Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/nfs/nfs_nqlease.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /* $NetBSD: nfs_nqlease.c,v 1.56 2004/05/22 22:52:15 jonathan 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 1.56 2004/05/22 22:52:15 jonathan 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_fsidx; 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.__fsid_val[0] == lp->lc_fsid.__fsid_val[0] && 216 fh.fh_fsid.__fsid_val[1] == lp->lc_fsid.__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, procp); 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, p) 457 struct vnode *vp; 458 struct nqlease *lp; 459 struct nfssvc_sock *slp; 460 struct mbuf *nam; 461 struct ucred *cred; 462 struct proc *p; 463 { 464 struct nqhost *lph = &lp->lc_host; 465 struct mbuf *m; 466 int siz; 467 struct nqm *lphnext = lp->lc_morehosts; 468 struct mbuf *mreq, *mb, *nam2, *mheadend; 469 struct socket *so; 470 struct sockaddr_in *saddr; 471 nfsfh_t nfh; 472 fhandle_t *fhp; 473 caddr_t bpos, cp; 474 u_int32_t xid, *tl; 475 int len = 1, ok = 1, i = 0; 476 int sotype, *solockp; 477 478 while (ok && (lph->lph_flag & LC_VALID)) { 479 if (nqsrv_cmpnam(slp, nam, lph)) 480 lph->lph_flag |= LC_VACATED; 481 else if ((lph->lph_flag & (LC_LOCAL | LC_VACATED)) == 0) { 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 fhp = &nfh.fh_generic; 517 memset((caddr_t)fhp, 0, sizeof(nfh)); 518 fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsidx; 519 VFS_VPTOFH(vp, &fhp->fh_fid); 520 nfsm_srvfhtom(fhp, 1); 521 m = mreq; 522 siz = 0; 523 while (m) { 524 siz += m->m_len; 525 m = m->m_next; 526 } 527 if (siz <= 0 || siz > NFS_MAXPACKET) { 528 printf("mbuf siz=%d\n",siz); 529 panic("Bad nfs svc reply"); 530 } 531 m = nfsm_rpchead(cred, (NFSMNT_NFSV3 | NFSMNT_NQNFS), 532 NQNFSPROC_EVICTED, 533 RPCAUTH_UNIX, 5 * NFSX_UNSIGNED, (char *)0, 534 0, (char *)0, mreq, siz, &mheadend, &xid); 535 /* 536 * For stream protocols, prepend a Sun RPC 537 * Record Mark. 538 */ 539 if (sotype == SOCK_STREAM) { 540 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 541 *mtod(m, u_int32_t *) = htonl(0x80000000 | 542 (m->m_pkthdr.len - NFSX_UNSIGNED)); 543 } 544 if (((lph->lph_flag & (LC_UDP | LC_CLTP | LC_UDP6)) 545 == 0 && 546 (lph->lph_slp->ns_flag & SLP_VALID) == 0) || 547 (solockp && (*solockp & NFSMNT_SNDLOCK))) 548 m_freem(m); 549 else { 550 if (solockp) 551 *solockp |= NFSMNT_SNDLOCK; 552 (void) nfs_send(so, nam2, m, 553 (struct nfsreq *)0, p); 554 if (solockp) 555 nfs_sndunlock(solockp); 556 } 557 if (lph->lph_flag & LC_UDP) 558 (void) m_free(nam2); 559 } 560 nextone: 561 if (++i == len) { 562 if (lphnext) { 563 i = 0; 564 len = LC_MOREHOSTSIZ; 565 lph = lphnext->lpm_hosts; 566 lphnext = lphnext->lpm_next; 567 } else 568 ok = 0; 569 } else 570 lph++; 571 } 572 } 573 574 /* 575 * Wait for the lease to expire. 