fdesc_vnops.c revision 1.29
1 /* $NetBSD: fdesc_vnops.c,v 1.29 1996/02/09 14:45:46 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 * @(#)fdesc_vnops.c 8.12 (Berkeley) 8/20/94 39 * 40 * #Id: fdesc_vnops.c,v 1.12 1993/04/06 16:17:17 jsp Exp # 41 */ 42 43 /* 44 * /dev/fd Filesystem 45 */ 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/types.h> 50 #include <sys/time.h> 51 #include <sys/proc.h> 52 #include <sys/kernel.h> /* boottime */ 53 #include <sys/resourcevar.h> 54 #include <sys/filedesc.h> 55 #include <sys/vnode.h> 56 #include <sys/malloc.h> 57 #include <sys/file.h> 58 #include <sys/stat.h> 59 #include <sys/mount.h> 60 #include <sys/namei.h> 61 #include <sys/buf.h> 62 #include <sys/dirent.h> 63 #include <miscfs/fdesc/fdesc.h> 64 65 #define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL) 66 67 #define FDL_WANT 0x01 68 #define FDL_LOCKED 0x02 69 static int fdcache_lock; 70 71 dev_t devctty; 72 73 #if (FD_STDIN != FD_STDOUT-1) || (FD_STDOUT != FD_STDERR-1) 74 FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n+1, n+2 75 #endif 76 77 #define NFDCACHE 4 78 79 #define FD_NHASH(ix) \ 80 (&fdhashtbl[(ix) & fdhash]) 81 LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl; 82 u_long fdhash; 83 84 /* 85 * Initialise cache headers 86 */ 87 fdesc_init() 88 { 89 90 devctty = makedev(nchrdev, 0); 91 fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash); 92 } 93 94 int 95 fdesc_allocvp(ftype, ix, mp, vpp) 96 fdntype ftype; 97 int ix; 98 struct mount *mp; 99 struct vnode **vpp; 100 { 101 struct fdhashhead *fc; 102 struct fdescnode *fd; 103 int error = 0; 104 105 fc = FD_NHASH(ix); 106 loop: 107 for (fd = fc->lh_first; fd != 0; fd = fd->fd_hash.le_next) { 108 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) { 109 if (vget(fd->fd_vnode, 0)) 110 goto loop; 111 *vpp = fd->fd_vnode; 112 return (error); 113 } 114 } 115 116 /* 117 * otherwise lock the array while we call getnewvnode 118 * since that can block. 119 */ 120 if (fdcache_lock & FDL_LOCKED) { 121 fdcache_lock |= FDL_WANT; 122 sleep((caddr_t) &fdcache_lock, PINOD); 123 goto loop; 124 } 125 fdcache_lock |= FDL_LOCKED; 126 127 error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp); 128 if (error) 129 goto out; 130 MALLOC(fd, void *, sizeof(struct fdescnode), M_TEMP, M_WAITOK); 131 (*vpp)->v_data = fd; 132 fd->fd_vnode = *vpp; 133 fd->fd_type = ftype; 134 fd->fd_fd = -1; 135 fd->fd_link = 0; 136 fd->fd_ix = ix; 137 LIST_INSERT_HEAD(fc, fd, fd_hash); 138 139 out:; 140 fdcache_lock &= ~FDL_LOCKED; 141 142 if (fdcache_lock & FDL_WANT) { 143 fdcache_lock &= ~FDL_WANT; 144 wakeup((caddr_t) &fdcache_lock); 145 } 146 147 return (error); 148 } 149 150 /* 151 * vp is the current namei directory 152 * ndp is the name to locate in that directory... 