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sys/nfs/nfs_nqlease.c
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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 8.3 (Berkeley) 1/4/94 37 * $FreeBSD: src/sys/nfs/nfs_nqlease.c,v 1.20.2.2 1999/12/12 07:25:10 dillon Exp $ 38 */ 39 40 /* 41 * References: 42 * Cary G. Gray and David R. Cheriton, "Leases: An Efficient Fault-Tolerant 43 * Mechanism for Distributed File Cache Consistency", 44 * In Proc. of the Twelfth ACM Symposium on Operating Systems 45 * Principals, pg. 202-210, Litchfield Park, AZ, Dec. 1989. 46 * Michael N. Nelson, Brent B. Welch and John K. Ousterhout, "Caching 47 * in the Sprite Network File System", ACM TOCS 6(1), 48 * pages 134-154, February 1988. 49 * V. Srinivasan and Jeffrey C. Mogul, "Spritely NFS: Implementation and 50 * Performance of Cache-Consistency Protocols", Digital 51 * Equipment Corporation WRL Research Report 89/5, May 1989. 52 */ 53 #include <sys/param.h> 54 #include <sys/vnode.h> 55 #include <sys/mount.h> 56 #include <sys/kernel.h> 57 #include <sys/proc.h> 58 #include <sys/systm.h> 59 #include <sys/mbuf.h> 60 #include <sys/socket.h> 61 #include <sys/socketvar.h> 62 #include <sys/file.h> 63 #include <sys/buf.h> 64 #include <sys/stat.h> 65 #include <sys/protosw.h> 66 67 #include <netinet/in.h> 68 #include <nfs/rpcv2.h> 69 #include <nfs/nfsproto.h> 70 #include <nfs/nfs.h> 71 #include <nfs/nfsm_subs.h> 72 #include <nfs/xdr_subs.h> 73 #include <nfs/nqnfs.h> 74 #include <nfs/nfsnode.h> 75 #include <nfs/nfsmount.h> 76 77 time_t nqnfsstarttime = (time_t)0; 78 int nqsrv_clockskew = NQ_CLOCKSKEW; 79 int nqsrv_writeslack = NQ_WRITESLACK; 80 int nqsrv_maxlease = NQ_MAXLEASE; 81 static int nqsrv_maxnumlease = NQ_MAXNUMLEASE; 82 83 struct vop_lease_args; 84 85 static int nqsrv_cmpnam __P((struct nfssvc_sock *,struct mbuf *, 86 struct nqhost *)); 87 extern void nqnfs_lease_check __P((struct vnode *vp, struct proc *p, 88 struct ucred *cred, int flag)); 89 extern void nqnfs_lease_updatetime __P((int deltat)); 90 static int nqnfs_vacated __P((struct vnode *vp, struct ucred *cred)); 91 extern int nqnfs_vop_lease_check __P((struct vop_lease_args *ap)); 92 static void nqsrv_addhost __P((struct nqhost *lph, struct nfssvc_sock *slp, 93 struct mbuf *nam)); 94 static void nqsrv_instimeq __P((struct nqlease *lp, u_long duration)); 95 static void nqsrv_locklease __P((struct nqlease *lp)); 96 static void nqsrv_send_eviction __P((struct vnode *vp, struct nqlease *lp, 97 struct nfssvc_sock *slp, 98 struct mbuf *nam, struct ucred *cred)); 99 static void nqsrv_unlocklease __P((struct nqlease *lp)); 100 static void nqsrv_waitfor_expiry __P((struct nqlease *lp)); 101 102 /* 103 * Signifies which rpcs can have piggybacked lease requests 104 */ 105 int nqnfs_piggy[NFS_NPROCS] = { 106 0, 107 0, 108 ND_WRITE, 109 ND_READ, 110 0, 111 ND_READ, 112 ND_READ, 113 ND_WRITE, 114 0, 115 0, 116 0, 117 0, 118 0, 119 0, 120 0, 121 0, 122 ND_READ, 123 ND_READ, 124 0, 125 0, 126 0, 127 0, 128 0, 129 0, 130 0, 131 0, 132 }; 133 134 extern nfstype nfsv2_type[9]; 135 extern nfstype nfsv3_type[9]; 136 extern struct nfssvc_sock *nfs_udpsock, *nfs_cltpsock; 137 extern int nfsd_waiting; 138 extern struct nfsstats nfsstats; 139 140 #define TRUE 1 141 #define FALSE 0 142 143 #ifndef NFS_NOSERVER 144 /* 145 * Get or check for a lease for "vp", based on ND_CHECK flag. 146 * The rules are as follows: 147 * - if a current non-caching lease, reply non-caching 148 * - if a current lease for same host only, extend lease 149 * - if a read cachable lease and a read lease request 150 * add host to list any reply cachable 151 * - else { set non-cachable for read-write sharing } 152 * send eviction notice messages to all other hosts that have lease 153 * wait for lease termination { either by receiving vacated messages 154 * from all the other hosts or expiry 155 * via. timeout } 156 * modify lease to non-cachable 157 * - else if no current lease, issue new one 158 * - reply 159 * - return boolean TRUE iff nam should be m_freem()'d 160 * NB: Since nqnfs_serverd() is called from a timer, any potential tsleep() 161 * in here must be framed by nqsrv_locklease() and nqsrv_unlocklease(). 