proc->thread stage 4: rework the VFS and DEVICE subsystems to take thread
[dragonfly.git] / sys / vfs / nfs / nfs_nqlease.c
CommitLineData
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1/*
2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)nfs_nqlease.c 8.9 (Berkeley) 5/20/95
37 * $FreeBSD: src/sys/nfs/nfs_nqlease.c,v 1.50 2000/02/13 03:32:05 peter Exp $
dadab5e9 38 * $DragonFly: src/sys/vfs/nfs/Attic/nfs_nqlease.c,v 1.3 2003/06/25 03:56:07 dillon Exp $
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39 */
40
41
42/*
43 * References:
44 * Cary G. Gray and David R. Cheriton, "Leases: An Efficient Fault-Tolerant
45 * Mechanism for Distributed File Cache Consistency",
46 * In Proc. of the Twelfth ACM Symposium on Operating Systems
47 * Principals, pg. 202-210, Litchfield Park, AZ, Dec. 1989.
48 * Michael N. Nelson, Brent B. Welch and John K. Ousterhout, "Caching
49 * in the Sprite Network File System", ACM TOCS 6(1),
50 * pages 134-154, February 1988.
51 * V. Srinivasan and Jeffrey C. Mogul, "Spritely NFS: Implementation and
52 * Performance of Cache-Consistency Protocols", Digital
53 * Equipment Corporation WRL Research Report 89/5, May 1989.
54 */
55#include <sys/param.h>
56#include <sys/vnode.h>
57#include <sys/malloc.h>
58#include <sys/mount.h>
59#include <sys/kernel.h>
60#include <sys/proc.h>
61#include <sys/systm.h>
62#include <sys/mbuf.h>
63#include <sys/socket.h>
64#include <sys/socketvar.h>
65#include <sys/protosw.h>
66
67#include <vm/vm_zone.h>
68
69#include <netinet/in.h>
70#include <nfs/rpcv2.h>
71#include <nfs/nfsproto.h>
72#include <nfs/nfs.h>
73#include <nfs/nfsm_subs.h>
74#include <nfs/xdr_subs.h>
75#include <nfs/nqnfs.h>
76#include <nfs/nfsnode.h>
77#include <nfs/nfsmount.h>
78
79static MALLOC_DEFINE(M_NQMHOST, "NQNFS Host", "Nqnfs host address table");
80
81time_t nqnfsstarttime = (time_t)0;
82int nqsrv_clockskew = NQ_CLOCKSKEW;
83int nqsrv_writeslack = NQ_WRITESLACK;
84int nqsrv_maxlease = NQ_MAXLEASE;
85#ifndef NFS_NOSERVER
86static int nqsrv_maxnumlease = NQ_MAXNUMLEASE;
87#endif
88
89struct vop_lease_args;
90
91#ifndef NFS_NOSERVER
92static int nqsrv_cmpnam __P((struct nfssvc_sock *, struct sockaddr *,
93 struct nqhost *));
94static int nqnfs_vacated __P((struct vnode *vp, struct ucred *cred));
95static void nqsrv_addhost __P((struct nqhost *lph, struct nfssvc_sock *slp,
96 struct sockaddr *nam));
97static void nqsrv_instimeq __P((struct nqlease *lp, u_int32_t duration));
98static void nqsrv_locklease __P((struct nqlease *lp));
99static void nqsrv_send_eviction __P((struct vnode *vp, struct nqlease *lp,
100 struct nfssvc_sock *slp,
101 struct sockaddr *nam,
102 struct ucred *cred));
103static void nqsrv_unlocklease __P((struct nqlease *lp));
104static void nqsrv_waitfor_expiry __P((struct nqlease *lp));
105#endif
106extern void nqnfs_lease_updatetime __P((int deltat));
107
108/*
109 * Signifies which rpcs can have piggybacked lease requests
110 */
111int nqnfs_piggy[NFS_NPROCS] = {
112 0,
113 0,
114 ND_WRITE,
115 ND_READ,
116 0,
117 ND_READ,
118 ND_READ,
119 ND_WRITE,
120 0,
121 0,
122 0,
123 0,
124 0,
125 0,
126 0,
127 0,
128 ND_READ,
129 ND_READ,
130 0,
131 0,
132 0,
133 0,
134 0,
135 0,
136 0,
137 0,
138};
139
140extern nfstype nfsv2_type[9];
141extern nfstype nfsv3_type[9];
142extern int nfsd_waiting;
143extern struct nfsstats nfsstats;
144
145#define TRUE 1
146#define FALSE 0
147
148#ifndef NFS_NOSERVER
149/*
150 * Get or check for a lease for "vp", based on ND_CHECK flag.
151 * The rules are as follows:
152 * - if a current non-caching lease, reply non-caching
153 * - if a current lease for same host only, extend lease
154 * - if a read cachable lease and a read lease request
155 * add host to list any reply cachable
156 * - else { set non-cachable for read-write sharing }
157 * send eviction notice messages to all other hosts that have lease
158 * wait for lease termination { either by receiving vacated messages
159 * from all the other hosts or expiry
160 * via. timeout }
161 * modify lease to non-cachable
162 * - else if no current lease, issue new one
163 * - reply
164 * - return boolean TRUE iff nam should be m_freem()'d
165 * NB: Since nqnfs_serverd() is called from a timer, any potential tsleep()
166 * in here must be framed by nqsrv_locklease() and nqsrv_unlocklease().
167 * nqsrv_locklease() is coded such that at least one of LC_LOCKED and
168 * LC_WANTED is set whenever a process is tsleeping in it. The exception
169 * is when a new lease is being allocated, since it is not in the timer
170 * queue yet. (Ditto for the splsoftclock() and splx(s) calls)
171 */
172int
dadab5e9 173nqsrv_getlease(vp, duration, flags, slp, td, nam, cachablep, frev, cred)
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174 struct vnode *vp;
175 u_int32_t *duration;
176 int flags;
177 struct nfssvc_sock *slp;
dadab5e9 178 struct thread *td;
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179 struct sockaddr *nam;
180 int *cachablep;
181 u_quad_t *frev;
182 struct ucred *cred;
183{
184 register struct nqlease *lp;
185 register struct nqfhhashhead *lpp = NULL;
186 register struct nqhost *lph = NULL;
187 struct nqlease *tlp;
188 struct nqm **lphp;
189 struct vattr vattr;
190 fhandle_t fh;
191 int i, ok, error, s;
192
193 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
194 return (0);
195 if (*duration > nqsrv_maxlease)
196 *duration = nqsrv_maxlease;
dadab5e9 197 error = VOP_GETATTR(vp, &vattr, cred, td);
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198 if (error)
199 return (error);
200 *frev = vattr.va_filerev;
201 s = splsoftclock();
202 tlp = vp->v_lease;
203 if ((flags & ND_CHECK) == 0)
204 nfsstats.srvnqnfs_getleases++;
205 if (tlp == 0) {
206 /*
207 * Find the lease by searching the hash list.
