bsd/miscfs/fdesc/fdesc_vnops.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
  23 /*
  24  * Copyright (c) 1992, 1993
  25  *      The Regents of the University of California.  All rights reserved.
  26  *
  27  * This code is derived from software donated to Berkeley by
  28  * Jan-Simon Pendry.
  29  *
  30  * Redistribution and use in source and binary forms, with or without
  31  * modification, are permitted provided that the following conditions
  32  * are met:
  33  * 1. Redistributions of source code must retain the above copyright
  34  *    notice, this list of conditions and the following disclaimer.
  35  * 2. Redistributions in binary form must reproduce the above copyright
  36  *    notice, this list of conditions and the following disclaimer in the
  37  *    documentation and/or other materials provided with the distribution.
  38  * 3. All advertising materials mentioning features or use of this software
  39  *    must display the following acknowledgement:
  40  *      This product includes software developed by the University of
  41  *      California, Berkeley and its contributors.
  42  * 4. Neither the name of the University nor the names of its contributors
  43  *    may be used to endorse or promote products derived from this software
  44  *    without specific prior written permission.
  45  *
  46  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  47  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  48  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  49  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  50  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  51  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  52  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  53  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  54  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  55  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  56  * SUCH DAMAGE.
  57  *
  58  *      @(#)fdesc_vnops.c       8.17 (Berkeley) 5/22/95
  59  *
  60  */
  61
  62 /*
  63  * /dev/fd Filesystem
  64  */
  65
  66 #include <sys/param.h>
  67 #include <sys/systm.h>
  68 #include <sys/types.h>
  69 #include <sys/time.h>
  70 #include <sys/proc.h>
  71 #include <sys/kernel.h> /* boottime */
  72 #include <sys/resourcevar.h>
  73 #include <sys/filedesc.h>
  74 #include <sys/vnode.h>
  75 #include <sys/malloc.h>
  76 #include <sys/file.h>
  77 #include <sys/stat.h>
  78 #include <sys/mount.h>
  79 #include <sys/namei.h>
  80 #include <sys/buf.h>
  81 #include <sys/dirent.h>
  82 #include <sys/ubc.h>
  83 #include <miscfs/fdesc/fdesc.h>
  84 #include <vfs/vfs_support.h>
  85
  86 #define FDL_WANT        0x01
  87 #define FDL_LOCKED      0x02
  88 static int fdcache_lock;
  89
  90
  91 #if (FD_STDIN != FD_STDOUT-1) || (FD_STDOUT != FD_STDERR-1)
  92 FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n+1, n+2
  93 #endif
  94
  95 #define NFDCACHE 3
  96
  97 #define FD_NHASH(ix) \
  98         (&fdhashtbl[(ix) & fdhash])
  99 LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl;
 100 u_long fdhash;
 101
 102 /*
 103  * Initialise cache headers
 104  */
 105 fdesc_init(vfsp)
 106         struct vfsconf *vfsp;
 107 {
 108
 109         fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash);
 110 }
 111
 112 int
 113 fdesc_allocvp(ftype, ix, mp, vpp)
 114         fdntype ftype;
 115         int ix;
 116         struct mount *mp;
 117         struct vnode **vpp;
 118 {
 119         struct proc *p = current_proc();        /* XXX */
 120         struct fdhashhead *fc;
 121         struct fdescnode *fd;
 122         int error = 0;
 123
 124         fc = FD_NHASH(ix);
 125 loop:
 126         for (fd = fc->lh_first; fd != 0; fd = fd->fd_hash.le_next) {
 127                 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) {
 128                         if (vget(fd->fd_vnode, 0, p))
 129                                 goto loop;
 130                         *vpp = fd->fd_vnode;
 131                         return (error);
 132                 }
 133         }
 134
 135         /*
 136          * otherwise lock the array while we call getnewvnode
 137          * since that can block.
