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("$FreeBSD$"); 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 50 static int 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 57 static 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 */ 74 static int secsize = 0; /* the sensed sector size */ 75 76 static char *disk; 77 78 static int cyls, sectors, heads, cylsecs, disksecs; 79 80 struct mboot { 81 unsigned char *bootinst; /* boot code */ 82 off_t bootinst_size; 83 struct dos_partition parts[NDOSPART]; 84 }; 85 86 static struct mboot mboot; 87 static int fd; 88 89 #define ACTIVE 0x80 90 91 static uint dos_cyls; 92 static uint dos_heads; 93 static uint dos_sectors; 94 static 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 10 100 101 static int current_line_number; 102 103 static int geom_processed = 0; 104 static int part_processed = 0; 105 static int active_processed = 0; 106 107 typedef 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; 116 117 static int B_flag = 0; /* replace boot code */ 118 static int I_flag = 0; /* use entire disk for FreeBSD */ 119 static int a_flag = 0; /* set active partition */ 120 static char *b_flag = NULL; /* path to boot code */ 121 static int i_flag = 0; /* replace partition data */ 122 static int q_flag = 0; /* Be quiet */ 123 static int u_flag = 0; /* update partition data */ 124 static int s_flag = 0; /* Print a summary and exit */ 125 static int t_flag = 0; /* test only */ 126 static char *f_flag = NULL; /* Read config info from file */ 127 static int v_flag = 0; /* Be verbose */ 128 static int print_config_flag = 0; 129 130 /* 131 * A list of partition types, probably outdated. 132 */ 133 static 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 [0xFB] = "VMware VMFS", 222 [0xFE] = "SpeedStor >1024 cyl. or LANstep", 223 [0xFF] = "Xenix bad blocks table", 224 }; 225 226 static const char * 227 get_type(int t) 228 { 229 const char *ret; 230 231 ret = (t >= 0 && t <= 255) ? part_types[t] : NULL; 232 return ret ? ret : "unknown"; 233 } 234 235 236 static int geom_class_available(const char *); 237 static void print_s0(void); 238 static void print_part(const struct dos_partition *); 239 static void init_sector0(unsigned long start); 240 static void init_boot(void); 241 static void change_part(int i); 242 static void print_params(void); 243 static void change_active(int which); 244 static void change_code(void); 245 static void get_params_to_use(void); 246 static char *get_rootdisk(void); 247 static void dos(struct dos_partition *partp); 248 static int open_disk(int flag); 249 static ssize_t read_disk(off_t sector, void *buf); 250 static int write_disk(off_t sector, void *buf); 251 static int get_params(void); 252 static int read_s0(void); 253 static int write_s0(void); 254 static int ok(const char *str); 255 static int decimal(const char *str, int *num, int deflt, uint32_t maxval); 256 static int read_config(char *config_file); 257 static void reset_boot(void); 258 static int sanitize_partition(struct dos_partition *); 259 static void usage(void); 260 261 int 262 main(int argc, char *argv[]) 263 { 264 int c, i; 265 int partition = -1; 266 struct dos_partition *partp; 267 268 while ((c = getopt(argc, argv, "BIab:f:ipqstuv1234")) != -1) 269 switch (c) { 270 case 'B': 271 B_flag = 1; 272 break; 273 case 'I': 274 I_flag = 1; 275 break; 276 case 'a': 277 a_flag = 1; 278 break; 279 case 'b': 280 b_flag = optarg; 281 break; 282 case 'f': 283 f_flag = optarg; 284 break; 285 case 'i': 286 i_flag = 1; 287 break; 288 case 'p': 289 print_config_flag = 1; 290 break; 291 case 'q': 292 q_flag = 1; 293 break; 294 case 's': 295 s_flag = 1; 296 break; 297 case 't': 298 t_flag = 1; 299 break; 300 case 'u': 301 u_flag = 1; 302 break; 303 case 'v': 304 v_flag = 1; 305 break; 306 case '1': 307 case '2': 308 case '3': 309 case '4': 310 partition = c - '0'; 311 break; 312 default: 313 usage(); 314 } 315 if (f_flag || i_flag) 316 u_flag = 1; 317 if (t_flag) 318 v_flag = 1; 319 argc -= optind; 320 argv += optind; 321 322 if (argc == 0) { 323 disk = get_rootdisk(); 324 } else { 325 disk = g_device_path(argv[0]); 326 if (disk == NULL) 327 err(1, "unable to get correct path for %s", argv[0]); 328 } 329 if (open_disk(u_flag) < 0) 330 err(1, "cannot open disk %s", disk); 331 332 /* (abu)use mboot.bootinst to probe for the sector size */ 333 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL) 334 err(1, "cannot