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 cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
  87
  88 #define FDL_WANT        0x01
  89 #define FDL_LOCKED      0x02
  90 static int fdcache_lock;
  91
  92 dev_t devctty;
  93
  94 #if (FD_STDIN != FD_STDOUT-1) || (FD_STDOUT != FD_STDERR-1)
  95 FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n+1, n+2
  96 #endif
  97
  98 #define NFDCACHE 4
  99
 100 #define FD_NHASH(ix) \
 101         (&fdhashtbl[(ix) & fdhash])
 102 LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl;
 103 u_long fdhash;
 104
 105 /*
 106  * Initialise cache headers
 107  */
 108 fdesc_init(vfsp)
 109         struct vfsconf *vfsp;
 110 {
 111
 112         devctty = makedev(nchrdev, 0);
 113         fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash);
 114 }
 115
 116 int
 117 fdesc_allocvp(ftype, ix, mp, vpp)
 118         fdntype ftype;
 119         int ix;
 120         struct mount *mp;
 121         struct vnode **vpp;
 122 {
 123         struct proc *p = current_proc();        /* XXX */
 124         struct fdhashhead *fc;
 125         struct fdescnode *fd;
 126         int error = 0;
 127
 128         fc = FD_NHASH(ix);
 129 loop:
 130         for (fd = fc->lh_first; fd != 0; fd = fd->fd_hash.le_next) {
 131                 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) {
 132                         if (vget(fd->fd_vnode, 0, p))
 133                                 goto loop;
 134                         *vpp = fd->fd_vnode;
 135                         return (error);
 136                 }
 137         }
 138
 139         /*
 140          * otherwise lock the array while we call getnewvnode
 141          * since that can block.
 142          */
 143         if (fdcache_lock & FDL_LOCKED) {
 144                 fdcache_lock |= FDL_WANT;
 145                 sleep((caddr_t) &fdcache_lock, PINOD);
 146                 goto loop;
 147         }
 148         fdcache_lock |= FDL_LOCKED;
 149
 150         MALLOC(fd, void *, sizeof(struct fdescnode), M_TEMP, M_WAITOK);
 151         error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp);
 152         if (error) {
 153                 FREE(fd, M_TEMP);
 154                 goto out;
 155         }
 156         (*vpp)->v_data = fd;
 157         fd->fd_vnode = *vpp;
 158         fd->fd_type = ftype;
 159         fd->fd_fd = -1;
 160         fd->fd_link = 0;
 161         fd->fd_ix = ix;
 162         LIST_INSERT_HEAD(fc, fd, fd_hash);
 163
 164 out:
 165         fdcache_lock &= ~FDL_LOCKED;
 166
 167         if (fdcache_lock & FDL_WANT) {
 168                 fdcache_lock &= ~FDL_WANT;
 169                 wakeup((caddr_t) &fdcache_lock);
 170         }
 171
 172         return (error);
 173 }
 174
 175 /*
 176  * vp is the current namei directory
 177  * ndp is the name to locate in that directory...
 178  */
 179 int
 180 fdesc_lookup(ap)
 181         struct vop_lookup_args /* {
 182                 struct vnode * a_dvp;
 183                 struct vnode ** a_vpp;
 184                 struct componentname * a_cnp;
 185         } */ *ap;
 186 {
 187         struct vnode **vpp = ap->a_vpp;
 188         struct vnode *dvp = ap->a_dvp;
 189         struct componentname *cnp = ap->a_cnp;
 190         char *pname = cnp->cn_nameptr;
 191         struct proc *p = cnp->cn_proc;
 192         int nfiles = p->p_fd->fd_nfiles;
 193         unsigned fd;
 194         int error;
 195         struct vnode *fvp;
 196         char *ln;
 197
 198         VOP_UNLOCK(dvp, 0, p);
 199         if (cnp->cn_namelen == 1 && *pname == '.') {
 200                 *vpp = dvp;
 201                 VREF(dvp);
 202                 vn_lock(dvp, LK_SHARED | LK_RETRY, p);
 203                 return (0);
 204         }
 205
 206         switch (VTOFDESC(dvp)->fd_type) {
 207         default:
 208         case Flink:
 209         case Fdesc:
 210         case Fctty:
 211                 error = ENOTDIR;
 212                 goto bad;
 213
 214         case Froot:
 215                 if (cnp->cn_namelen == 2 && bcmp(pname, "fd", 2) == 0) {
 216                         error = fdesc_allocvp(Fdevfd, FD_DEVFD, dvp->v_mount, &fvp);
 217                         if (error)
 218                                 goto bad;
 219                         *vpp = fvp;
 220                         fvp->v_type = VDIR;
 221                         vn_lock(fvp, LK_SHARED | LK_RETRY, p);
 222                         return (0);
 223                 }
 224
 225                 if (cnp->cn_namelen == 3 && bcmp(pname, "tty", 3) == 0) {