208 */
209 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
210 error = VFS_VPTOFH(vp, &fh.fh_fid);
211 if (error) {
212 splx(s);
213 return (error);
214 }
215 lpp = NQFHHASH(fh.fh_fid.fid_data);
216 for (lp = lpp->lh_first; lp != 0; lp = lp->lc_hash.le_next)
217 if (fh.fh_fsid.val[0] == lp->lc_fsid.val[0] &&
218 fh.fh_fsid.val[1] == lp->lc_fsid.val[1] &&
219 !bcmp(fh.fh_fid.fid_data, lp->lc_fiddata,
220 fh.fh_fid.fid_len - sizeof (int32_t))) {
221 /* Found it */
222 lp->lc_vp = vp;
223 vp->v_lease = lp;
224 tlp = lp;
225 break;
226 }
227 } else
228 lp = tlp;
229 if (lp != 0) {
230 if ((lp->lc_flag & LC_NONCACHABLE) ||
231 (lp->lc_morehosts == (struct nqm *)0 &&
232 nqsrv_cmpnam(slp, nam, &lp->lc_host)))
233 goto doreply;
234 if ((flags & ND_READ) && (lp->lc_flag & LC_WRITE) == 0) {
235 if (flags & ND_CHECK)
236 goto doreply;
237 if (nqsrv_cmpnam(slp, nam, &lp->lc_host))
238 goto doreply;
239 i = 0;
240 if (lp->lc_morehosts) {
241 lph = lp->lc_morehosts->lpm_hosts;
242 lphp = &lp->lc_morehosts->lpm_next;
243 ok = 1;
244 } else {
245 lphp = &lp->lc_morehosts;
246 ok = 0;
247 }
248 while (ok && (lph->lph_flag & LC_VALID)) {
249 if (nqsrv_cmpnam(slp, nam, lph))
250 goto doreply;
251 if (++i == LC_MOREHOSTSIZ) {
252 i = 0;
253 if (*lphp) {
254 lph = (*lphp)->lpm_hosts;
255 lphp = &((*lphp)->lpm_next);
256 } else
257 ok = 0;
258 } else
259 lph++;
260 }
261 nqsrv_locklease(lp);
262 if (!ok) {
263 *lphp = (struct nqm *)
264 malloc(sizeof (struct nqm),
265 M_NQMHOST, M_WAITOK);
266 bzero((caddr_t)*lphp, sizeof (struct nqm));
267 lph = (*lphp)->lpm_hosts;
268 }
269 nqsrv_addhost(lph, slp, nam);
270 nqsrv_unlocklease(lp);
271 } else {
272 lp->lc_flag |= LC_NONCACHABLE;
273 nqsrv_locklease(lp);
274 nqsrv_send_eviction(vp, lp, slp, nam, cred);
275 nqsrv_waitfor_expiry(lp);
276 nqsrv_unlocklease(lp);
277 }
278doreply:
279 /*
280 * Update the lease and return
281 */
282 if ((flags & ND_CHECK) == 0)
283 nqsrv_instimeq(lp, *duration);
284 if (lp->lc_flag & LC_NONCACHABLE)
285 *cachablep = 0;
286 else {
287 *cachablep = 1;
288 if (flags & ND_WRITE)
289 lp->lc_flag |= LC_WRITTEN;
290 }
291 splx(s);
292 return (0);
293 }
294 splx(s);
295 if (flags & ND_CHECK)
296 return (0);
297
298 /*
299 * Allocate new lease
300 * The value of nqsrv_maxnumlease should be set generously, so that
301 * the following "printf" happens infrequently.
302 */
303 if (nfsstats.srvnqnfs_leases > nqsrv_maxnumlease) {
304 printf("Nqnfs server, too many leases\n");
305 do {
306 (void) tsleep((caddr_t)&lbolt, PSOCK,
307 "nqsrvnuml", 0);
308 } while (nfsstats.srvnqnfs_leases > nqsrv_maxnumlease);
309 }
310 MALLOC(lp, struct nqlease *, sizeof (struct nqlease), M_NQLEASE, M_WAITOK);
311 bzero((caddr_t)lp, sizeof (struct nqlease));
312 if (flags & ND_WRITE)
313 lp->lc_flag |= (LC_WRITE | LC_WRITTEN);
314 nqsrv_addhost(&lp->lc_host, slp, nam);
315 lp->lc_vp = vp;
316 lp->lc_fsid = fh.fh_fsid;
317 bcopy(fh.fh_fid.fid_data, lp->lc_fiddata,
318 fh.fh_fid.fid_len - sizeof (int32_t));
319 if(!lpp)
320 panic("nfs_nqlease.c: Phoney lpp");
321 LIST_INSERT_HEAD(lpp, lp, lc_hash);
322 vp->v_lease = lp;
323 s = splsoftclock();
324 nqsrv_instimeq(lp, *duration);
325 splx(s);
326 *cachablep = 1;
327 if (++nfsstats.srvnqnfs_leases > nfsstats.srvnqnfs_maxleases)
328 nfsstats.srvnqnfs_maxleases = nfsstats.srvnqnfs_leases;
329 return (0);
330}
331
332/*
333 * Local lease check for server syscalls.
334 * Just set up args and let nqsrv_getlease() do the rest.
335 * nqnfs_vop_lease_check() is the VOP_LEASE() form of the same routine.
336 * Ifdef'd code in nfsnode.h renames these routines to whatever a particular
337 * OS needs.