allocate buffer to determine disk sector size"); 335 if (read_disk(0, mboot.bootinst) == -1) 336 errx(1, "could not detect sector size"); 337 free(mboot.bootinst); 338 mboot.bootinst = NULL; 339 340 if (print_config_flag) { 341 if (read_s0()) 342 err(1, "read_s0"); 343 344 printf("# %s\n", disk); 345 printf("g c%d h%d s%d\n", dos_cyls, dos_heads, dos_sectors); 346 347 for (i = 0; i < NDOSPART; i++) { 348 partp = &mboot.parts[i]; 349 350 if (partp->dp_start == 0 && partp->dp_size == 0) 351 continue; 352 353 printf("p %d 0x%02x %lu %lu\n", i + 1, partp->dp_typ, 354 (u_long)partp->dp_start, (u_long)partp->dp_size); 355 356 /* Fill flags for the partition. */ 357 if (partp->dp_flag & 0x80) 358 printf("a %d\n", i + 1); 359 } 360 exit(0); 361 } 362 if (s_flag) { 363 if (read_s0()) 364 err(1, "read_s0"); 365 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads, 366 dos_sectors); 367 printf("Part %11s %11s Type Flags\n", "Start", "Size"); 368 for (i = 0; i < NDOSPART; i++) { 369 partp = &mboot.parts[i]; 370 if (partp->dp_start == 0 && partp->dp_size == 0) 371 continue; 372 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1, 373 (u_long) partp->dp_start, 374 (u_long) partp->dp_size, partp->dp_typ, 375 partp->dp_flag); 376 } 377 exit(0); 378 } 379 380 printf("******* Working on device %s *******\n",disk); 381 382 if (I_flag) { 383 read_s0(); 384 reset_boot(); 385 partp = &mboot.parts[0]; 386 partp->dp_typ = DOSPTYP_386BSD; 387 partp->dp_flag = ACTIVE; 388 partp->dp_start = dos_sectors; 389 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - 390 dos_sectors; 391 dos(partp); 392 if (v_flag) 393 print_s0(); 394 if (!t_flag) 395 write_s0(); 396 exit(0); 397 } 398 if (f_flag) { 399 if (read_s0() || i_flag) 400 reset_boot(); 401 if (!read_config(f_flag)) 402 exit(1); 403 if (v_flag) 404 print_s0(); 405 if (!t_flag) 406 write_s0(); 407 } else { 408 if(u_flag) 409 get_params_to_use(); 410 else 411 print_params(); 412 413 if (read_s0()) 414 init_sector0(dos_sectors); 415 416 printf("Media sector size is %d\n", secsize); 417 printf("Warning: BIOS sector numbering starts with sector 1\n"); 418 printf("Information from DOS bootblock is:\n"); 419 if (partition == -1) 420 for (i = 1; i <= NDOSPART; i++) 421 change_part(i); 422 else 423 change_part(partition); 424 425 if (u_flag || a_flag) 426 change_active(partition); 427 428 if (B_flag) 429 change_code(); 430 431 if (u_flag || a_flag || B_flag) { 432 if (!t_flag) { 433 printf("\nWe haven't changed the partition table yet. "); 434 printf("This is your last chance.\n"); 435 } 436 print_s0(); 437 if (!t_flag) { 438 if (ok("Should we write new partition table?")) 439 write_s0(); 440 } else { 441 printf("\n-t flag specified -- partition table not written.\n"); 442 } 443 } 444 } 445 446 exit(0); 447 } 448 449 static void 450 usage() 451 { 452 fprintf(stderr, "%s%s", 453 "usage: fdisk [-BIaipqstu] [-b bootcode] [-1234] [disk]\n", 454 " fdisk -f configfile [-itv] [disk]\n"); 455 exit(1); 456 } 457 458 static void 459 print_s0(void) 460 { 461 int i; 462 463 print_params(); 464 printf("Information from DOS bootblock is:\n"); 465 for (i = 1; i <= NDOSPART; i++) { 466 printf("%d: ", i); 467 print_part(&mboot.parts[i - 1]); 468 } 469 } 470 471 static struct dos_partition mtpart; 472 473 static void 474 print_part(const struct dos_partition *partp) 475 { 476 u_int64_t part_mb; 477 478 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) { 479 printf("<UNUSED>\n"); 480 return; 481 } 482 /* 483 * Be careful not to overflow. 484 */ 485 part_mb = partp->dp_size; 486 part_mb *= secsize; 487 part_mb /= (1024 * 1024); 488 printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ, 489 get_type(partp->dp_typ)); 490 printf(" start %lu, size %lu (%ju Meg), flag %x%s\n", 491 (u_long)partp->dp_start, 492 (u_long)partp->dp_size, 493 (uintmax_t)part_mb, 494 partp->dp_flag, 495 partp->dp_flag == ACTIVE ? " (active)" : ""); 496 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n" 497 ,DPCYL(partp->dp_scyl, partp->dp_ssect) 498 ,partp->dp_shd 499 ,DPSECT(partp->dp_ssect) 500 ,DPCYL(partp->dp_ecyl, partp->dp_esect) 501 ,partp->dp_ehd 502 ,DPSECT(partp->dp_esect)); 503 } 504 505 506 static void 507 init_boot(void) 508 { 509 #ifndef __ia64__ 510 const char *fname; 511 int fdesc, n; 512 struct stat sb; 513 514 fname = b_flag ? b_flag : "/boot/mbr"; 515 if ((fdesc = open(fname, O_RDONLY)) == -1 || 516 fstat(fdesc, &sb) == -1) 517 err(1, "%s", fname); 