576 * This will occur when all clients have sent "vacated" messages to 577 * this server OR when it expires do to timeout. 578 */ 579 void 580 nqsrv_waitfor_expiry(lp) 581 struct nqlease *lp; 582 { 583 struct nqhost *lph; 584 int i; 585 struct nqm *lphnext; 586 int len, ok; 587 588 tryagain: 589 if (time.tv_sec > lp->lc_expiry) 590 return; 591 lph = &lp->lc_host; 592 lphnext = lp->lc_morehosts; 593 len = 1; 594 i = 0; 595 ok = 1; 596 while (ok && (lph->lph_flag & LC_VALID)) { 597 if ((lph->lph_flag & (LC_LOCAL | LC_VACATED)) == 0) { 598 lp->lc_flag |= LC_EXPIREDWANTED; 599 (void) tsleep((caddr_t)&lp->lc_flag, PSOCK, 600 "nqexp", 0); 601 goto tryagain; 602 } 603 if (++i == len) { 604 if (lphnext) { 605 i = 0; 606 len = LC_MOREHOSTSIZ; 607 lph = lphnext->lpm_hosts; 608 lphnext = lphnext->lpm_next; 609 } else 610 ok = 0; 611 } else 612 lph++; 613 } 614 } 615 #endif /* NFSSERVER || (NFS && !NFS_V2_ONLY) */ 616 617 #ifdef NFSSERVER 618 /* 619 * Nqnfs server timer that maintains the server lease queue. 620 * Scan the lease queue for expired entries: 621 * - when one is found, wakeup anyone waiting for it 622 * else dequeue and free 623 */ 624 void 625 nqnfs_serverd() 626 { 627 struct nqlease *lp; 628 struct nqhost *lph; 629 struct nqlease *nextlp; 630 struct nqm *lphnext, *olphnext; 631 int i, len, ok; 632 633 for (lp = CIRCLEQ_FIRST(&nqtimerhead); lp != (void *)&nqtimerhead; 634 lp = nextlp) { 635 if (lp->lc_expiry >= time.tv_sec) 636 break; 637 nextlp = CIRCLEQ_NEXT(lp, lc_timer); 638 if (lp->lc_flag & LC_EXPIREDWANTED) { 639 lp->lc_flag &= ~LC_EXPIREDWANTED; 640 wakeup((caddr_t)&lp->lc_flag); 641 } else if ((lp->lc_flag & (LC_LOCKED | LC_WANTED)) == 0) { 642 /* 643 * Make a best effort at keeping a write caching lease long 644 * enough by not deleting it until it has been explicitly 645 * vacated or there have been no writes in the previous 646 * write_slack seconds since expiry and the nfsds are not 647 * all busy. The assumption is that if the nfsds are not 648 * all busy now (no queue of nfs requests), then the client 649 * would have been able to do at least one write to the 650 * file during the last write_slack seconds if it was still 651 * trying to push writes to the server. 652 */ 653 if ((lp->lc_flag & (LC_WRITE | LC_VACATED)) == LC_WRITE && 654 ((lp->lc_flag & LC_WRITTEN) || nfsd_waiting == 0)) { 655 lp->lc_flag &= ~LC_WRITTEN; 656 nqsrv_instimeq(lp, nqsrv_writeslack); 657 } else { 658 CIRCLEQ_REMOVE(&nqtimerhead, lp, lc_timer); 659 LIST_REMOVE(lp, lc_hash); 660 /* 661 * This soft reference may no longer be valid, but 662 * no harm done. The worst case is if the vnode was 663 * recycled and has another valid lease reference, 664 * which is dereferenced prematurely. 