kern/sys: Import NFS and NFS file system client

Update #4475

1 files changed, 1436 insertions, 0 deletions

diff --git a/freebsd/sys/fs/nfs/nfs_commonkrpc.c b/freebsd/sys/fs/nfs/nfs_commonkrpc.c
new file mode 100644
index 00000000..f85121f3
--- /dev/null
+++ b/freebsd/sys/fs/nfs/nfs_commonkrpc.c
@@ -0,0 +1,1436 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 1989, 1991, 1993, 1995
+ *	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. 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.
+ *
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * Socket operations for use by nfs
+ */
+
+#include "opt_kgssapi.h"
+#include "opt_nfs.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/limits.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/mount.h>
+#include <sys/mutex.h>
+#include <sys/proc.h>
+#include <sys/signalvar.h>
+#include <sys/syscallsubr.h>
+#include <sys/sysctl.h>
+#include <sys/syslog.h>
+#include <sys/vnode.h>
+
+#include <rpc/rpc.h>
+#include <rpc/krpc.h>
+
+#include <kgssapi/krb5/kcrypto.h>
+
+#include <fs/nfs/nfsport.h>
+
+#ifdef KDTRACE_HOOKS
+#include <sys/dtrace_bsd.h>
+
+dtrace_nfsclient_nfs23_start_probe_func_t
+		dtrace_nfscl_nfs234_start_probe;
+
+dtrace_nfsclient_nfs23_done_probe_func_t
+		dtrace_nfscl_nfs234_done_probe;
+
+/*
+ * Registered probes by RPC type.
+ */
+uint32_t	nfscl_nfs2_start_probes[NFSV41_NPROCS + 1];
+uint32_t	nfscl_nfs2_done_probes[NFSV41_NPROCS + 1];
+
+uint32_t	nfscl_nfs3_start_probes[NFSV41_NPROCS + 1];
+uint32_t	nfscl_nfs3_done_probes[NFSV41_NPROCS + 1];
+
+uint32_t	nfscl_nfs4_start_probes[NFSV41_NPROCS + 1];
+uint32_t	nfscl_nfs4_done_probes[NFSV41_NPROCS + 1];
+#endif
+
+NFSSTATESPINLOCK;
+NFSREQSPINLOCK;
+NFSDLOCKMUTEX;
+NFSCLSTATEMUTEX;
+extern struct nfsstatsv1 nfsstatsv1;
+extern struct nfsreqhead nfsd_reqq;
+extern int nfscl_ticks;
+extern void (*ncl_call_invalcaches)(struct vnode *);
+extern int nfs_numnfscbd;
+extern int nfscl_debuglevel;
+extern int nfsrv_lease;
+
+SVCPOOL		*nfscbd_pool;
+static int	nfsrv_gsscallbackson = 0;
+static int	nfs_bufpackets = 4;
+static int	nfs_reconnects;
+static int	nfs3_jukebox_delay = 10;
+static int	nfs_skip_wcc_data_onerr = 1;
+static int	nfs_dsretries = 2;
+
+SYSCTL_DECL(_vfs_nfs);
+
+SYSCTL_INT(_vfs_nfs, OID_AUTO, bufpackets, CTLFLAG_RW, &nfs_bufpackets, 0,
+    "Buffer reservation size 2 < x < 64");
+SYSCTL_INT(_vfs_nfs, OID_AUTO, reconnects, CTLFLAG_RD, &nfs_reconnects, 0,
+    "Number of times the nfs client has had to reconnect");
+SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs3_jukebox_delay, CTLFLAG_RW, &nfs3_jukebox_delay, 0,
+    "Number of seconds to delay a retry after receiving EJUKEBOX");
+SYSCTL_INT(_vfs_nfs, OID_AUTO, skip_wcc_data_onerr, CTLFLAG_RW, &nfs_skip_wcc_data_onerr, 0,
+    "Disable weak cache consistency checking when server returns an error");
+SYSCTL_INT(_vfs_nfs, OID_AUTO, dsretries, CTLFLAG_RW, &nfs_dsretries, 0,
+    "Number of retries for a DS RPC before failure");
+
+static void	nfs_down(struct nfsmount *, struct thread *, const char *,
+    int, int);
+static void	nfs_up(struct nfsmount *, struct thread *, const char *,
+    int, int);
+static int	nfs_msg(struct thread *, const char *, const char *, int);
+
+struct nfs_cached_auth {
+	int		ca_refs; /* refcount, including 1 from the cache */
+	uid_t		ca_uid;	 /* uid that corresponds to this auth */
+	AUTH		*ca_auth; /* RPC auth handle */
+};
+
+static int nfsv2_procid[NFS_V3NPROCS] = {
+	NFSV2PROC_NULL,
+	NFSV2PROC_GETATTR,
+	NFSV2PROC_SETATTR,
+	NFSV2PROC_LOOKUP,
+	NFSV2PROC_NOOP,
+	NFSV2PROC_READLINK,
+	NFSV2PROC_READ,
+	NFSV2PROC_WRITE,
+	NFSV2PROC_CREATE,
+	NFSV2PROC_MKDIR,
+	NFSV2PROC_SYMLINK,
+	NFSV2PROC_CREATE,
+	NFSV2PROC_REMOVE,
+	NFSV2PROC_RMDIR,
+	NFSV2PROC_RENAME,
+	NFSV2PROC_LINK,
+	NFSV2PROC_READDIR,
+	NFSV2PROC_NOOP,
+	NFSV2PROC_STATFS,
+	NFSV2PROC_NOOP,
+	NFSV2PROC_NOOP,
+	NFSV2PROC_NOOP,
+};
+
+/*
+ * Initialize sockets and congestion for a new NFS connection.
+ * We do not free the sockaddr if error.
+ * Which arguments are set to NULL indicate what kind of call it is.
+ * cred == NULL --> a call to connect to a pNFS DS
+ * nmp == NULL --> indicates an upcall to userland or a NFSv4.0 callback
+ */
+int
+newnfs_connect(struct nfsmount *nmp, struct nfssockreq *nrp,
+    struct ucred *cred, NFSPROC_T *p, int callback_retry_mult)
+{
+	int rcvreserve, sndreserve;
+	int pktscale, pktscalesav;
+	struct sockaddr *saddr;
+	struct ucred *origcred;
+	CLIENT *client;
+	struct netconfig *nconf;
+	struct socket *so;
+	int one = 1, retries, error = 0;
+	struct thread *td = curthread;
+	SVCXPRT *xprt;
+	struct timeval timo;
+
+	/*
+	 * We need to establish the socket using the credentials of
+	 * the mountpoint.  Some parts of this process (such as
+	 * sobind() and soconnect()) will use the curent thread's
+	 * credential instead of the socket credential.  To work
+	 * around this, temporarily change the current thread's
+	 * credential to that of the mountpoint.
+	 *
+	 * XXX: It would be better to explicitly pass the correct
+	 * credential to sobind() and soconnect().
+	 */
+	origcred = td->td_ucred;
+
+	/*
+	 * Use the credential in nr_cred, if not NULL.
