Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/nfsserver/nfs_syscalls.c
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1 /*- 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Rick Macklem at The University of Guelph. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)nfs_syscalls.c 8.5 (Berkeley) 3/30/95 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include "opt_inet6.h" 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/sysproto.h> 43 #include <sys/kernel.h> 44 #include <sys/sysctl.h> 45 #include <sys/file.h> 46 #include <sys/filedesc.h> 47 #include <sys/vnode.h> 48 #include <sys/malloc.h> 49 #include <sys/mount.h> 50 #include <sys/priv.h> 51 #include <sys/proc.h> 52 #include <sys/bio.h> 53 #include <sys/buf.h> 54 #include <sys/mbuf.h> 55 #include <sys/socket.h> 56 #include <sys/socketvar.h> 57 #include <sys/domain.h> 58 #include <sys/protosw.h> 59 #include <sys/namei.h> 60 #include <sys/fcntl.h> 61 #include <sys/lockf.h> 62 63 #include <netinet/in.h> 64 #include <netinet/tcp.h> 65 #ifdef INET6 66 #include <net/if.h> 67 #include <netinet6/in6_var.h> 68 #endif 69 #include <nfs/xdr_subs.h> 70 #include <nfs/rpcv2.h> 71 #include <nfs/nfsproto.h> 72 #include <nfsserver/nfs.h> 73 #include <nfsserver/nfsm_subs.h> 74 #include <nfsserver/nfsrvcache.h> 75 76 static MALLOC_DEFINE(M_NFSSVC, "nfss_srvsock", "Nfs server structure"); 77 78 MALLOC_DEFINE(M_NFSRVDESC, "nfss_srvdesc", "NFS server socket descriptor"); 79 MALLOC_DEFINE(M_NFSD, "nfss_daemon", "Nfs server daemon structure"); 80 81 #define TRUE 1 82 #define FALSE 0 83 84 SYSCTL_DECL(_vfs_nfsrv); 85 86 int nfsd_waiting = 0; 87 int nfsrv_numnfsd = 0; 88 static int notstarted = 1; 89 90 static int nfs_privport = 0; 91 SYSCTL_INT(_vfs_nfsrv, NFS_NFSPRIVPORT, nfs_privport, CTLFLAG_RW, 92 &nfs_privport, 0, ""); 93 SYSCTL_INT(_vfs_nfsrv, OID_AUTO, gatherdelay, CTLFLAG_RW, 94 &nfsrvw_procrastinate, 0, ""); 95 SYSCTL_INT(_vfs_nfsrv, OID_AUTO, gatherdelay_v3, CTLFLAG_RW, 96 &nfsrvw_procrastinate_v3, 0, ""); 97 98 static int nfssvc_addsock(struct file *, struct sockaddr *, 99 struct thread *); 100 static void nfsrv_zapsock(struct nfssvc_sock *slp); 101 static int nfssvc_nfsd(struct thread *); 102 103 extern u_long sb_max_adj; 104 105 /* 106 * NFS server system calls 107 */ 108 109 /* 110 * Nfs server psuedo system call for the nfsd's 111 * Based on the flag value it either: 112 * - adds a socket to the selection list 113 * - remains in the kernel as an nfsd 114 * - remains in the kernel as an nfsiod 115 * For INET6 we suppose that nfsd provides only IN6P_IPV6_V6ONLY sockets 116 * and that mountd provides 117 * - sockaddr with no IPv4-mapped addresses 118 * - mask for both INET and INET6 families if there is IPv4-mapped overlap 119 */ 120 #ifndef _SYS_SYSPROTO_H_ 121 struct nfssvc_args { 122 int flag; 123 caddr_t argp; 124 }; 125 #endif 126 int 127 nfssvc(struct thread *td, struct nfssvc_args *uap) 128 { 129 struct file *fp; 130 struct sockaddr *nam; 131 struct nfsd_args nfsdarg; 132 int error; 133 134 KASSERT(!mtx_owned(&Giant), ("nfssvc(): called with Giant")); 135 136 error = priv_check(td, PRIV_NFS_DAEMON); 