153 */ 154 int 155 fdesc_lookup(ap) 156 struct vop_lookup_args /* { 157 struct vnode * a_dvp; 158 struct vnode ** a_vpp; 159 struct componentname * a_cnp; 160 } */ *ap; 161 { 162 struct vnode **vpp = ap->a_vpp; 163 struct vnode *dvp = ap->a_dvp; 164 char *pname; 165 struct proc *p; 166 int nfiles; 167 unsigned fd; 168 int error; 169 struct vnode *fvp; 170 char *ln; 171 172 pname = ap->a_cnp->cn_nameptr; 173 if (ap->a_cnp->cn_namelen == 1 && *pname == '.') { 174 *vpp = dvp; 175 VREF(dvp); 176 VOP_LOCK(dvp); 177 return (0); 178 } 179 180 p = ap->a_cnp->cn_proc; 181 nfiles = p->p_fd->fd_nfiles; 182 183 switch (VTOFDESC(dvp)->fd_type) { 184 default: 185 case Flink: 186 case Fdesc: 187 case Fctty: 188 error = ENOTDIR; 189 goto bad; 190 191 case Froot: 192 if (ap->a_cnp->cn_namelen == 2 && bcmp(pname, "fd", 2) == 0) { 193 error = fdesc_allocvp(Fdevfd, FD_DEVFD, dvp->v_mount, &fvp); 194 if (error) 195 goto bad; 196 *vpp = fvp; 197 fvp->v_type = VDIR; 198 VOP_LOCK(fvp); 199 return (0); 200 } 201 202 if (ap->a_cnp->cn_namelen == 3 && bcmp(pname, "tty", 3) == 0) { 203 struct vnode *ttyvp = cttyvp(p); 204 if (ttyvp == NULL) { 205 error = ENXIO; 206 goto bad; 207 } 208 error = fdesc_allocvp(Fctty, FD_CTTY, dvp->v_mount, &fvp); 209 if (error) 210 goto bad; 211 *vpp = fvp; 212 fvp->v_type = VFIFO; 213 VOP_LOCK(fvp); 214 return (0); 215 } 216 217 ln = 0; 218 switch (ap->a_cnp->cn_namelen) { 219 case 5: 220 if (bcmp(pname, "stdin", 5) == 0) { 221 ln = "fd/0"; 222 fd = FD_STDIN; 223 } 224 break; 225 case 6: 226 if (bcmp(pname, "stdout", 6) == 0) { 227 ln = "fd/1"; 228 fd = FD_STDOUT; 229 } else 230 if (bcmp(pname, "stderr", 6) == 0) { 231 ln = "fd/2"; 232 fd = FD_STDERR; 233 } 234 break; 235 } 236 237 if (ln) { 238 error = fdesc_allocvp(Flink, fd, dvp->v_mount, &fvp); 239 if (error) 240 goto bad; 241 VTOFDESC(fvp)->fd_link = ln; 242 *vpp = fvp; 243 fvp->v_type = VLNK; 244 VOP_LOCK(fvp); 245 return (0); 246 } else { 247 error = ENOENT; 248 goto bad; 249 } 250 251 /* FALL THROUGH */ 252 253 case Fdevfd: 254 if (ap->a_cnp->cn_namelen == 2 && bcmp(pname, "..", 2) == 0) { 255 error = fdesc_root(dvp->v_mount, vpp); 256 return (error); 257 } 258 259 fd = 0; 260 while (*pname >= '0' && *pname <= '9') { 261 fd = 10 * fd + *pname++ - '0'; 262 if (fd >= nfiles) 263 break; 264 } 265 266 if (*pname != '\0') { 267 error = ENOENT; 268 goto bad; 269 } 270 271 if (fd >= nfiles || p->p_fd->fd_ofiles[fd] == NULL) { 272 error = EBADF; 273 goto bad; 274 } 275 276 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp); 277 if (error) 278 goto bad; 279 VTOFDESC(fvp)->fd_fd = fd; 280 *vpp = fvp; 281 return (0); 282 } 283 284 bad:; 285 *vpp = NULL; 286 return (error); 287 } 288 289 int 290 fdesc_open(ap) 291 struct vop_open_args /* { 292 struct vnode *a_vp; 293 int a_mode; 294 struct ucred *a_cred; 295 struct proc *a_p; 296 } */ *ap; 297 { 298 struct vnode *vp = ap->a_vp; 299 300 switch (VTOFDESC(vp)->fd_type) { 301 case Fdesc: 302 /* 303 * XXX Kludge: set p->p_dupfd to contain the value of the 304 * the file descriptor being sought for duplication. The error 305 * return ensures that the vnode for this device will be 306 * released by vn_open. Open will detect this special error and 307 * take the actions in dupfdopen. Other callers of vn_open or 308 * VOP_OPEN will simply report the error. 