 226                         struct vnode *ttyvp = cttyvp(p);
 227                         if (ttyvp == NULL) {
 228                                 error = ENXIO;
 229                                 goto bad;
 230                         }
 231                         error = fdesc_allocvp(Fctty, FD_CTTY, dvp->v_mount, &fvp);
 232                         if (error)
 233                                 goto bad;
 234                         *vpp = fvp;
 235                         fvp->v_type = VCHR;
 236                         vn_lock(fvp, LK_SHARED | LK_RETRY, p);
 237                         return (0);
 238                 }
 239
 240                 ln = 0;
 241                 switch (cnp->cn_namelen) {
 242                 case 5:
 243                         if (bcmp(pname, "stdin", 5) == 0) {
 244                                 ln = "fd/0";
 245                                 fd = FD_STDIN;
 246                         }
 247                         break;
 248                 case 6:
 249                         if (bcmp(pname, "stdout", 6) == 0) {
 250                                 ln = "fd/1";
 251                                 fd = FD_STDOUT;
 252                         } else
 253                         if (bcmp(pname, "stderr", 6) == 0) {
 254                                 ln = "fd/2";
 255                                 fd = FD_STDERR;
 256                         }
 257                         break;
 258                 }
 259
 260                 if (ln) {
 261                         error = fdesc_allocvp(Flink, fd, dvp->v_mount, &fvp);
 262                         if (error)
 263                                 goto bad;
 264                         VTOFDESC(fvp)->fd_link = ln;
 265                         *vpp = fvp;
 266                         fvp->v_type = VLNK;
 267                         vn_lock(fvp, LK_SHARED | LK_RETRY, p);
 268                         return (0);
 269                 } else {
 270                         error = ENOENT;
 271                         goto bad;
 272                 }
 273
 274                 /* FALL THROUGH */
 275
 276         case Fdevfd:
 277                 if (cnp->cn_namelen == 2 && bcmp(pname, "..", 2) == 0) {
 278                         if (error = fdesc_root(dvp->v_mount, vpp))
 279                                 goto bad;
 280                         return (0);
 281                 }
 282
 283                 fd = 0;
 284                 while (*pname >= '0' && *pname <= '9') {
 285                         fd = 10 * fd + *pname++ - '0';
 286                         if (fd >= nfiles)
 287                                 break;
 288                 }
 289
 290                 if (*pname != '\0') {
 291                         error = ENOENT;
 292                         goto bad;
 293                 }
 294
 295                 if (fd >= nfiles ||
 296                                 *fdfile(p, fd) == NULL ||
 297                                 (*fdflags(p, fd) & UF_RESERVED)) {
 298                         error = EBADF;
 299                         goto bad;
 300                 }
 301
 302                 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp);
 303                 if (error)
 304                         goto bad;
 305                 VTOFDESC(fvp)->fd_fd = fd;
 306                 vn_lock(fvp, LK_SHARED | LK_RETRY, p);
 307                 *vpp = fvp;
 308                 return (0);
 309         }
 310
 311 bad:;
 312         vn_lock(dvp, LK_SHARED | LK_RETRY, p);
 313         *vpp = NULL;
 314         return (error);
 315 }
 316
 317 int
 318 fdesc_open(ap)
 319         struct vop_open_args /* {
 320                 struct vnode *a_vp;
 321                 int  a_mode;
 322                 struct ucred *a_cred;
 323                 struct proc *a_p;
 324         } */ *ap;
 325 {
 326         struct vnode *vp = ap->a_vp;
 327         int error = 0;
 328
 329         switch (VTOFDESC(vp)->fd_type) {
 330         case Fdesc:
 331                 /*
 332                  * XXX Kludge: set p->p_dupfd to contain the value of the
 333                  * the file descriptor being sought for duplication. The error
 334                  * return ensures that the vnode for this device will be
 335                  * released by vn_open. Open will detect this special error and
 336                  * take the actions in dupfdopen.  Other callers of vn_open or
 337                  * VOP_OPEN will simply report the error.