137 if (error) 138 return (error); 139 NFSD_LOCK(); 140 while (nfssvc_sockhead_flag & SLP_INIT) { 141 nfssvc_sockhead_flag |= SLP_WANTINIT; 142 (void) msleep(&nfssvc_sockhead, &nfsd_mtx, PSOCK, 143 "nfsd init", 0); 144 } 145 NFSD_UNLOCK(); 146 if (uap->flag & NFSSVC_ADDSOCK) { 147 error = copyin(uap->argp, (caddr_t)&nfsdarg, sizeof(nfsdarg)); 148 if (error) 149 return (error); 150 if ((error = fget(td, nfsdarg.sock, &fp)) != 0) 151 return (error); 152 if (fp->f_type != DTYPE_SOCKET) { 153 fdrop(fp, td); 154 return (error); /* XXXRW: Should be EINVAL? */ 155 } 156 /* 157 * Get the client address for connected sockets. 158 */ 159 if (nfsdarg.name == NULL || nfsdarg.namelen == 0) 160 nam = NULL; 161 else { 162 error = getsockaddr(&nam, nfsdarg.name, 163 nfsdarg.namelen); 164 if (error) { 165 fdrop(fp, td); 166 return (error); 167 } 168 } 169 error = nfssvc_addsock(fp, nam, td); 170 fdrop(fp, td); 171 } else if (uap->flag & NFSSVC_NFSD) { 172 error = nfssvc_nfsd(td); 173 } else { 174 error = ENXIO; 175 } 176 if (error == EINTR || error == ERESTART) 177 error = 0; 178 return (error); 179 } 180 181 /* 182 * Adds a socket to the list for servicing by nfsds. 183 */ 184 static int 185 nfssvc_addsock(struct file *fp, struct sockaddr *mynam, struct thread *td) 186 { 187 int siz; 188 struct nfssvc_sock *slp; 189 struct socket *so; 190 int error, s; 191 192 so = fp->f_data; 193 #if 0 194 /* 195 * XXXRW: If this code is ever enabled, there's a race when running 196 * MPSAFE. 197 */ 198 tslp = NULL; 199 /* 200 * Add it to the list, as required. 201 */ 202 if (so->so_proto->pr_protocol == IPPROTO_UDP) { 203 tslp = nfs_udpsock; 204 if (tslp->ns_flag & SLP_VALID) { 205 if (mynam != NULL) 206 FREE(mynam, M_SONAME); 207 return (EPERM); 208 } 209 } 210 #endif 211 siz = sb_max_adj; 212 error = soreserve(so, siz, siz); 213 if (error) { 214 if (mynam != NULL) 215 FREE(mynam, M_SONAME); 216 return (error); 217 } 218 219 /* 220 * Set protocol specific options { for now TCP only } and 221 * reserve some space. For datagram sockets, this can get called 222 * repeatedly for the same socket, but that isn't harmful. 223 */ 224 if (so->so_type == SOCK_STREAM) { 225 struct sockopt sopt; 226 int val; 227 228 bzero(&sopt, sizeof sopt); 229 sopt.sopt_dir = SOPT_SET; 230 sopt.sopt_level = SOL_SOCKET; 231 sopt.sopt_name = SO_KEEPALIVE; 232 sopt.sopt_val = &val; 233 sopt.sopt_valsize = sizeof val; 234 val = 1; 235 sosetopt(so, &sopt); 236 } 237 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 238 struct sockopt sopt; 239 int val; 240 241 bzero(&sopt, sizeof sopt); 242 sopt.sopt_dir = SOPT_SET; 243 sopt.sopt_level = IPPROTO_TCP; 244 sopt.sopt_name = TCP_NODELAY; 245 sopt.sopt_val = &val; 246 sopt.sopt_valsize = sizeof val; 247 val = 1; 248 sosetopt(so, &sopt); 249 } 250 SOCKBUF_LOCK(&so->so_rcv); 251 so->so_rcv.sb_flags &= ~SB_NOINTR; 252 so->so_rcv.sb_timeo = 0; 253 SOCKBUF_UNLOCK(&so->so_rcv); 254 SOCKBUF_LOCK(&so->so_snd); 255 so->so_snd.sb_flags &= ~SB_NOINTR; 256 so->so_snd.sb_timeo = 0; 257 SOCKBUF_UNLOCK(&so->so_snd); 258 259 slp = (struct nfssvc_sock *) 260 malloc(sizeof (struct