopt(so, SOL_SOCKET, SO_KEEPALIVE, m);
+		}
+		if (so->so_proto->pr_protocol == IPPROTO_TCP) {
+			MGET(m, M_WAIT, MT_SOOPTS);
+			*mtod(m, int *) = 1;
+			m->m_len = sizeof(int);
+			sosetopt(so, IPPROTO_TCP, TCP_NODELAY, m);
+		}
+		sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR + sizeof (u_long))
+				* 2;
+		rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR + sizeof (u_long))
+				* 2;
+	}
+	if (error = soreserve(so, sndreserve, rcvreserve))
+		goto bad;
+	so->so_rcv.sb_flags |= SB_NOINTR;
+	so->so_snd.sb_flags |= SB_NOINTR;
+
+	/* Initialize other non-zero congestion variables */
+	nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] = nmp->nm_srtt[3] =
+		nmp->nm_srtt[4] = (NFS_TIMEO << 3);
+	nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] =
+		nmp->nm_sdrtt[3] = nmp->nm_sdrtt[4] = 0;
+	nmp->nm_cwnd = NFS_MAXCWND / 2;	    /* Initial send window */
+	nmp->nm_sent = 0;
+	nmp->nm_timeouts = 0;
+	return (0);
+
+bad:
+	nfs_disconnect(nmp);
+	return (error);
+}
+
+/*
+ * Reconnect routine:
+ * Called when a connection is broken on a reliable protocol.
+ * - clean up the old socket
+ * - nfs_connect() again
+ * - set R_MUSTRESEND for all outstanding requests on mount point
+ * If this fails the mount point is DEAD!
+ * nb: Must be called with the nfs_sndlock() set on the mount point.
+ */
+nfs_reconnect(rep)
+	register struct nfsreq *rep;
+{
+	register struct nfsreq *rp;
+	register struct nfsmount *nmp = rep->r_nmp;
+	int error;
+
+	nfs_disconnect(nmp);
+	while (error = nfs_connect(nmp, rep)) {
+		if (error == EINTR || error == ERESTART)
+			return (EINTR);
+		(void) tsleep((caddr_t)&lbolt, PSOCK, "nfscon", 0);
+	}
+
+	/*
+	 * Loop through outstanding request list and fix up all requests
+	 * on old socket.
+	 */
+	rp = nfsreqh.r_next;
+	while (rp != &nfsreqh) {
+		if (rp->r_nmp == nmp)
+			rp->r_flags |= R_MUSTRESEND;
+		rp = rp->r_next;
+	}
+	return (0);
+}
+
+/*
+ * NFS disconnect. Clean up and unlink.
+ */
+void
+nfs_disconnect(nmp)
+	register struct nfsmount *nmp;
+{
+	register struct socket *so;
+
+	if (nmp->nm_so) {
+		so = nmp->nm_so;
+		nmp->nm_so = (struct socket *)0;
+		soshutdown(so, 2);
+		soclose(so);
+	}
+}
+
+/*
+ * This is the nfs send routine. For connection based socket types, it
+ * must be called with an nfs_sndlock() on the socket.
+ * "rep == NULL" indicates that it has been called from a server.
+ * For the client side:
+ * - return EINTR if the RPC is terminated, 0 otherwise
+ * - set R_MUSTRESEND if the send fails for any reason
+ * - do any cleanup required by recoverable socket errors (???)
+ * For the server side:
+ * - return EINTR or ERESTART if interrupted by a signal
+ * - return EPIPE if a connection is lost for connection based sockets (TCP...)
+ * - do any cleanup required by recoverable socket errors (???)
+ */
+nfs_send(so, nam, top, rep)
+	register struct socket *so;
+	struct mbuf *nam;
+	register struct mbuf *top;
+	struct nfsreq *rep;
+{
+	struct mbuf *sendnam;
+	int error, soflags, flags;
+
+	if (rep) {
+		if (rep->r_flags & R_SOFTTERM) {
+			m_freem(top);
+			return (EINTR);
+		}
+		if ((so = rep->r_nmp->nm_so) == NULL) {
+			rep->r_flags |= R_MUSTRESEND;
+			m_freem(top);
+			return (0);
+		}
+		rep->r_flags &= ~R_MUSTRESEND;
+		soflags = rep->r_nmp->nm_soflags;
+	} else
+		soflags = so->so_proto->pr_flags;
+	if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED))
+		sendnam = (struct mbuf *)0;
+	else
+		sendnam = nam;
+	if (so->so_type == SOCK_SEQPACKET)
+		flags = MSG_EOR;
+	else
+		flags = 0;
+
+	error = sosend(so, sendnam, (struct uio *)0, top,
+		(struct mbuf *)0, flags);
+	if (error) {
+		if (rep) {
+			log(LOG_INFO, "nfs send error %d for server %s\n",error,
+			    rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
+			/*
+			 * Deal with errors for the client side.
+			 */
+			if (rep->r_flags & R_SOFTTERM)
+				error = EINTR;
+			else
+				rep->r_flags |= R_MUSTRESEND;
+		} else
+			log(LOG_INFO, "nfsd send error %d\n", error);
+
+		/*
+		 * Handle any recoverable (soft) socket errors here. (???)
+		 */
+		if (error != EINTR && error != ERESTART &&
+			error != EWOULDBLOCK && error != EPIPE)
+			error = 0;
+	}
+	return (error);
+}
+
+/*
+ * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all
+ * done by soreceive(), but for SOCK_STREAM we must deal with the Record
+ * Mark and consolidate the data into a new mbuf list.
+ * nb: Sometimes TCP passes the data up to soreceive() in long lists of
+ *     small mbufs.
+ * For SOCK_STREAM we must be very careful to read an entire record once
+ * we have read any of it, even if the system call has been interrupted.
+ */
+nfs_receive(rep, aname, mp)
+	register struct nfsreq *rep;
+	struct mbuf **aname;
+	struct mbuf **mp;
+{
+	register struct socket *so;
+	struct uio auio;
+	struct iovec aio;
+	register struct mbuf *m;
+	struct mbuf *control;
+	u_long len;
+	struct mbuf **getnam;
+	int error, sotype, rcvflg;
+	struct proc *p = curproc;	/* XXX */
+
+	/*
+	 * Set up arguments for soreceive()
+	 */
+	*mp = (struct mbuf *)0;
+	*aname = (struct mbuf *)0;
+	sotype = rep->r_nmp->nm_sotype;
+
+	/*
+	 * For reliable protocols, lock against other senders/receivers
+	 * in case a reconnect is necessary.
+	 * For SOCK_STREAM, first get the Record Mark to find out how much
+	 * more there is to get.
+	 * We must lock the socket against other receivers
+	 * until we have an entire rpc request/reply.
+	 */
+	if (sotype != SOCK_DGRAM) {
+		if (error = nfs_sndlock(&rep->r_nmp->nm_flag, rep))
+			return (error);
+tryagain:
+		/*
+		 * Check for fatal errors and resending request.
+		 */
+		/*
+		 * Ugh: If a reconnect attempt just happened, nm_so
+		 * would have changed. NULL indicates a failed
+		 * attempt that has essentially shut down this
+		 * mount point.
