kern_conf.c revision 126082
1207753Smm/*- 2207753Smm * Copyright (c) 1999-2002 Poul-Henning Kamp 3207753Smm * All rights reserved. 4207753Smm * 5207753Smm * Redistribution and use in source and binary forms, with or without 6207753Smm * modification, are permitted provided that the following conditions 7207753Smm * are met: 8207753Smm * 1. Redistributions of source code must retain the above copyright 9207753Smm * notice, this list of conditions and the following disclaimer. 10207753Smm * 2. Redistributions in binary form must reproduce the above copyright 11207753Smm * notice, this list of conditions and the following disclaimer in the 12207753Smm * documentation and/or other materials provided with the distribution. 13207753Smm * 14207753Smm * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15207753Smm * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16207753Smm * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17207753Smm * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18207753Smm * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19207753Smm * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20207753Smm * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21207753Smm * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22207753Smm * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23207753Smm * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24207753Smm * SUCH DAMAGE. 25207753Smm */ 26207753Smm 27207753Smm#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/kern/kern_conf.c 126082 2004-02-21 21:57:26Z phk $"); 29 30#include <sys/param.h> 31#include <sys/kernel.h> 32#include <sys/systm.h> 33#include <sys/bio.h> 34#include <sys/lock.h> 35#include <sys/mutex.h> 36#include <sys/sysctl.h> 37#include <sys/module.h> 38#include <sys/malloc.h> 39#include <sys/conf.h> 40#include <sys/vnode.h> 41#include <sys/queue.h> 42#include <sys/poll.h> 43#include <sys/ctype.h> 44#include <sys/tty.h> 45#include <machine/stdarg.h> 46 47static MALLOC_DEFINE(M_DEVT, "dev_t", "dev_t storage"); 48 49/* Built at compile time from sys/conf/majors */ 50extern unsigned char reserved_majors[256]; 51 52/* 53 * This is the number of hash-buckets. Experiements with 'real-life' 54 * udev_t's show that a prime halfway between two powers of two works 55 * best. 56 */ 57#define DEVT_HASH 83 58 59/* The number of dev_t's we can create before malloc(9) kick in. */ 60#define DEVT_STASH 50 61 62static struct cdev devt_stash[DEVT_STASH]; 63 64static LIST_HEAD(, cdev) dev_hash[DEVT_HASH]; 65 66static LIST_HEAD(, cdev) dev_free; 67 68static int free_devt; 69SYSCTL_INT(_debug, OID_AUTO, free_devt, CTLFLAG_RW, &free_devt, 0, ""); 70 71static struct mtx devmtx; 72static void freedev(dev_t dev); 73 74static void 75devlock(void) 76{ 77 if (!mtx_initialized(&devmtx)) 78 mtx_init(&devmtx, "dev_t", NULL, MTX_DEF); 79 mtx_lock(&devmtx); 80} 81 82static void 83devunlock(void) 84{ 85 mtx_unlock(&devmtx); 86} 87 88void 89dev_ref(dev_t dev) 90{ 91 devlock(); 92 dev->si_refcount++; 93 devunlock(); 94} 95 96void 97dev_rel(dev_t dev) 98{ 99 devlock(); 100 dev->si_refcount--; 101 KASSERT(dev->si_refcount >= 0, 102 ("dev_rel(%s) gave negative count", devtoname(dev))); 103 if (dev->si_devsw == NULL && dev->si_refcount == 0) { 104 LIST_REMOVE(dev, si_list); 105 freedev(dev); 