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sys/nfs/nfs_nqlease.c
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1 /* $NetBSD: nfs_nqlease.c,v 1.74 2006/11/09 09:53:57 yamt Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)nfs_nqlease.c 8.9 (Berkeley) 5/20/95 35 */ 36 37 /* 38 * References: 39 * Cary G. Gray and David R. Cheriton, "Leases: An Efficient Fault-Tolerant 40 * Mechanism for Distributed File Cache Consistency", 41 * In Proc. of the Twelfth ACM Symposium on Operating Systems 42 * Principals, pg. 202-210, Litchfield Park, AZ, Dec. 1989. 43 * Michael N. Nelson, Brent B. Welch and John K. Ousterhout, "Caching 44 * in the Sprite Network File System", ACM TOCS 6(1), 45 * pages 134-154, February 1988. 46 * V. Srinivasan and Jeffrey C. Mogul, "Spritely NFS: Implementation and 47 * Performance of Cache-Consistency Protocols", Digital 48 * Equipment Corporation WRL Research Report 89/5, May 1989. 49 */ 50 51 #include <sys/cdefs.h> 52 __KERNEL_RCSID(0, "$NetBSD: nfs_nqlease.c,v 1.74 2006/11/09 09:53:57 yamt Exp $"); 53 54 #include "fs_nfs.h" 55 #include "opt_nfs.h" 56 #include "opt_nfsserver.h" 57 #include "opt_inet.h" 58 59 #include <sys/param.h> 60 #include <sys/vnode.h> 61 #include <sys/mount.h> 62 #include <sys/kernel.h> 63 #include <sys/namei.h> 64 #include <sys/proc.h> 65 #include <sys/systm.h> 66 #include <sys/mbuf.h> 67 #include <sys/socket.h> 68 #include <sys/socketvar.h> 69 #include <sys/file.h> 70 #include <sys/buf.h> 71 #include <sys/stat.h> 72 #include <sys/protosw.h> 73 #include <sys/signalvar.h> 74 #include <sys/kauth.h> 75 76 #include <miscfs/syncfs/syncfs.h> 77 78 #include <netinet/in.h> 79 #include <nfs/rpcv2.h> 80 #include <nfs/nfsproto.h> 81 #include <nfs/nfs.h> 82 #include <nfs/nfsm_subs.h> 83 #include <nfs/xdr_subs.h> 84 #include <nfs/nqnfs.h> 85 #include <nfs/nfsnode.h> 86 #include <nfs/nfsmount.h> 87 #include <nfs/nfs_var.h> 88 89 time_t nqnfsstarttime = (time_t)0; 90 int nqsrv_clockskew = NQ_CLOCKSKEW; 91 int nqsrv_writeslack = NQ_WRITESLACK; 92 int nqsrv_maxlease = NQ_MAXLEASE; 93 int nqsrv_maxnumlease = NQ_MAXNUMLEASE; 94 95 struct nqleasehead nqtimerhead; 96 struct nqfhhashhead *nqfhhashtbl; 97 u_long nqfhhash; 98 99 MALLOC_DEFINE(M_NQLEASE, "NQNFS Lease", "Nqnfs lease"); 100 MALLOC_DEFINE(M_NQMHOST, "NQNFS Host", "Nqnfs host address table"); 101 102 /* 103 * Signifies which rpcs can have piggybacked lease requests 104 */ 105 const 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 const nfstype nfsv2_type[9]; 135 extern const nfstype nfsv3_type[9]; 136 extern struct nfssvc_sock *nfs_udpsock; 137 #ifdef ISO 138 extern struct nfssvc_sock *nfs_cltpsock 139 #endif 140 #ifdef INET6 141 extern struct nfssvc_sock *nfs_udp6sock; 142 #endif 143 extern int nfsd_waiting; 144 extern struct nfsstats nfsstats; 145 146 147 #if defined(NFSSERVER) 148 /* 149 * Get or check for a lease for "vp", based on ND_CHECK flag. 150 * The rules are as follows: 151 * - if a current non-caching lease, reply non-caching 152 * - if a current lease for same host only, extend lease 153 * - if a read cachable lease and a read lease request 154 * add host to list any reply cachable 155 * - else { set non-cachable for read-write sharing } 156 * send eviction notice messages to all other hosts that have lease 157 * wait for lease termination { either by receiving vacated messages 158 * from all the other hosts or expiry 159 * via. timeout } 160 * modify lease to non-cachable 161 * - else if no current lease, issue new one 162 * - reply 163 * - return boolean TRUE iff nam should be m_freem()'d 164 * NB: Since nqnfs_serverd() is called from a timer, any potential tsleep() 165 * in here must be framed by nqsrv_locklease() and nqsrv_unlocklease(). 