fdesc_vnops.c revision 1.16
1 /* $NetBSD: fdesc_vnops.c,v 1.16 1994/07/14 20:58:28 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software donated to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * from: Id: fdesc_vnops.c,v 1.12 1993/04/06 16:17:17 jsp Exp 39 * @(#)fdesc_vnops.c 8.9 (Berkeley) 1/21/94 40 */ 41 42 /* 43 * /dev/fd Filesystem 44 */ 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/types.h> 49 #include <sys/time.h> 50 #include <sys/proc.h> 51 #include <sys/kernel.h> /* boottime */ 52 #include <sys/resourcevar.h> 53 #include <sys/filedesc.h> 54 #include <sys/vnode.h> 55 #include <sys/malloc.h> 56 #include <sys/file.h> 57 #include <sys/stat.h> 58 #include <sys/mount.h> 59 #include <sys/namei.h> 60 #include <sys/buf.h> 61 #include <sys/dirent.h> 62 #include <miscfs/fdesc/fdesc.h> 63 64 #define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL) 65 66 #define FDL_WANT 0x01 67 #define FDL_LOCKED 0x02 68 static int fdcache_lock; 69 70 dev_t devctty; 71 72 #if (FD_STDIN != FD_STDOUT-1) || (FD_STDOUT != FD_STDERR-1) 73 FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n+1, n+2 74 #endif 75 76 #define NFDCACHE 4 77 #define FD_NHASH(ix) ((ix) & (NFDCACHE-1)) 78 79 /* 80 * Cache head 81 */ 82 struct fdcache { 83 struct fdescnode *fc_forw; 84 struct fdescnode *fc_back; 85 }; 86 87 static struct fdcache fdcache[NFDCACHE]; 88 89 /* 90 * Initialise cache headers 91 */ 92 fdesc_init() 93 { 94 struct fdcache *fc; 95 96 devctty = makedev(nchrdev, 0); 97 98 for (fc = fdcache; fc < fdcache + NFDCACHE; fc++) 99 fc->fc_forw = fc->fc_back = (struct fdescnode *) fc; 100 } 101 102 /* 103 * Compute hash list for given target vnode 104 */ 105 static struct fdcache * 106 fdesc_hash(ix) 107 int ix; 108 { 109 110 return (&fdcache[FD_NHASH(ix)]); 111 } 112 113 int 114 fdesc_allocvp(ftype, ix, mp, vpp) 115 fdntype ftype; 116 int ix; 117 struct mount *mp; 118 struct vnode **vpp; 119 { 120 struct fdcache *fc; 121 struct fdescnode *fd; 122 int error = 0; 123 124 loop: 125 fc = fdesc_hash(ix); 126 for (fd = fc->fc_forw; fd != (struct fdescnode *) fc; fd = fd->fd_forw) { 127 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) { 128 if (vget(fd->fd_vnode, 0)) 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 error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp); 147 if (error) 148 goto out; 149 MALLOC(fd, void *, sizeof(struct fdescnode), M_TEMP, M_WAITOK); 150 (*vpp)->v_data = fd; 151 fd->fd_vnode = *vpp; 152 fd->fd_type = ftype; 153 fd->fd_fd = -1; 154 fd->fd_link = 0; 155 fd->fd_ix = ix; 156 fc = fdesc_hash(ix); 157 insque(fd, fc); 158 159 out:; 160 fdcache_lock &= ~FDL_LOCKED; 161 162 if (fdcache_lock & FDL_WANT) { 163 fdcache_lock &= ~FDL_WANT; 164 wakeup((caddr_t) &fdcache_lock); 165 } 166 167 return (error); 168 } 169 170 /* 171 * vp is the current namei directory 172 * ndp is the name to locate in that directory... 