665 */ 666 lp->lc_vp->v_lease = (struct nqlease *)0; 667 lph = &lp->lc_host; 668 lphnext = lp->lc_morehosts; 669 olphnext = (struct nqm *)0; 670 len = 1; 671 i = 0; 672 ok = 1; 673 while (ok && (lph->lph_flag & LC_VALID)) { 674 if (lph->lph_flag & (LC_CLTP | LC_UDP6)) 675 (void) m_free(lph->lph_nam); 676 if (lph->lph_flag & LC_SREF) 677 nfsrv_slpderef(lph->lph_slp); 678 if (++i == len) { 679 if (olphnext) { 680 free((caddr_t)olphnext, M_NQMHOST); 681 olphnext = (struct nqm *)0; 682 } 683 if (lphnext) { 684 olphnext = lphnext; 685 i = 0; 686 len = LC_MOREHOSTSIZ; 687 lph = lphnext->lpm_hosts; 688 lphnext = lphnext->lpm_next; 689 } else 690 ok = 0; 691 } else 692 lph++; 693 } 694 FREE((caddr_t)lp, M_NQLEASE); 695 if (olphnext) 696 free((caddr_t)olphnext, M_NQMHOST); 697 nfsstats.srvnqnfs_leases--; 698 } 699 } 700 } 701 } 702 703 /* 704 * Called from nfssvc_nfsd() for a getlease rpc request. 705 * Do the from/to xdr translation and call nqsrv_getlease() to 706 * do the real work. 707 */ 708 int 709 nqnfsrv_getlease(nfsd, slp, procp, mrq) 710 struct nfsrv_descript *nfsd; 711 struct nfssvc_sock *slp; 712 struct proc *procp; 713 struct mbuf **mrq; 714 { 715 struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; 716 struct mbuf *nam = nfsd->nd_nam; 717 caddr_t dpos = nfsd->nd_dpos; 718 struct ucred *cred = &nfsd->nd_cr; 719 struct nfs_fattr *fp; 720 struct vattr va; 721 struct vnode *vp; 722 nfsfh_t nfh; 723 fhandle_t *fhp; 724 u_int32_t *tl; 725 int32_t t1; 726 u_quad_t frev; 727 caddr_t bpos; 728 int error = 0; 729 char *cp2; 730 struct mbuf *mb, *mreq; 731 int flags, rdonly, cache; 732 733 fhp = &nfh.fh_generic; 734 nfsm_srvmtofh(fhp); 735 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 736 flags = fxdr_unsigned(int, *tl++); 737 nfsd->nd_duration = fxdr_unsigned(int, *tl); 738 error = nfsrv_fhtovp(fhp, 1, &vp, cred, slp, nam, &rdonly, 739 (nfsd->nd_flag & ND_KERBAUTH), FALSE); 740 if (error) { 741 nfsm_reply(0); 742 return 0; 743 } 744 if (rdonly && flags == ND_WRITE) { 745 vput(vp); 746 error = EROFS; 747 nfsm_reply(0); 748 return 0; 749 } 750 (void) nqsrv_getlease(vp, &nfsd->nd_duration, flags, slp, procp, 751 nam, &cache, &frev, cred); 752 error = VOP_GETATTR(vp, &va, cred, procp); 753 vput(vp); 754 nfsm_reply(NFSX_V3FATTR + 4 * NFSX_UNSIGNED); 755 nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED); 756 *tl++ = txdr_unsigned(cache); 757 *tl++ = txdr_unsigned(nfsd->nd_duration); 758 txdr_hyper(frev, tl); 759 nfsm_build(fp, struct nfs_fattr *, NFSX_V3FATTR); 760 nfsm_srvfillattr(&va, fp); 761 nfsm_srvdone; 762 } 763 764 /* 765 * Called from nfssvc_nfsd() when a "vacated" message is received from a 766 * client. Find the entry and expire it. 767 */ 768 int 769 nqnfsrv_vacated(nfsd, slp, procp, mrq) 770 struct nfsrv_descript *nfsd; 771 struct nfssvc_sock *slp; 772 struct proc *procp; 773 struct mbuf **mrq; 774 { 775 struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; 776 struct mbuf *nam = nfsd->nd_nam; 777 caddr_t dpos = nfsd->nd_dpos; 778 struct nqlease *lp; 779 struct nqhost *lph; 780 struct nqlease *tlp = (struct nqlease *)0; 781 nfsfh_t nfh; 782 fhandle_t *fhp; 783 u_int32_t *tl; 784 int32_t t1; 785 struct nqm *lphnext; 786 struct mbuf *mreq, *mb; 787 int error = 0, i, len, ok, gotit = 0, cache = 0; 788 char *cp2, *bpos; 789 u_quad_t frev; 790 791 fhp = &nfh.fh_generic; 792 nfsm_srvmtofh(fhp); 793 m_freem(mrep); 794 /* 795 * Find the lease by searching the hash list. 796 */ 797 LIST_FOREACH(lp, NQFHHASH(fhp->fh_fid.fid_data), lc_hash) { 798 if (fhp->fh_fsid.__fsid_val[0] == lp->lc_fsid.__fsid_val[0] && 799 fhp->fh_fsid.__fsid_val[1] == lp->lc_fsid.__fsid_val[1] && 800 !memcmp(fhp->fh_fid.fid_data, lp->lc_fiddata, 801 VFS_MAXFIDSZ)) { 802 /* Found it */ 803 tlp = lp; 804 break; 805 } 806 } 807 if (tlp != 0) { 808 lp = tlp; 809 len = 1; 810 i = 0; 811 lph = &lp->lc_host; 812 lphnext = lp->lc_morehosts; 813 ok = 1; 814 while (ok && (lph->lph_flag & LC_VALID)) { 815 if (nqsrv_cmpnam(slp, nam, lph)) { 816 lph->lph_flag |= LC_VACATED; 817 gotit++; 818 break; 819 } 820 if (++i == len) { 821 if (lphnext) { 822 len = LC_MOREHOSTSIZ; 823 i = 0; 824 lph = lphnext->lpm_hosts; 825 lphnext = lphnext->lpm_next; 826 } else 827 ok = 0; 828 } else 829 lph++; 830 } 831 if ((lp->lc_flag & LC_EXPIREDWANTED) && gotit) { 832 lp->lc_flag &= ~LC_EXPIREDWANTED; 833 wakeup((caddr_t)&lp->lc_flag); 834 } 835 nfsmout: 836 return (EPERM); 837 } 838 return (EPERM); 839 } 840 #endif /* NFSSERVER */ 841 842 #if defined(NFS) && !defined(NFS_V2_ONLY) 843 /* 844 * Client get lease rpc function. 845 */ 846 int 847 nqnfs_getlease(vp, rwflag, cred, p) 848 struct vnode *vp; 849 int rwflag; 850 struct ucred *cred; 851 struct proc *p; 852 { 853 u_int32_t *tl; 854 caddr_t cp; 855 int32_t t1, t2; 856 struct nfsnode *np; 857 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 858 caddr_t bpos, dpos, cp2; 859 time_t reqtime; 860 int error = 0; 861 struct mbuf *mreq, *mrep, *md, *mb; 862 int cachable; 863 u_quad_t frev; 864 865 nfsstats.rpccnt[NQNFSPROC_GETLEASE]++; 866 np = VTONFS(vp); 867 mb = mreq = nfsm_reqh(np, NQNFSPROC_GETLEASE, NFSX_V3FH+2*NFSX_UNSIGNED, 868 &bpos); 869 nfsm_fhtom(np, 1); 870 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 871 *tl++ = txdr_unsigned(rwflag); 872 *tl = txdr_unsigned(nmp->nm_leaseterm); 873 reqtime = time.tv_sec; 874 nfsm_request(np, NQNFSPROC_GETLEASE, p, cred); 875 nfsm_dissect(tl, u_int32_t *, 4 * NFSX_UNSIGNED); 876 cachable = fxdr_unsigned(int, *tl++); 877 reqtime += fxdr_unsigned(int, *tl++); 878 if (reqtime > time.tv_sec) { 879 frev = fxdr_hyper(tl); 880 nqnfs_clientlease(nmp, np, rwflag, cachable, reqtime, frev); 881 nfsm_loadattr(vp, (struct vattr *)0, 0); 882 } else 883 error = NQNFS_EXPIRED; 884 nfsm_reqdone; 885 return (error); 886 } 887 888 /* 889 * Client vacated message function. 