aboutsummaryrefslogtreecommitdiff
path: root/sys/fs/nfsserver/nfs_nfsdkrpc.c
blob: 44f585ff0bebcb4abebbe0231a7a0cb703542b45 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1989, 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. 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("$FreeBSD$");

#include "opt_inet6.h"
#include "opt_kgssapi.h"
#include "opt_kern_tls.h"

#include <fs/nfs/nfsport.h>

#include <rpc/rpc.h>
#include <rpc/rpcsec_gss.h>
#include <rpc/rpcsec_tls.h>

#include <fs/nfsserver/nfs_fha_new.h>

#include <security/mac/mac_framework.h>

NFSDLOCKMUTEX;
NFSV4ROOTLOCKMUTEX;
struct nfsv4lock nfsd_suspend_lock;
char *nfsrv_zeropnfsdat = NULL;

/*
 * Mapping of old NFS Version 2 RPC numbers to generic numbers.
 */
int newnfs_nfsv3_procid[NFS_V3NPROCS] = {
	NFSPROC_NULL,
	NFSPROC_GETATTR,
	NFSPROC_SETATTR,
	NFSPROC_NOOP,
	NFSPROC_LOOKUP,
	NFSPROC_READLINK,
	NFSPROC_READ,
	NFSPROC_NOOP,
	NFSPROC_WRITE,
	NFSPROC_CREATE,
	NFSPROC_REMOVE,
	NFSPROC_RENAME,
	NFSPROC_LINK,
	NFSPROC_SYMLINK,
	NFSPROC_MKDIR,
	NFSPROC_RMDIR,
	NFSPROC_READDIR,
	NFSPROC_FSSTAT,
	NFSPROC_NOOP,
	NFSPROC_NOOP,
	NFSPROC_NOOP,
	NFSPROC_NOOP,
};

SYSCTL_DECL(_vfs_nfsd);

SVCPOOL		*nfsrvd_pool;

static int	nfs_privport = 0;
SYSCTL_INT(_vfs_nfsd, OID_AUTO, nfs_privport, CTLFLAG_RWTUN,
    &nfs_privport, 0,
    "Only allow clients using a privileged port for NFSv2, 3 and 4");

static int	nfs_minvers = NFS_VER2;
SYSCTL_INT(_vfs_nfsd, OID_AUTO, server_min_nfsvers, CTLFLAG_RWTUN,
    &nfs_minvers, 0, "The lowest version of NFS handled by the server");

static int	nfs_maxvers = NFS_VER4;
SYSCTL_INT(_vfs_nfsd, OID_AUTO, server_max_nfsvers, CTLFLAG_RWTUN,
    &nfs_maxvers, 0, "The highest version of NFS handled by the server");

static int nfs_proc(struct nfsrv_descript *, u_int32_t, SVCXPRT *xprt,
    struct nfsrvcache **);

extern u_long sb_max_adj;
extern int newnfs_numnfsd;
extern struct proc *nfsd_master_proc;
extern time_t nfsdev_time;
extern int nfsrv_writerpc[NFS_NPROCS];
extern volatile int nfsrv_devidcnt;
extern struct nfsv4_opflag nfsv4_opflag[NFSV42_NOPS];

/*
 * NFS server system calls
 */

static void
nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt)
{
	struct nfsrv_descript nd;
	struct nfsrvcache *rp = NULL;
	int cacherep, credflavor;
#ifdef KERN_TLS
	u_int maxlen;
#endif

	memset(&nd, 0, sizeof(nd));
	if (rqst->rq_vers == NFS_VER2) {
		if (rqst->rq_proc > NFSV2PROC_STATFS ||
		    newnfs_nfsv3_procid[rqst->rq_proc] == NFSPROC_NOOP) {
			svcerr_noproc(rqst);
			svc_freereq(rqst);
			goto out;
		}
		nd.nd_procnum = newnfs_nfsv3_procid[rqst->rq_proc];
		nd.nd_flag = ND_NFSV2;
	} else if (rqst->rq_vers == NFS_VER3) {
		if (rqst->rq_proc >= NFS_V3NPROCS) {
			svcerr_noproc(rqst);
			svc_freereq(rqst);
			goto out;
		}
		nd.nd_procnum = rqst->rq_proc;
		nd.nd_flag = ND_NFSV3;
	} else {
		if (rqst->rq_proc != NFSPROC_NULL &&
		    rqst->rq_proc != NFSV4PROC_COMPOUND) {
			svcerr_noproc(rqst);
			svc_freereq(rqst);
			goto out;
		}
		nd.nd_procnum = rqst->rq_proc;
		nd.nd_flag = ND_NFSV4;
	}

