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 7.20 (Berkeley) 04/27/93 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 40 #include <netinet/in.h> 41 #include <nfs/rpcv2.h> 42 #include <nfs/nfsv2.h> 43 #include <nfs/nfs.h> 44 #include <nfs/nfsm_subs.h> 45 #include <nfs/xdr_subs.h> 46 #include <nfs/nqnfs.h> 47 #include <nfs/nfsnode.h> 48 #include <nfs/nfsmount.h> 49 50 /* 51 * List head for the lease queue and other global data. 52 * At any time a lease is linked into a list ordered by increasing expiry time. 53 */ 54 #define NQFHHASH(f) ((*((u_long *)(f)))&nqfheadhash) 55 56 union nqsrvthead nqthead; 57 struct nqlease **nqfhead; 58 u_long nqfheadhash; 59 time_t nqnfsstarttime = (time_t)0; 60 u_long nqnfs_prog, nqnfs_vers; 61 int nqsrv_clockskew = NQ_CLOCKSKEW; 62 int nqsrv_writeslack = NQ_WRITESLACK; 63 int nqsrv_maxlease = NQ_MAXLEASE; 64 int nqsrv_maxnumlease = NQ_MAXNUMLEASE; 65 void nqsrv_instimeq(), nqsrv_send_eviction(), nfs_sndunlock(); 66 void nqsrv_unlocklease(), nqsrv_waitfor_expiry(), nfsrv_slpderef(); 67 void nqsrv_addhost(), nqsrv_locklease(), nqnfs_serverd(); 68 void nqnfs_clientlease(); 69 struct mbuf *nfsm_rpchead(); 70 71 /* 72 * Signifies which rpcs can have piggybacked lease requests 73 */ 74 int nqnfs_piggy[NFS_NPROCS] = { 75 0, 76 NQL_READ, 77 NQL_WRITE, 78 0, 79 NQL_READ, 80 NQL_READ, 81 NQL_READ, 82 0, 83 NQL_WRITE, 84 0, 85 0, 86 0, 87 0, 88 0, 89 0, 90 0, 91 NQL_READ, 92 0, 93 NQL_READ, 94 0, 95 0, 96 0, 97 0, 98 }; 99 100 int nnnnnn = sizeof (struct nqlease); 101 int oooooo = sizeof (struct nfsnode); 102 extern nfstype nfs_type[9]; 103 extern struct nfssvc_sock *nfs_udpsock, *nfs_cltpsock; 104 extern struct nfsd nfsd_head; 105 extern int nfsd_waiting; 106 extern struct nfsreq nfsreqh; 107 108 #define TRUE 1 109 #define FALSE 0 110 111 /* 112 * Get or check for a lease for "vp", based on NQL_CHECK flag. 113 * The rules are as follows: 114 * - if a current non-caching lease, reply non-caching 115 * - if a current lease for same host only, extend lease 116 * - if a read cachable lease and a read lease request 117 * add host to list any reply cachable 118 * - else { set non-cachable for read-write sharing } 119 * send eviction notice messages to all other hosts that have lease 120 * wait for lease termination { either by receiving vacated messages 121 * from all the other hosts or expiry 122 * via. timeout } 123 * modify lease to non-cachable 124 * - else if no current lease, issue new one 125 * - reply 126 * - return boolean TRUE iff nam should be m_freem()'d 127 * NB: Since nqnfs_serverd() is called from a timer, any potential tsleep() 128 * in here must be framed by nqsrv_locklease() and nqsrv_unlocklease(). 129 * nqsrv_locklease() is coded such that at least one of LC_LOCKED and 130 * LC_WANTED is set whenever a process is tsleeping in it. The exception 131 * is when a new lease is being allocated, since it is not in the timer 132 * queue yet. (Ditto for the splsoftclock() and splx(s) calls) 133 */ 134 nqsrv_getlease(vp, duration, flags, nd, nam, cachablep, frev, cred) 135 struct vnode *vp; 136 u_long *duration; 137 int flags; 138 struct nfsd *nd; 139 struct mbuf *nam; 140 int *cachablep; 141 u_quad_t *frev; 142 struct ucred *cred; 143 { 144 register struct nqlease *lp, *lq, **lpp; 145 register struct nqhost *lph; 146 struct nqlease *tlp; 147 struct nqm **lphp; 148 struct vattr vattr; 149 fhandle_t fh; 150 int i, ok, error, s; 151 152 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) 153 return (0); 154 if (*duration > nqsrv_maxlease) 155 *duration = nqsrv_maxlease; 156 if (error = VOP_GETATTR(vp, &vattr, cred, nd->nd_procp)) 157 return (error); 158 *frev = vattr.va_filerev; 159 s = splsoftclock(); 160 tlp = vp->v_lease; 161 if ((flags & NQL_CHECK) == 0) 162 nfsstats.srvnqnfs_getleases++; 163 if (tlp == (struct nqlease *)0) { 164 165 /* 166 * Find the lease by searching the hash list. 167 */ 168 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 169 if (error = VFS_VPTOFH(vp, &fh.fh_fid)) { 170 splx(s); 171 return (error); 172 } 173 lpp = &nqfhead[NQFHHASH(fh.fh_fid.fid_data)]; 174 for (lp = *lpp; lp; lp = lp->lc_fhnext) 175 if (fh.fh_fsid.val[0] == lp->lc_fsid.val[0] && 176 fh.fh_fsid.val[1] == lp->lc_fsid.val[1] && 177 !bcmp(fh.fh_fid.fid_data, lp->lc_fiddata, 178 fh.fh_fid.fid_len - sizeof (long))) { 179 /* Found it */ 180 lp->lc_vp = vp; 181 vp->v_lease = lp; 182 tlp = lp; 183 break; 184 } 185 } 186 lp = tlp; 187 if (lp) { 188 if ((lp->lc_flag & LC_NONCACHABLE) || 189 (lp->lc_morehosts == (struct nqm *)0 && 190 nqsrv_cmpnam(nd->nd_slp, nam, &lp->lc_host))) 191 goto doreply; 192 if ((flags & NQL_READ) && (lp->lc_flag & LC_WRITE)==0) { 193 if (flags & NQL_CHECK) 194 goto doreply; 195 if (nqsrv_cmpnam(nd->nd_slp, nam, &lp->lc_host)) 196 goto doreply; 197 i = 0; 198 if (lp->lc_morehosts) { 199 lph = lp->lc_morehosts->lpm_hosts; 200 lphp = &lp->lc_morehosts->lpm_next; 201 ok = 1; 202 } else { 203 lphp = &lp->lc_morehosts; 204 ok = 0; 205 } 206 while (ok && (lph->lph_flag & LC_VALID)) { 207 if (nqsrv_cmpnam(nd->nd_slp, nam, lph)) 208 goto doreply; 209 if (++i == LC_MOREHOSTSIZ) { 210 i = 0; 211 if (*lphp) { 212 lph = (*lphp)->lpm_hosts; 213 lphp = &((*lphp)->lpm_next); 214 } else 215 ok = 0; 216 } else 217 lph++; 218 } 219 nqsrv_locklease(lp); 220 if (!ok) { 221 *lphp = (struct nqm *) 222 malloc(sizeof (struct nqm), 223 M_NQMHOST, M_WAITOK); 224 bzero((caddr_t)*lphp, sizeof (struct nqm)); 225 lph = (*lphp)->lpm_hosts; 226 } 227 nqsrv_addhost(lph, nd->nd_slp, nam); 228 nqsrv_unlocklease(lp); 229 } else { 230 lp->lc_flag |= LC_NONCACHABLE; 231 nqsrv_locklease(lp); 232 nqsrv_send_eviction(vp, lp, nd->nd_slp, nam, cred); 233 nqsrv_waitfor_expiry(lp); 234 nqsrv_unlocklease(lp); 235 } 236 doreply: 237 /* 238 * Update the lease and return 239 */ 240 if ((flags & NQL_CHECK) == 0) 241 nqsrv_instimeq(lp, *duration); 242 if (lp->lc_flag & LC_NONCACHABLE) 243 *cachablep = 0; 244 else { 245 *cachablep = 1; 246 if (flags & NQL_WRITE) 247 lp->lc_flag |= LC_WRITTEN; 248 } 249 splx(s); 250 return (0); 251 } 252 splx(s); 253 if (flags & NQL_CHECK) 254 return (0); 255 256 /* 257 * Allocate new lease 258 * The value of nqsrv_maxnumlease should be set generously, so that 259 * the following "printf" happens infrequently. 260 */ 261 if (nfsstats.srvnqnfs_leases > nqsrv_maxnumlease) { 262 printf("Nqnfs server, too many leases\n"); 263 do { 264 (void) tsleep((caddr_t)&lbolt, PSOCK, 265 "nqsrvnuml", 0); 266 } while (nfsstats.srvnqnfs_leases > nqsrv_maxnumlease); 267 } 268 MALLOC(lp, struct nqlease *, sizeof (struct nqlease), M_NQLEASE, M_WAITOK); 269 bzero((caddr_t)lp, sizeof (struct nqlease)); 270 if (flags & NQL_WRITE) 271 lp->lc_flag |= (LC_WRITE | LC_WRITTEN); 272 nqsrv_addhost(&lp->lc_host, nd->nd_slp, nam); 273 lp->lc_vp = vp; 274 lp->lc_fsid = fh.fh_fsid; 275 bcopy(fh.fh_fid.fid_data, lp->lc_fiddata, fh.fh_fid.fid_len - sizeof (long)); 276 if (lq = *lpp) 277 lq->lc_fhprev = &lp->lc_fhnext; 278 lp->lc_fhnext = lq; 279 lp->lc_fhprev = lpp; 280 *lpp = lp; 281 vp->v_lease = lp; 282 s = splsoftclock(); 283 nqsrv_instimeq(lp, *duration); 284 splx(s); 285 *cachablep = 1; 286 if (++nfsstats.srvnqnfs_leases > nfsstats.srvnqnfs_maxleases) 287 nfsstats.srvnqnfs_maxleases = nfsstats.srvnqnfs_leases; 288 return (0); 289 } 290 291 /* 292 * Local lease check for server syscalls. 293 * Just set up args and let nqsrv_getlease() do the rest. 294 */ 295 void 296 lease_check(vp, p, cred, flag) 297 struct vnode *vp; 298 struct proc *p; 299 struct ucred *cred; 300 int flag; 301 { 302 int duration = 0, cache; 303 struct nfsd nfsd; 304 u_quad_t frev; 305 306 nfsd.nd_slp = NQLOCALSLP; 307 nfsd.nd_procp = p; 308 (void) nqsrv_getlease(vp, &duration, NQL_CHECK | flag, &nfsd, 309 (struct mbuf *)0, &cache, &frev, cred); 310 } 311 312 /* 313 * Add a host to an nqhost structure for a lease. 