1 /* 2 * Copyright (c) 1989 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Rick Macklem at The University of Guelph. 7 * 8 * Redistribution and use in source and binary forms are permitted 9 * provided that the above copyright notice and this paragraph are 10 * duplicated in all such forms and that any documentation, 11 * advertising materials, and other materials related to such 12 * distribution and use acknowledge that the software was developed 13 * by the University of California, Berkeley. The name of the 14 * University may not be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 19 * 20 * @(#)nfs_subs.c 7.10 (Berkeley) 10/29/89 21 */ 22 23 /* 24 * These functions support the macros and help fiddle mbuf chains for 25 * the nfs op functions. They do things like create the rpc header and 26 * copy data between mbuf chains and uio lists. 27 */ 28 #include "strings.h" 29 #include "param.h" 30 #include "systm.h" 31 #include "user.h" 32 #include "proc.h" 33 #include "mount.h" 34 #include "../ufs/dir.h" 35 #include "time.h" 36 #include "errno.h" 37 #include "kernel.h" 38 #include "malloc.h" 39 #include "mbuf.h" 40 #include "file.h" 41 #include "vnode.h" 42 #include "uio.h" 43 #include "namei.h" 44 #include "ucred.h" 45 #include "map.h" 46 #include "rpcv2.h" 47 #include "nfsv2.h" 48 #include "nfsnode.h" 49 #include "nfs.h" 50 #include "nfsiom.h" 51 #include "xdr_subs.h" 52 #include "nfsm_subs.h" 53 54 #define TRUE 1 55 #define FALSE 0 56 57 /* 58 * Data items converted to xdr at startup, since they are constant 59 * This is kinda hokey, but may save a little time doing byte swaps 60 */ 61 u_long nfs_procids[NFS_NPROCS]; 62 u_long nfs_xdrneg1; 63 u_long rpc_call, rpc_vers, rpc_reply, rpc_msgdenied, 64 rpc_mismatch, rpc_auth_unix, rpc_msgaccepted; 65 u_long nfs_vers, nfs_prog, nfs_true, nfs_false; 66 /* And other global data */ 67 static u_long *rpc_uidp = (u_long *)0; 68 static u_long nfs_xid = 1; 69 static char *rpc_unixauth; 70 extern long hostid; 71 extern enum vtype v_type[NFLNK+1]; 72 extern struct proc *nfs_iodwant[MAX_ASYNCDAEMON]; 73 extern struct map nfsmap[NFS_MSIZ]; 74 75 /* Function ret types */ 76 static char *nfs_unixauth(); 77 78 /* 79 * Maximum number of groups passed through to NFS server. 80 * For release 3.X systems, the maximum value is 8. 81 * For release 4.X systems, the maximum value is 10. 82 */ 83 int numgrps = 8; 84 85 /* 86 * Create the header for an rpc request packet 87 * The function nfs_unixauth() creates a unix style authorization string 88 * and returns a ptr to it. 89 * The hsiz is the size of the rest of the nfs request header. 