166 * nqsrv_locklease() is coded such that at least one of LC_LOCKED and 167 * LC_WANTED is set whenever a process is tsleeping in it. The exception 168 * is when a new lease is being allocated, since it is not in the timer 169 * queue yet. (Ditto for the splsoftnet() and splx(s) calls) 170 */ 171 int 172 nqsrv_getlease(vp, duration, flags, slp, lwp, nam, cachablep, frev, cred) 173 struct vnode *vp; 174 u_int32_t *duration; 175 int flags; 176 struct nfssvc_sock *slp; 177 struct lwp *lwp; 178 struct mbuf *nam; 179 int *cachablep; 180 u_quad_t *frev; 181 kauth_cred_t cred; 182 { 183 struct nqlease *lp; 184 struct nqfhhashhead *lpp = NULL; 185 struct nqhost *lph = NULL; 186 struct nqlease *tlp; 187 struct nqm **lphp; 188 struct vattr vattr; 189 nfsrvfh_t nsfh; 190 int i, ok, error, s; 191 192 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) 193 return (0); 194 195 nfs_init(); 196 197 if (*duration > nqsrv_maxlease) 198 *duration = nqsrv_maxlease; 199 error = VOP_GETATTR(vp, &vattr, cred, lwp); 200 if (error) 201 return (error); 202 *frev = vattr.va_filerev; 203 s = splsoftnet(); 204 tlp = vp->v_lease; 205 if ((flags & ND_CHECK) == 0) 206 nfsstats.srvnqnfs_getleases++; 207 if (tlp == 0) { 208 /* 209 * Find the lease by searching the hash list. 210 */ 211 error = nfsrv_composefh(vp, &nsfh, TRUE); 212 if (error) { 213 splx(s); 214 return (error); 215 } 216 lpp = NQFHHASH(NFSRVFH_FHANDLE(&nsfh)->fh_fid.fid_data); 217 LIST_FOREACH (lp, lpp, lc_hash) { 218 if (!nfsrv_comparefh(&lp->lc_fh, &nsfh)) { 219 /* Found it */ 220 lp->lc_vp = vp; 221 vp->v_lease = lp; 222 tlp = lp; 223 break; 224 } 225 } 226 } else 227 lp = tlp; 228 if (lp != 0) { 229 if ((lp->lc_flag & LC_NONCACHABLE) || 230 (lp->lc_morehosts == (struct nqm *)0 && 231 nqsrv_cmpnam(slp, nam, &lp->lc_host))) 232 goto doreply; 233 if ((flags & ND_READ) && (lp->lc_flag & LC_WRITE) == 0) { 234 if (flags & ND_CHECK) 235 goto doreply; 236 if (nqsrv_cmpnam(slp, nam, &lp->lc_host)) 237 goto doreply; 238 i = 0; 239 if (lp->lc_morehosts) { 240 lph = lp->lc_morehosts->lpm_hosts; 241 lphp = &lp->lc_morehosts->lpm_next; 242 ok = 1; 243 } else { 244 lphp = &lp->lc_morehosts; 245 ok = 0; 246 } 247 while (ok && (lph->lph_flag & LC_VALID)) { 248 if (nqsrv_cmpnam(slp, nam, lph)) 249 goto doreply; 250 if (++i == LC_MOREHOSTSIZ) { 251 i = 0; 252 if (*lphp) { 253 lph = (*lphp)->lpm_hosts; 254 lphp = &((*lphp)->lpm_next); 255 } else 256 ok = 0; 257 } else 258 lph++; 259 } 260 nqsrv_locklease(lp); 261 if (!ok) { 262 *lphp = (struct nqm *) 263 malloc(sizeof (struct nqm), 264 M_NQMHOST, M_WAITOK); 265 memset((caddr_t)*lphp, 0, sizeof (struct nqm)); 266 lph = (*lphp)->lpm_hosts; 267 } 268 nqsrv_addhost(lph, slp, nam); 269 nqsrv_unlocklease(lp); 270 } else { 271 lp->lc_flag |= LC_NONCACHABLE; 272 nqsrv_locklease(lp); 273 nqsrv_send_eviction(vp, lp, slp, nam, cred, lwp); 274 nqsrv_waitfor_expiry(lp); 275 nqsrv_unlocklease(lp); 276 } 277 doreply: 278 /* 279 * Update the lease and return 280 */ 281 if ((flags & ND_CHECK) == 0) 282 nqsrv_instimeq(lp, *duration); 283 if (lp->lc_flag & LC_NONCACHABLE) 284 *cachablep = 0; 285 else { 286 *cachablep = 1; 287 if (flags & ND_WRITE) 288 lp->lc_flag |= LC_WRITTEN; 289 } 290 splx(s); 291 return (0); 292 } 293 splx(s); 294 if (flags & ND_CHECK) { 295 return (0); 296 } 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 memset((caddr_t)lp, 0, 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 nfsrv_copyfh(&lp->lc_fh, &nsfh); 317 if(!lpp) 318 panic("nfs_nqlease.c: Phoney lpp"); 319 LIST_INSERT_HEAD(lpp, lp, lc_hash); 320 vp->v_lease = lp; 321 s = splsoftnet(); 322 nqsrv_instimeq(lp, *duration); 323 splx(s); 324 *cachablep = 1; 325 if (++nfsstats.srvnqnfs_leases > nfsstats.srvnqnfs_maxleases) 326 nfsstats.srvnqnfs_maxleases = nfsstats.srvnqnfs_leases; 327 return (0); 328 } 329 330 /* 331 * Add a host to an nqhost structure for a lease. 332 */ 333 void 334 nqsrv_addhost(lph, slp, nam) 335 struct nqhost *lph; 336 struct nfssvc_sock *slp; 337 struct mbuf *nam; 338 { 339 struct sockaddr_in *saddr; 340 341 if (slp == NQLOCALSLP) 342 lph->lph_flag |= (LC_VALID | LC_LOCAL); 343 else if (slp == nfs_udpsock) { 344 saddr = mtod(nam, struct sockaddr_in *); 345 lph->lph_flag |= (LC_VALID | LC_UDP); 346 lph->lph_inetaddr = saddr->sin_addr.s_addr; 347 lph->lph_port = saddr->sin_port; 348 #ifdef INET6 349 } else if (slp == nfs_udp6sock) { 350 lph->lph_nam = m_copym(nam, 0, M_COPYALL, M_WAIT); 351 lph->lph_flag |= (LC_VALID | LC_UDP6); 352 #endif 353 #ifdef ISO 354 } else if (slp == nfs_cltpsock) { 355 lph->lph_nam = m_copym(nam, 0, M_COPYALL, M_WAIT); 356 lph->lph_flag |= (LC_VALID | LC_CLTP); 357 #endif 358 } else { 359 lph->lph_flag |= (LC_VALID | LC_SREF); 360 lph->lph_slp = slp; 361 slp->ns_sref++; 362 } 363 } 364 365 /* 366 * Update the lease expiry time and position it in the timer queue correctly. 