 138          */
 139         if (fdcache_lock & FDL_LOCKED) {
 140                 fdcache_lock |= FDL_WANT;
 141                 sleep((caddr_t) &fdcache_lock, PINOD);
 142                 goto loop;
 143         }
 144         fdcache_lock |= FDL_LOCKED;
 145
 146         MALLOC(fd, void *, sizeof(struct fdescnode), M_TEMP, M_WAITOK);
 147         error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp);
 148         if (error) {
 149                 FREE(fd, M_TEMP);
 150                 goto out;
 151         }
 152         (*vpp)->v_data = fd;
 153         fd->fd_vnode = *vpp;
 154         fd->fd_type = ftype;
 155         fd->fd_fd = -1;
 156         fd->fd_link = 0;
 157         fd->fd_ix = ix;
 158         LIST_INSERT_HEAD(fc, fd, fd_hash);
 159
 160 out:
 161         fdcache_lock &= ~FDL_LOCKED;
 162
 163         if (fdcache_lock & FDL_WANT) {
 164                 fdcache_lock &= ~FDL_WANT;
 165                 wakeup((caddr_t) &fdcache_lock);
 166         }
 167
 168         return (error);
 169 }
 170
 171 /*
 172  * vp is the current namei directory
 173  * ndp is the name to locate in that directory...
 174  */
 175 int
 176 fdesc_lookup(ap)
 177         struct vop_lookup_args /* {
 178                 struct vnode * a_dvp;
 179                 struct vnode ** a_vpp;
 180                 struct componentname * a_cnp;
 181         } */ *ap;
 182 {
 183         struct vnode **vpp = ap->a_vpp;
 184         struct vnode *dvp = ap->a_dvp;
 185         struct componentname *cnp = ap->a_cnp;
 186         char *pname = cnp->cn_nameptr;
 187         struct proc *p = cnp->cn_proc;
 188         int nfiles = p->p_fd->fd_nfiles;
 189         unsigned fd;
 190         int error;
 191         struct vnode *fvp;
 192         char *ln;
 193
 194         VOP_UNLOCK(dvp, 0, p);
 195         if (cnp->cn_namelen == 1 && *pname == '.') {
 196                 *vpp = dvp;
 197                 VREF(dvp);
 198                 vn_lock(dvp, LK_SHARED | LK_RETRY, p);
 199                 return (0);
 200         }
 201
 202         switch (VTOFDESC(dvp)->fd_type) {
 203         default:
 204         case Flink:
 205         case Fdesc:
 206                 error = ENOTDIR;
 207                 goto bad;
 208
 209         case Froot:
 210                 if (cnp->cn_namelen == 2 && bcmp(pname, "fd", 2) == 0) {
 211                         error = fdesc_allocvp(Fdevfd, FD_DEVFD, dvp->v_mount, &fvp);
 212                         if (error)
 213                                 goto bad;
 214                         *vpp = fvp;
 215                         fvp->v_type = VDIR;
 216                         vn_lock(fvp, LK_SHARED | LK_RETRY, p);
 217                         return (0);
 218                 }
 219
 220                 ln = 0;
 221                 switch (cnp->cn_namelen) {
 222                 case 5:
 223                         if (bcmp(pname, "stdin", 5) == 0) {
 224                                 ln = "fd/0";
 225                                 fd = FD_STDIN;
 226                         }
 227                         break;
 228                 case 6:
 229                         if (bcmp(pname, "stdout", 6) == 0) {
 230                                 ln = "fd/1";
 231                                 fd = FD_STDOUT;
 232                         } else
 233                         if (bcmp(pname, "stderr", 6) == 0) {
 234                                 ln = "fd/2";
 235                                 fd = FD_STDERR;
 236                         }
 237                         break;
 238                 }
 239
 240                 if (ln) {
 241                         error = fdesc_allocvp(Flink, fd, dvp->v_mount, &fvp);
 242                         if (error)
 243                                 goto bad;
 244                         VTOFDESC(fvp)->fd_link = ln;
 245                         *vpp = fvp;
 246                         fvp->v_type = VLNK;
 247                         vn_lock(fvp, LK_SHARED | LK_RETRY, p);
 248                         return (0);
 249                 } else {
 250                         error = ENOENT;
 251                         goto bad;
 252                 }
 253
 254                 /* FALL THROUGH */
 255
 256         case Fdevfd:
 257                 if (cnp->cn_namelen == 2 && bcmp(pname, "..", 2) == 0) {
 258                         if (error = fdesc_root(dvp->v_mount, vpp))
 259                                 goto bad;
 260                         return (0);
 261                 }
 262
 263                 fd = 0;
 264                 while (*pname >= '0' && *pname <= '9') {