+		 */
+		if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) {
+			nfs_sndunlock(&rep->r_nmp->nm_flag);
+			return (EINTR);
+		}
+		if ((so = rep->r_nmp->nm_so) == NULL) {
+			if (error = nfs_reconnect(rep)) {
+				nfs_sndunlock(&rep->r_nmp->nm_flag);
+				return (error);
+			}
+			goto tryagain;
+		}
+		while (rep->r_flags & R_MUSTRESEND) {
+			m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT);
+			nfsstats.rpcretries++;
+			if (error = nfs_send(so, rep->r_nmp->nm_nam, m, rep)) {
+				if (error == EINTR || error == ERESTART ||
+				    (error = nfs_reconnect(rep))) {
+					nfs_sndunlock(&rep->r_nmp->nm_flag);
+					return (error);
+				}
+				goto tryagain;
+			}
+		}
+		nfs_sndunlock(&rep->r_nmp->nm_flag);
+		if (sotype == SOCK_STREAM) {
+			aio.iov_base = (caddr_t) &len;
+			aio.iov_len = sizeof(u_long);
+			auio.uio_iov = &aio;
+			auio.uio_iovcnt = 1;
+			auio.uio_segflg = UIO_SYSSPACE;
+			auio.uio_rw = UIO_READ;
+			auio.uio_offset = 0;
+			auio.uio_resid = sizeof(u_long);
+			auio.uio_procp = p;
+			do {
+			   rcvflg = MSG_WAITALL;
+			   error = soreceive(so, (struct mbuf **)0, &auio,
+				(struct mbuf **)0, (struct mbuf **)0, &rcvflg);
+			   if (error == EWOULDBLOCK && rep) {
+				if (rep->r_flags & R_SOFTTERM)
+					return (EINTR);
+			   }
+			} while (error == EWOULDBLOCK);
+			if (!error && auio.uio_resid > 0) {
+			    log(LOG_INFO,
+				 "short receive (%d/%d) from nfs server %s\n",
+				 sizeof(u_long) - auio.uio_resid,
+				 sizeof(u_long),
+				 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
+			    error = EPIPE;
+			}
+			if (error)
+				goto errout;
+			len = ntohl(len) & ~0x80000000;
+			/*
+			 * This is SERIOUS! We are out of sync with the sender
+			 * and forcing a disconnect/reconnect is all I can do.
+			 */
+			if (len > NFS_MAXPACKET) {
+			    log(LOG_ERR, "%s (%d) from nfs server %s\n",
+				"impossible packet length",
+				len,
+				rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
+			    error = EFBIG;
+			    goto errout;
+			}
+			auio.uio_resid = len;
+			do {
+			    rcvflg = MSG_WAITALL;
+			    error =  soreceive(so, (struct mbuf **)0,
+				&auio, mp, (struct mbuf **)0, &rcvflg);
+			} while (error == EWOULDBLOCK || error == EINTR ||
+				 error == ERESTART);
+			if (!error && auio.uio_resid > 0) {
+			    log(LOG_INFO,
+				"short receive (%d/%d) from nfs server %s\n",
+				len - auio.uio_resid, len,
+				rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
+			    error = EPIPE;
+			}
+		} else {
+			/*
+			 * NB: Since uio_resid is big, MSG_WAITALL is ignored
+			 * and soreceive() will return when it has either a
+			 * control msg or a data msg.
+			 * We have no use for control msg., but must grab them
+			 * and then throw them away so we know what is going
+			 * on.
+			 */
+			auio.uio_resid = len = 100000000; /* Anything Big */
+			auio.uio_procp = p;
+			do {
+			    rcvflg = 0;
+			    error =  soreceive(so, (struct mbuf **)0,
+				&auio, mp, &control, &rcvflg);
+			    if (control)
+				m_freem(control);
+			    if (error == EWOULDBLOCK && rep) {
+				if (rep->r_flags & R_SOFTTERM)
+					return (EINTR);
+			    }
+			} while (error == EWOULDBLOCK ||
+				 (!error && *mp == NULL && control));
+			if ((rcvflg & MSG_EOR) == 0)
+				printf("Egad!!\n");
+			if (!error && *mp == NULL)
+				error = EPIPE;
+			len -= auio.uio_resid;
+		}
+errout:
+		if (error && error != EINTR && error != ERESTART) {
+			m_freem(*mp);
+			*mp = (struct mbuf *)0;
+			if (error != EPIPE)
+				log(LOG_INFO,
+				    "receive error %d from nfs server %s\n",
+				    error,
+				 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
+			error = nfs_sndlock(&rep->r_nmp->nm_flag, rep);
+			if (!error)
+				error = nfs_reconnect(rep);
+			if (!error)
+				goto tryagain;
+		}
+	} else {
+		if ((so = rep->r_nmp->nm_so) == NULL)
+			return (EACCES);
+		if (so->so_state & SS_ISCONNECTED)
+			getnam = (struct mbuf **)0;
+		else
+			getnam = aname;
+		auio.uio_resid = len = 1000000;
+		auio.uio_procp = p;
+		do {
+			rcvflg = 0;
+			error =  soreceive(so, getnam, &auio, mp,
+				(struct mbuf **)0, &rcvflg);
+			if (error == EWOULDBLOCK &&
+			    (rep->r_flags & R_SOFTTERM))
+				return (EINTR);
+		} while (error == EWOULDBLOCK);
+		len -= auio.uio_resid;
+	}
+	if (error) {
+		m_freem(*mp);
+		*mp = (struct mbuf *)0;
+	}
+	/*
+	 * Search for any mbufs that are not a multiple of 4 bytes long
+	 * or with m_data not longword aligned.
+	 * These could cause pointer alignment problems, so copy them to
+	 * well aligned mbufs.
+	 */
+	nfs_realign(*mp, 5 * NFSX_UNSIGNED);
+	return (error);
+}
+
+/*
+ * Implement receipt of reply on a socket.
+ * We must search through the list of received datagrams matching them
+ * with outstanding requests using the xid, until ours is found.
+ */
+/* ARGSUSED */
+nfs_reply(myrep)
+	struct nfsreq *myrep;
+{
+	register struct nfsreq *rep;
+	register struct nfsmount *nmp = myrep->r_nmp;
+	register long t1;
+	struct mbuf *mrep, *nam, *md;
+	u_long rxid, *tl;
+	caddr_t dpos, cp2;
+	int error;
+
+	/*
+	 * Loop around until we get our own reply
+	 */
+	for (;;) {
+		/*
+		 * Lock against other receivers so that I don't get stuck in
+		 * sbwait() after someone else has received my reply for me.
+		 * Also necessary for connection based protocols to avoid
+		 * race conditions during a reconnect.
+		 */
+		if (error = nfs_rcvlock(myrep))
+			return (error);
+		/* Already received, bye bye */
+		if (myrep->r_mrep != NULL) {
+			nfs_rcvunlock(&nmp->nm_flag);
+			return (0);
+		}
+		/*
+		 * Get the next Rpc reply off the socket
+		 */
+		error = nfs_receive(myrep, &nam, &mrep);
+		nfs_rcvunlock(&nmp->nm_flag);
+		if (error) {
+
+			/*
+			 * Ignore routing errors on connectionless protocols??