518 if (sb.st_size == 0) 519 errx(1, "%s is empty, must not be.", fname); 520 if ((mboot.bootinst_size = sb.st_size) % secsize != 0) 521 errx(1, "%s: length must be a multiple of sector size", fname); 522 if (mboot.bootinst != NULL) 523 free(mboot.bootinst); 524 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL) 525 errx(1, "%s: unable to allocate read buffer", fname); 526 if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 || 527 close(fdesc)) 528 err(1, "%s", fname); 529 if (n != mboot.bootinst_size) 530 errx(1, "%s: short read", fname); 531 #else 532 if (mboot.bootinst != NULL) 533 free(mboot.bootinst); 534 mboot.bootinst_size = secsize; 535 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) 536 errx(1, "unable to allocate boot block buffer"); 537 memset(mboot.bootinst, 0, mboot.bootinst_size); 538 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 539 #endif 540 } 541 542 543 static void 544 init_sector0(unsigned long start) 545 { 546 struct dos_partition *partp = &mboot.parts[0]; 547 548 init_boot(); 549 550 partp->dp_typ = DOSPTYP_386BSD; 551 partp->dp_flag = ACTIVE; 552 start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors; 553 if(start == 0) 554 start = dos_sectors; 555 partp->dp_start = start; 556 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start; 557 558 dos(partp); 559 } 560 561 static void 562 change_part(int i) 563 { 564 struct dos_partition *partp = &mboot.parts[i - 1]; 565 566 printf("The data for partition %d is:\n", i); 567 print_part(partp); 568 569 if (u_flag && ok("Do you want to change it?")) { 570 int tmp; 571 572 if (i_flag) { 573 bzero(partp, sizeof (*partp)); 574 if (i == 1) { 575 init_sector0(1); 576 printf("\nThe static data for the slice 1 has been reinitialized to:\n"); 577 print_part(partp); 578 } 579 } 580 581 do { 582 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp, 255); 583 Decimal("start", partp->dp_start, tmp, NO_DISK_SECTORS); 584 Decimal("size", partp->dp_size, tmp, NO_DISK_SECTORS); 585 if (!sanitize_partition(partp)) { 586 warnx("ERROR: failed to adjust; setting sysid to 0"); 587 partp->dp_typ = 0; 588 } 589 590 if (ok("Explicitly specify beg/end address ?")) 591 { 592 int tsec,tcyl,thd; 593 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect); 594 thd = partp->dp_shd; 595 tsec = DPSECT(partp->dp_ssect); 596 Decimal("beginning cylinder", tcyl, tmp, NO_TRACK_CYLINDERS); 597 Decimal("beginning head", thd, tmp, NO_TRACK_HEADS); 598 Decimal("beginning sector", tsec, tmp, NO_TRACK_SECTORS); 599 partp->dp_scyl = DOSCYL(tcyl); 600 partp->dp_ssect = DOSSECT(tsec,tcyl); 601 partp->dp_shd = thd; 602 603 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect); 604 thd = partp->dp_ehd; 605 tsec = DPSECT(partp->dp_esect); 606 Decimal("ending cylinder", tcyl, tmp, NO_TRACK_CYLINDERS); 607 Decimal("ending head", thd, tmp, NO_TRACK_HEADS); 608 Decimal("ending sector", tsec, tmp, NO_TRACK_SECTORS); 609 partp->dp_ecyl = DOSCYL(tcyl); 610 partp->dp_esect = DOSSECT(tsec,tcyl); 611 partp->dp_ehd = thd; 612 } else 613 dos(partp); 614 615 print_part(partp); 616 } while (!ok("Are we happy with this entry?")); 617 } 618 } 619 620 static void 621 print_params() 622 { 623 printf("parameters extracted from in-core disklabel are:\n"); 624 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 625 ,cyls,heads,sectors,cylsecs); 626 if (dos_cyls > 1023 || dos_heads > 255 || dos_sectors > 63) 627 printf("Figures below won't work with BIOS for partitions not in cyl 1\n"); 628 printf("parameters to be used for BIOS calculations are:\n"); 629 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n" 630 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs); 631 } 632 633 static void 634 change_active(int which) 635 { 636 struct dos_partition *partp = &mboot.parts[0]; 637 int active, i, new, tmp; 638 639 active = -1; 640 for (i = 0; i < NDOSPART; i++) { 641 if ((partp[i].dp_flag & ACTIVE) == 0) 642 continue; 643 printf("Partition %d is marked active\n", i + 1); 644 if (active == -1) 645 active = i + 1; 646 } 647 if (a_flag && which != -1) 648 active = which; 649 else if (active == -1) 650 active = 1; 651 652 if (!ok("Do you want to change the active partition?")) 653 return; 654 setactive: 655 do { 656 new = active; 657 Decimal("active partition", new, tmp, 0); 658 if (new < 1 || new > 4) { 659 printf("Active partition number must be in range 1-4." 660 " Try again.