 265                         fd = 10 * fd + *pname++ - '0';
 266                         if (fd >= nfiles)
 267                                 break;
 268                 }
 269
 270                 if (*pname != '\0') {
 271                         error = ENOENT;
 272                         goto bad;
 273                 }
 274
 275                 if (fd >= nfiles ||
 276                                 *fdfile(p, fd) == NULL ||
 277                                 (*fdflags(p, fd) & UF_RESERVED)) {
 278                         error = EBADF;
 279                         goto bad;
 280                 }
 281
 282                 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp);
 283                 if (error)
 284                         goto bad;
 285                 VTOFDESC(fvp)->fd_fd = fd;
 286                 vn_lock(fvp, LK_SHARED | LK_RETRY, p);
 287                 *vpp = fvp;
 288                 return (0);
 289         }
 290
 291 bad:;
 292         vn_lock(dvp, LK_SHARED | LK_RETRY, p);
 293         *vpp = NULL;
 294         return (error);
 295 }
 296
 297 int
 298 fdesc_open(ap)
 299         struct vop_open_args /* {
 300                 struct vnode *a_vp;
 301                 int  a_mode;
 302                 struct ucred *a_cred;
 303                 struct proc *a_p;
 304         } */ *ap;
 305 {
 306         struct vnode *vp = ap->a_vp;
 307         int error = 0;
 308
 309         switch (VTOFDESC(vp)->fd_type) {
 310         case Fdesc:
 311                 /*
 312                  * XXX Kludge: set p->p_dupfd to contain the value of the
 313                  * the file descriptor being sought for duplication. The error
 314                  * return ensures that the vnode for this device will be
 315                  * released by vn_open. Open will detect this special error and
 316                  * take the actions in dupfdopen.  Other callers of vn_open or
 317                  * VOP_OPEN will simply report the error.
 318                  */
 319                 ap->a_p->p_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
 320                 error = ENODEV;
 321                 break;
 322
 323         }
 324
 325         return (error);
 326 }
 327
 328 static int
 329 fdesc_attr(fd, vap, cred, p)
 330         int fd;
 331         struct vattr *vap;
 332         struct ucred *cred;
 333         struct proc *p;
 334 {
 335         struct file *fp;
 336         struct stat stb;
 337         int error;
 338
 339         if (error = fdgetf(p, fd, &fp))
 340                 return (error);
 341         switch (fp->f_type) {
 342         case DTYPE_VNODE:
 343                 error = VOP_GETATTR((struct vnode *) fp->f_data, vap, cred, p);
 344                 if (error == 0 && vap->va_type == VDIR) {
 345                         /*
 346                          * directories can cause loops in the namespace,
 347                          * so turn off the 'x' bits to avoid trouble.
 348                          */
 349                         vap->va_mode &= ~((VEXEC)|(VEXEC>>3)|(VEXEC>>6));
 350                 }
 351                 break;
 352
 353         case DTYPE_SOCKET:
 354                 error = soo_stat((struct socket *)fp->f_data, &stb);
 355                 if (error == 0) {
 356                         vattr_null(vap);
 357                         vap->va_type = VSOCK;
 358                         vap->va_mode = stb.st_mode;
 359                         vap->va_nlink = stb.st_nlink;
 360                         vap->va_uid = stb.st_uid;
 361                         vap->va_gid = stb.st_gid;
 362                         vap->va_fsid = stb.st_dev;
 363                         vap->va_fileid = stb.st_ino;
 364                         vap->va_size = stb.st_size;
 365                         vap->va_blocksize = stb.st_blksize;
 366                         vap->va_atime = stb.st_atimespec;
 367                         vap->va_mtime = stb.st_mtimespec;
 368                         vap->va_ctime = stb.st_ctimespec;
 369                         vap->va_gen = stb.st_gen;
 370                         vap->va_flags = stb.st_flags;
 371                         vap->va_rdev = stb.st_rdev;
 372                         vap->va_bytes = stb.st_blocks * stb.st_blksize;
 373                 }
 374                 break;
 375
 376         default:
 377                 return (EBADF);
 378                 break;
 379         }
 380
 381         return (error);
 382 }
 383
 384 int
 385 fdesc_getattr(ap)
 386         struct vop_getattr_args /* {
 387                 struct vnode *a_vp;
 388                 struct vattr *a_vap;
 389                 struct ucred *a_cred;