+			 */
+			if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) {
+				nmp->nm_so->so_error = 0;
+				if (myrep->r_flags & R_GETONEREP)
+					return (0);
+				continue;
+			}
+			return (error);
+		}
+		if (nam)
+			m_freem(nam);
+	
+		/*
+		 * Get the xid and check that it is an rpc reply
+		 */
+		md = mrep;
+		dpos = mtod(md, caddr_t);
+		nfsm_dissect(tl, u_long *, 2*NFSX_UNSIGNED);
+		rxid = *tl++;
+		if (*tl != rpc_reply) {
+			if (nmp->nm_flag & NFSMNT_NQNFS) {
+				if (nqnfs_callback(nmp, mrep, md, dpos))
+					nfsstats.rpcinvalid++;
+			} else {
+				nfsstats.rpcinvalid++;
+				m_freem(mrep);
+			}
+nfsmout:
+			if (myrep->r_flags & R_GETONEREP)
+				return (0);
+			continue;
+		}
+
+		/*
+		 * Loop through the request list to match up the reply
+		 * Iff no match, just drop the datagram
+		 */
+		rep = nfsreqh.r_next;
+		while (rep != &nfsreqh) {
+			if (rep->r_mrep == NULL && rxid == rep->r_xid) {
+				/* Found it.. */
+				rep->r_mrep = mrep;
+				rep->r_md = md;
+				rep->r_dpos = dpos;
+				if (nfsrtton) {
+					struct rttl *rt;
+
+					rt = &nfsrtt.rttl[nfsrtt.pos];
+					rt->proc = rep->r_procnum;
+					rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]);
+					rt->sent = nmp->nm_sent;
+					rt->cwnd = nmp->nm_cwnd;
+					rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1];
+					rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1];
+					rt->fsid = nmp->nm_mountp->mnt_stat.f_fsid;
+					rt->tstamp = time;
+					if (rep->r_flags & R_TIMING)
+						rt->rtt = rep->r_rtt;
+					else
+						rt->rtt = 1000000;
+					nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ;
+				}
+				/*
+				 * Update congestion window.
+				 * Do the additive increase of
+				 * one rpc/rtt.
+				 */
+				if (nmp->nm_cwnd <= nmp->nm_sent) {
+					nmp->nm_cwnd +=
+					   (NFS_CWNDSCALE * NFS_CWNDSCALE +
+					   (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd;
+					if (nmp->nm_cwnd > NFS_MAXCWND)
+						nmp->nm_cwnd = NFS_MAXCWND;
+				}
+				rep->r_flags &= ~R_SENT;
+				nmp->nm_sent -= NFS_CWNDSCALE;
+				/*
+				 * Update rtt using a gain of 0.125 on the mean
+				 * and a gain of 0.25 on the deviation.
+				 */
+				if (rep->r_flags & R_TIMING) {
+					/*
+					 * Since the timer resolution of
+					 * NFS_HZ is so course, it can often
+					 * result in r_rtt == 0. Since
+					 * r_rtt == N means that the actual
+					 * rtt is between N+dt and N+2-dt ticks,
+					 * add 1.
+					 */
+					t1 = rep->r_rtt + 1;
+					t1 -= (NFS_SRTT(rep) >> 3);
+					NFS_SRTT(rep) += t1;
+					if (t1 < 0)
+						t1 = -t1;
+					t1 -= (NFS_SDRTT(rep) >> 2);
+					NFS_SDRTT(rep) += t1;
+				}
+				nmp->nm_timeouts = 0;
+				break;
+			}
+			rep = rep->r_next;
+		}
+		/*
+		 * If not matched to a request, drop it.
+		 * If it's mine, get out.
+		 */
+		if (rep == &nfsreqh) {
+			nfsstats.rpcunexpected++;
+			m_freem(mrep);
+		} else if (rep == myrep) {
+			if (rep->r_mrep == NULL)
+				panic("nfsreply nil");
+			return (0);
+		}
+		if (myrep->r_flags & R_GETONEREP)
+			return (0);
+	}
+}
+
+/*
+ * nfs_request - goes something like this
+ *	- fill in request struct
+ *	- links it into list
+ *	- calls nfs_send() for first transmit
+ *	- calls nfs_receive() to get reply
+ *	- break down rpc header and return with nfs reply pointed to
+ *	  by mrep or error
+ * nb: always frees up mreq mbuf list
+ */
+nfs_request(vp, mrest, procnum, procp, cred, mrp, mdp, dposp)
+	struct vnode *vp;
+	struct mbuf *mrest;
+	int procnum;
+	struct proc *procp;
+	struct ucred *cred;
+	struct mbuf **mrp;
+	struct mbuf **mdp;
+	caddr_t *dposp;
+{
+	register struct mbuf *m, *mrep;
+	register struct nfsreq *rep;
+	register u_long *tl;
+	register int i;
+	struct nfsmount *nmp;
+	struct mbuf *md, *mheadend;
+	struct nfsreq *reph;
+	struct nfsnode *np;
+	time_t reqtime, waituntil;
+	caddr_t dpos, cp2;
+	int t1, nqlflag, cachable, s, error = 0, mrest_len, auth_len, auth_type;
+	int trylater_delay = NQ_TRYLATERDEL, trylater_cnt = 0, failed_auth = 0;
+	u_long xid;
+	u_quad_t frev;
+	char *auth_str;
+
+	nmp = VFSTONFS(vp->v_mount);
+	MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq), M_NFSREQ, M_WAITOK);
+	rep->r_nmp = nmp;
+	rep->r_vp = vp;
+	rep->r_procp = procp;
+	rep->r_procnum = procnum;
+	i = 0;
+	m = mrest;
+	while (m) {
+		i += m->m_len;
+		m = m->m_next;
+	}
+	mrest_len = i;
+
+	/*
+	 * Get the RPC header with authorization.
+	 */
+kerbauth:
+	auth_str = (char *)0;
+	if (nmp->nm_flag & NFSMNT_KERB) {
+		if (failed_auth) {
+			error = nfs_getauth(nmp, rep, cred, &auth_type,
+				&auth_str, &auth_len);
+			if (error) {
+				free((caddr_t)rep, M_NFSREQ);
+				m_freem(mrest);
+				return (error);
+			}
+		} else {
+			auth_type = RPCAUTH_UNIX;
+			auth_len = 5 * NFSX_UNSIGNED;
+		}
+	} else {
+		auth_type = RPCAUTH_UNIX;
+		if (cred->cr_ngroups < 1)
+			panic("nfsreq nogrps");
+		auth_len = ((((cred->cr_ngroups - 1) > nmp->nm_numgrps) ?
+			nmp->nm_numgrps : (cred->cr_ngroups - 1)) << 2) +
+			5 * NFSX_UNSIGNED;
+	}
+	m = nfsm_rpchead(cred, (nmp->nm_flag & NFSMNT_NQNFS), procnum,
+	     auth_type, auth_len, auth_str, mrest, mrest_len, &mheadend, &xid);
+	if (auth_str)
+		free(auth_str, M_TEMP);
+
+	/*
+	 * For stream protocols, insert a Sun RPC Record Mark.
+	 */
+	if (nmp->nm_sotype == SOCK_STREAM) {
+		M_PREPEND(m, NFSX_UNSIGNED, M_WAIT);
+		*mtod(m, u_long *) = htonl(0x80000000 |
+			 (m->m_pkthdr.len - NFSX_UNSIGNED));
+	}
+	rep->r_mreq = m;
+	rep->r_xid = xid;
+tryagain:
+	if (nmp->nm_flag & NFSMNT_SOFT)
+		rep->r_retry = nmp->nm_retry;
+	else
+		rep->r_retry = NFS_MAXREXMIT + 1;	/* past clip limit */
+	rep->r_rtt = rep->r_rexmit = 0;
+	if (proct[procnum] > 0)
+		rep->r_flags = R_TIMING;
+	else
+		rep->r_flags = 0;
+	rep->r_mrep = NULL;
+
+	/*
+	 * Do the client side RPC.