\n"); 661 goto setactive; 662 } 663 active = new; 664 } while (!ok("Are you happy with this choice")); 665 for (i = 0; i < NDOSPART; i++) 666 partp[i].dp_flag = 0; 667 if (active > 0 && active <= NDOSPART) 668 partp[active-1].dp_flag = ACTIVE; 669 } 670 671 static void 672 change_code() 673 { 674 if (ok("Do you want to change the boot code?")) 675 init_boot(); 676 } 677 678 void 679 get_params_to_use() 680 { 681 int tmp; 682 print_params(); 683 if (ok("Do you want to change our idea of what BIOS thinks ?")) 684 { 685 do 686 { 687 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp, 0); 688 Decimal("BIOS's idea of #heads", dos_heads, tmp, 0); 689 Decimal("BIOS's idea of #sectors", dos_sectors, tmp, 0); 690 dos_cylsecs = dos_heads * dos_sectors; 691 print_params(); 692 } 693 while(!ok("Are you happy with this choice")); 694 } 695 } 696 697 698 /***********************************************\ 699 * Change real numbers into strange dos numbers * 700 \***********************************************/ 701 static void 702 dos(struct dos_partition *partp) 703 { 704 int cy, sec; 705 u_int32_t end; 706 707 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) { 708 memcpy(partp, &mtpart, sizeof(*partp)); 709 return; 710 } 711 712 /* Start c/h/s. */ 713 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors; 714 cy = partp->dp_start / dos_cylsecs; 715 sec = partp->dp_start % dos_sectors + 1; 716 partp->dp_scyl = DOSCYL(cy); 717 partp->dp_ssect = DOSSECT(sec, cy); 718 719 /* End c/h/s. */ 720 end = partp->dp_start + partp->dp_size - 1; 721 partp->dp_ehd = end % dos_cylsecs / dos_sectors; 722 cy = end / dos_cylsecs; 723 sec = end % dos_sectors + 1; 724 partp->dp_ecyl = DOSCYL(cy); 725 partp->dp_esect = DOSSECT(sec, cy); 726 } 727 728 static int 729 open_disk(int flag) 730 { 731 int rwmode; 732 733 /* Write mode if one of these flags are set. */ 734 rwmode = (a_flag || I_flag || B_flag || flag); 735 fd = g_open(disk, rwmode); 736 /* If the mode fails, try read-only if we didn't. */ 737 if (fd == -1 && errno == EPERM && rwmode) 738 fd = g_open(disk, 0); 739 if (fd == -1 && errno == ENXIO) 740 return -2; 741 if (fd == -1) { 742 warnx("can't open device %s", disk); 743 return -1; 744 } 745 if (get_params() == -1) { 746 warnx("can't get disk parameters on %s", disk); 747 return -1; 748 } 749 return fd; 750 } 751 752 static ssize_t 753 read_disk(off_t sector, void *buf) 754 { 755 756 lseek(fd, (sector * 512), 0); 757 if (secsize == 0) 758 for (secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; 759 secsize *= 2) { 760 /* try the read */ 761 int size = read(fd, buf, secsize); 762 if (size == secsize) 763 /* it worked so return */ 764 return secsize; 765 } 766 else 767 return read(fd, buf, secsize); 768 769 /* we failed to read at any of the sizes */ 770 return -1; 771 } 772 773 static int 774 geom_class_available(const char *name) 775 { 776 struct gclass *class; 777 struct gmesh mesh; 778 int error; 779 780 error = geom_gettree(&mesh); 781 if (error != 0) 782 errc(1, error, "Cannot get GEOM tree"); 783 784 LIST_FOREACH(class, &mesh.lg_class, lg_class) { 785 if (strcmp(class->lg_name, name) == 0) { 786 geom_deletetree(&mesh); 787 return (1); 788 } 789 } 790 791 geom_deletetree(&mesh); 792 793 return (0); 794 } 795 796 static int 797 write_disk(off_t sector, void *buf) 798 { 799 struct gctl_req *grq; 800 const char *errmsg; 801 char *pname; 802 int error; 803 804 /* Check that GEOM_MBR is available */ 805 if (geom_class_available("MBR") != 0) { 806 grq = gctl_get_handle(); 807 gctl_ro_param(grq, "verb", -1, "write MBR"); 808 gctl_ro_param(grq, "class", -1, "MBR"); 809 pname = g_providername(fd); 810 if (pname == NULL) { 811 warn("Error getting providername for %s", disk); 812 return (-1); 813 } 814 gctl_ro_param(grq, "geom", -1, pname); 815 gctl_ro_param(grq, "data", secsize, buf); 816 errmsg = gctl_issue(grq); 817 free(pname); 818 if (errmsg == NULL) { 819 gctl_free(grq); 820 return(0); 821 } 822 if (!q_flag) 823 warnx("GEOM_MBR: %s", errmsg); 824 gctl_free(grq); 825 } else { 826 /* 827 * Try to write MBR directly. This may help when disk 828 * is not in use. 829 * XXX: hardcoded sectorsize 830 */ 831 error = pwrite(fd, buf, secsize, (sector * 512)); 832 if (error == secsize) 833 return (0); 834 } 835 836 /* 837 * GEOM_MBR is not available or failed to write MBR. 838 * Now check that we have GEOM_PART and recommend to use gpart (8). 