	/*
	 * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
	 * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
	 * mounts.
	 */
	nd.nd_mrep = rqst->rq_args;
	rqst->rq_args = NULL;
	newnfs_realign(&nd.nd_mrep, M_WAITOK);
	nd.nd_md = nd.nd_mrep;
	nd.nd_dpos = mtod(nd.nd_md, caddr_t);
	nd.nd_nam = svc_getrpccaller(rqst);
	nd.nd_nam2 = rqst->rq_addr;
	nd.nd_mreq = NULL;
	nd.nd_cred = NULL;

	if (nfs_privport != 0) {
		/* Check if source port is privileged */
		u_short port;
		struct sockaddr *nam = nd.nd_nam;
		struct sockaddr_in *sin;

		sin = (struct sockaddr_in *)nam;
		/*
		 * INET/INET6 - same code:
		 *    sin_port and sin6_port are at same offset
		 */
		port = ntohs(sin->sin_port);
		if (port >= IPPORT_RESERVED &&
		    nd.nd_procnum != NFSPROC_NULL) {
#ifdef INET6
			char buf[INET6_ADDRSTRLEN];
#else
			char buf[INET_ADDRSTRLEN];
#endif
#ifdef INET6
#if defined(KLD_MODULE)
			/* Do not use ip6_sprintf: the nfs module should work without INET6. */
#define	ip6_sprintf(buf, a)						\
			(sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x",	\
			    (a)->s6_addr16[0], (a)->s6_addr16[1],	\
			    (a)->s6_addr16[2], (a)->s6_addr16[3],	\
			    (a)->s6_addr16[4], (a)->s6_addr16[5],	\
			    (a)->s6_addr16[6], (a)->s6_addr16[7]),	\
			    (buf))
#endif
#endif
			printf("NFS request from unprivileged port (%s:%d)\n",
#ifdef INET6
			    sin->sin_family == AF_INET6 ?
			    ip6_sprintf(buf, &satosin6(sin)->sin6_addr) :
#if defined(KLD_MODULE)
#undef ip6_sprintf
#endif
#endif
			    inet_ntoa_r(sin->sin_addr, buf), port);
			svcerr_weakauth(rqst);
			svc_freereq(rqst);
			m_freem(nd.nd_mrep);
			goto out;
		}
	}

	if (nd.nd_procnum != NFSPROC_NULL) {
		if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
			svcerr_weakauth(rqst);
			svc_freereq(rqst);
			m_freem(nd.nd_mrep);
			goto out;
		}

		/* Set the flag based on credflavor */
		if (credflavor == RPCSEC_GSS_KRB5) {
			nd.nd_flag |= ND_GSS;
		} else if (credflavor == RPCSEC_GSS_KRB5I) {
			nd.nd_flag |= (ND_GSS | ND_GSSINTEGRITY);
		} else if (credflavor == RPCSEC_GSS_KRB5P) {
			nd.nd_flag |= (ND_GSS | ND_GSSPRIVACY);
		} else if (credflavor != AUTH_SYS) {
			svcerr_weakauth(rqst);
			svc_freereq(rqst);
			m_freem(nd.nd_mrep);
			goto out;
		}

		if ((xprt->xp_tls & RPCTLS_FLAGS_HANDSHAKE) != 0) {
			nd.nd_flag |= ND_TLS;
			if ((xprt->xp_tls & RPCTLS_FLAGS_VERIFIED) != 0)
				nd.nd_flag |= ND_TLSCERT;
			if ((xprt->xp_tls & RPCTLS_FLAGS_CERTUSER) != 0)
				nd.nd_flag |= ND_TLSCERTUSER;
		}
		nd.nd_maxextsiz = 16384;
#ifdef MAC
		mac_cred_associate_nfsd(nd.nd_cred);
#endif
		/*
		 * Get a refcnt (shared lock) on nfsd_suspend_lock.
		 * NFSSVC_SUSPENDNFSD will take an exclusive lock on
		 * nfsd_suspend_lock to suspend these threads.
		 * The call to nfsv4_lock() that precedes nfsv4_getref()
		 * ensures that the acquisition of the exclusive lock
		 * takes priority over acquisition of the shared lock by
		 * waiting for any exclusive lock request to complete.
		 * This must be done here, before the check of
		 * nfsv4root exports by nfsvno_v4rootexport().
		 */
		NFSLOCKV4ROOTMUTEX();
		nfsv4_lock(&nfsd_suspend_lock, 0, NULL, NFSV4ROOTLOCKMUTEXPTR,
		    NULL);
		nfsv4_getref(&nfsd_suspend_lock, NULL, NFSV4ROOTLOCKMUTEXPTR,
		    NULL);
		NFSUNLOCKV4ROOTMUTEX();

