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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 8.9 (Berkeley) 5/20/95 37 * $FreeBSD$ 38 */ 39 40 41 /* 42 * References: 43 * Cary G. Gray and David R. Cheriton, "Leases: An Efficient Fault-Tolerant 44 * Mechanism for Distributed File Cache Consistency", 45 * In Proc. of the Twelfth ACM Symposium on Operating Systems 46 * Principals, pg. 202-210, Litchfield Park, AZ, Dec. 1989. 47 * Michael N. Nelson, Brent B. Welch and John K. Ousterhout, "Caching 48 * in the Sprite Network File System", ACM TOCS 6(1), 49 * pages 134-154, February 1988. 50 * V. Srinivasan and Jeffrey C. Mogul, "Spritely NFS: Implementation and 51 * Performance of Cache-Consistency Protocols", Digital 52 * Equipment Corporation WRL Research Report 89/5, May 1989. 53 */ 54 #include <sys/param.h> 55 #include <sys/vnode.h> 56 #include <sys/malloc.h> 57 #include <sys/mount.h> 58 #include <sys/kernel.h> 59 #include <sys/proc.h> 60 #include <sys/systm.h> 61 #include <sys/mbuf.h> 62 #include <sys/socket.h> 63 #include <sys/socketvar.h> 64 #include <sys/protosw.h> 65 66 #include <vm/vm_zone.h> 67 68 #include <netinet/in.h> 69 #include <nfs/rpcv2.h> 70 #include <nfs/nfsproto.h> 71 #include <nfs/nfs.h> 72 #include <nfs/nfsm_subs.h> 73 #include <nfs/xdr_subs.h> 74 #include <nfs/nqnfs.h> 75 #include <nfs/nfsnode.h> 76 #include <nfs/nfsmount.h> 77 78 static MALLOC_DEFINE(M_NQMHOST, "NQNFS Host", "Nqnfs host address table"); 79 80 time_t nqnfsstarttime = (time_t)0; 81 int nqsrv_clockskew = NQ_CLOCKSKEW; 82 int nqsrv_writeslack = NQ_WRITESLACK; 83 int nqsrv_maxlease = NQ_MAXLEASE; 84 #ifndef NFS_NOSERVER 85 static int nqsrv_maxnumlease = NQ_MAXNUMLEASE; 86 #endif 87 88 struct vop_lease_args; 89 90 #ifndef NFS_NOSERVER 91 static int nqsrv_cmpnam __P((struct nfssvc_sock *, struct sockaddr *, 92 struct nqhost *)); 93 static int nqnfs_vacated __P((struct vnode *vp, struct ucred *cred)); 94 static void nqsrv_addhost __P((struct nqhost *lph, struct nfssvc_sock *slp, 95 struct sockaddr *nam)); 96 static void nqsrv_instimeq __P((struct nqlease *lp, u_int32_t duration)); 97 static void nqsrv_locklease __P((struct nqlease *lp)); 98 static void nqsrv_send_eviction __P((struct vnode *vp, struct nqlease *lp, 99 struct nfssvc_sock *slp, 100 struct sockaddr *nam, 101 struct ucred *cred)); 102 static void nqsrv_unlocklease __P((struct nqlease *lp)); 103 static void nqsrv_waitfor_expiry __P((struct nqlease *lp)); 104 #endif 105 extern void nqnfs_lease_updatetime __P((int deltat)); 106 107 /* 108 * Signifies which rpcs can have piggybacked lease requests 109 */ 110 int nqnfs_piggy[NFS_NPROCS] = { 111 0, 112 0, 113 ND_WRITE, 114 ND_READ, 115 0, 116 ND_READ, 117 ND_READ, 118 ND_WRITE, 119 0, 120 0, 121 0, 122 0, 123 0, 124 0, 125 0, 126 0, 127 ND_READ, 128 ND_READ, 129 0, 130 0, 131 0, 132 0, 133 0, 134 0, 135 0, 136 0, 137 }; 138 139 extern nfstype nfsv2_type[9]; 140 extern nfstype nfsv3_type[9]; 141 extern int nfsd_waiting; 142 extern struct nfsstats nfsstats; 143 144 #define TRUE 1 145 #define FALSE 0 146 147 #ifndef NFS_NOSERVER 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 splsoftclock() and splx(s) calls) 170 */ 171 int 172 nqsrv_getlease(vp, duration, flags, slp, procp, nam, cachablep, frev, cred) 173 struct vnode *vp; 174 u_int32_t *duration; 175 int flags; 176 struct nfssvc_sock *slp; 177 struct proc *procp; 178 struct sockaddr *nam; 179 int *cachablep; 180 u_quad_t *frev; 181 struct ucred *cred; 182 { 183 register struct nqlease *lp; 184 register struct nqfhhashhead *lpp = NULL; 185 register struct nqhost *lph = NULL; 186 struct nqlease *tlp; 187 struct nqm **lphp; 188 struct vattr vattr; 189 fhandle_t fh; 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 if (*duration > nqsrv_maxlease) 195 *duration = nqsrv_maxlease; 196 error = VOP_GETATTR(vp, &vattr, cred, procp); 197 if (error) 198 return (error); 199 *frev = vattr.va_filerev; 200 s = splsoftclock(); 201 tlp = vp->v_lease; 202 if ((flags & ND_CHECK) == 0) 203 nfsstats.srvnqnfs_getleases++; 204 if (tlp == 0) { 205 /* 206 * Find the lease by searching the hash list. 207 */ 208 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 209 error = VFS_VPTOFH(vp, &fh.fh_fid); 210 if (error) { 211 splx(s); 212 return (error); 213 } 214 lpp = NQFHHASH(fh.fh_fid.fid_data); 215 for (lp = lpp->lh_first; lp != 0; lp = lp->lc_hash.le_next) 216 if (fh.fh_fsid.val[0] == lp->lc_fsid.val[0] && 217 fh.fh_fsid.val[1] == lp->lc_fsid.val[1] && 218 !bcmp(fh.fh_fid.fid_data, lp->lc_fiddata, 219 fh.fh_fid.fid_len - sizeof (int32_t))) { 220 /* Found it */ 221 lp->lc_vp = vp; 222 vp->v_lease = lp; 223 tlp = lp; 224 break; 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 bzero((caddr_t)*lphp, 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 bzero((caddr_t)lp, 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 bcopy(fh.fh_fid.fid_data, lp->lc_fiddata, 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 = splsoftclock(); 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 * Local lease check for server syscalls. 333 * Just set up args and let nqsrv_getlease() do the rest. 334 * nqnfs_vop_lease_check() is the VOP_LEASE() form of the same routine. 335 * Ifdef'd code in nfsnode.h renames these routines to whatever a particular 336 * OS needs. 337 */ 338 void 339 nqnfs_lease_check(vp, p, cred, flag) 340 struct vnode *vp; 341 struct proc *p; 342 struct ucred *cred; 343 int flag; 344 { 345 u_int32_t duration = 0; 346 int cache; 347 u_quad_t frev; 348 349 (void) nqsrv_getlease(vp, &duration, ND_CHECK | flag, NQLOCALSLP, 350 p, (struct sockaddr *)0, &cache, &frev, cred); 351 } 352 353 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_int32_t 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 sockaddr *)0, 368 &cache, &frev, ap->a_cred); 369 return (0); 370 } 371 372 373 /* 374 * Add a host to an nqhost structure for a lease. 375 */ 376 static void 377 nqsrv_addhost(lph, slp, nam) 378 register struct nqhost *lph; 379 struct nfssvc_sock *slp; 380 struct sockaddr *nam; 381 { 382 struct sockaddr_in *saddr; 383 struct socket *nsso; 384 385 if (slp == NQLOCALSLP) { 386 lph->lph_flag |= (LC_VALID | LC_LOCAL); 387 return; 388 } 389 nsso = slp->ns_so; 390 lph->lph_slp = slp; 391 if (nsso && nsso->so_proto->pr_protocol == IPPROTO_UDP) { 392 saddr = (struct sockaddr_in *)nam; 393 lph->lph_flag |= (LC_VALID | LC_UDP); 394 lph->lph_inetaddr = saddr->sin_addr.s_addr; 395 lph->lph_port = saddr->sin_port; 396 } else { 397 lph->lph_flag |= (LC_VALID | LC_SREF); 398 slp->ns_sref++; 399 } 400 } 401 402 /* 403 * Update the lease expiry time and position it in the timer queue correctly. 404 */ 405 static void 406 nqsrv_instimeq(lp, duration) 407 register struct nqlease *lp; 408 u_int32_t duration; 409 { 410 register struct nqlease *tlp; 411 time_t newexpiry; 412 413 newexpiry = time_second + duration + nqsrv_clockskew; 414 if (lp->lc_expiry == newexpiry) 415 return; 416 if (lp->lc_timer.cqe_next != 0) { 417 CIRCLEQ_REMOVE(&nqtimerhead, lp, lc_timer); 418 } 419 lp->lc_expiry = newexpiry; 420 421 /* 422 * Find where in the queue it should be. 423 */ 424 tlp = nqtimerhead.cqh_last; 425 while (tlp != (void *)&nqtimerhead && tlp->lc_expiry > newexpiry) 426 tlp = tlp->lc_timer.cqe_prev; 427 #ifdef HASNVRAM 428 if (tlp == nqtimerhead.cqh_last) 429 NQSTORENOVRAM(newexpiry); 430 #endif /* HASNVRAM */ 431 if (tlp == (void *)&nqtimerhead) { 432 CIRCLEQ_INSERT_HEAD(&nqtimerhead, lp, lc_timer); 433 } else { 434 CIRCLEQ_INSERT_AFTER(&nqtimerhead, tlp, lp, lc_timer); 435 } 436 } 437 438 /* 439 * Compare the requesting host address with the lph entry in the lease. 