fdesc_vnops.c revision 1.106
1 /* $NetBSD: fdesc_vnops.c,v 1.106 2009/03/15 17:22:37 cegger 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 1.106 2009/03/15 17:22:37 cegger 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 #define FDL_WANT 0x01 73 #define FDL_LOCKED 0x02 74 static int fdcache_lock; 75 76 dev_t devctty; 77 78 #if (FD_STDIN != FD_STDOUT-1) || (FD_STDOUT != FD_STDERR-1) 79 FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n+1, n+2 80 #endif 81 82 #define NFDCACHE 4 83 84 #define FD_NHASH(ix) \ 85 (&fdhashtbl[(ix) & fdhash]) 86 LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl; 87 u_long fdhash; 88 89 int fdesc_lookup(void *); 90 #define fdesc_create genfs_eopnotsupp 91 #define fdesc_mknod genfs_eopnotsupp 92 int fdesc_open(void *); 93 #define fdesc_close genfs_nullop 94 #define fdesc_access genfs_nullop 95 int fdesc_getattr(void *); 96 int fdesc_setattr(void *); 97 int fdesc_read(void *); 98 int fdesc_write(void *); 99 int fdesc_ioctl(void *); 100 int fdesc_poll(void *); 101 int fdesc_kqfilter(void *); 102 #define fdesc_mmap genfs_eopnotsupp 103 #define fdesc_fcntl genfs_fcntl 104 #define fdesc_fsync genfs_nullop 105 #define fdesc_seek genfs_seek 106 #define fdesc_remove genfs_eopnotsupp 107 int fdesc_link(void *); 108 #define fdesc_rename genfs_eopnotsupp 109 #define fdesc_mkdir genfs_eopnotsupp 110 #define fdesc_rmdir genfs_eopnotsupp 111 int fdesc_symlink(void *); 112 int fdesc_readdir(void *); 113 int fdesc_readlink(void *); 114 #define fdesc_abortop genfs_abortop 115 int fdesc_inactive(void *); 116 int fdesc_reclaim(void *); 117 #define fdesc_lock genfs_lock 118 #define fdesc_unlock genfs_unlock 119 #define fdesc_bmap genfs_badop 120 #define fdesc_strategy genfs_badop 121 int fdesc_print(void *); 122 int fdesc_pathconf(void *); 123 #define fdesc_islocked genfs_islocked 124 #define fdesc_advlock genfs_einval 125 #define fdesc_bwrite genfs_eopnotsupp 126 #define fdesc_revoke genfs_revoke 127 #define fdesc_putpages genfs_null_putpages 128 129 static int fdesc_attr(int, struct vattr *, kauth_cred_t); 130 131 int (**fdesc_vnodeop_p)(void *); 132 const struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = { 133 { &vop_default_desc, vn_default_error }, 134 { &vop_lookup_desc, fdesc_lookup }, /* lookup */ 135 { &vop_create_desc, fdesc_create }, /* create */ 136 { &vop_mknod_desc, fdesc_mknod }, /* mknod */ 137 { &vop_open_desc, fdesc_open }, /* open */ 138 { &vop_close_desc, fdesc_close }, /* close */ 139 { &vop_access_desc, fdesc_access }, /* access */ 140 { &vop_getattr_desc, fdesc_getattr }, /* getattr */ 141 { &vop_setattr_desc, fdesc_setattr }, /* setattr */ 142 { &vop_read_desc, fdesc_read }, /* read */ 143 { &vop_write_desc, fdesc_write }, /* write */ 144 { &vop_ioctl_desc, fdesc_ioctl }, /* ioctl */ 145 { &vop_fcntl_desc, fdesc_fcntl }, /* fcntl */ 146 { &vop_poll_desc, fdesc_poll }, /* poll */ 147 { &vop_kqfilter_desc, fdesc_kqfilter }, /* kqfilter */ 148 { &vop_revoke_desc, fdesc_revoke }, /* revoke */ 149 { &vop_mmap_desc, fdesc_mmap }, /* mmap */ 150 { &vop_fsync_desc, fdesc_fsync }, /* fsync */ 151 { &vop_seek_desc, fdesc_seek }, /* seek */ 152 { &vop_remove_desc, fdesc_remove }, /* remove */ 153 { &vop_link_desc, fdesc_link }, /* link */ 154 { &vop_rename_desc, fdesc_rename }, /* rename */ 155 { &vop_mkdir_desc, fdesc_mkdir }, /* mkdir */ 156 { &vop_rmdir_desc, fdesc_rmdir }, /* rmdir */ 157 { &vop_symlink_desc, fdesc_symlink }, /* symlink */ 158 { &vop_readdir_desc, fdesc_readdir }, /* readdir */ 159 { &vop_readlink_desc, fdesc_readlink }, /* readlink */ 160 { &vop_abortop_desc, fdesc_abortop }, /* abortop */ 161 { &vop_inactive_desc, fdesc_inactive }, /* inactive */ 162 { &vop_reclaim_desc, fdesc_reclaim }, /* reclaim */ 163 { &vop_lock_desc, fdesc_lock }, /* lock */ 164 { &vop_unlock_desc, fdesc_unlock }, /* unlock */ 165 { &vop_bmap_desc, fdesc_bmap }, /* bmap */ 166 { &vop_strategy_desc, fdesc_strategy }, /* strategy */ 167 { &vop_print_desc, fdesc_print }, /* print */ 168 { &vop_islocked_desc, fdesc_islocked }, /* islocked */ 169 { &vop_pathconf_desc, fdesc_pathconf }, /* pathconf */ 170 { &vop_advlock_desc, fdesc_advlock }, /* advlock */ 171 { &vop_bwrite_desc, fdesc_bwrite }, /* bwrite */ 172 { &vop_putpages_desc, fdesc_putpages }, /* putpages */ 173 { NULL, NULL } 174 }; 175 176 const struct vnodeopv_desc fdesc_vnodeop_opv_desc = 177 { &fdesc_vnodeop_p, fdesc_vnodeop_entries }; 178 179 extern const struct cdevsw ctty_cdevsw; 180 181 /* 182 * Initialise cache headers 183 */ 184 void 185 fdesc_init(void) 186 { 187 int cttymajor; 188 189 /* locate the major number */ 190 cttymajor = cdevsw_lookup_major(&ctty_cdevsw); 191 devctty = makedev(cttymajor, 0); 192 fdhashtbl = hashinit(NFDCACHE, HASH_LIST, true, &fdhash); 193 } 194 195 /* 196 * Free hash table. 197 */ 198 void 199 fdesc_done(void) 200 { 201 hashdone(fdhashtbl, HASH_LIST, fdhash); 202 } 203 204 /* 205 * Return a locked vnode of the correct type. 206 */ 207 int 208 fdesc_allocvp(fdntype ftype, int ix, struct mount *mp, struct vnode **vpp) 209 { 210 struct fdhashhead *fc; 211 struct fdescnode *fd; 212 int error = 0; 213 214 fc = FD_NHASH(ix); 215 loop: 216 for (fd = fc->lh_first; fd != 0; fd = fd->fd_hash.le_next) { 217 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) { 218 if (vget(fd->fd_vnode, LK_EXCLUSIVE)) 219 goto loop; 220 *vpp = fd->fd_vnode; 221 return (error); 222 } 223 } 224 225 /* 226 * otherwise lock the array while we call getnewvnode 227 * since that can block. 