173 */ 174 int 175 fdesc_lookup(ap) 176 struct vop_lookup_args /* { 177 struct vnode * a_dvp; 178 struct vnode ** a_vpp; 179 struct componentname * a_cnp; 180 } */ *ap; 181 { 182 struct vnode **vpp = ap->a_vpp; 183 struct vnode *dvp = ap->a_dvp; 184 char *pname; 185 struct proc *p; 186 int nfiles; 187 unsigned fd; 188 int error; 189 struct vnode *fvp; 190 char *ln; 191 192 pname = ap->a_cnp->cn_nameptr; 193 if (ap->a_cnp->cn_namelen == 1 && *pname == '.') { 194 *vpp = dvp; 195 VREF(dvp); 196 VOP_LOCK(dvp); 197 return (0); 198 } 199 200 p = ap->a_cnp->cn_proc; 201 nfiles = p->p_fd->fd_nfiles; 202 203 switch (VTOFDESC(dvp)->fd_type) { 204 default: 205 case Flink: 206 case Fdesc: 207 case Fctty: 208 error = ENOTDIR; 209 goto bad; 210 211 case Froot: 212 if (ap->a_cnp->cn_namelen == 2 && bcmp(pname, "fd", 2) == 0) { 213 error = fdesc_allocvp(Fdevfd, FD_DEVFD, dvp->v_mount, &fvp); 214 if (error) 215 goto bad; 216 *vpp = fvp; 217 fvp->v_type = VDIR; 218 VOP_LOCK(fvp); 219 return (0); 220 } 221 222 if (ap->a_cnp->cn_namelen == 3 && bcmp(pname, "tty", 3) == 0) { 223 struct vnode *ttyvp = cttyvp(p); 224 if (ttyvp == NULL) { 225 error = ENXIO; 226 goto bad; 227 } 228 error = fdesc_allocvp(Fctty, FD_CTTY, dvp->v_mount, &fvp); 229 if (error) 230 goto bad; 231 *vpp = fvp; 232 fvp->v_type = VFIFO; 233 VOP_LOCK(fvp); 234 return (0); 235 } 236 237 ln = 0; 238 switch (ap->a_cnp->cn_namelen) { 239 case 5: 240 if (bcmp(pname, "stdin", 5) == 0) { 241 ln = "fd/0"; 242 fd = FD_STDIN; 243 } 244 break; 245 case 6: 246 if (bcmp(pname, "stdout", 6) == 0) { 247 ln = "fd/1"; 248 fd = FD_STDOUT; 249 } else 250 if (bcmp(pname, "stderr", 6) == 0) { 251 ln = "fd/2"; 252 fd = FD_STDERR; 253 } 254 break; 255 } 256 257 if (ln) { 258 error = fdesc_allocvp(Flink, fd, dvp->v_mount, &fvp); 259 if (error) 260 goto bad; 261 VTOFDESC(fvp)->fd_link = ln; 262 *vpp = fvp; 263 fvp->v_type = VLNK; 264 VOP_LOCK(fvp); 265 return (0); 266 } else { 267 error = ENOENT; 268 goto bad; 269 } 270 271 /* FALL THROUGH */ 272 273 case Fdevfd: 274 if (ap->a_cnp->cn_namelen == 2 && bcmp(pname, "..", 2) == 0) { 275 error = fdesc_root(dvp->v_mount, vpp); 276 return (error); 277 } 278 279 fd = 0; 280 while (*pname >= '0' && *pname <= '9') { 281 fd = 10 * fd + *pname++ - '0'; 282 if (fd >= nfiles) 283 break; 284 } 285 286 if (*pname != '\0') { 287 error = ENOENT; 288 goto bad; 289 } 290 291 if (fd >= nfiles || p->p_fd->fd_ofiles[fd] == NULL) { 292 error = EBADF; 293 goto bad; 294 } 295 296 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp); 297 if (error) 298 goto bad; 299 VTOFDESC(fvp)->fd_fd = fd; 300 *vpp = fvp; 301 return (0); 302 } 303 304 bad:; 305 *vpp = NULL; 306 return (error); 307 } 308 309 int 310 fdesc_open(ap) 311 struct vop_open_args /* { 312 struct vnode *a_vp; 313 int a_mode; 314 struct ucred *a_cred; 315 struct proc *a_p; 316 } */ *ap; 317 { 318 struct vnode *vp = ap->a_vp; 319 int error = 0; 320 321 switch (VTOFDESC(vp)->fd_type) { 322 case Fdesc: 323 /* 324 * XXX Kludge: set p->p_dupfd to contain the value of the 325 * the file descriptor being sought for duplication. The error 326 * return ensures that the vnode for this device will be 327 * released by vn_open. Open will detect this special error and 328 * take the actions in dupfdopen. Other callers of vn_open or 329 * VOP_OPEN will simply report the error. 