367 */ 368 void 369 nqsrv_instimeq(lp, duration) 370 struct nqlease *lp; 371 u_int32_t duration; 372 { 373 struct nqlease *tlp; 374 time_t newexpiry; 375 376 newexpiry = time_second + duration + nqsrv_clockskew; 377 if (lp->lc_expiry == newexpiry) 378 return; 379 if (CIRCLEQ_NEXT(lp, lc_timer) != 0) 380 CIRCLEQ_REMOVE(&nqtimerhead, lp, lc_timer); 381 lp->lc_expiry = newexpiry; 382 383 /* 384 * Find where in the queue it should be. 385 */ 386 tlp = CIRCLEQ_LAST(&nqtimerhead); 387 while (tlp != (void *)&nqtimerhead && tlp->lc_expiry > newexpiry) 388 tlp = CIRCLEQ_PREV(tlp, lc_timer); 389 #ifdef HASNVRAM 390 if (tlp == CIRCLEQ_LAST(&nqtimerhead)) 391 NQSTORENOVRAM(newexpiry); 392 #endif /* HASNVRAM */ 393 if (tlp == (void *)&nqtimerhead) { 394 CIRCLEQ_INSERT_HEAD(&nqtimerhead, lp, lc_timer); 395 } else { 396 CIRCLEQ_INSERT_AFTER(&nqtimerhead, tlp, lp, lc_timer); 397 } 398 } 399 400 /* 401 * Compare the requesting host address with the lph entry in the lease. 402 * Return true iff it is the same. 403 * This is somewhat messy due to the union in the nqhost structure. 404 * The local host is indicated by the special value of NQLOCALSLP for slp. 405 */ 406 int 407 nqsrv_cmpnam(slp, nam, lph) 408 struct nfssvc_sock *slp; 409 struct mbuf *nam; 410 struct nqhost *lph; 411 { 412 struct sockaddr_in *saddr; 413 struct mbuf *addr; 414 union nethostaddr lhaddr; 415 int ret; 416 417 if (slp == NQLOCALSLP) { 418 if (lph->lph_flag & LC_LOCAL) 419 return (1); 420 else 421 return (0); 422 } 423 if (slp == nfs_udpsock 424 #ifdef ISO 425 || slp == nfs_cltpsock 426 #endif 427 #ifdef INET6 428 || slp == nfs_udp6sock 429 #endif 430 ) 431 addr = nam; 432 else 433 addr = slp->ns_nam; 434 if (lph->lph_flag & LC_UDP) 435 ret = netaddr_match(AF_INET, &lph->lph_haddr, addr); 436 else if (lph->lph_flag & LC_CLTP) 437 ret = netaddr_match(AF_ISO, &lph->lph_claddr, addr); 438 else { 439 if ((lph->lph_slp->ns_flag & SLP_VALID) == 0) 440 return (0); 441 saddr = mtod(lph->lph_slp->ns_nam, struct sockaddr_in *); 442 if (saddr->sin_family == AF_INET) 443 lhaddr.had_inetaddr = saddr->sin_addr.s_addr; 444 else 445 lhaddr.had_nam = lph->lph_slp->ns_nam; 446 ret = netaddr_match(saddr->sin_family, &lhaddr, addr); 447 } 448 return (ret); 449 } 450 451 /* 452 * Send out eviction notice messages to all other hosts for the lease. 453 */ 454 void 455 nqsrv_send_eviction(vp, lp, slp, nam, cred, l) 456 struct vnode *vp; 457 struct nqlease *lp; 458 struct nfssvc_sock *slp; 459 struct mbuf *nam; 460 kauth_cred_t cred; 461 struct lwp *l; 462 { 463 struct nqhost *lph = &lp->lc_host; 464 struct mbuf *m; 465 int siz; 466 struct nqm *lphnext = lp->lc_morehosts; 467 struct mbuf *mreq, *mb, *nam2, *mheadend; 468 struct socket *so; 469 struct sockaddr_in *saddr; 470 nfsrvfh_t nsfh; 471 caddr_t bpos, cp; 472 u_int32_t xid, *tl; 473 int len = 1, ok = 1, i = 0; 474 int sotype, *solockp; 475 476 while (ok && (lph->lph_flag & LC_VALID)) { 477 if (nqsrv_cmpnam(slp, nam, lph)) 478 lph->lph_flag |= LC_VACATED; 479 else if ((lph->lph_flag & (LC_LOCAL | LC_VACATED)) == 0) { 480 int error; 481 482 if (lph->lph_flag & LC_UDP) { 483 nam2 = m_get(M_WAIT, MT_SONAME); 484 MCLAIM(nam2, &nfs_mowner); 485 saddr = mtod(nam2, struct sockaddr_in *); 486 nam2->m_len = saddr->sin_len = 487 sizeof (struct sockaddr_in); 488 saddr->sin_family = AF_INET; 489 saddr->sin_addr.s_addr = lph->lph_inetaddr; 490 saddr->sin_port = lph->lph_port; 491 so = nfs_udpsock->ns_so; 492 #ifdef ISO 493 } else if (lph->lph_flag & LC_CLTP) { 494 nam2 = lph->lph_nam; 495 so = nfs_cltpsock->ns_so; 496 #endif 497 #ifdef INET6 498 } else if (lph->lph_flag & LC_UDP6) { 499 nam2 = lph->lph_nam; 500 so = nfs_udp6sock->ns_so; 501 #endif 502 } else if (lph->lph_slp->ns_flag & SLP_VALID) { 503 nam2 = (struct mbuf *)0; 504 so = lph->lph_slp->ns_so; 505 } else 506 goto nextone; 507 if (!so) 508 goto nextone; 509 sotype = so->so_type; 510 if (so->so_proto->pr_flags & PR_CONNREQUIRED) 511 solockp = &lph->lph_slp->ns_solock; 512 else 513 solockp = (int *)0; 514 