1 /* $OpenBSD: nfs_subs.c,v 1.106 2009/09/02 18:20:54 thib Exp $ */ 2 /* $NetBSD: nfs_subs.c,v 1.27.4.3 1996/07/08 20:34:24 jtc Exp $ */ 3 4 /* 5 * Copyright (c) 1989, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Rick Macklem at The University of Guelph. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)nfs_subs.c 8.8 (Berkeley) 5/22/95 36 */ 37 38 39 /* 40 * These functions support the macros and help fiddle mbuf chains for 41 * the nfs op functions. They do things like create the rpc header and 42 * copy data between mbuf chains and uio lists. 43 */ 44 #include <sys/param.h> 45 #include <sys/proc.h> 46 #include <sys/systm.h> 47 #include <sys/kernel.h> 48 #include <sys/mount.h> 49 #include <sys/vnode.h> 50 #include <sys/namei.h> 51 #include <sys/mbuf.h> 52 #include <sys/socket.h> 53 #include <sys/socketvar.h> 54 #include <sys/stat.h> 55 #include <sys/pool.h> 56 #include <sys/time.h> 57 58 #include <uvm/uvm_extern.h> 59 60 #include <nfs/rpcv2.h> 61 #include <nfs/nfsproto.h> 62 #include <nfs/nfsnode.h> 63 #include <nfs/nfs.h> 64 #include <nfs/xdr_subs.h> 65 #include <nfs/nfsm_subs.h> 66 #include <nfs/nfsmount.h> 67 #include <nfs/nfs_var.h> 68 69 #include <miscfs/specfs/specdev.h> 70 71 #include <netinet/in.h> 72 73 #include <dev/rndvar.h> 74 #include <crypto/idgen.h> 75 76 int nfs_attrtimeo(struct nfsnode *np); 77 78 /* 79 * Data items converted to xdr at startup, since they are constant 80 * This is kinda hokey, but may save a little time doing byte swaps 81 */ 82 u_int32_t nfs_xdrneg1; 83 u_int32_t rpc_call, rpc_vers, rpc_reply, rpc_msgdenied, rpc_autherr, 84 rpc_mismatch, rpc_auth_unix, rpc_msgaccepted; 85 u_int32_t nfs_prog, nfs_true, nfs_false; 86 87 /* And other global data */ 88 nfstype nfsv2_type[9] = { NFNON, NFREG, NFDIR, NFBLK, NFCHR, NFLNK, NFNON, 89 NFCHR, NFNON }; 90 nfstype nfsv3_type[9] = { NFNON, NFREG, NFDIR, NFBLK, NFCHR, NFLNK, NFSOCK, 91 NFFIFO, NFNON }; 92 enum vtype nv2tov_type[8] = { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VNON, VNON }; 93 enum vtype nv3tov_type[8]={ VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO }; 94 int nfs_ticks; 95 struct nfsstats nfsstats; 96 97 /* 98 * Mapping of old NFS Version 2 RPC numbers to generic numbers. 99 */ 100 int nfsv3_procid[NFS_NPROCS] = { 101 NFSPROC_NULL, 102 NFSPROC_GETATTR, 103 NFSPROC_SETATTR, 104 NFSPROC_NOOP, 105 NFSPROC_LOOKUP, 106 NFSPROC_READLINK, 107 NFSPROC_READ, 108 NFSPROC_NOOP, 109 NFSPROC_WRITE, 110 NFSPROC_CREATE, 111 NFSPROC_REMOVE, 112 NFSPROC_RENAME, 113 NFSPROC_LINK, 114 NFSPROC_SYMLINK, 115 NFSPROC_MKDIR, 116 NFSPROC_RMDIR, 117 NFSPROC_READDIR, 118 NFSPROC_FSSTAT, 119 NFSPROC_NOOP, 120 NFSPROC_NOOP, 121 NFSPROC_NOOP, 122 NFSPROC_NOOP, 123 NFSPROC_NOOP 124 }; 125 126 /* 127 * and the reverse mapping from generic to Version 2 procedure numbers 128 */ 129 int nfsv2_procid[NFS_NPROCS] = { 130 NFSV2PROC_NULL, 131 NFSV2PROC_GETATTR, 132 NFSV2PROC_SETATTR, 133 NFSV2PROC_LOOKUP, 134 NFSV2PROC_NOOP, 135 NFSV2PROC_READLINK, 136 NFSV2PROC_READ, 137 NFSV2PROC_WRITE, 138 NFSV2PROC_CREATE, 139 NFSV2PROC_MKDIR, 140 NFSV2PROC_SYMLINK, 141 NFSV2PROC_CREATE, 142 NFSV2PROC_REMOVE, 143 NFSV2PROC_RMDIR, 144 NFSV2PROC_RENAME, 145 NFSV2PROC_LINK, 146 NFSV2PROC_READDIR, 147 NFSV2PROC_NOOP, 148 NFSV2PROC_STATFS, 149 NFSV2PROC_NOOP, 150 NFSV2PROC_NOOP, 151 NFSV2PROC_NOOP, 152 NFSV2PROC_NOOP 153 }; 154 155 /* 156 * Maps errno values to nfs error numbers. 157 * Use NFSERR_IO as the catch all for ones not specifically defined in 158 * RFC 1094. 159 */ 160 static u_char nfsrv_v2errmap[] = { 161 NFSERR_PERM, NFSERR_NOENT, NFSERR_IO, NFSERR_IO, NFSERR_IO, 162 NFSERR_NXIO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 163 NFSERR_IO, NFSERR_IO, NFSERR_ACCES, NFSERR_IO, NFSERR_IO, 164 NFSERR_IO, NFSERR_EXIST, NFSERR_IO, NFSERR_NODEV, NFSERR_NOTDIR, 165 NFSERR_ISDIR, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 166 NFSERR_IO, NFSERR_FBIG, NFSERR_NOSPC, NFSERR_IO, NFSERR_ROFS, 167 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 168 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 169 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 170 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 171 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 172 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 173 NFSERR_IO, NFSERR_IO, NFSERR_NAMETOL, NFSERR_IO, NFSERR_IO, 174 NFSERR_NOTEMPTY, NFSERR_IO, NFSERR_IO, NFSERR_DQUOT, NFSERR_STALE 175 /* Everything after this maps to NFSERR_IO, so far */ 176 }; 177 178 /* 179 * Maps errno values to nfs error numbers. 180 * Although it is not obvious whether or not NFS clients really care if 181 * a returned error value is in the specified list for the procedure, the 182 * safest thing to do is filter them appropriately. For Version 2, the 183 * X/Open XNFS document is the only specification that defines error values 184 * for each RPC (The RFC simply lists all possible error values for all RPCs), 185 * so I have decided to not do this for Version 2. 186 * The first entry is the default error return and the rest are the valid 187 * errors for that RPC in increasing numeric order. 188 */ 189 static short nfsv3err_null[] = { 190 0, 191 0, 192 }; 193 194 static short nfsv3err_getattr[] = { 195 NFSERR_IO, 196 NFSERR_IO, 197 NFSERR_STALE, 198 NFSERR_BADHANDLE, 199 NFSERR_SERVERFAULT, 200 0, 201 }; 202 203 static short nfsv3err_setattr[] = { 204 NFSERR_IO, 205 NFSERR_PERM, 206 NFSERR_IO, 207 NFSERR_ACCES, 208 NFSERR_INVAL, 209 NFSERR_NOSPC, 210 NFSERR_ROFS, 211 NFSERR_DQUOT, 212 NFSERR_STALE, 213 NFSERR_BADHANDLE, 214 NFSERR_NOT_SYNC, 215 NFSERR_SERVERFAULT, 216 0, 217 }; 218 219 static short nfsv3err_lookup[] = { 220 NFSERR_IO, 221 NFSERR_NOENT, 222 NFSERR_IO, 223 NFSERR_ACCES, 224 NFSERR_NOTDIR, 225 NFSERR_NAMETOL, 226 NFSERR_STALE, 227 NFSERR_BADHANDLE, 228 NFSERR_SERVERFAULT, 229 0, 230 }; 231 232 static short nfsv3err_access[] = { 233 NFSERR_IO, 234 NFSERR_IO, 235 NFSERR_STALE, 236 NFSERR_BADHANDLE, 237 NFSERR_SERVERFAULT, 238 0, 239 }; 240 241 static short nfsv3err_readlink[] = { 242 NFSERR_IO, 243 NFSERR_IO, 244 NFSERR_ACCES, 245 NFSERR_INVAL, 