fdesc_vnops.c revision 1.77.2.3
1 /* $NetBSD: fdesc_vnops.c,v 1.77.2.3 2004/08/24 17:57:39 skrll 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 1.77.2.3 2004/08/24 17:57:39 skrll 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 65 #include <miscfs/fdesc/fdesc.h> 66 #include <miscfs/genfs/genfs.h> 67 68 #define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL) 69 70 #define FDL_WANT 0x01 71 #define FDL_LOCKED 0x02 72 static int fdcache_lock; 73 74 dev_t devctty; 75 76 #if (FD_STDIN != FD_STDOUT-1) || (FD_STDOUT != FD_STDERR-1) 77 FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n+1, n+2 78 #endif 79 80 #define NFDCACHE 4 81 82 #define FD_NHASH(ix) \ 83 (&fdhashtbl[(ix) & fdhash]) 84 LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl; 85 u_long fdhash; 86 87 int fdesc_lookup __P((void *)); 88 #define fdesc_create genfs_eopnotsupp 89 #define fdesc_mknod genfs_eopnotsupp 90 int fdesc_open __P((void *)); 91 #define fdesc_close genfs_nullop 92 #define fdesc_access genfs_nullop 93 int fdesc_getattr __P((void *)); 94 int fdesc_setattr __P((void *)); 95 int fdesc_read __P((void *)); 96 int fdesc_write __P((void *)); 97 int fdesc_ioctl __P((void *)); 98 int fdesc_poll __P((void *)); 99 int fdesc_kqfilter __P((void *)); 100 #define fdesc_mmap genfs_eopnotsupp 101 #define fdesc_fcntl genfs_fcntl 102 #define fdesc_fsync genfs_nullop 103 #define fdesc_seek genfs_seek 104 #define fdesc_remove genfs_eopnotsupp 105 int fdesc_link __P((void *)); 106 #define fdesc_rename genfs_eopnotsupp 107 #define fdesc_mkdir genfs_eopnotsupp 108 #define fdesc_rmdir genfs_eopnotsupp 109 int fdesc_symlink __P((void *)); 110 int fdesc_readdir __P((void *)); 111 int fdesc_readlink __P((void *)); 112 #define fdesc_abortop genfs_abortop 113 int fdesc_inactive __P((void *)); 114 int fdesc_reclaim __P((void *)); 115 #define fdesc_lock genfs_lock 116 #define fdesc_unlock genfs_unlock 117 #define fdesc_bmap genfs_badop 118 #define fdesc_strategy genfs_badop 119 int fdesc_print __P((void *)); 120 int fdesc_pathconf __P((void *)); 121 #define fdesc_islocked genfs_islocked 122 #define fdesc_advlock genfs_einval 123 #define fdesc_blkatoff genfs_eopnotsupp 124 #define fdesc_valloc genfs_eopnotsupp 125 #define fdesc_vfree genfs_nullop 126 #define fdesc_truncate genfs_eopnotsupp 127 #define fdesc_update genfs_nullop 128 #define fdesc_bwrite genfs_eopnotsupp 129 #define fdesc_revoke genfs_revoke 130 #define fdesc_putpages genfs_null_putpages 131 132 static int fdesc_attr __P((int, struct vattr *, struct ucred *, struct lwp *)); 133 134 int (**fdesc_vnodeop_p) __P((void *)); 135 const struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = { 136 { &vop_default_desc, vn_default_error }, 137 { &vop_lookup_desc, fdesc_lookup }, /* lookup */ 138 { &vop_create_desc, fdesc_create }, /* create */ 139 { &vop_mknod_desc, fdesc_mknod }, /* mknod */ 140 { &vop_open_desc, fdesc_open }, /* open */ 141 { &vop_close_desc, fdesc_close }, /* close */ 142 { &vop_access_desc, fdesc_access }, /* access */ 143 { &vop_getattr_desc, fdesc_getattr }, /* getattr */ 144 { &vop_setattr_desc, fdesc_setattr }, /* setattr */ 145 { &vop_read_desc, fdesc_read }, /* read */ 146 { &vop_write_desc, fdesc_write }, /* write */ 147 { &vop_ioctl_desc, fdesc_ioctl }, /* ioctl */ 148 { &vop_fcntl_desc, fdesc_fcntl }, /* fcntl */ 149 { &vop_poll_desc, fdesc_poll }, /* poll */ 150 { &vop_kqfilter_desc, fdesc_kqfilter }, /* kqfilter */ 151 { &vop_revoke_desc, fdesc_revoke }, /* revoke */ 152 { &vop_mmap_desc, fdesc_mmap }, /* mmap */ 153 { &vop_fsync_desc, fdesc_fsync }, /* fsync */ 154 { &vop_seek_desc, fdesc_seek }, /* seek */ 155 { &vop_remove_desc, fdesc_remove }, /* remove */ 156 { &vop_link_desc, fdesc_link }, /* link */ 157 { &vop_rename_desc, fdesc_rename }, /* rename */ 158 { &vop_mkdir_desc, fdesc_mkdir }, /* mkdir */ 159 { &vop_rmdir_desc, fdesc_rmdir }, /* rmdir */ 160 { &vop_symlink_desc, fdesc_symlink }, /* symlink */ 161 { &vop_readdir_desc, fdesc_readdir }, /* readdir */ 162 { &vop_readlink_desc, fdesc_readlink }, /* readlink */ 163 { &vop_abortop_desc, fdesc_abortop }, /* abortop */ 164 { &vop_inactive_desc, fdesc_inactive }, /* inactive */ 165 { &vop_reclaim_desc, fdesc_reclaim }, /* reclaim */ 166 { &vop_lock_desc, fdesc_lock }, /* lock */ 167 { &vop_unlock_desc, fdesc_unlock }, /* unlock */ 168 { &vop_bmap_desc, fdesc_bmap }, /* bmap */ 169 { &vop_strategy_desc, fdesc_strategy }, /* strategy */ 170 { &vop_print_desc, fdesc_print }, /* print */ 171 { &vop_islocked_desc, fdesc_islocked }, /* islocked */ 172 { &vop_pathconf_desc, fdesc_pathconf }, /* pathconf */ 173 { &vop_advlock_desc, fdesc_advlock }, /* advlock */ 174 { &vop_blkatoff_desc, fdesc_blkatoff }, /* blkatoff */ 175 { &vop_valloc_desc, fdesc_valloc }, /* valloc */ 176 { &vop_vfree_desc, fdesc_vfree }, /* vfree */ 177 { &vop_truncate_desc, fdesc_truncate }, /* truncate */ 178 { &vop_update_desc, fdesc_update }, /* update */ 179 { &vop_bwrite_desc, fdesc_bwrite }, /* bwrite */ 180 { &vop_putpages_desc, fdesc_putpages }, /* putpages */ 181 { NULL, NULL } 182 }; 183 184 const struct vnodeopv_desc fdesc_vnodeop_opv_desc = 185 { &fdesc_vnodeop_p, fdesc_vnodeop_entries }; 186 187 extern const struct cdevsw ctty_cdevsw; 188 189 /* 190 * Initialise cache headers 191 */ 192 void 193 fdesc_init() 194 { 195 int cttymajor; 196 197 /* locate the major number */ 198 cttymajor = cdevsw_lookup_major(&ctty_cdevsw); 199 devctty = makedev(cttymajor, 0); 200 fdhashtbl = hashinit(NFDCACHE, HASH_LIST, M_CACHE, M_NOWAIT, &fdhash); 201 } 202 203 /* 204 * Free hash table. 205 */ 206 void 207 fdesc_done() 208 { 209 hashdone(fdhashtbl, M_CACHE); 210 } 211 212 /* 213 * Return a locked vnode of the correct type. 214 */ 215 int 216 fdesc_allocvp(ftype, ix, mp, vpp) 217 fdntype ftype; 218 int ix; 219 struct mount *mp; 220 struct vnode **vpp; 221 { 222 struct fdhashhead *fc; 223 struct fdescnode *fd; 224 int error = 0; 225 226 fc = FD_NHASH(ix); 227 loop: 228 for (fd = fc->lh_first; fd != 0; fd = fd->fd_hash.le_next) { 229 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) { 230 if (vget(fd->fd_vnode, LK_EXCLUSIVE)) 231 goto loop; 232 *vpp = fd->fd_vnode; 233 return (error); 234 } 235 } 236 237 /* 238 * otherwise lock the array while we call getnewvnode 239 * since that can block. 