 390                 struct proc *a_p;
 391         } */ *ap;
 392 {
 393         struct vnode *vp = ap->a_vp;
 394         struct vattr *vap = ap->a_vap;
 395         unsigned fd;
 396         int error = 0;
 397
 398         switch (VTOFDESC(vp)->fd_type) {
 399         case Froot:
 400         case Fdevfd:
 401         case Flink:
 402                 bzero((caddr_t) vap, sizeof(*vap));
 403                 vattr_null(vap);
 404                 vap->va_fileid = VTOFDESC(vp)->fd_ix;
 405
 406                 vap->va_uid = 0;
 407                 vap->va_gid = 0;
 408                 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
 409                 vap->va_blocksize = DEV_BSIZE;
 410                 vap->va_atime.tv_sec = boottime.tv_sec;
 411                 vap->va_atime.tv_nsec = 0;
 412                 vap->va_mtime = vap->va_atime;
 413                 vap->va_ctime = vap->va_mtime;
 414                 vap->va_gen = 0;
 415                 vap->va_flags = 0;
 416                 vap->va_rdev = 0;
 417                 vap->va_bytes = 0;
 418
 419                 switch (VTOFDESC(vp)->fd_type) {
 420                 case Flink:
 421                         vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
 422                         vap->va_type = VLNK;
 423                         vap->va_nlink = 1;
 424                         vap->va_size = strlen(VTOFDESC(vp)->fd_link);
 425                         break;
 426
 427                 default:
 428                         vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
 429                         vap->va_type = VDIR;
 430                         vap->va_nlink = 2;
 431                         vap->va_size = DEV_BSIZE;
 432                         break;
 433                 }
 434                 break;
 435
 436         case Fdesc:
 437                 fd = VTOFDESC(vp)->fd_fd;
 438                 error = fdesc_attr(fd, vap, ap->a_cred, ap->a_p);
 439                 break;
 440
 441         default:
 442                 return (EBADF);
 443                 break;
 444         }
 445
 446         if (error == 0) {
 447                 vp->v_type = vap->va_type;
 448         }
 449
 450         return (error);
 451 }
 452
 453 int
 454 fdesc_setattr(ap)
 455         struct vop_setattr_args /* {
 456                 struct vnode *a_vp;
 457                 struct vattr *a_vap;
 458                 struct ucred *a_cred;
 459                 struct proc *a_p;
 460         } */ *ap;
 461 {
 462         struct file *fp;
 463         unsigned fd;
 464         int error;
 465
 466         /*
 467          * Can't mess with the root vnode
 468          */
 469         switch (VTOFDESC(ap->a_vp)->fd_type) {
 470         case Fdesc:
 471                 break;
 472
 473         default:
 474                 return (EACCES);
 475         }
 476
 477         fd = VTOFDESC(ap->a_vp)->fd_fd;
 478         if (error = fdgetf(ap->a_p, fd, &fp))
 479                 return (error);
 480
 481         /*
 482          * Can setattr the underlying vnode, but not sockets!
 483          */
 484         switch (fp->f_type) {
 485         case DTYPE_VNODE:
 486                 error = VOP_SETATTR((struct vnode *) fp->f_data, ap->a_vap, ap->a_cred, ap->a_p);
 487                 break;
 488
 489         case DTYPE_SOCKET:
 490                 error = 0;
 491                 break;
 492
 493         default:
 494                 kprintf("fp->f_type = %d\n", fp->f_type);
 495         error = EBADF;
 496                 break;
 497         }
 498
 499         return (error);
 500 }
 501
 502 #define UIO_MX 16
 503
 504 static struct dirtmp {
 505         u_long d_fileno;
 506         u_short d_reclen;
 507         u_short d_namlen;
 508         char d_name[8];
 509 } rootent[] = {
 510         { FD_DEVFD, UIO_MX, 2, "fd" },
 511         { FD_STDIN, UIO_MX, 5, "stdin" },
 512         { FD_STDOUT, UIO_MX, 6, "stdout" },
 513         { FD_STDERR, UIO_MX, 6, "stderr" },
 514         { 0 }
 515 };
 516
 517 int
 518 fdesc_readdir(ap)
 519         struct vop_readdir_args /* {
 520                 struct vnode *a_vp;
 521                 struct uio *a_uio;
 522                 struct ucred *a_cred;
 523                 int *a_eofflag;
 524                 u_long *a_cookies;
 525                 int a_ncookies;
 526         } */ *ap;
 527 {
 528         struct uio *uio = ap->a_uio;
 529         struct proc *p = uio->uio_procp;
 530         int i, error;
 531
 532         /*
 533          * We don't allow exporting fdesc mounts, and currently local
 534          * requests do not need cookies.