246 NFSERR_STALE, 247 NFSERR_BADHANDLE, 248 NFSERR_NOTSUPP, 249 NFSERR_SERVERFAULT, 250 0, 251 }; 252 253 static short nfsv3err_read[] = { 254 NFSERR_IO, 255 NFSERR_IO, 256 NFSERR_NXIO, 257 NFSERR_ACCES, 258 NFSERR_INVAL, 259 NFSERR_STALE, 260 NFSERR_BADHANDLE, 261 NFSERR_SERVERFAULT, 262 0, 263 }; 264 265 static short nfsv3err_write[] = { 266 NFSERR_IO, 267 NFSERR_IO, 268 NFSERR_ACCES, 269 NFSERR_INVAL, 270 NFSERR_FBIG, 271 NFSERR_NOSPC, 272 NFSERR_ROFS, 273 NFSERR_DQUOT, 274 NFSERR_STALE, 275 NFSERR_BADHANDLE, 276 NFSERR_SERVERFAULT, 277 0, 278 }; 279 280 static short nfsv3err_create[] = { 281 NFSERR_IO, 282 NFSERR_IO, 283 NFSERR_ACCES, 284 NFSERR_EXIST, 285 NFSERR_NOTDIR, 286 NFSERR_NOSPC, 287 NFSERR_ROFS, 288 NFSERR_NAMETOL, 289 NFSERR_DQUOT, 290 NFSERR_STALE, 291 NFSERR_BADHANDLE, 292 NFSERR_NOTSUPP, 293 NFSERR_SERVERFAULT, 294 0, 295 }; 296 297 static short nfsv3err_mkdir[] = { 298 NFSERR_IO, 299 NFSERR_IO, 300 NFSERR_ACCES, 301 NFSERR_EXIST, 302 NFSERR_NOTDIR, 303 NFSERR_NOSPC, 304 NFSERR_ROFS, 305 NFSERR_NAMETOL, 306 NFSERR_DQUOT, 307 NFSERR_STALE, 308 NFSERR_BADHANDLE, 309 NFSERR_NOTSUPP, 310 NFSERR_SERVERFAULT, 311 0, 312 }; 313 314 static short nfsv3err_symlink[] = { 315 NFSERR_IO, 316 NFSERR_IO, 317 NFSERR_ACCES, 318 NFSERR_EXIST, 319 NFSERR_NOTDIR, 320 NFSERR_NOSPC, 321 NFSERR_ROFS, 322 NFSERR_NAMETOL, 323 NFSERR_DQUOT, 324 NFSERR_STALE, 325 NFSERR_BADHANDLE, 326 NFSERR_NOTSUPP, 327 NFSERR_SERVERFAULT, 328 0, 329 }; 330 331 static short nfsv3err_mknod[] = { 332 NFSERR_IO, 333 NFSERR_IO, 334 NFSERR_ACCES, 335 NFSERR_EXIST, 336 NFSERR_NOTDIR, 337 NFSERR_NOSPC, 338 NFSERR_ROFS, 339 NFSERR_NAMETOL, 340 NFSERR_DQUOT, 341 NFSERR_STALE, 342 NFSERR_BADHANDLE, 343 NFSERR_NOTSUPP, 344 NFSERR_SERVERFAULT, 345 NFSERR_BADTYPE, 346 0, 347 }; 348 349 static short nfsv3err_remove[] = { 350 NFSERR_IO, 351 NFSERR_NOENT, 352 NFSERR_IO, 353 NFSERR_ACCES, 354 NFSERR_NOTDIR, 355 NFSERR_ROFS, 356 NFSERR_NAMETOL, 357 NFSERR_STALE, 358 NFSERR_BADHANDLE, 359 NFSERR_SERVERFAULT, 360 0, 361 }; 362 363 static short nfsv3err_rmdir[] = { 364 NFSERR_IO, 365 NFSERR_NOENT, 366 NFSERR_IO, 367 NFSERR_ACCES, 368 NFSERR_EXIST, 369 NFSERR_NOTDIR, 370 NFSERR_INVAL, 371 NFSERR_ROFS, 372 NFSERR_NAMETOL, 373 NFSERR_NOTEMPTY, 374 NFSERR_STALE, 375 NFSERR_BADHANDLE, 376 NFSERR_NOTSUPP, 377 NFSERR_SERVERFAULT, 378 0, 379 }; 380 381 static short nfsv3err_rename[] = { 382 NFSERR_IO, 383 NFSERR_NOENT, 384 NFSERR_IO, 385 NFSERR_ACCES, 386 NFSERR_EXIST, 387 NFSERR_XDEV, 388 NFSERR_NOTDIR, 389 NFSERR_ISDIR, 390 NFSERR_INVAL, 391 NFSERR_NOSPC, 392 NFSERR_ROFS, 393 NFSERR_MLINK, 394 NFSERR_NAMETOL, 395 NFSERR_NOTEMPTY, 396 NFSERR_DQUOT, 397 NFSERR_STALE, 398 NFSERR_BADHANDLE, 399 NFSERR_NOTSUPP, 400 NFSERR_SERVERFAULT, 401 0, 402 }; 403 404 static short nfsv3err_link[] = { 405 NFSERR_IO, 406 NFSERR_IO, 407 NFSERR_ACCES, 408 NFSERR_EXIST, 409 NFSERR_XDEV, 410 NFSERR_NOTDIR, 411 NFSERR_INVAL, 412 NFSERR_NOSPC, 413 NFSERR_ROFS, 414 NFSERR_MLINK, 415 NFSERR_NAMETOL, 416 NFSERR_DQUOT, 417 NFSERR_STALE, 418 NFSERR_BADHANDLE, 419 NFSERR_NOTSUPP, 420 NFSERR_SERVERFAULT, 421 0, 422 }; 423 424 static short nfsv3err_readdir[] = { 425 NFSERR_IO, 426 NFSERR_IO, 427 NFSERR_ACCES, 428 NFSERR_NOTDIR, 429 NFSERR_STALE, 430 NFSERR_BADHANDLE, 431 NFSERR_BAD_COOKIE, 432 NFSERR_TOOSMALL, 433 NFSERR_SERVERFAULT, 434 0, 435 }; 436 437 static short nfsv3err_readdirplus[] = { 438 NFSERR_IO, 439 NFSERR_IO, 440 NFSERR_ACCES, 441 NFSERR_NOTDIR, 442 NFSERR_STALE, 443 NFSERR_BADHANDLE, 444 NFSERR_BAD_COOKIE, 445 NFSERR_NOTSUPP, 446 NFSERR_TOOSMALL, 447 NFSERR_SERVERFAULT, 448 0, 449 }; 450 451 static short nfsv3err_fsstat[] = { 452 NFSERR_IO, 453 NFSERR_IO, 454 NFSERR_STALE, 455 NFSERR_BADHANDLE, 456 NFSERR_SERVERFAULT, 457 0, 458 }; 459 460 static short nfsv3err_fsinfo[] = { 461 NFSERR_STALE, 462 NFSERR_STALE, 463 NFSERR_BADHANDLE, 464 NFSERR_SERVERFAULT, 465 0, 466 }; 467 468 static short nfsv3err_pathconf[] = { 469 NFSERR_STALE, 470 NFSERR_STALE, 471 NFSERR_BADHANDLE, 472 NFSERR_SERVERFAULT, 473 0, 474 }; 475 476 static short nfsv3err_commit[] = { 477 NFSERR_IO, 478 NFSERR_IO, 479 NFSERR_STALE, 480 NFSERR_BADHANDLE, 481 NFSERR_SERVERFAULT, 482 0, 483 }; 484 485 static short *nfsrv_v3errmap[] = { 486 nfsv3err_null, 487 nfsv3err_getattr, 488 nfsv3err_setattr, 489 nfsv3err_lookup, 490 nfsv3err_access, 491 nfsv3err_readlink, 492 nfsv3err_read, 493 nfsv3err_write, 494 nfsv3err_create, 495 nfsv3err_mkdir, 496 nfsv3err_symlink, 497 nfsv3err_mknod, 498 nfsv3err_remove, 499 nfsv3err_rmdir, 500 nfsv3err_rename, 501 nfsv3err_link, 502 nfsv3err_readdir, 503 nfsv3err_readdirplus, 504 nfsv3err_fsstat, 505 nfsv3err_fsinfo, 506 nfsv3err_pathconf, 507 nfsv3err_commit, 508 }; 509 510 struct pool nfsreqpl; 511 512 /* 513 * Create the header for an rpc request packet 514 * The hsiz is the size of the rest of the nfs request header. 515 * (just used to decide if a cluster is a good idea) 516 */ 517 struct mbuf * 518 nfsm_reqhead(hsiz) 519 int hsiz; 520 { 521 struct mbuf *mb; 522 523 MGET(mb, M_WAIT, MT_DATA); 524 if (hsiz > MLEN) 525 MCLGET(mb, M_WAIT); 526 mb->m_len = 0; 527 528 /* Finally, return values */ 529 return (mb); 530 } 531 532 /* 533 * Return an unpredictable XID in XDR form. 534 */ 535 u_int32_t 536 nfs_get_xid(void) 537 { 538 static struct idgen32_ctx nfs_xid_ctx; 539 static int called = 0; 540 541 if (!called) { 542 called = 1; 543 idgen32_init(&nfs_xid_ctx); 544 } 545 return (txdr_unsigned(idgen32(&nfs_xid_ctx))); 546 } 547 548 /* 549 * Build the RPC header and fill in the authorization info. 550 * Right now we are pretty centric around RPCAUTH_UNIX, in the 551 * future, this function will need some love to be able to handle 552 * other authorization methods, such as Kerberos. 553 */ 554 void 555 nfsm_rpchead(struct nfsreq *req, struct ucred *cr, int auth_type) 556 { 557 struct mbuf *mb; 558 u_int32_t *tl; 559 int i, authsiz, auth_len, ngroups; 560 561 KASSERT(auth_type == RPCAUTH_UNIX); 562 563 /* 564 * RPCAUTH_UNIX fits in an hdr mbuf, in the future other 565 * authorization methods need to figure out their own sizes 566 * and allocate and chain mbuf's accorindgly. 