162 * nqsrv_locklease() is coded such that at least one of LC_LOCKED and 163 * LC_WANTED is set whenever a process is tsleeping in it. The exception 164 * is when a new lease is being allocated, since it is not in the timer 165 * queue yet. (Ditto for the splsoftclock() and splx(s) calls) 166 */ 167 int 168 nqsrv_getlease(vp, duration, flags, slp, procp, nam, cachablep, frev, cred) 169 struct vnode *vp; 170 u_long *duration; 171 int flags; 172 struct nfssvc_sock *slp; 173 struct proc *procp; 174 struct mbuf *nam; 175 int *cachablep; 176 u_quad_t *frev; 177 struct ucred *cred; 178 { 179 register struct nqlease *lp; 180 register struct nqfhhashhead *lpp = 0; 181 register struct nqhost *lph = 0; 182 struct nqlease *tlp; 183 struct nqm **lphp; 184 struct vattr vattr; 185 fhandle_t fh; 186 int i, ok, error, s; 187 188 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) 189 return (0); 190 if (*duration > nqsrv_maxlease) 191 *duration = nqsrv_maxlease; 192 error = VOP_GETATTR(vp, &vattr, cred, procp); 193 if (error) 194 return (error); 195 *frev = vattr.va_filerev; 196 s = splsoftclock(); 197 tlp = vp->v_lease; 198 if ((flags & ND_CHECK) == 0) 199 nfsstats.srvnqnfs_getleases++; 200 if (tlp == (struct nqlease *)0) { 201 202 /* 203 * Find the lease by searching the hash list. 204 */ 205 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 206 error = VFS_VPTOFH(vp, &fh.fh_fid); 207 if (error) { 208 splx(s); 209 return (error); 210 } 211 lpp = NQFHHASH(fh.fh_fid.fid_data); 212 for (lp = lpp->lh_first; lp != 0; lp = lp->lc_hash.le_next) 213 if (fh.fh_fsid.val[0] == lp->lc_fsid.val[0] && 214 fh.fh_fsid.val[1] == lp->lc_fsid.val[1] && 215 !bcmp(fh.fh_fid.fid_data, lp->lc_fiddata, 216 fh.fh_fid.fid_len - sizeof (long))) { 217 /* Found it */ 218 lp->lc_vp = vp; 219 vp->v_lease = lp; 220 tlp = lp; 221 break; 222 } 223 } else 224 lp = tlp; 225 if (lp) { 226 if ((lp->lc_flag & LC_NONCACHABLE) || 227 (lp->lc_morehosts == (struct nqm *)0 && 228 nqsrv_cmpnam(slp, nam, &lp->lc_host))) 229 goto doreply; 230 if ((flags & ND_READ) && (lp->lc_flag & LC_WRITE) == 0) { 231 if (flags & ND_CHECK) 232 goto doreply; 233 if (nqsrv_cmpnam(slp, nam, &lp->lc_host)) 234 goto doreply; 235 i = 0; 236 if (lp->lc_morehosts) { 237 lph = lp->lc_morehosts->lpm_hosts; 238 lphp = &lp->lc_morehosts->lpm_next; 239 ok = 1; 240 } else { 241 lphp = &lp->lc_morehosts; 242 ok = 0; 243 } 244 while (ok && (lph->lph_flag & LC_VALID)) { 245 if (nqsrv_cmpnam(slp, nam, lph)) 246 goto doreply; 247 if (++i == LC_MOREHOSTSIZ) { 248 i = 0; 249 if (*lphp) { 250 lph = (*lphp)->lpm_hosts; 251 lphp = &((*lphp)->lpm_next); 252 } else 253 ok = 0; 254 } else 255 lph++; 256 } 257 nqsrv_locklease(lp); 258 if (!ok) { 259 *lphp = (struct nqm *) 260 malloc(sizeof (struct nqm), 261 M_NQMHOST, M_WAITOK); 262 bzero((caddr_t)*lphp, sizeof (struct nqm)); 263 lph = (*lphp)->lpm_hosts; 264 } 265 nqsrv_addhost(lph, slp, nam); 266 nqsrv_unlocklease(lp); 267 } else { 268 lp->lc_flag |= LC_NONCACHABLE; 269 nqsrv_locklease(lp); 270 nqsrv_send_eviction(vp, lp, slp, nam, cred); 271 nqsrv_waitfor_expiry(lp); 272 nqsrv_unlocklease(lp); 273 } 274 doreply: 275 /* 276 * Update the lease and return 277 */ 278 if ((flags & ND_CHECK) == 0) 279 nqsrv_instimeq(lp, *duration); 280 if (lp->lc_flag & LC_NONCACHABLE) 281 *cachablep = 0; 282 else { 283 *cachablep = 1; 284 if (flags & ND_WRITE) 285 lp->lc_flag |= LC_WRITTEN; 286 } 287 splx(s); 288 return (0); 289 } 290 splx(s); 291 if (flags & ND_CHECK) 292 return (0); 293 294 /* 295 * Allocate new lease 296 * The value of nqsrv_maxnumlease should be set generously, so that 297 * the following "printf" happens infrequently. 298 */ 299 if (nfsstats.srvnqnfs_leases > nqsrv_maxnumlease) { 300 printf("Nqnfs server, too many leases\n"); 301 do { 302 (void) tsleep((caddr_t)&lbolt, PSOCK, 303 "nqsrvnuml", 0); 304 } while (nfsstats.srvnqnfs_leases > nqsrv_maxnumlease); 305 } 306 MALLOC(lp, struct nqlease *, sizeof (struct nqlease), M_NQLEASE, M_WAITOK); 307 bzero((caddr_t)lp, sizeof (struct nqlease)); 308 if (flags & ND_WRITE) 309 lp->lc_flag |= (LC_WRITE | LC_WRITTEN); 310 nqsrv_addhost(&lp->lc_host, slp, nam); 311 lp->lc_vp = vp; 312 lp->lc_fsid = fh.fh_fsid; 313 bcopy(fh.fh_fid.fid_data, lp->lc_fiddata, 314 fh.fh_fid.fid_len - sizeof (long)); 315 if(!lpp) 316 panic("nfs_nqlease.c: Phoney lpp"); 317 LIST_INSERT_HEAD(lpp, lp, lc_hash); 318 vp->v_lease = lp; 319 s = splsoftclock(); 320 nqsrv_instimeq(lp, *duration); 321 splx(s); 322 *cachablep = 1; 323 if (++nfsstats.srvnqnfs_leases > nfsstats.srvnqnfs_maxleases) 324 nfsstats.srvnqnfs_maxleases = nfsstats.srvnqnfs_leases; 325 return (0); 326 } 327 328 /* 329 * Local lease check for server syscalls. 