90 * (just used to decide if a cluster is a good idea) 91 * nb: Note that the prog, vers and proc args are already in xdr byte order 92 */ 93 struct mbuf *nfsm_reqh(prog, vers, proc, cred, hsiz, bpos, mb, retxid) 94 u_long prog; 95 u_long vers; 96 u_long proc; 97 struct ucred *cred; 98 int hsiz; 99 caddr_t *bpos; 100 struct mbuf **mb; 101 u_long *retxid; 102 { 103 register struct mbuf *mreq, *m; 104 register u_long *p; 105 struct mbuf *m1; 106 char *ap; 107 int asiz, siz; 108 109 NFSMGETHDR(mreq); 110 asiz = (((cred->cr_ngroups > numgrps) ? numgrps : cred->cr_ngroups)<<2); 111 #ifdef FILLINHOST 112 asiz += nfsm_rndup(hostnamelen)+(9*NFSX_UNSIGNED); 113 #else 114 asiz += 9*NFSX_UNSIGNED; 115 #endif 116 117 /* If we need a lot, alloc a cluster ?? */ 118 if ((asiz+hsiz+RPC_SIZ) > MHLEN) 119 NFSMCLGET(mreq, M_WAIT); 120 mreq->m_len = NFSMSIZ(mreq); 121 siz = mreq->m_len; 122 m1 = mreq; 123 /* 124 * Alloc enough mbufs 125 * We do it now to avoid all sleeps after the call to nfs_unixauth() 126 */ 127 while ((asiz+RPC_SIZ) > siz) { 128 MGET(m, M_WAIT, MT_DATA); 129 m1->m_next = m; 130 m->m_len = MLEN; 131 siz += MLEN; 132 m1 = m; 133 } 134 p = mtod(mreq, u_long *); 135 *p++ = *retxid = txdr_unsigned(++nfs_xid); 136 *p++ = rpc_call; 137 *p++ = rpc_vers; 138 *p++ = prog; 139 *p++ = vers; 140 *p++ = proc; 141 142 /* Now we can call nfs_unixauth() and copy it in */ 143 ap = nfs_unixauth(cred); 144 m = mreq; 145 siz = m->m_len-RPC_SIZ; 146 if (asiz <= siz) { 147 bcopy(ap, (caddr_t)p, asiz); 148 m->m_len = asiz+RPC_SIZ; 149 } else { 150 bcopy(ap, (caddr_t)p, siz); 151 ap += siz; 152 asiz -= siz; 153 while (asiz > 0) { 154 siz = (asiz > MLEN) ? MLEN : asiz; 155 m = m->m_next; 156 bcopy(ap, mtod(m, caddr_t), siz); 157 m->m_len = siz; 158 asiz -= siz; 159 ap += siz; 160 } 161 } 162 163 /* Finally, return values */ 164 *mb = m; 165 *bpos = mtod(m, caddr_t)+m->m_len; 166 return (mreq); 167 } 168 169 /* 170 * copies mbuf chain to the uio scatter/gather list 171 */ 172 nfsm_mbuftouio(mrep, uiop, siz, dpos) 173 struct mbuf **mrep; 174 struct uio *uiop; 175 int siz; 176 caddr_t *dpos; 177 { 178 register int xfer, left, len; 179 register struct mbuf *mp; 180 register char *mbufcp, *uiocp; 181 long uiosiz, rem; 182 183 mp = *mrep; 184 mbufcp = *dpos; 185 len = mtod(mp, caddr_t)+mp->m_len-mbufcp; 186 rem = nfsm_rndup(siz)-siz; 187 while (siz > 0) { 188 if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL) 189 return(EFBIG); 190 left = uiop->uio_iov->iov_len; 191 uiocp = uiop->uio_iov->iov_base; 192 if (left > siz) 193 left = siz; 194 uiosiz = left; 195 while (left > 0) { 196 while (len == 0) { 197 mp = mp->m_next; 198 if (mp == NULL) 199 return (EBADRPC); 200 mbufcp = mtod(mp, caddr_t); 201 len = mp->m_len; 202 } 203 xfer = (left > len) ? len : left; 204 #ifdef notdef 205 /* Not Yet.. */ 206 if (uiop->uio_iov->iov_op != NULL) 207 (*(uiop->uio_iov->iov_op)) 208 (mbufcp, uiocp, xfer); 209 else 210 #endif 211 if (uiop->uio_segflg == UIO_SYSSPACE) 212 bcopy(mbufcp, uiocp, xfer); 213 else 214 copyout(mbufcp, uiocp, xfer); 215 left -= xfer; 216 len -= xfer; 217 mbufcp += xfer; 218 uiocp += xfer; 219 uiop->uio_resid -= xfer; 220 } 221 if (uiop->uio_iov->iov_len <= siz) { 222 uiop->uio_iovcnt--; 223 uiop->uio_iov++; 224 } else { 225 uiop->uio_iov->iov_base += uiosiz; 226 uiop->uio_iov->iov_len -= uiosiz; 227 } 228 siz -= uiosiz; 229 } 230 if (rem > 0) 231 mbufcp += rem; 232 *dpos = mbufcp; 233 *mrep = mp; 234 return(0); 235 } 236 237 /* 238 * copies a uio scatter/gather list to an mbuf chain... 