nfssvc_sock), M_NFSSVC, 261 M_WAITOK | M_ZERO); 262 STAILQ_INIT(&slp->ns_rec); 263 NFSD_LOCK(); 264 TAILQ_INSERT_TAIL(&nfssvc_sockhead, slp, ns_chain); 265 266 slp->ns_so = so; 267 slp->ns_nam = mynam; 268 fhold(fp); 269 slp->ns_fp = fp; 270 /* 271 * XXXRW: Socket locking here? 272 */ 273 s = splnet(); 274 so->so_upcallarg = (caddr_t)slp; 275 so->so_upcall = nfsrv_rcv; 276 SOCKBUF_LOCK(&so->so_rcv); 277 so->so_rcv.sb_flags |= SB_UPCALL; 278 SOCKBUF_UNLOCK(&so->so_rcv); 279 slp->ns_flag = (SLP_VALID | SLP_NEEDQ); 280 nfsrv_wakenfsd(slp); 281 splx(s); 282 NFSD_UNLOCK(); 283 return (0); 284 } 285 286 /* 287 * Called by nfssvc() for nfsds. Just loops around servicing rpc requests 288 * until it is killed by a signal. 289 */ 290 static int 291 nfssvc_nfsd(struct thread *td) 292 { 293 int siz; 294 struct nfssvc_sock *slp; 295 struct nfsd *nfsd; 296 struct nfsrv_descript *nd = NULL; 297 struct mbuf *m, *mreq; 298 int error = 0, cacherep, s, sotype, writes_todo; 299 int procrastinate; 300 u_quad_t cur_usec; 301 302 #ifndef nolint 303 cacherep = RC_DOIT; 304 writes_todo = 0; 305 #endif 306 nfsd = (struct nfsd *) 307 malloc(sizeof (struct nfsd), M_NFSD, M_WAITOK | M_ZERO); 308 s = splnet(); 309 NFSD_LOCK(); 310 311 nfsd->nfsd_td = td; 312 TAILQ_INSERT_TAIL(&nfsd_head, nfsd, nfsd_chain); 313 nfsrv_numnfsd++; 314 315 /* 316 * Loop getting rpc requests until SIGKILL. 317 */ 318 for (;;) { 319 if ((nfsd->nfsd_flag & NFSD_REQINPROG) == 0) { 320 while (nfsd->nfsd_slp == NULL && 321 (nfsd_head_flag & NFSD_CHECKSLP) == 0) { 322 nfsd->nfsd_flag |= NFSD_WAITING; 323 nfsd_waiting++; 324 error = msleep(nfsd, &nfsd_mtx, 325 PSOCK | PCATCH, "-", 0); 326 nfsd_waiting--; 327 if (error) 328 goto done; 329 } 330 if (nfsd->nfsd_slp == NULL && 331 (nfsd_head_flag & NFSD_CHECKSLP) != 0) { 332 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) { 333 if ((slp->ns_flag & (SLP_VALID | SLP_DOREC)) 334 == (SLP_VALID | SLP_DOREC)) { 335 slp->ns_flag &= ~SLP_DOREC; 336 slp->ns_sref++; 337 nfsd->nfsd_slp = slp; 338 break; 339 } 340 } 341 if (slp == NULL) 342 nfsd_head_flag &= ~NFSD_CHECKSLP; 343 } 344 if ((slp = nfsd->nfsd_slp) == NULL) 345 continue; 346 if (slp->ns_flag & SLP_VALID) { 347 if (slp->ns_flag & SLP_DISCONN) 348 nfsrv_zapsock(slp); 349 else if (slp->ns_flag & SLP_NEEDQ) { 350 slp->ns_flag &= ~SLP_NEEDQ; 351 (void) nfs_slplock(slp, 1); 352 NFSD_UNLOCK(); 353 nfsrv_rcv(slp->ns_so, (caddr_t)slp, 354 M_TRYWAIT); 355 NFSD_LOCK(); 356 nfs_slpunlock(slp); 357 } 358 error = nfsrv_dorec(slp, nfsd, &nd); 359 cur_usec = nfs_curusec(); 360 if (error && LIST_FIRST(&slp->ns_tq) && 361 LIST_FIRST(&slp->ns_tq)->nd_time <= cur_usec) { 362 error = 0; 363 cacherep = RC_DOIT; 364 writes_todo = 1; 365 } else 366 writes_todo = 0; 367 nfsd->nfsd_flag |= NFSD_REQINPROG; 368 } 369 } else { 370 error = 0; 371 slp = nfsd->nfsd_slp; 372 } 373 if (error || (slp->ns_flag & SLP_VALID) == 0) { 374 if (nd) { 375 if (nd->nd_cr != NULL) 376 crfree(nd->nd_cr); 377 free((caddr_t)nd, M_NFSRVDESC); 378 nd = NULL; 379 } 380 nfsd->nfsd_slp = NULL; 381 nfsd->nfsd_flag &= ~NFSD_REQINPROG; 382 nfsrv_slpderef(slp); 383 continue; 384 } 385 splx(s); 386 sotype = slp->ns_so->so_type; 387 if (nd) { 388 getmicrotime(&nd->nd_starttime); 389 if (nd->nd_nam2) 390 nd->nd_nam = nd->nd_nam2; 391 else 392 nd->nd_nam = slp->ns_nam; 393 394 /* 395 * Check to see if authorization is needed. 