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_vnops.c 7.13 (Berkeley) 11/03/89 21 */ 22 23 /* 24 * vnode op calls for sun nfs version 2 25 */ 26 27 #include "machine/pte.h" 28 #include "machine/mtpr.h" 29 #include "strings.h" 30 #include "param.h" 31 #include "user.h" 32 #include "proc.h" 33 #include "mount.h" 34 #include "buf.h" 35 #include "vm.h" 36 #include "../ufs/dir.h" 37 #include "malloc.h" 38 #include "mbuf.h" 39 #include "uio.h" 40 #include "ucred.h" 41 #include "namei.h" 42 #include "errno.h" 43 #include "file.h" 44 #include "conf.h" 45 #include "vnode.h" 46 #include "../ufs/inode.h" 47 #include "map.h" 48 #include "nfsv2.h" 49 #include "nfs.h" 50 #include "nfsnode.h" 51 #include "nfsmount.h" 52 #include "xdr_subs.h" 53 #include "nfsm_subs.h" 54 #include "nfsiom.h" 55 56 /* Defs */ 57 #define TRUE 1 58 #define FALSE 0 59 60 /* Global vars */ 61 int nfs_lookup(), 62 nfs_create(), 63 nfs_mknod(), 64 nfs_open(), 65 nfs_close(), 66 nfs_access(), 67 nfs_getattr(), 68 nfs_setattr(), 69 nfs_read(), 70 nfs_write(), 71 vfs_noop(), 72 vfs_nullop(), 73 nfs_remove(), 74 nfs_link(), 75 nfs_rename(), 76 nfs_mkdir(), 77 nfs_rmdir(), 78 nfs_symlink(), 79 nfs_readdir(), 80 nfs_readlink(), 81 nfs_abortop(), 82 nfs_lock(), 83 nfs_unlock(), 84 nfs_bmap(), 85 nfs_strategy(), 86 nfs_fsync(), 87 nfs_inactive(), 88 nfs_reclaim(); 89 90 struct vnodeops nfsv2_vnodeops = { 91 nfs_lookup, 92 nfs_create, 93 nfs_mknod, 94 nfs_open, 95 nfs_close, 96 nfs_access, 97 nfs_getattr, 98 nfs_setattr, 99 nfs_read, 100 nfs_write, 101 vfs_noop, 102 vfs_noop, 103 vfs_noop, 104 nfs_fsync, 105 vfs_nullop, 106 nfs_remove, 107 nfs_link, 108 nfs_rename, 109 nfs_mkdir, 110 nfs_rmdir, 111 nfs_symlink, 112 nfs_readdir, 113 nfs_readlink, 114 nfs_abortop, 115 nfs_inactive, 116 nfs_reclaim, 117 nfs_lock, 118 nfs_unlock, 119 nfs_bmap, 120 nfs_strategy, 121 }; 122 123 /* Special device vnode ops */ 124 int spec_lookup(), 125 spec_open(), 126 spec_read(), 127 spec_write(), 128 spec_strategy(), 129 spec_ioctl(), 130 spec_select(), 131 spec_close(), 132 spec_badop(), 133 spec_nullop(); 134 135 struct vnodeops spec_nfsv2nodeops = { 136 spec_lookup, 137 spec_badop, 138 spec_badop, 139 spec_open, 140 spec_close, 141 nfs_access, 142 nfs_getattr, 143 nfs_setattr, 144 spec_read, 145 spec_write, 146 spec_ioctl, 147 spec_select, 148 spec_badop, 149 spec_nullop, 150 spec_badop, 151 spec_badop, 152 spec_badop, 153 spec_badop, 154 spec_badop, 155 spec_badop, 156 spec_badop, 157 spec_badop, 158 spec_badop, 159 spec_badop, 160 nfs_inactive, 161 nfs_reclaim, 162 nfs_lock, 163 nfs_unlock, 164 spec_badop, 165 spec_strategy, 166 }; 167 168 extern u_long nfs_procids[NFS_NPROCS]; 169 extern u_long nfs_prog, nfs_vers; 170 extern char nfsiobuf[MAXPHYS+NBPG]; 171 struct map nfsmap[NFS_MSIZ]; 172 enum vtype v_type[NFLNK+1]; 173 struct buf nfs_bqueue; /* Queue head for nfsiod's */ 174 int nfs_asyncdaemons = 0; 175 struct proc *nfs_iodwant[MAX_ASYNCDAEMON]; 176 static int nfsmap_want = 0; 177 178 /* 179 * nfs null call from vfs. 180 */ 181 nfs_null(vp, cred) 182 struct vnode *vp; 183 struct ucred *cred; 184 { 185 caddr_t bpos, dpos; 186 u_long xid; 187 int error = 0; 188 struct mbuf *mreq, *mrep, *md, *mb; 189 190 nfsm_reqhead(nfs_procids[NFSPROC_NULL], cred, 0); 191 nfsm_request(vp); 192 nfsm_reqdone; 193 return (error); 194 } 195 196 /* 197 * nfs access vnode op. 198 * Essentially just get vattr and then imitate iaccess() 199 */ 200 nfs_access(vp, mode, cred) 201 struct vnode *vp; 202 int mode; 203 register struct ucred *cred; 204 { 205 register struct vattr *vap; 206 register gid_t *gp; 207 struct vattr vattr; 208 register int i; 209 int error; 210 211 /* 212 * If you're the super-user, 213 * you always get access. 214 */ 215 if (cred->cr_uid == 0) 216 return (0); 217 vap = &vattr; 218 if (error = nfs_getattr(vp, vap, cred)) 219 return (error); 220 /* 221 * Access check is based on only one of owner, group, public. 222 * If not owner, then check group. If not a member of the 223 * group, then check public access. 224 */ 225 if (cred->cr_uid != vap->va_uid) { 226 mode >>= 3; 227 gp = cred->cr_groups; 228 for (i = 0; i < cred->cr_ngroups; i++, gp++) 229 if (vap->va_gid == *gp) 230 goto found; 231 mode >>= 3; 232 found: 233 ; 234 } 235 if ((vap->va_mode & mode) != 0) 236 return (0); 237 return (EACCES); 238 } 239 240 /* 241 * nfs open vnode op 242 * Just check to see if the type is ok 243 */ 244 /* ARGSUSED */ 245 nfs_open(vp, mode, cred) 246 struct vnode *vp; 247 int mode; 248 struct ucred *cred; 249 { 250 register enum vtype vtyp; 251 252 vtyp = vp->v_type; 253 if (vtyp == VREG || vtyp == VDIR || vtyp == VLNK) 254 return (0); 255 else 256 return (EACCES); 257 } 258 259 /* 260 * nfs close vnode op 261 * For reg files, invalidate any buffer cache entries. 