890 */ 891 int 892 nqnfs_vacated(vp, cred, p) 893 struct vnode *vp; 894 struct ucred *cred; 895 struct proc *p; 896 { 897 caddr_t cp; 898 struct mbuf *m; 899 int i; 900 u_int32_t *tl; 901 int32_t t2; 902 caddr_t bpos; 903 u_int32_t xid; 904 int error = 0; 905 struct mbuf *mreq, *mb, *mheadend; 906 struct nfsmount *nmp; 907 struct nfsreq myrep; 908 struct nfsnode *np = VTONFS(vp); 909 910 nmp = VFSTONFS(vp->v_mount); 911 nfsstats.rpccnt[NQNFSPROC_VACATED]++; 912 nfsm_reqhead(np, NQNFSPROC_VACATED, NFSX_FH(1)); 913 nfsm_fhtom(np, 1); 914 m = mreq; 915 i = 0; 916 while (m) { 917 i += m->m_len; 918 m = m->m_next; 919 } 920 m = nfsm_rpchead(cred, nmp->nm_flag, NQNFSPROC_VACATED, 921 RPCAUTH_UNIX, 5 * NFSX_UNSIGNED, (char *)0, 922 0, (char *)0, mreq, i, &mheadend, &xid); 923 if (nmp->nm_sotype == SOCK_STREAM) { 924 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 925 *mtod(m, u_int32_t *) = htonl(0x80000000 | (m->m_pkthdr.len - 926 NFSX_UNSIGNED)); 927 } 928 myrep.r_flags = 0; 929 myrep.r_nmp = nmp; 930 if (nmp->nm_soflags & PR_CONNREQUIRED) 931 (void) nfs_sndlock(&nmp->nm_iflag, (struct nfsreq *)0); 932 (void) nfs_send(nmp->nm_so, nmp->nm_nam, m, &myrep, p); 933 if (nmp->nm_soflags & PR_CONNREQUIRED) 934 nfs_sndunlock(&nmp->nm_iflag); 935 nfsmout: 936 return (error); 937 } 938 939 /* 940 * Called for client side callbacks 941 */ 942 int 943 nqnfs_callback(nmp, mrep, md, dpos) 944 struct nfsmount *nmp; 945 struct mbuf *mrep, *md; 946 caddr_t dpos; 947 { 948 struct vnode *vp; 949 u_int32_t *tl; 950 int32_t t1; 951 nfsfh_t nfh; 952 fhandle_t *fhp; 953 struct nfsnode *np; 954 struct nfsd tnfsd; 955 struct nfssvc_sock *slp; 956 struct nfsrv_descript ndesc; 957 struct nfsrv_descript *nfsd = &ndesc; 958 struct mbuf **mrq = (struct mbuf **)0, *mb, *mreq; 959 int error = 0, cache = 0; 960 char *cp2, *bpos; 961 u_quad_t frev; 962 963 #ifndef nolint 964 slp = NULL; 965 #endif 966 nfsd->nd_mrep = mrep; 967 nfsd->nd_md = md; 968 nfsd->nd_dpos = dpos; 969 error = nfs_getreq(nfsd, &tnfsd, FALSE); 970 if (error) 971 return (error); 972 md = nfsd->nd_md; 973 dpos = nfsd->nd_dpos; 974 if (nfsd->nd_procnum != NQNFSPROC_EVICTED) { 975 m_freem(mrep); 976 return (EPERM); 977 } 978 fhp = &nfh.fh_generic; 979 nfsm_srvmtofh(fhp); 980 m_freem(mrep); 981 error = nfs_nget(nmp->nm_mountp, (nfsfh_t *)fhp, NFSX_V3FH, &np); 982 if (error) 983 return (error); 984 vp = NFSTOV(np); 985 if (CIRCLEQ_NEXT(np, n_timer) != 0) { 986 np->n_expiry = 0; 987 np->n_flag |= NQNFSEVICTED; 988 if (CIRCLEQ_FIRST(&nmp->nm_timerhead) != np) { 989 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer); 990 CIRCLEQ_INSERT_HEAD(&nmp->nm_timerhead, np, n_timer); 991 } 992 } 993 vput(vp); 994 nfsm_srvdone; 995 } 996 #endif /* NFS && !NFS_V2_ONLY */ 997 998 #ifdef NFS /* Needed in V2_ONLY case for Kerberos stuff */ 999 /* 1000 * Nqnfs client helper daemon. Runs once a second to expire leases. 1001 * It also get authorization strings for "kerb" mounts. 