314 */ 315 void 316 nqsrv_addhost(lph, slp, nam) 317 register struct nqhost *lph; 318 struct nfssvc_sock *slp; 319 struct mbuf *nam; 320 { 321 register struct sockaddr_in *saddr; 322 323 if (slp == NQLOCALSLP) 324 lph->lph_flag |= (LC_VALID | LC_LOCAL); 325 else if (slp == nfs_udpsock) { 326 saddr = mtod(nam, struct sockaddr_in *); 327 lph->lph_flag |= (LC_VALID | LC_UDP); 328 lph->lph_inetaddr = saddr->sin_addr.s_addr; 329 lph->lph_port = saddr->sin_port; 330 } else if (slp == nfs_cltpsock) { 331 lph->lph_nam = m_copym(nam, 0, M_COPYALL, M_WAIT); 332 lph->lph_flag |= (LC_VALID | LC_CLTP); 333 } else { 334 lph->lph_flag |= (LC_VALID | LC_SREF); 335 lph->lph_slp = slp; 336 slp->ns_sref++; 337 } 338 } 339 340 /* 341 * Update the lease expiry time and position it in the timer queue correctly. 342 */ 343 void 344 nqsrv_instimeq(lp, duration) 345 register struct nqlease *lp; 346 u_long duration; 347 { 348 register struct nqlease *tlp; 349 time_t newexpiry; 350 351 newexpiry = time.tv_sec + duration + nqsrv_clockskew; 352 if (lp->lc_expiry == newexpiry) 353 return; 354 if (lp->lc_chain1[0]) 355 remque(lp); 356 lp->lc_expiry = newexpiry; 357 358 /* 359 * Find where in the queue it should be. 360 */ 361 tlp = nqthead.th_chain[1]; 362 while (tlp->lc_expiry > newexpiry && tlp != (struct nqlease *)&nqthead) 363 tlp = tlp->lc_chain1[1]; 364 if (tlp == nqthead.th_chain[1]) 365 NQSTORENOVRAM(newexpiry); 366 insque(lp, tlp); 367 } 368 369 /* 370 * Compare the requesting host address with the lph entry in the lease. 371 * Return true iff it is the same. 372 * This is somewhat messy due to the union in the nqhost structure. 373 * The local host is indicated by the special value of NQLOCALSLP for slp. 374 */ 375 nqsrv_cmpnam(slp, nam, lph) 376 register struct nfssvc_sock *slp; 377 struct mbuf *nam; 378 register struct nqhost *lph; 379 { 380 register struct sockaddr_in *saddr; 381 struct mbuf *addr; 382 union nethostaddr lhaddr; 383 int ret; 384 385 if (slp == NQLOCALSLP) { 386 if (lph->lph_flag & LC_LOCAL) 387 return (1); 388 else 389 return (0); 390 } 391 if (slp == nfs_udpsock || slp == nfs_cltpsock) 392 addr = nam; 393 else 394 addr = slp->ns_nam; 395 if (lph->lph_flag & LC_UDP) 396 ret = netaddr_match(AF_INET, &lph->lph_haddr, addr); 397 else if (lph->lph_flag & LC_CLTP) 398 ret = netaddr_match(AF_ISO, &lph->lph_claddr, 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, addr); 408 } 409 return (ret); 410 } 411 412 /* 413 * Send out eviction notice messages to all other hosts for the lease. 414 */ 415 void 416 nqsrv_send_eviction(vp, lp, slp, nam, cred) 417 struct vnode *vp; 418 register struct nqlease *lp; 419 struct nfssvc_sock *slp; 420 struct mbuf *nam; 421 struct ucred *cred; 422 { 423 register struct nqhost *lph = &lp->lc_host; 424 register struct mbuf *m; 425 register int siz; 426 struct nqm *lphnext = lp->lc_morehosts; 427 struct mbuf *mreq, *mb, *mb2, *nam2, *mheadend; 428 struct socket *so; 429 struct sockaddr_in *saddr; 430 fhandle_t *fhp; 431 caddr_t bpos, cp; 432 u_long xid; 433 int len = 1, ok = 1, i = 0; 434 int sotype, *solockp; 435 436 while (ok && (lph->lph_flag & LC_VALID)) { 437 if (nqsrv_cmpnam(slp, nam, lph)) 438 lph->lph_flag |= LC_VACATED; 439 else if ((lph->lph_flag & (LC_LOCAL | LC_VACATED)) == 0) { 440 if (lph->lph_flag & LC_UDP) { 441 MGET(nam2, M_WAIT, MT_SONAME); 442 saddr = mtod(nam2, struct sockaddr_in *); 443 nam2->m_len = saddr->sin_len = 444 sizeof (struct sockaddr_in); 445 saddr->sin_family = AF_INET; 446 saddr->sin_addr.s_addr = lph->lph_inetaddr; 447 saddr->sin_port = lph->lph_port; 448 so = nfs_udpsock->ns_so; 449 } else if (lph->lph_flag & LC_CLTP) { 450 nam2 = lph->lph_nam; 451 so = nfs_cltpsock->ns_so; 452 } else if (lph->lph_slp->ns_flag & SLP_VALID) { 453 nam2 = (struct mbuf *)0; 454 so = lph->lph_slp->ns_so; 455 } else 456 goto nextone; 457 sotype = so->so_type; 458 if (so->so_proto->pr_flags & PR_CONNREQUIRED) 459 solockp = &lph->lph_slp->ns_solock; 460 else 461 solockp = (int *)0; 462 nfsm_reqhead((struct vnode *)0, NQNFSPROC_EVICTED, 463 NFSX_FH); 464 nfsm_build(cp, caddr_t, NFSX_FH); 