262 */ 263 /* ARGSUSED */ 264 nfs_close(vp, fflags, cred) 265 register struct vnode *vp; 266 int fflags; 267 struct ucred *cred; 268 { 269 register struct nfsnode *np = VTONFS(vp); 270 int error = 0; 271 272 if (vp->v_type == VREG && ((np->n_flag & NMODIFIED) || 273 ((np->n_flag & NBUFFERED) && np->n_sillyrename))) { 274 nfs_lock(vp); 275 np->n_flag &= ~(NMODIFIED|NBUFFERED); 276 error = nfs_blkflush(vp, (daddr_t)0, np->n_size, TRUE); 277 if (np->n_flag & NWRITEERR) { 278 np->n_flag &= ~NWRITEERR; 279 if (!error) 280 error = np->n_error ? np->n_error : EIO; 281 } 282 nfs_unlock(vp); 283 } 284 return (error); 285 } 286 287 /* 288 * nfs getattr call from vfs. 289 */ 290 nfs_getattr(vp, vap, cred) 291 register struct vnode *vp; 292 struct vattr *vap; 293 struct ucred *cred; 294 { 295 register caddr_t cp; 296 register long t1; 297 caddr_t bpos, dpos; 298 u_long xid; 299 int error = 0; 300 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 301 302 /* First look in the cache.. */ 303 if (nfs_getattrcache(vp, vap) == 0) 304 return (0); 305 nfsstats.rpccnt[NFSPROC_GETATTR]++; 306 nfsm_reqhead(nfs_procids[NFSPROC_GETATTR], cred, NFSX_FH); 307 nfsm_fhtom(vp); 308 nfsm_request(vp); 309 nfsm_loadattr(vp, vap); 310 nfsm_reqdone; 311 return (error); 312 } 313 314 /* 315 * nfs setattr call. 316 */ 317 nfs_setattr(vp, vap, cred) 318 register struct vnode *vp; 319 register struct vattr *vap; 320 struct ucred *cred; 321 { 322 register struct nfsv2_sattr *sp; 323 register caddr_t cp; 324 register long t1; 325 caddr_t bpos, dpos; 326 u_long xid; 327 int error = 0; 328 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 329 struct nfsnode *np; 330 331 nfsstats.rpccnt[NFSPROC_SETATTR]++; 332 nfsm_reqhead(nfs_procids[NFSPROC_SETATTR], cred, NFSX_FH+NFSX_SATTR); 333 nfsm_fhtom(vp); 334 nfsm_build(sp, struct nfsv2_sattr *, NFSX_SATTR); 335 if (vap->va_mode == 0xffff) 336 sp->sa_mode = VNOVAL; 337 else 338 sp->sa_mode = vtonfs_mode(vp->v_type, vap->va_mode); 339 if (vap->va_uid == 0xffff) 340 sp->sa_uid = VNOVAL; 341 else 342 sp->sa_uid = txdr_unsigned(vap->va_uid); 343 if (vap->va_gid == 0xffff) 344 sp->sa_gid = VNOVAL; 345 else 346 sp->sa_gid = txdr_unsigned(vap->va_gid); 347 sp->sa_size = txdr_unsigned(vap->va_size); 348 if (vap->va_size != VNOVAL) { 349 np = VTONFS(vp); 350 if (np->n_flag & NMODIFIED) { 351 np->n_flag &= ~NMODIFIED; 352 nfs_blkflush(vp, (daddr_t)0, np->n_size, TRUE); 353 } 354 } 355 txdr_time(&vap->va_atime, &sp->sa_atime); 356 txdr_time(&vap->va_mtime, &sp->sa_mtime); 357 nfsm_request(vp); 358 nfsm_loadattr(vp, (struct vattr *)0); 359 /* should we fill in any vap fields ?? */ 360 nfsm_reqdone; 361 return (error); 362 } 363 364 /* 365 * nfs lookup call, one step at a time... 366 * First look in cache 367 * If not found, unlock the directory nfsnode and do the rpc 368 */ 369 nfs_lookup(vp, ndp) 370 register struct vnode *vp; 371 register struct nameidata *ndp; 372 { 373 register struct vnode *vdp; 374 register u_long *p; 375 register caddr_t cp; 376 register long t1, t2; 377 caddr_t bpos, dpos, cp2; 378 u_long xid; 379 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 380 struct vnode *newvp; 381 long len; 382 nfsv2fh_t *fhp; 383 struct nfsnode *np; 384 int lockparent, wantparent, flag, error = 0; 385 386 ndp->ni_dvp = vp; 387 ndp->ni_vp = NULL; 388 if (vp->v_type != VDIR) 389 return (ENOTDIR); 390 lockparent = ndp->ni_nameiop & LOCKPARENT; 391 flag = ndp->ni_nameiop & OPFLAG; 392 wantparent = ndp->ni_nameiop & (LOCKPARENT|WANTPARENT); 393 if ((error = cache_lookup(ndp)) && error != ENOENT) { 394 struct vattr vattr; 395 int vpid; 396 397 if (vp == ndp->ni_rdir && ndp->ni_isdotdot) 398 panic("nfs_lookup: .. through root"); 399 vdp = ndp->ni_vp; 400 vpid = vdp->v_id; 401 /* 402 * See the comment starting `Step through' in ufs/ufs_lookup.c 403 * for an explanation of the locking protocol 404 */ 405 if (vp == vdp) { 406 VREF(vdp); 407 error = 0; 408 } else if (ndp->ni_isdotdot) { 409 nfs_unlock(vp); 410 error = vget(vdp); 411 } else { 412 error = vget(vdp); 413 nfs_unlock(vp); 414 } 415 if (!error) { 416 if (vpid == vdp->v_id && 417 !nfs_getattr(vdp, &vattr, ndp->ni_cred)) { 418 nfsstats.lookupcache_hits++; 419 return (0); 420 } else { 421 nfs_nput(vdp); 422 } 423 } 424 nfs_lock(vp); 425 ndp->ni_vp = (struct vnode *)0; 426 } 427 error = 0; 428 nfsstats.lookupcache_misses++; 429 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 430 len = ndp->ni_namelen; 431 nfsm_reqhead(nfs_procids[NFSPROC_LOOKUP], ndp->ni_cred, NFSX_FH+NFSX_UNSIGNED+nfsm_rndup(len)); 432 nfsm_fhtom(vp); 433 nfsm_strtom(ndp->ni_ptr, len, NFS_MAXNAMLEN); 434 nfsm_request(vp); 435 nfsmout: 436 if (error) { 437 if ((flag == CREATE || flag == RENAME) && 438 *ndp->ni_next == 0) { 439 if (!lockparent) 440 nfs_unlock(vp); 441 } 442 return (ENOENT); 443 } 444 nfsm_disect(fhp,nfsv2fh_t *,NFSX_FH); 445 446 /* 447 * Handle DELETE and RENAME cases... 