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; 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 SOCKBUF_LOCK(&so->so_rcv); 271 so->so_upcallarg = (caddr_t)slp; 272 so->so_upcall = nfsrv_rcv; 273 so->so_rcv.sb_flags |= SB_UPCALL; 274 SOCKBUF_UNLOCK(&so->so_rcv); 275 slp->ns_flag = (SLP_VALID | SLP_NEEDQ); 276 nfsrv_wakenfsd(slp); 277 NFSD_UNLOCK(); 278 return (0); 279 } 280 281 /* 282 * Called by nfssvc() for nfsds. Just loops around servicing rpc requests 283 * until it is killed by a signal. 284 */ 285 static int 286 nfssvc_nfsd(struct thread *td) 287 { 288 int siz; 289 struct nfssvc_sock *slp; 290 struct nfsd *nfsd; 291 struct nfsrv_descript *nd = NULL; 292 struct mbuf *m, *mreq; 293 int error = 0, cacherep, s, sotype, writes_todo; 294 int procrastinate; 295 u_quad_t cur_usec; 296 297 #ifndef nolint 298 cacherep = RC_DOIT; 299 writes_todo = 0; 300 #endif 301 nfsd = (struct nfsd *) 302 malloc(sizeof (struct nfsd), M_NFSD, M_WAITOK | M_ZERO); 303 s = splnet(); 304 NFSD_LOCK(); 305 306 nfsd->nfsd_td = td; 307 TAILQ_INSERT_TAIL(&nfsd_head, nfsd, nfsd_chain); 308 nfsrv_numnfsd++; 309 310 /* 311 * Loop getting rpc requests until SIGKILL. 312 */ 313 for (;;) { 314 if ((nfsd->nfsd_flag & NFSD_REQINPROG) == 0) { 315 while (nfsd->nfsd_slp == NULL && 316 (nfsd_head_flag & NFSD_CHECKSLP) == 0) { 317 nfsd->nfsd_flag |= NFSD_WAITING; 318 nfsd_waiting++; 319 error = msleep(nfsd, &nfsd_mtx, 320 PSOCK | PCATCH, "-", 0); 321 nfsd_waiting--; 322 if (error) 323 goto done; 324 } 325 if (nfsd->nfsd_slp == NULL && 326 (nfsd_head_flag & NFSD_CHECKSLP) != 0) { 327 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) { 328 if ((slp->ns_flag & (SLP_VALID | SLP_DOREC)) 329 == (SLP_VALID | SLP_DOREC)) { 330 slp->ns_flag &= ~SLP_DOREC; 331 slp->ns_sref++; 332 nfsd->nfsd_slp = slp; 333 break; 334 } 335 } 336 if (slp == NULL) 337 nfsd_head_flag &= ~NFSD_CHECKSLP; 338 } 339 if ((slp = nfsd->nfsd_slp) == NULL) 340 continue; 341 if (slp->ns_flag & SLP_VALID) { 342 if (slp->ns_flag & SLP_DISCONN) 343 nfsrv_zapsock(slp); 344 else if (slp->ns_flag & SLP_NEEDQ) { 345 slp->ns_flag &= ~SLP_NEEDQ; 346 (void) nfs_slplock(slp, 1); 347 NFSD_UNLOCK(); 348 nfsrv_rcv(slp->ns_so, (caddr_t)slp, 349 M_TRYWAIT); 350 NFSD_LOCK(); 351 nfs_slpunlock(slp); 352 } 353 error = nfsrv_dorec(slp, nfsd, &nd); 354 cur_usec = nfs_curusec(); 355 if (error && LIST_FIRST(&slp->ns_tq) && 356 LIST_FIRST(&slp->ns_tq)->nd_time <= cur_usec) { 357 error = 0; 358 cacherep = RC_DOIT; 359 writes_todo = 1; 360 } else 361 writes_todo = 0; 362 nfsd->nfsd_flag |= NFSD_REQINPROG; 363 } 364 } else { 365 error = 0; 366 slp = nfsd->nfsd_slp; 367 } 368 if (error || (slp->ns_flag & SLP_VALID) == 0) { 369 if (slp->ns_flag & SLP_DISCONN) 370 nfsrv_zapsock(slp); 371 if (nd) { 372 if (nd->nd_cr != NULL) 373 crfree(nd->nd_cr); 374 free((caddr_t)nd, M_NFSRVDESC); 375 nd = NULL; 376 } 377 nfsd->nfsd_slp = NULL; 378 nfsd->nfsd_flag &= ~NFSD_REQINPROG; 379 nfsrv_slpderef(slp); 380 continue; 381 } 382 splx(s); 383 sotype = slp->ns_so->so_type; 384 if (nd) { 385 getmicrotime(&nd->nd_starttime); 386 if (nd->nd_nam2) 387 nd->nd_nam = nd->nd_nam2; 388 else 389 nd->nd_nam = slp->ns_nam; 390 391 /* 392 * Check to see if authorization is needed. 