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sys/nfs/nfs_nqlease.c
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1 /* $NetBSD: nfs_nqlease.c,v 1.53 2003/08/07 16:33:50 agc 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 1.53 2003/08/07 16:33:50 agc 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 75 #include <miscfs/syncfs/syncfs.h> 76 77 #include <netinet/in.h> 78 #include <nfs/rpcv2.h> 79 #include <nfs/nfsproto.h> 80 #include <nfs/nfs.h> 81 #include <nfs/nfsm_subs.h> 82 #include <nfs/xdr_subs.h> 83 #include <nfs/nqnfs.h> 84 #include <nfs/nfsnode.h> 85 #include <nfs/nfsmount.h> 86 #include <nfs/nfs_var.h> 87 88 time_t nqnfsstarttime = (time_t)0; 89 int nqsrv_clockskew = NQ_CLOCKSKEW; 90 int nqsrv_writeslack = NQ_WRITESLACK; 91 int nqsrv_maxlease = NQ_MAXLEASE; 92 int nqsrv_maxnumlease = NQ_MAXNUMLEASE; 93 94 struct nqleasehead nqtimerhead; 95 struct nqfhhashhead *nqfhhashtbl; 96 u_long nqfhhash; 97 98 MALLOC_DEFINE(M_NQLEASE, "NQNFS Lease", "Nqnfs lease"); 99 MALLOC_DEFINE(M_NQMHOST, "NQNFS Host", "Nqnfs host address table"); 100 101 /* 102 * Signifies which rpcs can have piggybacked lease requests 103 */ 104 const int nqnfs_piggy[NFS_NPROCS] = { 105 0, 106 0, 107 ND_WRITE, 108 ND_READ, 109 0, 110 ND_READ, 111 ND_READ, 112 ND_WRITE, 113 0, 114 0, 115 0, 116 0, 117 0, 118 0, 119 0, 120 0, 121 ND_READ, 122 ND_READ, 123 0, 124 0, 125 0, 126 0, 127 0, 128 0, 129 0, 130 0, 131 }; 132 133 extern const nfstype nfsv2_type[9]; 134 extern const nfstype nfsv3_type[9]; 135 extern struct nfssvc_sock *nfs_udpsock; 136 #ifdef ISO 137 extern struct nfssvc_sock *nfs_cltpsock 138 #endif 139 #ifdef INET6 140 extern struct nfssvc_sock *nfs_udp6sock; 141 #endif 142 extern int nfsd_waiting; 143 extern struct nfsstats nfsstats; 144 145 146 #if defined(NFSSERVER) || (defined(NFS) && !defined(NFS_V2_ONLY)) 147 /* 148 * Get or check for a lease for "vp", based on ND_CHECK flag. 149 * The rules are as follows: 150 * - if a current non-caching lease, reply non-caching 151 * - if a current lease for same host only, extend lease 152 * - if a read cachable lease and a read lease request 153 * add host to list any reply cachable 154 * - else { set non-cachable for read-write sharing } 155 * send eviction notice messages to all other hosts that have lease 156 * wait for lease termination { either by receiving vacated messages 157 * from all the other hosts or expiry 158 * via. timeout } 159 * modify lease to non-cachable 160 * - else if no current lease, issue new one 161 * - reply 162 * - return boolean TRUE iff nam should be m_freem()'d 163 * NB: Since nqnfs_serverd() is called from a timer, any potential tsleep() 164 * in here must be framed by nqsrv_locklease() and nqsrv_unlocklease(). 165 * nqsrv_locklease() is coded such that at least one of LC_LOCKED and 166 * LC_WANTED is set whenever a process is tsleeping in it. The exception 167 * is when a new lease is being allocated, since it is not in the timer 168 * queue yet. (Ditto for the splsoftnet() and splx(s) calls) 169 */ 170 int 171 nqsrv_getlease(vp, duration, flags, slp, procp, nam, cachablep, frev, cred) 172 struct vnode *vp; 173 u_int32_t *duration; 174 int flags; 175 struct nfssvc_sock *slp; 176 struct proc *procp; 177 struct mbuf *nam; 178 int *cachablep; 179 u_quad_t *frev; 180 struct ucred *cred; 181 { 182 struct nqlease *lp; 183 struct nqfhhashhead *lpp = NULL; 184 struct nqhost *lph = NULL; 185 struct nqlease *tlp; 186 struct nqm **lphp; 187 struct vattr vattr; 188 fhandle_t fh; 189 int i, ok, error, s; 190 191 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) 192 return (0); 193 if (*duration > nqsrv_maxlease) 194 *duration = nqsrv_maxlease; 195 error = VOP_GETATTR(vp, &vattr, cred, procp); 196 if (error) 197 return (error); 198 *frev = vattr.va_filerev; 199 s = splsoftnet(); 200 tlp = vp->v_lease; 201 if ((flags & ND_CHECK) == 0) 202 nfsstats.srvnqnfs_getleases++; 203 if (tlp == 0) { 204 /* 205 * Find the lease by searching