1 /* 2 * Copyright (c) 1989, 1991, 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 * %sccs.include.redist.c% 9 * 10 * @(#)nfs_socket.c 8.3 (Berkeley) 01/12/94 11 */ 12 13 /* 14 * Socket operations for use by nfs 15 */ 16 17 #include <sys/param.h> 18 #include <sys/systm.h> 19 #include <sys/proc.h> 20 #include <sys/mount.h> 21 #include <sys/kernel.h> 22 #include <sys/mbuf.h> 23 #include <sys/vnode.h> 24 #include <sys/domain.h> 25 #include <sys/protosw.h> 26 #include <sys/socket.h> 27 #include <sys/socketvar.h> 28 #include <sys/syslog.h> 29 #include <sys/tprintf.h> 30 31 #include <netinet/in.h> 32 #include <netinet/tcp.h> 33 #include <nfs/rpcv2.h> 34 #include <nfs/nfsv2.h> 35 #include <nfs/nfs.h> 36 #include <nfs/xdr_subs.h> 37 #include <nfs/nfsm_subs.h> 38 #include <nfs/nfsmount.h> 39 #include <nfs/nfsnode.h> 40 #include <nfs/nfsrtt.h> 41 #include <nfs/nqnfs.h> 42 43 #define TRUE 1 44 #define FALSE 0 45 46 /* 47 * Estimate rto for an nfs rpc sent via. an unreliable datagram. 48 * Use the mean and mean deviation of rtt for the appropriate type of rpc 49 * for the frequent rpcs and a default for the others. 50 * The justification for doing "other" this way is that these rpcs 51 * happen so infrequently that timer est. would probably be stale. 52 * Also, since many of these rpcs are 53 * non-idempotent, a conservative timeout is desired. 54 * getattr, lookup - A+2D 55 * read, write - A+4D 56 * other - nm_timeo 57 */ 58 #define NFS_RTO(n, t) \ 59 ((t) == 0 ? (n)->nm_timeo : \ 60 ((t) < 3 ? \ 61 (((((n)->nm_srtt[t-1] + 3) >> 2) + (n)->nm_sdrtt[t-1] + 1) >> 1) : \ 62 ((((n)->nm_srtt[t-1] + 7) >> 3) + (n)->nm_sdrtt[t-1] + 1))) 63 #define NFS_SRTT(r) (r)->r_nmp->nm_srtt[proct[(r)->r_procnum] - 1] 64 #define NFS_SDRTT(r) (r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum] - 1] 65 /* 66 * External data, mostly RPC constants in XDR form 67 */ 68 extern u_long rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers, rpc_auth_unix, 69 rpc_msgaccepted, rpc_call, rpc_autherr, rpc_rejectedcred, 70 rpc_auth_kerb; 71 extern u_long nfs_prog, nfs_vers, nqnfs_prog, nqnfs_vers; 72 extern time_t nqnfsstarttime; 73 extern int nonidempotent[NFS_NPROCS]; 74 75 /* 76 * Maps errno values to nfs error numbers. 77 * Use NFSERR_IO as the catch all for ones not specifically defined in 78 * RFC 1094. 79 */ 80 static int nfsrv_errmap[ELAST] = { 81 NFSERR_PERM, NFSERR_NOENT, NFSERR_IO, NFSERR_IO, NFSERR_IO, 82 NFSERR_NXIO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 83 NFSERR_IO, NFSERR_IO, NFSERR_ACCES, NFSERR_IO, NFSERR_IO, 84 NFSERR_IO, NFSERR_EXIST, NFSERR_IO, NFSERR_NODEV, NFSERR_NOTDIR, 85 NFSERR_ISDIR, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 86 NFSERR_IO, NFSERR_FBIG, NFSERR_NOSPC, NFSERR_IO, NFSERR_ROFS, 87 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 88 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 89 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 90 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 91 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 92 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 93 NFSERR_IO, NFSERR_IO, NFSERR_NAMETOL, NFSERR_IO, NFSERR_IO, 94 NFSERR_NOTEMPTY, NFSERR_IO, NFSERR_IO, NFSERR_DQUOT, NFSERR_STALE, 95 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 96 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 97 NFSERR_IO, 98 }; 99 100 /* 101 * Defines which timer to use for the procnum. 102 * 0 - default 103 * 1 - getattr 104 * 2 - lookup 105 * 3 - read 106 * 4 - write 107 */ 108 static int proct[NFS_NPROCS] = { 109 0, 1, 0, 0, 2, 3, 3, 0, 4, 0, 0, 0, 0, 0, 0, 0, 3, 0, 3, 0, 0, 0, 0, 110 }; 111 112 /* 113 * There is a congestion window for outstanding rpcs maintained per mount 114 * point. The cwnd size is adjusted in roughly the way that: 115 * Van Jacobson, Congestion avoidance and Control, In "Proceedings of 116 * SIGCOMM '88". ACM, August 1988. 117 * describes for TCP. The cwnd size is chopped in half on a retransmit timeout 118 * and incremented by 1/cwnd when each rpc reply is received and a full cwnd 119 * of rpcs is in progress. 120 * (The sent count and cwnd are scaled for integer arith.) 121 * Variants of "slow start" were tried and were found to be too much of a 122 * performance hit (ave. rtt 3 times larger), 123 * I suspect due to the large rtt that nfs rpcs have. 124 */ 125 #define NFS_CWNDSCALE 256 126 #define NFS_MAXCWND (NFS_CWNDSCALE * 32) 127 static int nfs_backoff[8] = { 2, 4, 8, 16, 32, 64, 128, 256, }; 128 int nfs_sbwait(); 129 void nfs_disconnect(), nfs_realign(), nfsrv_wakenfsd(), nfs_sndunlock(); 130 void nfs_rcvunlock(), nqnfs_serverd(), nqnfs_clientlease(); 131 struct mbuf *nfsm_rpchead(); 132 int nfsrtton = 0; 133 struct nfsrtt nfsrtt; 134 struct nfsd nfsd_head; 135 136 int nfsrv_null(), 137 nfsrv_getattr(), 138 nfsrv_setattr(), 139 nfsrv_lookup(), 140 nfsrv_readlink(), 141 nfsrv_read(), 142 nfsrv_write(), 143 nfsrv_create(), 144 nfsrv_remove(), 145 nfsrv_rename(), 146 nfsrv_link(), 147 nfsrv_symlink(), 148 nfsrv_mkdir(), 149 nfsrv_rmdir(), 150 nfsrv_readdir(), 151 nfsrv_statfs(), 152 nfsrv_noop(), 153 nqnfsrv_readdirlook(), 154 nqnfsrv_getlease(), 155 nqnfsrv_vacated(), 156 nqnfsrv_access(); 157 158 int (*nfsrv_procs[NFS_NPROCS])() = { 159 nfsrv_null, 160 nfsrv_getattr, 161 nfsrv_setattr, 162 nfsrv_noop, 163 nfsrv_lookup, 164 nfsrv_readlink, 165 nfsrv_read, 166 nfsrv_noop, 167 nfsrv_write, 168 nfsrv_create, 169 nfsrv_remove, 170 nfsrv_rename, 171 nfsrv_link, 172 nfsrv_symlink, 173 nfsrv_mkdir, 174 nfsrv_rmdir, 175 nfsrv_readdir, 176 nfsrv_statfs, 177 nqnfsrv_readdirlook, 178 nqnfsrv_getlease, 179 nqnfsrv_vacated, 180 nfsrv_noop, 181 nqnfsrv_access, 182 }; 183 184 struct nfsreq nfsreqh; 185 186 /* 187 * Initialize sockets and congestion for a new NFS connection. 188 * We do not free the sockaddr if error. 189 */ 190 nfs_connect(nmp, rep) 191 register struct nfsmount *nmp; 192 struct nfsreq *rep; 193 { 194 register struct socket *so; 195 int s, error, rcvreserve, sndreserve; 196 struct sockaddr *saddr; 197 struct sockaddr_in *sin; 198 struct mbuf *m; 199 u_short tport; 200 201 nmp->nm_so = (struct socket *)0; 202 saddr = mtod(nmp->nm_nam, struct sockaddr *); 203 if (error = socreate(saddr->sa_family, 204 &nmp->nm_so, nmp->nm_sotype, nmp->nm_soproto)) 205 goto bad; 206 so = nmp->nm_so; 207 nmp->nm_soflags = so->so_proto->pr_flags; 208 209 /* 210 * Some servers require that the client port be a reserved port number. 