nfsm_reqhead((struct nfsnode *)0, NQNFSPROC_EVICTED, 515 NFSX_V3FH + NFSX_UNSIGNED); 516 error = nfsrv_composefh(vp, &nsfh, 1); 517 KASSERT(error == 0); /* XXX */ 518 nfsm_srvfhtom(&nsfh, 1); 519 m = mreq; 520 siz = 0; 521 while (m) { 522 siz += m->m_len; 523 m = m->m_next; 524 } 525 if (siz <= 0 || siz > NFS_MAXPACKET) { 526 printf("mbuf siz=%d\n",siz); 527 panic("Bad nfs svc reply"); 528 } 529 m = nfsm_rpchead(cred, (NFSMNT_NFSV3 | NFSMNT_NQNFS), 530 NQNFSPROC_EVICTED, 531 RPCAUTH_UNIX, 5 * NFSX_UNSIGNED, (char *)0, 532 0, (char *)0, mreq, siz, &mheadend, &xid); 533 /* 534 * For stream protocols, prepend a Sun RPC 535 * Record Mark. 536 */ 537 if (sotype == SOCK_STREAM) { 538 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 539 *mtod(m, u_int32_t *) = htonl(0x80000000 | 540 (m->m_pkthdr.len - NFSX_UNSIGNED)); 541 } 542 if (((lph->lph_flag & (LC_UDP | LC_CLTP | LC_UDP6)) 543 == 0 && 544 (lph->lph_slp->ns_flag & SLP_VALID) == 0) || 545 (solockp && (*solockp & NFSMNT_SNDLOCK))) 546 m_freem(m); 547 else { 548 if (solockp) 549 *solockp |= NFSMNT_SNDLOCK; 550 (void) nfs_send(so, nam2, m, 551 (struct nfsreq *)0, l); 552 if (solockp) 553 nfs_sndunlock(solockp); 554 } 555 if (lph->lph_flag & LC_UDP) 556 (void) m_free(nam2); 557 } 558 nextone: 559 if (++i == len) { 560 if (lphnext) { 561 i = 0; 562 len = LC_MOREHOSTSIZ; 563 lph = lphnext->lpm_hosts; 564 lphnext = lphnext->lpm_next; 565 } else 566 ok = 0; 567 } else 568 lph++; 569 } 570 } 571 572 /* 573 * Wait for the lease to expire. 574 * This will occur when all clients have sent "vacated" messages to 575 * this server OR when it expires do to timeout. 576 */ 577 void 578 nqsrv_waitfor_expiry(lp) 579 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, PSOCK, 598 "nqexp", 0); 599 goto tryagain; 600 } 601 if (++i == len) { 602 if (lphnext) { 603 i = 0; 604 len = LC_MOREHOSTSIZ; 605 lph = lphnext->lpm_hosts; 606 lphnext = lphnext->lpm_next; 607 } else 608 ok = 0; 609 } else 610 lph++; 611 } 612 } 613 614 /* 615 * Nqnfs server timer that maintains the server lease queue. 616 * Scan the lease queue for expired entries: 617 * - when one is found, wakeup anyone waiting for it 618 * else dequeue and free 619 */ 620 void 621 nqnfs_serverd() 622 { 623 struct nqlease *lp; 624 struct nqhost *lph; 625 struct nqlease *nextlp; 626 struct nqm *lphnext, *olphnext; 627 int i, len, ok; 628 629 for (lp = CIRCLEQ_FIRST(&nqtimerhead); lp != (void *)&nqtimerhead; 630 lp = nextlp) { 631 if (lp->lc_expiry >= time_second) 632 break; 633 nextlp = CIRCLEQ_NEXT(lp, lc_timer); 634 if (lp->lc_flag & LC_EXPIREDWANTED) { 635 lp->lc_flag &= ~LC_EXPIREDWANTED; 636 wakeup((caddr_t)&lp->lc_flag); 637 } else if ((lp->lc_flag & (LC_LOCKED | LC_WANTED)) == 0) { 638 /* 639 * Make a best effort at keeping a write caching lease long 640 * enough by not deleting it until it has been explicitly 641 * vacated or there have been no writes in the previous 642 * write_slack seconds since expiry and the nfsds are not 643 * all busy. The assumption is that if the nfsds are not 644 * all busy now (no queue of nfs requests), then the client 645 * would have been able to do at least one write to the 646 * file during the last write_slack seconds if it was still 647 * trying to push writes to the server. 648 */ 649 if ((lp->lc_flag & (LC_WRITE | LC_VACATED)) == LC_WRITE && 650 ((lp->lc_flag & LC_WRITTEN) || nfsd_waiting == 0)) { 651 lp->lc_flag &= ~LC_WRITTEN; 652 nqsrv_instimeq(lp, nqsrv_writeslack); 653 } else { 654 CIRCLEQ_REMOVE(&nqtimerhead, lp, lc_timer); 655 LIST_REMOVE(lp, lc_hash); 656 /* 657 * This soft reference may no longer be valid, but 658 * no harm done. The worst case is if the vnode was 659 * recycled and has another valid lease reference, 660 * which is dereferenced prematurely. 