465 bzero(cp, NFSX_FH); 466 fhp = (fhandle_t *)cp; 467 fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid; 468 VFS_VPTOFH(vp, &fhp->fh_fid); 469 m = mreq; 470 siz = 0; 471 while (m) { 472 siz += m->m_len; 473 m = m->m_next; 474 } 475 if (siz <= 0 || siz > NFS_MAXPACKET) { 476 printf("mbuf siz=%d\n",siz); 477 panic("Bad nfs svc reply"); 478 } 479 m = nfsm_rpchead(cred, TRUE, NQNFSPROC_EVICTED, 480 RPCAUTH_UNIX, 5*NFSX_UNSIGNED, (char *)0, 481 mreq, siz, &mheadend, &xid); 482 /* 483 * For stream protocols, prepend a Sun RPC 484 * Record Mark. 485 */ 486 if (sotype == SOCK_STREAM) { 487 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 488 *mtod(m, u_long *) = htonl(0x80000000 | 489 (m->m_pkthdr.len - NFSX_UNSIGNED)); 490 } 491 if (((lph->lph_flag & (LC_UDP | LC_CLTP)) == 0 && 492 (lph->lph_slp->ns_flag & SLP_VALID) == 0) || 493 (solockp && (*solockp & NFSMNT_SNDLOCK))) 494 m_freem(m); 495 else { 496 if (solockp) 497 *solockp |= NFSMNT_SNDLOCK; 498 (void) nfs_send(so, nam2, m, 499 (struct nfsreq *)0); 500 if (solockp) 501 nfs_sndunlock(solockp); 502 } 503 if (lph->lph_flag & LC_UDP) 504 MFREE(nam2, m); 505 } 506 nextone: 507 if (++i == len) { 508 if (lphnext) { 509 i = 0; 510 len = LC_MOREHOSTSIZ; 511 lph = lphnext->lpm_hosts; 512 lphnext = lphnext->lpm_next; 513 } else 514 ok = 0; 515 } else 516 lph++; 517 } 518 } 519 520 /* 521 * Wait for the lease to expire. 522 * This will occur when all clients have sent "vacated" messages to 523 * this server OR when it expires do to timeout. 524 */ 525 void 526 nqsrv_waitfor_expiry(lp) 527 register struct nqlease *lp; 528 { 529 register struct nqhost *lph; 530 register int i; 531 struct nqm *lphnext; 532 int len, ok; 533 534 tryagain: 535 if (time.tv_sec > lp->lc_expiry) 536 return; 537 lph = &lp->lc_host; 538 lphnext = lp->lc_morehosts; 539 len = 1; 540 i = 0; 541 ok = 1; 542 while (ok && (lph->lph_flag & LC_VALID)) { 543 if ((lph->lph_flag & (LC_LOCAL | LC_VACATED)) == 0) { 544 lp->lc_flag |= LC_EXPIREDWANTED; 545 (void) tsleep((caddr_t)&lp->lc_flag, PSOCK, 546 "nqexp", 0); 547 goto tryagain; 548 } 549 if (++i == len) { 550 if (lphnext) { 551 i = 0; 552 len = LC_MOREHOSTSIZ; 553 lph = lphnext->lpm_hosts; 554 lphnext = lphnext->lpm_next; 555 } else 556 ok = 0; 557 } else 558 lph++; 559 } 560 } 561 562 /* 563 * Nqnfs server timer that maintains the server lease queue. 564 * Scan the lease queue for expired entries: 565 * - when one is found, wakeup anyone waiting for it 566 * else dequeue and free 567 */ 568 void 569 nqnfs_serverd() 570 { 571 register struct nqlease *lp, *lq; 572 register struct nqhost *lph; 573 struct nqlease *nextlp; 574 struct nqm *lphnext, *olphnext; 575 struct mbuf *n; 576 union nqsrvthead *lhp; 577 int i, len, ok; 578 579 lp = nqthead.th_chain[0]; 580 while (lp != (struct nqlease *)&nqthead) { 581 if (lp->lc_expiry >= time.tv_sec) 582 break; 583 nextlp = lp->lc_chain1[0]; 584 if (lp->lc_flag & LC_EXPIREDWANTED) { 585 lp->lc_flag &= ~LC_EXPIREDWANTED; 586 wakeup((caddr_t)&lp->lc_flag); 587 } else if ((lp->lc_flag & (LC_LOCKED | LC_WANTED)) == 0) { 588 /* 589 * Make a best effort at keeping a write caching lease long 590 * enough by not deleting it until it has been explicitly 591 * vacated or there have been no writes in the previous 592 * write_slack seconds since expiry and the nfsds are not 593 * all busy. The assumption is that if the nfsds are not 594 * all busy now (no queue of nfs requests), then the client 595 * would have been able to do at least one write to the 596 * file during the last write_slack seconds if it was still 597 * trying to push writes to the server. 598 */ 599 if ((lp->lc_flag & (LC_WRITE | LC_VACATED)) == LC_WRITE && 600 ((lp->lc_flag & LC_WRITTEN) || nfsd_waiting == 0)) { 601 lp->lc_flag &= ~LC_WRITTEN; 602 nqsrv_instimeq(lp, nqsrv_writeslack); 603 } else { 604 remque(lp); 605 if (lq = lp->lc_fhnext) 606 lq->lc_fhprev = lp->lc_fhprev; 607 *lp->lc_fhprev = lq; 608 /* 609 * This soft reference may no longer be valid, but 610 * no harm done. The worst case is if the vnode was 611 * recycled and has another valid lease reference, 612 * which is dereferenced prematurely. 