fdesc_vnops.c revision 1.102.4.3
1 /* $NetBSD: fdesc_vnops.c,v 1.102.4.3 2009/06/20 07:20:32 yamt 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 1.102.4.3 2009/06/20 07:20:32 yamt 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 unsigned fd = 0; 280 int error; 281 struct vnode *fvp; 282 const char *ln; 283 fdtab_t *dt; 284 285 dt = curlwp->l_fd->fd_dt; 286 287 if (cnp->cn_namelen == 1 && *pname == '.') { 288 *vpp = dvp; 289 VREF(dvp); 290 return (0); 291 } 292 293 switch (VTOFDESC(dvp)->fd_type) { 294 default: 295 case Flink: 296 case Fdesc: 297 case Fctty: 298 error = ENOTDIR; 299 goto bad; 300 301 case Froot: 302 if (cnp->cn_namelen == 2 && memcmp(pname, "fd", 2) == 0) { 303 error = fdesc_allocvp(Fdevfd, FD_DEVFD, dvp->v_mount, &fvp); 304 if (error) 305 goto bad; 306 *vpp = fvp; 307 fvp->v_type = VDIR; 308 goto good; 309 } 310 311 if (cnp->cn_namelen == 3 && memcmp(pname, "tty", 3) == 0) { 312 struct vnode *ttyvp = cttyvp(p); 313 if (ttyvp == NULL) { 314 error = ENXIO; 315 goto bad; 316 } 317 error = fdesc_allocvp(Fctty, FD_CTTY, dvp->v_mount, &fvp); 318 if (error) 319 goto bad; 320 *vpp = fvp; 321 fvp->v_type = VCHR; 322 goto good; 323 } 324 325 ln = 0; 326 switch (cnp->cn_namelen) { 327 case 5: 328 if (memcmp(pname, "stdin", 5) == 0) { 329 ln = "fd/0"; 330 fd = FD_STDIN; 331 } 332 break; 333 case 6: 334 if (memcmp(pname, "stdout", 6) == 0) { 335 ln = "fd/1"; 336 fd = FD_STDOUT; 337 } else 338 if (memcmp(pname, "stderr", 6) == 0) { 339 ln = "fd/2"; 340 fd = FD_STDERR; 341 } 342 break; 343 } 344 345 if (ln) { 346 error = fdesc_allocvp(Flink, fd, dvp->v_mount, &fvp); 347 if (error) 348 goto bad; 349 /* XXXUNCONST */ 350 VTOFDESC(fvp)->fd_link = __UNCONST(ln); 351 *vpp = fvp; 352 fvp->v_type = VLNK; 353 goto good; 354 } else { 355 error = ENOENT; 356 goto bad; 357 } 358 359 /* FALL THROUGH */ 360 361 case Fdevfd: 362 if (cnp->cn_namelen == 2 && memcmp(pname, "..", 2) == 0) { 363 VOP_UNLOCK(dvp, 0); 364 error = fdesc_root(dvp->v_mount, vpp); 365 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 366 if (error) 367 goto bad; 368 return (error); 369 } 370 371 fd = 0; 372 while (*pname >= '0' && *pname <= '9') { 373 fd = 10 * fd + *pname++ - '0'; 374 if (fd >= dt->dt_nfiles) 375 break; 376 } 377 378 if (*pname != '\0') { 379 error = ENOENT; 380 goto bad; 381 } 382 383 if (fd >= dt->dt_nfiles || dt->dt_ff[fd] == NULL || 384 dt->dt_ff[fd]->ff_file == NULL) { 385 error = EBADF; 386 goto bad; 387 } 388 389 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp); 390 if (error) 391 goto bad; 392 VTOFDESC(fvp)->fd_fd = fd; 393 *vpp = fvp; 394 goto good; 395 } 396 397 bad: 398 *vpp = NULL; 399 return (error); 400 401 good: 402 return (0); 403 } 404 405 int 406 fdesc_open(void *v) 407 { 408 struct vop_open_args /* { 409 struct vnode *a_vp; 410 int a_mode; 411 kauth_cred_t a_cred; 412 } */ *ap = v; 413 struct vnode *vp = ap->a_vp; 414 415 switch (VTOFDESC(vp)->fd_type) { 416 case Fdesc: 417 /* 418 * XXX Kludge: set dupfd to contain the value of the 419 * the file descriptor being sought for duplication. The error 420 * return ensures that the vnode for this device will be 421 * released by vn_open. Open will detect this special error and 422 * take the actions in dupfdopen. Other callers of vn_open or 423 * VOP_OPEN will simply report the error. 424 */ 425 curlwp->l_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */ 426 return EDUPFD; 427 428 case Fctty: 429 return cdev_open(devctty, ap->a_mode, 0, curlwp); 430 case Froot: 431 case Fdevfd: 432 case Flink: 433 break; 434 } 435 436 return (0); 437 } 438 439 static int 440 fdesc_attr(int fd, struct vattr *vap, kauth_cred_t cred) 441 { 442 file_t *fp; 443 struct stat stb; 444 int error; 445 446 if ((fp = fd_getfile(fd)) == NULL) 447 return (EBADF); 448 449 switch (fp->f_type) { 450 case DTYPE_VNODE: 451 error = VOP_GETATTR((struct vnode *) fp->f_data, vap, cred); 452 if (error == 0 && vap->va_type == VDIR) { 453 /* 454 * directories can cause loops in the namespace, 455 * so turn off the 'x' bits to avoid trouble. 456 */ 457 vap->va_mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH); 458 } 459 break; 460 461 default: 462 memset(&stb, 0, sizeof(stb)); 463 error = (*fp->f_ops->fo_stat)(fp, &stb); 464 if (error) 465 break; 466 467 vattr_null(vap); 468 switch(fp->f_type) { 469 case DTYPE_SOCKET: 470 vap->va_type = VSOCK; 471 break; 472 case DTYPE_PIPE: 473 vap->va_type = VFIFO; 474 break; 475 default: 476 /* use VNON perhaps? */ 477 vap->va_type = VBAD; 478 break; 479 } 480 vap->va_mode = stb.st_mode; 481 vap->va_nlink = stb.st_nlink; 482 vap->va_uid = stb.st_uid; 483 vap->va_gid = stb.st_gid; 484 vap->va_fsid = stb.st_dev; 485 vap->va_fileid = stb.st_ino; 486 vap->va_size = stb.st_size; 487 vap->va_blocksize = stb.st_blksize; 488 vap->va_atime = stb.st_atimespec; 489 vap->va_mtime = stb.st_mtimespec; 490 vap->va_ctime = stb.st_ctimespec; 491 vap->va_gen = stb.st_gen; 492 vap->va_flags = stb.st_flags; 493 vap->va_rdev = stb.st_rdev; 494 vap->va_bytes = stb.st_blocks * stb.st_blksize; 495 break; 496 } 497 498 fd_putfile(fd); 499 return (error); 500 } 501 502 int 503 fdesc_getattr(void *v) 504 { 505 struct vop_getattr_args /* { 506 struct vnode *a_vp; 507 struct vattr *a_vap; 508 kauth_cred_t a_cred; 509 struct lwp *a_l; 510 } */ *ap = v; 511 struct vnode *vp = ap->a_vp; 512 struct vattr *vap = ap->a_vap; 513 unsigned fd; 514 int error = 0; 515 516 switch (VTOFDESC(vp)->fd_type) { 517 case Froot: 518 case Fdevfd: 519 case Flink: 520 case Fctty: 521 VATTR_NULL(vap); 