239 */ 240 nfsm_uiotombuf(uiop, mq, siz, bpos) 241 register struct uio *uiop; 242 struct mbuf **mq; 243 int siz; 244 caddr_t *bpos; 245 { 246 register struct mbuf *mp; 247 struct mbuf *mp2; 248 long xfer, left, uiosiz, off; 249 int clflg; 250 int rem, len; 251 char *cp, *uiocp; 252 253 if (siz > MLEN) /* or should it >= MCLBYTES ?? */ 254 clflg = 1; 255 else 256 clflg = 0; 257 rem = nfsm_rndup(siz)-siz; 258 mp2 = *mq; 259 while (siz > 0) { 260 if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL) 261 return(EINVAL); 262 left = uiop->uio_iov->iov_len; 263 uiocp = uiop->uio_iov->iov_base; 264 if (left > siz) 265 left = siz; 266 uiosiz = left; 267 while (left > 0) { 268 MGET(mp, M_WAIT, MT_DATA); 269 if (clflg) 270 NFSMCLGET(mp, M_WAIT); 271 mp->m_len = NFSMSIZ(mp); 272 mp2->m_next = mp; 273 mp2 = mp; 274 xfer = (left > mp->m_len) ? mp->m_len : left; 275 #ifdef notdef 276 /* Not Yet.. */ 277 if (uiop->uio_iov->iov_op != NULL) 278 (*(uiop->uio_iov->iov_op)) 279 (uiocp, mtod(mp, caddr_t), xfer); 280 else 281 #endif 282 if (uiop->uio_segflg == UIO_SYSSPACE) 283 bcopy(uiocp, mtod(mp, caddr_t), xfer); 284 else 285 copyin(uiocp, mtod(mp, caddr_t), xfer); 286 len = mp->m_len; 287 mp->m_len = xfer; 288 left -= xfer; 289 uiocp += xfer; 290 uiop->uio_resid -= xfer; 291 } 292 if (uiop->uio_iov->iov_len <= siz) { 293 uiop->uio_iovcnt--; 294 uiop->uio_iov++; 295 } else { 296 uiop->uio_iov->iov_base += uiosiz; 297 uiop->uio_iov->iov_len -= uiosiz; 298 } 299 siz -= uiosiz; 300 } 301 if (rem > 0) { 302 if (rem > (len-mp->m_len)) { 303 MGET(mp, M_WAIT, MT_DATA); 304 mp->m_len = 0; 305 mp2->m_next = mp; 306 } 307 cp = mtod(mp, caddr_t)+mp->m_len; 308 for (left = 0; left < rem; left++) 309 *cp++ = '\0'; 310 mp->m_len += rem; 311 *bpos = cp; 312 } else 313 *bpos = mtod(mp, caddr_t)+mp->m_len; 314 *mq = mp; 315 return(0); 316 } 317 318 /* 319 * Help break down an mbuf chain by setting the first siz bytes contiguous 320 * pointed to by returned val. 321 * If Updateflg == True we can overwrite the first part of the mbuf data 322 * This is used by the macros nfsm_disect and nfsm_disecton for tough 323 * cases. (The macros use the vars. dpos and dpos2) 324 */ 325 nfsm_disct(mdp, dposp, siz, left, updateflg, cp2) 326 struct mbuf **mdp; 327 caddr_t *dposp; 328 int siz; 329 int left; 330 int updateflg; 331 caddr_t *cp2; 332 { 333 register struct mbuf *mp, *mp2; 334 register int siz2, xfer; 335 register caddr_t p; 336 caddr_t p2; 337 338 mp = *mdp; 339 while (left == 0) { 340 *mdp = mp = mp->m_next; 341 if (mp == NULL) 342 return(EBADRPC); 343 left = mp->m_len; 344 *dposp = mtod(mp, caddr_t); 345 } 346 if (left >= siz) { 347 *cp2 = *dposp; 348 *dposp += siz; 349 return(0); 350 } else if (mp->m_next == NULL) { 351 return(EBADRPC); 352 } else if (siz > MCLBYTES) { 353 panic("nfs S too big"); 354 } else { 355 /* Iff update, you can overwrite, else must alloc new mbuf */ 356 if (updateflg) { 357 NFSMINOFF(mp); 358 } else { 359 MGET(mp2, M_WAIT, MT_DATA); 360 mp2->m_next = mp->m_next; 361 mp->m_next = mp2; 362 mp->m_len -= left; 