1 /* 2 * Copyright (c) 1992 The Regents of the University of California. 3 * 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 * %sccs.include.redist.c% 9 * 10 * @(#)nfs_nqlease.c 7.10 (Berkeley) 07/22/92 11 */ 12 13 /* 14 * References: 15 * Cary G. Gray and David R. Cheriton, "Leases: An Efficient Fault-Tolerant 16 * Mechanism for Distributed File Cache Consistency", 17 * In Proc. of the Twelfth ACM Symposium on Operating Systems 18 * Principals, pg. 202-210, Litchfield Park, AZ, Dec. 1989. 19 * Michael N. Nelson, Brent B. Welch and John K. Ousterhout, "Caching 20 * in the Sprite Network File System", ACM TOCS 6(1), 21 * pages 134-154, February 1988. 22 * V. Srinivasan and Jeffrey C. Mogul, "Spritely NFS: Implementation and 23 * Performance of Cache-Consistency Protocols", Digital 24 * Equipment Corporation WRL Research Report 89/5, May 1989. 25 */ 26 #include <sys/param.h> 27 #include <sys/vnode.h> 28 #include <sys/mount.h> 29 #include <sys/kernel.h> 30 #include <sys/proc.h> 31 #include <sys/systm.h> 32 #include <sys/mbuf.h> 33 #include <sys/socket.h> 34 #include <sys/socketvar.h> 35 #include <sys/file.h> 36 #include <sys/buf.h> 37 #include <sys/stat.h> 38 #include <sys/protosw.h> 39 #include <netinet/in.h> 40 #include <nfs/rpcv2.h> 41 #include <nfs/nfsv2.h> 42 #include <nfs/nfs.h> 43 #include <nfs/nfsm_subs.h> 44 #include <nfs/xdr_subs.h> 45 #include <nfs/nqnfs.h> 46 #include <nfs/nfsnode.h> 47 #include <nfs/nfsmount.h> 48 49 /* 50 * List head for the lease queue and other global data. 51 * At any time a lease is linked into a list ordered by increasing expiry time. 52 */ 53 #define NQFHHASH(f) ((*((u_long *)(f)))&nqfheadhash) 54 55 union nqsrvthead nqthead; 56 struct nqlease **nqfhead; 57 u_long nqfheadhash; 58 time_t nqnfsstarttime = (time_t)0; 59 u_long nqnfs_prog, nqnfs_vers; 60 int nqsrv_clockskew = NQ_CLOCKSKEW; 61 int nqsrv_writeslack = NQ_WRITESLACK; 62 int nqsrv_maxlease = NQ_MAXLEASE; 63 int nqsrv_maxnumlease = NQ_MAXNUMLEASE; 64 void nqsrv_instimeq(), nqsrv_send_eviction(), nfs_sndunlock(); 65 void nqsrv_unlocklease(), nqsrv_waitfor_expiry(), nfsrv_slpderef(); 66 void nqsrv_addhost(), nqsrv_locklease(), nqnfs_serverd(); 67 struct mbuf *nfsm_rpchead(); 68 69 /* 70 * Signifies which rpcs can have piggybacked lease requests 71 */ 72 int nqnfs_piggy[NFS_NPROCS] = { 73 0, 74 NQL_READ, 75 NQL_WRITE, 76 0, 77 NQL_READ, 78 NQL_READ, 79 NQL_READ, 80 0, 81 NQL_WRITE, 82 0, 83 0, 84 0, 85 0, 86 0, 87 0, 88 0, 89 NQL_READ, 90 0, 91 NQL_READ, 92 0, 93 0, 94 0, 95 }; 96 97 int nnnnnn = sizeof (struct nqlease); 98 int oooooo = sizeof (struct nfsnode); 99 extern nfstype nfs_type[9]; 100 extern struct nfssvc_sock *nfs_udpsock, *nfs_cltpsock; 101 extern struct nfsd nfsd_head; 102 extern int nfsd_waiting; 103 104 #define TRUE 1 105 #define FALSE 0 106 107 /* 108 * Get or check for a lease for "vp", based on NQL_CHECK flag. 109 * The rules are as follows: 110 * - if a current non-caching lease, reply non-caching 111 * - if a current lease for same host only, extend lease 112 * - if a read cachable lease and a read lease request 113 * add host to list any reply cachable 114 * - else { set non-cachable for read-write sharing } 115 * send eviction notice messages to all other hosts that have lease 116 * wait for lease termination { either by receiving vacated messages 117 * from all the other hosts or expiry 118 * via. timeout } 119 * modify lease to non-cachable 120 * - else if no current lease, issue new one 121 * - reply 122 * - return boolean TRUE iff nam should be m_freem()'d 123 * NB: Since nqnfs_serverd() is called from a timer, any potential tsleep() 124 * in here must be framed by nqsrv_locklease() and nqsrv_unlocklease(). 