522 vap->va_fileid = VTOFDESC(vp)->fd_ix; 523 524 #define R_ALL (S_IRUSR|S_IRGRP|S_IROTH) 525 #define W_ALL (S_IWUSR|S_IWGRP|S_IWOTH) 526 #define X_ALL (S_IXUSR|S_IXGRP|S_IXOTH) 527 528 switch (VTOFDESC(vp)->fd_type) { 529 case Flink: 530 vap->va_mode = R_ALL|X_ALL; 531 vap->va_type = VLNK; 532 vap->va_rdev = 0; 533 vap->va_nlink = 1; 534 vap->va_size = strlen(VTOFDESC(vp)->fd_link); 535 break; 536 537 case Fctty: 538 vap->va_mode = R_ALL|W_ALL; 539 vap->va_type = VCHR; 540 vap->va_rdev = devctty; 541 vap->va_nlink = 1; 542 vap->va_size = 0; 543 break; 544 545 default: 546 vap->va_mode = R_ALL|X_ALL; 547 vap->va_type = VDIR; 548 vap->va_rdev = 0; 549 vap->va_nlink = 2; 550 vap->va_size = DEV_BSIZE; 551 break; 552 } 553 vap->va_uid = 0; 554 vap->va_gid = 0; 555 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 556 vap->va_blocksize = DEV_BSIZE; 557 vap->va_atime.tv_sec = boottime.tv_sec; 558 vap->va_atime.tv_nsec = 0; 559 vap->va_mtime = vap->va_atime; 560 vap->va_ctime = vap->va_mtime; 561 vap->va_gen = 0; 562 vap->va_flags = 0; 563 vap->va_bytes = 0; 564 break; 565 566 case Fdesc: 567 fd = VTOFDESC(vp)->fd_fd; 568 error = fdesc_attr(fd, vap, ap->a_cred); 569 break; 570 571 default: 572 panic("fdesc_getattr"); 573 break; 574 } 575 576 if (error == 0) 577 vp->v_type = vap->va_type; 578 579 return (error); 580 } 581 582 int 583 fdesc_setattr(void *v) 584 { 585 struct vop_setattr_args /* { 586 struct vnode *a_vp; 587 struct vattr *a_vap; 588 kauth_cred_t a_cred; 589 } */ *ap = v; 590 file_t *fp; 591 unsigned fd; 592 593 /* 594 * Can't mess with the root vnode 595 */ 596 switch (VTOFDESC(ap->a_vp)->fd_type) { 597 case Fdesc: 598 break; 599 600 case Fctty: 601 return (0); 602 603 default: 604 return (EACCES); 605 } 606 607 fd = VTOFDESC(ap->a_vp)->fd_fd; 608 if ((fp = fd_getfile(fd)) == NULL) 609 return (EBADF); 610 611 /* 612 * XXX: Can't reasonably set the attr's on any types currently. 613 * On vnode's this will cause truncation and socket/pipes make 614 * no sense. 615 */ 616 fd_putfile(fd); 617 return (0); 618 } 619 620 621 struct fdesc_target { 622 ino_t ft_fileno; 623 u_char ft_type; 624 u_char ft_namlen; 625 const char *ft_name; 626 } fdesc_targets[] = { 627 #define N(s) sizeof(s)-1, s 628 { FD_DEVFD, DT_DIR, N("fd") }, 629 { FD_STDIN, DT_LNK, N("stdin") }, 630 { FD_STDOUT, DT_LNK, N("stdout") }, 631 { FD_STDERR, DT_LNK, N("stderr") }, 632 { FD_CTTY, DT_UNKNOWN, N("tty") }, 633 #undef N 634 #define UIO_MX _DIRENT_RECLEN((struct dirent *)NULL, sizeof("stderr") - 1) 635 }; 636 static int nfdesc_targets = sizeof(fdesc_targets) / sizeof(fdesc_targets[0]); 637 638 int 639 fdesc_readdir(void *v) 640 { 641 struct vop_readdir_args /* { 642 struct vnode *a_vp; 643 struct uio *a_uio; 644 kauth_cred_t a_cred; 645 