363 mp = mp2; 364 } 365 /* Alloc cluster iff we need it */ 366 if (!M_HASCL(mp) && siz > NFSMSIZ(mp)) { 367 NFSMCLGET(mp, M_WAIT); 368 if (!M_HASCL(mp)) 369 return(ENOBUFS); 370 } 371 *cp2 = p = mtod(mp, caddr_t); 372 bcopy(*dposp, p, left); /* Copy what was left */ 373 siz2 = siz-left; 374 p += left; 375 mp2 = mp->m_next; 376 /* Loop arround copying up the siz2 bytes */ 377 while (siz2 > 0) { 378 if (mp2 == NULL) 379 return (EBADRPC); 380 xfer = (siz2 > mp2->m_len) ? mp2->m_len : siz2; 381 bcopy(mtod(mp2, caddr_t), p, xfer); 382 NFSMADV(mp2, xfer); 383 mp2->m_len -= xfer; 384 siz2 -= xfer; 385 if (siz2 > 0) 386 mp2 = mp2->m_next; 387 } 388 mp->m_len = siz; 389 *mdp = mp2; 390 *dposp = mtod(mp2, caddr_t); 391 return (0); 392 } 393 } 394 395 /* 396 * Advance the position in the mbuf chain with/without freeing mbufs 397 */ 398 nfs_adv(mdp, dposp, offs, left) 399 struct mbuf **mdp; 400 caddr_t *dposp; 401 int offs; 402 int left; 403 { 404 register struct mbuf *m; 405 register int s; 406 407 m = *mdp; 408 s = left; 409 while (s < offs) { 410 offs -= s; 411 m = m->m_next; 412 if (m == NULL) 413 return(EBADRPC); 414 s = m->m_len; 415 } 416 *mdp = m; 417 *dposp = mtod(m, caddr_t)+offs; 418 return(0); 419 } 420 421 /* 422 * Copy a string into mbufs for the hard cases... 423 */ 424 nfsm_strtmbuf(mb, bpos, cp, siz) 425 struct mbuf **mb; 426 char **bpos; 427 char *cp; 428 long siz; 429 { 430 register struct mbuf *m1, *m2; 431 long left, xfer, len, tlen; 432 u_long *p; 433 int putsize; 434 435 putsize = 1; 436 m2 = *mb; 437 left = NFSMSIZ(m2)-m2->m_len; 438 if (left > 0) { 439 p = ((u_long *)(*bpos)); 440 *p++ = txdr_unsigned(siz); 441 putsize = 0; 442 left -= NFSX_UNSIGNED; 443 m2->m_len += NFSX_UNSIGNED; 444 if (left > 0) { 445 bcopy(cp, (caddr_t) p, left); 446 siz -= left; 447 cp += left; 448 m2->m_len += left; 449 left = 0; 450 } 451 } 452 /* Loop arround adding mbufs */ 453 while (siz > 0) { 454 MGET(m1, M_WAIT, MT_DATA); 455 if (siz > MLEN) 456 NFSMCLGET(m1, M_WAIT); 457 m1->m_len = NFSMSIZ(m1); 458 m2->m_next = m1; 459 m2 = m1; 460 p = mtod(m1, u_long *); 461 tlen = 0; 462 if (putsize) { 463 *p++ = txdr_unsigned(siz); 464 m1->m_len -= NFSX_UNSIGNED; 465 tlen = NFSX_UNSIGNED; 466 putsize = 0; 467 } 468 if (siz < m1->m_len) { 469 len = nfsm_rndup(siz); 470 xfer = siz; 471 if (xfer < len) 472 *(p+(xfer>>2)) = 0; 473 } else { 474 xfer = len = m1->m_len; 475 } 476 bcopy(cp, (caddr_t) p, xfer); 477 m1->m_len = len+tlen; 478 siz -= xfer; 479 cp += xfer; 480 } 481 *mb = m1; 482 *bpos = mtod(m1, caddr_t)+m1->m_len; 483 return(0); 484 } 485 486 /* 487 * Called once to initialize data structures... 