+	 */
+	nfsstats.rpcrequests++;
+	/*
+	 * Chain request into list of outstanding requests. Be sure
+	 * to put it LAST so timer finds oldest requests first.
+	 */
+	s = splsoftclock();
+	reph = &nfsreqh;
+	reph->r_prev->r_next = rep;
+	rep->r_prev = reph->r_prev;
+	reph->r_prev = rep;
+	rep->r_next = reph;
+
+	/* Get send time for nqnfs */
+	reqtime = time.tv_sec;
+
+	/*
+	 * If backing off another request or avoiding congestion, don't
+	 * send this one now but let timer do it. If not timing a request,
+	 * do it now.
+	 */
+	if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM ||
+		(nmp->nm_flag & NFSMNT_DUMBTIMR) ||
+		nmp->nm_sent < nmp->nm_cwnd)) {
+		splx(s);
+		if (nmp->nm_soflags & PR_CONNREQUIRED)
+			error = nfs_sndlock(&nmp->nm_flag, rep);
+		if (!error) {
+			m = m_copym(m, 0, M_COPYALL, M_WAIT);
+			error = nfs_send(nmp->nm_so, nmp->nm_nam, m, rep);
+			if (nmp->nm_soflags & PR_CONNREQUIRED)
+				nfs_sndunlock(&nmp->nm_flag);
+		}
+		if (!error && (rep->r_flags & R_MUSTRESEND) == 0) {
+			nmp->nm_sent += NFS_CWNDSCALE;
+			rep->r_flags |= R_SENT;
+		}
+	} else {
+		splx(s);
+		rep->r_rtt = -1;
+	}
+
+	/*
+	 * Wait for the reply from our send or the timer's.
+	 */
+	if (!error || error == EPIPE)
+		error = nfs_reply(rep);
+
+	/*
+	 * RPC done, unlink the request.
+	 */
+	s = splsoftclock();
+	rep->r_prev->r_next = rep->r_next;
+	rep->r_next->r_prev = rep->r_prev;
+	splx(s);
+
+	/*
+	 * Decrement the outstanding request count.
+	 */
+	if (rep->r_flags & R_SENT) {
+		rep->r_flags &= ~R_SENT;	/* paranoia */
+		nmp->nm_sent -= NFS_CWNDSCALE;
+	}
+
+	/*
+	 * If there was a successful reply and a tprintf msg.
+	 * tprintf a response.
+	 */
+	if (!error && (rep->r_flags & R_TPRINTFMSG))
+		nfs_msg(rep->r_procp, nmp->nm_mountp->mnt_stat.f_mntfromname,
+		    "is alive again");
+	mrep = rep->r_mrep;
+	md = rep->r_md;
+	dpos = rep->r_dpos;
+	if (error) {
+		m_freem(rep->r_mreq);
+		free((caddr_t)rep, M_NFSREQ);
+		return (error);
+	}
+
+	/*
+	 * break down the rpc header and check if ok
+	 */
+	nfsm_dissect(tl, u_long *, 3*NFSX_UNSIGNED);
+	if (*tl++ == rpc_msgdenied) {
+		if (*tl == rpc_mismatch)
+			error = EOPNOTSUPP;
+		else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) {
+			if (*tl == rpc_rejectedcred && failed_auth == 0) {
+				failed_auth++;
+				mheadend->m_next = (struct mbuf *)0;
+				m_freem(mrep);
+				m_freem(rep->r_mreq);
+				goto kerbauth;
+			} else
+				error = EAUTH;
+		} else
+			error = EACCES;
+		m_freem(mrep);
+		m_freem(rep->r_mreq);
+		free((caddr_t)rep, M_NFSREQ);
+		return (error);
+	}
+
+	/*
+	 * skip over the auth_verf, someday we may want to cache auth_short's
+	 * for nfs_reqhead(), but for now just dump it
+	 */
+	if (*++tl != 0) {
+		i = nfsm_rndup(fxdr_unsigned(long, *tl));
+		nfsm_adv(i);
+	}
+	nfsm_dissect(tl, u_long *, NFSX_UNSIGNED);
+	/* 0 == ok */
+	if (*tl == 0) {
+		nfsm_dissect(tl, u_long *, NFSX_UNSIGNED);
+		if (*tl != 0) {
+			error = fxdr_unsigned(int, *tl);
+			m_freem(mrep);
+			if ((nmp->nm_flag & NFSMNT_NQNFS) &&
+			    error == NQNFS_TRYLATER) {
+				error = 0;
+				waituntil = time.tv_sec + trylater_delay;
+				while (time.tv_sec < waituntil)
+					(void) tsleep((caddr_t)&lbolt,
+						PSOCK, "nqnfstry", 0);
+				trylater_delay *= nfs_backoff[trylater_cnt];
+				if (trylater_cnt < 7)
+					trylater_cnt++;
+				goto tryagain;
+			}
+
+			/*
+			 * If the File Handle was stale, invalidate the
+			 * lookup cache, just in case.
+			 */
+			if (error == ESTALE)
+				cache_purge(vp);
+			m_freem(rep->r_mreq);
+			free((caddr_t)rep, M_NFSREQ);
+			return (error);
+		}
+
+		/*
+		 * For nqnfs, get any lease in reply
+		 */
+		if (nmp->nm_flag & NFSMNT_NQNFS) {
+			nfsm_dissect(tl, u_long *, NFSX_UNSIGNED);
+			if (*tl) {
+				np = VTONFS(vp);
+				nqlflag = fxdr_unsigned(int, *tl);
+				nfsm_dissect(tl, u_long *, 4*NFSX_UNSIGNED);
+				cachable = fxdr_unsigned(int, *tl++);
+				reqtime += fxdr_unsigned(int, *tl++);
+				if (reqtime > time.tv_sec) {
+				    fxdr_hyper(tl, &frev);
+				    nqnfs_clientlease(nmp, np, nqlflag,
+					cachable, reqtime, frev);
+				}
+			}
+		}
+		*mrp = mrep;
+		*mdp = md;
+		*dposp = dpos;
+		m_freem(rep->r_mreq);
+		FREE((caddr_t)rep, M_NFSREQ);
+		return (0);
+	}
+	m_freem(mrep);
+	m_freem(rep->r_mreq);
+	free((caddr_t)rep, M_NFSREQ);
+	error = EPROTONOSUPPORT;
+nfsmout:
+	return (error);
+}
+
+/*
+ * Generate the rpc reply header
+ * siz arg. is used to decide if adding a cluster is worthwhile
+ */
+nfs_rephead(siz, nd, err, cache, frev, mrq, mbp, bposp)
+	int siz;
+	struct nfsd *nd;
+	int err;
+	int cache;
+	u_quad_t *frev;
+	struct mbuf **mrq;
+	struct mbuf **mbp;
+	caddr_t *bposp;
+{
+	register u_long *tl;
+	register struct mbuf *mreq;
+	caddr_t bpos;
+	struct mbuf *mb, *mb2;
+
+	MGETHDR(mreq, M_WAIT, MT_DATA);
+	mb = mreq;
+	/*
+	 * If this is a big reply, use a cluster else
+	 * try and leave leading space for the lower level headers.