228 */ 229 if (fdcache_lock & FDL_LOCKED) { 230 fdcache_lock |= FDL_WANT; 231 (void) tsleep(&fdcache_lock, PINOD, "fdcache", 0); 232 goto loop; 233 } 234 fdcache_lock |= FDL_LOCKED; 235 236 error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp); 237 if (error) 238 goto out; 239 fd = malloc(sizeof(struct fdescnode), M_TEMP, M_WAITOK); 240 (*vpp)->v_data = fd; 241 fd->fd_vnode = *vpp; 242 fd->fd_type = ftype; 243 fd->fd_fd = -1; 244 fd->fd_link = 0; 245 fd->fd_ix = ix; 246 uvm_vnp_setsize(*vpp, 0); 247 VOP_LOCK(*vpp, LK_EXCLUSIVE); 248 LIST_INSERT_HEAD(fc, fd, fd_hash); 249 250 out:; 251 fdcache_lock &= ~FDL_LOCKED; 252 253 if (fdcache_lock & FDL_WANT) { 254 fdcache_lock &= ~FDL_WANT; 255 wakeup(&fdcache_lock); 256 } 257 258 return (error); 259 } 260 261 /* 262 * vp is the current namei directory 263 * ndp is the name to locate in that directory... 264 */ 265 int 266 fdesc_lookup(void *v) 267 { 268 struct vop_lookup_args /* { 269 struct vnode * a_dvp; 270 struct vnode ** a_vpp; 271 struct componentname * a_cnp; 272 } */ *ap = v; 273 struct vnode **vpp = ap->a_vpp; 274 struct vnode *dvp = ap->a_dvp; 275 struct componentname *cnp = ap->a_cnp; 276 struct lwp *l = curlwp; 277 const char *pname = cnp->cn_nameptr; 278 struct proc *p = l->l_proc; 279 filedesc_t *fdp = p->p_fd; 280 int numfiles = fdp->fd_nfiles; 281 unsigned fd = 0; 282 int error; 283 struct vnode *fvp; 284 const char *ln; 285 286 if (cnp->cn_namelen == 1 && *pname == '.') { 287 *vpp = dvp; 288 VREF(dvp); 289 return (0); 290 } 291 292 switch (VTOFDESC(dvp)->fd_type) { 293 default: 294 case Flink: 295 case Fdesc: 296 case Fctty: 297 error = ENOTDIR; 298 goto bad; 299 300 case Froot: 301 if (cnp->cn_namelen == 2 && memcmp(pname, "fd", 2) == 0) { 302 error = fdesc_allocvp(Fdevfd, FD_DEVFD, dvp->v_mount, &fvp); 303 if (error) 304 goto bad; 305 *vpp = fvp; 306 fvp->v_type = VDIR; 307 goto good; 308 } 309 310 if (cnp->cn_namelen == 3 && memcmp(pname, "tty", 3) == 0) { 311 struct vnode *ttyvp = cttyvp(p); 312 if (ttyvp == NULL) { 313 error = ENXIO; 314 goto bad; 315 } 316 error = fdesc_allocvp(Fctty, FD_CTTY, dvp->v_mount, &fvp); 317 if (error) 318 goto bad; 319 *vpp = fvp; 320 fvp->v_type = VCHR; 321 goto good; 322 } 323 324 ln = 0; 325 switch (cnp->cn_namelen) { 326 case 5: 327 if (memcmp(pname, "stdin", 5) == 0) { 328 ln = "fd/0"; 329 fd = FD_STDIN; 330 } 331 break; 332 case 6: 333 if (memcmp(pname, "stdout", 6) == 0) { 334 ln = "fd/1"; 335 fd = FD_STDOUT; 336 } else 337 if (memcmp(pname, "stderr", 6) == 0) { 338 ln = "fd/2"; 339 fd = FD_STDERR; 340 } 341 break; 342 } 343 344 if (ln) { 345 error = fdesc_allocvp(Flink, fd, dvp->v_mount, &fvp); 346 if (error) 347 goto bad; 348 /* XXXUNCONST */ 349 VTOFDESC(fvp)->fd_link = __UNCONST(ln); 350 *vpp = fvp; 351 fvp->v_type = VLNK; 352 goto good; 353 } else { 354 error = ENOENT; 355 goto bad; 356 } 357 358 /* FALL THROUGH */ 359 360 case Fdevfd: 361 if (cnp->cn_namelen == 2 && memcmp(pname, "..", 2) == 0) { 362 VOP_UNLOCK(dvp, 0); 363 error = fdesc_root(dvp->v_mount, vpp); 364 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 365 if (error) 366 goto bad; 367 return (error); 368 } 369 370 fd = 0; 371 while (*pname >= '0' && *pname <= '9') { 372 fd = 10 * fd + *pname++ - '0'; 373 if (fd >= numfiles) 