1002 * It must start at the beginning of the list again after any potential 1003 * "sleep" since nfs_reclaim() called from vclean() can pull a node off 1004 * the list asynchronously. 1005 */ 1006 int 1007 nqnfs_clientd(nmp, cred, ncd, flag, argp, l) 1008 struct nfsmount *nmp; 1009 struct ucred *cred; 1010 struct nfsd_cargs *ncd; 1011 int flag; 1012 caddr_t argp; 1013 struct lwp *l; 1014 { 1015 struct proc *p = l->l_proc; 1016 #ifndef NFS_V2_ONLY 1017 struct nfsnode *np; 1018 struct vnode *vp; 1019 struct nfsreq myrep; 1020 #endif 1021 int error = 0, sleepreturn; 1022 struct nfsuid *nuidp, *nnuidp; 1023 1024 /* 1025 * First initialize some variables 1026 */ 1027 1028 /* 1029 * If an authorization string is being passed in, get it. 1030 */ 1031 if ((flag & NFSSVC_GOTAUTH) && 1032 (nmp->nm_iflag & (NFSMNT_WAITAUTH | NFSMNT_DISMNT)) == 0) { 1033 if (nmp->nm_iflag & NFSMNT_HASAUTH) 1034 panic("cld kerb"); 1035 if ((flag & NFSSVC_AUTHINFAIL) == 0) { 1036 if (ncd->ncd_authlen <= nmp->nm_authlen && 1037 ncd->ncd_verflen <= nmp->nm_verflen && 1038 !copyin(ncd->ncd_authstr,nmp->nm_authstr,ncd->ncd_authlen)&& 1039 !copyin(ncd->ncd_verfstr,nmp->nm_verfstr,ncd->ncd_verflen)){ 1040 nmp->nm_authtype = ncd->ncd_authtype; 1041 nmp->nm_authlen = ncd->ncd_authlen; 1042 nmp->nm_verflen = ncd->ncd_verflen; 1043 #ifdef NFSKERB 1044 nmp->nm_key = ncd->ncd_key; 1045 #endif 1046 } else 1047 nmp->nm_iflag |= NFSMNT_AUTHERR; 1048 } else 1049 nmp->nm_iflag |= NFSMNT_AUTHERR; 1050 nmp->nm_iflag |= NFSMNT_HASAUTH; 1051 wakeup((caddr_t)&nmp->nm_authlen); 1052 } else 1053 nmp->nm_iflag |= NFSMNT_WAITAUTH; 1054 1055 /* 1056 * Loop every second updating queue until there is a termination sig. 1057 */ 1058 sleepreturn = 0; 1059 while ((nmp->nm_iflag & NFSMNT_DISMNT) == 0) { 1060 if (sleepreturn == EINTR || sleepreturn == ERESTART) { 1061 /* 1062 * XXX Freeze syncer. Must do this before locking 1063 * the mount point. See dounmount() for details. 1064 */ 1065 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 1066 if (vfs_busy(nmp->nm_mountp, LK_NOWAIT, 0) != 0) 1067 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 1068 else if (dounmount(nmp->nm_mountp, 0, p) != 0) 1069 CLRSIG(p, CURSIG(l)); 1070 sleepreturn = 0; 1071 continue; 1072 } 1073 #ifndef NFS_V2_ONLY 1074 if (nmp->nm_flag & NFSMNT_NQNFS) { 1075 /* 1076 * If there are no outstanding requests (and therefore no 1077 * processes in nfs_reply) and there is data in the receive 1078 * queue, poke for callbacks. 1079 */ 1080 if (TAILQ_EMPTY(&nfs_reqq) && nmp->nm_so && 1081 nmp->nm_so->so_rcv.sb_cc > 0) { 1082 myrep.r_flags = R_GETONEREP; 1083 myrep.r_nmp = nmp; 1084 myrep.r_mrep = (struct mbuf *)0; 1085 myrep.r_procp = (struct proc *)0; 1086 (void) nfs_reply(&myrep, p); 1087 } 1088 1089 /* 1090 * Loop through the leases, updating as required. 