440 * Return true iff it is the same. 441 * This is somewhat messy due to the union in the nqhost structure. 442 * The local host is indicated by the special value of NQLOCALSLP for slp. 443 */ 444 static int 445 nqsrv_cmpnam(slp, nam, lph) 446 register struct nfssvc_sock *slp; 447 struct sockaddr *nam; 448 register struct nqhost *lph; 449 { 450 register struct sockaddr_in *saddr; 451 struct sockaddr *addr; 452 union nethostaddr lhaddr; 453 struct socket *nsso; 454 int ret; 455 456 if (slp == NQLOCALSLP) { 457 if (lph->lph_flag & LC_LOCAL) 458 return (1); 459 else 460 return (0); 461 } 462 nsso = slp->ns_so; 463 if (nsso && nsso->so_proto->pr_protocol == IPPROTO_UDP) { 464 addr = nam; 465 } else { 466 addr = slp->ns_nam; 467 } 468 if (lph->lph_flag & LC_UDP) { 469 ret = netaddr_match(AF_INET, &lph->lph_haddr, addr); 470 } else { 471 if ((lph->lph_slp->ns_flag & SLP_VALID) == 0) 472 return (0); 473 saddr = (struct sockaddr_in *)lph->lph_slp->ns_nam; 474 if (saddr->sin_family == AF_INET) 475 lhaddr.had_inetaddr = saddr->sin_addr.s_addr; 476 else 477 lhaddr.had_nam = lph->lph_slp->ns_nam; 478 ret = netaddr_match(saddr->sin_family, &lhaddr, addr); 479 } 480 return (ret); 481 } 482 483 /* 484 * Send out eviction notice messages to all other hosts for the lease. 485 */ 486 static void 487 nqsrv_send_eviction(vp, lp, slp, nam, cred) 488 struct vnode *vp; 489 register struct nqlease *lp; 490 struct nfssvc_sock *slp; 491 struct sockaddr *nam; 492 struct ucred *cred; 493 { 494 register struct nqhost *lph = &lp->lc_host; 495 register int siz; 496 struct nqm *lphnext = lp->lc_morehosts; 497 struct mbuf *m, *mreq, *mb, *mb2, *mheadend; 498 struct sockaddr *nam2; 499 struct sockaddr_in *saddr; 500 nfsfh_t nfh; 501 fhandle_t *fhp; 502 caddr_t bpos, cp; 503 u_int32_t *xidp, *tl; 504 int len = 1, ok = 1, i = 0; 505 506 while (ok && (lph->lph_flag & LC_VALID)) { 507 if (nqsrv_cmpnam(slp, nam, lph)) { 508 lph->lph_flag |= LC_VACATED; 509 } else if ((lph->lph_flag & (LC_LOCAL | LC_VACATED)) == 0) { 510 struct socket *so; 511 int sotype; 512 int *solockp = NULL; 513 514 so = lph->lph_slp->ns_so; 515 if (lph->lph_flag & LC_UDP) { 516 MALLOC(nam2, struct sockaddr *, 517 sizeof *nam2, M_SONAME, M_WAITOK); 518 saddr = (struct sockaddr_in *)nam2; 519 saddr->sin_len = sizeof *saddr; 520 saddr->sin_family = AF_INET; 521 saddr->sin_addr.s_addr = lph->lph_inetaddr; 522 saddr->sin_port = lph->lph_port; 523 } else if (lph->lph_slp->ns_flag & SLP_VALID) { 524 nam2 = (struct sockaddr *)0; 525 } else { 526 goto nextone; 527 } 528 sotype = so->so_type; 529 if (so->so_proto->pr_flags & PR_CONNREQUIRED) 530 solockp = &lph->lph_slp->ns_solock; 531 nfsm_reqhead((struct vnode *)0, NQNFSPROC_EVICTED, 532 NFSX_V3FH + NFSX_UNSIGNED); 533 fhp = &nfh.fh_generic; 534 bzero((caddr_t)fhp, sizeof(nfh)); 535 fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid; 536 VFS_VPTOFH(vp, &fhp->fh_fid); 537 nfsm_srvfhtom(fhp, 1); 538 m = mreq; 539 siz = 0; 540 while (m) { 541 siz += m->m_len; 542 m = m->m_next; 543 } 544 if (siz <= 0 || siz > NFS_MAXPACKET) { 545 printf("mbuf siz=%d\n",siz); 546 panic("Bad nfs svc reply"); 547 } 548 m = nfsm_rpchead(cred, (NFSMNT_NFSV3 | NFSMNT_NQNFS), 549 NQNFSPROC_EVICTED, 550 RPCAUTH_UNIX, 5 * NFSX_UNSIGNED, (char *)0, 551 0, (char *)NULL, mreq, siz, &mheadend, &xidp); 552 /* 553 * For stream protocols, prepend a Sun RPC 554 * Record Mark. 555 */ 556 if (sotype == SOCK_STREAM) { 557 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 558 *mtod(m, u_int32_t *) = htonl(0x80000000 | 559 (m->m_pkthdr.len - NFSX_UNSIGNED)); 560 } 561 /* 562 * nfs_sndlock if PR_CONNREQUIRED XXX 563 */ 564 565 if ((lph->lph_flag & LC_UDP) == 0 && 566 ((lph->lph_slp->ns_flag & SLP_VALID) == 0 || 567 nfs_slplock(lph->lph_slp, 0) == 0)) { 568 m_freem(m); 569 } else { 570 (void) nfs_send(so, nam2, m, 571 (struct nfsreq *)0); 572 if (solockp) 573 nfs_slpunlock(lph->lph_slp); 574 } 575 if (lph->lph_flag & LC_UDP) 576 FREE(nam2, M_SONAME); 577 } 578 nextone: 579 if (++i == len) { 580 if (lphnext) { 581 i = 0; 582 len = LC_MOREHOSTSIZ; 583 lph = lphnext->lpm_hosts; 584 lphnext = lphnext->lpm_next; 585 } else 586 ok = 0; 587 } else 588 lph++; 589 } 590 } 591 592 /* 593 * Wait for the lease to expire. 594 * This will occur when all clients have sent "vacated" messages to 595 * this server OR when it expires do to timeout. 596 */ 597 static void 598 nqsrv_waitfor_expiry(lp) 599 register struct nqlease *lp; 600 { 601 register struct nqhost *lph; 602 register int i; 603 struct nqm *lphnext; 604 int len, ok; 605 606 tryagain: 607 if (time_second > lp->lc_expiry) 608 return; 609 lph = &lp->lc_host; 610 lphnext = lp->lc_morehosts; 611 len = 1; 612 i = 0; 613 ok = 1; 614 while (ok && (lph->lph_flag & LC_VALID)) { 615 if ((lph->lph_flag & (LC_LOCAL | LC_VACATED)) == 0) { 616 lp->lc_flag |= LC_EXPIREDWANTED; 617 (void) tsleep((caddr_t)&lp->lc_flag, PSOCK, 618 "nqexp", 0); 619 goto tryagain; 620 } 621 if (++i == len) { 622 if (lphnext) { 623 i = 0; 624 len = LC_MOREHOSTSIZ; 625 lph = lphnext->lpm_hosts; 626 lphnext = lphnext->lpm_next; 627 } else 628 ok = 0; 629 } else 630 lph++; 631 } 632 } 633 634 /* 635 * Nqnfs server timer that maintains the server lease queue. 636 * Scan the lease queue for expired entries: 637 * - when one is found, wakeup anyone waiting for it 638 * else dequeue and free 639 */ 640 void 641 nqnfs_serverd() 642 { 643 register struct nqlease *lp; 644 register struct nqhost *lph; 645 struct nqlease *nextlp; 646 struct nqm *lphnext, *olphnext; 647 int i, len, ok; 648 649 for (lp = nqtimerhead.cqh_first; lp != (void *)&nqtimerhead; 650 lp = nextlp) { 651 if (lp->lc_expiry >= time_second) 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_SREF) 691 nfsrv_slpderef(lph->lph_slp); 692 if (++i == len) { 693 if (olphnext) { 694 free((caddr_t)olphnext, M_NQMHOST); 695 olphnext = (struct nqm *)0; 696 } 697 if (lphnext) { 698 olphnext = lphnext; 699 i = 0; 700 len = LC_MOREHOSTSIZ; 701 lph = lphnext->lpm_hosts; 702 lphnext = lphnext->lpm_next; 703 } else 704 ok = 0; 705 } else 706 lph++; 707 } 708 FREE((caddr_t)lp, M_NQLEASE); 709 if (olphnext) 710 free((caddr_t)olphnext, M_NQMHOST); 711 nfsstats.srvnqnfs_leases--; 712 } 713 } 714 } 715 } 716 717 /* 718 * Called from nfssvc_nfsd() for a getlease rpc request. 719 * Do the from/to xdr translation and call nqsrv_getlease() to 720 * do the real work. 721 */ 722 int 723 nqnfsrv_getlease(nfsd, slp, procp, mrq) 724 struct nfsrv_descript *nfsd; 725 struct nfssvc_sock *slp; 726 struct proc *procp; 727 struct mbuf **mrq; 728 { 729 struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; 730 struct sockaddr *nam = nfsd->nd_nam; 731 caddr_t dpos = nfsd->nd_dpos; 732 struct ucred *cred = &nfsd->nd_cr; 733 register struct nfs_fattr *fp; 734 struct vattr va; 735 register struct vattr *vap = &va; 736 struct vnode *vp; 737 nfsfh_t nfh; 738 fhandle_t *fhp; 739 register u_int32_t *tl; 740 