int *a_eofflag; 646 off_t **a_cookies; 647 int *a_ncookies; 648 } */ *ap = v; 649 struct uio *uio = ap->a_uio; 650 struct dirent d; 651 off_t i; 652 int j; 653 int error; 654 off_t *cookies = NULL; 655 int ncookies; 656 fdtab_t *dt; 657 658 switch (VTOFDESC(ap->a_vp)->fd_type) { 659 case Fctty: 660 return 0; 661 662 case Fdesc: 663 return ENOTDIR; 664 665 default: 666 break; 667 } 668 669 dt = curlwp->l_fd->fd_dt; 670 671 if (uio->uio_resid < UIO_MX) 672 return EINVAL; 673 if (uio->uio_offset < 0) 674 return EINVAL; 675 676 error = 0; 677 i = uio->uio_offset; 678 (void)memset(&d, 0, UIO_MX); 679 d.d_reclen = UIO_MX; 680 if (ap->a_ncookies) 681 ncookies = uio->uio_resid / UIO_MX; 682 else 683 ncookies = 0; 684 685 if (VTOFDESC(ap->a_vp)->fd_type == Froot) { 686 struct fdesc_target *ft; 687 688 if (i >= nfdesc_targets) 689 return 0; 690 691 if (ap->a_ncookies) { 692 ncookies = min(ncookies, (nfdesc_targets - i)); 693 cookies = malloc(ncookies * sizeof(off_t), 694 M_TEMP, M_WAITOK); 695 *ap->a_cookies = cookies; 696 *ap->a_ncookies = ncookies; 697 } 698 699 for (ft = &fdesc_targets[i]; uio->uio_resid >= UIO_MX && 700 i < nfdesc_targets; ft++, i++) { 701 switch (ft->ft_fileno) { 702 case FD_CTTY: 703 if (cttyvp(curproc) == NULL) 704 continue; 705 break; 706 707 case FD_STDIN: 708 case FD_STDOUT: 709 case FD_STDERR: 710 if ((ft->ft_fileno - FD_STDIN) >= 711 dt->dt_nfiles) 712 continue; 713 if (dt->dt_ff[ft->ft_fileno - FD_STDIN] 714 == NULL || dt->dt_ff[ft->ft_fileno - 715 FD_STDIN]->ff_file == NULL) 716 continue; 717 break; 718 } 719 720 d.d_fileno = ft->ft_fileno; 721 d.d_namlen = ft->ft_namlen; 722 (void)memcpy(d.d_name, ft->ft_name, ft->ft_namlen + 1); 723 d.d_type = ft->ft_type; 724 725 if ((error = uiomove(&d, UIO_MX, uio)) != 0) 726 break; 727 if (cookies) 728 *cookies++ = i + 1; 729 } 730 } else { 731 membar_consumer(); 732 if (ap->a_ncookies) { 733 ncookies = min(ncookies, dt->dt_nfiles + 2); 734 cookies = malloc(ncookies * sizeof(off_t), 735 M_TEMP, M_WAITOK); 736 *ap->a_cookies = cookies; 737 *ap->a_ncookies = ncookies; 738 } 739 for (; i - 2 < dt->dt_nfiles && uio->uio_resid >= UIO_MX; i++) { 740 switch (i) { 741 case 0: 742 case 1: 743 d.d_fileno = FD_ROOT; /* XXX */ 744 d.d_namlen = i + 1; 745 (void)memcpy(d.d_name, "..", d.d_namlen); 746 d.d_name[i + 1] = '\0'; 747 d.d_type = DT_DIR; 748 break; 749 750 default: 751 j = (int)i - 2; 752 if (dt->dt_ff[j] == NULL || 753 dt->dt_ff[j]->ff_file == NULL) 754 continue; 755 d.d_fileno = j + FD_STDIN; 756 d.d_namlen = sprintf(d.d_name, "%d", j); 757 d.d_type = DT_UNKNOWN; 758 break; 759 } 760 761 if ((error = uiomove(&d, UIO_MX, uio)) != 0) 762 break; 763 if (cookies) 764 *cookies++ = i + 1; 765 } 766 } 767 768 if (ap->a_ncookies && error) { 769 free(*ap->a_cookies, M_TEMP); 