330 * Just set up args and let nqsrv_getlease() do the rest. 331 * nqnfs_vop_lease_check() is the VOP_LEASE() form of the same routine. 332 * Ifdef'd code in nfsnode.h renames these routines to whatever a particular 333 * OS needs. 334 */ 335 void 336 nqnfs_lease_check(vp, p, cred, flag) 337 struct vnode *vp; 338 struct proc *p; 339 struct ucred *cred; 340 int flag; 341 { 342 u_long duration = 0; 343 int cache; 344 u_quad_t frev; 345 346 (void) nqsrv_getlease(vp, &duration, ND_CHECK | flag, NQLOCALSLP, 347 p, (struct mbuf *)0, &cache, &frev, cred); 348 } 349 350 #endif /* NFS_NOSERVER */ 351 352 #ifdef HAS_VOPLEASE 353 int 354 nqnfs_vop_lease_check(ap) 355 struct vop_lease_args /* { 356 struct vnode *a_vp; 357 struct proc *a_p; 358 struct ucred *a_cred; 359 int a_flag; 360 } */ *ap; 361 { 362 u_long duration = 0; 363 int cache; 364 u_quad_t frev; 365 366 (void) nqsrv_getlease(ap->a_vp, &duration, ND_CHECK | ap->a_flag, 367 NQLOCALSLP, ap->a_p, (struct mbuf *)0, &cache, &frev, ap->a_cred); 368 return (0); 369 } 370 #endif 371 372 /* 373 * Add a host to an nqhost structure for a lease. 374 */ 375 static void 376 nqsrv_addhost(lph, slp, nam) 377 register struct nqhost *lph; 378 struct nfssvc_sock *slp; 379 struct mbuf *nam; 380 { 381 register struct sockaddr_in *saddr; 382 383 if (slp == NQLOCALSLP) 384 lph->lph_flag |= (LC_VALID | LC_LOCAL); 385 else if (slp == nfs_udpsock) { 386 saddr = mtod(nam, struct sockaddr_in *); 387 lph->lph_flag |= (LC_VALID | LC_UDP); 388 lph->lph_inetaddr = saddr->sin_addr.s_addr; 389 lph->lph_port = saddr->sin_port; 390 } else if (slp == nfs_cltpsock) { 391 lph->lph_nam = m_copym(nam, 0, M_COPYALL, M_WAIT); 392 lph->lph_flag |= (LC_VALID | LC_CLTP); 393 } else { 394 lph->lph_flag |= (LC_VALID | LC_SREF); 395 lph->lph_slp = slp; 396 slp->ns_sref++; 397 } 398 } 399 400 /* 401 * Update the lease expiry time and position it in the timer queue correctly. 402 */ 403 static void 404 nqsrv_instimeq(lp, duration) 405 register struct nqlease *lp; 406 u_long duration; 407 { 408 register struct nqlease *tlp; 409 time_t newexpiry; 410 411 newexpiry = time.tv_sec + 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 */ 442 static int 443 nqsrv_cmpnam(slp, nam, lph) 444 register struct nfssvc_sock *slp; 445 struct mbuf *nam; 446 register struct nqhost *lph; 447 { 448 register struct sockaddr_in *saddr; 449 struct mbuf *addr; 450 union nethostaddr lhaddr; 451 int ret; 452 453 if (slp == NQLOCALSLP) { 454 if (lph->lph_flag & LC_LOCAL) 455 return (1); 456 else 457 return (0); 458 } 459 if (slp == nfs_udpsock || slp == nfs_cltpsock) 460 addr = nam; 461 else 462 addr = slp->ns_nam; 463 if (lph->lph_flag & LC_UDP) 464 ret = netaddr_match(AF_INET, &lph->lph_haddr, addr); 465 else if (lph->lph_flag & LC_CLTP) 466 ret = netaddr_match(AF_ISO, &lph->lph_claddr, addr); 467 else { 468 if ((lph->lph_slp->ns_flag & SLP_VALID) == 0) 469 return (0); 470 saddr = mtod(lph->lph_slp->ns_nam, struct sockaddr_in *); 471 if (saddr->sin_family == AF_INET) 472 lhaddr.had_inetaddr = saddr->sin_addr.s_addr; 473 else 474 lhaddr.had_nam = lph->lph_slp->ns_nam; 475 ret = netaddr_match(saddr->sin_family, &lhaddr, addr); 476 } 477 return (ret); 478 } 479 480 /* 481 * Send out eviction notice messages to all other hosts for the lease. 482 */ 483 static void 484 nqsrv_send_eviction(vp, lp, slp, nam, cred) 485 struct vnode *vp; 486 register struct nqlease *lp; 487 struct nfssvc_sock *slp; 488 struct mbuf *nam; 489 struct ucred *cred; 490 { 491 register struct nqhost *lph = &lp->lc_host; 492 register struct mbuf *m; 493 register int siz; 494 struct nqm *lphnext = lp->lc_morehosts; 495 struct mbuf *mreq, *mb, *mb2, *nam2, *mheadend; 496 struct socket *so; 497 struct sockaddr_in *saddr; 498 fhandle_t *fhp; 499 caddr_t bpos, cp; 500 u_long xid; 501 int len = 1, ok = 1, i = 0; 502 int sotype, *solockp; 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 if (lph->lph_flag & LC_UDP) { 509 MGET(nam2, M_WAIT, MT_SONAME); 