661 */ 662 lp->lc_vp->v_lease = (struct nqlease *)0; 663 lph = &lp->lc_host; 664 lphnext = lp->lc_morehosts; 665 olphnext = (struct nqm *)0; 666 len = 1; 667 i = 0; 668 ok = 1; 669 while (ok && (lph->lph_flag & LC_VALID)) { 670 if (lph->lph_flag & (LC_CLTP | LC_UDP6)) 671 (void) m_free(lph->lph_nam); 672 if (lph->lph_flag & LC_SREF) 673 nfsrv_slpderef(lph->lph_slp); 674 if (++i == len) { 675 if (olphnext) { 676 free((caddr_t)olphnext, M_NQMHOST); 677 olphnext = (struct nqm *)0; 678 } 679 if (lphnext) { 680 olphnext = lphnext; 681 i = 0; 682 len = LC_MOREHOSTSIZ; 683 lph = lphnext->lpm_hosts; 684 lphnext = lphnext->lpm_next; 685 } else 686 ok = 0; 687 } else 688 lph++; 689 } 690 FREE((caddr_t)lp, M_NQLEASE); 691 if (olphnext) 692 free((caddr_t)olphnext, M_NQMHOST); 693 nfsstats.srvnqnfs_leases--; 694 } 695 } 696 } 697 } 698 699 /* 700 * Called from nfssvc_nfsd() for a getlease rpc request. 701 * Do the from/to xdr translation and call nqsrv_getlease() to 702 * do the real work. 703 */ 704 int 705 nqnfsrv_getlease(nfsd, slp, lwp, mrq) 706 struct nfsrv_descript *nfsd; 707 struct nfssvc_sock *slp; 708 struct lwp *lwp; 709 struct mbuf **mrq; 710 { 711 struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; 712 struct mbuf *nam = nfsd->nd_nam; 713 caddr_t dpos = nfsd->nd_dpos; 714 kauth_cred_t cred = nfsd->nd_cr; 715 struct nfs_fattr *fp; 716 struct vattr va; 717 struct vnode *vp; 718 nfsrvfh_t nsfh; 719 u_int32_t *tl; 720 int32_t t1; 721 u_quad_t frev; 722 caddr_t bpos; 723 int error = 0; 724 char *cp2; 725 struct mbuf *mb, *mreq; 726 int flags, rdonly, cache = 0; 727 728 nfsm_srvmtofh(&nsfh); 729 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 730 flags = fxdr_unsigned(int, *tl++); 731 nfsd->nd_duration = fxdr_unsigned(int, *tl); 732 error = nfsrv_fhtovp(&nsfh, 1, &vp, cred, slp, nam, &rdonly, 733 (nfsd->nd_flag & ND_KERBAUTH), FALSE); 734 if (error) { 735 nfsm_reply(0); 736 return 0; 737 } 738 if (rdonly && flags == ND_WRITE) { 739 vput(vp); 740 error = EROFS; 741 nfsm_reply(0); 742 return 0; 743 } 744 (void) nqsrv_getlease(vp, &nfsd->nd_duration, flags, slp, lwp, 745 nam, &cache, &frev, cred); 746 error = VOP_GETATTR(vp, &va, cred, lwp); 747 vput(vp); 748 nfsm_reply(NFSX_V3FATTR + 4 * NFSX_UNSIGNED); 749 nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED); 750 *tl++ = txdr_unsigned(cache); 751 *tl++ = txdr_unsigned(nfsd->nd_duration); 752 txdr_hyper(frev, tl); 753 nfsm_build(fp, struct nfs_fattr *, NFSX_V3FATTR); 754 nfsm_srvfillattr(&va, fp); 755 nfsm_srvdone; 756 } 757 758 /* 759 * Called from nfssvc_nfsd() when a "vacated" message is received from a 760 * client. Find the entry and expire it. 761 */ 762 int 763 nqnfsrv_vacated(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, 764 struct lwp *lwp, struct mbuf **mrq) 765 { 766 struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; 767 struct mbuf *nam = nfsd->nd_nam; 768 caddr_t dpos = nfsd->nd_dpos; 769 struct nqlease *lp; 770 struct nqhost *lph; 771 struct nqlease *tlp = (struct nqlease *)0; 772 nfsrvfh_t nsfh; 773 fhandle_t *fhp; 774 u_int32_t *tl; 775 int32_t t1; 776 struct nqm *lphnext; 777 struct mbuf *mreq, *mb; 778 int error = 0, i, len, ok, gotit = 0, cache = 0; 779 char *cp2, *bpos; 780 u_quad_t frev; 781 782 nfsm_srvmtofh(&nsfh); 783 m_freem(mrep); 784 fhp = &nsfh.nsfh_u.u_fh; 785 /* 786 * Find the lease by searching the hash list. 787 */ 788 LIST_FOREACH(lp, NQFHHASH(fhp->fh_fid.fid_data), lc_hash) { 789 if (!nfsrv_comparefh(&lp->lc_fh, &nsfh)) { 790 /* Found it */ 791 tlp = lp; 792 break; 793 } 794 } 795 if (tlp != 0) { 796 lp = tlp; 797 len = 1; 798 i = 0; 799 lph = &lp->lc_host; 800 lphnext = lp->lc_morehosts; 801 ok = 1; 802 while (ok && (lph->lph_flag & LC_VALID)) { 803 if (nqsrv_cmpnam(slp, nam, lph)) { 804 lph->lph_flag |= LC_VACATED; 805 gotit++; 806 break; 807 } 808 if (++i == len) { 809 if (lphnext) { 810 len = LC_MOREHOSTSIZ; 811 i = 0; 812 lph = lphnext->lpm_hosts; 813 lphnext = lphnext->lpm_next; 814 } else 815 ok = 0; 816 } else 817 lph++; 818 } 819 if ((lp->lc_flag & LC_EXPIREDWANTED) && gotit) { 820 lp->lc_flag &= ~LC_EXPIREDWANTED; 821 wakeup((caddr_t)&lp->lc_flag); 822 } 823 nfsmout: 824 return (EPERM); 825 } 826 return (EPERM); 827 } 828 #endif /* NFSSERVER */ 829 830 #if defined(NFS) && !defined(NFS_V2_ONLY) 831 /* 832 * Client get lease rpc function. 