Cleanup some dangling issues with cache_inval(). A lot of hard work went
[dragonfly.git] / sys / vfs / nfs / nfs_nqlease.c
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 $
38  * $DragonFly: src/sys/vfs/nfs/Attic/nfs_nqlease.c,v 1.21 2004/11/18 20:04:28 dillon Exp $
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 "rpcv2.h"
71 #include "nfsproto.h"
72 #include "nfs.h"
73 #include "nfsm_subs.h"
74 #include "xdr_subs.h"
75 #include "nqnfs.h"
76 #include "nfsmount.h"
77 #include "nfsnode.h"
78
79 static MALLOC_DEFINE(M_NQMHOST, "NQNFS Host", "Nqnfs host address table");
80
81 time_t nqnfsstarttime = (time_t)0;
82 int nqsrv_clockskew = NQ_CLOCKSKEW;
83 int nqsrv_writeslack = NQ_WRITESLACK;
84 int nqsrv_maxlease = NQ_MAXLEASE;
85 #ifndef NFS_NOSERVER
86 static int nqsrv_maxnumlease = NQ_MAXNUMLEASE;
87 #endif
88
89 struct vop_lease_args;
90
91 #ifndef NFS_NOSERVER
92 static int      nqsrv_cmpnam (struct nfssvc_sock *, struct sockaddr *,
93                         struct nqhost *);
94 static int      nqnfs_vacated (struct vnode *vp, struct ucred *cred);
95 static void     nqsrv_addhost (struct nqhost *lph, struct nfssvc_sock *slp,
96                                    struct sockaddr *nam);
97 static void     nqsrv_instimeq (struct nqlease *lp, u_int32_t duration);
98 static void     nqsrv_locklease (struct nqlease *lp);
99 static void     nqsrv_send_eviction (struct vnode *vp, struct nqlease *lp,
100                                          struct nfssvc_sock *slp,
101                                          struct sockaddr *nam, 
102                                          struct ucred *cred);
103 static void     nqsrv_unlocklease (struct nqlease *lp);
104 static void     nqsrv_waitfor_expiry (struct nqlease *lp);
105 #endif
106 extern void     nqnfs_lease_updatetime (int deltat);
107
108 /*
109  * Signifies which rpcs can have piggybacked lease requests
110  */
111 int 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
140 extern nfstype nfsv2_type[9];
141 extern nfstype nfsv3_type[9];
142 extern int nfsd_waiting;
143 extern 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  */
172 int
173 nqsrv_getlease(struct vnode *vp, u_int32_t *duration, int flags,
174                struct nfssvc_sock *slp, struct thread *td,
175                struct sockaddr *nam, int *cachablep, u_quad_t *frev,
176                struct ucred *cred)
177 {
178         struct nqlease *lp;
179         struct nqfhhashhead *lpp = NULL;
180         struct nqhost *lph = NULL;
181         struct nqlease *tlp;
182         struct nqm **lphp;
183         struct vattr vattr;
184         fhandle_t fh;
185         int i, ok, error, s;
186
187         if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
188                 return (0);
189         if (*duration > nqsrv_maxlease)
190                 *duration = nqsrv_maxlease;
191         error = VOP_GETATTR(vp, &vattr, td);
192         if (error)
193                 return (error);
194         *frev = vattr.va_filerev;
195         s = splsoftclock();
196         tlp = vp->v_lease;
197         if ((flags & ND_CHECK) == 0)
198                 nfsstats.srvnqnfs_getleases++;
199         if (tlp == 0) {
200                 /*
201                  * Find the lease by searching the hash list.
202                  */
203                 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
204                 error = VFS_VPTOFH(vp, &fh.fh_fid);
205                 if (error) {
206                         splx(s);
207                         return (error);
208                 }
209                 lpp = NQFHHASH(fh.fh_fid.fid_data);
210                 for (lp = lpp->lh_first; lp != 0; lp = lp->lc_hash.le_next)
211                         if (fh.fh_fsid.val[0] == lp->lc_fsid.val[0] &&
212                             fh.fh_fsid.val[1] == lp->lc_fsid.val[1] &&
213                             !bcmp(fh.fh_fid.fid_data, lp->lc_fiddata,
214                                   fh.fh_fid.fid_len - sizeof (int32_t))) {
215                                 /* Found it */
216                                 lp->lc_vp = vp;
217                                 vp->v_lease = lp;
218                                 tlp = lp;
219                                 break;
220                         }
221         } else
222                 lp = tlp;
223         if (lp != 0) {
224                 if ((lp->lc_flag & LC_NONCACHABLE) ||
225                     (lp->lc_morehosts == (struct nqm *)0 &&
226                      nqsrv_cmpnam(slp, nam, &lp->lc_host)))
227                         goto doreply;
228                 if ((flags & ND_READ) && (lp->lc_flag & LC_WRITE) == 0) {
229                         if (flags & ND_CHECK)
230                                 goto doreply;
231                         if (nqsrv_cmpnam(slp, nam, &lp->lc_host))
232                                 goto doreply;
233                         i = 0;
234                         if (lp->lc_morehosts) {
235                                 lph = lp->lc_morehosts->lpm_hosts;
236                                 lphp = &lp->lc_morehosts->lpm_next;
237                                 ok = 1;
238                         } else {
239                                 lphp = &lp->lc_morehosts;
240                                 ok = 0;
241                         }
242                         while (ok && (lph->lph_flag & LC_VALID)) {
243                                 if (nqsrv_cmpnam(slp, nam, lph))
244                                         goto doreply;
245                                 if (++i == LC_MOREHOSTSIZ) {
246                                         i = 0;
247                                         if (*lphp) {
248                                                 lph = (*lphp)->lpm_hosts;
249                                                 lphp = &((*lphp)->lpm_next);
250                                         } else
251                                                 ok = 0;
252                                 } else
253                                         lph++;
254                         }
255                         nqsrv_locklease(lp);
256                         if (!ok) {
257                                 *lphp = (struct nqm *)
258                                         malloc(sizeof (struct nqm),
259                                                 M_NQMHOST, M_WAITOK);
260                                 bzero((caddr_t)*lphp, sizeof (struct nqm));
261                                 lph = (*lphp)->lpm_hosts;
262                         }
263                         nqsrv_addhost(lph, slp, nam);
264                         nqsrv_unlocklease(lp);
265                 } else {
266                         lp->lc_flag |= LC_NONCACHABLE;
267                         nqsrv_locklease(lp);
268                         nqsrv_send_eviction(vp, lp, slp, nam, cred);
269                         nqsrv_waitfor_expiry(lp);
270                         nqsrv_unlocklease(lp);
271                 }
272 doreply:
273                 /*
274                  * Update the lease and return
275                  */
276                 if ((flags & ND_CHECK) == 0)
277                         nqsrv_instimeq(lp, *duration);
278                 if (lp->lc_flag & LC_NONCACHABLE)
279                         *cachablep = 0;
280                 else {
281                         *cachablep = 1;
282                         if (flags & ND_WRITE)
283                                 lp->lc_flag |= LC_WRITTEN;
284                 }
285                 splx(s);
286                 return (0);
287         }
288         splx(s);
289         if (flags & ND_CHECK)
290                 return (0);
291
292         /*
293          * Allocate new lease
294          * The value of nqsrv_maxnumlease should be set generously, so that
295          * the following "printf" happens infrequently.