374 break; 375 } 376 377 if (*pname != '\0') { 378 error = ENOENT; 379 goto bad; 380 } 381 382 mutex_enter(&fdp->fd_lock); 383 if (fd >= numfiles ||fdp->fd_ofiles[fd] == NULL || 384 fdp->fd_ofiles[fd]->ff_file == NULL) { 385 mutex_exit(&fdp->fd_lock); 386 error = EBADF; 387 goto bad; 388 } 389 mutex_exit(&fdp->fd_lock); 390 391 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp); 392 if (error) 393 goto bad; 394 VTOFDESC(fvp)->fd_fd = fd; 395 *vpp = fvp; 396 goto good; 397 } 398 399 bad: 400 *vpp = NULL; 401 return (error); 402 403 good: 404 return (0); 405 } 406 407 int 408 fdesc_open(void *v) 409 { 410 struct vop_open_args /* { 411 struct vnode *a_vp; 412 int a_mode; 413 kauth_cred_t a_cred; 414 } */ *ap = v; 415 struct vnode *vp = ap->a_vp; 416 417 switch (VTOFDESC(vp)->fd_type) { 418 case Fdesc: 419 /* 420 * XXX Kludge: set dupfd to contain the value of the 421 * the file descriptor being sought for duplication. The error 422 * return ensures that the vnode for this device will be 423 * released by vn_open. Open will detect this special error and 424 * take the actions in dupfdopen. Other callers of vn_open or 425 * VOP_OPEN will simply report the error. 426 */ 427 curlwp->l_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */ 428 return EDUPFD; 429 430 case Fctty: 431 return cdev_open(devctty, ap->a_mode, 0, curlwp); 432 case Froot: 433 case Fdevfd: 434 case Flink: 435 break; 436 } 437 438 return (0); 439 } 440 441 static int 442 fdesc_attr(int fd, struct vattr *vap, kauth_cred_t cred) 443 { 444 file_t *fp; 445 struct stat stb; 446 int error; 447 448 if ((fp = fd_getfile(fd)) == NULL) 449 return (EBADF); 450 451 switch (fp->f_type) { 452 case DTYPE_VNODE: 453 error = VOP_GETATTR((struct vnode *) fp->f_data, vap, cred); 454 if (error == 0 && vap->va_type == VDIR) { 455 /* 456 * directories can cause loops in the namespace, 457 * so turn off the 'x' bits to avoid trouble. 458 */ 459 vap->va_mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH); 460 } 461 break; 462 463 default: 464 memset(&stb, 0, sizeof(stb)); 465 error = (*fp->f_ops->fo_stat)(fp, &stb); 466 if (error) 467 break; 468 469 vattr_null(vap); 470 switch(fp->f_type) { 471 case DTYPE_SOCKET: 472 vap->va_type = VSOCK; 473 break; 474 case DTYPE_PIPE: 475 vap->va_type = VFIFO; 476 break; 477 default: 478 /* use VNON perhaps? */ 479 vap->va_type = VBAD; 480 break; 481 } 482 vap->va_mode = stb.st_mode; 483 vap->va_nlink = stb.st_nlink; 484 vap->va_uid = stb.st_uid; 485 vap->va_gid = stb.st_gid; 486 vap->va_fsid = stb.st_dev; 487 vap->va_fileid = stb.st_ino; 488 vap->va_size = stb.st_size; 489 vap->va_blocksize = stb.st_blksize; 490 vap->va_atime = stb.st_atimespec; 491 vap->va_mtime = stb.st_mtimespec; 492 vap->va_ctime = stb.st_ctimespec; 493 vap->va_gen = stb.st_gen; 494 vap->va_flags = stb.st_flags; 495 vap->va_rdev = stb.st_rdev; 496 vap->va_bytes = stb.st_blocks * stb.st_blksize; 497 break; 