309 */ 310 ap->a_p->p_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */ 311 return (ENODEV); 312 313 case Fctty: 314 return (cttyopen(devctty, ap->a_mode, 0, ap->a_p)); 315 } 316 317 return (0); 318 } 319 320 static int 321 fdesc_attr(fd, vap, cred, p) 322 int fd; 323 struct vattr *vap; 324 struct ucred *cred; 325 struct proc *p; 326 { 327 struct filedesc *fdp = p->p_fd; 328 struct file *fp; 329 struct stat stb; 330 int error; 331 332 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL) 333 return (EBADF); 334 335 switch (fp->f_type) { 336 case DTYPE_VNODE: 337 error = VOP_GETATTR((struct vnode *) fp->f_data, vap, cred, p); 338 if (error == 0 && vap->va_type == VDIR) { 339 /* 340 * directories can cause loops in the namespace, 341 * so turn off the 'x' bits to avoid trouble. 342 */ 343 vap->va_mode &= ~((VEXEC)|(VEXEC>>3)|(VEXEC>>6)); 344 } 345 break; 346 347 case DTYPE_SOCKET: 348 error = soo_stat((struct socket *)fp->f_data, &stb); 349 if (error == 0) { 350 vattr_null(vap); 351 vap->va_type = VSOCK; 352 vap->va_mode = stb.st_mode; 353 vap->va_nlink = stb.st_nlink; 354 vap->va_uid = stb.st_uid; 355 vap->va_gid = stb.st_gid; 356 vap->va_fsid = stb.st_dev; 357 vap->va_fileid = stb.st_ino; 358 vap->va_size = stb.st_size; 359 vap->va_blocksize = stb.st_blksize; 360 vap->va_atime = stb.st_atimespec; 361 vap->va_mtime = stb.st_mtimespec; 362 vap->va_ctime = stb.st_ctimespec; 363 vap->va_gen = stb.st_gen; 364 vap->va_flags = stb.st_flags; 365 vap->va_rdev = stb.st_rdev; 366 vap->va_bytes = stb.st_blocks * stb.st_blksize; 367 } 368 break; 369 370 default: 371 panic("fdesc attr"); 372 break; 373 } 374 375 return (error); 376 } 377 378 int 379 fdesc_getattr(ap) 380 struct vop_getattr_args /* { 381 struct vnode *a_vp; 382 struct vattr *a_vap; 383 struct ucred *a_cred; 384 struct proc *a_p; 385 } */ *ap; 386 { 387 struct vnode *vp = ap->a_vp; 388 struct vattr *vap = ap->a_vap; 389 unsigned fd; 390 int error = 0; 391 392 switch (VTOFDESC(vp)->fd_type) { 393 case Froot: 394 case Fdevfd: 395 case Flink: 396 case Fctty: 397 bzero((caddr_t) vap, sizeof(*vap)); 398 vattr_null(vap); 399 vap->va_fileid = VTOFDESC(vp)->fd_ix; 400 401 switch (VTOFDESC(vp)->fd_type) { 402 case Flink: 403 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 404 vap->va_type = VLNK; 405 vap->va_nlink = 1; 406 vap->va_size = strlen(VTOFDESC(vp)->fd_link); 407 break; 408 409 case Fctty: 410 