		if ((nd.nd_flag & ND_NFSV4) != 0) {
			nd.nd_repstat = nfsvno_v4rootexport(&nd);
			if (nd.nd_repstat != 0) {
				NFSLOCKV4ROOTMUTEX();
				nfsv4_relref(&nfsd_suspend_lock);
				NFSUNLOCKV4ROOTMUTEX();
				svcerr_weakauth(rqst);
				svc_freereq(rqst);
				m_freem(nd.nd_mrep);
				goto out;
			}
		}

#ifdef KERN_TLS
		if ((xprt->xp_tls & RPCTLS_FLAGS_HANDSHAKE) != 0 &&
		    rpctls_getinfo(&maxlen, false, false))
			nd.nd_maxextsiz = maxlen;
#endif
		cacherep = nfs_proc(&nd, rqst->rq_xid, xprt, &rp);
		NFSLOCKV4ROOTMUTEX();
		nfsv4_relref(&nfsd_suspend_lock);
		NFSUNLOCKV4ROOTMUTEX();
	} else {
		NFSMGET(nd.nd_mreq);
		nd.nd_mreq->m_len = 0;
		cacherep = RC_REPLY;
	}
	if (nd.nd_mrep != NULL)
		m_freem(nd.nd_mrep);

	if (nd.nd_cred != NULL)
		crfree(nd.nd_cred);

	if (cacherep == RC_DROPIT) {
		if (nd.nd_mreq != NULL)
			m_freem(nd.nd_mreq);
		svc_freereq(rqst);
		goto out;
	}

	if (nd.nd_mreq == NULL) {
		svcerr_decode(rqst);
		svc_freereq(rqst);
		goto out;
	}

	if (nd.nd_repstat & NFSERR_AUTHERR) {
		svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
		if (nd.nd_mreq != NULL)
			m_freem(nd.nd_mreq);
	} else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) {
		svcerr_systemerr(rqst);
	}
	if (rp != NULL) {
		nfsrvd_sentcache(rp, (rqst->rq_reply_seq != 0 ||
		    SVC_ACK(xprt, NULL)), rqst->rq_reply_seq);
	}
	svc_freereq(rqst);

out:
	td_softdep_cleanup(curthread);
	NFSEXITCODE(0);
}

/*
 * Check the cache and, optionally, do the RPC.
 * Return the appropriate cache response.
 */
static int
nfs_proc(struct nfsrv_descript *nd, u_int32_t xid, SVCXPRT *xprt,
    struct nfsrvcache **rpp)
{
	int cacherep = RC_DOIT, isdgram, taglen = -1;
	struct mbuf *m;
	u_char tag[NFSV4_SMALLSTR + 1], *tagstr = NULL;
	u_int32_t minorvers = 0;
	uint32_t ack;

	*rpp = NULL;
	if (nd->nd_nam2 == NULL) {
		nd->nd_flag |= ND_STREAMSOCK;
		isdgram = 0;
	} else {
		isdgram = 1;
	}

