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 7.22 (Berkeley) 01/04/90 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 nfs_print(); 90 91 struct vnodeops nfsv2_vnodeops = { 92 nfs_lookup, /* lookup */ 93 nfs_create, /* create */ 94 nfs_mknod, /* mknod */ 95 nfs_open, /* open */ 96 nfs_close, /* close */ 97 nfs_access, /* access */ 98 nfs_getattr, /* getattr */ 99 nfs_setattr, /* setattr */ 100 nfs_read, /* read */ 101 nfs_write, /* write */ 102 vfs_noop, /* ioctl */ 103 vfs_noop, /* select */ 104 vfs_noop, /* mmap */ 105 nfs_fsync, /* fsync */ 106 vfs_nullop, /* seek */ 107 nfs_remove, /* remove */ 108 nfs_link, /* link */ 109 nfs_rename, /* rename */ 110 nfs_mkdir, /* mkdir */ 111 nfs_rmdir, /* rmdir */ 112 nfs_symlink, /* symlink */ 113 nfs_readdir, /* readdir */ 114 nfs_readlink, /* readlink */ 115 nfs_abortop, /* abortop */ 116 nfs_inactive, /* inactive */ 117 nfs_reclaim, /* reclaim */ 118 nfs_lock, /* lock */ 119 nfs_unlock, /* unlock */ 120 nfs_bmap, /* bmap */ 121 nfs_strategy, /* strategy */ 122 nfs_print, /* print */ 123 }; 124 125 /* Special device vnode ops */ 126 int spec_lookup(), 127 spec_open(), 128 spec_read(), 129 spec_write(), 130 spec_strategy(), 131 spec_bmap(), 132 spec_ioctl(), 133 spec_select(), 134 spec_close(), 135 spec_badop(), 136 spec_nullop(); 137 138 struct vnodeops spec_nfsv2nodeops = { 139 spec_lookup, /* lookup */ 140 spec_badop, /* create */ 141 spec_badop, /* mknod */ 142 spec_open, /* open */ 143 spec_close, /* close */ 144 nfs_access, /* access */ 145 nfs_getattr, /* getattr */ 146 nfs_setattr, /* setattr */ 147 spec_read, /* read */ 148 spec_write, /* write */ 149 spec_ioctl, /* ioctl */ 150 spec_select, /* select */ 151 spec_badop, /* mmap */ 152 spec_nullop, /* fsync */ 153 spec_badop, /* seek */ 154 spec_badop, /* remove */ 155 spec_badop, /* link */ 156 spec_badop, /* rename */ 157 spec_badop, /* mkdir */ 158 spec_badop, /* rmdir */ 159 spec_badop, /* symlink */ 160 spec_badop, /* readdir */ 161 spec_badop, /* readlink */ 162 spec_badop, /* abortop */ 163 nfs_inactive, /* inactive */ 164 nfs_reclaim, /* reclaim */ 165 nfs_lock, /* lock */ 166 nfs_unlock, /* unlock */ 167 spec_bmap, /* bmap */ 168 spec_strategy, /* strategy */ 169 nfs_print, /* print */ 170 }; 171 172 extern u_long nfs_procids[NFS_NPROCS]; 173 extern u_long nfs_prog, nfs_vers; 174 extern char nfsiobuf[MAXPHYS+NBPG]; 175 struct map nfsmap[NFS_MSIZ]; 176 enum vtype v_type[NFLNK+1]; 177 struct buf nfs_bqueue; /* Queue head for nfsiod's */ 178 int nfs_asyncdaemons = 0; 179 struct proc *nfs_iodwant[MAX_ASYNCDAEMON]; 180 static int nfsmap_want = 0; 181 182 /* 183 * nfs null call from vfs. 184 */ 185 nfs_null(vp, cred) 186 struct vnode *vp; 187 struct ucred *cred; 188 { 189 caddr_t bpos, dpos; 190 u_long xid; 191 int error = 0; 192 struct mbuf *mreq, *mrep, *md, *mb; 193 194 nfsm_reqhead(nfs_procids[NFSPROC_NULL], cred, 0); 195 nfsm_request(vp); 196 nfsm_reqdone; 197 return (error); 198 } 199 200 /* 201 * nfs access vnode op. 202 * Essentially just get vattr and then imitate iaccess() 203 */ 204 nfs_access(vp, mode, cred) 205 struct vnode *vp; 206 int mode; 207 register struct ucred *cred; 208 { 209 register struct vattr *vap; 210 register gid_t *gp; 211 struct vattr vattr; 212 register int i; 213 int error; 214 215 /* 216 * If you're the super-user, 217 * you always get access. 218 */ 219 if (cred->cr_uid == 0) 220 return (0); 221 vap = &vattr; 222 if (error = nfs_getattr(vp, vap, cred)) 223 return (error); 224 /* 225 * Access check is based on only one of owner, group, public. 226 * If not owner, then check group. If not a member of the 227 * group, then check public access. 228 */ 229 if (cred->cr_uid != vap->va_uid) { 230 mode >>= 3; 231 gp = cred->cr_groups; 232 for (i = 0; i < cred->cr_ngroups; i++, gp++) 233 if (vap->va_gid == *gp) 234 goto found; 235 mode >>= 3; 236 found: 237 ; 238 } 239 if ((vap->va_mode & mode) != 0) 240 return (0); 241 return (EACCES); 242 } 243 244 /* 245 * nfs open vnode op 246 * Just check to see if the type is ok 247 */ 248 /* ARGSUSED */ 249 nfs_open(vp, mode, cred) 250 struct vnode *vp; 251 int mode; 252 struct ucred *cred; 253 { 254 register enum vtype vtyp; 255 256 vtyp = vp->v_type; 257 if (vtyp == VREG || vtyp == VDIR || vtyp == VLNK) 258 return (0); 259 else 260 return (EACCES); 261 } 262 263 /* 264 * nfs close vnode op 265 * For reg files, invalidate any buffer cache entries. 