613 */ 614 lp->lc_vp->v_lease = (struct nqlease *)0; 615 lph = &lp->lc_host; 616 lphnext = lp->lc_morehosts; 617 olphnext = (struct nqm *)0; 618 len = 1; 619 i = 0; 620 ok = 1; 621 while (ok && (lph->lph_flag & LC_VALID)) { 622 if (lph->lph_flag & LC_CLTP) 623 MFREE(lph->lph_nam, n); 624 if (lph->lph_flag & LC_SREF) 625 nfsrv_slpderef(lph->lph_slp); 626 if (++i == len) { 627 if (olphnext) { 628 free((caddr_t)olphnext, M_NQMHOST); 629 olphnext = (struct nqm *)0; 630 } 631 if (lphnext) { 632 olphnext = lphnext; 633 i = 0; 634 len = LC_MOREHOSTSIZ; 635 lph = lphnext->lpm_hosts; 636 lphnext = lphnext->lpm_next; 637 } else 638 ok = 0; 639 } else 640 lph++; 641 } 642 FREE((caddr_t)lp, M_NQLEASE); 643 if (olphnext) 644 free((caddr_t)olphnext, M_NQMHOST); 645 nfsstats.srvnqnfs_leases--; 646 } 647 } 648 lp = nextlp; 649 } 650 } 651 652 /* 653 * Called from nfssvc_nfsd() for a getlease rpc request. 654 * Do the from/to xdr translation and call nqsrv_getlease() to 655 * do the real work. 656 */ 657 nqnfsrv_getlease(nfsd, mrep, md, dpos, cred, nam, mrq) 658 struct nfsd *nfsd; 659 struct mbuf *mrep, *md; 660 caddr_t dpos; 661 struct ucred *cred; 662 struct mbuf *nam, **mrq; 663 { 664 register struct nfsv2_fattr *fp; 665 struct vattr va; 666 register struct vattr *vap = &va; 667 struct vnode *vp; 668 nfsv2fh_t nfh; 669 fhandle_t *fhp; 670 register u_long *tl; 671 register long t1; 672 u_quad_t frev; 673 caddr_t bpos; 674 int error = 0; 675 char *cp2; 676 struct mbuf *mb, *mb2, *mreq; 677 int flags, rdonly, cache; 678 679 fhp = &nfh.fh_generic; 680 nfsm_srvmtofh(fhp); 681 nfsm_dissect(tl, u_long *, 2*NFSX_UNSIGNED); 682 flags = fxdr_unsigned(int, *tl++); 683 nfsd->nd_duration = fxdr_unsigned(int, *tl); 684 if (error = nfsrv_fhtovp(fhp, TRUE, &vp, cred, nfsd->nd_slp, nam, &rdonly)) 685 nfsm_reply(0); 686 if (rdonly && flags == NQL_WRITE) { 687 error = EROFS; 688 nfsm_reply(0); 689 } 690 (void) nqsrv_getlease(vp, &nfsd->nd_duration, flags, nfsd, 691 nam, &cache, &frev, cred); 692 error = VOP_GETATTR(vp, vap, cred, nfsd->nd_procp); 693 vput(vp); 694 nfsm_reply(NFSX_NQFATTR + 4*NFSX_UNSIGNED); 695 nfsm_build(tl, u_long *, 4*NFSX_UNSIGNED); 696 *tl++ = txdr_unsigned(cache); 697 *tl++ = txdr_unsigned(nfsd->nd_duration); 698 txdr_hyper(&frev, tl); 699 nfsm_build(fp, struct nfsv2_fattr *, NFSX_NQFATTR); 700 nfsm_srvfillattr; 701 nfsm_srvdone; 702 } 703 704 /* 705 * Called from nfssvc_nfsd() when a "vacated" message is received from a 706 * client. Find the entry and expire it. 707 */ 708 nqnfsrv_vacated(nfsd, mrep, md, dpos, cred, nam, mrq) 709 struct nfsd *nfsd; 710 struct mbuf *mrep, *md; 711 caddr_t dpos; 712 struct ucred *cred; 713 struct mbuf *nam, **mrq; 714 { 715 register struct nqlease *lp; 716 register struct nqhost *lph; 717 struct nqlease *tlp = (struct nqlease *)0; 718 struct vnode *vp; 719 nfsv2fh_t nfh; 720 fhandle_t *fhp; 721 register u_long *tl; 722 register long t1; 723 struct nqm *lphnext; 724 union nqsrvthead *lhp; 725 u_quad_t frev; 726 int error = 0, i, len, ok, rdonly, gotit = 0; 727 char *cp2; 728 729 fhp = &nfh.fh_generic; 730 nfsm_srvmtofh(fhp); 731 m_freem(mrep); 732 /* 733 * Find the lease by searching the hash list. 734 */ 735 for (lp = nqfhead[NQFHHASH(fhp->fh_fid.fid_data)]; lp; 736 lp = lp->lc_fhnext) 737 if (fhp->fh_fsid.val[0] == lp->lc_fsid.val[0] && 738 fhp->fh_fsid.val[1] == lp->lc_fsid.val[1] && 739 !bcmp(fhp->fh_fid.fid_data, lp->lc_fiddata, 740 MAXFIDSZ)) { 741 /* Found it */ 742 tlp = lp; 743 break; 744 } 745 if (tlp) { 746 lp = tlp; 747 len = 1; 748 i = 0; 749 lph = &lp->lc_host; 750 lphnext = lp->lc_morehosts; 751 ok = 1; 752 while (ok && (lph->lph_flag & LC_VALID)) { 753 if (nqsrv_cmpnam(nfsd->nd_slp, nam, lph)) { 754 lph->lph_flag |= LC_VACATED; 755 gotit++; 756 break; 757 } 758 if (++i == len) { 759 if (lphnext) { 760 len = LC_MOREHOSTSIZ; 761 i = 0; 762 lph = lphnext->lpm_hosts; 763 lphnext = lphnext->lpm_next; 764 } else 765 ok = 0; 766 } else 767 lph++; 768 } 769 if ((lp->lc_flag & LC_EXPIREDWANTED) && gotit) { 770 lp->lc_flag &= ~LC_EXPIREDWANTED; 771 wakeup((caddr_t)&lp->lc_flag); 772 } 773 nfsmout: 774 return (EPERM); 775 } 776 return (EPERM); 777 } 778 779 /* 780 * Client get lease rpc function. 