spec_vnops.c revision 1.62
1 /* $NetBSD: spec_vnops.c,v 1.62 2002/07/10 23:16:33 wiz Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)spec_vnops.c 8.15 (Berkeley) 7/14/95 36 */ 37 38 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: spec_vnops.c,v 1.62 2002/07/10 23:16:33 wiz Exp $"); 40 41 #include <sys/param.h> 42 #include <sys/proc.h> 43 #include <sys/systm.h> 44 #include <sys/kernel.h> 45 #include <sys/conf.h> 46 #include <sys/buf.h> 47 #include <sys/mount.h> 48 #include <sys/namei.h> 49 #include <sys/vnode.h> 50 #include <sys/stat.h> 51 #include <sys/errno.h> 52 #include <sys/ioctl.h> 53 #include <sys/file.h> 54 #include <sys/disklabel.h> 55 #include <sys/lockf.h> 56 57 #include <miscfs/genfs/genfs.h> 58 #include <miscfs/specfs/specdev.h> 59 60 /* symbolic sleep message strings for devices */ 61 const char devopn[] = "devopn"; 62 const char devio[] = "devio"; 63 const char devwait[] = "devwait"; 64 const char devin[] = "devin"; 65 const char devout[] = "devout"; 66 const char devioc[] = "devioc"; 67 const char devcls[] = "devcls"; 68 69 struct vnode *speclisth[SPECHSZ]; 70 71 /* 72 * This vnode operations vector is used for two things only: 73 * - special device nodes created from whole cloth by the kernel. 74 * - as a temporary vnodeops replacement for vnodes which were found to 75 * be aliased by callers of checkalias(). 76 * For the ops vector for vnodes built from special devices found in a 77 * filesystem, see (e.g) ffs_specop_entries[] in ffs_vnops.c or the 78 * equivalent for other filesystems. 79 */ 80 81 int (**spec_vnodeop_p) __P((void *)); 82 const struct vnodeopv_entry_desc spec_vnodeop_entries[] = { 83 { &vop_default_desc, vn_default_error }, 84 { &vop_lookup_desc, spec_lookup }, /* lookup */ 85 { &vop_create_desc, spec_create }, /* create */ 86 { &vop_mknod_desc, spec_mknod }, /* mknod */ 87 { &vop_open_desc, spec_open }, /* open */ 88 { &vop_close_desc, spec_close }, /* close */ 89 { &vop_access_desc, spec_access }, /* access */ 90 { &vop_getattr_desc, spec_getattr }, /* getattr */ 91 { &vop_setattr_desc, spec_setattr }, /* setattr */ 92 { &vop_read_desc, spec_read }, /* read */ 93 { &vop_write_desc, spec_write }, /* write */ 94 { &vop_lease_desc, spec_lease_check }, /* lease */ 95 { &vop_fcntl_desc, spec_fcntl }, /* fcntl */ 96 { &vop_ioctl_desc, spec_ioctl }, /* ioctl */ 97 { &vop_poll_desc, spec_poll }, /* poll */ 98 { &vop_revoke_desc, spec_revoke }, /* revoke */ 99 { &vop_mmap_desc, spec_mmap }, /* mmap */ 100 { &vop_fsync_desc, spec_fsync }, /* fsync */ 101 { &vop_seek_desc, spec_seek }, /* seek */ 102 { &vop_remove_desc, spec_remove }, /* remove */ 103 { &vop_link_desc, spec_link }, /* link */ 104 { &vop_rename_desc, spec_rename }, /* rename */ 105 { &vop_mkdir_desc, spec_mkdir }, /* mkdir */ 106 { &vop_rmdir_desc, spec_rmdir }, /* rmdir */ 107 { &vop_symlink_desc, spec_symlink }, /* symlink */ 108 { &vop_readdir_desc, spec_readdir }, /* readdir */ 109 { &vop_readlink_desc, spec_readlink }, /* readlink */ 110 { &vop_abortop_desc, spec_abortop }, /* abortop */ 111 { &vop_inactive_desc, spec_inactive }, /* inactive */ 112 { &vop_reclaim_desc, spec_reclaim }, /* reclaim */ 113 { &vop_lock_desc, spec_lock }, /* lock */ 114 { &vop_unlock_desc, spec_unlock }, /* unlock */ 115 { &vop_bmap_desc, spec_bmap }, /* bmap */ 116 { &vop_strategy_desc, spec_strategy }, /* strategy */ 117 { &vop_print_desc, spec_print }, /* print */ 118 { &vop_islocked_desc, spec_islocked }, /* islocked */ 119 { &vop_pathconf_desc, spec_pathconf }, /* pathconf */ 120 { &vop_advlock_desc, spec_advlock }, /* advlock */ 121 { &vop_blkatoff_desc, spec_blkatoff }, /* blkatoff */ 122 { &vop_valloc_desc, spec_valloc }, /* valloc */ 123 { &vop_vfree_desc, spec_vfree }, /* vfree */ 124 { &vop_truncate_desc, spec_truncate }, /* truncate */ 125 { &vop_update_desc, spec_update }, /* update */ 126 { &vop_bwrite_desc, spec_bwrite }, /* bwrite */ 127 { &vop_getpages_desc, spec_getpages }, /* getpages */ 128 { &vop_putpages_desc, spec_putpages }, /* putpages */ 129 { NULL, NULL } 130 }; 131 const struct vnodeopv_desc spec_vnodeop_opv_desc = 132 { &spec_vnodeop_p, spec_vnodeop_entries }; 133 134 /* 135 * Trivial lookup routine that always fails. 136 */ 137 int 138 spec_lookup(v) 139 void *v; 140 { 141 struct vop_lookup_args /* { 142 struct vnode *a_dvp; 143 struct vnode **a_vpp; 144 struct componentname *a_cnp; 145 } */ *ap = v; 146 147 *ap->a_vpp = NULL; 148 return (ENOTDIR); 149 } 150 151 /* 152 * Open a special file. 153 */ 154 /* ARGSUSED */ 155 int 156 spec_open(v) 157 void *v; 158 { 159 struct vop_open_args /* { 160 struct vnode *a_vp; 161 int a_mode; 162 struct ucred *a_cred; 163 struct proc *a_p; 164 } */ *ap = v; 165 struct proc *p = ap->a_p; 166 struct vnode *bvp, *vp = ap->a_vp; 167 dev_t bdev, dev = (dev_t)vp->v_rdev; 168 int maj = major(dev); 169 int error; 170 struct partinfo pi; 171 172 /* 173 * Don't allow open if fs is mounted -nodev. 174 */ 175 if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_NODEV)) 176 return (ENXIO); 177 178 switch (vp->v_type) { 179 180 case VCHR: 181 if ((u_int)maj >= nchrdev) 182 return (ENXIO); 183 if (ap->a_cred != FSCRED && (ap->a_mode & FWRITE)) { 184 /* 185 * When running in very secure mode, do not allow 186 * opens for writing of any disk character devices. 187 */ 188 if (securelevel >= 2 && cdevsw[maj].d_type == D_DISK) 189 return (EPERM); 190 /* 191 * When running in secure mode, do not allow opens 192 * for writing of /dev/mem, /dev/kmem, or character 193 * devices whose corresponding block devices are 194 * currently mounted. 195 */ 196 if (securelevel >= 1) { 197 if ((bdev = chrtoblk(dev)) != (dev_t)NODEV && 198 vfinddev(bdev, VBLK, &bvp) && 199 (error = vfs_mountedon(bvp))) 200 return (error); 201 if (iskmemdev(dev)) 202 return (EPERM); 203 } 204 } 205 if (cdevsw[maj].d_type == D_TTY) 206 vp->v_flag |= VISTTY; 207 VOP_UNLOCK(vp, 0); 208 error = (*cdevsw[maj].d_open)(dev, ap->a_mode, S_IFCHR, p); 209 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 210 return (error); 211 212 case VBLK: 213 if ((u_int)maj >= nblkdev) 214 return (ENXIO); 215 /* 216 * When running in very secure mode, do not allow 217 * opens for writing of any disk block devices. 