+	 */
+	siz += RPC_REPLYSIZ;
+	if (siz >= MINCLSIZE) {
+		MCLGET(mreq, M_WAIT);
+	} else
+		mreq->m_data += max_hdr;
+	tl = mtod(mreq, u_long *);
+	mreq->m_len = 6*NFSX_UNSIGNED;
+	bpos = ((caddr_t)tl)+mreq->m_len;
+	*tl++ = nd->nd_retxid;
+	*tl++ = rpc_reply;
+	if (err == ERPCMISMATCH || err == NQNFS_AUTHERR) {
+		*tl++ = rpc_msgdenied;
+		if (err == NQNFS_AUTHERR) {
+			*tl++ = rpc_autherr;
+			*tl = rpc_rejectedcred;
+			mreq->m_len -= NFSX_UNSIGNED;
+			bpos -= NFSX_UNSIGNED;
+		} else {
+			*tl++ = rpc_mismatch;
+			*tl++ = txdr_unsigned(2);
+			*tl = txdr_unsigned(2);
+		}
+	} else {
+		*tl++ = rpc_msgaccepted;
+		*tl++ = 0;
+		*tl++ = 0;
+		switch (err) {
+		case EPROGUNAVAIL:
+			*tl = txdr_unsigned(RPC_PROGUNAVAIL);
+			break;
+		case EPROGMISMATCH:
+			*tl = txdr_unsigned(RPC_PROGMISMATCH);
+			nfsm_build(tl, u_long *, 2*NFSX_UNSIGNED);
+			*tl++ = txdr_unsigned(2);
+			*tl = txdr_unsigned(2);	/* someday 3 */
+			break;
+		case EPROCUNAVAIL:
+			*tl = txdr_unsigned(RPC_PROCUNAVAIL);
+			break;
+		default:
+			*tl = 0;
+			if (err != VNOVAL) {
+				nfsm_build(tl, u_long *, NFSX_UNSIGNED);
+				if (err)
+					*tl = txdr_unsigned(nfsrv_errmap[err - 1]);
+				else
+					*tl = 0;
+			}
+			break;
+		};
+	}
+
+	/*
+	 * For nqnfs, piggyback lease as requested.
+	 */
+	if (nd->nd_nqlflag != NQL_NOVAL && err == 0) {
+		if (nd->nd_nqlflag) {
+			nfsm_build(tl, u_long *, 5*NFSX_UNSIGNED);
+			*tl++ = txdr_unsigned(nd->nd_nqlflag);
+			*tl++ = txdr_unsigned(cache);
+			*tl++ = txdr_unsigned(nd->nd_duration);
+			txdr_hyper(frev, tl);
+		} else {
+			if (nd->nd_nqlflag != 0)
+				panic("nqreph");
+			nfsm_build(tl, u_long *, NFSX_UNSIGNED);
+			*tl = 0;
+		}
+	}
+	*mrq = mreq;
+	*mbp = mb;
+	*bposp = bpos;
+	if (err != 0 && err != VNOVAL)
+		nfsstats.srvrpc_errs++;
+	return (0);
+}
+
+/*
+ * Nfs timer routine
+ * Scan the nfsreq list and retranmit any requests that have timed out
+ * To avoid retransmission attempts on STREAM sockets (in the future) make
+ * sure to set the r_retry field to 0 (implies nm_retry == 0).
+ */
+void
+nfs_timer(arg)
+	void *arg;
+{
+	register struct nfsreq *rep;
+	register struct mbuf *m;
+	register struct socket *so;
+	register struct nfsmount *nmp;
+	register int timeo;
+	static long lasttime = 0;
+	int s, error;
+
+	s = splnet();
+	for (rep = nfsreqh.r_next; rep != &nfsreqh; rep = rep->r_next) {
+		nmp = rep->r_nmp;
+		if (rep->r_mrep || (rep->r_flags & R_SOFTTERM))
+			continue;
+		if (nfs_sigintr(nmp, rep, rep->r_procp)) {
+			rep->r_flags |= R_SOFTTERM;
+			continue;
+		}
+		if (rep->r_rtt >= 0) {
+			rep->r_rtt++;
+			if (nmp->nm_flag & NFSMNT_DUMBTIMR)
+				timeo = nmp->nm_timeo;
+			else
+				timeo = NFS_RTO(nmp, proct[rep->r_procnum]);
+			if (nmp->nm_timeouts > 0)
+				timeo *= nfs_backoff[nmp->nm_timeouts - 1];
+			if (rep->r_rtt <= timeo)
+				continue;
+			if (nmp->nm_timeouts < 8)
+				nmp->nm_timeouts++;
+		}
+		/*
+		 * Check for server not responding
+		 */
+		if ((rep->r_flags & R_TPRINTFMSG) == 0 &&
+		     rep->r_rexmit > nmp->nm_deadthresh) {
+			nfs_msg(rep->r_procp,
+			    nmp->nm_mountp->mnt_stat.f_mntfromname,
+			    "not responding");
+			rep->r_flags |= R_TPRINTFMSG;
+		}
+		if (rep->r_rexmit >= rep->r_retry) {	/* too many */
+			nfsstats.rpctimeouts++;
+			rep->r_flags |= R_SOFTTERM;
+			continue;
+		}
+		if (nmp->nm_sotype != SOCK_DGRAM) {
+			if (++rep->r_rexmit > NFS_MAXREXMIT)
+				rep->r_rexmit = NFS_MAXREXMIT;
+			continue;
+		}
+		if ((so = nmp->nm_so) == NULL)
+			continue;
+
+		/*
+		 * If there is enough space and the window allows..
+		 *	Resend it
+		 * Set r_rtt to -1 in case we fail to send it now.
+		 */
+		rep->r_rtt = -1;
+		if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len &&
+		   ((nmp->nm_flag & NFSMNT_DUMBTIMR) ||
+		    (rep->r_flags & R_SENT) ||
+		    nmp->nm_sent < nmp->nm_cwnd) &&
+		   (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){
+			if ((nmp->nm_flag & NFSMNT_NOCONN) == 0)
+			    error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m,
+			    (struct mbuf *)0, (struct mbuf *)0);
+			else
+			    error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m,
+			    nmp->nm_nam, (struct mbuf *)0);
+			if (error) {
+				if (NFSIGNORE_SOERROR(nmp->nm_soflags, error))
+					so->so_error = 0;
+			} else {
+				/*
+				 * Iff first send, start timing
+				 * else turn timing off, backoff timer
+				 * and divide congestion window by 2.
+				 */
+				if (rep->r_flags & R_SENT) {
+					rep->r_flags &= ~R_TIMING;
+					if (++rep->r_rexmit > NFS_MAXREXMIT)
+						rep->r_rexmit = NFS_MAXREXMIT;
+					nmp->nm_cwnd >>= 1;
+					if (nmp->nm_cwnd < NFS_CWNDSCALE)
+						nmp->nm_cwnd = NFS_CWNDSCALE;
+					nfsstats.rpcretries++;
+				} else {
+					rep->r_flags |= R_SENT;
+					nmp->nm_sent += NFS_CWNDSCALE;
+				}
+				rep->r_rtt = 0;
+			}
+		}
+	}
+
+	/*
+	 * Call the nqnfs server timer once a second to handle leases.
+	 */
+	if (lasttime != time.tv_sec) {
+		lasttime = time.tv_sec;
+		nqnfs_serverd();
+	}
+	splx(s);
+	timeout(nfs_timer, (void *)0, hz / NFS_HZ);
+}
+
+/*
+ * Test for a termination condition pending on the process.
+ * This is used for NFSMNT_INT mounts.