 338                  */
 339                 ap->a_p->p_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
 340                 error = ENODEV;
 341                 break;
 342
 343         case Fctty:
 344                 error = cttyopen(devctty, ap->a_mode, 0, ap->a_p);
 345                 break;
 346         }
 347
 348         return (error);
 349 }
 350
 351 static int
 352 fdesc_attr(fd, vap, cred, p)
 353         int fd;
 354         struct vattr *vap;
 355         struct ucred *cred;
 356         struct proc *p;
 357 {
 358         struct file *fp;
 359         struct stat stb;
 360         int error;
 361
 362         if (error = fdgetf(p, fd, &fp))
 363                 return (error);
 364         switch (fp->f_type) {
 365         case DTYPE_VNODE:
 366                 error = VOP_GETATTR((struct vnode *) fp->f_data, vap, cred, p);
 367                 if (error == 0 && vap->va_type == VDIR) {
 368                         /*
 369                          * directories can cause loops in the namespace,
 370                          * so turn off the 'x' bits to avoid trouble.
 371                          */
 372                         vap->va_mode &= ~((VEXEC)|(VEXEC>>3)|(VEXEC>>6));
 373                 }
 374                 break;
 375
 376         case DTYPE_SOCKET:
 377                 error = soo_stat((struct socket *)fp->f_data, &stb);
 378                 if (error == 0) {
 379                         vattr_null(vap);
 380                         vap->va_type = VSOCK;
 381                         vap->va_mode = stb.st_mode;
 382                         vap->va_nlink = stb.st_nlink;
 383                         vap->va_uid = stb.st_uid;
 384                         vap->va_gid = stb.st_gid;
 385                         vap->va_fsid = stb.st_dev;
 386                         vap->va_fileid = stb.st_ino;
 387                         vap->va_size = stb.st_size;
 388                         vap->va_blocksize = stb.st_blksize;
 389                         vap->va_atime = stb.st_atimespec;
 390                         vap->va_mtime = stb.st_mtimespec;
 391                         vap->va_ctime = stb.st_ctimespec;
 392                         vap->va_gen = stb.st_gen;
 393                         vap->va_flags = stb.st_flags;
 394                         vap->va_rdev = stb.st_rdev;
 395                         vap->va_bytes = stb.st_blocks * stb.st_blksize;
 396                 }
 397                 break;
 398
 399         default:
 400                 panic("fdesc attr");
 401                 break;
 402         }
 403
 404         return (error);
 405 }
 406
 407 int
 408 fdesc_getattr(ap)
 409         struct vop_getattr_args /* {
 410                 struct vnode *a_vp;
 411                 struct vattr *a_vap;
 412                 struct ucred *a_cred;
 413                 struct proc *a_p;
 414         } */ *ap;
 415 {
 416         struct vnode *vp = ap->a_vp;
 417         struct vattr *vap = ap->a_vap;
 418         unsigned fd;
 419         int error = 0;
 420
 421         switch (VTOFDESC(vp)->fd_type) {
 422         case Froot:
 423         case Fdevfd:
 424         case Flink:
 425         case Fctty:
 426                 bzero((caddr_t) vap, sizeof(*vap));
 427                 vattr_null(vap);
 428                 vap->va_fileid = VTOFDESC(vp)->fd_ix;
 429
 430                 vap->va_uid = 0;
 431                 vap->va_gid = 0;
 432                 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
 433                 vap->va_blocksize = DEV_BSIZE;
 434                 vap->va_atime.tv_sec = boottime.tv_sec;
 435                 vap->va_atime.tv_nsec = 0;
 436                 vap->va_mtime = vap->va_atime;
 437                 vap->va_ctime = vap->va_mtime;
 438                 vap->va_gen = 0;
 439                 vap->va_flags = 0;
 440                 vap->va_rdev = 0;
 441                 vap->va_bytes = 0;
 442
 443                 switch (VTOFDESC(vp)->fd_type) {