266 */ 267 /* ARGSUSED */ 268 nfs_close(vp, fflags, cred) 269 register struct vnode *vp; 270 int fflags; 271 struct ucred *cred; 272 { 273 register struct nfsnode *np = VTONFS(vp); 274 int error = 0; 275 276 if (vp->v_type == VREG && ((np->n_flag & NMODIFIED) || 277 ((np->n_flag & NBUFFERED) && np->n_sillyrename))) { 278 nfs_lock(vp); 279 np->n_flag &= ~(NMODIFIED|NBUFFERED); 280 vinvalbuf(vp, TRUE); 281 if (np->n_flag & NWRITEERR) { 282 np->n_flag &= ~NWRITEERR; 283 error = np->n_error; 284 } 285 nfs_unlock(vp); 286 } 287 return (error); 288 } 289 290 /* 291 * nfs getattr call from vfs. 292 */ 293 nfs_getattr(vp, vap, cred) 294 register struct vnode *vp; 295 struct vattr *vap; 296 struct ucred *cred; 297 { 298 register caddr_t cp; 299 register long t1; 300 caddr_t bpos, dpos; 301 u_long xid; 302 int error = 0; 303 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 304 305 /* First look in the cache.. */ 306 if (nfs_getattrcache(vp, vap) == 0) 307 return (0); 308 nfsstats.rpccnt[NFSPROC_GETATTR]++; 309 nfsm_reqhead(nfs_procids[NFSPROC_GETATTR], cred, NFSX_FH); 310 nfsm_fhtom(vp); 311 nfsm_request(vp); 312 nfsm_loadattr(vp, vap); 313 nfsm_reqdone; 314 return (error); 315 } 316 317 /* 318 * nfs setattr call. 319 */ 320 nfs_setattr(vp, vap, cred) 321 register struct vnode *vp; 322 register struct vattr *vap; 323 struct ucred *cred; 324 { 325 register struct nfsv2_sattr *sp; 326 register caddr_t cp; 327 register long t1; 328 caddr_t bpos, dpos; 329 u_long xid; 330 int error = 0; 331 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 332 struct nfsnode *np; 333 334 nfsstats.rpccnt[NFSPROC_SETATTR]++; 335 nfsm_reqhead(nfs_procids[NFSPROC_SETATTR], cred, NFSX_FH+NFSX_SATTR); 336 nfsm_fhtom(vp); 337 nfsm_build(sp, struct nfsv2_sattr *, NFSX_SATTR); 338 if (vap->va_mode == 0xffff) 339 sp->sa_mode = VNOVAL; 340 else 341 sp->sa_mode = vtonfs_mode(vp->v_type, vap->va_mode); 342 if (vap->va_uid == 0xffff) 343 sp->sa_uid = VNOVAL; 344 else 345 sp->sa_uid = txdr_unsigned(vap->va_uid); 346 if (vap->va_gid == 0xffff) 347 sp->sa_gid = VNOVAL; 348 else 349 sp->sa_gid = txdr_unsigned(vap->va_gid); 350 sp->sa_size = txdr_unsigned(vap->va_size); 351 if (vap->va_size != VNOVAL) { 352 np = VTONFS(vp); 353 if (np->n_flag & NMODIFIED) { 354 np->n_flag &= ~NMODIFIED; 355 vinvalbuf(vp, TRUE); 356 } 357 } 358 sp->sa_atime.tv_sec = txdr_unsigned(vap->va_atime.tv_sec); 359 sp->sa_atime.tv_usec = txdr_unsigned(vap->va_flags); 360 txdr_time(&vap->va_mtime, &sp->sa_mtime); 361 nfsm_request(vp); 362 nfsm_loadattr(vp, (struct vattr *)0); 363 /* should we fill in any vap fields ?? */ 364 nfsm_reqdone; 365 return (error); 366 } 367 368 /* 369 * nfs lookup call, one step at a time... 370 * First look in cache 371 * If not found, unlock the directory nfsnode and do the rpc 372 */ 373 nfs_lookup(vp, ndp) 374 register struct vnode *vp; 375 register struct nameidata *ndp; 376 { 377 register struct vnode *vdp; 378 register u_long *p; 379 register caddr_t cp; 380 register long t1, t2; 381 caddr_t bpos, dpos, cp2; 382 u_long xid; 383 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 384 struct vnode *newvp; 385 long len; 386 nfsv2fh_t *fhp; 387 struct nfsnode *np; 388 int lockparent, wantparent, flag, error = 0; 389 390 ndp->ni_dvp = vp; 391 ndp->ni_vp = NULL; 392 if (vp->v_type != VDIR) 393 return (ENOTDIR); 394 lockparent = ndp->ni_nameiop & LOCKPARENT; 395 flag = ndp->ni_nameiop & OPFLAG; 396 wantparent = ndp->ni_nameiop & (LOCKPARENT|WANTPARENT); 397 if ((error = cache_lookup(ndp)) && error != ENOENT) { 398 struct vattr vattr; 399 int vpid; 400 401 if (vp == ndp->ni_rdir && ndp->ni_isdotdot) 402 panic("nfs_lookup: .. through root"); 403 vdp = ndp->ni_vp; 404 vpid = vdp->v_id; 405 /* 406 * See the comment starting `Step through' in ufs/ufs_lookup.c 407 * for an explanation of the locking protocol 408 */ 409 if (vp == vdp) { 410 VREF(vdp); 411 error = 0; 412 } else if (ndp->ni_isdotdot) { 413 nfs_unlock(vp); 414 error = vget(vdp); 415 } else { 416 error = vget(vdp); 417 nfs_unlock(vp); 418 } 419 if (!error) { 420 if (vpid == vdp->v_id && 421 !nfs_getattr(vdp, &vattr, ndp->ni_cred)) { 422 nfsstats.lookupcache_hits++; 423 return (0); 424 } else { 425 nfs_nput(vdp); 426 } 427 } 428 ndp->ni_vp = (struct vnode *)0; 429 } else 430 nfs_unlock(vp); 431 error = 0; 432 nfsstats.lookupcache_misses++; 433 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 434 len = ndp->ni_namelen; 435 nfsm_reqhead(nfs_procids[NFSPROC_LOOKUP], ndp->ni_cred, NFSX_FH+NFSX_UNSIGNED+nfsm_rndup(len)); 436 nfsm_fhtom(vp); 437 nfsm_strtom(ndp->ni_ptr, len, NFS_MAXNAMLEN); 438 nfsm_request(vp); 439 nfsmout: 440 if (error) { 441 if (lockparent || (flag != CREATE && flag != RENAME) || 442 *ndp->ni_next != 0) 443 nfs_lock(vp); 444 return (ENOENT); 445 } 446 nfsm_disect(fhp,nfsv2fh_t *,NFSX_FH); 447 448 /* 449 * Handle DELETE and RENAME cases... 