+ */
+nfs_sigintr(nmp, rep, p)
+	struct nfsmount *nmp;
+	struct nfsreq *rep;
+	register struct proc *p;
+{
+
+	if (rep && (rep->r_flags & R_SOFTTERM))
+		return (EINTR);
+	if (!(nmp->nm_flag & NFSMNT_INT))
+		return (0);
+	if (p && p->p_siglist &&
+	    (((p->p_siglist & ~p->p_sigmask) & ~p->p_sigignore) &
+	    NFSINT_SIGMASK))
+		return (EINTR);
+	return (0);
+}
+
+/*
+ * Lock a socket against others.
+ * Necessary for STREAM sockets to ensure you get an entire rpc request/reply
+ * and also to avoid race conditions between the processes with nfs requests
+ * in progress when a reconnect is necessary.
+ */
+nfs_sndlock(flagp, rep)
+	register int *flagp;
+	struct nfsreq *rep;
+{
+	struct proc *p;
+	int slpflag = 0, slptimeo = 0;
+
+	if (rep) {
+		p = rep->r_procp;
+		if (rep->r_nmp->nm_flag & NFSMNT_INT)
+			slpflag = PCATCH;
+	} else
+		p = (struct proc *)0;
+	while (*flagp & NFSMNT_SNDLOCK) {
+		if (nfs_sigintr(rep->r_nmp, rep, p))
+			return (EINTR);
+		*flagp |= NFSMNT_WANTSND;
+		(void) tsleep((caddr_t)flagp, slpflag | (PZERO - 1), "nfsndlck",
+			slptimeo);
+		if (slpflag == PCATCH) {
+			slpflag = 0;
+			slptimeo = 2 * hz;
+		}
+	}
+	*flagp |= NFSMNT_SNDLOCK;
+	return (0);
+}
+
+/*
+ * Unlock the stream socket for others.
+ */
+void
+nfs_sndunlock(flagp)
+	register int *flagp;
+{
+
+	if ((*flagp & NFSMNT_SNDLOCK) == 0)
+		panic("nfs sndunlock");
+	*flagp &= ~NFSMNT_SNDLOCK;
+	if (*flagp & NFSMNT_WANTSND) {
+		*flagp &= ~NFSMNT_WANTSND;
+		wakeup((caddr_t)flagp);
+	}
+}
+
+nfs_rcvlock(rep)
+	register struct nfsreq *rep;
+{
+	register int *flagp = &rep->r_nmp->nm_flag;
+	int slpflag, slptimeo = 0;
+
+	if (*flagp & NFSMNT_INT)
+		slpflag = PCATCH;
+	else
+		slpflag = 0;
+	while (*flagp & NFSMNT_RCVLOCK) {
+		if (nfs_sigintr(rep->r_nmp, rep, rep->r_procp))
+			return (EINTR);
+		*flagp |= NFSMNT_WANTRCV;
+		(void) tsleep((caddr_t)flagp, slpflag | (PZERO - 1), "nfsrcvlk",
+			slptimeo);
+		if (slpflag == PCATCH) {
+			slpflag = 0;
+			slptimeo = 2 * hz;
+		}
+	}
+	*flagp |= NFSMNT_RCVLOCK;
+	return (0);
+}
+
+/*
+ * Unlock the stream socket for others.
+ */
+void
+nfs_rcvunlock(flagp)
+	register int *flagp;
+{
+
+	if ((*flagp & NFSMNT_RCVLOCK) == 0)
+		panic("nfs rcvunlock");
+	*flagp &= ~NFSMNT_RCVLOCK;
+	if (*flagp & NFSMNT_WANTRCV) {
+		*flagp &= ~NFSMNT_WANTRCV;
+		wakeup((caddr_t)flagp);
+	}
+}
+
+/*
+ * Check for badly aligned mbuf data areas and
+ * realign data in an mbuf list by copying the data areas up, as required.
+ */
+void
+nfs_realign(m, hsiz)
+	register struct mbuf *m;
+	int hsiz;
+{
+	register struct mbuf *m2;
+	register int siz, mlen, olen;
+	register caddr_t tcp, fcp;
+	struct mbuf *mnew;
+
+	while (m) {
+	    /*
+	     * This never happens for UDP, rarely happens for TCP
+	     * but frequently happens for iso transport.
+	     */
+	    if ((m->m_len & 0x3) || (mtod(m, int) & 0x3)) {
+		olen = m->m_len;
+		fcp = mtod(m, caddr_t);
+		if ((int)fcp & 0x3) {
+			m->m_flags &= ~M_PKTHDR;
+			if (m->m_flags & M_EXT)
+				m->m_data = m->m_ext.ext_buf +
+					((m->m_ext.ext_size - olen) & ~0x3);
+			else
+				m->m_data = m->m_dat;
+		}
+		m->m_len = 0;
+		tcp = mtod(m, caddr_t);
+		mnew = m;
+		m2 = m->m_next;
+	
+		/*
+		 * If possible, only put the first invariant part
+		 * of the RPC header in the first mbuf.
+		 */
+		mlen = M_TRAILINGSPACE(m);
+		if (olen <= hsiz && mlen > hsiz)
+			mlen = hsiz;
+	
+		/*
+		 * Loop through the mbuf list consolidating data.
+		 */
+		while (m) {
+			while (olen > 0) {
+				if (mlen == 0) {
+					m2->m_flags &= ~M_PKTHDR;
+					if (m2->m_flags & M_EXT)
+						m2->m_data = m2->m_ext.ext_buf;
+					else
+						m2->m_data = m2->m_dat;
+					m2->m_len = 0;
+					mlen = M_TRAILINGSPACE(m2);
+					tcp = mtod(m2, caddr_t);
+					mnew = m2;
+					m2 = m2->m_next;
+				}
+				siz = min(mlen, olen);
+				if (tcp != fcp)
+					bcopy(fcp, tcp, siz);
+				mnew->m_len += siz;
+				mlen -= siz;
+				olen -= siz;
+				tcp += siz;
+				fcp += siz;
+			}
+			m = m->m_next;
+			if (m) {
+				olen = m->m_len;
+				fcp = mtod(m, caddr_t);
+			}
+		}
+	
+		/*
+		 * Finally, set m_len == 0 for any trailing mbufs that have
+		 * been copied out of.
+		 */
+		while (m2) {
+			m2->m_len = 0;
+			m2 = m2->m_next;
+		}
+		return;
+	    }
+	    m = m->m_next;
+	}
+}
+
+/*
+ * Socket upcall routine for the nfsd sockets.
+ * The caddr_t arg is a pointer to the "struct nfssvc_sock".
+ * Essentially do as much as possible non-blocking, else punt and it will
+ * be called with M_WAIT from an nfsd.
+ */
+void
+nfsrv_rcv(so, arg, waitflag)
+	struct socket *so;
+	caddr_t arg;
+	int waitflag;
+{
+	register struct nfssvc_sock *slp = (struct nfssvc_sock *)arg;
+	register struct mbuf *m;
+	struct mbuf *mp, *nam;
+	struct uio auio;
+	int flags, error;
+
+	if ((slp->ns_flag & SLP_VALID) == 0)
+		return;
+#ifdef notdef
+	/*
+	 * Define this to test for nfsds handling this under heavy load.
+	 */
+	if (waitflag == M_DONTWAIT) {
+		slp->ns_flag |= SLP_NEEDQ; goto dorecs;
+	}
+#endif
+	auio.uio_procp = NULL;
+	if (so->so_type == SOCK_STREAM) {
+		/*
+		 * If there are already records on the queue, defer soreceive()
+		 * to an nfsd so that there is feedback to the TCP layer that
+		 * the nfs servers are heavily loaded.
+		 */
+		if (slp->ns_rec && waitflag == M_DONTWAIT) {
+			slp->ns_flag |= SLP_NEEDQ;
+			goto dorecs;
+		}
+
+		/*
+		 * Do soreceive().