833 */ 834 int 835 nqnfs_getlease(vp, rwflag, cred, l) 836 struct vnode *vp; 837 int rwflag; 838 kauth_cred_t cred; 839 struct lwp *l; 840 { 841 u_int32_t *tl; 842 caddr_t cp; 843 int32_t t1, t2; 844 struct nfsnode *np; 845 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 846 caddr_t bpos, dpos, cp2; 847 time_t reqtime; 848 int error = 0; 849 struct mbuf *mreq, *mrep, *md, *mb; 850 int cachable; 851 u_quad_t frev; 852 853 nfsstats.rpccnt[NQNFSPROC_GETLEASE]++; 854 np = VTONFS(vp); 855 mb = mreq = nfsm_reqh(np, NQNFSPROC_GETLEASE, NFSX_V3FH+2*NFSX_UNSIGNED, 856 &bpos); 857 nfsm_fhtom(np, 1); 858 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 859 *tl++ = txdr_unsigned(rwflag); 860 *tl = txdr_unsigned(nmp->nm_leaseterm); 861 reqtime = time_second; 862 nfsm_request(np, NQNFSPROC_GETLEASE, l, cred); 863 nfsm_dissect(tl, u_int32_t *, 4 * NFSX_UNSIGNED); 864 cachable = fxdr_unsigned(int, *tl++); 865 reqtime += fxdr_unsigned(int, *tl++); 866 if (reqtime > time_second) { 867 frev = fxdr_hyper(tl); 868 nqnfs_clientlease(nmp, np, rwflag, cachable, reqtime, frev); 869 nfsm_loadattr(vp, (struct vattr *)0, 0); 870 } else 871 error = NQNFS_EXPIRED; 872 nfsm_reqdone; 873 return (error); 874 } 875 876 /* 877 * Client vacated message function. 878 */ 879 int 880 nqnfs_vacated(vp, cred, l) 881 struct vnode *vp; 882 kauth_cred_t cred; 883 struct lwp *l; 884 { 885 caddr_t cp; 886 struct mbuf *m; 887 int i; 888 u_int32_t *tl; 889 int32_t t2; 890 caddr_t bpos; 891 u_int32_t xid; 892 int error = 0; 893 struct mbuf *mreq, *mb, *mheadend; 894 struct nfsmount *nmp; 895 struct nfsreq myrep; 896 struct nfsnode *np = VTONFS(vp); 897 898 nmp = VFSTONFS(vp->v_mount); 899 nfsstats.rpccnt[NQNFSPROC_VACATED]++; 900 nfsm_reqhead(np, NQNFSPROC_VACATED, NFSX_FH(1)); 901 nfsm_fhtom(np, 1); 902 m = mreq; 903 i = 0; 904 while (m) { 905 i += m->m_len; 906 m = m->m_next; 907 } 908 m = nfsm_rpchead(cred, nmp->nm_flag, NQNFSPROC_VACATED, 909 RPCAUTH_UNIX, 5 * NFSX_UNSIGNED, (char *)0, 910 0, (char *)0, mreq, i, &mheadend, &xid); 911 if (nmp->nm_sotype == SOCK_STREAM) { 912 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 913 *mtod(m, u_int32_t *) = htonl(0x80000000 | (m->m_pkthdr.len - 914 NFSX_UNSIGNED)); 915 } 916 myrep.r_flags = 0; 917 myrep.r_nmp = nmp; 918 if (nmp->nm_soflags & PR_CONNREQUIRED) 919 (void) nfs_sndlock(&nmp->nm_iflag, (struct nfsreq *)0); 920 (void) nfs_send(nmp->nm_so, nmp->nm_nam, m, &myrep, l); 921 if (nmp->nm_soflags & PR_CONNREQUIRED) 922 nfs_sndunlock(&nmp->nm_iflag); 923 nfsmout: 924 return (error); 925 } 926 927 /* 928 * Called for client side callbacks 929 */ 930 static int 931 nqnfs_callback1(struct nfsmount *nmp, struct mbuf *mrep, struct mbuf *md, 932 caddr_t dpos, struct lwp *l, struct nfsrv_descript *nfsd) 933 { 934 struct vnode *vp; 935 u_int32_t *tl; 936 int32_t t1; 937 nfsrvfh_t nsfh; 938 fhandle_t *fhp; 939 struct nfsnode *np; 940 struct nfsd tnfsd; 941 struct nfssvc_sock *slp; 942 struct mbuf **mrq = (struct mbuf **)0, *mb, *mreq; 943 int error = 0, cache = 0; 944 char *cp2, *bpos; 945 u_quad_t frev; 946 947 #ifndef nolint 948 slp = NULL; 949 #endif 950 nfsd->nd_mrep = mrep; 951 nfsd->nd_md = md; 952 nfsd->nd_dpos = dpos; 953 error = nfs_getreq(nfsd, &tnfsd, FALSE); 954 if (error) 955 return (error); 956 md = nfsd->nd_md; 957 dpos = nfsd->nd_dpos; 958 if (nfsd->nd_procnum != NQNFSPROC_EVICTED) { 959 m_freem(mrep); 960 return (EPERM); 961 } 962 nfsm_srvmtofh(&nsfh); 963 m_freem(mrep); 964 fhp = &nsfh.nsfh_u.u_fh; 965 error = nfs_nget(nmp->nm_mountp, (nfsfh_t *)fhp, NFSX_V3FH, &np); 966 if (error) 967 return (error); 968 vp = NFSTOV(np); 969 if (CIRCLEQ_NEXT(np, n_timer) != 0) { 970 np->n_expiry = 0; 971 np->n_flag |= NQNFSEVICTED; 972 if (CIRCLEQ_FIRST(&nmp->nm_timerhead) != np) { 973 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer); 974 CIRCLEQ_INSERT_HEAD(&nmp->nm_timerhead, np, n_timer); 975 } 976 } 977 vput(vp); 978 kauth_cred_free(nfsd->nd_cr); 979 nfsm_srvdone; 980 } 981 982 int 983 nqnfs_callback(struct nfsmount *nmp, struct mbuf *mrep, struct mbuf *md, 984 caddr_t dpos, struct lwp *l) 985 { 986 struct nfsrv_descript *nd; 987 int error; 988 989 nd = nfsdreq_alloc(); 990 error = nqnfs_callback1(nmp, mrep, md, dpos, l, nd); 991 nfsdreq_free(nd); 992 993 return error; 994 } 995 #endif /* NFS && !NFS_V2_ONLY */ 996 997 #ifdef NFS /* Needed in V2_ONLY case for Kerberos stuff */ 998 /* 999 * Nqnfs client helper daemon. Runs once a second to expire leases. 1000 * It also get authorization strings for "kerb" mounts. 