1 /* $NetBSD: kern_subr.c,v 1.230 2022/03/19 13:51:35 hannken 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 1.230 2022/03/19 13:51:35 hannken 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 VOP_UNLOCK(vn); 141 error = VOP_IOCTL(vn, DIOCGWEDGEINFO, &wi, FREAD, NOCRED); 142 vn_lock(vn, LK_EXCLUSIVE | LK_RETRY); 143 VOP_CLOSE(vn, FREAD, NOCRED); 144 vput(vn); 145 if (error) { 146 #ifdef DEBUG_WEDGE 147 printf("%s: Get wedge info returned %d\n", device_xname(dv), error); 148 #endif 149 return 0; 150 } 151 return strcmp(wi.dkw_ptype, DKW_PTYPE_SWAP) == 0; 152 } 153 154 /* 155 * Determine the root device and, if instructed to, the root file system. 156 */ 157 158 #ifdef MEMORY_DISK_IS_ROOT 159 int md_is_root = 1; 160 #else 161 int md_is_root = 0; 162 #endif 163 164 /* 165 * The device and partition that we booted from. 166 * 167 * This data might be initialized by MD code, but is defined here. 168 */ 169 device_t booted_device; 170 const char *booted_method; 171 int booted_partition; 172 daddr_t booted_startblk; 173 uint64_t booted_nblks; 174 char *bootspec; 175 176 /* 177 * Use partition letters if it's a disk class but not a wedge or flash. 178 * XXX Check for wedge/flash is kinda gross. 179 */ 180 #define DEV_USES_PARTITIONS(dv) \ 181 (device_class((dv)) == DV_DISK && \ 182 !device_is_a((dv), "dk") && \ 183 !device_is_a((dv), "flash")) 184 185 void 186 setroot(device_t bootdv, int bootpartition) 187 { 188 189 /* 190 * Let bootcode augment "rootspec", ensure that 191 * rootdev is invalid to avoid confusion. 192 */ 193 if (rootspec == NULL) { 194 rootspec = bootspec; 195 rootdev = NODEV; 196 } 197 198 /* 199 * force boot device to md0 200 */ 201 if (md_is_root) 202 setroot_md(&bootdv); 203 204 #ifdef TFTPROOT 205 /* 206 * XXX 207 * if rootspec specifies an interface 208 * sets root_device to that interface 209 * reuses NFS init code to set up network 210 * fetch image into ram disk 211 * 212 * if successful, we change boot device 213 */ 214 if (tftproot_dhcpboot(bootdv) == 0) 215 setroot_md(&bootdv); 216 #endif 217 218 /* 219 * quirk for 220 * evbarm/mini2440 221 * hpcarm 222 * hpcmips 223 * hpcsh 224 * 225 * if rootfstype is set to NFS and the 226 * kernel supports NFS and the boot device 227 * is unknown or not a network interface 228 * -> chose the first network interface you find 229 * 230 * hp300 has similar MD code 231 */ 232 setroot_nfs(bootdv); 233 234 /* 235 * If no bootdv was found by MD code and no 236 * root specified ask the user. 237 */ 238 if (rootspec == NULL && bootdv == NULL) 239 boothowto |= RB_ASKNAME; 240 241 /* 242 * loop until a root device is specified 243 */ 244 do { 245 if (boothowto & RB_ASKNAME) 246 setroot_ask(bootdv, bootpartition); 247 else 248 setroot_root(bootdv, bootpartition); 249 250 if (root_device == NULL) 251 boothowto |= RB_ASKNAME; 252 } while (root_device == NULL); 253 } 254 255 /* 256 * If NFS is specified as the file system, and we found 257 * a DV_DISK boot device (or no boot device at all), then 258 * find a reasonable network interface for "rootspec". 