register int32_t t1; 741 u_quad_t frev; 742 caddr_t bpos; 743 int error = 0; 744 char *cp2; 745 struct mbuf *mb, *mb2, *mreq; 746 int flags, rdonly, cache; 747 748 fhp = &nfh.fh_generic; 749 nfsm_srvmtofh(fhp); 750 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 751 flags = fxdr_unsigned(int, *tl++); 752 nfsd->nd_duration = fxdr_unsigned(int, *tl); 753 error = nfsrv_fhtovp(fhp, 1, &vp, cred, slp, nam, &rdonly, 754 (nfsd->nd_flag & ND_KERBAUTH), TRUE); 755 if (error) { 756 nfsm_reply(0); 757 goto nfsmout; 758 } 759 if (rdonly && flags == ND_WRITE) { 760 error = EROFS; 761 vput(vp); 762 nfsm_reply(0); 763 } 764 (void) nqsrv_getlease(vp, &nfsd->nd_duration, flags, slp, procp, 765 nam, &cache, &frev, cred); 766 error = VOP_GETATTR(vp, vap, cred, procp); 767 vput(vp); 768 nfsm_reply(NFSX_V3FATTR + 4 * NFSX_UNSIGNED); 769 nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED); 770 *tl++ = txdr_unsigned(cache); 771 *tl++ = txdr_unsigned(nfsd->nd_duration); 772 txdr_hyper(frev, tl); 773 nfsm_build(fp, struct nfs_fattr *, NFSX_V3FATTR); 774 nfsm_srvfillattr(vap, fp); 775 nfsm_srvdone; 776 } 777 778 /* 779 * Called from nfssvc_nfsd() when a "vacated" message is received from a 780 * client. Find the entry and expire it. 781 */ 782 int 783 nqnfsrv_vacated(nfsd, slp, procp, mrq) 784 struct nfsrv_descript *nfsd; 785 struct nfssvc_sock *slp; 786 struct proc *procp; 787 struct mbuf **mrq; 788 { 789 struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; 790 struct sockaddr *nam = nfsd->nd_nam; 791 caddr_t dpos = nfsd->nd_dpos; 792 register struct nqlease *lp; 793 register struct nqhost *lph; 794 struct nqlease *tlp = (struct nqlease *)0; 795 nfsfh_t nfh; 796 fhandle_t *fhp; 797 register u_int32_t *tl; 798 register int32_t t1; 799 struct nqm *lphnext; 800 struct mbuf *mreq, *mb; 801 int error = 0, i, len, ok, gotit = 0, cache = 0; 802 char *cp2, *bpos; 803 u_quad_t frev; 804 805 fhp = &nfh.fh_generic; 806 nfsm_srvmtofh(fhp); 807 m_freem(mrep); 808 /* 809 * Find the lease by searching the hash list. 810 */ 811 for (lp = NQFHHASH(fhp->fh_fid.fid_data)->lh_first; lp != 0; 812 lp = lp->lc_hash.le_next) 813 if (fhp->fh_fsid.val[0] == lp->lc_fsid.val[0] && 814 fhp->fh_fsid.val[1] == lp->lc_fsid.val[1] && 815 !bcmp(fhp->fh_fid.fid_data, lp->lc_fiddata, 816 MAXFIDSZ)) { 817 /* Found it */ 818 tlp = lp; 819 break; 820 } 821 if (tlp != 0) { 822 lp = tlp; 823 len = 1; 824 i = 0; 825 lph = &lp->lc_host; 826 lphnext = lp->lc_morehosts; 827 ok = 1; 828 while (ok && (lph->lph_flag & LC_VALID)) { 829 if (nqsrv_cmpnam(slp, nam, lph)) { 830 lph->lph_flag |= LC_VACATED; 831 gotit++; 832 break; 833 } 834 if (++i == len) { 835 if (lphnext) { 836 len = LC_MOREHOSTSIZ; 837 i = 0; 838 lph = lphnext->lpm_hosts; 839 lphnext = lphnext->lpm_next; 840 } else 841 ok = 0; 842 } else 843 lph++; 844 } 845 if ((lp->lc_flag & LC_EXPIREDWANTED) && gotit) { 846 lp->lc_flag &= ~LC_EXPIREDWANTED; 847 wakeup((caddr_t)&lp->lc_flag); 848 } 849 nfsmout: 850 return (EPERM); 851 } 852 return (EPERM); 853 } 854 855 #endif /* NFS_NOSERVER */ 856 857 /* 858 * Client get lease rpc function. 