488 */ 489 nfs_init() 490 { 491 register int i; 492 493 rpc_vers = txdr_unsigned(RPC_VER2); 494 rpc_call = txdr_unsigned(RPC_CALL); 495 rpc_reply = txdr_unsigned(RPC_REPLY); 496 rpc_msgdenied = txdr_unsigned(RPC_MSGDENIED); 497 rpc_msgaccepted = txdr_unsigned(RPC_MSGACCEPTED); 498 rpc_mismatch = txdr_unsigned(RPC_MISMATCH); 499 rpc_auth_unix = txdr_unsigned(RPCAUTH_UNIX); 500 nfs_vers = txdr_unsigned(NFS_VER2); 501 nfs_prog = txdr_unsigned(NFS_PROG); 502 nfs_true = txdr_unsigned(TRUE); 503 nfs_false = txdr_unsigned(FALSE); 504 /* Loop thru nfs procids */ 505 for (i = 0; i < NFS_NPROCS; i++) 506 nfs_procids[i] = txdr_unsigned(i); 507 /* Ensure async daemons disabled */ 508 for (i = 0; i < MAX_ASYNCDAEMON; i++) 509 nfs_iodwant[i] = (struct proc *)0; 510 v_type[0] = VNON; 511 v_type[1] = VREG; 512 v_type[2] = VDIR; 513 v_type[3] = VBLK; 514 v_type[4] = VCHR; 515 v_type[5] = VLNK; 516 nfs_xdrneg1 = txdr_unsigned(-1); 517 nfs_nhinit(); /* Init the nfsnode table */ 518 rminit(nfsmap, (long)NFS_MAPREG, (long)1, "nfs mapreg", NFS_MSIZ); 519 /* And start timer */ 520 nfs_timer(); 521 } 522 523 /* 524 * Fill in the rest of the rpc_unixauth and return it 525 */ 526 static char *nfs_unixauth(cr) 527 register struct ucred *cr; 528 { 529 register u_long *p; 530 register int i; 531 int ngr; 532 533 /* Maybe someday there should be a cache of AUTH_SHORT's */ 534 if ((p = rpc_uidp) == NULL) { 535 #ifdef FILLINHOST 536 i = nfsm_rndup(hostnamelen)+(19*NFSX_UNSIGNED); 537 #else 538 i = 19*NFSX_UNSIGNED; 539 #endif 540 MALLOC(p, u_long *, i, M_TEMP, M_WAITOK); 541 bzero((caddr_t)p, i); 542 rpc_unixauth = (caddr_t)p; 543 *p++ = txdr_unsigned(RPCAUTH_UNIX); 544 p++; /* Fill in size later */ 545 *p++ = hostid; 546 #ifdef FILLINHOST 547 *p++ = txdr_unsigned(hostnamelen); 548 i = nfsm_rndup(hostnamelen); 549 bcopy(hostname, (caddr_t)p, hostnamelen); 550 p += (i>>2); 551 #else 552 *p++ = 0; 553 #endif 554 rpc_uidp = p; 555 } 556 *p++ = txdr_unsigned(cr->cr_uid); 557 *p++ = txdr_unsigned(cr->cr_groups[0]); 558 ngr = (cr->cr_ngroups > numgrps) ? numgrps : cr->cr_ngroups; 559 *p++ = txdr_unsigned(ngr); 560 for (i = 0; i < ngr; i++) 561 *p++ = txdr_unsigned(cr->cr_groups[i]); 562 /* And add the AUTH_NULL */ 563 *p++ = 0; 564 *p = 0; 565 i = (((caddr_t)p)-rpc_unixauth)-12; 566 p = (u_long *)(rpc_unixauth+4); 567 *p = txdr_unsigned(i); 568 return(rpc_unixauth); 569 } 570 571 /* 572 * Attribute cache routines. 573 * nfs_loadattrcache() - loads or updates the cache contents from attributes 574 * that are on the mbuf list 575 * nfs_getattrcache() - returns valid attributes if found in cache, returns 576 * error otherwise 577 */ 578 579 /* 580 * Load the attribute cache (that lives in the nfsnode entry) with 581 * the values on the mbuf list and 582 * Iff vap not NULL 583 * copy the attributes to *vaper 584 */ 585 nfs_loadattrcache(vp, mdp, dposp, vaper) 586 register struct vnode *vp; 587 struct mbuf **mdp; 588 caddr_t *dposp; 589 struct vattr *vaper; 590 { 591 register struct vattr *vap; 592 register struct nfsv2_fattr *fp; 593 extern struct vnodeops spec_nfsv2nodeops; 594 nfsm_vars; 595 struct nfsnode *np; 596 enum vtype type; 597 dev_t rdev; 598 struct timeval mtime; 599 struct vnode *nvp; 600 601 md = *mdp; 602 dpos = *dposp; 603 t1 = (mtod(md, caddr_t)+md->m_len)-dpos; 604 if (error = nfsm_disct(&md, &dpos, NFSX_FATTR, t1, TRUE, &cp2)) 605 return (error); 606 fp = (struct nfsv2_fattr *)cp2; 607 type = nfstov_type(fp->fa_type); 608 rdev = fxdr_unsigned(dev_t, fp->fa_rdev); 609 fxdr_time(&fp->fa_mtime, &mtime); 610 /* 611 * If v_type == VNON it is a new node, so fill in the v_type, 612 * n_mtime fields. Check to see if it represents a special 613 * device, and if so, check for a possible alias. Once the 614 * correct vnode has been obtained, fill in the rest of the 615 * information. 