330 */ 331 ap->a_p->p_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */ 332 error = ENODEV; 333 break; 334 335 case Fctty: 336 error = cttyopen(devctty, ap->a_mode, 0, ap->a_p); 337 break; 338 } 339 340 return (error); 341 } 342 343 static int 344 fdesc_attr(fd, vap, cred, p) 345 int fd; 346 struct vattr *vap; 347 struct ucred *cred; 348 struct proc *p; 349 { 350 struct filedesc *fdp = p->p_fd; 351 struct file *fp; 352 struct stat stb; 353 int error; 354 355 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL) 356 return (EBADF); 357 358 switch (fp->f_type) { 359 case DTYPE_VNODE: 360 error = VOP_GETATTR((struct vnode *) fp->f_data, vap, cred, p); 361 if (error == 0 && vap->va_type == VDIR) { 362 /* 363 * don't allow directories to show up because 364 * that causes loops in the namespace. 365 */ 366 vap->va_type = VFIFO; 367 } 368 break; 369 370 case DTYPE_SOCKET: 371 error = soo_stat((struct socket *)fp->f_data, &stb); 372 if (error == 0) { 373 vattr_null(vap); 374 vap->va_type = VSOCK; 375 vap->va_mode = stb.st_mode; 376 vap->va_nlink = stb.st_nlink; 377 vap->va_uid = stb.st_uid; 378 vap->va_gid = stb.st_gid; 379 vap->va_fsid = stb.st_dev; 380 vap->va_fileid = stb.st_ino; 381 vap->va_size = stb.st_size; 382 vap->va_blocksize = stb.st_blksize; 383 vap->va_atime = stb.st_atimespec; 384 vap->va_mtime = stb.st_mtimespec; 385 vap->va_ctime = stb.st_ctimespec; 386 vap->va_gen = stb.st_gen; 387 vap->va_flags = stb.st_flags; 388 vap->va_rdev = stb.st_rdev; 389 vap->va_bytes = stb.st_blocks * stb.st_blksize; 390 } 391 break; 392 393 default: 394 panic("fdesc attr"); 395 break; 396 } 397 398 return (error); 399 } 400 401 int 402 fdesc_getattr(ap) 403 struct vop_getattr_args /* { 404 struct vnode *a_vp; 405 struct vattr *a_vap; 406 struct ucred *a_cred; 407 struct proc *a_p; 408 } */ *ap; 409 { 410 struct vnode *vp = ap->a_vp; 411 struct vattr *vap = ap->a_vap; 412 unsigned fd; 413 int error = 0; 414 415 switch (VTOFDESC(vp)->fd_type) { 416 case Froot: 417 case Fdevfd: 418 case Flink: 419 case Fctty: 420 bzero((caddr_t) vap, sizeof(*vap)); 421 vattr_null(vap); 422 vap->va_fileid = VTOFDESC(vp)->fd_ix; 423 424 switch (VTOFDESC(vp)->fd_type) { 425 case Flink: 426 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 427 vap->va_type = VLNK; 428 vap->va_nlink = 1; 429 vap->va_size = strlen(VTOFDESC(vp)->fd_link); 430 break; 431 432 case Fctty: 433 vap->va_mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH; 434 vap->va_type = VFIFO; 435 vap->va_nlink = 1; 436 vap->va_size = 0; 437 break; 438 439 default: 440 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 441 vap->va_type = VDIR; 442 vap->va_nlink = 2; 443 vap->va_size = DEV_BSIZE; 444 break; 445 } 446 vap->va_uid = 0; 447 vap->va_gid = 0; 448 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 449 vap->va_blocksize = DEV_BSIZE; 450 vap->va_atime.ts_sec = boottime.tv_sec; 451 vap->va_atime.ts_nsec = 0; 452 vap->va_mtime = vap->va_atime; 453 vap->va_ctime = vap->va_mtime; 454 vap->va_gen = 0; 455 vap->va_flags = 0; 456 vap->va_rdev = 0; 457 vap->va_bytes = 0; 458 break; 459 460 case Fdesc: 461 fd = VTOFDESC(vp)->fd_fd; 462 error = fdesc_attr(fd, vap, ap->a_cred, ap->a_p); 