 444                 case Flink:
 445                         vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
 446                         vap->va_type = VLNK;
 447                         vap->va_nlink = 1;
 448                         vap->va_size = strlen(VTOFDESC(vp)->fd_link);
 449                         break;
 450
 451                 case Fctty:
 452                         vap->va_mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
 453                         vap->va_type = VCHR;
 454                         vap->va_nlink = 1;
 455                         vap->va_size = 0;
 456                         vap->va_rdev = devctty;
 457                         break;
 458
 459                 default:
 460                         vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
 461                         vap->va_type = VDIR;
 462                         vap->va_nlink = 2;
 463                         vap->va_size = DEV_BSIZE;
 464                         break;
 465                 }
 466                 break;
 467
 468         case Fdesc:
 469                 fd = VTOFDESC(vp)->fd_fd;
 470                 error = fdesc_attr(fd, vap, ap->a_cred, ap->a_p);
 471                 break;
 472
 473         default:
 474                 panic("fdesc_getattr");
 475                 break;
 476         }
 477
 478         if (error == 0) {
 479                 vp->v_type = vap->va_type;
 480         }
 481
 482         return (error);
 483 }
 484
 485 int
 486 fdesc_setattr(ap)
 487         struct vop_setattr_args /* {
 488                 struct vnode *a_vp;
 489                 struct vattr *a_vap;
 490                 struct ucred *a_cred;
 491                 struct proc *a_p;
 492         } */ *ap;
 493 {
 494         struct file *fp;
 495         unsigned fd;
 496         int error;
 497
 498         /*
 499          * Can't mess with the root vnode
 500          */
 501         switch (VTOFDESC(ap->a_vp)->fd_type) {
 502         case Fdesc:
 503                 break;
 504
 505         case Fctty:
 506                 return (0);
 507
 508         default:
 509                 return (EACCES);
 510         }
 511
 512         fd = VTOFDESC(ap->a_vp)->fd_fd;
 513         if (error = fdgetf(ap->a_p, fd, &fp))
 514                 return (error);
 515
 516         /*
 517          * Can setattr the underlying vnode, but not sockets!
 518          */
 519         switch (fp->f_type) {
 520         case DTYPE_VNODE:
 521                 error = VOP_SETATTR((struct vnode *) fp->f_data, ap->a_vap, ap->a_cred, ap->a_p);
 522                 break;
 523
 524         case DTYPE_SOCKET:
 525                 error = 0;
 526                 break;
 527
 528         default:
 529                 kprintf("fp->f_type = %d\n", fp->f_type);
 530         error = EBADF;
 531                 break;
 532         }
 533
 534         return (error);
 535 }
 536
 537 #define UIO_MX 16
 538
 539 static struct dirtmp {
 540         u_long d_fileno;
 541         u_short d_reclen;
 542         u_short d_namlen;
 543         char d_name[8];
 544 } rootent[] = {
 545         { FD_DEVFD, UIO_MX, 2, "fd" },
 546         { FD_STDIN, UIO_MX, 5, "stdin" },
 547         { FD_STDOUT, UIO_MX, 6, "stdout" },
 548         { FD_STDERR, UIO_MX, 6, "stderr" },
 549         { FD_CTTY, UIO_MX, 3, "tty" },
 550         { 0 }
 551 };
 552
 553 int
 554 fdesc_readdir(ap)
 555         struct vop_readdir_args /* {
 556                 struct vnode *a_vp;
 557                 struct uio *a_uio;
 558                 struct ucred *a_cred;
 559                 int *a_eofflag;
 560                 u_long *a_cookies;
 561                 int a_ncookies;
 562         } */ *ap;
 563 {
 564         struct uio *uio = ap->a_uio;
 565         struct proc *p = uio->uio_procp;
 566         int i, error;
 567
 568         /*
 569          * We don't allow exporting fdesc mounts, and currently local
 570          * requests do not need cookies.