781 */ 782 nqnfs_getlease(vp, rwflag, cred, p) 783 register struct vnode *vp; 784 int rwflag; 785 struct ucred *cred; 786 struct proc *p; 787 { 788 register u_long *tl; 789 register caddr_t cp; 790 register long t1; 791 register struct nfsnode *np, *tp; 792 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 793 caddr_t bpos, dpos, cp2; 794 time_t reqtime; 795 int error = 0; 796 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 797 int cachable; 798 u_quad_t frev; 799 800 nfsstats.rpccnt[NQNFSPROC_GETLEASE]++; 801 mb = mreq = nfsm_reqh(vp, NQNFSPROC_GETLEASE, NFSX_FH+2*NFSX_UNSIGNED, 802 &bpos); 803 nfsm_fhtom(vp); 804 nfsm_build(tl, u_long *, 2*NFSX_UNSIGNED); 805 *tl++ = txdr_unsigned(rwflag); 806 *tl = txdr_unsigned(nmp->nm_leaseterm); 807 reqtime = time.tv_sec; 808 nfsm_request(vp, NQNFSPROC_GETLEASE, p, cred); 809 np = VTONFS(vp); 810 nfsm_dissect(tl, u_long *, 4*NFSX_UNSIGNED); 811 cachable = fxdr_unsigned(int, *tl++); 812 reqtime += fxdr_unsigned(int, *tl++); 813 if (reqtime > time.tv_sec) { 814 fxdr_hyper(tl, &frev); 815 nqnfs_clientlease(nmp, np, rwflag, cachable, reqtime, frev); 816 nfsm_loadattr(vp, (struct vattr *)0); 817 } else 818 error = NQNFS_EXPIRED; 819 nfsm_reqdone; 820 return (error); 821 } 822 823 /* 824 * Client vacated message function. 825 */ 826 nqnfs_vacated(vp, cred) 827 register struct vnode *vp; 828 struct ucred *cred; 829 { 830 register caddr_t cp; 831 register struct mbuf *m; 832 register int i; 833 caddr_t bpos; 834 u_long xid; 835 int error = 0; 836 struct mbuf *mreq, *mb, *mb2, *mheadend; 837 struct nfsmount *nmp; 838 struct nfsreq myrep; 839 840 nmp = VFSTONFS(vp->v_mount); 841 nfsstats.rpccnt[NQNFSPROC_VACATED]++; 842 nfsm_reqhead(vp, NQNFSPROC_VACATED, NFSX_FH); 843 nfsm_fhtom(vp); 844 m = mreq; 845 i = 0; 846 while (m) { 847 i += m->m_len; 848 m = m->m_next; 849 } 850 m = nfsm_rpchead(cred, TRUE, NQNFSPROC_VACATED, 851 RPCAUTH_UNIX, 5*NFSX_UNSIGNED, (char *)0, 852 mreq, i, &mheadend, &xid); 853 if (nmp->nm_sotype == SOCK_STREAM) { 854 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 855 *mtod(m, u_long *) = htonl(0x80000000 | (m->m_pkthdr.len - 856 NFSX_UNSIGNED)); 857 } 858 myrep.r_flags = 0; 859 myrep.r_nmp = nmp; 860 if (nmp->nm_soflags & PR_CONNREQUIRED) 861 (void) nfs_sndlock(&nmp->nm_flag, (struct nfsreq *)0); 862 (void) nfs_send(nmp->nm_so, nmp->nm_nam, m, &myrep); 863 if (nmp->nm_soflags & PR_CONNREQUIRED) 864 nfs_sndunlock(&nmp->nm_flag); 865 return (error); 866 } 867 868 /* 869 * Called for client side callbacks 870 */ 871 nqnfs_callback(nmp, mrep, md, dpos) 872 struct nfsmount *nmp; 873 struct mbuf *mrep, *md; 874 caddr_t dpos; 875 { 876 register struct vnode *vp; 877 register u_long *tl; 878 register long t1; 879 nfsv2fh_t nfh; 880 fhandle_t *fhp; 881 struct nfsnode *np; 882 struct nfsd nd; 883 int error; 884 char *cp2; 885 886 nd.nd_mrep = mrep; 887 nd.nd_md = md; 888 nd.nd_dpos = dpos; 889 if (error = nfs_getreq(&nd, FALSE)) 890 return (error); 891 md = nd.nd_md; 892 dpos = nd.nd_dpos; 893 if (nd.nd_procnum != NQNFSPROC_EVICTED) { 894 m_freem(mrep); 895 return (EPERM); 896 } 897 fhp = &nfh.fh_generic; 898 nfsm_srvmtofh(fhp); 899 m_freem(mrep); 900 if (error = nfs_nget(nmp->nm_mountp, fhp, &np)) 901 return (error); 902 vp = NFSTOV(np); 903 if (np->n_tnext) { 904 np->n_expiry = 0; 905 np->n_flag |= NQNFSEVICTED; 906 if (np->n_tprev != (struct nfsnode *)nmp) { 907 if (np->n_tnext == (struct nfsnode *)nmp) 908 nmp->nm_tprev = np->n_tprev; 909 else 910 np->n_tnext->n_tprev = np->n_tprev; 911 np->n_tprev->n_tnext = np->n_tnext; 912 np->n_tnext = nmp->nm_tnext; 913 nmp->nm_tnext = np; 914 np->n_tprev = (struct nfsnode *)nmp; 915 if (np->n_tnext == (struct nfsnode *)nmp) 916 nmp->nm_tprev = np; 917 else 918 np->n_tnext->n_tprev = np; 919 } 920 } 921 vrele(vp); 922 nfsm_srvdone; 923 } 924 925 /* 926 * Nqnfs client helper daemon. Runs once a second to expire leases. 