	/*
	 * Two cases:
	 * 1 - For NFSv2 over UDP, if we are near our malloc/mget
	 *     limit, just drop the request. There is no
	 *     NFSERR_RESOURCE or NFSERR_DELAY for NFSv2 and the
	 *     client will timeout/retry over UDP in a little while.
	 * 2 - nd_repstat == 0 && nd_mreq == NULL, which
	 *     means a normal nfs rpc, so check the cache
	 */
	if ((nd->nd_flag & ND_NFSV2) && nd->nd_nam2 != NULL &&
	    nfsrv_mallocmget_limit()) {
		cacherep = RC_DROPIT;
	} else {
		/*
		 * For NFSv3, play it safe and assume that the client is
		 * doing retries on the same TCP connection.
		 */
		if ((nd->nd_flag & (ND_NFSV4 | ND_STREAMSOCK)) ==
		    ND_STREAMSOCK)
			nd->nd_flag |= ND_SAMETCPCONN;
		nd->nd_retxid = xid;
		nd->nd_tcpconntime = NFSD_MONOSEC;
		nd->nd_sockref = xprt->xp_sockref;
		if ((nd->nd_flag & ND_NFSV4) != 0)
			nfsd_getminorvers(nd, tag, &tagstr, &taglen,
			    &minorvers);
		if ((nd->nd_flag & ND_NFSV41) != 0)
			/* NFSv4.1 caches replies in the session slots. */
			cacherep = RC_DOIT;
		else {
			cacherep = nfsrvd_getcache(nd);
			ack = 0;
			SVC_ACK(xprt, &ack);
			nfsrc_trimcache(xprt->xp_sockref, ack, 0);
		}
	}

	/*
	 * Handle the request. There are three cases.
	 * RC_DOIT - do the RPC
	 * RC_REPLY - return the reply already created
	 * RC_DROPIT - just throw the request away
	 */
	if (cacherep == RC_DOIT) {
		if ((nd->nd_flag & ND_NFSV41) != 0)
			nd->nd_xprt = xprt;
		nfsrvd_dorpc(nd, isdgram, tagstr, taglen, minorvers);
		if ((nd->nd_flag & ND_NFSV41) != 0) {
			if (nd->nd_repstat != NFSERR_REPLYFROMCACHE &&
			    (nd->nd_flag & ND_SAVEREPLY) != 0) {
				/* Cache a copy of the reply. */
				m = m_copym(nd->nd_mreq, 0, M_COPYALL,
				    M_WAITOK);
			} else
				m = NULL;
			if ((nd->nd_flag & ND_HASSEQUENCE) != 0)
				nfsrv_cache_session(nd, &m);
			if (nd->nd_repstat == NFSERR_REPLYFROMCACHE) {
				nd->nd_repstat = 0;
				if (m != NULL) {
					m_freem(nd->nd_mreq);
					nd->nd_mreq = m;
				}
			}
			cacherep = RC_REPLY;
		} else {
			if (nd->nd_repstat == NFSERR_DONTREPLY)
				cacherep = RC_DROPIT;
			else
				cacherep = RC_REPLY;
			*rpp = nfsrvd_updatecache(nd);
		}
	}
	if (tagstr != NULL && taglen > NFSV4_SMALLSTR)
		free(tagstr, M_TEMP);

	NFSEXITCODE2(0, nd);
	return (cacherep);
}

static void
nfssvc_loss(SVCXPRT *xprt)
{
	uint32_t ack;

	ack = 0;
	SVC_ACK(xprt, &ack);
	nfsrc_trimcache(xprt->xp_sockref, ack, 1);
}

/*
 * Adds a socket to the list for servicing by nfsds.
 */
int
nfsrvd_addsock(struct file *fp)
{
	int siz;
	struct socket *so;
	int error = 0;
	SVCXPRT *xprt;
	static u_int64_t sockref = 0;

	so = fp->f_data;

	siz = sb_max_adj;
	error = soreserve(so, siz, siz);
	if (error)
		goto out;

	/*
	 * Steal the socket from userland so that it doesn't close
	 * unexpectedly.
	 */
	if (so->so_type == SOCK_DGRAM)
		xprt = svc_dg_create(nfsrvd_pool, so, 0, 0);
	else
		xprt = svc_vc_create(nfsrvd_pool, so, 0, 0);
	if (xprt) {
		fp->f_ops = &badfileops;
		fp->f_data = NULL;
		xprt->xp_sockref = ++sockref;
		if (nfs_minvers == NFS_VER2)
			svc_reg(xprt, NFS_PROG, NFS_VER2, nfssvc_program,
			    NULL);
		if (nfs_minvers <= NFS_VER3 && nfs_maxvers >= NFS_VER3)
			svc_reg(xprt, NFS_PROG, NFS_VER3, nfssvc_program,
			    NULL);
		if (nfs_maxvers >= NFS_VER4)
			svc_reg(xprt, NFS_PROG, NFS_VER4, nfssvc_program,
			    NULL);
		if (so->so_type == SOCK_STREAM)
			svc_loss_reg(xprt, nfssvc_loss);
		SVC_RELEASE(xprt);
	}

