fdisk.c revision 227560
1/* 2 * Mach Operating System 3 * Copyright (c) 1992 Carnegie Mellon University 4 * All Rights Reserved. 5 * 6 * Permission to use, copy, modify and distribute this software and its 7 * documentation is hereby granted, provided that both the copyright 8 * notice and this permission notice appear in all copies of the 9 * software, derivative works or modified versions, and any portions 10 * thereof, and that both notices appear in supporting documentation. 11 * 12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 15 * 16 * Carnegie Mellon requests users of this software to return to 17 * 18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 19 * School of Computer Science 20 * Carnegie Mellon University 21 * Pittsburgh PA 15213-3890 22 * 23 * any improvements or extensions that they make and grant Carnegie Mellon 24 * the rights to redistribute these changes. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: stable/9/sbin/fdisk/fdisk.c 227560 2011-11-16 15:36:53Z ae $"); 29 30#include <sys/disk.h> 31#include <sys/disklabel.h> 32#include <sys/diskmbr.h> 33#include <sys/endian.h> 34#include <sys/param.h> 35#include <sys/stat.h> 36#include <sys/mount.h> 37#include <ctype.h> 38#include <fcntl.h> 39#include <err.h> 40#include <errno.h> 41#include <libgeom.h> 42#include <paths.h> 43#include <regex.h> 44#include <stdint.h> 45#include <stdio.h> 46#include <stdlib.h> 47#include <string.h> 48#include <unistd.h> 49 50int iotest; 51 52#define NO_DISK_SECTORS ((u_int32_t)-1) 53#define NO_TRACK_CYLINDERS 1023 54#define NO_TRACK_HEADS 255 55#define NO_TRACK_SECTORS 63 56#define LBUF 100 57static char lbuf[LBUF]; 58 59/* 60 * 61 * Ported to 386bsd by Julian Elischer Thu Oct 15 20:26:46 PDT 1992 62 * 63 * 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University 64 * Copyright (c) 1989 Robert. V. Baron 65 * Created. 66 */ 67 68#define Decimal(str, ans, tmp, maxval) if (decimal(str, &tmp, ans, maxval)) ans = tmp 69 70#define RoundCyl(x) ((((x) + cylsecs - 1) / cylsecs) * cylsecs) 71 72#define MAX_SEC_SIZE 2048 /* maximum section size that is supported */ 73#define MIN_SEC_SIZE 512 /* the sector size to start sensing at */ 74static int secsize = 0; /* the sensed sector size */ 75 76static char *disk; 77 78static int cyls, sectors, heads, cylsecs, disksecs; 79 80struct mboot { 81 unsigned char *bootinst; /* boot code */ 82 off_t bootinst_size; 83 struct dos_partition parts[NDOSPART]; 84}; 85 86static struct mboot mboot; 87static int fd; 88 89#define ACTIVE 0x80 90 91static uint dos_cyls; 92static uint dos_heads; 93static uint dos_sectors; 94static uint dos_cylsecs; 95 96#define DOSSECT(s,c) ((s & 0x3f) | ((c >> 2) & 0xc0)) 97#define DOSCYL(c) (c & 0xff) 98 99#define MAX_ARGS 10 100 101static int current_line_number; 102 103static int geom_processed = 0; 104static int part_processed = 0; 105static int active_processed = 0; 106 107typedef struct cmd { 108 char cmd; 109 int n_args; 110 struct arg { 111 char argtype; 112 unsigned long arg_val; 113 char * arg_str; 114 } args[MAX_ARGS]; 115} CMD; 116 117static int B_flag = 0; /* replace boot code */ 118static int I_flag = 0; /* use entire disk for FreeBSD */ 119static int a_flag = 0; /* set active partition */ 120static char *b_flag = NULL; /* path to boot code */ 121static int i_flag = 0; /* replace partition data */ 122static int q_flag = 0; /* Be quiet */ 123static int u_flag = 0; /* update partition data */ 124static int s_flag = 0; /* Print a summary and exit */ 125static int t_flag = 0; /* test only */ 126static char *f_flag = NULL; /* Read config info from file */ 127static int v_flag = 0; /* Be verbose */ 128static int print_config_flag = 0; 129 130/* 131 * A list of partition types, probably outdated. 132 */ 133static const char *const part_types[256] = { 134 [0x00] = "unused", 135 [0x01] = "Primary DOS with 12 bit FAT", 136 [0x02] = "XENIX / file system", 137 [0x03] = "XENIX /usr file system", 138 [0x04] = "Primary DOS with 16 bit FAT (< 32MB)", 139 [0x05] = "Extended DOS", 140 [0x06] = "Primary DOS, 16 bit FAT (>= 32MB)", 141 [0x07] = "NTFS, OS/2 HPFS, QNX-2 (16 bit) or Advanced UNIX", 142 [0x08] = "AIX file system or SplitDrive", 143 [0x09] = "AIX boot partition or Coherent", 144 [0x0A] = "OS/2 Boot Manager, OPUS or Coherent swap", 145 [0x0B] = "DOS or Windows 95 with 32 bit FAT", 146 [0x0C] = "DOS or Windows 95 with 32 bit FAT (LBA)", 147 [0x0E] = "Primary 'big' DOS (>= 32MB, LBA)", 148 [0x0F] = "Extended DOS (LBA)", 149 [0x10] = "OPUS", 150 [0x11] = "OS/2 BM: hidden DOS with 12-bit FAT", 151 [0x12] = "Compaq diagnostics", 152 [0x14] = "OS/2 BM: hidden DOS with 16-bit FAT (< 32MB)", 153 [0x16] = "OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB)", 154 [0x17] = "OS/2 BM: hidden IFS (e.g. HPFS)", 155 [0x18] = "AST Windows swapfile", 156 [0x1b] = "ASUS Recovery partition (NTFS)", 157 [0x24] = "NEC DOS", 158 [0x3C] = "PartitionMagic recovery", 159 [0x39] = "plan9", 160 [0x40] = "VENIX 286", 161 [0x41] = "Linux/MINIX (sharing disk with DRDOS)", 162 [0x42] = "SFS or Linux swap (sharing disk with DRDOS)", 163 [0x43] = "Linux native (sharing disk with DRDOS)", 164 [0x4D] = "QNX 4.2 Primary", 165 [0x4E] = "QNX 4.2 Secondary", 166 [0x4F] = "QNX 4.2 Tertiary", 167 [0x50] = "DM (disk manager)", 168 [0x51] = "DM6 Aux1 (or Novell)", 169 [0x52] = "CP/M or Microport SysV/AT", 170 [0x53] = "DM6 Aux3", 171 [0x54] = "DM6", 172 [0x55] = "EZ-Drive (disk manager)", 173 [0x56] = "Golden Bow (disk manager)", 174 [0x5c] = "Priam Edisk (disk manager)", /* according to S. Widlake */ 175 [0x61] = "SpeedStor", 176 [0x63] = "System V/386 (such as ISC UNIX), GNU HURD or Mach", 177 [0x64] = "Novell Netware/286 2.xx", 178 [0x65] = "Novell Netware/386 3.xx", 179 [0x70] = "DiskSecure Multi-Boot", 180 [0x75] = "PCIX", 181 [0x77] = "QNX4.x", 182 [0x78] = "QNX4.x 2nd part", 183 [0x79] = "QNX4.x 3rd part", 184 [0x80] = "Minix until 1.4a", 185 [0x81] = "Minix since 1.4b, early Linux partition or Mitac disk manager", 186 [0x82] = "Linux swap or Solaris x86", 187 [0x83] = "Linux native", 188 [0x84] = "OS/2 hidden C: drive", 189 [0x85] = "Linux extended", 190 [0x86] = "NTFS volume set??", 191 [0x87] = "NTFS volume set??", 192 [0x93] = "Amoeba file system", 193 [0x94] = "Amoeba bad block table", 194 [0x9F] = "BSD/OS", 195 [0xA0] = "Suspend to Disk", 196 [0xA5] = "FreeBSD/NetBSD/386BSD", 197 [0xA6] = "OpenBSD", 198 [0xA7] = "NeXTSTEP", 199 [0xA9] = "NetBSD", 200 [0xAC] = "IBM JFS", 201 [0xAF] = "HFS+", 202 [0xB7] = "BSDI BSD/386 file system", 203 [0xB8] = "BSDI BSD/386 swap", 204 [0xBE] = "Solaris x86 boot", 205 [0xBF] = "Solaris x86 (new)", 206 [0xC1] = "DRDOS/sec with 12-bit FAT", 207 [0xC4] = "DRDOS/sec with 16-bit FAT (< 32MB)", 208 [0xC6] = "DRDOS/sec with 16-bit FAT (>= 32MB)", 209 [0xC7] = "Syrinx", 210 [0xDB] = "CP/M, Concurrent CP/M, Concurrent DOS or CTOS", 211 [0xDE] = "DELL Utilities - FAT filesystem", 212 [0xE1] = "DOS access or SpeedStor with 12-bit FAT extended partition", 213 [0xE3] = "DOS R/O or SpeedStor", 214 [0xE4] = "SpeedStor with 16-bit FAT extended partition < 1024 cyl.", 215 [0xEB] = "BeOS file system", 216 [0xEE] = "EFI GPT", 217 [0xEF] = "EFI System Partition", 218 [0xF1] = "SpeedStor", 219 [0xF2] = "DOS 3.3+ Secondary", 220 [0xF4] = "SpeedStor large partition", 221 [0xFE] = "SpeedStor >1024 cyl. or LANstep", 222 [0xFF] = "Xenix bad blocks table", 223}; 224 225static const char * 226get_type(int t) 227{ 228 const char *ret; 229 230 ret = (t >= 0 && t <= 255) ? part_types[t] : NULL; 231 return ret ? ret : "unknown"; 232} 233 234 235static int geom_class_available(const char *); 236static void print_s0(void); 237static void print_part(const struct dos_partition *); 238static void init_sector0(unsigned long start); 239static void init_boot(void); 240static void change_part(int i); 241static void print_params(void); 242static void change_active(int which); 243static void change_code(void); 244static void get_params_to_use(void); 245static char *get_rootdisk(void); 246static void dos(struct dos_partition *partp); 247static int open_disk(int flag); 248static ssize_t read_disk(off_t sector, void *buf); 249static int write_disk(off_t sector, void *buf); 250static int get_params(void); 251static int read_s0(void); 252static int write_s0(void); 253static int ok(const char *str); 254static int decimal(const char *str, int *num, int deflt, uint32_t maxval); 255static int read_config(char *config_file); 256static void reset_boot(void); 257static int sanitize_partition(struct dos_partition *); 258static void usage(void); 259 260int 261main(int argc, char *argv[]) 262{ 263 int c, i; 264 int partition = -1; 265 struct dos_partition *partp; 266 267 while ((c = getopt(argc, argv, "BIab:f:ipqstuv1234")) != -1) 268 switch (c) { 269 case 'B': 270 B_flag = 1; 271 break; 272 case 'I': 273 I_flag = 1; 274 break; 275 case 'a': 276 a_flag = 1; 277 break; 278 case 'b': 279 b_flag = optarg; 280 break; 281 case 'f': 282 f_flag = optarg; 283 break; 284 case 'i': 285 i_flag = 1; 286 break; 287 case 'p': 288 print_config_flag = 1; 289 break; 290 case 'q': 291 q_flag = 1; 292 break; 293 case 's': 294 s_flag = 1; 295 break; 296 case 't': 297 t_flag = 1; 298 break; 299 case 'u': 300 u_flag = 1; 301 break; 302 case 'v': 303 v_flag = 1; 304 break; 305 case '1': 306 case '2': 307 case '3': 308 case '4': 309 partition = c - '0'; 310 break; 311 default: 312 usage(); 313 } 314 if (f_flag || i_flag) 315 u_flag = 1; 316 if (t_flag) 317 v_flag = 1; 318 argc -= optind; 319 argv += optind; 320 321 if (argc == 0) { 322 disk = get_rootdisk(); 323 } else { 324 disk = g_device_path(argv[0]); 325 if (disk == NULL) 326 err(1, "unable to get correct path for %s", argv[0]); 327 } 328 if (open_disk(u_flag) < 0) 329 err(1, "cannot open disk %s", disk); 330 331 /* (abu)use mboot.bootinst to probe for the sector size */ 332 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL) 333 err(1, "cannot allocate buffer to determine disk sector size"); 334 if (read_disk(0, mboot.bootinst) == -1) 335 errx(1, "could not detect sector size"); 336 free(mboot.bootinst); 337 mboot.bootinst = NULL; 338 339 if (print_config_flag) { 340 if (read_s0()) 341 err(1, "read_s0"); 342 343 