616 */ 617 np = VTONFS(vp); 618 if (vp->v_type == VNON) { 619 vp->v_type = type; 620 if (vp->v_type == VCHR || vp->v_type == VBLK) { 621 vp->v_rdev = rdev; 622 vp->v_op = &spec_nfsv2nodeops; 623 if (nvp = checkalias(vp, vp->v_mount)) { 624 /* 625 * Reinitialize aliased node. 626 */ 627 np = VTONFS(nvp); 628 np->n_vnode = nvp; 629 np->n_flag = NLOCKED; 630 bcopy((caddr_t)&VTONFS(vp)->n_fh, 631 (caddr_t)&np->n_fh, NFSX_FH); 632 insque(np, nfs_hash(&np->n_fh)); 633 np->n_attrstamp = 0; 634 np->n_sillyrename = (struct sillyrename *)0; 635 /* 636 * Discard unneeded vnode 637 */ 638 vput(vp); 639 vp = nvp; 640 } 641 } 642 np->n_mtime = mtime.tv_sec; 643 } 644 vap = &np->n_vattr; 645 vap->va_type = type; 646 vap->va_mode = nfstov_mode(fp->fa_mode); 647 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink); 648 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid); 649 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid); 650 vap->va_size = fxdr_unsigned(u_long, fp->fa_size); 651 if ((np->n_flag & NMODIFIED) == 0 || vap->va_size > np->n_size) 652 np->n_size = vap->va_size; 653 vap->va_size1 = 0; /* OR -1 ?? */ 654 vap->va_blocksize = fxdr_unsigned(long, fp->fa_blocksize); 655 vap->va_rdev = rdev; 656 vap->va_bytes = fxdr_unsigned(long, fp->fa_blocks) * vap->va_blocksize; 657 vap->va_bytes1 = 0; 658 vap->va_fsid = fxdr_unsigned(long, fp->fa_fsid); 659 vap->va_fileid = fxdr_unsigned(long, fp->fa_fileid); 660 fxdr_time(&fp->fa_atime, &vap->va_atime); 661 fxdr_time(&fp->fa_ctime, &vap->va_ctime); 662 vap->va_mtime = mtime; 663 vap->va_gen = 0; 664 vap->va_flags = 0; 665 np->n_attrstamp = time.tv_sec; 666 *dposp = dpos; 667 *mdp = md; 668 if (vaper != NULL) { 669 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(*vap)); 670 if ((np->n_flag & NMODIFIED) && (np->n_size > vap->va_size)) 671 vaper->va_size = np->n_size; 672 } 673 return (0); 674 } 675 676 /* 677 * Check the time stamp 678 * If the cache is valid, copy contents to *vap and return 0 679 * otherwise return an error 680 */ 681 nfs_getattrcache(vp, vap) 682 register struct vnode *vp; 683 struct vattr *vap; 684 { 685 register struct nfsnode *np; 686 687 np = VTONFS(vp); 688 if ((time.tv_sec-np->n_attrstamp) < NFS_ATTRTIMEO) { 689 nfsstats.attrcache_hits++; 690 bcopy((caddr_t)&np->n_vattr,(caddr_t)vap,sizeof(struct vattr)); 691 if ((np->n_flag & NMODIFIED) == 0) 692 np->n_size = vap->va_size; 693 else if (np->n_size > vap->va_size) 694 vap->va_size = np->n_size; 695 return (0); 696 } else { 697 nfsstats.attrcache_misses++; 698 return (ENOENT); 699 } 700 } 701 702 /* 703 * nfs_namei - a liitle like namei(), but for one element only 704 * essentially look up file handle, fill in ndp and call VOP_LOOKUP() 705 */ 706 nfs_namei(ndp, fhp, len, mdp, dposp) 