1091 */ 1092 np = CIRCLEQ_FIRST(&nmp->nm_timerhead); 1093 while (np != (void *)&nmp->nm_timerhead && 1094 (nmp->nm_iflag & NFSMNT_DISMINPROG) == 0) { 1095 vp = NFSTOV(np); 1096 if (np->n_expiry < time.tv_sec) { 1097 if (vget(vp, LK_EXCLUSIVE) == 0) { 1098 nmp->nm_inprog = vp; 1099 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer); 1100 /* mark this off the list */ 1101 CIRCLEQ_NEXT(np, n_timer) = 0; /* XXX */ 1102 if (np->n_flag & (NMODIFIED | NQNFSEVICTED)) { 1103 if (np->n_flag & NQNFSEVICTED) { 1104 if (vp->v_type == VDIR) 1105 nfs_invaldircache(vp,0); 1106 cache_purge(vp); 1107 (void) nfs_vinvalbuf(vp, 1108 V_SAVE, cred, p, 0); 1109 np->n_flag &= ~NQNFSEVICTED; 1110 (void) nqnfs_vacated(vp, cred, p); 1111 } else if (vp->v_type == VREG) { 1112 (void) VOP_FSYNC(vp, cred, 1113 FSYNC_WAIT, 0, 0, p); 1114 np->n_flag &= ~NMODIFIED; 1115 } 1116 } 1117 vput(vp); 1118 nmp->nm_inprog = NULLVP; 1119 } 1120 } else if ((np->n_expiry - NQ_RENEWAL) < time.tv_sec) { 1121 if ((np->n_flag & (NQNFSWRITE | NQNFSNONCACHE)) 1122 == NQNFSWRITE && 1123 !LIST_EMPTY(&vp->v_dirtyblkhd) && 1124 vget(vp, LK_EXCLUSIVE) == 0) { 1125 nmp->nm_inprog = vp; 1126 if (nqnfs_getlease(vp, ND_WRITE, cred, p)==0) 1127 np->n_brev = np->n_lrev; 1128 vput(vp); 1129 nmp->nm_inprog = NULLVP; 1130 } 1131 } else 1132 break; 1133 if (np == CIRCLEQ_FIRST(&nmp->nm_timerhead)) 1134 break; 1135 np = CIRCLEQ_FIRST(&nmp->nm_timerhead); 1136 } 1137 } 1138 #endif /* !NFS_V2_ONLY */ 1139 1140 /* 1141 * Get an authorization string, if required. 1142 */ 1143 if ((nmp->nm_iflag & (NFSMNT_WAITAUTH | NFSMNT_DISMNT | NFSMNT_HASAUTH)) == 0) { 1144 ncd->ncd_authuid = nmp->nm_authuid; 1145 if (copyout((caddr_t)ncd, argp, sizeof (struct nfsd_cargs))) 1146 nmp->nm_iflag |= NFSMNT_WAITAUTH; 1147 else 1148 return (ENEEDAUTH); 1149 } 1150 1151 /* 1152 * Wait a bit (no pun) and do it again. 1153 */ 1154 if ((nmp->nm_iflag & NFSMNT_DISMNT) == 0 && 1155 (nmp->nm_iflag & (NFSMNT_WAITAUTH | NFSMNT_HASAUTH))) { 1156 sleepreturn = tsleep((caddr_t)&nmp->nm_authstr, 1157 PSOCK | PCATCH, "nqnfstimr", hz / 3); 1158 } 1159 } 1160 1161 /* 1162 * Finally, we can free up the mount structure. 1163 */ 1164 for (nuidp = TAILQ_FIRST(&nmp->nm_uidlruhead); nuidp != 0; 1165 nuidp = nnuidp) { 1166 nnuidp = TAILQ_NEXT(nuidp, nu_lru); 1167 LIST_REMOVE(nuidp, nu_hash); 1168 TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru); 1169 free((caddr_t)nuidp, M_NFSUID); 1170 } 1171 free((caddr_t)nmp, M_NFSMNT); 1172 if (error == EWOULDBLOCK) 1173 error = 0; 1174 return (error); 1175 } 1176 #endif /* NFS */ 1177 1178 #if defined(NFS) && !defined(NFS_V2_ONLY) 1179 /* 1180 * Update a client lease. 