510 saddr = mtod(nam2, struct sockaddr_in *); 511 nam2->m_len = saddr->sin_len = 512 sizeof (struct sockaddr_in); 513 saddr->sin_family = AF_INET; 514 saddr->sin_addr.s_addr = lph->lph_inetaddr; 515 saddr->sin_port = lph->lph_port; 516 so = nfs_udpsock->ns_so; 517 } else if (lph->lph_flag & LC_CLTP) { 518 nam2 = lph->lph_nam; 519 so = nfs_cltpsock->ns_so; 520 } else if (lph->lph_slp->ns_flag & SLP_VALID) { 521 nam2 = (struct mbuf *)0; 522 so = lph->lph_slp->ns_so; 523 } else 524 goto nextone; 525 sotype = so->so_type; 526 if (so->so_proto->pr_flags & PR_CONNREQUIRED) 527 solockp = &lph->lph_slp->ns_solock; 528 else 529 solockp = (int *)0; 530 nfsm_reqhead((struct vnode *)0, NQNFSPROC_EVICTED, 531 NFSX_V3FH); 532 nfsm_build(cp, caddr_t, NFSX_V3FH); 533 bzero(cp, NFSX_V3FH); 534 fhp = (fhandle_t *)cp; 535 fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid; 536 VFS_VPTOFH(vp, &fhp->fh_fid); 537 m = mreq; 538 siz = 0; 539 while (m) { 540 siz += m->m_len; 541 m = m->m_next; 542 } 543 if (siz <= 0 || siz > NFS_MAXPACKET) { 544 printf("mbuf siz=%d\n",siz); 545 panic("Bad nfs svc reply"); 546 } 547 m = nfsm_rpchead(cred, (NFSMNT_NFSV3 | NFSMNT_NQNFS), 548 NQNFSPROC_EVICTED, 549 RPCAUTH_UNIX, 5 * NFSX_UNSIGNED, (char *)0, 550 0, (char *)NULL, mreq, siz, &mheadend, &xid); 551 /* 552 * For stream protocols, prepend a Sun RPC 553 * Record Mark. 554 */ 555 if (sotype == SOCK_STREAM) { 556 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 557 *mtod(m, u_long *) = htonl(0x80000000 | 558 (m->m_pkthdr.len - NFSX_UNSIGNED)); 559 } 560 if (((lph->lph_flag & (LC_UDP | LC_CLTP)) == 0 && 561 (lph->lph_slp->ns_flag & SLP_VALID) == 0) || 562 (solockp && (*solockp & NFSMNT_SNDLOCK))) 563 m_freem(m); 564 else { 565 if (solockp) 566 *solockp |= NFSMNT_SNDLOCK; 567 (void) nfs_send(so, nam2, m, 568 (struct nfsreq *)0); 569 if (solockp) 570 nfs_sndunlock(solockp); 571 } 572 if (lph->lph_flag & LC_UDP) 573 MFREE(nam2, m); 574 } 575 nextone: 576 if (++i == len) { 577 if (lphnext) { 578 i = 0; 579 len = LC_MOREHOSTSIZ; 580 lph = lphnext->lpm_hosts; 581 lphnext = lphnext->lpm_next; 582 } else 583 ok = 0; 584 } else 585 lph++; 586 } 587 } 588 589 /* 590 * Wait for the lease to expire. 591 * This will occur when all clients have sent "vacated" messages to 592 * this server OR when it expires do to timeout. 593 */ 594 static void 595 nqsrv_waitfor_expiry(lp) 596 register struct nqlease *lp; 597 { 598 register struct nqhost *lph; 599 register int i; 600 struct nqm *lphnext; 601 int len, ok; 602 603 tryagain: 604 if (time.tv_sec > lp->lc_expiry) 605 return; 606 lph = &lp->lc_host; 607 lphnext = lp->lc_morehosts; 608 len = 1; 609 i = 0; 610 ok = 1; 611 while (ok && (lph->lph_flag & LC_VALID)) { 612 if ((lph->lph_flag & (LC_LOCAL | LC_VACATED)) == 0) { 613 lp->lc_flag |= LC_EXPIREDWANTED; 614 (void) tsleep((caddr_t)&lp->lc_flag, PSOCK, 615 "nqexp", 0); 616 goto tryagain; 617 } 618 if (++i == len) { 619 if (lphnext) { 620 i = 0; 621 len = LC_MOREHOSTSIZ; 622 lph = lphnext->lpm_hosts; 623 lphnext = lphnext->lpm_next; 624 } else 625 ok = 0; 626 } else 627 lph++; 628 } 629 } 630 631 #ifndef NFS_NOSERVER 632 633 /* 634 * Nqnfs server timer that maintains the server lease queue. 635 * Scan the lease queue for expired entries: 636 * - when one is found, wakeup anyone waiting for it 637 * else dequeue and free 638 */ 639 void 640 nqnfs_serverd() 641 { 642 register struct nqlease *lp; 643 register struct nqhost *lph; 644 struct nqlease *nextlp; 645 struct nqm *lphnext, *olphnext; 646 struct mbuf *n; 647 int i, len, ok; 648 649 for (lp = nqtimerhead.cqh_first; lp != (void *)&nqtimerhead; 650 lp = nextlp) { 651 if (lp->lc_expiry >= time.tv_sec) 652 break; 653 nextlp = lp->lc_timer.cqe_next; 654 if (lp->lc_flag & LC_EXPIREDWANTED) { 655 lp->lc_flag &= ~LC_EXPIREDWANTED; 656 wakeup((caddr_t)&lp->lc_flag); 657 } else if ((lp->lc_flag & (LC_LOCKED | LC_WANTED)) == 0) { 658 /* 659 * Make a best effort at keeping a write caching lease long 660 * enough by not deleting it until it has been explicitly 661 * vacated or there have been no writes in the previous 662 * write_slack seconds since expiry and the nfsds are not 663 * all busy. The assumption is that if the nfsds are not 664 * all busy now (no queue of nfs requests), then the client 665 * would have been able to do at least one write to the 666 * file during the last write_slack seconds if it was still 667 * trying to push writes to the server. 