770 *ap->a_ncookies = 0; 771 *ap->a_cookies = NULL; 772 } 773 774 uio->uio_offset = i; 775 return error; 776 } 777 778 int 779 fdesc_readlink(void *v) 780 { 781 struct vop_readlink_args /* { 782 struct vnode *a_vp; 783 struct uio *a_uio; 784 kauth_cred_t a_cred; 785 } */ *ap = v; 786 struct vnode *vp = ap->a_vp; 787 int error; 788 789 if (vp->v_type != VLNK) 790 return (EPERM); 791 792 if (VTOFDESC(vp)->fd_type == Flink) { 793 char *ln = VTOFDESC(vp)->fd_link; 794 error = uiomove(ln, strlen(ln), ap->a_uio); 795 } else { 796 error = EOPNOTSUPP; 797 } 798 799 return (error); 800 } 801 802 int 803 fdesc_read(void *v) 804 { 805 struct vop_read_args /* { 806 struct vnode *a_vp; 807 struct uio *a_uio; 808 int a_ioflag; 809 kauth_cred_t a_cred; 810 } */ *ap = v; 811 int error = EOPNOTSUPP; 812 struct vnode *vp = ap->a_vp; 813 814 switch (VTOFDESC(vp)->fd_type) { 815 case Fctty: 816 VOP_UNLOCK(vp, 0); 817 error = cdev_read(devctty, ap->a_uio, ap->a_ioflag); 818 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 819 break; 820 821 default: 822 error = EOPNOTSUPP; 823 break; 824 } 825 826 return (error); 827 } 828 829 int 830 fdesc_write(void *v) 831 { 832 struct vop_write_args /* { 833 struct vnode *a_vp; 834 struct uio *a_uio; 835 int a_ioflag; 836 kauth_cred_t a_cred; 837 } */ *ap = v; 838 int error = EOPNOTSUPP; 839 struct vnode *vp = ap->a_vp; 840 841 switch (VTOFDESC(vp)->fd_type) { 842 case Fctty: 843 VOP_UNLOCK(vp, 0); 844 error = cdev_write(devctty, ap->a_uio, ap->a_ioflag); 845 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 846 break; 847 848 default: 849 error = EOPNOTSUPP; 850 break; 851 } 852 853 return (error); 854 } 855 856 int 857 fdesc_ioctl(void *v) 858 { 859 struct vop_ioctl_args /* { 860 struct vnode *a_vp; 861 u_long a_command; 862 void *a_data; 863 int a_fflag; 864 kauth_cred_t a_cred; 865 } */ *ap = v; 866 int error = EOPNOTSUPP; 867 868 switch (VTOFDESC(ap->a_vp)->fd_type) { 869 case Fctty: 870 error = cdev_ioctl(devctty, ap->a_command, ap->a_data, 871 ap->a_fflag, curlwp); 872 break; 873 874 default: 875 error = EOPNOTSUPP; 876 break; 877 } 878 879 return (error); 880 } 881 882 int 883 fdesc_poll(void *v) 884 { 885 struct vop_poll_args /* { 886 struct vnode *a_vp; 887 int a_events; 888 } */ *ap = v; 889 int revents; 890 891 switch (VTOFDESC(ap->a_vp)->fd_type) { 892 case Fctty: 893 revents = cdev_poll(devctty, ap->a_events, curlwp); 894 break; 895 896 default: 897 revents = genfs_poll(v); 898 break; 899 } 900 901 return (revents); 902 } 903 904 int 905 fdesc_kqfilter(void *v) 906 { 907 struct vop_kqfilter_args /* { 908 struct vnode *a_vp; 909 struct knote *a_kn; 910 } */ *ap = v; 911 int error, fd; 912 file_t *fp; 913 914 switch (VTOFDESC(ap->a_vp)->fd_type) { 915 case Fctty: 