 535          */
 536         if (ap->a_ncookies)
 537                 return (EINVAL);
 538
 539         switch (VTOFDESC(ap->a_vp)->fd_type) {
 540         case Fdesc:
 541                 return (ENOTDIR);
 542
 543         default:
 544                 break;
 545         }
 546
 547         if (VTOFDESC(ap->a_vp)->fd_type == Froot) {
 548                 struct dirent d;
 549                 struct dirent *dp = &d;
 550                 struct dirtmp *dt;
 551                 int fd;
 552
 553                 i = uio->uio_offset / UIO_MX;
 554                 error = 0;
 555
 556                 while (uio->uio_resid > 0) {
 557                         dt = &rootent[i];
 558                         if (dt->d_fileno == 0) {
 559                                 /**eofflagp = 1;*/
 560                                 break;
 561                         }
 562                         i++;
 563
 564                         switch (dt->d_fileno) {
 565                         case FD_STDIN:
 566                         case FD_STDOUT:
 567                         case FD_STDERR:
 568                                 fd = dt->d_fileno - FD_STDIN;
 569                                 if (fd >= p->p_fd->fd_nfiles)
 570                                         continue;
 571                                 if (*fdfile(p, fd) == NULL &&
 572                                                 !(*fdflags(p, fd) &
 573                                                         UF_RESERVED))
 574                                         continue;
 575                                 break;
 576                         }
 577                         bzero((caddr_t) dp, UIO_MX);
 578                         dp->d_fileno = dt->d_fileno;
 579                         dp->d_namlen = dt->d_namlen;
 580                         dp->d_type = DT_UNKNOWN;
 581                         dp->d_reclen = dt->d_reclen;
 582                         bcopy(dt->d_name, dp->d_name, dp->d_namlen+1);
 583                         error = uiomove((caddr_t) dp, UIO_MX, uio);
 584                         if (error)
 585                                 break;
 586                 }
 587                 uio->uio_offset = i * UIO_MX;
 588                 return (error);
 589         }
 590
 591         i = uio->uio_offset / UIO_MX;
 592         error = 0;
 593         while (uio->uio_resid > 0) {
 594                 if (i >= p->p_fd->fd_nfiles)
 595                         break;
 596
 597                 if (*fdfile(p, i) != NULL && !(*fdflags(p, i) & UF_RESERVED)) {
 598                         struct dirent d;
 599                         struct dirent *dp = &d;
 600
 601                         bzero((caddr_t) dp, UIO_MX);
 602
 603                         dp->d_namlen = sprintf(dp->d_name, "%d", i);
 604                         dp->d_reclen = UIO_MX;
 605                         dp->d_type = DT_UNKNOWN;
 606                         dp->d_fileno = i + FD_STDIN;
 607                         /*
 608                          * And ship to userland
 609                          */
 610                         error = uiomove((caddr_t) dp, UIO_MX, uio);
 611                         if (error)
 612                                 break;
 613                 }
 614                 i++;
 615         }
 616
 617         uio->uio_offset = i * UIO_MX;
 618         return (error);
 619 }
 620
 621 int
 622 fdesc_readlink(ap)
 623         struct vop_readlink_args /* {
 624                 struct vnode *a_vp;
 625                 struct uio *a_uio;
 626                 struct ucred *a_cred;
 627         } */ *ap;
 628 {
 629         struct vnode *vp = ap->a_vp;
 630         int error;
 631
 632         if (vp->v_type != VLNK)
 633                 return (EPERM);