567 */ 568 mb = req->r_mreq; 569 570 /* 571 * We need to start out by finding how big the authorization cred 572 * and verifer are for the auth_type, to be able to correctly 573 * align the mbuf header/chain. 574 */ 575 switch (auth_type) { 576 case RPCAUTH_UNIX: 577 /* 578 * In the RPCAUTH_UNIX case, the size is the static 579 * part as shown in RFC1831 + the number of groups, 580 * RPCAUTH_UNIX has a zero verifer. 581 */ 582 if (cr->cr_ngroups > req->r_nmp->nm_numgrps) 583 ngroups = req->r_nmp->nm_numgrps; 584 else 585 ngroups = cr->cr_ngroups; 586 587 auth_len = (ngroups << 2) + 5 * NFSX_UNSIGNED; 588 authsiz = nfsm_rndup(auth_len); 589 /* The authorization size + the size of the static part */ 590 MH_ALIGN(mb, authsiz + 10 * NFSX_UNSIGNED); 591 break; 592 } 593 594 mb->m_len = 0; 595 596 /* First the RPC header. */ 597 tl = nfsm_build(&mb, 6 * NFSX_UNSIGNED); 598 599 /* Get a new (non-zero) xid */ 600 *tl++ = req->r_xid = nfs_get_xid(); 601 *tl++ = rpc_call; 602 *tl++ = rpc_vers; 603 *tl++ = nfs_prog; 604 if (ISSET(req->r_nmp->nm_flag, NFSMNT_NFSV3)) { 605 *tl++ = txdr_unsigned(NFS_VER3); 606 *tl = txdr_unsigned(req->r_procnum); 607 } else { 608 *tl++ = txdr_unsigned(NFS_VER2); 609 *tl = txdr_unsigned(nfsv2_procid[req->r_procnum]); 610 } 611 612 /* The Authorization cred and its verifier */ 613 switch (auth_type) { 614 case RPCAUTH_UNIX: 615 tl = nfsm_build(&mb, auth_len + 4 * NFSX_UNSIGNED); 616 *tl++ = txdr_unsigned(RPCAUTH_UNIX); 617 *tl++ = txdr_unsigned(authsiz); 618 619 /* The authorization cred */ 620 *tl++ = 0; /* stamp */ 621 *tl++ = 0; /* NULL hostname */ 622 *tl++ = txdr_unsigned(cr->cr_uid); 623 *tl++ = txdr_unsigned(cr->cr_gid); 624 *tl++ = txdr_unsigned(ngroups); 625 for (i = 0; i < ngroups; i++) 626 *tl++ = txdr_unsigned(cr->cr_groups[i]); 627 /* The authorization verifier */ 628 *tl++ = txdr_unsigned(RPCAUTH_NULL); 629 *tl = 0; 630 break; 631 } 632 633 mb->m_pkthdr.len += authsiz + 10 * NFSX_UNSIGNED; 634 mb->m_pkthdr.rcvif = NULL; 635 } 636 637 /* 638 * copies mbuf chain to the uio scatter/gather list 639 */ 640 int 641 nfsm_mbuftouio(mrep, uiop, siz, dpos) 642 struct mbuf **mrep; 643 struct uio *uiop; 644 int siz; 645 caddr_t *dpos; 646 { 647 char *mbufcp, *uiocp; 648 int xfer, left, len; 649 struct mbuf *mp; 650 long uiosiz, rem; 651 int error = 0; 652 653 mp = *mrep; 654 mbufcp = *dpos; 655 len = mtod(mp, caddr_t)+mp->m_len-mbufcp; 656 rem = nfsm_padlen(siz); 657 while (siz > 0) { 658 if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL) 659 return (EFBIG); 660 left = uiop->uio_iov->iov_len; 661 uiocp = uiop->uio_iov->iov_base; 662 if (left > siz) 663 left = siz; 664 uiosiz = left; 665 while (left > 0) { 666 while (len == 0) { 667 mp = mp->m_next; 668 if (mp == NULL) 669 return (EBADRPC); 670 mbufcp = mtod(mp, caddr_t); 671 len = mp->m_len; 672 } 673 xfer = (left > len) ? len : left; 674 if (uiop->uio_segflg == UIO_SYSSPACE) 675 bcopy(mbufcp, uiocp, xfer); 676 else 677 copyout(mbufcp, uiocp, xfer); 678 left -= xfer; 679 len -= xfer; 680 mbufcp += xfer; 681 uiocp += xfer; 682 uiop->uio_offset += xfer; 683 uiop->uio_resid -= xfer; 684 } 685 if (uiop->uio_iov->iov_len <= siz) { 686 uiop->uio_iovcnt--; 687 uiop->uio_iov++; 688 } else { 689 uiop->uio_iov->iov_base = 690 (char *)uiop->uio_iov->iov_base + uiosiz; 691 uiop->uio_iov->iov_len -= uiosiz; 692 } 693 siz -= uiosiz; 694 } 695 *dpos = mbufcp; 696 *mrep = mp; 697 if (rem > 0) { 698 if (len < rem) 699 error = nfs_adv(mrep, dpos, rem, len); 700 else 701 *dpos += rem; 702 } 703 return (error); 704 } 705 706 /* 707 * Copy a uio scatter/gather list to an mbuf chain. 708 */ 709 void 710 nfsm_uiotombuf(struct mbuf **mp, struct uio *uiop, size_t len) 711 { 712 struct mbuf *mb, *mb2; 713 size_t xfer, pad; 714 715 mb = *mp; 716 717 pad = nfsm_padlen(len); 718 719 /* XXX -- the following should be done by the caller */ 720 uiop->uio_resid = len; 721 uiop->uio_rw = UIO_WRITE; 722 723 while (len) { 724 xfer = min(len, M_TRAILINGSPACE(mb)); 725 uiomove(mb_offset(mb), xfer, uiop); 726 mb->m_len += xfer; 727 len -= xfer; 728 if (len > 0) { 729 MGET(mb2, M_WAIT, MT_DATA); 730 if (len > MLEN) 731 MCLGET(mb2, M_WAIT); 732 mb2->m_len = 0; 733 mb->m_next = mb2; 734 mb = mb2; 735 } 736 } 737 738 if (pad > 0) { 739 if (pad > M_TRAILINGSPACE(mb)) { 740 MGET(mb2, M_WAIT, MT_DATA); 741 mb2->m_len = 0; 742 mb->m_next = mb2; 743 mb = mb2; 744 } 745 bzero(mb_offset(mb), pad); 746 mb->m_len += pad; 747 } 748 749 *mp = mb; 750 } 751 752 /* 753 * Copy a buffer to an mbuf chain 754 */ 755 void 756 nfsm_buftombuf(struct mbuf **mp, void *buf, size_t len) 757 { 758 struct iovec iov; 759 struct uio io; 760 761 iov.iov_base = buf; 762 iov.iov_len = len; 763 764 io.uio_iov = &iov; 765 io.uio_iovcnt = 1; 766 io.uio_resid = len; 767 io.uio_segflg = UIO_SYSSPACE; 768 io.uio_rw = UIO_WRITE; 769 770 nfsm_uiotombuf(mp, &io, len); 771 } 772 773 /* 774 * Copy a string to an mbuf chain 775 */ 776 void 777 nfsm_strtombuf(struct mbuf **mp, void *str, size_t len) 778 { 779 struct iovec iov[2]; 780 struct uio io; 781 uint32_t strlen; 782 783 strlen = txdr_unsigned(len); 784 785 iov[0].iov_base = &strlen; 786 iov[0].iov_len = sizeof(uint32_t); 787 iov[1].iov_base = str; 788 iov[1].iov_len = len; 789 790 io.uio_iov = iov; 791 io.uio_iovcnt = 2; 792 io.uio_resid = sizeof(uint32_t) + len; 793 io.uio_segflg = UIO_SYSSPACE; 794 io.uio_rw = UIO_WRITE; 795 796 nfsm_uiotombuf(mp, &io, io.uio_resid); 797 } 798 799 /* 800 * Help break down an mbuf chain by setting the first siz bytes contiguous 801 * pointed to by returned val. 802 * This is used by the macros nfsm_dissect and nfsm_dissecton for tough 803 * cases. (The macros use the vars. dpos and dpos2) 804 */ 805 int 806 nfsm_disct(mdp, dposp, siz, left, cp2) 807 struct mbuf **mdp; 808 caddr_t *dposp; 809 int siz; 810 int left; 811 caddr_t *cp2; 812 { 813 struct mbuf *mp, *mp2; 814 int siz2, xfer; 815 caddr_t p; 816 817 mp = *mdp; 818 while (left == 0) { 819 *mdp = mp = mp->m_next; 820 if (mp == NULL) 821 return (EBADRPC); 822 left = mp->m_len; 823 *dposp = mtod(mp, caddr_t); 824 } 825 if (left >= siz) { 