1181 */ 1182 void 1183 nqnfs_clientlease(nmp, np, rwflag, cachable, expiry, frev) 1184 struct nfsmount *nmp; 1185 struct nfsnode *np; 1186 int rwflag, cachable; 1187 time_t expiry; 1188 u_quad_t frev; 1189 { 1190 struct nfsnode *tp; 1191 1192 if (CIRCLEQ_NEXT(np, n_timer) != 0) { 1193 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer); 1194 if (rwflag == ND_WRITE) 1195 np->n_flag |= NQNFSWRITE; 1196 } else if (rwflag == ND_READ) 1197 np->n_flag &= ~NQNFSWRITE; 1198 else 1199 np->n_flag |= NQNFSWRITE; 1200 if (cachable) 1201 np->n_flag &= ~NQNFSNONCACHE; 1202 else 1203 np->n_flag |= NQNFSNONCACHE; 1204 np->n_expiry = expiry; 1205 np->n_lrev = frev; 1206 tp = nmp->nm_timerhead.cqh_last; 1207 while (tp != (void *)&nmp->nm_timerhead && tp->n_expiry > np->n_expiry) 1208 tp = tp->n_timer.cqe_prev; 1209 if (tp == (void *)&nmp->nm_timerhead) { 1210 CIRCLEQ_INSERT_HEAD(&nmp->nm_timerhead, np, n_timer); 1211 } else { 1212 CIRCLEQ_INSERT_AFTER(&nmp->nm_timerhead, tp, np, n_timer); 1213 } 1214 } 1215 #endif /* NFS && !NFS_V2_ONLY */ 1216 1217 #if defined(NFSSERVER) || (defined(NFS) && !defined(NFS_V2_ONLY)) 1218 /* 1219 * Adjust all timer queue expiry times when the time of day clock is changed. 1220 * Called from the settimeofday() syscall. 1221 */ 1222 void 1223 nqnfs_lease_updatetime(deltat) 1224 int deltat; 1225 { 1226 struct nqlease *lp; 1227 struct nfsnode *np; 1228 struct mount *mp; 1229 struct nfsmount *nmp; 1230 int s; 1231 struct mount *nxtmp; 1232 1233 if (nqnfsstarttime != 0) 1234 nqnfsstarttime += deltat; 1235 s = splsoftnet(); 1236 CIRCLEQ_FOREACH(lp, &nqtimerhead, lc_timer) { 1237 lp->lc_expiry += deltat; 1238 } 1239 splx(s); 1240 1241 /* 1242 * Search the mount list for all nqnfs mounts and do their timer 1243 * queues. 1244 */ 1245 simple_lock(&mountlist_slock); 1246 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 1247 mp = nxtmp) { 1248 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 1249 nxtmp = CIRCLEQ_NEXT(mp, mnt_list); 1250 continue; 1251 } 1252 if (!strncmp(&mp->mnt_stat.f_fstypename[0], MOUNT_NFS, 1253 MFSNAMELEN)) { 1254 nmp = VFSTONFS(mp); 1255 if (nmp->nm_flag & NFSMNT_NQNFS) { 1256 CIRCLEQ_FOREACH(np, &nmp->nm_timerhead, 1257 n_timer) { 1258 np->n_expiry += deltat; 1259 } 1260 } 1261 } 1262 simple_lock(&mountlist_slock); 1263 nxtmp = CIRCLEQ_NEXT(mp, mnt_list); 1264 vfs_unbusy(mp); 1265 } 1266 simple_unlock(&mountlist_slock); 1267 } 1268 1269 /* 1270 * Lock a server lease. 1271 */ 1272 void 1273 nqsrv_locklease(lp) 1274 struct nqlease *lp; 1275 { 1276 1277 while (lp->lc_flag & LC_LOCKED) { 1278 lp->lc_flag |= LC_WANTED; 1279 (void) tsleep((caddr_t)lp, PSOCK, "nqlc", 0); 1280 } 1281 lp->lc_flag |= LC_LOCKED; 1282 lp->lc_flag &= ~LC_WANTED; 1283 } 1284 1285 /* 1286 * Unlock a server lease. 1287 */ 1288 void 1289 nqsrv_unlocklease(lp) 1290 struct nqlease *lp; 1291 { 1292 1293 lp->lc_flag &= ~LC_LOCKED; 1294 if (lp->lc_flag & LC_WANTED) 1295 wakeup((caddr_t)lp); 1296 } 1297 #endif /* NFSSERVER || NFS && !NFS_V2_ONLY */
Cache object: 7314f55e1c1b67816685979030c5cba6
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]