463 break; 464 465 default: 466 panic("fdesc_getattr"); 467 break; 468 } 469 470 if (error == 0) 471 vp->v_type = vap->va_type; 472 473 return (error); 474 } 475 476 int 477 fdesc_setattr(ap) 478 struct vop_setattr_args /* { 479 struct vnode *a_vp; 480 struct vattr *a_vap; 481 struct ucred *a_cred; 482 struct proc *a_p; 483 } */ *ap; 484 { 485 struct filedesc *fdp = ap->a_p->p_fd; 486 struct file *fp; 487 unsigned fd; 488 int error; 489 490 /* 491 * Can't mess with the root vnode 492 */ 493 switch (VTOFDESC(ap->a_vp)->fd_type) { 494 case Fdesc: 495 break; 496 497 case Fctty: 498 return (0); 499 500 default: 501 return (EACCES); 502 } 503 504 fd = VTOFDESC(ap->a_vp)->fd_fd; 505 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL) { 506 return (EBADF); 507 } 508 509 /* 510 * Can setattr the underlying vnode, but not sockets! 511 */ 512 switch (fp->f_type) { 513 case DTYPE_VNODE: 514 error = VOP_SETATTR((struct vnode *) fp->f_data, ap->a_vap, ap->a_cred, ap->a_p); 515 break; 516 517 case DTYPE_SOCKET: 518 error = 0; 519 break; 520 521 default: 522 panic("fdesc setattr"); 523 break; 524 } 525 526 return (error); 527 } 528 529 #define UIO_MX 16 530 531 static struct dirtmp { 532 u_long d_fileno; 533 u_short d_reclen; 534 u_short d_namlen; 535 char d_name[8]; 536 } rootent[] = { 537 { FD_DEVFD, UIO_MX, 2, "fd" }, 538 { FD_STDIN, UIO_MX, 5, "stdin" }, 539 { FD_STDOUT, UIO_MX, 6, "stdout" }, 540 { FD_STDERR, UIO_MX, 6, "stderr" }, 541 { FD_CTTY, UIO_MX, 3, "tty" }, 542 { 0 } 543 }; 544 545 int 546 fdesc_readdir(ap) 547 struct vop_readdir_args /* { 548 struct vnode *a_vp; 549 struct uio *a_uio; 550 struct ucred *a_cred; 551 } */ *ap; 552 { 553 struct uio *uio = ap->a_uio; 554 struct filedesc *fdp; 555 int i; 556 int error; 557 558 switch (VTOFDESC(ap->a_vp)->fd_type) { 559 case Fctty: 560 return (0); 561 562 case Fdesc: 563 return (ENOTDIR); 564 565 default: 566 break; 567 } 568 569 fdp = uio->uio_procp->p_fd; 570 571 if (VTOFDESC(ap->a_vp)->fd_type == Froot) { 572 struct dirent d; 573 struct dirent *dp = &d; 574 struct dirtmp *dt; 575 576 i = uio->uio_offset / UIO_MX; 577 error = 0; 578 579 while (uio->uio_resid > 0) { 580 dt = &rootent[i]; 581 if (dt->d_fileno == 0) { 582 /**eofflagp = 1;*/ 583 break; 584 } 585 i++; 586 587 switch (dt->d_fileno) { 588 case FD_CTTY: 589 if (cttyvp(uio->uio_procp) == NULL) 590 continue; 591 break; 592 593 case FD_STDIN: 594 case FD_STDOUT: 595 case FD_STDERR: 596 if ((dt->d_fileno-FD_STDIN) >= fdp->fd_nfiles) 597 continue; 598 if (fdp->fd_ofiles[dt->d_fileno-FD_STDIN] == NULL) 599 continue; 600 break; 601 } 602 bzero((caddr_t) dp, UIO_MX); 603 dp->d_fileno = dt->d_fileno; 604 dp->d_namlen = dt->d_namlen; 605 dp->d_type = DT_UNKNOWN; 606 dp->d_reclen = dt->d_reclen; 607 bcopy(dt->d_name, dp->d_name, dp->d_namlen+1); 608 error = uiomove((caddr_t) dp, UIO_MX, uio); 609 if (error) 610 break; 611 } 612 uio->uio_offset = i * UIO_MX; 613 return (error); 614 } 615 616 i = uio->uio_offset / UIO_MX; 617 error = 0; 618 while (uio->uio_resid > 0) { 619 if (i >= fdp->fd_nfiles) 620 break; 621 622 if (fdp->fd_ofiles[i] != NULL) { 623 struct dirent