259 */ 260 static void 261 setroot_nfs(device_t dv) 262 { 263 struct vfsops *vops; 264 struct ifnet *ifp; 265 266 vops = vfs_getopsbyname(MOUNT_NFS); 267 if (vops != NULL && strcmp(rootfstype, MOUNT_NFS) == 0 && 268 rootspec == NULL && 269 (dv == NULL || device_class(dv) != DV_IFNET)) { 270 int s = pserialize_read_enter(); 271 IFNET_READER_FOREACH(ifp) { 272 if ((ifp->if_flags & 273 (IFF_LOOPBACK|IFF_POINTOPOINT)) == 0) 274 break; 275 } 276 if (ifp != NULL) { 277 /* 278 * Have a suitable interface; behave as if 279 * the user specified this interface. 280 */ 281 rootspec = (const char *)ifp->if_xname; 282 } 283 pserialize_read_exit(s); 284 } 285 if (vops != NULL) 286 vfs_delref(vops); 287 } 288 289 /* 290 * Change boot device to md0 291 * 292 * md0 only exists when it is opened once. 293 */ 294 static void 295 setroot_md(device_t *dvp) 296 { 297 int md_major; 298 dev_t md_dev; 299 300 md_major = devsw_name2blk("md", NULL, 0); 301 if (md_major >= 0) { 302 md_dev = MAKEDISKDEV(md_major, 0, RAW_PART); 303 if (bdev_open(md_dev, FREAD, S_IFBLK, curlwp) == 0) 304 *dvp = device_find_by_xname("md0"); 305 } 306 } 307 308 static void 309 setroot_ask(device_t bootdv, int bootpartition) 310 { 311 device_t dv, defdumpdv, rootdv, dumpdv; 312 dev_t nrootdev, ndumpdev; 313 struct vfsops *vops; 314 const char *deffsname; 315 int len; 316 char buf[128]; 317 318 for (;;) { 319 printf("root device"); 320 if (bootdv != NULL) { 321 printf(" (default %s", device_xname(bootdv)); 322 if (DEV_USES_PARTITIONS(bootdv)) 323 printf("%c", bootpartition + 'a'); 324 printf(")"); 325 } 326 printf(": "); 327 len = cngetsn(buf, sizeof(buf)); 328 if (len == 0 && bootdv != NULL) { 329 strlcpy(buf, device_xname(bootdv), sizeof(buf)); 330 len = strlen(buf); 331 } 332 if (len > 0 && buf[len - 1] == '*') { 333 buf[--len] = '\0'; 334 dv = getdisk(buf, len, 1, &nrootdev, 0); 335 if (dv != NULL) { 336 rootdv = dv; 337 break; 338 } 339 } 340 dv = getdisk(buf, len, bootpartition, &nrootdev, 0); 341 if (dv != NULL) { 342 rootdv = dv; 343 break; 344 } 345 } 346 rootdev = nrootdev; 347 348 /* 349 * Set up the default dump device. If root is on 350 * a network device or a disk without partitions, 351 * there is no default dump device. 352 */ 353 if (DEV_USES_PARTITIONS(rootdv) == 0) 354 defdumpdv = NULL; 355 else 356 defdumpdv = rootdv; 357 358 ndumpdev = NODEV; 359 for (;;) { 360 printf("dump device"); 361 if (defdumpdv != NULL) { 362 /* 363 * Note, we know it's a disk if we get here. 364 */ 365 printf(" (default %sb)", device_xname(defdumpdv)); 366 } 367 printf(": "); 368 len = cngetsn(buf, sizeof(buf)); 369 if (len == 0) { 370 if (defdumpdv != NULL) { 371 ndumpdev = MAKEDISKDEV(major(nrootdev), 372 DISKUNIT(nrootdev), 1); 373 } 374 dumpdv = defdumpdv; 375 break; 376 } 377 if (len == 4 && strcmp(buf, "none") == 0) { 378 dumpdv = NULL; 379 break; 380 } 381 dv = getdisk(buf, len, 1, &ndumpdev, 1); 382 if (dv != NULL) { 383 dumpdv = dv; 384 break; 385 } 386 } 387 dumpdev = ndumpdev; 388 389 for (vops = LIST_FIRST(&vfs_list); vops != NULL; 390 vops = LIST_NEXT(vops, vfs_list)) { 391 if (vops->vfs_mountroot != NULL && 392 strcmp(rootfstype, vops->vfs_name) == 0) 393 break; 394 } 395 396 if (vops == NULL) { 397 deffsname = "generic"; 398 } else 399 deffsname = vops->vfs_name; 400 401 for (;;) { 402 printf("file system (default %s): ", deffsname); 403 len = cngetsn(buf, sizeof(buf)); 404 if (len == 0) { 405 if (strcmp(deffsname, "generic") == 0) 406 rootfstype = ROOT_FSTYPE_ANY; 407 break; 408 } 409 if (len == 4 && strcmp(buf, "halt") == 0) 410 kern_reboot(RB_HALT, NULL); 411 else if (len == 6 && strcmp(buf, "reboot") == 0) 412 kern_reboot(0, NULL); 413 #if defined(DDB) 414 else if (len == 3 && strcmp(buf, "ddb") == 0) { 415 console_debugger(); 416 } 417 #endif 418 else if (len == 7 && strcmp(buf, "generic") == 0) { 419 rootfstype = ROOT_FSTYPE_ANY; 420 break; 421 } 422 vops = vfs_getopsbyname(buf); 423 if (vops == NULL || vops->vfs_mountroot == NULL) { 424 printf("use one of: generic"); 425 for (vops = LIST_FIRST(&vfs_list); 426 vops != NULL; 427 vops = LIST_NEXT(vops, vfs_list)) { 428 if (vops->vfs_mountroot != NULL) 429 printf(" %s", vops->vfs_name); 430 } 431 if (vops != NULL) 432 vfs_delref(vops); 433 #if defined(DDB) 434 printf(" ddb"); 435 #endif 436 printf(" halt reboot\n"); 437 } else { 438 /* 439 * XXX If *vops gets freed between here and 440 * the call to mountroot(), rootfstype will 441 * point to something unexpected. But in 442 * this case the system will fail anyway. 443 */ 444 rootfstype = vops->vfs_name; 445 vfs_delref(vops); 446 break; 447 } 448 } 449 450 switch (device_class(rootdv)) { 451 case DV_IFNET: 452 case DV_DISK: 453 aprint_normal("root on %s", device_xname(rootdv)); 454 if (DEV_USES_PARTITIONS(rootdv)) 455 aprint_normal("%c", (int)DISKPART(rootdev) + 'a'); 456 break; 457 default: 458 printf("can't determine root device\n"); 459 return; 460 } 461 462 root_device = rootdv; 463 setroot_dump(rootdv, dumpdv); 464 } 465 466 /* 467 * configure 468 * device_t root_device 469 * dev_t rootdev (for disks) 470 * 471 */ 472 static void 473 setroot_root(device_t bootdv, int bootpartition) 474 { 475 device_t rootdv; 476 int majdev; 477 const char *rootdevname; 478 char buf[128]; 479 dev_t nrootdev; 480 481 if (rootspec == NULL) { 482 483 /* 484 * Wildcarded root; use the boot device. 485 */ 486 rootdv = bootdv; 487 488 if (bootdv) 489 majdev = devsw_name2blk(device_xname(bootdv), NULL, 0); 490 else 491 majdev = -1; 492 if (majdev >= 0) { 493 /* 494 * Root is on a disk. `bootpartition' is root, 495 * unless the device does not use partitions. 496 */ 497 if (DEV_USES_PARTITIONS(bootdv)) 498 rootdev = MAKEDISKDEV(majdev, 499 device_unit(bootdv), 500 bootpartition); 501 else 502 rootdev = makedev(majdev, device_unit(bootdv)); 503 } 504 } else { 505 506 /* 507 * `root on <dev> ...' 