the hash list. 206 */ 207 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 208 error = VFS_VPTOFH(vp, &fh.fh_fid); 209 if (error) { 210 splx(s); 211 return (error); 212 } 213 lpp = NQFHHASH(fh.fh_fid.fid_data); 214 LIST_FOREACH (lp, lpp, lc_hash) { 215 if (fh.fh_fsid.val[0] == lp->lc_fsid.val[0] && 216 fh.fh_fsid.val[1] == lp->lc_fsid.val[1] && 217 !memcmp(fh.fh_fid.fid_data, lp->lc_fiddata, 218 fh.fh_fid.fid_len - sizeof (int32_t))) { 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); 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 * Allocate new lease 299 * The value of nqsrv_maxnumlease should be set generously, so that 300 * the following "printf" happens infrequently. 301 */ 302 if (nfsstats.srvnqnfs_leases > nqsrv_maxnumlease) { 303 printf("Nqnfs server, too many leases\n"); 304 do { 305 (void) tsleep((caddr_t)&lbolt, PSOCK, 306 "nqsrvnuml", 0); 307 } while (nfsstats.srvnqnfs_leases > nqsrv_maxnumlease); 308 } 309 MALLOC(lp, struct nqlease *, sizeof (struct nqlease), M_NQLEASE, M_WAITOK); 310 memset((caddr_t)lp, 0, sizeof (struct nqlease)); 311 if (flags & ND_WRITE) 312 lp->lc_flag |= (LC_WRITE | LC_WRITTEN); 313 nqsrv_addhost(&lp->lc_host, slp, nam); 314 lp->lc_vp = vp; 315 lp->lc_fsid = fh.fh_fsid; 316 memcpy(lp->lc_fiddata, fh.fh_fid.fid_data, 317 fh.fh_fid.fid_len - sizeof (int32_t)); 318 if(!lpp) 319 panic("nfs_nqlease.c: Phoney lpp"); 320 LIST_INSERT_HEAD(lpp, lp, lc_hash); 321 vp->v_lease = lp; 322 s = splsoftnet(); 323 nqsrv_instimeq(lp, *duration); 324 splx(s); 325 *cachablep = 1; 326 if (++nfsstats.srvnqnfs_leases > nfsstats.srvnqnfs_maxleases) 327 nfsstats.srvnqnfs_maxleases = nfsstats.srvnqnfs_leases; 328 return (0); 329 } 330 331 /* 332 * Add a host to an nqhost structure for a lease. 333 */ 334 void 335 nqsrv_addhost(lph, slp, nam) 336 struct nqhost *lph; 337 struct nfssvc_sock *slp; 338 struct mbuf *nam; 339 { 340 struct sockaddr_in *saddr; 341 342 if (slp == NQLOCALSLP) 343 lph->lph_flag |= (LC_VALID | LC_LOCAL); 344 else if (slp == nfs_udpsock) { 345 saddr = mtod(nam, struct sockaddr_in *); 346 lph->lph_flag |= (LC_VALID | LC_UDP); 347 lph->lph_inetaddr = saddr->sin_addr.s_addr; 348 lph->lph_port = saddr->sin_port; 349 #ifdef INET6 350 } else if (slp == nfs_udp6sock) { 351 lph->lph_nam = m_copym(nam, 0, M_COPYALL, M_WAIT); 352 lph->lph_flag |= (LC_VALID | LC_UDP6); 353 #endif 354 #ifdef ISO 355 } else if (slp == nfs_cltpsock) { 356 lph->lph_nam = m_copym(nam, 0, M_COPYALL, M_WAIT); 357 lph->lph_flag |= (LC_VALID | LC_CLTP); 358 #endif 359 } else { 360 lph->lph_flag |= (LC_VALID | LC_SREF); 361 lph->lph_slp = slp; 362 slp->ns_sref++; 363 } 364 } 365 366 /* 367 * Update the lease expiry time and position it in the timer queue correctly. 368 */ 369 void 370 nqsrv_instimeq(lp, duration) 371 struct nqlease *lp; 372 u_int32_t duration; 373 { 374 struct nqlease *tlp; 375 time_t newexpiry; 376 377 newexpiry = time.tv_sec + duration + nqsrv_clockskew; 378 if (lp->lc_expiry == newexpiry) 379 return; 380 if (CIRCLEQ_NEXT(lp, lc_timer) != 0) 381 CIRCLEQ_REMOVE(&nqtimerhead, lp, lc_timer); 382 lp->lc_expiry = newexpiry; 383 384 /* 385 * Find where in the queue it should be. 386 */ 387 tlp = CIRCLEQ_LAST(&nqtimerhead); 388 while (tlp != (void *)&nqtimerhead && tlp->lc_expiry > newexpiry) 389 tlp = CIRCLEQ_PREV(tlp, lc_timer); 390 #ifdef HASNVRAM 391 if (tlp == CIRCLEQ_LAST(&nqtimerhead)) 392 NQSTORENOVRAM(newexpiry); 393 #endif /* HASNVRAM */ 394 if (tlp == (void *)&nqtimerhead) { 395 CIRCLEQ_INSERT_HEAD(&nqtimerhead, lp, lc_timer); 396 } else { 397 CIRCLEQ_INSERT_AFTER(&nqtimerhead, tlp, lp, lc_timer); 398 } 399 } 400 401 /* 402 * Compare the requesting host address with the lph entry in the lease. 403 * Return true iff it is the same. 404 * This is somewhat messy due to the union in the nqhost structure. 