927 * It also get authorization strings for "kerb" mounts. 928 * It must start at the beginning of the list again after any potential 929 * "sleep" since nfs_reclaim() called from vclean() can pull a node off 930 * the list asynchronously. 931 */ 932 nqnfs_clientd(nmp, cred, ncd, flag, argp, p) 933 register struct nfsmount *nmp; 934 struct ucred *cred; 935 struct nfsd_cargs *ncd; 936 int flag; 937 caddr_t argp; 938 struct proc *p; 939 { 940 register struct nfsnode *np; 941 struct vnode *vp; 942 struct nfsreq myrep; 943 int error, vpid; 944 945 /* 946 * First initialize some variables 947 */ 948 nqnfs_prog = txdr_unsigned(NQNFS_PROG); 949 nqnfs_vers = txdr_unsigned(NQNFS_VER1); 950 951 /* 952 * If an authorization string is being passed in, get it. 953 */ 954 if ((flag & NFSSVC_GOTAUTH) && 955 (nmp->nm_flag & (NFSMNT_WAITAUTH | NFSMNT_DISMNT)) == 0) { 956 if (nmp->nm_flag & NFSMNT_HASAUTH) 957 panic("cld kerb"); 958 if ((flag & NFSSVC_AUTHINFAIL) == 0) { 959 if (ncd->ncd_authlen <= RPCAUTH_MAXSIZ && 960 copyin(ncd->ncd_authstr, nmp->nm_authstr, 961 ncd->ncd_authlen) == 0) { 962 nmp->nm_authtype = ncd->ncd_authtype; 963 nmp->nm_authlen = ncd->ncd_authlen; 964 } else 965 nmp->nm_flag |= NFSMNT_AUTHERR; 966 } else 967 nmp->nm_flag |= NFSMNT_AUTHERR; 968 nmp->nm_flag |= NFSMNT_HASAUTH; 969 wakeup((caddr_t)&nmp->nm_authlen); 970 } else 971 nmp->nm_flag |= NFSMNT_WAITAUTH; 972 973 /* 974 * Loop every second updating queue until there is a termination sig. 975 */ 976 while ((nmp->nm_flag & NFSMNT_DISMNT) == 0) { 977 if (nmp->nm_flag & NFSMNT_NQNFS) { 978 /* 979 * If there are no outstanding requests (and therefore no 980 * processes in nfs_reply) and there is data in the receive 981 * queue, poke for callbacks. 982 */ 983 if (nfsreqh.r_next == &nfsreqh && nmp->nm_so && 984 nmp->nm_so->so_rcv.sb_cc > 0) { 985 myrep.r_flags = R_GETONEREP; 986 myrep.r_nmp = nmp; 987 myrep.r_mrep = (struct mbuf *)0; 988 myrep.r_procp = (struct proc *)0; 989 (void) nfs_reply(&myrep); 990 } 991 992 /* 993 * Loop through the leases, updating as required. 994 */ 995 np = nmp->nm_tnext; 996 while (np != (struct nfsnode *)nmp && 997 (nmp->nm_flag & NFSMNT_DISMINPROG) == 0) { 998 vp = NFSTOV(np); 999 if (vp->v_mount->mnt_stat.f_fsid.val[1] != MOUNT_NFS) panic("trash2"); 1000 vpid = vp->v_id; 1001 if (np->n_expiry < time.tv_sec) { 1002 if (vget(vp) == 0) { 1003 nmp->nm_inprog = vp; 1004 if (vpid == vp->v_id) { 1005 if (vp->v_mount->mnt_stat.f_fsid.val[1] != MOUNT_NFS) panic("trash3"); 1006 if (np->n_tnext == (struct nfsnode *)nmp) 1007 nmp->nm_tprev = np->n_tprev; 1008 else 1009 np->n_tnext->n_tprev = np->n_tprev; 1010 if (np->n_tprev == (struct nfsnode *)nmp) 1011 nmp->nm_tnext = np->n_tnext; 1012 else 1013 np->n_tprev->n_tnext = np->n_tnext; 1014 np->n_tnext = (struct nfsnode *)0; 1015 if ((np->n_flag & (NMODIFIED | NQNFSEVICTED)) 1016 && vp->v_type == VREG) { 1017 if (np->n_flag & NQNFSEVICTED) { 1018 (void) nfs_vinvalbuf(vp, 1019 V_SAVE, cred, p, 0); 1020 np->n_flag &= ~NQNFSEVICTED; 1021 (void) nqnfs_vacated(vp, cred); 1022 } else { 1023 (void) VOP_FSYNC(vp, cred, 1024 MNT_WAIT, p); 1025 np->n_flag &= ~NMODIFIED; 1026 } 1027 } 1028 } 1029 vrele(vp); 1030 nmp->nm_inprog = NULLVP; 1031 } 1032 if (np != nmp->nm_tnext) 1033 np = nmp->nm_tnext; 1034 else 1035 break; 1036 } else if ((np->n_expiry - NQ_RENEWAL) < time.tv_sec) { 1037 if ((np->n_flag & (NQNFSWRITE | NQNFSNONCACHE)) 1038 == NQNFSWRITE && vp->v_dirtyblkhd.le_next && 1039 vget(vp) == 0) { 1040 nmp->nm_inprog = vp; 1041 if (vp->v_mount->mnt_stat.f_fsid.val[1] != MOUNT_NFS) panic("trash4"); 1042 if (vpid == vp->v_id && 1043 nqnfs_getlease(vp, NQL_WRITE, cred, p)==0) 1044 np->n_brev = np->n_lrev; 1045 vrele(vp); 1046 nmp->nm_inprog = NULLVP; 1047 } 1048 if (np != nmp->nm_tnext) 1049 np = nmp->nm_tnext; 1050 else 1051 break; 1052 } else 1053 break; 1054 } 1055 } 1056 1057 /* 1058 * Get an authorization string, if required. 