 634
 635         if (VTOFDESC(vp)->fd_type == Flink) {
 636                 char *ln = VTOFDESC(vp)->fd_link;
 637                 error = uiomove(ln, strlen(ln), ap->a_uio);
 638         } else {
 639                 error = EOPNOTSUPP;
 640         }
 641
 642         return (error);
 643 }
 644
 645 int
 646 fdesc_read(ap)
 647         struct vop_read_args /* {
 648                 struct vnode *a_vp;
 649                 struct uio *a_uio;
 650                 int  a_ioflag;
 651                 struct ucred *a_cred;
 652         } */ *ap;
 653 {
 654
 655         return (EOPNOTSUPP);
 656 }
 657
 658 int
 659 fdesc_write(ap)
 660         struct vop_write_args /* {
 661                 struct vnode *a_vp;
 662                 struct uio *a_uio;
 663                 int  a_ioflag;
 664                 struct ucred *a_cred;
 665         } */ *ap;
 666 {
 667         return (EOPNOTSUPP);
 668 }
 669
 670 int
 671 fdesc_ioctl(ap)
 672         struct vop_ioctl_args /* {
 673                 struct vnode *a_vp;
 674                 int  a_command;
 675                 caddr_t  a_data;
 676                 int  a_fflag;
 677                 struct ucred *a_cred;
 678                 struct proc *a_p;
 679         } */ *ap;
 680 {
 681         return (EOPNOTSUPP);
 682 }
 683
 684 int
 685 fdesc_select(ap)
 686         struct vop_select_args /* {
 687                 struct vnode *a_vp;
 688                 int  a_which;
 689                 int  a_fflags;
 690                 struct ucred *a_cred;
 691                 void *a_wql;
 692                 struct proc *a_p;
 693         } */ *ap;
 694 {
 695         return (EOPNOTSUPP);
 696 }
 697
 698 int
 699 fdesc_inactive(ap)
 700         struct vop_inactive_args /* {
 701                 struct vnode *a_vp;
 702                 struct proc *a_p;
 703         } */ *ap;
 704 {
 705         struct vnode *vp = ap->a_vp;
 706
 707         /*
 708          * Clear out the v_type field to avoid
 709          * nasty things happening in vgone().
 710          */
 711         VOP_UNLOCK(vp, 0, ap->a_p);
 712         vp->v_type = VNON;
 713         return (0);
 714 }
 715
 716 int
 717 fdesc_reclaim(ap)
 718         struct vop_reclaim_args /* {
 719                 struct vnode *a_vp;
 720         } */ *ap;
 721 {
 722         struct vnode *vp = ap->a_vp;
 723         struct fdescnode *fd = VTOFDESC(vp);
 724
 725         LIST_REMOVE(fd, fd_hash);
 726         FREE(vp->v_data, M_TEMP);
 727         vp->v_data = 0;
 728
 729         return (0);
 730 }
 731
 732 /*
 733  * Return POSIX pathconf information applicable to special devices.
 734  */
 735 fdesc_pathconf(ap)
 736         struct vop_pathconf_args /* {
 737                 struct vnode *a_vp;
 738                 int a_name;
 739                 int *a_retval;
 740         } */ *ap;
 741 {
 742
 743         switch (ap->a_name) {
 744         case _PC_LINK_MAX:
 745                 *ap->a_retval = LINK_MAX;
 746                 return (0);
 747         case _PC_MAX_CANON:
 748                 *ap->a_retval = MAX_CANON;
 749                 return (0);
 750         case _PC_MAX_INPUT:
 751                 *ap->a_retval = MAX_INPUT;
 752                 return (0);
 753         case _PC_PIPE_BUF:
 754                 *ap->a_retval = PIPE_BUF;
 755                 return (0);
 756         case _PC_CHOWN_RESTRICTED:
 757                 *ap->a_retval = 1;
 758                 return (0);
 759         case _PC_VDISABLE:
 760                 *ap->a_retval = _POSIX_VDISABLE;
 761                 return (0);
 762         default:
 763                 return (EINVAL);
 764         }
 765         /* NOTREACHED */
 766 }
 767
 768 /*
 769  * Print out the contents of a /dev/fd vnode.