vap->va_mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH; 411 vap->va_type = VFIFO; 412 vap->va_nlink = 1; 413 vap->va_size = 0; 414 break; 415 416 default: 417 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 418 vap->va_type = VDIR; 419 vap->va_nlink = 2; 420 vap->va_size = DEV_BSIZE; 421 break; 422 } 423 vap->va_uid = 0; 424 vap->va_gid = 0; 425 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 426 vap->va_blocksize = DEV_BSIZE; 427 vap->va_atime.tv_sec = boottime.tv_sec; 428 vap->va_atime.tv_nsec = 0; 429 vap->va_mtime = vap->va_atime; 430 vap->va_ctime = vap->va_mtime; 431 vap->va_gen = 0; 432 vap->va_flags = 0; 433 vap->va_rdev = 0; 434 vap->va_bytes = 0; 435 break; 436 437 case Fdesc: 438 fd = VTOFDESC(vp)->fd_fd; 439 error = fdesc_attr(fd, vap, ap->a_cred, ap->a_p); 440 break; 441 442 default: 443 panic("fdesc_getattr"); 444 break; 445 } 446 447 if (error == 0) 448 vp->v_type = vap->va_type; 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 filedesc *fdp = ap->a_p->p_fd; 463 struct file *fp; 464 unsigned fd; 465 int error; 466 467 /* 468 * Can't mess with the root vnode 469 */ 470 switch (VTOFDESC(ap->a_vp)->fd_type) { 471 case Fdesc: 472 break; 473 474 case Fctty: 475 return (0); 476 477 default: 478 return (EACCES); 479 } 480 481 fd = VTOFDESC(ap->a_vp)->fd_fd; 482 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL) { 483 return (EBADF); 484 } 485 486 /* 487 * Can setattr the underlying vnode, but not sockets! 488 */ 489 switch (fp->f_type) { 490 case DTYPE_VNODE: 491 error = VOP_SETATTR((struct vnode *) fp->f_data, ap->a_vap, ap->a_cred, ap->a_p); 492 break; 493 494 case DTYPE_SOCKET: 495 error = 0; 496 break; 497 498 default: 499 panic("fdesc setattr"); 500 break; 501 } 502 503 return (error); 504 } 505 506 #define UIO_MX 32 507 508 struct fdesc_target { 509 ino_t ft_fileno; 510 u_char ft_type; 511 u_char ft_namlen; 512 char *ft_name; 513 } fdesc_targets[] = { 514 /* NOTE: The name must be less than UIO_MX-16 chars in length */ 515 #define N(s) sizeof(s)-1, s 516 { FD_DEVFD, DT_DIR, N("fd") }, 517 { FD_STDIN, DT_LNK, N("stdin") }, 518 { FD_STDOUT, DT_LNK, N("stdout") }, 519 { FD_STDERR, DT_LNK, N("stderr") }, 520 { FD_CTTY, DT_UNKNOWN, N("tty") }, 521 #undef N 522 }; 523 static int nfdesc_targets = sizeof(fdesc_targets) / sizeof(fdesc_targets[0]); 524 525 int 526 fdesc_readdir(ap) 527 struct vop_readdir_args /* { 528 struct vnode *a_vp; 529 struct uio *a_uio; 530 struct ucred *a_cred; 531 int *a_eofflag; 532 u_long *a_cookies; 533 int a_ncookies; 534 } */ *ap; 535 { 536 struct uio *uio = ap->a_uio; 537 struct dirent d; 538 struct filedesc *fdp; 539 int i; 540 int error; 541 u_long *cookies = ap->a_cookies; 542 int ncookies = ap->a_ncookies; 543 544 switch (VTOFDESC(ap->a_vp)->fd_type) { 545 case Fctty: 546 return (0); 547 548 case Fdesc: 549 return (ENOTDIR); 550 } 551 552 fdp = uio->uio_procp->p_fd; 553 554 if (uio->uio_resid < UIO_MX) 555 return (EINVAL); 556 if (uio->uio_offset < 0) 557 return (EINVAL); 558 559 error = 0; 560 i = uio->uio_offset; 561 bzero((caddr_t)&d, UIO_MX); 562 d.d_reclen = UIO_MX; 563 564 if (VTOFDESC(ap->a_vp)->fd_type == Froot) { 565 struct fdesc_target *ft; 566 567 for (ft = &fdesc_targets[i]; 568 uio->uio_resid >= UIO_MX && i < nfdesc_targets; ft++, i++) { 569 switch (ft->ft_fileno) { 570 case FD_CTTY: 571 if (cttyvp(uio->uio_procp) == NULL) 572 continue; 573 break; 574 575 case FD_STDIN: 576 case FD_STDOUT: 577 case FD_STDERR: 578 if ((ft->ft_fileno - FD_STDIN) >= fdp->fd_nfiles) 579 continue; 580 if (fdp->fd_ofiles[ft->ft_fileno - FD_STDIN] == NULL) 581 continue; 582 break; 583 } 584 585 d.d_fileno = ft->ft_fileno; 586 d.d_namlen = ft->ft_namlen; 587 bcopy(ft->ft_name, d.d_name, ft->ft_namlen + 1); 588 d.d_type = ft->ft_type; 589 590 if (error = uiomove((caddr_t)&d, UIO_MX, uio)) 591 break; 592 if (ncookies-- > 0) 593 *cookies++ = i + 1; 594 } 595 } else { 596 for (; i - 2 < fdp->fd_nfiles && uio->uio_resid >= UIO_MX; 597 i++) { 598 switch (i) { 599 case 0: 600 case 1: 601 d.d_fileno = FD_ROOT; /* XXX */ 602 d.d_namlen = i + 1; 603 bcopy("..", d.d_name, d.d_namlen); 604 d.d_name[i + 1] = '\0'; 605 d.d_type = DT_DIR; 606 break; 607 608 default: 609 if (fdp->fd_ofiles[i - 2] == NULL) 610 continue; 611 d.d_fileno = i - 2 + FD_STDIN; 612 d.d_namlen = sprintf(d.d_name, "%d", i - 2); 613 d.d_type = DT_UNKNOWN; 614 break; 615 } 616 617 if (error = uiomove((caddr_t)&d, UIO_MX, uio)) 618 break; 619 if (ncookies-- > 0) 620 *cookies++ = i + 1; 621 } 622 } 623 624 uio->uio_offset = i; 625 return (error); 626 } 627 628 int 629 fdesc_readlink(ap) 630 struct vop_readlink_args /* { 631 struct vnode *a_vp; 632 struct uio *a_uio; 633 struct ucred *a_cred; 634 } */ *ap; 635 { 636 struct vnode *vp = ap->a_vp; 637 int error; 638 639 if (vp->v_type != VLNK) 640 return (EPERM); 641 642 if (VTOFDESC(vp)->fd_type == Flink) { 643 char *ln = VTOFDESC(vp)->fd_link; 644 error = uiomove(ln, strlen(ln), ap->a_uio); 645 } else { 646 error = EOPNOTSUPP; 647 } 648 649 return (error); 650 } 651 652 int 653 fdesc_read(ap) 654 struct vop_read_args /* { 655 struct vnode *a_vp; 656 struct uio *a_uio; 657 int a_ioflag; 658 struct ucred *a_cred; 659 } */ *ap; 660 { 661 int error = EOPNOTSUPP; 662 663 switch (VTOFDESC(ap->a_vp)->fd_type) { 664 case Fctty: 665 error = cttyread(devctty, ap->a_uio, ap->a_ioflag); 666 break; 667 668 default: 669 error = EOPNOTSUPP; 670 break; 671 } 672 673 return (error); 674 } 675 676 int 677 fdesc_write(ap) 678 struct vop_write_args /* { 679 struct vnode *a_vp; 680 struct uio *a_uio; 681 int a_ioflag; 682 struct ucred *a_cred; 683 } */ *ap; 684 { 685 int error = EOPNOTSUPP; 686 687 switch (VTOFDESC(ap->a_vp)->fd_type) { 688 case Fctty: 689 