+	 */
+	if (nrp->nr_cred != NULL)
+		td->td_ucred = nrp->nr_cred;
+	else
+		td->td_ucred = cred;
+	saddr = nrp->nr_nam;
+
+	if (saddr->sa_family == AF_INET)
+		if (nrp->nr_sotype == SOCK_DGRAM)
+			nconf = getnetconfigent("udp");
+		else
+			nconf = getnetconfigent("tcp");
+	else if (saddr->sa_family == AF_LOCAL)
+		nconf = getnetconfigent("local");
+	else
+		if (nrp->nr_sotype == SOCK_DGRAM)
+			nconf = getnetconfigent("udp6");
+		else
+			nconf = getnetconfigent("tcp6");
+			
+	pktscale = nfs_bufpackets;
+	if (pktscale < 2)
+		pktscale = 2;
+	if (pktscale > 64)
+		pktscale = 64;
+	pktscalesav = pktscale;
+	/*
+	 * soreserve() can fail if sb_max is too small, so shrink pktscale
+	 * and try again if there is an error.
+	 * Print a log message suggesting increasing sb_max.
+	 * Creating a socket and doing this is necessary since, if the
+	 * reservation sizes are too large and will make soreserve() fail,
+	 * the connection will work until a large send is attempted and
+	 * then it will loop in the krpc code.
+	 */
+	so = NULL;
+	saddr = NFSSOCKADDR(nrp->nr_nam, struct sockaddr *);
+	error = socreate(saddr->sa_family, &so, nrp->nr_sotype, 
+	    nrp->nr_soproto, td->td_ucred, td);
+	if (error) {
+		td->td_ucred = origcred;
+		goto out;
+	}
+	do {
+	    if (error != 0 && pktscale > 2) {
+		if (nmp != NULL && nrp->nr_sotype == SOCK_STREAM &&
+		    pktscale == pktscalesav)
+		    printf("Consider increasing kern.ipc.maxsockbuf\n");
+		pktscale--;
+	    }
+	    if (nrp->nr_sotype == SOCK_DGRAM) {
+		if (nmp != NULL) {
+			sndreserve = (NFS_MAXDGRAMDATA + NFS_MAXPKTHDR) *
+			    pktscale;
+			rcvreserve = (NFS_MAXDGRAMDATA + NFS_MAXPKTHDR) *
+			    pktscale;
+		} else {
+			sndreserve = rcvreserve = 1024 * pktscale;
+		}
+	    } else {
+		if (nrp->nr_sotype != SOCK_STREAM)
+			panic("nfscon sotype");
+		if (nmp != NULL) {
+			sndreserve = (NFS_MAXBSIZE + NFS_MAXXDR +
+			    sizeof (u_int32_t)) * pktscale;
+			rcvreserve = (NFS_MAXBSIZE + NFS_MAXXDR +
+			    sizeof (u_int32_t)) * pktscale;
+		} else {
+			sndreserve = rcvreserve = 1024 * pktscale;
+		}
+	    }
+	    error = soreserve(so, sndreserve, rcvreserve);
+	    if (error != 0 && nmp != NULL && nrp->nr_sotype == SOCK_STREAM &&
+		pktscale <= 2)
+		printf("Must increase kern.ipc.maxsockbuf or reduce"
+		    " rsize, wsize\n");
+	} while (error != 0 && pktscale > 2);
+	soclose(so);
+	if (error) {
+		td->td_ucred = origcred;
+		goto out;
+	}
+
+	client = clnt_reconnect_create(nconf, saddr, nrp->nr_prog,
+	    nrp->nr_vers, sndreserve, rcvreserve);
+	CLNT_CONTROL(client, CLSET_WAITCHAN, "nfsreq");
+	if (nmp != NULL) {
+		if ((nmp->nm_flag & NFSMNT_INT))
+			CLNT_CONTROL(client, CLSET_INTERRUPTIBLE, &one);
+		if ((nmp->nm_flag & NFSMNT_RESVPORT))
+			CLNT_CONTROL(client, CLSET_PRIVPORT, &one);
+		if (NFSHASSOFT(nmp)) {
+			if (nmp->nm_sotype == SOCK_DGRAM)
+				/*
+				 * For UDP, the large timeout for a reconnect
+				 * will be set to "nm_retry * nm_timeo / 2", so
+				 * we only want to do 2 reconnect timeout
+				 * retries.
+				 */
+				retries = 2;
+			else
+				retries = nmp->nm_retry;
+		} else
+			retries = INT_MAX;
+		if (NFSHASNFSV4N(nmp)) {
+			if (cred != NULL) {
+				if (NFSHASSOFT(nmp)) {
+					/*
+					 * This should be a DS mount.
+					 * Use CLSET_TIMEOUT to set the timeout
+					 * for connections to DSs instead of
+					 * specifying a timeout on each RPC.
+					 * This is done so that SO_SNDTIMEO
+					 * is set on the TCP socket as well
+					 * as specifying a time limit when
+					 * waiting for an RPC reply.  Useful
+					 * if the send queue for the TCP
+					 * connection has become constipated,
+					 * due to a failed DS.
+					 * The choice of lease_duration / 4 is
+					 * fairly arbitrary, but seems to work
+					 * ok, with a lower bound of 10sec.
+					 */
+					timo.tv_sec = nfsrv_lease / 4;
+					if (timo.tv_sec < 10)
+						timo.tv_sec = 10;
+					timo.tv_usec = 0;
+					CLNT_CONTROL(client, CLSET_TIMEOUT,
+					    &timo);
+				}
+				/*
+				 * Make sure the nfscbd_pool doesn't get
+				 * destroyed while doing this.
+				 */
+				NFSD_LOCK();
+				if (nfs_numnfscbd > 0) {
+					nfs_numnfscbd++;
+					NFSD_UNLOCK();
+					xprt = svc_vc_create_backchannel(
+					    nfscbd_pool);
+					CLNT_CONTROL(client, CLSET_BACKCHANNEL,
+					    xprt);
+					NFSD_LOCK();
+					nfs_numnfscbd--;
+					if (nfs_numnfscbd == 0)
+						wakeup(&nfs_numnfscbd);
+				}
+				NFSD_UNLOCK();
+			} else {
+				/*
+				 * cred == NULL for a DS connect.
+				 * For connects to a DS, set a retry limit
+				 * so that failed DSs will be detected.
+				 * This is ok for NFSv4.1, since a DS does
+				 * not maintain open/lock state and is the
+				 * only case where using a "soft" mount is
+				 * recommended for NFSv4.
+				 * For mounts from the MDS to DS, this is done
+				 * via mount options, but that is not the case
+				 * here.  The retry limit here can be adjusted
+				 * via the sysctl vfs.nfs.dsretries.
+				 * See the comment above w.r.t. timeout.
+				 */
+				timo.tv_sec = nfsrv_lease / 4;
+				if (timo.tv_sec < 10)
+					timo.tv_sec = 10;
+				timo.tv_usec = 0;
+				CLNT_CONTROL(client, CLSET_TIMEOUT, &timo);
+				retries = nfs_dsretries;
+			}
+		}
+	} else {
+		/*
+		 * Three cases:
+		 * - Null RPC callback to client
+		 * - Non-Null RPC callback to client, wait a little longer
+		 * - upcalls to nfsuserd and gssd (clp == NULL)
+		 */
+		if (callback_retry_mult == 0) {
+			retries = NFSV4_UPCALLRETRY;
+			CLNT_CONTROL(client, CLSET_PRIVPORT, &one);
+		} else {
+			retries = NFSV4_CALLBACKRETRY * callback_retry_mult;
+		}
+	}
+	CLNT_CONTROL(client, CLSET_RETRIES, &retries);
+
+	if (nmp != NULL) {
+		/*
+		 * For UDP, there are 2 timeouts:
+		 * - CLSET_RETRY_TIMEOUT sets the initial timeout for the timer
+		 *   that does a retransmit of an RPC request using the same 
+		 *   socket and xid. This is what you normally want to do,
+		 *   since NFS servers depend on "same xid" for their
+		 *   Duplicate Request Cache.