508 */ 509 510 /* 511 * If rootspec can be parsed, just use it. 512 */ 513 rootdv = parsedisk(rootspec, strlen(rootspec), 0, &nrootdev); 514 if (rootdv != NULL) { 515 rootdev = nrootdev; 516 goto haveroot; 517 } 518 519 /* 520 * Fall back to rootdev, compute rootdv for it 521 */ 522 rootdevname = devsw_blk2name(major(rootdev)); 523 if (rootdevname == NULL) { 524 printf("unknown device major 0x%llx\n", 525 (unsigned long long)rootdev); 526 return; 527 } 528 memset(buf, 0, sizeof(buf)); 529 snprintf(buf, sizeof(buf), "%s%llu", rootdevname, 530 (unsigned long long)DISKUNIT(rootdev)); 531 532 rootdv = finddevice(buf); 533 if (rootdv == NULL) { 534 printf("device %s (0x%llx) not configured\n", 535 buf, (unsigned long long)rootdev); 536 return; 537 } 538 } 539 540 haveroot: 541 switch (device_class(rootdv)) { 542 case DV_IFNET: 543 case DV_DISK: 544 aprint_normal("root on %s", device_xname(rootdv)); 545 if (DEV_USES_PARTITIONS(rootdv)) 546 aprint_normal("%c", (int)DISKPART(rootdev) + 'a'); 547 break; 548 default: 549 printf("can't determine root device\n"); 550 return; 551 } 552 553 root_device = rootdv; 554 setroot_dump(rootdv, NULL); 555 } 556 557 /* 558 * configure 559 * dev_t dumpdev 560 * dev_t dumpcdev 561 * 562 * set to NODEV if device not found 563 */ 564 static void 565 setroot_dump(device_t rootdv, device_t dumpdv) 566 { 567 device_t dv; 568 deviter_t di; 569 const char *dumpdevname; 570 int majdev; 571 char buf[128]; 572 573 /* 574 * Now configure the dump device. 575 * 576 * If we haven't figured out the dump device, do so, with 577 * the following rules: 578 * 579 * (a) We already know dumpdv in the RB_ASKNAME case. 580 * 581 * (b) If dumpspec is set, try to use it. If the device 582 * is not available, punt. 583 * 584 * (c) If dumpspec is not set, the dump device is 585 * wildcarded or unspecified. If the root device 586 * is DV_IFNET, punt. Otherwise, use partition b 587 * of the root device. 588 */ 589 590 if (boothowto & RB_ASKNAME) { /* (a) */ 591 if (dumpdv == NULL) 592 goto nodumpdev; 593 } else if (dumpspec != NULL) { /* (b) */ 594 if (strcmp(dumpspec, "none") == 0 || dumpdev == NODEV) { 595 /* 596 * Operator doesn't want a dump device. 597 * Or looks like they tried to pick a network 598 * device. Oops. 599 */ 600 goto nodumpdev; 601 } 602 603 dumpdevname = devsw_blk2name(major(dumpdev)); 604 if (dumpdevname == NULL) 605 goto nodumpdev; 606 memset(buf, 0, sizeof(buf)); 607 snprintf(buf, sizeof(buf), "%s%llu", dumpdevname, 608 (unsigned long long)DISKUNIT(dumpdev)); 609 610 dumpdv = finddevice(buf); 611 if (dumpdv == NULL) { 612 /* 613 * Device not configured. 614 */ 615 goto nodumpdev; 616 } 617 } else { /* (c) */ 618 if (DEV_USES_PARTITIONS(rootdv) == 0) { 619 for (dv = deviter_first(&di, DEVITER_F_ROOT_FIRST); 620 dv != NULL; 621 dv = deviter_next(&di)) 622 if (isswap(dv)) 623 break; 624 deviter_release(&di); 625 if (dv == NULL) 626 goto nodumpdev; 627 628 majdev = devsw_name2blk(device_xname(dv), NULL, 0); 629 if (majdev < 0) 630 goto nodumpdev; 631 dumpdv = dv; 632 dumpdev = makedev(majdev, device_unit(dumpdv)); 633 } else { 634 dumpdv = rootdv; 635 dumpdev = MAKEDISKDEV(major(rootdev), 636 device_unit(dumpdv), 1); 637 } 638 } 639 640 dumpcdev = devsw_blk2chr(dumpdev); 641 aprint_normal(" dumps on %s", device_xname(dumpdv)); 642 if (DEV_USES_PARTITIONS(dumpdv)) 643 aprint_normal("%c", (int)DISKPART(dumpdev) + 