240 */ 241 if (fdcache_lock & FDL_LOCKED) { 242 fdcache_lock |= FDL_WANT; 243 (void) tsleep(&fdcache_lock, PINOD, "fdcache", 0); 244 goto loop; 245 } 246 fdcache_lock |= FDL_LOCKED; 247 248 error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp); 249 if (error) 250 goto out; 251 MALLOC(fd, void *, sizeof(struct fdescnode), M_TEMP, M_WAITOK); 252 (*vpp)->v_data = fd; 253 fd->fd_vnode = *vpp; 254 fd->fd_type = ftype; 255 fd->fd_fd = -1; 256 fd->fd_link = 0; 257 fd->fd_ix = ix; 258 VOP_LOCK(*vpp, LK_EXCLUSIVE); 259 LIST_INSERT_HEAD(fc, fd, fd_hash); 260 261 out:; 262 fdcache_lock &= ~FDL_LOCKED; 263 264 if (fdcache_lock & FDL_WANT) { 265 fdcache_lock &= ~FDL_WANT; 266 wakeup(&fdcache_lock); 267 } 268 269 return (error); 270 } 271 272 /* 273 * vp is the current namei directory 274 * ndp is the name to locate in that directory... 275 */ 276 int 277 fdesc_lookup(v) 278 void *v; 279 { 280 struct vop_lookup_args /* { 281 struct vnode * a_dvp; 282 struct vnode ** a_vpp; 283 struct componentname * a_cnp; 284 } */ *ap = v; 285 struct vnode **vpp = ap->a_vpp; 286 struct vnode *dvp = ap->a_dvp; 287 struct componentname *cnp = ap->a_cnp; 288 struct lwp *l = cnp->cn_lwp; 289 const char *pname = cnp->cn_nameptr; 290 struct proc *p; 291 int nfiles; 292 unsigned fd = 0; 293 int error; 294 struct vnode *fvp; 295 char *ln; 296 297 if (cnp->cn_namelen == 1 && *pname == '.') { 298 *vpp = dvp; 299 VREF(dvp); 300 return (0); 301 } 302 303 p = l->l_proc; 304 nfiles = p->p_fd->fd_nfiles; 305 306 switch (VTOFDESC(dvp)->fd_type) { 307 default: 308 case Flink: 309 case Fdesc: 310 case Fctty: 311 error = ENOTDIR; 312 goto bad; 313 314 case Froot: 315 if (cnp->cn_namelen == 2 && memcmp(pname, "fd", 2) == 0) { 316 error = fdesc_allocvp(Fdevfd, FD_DEVFD, dvp->v_mount, &fvp); 317 if (error) 318 goto bad; 319 *vpp = fvp; 320 fvp->v_type = VDIR; 321 goto good; 322 } 323 324 if (cnp->cn_namelen == 3 && memcmp(pname, "tty", 3) == 0) { 325 struct vnode *ttyvp = cttyvp(p); 326 if (ttyvp == NULL) { 327 error = ENXIO; 328 goto bad; 329 } 330 error = fdesc_allocvp(Fctty, FD_CTTY, dvp->v_mount, &fvp); 331 if (error) 332 goto bad; 333 *vpp = fvp; 334 fvp->v_type = VCHR; 335 goto good; 336 } 337 338 ln = 0; 339 switch (cnp->cn_namelen) { 340 case 5: 341 if (memcmp(pname, "stdin", 5) == 0) { 342 ln = "fd/0"; 343 fd = FD_STDIN; 344 } 345 break; 346 case 6: 347 if (memcmp(pname, "stdout", 6) == 0) { 348 ln = "fd/1"; 349 fd = FD_STDOUT; 350 } else 351 if (memcmp(pname, "stderr", 6) == 0) { 352 ln = "fd/2"; 353 fd = FD_STDERR; 354 } 355 break; 356 } 357 358 if (ln) { 359 error = fdesc_allocvp(Flink, fd, dvp->v_mount, &fvp); 360 if (error) 361 goto bad; 362 VTOFDESC(fvp)->fd_link = ln; 363 *vpp = fvp; 364 fvp->v_type = VLNK; 365 goto good; 366 } else { 367 error = ENOENT; 368 goto bad; 369 } 370 371 /* FALL THROUGH */ 372 373 case Fdevfd: 374 if (cnp->cn_namelen == 2 && memcmp(pname, "..", 2) == 0) { 375 VOP_UNLOCK(dvp, 0); 376 cnp->cn_flags |= PDIRUNLOCK; 377 error = fdesc_root(dvp->v_mount, vpp); 378 if (error) 379 goto bad; 380 /* 381 * If we're at the last component and need the 382 * parent locked, undo the unlock above. 