error = cttywrite(devctty, ap->a_uio, ap->a_ioflag); 690 break; 691 692 default: 693 error = EOPNOTSUPP; 694 break; 695 } 696 697 return (error); 698 } 699 700 int 701 fdesc_ioctl(ap) 702 struct vop_ioctl_args /* { 703 struct vnode *a_vp; 704 u_long a_command; 705 caddr_t a_data; 706 int a_fflag; 707 struct ucred *a_cred; 708 struct proc *a_p; 709 } */ *ap; 710 { 711 int error = EOPNOTSUPP; 712 713 switch (VTOFDESC(ap->a_vp)->fd_type) { 714 case Fctty: 715 error = cttyioctl(devctty, ap->a_command, ap->a_data, 716 ap->a_fflag, ap->a_p); 717 break; 718 719 default: 720 error = EOPNOTSUPP; 721 break; 722 } 723 724 return (error); 725 } 726 727 int 728 fdesc_select(ap) 729 struct vop_select_args /* { 730 struct vnode *a_vp; 731 int a_which; 732 int a_fflags; 733 struct ucred *a_cred; 734 struct proc *a_p; 735 } */ *ap; 736 { 737 int error = EOPNOTSUPP; 738 739 switch (VTOFDESC(ap->a_vp)->fd_type) { 740 case Fctty: 741 error = cttyselect(devctty, ap->a_fflags, ap->a_p); 742 break; 743 744 default: 745 error = EOPNOTSUPP; 746 break; 747 } 748 749 return (error); 750 } 751 752 int 753 fdesc_inactive(ap) 754 struct vop_inactive_args /* { 755 struct vnode *a_vp; 756 } */ *ap; 757 { 758 struct vnode *vp = ap->a_vp; 759 760 /* 761 * Clear out the v_type field to avoid 762 * nasty things happening in vgone(). 763 */ 764 vp->v_type = VNON; 765 return (0); 766 } 767 768 int 769 fdesc_reclaim(ap) 770 struct vop_reclaim_args /* { 771 struct vnode *a_vp; 772 } */ *ap; 773 { 774 struct vnode *vp = ap->a_vp; 775 struct fdescnode *fd = VTOFDESC(vp); 776 777 LIST_REMOVE(fd, fd_hash); 778 FREE(vp->v_data, M_TEMP); 779 vp->v_data = 0; 780 781 return (0); 782 } 783 784 /* 785 * Return POSIX pathconf information applicable to special devices. 786 */ 787 fdesc_pathconf(ap) 788 struct vop_pathconf_args /* { 789 struct vnode *a_vp; 790 int a_name; 791 register_t *a_retval; 792 } */ *ap; 793 { 794 795 switch (ap->a_name) { 796 case _PC_LINK_MAX: 797 *ap->a_retval = LINK_MAX; 798 return (0); 799 case _PC_MAX_CANON: 800 *ap->a_retval = MAX_CANON; 801 return (0); 802 case _PC_MAX_INPUT: 803 *ap->a_retval = MAX_INPUT; 804 return (0); 805 case _PC_PIPE_BUF: 806 *ap->a_retval = PIPE_BUF; 807 return (0); 808 case _PC_CHOWN_RESTRICTED: 809 *ap->a_retval = 1; 810 return (0); 811 case _PC_VDISABLE: 812 *ap->a_retval = _POSIX_VDISABLE; 813 return (0); 814 default: 815 return (EINVAL); 816 } 817 /* NOTREACHED */ 818 } 819 820 /* 821 * Print out the contents of a /dev/fd vnode. 