d; 624 struct dirent *dp = &d; 625 626 bzero((caddr_t) dp, UIO_MX); 627 628 dp->d_namlen = sprintf(dp->d_name, "%d", i); 629 dp->d_reclen = UIO_MX; 630 dp->d_type = DT_UNKNOWN; 631 dp->d_fileno = i + FD_STDIN; 632 /* 633 * And ship to userland 634 */ 635 error = uiomove((caddr_t) dp, UIO_MX, uio); 636 if (error) 637 break; 638 } 639 i++; 640 } 641 642 uio->uio_offset = i * UIO_MX; 643 return (error); 644 } 645 646 int 647 fdesc_readlink(ap) 648 struct vop_readlink_args /* { 649 struct vnode *a_vp; 650 struct uio *a_uio; 651 struct ucred *a_cred; 652 } */ *ap; 653 { 654 struct vnode *vp = ap->a_vp; 655 int error; 656 657 if (vp->v_type != VLNK) 658 return (EPERM); 659 660 if (VTOFDESC(vp)->fd_type == Flink) { 661 char *ln = VTOFDESC(vp)->fd_link; 662 error = uiomove(ln, strlen(ln), ap->a_uio); 663 } else { 664 error = EOPNOTSUPP; 665 } 666 667 return (error); 668 } 669 670 int 671 fdesc_read(ap) 672 struct vop_read_args /* { 673 struct vnode *a_vp; 674 struct uio *a_uio; 675 int a_ioflag; 676 struct ucred *a_cred; 677 } */ *ap; 678 { 679 int error = EOPNOTSUPP; 680 681 switch (VTOFDESC(ap->a_vp)->fd_type) { 682 case Fctty: 683 error = cttyread(devctty, ap->a_uio, ap->a_ioflag); 684 break; 685 686 default: 687 error = EOPNOTSUPP; 688 break; 689 } 690 691 return (error); 692 } 693 694 int 695 fdesc_write(ap) 696 struct vop_write_args /* { 697 struct vnode *a_vp; 698 struct uio *a_uio; 699 int a_ioflag; 700 struct ucred *a_cred; 701 } */ *ap; 702 { 703 int error = EOPNOTSUPP; 704 705 switch (VTOFDESC(ap->a_vp)->fd_type) { 706 case Fctty: 707 error = cttywrite(devctty, ap->a_uio, ap->a_ioflag); 708 break; 709 710 default: 711 error = EOPNOTSUPP; 712 break; 713 } 714 715 return (error); 716 } 717 718 int 719 fdesc_ioctl(ap) 720 struct vop_ioctl_args /* { 721 struct vnode *a_vp; 722 int a_command; 723 caddr_t a_data; 724 int a_fflag; 725 struct ucred *a_cred; 726 struct proc *a_p; 727 } */ *ap; 728 { 729 int error = EOPNOTSUPP; 730 731 switch (VTOFDESC(ap->a_vp)->fd_type) { 732 case Fctty: 733 error = cttyioctl(devctty, ap->a_command, ap->a_data, 734 ap->a_fflag, ap->a_p); 735 break; 736 737 default: 738 error = EOPNOTSUPP; 739 break; 740 } 741 742 return (error); 743 } 744 745 int 746 fdesc_select(ap) 747 struct vop_select_args /* { 748 struct vnode *a_vp; 749 int a_which; 750 int a_fflags; 751 struct ucred *a_cred; 752 struct proc *a_p; 753 } */ *ap; 754 { 755 int error = EOPNOTSUPP; 756 757 switch (VTOFDESC(ap->a_vp)->fd_type) { 758 case Fctty: 759 error = cttyselect(devctty, ap->a_fflags, ap->a_p); 760 break; 761 762 default: 763 error = EOPNOTSUPP; 764 break; 765 } 766 767 return (error); 768 } 769 770 int 771 fdesc_inactive(ap) 772 struct vop_inactive_args /* { 773 struct vnode *a_vp; 774 } */ *ap; 775 { 776 struct vnode *vp = ap->a_vp; 777 778 /* 779 * Clear out the v_type field to avoid 780 * nasty things happening in vgone(). 781 */ 782 vp->v_type = VNON; 783 return (0); 784 } 785 786 int 787 fdesc_reclaim(ap) 788 struct vop_reclaim_args /* { 789 struct vnode *a_vp; 790 } */ *ap; 791 { 792 struct vnode *vp = ap->a_vp; 793 794 remque(VTOFDESC(vp)); 795 FREE(vp->v_data, M_TEMP); 796 vp->v_data = 0; 797 798 return (0); 799 } 800 801 /* 802 * Return POSIX pathconf information applicable to special devices. 