1 /* $NetBSD: dksubr.c,v 1.50 2014/05/25 19:23:49 bouyer Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 1997, 1998, 1999, 2002, 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe and Roland C. Dowdeswell. 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: dksubr.c,v 1.50 2014/05/25 19:23:49 bouyer Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/stat.h> 38 #include <sys/proc.h> 39 #include <sys/ioctl.h> 40 #include <sys/device.h> 41 #include <sys/disk.h> 42 #include <sys/disklabel.h> 43 #include <sys/buf.h> 44 #include <sys/bufq.h> 45 #include <sys/vnode.h> 46 #include <sys/fcntl.h> 47 #include <sys/namei.h> 48 #include <sys/module.h> 49 50 #include <dev/dkvar.h> 51 52 int dkdebug = 0; 53 54 #ifdef DEBUG 55 #define DKDB_FOLLOW 0x1 56 #define DKDB_INIT 0x2 57 #define DKDB_VNODE 0x4 58 59 #define IFDEBUG(x,y) if (dkdebug & (x)) y 60 #define DPRINTF(x,y) IFDEBUG(x, printf y) 61 #define DPRINTF_FOLLOW(y) DPRINTF(DKDB_FOLLOW, y) 62 #else 63 #define IFDEBUG(x,y) 64 #define DPRINTF(x,y) 65 #define DPRINTF_FOLLOW(y) 66 #endif 67 68 static int dk_subr_modcmd(modcmd_t, void *); 69 70 #define DKLABELDEV(dev) \ 71 (MAKEDISKDEV(major((dev)), DISKUNIT((dev)), RAW_PART)) 72 73 static void dk_makedisklabel(struct dk_intf *, struct dk_softc *); 74 75 void 76 dk_sc_init(struct dk_softc *dksc, const char *xname) 77 { 78 79 memset(dksc, 0x0, sizeof(*dksc)); 80 strncpy(dksc->sc_xname, xname, DK_XNAME_SIZE); 81 dksc->sc_dkdev.dk_name = dksc->sc_xname; 82 } 83 84 /* ARGSUSED */ 85 int 86 dk_open(struct dk_intf *di, struct dk_softc *dksc, dev_t dev, 87 int flags, int fmt, struct lwp *l) 88 { 89 struct disklabel *lp = dksc->sc_dkdev.dk_label; 90 int part = DISKPART(dev); 91 int pmask = 1 << part; 92 int ret = 0; 93 struct disk *dk = &dksc->sc_dkdev; 94 95 DPRINTF_FOLLOW(("dk_open(%s, %p, 0x%"PRIx64", 0x%x)\n", 96 di->di_dkname, dksc, dev, flags)); 97 98 mutex_enter(&dk->dk_openlock); 99 part = DISKPART(dev); 100 101 /* 102 * If there are wedges, and this is not RAW_PART, then we 103 * need to fail. 104 */ 105 if (dk->dk_nwedges != 0 && part != RAW_PART) { 106 ret = EBUSY; 107 goto done; 108 } 109 110 pmask = 1 << part; 111 112 /* 113 * If we're init'ed and there are no other open partitions then 114 * update the in-core disklabel. 115 */ 116 if ((dksc->sc_flags & DKF_INITED)) { 117 if (dk->dk_openmask == 0) { 118 dk_getdisklabel(di, dksc, dev); 119 } 120 /* XXX re-discover wedges? */ 121 } 122 123 /* Fail if we can't find the partition. */ 124 if ((part != RAW_PART) && 125 (((dksc->sc_flags & DKF_INITED) == 0) || 126 ((part >= lp->d_npartitions) || 127 (lp->d_partitions[part].p_fstype == FS_UNUSED)))) { 128 ret = ENXIO; 129 goto done; 130 } 131 132 /* Mark our unit as open. */ 133 switch (fmt) { 134 case S_IFCHR: 135 dk->dk_copenmask |= pmask; 136 break; 137 case S_IFBLK: 138 dk->dk_bopenmask |= pmask; 139 break; 140 } 141 142 dk->dk_openmask = dk->dk_copenmask | dk->dk_bopenmask; 143 144 done: 145 mutex_exit(&dk->dk_openlock); 146 return ret; 147 } 148 149 /* ARGSUSED */ 150 int 151 dk_close(struct dk_intf *di, struct dk_softc *dksc, dev_t dev, 152 int flags, int fmt, struct lwp *l) 153 { 154 int part = DISKPART(dev); 155 int pmask = 1 << part; 156 struct disk *dk = &dksc->sc_dkdev; 157 158 