383 */ 384 if (((~cnp->cn_flags & (ISLASTCN | LOCKPARENT)) == 0) && 385 ((error = vn_lock(dvp, LK_EXCLUSIVE)) == 0)) 386 cnp->cn_flags &= ~PDIRUNLOCK; 387 return (error); 388 } 389 390 fd = 0; 391 while (*pname >= '0' && *pname <= '9') { 392 fd = 10 * fd + *pname++ - '0'; 393 if (fd >= nfiles) 394 break; 395 } 396 397 if (*pname != '\0') { 398 error = ENOENT; 399 goto bad; 400 } 401 402 if (fd >= nfiles || p->p_fd->fd_ofiles[fd] == NULL || 403 FILE_IS_USABLE(p->p_fd->fd_ofiles[fd]) == 0) { 404 error = EBADF; 405 goto bad; 406 } 407 408 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp); 409 if (error) 410 goto bad; 411 VTOFDESC(fvp)->fd_fd = fd; 412 *vpp = fvp; 413 goto good; 414 } 415 416 bad:; 417 *vpp = NULL; 418 return (error); 419 420 good:; 421 /* 422 * As "." was special cased above, we now unlock the parent if we're 423 * suppoed to. We're only supposed to not unlock if this is the 424 * last component, and the caller requested LOCKPARENT. So if either 425 * condition is false, unlock. 426 */ 427 if (((~cnp->cn_flags) & (ISLASTCN | LOCKPARENT)) != 0) { 428 VOP_UNLOCK(dvp, 0); 429 cnp->cn_flags |= PDIRUNLOCK; 430 } 431 return (0); 432 } 433 434 int 435 fdesc_open(v) 436 void *v; 437 { 438 struct vop_open_args /* { 439 struct vnode *a_vp; 440 int a_mode; 441 struct ucred *a_cred; 442 struct lwp *a_l; 443 } */ *ap = v; 444 struct vnode *vp = ap->a_vp; 445 446 switch (VTOFDESC(vp)->fd_type) { 447 case Fdesc: 448 /* 449 * XXX Kludge: set dupfd to contain the value of the 450 * the file descriptor being sought for duplication. The error 451 * return ensures that the vnode for this device will be 452 * released by vn_open. Open will detect this special error and 453 * take the actions in dupfdopen. Other callers of vn_open or 454 * VOP_OPEN will simply report the error. 455 */ 456 curlwp->l_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */ 457 return (ENODEV); 458 459 case Fctty: 460 return ((*ctty_cdevsw.d_open)(devctty, ap->a_mode, 0, ap->a_l)); 461 case Froot: 462 case Fdevfd: 463 case Flink: 464 break; 465 } 466 467 return (0); 468 } 469 470 static int 471 fdesc_attr(fd, vap, cred, l) 472 int fd; 473 struct vattr *vap; 474 struct ucred *cred; 475 struct lwp *l; 476 { 477 struct proc *p = l->l_proc; 478 struct filedesc *fdp = p->p_fd; 479 struct file *fp; 480 struct stat stb; 481 int error; 482 483 if ((fp = fd_getfile(fdp, fd)) == NULL) 484 return (EBADF); 485 486 switch (fp->f_type) { 487 case DTYPE_VNODE: 488 simple_unlock(&fp->f_slock); 489 error = VOP_GETATTR((struct vnode *) fp->f_data, vap, cred, l); 490 if (error == 0 && vap->va_type == VDIR) { 491 /* 492 * directories can cause loops in the namespace, 493 * so turn off the 'x' bits to avoid trouble. 494 */ 495 vap->va_mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH); 496 } 497 break; 498 499 default: 500 FILE_USE(fp); 501 memset(&stb, 0, sizeof(stb)); 502 error = (*fp->f_ops->fo_stat)(fp, &stb, l); 503 FILE_UNUSE(fp, l); 504 if (error) 505 break; 506 507 vattr_null(vap); 508 switch(fp->f_type) { 509 case DTYPE_SOCKET: 510 vap->va_type = VSOCK; 511 break; 512 case DTYPE_PIPE: 513 vap->va_type = VFIFO; 514 break; 515 default: 516 /* use VNON perhaps? */ 517 