+		 * - timeout specified in CLNT_CALL_MBUF(), which specifies when
+		 *   retransmits on the same socket should fail and a fresh
+		 *   socket created. Each of these timeouts counts as one
+		 *   CLSET_RETRIES as set above.
+		 * Set the initial retransmit timeout for UDP. This timeout
+		 * doesn't exist for TCP and the following call just fails,
+		 * which is ok.
+		 */
+		timo.tv_sec = nmp->nm_timeo / NFS_HZ;
+		timo.tv_usec = (nmp->nm_timeo % NFS_HZ) * 1000000 / NFS_HZ;
+		CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, &timo);
+	}
+
+	mtx_lock(&nrp->nr_mtx);
+	if (nrp->nr_client != NULL) {
+		mtx_unlock(&nrp->nr_mtx);
+		/*
+		 * Someone else already connected.
+		 */
+		CLNT_RELEASE(client);
+	} else {
+		nrp->nr_client = client;
+		/*
+		 * Protocols that do not require connections may be optionally
+		 * left unconnected for servers that reply from a port other
+		 * than NFS_PORT.
+		 */
+		if (nmp == NULL || (nmp->nm_flag & NFSMNT_NOCONN) == 0) {
+			mtx_unlock(&nrp->nr_mtx);
+			CLNT_CONTROL(client, CLSET_CONNECT, &one);
+		} else
+			mtx_unlock(&nrp->nr_mtx);
+	}
+
+
+	/* Restore current thread's credentials. */
+	td->td_ucred = origcred;
+
+out:
+	NFSEXITCODE(error);
+	return (error);
+}
+
+/*
+ * NFS disconnect. Clean up and unlink.
+ */
+void
+newnfs_disconnect(struct nfssockreq *nrp)
+{
+	CLIENT *client;
+
+	mtx_lock(&nrp->nr_mtx);
+	if (nrp->nr_client != NULL) {
+		client = nrp->nr_client;
+		nrp->nr_client = NULL;
+		mtx_unlock(&nrp->nr_mtx);
+		rpc_gss_secpurge_call(client);
+		CLNT_CLOSE(client);
+		CLNT_RELEASE(client);
+	} else {
+		mtx_unlock(&nrp->nr_mtx);
+	}
+}
+
+static AUTH *
+nfs_getauth(struct nfssockreq *nrp, int secflavour, char *clnt_principal,
+    char *srv_principal, gss_OID mech_oid, struct ucred *cred)
+{
+	rpc_gss_service_t svc;
+	AUTH *auth;
+
+	switch (secflavour) {
+	case RPCSEC_GSS_KRB5:
+	case RPCSEC_GSS_KRB5I:
+	case RPCSEC_GSS_KRB5P:
+		if (!mech_oid) {
+			if (!rpc_gss_mech_to_oid_call("kerberosv5", &mech_oid))
+				return (NULL);
+		}
+		if (secflavour == RPCSEC_GSS_KRB5)
+			svc = rpc_gss_svc_none;
+		else if (secflavour == RPCSEC_GSS_KRB5I)
+			svc = rpc_gss_svc_integrity;
+		else
+			svc = rpc_gss_svc_privacy;
+
+		if (clnt_principal == NULL)
+			auth = rpc_gss_secfind_call(nrp->nr_client, cred,
+			    srv_principal, mech_oid, svc);
+		else {
+			auth = rpc_gss_seccreate_call(nrp->nr_client, cred,
+			    clnt_principal, srv_principal, "kerberosv5",
+			    svc, NULL, NULL, NULL);
+			return (auth);
+		}
+		if (auth != NULL)
+			return (auth);
+		/* fallthrough */
+	case AUTH_SYS:
+	default:
+		return (authunix_create(cred));
+
+	}
+}
+
+/*
+ * Callback from the RPC code to generate up/down notifications.
+ */
+
+struct nfs_feedback_arg {
+	struct nfsmount *nf_mount;
+	int		nf_lastmsg;	/* last tprintf */
+	int		nf_tprintfmsg;
+	struct thread	*nf_td;
+};
+
+static void
+nfs_feedback(int type, int proc, void *arg)
+{
+	struct nfs_feedback_arg *nf = (struct nfs_feedback_arg *) arg;
+	struct nfsmount *nmp = nf->nf_mount;
+	time_t now;
+
+	switch (type) {
+	case FEEDBACK_REXMIT2:
+	case FEEDBACK_RECONNECT:
+		now = NFSD_MONOSEC;
+		if (nf->nf_lastmsg + nmp->nm_tprintf_delay < now) {
+			nfs_down(nmp, nf->nf_td,
+			    "not responding", 0, NFSSTA_TIMEO);
+			nf->nf_tprintfmsg = TRUE;
+			nf->nf_lastmsg = now;
+		}
+		break;
+
+	case FEEDBACK_OK:
+		nfs_up(nf->nf_mount, nf->nf_td,
+		    "is alive again", NFSSTA_TIMEO, nf->nf_tprintfmsg);
+		break;
+	}
+}
+
+/*
+ * newnfs_request - goes something like this
+ *	- does the rpc by calling the krpc layer
+ *	- break down rpc header and return with nfs reply
+ * nb: always frees up nd_mreq mbuf list
+ */
+int
+newnfs_request(struct nfsrv_descript *nd, struct nfsmount *nmp,
+    struct nfsclient *clp, struct nfssockreq *nrp, vnode_t vp,
+    struct thread *td, struct ucred *cred, u_int32_t prog, u_int32_t vers,
+    u_char *retsum, int toplevel, u_int64_t *xidp, struct nfsclsession *dssep)
+{
+	uint32_t retseq, retval, slotseq, *tl;
+	time_t waituntil;
+	int i = 0, j = 0, opcnt, set_sigset = 0, slot;
+	int error = 0, usegssname = 0, secflavour = AUTH_SYS;
+	int freeslot, maxslot, reterr, slotpos, timeo;
+	u_int16_t procnum;
+	u_int trylater_delay = 1;
+	struct nfs_feedback_arg nf;
+	struct timeval timo;
+	AUTH *auth;
+	struct rpc_callextra ext;
+	enum clnt_stat stat;
+	struct nfsreq *rep = NULL;
+	char *srv_principal = NULL, *clnt_principal = NULL;
+	sigset_t oldset;
+	struct ucred *authcred;
+	struct nfsclsession *sep;
+	uint8_t sessionid[NFSX_V4SESSIONID];
+
+	sep = dssep;
+	if (xidp != NULL)
+		*xidp = 0;
+	/* Reject requests while attempting a forced unmount. */
+	if (nmp != NULL && NFSCL_FORCEDISM(nmp->nm_mountp)) {
+		m_freem(nd->nd_mreq);
+		return (ESTALE);
+	}
+
+	/*
+	 * Set authcred, which is used to acquire RPC credentials to
+	 * the cred argument, by default. The crhold() should not be
+	 * necessary, but will ensure that some future code change
+	 * doesn't result in the credential being free'd prematurely.