707 register struct nameidata *ndp; 708 fhandle_t *fhp; 709 int len; 710 struct mbuf **mdp; 711 caddr_t *dposp; 712 { 713 register int i, rem; 714 register struct mbuf *md; 715 register char *cp; 716 struct vnode *dp = (struct vnode *)0; 717 struct vnode *tdp; 718 struct mount *mp; 719 int flag; 720 int docache; 721 int wantparent; 722 int lockparent; 723 int rootflg = 0; 724 int error = 0; 725 726 ndp->ni_vp = ndp->ni_dvp = (struct vnode *)0; 727 flag = ndp->ni_nameiop & OPFLAG; 728 wantparent = ndp->ni_nameiop & (LOCKPARENT | WANTPARENT); 729 lockparent = ndp->ni_nameiop & LOCKPARENT; 730 docache = (ndp->ni_nameiop & NOCACHE) ^ NOCACHE; 731 if (flag == DELETE || wantparent) 732 docache = 0; 733 734 /* Fill in the nameidata and call lookup */ 735 cp = *dposp; 736 md = *mdp; 737 rem = mtod(md, caddr_t)+md->m_len-cp; 738 ndp->ni_hash = 0; 739 for (i = 0; i < len;) { 740 if (rem == 0) { 741 md = md->m_next; 742 if (md == NULL) 743 return (EBADRPC); 744 cp = mtod(md, caddr_t); 745 rem = md->m_len; 746 } 747 if (*cp == '\0' || *cp == '/') 748 return (EINVAL); 749 if (*cp & 0200) 750 if ((*cp&0377) == ('/'|0200) || flag != DELETE) 751 return (EINVAL); 752 ndp->ni_dent.d_name[i++] = *cp; 753 ndp->ni_hash += (unsigned char)*cp * i; 754 cp++; 755 rem--; 756 } 757 *mdp = md; 758 len = nfsm_rndup(len)-len; 759 if (len > 0) 760 *dposp = cp+len; 761 else 762 *dposp = cp; 763 ndp->ni_namelen = i; 764 ndp->ni_dent.d_namlen = i; 765 ndp->ni_dent.d_name[i] = '\0'; 766 ndp->ni_pathlen = 1; 767 ndp->ni_dirp = ndp->ni_ptr = &ndp->ni_dent.d_name[0]; 768 ndp->ni_next = &ndp->ni_dent.d_name[i]; 769 ndp->ni_loopcnt = 0; /* Not actually used for now */ 770 ndp->ni_endoff = 0; 771 if (docache) 772 ndp->ni_makeentry = 1; 773 else 774 ndp->ni_makeentry = 0; 775 ndp->ni_isdotdot = (i == 2 && 776 ndp->ni_dent.d_name[1] == '.' && ndp->ni_dent.d_name[0] == '.'); 777 778 if (error = nfsrv_fhtovp(fhp, TRUE, &dp, ndp->ni_cred)) 779 return (error); 780 if (dp->v_type != VDIR) { 781 vput(dp); 782 return (ENOTDIR); 783 } 784 /* 785 * Must set current directory here to avoid confusion in namei() 786 * called from rename() 787 */ 788 ndp->ni_cdir = dp; 789 ndp->ni_rdir = (struct vnode *)0; 790 791 /* 792 * Handle "..": 793 * If this vnode is the root of the mounted 794 * file system, then ignore it so can't get out 795 */ 796 if (ndp->ni_isdotdot && (dp->v_flag & VROOT)) { 797 ndp->ni_dvp = dp; 798 ndp->ni_vp = dp; 799 VREF(dp); 800 goto nextname; 801 } 802 803 /* 804 * We now have a segment name to search for, and a directory to search. 805 */ 806 if (error = VOP_LOOKUP(dp, ndp)) { 807 if (ndp->ni_vp != NULL) 808 panic("leaf should be empty"); 809 /* 810 * If creating and at end of pathname, then can consider 811 * allowing file to be created. 