405 * The local host is indicated by the special value of NQLOCALSLP for slp. 406 */ 407 int 408 nqsrv_cmpnam(slp, nam, lph) 409 struct nfssvc_sock *slp; 410 struct mbuf *nam; 411 struct nqhost *lph; 412 { 413 struct sockaddr_in *saddr; 414 struct mbuf *addr; 415 union nethostaddr lhaddr; 416 int ret; 417 418 if (slp == NQLOCALSLP) { 419 if (lph->lph_flag & LC_LOCAL) 420 return (1); 421 else 422 return (0); 423 } 424 if (slp == nfs_udpsock 425 #ifdef ISO 426 || slp == nfs_cltpsock 427 #endif 428 #ifdef INET6 429 || slp == nfs_udp6sock 430 #endif 431 ) 432 addr = nam; 433 else 434 addr = slp->ns_nam; 435 if (lph->lph_flag & LC_UDP) 436 ret = netaddr_match(AF_INET, &lph->lph_haddr, addr); 437 else if (lph->lph_flag & LC_CLTP) 438 ret = netaddr_match(AF_ISO, &lph->lph_claddr, addr); 439 else { 440 if ((lph->lph_slp->ns_flag & SLP_VALID) == 0) 441 return (0); 442 saddr = mtod(lph->lph_slp->ns_nam, struct sockaddr_in *); 443 if (saddr->sin_family == AF_INET) 444 lhaddr.had_inetaddr = saddr->sin_addr.s_addr; 445 else 446 lhaddr.had_nam = lph->lph_slp->ns_nam; 447 ret = netaddr_match(saddr->sin_family, &lhaddr, addr); 448 } 449 return (ret); 450 } 451 452 /* 453 * Send out eviction notice messages to all other hosts for the lease. 454 */ 455 void 456 nqsrv_send_eviction(vp, lp, slp, nam, cred) 457 struct vnode *vp; 458 struct nqlease *lp; 459 struct nfssvc_sock *slp; 460 struct mbuf *nam; 461 struct ucred *cred; 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 nfsfh_t nfh; 471 fhandle_t *fhp; 472 caddr_t bpos, cp; 473 u_int32_t xid, *tl; 474 int len = 1, ok = 1, i = 0; 475 int sotype, *solockp; 476 477 while (ok && (lph->lph_flag & LC_VALID)) { 478 if (nqsrv_cmpnam(slp, nam, lph)) 479 lph->lph_flag |= LC_VACATED; 480 else if ((lph->lph_flag & (LC_LOCAL | LC_VACATED)) == 0) { 481 if (lph->lph_flag & LC_UDP) { 482 nam2 = m_get(M_WAIT, MT_SONAME); 483 MCLAIM(nam2, &nfs_mowner); 484 saddr = mtod(nam2, struct sockaddr_in *); 485 nam2->m_len = saddr->sin_len = 486 sizeof (struct sockaddr_in); 487 saddr->sin_family = AF_INET; 488 saddr->sin_addr.s_addr = lph->lph_inetaddr; 489 saddr->sin_port = lph->lph_port; 490 so = nfs_udpsock->ns_so; 491 #ifdef ISO 492 } else if (lph->lph_flag & LC_CLTP) { 493 nam2 = lph->lph_nam; 494 so = nfs_cltpsock->ns_so; 495 #endif 496 #ifdef INET6 497 } else if (lph->lph_flag & LC_UDP6) { 498 nam2 = lph->lph_nam; 499 so = nfs_udp6sock->ns_so; 500 #endif 501 } else if (lph->lph_slp->ns_flag & SLP_VALID) { 502 nam2 = (struct mbuf *)0; 503 so = lph->lph_slp->ns_so; 504 } else 505 goto nextone; 506 if (!so) 507 goto nextone; 508 sotype = so->so_type; 509 if (so->so_proto->pr_flags & PR_CONNREQUIRED) 510 solockp = &lph->lph_slp->ns_solock; 511 else 512 solockp = (int *)0; 513 nfsm_reqhead((struct nfsnode *)0, NQNFSPROC_EVICTED, 514 NFSX_V3FH + NFSX_UNSIGNED); 515 fhp = &nfh.fh_generic; 516 memset((caddr_t)fhp, 0, sizeof(nfh)); 517 fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid; 518 VFS_VPTOFH(vp, &fhp->fh_fid); 519 nfsm_srvfhtom(fhp, 1); 520 m = mreq; 521 siz = 0; 522 while (m) { 523 siz += m->m_len; 524 m = m->m_next; 525 } 526 if (siz <= 0 || siz > NFS_MAXPACKET) { 527 printf("mbuf siz=%d\n",siz); 528 panic("Bad nfs svc reply"); 529 } 530 m = nfsm_rpchead(cred, (NFSMNT_NFSV3 | NFSMNT_NQNFS), 531 NQNFSPROC_EVICTED, 532 RPCAUTH_UNIX, 5 * NFSX_UNSIGNED, (char *)0, 533 0, (char *)0, mreq, siz, &mheadend, &xid); 534 /* 535 * For stream protocols, prepend a Sun RPC 536 * Record Mark. 537 */ 538 if (sotype == SOCK_STREAM) { 539 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 540 *mtod(m, u_int32_t *) = htonl(0x80000000 | 541 (m->m_pkthdr.len - NFSX_UNSIGNED)); 542 } 543 if (((lph->lph_flag & (LC_UDP | LC_CLTP | LC_UDP6)) 544 == 0 && 545 (lph->lph_slp->ns_flag & SLP_VALID) == 0) || 546 (solockp && (*solockp & NFSMNT_SNDLOCK))) 547 m_freem(m); 548 else { 549 if (solockp) 550 *solockp |= NFSMNT_SNDLOCK; 551 (void) nfs_send(so, nam2, m, 552 (struct nfsreq *)0); 553 if (solockp) 554 nfs_sndunlock(solockp); 555 } 556 if (lph->lph_flag & LC_UDP) 557 (void) m_free(nam2); 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 void 579 