839 */ 840 if (geom_class_available("PART") != 0) 841 warnx("Failed to write MBR. Try to use gpart(8)."); 842 else 843 warnx("Failed to write sector zero"); 844 return(EINVAL); 845 } 846 847 static int 848 get_params() 849 { 850 int error; 851 u_int u; 852 off_t o; 853 854 error = ioctl(fd, DIOCGFWSECTORS, &u); 855 if (error == 0) 856 sectors = dos_sectors = u; 857 else 858 sectors = dos_sectors = 63; 859 860 error = ioctl(fd, DIOCGFWHEADS, &u); 861 if (error == 0) 862 heads = dos_heads = u; 863 else 864 heads = dos_heads = 255; 865 866 dos_cylsecs = cylsecs = heads * sectors; 867 disksecs = cyls * heads * sectors; 868 869 u = g_sectorsize(fd); 870 if (u <= 0) 871 return (-1); 872 873 o = g_mediasize(fd); 874 if (o < 0) 875 return (-1); 876 disksecs = o / u; 877 cyls = dos_cyls = o / (u * dos_heads * dos_sectors); 878 879 return (disksecs); 880 } 881 882 static int 883 read_s0() 884 { 885 int i; 886 887 mboot.bootinst_size = secsize; 888 if (mboot.bootinst != NULL) 889 free(mboot.bootinst); 890 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) { 891 warnx("unable to allocate buffer to read fdisk " 892 "partition table"); 893 return -1; 894 } 895 if (read_disk(0, mboot.bootinst) == -1) { 896 warnx("can't read fdisk partition table"); 897 return -1; 898 } 899 if (le16dec(&mboot.bootinst[DOSMAGICOFFSET]) != DOSMAGIC) { 900 warnx("invalid fdisk partition table found"); 901 /* So should we initialize things */ 902 return -1; 903 } 904 for (i = 0; i < NDOSPART; i++) 905 dos_partition_dec( 906 &mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 907 &mboot.parts[i]); 908 return 0; 909 } 910 911 static int 912 write_s0() 913 { 914 int sector, i; 915 916 if (iotest) { 917 print_s0(); 918 return 0; 919 } 920 for(i = 0; i < NDOSPART; i++) 921 dos_partition_enc(&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE], 922 &mboot.parts[i]); 923 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC); 924 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++) 925 if (write_disk(sector, 926 &mboot.bootinst[sector * secsize]) == -1) { 927 warn("can't write fdisk partition table"); 928 return -1; 929 } 930 return(0); 931 } 932 933 934 static int 935 ok(const char *str) 936 { 937 printf("%s [n] ", str); 938 fflush(stdout); 939 if (fgets(lbuf, LBUF, stdin) == NULL) 940 exit(1); 941 lbuf[strlen(lbuf)-1] = 0; 942 943 if (*lbuf && 944 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") || 945 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y"))) 946 return 1; 947 else 948 return 0; 949 } 950 951 static int 952 decimal(const char *str, int *num, int deflt, uint32_t maxval) 953 { 954 long long acc; 955 int c; 956 char *cp; 957 958 while (1) { 959 acc = 0; 960 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt); 961 fflush(stdout); 962 if (fgets(lbuf, LBUF, stdin) == NULL) 963 exit(1); 964 lbuf[strlen(lbuf)-1] = 0; 965 966 if (!*lbuf) 967 return 0; 968 969 cp = lbuf; 970 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 971 if (!c) 972 return 0; 973 while ((c = *cp++)) { 974 if (c <= '9' && c >= '0') { 975 if (acc <= maxval || maxval == 0) 976 acc = acc * 10 + c - '0'; 977 } else 978 break; 979 } 980 if (c == ' ' || c == '\t') 981 while ((c = *cp) && (c == ' ' || c == '\t')) cp++; 982 if (!c) { 983 if (maxval > 0 && acc > maxval) { 984 acc = maxval; 985 printf("%s exceeds maximum value allowed for " 986 "this field. The value has been reduced " 987 "to %lld\n", lbuf, acc); 988 } 989 *num = acc; 990 return 1; 991 } else 992 printf("%s is an invalid decimal number. Try again.\n", 993 lbuf); 994 } 995 } 996 997 998 static void 999 parse_config_line(char *line, CMD *command) 1000 { 1001 char *cp, *end; 1002 1003 cp = line; 1004 while (1) { 1005 memset(command, 0, sizeof(*command)); 1006 1007 while (isspace(*cp)) ++cp; 1008 if (*cp == '\0' || *cp == '#') 1009 break; 1010 command->cmd = *cp++; 1011 1012 /* 1013 * Parse args 1014 */ 1015 while (1) { 1016 while (isspace(*cp)) ++cp; 1017 if (*cp == '\0') 1018 break; /* eol */ 1019 if (*cp == '#') 1020 break; /* found comment */ 1021 if (isalpha(*cp)) 1022 command->args[command->n_args].argtype = *cp++; 1023 end = NULL; 1024 command->args[command->n_args].arg_val = strtoul(cp, &end, 0); 1025 if (cp == end || (!isspace(*end) && *end != '\0')) { 1026 char ch; 1027 end = cp; 1028 while (!isspace(*end) && *end != '\0') ++end; 1029 ch = *end; *end = '\0'; 1030 command->args[command->n_args].arg_str = strdup(cp); 1031 *end = ch; 1032 } else 1033 command->args[command->n_args].arg_str = NULL; 1034 cp = end; 1035 command->n_args++; 1036 } 1037 break; 1038 } 1039 } 1040 1041 1042 static int 1043 process_geometry(CMD *command) 1044 { 1045 int status = 1, i; 1046 1047 while (1) { 1048 geom_processed = 1; 1049 if (part_processed) { 1050 warnx( 1051 "ERROR line %d: the geometry specification line must occur before\n\ 1052 all partition specifications", 1053 current_line_number); 1054 status = 0; 1055 break; 1056 } 1057 if (command->n_args != 3) { 1058 warnx("ERROR line %d: incorrect number of geometry args", 1059 current_line_number); 1060 status = 0; 1061 break; 1062 } 1063 dos_cyls = 0; 1064 dos_heads = 0; 1065 dos_sectors = 0; 1066 for (i = 0; i < 3; ++i) { 1067 switch (command->args[i].argtype) { 1068 case 'c': 1069 dos_cyls = command->args[i].arg_val; 1070 break; 1071 case 'h': 1072 dos_heads = command->args[i].arg_val; 1073 break; 1074 case 's': 1075 dos_sectors = command->args[i].arg_val; 1076 break; 1077 default: 1078 warnx( 1079 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)", 1080 current_line_number, command->args[i].argtype, 1081 command->args[i].argtype); 1082 status = 0; 1083 break; 1084 } 1085 } 1086 if (status == 0) 1087 break; 1088 1089 dos_cylsecs = dos_heads * dos_sectors; 1090 1091 /* 1092 * Do sanity checks on parameter values 1093 */ 1094 if (dos_cyls == 0) { 1095 warnx("ERROR line %d: number of cylinders not specified", 1096 current_line_number); 1097 status = 0; 1098 } 1099 if (dos_cyls > 1024) { 1100 warnx( 1101 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\ 1102 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\ 1103 is dedicated to FreeBSD)", 1104 current_line_number, dos_cyls); 1105 } 1106 1107 if (dos_heads == 0) { 1108 warnx("ERROR line %d: number of heads not specified", 1109 current_line_number); 1110 status = 0; 1111 } else if (dos_heads > 256) { 1112 warnx("ERROR line %d: number of heads must be within (1-256)", 1113 current_line_number); 1114 status = 0; 1115 } 1116 1117 if (dos_sectors == 0) { 1118 warnx("ERROR line %d: number of sectors not specified", 1119 current_line_number); 1120 status = 0; 1121 } else if (dos_sectors > 63) { 1122 warnx("ERROR line %d: number of sectors must be within (1-63)", 1123 current_line_number); 1124 status = 0; 1125 } 1126 1127 break; 1128 } 1129 return (status); 1130 } 1131 1132 static u_int32_t 1133 str2sectors(const char *str) 1134 { 1135 char *end; 1136 unsigned long val; 1137 1138 val = strtoul(str, &end, 0); 1139 if (str == end || *end == '\0') { 1140 warnx("ERROR line %d: unexpected size: \'%s\'", 1141 current_line_number, str); 1142 return NO_DISK_SECTORS; 1143 } 1144 1145 if (*end == 'K') 1146 val *= 1024UL / secsize; 1147 else if (*end == 'M') 1148 val *= 1024UL * 1024UL / secsize; 1149 else if (*end == 'G') 1150 val *= 1024UL * 1024UL * 1024UL / secsize; 1151 else { 1152 warnx("ERROR line %d: unexpected modifier: %c " 1153 "(not K/M/G)", current_line_number, *end); 1154 return NO_DISK_SECTORS; 1155 } 1156 1157 return val; 1158 } 1159 1160 static int 1161 process_partition(CMD *command) 1162 { 1163 int status = 0, partition; 1164 u_int32_t prev_head_boundary, prev_cyl_boundary; 1165 u_int32_t adj_size, max_end; 1166 struct dos_partition *partp; 1167 1168 while (1) { 1169 part_processed = 1; 1170 if (command->n_args != 4) { 1171 warnx("ERROR line %d: incorrect number of partition args", 1172 current_line_number); 1173 break; 1174 } 1175 partition = command->args[0].arg_val; 1176 if (partition < 1 || partition > 4) { 1177 warnx("ERROR line %d: invalid partition number %d", 1178 current_line_number, partition); 1179 break; 1180 } 1181 partp = &mboot.parts[partition - 1]; 1182 bzero(partp, sizeof (*partp)); 1183 partp->dp_typ = command->args[1].arg_val; 1184 if (command->args[2].arg_str != NULL) { 1185 if (strcmp(command->args[2].arg_str, "*") == 0) { 1186 int i; 1187 partp->dp_start = dos_sectors; 1188 for (i = 1; i < partition; i++) { 1189 struct dos_partition *prev_partp; 1190 prev_partp = ((struct dos_partition *) 1191 &mboot.parts) + i - 1; 1192 if (prev_partp->dp_typ != 0) 1193 partp->dp_start = prev_partp->dp_start + 1194 prev_partp->dp_size; 1195 } 1196 if (partp->dp_start % dos_sectors != 0) { 1197 prev_head_boundary = partp->dp_start / 1198 dos_sectors * dos_sectors; 1199 partp->dp_start = prev_head_boundary + 1200 dos_sectors; 1201 } 1202 } else { 1203 partp->dp_start = str2sectors(command->args[2].arg_str); 1204 