812 */ 813 if (ndp->ni_dvp->v_mount->m_flag & (M_RDONLY | M_EXRDONLY)) 814 error = EROFS; 815 if (flag == LOOKUP || flag == DELETE || error != ENOENT) 816 goto bad; 817 /* 818 * We return with ni_vp NULL to indicate that the entry 819 * doesn't currently exist, leaving a pointer to the 820 * (possibly locked) directory inode in ndp->ni_dvp. 821 */ 822 return (0); /* should this be ENOENT? */ 823 } 824 825 dp = ndp->ni_vp; 826 827 nextname: 828 ndp->ni_ptr = ndp->ni_next; 829 /* 830 * Check for read-only file systems 831 */ 832 if (flag == DELETE || flag == RENAME) { 833 /* 834 * Disallow directory write attempts on read-only 835 * file systems. 836 */ 837 if ((dp->v_mount->m_flag & (M_RDONLY|M_EXRDONLY)) || 838 (wantparent && (ndp->ni_dvp->v_mount->m_flag & (M_RDONLY|M_EXRDONLY)))) { 839 error = EROFS; 840 goto bad2; 841 } 842 } 843 844 if (!wantparent) 845 vrele(ndp->ni_dvp); 846 847 if ((ndp->ni_nameiop & LOCKLEAF) == 0) 848 VOP_UNLOCK(dp); 849 return (0); 850 851 bad2: 852 if (lockparent) 853 VOP_UNLOCK(ndp->ni_dvp); 854 vrele(ndp->ni_dvp); 855 bad: 856 vput(dp); 857 ndp->ni_vp = NULL; 858 return (error); 859 } 860 861 /* 862 * A fiddled version of m_adj() that ensures null fill to a long 863 * boundary and only trims off the back end 864 */ 865 nfsm_adj(mp, len, nul) 866 struct mbuf *mp; 867 register int len; 868 int nul; 869 { 870 register struct mbuf *m; 871 register int count, i; 872 register char *cp; 873 874 /* 875 * Trim from tail. Scan the mbuf chain, 876 * calculating its length and finding the last mbuf. 877 * If the adjustment only affects this mbuf, then just 878 * adjust and return. Otherwise, rescan and truncate 879 * after the remaining size. 880 */ 881 count = 0; 882 m = mp; 883 for (;;) { 884 count += m->m_len; 885 if (m->m_next == (struct mbuf *)0) 886 break; 887 m = m->m_next; 888 } 889 if (m->m_len > len) { 890 m->m_len -= len; 891 if (nul > 0) { 892 cp = mtod(m, caddr_t)+m->m_len-nul; 893 for (i = 0; i < nul; i++) 894 *cp++ = '\0'; 895 } 896 return; 897 } 898 count -= len; 899 if (count < 0) 900 count = 0; 901 /* 902 * Correct length for chain is "count". 903 * Find the mbuf with last data, adjust its length, 904 * and toss data from remaining mbufs on chain. 905 */ 906 for (m = mp; m; m = m->m_next) { 907 if (m->m_len >= count) { 908 m->m_len = count; 909 if (nul > 0) { 910 cp = mtod(m, caddr_t)+m->m_len-nul; 911 for (i = 0; i < nul; i++) 912 *cp++ = '\0'; 913 } 914 break; 915 } 916 count -= m->m_len; 917 } 918 while (m = m->m_next) 919 m->m_len = 0; 920 } 921 922 /* 923 * nfsrv_fhtovp() - convert a fh to a vnode ptr (optionally locked) 924 * - look up fsid in mount list (if not found ret error) 925 * - check that it is exported 926 * - get vp by calling VFS_FHTOVP() macro 927 * - if not lockflag unlock it with VOP_UNLOCK() 928 * - if cred->cr_uid == 0 set it to m_exroot 929 */ 930 nfsrv_fhtovp(fhp, lockflag, vpp, cred) 931 fhandle_t *fhp; 932 int lockflag; 933 struct vnode **vpp; 934 struct ucred *cred; 935 { 936 register struct mount *mp; 937 int error; 938 939 if ((mp = getvfs(&fhp->fh_fsid)) == NULL) 940 return (ESTALE); 941 if ((mp->m_flag & M_EXPORTED) == 0) 942 return (EACCES); 943 if (VFS_FHTOVP(mp, &fhp->fh_fid, vpp)) 944 return (ESTALE); 945 if (cred->cr_uid == 0) 946 cred->cr_uid = mp->m_exroot; 947 if (!lockflag) 948 VOP_UNLOCK(*vpp); 949 return (0); 950 } 951