296          */
297         if (nfsstats.srvnqnfs_leases > nqsrv_maxnumlease) {
298                 printf("Nqnfs server, too many leases\n");
299                 do {
300                         (void) tsleep((caddr_t)&lbolt, 0, "nqsrvnuml", 0);
301                 } while (nfsstats.srvnqnfs_leases > nqsrv_maxnumlease);
302         }
303         MALLOC(lp, struct nqlease *, sizeof (struct nqlease), M_NQLEASE, M_WAITOK);
304         bzero((caddr_t)lp, sizeof (struct nqlease));
305         if (flags & ND_WRITE)
306                 lp->lc_flag |= (LC_WRITE | LC_WRITTEN);
307         nqsrv_addhost(&lp->lc_host, slp, nam);
308         lp->lc_vp = vp;
309         lp->lc_fsid = fh.fh_fsid;
310         bcopy(fh.fh_fid.fid_data, lp->lc_fiddata,
311                 fh.fh_fid.fid_len - sizeof (int32_t));
312         if(!lpp)
313                 panic("nfs_nqlease.c: Phoney lpp");
314         LIST_INSERT_HEAD(lpp, lp, lc_hash);
315         vp->v_lease = lp;
316         s = splsoftclock();
317         nqsrv_instimeq(lp, *duration);
318         splx(s);
319         *cachablep = 1;
320         if (++nfsstats.srvnqnfs_leases > nfsstats.srvnqnfs_maxleases)
321                 nfsstats.srvnqnfs_maxleases = nfsstats.srvnqnfs_leases;
322         return (0);
323 }
324
325 /*
326  * Local lease check for server syscalls.
327  * Just set up args and let nqsrv_getlease() do the rest.
328  * nqnfs_vop_lease_check() is the VOP_LEASE() form of the same routine.
329  * Ifdef'd code in nfsnode.h renames these routines to whatever a particular
330  * OS needs.
331  */
332 int
333 nqnfs_lease_check(struct vnode *vp, struct thread *td,
334                   struct ucred *cred, int flag)
335 {
336         u_int32_t duration = 0;
337         int cache;
338         u_quad_t frev;
339
340         nqsrv_getlease(vp, &duration, ND_CHECK | flag, NQLOCALSLP,
341                 td, (struct sockaddr *)0, &cache, &frev, cred);
342         return(0);
343 }
344
345 /*
346  * nqnfs_vop_lease_check(struct vnode *a_vp, struct thread *a_td,
347  *                       struct ucred *a_cred, int a_flag)
348  */
349 int
350 nqnfs_vop_lease_check(struct vop_lease_args *ap)
351 {
352         u_int32_t duration = 0;
353         int cache;
354         u_quad_t frev;
355
356         (void) nqsrv_getlease(ap->a_vp, &duration, ND_CHECK | ap->a_flag,
357                               NQLOCALSLP, ap->a_td, (struct sockaddr *)0,
358                               &cache, &frev, ap->a_cred);
359         return (0);
360 }
361
362
363 /*
364  * Add a host to an nqhost structure for a lease.
365  */
366 static void
367 nqsrv_addhost(struct nqhost *lph, struct nfssvc_sock *slp, struct sockaddr *nam)
368 {
369         struct sockaddr_in *saddr;
370         struct socket *nsso;
371
372         if (slp == NQLOCALSLP) {
373                 lph->lph_flag |= (LC_VALID | LC_LOCAL);
374                 return;
375         }
376         nsso = slp->ns_so;
377         lph->lph_slp = slp;
378         if (nsso && nsso->so_proto->pr_protocol == IPPROTO_UDP) {
379                 saddr = (struct sockaddr_in *)nam;
380                 lph->lph_flag |= (LC_VALID | LC_UDP);
381                 lph->lph_inetaddr = saddr->sin_addr.s_addr;
382                 lph->lph_port = saddr->sin_port;
383         } else {
384                 lph->lph_flag |= (LC_VALID | LC_SREF);
385                 slp->ns_sref++;
386         }
387 }
388
389 /*
390  * Update the lease expiry time and position it in the timer queue correctly.
391  */
392 static void
393 nqsrv_instimeq(struct nqlease *lp, u_int32_t duration)
394 {
395         struct nqlease *tlp;
396         time_t newexpiry;
397
398         newexpiry = time_second + duration + nqsrv_clockskew;
399         if (lp->lc_expiry == newexpiry)
400                 return;
401         if (lp->lc_timer.cqe_next != 0) {
402                 CIRCLEQ_REMOVE(&nqtimerhead, lp, lc_timer);
403         }
404         lp->lc_expiry = newexpiry;
405
406         /*
407          * Find where in the queue it should be.