803 */ 804 fdesc_pathconf(ap) 805 struct vop_pathconf_args /* { 806 struct vnode *a_vp; 807 int a_name; 808 int *a_retval; 809 } */ *ap; 810 { 811 812 switch (ap->a_name) { 813 case _PC_LINK_MAX: 814 *ap->a_retval = LINK_MAX; 815 return (0); 816 case _PC_MAX_CANON: 817 *ap->a_retval = MAX_CANON; 818 return (0); 819 case _PC_MAX_INPUT: 820 *ap->a_retval = MAX_INPUT; 821 return (0); 822 case _PC_PIPE_BUF: 823 *ap->a_retval = PIPE_BUF; 824 return (0); 825 case _PC_CHOWN_RESTRICTED: 826 *ap->a_retval = 1; 827 return (0); 828 case _PC_VDISABLE: 829 *ap->a_retval = _POSIX_VDISABLE; 830 return (0); 831 default: 832 return (EINVAL); 833 } 834 /* NOTREACHED */ 835 } 836 837 /* 838 * Print out the contents of a /dev/fd vnode. 839 */ 840 /* ARGSUSED */ 841 int 842 fdesc_print(ap) 843 struct vop_print_args /* { 844 struct vnode *a_vp; 845 } */ *ap; 846 { 847 848 printf("tag VT_NON, fdesc vnode\n"); 849 return (0); 850 } 851 852 /*void*/ 853 int 854 fdesc_vfree(ap) 855 struct vop_vfree_args /* { 856 struct vnode *a_pvp; 857 ino_t a_ino; 858 int a_mode; 859 } */ *ap; 860 { 861 862 return (0); 863 } 864 865 /* 866 * /dev/fd vnode unsupported operation 867 */ 868 int 869 fdesc_enotsupp() 870 { 871 872 return (EOPNOTSUPP); 873 } 874 875 /* 876 * /dev/fd "should never get here" operation 877 */ 878 int 879 fdesc_badop() 880 { 881 882 panic("fdesc: bad op"); 883 /* NOTREACHED */ 884 } 885 886 /* 887 * /dev/fd vnode null operation 888 */ 889 int 890 fdesc_nullop() 891 { 892 893 return (0); 894 } 895 896 #define fdesc_create ((int (*) __P((struct vop_create_args *)))fdesc_enotsupp) 897 #define fdesc_mknod ((int (*) __P((struct vop_mknod_args *)))fdesc_enotsupp) 898 #define fdesc_close ((int (*) __P((struct vop_close_args *)))nullop) 899 #define fdesc_access ((int (*) __P((struct vop_access_args *)))nullop) 900 #define fdesc_mmap ((int (*) __P((struct vop_mmap_args *)))fdesc_enotsupp) 901 #define fdesc_fsync ((int (*) __P((struct vop_fsync_args *)))nullop) 902 #define fdesc_seek ((int (*) __P((struct vop_seek_args *)))nullop) 903 #define fdesc_remove ((int (*) __P((struct vop_remove_args *)))fdesc_enotsupp) 904 #define fdesc_link ((int (*) __P((struct vop_link_args *)))fdesc_enotsupp) 905 #define fdesc_rename ((int (*) __P((struct vop_rename_args *)))fdesc_enotsupp) 906 #define fdesc_mkdir ((int (*) __P((struct vop_mkdir_args *)))fdesc_enotsupp) 907 #define fdesc_rmdir ((int (*) __P((struct vop_rmdir_args *)))fdesc_enotsupp) 908 #define fdesc_symlink ((int (*) __P((struct vop_symlink_args *)))fdesc_enotsupp) 909 #define fdesc_abortop ((int (*) __P((struct vop_abortop_args *)))nullop) 910 #define fdesc_lock ((int (*) __P((struct vop_lock_args *)))nullop) 911 #define fdesc_unlock ((int (*) __P((struct vop_unlock_args *)))nullop) 912 #define fdesc_bmap ((int (*) __P((struct vop_bmap_args *)))fdesc_badop) 913 #define fdesc_strategy ((int (*) __P((struct vop_strategy_args *)))fdesc_badop) 914 #define fdesc_islocked ((int (*) __P((struct vop_islocked_args *)))nullop) 