338 */
339void
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340nqnfs_lease_check(struct vnode *vp, struct thread *td,
341 struct ucred *cred, int flag)
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342{
343 u_int32_t duration = 0;
344 int cache;
345 u_quad_t frev;
346
347 (void) nqsrv_getlease(vp, &duration, ND_CHECK | flag, NQLOCALSLP,
dadab5e9 348 td, (struct sockaddr *)0, &cache, &frev, cred);
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349}
350
351int
352nqnfs_vop_lease_check(ap)
353 struct vop_lease_args /* {
354 struct vnode *a_vp;
dadab5e9 355 struct thread *a_td;
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356 struct ucred *a_cred;
357 int a_flag;
358 } */ *ap;
359{
360 u_int32_t duration = 0;
361 int cache;
362 u_quad_t frev;
363
364 (void) nqsrv_getlease(ap->a_vp, &duration, ND_CHECK | ap->a_flag,
dadab5e9 365 NQLOCALSLP, ap->a_td, (struct sockaddr *)0,
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366 &cache, &frev, ap->a_cred);
367 return (0);
368}
369
370
371/*
372 * Add a host to an nqhost structure for a lease.
373 */
374static void
375nqsrv_addhost(lph, slp, nam)
376 register struct nqhost *lph;
377 struct nfssvc_sock *slp;
378 struct sockaddr *nam;
379{
380 struct sockaddr_in *saddr;
381 struct socket *nsso;
382
383 if (slp == NQLOCALSLP) {
384 lph->lph_flag |= (LC_VALID | LC_LOCAL);
385 return;
386 }
387 nsso = slp->ns_so;
388 lph->lph_slp = slp;
389 if (nsso && nsso->so_proto->pr_protocol == IPPROTO_UDP) {
390 saddr = (struct sockaddr_in *)nam;
391 lph->lph_flag |= (LC_VALID | LC_UDP);
392 lph->lph_inetaddr = saddr->sin_addr.s_addr;
393 lph->lph_port = saddr->sin_port;
394 } else {
395 lph->lph_flag |= (LC_VALID | LC_SREF);
396 slp->ns_sref++;
397 }
398}
399
400/*
401 * Update the lease expiry time and position it in the timer queue correctly.
402 */
403static void
404nqsrv_instimeq(lp, duration)
405 register struct nqlease *lp;
406 u_int32_t duration;
407{
408 register struct nqlease *tlp;
409 time_t newexpiry;
410
411 newexpiry = time_second + duration + nqsrv_clockskew;
412 if (lp->lc_expiry == newexpiry)
413 return;
414 if (lp->lc_timer.cqe_next != 0) {
415 CIRCLEQ_REMOVE(&nqtimerhead, lp, lc_timer);
416 }
417 lp->lc_expiry = newexpiry;
418
419 /*
420 * Find where in the queue it should be.
421 */
422 tlp = nqtimerhead.cqh_last;
423 while (tlp != (void *)&nqtimerhead && tlp->lc_expiry > newexpiry)
424 tlp = tlp->lc_timer.cqe_prev;
425#ifdef HASNVRAM
426 if (tlp == nqtimerhead.cqh_last)
427 NQSTORENOVRAM(newexpiry);
428#endif /* HASNVRAM */
429 if (tlp == (void *)&nqtimerhead) {
430 CIRCLEQ_INSERT_HEAD(&nqtimerhead, lp, lc_timer);
431 } else {
432 CIRCLEQ_INSERT_AFTER(&nqtimerhead, tlp, lp, lc_timer);
433 }
434}
435
436/*
437 * Compare the requesting host address with the lph entry in the lease.
438 * Return true iff it is the same.
439 * This is somewhat messy due to the union in the nqhost structure.
440 * The local host is indicated by the special value of NQLOCALSLP for slp.
441 */
442static int
443nqsrv_cmpnam(slp, nam, lph)
444 register struct nfssvc_sock *slp;
445 struct sockaddr *nam;
446 register struct nqhost *lph;
447{
448 register struct sockaddr_in *saddr;
449 struct sockaddr *addr;
450 union nethostaddr lhaddr;
451 struct socket *nsso;
452 int ret;
453
454 if (slp == NQLOCALSLP) {
455 if (lph->lph_flag & LC_LOCAL)
456 return (1);
457 else
458 return (0);
459 }
460 nsso = slp->ns_so;
461 if (nsso && nsso->so_proto->pr_protocol == IPPROTO_UDP) {
462 addr = nam;
463 } else {
464 addr = slp->ns_nam;
465 }
466 if (lph->lph_flag & LC_UDP) {
467 ret = netaddr_match(AF_INET, &lph->lph_haddr, addr);
468 } else {
469 if ((lph->lph_slp->ns_flag & SLP_VALID) == 0)
470 return (0);
471 saddr = (struct sockaddr_in *)lph->lph_slp->ns_nam;
472 if (saddr->sin_family == AF_INET)
473 lhaddr.had_inetaddr = saddr->sin_addr.s_addr;
474 else
475 lhaddr.had_nam = lph->lph_slp->ns_nam;
476 ret = netaddr_match(saddr->sin_family, &lhaddr, addr);
477 }
478 return (ret);
479}
480
481/*
482 * Send out eviction notice messages to all other hosts for the lease.