nqsrv_waitfor_expiry(lp) 580 struct nqlease *lp; 581 { 582 struct nqhost *lph; 583 int i; 584 struct nqm *lphnext; 585 int len, ok; 586 587 tryagain: 588 if (time.tv_sec > lp->lc_expiry) 589 return; 590 lph = &lp->lc_host; 591 lphnext = lp->lc_morehosts; 592 len = 1; 593 i = 0; 594 ok = 1; 595 while (ok && (lph->lph_flag & LC_VALID)) { 596 if ((lph->lph_flag & (LC_LOCAL | LC_VACATED)) == 0) { 597 lp->lc_flag |= LC_EXPIREDWANTED; 598 (void) tsleep((caddr_t)&lp->lc_flag, PSOCK, 599 "nqexp", 0); 600 goto tryagain; 601 } 602 if (++i == len) { 603 if (lphnext) { 604 i = 0; 605 len = LC_MOREHOSTSIZ; 606 lph = lphnext->lpm_hosts; 607 lphnext = lphnext->lpm_next; 608 } else 609 ok = 0; 610 } else 611 lph++; 612 } 613 } 614 #endif /* NFSSERVER || (NFS && !NFS_V2_ONLY) */ 615 616 #ifdef NFSSERVER 617 /* 618 * Nqnfs server timer that maintains the server lease queue. 619 * Scan the lease queue for expired entries: 620 * - when one is found, wakeup anyone waiting for it 621 * else dequeue and free 622 */ 623 void 624 nqnfs_serverd() 625 { 626 struct nqlease *lp; 627 struct nqhost *lph; 628 struct nqlease *nextlp; 629 struct nqm *lphnext, *olphnext; 630 int i, len, ok; 631 632 for (lp = CIRCLEQ_FIRST(&nqtimerhead); lp != (void *)&nqtimerhead; 633 lp = nextlp) { 634 if (lp->lc_expiry >= time.tv_sec) 635 break; 636 nextlp = CIRCLEQ_NEXT(lp, lc_timer); 637 if (lp->lc_flag & LC_EXPIREDWANTED) { 638 lp->lc_flag &= ~LC_EXPIREDWANTED; 639 wakeup((caddr_t)&lp->lc_flag); 640 } else if ((lp->lc_flag & (LC_LOCKED | LC_WANTED)) == 0) { 641 /* 642 * Make a best effort at keeping a write caching lease long 643 * enough by not deleting it until it has been explicitly 644 * vacated or there have been no writes in the previous 645 * write_slack seconds since expiry and the nfsds are not 646 * all busy. The assumption is that if the nfsds are not 647 * all busy now (no queue of nfs requests), then the client 648 * would have been able to do at least one write to the 649 * file during the last write_slack seconds if it was still 650 * trying to push writes to the server. 651 */ 652 if ((lp->lc_flag & (LC_WRITE | LC_VACATED)) == LC_WRITE && 653 ((lp->lc_flag & LC_WRITTEN) || nfsd_waiting == 0)) { 654 lp->lc_flag &= ~LC_WRITTEN; 655 nqsrv_instimeq(lp, nqsrv_writeslack); 656 } else { 657 CIRCLEQ_REMOVE(&nqtimerhead, lp, lc_timer); 658 LIST_REMOVE(lp, lc_hash); 659 /* 660 * This soft reference may no longer be valid, but 661 * no harm done. The worst case is if the vnode was 662 * recycled and has another valid lease reference, 663 * which is dereferenced prematurely. 664 */ 665 lp->lc_vp->v_lease = (struct nqlease *)0; 666 lph = &lp->lc_host; 667 lphnext = lp->lc_morehosts; 668 olphnext = (struct nqm *)0; 669 len = 1; 670 i = 0; 671 ok = 1; 672 while (ok && (lph->lph_flag & LC_VALID)) { 673 if (lph->lph_flag & (LC_CLTP | LC_UDP6)) 674 (void) m_free(lph->lph_nam); 675 if (lph->lph_flag & LC_SREF) 676 nfsrv_slpderef(lph->lph_slp); 677 if (++i == len) { 678 if (olphnext) { 679 free((caddr_t)olphnext, M_NQMHOST); 680 olphnext = (struct nqm *)0; 681 } 682 if (lphnext) { 683 olphnext = lphnext; 684 i = 0; 685 len = LC_MOREHOSTSIZ; 686 lph = lphnext->lpm_hosts; 687 lphnext = lphnext->lpm_next; 688 } else 689 ok = 0; 690 } else 691 lph++; 692 } 693 FREE((caddr_t)lp, M_NQLEASE); 694 if (olphnext) 695 free((caddr_t)olphnext, M_NQMHOST); 696 nfsstats.srvnqnfs_leases--; 697 } 698 } 699 } 700 } 701 702 /* 703 * Called from nfssvc_nfsd() for a getlease rpc request. 