916 error = cdev_kqfilter(devctty, ap->a_kn); 917 break; 918 919 case Fdesc: 920 /* just invoke kqfilter for the underlying descriptor */ 921 fd = VTOFDESC(ap->a_vp)->fd_fd; 922 if ((fp = fd_getfile(fd)) == NULL) 923 return (1); 924 error = (*fp->f_ops->fo_kqfilter)(fp, ap->a_kn); 925 fd_putfile(fd); 926 break; 927 928 default: 929 return (genfs_kqfilter(v)); 930 } 931 932 return (error); 933 } 934 935 int 936 fdesc_inactive(void *v) 937 { 938 struct vop_inactive_args /* { 939 struct vnode *a_vp; 940 } */ *ap = v; 941 struct vnode *vp = ap->a_vp; 942 943 /* 944 * Clear out the v_type field to avoid 945 * nasty things happening in vgone(). 946 */ 947 VOP_UNLOCK(vp, 0); 948 vp->v_type = VNON; 949 return (0); 950 } 951 952 int 953 fdesc_reclaim(void *v) 954 { 955 struct vop_reclaim_args /* { 956 struct vnode *a_vp; 957 } */ *ap = v; 958 struct vnode *vp = ap->a_vp; 959 struct fdescnode *fd = VTOFDESC(vp); 960 961 LIST_REMOVE(fd, fd_hash); 962 free(vp->v_data, M_TEMP); 963 vp->v_data = 0; 964 965 return (0); 966 } 967 968 /* 969 * Return POSIX pathconf information applicable to special devices. 970 */ 971 int 972 fdesc_pathconf(void *v) 973 { 974 struct vop_pathconf_args /* { 975 struct vnode *a_vp; 976 int a_name; 977 register_t *a_retval; 978 } */ *ap = v; 979 980 switch (ap->a_name) { 981 case _PC_LINK_MAX: 982 *ap->a_retval = LINK_MAX; 983 return (0); 984 case _PC_MAX_CANON: 985 *ap->a_retval = MAX_CANON; 986 return (0); 987 case _PC_MAX_INPUT: 988 *ap->a_retval = MAX_INPUT; 989 return (0); 990 case _PC_PIPE_BUF: 991 *ap->a_retval = PIPE_BUF; 992 return (0); 993 case _PC_CHOWN_RESTRICTED: 994 *ap->a_retval = 1; 995 return (0); 996 case _PC_VDISABLE: 997 *ap->a_retval = _POSIX_VDISABLE; 998 return (0); 999 case _PC_SYNC_IO: 1000 *ap->a_retval = 1; 1001 return (0); 1002 default: 1003 return (EINVAL); 1004 } 1005 /* NOTREACHED */ 1006 } 1007 1008 /* 1009 * Print out the contents of a /dev/fd vnode. 1010 */ 1011 /* ARGSUSED */ 1012 int 1013 fdesc_print(void *v) 1014 { 1015 printf("tag VT_NON, fdesc vnode\n"); 1016 return (0); 1017 } 1018 1019 int 1020 fdesc_link(void *v) 1021 { 1022 struct vop_link_args /* { 1023 struct vnode *a_dvp; 1024 struct vnode *a_vp; 1025 struct componentname *a_cnp; 1026 } */ *ap = v; 1027 1028 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 1029 vput(ap->a_dvp); 1030 return (EROFS); 1031 } 1032 1033 int 1034 fdesc_symlink(void *v) 1035 { 1036 struct vop_symlink_args /* { 1037 struct vnode *a_dvp; 1038 struct vnode **a_vpp; 1039 struct componentname *a_cnp; 1040 struct vattr *a_vap; 1041 char *a_target; 1042 } */ *ap = v; 1043 1044 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 1045 vput(ap->a_dvp); 1046 return (EROFS); 1047 } 1048
Indexes created Wed Oct 22 00:09:40 GMT 2025