483 */
484static void
485nqsrv_send_eviction(vp, lp, slp, nam, cred)
486 struct vnode *vp;
487 register struct nqlease *lp;
488 struct nfssvc_sock *slp;
489 struct sockaddr *nam;
490 struct ucred *cred;
491{
492 register struct nqhost *lph = &lp->lc_host;
493 register int siz;
494 struct nqm *lphnext = lp->lc_morehosts;
495 struct mbuf *m, *mreq, *mb, *mb2, *mheadend;
496 struct sockaddr *nam2;
497 struct sockaddr_in *saddr;
498 nfsfh_t nfh;
499 fhandle_t *fhp;
500 caddr_t bpos, cp;
501 u_int32_t xid, *tl;
502 int len = 1, ok = 1, i = 0;
503
504 while (ok && (lph->lph_flag & LC_VALID)) {
505 if (nqsrv_cmpnam(slp, nam, lph)) {
506 lph->lph_flag |= LC_VACATED;
507 } else if ((lph->lph_flag & (LC_LOCAL | LC_VACATED)) == 0) {
508 struct socket *so;
509 int sotype;
510 int *solockp = NULL;
511
512 so = lph->lph_slp->ns_so;
513 if (lph->lph_flag & LC_UDP) {
514 MALLOC(nam2, struct sockaddr *,
515 sizeof *nam2, M_SONAME, M_WAITOK);
516 saddr = (struct sockaddr_in *)nam2;
517 saddr->sin_len = sizeof *saddr;
518 saddr->sin_family = AF_INET;
519 saddr->sin_addr.s_addr = lph->lph_inetaddr;
520 saddr->sin_port = lph->lph_port;
521 } else if (lph->lph_slp->ns_flag & SLP_VALID) {
522 nam2 = (struct sockaddr *)0;
523 } else {
524 goto nextone;
525 }
526 sotype = so->so_type;
527 if (so->so_proto->pr_flags & PR_CONNREQUIRED)
528 solockp = &lph->lph_slp->ns_solock;
529 nfsm_reqhead((struct vnode *)0, NQNFSPROC_EVICTED,
530 NFSX_V3FH + NFSX_UNSIGNED);
531 fhp = &nfh.fh_generic;
532 bzero((caddr_t)fhp, sizeof(nfh));
533 fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
534 VFS_VPTOFH(vp, &fhp->fh_fid);
535 nfsm_srvfhtom(fhp, 1);
536 m = mreq;
537 siz = 0;
538 while (m) {
539 siz += m->m_len;
540 m = m->m_next;
541 }
542 if (siz <= 0 || siz > NFS_MAXPACKET) {
543 printf("mbuf siz=%d\n",siz);
544 panic("Bad nfs svc reply");
545 }
546 m = nfsm_rpchead(cred, (NFSMNT_NFSV3 | NFSMNT_NQNFS),
547 NQNFSPROC_EVICTED,
548 RPCAUTH_UNIX, 5 * NFSX_UNSIGNED, (char *)0,
549 0, (char *)NULL, mreq, siz, &mheadend, &xid);
550 /*
551 * For stream protocols, prepend a Sun RPC
552 * Record Mark.
553 */
554 if (sotype == SOCK_STREAM) {
555 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT);
556 *mtod(m, u_int32_t *) = htonl(0x80000000 |
557 (m->m_pkthdr.len - NFSX_UNSIGNED));
558 }
559 /*
560 * nfs_sndlock if PR_CONNREQUIRED XXX
561 */
562
563 if ((lph->lph_flag & LC_UDP) == 0 &&
564 ((lph->lph_slp->ns_flag & SLP_VALID) == 0 ||
565 nfs_slplock(lph->lph_slp, 0) == 0)) {
566 m_freem(m);
567 } else {
568 (void) nfs_send(so, nam2, m,
569 (struct nfsreq *)0);
570 if (solockp)
571 nfs_slpunlock(lph->lph_slp);
572 }
573 if (lph->lph_flag & LC_UDP)
574 FREE(nam2, M_SONAME);
575 }
576nextone:
577 if (++i == len) {
578 if (lphnext) {
579 i = 0;
580 len = LC_MOREHOSTSIZ;
581 lph = lphnext->lpm_hosts;
582 lphnext = lphnext->lpm_next;
583 } else
584 ok = 0;
585 } else
586 lph++;
587 }
588}
589
590/*
591 * Wait for the lease to expire.
592 * This will occur when all clients have sent "vacated" messages to
593 * this server OR when it expires do to timeout.
594 */
595static void
596nqsrv_waitfor_expiry(lp)
597 register struct nqlease *lp;
598{
599 register struct nqhost *lph;
600 register int i;
601 struct nqm *lphnext;
602 int len, ok;
603
604tryagain:
605 if (time_second > lp->lc_expiry)
606 return;
607 lph = &lp->lc_host;
608 lphnext = lp->lc_morehosts;
609 len = 1;
610 i = 0;
611 ok = 1;
612 while (ok && (lph->lph_flag & LC_VALID)) {
613 if ((lph->lph_flag & (LC_LOCAL | LC_VACATED)) == 0) {
614 lp->lc_flag |= LC_EXPIREDWANTED;
615 (void) tsleep((caddr_t)&lp->lc_flag, PSOCK,
616 "nqexp", 0);
617 goto tryagain;
618 }
619 if (++i == len) {
620 if (lphnext) {
621 i = 0;
622 len = LC_MOREHOSTSIZ;
623 lph = lphnext->lpm_hosts;
624 lphnext = lphnext->lpm_next;
625 } else
626 ok = 0;
627 } else
628 lph++;
629 }
630}
631
632/*
633 * Nqnfs server timer that maintains the server lease queue.
634 * Scan the lease queue for expired entries:
635 * - when one is found, wakeup anyone waiting for it
636 * else dequeue and free
637 */
638void
639nqnfs_serverd()
640{
641 register struct nqlease *lp;
642 register struct nqhost *lph;
643 struct nqlease *nextlp;
644 struct nqm *lphnext, *olphnext;
645 int i, len, ok;
646
647 for (lp = nqtimerhead.cqh_first; lp != (void *)&nqtimerhead;
648 lp = nextlp) {
649 if (lp->lc_expiry >= time_second)
650 break;
651 nextlp = lp->lc_timer.cqe_next;
652 if (lp->lc_flag & LC_EXPIREDWANTED) {
653 lp->lc_flag &= ~LC_EXPIREDWANTED;
654 wakeup((caddr_t)&lp->lc_flag);
655 } else if ((lp->lc_flag & (LC_LOCKED | LC_WANTED)) == 0) {
656 /*
657 * Make a best effort at keeping a write caching lease long
658 * enough by not deleting it until it has been explicitly
659 * vacated or there have been no writes in the previous
660 * write_slack seconds since expiry and the nfsds are not
661 * all busy. The assumption is that if the nfsds are not
662 * all busy now (no queue of nfs requests), then the client
663 * would have been able to do at least one write to the
664 * file during the last write_slack seconds if it was still
665 * trying to push writes to the server.