704 * Do the from/to xdr translation and call nqsrv_getlease() to 705 * do the real work. 706 */ 707 int 708 nqnfsrv_getlease(nfsd, slp, procp, mrq) 709 struct nfsrv_descript *nfsd; 710 struct nfssvc_sock *slp; 711 struct proc *procp; 712 struct mbuf **mrq; 713 { 714 struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; 715 struct mbuf *nam = nfsd->nd_nam; 716 caddr_t dpos = nfsd->nd_dpos; 717 struct ucred *cred = &nfsd->nd_cr; 718 struct nfs_fattr *fp; 719 struct vattr va; 720 struct vnode *vp; 721 nfsfh_t nfh; 722 fhandle_t *fhp; 723 u_int32_t *tl; 724 int32_t t1; 725 u_quad_t frev; 726 caddr_t bpos; 727 int error = 0; 728 char *cp2; 729 struct mbuf *mb, *mreq; 730 int flags, rdonly, cache; 731 732 fhp = &nfh.fh_generic; 733 nfsm_srvmtofh(fhp); 734 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 735 flags = fxdr_unsigned(int, *tl++); 736 nfsd->nd_duration = fxdr_unsigned(int, *tl); 737 error = nfsrv_fhtovp(fhp, 1, &vp, cred, slp, nam, &rdonly, 738 (nfsd->nd_flag & ND_KERBAUTH), FALSE); 739 if (error) { 740 nfsm_reply(0); 741 return 0; 742 } 743 if (rdonly && flags == ND_WRITE) { 744 vput(vp); 745 error = EROFS; 746 nfsm_reply(0); 747 return 0; 748 } 749 (void) nqsrv_getlease(vp, &nfsd->nd_duration, flags, slp, procp, 750 nam, &cache, &frev, cred); 751 error = VOP_GETATTR(vp, &va, cred, procp); 752 vput(vp); 753 nfsm_reply(NFSX_V3FATTR + 4 * NFSX_UNSIGNED); 754 nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED); 755 *tl++ = txdr_unsigned(cache); 756 *tl++ = txdr_unsigned(nfsd->nd_duration); 757 txdr_hyper(frev, tl); 758 nfsm_build(fp, struct nfs_fattr *, NFSX_V3FATTR); 759 nfsm_srvfillattr(&va, fp); 760 nfsm_srvdone; 761 } 762 763 /* 764 * Called from nfssvc_nfsd() when a "vacated" message is received from a 765 * client. Find the entry and expire it. 766 */ 767 int 768 nqnfsrv_vacated(nfsd, slp, procp, mrq) 769 struct nfsrv_descript *nfsd; 770 struct nfssvc_sock *slp; 771 struct proc *procp; 772 struct mbuf **mrq; 773 { 774 struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; 775 struct mbuf *nam = nfsd->nd_nam; 776 caddr_t dpos = nfsd->nd_dpos; 777 struct nqlease *lp; 778 struct nqhost *lph; 779 struct nqlease *tlp = (struct nqlease *)0; 780 nfsfh_t nfh; 781 fhandle_t *fhp; 782 u_int32_t *tl; 783 int32_t t1; 784 struct nqm *lphnext; 785 struct mbuf *mreq, *mb; 786 int error = 0, i, len, ok, gotit = 0, cache = 0; 787 char *cp2, *bpos; 788 u_quad_t frev; 789 790 fhp = &nfh.fh_generic; 791 nfsm_srvmtofh(fhp); 792 m_freem(mrep); 793 /* 794 * Find the lease by searching the hash list. 795 */ 796 LIST_FOREACH(lp, NQFHHASH(fhp->fh_fid.fid_data), lc_hash) { 797 if (fhp->fh_fsid.val[0] == lp->lc_fsid.val[0] && 798 fhp->fh_fsid.val[1] == lp->lc_fsid.val[1] && 799 !memcmp(fhp->fh_fid.fid_data, lp->lc_fiddata, 800 MAXFIDSZ)) { 801 /* Found it */ 802 tlp = lp; 803 break; 804 } 805 } 806 if (tlp != 0) { 807 lp = tlp; 808 len = 1; 809 i = 0; 810 lph = &lp->lc_host; 811 lphnext = lp->lc_morehosts; 812 ok = 1; 813 while (ok && (lph->lph_flag & LC_VALID)) { 814 if (nqsrv_cmpnam(slp, nam, lph)) { 815 lph->lph_flag |= LC_VACATED; 816 gotit++; 817 break; 818 } 819 if (++i == len) { 820 if (lphnext) { 821 len = LC_MOREHOSTSIZ; 822 i = 0; 823 lph = lphnext->lpm_hosts; 824 lphnext = lphnext->lpm_next; 825 } else 826 ok = 0; 827 } else 828 lph++; 829 } 830 if ((lp->lc_flag & LC_EXPIREDWANTED) && gotit) { 831 lp->lc_flag &= ~LC_EXPIREDWANTED; 832 wakeup((caddr_t)&lp->lc_flag); 833 } 834 nfsmout: 835 return (EPERM); 836 } 837 return (EPERM); 838 } 839 #endif /* NFSSERVER */ 840 841 #if defined(NFS) && !defined(NFS_V2_ONLY) 842 /* 843 * Client get lease rpc function. 844 */ 845 int 846 nqnfs_getlease(vp, rwflag, cred, p) 847 struct vnode *vp; 848 int rwflag; 849 struct ucred *cred; 850 struct proc *p; 851 { 852 u_int32_t *tl; 853 caddr_t cp; 854 int32_t t1, t2; 855 struct nfsnode *np; 856 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 857 caddr_t bpos, dpos, cp2; 858 time_t reqtime; 859 int error = 0; 860 struct mbuf *mreq, *mrep, *md, *mb; 861 int cachable; 862 u_quad_t frev; 863 864 nfsstats.rpccnt[NQNFSPROC_GETLEASE]++; 865 np = VTONFS(vp); 866 mb = mreq = nfsm_reqh(np, NQNFSPROC_GETLEASE, NFSX_V3FH+2*NFSX_UNSIGNED, 867 &bpos); 868 nfsm_fhtom(np, 1); 869 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 870 *tl++ = txdr_unsigned(rwflag); 871 *tl = txdr_unsigned(nmp->nm_leaseterm); 872 reqtime = time.tv_sec; 873 nfsm_request(np, NQNFSPROC_GETLEASE, p, cred); 874 nfsm_dissect(tl, u_int32_t *, 4 * NFSX_UNSIGNED); 875 cachable = fxdr_unsigned(int, *tl++); 876 reqtime += fxdr_unsigned(int, *tl++); 877 if (reqtime > time.tv_sec) { 878 frev = fxdr_hyper(tl); 879 nqnfs_clientlease(nmp, np, rwflag, cachable, reqtime, frev); 880 nfsm_loadattr(vp, (struct vattr *)0, 0); 881 } else 882 error = NQNFS_EXPIRED; 883 nfsm_reqdone; 884 return (error); 885 } 886 887 /* 888 * Client vacated message function. 