408          */
409         tlp = nqtimerhead.cqh_last;
410         while (tlp != (void *)&nqtimerhead && tlp->lc_expiry > newexpiry)
411                 tlp = tlp->lc_timer.cqe_prev;
412 #ifdef HASNVRAM
413         if (tlp == nqtimerhead.cqh_last)
414                 NQSTORENOVRAM(newexpiry);
415 #endif /* HASNVRAM */
416         if (tlp == (void *)&nqtimerhead) {
417                 CIRCLEQ_INSERT_HEAD(&nqtimerhead, lp, lc_timer);
418         } else {
419                 CIRCLEQ_INSERT_AFTER(&nqtimerhead, tlp, lp, lc_timer);
420         }
421 }
422
423 /*
424  * Compare the requesting host address with the lph entry in the lease.
425  * Return true iff it is the same.
426  * This is somewhat messy due to the union in the nqhost structure.
427  * The local host is indicated by the special value of NQLOCALSLP for slp.
428  */
429 static int
430 nqsrv_cmpnam(struct nfssvc_sock *slp, struct sockaddr *nam, struct nqhost *lph)
431 {
432         struct sockaddr_in *saddr;
433         struct sockaddr *addr;
434         union nethostaddr lhaddr;
435         struct socket *nsso;
436         int ret;
437
438         if (slp == NQLOCALSLP) {
439                 if (lph->lph_flag & LC_LOCAL)
440                         return (1);
441                 else
442                         return (0);
443         }
444         nsso = slp->ns_so;
445         if (nsso && nsso->so_proto->pr_protocol == IPPROTO_UDP) {
446                 addr = nam;
447         } else {
448                 addr = slp->ns_nam;
449         }
450         if (lph->lph_flag & LC_UDP) {
451                 ret = netaddr_match(AF_INET, &lph->lph_haddr, addr);
452         } else {
453                 if ((lph->lph_slp->ns_flag & SLP_VALID) == 0)
454                         return (0);
455                 saddr = (struct sockaddr_in *)lph->lph_slp->ns_nam;
456                 if (saddr->sin_family == AF_INET)
457                         lhaddr.had_inetaddr = saddr->sin_addr.s_addr;
458                 else
459                         lhaddr.had_nam = lph->lph_slp->ns_nam;
460                 ret = netaddr_match(saddr->sin_family, &lhaddr, addr);
461         }
462         return (ret);
463 }
464
465 /*
466  * Send out eviction notice messages to all other hosts for the lease.
467  */
468 static void
469 nqsrv_send_eviction(struct vnode *vp, struct nqlease *lp,
470                     struct nfssvc_sock *slp, struct sockaddr *nam,
471                     struct ucred *cred)
472 {
473         struct nqhost *lph = &lp->lc_host;
474         int siz;
475         struct nqm *lphnext = lp->lc_morehosts;
476         struct mbuf *m, *mreq, *mb, *mb2, *mheadend;
477         struct sockaddr *nam2;
478         struct sockaddr_in *saddr;
479         nfsfh_t nfh;
480         fhandle_t *fhp;
481         caddr_t bpos, cp;
482         u_int32_t xid, *tl;
483         int len = 1, ok = 1, i = 0;
484
485         while (ok && (lph->lph_flag & LC_VALID)) {
486                 if (nqsrv_cmpnam(slp, nam, lph)) {
487                         lph->lph_flag |= LC_VACATED;
488                 } else if ((lph->lph_flag & (LC_LOCAL | LC_VACATED)) == 0) {
489                         struct socket *so;
490                         int sotype;
491                         int *solockp = NULL;
492
493                         so = lph->lph_slp->ns_so;
494                         if (lph->lph_flag & LC_UDP) {
495                                 MALLOC(nam2, struct sockaddr *,
496                                        sizeof *nam2, M_SONAME, M_WAITOK);
497                                 saddr = (struct sockaddr_in *)nam2;
498                                 saddr->sin_len = sizeof *saddr;
499                                 saddr->sin_family = AF_INET;
500                                 saddr->sin_addr.s_addr = lph->lph_inetaddr;
501                                 saddr->sin_port = lph->lph_port;
502                         } else if (lph->lph_slp->ns_flag & SLP_VALID) {
503                                 nam2 = (struct sockaddr *)0;
504                         } else {
505                                 goto nextone;
506                         }
507                         sotype = so->so_type;
508                         if (so->so_proto->pr_flags & PR_CONNREQUIRED)
509                                 solockp = &lph->lph_slp->ns_solock;
510                         nfsm_reqhead((struct vnode *)0, NQNFSPROC_EVICTED,
511                                 NFSX_V3FH + NFSX_UNSIGNED);
512                         fhp = &nfh.fh_generic;
513                         bzero((caddr_t)fhp, sizeof(nfh));
514                         fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
515                         VFS_VPTOFH(vp, &fhp->fh_fid);
516                         nfsm_srvfhtom(fhp, 1);
517                         m = mreq;
518                         siz = 0;
519                         while (m) {
520                                 siz += m->m_len;
521                                 m = m->m_next;
522                         }
523                         if (siz <= 0 || siz > NFS_MAXPACKET) {
524                                 printf("mbuf siz=%d\n",siz);
525                                 panic("Bad nfs svc reply");
526                         }
527                         m = nfsm_rpchead(cred, (NFSMNT_NFSV3 | NFSMNT_NQNFS),
528                                 NQNFSPROC_EVICTED,
529                                 RPCAUTH_UNIX, 5 * NFSX_UNSIGNED, (char *)0,
530                                 0, (char *)NULL, mreq, siz, &mheadend, &xid);
531                         /*
532                          * For stream protocols, prepend a Sun RPC
533                          * Record Mark.