125 * nqsrv_locklease() is coded such that at least one of LC_LOCKED and 126 * LC_WANTED is set whenever a process is tsleeping in it. The exception 127 * is when a new lease is being allocated, since it is not in the timer 128 * queue yet. (Ditto for the splsoftclock() and splx(s) calls) 129 */ 130 nqsrv_getlease(vp, duration, flags, nd, nam, cachablep, frev, cred) 131 struct vnode *vp; 132 u_long *duration; 133 int flags; 134 struct nfsd *nd; 135 struct mbuf *nam; 136 int *cachablep; 137 u_quad_t *frev; 138 struct ucred *cred; 139 { 140 register struct nqlease *lp, *lq, **lpp; 141 register struct nqhost *lph; 142 struct nqlease *tlp; 143 struct nqm **lphp; 144 struct vattr vattr; 145 fhandle_t fh; 146 int i, ok, error, s; 147 148 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) 149 return (0); 150 if (*duration > nqsrv_maxlease) 151 *duration = nqsrv_maxlease; 152 if (error = VOP_GETATTR(vp, &vattr, cred, nd->nd_procp)) 153 return (error); 154 *frev = vattr.va_filerev; 155 s = splsoftclock(); 156 tlp = vp->v_lease; 157 if ((flags & NQL_CHECK) == 0) 158 nfsstats.srvnqnfs_getleases++; 159 if (tlp == (struct nqlease *)0) { 160 161 /* 162 * Find the lease by searching the hash list. 163 */ 164 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 165 if (error = VFS_VPTOFH(vp, &fh.fh_fid)) { 166 splx(s); 167 return (error); 168 } 169 lpp = &nqfhead[NQFHHASH(fh.fh_fid.fid_data)]; 170 for (lp = *lpp; lp; lp = lp->lc_fhnext) 171 if (fh.fh_fsid.val[0] == lp->lc_fsid.val[0] && 172 fh.fh_fsid.val[1] == lp->lc_fsid.val[1] && 173 !bcmp(fh.fh_fid.fid_data, lp->lc_fiddata, 174 fh.fh_fid.fid_len - sizeof (long))) { 175 /* Found it */ 176 lp->lc_vp = vp; 177 vp->v_lease = lp; 178 tlp = lp; 179 break; 180 } 181 } 182 lp = tlp; 183 if (lp) { 184 if ((lp->lc_flag & LC_NONCACHABLE) || 185 (lp->lc_morehosts == (struct nqm *)0 && 186 nqsrv_cmpnam(nd->nd_slp, nam, &lp->lc_host))) 187 goto doreply; 188 if ((flags & NQL_READ) && (lp->lc_flag & LC_WRITE)==0) { 189 if (flags & NQL_CHECK) 190 goto doreply; 191 if (nqsrv_cmpnam(nd->nd_slp, nam, &lp->lc_host)) 192 goto doreply; 193 i = 0; 194 if (lp->lc_morehosts) { 195 lph = lp->lc_morehosts->lpm_hosts; 196 lphp = &lp->lc_morehosts->lpm_next; 197 ok = 1; 198 } else { 199 lphp = &lp->lc_morehosts; 200 ok = 0; 201 } 202 while (ok && (lph->lph_flag & LC_VALID)) { 203 if (nqsrv_cmpnam(nd->nd_slp, nam, lph)) 204 goto doreply; 205 if (++i == LC_MOREHOSTSIZ) { 206 i = 0; 207 if (*lphp) { 208 lph = (*lphp)->lpm_hosts; 209 lphp = &((*lphp)->lpm_next); 210 } else 211 ok = 0; 212 } else 213 lph++; 214 } 215 nqsrv_locklease(lp); 216 if (!ok) { 217 *lphp = (struct nqm *) 218 malloc(sizeof (struct nqm), 219 M_NQMHOST, M_WAITOK); 220 bzero((caddr_t)*lphp, sizeof (struct nqm)); 221 lph = (*lphp)->lpm_hosts; 222 } 223 nqsrv_addhost(lph, nd->nd_slp, nam); 224 nqsrv_unlocklease(lp); 225 } else { 226 lp->lc_flag |= LC_NONCACHABLE; 227 nqsrv_locklease(lp); 228 VOP_UNLOCK(vp); 229 nqsrv_send_eviction(vp, lp, nd->nd_slp, nam, cred); 230 nqsrv_waitfor_expiry(lp); 231 VOP_LOCK(vp); 232 nqsrv_unlocklease(lp); 233 } 234 doreply: 235 /* 236 * Update the lease and return 237 */ 238 if ((flags & NQL_CHECK) == 0) 239 nqsrv_instimeq(lp, *duration); 240 if (lp->lc_flag & LC_NONCACHABLE) 241 *cachablep = 0; 242 else { 243 *cachablep = 1; 244 if (flags & NQL_WRITE) 245 lp->lc_flag |= LC_WRITTEN; 246 } 247 splx(s); 248 return (0); 249 } 250 splx(s); 251 if (flags & NQL_CHECK) 252 return (0); 253 254 /* 255 * Allocate new lease 256 * The value of nqsrv_maxnumlease should be set generously, so that 257 * the following "printf" happens infrequently. 258 */ 259 if (nfsstats.srvnqnfs_leases > nqsrv_maxnumlease) { 260 printf("Nqnfs server, too many leases\n"); 261 do { 262 (void) tsleep((caddr_t)&lbolt, PSOCK, 263 "nqsrvnuml", 0); 264 } while (nfsstats.srvnqnfs_leases > nqsrv_maxnumlease); 265 } 266 MALLOC(lp, struct nqlease *, sizeof (struct nqlease), M_NQLEASE, M_WAITOK); 267 bzero((caddr_t)lp, sizeof (struct nqlease)); 268 if (flags & NQL_WRITE) 269 lp->lc_flag |= (LC_WRITE | LC_WRITTEN); 270 nqsrv_addhost(&lp->lc_host, nd->nd_slp, nam); 271 lp->lc_vp = vp; 272 lp->lc_fsid = fh.fh_fsid; 273 bcopy(fh.fh_fid.fid_data, lp->lc_fiddata, fh.fh_fid.fid_len - sizeof (long)); 274 if (lq = *lpp) 275 lq->lc_fhprev = &lp->lc_fhnext; 276 lp->lc_fhnext = lq; 277 lp->lc_fhprev = lpp; 278 *lpp = lp; 279 vp->v_lease = lp; 280 s = splsoftclock(); 281 nqsrv_instimeq(lp, *duration); 282 splx(s); 283 *cachablep = 1; 284 if (++nfsstats.srvnqnfs_leases > nfsstats.srvnqnfs_maxleases) 285 nfsstats.srvnqnfs_maxleases = nfsstats.srvnqnfs_leases; 286 return (0); 287 } 288 289 /* 290 * Local lease check for server syscalls. 