'a'); 644 aprint_normal("\n"); 645 return; 646 647 nodumpdev: 648 dumpdev = NODEV; 649 dumpcdev = NODEV; 650 aprint_normal("\n"); 651 } 652 653 static device_t 654 finddevice(const char *name) 655 { 656 const char *wname; 657 658 if ((wname = getwedgename(name, strlen(name))) != NULL) 659 return dkwedge_find_by_wname(wname); 660 661 return device_find_by_xname(name); 662 } 663 664 static device_t 665 getdisk(const char *str, int len, int defpart, dev_t *devp, int isdump) 666 { 667 device_t dv; 668 deviter_t di; 669 670 if (len == 4 && strcmp(str, "halt") == 0) 671 kern_reboot(RB_HALT, NULL); 672 else if (len == 6 && strcmp(str, "reboot") == 0) 673 kern_reboot(0, NULL); 674 #if defined(DDB) 675 else if (len == 3 && strcmp(str, "ddb") == 0) { 676 console_debugger(); 677 return NULL; 678 } 679 #endif 680 681 if ((dv = parsedisk(str, len, defpart, devp)) == NULL) { 682 printf("use one of:"); 683 for (dv = deviter_first(&di, DEVITER_F_ROOT_FIRST); dv != NULL; 684 dv = deviter_next(&di)) { 685 if (DEV_USES_PARTITIONS(dv)) 686 printf(" %s[a-%c]", device_xname(dv), 687 'a' + MAXPARTITIONS - 1); 688 else if (device_class(dv) == DV_DISK) 689 printf(" %s", device_xname(dv)); 690 if (isdump == 0 && device_class(dv) == DV_IFNET) 691 printf(" %s", device_xname(dv)); 692 } 693 deviter_release(&di); 694 dkwedge_print_wnames(); 695 if (isdump) 696 printf(" none"); 697 #if defined(DDB) 698 printf(" ddb"); 699 #endif 700 printf(" halt reboot\n"); 701 } 702 return dv; 703 } 704 705 static const char * 706 getwedgename(const char *name, int namelen) 707 { 708 const char *wpfx1 = "wedge:"; 709 const char *wpfx2 = "NAME="; 710 const int wpfx1len = strlen(wpfx1); 711 const int wpfx2len = strlen(wpfx2); 712 713 if (namelen > wpfx1len && strncmp(name, wpfx1, wpfx1len) == 0) 714 return name + wpfx1len; 715 716 if (namelen > wpfx2len && strncasecmp(name, wpfx2, wpfx2len) == 0) 717 return name + wpfx2len; 718 719 return NULL; 720 } 721 722 static device_t 723 parsedisk(const char *str, int len, int defpart, dev_t *devp) 724 { 725 device_t dv; 726 const char *wname; 727 char c; 728 int majdev, part; 729 char xname[16]; /* same size as dv_xname */ 730 731 if (len == 0) 732 return (NULL); 733 734 if ((wname = getwedgename(str, len)) != NULL) { 735 if ((dv = dkwedge_find_by_wname(wname)) == NULL) 736 return NULL; 737 part = defpart; 738 goto gotdisk; 739 } 740 741 c = str[len-1]; 742 if (c >= 'a' && c <= ('a' + MAXPARTITIONS - 1)) { 743 part = c - 'a'; 744 len--; 745 if (len > sizeof(xname)-1) 746 return NULL; 747 memcpy(xname, str, len); 748 xname[len] = '\0'; 749 str = xname; 750 } else 751 part = defpart; 752 753 dv = finddevice(str); 754 if (dv != NULL) { 755 if (device_class(dv) == DV_DISK) { 756 gotdisk: 757 majdev = devsw_name2blk(device_xname(dv), NULL, 0); 758 if (majdev < 0) 759 panic("parsedisk"); 760 if (DEV_USES_PARTITIONS(dv)) 761 *devp = MAKEDISKDEV(majdev, device_unit(dv), 762 part); 763 else 764 *devp = makedev(majdev, device_unit(dv)); 765 } 766 767 if (device_class(dv) == DV_IFNET) 768 *devp = NODEV; 769 } 770 771 return (dv); 772 } 773