450 */ 451 if (flag == DELETE && *ndp->ni_next == 0) { 452 if (!bcmp(VTONFS(vp)->n_fh.fh_bytes, (caddr_t)fhp, NFSX_FH)) { 453 VREF(vp); 454 newvp = vp; 455 np = VTONFS(vp); 456 } else { 457 if (error = nfs_nget(vp->v_mount, fhp, &np)) { 458 nfs_lock(vp); 459 m_freem(mrep); 460 return (error); 461 } 462 newvp = NFSTOV(np); 463 } 464 if (error = 465 nfs_loadattrcache(&newvp, &md, &dpos, (struct vattr *)0)) { 466 nfs_lock(vp); 467 if (newvp != vp) 468 nfs_nput(newvp); 469 else 470 vrele(vp); 471 m_freem(mrep); 472 return (error); 473 } 474 ndp->ni_vp = newvp; 475 if (lockparent || vp == newvp) 476 nfs_lock(vp); 477 m_freem(mrep); 478 return (0); 479 } 480 481 if (flag == RENAME && wantparent && *ndp->ni_next == 0) { 482 if (!bcmp(VTONFS(vp)->n_fh.fh_bytes, (caddr_t)fhp, NFSX_FH)) { 483 nfs_lock(vp); 484 m_freem(mrep); 485 return (EISDIR); 486 } 487 if (error = nfs_nget(vp->v_mount, fhp, &np)) { 488 nfs_lock(vp); 489 m_freem(mrep); 490 return (error); 491 } 492 newvp = NFSTOV(np); 493 if (error = 494 nfs_loadattrcache(&newvp, &md, &dpos, (struct vattr *)0)) { 495 nfs_lock(vp); 496 nfs_nput(newvp); 497 m_freem(mrep); 498 return (error); 499 } 500 ndp->ni_vp = newvp; 501 if (lockparent) 502 nfs_lock(vp); 503 return (0); 504 } 505 506 if (!bcmp(VTONFS(vp)->n_fh.fh_bytes, (caddr_t)fhp, NFSX_FH)) { 507 VREF(vp); 508 newvp = vp; 509 np = VTONFS(vp); 510 } else if (ndp->ni_isdotdot) { 511 if (error = nfs_nget(vp->v_mount, fhp, &np)) { 512 nfs_lock(vp); 513 m_freem(mrep); 514 return (error); 515 } 516 newvp = NFSTOV(np); 517 } else { 518 if (error = nfs_nget(vp->v_mount, fhp, &np)) { 519 nfs_lock(vp); 520 m_freem(mrep); 521 return (error); 522 } 523 newvp = NFSTOV(np); 524 } 525 if (error = nfs_loadattrcache(&newvp, &md, &dpos, (struct vattr *)0)) { 526 nfs_lock(vp); 527 if (newvp != vp) 528 nfs_nput(newvp); 529 else 530 vrele(vp); 531 m_freem(mrep); 532 return (error); 533 } 534 m_freem(mrep); 535 536 if (vp == newvp || (lockparent && *ndp->ni_next == '\0')) 537 nfs_lock(vp); 538 ndp->ni_vp = newvp; 539 if (error == 0 && ndp->ni_makeentry) 540 cache_enter(ndp); 541 return (error); 542 } 543 544 /* 545 * nfs readlink call 546 */ 547 nfs_readlink(vp, uiop, cred) 548 register struct vnode *vp; 549 struct uio *uiop; 550 struct ucred *cred; 551 { 552 register u_long *p; 553 register caddr_t cp; 554 register long t1; 555 caddr_t bpos, dpos, cp2; 556 u_long xid; 557 int error = 0; 558 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 559 long len; 560 561 nfsstats.rpccnt[NFSPROC_READLINK]++; 562 nfsm_reqhead(nfs_procids[NFSPROC_READLINK], cred, NFSX_FH); 563 nfsm_fhtom(vp); 564 nfsm_request(vp); 565 nfsm_strsiz(len, NFS_MAXPATHLEN); 566 nfsm_mtouio(uiop, len); 567 nfsm_reqdone; 568 return (error); 569 } 570 571 /* 572 * nfs read call 573 */ 574 nfs_readrpc(vp, uiop, cred) 575 register struct vnode *vp; 576 struct uio *uiop; 577 struct ucred *cred; 578 { 579 register u_long *p; 580 register caddr_t cp; 581 register long t1; 582 caddr_t bpos, dpos, cp2; 583 u_long xid; 584 int error = 0; 585 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 586 struct nfsmount *nmp; 587 long len, retlen, tsiz; 588 589 nmp = vfs_to_nfs(vp->v_mount); 590 tsiz = uiop->uio_resid; 591 while (tsiz > 0) { 592 nfsstats.rpccnt[NFSPROC_READ]++; 593 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz; 594 nfsm_reqhead(nfs_procids[NFSPROC_READ], cred, NFSX_FH+NFSX_UNSIGNED*3); 595 nfsm_fhtom(vp); 596 nfsm_build(p, u_long *, NFSX_UNSIGNED*3); 597 *p++ = txdr_unsigned(uiop->uio_offset); 598 *p++ = txdr_unsigned(len); 599 *p = 0; 600 nfsm_request(vp); 601 nfsm_loadattr(vp, (struct vattr *)0); 602 nfsm_strsiz(retlen, nmp->nm_rsize); 603 nfsm_mtouio(uiop, retlen); 604 m_freem(mrep); 605 if (retlen < len) 606 tsiz = 0; 607 else 608 tsiz -= len; 609 } 610 nfsmout: 611 return (error); 612 } 613 614 /* 615 * nfs write call 616 */ 617 nfs_writerpc(vp, uiop, cred) 618 register struct vnode *vp; 619 struct uio *uiop; 620 struct ucred *cred; 621 { 622 register u_long *p; 623 register caddr_t cp; 624 register long t1; 625 caddr_t bpos, dpos; 626 u_long xid; 627 int error = 0; 628 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 629 struct nfsmount *nmp; 630 long len, tsiz; 631 632 nmp = vfs_to_nfs(vp->v_mount); 633 tsiz = uiop->uio_resid; 634 while (tsiz > 0) { 635 nfsstats.rpccnt[NFSPROC_WRITE]++; 636 len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz; 637 nfsm_reqhead(nfs_procids[NFSPROC_WRITE], cred, 638 NFSX_FH+NFSX_UNSIGNED*4); 639 nfsm_fhtom(vp); 640 nfsm_build(p, u_long *, NFSX_UNSIGNED*4); 641 *(p+1) = txdr_unsigned(uiop->uio_offset); 642 *(p+3) = txdr_unsigned(len); 643 nfsm_uiotom(uiop, len); 644 nfsm_request(vp); 645 nfsm_loadattr(vp, (struct vattr *)0); 646 m_freem(mrep); 647 tsiz -= len; 648 } 649 nfsmout: 650 return (error); 651 } 652 653 /* 654 * nfs mknod call 655 * This call is currently not supported. 