if (partp->dp_start == NO_DISK_SECTORS) 1205 break; 1206 } 1207 } else 1208 partp->dp_start = command->args[2].arg_val; 1209 1210 if (command->args[3].arg_str != NULL) { 1211 if (strcmp(command->args[3].arg_str, "*") == 0) 1212 partp->dp_size = ((disksecs / dos_cylsecs) * 1213 dos_cylsecs) - partp->dp_start; 1214 else { 1215 partp->dp_size = str2sectors(command->args[3].arg_str); 1216 if (partp->dp_size == NO_DISK_SECTORS) 1217 break; 1218 } 1219 prev_cyl_boundary = ((partp->dp_start + partp->dp_size) / 1220 dos_cylsecs) * dos_cylsecs; 1221 if (prev_cyl_boundary > partp->dp_start) 1222 partp->dp_size = prev_cyl_boundary - partp->dp_start; 1223 } else 1224 partp->dp_size = command->args[3].arg_val; 1225 1226 max_end = partp->dp_start + partp->dp_size; 1227 1228 if (partp->dp_typ == 0) { 1229 /* 1230 * Get out, the partition is marked as unused. 1231 */ 1232 /* 1233 * Insure that it's unused. 1234 */ 1235 bzero(partp, sizeof(*partp)); 1236 status = 1; 1237 break; 1238 } 1239 1240 /* 1241 * Adjust start upwards, if necessary, to fall on a head boundary. 1242 */ 1243 if (partp->dp_start % dos_sectors != 0) { 1244 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors; 1245 if (max_end < dos_sectors || 1246 prev_head_boundary > max_end - dos_sectors) { 1247 /* 1248 * Can't go past end of partition 1249 */ 1250 warnx( 1251 "ERROR line %d: unable to adjust start of partition %d to fall on\n\ 1252 a head boundary", 1253 current_line_number, partition); 1254 break; 1255 } 1256 warnx( 1257 "WARNING: adjusting start offset of partition %d\n\ 1258 from %u to %u, to fall on a head boundary", 1259 partition, (u_int)partp->dp_start, 1260 (u_int)(prev_head_boundary + dos_sectors)); 1261 partp->dp_start = prev_head_boundary + dos_sectors; 1262 } 1263 1264 /* 1265 * Adjust size downwards, if necessary, to fall on a cylinder 1266 * boundary. 1267 */ 1268 prev_cyl_boundary = 1269 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs; 1270 if (prev_cyl_boundary > partp->dp_start) 1271 adj_size = prev_cyl_boundary - partp->dp_start; 1272 else { 1273 warnx( 1274 "ERROR: could not adjust partition to start on a head boundary\n\ 1275 and end on a cylinder boundary."); 1276 return (0); 1277 } 1278 if (adj_size != partp->dp_size) { 1279 warnx( 1280 "WARNING: adjusting size of partition %d from %u to %u\n\ 1281 to end on a cylinder boundary", 1282 partition, (u_int)partp->dp_size, (u_int)adj_size); 1283 partp->dp_size = adj_size; 1284 } 1285 if (partp->dp_size == 0) { 1286 warnx("ERROR line %d: size of partition %d is zero", 1287 current_line_number, partition); 1288 break; 1289 } 1290 1291 dos(partp); 1292 status = 1; 1293 break; 1294 } 1295 return (status); 1296 } 1297 1298 1299 static int 1300 process_active(CMD *command) 1301 { 1302 int status = 0, partition, i; 1303 struct dos_partition *partp; 1304 1305 while (1) { 1306 active_processed = 1; 1307 if (command->n_args != 1) { 1308 warnx("ERROR line %d: incorrect number of active args", 1309 current_line_number); 1310 status = 0; 1311 break; 1312 } 1313 partition = command->args[0].arg_val; 1314 if (partition < 1 || partition > 4) { 1315 warnx("ERROR line %d: invalid partition number %d", 1316 current_line_number, partition); 1317 break; 1318 } 1319 /* 1320 * Reset active partition 1321 */ 1322 partp = mboot.parts; 1323 for (i = 0; i < NDOSPART; i++) 1324 partp[i].dp_flag = 0; 1325 partp[partition-1].dp_flag = ACTIVE; 1326 1327 status = 1; 1328 break; 1329 } 1330 return (status); 1331 } 1332 1333 1334 static int 1335 process_line(char *line) 1336 { 1337 CMD command; 1338 int status = 1; 1339 1340 while (1) { 1341 parse_config_line(line, &command); 1342 switch (command.cmd) { 1343 case 0: 1344 /* 1345 * Comment or blank line 1346 */ 1347 break; 1348 case 'g': 1349 /* 1350 * Set geometry 1351 */ 1352 status = process_geometry(&command); 1353 break; 1354 case 'p': 1355 status = process_partition(&command); 1356 break; 1357 case 'a': 1358 status = process_active(&command); 1359 break; 1360 default: 1361 status = 0; 1362 break; 1363 } 1364 break; 1365 } 1366 return (status); 1367 } 1368 1369 1370 static int 1371 read_config(char *config_file) 1372 { 1373 FILE *fp = NULL; 1374 int status = 1; 1375 char buf[1010]; 1376 1377 while (1) { 1378 if (strcmp(config_file, "-") != 0) { 1379 /* 1380 * We're not reading from stdin 1381 */ 1382 if ((fp = fopen(config_file, "r")) == NULL) { 1383 status = 0; 1384 break; 1385 } 1386 } else { 