666 */
667 if ((lp->lc_flag & (LC_WRITE | LC_VACATED)) == LC_WRITE &&
668 ((lp->lc_flag & LC_WRITTEN) || nfsd_waiting == 0)) {
669 lp->lc_flag &= ~LC_WRITTEN;
670 nqsrv_instimeq(lp, nqsrv_writeslack);
671 } else {
672 CIRCLEQ_REMOVE(&nqtimerhead, lp, lc_timer);
673 LIST_REMOVE(lp, lc_hash);
674 /*
675 * This soft reference may no longer be valid, but
676 * no harm done. The worst case is if the vnode was
677 * recycled and has another valid lease reference,
678 * which is dereferenced prematurely.
679 */
680 lp->lc_vp->v_lease = (struct nqlease *)0;
681 lph = &lp->lc_host;
682 lphnext = lp->lc_morehosts;
683 olphnext = (struct nqm *)0;
684 len = 1;
685 i = 0;
686 ok = 1;
687 while (ok && (lph->lph_flag & LC_VALID)) {
688 if (lph->lph_flag & LC_SREF)
689 nfsrv_slpderef(lph->lph_slp);
690 if (++i == len) {
691 if (olphnext) {
692 free((caddr_t)olphnext, M_NQMHOST);
693 olphnext = (struct nqm *)0;
694 }
695 if (lphnext) {
696 olphnext = lphnext;
697 i = 0;
698 len = LC_MOREHOSTSIZ;
699 lph = lphnext->lpm_hosts;
700 lphnext = lphnext->lpm_next;
701 } else
702 ok = 0;
703 } else
704 lph++;
705 }
706 FREE((caddr_t)lp, M_NQLEASE);
707 if (olphnext)
708 free((caddr_t)olphnext, M_NQMHOST);
709 nfsstats.srvnqnfs_leases--;
710 }
711 }
712 }
713}
714
715/*
716 * Called from nfssvc_nfsd() for a getlease rpc request.
717 * Do the from/to xdr translation and call nqsrv_getlease() to
718 * do the real work.
719 */
720int
dadab5e9
MD
721nqnfsrv_getlease(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
722 struct thread *td, struct mbuf **mrq)
984263bc
MD
723{
724 struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
725 struct sockaddr *nam = nfsd->nd_nam;
726 caddr_t dpos = nfsd->nd_dpos;
727 struct ucred *cred = &nfsd->nd_cr;
728 register struct nfs_fattr *fp;
729 struct vattr va;
730 register struct vattr *vap = &va;
731 struct vnode *vp;
732 nfsfh_t nfh;
733 fhandle_t *fhp;
734 register u_int32_t *tl;
735 register int32_t t1;
736 u_quad_t frev;
737 caddr_t bpos;
738 int error = 0;
739 char *cp2;
740 struct mbuf *mb, *mb2, *mreq;
741 int flags, rdonly, cache;
742
743 fhp = &nfh.fh_generic;
744 nfsm_srvmtofh(fhp);
745 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
746 flags = fxdr_unsigned(int, *tl++);
747 nfsd->nd_duration = fxdr_unsigned(int, *tl);
748 error = nfsrv_fhtovp(fhp, 1, &vp, cred, slp, nam, &rdonly,
749 (nfsd->nd_flag & ND_KERBAUTH), TRUE);
750 if (error) {
751 nfsm_reply(0);
752 goto nfsmout;
753 }
754 if (rdonly && flags == ND_WRITE) {
755 error = EROFS;
756 vput(vp);
757 nfsm_reply(0);
758 }
dadab5e9 759 (void) nqsrv_getlease(vp, &nfsd->nd_duration, flags, slp, td,
984263bc 760 nam, &cache, &frev, cred);
dadab5e9 761 error = VOP_GETATTR(vp, vap, cred, td);
984263bc
MD
762 vput(vp);
763 nfsm_reply(NFSX_V3FATTR + 4 * NFSX_UNSIGNED);
764 nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
765 *tl++ = txdr_unsigned(cache);
766 *tl++ = txdr_unsigned(nfsd->nd_duration);
767 txdr_hyper(frev, tl);
768 nfsm_build(fp, struct nfs_fattr *, NFSX_V3FATTR);
769 nfsm_srvfillattr(vap, fp);
770 nfsm_srvdone;
771}
772
773/*
774 * Called from nfssvc_nfsd() when a "vacated" message is received from a
775 * client. Find the entry and expire it.
776 */
777int
dadab5e9
MD
778nqnfsrv_vacated(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
779 struct thread *td, struct mbuf **mrq)
984263bc
MD
780{
781 struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
782 struct sockaddr *nam = nfsd->nd_nam;
783 caddr_t dpos = nfsd->nd_dpos;
784 register struct nqlease *lp;
785 register struct nqhost *lph;
786 struct nqlease *tlp = (struct nqlease *)0;
787 nfsfh_t nfh;
788 fhandle_t *fhp;
789 register u_int32_t *tl;
790 register int32_t t1;
791 struct nqm *lphnext;
792 struct mbuf *mreq, *mb;
793 int error = 0, i, len, ok, gotit = 0, cache = 0;
794 char *cp2, *bpos;
795 u_quad_t frev;
796
797 fhp = &nfh.fh_generic;
798 nfsm_srvmtofh(fhp);
799 m_freem(mrep);
800 /*
801 * Find the lease by searching the hash list.
802 */
803 for (lp = NQFHHASH(fhp->fh_fid.fid_data)->lh_first; lp != 0;
804 lp = lp->lc_hash.le_next)
805 if (fhp->fh_fsid.val[0] == lp->lc_fsid.val[0] &&
806 fhp->fh_fsid.val[1] == lp->lc_fsid.val[1] &&
807 !bcmp(fhp->fh_fid.fid_data, lp->lc_fiddata,
808 MAXFIDSZ)) {
809 /* Found it */
810 tlp = lp;
811 break;
812 }
813 if (tlp != 0) {
814 lp = tlp;
815 len = 1;
816 i = 0;
817 lph = &lp->lc_host;
818 lphnext = lp->lc_morehosts;
819 ok = 1;
820 while (ok && (lph->lph_flag & LC_VALID)) {
821 if (nqsrv_cmpnam(slp, nam, lph)) {
822 lph->lph_flag |= LC_VACATED;
823 gotit++;
824 break;
825 }
826 if (++i == len) {
827 if (lphnext) {
828 len = LC_MOREHOSTSIZ;
829 i = 0;
830 lph = lphnext->lpm_hosts;
831 lphnext = lphnext->lpm_next;
832 } else
833 ok = 0;
834 } else
835 lph++;
836 }
837 if ((lp->lc_flag & LC_EXPIREDWANTED) && gotit) {
838 lp->lc_flag &= ~LC_EXPIREDWANTED;
839 wakeup((caddr_t)&lp->lc_flag);
840 }
841nfsmout:
842 return (EPERM);
843 }
844 return (EPERM);
845}
846
847#endif /* NFS_NOSERVER */
848
849/*
850 * Client get lease rpc function.