291 * Just set up args and let nqsrv_getlease() do the rest. 292 */ 293 void 294 lease_check(vp, p, cred, flag) 295 struct vnode *vp; 296 struct proc *p; 297 struct ucred *cred; 298 int flag; 299 { 300 int duration, cache; 301 struct nfsd nfsd; 302 u_quad_t frev; 303 304 nfsd.nd_slp = NQLOCALSLP; 305 nfsd.nd_procp = p; 306 (void) nqsrv_getlease(vp, &duration, NQL_CHECK | flag, &nfsd, 307 (struct mbuf *)0, &cache, &frev, cred); 308 } 309 310 /* 311 * Add a host to an nqhost structure for a lease. 312 */ 313 void 314 nqsrv_addhost(lph, slp, nam) 315 register struct nqhost *lph; 316 struct nfssvc_sock *slp; 317 struct mbuf *nam; 318 { 319 register struct sockaddr_in *saddr; 320 321 if (slp == NQLOCALSLP) 322 lph->lph_flag |= (LC_VALID | LC_LOCAL); 323 else if (slp == nfs_udpsock) { 324 saddr = mtod(nam, struct sockaddr_in *); 325 lph->lph_flag |= (LC_VALID | LC_UDP); 326 lph->lph_inetaddr = saddr->sin_addr.s_addr; 327 lph->lph_port = saddr->sin_port; 328 } else if (slp == nfs_cltpsock) { 329 lph->lph_nam = m_copym(nam, 0, M_COPYALL, M_WAIT); 330 lph->lph_flag |= (LC_VALID | LC_CLTP); 331 } else { 332 lph->lph_flag |= (LC_VALID | LC_SREF); 333 lph->lph_slp = slp; 334 slp->ns_sref++; 335 } 336 } 337 338 /* 339 * Update the lease expiry time and position it in the timer queue correctly. 340 */ 341 void 342 nqsrv_instimeq(lp, duration) 343 register struct nqlease *lp; 344 u_long duration; 345 { 346 register struct nqlease *tlp; 347 time_t newexpiry; 348 349 newexpiry = time.tv_sec + duration + nqsrv_clockskew; 350 if (lp->lc_expiry == newexpiry) 351 return; 352 if (lp->lc_chain1[0]) 353 remque(lp); 354 lp->lc_expiry = newexpiry; 355 356 /* 357 * Find where in the queue it should be. 358 */ 359 tlp = nqthead.th_chain[1]; 360 while (tlp->lc_expiry > newexpiry && tlp != (struct nqlease *)&nqthead) 361 tlp = tlp->lc_chain1[1]; 362 if (tlp == nqthead.th_chain[1]) 363 NQSTORENOVRAM(newexpiry); 364 insque(lp, tlp); 365 } 366 367 /* 368 * Compare the requesting host address with the lph entry in the lease. 369 * Return true iff it is the same. 370 * This is somewhat messy due to the union in the nqhost structure. 371 * The local host is indicated by the special value of NQLOCALSLP for slp. 372 */ 373 nqsrv_cmpnam(slp, nam, lph) 374 register struct nfssvc_sock *slp; 375 struct mbuf *nam; 376 register struct nqhost *lph; 377 { 378 register struct sockaddr_in *saddr; 379 struct mbuf *addr; 380 union nethostaddr lhaddr; 381 int ret; 382 383 if (slp == NQLOCALSLP) { 384 if (lph->lph_flag & LC_LOCAL) 385 return (1); 386 else 387 return (0); 388 } 389 if (slp == nfs_udpsock || slp == nfs_cltpsock) 390 addr = nam; 391 else 392 addr = slp->ns_nam; 393 if (lph->lph_flag & LC_UDP) 394 ret = netaddr_match(AF_INET, &lph->lph_haddr, 395 (union nethostaddr *)0, addr); 396 else if (lph->lph_flag & LC_CLTP) 397 ret = netaddr_match(AF_ISO, &lph->lph_claddr, 398 (union nethostaddr *)0, addr); 399 else { 400 if ((lph->lph_slp->ns_flag & SLP_VALID) == 0) 401 return (0); 402 saddr = mtod(lph->lph_slp->ns_nam, struct sockaddr_in *); 403 if (saddr->sin_family == AF_INET) 404 lhaddr.had_inetaddr = saddr->sin_addr.s_addr; 405 else 406 lhaddr.had_nam = lph->lph_slp->ns_nam; 407 ret = netaddr_match(saddr->sin_family, &lhaddr, 408 (union nethostaddr *)0, addr); 409 } 410 return (ret); 411 } 412 413 /* 414 * Send out eviction notice messages to all other hosts for the lease. 