printf("# %s\n", disk); 344 printf("g c%d h%d s%d\n", dos_cyls, dos_heads, dos_sectors); 345 346 for (i = 0; i < NDOSPART; i++) { 347 partp = &mboot.parts[i]; 348 349 if (partp->dp_start == 0 && partp->dp_size == 0) 350 continue; 351 352 printf("p %d 0x%02x %lu %lu\n", i + 1, partp->dp_typ, 353 (u_long)partp->dp_start, (u_long)partp->dp_size); 354 355 /* Fill flags for the partition. */ 356 if (partp->dp_flag & 0x80) 357 printf("a %d\n", i + 1); 358 } 359 exit(0); 360 } 361 if (s_flag) { 362 if (read_s0()) 363 err(1, "read_s0"); 364 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads, 365 dos_sectors); 366 printf("Part %11s %11s Type Flags\n", "Start", "Size"); 367 for (i = 0; i < NDOSPART; i++) { 368 partp = &mboot.parts[i]; 369 if (partp->dp_start == 0 && partp->dp_size == 0) 370 continue; 371 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1, 372 (u_long) partp->dp_start, 373 (u_long) partp->dp_size, partp->dp_typ, 374 partp->dp_flag); 375 } 376 exit(0); 377 } 378 379 printf("******* Working on device %s *******\n",disk); 380 381 if (I_flag) { 382 read_s0(); 383 reset_boot(); 384 partp = &mboot.parts[0]; 385 partp->dp_typ = DOSPTYP_386BSD; 386 partp->dp_flag = ACTIVE; 387 partp->dp_start = dos_sectors; 388 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - 389 dos_sectors; 390 dos(partp); 391 if (v_flag) 392 print_s0(); 393 if (!t_flag) 394 write_s0(); 395 exit(0); 396 } 397 if (f_flag) { 398 if (read_s0() || i_flag) 399 reset_boot(); 400 if (!read_config(f_flag)) 401 exit(1); 402 if (v_flag) 403 print_s0(); 404 if (!t_flag) 405 write_s0(); 406 } else { 407 if(u_flag) 408 get_params_to_use(); 409 else 410 print_params(); 411 412 if (read_s0()) 413 init_sector0(dos_sectors); 414 415 printf("Media sector size is %d\n", secsize); 416 printf("Warning: BIOS sector numbering starts with sector 1\n"); 417 printf("Information from DOS bootblock is:\n"); 418 if (partition == -1) 419 for (i = 1; i <= NDOSPART; i++) 420 change_part(i); 421 else 422 change_part(partition); 423 424 if (u_flag || a_flag) 425 change_active(partition); 426 427 if (B_flag) 428 change_code(); 429 430 if (u_flag || a_flag || B_flag) { 431 if (!t_flag) { 432 printf("\nWe haven't changed the partition table yet. "); 433 printf("This is your last chance.\n"); 434 } 435 print_s0(); 436 if (!t_flag) { 437 if (ok("Should we write new partition table?")) 438 write_s0(); 439 } else { 440 printf("\n-t flag specified -- partition table not written.\n"); 441 } 442 } 443 } 444 445 exit(0); 446} 447 448static void 449usage() 450{ 451 fprintf(stderr, "%s%s", 452 "usage: fdisk [-BIaipqstu] [-b bootcode] [-1234] [disk]\n", 453 " fdisk -f configfile [-itv] [disk]\n"); 454 exit(1); 455} 456 457static void 458print_s0(void) 459{ 460 int i; 461 462 print_params(); 463 printf("Information from DOS bootblock is:\n"); 464 for (i = 1; i <= NDOSPART; i++) { 465 printf("%d: ", i); 466 print_part(&mboot.parts[i - 1]); 467 } 468} 469 470static struct dos_partition mtpart; 471 472static void 473print_part(const struct dos_partition *partp) 474{ 475 u_int64_t part_mb; 476 477 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) { 478 printf("<UNUSED>\n"); 479 return; 480 } 481 /* 482 * Be careful not to overflow. 483 */ 484 part_mb = partp->dp_size; 485 part_mb *= secsize; 486 part_mb /= (1024 * 1024); 487 printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ, 488 get_type(partp->dp_typ)); 489 printf(" start %lu, size %lu (%ju Meg), flag %x%s\n", 490 (u_long)partp->dp_start, 491 (u_long)partp->dp_size, 492 (uintmax_t)part_mb, 493 partp->dp_flag, 494 partp->dp_flag == ACTIVE ? " (active)" : ""); 495 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n" 496 ,DPCYL(partp->dp_scyl, partp->dp_ssect) 497 ,partp->dp_shd 498 ,DPSECT(partp->dp_ssect) 499 ,DPCYL(partp->dp_ecyl, partp->dp_esect) 500 ,partp->dp_ehd 501 ,DPSECT(partp->dp_esect)); 502} 503 504 505static void 506init_boot(void) 507{ 508#ifndef __ia64__ 509 const char *fname; 510 int fdesc, n; 511 struct stat sb; 512 513 fname = b_flag ? b_flag : "/boot/mbr"; 514 if ((fdesc = open(fname, O_RDONLY)) == -1 || 515 fstat(fdesc, &sb) == -1) 516 err(1, "%s", fname); 517 if ((mboot.bootinst_size = sb.st_size) % secsize != 0) 518 errx(1, "%s: length must be a multiple of sector size", fname); 519 if (mboot.bootinst != NULL) 520 free(mboot.bootinst); 521 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL) 522 errx(1, "%s: unable to allocate read buffer", fname); 523 if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 || 524 close(fdesc)) 525 err(1, "%s", fname); 526 if (n != mboot.bootinst_size) 527 errx(1, "%s: short read", fname); 528#else 529 if (mboot.bootinst != NULL) 530 free(mboot.bootinst); 531 mboot.bootinst_size = secsize; 532 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) 533 errx(1, "unable to allocate boot block buffer"); 534 memset(mboot.bootinst, 0, mboot.bootinst_size); 535 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 536#endif 537} 538 539 540static void 541init_sector0(unsigned long start) 542{ 543 struct dos_partition *partp = &mboot.parts[0]; 544 