211 */ 212 if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) { 213 MGET(m, M_WAIT, MT_SONAME); 214 sin = mtod(m, struct sockaddr_in *); 215 sin->sin_len = m->m_len = sizeof (struct sockaddr_in); 216 sin->sin_family = AF_INET; 217 sin->sin_addr.s_addr = INADDR_ANY; 218 tport = IPPORT_RESERVED - 1; 219 sin->sin_port = htons(tport); 220 while ((error = sobind(so, m)) == EADDRINUSE && 221 --tport > IPPORT_RESERVED / 2) 222 sin->sin_port = htons(tport); 223 m_freem(m); 224 if (error) 225 goto bad; 226 } 227 228 /* 229 * Protocols that do not require connections may be optionally left 230 * unconnected for servers that reply from a port other than NFS_PORT. 231 */ 232 if (nmp->nm_flag & NFSMNT_NOCONN) { 233 if (nmp->nm_soflags & PR_CONNREQUIRED) { 234 error = ENOTCONN; 235 goto bad; 236 } 237 } else { 238 if (error = soconnect(so, nmp->nm_nam)) 239 goto bad; 240 241 /* 242 * Wait for the connection to complete. Cribbed from the 243 * connect system call but with the wait timing out so 244 * that interruptible mounts don't hang here for a long time. 245 */ 246 s = splnet(); 247 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 248 (void) tsleep((caddr_t)&so->so_timeo, PSOCK, 249 "nfscon", 2 * hz); 250 if ((so->so_state & SS_ISCONNECTING) && 251 so->so_error == 0 && rep && 252 (error = nfs_sigintr(nmp, rep, rep->r_procp))) { 253 so->so_state &= ~SS_ISCONNECTING; 254 splx(s); 255 goto bad; 256 } 257 } 258 if (so->so_error) { 259 error = so->so_error; 260 so->so_error = 0; 261 splx(s); 262 goto bad; 263 } 264 splx(s); 265 } 266 if (nmp->nm_flag & (NFSMNT_SOFT | NFSMNT_INT)) { 267 so->so_rcv.sb_timeo = (5 * hz); 268 so->so_snd.sb_timeo = (5 * hz); 269 } else { 270 so->so_rcv.sb_timeo = 0; 271 so->so_snd.sb_timeo = 0; 272 } 273 if (nmp->nm_sotype == SOCK_DGRAM) { 274 sndreserve = nmp->nm_wsize + NFS_MAXPKTHDR; 275 rcvreserve = nmp->nm_rsize + NFS_MAXPKTHDR; 276 } else if (nmp->nm_sotype == SOCK_SEQPACKET) { 277 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2; 278 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR) * 2; 279 } else { 280 if (nmp->nm_sotype != SOCK_STREAM) 281 panic("nfscon sotype"); 282 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 283 MGET(m, M_WAIT, MT_SOOPTS); 284 *mtod(m, int *) = 1; 285 m->m_len = sizeof(int); 286 sosetopt(so, SOL_SOCKET, SO_KEEPALIVE, m); 287 } 288 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 289 MGET(m, M_WAIT, MT_SOOPTS); 290 *mtod(m, int *) = 1; 291 m->m_len = sizeof(int); 292 sosetopt(so, IPPROTO_TCP, TCP_NODELAY, m); 293 } 294 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR + sizeof (u_long)) 295 * 2; 296 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR + sizeof (u_long)) 297 * 2; 298 } 299 if (error = soreserve(so, sndreserve, rcvreserve)) 300 goto bad; 301 so->so_rcv.sb_flags |= SB_NOINTR; 302 so->so_snd.sb_flags |= SB_NOINTR; 303 304 /* Initialize other non-zero congestion variables */ 305 nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] = nmp->nm_srtt[3] = 306 nmp->nm_srtt[4] = (NFS_TIMEO << 3); 307 nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] = 308 nmp->nm_sdrtt[3] = nmp->nm_sdrtt[4] = 0; 309 nmp->nm_cwnd = NFS_MAXCWND / 2; /* Initial send window */ 310 nmp->nm_sent = 0; 311 nmp->nm_timeouts = 0; 312 return (0); 313 314 bad: 315 nfs_disconnect(nmp); 316 return (error); 317 } 318 319 /* 320 * Reconnect routine: 321 * Called when a connection is broken on a reliable protocol. 322 * - clean up the old socket 323 * - nfs_connect() again 324 * - set R_MUSTRESEND for all outstanding requests on mount point 325 * If this fails the mount point is DEAD! 326 * nb: Must be called with the nfs_sndlock() set on the mount point. 327 */ 328 nfs_reconnect(rep) 329 register struct nfsreq *rep; 330 { 331 register struct nfsreq *rp; 332 register struct nfsmount *nmp = rep->r_nmp; 333 int error; 334 335 nfs_disconnect(nmp); 336 while (error = nfs_connect(nmp, rep)) { 337 if (error == EINTR || error == ERESTART) 338 return (EINTR); 339 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfscon", 0); 340 } 341 342 /* 343 * Loop through outstanding request list and fix up all requests 344 * on old socket. 345 */ 346 rp = nfsreqh.r_next; 347 while (rp != &nfsreqh) { 348 if (rp->r_nmp == nmp) 349 rp->r_flags |= R_MUSTRESEND; 350 rp = rp->r_next; 351 } 352 return (0); 353 } 354 355 /* 356 * NFS disconnect. Clean up and unlink. 357 */ 358 void 359 nfs_disconnect(nmp) 360 register struct nfsmount *nmp; 361 { 362 register struct socket *so; 363 364 if (nmp->nm_so) { 365 so = nmp->nm_so; 366 nmp->nm_so = (struct socket *)0; 367 soshutdown(so, 2); 368 soclose(so); 369 } 370 } 371 372 /* 373 * This is the nfs send routine. For connection based socket types, it 374 * must be called with an nfs_sndlock() on the socket. 375 * "rep == NULL" indicates that it has been called from a server. 376 * For the client side: 377 * - return EINTR if the RPC is terminated, 0 otherwise 378 * - set R_MUSTRESEND if the send fails for any reason 379 * - do any cleanup required by recoverable socket errors (???) 380 * For the server side: 381 * - return EINTR or ERESTART if interrupted by a signal 382 * - return EPIPE if a connection is lost for connection based sockets (TCP...) 383 * - do any cleanup required by recoverable socket errors (???) 384 */ 385 nfs_send(so, nam, top, rep) 386 register struct socket *so; 387 struct mbuf *nam; 388 register struct mbuf *top; 389 struct nfsreq *rep; 390 { 391 struct mbuf *sendnam; 392 int error, soflags, flags; 393 394 if (rep) { 395 if (rep->r_flags & R_SOFTTERM) { 396 m_freem(top); 397 return (EINTR); 398 } 399 if ((so = rep->r_nmp->nm_so) == NULL) { 400 rep->r_flags |= R_MUSTRESEND; 401 m_freem(top); 402 return (0); 403 } 404 rep->r_flags &= ~R_MUSTRESEND; 405 soflags = rep->r_nmp->nm_soflags; 406 } else 407 soflags = so->so_proto->pr_flags; 408 if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED)) 409 sendnam = (struct mbuf *)0; 410 else 411 sendnam = nam; 412 if (so->so_type == SOCK_SEQPACKET) 413 flags = MSG_EOR; 414 else 415 flags = 0; 416 417 error = sosend(so, sendnam, (struct uio *)0, top, 418 (struct mbuf *)0, flags); 419 if (error) { 420 if (rep) { 421 log(LOG_INFO, "nfs send error %d for server %s\n",error, 422 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 423 /* 424 * Deal with errors for the client side. 425 */ 426 if (rep->r_flags & R_SOFTTERM) 427 error = EINTR; 428 else 429 rep->r_flags |= R_MUSTRESEND; 430 } else 431 log(LOG_INFO, "nfsd send error %d\n", error); 432 433 /* 434 * Handle any recoverable (soft) socket errors here. (???) 435 */ 436 if (error != EINTR && error != ERESTART && 437 error != EWOULDBLOCK && error != EPIPE) 438 error = 0; 439 } 440 return (error); 441 } 442 443 /* 444 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all 445 * done by soreceive(), but for SOCK_STREAM we must deal with the Record 446 * Mark and consolidate the data into a new mbuf list. 447 * nb: Sometimes TCP passes the data up to soreceive() in long lists of 448 * small mbufs. 