859 */ 860 int 861 nqnfs_getlease(vp, rwflag, cred, p) 862 register struct vnode *vp; 863 int rwflag; 864 struct ucred *cred; 865 struct proc *p; 866 { 867 register u_int32_t *tl; 868 register caddr_t cp; 869 register int32_t t1, t2; 870 register struct nfsnode *np; 871 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 872 caddr_t bpos, dpos, cp2; 873 time_t reqtime; 874 int error = 0; 875 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 876 int cachable; 877 u_quad_t frev; 878 879 nfsstats.rpccnt[NQNFSPROC_GETLEASE]++; 880 mb = mreq = nfsm_reqh(vp, NQNFSPROC_GETLEASE, NFSX_V3FH+2*NFSX_UNSIGNED, 881 &bpos); 882 nfsm_fhtom(vp, 1); 883 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 884 *tl++ = txdr_unsigned(rwflag); 885 *tl = txdr_unsigned(nmp->nm_leaseterm); 886 reqtime = time_second; 887 nfsm_request(vp, NQNFSPROC_GETLEASE, p, cred); 888 np = VTONFS(vp); 889 nfsm_dissect(tl, u_int32_t *, 4 * NFSX_UNSIGNED); 890 cachable = fxdr_unsigned(int, *tl++); 891 reqtime += fxdr_unsigned(int, *tl++); 892 if (reqtime > time_second) { 893 frev = fxdr_hyper(tl); 894 nqnfs_clientlease(nmp, np, rwflag, cachable, reqtime, frev); 895 nfsm_loadattr(vp, (struct vattr *)0); 896 } else 897 error = NQNFS_EXPIRED; 898 nfsm_reqdone; 899 return (error); 900 } 901 902 #ifndef NFS_NOSERVER 903 /* 904 * Client vacated message function. 905 */ 906 static int 907 nqnfs_vacated(vp, cred) 908 register struct vnode *vp; 909 struct ucred *cred; 910 { 911 register caddr_t cp; 912 register int i; 913 register u_int32_t *tl; 914 register int32_t t2; 915 caddr_t bpos; 916 u_int32_t *xidp; 917 int error = 0; 918 struct mbuf *m, *mreq, *mb, *mb2, *mheadend; 919 struct nfsmount *nmp; 920 struct nfsreq myrep; 921 922 nmp = VFSTONFS(vp->v_mount); 923 nfsstats.rpccnt[NQNFSPROC_VACATED]++; 924 nfsm_reqhead(vp, NQNFSPROC_VACATED, NFSX_FH(1)); 925 nfsm_fhtom(vp, 1); 926 m = mreq; 927 i = 0; 928 while (m) { 929 i += m->m_len; 930 m = m->m_next; 931 } 932 m = nfsm_rpchead(cred, nmp->nm_flag, NQNFSPROC_VACATED, 933 RPCAUTH_UNIX, 5 * NFSX_UNSIGNED, (char *)0, 934 0, (char *)NULL, mreq, i, &mheadend, &xidp); 935 if (nmp->nm_sotype == SOCK_STREAM) { 936 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 937 *mtod(m, u_int32_t *) = htonl(0x80000000 | (m->m_pkthdr.len - 938 NFSX_UNSIGNED)); 939 } 940 myrep.r_flags = 0; 941 myrep.r_nmp = nmp; 942 if (nmp->nm_soflags & PR_CONNREQUIRED) 943 (void) nfs_sndlock(&myrep); 944 (void) nfs_send(nmp->nm_so, nmp->nm_nam, m, &myrep); 945 if (nmp->nm_soflags & PR_CONNREQUIRED) 946 nfs_sndunlock(&myrep); 947 nfsmout: 948 return (error); 949 } 950 951 /* 952 * Called for client side callbacks 953 */ 954 int 955 nqnfs_callback(nmp, mrep, md, dpos) 956 struct nfsmount *nmp; 957 struct mbuf *mrep, *md; 958 caddr_t dpos; 959 { 960 register struct vnode *vp; 961 register u_int32_t *tl; 962 register int32_t t1; 963 nfsfh_t nfh; 964 fhandle_t *fhp; 965 struct nfsnode *np; 966 struct nfsd tnfsd; 967 struct nfssvc_sock *slp; 968 struct nfsrv_descript ndesc; 969 register struct nfsrv_descript *nfsd = &ndesc; 970 struct mbuf **mrq = (struct mbuf **)0, *mb, *mreq; 971 int error = 0, cache = 0; 972 char *cp2, *bpos; 973 u_quad_t frev; 974 975 #ifndef nolint 976 slp = NULL; 977 #endif 978 nfsd->nd_mrep = mrep; 979 nfsd->nd_md = md; 980 nfsd->nd_dpos = dpos; 981 error = nfs_getreq(nfsd, &tnfsd, FALSE); 982 if (error) 983 return (error); 984 md = nfsd->nd_md; 985 dpos = nfsd->nd_dpos; 986 if (nfsd->nd_procnum != NQNFSPROC_EVICTED) { 987 m_freem(mrep); 988 return (EPERM); 989 } 990 fhp = &nfh.fh_generic; 991 nfsm_srvmtofh(fhp); 992 m_freem(mrep); 993 error = nfs_nget(nmp->nm_mountp, (nfsfh_t *)fhp, NFSX_V3FH, &np); 994 if (error) 995 return (error); 996 vp = NFSTOV(np); 997 if (np->n_timer.cqe_next != 0) { 998 np->n_expiry = 0; 999 np->n_flag |= NQNFSEVICTED; 1000 if (nmp->nm_timerhead.cqh_first != np) { 1001 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer); 1002 CIRCLEQ_INSERT_HEAD(&nmp->nm_timerhead, np, n_timer); 1003 } 1004 } 1005 vput(vp); 1006 nfsm_srvdone; 1007 } 1008 1009 1010 /* 1011 * Nqnfs client helper daemon. Runs once a second to expire leases. 1012 * It also get authorization strings for "kerb" mounts. 