fdesc_vnops.c revision 1.130.4.1
1 /* $NetBSD: fdesc_vnops.c,v 1.130.4.1 2021/05/03 09:03:22 martin 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)fdesc_vnops.c 8.17 (Berkeley) 5/22/95 35 * 36 * #Id: fdesc_vnops.c,v 1.12 1993/04/06 16:17:17 jsp Exp # 37 */ 38 39 /* 40 * /dev/fd Filesystem 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: fdesc_vnops.c,v 1.130.4.1 2021/05/03 09:03:22 martin Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/time.h> 49 #include <sys/proc.h> 50 #include <sys/kernel.h> /* boottime */ 51 #include <sys/resourcevar.h> 52 #include <sys/socketvar.h> 53 #include <sys/filedesc.h> 54 #include <sys/vnode.h> 55 #include <sys/malloc.h> 56 #include <sys/conf.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 <sys/tty.h> 64 #include <sys/kauth.h> 65 #include <sys/atomic.h> 66 67 #include <miscfs/fdesc/fdesc.h> 68 #include <miscfs/genfs/genfs.h> 69 70 #define cttyvp(p) ((p)->p_lflag & PL_CONTROLT ? (p)->p_session->s_ttyvp : NULL) 71 72 dev_t devctty; 73 74 #if (FD_STDIN != FD_STDOUT-1) || (FD_STDOUT != FD_STDERR-1) 75 FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n+1, n+2 76 #endif 77 78 int fdesc_lookup(void *); 79 #define fdesc_create genfs_eopnotsupp 80 #define fdesc_mknod genfs_eopnotsupp 81 int fdesc_open(void *); 82 #define fdesc_close genfs_nullop 83 #define fdesc_access genfs_nullop 84 int fdesc_getattr(void *); 85 int fdesc_setattr(void *); 86 int fdesc_read(void *); 87 int fdesc_write(void *); 88 int fdesc_ioctl(void *); 89 int fdesc_poll(void *); 90 int fdesc_kqfilter(void *); 91 #define fdesc_mmap genfs_eopnotsupp 92 #define fdesc_fcntl genfs_fcntl 93 #define fdesc_fsync genfs_nullop 94 #define fdesc_seek genfs_seek 95 #define fdesc_remove genfs_eopnotsupp 96 int fdesc_link(void *); 97 #define fdesc_rename genfs_eopnotsupp 98 #define fdesc_mkdir genfs_eopnotsupp 99 #define fdesc_rmdir genfs_eopnotsupp 100 int fdesc_symlink(void *); 101 int fdesc_readdir(void *); 102 int fdesc_readlink(void *); 103 #define fdesc_abortop genfs_abortop 104 int fdesc_inactive(void *); 105 int fdesc_reclaim(void *); 106 #define fdesc_lock genfs_lock 107 #define fdesc_unlock genfs_unlock 108 #define fdesc_bmap genfs_badop 109 #define fdesc_strategy genfs_badop 110 int fdesc_print(void *); 111 int fdesc_pathconf(void *); 112 #define fdesc_islocked genfs_islocked 113 #define fdesc_advlock genfs_einval 114 #define fdesc_bwrite genfs_eopnotsupp 115 #define fdesc_revoke genfs_revoke 116 #define fdesc_putpages genfs_null_putpages 117 118 static int fdesc_attr(int, struct vattr *, kauth_cred_t); 119 120 int (**fdesc_vnodeop_p)(void *); 121 const struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = { 122 { &vop_default_desc, vn_default_error }, 123 { &vop_lookup_desc, fdesc_lookup }, /* lookup */ 124 { &vop_create_desc, fdesc_create }, /* create */ 125 { &vop_mknod_desc, fdesc_mknod }, /* mknod */ 126 { &vop_open_desc, fdesc_open }, /* open */ 127 { &vop_close_desc, fdesc_close }, /* close */ 128 { &vop_access_desc, fdesc_access }, /* access */ 129 { &vop_getattr_desc, fdesc_getattr }, /* getattr */ 130 { &vop_setattr_desc, fdesc_setattr }, /* setattr */ 131 { &vop_read_desc, fdesc_read }, /* read */ 132 { &vop_write_desc, fdesc_write }, /* write */ 133 { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ 134 { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ 135 { &vop_ioctl_desc, fdesc_ioctl }, /* ioctl */ 136 { &vop_fcntl_desc, fdesc_fcntl }, /* fcntl */ 137 { &vop_poll_desc, fdesc_poll }, /* poll */ 138 { &vop_kqfilter_desc, fdesc_kqfilter }, /* kqfilter */ 139 { &vop_revoke_desc, fdesc_revoke }, /* revoke */ 140 { &vop_mmap_desc, fdesc_mmap }, /* mmap */ 141 { &vop_fsync_desc, fdesc_fsync }, /* fsync */ 142 { &vop_seek_desc, fdesc_seek }, /* seek */ 143 { &vop_remove_desc, fdesc_remove }, /* remove */ 144 { &vop_link_desc, fdesc_link }, /* link */ 145 { &vop_rename_desc, fdesc_rename }, /* rename */ 146 { &vop_mkdir_desc, fdesc_mkdir }, /* mkdir */ 147 { &vop_rmdir_desc, fdesc_rmdir }, /* rmdir */ 148 { &vop_symlink_desc, fdesc_symlink }, /* symlink */ 149 { &vop_readdir_desc, fdesc_readdir }, /* readdir */ 150 { &vop_readlink_desc, fdesc_readlink }, /* readlink */ 151 { &vop_abortop_desc, fdesc_abortop }, /* abortop */ 152 { &vop_inactive_desc, fdesc_inactive }, /* inactive */ 153 { &vop_reclaim_desc, fdesc_reclaim }, /* reclaim */ 154 { &vop_lock_desc, fdesc_lock }, /* lock */ 155 { &vop_unlock_desc, fdesc_unlock }, /* unlock */ 156 { &vop_bmap_desc, fdesc_bmap }, /* bmap */ 157 { &vop_strategy_desc, fdesc_strategy }, /* strategy */ 158 { &vop_print_desc, fdesc_print }, /* print */ 159 { &vop_islocked_desc, fdesc_islocked }, /* islocked */ 160 { &vop_pathconf_desc, fdesc_pathconf }, /* pathconf */ 161 { &vop_advlock_desc, fdesc_advlock }, /* advlock */ 162 { &vop_bwrite_desc, fdesc_bwrite }, /* bwrite */ 163 { &vop_putpages_desc, fdesc_putpages }, /* putpages */ 164 { NULL, NULL } 165 }; 166 167 const struct vnodeopv_desc fdesc_vnodeop_opv_desc = 168 { &fdesc_vnodeop_p, fdesc_vnodeop_entries }; 169 170 /* 171 * Initialise cache headers 172 */ 173 void 174 fdesc_init(void) 175 { 176 int cttymajor; 177 178 /* locate the major number */ 179 cttymajor = devsw_name2chr("ctty", NULL, 0); 180 devctty = makedev(cttymajor, 0); 181 } 182 183 void 184 fdesc_done(void) 185 { 186 } 187 188 /* 189 * vp is the current namei directory 190 * ndp is the name to locate in that directory... 191 */ 192 int 193 fdesc_lookup(void *v) 194 { 195 struct vop_lookup_v2_args /* { 196 struct vnode * a_dvp; 197 struct vnode ** a_vpp; 198 struct componentname * a_cnp; 199 } */ *ap = v; 200 struct vnode **vpp = ap->a_vpp; 201 struct vnode *dvp = ap->a_dvp; 202 struct componentname *cnp = ap->a_cnp; 203 struct lwp *l = curlwp; 204 const char *pname = cnp->cn_nameptr; 205 struct proc *p = l->l_proc; 206 unsigned fd = 0; 207 int error, ix = -1; 208 fdtab_t *dt; 209 210 dt = curlwp->l_fd->fd_dt; 211 212 if (cnp->cn_namelen == 1 && *pname == '.') { 213 *vpp = dvp; 214 vref(dvp); 215 return (0); 216 } 217 218 switch (VTOFDESC(dvp)->fd_type) { 219 default: 220 case Flink: 221 case Fdesc: 222 case Fctty: 223 error = ENOTDIR; 224 goto bad; 225 226 case Froot: 227 if (cnp->cn_namelen == 2 && memcmp(pname, "fd", 2) == 0) { 