545 init_boot(); 546 547 partp->dp_typ = DOSPTYP_386BSD; 548 partp->dp_flag = ACTIVE; 549 start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors; 550 if(start == 0) 551 start = dos_sectors; 552 partp->dp_start = start; 553 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start; 554 555 dos(partp); 556} 557 558static void 559change_part(int i) 560{ 561 struct dos_partition *partp = &mboot.parts[i - 1]; 562 563 printf("The data for partition %d is:\n", i); 564 print_part(partp); 565 566 if (u_flag && ok("Do you want to change it?")) { 567 int tmp; 568 569 if (i_flag) { 570 bzero(partp, sizeof (*partp)); 571 if (i == 1) { 572 init_sector0(1); 573 printf("\nThe static data for the slice 1 has been reinitialized to:\n"); 574 print_part(partp); 575 } 576 } 577 578 do { 579 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp, 255); 580 Decimal("start", partp->dp_start, tmp, NO_DISK_SECTORS); 581 Decimal("size", partp->dp_size, tmp, NO_DISK_SECTORS); 582 if (!sanitize_partition(partp)) { 583 warnx("ERROR: failed to adjust; setting sysid to 0"); 584 partp->dp_typ = 0; 585 } 586 587 if (ok("Explicitly specify beg/end address ?")) 588 { 589 int tsec,tcyl,thd; 590 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect); 591 thd = partp->dp_shd; 592 tsec = DPSECT(partp->dp_ssect); 593 Decimal("beginning cylinder", tcyl, tmp, NO_TRACK_CYLINDERS); 594 Decimal("beginning head", thd, tmp, NO_TRACK_HEADS); 595 Decimal("beginning sector", tsec, tmp, NO_TRACK_SECTORS); 596 partp->dp_scyl = DOSCYL(tcyl); 597 partp->dp_ssect = DOSSECT(tsec,tcyl); 598 partp->dp_shd = thd; 599 600 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect); 601 thd = partp->dp_ehd; 602 tsec = DPSECT(partp->dp_esect); 603 Decimal("ending cylinder", tcyl, tmp, NO_TRACK_CYLINDERS); 604 Decimal("ending head", thd, tmp, NO_TRACK_HEADS); 605 Decimal("ending sector", tsec, tmp, NO_TRACK_SECTORS); 606 partp->dp_ecyl = DOSCYL(tcyl); 607 partp->dp_esect = DOSSECT(tsec,tcyl); 608 partp->dp_ehd = thd; 609 } else 610 dos(partp); 611 612 print_part(partp); 613 } while (!ok("Are we happy with this entry?")); 614 } 615} 616 617static void 618print_params() 619{ 620 printf("parameters extracted from in-core disklabel are:\n"); 621 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 622 ,cyls,heads,sectors,cylsecs); 623 if (dos_cyls > 1023 || dos_heads > 255 || dos_sectors > 63) 624 printf("Figures below won't work with BIOS for partitions not in cyl 1\n"); 625 printf("parameters to be used for BIOS calculations are:\n"); 626 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 627 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs); 628} 629 630static void 631change_active(int which) 632{ 633 struct dos_partition *partp = &mboot.parts[0]; 634 int active, i, new, tmp; 635 636 active = -1; 637 for (i = 0; i < NDOSPART; i++) { 638 if ((partp[i].dp_flag & ACTIVE) == 0) 639 continue; 640 printf("Partition %d is marked active\n", i + 1); 641 if (active == -1) 642 active = i + 1; 643 } 644 if (a_flag && which != -1) 645 active = which; 646 else if (active == -1) 647 active = 1; 648 649 if (!ok("Do you want to change the active partition?")) 650 return; 651setactive: 652 do { 653 new = active; 654 Decimal("active partition", new, tmp, 0); 655 if (new < 1 || new > 4) { 656 printf("Active partition number must be in range 1-4." 657 " Try again.\n"); 658 goto setactive; 659 } 660 active = new; 661 } while (!ok("Are you happy with this choice")); 662 for (i = 0; i < NDOSPART; i++) 663 partp[i].dp_flag = 0; 664 if (active > 0 && active <= NDOSPART) 665 partp[active-1].dp_flag = ACTIVE; 666} 667 668static void 669change_code() 670{ 671 if (ok("Do you want to change the boot code?")) 672 init_boot(); 673} 674 675void 676get_params_to_use() 677{ 678 int tmp; 679 print_params(); 680 if (ok("Do you want to change our idea of what BIOS thinks ?")) 681 { 682 do 683 { 684 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp, 0); 685 Decimal("BIOS's idea of #heads", dos_heads, tmp, 0); 686 Decimal("BIOS's idea of #sectors", dos_sectors, tmp, 0); 687 dos_cylsecs = dos_heads * dos_sectors; 688 print_params(); 689 } 690 while(!ok("Are you happy with this choice")); 691 } 692} 693 694 695/***********************************************\ 696* Change real numbers into strange dos numbers * 697\***********************************************/ 698static void 699dos(struct dos_partition *partp) 700{ 701 int cy, sec; 702 u_int32_t end; 703 704 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) { 705 memcpy(partp, &mtpart, sizeof(*partp)); 706 return; 707 } 708 709 /* Start c/h/s. */ 710 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors; 711 cy = partp->dp_start / dos_cylsecs; 712 sec = partp->dp_start % dos_sectors + 1; 713 partp->dp_scyl = DOSCYL(cy); 714 partp->dp_ssect = DOSSECT(sec, cy); 715 716 /* End c/h/s. */ 717 end = partp->dp_start + partp->dp_size - 1; 718 partp->dp_ehd = end % dos_cylsecs / dos_sectors; 719 cy = end / dos_cylsecs; 720 sec = end % dos_sectors + 1; 721 partp->dp_ecyl = DOSCYL(cy); 722 partp->dp_esect = DOSSECT(sec, cy); 