826 *cp2 = *dposp; 827 *dposp += siz; 828 } else if (mp->m_next == NULL) { 829 return (EBADRPC); 830 } else if (siz > MHLEN) { 831 panic("nfs S too big"); 832 } else { 833 MGET(mp2, M_WAIT, MT_DATA); 834 mp2->m_next = mp->m_next; 835 mp->m_next = mp2; 836 mp->m_len -= left; 837 mp = mp2; 838 *cp2 = p = mtod(mp, caddr_t); 839 bcopy(*dposp, p, left); /* Copy what was left */ 840 siz2 = siz-left; 841 p += left; 842 mp2 = mp->m_next; 843 /* Loop around copying up the siz2 bytes */ 844 while (siz2 > 0) { 845 if (mp2 == NULL) 846 return (EBADRPC); 847 xfer = (siz2 > mp2->m_len) ? mp2->m_len : siz2; 848 if (xfer > 0) { 849 bcopy(mtod(mp2, caddr_t), p, xfer); 850 mp2->m_data += xfer; 851 mp2->m_len -= xfer; 852 p += xfer; 853 siz2 -= xfer; 854 } 855 if (siz2 > 0) 856 mp2 = mp2->m_next; 857 } 858 mp->m_len = siz; 859 *mdp = mp2; 860 *dposp = mtod(mp2, caddr_t); 861 } 862 return (0); 863 } 864 865 /* 866 * Advance the position in the mbuf chain. 867 */ 868 int 869 nfs_adv(mdp, dposp, offs, left) 870 struct mbuf **mdp; 871 caddr_t *dposp; 872 int offs; 873 int left; 874 { 875 struct mbuf *m; 876 int s; 877 878 m = *mdp; 879 s = left; 880 while (s < offs) { 881 offs -= s; 882 m = m->m_next; 883 if (m == NULL) 884 return (EBADRPC); 885 s = m->m_len; 886 } 887 *mdp = m; 888 *dposp = mtod(m, caddr_t)+offs; 889 return (0); 890 } 891 892 /* 893 * Called once to initialize data structures... 894 */ 895 void 896 nfs_init() 897 { 898 rpc_vers = txdr_unsigned(RPC_VER2); 899 rpc_call = txdr_unsigned(RPC_CALL); 900 rpc_reply = txdr_unsigned(RPC_REPLY); 901 rpc_msgdenied = txdr_unsigned(RPC_MSGDENIED); 902 rpc_msgaccepted = txdr_unsigned(RPC_MSGACCEPTED); 903 rpc_mismatch = txdr_unsigned(RPC_MISMATCH); 904 rpc_autherr = txdr_unsigned(RPC_AUTHERR); 905 rpc_auth_unix = txdr_unsigned(RPCAUTH_UNIX); 906 nfs_prog = txdr_unsigned(NFS_PROG); 907 nfs_true = txdr_unsigned(1); 908 nfs_false = txdr_unsigned(0); 909 nfs_xdrneg1 = txdr_unsigned(-1); 910 nfs_ticks = (hz * NFS_TICKINTVL + 500) / 1000; 911 if (nfs_ticks < 1) 912 nfs_ticks = 1; 913 #ifdef NFSSERVER 914 nfsrv_init(0); /* Init server data structures */ 915 nfsrv_initcache(); /* Init the server request cache */ 916 #endif /* NFSSERVER */ 917 918 pool_init(&nfsreqpl, sizeof(struct nfsreq), 0, 0, 0, "nfsreqpl", 919 &pool_allocator_nointr); 920 } 921 922 #ifdef NFSCLIENT 923 int 924 nfs_vfs_init(struct vfsconf *vfsp) 925 { 926 extern struct pool nfs_node_pool; 927 928 TAILQ_INIT(&nfs_bufq); 929 930 pool_init(&nfs_node_pool, sizeof(struct nfsnode), 0, 0, 0, 931 "nfsnodepl", NULL); 932 933 return (0); 934 } 935 936 /* 937 * Attribute cache routines. 938 * nfs_loadattrcache() - loads or updates the cache contents from attributes 939 * that are on the mbuf list 940 * nfs_getattrcache() - returns valid attributes if found in cache, returns 941 * error otherwise 942 */ 943 944 /* 945 * Load the attribute cache (that lives in the nfsnode entry) with 946 * the values on the mbuf list and 947 * Iff vap not NULL 948 * copy the attributes to *vaper 949 */ 950 int 951 nfs_loadattrcache(vpp, mdp, dposp, vaper) 952 struct vnode **vpp; 953 struct mbuf **mdp; 954 caddr_t *dposp; 955 struct vattr *vaper; 956 { 957 struct vnode *vp = *vpp; 958 struct vattr *vap; 959 struct nfs_fattr *fp; 960 extern int (**spec_nfsv2nodeop_p)(void *); 961 struct nfsnode *np; 962 int32_t t1; 963 caddr_t cp2; 964 int error = 0; 965 int32_t rdev; 966 struct mbuf *md; 967 enum vtype vtyp; 968 mode_t vmode; 969 struct timespec mtime; 970 struct vnode *nvp; 971 int v3 = NFS_ISV3(vp); 972 uid_t uid; 973 gid_t gid; 974 975 md = *mdp; 976 t1 = (mtod(md, caddr_t) + md->m_len) - *dposp; 977 error = nfsm_disct(mdp, dposp, NFSX_FATTR(v3), t1, &cp2); 978 if (error) 979 return (error); 980 fp = (struct nfs_fattr *)cp2; 981 if (v3) { 982 vtyp = nfsv3tov_type(fp->fa_type); 983 vmode = fxdr_unsigned(mode_t, fp->fa_mode); 984 rdev = makedev(fxdr_unsigned(u_int32_t, fp->fa3_rdev.specdata1), 985 fxdr_unsigned(u_int32_t, fp->fa3_rdev.specdata2)); 986 fxdr_nfsv3time(&fp->fa3_mtime, &mtime); 987 } else { 988 vtyp = nfsv2tov_type(fp->fa_type); 989 vmode = fxdr_unsigned(mode_t, fp->fa_mode); 990 if (vtyp == VNON || vtyp == VREG) 991 vtyp = IFTOVT(vmode); 992 rdev = fxdr_unsigned(int32_t, fp->fa2_rdev); 993 fxdr_nfsv2time(&fp->fa2_mtime, &mtime); 994 995 /* 996 * Really ugly NFSv2 kludge. 997 */ 998 if (vtyp == VCHR && rdev == 0xffffffff) 999 vtyp = VFIFO; 1000 } 1001 1002 /* 1003 * If v_type == VNON it is a new node, so fill in the v_type, 1004 * n_mtime fields. Check to see if it represents a special 1005 * device, and if so, check for a possible alias. Once the 1006 * correct vnode has been obtained, fill in the rest of the 1007 * information. 1008 */ 1009 np = VTONFS(vp); 1010 if (vp->v_type != vtyp) { 1011 vp->v_type = vtyp; 1012 if (vp->v_type == VFIFO) { 1013 #ifndef FIFO 1014 return (EOPNOTSUPP); 1015 #else 1016 extern int (**fifo_nfsv2nodeop_p)(void *); 1017 vp->v_op = fifo_nfsv2nodeop_p; 1018 #endif /* FIFO */ 1019 } 1020 if (vp->v_type == VCHR || vp->v_type == VBLK) { 1021 vp->v_op = spec_nfsv2nodeop_p; 1022 nvp = checkalias(vp, (dev_t)rdev, vp->v_mount); 1023 if (nvp) { 1024 /* 1025 * Discard unneeded vnode, but save its nfsnode. 