415 */ 416 void 417 nqsrv_send_eviction(vp, lp, slp, nam, cred) 418 struct vnode *vp; 419 register struct nqlease *lp; 420 struct nfssvc_sock *slp; 421 struct mbuf *nam; 422 struct ucred *cred; 423 { 424 register struct nqhost *lph = &lp->lc_host; 425 register struct mbuf *m; 426 register int siz; 427 struct nqm *lphnext = lp->lc_morehosts; 428 struct mbuf *mreq, *mb, *mb2, *nam2, *mheadend; 429 struct socket *so; 430 struct sockaddr_in *saddr; 431 fhandle_t *fhp; 432 caddr_t bpos, cp; 433 u_long xid; 434 int len = 1, ok = 1, i = 0; 435 int sotype, *solockp; 436 437 while (ok && (lph->lph_flag & LC_VALID)) { 438 if (nqsrv_cmpnam(slp, nam, lph)) 439 lph->lph_flag |= LC_VACATED; 440 else if ((lph->lph_flag & (LC_LOCAL | LC_VACATED)) == 0) { 441 if (lph->lph_flag & LC_UDP) { 442 MGET(nam2, M_WAIT, MT_SONAME); 443 saddr = mtod(nam2, struct sockaddr_in *); 444 nam2->m_len = saddr->sin_len = 445 sizeof (struct sockaddr_in); 446 saddr->sin_family = AF_INET; 447 saddr->sin_addr.s_addr = lph->lph_inetaddr; 448 saddr->sin_port = lph->lph_port; 449 so = nfs_udpsock->ns_so; 450 } else if (lph->lph_flag & LC_CLTP) { 451 nam2 = lph->lph_nam; 452 so = nfs_cltpsock->ns_so; 453 } else if (lph->lph_slp->ns_flag & SLP_VALID) { 454 nam2 = (struct mbuf *)0; 455 so = lph->lph_slp->ns_so; 456 } else 457 goto nextone; 458 sotype = so->so_type; 459 if (so->so_proto->pr_flags & PR_CONNREQUIRED) 460 solockp = &lph->lph_slp->ns_solock; 461 else 462 solockp = (int *)0; 463 nfsm_reqhead((struct vnode *)0, NQNFSPROC_EVICTED, 464 NFSX_FH); 465 nfsm_build(cp, caddr_t, NFSX_FH); 466 bzero(cp, NFSX_FH); 467 fhp = (fhandle_t *)cp; 468 fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid; 469 VFS_VPTOFH(vp, &fhp->fh_fid); 470 m = mreq; 471 siz = 0; 472 while (m) { 473 siz += m->m_len; 474 m = m->m_next; 475 } 476 if (siz <= 0 || siz > NFS_MAXPACKET) { 477 printf("mbuf siz=%d\n",siz); 478 panic("Bad nfs svc reply"); 479 } 480 m = nfsm_rpchead(cred, TRUE, NQNFSPROC_EVICTED, 481 RPCAUTH_UNIX, 5*NFSX_UNSIGNED, (char *)0, 482 mreq, siz, &mheadend, &xid); 483 /* 484 * For stream protocols, prepend a Sun RPC 485 * Record Mark. 486 */ 487 if (sotype == SOCK_STREAM) { 488 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 489 *mtod(m, u_long *) = htonl(0x80000000 | 490 (m->m_pkthdr.len - NFSX_UNSIGNED)); 491 } 492 if (((lph->lph_flag & (LC_UDP | LC_CLTP)) == 0 && 493 (lph->lph_slp->ns_flag & SLP_VALID) == 0) || 494 (solockp && (*solockp & NFSMNT_SNDLOCK))) 495 m_freem(m); 496 else { 497 if (solockp) 498 *solockp |= NFSMNT_SNDLOCK; 499 (void) nfs_send(so, nam2, m, 500 (struct nfsreq *)0); 501 if (solockp) 502 nfs_sndunlock(solockp); 503 } 504 if (lph->lph_flag & LC_UDP) 505 MFREE(nam2, m); 506 } 507 nextone: 508 if (++i == len) { 509 if (lphnext) { 510 i = 0; 511 len = LC_MOREHOSTSIZ; 512 lph = lphnext->lpm_hosts; 513 lphnext = lphnext->lpm_next; 514 } else 515 ok = 0; 516 } else 517 lph++; 518 } 519 } 520 521 /* 522 * Wait for the lease to expire. 523 * This will occur when all clients have sent "vacated" messages to 524 * this server OR when it expires do to timeout. 525 */ 526 void 527 nqsrv_waitfor_expiry(lp) 528 register struct nqlease *lp; 529 { 530 register struct nqhost *lph; 531 register int i; 532 struct nqm *lphnext; 533 int len, ok; 534 535 tryagain: 536 if (time.tv_sec > lp->lc_expiry) 537 return; 538 lph = &lp->lc_host; 539 lphnext = lp->lc_morehosts; 540 len = 1; 541 i = 0; 542 ok = 1; 543 while (ok && (lph->lph_flag & LC_VALID)) { 544 if ((lph->lph_flag & (LC_LOCAL | LC_VACATED)) == 0) { 545 lp->lc_flag |= LC_EXPIREDWANTED; 546 (void) tsleep((caddr_t)&lp->lc_flag, PSOCK, 547 "nqexp", 0); 548 goto tryagain; 549 } 550 if (++i == len) { 551 if (lphnext) { 552 i = 0; 553 len = LC_MOREHOSTSIZ; 554 lph = lphnext->lpm_hosts; 555 lphnext = lphnext->lpm_next; 556 } else 557 ok = 0; 558 } else 559 lph++; 560 } 561 } 562 563 /* 564 * Nqnfs server timer that maintains the server lease queue. 