218 */ 219 if (securelevel >= 2 && ap->a_cred != FSCRED && 220 (ap->a_mode & FWRITE) && bdevsw[maj].d_type == D_DISK) 221 return (EPERM); 222 /* 223 * Do not allow opens of block devices that are 224 * currently mounted. 225 */ 226 if ((error = vfs_mountedon(vp)) != 0) 227 return (error); 228 error = (*bdevsw[maj].d_open)(dev, ap->a_mode, S_IFBLK, p); 229 if (error) { 230 return error; 231 } 232 error = (*bdevsw[major(vp->v_rdev)].d_ioctl)(vp->v_rdev, 233 DIOCGPART, (caddr_t)&pi, FREAD, curproc); 234 if (error == 0) { 235 vp->v_size = (voff_t)pi.disklab->d_secsize * 236 pi.part->p_size; 237 } 238 return 0; 239 240 case VNON: 241 case VLNK: 242 case VDIR: 243 case VREG: 244 case VBAD: 245 case VFIFO: 246 case VSOCK: 247 break; 248 } 249 return (0); 250 } 251 252 /* 253 * Vnode op for read 254 */ 255 /* ARGSUSED */ 256 int 257 spec_read(v) 258 void *v; 259 { 260 struct vop_read_args /* { 261 struct vnode *a_vp; 262 struct uio *a_uio; 263 int a_ioflag; 264 struct ucred *a_cred; 265 } */ *ap = v; 266 struct vnode *vp = ap->a_vp; 267 struct uio *uio = ap->a_uio; 268 struct proc *p = uio->uio_procp; 269 struct buf *bp; 270 daddr_t bn; 271 int bsize, bscale; 272 struct partinfo dpart; 273 int n, on, majordev; 274 int (*ioctl) __P((dev_t, u_long, caddr_t, int, struct proc *)); 275 int error = 0; 276 277 #ifdef DIAGNOSTIC 278 if (uio->uio_rw != UIO_READ) 279 panic("spec_read mode"); 280 if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc) 281 panic("spec_read proc"); 282 #endif 283 if (uio->uio_resid == 0) 284 return (0); 285 286 switch (vp->v_type) { 287 288 case VCHR: 289 VOP_UNLOCK(vp, 0); 290 error = (*cdevsw[major(vp->v_rdev)].d_read) 291 (vp->v_rdev, uio, ap->a_ioflag); 292 vn_lock(vp, LK_SHARED | LK_RETRY); 293 return (error); 294 295 case VBLK: 296 if (uio->uio_offset < 0) 297 return (EINVAL); 298 bsize = BLKDEV_IOSIZE; 299 if ((majordev = major(vp->v_rdev)) < nblkdev && 300 (ioctl = bdevsw[majordev].d_ioctl) != NULL && 301 (*ioctl)(vp->v_rdev, DIOCGPART, (caddr_t)&dpart, FREAD, p) == 0) { 302 if (dpart.part->p_fstype == FS_BSDFFS && 303 dpart.part->p_frag != 0 && dpart.part->p_fsize != 0) 304 bsize = dpart.part->p_frag * 305 dpart.part->p_fsize; 306 } 307 bscale = bsize >> DEV_BSHIFT; 308 do { 309 bn = (uio->uio_offset >> DEV_BSHIFT) &~ (bscale - 1); 310 on = uio->uio_offset % bsize; 311 n = min((unsigned)(bsize - on), uio->uio_resid); 312 error = bread(vp, bn, bsize, NOCRED, &bp); 313 n = min(n, bsize - bp->b_resid); 314 if (error) { 315 brelse(bp); 316 return (error); 317 } 318 error = uiomove((char *)bp->b_data + on, n, uio); 319 brelse(bp); 320 } while (error == 0 && uio->uio_resid > 0 && n != 0); 321 return (error); 322 323 default: 324 panic("spec_read type"); 325 } 326 /* NOTREACHED */ 327 } 328 329 /* 330 * Vnode op for write 331 */ 332 /* ARGSUSED */ 333 int 334 spec_write(v) 335 void *v; 336 { 337 struct vop_write_args /* { 338 struct vnode *a_vp; 339 struct uio *a_uio; 340 int a_ioflag; 341 struct ucred *a_cred; 342 } */ *ap = v; 343 struct vnode *vp = ap->a_vp; 344 struct uio *uio = ap->a_uio; 345 struct proc *p = uio->uio_procp; 