448 */ 449 if (flag == DELETE && *ndp->ni_next == 0) { 450 if (!bcmp(VTONFS(vp)->n_fh.fh_bytes, (caddr_t)fhp, NFSX_FH)) { 451 VREF(vp); 452 newvp = vp; 453 np = VTONFS(vp); 454 } else { 455 if (error = nfs_nget(vp->v_mount, fhp, &np)) { 456 m_freem(mrep); 457 return (error); 458 } 459 newvp = NFSTOV(np); 460 } 461 if (error = 462 nfs_loadattrcache(&newvp, &md, &dpos, (struct vattr *)0)) { 463 if (newvp != vp) 464 nfs_nput(newvp); 465 else 466 vrele(vp); 467 m_freem(mrep); 468 return (error); 469 } 470 ndp->ni_vp = newvp; 471 if (!lockparent) 472 nfs_unlock(vp); 473 m_freem(mrep); 474 return (0); 475 } 476 477 if (flag == RENAME && wantparent && *ndp->ni_next == 0) { 478 if (!bcmp(VTONFS(vp)->n_fh.fh_bytes, (caddr_t)fhp, NFSX_FH)) { 479 m_freem(mrep); 480 return (EISDIR); 481 } 482 if (error = nfs_nget(vp->v_mount, fhp, &np)) { 483 m_freem(mrep); 484 return (error); 485 } 486 newvp = NFSTOV(np); 487 if (error = 488 nfs_loadattrcache(&newvp, &md, &dpos, (struct vattr *)0)) { 489 nfs_nput(newvp); 490 m_freem(mrep); 491 return (error); 492 } 493 ndp->ni_vp = newvp; 494 if (!lockparent) 495 nfs_unlock(vp); 496 return (0); 497 } 498 499 if (!bcmp(VTONFS(vp)->n_fh.fh_bytes, (caddr_t)fhp, NFSX_FH)) { 500 VREF(vp); 501 newvp = vp; 502 np = VTONFS(vp); 503 } else if (ndp->ni_isdotdot) { 504 nfs_unlock(vp); 505 if (error = nfs_nget(vp->v_mount, fhp, &np)) { 506 nfs_lock(vp); 507 m_freem(mrep); 508 return (error); 509 } 510 nfs_lock(vp); 511 newvp = NFSTOV(np); 512 } else { 513 if (error = nfs_nget(vp->v_mount, fhp, &np)) { 514 m_freem(mrep); 515 return (error); 516 } 517 newvp = NFSTOV(np); 518 } 519 if (error = nfs_loadattrcache(&newvp, &md, &dpos, (struct vattr *)0)) { 520 if (newvp != vp) 521 nfs_nput(newvp); 522 else 523 vrele(vp); 524 m_freem(mrep); 525 return (error); 526 } 527 m_freem(mrep); 528 529 if (vp != newvp && (!lockparent || *ndp->ni_next != '\0')) 530 nfs_unlock(vp); 531 ndp->ni_vp = newvp; 532 if (error == 0 && ndp->ni_makeentry) 533 cache_enter(ndp); 534 return (error); 535 } 536 537 /* 538 * nfs readlink call 539 */ 540 nfs_readlink(vp, uiop, cred) 541 register struct vnode *vp; 542 struct uio *uiop; 543 struct ucred *cred; 544 { 545 register u_long *p; 546 register caddr_t cp; 547 register long t1; 548 caddr_t bpos, dpos, cp2; 549 u_long xid; 550 int error = 0; 551 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 552 long len; 553 554 nfsstats.rpccnt[NFSPROC_READLINK]++; 555 nfsm_reqhead(nfs_procids[NFSPROC_READLINK], cred, NFSX_FH); 556 nfsm_fhtom(vp); 557 nfsm_request(vp); 558 nfsm_strsiz(len, NFS_MAXPATHLEN); 559 nfsm_mtouio(uiop, len); 560 nfsm_reqdone; 561 return (error); 562 } 563 564 /* 565 * nfs read call 566 */ 567 nfs_readrpc(vp, uiop, offp, cred) 568 register struct vnode *vp; 569 struct uio *uiop; 570 off_t *offp; 571 struct ucred *cred; 572 { 573 register u_long *p; 574 register caddr_t cp; 575 register long t1; 576 caddr_t bpos, dpos, cp2; 577 u_long xid; 578 int error = 0; 579 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 580 struct nfsmount *nmp; 581 long len, retlen, tsiz; 582 583 nmp = vfs_to_nfs(vp->v_mount); 584 tsiz = uiop->uio_resid; 585 while (tsiz > 0) { 586 nfsstats.rpccnt[NFSPROC_READ]++; 587 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz; 588 nfsm_reqhead(nfs_procids[NFSPROC_READ], cred, NFSX_FH+NFSX_UNSIGNED*3); 589 nfsm_fhtom(vp); 590 nfsm_build(p, u_long *, NFSX_UNSIGNED*3); 591 *p++ = txdr_unsigned(*offp); 592 *p++ = txdr_unsigned(len); 593 *p = 0; 594 nfsm_request(vp); 595 nfsm_loadattr(vp, (struct vattr *)0); 596 nfsm_strsiz(retlen, nmp->nm_rsize); 597 nfsm_mtouio(uiop, retlen); 598 m_freem(mrep); 599 *offp += retlen; 600 if (retlen < len) 601 tsiz = 0; 602 else 603 tsiz -= len; 604 } 605 nfsmout: 606 return (error); 607 } 608 609 /* 610 * nfs write call 611 */ 612 nfs_writerpc(vp, uiop, offp, cred) 613 register struct vnode *vp; 614 struct uio *uiop; 615 off_t *offp; 616 struct ucred *cred; 617 { 618 register u_long *p; 619 register caddr_t cp; 620 register long t1; 621 caddr_t bpos, dpos; 622 u_long xid; 623 int error = 0; 624 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 625 struct nfsmount *nmp; 626 long len, tsiz; 627 628 nmp = vfs_to_nfs(vp->v_mount); 629 tsiz = uiop->uio_resid; 630 while (tsiz > 0) { 631 nfsstats.rpccnt[NFSPROC_WRITE]++; 632 len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz; 633 nfsm_reqhead(nfs_procids[NFSPROC_WRITE], cred, 634 NFSX_FH+NFSX_UNSIGNED*4); 635 nfsm_fhtom(vp); 636 nfsm_build(p, u_long *, NFSX_UNSIGNED*4); 637 *(p+1) = txdr_unsigned(*offp); 638 *(p+3) = txdr_unsigned(len); 639 nfsm_uiotom(uiop, len); 640 nfsm_request(vp); 641 nfsm_loadattr(vp, (struct vattr *)0); 642 m_freem(mrep); 643 tsiz -= len; 644 *offp += len; 645 } 646 nfsmout: 647 return (error); 648 } 649 650 /* 651 * nfs mknod call 652 * This call is currently not supported. 