1026 * Since the nfsnode does not have a lock, its 1027 * vnode lock has to be carried over. 1028 */ 1029 1030 nvp->v_data = vp->v_data; 1031 vp->v_data = NULL; 1032 vp->v_op = spec_vnodeop_p; 1033 vrele(vp); 1034 vgone(vp); 1035 /* 1036 * Reinitialize aliased node. 1037 */ 1038 np->n_vnode = nvp; 1039 *vpp = vp = nvp; 1040 } 1041 } 1042 np->n_mtime = mtime; 1043 } 1044 vap = &np->n_vattr; 1045 vap->va_type = vtyp; 1046 vap->va_rdev = (dev_t)rdev; 1047 vap->va_mtime = mtime; 1048 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 1049 1050 uid = fxdr_unsigned(uid_t, fp->fa_uid); 1051 gid = fxdr_unsigned(gid_t, fp->fa_gid); 1052 /* Invalidate access cache if uid, gid or mode changed. */ 1053 if (np->n_accstamp != -1 && 1054 (gid != vap->va_gid || uid != vap->va_uid || 1055 (vmode & 07777) != vap->va_mode)) 1056 np->n_accstamp = -1; 1057 1058 vap->va_mode = (vmode & 07777); 1059 1060 switch (vtyp) { 1061 case VBLK: 1062 vap->va_blocksize = BLKDEV_IOSIZE; 1063 break; 1064 case VCHR: 1065 vap->va_blocksize = MAXBSIZE; 1066 break; 1067 default: 1068 vap->va_blocksize = v3 ? vp->v_mount->mnt_stat.f_iosize : 1069 fxdr_unsigned(int32_t, fp->fa2_blocksize); 1070 break; 1071 } 1072 if (v3) { 1073 vap->va_nlink = fxdr_unsigned(nlink_t, fp->fa_nlink); 1074 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid); 1075 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid); 1076 vap->va_size = fxdr_hyper(&fp->fa3_size); 1077 vap->va_bytes = fxdr_hyper(&fp->fa3_used); 1078 vap->va_fileid = fxdr_unsigned(int32_t, 1079 fp->fa3_fileid.nfsuquad[1]); 1080 fxdr_nfsv3time(&fp->fa3_atime, &vap->va_atime); 1081 fxdr_nfsv3time(&fp->fa3_ctime, &vap->va_ctime); 1082 vap->va_flags = 0; 1083 vap->va_filerev = 0; 1084 } else { 1085 vap->va_nlink = fxdr_unsigned(nlink_t, fp->fa_nlink); 1086 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid); 1087 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid); 1088 vap->va_size = fxdr_unsigned(u_int32_t, fp->fa2_size); 1089 vap->va_bytes = 1090 (u_quad_t)fxdr_unsigned(int32_t, fp->fa2_blocks) * 1091 NFS_FABLKSIZE; 1092 vap->va_fileid = fxdr_unsigned(int32_t, fp->fa2_fileid); 1093 fxdr_nfsv2time(&fp->fa2_atime, &vap->va_atime); 1094 vap->va_flags = 0; 1095 vap->va_ctime.tv_sec = fxdr_unsigned(u_int32_t, 1096 fp->fa2_ctime.nfsv2_sec); 1097 vap->va_ctime.tv_nsec = 0; 1098 vap->va_gen = fxdr_unsigned(u_int32_t,fp->fa2_ctime.nfsv2_usec); 1099 vap->va_filerev = 0; 1100 } 1101 1102 if (vap->va_size != np->n_size) { 1103 if (vap->va_type == VREG) { 1104 if (np->n_flag & NMODIFIED) { 1105 if (vap->va_size < np->n_size) 1106 vap->va_size = np->n_size; 1107 else 1108 np->n_size = vap->va_size; 1109 } else 1110 np->n_size = vap->va_size; 1111 uvm_vnp_setsize(vp, np->n_size); 1112 } else 1113 np->n_size = vap->va_size; 1114 } 1115 np->n_attrstamp = time_second; 1116 if (vaper != NULL) { 1117 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(*vap)); 1118 if (np->n_flag & NCHG) { 1119 if (np->n_flag & NACC) 1120 vaper->va_atime = np->n_atim; 1121 if (np->n_flag & NUPD) 1122 vaper->va_mtime = np->n_mtim; 1123 } 1124 } 1125 return (0); 1126 } 1127 1128 int 1129 nfs_attrtimeo(np) 1130 struct nfsnode *np; 1131 { 1132 struct vnode *vp = np->n_vnode; 1133 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1134 int tenthage = (time_second - np->n_mtime.tv_sec) / 10; 1135 int minto, maxto; 1136 1137 if (vp->v_type == VDIR) { 1138 maxto = nmp->nm_acdirmax; 1139 minto = nmp->nm_acdirmin; 1140 } 1141 else { 1142 maxto = nmp->nm_acregmax; 1143 minto = nmp->nm_acregmin; 1144 } 1145 1146 if (np->n_flag & NMODIFIED || tenthage < minto) 1147 return minto; 1148 else if (tenthage < maxto) 1149 return tenthage; 1150 else 1151 return maxto; 1152 } 1153 1154 /* 1155 * Check the time stamp 1156 * If the cache is valid, copy contents to *vap and return 0 1157 * otherwise return an error 1158 */ 1159 int 1160 nfs_getattrcache(vp, vaper) 1161 struct vnode *vp; 1162 struct vattr *vaper; 1163 { 1164 struct nfsnode *np = VTONFS(vp); 1165 struct vattr *vap; 1166 1167 if (np->n_attrstamp == 0 || 1168 (time_second - np->n_attrstamp) >= nfs_attrtimeo(np)) { 1169 nfsstats.attrcache_misses++; 1170 return (ENOENT); 1171 } 1172 nfsstats.attrcache_hits++; 1173 vap = &np->n_vattr; 1174 if (vap->va_size != np->n_size) { 1175 if (vap->va_type == VREG) { 1176 if (np->n_flag & NMODIFIED) { 1177 if (vap->va_size < np->n_size) 1178 vap->va_size = np->n_size; 1179 else 1180 np->n_size = vap->va_size; 1181 } else 1182 np->n_size = vap->va_size; 1183 uvm_vnp_setsize(vp, np->n_size); 1184 } else 1185 np->n_size = vap->va_size; 1186 } 1187 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr)); 1188 if (np->n_flag & NCHG) { 1189 if (np->n_flag & NACC) 1190 vaper->va_atime = np->n_atim; 1191 if (np->n_flag & NUPD) 1192 vaper->va_mtime = np->n_mtim; 1193 } 1194 return (0); 1195 } 1196 #endif /* NFSCLIENT */ 1197 1198 /* 1199 * Set up nameidata for a lookup() call and do it 1200 */ 1201 int 1202 nfs_namei(ndp, fhp, len, slp, nam, mdp, dposp, retdirp, p) 1203 struct nameidata *ndp; 1204 fhandle_t *fhp; 1205 int len; 1206 struct nfssvc_sock *slp; 1207 struct mbuf *nam; 1208 struct mbuf **mdp; 1209 caddr_t *dposp; 1210 struct vnode **retdirp; 1211 struct proc *p; 1212 { 1213 int i, rem; 1214 struct mbuf *md; 1215 char *fromcp, *tocp; 1216 struct vnode *dp; 1217 int error, rdonly; 1218 struct componentname *cnp = &ndp->ni_cnd; 1219 1220 *retdirp = NULL; 1221 cnp->cn_pnbuf = pool_get(&namei_pool, PR_WAITOK); 1222 /* 1223 * Copy the name from the mbuf list to ndp->ni_pnbuf 1224 * and set the various ndp fields appropriately. 1225 */ 1226 fromcp = *dposp; 1227 tocp = cnp->cn_pnbuf; 1228 md = *mdp; 1229 rem = mtod(md, caddr_t) + md->m_len - fromcp; 1230 cnp->cn_hash = 0; 1231 for (i = 0; i < len; i++) { 1232 while (rem == 0) { 1233 md = md->m_next; 1234 if (md == NULL) { 1235 error = EBADRPC; 1236 goto out; 1237 } 1238 fromcp = mtod(md, caddr_t); 1239 rem = md->m_len; 1240 } 1241 if (*fromcp == '\0' || *fromcp == '/') { 1242 error = EACCES; 1243 goto out; 1244 } 1245 cnp->cn_hash += (u_char)*fromcp; 1246 *tocp++ = *fromcp++; 1247 rem--; 1248 } 1249 *tocp = '\0'; 1250 *mdp = md; 1251 *dposp = fromcp; 1252 len = nfsm_padlen(len); 1253 if (len > 0) { 1254 if (rem >= len) 1255 *dposp += len; 1256 else if ((error = nfs_adv(mdp, dposp, len, rem)) != 0) 1257 goto out; 1258 } 1259 ndp->ni_pathlen = tocp - cnp->cn_pnbuf; 1260 cnp->cn_nameptr = cnp->cn_pnbuf; 1261 /* 1262 * Extract and set starting directory. 