vap->va_type = VBAD; 518 break; 519 } 520 vap->va_mode = stb.st_mode; 521 vap->va_nlink = stb.st_nlink; 522 vap->va_uid = stb.st_uid; 523 vap->va_gid = stb.st_gid; 524 vap->va_fsid = stb.st_dev; 525 vap->va_fileid = stb.st_ino; 526 vap->va_size = stb.st_size; 527 vap->va_blocksize = stb.st_blksize; 528 vap->va_atime = stb.st_atimespec; 529 vap->va_mtime = stb.st_mtimespec; 530 vap->va_ctime = stb.st_ctimespec; 531 vap->va_gen = stb.st_gen; 532 vap->va_flags = stb.st_flags; 533 vap->va_rdev = stb.st_rdev; 534 vap->va_bytes = stb.st_blocks * stb.st_blksize; 535 break; 536 } 537 538 return (error); 539 } 540 541 int 542 fdesc_getattr(v) 543 void *v; 544 { 545 struct vop_getattr_args /* { 546 struct vnode *a_vp; 547 struct vattr *a_vap; 548 struct ucred *a_cred; 549 struct lwp *a_l; 550 } */ *ap = v; 551 struct vnode *vp = ap->a_vp; 552 struct vattr *vap = ap->a_vap; 553 unsigned fd; 554 int error = 0; 555 556 switch (VTOFDESC(vp)->fd_type) { 557 case Froot: 558 case Fdevfd: 559 case Flink: 560 case Fctty: 561 VATTR_NULL(vap); 562 vap->va_fileid = VTOFDESC(vp)->fd_ix; 563 564 #define R_ALL (S_IRUSR|S_IRGRP|S_IROTH) 565 #define W_ALL (S_IWUSR|S_IWGRP|S_IWOTH) 566 #define X_ALL (S_IXUSR|S_IXGRP|S_IXOTH) 567 568 switch (VTOFDESC(vp)->fd_type) { 569 case Flink: 570 vap->va_mode = R_ALL|X_ALL; 571 vap->va_type = VLNK; 572 vap->va_rdev = 0; 573 vap->va_nlink = 1; 574 vap->va_size = strlen(VTOFDESC(vp)->fd_link); 575 break; 576 577 case Fctty: 578 vap->va_mode = R_ALL|W_ALL; 579 vap->va_type = VCHR; 580 vap->va_rdev = devctty; 581 vap->va_nlink = 1; 582 vap->va_size = 0; 583 break; 584 585 default: 586 vap->va_mode = R_ALL|X_ALL; 587 vap->va_type = VDIR; 588 vap->va_rdev = 0; 589 vap->va_nlink = 2; 590 vap->va_size = DEV_BSIZE; 591 break; 592 } 593 vap->va_uid = 0; 594 vap->va_gid = 0; 595 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 596 vap->va_blocksize = DEV_BSIZE; 597 vap->va_atime.tv_sec = boottime.tv_sec; 598 vap->va_atime.tv_nsec = 0; 599 vap->va_mtime = vap->va_atime; 600 vap->va_ctime = vap->va_mtime; 601 vap->va_gen = 0; 602 vap->va_flags = 0; 603 vap->va_bytes = 0; 604 break; 605 606 case Fdesc: 607 fd = VTOFDESC(vp)->fd_fd; 608 error = fdesc_attr(fd, vap, ap->a_cred, ap->a_l); 609 break; 610 611 default: 612 panic("fdesc_getattr"); 613 break; 614 } 615 616 if (error == 0) 617 vp->v_type = vap->va_type; 618 619 return (error); 620 } 621 622 int 623 fdesc_setattr(v) 624 void *v; 625 { 626 struct vop_setattr_args /* { 627 struct vnode *a_vp; 628 struct vattr *a_vap; 629 struct ucred *a_cred; 630 struct lwp *a_l; 631 } */ *ap = v; 632 struct filedesc *fdp = ap->a_l->l_proc->p_fd; 633 struct file *fp; 634 unsigned fd; 635 636 /* 637 * Can't mess with the root vnode 638 */ 639 switch (VTOFDESC(ap->a_vp)->fd_type) { 640 case Fdesc: 641 break; 642 643 case Fctty: 644 return (0); 645 646 default: 647 return (EACCES); 648 } 649 650 fd = VTOFDESC(ap->a_vp)->fd_fd; 651 if ((fp = fd_getfile(fdp, fd)) == NULL) 652 return (EBADF); 653 654 /* 655 * XXX: Can't reasonably set the attr's on any types currently. 656 * On vnode's this will cause truncation and socket/pipes make 657 * no sense. 