+	 */
+	authcred = crhold(cred);
+
+	/* For client side interruptible mounts, mask off the signals. */
+	if (nmp != NULL && td != NULL && NFSHASINT(nmp)) {
+		newnfs_set_sigmask(td, &oldset);
+		set_sigset = 1;
+	}
+
+	/*
+	 * XXX if not already connected call nfs_connect now. Longer
+	 * term, change nfs_mount to call nfs_connect unconditionally
+	 * and let clnt_reconnect_create handle reconnects.
+	 */
+	if (nrp->nr_client == NULL)
+		newnfs_connect(nmp, nrp, cred, td, 0);
+
+	/*
+	 * For a client side mount, nmp is != NULL and clp == NULL. For
+	 * server calls (callbacks or upcalls), nmp == NULL.
+	 */
+	if (clp != NULL) {
+		NFSLOCKSTATE();
+		if ((clp->lc_flags & LCL_GSS) && nfsrv_gsscallbackson) {
+			secflavour = RPCSEC_GSS_KRB5;
+			if (nd->nd_procnum != NFSPROC_NULL) {
+				if (clp->lc_flags & LCL_GSSINTEGRITY)
+					secflavour = RPCSEC_GSS_KRB5I;
+				else if (clp->lc_flags & LCL_GSSPRIVACY)
+					secflavour = RPCSEC_GSS_KRB5P;
+			}
+		}
+		NFSUNLOCKSTATE();
+	} else if (nmp != NULL && NFSHASKERB(nmp) &&
+	     nd->nd_procnum != NFSPROC_NULL) {
+		if (NFSHASALLGSSNAME(nmp) && nmp->nm_krbnamelen > 0)
+			nd->nd_flag |= ND_USEGSSNAME;
+		if ((nd->nd_flag & ND_USEGSSNAME) != 0) {
+			/*
+			 * If there is a client side host based credential,
+			 * use that, otherwise use the system uid, if set.
+			 * The system uid is in the nmp->nm_sockreq.nr_cred
+			 * credentials.
+			 */
+			if (nmp->nm_krbnamelen > 0) {
+				usegssname = 1;
+				clnt_principal = nmp->nm_krbname;
+			} else if (nmp->nm_uid != (uid_t)-1) {
+				KASSERT(nmp->nm_sockreq.nr_cred != NULL,
+				    ("newnfs_request: NULL nr_cred"));
+				crfree(authcred);
+				authcred = crhold(nmp->nm_sockreq.nr_cred);
+			}
+		} else if (nmp->nm_krbnamelen == 0 &&
+		    nmp->nm_uid != (uid_t)-1 && cred->cr_uid == (uid_t)0) {
+			/*
+			 * If there is no host based principal name and
+			 * the system uid is set and this is root, use the
+			 * system uid, since root won't have user
+			 * credentials in a credentials cache file.
+			 * The system uid is in the nmp->nm_sockreq.nr_cred
+			 * credentials.
+			 */
+			KASSERT(nmp->nm_sockreq.nr_cred != NULL,
+			    ("newnfs_request: NULL nr_cred"));
+			crfree(authcred);
+			authcred = crhold(nmp->nm_sockreq.nr_cred);
+		}
+		if (NFSHASINTEGRITY(nmp))
+			secflavour = RPCSEC_GSS_KRB5I;
+		else if (NFSHASPRIVACY(nmp))
+			secflavour = RPCSEC_GSS_KRB5P;
+		else
+			secflavour = RPCSEC_GSS_KRB5;
+		srv_principal = NFSMNT_SRVKRBNAME(nmp);
+	} else if (nmp != NULL && !NFSHASKERB(nmp) &&
+	    nd->nd_procnum != NFSPROC_NULL &&
+	    (nd->nd_flag & ND_USEGSSNAME) != 0) {
+		/*
+		 * Use the uid that did the mount when the RPC is doing
+		 * NFSv4 system operations, as indicated by the
+		 * ND_USEGSSNAME flag, for the AUTH_SYS case.
+		 * The credentials in nm_sockreq.nr_cred were used for the
+		 * mount.
+		 */
+		KASSERT(nmp->nm_sockreq.nr_cred != NULL,
+		    ("newnfs_request: NULL nr_cred"));
+		crfree(authcred);
+		authcred = crhold(nmp->nm_sockreq.nr_cred);
+	}
+
+	if (nmp != NULL) {
+		bzero(&nf, sizeof(struct nfs_feedback_arg));
+		nf.nf_mount = nmp;
+		nf.nf_td = td;
+		nf.nf_lastmsg = NFSD_MONOSEC -
+		    ((nmp->nm_tprintf_delay)-(nmp->nm_tprintf_initial_delay));
+	}
+
+	if (nd->nd_procnum == NFSPROC_NULL)
+		auth = authnone_create();
+	else if (usegssname) {
+		/*
+		 * For this case, the authenticator is held in the
+		 * nfssockreq structure, so don't release the reference count
+		 * held on it. --> Don't AUTH_DESTROY() it in this function.
+		 */
+		if (nrp->nr_auth == NULL)
+			nrp->nr_auth = nfs_getauth(nrp, secflavour,
+			    clnt_principal, srv_principal, NULL, authcred);
+		else
+			rpc_gss_refresh_auth_call(nrp->nr_auth);
+		auth = nrp->nr_auth;
+	} else
+		auth = nfs_getauth(nrp, secflavour, NULL,
+		    srv_principal, NULL, authcred);
+	crfree(authcred);
+	if (auth == NULL) {
+		m_freem(nd->nd_mreq);
+		if (set_sigset)
+			newnfs_restore_sigmask(td, &oldset);
+		return (EACCES);
+	}
+	bzero(&ext, sizeof(ext));
+	ext.rc_auth = auth;
+	if (nmp != NULL) {
+		ext.rc_feedback = nfs_feedback;
+		ext.rc_feedback_arg = &nf;
+	}
+
+	procnum = nd->nd_procnum;
+	if ((nd->nd_flag & ND_NFSV4) &&
+	    nd->nd_procnum != NFSPROC_NULL &&
+	    nd->nd_procnum != NFSV4PROC_CBCOMPOUND)
+		procnum = NFSV4PROC_COMPOUND;
+
+	if (nmp != NULL) {
+		NFSINCRGLOBAL(nfsstatsv1.rpcrequests);
+
+		/* Map the procnum to the old NFSv2 one, as required. */
+		if ((nd->nd_flag & ND_NFSV2) != 0) {
+			if (nd->nd_procnum < NFS_V3NPROCS)
+				procnum = nfsv2_procid[nd->nd_procnum];
+			else
+				procnum = NFSV2PROC_NOOP;
+		}
+
+		/*
+		 * Now only used for the R_DONTRECOVER case, but until that is
+		 * supported within the krpc code, I need to keep a queue of
+		 * outstanding RPCs for nfsv4 client requests.