1387 fp = stdin; 1388 } 1389 current_line_number = 0; 1390 while (!feof(fp)) { 1391 if (fgets(buf, sizeof(buf), fp) == NULL) 1392 break; 1393 ++current_line_number; 1394 status = process_line(buf); 1395 if (status == 0) 1396 break; 1397 } 1398 break; 1399 } 1400 if (fp) { 1401 /* 1402 * It doesn't matter if we're reading from stdin, as we've reached EOF 1403 */ 1404 fclose(fp); 1405 } 1406 return (status); 1407 } 1408 1409 1410 static void 1411 reset_boot(void) 1412 { 1413 int i; 1414 struct dos_partition *partp; 1415 1416 init_boot(); 1417 for (i = 0; i < 4; ++i) { 1418 partp = &mboot.parts[i]; 1419 bzero(partp, sizeof(*partp)); 1420 } 1421 } 1422 1423 static int 1424 sanitize_partition(struct dos_partition *partp) 1425 { 1426 u_int32_t prev_head_boundary, prev_cyl_boundary; 1427 u_int32_t max_end, size, start; 1428 1429 start = partp->dp_start; 1430 size = partp->dp_size; 1431 max_end = start + size; 1432 /* Only allow a zero size if the partition is being marked unused. */ 1433 if (size == 0) { 1434 if (start == 0 && partp->dp_typ == 0) 1435 return (1); 1436 warnx("ERROR: size of partition is zero"); 1437 return (0); 1438 } 1439 /* Return if no adjustment is necessary. */ 1440 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0) 1441 return (1); 1442 1443 if (start == 0) { 1444 warnx("WARNING: partition overlaps with partition table"); 1445 if (ok("Correct this automatically?")) 1446 start = dos_sectors; 1447 } 1448 if (start % dos_sectors != 0) 1449 warnx("WARNING: partition does not start on a head boundary"); 1450 if ((start +size) % dos_sectors != 0) 1451 warnx("WARNING: partition does not end on a cylinder boundary"); 1452 warnx("WARNING: this may confuse the BIOS or some operating systems"); 1453 if (!ok("Correct this automatically?")) 1454 return (1); 1455 1456 /* 1457 * Adjust start upwards, if necessary, to fall on a head boundary. 1458 */ 1459 if (start % dos_sectors != 0) { 1460 prev_head_boundary = start / dos_sectors * dos_sectors; 1461 if (max_end < dos_sectors || 1462 prev_head_boundary >= max_end - dos_sectors) { 1463 /* 1464 * Can't go past end of partition 1465 */ 1466 warnx( 1467 "ERROR: unable to adjust start of partition to fall on a head boundary"); 1468 return (0); 1469 } 1470 start = prev_head_boundary + dos_sectors; 1471 } 1472 1473 /* 1474 * Adjust size downwards, if necessary, to fall on a cylinder 1475 * boundary. 1476 */ 1477 prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs; 1478 if (prev_cyl_boundary > start) 1479 size = prev_cyl_boundary - start; 1480 else { 1481 warnx("ERROR: could not adjust partition to start on a head boundary\n\ 1482 and end on a cylinder boundary."); 1483 return (0); 1484 } 1485 1486 /* Finally, commit any changes to partp and return. */ 1487 if (start != partp->dp_start) { 1488 warnx("WARNING: adjusting start offset of partition to %u", 1489 (u_int)start); 1490 partp->dp_start = start; 1491 } 1492 if (size != partp->dp_size) { 1493 warnx("WARNING: adjusting size of partition to %u", (u_int)size); 1494 partp->dp_size = size; 1495 } 1496 1497 return (1); 1498 } 1499 1500 /* 1501 * Try figuring out the root device's canonical disk name. 1502 * The following choices are considered: 1503 * /dev/ad0s1a => /dev/ad0 1504 * /dev/da0a => /dev/da0 1505 * /dev/vinum/root => /dev/vinum/root 1506 * A ".eli" part is removed if it exists (see geli(8)). 1507 * A ".journal" ending is removed if it exists (see gjournal(8)). 1508 */ 1509 static char * 1510 get_rootdisk(void) 1511 { 1512 struct statfs rootfs; 1513 regex_t re; 1514 #define NMATCHES 2 1515 regmatch_t rm[NMATCHES]; 1516 char dev[PATH_MAX], *s; 1517 int rv; 1518 1519 if (statfs("/", &rootfs) == -1) 1520 err(1, "statfs(\"/\")"); 1521 1522 if ((rv = regcomp(&re, "^(/dev/[a-z/]+[0-9]*)([sp][0-9]+)?[a-h]?(\\.journal)?$", 1523 REG_EXTENDED)) != 0) 1524 errx(1, "regcomp() failed (%d)", rv); 1525 strlcpy(dev, rootfs.f_mntfromname, sizeof (dev)); 1526 if ((s = strstr(dev, ".eli")) != NULL) 1527 memmove(s, s+4, strlen(s + 4) + 1); 1528 1529 if ((rv = regexec(&re, dev, NMATCHES, rm, 0)) != 0) 1530 errx(1, 1531 "mounted root fs resource doesn't match expectations (regexec returned %d)", 1532 rv); 1533 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL) 1534 errx(1, "out of memory"); 1535 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so, 1536 rm[1].rm_eo - rm[1].rm_so); 1537 s[rm[1].rm_eo - rm[1].rm_so] = 0; 1538 1539 return s; 1540 } 1541