+		 */
+		auio.uio_resid = 1000000000;
+		flags = MSG_DONTWAIT;
+		error = soreceive(so, &nam, &auio, &mp, (struct mbuf **)0, &flags);
+		if (error || mp == (struct mbuf *)0) {
+			if (error == EWOULDBLOCK)
+				slp->ns_flag |= SLP_NEEDQ;
+			else
+				slp->ns_flag |= SLP_DISCONN;
+			goto dorecs;
+		}
+		m = mp;
+		if (slp->ns_rawend) {
+			slp->ns_rawend->m_next = m;
+			slp->ns_cc += 1000000000 - auio.uio_resid;
+		} else {
+			slp->ns_raw = m;
+			slp->ns_cc = 1000000000 - auio.uio_resid;
+		}
+		while (m->m_next)
+			m = m->m_next;
+		slp->ns_rawend = m;
+
+		/*
+		 * Now try and parse record(s) out of the raw stream data.
+		 */
+		if (error = nfsrv_getstream(slp, waitflag)) {
+			if (error == EPERM)
+				slp->ns_flag |= SLP_DISCONN;
+			else
+				slp->ns_flag |= SLP_NEEDQ;
+		}
+	} else {
+		do {
+			auio.uio_resid = 1000000000;
+			flags = MSG_DONTWAIT;
+			error = soreceive(so, &nam, &auio, &mp,
+						(struct mbuf **)0, &flags);
+			if (mp) {
+				nfs_realign(mp, 10 * NFSX_UNSIGNED);
+				if (nam) {
+					m = nam;
+					m->m_next = mp;
+				} else
+					m = mp;
+				if (slp->ns_recend)
+					slp->ns_recend->m_nextpkt = m;
+				else
+					slp->ns_rec = m;
+				slp->ns_recend = m;
+				m->m_nextpkt = (struct mbuf *)0;
+			}
+			if (error) {
+				if ((so->so_proto->pr_flags & PR_CONNREQUIRED)
+					&& error != EWOULDBLOCK) {
+					slp->ns_flag |= SLP_DISCONN;
+					goto dorecs;
+				}
+			}
+		} while (mp);
+	}
+
+	/*
+	 * Now try and process the request records, non-blocking.
+	 */
+dorecs:
+	if (waitflag == M_DONTWAIT &&
+		(slp->ns_rec || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN))))
+		nfsrv_wakenfsd(slp);
+}
+
+/*
+ * Try and extract an RPC request from the mbuf data list received on a
+ * stream socket. The "waitflag" argument indicates whether or not it
+ * can sleep.
+ */
+nfsrv_getstream(slp, waitflag)
+	register struct nfssvc_sock *slp;
+	int waitflag;
+{
+	register struct mbuf *m;
+	register char *cp1, *cp2;
+	register int len;
+	struct mbuf *om, *m2, *recm;
+	u_long recmark;
+
+	if (slp->ns_flag & SLP_GETSTREAM)
+		panic("nfs getstream");
+	slp->ns_flag |= SLP_GETSTREAM;
+	for (;;) {
+	    if (slp->ns_reclen == 0) {
+		if (slp->ns_cc < NFSX_UNSIGNED) {
+			slp->ns_flag &= ~SLP_GETSTREAM;
+			return (0);
+		}
+		m = slp->ns_raw;
+		if (m->m_len >= NFSX_UNSIGNED) {
+			bcopy(mtod(m, caddr_t), (caddr_t)&recmark, NFSX_UNSIGNED);
+			m->m_data += NFSX_UNSIGNED;
+			m->m_len -= NFSX_UNSIGNED;
+		} else {
+			cp1 = (caddr_t)&recmark;
+			cp2 = mtod(m, caddr_t);
+			while (cp1 < ((caddr_t)&recmark) + NFSX_UNSIGNED) {
+				while (m->m_len == 0) {
+					m = m->m_next;
+					cp2 = mtod(m, caddr_t);
+				}
+				*cp1++ = *cp2++;
+				m->m_data++;
+				m->m_len--;
+			}
+		}
+		slp->ns_cc -= NFSX_UNSIGNED;
+		slp->ns_reclen = ntohl(recmark) & ~0x80000000;
+		if (slp->ns_reclen < NFS_MINPACKET || slp->ns_reclen > NFS_MAXPACKET) {
+			slp->ns_flag &= ~SLP_GETSTREAM;
+			return (EPERM);
+		}
+	    }
+
+	    /*
+	     * Now get the record part.
+	     */
+	    if (slp->ns_cc == slp->ns_reclen) {
+		recm = slp->ns_raw;
+		slp->ns_raw = slp->ns_rawend = (struct mbuf *)0;
+		slp->ns_cc = slp->ns_reclen = 0;
+	    } else if (slp->ns_cc > slp->ns_reclen) {
+		len = 0;
+		m = slp->ns_raw;
+		om = (struct mbuf *)0;
+		while (len < slp->ns_reclen) {
+			if ((len + m->m_len) > slp->ns_reclen) {
+				m2 = m_copym(m, 0, slp->ns_reclen - len,
+					waitflag);
+				if (m2) {
+					if (om) {
+						om->m_next = m2;
+						recm = slp->ns_raw;
+					} else
+						recm = m2;
+					m->m_data += slp->ns_reclen - len;
+					m->m_len -= slp->ns_reclen - len;
+					len = slp->ns_reclen;
+				} else {
+					slp->ns_flag &= ~SLP_GETSTREAM;
+					return (EWOULDBLOCK);
+				}
+			} else if ((len + m->m_len) == slp->ns_reclen) {
+				om = m;
+				len += m->m_len;
+				m = m->m_next;
+				recm = slp->ns_raw;
+				om->m_next = (struct mbuf *)0;
+			} else {
+				om = m;
+				len += m->m_len;
+				m = m->m_next;
+			}
+		}
+		slp->ns_raw = m;
+		slp->ns_cc -= len;
+		slp->ns_reclen = 0;
+	    } else {
+		slp->ns_flag &= ~SLP_GETSTREAM;
+		return (0);
+	    }
+	    nfs_realign(recm, 10 * NFSX_UNSIGNED);
+	    if (slp->ns_recend)
+		slp->ns_recend->m_nextpkt = recm;
+	    else
+		slp->ns_rec = recm;
+	    slp->ns_recend = recm;
+	}
+}
+
+/*
+ * Parse an RPC header.
+ */
+nfsrv_dorec(slp, nd)
+	register struct nfssvc_sock *slp;
+	register struct nfsd *nd;
+{
+	register struct mbuf *m;
+	int error;
+
+	if ((slp->ns_flag & SLP_VALID) == 0 ||
+	    (m = slp->ns_rec) == (struct mbuf *)0)
+		return (ENOBUFS);
+	if (slp->ns_rec = m->m_nextpkt)
+		m->m_nextpkt = (struct mbuf *)0;
+	else
+		slp->ns_recend = (struct mbuf *)0;
+	if (m->m_type == MT_SONAME) {
+		nd->nd_nam = m;
+		nd->nd_md = nd->nd_mrep = m->m_next;
+		m->m_next = (struct mbuf *)0;
+	} else {
+		nd->nd_nam = (struct mbuf *)0;
+		nd->nd_md = nd->nd_mrep = m;
+	}
+	nd->nd_dpos = mtod(nd->nd_md, caddr_t);
+	if (error = nfs_getreq(nd, TRUE)) {
+		m_freem(nd->nd_nam);
+		return (error);
+	}
+	return (0);
+}
+
+/*
+ * Parse an RPC request
+ * - verify it
+ * - fill in the cred struct.