449 * For SOCK_STREAM we must be very careful to read an entire record once 450 * we have read any of it, even if the system call has been interrupted. 451 */ 452 nfs_receive(rep, aname, mp) 453 register struct nfsreq *rep; 454 struct mbuf **aname; 455 struct mbuf **mp; 456 { 457 register struct socket *so; 458 struct uio auio; 459 struct iovec aio; 460 register struct mbuf *m; 461 struct mbuf *control; 462 u_long len; 463 struct mbuf **getnam; 464 int error, sotype, rcvflg; 465 struct proc *p = curproc; /* XXX */ 466 467 /* 468 * Set up arguments for soreceive() 469 */ 470 *mp = (struct mbuf *)0; 471 *aname = (struct mbuf *)0; 472 sotype = rep->r_nmp->nm_sotype; 473 474 /* 475 * For reliable protocols, lock against other senders/receivers 476 * in case a reconnect is necessary. 477 * For SOCK_STREAM, first get the Record Mark to find out how much 478 * more there is to get. 479 * We must lock the socket against other receivers 480 * until we have an entire rpc request/reply. 481 */ 482 if (sotype != SOCK_DGRAM) { 483 if (error = nfs_sndlock(&rep->r_nmp->nm_flag, rep)) 484 return (error); 485 tryagain: 486 /* 487 * Check for fatal errors and resending request. 488 */ 489 /* 490 * Ugh: If a reconnect attempt just happened, nm_so 491 * would have changed. NULL indicates a failed 492 * attempt that has essentially shut down this 493 * mount point. 494 */ 495 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) { 496 nfs_sndunlock(&rep->r_nmp->nm_flag); 497 return (EINTR); 498 } 499 if ((so = rep->r_nmp->nm_so) == NULL) { 500 if (error = nfs_reconnect(rep)) { 501 nfs_sndunlock(&rep->r_nmp->nm_flag); 502 return (error); 503 } 504 goto tryagain; 505 } 506 while (rep->r_flags & R_MUSTRESEND) { 507 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 508 nfsstats.rpcretries++; 509 if (error = nfs_send(so, rep->r_nmp->nm_nam, m, rep)) { 510 if (error == EINTR || error == ERESTART || 511 (error = nfs_reconnect(rep))) { 512 nfs_sndunlock(&rep->r_nmp->nm_flag); 513 return (error); 514 } 515 goto tryagain; 516 } 517 } 518 nfs_sndunlock(&rep->r_nmp->nm_flag); 519 if (sotype == SOCK_STREAM) { 520 aio.iov_base = (caddr_t) &len; 521 aio.iov_len = sizeof(u_long); 522 auio.uio_iov = &aio; 523 auio.uio_iovcnt = 1; 524 auio.uio_segflg = UIO_SYSSPACE; 525 auio.uio_rw = UIO_READ; 526 auio.uio_offset = 0; 527 auio.uio_resid = sizeof(u_long); 528 auio.uio_procp = p; 529 do { 530 rcvflg = MSG_WAITALL; 531 error = soreceive(so, (struct mbuf **)0, &auio, 532 (struct mbuf **)0, (struct mbuf **)0, &rcvflg); 533 if (error == EWOULDBLOCK && rep) { 534 if (rep->r_flags & R_SOFTTERM) 535 return (EINTR); 536 } 537 } while (error == EWOULDBLOCK); 538 if (!error && auio.uio_resid > 0) { 539 log(LOG_INFO, 540 "short receive (%d/%d) from nfs server %s\n", 541 sizeof(u_long) - auio.uio_resid, 542 sizeof(u_long), 543 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 544 error = EPIPE; 545 } 546 if (error) 547 goto errout; 548 len = ntohl(len) & ~0x80000000; 549 /* 550 * This is SERIOUS! We are out of sync with the sender 551 * and forcing a disconnect/reconnect is all I can do. 552 */ 553 if (len > NFS_MAXPACKET) { 554 log(LOG_ERR, "%s (%d) from nfs server %s\n", 555 "impossible packet length", 556 len, 557 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 558 error = EFBIG; 559 goto errout; 560 } 561 auio.uio_resid = len; 562 do { 563 rcvflg = MSG_WAITALL; 564 error = soreceive(so, (struct mbuf **)0, 565 &auio, mp, (struct mbuf **)0, &rcvflg); 566 } while (error == EWOULDBLOCK || error == EINTR || 567 error == ERESTART); 568 if (!error && auio.uio_resid > 0) { 569 log(LOG_INFO, 570 "short receive (%d/%d) from nfs server %s\n", 571 len - auio.uio_resid, len, 572 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 573 error = EPIPE; 574 } 575 } else { 576 /* 577 * NB: Since uio_resid is big, MSG_WAITALL is ignored 578 * and soreceive() will return when it has either a 579 * control msg or a data msg. 580 * We have no use for control msg., but must grab them 581 * and then throw them away so we know what is going 582 * on. 583 */ 584 auio.uio_resid = len = 100000000; /* Anything Big */ 585 auio.uio_procp = p; 586 do { 587 rcvflg = 0; 588 error = soreceive(so, (struct mbuf **)0, 589 &auio, mp, &control, &rcvflg); 590 if (control) 591 m_freem(control); 592 if (error == EWOULDBLOCK && rep) { 593 if (rep->r_flags & R_SOFTTERM) 594 return (EINTR); 595 } 596 } while (error == EWOULDBLOCK || 597 (!error && *mp == NULL && control)); 598 if ((rcvflg & MSG_EOR) == 0) 599 printf("Egad!!\n"); 600 if (!error && *mp == NULL) 601 error = EPIPE; 602 len -= auio.uio_resid; 603 } 604 errout: 605 if (error && error != EINTR && error != ERESTART) { 606 m_freem(*mp); 607 *mp = (struct mbuf *)0; 608 if (error != EPIPE) 609 log(LOG_INFO, 610 "receive error %d from nfs server %s\n", 611 error, 612 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 613 error = nfs_sndlock(&rep->r_nmp->nm_flag, rep); 614 if (!error) 615 error = nfs_reconnect(rep); 616 if (!error) 617 goto tryagain; 618 } 619 } else { 620 if ((so = rep->r_nmp->nm_so) == NULL) 621 return (EACCES); 622 if (so->so_state & SS_ISCONNECTED) 623 getnam = (struct mbuf **)0; 624 else 625 getnam = aname; 626 auio.uio_resid = len = 1000000; 627 auio.uio_procp = p; 628 do { 629 rcvflg = 0; 630 error = soreceive(so, getnam, &auio, mp, 631 (struct mbuf **)0, &rcvflg); 632 if (error == EWOULDBLOCK && 633 (rep->r_flags & R_SOFTTERM)) 634 return (EINTR); 635 } while (error == EWOULDBLOCK); 636 len -= auio.uio_resid; 637 } 638 if (error) { 639 m_freem(*mp); 640 *mp = (struct mbuf *)0; 641 } 642 /* 643 * Search for any mbufs that are not a multiple of 4 bytes long 644 * or with m_data not longword aligned. 645 * These could cause pointer alignment problems, so copy them to 646 * well aligned mbufs. 647 */ 648 nfs_realign(*mp, 5 * NFSX_UNSIGNED); 649 return (error); 650 } 651 652 /* 653 * Implement receipt of reply on a socket. 654 * We must search through the list of received datagrams matching them 655 * with outstanding requests using the xid, until ours is found. 656 */ 657 /* ARGSUSED */ 658 nfs_reply(myrep) 659 struct nfsreq *myrep; 660 { 661 register struct nfsreq *rep; 662 register struct nfsmount *nmp = myrep->r_nmp; 663 register long t1; 664 struct mbuf *mrep, *nam, *md; 665 u_long rxid, *tl; 666 caddr_t dpos, cp2; 667 int error; 668 669 /* 670 * Loop around until we get our own reply 671 */ 672 for (;;) { 673 /* 674 * Lock against other receivers so that I don't get stuck in 675 * sbwait() after someone else has received my reply for me. 676 * Also necessary for connection based protocols to avoid 677 * race conditions during a reconnect. 