106 } 107 devunlock(); 108} 109 110void 111cdevsw_ref(struct cdevsw *csw) 112{ 113 devlock(); 114 csw->d_refcount++; 115 devunlock(); 116} 117 118void 119cdevsw_rel(struct cdevsw *csw) 120{ 121 devlock(); 122 csw->d_refcount--; 123 KASSERT(csw->d_refcount >= 0, 124 ("cdevsw_vrel(%s) gave negative count", csw->d_name)); 125 devunlock(); 126} 127 128static dev_t makedev(int x, int y); 129 130int 131nullop(void) 132{ 133 134 return (0); 135} 136 137int 138eopnotsupp(void) 139{ 140 141 return (EOPNOTSUPP); 142} 143 144static int 145enxio(void) 146{ 147 return (ENXIO); 148} 149 150static int 151enodev(void) 152{ 153 return (ENODEV); 154} 155 156/* Define a dead_cdevsw for use when devices leave unexpectedly. */ 157 158#define dead_open (d_open_t *)enxio 159#define dead_close (d_close_t *)enxio 160#define dead_read (d_read_t *)enxio 161#define dead_write (d_write_t *)enxio 162#define dead_ioctl (d_ioctl_t *)enxio 163#define dead_poll (d_poll_t *)enodev 164#define dead_mmap (d_mmap_t *)enodev 165 166static void 167dead_strategy(struct bio *bp) 168{ 169 170 biofinish(bp, NULL, ENXIO); 171} 172 173#define dead_dump (dumper_t *)enxio 174#define dead_kqfilter (d_kqfilter_t *)enxio 175 176static struct cdevsw dead_cdevsw = { 177 .d_version = D_VERSION, 178 .d_flags = D_NEEDGIANT, /* XXX: does dead_strategy need this ? */ 179 .d_open = dead_open, 180 .d_close = dead_close, 181 .d_read = dead_read, 182 .d_write = dead_write, 183 .d_ioctl = dead_ioctl, 184 .d_poll = dead_poll, 185 .d_mmap = dead_mmap, 186 .d_strategy = dead_strategy, 187 .d_name = "dead", 188 .d_maj = 255, 189 .d_dump = dead_dump, 190 .d_kqfilter = dead_kqfilter 191}; 192 193/* Default methods if driver does not specify method */ 194 195#define null_open (d_open_t *)nullop 196#define null_close (d_close_t *)nullop 197#define no_read (d_read_t *)enodev 198#define no_write (d_write_t *)enodev 199#define no_ioctl (d_ioctl_t *)enodev 200#define no_mmap (d_mmap_t *)enodev 201 202static int 203no_kqfilter(dev_t dev __unused, struct knote *kn __unused) 204{ 205 206 return (1); 207} 208 209static void 210no_strategy(struct bio *bp) 211{ 212 213 biofinish(bp, NULL, ENODEV); 214} 215 216static int 217no_poll(dev_t dev __unused, int events, struct thread *td __unused) 218{ 219 /* 220 * Return true for read/write. If the user asked for something 221 * special, return POLLNVAL, so that clients have a way of 222 * determining reliably whether or not the extended 223 * functionality is present without hard-coding knowledge 224 * of specific filesystem implementations. 225 * Stay in sync with vop_nopoll(). 226 */ 227 if (events & ~POLLSTANDARD) 228 return (POLLNVAL); 229 230 return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 231} 232 233#define no_dump (dumper_t *)enodev 234 235struct cdevsw * 236devsw(dev_t dev) 237{ 238 if (dev->si_devsw != NULL) 239 return (dev->si_devsw); 240 return (&dead_cdevsw); 241} 242 243/* 244 * dev_t and u_dev_t primitives 245 */ 246 247int 248major(dev_t x) 249{ 250 if (x == NODEV) 251 return NOUDEV; 252 return((x->si_udev >> 8) & 0xff); 253} 254 255int 256minor(dev_t x) 257{ 258 if (x == NODEV) 259 return NOUDEV; 260 return(x->si_udev & 0xffff00ff); 261} 262 263int 264dev2unit(dev_t x) 265{ 266 int i; 267 268 if (x == NODEV) 269 return NOUDEV; 270 i = minor(x); 271 return ((i & 0xff) | (i >> 8)); 272} 273 274int 275unit2minor(int unit) 276{ 277 278 KASSERT(unit <= 0xffffff, ("Invalid unit (%d) in unit2minor", unit)); 279 return ((unit & 0xff) | ((unit << 8) & ~0xffff)); 280} 281 282static dev_t 283allocdev(void) 284{ 285 static int stashed; 286 struct cdev *si; 287 288 if (LIST_FIRST(&dev_free)) { 289 si = LIST_FIRST(&dev_free); 290 } else if (stashed >= DEVT_STASH) { 291 MALLOC(si, struct cdev *, sizeof(*si), M_DEVT, 292 M_USE_RESERVE | M_ZERO | M_WAITOK); 293 } else { 294 si = devt_stash + stashed++; 295 bzero(si, sizeof *si); 296 si->si_flags |= SI_STASHED; 297 } 298 si->__si_namebuf[0] = '\0'; 299 si->si_name = si->__si_namebuf; 300 LIST_INIT(&si->si_children); 301 TAILQ_INIT(&si->si_snapshots); 302 return (si); 303} 304 305static dev_t 306makedev(int x, int y) 307{ 308 struct cdev *si; 309 udev_t udev; 310 int hash; 311 312 if (x == umajor(NOUDEV) && y == uminor(NOUDEV)) 313 panic("makedev of NOUDEV"); 314 udev = (x << 8) | y; 315 hash = udev % DEVT_HASH; 316 LIST_FOREACH(si, &dev_hash[hash], si_hash) { 317 if (si->si_udev == udev) 318 return (si); 319 } 320 si = allocdev(); 321 si->si_udev = udev; 322 LIST_INSERT_HEAD(&dev_hash[hash], si, si_hash); 323 return (si); 324} 325 326static void 327freedev(dev_t dev) 328{ 329 330 if (dev->si_flags & SI_STASHED) { 331 bzero(dev, sizeof(*dev)); 332 dev->si_flags |= SI_STASHED; 333 LIST_INSERT_HEAD(&dev_free, dev, si_hash); 334 } else { 335 FREE(dev, M_DEVT); 336 } 337} 338 339udev_t 340dev2udev(dev_t x) 341{ 342 if (x == NODEV) 343 return (NOUDEV); 344 return (x->si_udev); 345} 346 347dev_t 348udev2dev(udev_t udev) 349{ 350 struct cdev *si; 351 int hash; 352 353 if (udev == NOUDEV) 354 return (NODEV); 355 hash = udev % DEVT_HASH; 356 LIST_FOREACH(si, &dev_hash[hash], si_hash) { 357 if (si->si_udev == udev) 358 return (si); 359 } 360 return (NODEV); 361} 362 363int 364uminor(udev_t dev) 365{ 366 return (dev & 0xffff00ff); 367} 368 369int 370umajor(udev_t dev) 371{ 372 return ((dev & 0xff00) >> 8); 373} 374 375udev_t 376makeudev(int x, int y) 377{ 378 return ((x << 8) | y); 379} 380 381static void 382find_major(struct cdevsw *devsw) 383{ 384 int i; 385 386 for (i = NUMCDEVSW - 1; i > 0; i--) 387 if (reserved_majors[i] != i) 388 break; 389 KASSERT(i > 0, ("Out of major numbers (%s)", devsw->d_name)); 390 devsw->d_maj = i; 391 reserved_majors[i] = i; 392 devsw->d_flags |= D_ALLOCMAJ; 393} 394 395static void 396fini_cdevsw(struct cdevsw *devsw) 397{ 398 if (devsw->d_flags & D_ALLOCMAJ) { 399 reserved_majors[devsw->d_maj] = 0; 400 devsw->d_maj = MAJOR_AUTO; 401 devsw->d_flags &= ~D_ALLOCMAJ; 402 } 403} 404 405static void 406prep_cdevsw(struct cdevsw *devsw) 407{ 408 409 devlock(); 410 411 if (devsw->d_version != D_VERSION_00) { 412 printf( 413 "WARNING: Device driver \"%s\" has wrong version %s\n", 414 devsw->d_name, "and is disabled. Recompile KLD module."); 415 devsw->d_open = dead_open; 416 devsw->d_close = dead_close; 417 devsw->d_read = dead_read; 418 devsw->d_write = dead_write; 419 devsw->d_ioctl = dead_ioctl; 420 devsw->d_poll = dead_poll; 421 devsw->d_mmap = dead_mmap; 422 devsw->d_strategy = dead_strategy; 423 devsw->d_dump = dead_dump; 424 devsw->d_kqfilter = dead_kqfilter; 425 } 426 427 if (devsw->d_flags & D_TTY) { 428 if (devsw->d_read == NULL) devsw->d_read = ttyread; 429 if (devsw->d_write == NULL) devsw->d_write = ttywrite; 430 if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = ttykqfilter; 431 if (devsw->d_poll == NULL) devsw->d_poll = ttypoll; 432 } 433 434 if (devsw->d_open == NULL) devsw->d_open = null_open; 435 if (devsw->d_close == NULL) devsw->d_close = null_close; 436 if (devsw->d_read == NULL) devsw->d_read = no_read; 437 if (devsw->d_write == NULL) devsw->d_write = no_write; 438 if (devsw->d_ioctl == NULL) devsw->d_ioctl = no_ioctl; 439 if (devsw->d_poll == NULL) devsw->d_poll = no_poll; 440 if (devsw->d_mmap == NULL) devsw->d_mmap = no_mmap; 441 if (devsw->d_strategy == NULL) devsw->d_strategy = no_strategy; 442 if (devsw->d_dump == NULL) devsw->d_dump = no_dump; 443 if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = no_kqfilter; 444 445 LIST_INIT(&devsw->d_devs); 446 447 devsw->d_flags |= D_INIT; 448 449 if (devsw->d_maj == MAJOR_AUTO) { 450 find_major(devsw); 451 } else { 452 if (devsw->d_maj == 256) /* XXX: tty_cons.c is magic */ 453 devsw->d_maj = 0; 454 KASSERT(devsw->d_maj >= 0 && devsw->d_maj < 256, 455 ("Invalid major (%d) in make_dev", devsw->d_maj)); 456 if (reserved_majors[devsw->d_maj] != devsw->d_maj) { 457 printf("WARNING: driver \"%s\" used %s %d\n", 458 devsw->d_name, "unreserved major device number", 459 devsw->d_maj); 460 reserved_majors[devsw->d_maj] = devsw->d_maj; 461 } 462 } 463 devunlock(); 464} 465 466dev_t 467make_dev(struct cdevsw *devsw, int minornr, uid_t uid, gid_t gid, int perms, const char *fmt, ...) 468{ 469 dev_t dev; 470 va_list ap; 471 int i; 472 473 KASSERT((minornr & ~0xffff00ff) == 0, 474 ("Invalid minor (0x%x) in make_dev", minornr)); 475 476 if (!(devsw->d_flags & D_INIT)) 477 prep_cdevsw(devsw); 478 dev = makedev(devsw->d_maj, minornr); 479 if (dev->si_flags & SI_CHEAPCLONE && 480 dev->si_flags & SI_NAMED && 481 dev->si_devsw == devsw) { 482 /* 483 * This is allowed as it removes races and generally 484 * simplifies cloning devices. 485 * XXX: still ?? 486 */ 487 return (dev); 488 } 489 devlock(); 490 KASSERT(!(dev->si_flags & SI_NAMED), 491 ("make_dev() by driver %s on pre-existing device (maj=%d, min=%d, name=%s)", 492 devsw->d_name, major(dev), minor(dev), devtoname(dev))); 493 494 va_start(ap, fmt); 495 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap); 496 if (i > (sizeof dev->__si_namebuf - 1)) { 497 printf("WARNING: Device name truncated! (%s)", 498 dev->__si_namebuf); 499 } 500 va_end(ap); 501 dev->si_devsw = devsw; 502 dev->si_uid = uid; 503 dev->si_gid = gid; 504 dev->si_mode = perms; 505 dev->si_flags |= SI_NAMED; 506 507 LIST_INSERT_HEAD(&devsw->d_devs, dev, si_list); 508 devfs_create(dev); 509 devunlock(); 510 return (dev); 511} 512 513int 514dev_named(dev_t pdev, const char *name) 515{ 516 dev_t cdev; 517 518 if (strcmp(devtoname(pdev), name) == 0) 519 return (1); 520 LIST_FOREACH(cdev, &pdev->si_children, si_siblings) 521 if (strcmp(devtoname(cdev), name) == 0) 522 return (1); 523 return (0); 524} 525 526void 527dev_depends(dev_t pdev, dev_t cdev) 528{ 529 530 devlock(); 531 cdev->si_parent = pdev; 532 cdev->si_flags |= SI_CHILD; 533 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings); 534 devunlock(); 535} 536 537dev_t 538make_dev_alias(dev_t pdev, const char *fmt, ...) 