653 */ 654 /* ARGSUSED */ 655 nfs_mknod(ndp, vap, cred) 656 struct nameidata *ndp; 657 struct ucred *cred; 658 struct vattr *vap; 659 { 660 661 nfs_abortop(ndp); 662 return (EOPNOTSUPP); 663 } 664 665 /* 666 * nfs file create call 667 */ 668 nfs_create(ndp, vap) 669 register struct nameidata *ndp; 670 register struct vattr *vap; 671 { 672 register struct nfsv2_sattr *sp; 673 register u_long *p; 674 register caddr_t cp; 675 register long t1, t2; 676 caddr_t bpos, dpos, cp2; 677 u_long xid; 678 int error = 0; 679 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 680 681 nfsstats.rpccnt[NFSPROC_CREATE]++; 682 nfsm_reqhead(nfs_procids[NFSPROC_CREATE], ndp->ni_cred, 683 NFSX_FH+NFSX_UNSIGNED+nfsm_rndup(ndp->ni_dent.d_namlen)+NFSX_SATTR); 684 nfsm_fhtom(ndp->ni_dvp); 685 nfsm_strtom(ndp->ni_dent.d_name, ndp->ni_dent.d_namlen, NFS_MAXNAMLEN); 686 nfsm_build(sp, struct nfsv2_sattr *, NFSX_SATTR); 687 sp->sa_mode = vtonfs_mode(VREG, vap->va_mode); 688 sp->sa_uid = txdr_unsigned(ndp->ni_cred->cr_uid); 689 sp->sa_gid = txdr_unsigned(ndp->ni_cred->cr_gid); 690 sp->sa_size = txdr_unsigned(0); 691 /* or should these be VNOVAL ?? */ 692 txdr_time(&vap->va_atime, &sp->sa_atime); 693 txdr_time(&vap->va_mtime, &sp->sa_mtime); 694 nfsm_request(ndp->ni_dvp); 695 nfsm_mtofh(ndp->ni_dvp, ndp->ni_vp); 696 nfsm_reqdone; 697 nfs_nput(ndp->ni_dvp); 698 return (error); 699 } 700 701 /* 702 * nfs file remove call 703 * To try and make nfs semantics closer to vfs semantics, a file that has 704 * other references to the vnode is renamed instead of removed and then 705 * removed later on the last close. 706 * Unfortunately you must flush the buffer cache and cmap to get rid of 707 * all extraneous vnode references before you check the reference cnt. 708 * 1 - If the file could have blocks in the buffer cache 709 * flush them out and invalidate them 710 * mpurge the vnode to flush out cmap references 711 * (This is necessary to update the vnode ref cnt as well as sensible 712 * for actual removes, to free up the buffers) 713 * 2 - If v_count > 1 714 * If a rename is not already in the works 715 * call nfs_sillyrename() to set it up 716 * else 717 * do the remove rpc 718 */ 719 nfs_remove(ndp) 720 register struct nameidata *ndp; 721 { 722 register struct vnode *vp = ndp->ni_vp; 723 register struct nfsnode *np = VTONFS(ndp->ni_vp); 724 register u_long *p; 725 register caddr_t cp; 726 register long t1, t2; 727 caddr_t bpos, dpos; 728 u_long xid; 729 int error = 0; 730 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 731 732 if (vp->v_type == VREG) { 733 if (np->n_flag & (NMODIFIED|NBUFFERED)) { 734 np->n_flag &= ~(NMODIFIED|NBUFFERED); 735 nfs_blkflush(vp, (daddr_t)0, np->n_size, TRUE); 736 } 737 if (np->n_flag & NPAGEDON) 738 mpurge(vp); /* In case cmap entries still ref it */ 739 } 740 if (vp->v_count > 1) { 741 if (!np->n_sillyrename) 742 error = nfs_sillyrename(ndp, REMOVE); 743 } else { 744 nfsstats.rpccnt[NFSPROC_REMOVE]++; 745 nfsm_reqhead(nfs_procids[NFSPROC_REMOVE], ndp->ni_cred, 746 NFSX_FH+NFSX_UNSIGNED+nfsm_rndup(ndp->ni_dent.d_namlen)); 747 nfsm_fhtom(ndp->ni_dvp); 748 nfsm_strtom(ndp->ni_dent.d_name, ndp->ni_dent.d_namlen, NFS_MAXNAMLEN); 749 nfsm_request(ndp->ni_dvp); 750 nfsm_reqdone; 751 } 752 if (ndp->ni_dvp == ndp->ni_vp) 753 vrele(ndp->ni_vp); 754 else 755 nfs_nput(ndp->ni_vp); 756 nfs_nput(ndp->ni_dvp); 757 return (error); 758 } 759 760 /* 761 * nfs file remove rpc called from nfs_inactive 762 */ 763 nfs_removeit(ndp) 764 register struct nameidata *ndp; 765 { 766 register u_long *p; 767 register caddr_t cp; 768 register long t1, t2; 769 caddr_t bpos, dpos; 770 u_long xid; 771 int error = 0; 772 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 773 774 nfsstats.rpccnt[NFSPROC_REMOVE]++; 775 nfsm_reqhead(nfs_procids[NFSPROC_REMOVE], ndp->ni_cred, 776 NFSX_FH+NFSX_UNSIGNED+nfsm_rndup(ndp->ni_dent.d_namlen)); 777 nfsm_fhtom(ndp->ni_dvp); 778 nfsm_strtom(ndp->ni_dent.d_name, ndp->ni_dent.d_namlen, NFS_MAXNAMLEN); 779 nfsm_request(ndp->ni_dvp); 780 nfsm_reqdone; 781 return (error); 782 } 783 784 /* 785 * nfs file rename call 786 */ 787 nfs_rename(sndp, tndp) 788 register struct nameidata *sndp, *tndp; 789 { 790 register u_long *p; 791 register caddr_t cp; 792 register long t1, t2; 793 caddr_t bpos, dpos; 794 u_long xid; 795 int error = 0; 796 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 797 798 nfsstats.rpccnt[NFSPROC_RENAME]++; 799 nfsm_reqhead(nfs_procids[NFSPROC_RENAME], tndp->ni_cred, 800 (NFSX_FH+NFSX_UNSIGNED)*2+nfsm_rndup(sndp->ni_dent.d_namlen)+ 801 nfsm_rndup(tndp->ni_dent.d_namlen)); /* or sndp->ni_cred?