228 ix = FD_DEVFD; 229 goto good; 230 } 231 232 if (cnp->cn_namelen == 3 && memcmp(pname, "tty", 3) == 0) { 233 struct vnode *ttyvp = cttyvp(p); 234 if (ttyvp == NULL) { 235 error = ENXIO; 236 goto bad; 237 } 238 ix = FD_CTTY; 239 goto good; 240 } 241 242 switch (cnp->cn_namelen) { 243 case 5: 244 if (memcmp(pname, "stdin", 5) == 0) { 245 ix = FD_STDIN; 246 goto good; 247 } 248 break; 249 case 6: 250 if (memcmp(pname, "stdout", 6) == 0) { 251 ix = FD_STDOUT; 252 goto good; 253 } else if (memcmp(pname, "stderr", 6) == 0) { 254 ix = FD_STDERR; 255 goto good; 256 } 257 break; 258 } 259 260 error = ENOENT; 261 goto bad; 262 263 case Fdevfd: 264 if (cnp->cn_namelen == 2 && memcmp(pname, "..", 2) == 0) { 265 ix = FD_ROOT; 266 goto good; 267 } 268 269 fd = 0; 270 while (*pname >= '0' && *pname <= '9') { 271 fd = 10 * fd + *pname++ - '0'; 272 if (fd >= dt->dt_nfiles) 273 break; 274 } 275 276 if (*pname != '\0') { 277 error = ENOENT; 278 goto bad; 279 } 280 281 if (fd >= dt->dt_nfiles || dt->dt_ff[fd] == NULL || 282 dt->dt_ff[fd]->ff_file == NULL) { 283 error = EBADF; 284 goto bad; 285 } 286 287 ix = FD_DESC + fd; 288 goto good; 289 } 290 291 bad: 292 *vpp = NULL; 293 return error; 294 295 good: 296 KASSERT(ix != -1); 297 error = vcache_get(dvp->v_mount, &ix, sizeof(ix), vpp); 298 if (error) 299 return error; 300 301 /* 302 * Prevent returning VNON nodes. 303 * Operation fdesc_inactive() will reset the type to VNON. 304 */ 305 if (ix == FD_CTTY) 306 (*vpp)->v_type = VCHR; 307 else if (ix >= FD_DESC) 308 (*vpp)->v_type = VREG; 309 KASSERT((*vpp)->v_type != VNON); 310 311 return 0; 312 } 313 314 int 315 fdesc_open(void *v) 316 { 317 struct vop_open_args /* { 318 struct vnode *a_vp; 319 int a_mode; 320 kauth_cred_t a_cred; 321 } */ *ap = v; 322 struct vnode *vp = ap->a_vp; 323 324 switch (VTOFDESC(vp)->fd_type) { 325 case Fdesc: 326 /* 327 * XXX Kludge: set dupfd to contain the value of the 328 * the file descriptor being sought for duplication. The error 329 * return ensures that the vnode for this device will be 330 * released by vn_open. Open will detect this special error and 331 * take the actions in dupfdopen. Other callers of vn_open or 332 * VOP_OPEN will simply report the error. 333 */ 334 curlwp->l_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */ 335 return EDUPFD; 336 337 case Fctty: 338 return cdev_open(devctty, ap->a_mode, 0, curlwp); 339 case Froot: 340 case Fdevfd: 341 case Flink: 342 break; 343 } 344 345 return (0); 346 } 347 348 static int 349 fdesc_attr(int fd, struct vattr *vap, kauth_cred_t cred) 350 { 351 file_t *fp; 352 struct stat stb; 353 int error; 354 355 if ((fp = fd_getfile(fd)) == NULL) 356 return (EBADF); 357 358 switch (fp->f_type) { 359 case DTYPE_VNODE: 360 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 361 error = VOP_GETATTR(fp->f_vnode, vap, cred); 362 VOP_UNLOCK(fp->f_vnode); 363 if (error == 0 && vap->va_type == VDIR) { 364 /* 365 * directories can cause loops in the namespace, 366 * so turn off the 'x' bits to avoid trouble. 