656 */ 657 /* ARGSUSED */ 658 nfs_mknod(ndp, vap, cred) 659 struct nameidata *ndp; 660 struct ucred *cred; 661 struct vattr *vap; 662 { 663 664 nfs_abortop(ndp); 665 return (EOPNOTSUPP); 666 } 667 668 /* 669 * nfs file create call 670 */ 671 nfs_create(ndp, vap) 672 register struct nameidata *ndp; 673 register struct vattr *vap; 674 { 675 register struct nfsv2_sattr *sp; 676 register u_long *p; 677 register caddr_t cp; 678 register long t1, t2; 679 caddr_t bpos, dpos, cp2; 680 u_long xid; 681 int error = 0; 682 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 683 684 nfsstats.rpccnt[NFSPROC_CREATE]++; 685 nfsm_reqhead(nfs_procids[NFSPROC_CREATE], ndp->ni_cred, 686 NFSX_FH+NFSX_UNSIGNED+nfsm_rndup(ndp->ni_dent.d_namlen)+NFSX_SATTR); 687 nfsm_fhtom(ndp->ni_dvp); 688 nfsm_strtom(ndp->ni_dent.d_name, ndp->ni_dent.d_namlen, NFS_MAXNAMLEN); 689 nfsm_build(sp, struct nfsv2_sattr *, NFSX_SATTR); 690 sp->sa_mode = vtonfs_mode(VREG, vap->va_mode); 691 sp->sa_uid = txdr_unsigned(ndp->ni_cred->cr_uid); 692 sp->sa_gid = txdr_unsigned(ndp->ni_cred->cr_gid); 693 sp->sa_size = txdr_unsigned(0); 694 /* or should these be VNOVAL ?? */ 695 txdr_time(&vap->va_atime, &sp->sa_atime); 696 txdr_time(&vap->va_mtime, &sp->sa_mtime); 697 nfsm_request(ndp->ni_dvp); 698 nfsm_mtofh(ndp->ni_dvp, ndp->ni_vp); 699 nfsm_reqdone; 700 nfs_nput(ndp->ni_dvp); 701 return (error); 702 } 703 704 /* 705 * nfs file remove call 706 * To try and make nfs semantics closer to vfs semantics, a file that has 707 * other references to the vnode is renamed instead of removed and then 708 * removed later on the last close. 709 * Unfortunately you must flush the buffer cache and cmap to get rid of 710 * all extraneous vnode references before you check the reference cnt. 711 * 1 - If the file could have blocks in the buffer cache 712 * flush them out and invalidate them 713 * mpurge the vnode to flush out cmap references 714 * (This is necessary to update the vnode ref cnt as well as sensible 715 * for actual removes, to free up the buffers) 716 * 2 - If v_usecount > 1 717 * If a rename is not already in the works 718 * call nfs_sillyrename() to set it up 719 * else 720 * do the remove rpc 721 */ 722 nfs_remove(ndp) 723 register struct nameidata *ndp; 724 { 725 register struct vnode *vp = ndp->ni_vp; 726 register struct nfsnode *np = VTONFS(ndp->ni_vp); 727 register u_long *p; 728 register caddr_t cp; 729 register long t1, t2; 730 caddr_t bpos, dpos; 731 u_long xid; 732 int error = 0; 733 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 734 735 if (vp->v_type == VREG) { 736 if (np->n_flag & (NMODIFIED|NBUFFERED)) { 737 np->n_flag &= ~(NMODIFIED|NBUFFERED); 738 vinvalbuf(vp, TRUE); 739 } 740 if (np->n_flag & NPAGEDON) { 741 np->n_flag &= ~NPAGEDON; 742 mpurge(vp); /* In case cmap entries still ref it */ 743 } 744 } 745 if (vp->v_usecount > 1) { 746 if (!np->n_sillyrename) 747 error = nfs_sillyrename(ndp, REMOVE); 748 } else { 749 nfsstats.rpccnt[NFSPROC_REMOVE]++; 750 nfsm_reqhead(nfs_procids[NFSPROC_REMOVE], ndp->ni_cred, 751 NFSX_FH+NFSX_UNSIGNED+nfsm_rndup(ndp->ni_dent.d_namlen)); 752 nfsm_fhtom(ndp->ni_dvp); 753 nfsm_strtom(ndp->ni_dent.d_name, ndp->ni_dent.d_namlen, NFS_MAXNAMLEN); 754 nfsm_request(ndp->ni_dvp); 755 nfsm_reqdone; 756 /* 757 * Kludge City: If the first reply to the remove rpc is lost.. 758 * the reply to the retransmitted request will be ENOENT 759 * since the file was in fact removed 760 * Therefore, we cheat and return success. 761 */ 762 if (error == ENOENT) 763 error = 0; 764 } 765 if (ndp->ni_dvp == ndp->ni_vp) 766 vrele(ndp->ni_vp); 767 else 768 nfs_nput(ndp->ni_vp); 769 nfs_nput(ndp->ni_dvp); 770 return (error); 771 } 772 773 /* 774 * nfs file remove rpc called from nfs_inactive 775 */ 776 nfs_removeit(ndp) 777 register struct nameidata *ndp; 778 { 779 register u_long *p; 780 register caddr_t cp; 781 register long t1, t2; 782 caddr_t bpos, dpos; 783 u_long xid; 784 int error = 0; 785 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 786 787 nfsstats.rpccnt[NFSPROC_REMOVE]++; 788 nfsm_reqhead(nfs_procids[NFSPROC_REMOVE], ndp->ni_cred, 789 NFSX_FH+NFSX_UNSIGNED+nfsm_rndup(ndp->ni_dent.d_namlen)); 790 nfsm_fhtom(ndp->ni_dvp); 791 nfsm_strtom(ndp->ni_dent.d_name, ndp->ni_dent.d_namlen, NFS_MAXNAMLEN); 792 nfsm_request(ndp->ni_dvp); 793 nfsm_reqdone; 794 return (error); 795 } 796 797 /* 798 * nfs file rename call 799 */ 800 nfs_rename(sndp, tndp) 801 register struct nameidata *sndp, *tndp; 802 { 803 register u_long *p; 804 register caddr_t cp; 805 register long t1, t2; 806 caddr_t bpos, dpos; 807 u_long xid; 808 int error = 0; 809 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 810 811 nfsstats.rpccnt[NFSPROC_RENAME]++; 812 nfsm_reqhead(nfs_procids[NFSPROC_RENAME], tndp->ni_cred, 813 (NFSX_FH+NFSX_UNSIGNED)*2+nfsm_rndup(sndp->ni_dent.d_namlen)+ 814 nfsm_rndup(tndp->ni_dent.d_namlen)); /* or sndp->ni_cred?