678 */ 679 if (error = nfs_rcvlock(myrep)) 680 return (error); 681 /* Already received, bye bye */ 682 if (myrep->r_mrep != NULL) { 683 nfs_rcvunlock(&nmp->nm_flag); 684 return (0); 685 } 686 /* 687 * Get the next Rpc reply off the socket 688 */ 689 error = nfs_receive(myrep, &nam, &mrep); 690 nfs_rcvunlock(&nmp->nm_flag); 691 if (error) { 692 693 /* 694 * Ignore routing errors on connectionless protocols?? 695 */ 696 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 697 nmp->nm_so->so_error = 0; 698 if (myrep->r_flags & R_GETONEREP) 699 return (0); 700 continue; 701 } 702 return (error); 703 } 704 if (nam) 705 m_freem(nam); 706 707 /* 708 * Get the xid and check that it is an rpc reply 709 */ 710 md = mrep; 711 dpos = mtod(md, caddr_t); 712 nfsm_dissect(tl, u_long *, 2*NFSX_UNSIGNED); 713 rxid = *tl++; 714 if (*tl != rpc_reply) { 715 if (nmp->nm_flag & NFSMNT_NQNFS) { 716 if (nqnfs_callback(nmp, mrep, md, dpos)) 717 nfsstats.rpcinvalid++; 718 } else { 719 nfsstats.rpcinvalid++; 720 m_freem(mrep); 721 } 722 nfsmout: 723 if (myrep->r_flags & R_GETONEREP) 724 return (0); 725 continue; 726 } 727 728 /* 729 * Loop through the request list to match up the reply 730 * Iff no match, just drop the datagram 731 */ 732 rep = nfsreqh.r_next; 733 while (rep != &nfsreqh) { 734 if (rep->r_mrep == NULL && rxid == rep->r_xid) { 735 /* Found it.. */ 736 rep->r_mrep = mrep; 737 rep->r_md = md; 738 rep->r_dpos = dpos; 739 if (nfsrtton) { 740 struct rttl *rt; 741 742 rt = &nfsrtt.rttl[nfsrtt.pos]; 743 rt->proc = rep->r_procnum; 744 rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]); 745 rt->sent = nmp->nm_sent; 746 rt->cwnd = nmp->nm_cwnd; 747 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1]; 748 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1]; 749 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsid; 750 rt->tstamp = time; 751 if (rep->r_flags & R_TIMING) 752 rt->rtt = rep->r_rtt; 753 else 754 rt->rtt = 1000000; 755 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ; 756 } 757 /* 758 * Update congestion window. 759 * Do the additive increase of 760 * one rpc/rtt. 761 */ 762 if (nmp->nm_cwnd <= nmp->nm_sent) { 763 nmp->nm_cwnd += 764 (NFS_CWNDSCALE * NFS_CWNDSCALE + 765 (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd; 766 if (nmp->nm_cwnd > NFS_MAXCWND) 767 nmp->nm_cwnd = NFS_MAXCWND; 768 } 769 rep->r_flags &= ~R_SENT; 770 nmp->nm_sent -= NFS_CWNDSCALE; 771 /* 772 * Update rtt using a gain of 0.125 on the mean 773 * and a gain of 0.25 on the deviation. 774 */ 775 if (rep->r_flags & R_TIMING) { 776 /* 777 * Since the timer resolution of 778 * NFS_HZ is so course, it can often 779 * result in r_rtt == 0. Since 780 * r_rtt == N means that the actual 781 * rtt is between N+dt and N+2-dt ticks, 782 * add 1. 783 */ 784 t1 = rep->r_rtt + 1; 785 t1 -= (NFS_SRTT(rep) >> 3); 786 NFS_SRTT(rep) += t1; 787 if (t1 < 0) 788 t1 = -t1; 789 t1 -= (NFS_SDRTT(rep) >> 2); 790 NFS_SDRTT(rep) += t1; 791 } 792 nmp->nm_timeouts = 0; 793 break; 794 } 795 rep = rep->r_next; 796 } 797 /* 798 * If not matched to a request, drop it. 799 * If it's mine, get out. 800 */ 801 if (rep == &nfsreqh) { 802 nfsstats.rpcunexpected++; 803 m_freem(mrep); 804 } else if (rep == myrep) { 805 if (rep->r_mrep == NULL) 806 panic("nfsreply nil"); 807 return (0); 808 } 809 if (myrep->r_flags & R_GETONEREP) 810 return (0); 811 } 812 } 813 814 /* 815 * nfs_request - goes something like this 816 * - fill in request struct 817 * - links it into list 818 * - calls nfs_send() for first transmit 819 * - calls nfs_receive() to get reply 820 * - break down rpc header and return with nfs reply pointed to 821 * by mrep or error 822 * nb: always frees up mreq mbuf list 823 */ 824 nfs_request(vp, mrest, procnum, procp, cred, mrp, mdp, dposp) 825 struct vnode *vp; 826 struct mbuf *mrest; 827 int procnum; 828 struct proc *procp; 829 struct ucred *cred; 830 struct mbuf **mrp; 831 struct mbuf **mdp; 832 caddr_t *dposp; 833 { 834 register struct mbuf *m, *mrep; 835 register struct nfsreq *rep; 836 register u_long *tl; 837 register int i; 838 struct nfsmount *nmp; 839 struct mbuf *md, *mheadend; 840 struct nfsreq *reph; 841 struct nfsnode *np; 842 time_t reqtime, waituntil; 843 caddr_t dpos, cp2; 844 int t1, nqlflag, cachable, s, error = 0, mrest_len, auth_len, auth_type; 845 int trylater_delay = NQ_TRYLATERDEL, trylater_cnt = 0, failed_auth = 0; 846 u_long xid; 847 u_quad_t frev; 848 char *auth_str; 849 850 nmp = VFSTONFS(vp->v_mount); 851 MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq), M_NFSREQ, M_WAITOK); 852 rep->r_nmp = nmp; 853 rep->r_vp = vp; 854 rep->r_procp = procp; 855 rep->r_procnum = procnum; 856 i = 0; 857 m = mrest; 858 while (m) { 859 i += m->m_len; 860 m = m->m_next; 861 } 862 mrest_len = i; 863 864 /* 865 * Get the RPC header with authorization. 866 */ 867 kerbauth: 868 auth_str = (char *)0; 869 if (nmp->nm_flag & NFSMNT_KERB) { 870 if (failed_auth) { 871 error = nfs_getauth(nmp, rep, cred, &auth_type, 872 &auth_str, &auth_len); 873 if (error) { 874 free((caddr_t)rep, M_NFSREQ); 875 m_freem(mrest); 876 return (error); 877 } 878 } else { 879 auth_type = RPCAUTH_UNIX; 880 auth_len = 5 * NFSX_UNSIGNED; 881 } 882 } else { 883 auth_type = RPCAUTH_UNIX; 884 if (cred->cr_ngroups < 1) 885 panic("nfsreq nogrps"); 886 auth_len = ((((cred->cr_ngroups - 1) > nmp->nm_numgrps) ? 887 nmp->nm_numgrps : (cred->cr_ngroups - 1)) << 2) + 888 5 * NFSX_UNSIGNED; 889 } 890 m = nfsm_rpchead(cred, (nmp->nm_flag & NFSMNT_NQNFS), procnum, 891 auth_type, auth_len, auth_str, mrest, mrest_len, &mheadend, &xid); 892 if (auth_str) 893 free(auth_str, M_TEMP); 894 895 /* 896 * For stream protocols, insert a Sun RPC Record Mark. 897 */ 898 if (nmp->nm_sotype == SOCK_STREAM) { 899 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 900 *mtod(m, u_long *) = htonl(0x80000000 | 901 (m->m_pkthdr.len - NFSX_UNSIGNED)); 902 } 903 rep->r_mreq = m; 904 rep->r_xid = xid; 905 tryagain: 906 if (nmp->nm_flag & NFSMNT_SOFT) 907 rep->r_retry = nmp->nm_retry; 908 else 909 rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */ 910 rep->r_rtt = rep->r_rexmit = 0; 911 if (proct[procnum] > 0) 912 rep->r_flags = R_TIMING; 913 else 914 rep->r_flags = 0; 915 rep->r_mrep = NULL; 916 917 /* 918 * Do the client side RPC. 919 */ 920 nfsstats.rpcrequests++; 921 /* 922 * Chain request into list of outstanding requests. Be sure 923 * to put it LAST so timer finds oldest requests first. 