889 */ 890 int 891 nqnfs_vacated(vp, cred) 892 struct vnode *vp; 893 struct ucred *cred; 894 { 895 caddr_t cp; 896 struct mbuf *m; 897 int i; 898 u_int32_t *tl; 899 int32_t t2; 900 caddr_t bpos; 901 u_int32_t xid; 902 int error = 0; 903 struct mbuf *mreq, *mb, *mheadend; 904 struct nfsmount *nmp; 905 struct nfsreq myrep; 906 struct nfsnode *np = VTONFS(vp); 907 908 nmp = VFSTONFS(vp->v_mount); 909 nfsstats.rpccnt[NQNFSPROC_VACATED]++; 910 nfsm_reqhead(np, NQNFSPROC_VACATED, NFSX_FH(1)); 911 nfsm_fhtom(np, 1); 912 m = mreq; 913 i = 0; 914 while (m) { 915 i += m->m_len; 916 m = m->m_next; 917 } 918 m = nfsm_rpchead(cred, nmp->nm_flag, NQNFSPROC_VACATED, 919 RPCAUTH_UNIX, 5 * NFSX_UNSIGNED, (char *)0, 920 0, (char *)0, mreq, i, &mheadend, &xid); 921 if (nmp->nm_sotype == SOCK_STREAM) { 922 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 923 *mtod(m, u_int32_t *) = htonl(0x80000000 | (m->m_pkthdr.len - 924 NFSX_UNSIGNED)); 925 } 926 myrep.r_flags = 0; 927 myrep.r_nmp = nmp; 928 if (nmp->nm_soflags & PR_CONNREQUIRED) 929 (void) nfs_sndlock(&nmp->nm_iflag, (struct nfsreq *)0); 930 (void) nfs_send(nmp->nm_so, nmp->nm_nam, m, &myrep); 931 if (nmp->nm_soflags & PR_CONNREQUIRED) 932 nfs_sndunlock(&nmp->nm_iflag); 933 nfsmout: 934 return (error); 935 } 936 937 /* 938 * Called for client side callbacks 939 */ 940 int 941 nqnfs_callback(nmp, mrep, md, dpos) 942 struct nfsmount *nmp; 943 struct mbuf *mrep, *md; 944 caddr_t dpos; 945 { 946 struct vnode *vp; 947 u_int32_t *tl; 948 int32_t t1; 949 nfsfh_t nfh; 950 fhandle_t *fhp; 951 struct nfsnode *np; 952 struct nfsd tnfsd; 953 struct nfssvc_sock *slp; 954 struct nfsrv_descript ndesc; 955 struct nfsrv_descript *nfsd = &ndesc; 956 struct mbuf **mrq = (struct mbuf **)0, *mb, *mreq; 957 int error = 0, cache = 0; 958 char *cp2, *bpos; 959 u_quad_t frev; 960 961 #ifndef nolint 962 slp = NULL; 963 #endif 964 nfsd->nd_mrep = mrep; 965 nfsd->nd_md = md; 966 nfsd->nd_dpos = dpos; 967 error = nfs_getreq(nfsd, &tnfsd, FALSE); 968 if (error) 969 return (error); 970 md = nfsd->nd_md; 971 dpos = nfsd->nd_dpos; 972 if (nfsd->nd_procnum != NQNFSPROC_EVICTED) { 973 m_freem(mrep); 974 return (EPERM); 975 } 976 fhp = &nfh.fh_generic; 977 nfsm_srvmtofh(fhp); 978 m_freem(mrep); 979 error = nfs_nget(nmp->nm_mountp, (nfsfh_t *)fhp, NFSX_V3FH, &np); 980 if (error) 981 return (error); 982 vp = NFSTOV(np); 983 if (CIRCLEQ_NEXT(np, n_timer) != 0) { 984 np->n_expiry = 0; 985 np->n_flag |= NQNFSEVICTED; 986 if (CIRCLEQ_FIRST(&nmp->nm_timerhead) != np) { 987 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer); 988 CIRCLEQ_INSERT_HEAD(&nmp->nm_timerhead, np, n_timer); 989 } 990 } 991 vput(vp); 992 nfsm_srvdone; 993 } 994 #endif /* NFS && !NFS_V2_ONLY */ 995 996 #ifdef NFS /* Needed in V2_ONLY case for Kerberos stuff */ 997 /* 998 * Nqnfs client helper daemon. Runs once a second to expire leases. 999 * It also get authorization strings for "kerb" mounts. 1000 * It must start at the beginning of the list again after any potential 1001 * "sleep" since nfs_reclaim() called from vclean() can pull a node off 1002 * the list asynchronously. 