*/ 815 nfsm_fhtom(sndp->ni_dvp); 816 nfsm_strtom(sndp->ni_dent.d_name,sndp->ni_dent.d_namlen,NFS_MAXNAMLEN); 817 nfsm_fhtom(tndp->ni_dvp); 818 nfsm_strtom(tndp->ni_dent.d_name,tndp->ni_dent.d_namlen,NFS_MAXNAMLEN); 819 nfsm_request(sndp->ni_dvp); 820 nfsm_reqdone; 821 if (sndp->ni_vp->v_type == VDIR) { 822 if (tndp->ni_vp != NULL && tndp->ni_vp->v_type == VDIR) 823 cache_purge(tndp->ni_dvp); 824 cache_purge(sndp->ni_dvp); 825 } 826 nfs_abortop(sndp); 827 nfs_abortop(tndp); 828 return (error); 829 } 830 831 /* 832 * nfs file rename rpc called from above 833 */ 834 nfs_renameit(sndp, tndp) 835 register struct nameidata *sndp, *tndp; 836 { 837 register u_long *p; 838 register caddr_t cp; 839 register long t1, t2; 840 caddr_t bpos, dpos; 841 u_long xid; 842 int error = 0; 843 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 844 845 nfsstats.rpccnt[NFSPROC_RENAME]++; 846 nfsm_reqhead(nfs_procids[NFSPROC_RENAME], tndp->ni_cred, 847 (NFSX_FH+NFSX_UNSIGNED)*2+nfsm_rndup(sndp->ni_dent.d_namlen)+ 848 nfsm_rndup(tndp->ni_dent.d_namlen)); /* or sndp->ni_cred?*/ 849 nfsm_fhtom(sndp->ni_dvp); 850 nfsm_strtom(sndp->ni_dent.d_name,sndp->ni_dent.d_namlen,NFS_MAXNAMLEN); 851 nfsm_fhtom(tndp->ni_dvp); 852 nfsm_strtom(tndp->ni_dent.d_name,tndp->ni_dent.d_namlen,NFS_MAXNAMLEN); 853 nfsm_request(sndp->ni_dvp); 854 nfsm_reqdone; 855 return (error); 856 } 857 858 /* 859 * nfs hard link create call 860 */ 861 nfs_link(vp, ndp) 862 register struct vnode *vp; 863 register struct nameidata *ndp; 864 { 865 register u_long *p; 866 register caddr_t cp; 867 register long t1, t2; 868 caddr_t bpos, dpos; 869 u_long xid; 870 int error = 0; 871 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 872 873 if (ndp->ni_dvp != vp) 874 nfs_lock(vp); 875 nfsstats.rpccnt[NFSPROC_LINK]++; 876 nfsm_reqhead(nfs_procids[NFSPROC_LINK], ndp->ni_cred, 877 NFSX_FH*2+NFSX_UNSIGNED+nfsm_rndup(ndp->ni_dent.d_namlen)); 878 nfsm_fhtom(vp); 879 nfsm_fhtom(ndp->ni_dvp); 880 nfsm_strtom(ndp->ni_dent.d_name, ndp->ni_dent.d_namlen, NFS_MAXNAMLEN); 881 nfsm_request(vp); 882 nfsm_reqdone; 883 if (ndp->ni_dvp != vp) 884 nfs_unlock(vp); 885 nfs_nput(ndp->ni_dvp); 886 return (error); 887 } 888 889 /* 890 * nfs symbolic link create call 891 */ 892 nfs_symlink(ndp, vap, nm) 893 struct nameidata *ndp; 894 struct vattr *vap; 895 char *nm; /* is this the path ?? */ 896 { 897 register struct nfsv2_sattr *sp; 898 register u_long *p; 899 register caddr_t cp; 900 register long t1, t2; 901 caddr_t bpos, dpos; 902 u_long xid; 903 int error = 0; 904 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 905 906 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 907 nfsm_reqhead(nfs_procids[NFSPROC_SYMLINK], ndp->ni_cred, 908 NFSX_FH+NFSX_UNSIGNED+nfsm_rndup(ndp->ni_dent.d_namlen)+NFSX_UNSIGNED); 909 nfsm_fhtom(ndp->ni_dvp); 910 nfsm_strtom(ndp->ni_dent.d_name, ndp->ni_dent.d_namlen, NFS_MAXNAMLEN); 911 nfsm_strtom(nm, strlen(nm), NFS_MAXPATHLEN); 912 nfsm_build(sp, struct nfsv2_sattr *, NFSX_SATTR); 913 sp->sa_mode = vtonfs_mode(VLNK, vap->va_mode); 914 sp->sa_uid = txdr_unsigned(ndp->ni_cred->cr_uid); 915 sp->sa_gid = txdr_unsigned(ndp->ni_cred->cr_gid); 916 sp->sa_size = txdr_unsigned(VNOVAL); 917 txdr_time(&vap->va_atime, &sp->sa_atime); /* or VNOVAL ?? */ 918 txdr_time(&vap->va_mtime, &sp->sa_mtime); /* or VNOVAL ?? */ 919 nfsm_request(ndp->ni_dvp); 920 nfsm_reqdone; 921 nfs_nput(ndp->ni_dvp); 922 return (error); 923 } 924 925 /* 926 * nfs make dir call 927 */ 928 nfs_mkdir(ndp, vap) 929 register struct nameidata *ndp; 930 struct vattr *vap; 931 { 932 register struct nfsv2_sattr *sp; 933 register u_long *p; 934 register caddr_t cp; 935 register long t1, t2; 936 caddr_t bpos, dpos, cp2; 937 u_long xid; 938 int error = 0; 939 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 940 941 nfsstats.rpccnt[NFSPROC_MKDIR]++; 942 nfsm_reqhead(nfs_procids[NFSPROC_MKDIR], ndp->ni_cred, 943 NFSX_FH+NFSX_UNSIGNED+nfsm_rndup(ndp->ni_dent.d_namlen)+NFSX_SATTR); 944 nfsm_fhtom(ndp->ni_dvp); 945 nfsm_strtom(ndp->ni_dent.d_name, ndp->ni_dent.d_namlen, NFS_MAXNAMLEN); 946 nfsm_build(sp, struct nfsv2_sattr *, NFSX_SATTR); 947 sp->sa_mode = vtonfs_mode(VDIR, vap->va_mode); 948 sp->sa_uid = txdr_unsigned(ndp->ni_cred->cr_uid); 949 sp->sa_gid = txdr_unsigned(ndp->ni_cred->cr_gid); 950 sp->sa_size = txdr_unsigned(VNOVAL); 951 txdr_time(&vap->va_atime, &sp->sa_atime); /* or VNOVAL ?? */ 952 txdr_time(&vap->va_mtime, &sp->sa_mtime); /* or VNOVAL ?? */ 953 nfsm_request(ndp->ni_dvp); 954 nfsm_mtofh(ndp->ni_dvp, ndp->ni_vp); 955 nfsm_reqdone; 956 nfs_nput(ndp->ni_dvp); 957 return (error); 958 } 959 960 /* 961 * nfs remove directory call 962 */ 963 nfs_rmdir(ndp) 964 register struct nameidata *ndp; 965 { 966 register u_long *p; 967 register caddr_t cp; 968 register long t1, t2; 969 caddr_t bpos, dpos; 970 u_long xid; 971 int error = 0; 972 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 973 974 if (ndp->ni_dvp == ndp->ni_vp) { 975 vrele(ndp->ni_dvp); 976 nfs_nput(ndp->ni_dvp); 977 return (EINVAL); 978 } 979 nfsstats.rpccnt[NFSPROC_RMDIR]++; 980 nfsm_reqhead(nfs_procids[NFSPROC_RMDIR], ndp->ni_cred, 981 