 571          */
 572         if (ap->a_ncookies)
 573                 panic("fdesc_readdir: not hungry");
 574
 575         switch (VTOFDESC(ap->a_vp)->fd_type) {
 576         case Fctty:
 577                 return (0);
 578
 579         case Fdesc:
 580                 return (ENOTDIR);
 581
 582         default:
 583                 break;
 584         }
 585
 586         if (VTOFDESC(ap->a_vp)->fd_type == Froot) {
 587                 struct dirent d;
 588                 struct dirent *dp = &d;
 589                 struct dirtmp *dt;
 590                 int fd;
 591
 592                 i = uio->uio_offset / UIO_MX;
 593                 error = 0;
 594
 595                 while (uio->uio_resid > 0) {
 596                         dt = &rootent[i];
 597                         if (dt->d_fileno == 0) {
 598                                 /**eofflagp = 1;*/
 599                                 break;
 600                         }
 601                         i++;
 602
 603                         switch (dt->d_fileno) {
 604                         case FD_CTTY:
 605                                 if (cttyvp(uio->uio_procp) == NULL)
 606                                         continue;
 607                                 break;
 608
 609                         case FD_STDIN:
 610                         case FD_STDOUT:
 611                         case FD_STDERR:
 612                                 fd = dt->d_fileno - FD_STDIN;
 613                                 if (fd >= p->p_fd->fd_nfiles)
 614                                         continue;
 615                                 if (*fdfile(p, fd) == NULL &&
 616                                                 !(*fdflags(p, fd) &
 617                                                         UF_RESERVED))
 618                                         continue;
 619                                 break;
 620                         }
 621                         bzero((caddr_t) dp, UIO_MX);
 622                         dp->d_fileno = dt->d_fileno;
 623                         dp->d_namlen = dt->d_namlen;
 624                         dp->d_type = DT_UNKNOWN;
 625                         dp->d_reclen = dt->d_reclen;
 626                         bcopy(dt->d_name, dp->d_name, dp->d_namlen+1);
 627                         error = uiomove((caddr_t) dp, UIO_MX, uio);
 628                         if (error)
 629                                 break;
 630                 }
 631                 uio->uio_offset = i * UIO_MX;
 632                 return (error);
 633         }
 634
 635         i = uio->uio_offset / UIO_MX;
 636         error = 0;
 637         while (uio->uio_resid > 0) {
 638                 if (i >= p->p_fd->fd_nfiles)
 639                         break;
 640
 641                 if (*fdfile(p, i) != NULL && !(*fdflags(p, i) & UF_RESERVED)) {
 642                         struct dirent d;
 643                         struct dirent *dp = &d;
 644
 645                         bzero((caddr_t) dp, UIO_MX);
 646
 647                         dp->d_namlen = sprintf(dp->d_name, "%d", i);
 648                         dp->d_reclen = UIO_MX;
 649                         dp->d_type = DT_UNKNOWN;
 650                         dp->d_fileno = i + FD_STDIN;
 651                         /*
 652                          * And ship to userland
 653                          */
 654                         error = uiomove((caddr_t) dp, UIO_MX, uio);
 655                         if (error)
 656                                 break;
 657                 }
 658                 i++;
 659         }
 660
 661         uio->uio_offset = i * UIO_MX;
 662         return (error);
 663 }
 664
 665 int
 666 fdesc_readlink(ap)
 667         struct vop_readlink_args /* {
 668                 struct vnode *a_vp;
 669                 struct uio *a_uio;
 670                 struct ucred *a_cred;
 671         } */ *ap;
 672 {
 673         struct vnode *vp = ap->a_vp;
 674         int error;
 675
 676         if (vp->v_type != VLNK)
 677                 return (EPERM);
 678
 679         if (VTOFDESC(vp)->fd_type == Flink) {
 680                 char *ln = VTOFDESC(vp)->fd_link;
 681                 error = uiomove(ln, strlen(ln), ap->a_uio);
 682         } else {
 683                 error = EOPNOTSUPP;
 684         }
 685
 686         return (error);
 687 }
 688
 689 int
 690 fdesc_read(ap)
 691         struct vop_read_args /* {
 692                 struct vnode *a_vp;
 693                 struct uio *a_uio;
 694                 int  a_ioflag;
 695                 struct ucred *a_cred;