822 */ 823 /* ARGSUSED */ 824 int 825 fdesc_print(ap) 826 struct vop_print_args /* { 827 struct vnode *a_vp; 828 } */ *ap; 829 { 830 831 printf("tag VT_NON, fdesc vnode\n"); 832 return (0); 833 } 834 835 /*void*/ 836 int 837 fdesc_vfree(ap) 838 struct vop_vfree_args /* { 839 struct vnode *a_pvp; 840 ino_t a_ino; 841 int a_mode; 842 } */ *ap; 843 { 844 845 return (0); 846 } 847 848 int 849 fdesc_link(ap) 850 struct vop_link_args /* { 851 struct vnode *a_dvp; 852 struct vnode *a_vp; 853 struct componentname *a_cnp; 854 } */ *ap; 855 { 856 857 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 858 vput(ap->a_dvp); 859 return (EROFS); 860 } 861 862 int 863 fdesc_symlink(ap) 864 struct vop_symlink_args /* { 865 struct vnode *a_dvp; 866 struct vnode **a_vpp; 867 struct componentname *a_cnp; 868 struct vattr *a_vap; 869 char *a_target; 870 } */ *ap; 871 { 872 873 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 874 vput(ap->a_dvp); 875 return (EROFS); 876 } 877 878 int 879 fdesc_abortop(ap) 880 struct vop_abortop_args /* { 881 struct vnode *a_dvp; 882 struct componentname *a_cnp; 883 } */ *ap; 884 { 885 886 if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF) 887 FREE(ap->a_cnp->cn_pnbuf, M_NAMEI); 888 return (0); 889 } 890 891 /* 892 * /dev/fd vnode unsupported operation 893 */ 894 int 895 fdesc_enotsupp() 896 { 897 898 return (EOPNOTSUPP); 899 } 900 901 /* 902 * /dev/fd "should never get here" operation 903 */ 904 int 905 fdesc_badop() 906 { 907 908 panic("fdesc: bad op"); 909 /* NOTREACHED */ 910 } 911 912 /* 913 * /dev/fd vnode null operation 914 */ 915 int 916 fdesc_nullop() 917 { 918 919 return (0); 920 } 921 922 #define fdesc_create ((int (*) __P((struct vop_create_args *)))fdesc_enotsupp) 923 #define fdesc_mknod ((int (*) __P((struct vop_mknod_args *)))fdesc_enotsupp) 924 #define fdesc_close ((int (*) __P((struct vop_close_args *)))nullop) 925 #define fdesc_access ((int (*) __P((struct vop_access_args *)))nullop) 926 #define fdesc_mmap ((int (*) __P((struct vop_mmap_args *)))fdesc_enotsupp) 927 #define fdesc_fsync ((int (*) __P((struct vop_fsync_args *)))nullop) 928 #define fdesc_seek ((int (*) __P((struct vop_seek_args *)))nullop) 929 #define fdesc_remove ((int (*) __P((struct vop_remove_args *)))fdesc_enotsupp) 930 #define fdesc_rename ((int (*) __P((struct vop_rename_args *)))fdesc_enotsupp) 931 #define fdesc_mkdir ((int (*) __P((struct vop_mkdir_args *)))fdesc_enotsupp) 932 #define fdesc_rmdir ((int (*) __P((struct vop_rmdir_args *)))fdesc_enotsupp) 933 #define fdesc_lock ((int (*) __P((struct vop_lock_args *)))nullop) 934 #define fdesc_unlock ((int (*) __P((struct vop_unlock_args *)))nullop) 935 #define fdesc_bmap ((int (*) __P((struct vop_bmap_args *)))fdesc_badop) 936 #define fdesc_strategy ((int (*) __P((struct vop_strategy_args *)))fdesc_badop) 937 #define fdesc_islocked ((int (*) __P((struct vop_islocked_args *)))nullop) 938 #define fdesc_advlock ((int (*) __P((struct vop_advlock_args *)))fdesc_enotsupp) 939 #define fdesc_blkatoff \ 940 ((int (*) __P((struct vop_blkatoff_args *)))fdesc_enotsupp) 941 #define fdesc_vget ((int (*) __P((struct vop_vget_args *)))fdesc_enotsupp) 942 #define fdesc_valloc ((int(*) __P(( \ 