NFSX_FH+NFSX_UNSIGNED+nfsm_rndup(ndp->ni_dent.d_namlen)); 982 nfsm_fhtom(ndp->ni_dvp); 983 nfsm_strtom(ndp->ni_dent.d_name, ndp->ni_dent.d_namlen, NFS_MAXNAMLEN); 984 nfsm_request(ndp->ni_dvp); 985 nfsm_reqdone; 986 cache_purge(ndp->ni_dvp); 987 cache_purge(ndp->ni_vp); 988 nfs_nput(ndp->ni_vp); 989 nfs_nput(ndp->ni_dvp); 990 return (error); 991 } 992 993 /* 994 * nfs readdir call 995 * Although cookie is defined as opaque, I translate it to/from net byte 996 * order so that it looks more sensible. This appears consistent with the 997 * Ultrix implementation of NFS. 998 */ 999 nfs_readdir(vp, uiop, cred) 1000 register struct vnode *vp; 1001 struct uio *uiop; 1002 struct ucred *cred; 1003 { 1004 register long len; 1005 register struct direct *dp; 1006 register u_long *p; 1007 register caddr_t cp; 1008 register long t1; 1009 caddr_t bpos, dpos, cp2; 1010 u_long xid; 1011 int error = 0; 1012 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1013 struct mbuf *md2; 1014 caddr_t dpos2; 1015 int siz; 1016 int more_dirs; 1017 off_t off, savoff; 1018 struct direct *savdp; 1019 1020 nfsstats.rpccnt[NFSPROC_READDIR]++; 1021 nfsm_reqhead(nfs_procids[NFSPROC_READDIR], cred, xid); 1022 nfsm_fhtom(vp); 1023 nfsm_build(p, u_long *, 2*NFSX_UNSIGNED); 1024 *p++ = txdr_unsigned(uiop->uio_offset); 1025 *p = txdr_unsigned(uiop->uio_resid); 1026 nfsm_request(vp); 1027 siz = 0; 1028 nfsm_disect(p, u_long *, NFSX_UNSIGNED); 1029 more_dirs = fxdr_unsigned(int, *p); 1030 1031 /* Save the position so that we can do nfsm_mtouio() later */ 1032 dpos2 = dpos; 1033 md2 = md; 1034 1035 /* loop thru the dir entries, doctoring them to 4bsd form */ 1036 savoff = off = 0; 1037 savdp = dp = NULL; 1038 while (more_dirs && siz < uiop->uio_resid) { 1039 savoff = off; /* Hold onto offset and dp */ 1040 savdp = dp; 1041 nfsm_disecton(p, u_long *, 2*NFSX_UNSIGNED); 1042 dp = (struct direct *)p; 1043 dp->d_ino = fxdr_unsigned(u_long, *p++); 1044 len = fxdr_unsigned(int, *p); 1045 if (len <= 0 || len > NFS_MAXNAMLEN) { 1046 error = EBADRPC; 1047 m_freem(mrep); 1048 goto nfsmout; 1049 } 1050 dp->d_namlen = (u_short)len; 1051 len = nfsm_rndup(len); 1052 nfsm_adv(len); 1053 nfsm_disecton(p, u_long *, 2*NFSX_UNSIGNED); 1054 off = fxdr_unsigned(off_t, *p); 1055 *p++ = 0; /* Ensures null termination of name */ 1056 more_dirs = fxdr_unsigned(int, *p); 1057 dp->d_reclen = len+4*NFSX_UNSIGNED; 1058 siz += dp->d_reclen; 1059 } 1060 /* 1061 * If at end of rpc data, get the eof boolean 1062 */ 1063 if (!more_dirs) 1064 nfsm_disecton(p, u_long *, NFSX_UNSIGNED); 1065 /* 1066 * If there is too much to fit in the data buffer, use savoff and 1067 * savdp to trim off the last record. 1068 * --> we are not at eof 1069 */ 1070 if (siz > uiop->uio_resid) { 1071 off = savoff; 1072 siz -= dp->d_reclen; 1073 dp = savdp; 1074 } 1075 if (siz > 0) { 1076 md = md2; 1077 dpos = dpos2; 1078 nfsm_mtouio(uiop, siz); 1079 uiop->uio_offset = off; 1080 } 1081 nfsm_reqdone; 1082 return (error); 1083 } 1084 1085 /* 1086 * nfs statfs call 1087 * (Actually a vfsop, not a vnode op) 1088 */ 1089 nfs_statfs(mp, sbp) 1090 struct mount *mp; 1091 register struct statfs *sbp; 1092 { 1093 register struct vnode *vp; 1094 register struct nfsv2_statfs *sfp; 1095 register caddr_t cp; 1096 register long t1; 1097 caddr_t bpos, dpos, cp2; 1098 u_long xid; 1099 int error = 0; 1100 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1101 struct nfsmount *nmp; 1102 struct ucred *cred; 1103 struct nfsnode *np; 1104 1105 nmp = vfs_to_nfs(mp); 1106 if (error = nfs_nget(mp, &nmp->nm_fh, &np)) 1107 return (error); 1108 vp = NFSTOV(np); 1109 nfsstats.rpccnt[NFSPROC_STATFS]++; 1110 cred = crget(); 1111 cred->cr_ngroups = 1; 1112 nfsm_reqhead(nfs_procids[NFSPROC_STATFS], cred, NFSX_FH); 1113 nfsm_fhtom(vp); 1114 nfsm_request(vp); 1115 nfsm_disect(sfp, struct nfsv2_statfs *, NFSX_STATFS); 1116 sbp->f_type = MOUNT_NFS; 1117 sbp->f_flags = nmp->nm_flag; 1118 sbp->f_bsize = fxdr_unsigned(long, sfp->sf_tsize); 1119 sbp->f_fsize = fxdr_unsigned(long, sfp->sf_bsize); 1120 sbp->f_blocks = fxdr_unsigned(long, sfp->sf_blocks); 1121 sbp->f_bfree = fxdr_unsigned(long, sfp->sf_bfree); 1122 sbp->f_bavail = fxdr_unsigned(long, sfp->sf_bavail); 1123 sbp->f_files = 0; 1124 sbp->f_ffree = 0; 1125 sbp->f_fsid.val[0] = mp->m_fsid.val[0]; 1126 sbp->f_fsid.val[1] = mp->m_fsid.val[1]; 1127 bcopy(nmp->nm_path, sbp->f_mntonname, MNAMELEN); 1128 bcopy(nmp->nm_host, sbp->f_mntfromname, MNAMELEN); 1129 nfsm_reqdone; 1130 nfs_nput(vp); 1131 crfree(cred); 1132 return (error); 1133 } 1134 1135 static char hextoasc[] = "0123456789abcdef"; 1136 1137 /* 1138 * Silly rename. To make the NFS filesystem that is stateless look a little 1139 * more like the "ufs" a remove of an active vnode is translated to a rename 1140 * to a funny looking filename that is removed by nfs_inactive on the 