924 */ 925 s = splsoftclock(); 926 reph = &nfsreqh; 927 reph->r_prev->r_next = rep; 928 rep->r_prev = reph->r_prev; 929 reph->r_prev = rep; 930 rep->r_next = reph; 931 932 /* Get send time for nqnfs */ 933 reqtime = time.tv_sec; 934 935 /* 936 * If backing off another request or avoiding congestion, don't 937 * send this one now but let timer do it. If not timing a request, 938 * do it now. 939 */ 940 if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM || 941 (nmp->nm_flag & NFSMNT_DUMBTIMR) || 942 nmp->nm_sent < nmp->nm_cwnd)) { 943 splx(s); 944 if (nmp->nm_soflags & PR_CONNREQUIRED) 945 error = nfs_sndlock(&nmp->nm_flag, rep); 946 if (!error) { 947 m = m_copym(m, 0, M_COPYALL, M_WAIT); 948 error = nfs_send(nmp->nm_so, nmp->nm_nam, m, rep); 949 if (nmp->nm_soflags & PR_CONNREQUIRED) 950 nfs_sndunlock(&nmp->nm_flag); 951 } 952 if (!error && (rep->r_flags & R_MUSTRESEND) == 0) { 953 nmp->nm_sent += NFS_CWNDSCALE; 954 rep->r_flags |= R_SENT; 955 } 956 } else { 957 splx(s); 958 rep->r_rtt = -1; 959 } 960 961 /* 962 * Wait for the reply from our send or the timer's. 963 */ 964 if (!error || error == EPIPE) 965 error = nfs_reply(rep); 966 967 /* 968 * RPC done, unlink the request. 969 */ 970 s = splsoftclock(); 971 rep->r_prev->r_next = rep->r_next; 972 rep->r_next->r_prev = rep->r_prev; 973 splx(s); 974 975 /* 976 * Decrement the outstanding request count. 977 */ 978 if (rep->r_flags & R_SENT) { 979 rep->r_flags &= ~R_SENT; /* paranoia */ 980 nmp->nm_sent -= NFS_CWNDSCALE; 981 } 982 983 /* 984 * If there was a successful reply and a tprintf msg. 985 * tprintf a response. 986 */ 987 if (!error && (rep->r_flags & R_TPRINTFMSG)) 988 nfs_msg(rep->r_procp, nmp->nm_mountp->mnt_stat.f_mntfromname, 989 "is alive again"); 990 mrep = rep->r_mrep; 991 md = rep->r_md; 992 dpos = rep->r_dpos; 993 if (error) { 994 m_freem(rep->r_mreq); 995 free((caddr_t)rep, M_NFSREQ); 996 return (error); 997 } 998 999 /* 1000 * break down the rpc header and check if ok 1001 */ 1002 nfsm_dissect(tl, u_long *, 3*NFSX_UNSIGNED); 1003 if (*tl++ == rpc_msgdenied) { 1004 if (*tl == rpc_mismatch) 1005 error = EOPNOTSUPP; 1006 else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) { 1007 if (*tl == rpc_rejectedcred && failed_auth == 0) { 1008 failed_auth++; 1009 mheadend->m_next = (struct mbuf *)0; 1010 m_freem(mrep); 1011 m_freem(rep->r_mreq); 1012 goto kerbauth; 1013 } else 1014 error = EAUTH; 1015 } else 1016 error = EACCES; 1017 m_freem(mrep); 1018 m_freem(rep->r_mreq); 1019 free((caddr_t)rep, M_NFSREQ); 1020 return (error); 1021 } 1022 1023 /* 1024 * skip over the auth_verf, someday we may want to cache auth_short's 1025 * for nfs_reqhead(), but for now just dump it 1026 */ 1027 if (*++tl != 0) { 1028 i = nfsm_rndup(fxdr_unsigned(long, *tl)); 1029 nfsm_adv(i); 1030 } 1031 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); 1032 /* 0 == ok */ 1033 if (*tl == 0) { 1034 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); 1035 if (*tl != 0) { 1036 error = fxdr_unsigned(int, *tl); 1037 m_freem(mrep); 1038 if ((nmp->nm_flag & NFSMNT_NQNFS) && 1039 error == NQNFS_TRYLATER) { 1040 error = 0; 1041 waituntil = time.tv_sec + trylater_delay; 1042 while (time.tv_sec < waituntil) 1043 (void) tsleep((caddr_t)&lbolt, 1044 PSOCK, "nqnfstry", 0); 1045 trylater_delay *= nfs_backoff[trylater_cnt]; 1046 if (trylater_cnt < 7) 1047 trylater_cnt++; 1048 goto tryagain; 1049 } 1050 1051 /* 1052 * If the File Handle was stale, invalidate the 1053 * lookup cache, just in case. 1054 */ 1055 if (error == ESTALE) 1056 cache_purge(vp); 1057 m_freem(rep->r_mreq); 1058 free((caddr_t)rep, M_NFSREQ); 1059 return (error); 1060 } 1061 1062 /* 1063 * For nqnfs, get any lease in reply 1064 */ 1065 if (nmp->nm_flag & NFSMNT_NQNFS) { 1066 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); 1067 if (*tl) { 1068 np = VTONFS(vp); 1069 nqlflag = fxdr_unsigned(int, *tl); 1070 nfsm_dissect(tl, u_long *, 4*NFSX_UNSIGNED); 1071 cachable = fxdr_unsigned(int, *tl++); 1072 reqtime += fxdr_unsigned(int, *tl++); 1073 if (reqtime > time.tv_sec) { 1074 fxdr_hyper(tl, &frev); 1075 nqnfs_clientlease(nmp, np, nqlflag, 1076 cachable, reqtime, frev); 1077 } 1078 } 1079 } 1080 *mrp = mrep; 1081 *mdp = md; 1082 *dposp = dpos; 1083 m_freem(rep->r_mreq); 1084 FREE((caddr_t)rep, M_NFSREQ); 1085 return (0); 1086 } 1087 m_freem(mrep); 1088 m_freem(rep->r_mreq); 1089 free((caddr_t)rep, M_NFSREQ); 1090 error = EPROTONOSUPPORT; 1091 nfsmout: 1092 return (error); 1093 } 1094 1095 /* 1096 * Generate the rpc reply header 1097 * siz arg. is used to decide if adding a cluster is worthwhile 1098 */ 1099 nfs_rephead(siz, nd, err, cache, frev, mrq, mbp, bposp) 1100 int siz; 1101 struct nfsd *nd; 1102 int err; 1103 int cache; 1104 u_quad_t *frev; 1105 struct mbuf **mrq; 1106 struct mbuf **mbp; 1107 caddr_t *bposp; 1108 { 1109 register u_long *tl; 1110 register struct mbuf *mreq; 1111 caddr_t bpos; 1112 struct mbuf *mb, *mb2; 1113 1114 MGETHDR(mreq, M_WAIT, MT_DATA); 1115 mb = mreq; 1116 /* 1117 * If this is a big reply, use a cluster else 1118 * try and leave leading space for the lower level headers. 1119 */ 1120 siz += RPC_REPLYSIZ; 1121 if (siz >= MINCLSIZE) { 1122 MCLGET(mreq, M_WAIT); 1123 } else 1124 mreq->m_data += max_hdr; 1125 tl = mtod(mreq, u_long *); 1126 mreq->m_len = 6*NFSX_UNSIGNED; 1127 bpos = ((caddr_t)tl)+mreq->m_len; 1128 *tl++ = nd->nd_retxid; 1129 *tl++ = rpc_reply; 1130 if (err == ERPCMISMATCH || err == NQNFS_AUTHERR) { 1131 *tl++ = rpc_msgdenied; 1132 if (err == NQNFS_AUTHERR) { 1133 *tl++ = rpc_autherr; 1134 *tl = rpc_rejectedcred; 1135 mreq->m_len -= NFSX_UNSIGNED; 1136 bpos -= NFSX_UNSIGNED; 1137 } else { 1138 *tl++ = rpc_mismatch; 1139 *tl++ = txdr_unsigned(2); 1140 *tl = txdr_unsigned(2); 1141 } 1142 } else { 1143 *tl++ = rpc_msgaccepted; 1144 *tl++ = 0; 1145 *tl++ = 0; 1146 switch (err) { 1147 case EPROGUNAVAIL: 1148 *tl = txdr_unsigned(RPC_PROGUNAVAIL); 1149 break; 1150 case EPROGMISMATCH: 1151 *tl = txdr_unsigned(RPC_PROGMISMATCH); 1152 nfsm_build(tl, u_long *, 2*NFSX_UNSIGNED); 1153 *tl++ = txdr_unsigned(2); 1154 *tl = txdr_unsigned(2); /* someday 3 */ 1155 break; 1156 case EPROCUNAVAIL: 1157 *tl = txdr_unsigned(RPC_PROCUNAVAIL); 1158 break; 1159 default: 1160 *tl = 0; 1161 if (err != VNOVAL) { 1162 nfsm_build(tl, u_long *, NFSX_UNSIGNED); 1163 if (err) 1164 *tl = txdr_unsigned(nfsrv_errmap[err - 1]); 1165 else 1166 *tl = 0; 1167 } 1168 break; 1169 }; 1170 } 1171 1172 /* 1173 * For nqnfs, piggyback lease as requested. 1174 */ 1175 if (nd->nd_nqlflag != NQL_NOVAL && err == 0) { 1176 if (nd->nd_nqlflag) { 1177 nfsm_build(tl, u_long *, 5*NFSX_UNSIGNED); 1178 *tl++ = txdr_unsigned(nd->nd_nqlflag); 1179 *tl++ = txdr_unsigned(cache); 1180 *tl++ = txdr_unsigned(nd->nd_duration); 1181 txdr_hyper(frev, tl); 1182 } else { 1183 if (nd->nd_nqlflag != 0) 1184 panic("nqreph"); 1185 nfsm_build(tl, u_long *, NFSX_UNSIGNED); 1186 *tl = 0; 1187 } 1188 } 1189 *mrq = mreq; 1190 *mbp = mb; 1191 *bposp = bpos; 1192 if (err != 0 && err != VNOVAL) 1193 nfsstats.srvrpc_errs++; 1194 return (0); 1195 } 1196 1197 /* 1198 * Nfs timer routine 1199 * Scan the nfsreq list and retranmit any requests that have timed out 1200 * To avoid retransmission attempts on STREAM sockets (in the future) make 1201 * sure to set the r_retry field to 0 (implies nm_retry == 0). 