346 struct buf *bp; 347 daddr_t bn; 348 int bsize, bscale; 349 struct partinfo dpart; 350 int n, on, majordev; 351 int (*ioctl) __P((dev_t, u_long, caddr_t, int, struct proc *)); 352 int error = 0; 353 354 #ifdef DIAGNOSTIC 355 if (uio->uio_rw != UIO_WRITE) 356 panic("spec_write mode"); 357 if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc) 358 panic("spec_write proc"); 359 #endif 360 361 switch (vp->v_type) { 362 363 case VCHR: 364 VOP_UNLOCK(vp, 0); 365 error = (*cdevsw[major(vp->v_rdev)].d_write) 366 (vp->v_rdev, uio, ap->a_ioflag); 367 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 368 return (error); 369 370 case VBLK: 371 if (uio->uio_resid == 0) 372 return (0); 373 if (uio->uio_offset < 0) 374 return (EINVAL); 375 bsize = BLKDEV_IOSIZE; 376 if ((majordev = major(vp->v_rdev)) < nblkdev && 377 (ioctl = bdevsw[majordev].d_ioctl) != NULL && 378 (*ioctl)(vp->v_rdev, DIOCGPART, (caddr_t)&dpart, FREAD, p) == 0) { 379 if (dpart.part->p_fstype == FS_BSDFFS && 380 dpart.part->p_frag != 0 && dpart.part->p_fsize != 0) 381 bsize = dpart.part->p_frag * 382 dpart.part->p_fsize; 383 } 384 bscale = bsize >> DEV_BSHIFT; 385 do { 386 bn = (uio->uio_offset >> DEV_BSHIFT) &~ (bscale - 1); 387 on = uio->uio_offset % bsize; 388 n = min((unsigned)(bsize - on), uio->uio_resid); 389 if (n == bsize) 390 bp = getblk(vp, bn, bsize, 0, 0); 391 else 392 error = bread(vp, bn, bsize, NOCRED, &bp); 393 if (error) { 394 brelse(bp); 395 return (error); 396 } 397 n = min(n, bsize - bp->b_resid); 398 error = uiomove((char *)bp->b_data + on, n, uio); 399 if (error) 400 brelse(bp); 401 else { 402 if (n + on == bsize) 403 bawrite(bp); 404 else 405 bdwrite(bp); 406 if (bp->b_flags & B_ERROR) 407 error = bp->b_error; 408 } 409 } while (error == 0 && uio->uio_resid > 0 && n != 0); 410 return (error); 411 412 default: 413 panic("spec_write type"); 414 } 415 /* NOTREACHED */ 416 } 417 418 /* 419 * Device ioctl operation. 420 */ 421 /* ARGSUSED */ 422 int 423 spec_ioctl(v) 424 void *v; 425 { 426 struct vop_ioctl_args /* { 427 struct vnode *a_vp; 428 u_long a_command; 429 caddr_t a_data; 430 int a_fflag; 431 struct ucred *a_cred; 432 struct proc *a_p; 433 } */ *ap = v; 434 dev_t dev = ap->a_vp->v_rdev; 435 int maj = major(dev); 436 437 switch (ap->a_vp->v_type) { 438 439 case VCHR: 440 return ((*cdevsw[maj].d_ioctl)(dev, ap->a_command, ap->a_data, 441 ap->a_fflag, ap->a_p)); 442 443 case VBLK: 444 if (ap->a_command == 0 && (long)ap->a_data == B_TAPE) { 445 if (bdevsw[maj].d_type == D_TAPE) 446 return (0); 447 else 448 return (1); 449 } 450 return ((*bdevsw[maj].d_ioctl)(dev, ap->a_command, ap->a_data, 451 ap->a_fflag, ap->a_p)); 452 453 default: 454 panic("spec_ioctl"); 455 /* NOTREACHED */ 456 } 457 } 458 459 /* ARGSUSED */ 460 int 461 spec_poll(v) 462 void *v; 463 { 464 struct vop_poll_args /* { 465 struct vnode *a_vp; 466 int a_events; 467 struct proc *a_p; 468 } */ *ap = v; 469 dev_t dev; 470 471 switch (ap->a_vp->v_type) { 472 473 case VCHR: 474 dev = ap->a_vp->v_rdev; 475 return (*cdevsw[major(dev)].d_poll)(dev, ap->a_events, ap->a_p); 476 477 default: 478 return (genfs_poll(v)); 479 } 480 } 481 /* 482 * Synch buffers associated with a block device 483 */ 484 /* ARGSUSED */ 485 int 486 spec_fsync(v) 487 void *v; 488 { 489 struct vop_fsync_args /* { 490 struct vnode *a_vp; 491 struct ucred *a_cred; 492 int a_flags; 493 off_t offlo; 494 off_t offhi; 495 struct proc *a_p; 496 } */ *ap = v; 497 struct vnode *vp = ap->a_vp; 498 499 if (vp->v_type == VBLK) 500 vflushbuf(vp, (ap->a_flags & FSYNC_WAIT) != 0); 501 return (0); 502 } 503 504 /* 505 * Just call the device strategy routine 506 */ 507 int 508 spec_strategy(v) 509 void *v; 510 { 511 struct vop_strategy_args /* { 512 struct buf *a_bp; 513 } */ *ap = v; 514 struct buf *bp; 515 516 bp = ap->a_bp; 517 if (!(bp->b_flags & B_READ) && 518 (LIST_FIRST(&bp->b_dep)) != NULL && bioops.io_start) 519 (*bioops.io_start)(bp); 520 (*bdevsw[major(bp->b_dev)].d_strategy)(bp); 521 return (0); 522 } 523 524 int 525 spec_inactive(v) 526 void *v; 527 { 528 struct vop_inactive_args /* { 529 struct vnode *a_vp; 530 struct proc *a_p; 531 } */ *ap = v; 532 533 VOP_UNLOCK(ap->a_vp, 0); 534 return (0); 535 } 536 537 /* 538 * This is a noop, simply returning what one has been given. 539 */ 540 int 541 spec_bmap(v) 542 void *v; 543 { 544 struct vop_bmap_args /* { 545 struct vnode *a_vp; 546 daddr_t a_bn; 547 struct vnode **a_vpp; 548 daddr_t *a_bnp; 549 int *a_runp; 550 } */ *ap = v; 551 552 if (ap->a_vpp != NULL) 553 *ap->a_vpp = ap->a_vp; 554 if (ap->a_bnp != NULL) 555 *ap->a_bnp = ap->a_bn; 556 if (ap->a_runp != NULL) 557 *ap->a_runp = (MAXBSIZE >> DEV_BSHIFT) - 1; 558 return (0); 559 } 560 561 /* 562 * Device close routine 563 */ 564 /* ARGSUSED */ 565 int 566 spec_close(v) 567 void *v; 568 { 569 struct vop_close_args /* { 570 struct vnode *a_vp; 571 int a_fflag; 572 struct ucred *a_cred; 573 struct proc *a_p; 574 } */ *ap = v; 575 struct vnode *vp = ap->a_vp; 576 dev_t dev = vp->v_rdev; 577 int (*devclose) __P((dev_t, int, int, struct proc *)); 578 int mode, error, count, flags, flags1; 579 580 count = vcount(vp); 581 simple_lock(&vp->v_interlock); 582 flags = vp->v_flag; 583 simple_unlock(&vp->v_interlock); 584 585 switch (vp->v_type) { 586 587 case VCHR: 588 /* 589 * Hack: a tty device that is a controlling terminal 590 * has a reference from the session structure. 591 * We cannot easily tell that a character device is 592 * a controlling terminal, unless it is the closing 593 * process' controlling terminal. In that case, 594 * if the reference count is 2 (this last descriptor 595 * plus the session), release the reference from the session. 596 */ 597 if (count == 2 && ap->a_p && 598 vp == ap->a_p->p_session->s_ttyvp) { 599 vrele(vp); 600 count--; 601 ap->a_p->p_session->s_ttyvp = NULL; 602 } 603 /* 604 * If the vnode is locked, then we are in the midst 605 * of forcably closing the device, otherwise we only 606 * close on last reference. 607 */ 608 if (count > 1 && (flags & VXLOCK) == 0) 609 return (0); 610 devclose = cdevsw[major(dev)].d_close; 611 mode = S_IFCHR; 612 break; 613 614 case VBLK: 615 /* 616 * On last close of a block device (that isn't mounted) 617 * we must invalidate any in core blocks, so that 618 * we can, for instance, change floppy disks. 