723} 724 725static int 726open_disk(int flag) 727{ 728 int rwmode; 729 730 /* Write mode if one of these flags are set. */ 731 rwmode = (a_flag || I_flag || B_flag || flag); 732 fd = g_open(disk, rwmode); 733 /* If the mode fails, try read-only if we didn't. */ 734 if (fd == -1 && errno == EPERM && rwmode) 735 fd = g_open(disk, 0); 736 if (fd == -1 && errno == ENXIO) 737 return -2; 738 if (fd == -1) { 739 warnx("can't open device %s", disk); 740 return -1; 741 } 742 if (get_params() == -1) { 743 warnx("can't get disk parameters on %s", disk); 744 return -1; 745 } 746 return fd; 747} 748 749static ssize_t 750read_disk(off_t sector, void *buf) 751{ 752 753 lseek(fd, (sector * 512), 0); 754 if (secsize == 0) 755 for (secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; 756 secsize *= 2) { 757 /* try the read */ 758 int size = read(fd, buf, secsize); 759 if (size == secsize) 760 /* it worked so return */ 761 return secsize; 762 } 763 else 764 return read(fd, buf, secsize); 765 766 /* we failed to read at any of the sizes */ 767 return -1; 768} 769 770static int 771geom_class_available(const char *name) 772{ 773 struct gclass *class; 774 struct gmesh mesh; 775 int error; 776 777 error = geom_gettree(&mesh); 778 if (error != 0) 779 errc(1, error, "Cannot get GEOM tree"); 780 781 LIST_FOREACH(class, &mesh.lg_class, lg_class) { 782 if (strcmp(class->lg_name, name) == 0) { 783 geom_deletetree(&mesh); 784 return (1); 785 } 786 } 787 788 geom_deletetree(&mesh); 789 790 return (0); 791} 792 793static int 794write_disk(off_t sector, void *buf) 795{ 796 struct gctl_req *grq; 797 const char *errmsg; 798 char *pname; 799 int error; 800 801 /* Check that GEOM_MBR is available */ 802 if (geom_class_available("MBR") != 0) { 803 grq = gctl_get_handle(); 804 gctl_ro_param(grq, "verb", -1, "write MBR"); 805 gctl_ro_param(grq, "class", -1, "MBR"); 806 pname = g_providername(fd); 807 if (pname == NULL) { 808 warn("Error getting providername for %s", disk); 809 return (-1); 810 } 811 gctl_ro_param(grq, "geom", -1, pname); 812 gctl_ro_param(grq, "data", secsize, buf); 813 errmsg = gctl_issue(grq); 814 free(pname); 815 if (errmsg == NULL) { 816 gctl_free(grq); 817 return(0); 818 } 819 if (!q_flag) 820 warnx("GEOM_MBR: %s", errmsg); 821 gctl_free(grq); 822 } else { 823 /* 824 * Try to write MBR directly. This may help when disk 825 * is not in use. 826 * XXX: hardcoded sectorsize 827 */ 828 error = pwrite(fd, buf, secsize, (sector * 512)); 829 if (error == secsize) 830 return (0); 831 } 832 833 /* 834 * GEOM_MBR is not available or failed to write MBR. 835 * Now check that we have GEOM_PART and recommend to use gpart (8). 836 */ 837 if (geom_class_available("PART") != 0) 838 warnx("Failed to write MBR. Try to use gpart(8)."); 839 else 840 warnx("Failed to write sector zero"); 841 return(EINVAL); 842} 843 844static int 845get_params() 846{ 847 int error; 848 u_int u; 849 off_t o; 850 851 error = ioctl(fd, DIOCGFWSECTORS, &u); 852 if (error == 0) 853 sectors = dos_sectors = u; 854 else 855 sectors = dos_sectors = 63; 856 857 error = ioctl(fd, DIOCGFWHEADS, &u); 858 if (error == 0) 859 heads = dos_heads = u; 860 else 861 heads = dos_heads = 255; 862 863 dos_cylsecs = cylsecs = heads * sectors; 864 disksecs = cyls * heads * sectors; 865 866 u = g_sectorsize(fd); 867 if (u <= 0) 868 return (-1); 869 870 o = g_mediasize(fd); 871 if (o < 0) 872 return (-1); 873 disksecs = o / u; 874 cyls = dos_cyls = o / (u * dos_heads * dos_sectors); 875 876 return (disksecs); 877} 878 879static int 880read_s0() 881{ 882 int i; 883 884 mboot.bootinst_size = secsize; 885 if (mboot.bootinst != NULL) 886 free(mboot.bootinst); 887 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { 888 warnx("unable to allocate buffer to read fdisk " 889 "partition table"); 890 return -1; 891 } 892 if (read_disk(0, mboot.bootinst) == -1) { 893 warnx("can't read fdisk partition table"); 894 return -1; 895 } 896 if (le16dec(&mboot.bootinst[DOSMAGICOFFSET]) != DOSMAGIC) { 897 warnx("invalid fdisk partition table found"); 898 /* So should we initialize things */ 899 return -1; 900 } 901 for (i = 0; i < NDOSPART; i++) 902 dos_partition_dec( 903 &mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 904 &mboot.parts[i]); 905 return 0; 906} 907 908static int 909write_s0() 910{ 911 int sector, i; 912 913 if (iotest) { 914 print_s0(); 915 return 0; 916 } 917 for(i = 0; i < NDOSPART; i++) 918 dos_partition_enc(&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 919 &mboot.parts[i]); 920 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 921 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) 922 if (write_disk(sector, 923 &mboot.bootinst[sector * secsize]) == -1) { 924 warn("can't write fdisk partition table"); 925 return -1; 926 } 927 return(0); 928} 929 930 931static int 932ok(const char *str) 933{ 934 printf("%s [n] ", str); 935 fflush(stdout); 936 if (fgets(lbuf, LBUF, stdin) == NULL) 937 exit(1); 938 lbuf[strlen(lbuf)-1] = 0; 939 940 if (*lbuf && 941 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || 942 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) 943 return 1; 944 else 945 return 0; 946} 947 948static int 949decimal(const char *str, int *num, int deflt, uint32_t maxval) 950{ 951 long long acc; 952 int c; 953 char *cp; 954 955 while (1) { 956 acc = 0; 957 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt); 958 fflush(stdout); 959 if (fgets(lbuf, LBUF, stdin) == NULL) 960 exit(1); 961 lbuf[strlen(lbuf)-1] = 0; 962 963 if (!