1202 */ 1203 void 1204 nfs_timer(arg) 1205 void *arg; 1206 { 1207 register struct nfsreq *rep; 1208 register struct mbuf *m; 1209 register struct socket *so; 1210 register struct nfsmount *nmp; 1211 register int timeo; 1212 static long lasttime = 0; 1213 int s, error; 1214 1215 s = splnet(); 1216 for (rep = nfsreqh.r_next; rep != &nfsreqh; rep = rep->r_next) { 1217 nmp = rep->r_nmp; 1218 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) 1219 continue; 1220 if (nfs_sigintr(nmp, rep, rep->r_procp)) { 1221 rep->r_flags |= R_SOFTTERM; 1222 continue; 1223 } 1224 if (rep->r_rtt >= 0) { 1225 rep->r_rtt++; 1226 if (nmp->nm_flag & NFSMNT_DUMBTIMR) 1227 timeo = nmp->nm_timeo; 1228 else 1229 timeo = NFS_RTO(nmp, proct[rep->r_procnum]); 1230 if (nmp->nm_timeouts > 0) 1231 timeo *= nfs_backoff[nmp->nm_timeouts - 1]; 1232 if (rep->r_rtt <= timeo) 1233 continue; 1234 if (nmp->nm_timeouts < 8) 1235 nmp->nm_timeouts++; 1236 } 1237 /* 1238 * Check for server not responding 1239 */ 1240 if ((rep->r_flags & R_TPRINTFMSG) == 0 && 1241 rep->r_rexmit > nmp->nm_deadthresh) { 1242 nfs_msg(rep->r_procp, 1243 nmp->nm_mountp->mnt_stat.f_mntfromname, 1244 "not responding"); 1245 rep->r_flags |= R_TPRINTFMSG; 1246 } 1247 if (rep->r_rexmit >= rep->r_retry) { /* too many */ 1248 nfsstats.rpctimeouts++; 1249 rep->r_flags |= R_SOFTTERM; 1250 continue; 1251 } 1252 if (nmp->nm_sotype != SOCK_DGRAM) { 1253 if (++rep->r_rexmit > NFS_MAXREXMIT) 1254 rep->r_rexmit = NFS_MAXREXMIT; 1255 continue; 1256 } 1257 if ((so = nmp->nm_so) == NULL) 1258 continue; 1259 1260 /* 1261 * If there is enough space and the window allows.. 1262 * Resend it 1263 * Set r_rtt to -1 in case we fail to send it now. 1264 */ 1265 rep->r_rtt = -1; 1266 if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len && 1267 ((nmp->nm_flag & NFSMNT_DUMBTIMR) || 1268 (rep->r_flags & R_SENT) || 1269 nmp->nm_sent < nmp->nm_cwnd) && 1270 (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){ 1271 if ((nmp->nm_flag & NFSMNT_NOCONN) == 0) 1272 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1273 (struct mbuf *)0, (struct mbuf *)0); 1274 else 1275 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1276 nmp->nm_nam, (struct mbuf *)0); 1277 if (error) { 1278 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) 1279 so->so_error = 0; 1280 } else { 1281 /* 1282 * Iff first send, start timing 1283 * else turn timing off, backoff timer 1284 * and divide congestion window by 2. 1285 */ 1286 if (rep->r_flags & R_SENT) { 1287 rep->r_flags &= ~R_TIMING; 1288 if (++rep->r_rexmit > NFS_MAXREXMIT) 1289 rep->r_rexmit = NFS_MAXREXMIT; 1290 nmp->nm_cwnd >>= 1; 1291 if (nmp->nm_cwnd < NFS_CWNDSCALE) 1292 nmp->nm_cwnd = NFS_CWNDSCALE; 1293 nfsstats.rpcretries++; 1294 } else { 1295 rep->r_flags |= R_SENT; 1296 nmp->nm_sent += NFS_CWNDSCALE; 1297 } 1298 rep->r_rtt = 0; 1299 } 1300 } 1301 } 1302 1303 /* 1304 * Call the nqnfs server timer once a second to handle leases. 1305 */ 1306 if (lasttime != time.tv_sec) { 1307 lasttime = time.tv_sec; 1308 nqnfs_serverd(); 1309 } 1310 splx(s); 1311 timeout(nfs_timer, (void *)0, hz / NFS_HZ); 1312 } 1313 1314 /* 1315 * Test for a termination condition pending on the process. 1316 * This is used for NFSMNT_INT mounts. 1317 */ 1318 nfs_sigintr(nmp, rep, p) 1319 struct nfsmount *nmp; 1320 struct nfsreq *rep; 1321 register struct proc *p; 1322 { 1323 1324 if (rep && (rep->r_flags & R_SOFTTERM)) 1325 return (EINTR); 1326 if (!(nmp->nm_flag & NFSMNT_INT)) 1327 return (0); 1328 if (p && p->p_siglist && 1329 (((p->p_siglist & ~p->p_sigmask) & ~p->p_sigignore) & 1330 NFSINT_SIGMASK)) 1331 return (EINTR); 1332 return (0); 1333 } 1334 1335 /* 1336 * Lock a socket against others. 1337 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply 1338 * and also to avoid race conditions between the processes with nfs requests 1339 * in progress when a reconnect is necessary. 1340 */ 1341 nfs_sndlock(flagp, rep) 1342 register int *flagp; 1343 struct nfsreq *rep; 1344 { 1345 struct proc *p; 1346 int slpflag = 0, slptimeo = 0; 1347 1348 if (rep) { 1349 p = rep->r_procp; 1350 if (rep->r_nmp->nm_flag & NFSMNT_INT) 1351 slpflag = PCATCH; 1352 } else 1353 p = (struct proc *)0; 1354 while (*flagp & NFSMNT_SNDLOCK) { 1355 if (nfs_sigintr(rep->r_nmp, rep, p)) 1356 return (EINTR); 1357 *flagp |= NFSMNT_WANTSND; 1358 (void) tsleep((caddr_t)flagp, slpflag | (PZERO - 1), "nfsndlck", 1359 slptimeo); 1360 if (slpflag == PCATCH) { 1361 slpflag = 0; 1362 slptimeo = 2 * hz; 1363 } 1364 } 1365 *flagp |= NFSMNT_SNDLOCK; 1366 return (0); 1367 } 1368 1369 /* 1370 * Unlock the stream socket for others. 1371 */ 1372 void 1373 nfs_sndunlock(flagp) 1374 register int *flagp; 1375 { 1376 1377 if ((*flagp & NFSMNT_SNDLOCK) == 0) 1378 panic("nfs sndunlock"); 1379 *flagp &= ~NFSMNT_SNDLOCK; 1380 if (*flagp & NFSMNT_WANTSND) { 1381 *flagp &= ~NFSMNT_WANTSND; 1382 wakeup((caddr_t)flagp); 1383 } 1384 } 1385 1386 nfs_rcvlock(rep) 1387 register struct nfsreq *rep; 1388 { 1389 register int *flagp = &rep->r_nmp->nm_flag; 1390 int slpflag, slptimeo = 0; 1391 1392 if (*flagp & NFSMNT_INT) 1393 slpflag = PCATCH; 1394 else 1395 slpflag = 0; 1396 while (*flagp & NFSMNT_RCVLOCK) { 1397 if (nfs_sigintr(rep->r_nmp, rep, rep->r_procp)) 1398 return (EINTR); 1399 *flagp |= NFSMNT_WANTRCV; 1400 (void) tsleep((caddr_t)flagp, slpflag | (PZERO - 1), "nfsrcvlk", 1401 slptimeo); 1402 if (slpflag == PCATCH) { 1403 slpflag = 0; 1404 slptimeo = 2 * hz; 1405 } 1406 } 1407 *flagp |= NFSMNT_RCVLOCK; 1408 return (0); 1409 } 1410 1411 /* 1412 * Unlock the stream socket for others. 1413 */ 1414 void 1415 nfs_rcvunlock(flagp) 1416 register int *flagp; 1417 { 1418 1419 if ((*flagp & NFSMNT_RCVLOCK) == 0) 1420 panic("nfs rcvunlock"); 1421 *flagp &= ~NFSMNT_RCVLOCK; 1422 if (*flagp & NFSMNT_WANTRCV) { 1423 *flagp &= ~NFSMNT_WANTRCV; 1424 wakeup((caddr_t)flagp); 1425 } 1426 } 1427 1428 /* 1429 * Check for badly aligned mbuf data areas and 1430 * realign data in an mbuf list by copying the data areas up, as required. 1431 */ 1432 void 1433 nfs_realign(m, hsiz) 1434 register struct mbuf *m; 1435 int hsiz; 1436 { 1437 register struct mbuf *m2; 1438 register int siz, mlen, olen; 1439 register caddr_t tcp, fcp; 1440 struct mbuf *mnew; 1441 1442 while (m) { 1443 /* 1444 * This never happens for UDP, rarely happens for TCP 1445 * but frequently happens for iso transport. 