*/ 802 nfsm_fhtom(sndp->ni_dvp); 803 nfsm_strtom(sndp->ni_dent.d_name,sndp->ni_dent.d_namlen,NFS_MAXNAMLEN); 804 nfsm_fhtom(tndp->ni_dvp); 805 nfsm_strtom(tndp->ni_dent.d_name,tndp->ni_dent.d_namlen,NFS_MAXNAMLEN); 806 nfsm_request(sndp->ni_dvp); 807 nfsm_reqdone; 808 if (sndp->ni_vp->v_type == VDIR) { 809 if (tndp->ni_vp != NULL && tndp->ni_vp->v_type == VDIR) 810 cache_purge(tndp->ni_dvp); 811 cache_purge(sndp->ni_dvp); 812 } 813 nfs_abortop(sndp); 814 nfs_abortop(tndp); 815 return (error); 816 } 817 818 /* 819 * nfs file rename rpc called from above 820 */ 821 nfs_renameit(sndp, tndp) 822 register struct nameidata *sndp, *tndp; 823 { 824 register u_long *p; 825 register caddr_t cp; 826 register long t1, t2; 827 caddr_t bpos, dpos; 828 u_long xid; 829 int error = 0; 830 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 831 832 nfsstats.rpccnt[NFSPROC_RENAME]++; 833 nfsm_reqhead(nfs_procids[NFSPROC_RENAME], tndp->ni_cred, 834 (NFSX_FH+NFSX_UNSIGNED)*2+nfsm_rndup(sndp->ni_dent.d_namlen)+ 835 nfsm_rndup(tndp->ni_dent.d_namlen)); /* or sndp->ni_cred?*/ 836 nfsm_fhtom(sndp->ni_dvp); 837 nfsm_strtom(sndp->ni_dent.d_name,sndp->ni_dent.d_namlen,NFS_MAXNAMLEN); 838 nfsm_fhtom(tndp->ni_dvp); 839 nfsm_strtom(tndp->ni_dent.d_name,tndp->ni_dent.d_namlen,NFS_MAXNAMLEN); 840 nfsm_request(sndp->ni_dvp); 841 nfsm_reqdone; 842 return (error); 843 } 844 845 /* 846 * nfs hard link create call 847 */ 848 nfs_link(vp, ndp) 849 register struct vnode *vp; 850 register struct nameidata *ndp; 851 { 852 register u_long *p; 853 register caddr_t cp; 854 register long t1, t2; 855 caddr_t bpos, dpos; 856 u_long xid; 857 int error = 0; 858 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 859 860 if (ndp->ni_dvp != vp) 861 nfs_lock(vp); 862 nfsstats.rpccnt[NFSPROC_LINK]++; 863 nfsm_reqhead(nfs_procids[NFSPROC_LINK], ndp->ni_cred, 864 NFSX_FH*2+NFSX_UNSIGNED+nfsm_rndup(ndp->ni_dent.d_namlen)); 865 nfsm_fhtom(vp); 866 nfsm_fhtom(ndp->ni_dvp); 867 nfsm_strtom(ndp->ni_dent.d_name, ndp->ni_dent.d_namlen, NFS_MAXNAMLEN); 868 nfsm_request(vp); 869 nfsm_reqdone; 870 if (ndp->ni_dvp != vp) 871 nfs_unlock(vp); 872 nfs_nput(ndp->ni_dvp); 873 return (error); 874 } 875 876 /* 877 * nfs symbolic link create call 878 */ 879 nfs_symlink(ndp, vap, nm) 880 struct nameidata *ndp; 881 struct vattr *vap; 882 char *nm; /* is this the path ?? */ 883 { 884 register struct nfsv2_sattr *sp; 885 register u_long *p; 886 register caddr_t cp; 887 register long t1, t2; 888 caddr_t bpos, dpos; 889 u_long xid; 890 int error = 0; 891 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 892 893 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 894 nfsm_reqhead(nfs_procids[NFSPROC_SYMLINK], ndp->ni_cred, 895 NFSX_FH+NFSX_UNSIGNED+nfsm_rndup(ndp->ni_dent.d_namlen)+NFSX_UNSIGNED); 896 nfsm_fhtom(ndp->ni_dvp); 897 nfsm_strtom(ndp->ni_dent.d_name, ndp->ni_dent.d_namlen, NFS_MAXNAMLEN); 898 nfsm_strtom(nm, strlen(nm), NFS_MAXPATHLEN); 899 nfsm_build(sp, struct nfsv2_sattr *, NFSX_SATTR); 900 sp->sa_mode = vtonfs_mode(VLNK, vap->va_mode); 901 sp->sa_uid = txdr_unsigned(ndp->ni_cred->cr_uid); 902 sp->sa_gid = txdr_unsigned(ndp->ni_cred->cr_gid); 903 sp->sa_size = txdr_unsigned(VNOVAL); 904 txdr_time(&vap->va_atime, &sp->sa_atime); /* or VNOVAL ?? */ 905 txdr_time(&vap->va_mtime, &sp->sa_mtime); /* or VNOVAL ?? */ 906 nfsm_request(ndp->ni_dvp); 907 nfsm_reqdone; 908 nfs_nput(ndp->ni_dvp); 909 return (error); 910 } 911 912 /* 913 * nfs make dir call 914 */ 915 nfs_mkdir(ndp, vap) 916 register struct nameidata *ndp; 917 struct vattr *vap; 918 { 919 register struct nfsv2_sattr *sp; 920 register u_long *p; 921 register caddr_t cp; 922 register long t1, t2; 923 caddr_t bpos, dpos, cp2; 924 u_long xid; 925 int error = 0; 926 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 927 928 nfsstats.rpccnt[NFSPROC_MKDIR]++; 929 nfsm_reqhead(nfs_procids[NFSPROC_MKDIR], ndp->ni_cred, 930 NFSX_FH+NFSX_UNSIGNED+nfsm_rndup(ndp->ni_dent.d_namlen)+NFSX_SATTR); 931 nfsm_fhtom(ndp->ni_dvp); 932 nfsm_strtom(ndp->ni_dent.d_name, ndp->ni_dent.d_namlen, NFS_MAXNAMLEN); 933 nfsm_build(sp, struct nfsv2_sattr *, NFSX_SATTR); 934 sp->sa_mode = vtonfs_mode(VDIR, vap->va_mode); 935 sp->sa_uid = txdr_unsigned(ndp->ni_cred->cr_uid); 936 sp->sa_gid = txdr_unsigned(ndp->ni_cred->cr_gid); 937 sp->sa_size = txdr_unsigned(VNOVAL); 938 txdr_time(&vap->va_atime, &sp->sa_atime); /* or VNOVAL ?? */ 939 txdr_time(&vap->va_mtime, &sp->sa_mtime); /* or VNOVAL ?? */ 940 nfsm_request(ndp->ni_dvp); 941 nfsm_mtofh(ndp->ni_dvp, ndp->ni_vp); 942 nfsm_reqdone; 943 nfs_nput(ndp->ni_dvp); 944 return (error); 945 } 946 947 /* 948 * nfs remove directory call 949 */ 950 nfs_rmdir(ndp) 951 register struct nameidata *ndp; 952 { 953 register u_long *p; 954 register caddr_t cp; 955 register long t1, t2; 956 caddr_t bpos, dpos; 957 u_long xid; 958 int error = 0; 959 