 696         } */ *ap;
 697 {
 698         int error = EOPNOTSUPP;
 699
 700         switch (VTOFDESC(ap->a_vp)->fd_type) {
 701         case Fctty:
 702                 error = cttyread(devctty, ap->a_uio, ap->a_ioflag);
 703                 break;
 704
 705         default:
 706                 error = EOPNOTSUPP;
 707                 break;
 708         }
 709
 710         return (error);
 711 }
 712
 713 int
 714 fdesc_write(ap)
 715         struct vop_write_args /* {
 716                 struct vnode *a_vp;
 717                 struct uio *a_uio;
 718                 int  a_ioflag;
 719                 struct ucred *a_cred;
 720         } */ *ap;
 721 {
 722         int error = EOPNOTSUPP;
 723
 724         switch (VTOFDESC(ap->a_vp)->fd_type) {
 725         case Fctty:
 726                 error = cttywrite(devctty, ap->a_uio, ap->a_ioflag);
 727                 break;
 728
 729         default:
 730                 error = EOPNOTSUPP;
 731                 break;
 732         }
 733
 734         return (error);
 735 }
 736
 737 int
 738 fdesc_ioctl(ap)
 739         struct vop_ioctl_args /* {
 740                 struct vnode *a_vp;
 741                 int  a_command;
 742                 caddr_t  a_data;
 743                 int  a_fflag;
 744                 struct ucred *a_cred;
 745                 struct proc *a_p;
 746         } */ *ap;
 747 {
 748         int error = EOPNOTSUPP;
 749
 750         switch (VTOFDESC(ap->a_vp)->fd_type) {
 751         case Fctty:
 752                 error = cttyioctl(devctty, ap->a_command, ap->a_data,
 753                                         ap->a_fflag, ap->a_p);
 754                 break;
 755
 756         default:
 757                 error = EOPNOTSUPP;
 758                 break;
 759         }
 760
 761         return (error);
 762 }
 763
 764 int
 765 fdesc_select(ap)
 766         struct vop_select_args /* {
 767                 struct vnode *a_vp;
 768                 int  a_which;
 769                 int  a_fflags;
 770                 struct ucred *a_cred;
 771                 struct proc *a_p;
 772         } */ *ap;
 773 {
 774         int error = EOPNOTSUPP;
 775
 776         switch (VTOFDESC(ap->a_vp)->fd_type) {
 777         case Fctty:
 778                 error = cttyselect(devctty, ap->a_fflags, ap->a_p);
 779                 break;
 780
 781         default:
 782                 error = EOPNOTSUPP;
 783                 break;
 784         }
 785
 786         return (error);
 787 }
 788
 789 int
 790 fdesc_inactive(ap)
 791         struct vop_inactive_args /* {
 792                 struct vnode *a_vp;
 793                 struct proc *a_p;
 794         } */ *ap;
 795 {
 796         struct vnode *vp = ap->a_vp;
 797
 798         /*
 799          * Clear out the v_type field to avoid
 800          * nasty things happening in vgone().
 801          */
 802         VOP_UNLOCK(vp, 0, ap->a_p);
 803         vp->v_type = VNON;
 804         return (0);
 805 }
 806
 807 int
 808 fdesc_reclaim(ap)
 809         struct vop_reclaim_args /* {
 810                 struct vnode *a_vp;
 811         } */ *ap;
 812 {
 813         struct vnode *vp = ap->a_vp;
 814         struct fdescnode *fd = VTOFDESC(vp);
 815
 816         LIST_REMOVE(fd, fd_hash);
 817         FREE(vp->v_data, M_TEMP);
 818         vp->v_data = 0;
 819
 820         return (0);
 821 }
 822
 823 /*
 824  * Return POSIX pathconf information applicable to special devices.
 825  */
 826 fdesc_pathconf(ap)
 827         struct vop_pathconf_args /* {
 828                 struct vnode *a_vp;
 829                 int a_name;
 830                 int *a_retval;
 831         } */ *ap;
 832 {
 833
 834         switch (ap->a_name) {
 835         case _PC_LINK_MAX:
 836                 *ap->a_retval = LINK_MAX;
 837                 return (0);
 838         case _PC_MAX_CANON:
 839                 *ap->a_retval = MAX_CANON;
 840                 return (0);
 841         case _PC_MAX_INPUT:
 842                 *ap->a_retval = MAX_INPUT;
 843                 return (0);
 844         case _PC_PIPE_BUF:
 845                 *ap->a_retval = PIPE_BUF;
 846                 return (0);
 847         case _PC_CHOWN_RESTRICTED:
 848                 *ap->a_retval = 1;
 849                 return (0);
 850         case _PC_VDISABLE:
 851                 *ap->a_retval = _POSIX_VDISABLE;
 852                 return (0);
 853         default:
 854                 return (EINVAL);
 855         }
 856         /* NOTREACHED */
 857 }
 858
 859 /*
 860  * Print out the contents of a /dev/fd vnode.