367 */ 368 vap->va_mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH); 369 } 370 break; 371 372 default: 373 memset(&stb, 0, sizeof(stb)); 374 error = (*fp->f_ops->fo_stat)(fp, &stb); 375 if (error) 376 break; 377 378 vattr_null(vap); 379 switch(fp->f_type) { 380 case DTYPE_SOCKET: 381 vap->va_type = VSOCK; 382 break; 383 case DTYPE_PIPE: 384 vap->va_type = VFIFO; 385 break; 386 default: 387 /* use VNON perhaps? */ 388 vap->va_type = VBAD; 389 break; 390 } 391 vap->va_mode = stb.st_mode; 392 vap->va_nlink = stb.st_nlink; 393 vap->va_uid = stb.st_uid; 394 vap->va_gid = stb.st_gid; 395 vap->va_fsid = stb.st_dev; 396 vap->va_fileid = stb.st_ino; 397 vap->va_size = stb.st_size; 398 vap->va_blocksize = stb.st_blksize; 399 vap->va_atime = stb.st_atimespec; 400 vap->va_mtime = stb.st_mtimespec; 401 vap->va_ctime = stb.st_ctimespec; 402 vap->va_gen = stb.st_gen; 403 vap->va_flags = stb.st_flags; 404 vap->va_rdev = stb.st_rdev; 405 vap->va_bytes = stb.st_blocks * stb.st_blksize; 406 break; 407 } 408 409 fd_putfile(fd); 410 return (error); 411 } 412 413 int 414 fdesc_getattr(void *v) 415 { 416 struct vop_getattr_args /* { 417 struct vnode *a_vp; 418 struct vattr *a_vap; 419 kauth_cred_t a_cred; 420 struct lwp *a_l; 421 } */ *ap = v; 422 struct vnode *vp = ap->a_vp; 423 struct vattr *vap = ap->a_vap; 424 unsigned fd; 425 int error = 0; 426 427 switch (VTOFDESC(vp)->fd_type) { 428 case Froot: 429 case Fdevfd: 430 case Flink: 431 case Fctty: 432 vattr_null(vap); 433 vap->va_fileid = VTOFDESC(vp)->fd_ix; 434 435 #define R_ALL (S_IRUSR|S_IRGRP|S_IROTH) 436 #define W_ALL (S_IWUSR|S_IWGRP|S_IWOTH) 437 #define X_ALL (S_IXUSR|S_IXGRP|S_IXOTH) 438 439 switch (VTOFDESC(vp)->fd_type) { 440 case Flink: 441 vap->va_mode = R_ALL|X_ALL; 442 vap->va_type = VLNK; 443 vap->va_rdev = 0; 444 vap->va_nlink = 1; 445 vap->va_size = strlen(VTOFDESC(vp)->fd_link); 446 break; 447 448 case Fctty: 449 vap->va_mode = R_ALL|W_ALL; 450 vap->va_type = VCHR; 451 vap->va_rdev = devctty; 452 vap->va_nlink = 1; 453 vap->va_size = 0; 454 break; 455 456 default: 457 vap->va_mode = R_ALL|X_ALL; 458 vap->va_type = VDIR; 459 vap->va_rdev = 0; 460 vap->va_nlink = 2; 461 vap->va_size = DEV_BSIZE; 462 break; 463 } 464 vap->va_uid = 0; 465 vap->va_gid = 0; 466 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 467 vap->va_blocksize = DEV_BSIZE; 468 vap->va_atime.tv_sec = boottime.tv_sec; 469 vap->va_atime.tv_nsec = 0; 470 vap->va_mtime = vap->va_atime; 471 vap->va_ctime = vap->va_mtime; 472 vap->va_gen = 0; 473 vap->va_flags = 0; 474 vap->va_bytes = 0; 475 break; 476 477 case Fdesc: 478 fd = VTOFDESC(vp)->fd_fd; 479 error = fdesc_attr(fd, vap, ap->a_cred); 480 break; 481 482 default: 483 panic("fdesc_getattr"); 484 break; 485 } 486 487 if (error == 0) 488 vp->v_type = vap->va_type; 489 490 return (error); 491 } 492 493 int 494 fdesc_setattr(void *v) 495 { 496 struct vop_setattr_args /* { 497 struct vnode *a_vp; 498 struct vattr *a_vap; 499 kauth_cred_t a_cred; 500 } */ *ap = v; 501 file_t *fp; 502 unsigned fd; 503 504 /* 505 * Can't mess with the root vnode 506 */ 507 switch (VTOFDESC(ap->a_vp)->fd_type) { 508 case Fdesc: 509 break; 510 511 case Fctty: 512 return (0); 513 514 default: 515 return (EACCES); 516 } 517 518 fd = VTOFDESC(ap->a_vp)->fd_fd; 519 if ((fp = fd_getfile(fd)) == NULL) 520 return (EBADF); 521 522 /* 523 * XXX: Can't reasonably set the attr's on any types currently. 