534                          */
535                         if (sotype == SOCK_STREAM) {
536                                 M_PREPEND(m, NFSX_UNSIGNED, MB_WAIT);
537                                 /* XXX-MBUF */
538                                 printf("nfs_nqlease: M_PREPEND failed\n");
539                                 *mtod(m, u_int32_t *) = htonl(0x80000000 |
540                                         (m->m_pkthdr.len - NFSX_UNSIGNED));
541                         }
542                         /*
543                          * nfs_sndlock if PR_CONNREQUIRED XXX
544                          */
545
546                         if ((lph->lph_flag & LC_UDP) == 0 &&
547                             ((lph->lph_slp->ns_flag & SLP_VALID) == 0 ||
548                             nfs_slplock(lph->lph_slp, 0) == 0)) {
549                                 m_freem(m);
550                         } else {
551                                 (void) nfs_send(so, nam2, m,
552                                                 (struct nfsreq *)0);
553                                 if (solockp)
554                                         nfs_slpunlock(lph->lph_slp);
555                         }
556                         if (lph->lph_flag & LC_UDP)
557                                 FREE(nam2, M_SONAME);
558                 }
559 nextone:
560                 if (++i == len) {
561                         if (lphnext) {
562                                 i = 0;
563                                 len = LC_MOREHOSTSIZ;
564                                 lph = lphnext->lpm_hosts;
565                                 lphnext = lphnext->lpm_next;
566                         } else
567                                 ok = 0;
568                 } else
569                         lph++;
570         }
571 }
572
573 /*
574  * Wait for the lease to expire.
575  * This will occur when all clients have sent "vacated" messages to
576  * this server OR when it expires do to timeout.
577  */
578 static void
579 nqsrv_waitfor_expiry(struct nqlease *lp)
580 {
581         struct nqhost *lph;
582         int i;
583         struct nqm *lphnext;
584         int len, ok;
585
586 tryagain:
587         if (time_second > lp->lc_expiry)
588                 return;
589         lph = &lp->lc_host;
590         lphnext = lp->lc_morehosts;
591         len = 1;
592         i = 0;
593         ok = 1;
594         while (ok && (lph->lph_flag & LC_VALID)) {
595                 if ((lph->lph_flag & (LC_LOCAL | LC_VACATED)) == 0) {
596                         lp->lc_flag |= LC_EXPIREDWANTED;
597                         (void) tsleep((caddr_t)&lp->lc_flag, 0, "nqexp", 0);
598                         goto tryagain;
599                 }
600                 if (++i == len) {
601                         if (lphnext) {
602                                 i = 0;
603                                 len = LC_MOREHOSTSIZ;
604                                 lph = lphnext->lpm_hosts;
605                                 lphnext = lphnext->lpm_next;
606                         } else
607                                 ok = 0;
608                 } else
609                         lph++;
610         }
611 }
612
613 /*
614  * Nqnfs server timer that maintains the server lease queue.
615  * Scan the lease queue for expired entries:
616  * - when one is found, wakeup anyone waiting for it
617  *   else dequeue and free
618  */
619 void
620 nqnfs_serverd(void)
621 {
622         struct nqlease *lp;
623         struct nqhost *lph;
624         struct nqlease *nextlp;
625         struct nqm *lphnext, *olphnext;
626         int i, len, ok;
627
628         for (lp = nqtimerhead.cqh_first; lp != (void *)&nqtimerhead;
629             lp = nextlp) {
630                 if (lp->lc_expiry >= time_second)
631                         break;
632                 nextlp = lp->lc_timer.cqe_next;
633                 if (lp->lc_flag & LC_EXPIREDWANTED) {
634                         lp->lc_flag &= ~LC_EXPIREDWANTED;
635                         wakeup((caddr_t)&lp->lc_flag);
636                 } else if ((lp->lc_flag & (LC_LOCKED | LC_WANTED)) == 0) {
637                     /*
638                      * Make a best effort at keeping a write caching lease long
639                      * enough by not deleting it until it has been explicitly
640                      * vacated or there have been no writes in the previous
641                      * write_slack seconds since expiry and the nfsds are not
642                      * all busy. The assumption is that if the nfsds are not
643                      * all busy now (no queue of nfs requests), then the client
644                      * would have been able to do at least one write to the
645                      * file during the last write_slack seconds if it was still
646                      * trying to push writes to the server.
647                      */
648                     if ((lp->lc_flag & (LC_WRITE | LC_VACATED)) == LC_WRITE &&
649                         ((lp->lc_flag & LC_WRITTEN) || nfsd_waiting == 0)) {
650                         lp->lc_flag &= ~LC_WRITTEN;
651                         nqsrv_instimeq(lp, nqsrv_writeslack);
652                     } else {
653                         CIRCLEQ_REMOVE(&nqtimerhead, lp, lc_timer);
654                         LIST_REMOVE(lp, lc_hash);
655                         /*
656                          * This soft reference may no longer be valid, but
657                          * no harm done. The worst case is if the vnode was
658                          * recycled and has another valid lease reference,
659                          * which is dereferenced prematurely.
660                          */
661                         lp->lc_vp->v_lease = (struct nqlease *)0;
662                         lph = &lp->lc_host;
663                         lphnext = lp->lc_morehosts;
664                         olphnext = (struct nqm *)0;
665                         len = 1;
666                         i = 0;
667                         ok = 1;
668                         while (ok && (lph->lph_flag & LC_VALID)) {
669                                 if (lph->lph_flag & LC_SREF)
670                                         nfsrv_slpderef(lph->lph_slp);
671                                 if (++i == len) {
672                                         if (olphnext) {
673                                                 free((caddr_t)olphnext, M_NQMHOST);
674                                                 olphnext = (struct nqm *)0;
675                                         }
676                                         if (lphnext) {
677                                                 olphnext = lphnext;
678                                                 i = 0;
679                                                 len = LC_MOREHOSTSIZ;
680                                                 lph = lphnext->lpm_hosts;
681                                                 lphnext = lphnext->lpm_next;
682                                         } else
683                                                 ok = 0;
684                                 } else
685                                         lph++;
686                         }
687                         FREE((caddr_t)lp, M_NQLEASE);
688                         if (olphnext)
689                                 free((caddr_t)olphnext, M_NQMHOST);
690                         nfsstats.srvnqnfs_leases--;
691                     }
692                 }
693         }
694 }
695
696 /*
697  * Called from nfssvc_nfsd() for a getlease rpc request.