+		 */
+		if ((nd->nd_flag & ND_NFSV4) && procnum == NFSV4PROC_COMPOUND)
+			rep = malloc(sizeof(struct nfsreq),
+			    M_NFSDREQ, M_WAITOK);
+#ifdef KDTRACE_HOOKS
+		if (dtrace_nfscl_nfs234_start_probe != NULL) {
+			uint32_t probe_id;
+			int probe_procnum;
+	
+			if (nd->nd_flag & ND_NFSV4) {
+				probe_id =
+				    nfscl_nfs4_start_probes[nd->nd_procnum];
+				probe_procnum = nd->nd_procnum;
+			} else if (nd->nd_flag & ND_NFSV3) {
+				probe_id = nfscl_nfs3_start_probes[procnum];
+				probe_procnum = procnum;
+			} else {
+				probe_id =
+				    nfscl_nfs2_start_probes[nd->nd_procnum];
+				probe_procnum = procnum;
+			}
+			if (probe_id != 0)
+				(dtrace_nfscl_nfs234_start_probe)
+				    (probe_id, vp, nd->nd_mreq, cred,
+				     probe_procnum);
+		}
+#endif
+	}
+	freeslot = -1;		/* Set to slot that needs to be free'd */
+tryagain:
+	slot = -1;		/* Slot that needs a sequence# increment. */
+	/*
+	 * This timeout specifies when a new socket should be created,
+	 * along with new xid values. For UDP, this should be done
+	 * infrequently, since retransmits of RPC requests should normally
+	 * use the same xid.
+	 */
+	if (nmp == NULL) {
+		timo.tv_usec = 0;
+		if (clp == NULL)
+			timo.tv_sec = NFSV4_UPCALLTIMEO;
+		else
+			timo.tv_sec = NFSV4_CALLBACKTIMEO;
+	} else {
+		if (nrp->nr_sotype != SOCK_DGRAM) {
+			timo.tv_usec = 0;
+			if ((nmp->nm_flag & NFSMNT_NFSV4))
+				timo.tv_sec = INT_MAX;
+			else
+				timo.tv_sec = NFS_TCPTIMEO;
+		} else {
+			if (NFSHASSOFT(nmp)) {
+				/*
+				 * CLSET_RETRIES is set to 2, so this should be
+				 * half of the total timeout required.
+				 */
+				timeo = nmp->nm_retry * nmp->nm_timeo / 2;
+				if (timeo < 1)
+					timeo = 1;
+				timo.tv_sec = timeo / NFS_HZ;
+				timo.tv_usec = (timeo % NFS_HZ) * 1000000 /
+				    NFS_HZ;
+			} else {
+				/* For UDP hard mounts, use a large value. */
+				timo.tv_sec = NFS_MAXTIMEO / NFS_HZ;
+				timo.tv_usec = 0;
+			}
+		}
+
+		if (rep != NULL) {
+			rep->r_flags = 0;
+			rep->r_nmp = nmp;
+			/*
+			 * Chain request into list of outstanding requests.
+			 */
+			NFSLOCKREQ();
+			TAILQ_INSERT_TAIL(&nfsd_reqq, rep, r_chain);
+			NFSUNLOCKREQ();
+		}
+	}
+
+	nd->nd_mrep = NULL;
+	if (clp != NULL && sep != NULL)
+		stat = clnt_bck_call(nrp->nr_client, &ext, procnum,
+		    nd->nd_mreq, &nd->nd_mrep, timo, sep->nfsess_xprt);
+	else
+		stat = CLNT_CALL_MBUF(nrp->nr_client, &ext, procnum,
+		    nd->nd_mreq, &nd->nd_mrep, timo);
+	NFSCL_DEBUG(2, "clnt call=%d\n", stat);
+
+	if (rep != NULL) {
+		/*
+		 * RPC done, unlink the request.
+		 */
+		NFSLOCKREQ();
+		TAILQ_REMOVE(&nfsd_reqq, rep, r_chain);
+		NFSUNLOCKREQ();
+	}
+
+	/*
+	 * If there was a successful reply and a tprintf msg.
+	 * tprintf a response.
+	 */
+	if (stat == RPC_SUCCESS) {
+		error = 0;
+	} else if (stat == RPC_TIMEDOUT) {
+		NFSINCRGLOBAL(nfsstatsv1.rpctimeouts);
+		error = ETIMEDOUT;
+	} else if (stat == RPC_VERSMISMATCH) {
+		NFSINCRGLOBAL(nfsstatsv1.rpcinvalid);
+		error = EOPNOTSUPP;
+	} else if (stat == RPC_PROGVERSMISMATCH) {
+		NFSINCRGLOBAL(nfsstatsv1.rpcinvalid);
+		error = EPROTONOSUPPORT;
+	} else if (stat == RPC_INTR) {
+		error = EINTR;
+	} else if (stat == RPC_CANTSEND || stat == RPC_CANTRECV ||
+	     stat == RPC_SYSTEMERROR) {
+		/* Check for a session slot that needs to be free'd. */
+		if ((nd->nd_flag & (ND_NFSV41 | ND_HASSLOTID)) ==
+		    (ND_NFSV41 | ND_HASSLOTID) && nmp != NULL &&
+		    nd->nd_procnum != NFSPROC_NULL) {
+			/*
+			 * This should only occur when either the MDS or
+			 * a client has an RPC against a DS fail.
+			 * This happens because these cases use "soft"
+			 * connections that can time out and fail.
+			 * The slot used for this RPC is now in a
+			 * non-deterministic state, but if the slot isn't
+			 * free'd, threads can get stuck waiting for a slot.
+			 */
+			if (sep == NULL)
+				sep = nfsmnt_mdssession(nmp);
+			/*
+			 * Bump the sequence# out of range, so that reuse of
+			 * this slot will result in an NFSERR_SEQMISORDERED
+			 * error and not a bogus cached RPC reply.
+			 */
+			mtx_lock(&sep->nfsess_mtx);
+			sep->nfsess_slotseq[nd->nd_slotid] += 10;
+			mtx_unlock(&sep->nfsess_mtx);
+			/* And free the slot. */
+			nfsv4_freeslot(sep, nd->nd_slotid);
+		}
+		NFSINCRGLOBAL(nfsstatsv1.rpcinvalid);
+		error = ENXIO;
+	} else {
+		NFSINCRGLOBAL(nfsstatsv1.rpcinvalid);
+		error = EACCES;
+	}
+	if (error) {
+		m_freem(nd->nd_mreq);
+		if (usegssname == 0)
+			AUTH_DESTROY(auth);
+		if (rep != NULL)
+			free(rep, M_NFSDREQ);
+		if (set_sigset)
+			newnfs_restore_sigmask(td, &oldset);
+		return (error);
+	}
+
+	KASSERT(nd->nd_mrep != NULL, ("mrep shouldn't be NULL if no error\n"));
+
+	/*
+	 * 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.
+	 */
+	newnfs_realign(&nd->nd_mrep, M_WAITOK);
+	nd->nd_md = nd->nd_mrep;
+	nd->nd_dpos = NFSMTOD(nd->nd_md, caddr_t);
+	nd->nd_repstat = 0;
+	if (nd->nd_procnum != NFSPROC_NULL &&
+	    nd->nd_procnum != NFSV4PROC_CBNULL) {
+		/* If sep == NULL, set it to the default in nmp. */
+		if (sep == NULL && nmp != NULL)
+			sep = nfsmnt_mdssession(nmp);
+		/*
+		 * and now the actual NFS xdr.
