kern_subr.c revision 1.227
1 /* $NetBSD: kern_subr.c,v 1.227 2019/09/16 00:01:16 manu Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 1998, 1999, 2002, 2007, 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 of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center, and by Luke Mewburn. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1991, 1993 35 * The Regents of the University of California. All rights reserved. 36 * (c) UNIX System Laboratories, Inc. 37 * All or some portions of this file are derived from material licensed 38 * to the University of California by American Telephone and Telegraph 39 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 40 * the permission of UNIX System Laboratories, Inc. 41 * 42 * Copyright (c) 1992, 1993 43 * The Regents of the University of California. All rights reserved. 44 * 45 * This software was developed by the Computer Systems Engineering group 46 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 47 * contributed to Berkeley. 48 * 49 * All advertising materials mentioning features or use of this software 50 * must display the following acknowledgement: 51 * This product includes software developed by the University of 52 * California, Lawrence Berkeley Laboratory. 53 * 54 * Redistribution and use in source and binary forms, with or without 55 * modification, are permitted provided that the following conditions 56 * are met: 57 * 1. Redistributions of source code must retain the above copyright 58 * notice, this list of conditions and the following disclaimer. 59 * 2. Redistributions in binary form must reproduce the above copyright 60 * notice, this list of conditions and the following disclaimer in the 61 * documentation and/or other materials provided with the distribution. 62 * 3. Neither the name of the University nor the names of its contributors 63 * may be used to endorse or promote products derived from this software 64 * without specific prior written permission. 65 * 66 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 67 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 68 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 69 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 70 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 71 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 72 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 73 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 74 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 75 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 76 * SUCH DAMAGE. 77 * 78 * @(#)kern_subr.c 8.4 (Berkeley) 2/14/95 79 */ 80 81 #include <sys/cdefs.h> 82 __KERNEL_RCSID(0, "$NetBSD: kern_subr.c,v 1.227 2019/09/16 00:01:16 manu Exp $"); 83 84 #include "opt_ddb.h" 85 #include "opt_md.h" 86 #include "opt_tftproot.h" 87 88 #include <sys/param.h> 89 #include <sys/systm.h> 90 #include <sys/proc.h> 91 #include <sys/mount.h> 92 #include <sys/device.h> 93 #include <sys/reboot.h> 94 #include <sys/conf.h> 95 #include <sys/disk.h> 96 #include <sys/disklabel.h> 97 #include <sys/queue.h> 98 #include <sys/fcntl.h> 99 #include <sys/kauth.h> 100 #include <sys/stat.h> 101 #include <sys/vnode.h> 102 #include <sys/module.h> 103 104 #include <dev/cons.h> 105 106 #include <net/if.h> 107 108 /* XXX these should eventually move to subr_autoconf.c */ 109 static device_t finddevice(const char *); 110 static device_t getdisk(const char *, int, int, dev_t *, int); 111 static device_t parsedisk(const char *, int, int, dev_t *); 112 static const char *getwedgename(const char *, int); 113 114 static void setroot_nfs(device_t); 115 static void setroot_md(device_t *); 116 static void setroot_ask(device_t, int); 117 static void setroot_root(device_t, int); 118 static void setroot_dump(device_t, device_t); 119 120 121 #ifdef TFTPROOT 122 int tftproot_dhcpboot(device_t); 123 #endif 124 125 dev_t dumpcdev; /* for savecore */ 126 127 static int 128 isswap(device_t dv) 129 { 130 struct dkwedge_info wi; 131 struct vnode *vn; 132 int error; 133 134 if (device_class(dv) != DV_DISK || !device_is_a(dv, "dk")) 135 return 0; 136 137 if ((vn = opendisk(dv)) == NULL) 138 return 0; 139 140 error = VOP_IOCTL(vn, DIOCGWEDGEINFO, &wi, FREAD, NOCRED); 141 VOP_CLOSE(vn, FREAD, NOCRED); 142 vput(vn); 143 if (error) { 144 #ifdef DEBUG_WEDGE 145 printf("%s: Get wedge info returned %d\n", device_xname(dv), error); 146 #endif 147 return 0; 148 } 149 return strcmp(wi.dkw_ptype, DKW_PTYPE_SWAP) == 0; 150 } 151 152 /* 153 * Determine the root device and, if instructed to, the root file system. 154 */ 155 156 #ifdef MEMORY_DISK_IS_ROOT 157 int md_is_root = 1; 158 #else 159 int md_is_root = 0; 160 #endif 161 162 /* 163 * The device and partition that we booted from. 164 * 165 * This data might be initialized by MD code, but is defined here. 166 */ 167 device_t booted_device; 168 const char *booted_method; 169 int booted_partition; 170 daddr_t booted_startblk; 171 uint64_t booted_nblks; 172 char *bootspec; 173 174 /* 175 * Use partition letters if it's a disk class but not a wedge or flash. 176 * XXX Check for wedge/flash is kinda gross. 177 */ 178 #define DEV_USES_PARTITIONS(dv) \ 179 (device_class((dv)) == DV_DISK && \ 180 !device_is_a((dv), "dk") && \ 181 !device_is_a((dv), "flash")) 182 183 void 184 setroot(device_t bootdv, int bootpartition) 185 { 186 187 /* 188 * Let bootcode augment "rootspec", ensure that 189 * rootdev is invalid to avoid confusion. 190 */ 191 if (rootspec == NULL) { 192 rootspec = bootspec; 193 rootdev = NODEV; 194 } 195 196 /* 197 * force boot device to md0 198 */ 199 if (md_is_root) 200 setroot_md(&bootdv); 201 202 #ifdef TFTPROOT 203 /* 204 * XXX 205 * if rootspec specifies an interface 206 * sets root_device to that interface 207 * reuses NFS init code to set up network 208 * fetch image into ram disk 209 * 210 * if successful, we change boot device 211 */ 212 if (tftproot_dhcpboot(bootdv) == 0) 213 setroot_md(&bootdv); 214 #endif 215 216 /* 217 * quirk for 218 * evbarm/mini2440 219 * hpcarm 220 * hpcmips 221 * hpcsh 222 * 223 * if rootfstype is set to NFS and the 224 * kernel supports NFS and the boot device 225 * is unknown or not a network interface 226 * -> chose the first network interface you find 227 * 228 * hp300 has similar MD code 229 */ 230 setroot_nfs(bootdv); 231 232 /* 233 * If no bootdv was