 861  */
 862 /* ARGSUSED */
 863 int
 864 fdesc_print(ap)
 865         struct vop_print_args /* {
 866                 struct vnode *a_vp;
 867         } */ *ap;
 868 {
 869
 870         printf("tag VT_NON, fdesc vnode\n");
 871         return (0);
 872 }
 873
 874 /*void*/
 875 int
 876 fdesc_vfree(ap)
 877         struct vop_vfree_args /* {
 878                 struct vnode *a_pvp;
 879                 ino_t a_ino;
 880                 int a_mode;
 881         } */ *ap;
 882 {
 883
 884         return (0);
 885 }
 886
 887 /*
 888  * /dev/fd "should never get here" operation
 889  */
 890 int
 891 fdesc_badop()
 892 {
 893
 894         panic("fdesc: bad op");
 895         /* NOTREACHED */
 896 }
 897
 898 #define VOPFUNC int (*)(void *)
 899
 900 #define fdesc_create ((int (*) __P((struct  vop_create_args *)))eopnotsupp)
 901 #define fdesc_mknod ((int (*) __P((struct  vop_mknod_args *)))eopnotsupp)
 902 #define fdesc_close ((int (*) __P((struct  vop_close_args *)))nullop)
 903 #define fdesc_access ((int (*) __P((struct  vop_access_args *)))nullop)
 904 #define fdesc_mmap ((int (*) __P((struct  vop_mmap_args *)))eopnotsupp)
 905 #define fdesc_revoke vop_revoke
 906 #define fdesc_fsync ((int (*) __P((struct  vop_fsync_args *)))nullop)
 907 #define fdesc_seek ((int (*) __P((struct  vop_seek_args *)))nullop)
 908 #define fdesc_remove ((int (*) __P((struct  vop_remove_args *)))eopnotsupp)
 909 #define fdesc_link ((int (*) __P((struct  vop_link_args *)))eopnotsupp)
 910 #define fdesc_rename ((int (*) __P((struct  vop_rename_args *)))eopnotsupp)
 911 #define fdesc_mkdir ((int (*) __P((struct  vop_mkdir_args *)))eopnotsupp)
 912 #define fdesc_rmdir ((int (*) __P((struct  vop_rmdir_args *)))eopnotsupp)
 913 #define fdesc_symlink ((int (*) __P((struct vop_symlink_args *)))eopnotsupp)
 914 #define fdesc_abortop ((int (*) __P((struct  vop_abortop_args *)))nullop)
 915 #define fdesc_lock ((int (*) __P((struct  vop_lock_args *)))vop_nolock)
 916 #define fdesc_unlock ((int (*) __P((struct  vop_unlock_args *)))vop_nounlock)
 917 #define fdesc_bmap ((int (*) __P((struct  vop_bmap_args *)))fdesc_badop)
 918 #define fdesc_strategy ((int (*) __P((struct  vop_strategy_args *)))fdesc_badop)
 919 #define fdesc_islocked \
 920         ((int (*) __P((struct vop_islocked_args *)))vop_noislocked)
 921 #define fdesc_advlock ((int (*) __P((struct vop_advlock_args *)))eopnotsupp)
 922 #define fdesc_blkatoff \
 923         ((int (*) __P((struct  vop_blkatoff_args *)))eopnotsupp)
 924 #define fdesc_valloc ((int(*) __P(( \
 925                 struct vnode *pvp, \
 926                 int mode, \
 927                 struct ucred *cred, \
 928                 struct vnode **vpp))) eopnotsupp)
 929 #define fdesc_truncate \
 930         ((int (*) __P((struct  vop_truncate_args *)))eopnotsupp)
 931 #define fdesc_update ((int (*) __P((struct  vop_update_args *)))eopnotsupp)
 932 #define fdesc_bwrite ((int (*) __P((struct  vop_bwrite_args *)))eopnotsupp)
 933 #define fdesc_blktooff ((int (*) __P((struct  vop_blktooff_args *)))eopnotsupp)
 934 #define fdesc_offtoblk ((int (*) __P((struct  vop_offtoblk_args *)))eopnotsupp)
 935 #define fdesc_cmap ((int (*) __P((struct  vop_cmap_args *)))eopnotsupp)
 936
 937 int (**fdesc_vnodeop_p)(void *);
 938 struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = {
 939         { &vop_default_desc, (VOPFUNC)vn_default_error },
 940         { &vop_lookup_desc, (VOPFUNC)fdesc_lookup },    /* lookup */
 941         { &vop_create_desc, (VOPFUNC)fdesc_create },    /* create */