698  * Do the from/to xdr translation and call nqsrv_getlease() to
699  * do the real work.
700  */
701 int
702 nqnfsrv_getlease(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
703                  struct thread *td, struct mbuf **mrq)
704 {
705         struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
706         struct sockaddr *nam = nfsd->nd_nam;
707         caddr_t dpos = nfsd->nd_dpos;
708         struct ucred *cred = &nfsd->nd_cr;
709         struct nfs_fattr *fp;
710         struct vattr va;
711         struct vattr *vap = &va;
712         struct vnode *vp;
713         nfsfh_t nfh;
714         fhandle_t *fhp;
715         u_int32_t *tl;
716         int32_t t1;
717         u_quad_t frev;
718         caddr_t bpos;
719         int error = 0;
720         char *cp2;
721         struct mbuf *mb, *mb2, *mreq;
722         int flags, rdonly, cache;
723
724         fhp = &nfh.fh_generic;
725         nfsm_srvmtofh(fhp);
726         nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
727         flags = fxdr_unsigned(int, *tl++);
728         nfsd->nd_duration = fxdr_unsigned(int, *tl);
729         error = nfsrv_fhtovp(fhp, 1, &vp, cred, slp, nam, &rdonly,
730                 (nfsd->nd_flag & ND_KERBAUTH), TRUE);
731         if (error) {
732                 nfsm_reply(0);
733                 goto nfsmout;
734         }
735         if (rdonly && flags == ND_WRITE) {
736                 error = EROFS;
737                 vput(vp);
738                 nfsm_reply(0);
739         }
740         (void) nqsrv_getlease(vp, &nfsd->nd_duration, flags, slp, td,
741                 nam, &cache, &frev, cred);
742         error = VOP_GETATTR(vp, vap, td);
743         vput(vp);
744         nfsm_reply(NFSX_V3FATTR + 4 * NFSX_UNSIGNED);
745         nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
746         *tl++ = txdr_unsigned(cache);
747         *tl++ = txdr_unsigned(nfsd->nd_duration);
748         txdr_hyper(frev, tl);
749         nfsm_build(fp, struct nfs_fattr *, NFSX_V3FATTR);
750         nfsm_srvfillattr(vap, fp);
751         nfsm_srvdone;
752 }
753
754 /*
755  * Called from nfssvc_nfsd() when a "vacated" message is received from a
756  * client. Find the entry and expire it.
757  */
758 int
759 nqnfsrv_vacated(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
760                 struct thread *td, struct mbuf **mrq)
761 {
762         struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md;
763         struct sockaddr *nam = nfsd->nd_nam;
764         caddr_t dpos = nfsd->nd_dpos;
765         struct nqlease *lp;
766         struct nqhost *lph;
767         struct nqlease *tlp = (struct nqlease *)0;
768         nfsfh_t nfh;
769         fhandle_t *fhp;
770         u_int32_t *tl;
771         int32_t t1;
772         struct nqm *lphnext;
773         struct mbuf *mreq, *mb;
774         int error = 0, i, len, ok, gotit = 0, cache = 0;
775         char *cp2, *bpos;
776         u_quad_t frev;
777
778         fhp = &nfh.fh_generic;
779         nfsm_srvmtofh(fhp);
780         m_freem(mrep);
781         /*
782          * Find the lease by searching the hash list.
783          */
784         for (lp = NQFHHASH(fhp->fh_fid.fid_data)->lh_first; lp != 0;
785             lp = lp->lc_hash.le_next)
786                 if (fhp->fh_fsid.val[0] == lp->lc_fsid.val[0] &&
787                     fhp->fh_fsid.val[1] == lp->lc_fsid.val[1] &&
788                     !bcmp(fhp->fh_fid.fid_data, lp->lc_fiddata,
789                           MAXFIDSZ)) {
790                         /* Found it */
791                         tlp = lp;
792                         break;
793                 }
794         if (tlp != 0) {
795                 lp = tlp;
796                 len = 1;
797                 i = 0;
798                 lph = &lp->lc_host;
799                 lphnext = lp->lc_morehosts;
800                 ok = 1;
801                 while (ok && (lph->lph_flag & LC_VALID)) {
802                         if (nqsrv_cmpnam(slp, nam, lph)) {
803                                 lph->lph_flag |= LC_VACATED;
804                                 gotit++;
805                                 break;
806                         }
807                         if (++i == len) {
808                                 if (lphnext) {
809                                         len = LC_MOREHOSTSIZ;
810                                         i = 0;
811                                         lph = lphnext->lpm_hosts;
812                                         lphnext = lphnext->lpm_next;
813                                 } else
814                                         ok = 0;
815                         } else
816                                 lph++;
817                 }
818                 if ((lp->lc_flag & LC_EXPIREDWANTED) && gotit) {
819                         lp->lc_flag &= ~LC_EXPIREDWANTED;
820                         wakeup((caddr_t)&lp->lc_flag);
821                 }
822 nfsmout:
823                 return (EPERM);
824         }
825         return (EPERM);
826 }
827
828 #endif /* NFS_NOSERVER */
829
830 /*
831  * Client get lease rpc function.