1141 * nfsnode. There is the potential for another process on a different client 1142 * to create the same funny name between the nfs_lookitup() fails and the 1143 * nfs_rename() completes, but... 1144 */ 1145 nfs_sillyrename(ndp, flag) 1146 register struct nameidata *ndp; 1147 int flag; 1148 { 1149 register struct nfsnode *np; 1150 register struct sillyrename *sp; 1151 register struct nameidata *tndp; 1152 int error; 1153 short pid; 1154 1155 np = VTONFS(ndp->ni_dvp); 1156 cache_purge(ndp->ni_dvp); 1157 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename), 1158 M_TEMP, M_WAITOK); 1159 sp->s_flag = flag; 1160 bcopy((caddr_t)&np->n_fh, (caddr_t)&sp->s_fh, NFSX_FH); 1161 np = VTONFS(ndp->ni_vp); 1162 tndp = &sp->s_namei; 1163 tndp->ni_cred = crdup(ndp->ni_cred); 1164 1165 /* Fudge together a funny name */ 1166 pid = u.u_procp->p_pid; 1167 bcopy(".nfsAxxxx4.4", tndp->ni_dent.d_name, 13); 1168 tndp->ni_dent.d_namlen = 12; 1169 tndp->ni_dent.d_name[8] = hextoasc[pid & 0xf]; 1170 tndp->ni_dent.d_name[7] = hextoasc[(pid >> 4) & 0xf]; 1171 tndp->ni_dent.d_name[6] = hextoasc[(pid >> 8) & 0xf]; 1172 tndp->ni_dent.d_name[5] = hextoasc[(pid >> 12) & 0xf]; 1173 1174 /* Try lookitups until we get one that isn't there */ 1175 while (nfs_lookitup(ndp->ni_dvp, tndp, (nfsv2fh_t *)0) == 0) { 1176 tndp->ni_dent.d_name[4]++; 1177 if (tndp->ni_dent.d_name[4] > 'z') { 1178 error = EINVAL; 1179 goto bad; 1180 } 1181 } 1182 if (error = nfs_renameit(ndp, tndp)) 1183 goto bad; 1184 nfs_lookitup(ndp->ni_dvp, tndp, &np->n_fh); 1185 np->n_sillyrename = sp; 1186 return (0); 1187 bad: 1188 crfree(tndp->ni_cred); 1189 free((caddr_t)sp, M_TEMP); 1190 return (error); 1191 } 1192 1193 /* 1194 * Look up a file name for silly rename stuff. 1195 * Just like nfs_lookup() except that it doesn't load returned values 1196 * into the nfsnode table. 1197 * If fhp != NULL it copies the returned file handle out 1198 */ 1199 nfs_lookitup(vp, ndp, fhp) 1200 register struct vnode *vp; 1201 register struct nameidata *ndp; 1202 nfsv2fh_t *fhp; 1203 { 1204 register u_long *p; 1205 register caddr_t cp; 1206 register long t1, t2; 1207 caddr_t bpos, dpos, cp2; 1208 u_long xid; 1209 int error = 0; 1210 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1211 long len; 1212 1213 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 1214 ndp->ni_dvp = vp; 1215 ndp->ni_vp = NULL; 1216 len = ndp->ni_dent.d_namlen; 1217 nfsm_reqhead(nfs_procids[NFSPROC_LOOKUP], ndp->ni_cred, NFSX_FH+NFSX_UNSIGNED+nfsm_rndup(len)); 1218 nfsm_fhtom(vp); 1219 nfsm_strtom(ndp->ni_dent.d_name, len, NFS_MAXNAMLEN); 1220 nfsm_request(vp); 1221 if (fhp != NULL) { 1222 nfsm_disect(cp, caddr_t, NFSX_FH); 1223 bcopy(cp, (caddr_t)fhp, NFSX_FH); 1224 } 1225 nfsm_reqdone; 1226 return (error); 1227 } 1228 1229 /* 1230 * Kludge City.. 1231 * - make nfs_bmap() essentially a no-op that does no translation 1232 * - do nfs_strategy() by faking physical I/O with nfs_readit/nfs_writeit 1233 * after mapping the physical addresses into Kernel Virtual space in the 1234 * nfsiobuf area. 1235 * (Maybe I could use the process's page mapping, but I was concerned that 1236 * Kernel Write might not be enabled and also figured copyout() would do 1237 * a lot more work than bcopy() and also it currently happens in the 1238 * context of the swapper process (2). 1239 */ 1240 nfs_bmap(vp, bn, vpp, bnp) 1241 struct vnode *vp; 1242 daddr_t bn; 1243 struct vnode **vpp; 1244 daddr_t *bnp; 1245 { 1246 if (vpp != NULL) 1247 *vpp = vp; 1248 if (bnp != NULL) 1249 *bnp = bn * btodb(vp->v_mount->m_bsize); 1250 return (0); 1251 } 1252 1253 /* 1254 * Strategy routine for phys. i/o 1255 * If the biod's are running, queue a request 1256 * otherwise just call nfs_doio() to get it done 1257 */ 1258 nfs_strategy(bp) 1259 register struct buf *bp; 1260 { 1261 register struct buf *dp; 1262 register int i; 1263 struct proc *rp; 1264 int error = 0; 1265 int fnd = 0; 1266 1267 /* 1268 * If an i/o daemon is waiting 1269 * queue the request, wake it up and wait for completion 1270 * otherwise just do it ourselves 1271 */ 1272 for (i = 0; i < nfs_asyncdaemons; i++) { 1273 if (rp = nfs_iodwant[i]) { 1274 /* 1275 * Ensure that the async_daemon is still waiting here 1276 */ 1277 if (rp->p_stat != SSLEEP || 1278 rp->p_wchan != ((caddr_t)&nfs_iodwant[i])) { 1279 nfs_iodwant[i] = (struct proc *)0; 1280 continue; 1281 } 1282 dp = &nfs_bqueue; 1283 if (dp->b_actf == NULL) { 1284 dp->b_actl = bp; 1285 bp->b_actf = dp; 1286 } else { 1287 dp->b_actf->b_actl = bp; 1288 bp->b_actf = dp->b_actf; 1289 } 1290 dp->b_actf = bp; 1291 bp->b_actl = dp; 1292 fnd++; 1293 nfs_iodwant[i] = (struct proc *)0; 1294 wakeup((caddr_t)&nfs_iodwant[i]); 1295 break; 1296 } 1297 } 1298 if (!fnd) 1299 error = nfs_doio(bp); 1300 return (error); 1301 } 1302 1303 /* 1304 * Fun and games with i/o 1305 * Essentially play ubasetup() and disk interrupt service routine by 1306 * mapping the data buffer into kernel virtual space and doing the 1307 * nfs read or write rpc's from it. 1308 * If the biod's are not running, this is just called from nfs_strategy(), 1309 * otherwise it is called by the biod's to do what would normally be 1310 * partially disk interrupt driven. 