1263 */ 1264 error = nfsrv_fhtovp(fhp, 0, &dp, ndp->ni_cnd.cn_cred, slp, 1265 nam, &rdonly); 1266 if (error) 1267 goto out; 1268 if (dp->v_type != VDIR) { 1269 vrele(dp); 1270 error = ENOTDIR; 1271 goto out; 1272 } 1273 vref(dp); 1274 *retdirp = dp; 1275 ndp->ni_startdir = dp; 1276 if (rdonly) 1277 cnp->cn_flags |= (NOCROSSMOUNT | RDONLY); 1278 else 1279 cnp->cn_flags |= NOCROSSMOUNT; 1280 /* 1281 * And call lookup() to do the real work 1282 */ 1283 cnp->cn_proc = p; 1284 error = lookup(ndp); 1285 if (error) 1286 goto out; 1287 /* 1288 * Check for encountering a symbolic link 1289 */ 1290 if (cnp->cn_flags & ISSYMLINK) { 1291 if ((cnp->cn_flags & LOCKPARENT) && ndp->ni_pathlen == 1) 1292 vput(ndp->ni_dvp); 1293 else 1294 vrele(ndp->ni_dvp); 1295 vput(ndp->ni_vp); 1296 ndp->ni_vp = NULL; 1297 error = EINVAL; 1298 goto out; 1299 } 1300 /* 1301 * Check for saved name request 1302 */ 1303 if (cnp->cn_flags & (SAVENAME | SAVESTART)) { 1304 cnp->cn_flags |= HASBUF; 1305 return (0); 1306 } 1307 out: 1308 pool_put(&namei_pool, cnp->cn_pnbuf); 1309 return (error); 1310 } 1311 1312 /* 1313 * A fiddled version of m_adj() that ensures null fill to a long 1314 * boundary and only trims off the back end 1315 */ 1316 void 1317 nfsm_adj(mp, len, nul) 1318 struct mbuf *mp; 1319 int len; 1320 int nul; 1321 { 1322 struct mbuf *m; 1323 int count, i; 1324 char *cp; 1325 1326 /* 1327 * Trim from tail. Scan the mbuf chain, 1328 * calculating its length and finding the last mbuf. 1329 * If the adjustment only affects this mbuf, then just 1330 * adjust and return. Otherwise, rescan and truncate 1331 * after the remaining size. 1332 */ 1333 count = 0; 1334 m = mp; 1335 for (;;) { 1336 count += m->m_len; 1337 if (m->m_next == NULL) 1338 break; 1339 m = m->m_next; 1340 } 1341 if (m->m_len > len) { 1342 m->m_len -= len; 1343 if (nul > 0) { 1344 cp = mtod(m, caddr_t)+m->m_len-nul; 1345 for (i = 0; i < nul; i++) 1346 *cp++ = '\0'; 1347 } 1348 return; 1349 } 1350 count -= len; 1351 if (count < 0) 1352 count = 0; 1353 /* 1354 * Correct length for chain is "count". 1355 * Find the mbuf with last data, adjust its length, 1356 * and toss data from remaining mbufs on chain. 1357 */ 1358 for (m = mp; m; m = m->m_next) { 1359 if (m->m_len >= count) { 1360 m->m_len = count; 1361 if (nul > 0) { 1362 cp = mtod(m, caddr_t)+m->m_len-nul; 1363 for (i = 0; i < nul; i++) 1364 *cp++ = '\0'; 1365 } 1366 break; 1367 } 1368 count -= m->m_len; 1369 } 1370 for (m = m->m_next;m;m = m->m_next) 1371 m->m_len = 0; 1372 } 1373 1374 /* 1375 * Make these functions instead of macros, so that the kernel text size 1376 * doesn't get too big... 1377 */ 1378 void 1379 nfsm_srvwcc(struct nfsrv_descript *nfsd, int before_ret, 1380 struct vattr *before_vap, int after_ret, struct vattr *after_vap, 1381 struct nfsm_info *info) 1382 { 1383 u_int32_t *tl; 1384 1385 if (before_ret) { 1386 tl = nfsm_build(&info->nmi_mb, NFSX_UNSIGNED); 1387 *tl = nfs_false; 1388 } else { 1389 tl = nfsm_build(&info->nmi_mb, 7 * NFSX_UNSIGNED); 1390 *tl++ = nfs_true; 1391 txdr_hyper(before_vap->va_size, tl); 1392 tl += 2; 1393 txdr_nfsv3time(&(before_vap->va_mtime), tl); 1394 tl += 2; 1395 txdr_nfsv3time(&(before_vap->va_ctime), tl); 1396 } 1397 nfsm_srvpostop_attr(nfsd, after_ret, after_vap, info); 1398 } 1399 1400 void 1401 nfsm_srvpostop_attr(struct nfsrv_descript *nfsd, int after_ret, 1402 struct vattr *after_vap, struct nfsm_info *info) 1403 { 1404 u_int32_t *tl; 1405 struct nfs_fattr *fp; 1406 1407 if (after_ret) { 1408 tl = nfsm_build(&info->nmi_mb, NFSX_UNSIGNED); 1409 *tl = nfs_false; 1410 } else { 1411 tl = nfsm_build(&info->nmi_mb, NFSX_UNSIGNED + NFSX_V3FATTR); 1412 *tl++ = nfs_true; 1413 fp = (struct nfs_fattr *)tl; 1414 nfsm_srvfattr(nfsd, after_vap, fp); 1415 } 1416 } 1417 1418 void 1419 nfsm_srvfattr(nfsd, vap, fp) 1420 struct nfsrv_descript *nfsd; 1421 struct vattr *vap; 1422 struct nfs_fattr *fp; 1423 { 1424 1425 fp->fa_nlink = txdr_unsigned(vap->va_nlink); 1426 fp->fa_uid = txdr_unsigned(vap->va_uid); 1427 fp->fa_gid = txdr_unsigned(vap->va_gid); 1428 if (nfsd->nd_flag & ND_NFSV3) { 1429 fp->fa_type = vtonfsv3_type(vap->va_type); 1430 fp->fa_mode = vtonfsv3_mode(vap->va_mode); 1431 txdr_hyper(vap->va_size, &fp->fa3_size); 1432 txdr_hyper(vap->va_bytes, &fp->fa3_used); 1433 fp->fa3_rdev.specdata1 = txdr_unsigned(major(vap->va_rdev)); 1434 fp->fa3_rdev.specdata2 = txdr_unsigned(minor(vap->va_rdev)); 1435 fp->fa3_fsid.nfsuquad[0] = 0; 1436 fp->fa3_fsid.nfsuquad[1] = txdr_unsigned(vap->va_fsid); 1437 fp->fa3_fileid.nfsuquad[0] = 0; 1438 fp->fa3_fileid.nfsuquad[1] = txdr_unsigned(vap->va_fileid); 1439 txdr_nfsv3time(&vap->va_atime, &fp->fa3_atime); 1440 txdr_nfsv3time(&vap->va_mtime, &fp->fa3_mtime); 1441 txdr_nfsv3time(&vap->va_ctime, &fp->fa3_ctime); 1442 } else { 1443 fp->fa_type = vtonfsv2_type(vap->va_type); 1444 fp->fa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1445 fp->fa2_size = txdr_unsigned(vap->va_size); 1446 fp->fa2_blocksize = txdr_unsigned(vap->va_blocksize); 1447 if (vap->va_type == VFIFO) 1448 fp->fa2_rdev = 0xffffffff; 1449 else 1450 fp->fa2_rdev = txdr_unsigned(vap->va_rdev); 1451 fp->fa2_blocks = txdr_unsigned(vap->va_bytes / NFS_FABLKSIZE); 1452 fp->fa2_fsid = txdr_unsigned(vap->va_fsid); 1453 fp->fa2_fileid = txdr_unsigned(vap->va_fileid); 1454 txdr_nfsv2time(&vap->va_atime, &fp->fa2_atime); 1455 txdr_nfsv2time(&vap->va_mtime, &fp->fa2_mtime); 1456 txdr_nfsv2time(&vap->va_ctime, &fp->fa2_ctime); 1457 } 1458 } 1459 1460 /* 1461 * nfsrv_fhtovp() - convert a fh to a vnode ptr (optionally locked) 1462 * - look up fsid in mount list (if not found ret error) 1463 * - get vp and export rights by calling VFS_FHTOVP() and VFS_CHECKEXP() 1464 * - if cred->cr_uid == 0 or MNT_EXPORTANON set it to credanon 1465 * - if not lockflag unlock it with VOP_UNLOCK() 1466 */ 1467 int 1468 nfsrv_fhtovp(fhp, lockflag, vpp, cred, slp, nam, rdonlyp) 1469 fhandle_t *fhp; 1470 int lockflag; 1471 struct vnode **vpp; 1472 struct ucred *cred; 1473 struct nfssvc_sock *slp; 1474 struct mbuf *nam; 1475 int *rdonlyp; 1476 { 1477 struct proc *p = curproc; /* XXX */ 1478 struct mount *mp; 1479 int i; 1480 struct ucred *credanon; 1481 int error, exflags; 1482 struct sockaddr_in *saddr; 1483 1484 *vpp = NULL; 1485 mp = vfs_getvfs(&fhp->fh_fsid); 1486 1487 if (!mp) 1488 return (ESTALE); 1489 error = VFS_CHECKEXP(mp, nam, &exflags, &credanon); 1490 if (error) 1491 return (error); 1492 error = VFS_FHTOVP(mp, &fhp->fh_fid, vpp); 1493 if (error) 1494 return (error); 1495 1496 saddr = mtod(nam, struct sockaddr_in *); 1497 if (saddr->sin_family == AF_INET && 1498 (ntohs(saddr->sin_port) >= IPPORT_RESERVED || 1499 (slp->ns_so->so_type == SOCK_STREAM && ntohs(saddr->sin_port) == 20))) { 1500 vput(*vpp); 1501 return (NFSERR_AUTHERR | AUTH_TOOWEAK); 1502 } 1503 1504 /* Check/setup credentials. */ 1505 if (cred->cr_uid == 0 || (exflags & MNT_EXPORTANON)) { 1506 cred->cr_uid = credanon->cr_uid; 1507 cred->cr_gid = credanon->cr_gid; 1508 for (i = 0; i < credanon->cr_ngroups && i < NGROUPS; i++) 1509 cred->cr_groups[i] = credanon->cr_groups[i]; 1510 cred->cr_ngroups = i; 1511 } 1512 if (exflags & MNT_EXRDONLY) 1513 *rdonlyp = 1; 1514 else 1515 *rdonlyp = 0; 1516 if (!lockflag) 1517 VOP_UNLOCK(*vpp, 0, p); 1518 1519 return (0); 1520 } 1521 1522 /* 1523 * This function compares two net addresses by family and returns non zero 1524 * if they are the same host, or if there is any doubt it returns 0. 