832  */
833 int
834 nqnfs_getlease(struct vnode *vp, int rwflag, struct thread *td)
835 {
836         u_int32_t *tl;
837         caddr_t cp;
838         int32_t t1, t2;
839         struct nfsnode *np;
840         struct nfsmount *nmp = VFSTONFS(vp->v_mount);
841         caddr_t bpos, dpos, cp2;
842         time_t reqtime;
843         int error = 0;
844         struct mbuf *mreq, *mrep, *md, *mb, *mb2;
845         int cachable;
846         u_quad_t frev;
847
848         nfsstats.rpccnt[NQNFSPROC_GETLEASE]++;
849         mb = mreq = nfsm_reqh(vp, NQNFSPROC_GETLEASE, NFSX_V3FH+2*NFSX_UNSIGNED,
850                  &bpos);
851         nfsm_fhtom(vp, 1);
852         nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
853         *tl++ = txdr_unsigned(rwflag);
854         *tl = txdr_unsigned(nmp->nm_leaseterm);
855         reqtime = time_second;
856         nfsm_request(vp, NQNFSPROC_GETLEASE, td, nfs_vpcred(vp, rwflag));
857         np = VTONFS(vp);
858         nfsm_dissect(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
859         cachable = fxdr_unsigned(int, *tl++);
860         reqtime += fxdr_unsigned(int, *tl++);
861         if (reqtime > time_second) {
862                 frev = fxdr_hyper(tl);
863                 nqnfs_clientlease(nmp, np, rwflag, cachable, reqtime, frev);
864                 nfsm_loadattr(vp, (struct vattr *)0);
865         } else {
866                 error = NQNFS_EXPIRED;
867         }
868         m_freem(mrep);
869 nfsmout:
870         return (error);
871 }
872
873 #ifndef NFS_NOSERVER 
874 /*
875  * Client vacated message function.
876  */
877 static int
878 nqnfs_vacated(struct vnode *vp, struct ucred *cred)
879 {
880         caddr_t cp;
881         int i;
882         u_int32_t *tl;
883         int32_t t2;
884         caddr_t bpos;
885         u_int32_t xid;
886         int error = 0;
887         struct mbuf *m, *mreq, *mb, *mb2, *mheadend;
888         struct nfsmount *nmp;
889         struct nfsreq myrep;
890
891         nmp = VFSTONFS(vp->v_mount);
892         nfsstats.rpccnt[NQNFSPROC_VACATED]++;
893         nfsm_reqhead(vp, NQNFSPROC_VACATED, NFSX_FH(1));
894         nfsm_fhtom(vp, 1);
895         m = mreq;
896         i = 0;
897         while (m) {
898                 i += m->m_len;
899                 m = m->m_next;
900         }
901         m = nfsm_rpchead(cred, nmp->nm_flag, NQNFSPROC_VACATED,
902                 RPCAUTH_UNIX, 5 * NFSX_UNSIGNED, (char *)0,
903                 0, (char *)NULL, mreq, i, &mheadend, &xid);
904         if (nmp->nm_sotype == SOCK_STREAM) {
905                 M_PREPEND(m, NFSX_UNSIGNED, MB_WAIT);
906                 if (m == NULL)
907                         return (ENOBUFS);
908                 *mtod(m, u_int32_t *) = htonl(0x80000000 | (m->m_pkthdr.len -
909                         NFSX_UNSIGNED));
910         }
911         myrep.r_flags = 0;
912         myrep.r_nmp = nmp;
913         myrep.r_td = NULL;
914         if (nmp->nm_soflags & PR_CONNREQUIRED)
915                 (void) nfs_sndlock(&myrep);
916         (void) nfs_send(nmp->nm_so, nmp->nm_nam, m, &myrep);
917         if (nmp->nm_soflags & PR_CONNREQUIRED)
918                 nfs_sndunlock(&myrep);
919 nfsmout:
920         return (error);
921 }
922
923 /*
924  * Called for client side callbacks
925  */
926 int
927 nqnfs_callback(struct nfsmount *nmp, struct mbuf *mrep, struct mbuf *md,
928                caddr_t dpos)
929 {
930         struct vnode *vp;
931         u_int32_t *tl;
932         int32_t t1;
933         nfsfh_t nfh;
934         fhandle_t *fhp;
935         struct nfsnode *np;
936         struct nfsd tnfsd;
937         struct nfssvc_sock *slp;
938         struct nfsrv_descript ndesc;
939         struct nfsrv_descript *nfsd = &ndesc;
940         struct mbuf **mrq = (struct mbuf **)0, *mb, *mreq;
941         int error = 0, cache = 0;
942         char *cp2, *bpos;
943         u_quad_t frev;
944
945 #ifndef nolint
946         slp = NULL;
947 #endif
948         nfsd->nd_mrep = mrep;
949         nfsd->nd_md = md;
950         nfsd->nd_dpos = dpos;
951         error = nfs_getreq(nfsd, &tnfsd, FALSE);
952         if (error)
953                 return (error);
954         md = nfsd->nd_md;
955         dpos = nfsd->nd_dpos;
956         if (nfsd->nd_procnum != NQNFSPROC_EVICTED) {
957                 m_freem(mrep);
958                 return (EPERM);
959         }
960         fhp = &nfh.fh_generic;
961         nfsm_srvmtofh(fhp);
962         m_freem(mrep);
963         error = nfs_nget(nmp->nm_mountp, (nfsfh_t *)fhp, NFSX_V3FH, &np);
964         if (error)
965                 return (error);
966         vp = NFSTOV(np);
967         if (np->n_timer.cqe_next != 0) {
968                 np->n_expiry = 0;
969                 np->n_flag |= NQNFSEVICTED;
970                 if (nmp->nm_timerhead.cqh_first != np) {
971                         CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer);
972                         CIRCLEQ_INSERT_HEAD(&nmp->nm_timerhead, np, n_timer);
973                 }
974         }
975         vput(vp);
976         nfsm_srvdone;
977 }
978
979
980 /*
981  * Nqnfs client helper daemon. Runs once a second to expire leases.
982  * It also get authorization strings for "kerb" mounts.