539{ 540 dev_t dev; 541 va_list ap; 542 int i; 543 544 dev = allocdev(); 545 devlock(); 546 dev->si_flags |= SI_ALIAS; 547 dev->si_flags |= SI_NAMED; 548 va_start(ap, fmt); 549 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap); 550 if (i > (sizeof dev->__si_namebuf - 1)) { 551 printf("WARNING: Device name truncated! (%s)", 552 dev->__si_namebuf); 553 } 554 va_end(ap); 555 556 devfs_create(dev); 557 devunlock(); 558 dev_depends(pdev, dev); 559 return (dev); 560} 561 562static void 563idestroy_dev(dev_t dev) 564{ 565 if (!(dev->si_flags & SI_NAMED)) { 566 printf( "WARNING: Driver mistake: destroy_dev on %d/%d\n", 567 major(dev), minor(dev)); 568 panic("don't do that"); 569 } 570 571 devfs_destroy(dev); 572 573 /* Remove name marking */ 574 dev->si_flags &= ~SI_NAMED; 575 576 /* If we are a child, remove us from the parents list */ 577 if (dev->si_flags & SI_CHILD) { 578 LIST_REMOVE(dev, si_siblings); 579 dev->si_flags &= ~SI_CHILD; 580 } 581 582 /* Kill our children */ 583 while (!LIST_EMPTY(&dev->si_children)) 584 idestroy_dev(LIST_FIRST(&dev->si_children)); 585 586 /* Remove from clone list */ 587 if (dev->si_flags & SI_CLONELIST) { 588 LIST_REMOVE(dev, si_clone); 589 dev->si_flags &= ~SI_CLONELIST; 590 } 591 592 if (!(dev->si_flags & SI_ALIAS)) { 593 /* Remove from cdevsw list */ 594 LIST_REMOVE(dev, si_list); 595 596 /* If cdevsw has no dev_t's, clean it */ 597 if (LIST_EMPTY(&dev->si_devsw->d_devs)) 598 fini_cdevsw(dev->si_devsw); 599 600 LIST_REMOVE(dev, si_hash); 601 } 602 dev->si_drv1 = 0; 603 dev->si_drv2 = 0; 604 dev->si_devsw = NULL; 605 bzero(&dev->__si_u, sizeof(dev->__si_u)); 606 dev->si_flags &= ~SI_ALIAS; 607 if (dev->si_refcount > 0) { 608 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list); 609 } else { 610 freedev(dev); 611 } 612} 613 614void 615destroy_dev(dev_t dev) 616{ 617 618 devlock(); 619 idestroy_dev(dev); 620 devunlock(); 621} 622 623const char * 624devtoname(dev_t dev) 625{ 626 char *p; 627 int mynor; 628 629 if (dev->si_name[0] == '#' || dev->si_name[0] == '\0') { 630 p = dev->si_name; 631 if (devsw(dev)) 632 sprintf(p, "#%s/", devsw(dev)->d_name); 633 else 634 sprintf(p, "#%d/", major(dev)); 635 p += strlen(p); 636 mynor = minor(dev); 637 if (mynor < 0 || mynor > 255) 638 sprintf(p, "%#x", (u_int)mynor); 639 else 640 sprintf(p, "%d", mynor); 641 } 642 return (dev->si_name); 643} 644 645int 646dev_stdclone(char *name, char **namep, const char *stem, int *unit) 647{ 648 int u, i; 649 650 i = strlen(stem); 651 if (bcmp(stem, name, i) != 0) 652 return (0); 653 if (!isdigit(name[i])) 654 return (0); 655 u = 0; 656 if (name[i] == '0' && isdigit(name[i+1])) 657 return (0); 658 while (isdigit(name[i])) { 659 u *= 10; 660 u += name[i++] - '0'; 661 } 662 if (u > 0xffffff) 663 return (0); 664 *unit = u; 665 if (namep) 666 *namep = &name[i]; 667 if (name[i]) 668 return (2); 669 return (1); 670} 671 672/* 673 * Helper functions for cloning device drivers. 674 * 675 * The objective here is to make it unnecessary for the device drivers to 676 * use rman or similar to manage their unit number space. Due to the way 677 * we do "on-demand" devices, using rman or other "private" methods 678 * will be very tricky to lock down properly once we lock down this file. 679 * 680 * Instead we give the drivers these routines which puts the dev_t's that 681 * are to be managed on their own list, and gives the driver the ability 682 * to ask for the first free unit number or a given specified unit number. 