498 } 499 500 fd_putfile(fd); 501 return (error); 502 } 503 504 int 505 fdesc_getattr(void *v) 506 { 507 struct vop_getattr_args /* { 508 struct vnode *a_vp; 509 struct vattr *a_vap; 510 kauth_cred_t a_cred; 511 struct lwp *a_l; 512 } */ *ap = v; 513 struct vnode *vp = ap->a_vp; 514 struct vattr *vap = ap->a_vap; 515 unsigned fd; 516 int error = 0; 517 518 switch (VTOFDESC(vp)->fd_type) { 519 case Froot: 520 case Fdevfd: 521 case Flink: 522 case Fctty: 523 VATTR_NULL(vap); 524 vap->va_fileid = VTOFDESC(vp)->fd_ix; 525 526 #define R_ALL (S_IRUSR|S_IRGRP|S_IROTH) 527 #define W_ALL (S_IWUSR|S_IWGRP|S_IWOTH) 528 #define X_ALL (S_IXUSR|S_IXGRP|S_IXOTH) 529 530 switch (VTOFDESC(vp)->fd_type) { 531 case Flink: 532 vap->va_mode = R_ALL|X_ALL; 533 vap->va_type = VLNK; 534 vap->va_rdev = 0; 535 vap->va_nlink = 1; 536 vap->va_size = strlen(VTOFDESC(vp)->fd_link); 537 break; 538 539 case Fctty: 540 vap->va_mode = R_ALL|W_ALL; 541 vap->va_type = VCHR; 542 vap->va_rdev = devctty; 543 vap->va_nlink = 1; 544 vap->va_size = 0; 545 break; 546 547 default: 548 vap->va_mode = R_ALL|X_ALL; 549 vap->va_type = VDIR; 550 vap->va_rdev = 0; 551 vap->va_nlink = 2; 552 vap->va_size = DEV_BSIZE; 553 break; 554 } 555 vap->va_uid = 0; 556 vap->va_gid = 0; 557 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 558 vap->va_blocksize = DEV_BSIZE; 559 vap->va_atime.tv_sec = boottime.tv_sec; 560 vap->va_atime.tv_nsec = 0; 561 vap->va_mtime = vap->va_atime; 562 vap->va_ctime = vap->va_mtime; 563 vap->va_gen = 0; 564 vap->va_flags = 0; 565 vap->va_bytes = 0; 566 break; 567 568 case Fdesc: 569 fd = VTOFDESC(vp)->fd_fd; 570 error = fdesc_attr(fd, vap, ap->a_cred); 571 break; 572 573 default: 574 panic("fdesc_getattr"); 575 break; 576 } 577 578 if (error == 0) 579 vp->v_type = vap->va_type; 580 581 return (error); 582 } 583 584 int 585 fdesc_setattr(void *v) 586 { 587 struct vop_setattr_args /* { 588 struct vnode *a_vp; 589 struct vattr *a_vap; 590 kauth_cred_t a_cred; 591 } */ *ap = v; 592 file_t *fp; 593 unsigned fd; 594 595 /* 596 * Can't mess with the root vnode 597 */ 598 switch (VTOFDESC(ap->a_vp)->fd_type) { 599 case Fdesc: 600 break; 601 602 case Fctty: 603 return (0); 604 605 default: 606 return (EACCES); 607 } 608 609 fd = VTOFDESC(ap->a_vp)->fd_fd; 610 if ((fp = fd_getfile(fd)) == NULL) 611 return (EBADF); 612 613 /* 614 * XXX: Can't reasonably set the attr's on any types currently. 615 * On vnode's this will cause truncation and socket/pipes make 616 * no sense. 