 770  */
 771 /* ARGSUSED */
 772 int
 773 fdesc_print(ap)
 774         struct vop_print_args /* {
 775                 struct vnode *a_vp;
 776         } */ *ap;
 777 {
 778
 779         printf("tag VT_NON, fdesc vnode\n");
 780         return (0);
 781 }
 782
 783 /*void*/
 784 int
 785 fdesc_vfree(ap)
 786         struct vop_vfree_args /* {
 787                 struct vnode *a_pvp;
 788                 ino_t a_ino;
 789                 int a_mode;
 790         } */ *ap;
 791 {
 792
 793         return (0);
 794 }
 795
 796 /*
 797  * /dev/fd "should never get here" operation
 798  */
 799 int
 800 fdesc_badop()
 801 {
 802
 803         return (ENOTSUP);
 804         /* NOTREACHED */
 805 }
 806
 807 #define VOPFUNC int (*)(void *)
 808
 809 #define fdesc_create ((int (*) __P((struct  vop_create_args *)))eopnotsupp)
 810 #define fdesc_mknod ((int (*) __P((struct  vop_mknod_args *)))eopnotsupp)
 811 #define fdesc_close ((int (*) __P((struct  vop_close_args *)))nullop)
 812 #define fdesc_access ((int (*) __P((struct  vop_access_args *)))nullop)
 813 #define fdesc_mmap ((int (*) __P((struct  vop_mmap_args *)))eopnotsupp)
 814 #define fdesc_revoke vop_revoke
 815 #define fdesc_fsync ((int (*) __P((struct  vop_fsync_args *)))nullop)
 816 #define fdesc_seek ((int (*) __P((struct  vop_seek_args *)))nullop)
 817 #define fdesc_remove ((int (*) __P((struct  vop_remove_args *)))eopnotsupp)
 818 #define fdesc_link ((int (*) __P((struct  vop_link_args *)))eopnotsupp)
 819 #define fdesc_rename ((int (*) __P((struct  vop_rename_args *)))eopnotsupp)
 820 #define fdesc_mkdir ((int (*) __P((struct  vop_mkdir_args *)))eopnotsupp)
 821 #define fdesc_rmdir ((int (*) __P((struct  vop_rmdir_args *)))eopnotsupp)
 822 #define fdesc_symlink ((int (*) __P((struct vop_symlink_args *)))eopnotsupp)
 823 #define fdesc_abortop ((int (*) __P((struct  vop_abortop_args *)))nullop)
 824 #define fdesc_lock ((int (*) __P((struct  vop_lock_args *)))vop_nolock)
 825 #define fdesc_unlock ((int (*) __P((struct  vop_unlock_args *)))vop_nounlock)
 826 #define fdesc_bmap ((int (*) __P((struct  vop_bmap_args *)))fdesc_badop)
 827 #define fdesc_strategy ((int (*) __P((struct  vop_strategy_args *)))fdesc_badop)
 828 #define fdesc_islocked \
 829         ((int (*) __P((struct vop_islocked_args *)))vop_noislocked)
 830 #define fdesc_advlock ((int (*) __P((struct vop_advlock_args *)))eopnotsupp)
 831 #define fdesc_blkatoff \
 832         ((int (*) __P((struct  vop_blkatoff_args *)))eopnotsupp)
 833 #define fdesc_valloc ((int(*) __P(( \
 834                 struct vnode *pvp, \
 835                 int mode, \
 836                 struct ucred *cred, \
 837                 struct vnode **vpp))) eopnotsupp)
 838 #define fdesc_truncate \
 839         ((int (*) __P((struct  vop_truncate_args *)))eopnotsupp)
 840 #define fdesc_update ((int (*) __P((struct  vop_update_args *)))eopnotsupp)
 841 #define fdesc_bwrite ((int (*) __P((struct  vop_bwrite_args *)))eopnotsupp)
 842 #define fdesc_blktooff ((int (*) __P((struct  vop_blktooff_args *)))eopnotsupp)
 843 #define fdesc_offtoblk ((int (*) __P((struct  vop_offtoblk_args *)))eopnotsupp)
 844 #define fdesc_cmap ((int (*) __P((struct  vop_cmap_args *)))eopnotsupp)
 845
 846 int (**fdesc_vnodeop_p)(void *);
 847 struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = {
 848         { &vop_default_desc, (VOPFUNC)vn_default_error },
 849         { &vop_lookup_desc, (VOPFUNC)fdesc_lookup },    /* lookup */
 850         { &vop_create_desc, (VOPFUNC)fdesc_create },    /* create */