found by MD code and no 234 * root specified ask the user. 235 */ 236 if (rootspec == NULL && bootdv == NULL) 237 boothowto |= RB_ASKNAME; 238 239 /* 240 * loop until a root device is specified 241 */ 242 do { 243 if (boothowto & RB_ASKNAME) 244 setroot_ask(bootdv, bootpartition); 245 else 246 setroot_root(bootdv, bootpartition); 247 248 if (root_device == NULL) 249 boothowto |= RB_ASKNAME; 250 } while (root_device == NULL); 251 } 252 253 /* 254 * If NFS is specified as the file system, and we found 255 * a DV_DISK boot device (or no boot device at all), then 256 * find a reasonable network interface for "rootspec". 257 */ 258 static void 259 setroot_nfs(device_t dv) 260 { 261 struct vfsops *vops; 262 struct ifnet *ifp; 263 264 vops = vfs_getopsbyname(MOUNT_NFS); 265 if (vops != NULL && strcmp(rootfstype, MOUNT_NFS) == 0 && 266 rootspec == NULL && 267 (dv == NULL || device_class(dv) != DV_IFNET)) { 268 int s = pserialize_read_enter(); 269 IFNET_READER_FOREACH(ifp) { 270 if ((ifp->if_flags & 271 (IFF_LOOPBACK|IFF_POINTOPOINT)) == 0) 272 break; 273 } 274 if (ifp != NULL) { 275 /* 276 * Have a suitable interface; behave as if 277 * the user specified this interface. 278 */ 279 rootspec = (const char *)ifp->if_xname; 280 } 281 pserialize_read_exit(s); 282 } 283 if (vops != NULL) 284 vfs_delref(vops); 285 } 286 287 /* 288 * Change boot device to md0 289 * 290 * md0 only exists when it is opened once. 291 */ 292 static void 293 setroot_md(device_t *dvp) 294 { 295 int md_major; 296 dev_t md_dev; 297 298 md_major = devsw_name2blk("md", NULL, 0); 299 if (md_major >= 0) { 300 md_dev = MAKEDISKDEV(md_major, 0, RAW_PART); 301 if (bdev_open(md_dev, FREAD, S_IFBLK, curlwp) == 0) 302 *dvp = device_find_by_xname("md0"); 303 } 304 } 305 306 static void 307 setroot_ask(device_t bootdv, int bootpartition) 308 { 309 device_t dv, defdumpdv, rootdv, dumpdv; 310 dev_t nrootdev, ndumpdev; 311 struct vfsops *vops; 312 const char *deffsname; 313 int len; 314 char buf[128]; 315 316 for (;;) { 317 printf("root device"); 318 if (bootdv != NULL) { 319 printf(" (default %s", device_xname(bootdv)); 320 if (DEV_USES_PARTITIONS(bootdv)) 321 printf("%c", bootpartition + 'a'); 322 printf(")"); 323 } 324 printf(": "); 325 len = cngetsn(buf, sizeof(buf)); 326 if (len == 0 && bootdv != NULL) { 327 strlcpy(buf, device_xname(bootdv), sizeof(buf)); 328 len = strlen(buf); 329 } 330 if (len > 0 && buf[len - 1] == '*') { 331 buf[--len] = '\0'; 332 dv = getdisk(buf, len, 1, &nrootdev, 0); 333 if (dv != NULL) { 334 rootdv = dv; 335 break; 336 } 337 } 338 dv = getdisk(buf, len, bootpartition, &nrootdev, 0); 339 if (dv != NULL) { 340 rootdv = dv; 341 break; 342 } 343 } 344 rootdev = nrootdev; 345 346 /* 347 * Set up the default dump device. If root is on 348 * a network device or a disk without partitions, 349 * there is no default dump device. 