658 */ 659 simple_unlock(&fp->f_slock); 660 return (0); 661 } 662 663 #define UIO_MX 32 664 665 struct fdesc_target { 666 ino_t ft_fileno; 667 u_char ft_type; 668 u_char ft_namlen; 669 char *ft_name; 670 } fdesc_targets[] = { 671 /* NOTE: The name must be less than UIO_MX-16 chars in length */ 672 #define N(s) sizeof(s)-1, s 673 { FD_DEVFD, DT_DIR, N("fd") }, 674 { FD_STDIN, DT_LNK, N("stdin") }, 675 { FD_STDOUT, DT_LNK, N("stdout") }, 676 { FD_STDERR, DT_LNK, N("stderr") }, 677 { FD_CTTY, DT_UNKNOWN, N("tty") }, 678 #undef N 679 }; 680 static int nfdesc_targets = sizeof(fdesc_targets) / sizeof(fdesc_targets[0]); 681 682 int 683 fdesc_readdir(v) 684 void *v; 685 { 686 struct vop_readdir_args /* { 687 struct vnode *a_vp; 688 struct uio *a_uio; 689 struct ucred *a_cred; 690 int *a_eofflag; 691 off_t **a_cookies; 692 int *a_ncookies; 693 } */ *ap = v; 694 struct uio *uio = ap->a_uio; 695 struct dirent d; 696 struct filedesc *fdp; 697 off_t i; 698 int error; 699 off_t *cookies = NULL; 700 int ncookies = 0; 701 702 switch (VTOFDESC(ap->a_vp)->fd_type) { 703 case Fctty: 704 return (0); 705 706 case Fdesc: 707 return (ENOTDIR); 708 709 default: 710 break; 711 } 712 713 fdp = uio->uio_lwp->l_proc->p_fd; 714 715 if (uio->uio_resid < UIO_MX) 716 return (EINVAL); 717 if (uio->uio_offset < 0) 718 return (EINVAL); 719 720 error = 0; 721 i = uio->uio_offset; 722 memset(&d, 0, UIO_MX); 723 d.d_reclen = UIO_MX; 724 if (ap->a_ncookies) 725 ncookies = (uio->uio_resid / UIO_MX); 726 727 if (VTOFDESC(ap->a_vp)->fd_type == Froot) { 728 struct fdesc_target *ft; 729 730 if (i >= nfdesc_targets) 731 return 0; 732 733 if (ap->a_ncookies) { 734 ncookies = min(ncookies, (nfdesc_targets - i)); 735 cookies = malloc(ncookies * sizeof(off_t), 736 M_TEMP, M_WAITOK); 737 *ap->a_cookies = cookies; 738 *ap->a_ncookies = ncookies; 739 } 740 741 for (ft = &fdesc_targets[i]; 742 uio->uio_resid >= UIO_MX && i < nfdesc_targets; ft++, i++) { 743 switch (ft->ft_fileno) { 744 case FD_CTTY: 745 if (cttyvp(uio->uio_lwp->l_proc) == NULL) 746 continue; 747 break; 748 749 case FD_STDIN: 750 case FD_STDOUT: 751 case FD_STDERR: 752 if ((ft->ft_fileno - FD_STDIN) >= fdp->fd_nfiles) 753 continue; 754 if (fdp->fd_ofiles[ft->ft_fileno - FD_STDIN] == NULL 755 || FILE_IS_USABLE(fdp->fd_ofiles[ft->ft_fileno - FD_STDIN]) == 0) 756 continue; 757 break; 758 } 759 760 d.d_fileno = ft->ft_fileno; 761 d.d_namlen = ft->ft_namlen; 762 memcpy(d.d_name, ft->ft_name, ft->ft_namlen + 1); 763 d.d_type = ft->ft_type; 764 765 if ((error = uiomove(&d, UIO_MX, uio)) != 0) 766 break; 767 if (cookies) 768 *cookies++ = i + 1; 769 } 770 } else { 771 if (ap->a_ncookies) { 772 ncookies = min(ncookies, (fdp->fd_nfiles + 2)); 773 cookies = malloc(ncookies * sizeof(off_t), 774 M_TEMP, M_WAITOK); 775 *ap->a_cookies = cookies; 776 *ap->a_ncookies = ncookies; 777 } 778 for (; i - 2 < fdp->fd_nfiles && uio->uio_resid >= UIO_MX; 779 i++) { 780 switch (i) { 781 case 0: 782 case 1: 783 d.d_fileno = FD_ROOT; /* XXX */ 784 d.d_namlen = i + 1; 785 memcpy(d.d_name, "..", d.d_namlen); 786 d.d_name[i + 1] = '\0'; 787 d.d_type = DT_DIR; 788 break; 789 790 default: 791 if (fdp->fd_ofiles[i - 2] == NULL || 792 