617 */ 618 fd_putfile(fd); 619 return (0); 620 } 621 622 623 struct fdesc_target { 624 ino_t ft_fileno; 625 u_char ft_type; 626 u_char ft_namlen; 627 const char *ft_name; 628 } fdesc_targets[] = { 629 #define N(s) sizeof(s)-1, s 630 { FD_DEVFD, DT_DIR, N("fd") }, 631 { FD_STDIN, DT_LNK, N("stdin") }, 632 { FD_STDOUT, DT_LNK, N("stdout") }, 633 { FD_STDERR, DT_LNK, N("stderr") }, 634 { FD_CTTY, DT_UNKNOWN, N("tty") }, 635 #undef N 636 #define UIO_MX _DIRENT_RECLEN((struct dirent *)NULL, sizeof("stderr") - 1) 637 }; 638 static int nfdesc_targets = sizeof(fdesc_targets) / sizeof(fdesc_targets[0]); 639 640 int 641 fdesc_readdir(void *v) 642 { 643 struct vop_readdir_args /* { 644 struct vnode *a_vp; 645 struct uio *a_uio; 646 kauth_cred_t a_cred; 647 int *a_eofflag; 648 off_t **a_cookies; 649 int *a_ncookies; 650 } */ *ap = v; 651 struct uio *uio = ap->a_uio; 652 struct dirent d; 653 filedesc_t *fdp; 654 off_t i; 655 int j; 656 int error; 657 off_t *cookies = NULL; 658 int ncookies; 659 660 switch (VTOFDESC(ap->a_vp)->fd_type) { 661 case Fctty: 662 return 0; 663 664 case Fdesc: 665 return ENOTDIR; 666 667 default: 668 break; 669 } 670 671 fdp = curproc->p_fd; 672 673 if (uio->uio_resid < UIO_MX) 674 return EINVAL; 675 if (uio->uio_offset < 0) 676 return EINVAL; 677 678 error = 0; 679 i = uio->uio_offset; 680 (void)memset(&d, 0, UIO_MX); 681 d.d_reclen = UIO_MX; 682 if (ap->a_ncookies) 683 ncookies = uio->uio_resid / UIO_MX; 684 else 685 ncookies = 0; 686 687 if (VTOFDESC(ap->a_vp)->fd_type == Froot) { 688 struct fdesc_target *ft; 689 690 if (i >= nfdesc_targets) 691 return 0; 692 693 if (ap->a_ncookies) { 694 ncookies = min(ncookies, (nfdesc_targets - i)); 695 cookies = malloc(ncookies * sizeof(off_t), 696 M_TEMP, M_WAITOK); 697 *ap->a_cookies = cookies; 698 *ap->a_ncookies = ncookies; 699 } 700 701 for (ft = &fdesc_targets[i]; uio->uio_resid >= UIO_MX && 702 i < nfdesc_targets; ft++, i++) { 703 switch (ft->ft_fileno) { 704 case FD_CTTY: 705 if (cttyvp(curproc) == NULL) 706 continue; 707 break; 708 709 case FD_STDIN: 710 case FD_STDOUT: 711 case FD_STDERR: 712 if (fdp == NULL) 713 continue; 714 if ((ft->ft_fileno - FD_STDIN) >= 715 fdp->fd_nfiles) 716 continue; 717 membar_consumer(); 718 if (fdp->fd_ofiles[ft->ft_fileno - FD_STDIN] 719 == NULL || fdp->fd_ofiles[ft->ft_fileno - 720 FD_STDIN]->ff_file == NULL) 721 continue; 722 break; 723 } 724 725 d.d_fileno = ft->ft_fileno; 726 d.d_namlen = ft->ft_namlen; 727 (void)memcpy(d.d_name, ft->ft_name, ft->ft_namlen + 1); 728 d.d_type = ft->ft_type; 729 730 if ((error = uiomove(&d, UIO_MX, uio)) != 0) 731 break; 732 if (cookies) 733 *cookies++ = i + 1; 734 } 735 } else { 736 int nfdp = fdp ? fdp->fd_nfiles : 0; 737 membar_consumer(); 738 if (ap->a_ncookies) { 739 ncookies = min(ncookies, nfdp + 2); 740 cookies = malloc(ncookies * sizeof(off_t), 741 M_TEMP, M_WAITOK); 742 *ap->a_cookies = cookies; 743 *ap->a_ncookies = ncookies; 744 } 745 for (; i - 2 < nfdp && uio->uio_resid >= UIO_MX; i++) { 746 switch (i) { 747 case 0: 748 case 1: 749 d.d_fileno = FD_ROOT; /* XXX */ 750 d.d_namlen = i + 1; 751 (void)memcpy(d.d_name, "..", d.d_namlen); 752 d.d_name[i + 1] = '\0'; 753 d.d_type = DT_DIR; 754 break; 755 756 default: 757 KASSERT(fdp != NULL); 758 j = (int)i - 2; 759 if (fdp == NULL || fdp->fd_ofiles[j] == NULL || 760 fdp->fd_ofiles[j]->ff_file == NULL) 761 