943 struct vnode *pvp, \ 944 int mode, \ 945 struct ucred *cred, \ 946 struct vnode **vpp))) fdesc_enotsupp) 947 #define fdesc_truncate \ 948 ((int (*) __P((struct vop_truncate_args *)))fdesc_enotsupp) 949 #define fdesc_update ((int (*) __P((struct vop_update_args *)))fdesc_enotsupp) 950 #define fdesc_bwrite ((int (*) __P((struct vop_bwrite_args *)))fdesc_enotsupp) 951 952 int (**fdesc_vnodeop_p)(); 953 struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = { 954 { &vop_default_desc, vn_default_error }, 955 { &vop_lookup_desc, fdesc_lookup }, /* lookup */ 956 { &vop_create_desc, fdesc_create }, /* create */ 957 { &vop_mknod_desc, fdesc_mknod }, /* mknod */ 958 { &vop_open_desc, fdesc_open }, /* open */ 959 { &vop_close_desc, fdesc_close }, /* close */ 960 { &vop_access_desc, fdesc_access }, /* access */ 961 { &vop_getattr_desc, fdesc_getattr }, /* getattr */ 962 { &vop_setattr_desc, fdesc_setattr }, /* setattr */ 963 { &vop_read_desc, fdesc_read }, /* read */ 964 { &vop_write_desc, fdesc_write }, /* write */ 965 { &vop_ioctl_desc, fdesc_ioctl }, /* ioctl */ 966 { &vop_select_desc, fdesc_select }, /* select */ 967 { &vop_mmap_desc, fdesc_mmap }, /* mmap */ 968 { &vop_fsync_desc, fdesc_fsync }, /* fsync */ 969 { &vop_seek_desc, fdesc_seek }, /* seek */ 970 { &vop_remove_desc, fdesc_remove }, /* remove */ 971 { &vop_link_desc, fdesc_link }, /* link */ 972 { &vop_rename_desc, fdesc_rename }, /* rename */ 973 { &vop_mkdir_desc, fdesc_mkdir }, /* mkdir */ 974 { &vop_rmdir_desc, fdesc_rmdir }, /* rmdir */ 975 { &vop_symlink_desc, fdesc_symlink }, /* symlink */ 976 { &vop_readdir_desc, fdesc_readdir }, /* readdir */ 977 { &vop_readlink_desc, fdesc_readlink }, /* readlink */ 978 { &vop_abortop_desc, fdesc_abortop }, /* abortop */ 979 { &vop_inactive_desc, fdesc_inactive }, /* inactive */ 980 { &vop_reclaim_desc, fdesc_reclaim }, /* reclaim */ 981 { &vop_lock_desc, fdesc_lock }, /* lock */ 982 { &vop_unlock_desc, fdesc_unlock }, /* unlock */ 983 { &vop_bmap_desc, fdesc_bmap }, /* bmap */ 984 { &vop_strategy_desc, fdesc_strategy }, /* strategy */ 985 { &vop_print_desc, fdesc_print }, /* print */ 986 { &vop_islocked_desc, fdesc_islocked }, /* islocked */ 987 { &vop_pathconf_desc, fdesc_pathconf }, /* pathconf */ 988 { &vop_advlock_desc, fdesc_advlock }, /* advlock */ 989 { &vop_blkatoff_desc, fdesc_blkatoff }, /* blkatoff */ 990 { &vop_valloc_desc, fdesc_valloc }, /* valloc */ 991 { &vop_vfree_desc, fdesc_vfree }, /* vfree */ 992 { &vop_truncate_desc, fdesc_truncate }, /* truncate */ 993 { &vop_update_desc, fdesc_update }, /* update */ 994 { &vop_bwrite_desc, fdesc_bwrite }, /* bwrite */ 995 { (struct vnodeop_desc*)NULL, (int(*)())NULL } 996 }; 997 struct vnodeopv_desc fdesc_vnodeop_opv_desc = 998 { &fdesc_vnodeop_p, fdesc_vnodeop_entries }; 999
Indexes created Wed Oct 22 06:10:02 GMT 2025