1525 * The AF_INET family is handled as a special case so that address mbufs 1526 * don't need to be saved to store "struct in_addr", which is only 4 bytes. 1527 */ 1528 int 1529 netaddr_match(family, haddr, nam) 1530 int family; 1531 union nethostaddr *haddr; 1532 struct mbuf *nam; 1533 { 1534 struct sockaddr_in *inetaddr; 1535 1536 switch (family) { 1537 case AF_INET: 1538 inetaddr = mtod(nam, struct sockaddr_in *); 1539 if (inetaddr->sin_family == AF_INET && 1540 inetaddr->sin_addr.s_addr == haddr->had_inetaddr) 1541 return (1); 1542 break; 1543 default: 1544 break; 1545 }; 1546 return (0); 1547 } 1548 1549 /* 1550 * The write verifier has changed (probably due to a server reboot), so all 1551 * B_NEEDCOMMIT blocks will have to be written again. Since they are on the 1552 * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT 1553 * flag. Once done the new write verifier can be set for the mount point. 1554 */ 1555 void 1556 nfs_clearcommit(mp) 1557 struct mount *mp; 1558 { 1559 struct vnode *vp, *nvp; 1560 struct buf *bp, *nbp; 1561 int s; 1562 1563 s = splbio(); 1564 loop: 1565 for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nvp) { 1566 if (vp->v_mount != mp) /* Paranoia */ 1567 goto loop; 1568 nvp = LIST_NEXT(vp, v_mntvnodes); 1569 for (bp = LIST_FIRST(&vp->v_dirtyblkhd); bp != NULL; bp = nbp) { 1570 nbp = LIST_NEXT(bp, b_vnbufs); 1571 if ((bp->b_flags & (B_BUSY | B_DELWRI | B_NEEDCOMMIT)) 1572 == (B_DELWRI | B_NEEDCOMMIT)) 1573 bp->b_flags &= ~B_NEEDCOMMIT; 1574 } 1575 } 1576 splx(s); 1577 } 1578 1579 void 1580 nfs_merge_commit_ranges(vp) 1581 struct vnode *vp; 1582 { 1583 struct nfsnode *np = VTONFS(vp); 1584 1585 if (!(np->n_commitflags & NFS_COMMIT_PUSHED_VALID)) { 1586 np->n_pushedlo = np->n_pushlo; 1587 np->n_pushedhi = np->n_pushhi; 1588 np->n_commitflags |= NFS_COMMIT_PUSHED_VALID; 1589 } else { 1590 if (np->n_pushlo < np->n_pushedlo) 1591 np->n_pushedlo = np->n_pushlo; 1592 if (np->n_pushhi > np->n_pushedhi) 1593 np->n_pushedhi = np->n_pushhi; 1594 } 1595 1596 np->n_pushlo = np->n_pushhi = 0; 1597 np->n_commitflags &= ~NFS_COMMIT_PUSH_VALID; 1598 } 1599 1600 int 1601 nfs_in_committed_range(vp, bp) 1602 struct vnode *vp; 1603 struct buf *bp; 1604 { 1605 struct nfsnode *np = VTONFS(vp); 1606 off_t lo, hi; 1607 1608 if (!(np->n_commitflags & NFS_COMMIT_PUSHED_VALID)) 1609 return 0; 1610 lo = (off_t)bp->b_blkno * DEV_BSIZE; 1611 hi = lo + bp->b_dirtyend; 1612 1613 return (lo >= np->n_pushedlo && hi <= np->n_pushedhi); 1614 } 1615 1616 int 1617 nfs_in_tobecommitted_range(vp, bp) 1618 struct vnode *vp; 1619 struct buf *bp; 1620 { 1621 struct nfsnode *np = VTONFS(vp); 1622 off_t lo, hi; 1623 1624 if (!(np->n_commitflags & NFS_COMMIT_PUSH_VALID)) 1625 return 0; 1626 lo = (off_t)bp->b_blkno * DEV_BSIZE; 1627 hi = lo + bp->b_dirtyend; 1628 1629 return (lo >= np->n_pushlo && hi <= np->n_pushhi); 1630 } 1631 1632 void 1633 nfs_add_committed_range(vp, bp) 1634 struct vnode *vp; 1635 struct buf *bp; 1636 { 1637 struct nfsnode *np = VTONFS(vp); 1638 off_t lo, hi; 1639 1640 lo = (off_t)bp->b_blkno * DEV_BSIZE; 1641 hi = lo + bp->b_dirtyend; 1642 1643 if (!(np->n_commitflags & NFS_COMMIT_PUSHED_VALID)) { 1644 np->n_pushedlo = lo; 1645 np->n_pushedhi = hi; 1646 np->n_commitflags |= NFS_COMMIT_PUSHED_VALID; 1647 } else { 1648 if (hi > np->n_pushedhi) 1649 np->n_pushedhi = hi; 1650 if (lo < np->n_pushedlo) 1651 np->n_pushedlo = lo; 1652 } 1653 } 1654 1655 void 1656 nfs_del_committed_range(vp, bp) 1657 struct vnode *vp; 1658 struct buf *bp; 1659 { 1660 struct nfsnode *np = VTONFS(vp); 1661 off_t lo, hi; 1662 1663 if (!(np->n_commitflags & NFS_COMMIT_PUSHED_VALID)) 1664 return; 1665 1666 lo = (off_t)bp->b_blkno * DEV_BSIZE; 1667 hi = lo + bp->b_dirtyend; 1668 1669 if (lo > np->n_pushedhi || hi < np->n_pushedlo) 1670 return; 1671 if (lo <= np->n_pushedlo) 1672 np->n_pushedlo = hi; 1673 else if (hi >= np->n_pushedhi) 1674 np->n_pushedhi = lo; 1675 else { 1676 /* 1677 * XXX There's only one range. If the deleted range 1678 * is in the middle, pick the largest of the 1679 * contiguous ranges that it leaves. 1680 */ 1681 if ((np->n_pushedlo - lo) > (hi - np->n_pushedhi)) 1682 np->n_pushedhi = lo; 1683 else 1684 np->n_pushedlo = hi; 1685 } 1686 } 1687 1688 void 1689 nfs_add_tobecommitted_range(vp, bp) 1690 struct vnode *vp; 1691 struct buf *bp; 1692 { 1693 struct nfsnode *np = VTONFS(vp); 1694 off_t lo, hi; 1695 1696 lo = (off_t)bp->b_blkno * DEV_BSIZE; 1697 hi = lo + bp->b_dirtyend; 1698 1699 if (!(np->n_commitflags & NFS_COMMIT_PUSH_VALID)) { 1700 np->n_pushlo = lo; 1701 np->n_pushhi = hi; 1702 np->n_commitflags |= NFS_COMMIT_PUSH_VALID; 1703 } else { 1704 if (lo < np->n_pushlo) 1705 np->n_pushlo = lo; 1706 if (hi > np->n_pushhi) 1707 np->n_pushhi = hi; 1708 } 1709 } 1710 1711 void 1712 nfs_del_tobecommitted_range(vp, bp) 1713 struct vnode *vp; 1714 struct buf *bp; 1715 { 1716 struct nfsnode *np = VTONFS(vp); 1717 off_t lo, hi; 1718 1719 if (!(np->n_commitflags & NFS_COMMIT_PUSH_VALID)) 1720 return; 1721 1722 lo = (off_t)bp->b_blkno * DEV_BSIZE; 1723 hi = lo + bp->b_dirtyend; 1724 1725 if (lo > np->n_pushhi || hi < np->n_pushlo) 1726 return; 1727 1728 if (lo <= np->n_pushlo) 1729 np->n_pushlo = hi; 1730 else if (hi >= np->n_pushhi) 1731 np->n_pushhi = lo; 1732 else { 1733 /* 1734 * XXX There's only one range. If the deleted range 1735 * is in the middle, pick the largest of the 1736 * contiguous ranges that it leaves. 