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 960 961 if (ndp->ni_dvp == ndp->ni_vp) { 962 vrele(ndp->ni_dvp); 963 nfs_nput(ndp->ni_dvp); 964 return (EINVAL); 965 } 966 nfsstats.rpccnt[NFSPROC_RMDIR]++; 967 nfsm_reqhead(nfs_procids[NFSPROC_RMDIR], ndp->ni_cred, 968 NFSX_FH+NFSX_UNSIGNED+nfsm_rndup(ndp->ni_dent.d_namlen)); 969 nfsm_fhtom(ndp->ni_dvp); 970 nfsm_strtom(ndp->ni_dent.d_name, ndp->ni_dent.d_namlen, NFS_MAXNAMLEN); 971 nfsm_request(ndp->ni_dvp); 972 nfsm_reqdone; 973 cache_purge(ndp->ni_dvp); 974 cache_purge(ndp->ni_vp); 975 nfs_nput(ndp->ni_vp); 976 nfs_nput(ndp->ni_dvp); 977 return (error); 978 } 979 980 /* 981 * nfs readdir call 982 * Although cookie is defined as opaque, I translate it to/from net byte 983 * order so that it looks more sensible. This appears consistent with the 984 * Ultrix implementation of NFS. 985 */ 986 nfs_readdir(vp, uiop, offp, cred) 987 register struct vnode *vp; 988 struct uio *uiop; 989 off_t *offp; 990 struct ucred *cred; 991 { 992 register long len; 993 register struct direct *dp; 994 register u_long *p; 995 register caddr_t cp; 996 register long t1; 997 caddr_t bpos, dpos, cp2; 998 u_long xid; 999 int error = 0; 1000 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1001 struct mbuf *md2; 1002 caddr_t dpos2; 1003 int siz; 1004 int more_dirs, eofflg; 1005 off_t off, savoff; 1006 struct direct *savdp; 1007 1008 nfs_lock(vp); 1009 nfsstats.rpccnt[NFSPROC_READDIR]++; 1010 nfsm_reqhead(nfs_procids[NFSPROC_READDIR], cred, xid); 1011 nfsm_fhtom(vp); 1012 nfsm_build(p, u_long *, 2*NFSX_UNSIGNED); 1013 off = *offp; 1014 *p++ = txdr_unsigned(off); 1015 *p = txdr_unsigned(uiop->uio_resid); 1016 nfsm_request(vp); 1017 siz = 0; 1018 nfsm_disect(p, u_long *, NFSX_UNSIGNED); 1019 more_dirs = fxdr_unsigned(int, *p); 1020 1021 /* Save the position so that we can do nfsm_mtouio() later */ 1022 dpos2 = dpos; 1023 md2 = md; 1024 1025 /* loop thru the dir entries, doctoring them to 4bsd form */ 1026 savoff = off = 0; 1027 savdp = dp = NULL; 1028 while (more_dirs && siz < uiop->uio_resid) { 1029 savoff = off; /* Hold onto offset and dp */ 1030 savdp = dp; 1031 nfsm_disecton(p, u_long *, 2*NFSX_UNSIGNED); 1032 dp = (struct direct *)p; 1033 dp->d_ino = fxdr_unsigned(u_long, *p++); 1034 len = fxdr_unsigned(int, *p); 1035 if (len <= 0 || len > NFS_MAXNAMLEN) { 1036 error = EBADRPC; 1037 m_freem(mrep); 1038 goto nfsmout; 1039 } 1040 dp->d_namlen = (u_short)len; 1041 len = nfsm_rndup(len); 1042 nfsm_adv(len); 1043 nfsm_disecton(p, u_long *, 2*NFSX_UNSIGNED); 1044 off = fxdr_unsigned(off_t, *p); 1045 *p++ = 0; /* Ensures null termination of name */ 1046 more_dirs = fxdr_unsigned(int, *p); 1047 dp->d_reclen = len+4*NFSX_UNSIGNED; 1048 siz += dp->d_reclen; 1049 } 1050 /* 1051 * If at end of rpc data, get the eof boolean 1052 */ 1053 if (!more_dirs) { 1054 nfsm_disecton(p, u_long *, NFSX_UNSIGNED); 1055 eofflg = fxdr_unsigned(long, *p); 1056 } 1057 /* 1058 * If there is too much to fit in the data buffer, use savoff and 1059 * savdp to trim off the last record. 1060 * --> we are not at eof 1061 */ 1062 if (siz > uiop->uio_resid) { 1063 eofflg = FALSE; 1064 off = savoff; 1065 siz -= dp->d_reclen; 1066 dp = savdp; 1067 } 1068 if (siz > 0) { 1069 #ifdef notdef 1070 if (!eofflg) 1071 dp->d_reclen += (uiop->uio_resid-siz); 1072 #endif 1073 md = md2; 1074 dpos = dpos2; 1075 nfsm_mtouio(uiop, siz); 1076 #ifdef notdef 1077 if (!eofflg) 1078 uiop->uio_resid = 0; 1079 #endif 1080 *offp = off; 1081 } 1082 nfsm_reqdone; 1083 nfs_unlock(vp); 1084 return (error); 1085 } 1086 1087 /* 1088 * nfs statfs call 1089 * (Actually a vfsop, not a vnode op) 1090 */ 1091 nfs_statfs(mp, sbp) 1092 struct mount *mp; 1093 register struct statfs *sbp; 1094 { 1095 register struct vnode *vp; 1096 register struct nfsv2_statfs *sfp; 1097 register caddr_t cp; 1098 register long t1; 1099 caddr_t bpos, dpos, cp2; 1100 u_long xid; 1101 int error = 0; 1102 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1103 struct nfsmount *nmp; 1104 struct ucred *cred; 1105 struct nfsnode *np; 1106 1107 nmp = vfs_to_nfs(mp); 1108 if (error = nfs_nget(mp, &nmp->nm_fh, &np)) 1109 return (error); 1110 vp = NFSTOV(np); 1111 nfsstats.rpccnt[NFSPROC_STATFS]++; 1112 cred = crget(); 1113 cred->cr_ngroups = 1; 1114 nfsm_reqhead(nfs_procids[NFSPROC_STATFS], cred, NFSX_FH); 1115 nfsm_fhtom(vp); 1116 nfsm_request(vp); 1117 nfsm_disect(sfp, struct nfsv2_statfs *, NFSX_STATFS); 1118 sbp->f_type = MOUNT_NFS; 1119 sbp->f_bsize = fxdr_unsigned(long, sfp->sf_tsize); 1120 sbp->f_fsize = fxdr_unsigned(long, sfp->sf_bsize); 1121 sbp->f_blocks = fxdr_unsigned(long, sfp->sf_blocks); 1122 sbp->f_bfree = fxdr_unsigned(long, sfp->sf_bfree); 1123 sbp->f_bavail = fxdr_unsigned(long, sfp->sf_bavail); 1124 sbp->f_files = 0; 1125 sbp->f_ffree = 0; 1126 