FILE_IS_USABLE(fdp->fd_ofiles[i - 2]) == 0) 793 continue; 794 d.d_fileno = i - 2 + FD_STDIN; 795 d.d_namlen = sprintf(d.d_name, "%d", (int) i - 2); 796 d.d_type = DT_UNKNOWN; 797 break; 798 } 799 800 if ((error = uiomove(&d, UIO_MX, uio)) != 0) 801 break; 802 if (cookies) 803 *cookies++ = i + 1; 804 } 805 } 806 807 if (ap->a_ncookies && error) { 808 free(*ap->a_cookies, M_TEMP); 809 *ap->a_ncookies = 0; 810 *ap->a_cookies = NULL; 811 } 812 813 uio->uio_offset = i; 814 return (error); 815 } 816 817 int 818 fdesc_readlink(v) 819 void *v; 820 { 821 struct vop_readlink_args /* { 822 struct vnode *a_vp; 823 struct uio *a_uio; 824 struct ucred *a_cred; 825 } */ *ap = v; 826 struct vnode *vp = ap->a_vp; 827 int error; 828 829 if (vp->v_type != VLNK) 830 return (EPERM); 831 832 if (VTOFDESC(vp)->fd_type == Flink) { 833 char *ln = VTOFDESC(vp)->fd_link; 834 error = uiomove(ln, strlen(ln), ap->a_uio); 835 } else { 836 error = EOPNOTSUPP; 837 } 838 839 return (error); 840 } 841 842 int 843 fdesc_read(v) 844 void *v; 845 { 846 struct vop_read_args /* { 847 struct vnode *a_vp; 848 struct uio *a_uio; 849 int a_ioflag; 850 struct ucred *a_cred; 851 } */ *ap = v; 852 int error = EOPNOTSUPP; 853 struct vnode *vp = ap->a_vp; 854 855 switch (VTOFDESC(vp)->fd_type) { 856 case Fctty: 857 VOP_UNLOCK(vp, 0); 858 error = (*ctty_cdevsw.d_read)(devctty, ap->a_uio, ap->a_ioflag); 859 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 860 break; 861 862 default: 863 error = EOPNOTSUPP; 864 break; 865 } 866 867 return (error); 868 } 869 870 int 871 fdesc_write(v) 872 void *v; 873 { 874 struct vop_write_args /* { 875 struct vnode *a_vp; 876 struct uio *a_uio; 877 int a_ioflag; 878 struct ucred *a_cred; 879 } */ *ap = v; 880 int error = EOPNOTSUPP; 881 struct vnode *vp = ap->a_vp; 882 883 switch (VTOFDESC(vp)->fd_type) { 884 case Fctty: 885 VOP_UNLOCK(vp, 0); 886 error = (*ctty_cdevsw.d_write)(devctty, ap->a_uio, 887 ap->a_ioflag); 888 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 889 break; 890 891 default: 892 error = EOPNOTSUPP; 893 break; 894 } 895 896 return (error); 897 } 898 899 int 900 fdesc_ioctl(v) 901 void *v; 902 { 903 struct vop_ioctl_args /* { 904 struct vnode *a_vp; 905 u_long a_command; 906 void *a_data; 907 int a_fflag; 908 struct ucred *a_cred; 909 struct lwp *a_l; 910 } */ *ap = v; 911 int error = EOPNOTSUPP; 912 913 switch (VTOFDESC(ap->a_vp)->fd_type) { 914 case Fctty: 915 error = (*ctty_cdevsw.d_ioctl)(devctty, ap->a_command, 916 ap->a_data, ap->a_fflag, 917 ap->a_l); 918 break; 919 920 default: 921 error = EOPNOTSUPP; 922 break; 923 } 924 925 return (error); 926 } 927 928 int 929 fdesc_poll(v) 930 void *v; 931 { 932 struct vop_poll_args /* { 933 struct vnode *a_vp; 934 int a_events; 935 struct lwp *a_l; 936 } */ *ap = v; 937 int revents; 938 939 switch (VTOFDESC(ap->a_vp)->fd_type) { 940 case Fctty: 941 revents = (*ctty_cdevsw.d_poll)(devctty, ap->a_events, ap->a_l); 942 break; 943 944 default: 945 revents = genfs_poll(v); 946 break; 947 } 948 949 return (revents); 950 } 951 952 int 953 fdesc_kqfilter(v) 954 void *v; 955 { 956 struct vop_kqfilter_args /* { 957 struct vnode *a_vp; 958 struct knote *a_kn; 959 } */ *ap = v; 960 int error; 961 struct proc *p; 962 struct lwp *l; 963 struct file *fp; 964 965 switch (VTOFDESC(ap->a_vp)->fd_type) { 966 case Fctty: 967 error = (*ctty_cdevsw.d_kqfilter)(devctty, ap->a_kn); 968 break; 969 970 case Fdesc: 971 /* just invoke kqfilter for the underlying descriptor */ 972 l = curlwp; /* XXX hopefully ok to use curproc here */ 973 p = l->l_proc; 974 if ((fp = fd_getfile(p->p_fd, VTOFDESC(ap->a_vp)->fd_fd)) == NULL) 975 return (1); 976 977 FILE_USE(fp); 978 error = (*fp->f_ops->fo_kqfilter)(fp, ap->a_kn); 979 FILE_UNUSE(fp, l); 980 break; 981 982 default: 983 return (genfs_kqfilter(v)); 984 } 985 986 return (error); 987 } 988 989 int 990 fdesc_inactive(v) 991 void *v; 992 { 993 struct vop_inactive_args /* { 994 struct vnode *a_vp; 995 struct lwp *a_l; 996 } */ *ap = v; 997 struct vnode *vp = ap->a_vp; 998 999 /* 1000 * Clear out the v_type field to avoid 1001 * nasty things happening in vgone(). 1002 */ 1003 VOP_UNLOCK(vp, 0); 1004 vp->v_type = VNON; 1005 return (0); 1006 } 1007 1008 int 1009 fdesc_reclaim(v) 1010 void *v; 1011 { 1012 struct vop_reclaim_args /* { 1013 struct vnode *a_vp; 1014 } */ *ap = v; 1015 struct vnode *vp = ap->a_vp; 1016 struct fdescnode *fd = VTOFDESC(vp); 1017 1018 LIST_REMOVE(fd, fd_hash); 1019 FREE(vp->v_data, M_TEMP); 1020 vp->v_data = 0; 1021 1022 return (0); 1023 } 1024 1025 /* 1026 * Return POSIX pathconf information applicable to special devices. 1027 */ 1028 int 1029 fdesc_pathconf(v) 1030 void *v; 1031 { 1032 struct vop_pathconf_args /* { 1033 struct vnode *a_vp; 1034 int a_name; 1035 register_t *a_retval; 1036 } */ *ap = v; 1037 1038 switch (ap->a_name) { 1039 case _PC_LINK_MAX: 1040 *ap->a_retval = LINK_MAX; 1041 return (0); 1042 case _PC_MAX_CANON: 1043 *ap->a_retval = MAX_CANON; 1044 return (0); 1045 case _PC_MAX_INPUT: 1046 *ap->a_retval = MAX_INPUT; 1047 return (0); 1048 case _PC_PIPE_BUF: 1049 *ap->a_retval = PIPE_BUF; 1050 return (0); 1051 case _PC_CHOWN_RESTRICTED: 1052 *ap->a_retval = 1; 1053 return (0); 1054 case _PC_VDISABLE: 1055 *ap->a_retval = _POSIX_VDISABLE; 1056 return (0); 1057 case _PC_SYNC_IO: 1058 *ap->a_retval = 1; 1059 return (0); 1060 default: 1061 return (EINVAL); 1062 } 1063 /* NOTREACHED */ 1064 } 1065 1066 /* 1067 * Print out the contents of a /dev/fd vnode. 1068 */ 1069 /* ARGSUSED */ 1070 int 1071 fdesc_print(v) 1072 void *v; 1073 { 1074 printf("tag VT_NON, fdesc vnode\n"); 1075 return (0); 1076 } 1077 1078 int 1079 fdesc_link(v) 1080 void *v; 1081 { 1082 struct vop_link_args /* { 1083 struct vnode *a_dvp; 1084 struct vnode *a_vp; 1085 struct componentname *a_cnp; 1086 } */ *ap = v; 1087 1088 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 1089 vput(ap->a_dvp); 1090 return (EROFS); 1091 } 1092 1093 int 1094 fdesc_symlink(v) 1095 void *v; 1096 { 1097 struct vop_symlink_args /* { 1098 struct vnode *a_dvp; 1099 struct vnode **a_vpp; 1100 struct componentname *a_cnp; 1101 struct vattr *a_vap; 1102 char *a_target; 1103 } */ *ap = v; 1104 1105 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 1106 vput(ap->a_dvp); 1107 return (EROFS); 1108 } 1109
Indexes created Wed Oct 22 13:09:56 GMT 2025