1013 * It must start at the beginning of the list again after any potential 1014 * "sleep" since nfs_reclaim() called from vclean() can pull a node off 1015 * the list asynchronously. 1016 */ 1017 int 1018 nqnfs_clientd(nmp, cred, ncd, flag, argp, p) 1019 register struct nfsmount *nmp; 1020 struct ucred *cred; 1021 struct nfsd_cargs *ncd; 1022 int flag; 1023 caddr_t argp; 1024 struct proc *p; 1025 { 1026 register struct nfsnode *np; 1027 struct vnode *vp; 1028 struct nfsreq myrep; 1029 struct nfsuid *nuidp, *nnuidp; 1030 int error = 0, vpid; 1031 1032 /* 1033 * First initialize some variables 1034 */ 1035 1036 /* 1037 * If an authorization string is being passed in, get it. 1038 */ 1039 if ((flag & NFSSVC_GOTAUTH) && 1040 (nmp->nm_state & (NFSSTA_WAITAUTH | NFSSTA_DISMNT)) == 0) { 1041 if (nmp->nm_state & NFSSTA_HASAUTH) 1042 panic("cld kerb"); 1043 if ((flag & NFSSVC_AUTHINFAIL) == 0) { 1044 if (ncd->ncd_authlen <= nmp->nm_authlen && 1045 ncd->ncd_verflen <= nmp->nm_verflen && 1046 !copyin(ncd->ncd_authstr,nmp->nm_authstr,ncd->ncd_authlen)&& 1047 !copyin(ncd->ncd_verfstr,nmp->nm_verfstr,ncd->ncd_verflen)){ 1048 nmp->nm_authtype = ncd->ncd_authtype; 1049 nmp->nm_authlen = ncd->ncd_authlen; 1050 nmp->nm_verflen = ncd->ncd_verflen; 1051 #ifdef NFSKERB 1052 nmp->nm_key = ncd->ncd_key; 1053 #endif 1054 } else 1055 nmp->nm_state |= NFSSTA_AUTHERR; 1056 } else 1057 nmp->nm_state |= NFSSTA_AUTHERR; 1058 nmp->nm_state |= NFSSTA_HASAUTH; 1059 wakeup((caddr_t)&nmp->nm_authlen); 1060 } else 1061 nmp->nm_state |= NFSSTA_WAITAUTH; 1062 1063 /* 1064 * Loop every second updating queue until there is a termination sig. 1065 */ 1066 while ((nmp->nm_state & NFSSTA_DISMNT) == 0) { 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 (nfs_reqq.tqh_first == 0 && 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_procp = (struct proc *)0; 1079 (void) nfs_reply(&myrep); 1080 } 1081 1082 /* 1083 * Loop through the leases, updating as required. 1084 */ 1085 np = nmp->nm_timerhead.cqh_first; 1086 while (np != (void *)&nmp->nm_timerhead && 1087 (nmp->nm_state & NFSSTA_DISMINPROG) == 0) { 1088 vp = NFSTOV(np); 1089 vpid = vp->v_id; 1090 if (np->n_expiry < time_second) { 1091 if (vget(vp, LK_EXCLUSIVE, p) == 0) { 1092 nmp->nm_inprog = vp; 1093 if (vpid == vp->v_id) { 1094 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer); 1095 np->n_timer.cqe_next = 0; 1096 if (np->n_flag & (NMODIFIED | NQNFSEVICTED)) { 1097 if (np->n_flag & NQNFSEVICTED) { 1098 if (vp->v_type == VDIR) 1099 nfs_invaldir(vp); 1100 cache_purge(vp); 1101 (void) nfs_vinvalbuf(vp, 1102 V_SAVE, cred, p, 0); 1103 np->n_flag &= ~NQNFSEVICTED; 1104 (void) nqnfs_vacated(vp, cred); 1105 } else if (vp->v_type == VREG) { 1106 (void) VOP_FSYNC(vp, cred, 1107 MNT_WAIT, p); 1108 np->n_flag &= ~NMODIFIED; 1109 } 1110 } 1111 } 1112 vput(vp); 1113 nmp->nm_inprog = NULLVP; 1114 } 1115 } else if ((np->n_expiry - NQ_RENEWAL) < time_second) { 1116 if ((np->n_flag & (NQNFSWRITE | NQNFSNONCACHE)) 1117 == NQNFSWRITE && 1118 !TAILQ_EMPTY(&vp->v_dirtyblkhd) && 1119 vget(vp, LK_EXCLUSIVE, p) == 0) { 1120 nmp->nm_inprog = vp; 1121 if (vpid == vp->v_id && 1122 nqnfs_getlease(vp, ND_WRITE, cred, p)==0) 1123 np->n_brev = np->n_lrev; 1124 vput(vp); 1125 nmp->nm_inprog = NULLVP; 1126 } 1127 } else 1128 break; 1129 if (np == nmp->nm_timerhead.cqh_first) 1130 break; 1131 np = nmp->nm_timerhead.cqh_first; 1132 } 1133 } 1134 1135 /* 1136 * Get an authorization string, if required. 