1737 */ 1738 if ((np->n_pushlo - lo) > (hi - np->n_pushhi)) 1739 np->n_pushhi = lo; 1740 else 1741 np->n_pushlo = hi; 1742 } 1743 } 1744 1745 /* 1746 * Map errnos to NFS error numbers. For Version 3 also filter out error 1747 * numbers not specified for the associated procedure. 1748 */ 1749 int 1750 nfsrv_errmap(nd, err) 1751 struct nfsrv_descript *nd; 1752 int err; 1753 { 1754 short *defaulterrp, *errp; 1755 1756 if (nd->nd_flag & ND_NFSV3) { 1757 if (nd->nd_procnum <= NFSPROC_COMMIT) { 1758 errp = defaulterrp = nfsrv_v3errmap[nd->nd_procnum]; 1759 while (*++errp) { 1760 if (*errp == err) 1761 return (err); 1762 else if (*errp > err) 1763 break; 1764 } 1765 return ((int)*defaulterrp); 1766 } else 1767 return (err & 0xffff); 1768 } 1769 if (err <= nitems(nfsrv_v2errmap)) 1770 return ((int)nfsrv_v2errmap[err - 1]); 1771 return (NFSERR_IO); 1772 } 1773 1774 /* 1775 * If full is non zero, set all fields, otherwise just set mode and time fields 1776 */ 1777 void 1778 nfsm_v3attrbuild(struct mbuf **mp, struct vattr *a, int full) 1779 { 1780 struct mbuf *mb; 1781 u_int32_t *tl; 1782 1783 mb = *mp; 1784 1785 if (a->va_mode != (mode_t)VNOVAL) { 1786 tl = nfsm_build(&mb, 2 * NFSX_UNSIGNED); 1787 *tl++ = nfs_true; 1788 *tl = txdr_unsigned(a->va_mode); 1789 } else { 1790 tl = nfsm_build(&mb, NFSX_UNSIGNED); 1791 *tl = nfs_false; 1792 } 1793 if (full && a->va_uid != (uid_t)VNOVAL) { 1794 tl = nfsm_build(&mb, 2 * NFSX_UNSIGNED); 1795 *tl++ = nfs_true; 1796 *tl = txdr_unsigned(a->va_uid); 1797 } else { 1798 tl = nfsm_build(&mb, NFSX_UNSIGNED); 1799 *tl = nfs_false; 1800 } 1801 if (full && a->va_gid != (gid_t)VNOVAL) { 1802 tl = nfsm_build(&mb, 2 * NFSX_UNSIGNED); 1803 *tl++ = nfs_true; 1804 *tl = txdr_unsigned((a)->va_gid); 1805 } else { 1806 tl = nfsm_build(&mb, NFSX_UNSIGNED); 1807 *tl = nfs_false; 1808 } 1809 if (full && a->va_size != VNOVAL) { 1810 tl = nfsm_build(&mb, 3 * NFSX_UNSIGNED); 1811 *tl++ = nfs_true; 1812 txdr_hyper(a->va_size, tl); 1813 } else { 1814 tl = nfsm_build(&mb, NFSX_UNSIGNED); 1815 *tl = nfs_false; 1816 } 1817 if (a->va_atime.tv_sec != VNOVAL) { 1818 if (a->va_atime.tv_sec != time_second) { 1819 tl = nfsm_build(&mb, 3 * NFSX_UNSIGNED); 1820 *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT); 1821 txdr_nfsv3time(&a->va_atime, tl); 1822 } else { 1823 tl = nfsm_build(&mb, NFSX_UNSIGNED); 1824 *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER); 1825 } 1826 } else { 1827 tl = nfsm_build(&mb, NFSX_UNSIGNED); 1828 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE); 1829 } 1830 if (a->va_mtime.tv_sec != VNOVAL) { 1831 if (a->va_mtime.tv_sec != time_second) { 1832 tl = nfsm_build(&mb, 3 * NFSX_UNSIGNED); 1833 *tl++ = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT); 1834 txdr_nfsv3time(&a->va_mtime, tl); 1835 } else { 1836 tl = nfsm_build(&mb, NFSX_UNSIGNED); 1837 *tl = txdr_unsigned(NFSV3SATTRTIME_TOSERVER); 1838 } 1839 } else { 1840 tl = nfsm_build(&mb, NFSX_UNSIGNED); 1841 *tl = txdr_unsigned(NFSV3SATTRTIME_DONTCHANGE); 1842 } 1843 1844 *mp = mb; 1845 } 1846 1847 /* 1848 * Ensure a contiguous buffer len bytes long 1849 */ 1850 void * 1851 nfsm_build(struct mbuf **mp, u_int len) 1852 { 1853 struct mbuf *mb, *mb2; 1854 caddr_t bpos; 1855 1856 mb = *mp; 1857 bpos = mb_offset(mb); 1858 1859 if (len > M_TRAILINGSPACE(mb)) { 1860 MGET(mb2, M_WAIT, MT_DATA); 1861 if (len > MLEN) 1862 panic("build > MLEN"); 1863 mb->m_next = mb2; 1864 mb = mb2; 1865 mb->m_len = 0; 1866 bpos = mtod(mb, caddr_t); 1867 } 1868 mb->m_len += len; 1869 1870 *mp = mb; 1871 1872 return (bpos); 1873 } 1874 1875 void 1876 nfsm_fhtom(struct nfsm_info *info, struct vnode *v, int v3) 1877 { 1878 struct nfsnode *n = VTONFS(v); 1879 1880 if (v3) { 1881 nfsm_strtombuf(&info->nmi_mb, n->n_fhp, n->n_fhsize); 1882 } else { 1883 nfsm_buftombuf(&info->nmi_mb, n->n_fhp, NFSX_V2FH); 1884 } 1885 } 1886 1887 void 1888 nfsm_srvfhtom(struct mbuf **mp, fhandle_t *f, int v3) 1889 { 1890 if (v3) { 1891 nfsm_strtombuf(mp, f, NFSX_V3FH); 1892 } else { 1893 nfsm_buftombuf(mp, f, NFSX_V2FH); 1894 } 1895 } 1896 1897 int 1898 nfsm_srvsattr(struct mbuf **mp, struct vattr *va, struct mbuf *mrep, 1899 caddr_t *dposp) 1900 { 1901 struct nfsm_info info; 1902 uint32_t *tl, t1; 1903 caddr_t cp2; 1904 int error = 0; 1905 1906 info.nmi_md = *mp; 1907 info.nmi_dpos = *dposp; 1908 1909 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1910 if (*tl == nfs_true) { 1911 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1912 va->va_mode = nfstov_mode(*tl); 1913 } 1914 1915 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1916 if (*tl == nfs_true) { 1917 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1918 va->va_uid = fxdr_unsigned(uid_t, *tl); 1919 } 1920 1921 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1922 if (*tl == nfs_true) { 1923 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1924 va->va_gid = fxdr_unsigned(gid_t, *tl); 1925 } 1926 1927 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1928 if (*tl == nfs_true) { 1929 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1930 va->va_size = fxdr_hyper(tl); 1931 } 1932 1933 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1934 switch (fxdr_unsigned(int, *tl)) { 1935 case NFSV3SATTRTIME_TOCLIENT: 1936 va->va_vaflags &= ~VA_UTIMES_NULL; 1937 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1938 fxdr_nfsv3time(tl, &va->va_atime); 1939 break; 1940 case NFSV3SATTRTIME_TOSERVER: 1941 getnanotime(&va->va_atime); 1942 break; 1943 }; 1944 1945 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1946 switch (fxdr_unsigned(int, *tl)) { 1947 case NFSV3SATTRTIME_TOCLIENT: 1948 va->va_vaflags &= ~VA_UTIMES_NULL; 1949 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1950 fxdr_nfsv3time(tl, &va->va_mtime); 1951 break; 1952 case NFSV3SATTRTIME_TOSERVER: 1953 getnanotime(&va->va_mtime); 1954 break; 1955 }; 1956 1957 *dposp = info.nmi_dpos; 1958 *mp = info.nmi_md; 1959 nfsmout: 1960 return (error); 1961 } 1962