*lbuf) 964 return 0; 965 966 cp = lbuf; 967 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 968 if (!c) 969 return 0; 970 while ((c = *cp++)) { 971 if (c <= '9' && c >= '0') { 972 if (acc <= maxval || maxval == 0) 973 acc = acc * 10 + c - '0'; 974 } else 975 break; 976 } 977 if (c == ' ' || c == '\t') 978 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 979 if (!c) { 980 if (maxval > 0 && acc > maxval) { 981 acc = maxval; 982 printf("%s exceeds maximum value allowed for " 983 "this field. The value has been reduced " 984 "to %lld\n", lbuf, acc); 985 } 986 *num = acc; 987 return 1; 988 } else 989 printf("%s is an invalid decimal number. Try again.\n", 990 lbuf); 991 } 992} 993 994 995static void 996parse_config_line(char *line, CMD *command) 997{ 998 char *cp, *end; 999 1000 cp = line; 1001 while (1) { 1002 memset(command, 0, sizeof(*command)); 1003 1004 while (isspace(*cp)) ++cp; 1005 if (*cp == '\0' || *cp == '#') 1006 break; 1007 command->cmd = *cp++; 1008 1009 /* 1010 * Parse args 1011 */ 1012 while (1) { 1013 while (isspace(*cp)) ++cp; 1014 if (*cp == '\0') 1015 break; /* eol */ 1016 if (*cp == '#') 1017 break; /* found comment */ 1018 if (isalpha(*cp)) 1019 command->args[command->n_args].argtype = *cp++; 1020 end = NULL; 1021 command->args[command->n_args].arg_val = strtoul(cp, &end, 0); 1022 if (cp == end || (!isspace(*end) && *end != '\0')) { 1023 char ch; 1024 end = cp; 1025 while (!isspace(*end) && *end != '\0') ++end; 1026 ch = *end; *end = '\0'; 1027 command->args[command->n_args].arg_str = strdup(cp); 1028 *end = ch; 1029 } else 1030 command->args[command->n_args].arg_str = NULL; 1031 cp = end; 1032 command->n_args++; 1033 } 1034 break; 1035 } 1036} 1037 1038 1039static int 1040process_geometry(CMD *command) 1041{ 1042 int status = 1, i; 1043 1044 while (1) { 1045 geom_processed = 1; 1046 if (part_processed) { 1047 warnx( 1048 "ERROR line %d: the geometry specification line must occur before\n\ 1049 all partition specifications", 1050 current_line_number); 1051 status = 0; 1052 break; 1053 } 1054 if (command->n_args != 3) { 1055 warnx("ERROR line %d: incorrect number of geometry args", 1056 current_line_number); 1057 status = 0; 1058 break; 1059 } 1060 dos_cyls = 0; 1061 dos_heads = 0; 1062 dos_sectors = 0; 1063 for (i = 0; i < 3; ++i) { 1064 switch (command->args[i].argtype) { 1065 case 'c': 1066 dos_cyls = command->args[i].arg_val; 1067 break; 1068 case 'h': 1069 dos_heads = command->args[i].arg_val; 1070 break; 1071 case 's': 1072 dos_sectors = command->args[i].arg_val; 1073 break; 1074 default: 1075 warnx( 1076 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", 1077 current_line_number, command->args[i].argtype, 1078 command->args[i].argtype); 1079 status = 0; 1080 break; 1081 } 1082 } 1083 if (status == 0) 1084 break; 1085 1086 dos_cylsecs = dos_heads * dos_sectors; 1087 1088 /* 1089 * Do sanity checks on parameter values 1090 */ 1091 if (dos_cyls == 0) { 1092 warnx("ERROR line %d: number of cylinders not specified", 1093 current_line_number); 1094 status = 0; 1095 } 1096 if (dos_cyls > 1024) { 1097 warnx( 1098 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ 1099 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ 1100 is dedicated to FreeBSD)", 1101 current_line_number, dos_cyls); 1102 } 1103 1104 if (dos_heads == 0) { 1105 warnx("ERROR line %d: number of heads not specified", 1106 current_line_number); 1107 status = 0; 1108 } else if (dos_heads > 256) { 1109 warnx("ERROR line %d: number of heads must be within (1-256)", 1110 current_line_number); 1111 status = 0; 1112 } 1113 1114 if (dos_sectors == 0) { 1115 warnx("ERROR line %d: number of sectors not specified", 1116 current_line_number); 1117 status = 0; 1118 } else if (dos_sectors > 63) { 1119 warnx("ERROR line %d: number of sectors must be within (1-63)", 1120 current_line_number); 1121 status = 0; 1122 } 1123 1124 break; 1125 } 1126 return (status); 1127} 1128 1129static u_int32_t 1130str2sectors(const char *str) 1131{ 1132 char *end; 1133 unsigned long val; 1134 1135 val = strtoul(str, &end, 0); 1136 if (str == end || *end == '\0') { 1137 warnx("ERROR line %d: unexpected size: \'%s\'", 1138 current_line_number, str); 1139 return NO_DISK_SECTORS; 1140 } 1141 1142 if (*end == 'K') 1143 val *= 1024UL / secsize; 1144 else if (*end == 'M') 1145 val *= 1024UL * 1024UL / secsize; 1146 else if (*end == 'G') 1147 val *= 1024UL * 1024UL * 1024UL / secsize; 1148 else { 1149 warnx("ERROR line %d: unexpected modifier: %c " 1150 "(not K/M/G)", current_line_number, *end); 1151 return NO_DISK_SECTORS; 1152 } 1153 1154 return val; 1155} 1156 1157static int 1158process_partition(CMD *command) 1159{ 1160 int status = 0, partition; 1161 u_int32_t prev_head_boundary, prev_cyl_boundary; 1162 u_int32_t adj_size, max_end; 1163 struct dos_partition *partp; 1164 1165 while (1) { 1166 part_processed = 1; 1167 if (command->n_args != 4) { 1168 warnx("ERROR line %d: incorrect number of partition args", 1169 current_line_number); 1170 break; 1171 } 1172 partition = command->args[0].arg_val; 1173 if (partition < 1 || partition > 4) { 1174 warnx("ERROR line %d: invalid partition number %d", 1175 current_line_number, partition); 1176 break; 1177 } 1178 partp = &mboot.parts[partition - 1]; 1179 bzero(partp, sizeof (*partp)); 1180 partp->dp_typ = command->args[1].arg_val; 1181 if (command->args[2].arg_str != NULL) { 1182 if (strcmp(command->args[2].arg_str, "*") == 0) { 1183 int i; 1184 partp->dp_start = dos_sectors; 1185 for (i = 1; i < partition; i++) { 1186 struct dos_partition *prev_partp; 1187 prev_partp = ((struct dos_partition *) 1188 &mboot.parts) + i - 1; 1189 if (prev_partp->dp_typ != 0) 1190 partp->dp_start = prev_partp->dp_start + 1191 prev_partp->dp_size; 1192 } 1193 if (partp->dp_start % dos_sectors != 0) { 1194 prev_head_boundary = partp->dp_start / 1195 dos_sectors * dos_sectors; 1196 partp->dp_start = prev_head_boundary + 1197 dos_sectors; 1198 } 1199 } else { 1200 partp->dp_start = str2sectors(command->args[2].arg_str); 1201 if (partp->dp_start == NO_DISK_SECTORS) 1202 break; 1203 } 1204 } else 1205 partp->dp_start = command->args[2].arg_val; 1206 1207 if (command->args[3].arg_str != NULL) { 1208 if (strcmp(command->args[3].arg_str, "*") == 0) 1209 partp->dp_size = ((disksecs / dos_cylsecs) * 1210 dos_cylsecs) - partp->dp_start; 1211 else { 1212 partp->dp_size = str2sectors(command->args[3].arg_str); 1213 if (partp->dp_size == NO_DISK_SECTORS) 1214 break; 1215 } 1216 prev_cyl_boundary = ((partp->dp_start + partp->dp_size) / 1217 dos_cylsecs) * dos_cylsecs; 1218 if (prev_cyl_boundary > partp->dp_start) 1219 partp->dp_size = prev_cyl_boundary - partp->dp_start; 1220 } else 1221 partp->dp_size = command->args[3].arg_val; 1222 1223 max_end = partp->dp_start + partp->dp_size; 1224 1225 if (partp->dp_typ == 0) { 1226 /* 1227 * Get out, the partition is marked as unused. 1228 */ 1229 /* 1230 * Insure that it's unused. 1231 */ 1232 bzero(partp, sizeof(*partp)); 1233 status = 1; 1234 break; 1235 } 1236 1237 /* 1238 * Adjust start upwards, if necessary, to fall on a head boundary. 1239 */ 1240 if (partp->dp_start % dos_sectors != 0) { 1241 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors; 1242 if (max_end < dos_sectors || 1243 prev_head_boundary > max_end - dos_sectors) { 1244 /* 1245 * Can't go past end of partition 1246 */ 1247 warnx( 1248 "ERROR line %d: unable to adjust start of partition %d to fall on\n\ 1249 a head boundary", 1250 current_line_number, partition); 1251 break; 1252 } 1253 warnx( 1254 "WARNING: adjusting start offset of partition %d\n\ 1255 from %u to %u, to fall on a head boundary", 1256 partition, (u_int)partp->dp_start, 1257 (u_int)(prev_head_boundary + dos_sectors)); 1258 partp->dp_start = prev_head_boundary + dos_sectors; 1259 } 1260 1261 /* 1262 * Adjust size downwards, if necessary, to fall on a cylinder 1263 * boundary. 1264 */ 1265 prev_cyl_boundary = 1266 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs; 1267 if (prev_cyl_boundary > partp->dp_start) 1268 adj_size = prev_cyl_boundary - partp->dp_start; 1269 else { 1270 warnx( 1271 "ERROR: could not adjust partition to start on a head boundary\n\ 1272 and end on a cylinder boundary."); 1273 return (0); 1274 } 1275 if (adj_size != partp->dp_size) { 1276 warnx( 1277 "WARNING: adjusting size of partition %d from %u to %u\n\ 1278 to end on a cylinder boundary", 1279 partition, (u_int)partp->dp_size, (u_int)adj_size); 1280 partp->dp_size = adj_size; 1281 } 1282 if (partp->dp_size == 0) { 1283 warnx("ERROR line %d: size of partition %d is zero", 1284 current_line_number, partition); 1285 break; 1286 } 1287 1288 dos(partp); 1289 status = 1; 1290 break; 1291 } 1292 return (status); 1293} 1294 1295 1296static int 1297process_active(CMD *command) 1298{ 1299 int status = 0, partition, i; 1300 struct dos_partition *partp; 1301 1302 while (1) { 1303 active_processed = 1; 1304 if (command->n_args != 1) { 1305 warnx("ERROR line %d: incorrect number of active args", 1306 current_line_number); 1307 status = 0; 1308 break; 1309 } 1310 partition = command->args[0].arg_val; 1311 if (partition < 1 || partition > 4) { 1312 warnx("ERROR line %d: invalid partition number %d", 1313 current_line_number, partition); 1314 break; 1315 } 1316 /* 1317 * Reset active partition 1318 */ 1319 partp = mboot.parts; 1320 for (i = 0; i < NDOSPART; i++) 1321 partp[i].dp_flag = 0; 1322 partp[partition-1].dp_flag = ACTIVE; 1323 1324 status = 1; 1325 break; 1326 } 1327 return (status); 1328} 1329 1330 1331static int 1332process_line(char *line) 1333{ 1334 CMD command; 1335 int status = 1; 1336 1337 while (1) { 1338 parse_config_line(line, &command); 1339 switch (command.cmd) { 1340 case 0: 1341 /* 1342 * Comment or blank line 1343 */ 1344 break; 1345 case 'g': 