1446 */ 1447 if ((m->m_len & 0x3) || (mtod(m, int) & 0x3)) { 1448 olen = m->m_len; 1449 fcp = mtod(m, caddr_t); 1450 if ((int)fcp & 0x3) { 1451 m->m_flags &= ~M_PKTHDR; 1452 if (m->m_flags & M_EXT) 1453 m->m_data = m->m_ext.ext_buf + 1454 ((m->m_ext.ext_size - olen) & ~0x3); 1455 else 1456 m->m_data = m->m_dat; 1457 } 1458 m->m_len = 0; 1459 tcp = mtod(m, caddr_t); 1460 mnew = m; 1461 m2 = m->m_next; 1462 1463 /* 1464 * If possible, only put the first invariant part 1465 * of the RPC header in the first mbuf. 1466 */ 1467 mlen = M_TRAILINGSPACE(m); 1468 if (olen <= hsiz && mlen > hsiz) 1469 mlen = hsiz; 1470 1471 /* 1472 * Loop through the mbuf list consolidating data. 1473 */ 1474 while (m) { 1475 while (olen > 0) { 1476 if (mlen == 0) { 1477 m2->m_flags &= ~M_PKTHDR; 1478 if (m2->m_flags & M_EXT) 1479 m2->m_data = m2->m_ext.ext_buf; 1480 else 1481 m2->m_data = m2->m_dat; 1482 m2->m_len = 0; 1483 mlen = M_TRAILINGSPACE(m2); 1484 tcp = mtod(m2, caddr_t); 1485 mnew = m2; 1486 m2 = m2->m_next; 1487 } 1488 siz = min(mlen, olen); 1489 if (tcp != fcp) 1490 bcopy(fcp, tcp, siz); 1491 mnew->m_len += siz; 1492 mlen -= siz; 1493 olen -= siz; 1494 tcp += siz; 1495 fcp += siz; 1496 } 1497 m = m->m_next; 1498 if (m) { 1499 olen = m->m_len; 1500 fcp = mtod(m, caddr_t); 1501 } 1502 } 1503 1504 /* 1505 * Finally, set m_len == 0 for any trailing mbufs that have 1506 * been copied out of. 1507 */ 1508 while (m2) { 1509 m2->m_len = 0; 1510 m2 = m2->m_next; 1511 } 1512 return; 1513 } 1514 m = m->m_next; 1515 } 1516 } 1517 1518 /* 1519 * Socket upcall routine for the nfsd sockets. 1520 * The caddr_t arg is a pointer to the "struct nfssvc_sock". 1521 * Essentially do as much as possible non-blocking, else punt and it will 1522 * be called with M_WAIT from an nfsd. 1523 */ 1524 void 1525 nfsrv_rcv(so, arg, waitflag) 1526 struct socket *so; 1527 caddr_t arg; 1528 int waitflag; 1529 { 1530 register struct nfssvc_sock *slp = (struct nfssvc_sock *)arg; 1531 register struct mbuf *m; 1532 struct mbuf *mp, *nam; 1533 struct uio auio; 1534 int flags, error; 1535 1536 if ((slp->ns_flag & SLP_VALID) == 0) 1537 return; 1538 #ifdef notdef 1539 /* 1540 * Define this to test for nfsds handling this under heavy load. 1541 */ 1542 if (waitflag == M_DONTWAIT) { 1543 slp->ns_flag |= SLP_NEEDQ; goto dorecs; 1544 } 1545 #endif 1546 auio.uio_procp = NULL; 1547 if (so->so_type == SOCK_STREAM) { 1548 /* 1549 * If there are already records on the queue, defer soreceive() 1550 * to an nfsd so that there is feedback to the TCP layer that 1551 * the nfs servers are heavily loaded. 1552 */ 1553 if (slp->ns_rec && waitflag == M_DONTWAIT) { 1554 slp->ns_flag |= SLP_NEEDQ; 1555 goto dorecs; 1556 } 1557 1558 /* 1559 * Do soreceive(). 1560 */ 1561 auio.uio_resid = 1000000000; 1562 flags = MSG_DONTWAIT; 1563 error = soreceive(so, &nam, &auio, &mp, (struct mbuf **)0, &flags); 1564 if (error || mp == (struct mbuf *)0) { 1565 if (error == EWOULDBLOCK) 1566 slp->ns_flag |= SLP_NEEDQ; 1567 else 1568 slp->ns_flag |= SLP_DISCONN; 1569 goto dorecs; 1570 } 1571 m = mp; 1572 if (slp->ns_rawend) { 1573 slp->ns_rawend->m_next = m; 1574 slp->ns_cc += 1000000000 - auio.uio_resid; 1575 } else { 1576 slp->ns_raw = m; 1577 slp->ns_cc = 1000000000 - auio.uio_resid; 1578 } 1579 while (m->m_next) 1580 m = m->m_next; 1581 slp->ns_rawend = m; 1582 1583 /* 1584 * Now try and parse record(s) out of the raw stream data. 1585 */ 1586 if (error = nfsrv_getstream(slp, waitflag)) { 1587 if (error == EPERM) 1588 slp->ns_flag |= SLP_DISCONN; 1589 else 1590 slp->ns_flag |= SLP_NEEDQ; 1591 } 1592 } else { 1593 do { 1594 auio.uio_resid = 1000000000; 1595 flags = MSG_DONTWAIT; 1596 error = soreceive(so, &nam, &auio, &mp, 1597 (struct mbuf **)0, &flags); 1598 if (mp) { 1599 nfs_realign(mp, 10 * NFSX_UNSIGNED); 1600 if (nam) { 1601 m = nam; 1602 m->m_next = mp; 1603 } else 1604 m = mp; 1605 if (slp->ns_recend) 1606 slp->ns_recend->m_nextpkt = m; 1607 else 1608 slp->ns_rec = m; 1609 slp->ns_recend = m; 1610 m->m_nextpkt = (struct mbuf *)0; 1611 } 1612 if (error) { 1613 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) 1614 && error != EWOULDBLOCK) { 1615 slp->ns_flag |= SLP_DISCONN; 1616 goto dorecs; 1617 } 1618 } 1619 } while (mp); 1620 } 1621 1622 /* 1623 * Now try and process the request records, non-blocking. 1624 */ 1625 dorecs: 1626 if (waitflag == M_DONTWAIT && 1627 (slp->ns_rec || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN)))) 1628 nfsrv_wakenfsd(slp); 1629 } 1630 1631 /* 1632 * Try and extract an RPC request from the mbuf data list received on a 1633 * stream socket. The "waitflag" argument indicates whether or not it 1634 * can sleep. 1635 */ 1636 nfsrv_getstream(slp, waitflag) 1637 register struct nfssvc_sock *slp; 1638 int waitflag; 1639 { 1640 register struct mbuf *m; 1641 register char *cp1, *cp2; 1642 register int len; 1643 struct mbuf *om, *m2, *recm; 1644 u_long recmark; 1645 1646 if (slp->ns_flag & SLP_GETSTREAM) 1647 panic("nfs getstream"); 1648 slp->ns_flag |= SLP_GETSTREAM; 1649 for (;;) { 1650 if (slp->ns_reclen == 0) { 1651 if (slp->ns_cc < NFSX_UNSIGNED) { 1652 slp->ns_flag &= ~SLP_GETSTREAM; 1653 return (0); 1654 } 1655 m = slp->ns_raw; 1656 if (m->m_len >= NFSX_UNSIGNED) { 1657 bcopy(mtod(m, caddr_t), (caddr_t)&recmark, NFSX_UNSIGNED); 1658 m->m_data += NFSX_UNSIGNED; 1659 m->m_len -= NFSX_UNSIGNED; 1660 } else { 1661 cp1 = (caddr_t)&recmark; 1662 cp2 = mtod(m, caddr_t); 1663 while (cp1 < ((caddr_t)&recmark) + NFSX_UNSIGNED) { 1664 while (m->m_len == 0) { 1665 m = m->m_next; 1666 cp2 = mtod(m, caddr_t); 1667 } 1668 *cp1++ = *cp2++; 1669 m->m_data++; 1670 m->m_len--; 1671 } 1672 } 1673 slp->ns_cc -= NFSX_UNSIGNED; 1674 slp->ns_reclen = ntohl(recmark) & ~0x80000000; 1675 if (slp->ns_reclen < NFS_MINPACKET || slp->ns_reclen > NFS_MAXPACKET) { 1676 slp->ns_flag &= ~SLP_GETSTREAM; 1677 return (EPERM); 1678 } 1679 } 1680 1681 /* 1682 * Now get the record part. 1683 */ 1684 if (slp->ns_cc == slp->ns_reclen) { 1685 recm = slp->ns_raw; 1686 slp->ns_raw = slp->ns_rawend = (struct mbuf *)0; 1687 slp->ns_cc = slp->ns_reclen = 0; 1688 } else if (slp->ns_cc > slp->ns_reclen) { 1689 len = 0; 1690 m = slp->ns_raw; 1691 om = (struct mbuf *)0; 1692 while (len < slp->ns_reclen) { 1693 if ((len + m->m_len) > slp->ns_reclen) { 1694 m2 = m_copym(m, 0, slp->ns_reclen - len, 1695 waitflag); 1696 if (m2) { 1697 if (om) { 1698 om->m_next = m2; 1699 recm = slp->ns_raw; 1700 } else 1701 recm = m2; 1702 m->m_data += slp->ns_reclen - len; 1703 m->m_len -= slp->ns_reclen - len; 1704 len = slp->ns_reclen; 1705 } else { 1706 slp->ns_flag &= ~SLP_GETSTREAM; 1707 return (EWOULDBLOCK); 1708 } 1709 } else if ((len + m->m_len) == slp->ns_reclen) { 1710 om = m; 1711 len += m->m_len; 1712 m = m->m_next; 1713 recm = slp->ns_raw; 1714 om->m_next = (struct mbuf *)0; 1715 } else { 1716 om = m; 1717 len += m->m_len; 1718 m = m->m_next; 1719 } 1720 } 1721 slp->ns_raw = m; 1722 slp->ns_cc -= len; 1723 slp->ns_reclen = 0; 1724 } else { 1725 slp->ns_flag &= ~SLP_GETSTREAM; 1726 return (0); 1727 } 1728 nfs_realign(recm, 10 * NFSX_UNSIGNED); 1729 if (slp->ns_recend) 1730 slp->ns_recend->m_nextpkt = recm; 1731 else 1732 slp->ns_rec = recm; 1733 slp->ns_recend = recm; 1734 } 1735 } 1736 1737 /* 1738 * Parse an RPC header. 