668 */ 669 if ((lp->lc_flag & (LC_WRITE | LC_VACATED)) == LC_WRITE && 670 ((lp->lc_flag & LC_WRITTEN) || nfsd_waiting == 0)) { 671 lp->lc_flag &= ~LC_WRITTEN; 672 nqsrv_instimeq(lp, nqsrv_writeslack); 673 } else { 674 CIRCLEQ_REMOVE(&nqtimerhead, lp, lc_timer); 675 LIST_REMOVE(lp, lc_hash); 676 /* 677 * This soft reference may no longer be valid, but 678 * no harm done. The worst case is if the vnode was 679 * recycled and has another valid lease reference, 680 * which is dereferenced prematurely. 681 */ 682 lp->lc_vp->v_lease = (struct nqlease *)0; 683 lph = &lp->lc_host; 684 lphnext = lp->lc_morehosts; 685 olphnext = (struct nqm *)0; 686 len = 1; 687 i = 0; 688 ok = 1; 689 while (ok && (lph->lph_flag & LC_VALID)) { 690 if (lph->lph_flag & LC_CLTP) 691 MFREE(lph->lph_nam, n); 692 if (lph->lph_flag & LC_SREF) 693 nfsrv_slpderef(lph->lph_slp); 694 if (++i == len) { 695 if (olphnext) { 696 free((caddr_t)olphnext, M_NQMHOST); 697 olphnext = (struct nqm *)0; 698 } 699 if (lphnext) { 700 olphnext = lphnext; 701 i = 0; 702 len = LC_MOREHOSTSIZ; 703 lph = lphnext->lpm_hosts; 704 lphnext = lphnext->lpm_next; 705 } else 706 ok = 0; 707 } else 708 lph++; 709 } 710 FREE((caddr_t)lp, M_NQLEASE); 711 if (olphnext) 712 free((caddr_t)olphnext, M_NQMHOST); 713 nfsstats.srvnqnfs_leases--; 714 } 715 } 716 } 717 } 718 719 /* 720 * Called from nfssvc_nfsd() for a getlease rpc request. 721 * Do the from/to xdr translation and call nqsrv_getlease() to 722 * do the real work. 723 */ 724 int 725 nqnfsrv_getlease(nfsd, slp, procp, mrq) 726 struct nfsrv_descript *nfsd; 727 struct nfssvc_sock *slp; 728 struct proc *procp; 729 struct mbuf **mrq; 730 { 731 struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; 732 struct mbuf *nam = nfsd->nd_nam; 733 caddr_t dpos = nfsd->nd_dpos; 734 struct ucred *cred = &nfsd->nd_cr; 735 register struct nfs_fattr *fp; 736 struct vattr va; 737 register struct vattr *vap = &va; 738 struct vnode *vp; 739 nfsfh_t nfh; 740 fhandle_t *fhp; 741 register u_long *tl; 742 register long t1; 743 u_quad_t frev; 744 caddr_t bpos; 745 int error = 0; 746 char *cp2; 747 struct mbuf *mb, *mb2, *mreq; 748 int flags, rdonly, cache; 749 750 fhp = &nfh.fh_generic; 751 nfsm_srvmtofh(fhp); 752 nfsm_dissect(tl, u_long *, 2 * NFSX_UNSIGNED); 753 flags = fxdr_unsigned(int, *tl++); 754 nfsd->nd_duration = fxdr_unsigned(int, *tl); 755 error = nfsrv_fhtovp(fhp, 1, &vp, cred, slp, nam, &rdonly, 756 (nfsd->nd_flag & ND_KERBAUTH)); 757 if (error) { 758 nfsm_reply(0); 759 goto nfsmout; 760 } 761 if (rdonly && flags == ND_WRITE) { 762 error = EROFS; 763 vput(vp); 764 nfsm_reply(0); 765 } 766 (void) nqsrv_getlease(vp, &nfsd->nd_duration, flags, slp, procp, 767 nam, &cache, &frev, cred); 768 error = VOP_GETATTR(vp, vap, cred, procp); 769 vput(vp); 770 nfsm_reply(NFSX_V3FATTR + 4 * NFSX_UNSIGNED); 771 nfsm_build(tl, u_long *, 4 * NFSX_UNSIGNED); 772 *tl++ = txdr_unsigned(cache); 773 *tl++ = txdr_unsigned(nfsd->nd_duration); 774 txdr_hyper(&frev, tl); 775 nfsm_build(fp, struct nfs_fattr *, NFSX_V3FATTR); 776 nfsm_srvfillattr(vap, fp); 777 nfsm_srvdone; 778 } 779 780 /* 781 * Called from nfssvc_nfsd() when a "vacated" message is received from a 782 * client. Find the entry and expire it. 783 */ 784 int 785 nqnfsrv_vacated(nfsd, slp, procp, mrq) 786 struct nfsrv_descript *nfsd; 787 struct nfssvc_sock *slp; 788 struct proc *procp; 789 struct mbuf **mrq; 790 { 791 struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; 792 struct mbuf *nam = nfsd->nd_nam; 793 caddr_t dpos = nfsd->nd_dpos; 794 register struct nqlease *lp; 795 register struct nqhost *lph; 796 struct nqlease *tlp = (struct nqlease *)0; 797 nfsfh_t nfh; 798 fhandle_t *fhp; 799 register u_long *tl; 800 register long t1; 801 struct nqm *lphnext; 802 struct mbuf *mreq, *mb; 803 int error = 0, i, len, ok, gotit = 0, cache = 0; 804 char *cp2, *bpos; 805 u_quad_t frev; 806 807 fhp = &nfh.fh_generic; 808 nfsm_srvmtofh(fhp); 809 m_freem(mrep); 810 /* 811 * Find the lease by searching the hash list. 812 */ 813 for (lp = NQFHHASH(fhp->fh_fid.fid_data)->lh_first; lp != 0; 814 lp = lp->lc_hash.le_next) 815 if (fhp->fh_fsid.val[0] == lp->lc_fsid.val[0] && 816 fhp->fh_fsid.val[1] == lp->lc_fsid.val[1] && 817 !bcmp(fhp->fh_fid.fid_data, lp->lc_fiddata, 818 MAXFIDSZ)) { 819 /* Found it */ 820 tlp = lp; 821 break; 822 } 823 if (tlp) { 824 lp = tlp; 825 len = 1; 826 i = 0; 827 lph = &lp->lc_host; 828 lphnext = lp->lc_morehosts; 829 ok = 1; 830 while (ok && (lph->lph_flag & LC_VALID)) { 831 if (nqsrv_cmpnam(slp, nam, lph)) { 832 lph->lph_flag |= LC_VACATED; 833 gotit++; 834 break; 835 } 836 if (++i == len) { 837 if (lphnext) { 838 len = LC_MOREHOSTSIZ; 839 i = 0; 840 lph = lphnext->lpm_hosts; 841 lphnext = lphnext->lpm_next; 842 } else 843 ok = 0; 844 } else 845 lph++; 846 } 847 if ((lp->lc_flag & LC_EXPIREDWANTED) && gotit) { 848 lp->lc_flag &= ~LC_EXPIREDWANTED; 849 wakeup((caddr_t)&lp->lc_flag); 850 } 851 nfsmout: 852 return (EPERM); 853 } 854 return (EPERM); 855 } 856 857 #endif /* NFS_NOSERVER */ 858 859 /* 860 * Client get lease rpc function. 861 */ 862 int 863 nqnfs_getlease(vp, rwflag, cred, p) 864 register struct vnode *vp; 865 int rwflag; 866 struct ucred *cred; 867 struct proc *p; 868 { 869 register u_long *tl; 870 register caddr_t cp; 871 register long t1, t2; 872 register struct nfsnode *np; 873 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 874 caddr_t bpos, dpos, cp2; 875 time_t reqtime; 876 int error = 0; 877 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 878 int cachable; 879 u_quad_t frev; 880 881 nfsstats.rpccnt[NQNFSPROC_GETLEASE]++; 882 mb = mreq = nfsm_reqh(vp, NQNFSPROC_GETLEASE, NFSX_V3FH+2*NFSX_UNSIGNED, 883 &bpos); 884 nfsm_fhtom(vp, 1); 885 nfsm_build(tl, u_long *, 2 * NFSX_UNSIGNED); 886 *tl++ = txdr_unsigned(rwflag); 887 *tl = txdr_unsigned(nmp->nm_leaseterm); 888 reqtime = time.tv_sec; 889 nfsm_request(vp, NQNFSPROC_GETLEASE, p, cred); 890 np = VTONFS(vp); 891 nfsm_dissect(tl, u_long *, 4 * NFSX_UNSIGNED); 892 cachable = fxdr_unsigned(int, *tl++); 893 reqtime += fxdr_unsigned(int, *tl++); 894 if (reqtime > time.tv_sec) { 895 fxdr_hyper(tl, &frev); 896 nqnfs_clientlease(nmp, np, rwflag, cachable, reqtime, frev); 897 nfsm_loadattr(vp, (struct vattr *)0); 898 } else 899 error = NQNFS_EXPIRED; 900 nfsm_reqdone; 901 return (error); 902 } 903 904 /* 905 * Client vacated message function. 906 */ 907 static int 908 nqnfs_vacated(vp, cred) 909 register struct vnode *vp; 910 struct ucred *cred; 911 { 912 register caddr_t cp; 913 register struct mbuf *m; 914 register int i; 915 register u_long *tl; 916 register long t2; 917 caddr_t bpos; 918 u_long xid; 919 int error = 0; 920 struct mbuf *mreq, *mb, *mb2, *mheadend; 921 struct nfsmount *nmp; 922 struct nfsreq myrep; 923 924 nmp = VFSTONFS(vp->v_mount); 925 nfsstats.rpccnt[NQNFSPROC_VACATED]++; 926 nfsm_reqhead(vp, NQNFSPROC_VACATED, NFSX_V3FH); 927 nfsm_fhtom(vp, 1); 928 m = mreq; 929 i = 0; 930 while (m) { 931 i += m->m_len; 932 m = m->m_next; 933 } 934 m = nfsm_rpchead(cred, nmp->nm_flag, NQNFSPROC_VACATED, 935 RPCAUTH_UNIX, 5 * NFSX_UNSIGNED, (char *)0, 936 0, (char *)NULL, mreq, i, &mheadend, &xid); 937 if (nmp->nm_sotype == SOCK_STREAM) { 938 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 939 *mtod(m, u_long *) = htonl(0x80000000 | (m->m_pkthdr.len - 940 NFSX_UNSIGNED)); 941 } 942 myrep.r_flags = 0; 943 myrep.r_nmp = nmp; 944 if (nmp->nm_soflags & PR_CONNREQUIRED) 945 (void) nfs_sndlock(&nmp->nm_flag, (struct nfsreq *)0); 946 (void) nfs_send(nmp->nm_so, nmp->nm_nam, m, &myrep); 947 if (nmp->nm_soflags & PR_CONNREQUIRED) 948 nfs_sndunlock(&nmp->nm_flag); 949 nfsmout: 950 return (error); 951 } 952 953 #ifndef NFS_NOSERVER 954 955 /* 956 * Called for client side callbacks 957 */ 958 int 959 nqnfs_callback(nmp, mrep, md, dpos) 960 struct nfsmount *nmp; 961 struct mbuf *mrep, *md; 962 caddr_t dpos; 963 { 964 register struct vnode *vp; 965 register u_long *tl; 966 register long t1; 967 nfsfh_t nfh; 968 fhandle_t *fhp; 969 struct nfsnode *np; 970 struct nfsd tnfsd; 971 struct nfssvc_sock *slp; 972 struct nfsrv_descript ndesc; 973 register struct nfsrv_descript *nfsd = &ndesc; 974 struct mbuf **mrq = (struct mbuf **)0, *mb, *mreq; 975 int error = 0, cache = 0; 976 char *cp2, *bpos; 977 u_quad_t frev; 978 979 #ifndef nolint 980 slp = NULL; 981 #endif 982 nfsd->nd_mrep = mrep; 983 nfsd->nd_md = md; 984 nfsd->nd_dpos = dpos; 