continue; 762 d.d_fileno = j + FD_STDIN; 763 d.d_namlen = sprintf(d.d_name, "%d", j); 764 d.d_type = DT_UNKNOWN; 765 break; 766 } 767 768 if ((error = uiomove(&d, UIO_MX, uio)) != 0) 769 break; 770 if (cookies) 771 *cookies++ = i + 1; 772 } 773 } 774 775 if (ap->a_ncookies && error) { 776 free(*ap->a_cookies, M_TEMP); 777 *ap->a_ncookies = 0; 778 *ap->a_cookies = NULL; 779 } 780 781 uio->uio_offset = i; 782 return error; 783 } 784 785 int 786 fdesc_readlink(void *v) 787 { 788 struct vop_readlink_args /* { 789 struct vnode *a_vp; 790 struct uio *a_uio; 791 kauth_cred_t a_cred; 792 } */ *ap = v; 793 struct vnode *vp = ap->a_vp; 794 int error; 795 796 if (vp->v_type != VLNK) 797 return (EPERM); 798 799 if (VTOFDESC(vp)->fd_type == Flink) { 800 char *ln = VTOFDESC(vp)->fd_link; 801 error = uiomove(ln, strlen(ln), ap->a_uio); 802 } else { 803 error = EOPNOTSUPP; 804 } 805 806 return (error); 807 } 808 809 int 810 fdesc_read(void *v) 811 { 812 struct vop_read_args /* { 813 struct vnode *a_vp; 814 struct uio *a_uio; 815 int a_ioflag; 816 kauth_cred_t a_cred; 817 } */ *ap = v; 818 int error = EOPNOTSUPP; 819 struct vnode *vp = ap->a_vp; 820 821 switch (VTOFDESC(vp)->fd_type) { 822 case Fctty: 823 VOP_UNLOCK(vp, 0); 824 error = cdev_read(devctty, ap->a_uio, ap->a_ioflag); 825 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 826 break; 827 828 default: 829 error = EOPNOTSUPP; 830 break; 831 } 832 833 return (error); 834 } 835 836 int 837 fdesc_write(void *v) 838 { 839 struct vop_write_args /* { 840 struct vnode *a_vp; 841 struct uio *a_uio; 842 int a_ioflag; 843 kauth_cred_t a_cred; 844 } */ *ap = v; 845 int error = EOPNOTSUPP; 846 struct vnode *vp = ap->a_vp; 847 848 switch (VTOFDESC(vp)->fd_type) { 849 case Fctty: 850 VOP_UNLOCK(vp, 0); 851 error = cdev_write(devctty, ap->a_uio, ap->a_ioflag); 852 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 853 break; 854 855 default: 856 error = EOPNOTSUPP; 857 break; 858 } 859 860 return (error); 861 } 862 863 int 864 fdesc_ioctl(void *v) 865 { 866 struct vop_ioctl_args /* { 867 struct vnode *a_vp; 868 u_long a_command; 869 void *a_data; 870 int a_fflag; 871 kauth_cred_t a_cred; 872 } */ *ap = v; 873 int error = EOPNOTSUPP; 874 875 switch (VTOFDESC(ap->a_vp)->fd_type) { 876 case Fctty: 877 error = cdev_ioctl(devctty, ap->a_command, ap->a_data, 878 ap->a_fflag, curlwp); 879 break; 880 881 default: 882 error = EOPNOTSUPP; 883 break; 884 } 885 886 return (error); 887 } 888 889 int 890 fdesc_poll(void *v) 891 { 892 struct vop_poll_args /* { 893 struct vnode *a_vp; 894 int a_events; 895 } */ *ap = v; 896 int revents; 897 898 switch (VTOFDESC(ap->a_vp)->fd_type) { 899 case Fctty: 900 revents = cdev_poll(devctty, ap->a_events, curlwp); 901 break; 902 903 default: 904 revents = genfs_poll(v); 905 break; 906 } 907 908 return (revents); 909 } 910 911 int 912 fdesc_kqfilter(void *v) 913 { 914 struct vop_kqfilter_args /* { 915 struct