1001 * It must start at the beginning of the list again after any potential 1002 * "sleep" since nfs_reclaim() called from vclean() can pull a node off 1003 * the list asynchronously. 1004 */ 1005 int 1006 nqnfs_clientd(struct nfsmount *nmp, kauth_cred_t cred, struct nfsd_cargs *ncd, 1007 int flag, caddr_t argp, struct lwp *l) 1008 { 1009 #ifndef NFS_V2_ONLY 1010 struct nfsnode *np; 1011 struct vnode *vp; 1012 struct nfsreq myrep; 1013 #endif 1014 int error = 0, sleepreturn; 1015 struct nfsuid *nuidp, *nnuidp; 1016 1017 /* 1018 * First initialize some variables 1019 */ 1020 1021 /* 1022 * If an authorization string is being passed in, get it. 1023 */ 1024 if ((flag & NFSSVC_GOTAUTH) && 1025 (nmp->nm_iflag & (NFSMNT_WAITAUTH | NFSMNT_DISMNT)) == 0) { 1026 if (nmp->nm_iflag & NFSMNT_HASAUTH) 1027 panic("cld kerb"); 1028 if ((flag & NFSSVC_AUTHINFAIL) == 0) { 1029 if (ncd->ncd_authlen <= nmp->nm_authlen && 1030 ncd->ncd_verflen <= nmp->nm_verflen && 1031 !copyin(ncd->ncd_authstr,nmp->nm_authstr,ncd->ncd_authlen)&& 1032 !copyin(ncd->ncd_verfstr,nmp->nm_verfstr,ncd->ncd_verflen)){ 1033 nmp->nm_authtype = ncd->ncd_authtype; 1034 nmp->nm_authlen = ncd->ncd_authlen; 1035 nmp->nm_verflen = ncd->ncd_verflen; 1036 #ifdef NFSKERB 1037 nmp->nm_key = ncd->ncd_key; 1038 #endif 1039 } else 1040 nmp->nm_iflag |= NFSMNT_AUTHERR; 1041 } else 1042 nmp->nm_iflag |= NFSMNT_AUTHERR; 1043 nmp->nm_iflag |= NFSMNT_HASAUTH; 1044 wakeup((caddr_t)&nmp->nm_authlen); 1045 } else 1046 nmp->nm_iflag |= NFSMNT_WAITAUTH; 1047 1048 /* 1049 * Loop every second updating queue until there is a termination sig. 1050 */ 1051 sleepreturn = 0; 1052 while ((nmp->nm_iflag & NFSMNT_DISMNT) == 0) { 1053 if (sleepreturn == EINTR || sleepreturn == ERESTART) { 1054 /* 1055 * XXX Freeze syncer. Must do this before locking 1056 * the mount point. See dounmount() for details. 1057 */ 1058 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 1059 if (vfs_busy(nmp->nm_mountp, LK_NOWAIT, 0) != 0) 1060 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 1061 else if (dounmount(nmp->nm_mountp, 0, l) != 0) 1062 CLRSIG(l); 1063 sleepreturn = 0; 1064 continue; 1065 } 1066 #ifndef NFS_V2_ONLY 1067 if (nmp->nm_flag & NFSMNT_NQNFS) { 1068 /* 1069 * If there are no outstanding requests (and therefore no 1070 * processes in nfs_reply) and there is data in the receive 1071 * queue, poke for callbacks. 1072 */ 1073 if (TAILQ_EMPTY(&nfs_reqq) && nmp->nm_so && 1074 nmp->nm_so->so_rcv.sb_cc > 0) { 1075 myrep.r_flags = R_GETONEREP; 1076 myrep.r_nmp = nmp; 1077 myrep.r_mrep = (struct mbuf *)0; 1078 myrep.r_lwp = (struct lwp *)0; 1079 (void) nfs_reply(&myrep, l); 1080 } 1081 1082 /* 1083 * Loop through the leases, updating as required. 1084 */ 1085 np = CIRCLEQ_FIRST(&nmp->nm_timerhead); 1086 while (np != (void *)&nmp->nm_timerhead && 1087 (nmp->nm_iflag & NFSMNT_DISMINPROG) == 0) { 1088 vp = NFSTOV(np); 1089 if (np->n_expiry < time_second) { 1090 if (vget(vp, LK_EXCLUSIVE) == 0) { 1091 nmp->nm_inprog = vp; 1092 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer); 1093 /* mark this off the list */ 1094 CIRCLEQ_NEXT(np, n_timer) = 0; /* XXX */ 1095 if (np->n_flag & (NMODIFIED | NQNFSEVICTED)) { 1096 if (np->n_flag & NQNFSEVICTED) { 1097 if (vp->v_type == VDIR) 1098 nfs_invaldircache(vp,0); 1099 cache_purge(vp); 1100 (void) nfs_vinvalbuf(vp, 1101 V_SAVE, cred, l, 0); 1102 np->n_flag &= ~NQNFSEVICTED; 1103 (void) nqnfs_vacated(vp, cred, l); 1104 } else if (vp->v_type == VREG) { 1105 (void) VOP_FSYNC(vp, cred, 1106 FSYNC_WAIT, 0, 0, l); 1107 np->n_flag &= ~NMODIFIED; 1108 } 1109 } 1110 vput(vp); 1111 nmp->nm_inprog = NULLVP; 1112 } 1113 } else if ((np->n_expiry - NQ_RENEWAL) < time_second) { 1114 if ((np->n_flag & (NQNFSWRITE | NQNFSNONCACHE)) 1115 == NQNFSWRITE && 1116 !LIST_EMPTY(&vp->v_dirtyblkhd) && 1117 vget(vp, LK_EXCLUSIVE) == 0) { 1118 nmp->nm_inprog = vp; 1119 if (nqnfs_getlease(vp, ND_WRITE, cred, l)==0) 1120 np->n_brev = np->n_lrev; 1121 vput(vp); 1122 nmp->nm_inprog = NULLVP; 1123 } 1124 } else 1125 break; 1126 if (np == CIRCLEQ_FIRST(&nmp->nm_timerhead)) 1127 break; 1128 np = CIRCLEQ_FIRST(&nmp->nm_timerhead); 1129 } 1130 } 1131 #endif /* !NFS_V2_ONLY */ 1132 1133 /* 1134 * Get an authorization string, if required. 