out:
	NFSEXITCODE(error);
	return (error);
}

/*
 * Called by nfssvc() for nfsds. Just loops around servicing rpc requests
 * until it is killed by a signal.
 */
int
nfsrvd_nfsd(struct thread *td, struct nfsd_nfsd_args *args)
{
	char principal[MAXHOSTNAMELEN + 5];
	struct proc *p;
	int error = 0;
	bool_t ret2, ret3, ret4;

	error = copyinstr(args->principal, principal, sizeof (principal),
	    NULL);
	if (error)
		goto out;

	/*
	 * Only the first nfsd actually does any work. The RPC code
	 * adds threads to it as needed. Any extra processes offered
	 * by nfsd just exit. If nfsd is new enough, it will call us
	 * once with a structure that specifies how many threads to
	 * use.
	 */
	NFSD_LOCK();
	if (newnfs_numnfsd == 0) {
		nfsdev_time = time_second;
		p = td->td_proc;
		PROC_LOCK(p);
		p->p_flag2 |= P2_AST_SU;
		PROC_UNLOCK(p);
		newnfs_numnfsd++;

		NFSD_UNLOCK();
		error = nfsrv_createdevids(args, td);
		if (error == 0) {
			/* An empty string implies AUTH_SYS only. */
			if (principal[0] != '\0') {
				ret2 = rpc_gss_set_svc_name_call(principal,
				    "kerberosv5", GSS_C_INDEFINITE, NFS_PROG,
				    NFS_VER2);
				ret3 = rpc_gss_set_svc_name_call(principal,
				    "kerberosv5", GSS_C_INDEFINITE, NFS_PROG,
				    NFS_VER3);
				ret4 = rpc_gss_set_svc_name_call(principal,
				    "kerberosv5", GSS_C_INDEFINITE, NFS_PROG,
				    NFS_VER4);

				if (!ret2 || !ret3 || !ret4)
					printf(
					    "nfsd: can't register svc name\n");
			}

			nfsrvd_pool->sp_minthreads = args->minthreads;
			nfsrvd_pool->sp_maxthreads = args->maxthreads;
				
			/*
			 * If this is a pNFS service, make Getattr do a
			 * vn_start_write(), so it can do a vn_set_extattr().
			 */
			if (nfsrv_devidcnt > 0) {
				nfsrv_writerpc[NFSPROC_GETATTR] = 1;
				nfsv4_opflag[NFSV4OP_GETATTR].modifyfs = 1;
			}

			svc_run(nfsrvd_pool);

			/* Reset Getattr to not do a vn_start_write(). */
			nfsrv_writerpc[NFSPROC_GETATTR] = 0;
			nfsv4_opflag[NFSV4OP_GETATTR].modifyfs = 0;

			if (principal[0] != '\0') {
				rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER2);
				rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER3);
				rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER4);
			}
		}
		NFSD_LOCK();
		newnfs_numnfsd--;
		nfsrvd_init(1);
		PROC_LOCK(p);
		p->p_flag2 &= ~P2_AST_SU;
		PROC_UNLOCK(p);
	}
	NFSD_UNLOCK();

out:
	NFSEXITCODE(error);
	return (error);
}

/*
 * Initialize the data structures for the server.
 * Handshake with any new nfsds starting up to avoid any chance of
 * corruption.
 */
void
nfsrvd_init(int terminating)
{

	NFSD_LOCK_ASSERT();

	if (terminating) {
		nfsd_master_proc = NULL;
		NFSD_UNLOCK();
		nfsrv_freealllayoutsanddevids();
		nfsrv_freeallbackchannel_xprts();
		svcpool_close(nfsrvd_pool);
		free(nfsrv_zeropnfsdat, M_TEMP);
		nfsrv_zeropnfsdat = NULL;
		NFSD_LOCK();
	} else {
		NFSD_UNLOCK();
		nfsrvd_pool = svcpool_create("nfsd",
		    SYSCTL_STATIC_CHILDREN(_vfs_nfsd));
		nfsrvd_pool->sp_rcache = NULL;
		nfsrvd_pool->sp_assign = fhanew_assign;
		nfsrvd_pool->sp_done = fhanew_nd_complete;
		NFSD_LOCK();
	}
}