350 */ 351 if (DEV_USES_PARTITIONS(rootdv) == 0) 352 defdumpdv = NULL; 353 else 354 defdumpdv = rootdv; 355 356 ndumpdev = NODEV; 357 for (;;) { 358 printf("dump device"); 359 if (defdumpdv != NULL) { 360 /* 361 * Note, we know it's a disk if we get here. 362 */ 363 printf(" (default %sb)", device_xname(defdumpdv)); 364 } 365 printf(": "); 366 len = cngetsn(buf, sizeof(buf)); 367 if (len == 0) { 368 if (defdumpdv != NULL) { 369 ndumpdev = MAKEDISKDEV(major(nrootdev), 370 DISKUNIT(nrootdev), 1); 371 } 372 dumpdv = defdumpdv; 373 break; 374 } 375 if (len == 4 && strcmp(buf, "none") == 0) { 376 dumpdv = NULL; 377 break; 378 } 379 dv = getdisk(buf, len, 1, &ndumpdev, 1); 380 if (dv != NULL) { 381 dumpdv = dv; 382 break; 383 } 384 } 385 dumpdev = ndumpdev; 386 387 for (vops = LIST_FIRST(&vfs_list); vops != NULL; 388 vops = LIST_NEXT(vops, vfs_list)) { 389 if (vops->vfs_mountroot != NULL && 390 strcmp(rootfstype, vops->vfs_name) == 0) 391 break; 392 } 393 394 if (vops == NULL) { 395 deffsname = "generic"; 396 } else 397 deffsname = vops->vfs_name; 398 399 for (;;) { 400 printf("file system (default %s): ", deffsname); 401 len = cngetsn(buf, sizeof(buf)); 402 if (len == 0) { 403 if (strcmp(deffsname, "generic") == 0) 404 rootfstype = ROOT_FSTYPE_ANY; 405 break; 406 } 407 if (len == 4 && strcmp(buf, "halt") == 0) 408 cpu_reboot(RB_HALT, NULL); 409 else if (len == 6 && strcmp(buf, "reboot") == 0) 410 cpu_reboot(0, NULL); 411 #if defined(DDB) 412 else if (len == 3 && strcmp(buf, "ddb") == 0) { 413 console_debugger(); 414 } 415 #endif 416 else if (len == 7 && strcmp(buf, "generic") == 0) { 417 rootfstype = ROOT_FSTYPE_ANY; 418 break; 419 } 420 vops = vfs_getopsbyname(buf); 421 if (vops == NULL || vops->vfs_mountroot == NULL) { 422 printf("use one of: generic"); 423 for (vops = LIST_FIRST(&vfs_list); 424 vops != NULL; 425 vops = LIST_NEXT(vops, vfs_list)) { 426 if (vops->vfs_mountroot != NULL) 427 printf(" %s", vops->vfs_name); 428 } 429 if (vops != NULL) 430 vfs_delref(vops); 431 #if defined(DDB) 432 printf(" ddb"); 433 #endif 434 printf(" halt reboot\n"); 435 } else { 436 /* 437 * XXX If *vops gets freed between here and 438 * the call to mountroot(), rootfstype will 439 * point to something unexpected. But in 440 * this case the system will fail anyway. 441 */ 442 rootfstype = vops->vfs_name; 443 vfs_delref(vops); 444 break; 445 } 446 } 447 448 root_device = rootdv; 449 setroot_dump(root_device, dumpdv); 450 } 451 452 /* 453 * configure 454 * device_t root_device 455 * dev_t rootdev (for disks) 456 * 457 */ 458 static void 459 setroot_root(device_t bootdv, int bootpartition) 460 { 461 device_t rootdv; 462 int majdev; 463 const char *rootdevname; 464 char buf[128]; 465 dev_t nrootdev; 466 467 if (rootspec == NULL) { 468 469 /* 470 * Wildcarded root; use the boot device. 471 */ 472 rootdv = bootdv; 473 474 if (bootdv) 475 majdev = devsw_name2blk(device_xname(bootdv), NULL, 0); 476 else 477 majdev = -1; 478 if (majdev >= 0) { 479 /* 480 * Root is on a disk. `bootpartition' is root, 481 * unless the device does not use partitions. 482 */ 483 if (DEV_USES_PARTITIONS(bootdv)) 484 rootdev = MAKEDISKDEV(majdev, 485 device_unit(bootdv), 486 bootpartition); 487 else 488 rootdev = makedev(majdev, device_unit(bootdv)); 489 } 490 } else { 491 492 /* 493 * `root on <dev> ...' 