851 */
852int
dadab5e9
MD
853nqnfs_getlease(struct vnode *vp, int rwflag,
854 struct ucred *cred, struct thread *td)
984263bc 855{
dadab5e9
MD
856 u_int32_t *tl;
857 caddr_t cp;
858 int32_t t1, t2;
859 struct nfsnode *np;
984263bc
MD
860 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
861 caddr_t bpos, dpos, cp2;
862 time_t reqtime;
863 int error = 0;
864 struct mbuf *mreq, *mrep, *md, *mb, *mb2;
865 int cachable;
866 u_quad_t frev;
867
868 nfsstats.rpccnt[NQNFSPROC_GETLEASE]++;
869 mb = mreq = nfsm_reqh(vp, NQNFSPROC_GETLEASE, NFSX_V3FH+2*NFSX_UNSIGNED,
870 &bpos);
871 nfsm_fhtom(vp, 1);
872 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
873 *tl++ = txdr_unsigned(rwflag);
874 *tl = txdr_unsigned(nmp->nm_leaseterm);
875 reqtime = time_second;
dadab5e9 876 nfsm_request(vp, NQNFSPROC_GETLEASE, td, cred);
984263bc
MD
877 np = VTONFS(vp);
878 nfsm_dissect(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
879 cachable = fxdr_unsigned(int, *tl++);
880 reqtime += fxdr_unsigned(int, *tl++);
881 if (reqtime > time_second) {
882 frev = fxdr_hyper(tl);
883 nqnfs_clientlease(nmp, np, rwflag, cachable, reqtime, frev);
884 nfsm_loadattr(vp, (struct vattr *)0);
885 } else
886 error = NQNFS_EXPIRED;
887 nfsm_reqdone;
888 return (error);
889}
890
891#ifndef NFS_NOSERVER
892/*
893 * Client vacated message function.
894 */
895static int
896nqnfs_vacated(vp, cred)
897 register struct vnode *vp;
898 struct ucred *cred;
899{
900 register caddr_t cp;
901 register int i;
902 register u_int32_t *tl;
903 register int32_t t2;
904 caddr_t bpos;
905 u_int32_t xid;
906 int error = 0;
907 struct mbuf *m, *mreq, *mb, *mb2, *mheadend;
908 struct nfsmount *nmp;
909 struct nfsreq myrep;
910
911 nmp = VFSTONFS(vp->v_mount);
912 nfsstats.rpccnt[NQNFSPROC_VACATED]++;
913 nfsm_reqhead(vp, NQNFSPROC_VACATED, NFSX_FH(1));
914 nfsm_fhtom(vp, 1);
915 m = mreq;
916 i = 0;
917 while (m) {
918 i += m->m_len;
919 m = m->m_next;
920 }
921 m = nfsm_rpchead(cred, nmp->nm_flag, NQNFSPROC_VACATED,
922 RPCAUTH_UNIX, 5 * NFSX_UNSIGNED, (char *)0,
923 0, (char *)NULL, mreq, i, &mheadend, &xid);
924 if (nmp->nm_sotype == SOCK_STREAM) {
925 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT);
926 *mtod(m, u_int32_t *) = htonl(0x80000000 | (m->m_pkthdr.len -
927 NFSX_UNSIGNED));
928 }
929 myrep.r_flags = 0;
930 myrep.r_nmp = nmp;
931 if (nmp->nm_soflags & PR_CONNREQUIRED)
932 (void) nfs_sndlock(&myrep);
933 (void) nfs_send(nmp->nm_so, nmp->nm_nam, m, &myrep);
934 if (nmp->nm_soflags & PR_CONNREQUIRED)
935 nfs_sndunlock(&myrep);
936nfsmout:
937 return (error);
938}
939
940/*
941 * Called for client side callbacks
942 */
943int
944nqnfs_callback(nmp, mrep, md, dpos)
945 struct nfsmount *nmp;
946 struct mbuf *mrep, *md;
947 caddr_t dpos;
948{
949 register struct vnode *vp;
950 register u_int32_t *tl;
951 register int32_t t1;
952 nfsfh_t nfh;
953 fhandle_t *fhp;
954 struct nfsnode *np;
955 struct nfsd tnfsd;
956 struct nfssvc_sock *slp;
957 struct nfsrv_descript ndesc;
958 register struct nfsrv_descript *nfsd = &ndesc;
959 struct mbuf **mrq = (struct mbuf **)0, *mb, *mreq;
960 int error = 0, cache = 0;
961 char *cp2, *bpos;
962 u_quad_t frev;
963
964#ifndef nolint
965 slp = NULL;
966#endif
967 nfsd->nd_mrep = mrep;
968 nfsd->nd_md = md;
969 nfsd->nd_dpos = dpos;
970 error = nfs_getreq(nfsd, &tnfsd, FALSE);
971 if (error)
972 return (error);
973 md = nfsd->nd_md;
974 dpos = nfsd->nd_dpos;
975 if (nfsd->nd_procnum != NQNFSPROC_EVICTED) {
976 m_freem(mrep);
977 return (EPERM);
978 }
979 fhp = &nfh.fh_generic;
980 nfsm_srvmtofh(fhp);
981 m_freem(mrep);
982 error = nfs_nget(nmp->nm_mountp, (nfsfh_t *)fhp, NFSX_V3FH, &np);
983 if (error)
984 return (error);
985 vp = NFSTOV(np);
986 if (np->n_timer.cqe_next != 0) {
987 np->n_expiry = 0;
988 np->n_flag |= NQNFSEVICTED;
989 if (nmp->nm_timerhead.cqh_first != np) {
990 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer);
991 CIRCLEQ_INSERT_HEAD(&nmp->nm_timerhead, np, n_timer);
992 }
993 }
994 vput(vp);
995 nfsm_srvdone;
996}
997
998
999/*
1000 * Nqnfs client helper daemon. Runs once a second to expire leases.