983  * It must start at the beginning of the list again after any potential
984  * "sleep" since nfs_reclaim() called from vclean() can pull a node off
985  * the list asynchronously.
986  */
987 int
988 nqnfs_clientd(struct nfsmount *nmp, struct ucred *cred, struct nfsd_cargs *ncd,
989               int flag, caddr_t argp, struct thread *td)
990 {
991         struct nfsnode *np;
992         struct vnode *vp;
993         struct nfsreq myrep;
994         struct nfsuid *nuidp, *nnuidp;
995         int error = 0, vpid;
996
997         /*
998          * First initialize some variables
999          */
1000
1001         /*
1002          * If an authorization string is being passed in, get it.
1003          */
1004         if ((flag & NFSSVC_GOTAUTH) &&
1005             (nmp->nm_state & (NFSSTA_WAITAUTH | NFSSTA_DISMNT)) == 0) {
1006             if (nmp->nm_state & NFSSTA_HASAUTH)
1007                 panic("cld kerb");
1008             if ((flag & NFSSVC_AUTHINFAIL) == 0) {
1009                 if (ncd->ncd_authlen <= nmp->nm_authlen &&
1010                     ncd->ncd_verflen <= nmp->nm_verflen &&
1011                     !copyin(ncd->ncd_authstr,nmp->nm_authstr,ncd->ncd_authlen)&&
1012                     !copyin(ncd->ncd_verfstr,nmp->nm_verfstr,ncd->ncd_verflen)){
1013                     nmp->nm_authtype = ncd->ncd_authtype;
1014                     nmp->nm_authlen = ncd->ncd_authlen;
1015                     nmp->nm_verflen = ncd->ncd_verflen;
1016 #ifdef NFSKERB
1017                     nmp->nm_key = ncd->ncd_key;
1018 #endif
1019                 } else
1020                     nmp->nm_state |= NFSSTA_AUTHERR;
1021             } else
1022                 nmp->nm_state |= NFSSTA_AUTHERR;
1023             nmp->nm_state |= NFSSTA_HASAUTH;
1024             wakeup((caddr_t)&nmp->nm_authlen);
1025         } else
1026             nmp->nm_state |= NFSSTA_WAITAUTH;
1027
1028         /*
1029          * Loop every second updating queue until there is a termination sig.
1030          */
1031         while ((nmp->nm_state & NFSSTA_DISMNT) == 0) {
1032             if (nmp->nm_flag & NFSMNT_NQNFS) {
1033                 /*
1034                  * If there are no outstanding requests (and therefore no
1035                  * processes in nfs_reply) and there is data in the receive
1036                  * queue, poke for callbacks.
1037                  */
1038                 if (TAILQ_EMPTY(&nfs_reqq) && nmp->nm_so &&
1039                     nmp->nm_so->so_rcv.sb_cc > 0) {
1040                         myrep.r_flags = R_GETONEREP;
1041                         myrep.r_nmp = nmp;
1042                         myrep.r_mrep = (struct mbuf *)0;
1043                         myrep.r_td = NULL;
1044                         nfs_reply(&myrep);
1045                 }
1046
1047                 /*
1048                  * Loop through the leases, updating as required.
1049                  */
1050                 np = nmp->nm_timerhead.cqh_first;
1051                 while (np != (void *)&nmp->nm_timerhead &&
1052                        (nmp->nm_state & NFSSTA_DISMINPROG) == 0) {
1053                         vp = NFSTOV(np);
1054                         vpid = vp->v_id;
1055                         if (np->n_expiry < time_second) {
1056                            if (vget(vp, LK_EXCLUSIVE, td) == 0) {
1057                              nmp->nm_inprog = vp;
1058                              if (vpid == vp->v_id) {
1059                                 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer);
1060                                 np->n_timer.cqe_next = 0;
1061                                 if (np->n_flag & (NMODIFIED | NQNFSEVICTED)) {
1062                                         if (np->n_flag & NQNFSEVICTED) {
1063                                                 if (vp->v_type == VDIR)
1064                                                         nfs_invaldir(vp);
1065                                                 cache_inval_vp(vp, 0);
1066                                                 (void) nfs_vinvalbuf(vp,
1067                                                        V_SAVE, td, 0);
1068                                                 np->n_flag &= ~NQNFSEVICTED;
1069                                                 (void) nqnfs_vacated(vp, cred);
1070                                         } else if (vp->v_type == VREG) {
1071                                                 (void) VOP_FSYNC(vp, MNT_WAIT, td);
1072                                                 np->n_flag &= ~NMODIFIED;
1073                                         }
1074                                 }
1075                               }
1076                               vput(vp);
1077                               nmp->nm_inprog = NULLVP;
1078                             }
1079                         } else if ((np->n_expiry - NQ_RENEWAL) < time_second) {
1080                             if ((np->n_flag & (NQNFSWRITE | NQNFSNONCACHE))
1081                                  == NQNFSWRITE &&
1082                                  !TAILQ_EMPTY(&vp->v_dirtyblkhd) &&
1083                                  vget(vp, LK_EXCLUSIVE, td) == 0) {
1084                                  nmp->nm_inprog = vp;
1085                                  if (vpid == vp->v_id &&
1086                                      nqnfs_getlease(vp, ND_WRITE, td)==0)
1087                                         np->n_brev = np->n_lrev;
1088                                  vput(vp);
1089                                  nmp->nm_inprog = NULLVP;
1090                             }
1091                         } else
1092                                 break;
1093                         if (np == nmp->nm_timerhead.cqh_first)
1094                                 break;
1095                         np = nmp->nm_timerhead.cqh_first;
1096                 }
1097             }
1098
1099             /*
1100              * Get an authorization string, if required.