1003 */ 1004 int 1005 nqnfs_clientd(nmp, cred, ncd, flag, argp, l) 1006 struct nfsmount *nmp; 1007 struct ucred *cred; 1008 struct nfsd_cargs *ncd; 1009 int flag; 1010 caddr_t argp; 1011 struct lwp *l; 1012 { 1013 struct proc *p = l->l_proc; 1014 #ifndef NFS_V2_ONLY 1015 struct nfsnode *np; 1016 struct vnode *vp; 1017 struct nfsreq myrep; 1018 #endif 1019 int error = 0, sleepreturn; 1020 struct nfsuid *nuidp, *nnuidp; 1021 1022 /* 1023 * First initialize some variables 1024 */ 1025 1026 /* 1027 * If an authorization string is being passed in, get it. 1028 */ 1029 if ((flag & NFSSVC_GOTAUTH) && 1030 (nmp->nm_iflag & (NFSMNT_WAITAUTH | NFSMNT_DISMNT)) == 0) { 1031 if (nmp->nm_iflag & NFSMNT_HASAUTH) 1032 panic("cld kerb"); 1033 if ((flag & NFSSVC_AUTHINFAIL) == 0) { 1034 if (ncd->ncd_authlen <= nmp->nm_authlen && 1035 ncd->ncd_verflen <= nmp->nm_verflen && 1036 !copyin(ncd->ncd_authstr,nmp->nm_authstr,ncd->ncd_authlen)&& 1037 !copyin(ncd->ncd_verfstr,nmp->nm_verfstr,ncd->ncd_verflen)){ 1038 nmp->nm_authtype = ncd->ncd_authtype; 1039 nmp->nm_authlen = ncd->ncd_authlen; 1040 nmp->nm_verflen = ncd->ncd_verflen; 1041 #ifdef NFSKERB 1042 nmp->nm_key = ncd->ncd_key; 1043 #endif 1044 } else 1045 nmp->nm_iflag |= NFSMNT_AUTHERR; 1046 } else 1047 nmp->nm_iflag |= NFSMNT_AUTHERR; 1048 nmp->nm_iflag |= NFSMNT_HASAUTH; 1049 wakeup((caddr_t)&nmp->nm_authlen); 1050 } else 1051 nmp->nm_iflag |= NFSMNT_WAITAUTH; 1052 1053 /* 1054 * Loop every second updating queue until there is a termination sig. 1055 */ 1056 sleepreturn = 0; 1057 while ((nmp->nm_iflag & NFSMNT_DISMNT) == 0) { 1058 if (sleepreturn == EINTR || sleepreturn == ERESTART) { 1059 /* 1060 * XXX Freeze syncer. Must do this before locking 1061 * the mount point. See dounmount() for details. 1062 */ 1063 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 1064 if (vfs_busy(nmp->nm_mountp, LK_NOWAIT, 0) != 0) 1065 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 1066 else if (dounmount(nmp->nm_mountp, 0, p) != 0) 1067 CLRSIG(p, CURSIG(l)); 1068 sleepreturn = 0; 1069 continue; 1070 } 1071 #ifndef NFS_V2_ONLY 1072 if (nmp->nm_flag & NFSMNT_NQNFS) { 1073 /* 1074 * If there are no outstanding requests (and therefore no 1075 * processes in nfs_reply) and there is data in the receive 1076 * queue, poke for callbacks. 1077 */ 1078 if (TAILQ_EMPTY(&nfs_reqq) && nmp->nm_so && 1079 nmp->nm_so->so_rcv.sb_cc > 0) { 1080 myrep.r_flags = R_GETONEREP; 1081 myrep.r_nmp = nmp; 1082 myrep.r_mrep = (struct mbuf *)0; 1083 myrep.r_procp = (struct proc *)0; 1084 (void) nfs_reply(&myrep); 1085 } 1086 1087 /* 1088 * Loop through the leases, updating as required. 1089 */ 1090 np = CIRCLEQ_FIRST(&nmp->nm_timerhead); 1091 while (np != (void *)&nmp->nm_timerhead && 1092 (nmp->nm_iflag & NFSMNT_DISMINPROG) == 0) { 1093 vp = NFSTOV(np); 1094 if (np->n_expiry < time.tv_sec) { 1095 if (vget(vp, LK_EXCLUSIVE) == 0) { 1096 nmp->nm_inprog = vp; 1097 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer); 1098 /* mark this off the list */ 1099 CIRCLEQ_NEXT(np, n_timer) = 0; /* XXX */ 1100 if (np->n_flag & (NMODIFIED | NQNFSEVICTED)) { 1101 if (np->n_flag & NQNFSEVICTED) { 1102 if (vp->v_type == VDIR) 1103 nfs_invaldircache(vp,0); 1104 cache_purge(vp); 1105 (void) nfs_vinvalbuf(vp, 1106 V_SAVE, cred, p, 0); 1107 np->n_flag &= ~NQNFSEVICTED; 1108 (void) nqnfs_vacated(vp, cred); 1109 } else if (vp->v_type == VREG) { 1110 (void) VOP_FSYNC(vp, cred, 1111 FSYNC_WAIT, 0, 0, p); 1112 np->n_flag &= ~NMODIFIED; 1113 } 1114 } 1115 vput(vp); 1116 nmp->nm_inprog = NULLVP; 1117 } 1118 } else if ((np->n_expiry - NQ_RENEWAL) < time.tv_sec) { 1119 if ((np->n_flag & (NQNFSWRITE | NQNFSNONCACHE)) 1120 == NQNFSWRITE && 1121 !LIST_EMPTY(&vp->v_dirtyblkhd) && 1122 vget(vp, LK_EXCLUSIVE) == 0) { 1123 nmp->nm_inprog = vp; 1124 if (nqnfs_getlease(vp, ND_WRITE, cred, p)==0) 1125 np->n_brev = np->n_lrev; 1126 vput(vp); 1127 nmp->nm_inprog = NULLVP; 1128 } 1129 } else 1130 break; 1131 if (np == CIRCLEQ_FIRST(&nmp->nm_timerhead)) 1132 break; 1133 np = CIRCLEQ_FIRST(&nmp->nm_timerhead); 1134 } 1135 } 1136 #endif /* !NFS_V2_ONLY */ 1137 1138 /* 1139 * Get an authorization string, if required. 1140 */ 1141 if ((nmp->nm_iflag & (NFSMNT_WAITAUTH | NFSMNT_DISMNT | NFSMNT_HASAUTH)) == 0) { 1142 ncd->ncd_authuid = nmp->nm_authuid; 1143 if (copyout((caddr_t)ncd, argp, sizeof (struct nfsd_cargs))) 1144 nmp->nm_iflag |= NFSMNT_WAITAUTH; 1145 else 1146 return (ENEEDAUTH); 1147 } 1148 1149 /* 1150 * Wait a bit (no pun) and do it again. 