915 #define fdesc_advlock ((int (*) __P((struct vop_advlock_args *)))fdesc_enotsupp) 916 #define fdesc_blkatoff \ 917 ((int (*) __P((struct vop_blkatoff_args *)))fdesc_enotsupp) 918 #define fdesc_vget ((int (*) __P((struct vop_vget_args *)))fdesc_enotsupp) 919 #define fdesc_valloc ((int(*) __P(( \ 920 struct vnode *pvp, \ 921 int mode, \ 922 struct ucred *cred, \ 923 struct vnode **vpp))) fdesc_enotsupp) 924 #define fdesc_truncate \ 925 ((int (*) __P((struct vop_truncate_args *)))fdesc_enotsupp) 926 #define fdesc_update ((int (*) __P((struct vop_update_args *)))fdesc_enotsupp) 927 #define fdesc_bwrite ((int (*) __P((struct vop_bwrite_args *)))fdesc_enotsupp) 928 929 int (**fdesc_vnodeop_p)(); 930 struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = { 931 { &vop_default_desc, vn_default_error }, 932 { &vop_lookup_desc, fdesc_lookup }, /* lookup */ 933 { &vop_create_desc, fdesc_create }, /* create */ 934 { &vop_mknod_desc, fdesc_mknod }, /* mknod */ 935 { &vop_open_desc, fdesc_open }, /* open */ 936 { &vop_close_desc, fdesc_close }, /* close */ 937 { &vop_access_desc, fdesc_access }, /* access */ 938 { &vop_getattr_desc, fdesc_getattr }, /* getattr */ 939 { &vop_setattr_desc, fdesc_setattr }, /* setattr */ 940 { &vop_read_desc, fdesc_read }, /* read */ 941 { &vop_write_desc, fdesc_write }, /* write */ 942 { &vop_ioctl_desc, fdesc_ioctl }, /* ioctl */ 943 { &vop_select_desc, fdesc_select }, /* select */ 944 { &vop_mmap_desc, fdesc_mmap }, /* mmap */ 945 { &vop_fsync_desc, fdesc_fsync }, /* fsync */ 946 { &vop_seek_desc, fdesc_seek }, /* seek */ 947 { &vop_remove_desc, fdesc_remove }, /* remove */ 948 { &vop_link_desc, fdesc_link }, /* link */ 949 { &vop_rename_desc, fdesc_rename }, /* rename */ 950 { &vop_mkdir_desc, fdesc_mkdir }, /* mkdir */ 951 { &vop_rmdir_desc, fdesc_rmdir }, /* rmdir */ 952 { &vop_symlink_desc, fdesc_symlink }, /* symlink */ 953 { &vop_readdir_desc, fdesc_readdir }, /* readdir */ 954 { &vop_readlink_desc, fdesc_readlink }, /* readlink */ 955 { &vop_abortop_desc, fdesc_abortop }, /* abortop */ 956 { &vop_inactive_desc, fdesc_inactive }, /* inactive */ 957 { &vop_reclaim_desc, fdesc_reclaim }, /* reclaim */ 958 { &vop_lock_desc, fdesc_lock }, /* lock */ 959 { &vop_unlock_desc, fdesc_unlock }, /* unlock */ 960 { &vop_bmap_desc, fdesc_bmap }, /* bmap */ 961 { &vop_strategy_desc, fdesc_strategy }, /* strategy */ 962 { &vop_print_desc, fdesc_print }, /* print */ 963 { &vop_islocked_desc, fdesc_islocked }, /* islocked */ 964 { &vop_pathconf_desc, fdesc_pathconf }, /* pathconf */ 965 { &vop_advlock_desc, fdesc_advlock }, /* advlock */ 966 { &vop_blkatoff_desc, fdesc_blkatoff }, /* blkatoff */ 967 { &vop_valloc_desc, fdesc_valloc }, /* valloc */ 968 { &vop_vfree_desc, fdesc_vfree }, /* vfree */ 969 { &vop_truncate_desc, fdesc_truncate }, /* truncate */ 970 { &vop_update_desc, fdesc_update }, /* update */ 971 { &vop_bwrite_desc, fdesc_bwrite }, /* bwrite */ 972 { (struct vnodeop_desc*)NULL, (int(*)())NULL } 973 }; 974 struct vnodeopv_desc fdesc_vnodeop_opv_desc = 975 { &fdesc_vnodeop_p, fdesc_vnodeop_entries }; 976
Indexes created Wed Oct 22 06:10:02 GMT 2025