524 * On vnode's this will cause truncation and socket/pipes make 525 * no sense. 526 */ 527 fd_putfile(fd); 528 return (0); 529 } 530 531 532 struct fdesc_target { 533 ino_t ft_fileno; 534 u_char ft_type; 535 u_char ft_namlen; 536 const char *ft_name; 537 } fdesc_targets[] = { 538 #define N(s) sizeof(s)-1, s 539 { FD_DEVFD, DT_DIR, N("fd") }, 540 { FD_STDIN, DT_LNK, N("stdin") }, 541 { FD_STDOUT, DT_LNK, N("stdout") }, 542 { FD_STDERR, DT_LNK, N("stderr") }, 543 { FD_CTTY, DT_UNKNOWN, N("tty") }, 544 #undef N 545 #define UIO_MX _DIRENT_RECLEN((struct dirent *)NULL, sizeof("stderr") - 1) 546 }; 547 static int nfdesc_targets = sizeof(fdesc_targets) / sizeof(fdesc_targets[0]); 548 549 int 550 fdesc_readdir(void *v) 551 { 552 struct vop_readdir_args /* { 553 struct vnode *a_vp; 554 struct uio *a_uio; 555 kauth_cred_t a_cred; 556 int *a_eofflag; 557 off_t **a_cookies; 558 int *a_ncookies; 559 } */ *ap = v; 560 struct uio *uio = ap->a_uio; 561 struct dirent d; 562 off_t i; 563 int j; 564 int error; 565 off_t *cookies = NULL; 566 int ncookies; 567 fdtab_t *dt; 568 569 switch (VTOFDESC(ap->a_vp)->fd_type) { 570 case Fctty: 571 return 0; 572 573 case Fdesc: 574 return ENOTDIR; 575 576 default: 577 break; 578 } 579 580 dt = curlwp->l_fd->fd_dt; 581 582 if (uio->uio_resid < UIO_MX) 583 return EINVAL; 584 if (uio->uio_offset < 0) 585 return EINVAL; 586 587 error = 0; 588 i = uio->uio_offset; 589 (void)memset(&d, 0, UIO_MX); 590 d.d_reclen = UIO_MX; 591 if (ap->a_ncookies) 592 ncookies = uio->uio_resid / UIO_MX; 593 else 594 ncookies = 0; 595 596 if (VTOFDESC(ap->a_vp)->fd_type == Froot) { 597 struct fdesc_target *ft; 598 599 if (i >= nfdesc_targets) 600 return 0; 601 602 if (ap->a_ncookies) { 603 ncookies = uimin(ncookies, (nfdesc_targets - i)); 604 cookies = malloc(ncookies * sizeof(off_t), 605 M_TEMP, M_WAITOK); 606 *ap->a_cookies = cookies; 607 *ap->a_ncookies = ncookies; 608 } 609 610 for (ft = &fdesc_targets[i]; uio->uio_resid >= UIO_MX && 611 i < nfdesc_targets; ft++, i++) { 612 switch (ft->ft_fileno) { 613 case FD_CTTY: 614 if (cttyvp(curproc) == NULL) 615 continue; 616 break; 617 618 case FD_STDIN: 619 case FD_STDOUT: 620 case FD_STDERR: 621 if ((ft->ft_fileno - FD_STDIN) >= 622 dt->dt_nfiles) 623 continue; 624 if (dt->dt_ff[ft->ft_fileno - FD_STDIN] 625 == NULL || dt->dt_ff[ft->ft_fileno - 626 FD_STDIN]->ff_file == NULL) 627 continue; 628 break; 629 } 630 631 d.d_fileno = ft->ft_fileno; 632 d.d_namlen = ft->ft_namlen; 633 (void)memcpy(d.d_name, ft->ft_name, ft->ft_namlen + 1); 634 d.d_type = ft->ft_type; 635 636 if ((error = uiomove(&d, UIO_MX, uio)) != 0) 637 break; 638 if (cookies) 639 *cookies++ = i + 1; 640 } 641 } else { 642 membar_consumer(); 643 if (ap->a_ncookies) { 644 ncookies = uimin(ncookies, dt->dt_nfiles + 2); 645 cookies = malloc(ncookies * sizeof(off_t), 646 M_TEMP, M_WAITOK); 647 *ap->a_cookies = cookies; 648 *ap->a_ncookies = ncookies; 649 } 650 for (; i - 2 < dt->dt_nfiles && uio->uio_resid >= UIO_MX; i++) { 651 switch (i) { 652 case 0: 653 case 1: 654 d.d_fileno = FD_ROOT; /* XXX */ 655 d.d_namlen = i + 1; 656 (void)memcpy(d.d_name, "..", d.d_namlen); 657 d.d_name[i + 1] = '\0'; 658 d.d_type = DT_DIR; 659 break; 660 661 default: 662 j = (int)i - 2; 663 if (dt->dt_ff[j] == NULL || 664 dt->dt_ff[j]->ff_file == NULL) 665 continue; 666 d.d_fileno = j + FD_STDIN; 667 d.d_namlen = snprintf(d.d_name, 668 sizeof(d.d_name), "%d", j); 669 d.d_type = DT_UNKNOWN; 670 break; 671 } 672 673 if ((error = uiomove(&d, UIO_MX, uio)) != 0) 674 break; 675 if (cookies) 676 *cookies++ = i + 1; 677 } 678 } 679 680 if (ap->a_ncookies && error) { 681 free(*ap->a_cookies, M_TEMP); 682 *ap->a_ncookies = 0; 683 *ap->a_cookies = NULL; 684 } 685 686 uio->uio_offset = i; 687 return error; 688 } 689 690 int 691 fdesc_readlink(void *v) 692 { 693 struct vop_readlink_args /* { 694 struct vnode *a_vp; 695 struct uio *a_uio; 696 kauth_cred_t a_cred; 697 } */ *ap = v; 698 struct vnode *vp = ap->a_vp; 699 int error; 700 701 if (vp->v_type != VLNK) 702 return (EPERM); 703 704 if (VTOFDESC(vp)->fd_type == Flink) { 705 const char *ln = VTOFDESC(vp)->fd_link; 706 error = uiomove(__UNCONST(ln), strlen(ln), ap->a_uio); 707 } else { 708 error = EOPNOTSUPP; 709 } 710 711 return (error); 712 } 713 714 int 715 fdesc_read(void *v) 716 { 717 struct vop_read_args /* { 718 struct vnode *a_vp; 719 struct uio *a_uio; 720 int a_ioflag; 721 kauth_cred_t a_cred; 722 } */ *ap = v; 723 int error = EOPNOTSUPP; 724 struct vnode *vp = ap->a_vp; 725 726 switch (VTOFDESC(vp)->fd_type) { 727 case Fctty: 728 VOP_UNLOCK(vp); 729 error = cdev_read(devctty, ap->a_uio, ap->a_ioflag); 730 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 731 break; 732 733 default: 734 error = EOPNOTSUPP; 735 break; 736 } 737 738 return (error); 739 } 740 741 int 742 fdesc_write(void *v) 743 { 744 struct vop_write_args /* { 745 struct vnode *a_vp; 746 struct uio *a_uio; 747 int a_ioflag; 748 kauth_cred_t a_cred; 749 } */ *ap = v; 750 int error = EOPNOTSUPP; 751 struct vnode *vp = ap->a_vp; 752 753 switch (VTOFDESC(vp)->fd_type) { 754 case Fctty: 755 VOP_UNLOCK(vp); 756 error = cdev_write(devctty, ap->a_uio, ap->a_ioflag); 757 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 758 break; 759 760 default: 761 error = EOPNOTSUPP; 762 break; 763 } 764 765 return (error); 766 } 767 768 int 769 fdesc_ioctl(void *v) 770 { 771 struct vop_ioctl_args /* { 772 struct vnode *a_vp; 773 u_long a_command; 774 void *a_data; 775 int a_fflag; 776 kauth_cred_t a_cred; 777 } */ *ap = v; 778 int error = EOPNOTSUPP; 779 780 switch (VTOFDESC(ap->a_vp)->fd_type) { 781 case Fctty: 782 error = cdev_ioctl(devctty, ap->a_command, ap->a_data, 783 ap->a_fflag, curlwp); 784 break; 785 786 default: 787 error = EOPNOTSUPP; 788 break; 789 } 790 791 return (error); 792 } 793 794 int 795 fdesc_poll(void *v) 796 { 797 struct vop_poll_args /* { 798 struct vnode *a_vp; 799 int a_events; 800 } */ *ap = v; 801 int revents; 802 803 switch (VTOFDESC(ap->a_vp)->fd_type) { 804 case Fctty: 805 revents = cdev_poll(devctty, ap->a_events, curlwp); 