396 */ 397 cacherep = nfsrv_getcache(nd, &mreq); 398 399 if (nfs_privport) { 400 /* Check if source port is privileged */ 401 u_short port; 402 struct sockaddr *nam = nd->nd_nam; 403 struct sockaddr_in *sin; 404 405 sin = (struct sockaddr_in *)nam; 406 /* 407 * INET/INET6 - same code: 408 * sin_port and sin6_port are at same offset 409 */ 410 port = ntohs(sin->sin_port); 411 if (port >= IPPORT_RESERVED && 412 nd->nd_procnum != NFSPROC_NULL) { 413 #ifdef INET6 414 char b6[INET6_ADDRSTRLEN]; 415 #if defined(KLD_MODULE) 416 /* Do not use ip6_sprintf: the nfs module should work without INET6. */ 417 #define ip6_sprintf(buf, a) \ 418 (sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x", \ 419 (a)->s6_addr16[0], (a)->s6_addr16[1], \ 420 (a)->s6_addr16[2], (a)->s6_addr16[3], \ 421 (a)->s6_addr16[4], (a)->s6_addr16[5], \ 422 (a)->s6_addr16[6], (a)->s6_addr16[7]), \ 423 (buf)) 424 #endif 425 #endif 426 nd->nd_procnum = NFSPROC_NOOP; 427 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK); 428 cacherep = RC_DOIT; 429 printf("NFS request from unprivileged port (%s:%d)\n", 430 #ifdef INET6 431 sin->sin_family == AF_INET6 ? 432 ip6_sprintf(b6, &satosin6(sin)->sin6_addr) : 433 #if defined(KLD_MODULE) 434 #undef ip6_sprintf 435 #endif 436 #endif 437 inet_ntoa(sin->sin_addr), port); 438 } 439 } 440 441 } 442 443 /* 444 * Loop to get all the write rpc relies that have been 445 * gathered together. 446 */ 447 do { 448 switch (cacherep) { 449 case RC_DOIT: 450 if (nd && (nd->nd_flag & ND_NFSV3)) 451 procrastinate = nfsrvw_procrastinate_v3; 452 else 453 procrastinate = nfsrvw_procrastinate; 454 NFSD_UNLOCK(); 455 if (writes_todo || (!(nd->nd_flag & ND_NFSV3) && 456 nd->nd_procnum == NFSPROC_WRITE && 457 procrastinate > 0 && !notstarted)) 458 error = nfsrv_writegather(&nd, slp, 459 nfsd->nfsd_td, &mreq); 460 else 461 error = (*(nfsrv3_procs[nd->nd_procnum]))(nd, 462 slp, nfsd->nfsd_td, &mreq); 463 NFSD_LOCK(); 464 if (mreq == NULL) 465 break; 466 if (error != 0 && error != NFSERR_RETVOID) { 467 nfsrvstats.srv_errs++; 468 nfsrv_updatecache(nd, FALSE, mreq); 469 if (nd->nd_nam2) 470 FREE(nd->nd_nam2, M_SONAME); 471 break; 472 } 473 nfsrvstats.srvrpccnt[nd->nd_procnum]++; 474 nfsrv_updatecache(nd, TRUE, mreq); 475 nd->nd_mrep = NULL; 476 /* FALLTHROUGH */ 477 case RC_REPLY: 478 NFSD_UNLOCK(); 479 siz = m_length(mreq, NULL); 480 if (siz <= 0 || siz > NFS_MAXPACKET) { 481 printf("mbuf siz=%d\n",siz); 482 panic("Bad nfs svc reply"); 483 } 484 m = mreq; 485 m->m_pkthdr.len = siz; 486 m->m_pkthdr.rcvif = NULL; 487 /* 488 * For stream protocols, prepend a Sun RPC 489 * Record Mark. 490 */ 491 if (sotype == SOCK_STREAM) { 492 M_PREPEND(m, NFSX_UNSIGNED, M_TRYWAIT); 493 *mtod(m, u_int32_t *) = htonl(0x80000000 | siz); 494 } 495 NFSD_LOCK(); 496 if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED) 497 (void) nfs_slplock(slp, 1); 498 if (slp->ns_flag & SLP_VALID) { 499 NFSD_UNLOCK(); 500 error = nfsrv_send(slp->ns_so, nd->nd_nam2, m); 501 NFSD_LOCK(); 502 } else { 503 error = EPIPE; 504 m_freem(m); 505 } 506 if (nd->nd_nam2) 507 FREE(nd->nd_nam2, M_SONAME); 508 if (nd->nd_mrep) 509 m_freem(nd->nd_mrep); 510 if (error == EPIPE) 511 nfsrv_zapsock(slp); 512 if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED) 513 nfs_slpunlock(slp); 514 if (error == EINTR || error == ERESTART) { 515 if (nd->nd_cr != NULL) 516 crfree(nd->nd_cr); 517 free((caddr_t)nd, M_NFSRVDESC); 518 nfsrv_slpderef(slp); 519 s = splnet(); 520 goto done; 521 } 522 break; 523 case RC_DROPIT: 524 m_freem(nd->nd_mrep); 525 if (nd->nd_nam2) 526 FREE(nd->nd_nam2, M_SONAME); 527 break; 528 }; 529 if (nd) { 530 if (nd->nd_cr != NULL) 531 crfree(nd->nd_cr); 532 FREE((caddr_t)nd, M_NFSRVDESC); 533 nd = NULL; 534 } 535 536 /* 537 * Check to see if there are outstanding writes that 538 * need to be serviced. 539 */ 540 cur_usec = nfs_curusec(); 541 s = splsoftclock(); 542 if (LIST_FIRST(&slp->ns_tq) && 543 LIST_FIRST(&slp->ns_tq)->nd_time <= cur_usec) { 544 cacherep = RC_DOIT; 545 writes_todo = 1; 546 } else 547 writes_todo = 0; 548 splx(s); 549 } while (writes_todo); 550 s = splnet(); 551 if (nfsrv_dorec(slp, nfsd, &nd)) { 552 nfsd->nfsd_flag &= ~NFSD_REQINPROG; 553 nfsd->nfsd_slp = NULL; 554 nfsrv_slpderef(slp); 555 } 556 mtx_assert(&Giant, MA_NOTOWNED); 557 } 558 done: 559 mtx_assert(&Giant, MA_NOTOWNED); 560 TAILQ_REMOVE(&nfsd_head, nfsd, nfsd_chain); 561 splx(s); 562 free((caddr_t)nfsd, M_NFSD); 563 if (--nfsrv_numnfsd == 0) 564 nfsrv_init(TRUE); /* Reinitialize everything */ 565 NFSD_UNLOCK(); 566 return (error); 567 } 568 569 /* 570 * Shut down a socket associated with an nfssvc_sock structure. 571 * Should be called with the send lock set, if required. 572 * The trick here is to increment the sref at the start, so that the nfsds 573 * will stop using it and clear ns_flag at the end so that it will not be 574 * reassigned during cleanup. 575 */ 576 static void 577 nfsrv_zapsock(struct nfssvc_sock *slp) 578 { 579 struct nfsrv_descript *nwp, *nnwp; 580 struct socket *so; 581 struct file *fp; 582 struct nfsrv_rec *rec; 583 int s; 584 585 NFSD_LOCK_ASSERT(); 586 587 /* 588 * XXXRW: By clearing all flags, other threads/etc should ignore 589 * this slp and we can safely release nfsd_mtx so we can clean 590 * up the slp safely. 591 */ 592 slp->ns_flag &= ~SLP_ALLFLAGS; 593 fp = slp->ns_fp; 594 if (fp) { 595 NFSD_UNLOCK(); 596 slp->ns_fp = NULL; 597 so = slp->ns_so; 598 SOCKBUF_LOCK(&so->so_rcv); 599 so->so_rcv.sb_flags &= ~SB_UPCALL; 600 SOCKBUF_UNLOCK(&so->so_rcv); 601 so->so_upcall = NULL; 602 so->so_upcallarg = NULL; 603 soshutdown(so, SHUT_RDWR); 604 closef(fp, NULL); 605 NFSD_LOCK(); 606 if (slp->ns_nam) 607 FREE(slp->ns_nam, M_SONAME); 608 m_freem(slp->ns_raw); 609 while ((rec = STAILQ_FIRST(&slp->ns_rec)) != NULL) { 610 STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link); 611 if (rec->nr_address) 612 FREE(rec->nr_address, M_SONAME); 613 m_freem(rec->nr_packet); 614 free(rec, M_NFSRVDESC); 615 } 616 s = splsoftclock(); 617 for (nwp = LIST_FIRST(&slp->ns_tq); nwp; nwp = nnwp) { 618 nnwp = LIST_NEXT(nwp, nd_tq); 619 LIST_REMOVE(nwp, nd_tq); 620 if (nwp->nd_cr != NULL) 621 crfree(nwp->nd_cr); 622 free((caddr_t)nwp, M_NFSRVDESC); 623 } 624 LIST_INIT(&slp->ns_tq); 625 splx(s); 626 } 627 } 628 629 /* 630 * Derefence a server socket structure. If it has no more references and 631 * is no longer valid, you can throw it away. 632 */ 633 void 634 nfsrv_slpderef(struct nfssvc_sock *slp) 635 { 636 637 NFSD_LOCK_ASSERT(); 638 639 if (--(slp->ns_sref) == 0 && (slp->ns_flag & SLP_VALID) == 0) { 640 TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain); 641 free((caddr_t)slp, M_NFSSVC); 642 } 643 } 644 645 /* 646 * Lock a socket against others. 647 * 648 * XXXRW: Wait argument is always 1 in the caller. Replace with a real 649 * sleep lock? 650 */ 651 int 652 nfs_slplock(struct nfssvc_sock *slp, int wait) 653 { 654 int *statep = &slp->ns_solock; 655 656 NFSD_LOCK_ASSERT(); 657 658 if (!wait && (*statep & NFSRV_SNDLOCK)) 659 return(0); /* already locked, fail */ 660 while (*statep & NFSRV_SNDLOCK) { 661 *statep |= NFSRV_WANTSND; 662 (void) msleep(statep, &nfsd_mtx, PZERO - 1, "nfsslplck", 0); 663 } 664 *statep |= NFSRV_SNDLOCK; 665 return (1); 666 } 667 668 /* 669 * Unlock the stream socket for others. 670 */ 671 void 672 nfs_slpunlock(struct nfssvc_sock *slp) 673 { 674 int *statep = &slp->ns_solock; 675 676 NFSD_LOCK_ASSERT(); 677 678 if ((*statep & NFSRV_SNDLOCK) == 0) 679 panic("nfs slpunlock"); 680 *statep &= ~NFSRV_SNDLOCK; 681 if (*statep & NFSRV_WANTSND) { 682 *statep &= ~NFSRV_WANTSND; 683 wakeup(statep); 684 } 685 } 686 687 /* 688 * Initialize the data structures for the server. 689 * Handshake with any new nfsds starting up to avoid any chance of 690 * corruption. 691 */ 692 void 693 nfsrv_init(int terminating) 694 { 695 struct nfssvc_sock *slp, *nslp; 696 697 NFSD_LOCK_ASSERT(); 698 699 if (nfssvc_sockhead_flag & SLP_INIT) 700 panic("nfsd init"); 701 nfssvc_sockhead_flag |= SLP_INIT; 702 if (terminating) { 703 TAILQ_FOREACH_SAFE(slp, &nfssvc_sockhead, ns_chain, nslp) { 704 if (slp->ns_flag & SLP_VALID) 705 nfsrv_zapsock(slp); 706 TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain); 707 free((caddr_t)slp, M_NFSSVC); 708 } 709 nfsrv_cleancache(); /* And clear out server cache */ 710 } else 711 nfs_pub.np_valid = 0; 712 713 TAILQ_INIT(&nfssvc_sockhead); 714 nfssvc_sockhead_flag &= ~SLP_INIT; 715 if (nfssvc_sockhead_flag & SLP_WANTINIT) { 716 nfssvc_sockhead_flag &= ~SLP_WANTINIT; 717 wakeup(&nfssvc_sockhead); 718 } 719 720 TAILQ_INIT(&nfsd_head); 721 nfsd_head_flag &= ~NFSD_CHECKSLP; 722 723 #if 0 724 nfs_udpsock = (struct nfssvc_sock *) 725 malloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO); 726 STAILQ_INIT(&nfs_udpsock->ns_rec); 727 TAILQ_INSERT_HEAD(&nfssvc_sockhead, nfs_udpsock, ns_chain); 728 729 nfs_cltpsock = (struct nfssvc_sock *) 730 malloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO); 731 STAILQ_INIT(&nfs_cltpsock->ns_rec); 732 TAILQ_INSERT_TAIL(&nfssvc_sockhead, nfs_cltpsock, ns_chain); 733 #endif 734 }
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