+		 */
+		NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
+		nd->nd_repstat = fxdr_unsigned(u_int32_t, *tl);
+		if (nd->nd_repstat >= 10000)
+			NFSCL_DEBUG(1, "proc=%d reps=%d\n", (int)nd->nd_procnum,
+			    (int)nd->nd_repstat);
+
+		/*
+		 * Get rid of the tag, return count and SEQUENCE result for
+		 * NFSv4.
+		 */
+		if ((nd->nd_flag & ND_NFSV4) != 0 && nd->nd_repstat !=
+		    NFSERR_MINORVERMISMATCH) {
+			NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
+			i = fxdr_unsigned(int, *tl);
+			error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
+			if (error)
+				goto nfsmout;
+			NFSM_DISSECT(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
+			opcnt = fxdr_unsigned(int, *tl++);
+			i = fxdr_unsigned(int, *tl++);
+			j = fxdr_unsigned(int, *tl);
+			if (j >= 10000)
+				NFSCL_DEBUG(1, "fop=%d fst=%d\n", i, j);
+			/*
+			 * If the first op is Sequence, free up the slot.
+			 */
+			if ((nmp != NULL && i == NFSV4OP_SEQUENCE && j != 0) ||
+			    (clp != NULL && i == NFSV4OP_CBSEQUENCE && j != 0))
+				NFSCL_DEBUG(1, "failed seq=%d\n", j);
+			if (((nmp != NULL && i == NFSV4OP_SEQUENCE && j == 0) ||
+			    (clp != NULL && i == NFSV4OP_CBSEQUENCE &&
+			    j == 0)) && sep != NULL) {
+				if (i == NFSV4OP_SEQUENCE)
+					NFSM_DISSECT(tl, uint32_t *,
+					    NFSX_V4SESSIONID +
+					    5 * NFSX_UNSIGNED);
+				else
+					NFSM_DISSECT(tl, uint32_t *,
+					    NFSX_V4SESSIONID +
+					    4 * NFSX_UNSIGNED);
+				mtx_lock(&sep->nfsess_mtx);
+				if (bcmp(tl, sep->nfsess_sessionid,
+				    NFSX_V4SESSIONID) == 0) {
+					tl += NFSX_V4SESSIONID / NFSX_UNSIGNED;
+					retseq = fxdr_unsigned(uint32_t, *tl++);
+					slot = fxdr_unsigned(int, *tl++);
+					freeslot = slot;
+					if (retseq != sep->nfsess_slotseq[slot])
+						printf("retseq diff 0x%x\n",
+						    retseq);
+					retval = fxdr_unsigned(uint32_t, *++tl);
+					if ((retval + 1) < sep->nfsess_foreslots
+					    )
+						sep->nfsess_foreslots = (retval
+						    + 1);
+					else if ((retval + 1) >
+					    sep->nfsess_foreslots)
+						sep->nfsess_foreslots = (retval
+						    < 64) ? (retval + 1) : 64;
+				}
+				mtx_unlock(&sep->nfsess_mtx);
+
+				/* Grab the op and status for the next one. */
+				if (opcnt > 1) {
+					NFSM_DISSECT(tl, uint32_t *,
+					    2 * NFSX_UNSIGNED);
+					i = fxdr_unsigned(int, *tl++);
+					j = fxdr_unsigned(int, *tl);
+				}
+			}
+		}
+		if (nd->nd_repstat != 0) {
+			if (nd->nd_repstat == NFSERR_BADSESSION &&
+			    nmp != NULL && dssep == NULL &&
+			    (nd->nd_flag & ND_NFSV41) != 0) {
+				/*
+				 * If this is a client side MDS RPC, mark
+				 * the MDS session defunct and initiate
+				 * recovery, as required.
+				 * The nfsess_defunct field is protected by
+				 * the NFSLOCKMNT()/nm_mtx lock and not the
+				 * nfsess_mtx lock to simplify its handling,
+				 * for the MDS session. This lock is also
+				 * sufficient for nfsess_sessionid, since it
+				 * never changes in the structure.
+				 */
+				NFSCL_DEBUG(1, "Got badsession\n");
+				NFSLOCKCLSTATE();
+				NFSLOCKMNT(nmp);
+				sep = NFSMNT_MDSSESSION(nmp);
+				if (bcmp(sep->nfsess_sessionid, nd->nd_sequence,
+				    NFSX_V4SESSIONID) == 0) {
+					/* Initiate recovery. */
+					sep->nfsess_defunct = 1;
+					NFSCL_DEBUG(1, "Marked defunct\n");
+					if (nmp->nm_clp != NULL) {
+						nmp->nm_clp->nfsc_flags |=
+						    NFSCLFLAGS_RECOVER;
+						wakeup(nmp->nm_clp);
+					}
+				}
+				NFSUNLOCKCLSTATE();
+				/*
+				 * Sleep for up to 1sec waiting for a new
+				 * session.
+				 */
+				mtx_sleep(&nmp->nm_sess, &nmp->nm_mtx, PZERO,
+				    "nfsbadsess", hz);
+				/*
+				 * Get the session again, in case a new one
+				 * has been created during the sleep.
+				 */
+				sep = NFSMNT_MDSSESSION(nmp);
+				NFSUNLOCKMNT(nmp);
+				if ((nd->nd_flag & ND_LOOPBADSESS) != 0) {
+					reterr = nfsv4_sequencelookup(nmp, sep,
+					    &slotpos, &maxslot, &slotseq,
+					    sessionid);
+					if (reterr == 0) {
+						/* Fill in new session info. */
+						NFSCL_DEBUG(1,
+						  "Filling in new sequence\n");
+						tl = nd->nd_sequence;
+						bcopy(sessionid, tl,
+						    NFSX_V4SESSIONID);
+						tl += NFSX_V4SESSIONID /
+						    NFSX_UNSIGNED;
+						*tl++ = txdr_unsigned(slotseq);
+						*tl++ = txdr_unsigned(slotpos);
+						*tl = txdr_unsigned(maxslot);
+					}
+					if (reterr == NFSERR_BADSESSION ||
+					    reterr == 0) {
+						NFSCL_DEBUG(1,
+						    "Badsession looping\n");
+						m_freem(nd->nd_mrep);
+						nd->nd_mrep = NULL;
+						goto tryagain;
+					}
+					nd->nd_repstat = reterr;
+					NFSCL_DEBUG(1, "Got err=%d\n", reterr);
+				}
+			}
+			/*
+			 * When clp != NULL, it is a callback and all
+			 * callback operations can be retried for NFSERR_DELAY.