1137 */ 1138 if ((nmp->nm_state & (NFSSTA_WAITAUTH | NFSSTA_DISMNT | NFSSTA_HASAUTH)) == 0) { 1139 ncd->ncd_authuid = nmp->nm_authuid; 1140 if (copyout((caddr_t)ncd, argp, sizeof (struct nfsd_cargs))) 1141 nmp->nm_state |= NFSSTA_WAITAUTH; 1142 else 1143 return (ENEEDAUTH); 1144 } 1145 1146 /* 1147 * Wait a bit (no pun) and do it again. 1148 */ 1149 if ((nmp->nm_state & NFSSTA_DISMNT) == 0 && 1150 (nmp->nm_state & (NFSSTA_WAITAUTH | NFSSTA_HASAUTH))) { 1151 error = tsleep((caddr_t)&nmp->nm_authstr, PSOCK | PCATCH, 1152 "nqnfstimr", hz / 3); 1153 if (error == EINTR || error == ERESTART) 1154 (void) dounmount(nmp->nm_mountp, 0, p); 1155 } 1156 } 1157 1158 /* 1159 * Finally, we can free up the mount structure. 1160 */ 1161 for (nuidp = nmp->nm_uidlruhead.tqh_first; nuidp != 0; nuidp = nnuidp) { 1162 nnuidp = nuidp->nu_lru.tqe_next; 1163 LIST_REMOVE(nuidp, nu_hash); 1164 TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru); 1165 free((caddr_t)nuidp, M_NFSUID); 1166 } 1167 zfree(nfsmount_zone, nmp); 1168 if (error == EWOULDBLOCK) 1169 error = 0; 1170 return (error); 1171 } 1172 1173 #endif /* NFS_NOSERVER */ 1174 1175 /* 1176 * Adjust all timer queue expiry times when the time of day clock is changed. 1177 * Called from the settimeofday() syscall. 1178 */ 1179 void 1180 nqnfs_lease_updatetime(deltat) 1181 register int deltat; 1182 { 1183 struct proc *p = curproc; /* XXX */ 1184 struct nqlease *lp; 1185 struct nfsnode *np; 1186 struct mount *mp, *nxtmp; 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 simple_lock(&mountlist_slock); 1203 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nxtmp) { 1204 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock, p)) { 1205 nxtmp = TAILQ_NEXT(mp, mnt_list); 1206 continue; 1207 } 1208 if (mp->mnt_stat.f_type == nfs_mount_type) { 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 simple_lock(&mountlist_slock); 1219 nxtmp = TAILQ_NEXT(mp, mnt_list); 1220 vfs_unbusy(mp, p); 1221 } 1222 simple_unlock(&mountlist_slock); 1223 } 1224 1225 #ifndef NFS_NOSERVER 1226 /* 1227 * Lock a server lease. 1228 */ 1229 static void 1230 nqsrv_locklease(lp) 1231 struct nqlease *lp; 1232 { 1233 1234 while (lp->lc_flag & LC_LOCKED) { 1235 lp->lc_flag |= LC_WANTED; 1236 (void) tsleep((caddr_t)lp, PSOCK, "nqlc", 0); 1237 } 1238 lp->lc_flag |= LC_LOCKED; 1239 lp->lc_flag &= ~LC_WANTED; 1240 } 1241 1242 /* 1243 * Unlock a server lease. 1244 */ 1245 static void 1246 nqsrv_unlocklease(lp) 1247 struct nqlease *lp; 1248 { 1249 1250 lp->lc_flag &= ~LC_LOCKED; 1251 if (lp->lc_flag & LC_WANTED) 1252 wakeup((caddr_t)lp); 1253 } 1254 #endif /* NFS_NOSERVER */ 1255 1256 /* 1257 * Update a client lease. 1258 */ 1259 void 1260 nqnfs_clientlease(nmp, np, rwflag, cachable, expiry, frev) 1261 register struct nfsmount *nmp; 1262 register struct nfsnode *np; 1263 int rwflag, cachable; 1264 time_t expiry; 1265 u_quad_t frev; 1266 { 1267 register struct nfsnode *tp; 1268 1269 if (np->n_timer.cqe_next != 0) { 1270 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer); 1271 if (rwflag == ND_WRITE) 1272 np->n_flag |= NQNFSWRITE; 1273 } else if (rwflag == ND_READ) 1274 np->n_flag &= ~NQNFSWRITE; 1275 else 1276 np->n_flag |= NQNFSWRITE; 1277 if (cachable) 1278 np->n_flag &= ~NQNFSNONCACHE; 1279 else 1280 np->n_flag |= NQNFSNONCACHE; 1281 np->n_expiry = expiry; 1282 np->n_lrev = frev; 1283 tp = nmp->nm_timerhead.cqh_last; 1284 while (tp != (void *)&nmp->nm_timerhead && tp->n_expiry > np->n_expiry) 1285 tp = tp->n_timer.cqe_prev; 1286 if (tp == (void *)&nmp->nm_timerhead) { 1287 CIRCLEQ_INSERT_HEAD(&nmp->nm_timerhead, np, n_timer); 1288 } else { 1289 CIRCLEQ_INSERT_AFTER(&nmp->nm_timerhead, tp, np, n_timer); 1290 } 1291 }
Cache object: 0a58dee8f3bfc27a02ba2191bda9d131
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