806 break; 807 808 default: 809 revents = genfs_poll(v); 810 break; 811 } 812 813 return (revents); 814 } 815 816 int 817 fdesc_kqfilter(void *v) 818 { 819 struct vop_kqfilter_args /* { 820 struct vnode *a_vp; 821 struct knote *a_kn; 822 } */ *ap = v; 823 int error, fd; 824 file_t *fp; 825 826 switch (VTOFDESC(ap->a_vp)->fd_type) { 827 case Fctty: 828 error = cdev_kqfilter(devctty, ap->a_kn); 829 break; 830 831 case Fdesc: 832 /* just invoke kqfilter for the underlying descriptor */ 833 fd = VTOFDESC(ap->a_vp)->fd_fd; 834 if ((fp = fd_getfile(fd)) == NULL) 835 return (1); 836 error = (*fp->f_ops->fo_kqfilter)(fp, ap->a_kn); 837 fd_putfile(fd); 838 break; 839 840 default: 841 return (genfs_kqfilter(v)); 842 } 843 844 return (error); 845 } 846 847 int 848 fdesc_inactive(void *v) 849 { 850 struct vop_inactive_v2_args /* { 851 struct vnode *a_vp; 852 } */ *ap = v; 853 struct vnode *vp = ap->a_vp; 854 struct fdescnode *fd = VTOFDESC(vp); 855 856 /* 857 * Clear out the v_type field to avoid 858 * nasty things happening on reclaim. 859 */ 860 if (fd->fd_type == Fctty || fd->fd_type == Fdesc) 861 vp->v_type = VNON; 862 863 return (0); 864 } 865 866 int 867 fdesc_reclaim(void *v) 868 { 869 struct vop_reclaim_v2_args /* { 870 struct vnode *a_vp; 871 } */ *ap = v; 872 struct vnode *vp = ap->a_vp; 873 struct fdescnode *fd = VTOFDESC(vp); 874 875 VOP_UNLOCK(vp); 876 877 vp->v_data = NULL; 878 kmem_free(fd, sizeof(struct fdescnode)); 879 880 return (0); 881 } 882 883 /* 884 * Return POSIX pathconf information applicable to special devices. 885 */ 886 int 887 fdesc_pathconf(void *v) 888 { 889 struct vop_pathconf_args /* { 890 struct vnode *a_vp; 891 int a_name; 892 register_t *a_retval; 893 } */ *ap = v; 894 895 switch (ap->a_name) { 896 case _PC_LINK_MAX: 897 *ap->a_retval = LINK_MAX; 898 return (0); 899 case _PC_MAX_CANON: 900 *ap->a_retval = MAX_CANON; 901 return (0); 902 case _PC_MAX_INPUT: 903 *ap->a_retval = MAX_INPUT; 904 return (0); 905 case _PC_PIPE_BUF: 906 *ap->a_retval = PIPE_BUF; 907 return (0); 908 case _PC_CHOWN_RESTRICTED: 909 *ap->a_retval = 1; 910 return (0); 911 case _PC_VDISABLE: 912 *ap->a_retval = _POSIX_VDISABLE; 913 return (0); 914 case _PC_SYNC_IO: 915 *ap->a_retval = 1; 916 return (0); 917 default: 918 return (EINVAL); 919 } 920 /* NOTREACHED */ 921 } 922 923 /* 924 * Print out the contents of a /dev/fd vnode. 925 */ 926 /* ARGSUSED */ 927 int 928 fdesc_print(void *v) 929 { 930 printf("tag VT_NON, fdesc vnode\n"); 931 return (0); 932 } 933 934 int 935 fdesc_link(void *v) 936 { 937 struct vop_link_v2_args /* { 938 struct vnode *a_dvp; 939 struct vnode *a_vp; 940 struct componentname *a_cnp; 941 } */ *ap = v; 942 943 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 944 return (EROFS); 945 } 946 947 int 948 fdesc_symlink(void *v) 949 { 950 struct vop_symlink_v3_args /* { 951 struct vnode *a_dvp; 952 struct vnode **a_vpp; 953 struct componentname *a_cnp; 954 struct vattr *a_vap; 955 char *a_target; 956 } */ *ap = v; 957 958 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 959 return (EROFS); 960 } 961
Indexes created Wed Oct 22 00:09:40 GMT 2025