bcopy(nmp->nm_path, sbp->f_mntonname, MNAMELEN); 1127 bcopy(nmp->nm_host, sbp->f_mntfromname, MNAMELEN); 1128 nfsm_reqdone; 1129 nfs_nput(vp); 1130 crfree(cred); 1131 return (error); 1132 } 1133 1134 static char hextoasc[] = "0123456789abcdef"; 1135 1136 /* 1137 * Silly rename. To make the NFS filesystem that is stateless look a little 1138 * more like the "ufs" a remove of an active vnode is translated to a rename 1139 * to a funny looking filename that is removed by nfs_inactive on the 1140 * nfsnode. There is the potential for another process on a different client 1141 * to create the same funny name between the nfs_lookitup() fails and the 1142 * nfs_rename() completes, but... 1143 */ 1144 nfs_sillyrename(ndp, flag) 1145 register struct nameidata *ndp; 1146 int flag; 1147 { 1148 register struct nfsnode *np; 1149 register struct sillyrename *sp; 1150 register struct nameidata *tndp; 1151 int error; 1152 short pid; 1153 1154 np = VTONFS(ndp->ni_dvp); 1155 cache_purge(ndp->ni_dvp); 1156 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename), 1157 M_TEMP, M_WAITOK); 1158 sp->s_flag = flag; 1159 bcopy((caddr_t)&np->n_fh, (caddr_t)&sp->s_fh, NFSX_FH); 1160 np = VTONFS(ndp->ni_vp); 1161 tndp = &sp->s_namei; 1162 tndp->ni_cred = crdup(ndp->ni_cred); 1163 1164 /* Fudge together a funny name */ 1165 pid = u.u_procp->p_pid; 1166 bcopy(".nfsAxxxx4.4", tndp->ni_dent.d_name, 13); 1167 tndp->ni_dent.d_namlen = 12; 1168 tndp->ni_dent.d_name[8] = hextoasc[pid & 0xf]; 1169 tndp->ni_dent.d_name[7] = hextoasc[(pid >> 4) & 0xf]; 1170 tndp->ni_dent.d_name[6] = hextoasc[(pid >> 8) & 0xf]; 1171 tndp->ni_dent.d_name[5] = hextoasc[(pid >> 12) & 0xf]; 1172 1173 /* Try lookitups until we get one that isn't there */ 1174 while (nfs_lookitup(ndp->ni_dvp, tndp, (nfsv2fh_t *)0) == 0) { 1175 tndp->ni_dent.d_name[4]++; 1176 if (tndp->ni_dent.d_name[4] > 'z') { 1177 error = EINVAL; 1178 goto bad; 1179 } 1180 } 1181 if (error = nfs_renameit(ndp, tndp)) 1182 goto bad; 1183 nfs_lookitup(ndp->ni_dvp, tndp, &np->n_fh); 1184 np->n_sillyrename = sp; 1185 return (0); 1186 bad: 1187 crfree(tndp->ni_cred); 1188 free((caddr_t)sp, M_TEMP); 1189 return (error); 1190 } 1191 1192 /* 1193 * Look up a file name for silly rename stuff. 1194 * Just like nfs_lookup() except that it doesn't load returned values 1195 * into the nfsnode table. 1196 * If fhp != NULL it copies the returned file handle out 1197 */ 1198 nfs_lookitup(vp, ndp, fhp) 1199 register struct vnode *vp; 1200 register struct nameidata *ndp; 1201 nfsv2fh_t *fhp; 1202 { 1203 register u_long *p; 1204 register caddr_t cp; 1205 register long t1, t2; 1206 caddr_t bpos, dpos, cp2; 1207 u_long xid; 1208 int error = 0; 1209 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1210 long len; 1211 1212 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 1213 ndp->ni_dvp = vp; 1214 ndp->ni_vp = NULL; 1215 len = ndp->ni_dent.d_namlen; 1216 nfsm_reqhead(nfs_procids[NFSPROC_LOOKUP], ndp->ni_cred, NFSX_FH+NFSX_UNSIGNED+nfsm_rndup(len)); 1217 nfsm_fhtom(vp); 1218 nfsm_strtom(ndp->ni_dent.d_name, len, NFS_MAXNAMLEN); 1219 nfsm_request(vp); 1220 if (fhp != NULL) { 1221 nfsm_disect(cp, caddr_t, NFSX_FH); 1222 bcopy(cp, (caddr_t)fhp, NFSX_FH); 1223 } 1224 nfsm_reqdone; 1225 return (error); 1226 } 1227 1228 /* 1229 * Kludge City.. 1230 * - make nfs_bmap() essentially a no-op that does no translation 1231 * - do nfs_strategy() by faking physical I/O with nfs_readit/nfs_writeit 1232 * after mapping the physical addresses into Kernel Virtual space in the 1233 * nfsiobuf area. 1234 * (Maybe I could use the process's page mapping, but I was concerned that 1235 * Kernel Write might not be enabled and also figured copyout() would do 1236 * a lot more work than bcopy() and also it currently happens in the 1237 * context of the swapper process (2). 1238 */ 1239 nfs_bmap(vp, bn, vpp, bnp) 1240 struct vnode *vp; 1241 daddr_t bn; 1242 struct vnode **vpp; 1243 daddr_t *bnp; 1244 { 1245 if (vpp != NULL) 1246 *vpp = vp; 1247 if (bnp != NULL) 1248 *bnp = bn * btodb(vp->v_mount->m_bsize); 1249 return (0); 1250 } 1251 1252 /* 1253 * Strategy routine for phys. i/o 1254 * If the biod's are running, queue a request 1255 * otherwise just call nfs_doio() to get it done 1256 */ 1257 nfs_strategy(bp) 1258 register struct buf *bp; 1259 { 1260 register struct buf *dp; 1261 register int i; 1262 struct proc *rp; 1263 int error = 0; 1264 int fnd = 0; 1265 1266 /* 1267 * If an i/o daemon is waiting 1268 * queue the request, wake it up and wait for completion 1269 * otherwise just do it ourselves 1270 */ 1271 for (i = 0; i < nfs_asyncdaemons; i++) { 1272 if (rp = nfs_iodwant[i]) { 1273 /* 1274 * Ensure that the async_daemon is still waiting here 1275 */ 1276 if (rp->p_stat != SSLEEP || 1277 rp->p_wchan != ((caddr_t)&nfs_iodwant[i])) { 1278 