1001 * It also get authorization strings for "kerb" mounts.
1002 * It must start at the beginning of the list again after any potential
1003 * "sleep" since nfs_reclaim() called from vclean() can pull a node off
1004 * the list asynchronously.
1005 */
1006int
dadab5e9
MD
1007nqnfs_clientd(nmp, cred, ncd, flag, argp, td)
1008 struct nfsmount *nmp;
984263bc
MD
1009 struct ucred *cred;
1010 struct nfsd_cargs *ncd;
1011 int flag;
1012 caddr_t argp;
dadab5e9 1013 struct thread *td;
984263bc 1014{
dadab5e9 1015 struct nfsnode *np;
984263bc
MD
1016 struct vnode *vp;
1017 struct nfsreq myrep;
1018 struct nfsuid *nuidp, *nnuidp;
1019 int error = 0, vpid;
1020
1021 /*
1022 * First initialize some variables
1023 */
1024
1025 /*
1026 * If an authorization string is being passed in, get it.
1027 */
1028 if ((flag & NFSSVC_GOTAUTH) &&
1029 (nmp->nm_state & (NFSSTA_WAITAUTH | NFSSTA_DISMNT)) == 0) {
1030 if (nmp->nm_state & NFSSTA_HASAUTH)
1031 panic("cld kerb");
1032 if ((flag & NFSSVC_AUTHINFAIL) == 0) {
1033 if (ncd->ncd_authlen <= nmp->nm_authlen &&
1034 ncd->ncd_verflen <= nmp->nm_verflen &&
1035 !copyin(ncd->ncd_authstr,nmp->nm_authstr,ncd->ncd_authlen)&&
1036 !copyin(ncd->ncd_verfstr,nmp->nm_verfstr,ncd->ncd_verflen)){
1037 nmp->nm_authtype = ncd->ncd_authtype;
1038 nmp->nm_authlen = ncd->ncd_authlen;
1039 nmp->nm_verflen = ncd->ncd_verflen;
1040#ifdef NFSKERB
1041 nmp->nm_key = ncd->ncd_key;
1042#endif
1043 } else
1044 nmp->nm_state |= NFSSTA_AUTHERR;
1045 } else
1046 nmp->nm_state |= NFSSTA_AUTHERR;
1047 nmp->nm_state |= NFSSTA_HASAUTH;
1048 wakeup((caddr_t)&nmp->nm_authlen);
1049 } else
1050 nmp->nm_state |= NFSSTA_WAITAUTH;
1051
1052 /*
1053 * Loop every second updating queue until there is a termination sig.
1054 */
1055 while ((nmp->nm_state & NFSSTA_DISMNT) == 0) {
1056 if (nmp->nm_flag & NFSMNT_NQNFS) {
1057 /*
1058 * If there are no outstanding requests (and therefore no
1059 * processes in nfs_reply) and there is data in the receive
1060 * queue, poke for callbacks.
1061 */
1062 if (nfs_reqq.tqh_first == 0 && nmp->nm_so &&
1063 nmp->nm_so->so_rcv.sb_cc > 0) {
1064 myrep.r_flags = R_GETONEREP;
1065 myrep.r_nmp = nmp;
1066 myrep.r_mrep = (struct mbuf *)0;
dadab5e9 1067 myrep.r_td = NULL;
984263bc
MD
1068 (void) nfs_reply(&myrep);
1069 }
1070
1071 /*
1072 * Loop through the leases, updating as required.
1073 */
1074 np = nmp->nm_timerhead.cqh_first;
1075 while (np != (void *)&nmp->nm_timerhead &&
1076 (nmp->nm_state & NFSSTA_DISMINPROG) == 0) {
1077 vp = NFSTOV(np);
1078 vpid = vp->v_id;
1079 if (np->n_expiry < time_second) {
dadab5e9 1080 if (vget(vp, LK_EXCLUSIVE, td) == 0) {
984263bc
MD
1081 nmp->nm_inprog = vp;
1082 if (vpid == vp->v_id) {
1083 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer);
1084 np->n_timer.cqe_next = 0;
1085 if (np->n_flag & (NMODIFIED | NQNFSEVICTED)) {
1086 if (np->n_flag & NQNFSEVICTED) {
1087 if (vp->v_type == VDIR)
1088 nfs_invaldir(vp);
1089 cache_purge(vp);
1090 (void) nfs_vinvalbuf(vp,
dadab5e9 1091 V_SAVE, cred, td, 0);
984263bc
MD
1092 np->n_flag &= ~NQNFSEVICTED;
1093 (void) nqnfs_vacated(vp, cred);
1094 } else if (vp->v_type == VREG) {
1095 (void) VOP_FSYNC(vp, cred,
dadab5e9 1096 MNT_WAIT, td);
984263bc
MD
1097 np->n_flag &= ~NMODIFIED;
1098 }
1099 }
1100 }
1101 vput(vp);
1102 nmp->nm_inprog = NULLVP;
1103 }
1104 } else if ((np->n_expiry - NQ_RENEWAL) < time_second) {
1105 if ((np->n_flag & (NQNFSWRITE | NQNFSNONCACHE))
1106 == NQNFSWRITE &&
1107 !TAILQ_EMPTY(&vp->v_dirtyblkhd) &&
dadab5e9 1108 vget(vp, LK_EXCLUSIVE, td) == 0) {
984263bc
MD
1109 nmp->nm_inprog = vp;
1110 if (vpid == vp->v_id &&
dadab5e9 1111 nqnfs_getlease(vp, ND_WRITE, cred, td)==0)
984263bc
MD
1112 np->n_brev = np->n_lrev;
1113 vput(vp);
1114 nmp->nm_inprog = NULLVP;
1115 }
1116 } else
1117 break;
1118 if (np == nmp->nm_timerhead.cqh_first)
1119 break;
1120 np = nmp->nm_timerhead.cqh_first;
1121 }
1122 }
1123
1124 /*
1125 * Get an authorization string, if required.