565 * Scan the lease queue for expired entries: 566 * - when one is found, wakeup anyone waiting for it 567 * else dequeue and free 568 */ 569 void 570 nqnfs_serverd() 571 { 572 register struct nqlease *lp, *lq; 573 register struct nqhost *lph; 574 struct nqlease *nextlp; 575 struct nqm *lphnext, *olphnext; 576 struct mbuf *n; 577 union nqsrvthead *lhp; 578 int i, len, ok; 579 580 lp = nqthead.th_chain[0]; 581 while (lp != (struct nqlease *)&nqthead) { 582 if (lp->lc_expiry >= time.tv_sec) 583 break; 584 nextlp = lp->lc_chain1[0]; 585 if (lp->lc_flag & LC_EXPIREDWANTED) { 586 lp->lc_flag &= ~LC_EXPIREDWANTED; 587 wakeup((caddr_t)&lp->lc_flag); 588 } else if ((lp->lc_flag & (LC_LOCKED | LC_WANTED)) == 0) { 589 /* 590 * Make a best effort at keeping a write caching lease long 591 * enough by not deleting it until it has been explicitly 592 * vacated or there have been no writes in the previous 593 * write_slack seconds since expiry and the nfsds are not 594 * all busy. The assumption is that if the nfsds are not 595 * all busy now (no queue of nfs requests), then the client 596 * would have been able to do at least one write to the 597 * file during the last write_slack seconds if it was still 598 * trying to push writes to the server. 599 */ 600 if ((lp->lc_flag & (LC_WRITE | LC_VACATED)) == LC_WRITE && 601 ((lp->lc_flag & LC_WRITTEN) || nfsd_waiting == 0)) { 602 lp->lc_flag &= ~LC_WRITTEN; 603 nqsrv_instimeq(lp, nqsrv_writeslack); 604 } else { 605 remque(lp); 606 if (lq = lp->lc_fhnext) 607 lq->lc_fhprev = lp->lc_fhprev; 608 *lp->lc_fhprev = lq; 609 /* 610 * This soft reference may no longer be valid, but 611 * no harm done. The worst case is if the vnode was 612 * recycled and has another valid lease reference, 613 * which is dereferenced prematurely. 614 */ 615 lp->lc_vp->v_lease = (struct nqlease *)0; 616 lph = &lp->lc_host; 617 lphnext = lp->lc_morehosts; 618 olphnext = (struct nqm *)0; 619 len = 1; 620 i = 0; 621 ok = 1; 622 while (ok && (lph->lph_flag & LC_VALID)) { 623 if (lph->lph_flag & LC_CLTP) 624 MFREE(lph->lph_nam, n); 625 if (lph->lph_flag & LC_SREF) 626 nfsrv_slpderef(lph->lph_slp); 627 if (++i == len) { 628 if (olphnext) { 629 free((caddr_t)olphnext, M_NQMHOST); 630 olphnext = (struct nqm *)0; 631 } 632 if (lphnext) { 633 olphnext = lphnext; 634 i = 0; 635 len = LC_MOREHOSTSIZ; 636 lph = lphnext->lpm_hosts; 637 lphnext = lphnext->lpm_next; 638 } else 639 ok = 0; 640 } else 641 lph++; 642 } 643 FREE((caddr_t)lp, M_NQLEASE); 644 if (olphnext) 645 free((caddr_t)olphnext, M_NQMHOST); 646 nfsstats.srvnqnfs_leases--; 647 } 648 } 649 lp = nextlp; 650 } 651 } 652 653 /* 654 * Called from nfssvc_nfsd() for a getlease rpc request. 655 * Do the from/to xdr translation and call nqsrv_getlease() to 656 * do the real work. 657 */ 658 nqnfsrv_getlease(nfsd, mrep, md, dpos, cred, nam, mrq) 659 struct nfsd *nfsd; 660 struct mbuf *mrep, *md; 661 caddr_t dpos; 662 struct ucred *cred; 663 struct mbuf *nam, **mrq; 664 { 665 register struct nfsv2_fattr *fp; 666 struct vattr va; 667 register struct vattr *vap = &va; 668 struct vnode *vp; 669 nfsv2fh_t nfh; 670 fhandle_t *fhp; 671 register u_long *tl; 672 register long t1; 673 u_quad_t frev; 674 caddr_t bpos; 675 int error = 0; 676 char *cp2; 677 struct mbuf *mb, *mb2, *mreq; 678 int flags, rdonly, cache; 679 680 fhp = &nfh.fh_generic; 681 nfsm_srvmtofh(fhp); 682 nfsm_dissect(tl, u_long *, 2*NFSX_UNSIGNED); 683 flags = fxdr_unsigned(int, *tl++); 684 nfsd->nd_duration = fxdr_unsigned(int, *tl); 685 if (error = nfsrv_fhtovp(fhp, TRUE, &vp, cred, nfsd->nd_slp, nam, &rdonly)) 686 nfsm_reply(0); 687 if (rdonly && flags == NQL_WRITE) { 688 error = EROFS; 689 nfsm_reply(0); 690 } 691 (void) nqsrv_getlease(vp, &nfsd->nd_duration, flags, nfsd, 692 nam, &cache, &frev, cred); 693 error = VOP_GETATTR(vp, vap, cred, nfsd->nd_procp); 694 vput(vp); 695 nfsm_reply(NFSX_FATTR + 4*NFSX_UNSIGNED); 696 nfsm_build(tl, u_long *, 4*NFSX_UNSIGNED); 697 *tl++ = txdr_unsigned(cache); 698 *tl++ = txdr_unsigned(nfsd->nd_duration); 699 txdr_hyper(&frev, tl); 700 nfsm_build(fp, struct nfsv2_fattr *, NFSX_FATTR); 701 nfsm_srvfillattr; 702 nfsm_srvdone; 703 } 704 705 /* 706 * Called from nfssvc_nfsd() when a "vacated" message is received from a 707 * client. Find the entry and expire it. 708 */ 709 nqnfsrv_vacated(nfsd, mrep, md, dpos, cred, nam, mrq) 710 struct nfsd *nfsd; 711 struct mbuf *mrep, *md; 712 caddr_t dpos; 713 struct ucred *cred; 714 struct mbuf *nam, **mrq; 715 { 716 register struct nqlease *lp; 717 register struct nqhost *lph; 718 struct nqlease *tlp = (struct nqlease *)0; 719 struct vnode *vp; 720 nfsv2fh_t nfh; 721 fhandle_t *fhp; 722 register u_long *tl; 723 register long t1; 724 struct nqm *lphnext; 725 union nqsrvthead *lhp; 726 u_quad_t frev; 727 int error = 0, i, len, ok, rdonly, gotit = 0; 728 char *cp2; 729 730 fhp = &nfh.fh_generic; 731 nfsm_srvmtofh(fhp); 732 if (error = nfsrv_fhtovp(fhp, FALSE, &vp, cred, nfsd->nd_slp, nam, &rdonly)) 733 return (error); 734 m_freem(mrep); 735 tlp = vp->v_lease; 736 if (tlp == (struct nqlease *)0) { 737 /* 738 * Find the lease by searching the hash list. 739 */ 740 for (lp = nqfhead[NQFHHASH(fhp->fh_fid.fid_data)]; lp; 741 lp = lp->lc_fhnext) 742 if (fhp->fh_fsid.val[0] == lp->lc_fsid.val[0] && 743 fhp->fh_fsid.val[1] == lp->lc_fsid.val[1] && 744 !bcmp(fhp->fh_fid.fid_data, lp->lc_fiddata, 745 MAXFIDSZ)) { 746 /* Found it */ 747 lp->lc_vp = vp; 748 vp->v_lease = lp; 749 tlp = lp; 750 break; 751 } 752 } 753 vrele(vp); 754 if (tlp) { 755 lp = tlp; 756 len = 1; 757 i = 0; 758 lph = &lp->lc_host; 759 lphnext = lp->lc_morehosts; 760 ok = 1; 761 while (ok && (lph->lph_flag & LC_VALID)) { 762 if (nqsrv_cmpnam(nfsd->nd_slp, nam, lph)) { 763 lph->lph_flag |= LC_VACATED; 764 gotit++; 765 break; 766 } 767 if (++i == len) { 768 if (lphnext) { 769 len = LC_MOREHOSTSIZ; 770 i = 0; 771 lph = lphnext->lpm_hosts; 772 lphnext = lphnext->lpm_next; 773 } else 774 ok = 0; 775 } else 776 lph++; 777 } 778 if ((lp->lc_flag & LC_EXPIREDWANTED) && gotit) { 779 lp->lc_flag &= ~LC_EXPIREDWANTED; 780 wakeup((caddr_t)&lp->lc_flag); 781 } 782 nfsmout: 783 return (EPERM); 784 } 785 return (EPERM); 786 } 787 788 /* 789 * Client get lease rpc function. 790 */ 791 nqnfs_getlease(vp, rwflag, cred, p) 792 register struct vnode *vp; 793 int rwflag; 794 struct ucred *cred; 795 struct proc *p; 796 { 797 register u_long *tl; 798 register caddr_t cp; 799 register long t1; 800 register struct nfsnode *np, *tp; 801 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 802 caddr_t bpos, dpos, cp2; 803 time_t reqtime; 804 int error = 0; 805 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 806 int cachable; 807 808 nfsstats.rpccnt[NQNFSPROC_GETLEASE]++; 809 mb = mreq = nfsm_reqh(vp, NQNFSPROC_GETLEASE, NFSX_FH+2*NFSX_UNSIGNED, 810 &bpos); 811 nfsm_fhtom(vp); 812 nfsm_build(tl, u_long *, 2*NFSX_UNSIGNED); 813 *tl++ = txdr_unsigned(rwflag); 814 *tl = txdr_unsigned(nmp->nm_leaseterm); 815 reqtime = time.tv_sec; 816 nfsm_request(vp, NQNFSPROC_GETLEASE, p, cred); 817 np = VTONFS(vp); 818 nfsm_dissect(tl, u_long *, 4*NFSX_UNSIGNED); 819 cachable = fxdr_unsigned(int, *tl++); 820 reqtime += fxdr_unsigned(int, *tl++); 821 if (reqtime > time.tv_sec) { 822 if (np->n_tnext) { 823 if (np->n_tnext == (struct nfsnode *)nmp) 824 nmp->nm_tprev = np->n_tprev; 825 else 826 np->n_tnext->n_tprev = np->n_tprev; 827 if (np->n_tprev == (struct nfsnode *)nmp) 828 nmp->nm_tnext = np->n_tnext; 829 else 830 np->n_tprev->n_tnext = np->n_tnext; 831 if (rwflag == NQL_WRITE) 832 np->n_flag |= NQNFSWRITE; 833 } else if (rwflag == NQL_READ) 834 np->n_flag &= ~NQNFSWRITE; 835 else 836 np->n_flag |= NQNFSWRITE; 837 if (cachable) 838 np->n_flag &= ~NQNFSNONCACHE; 839 else 840 np->n_flag |= NQNFSNONCACHE; 841 np->n_expiry = reqtime; 842 fxdr_hyper(tl, &np->n_lrev); 843 tp = nmp->nm_tprev; 844 while (tp != (struct nfsnode *)nmp && tp->n_expiry > np->n_expiry) 845 tp = tp->n_tprev; 846 if (tp == (struct nfsnode *)nmp) { 847 np->n_tnext = nmp->nm_tnext; 848 nmp->nm_tnext = np; 849 } else { 850 np->n_tnext = tp->n_tnext; 851 tp->n_tnext = np; 852 } 853 np->n_tprev = tp; 854 if (np->n_tnext == (struct nfsnode *)nmp) 855 nmp->nm_tprev = np; 856 else 857 np->n_tnext->n_tprev = np; 858 nfsm_loadattr(vp, (struct vattr *)0); 859 } else 860 error = NQNFS_EXPIRED; 861 nfsm_reqdone; 862 return (error); 863 } 864 865 /* 866 * Client vacated message function. 