494 */ 495 496 /* 497 * If rootspec can be parsed, just use it. 498 */ 499 rootdv = parsedisk(rootspec, strlen(rootspec), 0, &nrootdev); 500 if (rootdv != NULL) { 501 rootdev = nrootdev; 502 goto haveroot; 503 } 504 505 /* 506 * Fall back to rootdev, compute rootdv for it 507 */ 508 rootdevname = devsw_blk2name(major(rootdev)); 509 if (rootdevname == NULL) { 510 printf("unknown device major 0x%llx\n", 511 (unsigned long long)rootdev); 512 return; 513 } 514 memset(buf, 0, sizeof(buf)); 515 snprintf(buf, sizeof(buf), "%s%llu", rootdevname, 516 (unsigned long long)DISKUNIT(rootdev)); 517 518 rootdv = finddevice(buf); 519 if (rootdv == NULL) { 520 printf("device %s (0x%llx) not configured\n", 521 buf, (unsigned long long)rootdev); 522 return; 523 } 524 } 525 526 haveroot: 527 switch (device_class(rootdv)) { 528 case DV_IFNET: 529 case DV_DISK: 530 aprint_normal("root on %s", device_xname(rootdv)); 531 if (DEV_USES_PARTITIONS(rootdv)) 532 aprint_normal("%c", (int)DISKPART(rootdev) + 'a'); 533 break; 534 default: 535 printf("can't determine root device\n"); 536 return; 537 } 538 539 root_device = rootdv; 540 setroot_dump(rootdv, NULL); 541 } 542 543 /* 544 * configure 545 * dev_t dumpdev 546 * dev_t dumpcdev 547 * 548 * set to NODEV if device not found 549 */ 550 static void 551 setroot_dump(device_t rootdv, device_t dumpdv) 552 { 553 device_t dv; 554 deviter_t di; 555 const char *dumpdevname; 556 int majdev; 557 char buf[128]; 558 559 /* 560 * Now configure the dump device. 561 * 562 * If we haven't figured out the dump device, do so, with 563 * the following rules: 564 * 565 * (a) We already know dumpdv in the RB_ASKNAME case. 566 * 567 * (b) If dumpspec is set, try to use it. If the device 568 * is not available, punt. 569 * 570 * (c) If dumpspec is not set, the dump device is 571 * wildcarded or unspecified. If the root device 572 * is DV_IFNET, punt. Otherwise, use partition b 573 * of the root device. 574 */ 575 576 if (boothowto & RB_ASKNAME) { /* (a) */ 577 if (dumpdv == NULL) 578 goto nodumpdev; 579 } else if (dumpspec != NULL) { /* (b) */ 580 if (strcmp(dumpspec, "none") == 0 || dumpdev == NODEV) { 581 /* 582 * Operator doesn't want a dump device. 583 * Or looks like they tried to pick a network 584 * device. Oops. 585 */ 586 goto nodumpdev; 587 } 588 589 dumpdevname = devsw_blk2name(major(dumpdev)); 590 if (dumpdevname == NULL) 591 goto nodumpdev; 592 memset(buf, 0, sizeof(buf)); 593 snprintf(buf, sizeof(buf), "%s%llu", dumpdevname, 594 (unsigned long long)DISKUNIT(dumpdev)); 595 596 dumpdv = finddevice(buf); 597 if (dumpdv == NULL) { 598 /* 599 * Device not configured. 600 */ 601 goto nodumpdev; 602 } 603 } else { /* (c) */ 604 if (DEV_USES_PARTITIONS(rootdv) == 0) { 605 for (dv = deviter_first(&di, DEVITER_F_ROOT_FIRST); 606 dv != NULL; 607 dv = deviter_next(&di)) 608 if (isswap(dv)) 609 break; 610 deviter_release(&di); 611 if (dv == NULL) 612 goto nodumpdev; 613 614 majdev = devsw_name2blk(device_xname(dv), NULL, 0); 615 if (majdev < 0) 616 goto nodumpdev; 617 dumpdv = dv; 618 dumpdev = makedev(majdev, device_unit(dumpdv)); 619 } else { 620 dumpdv = rootdv; 621 dumpdev = MAKEDISKDEV(major(rootdev), 622 device_unit(dumpdv), 1); 623 } 624 } 625 626 dumpcdev = devsw_blk2chr(dumpdev); 627 aprint_normal(" dumps on %s", device_xname(dumpdv)); 628 if (DEV_USES_PARTITIONS(dumpdv)) 