683 * 684 * In addition these routines support paired devices (pty, nmdm and similar) 685 * by respecting a number of "flag" bits in the minor number. 686 * 687 */ 688 689struct clonedevs { 690 LIST_HEAD(,cdev) head; 691}; 692 693int 694clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, dev_t *dp, u_int extra) 695{ 696 struct clonedevs *cd; 697 dev_t dev, dl, de; 698 int unit, low, u; 699 700 KASSERT(!(extra & CLONE_UNITMASK), 701 ("Illegal extra bits (0x%x) in clone_create", extra)); 702 KASSERT(*up <= CLONE_UNITMASK, 703 ("Too high unit (0x%x) in clone_create", *up)); 704 705 if (csw->d_maj == MAJOR_AUTO) 706 find_major(csw); 707 /* if clonedevs have not been initialized, we do it here */ 708 cd = *cdp; 709 if (cd == NULL) { 710 cd = malloc(sizeof *cd, M_DEVBUF, M_WAITOK | M_ZERO); 711 LIST_INIT(&cd->head); 712 *cdp = cd; 713 } 714 715 /* 716 * Search the list for a lot of things in one go: 717 * A preexisting match is returned immediately. 718 * The lowest free unit number if we are passed -1, and the place 719 * in the list where we should insert that new element. 720 * The place to insert a specified unit number, if applicable 721 * the end of the list. 722 */ 723 unit = *up; 724 low = 0; 725 de = dl = NULL; 726 LIST_FOREACH(dev, &cd->head, si_clone) { 727 u = dev2unit(dev); 728 if (u == (unit | extra)) { 729 *dp = dev; 730 return (0); 731 } 732 if (unit == -1 && u == low) { 733 low++; 734 de = dev; 735 continue; 736 } 737 if (u > unit) { 738 dl = dev; 739 break; 740 } 741 de = dev; 742 } 743 if (unit == -1) 744 unit = low; 745 dev = makedev(csw->d_maj, unit2minor(unit | extra)); 746 KASSERT(!(dev->si_flags & SI_CLONELIST), 747 ("Dev %p should not be on clonelist", dev)); 748 if (dl != NULL) 749 LIST_INSERT_BEFORE(dl, dev, si_clone); 750 else if (de != NULL) 751 LIST_INSERT_AFTER(de, dev, si_clone); 752 else 753 LIST_INSERT_HEAD(&cd->head, dev, si_clone); 754 dev->si_flags |= SI_CLONELIST; 755 *up = unit; 756 return (1); 757} 758 759/* 760 * Kill everything still on the list. The driver should already have 761 * disposed of any softc hung of the dev_t's at this time. 762 */ 763void 764clone_cleanup(struct clonedevs **cdp) 765{ 766 dev_t dev, tdev; 767 struct clonedevs *cd; 768 769 cd = *cdp; 770 if (cd == NULL) 771 return; 772 LIST_FOREACH_SAFE(dev, &cd->head, si_clone, tdev) { 773 KASSERT(dev->si_flags & SI_NAMED, 774 ("Driver has goofed in cloning underways udev %x", dev->si_udev)); 775 destroy_dev(dev); 776 } 777 free(cd, M_DEVBUF); 778 *cdp = NULL; 779} 780 781/* 782 * Helper sysctl for devname(3). We're given a {u}dev_t and return 783 * the name, if any, registered by the device driver. 784 */ 785static int 786sysctl_devname(SYSCTL_HANDLER_ARGS) 787{ 788 int error; 789 udev_t ud; 790 dev_t dev; 791 792 error = SYSCTL_IN(req, &ud, sizeof (ud)); 793 if (error) 794 return (error); 795 if (ud == NOUDEV) 796 return(EINVAL); 797 dev = udev2dev(ud); 798 if (dev == NODEV) 799 error = ENOENT; 800 else 801 error = SYSCTL_OUT(req, dev->si_name, strlen(dev->si_name) + 1); 802 return (error); 803} 804 805SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY, 806 NULL, 0, sysctl_devname, "", "devname(3) handler"); 807