+			 */
+			if (((nd->nd_repstat == NFSERR_DELAY ||
+			      nd->nd_repstat == NFSERR_GRACE) &&
+			     (nd->nd_flag & ND_NFSV4) && (clp != NULL ||
+			     (nd->nd_procnum != NFSPROC_DELEGRETURN &&
+			     nd->nd_procnum != NFSPROC_SETATTR &&
+			     nd->nd_procnum != NFSPROC_READ &&
+			     nd->nd_procnum != NFSPROC_READDS &&
+			     nd->nd_procnum != NFSPROC_WRITE &&
+			     nd->nd_procnum != NFSPROC_WRITEDS &&
+			     nd->nd_procnum != NFSPROC_OPEN &&
+			     nd->nd_procnum != NFSPROC_CREATE &&
+			     nd->nd_procnum != NFSPROC_OPENCONFIRM &&
+			     nd->nd_procnum != NFSPROC_OPENDOWNGRADE &&
+			     nd->nd_procnum != NFSPROC_CLOSE &&
+			     nd->nd_procnum != NFSPROC_LOCK &&
+			     nd->nd_procnum != NFSPROC_LOCKU))) ||
+			    (nd->nd_repstat == NFSERR_DELAY &&
+			     (nd->nd_flag & ND_NFSV4) == 0) ||
+			    nd->nd_repstat == NFSERR_RESOURCE) {
+				if (trylater_delay > NFS_TRYLATERDEL)
+					trylater_delay = NFS_TRYLATERDEL;
+				waituntil = NFSD_MONOSEC + trylater_delay;
+				while (NFSD_MONOSEC < waituntil)
+					(void) nfs_catnap(PZERO, 0, "nfstry");
+				trylater_delay *= 2;
+				if (slot != -1) {
+					mtx_lock(&sep->nfsess_mtx);
+					sep->nfsess_slotseq[slot]++;
+					*nd->nd_slotseq = txdr_unsigned(
+					    sep->nfsess_slotseq[slot]);
+					mtx_unlock(&sep->nfsess_mtx);
+				}
+				m_freem(nd->nd_mrep);
+				nd->nd_mrep = NULL;
+				goto tryagain;
+			}
+
+			/*
+			 * If the File Handle was stale, invalidate the
+			 * lookup cache, just in case.
+			 * (vp != NULL implies a client side call)
+			 */
+			if (nd->nd_repstat == ESTALE && vp != NULL) {
+				cache_purge(vp);
+				if (ncl_call_invalcaches != NULL)
+					(*ncl_call_invalcaches)(vp);
+			}
+		}
+		if ((nd->nd_flag & ND_NFSV4) != 0) {
+			/* Free the slot, as required. */
+			if (freeslot != -1)
+				nfsv4_freeslot(sep, freeslot);
+			/*
+			 * If this op is Putfh, throw its results away.
+			 */
+			if (j >= 10000)
+				NFSCL_DEBUG(1, "nop=%d nst=%d\n", i, j);
+			if (nmp != NULL && i == NFSV4OP_PUTFH && j == 0) {
+				NFSM_DISSECT(tl,u_int32_t *,2 * NFSX_UNSIGNED);
+				i = fxdr_unsigned(int, *tl++);
+				j = fxdr_unsigned(int, *tl);
+				if (j >= 10000)
+					NFSCL_DEBUG(1, "n2op=%d n2st=%d\n", i,
+					    j);
+				/*
+				 * All Compounds that do an Op that must
+				 * be in sequence consist of NFSV4OP_PUTFH
+				 * followed by one of these. As such, we
+				 * can determine if the seqid# should be
+				 * incremented, here.
+				 */
+				if ((i == NFSV4OP_OPEN ||
+				     i == NFSV4OP_OPENCONFIRM ||
+				     i == NFSV4OP_OPENDOWNGRADE ||
+				     i == NFSV4OP_CLOSE ||
+				     i == NFSV4OP_LOCK ||
+				     i == NFSV4OP_LOCKU) &&
+				    (j == 0 ||
+				     (j != NFSERR_STALECLIENTID &&
+				      j != NFSERR_STALESTATEID &&
+				      j != NFSERR_BADSTATEID &&
+				      j != NFSERR_BADSEQID &&
+				      j != NFSERR_BADXDR &&	 
+				      j != NFSERR_RESOURCE &&
+				      j != NFSERR_NOFILEHANDLE)))		 
+					nd->nd_flag |= ND_INCRSEQID;
+			}
+			/*
+			 * If this op's status is non-zero, mark
+			 * that there is no more data to process.
+			 * The exception is Setattr, which always has xdr
+			 * when it has failed.
+			 */
+			if (j != 0 && i != NFSV4OP_SETATTR)
+				nd->nd_flag |= ND_NOMOREDATA;
+
+			/*
+			 * If R_DONTRECOVER is set, replace the stale error
+			 * reply, so that recovery isn't initiated.
+			 */
+			if ((nd->nd_repstat == NFSERR_STALECLIENTID ||
+			     nd->nd_repstat == NFSERR_BADSESSION ||
+			     nd->nd_repstat == NFSERR_STALESTATEID) &&
+			    rep != NULL && (rep->r_flags & R_DONTRECOVER))
+				nd->nd_repstat = NFSERR_STALEDONTRECOVER;
+		}
+	}
+
+#ifdef KDTRACE_HOOKS
+	if (nmp != NULL && dtrace_nfscl_nfs234_done_probe != NULL) {
+		uint32_t probe_id;
+		int probe_procnum;
+
+		if (nd->nd_flag & ND_NFSV4) {
+			probe_id = nfscl_nfs4_done_probes[nd->nd_procnum];
+			probe_procnum = nd->nd_procnum;
+		} else if (nd->nd_flag & ND_NFSV3) {
+			probe_id = nfscl_nfs3_done_probes[procnum];
+			probe_procnum = procnum;
+		} else {
+			probe_id = nfscl_nfs2_done_probes[nd->nd_procnum];
+			probe_procnum = procnum;
+		}
+		if (probe_id != 0)
+			(dtrace_nfscl_nfs234_done_probe)(probe_id, vp,
+			    nd->nd_mreq, cred, probe_procnum, 0);
+	}
+#endif
+
+	m_freem(nd->nd_mreq);
+	if (usegssname == 0)
+		AUTH_DESTROY(auth);
+	if (rep != NULL)
+		free(rep, M_NFSDREQ);
+	if (set_sigset)
+		newnfs_restore_sigmask(td, &oldset);
+	return (0);
+nfsmout:
+	mbuf_freem(nd->nd_mrep);
+	mbuf_freem(nd->nd_mreq);
+	if (usegssname == 0)
+		AUTH_DESTROY(auth);
+	if (rep != NULL)
+		free(rep, M_NFSDREQ);
+	if (set_sigset)
+		newnfs_restore_sigmask(td, &oldset);
+	return (error);
+}
+
+/*
+ * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and
+ * wait for all requests to complete. This is used by forced unmounts
+ * to terminate any outstanding RPCs.
+ */
+int
+newnfs_nmcancelreqs(struct nfsmount *nmp)
+{
+	struct nfsclds *dsp;
+	struct __rpc_client *cl;
+
+	if (nmp->nm_sockreq.nr_client != NULL)
+		CLNT_CLOSE(nmp->nm_sockreq.nr_client);
+lookformore:
+	NFSLOCKMNT(nmp);
+	TAILQ_FOREACH(dsp, &nmp->nm_sess, nfsclds_list) {
+		NFSLOCKDS(dsp);
+		if (dsp != TAILQ_FIRST(&nmp->nm_sess) &&
+		    (dsp->nfsclds_flags & NFSCLDS_CLOSED) == 0 &&
+		    dsp->nfsclds_sockp != NULL &&
+		    dsp->nfsclds_sockp->nr_client != NULL) {
+			dsp->nfsclds_flags |= NFSCLDS_CLOSED;
+			cl = dsp->nfsclds_sockp->nr_client;
+			NFSUNLOCKDS(dsp);
+			NFSUNLOCKMNT(nmp);
+			CLNT_CLOSE(cl);
+			goto lookformore;
+		}
+		NFSUNLOCKDS(dsp);
+	}
+	NFSUNLOCKMNT(nmp);
+	return (0);
+}
+
+/*
+ * Any signal that can interrupt an NFS operation in an intr mount
+ * should be added to this set. SIGSTOP and SIGKILL cannot be masked.