985 error = nfs_getreq(nfsd, &tnfsd, FALSE); 986 if (error) 987 return (error); 988 md = nfsd->nd_md; 989 dpos = nfsd->nd_dpos; 990 if (nfsd->nd_procnum != NQNFSPROC_EVICTED) { 991 m_freem(mrep); 992 return (EPERM); 993 } 994 fhp = &nfh.fh_generic; 995 nfsm_srvmtofh(fhp); 996 m_freem(mrep); 997 error = nfs_nget(nmp->nm_mountp, (nfsfh_t *)fhp, NFSX_V3FH, &np); 998 if (error) 999 return (error); 1000 vp = NFSTOV(np); 1001 if (np->n_timer.cqe_next != 0) { 1002 np->n_expiry = 0; 1003 np->n_flag |= NQNFSEVICTED; 1004 if (nmp->nm_timerhead.cqh_first != np) { 1005 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer); 1006 CIRCLEQ_INSERT_HEAD(&nmp->nm_timerhead, np, n_timer); 1007 } 1008 } 1009 vput(vp); 1010 nfsm_srvdone; 1011 } 1012 1013 1014 /* 1015 * Nqnfs client helper daemon. Runs once a second to expire leases. 1016 * It also get authorization strings for "kerb" mounts. 1017 * It must start at the beginning of the list again after any potential 1018 * "sleep" since nfs_reclaim() called from vclean() can pull a node off 1019 * the list asynchronously. 1020 */ 1021 int 1022 nqnfs_clientd(nmp, cred, ncd, flag, argp, p) 1023 register struct nfsmount *nmp; 1024 struct ucred *cred; 1025 struct nfsd_cargs *ncd; 1026 int flag; 1027 caddr_t argp; 1028 struct proc *p; 1029 { 1030 register struct nfsnode *np; 1031 struct vnode *vp; 1032 struct nfsreq myrep; 1033 struct nfsuid *nuidp, *nnuidp; 1034 int error = 0, vpid; 1035 1036 /* 1037 * First initialize some variables 1038 */ 1039 1040 /* 1041 * If an authorization string is being passed in, get it. 1042 */ 1043 if ((flag & NFSSVC_GOTAUTH) && 1044 (nmp->nm_flag & (NFSMNT_WAITAUTH | NFSMNT_DISMNT)) == 0) { 1045 if (nmp->nm_flag & NFSMNT_HASAUTH) 1046 panic("cld kerb"); 1047 if ((flag & NFSSVC_AUTHINFAIL) == 0) { 1048 if (ncd->ncd_authlen <= nmp->nm_authlen && 1049 ncd->ncd_verflen <= nmp->nm_verflen && 1050 !copyin(ncd->ncd_authstr,nmp->nm_authstr,ncd->ncd_authlen)&& 1051 !copyin(ncd->ncd_verfstr,nmp->nm_verfstr,ncd->ncd_verflen)){ 1052 nmp->nm_authtype = ncd->ncd_authtype; 1053 nmp->nm_authlen = ncd->ncd_authlen; 1054 nmp->nm_verflen = ncd->ncd_verflen; 1055 #ifdef NFSKERB 1056 nmp->nm_key = ncd->ncd_key; 1057 #endif 1058 } else 1059 nmp->nm_flag |= NFSMNT_AUTHERR; 1060 } else 1061 nmp->nm_flag |= NFSMNT_AUTHERR; 1062 nmp->nm_flag |= NFSMNT_HASAUTH; 1063 wakeup((caddr_t)&nmp->nm_authlen); 1064 } else 1065 nmp->nm_flag |= NFSMNT_WAITAUTH; 1066 1067 /* 1068 * Loop every second updating queue until there is a termination sig. 1069 */ 1070 while ((nmp->nm_flag & NFSMNT_DISMNT) == 0) { 1071 if (nmp->nm_flag & NFSMNT_NQNFS) { 1072 /* 1073 * If there are no outstanding requests (and therefore no 1074 * processes in nfs_reply) and there is data in the receive 1075 * queue, poke for callbacks. 1076 */ 1077 if (nfs_reqq.tqh_first == 0 && nmp->nm_so && 1078 nmp->nm_so->so_rcv.sb_cc > 0) { 1079 myrep.r_flags = R_GETONEREP; 1080 myrep.r_nmp = nmp; 1081 myrep.r_mrep = (struct mbuf *)0; 1082 myrep.r_procp = (struct proc *)0; 1083 (void) nfs_reply(&myrep); 1084 } 1085 1086 /* 1087 * Loop through the leases, updating as required. 1088 */ 1089 np = nmp->nm_timerhead.cqh_first; 1090 while (np != (void *)&nmp->nm_timerhead && 1091 (nmp->nm_flag & NFSMNT_DISMINPROG) == 0) { 1092 vp = NFSTOV(np); 1093 vpid = vp->v_id; 1094 if (np->n_expiry < time.tv_sec) { 1095 if (vget(vp, 1) == 0) { 1096 nmp->nm_inprog = vp; 1097 if (vpid == vp->v_id) { 1098 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer); 1099 np->n_timer.cqe_next = 0; 1100 if ((np->n_flag & (NMODIFIED | NQNFSEVICTED)) 1101 && vp->v_type == VREG) { 1102 if (np->n_flag & NQNFSEVICTED) { 1103 (void) nfs_vinvalbuf(vp, 1104 V_SAVE, cred, p, 0); 1105 np->n_flag &= ~NQNFSEVICTED; 1106 (void) nqnfs_vacated(vp, cred); 1107 } else { 1108 (void) VOP_FSYNC(vp, cred, 1109 MNT_WAIT, p); 1110 np->n_flag &= ~NMODIFIED; 1111 } 1112 } 1113 } 1114 vrele(vp); 1115 nmp->nm_inprog = NULLVP; 1116 } 1117 } else if ((np->n_expiry - NQ_RENEWAL) < time.tv_sec) { 1118 if ((np->n_flag & (NQNFSWRITE | NQNFSNONCACHE)) 1119 == NQNFSWRITE && vp->v_dirtyblkhd.lh_first && 1120 vget(vp, 1) == 0) { 1121 nmp->nm_inprog = vp; 1122 if (vpid == vp->v_id && 1123 nqnfs_getlease(vp, ND_WRITE, cred, p)==0) 1124 np->n_brev = np->n_lrev; 1125 vrele(vp); 1126 nmp->nm_inprog = NULLVP; 1127 } 1128 } else 1129 break; 1130 if (np == nmp->nm_timerhead.cqh_first) 1131 break; 1132 np = nmp->nm_timerhead.cqh_first; 1133 } 1134 } 1135 1136 /* 1137 * Get an authorization string, if required. 