DPRINTF_FOLLOW(("dk_close(%s, %p, 0x%"PRIx64", 0x%x)\n", 159 di->di_dkname, dksc, dev, flags)); 160 161 mutex_enter(&dk->dk_openlock); 162 163 switch (fmt) { 164 case S_IFCHR: 165 dk->dk_copenmask &= ~pmask; 166 break; 167 case S_IFBLK: 168 dk->dk_bopenmask &= ~pmask; 169 break; 170 } 171 dk->dk_openmask = dk->dk_copenmask | dk->dk_bopenmask; 172 173 mutex_exit(&dk->dk_openlock); 174 return 0; 175 } 176 177 void 178 dk_strategy(struct dk_intf *di, struct dk_softc *dksc, struct buf *bp) 179 { 180 int s; 181 int wlabel; 182 daddr_t blkno; 183 184 DPRINTF_FOLLOW(("dk_strategy(%s, %p, %p)\n", 185 di->di_dkname, dksc, bp)); 186 187 if (!(dksc->sc_flags & DKF_INITED)) { 188 DPRINTF_FOLLOW(("dk_strategy: not inited\n")); 189 bp->b_error = ENXIO; 190 biodone(bp); 191 return; 192 } 193 194 /* XXX look for some more errors, c.f. ld.c */ 195 196 bp->b_resid = bp->b_bcount; 197 198 /* If there is nothing to do, then we are done */ 199 if (bp->b_bcount == 0) { 200 biodone(bp); 201 return; 202 } 203 204 wlabel = dksc->sc_flags & (DKF_WLABEL|DKF_LABELLING); 205 if (DISKPART(bp->b_dev) != RAW_PART && 206 bounds_check_with_label(&dksc->sc_dkdev, bp, wlabel) <= 0) { 207 biodone(bp); 208 return; 209 } 210 211 blkno = bp->b_blkno; 212 if (DISKPART(bp->b_dev) != RAW_PART) { 213 struct partition *pp; 214 215 pp = 216 &dksc->sc_dkdev.dk_label->d_partitions[DISKPART(bp->b_dev)]; 217 blkno += pp->p_offset; 218 } 219 bp->b_rawblkno = blkno; 220 221 /* 222 * Start the unit by calling the start routine 223 * provided by the individual driver. 224 */ 225 s = splbio(); 226 bufq_put(dksc->sc_bufq, bp); 227 di->di_diskstart(dksc); 228 splx(s); 229 return; 230 } 231 232 int 233 dk_size(struct dk_intf *di, struct dk_softc *dksc, dev_t dev) 234 { 235 struct disklabel *lp; 236 int is_open; 237 int part; 238 int size; 239 240 if ((dksc->sc_flags & DKF_INITED) == 0) 241 return -1; 242 243 part = DISKPART(dev); 244 is_open = dksc->sc_dkdev.dk_openmask & (1 << part); 245 246 if (!is_open && di->di_open(dev, 0, S_IFBLK, curlwp)) 247 return -1; 248 249 lp = dksc->sc_dkdev.dk_label; 250 if (lp->d_partitions[part].p_fstype != FS_SWAP) 251 size = -1; 252 else 253 size = lp->d_partitions[part].p_size * 254 (lp->d_secsize / DEV_BSIZE); 255 256 if (!is_open && di->di_close(dev, 0, S_IFBLK, curlwp)) 257 return 1; 258 259 return size; 260 } 261 262 int 263 dk_ioctl(struct dk_intf *di, struct dk_softc *dksc, dev_t dev, 264 u_long cmd, void *data, int flag, struct lwp *l) 265 { 266 struct disklabel *lp; 267 struct disk *dk; 268 #ifdef __HAVE_OLD_DISKLABEL 269 struct disklabel newlabel; 270 #endif 271 int error = 0; 272 273 DPRINTF_FOLLOW(("dk_ioctl(%s, %p, 0x%"PRIx64", 0x%lx)\n", 274 di->di_dkname, dksc, dev, cmd)); 275 276 /* ensure that the pseudo disk is open for writes for these commands */ 277 switch (cmd) { 278 case DIOCSDINFO: 279 case DIOCWDINFO: 280 #ifdef __HAVE_OLD_DISKLABEL 281 case ODIOCSDINFO: 282 case ODIOCWDINFO: 283 #endif 284 case DIOCWLABEL: 285 case DIOCAWEDGE: 286 case DIOCDWEDGE: 287 if ((flag & FWRITE) == 0) 288 return EBADF; 289 } 290 291 /* ensure that the pseudo-disk is initialized for these */ 292 switch (cmd) { 293 #ifdef DIOCGSECTORSIZE 294 case DIOCGSECTORSIZE: 295 case DIOCGMEDIASIZE: 296 #endif 297 case DIOCGDINFO: 