nfs_iodwant[i] = (struct proc *)0; 1279 continue; 1280 } 1281 dp = &nfs_bqueue; 1282 if (dp->b_actf == NULL) { 1283 dp->b_actl = bp; 1284 bp->b_actf = dp; 1285 } else { 1286 dp->b_actf->b_actl = bp; 1287 bp->b_actf = dp->b_actf; 1288 } 1289 dp->b_actf = bp; 1290 bp->b_actl = dp; 1291 fnd++; 1292 nfs_iodwant[i] = (struct proc *)0; 1293 wakeup((caddr_t)&nfs_iodwant[i]); 1294 break; 1295 } 1296 } 1297 if (!fnd) 1298 error = nfs_doio(bp); 1299 return (error); 1300 } 1301 1302 /* 1303 * Fun and games with i/o 1304 * Essentially play ubasetup() and disk interrupt service routine by 1305 * mapping the data buffer into kernel virtual space and doing the 1306 * nfs read or write rpc's from it. 1307 * If the biod's are not running, this is just called from nfs_strategy(), 1308 * otherwise it is called by the biod's to do what would normally be 1309 * partially disk interrupt driven. 1310 */ 1311 nfs_doio(bp) 1312 register struct buf *bp; 1313 { 1314 register struct pte *pte, *ppte; 1315 register caddr_t vaddr; 1316 register struct uio *uiop; 1317 register struct vnode *vp; 1318 struct nfsnode *np; 1319 struct ucred *cr; 1320 int npf, npf2; 1321 int reg; 1322 caddr_t vbase; 1323 caddr_t addr; 1324 unsigned v; 1325 struct proc *rp; 1326 int o, error; 1327 int bcnt; 1328 off_t off; 1329 struct uio uio; 1330 struct iovec io; 1331 1332 vp = bp->b_vp; 1333 uiop = &uio; 1334 uiop->uio_iov = &io; 1335 uiop->uio_iovcnt = 1; 1336 uiop->uio_segflg = UIO_SYSSPACE; 1337 if (bp->b_flags & B_READ) { 1338 io.iov_len = uiop->uio_resid = bp->b_bcount; 1339 uiop->uio_offset = off = bp->b_blkno*DEV_BSIZE; 1340 addr = bp->b_un.b_addr; 1341 bcnt = bp->b_bcount; 1342 } else { 1343 io.iov_len = uiop->uio_resid = bp->b_dirtyend-bp->b_dirtyoff; 1344 uiop->uio_offset = off = (bp->b_blkno*DEV_BSIZE)+bp->b_dirtyoff; 1345 addr = bp->b_un.b_addr+bp->b_dirtyoff; 1346 bcnt = bp->b_dirtyend-bp->b_dirtyoff; 1347 } 1348 /* 1349 * For phys i/o, map the b_addr into kernel virtual space using 1350 * the Nfsiomap pte's 1351 * Also, add a temporary b_rcred for reading using the process's uid 1352 * and a guess at a group 1353 */ 1354 if (bp->b_flags & B_PHYS) { 1355 VTONFS(vp)->n_flag |= NPAGEDON; 1356 bp->b_rcred = cr = crget(); 1357 rp = (bp->b_flags & B_DIRTY) ? &proc[2] : bp->b_proc; 1358 cr->cr_uid = rp->p_uid; 1359 cr->cr_gid = 0; /* Anything ?? */ 1360 cr->cr_ngroups = 1; 1361 o = (int)addr & PGOFSET; 1362 npf2 = npf = btoc(bcnt + o); 1363 /* 1364 * Get some mapping page table entries 1365 */ 1366 while ((reg = rmalloc(nfsmap, (long)npf)) == 0) { 1367 nfsmap_want++; 1368 sleep((caddr_t)&nfsmap_want, PZERO-1); 1369 } 1370 reg--; 1371 /* I know it is always the else, but that may change someday */ 1372 if ((bp->b_flags & B_PHYS) == 0) 1373 pte = kvtopte(bp->b_un.b_addr); 1374 else if (bp->b_flags & B_PAGET) 1375 pte = &Usrptmap[btokmx((struct pte *)bp->b_un.b_addr)]; 1376 else { 1377 v = btop(bp->b_un.b_addr); 1378 if (bp->b_flags & B_UAREA) 1379 pte = &rp->p_addr[v]; 1380 else 1381 pte = vtopte(rp, v); 1382 } 1383 /* 1384 * Play vmaccess() but with the Nfsiomap page table 1385 */ 1386 ppte = &Nfsiomap[reg]; 1387 vbase = vaddr = &nfsiobuf[reg*NBPG]; 1388 while (npf != 0) { 1389 mapin(ppte, (u_int)vaddr, pte->pg_pfnum, (int)(PG_V|PG_KW)); 1390 #if defined(tahoe) 1391 mtpr(P1DC, vaddr); 1392 #endif 1393 ppte++; 1394 pte++; 1395 vaddr += NBPG; 1396 --npf; 1397 } 1398 io.iov_base = vbase+o; 1399 } else { 1400 io.iov_base = addr; 1401 } 1402 if (bp->b_flags & B_READ) { 1403 uiop->uio_rw = UIO_READ; 1404 bp->b_error = error = nfs_readrpc(vp, uiop, &off, bp->b_rcred); 1405 } else { 1406 uiop->uio_rw = UIO_WRITE; 1407 bp->b_error = error = nfs_writerpc(vp, uiop, &off, bp->b_wcred); 1408 if (error) { 1409 np = VTONFS(vp); 1410 np->n_error = error; 1411 np->n_flag |= NWRITEERR; 1412 } 1413 bp->b_dirtyoff = bp->b_dirtyend = 0; 1414 } 1415 if (error) 1416 bp->b_flags |= B_ERROR; 1417 bp->b_resid = uiop->uio_resid; 1418 /* 1419 * Release pte's used by physical i/o 1420 */ 1421 if (bp->b_flags & B_PHYS) { 1422 crfree(cr); 1423 rmfree(nfsmap, (long)npf2, (long)++reg); 1424 if (nfsmap_want) { 1425 nfsmap_want = 0; 1426 wakeup((caddr_t)&nfsmap_want); 1427 } 1428 } 1429 biodone(bp); 1430 return (error); 1431 } 1432 1433 /* 1434 * Flush all the blocks associated with a vnode. 1435 * Walk through the buffer pool and push any dirty pages 1436 * associated with the vnode. 1437 */ 1438 /* ARGSUSED */ 1439 nfs_fsync(vp, fflags, cred) 1440 register struct vnode *vp; 1441 int fflags; 1442 struct ucred *cred; 1443 { 1444 register struct nfsnode *np = VTONFS(vp); 1445 int error; 1446 1447 nfs_lock(vp); 1448 if (np->n_flag & NMODIFIED) { 1449 np->n_flag &= ~NMODIFIED; 1450 error = nfs_blkflush(vp, (daddr_t)0, np->n_size, FALSE); 1451 } 1452 nfs_unlock(vp); 1453 return (error); 1454 } 1455