 942         { &vop_mknod_desc, (VOPFUNC)fdesc_mknod },      /* mknod */
 943         { &vop_open_desc, (VOPFUNC)fdesc_open },        /* open */
 944         { &vop_close_desc, (VOPFUNC)fdesc_close },      /* close */
 945         { &vop_access_desc, (VOPFUNC)fdesc_access },    /* access */
 946         { &vop_getattr_desc, (VOPFUNC)fdesc_getattr },  /* getattr */
 947         { &vop_setattr_desc, (VOPFUNC)fdesc_setattr },  /* setattr */
 948         { &vop_read_desc, (VOPFUNC)fdesc_read },        /* read */
 949         { &vop_write_desc, (VOPFUNC)fdesc_write },      /* write */
 950         { &vop_ioctl_desc, (VOPFUNC)fdesc_ioctl },      /* ioctl */
 951         { &vop_select_desc, (VOPFUNC)fdesc_select },    /* select */
 952         { &vop_revoke_desc, (VOPFUNC)fdesc_revoke },    /* revoke */
 953         { &vop_mmap_desc, (VOPFUNC)fdesc_mmap },        /* mmap */
 954         { &vop_fsync_desc, (VOPFUNC)fdesc_fsync },      /* fsync */
 955         { &vop_seek_desc, (VOPFUNC)fdesc_seek },        /* seek */
 956         { &vop_remove_desc, (VOPFUNC)fdesc_remove },    /* remove */
 957         { &vop_link_desc, (VOPFUNC)fdesc_link },        /* link */
 958         { &vop_rename_desc, (VOPFUNC)fdesc_rename },    /* rename */
 959         { &vop_mkdir_desc, (VOPFUNC)fdesc_mkdir },      /* mkdir */
 960         { &vop_rmdir_desc, (VOPFUNC)fdesc_rmdir },      /* rmdir */
 961         { &vop_symlink_desc, (VOPFUNC)fdesc_symlink },  /* symlink */
 962         { &vop_readdir_desc, (VOPFUNC)fdesc_readdir },  /* readdir */
 963         { &vop_readlink_desc, (VOPFUNC)fdesc_readlink },/* readlink */
 964         { &vop_abortop_desc, (VOPFUNC)fdesc_abortop },  /* abortop */
 965         { &vop_inactive_desc, (VOPFUNC)fdesc_inactive },/* inactive */
 966         { &vop_reclaim_desc, (VOPFUNC)fdesc_reclaim },  /* reclaim */
 967         { &vop_lock_desc, (VOPFUNC)fdesc_lock },        /* lock */
 968         { &vop_unlock_desc, (VOPFUNC)fdesc_unlock },    /* unlock */
 969         { &vop_bmap_desc, (VOPFUNC)fdesc_bmap },        /* bmap */
 970         { &vop_strategy_desc, (VOPFUNC)fdesc_strategy },        /* strategy */
 971         { &vop_print_desc, (VOPFUNC)fdesc_print },      /* print */
 972         { &vop_islocked_desc, (VOPFUNC)fdesc_islocked },        /* islocked */
 973         { &vop_pathconf_desc, (VOPFUNC)fdesc_pathconf },        /* pathconf */
 974         { &vop_advlock_desc, (VOPFUNC)fdesc_advlock },  /* advlock */
 975         { &vop_blkatoff_desc, (VOPFUNC)fdesc_blkatoff },        /* blkatoff */
 976         { &vop_valloc_desc, (VOPFUNC)fdesc_valloc },    /* valloc */
 977         { &vop_vfree_desc, (VOPFUNC)fdesc_vfree },      /* vfree */
 978         { &vop_truncate_desc, (VOPFUNC)fdesc_truncate },        /* truncate */
 979         { &vop_update_desc, (VOPFUNC)fdesc_update },    /* update */
 980         { &vop_bwrite_desc, (VOPFUNC)fdesc_bwrite },    /* bwrite */
 981         { &vop_pagein_desc, (VOPFUNC)err_pagein },      /* pagein */
 982         { &vop_pageout_desc, (VOPFUNC)err_pageout },    /* pageout */
 983         { &vop_copyfile_desc, (VOPFUNC)err_copyfile },  /* Copyfile */
 984         { &vop_blktooff_desc, (VOPFUNC)fdesc_blktooff },        /* blktooff */
 985         { &vop_blktooff_desc, (VOPFUNC)fdesc_offtoblk },        /* offtoblk */
 986         { &vop_cmap_desc, (VOPFUNC)fdesc_cmap },        /* cmap */
 987         { (struct vnodeop_desc*)NULL, (VOPFUNC)NULL }
 988 };
 989 struct vnodeopv_desc fdesc_vnodeop_opv_desc =
 990         { &fdesc_vnodeop_p, fdesc_vnodeop_entries };