1126 */
1127 if ((nmp->nm_state & (NFSSTA_WAITAUTH | NFSSTA_DISMNT | NFSSTA_HASAUTH)) == 0) {
1128 ncd->ncd_authuid = nmp->nm_authuid;
1129 if (copyout((caddr_t)ncd, argp, sizeof (struct nfsd_cargs)))
1130 nmp->nm_state |= NFSSTA_WAITAUTH;
1131 else
1132 return (ENEEDAUTH);
1133 }
1134
1135 /*
1136 * Wait a bit (no pun) and do it again.
1137 */
1138 if ((nmp->nm_state & NFSSTA_DISMNT) == 0 &&
1139 (nmp->nm_state & (NFSSTA_WAITAUTH | NFSSTA_HASAUTH))) {
1140 error = tsleep((caddr_t)&nmp->nm_authstr, PSOCK | PCATCH,
1141 "nqnfstimr", hz / 3);
1142 if (error == EINTR || error == ERESTART)
dadab5e9 1143 (void) dounmount(nmp->nm_mountp, 0, td);
984263bc
MD
1144 }
1145 }
1146
1147 /*
1148 * Finally, we can free up the mount structure.
1149 */
1150 for (nuidp = nmp->nm_uidlruhead.tqh_first; nuidp != 0; nuidp = nnuidp) {
1151 nnuidp = nuidp->nu_lru.tqe_next;
1152 LIST_REMOVE(nuidp, nu_hash);
1153 TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru);
1154 free((caddr_t)nuidp, M_NFSUID);
1155 }
1156 zfree(nfsmount_zone, nmp);
1157 if (error == EWOULDBLOCK)
1158 error = 0;
1159 return (error);
1160}
1161
1162#endif /* NFS_NOSERVER */
1163
1164/*
1165 * Adjust all timer queue expiry times when the time of day clock is changed.
1166 * Called from the settimeofday() syscall.
1167 */
1168void
dadab5e9 1169nqnfs_lease_updatetime(int deltat)
984263bc 1170{
dadab5e9 1171 struct thread *td = curthread; /* XXX */
984263bc
MD
1172 struct nqlease *lp;
1173 struct nfsnode *np;
1174 struct mount *mp, *nxtmp;
1175 struct nfsmount *nmp;
1176 int s;
1177
1178 if (nqnfsstarttime != 0)
1179 nqnfsstarttime += deltat;
1180 s = splsoftclock();
1181 for (lp = nqtimerhead.cqh_first; lp != (void *)&nqtimerhead;
1182 lp = lp->lc_timer.cqe_next)
1183 lp->lc_expiry += deltat;
1184 splx(s);
1185
1186 /*
1187 * Search the mount list for all nqnfs mounts and do their timer
1188 * queues.
1189 */
1190 simple_lock(&mountlist_slock);
1191 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nxtmp) {
dadab5e9 1192 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock, td)) {
984263bc
MD
1193 nxtmp = TAILQ_NEXT(mp, mnt_list);
1194 continue;
1195 }
1196 if (mp->mnt_stat.f_type == nfs_mount_type) {
1197 nmp = VFSTONFS(mp);
1198 if (nmp->nm_flag & NFSMNT_NQNFS) {
1199 for (np = nmp->nm_timerhead.cqh_first;
1200 np != (void *)&nmp->nm_timerhead;
1201 np = np->n_timer.cqe_next) {
1202 np->n_expiry += deltat;
1203 }
1204 }
1205 }
1206 simple_lock(&mountlist_slock);
1207 nxtmp = TAILQ_NEXT(mp, mnt_list);
dadab5e9 1208 vfs_unbusy(mp, td);
984263bc
MD
1209 }
1210 simple_unlock(&mountlist_slock);
1211}
1212
1213#ifndef NFS_NOSERVER
1214/*
1215 * Lock a server lease.
1216 */
1217static void
1218nqsrv_locklease(lp)
1219 struct nqlease *lp;
1220{
1221
1222 while (lp->lc_flag & LC_LOCKED) {
1223 lp->lc_flag |= LC_WANTED;
1224 (void) tsleep((caddr_t)lp, PSOCK, "nqlc", 0);
1225 }
1226 lp->lc_flag |= LC_LOCKED;
1227 lp->lc_flag &= ~LC_WANTED;
1228}
1229
1230/*
1231 * Unlock a server lease.
1232 */
1233static void
1234nqsrv_unlocklease(lp)
1235 struct nqlease *lp;
1236{
1237
1238 lp->lc_flag &= ~LC_LOCKED;
1239 if (lp->lc_flag & LC_WANTED)
1240 wakeup((caddr_t)lp);
1241}
1242#endif /* NFS_NOSERVER */
1243
1244/*
1245 * Update a client lease.
1246 */
1247void
1248nqnfs_clientlease(nmp, np, rwflag, cachable, expiry, frev)
1249 register struct nfsmount *nmp;
1250 register struct nfsnode *np;
1251 int rwflag, cachable;
1252 time_t expiry;
1253 u_quad_t frev;
1254{
1255 register struct nfsnode *tp;
1256
1257 if (np->n_timer.cqe_next != 0) {
1258 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer);
1259 if (rwflag == ND_WRITE)
1260 np->n_flag |= NQNFSWRITE;
1261 } else if (rwflag == ND_READ)
1262 np->n_flag &= ~NQNFSWRITE;
1263 else
1264 np->n_flag |= NQNFSWRITE;
1265 if (cachable)
1266 np->n_flag &= ~NQNFSNONCACHE;
1267 else
1268 np->n_flag |= NQNFSNONCACHE;
1269 np->n_expiry = expiry;
1270 np->n_lrev = frev;
1271 tp = nmp->nm_timerhead.cqh_last;
1272 while (tp != (void *)&nmp->nm_timerhead && tp->n_expiry > np->n_expiry)
1273 tp = tp->n_timer.cqe_prev;
1274 if (tp == (void *)&nmp->nm_timerhead) {
1275 CIRCLEQ_INSERT_HEAD(&nmp->nm_timerhead, np, n_timer);
1276 } else {
1277 CIRCLEQ_INSERT_AFTER(&nmp->nm_timerhead, tp, np, n_timer);
1278 }
1279}