1151 */ 1152 if ((nmp->nm_iflag & NFSMNT_DISMNT) == 0 && 1153 (nmp->nm_iflag & (NFSMNT_WAITAUTH | NFSMNT_HASAUTH))) { 1154 sleepreturn = tsleep((caddr_t)&nmp->nm_authstr, 1155 PSOCK | PCATCH, "nqnfstimr", hz / 3); 1156 } 1157 } 1158 1159 /* 1160 * Finally, we can free up the mount structure. 1161 */ 1162 for (nuidp = TAILQ_FIRST(&nmp->nm_uidlruhead); nuidp != 0; 1163 nuidp = nnuidp) { 1164 nnuidp = TAILQ_NEXT(nuidp, nu_lru); 1165 LIST_REMOVE(nuidp, nu_hash); 1166 TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru); 1167 free((caddr_t)nuidp, M_NFSUID); 1168 } 1169 free((caddr_t)nmp, M_NFSMNT); 1170 if (error == EWOULDBLOCK) 1171 error = 0; 1172 return (error); 1173 } 1174 #endif /* NFS */ 1175 1176 #if defined(NFS) && !defined(NFS_V2_ONLY) 1177 /* 1178 * Update a client lease. 1179 */ 1180 void 1181 nqnfs_clientlease(nmp, np, rwflag, cachable, expiry, frev) 1182 struct nfsmount *nmp; 1183 struct nfsnode *np; 1184 int rwflag, cachable; 1185 time_t expiry; 1186 u_quad_t frev; 1187 { 1188 struct nfsnode *tp; 1189 1190 if (CIRCLEQ_NEXT(np, n_timer) != 0) { 1191 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer); 1192 if (rwflag == ND_WRITE) 1193 np->n_flag |= NQNFSWRITE; 1194 } else if (rwflag == ND_READ) 1195 np->n_flag &= ~NQNFSWRITE; 1196 else 1197 np->n_flag |= NQNFSWRITE; 1198 if (cachable) 1199 np->n_flag &= ~NQNFSNONCACHE; 1200 else 1201 np->n_flag |= NQNFSNONCACHE; 1202 np->n_expiry = expiry; 1203 np->n_lrev = frev; 1204 tp = nmp->nm_timerhead.cqh_last; 1205 while (tp != (void *)&nmp->nm_timerhead && tp->n_expiry > np->n_expiry) 1206 tp = tp->n_timer.cqe_prev; 1207 if (tp == (void *)&nmp->nm_timerhead) { 1208 CIRCLEQ_INSERT_HEAD(&nmp->nm_timerhead, np, n_timer); 1209 } else { 1210 CIRCLEQ_INSERT_AFTER(&nmp->nm_timerhead, tp, np, n_timer); 1211 } 1212 } 1213 #endif /* NFS && !NFS_V2_ONLY */ 1214 1215 #if defined(NFSSERVER) || (defined(NFS) && !defined(NFS_V2_ONLY)) 1216 /* 1217 * Adjust all timer queue expiry times when the time of day clock is changed. 1218 * Called from the settimeofday() syscall. 1219 */ 1220 void 1221 nqnfs_lease_updatetime(deltat) 1222 int deltat; 1223 { 1224 struct nqlease *lp; 1225 struct nfsnode *np; 1226 struct mount *mp; 1227 struct nfsmount *nmp; 1228 int s; 1229 struct mount *nxtmp; 1230 1231 if (nqnfsstarttime != 0) 1232 nqnfsstarttime += deltat; 1233 s = splsoftnet(); 1234 CIRCLEQ_FOREACH(lp, &nqtimerhead, lc_timer) { 1235 lp->lc_expiry += deltat; 1236 } 1237 splx(s); 1238 1239 /* 1240 * Search the mount list for all nqnfs mounts and do their timer 1241 * queues. 1242 */ 1243 simple_lock(&mountlist_slock); 1244 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 1245 mp = nxtmp) { 1246 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 1247 nxtmp = CIRCLEQ_NEXT(mp, mnt_list); 1248 continue; 1249 } 1250 if (!strncmp(&mp->mnt_stat.f_fstypename[0], MOUNT_NFS, 1251 MFSNAMELEN)) { 1252 nmp = VFSTONFS(mp); 1253 if (nmp->nm_flag & NFSMNT_NQNFS) { 1254 CIRCLEQ_FOREACH(np, &nmp->nm_timerhead, 1255 n_timer) { 1256 np->n_expiry += deltat; 1257 } 1258 } 1259 } 1260 simple_lock(&mountlist_slock); 1261 nxtmp = CIRCLEQ_NEXT(mp, mnt_list); 1262 vfs_unbusy(mp); 1263 } 1264 simple_unlock(&mountlist_slock); 1265 } 1266 1267 /* 1268 * Lock a server lease. 1269 */ 1270 void 1271 nqsrv_locklease(lp) 1272 struct nqlease *lp; 1273 { 1274 1275 while (lp->lc_flag & LC_LOCKED) { 1276 lp->lc_flag |= LC_WANTED; 1277 (void) tsleep((caddr_t)lp, PSOCK, "nqlc", 0); 1278 } 1279 lp->lc_flag |= LC_LOCKED; 1280 lp->lc_flag &= ~LC_WANTED; 1281 } 1282 1283 /* 1284 * Unlock a server lease. 1285 */ 1286 void 1287 nqsrv_unlocklease(lp) 1288 struct nqlease *lp; 1289 { 1290 1291 lp->lc_flag &= ~LC_LOCKED; 1292 if (lp->lc_flag & LC_WANTED) 1293 wakeup((caddr_t)lp); 1294 } 1295 #endif /* NFSSERVER || NFS && !NFS_V2_ONLY */
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