1059 */ 1060 if ((nmp->nm_flag & (NFSMNT_WAITAUTH | NFSMNT_DISMNT | NFSMNT_HASAUTH)) == 0) { 1061 ncd->ncd_authuid = nmp->nm_authuid; 1062 if (copyout((caddr_t)ncd, argp, sizeof (struct nfsd_cargs))) 1063 nmp->nm_flag |= NFSMNT_WAITAUTH; 1064 else 1065 return (ENEEDAUTH); 1066 } 1067 1068 /* 1069 * Wait a bit (no pun) and do it again. 1070 */ 1071 if ((nmp->nm_flag & NFSMNT_DISMNT) == 0 && 1072 (nmp->nm_flag & (NFSMNT_WAITAUTH | NFSMNT_HASAUTH))) { 1073 error = tsleep((caddr_t)&nmp->nm_authstr, PSOCK | PCATCH, 1074 "nqnfstimr", hz / 3); 1075 if (error == EINTR || error == ERESTART) 1076 (void) dounmount(nmp->nm_mountp, 0, p); 1077 } 1078 } 1079 free((caddr_t)nmp, M_NFSMNT); 1080 if (error == EWOULDBLOCK) 1081 error = 0; 1082 return (error); 1083 } 1084 1085 /* 1086 * Adjust all timer queue expiry times when the time of day clock is changed. 1087 * Called from the settimeofday() syscall. 1088 */ 1089 void 1090 lease_updatetime(deltat) 1091 register int deltat; 1092 { 1093 register struct nqlease *lp; 1094 register struct nfsnode *np; 1095 struct mount *mp; 1096 struct nfsmount *nmp; 1097 int s; 1098 1099 if (nqnfsstarttime != 0) 1100 nqnfsstarttime += deltat; 1101 s = splsoftclock(); 1102 lp = nqthead.th_chain[0]; 1103 while (lp != (struct nqlease *)&nqthead) { 1104 lp->lc_expiry += deltat; 1105 lp = lp->lc_chain1[0]; 1106 } 1107 splx(s); 1108 1109 /* 1110 * Search the mount list for all nqnfs mounts and do their timer 1111 * queues. 1112 */ 1113 mp = rootfs; 1114 do { 1115 if (mp->mnt_stat.f_fsid.val[1] == MOUNT_NFS) { 1116 nmp = VFSTONFS(mp); 1117 if (nmp->nm_flag & NFSMNT_NQNFS) { 1118 np = nmp->nm_tnext; 1119 while (np != (struct nfsnode *)nmp) { 1120 np->n_expiry += deltat; 1121 np = np->n_tnext; 1122 } 1123 } 1124 } 1125 mp = mp->mnt_next; 1126 } while (mp != rootfs); 1127 } 1128 1129 /* 1130 * Lock a server lease. 1131 */ 1132 void 1133 nqsrv_locklease(lp) 1134 struct nqlease *lp; 1135 { 1136 1137 while (lp->lc_flag & LC_LOCKED) { 1138 lp->lc_flag |= LC_WANTED; 1139 (void) tsleep((caddr_t)lp, PSOCK, "nqlc", 0); 1140 } 1141 lp->lc_flag |= LC_LOCKED; 1142 lp->lc_flag &= ~LC_WANTED; 1143 } 1144 1145 /* 1146 * Unlock a server lease. 1147 */ 1148 void 1149 nqsrv_unlocklease(lp) 1150 struct nqlease *lp; 1151 { 1152 1153 lp->lc_flag &= ~LC_LOCKED; 1154 if (lp->lc_flag & LC_WANTED) 1155 wakeup((caddr_t)lp); 1156 } 1157 1158 /* 1159 * Update a client lease. 1160 */ 1161 void 1162 nqnfs_clientlease(nmp, np, rwflag, cachable, expiry, frev) 1163 register struct nfsmount *nmp; 1164 register struct nfsnode *np; 1165 int rwflag, cachable; 1166 time_t expiry; 1167 u_quad_t frev; 1168 { 1169 register struct nfsnode *tp; 1170 1171 if (np->n_tnext) { 1172 if (np->n_tnext == (struct nfsnode *)nmp) 1173 nmp->nm_tprev = np->n_tprev; 1174 else 1175 np->n_tnext->n_tprev = np->n_tprev; 1176 if (np->n_tprev == (struct nfsnode *)nmp) 1177 nmp->nm_tnext = np->n_tnext; 1178 else 1179 np->n_tprev->n_tnext = np->n_tnext; 1180 if (rwflag == NQL_WRITE) 1181 np->n_flag |= NQNFSWRITE; 1182 } else if (rwflag == NQL_READ) 1183 np->n_flag &= ~NQNFSWRITE; 1184 else 1185 np->n_flag |= NQNFSWRITE; 1186 if (cachable) 1187 np->n_flag &= ~NQNFSNONCACHE; 1188 else 1189 np->n_flag |= NQNFSNONCACHE; 1190 np->n_expiry = expiry; 1191 np->n_lrev = frev; 1192 tp = nmp->nm_tprev; 1193 while (tp != (struct nfsnode *)nmp && tp->n_expiry > np->n_expiry) 1194 tp = tp->n_tprev; 1195 if (tp == (struct nfsnode *)nmp) { 1196 np->n_tnext = nmp->nm_tnext; 1197 nmp->nm_tnext = np; 1198 } else { 1199 np->n_tnext = tp->n_tnext; 1200 tp->n_tnext = np; 1201 } 1202 np->n_tprev = tp; 1203 if (np->n_tnext == (struct nfsnode *)nmp) 1204 nmp->nm_tprev = np; 1205 else 1206 np->n_tnext->n_tprev = np; 1207 } 1208