1101              */
1102             if ((nmp->nm_state & (NFSSTA_WAITAUTH | NFSSTA_DISMNT | NFSSTA_HASAUTH)) == 0) {
1103                 ncd->ncd_authuid = nmp->nm_authuid;
1104                 if (copyout((caddr_t)ncd, argp, sizeof (struct nfsd_cargs)))
1105                         nmp->nm_state |= NFSSTA_WAITAUTH;
1106                 else
1107                         return (ENEEDAUTH);
1108             }
1109
1110             /*
1111              * Wait a bit (no pun) and do it again.
1112              */
1113             if ((nmp->nm_state & NFSSTA_DISMNT) == 0 &&
1114                 (nmp->nm_state & (NFSSTA_WAITAUTH | NFSSTA_HASAUTH))) {
1115                     error = tsleep((caddr_t)&nmp->nm_authstr, PCATCH,
1116                         "nqnfstimr", hz / 3);
1117                     if (error == EINTR || error == ERESTART)
1118                         (void) dounmount(nmp->nm_mountp, 0, td);
1119             }
1120         }
1121
1122         /*
1123          * Finally, we can free up the mount structure.
1124          */
1125         TAILQ_FOREACH_MUTABLE(nuidp, &nmp->nm_uidlruhead, nu_lru, nnuidp) {
1126                 LIST_REMOVE(nuidp, nu_hash);
1127                 TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru);
1128                 free((caddr_t)nuidp, M_NFSUID);
1129         }
1130         nfs_free_mount(nmp);
1131         if (error == EWOULDBLOCK)
1132                 error = 0;
1133         return (error);
1134 }
1135
1136 #endif /* NFS_NOSERVER */
1137
1138 /*
1139  * Adjust all timer queue expiry times when the time of day clock is changed.
1140  * Called from the settimeofday() syscall.
1141  */
1142 void
1143 nqnfs_lease_updatetime(int deltat)
1144 {
1145         struct thread *td = curthread;  /* XXX */
1146         struct nqlease *lp;
1147         struct nfsnode *np;
1148         struct mount *mp, *nxtmp;
1149         struct nfsmount *nmp;
1150         lwkt_tokref ilock;
1151         int s;
1152
1153         if (nqnfsstarttime != 0)
1154                 nqnfsstarttime += deltat;
1155         s = splsoftclock();
1156         for (lp = nqtimerhead.cqh_first; lp != (void *)&nqtimerhead;
1157             lp = lp->lc_timer.cqe_next)
1158                 lp->lc_expiry += deltat;
1159         splx(s);
1160
1161         /*
1162          * Search the mount list for all nqnfs mounts and do their timer
1163          * queues.
1164          */
1165         lwkt_gettoken(&ilock, &mountlist_token);
1166         for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nxtmp) {
1167                 if (vfs_busy(mp, LK_NOWAIT, &ilock, td)) {
1168                         nxtmp = TAILQ_NEXT(mp, mnt_list);
1169                         continue;
1170                 }
1171                 if (mp->mnt_stat.f_type == nfs_mount_type) {
1172                         nmp = VFSTONFS(mp);
1173                         if (nmp->nm_flag & NFSMNT_NQNFS) {
1174                                 for (np = nmp->nm_timerhead.cqh_first;
1175                                     np != (void *)&nmp->nm_timerhead;
1176                                     np = np->n_timer.cqe_next) {
1177                                         np->n_expiry += deltat;
1178                                 }
1179                         }
1180                 }
1181                 lwkt_gettokref(&ilock);
1182                 nxtmp = TAILQ_NEXT(mp, mnt_list);
1183                 vfs_unbusy(mp, td);
1184         }
1185         lwkt_reltoken(&ilock);
1186 }
1187
1188 #ifndef NFS_NOSERVER 
1189 /*
1190  * Lock a server lease.
1191  */
1192 static void
1193 nqsrv_locklease(struct nqlease *lp)
1194 {
1195
1196         while (lp->lc_flag & LC_LOCKED) {
1197                 lp->lc_flag |= LC_WANTED;
1198                 (void) tsleep((caddr_t)lp, 0, "nqlc", 0);
1199         }
1200         lp->lc_flag |= LC_LOCKED;
1201         lp->lc_flag &= ~LC_WANTED;
1202 }
1203
1204 /*
1205  * Unlock a server lease.
1206  */
1207 static void
1208 nqsrv_unlocklease(struct nqlease *lp)
1209 {
1210
1211         lp->lc_flag &= ~LC_LOCKED;
1212         if (lp->lc_flag & LC_WANTED)
1213                 wakeup((caddr_t)lp);
1214 }
1215 #endif /* NFS_NOSERVER */
1216
1217 /*
1218  * Update a client lease.
1219  */
1220 void
1221 nqnfs_clientlease(struct nfsmount *nmp, struct nfsnode *np, int rwflag,
1222                   int cachable, time_t expiry, u_quad_t frev)
1223 {
1224         struct nfsnode *tp;
1225
1226         if (np->n_timer.cqe_next != 0) {
1227                 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer);
1228                 if (rwflag == ND_WRITE)
1229                         np->n_flag |= NQNFSWRITE;
1230         } else if (rwflag == ND_READ)
1231                 np->n_flag &= ~NQNFSWRITE;
1232         else
1233                 np->n_flag |= NQNFSWRITE;
1234         if (cachable)
1235                 np->n_flag &= ~NQNFSNONCACHE;
1236         else
1237                 np->n_flag |= NQNFSNONCACHE;
1238         np->n_expiry = expiry;
1239         np->n_lrev = frev;
1240         tp = nmp->nm_timerhead.cqh_last;
1241         while (tp != (void *)&nmp->nm_timerhead && tp->n_expiry > np->n_expiry)
1242                 tp = tp->n_timer.cqe_prev;
1243         if (tp == (void *)&nmp->nm_timerhead) {
1244                 CIRCLEQ_INSERT_HEAD(&nmp->nm_timerhead, np, n_timer);
1245         } else {
1246                 CIRCLEQ_INSERT_AFTER(&nmp->nm_timerhead, tp, np, n_timer);
1247         }
1248 }