298 case DIOCSDINFO: 299 case DIOCWDINFO: 300 case DIOCGPART: 301 case DIOCWLABEL: 302 case DIOCGDEFLABEL: 303 case DIOCAWEDGE: 304 case DIOCDWEDGE: 305 case DIOCLWEDGES: 306 case DIOCCACHESYNC: 307 #ifdef __HAVE_OLD_DISKLABEL 308 case ODIOCGDINFO: 309 case ODIOCSDINFO: 310 case ODIOCWDINFO: 311 case ODIOCGDEFLABEL: 312 #endif 313 if ((dksc->sc_flags & DKF_INITED) == 0) 314 return ENXIO; 315 } 316 317 switch (cmd) { 318 #ifdef DIOCGSECTORSIZE 319 case DIOCGSECTORSIZE: 320 *(u_int *)data = dksc->sc_dkdev.dk_geom.dg_secsize; 321 return 0; 322 case DIOCGMEDIASIZE: 323 *(off_t *)data = 324 (off_t)dksc->sc_dkdev.dk_geom.dg_secsize * 325 dksc->sc_dkdev.dk_geom.dg_nsectors; 326 return 0; 327 #endif 328 329 case DIOCGDINFO: 330 *(struct disklabel *)data = *(dksc->sc_dkdev.dk_label); 331 break; 332 333 #ifdef __HAVE_OLD_DISKLABEL 334 case ODIOCGDINFO: 335 newlabel = *(dksc->sc_dkdev.dk_label); 336 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 337 return ENOTTY; 338 memcpy(data, &newlabel, sizeof (struct olddisklabel)); 339 break; 340 #endif 341 342 case DIOCGPART: 343 ((struct partinfo *)data)->disklab = dksc->sc_dkdev.dk_label; 344 ((struct partinfo *)data)->part = 345 &dksc->sc_dkdev.dk_label->d_partitions[DISKPART(dev)]; 346 break; 347 348 case DIOCWDINFO: 349 case DIOCSDINFO: 350 #ifdef __HAVE_OLD_DISKLABEL 351 case ODIOCWDINFO: 352 case ODIOCSDINFO: 353 #endif 354 #ifdef __HAVE_OLD_DISKLABEL 355 if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) { 356 memset(&newlabel, 0, sizeof newlabel); 357 memcpy(&newlabel, data, sizeof (struct olddisklabel)); 358 lp = &newlabel; 359 } else 360 #endif 361 lp = (struct disklabel *)data; 362 363 dk = &dksc->sc_dkdev; 364 mutex_enter(&dk->dk_openlock); 365 dksc->sc_flags |= DKF_LABELLING; 366 367 error = setdisklabel(dksc->sc_dkdev.dk_label, 368 lp, 0, dksc->sc_dkdev.dk_cpulabel); 369 if (error == 0) { 370 if (cmd == DIOCWDINFO 371 #ifdef __HAVE_OLD_DISKLABEL 372 || cmd == ODIOCWDINFO 373 #endif 374 ) 375 error = writedisklabel(DKLABELDEV(dev), 376 di->di_strategy, dksc->sc_dkdev.dk_label, 377 dksc->sc_dkdev.dk_cpulabel); 378 } 379 380 dksc->sc_flags &= ~DKF_LABELLING; 381 mutex_exit(&dk->dk_openlock); 382 break; 383 384 case DIOCWLABEL: 385 if (*(int *)data != 0) 386 dksc->sc_flags |= DKF_WLABEL; 387 else 388 dksc->sc_flags &= ~DKF_WLABEL; 389 break; 390 391 case DIOCGDEFLABEL: 392 dk_getdefaultlabel(di, dksc, (struct disklabel *)data); 393 break; 394 395 #ifdef __HAVE_OLD_DISKLABEL 396 case ODIOCGDEFLABEL: 397 dk_getdefaultlabel(di, dksc, &newlabel); 398 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 399 return ENOTTY; 400 memcpy(data, &newlabel, sizeof (struct olddisklabel)); 401 break; 402 #endif 403 404 case DIOCAWEDGE: 405 { 406 struct dkwedge_info *dkw = (void *)data; 407 408 if ((flag & FWRITE) == 0) 409 return (EBADF); 410 411 /* If the ioctl happens here, the parent is us. */ 412 strcpy(dkw->dkw_parent, dksc->sc_dkdev.dk_name); 413 return (dkwedge_add(dkw)); 414 } 415 416 case DIOCDWEDGE: 417 { 418 struct dkwedge_info *dkw = (void *)data; 419 420 if ((flag & FWRITE) == 0) 421 return (EBADF); 422 423 /* If the ioctl happens here, the parent is us. */ 424 strcpy(dkw->dkw_parent, dksc->sc_dkdev.dk_name); 425 return (dkwedge_del(dkw)); 