1346 /* 1347 * Set geometry 1348 */ 1349 status = process_geometry(&command); 1350 break; 1351 case 'p': 1352 status = process_partition(&command); 1353 break; 1354 case 'a': 1355 status = process_active(&command); 1356 break; 1357 default: 1358 status = 0; 1359 break; 1360 } 1361 break; 1362 } 1363 return (status); 1364} 1365 1366 1367static int 1368read_config(char *config_file) 1369{ 1370 FILE *fp = NULL; 1371 int status = 1; 1372 char buf[1010]; 1373 1374 while (1) { 1375 if (strcmp(config_file, "-") != 0) { 1376 /* 1377 * We're not reading from stdin 1378 */ 1379 if ((fp = fopen(config_file, "r")) == NULL) { 1380 status = 0; 1381 break; 1382 } 1383 } else { 1384 fp = stdin; 1385 } 1386 current_line_number = 0; 1387 while (!feof(fp)) { 1388 if (fgets(buf, sizeof(buf), fp) == NULL) 1389 break; 1390 ++current_line_number; 1391 status = process_line(buf); 1392 if (status == 0) 1393 break; 1394 } 1395 break; 1396 } 1397 if (fp) { 1398 /* 1399 * It doesn't matter if we're reading from stdin, as we've reached EOF 1400 */ 1401 fclose(fp); 1402 } 1403 return (status); 1404} 1405 1406 1407static void 1408reset_boot(void) 1409{ 1410 int i; 1411 struct dos_partition *partp; 1412 1413 init_boot(); 1414 for (i = 0; i < 4; ++i) { 1415 partp = &mboot.parts[i]; 1416 bzero(partp, sizeof(*partp)); 1417 } 1418} 1419 1420static int 1421sanitize_partition(struct dos_partition *partp) 1422{ 1423 u_int32_t prev_head_boundary, prev_cyl_boundary; 1424 u_int32_t max_end, size, start; 1425 1426 start = partp->dp_start; 1427 size = partp->dp_size; 1428 max_end = start + size; 1429 /* Only allow a zero size if the partition is being marked unused. */ 1430 if (size == 0) { 1431 if (start == 0 && partp->dp_typ == 0) 1432 return (1); 1433 warnx("ERROR: size of partition is zero"); 1434 return (0); 1435 } 1436 /* Return if no adjustment is necessary. */ 1437 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0) 1438 return (1); 1439 1440 if (start == 0) { 1441 warnx("WARNING: partition overlaps with partition table"); 1442 if (ok("Correct this automatically?")) 1443 start = dos_sectors; 1444 } 1445 if (start % dos_sectors != 0) 1446 warnx("WARNING: partition does not start on a head boundary"); 1447 if ((start +size) % dos_sectors != 0) 1448 warnx("WARNING: partition does not end on a cylinder boundary"); 1449 warnx("WARNING: this may confuse the BIOS or some operating systems"); 1450 if (!ok("Correct this automatically?")) 1451 return (1); 1452 1453 /* 1454 * Adjust start upwards, if necessary, to fall on a head boundary. 1455 */ 1456 if (start % dos_sectors != 0) { 1457 prev_head_boundary = start / dos_sectors * dos_sectors; 1458 if (max_end < dos_sectors || 1459 prev_head_boundary >= max_end - dos_sectors) { 1460 /* 1461 * Can't go past end of partition 1462 */ 1463 warnx( 1464 "ERROR: unable to adjust start of partition to fall on a head boundary"); 1465 return (0); 1466 } 1467 start = prev_head_boundary + dos_sectors; 1468 } 1469 1470 /* 1471 * Adjust size downwards, if necessary, to fall on a cylinder 1472 * boundary. 1473 */ 1474 prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs; 1475 if (prev_cyl_boundary > start) 1476 size = prev_cyl_boundary - start; 1477 else { 1478 warnx("ERROR: could not adjust partition to start on a head boundary\n\ 1479 and end on a cylinder boundary."); 1480 return (0); 1481 } 1482 1483 /* Finally, commit any changes to partp and return. */ 1484 if (start != partp->dp_start) { 1485 warnx("WARNING: adjusting start offset of partition to %u", 1486 (u_int)start); 1487 partp->dp_start = start; 1488 } 1489 if (size != partp->dp_size) { 1490 warnx("WARNING: adjusting size of partition to %u", (u_int)size); 1491 partp->dp_size = size; 1492 } 1493 1494 return (1); 1495} 1496 1497/* 1498 * Try figuring out the root device's canonical disk name. 1499 * The following choices are considered: 1500 * /dev/ad0s1a => /dev/ad0 1501 * /dev/da0a => /dev/da0 1502 * /dev/vinum/root => /dev/vinum/root 1503 * A ".eli" part is removed if it exists (see geli(8)). 1504 * A ".journal" ending is removed if it exists (see gjournal(8)). 1505 */ 1506static char * 1507get_rootdisk(void) 1508{ 1509 struct statfs rootfs; 1510 regex_t re; 1511#define NMATCHES 2 1512 regmatch_t rm[NMATCHES]; 1513 char dev[PATH_MAX], *s; 1514 int rv; 1515 1516 if (statfs("/", &rootfs) == -1) 1517 err(1, "statfs(\"/\")"); 1518 1519 if ((rv = regcomp(&re, "^(/dev/[a-z/]+[0-9]*)([sp][0-9]+)?[a-h]?(\\.journal)?$", 1520 REG_EXTENDED)) != 0) 1521 errx(1, "regcomp() failed (%d)", rv); 1522 strlcpy(dev, rootfs.f_mntfromname, sizeof (dev)); 1523 if ((s = strstr(dev, ".eli")) != NULL) 1524 memmove(s, s+4, strlen(s + 4) + 1); 1525 1526 if ((rv = regexec(&re, dev, NMATCHES, rm, 0)) != 0) 1527 errx(1, 1528"mounted root fs resource doesn't match expectations (regexec returned %d)", 1529 rv); 1530 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL) 1531 errx(1, "out of memory"); 1532 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so, 1533 rm[1].rm_eo - rm[1].rm_so); 1534 s[rm[1].rm_eo - rm[1].rm_so] = 0; 1535 1536 return s; 1537} 1538