+ */
+int newnfs_sig_set[] = {
+	SIGINT,
+	SIGTERM,
+	SIGHUP,
+	SIGKILL,
+	SIGQUIT
+};
+
+/*
+ * Check to see if one of the signals in our subset is pending on
+ * the process (in an intr mount).
+ */
+static int
+nfs_sig_pending(sigset_t set)
+{
+	int i;
+	
+	for (i = 0 ; i < nitems(newnfs_sig_set); i++)
+		if (SIGISMEMBER(set, newnfs_sig_set[i]))
+			return (1);
+	return (0);
+}
+ 
+/*
+ * The set/restore sigmask functions are used to (temporarily) overwrite
+ * the thread td_sigmask during an RPC call (for example). These are also
+ * used in other places in the NFS client that might tsleep().
+ */
+void
+newnfs_set_sigmask(struct thread *td, sigset_t *oldset)
+{
+	sigset_t newset;
+	int i;
+	struct proc *p;
+	
+	SIGFILLSET(newset);
+	if (td == NULL)
+		td = curthread; /* XXX */
+	p = td->td_proc;
+	/* Remove the NFS set of signals from newset */
+	PROC_LOCK(p);
+	mtx_lock(&p->p_sigacts->ps_mtx);
+	for (i = 0 ; i < nitems(newnfs_sig_set); i++) {
+		/*
+		 * But make sure we leave the ones already masked
+		 * by the process, ie. remove the signal from the
+		 * temporary signalmask only if it wasn't already
+		 * in p_sigmask.
+		 */
+		if (!SIGISMEMBER(td->td_sigmask, newnfs_sig_set[i]) &&
+		    !SIGISMEMBER(p->p_sigacts->ps_sigignore, newnfs_sig_set[i]))
+			SIGDELSET(newset, newnfs_sig_set[i]);
+	}
+	mtx_unlock(&p->p_sigacts->ps_mtx);
+	kern_sigprocmask(td, SIG_SETMASK, &newset, oldset,
+	    SIGPROCMASK_PROC_LOCKED);
+	PROC_UNLOCK(p);
+}
+
+void
+newnfs_restore_sigmask(struct thread *td, sigset_t *set)
+{
+	if (td == NULL)
+		td = curthread; /* XXX */
+	kern_sigprocmask(td, SIG_SETMASK, set, NULL, 0);
+}
+
+/*
+ * NFS wrapper to msleep(), that shoves a new p_sigmask and restores the
+ * old one after msleep() returns.
+ */
+int
+newnfs_msleep(struct thread *td, void *ident, struct mtx *mtx, int priority, char *wmesg, int timo)
+{
+	sigset_t oldset;
+	int error;
+
+	if ((priority & PCATCH) == 0)
+		return msleep(ident, mtx, priority, wmesg, timo);
+	if (td == NULL)
+		td = curthread; /* XXX */
+	newnfs_set_sigmask(td, &oldset);
+	error = msleep(ident, mtx, priority, wmesg, timo);
+	newnfs_restore_sigmask(td, &oldset);
+	return (error);
+}
+
+/*
+ * Test for a termination condition pending on the process.
+ * This is used for NFSMNT_INT mounts.
+ */
+int
+newnfs_sigintr(struct nfsmount *nmp, struct thread *td)
+{
+	struct proc *p;
+	sigset_t tmpset;
+	
+	/* Terminate all requests while attempting a forced unmount. */
+	if (NFSCL_FORCEDISM(nmp->nm_mountp))
+		return (EIO);
+	if (!(nmp->nm_flag & NFSMNT_INT))
+		return (0);
+	if (td == NULL)
+		return (0);
+	p = td->td_proc;
+	PROC_LOCK(p);
+	tmpset = p->p_siglist;
+	SIGSETOR(tmpset, td->td_siglist);
+	SIGSETNAND(tmpset, td->td_sigmask);
+	mtx_lock(&p->p_sigacts->ps_mtx);
+	SIGSETNAND(tmpset, p->p_sigacts->ps_sigignore);
+	mtx_unlock(&p->p_sigacts->ps_mtx);
+	if ((SIGNOTEMPTY(p->p_siglist) || SIGNOTEMPTY(td->td_siglist))
+	    && nfs_sig_pending(tmpset)) {
+		PROC_UNLOCK(p);
+		return (EINTR);
+	}
+	PROC_UNLOCK(p);
+	return (0);
+}
+
+static int
+nfs_msg(struct thread *td, const char *server, const char *msg, int error)
+{
+	struct proc *p;
+
+	p = td ? td->td_proc : NULL;
+	if (error) {
+		tprintf(p, LOG_INFO, "nfs server %s: %s, error %d\n",
+		    server, msg, error);
+	} else {
+		tprintf(p, LOG_INFO, "nfs server %s: %s\n", server, msg);
+	}
+	return (0);
+}
+
+static void
+nfs_down(struct nfsmount *nmp, struct thread *td, const char *msg,
+    int error, int flags)
+{
+	if (nmp == NULL)
+		return;
+	mtx_lock(&nmp->nm_mtx);
+	if ((flags & NFSSTA_TIMEO) && !(nmp->nm_state & NFSSTA_TIMEO)) {
+		nmp->nm_state |= NFSSTA_TIMEO;
+		mtx_unlock(&nmp->nm_mtx);
+		vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
+		    VQ_NOTRESP, 0);
+	} else
+		mtx_unlock(&nmp->nm_mtx);
+	mtx_lock(&nmp->nm_mtx);
+	if ((flags & NFSSTA_LOCKTIMEO) && !(nmp->nm_state & NFSSTA_LOCKTIMEO)) {
+		nmp->nm_state |= NFSSTA_LOCKTIMEO;
+		mtx_unlock(&nmp->nm_mtx);
+		vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
+		    VQ_NOTRESPLOCK, 0);
+	} else
+		mtx_unlock(&nmp->nm_mtx);
+	nfs_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, error);
+}
+
+static void
+nfs_up(struct nfsmount *nmp, struct thread *td, const char *msg,
+    int flags, int tprintfmsg)
+{
+	if (nmp == NULL)
+		return;
+	if (tprintfmsg) {
+		nfs_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, 0);
+	}
+
+	mtx_lock(&nmp->nm_mtx);
+	if ((flags & NFSSTA_TIMEO) && (nmp->nm_state & NFSSTA_TIMEO)) {
+		nmp->nm_state &= ~NFSSTA_TIMEO;
+		mtx_unlock(&nmp->nm_mtx);
+		vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
+		    VQ_NOTRESP, 1);
+	} else
+		mtx_unlock(&nmp->nm_mtx);
+	
+	mtx_lock(&nmp->nm_mtx);
+	if ((flags & NFSSTA_LOCKTIMEO) && (nmp->nm_state & NFSSTA_LOCKTIMEO)) {
+		nmp->nm_state &= ~NFSSTA_LOCKTIMEO;
+		mtx_unlock(&nmp->nm_mtx);
+		vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
+		    VQ_NOTRESPLOCK, 1);
+	} else
+		mtx_unlock(&nmp->nm_mtx);
+}
+