1311 */ 1312 nfs_doio(bp) 1313 register struct buf *bp; 1314 { 1315 register struct pte *pte, *ppte; 1316 register caddr_t vaddr; 1317 register struct uio *uiop; 1318 register struct vnode *vp; 1319 struct nfsnode *np; 1320 struct ucred *cr; 1321 int npf, npf2; 1322 int reg; 1323 caddr_t vbase; 1324 unsigned v; 1325 struct proc *rp; 1326 int o, error; 1327 struct uio uio; 1328 struct iovec io; 1329 1330 vp = bp->b_vp; 1331 uiop = &uio; 1332 uiop->uio_iov = &io; 1333 uiop->uio_iovcnt = 1; 1334 uiop->uio_segflg = UIO_SYSSPACE; 1335 1336 /* 1337 * For phys i/o, map the b_addr into kernel virtual space using 1338 * the Nfsiomap pte's 1339 * Also, add a temporary b_rcred for reading using the process's uid 1340 * and a guess at a group 1341 */ 1342 if (bp->b_flags & B_PHYS) { 1343 VTONFS(vp)->n_flag |= NPAGEDON; 1344 bp->b_rcred = cr = crget(); 1345 rp = (bp->b_flags & B_DIRTY) ? &proc[2] : bp->b_proc; 1346 cr->cr_uid = rp->p_uid; 1347 cr->cr_gid = 0; /* Anything ?? */ 1348 cr->cr_ngroups = 1; 1349 o = (int)bp->b_un.b_addr & PGOFSET; 1350 npf2 = npf = btoc(bp->b_bcount + o); 1351 1352 /* 1353 * Get some mapping page table entries 1354 */ 1355 while ((reg = rmalloc(nfsmap, (long)npf)) == 0) { 1356 nfsmap_want++; 1357 sleep((caddr_t)&nfsmap_want, PZERO-1); 1358 } 1359 reg--; 1360 if (bp->b_flags & B_PAGET) 1361 pte = &Usrptmap[btokmx((struct pte *)bp->b_un.b_addr)]; 1362 else { 1363 v = btop(bp->b_un.b_addr); 1364 if (bp->b_flags & B_UAREA) 1365 pte = &rp->p_addr[v]; 1366 else 1367 pte = vtopte(rp, v); 1368 } 1369 1370 /* 1371 * Play vmaccess() but with the Nfsiomap page table 1372 */ 1373 ppte = &Nfsiomap[reg]; 1374 vbase = vaddr = &nfsiobuf[reg*NBPG]; 1375 while (npf != 0) { 1376 mapin(ppte, (u_int)vaddr, pte->pg_pfnum, (int)(PG_V|PG_KW)); 1377 #if defined(tahoe) 1378 mtpr(P1DC, vaddr); 1379 #endif 1380 ppte++; 1381 pte++; 1382 vaddr += NBPG; 1383 --npf; 1384 } 1385 1386 /* 1387 * And do the i/o rpc 1388 */ 1389 io.iov_base = vbase+o; 1390 io.iov_len = uiop->uio_resid = bp->b_bcount; 1391 uiop->uio_offset = bp->b_blkno * DEV_BSIZE; 1392 if (bp->b_flags & B_READ) { 1393 uiop->uio_rw = UIO_READ; 1394 nfsstats.read_physios++; 1395 bp->b_error = error = nfs_readrpc(vp, uiop, bp->b_rcred); 1396 } else { 1397 uiop->uio_rw = UIO_WRITE; 1398 nfsstats.write_physios++; 1399 bp->b_error = error = nfs_writerpc(vp, uiop, bp->b_wcred); 1400 } 1401 1402 /* 1403 * Finally, release pte's used by physical i/o 1404 */ 1405 crfree(cr); 1406 rmfree(nfsmap, (long)npf2, (long)++reg); 1407 if (nfsmap_want) { 1408 nfsmap_want = 0; 1409 wakeup((caddr_t)&nfsmap_want); 1410 } 1411 } else { 1412 if (bp->b_flags & B_READ) { 1413 io.iov_len = uiop->uio_resid = bp->b_bcount; 1414 uiop->uio_offset = bp->b_blkno * DEV_BSIZE; 1415 io.iov_base = bp->b_un.b_addr; 1416 uiop->uio_rw = UIO_READ; 1417 nfsstats.read_bios++; 1418 bp->b_error = error = nfs_readrpc(vp, uiop, bp->b_rcred); 1419 } else { 1420 io.iov_len = uiop->uio_resid = bp->b_dirtyend 1421 - bp->b_dirtyoff; 1422 uiop->uio_offset = (bp->b_blkno * DEV_BSIZE) 1423 + bp->b_dirtyoff; 1424 io.iov_base = bp->b_un.b_addr + bp->b_dirtyoff; 1425 uiop->uio_rw = UIO_WRITE; 1426 nfsstats.write_bios++; 1427 bp->b_error = error = nfs_writerpc(vp, uiop, bp->b_wcred); 1428 if (error) { 1429 np = VTONFS(vp); 1430 np->n_error = error; 1431 np->n_flag |= NWRITEERR; 1432 } 1433 bp->b_dirtyoff = bp->b_dirtyend = 0; 1434 } 1435 } 1436 if (error) 1437 bp->b_flags |= B_ERROR; 1438 bp->b_resid = uiop->uio_resid; 1439 biodone(bp); 1440 return (error); 1441 } 1442 1443 /* 1444 * Flush all the blocks associated with a vnode. 1445 * Walk through the buffer pool and push any dirty pages 1446 * associated with the vnode. 1447 */ 1448 /* ARGSUSED */ 1449 nfs_fsync(vp, fflags, cred, waitfor) 1450 register struct vnode *vp; 1451 int fflags; 1452 struct ucred *cred; 1453 int waitfor; 1454 { 1455 register struct nfsnode *np = VTONFS(vp); 1456 int error = 0; 1457 1458 if (np->n_flag & NMODIFIED) { 1459 np->n_flag &= ~NMODIFIED; 1460 vflushbuf(vp, waitfor == MNT_WAIT ? B_SYNC : 0); 1461 } 1462 if (!error && (np->n_flag & NWRITEERR)) 1463 error = np->n_error; 1464 return (error); 1465 } 1466 1467 /* 1468 * Print out the contents of an nfsnode. 1469 */ 1470 nfs_print(vp) 1471 struct vnode *vp; 1472 { 1473 register struct nfsnode *np = VTONFS(vp); 1474 1475 printf("tag VT_NFS, fileid %d fsid 0x%x%s\n", 1476 np->n_vattr.va_fileid, np->n_vattr.va_fsid, 1477 (np->n_flag & NLOCKED) ? " (LOCKED)" : ""); 1478 } 1479