426 } 427 428 case DIOCLWEDGES: 429 { 430 struct dkwedge_list *dkwl = (void *)data; 431 432 return (dkwedge_list(&dksc->sc_dkdev, dkwl, l)); 433 } 434 435 case DIOCGSTRATEGY: 436 { 437 struct disk_strategy *dks = (void *)data; 438 int s; 439 440 s = splbio(); 441 strlcpy(dks->dks_name, bufq_getstrategyname(dksc->sc_bufq), 442 sizeof(dks->dks_name)); 443 splx(s); 444 dks->dks_paramlen = 0; 445 446 return 0; 447 } 448 449 case DIOCSSTRATEGY: 450 { 451 struct disk_strategy *dks = (void *)data; 452 struct bufq_state *new; 453 struct bufq_state *old; 454 int s; 455 456 if ((flag & FWRITE) == 0) { 457 return EBADF; 458 } 459 if (dks->dks_param != NULL) { 460 return EINVAL; 461 } 462 dks->dks_name[sizeof(dks->dks_name) - 1] = 0; /* ensure term */ 463 error = bufq_alloc(&new, dks->dks_name, 464 BUFQ_EXACT|BUFQ_SORT_RAWBLOCK); 465 if (error) { 466 return error; 467 } 468 s = splbio(); 469 old = dksc->sc_bufq; 470 bufq_move(new, old); 471 dksc->sc_bufq = new; 472 splx(s); 473 bufq_free(old); 474 475 return 0; 476 } 477 478 default: 479 error = ENOTTY; 480 } 481 482 return error; 483 } 484 485 /* 486 * dk_dump dumps all of physical memory into the partition specified. 487 * This requires substantially more framework than {s,w}ddump, and hence 488 * is probably much more fragile. 489 * 490 * XXX: we currently do not implement this. 491 */ 492 493 #define DKF_READYFORDUMP (DKF_INITED|DKF_TAKEDUMP) 494 #define DKFF_READYFORDUMP(x) (((x) & DKF_READYFORDUMP) == DKF_READYFORDUMP) 495 static volatile int dk_dumping = 0; 496 497 /* ARGSUSED */ 498 int 499 dk_dump(struct dk_intf *di, struct dk_softc *dksc, dev_t dev, 500 daddr_t blkno, void *va, size_t size) 501 { 502 503 /* 504 * ensure that we consider this device to be safe for dumping, 505 * and that the device is configured. 506 */ 507 if (!DKFF_READYFORDUMP(dksc->sc_flags)) 508 return ENXIO; 509 510 /* ensure that we are not already dumping */ 511 if (dk_dumping) 512 return EFAULT; 513 dk_dumping = 1; 514 515 /* XXX: unimplemented */ 516 517 dk_dumping = 0; 518 519 /* XXX: actually for now, we are going to leave this alone */ 520 return ENXIO; 521 } 522 523 /* ARGSUSED */ 524 void 525 dk_getdefaultlabel(struct dk_intf *di, struct dk_softc *dksc, 526 struct disklabel *lp) 527 { 528 struct disk_geom *dg = &dksc->sc_dkdev.dk_geom; 529 530 memset(lp, 0, sizeof(*lp)); 531 532 lp->d_secperunit = dg->dg_secperunit; 533 lp->d_secsize = dg->dg_secsize; 534 lp->d_nsectors = dg->dg_nsectors; 535 lp->d_ntracks = dg->dg_ntracks; 536 lp->d_ncylinders = dg->dg_ncylinders; 537 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 538 539 strncpy(lp->d_typename, di->di_dkname, sizeof(lp->d_typename)); 540 lp->d_type = di->di_dtype; 541 strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname)); 542 lp->d_rpm = 3600; 543 lp->d_interleave = 1; 544 lp->d_flags = 0; 545 546 lp->d_partitions[RAW_PART].p_offset = 0; 547 lp->d_partitions[RAW_PART].p_size = dg->dg_secperunit; 548 lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED; 549 lp->d_npartitions = RAW_PART + 1; 550 551 lp->d_magic = DISKMAGIC; 552 lp->d_magic2 = DISKMAGIC; 553 lp->d_checksum = dkcksum(dksc->sc_dkdev.dk_label); 554 } 555 556 /* ARGSUSED */ 557 void 558 dk_getdisklabel(struct dk_intf *di, struct dk_softc *dksc, dev_t dev) 559 { 560 struct disklabel *lp = dksc->sc_dkdev.dk_label; 561 struct cpu_disklabel *clp = dksc->sc_dkdev.dk_cpulabel; 562 struct disk_geom *dg = &dksc->sc_dkdev.dk_geom; 563 struct partition *pp; 564 int i; 565 const char *errstring; 566 567 memset(clp, 0x0, sizeof(*clp)); 568 dk_getdefaultlabel(di, dksc, lp); 569 errstring = readdisklabel(DKLABELDEV(dev), di->di_strategy, 570 dksc->sc_dkdev.dk_label, dksc->sc_dkdev.dk_cpulabel); 571 if (errstring) { 572 dk_makedisklabel(di, dksc); 573 if (dksc->sc_flags & DKF_WARNLABEL) 574 printf("%s: %s\n", dksc->sc_xname, errstring); 575 return; 576 } 577 578 if ((dksc->sc_flags & DKF_LABELSANITY) == 0) 579 return; 580 581 /* Sanity check */ 582 if (lp->d_secperunit != dg->dg_secperunit) 583 printf("WARNING: %s: total sector size in disklabel (%d) " 584 "!= the size of %s (%" PRId64 ")\n", dksc->sc_xname, 585 lp->d_secperunit, di->di_dkname, dg->dg_secperunit); 586 587 for (i=0; i < lp->d_npartitions; i++) { 588 pp = &lp->d_partitions[i]; 589 if (pp->p_offset + pp->p_size > dg->dg_secperunit) 590 printf("WARNING: %s: end of partition `%c' exceeds " 591 "the size of %s (%" PRId64 ")\n", dksc->sc_xname, 592 'a' + i, di->di_dkname, dg->dg_secperunit); 593 } 594 } 595 596 /* ARGSUSED */ 597 static void 598 dk_makedisklabel(struct dk_intf *di, struct dk_softc *dksc) 599 { 600 struct disklabel *lp = dksc->sc_dkdev.dk_label; 601 602 lp->d_partitions[RAW_PART].p_fstype = FS_BSDFFS; 603 strncpy(lp->d_packname, "default label", sizeof(lp->d_packname)); 604 lp->d_checksum = dkcksum(lp); 605 } 606 607 /* This function is taken from ccd.c:1.76 --rcd */ 608 609 /* 610 * XXX this function looks too generic for dksubr.c, shouldn't we 611 * put it somewhere better? 612 */ 613 614 /* 615 * Lookup the provided name in the filesystem. If the file exists, 616 * is a valid block device, and isn't being used by anyone else, 617 * set *vpp to the file's vnode. 618 */ 619 int 620 dk_lookup(struct pathbuf *pb, struct lwp *l, struct vnode **vpp) 621 { 622 struct nameidata nd; 623 struct vnode *vp; 624 struct vattr va; 625 int error; 626 627 if (l == NULL) 628 return ESRCH; /* Is ESRCH the best choice? */ 629 630 NDINIT(&nd, LOOKUP, FOLLOW, pb); 631 if ((error = vn_open(&nd, FREAD | FWRITE, 0)) != 0) { 632 DPRINTF((DKDB_FOLLOW|DKDB_INIT), 633 ("dk_lookup: vn_open error = %d\n", error)); 634 return error; 635 } 636 637 vp = nd.ni_vp; 638 if ((error = VOP_GETATTR(vp, &va, l->l_cred)) != 0) { 639 DPRINTF((DKDB_FOLLOW|DKDB_INIT), 640 ("dk_lookup: getattr error = %d\n", error)); 641 goto out; 642 } 643 644 /* XXX: eventually we should handle VREG, too. */ 645 if (va.va_type != VBLK) { 646 error = ENOTBLK; 647 goto out; 648 } 649 650 IFDEBUG(DKDB_VNODE, vprint("dk_lookup: vnode info", vp)); 651 652 VOP_UNLOCK(vp); 653 *vpp = vp; 654 return 0; 655 out: 656 VOP_UNLOCK(vp); 657 (void) vn_close(vp, FREAD | FWRITE, l->l_cred); 658 return error; 659 } 660 661 MODULE(MODULE_CLASS_MISC, dk_subr, NULL); 662 663 static int 664 dk_subr_modcmd(modcmd_t cmd, void *arg) 665 { 666 switch (cmd) { 667 case MODULE_CMD_INIT: 668 case MODULE_CMD_FINI: 669 return 0; 670 case MODULE_CMD_STAT: 671 case MODULE_CMD_AUTOUNLOAD: 672 default: 673 return ENOTTY; 674 } 675 } 676