vnode *a_vp; 916 struct knote *a_kn; 917 } */ *ap = v; 918 int error, fd; 919 file_t *fp; 920 921 switch (VTOFDESC(ap->a_vp)->fd_type) { 922 case Fctty: 923 error = cdev_kqfilter(devctty, ap->a_kn); 924 break; 925 926 case Fdesc: 927 /* just invoke kqfilter for the underlying descriptor */ 928 fd = VTOFDESC(ap->a_vp)->fd_fd; 929 if ((fp = fd_getfile(fd)) == NULL) 930 return (1); 931 error = (*fp->f_ops->fo_kqfilter)(fp, ap->a_kn); 932 fd_putfile(fd); 933 break; 934 935 default: 936 return (genfs_kqfilter(v)); 937 } 938 939 return (error); 940 } 941 942 int 943 fdesc_inactive(void *v) 944 { 945 struct vop_inactive_args /* { 946 struct vnode *a_vp; 947 } */ *ap = v; 948 struct vnode *vp = ap->a_vp; 949 950 /* 951 * Clear out the v_type field to avoid 952 * nasty things happening in vgone(). 953 */ 954 VOP_UNLOCK(vp, 0); 955 vp->v_type = VNON; 956 return (0); 957 } 958 959 int 960 fdesc_reclaim(void *v) 961 { 962 struct vop_reclaim_args /* { 963 struct vnode *a_vp; 964 } */ *ap = v; 965 struct vnode *vp = ap->a_vp; 966 struct fdescnode *fd = VTOFDESC(vp); 967 968 LIST_REMOVE(fd, fd_hash); 969 free(vp->v_data, M_TEMP); 970 vp->v_data = 0; 971 972 return (0); 973 } 974 975 /* 976 * Return POSIX pathconf information applicable to special devices. 977 */ 978 int 979 fdesc_pathconf(void *v) 980 { 981 struct vop_pathconf_args /* { 982 struct vnode *a_vp; 983 int a_name; 984 register_t *a_retval; 985 } */ *ap = v; 986 987 switch (ap->a_name) { 988 case _PC_LINK_MAX: 989 *ap->a_retval = LINK_MAX; 990 return (0); 991 case _PC_MAX_CANON: 992 *ap->a_retval = MAX_CANON; 993 return (0); 994 case _PC_MAX_INPUT: 995 *ap->a_retval = MAX_INPUT; 996 return (0); 997 case _PC_PIPE_BUF: 998 *ap->a_retval = PIPE_BUF; 999 return (0); 1000 case _PC_CHOWN_RESTRICTED: 1001 *ap->a_retval = 1; 1002 return (0); 1003 case _PC_VDISABLE: 1004 *ap->a_retval = _POSIX_VDISABLE; 1005 return (0); 1006 case _PC_SYNC_IO: 1007 *ap->a_retval = 1; 1008 return (0); 1009 default: 1010 return (EINVAL); 1011 } 1012 /* NOTREACHED */ 1013 } 1014 1015 /* 1016 * Print out the contents of a /dev/fd vnode. 1017 */ 1018 /* ARGSUSED */ 1019 int 1020 fdesc_print(void *v) 1021 { 1022 printf("tag VT_NON, fdesc vnode\n"); 1023 return (0); 1024 } 1025 1026 int 1027 fdesc_link(void *v) 1028 { 1029 struct vop_link_args /* { 1030 struct vnode *a_dvp; 1031 struct vnode *a_vp; 1032 struct componentname *a_cnp; 1033 } */ *ap = v; 1034 1035 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 1036 vput(ap->a_dvp); 1037 return (EROFS); 1038 } 1039 1040 int 1041 fdesc_symlink(void *v) 1042 { 1043 struct vop_symlink_args /* { 1044 struct vnode *a_dvp; 1045 struct vnode **a_vpp; 1046 struct componentname *a_cnp; 1047 struct vattr *a_vap; 1048 char *a_target; 1049 } */ *ap = v; 1050 1051 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 1052 vput(ap->a_dvp); 1053 return (EROFS); 1054 } 1055
Indexes created Wed Oct 22 06:10:02 GMT 2025