393 */ 394 cacherep = nfsrv_getcache(nd, &mreq); 395 396 if (nfs_privport) { 397 /* Check if source port is privileged */ 398 u_short port; 399 struct sockaddr *nam = nd->nd_nam; 400 struct sockaddr_in *sin; 401 402 sin = (struct sockaddr_in *)nam; 403 /* 404 * INET/INET6 - same code: 405 * sin_port and sin6_port are at same offset 406 */ 407 port = ntohs(sin->sin_port); 408 if (port >= IPPORT_RESERVED && 409 nd->nd_procnum != NFSPROC_NULL) { 410 #ifdef INET6 411 char b6[INET6_ADDRSTRLEN]; 412 #if defined(KLD_MODULE) 413 /* Do not use ip6_sprintf: the nfs module should work without INET6. */ 414 #define ip6_sprintf(buf, a) \ 415 (sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x", \ 416 (a)->s6_addr16[0], (a)->s6_addr16[1], \ 417 (a)->s6_addr16[2], (a)->s6_addr16[3], \ 418 (a)->s6_addr16[4], (a)->s6_addr16[5], \ 419 (a)->s6_addr16[6], (a)->s6_addr16[7]), \ 420 (buf)) 421 #endif 422 #endif 423 nd->nd_procnum = NFSPROC_NOOP; 424 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK); 425 cacherep = RC_DOIT; 426 printf("NFS request from unprivileged port (%s:%d)\n", 427 #ifdef INET6 428 sin->sin_family == AF_INET6 ? 429 ip6_sprintf(b6, &satosin6(sin)->sin6_addr) : 430 #if defined(KLD_MODULE) 431 #undef ip6_sprintf 432 #endif 433 #endif 434 inet_ntoa(sin->sin_addr), port); 435 } 436 } 437 438 } 439 440 /* 441 * Loop to get all the write rpc relies that have been 442 * gathered together. 443 */ 444 do { 445 switch (cacherep) { 446 case RC_DOIT: 447 if (nd && (nd->nd_flag & ND_NFSV3)) 448 procrastinate = nfsrvw_procrastinate_v3; 449 else 450 procrastinate = nfsrvw_procrastinate; 451 NFSD_UNLOCK(); 452 if (writes_todo || (!(nd->nd_flag & ND_NFSV3) && 453 nd->nd_procnum == NFSPROC_WRITE && 454 procrastinate > 0 && !notstarted)) 455 error = nfsrv_writegather(&nd, slp, 456 nfsd->nfsd_td, &mreq); 457 else 458 error = (*(nfsrv3_procs[nd->nd_procnum]))(nd, 459 slp, nfsd->nfsd_td, &mreq); 460 NFSD_LOCK(); 461 if (mreq == NULL) 462 break; 463 if (error != 0 && error != NFSERR_RETVOID) { 464 nfsrvstats.srv_errs++; 465 nfsrv_updatecache(nd, FALSE, mreq); 466 if (nd->nd_nam2) 467 FREE(nd->nd_nam2, M_SONAME); 468 break; 469 } 470 nfsrvstats.srvrpccnt[nd->nd_procnum]++; 471 nfsrv_updatecache(nd, TRUE, mreq); 472 nd->nd_mrep = NULL; 473 /* FALLTHROUGH */ 474 case RC_REPLY: 475 NFSD_UNLOCK(); 476 siz = m_length(mreq, NULL); 477 if (siz <= 0 || siz > NFS_MAXPACKET) { 478 printf("mbuf siz=%d\n",siz); 479 panic("Bad nfs svc reply"); 480 } 481 m = mreq; 482 m->m_pkthdr.len = siz; 483 m->m_pkthdr.rcvif = NULL; 484 /* 485 * For stream protocols, prepend a Sun RPC 486 * Record Mark. 487 */ 488 if (sotype == SOCK_STREAM) { 489 M_PREPEND(m, NFSX_UNSIGNED, M_TRYWAIT); 490 *mtod(m, u_int32_t *) = htonl(0x80000000 | siz); 491 } 492 NFSD_LOCK(); 493 if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED) 494 (void) nfs_slplock(slp, 1); 495 if (slp->ns_flag & SLP_VALID) { 496 NFSD_UNLOCK(); 497 error = nfsrv_send(slp->ns_so, nd->nd_nam2, m); 498 NFSD_LOCK(); 499 } else { 500 error = EPIPE; 501 m_freem(m); 502 } 503 if (nd->nd_nam2) 504 FREE(nd->nd_nam2, M_SONAME); 505 if (nd->nd_mrep) 506 m_freem(nd->nd_mrep); 507 if (error == EPIPE) 508 nfsrv_zapsock(slp); 509 if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED) 510 nfs_slpunlock(slp); 511 if (error == EINTR || error == ERESTART) { 512 if (nd->nd_cr != NULL) 513 crfree(nd->nd_cr); 514 free((caddr_t)nd, M_NFSRVDESC); 515 nfsrv_slpderef(slp); 516 s = splnet(); 517 goto done; 518 } 519 break; 520 case RC_DROPIT: 521 m_freem(nd->nd_mrep); 522 if (nd->nd_nam2) 523 FREE(nd->nd_nam2, M_SONAME); 524 break; 525 }; 526 if (nd) { 527 if (nd->nd_cr != NULL) 528 crfree(nd->nd_cr); 529 FREE((caddr_t)nd, M_NFSRVDESC); 530 nd = NULL; 531 } 532 533 /* 534 * Check to see if there are outstanding writes that 535 * need to be serviced. 536 */ 537 cur_usec = nfs_curusec(); 538 s = splsoftclock(); 539 if (LIST_FIRST(&slp->ns_tq) && 540 LIST_FIRST(&slp->ns_tq)->nd_time <= cur_usec) { 541 cacherep = RC_DOIT; 542 writes_todo = 1; 543 } else 544 writes_todo = 0; 545 splx(s); 546 } while (writes_todo); 547 s = splnet(); 548 if (nfsrv_dorec(slp, nfsd, &nd)) { 549 nfsd->nfsd_flag &= ~NFSD_REQINPROG; 550 nfsd->nfsd_slp = NULL; 551 nfsrv_slpderef(slp); 552 } 553 mtx_assert(&Giant, MA_NOTOWNED); 554 } 555 done: 556 mtx_assert(&Giant, MA_NOTOWNED); 557 TAILQ_REMOVE(&nfsd_head, nfsd, nfsd_chain); 558 splx(s); 559 free((caddr_t)nfsd, M_NFSD); 560 if (--nfsrv_numnfsd == 0) 561 nfsrv_init(TRUE); /* Reinitialize everything */ 562 NFSD_UNLOCK(); 563 return (error); 564 } 565 566 /* 567 * Shut down a socket associated with an nfssvc_sock structure. 568 * Should be called with the send lock set, if required. 569 * The trick here is to increment the sref at the start, so that the nfsds 570 * will stop using it and clear ns_flag at the end so that it will not be 571 * reassigned during cleanup. 572 */ 573 static void 574 nfsrv_zapsock(struct nfssvc_sock *slp) 575 { 576 struct nfsrv_descript *nwp, *nnwp; 577 struct socket *so; 578 struct file *fp; 579 struct nfsrv_rec *rec; 580 int s; 581 582 NFSD_LOCK_ASSERT(); 583 584 /* 585 * XXXRW: By clearing all flags, other threads/etc should ignore 586 * this slp and we can safely release nfsd_mtx so we can clean 587 * up the slp safely. 588 */ 589 slp->ns_flag &= ~SLP_ALLFLAGS; 590 fp = slp->ns_fp; 591 if (fp) { 592 NFSD_UNLOCK(); 593 slp->ns_fp = NULL; 594 so = slp->ns_so; 595 SOCKBUF_LOCK(&so->so_rcv); 596 so->so_rcv.sb_flags &= ~SB_UPCALL; 597 so->so_upcall = NULL; 598 so->so_upcallarg = NULL; 599 SOCKBUF_UNLOCK(&so->so_rcv); 600 soshutdown(so, SHUT_RDWR); 601 closef(fp, NULL); 602 NFSD_LOCK(); 603 if (slp->ns_nam) 604 FREE(slp->ns_nam, M_SONAME); 605 m_freem(slp->ns_raw); 606 while ((rec = STAILQ_FIRST(&slp->ns_rec)) != NULL) { 607 STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link); 608 if (rec->nr_address) 609 FREE(rec->nr_address, M_SONAME); 610 m_freem(rec->nr_packet); 611 free(rec, M_NFSRVDESC); 612 } 613 s = splsoftclock(); 614 for (nwp = LIST_FIRST(&slp->ns_tq); nwp; nwp = nnwp) { 615 nnwp = LIST_NEXT(nwp, nd_tq); 616 LIST_REMOVE(nwp, nd_tq); 617 if (nwp->nd_cr != NULL) 618 crfree(nwp->nd_cr); 619 free((caddr_t)nwp, M_NFSRVDESC); 620 } 621 LIST_INIT(&slp->ns_tq); 622 splx(s); 623 } 624 } 625 626 /* 627 * Derefence a server socket structure. If it has no more references and 628 * is no longer valid, you can throw it away. 629 */ 630 void 631 nfsrv_slpderef(struct nfssvc_sock *slp) 632 { 633 634 NFSD_LOCK_ASSERT(); 635 636 if (--(slp->ns_sref) == 0 && (slp->ns_flag & SLP_VALID) == 0) { 637 TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain); 638 free((caddr_t)slp, M_NFSSVC); 639 } 640 } 641 642 /* 643 * Lock a socket against others. 644 * 645 * XXXRW: Wait argument is always 1 in the caller. Replace with a real 646 * sleep lock? 647 */ 648 int 649 nfs_slplock(struct nfssvc_sock *slp, int wait) 650 { 651 int *statep = &slp->ns_solock; 652 653 NFSD_LOCK_ASSERT(); 654 655 if (!wait && (*statep & NFSRV_SNDLOCK)) 656 return(0); /* already locked, fail */ 657 while (*statep & NFSRV_SNDLOCK) { 658 *statep |= NFSRV_WANTSND; 659 (void) msleep(statep, &nfsd_mtx, PZERO - 1, "nfsslplck", 0); 660 } 661 *statep |= NFSRV_SNDLOCK; 662 return (1); 663 } 664 665 /* 666 * Unlock the stream socket for others. 667 */ 668 void 669 nfs_slpunlock(struct nfssvc_sock *slp) 670 { 671 int *statep = &slp->ns_solock; 672 673 NFSD_LOCK_ASSERT(); 674 675 if ((*statep & NFSRV_SNDLOCK) == 0) 676 panic("nfs slpunlock"); 677 *statep &= ~NFSRV_SNDLOCK; 678 if (*statep & NFSRV_WANTSND) { 679 *statep &= ~NFSRV_WANTSND; 680 wakeup(statep); 681 } 682 } 683 684 /* 685 * Initialize the data structures for the server. 686 * Handshake with any new nfsds starting up to avoid any chance of 687 * corruption. 688 */ 689 void 690 nfsrv_init(int terminating) 691 { 692 struct nfssvc_sock *slp, *nslp; 693 694 NFSD_LOCK_ASSERT(); 695 696 if (nfssvc_sockhead_flag & SLP_INIT) 697 panic("nfsd init"); 698 nfssvc_sockhead_flag |= SLP_INIT; 699 if (terminating) { 700 TAILQ_FOREACH_SAFE(slp, &nfssvc_sockhead, ns_chain, nslp) { 701 if (slp->ns_flag & SLP_VALID) 702 nfsrv_zapsock(slp); 703 TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain); 704 free((caddr_t)slp, M_NFSSVC); 705 } 706 nfsrv_cleancache(); /* And clear out server cache */ 707 } else 708 nfs_pub.np_valid = 0; 709 710 TAILQ_INIT(&nfssvc_sockhead); 711 nfssvc_sockhead_flag &= ~SLP_INIT; 712 if (nfssvc_sockhead_flag & SLP_WANTINIT) { 713 nfssvc_sockhead_flag &= ~SLP_WANTINIT; 714 wakeup(&nfssvc_sockhead); 715 } 716 717 TAILQ_INIT(&nfsd_head); 718 nfsd_head_flag &= ~NFSD_CHECKSLP; 719 720 #if 0 721 nfs_udpsock = (struct nfssvc_sock *) 722 malloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO); 723 STAILQ_INIT(&nfs_udpsock->ns_rec); 724 TAILQ_INSERT_HEAD(&nfssvc_sockhead, nfs_udpsock, ns_chain); 725 726 nfs_cltpsock = (struct nfssvc_sock *) 727 malloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO); 728 STAILQ_INIT(&nfs_cltpsock->ns_rec); 729 TAILQ_INSERT_TAIL(&nfssvc_sockhead, nfs_cltpsock, ns_chain); 730 #endif 731 }
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