1739 */ 1740 nfsrv_dorec(slp, nd) 1741 register struct nfssvc_sock *slp; 1742 register struct nfsd *nd; 1743 { 1744 register struct mbuf *m; 1745 int error; 1746 1747 if ((slp->ns_flag & SLP_VALID) == 0 || 1748 (m = slp->ns_rec) == (struct mbuf *)0) 1749 return (ENOBUFS); 1750 if (slp->ns_rec = m->m_nextpkt) 1751 m->m_nextpkt = (struct mbuf *)0; 1752 else 1753 slp->ns_recend = (struct mbuf *)0; 1754 if (m->m_type == MT_SONAME) { 1755 nd->nd_nam = m; 1756 nd->nd_md = nd->nd_mrep = m->m_next; 1757 m->m_next = (struct mbuf *)0; 1758 } else { 1759 nd->nd_nam = (struct mbuf *)0; 1760 nd->nd_md = nd->nd_mrep = m; 1761 } 1762 nd->nd_dpos = mtod(nd->nd_md, caddr_t); 1763 if (error = nfs_getreq(nd, TRUE)) { 1764 m_freem(nd->nd_nam); 1765 return (error); 1766 } 1767 return (0); 1768 } 1769 1770 /* 1771 * Parse an RPC request 1772 * - verify it 1773 * - fill in the cred struct. 1774 */ 1775 nfs_getreq(nd, has_header) 1776 register struct nfsd *nd; 1777 int has_header; 1778 { 1779 register int len, i; 1780 register u_long *tl; 1781 register long t1; 1782 struct uio uio; 1783 struct iovec iov; 1784 caddr_t dpos, cp2; 1785 u_long nfsvers, auth_type; 1786 int error = 0, nqnfs = 0; 1787 struct mbuf *mrep, *md; 1788 1789 mrep = nd->nd_mrep; 1790 md = nd->nd_md; 1791 dpos = nd->nd_dpos; 1792 if (has_header) { 1793 nfsm_dissect(tl, u_long *, 10*NFSX_UNSIGNED); 1794 nd->nd_retxid = *tl++; 1795 if (*tl++ != rpc_call) { 1796 m_freem(mrep); 1797 return (EBADRPC); 1798 } 1799 } else { 1800 nfsm_dissect(tl, u_long *, 8*NFSX_UNSIGNED); 1801 } 1802 nd->nd_repstat = 0; 1803 if (*tl++ != rpc_vers) { 1804 nd->nd_repstat = ERPCMISMATCH; 1805 nd->nd_procnum = NFSPROC_NOOP; 1806 return (0); 1807 } 1808 nfsvers = nfs_vers; 1809 if (*tl != nfs_prog) { 1810 if (*tl == nqnfs_prog) { 1811 nqnfs++; 1812 nfsvers = nqnfs_vers; 1813 } else { 1814 nd->nd_repstat = EPROGUNAVAIL; 1815 nd->nd_procnum = NFSPROC_NOOP; 1816 return (0); 1817 } 1818 } 1819 tl++; 1820 if (*tl++ != nfsvers) { 1821 nd->nd_repstat = EPROGMISMATCH; 1822 nd->nd_procnum = NFSPROC_NOOP; 1823 return (0); 1824 } 1825 nd->nd_procnum = fxdr_unsigned(u_long, *tl++); 1826 if (nd->nd_procnum == NFSPROC_NULL) 1827 return (0); 1828 if (nd->nd_procnum >= NFS_NPROCS || 1829 (!nqnfs && nd->nd_procnum > NFSPROC_STATFS) || 1830 (*tl != rpc_auth_unix && *tl != rpc_auth_kerb)) { 1831 nd->nd_repstat = EPROCUNAVAIL; 1832 nd->nd_procnum = NFSPROC_NOOP; 1833 return (0); 1834 } 1835 auth_type = *tl++; 1836 len = fxdr_unsigned(int, *tl++); 1837 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1838 m_freem(mrep); 1839 return (EBADRPC); 1840 } 1841 1842 /* 1843 * Handle auth_unix or auth_kerb. 1844 */ 1845 if (auth_type == rpc_auth_unix) { 1846 len = fxdr_unsigned(int, *++tl); 1847 if (len < 0 || len > NFS_MAXNAMLEN) { 1848 m_freem(mrep); 1849 return (EBADRPC); 1850 } 1851 nfsm_adv(nfsm_rndup(len)); 1852 nfsm_dissect(tl, u_long *, 3*NFSX_UNSIGNED); 1853 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++); 1854 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++); 1855 len = fxdr_unsigned(int, *tl); 1856 if (len < 0 || len > RPCAUTH_UNIXGIDS) { 1857 m_freem(mrep); 1858 return (EBADRPC); 1859 } 1860 nfsm_dissect(tl, u_long *, (len + 2)*NFSX_UNSIGNED); 1861 for (i = 1; i <= len; i++) 1862 if (i < NGROUPS) 1863 nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++); 1864 else 1865 tl++; 1866 nd->nd_cr.cr_ngroups = (len >= NGROUPS) ? NGROUPS : (len + 1); 1867 } else if (auth_type == rpc_auth_kerb) { 1868 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++); 1869 nd->nd_authlen = fxdr_unsigned(int, *tl); 1870 uio.uio_resid = nfsm_rndup(nd->nd_authlen); 1871 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) { 1872 m_freem(mrep); 1873 return (EBADRPC); 1874 } 1875 uio.uio_offset = 0; 1876 uio.uio_iov = &iov; 1877 uio.uio_iovcnt = 1; 1878 uio.uio_segflg = UIO_SYSSPACE; 1879 iov.iov_base = (caddr_t)nd->nd_authstr; 1880 iov.iov_len = RPCAUTH_MAXSIZ; 1881 nfsm_mtouio(&uio, uio.uio_resid); 1882 nfsm_dissect(tl, u_long *, 2 * NFSX_UNSIGNED); 1883 nd->nd_flag |= NFSD_NEEDAUTH; 1884 } 1885 1886 /* 1887 * Do we have any use for the verifier. 1888 * According to the "Remote Procedure Call Protocol Spec." it 1889 * should be AUTH_NULL, but some clients make it AUTH_UNIX? 1890 * For now, just skip over it 1891 */ 1892 len = fxdr_unsigned(int, *++tl); 1893 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1894 m_freem(mrep); 1895 return (EBADRPC); 1896 } 1897 if (len > 0) { 1898 nfsm_adv(nfsm_rndup(len)); 1899 } 1900 1901 /* 1902 * For nqnfs, get piggybacked lease request. 1903 */ 1904 if (nqnfs && nd->nd_procnum != NQNFSPROC_EVICTED) { 1905 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); 1906 nd->nd_nqlflag = fxdr_unsigned(int, *tl); 1907 if (nd->nd_nqlflag) { 1908 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); 1909 nd->nd_duration = fxdr_unsigned(int, *tl); 1910 } else 1911 nd->nd_duration = NQ_MINLEASE; 1912 } else { 1913 nd->nd_nqlflag = NQL_NOVAL; 1914 nd->nd_duration = NQ_MINLEASE; 1915 } 1916 nd->nd_md = md; 1917 nd->nd_dpos = dpos; 1918 return (0); 1919 nfsmout: 1920 return (error); 1921 } 1922 1923 /* 1924 * Search for a sleeping nfsd and wake it up. 1925 * SIDE EFFECT: If none found, set NFSD_CHECKSLP flag, so that one of the 1926 * running nfsds will go look for the work in the nfssvc_sock list. 1927 */ 1928 void 1929 nfsrv_wakenfsd(slp) 1930 struct nfssvc_sock *slp; 1931 { 1932 register struct nfsd *nd = nfsd_head.nd_next; 1933 1934 if ((slp->ns_flag & SLP_VALID) == 0) 1935 return; 1936 while (nd != (struct nfsd *)&nfsd_head) { 1937 if (nd->nd_flag & NFSD_WAITING) { 1938 nd->nd_flag &= ~NFSD_WAITING; 1939 if (nd->nd_slp) 1940 panic("nfsd wakeup"); 1941 slp->ns_sref++; 1942 nd->nd_slp = slp; 1943 wakeup((caddr_t)nd); 1944 return; 1945 } 1946 nd = nd->nd_next; 1947 } 1948 slp->ns_flag |= SLP_DOREC; 1949 nfsd_head.nd_flag |= NFSD_CHECKSLP; 1950 } 1951 1952 nfs_msg(p, server, msg) 1953 struct proc *p; 1954 char *server, *msg; 1955 { 1956 tpr_t tpr; 1957 1958 if (p) 1959 tpr = tprintf_open(p); 1960 else 1961 tpr = NULL; 1962 tprintf(tpr, "nfs server %s: %s\n", server, msg); 1963 tprintf_close(tpr); 1964 } 1965