629 aprint_normal("%c", (int)DISKPART(dumpdev) + 'a'); 630 aprint_normal("\n"); 631 return; 632 633 nodumpdev: 634 dumpdev = NODEV; 635 dumpcdev = NODEV; 636 aprint_normal("\n"); 637 } 638 639 static device_t 640 finddevice(const char *name) 641 { 642 const char *wname; 643 644 if ((wname = getwedgename(name, strlen(name))) != NULL) 645 return dkwedge_find_by_wname(wname); 646 647 return device_find_by_xname(name); 648 } 649 650 static device_t 651 getdisk(const char *str, int len, int defpart, dev_t *devp, int isdump) 652 { 653 device_t dv; 654 deviter_t di; 655 656 if (len == 4 && strcmp(str, "halt") == 0) 657 cpu_reboot(RB_HALT, NULL); 658 else if (len == 6 && strcmp(str, "reboot") == 0) 659 cpu_reboot(0, NULL); 660 #if defined(DDB) 661 else if (len == 3 && strcmp(str, "ddb") == 0) { 662 console_debugger(); 663 return NULL; 664 } 665 #endif 666 667 if ((dv = parsedisk(str, len, defpart, devp)) == NULL) { 668 printf("use one of:"); 669 for (dv = deviter_first(&di, DEVITER_F_ROOT_FIRST); dv != NULL; 670 dv = deviter_next(&di)) { 671 if (DEV_USES_PARTITIONS(dv)) 672 printf(" %s[a-%c]", device_xname(dv), 673 'a' + MAXPARTITIONS - 1); 674 else if (device_class(dv) == DV_DISK) 675 printf(" %s", device_xname(dv)); 676 if (isdump == 0 && device_class(dv) == DV_IFNET) 677 printf(" %s", device_xname(dv)); 678 } 679 deviter_release(&di); 680 dkwedge_print_wnames(); 681 if (isdump) 682 printf(" none"); 683 #if defined(DDB) 684 printf(" ddb"); 685 #endif 686 printf(" halt reboot\n"); 687 } 688 return dv; 689 } 690 691 static const char * 692 getwedgename(const char *name, int namelen) 693 { 694 const char *wpfx1 = "wedge:"; 695 const char *wpfx2 = "NAME="; 696 const int wpfx1len = strlen(wpfx1); 697 const int wpfx2len = strlen(wpfx2); 698 699 if (namelen > wpfx1len && strncmp(name, wpfx1, wpfx1len) == 0) 700 return name + wpfx1len; 701 702 if (namelen > wpfx2len && strncasecmp(name, wpfx2, wpfx2len) == 0) 703 return name + wpfx2len; 704 705 return NULL; 706 } 707 708 static device_t 709 parsedisk(const char *str, int len, int defpart, dev_t *devp) 710 { 711 device_t dv; 712 const char *wname; 713 char c; 714 int majdev, part; 715 char xname[16]; /* same size as dv_xname */ 716 717 if (len == 0) 718 return (NULL); 719 720 if ((wname = getwedgename(str, len)) != NULL) { 721 if ((dv = dkwedge_find_by_wname(wname)) == NULL) 722 return NULL; 723 part = defpart; 724 goto gotdisk; 725 } 726 727 c = str[len-1]; 728 if (c >= 'a' && c <= ('a' + MAXPARTITIONS - 1)) { 729 part = c - 'a'; 730 len--; 731 if (len > sizeof(xname)-1) 732 return NULL; 733 memcpy(xname, str, len); 734 xname[len] = '\0'; 735 str = xname; 736 } else 737 part = defpart; 738 739 dv = finddevice(str); 740 if (dv != NULL) { 741 if (device_class(dv) == DV_DISK) { 742 gotdisk: 743 majdev = devsw_name2blk(device_xname(dv), NULL, 0); 744 if (majdev < 0) 745 panic("parsedisk"); 746 if (DEV_USES_PARTITIONS(dv)) 747 *devp = MAKEDISKDEV(majdev, device_unit(dv), 748 part); 749 else 750 *devp = makedev(majdev, device_unit(dv)); 751 } 752 753 if (device_class(dv) == DV_IFNET) 754 *devp = NODEV; 755 } 756 757 return (dv); 758 } 759
Indexes created Tue Sep 23 14:10:03 GMT 2025