+ */
+nfs_getreq(nd, has_header)
+	register struct nfsd *nd;
+	int has_header;
+{
+	register int len, i;
+	register u_long *tl;
+	register long t1;
+	struct uio uio;
+	struct iovec iov;
+	caddr_t dpos, cp2;
+	u_long nfsvers, auth_type;
+	int error = 0, nqnfs = 0;
+	struct mbuf *mrep, *md;
+
+	mrep = nd->nd_mrep;
+	md = nd->nd_md;
+	dpos = nd->nd_dpos;
+	if (has_header) {
+		nfsm_dissect(tl, u_long *, 10*NFSX_UNSIGNED);
+		nd->nd_retxid = *tl++;
+		if (*tl++ != rpc_call) {
+			m_freem(mrep);
+			return (EBADRPC);
+		}
+	} else {
+		nfsm_dissect(tl, u_long *, 8*NFSX_UNSIGNED);
+	}
+	nd->nd_repstat = 0;
+	if (*tl++ != rpc_vers) {
+		nd->nd_repstat = ERPCMISMATCH;
+		nd->nd_procnum = NFSPROC_NOOP;
+		return (0);
+	}
+	nfsvers = nfs_vers;
+	if (*tl != nfs_prog) {
+		if (*tl == nqnfs_prog) {
+			nqnfs++;
+			nfsvers = nqnfs_vers;
+		} else {
+			nd->nd_repstat = EPROGUNAVAIL;
+			nd->nd_procnum = NFSPROC_NOOP;
+			return (0);
+		}
+	}
+	tl++;
+	if (*tl++ != nfsvers) {
+		nd->nd_repstat = EPROGMISMATCH;
+		nd->nd_procnum = NFSPROC_NOOP;
+		return (0);
+	}
+	nd->nd_procnum = fxdr_unsigned(u_long, *tl++);
+	if (nd->nd_procnum == NFSPROC_NULL)
+		return (0);
+	if (nd->nd_procnum >= NFS_NPROCS ||
+		(!nqnfs && nd->nd_procnum > NFSPROC_STATFS) ||
+		(*tl != rpc_auth_unix && *tl != rpc_auth_kerb)) {
+		nd->nd_repstat = EPROCUNAVAIL;
+		nd->nd_procnum = NFSPROC_NOOP;
+		return (0);
+	}
+	auth_type = *tl++;
+	len = fxdr_unsigned(int, *tl++);
+	if (len < 0 || len > RPCAUTH_MAXSIZ) {
+		m_freem(mrep);
+		return (EBADRPC);
+	}
+
+	/*
+	 * Handle auth_unix or auth_kerb.
+	 */
+	if (auth_type == rpc_auth_unix) {
+		len = fxdr_unsigned(int, *++tl);
+		if (len < 0 || len > NFS_MAXNAMLEN) {
+			m_freem(mrep);
+			return (EBADRPC);
+		}
+		nfsm_adv(nfsm_rndup(len));
+		nfsm_dissect(tl, u_long *, 3*NFSX_UNSIGNED);
+		nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++);
+		nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++);
+		len = fxdr_unsigned(int, *tl);
+		if (len < 0 || len > RPCAUTH_UNIXGIDS) {
+			m_freem(mrep);
+			return (EBADRPC);
+		}
+		nfsm_dissect(tl, u_long *, (len + 2)*NFSX_UNSIGNED);
+		for (i = 1; i <= len; i++)
+			if (i < NGROUPS)
+				nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++);
+			else
+				tl++;
+		nd->nd_cr.cr_ngroups = (len >= NGROUPS) ? NGROUPS : (len + 1);
+	} else if (auth_type == rpc_auth_kerb) {
+		nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++);
+		nd->nd_authlen = fxdr_unsigned(int, *tl);
+		uio.uio_resid = nfsm_rndup(nd->nd_authlen);
+		if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) {
+			m_freem(mrep);
+			return (EBADRPC);
+		}
+		uio.uio_offset = 0;
+		uio.uio_iov = &iov;
+		uio.uio_iovcnt = 1;
+		uio.uio_segflg = UIO_SYSSPACE;
+		iov.iov_base = (caddr_t)nd->nd_authstr;
+		iov.iov_len = RPCAUTH_MAXSIZ;
+		nfsm_mtouio(&uio, uio.uio_resid);
+		nfsm_dissect(tl, u_long *, 2 * NFSX_UNSIGNED);
+		nd->nd_flag |= NFSD_NEEDAUTH;
+	}
+
+	/*
+	 * Do we have any use for the verifier.
+	 * According to the "Remote Procedure Call Protocol Spec." it
+	 * should be AUTH_NULL, but some clients make it AUTH_UNIX?
+	 * For now, just skip over it
+	 */
+	len = fxdr_unsigned(int, *++tl);
+	if (len < 0 || len > RPCAUTH_MAXSIZ) {
+		m_freem(mrep);
+		return (EBADRPC);
+	}
+	if (len > 0) {
+		nfsm_adv(nfsm_rndup(len));
+	}
+
+	/*
+	 * For nqnfs, get piggybacked lease request.
+	 */
+	if (nqnfs && nd->nd_procnum != NQNFSPROC_EVICTED) {
+		nfsm_dissect(tl, u_long *, NFSX_UNSIGNED);
+		nd->nd_nqlflag = fxdr_unsigned(int, *tl);
+		if (nd->nd_nqlflag) {
+			nfsm_dissect(tl, u_long *, NFSX_UNSIGNED);
+			nd->nd_duration = fxdr_unsigned(int, *tl);
+		} else
+			nd->nd_duration = NQ_MINLEASE;
+	} else {
+		nd->nd_nqlflag = NQL_NOVAL;
+		nd->nd_duration = NQ_MINLEASE;
+	}
+	nd->nd_md = md;
+	nd->nd_dpos = dpos;
+	return (0);
+nfsmout:
+	return (error);
+}
+
+/*
+ * Search for a sleeping nfsd and wake it up.
+ * SIDE EFFECT: If none found, set NFSD_CHECKSLP flag, so that one of the
+ * running nfsds will go look for the work in the nfssvc_sock list.
+ */
+void
+nfsrv_wakenfsd(slp)
+	struct nfssvc_sock *slp;
+{
+	register struct nfsd *nd = nfsd_head.nd_next;
+
+	if ((slp->ns_flag & SLP_VALID) == 0)
+		return;
+	while (nd != (struct nfsd *)&nfsd_head) {
+		if (nd->nd_flag & NFSD_WAITING) {
+			nd->nd_flag &= ~NFSD_WAITING;
+			if (nd->nd_slp)
+				panic("nfsd wakeup");
+			slp->ns_sref++;
+			nd->nd_slp = slp;
+			wakeup((caddr_t)nd);
+			return;
+		}
+		nd = nd->nd_next;
+	}
+	slp->ns_flag |= SLP_DOREC;
+	nfsd_head.nd_flag |= NFSD_CHECKSLP;
+}
+
+nfs_msg(p, server, msg)
+	struct proc *p;
+	char *server, *msg;
+{
+	tpr_t tpr;
+
+	if (p)
+		tpr = tprintf_open(p);
+	else
+		tpr = NULL;
+	tprintf(tpr, "nfs server %s: %s\n", server, msg);
+	tprintf_close(tpr);
+}