867 */ 868 nqnfs_vacated(vp, cred) 869 register struct vnode *vp; 870 struct ucred *cred; 871 { 872 register caddr_t cp; 873 register struct mbuf *m; 874 register int i; 875 caddr_t bpos; 876 u_long xid; 877 int error = 0; 878 struct mbuf *mreq, *mb, *mb2, *mheadend; 879 struct nfsmount *nmp; 880 struct nfsreq myrep; 881 882 nmp = VFSTONFS(vp->v_mount); 883 nfsstats.rpccnt[NQNFSPROC_VACATED]++; 884 nfsm_reqhead(vp, NQNFSPROC_VACATED, NFSX_FH); 885 nfsm_fhtom(vp); 886 m = mreq; 887 i = 0; 888 while (m) { 889 i += m->m_len; 890 m = m->m_next; 891 } 892 m = nfsm_rpchead(cred, TRUE, NQNFSPROC_VACATED, 893 RPCAUTH_UNIX, 5*NFSX_UNSIGNED, (char *)0, 894 mreq, i, &mheadend, &xid); 895 if (nmp->nm_sotype == SOCK_STREAM) { 896 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 897 *mtod(m, u_long *) = htonl(0x80000000 | (m->m_pkthdr.len - 898 NFSX_UNSIGNED)); 899 } 900 myrep.r_flags = 0; 901 myrep.r_nmp = nmp; 902 if (nmp->nm_soflags & PR_CONNREQUIRED) 903 (void) nfs_sndlock(&nmp->nm_flag, (struct nfsreq *)0); 904 (void) nfs_send(nmp->nm_so, nmp->nm_nam, m, &myrep); 905 if (nmp->nm_soflags & PR_CONNREQUIRED) 906 nfs_sndunlock(&nmp->nm_flag); 907 return (error); 908 } 909 910 /* 911 * Called for client side callbacks 912 */ 913 nqnfs_callback(nmp, mrep, md, dpos) 914 struct nfsmount *nmp; 915 struct mbuf *mrep, *md; 916 caddr_t dpos; 917 { 918 register struct vnode *vp; 919 register u_long *tl; 920 register long t1; 921 nfsv2fh_t nfh; 922 fhandle_t *fhp; 923 struct nfsnode *np; 924 struct nfsd nd; 925 int error; 926 char *cp2; 927 928 nd.nd_mrep = mrep; 929 nd.nd_md = md; 930 nd.nd_dpos = dpos; 931 if (error = nfs_getreq(&nd, FALSE)) 932 return (error); 933 md = nd.nd_md; 934 dpos = nd.nd_dpos; 935 if (nd.nd_procnum != NQNFSPROC_EVICTED) { 936 m_freem(mrep); 937 return (EPERM); 938 } 939 fhp = &nfh.fh_generic; 940 nfsm_srvmtofh(fhp); 941 m_freem(mrep); 942 if (error = nfs_nget(nmp->nm_mountp, fhp, &np)) 943 return (error); 944 vp = NFSTOV(np); 945 if (np->n_tnext) { 946 np->n_expiry = 0; 947 np->n_flag |= NQNFSEVICTED; 948 if (np->n_tprev != (struct nfsnode *)nmp) { 949 if (np->n_tnext == (struct nfsnode *)nmp) 950 nmp->nm_tprev = np->n_tprev; 951 else 952 np->n_tnext->n_tprev = np->n_tprev; 953 np->n_tprev->n_tnext = np->n_tnext; 954 np->n_tnext = nmp->nm_tnext; 955 nmp->nm_tnext = np; 956 np->n_tprev = (struct nfsnode *)nmp; 957 if (np->n_tnext == (struct nfsnode *)nmp) 958 nmp->nm_tprev = np; 959 else 960 np->n_tnext->n_tprev = np; 961 } 962 } 963 vrele(vp); 964 nfsm_srvdone; 965 } 966 967 /* 968 * Nqnfs client helper daemon. Runs once a second to expire leases. 969 * It also get authorization strings for "kerb" mounts. 970 * It must start at the beginning of the list again after any potential 971 * "sleep" since nfs_reclaim() called from vclean() can pull a node off 972 * the list asynchronously. 973 */ 974 nqnfs_clientd(nmp, cred, ncd, flag, argp, p) 975 register struct nfsmount *nmp; 976 struct ucred *cred; 977 struct nfsd_cargs *ncd; 978 int flag; 979 caddr_t argp; 980 struct proc *p; 981 { 982 register struct nfsnode *np; 983 struct vnode *vp; 984 int error, vpid; 985 986 /* 987 * First initialize some variables 988 */ 989 nqnfs_prog = txdr_unsigned(NQNFS_PROG); 990 nqnfs_vers = txdr_unsigned(NQNFS_VER1); 991 992 /* 993 * If an authorization string is being passed in, get it. 994 */ 995 if ((flag & NFSSVC_GOTAUTH) && 996 (nmp->nm_flag & (NFSMNT_WAITAUTH | NFSMNT_DISMNT)) == 0) { 997 if (nmp->nm_flag & NFSMNT_HASAUTH) 998 panic("cld kerb"); 999 if ((flag & NFSSVC_AUTHINFAIL) == 0) { 1000 if (ncd->ncd_authlen <= RPCAUTH_MAXSIZ && 1001 copyin(ncd->ncd_authstr, nmp->nm_authstr, 1002 ncd->ncd_authlen) == 0) { 1003 nmp->nm_authtype = ncd->ncd_authtype; 1004 nmp->nm_authlen = ncd->ncd_authlen; 1005 } else 1006 nmp->nm_flag |= NFSMNT_AUTHERR; 1007 } else 1008 nmp->nm_flag |= NFSMNT_AUTHERR; 1009 nmp->nm_flag |= NFSMNT_HASAUTH; 1010 wakeup((caddr_t)&nmp->nm_authlen); 1011 } else 1012 nmp->nm_flag |= NFSMNT_WAITAUTH; 1013 1014 /* 1015 * Loop every second updating queue until there is a termination sig. 1016 */ 1017 while ((nmp->nm_flag & NFSMNT_DISMNT) == 0) { 1018 if (nmp->nm_flag & NFSMNT_NQNFS) { 1019 np = nmp->nm_tnext; 1020 while (np != (struct nfsnode *)nmp && 1021 (nmp->nm_flag & NFSMNT_DISMINPROG) == 0) { 1022 vp = NFSTOV(np); 1023 if (vp->v_mount->mnt_stat.f_fsid.val[1] != MOUNT_NFS) panic("trash2"); 1024 vpid = vp->v_id; 1025 if (np->n_expiry < time.tv_sec) { 1026 if (vget(vp) == 0) { 1027 nmp->nm_inprog = vp; 1028 if (vpid == vp->v_id) { 1029 if (vp->v_mount->mnt_stat.f_fsid.val[1] != MOUNT_NFS) panic("trash3"); 1030 if (np->n_tnext == (struct nfsnode *)nmp) 1031 nmp->nm_tprev = np->n_tprev; 1032 else 1033 np->n_tnext->n_tprev = np->n_tprev; 1034 if (np->n_tprev == (struct nfsnode *)nmp) 1035 nmp->nm_tnext = np->n_tnext; 1036 else 1037 np->n_tprev->n_tnext = np->n_tnext; 1038 np->n_tnext = (struct nfsnode *)0; 1039 if ((np->n_flag & (NMODIFIED | NQNFSEVICTED)) 1040 && vp->v_type == VREG) { 1041 np->n_flag &= ~NMODIFIED; 1042 if (np->n_flag & NQNFSEVICTED) { 1043 (void) vinvalbuf(vp, TRUE, 1044 cred, p); 1045 np->n_flag &= ~NQNFSEVICTED; 1046 (void) nqnfs_vacated(vp, cred); 1047 } else 1048 (void) VOP_FSYNC(vp, cred, 1049 MNT_WAIT, p); 1050 } 1051 } 1052 vrele(vp); 1053 nmp->nm_inprog = NULLVP; 1054 } 1055 if (np != nmp->nm_tnext) 1056 np = nmp->nm_tnext; 1057 else 1058 break; 1059 } else if ((np->n_expiry - NQ_RENEWAL) < time.tv_sec) { 1060 if ((np->n_flag & (NQNFSWRITE | NQNFSNONCACHE)) 1061 == NQNFSWRITE && vp->v_dirtyblkhd && 1062 vget(vp) == 0) { 1063 nmp->nm_inprog = vp; 1064 if (vp->v_mount->mnt_stat.f_fsid.val[1] != MOUNT_NFS) panic("trash4"); 1065 if (vpid == vp->v_id && 1066 nqnfs_getlease(vp, NQL_WRITE, cred, p)==0) 1067 np->n_brev = np->n_lrev; 1068 vrele(vp); 1069 nmp->nm_inprog = NULLVP; 1070 } 1071 if (np != nmp->nm_tnext) 1072 np = nmp->nm_tnext; 1073 else 1074 break; 1075 } else 1076 break; 1077 } 1078 } 1079 1080 /* 1081 * Get an authorization string, if required. 1082 */ 1083 if ((nmp->nm_flag & (NFSMNT_WAITAUTH | NFSMNT_DISMNT | NFSMNT_HASAUTH)) == 0) { 1084 ncd->ncd_authuid = nmp->nm_authuid; 1085 if (copyout((caddr_t)ncd, argp, sizeof (*ncd))) 1086 nmp->nm_flag |= NFSMNT_WAITAUTH; 1087 else 1088 return (ENEEDAUTH); 1089 } 1090 1091 /* 1092 * Wait a bit (no pun) and do it again. 1093 */ 1094 if ((nmp->nm_flag & NFSMNT_DISMNT) == 0 && 1095 (nmp->nm_flag & (NFSMNT_WAITAUTH | NFSMNT_HASAUTH))) { 1096 error = tsleep((caddr_t)&nmp->nm_authstr, PSOCK | PCATCH, 1097 "nqnfstimr", hz / 3); 1098 if (error == EINTR || error == ERESTART) 1099 (void) dounmount(nmp->nm_mountp, MNT_NOFORCE); 1100 } 1101 } 1102 free((caddr_t)nmp, M_NFSMNT); 1103 if (error == EWOULDBLOCK) 1104 error = 0; 1105 return (error); 1106 } 1107 1108 /* 1109 * Adjust all timer queue expiry times when the time of day clock is changed. 1110 * Called from the settimeofday() syscall. 1111 */ 1112 void 1113 lease_updatetime(deltat) 1114 register int deltat; 1115 { 1116 register struct nqlease *lp; 1117 register struct nfsnode *np; 1118 struct mount *mp; 1119 struct nfsmount *nmp; 1120 int s; 1121 1122 if (nqnfsstarttime != 0) 1123 nqnfsstarttime += deltat; 1124 s = splsoftclock(); 1125 lp = nqthead.th_chain[0]; 1126 while (lp != (struct nqlease *)&nqthead) { 1127 lp->lc_expiry += deltat; 1128 lp = lp->lc_chain1[0]; 1129 } 1130 splx(s); 1131 1132 /* 1133 * Search the mount list for all nqnfs mounts and do their timer 1134 * queues. 1135 */ 1136 mp = rootfs; 1137 do { 1138 if (mp->mnt_stat.f_fsid.val[1] == MOUNT_NFS) { 1139 nmp = VFSTONFS(mp); 1140 if (nmp->nm_flag & NFSMNT_NQNFS) { 1141 np = nmp->nm_tnext; 1142 while (np != (struct nfsnode *)nmp) { 1143 np->n_expiry += deltat; 1144 np = np->n_tnext; 1145 } 1146 } 1147 } 1148 mp = mp->mnt_next; 1149 } while (mp != rootfs); 1150 } 1151 1152 /* 1153 * Lock a server lease. 1154 */ 1155 void 1156 nqsrv_locklease(lp) 1157 struct nqlease *lp; 1158 { 1159 1160 while (lp->lc_flag & LC_LOCKED) { 1161 lp->lc_flag |= LC_WANTED; 1162 (void) tsleep((caddr_t)lp, PSOCK, "nqlc", 0); 1163 } 1164 lp->lc_flag |= LC_LOCKED; 1165 lp->lc_flag &= ~LC_WANTED; 1166 } 1167 1168 /* 1169 * Unlock a server lease. 1170 */ 1171 void 1172 nqsrv_unlocklease(lp) 1173 struct nqlease *lp; 1174 { 1175 1176 lp->lc_flag &= ~LC_LOCKED; 1177 if (lp->lc_flag & LC_WANTED) 1178 wakeup((caddr_t)lp); 1179 } 1180