1135 */ 1136 if ((nmp->nm_iflag & (NFSMNT_WAITAUTH | NFSMNT_DISMNT | NFSMNT_HASAUTH)) == 0) { 1137 ncd->ncd_authuid = nmp->nm_authuid; 1138 if (copyout((caddr_t)ncd, argp, sizeof (struct nfsd_cargs))) 1139 nmp->nm_iflag |= NFSMNT_WAITAUTH; 1140 else 1141 return (ENEEDAUTH); 1142 } 1143 1144 /* 1145 * Wait a bit (no pun) and do it again. 1146 */ 1147 if ((nmp->nm_iflag & NFSMNT_DISMNT) == 0 && 1148 (nmp->nm_iflag & (NFSMNT_WAITAUTH | NFSMNT_HASAUTH))) { 1149 sleepreturn = tsleep((caddr_t)&nmp->nm_authstr, 1150 PSOCK | PCATCH, "nqnfstimr", hz / 3); 1151 } 1152 } 1153 1154 /* 1155 * Finally, we can free up the mount structure. 1156 */ 1157 for (nuidp = TAILQ_FIRST(&nmp->nm_uidlruhead); nuidp != 0; 1158 nuidp = nnuidp) { 1159 nnuidp = TAILQ_NEXT(nuidp, nu_lru); 1160 LIST_REMOVE(nuidp, nu_hash); 1161 TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru); 1162 free((caddr_t)nuidp, M_NFSUID); 1163 } 1164 free((caddr_t)nmp, M_NFSMNT); 1165 return (error); 1166 } 1167 #endif /* NFS */ 1168 1169 #if defined(NFS) && !defined(NFS_V2_ONLY) 1170 /* 1171 * Update a client lease. 1172 */ 1173 void 1174 nqnfs_clientlease(nmp, np, rwflag, cachable, expiry, frev) 1175 struct nfsmount *nmp; 1176 struct nfsnode *np; 1177 int rwflag, cachable; 1178 time_t expiry; 1179 u_quad_t frev; 1180 { 1181 struct nfsnode *tp; 1182 1183 if (CIRCLEQ_NEXT(np, n_timer) != 0) { 1184 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer); 1185 if (rwflag == ND_WRITE) 1186 np->n_flag |= NQNFSWRITE; 1187 } else if (rwflag == ND_READ) 1188 np->n_flag &= ~NQNFSWRITE; 1189 else 1190 np->n_flag |= NQNFSWRITE; 1191 if (cachable) 1192 np->n_flag &= ~NQNFSNONCACHE; 1193 else 1194 np->n_flag |= NQNFSNONCACHE; 1195 np->n_expiry = expiry; 1196 np->n_lrev = frev; 1197 tp = nmp->nm_timerhead.cqh_last; 1198 while (tp != (void *)&nmp->nm_timerhead && tp->n_expiry > np->n_expiry) 1199 tp = tp->n_timer.cqe_prev; 1200 if (tp == (void *)&nmp->nm_timerhead) { 1201 CIRCLEQ_INSERT_HEAD(&nmp->nm_timerhead, np, n_timer); 1202 } else { 1203 CIRCLEQ_INSERT_AFTER(&nmp->nm_timerhead, tp, np, n_timer); 1204 } 1205 } 1206 #endif /* NFS && !NFS_V2_ONLY */ 1207 1208 #if defined(NFSSERVER) || (defined(NFS) && !defined(NFS_V2_ONLY)) 1209 /* 1210 * Adjust all timer queue expiry times when the time of day clock is changed. 1211 * Called from the settimeofday() syscall. 1212 */ 1213 void 1214 nqnfs_lease_updatetime(deltat) 1215 int deltat; 1216 { 1217 struct nqlease *lp; 1218 struct nfsnode *np; 1219 struct mount *mp; 1220 struct nfsmount *nmp; 1221 int s; 1222 struct mount *nxtmp; 1223 1224 if (nqnfsstarttime != 0) 1225 nqnfsstarttime += deltat; 1226 s = splsoftnet(); 1227 CIRCLEQ_FOREACH(lp, &nqtimerhead, lc_timer) { 1228 lp->lc_expiry += deltat; 1229 } 1230 splx(s); 1231 1232 /* 1233 * Search the mount list for all nqnfs mounts and do their timer 1234 * queues. 1235 */ 1236 simple_lock(&mountlist_slock); 1237 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 1238 mp = nxtmp) { 1239 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 1240 nxtmp = CIRCLEQ_NEXT(mp, mnt_list); 1241 continue; 1242 } 1243 if (!strncmp(&mp->mnt_stat.f_fstypename[0], MOUNT_NFS, 1244 MFSNAMELEN)) { 1245 nmp = VFSTONFS(mp); 1246 if (nmp->nm_flag & NFSMNT_NQNFS) { 1247 CIRCLEQ_FOREACH(np, &nmp->nm_timerhead, 1248 n_timer) { 1249 np->n_expiry += deltat; 1250 } 1251 } 1252 } 1253 simple_lock(&mountlist_slock); 1254 nxtmp = CIRCLEQ_NEXT(mp, mnt_list); 1255 vfs_unbusy(mp); 1256 } 1257 simple_unlock(&mountlist_slock); 1258 } 1259 1260 /* 1261 * Lock a server lease. 1262 */ 1263 void 1264 nqsrv_locklease(lp) 1265 struct nqlease *lp; 1266 { 1267 1268 while (lp->lc_flag & LC_LOCKED) { 1269 lp->lc_flag |= LC_WANTED; 1270 (void) tsleep((caddr_t)lp, PSOCK, "nqlc", 0); 1271 } 1272 lp->lc_flag |= LC_LOCKED; 1273 lp->lc_flag &= ~LC_WANTED; 1274 } 1275 1276 /* 1277 * Unlock a server lease. 1278 */ 1279 void 1280 nqsrv_unlocklease(lp) 1281 struct nqlease *lp; 1282 { 1283 1284 lp->lc_flag &= ~LC_LOCKED; 1285 if (lp->lc_flag & LC_WANTED) 1286 wakeup((caddr_t)lp); 1287 } 1288 #endif /* NFSSERVER || NFS && !NFS_V2_ONLY */
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