 851         { &vop_mknod_desc, (VOPFUNC)fdesc_mknod },      /* mknod */
 852         { &vop_open_desc, (VOPFUNC)fdesc_open },        /* open */
 853         { &vop_close_desc, (VOPFUNC)fdesc_close },      /* close */
 854         { &vop_access_desc, (VOPFUNC)fdesc_access },    /* access */
 855         { &vop_getattr_desc, (VOPFUNC)fdesc_getattr },  /* getattr */
 856         { &vop_setattr_desc, (VOPFUNC)fdesc_setattr },  /* setattr */
 857         { &vop_read_desc, (VOPFUNC)fdesc_read },        /* read */
 858         { &vop_write_desc, (VOPFUNC)fdesc_write },      /* write */
 859         { &vop_ioctl_desc, (VOPFUNC)fdesc_ioctl },      /* ioctl */
 860         { &vop_select_desc, (VOPFUNC)fdesc_select },    /* select */
 861         { &vop_revoke_desc, (VOPFUNC)fdesc_revoke },    /* revoke */
 862         { &vop_mmap_desc, (VOPFUNC)fdesc_mmap },        /* mmap */
 863         { &vop_fsync_desc, (VOPFUNC)fdesc_fsync },      /* fsync */
 864         { &vop_seek_desc, (VOPFUNC)fdesc_seek },        /* seek */
 865         { &vop_remove_desc, (VOPFUNC)fdesc_remove },    /* remove */
 866         { &vop_link_desc, (VOPFUNC)fdesc_link },        /* link */
 867         { &vop_rename_desc, (VOPFUNC)fdesc_rename },    /* rename */
 868         { &vop_mkdir_desc, (VOPFUNC)fdesc_mkdir },      /* mkdir */
 869         { &vop_rmdir_desc, (VOPFUNC)fdesc_rmdir },      /* rmdir */
 870         { &vop_symlink_desc, (VOPFUNC)fdesc_symlink },  /* symlink */
 871         { &vop_readdir_desc, (VOPFUNC)fdesc_readdir },  /* readdir */
 872         { &vop_readlink_desc, (VOPFUNC)fdesc_readlink },/* readlink */
 873         { &vop_abortop_desc, (VOPFUNC)fdesc_abortop },  /* abortop */
 874         { &vop_inactive_desc, (VOPFUNC)fdesc_inactive },/* inactive */
 875         { &vop_reclaim_desc, (VOPFUNC)fdesc_reclaim },  /* reclaim */
 876         { &vop_lock_desc, (VOPFUNC)fdesc_lock },        /* lock */
 877         { &vop_unlock_desc, (VOPFUNC)fdesc_unlock },    /* unlock */
 878         { &vop_bmap_desc, (VOPFUNC)fdesc_bmap },        /* bmap */
 879         { &vop_strategy_desc, (VOPFUNC)fdesc_strategy },        /* strategy */
 880         { &vop_print_desc, (VOPFUNC)fdesc_print },      /* print */
 881         { &vop_islocked_desc, (VOPFUNC)fdesc_islocked },        /* islocked */
 882         { &vop_pathconf_desc, (VOPFUNC)fdesc_pathconf },        /* pathconf */
 883         { &vop_advlock_desc, (VOPFUNC)fdesc_advlock },  /* advlock */
 884         { &vop_blkatoff_desc, (VOPFUNC)fdesc_blkatoff },        /* blkatoff */
 885         { &vop_valloc_desc, (VOPFUNC)fdesc_valloc },    /* valloc */
 886         { &vop_vfree_desc, (VOPFUNC)fdesc_vfree },      /* vfree */
 887         { &vop_truncate_desc, (VOPFUNC)fdesc_truncate },        /* truncate */
 888         { &vop_update_desc, (VOPFUNC)fdesc_update },    /* update */
 889         { &vop_bwrite_desc, (VOPFUNC)fdesc_bwrite },    /* bwrite */
 890         { &vop_pagein_desc, (VOPFUNC)err_pagein },      /* pagein */
 891         { &vop_pageout_desc, (VOPFUNC)err_pageout },    /* pageout */
 892         { &vop_copyfile_desc, (VOPFUNC)err_copyfile },  /* Copyfile */
 893         { &vop_blktooff_desc, (VOPFUNC)fdesc_blktooff },        /* blktooff */
 894         { &vop_blktooff_desc, (VOPFUNC)fdesc_offtoblk },        /* offtoblk */
 895         { &vop_cmap_desc, (VOPFUNC)fdesc_cmap },        /* cmap */
 896         { (struct vnodeop_desc*)NULL, (VOPFUNC)NULL }
 897 };
 898 struct vnodeopv_desc fdesc_vnodeop_opv_desc =
 899         { &fdesc_vnodeop_p, fdesc_vnodeop_entries };