1138 */ 1139 if ((nmp->nm_flag & (NFSMNT_WAITAUTH | NFSMNT_DISMNT | NFSMNT_HASAUTH)) == 0) { 1140 ncd->ncd_authuid = nmp->nm_authuid; 1141 if (copyout((caddr_t)ncd, argp, sizeof (struct nfsd_cargs))) 1142 nmp->nm_flag |= NFSMNT_WAITAUTH; 1143 else 1144 return (ENEEDAUTH); 1145 } 1146 1147 /* 1148 * Wait a bit (no pun) and do it again. 1149 */ 1150 if ((nmp->nm_flag & NFSMNT_DISMNT) == 0 && 1151 (nmp->nm_flag & (NFSMNT_WAITAUTH | NFSMNT_HASAUTH))) { 1152 error = tsleep((caddr_t)&nmp->nm_authstr, PSOCK | PCATCH, 1153 "nqnfstimr", hz / 3); 1154 if (error == EINTR || error == ERESTART) 1155 (void) dounmount(nmp->nm_mountp, 0, p); 1156 } 1157 } 1158 1159 /* 1160 * Finally, we can free up the mount structure. 1161 */ 1162 for (nuidp = nmp->nm_uidlruhead.tqh_first; nuidp != 0; nuidp = nnuidp) { 1163 nnuidp = nuidp->nu_lru.tqe_next; 1164 LIST_REMOVE(nuidp, nu_hash); 1165 TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru); 1166 free((caddr_t)nuidp, M_NFSUID); 1167 } 1168 free((caddr_t)nmp, M_NFSMNT); 1169 if (error == EWOULDBLOCK) 1170 error = 0; 1171 return (error); 1172 } 1173 1174 #endif /* NFS_NOSERVER */ 1175 1176 /* 1177 * Adjust all timer queue expiry times when the time of day clock is changed. 1178 * Called from the settimeofday() syscall. 1179 */ 1180 void 1181 nqnfs_lease_updatetime(deltat) 1182 register int deltat; 1183 { 1184 register struct nqlease *lp; 1185 register struct nfsnode *np; 1186 struct mount *mp; 1187 struct nfsmount *nmp; 1188 int s; 1189 1190 if (nqnfsstarttime != 0) 1191 nqnfsstarttime += deltat; 1192 s = splsoftclock(); 1193 for (lp = nqtimerhead.cqh_first; lp != (void *)&nqtimerhead; 1194 lp = lp->lc_timer.cqe_next) 1195 lp->lc_expiry += deltat; 1196 splx(s); 1197 1198 /* 1199 * Search the mount list for all nqnfs mounts and do their timer 1200 * queues. 1201 */ 1202 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; 1203 mp = mp->mnt_list.cqe_next) { 1204 #ifdef __NetBSD__ 1205 if (!strcmp(&mp->mnt_stat.f_fstypename[0], MOUNT_NFS)) { 1206 #else 1207 if (mp->mnt_stat.f_fsid.val[1] == MOUNT_NFS) { 1208 #endif 1209 nmp = VFSTONFS(mp); 1210 if (nmp->nm_flag & NFSMNT_NQNFS) { 1211 for (np = nmp->nm_timerhead.cqh_first; 1212 np != (void *)&nmp->nm_timerhead; 1213 np = np->n_timer.cqe_next) { 1214 np->n_expiry += deltat; 1215 } 1216 } 1217 } 1218 } 1219 } 1220 1221 /* 1222 * Lock a server lease. 1223 */ 1224 static void 1225 nqsrv_locklease(lp) 1226 struct nqlease *lp; 1227 { 1228 1229 while (lp->lc_flag & LC_LOCKED) { 1230 lp->lc_flag |= LC_WANTED; 1231 (void) tsleep((caddr_t)lp, PSOCK, "nqlc", 0); 1232 } 1233 lp->lc_flag |= LC_LOCKED; 1234 lp->lc_flag &= ~LC_WANTED; 1235 } 1236 1237 /* 1238 * Unlock a server lease. 1239 */ 1240 static void 1241 nqsrv_unlocklease(lp) 1242 struct nqlease *lp; 1243 { 1244 1245 lp->lc_flag &= ~LC_LOCKED; 1246 if (lp->lc_flag & LC_WANTED) 1247 wakeup((caddr_t)lp); 1248 } 1249 1250 /* 1251 * Update a client lease. 1252 */ 1253 void 1254 nqnfs_clientlease(nmp, np, rwflag, cachable, expiry, frev) 1255 register struct nfsmount *nmp; 1256 register struct nfsnode *np; 1257 int rwflag, cachable; 1258 time_t expiry; 1259 u_quad_t frev; 1260 { 1261 register struct nfsnode *tp; 1262 1263 if (np->n_timer.cqe_next != 0) { 1264 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer); 1265 if (rwflag == ND_WRITE) 1266 np->n_flag |= NQNFSWRITE; 1267 } else if (rwflag == ND_READ) 1268 np->n_flag &= ~NQNFSWRITE; 1269 else 1270 np->n_flag |= NQNFSWRITE; 1271 if (cachable) 1272 np->n_flag &= ~NQNFSNONCACHE; 1273 else 1274 np->n_flag |= NQNFSNONCACHE; 1275 np->n_expiry = expiry; 1276 np->n_lrev = frev; 1277 tp = nmp->nm_timerhead.cqh_last; 1278 while (tp != (void *)&nmp->nm_timerhead && tp->n_expiry > np->n_expiry) 1279 tp = tp->n_timer.cqe_prev; 1280 if (tp == (void *)&nmp->nm_timerhead) { 1281 CIRCLEQ_INSERT_HEAD(&nmp->nm_timerhead, np, n_timer); 1282 } else { 1283 CIRCLEQ_INSERT_AFTER(&nmp->nm_timerhead, tp, np, n_timer); 1284 } 1285 }
Cache object: db3e24179f84b19d14ea6b86c7168b8b
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