619 */ 620 error = vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_p, 0, 0); 621 if (error) 622 return (error); 623 /* 624 * We do not want to really close the device if it 625 * is still in use unless we are trying to close it 626 * forcibly. Since every use (buffer, vnode, swap, cmap) 627 * holds a reference to the vnode, and because we mark 628 * any other vnodes that alias this device, when the 629 * sum of the reference counts on all the aliased 630 * vnodes descends to one, we are on last close. 631 */ 632 if (count > 1 && (flags & VXLOCK) == 0) 633 return (0); 634 devclose = bdevsw[major(dev)].d_close; 635 mode = S_IFBLK; 636 break; 637 638 default: 639 panic("spec_close: not special"); 640 } 641 642 flags1 = ap->a_fflag; 643 644 /* 645 * if VXLOCK is set, then we're going away soon, so make this 646 * non-blocking. Also ensures that we won't wedge in vn_lock below. 647 */ 648 if (flags & VXLOCK) 649 flags1 |= FNONBLOCK; 650 651 /* 652 * If we're able to block, release the vnode lock & reacquire. We 653 * might end up sleaping for someone else who wants our queues. They 654 * won't get them if we hold the vnode locked. Also, if VXLOCK is set, 655 * don't release the lock as we won't be able to regain it. 656 */ 657 if (!(flags1 & FNONBLOCK)) 658 VOP_UNLOCK(vp, 0); 659 660 error = (*devclose)(dev, flags1, mode, ap->a_p); 661 662 if (!(flags1 & FNONBLOCK)) 663 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 664 665 return (error); 666 } 667 668 /* 669 * Print out the contents of a special device vnode. 670 */ 671 int 672 spec_print(v) 673 void *v; 674 { 675 struct vop_print_args /* { 676 struct vnode *a_vp; 677 } */ *ap = v; 678 679 printf("tag VT_NON, dev %d, %d\n", major(ap->a_vp->v_rdev), 680 minor(ap->a_vp->v_rdev)); 681 return 0; 682 } 683 684 /* 685 * Return POSIX pathconf information applicable to special devices. 686 */ 687 int 688 spec_pathconf(v) 689 void *v; 690 { 691 struct vop_pathconf_args /* { 692 struct vnode *a_vp; 693 int a_name; 694 register_t *a_retval; 695 } */ *ap = v; 696 697 switch (ap->a_name) { 698 case _PC_LINK_MAX: 699 *ap->a_retval = LINK_MAX; 700 return (0); 701 case _PC_MAX_CANON: 702 *ap->a_retval = MAX_CANON; 703 return (0); 704 case _PC_MAX_INPUT: 705 *ap->a_retval = MAX_INPUT; 706 return (0); 707 case _PC_PIPE_BUF: 708 *ap->a_retval = PIPE_BUF; 709 return (0); 710 case _PC_CHOWN_RESTRICTED: 711 *ap->a_retval = 1; 712 return (0); 713 case _PC_VDISABLE: 714 *ap->a_retval = _POSIX_VDISABLE; 715 return (0); 716 case _PC_SYNC_IO: 717 *ap->a_retval = 1; 718 return (0); 719 default: 720 return (EINVAL); 721 } 722 /* NOTREACHED */ 723 } 724 725 /* 726 * Advisory record locking support. 727 */ 728 int 729 spec_advlock(v) 730 void *v; 731 { 732 struct vop_advlock_args /* { 733 struct vnode *a_vp; 734 caddr_t a_id; 735 int a_op; 736 struct flock *a_fl; 737 int a_flags; 738 } */ *ap = v; 739 struct vnode *vp = ap->a_vp; 740 741 return lf_advlock(ap, &vp->v_speclockf, (off_t)0); 742 } 743
Indexes created Wed Sep 24 05:09:52 GMT 2025